eaf1e20a |
1 | /* |
2 | * SSH backend. |
3 | */ |
4 | |
374330e2 |
5 | #include <stdio.h> |
6 | #include <stdlib.h> |
fb09bf1c |
7 | #include <stdarg.h> |
8 | #include <assert.h> |
3c112d53 |
9 | #include <limits.h> |
d051d1b4 |
10 | #include <signal.h> |
374330e2 |
11 | |
12 | #include "putty.h" |
dacbd0e8 |
13 | #include "tree234.h" |
fb09bf1c |
14 | #include "ssh.h" |
374330e2 |
15 | |
16 | #ifndef FALSE |
17 | #define FALSE 0 |
18 | #endif |
19 | #ifndef TRUE |
20 | #define TRUE 1 |
21 | #endif |
22 | |
32874aea |
23 | #define SSH1_MSG_DISCONNECT 1 /* 0x1 */ |
24 | #define SSH1_SMSG_PUBLIC_KEY 2 /* 0x2 */ |
25 | #define SSH1_CMSG_SESSION_KEY 3 /* 0x3 */ |
26 | #define SSH1_CMSG_USER 4 /* 0x4 */ |
27 | #define SSH1_CMSG_AUTH_RSA 6 /* 0x6 */ |
28 | #define SSH1_SMSG_AUTH_RSA_CHALLENGE 7 /* 0x7 */ |
29 | #define SSH1_CMSG_AUTH_RSA_RESPONSE 8 /* 0x8 */ |
30 | #define SSH1_CMSG_AUTH_PASSWORD 9 /* 0x9 */ |
31 | #define SSH1_CMSG_REQUEST_PTY 10 /* 0xa */ |
32 | #define SSH1_CMSG_WINDOW_SIZE 11 /* 0xb */ |
33 | #define SSH1_CMSG_EXEC_SHELL 12 /* 0xc */ |
34 | #define SSH1_CMSG_EXEC_CMD 13 /* 0xd */ |
35 | #define SSH1_SMSG_SUCCESS 14 /* 0xe */ |
36 | #define SSH1_SMSG_FAILURE 15 /* 0xf */ |
37 | #define SSH1_CMSG_STDIN_DATA 16 /* 0x10 */ |
38 | #define SSH1_SMSG_STDOUT_DATA 17 /* 0x11 */ |
39 | #define SSH1_SMSG_STDERR_DATA 18 /* 0x12 */ |
40 | #define SSH1_CMSG_EOF 19 /* 0x13 */ |
41 | #define SSH1_SMSG_EXIT_STATUS 20 /* 0x14 */ |
42 | #define SSH1_MSG_CHANNEL_OPEN_CONFIRMATION 21 /* 0x15 */ |
43 | #define SSH1_MSG_CHANNEL_OPEN_FAILURE 22 /* 0x16 */ |
44 | #define SSH1_MSG_CHANNEL_DATA 23 /* 0x17 */ |
45 | #define SSH1_MSG_CHANNEL_CLOSE 24 /* 0x18 */ |
46 | #define SSH1_MSG_CHANNEL_CLOSE_CONFIRMATION 25 /* 0x19 */ |
47 | #define SSH1_SMSG_X11_OPEN 27 /* 0x1b */ |
48 | #define SSH1_CMSG_PORT_FORWARD_REQUEST 28 /* 0x1c */ |
49 | #define SSH1_MSG_PORT_OPEN 29 /* 0x1d */ |
50 | #define SSH1_CMSG_AGENT_REQUEST_FORWARDING 30 /* 0x1e */ |
51 | #define SSH1_SMSG_AGENT_OPEN 31 /* 0x1f */ |
52 | #define SSH1_MSG_IGNORE 32 /* 0x20 */ |
53 | #define SSH1_CMSG_EXIT_CONFIRMATION 33 /* 0x21 */ |
54 | #define SSH1_CMSG_X11_REQUEST_FORWARDING 34 /* 0x22 */ |
55 | #define SSH1_CMSG_AUTH_RHOSTS_RSA 35 /* 0x23 */ |
56 | #define SSH1_MSG_DEBUG 36 /* 0x24 */ |
57 | #define SSH1_CMSG_REQUEST_COMPRESSION 37 /* 0x25 */ |
58 | #define SSH1_CMSG_AUTH_TIS 39 /* 0x27 */ |
59 | #define SSH1_SMSG_AUTH_TIS_CHALLENGE 40 /* 0x28 */ |
60 | #define SSH1_CMSG_AUTH_TIS_RESPONSE 41 /* 0x29 */ |
61 | #define SSH1_CMSG_AUTH_CCARD 70 /* 0x46 */ |
62 | #define SSH1_SMSG_AUTH_CCARD_CHALLENGE 71 /* 0x47 */ |
63 | #define SSH1_CMSG_AUTH_CCARD_RESPONSE 72 /* 0x48 */ |
64 | |
65 | #define SSH1_AUTH_TIS 5 /* 0x5 */ |
66 | #define SSH1_AUTH_CCARD 16 /* 0x10 */ |
67 | |
68 | #define SSH1_PROTOFLAG_SCREEN_NUMBER 1 /* 0x1 */ |
b96dc54c |
69 | /* Mask for protoflags we will echo back to server if seen */ |
32874aea |
70 | #define SSH1_PROTOFLAGS_SUPPORTED 0 /* 0x1 */ |
71 | |
72 | #define SSH2_MSG_DISCONNECT 1 /* 0x1 */ |
73 | #define SSH2_MSG_IGNORE 2 /* 0x2 */ |
74 | #define SSH2_MSG_UNIMPLEMENTED 3 /* 0x3 */ |
75 | #define SSH2_MSG_DEBUG 4 /* 0x4 */ |
76 | #define SSH2_MSG_SERVICE_REQUEST 5 /* 0x5 */ |
77 | #define SSH2_MSG_SERVICE_ACCEPT 6 /* 0x6 */ |
78 | #define SSH2_MSG_KEXINIT 20 /* 0x14 */ |
79 | #define SSH2_MSG_NEWKEYS 21 /* 0x15 */ |
80 | #define SSH2_MSG_KEXDH_INIT 30 /* 0x1e */ |
81 | #define SSH2_MSG_KEXDH_REPLY 31 /* 0x1f */ |
82 | #define SSH2_MSG_KEX_DH_GEX_REQUEST 30 /* 0x1e */ |
83 | #define SSH2_MSG_KEX_DH_GEX_GROUP 31 /* 0x1f */ |
84 | #define SSH2_MSG_KEX_DH_GEX_INIT 32 /* 0x20 */ |
85 | #define SSH2_MSG_KEX_DH_GEX_REPLY 33 /* 0x21 */ |
fae1a71b |
86 | #define SSH2_MSG_KEXRSA_PUBKEY 30 /* 0x1e */ |
87 | #define SSH2_MSG_KEXRSA_SECRET 31 /* 0x1f */ |
88 | #define SSH2_MSG_KEXRSA_DONE 32 /* 0x20 */ |
32874aea |
89 | #define SSH2_MSG_USERAUTH_REQUEST 50 /* 0x32 */ |
90 | #define SSH2_MSG_USERAUTH_FAILURE 51 /* 0x33 */ |
91 | #define SSH2_MSG_USERAUTH_SUCCESS 52 /* 0x34 */ |
92 | #define SSH2_MSG_USERAUTH_BANNER 53 /* 0x35 */ |
93 | #define SSH2_MSG_USERAUTH_PK_OK 60 /* 0x3c */ |
94 | #define SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ 60 /* 0x3c */ |
761187b6 |
95 | #define SSH2_MSG_USERAUTH_INFO_REQUEST 60 /* 0x3c */ |
96 | #define SSH2_MSG_USERAUTH_INFO_RESPONSE 61 /* 0x3d */ |
32874aea |
97 | #define SSH2_MSG_GLOBAL_REQUEST 80 /* 0x50 */ |
98 | #define SSH2_MSG_REQUEST_SUCCESS 81 /* 0x51 */ |
99 | #define SSH2_MSG_REQUEST_FAILURE 82 /* 0x52 */ |
100 | #define SSH2_MSG_CHANNEL_OPEN 90 /* 0x5a */ |
101 | #define SSH2_MSG_CHANNEL_OPEN_CONFIRMATION 91 /* 0x5b */ |
102 | #define SSH2_MSG_CHANNEL_OPEN_FAILURE 92 /* 0x5c */ |
103 | #define SSH2_MSG_CHANNEL_WINDOW_ADJUST 93 /* 0x5d */ |
104 | #define SSH2_MSG_CHANNEL_DATA 94 /* 0x5e */ |
105 | #define SSH2_MSG_CHANNEL_EXTENDED_DATA 95 /* 0x5f */ |
106 | #define SSH2_MSG_CHANNEL_EOF 96 /* 0x60 */ |
107 | #define SSH2_MSG_CHANNEL_CLOSE 97 /* 0x61 */ |
108 | #define SSH2_MSG_CHANNEL_REQUEST 98 /* 0x62 */ |
109 | #define SSH2_MSG_CHANNEL_SUCCESS 99 /* 0x63 */ |
110 | #define SSH2_MSG_CHANNEL_FAILURE 100 /* 0x64 */ |
111 | |
00db133f |
112 | /* |
113 | * Packet type contexts, so that ssh2_pkt_type can correctly decode |
114 | * the ambiguous type numbers back into the correct type strings. |
115 | */ |
d1aaf71d |
116 | #define SSH2_PKTCTX_DHGROUP 0x0001 |
00db133f |
117 | #define SSH2_PKTCTX_DHGEX 0x0002 |
fae1a71b |
118 | #define SSH2_PKTCTX_RSAKEX 0x0004 |
149d2abc |
119 | #define SSH2_PKTCTX_KEX_MASK 0x000F |
00db133f |
120 | #define SSH2_PKTCTX_PUBLICKEY 0x0010 |
121 | #define SSH2_PKTCTX_PASSWORD 0x0020 |
122 | #define SSH2_PKTCTX_KBDINTER 0x0040 |
123 | #define SSH2_PKTCTX_AUTH_MASK 0x00F0 |
124 | |
32874aea |
125 | #define SSH2_DISCONNECT_HOST_NOT_ALLOWED_TO_CONNECT 1 /* 0x1 */ |
126 | #define SSH2_DISCONNECT_PROTOCOL_ERROR 2 /* 0x2 */ |
127 | #define SSH2_DISCONNECT_KEY_EXCHANGE_FAILED 3 /* 0x3 */ |
128 | #define SSH2_DISCONNECT_HOST_AUTHENTICATION_FAILED 4 /* 0x4 */ |
129 | #define SSH2_DISCONNECT_MAC_ERROR 5 /* 0x5 */ |
130 | #define SSH2_DISCONNECT_COMPRESSION_ERROR 6 /* 0x6 */ |
131 | #define SSH2_DISCONNECT_SERVICE_NOT_AVAILABLE 7 /* 0x7 */ |
132 | #define SSH2_DISCONNECT_PROTOCOL_VERSION_NOT_SUPPORTED 8 /* 0x8 */ |
133 | #define SSH2_DISCONNECT_HOST_KEY_NOT_VERIFIABLE 9 /* 0x9 */ |
134 | #define SSH2_DISCONNECT_CONNECTION_LOST 10 /* 0xa */ |
135 | #define SSH2_DISCONNECT_BY_APPLICATION 11 /* 0xb */ |
136 | #define SSH2_DISCONNECT_TOO_MANY_CONNECTIONS 12 /* 0xc */ |
137 | #define SSH2_DISCONNECT_AUTH_CANCELLED_BY_USER 13 /* 0xd */ |
138 | #define SSH2_DISCONNECT_NO_MORE_AUTH_METHODS_AVAILABLE 14 /* 0xe */ |
139 | #define SSH2_DISCONNECT_ILLEGAL_USER_NAME 15 /* 0xf */ |
38c4a8da |
140 | |
141 | static const char *const ssh2_disconnect_reasons[] = { |
142 | NULL, |
afb4d0dc |
143 | "host not allowed to connect", |
144 | "protocol error", |
145 | "key exchange failed", |
146 | "host authentication failed", |
1da38d29 |
147 | "MAC error", |
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148 | "compression error", |
149 | "service not available", |
150 | "protocol version not supported", |
151 | "host key not verifiable", |
152 | "connection lost", |
153 | "by application", |
154 | "too many connections", |
155 | "auth cancelled by user", |
156 | "no more auth methods available", |
157 | "illegal user name", |
38c4a8da |
158 | }; |
9005f3ba |
159 | |
32874aea |
160 | #define SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED 1 /* 0x1 */ |
161 | #define SSH2_OPEN_CONNECT_FAILED 2 /* 0x2 */ |
162 | #define SSH2_OPEN_UNKNOWN_CHANNEL_TYPE 3 /* 0x3 */ |
163 | #define SSH2_OPEN_RESOURCE_SHORTAGE 4 /* 0x4 */ |
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164 | |
32874aea |
165 | #define SSH2_EXTENDED_DATA_STDERR 1 /* 0x1 */ |
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166 | |
7d503c31 |
167 | /* |
168 | * Various remote-bug flags. |
169 | */ |
170 | #define BUG_CHOKES_ON_SSH1_IGNORE 1 |
171 | #define BUG_SSH2_HMAC 2 |
bd358db1 |
172 | #define BUG_NEEDS_SSH1_PLAIN_PASSWORD 4 |
0df73905 |
173 | #define BUG_CHOKES_ON_RSA 8 |
1dd353b5 |
174 | #define BUG_SSH2_RSA_PADDING 16 |
088bde77 |
175 | #define BUG_SSH2_DERIVEKEY 32 |
f382c87d |
176 | #define BUG_SSH2_REKEY 64 |
dda87a28 |
177 | #define BUG_SSH2_PK_SESSIONID 128 |
bd358db1 |
178 | |
c6ccd5c2 |
179 | /* |
180 | * Codes for terminal modes. |
181 | * Most of these are the same in SSH-1 and SSH-2. |
182 | * This list is derived from draft-ietf-secsh-connect-25 and |
183 | * SSH-1 RFC-1.2.31. |
184 | */ |
185 | static const struct { |
186 | const char* const mode; |
187 | int opcode; |
188 | enum { TTY_OP_CHAR, TTY_OP_BOOL } type; |
189 | } ssh_ttymodes[] = { |
190 | /* "V" prefix discarded for special characters relative to SSH specs */ |
191 | { "INTR", 1, TTY_OP_CHAR }, |
192 | { "QUIT", 2, TTY_OP_CHAR }, |
193 | { "ERASE", 3, TTY_OP_CHAR }, |
194 | { "KILL", 4, TTY_OP_CHAR }, |
195 | { "EOF", 5, TTY_OP_CHAR }, |
196 | { "EOL", 6, TTY_OP_CHAR }, |
197 | { "EOL2", 7, TTY_OP_CHAR }, |
198 | { "START", 8, TTY_OP_CHAR }, |
199 | { "STOP", 9, TTY_OP_CHAR }, |
200 | { "SUSP", 10, TTY_OP_CHAR }, |
201 | { "DSUSP", 11, TTY_OP_CHAR }, |
202 | { "REPRINT", 12, TTY_OP_CHAR }, |
203 | { "WERASE", 13, TTY_OP_CHAR }, |
204 | { "LNEXT", 14, TTY_OP_CHAR }, |
205 | { "FLUSH", 15, TTY_OP_CHAR }, |
206 | { "SWTCH", 16, TTY_OP_CHAR }, |
207 | { "STATUS", 17, TTY_OP_CHAR }, |
208 | { "DISCARD", 18, TTY_OP_CHAR }, |
209 | { "IGNPAR", 30, TTY_OP_BOOL }, |
210 | { "PARMRK", 31, TTY_OP_BOOL }, |
211 | { "INPCK", 32, TTY_OP_BOOL }, |
212 | { "ISTRIP", 33, TTY_OP_BOOL }, |
213 | { "INLCR", 34, TTY_OP_BOOL }, |
214 | { "IGNCR", 35, TTY_OP_BOOL }, |
215 | { "ICRNL", 36, TTY_OP_BOOL }, |
216 | { "IUCLC", 37, TTY_OP_BOOL }, |
217 | { "IXON", 38, TTY_OP_BOOL }, |
218 | { "IXANY", 39, TTY_OP_BOOL }, |
219 | { "IXOFF", 40, TTY_OP_BOOL }, |
220 | { "IMAXBEL", 41, TTY_OP_BOOL }, |
221 | { "ISIG", 50, TTY_OP_BOOL }, |
222 | { "ICANON", 51, TTY_OP_BOOL }, |
223 | { "XCASE", 52, TTY_OP_BOOL }, |
224 | { "ECHO", 53, TTY_OP_BOOL }, |
225 | { "ECHOE", 54, TTY_OP_BOOL }, |
226 | { "ECHOK", 55, TTY_OP_BOOL }, |
227 | { "ECHONL", 56, TTY_OP_BOOL }, |
228 | { "NOFLSH", 57, TTY_OP_BOOL }, |
229 | { "TOSTOP", 58, TTY_OP_BOOL }, |
230 | { "IEXTEN", 59, TTY_OP_BOOL }, |
231 | { "ECHOCTL", 60, TTY_OP_BOOL }, |
232 | { "ECHOKE", 61, TTY_OP_BOOL }, |
233 | { "PENDIN", 62, TTY_OP_BOOL }, /* XXX is this a real mode? */ |
234 | { "OPOST", 70, TTY_OP_BOOL }, |
235 | { "OLCUC", 71, TTY_OP_BOOL }, |
236 | { "ONLCR", 72, TTY_OP_BOOL }, |
237 | { "OCRNL", 73, TTY_OP_BOOL }, |
238 | { "ONOCR", 74, TTY_OP_BOOL }, |
239 | { "ONLRET", 75, TTY_OP_BOOL }, |
240 | { "CS7", 90, TTY_OP_BOOL }, |
241 | { "CS8", 91, TTY_OP_BOOL }, |
242 | { "PARENB", 92, TTY_OP_BOOL }, |
243 | { "PARODD", 93, TTY_OP_BOOL } |
244 | }; |
245 | |
246 | /* Miscellaneous other tty-related constants. */ |
247 | #define SSH_TTY_OP_END 0 |
248 | /* The opcodes for ISPEED/OSPEED differ between SSH-1 and SSH-2. */ |
249 | #define SSH1_TTY_OP_ISPEED 192 |
250 | #define SSH1_TTY_OP_OSPEED 193 |
251 | #define SSH2_TTY_OP_ISPEED 128 |
252 | #define SSH2_TTY_OP_OSPEED 129 |
253 | |
254 | /* Helper functions for parsing tty-related config. */ |
255 | static unsigned int ssh_tty_parse_specchar(char *s) |
256 | { |
257 | unsigned int ret; |
258 | if (*s) { |
259 | char *next = NULL; |
260 | ret = ctrlparse(s, &next); |
261 | if (!next) ret = s[0]; |
262 | } else { |
263 | ret = 255; /* special value meaning "don't set" */ |
264 | } |
265 | return ret; |
266 | } |
267 | static unsigned int ssh_tty_parse_boolean(char *s) |
268 | { |
269 | if (stricmp(s, "yes") == 0 || |
270 | stricmp(s, "on") == 0 || |
271 | stricmp(s, "true") == 0 || |
272 | stricmp(s, "+") == 0) |
273 | return 1; /* true */ |
274 | else if (stricmp(s, "no") == 0 || |
275 | stricmp(s, "off") == 0 || |
276 | stricmp(s, "false") == 0 || |
277 | stricmp(s, "-") == 0) |
278 | return 0; /* false */ |
279 | else |
280 | return (atoi(s) != 0); |
281 | } |
282 | |
00db133f |
283 | #define translate(x) if (type == x) return #x |
51470298 |
284 | #define translatec(x,ctx) if (type == x && (pkt_ctx & ctx)) return #x |
ae9ae89f |
285 | static char *ssh1_pkt_type(int type) |
00db133f |
286 | { |
287 | translate(SSH1_MSG_DISCONNECT); |
288 | translate(SSH1_SMSG_PUBLIC_KEY); |
289 | translate(SSH1_CMSG_SESSION_KEY); |
290 | translate(SSH1_CMSG_USER); |
291 | translate(SSH1_CMSG_AUTH_RSA); |
292 | translate(SSH1_SMSG_AUTH_RSA_CHALLENGE); |
293 | translate(SSH1_CMSG_AUTH_RSA_RESPONSE); |
294 | translate(SSH1_CMSG_AUTH_PASSWORD); |
295 | translate(SSH1_CMSG_REQUEST_PTY); |
296 | translate(SSH1_CMSG_WINDOW_SIZE); |
297 | translate(SSH1_CMSG_EXEC_SHELL); |
298 | translate(SSH1_CMSG_EXEC_CMD); |
299 | translate(SSH1_SMSG_SUCCESS); |
300 | translate(SSH1_SMSG_FAILURE); |
301 | translate(SSH1_CMSG_STDIN_DATA); |
302 | translate(SSH1_SMSG_STDOUT_DATA); |
303 | translate(SSH1_SMSG_STDERR_DATA); |
304 | translate(SSH1_CMSG_EOF); |
305 | translate(SSH1_SMSG_EXIT_STATUS); |
306 | translate(SSH1_MSG_CHANNEL_OPEN_CONFIRMATION); |
307 | translate(SSH1_MSG_CHANNEL_OPEN_FAILURE); |
308 | translate(SSH1_MSG_CHANNEL_DATA); |
309 | translate(SSH1_MSG_CHANNEL_CLOSE); |
310 | translate(SSH1_MSG_CHANNEL_CLOSE_CONFIRMATION); |
311 | translate(SSH1_SMSG_X11_OPEN); |
312 | translate(SSH1_CMSG_PORT_FORWARD_REQUEST); |
313 | translate(SSH1_MSG_PORT_OPEN); |
314 | translate(SSH1_CMSG_AGENT_REQUEST_FORWARDING); |
315 | translate(SSH1_SMSG_AGENT_OPEN); |
316 | translate(SSH1_MSG_IGNORE); |
317 | translate(SSH1_CMSG_EXIT_CONFIRMATION); |
318 | translate(SSH1_CMSG_X11_REQUEST_FORWARDING); |
319 | translate(SSH1_CMSG_AUTH_RHOSTS_RSA); |
320 | translate(SSH1_MSG_DEBUG); |
321 | translate(SSH1_CMSG_REQUEST_COMPRESSION); |
322 | translate(SSH1_CMSG_AUTH_TIS); |
323 | translate(SSH1_SMSG_AUTH_TIS_CHALLENGE); |
324 | translate(SSH1_CMSG_AUTH_TIS_RESPONSE); |
325 | translate(SSH1_CMSG_AUTH_CCARD); |
326 | translate(SSH1_SMSG_AUTH_CCARD_CHALLENGE); |
327 | translate(SSH1_CMSG_AUTH_CCARD_RESPONSE); |
328 | return "unknown"; |
329 | } |
ae9ae89f |
330 | static char *ssh2_pkt_type(int pkt_ctx, int type) |
00db133f |
331 | { |
332 | translate(SSH2_MSG_DISCONNECT); |
333 | translate(SSH2_MSG_IGNORE); |
334 | translate(SSH2_MSG_UNIMPLEMENTED); |
335 | translate(SSH2_MSG_DEBUG); |
336 | translate(SSH2_MSG_SERVICE_REQUEST); |
337 | translate(SSH2_MSG_SERVICE_ACCEPT); |
338 | translate(SSH2_MSG_KEXINIT); |
339 | translate(SSH2_MSG_NEWKEYS); |
d1aaf71d |
340 | translatec(SSH2_MSG_KEXDH_INIT, SSH2_PKTCTX_DHGROUP); |
341 | translatec(SSH2_MSG_KEXDH_REPLY, SSH2_PKTCTX_DHGROUP); |
00db133f |
342 | translatec(SSH2_MSG_KEX_DH_GEX_REQUEST, SSH2_PKTCTX_DHGEX); |
343 | translatec(SSH2_MSG_KEX_DH_GEX_GROUP, SSH2_PKTCTX_DHGEX); |
344 | translatec(SSH2_MSG_KEX_DH_GEX_INIT, SSH2_PKTCTX_DHGEX); |
345 | translatec(SSH2_MSG_KEX_DH_GEX_REPLY, SSH2_PKTCTX_DHGEX); |
fae1a71b |
346 | translatec(SSH2_MSG_KEXRSA_PUBKEY, SSH2_PKTCTX_RSAKEX); |
347 | translatec(SSH2_MSG_KEXRSA_SECRET, SSH2_PKTCTX_RSAKEX); |
348 | translatec(SSH2_MSG_KEXRSA_DONE, SSH2_PKTCTX_RSAKEX); |
00db133f |
349 | translate(SSH2_MSG_USERAUTH_REQUEST); |
350 | translate(SSH2_MSG_USERAUTH_FAILURE); |
351 | translate(SSH2_MSG_USERAUTH_SUCCESS); |
352 | translate(SSH2_MSG_USERAUTH_BANNER); |
353 | translatec(SSH2_MSG_USERAUTH_PK_OK, SSH2_PKTCTX_PUBLICKEY); |
354 | translatec(SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ, SSH2_PKTCTX_PASSWORD); |
355 | translatec(SSH2_MSG_USERAUTH_INFO_REQUEST, SSH2_PKTCTX_KBDINTER); |
356 | translatec(SSH2_MSG_USERAUTH_INFO_RESPONSE, SSH2_PKTCTX_KBDINTER); |
357 | translate(SSH2_MSG_GLOBAL_REQUEST); |
358 | translate(SSH2_MSG_REQUEST_SUCCESS); |
359 | translate(SSH2_MSG_REQUEST_FAILURE); |
360 | translate(SSH2_MSG_CHANNEL_OPEN); |
361 | translate(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); |
362 | translate(SSH2_MSG_CHANNEL_OPEN_FAILURE); |
363 | translate(SSH2_MSG_CHANNEL_WINDOW_ADJUST); |
364 | translate(SSH2_MSG_CHANNEL_DATA); |
365 | translate(SSH2_MSG_CHANNEL_EXTENDED_DATA); |
366 | translate(SSH2_MSG_CHANNEL_EOF); |
367 | translate(SSH2_MSG_CHANNEL_CLOSE); |
368 | translate(SSH2_MSG_CHANNEL_REQUEST); |
369 | translate(SSH2_MSG_CHANNEL_SUCCESS); |
370 | translate(SSH2_MSG_CHANNEL_FAILURE); |
371 | return "unknown"; |
372 | } |
373 | #undef translate |
374 | #undef translatec |
7d503c31 |
375 | |
9a10ecf4 |
376 | /* Enumeration values for fields in SSH-1 packets */ |
377 | enum { |
378 | PKT_END, PKT_INT, PKT_CHAR, PKT_DATA, PKT_STR, PKT_BIGNUM, |
379 | /* These values are for communicating relevant semantics of |
380 | * fields to the packet logging code. */ |
381 | PKTT_OTHER, PKTT_PASSWORD, PKTT_DATA |
382 | }; |
972a41c8 |
383 | |
acddebd9 |
384 | /* |
385 | * Coroutine mechanics for the sillier bits of the code. If these |
386 | * macros look impenetrable to you, you might find it helpful to |
387 | * read |
388 | * |
389 | * http://www.chiark.greenend.org.uk/~sgtatham/coroutines.html |
390 | * |
391 | * which explains the theory behind these macros. |
b624d1e6 |
392 | * |
393 | * In particular, if you are getting `case expression not constant' |
394 | * errors when building with MS Visual Studio, this is because MS's |
395 | * Edit and Continue debugging feature causes their compiler to |
396 | * violate ANSI C. To disable Edit and Continue debugging: |
397 | * |
398 | * - right-click ssh.c in the FileView |
399 | * - click Settings |
400 | * - select the C/C++ tab and the General category |
401 | * - under `Debug info:', select anything _other_ than `Program |
402 | * Database for Edit and Continue'. |
acddebd9 |
403 | */ |
51470298 |
404 | #define crBegin(v) { int *crLine = &v; switch(v) { case 0:; |
405 | #define crState(t) \ |
406 | struct t *s; \ |
3d88e64d |
407 | if (!ssh->t) ssh->t = snew(struct t); \ |
51470298 |
408 | s = ssh->t; |
409 | #define crFinish(z) } *crLine = 0; return (z); } |
410 | #define crFinishV } *crLine = 0; return; } |
374330e2 |
411 | #define crReturn(z) \ |
412 | do {\ |
51470298 |
413 | *crLine =__LINE__; return (z); case __LINE__:;\ |
374330e2 |
414 | } while (0) |
415 | #define crReturnV \ |
416 | do {\ |
51470298 |
417 | *crLine=__LINE__; return; case __LINE__:;\ |
374330e2 |
418 | } while (0) |
51470298 |
419 | #define crStop(z) do{ *crLine = 0; return (z); }while(0) |
420 | #define crStopV do{ *crLine = 0; return; }while(0) |
fb09bf1c |
421 | #define crWaitUntil(c) do { crReturn(0); } while (!(c)) |
7cca0d81 |
422 | #define crWaitUntilV(c) do { crReturnV; } while (!(c)) |
374330e2 |
423 | |
51470298 |
424 | typedef struct ssh_tag *Ssh; |
ff3187f6 |
425 | struct Packet; |
426 | |
dacd8872 |
427 | static struct Packet *ssh1_pkt_init(int pkt_type); |
ff3187f6 |
428 | static struct Packet *ssh2_pkt_init(int pkt_type); |
dacd8872 |
429 | static void ssh_pkt_ensure(struct Packet *, int length); |
430 | static void ssh_pkt_adddata(struct Packet *, void *data, int len); |
431 | static void ssh_pkt_addbyte(struct Packet *, unsigned char value); |
ff3187f6 |
432 | static void ssh2_pkt_addbool(struct Packet *, unsigned char value); |
dacd8872 |
433 | static void ssh_pkt_adduint32(struct Packet *, unsigned long value); |
434 | static void ssh_pkt_addstring_start(struct Packet *); |
435 | static void ssh_pkt_addstring_str(struct Packet *, char *data); |
436 | static void ssh_pkt_addstring_data(struct Packet *, char *data, int len); |
437 | static void ssh_pkt_addstring(struct Packet *, char *data); |
d8baa528 |
438 | static unsigned char *ssh2_mpint_fmt(Bignum b, int *len); |
dacd8872 |
439 | static void ssh1_pkt_addmp(struct Packet *, Bignum b); |
ff3187f6 |
440 | static void ssh2_pkt_addmp(struct Packet *, Bignum b); |
441 | static int ssh2_pkt_construct(Ssh, struct Packet *); |
442 | static void ssh2_pkt_send(Ssh, struct Packet *); |
590f6a5f |
443 | static void ssh2_pkt_send_noqueue(Ssh, struct Packet *); |
ff3187f6 |
444 | static int do_ssh1_login(Ssh ssh, unsigned char *in, int inlen, |
445 | struct Packet *pktin); |
446 | static void do_ssh2_authconn(Ssh ssh, unsigned char *in, int inlen, |
447 | struct Packet *pktin); |
3d63ca2e |
448 | |
5471d09a |
449 | /* |
450 | * Buffer management constants. There are several of these for |
451 | * various different purposes: |
452 | * |
453 | * - SSH1_BUFFER_LIMIT is the amount of backlog that must build up |
454 | * on a local data stream before we throttle the whole SSH |
2e85c969 |
455 | * connection (in SSH-1 only). Throttling the whole connection is |
5471d09a |
456 | * pretty drastic so we set this high in the hope it won't |
457 | * happen very often. |
458 | * |
459 | * - SSH_MAX_BACKLOG is the amount of backlog that must build up |
460 | * on the SSH connection itself before we defensively throttle |
461 | * _all_ local data streams. This is pretty drastic too (though |
2e85c969 |
462 | * thankfully unlikely in SSH-2 since the window mechanism should |
5471d09a |
463 | * ensure that the server never has any need to throttle its end |
464 | * of the connection), so we set this high as well. |
465 | * |
2e85c969 |
466 | * - OUR_V2_WINSIZE is the maximum window size we present on SSH-2 |
5471d09a |
467 | * channels. |
468 | */ |
469 | |
470 | #define SSH1_BUFFER_LIMIT 32768 |
471 | #define SSH_MAX_BACKLOG 32768 |
472 | #define OUR_V2_WINSIZE 16384 |
954d5c5a |
473 | #define OUR_V2_MAXPKT 0x4000UL |
d74d141c |
474 | |
edd0cb8a |
475 | /* Maximum length of passwords/passphrases (arbitrary) */ |
476 | #define SSH_MAX_PASSWORD_LEN 100 |
477 | |
85cc02bb |
478 | const static struct ssh_signkey *hostkey_algs[] = { &ssh_rsa, &ssh_dss }; |
e5574168 |
479 | |
8b2715b2 |
480 | const static struct ssh_mac *macs[] = { |
6668a75e |
481 | &ssh_hmac_sha1, &ssh_hmac_sha1_96, &ssh_hmac_md5 |
32874aea |
482 | }; |
8b2715b2 |
483 | const static struct ssh_mac *buggymacs[] = { |
6668a75e |
484 | &ssh_hmac_sha1_buggy, &ssh_hmac_sha1_96_buggy, &ssh_hmac_md5 |
32874aea |
485 | }; |
e5574168 |
486 | |
5366aed8 |
487 | static void *ssh_comp_none_init(void) |
488 | { |
489 | return NULL; |
490 | } |
491 | static void ssh_comp_none_cleanup(void *handle) |
32874aea |
492 | { |
493 | } |
5366aed8 |
494 | static int ssh_comp_none_block(void *handle, unsigned char *block, int len, |
32874aea |
495 | unsigned char **outblock, int *outlen) |
496 | { |
497 | return 0; |
498 | } |
5366aed8 |
499 | static int ssh_comp_none_disable(void *handle) |
32874aea |
500 | { |
4ba9b64b |
501 | return 0; |
502 | } |
57476f6b |
503 | const static struct ssh_compress ssh_comp_none = { |
4ba9b64b |
504 | "none", |
5366aed8 |
505 | ssh_comp_none_init, ssh_comp_none_cleanup, ssh_comp_none_block, |
506 | ssh_comp_none_init, ssh_comp_none_cleanup, ssh_comp_none_block, |
507 | ssh_comp_none_disable, NULL |
e5574168 |
508 | }; |
4ba9b64b |
509 | extern const struct ssh_compress ssh_zlib; |
510 | const static struct ssh_compress *compressions[] = { |
32874aea |
511 | &ssh_zlib, &ssh_comp_none |
512 | }; |
374330e2 |
513 | |
32874aea |
514 | enum { /* channel types */ |
783415f8 |
515 | CHAN_MAINSESSION, |
516 | CHAN_X11, |
517 | CHAN_AGENT, |
bc240b21 |
518 | CHAN_SOCKDATA, |
519 | CHAN_SOCKDATA_DORMANT /* one the remote hasn't confirmed */ |
783415f8 |
520 | }; |
521 | |
dacbd0e8 |
522 | /* |
523 | * 2-3-4 tree storing channels. |
524 | */ |
525 | struct ssh_channel { |
51470298 |
526 | Ssh ssh; /* pointer back to main context */ |
d211621f |
527 | unsigned remoteid, localid; |
dacbd0e8 |
528 | int type; |
64d6ff88 |
529 | /* True if we opened this channel but server hasn't confirmed. */ |
530 | int halfopen; |
0357890f |
531 | /* |
2e85c969 |
532 | * In SSH-1, this value contains four bits: |
0357890f |
533 | * |
534 | * 1 We have sent SSH1_MSG_CHANNEL_CLOSE. |
535 | * 2 We have sent SSH1_MSG_CHANNEL_CLOSE_CONFIRMATION. |
536 | * 4 We have received SSH1_MSG_CHANNEL_CLOSE. |
537 | * 8 We have received SSH1_MSG_CHANNEL_CLOSE_CONFIRMATION. |
538 | * |
539 | * A channel is completely finished with when all four bits are set. |
540 | */ |
dacbd0e8 |
541 | int closes; |
5471d09a |
542 | union { |
543 | struct ssh1_data_channel { |
544 | int throttling; |
545 | } v1; |
546 | struct ssh2_data_channel { |
547 | bufchain outbuffer; |
548 | unsigned remwindow, remmaxpkt; |
549 | unsigned locwindow; |
550 | } v2; |
551 | } v; |
dacbd0e8 |
552 | union { |
32874aea |
553 | struct ssh_agent_channel { |
554 | unsigned char *message; |
555 | unsigned char msglen[4]; |
a03c9f9c |
556 | unsigned lensofar, totallen; |
32874aea |
557 | } a; |
558 | struct ssh_x11_channel { |
559 | Socket s; |
560 | } x11; |
d74d141c |
561 | struct ssh_pfd_channel { |
562 | Socket s; |
563 | } pfd; |
dacbd0e8 |
564 | } u; |
565 | }; |
57476f6b |
566 | |
d74d141c |
567 | /* |
2e85c969 |
568 | * 2-3-4 tree storing remote->local port forwardings. SSH-1 and SSH-2 |
569 | * use this structure in different ways, reflecting SSH-2's |
bc240b21 |
570 | * altogether saner approach to port forwarding. |
571 | * |
2e85c969 |
572 | * In SSH-1, you arrange a remote forwarding by sending the server |
bc240b21 |
573 | * the remote port number, and the local destination host:port. |
574 | * When a connection comes in, the server sends you back that |
575 | * host:port pair, and you connect to it. This is a ready-made |
576 | * security hole if you're not on the ball: a malicious server |
577 | * could send you back _any_ host:port pair, so if you trustingly |
578 | * connect to the address it gives you then you've just opened the |
579 | * entire inside of your corporate network just by connecting |
580 | * through it to a dodgy SSH server. Hence, we must store a list of |
581 | * host:port pairs we _are_ trying to forward to, and reject a |
582 | * connection request from the server if it's not in the list. |
583 | * |
2e85c969 |
584 | * In SSH-2, each side of the connection minds its own business and |
bc240b21 |
585 | * doesn't send unnecessary information to the other. You arrange a |
586 | * remote forwarding by sending the server just the remote port |
587 | * number. When a connection comes in, the server tells you which |
588 | * of its ports was connected to; and _you_ have to remember what |
589 | * local host:port pair went with that port number. |
590 | * |
2e85c969 |
591 | * Hence, in SSH-1 this structure is indexed by destination |
592 | * host:port pair, whereas in SSH-2 it is indexed by source port. |
d74d141c |
593 | */ |
fda2feb1 |
594 | struct ssh_portfwd; /* forward declaration */ |
595 | |
d74d141c |
596 | struct ssh_rportfwd { |
bc240b21 |
597 | unsigned sport, dport; |
598 | char dhost[256]; |
06fadff5 |
599 | char *sportdesc; |
fda2feb1 |
600 | struct ssh_portfwd *pfrec; |
d74d141c |
601 | }; |
fda2feb1 |
602 | #define free_rportfwd(pf) ( \ |
603 | ((pf) ? (sfree((pf)->sportdesc)) : (void)0 ), sfree(pf) ) |
604 | |
605 | /* |
606 | * Separately to the rportfwd tree (which is for looking up port |
607 | * open requests from the server), a tree of _these_ structures is |
608 | * used to keep track of all the currently open port forwardings, |
609 | * so that we can reconfigure in mid-session if the user requests |
610 | * it. |
611 | */ |
612 | struct ssh_portfwd { |
84328ddb |
613 | enum { DESTROY, KEEP, CREATE } status; |
fda2feb1 |
614 | int type; |
615 | unsigned sport, dport; |
616 | char *saddr, *daddr; |
3fe92132 |
617 | char *sserv, *dserv; |
fda2feb1 |
618 | struct ssh_rportfwd *remote; |
05581745 |
619 | int addressfamily; |
fda2feb1 |
620 | void *local; |
621 | }; |
622 | #define free_portfwd(pf) ( \ |
3fe92132 |
623 | ((pf) ? (sfree((pf)->saddr), sfree((pf)->daddr), \ |
624 | sfree((pf)->sserv), sfree((pf)->dserv)) : (void)0 ), sfree(pf) ) |
d74d141c |
625 | |
57476f6b |
626 | struct Packet { |
dacd8872 |
627 | long length; /* length of `data' actually used */ |
628 | long forcepad; /* SSH-2: force padding to at least this length */ |
629 | int type; /* only used for incoming packets */ |
630 | unsigned long sequence; /* SSH-2 incoming sequence number */ |
631 | unsigned char *data; /* allocated storage */ |
632 | unsigned char *body; /* offset of payload within `data' */ |
633 | long savedpos; /* temporary index into `data' (for strings) */ |
634 | long maxlen; /* amount of storage allocated for `data' */ |
635 | long encrypted_len; /* for SSH-2 total-size counting */ |
ff3187f6 |
636 | |
637 | /* |
638 | * State associated with packet logging |
639 | */ |
640 | int logmode; |
641 | int nblanks; |
642 | struct logblank_t *blanks; |
57476f6b |
643 | }; |
644 | |
1c1a7262 |
645 | static void ssh1_protocol(Ssh ssh, void *vin, int inlen, |
ff3187f6 |
646 | struct Packet *pktin); |
1c1a7262 |
647 | static void ssh2_protocol(Ssh ssh, void *vin, int inlen, |
ff3187f6 |
648 | struct Packet *pktin); |
b09eaa88 |
649 | static void ssh1_protocol_setup(Ssh ssh); |
650 | static void ssh2_protocol_setup(Ssh ssh); |
51470298 |
651 | static void ssh_size(void *handle, int width, int height); |
652 | static void ssh_special(void *handle, Telnet_Special); |
5471d09a |
653 | static int ssh2_try_send(struct ssh_channel *c); |
51470298 |
654 | static void ssh2_add_channel_data(struct ssh_channel *c, char *buf, int len); |
655 | static void ssh_throttle_all(Ssh ssh, int enable, int bufsize); |
5471d09a |
656 | static void ssh2_set_window(struct ssh_channel *c, unsigned newwin); |
51470298 |
657 | static int ssh_sendbuffer(void *handle); |
ac934965 |
658 | static int ssh_do_close(Ssh ssh, int notify_exit); |
ff3187f6 |
659 | static unsigned long ssh_pkt_getuint32(struct Packet *pkt); |
660 | static int ssh2_pkt_getbool(struct Packet *pkt); |
661 | static void ssh_pkt_getstring(struct Packet *pkt, char **p, int *length); |
9442dd57 |
662 | static void ssh2_timer(void *ctx, long now); |
1c1a7262 |
663 | static int do_ssh2_transport(Ssh ssh, void *vin, int inlen, |
9442dd57 |
664 | struct Packet *pktin); |
57476f6b |
665 | |
51470298 |
666 | struct rdpkt1_state_tag { |
57476f6b |
667 | long len, pad, biglen, to_read; |
668 | unsigned long realcrc, gotcrc; |
669 | unsigned char *p; |
670 | int i; |
671 | int chunk; |
ff3187f6 |
672 | struct Packet *pktin; |
51470298 |
673 | }; |
57476f6b |
674 | |
51470298 |
675 | struct rdpkt2_state_tag { |
960e736a |
676 | long len, pad, payload, packetlen, maclen; |
677 | int i; |
678 | int cipherblk; |
679 | unsigned long incoming_sequence; |
ff3187f6 |
680 | struct Packet *pktin; |
51470298 |
681 | }; |
682 | |
b09eaa88 |
683 | typedef void (*handler_fn_t)(Ssh ssh, struct Packet *pktin); |
06fadff5 |
684 | typedef void (*chandler_fn_t)(Ssh ssh, struct Packet *pktin, void *ctx); |
685 | |
686 | struct queued_handler; |
687 | struct queued_handler { |
688 | int msg1, msg2; |
689 | chandler_fn_t handler; |
690 | void *ctx; |
691 | struct queued_handler *next; |
692 | }; |
b09eaa88 |
693 | |
51470298 |
694 | struct ssh_tag { |
695 | const struct plug_function_table *fn; |
696 | /* the above field _must_ be first in the structure */ |
697 | |
4320baf7 |
698 | char *v_c, *v_s; |
b672f405 |
699 | void *exhash; |
51470298 |
700 | |
701 | Socket s; |
702 | |
b9d7bcad |
703 | void *ldisc; |
a8327734 |
704 | void *logctx; |
b9d7bcad |
705 | |
51470298 |
706 | unsigned char session_key[32]; |
707 | int v1_compressing; |
708 | int v1_remote_protoflags; |
709 | int v1_local_protoflags; |
710 | int agentfwd_enabled; |
711 | int X11_fwd_enabled; |
712 | int remote_bugs; |
713 | const struct ssh_cipher *cipher; |
371e569c |
714 | void *v1_cipher_ctx; |
0183b242 |
715 | void *crcda_ctx; |
51470298 |
716 | const struct ssh2_cipher *cscipher, *sccipher; |
371e569c |
717 | void *cs_cipher_ctx, *sc_cipher_ctx; |
51470298 |
718 | const struct ssh_mac *csmac, *scmac; |
e0e1a00d |
719 | void *cs_mac_ctx, *sc_mac_ctx; |
51470298 |
720 | const struct ssh_compress *cscomp, *sccomp; |
5366aed8 |
721 | void *cs_comp_ctx, *sc_comp_ctx; |
51470298 |
722 | const struct ssh_kex *kex; |
723 | const struct ssh_signkey *hostkey; |
754c0df9 |
724 | unsigned char v2_session_id[SSH2_KEX_MAX_HASH_LEN]; |
b672f405 |
725 | int v2_session_id_len; |
27cd7fc2 |
726 | void *kex_ctx; |
51470298 |
727 | |
728 | char *savedhost; |
729 | int savedport; |
730 | int send_ok; |
731 | int echoing, editing; |
732 | |
733 | void *frontend; |
734 | |
db219738 |
735 | int ospeed, ispeed; /* temporaries */ |
51470298 |
736 | int term_width, term_height; |
737 | |
738 | tree234 *channels; /* indexed by local id */ |
739 | struct ssh_channel *mainchan; /* primary session channel */ |
feb02b4e |
740 | int ncmode; /* is primary channel direct-tcpip? */ |
51470298 |
741 | int exitcode; |
ac934965 |
742 | int close_expected; |
9e296bfa |
743 | int clean_exit; |
51470298 |
744 | |
fda2feb1 |
745 | tree234 *rportfwds, *portfwds; |
51470298 |
746 | |
747 | enum { |
748 | SSH_STATE_PREPACKET, |
749 | SSH_STATE_BEFORE_SIZE, |
750 | SSH_STATE_INTERMED, |
751 | SSH_STATE_SESSION, |
752 | SSH_STATE_CLOSED |
753 | } state; |
754 | |
755 | int size_needed, eof_needed; |
756 | |
590f6a5f |
757 | struct Packet **queue; |
758 | int queuelen, queuesize; |
759 | int queueing; |
51470298 |
760 | unsigned char *deferred_send_data; |
761 | int deferred_len, deferred_size; |
762 | |
763 | /* |
764 | * Gross hack: pscp will try to start SFTP but fall back to |
765 | * scp1 if that fails. This variable is the means by which |
766 | * scp.c can reach into the SSH code and find out which one it |
767 | * got. |
768 | */ |
769 | int fallback_cmd; |
770 | |
6bbce591 |
771 | bufchain banner; /* accumulates banners during do_ssh2_authconn */ |
51470298 |
772 | |
51470298 |
773 | int pkt_ctx; |
774 | |
302121de |
775 | void *x11auth; |
776 | |
51470298 |
777 | int version; |
778 | int v1_throttle_count; |
779 | int overall_bufsize; |
780 | int throttled_all; |
781 | int v1_stdout_throttling; |
a8756193 |
782 | unsigned long v2_outgoing_sequence; |
51470298 |
783 | |
784 | int ssh1_rdpkt_crstate; |
785 | int ssh2_rdpkt_crstate; |
786 | int do_ssh_init_crstate; |
787 | int ssh_gotdata_crstate; |
51470298 |
788 | int do_ssh1_login_crstate; |
b09eaa88 |
789 | int do_ssh1_connection_crstate; |
51470298 |
790 | int do_ssh2_transport_crstate; |
791 | int do_ssh2_authconn_crstate; |
792 | |
793 | void *do_ssh_init_state; |
794 | void *do_ssh1_login_state; |
795 | void *do_ssh2_transport_state; |
796 | void *do_ssh2_authconn_state; |
797 | |
798 | struct rdpkt1_state_tag rdpkt1_state; |
799 | struct rdpkt2_state_tag rdpkt2_state; |
800 | |
2e85c969 |
801 | /* SSH-1 and SSH-2 use this for different things, but both use it */ |
b09eaa88 |
802 | int protocol_initial_phase_done; |
803 | |
1c1a7262 |
804 | void (*protocol) (Ssh ssh, void *vin, int inlen, |
ff3187f6 |
805 | struct Packet *pkt); |
806 | struct Packet *(*s_rdpkt) (Ssh ssh, unsigned char **data, int *datalen); |
86916870 |
807 | |
808 | /* |
809 | * We maintain a full _copy_ of a Config structure here, not |
810 | * merely a pointer to it. That way, when we're passed a new |
811 | * one for reconfiguration, we can check the differences and |
812 | * potentially reconfigure port forwardings etc in mid-session. |
813 | */ |
814 | Config cfg; |
839f10db |
815 | |
816 | /* |
3d9449a1 |
817 | * Used to transfer data back from async callbacks. |
839f10db |
818 | */ |
819 | void *agent_response; |
820 | int agent_response_len; |
3d9449a1 |
821 | int user_response; |
822 | |
823 | /* |
824 | * The SSH connection can be set as `frozen', meaning we are |
825 | * not currently accepting incoming data from the network. This |
826 | * is slightly more serious than setting the _socket_ as |
827 | * frozen, because we may already have had data passed to us |
828 | * from the network which we need to delay processing until |
829 | * after the freeze is lifted, so we also need a bufchain to |
830 | * store that data. |
831 | */ |
832 | int frozen; |
833 | bufchain queued_incoming_data; |
b09eaa88 |
834 | |
835 | /* |
836 | * Dispatch table for packet types that we may have to deal |
837 | * with at any time. |
838 | */ |
839 | handler_fn_t packet_dispatch[256]; |
39934deb |
840 | |
841 | /* |
06fadff5 |
842 | * Queues of one-off handler functions for success/failure |
843 | * indications from a request. |
844 | */ |
845 | struct queued_handler *qhead, *qtail; |
846 | |
847 | /* |
39934deb |
848 | * This module deals with sending keepalives. |
849 | */ |
850 | Pinger pinger; |
9442dd57 |
851 | |
852 | /* |
853 | * Track incoming and outgoing data sizes and time, for |
854 | * size-based rekeys. |
855 | */ |
856 | unsigned long incoming_data_size, outgoing_data_size, deferred_data_size; |
d57f70af |
857 | unsigned long max_data_size; |
9442dd57 |
858 | int kex_in_progress; |
e6c1536e |
859 | long next_rekey, last_rekey; |
e13bba36 |
860 | char *deferred_rekey_reason; /* points to STATIC string; don't free */ |
51470298 |
861 | }; |
960e736a |
862 | |
382908ad |
863 | #define logevent(s) logevent(ssh->frontend, s) |
a8327734 |
864 | |
865 | /* logevent, only printf-formatted. */ |
cbe2d68f |
866 | static void logeventf(Ssh ssh, const char *fmt, ...) |
a8327734 |
867 | { |
868 | va_list ap; |
57356d63 |
869 | char *buf; |
a8327734 |
870 | |
871 | va_start(ap, fmt); |
57356d63 |
872 | buf = dupvprintf(fmt, ap); |
a8327734 |
873 | va_end(ap); |
57356d63 |
874 | logevent(buf); |
57356d63 |
875 | sfree(buf); |
a8327734 |
876 | } |
877 | |
6b5cf8b4 |
878 | #define bombout(msg) \ |
879 | do { \ |
880 | char *text = dupprintf msg; \ |
ac934965 |
881 | ssh_do_close(ssh, FALSE); \ |
6b5cf8b4 |
882 | logevent(text); \ |
883 | connection_fatal(ssh->frontend, "%s", text); \ |
884 | sfree(text); \ |
885 | } while (0) |
a8327734 |
886 | |
9a10ecf4 |
887 | /* Functions to leave bits out of the SSH packet log file. */ |
888 | |
ff3187f6 |
889 | static void dont_log_password(Ssh ssh, struct Packet *pkt, int blanktype) |
9a10ecf4 |
890 | { |
891 | if (ssh->cfg.logomitpass) |
ff3187f6 |
892 | pkt->logmode = blanktype; |
9a10ecf4 |
893 | } |
894 | |
ff3187f6 |
895 | static void dont_log_data(Ssh ssh, struct Packet *pkt, int blanktype) |
9a10ecf4 |
896 | { |
897 | if (ssh->cfg.logomitdata) |
ff3187f6 |
898 | pkt->logmode = blanktype; |
9a10ecf4 |
899 | } |
900 | |
ff3187f6 |
901 | static void end_log_omission(Ssh ssh, struct Packet *pkt) |
9a10ecf4 |
902 | { |
ff3187f6 |
903 | pkt->logmode = PKTLOG_EMIT; |
9a10ecf4 |
904 | } |
905 | |
c6ccd5c2 |
906 | /* Helper function for common bits of parsing cfg.ttymodes. */ |
907 | static void parse_ttymodes(Ssh ssh, char *modes, |
908 | void (*do_mode)(void *data, char *mode, char *val), |
909 | void *data) |
910 | { |
911 | while (*modes) { |
912 | char *t = strchr(modes, '\t'); |
913 | char *m = snewn(t-modes+1, char); |
914 | char *val; |
915 | strncpy(m, modes, t-modes); |
916 | m[t-modes] = '\0'; |
917 | if (*(t+1) == 'A') |
918 | val = get_ttymode(ssh->frontend, m); |
919 | else |
920 | val = dupstr(t+2); |
921 | if (val) |
922 | do_mode(data, m, val); |
923 | sfree(m); |
924 | sfree(val); |
925 | modes += strlen(modes) + 1; |
926 | } |
927 | } |
928 | |
32874aea |
929 | static int ssh_channelcmp(void *av, void *bv) |
930 | { |
931 | struct ssh_channel *a = (struct ssh_channel *) av; |
932 | struct ssh_channel *b = (struct ssh_channel *) bv; |
933 | if (a->localid < b->localid) |
934 | return -1; |
935 | if (a->localid > b->localid) |
936 | return +1; |
dacbd0e8 |
937 | return 0; |
938 | } |
32874aea |
939 | static int ssh_channelfind(void *av, void *bv) |
940 | { |
941 | unsigned *a = (unsigned *) av; |
942 | struct ssh_channel *b = (struct ssh_channel *) bv; |
943 | if (*a < b->localid) |
944 | return -1; |
945 | if (*a > b->localid) |
946 | return +1; |
dacbd0e8 |
947 | return 0; |
948 | } |
949 | |
bc240b21 |
950 | static int ssh_rportcmp_ssh1(void *av, void *bv) |
d74d141c |
951 | { |
952 | struct ssh_rportfwd *a = (struct ssh_rportfwd *) av; |
953 | struct ssh_rportfwd *b = (struct ssh_rportfwd *) bv; |
954 | int i; |
bc240b21 |
955 | if ( (i = strcmp(a->dhost, b->dhost)) != 0) |
d74d141c |
956 | return i < 0 ? -1 : +1; |
bc240b21 |
957 | if (a->dport > b->dport) |
958 | return +1; |
959 | if (a->dport < b->dport) |
960 | return -1; |
961 | return 0; |
962 | } |
963 | |
964 | static int ssh_rportcmp_ssh2(void *av, void *bv) |
965 | { |
966 | struct ssh_rportfwd *a = (struct ssh_rportfwd *) av; |
967 | struct ssh_rportfwd *b = (struct ssh_rportfwd *) bv; |
cdcbdf3b |
968 | |
bc240b21 |
969 | if (a->sport > b->sport) |
d74d141c |
970 | return +1; |
bc240b21 |
971 | if (a->sport < b->sport) |
972 | return -1; |
d74d141c |
973 | return 0; |
974 | } |
975 | |
fda2feb1 |
976 | /* |
977 | * Special form of strcmp which can cope with NULL inputs. NULL is |
978 | * defined to sort before even the empty string. |
979 | */ |
980 | static int nullstrcmp(const char *a, const char *b) |
981 | { |
982 | if (a == NULL && b == NULL) |
983 | return 0; |
984 | if (a == NULL) |
985 | return -1; |
986 | if (b == NULL) |
987 | return +1; |
988 | return strcmp(a, b); |
989 | } |
990 | |
991 | static int ssh_portcmp(void *av, void *bv) |
992 | { |
993 | struct ssh_portfwd *a = (struct ssh_portfwd *) av; |
994 | struct ssh_portfwd *b = (struct ssh_portfwd *) bv; |
995 | int i; |
996 | if (a->type > b->type) |
997 | return +1; |
998 | if (a->type < b->type) |
999 | return -1; |
84328ddb |
1000 | if (a->addressfamily > b->addressfamily) |
1001 | return +1; |
1002 | if (a->addressfamily < b->addressfamily) |
1003 | return -1; |
fda2feb1 |
1004 | if ( (i = nullstrcmp(a->saddr, b->saddr)) != 0) |
1005 | return i < 0 ? -1 : +1; |
1006 | if (a->sport > b->sport) |
1007 | return +1; |
1008 | if (a->sport < b->sport) |
1009 | return -1; |
1010 | if (a->type != 'D') { |
1011 | if ( (i = nullstrcmp(a->daddr, b->daddr)) != 0) |
1012 | return i < 0 ? -1 : +1; |
1013 | if (a->dport > b->dport) |
1014 | return +1; |
1015 | if (a->dport < b->dport) |
1016 | return -1; |
1017 | } |
1018 | return 0; |
1019 | } |
1020 | |
51470298 |
1021 | static int alloc_channel_id(Ssh ssh) |
32874aea |
1022 | { |
260f3dec |
1023 | const unsigned CHANNEL_NUMBER_OFFSET = 256; |
1024 | unsigned low, high, mid; |
d2371c81 |
1025 | int tsize; |
1026 | struct ssh_channel *c; |
1027 | |
1028 | /* |
1029 | * First-fit allocation of channel numbers: always pick the |
1030 | * lowest unused one. To do this, binary-search using the |
1031 | * counted B-tree to find the largest channel ID which is in a |
1032 | * contiguous sequence from the beginning. (Precisely |
1033 | * everything in that sequence must have ID equal to its tree |
1034 | * index plus CHANNEL_NUMBER_OFFSET.) |
1035 | */ |
51470298 |
1036 | tsize = count234(ssh->channels); |
d2371c81 |
1037 | |
32874aea |
1038 | low = -1; |
1039 | high = tsize; |
d2371c81 |
1040 | while (high - low > 1) { |
1041 | mid = (high + low) / 2; |
51470298 |
1042 | c = index234(ssh->channels, mid); |
d2371c81 |
1043 | if (c->localid == mid + CHANNEL_NUMBER_OFFSET) |
1044 | low = mid; /* this one is fine */ |
1045 | else |
1046 | high = mid; /* this one is past it */ |
1047 | } |
1048 | /* |
1049 | * Now low points to either -1, or the tree index of the |
1050 | * largest ID in the initial sequence. |
1051 | */ |
1052 | { |
1053 | unsigned i = low + 1 + CHANNEL_NUMBER_OFFSET; |
51470298 |
1054 | assert(NULL == find234(ssh->channels, &i, ssh_channelfind)); |
d2371c81 |
1055 | } |
1056 | return low + 1 + CHANNEL_NUMBER_OFFSET; |
1057 | } |
1058 | |
edd0cb8a |
1059 | static void c_write_stderr(int trusted, const char *buf, int len) |
1060 | { |
1061 | int i; |
1062 | for (i = 0; i < len; i++) |
667deca9 |
1063 | if (buf[i] != '\r' && (trusted || buf[i] == '\n' || (buf[i] & 0x60))) |
edd0cb8a |
1064 | fputc(buf[i], stderr); |
1065 | } |
1066 | |
9fab77dc |
1067 | static void c_write(Ssh ssh, const char *buf, int len) |
32874aea |
1068 | { |
edd0cb8a |
1069 | if (flags & FLAG_STDERR) |
1070 | c_write_stderr(1, buf, len); |
1071 | else |
1072 | from_backend(ssh->frontend, 1, buf, len); |
3bdaf79d |
1073 | } |
1074 | |
9fab77dc |
1075 | static void c_write_untrusted(Ssh ssh, const char *buf, int len) |
32874aea |
1076 | { |
edd0cb8a |
1077 | if (flags & FLAG_STDERR) |
1078 | c_write_stderr(0, buf, len); |
1079 | else |
1080 | from_backend_untrusted(ssh->frontend, buf, len); |
a209e957 |
1081 | } |
1082 | |
9fab77dc |
1083 | static void c_write_str(Ssh ssh, const char *buf) |
32874aea |
1084 | { |
51470298 |
1085 | c_write(ssh, buf, strlen(buf)); |
1408a877 |
1086 | } |
1087 | |
ff3187f6 |
1088 | static void ssh_free_packet(struct Packet *pkt) |
1089 | { |
1090 | sfree(pkt->data); |
1091 | sfree(pkt); |
1092 | } |
1093 | static struct Packet *ssh_new_packet(void) |
1094 | { |
1095 | struct Packet *pkt = snew(struct Packet); |
1096 | |
dacd8872 |
1097 | pkt->body = pkt->data = NULL; |
ff3187f6 |
1098 | pkt->maxlen = 0; |
1099 | pkt->logmode = PKTLOG_EMIT; |
1100 | pkt->nblanks = 0; |
1101 | pkt->blanks = NULL; |
1102 | |
1103 | return pkt; |
1104 | } |
1105 | |
fb09bf1c |
1106 | /* |
1107 | * Collect incoming data in the incoming packet buffer. |
e5574168 |
1108 | * Decipher and verify the packet when it is completely read. |
1109 | * Drop SSH1_MSG_DEBUG and SSH1_MSG_IGNORE packets. |
fb09bf1c |
1110 | * Update the *data and *datalen variables. |
ff3187f6 |
1111 | * Return a Packet structure when a packet is completed. |
fb09bf1c |
1112 | */ |
ff3187f6 |
1113 | static struct Packet *ssh1_rdpkt(Ssh ssh, unsigned char **data, int *datalen) |
fb09bf1c |
1114 | { |
51470298 |
1115 | struct rdpkt1_state_tag *st = &ssh->rdpkt1_state; |
374330e2 |
1116 | |
51470298 |
1117 | crBegin(ssh->ssh1_rdpkt_crstate); |
374330e2 |
1118 | |
ff3187f6 |
1119 | st->pktin = ssh_new_packet(); |
1120 | |
1121 | st->pktin->type = 0; |
1122 | st->pktin->length = 0; |
374330e2 |
1123 | |
57476f6b |
1124 | for (st->i = st->len = 0; st->i < 4; st->i++) { |
fb09bf1c |
1125 | while ((*datalen) == 0) |
ff3187f6 |
1126 | crReturn(NULL); |
57476f6b |
1127 | st->len = (st->len << 8) + **data; |
fb09bf1c |
1128 | (*data)++, (*datalen)--; |
1129 | } |
374330e2 |
1130 | |
57476f6b |
1131 | st->pad = 8 - (st->len % 8); |
1132 | st->biglen = st->len + st->pad; |
ff3187f6 |
1133 | st->pktin->length = st->len - 5; |
fb09bf1c |
1134 | |
ae0500e5 |
1135 | if (st->biglen < 0) { |
1136 | bombout(("Extremely large packet length from server suggests" |
1137 | " data stream corruption")); |
ff3187f6 |
1138 | ssh_free_packet(st->pktin); |
1139 | crStop(NULL); |
ae0500e5 |
1140 | } |
1141 | |
ff3187f6 |
1142 | st->pktin->maxlen = st->biglen; |
1143 | st->pktin->data = snewn(st->biglen + APIEXTRA, unsigned char); |
374330e2 |
1144 | |
57476f6b |
1145 | st->to_read = st->biglen; |
ff3187f6 |
1146 | st->p = st->pktin->data; |
57476f6b |
1147 | while (st->to_read > 0) { |
32874aea |
1148 | st->chunk = st->to_read; |
fb09bf1c |
1149 | while ((*datalen) == 0) |
ff3187f6 |
1150 | crReturn(NULL); |
57476f6b |
1151 | if (st->chunk > (*datalen)) |
1152 | st->chunk = (*datalen); |
1153 | memcpy(st->p, *data, st->chunk); |
1154 | *data += st->chunk; |
1155 | *datalen -= st->chunk; |
1156 | st->p += st->chunk; |
1157 | st->to_read -= st->chunk; |
fb09bf1c |
1158 | } |
374330e2 |
1159 | |
ff3187f6 |
1160 | if (ssh->cipher && detect_attack(ssh->crcda_ctx, st->pktin->data, |
0183b242 |
1161 | st->biglen, NULL)) { |
6b5cf8b4 |
1162 | bombout(("Network attack (CRC compensation) detected!")); |
ff3187f6 |
1163 | ssh_free_packet(st->pktin); |
1164 | crStop(NULL); |
9a3a93a5 |
1165 | } |
1166 | |
51470298 |
1167 | if (ssh->cipher) |
ff3187f6 |
1168 | ssh->cipher->decrypt(ssh->v1_cipher_ctx, st->pktin->data, st->biglen); |
374330e2 |
1169 | |
ff3187f6 |
1170 | st->realcrc = crc32_compute(st->pktin->data, st->biglen - 4); |
1171 | st->gotcrc = GET_32BIT(st->pktin->data + st->biglen - 4); |
57476f6b |
1172 | if (st->gotcrc != st->realcrc) { |
6b5cf8b4 |
1173 | bombout(("Incorrect CRC received on packet")); |
ff3187f6 |
1174 | ssh_free_packet(st->pktin); |
1175 | crStop(NULL); |
fb09bf1c |
1176 | } |
572f871e |
1177 | |
ff3187f6 |
1178 | st->pktin->body = st->pktin->data + st->pad + 1; |
1179 | st->pktin->savedpos = 0; |
4ba9b64b |
1180 | |
51470298 |
1181 | if (ssh->v1_compressing) { |
4ba9b64b |
1182 | unsigned char *decompblk; |
1183 | int decomplen; |
36b8d9bb |
1184 | if (!zlib_decompress_block(ssh->sc_comp_ctx, |
ff3187f6 |
1185 | st->pktin->body - 1, st->pktin->length + 1, |
36b8d9bb |
1186 | &decompblk, &decomplen)) { |
1187 | bombout(("Zlib decompression encountered invalid data")); |
ff3187f6 |
1188 | ssh_free_packet(st->pktin); |
1189 | crStop(NULL); |
36b8d9bb |
1190 | } |
4ba9b64b |
1191 | |
ff3187f6 |
1192 | if (st->pktin->maxlen < st->pad + decomplen) { |
1193 | st->pktin->maxlen = st->pad + decomplen; |
1194 | st->pktin->data = sresize(st->pktin->data, |
1195 | st->pktin->maxlen + APIEXTRA, |
3d88e64d |
1196 | unsigned char); |
ff3187f6 |
1197 | st->pktin->body = st->pktin->data + st->pad + 1; |
4ba9b64b |
1198 | } |
1199 | |
ff3187f6 |
1200 | memcpy(st->pktin->body - 1, decompblk, decomplen); |
dcbde236 |
1201 | sfree(decompblk); |
ff3187f6 |
1202 | st->pktin->length = decomplen - 1; |
4ba9b64b |
1203 | } |
1204 | |
ff3187f6 |
1205 | st->pktin->type = st->pktin->body[-1]; |
00db133f |
1206 | |
9a10ecf4 |
1207 | /* |
1208 | * Log incoming packet, possibly omitting sensitive fields. |
1209 | */ |
1210 | if (ssh->logctx) { |
1211 | int nblanks = 0; |
1212 | struct logblank_t blank; |
1213 | if (ssh->cfg.logomitdata) { |
1214 | int do_blank = FALSE, blank_prefix = 0; |
1215 | /* "Session data" packets - omit the data field */ |
ff3187f6 |
1216 | if ((st->pktin->type == SSH1_SMSG_STDOUT_DATA) || |
1217 | (st->pktin->type == SSH1_SMSG_STDERR_DATA)) { |
9a10ecf4 |
1218 | do_blank = TRUE; blank_prefix = 0; |
ff3187f6 |
1219 | } else if (st->pktin->type == SSH1_MSG_CHANNEL_DATA) { |
9a10ecf4 |
1220 | do_blank = TRUE; blank_prefix = 4; |
1221 | } |
1222 | if (do_blank) { |
1223 | blank.offset = blank_prefix; |
ff3187f6 |
1224 | blank.len = st->pktin->length; |
9a10ecf4 |
1225 | blank.type = PKTLOG_OMIT; |
1226 | nblanks = 1; |
1227 | } |
1228 | } |
a8327734 |
1229 | log_packet(ssh->logctx, |
ff3187f6 |
1230 | PKT_INCOMING, st->pktin->type, |
1231 | ssh1_pkt_type(st->pktin->type), |
1232 | st->pktin->body, st->pktin->length, |
9a10ecf4 |
1233 | nblanks, &blank); |
1234 | } |
00db133f |
1235 | |
ff3187f6 |
1236 | crFinish(st->pktin); |
fb09bf1c |
1237 | } |
1238 | |
ff3187f6 |
1239 | static struct Packet *ssh2_rdpkt(Ssh ssh, unsigned char **data, int *datalen) |
e5574168 |
1240 | { |
51470298 |
1241 | struct rdpkt2_state_tag *st = &ssh->rdpkt2_state; |
e5574168 |
1242 | |
51470298 |
1243 | crBegin(ssh->ssh2_rdpkt_crstate); |
e5574168 |
1244 | |
ff3187f6 |
1245 | st->pktin = ssh_new_packet(); |
1246 | |
1247 | st->pktin->type = 0; |
1248 | st->pktin->length = 0; |
51470298 |
1249 | if (ssh->sccipher) |
1250 | st->cipherblk = ssh->sccipher->blksize; |
e5574168 |
1251 | else |
32874aea |
1252 | st->cipherblk = 8; |
960e736a |
1253 | if (st->cipherblk < 8) |
32874aea |
1254 | st->cipherblk = 8; |
960e736a |
1255 | |
ff3187f6 |
1256 | st->pktin->data = snewn(st->cipherblk + APIEXTRA, unsigned char); |
e5574168 |
1257 | |
1258 | /* |
1259 | * Acquire and decrypt the first block of the packet. This will |
1260 | * contain the length and padding details. |
1261 | */ |
32874aea |
1262 | for (st->i = st->len = 0; st->i < st->cipherblk; st->i++) { |
e5574168 |
1263 | while ((*datalen) == 0) |
ff3187f6 |
1264 | crReturn(NULL); |
1265 | st->pktin->data[st->i] = *(*data)++; |
32874aea |
1266 | (*datalen)--; |
e5574168 |
1267 | } |
4252c9cc |
1268 | |
51470298 |
1269 | if (ssh->sccipher) |
371e569c |
1270 | ssh->sccipher->decrypt(ssh->sc_cipher_ctx, |
ff3187f6 |
1271 | st->pktin->data, st->cipherblk); |
e5574168 |
1272 | |
1273 | /* |
1274 | * Now get the length and padding figures. |
1275 | */ |
ff3187f6 |
1276 | st->len = GET_32BIT(st->pktin->data); |
1277 | st->pad = st->pktin->data[4]; |
e5574168 |
1278 | |
1279 | /* |
717dc483 |
1280 | * _Completely_ silly lengths should be stomped on before they |
1281 | * do us any more damage. |
1282 | */ |
cba1e4b5 |
1283 | if (st->len < 0 || st->len > 35000 || st->pad < 4 || |
1284 | st->len - st->pad < 1 || (st->len + 4) % st->cipherblk != 0) { |
6b5cf8b4 |
1285 | bombout(("Incoming packet was garbled on decryption")); |
ff3187f6 |
1286 | ssh_free_packet(st->pktin); |
1287 | crStop(NULL); |
717dc483 |
1288 | } |
1289 | |
1290 | /* |
e5574168 |
1291 | * This enables us to deduce the payload length. |
1292 | */ |
960e736a |
1293 | st->payload = st->len - st->pad - 1; |
e5574168 |
1294 | |
ff3187f6 |
1295 | st->pktin->length = st->payload + 5; |
e5574168 |
1296 | |
1297 | /* |
1298 | * So now we can work out the total packet length. |
1299 | */ |
960e736a |
1300 | st->packetlen = st->len + 4; |
51470298 |
1301 | st->maclen = ssh->scmac ? ssh->scmac->len : 0; |
e5574168 |
1302 | |
1303 | /* |
ff3187f6 |
1304 | * Allocate memory for the rest of the packet. |
e5574168 |
1305 | */ |
ff3187f6 |
1306 | st->pktin->maxlen = st->packetlen + st->maclen; |
1307 | st->pktin->data = sresize(st->pktin->data, |
1308 | st->pktin->maxlen + APIEXTRA, |
1309 | unsigned char); |
e5574168 |
1310 | |
1311 | /* |
1312 | * Read and decrypt the remainder of the packet. |
1313 | */ |
32874aea |
1314 | for (st->i = st->cipherblk; st->i < st->packetlen + st->maclen; |
1315 | st->i++) { |
e5574168 |
1316 | while ((*datalen) == 0) |
ff3187f6 |
1317 | crReturn(NULL); |
1318 | st->pktin->data[st->i] = *(*data)++; |
32874aea |
1319 | (*datalen)--; |
e5574168 |
1320 | } |
1321 | /* Decrypt everything _except_ the MAC. */ |
51470298 |
1322 | if (ssh->sccipher) |
371e569c |
1323 | ssh->sccipher->decrypt(ssh->sc_cipher_ctx, |
ff3187f6 |
1324 | st->pktin->data + st->cipherblk, |
51470298 |
1325 | st->packetlen - st->cipherblk); |
e5574168 |
1326 | |
9442dd57 |
1327 | st->pktin->encrypted_len = st->packetlen; |
1328 | |
e5574168 |
1329 | /* |
1330 | * Check the MAC. |
1331 | */ |
51470298 |
1332 | if (ssh->scmac |
ff3187f6 |
1333 | && !ssh->scmac->verify(ssh->sc_mac_ctx, st->pktin->data, st->len + 4, |
51470298 |
1334 | st->incoming_sequence)) { |
6b5cf8b4 |
1335 | bombout(("Incorrect MAC received on packet")); |
ff3187f6 |
1336 | ssh_free_packet(st->pktin); |
1337 | crStop(NULL); |
8d5de777 |
1338 | } |
b09eaa88 |
1339 | |
1340 | st->pktin->sequence = st->incoming_sequence++; |
e5574168 |
1341 | |
4ba9b64b |
1342 | /* |
1343 | * Decompress packet payload. |
1344 | */ |
1345 | { |
1346 | unsigned char *newpayload; |
1347 | int newlen; |
51470298 |
1348 | if (ssh->sccomp && |
5366aed8 |
1349 | ssh->sccomp->decompress(ssh->sc_comp_ctx, |
ff3187f6 |
1350 | st->pktin->data + 5, st->pktin->length - 5, |
51470298 |
1351 | &newpayload, &newlen)) { |
ff3187f6 |
1352 | if (st->pktin->maxlen < newlen + 5) { |
1353 | st->pktin->maxlen = newlen + 5; |
1354 | st->pktin->data = sresize(st->pktin->data, |
1355 | st->pktin->maxlen + APIEXTRA, |
3d88e64d |
1356 | unsigned char); |
4ba9b64b |
1357 | } |
ff3187f6 |
1358 | st->pktin->length = 5 + newlen; |
1359 | memcpy(st->pktin->data + 5, newpayload, newlen); |
dcbde236 |
1360 | sfree(newpayload); |
4ba9b64b |
1361 | } |
1362 | } |
1363 | |
ff3187f6 |
1364 | st->pktin->savedpos = 6; |
1365 | st->pktin->body = st->pktin->data; |
1366 | st->pktin->type = st->pktin->data[5]; |
e5574168 |
1367 | |
9a10ecf4 |
1368 | /* |
1369 | * Log incoming packet, possibly omitting sensitive fields. |
1370 | */ |
1371 | if (ssh->logctx) { |
1372 | int nblanks = 0; |
1373 | struct logblank_t blank; |
1374 | if (ssh->cfg.logomitdata) { |
1375 | int do_blank = FALSE, blank_prefix = 0; |
1376 | /* "Session data" packets - omit the data field */ |
ff3187f6 |
1377 | if (st->pktin->type == SSH2_MSG_CHANNEL_DATA) { |
9a10ecf4 |
1378 | do_blank = TRUE; blank_prefix = 4; |
ff3187f6 |
1379 | } else if (st->pktin->type == SSH2_MSG_CHANNEL_EXTENDED_DATA) { |
9a10ecf4 |
1380 | do_blank = TRUE; blank_prefix = 8; |
1381 | } |
1382 | if (do_blank) { |
1383 | blank.offset = blank_prefix; |
ff3187f6 |
1384 | blank.len = (st->pktin->length-6) - blank_prefix; |
9a10ecf4 |
1385 | blank.type = PKTLOG_OMIT; |
1386 | nblanks = 1; |
1387 | } |
1388 | } |
ff3187f6 |
1389 | log_packet(ssh->logctx, PKT_INCOMING, st->pktin->type, |
1390 | ssh2_pkt_type(ssh->pkt_ctx, st->pktin->type), |
1391 | st->pktin->data+6, st->pktin->length-6, |
9a10ecf4 |
1392 | nblanks, &blank); |
1393 | } |
00db133f |
1394 | |
ff3187f6 |
1395 | crFinish(st->pktin); |
e5574168 |
1396 | } |
1397 | |
dacd8872 |
1398 | static int s_wrpkt_prepare(Ssh ssh, struct Packet *pkt, int *offset_p) |
32874aea |
1399 | { |
dacd8872 |
1400 | int pad, biglen, i, pktoffs; |
374330e2 |
1401 | unsigned long crc; |
fd7a4aad |
1402 | #ifdef __SC__ |
1403 | /* |
1404 | * XXX various versions of SC (including 8.8.4) screw up the |
1405 | * register allocation in this function and use the same register |
1406 | * (D6) for len and as a temporary, with predictable results. The |
1407 | * following sledgehammer prevents this. |
1408 | */ |
1409 | volatile |
1410 | #endif |
1411 | int len; |
374330e2 |
1412 | |
a8327734 |
1413 | if (ssh->logctx) |
dacd8872 |
1414 | log_packet(ssh->logctx, PKT_OUTGOING, pkt->data[12], |
1415 | ssh1_pkt_type(pkt->data[12]), |
1416 | pkt->body, pkt->length - (pkt->body - pkt->data), |
ff3187f6 |
1417 | pkt->nblanks, pkt->blanks); |
1418 | sfree(pkt->blanks); pkt->blanks = NULL; |
1419 | pkt->nblanks = 0; |
00db133f |
1420 | |
51470298 |
1421 | if (ssh->v1_compressing) { |
4ba9b64b |
1422 | unsigned char *compblk; |
1423 | int complen; |
5366aed8 |
1424 | zlib_compress_block(ssh->cs_comp_ctx, |
dacd8872 |
1425 | pkt->data + 12, pkt->length - 12, |
4ba9b64b |
1426 | &compblk, &complen); |
48406e6b |
1427 | ssh_pkt_ensure(pkt, complen + 2); /* just in case it's got bigger */ |
dacd8872 |
1428 | memcpy(pkt->data + 12, compblk, complen); |
dcbde236 |
1429 | sfree(compblk); |
dacd8872 |
1430 | pkt->length = complen + 12; |
4ba9b64b |
1431 | } |
1432 | |
dacd8872 |
1433 | ssh_pkt_ensure(pkt, pkt->length + 4); /* space for CRC */ |
1434 | pkt->length += 4; |
1435 | len = pkt->length - 4 - 8; /* len(type+data+CRC) */ |
32874aea |
1436 | pad = 8 - (len % 8); |
dacd8872 |
1437 | pktoffs = 8 - pad; |
1438 | biglen = len + pad; /* len(padding+type+data+CRC) */ |
374330e2 |
1439 | |
dacd8872 |
1440 | for (i = pktoffs; i < 4+8; i++) |
1441 | pkt->data[i] = random_byte(); |
1442 | crc = crc32_compute(pkt->data + pktoffs + 4, biglen - 4); /* all ex len */ |
1443 | PUT_32BIT(pkt->data + pktoffs + 4 + biglen - 4, crc); |
1444 | PUT_32BIT(pkt->data + pktoffs, len); |
374330e2 |
1445 | |
51470298 |
1446 | if (ssh->cipher) |
dacd8872 |
1447 | ssh->cipher->encrypt(ssh->v1_cipher_ctx, |
1448 | pkt->data + pktoffs + 4, biglen); |
374330e2 |
1449 | |
dacd8872 |
1450 | if (offset_p) *offset_p = pktoffs; |
1451 | return biglen + 4; /* len(length+padding+type+data+CRC) */ |
39065bed |
1452 | } |
1453 | |
bf8a49a1 |
1454 | static int s_write(Ssh ssh, void *data, int len) |
1455 | { |
1456 | log_packet(ssh->logctx, PKT_OUTGOING, -1, NULL, data, len, 0, NULL); |
1457 | return sk_write(ssh->s, (char *)data, len); |
1458 | } |
1459 | |
ff3187f6 |
1460 | static void s_wrpkt(Ssh ssh, struct Packet *pkt) |
32874aea |
1461 | { |
dacd8872 |
1462 | int len, backlog, offset; |
1463 | len = s_wrpkt_prepare(ssh, pkt, &offset); |
bf8a49a1 |
1464 | backlog = s_write(ssh, pkt->data + offset, len); |
5471d09a |
1465 | if (backlog > SSH_MAX_BACKLOG) |
51470298 |
1466 | ssh_throttle_all(ssh, 1, backlog); |
dacd8872 |
1467 | ssh_free_packet(pkt); |
39065bed |
1468 | } |
1469 | |
ff3187f6 |
1470 | static void s_wrpkt_defer(Ssh ssh, struct Packet *pkt) |
32874aea |
1471 | { |
dacd8872 |
1472 | int len, offset; |
1473 | len = s_wrpkt_prepare(ssh, pkt, &offset); |
51470298 |
1474 | if (ssh->deferred_len + len > ssh->deferred_size) { |
1475 | ssh->deferred_size = ssh->deferred_len + len + 128; |
3d88e64d |
1476 | ssh->deferred_send_data = sresize(ssh->deferred_send_data, |
1477 | ssh->deferred_size, |
1478 | unsigned char); |
39065bed |
1479 | } |
dacd8872 |
1480 | memcpy(ssh->deferred_send_data + ssh->deferred_len, |
1481 | pkt->data + offset, len); |
51470298 |
1482 | ssh->deferred_len += len; |
dacd8872 |
1483 | ssh_free_packet(pkt); |
374330e2 |
1484 | } |
1485 | |
fb09bf1c |
1486 | /* |
dacd8872 |
1487 | * Construct a SSH-1 packet with the specified contents. |
1488 | * (This all-at-once interface used to be the only one, but now SSH-1 |
1489 | * packets can also be constructed incrementally.) |
fb09bf1c |
1490 | */ |
dacd8872 |
1491 | static struct Packet *construct_packet(Ssh ssh, int pkttype, va_list ap) |
fb09bf1c |
1492 | { |
dacd8872 |
1493 | int argtype; |
7cca0d81 |
1494 | Bignum bn; |
ff3187f6 |
1495 | struct Packet *pkt; |
fb09bf1c |
1496 | |
dacd8872 |
1497 | pkt = ssh1_pkt_init(pkttype); |
fb09bf1c |
1498 | |
dacd8872 |
1499 | while ((argtype = va_arg(ap, int)) != PKT_END) { |
1500 | unsigned char *argp, argchar; |
8a9977e5 |
1501 | char *sargp; |
dacd8872 |
1502 | unsigned long argint; |
1503 | int arglen; |
fb09bf1c |
1504 | switch (argtype) { |
9a10ecf4 |
1505 | /* Actual fields in the packet */ |
fb09bf1c |
1506 | case PKT_INT: |
dacd8872 |
1507 | argint = va_arg(ap, int); |
1508 | ssh_pkt_adduint32(pkt, argint); |
fb09bf1c |
1509 | break; |
1510 | case PKT_CHAR: |
dacd8872 |
1511 | argchar = (unsigned char) va_arg(ap, int); |
1512 | ssh_pkt_addbyte(pkt, argchar); |
fb09bf1c |
1513 | break; |
1514 | case PKT_DATA: |
dacd8872 |
1515 | argp = va_arg(ap, unsigned char *); |
1516 | arglen = va_arg(ap, int); |
1517 | ssh_pkt_adddata(pkt, argp, arglen); |
fb09bf1c |
1518 | break; |
1519 | case PKT_STR: |
8a9977e5 |
1520 | sargp = va_arg(ap, char *); |
1521 | ssh_pkt_addstring(pkt, sargp); |
fb09bf1c |
1522 | break; |
7cca0d81 |
1523 | case PKT_BIGNUM: |
dacd8872 |
1524 | bn = va_arg(ap, Bignum); |
1525 | ssh1_pkt_addmp(pkt, bn); |
9a10ecf4 |
1526 | break; |
1527 | /* Tokens for modifications to packet logging */ |
1528 | case PKTT_PASSWORD: |
ff3187f6 |
1529 | dont_log_password(ssh, pkt, PKTLOG_BLANK); |
9a10ecf4 |
1530 | break; |
1531 | case PKTT_DATA: |
ff3187f6 |
1532 | dont_log_data(ssh, pkt, PKTLOG_OMIT); |
7cca0d81 |
1533 | break; |
9a10ecf4 |
1534 | case PKTT_OTHER: |
ff3187f6 |
1535 | end_log_omission(ssh, pkt); |
9a10ecf4 |
1536 | break; |
1537 | } |
fb09bf1c |
1538 | } |
ff3187f6 |
1539 | |
1540 | return pkt; |
39065bed |
1541 | } |
fb09bf1c |
1542 | |
51470298 |
1543 | static void send_packet(Ssh ssh, int pkttype, ...) |
32874aea |
1544 | { |
ff3187f6 |
1545 | struct Packet *pkt; |
dacd8872 |
1546 | va_list ap; |
1547 | va_start(ap, pkttype); |
1548 | pkt = construct_packet(ssh, pkttype, ap); |
1549 | va_end(ap); |
ff3187f6 |
1550 | s_wrpkt(ssh, pkt); |
fb09bf1c |
1551 | } |
1552 | |
51470298 |
1553 | static void defer_packet(Ssh ssh, int pkttype, ...) |
32874aea |
1554 | { |
ff3187f6 |
1555 | struct Packet *pkt; |
dacd8872 |
1556 | va_list ap; |
1557 | va_start(ap, pkttype); |
1558 | pkt = construct_packet(ssh, pkttype, ap); |
1559 | va_end(ap); |
ff3187f6 |
1560 | s_wrpkt_defer(ssh, pkt); |
39065bed |
1561 | } |
1562 | |
32874aea |
1563 | static int ssh_versioncmp(char *a, char *b) |
1564 | { |
9697bfd2 |
1565 | char *ae, *be; |
1566 | unsigned long av, bv; |
1567 | |
43aa02a7 |
1568 | av = strtoul(a, &ae, 10); |
1569 | bv = strtoul(b, &be, 10); |
32874aea |
1570 | if (av != bv) |
1571 | return (av < bv ? -1 : +1); |
1572 | if (*ae == '.') |
1573 | ae++; |
1574 | if (*be == '.') |
1575 | be++; |
43aa02a7 |
1576 | av = strtoul(ae, &ae, 10); |
1577 | bv = strtoul(be, &be, 10); |
32874aea |
1578 | if (av != bv) |
1579 | return (av < bv ? -1 : +1); |
9697bfd2 |
1580 | return 0; |
1581 | } |
1582 | |
e5574168 |
1583 | /* |
a92dd380 |
1584 | * Utility routines for putting an SSH-protocol `string' and |
b672f405 |
1585 | * `uint32' into a hash state. |
e5574168 |
1586 | */ |
b672f405 |
1587 | static void hash_string(const struct ssh_hash *h, void *s, void *str, int len) |
32874aea |
1588 | { |
e5574168 |
1589 | unsigned char lenblk[4]; |
e5574168 |
1590 | PUT_32BIT(lenblk, len); |
b672f405 |
1591 | h->bytes(s, lenblk, 4); |
1592 | h->bytes(s, str, len); |
e5574168 |
1593 | } |
1594 | |
b672f405 |
1595 | static void hash_uint32(const struct ssh_hash *h, void *s, unsigned i) |
32874aea |
1596 | { |
a92dd380 |
1597 | unsigned char intblk[4]; |
1598 | PUT_32BIT(intblk, i); |
b672f405 |
1599 | h->bytes(s, intblk, 4); |
a92dd380 |
1600 | } |
1601 | |
7cca0d81 |
1602 | /* |
dacd8872 |
1603 | * Packet construction functions. Mostly shared between SSH-1 and SSH-2. |
7cca0d81 |
1604 | */ |
dacd8872 |
1605 | static void ssh_pkt_ensure(struct Packet *pkt, int length) |
32874aea |
1606 | { |
ff3187f6 |
1607 | if (pkt->maxlen < length) { |
dacd8872 |
1608 | unsigned char *body = pkt->body; |
3d71de0b |
1609 | int offset = body ? body - pkt->data : 0; |
ff3187f6 |
1610 | pkt->maxlen = length + 256; |
1611 | pkt->data = sresize(pkt->data, pkt->maxlen + APIEXTRA, unsigned char); |
dacd8872 |
1612 | if (body) pkt->body = pkt->data + offset; |
7cca0d81 |
1613 | } |
783415f8 |
1614 | } |
dacd8872 |
1615 | static void ssh_pkt_adddata(struct Packet *pkt, void *data, int len) |
32874aea |
1616 | { |
ff3187f6 |
1617 | if (pkt->logmode != PKTLOG_EMIT) { |
1618 | pkt->nblanks++; |
1619 | pkt->blanks = sresize(pkt->blanks, pkt->nblanks, struct logblank_t); |
dacd8872 |
1620 | assert(pkt->body); |
1621 | pkt->blanks[pkt->nblanks-1].offset = pkt->length - |
1622 | (pkt->body - pkt->data); |
ff3187f6 |
1623 | pkt->blanks[pkt->nblanks-1].len = len; |
1624 | pkt->blanks[pkt->nblanks-1].type = pkt->logmode; |
1625 | } |
1626 | pkt->length += len; |
dacd8872 |
1627 | ssh_pkt_ensure(pkt, pkt->length); |
ff3187f6 |
1628 | memcpy(pkt->data + pkt->length - len, data, len); |
7cca0d81 |
1629 | } |
dacd8872 |
1630 | static void ssh_pkt_addbyte(struct Packet *pkt, unsigned char byte) |
32874aea |
1631 | { |
dacd8872 |
1632 | ssh_pkt_adddata(pkt, &byte, 1); |
7cca0d81 |
1633 | } |
ff3187f6 |
1634 | static void ssh2_pkt_addbool(struct Packet *pkt, unsigned char value) |
32874aea |
1635 | { |
dacd8872 |
1636 | ssh_pkt_adddata(pkt, &value, 1); |
7cca0d81 |
1637 | } |
dacd8872 |
1638 | static void ssh_pkt_adduint32(struct Packet *pkt, unsigned long value) |
32874aea |
1639 | { |
7cca0d81 |
1640 | unsigned char x[4]; |
1641 | PUT_32BIT(x, value); |
dacd8872 |
1642 | ssh_pkt_adddata(pkt, x, 4); |
7cca0d81 |
1643 | } |
dacd8872 |
1644 | static void ssh_pkt_addstring_start(struct Packet *pkt) |
32874aea |
1645 | { |
dacd8872 |
1646 | ssh_pkt_adduint32(pkt, 0); |
ff3187f6 |
1647 | pkt->savedpos = pkt->length; |
7cca0d81 |
1648 | } |
dacd8872 |
1649 | static void ssh_pkt_addstring_str(struct Packet *pkt, char *data) |
32874aea |
1650 | { |
dacd8872 |
1651 | ssh_pkt_adddata(pkt, data, strlen(data)); |
ff3187f6 |
1652 | PUT_32BIT(pkt->data + pkt->savedpos - 4, pkt->length - pkt->savedpos); |
7cca0d81 |
1653 | } |
dacd8872 |
1654 | static void ssh_pkt_addstring_data(struct Packet *pkt, char *data, int len) |
32874aea |
1655 | { |
dacd8872 |
1656 | ssh_pkt_adddata(pkt, data, len); |
ff3187f6 |
1657 | PUT_32BIT(pkt->data + pkt->savedpos - 4, pkt->length - pkt->savedpos); |
7cca0d81 |
1658 | } |
dacd8872 |
1659 | static void ssh_pkt_addstring(struct Packet *pkt, char *data) |
1660 | { |
1661 | ssh_pkt_addstring_start(pkt); |
1662 | ssh_pkt_addstring_str(pkt, data); |
1663 | } |
1664 | static void ssh1_pkt_addmp(struct Packet *pkt, Bignum b) |
32874aea |
1665 | { |
dacd8872 |
1666 | int len = ssh1_bignum_length(b); |
8a9977e5 |
1667 | unsigned char *data = snewn(len, unsigned char); |
dacd8872 |
1668 | (void) ssh1_write_bignum(data, b); |
1669 | ssh_pkt_adddata(pkt, data, len); |
1670 | sfree(data); |
7cca0d81 |
1671 | } |
d8baa528 |
1672 | static unsigned char *ssh2_mpint_fmt(Bignum b, int *len) |
32874aea |
1673 | { |
7cca0d81 |
1674 | unsigned char *p; |
32874aea |
1675 | int i, n = (bignum_bitcount(b) + 7) / 8; |
3d88e64d |
1676 | p = snewn(n + 1, unsigned char); |
7cca0d81 |
1677 | p[0] = 0; |
3709bfe9 |
1678 | for (i = 1; i <= n; i++) |
32874aea |
1679 | p[i] = bignum_byte(b, n - i); |
7cca0d81 |
1680 | i = 0; |
32874aea |
1681 | while (i <= n && p[i] == 0 && (p[i + 1] & 0x80) == 0) |
1682 | i++; |
1683 | memmove(p, p + i, n + 1 - i); |
1684 | *len = n + 1 - i; |
7cca0d81 |
1685 | return p; |
1686 | } |
ff3187f6 |
1687 | static void ssh2_pkt_addmp(struct Packet *pkt, Bignum b) |
32874aea |
1688 | { |
7cca0d81 |
1689 | unsigned char *p; |
1690 | int len; |
1691 | p = ssh2_mpint_fmt(b, &len); |
dacd8872 |
1692 | ssh_pkt_addstring_start(pkt); |
1693 | ssh_pkt_addstring_data(pkt, (char *)p, len); |
dcbde236 |
1694 | sfree(p); |
7cca0d81 |
1695 | } |
b185170a |
1696 | |
dacd8872 |
1697 | static struct Packet *ssh1_pkt_init(int pkt_type) |
1698 | { |
1699 | struct Packet *pkt = ssh_new_packet(); |
1700 | pkt->length = 4 + 8; /* space for length + max padding */ |
1701 | ssh_pkt_addbyte(pkt, pkt_type); |
1702 | pkt->body = pkt->data + pkt->length; |
1703 | return pkt; |
1704 | } |
1705 | |
1706 | /* For legacy code (SSH-1 and -2 packet construction used to be separate) */ |
1707 | #define ssh2_pkt_ensure(pkt, length) ssh_pkt_ensure(pkt, length) |
1708 | #define ssh2_pkt_adddata(pkt, data, len) ssh_pkt_adddata(pkt, data, len) |
1709 | #define ssh2_pkt_addbyte(pkt, byte) ssh_pkt_addbyte(pkt, byte) |
1710 | #define ssh2_pkt_adduint32(pkt, value) ssh_pkt_adduint32(pkt, value) |
1711 | #define ssh2_pkt_addstring_start(pkt) ssh_pkt_addstring_start(pkt) |
1712 | #define ssh2_pkt_addstring_str(pkt, data) ssh_pkt_addstring_str(pkt, data) |
1713 | #define ssh2_pkt_addstring_data(pkt, data, len) ssh_pkt_addstring_data(pkt, data, len) |
1714 | #define ssh2_pkt_addstring(pkt, data) ssh_pkt_addstring(pkt, data) |
1715 | |
1716 | static struct Packet *ssh2_pkt_init(int pkt_type) |
1717 | { |
1718 | struct Packet *pkt = ssh_new_packet(); |
3d71de0b |
1719 | pkt->length = 5; /* space for packet length + padding length */ |
dacd8872 |
1720 | pkt->forcepad = 0; |
1721 | ssh_pkt_addbyte(pkt, (unsigned char) pkt_type); |
3d71de0b |
1722 | pkt->body = pkt->data + pkt->length; /* after packet type */ |
dacd8872 |
1723 | return pkt; |
1724 | } |
1725 | |
b185170a |
1726 | /* |
2e85c969 |
1727 | * Construct an SSH-2 final-form packet: compress it, encrypt it, |
b185170a |
1728 | * put the MAC on it. Final packet, ready to be sent, is stored in |
ff3187f6 |
1729 | * pkt->data. Total length is returned. |
b185170a |
1730 | */ |
ff3187f6 |
1731 | static int ssh2_pkt_construct(Ssh ssh, struct Packet *pkt) |
32874aea |
1732 | { |
7cca0d81 |
1733 | int cipherblk, maclen, padding, i; |
7cca0d81 |
1734 | |
a8327734 |
1735 | if (ssh->logctx) |
ff3187f6 |
1736 | log_packet(ssh->logctx, PKT_OUTGOING, pkt->data[5], |
1737 | ssh2_pkt_type(ssh->pkt_ctx, pkt->data[5]), |
dacd8872 |
1738 | pkt->body, pkt->length - (pkt->body - pkt->data), |
ff3187f6 |
1739 | pkt->nblanks, pkt->blanks); |
1740 | sfree(pkt->blanks); pkt->blanks = NULL; |
1741 | pkt->nblanks = 0; |
00db133f |
1742 | |
7cca0d81 |
1743 | /* |
4ba9b64b |
1744 | * Compress packet payload. |
1745 | */ |
4ba9b64b |
1746 | { |
1747 | unsigned char *newpayload; |
1748 | int newlen; |
51470298 |
1749 | if (ssh->cscomp && |
ff3187f6 |
1750 | ssh->cscomp->compress(ssh->cs_comp_ctx, pkt->data + 5, |
1751 | pkt->length - 5, |
51470298 |
1752 | &newpayload, &newlen)) { |
ff3187f6 |
1753 | pkt->length = 5; |
1754 | ssh2_pkt_adddata(pkt, newpayload, newlen); |
dcbde236 |
1755 | sfree(newpayload); |
4ba9b64b |
1756 | } |
1757 | } |
1758 | |
1759 | /* |
7cca0d81 |
1760 | * Add padding. At least four bytes, and must also bring total |
1761 | * length (minus MAC) up to a multiple of the block size. |
95d2d262 |
1762 | * If pkt->forcepad is set, make sure the packet is at least that size |
1763 | * after padding. |
7cca0d81 |
1764 | */ |
51470298 |
1765 | cipherblk = ssh->cscipher ? ssh->cscipher->blksize : 8; /* block size */ |
32874aea |
1766 | cipherblk = cipherblk < 8 ? 8 : cipherblk; /* or 8 if blksize < 8 */ |
7cca0d81 |
1767 | padding = 4; |
95d2d262 |
1768 | if (pkt->length + padding < pkt->forcepad) |
1769 | padding = pkt->forcepad - pkt->length; |
32874aea |
1770 | padding += |
ff3187f6 |
1771 | (cipherblk - (pkt->length + padding) % cipherblk) % cipherblk; |
95d2d262 |
1772 | assert(padding <= 255); |
51470298 |
1773 | maclen = ssh->csmac ? ssh->csmac->len : 0; |
ff3187f6 |
1774 | ssh2_pkt_ensure(pkt, pkt->length + padding + maclen); |
1775 | pkt->data[4] = padding; |
7cca0d81 |
1776 | for (i = 0; i < padding; i++) |
ff3187f6 |
1777 | pkt->data[pkt->length + i] = random_byte(); |
1778 | PUT_32BIT(pkt->data, pkt->length + padding - 4); |
51470298 |
1779 | if (ssh->csmac) |
ff3187f6 |
1780 | ssh->csmac->generate(ssh->cs_mac_ctx, pkt->data, |
1781 | pkt->length + padding, |
51470298 |
1782 | ssh->v2_outgoing_sequence); |
1783 | ssh->v2_outgoing_sequence++; /* whether or not we MACed */ |
1784 | |
1785 | if (ssh->cscipher) |
371e569c |
1786 | ssh->cscipher->encrypt(ssh->cs_cipher_ctx, |
ff3187f6 |
1787 | pkt->data, pkt->length + padding); |
51470298 |
1788 | |
9442dd57 |
1789 | pkt->encrypted_len = pkt->length + padding; |
1790 | |
ff3187f6 |
1791 | /* Ready-to-send packet starts at pkt->data. We return length. */ |
1792 | return pkt->length + padding + maclen; |
b185170a |
1793 | } |
1794 | |
1795 | /* |
590f6a5f |
1796 | * Routines called from the main SSH code to send packets. There |
1797 | * are quite a few of these, because we have two separate |
1798 | * mechanisms for delaying the sending of packets: |
1799 | * |
1800 | * - In order to send an IGNORE message and a password message in |
1801 | * a single fixed-length blob, we require the ability to |
1802 | * concatenate the encrypted forms of those two packets _into_ a |
1803 | * single blob and then pass it to our <network.h> transport |
1804 | * layer in one go. Hence, there's a deferment mechanism which |
1805 | * works after packet encryption. |
1806 | * |
1807 | * - In order to avoid sending any connection-layer messages |
1808 | * during repeat key exchange, we have to queue up any such |
1809 | * outgoing messages _before_ they are encrypted (and in |
1810 | * particular before they're allocated sequence numbers), and |
1811 | * then send them once we've finished. |
1812 | * |
1813 | * I call these mechanisms `defer' and `queue' respectively, so as |
1814 | * to distinguish them reasonably easily. |
1815 | * |
1816 | * The functions send_noqueue() and defer_noqueue() free the packet |
1817 | * structure they are passed. Every outgoing packet goes through |
1818 | * precisely one of these functions in its life; packets passed to |
1819 | * ssh2_pkt_send() or ssh2_pkt_defer() either go straight to one of |
1820 | * these or get queued, and then when the queue is later emptied |
1821 | * the packets are all passed to defer_noqueue(). |
97ab28d7 |
1822 | * |
1823 | * When using a CBC-mode cipher, it's necessary to ensure that an |
1824 | * attacker can't provide data to be encrypted using an IV that they |
1825 | * know. We ensure this by prefixing each packet that might contain |
1826 | * user data with an SSH_MSG_IGNORE. This is done using the deferral |
1827 | * mechanism, so in this case send_noqueue() ends up redirecting to |
1828 | * defer_noqueue(). If you don't like this inefficiency, don't use |
1829 | * CBC. |
b185170a |
1830 | */ |
590f6a5f |
1831 | |
97ab28d7 |
1832 | static void ssh2_pkt_defer_noqueue(Ssh, struct Packet *, int); |
1833 | static void ssh_pkt_defersend(Ssh); |
1834 | |
590f6a5f |
1835 | /* |
2e85c969 |
1836 | * Send an SSH-2 packet immediately, without queuing or deferring. |
590f6a5f |
1837 | */ |
1838 | static void ssh2_pkt_send_noqueue(Ssh ssh, struct Packet *pkt) |
32874aea |
1839 | { |
5471d09a |
1840 | int len; |
1841 | int backlog; |
97ab28d7 |
1842 | if (ssh->cscipher != NULL && (ssh->cscipher->flags & SSH_CIPHER_IS_CBC)) { |
1843 | /* We need to send two packets, so use the deferral mechanism. */ |
1844 | ssh2_pkt_defer_noqueue(ssh, pkt, FALSE); |
1845 | ssh_pkt_defersend(ssh); |
1846 | return; |
1847 | } |
ff3187f6 |
1848 | len = ssh2_pkt_construct(ssh, pkt); |
bf8a49a1 |
1849 | backlog = s_write(ssh, pkt->data, len); |
5471d09a |
1850 | if (backlog > SSH_MAX_BACKLOG) |
51470298 |
1851 | ssh_throttle_all(ssh, 1, backlog); |
9442dd57 |
1852 | |
1853 | ssh->outgoing_data_size += pkt->encrypted_len; |
1854 | if (!ssh->kex_in_progress && |
d57f70af |
1855 | ssh->max_data_size != 0 && |
1856 | ssh->outgoing_data_size > ssh->max_data_size) |
f382c87d |
1857 | do_ssh2_transport(ssh, "too much data sent", -1, NULL); |
9442dd57 |
1858 | |
ff3187f6 |
1859 | ssh_free_packet(pkt); |
b185170a |
1860 | } |
1861 | |
1862 | /* |
2e85c969 |
1863 | * Defer an SSH-2 packet. |
b185170a |
1864 | */ |
97ab28d7 |
1865 | static void ssh2_pkt_defer_noqueue(Ssh ssh, struct Packet *pkt, int noignore) |
32874aea |
1866 | { |
97ab28d7 |
1867 | int len; |
1868 | if (ssh->cscipher != NULL && (ssh->cscipher->flags & SSH_CIPHER_IS_CBC) && |
1869 | ssh->deferred_len == 0 && !noignore) { |
1870 | /* |
1871 | * Interpose an SSH_MSG_IGNORE to ensure that user data don't |
1872 | * get encrypted with a known IV. |
1873 | */ |
1874 | struct Packet *ipkt = ssh2_pkt_init(SSH2_MSG_IGNORE); |
27311cc7 |
1875 | ssh2_pkt_addstring_start(ipkt); |
97ab28d7 |
1876 | ssh2_pkt_defer_noqueue(ssh, ipkt, TRUE); |
1877 | } |
1878 | len = ssh2_pkt_construct(ssh, pkt); |
51470298 |
1879 | if (ssh->deferred_len + len > ssh->deferred_size) { |
1880 | ssh->deferred_size = ssh->deferred_len + len + 128; |
3d88e64d |
1881 | ssh->deferred_send_data = sresize(ssh->deferred_send_data, |
1882 | ssh->deferred_size, |
1883 | unsigned char); |
b185170a |
1884 | } |
ff3187f6 |
1885 | memcpy(ssh->deferred_send_data + ssh->deferred_len, pkt->data, len); |
51470298 |
1886 | ssh->deferred_len += len; |
9442dd57 |
1887 | ssh->deferred_data_size += pkt->encrypted_len; |
ff3187f6 |
1888 | ssh_free_packet(pkt); |
b185170a |
1889 | } |
1890 | |
1891 | /* |
2e85c969 |
1892 | * Queue an SSH-2 packet. |
590f6a5f |
1893 | */ |
1894 | static void ssh2_pkt_queue(Ssh ssh, struct Packet *pkt) |
1895 | { |
1896 | assert(ssh->queueing); |
1897 | |
1898 | if (ssh->queuelen >= ssh->queuesize) { |
1899 | ssh->queuesize = ssh->queuelen + 32; |
1900 | ssh->queue = sresize(ssh->queue, ssh->queuesize, struct Packet *); |
1901 | } |
1902 | |
1903 | ssh->queue[ssh->queuelen++] = pkt; |
1904 | } |
1905 | |
1906 | /* |
1907 | * Either queue or send a packet, depending on whether queueing is |
1908 | * set. |
1909 | */ |
1910 | static void ssh2_pkt_send(Ssh ssh, struct Packet *pkt) |
1911 | { |
1912 | if (ssh->queueing) |
1913 | ssh2_pkt_queue(ssh, pkt); |
1914 | else |
1915 | ssh2_pkt_send_noqueue(ssh, pkt); |
1916 | } |
1917 | |
1918 | /* |
1919 | * Either queue or defer a packet, depending on whether queueing is |
1920 | * set. |
1921 | */ |
1922 | static void ssh2_pkt_defer(Ssh ssh, struct Packet *pkt) |
1923 | { |
1924 | if (ssh->queueing) |
1925 | ssh2_pkt_queue(ssh, pkt); |
1926 | else |
97ab28d7 |
1927 | ssh2_pkt_defer_noqueue(ssh, pkt, FALSE); |
590f6a5f |
1928 | } |
1929 | |
1930 | /* |
b185170a |
1931 | * Send the whole deferred data block constructed by |
2e85c969 |
1932 | * ssh2_pkt_defer() or SSH-1's defer_packet(). |
590f6a5f |
1933 | * |
1934 | * The expected use of the defer mechanism is that you call |
1935 | * ssh2_pkt_defer() a few times, then call ssh_pkt_defersend(). If |
1936 | * not currently queueing, this simply sets up deferred_send_data |
1937 | * and then sends it. If we _are_ currently queueing, the calls to |
1938 | * ssh2_pkt_defer() put the deferred packets on to the queue |
1939 | * instead, and therefore ssh_pkt_defersend() has no deferred data |
1940 | * to send. Hence, there's no need to make it conditional on |
1941 | * ssh->queueing. |
b185170a |
1942 | */ |
51470298 |
1943 | static void ssh_pkt_defersend(Ssh ssh) |
32874aea |
1944 | { |
5471d09a |
1945 | int backlog; |
bf8a49a1 |
1946 | backlog = s_write(ssh, ssh->deferred_send_data, ssh->deferred_len); |
51470298 |
1947 | ssh->deferred_len = ssh->deferred_size = 0; |
1948 | sfree(ssh->deferred_send_data); |
1949 | ssh->deferred_send_data = NULL; |
5471d09a |
1950 | if (backlog > SSH_MAX_BACKLOG) |
51470298 |
1951 | ssh_throttle_all(ssh, 1, backlog); |
9442dd57 |
1952 | |
1953 | ssh->outgoing_data_size += ssh->deferred_data_size; |
1954 | if (!ssh->kex_in_progress && |
d57f70af |
1955 | ssh->max_data_size != 0 && |
1956 | ssh->outgoing_data_size > ssh->max_data_size) |
f382c87d |
1957 | do_ssh2_transport(ssh, "too much data sent", -1, NULL); |
9442dd57 |
1958 | ssh->deferred_data_size = 0; |
7cca0d81 |
1959 | } |
1960 | |
590f6a5f |
1961 | /* |
18524056 |
1962 | * Send a packet whose length needs to be disguised (typically |
1963 | * passwords or keyboard-interactive responses). |
1964 | */ |
1965 | static void ssh2_pkt_send_with_padding(Ssh ssh, struct Packet *pkt, |
1966 | int padsize) |
1967 | { |
1968 | #if 0 |
1969 | if (0) { |
1970 | /* |
1971 | * The simplest way to do this is to adjust the |
1972 | * variable-length padding field in the outgoing packet. |
1973 | * |
1974 | * Currently compiled out, because some Cisco SSH servers |
1975 | * don't like excessively padded packets (bah, why's it |
1976 | * always Cisco?) |
1977 | */ |
1978 | pkt->forcepad = padsize; |
1979 | ssh2_pkt_send(ssh, pkt); |
1980 | } else |
1981 | #endif |
1982 | { |
1983 | /* |
1984 | * If we can't do that, however, an alternative approach is |
1985 | * to use the pkt_defer mechanism to bundle the packet |
1986 | * tightly together with an SSH_MSG_IGNORE such that their |
1987 | * combined length is a constant. So first we construct the |
1988 | * final form of this packet and defer its sending. |
1989 | */ |
1990 | ssh2_pkt_defer(ssh, pkt); |
1991 | |
1992 | /* |
1993 | * Now construct an SSH_MSG_IGNORE which includes a string |
1994 | * that's an exact multiple of the cipher block size. (If |
1995 | * the cipher is NULL so that the block size is |
1996 | * unavailable, we don't do this trick at all, because we |
1997 | * gain nothing by it.) |
1998 | */ |
1999 | if (ssh->cscipher) { |
2000 | int stringlen, i; |
2001 | |
2002 | stringlen = (256 - ssh->deferred_len); |
2003 | stringlen += ssh->cscipher->blksize - 1; |
2004 | stringlen -= (stringlen % ssh->cscipher->blksize); |
2005 | if (ssh->cscomp) { |
2006 | /* |
2007 | * Temporarily disable actual compression, so we |
2008 | * can guarantee to get this string exactly the |
2009 | * length we want it. The compression-disabling |
2010 | * routine should return an integer indicating how |
2011 | * many bytes we should adjust our string length |
2012 | * by. |
2013 | */ |
2014 | stringlen -= |
2015 | ssh->cscomp->disable_compression(ssh->cs_comp_ctx); |
2016 | } |
2017 | pkt = ssh2_pkt_init(SSH2_MSG_IGNORE); |
2018 | ssh2_pkt_addstring_start(pkt); |
2019 | for (i = 0; i < stringlen; i++) { |
2020 | char c = (char) random_byte(); |
2021 | ssh2_pkt_addstring_data(pkt, &c, 1); |
2022 | } |
2023 | ssh2_pkt_defer(ssh, pkt); |
2024 | } |
2025 | ssh_pkt_defersend(ssh); |
2026 | } |
2027 | } |
2028 | |
2029 | /* |
2e85c969 |
2030 | * Send all queued SSH-2 packets. We send them by means of |
590f6a5f |
2031 | * ssh2_pkt_defer_noqueue(), in case they included a pair of |
2032 | * packets that needed to be lumped together. |
2033 | */ |
2034 | static void ssh2_pkt_queuesend(Ssh ssh) |
2035 | { |
2036 | int i; |
2037 | |
2038 | assert(!ssh->queueing); |
2039 | |
2040 | for (i = 0; i < ssh->queuelen; i++) |
97ab28d7 |
2041 | ssh2_pkt_defer_noqueue(ssh, ssh->queue[i], FALSE); |
590f6a5f |
2042 | ssh->queuelen = 0; |
2043 | |
2044 | ssh_pkt_defersend(ssh); |
2045 | } |
2046 | |
7cca0d81 |
2047 | #if 0 |
32874aea |
2048 | void bndebug(char *string, Bignum b) |
2049 | { |
7cca0d81 |
2050 | unsigned char *p; |
2051 | int i, len; |
2052 | p = ssh2_mpint_fmt(b, &len); |
2053 | debug(("%s", string)); |
2054 | for (i = 0; i < len; i++) |
32874aea |
2055 | debug((" %02x", p[i])); |
765c4200 |
2056 | debug(("\n")); |
dcbde236 |
2057 | sfree(p); |
7cca0d81 |
2058 | } |
2059 | #endif |
2060 | |
b672f405 |
2061 | static void hash_mpint(const struct ssh_hash *h, void *s, Bignum b) |
32874aea |
2062 | { |
7cca0d81 |
2063 | unsigned char *p; |
2064 | int len; |
2065 | p = ssh2_mpint_fmt(b, &len); |
b672f405 |
2066 | hash_string(h, s, p, len); |
dcbde236 |
2067 | sfree(p); |
7cca0d81 |
2068 | } |
2069 | |
2070 | /* |
2e85c969 |
2071 | * Packet decode functions for both SSH-1 and SSH-2. |
7cca0d81 |
2072 | */ |
ff3187f6 |
2073 | static unsigned long ssh_pkt_getuint32(struct Packet *pkt) |
32874aea |
2074 | { |
7cca0d81 |
2075 | unsigned long value; |
ff3187f6 |
2076 | if (pkt->length - pkt->savedpos < 4) |
32874aea |
2077 | return 0; /* arrgh, no way to decline (FIXME?) */ |
ff3187f6 |
2078 | value = GET_32BIT(pkt->body + pkt->savedpos); |
2079 | pkt->savedpos += 4; |
7cca0d81 |
2080 | return value; |
2081 | } |
ff3187f6 |
2082 | static int ssh2_pkt_getbool(struct Packet *pkt) |
32874aea |
2083 | { |
65a22376 |
2084 | unsigned long value; |
ff3187f6 |
2085 | if (pkt->length - pkt->savedpos < 1) |
32874aea |
2086 | return 0; /* arrgh, no way to decline (FIXME?) */ |
ff3187f6 |
2087 | value = pkt->body[pkt->savedpos] != 0; |
2088 | pkt->savedpos++; |
65a22376 |
2089 | return value; |
2090 | } |
ff3187f6 |
2091 | static void ssh_pkt_getstring(struct Packet *pkt, char **p, int *length) |
32874aea |
2092 | { |
57356d63 |
2093 | int len; |
7cca0d81 |
2094 | *p = NULL; |
45068b27 |
2095 | *length = 0; |
ff3187f6 |
2096 | if (pkt->length - pkt->savedpos < 4) |
32874aea |
2097 | return; |
ff3187f6 |
2098 | len = GET_32BIT(pkt->body + pkt->savedpos); |
57356d63 |
2099 | if (len < 0) |
2100 | return; |
2101 | *length = len; |
ff3187f6 |
2102 | pkt->savedpos += 4; |
2103 | if (pkt->length - pkt->savedpos < *length) |
32874aea |
2104 | return; |
ff3187f6 |
2105 | *p = (char *)(pkt->body + pkt->savedpos); |
2106 | pkt->savedpos += *length; |
7cca0d81 |
2107 | } |
ff3187f6 |
2108 | static void *ssh_pkt_getdata(struct Packet *pkt, int length) |
0016d70b |
2109 | { |
ff3187f6 |
2110 | if (pkt->length - pkt->savedpos < length) |
0016d70b |
2111 | return NULL; |
ff3187f6 |
2112 | pkt->savedpos += length; |
2113 | return pkt->body + (pkt->savedpos - length); |
0016d70b |
2114 | } |
ff3187f6 |
2115 | static int ssh1_pkt_getrsakey(struct Packet *pkt, struct RSAKey *key, |
0016d70b |
2116 | unsigned char **keystr) |
2117 | { |
2118 | int j; |
2119 | |
ff3187f6 |
2120 | j = makekey(pkt->body + pkt->savedpos, |
2121 | pkt->length - pkt->savedpos, |
0016d70b |
2122 | key, keystr, 0); |
2123 | |
2124 | if (j < 0) |
2125 | return FALSE; |
2126 | |
ff3187f6 |
2127 | pkt->savedpos += j; |
2128 | assert(pkt->savedpos < pkt->length); |
0016d70b |
2129 | |
2130 | return TRUE; |
2131 | } |
ff3187f6 |
2132 | static Bignum ssh1_pkt_getmp(struct Packet *pkt) |
0016d70b |
2133 | { |
2134 | int j; |
2135 | Bignum b; |
2136 | |
ff3187f6 |
2137 | j = ssh1_read_bignum(pkt->body + pkt->savedpos, |
2138 | pkt->length - pkt->savedpos, &b); |
0016d70b |
2139 | |
2140 | if (j < 0) |
2141 | return NULL; |
2142 | |
ff3187f6 |
2143 | pkt->savedpos += j; |
0016d70b |
2144 | return b; |
2145 | } |
ff3187f6 |
2146 | static Bignum ssh2_pkt_getmp(struct Packet *pkt) |
32874aea |
2147 | { |
7cca0d81 |
2148 | char *p; |
3709bfe9 |
2149 | int length; |
7cca0d81 |
2150 | Bignum b; |
2151 | |
ff3187f6 |
2152 | ssh_pkt_getstring(pkt, &p, &length); |
7cca0d81 |
2153 | if (!p) |
32874aea |
2154 | return NULL; |
ff3187f6 |
2155 | if (p[0] & 0x80) |
32874aea |
2156 | return NULL; |
d8baa528 |
2157 | b = bignum_from_bytes((unsigned char *)p, length); |
7cca0d81 |
2158 | return b; |
2159 | } |
2160 | |
7d503c31 |
2161 | /* |
2e85c969 |
2162 | * Helper function to add an SSH-2 signature blob to a packet. |
1dd353b5 |
2163 | * Expects to be shown the public key blob as well as the signature |
2164 | * blob. Normally works just like ssh2_pkt_addstring, but will |
2165 | * fiddle with the signature packet if necessary for |
2166 | * BUG_SSH2_RSA_PADDING. |
2167 | */ |
ff3187f6 |
2168 | static void ssh2_add_sigblob(Ssh ssh, struct Packet *pkt, |
2169 | void *pkblob_v, int pkblob_len, |
1dd353b5 |
2170 | void *sigblob_v, int sigblob_len) |
2171 | { |
2172 | unsigned char *pkblob = (unsigned char *)pkblob_v; |
2173 | unsigned char *sigblob = (unsigned char *)sigblob_v; |
2174 | |
2175 | /* dmemdump(pkblob, pkblob_len); */ |
2176 | /* dmemdump(sigblob, sigblob_len); */ |
2177 | |
2178 | /* |
2179 | * See if this is in fact an ssh-rsa signature and a buggy |
2180 | * server; otherwise we can just do this the easy way. |
2181 | */ |
51470298 |
2182 | if ((ssh->remote_bugs & BUG_SSH2_RSA_PADDING) && |
1dd353b5 |
2183 | (GET_32BIT(pkblob) == 7 && !memcmp(pkblob+4, "ssh-rsa", 7))) { |
2184 | int pos, len, siglen; |
2185 | |
2186 | /* |
2187 | * Find the byte length of the modulus. |
2188 | */ |
2189 | |
2190 | pos = 4+7; /* skip over "ssh-rsa" */ |
2191 | pos += 4 + GET_32BIT(pkblob+pos); /* skip over exponent */ |
2192 | len = GET_32BIT(pkblob+pos); /* find length of modulus */ |
2193 | pos += 4; /* find modulus itself */ |
2194 | while (len > 0 && pkblob[pos] == 0) |
2195 | len--, pos++; |
2196 | /* debug(("modulus length is %d\n", len)); */ |
2197 | |
2198 | /* |
2199 | * Now find the signature integer. |
2200 | */ |
2201 | pos = 4+7; /* skip over "ssh-rsa" */ |
2202 | siglen = GET_32BIT(sigblob+pos); |
2203 | /* debug(("signature length is %d\n", siglen)); */ |
2204 | |
2205 | if (len != siglen) { |
2206 | unsigned char newlen[4]; |
ff3187f6 |
2207 | ssh2_pkt_addstring_start(pkt); |
2208 | ssh2_pkt_addstring_data(pkt, (char *)sigblob, pos); |
1dd353b5 |
2209 | /* dmemdump(sigblob, pos); */ |
2210 | pos += 4; /* point to start of actual sig */ |
2211 | PUT_32BIT(newlen, len); |
ff3187f6 |
2212 | ssh2_pkt_addstring_data(pkt, (char *)newlen, 4); |
1dd353b5 |
2213 | /* dmemdump(newlen, 4); */ |
2214 | newlen[0] = 0; |
2215 | while (len-- > siglen) { |
ff3187f6 |
2216 | ssh2_pkt_addstring_data(pkt, (char *)newlen, 1); |
1dd353b5 |
2217 | /* dmemdump(newlen, 1); */ |
2218 | } |
ff3187f6 |
2219 | ssh2_pkt_addstring_data(pkt, (char *)(sigblob+pos), siglen); |
1dd353b5 |
2220 | /* dmemdump(sigblob+pos, siglen); */ |
2221 | return; |
2222 | } |
2223 | |
2224 | /* Otherwise fall through and do it the easy way. */ |
2225 | } |
2226 | |
ff3187f6 |
2227 | ssh2_pkt_addstring_start(pkt); |
2228 | ssh2_pkt_addstring_data(pkt, (char *)sigblob, sigblob_len); |
1dd353b5 |
2229 | } |
2230 | |
2231 | /* |
7d503c31 |
2232 | * Examine the remote side's version string and compare it against |
2233 | * a list of known buggy implementations. |
2234 | */ |
51470298 |
2235 | static void ssh_detect_bugs(Ssh ssh, char *vstring) |
32874aea |
2236 | { |
2237 | char *imp; /* pointer to implementation part */ |
7d503c31 |
2238 | imp = vstring; |
2239 | imp += strcspn(imp, "-"); |
bd358db1 |
2240 | if (*imp) imp++; |
7d503c31 |
2241 | imp += strcspn(imp, "-"); |
bd358db1 |
2242 | if (*imp) imp++; |
7d503c31 |
2243 | |
51470298 |
2244 | ssh->remote_bugs = 0; |
7d503c31 |
2245 | |
bf982899 |
2246 | /* |
2247 | * General notes on server version strings: |
2248 | * - Not all servers reporting "Cisco-1.25" have all the bugs listed |
2249 | * here -- in particular, we've heard of one that's perfectly happy |
2250 | * with SSH1_MSG_IGNOREs -- but this string never seems to change, |
2251 | * so we can't distinguish them. |
2252 | */ |
5ecd7ad0 |
2253 | if (ssh->cfg.sshbug_ignore1 == FORCE_ON || |
2254 | (ssh->cfg.sshbug_ignore1 == AUTO && |
2c9c6388 |
2255 | (!strcmp(imp, "1.2.18") || !strcmp(imp, "1.2.19") || |
2256 | !strcmp(imp, "1.2.20") || !strcmp(imp, "1.2.21") || |
46ac09aa |
2257 | !strcmp(imp, "1.2.22") || !strcmp(imp, "Cisco-1.25") || |
bd0b4caf |
2258 | !strcmp(imp, "OSU_1.4alpha3") || !strcmp(imp, "OSU_1.5alpha4")))) { |
32874aea |
2259 | /* |
2260 | * These versions don't support SSH1_MSG_IGNORE, so we have |
2261 | * to use a different defence against password length |
2262 | * sniffing. |
2263 | */ |
51470298 |
2264 | ssh->remote_bugs |= BUG_CHOKES_ON_SSH1_IGNORE; |
2e85c969 |
2265 | logevent("We believe remote version has SSH-1 ignore bug"); |
7d503c31 |
2266 | } |
2267 | |
5ecd7ad0 |
2268 | if (ssh->cfg.sshbug_plainpw1 == FORCE_ON || |
2269 | (ssh->cfg.sshbug_plainpw1 == AUTO && |
46ac09aa |
2270 | (!strcmp(imp, "Cisco-1.25") || !strcmp(imp, "OSU_1.4alpha3")))) { |
bd358db1 |
2271 | /* |
2272 | * These versions need a plain password sent; they can't |
2273 | * handle having a null and a random length of data after |
2274 | * the password. |
2275 | */ |
51470298 |
2276 | ssh->remote_bugs |= BUG_NEEDS_SSH1_PLAIN_PASSWORD; |
2e85c969 |
2277 | logevent("We believe remote version needs a plain SSH-1 password"); |
bd358db1 |
2278 | } |
2279 | |
5ecd7ad0 |
2280 | if (ssh->cfg.sshbug_rsa1 == FORCE_ON || |
2281 | (ssh->cfg.sshbug_rsa1 == AUTO && |
2c9c6388 |
2282 | (!strcmp(imp, "Cisco-1.25")))) { |
0df73905 |
2283 | /* |
2284 | * These versions apparently have no clue whatever about |
2285 | * RSA authentication and will panic and die if they see |
2286 | * an AUTH_RSA message. |
2287 | */ |
51470298 |
2288 | ssh->remote_bugs |= BUG_CHOKES_ON_RSA; |
19f47a7d |
2289 | logevent("We believe remote version can't handle SSH-1 RSA authentication"); |
0df73905 |
2290 | } |
2291 | |
5ecd7ad0 |
2292 | if (ssh->cfg.sshbug_hmac2 == FORCE_ON || |
2293 | (ssh->cfg.sshbug_hmac2 == AUTO && |
b9f387af |
2294 | !wc_match("* VShell", imp) && |
831301f6 |
2295 | (wc_match("2.1.0*", imp) || wc_match("2.0.*", imp) || |
2296 | wc_match("2.2.0*", imp) || wc_match("2.3.0*", imp) || |
2297 | wc_match("2.1 *", imp)))) { |
32874aea |
2298 | /* |
2299 | * These versions have the HMAC bug. |
2300 | */ |
51470298 |
2301 | ssh->remote_bugs |= BUG_SSH2_HMAC; |
2e85c969 |
2302 | logevent("We believe remote version has SSH-2 HMAC bug"); |
7d503c31 |
2303 | } |
1dd353b5 |
2304 | |
5ecd7ad0 |
2305 | if (ssh->cfg.sshbug_derivekey2 == FORCE_ON || |
2306 | (ssh->cfg.sshbug_derivekey2 == AUTO && |
b9f387af |
2307 | !wc_match("* VShell", imp) && |
2856a1b9 |
2308 | (wc_match("2.0.0*", imp) || wc_match("2.0.10*", imp) ))) { |
088bde77 |
2309 | /* |
2310 | * These versions have the key-derivation bug (failing to |
2311 | * include the literal shared secret in the hashes that |
2312 | * generate the keys). |
2313 | */ |
51470298 |
2314 | ssh->remote_bugs |= BUG_SSH2_DERIVEKEY; |
2e85c969 |
2315 | logevent("We believe remote version has SSH-2 key-derivation bug"); |
088bde77 |
2316 | } |
2317 | |
5ecd7ad0 |
2318 | if (ssh->cfg.sshbug_rsapad2 == FORCE_ON || |
2319 | (ssh->cfg.sshbug_rsapad2 == AUTO && |
831301f6 |
2320 | (wc_match("OpenSSH_2.[5-9]*", imp) || |
2321 | wc_match("OpenSSH_3.[0-2]*", imp)))) { |
1dd353b5 |
2322 | /* |
2e85c969 |
2323 | * These versions have the SSH-2 RSA padding bug. |
1dd353b5 |
2324 | */ |
51470298 |
2325 | ssh->remote_bugs |= BUG_SSH2_RSA_PADDING; |
2e85c969 |
2326 | logevent("We believe remote version has SSH-2 RSA padding bug"); |
1dd353b5 |
2327 | } |
8e975795 |
2328 | |
dda87a28 |
2329 | if (ssh->cfg.sshbug_pksessid2 == FORCE_ON || |
2330 | (ssh->cfg.sshbug_pksessid2 == AUTO && |
2331 | wc_match("OpenSSH_2.[0-2]*", imp))) { |
2332 | /* |
2e85c969 |
2333 | * These versions have the SSH-2 session-ID bug in |
dda87a28 |
2334 | * public-key authentication. |
2335 | */ |
2336 | ssh->remote_bugs |= BUG_SSH2_PK_SESSIONID; |
2e85c969 |
2337 | logevent("We believe remote version has SSH-2 public-key-session-ID bug"); |
dda87a28 |
2338 | } |
f382c87d |
2339 | |
2340 | if (ssh->cfg.sshbug_rekey2 == FORCE_ON || |
2341 | (ssh->cfg.sshbug_rekey2 == AUTO && |
39b8712f |
2342 | (wc_match("DigiSSH_2.0", imp) || |
2343 | wc_match("OpenSSH_2.[0-4]*", imp) || |
e12d95a5 |
2344 | wc_match("OpenSSH_2.5.[0-3]*", imp) || |
2345 | wc_match("Sun_SSH_1.0", imp) || |
f4275b53 |
2346 | wc_match("Sun_SSH_1.0.1", imp) || |
96bd26de |
2347 | /* All versions <= 1.2.6 (they changed their format in 1.2.7) */ |
2348 | wc_match("WeOnlyDo-*", imp)))) { |
f382c87d |
2349 | /* |
2e85c969 |
2350 | * These versions have the SSH-2 rekey bug. |
f382c87d |
2351 | */ |
2352 | ssh->remote_bugs |= BUG_SSH2_REKEY; |
2e85c969 |
2353 | logevent("We believe remote version has SSH-2 rekey bug"); |
f382c87d |
2354 | } |
7d503c31 |
2355 | } |
2356 | |
d38d6a1f |
2357 | /* |
2358 | * The `software version' part of an SSH version string is required |
2359 | * to contain no spaces or minus signs. |
2360 | */ |
2361 | static void ssh_fix_verstring(char *str) |
2362 | { |
2363 | /* Eat "SSH-<protoversion>-". */ |
2364 | assert(*str == 'S'); str++; |
2365 | assert(*str == 'S'); str++; |
2366 | assert(*str == 'H'); str++; |
2367 | assert(*str == '-'); str++; |
2368 | while (*str && *str != '-') str++; |
2369 | assert(*str == '-'); str++; |
2370 | |
2371 | /* Convert minus signs and spaces in the remaining string into |
2372 | * underscores. */ |
2373 | while (*str) { |
2374 | if (*str == '-' || *str == ' ') |
2375 | *str = '_'; |
2376 | str++; |
2377 | } |
2378 | } |
2379 | |
1fcd0d98 |
2380 | /* |
2381 | * Send an appropriate SSH version string. |
2382 | */ |
2383 | static void ssh_send_verstring(Ssh ssh, char *svers) |
2384 | { |
2385 | char *verstring; |
2386 | |
2387 | if (ssh->version == 2) { |
2388 | /* |
2389 | * Construct a v2 version string. |
2390 | */ |
2391 | verstring = dupprintf("SSH-2.0-%s\015\012", sshver); |
2392 | } else { |
2393 | /* |
2394 | * Construct a v1 version string. |
2395 | */ |
2396 | verstring = dupprintf("SSH-%s-%s\012", |
2397 | (ssh_versioncmp(svers, "1.5") <= 0 ? |
2398 | svers : "1.5"), |
2399 | sshver); |
2400 | } |
2401 | |
2402 | ssh_fix_verstring(verstring); |
2403 | |
2404 | if (ssh->version == 2) { |
2405 | size_t len; |
2406 | /* |
2407 | * Record our version string. |
2408 | */ |
2409 | len = strcspn(verstring, "\015\012"); |
2410 | ssh->v_c = snewn(len + 1, char); |
2411 | memcpy(ssh->v_c, verstring, len); |
2412 | ssh->v_c[len] = 0; |
2413 | } |
2414 | |
2415 | logeventf(ssh, "We claim version: %.*s", |
2416 | strcspn(verstring, "\015\012"), verstring); |
2417 | s_write(ssh, verstring, strlen(verstring)); |
2418 | sfree(verstring); |
2419 | } |
2420 | |
51470298 |
2421 | static int do_ssh_init(Ssh ssh, unsigned char c) |
32874aea |
2422 | { |
51470298 |
2423 | struct do_ssh_init_state { |
2424 | int vslen; |
2425 | char version[10]; |
2426 | char *vstring; |
2427 | int vstrsize; |
2428 | int i; |
2429 | int proto1, proto2; |
2430 | }; |
2431 | crState(do_ssh_init_state); |
374330e2 |
2432 | |
51470298 |
2433 | crBegin(ssh->do_ssh_init_crstate); |
8df7a775 |
2434 | |
1fcd0d98 |
2435 | /* |
2436 | * If the SSH version number's fixed, set it now, and if it's SSH-2, |
2437 | * send the version string too. |
2438 | * |
2439 | * XXX This isn't actually early enough to be useful, since we only |
2440 | * get here when the first incoming byte turns up. |
2441 | */ |
2442 | if (ssh->cfg.sshprot == 0) |
2443 | ssh->version = 1; |
2444 | if (ssh->cfg.sshprot == 3) { |
2445 | ssh->version = 2; |
2446 | ssh_send_verstring(ssh, NULL); |
2447 | } |
2448 | |
8c1835c0 |
2449 | /* Search for a line beginning with the string "SSH-" in the input. */ |
2450 | for (;;) { |
2451 | if (c != 'S') goto no; |
2452 | crReturn(1); |
2453 | if (c != 'S') goto no; |
2454 | crReturn(1); |
2455 | if (c != 'H') goto no; |
2456 | crReturn(1); |
2457 | if (c != '-') goto no; |
2458 | break; |
2459 | no: |
2460 | while (c != '\012') |
2461 | crReturn(1); |
2462 | crReturn(1); |
374330e2 |
2463 | } |
8df7a775 |
2464 | |
51470298 |
2465 | s->vstrsize = 16; |
3d88e64d |
2466 | s->vstring = snewn(s->vstrsize, char); |
51470298 |
2467 | strcpy(s->vstring, "SSH-"); |
2468 | s->vslen = 4; |
2469 | s->i = 0; |
374330e2 |
2470 | while (1) { |
8df7a775 |
2471 | crReturn(1); /* get another char */ |
51470298 |
2472 | if (s->vslen >= s->vstrsize - 1) { |
2473 | s->vstrsize += 16; |
3d88e64d |
2474 | s->vstring = sresize(s->vstring, s->vstrsize, char); |
32874aea |
2475 | } |
51470298 |
2476 | s->vstring[s->vslen++] = c; |
2477 | if (s->i >= 0) { |
374330e2 |
2478 | if (c == '-') { |
51470298 |
2479 | s->version[s->i] = '\0'; |
2480 | s->i = -1; |
2481 | } else if (s->i < sizeof(s->version) - 1) |
2482 | s->version[s->i++] = c; |
c4ffc4d0 |
2483 | } else if (c == '\012') |
374330e2 |
2484 | break; |
2485 | } |
2486 | |
51470298 |
2487 | ssh->agentfwd_enabled = FALSE; |
2488 | ssh->rdpkt2_state.incoming_sequence = 0; |
960e736a |
2489 | |
51470298 |
2490 | s->vstring[s->vslen] = 0; |
a7d4653a |
2491 | s->vstring[strcspn(s->vstring, "\015\012")] = '\0';/* remove EOL chars */ |
fb983202 |
2492 | logeventf(ssh, "Server version: %s", s->vstring); |
51470298 |
2493 | ssh_detect_bugs(ssh, s->vstring); |
c5e9c988 |
2494 | |
adf799dd |
2495 | /* |
38d228a2 |
2496 | * Decide which SSH protocol version to support. |
adf799dd |
2497 | */ |
38d228a2 |
2498 | |
2499 | /* Anything strictly below "2.0" means protocol 1 is supported. */ |
51470298 |
2500 | s->proto1 = ssh_versioncmp(s->version, "2.0") < 0; |
38d228a2 |
2501 | /* Anything greater or equal to "1.99" means protocol 2 is supported. */ |
51470298 |
2502 | s->proto2 = ssh_versioncmp(s->version, "1.99") >= 0; |
38d228a2 |
2503 | |
86916870 |
2504 | if (ssh->cfg.sshprot == 0 && !s->proto1) { |
6b5cf8b4 |
2505 | bombout(("SSH protocol version 1 required by user but not provided by server")); |
7ffdbc1a |
2506 | crStop(0); |
38d228a2 |
2507 | } |
86916870 |
2508 | if (ssh->cfg.sshprot == 3 && !s->proto2) { |
6b5cf8b4 |
2509 | bombout(("SSH protocol version 2 required by user but not provided by server")); |
7ffdbc1a |
2510 | crStop(0); |
38d228a2 |
2511 | } |
2512 | |
1fcd0d98 |
2513 | if (s->proto2 && (ssh->cfg.sshprot >= 2 || !s->proto1)) |
2514 | ssh->version = 2; |
2515 | else |
2516 | ssh->version = 1; |
d38d6a1f |
2517 | |
2518 | logeventf(ssh, "Using SSH protocol version %d", ssh->version); |
2519 | |
1fcd0d98 |
2520 | /* Send the version string, if we haven't already */ |
2521 | if (ssh->cfg.sshprot != 3) |
2522 | ssh_send_verstring(ssh, s->version); |
2523 | |
2524 | if (ssh->version == 2) { |
2525 | size_t len; |
2526 | /* |
2527 | * Record their version string. |
2528 | */ |
2529 | len = strcspn(s->vstring, "\015\012"); |
2530 | ssh->v_s = snewn(len + 1, char); |
2531 | memcpy(ssh->v_s, s->vstring, len); |
2532 | ssh->v_s[len] = 0; |
2533 | |
2534 | /* |
2535 | * Initialise SSH-2 protocol. |
2536 | */ |
2537 | ssh->protocol = ssh2_protocol; |
2538 | ssh2_protocol_setup(ssh); |
2539 | ssh->s_rdpkt = ssh2_rdpkt; |
2540 | } else { |
2541 | /* |
2542 | * Initialise SSH-1 protocol. |
2543 | */ |
2544 | ssh->protocol = ssh1_protocol; |
2545 | ssh1_protocol_setup(ssh); |
2546 | ssh->s_rdpkt = ssh1_rdpkt; |
2547 | } |
2548 | if (ssh->version == 2) |
2549 | do_ssh2_transport(ssh, NULL, -1, NULL); |
2550 | |
125105d1 |
2551 | update_specials_menu(ssh->frontend); |
51470298 |
2552 | ssh->state = SSH_STATE_BEFORE_SIZE; |
39934deb |
2553 | ssh->pinger = pinger_new(&ssh->cfg, &ssh_backend, ssh); |
8df7a775 |
2554 | |
51470298 |
2555 | sfree(s->vstring); |
50526e47 |
2556 | |
8df7a775 |
2557 | crFinish(0); |
2558 | } |
2559 | |
3d9449a1 |
2560 | static void ssh_process_incoming_data(Ssh ssh, |
2561 | unsigned char **data, int *datalen) |
2562 | { |
bf8a49a1 |
2563 | struct Packet *pktin; |
2564 | |
2565 | pktin = ssh->s_rdpkt(ssh, data, datalen); |
3d9449a1 |
2566 | if (pktin) { |
2567 | ssh->protocol(ssh, NULL, 0, pktin); |
2568 | ssh_free_packet(pktin); |
2569 | } |
2570 | } |
2571 | |
2572 | static void ssh_queue_incoming_data(Ssh ssh, |
2573 | unsigned char **data, int *datalen) |
2574 | { |
2575 | bufchain_add(&ssh->queued_incoming_data, *data, *datalen); |
2576 | *data += *datalen; |
2577 | *datalen = 0; |
2578 | } |
2579 | |
2580 | static void ssh_process_queued_incoming_data(Ssh ssh) |
2581 | { |
2582 | void *vdata; |
2583 | unsigned char *data; |
2584 | int len, origlen; |
2585 | |
2586 | while (!ssh->frozen && bufchain_size(&ssh->queued_incoming_data)) { |
2587 | bufchain_prefix(&ssh->queued_incoming_data, &vdata, &len); |
2588 | data = vdata; |
2589 | origlen = len; |
2590 | |
2591 | while (!ssh->frozen && len > 0) |
2592 | ssh_process_incoming_data(ssh, &data, &len); |
2593 | |
2594 | if (origlen > len) |
2595 | bufchain_consume(&ssh->queued_incoming_data, origlen - len); |
2596 | } |
2597 | } |
2598 | |
2599 | static void ssh_set_frozen(Ssh ssh, int frozen) |
2600 | { |
a5a6f839 |
2601 | if (ssh->s) |
2602 | sk_set_frozen(ssh->s, frozen); |
3d9449a1 |
2603 | ssh->frozen = frozen; |
2604 | } |
2605 | |
51470298 |
2606 | static void ssh_gotdata(Ssh ssh, unsigned char *data, int datalen) |
8df7a775 |
2607 | { |
bf8a49a1 |
2608 | /* Log raw data, if we're in that mode. */ |
2609 | log_packet(ssh->logctx, PKT_INCOMING, -1, NULL, data, datalen, 0, NULL); |
2610 | |
51470298 |
2611 | crBegin(ssh->ssh_gotdata_crstate); |
8df7a775 |
2612 | |
2613 | /* |
2614 | * To begin with, feed the characters one by one to the |
2615 | * protocol initialisation / selection function do_ssh_init(). |
2616 | * When that returns 0, we're done with the initial greeting |
2617 | * exchange and can move on to packet discipline. |
2618 | */ |
2619 | while (1) { |
51470298 |
2620 | int ret; /* need not be kept across crReturn */ |
8df7a775 |
2621 | if (datalen == 0) |
2622 | crReturnV; /* more data please */ |
51470298 |
2623 | ret = do_ssh_init(ssh, *data); |
32874aea |
2624 | data++; |
2625 | datalen--; |
8df7a775 |
2626 | if (ret == 0) |
2627 | break; |
2628 | } |
2629 | |
2630 | /* |
2631 | * We emerge from that loop when the initial negotiation is |
2632 | * over and we have selected an s_rdpkt function. Now pass |
2633 | * everything to s_rdpkt, and then pass the resulting packets |
2634 | * to the proper protocol handler. |
2635 | */ |
3d9449a1 |
2636 | |
8df7a775 |
2637 | while (1) { |
e375106c |
2638 | while (bufchain_size(&ssh->queued_incoming_data) > 0 || datalen > 0) { |
2639 | if (ssh->frozen) { |
3d9449a1 |
2640 | ssh_queue_incoming_data(ssh, &data, &datalen); |
e375106c |
2641 | /* This uses up all data and cannot cause anything interesting |
2642 | * to happen; indeed, for anything to happen at all, we must |
2643 | * return, so break out. */ |
2644 | break; |
2645 | } else if (bufchain_size(&ssh->queued_incoming_data) > 0) { |
2646 | /* This uses up some or all data, and may freeze the |
2647 | * session. */ |
2648 | ssh_process_queued_incoming_data(ssh); |
2649 | } else { |
2650 | /* This uses up some or all data, and may freeze the |
2651 | * session. */ |
2652 | ssh_process_incoming_data(ssh, &data, &datalen); |
2653 | } |
2654 | /* FIXME this is probably EBW. */ |
ff3187f6 |
2655 | if (ssh->state == SSH_STATE_CLOSED) |
2656 | return; |
8df7a775 |
2657 | } |
e375106c |
2658 | /* We're out of data. Go and get some more. */ |
8df7a775 |
2659 | crReturnV; |
2660 | } |
2661 | crFinishV; |
2662 | } |
2663 | |
ac934965 |
2664 | static int ssh_do_close(Ssh ssh, int notify_exit) |
32874aea |
2665 | { |
80ffa58b |
2666 | int ret = 0; |
36f94d1f |
2667 | struct ssh_channel *c; |
2668 | |
51470298 |
2669 | ssh->state = SSH_STATE_CLOSED; |
ecbb0000 |
2670 | expire_timer_context(ssh); |
51470298 |
2671 | if (ssh->s) { |
2672 | sk_close(ssh->s); |
2673 | ssh->s = NULL; |
ac934965 |
2674 | if (notify_exit) |
2675 | notify_remote_exit(ssh->frontend); |
2676 | else |
2677 | ret = 1; |
f3ab576e |
2678 | } |
36f94d1f |
2679 | /* |
80ffa58b |
2680 | * Now we must shut down any port- and X-forwarded channels going |
36f94d1f |
2681 | * through this connection. |
2682 | */ |
74a98066 |
2683 | if (ssh->channels) { |
80ffa58b |
2684 | while (NULL != (c = index234(ssh->channels, 0))) { |
74a98066 |
2685 | switch (c->type) { |
2686 | case CHAN_X11: |
2687 | x11_close(c->u.x11.s); |
2688 | break; |
2689 | case CHAN_SOCKDATA: |
2690 | pfd_close(c->u.pfd.s); |
2691 | break; |
2692 | } |
80ffa58b |
2693 | del234(ssh->channels, c); /* moving next one to index 0 */ |
74a98066 |
2694 | if (ssh->version == 2) |
2695 | bufchain_clear(&c->v.v2.outbuffer); |
2696 | sfree(c); |
36f94d1f |
2697 | } |
36f94d1f |
2698 | } |
f8c9f9df |
2699 | /* |
2700 | * Go through port-forwardings, and close any associated |
2701 | * listening sockets. |
2702 | */ |
2703 | if (ssh->portfwds) { |
2704 | struct ssh_portfwd *pf; |
2705 | while (NULL != (pf = index234(ssh->portfwds, 0))) { |
2706 | /* Dispose of any listening socket. */ |
2707 | if (pf->local) |
2708 | pfd_terminate(pf->local); |
2709 | del234(ssh->portfwds, pf); /* moving next one to index 0 */ |
2710 | free_portfwd(pf); |
2711 | } |
2712 | } |
ac934965 |
2713 | |
2714 | return ret; |
36f94d1f |
2715 | } |
2716 | |
7555d6a5 |
2717 | static void ssh_log(Plug plug, int type, SockAddr addr, int port, |
2718 | const char *error_msg, int error_code) |
2719 | { |
2720 | Ssh ssh = (Ssh) plug; |
2721 | char addrbuf[256], *msg; |
2722 | |
2723 | sk_getaddr(addr, addrbuf, lenof(addrbuf)); |
2724 | |
2725 | if (type == 0) |
2726 | msg = dupprintf("Connecting to %s port %d", addrbuf, port); |
2727 | else |
2728 | msg = dupprintf("Failed to connect to %s: %s", addrbuf, error_msg); |
2729 | |
2730 | logevent(msg); |
fb983202 |
2731 | sfree(msg); |
7555d6a5 |
2732 | } |
2733 | |
cbe2d68f |
2734 | static int ssh_closing(Plug plug, const char *error_msg, int error_code, |
36f94d1f |
2735 | int calling_back) |
2736 | { |
2737 | Ssh ssh = (Ssh) plug; |
ac934965 |
2738 | int need_notify = ssh_do_close(ssh, FALSE); |
2739 | |
9e296bfa |
2740 | if (!error_msg) { |
2741 | if (!ssh->close_expected) |
2742 | error_msg = "Server unexpectedly closed network connection"; |
2743 | else |
2744 | error_msg = "Server closed network connection"; |
ac934965 |
2745 | } |
2746 | |
d051d1b4 |
2747 | if (ssh->close_expected && ssh->clean_exit && ssh->exitcode < 0) |
2748 | ssh->exitcode = 0; |
2749 | |
2425184b |
2750 | if (need_notify) |
2751 | notify_remote_exit(ssh->frontend); |
2752 | |
9e296bfa |
2753 | if (error_msg) |
247308b5 |
2754 | logevent(error_msg); |
9e296bfa |
2755 | if (!ssh->close_expected || !ssh->clean_exit) |
971bcc0a |
2756 | connection_fatal(ssh->frontend, "%s", error_msg); |
7e78000d |
2757 | return 0; |
2758 | } |
2759 | |
32874aea |
2760 | static int ssh_receive(Plug plug, int urgent, char *data, int len) |
2761 | { |
51470298 |
2762 | Ssh ssh = (Ssh) plug; |
d8baa528 |
2763 | ssh_gotdata(ssh, (unsigned char *)data, len); |
51470298 |
2764 | if (ssh->state == SSH_STATE_CLOSED) { |
ac934965 |
2765 | ssh_do_close(ssh, TRUE); |
32874aea |
2766 | return 0; |
3257deae |
2767 | } |
fef97f43 |
2768 | return 1; |
374330e2 |
2769 | } |
2770 | |
5471d09a |
2771 | static void ssh_sent(Plug plug, int bufsize) |
2772 | { |
51470298 |
2773 | Ssh ssh = (Ssh) plug; |
5471d09a |
2774 | /* |
2775 | * If the send backlog on the SSH socket itself clears, we |
2776 | * should unthrottle the whole world if it was throttled. |
2777 | */ |
2778 | if (bufsize < SSH_MAX_BACKLOG) |
51470298 |
2779 | ssh_throttle_all(ssh, 0, bufsize); |
5471d09a |
2780 | } |
2781 | |
fb09bf1c |
2782 | /* |
8df7a775 |
2783 | * Connect to specified host and port. |
2784 | * Returns an error message, or NULL on success. |
6e1ebb76 |
2785 | * Also places the canonical host name into `realhost'. It must be |
2786 | * freed by the caller. |
8df7a775 |
2787 | */ |
cbe2d68f |
2788 | static const char *connect_to_host(Ssh ssh, char *host, int port, |
79bf227b |
2789 | char **realhost, int nodelay, int keepalive) |
8df7a775 |
2790 | { |
51470298 |
2791 | static const struct plug_function_table fn_table = { |
7555d6a5 |
2792 | ssh_log, |
7e78000d |
2793 | ssh_closing, |
5471d09a |
2794 | ssh_receive, |
2795 | ssh_sent, |
2796 | NULL |
51470298 |
2797 | }; |
7e78000d |
2798 | |
8df7a775 |
2799 | SockAddr addr; |
cbe2d68f |
2800 | const char *err; |
8df7a775 |
2801 | |
3d88e64d |
2802 | ssh->savedhost = snewn(1 + strlen(host), char); |
51470298 |
2803 | strcpy(ssh->savedhost, host); |
8df7a775 |
2804 | |
2805 | if (port < 0) |
2806 | port = 22; /* default ssh port */ |
51470298 |
2807 | ssh->savedport = port; |
8df7a775 |
2808 | |
2809 | /* |
2810 | * Try to find host. |
2811 | */ |
05581745 |
2812 | logeventf(ssh, "Looking up host \"%s\"%s", host, |
2813 | (ssh->cfg.addressfamily == ADDRTYPE_IPV4 ? " (IPv4)" : |
2814 | (ssh->cfg.addressfamily == ADDRTYPE_IPV6 ? " (IPv6)" : ""))); |
2815 | addr = name_lookup(host, port, realhost, &ssh->cfg, |
2816 | ssh->cfg.addressfamily); |
170c1e6e |
2817 | if ((err = sk_addr_error(addr)) != NULL) { |
2818 | sk_addr_free(addr); |
8df7a775 |
2819 | return err; |
170c1e6e |
2820 | } |
8df7a775 |
2821 | |
8df7a775 |
2822 | /* |
2823 | * Open socket. |
2824 | */ |
51470298 |
2825 | ssh->fn = &fn_table; |
e8fa8f62 |
2826 | ssh->s = new_connection(addr, *realhost, port, |
79bf227b |
2827 | 0, 1, nodelay, keepalive, (Plug) ssh, &ssh->cfg); |
70e5d0fd |
2828 | if ((err = sk_socket_error(ssh->s)) != NULL) { |
51470298 |
2829 | ssh->s = NULL; |
39934deb |
2830 | notify_remote_exit(ssh->frontend); |
8df7a775 |
2831 | return err; |
67c4ba2e |
2832 | } |
8df7a775 |
2833 | |
8df7a775 |
2834 | return NULL; |
2835 | } |
2836 | |
2837 | /* |
5471d09a |
2838 | * Throttle or unthrottle the SSH connection. |
2839 | */ |
51470298 |
2840 | static void ssh1_throttle(Ssh ssh, int adjust) |
5471d09a |
2841 | { |
51470298 |
2842 | int old_count = ssh->v1_throttle_count; |
2843 | ssh->v1_throttle_count += adjust; |
2844 | assert(ssh->v1_throttle_count >= 0); |
2845 | if (ssh->v1_throttle_count && !old_count) { |
3d9449a1 |
2846 | ssh_set_frozen(ssh, 1); |
51470298 |
2847 | } else if (!ssh->v1_throttle_count && old_count) { |
3d9449a1 |
2848 | ssh_set_frozen(ssh, 0); |
5471d09a |
2849 | } |
2850 | } |
2851 | |
2852 | /* |
2853 | * Throttle or unthrottle _all_ local data streams (for when sends |
2854 | * on the SSH connection itself back up). |
2855 | */ |
51470298 |
2856 | static void ssh_throttle_all(Ssh ssh, int enable, int bufsize) |
5471d09a |
2857 | { |
2858 | int i; |
2859 | struct ssh_channel *c; |
2860 | |
51470298 |
2861 | if (enable == ssh->throttled_all) |
5471d09a |
2862 | return; |
51470298 |
2863 | ssh->throttled_all = enable; |
2864 | ssh->overall_bufsize = bufsize; |
2865 | if (!ssh->channels) |
5471d09a |
2866 | return; |
51470298 |
2867 | for (i = 0; NULL != (c = index234(ssh->channels, i)); i++) { |
5471d09a |
2868 | switch (c->type) { |
2869 | case CHAN_MAINSESSION: |
2870 | /* |
2871 | * This is treated separately, outside the switch. |
2872 | */ |
2873 | break; |
2874 | case CHAN_X11: |
2875 | x11_override_throttle(c->u.x11.s, enable); |
2876 | break; |
2877 | case CHAN_AGENT: |
2878 | /* Agent channels require no buffer management. */ |
2879 | break; |
2880 | case CHAN_SOCKDATA: |
36f94d1f |
2881 | pfd_override_throttle(c->u.pfd.s, enable); |
5471d09a |
2882 | break; |
2883 | } |
2884 | } |
2885 | } |
2886 | |
f11d78f2 |
2887 | static void ssh_agent_callback(void *sshv, void *reply, int replylen) |
839f10db |
2888 | { |
2889 | Ssh ssh = (Ssh) sshv; |
2890 | |
2891 | ssh->agent_response = reply; |
2892 | ssh->agent_response_len = replylen; |
2893 | |
2894 | if (ssh->version == 1) |
ff3187f6 |
2895 | do_ssh1_login(ssh, NULL, -1, NULL); |
839f10db |
2896 | else |
ff3187f6 |
2897 | do_ssh2_authconn(ssh, NULL, -1, NULL); |
839f10db |
2898 | } |
2899 | |
3d9449a1 |
2900 | static void ssh_dialog_callback(void *sshv, int ret) |
2901 | { |
2902 | Ssh ssh = (Ssh) sshv; |
2903 | |
2904 | ssh->user_response = ret; |
2905 | |
2906 | if (ssh->version == 1) |
2907 | do_ssh1_login(ssh, NULL, -1, NULL); |
2908 | else |
2909 | do_ssh2_transport(ssh, NULL, -1, NULL); |
2910 | |
2911 | /* |
2912 | * This may have unfrozen the SSH connection, so do a |
2913 | * queued-data run. |
2914 | */ |
2915 | ssh_process_queued_incoming_data(ssh); |
2916 | } |
2917 | |
f11d78f2 |
2918 | static void ssh_agentf_callback(void *cv, void *reply, int replylen) |
839f10db |
2919 | { |
2920 | struct ssh_channel *c = (struct ssh_channel *)cv; |
2921 | Ssh ssh = c->ssh; |
2922 | void *sentreply = reply; |
2923 | |
2924 | if (!sentreply) { |
2925 | /* Fake SSH_AGENT_FAILURE. */ |
2926 | sentreply = "\0\0\0\1\5"; |
2927 | replylen = 5; |
2928 | } |
2929 | if (ssh->version == 2) { |
2930 | ssh2_add_channel_data(c, sentreply, replylen); |
2931 | ssh2_try_send(c); |
2932 | } else { |
2933 | send_packet(ssh, SSH1_MSG_CHANNEL_DATA, |
2934 | PKT_INT, c->remoteid, |
9a10ecf4 |
2935 | PKTT_DATA, |
839f10db |
2936 | PKT_INT, replylen, |
2937 | PKT_DATA, sentreply, replylen, |
9a10ecf4 |
2938 | PKTT_OTHER, |
839f10db |
2939 | PKT_END); |
2940 | } |
2941 | if (reply) |
2942 | sfree(reply); |
2943 | } |
2944 | |
0405e71f |
2945 | /* |
9e296bfa |
2946 | * Client-initiated disconnection. Send a DISCONNECT if `wire_reason' |
2947 | * non-NULL, otherwise just close the connection. `client_reason' == NULL |
2948 | * => log `wire_reason'. |
2949 | */ |
2950 | static void ssh_disconnect(Ssh ssh, char *client_reason, char *wire_reason, |
2951 | int code, int clean_exit) |
2952 | { |
2953 | char *error; |
2954 | if (!client_reason) |
2955 | client_reason = wire_reason; |
2956 | if (client_reason) |
2957 | error = dupprintf("Disconnected: %s", client_reason); |
2958 | else |
2959 | error = dupstr("Disconnected"); |
2960 | if (wire_reason) { |
2961 | if (ssh->version == 1) { |
2962 | send_packet(ssh, SSH1_MSG_DISCONNECT, PKT_STR, wire_reason, |
2963 | PKT_END); |
2964 | } else if (ssh->version == 2) { |
2965 | struct Packet *pktout = ssh2_pkt_init(SSH2_MSG_DISCONNECT); |
2966 | ssh2_pkt_adduint32(pktout, code); |
2967 | ssh2_pkt_addstring(pktout, wire_reason); |
2968 | ssh2_pkt_addstring(pktout, "en"); /* language tag */ |
2969 | ssh2_pkt_send_noqueue(ssh, pktout); |
2970 | } |
2971 | } |
2972 | ssh->close_expected = TRUE; |
2973 | ssh->clean_exit = clean_exit; |
2974 | ssh_closing((Plug)ssh, error, 0, 0); |
2975 | sfree(error); |
2976 | } |
2977 | |
2978 | /* |
fb09bf1c |
2979 | * Handle the key exchange and user authentication phases. |
2980 | */ |
ff3187f6 |
2981 | static int do_ssh1_login(Ssh ssh, unsigned char *in, int inlen, |
2982 | struct Packet *pktin) |
fb09bf1c |
2983 | { |
0016d70b |
2984 | int i, j, ret; |
2985 | unsigned char cookie[8], *ptr; |
374330e2 |
2986 | struct RSAKey servkey, hostkey; |
2987 | struct MD5Context md5c; |
51470298 |
2988 | struct do_ssh1_login_state { |
2989 | int len; |
2990 | unsigned char *rsabuf, *keystr1, *keystr2; |
2991 | unsigned long supported_ciphers_mask, supported_auths_mask; |
2992 | int tried_publickey, tried_agent; |
2993 | int tis_auth_refused, ccard_auth_refused; |
2994 | unsigned char session_id[16]; |
2995 | int cipher_type; |
2996 | char username[100]; |
2997 | void *publickey_blob; |
2998 | int publickey_bloblen; |
edd0cb8a |
2999 | char *publickey_comment; |
3000 | int publickey_encrypted; |
3001 | prompts_t *cur_prompt; |
51470298 |
3002 | char c; |
3003 | int pwpkt_type; |
3004 | unsigned char request[5], *response, *p; |
3005 | int responselen; |
3006 | int keyi, nkeys; |
3007 | int authed; |
3008 | struct RSAKey key; |
3009 | Bignum challenge; |
3010 | char *commentp; |
3011 | int commentlen; |
3d9449a1 |
3012 | int dlgret; |
51470298 |
3013 | }; |
3014 | crState(do_ssh1_login_state); |
3015 | |
3016 | crBegin(ssh->do_ssh1_login_crstate); |
374330e2 |
3017 | |
ff3187f6 |
3018 | if (!pktin) |
3019 | crWaitUntil(pktin); |
374330e2 |
3020 | |
ff3187f6 |
3021 | if (pktin->type != SSH1_SMSG_PUBLIC_KEY) { |
6b5cf8b4 |
3022 | bombout(("Public key packet not received")); |
7ffdbc1a |
3023 | crStop(0); |
8d5de777 |
3024 | } |
374330e2 |
3025 | |
c5e9c988 |
3026 | logevent("Received public keys"); |
374330e2 |
3027 | |
ff3187f6 |
3028 | ptr = ssh_pkt_getdata(pktin, 8); |
0016d70b |
3029 | if (!ptr) { |
2e85c969 |
3030 | bombout(("SSH-1 public key packet stopped before random cookie")); |
0016d70b |
3031 | crStop(0); |
3032 | } |
3033 | memcpy(cookie, ptr, 8); |
374330e2 |
3034 | |
ff3187f6 |
3035 | if (!ssh1_pkt_getrsakey(pktin, &servkey, &s->keystr1) || |
3036 | !ssh1_pkt_getrsakey(pktin, &hostkey, &s->keystr2)) { |
2e85c969 |
3037 | bombout(("Failed to read SSH-1 public keys from public key packet")); |
0016d70b |
3038 | crStop(0); |
3039 | } |
374330e2 |
3040 | |
c5e9c988 |
3041 | /* |
1c2a93c4 |
3042 | * Log the host key fingerprint. |
c5e9c988 |
3043 | */ |
c5e9c988 |
3044 | { |
3045 | char logmsg[80]; |
1c2a93c4 |
3046 | logevent("Host key fingerprint is:"); |
c5e9c988 |
3047 | strcpy(logmsg, " "); |
32874aea |
3048 | hostkey.comment = NULL; |
3049 | rsa_fingerprint(logmsg + strlen(logmsg), |
3050 | sizeof(logmsg) - strlen(logmsg), &hostkey); |
c5e9c988 |
3051 | logevent(logmsg); |
3052 | } |
3053 | |
ff3187f6 |
3054 | ssh->v1_remote_protoflags = ssh_pkt_getuint32(pktin); |
3055 | s->supported_ciphers_mask = ssh_pkt_getuint32(pktin); |
3056 | s->supported_auths_mask = ssh_pkt_getuint32(pktin); |
bea1ef5f |
3057 | |
51470298 |
3058 | ssh->v1_local_protoflags = |
3059 | ssh->v1_remote_protoflags & SSH1_PROTOFLAGS_SUPPORTED; |
3060 | ssh->v1_local_protoflags |= SSH1_PROTOFLAG_SCREEN_NUMBER; |
b96dc54c |
3061 | |
c5e9c988 |
3062 | MD5Init(&md5c); |
51470298 |
3063 | MD5Update(&md5c, s->keystr2, hostkey.bytes); |
3064 | MD5Update(&md5c, s->keystr1, servkey.bytes); |
0016d70b |
3065 | MD5Update(&md5c, cookie, 8); |
51470298 |
3066 | MD5Final(s->session_id, &md5c); |
374330e2 |
3067 | |
32874aea |
3068 | for (i = 0; i < 32; i++) |
51470298 |
3069 | ssh->session_key[i] = random_byte(); |
374330e2 |
3070 | |
0016d70b |
3071 | /* |
3072 | * Verify that the `bits' and `bytes' parameters match. |
3073 | */ |
3074 | if (hostkey.bits > hostkey.bytes * 8 || |
3075 | servkey.bits > servkey.bytes * 8) { |
2e85c969 |
3076 | bombout(("SSH-1 public keys were badly formatted")); |
0016d70b |
3077 | crStop(0); |
3078 | } |
3079 | |
51470298 |
3080 | s->len = (hostkey.bytes > servkey.bytes ? hostkey.bytes : servkey.bytes); |
374330e2 |
3081 | |
3d88e64d |
3082 | s->rsabuf = snewn(s->len, unsigned char); |
374330e2 |
3083 | |
89ee5268 |
3084 | /* |
3085 | * Verify the host key. |
3086 | */ |
3087 | { |
32874aea |
3088 | /* |
3089 | * First format the key into a string. |
3090 | */ |
3091 | int len = rsastr_len(&hostkey); |
3092 | char fingerprint[100]; |
3d88e64d |
3093 | char *keystr = snewn(len, char); |
32874aea |
3094 | rsastr_fmt(keystr, &hostkey); |
3095 | rsa_fingerprint(fingerprint, sizeof(fingerprint), &hostkey); |
3d9449a1 |
3096 | |
3097 | ssh_set_frozen(ssh, 1); |
3098 | s->dlgret = verify_ssh_host_key(ssh->frontend, |
3099 | ssh->savedhost, ssh->savedport, |
3100 | "rsa", keystr, fingerprint, |
3101 | ssh_dialog_callback, ssh); |
32874aea |
3102 | sfree(keystr); |
3d9449a1 |
3103 | if (s->dlgret < 0) { |
3104 | do { |
3105 | crReturn(0); |
3106 | if (pktin) { |
3107 | bombout(("Unexpected data from server while waiting" |
3108 | " for user host key response")); |
3109 | crStop(0); |
3110 | } |
3111 | } while (pktin || inlen > 0); |
3112 | s->dlgret = ssh->user_response; |
3113 | } |
3114 | ssh_set_frozen(ssh, 0); |
3115 | |
3116 | if (s->dlgret == 0) { |
9e296bfa |
3117 | ssh_disconnect(ssh, "User aborted at host key verification", |
3118 | NULL, 0, TRUE); |
2b3f6c19 |
3119 | crStop(0); |
3d9449a1 |
3120 | } |
32874aea |
3121 | } |
3122 | |
3123 | for (i = 0; i < 32; i++) { |
51470298 |
3124 | s->rsabuf[i] = ssh->session_key[i]; |
374330e2 |
3125 | if (i < 16) |
51470298 |
3126 | s->rsabuf[i] ^= s->session_id[i]; |
374330e2 |
3127 | } |
3128 | |
3129 | if (hostkey.bytes > servkey.bytes) { |
0016d70b |
3130 | ret = rsaencrypt(s->rsabuf, 32, &servkey); |
3131 | if (ret) |
3132 | ret = rsaencrypt(s->rsabuf, servkey.bytes, &hostkey); |
374330e2 |
3133 | } else { |
0016d70b |
3134 | ret = rsaencrypt(s->rsabuf, 32, &hostkey); |
3135 | if (ret) |
3136 | ret = rsaencrypt(s->rsabuf, hostkey.bytes, &servkey); |
3137 | } |
3138 | if (!ret) { |
2e85c969 |
3139 | bombout(("SSH-1 public key encryptions failed due to bad formatting")); |
0016d70b |
3140 | crStop(0); |
374330e2 |
3141 | } |
3142 | |
c5e9c988 |
3143 | logevent("Encrypted session key"); |
3144 | |
ca20bfcf |
3145 | { |
3146 | int cipher_chosen = 0, warn = 0; |
3147 | char *cipher_string = NULL; |
51470298 |
3148 | int i; |
ca20bfcf |
3149 | for (i = 0; !cipher_chosen && i < CIPHER_MAX; i++) { |
86916870 |
3150 | int next_cipher = ssh->cfg.ssh_cipherlist[i]; |
ca20bfcf |
3151 | if (next_cipher == CIPHER_WARN) { |
3152 | /* If/when we choose a cipher, warn about it */ |
3153 | warn = 1; |
3154 | } else if (next_cipher == CIPHER_AES) { |
3155 | /* XXX Probably don't need to mention this. */ |
2e85c969 |
3156 | logevent("AES not supported in SSH-1, skipping"); |
ca20bfcf |
3157 | } else { |
3158 | switch (next_cipher) { |
51470298 |
3159 | case CIPHER_3DES: s->cipher_type = SSH_CIPHER_3DES; |
ca20bfcf |
3160 | cipher_string = "3DES"; break; |
51470298 |
3161 | case CIPHER_BLOWFISH: s->cipher_type = SSH_CIPHER_BLOWFISH; |
ca20bfcf |
3162 | cipher_string = "Blowfish"; break; |
51470298 |
3163 | case CIPHER_DES: s->cipher_type = SSH_CIPHER_DES; |
ca20bfcf |
3164 | cipher_string = "single-DES"; break; |
3165 | } |
51470298 |
3166 | if (s->supported_ciphers_mask & (1 << s->cipher_type)) |
ca20bfcf |
3167 | cipher_chosen = 1; |
3168 | } |
3169 | } |
3170 | if (!cipher_chosen) { |
51470298 |
3171 | if ((s->supported_ciphers_mask & (1 << SSH_CIPHER_3DES)) == 0) |
2e85c969 |
3172 | bombout(("Server violates SSH-1 protocol by not " |
ca20bfcf |
3173 | "supporting 3DES encryption")); |
3174 | else |
3175 | /* shouldn't happen */ |
6b5cf8b4 |
3176 | bombout(("No supported ciphers found")); |
7ffdbc1a |
3177 | crStop(0); |
a99a05c0 |
3178 | } |
ca20bfcf |
3179 | |
3180 | /* Warn about chosen cipher if necessary. */ |
bb348ab1 |
3181 | if (warn) { |
3d9449a1 |
3182 | ssh_set_frozen(ssh, 1); |
3183 | s->dlgret = askalg(ssh->frontend, "cipher", cipher_string, |
3184 | ssh_dialog_callback, ssh); |
3185 | if (s->dlgret < 0) { |
3186 | do { |
3187 | crReturn(0); |
3188 | if (pktin) { |
3189 | bombout(("Unexpected data from server while waiting" |
3190 | " for user response")); |
3191 | crStop(0); |
3192 | } |
3193 | } while (pktin || inlen > 0); |
3194 | s->dlgret = ssh->user_response; |
3195 | } |
3196 | ssh_set_frozen(ssh, 0); |
3197 | if (s->dlgret == 0) { |
9e296bfa |
3198 | ssh_disconnect(ssh, "User aborted at cipher warning", NULL, |
3199 | 0, TRUE); |
96ccde8b |
3200 | crStop(0); |
3d9449a1 |
3201 | } |
bb348ab1 |
3202 | } |
bea1ef5f |
3203 | } |
ca20bfcf |
3204 | |
51470298 |
3205 | switch (s->cipher_type) { |
32874aea |
3206 | case SSH_CIPHER_3DES: |
3207 | logevent("Using 3DES encryption"); |
3208 | break; |
3209 | case SSH_CIPHER_DES: |
3210 | logevent("Using single-DES encryption"); |
3211 | break; |
3212 | case SSH_CIPHER_BLOWFISH: |
3213 | logevent("Using Blowfish encryption"); |
3214 | break; |
c5e9c988 |
3215 | } |
bea1ef5f |
3216 | |
51470298 |
3217 | send_packet(ssh, SSH1_CMSG_SESSION_KEY, |
3218 | PKT_CHAR, s->cipher_type, |
32874aea |
3219 | PKT_DATA, cookie, 8, |
51470298 |
3220 | PKT_CHAR, (s->len * 8) >> 8, PKT_CHAR, (s->len * 8) & 0xFF, |
3221 | PKT_DATA, s->rsabuf, s->len, |
3222 | PKT_INT, ssh->v1_local_protoflags, PKT_END); |
fb09bf1c |
3223 | |
c5e9c988 |
3224 | logevent("Trying to enable encryption..."); |
374330e2 |
3225 | |
51470298 |
3226 | sfree(s->rsabuf); |
374330e2 |
3227 | |
51470298 |
3228 | ssh->cipher = (s->cipher_type == SSH_CIPHER_BLOWFISH ? &ssh_blowfish_ssh1 : |
3229 | s->cipher_type == SSH_CIPHER_DES ? &ssh_des : |
3230 | &ssh_3des); |
371e569c |
3231 | ssh->v1_cipher_ctx = ssh->cipher->make_context(); |
3232 | ssh->cipher->sesskey(ssh->v1_cipher_ctx, ssh->session_key); |
57356d63 |
3233 | logeventf(ssh, "Initialised %s encryption", ssh->cipher->text_name); |
374330e2 |
3234 | |
0183b242 |
3235 | ssh->crcda_ctx = crcda_make_context(); |
3236 | logevent("Installing CRC compensation attack detector"); |
3237 | |
679539d7 |
3238 | if (servkey.modulus) { |
3239 | sfree(servkey.modulus); |
3240 | servkey.modulus = NULL; |
3241 | } |
3242 | if (servkey.exponent) { |
3243 | sfree(servkey.exponent); |
3244 | servkey.exponent = NULL; |
3245 | } |
3246 | if (hostkey.modulus) { |
3247 | sfree(hostkey.modulus); |
3248 | hostkey.modulus = NULL; |
3249 | } |
3250 | if (hostkey.exponent) { |
3251 | sfree(hostkey.exponent); |
3252 | hostkey.exponent = NULL; |
3253 | } |
ff3187f6 |
3254 | crWaitUntil(pktin); |
374330e2 |
3255 | |
ff3187f6 |
3256 | if (pktin->type != SSH1_SMSG_SUCCESS) { |
6b5cf8b4 |
3257 | bombout(("Encryption not successfully enabled")); |
7ffdbc1a |
3258 | crStop(0); |
8d5de777 |
3259 | } |
374330e2 |
3260 | |
c5e9c988 |
3261 | logevent("Successfully started encryption"); |
3262 | |
edd0cb8a |
3263 | fflush(stdout); /* FIXME eh? */ |
374330e2 |
3264 | { |
aa09f7d0 |
3265 | if (!*ssh->cfg.username) { |
edd0cb8a |
3266 | int ret; /* need not be kept over crReturn */ |
3267 | s->cur_prompt = new_prompts(ssh->frontend); |
3268 | s->cur_prompt->to_server = TRUE; |
3269 | s->cur_prompt->name = dupstr("SSH login name"); |
3270 | add_prompt(s->cur_prompt, dupstr("login as: "), TRUE, |
3271 | lenof(s->username)); |
3272 | ret = get_userpass_input(s->cur_prompt, NULL, 0); |
3273 | while (ret < 0) { |
51470298 |
3274 | ssh->send_ok = 1; |
edd0cb8a |
3275 | crWaitUntil(!pktin); |
3276 | ret = get_userpass_input(s->cur_prompt, in, inlen); |
3277 | ssh->send_ok = 0; |
3278 | } |
3279 | if (!ret) { |
3280 | /* |
3281 | * Failed to get a username. Terminate. |
3282 | */ |
3283 | free_prompts(s->cur_prompt); |
3284 | ssh_disconnect(ssh, "No username provided", NULL, 0, TRUE); |
3285 | crStop(0); |
32874aea |
3286 | } |
edd0cb8a |
3287 | memcpy(s->username, s->cur_prompt->prompts[0]->result, |
3288 | lenof(s->username)); |
3289 | free_prompts(s->cur_prompt); |
32874aea |
3290 | } else { |
86916870 |
3291 | strncpy(s->username, ssh->cfg.username, sizeof(s->username)); |
51470298 |
3292 | s->username[sizeof(s->username)-1] = '\0'; |
374330e2 |
3293 | } |
fb09bf1c |
3294 | |
51470298 |
3295 | send_packet(ssh, SSH1_CMSG_USER, PKT_STR, s->username, PKT_END); |
c5e9c988 |
3296 | { |
edd0cb8a |
3297 | char *userlog = dupprintf("Sent username \"%s\"", s->username); |
c5e9c988 |
3298 | logevent(userlog); |
32874aea |
3299 | if (flags & FLAG_INTERACTIVE && |
3300 | (!((flags & FLAG_STDERR) && (flags & FLAG_VERBOSE)))) { |
51470298 |
3301 | c_write_str(ssh, userlog); |
edd0cb8a |
3302 | c_write_str(ssh, "\r\n"); |
3c8e959b |
3303 | } |
edd0cb8a |
3304 | sfree(userlog); |
c5e9c988 |
3305 | } |
374330e2 |
3306 | } |
3307 | |
ff3187f6 |
3308 | crWaitUntil(pktin); |
374330e2 |
3309 | |
51470298 |
3310 | if ((ssh->remote_bugs & BUG_CHOKES_ON_RSA)) { |
0df73905 |
3311 | /* We must not attempt PK auth. Pretend we've already tried it. */ |
51470298 |
3312 | s->tried_publickey = s->tried_agent = 1; |
0df73905 |
3313 | } else { |
51470298 |
3314 | s->tried_publickey = s->tried_agent = 0; |
0df73905 |
3315 | } |
51470298 |
3316 | s->tis_auth_refused = s->ccard_auth_refused = 0; |
edd0cb8a |
3317 | /* |
3318 | * Load the public half of any configured keyfile for later use. |
3319 | */ |
9a30e26b |
3320 | if (!filename_is_null(ssh->cfg.keyfile)) { |
edd0cb8a |
3321 | int keytype; |
3322 | logeventf(ssh, "Reading private key file \"%.150s\"", |
3323 | filename_to_str(&ssh->cfg.keyfile)); |
3324 | keytype = key_type(&ssh->cfg.keyfile); |
3325 | if (keytype == SSH_KEYTYPE_SSH1) { |
3326 | const char *error; |
3327 | if (rsakey_pubblob(&ssh->cfg.keyfile, |
3328 | &s->publickey_blob, &s->publickey_bloblen, |
3329 | &s->publickey_comment, &error)) { |
3330 | s->publickey_encrypted = rsakey_encrypted(&ssh->cfg.keyfile, |
3331 | NULL); |
3332 | } else { |
3333 | char *msgbuf; |
3334 | logeventf(ssh, "Unable to load private key (%s)", error); |
3335 | msgbuf = dupprintf("Unable to load private key file " |
3336 | "\"%.150s\" (%s)\r\n", |
3337 | filename_to_str(&ssh->cfg.keyfile), |
3338 | error); |
3339 | c_write_str(ssh, msgbuf); |
3340 | sfree(msgbuf); |
3341 | s->publickey_blob = NULL; |
3342 | } |
3343 | } else { |
3344 | char *msgbuf; |
3345 | logeventf(ssh, "Unable to use this key file (%s)", |
3346 | key_type_to_str(keytype)); |
3347 | msgbuf = dupprintf("Unable to use key file \"%.150s\"" |
3348 | " (%s)\r\n", |
3349 | filename_to_str(&ssh->cfg.keyfile), |
3350 | key_type_to_str(keytype)); |
3351 | c_write_str(ssh, msgbuf); |
3352 | sfree(msgbuf); |
51470298 |
3353 | s->publickey_blob = NULL; |
edd0cb8a |
3354 | } |
396778f1 |
3355 | } else |
51470298 |
3356 | s->publickey_blob = NULL; |
7cca0d81 |
3357 | |
ff3187f6 |
3358 | while (pktin->type == SSH1_SMSG_FAILURE) { |
51470298 |
3359 | s->pwpkt_type = SSH1_CMSG_AUTH_PASSWORD; |
614a20a0 |
3360 | |
973612f5 |
3361 | if (ssh->cfg.tryagent && agent_exists() && !s->tried_agent) { |
32874aea |
3362 | /* |
3363 | * Attempt RSA authentication using Pageant. |
3364 | */ |
32874aea |
3365 | void *r; |
3366 | |
51470298 |
3367 | s->authed = FALSE; |
3368 | s->tried_agent = 1; |
32874aea |
3369 | logevent("Pageant is running. Requesting keys."); |
3370 | |
3371 | /* Request the keys held by the agent. */ |
51470298 |
3372 | PUT_32BIT(s->request, 1); |
3373 | s->request[4] = SSH1_AGENTC_REQUEST_RSA_IDENTITIES; |
839f10db |
3374 | if (!agent_query(s->request, 5, &r, &s->responselen, |
3375 | ssh_agent_callback, ssh)) { |
3376 | do { |
3377 | crReturn(0); |
ff3187f6 |
3378 | if (pktin) { |
839f10db |
3379 | bombout(("Unexpected data from server while waiting" |
3380 | " for agent response")); |
3381 | crStop(0); |
3382 | } |
ff3187f6 |
3383 | } while (pktin || inlen > 0); |
839f10db |
3384 | r = ssh->agent_response; |
3385 | s->responselen = ssh->agent_response_len; |
3386 | } |
51470298 |
3387 | s->response = (unsigned char *) r; |
3388 | if (s->response && s->responselen >= 5 && |
3389 | s->response[4] == SSH1_AGENT_RSA_IDENTITIES_ANSWER) { |
3390 | s->p = s->response + 5; |
3391 | s->nkeys = GET_32BIT(s->p); |
3392 | s->p += 4; |
2e85c969 |
3393 | logeventf(ssh, "Pageant has %d SSH-1 keys", s->nkeys); |
51470298 |
3394 | for (s->keyi = 0; s->keyi < s->nkeys; s->keyi++) { |
94cd7c3a |
3395 | unsigned char *pkblob = s->p; |
51470298 |
3396 | s->p += 4; |
0016d70b |
3397 | { |
3398 | int n, ok = FALSE; |
3399 | do { /* do while (0) to make breaking easy */ |
3400 | n = ssh1_read_bignum |
3401 | (s->p, s->responselen-(s->p-s->response), |
3402 | &s->key.exponent); |
3403 | if (n < 0) |
3404 | break; |
3405 | s->p += n; |
3406 | n = ssh1_read_bignum |
3407 | (s->p, s->responselen-(s->p-s->response), |
3408 | &s->key.modulus); |
3409 | if (n < 0) |
3410 | break; |
3411 | s->p += n; |
3412 | if (s->responselen - (s->p-s->response) < 4) |
3413 | break; |
3414 | s->commentlen = GET_32BIT(s->p); |
3415 | s->p += 4; |
3416 | if (s->responselen - (s->p-s->response) < |
3417 | s->commentlen) |
3418 | break; |
3419 | s->commentp = (char *)s->p; |
3420 | s->p += s->commentlen; |
3421 | ok = TRUE; |
3422 | } while (0); |
3423 | if (!ok) { |
3424 | logevent("Pageant key list packet was truncated"); |
3425 | break; |
3426 | } |
3427 | } |
94cd7c3a |
3428 | if (s->publickey_blob) { |
3429 | if (!memcmp(pkblob, s->publickey_blob, |
3430 | s->publickey_bloblen)) { |
3431 | logeventf(ssh, "Pageant key #%d matches " |
3432 | "configured key file", s->keyi); |
3433 | s->tried_publickey = 1; |
3434 | } else |
3435 | /* Skip non-configured key */ |
3436 | continue; |
3437 | } |
3438 | logeventf(ssh, "Trying Pageant key #%d", s->keyi); |
51470298 |
3439 | send_packet(ssh, SSH1_CMSG_AUTH_RSA, |
3440 | PKT_BIGNUM, s->key.modulus, PKT_END); |
ff3187f6 |
3441 | crWaitUntil(pktin); |
3442 | if (pktin->type != SSH1_SMSG_AUTH_RSA_CHALLENGE) { |
32874aea |
3443 | logevent("Key refused"); |
3444 | continue; |
3445 | } |
3446 | logevent("Received RSA challenge"); |
ff3187f6 |
3447 | if ((s->challenge = ssh1_pkt_getmp(pktin)) == NULL) { |
0016d70b |
3448 | bombout(("Server's RSA challenge was badly formatted")); |
3449 | crStop(0); |
3450 | } |
3451 | |
32874aea |
3452 | { |
3453 | char *agentreq, *q, *ret; |
2d466ffd |
3454 | void *vret; |
32874aea |
3455 | int len, retlen; |
3456 | len = 1 + 4; /* message type, bit count */ |
51470298 |
3457 | len += ssh1_bignum_length(s->key.exponent); |
3458 | len += ssh1_bignum_length(s->key.modulus); |
3459 | len += ssh1_bignum_length(s->challenge); |
32874aea |
3460 | len += 16; /* session id */ |
3461 | len += 4; /* response format */ |
3d88e64d |
3462 | agentreq = snewn(4 + len, char); |
32874aea |
3463 | PUT_32BIT(agentreq, len); |
3464 | q = agentreq + 4; |
3465 | *q++ = SSH1_AGENTC_RSA_CHALLENGE; |
51470298 |
3466 | PUT_32BIT(q, bignum_bitcount(s->key.modulus)); |
32874aea |
3467 | q += 4; |
51470298 |
3468 | q += ssh1_write_bignum(q, s->key.exponent); |
3469 | q += ssh1_write_bignum(q, s->key.modulus); |
3470 | q += ssh1_write_bignum(q, s->challenge); |
3471 | memcpy(q, s->session_id, 16); |
32874aea |
3472 | q += 16; |
3473 | PUT_32BIT(q, 1); /* response format */ |
839f10db |
3474 | if (!agent_query(agentreq, len + 4, &vret, &retlen, |
3475 | ssh_agent_callback, ssh)) { |
3476 | sfree(agentreq); |
3477 | do { |
3478 | crReturn(0); |
ff3187f6 |
3479 | if (pktin) { |
839f10db |
3480 | bombout(("Unexpected data from server" |
3481 | " while waiting for agent" |
3482 | " response")); |
3483 | crStop(0); |
3484 | } |
ff3187f6 |
3485 | } while (pktin || inlen > 0); |
839f10db |
3486 | vret = ssh->agent_response; |
3487 | retlen = ssh->agent_response_len; |
3488 | } else |
3489 | sfree(agentreq); |
2d466ffd |
3490 | ret = vret; |
32874aea |
3491 | if (ret) { |
3492 | if (ret[4] == SSH1_AGENT_RSA_RESPONSE) { |
3493 | logevent("Sending Pageant's response"); |
51470298 |
3494 | send_packet(ssh, SSH1_CMSG_AUTH_RSA_RESPONSE, |
32874aea |
3495 | PKT_DATA, ret + 5, 16, |
3496 | PKT_END); |
3497 | sfree(ret); |
ff3187f6 |
3498 | crWaitUntil(pktin); |
3499 | if (pktin->type == SSH1_SMSG_SUCCESS) { |
32874aea |
3500 | logevent |
3501 | ("Pageant's response accepted"); |
3502 | if (flags & FLAG_VERBOSE) { |
51470298 |
3503 | c_write_str(ssh, "Authenticated using" |
3504 | " RSA key \""); |
3505 | c_write(ssh, s->commentp, |
3506 | s->commentlen); |
3507 | c_write_str(ssh, "\" from agent\r\n"); |
32874aea |
3508 | } |
51470298 |
3509 | s->authed = TRUE; |
32874aea |
3510 | } else |
3511 | logevent |
3512 | ("Pageant's response not accepted"); |
3513 | } else { |
3514 | logevent |
3515 | ("Pageant failed to answer challenge"); |
3516 | sfree(ret); |
3517 | } |
3518 | } else { |
3519 | logevent("No reply received from Pageant"); |
3520 | } |
3521 | } |
51470298 |
3522 | freebn(s->key.exponent); |
3523 | freebn(s->key.modulus); |
3524 | freebn(s->challenge); |
3525 | if (s->authed) |
32874aea |
3526 | break; |
3527 | } |
29b1d0b3 |
3528 | sfree(s->response); |
94cd7c3a |
3529 | if (s->publickey_blob && !s->tried_publickey) |
3530 | logevent("Configured key file not in Pageant"); |
32874aea |
3531 | } |
51470298 |
3532 | if (s->authed) |
32874aea |
3533 | break; |
3534 | } |
edd0cb8a |
3535 | if (s->publickey_blob && !s->tried_publickey) { |
3536 | /* |
3537 | * Try public key authentication with the specified |
3538 | * key file. |
3539 | */ |
3540 | int got_passphrase; /* need not be kept over crReturn */ |
3541 | if (flags & FLAG_VERBOSE) |
3542 | c_write_str(ssh, "Trying public key authentication.\r\n"); |
3543 | logeventf(ssh, "Trying public key \"%s\"", |
3544 | filename_to_str(&ssh->cfg.keyfile)); |
3545 | s->tried_publickey = 1; |
3546 | got_passphrase = FALSE; |
3547 | while (!got_passphrase) { |
3548 | /* |
3549 | * Get a passphrase, if necessary. |
3550 | */ |
3551 | char *passphrase = NULL; /* only written after crReturn */ |
3552 | const char *error; |
3553 | if (!s->publickey_encrypted) { |
3554 | if (flags & FLAG_VERBOSE) |
3555 | c_write_str(ssh, "No passphrase required.\r\n"); |
3556 | passphrase = NULL; |
3557 | } else { |
3558 | int ret; /* need not be kept over crReturn */ |
3559 | s->cur_prompt = new_prompts(ssh->frontend); |
3560 | s->cur_prompt->to_server = FALSE; |
3561 | s->cur_prompt->name = dupstr("SSH key passphrase"); |
3562 | add_prompt(s->cur_prompt, |
3563 | dupprintf("Passphrase for key \"%.100s\": ", |
3564 | s->publickey_comment), |
3565 | FALSE, SSH_MAX_PASSWORD_LEN); |
3566 | ret = get_userpass_input(s->cur_prompt, NULL, 0); |
3567 | while (ret < 0) { |
3568 | ssh->send_ok = 1; |
3569 | crWaitUntil(!pktin); |
3570 | ret = get_userpass_input(s->cur_prompt, in, inlen); |
3571 | ssh->send_ok = 0; |
3572 | } |
3573 | if (!ret) { |
3574 | /* Failed to get a passphrase. Terminate. */ |
3575 | free_prompts(s->cur_prompt); |
3576 | ssh_disconnect(ssh, NULL, "Unable to authenticate", |
3577 | 0, TRUE); |
3578 | crStop(0); |
3579 | } |
3580 | passphrase = dupstr(s->cur_prompt->prompts[0]->result); |
3581 | free_prompts(s->cur_prompt); |
3582 | } |
3583 | /* |
3584 | * Try decrypting key with passphrase. |
3585 | */ |
3586 | ret = loadrsakey(&ssh->cfg.keyfile, &s->key, passphrase, |
3587 | &error); |
3588 | if (passphrase) { |
3589 | memset(passphrase, 0, strlen(passphrase)); |
3590 | sfree(passphrase); |
3591 | } |
3592 | if (ret == 1) { |
3593 | /* Correct passphrase. */ |
3594 | got_passphrase = TRUE; |
3595 | } else if (ret == 0) { |
3596 | c_write_str(ssh, "Couldn't load private key from "); |
3597 | c_write_str(ssh, filename_to_str(&ssh->cfg.keyfile)); |
3598 | c_write_str(ssh, " ("); |
3599 | c_write_str(ssh, error); |
3600 | c_write_str(ssh, ").\r\n"); |
3601 | got_passphrase = FALSE; |
3602 | break; /* go and try something else */ |
3603 | } else if (ret == -1) { |
3604 | c_write_str(ssh, "Wrong passphrase.\r\n"); /* FIXME */ |
edd0cb8a |
3605 | got_passphrase = FALSE; |
3606 | /* and try again */ |
43536490 |
3607 | } else { |
3608 | assert(0 && "unexpected return from loadrsakey()"); |
edc23a8a |
3609 | got_passphrase = FALSE; /* placate optimisers */ |
edd0cb8a |
3610 | } |
3611 | } |
3612 | |
3613 | if (got_passphrase) { |
3614 | |
3615 | /* |
3616 | * Send a public key attempt. |
3617 | */ |
3618 | send_packet(ssh, SSH1_CMSG_AUTH_RSA, |
3619 | PKT_BIGNUM, s->key.modulus, PKT_END); |
3620 | |
3621 | crWaitUntil(pktin); |
3622 | if (pktin->type == SSH1_SMSG_FAILURE) { |
3623 | c_write_str(ssh, "Server refused our public key.\r\n"); |
7b575324 |
3624 | continue; /* go and try something else */ |
edd0cb8a |
3625 | } |
3626 | if (pktin->type != SSH1_SMSG_AUTH_RSA_CHALLENGE) { |
3627 | bombout(("Bizarre response to offer of public key")); |
3628 | crStop(0); |
3629 | } |
3630 | |
3631 | { |
3632 | int i; |
3633 | unsigned char buffer[32]; |
3634 | Bignum challenge, response; |
3635 | |
3636 | if ((challenge = ssh1_pkt_getmp(pktin)) == NULL) { |
3637 | bombout(("Server's RSA challenge was badly formatted")); |
3638 | crStop(0); |
3639 | } |
3640 | response = rsadecrypt(challenge, &s->key); |
3641 | freebn(s->key.private_exponent);/* burn the evidence */ |
3642 | |
3643 | for (i = 0; i < 32; i++) { |
3644 | buffer[i] = bignum_byte(response, 31 - i); |
3645 | } |
3646 | |
3647 | MD5Init(&md5c); |
3648 | MD5Update(&md5c, buffer, 32); |
3649 | MD5Update(&md5c, s->session_id, 16); |
3650 | MD5Final(buffer, &md5c); |
3651 | |
3652 | send_packet(ssh, SSH1_CMSG_AUTH_RSA_RESPONSE, |
3653 | PKT_DATA, buffer, 16, PKT_END); |
3654 | |
3655 | freebn(challenge); |
3656 | freebn(response); |
3657 | } |
3658 | |
3659 | crWaitUntil(pktin); |
3660 | if (pktin->type == SSH1_SMSG_FAILURE) { |
3661 | if (flags & FLAG_VERBOSE) |
3662 | c_write_str(ssh, "Failed to authenticate with" |
3663 | " our public key.\r\n"); |
7b575324 |
3664 | continue; /* go and try something else */ |
edd0cb8a |
3665 | } else if (pktin->type != SSH1_SMSG_SUCCESS) { |
3666 | bombout(("Bizarre response to RSA authentication response")); |
3667 | crStop(0); |
3668 | } |
3669 | |
3670 | break; /* we're through! */ |
3671 | } |
3672 | |
3673 | } |
3674 | |
3675 | /* |
3676 | * Otherwise, try various forms of password-like authentication. |
3677 | */ |
3678 | s->cur_prompt = new_prompts(ssh->frontend); |
32874aea |
3679 | |
86916870 |
3680 | if (ssh->cfg.try_tis_auth && |
51470298 |
3681 | (s->supported_auths_mask & (1 << SSH1_AUTH_TIS)) && |
3682 | !s->tis_auth_refused) { |
3683 | s->pwpkt_type = SSH1_CMSG_AUTH_TIS_RESPONSE; |
32874aea |
3684 | logevent("Requested TIS authentication"); |
51470298 |
3685 | send_packet(ssh, SSH1_CMSG_AUTH_TIS, PKT_END); |
ff3187f6 |
3686 | crWaitUntil(pktin); |
3687 | if (pktin->type != SSH1_SMSG_AUTH_TIS_CHALLENGE) { |
32874aea |
3688 | logevent("TIS authentication declined"); |
3689 | if (flags & FLAG_INTERACTIVE) |
51470298 |
3690 | c_write_str(ssh, "TIS authentication refused.\r\n"); |
3691 | s->tis_auth_refused = 1; |
614a20a0 |
3692 | continue; |
32874aea |
3693 | } else { |
0016d70b |
3694 | char *challenge; |
3695 | int challengelen; |
edd0cb8a |
3696 | char *instr_suf, *prompt; |
0016d70b |
3697 | |
ff3187f6 |
3698 | ssh_pkt_getstring(pktin, &challenge, &challengelen); |
0016d70b |
3699 | if (!challenge) { |
3700 | bombout(("TIS challenge packet was badly formed")); |
3701 | crStop(0); |
3702 | } |
32874aea |
3703 | logevent("Received TIS challenge"); |
edd0cb8a |
3704 | s->cur_prompt->to_server = TRUE; |
3705 | s->cur_prompt->name = dupstr("SSH TIS authentication"); |
614a20a0 |
3706 | /* Prompt heuristic comes from OpenSSH */ |
edd0cb8a |
3707 | if (memchr(challenge, '\n', challengelen)) { |
3708 | instr_suf = dupstr(""); |
3709 | prompt = dupprintf("%.*s", challengelen, challenge); |
3710 | } else { |
3711 | instr_suf = dupprintf("%.*s", challengelen, challenge); |
3712 | prompt = dupstr("Response: "); |
3713 | } |
3714 | s->cur_prompt->instruction = |
3715 | dupprintf("Using TIS authentication.%s%s", |
3716 | (*instr_suf) ? "\n" : "", |
3717 | instr_suf); |
3718 | s->cur_prompt->instr_reqd = TRUE; |
3719 | add_prompt(s->cur_prompt, prompt, FALSE, SSH_MAX_PASSWORD_LEN); |
3720 | sfree(instr_suf); |
32874aea |
3721 | } |
3722 | } |
86916870 |
3723 | if (ssh->cfg.try_tis_auth && |
51470298 |
3724 | (s->supported_auths_mask & (1 << SSH1_AUTH_CCARD)) && |
3725 | !s->ccard_auth_refused) { |
3726 | s->pwpkt_type = SSH1_CMSG_AUTH_CCARD_RESPONSE; |
32874aea |
3727 | logevent("Requested CryptoCard authentication"); |
51470298 |
3728 | send_packet(ssh, SSH1_CMSG_AUTH_CCARD, PKT_END); |
ff3187f6 |
3729 | crWaitUntil(pktin); |
3730 | if (pktin->type != SSH1_SMSG_AUTH_CCARD_CHALLENGE) { |
32874aea |
3731 | logevent("CryptoCard authentication declined"); |
51470298 |
3732 | c_write_str(ssh, "CryptoCard authentication refused.\r\n"); |
3733 | s->ccard_auth_refused = 1; |
614a20a0 |
3734 | continue; |
32874aea |
3735 | } else { |
0016d70b |
3736 | char *challenge; |
3737 | int challengelen; |
edd0cb8a |
3738 | char *instr_suf, *prompt; |
0016d70b |
3739 | |
ff3187f6 |
3740 | ssh_pkt_getstring(pktin, &challenge, &challengelen); |
0016d70b |
3741 | if (!challenge) { |
3742 | bombout(("CryptoCard challenge packet was badly formed")); |
3743 | crStop(0); |
3744 | } |
32874aea |
3745 | logevent("Received CryptoCard challenge"); |
edd0cb8a |
3746 | s->cur_prompt->to_server = TRUE; |
3747 | s->cur_prompt->name = dupstr("SSH CryptoCard authentication"); |
3748 | s->cur_prompt->name_reqd = FALSE; |
3749 | /* Prompt heuristic comes from OpenSSH */ |
3750 | if (memchr(challenge, '\n', challengelen)) { |
3751 | instr_suf = dupstr(""); |
3752 | prompt = dupprintf("%.*s", challengelen, challenge); |
3753 | } else { |
3754 | instr_suf = dupprintf("%.*s", challengelen, challenge); |
3755 | prompt = dupstr("Response: "); |
3756 | } |
3757 | s->cur_prompt->instruction = |
3758 | dupprintf("Using CryptoCard authentication.%s%s", |
3759 | (*instr_suf) ? "\n" : "", |
3760 | instr_suf); |
3761 | s->cur_prompt->instr_reqd = TRUE; |
3762 | add_prompt(s->cur_prompt, prompt, FALSE, SSH_MAX_PASSWORD_LEN); |
3763 | sfree(instr_suf); |
32874aea |
3764 | } |
3765 | } |
51470298 |
3766 | if (s->pwpkt_type == SSH1_CMSG_AUTH_PASSWORD) { |
edd0cb8a |
3767 | s->cur_prompt->to_server = TRUE; |
3768 | s->cur_prompt->name = dupstr("SSH password"); |
3769 | add_prompt(s->cur_prompt, dupprintf("%.90s@%.90s's password: ", |
3770 | s->username, ssh->savedhost), |
3771 | FALSE, SSH_MAX_PASSWORD_LEN); |
32874aea |
3772 | } |
a52f067e |
3773 | |
614a20a0 |
3774 | /* |
3775 | * Show password prompt, having first obtained it via a TIS |
3776 | * or CryptoCard exchange if we're doing TIS or CryptoCard |
3777 | * authentication. |
3778 | */ |
edd0cb8a |
3779 | { |
3780 | int ret; /* need not be kept over crReturn */ |
3781 | ret = get_userpass_input(s->cur_prompt, NULL, 0); |
3782 | while (ret < 0) { |
3783 | ssh->send_ok = 1; |
3784 | crWaitUntil(!pktin); |
3785 | ret = get_userpass_input(s->cur_prompt, in, inlen); |
3786 | ssh->send_ok = 0; |
3787 | } |
3788 | if (!ret) { |
32874aea |
3789 | /* |
edd0cb8a |
3790 | * Failed to get a password (for example |
32874aea |
3791 | * because one was supplied on the command line |
3792 | * which has already failed to work). Terminate. |
3793 | */ |
edd0cb8a |
3794 | free_prompts(s->cur_prompt); |
3795 | ssh_disconnect(ssh, NULL, "Unable to authenticate", 0, TRUE); |
3796 | crStop(0); |
32874aea |
3797 | } |
32874aea |
3798 | } |
3799 | |
edd0cb8a |
3800 | if (s->pwpkt_type == SSH1_CMSG_AUTH_PASSWORD) { |
32874aea |
3801 | /* |
edd0cb8a |
3802 | * Defence against traffic analysis: we send a |
3803 | * whole bunch of packets containing strings of |
3804 | * different lengths. One of these strings is the |
3805 | * password, in a SSH1_CMSG_AUTH_PASSWORD packet. |
3806 | * The others are all random data in |
3807 | * SSH1_MSG_IGNORE packets. This way a passive |
3808 | * listener can't tell which is the password, and |
3809 | * hence can't deduce the password length. |
3810 | * |
3811 | * Anybody with a password length greater than 16 |
3812 | * bytes is going to have enough entropy in their |
3813 | * password that a listener won't find it _that_ |
3814 | * much help to know how long it is. So what we'll |
3815 | * do is: |
3816 | * |
3817 | * - if password length < 16, we send 15 packets |
3818 | * containing string lengths 1 through 15 |
3819 | * |
3820 | * - otherwise, we let N be the nearest multiple |
3821 | * of 8 below the password length, and send 8 |
3822 | * packets containing string lengths N through |
3823 | * N+7. This won't obscure the order of |
3824 | * magnitude of the password length, but it will |
3825 | * introduce a bit of extra uncertainty. |
3826 | * |
bf982899 |
3827 | * A few servers can't deal with SSH1_MSG_IGNORE, at |
3828 | * least in this context. For these servers, we need |
3829 | * an alternative defence. We make use of the fact |
3830 | * that the password is interpreted as a C string: |
3831 | * so we can append a NUL, then some random data. |
edd0cb8a |
3832 | * |
bf982899 |
3833 | * A few servers can deal with neither SSH1_MSG_IGNORE |
3834 | * here _nor_ a padded password string. |
3835 | * For these servers we are left with no defences |
edd0cb8a |
3836 | * against password length sniffing. |
32874aea |
3837 | */ |
bf982899 |
3838 | if (!(ssh->remote_bugs & BUG_CHOKES_ON_SSH1_IGNORE) && |
3839 | !(ssh->remote_bugs & BUG_NEEDS_SSH1_PLAIN_PASSWORD)) { |
32874aea |
3840 | /* |
edd0cb8a |
3841 | * The server can deal with SSH1_MSG_IGNORE, so |
3842 | * we can use the primary defence. |
32874aea |
3843 | */ |
edd0cb8a |
3844 | int bottom, top, pwlen, i; |
3845 | char *randomstr; |
32874aea |
3846 | |
edd0cb8a |
3847 | pwlen = strlen(s->cur_prompt->prompts[0]->result); |
3848 | if (pwlen < 16) { |
3849 | bottom = 0; /* zero length passwords are OK! :-) */ |
3850 | top = 15; |
3851 | } else { |
3852 | bottom = pwlen & ~7; |
3853 | top = bottom + 7; |
3854 | } |
32874aea |
3855 | |
edd0cb8a |
3856 | assert(pwlen >= bottom && pwlen <= top); |
32874aea |
3857 | |
edd0cb8a |
3858 | randomstr = snewn(top + 1, char); |
32874aea |
3859 | |
edd0cb8a |
3860 | for (i = bottom; i <= top; i++) { |
3861 | if (i == pwlen) { |
3862 | defer_packet(ssh, s->pwpkt_type, |
3863 | PKTT_PASSWORD, PKT_STR, |
3864 | s->cur_prompt->prompts[0]->result, |
3865 | PKTT_OTHER, PKT_END); |
3866 | } else { |
3867 | for (j = 0; j < i; j++) { |
3868 | do { |
3869 | randomstr[j] = random_byte(); |
3870 | } while (randomstr[j] == '\0'); |
32874aea |
3871 | } |
edd0cb8a |
3872 | randomstr[i] = '\0'; |
3873 | defer_packet(ssh, SSH1_MSG_IGNORE, |
3874 | PKT_STR, randomstr, PKT_END); |
32874aea |
3875 | } |
edd0cb8a |
3876 | } |
3877 | logevent("Sending password with camouflage packets"); |
3878 | ssh_pkt_defersend(ssh); |
3879 | sfree(randomstr); |
3880 | } |
3881 | else if (!(ssh->remote_bugs & BUG_NEEDS_SSH1_PLAIN_PASSWORD)) { |
3882 | /* |
3883 | * The server can't deal with SSH1_MSG_IGNORE |
3884 | * but can deal with padded passwords, so we |
3885 | * can use the secondary defence. |
3886 | */ |
3887 | char string[64]; |
3888 | char *ss; |
3889 | int len; |
3890 | |
3891 | len = strlen(s->cur_prompt->prompts[0]->result); |
3892 | if (len < sizeof(string)) { |
3893 | ss = string; |
3894 | strcpy(string, s->cur_prompt->prompts[0]->result); |
3895 | len++; /* cover the zero byte */ |
3896 | while (len < sizeof(string)) { |
3897 | string[len++] = (char) random_byte(); |
bd358db1 |
3898 | } |
bd358db1 |
3899 | } else { |
edd0cb8a |
3900 | ss = s->cur_prompt->prompts[0]->result; |
32874aea |
3901 | } |
edd0cb8a |
3902 | logevent("Sending length-padded password"); |
9a10ecf4 |
3903 | send_packet(ssh, s->pwpkt_type, PKTT_PASSWORD, |
edd0cb8a |
3904 | PKT_INT, len, PKT_DATA, ss, len, |
3905 | PKTT_OTHER, PKT_END); |
3906 | } else { |
3907 | /* |
bf982899 |
3908 | * The server is believed unable to cope with |
3909 | * any of our password camouflage methods. |
edd0cb8a |
3910 | */ |
3911 | int len; |
3912 | len = strlen(s->cur_prompt->prompts[0]->result); |
3913 | logevent("Sending unpadded password"); |
3914 | send_packet(ssh, s->pwpkt_type, |
3915 | PKTT_PASSWORD, PKT_INT, len, |
3916 | PKT_DATA, s->cur_prompt->prompts[0]->result, len, |
3917 | PKTT_OTHER, PKT_END); |
32874aea |
3918 | } |
edd0cb8a |
3919 | } else { |
3920 | send_packet(ssh, s->pwpkt_type, PKTT_PASSWORD, |
3921 | PKT_STR, s->cur_prompt->prompts[0]->result, |
3922 | PKTT_OTHER, PKT_END); |
32874aea |
3923 | } |
c5e9c988 |
3924 | logevent("Sent password"); |
edd0cb8a |
3925 | free_prompts(s->cur_prompt); |
ff3187f6 |
3926 | crWaitUntil(pktin); |
3927 | if (pktin->type == SSH1_SMSG_FAILURE) { |
32874aea |
3928 | if (flags & FLAG_VERBOSE) |
51470298 |
3929 | c_write_str(ssh, "Access denied\r\n"); |
c5e9c988 |
3930 | logevent("Authentication refused"); |
ff3187f6 |
3931 | } else if (pktin->type != SSH1_SMSG_SUCCESS) { |
3932 | bombout(("Strange packet received, type %d", pktin->type)); |
7ffdbc1a |
3933 | crStop(0); |
374330e2 |
3934 | } |
3935 | } |
3936 | |
edd0cb8a |
3937 | /* Clear up */ |
3938 | if (s->publickey_blob) { |
3939 | sfree(s->publickey_blob); |
3940 | sfree(s->publickey_comment); |
3941 | } |
3942 | |
c5e9c988 |
3943 | logevent("Authentication successful"); |
3944 | |
fb09bf1c |
3945 | crFinish(1); |
3946 | } |
3947 | |
32874aea |
3948 | void sshfwd_close(struct ssh_channel *c) |
3949 | { |
51470298 |
3950 | Ssh ssh = c->ssh; |
3951 | |
1ef619ae |
3952 | if (ssh->state == SSH_STATE_CLOSED) |
36f94d1f |
3953 | return; |
36f94d1f |
3954 | |
80e48603 |
3955 | if (c && !c->closes) { |
4ed34d25 |
3956 | /* |
64d6ff88 |
3957 | * If halfopen is true, we have sent |
4ed34d25 |
3958 | * CHANNEL_OPEN for this channel, but it hasn't even been |
3959 | * acknowledged by the server. So we must set a close flag |
3960 | * on it now, and then when the server acks the channel |
3961 | * open, we can close it then. |
3962 | */ |
64d6ff88 |
3963 | if (!c->halfopen) { |
51470298 |
3964 | if (ssh->version == 1) { |
3965 | send_packet(ssh, SSH1_MSG_CHANNEL_CLOSE, PKT_INT, c->remoteid, |
4ed34d25 |
3966 | PKT_END); |
3967 | } else { |
ff3187f6 |
3968 | struct Packet *pktout; |
3969 | pktout = ssh2_pkt_init(SSH2_MSG_CHANNEL_CLOSE); |
3970 | ssh2_pkt_adduint32(pktout, c->remoteid); |
3971 | ssh2_pkt_send(ssh, pktout); |
4ed34d25 |
3972 | } |
32874aea |
3973 | } |
0357890f |
3974 | c->closes = 1; /* sent MSG_CLOSE */ |
32874aea |
3975 | if (c->type == CHAN_X11) { |
3976 | c->u.x11.s = NULL; |
d74d141c |
3977 | logevent("Forwarded X11 connection terminated"); |
4ed34d25 |
3978 | } else if (c->type == CHAN_SOCKDATA || |
3979 | c->type == CHAN_SOCKDATA_DORMANT) { |
d74d141c |
3980 | c->u.pfd.s = NULL; |
3981 | logevent("Forwarded port closed"); |
32874aea |
3982 | } |
3983 | } |
3984 | } |
3985 | |
5471d09a |
3986 | int sshfwd_write(struct ssh_channel *c, char *buf, int len) |
32874aea |
3987 | { |
51470298 |
3988 | Ssh ssh = c->ssh; |
3989 | |
1ef619ae |
3990 | if (ssh->state == SSH_STATE_CLOSED) |
36f94d1f |
3991 | return 0; |
36f94d1f |
3992 | |
51470298 |
3993 | if (ssh->version == 1) { |
3994 | send_packet(ssh, SSH1_MSG_CHANNEL_DATA, |
32874aea |
3995 | PKT_INT, c->remoteid, |
9a10ecf4 |
3996 | PKTT_DATA, |
3997 | PKT_INT, len, PKT_DATA, buf, len, |
3998 | PKTT_OTHER, PKT_END); |
5471d09a |
3999 | /* |
2e85c969 |
4000 | * In SSH-1 we can return 0 here - implying that forwarded |
5471d09a |
4001 | * connections are never individually throttled - because |
4002 | * the only circumstance that can cause throttling will be |
4003 | * the whole SSH connection backing up, in which case |
4004 | * _everything_ will be throttled as a whole. |
4005 | */ |
4006 | return 0; |
783415f8 |
4007 | } else { |
32874aea |
4008 | ssh2_add_channel_data(c, buf, len); |
5471d09a |
4009 | return ssh2_try_send(c); |
4010 | } |
4011 | } |
4012 | |
4013 | void sshfwd_unthrottle(struct ssh_channel *c, int bufsize) |
4014 | { |
51470298 |
4015 | Ssh ssh = c->ssh; |
4016 | |
1ef619ae |
4017 | if (ssh->state == SSH_STATE_CLOSED) |
36f94d1f |
4018 | return; |
36f94d1f |
4019 | |
51470298 |
4020 | if (ssh->version == 1) { |
5471d09a |
4021 | if (c->v.v1.throttling && bufsize < SSH1_BUFFER_LIMIT) { |
4022 | c->v.v1.throttling = 0; |
51470298 |
4023 | ssh1_throttle(ssh, -1); |
5471d09a |
4024 | } |
4025 | } else { |
4026 | ssh2_set_window(c, OUR_V2_WINSIZE - bufsize); |
783415f8 |
4027 | } |
9c964e85 |
4028 | } |
4029 | |
06fadff5 |
4030 | static void ssh_queueing_handler(Ssh ssh, struct Packet *pktin) |
4031 | { |
4032 | struct queued_handler *qh = ssh->qhead; |
4033 | |
4034 | assert(qh != NULL); |
4035 | |
4036 | assert(pktin->type == qh->msg1 || pktin->type == qh->msg2); |
4037 | |
4038 | if (qh->msg1 > 0) { |
4039 | assert(ssh->packet_dispatch[qh->msg1] == ssh_queueing_handler); |
4040 | ssh->packet_dispatch[qh->msg1] = NULL; |
4041 | } |
4042 | if (qh->msg2 > 0) { |
4043 | assert(ssh->packet_dispatch[qh->msg2] == ssh_queueing_handler); |
4044 | ssh->packet_dispatch[qh->msg2] = NULL; |
4045 | } |
4046 | |
4047 | if (qh->next) { |
4048 | ssh->qhead = qh->next; |
4049 | |
4050 | if (ssh->qhead->msg1 > 0) { |
4051 | assert(ssh->packet_dispatch[ssh->qhead->msg1] == NULL); |
4052 | ssh->packet_dispatch[ssh->qhead->msg1] = ssh_queueing_handler; |
4053 | } |
4054 | if (ssh->qhead->msg2 > 0) { |
4055 | assert(ssh->packet_dispatch[ssh->qhead->msg2] == NULL); |
4056 | ssh->packet_dispatch[ssh->qhead->msg2] = ssh_queueing_handler; |
4057 | } |
4058 | } else { |
4059 | ssh->qhead = ssh->qtail = NULL; |
4060 | ssh->packet_dispatch[pktin->type] = NULL; |
4061 | } |
4062 | |
4063 | qh->handler(ssh, pktin, qh->ctx); |
4064 | |
4065 | sfree(qh); |
4066 | } |
4067 | |
4068 | static void ssh_queue_handler(Ssh ssh, int msg1, int msg2, |
4069 | chandler_fn_t handler, void *ctx) |
4070 | { |
4071 | struct queued_handler *qh; |
4072 | |
4073 | qh = snew(struct queued_handler); |
4074 | qh->msg1 = msg1; |
4075 | qh->msg2 = msg2; |
4076 | qh->handler = handler; |
4077 | qh->ctx = ctx; |
4078 | qh->next = NULL; |
4079 | |
4080 | if (ssh->qtail == NULL) { |
4081 | ssh->qhead = qh; |
4082 | |
4083 | if (qh->msg1 > 0) { |
4084 | assert(ssh->packet_dispatch[qh->msg1] == NULL); |
4085 | ssh->packet_dispatch[qh->msg1] = ssh_queueing_handler; |
4086 | } |
4087 | if (qh->msg2 > 0) { |
4088 | assert(ssh->packet_dispatch[qh->msg2] == NULL); |
4089 | ssh->packet_dispatch[qh->msg2] = ssh_queueing_handler; |
4090 | } |
4091 | } else { |
4092 | ssh->qtail->next = qh; |
4093 | } |
4094 | ssh->qtail = qh; |
4095 | } |
4096 | |
4097 | static void ssh_rportfwd_succfail(Ssh ssh, struct Packet *pktin, void *ctx) |
4098 | { |
4099 | struct ssh_rportfwd *rpf, *pf = (struct ssh_rportfwd *)ctx; |
4100 | |
4101 | if (pktin->type == (ssh->version == 1 ? SSH1_SMSG_SUCCESS : |
4102 | SSH2_MSG_REQUEST_SUCCESS)) { |
4103 | logeventf(ssh, "Remote port forwarding from %s enabled", |
4104 | pf->sportdesc); |
4105 | } else { |
4106 | logeventf(ssh, "Remote port forwarding from %s refused", |
4107 | pf->sportdesc); |
4108 | |
4109 | rpf = del234(ssh->rportfwds, pf); |
4110 | assert(rpf == pf); |
fda2feb1 |
4111 | free_rportfwd(pf); |
06fadff5 |
4112 | } |
4113 | } |
4114 | |
4115 | static void ssh_setup_portfwd(Ssh ssh, const Config *cfg) |
4116 | { |
84328ddb |
4117 | const char *portfwd_strptr = cfg->portfwd; |
4118 | struct ssh_portfwd *epf; |
4119 | int i; |
06fadff5 |
4120 | |
fda2feb1 |
4121 | if (!ssh->portfwds) { |
4122 | ssh->portfwds = newtree234(ssh_portcmp); |
4123 | } else { |
4124 | /* |
4125 | * Go through the existing port forwardings and tag them |
84328ddb |
4126 | * with status==DESTROY. Any that we want to keep will be |
4127 | * re-enabled (status==KEEP) as we go through the |
4128 | * configuration and find out which bits are the same as |
4129 | * they were before. |
fda2feb1 |
4130 | */ |
4131 | struct ssh_portfwd *epf; |
4132 | int i; |
4133 | for (i = 0; (epf = index234(ssh->portfwds, i)) != NULL; i++) |
84328ddb |
4134 | epf->status = DESTROY; |
fda2feb1 |
4135 | } |
4136 | |
06fadff5 |
4137 | while (*portfwd_strptr) { |
84328ddb |
4138 | char address_family, type; |
4139 | int sport,dport,sserv,dserv; |
4140 | char sports[256], dports[256], saddr[256], host[256]; |
4141 | int n; |
4142 | |
05581745 |
4143 | address_family = 'A'; |
4144 | type = 'L'; |
84328ddb |
4145 | if (*portfwd_strptr == 'A' || |
4146 | *portfwd_strptr == '4' || |
4147 | *portfwd_strptr == '6') |
4148 | address_family = *portfwd_strptr++; |
4149 | if (*portfwd_strptr == 'L' || |
4150 | *portfwd_strptr == 'R' || |
4151 | *portfwd_strptr == 'D') |
4152 | type = *portfwd_strptr++; |
05581745 |
4153 | |
06fadff5 |
4154 | saddr[0] = '\0'; |
05581745 |
4155 | |
06fadff5 |
4156 | n = 0; |
4157 | while (*portfwd_strptr && *portfwd_strptr != '\t') { |
4158 | if (*portfwd_strptr == ':') { |
4159 | /* |
4160 | * We've seen a colon in the middle of the |
4161 | * source port number. This means that |
4162 | * everything we've seen until now is the |
4163 | * source _address_, so we'll move it into |
4164 | * saddr and start sports from the beginning |
4165 | * again. |
4166 | */ |
4167 | portfwd_strptr++; |
4168 | sports[n] = '\0'; |
4169 | if (ssh->version == 1 && type == 'R') { |
2e85c969 |
4170 | logeventf(ssh, "SSH-1 cannot handle remote source address " |
06fadff5 |
4171 | "spec \"%s\"; ignoring", sports); |
4172 | } else |
4173 | strcpy(saddr, sports); |
4174 | n = 0; |
4175 | } |
019164b0 |
4176 | if (n < lenof(sports)-1) sports[n++] = *portfwd_strptr++; |
06fadff5 |
4177 | } |
4178 | sports[n] = 0; |
4179 | if (type != 'D') { |
4180 | if (*portfwd_strptr == '\t') |
4181 | portfwd_strptr++; |
4182 | n = 0; |
4183 | while (*portfwd_strptr && *portfwd_strptr != ':') { |
019164b0 |
4184 | if (n < lenof(host)-1) host[n++] = *portfwd_strptr++; |
06fadff5 |
4185 | } |
4186 | host[n] = 0; |
4187 | if (*portfwd_strptr == ':') |
4188 | portfwd_strptr++; |
4189 | n = 0; |
4190 | while (*portfwd_strptr) { |
019164b0 |
4191 | if (n < lenof(dports)-1) dports[n++] = *portfwd_strptr++; |
06fadff5 |
4192 | } |
4193 | dports[n] = 0; |
4194 | portfwd_strptr++; |
4195 | dport = atoi(dports); |
4196 | dserv = 0; |
4197 | if (dport == 0) { |
4198 | dserv = 1; |
4199 | dport = net_service_lookup(dports); |
4200 | if (!dport) { |
4201 | logeventf(ssh, "Service lookup failed for destination" |
4202 | " port \"%s\"", dports); |
4203 | } |
4204 | } |
4205 | } else { |
4206 | while (*portfwd_strptr) portfwd_strptr++; |
a9e72926 |
4207 | host[0] = 0; |
4208 | dports[0] = 0; |
06fadff5 |
4209 | dport = dserv = -1; |
4210 | portfwd_strptr++; /* eat the NUL and move to next one */ |
4211 | } |
4212 | sport = atoi(sports); |
4213 | sserv = 0; |
4214 | if (sport == 0) { |
4215 | sserv = 1; |
4216 | sport = net_service_lookup(sports); |
4217 | if (!sport) { |
4218 | logeventf(ssh, "Service lookup failed for source" |
4219 | " port \"%s\"", sports); |
4220 | } |
4221 | } |
4222 | if (sport && dport) { |
4223 | /* Set up a description of the source port. */ |
fda2feb1 |
4224 | struct ssh_portfwd *pfrec, *epfrec; |
fda2feb1 |
4225 | |
4226 | pfrec = snew(struct ssh_portfwd); |
4227 | pfrec->type = type; |
4228 | pfrec->saddr = *saddr ? dupstr(saddr) : NULL; |
3fe92132 |
4229 | pfrec->sserv = sserv ? dupstr(sports) : NULL; |
fda2feb1 |
4230 | pfrec->sport = sport; |
84328ddb |
4231 | pfrec->daddr = *host ? dupstr(host) : NULL; |
3fe92132 |
4232 | pfrec->dserv = dserv ? dupstr(dports) : NULL; |
fda2feb1 |
4233 | pfrec->dport = dport; |
4234 | pfrec->local = NULL; |
4235 | pfrec->remote = NULL; |
05581745 |
4236 | pfrec->addressfamily = (address_family == '4' ? ADDRTYPE_IPV4 : |
4237 | address_family == '6' ? ADDRTYPE_IPV6 : |
4238 | ADDRTYPE_UNSPEC); |
fda2feb1 |
4239 | |
4240 | epfrec = add234(ssh->portfwds, pfrec); |
4241 | if (epfrec != pfrec) { |
4242 | /* |
4243 | * We already have a port forwarding with precisely |
4244 | * these parameters. Hence, no need to do anything; |
84328ddb |
4245 | * simply tag the existing one as KEEP. |
fda2feb1 |
4246 | */ |
84328ddb |
4247 | epfrec->status = KEEP; |
fda2feb1 |
4248 | free_portfwd(pfrec); |
84328ddb |
4249 | } else { |
4250 | pfrec->status = CREATE; |
4251 | } |
4252 | } |
4253 | } |
4254 | |
4255 | /* |
4256 | * Now go through and destroy any port forwardings which were |
4257 | * not re-enabled. |
4258 | */ |
4259 | for (i = 0; (epf = index234(ssh->portfwds, i)) != NULL; i++) |
4260 | if (epf->status == DESTROY) { |
4261 | char *message; |
4262 | |
4263 | message = dupprintf("%s port forwarding from %s%s%d", |
4264 | epf->type == 'L' ? "local" : |
4265 | epf->type == 'R' ? "remote" : "dynamic", |
4266 | epf->saddr ? epf->saddr : "", |
4267 | epf->saddr ? ":" : "", |
4268 | epf->sport); |
4269 | |
4270 | if (epf->type != 'D') { |
4271 | char *msg2 = dupprintf("%s to %s:%d", message, |
4272 | epf->daddr, epf->dport); |
4273 | sfree(message); |
4274 | message = msg2; |
4275 | } |
4276 | |
4277 | logeventf(ssh, "Cancelling %s", message); |
4278 | sfree(message); |
4279 | |
4280 | if (epf->remote) { |
4281 | struct ssh_rportfwd *rpf = epf->remote; |
4282 | struct Packet *pktout; |
4283 | |
4284 | /* |
4285 | * Cancel the port forwarding at the server |
4286 | * end. |
4287 | */ |
4288 | if (ssh->version == 1) { |
4289 | /* |
4290 | * We cannot cancel listening ports on the |
2e85c969 |
4291 | * server side in SSH-1! There's no message |
84328ddb |
4292 | * to support it. Instead, we simply remove |
4293 | * the rportfwd record from the local end |
4294 | * so that any connections the server tries |
4295 | * to make on it are rejected. |
4296 | */ |
4297 | } else { |
4298 | pktout = ssh2_pkt_init(SSH2_MSG_GLOBAL_REQUEST); |
4299 | ssh2_pkt_addstring(pktout, "cancel-tcpip-forward"); |
4300 | ssh2_pkt_addbool(pktout, 0);/* _don't_ want reply */ |
4301 | if (epf->saddr) { |
4302 | ssh2_pkt_addstring(pktout, epf->saddr); |
4303 | } else if (ssh->cfg.rport_acceptall) { |
5188540b |
4304 | /* XXX: ssh->cfg.rport_acceptall may not represent |
4305 | * what was used to open the original connection, |
4306 | * since it's reconfigurable. */ |
84328ddb |
4307 | ssh2_pkt_addstring(pktout, "0.0.0.0"); |
4308 | } else { |
4309 | ssh2_pkt_addstring(pktout, "127.0.0.1"); |
4310 | } |
4311 | ssh2_pkt_adduint32(pktout, epf->sport); |
4312 | ssh2_pkt_send(ssh, pktout); |
4313 | } |
4314 | |
4315 | del234(ssh->rportfwds, rpf); |
4316 | free_rportfwd(rpf); |
4317 | } else if (epf->local) { |
4318 | pfd_terminate(epf->local); |
4319 | } |
4320 | |
4321 | delpos234(ssh->portfwds, i); |
4322 | free_portfwd(epf); |
4323 | i--; /* so we don't skip one in the list */ |
4324 | } |
4325 | |
4326 | /* |
4327 | * And finally, set up any new port forwardings (status==CREATE). |
4328 | */ |
4329 | for (i = 0; (epf = index234(ssh->portfwds, i)) != NULL; i++) |
4330 | if (epf->status == CREATE) { |
4331 | char *sportdesc, *dportdesc; |
3fe92132 |
4332 | sportdesc = dupprintf("%s%s%s%s%d%s", |
84328ddb |
4333 | epf->saddr ? epf->saddr : "", |
4334 | epf->saddr ? ":" : "", |
3fe92132 |
4335 | epf->sserv ? epf->sserv : "", |
4336 | epf->sserv ? "(" : "", |
4337 | epf->sport, |
4338 | epf->sserv ? ")" : ""); |
84328ddb |
4339 | if (epf->type == 'D') { |
4340 | dportdesc = NULL; |
4341 | } else { |
3fe92132 |
4342 | dportdesc = dupprintf("%s:%s%s%d%s", |
4343 | epf->daddr, |
4344 | epf->dserv ? epf->dserv : "", |
4345 | epf->dserv ? "(" : "", |
4346 | epf->dport, |
4347 | epf->dserv ? ")" : ""); |
84328ddb |
4348 | } |
05581745 |
4349 | |
84328ddb |
4350 | if (epf->type == 'L') { |
4351 | const char *err = pfd_addforward(epf->daddr, epf->dport, |
4352 | epf->saddr, epf->sport, |
5188540b |
4353 | ssh, cfg, |
84328ddb |
4354 | &epf->local, |
4355 | epf->addressfamily); |
4356 | |
4357 | logeventf(ssh, "Local %sport %s forwarding to %s%s%s", |
4358 | epf->addressfamily == ADDRTYPE_IPV4 ? "IPv4 " : |
4359 | epf->addressfamily == ADDRTYPE_IPV6 ? "IPv6 " : "", |
4360 | sportdesc, dportdesc, |
4361 | err ? " failed: " : "", err ? err : ""); |
4362 | } else if (epf->type == 'D') { |
06fadff5 |
4363 | const char *err = pfd_addforward(NULL, -1, |
84328ddb |
4364 | epf->saddr, epf->sport, |
5188540b |
4365 | ssh, cfg, |
84328ddb |
4366 | &epf->local, |
4367 | epf->addressfamily); |
4368 | |
4369 | logeventf(ssh, "Local %sport %s SOCKS dynamic forwarding%s%s", |
4370 | epf->addressfamily == ADDRTYPE_IPV4 ? "IPv4 " : |
4371 | epf->addressfamily == ADDRTYPE_IPV6 ? "IPv6 " : "", |
4372 | sportdesc, |
4373 | err ? " failed: " : "", err ? err : ""); |
06fadff5 |
4374 | } else { |
4375 | struct ssh_rportfwd *pf; |
4376 | |
4377 | /* |
4378 | * Ensure the remote port forwardings tree exists. |
4379 | */ |
4380 | if (!ssh->rportfwds) { |
4381 | if (ssh->version == 1) |
4382 | ssh->rportfwds = newtree234(ssh_rportcmp_ssh1); |
4383 | else |
4384 | ssh->rportfwds = newtree234(ssh_rportcmp_ssh2); |
4385 | } |
4386 | |
4387 | pf = snew(struct ssh_rportfwd); |
84328ddb |
4388 | strncpy(pf->dhost, epf->daddr, lenof(pf->dhost)-1); |
4389 | pf->dhost[lenof(pf->dhost)-1] = '\0'; |
4390 | pf->dport = epf->dport; |
4391 | pf->sport = epf->sport; |
06fadff5 |
4392 | if (add234(ssh->rportfwds, pf) != pf) { |
4393 | logeventf(ssh, "Duplicate remote port forwarding to %s:%d", |
84328ddb |
4394 | epf->daddr, epf->dport); |
06fadff5 |
4395 | sfree(pf); |
4396 | } else { |
4397 | logeventf(ssh, "Requesting remote port %s" |
84328ddb |
4398 | " forward to %s", sportdesc, dportdesc); |
06fadff5 |
4399 | |
4400 | pf->sportdesc = sportdesc; |
4401 | sportdesc = NULL; |
84328ddb |
4402 | epf->remote = pf; |
4403 | pf->pfrec = epf; |
06fadff5 |
4404 | |
4405 | if (ssh->version == 1) { |
4406 | send_packet(ssh, SSH1_CMSG_PORT_FORWARD_REQUEST, |
84328ddb |
4407 | PKT_INT, epf->sport, |
4408 | PKT_STR, epf->daddr, |
4409 | PKT_INT, epf->dport, |
06fadff5 |
4410 | PKT_END); |
4411 | ssh_queue_handler(ssh, SSH1_SMSG_SUCCESS, |
4412 | SSH1_SMSG_FAILURE, |
4413 | ssh_rportfwd_succfail, pf); |
4414 | } else { |
4415 | struct Packet *pktout; |
4416 | pktout = ssh2_pkt_init(SSH2_MSG_GLOBAL_REQUEST); |
4417 | ssh2_pkt_addstring(pktout, "tcpip-forward"); |
4418 | ssh2_pkt_addbool(pktout, 1);/* want reply */ |
84328ddb |
4419 | if (epf->saddr) { |
4420 | ssh2_pkt_addstring(pktout, epf->saddr); |
5188540b |
4421 | } else if (cfg->rport_acceptall) { |
06fadff5 |
4422 | ssh2_pkt_addstring(pktout, "0.0.0.0"); |
4423 | } else { |
4424 | ssh2_pkt_addstring(pktout, "127.0.0.1"); |
4425 | } |
84328ddb |
4426 | ssh2_pkt_adduint32(pktout, epf->sport); |
06fadff5 |
4427 | ssh2_pkt_send(ssh, pktout); |
4428 | |
4429 | ssh_queue_handler(ssh, SSH2_MSG_REQUEST_SUCCESS, |
4430 | SSH2_MSG_REQUEST_FAILURE, |
4431 | ssh_rportfwd_succfail, pf); |
4432 | } |
4433 | } |
4434 | } |
4435 | sfree(sportdesc); |
84328ddb |
4436 | sfree(dportdesc); |
06fadff5 |
4437 | } |
06fadff5 |
4438 | } |
4439 | |
51df0ab5 |
4440 | static void ssh1_smsg_stdout_stderr_data(Ssh ssh, struct Packet *pktin) |
4441 | { |
4442 | char *string; |
4443 | int stringlen, bufsize; |
4444 | |
4445 | ssh_pkt_getstring(pktin, &string, &stringlen); |
4446 | if (string == NULL) { |
4447 | bombout(("Incoming terminal data packet was badly formed")); |
4448 | return; |
4449 | } |
4450 | |
4451 | bufsize = from_backend(ssh->frontend, pktin->type == SSH1_SMSG_STDERR_DATA, |
4452 | string, stringlen); |
4453 | if (!ssh->v1_stdout_throttling && bufsize > SSH1_BUFFER_LIMIT) { |
4454 | ssh->v1_stdout_throttling = 1; |
4455 | ssh1_throttle(ssh, +1); |
4456 | } |
4457 | } |
4458 | |
4459 | static void ssh1_smsg_x11_open(Ssh ssh, struct Packet *pktin) |
4460 | { |
4461 | /* Remote side is trying to open a channel to talk to our |
4462 | * X-Server. Give them back a local channel number. */ |
4463 | struct ssh_channel *c; |
4464 | int remoteid = ssh_pkt_getuint32(pktin); |
4465 | |
4466 | logevent("Received X11 connect request"); |
4467 | /* Refuse if X11 forwarding is disabled. */ |
4468 | if (!ssh->X11_fwd_enabled) { |
4469 | send_packet(ssh, SSH1_MSG_CHANNEL_OPEN_FAILURE, |
4470 | PKT_INT, remoteid, PKT_END); |
4471 | logevent("Rejected X11 connect request"); |
4472 | } else { |
4473 | c = snew(struct ssh_channel); |
4474 | c->ssh = ssh; |
4475 | |
4476 | if (x11_init(&c->u.x11.s, ssh->cfg.x11_display, c, |
4477 | ssh->x11auth, NULL, -1, &ssh->cfg) != NULL) { |
4478 | logevent("Opening X11 forward connection failed"); |
4479 | sfree(c); |
4480 | send_packet(ssh, SSH1_MSG_CHANNEL_OPEN_FAILURE, |
4481 | PKT_INT, remoteid, PKT_END); |
4482 | } else { |
4483 | logevent |
4484 | ("Opening X11 forward connection succeeded"); |
4485 | c->remoteid = remoteid; |
64d6ff88 |
4486 | c->halfopen = FALSE; |
51df0ab5 |
4487 | c->localid = alloc_channel_id(ssh); |
4488 | c->closes = 0; |
4489 | c->v.v1.throttling = 0; |
4490 | c->type = CHAN_X11; /* identify channel type */ |
4491 | add234(ssh->channels, c); |
4492 | send_packet(ssh, SSH1_MSG_CHANNEL_OPEN_CONFIRMATION, |
4493 | PKT_INT, c->remoteid, PKT_INT, |
4494 | c->localid, PKT_END); |
4495 | logevent("Opened X11 forward channel"); |
4496 | } |
4497 | } |
4498 | } |
4499 | |
4500 | static void ssh1_smsg_agent_open(Ssh ssh, struct Packet *pktin) |
4501 | { |
4502 | /* Remote side is trying to open a channel to talk to our |
4503 | * agent. Give them back a local channel number. */ |
4504 | struct ssh_channel *c; |
4505 | int remoteid = ssh_pkt_getuint32(pktin); |
4506 | |
4507 | /* Refuse if agent forwarding is disabled. */ |
4508 | if (!ssh->agentfwd_enabled) { |
4509 | send_packet(ssh, SSH1_MSG_CHANNEL_OPEN_FAILURE, |
4510 | PKT_INT, remoteid, PKT_END); |
4511 | } else { |
4512 | c = snew(struct ssh_channel); |
4513 | c->ssh = ssh; |
4514 | c->remoteid = remoteid; |
64d6ff88 |
4515 | c->halfopen = FALSE; |
51df0ab5 |
4516 | c->localid = alloc_channel_id(ssh); |
4517 | c->closes = 0; |
4518 | c->v.v1.throttling = 0; |
4519 | c->type = CHAN_AGENT; /* identify channel type */ |
4520 | c->u.a.lensofar = 0; |
4521 | add234(ssh->channels, c); |
4522 | send_packet(ssh, SSH1_MSG_CHANNEL_OPEN_CONFIRMATION, |
4523 | PKT_INT, c->remoteid, PKT_INT, c->localid, |
4524 | PKT_END); |
4525 | } |
4526 | } |
4527 | |
4528 | static void ssh1_msg_port_open(Ssh ssh, struct Packet *pktin) |
4529 | { |
4530 | /* Remote side is trying to open a channel to talk to a |
4531 | * forwarded port. Give them back a local channel number. */ |
4532 | struct ssh_channel *c; |
05581745 |
4533 | struct ssh_rportfwd pf, *pfp; |
51df0ab5 |
4534 | int remoteid; |
4535 | int hostsize, port; |
fb983202 |
4536 | char *host; |
51df0ab5 |
4537 | const char *e; |
4538 | c = snew(struct ssh_channel); |
4539 | c->ssh = ssh; |
4540 | |
4541 | remoteid = ssh_pkt_getuint32(pktin); |
4542 | ssh_pkt_getstring(pktin, &host, &hostsize); |
4543 | port = ssh_pkt_getuint32(pktin); |
4544 | |
4545 | if (hostsize >= lenof(pf.dhost)) |
4546 | hostsize = lenof(pf.dhost)-1; |
4547 | memcpy(pf.dhost, host, hostsize); |
4548 | pf.dhost[hostsize] = '\0'; |
4549 | pf.dport = port; |
05581745 |
4550 | pfp = find234(ssh->rportfwds, &pf, NULL); |
51df0ab5 |
4551 | |
05581745 |
4552 | if (pfp == NULL) { |
fb983202 |
4553 | logeventf(ssh, "Rejected remote port open request for %s:%d", |
4554 | pf.dhost, port); |
51df0ab5 |
4555 | send_packet(ssh, SSH1_MSG_CHANNEL_OPEN_FAILURE, |
4556 | PKT_INT, remoteid, PKT_END); |
4557 | } else { |
fb983202 |
4558 | logeventf(ssh, "Received remote port open request for %s:%d", |
4559 | pf.dhost, port); |
51df0ab5 |
4560 | e = pfd_newconnect(&c->u.pfd.s, pf.dhost, port, |
05581745 |
4561 | c, &ssh->cfg, pfp->pfrec->addressfamily); |
51df0ab5 |
4562 | if (e != NULL) { |
fb983202 |
4563 | logeventf(ssh, "Port open failed: %s", e); |
51df0ab5 |
4564 | sfree(c); |
4565 | send_packet(ssh, SSH1_MSG_CHANNEL_OPEN_FAILURE, |
4566 | PKT_INT, remoteid, PKT_END); |
4567 | } else { |
4568 | c->remoteid = remoteid; |
64d6ff88 |
4569 | c->halfopen = FALSE; |
51df0ab5 |
4570 | c->localid = alloc_channel_id(ssh); |
4571 | c->closes = 0; |
4572 | c->v.v1.throttling = 0; |
4573 | c->type = CHAN_SOCKDATA; /* identify channel type */ |
4574 | add234(ssh->channels, c); |
4575 | send_packet(ssh, SSH1_MSG_CHANNEL_OPEN_CONFIRMATION, |
4576 | PKT_INT, c->remoteid, PKT_INT, |
4577 | c->localid, PKT_END); |
4578 | logevent("Forwarded port opened successfully"); |
4579 | } |
4580 | } |
4581 | } |
4582 | |
4583 | static void ssh1_msg_channel_open_confirmation(Ssh ssh, struct Packet *pktin) |
4584 | { |
4585 | unsigned int remoteid = ssh_pkt_getuint32(pktin); |
4586 | unsigned int localid = ssh_pkt_getuint32(pktin); |
4587 | struct ssh_channel *c; |
4588 | |
4589 | c = find234(ssh->channels, &remoteid, ssh_channelfind); |
4590 | if (c && c->type == CHAN_SOCKDATA_DORMANT) { |
4591 | c->remoteid = localid; |
64d6ff88 |
4592 | c->halfopen = FALSE; |
51df0ab5 |
4593 | c->type = CHAN_SOCKDATA; |
4594 | c->v.v1.throttling = 0; |
4595 | pfd_confirm(c->u.pfd.s); |
4596 | } |
4597 | |
4598 | if (c && c->closes) { |
4599 | /* |
4600 | * We have a pending close on this channel, |
4601 | * which we decided on before the server acked |
4602 | * the channel open. So now we know the |
4603 | * remoteid, we can close it again. |
4604 | */ |
4605 | send_packet(ssh, SSH1_MSG_CHANNEL_CLOSE, |
4606 | PKT_INT, c->remoteid, PKT_END); |
4607 | } |
4608 | } |
4609 | |
4610 | static void ssh1_msg_channel_open_failure(Ssh ssh, struct Packet *pktin) |
4611 | { |
4612 | unsigned int remoteid = ssh_pkt_getuint32(pktin); |
4613 | struct ssh_channel *c; |
4614 | |
4615 | c = find234(ssh->channels, &remoteid, ssh_channelfind); |
4616 | if (c && c->type == CHAN_SOCKDATA_DORMANT) { |
4617 | logevent("Forwarded connection refused by server"); |
4618 | pfd_close(c->u.pfd.s); |
4619 | del234(ssh->channels, c); |
4620 | sfree(c); |
4621 | } |
4622 | } |
4623 | |
4624 | static void ssh1_msg_channel_close(Ssh ssh, struct Packet *pktin) |
4625 | { |
4626 | /* Remote side closes a channel. */ |
4627 | unsigned i = ssh_pkt_getuint32(pktin); |
4628 | struct ssh_channel *c; |
4629 | c = find234(ssh->channels, &i, ssh_channelfind); |
64d6ff88 |
4630 | if (c && !c->halfopen) { |
51df0ab5 |
4631 | int closetype; |
4632 | closetype = |
4633 | (pktin->type == SSH1_MSG_CHANNEL_CLOSE ? 1 : 2); |
4634 | |
4635 | if ((c->closes == 0) && (c->type == CHAN_X11)) { |
4636 | logevent("Forwarded X11 connection terminated"); |
4637 | assert(c->u.x11.s != NULL); |
4638 | x11_close(c->u.x11.s); |
4639 | c->u.x11.s = NULL; |
4640 | } |
4641 | if ((c->closes == 0) && (c->type == CHAN_SOCKDATA)) { |
4642 | logevent("Forwarded port closed"); |
4643 | assert(c->u.pfd.s != NULL); |
4644 | pfd_close(c->u.pfd.s); |
4645 | c->u.pfd.s = NULL; |
4646 | } |
4647 | |
4648 | c->closes |= (closetype << 2); /* seen this message */ |
4649 | if (!(c->closes & closetype)) { |
4650 | send_packet(ssh, pktin->type, PKT_INT, c->remoteid, |
4651 | PKT_END); |
4652 | c->closes |= closetype; /* sent it too */ |
4653 | } |
4654 | |
4655 | if (c->closes == 15) { |
4656 | del234(ssh->channels, c); |
4657 | sfree(c); |
4658 | } |
4659 | } else { |
4660 | bombout(("Received CHANNEL_CLOSE%s for %s channel %d\n", |
4661 | pktin->type == SSH1_MSG_CHANNEL_CLOSE ? "" : |
4662 | "_CONFIRMATION", c ? "half-open" : "nonexistent", |
4663 | i)); |
4664 | } |
4665 | } |
4666 | |
4667 | static void ssh1_msg_channel_data(Ssh ssh, struct Packet *pktin) |
4668 | { |
4669 | /* Data sent down one of our channels. */ |
4670 | int i = ssh_pkt_getuint32(pktin); |
4671 | char *p; |
6d44acc9 |
4672 | int len; |
51df0ab5 |
4673 | struct ssh_channel *c; |
4674 | |
4675 | ssh_pkt_getstring(pktin, &p, &len); |
4676 | |
4677 | c = find234(ssh->channels, &i, ssh_channelfind); |
4678 | if (c) { |
4679 | int bufsize = 0; |
4680 | switch (c->type) { |
4681 | case CHAN_X11: |
4682 | bufsize = x11_send(c->u.x11.s, p, len); |
4683 | break; |
4684 | case CHAN_SOCKDATA: |
4685 | bufsize = pfd_send(c->u.pfd.s, p, len); |
4686 | break; |
4687 | case CHAN_AGENT: |
4688 | /* Data for an agent message. Buffer it. */ |
4689 | while (len > 0) { |
4690 | if (c->u.a.lensofar < 4) { |
62ddb51e |
4691 | unsigned int l = min(4 - c->u.a.lensofar, (unsigned)len); |
51df0ab5 |
4692 | memcpy(c->u.a.msglen + c->u.a.lensofar, p, |
4693 | l); |
4694 | p += l; |
4695 | len -= l; |
4696 | c->u.a.lensofar += l; |
4697 | } |
4698 | if (c->u.a.lensofar == 4) { |
4699 | c->u.a.totallen = |
4700 | 4 + GET_32BIT(c->u.a.msglen); |
4701 | c->u.a.message = snewn(c->u.a.totallen, |
4702 | unsigned char); |
4703 | memcpy(c->u.a.message, c->u.a.msglen, 4); |
4704 | } |
4705 | if (c->u.a.lensofar >= 4 && len > 0) { |
aa63ab7e |
4706 | unsigned int l = |
51df0ab5 |
4707 | min(c->u.a.totallen - c->u.a.lensofar, |
62ddb51e |
4708 | (unsigned)len); |
51df0ab5 |
4709 | memcpy(c->u.a.message + c->u.a.lensofar, p, |
4710 | l); |
4711 | p += l; |
4712 | len -= l; |
4713 | c->u.a.lensofar += l; |
4714 | } |
4715 | if (c->u.a.lensofar == c->u.a.totallen) { |
4716 | void *reply; |
4717 | int replylen; |
4718 | if (agent_query(c->u.a.message, |
4719 | c->u.a.totallen, |
4720 | &reply, &replylen, |
4721 | ssh_agentf_callback, c)) |
4722 | ssh_agentf_callback(c, reply, replylen); |
4723 | sfree(c->u.a.message); |
4724 | c->u.a.lensofar = 0; |
4725 | } |
4726 | } |
4727 | bufsize = 0; /* agent channels never back up */ |
4728 | break; |
4729 | } |
4730 | if (!c->v.v1.throttling && bufsize > SSH1_BUFFER_LIMIT) { |
4731 | c->v.v1.throttling = 1; |
4732 | ssh1_throttle(ssh, +1); |
4733 | } |
4734 | } |
4735 | } |
4736 | |
4737 | static void ssh1_smsg_exit_status(Ssh ssh, struct Packet *pktin) |
4738 | { |
51df0ab5 |
4739 | ssh->exitcode = ssh_pkt_getuint32(pktin); |
fb983202 |
4740 | logeventf(ssh, "Server sent command exit status %d", ssh->exitcode); |
51df0ab5 |
4741 | send_packet(ssh, SSH1_CMSG_EXIT_CONFIRMATION, PKT_END); |
4742 | /* |
4743 | * In case `helpful' firewalls or proxies tack |
4744 | * extra human-readable text on the end of the |
4745 | * session which we might mistake for another |
4746 | * encrypted packet, we close the session once |
4747 | * we've sent EXIT_CONFIRMATION. |
4748 | */ |
9e296bfa |
4749 | ssh_disconnect(ssh, NULL, NULL, 0, TRUE); |
51df0ab5 |
4750 | } |
4751 | |
c6ccd5c2 |
4752 | /* Helper function to deal with sending tty modes for REQUEST_PTY */ |
4753 | static void ssh1_send_ttymode(void *data, char *mode, char *val) |
4754 | { |
4755 | struct Packet *pktout = (struct Packet *)data; |
4756 | int i = 0; |
4757 | unsigned int arg = 0; |
4758 | while (strcmp(mode, ssh_ttymodes[i].mode) != 0) i++; |
4759 | if (i == lenof(ssh_ttymodes)) return; |
4760 | switch (ssh_ttymodes[i].type) { |
4761 | case TTY_OP_CHAR: |
4762 | arg = ssh_tty_parse_specchar(val); |
4763 | break; |
4764 | case TTY_OP_BOOL: |
4765 | arg = ssh_tty_parse_boolean(val); |
4766 | break; |
4767 | } |
4768 | ssh2_pkt_addbyte(pktout, ssh_ttymodes[i].opcode); |
4769 | ssh2_pkt_addbyte(pktout, arg); |
4770 | } |
4771 | |
4772 | |
b09eaa88 |
4773 | static void do_ssh1_connection(Ssh ssh, unsigned char *in, int inlen, |
4774 | struct Packet *pktin) |
32874aea |
4775 | { |
b09eaa88 |
4776 | crBegin(ssh->do_ssh1_connection_crstate); |
fb09bf1c |
4777 | |
51df0ab5 |
4778 | ssh->packet_dispatch[SSH1_SMSG_STDOUT_DATA] = |
4779 | ssh->packet_dispatch[SSH1_SMSG_STDERR_DATA] = |
4780 | ssh1_smsg_stdout_stderr_data; |
4781 | |
4782 | ssh->packet_dispatch[SSH1_MSG_CHANNEL_OPEN_CONFIRMATION] = |
4783 | ssh1_msg_channel_open_confirmation; |
4784 | ssh->packet_dispatch[SSH1_MSG_CHANNEL_OPEN_FAILURE] = |
4785 | ssh1_msg_channel_open_failure; |
4786 | ssh->packet_dispatch[SSH1_MSG_CHANNEL_CLOSE] = |
4787 | ssh->packet_dispatch[SSH1_MSG_CHANNEL_CLOSE_CONFIRMATION] = |
4788 | ssh1_msg_channel_close; |
4789 | ssh->packet_dispatch[SSH1_MSG_CHANNEL_DATA] = ssh1_msg_channel_data; |
4790 | ssh->packet_dispatch[SSH1_SMSG_EXIT_STATUS] = ssh1_smsg_exit_status; |
4791 | |
86916870 |
4792 | if (ssh->cfg.agentfwd && agent_exists()) { |
32874aea |
4793 | logevent("Requesting agent forwarding"); |
51470298 |
4794 | send_packet(ssh, SSH1_CMSG_AGENT_REQUEST_FORWARDING, PKT_END); |
32874aea |
4795 | do { |
4796 | crReturnV; |
ff3187f6 |
4797 | } while (!pktin); |
4798 | if (pktin->type != SSH1_SMSG_SUCCESS |
4799 | && pktin->type != SSH1_SMSG_FAILURE) { |
6b5cf8b4 |
4800 | bombout(("Protocol confusion")); |
7ffdbc1a |
4801 | crStopV; |
ff3187f6 |
4802 | } else if (pktin->type == SSH1_SMSG_FAILURE) { |
32874aea |
4803 | logevent("Agent forwarding refused"); |
4804 | } else { |
4805 | logevent("Agent forwarding enabled"); |
51470298 |
4806 | ssh->agentfwd_enabled = TRUE; |
51df0ab5 |
4807 | ssh->packet_dispatch[SSH1_SMSG_AGENT_OPEN] = ssh1_smsg_agent_open; |
db7d555c |
4808 | } |
dacbd0e8 |
4809 | } |
4810 | |
86916870 |
4811 | if (ssh->cfg.x11_forward) { |
32874aea |
4812 | char proto[20], data[64]; |
4813 | logevent("Requesting X11 forwarding"); |
302121de |
4814 | ssh->x11auth = x11_invent_auth(proto, sizeof(proto), |
86916870 |
4815 | data, sizeof(data), ssh->cfg.x11_auth); |
4816 | x11_get_real_auth(ssh->x11auth, ssh->cfg.x11_display); |
f68353be |
4817 | /* |
4818 | * Note that while we blank the X authentication data here, we don't |
4819 | * take any special action to blank the start of an X11 channel, |
4820 | * so using MIT-MAGIC-COOKIE-1 and actually opening an X connection |
4821 | * without having session blanking enabled is likely to leak your |
4822 | * cookie into the log. |
4823 | */ |
51470298 |
4824 | if (ssh->v1_local_protoflags & SSH1_PROTOFLAG_SCREEN_NUMBER) { |
4825 | send_packet(ssh, SSH1_CMSG_X11_REQUEST_FORWARDING, |
f68353be |
4826 | PKT_STR, proto, |
4827 | PKTT_PASSWORD, PKT_STR, data, PKTT_OTHER, |
86916870 |
4828 | PKT_INT, x11_get_screen_number(ssh->cfg.x11_display), |
421d6835 |
4829 | PKT_END); |
32874aea |
4830 | } else { |
51470298 |
4831 | send_packet(ssh, SSH1_CMSG_X11_REQUEST_FORWARDING, |
f68353be |
4832 | PKT_STR, proto, |
4833 | PKTT_PASSWORD, PKT_STR, data, PKTT_OTHER, PKT_END); |
32874aea |
4834 | } |
4835 | do { |
4836 | crReturnV; |
ff3187f6 |
4837 | } while (!pktin); |
4838 | if (pktin->type != SSH1_SMSG_SUCCESS |
4839 | && pktin->type != SSH1_SMSG_FAILURE) { |
6b5cf8b4 |
4840 | bombout(("Protocol confusion")); |
7ffdbc1a |
4841 | crStopV; |
ff3187f6 |
4842 | } else if (pktin->type == SSH1_SMSG_FAILURE) { |
32874aea |
4843 | logevent("X11 forwarding refused"); |
4844 | } else { |
4845 | logevent("X11 forwarding enabled"); |
51470298 |
4846 | ssh->X11_fwd_enabled = TRUE; |
51df0ab5 |
4847 | ssh->packet_dispatch[SSH1_SMSG_X11_OPEN] = ssh1_smsg_x11_open; |
9c964e85 |
4848 | } |
4849 | } |
4850 | |
06fadff5 |
4851 | ssh_setup_portfwd(ssh, &ssh->cfg); |
4852 | ssh->packet_dispatch[SSH1_MSG_PORT_OPEN] = ssh1_msg_port_open; |
d74d141c |
4853 | |
86916870 |
4854 | if (!ssh->cfg.nopty) { |
c6ccd5c2 |
4855 | struct Packet *pkt; |
a5dd8467 |
4856 | /* Unpick the terminal-speed string. */ |
4857 | /* XXX perhaps we should allow no speeds to be sent. */ |
db219738 |
4858 | ssh->ospeed = 38400; ssh->ispeed = 38400; /* last-resort defaults */ |
4859 | sscanf(ssh->cfg.termspeed, "%d,%d", &ssh->ospeed, &ssh->ispeed); |
a5dd8467 |
4860 | /* Send the pty request. */ |
c6ccd5c2 |
4861 | pkt = ssh1_pkt_init(SSH1_CMSG_REQUEST_PTY); |
4862 | ssh_pkt_addstring(pkt, ssh->cfg.termtype); |
4863 | ssh_pkt_adduint32(pkt, ssh->term_height); |
4864 | ssh_pkt_adduint32(pkt, ssh->term_width); |
4865 | ssh_pkt_adduint32(pkt, 0); /* width in pixels */ |
4866 | ssh_pkt_adduint32(pkt, 0); /* height in pixels */ |
4867 | parse_ttymodes(ssh, ssh->cfg.ttymodes, |
4868 | ssh1_send_ttymode, (void *)pkt); |
4869 | ssh_pkt_addbyte(pkt, SSH1_TTY_OP_ISPEED); |
4870 | ssh_pkt_adduint32(pkt, ssh->ispeed); |
4871 | ssh_pkt_addbyte(pkt, SSH1_TTY_OP_OSPEED); |
4872 | ssh_pkt_adduint32(pkt, ssh->ospeed); |
4873 | ssh_pkt_addbyte(pkt, SSH_TTY_OP_END); |
4874 | s_wrpkt(ssh, pkt); |
51470298 |
4875 | ssh->state = SSH_STATE_INTERMED; |
32874aea |
4876 | do { |
4877 | crReturnV; |
ff3187f6 |
4878 | } while (!pktin); |
4879 | if (pktin->type != SSH1_SMSG_SUCCESS |
4880 | && pktin->type != SSH1_SMSG_FAILURE) { |
6b5cf8b4 |
4881 | bombout(("Protocol confusion")); |
7ffdbc1a |
4882 | crStopV; |
ff3187f6 |
4883 | } else if (pktin->type == SSH1_SMSG_FAILURE) { |
51470298 |
4884 | c_write_str(ssh, "Server refused to allocate pty\r\n"); |
4885 | ssh->editing = ssh->echoing = 1; |
32874aea |
4886 | } |
a5dd8467 |
4887 | logeventf(ssh, "Allocated pty (ospeed %dbps, ispeed %dbps)", |
db219738 |
4888 | ssh->ospeed, ssh->ispeed); |
0965bee0 |
4889 | } else { |
51470298 |
4890 | ssh->editing = ssh->echoing = 1; |
374330e2 |
4891 | } |
4892 | |
86916870 |
4893 | if (ssh->cfg.compression) { |
51470298 |
4894 | send_packet(ssh, SSH1_CMSG_REQUEST_COMPRESSION, PKT_INT, 6, PKT_END); |
32874aea |
4895 | do { |
4896 | crReturnV; |
ff3187f6 |
4897 | } while (!pktin); |
4898 | if (pktin->type != SSH1_SMSG_SUCCESS |
4899 | && pktin->type != SSH1_SMSG_FAILURE) { |
6b5cf8b4 |
4900 | bombout(("Protocol confusion")); |
7ffdbc1a |
4901 | crStopV; |
ff3187f6 |
4902 | } else if (pktin->type == SSH1_SMSG_FAILURE) { |
51470298 |
4903 | c_write_str(ssh, "Server refused to compress\r\n"); |
32874aea |
4904 | } |
4ba9b64b |
4905 | logevent("Started compression"); |
51470298 |
4906 | ssh->v1_compressing = TRUE; |
5366aed8 |
4907 | ssh->cs_comp_ctx = zlib_compress_init(); |
4908 | logevent("Initialised zlib (RFC1950) compression"); |
4909 | ssh->sc_comp_ctx = zlib_decompress_init(); |
4910 | logevent("Initialised zlib (RFC1950) decompression"); |
4ba9b64b |
4911 | } |
4912 | |
fd5e5847 |
4913 | /* |
4914 | * Start the shell or command. |
4915 | * |
2e85c969 |
4916 | * Special case: if the first-choice command is an SSH-2 |
fd5e5847 |
4917 | * subsystem (hence not usable here) and the second choice |
4918 | * exists, we fall straight back to that. |
4919 | */ |
4920 | { |
86916870 |
4921 | char *cmd = ssh->cfg.remote_cmd_ptr; |
04c52f10 |
4922 | |
4923 | if (!cmd) cmd = ssh->cfg.remote_cmd; |
fd5e5847 |
4924 | |
86916870 |
4925 | if (ssh->cfg.ssh_subsys && ssh->cfg.remote_cmd_ptr2) { |
4926 | cmd = ssh->cfg.remote_cmd_ptr2; |
51470298 |
4927 | ssh->fallback_cmd = TRUE; |
fd5e5847 |
4928 | } |
4929 | if (*cmd) |
51470298 |
4930 | send_packet(ssh, SSH1_CMSG_EXEC_CMD, PKT_STR, cmd, PKT_END); |
fd5e5847 |
4931 | else |
51470298 |
4932 | send_packet(ssh, SSH1_CMSG_EXEC_SHELL, PKT_END); |
fd5e5847 |
4933 | logevent("Started session"); |
4934 | } |
374330e2 |
4935 | |
51470298 |
4936 | ssh->state = SSH_STATE_SESSION; |
4937 | if (ssh->size_needed) |
4938 | ssh_size(ssh, ssh->term_width, ssh->term_height); |
4939 | if (ssh->eof_needed) |
4940 | ssh_special(ssh, TS_EOF); |
374330e2 |
4941 | |
b9d7bcad |
4942 | if (ssh->ldisc) |
4943 | ldisc_send(ssh->ldisc, NULL, 0, 0);/* cause ldisc to notice changes */ |
51470298 |
4944 | ssh->send_ok = 1; |
4945 | ssh->channels = newtree234(ssh_channelcmp); |
374330e2 |
4946 | while (1) { |
d74d141c |
4947 | |
51df0ab5 |
4948 | /* |
4949 | * By this point, most incoming packets are already being |
4950 | * handled by the dispatch table, and we need only pay |
4951 | * attention to the unusual ones. |
4952 | */ |
0357890f |
4953 | |
51df0ab5 |
4954 | crReturnV; |
4955 | if (pktin) { |
4956 | if (pktin->type == SSH1_SMSG_SUCCESS) { |
972a41c8 |
4957 | /* may be from EXEC_SHELL on some servers */ |
ff3187f6 |
4958 | } else if (pktin->type == SSH1_SMSG_FAILURE) { |
972a41c8 |
4959 | /* may be from EXEC_SHELL on some servers |
374330e2 |
4960 | * if no pty is available or in other odd cases. Ignore */ |
374330e2 |
4961 | } else { |
ff3187f6 |
4962 | bombout(("Strange packet received: type %d", pktin->type)); |
7ffdbc1a |
4963 | crStopV; |
374330e2 |
4964 | } |
4965 | } else { |
8df7a775 |
4966 | while (inlen > 0) { |
4967 | int len = min(inlen, 512); |
9a10ecf4 |
4968 | send_packet(ssh, SSH1_CMSG_STDIN_DATA, PKTT_DATA, |
4969 | PKT_INT, len, PKT_DATA, in, len, |
4970 | PKTT_OTHER, PKT_END); |
8df7a775 |
4971 | in += len; |
4972 | inlen -= len; |
4973 | } |
374330e2 |
4974 | } |
4975 | } |
4976 | |
4977 | crFinishV; |
4978 | } |
4979 | |
4980 | /* |
2e85c969 |
4981 | * Handle the top-level SSH-2 protocol. |
b09eaa88 |
4982 | */ |
4983 | static void ssh1_msg_debug(Ssh ssh, struct Packet *pktin) |
4984 | { |
fb983202 |
4985 | char *msg; |
b09eaa88 |
4986 | int msglen; |
4987 | |
4988 | ssh_pkt_getstring(pktin, &msg, &msglen); |
fb983202 |
4989 | logeventf(ssh, "Remote debug message: %.*s", msglen, msg); |
b09eaa88 |
4990 | } |
4991 | |
4992 | static void ssh1_msg_disconnect(Ssh ssh, struct Packet *pktin) |
4993 | { |
4994 | /* log reason code in disconnect message */ |
4995 | char *msg; |
4996 | int msglen; |
4997 | |
4998 | ssh_pkt_getstring(pktin, &msg, &msglen); |
4999 | bombout(("Server sent disconnect message:\n\"%.*s\"", msglen, msg)); |
5000 | } |
5001 | |
409bfa77 |
5002 | static void ssh_msg_ignore(Ssh ssh, struct Packet *pktin) |
b09eaa88 |
5003 | { |
5004 | /* Do nothing, because we're ignoring it! Duhh. */ |
5005 | } |
5006 | |
5007 | static void ssh1_protocol_setup(Ssh ssh) |
5008 | { |
5009 | int i; |
5010 | |
5011 | /* |
5012 | * Most messages are handled by the coroutines. |
5013 | */ |
5014 | for (i = 0; i < 256; i++) |
5015 | ssh->packet_dispatch[i] = NULL; |
5016 | |
5017 | /* |
5018 | * These special message types we install handlers for. |
5019 | */ |
5020 | ssh->packet_dispatch[SSH1_MSG_DISCONNECT] = ssh1_msg_disconnect; |
5021 | ssh->packet_dispatch[SSH1_MSG_IGNORE] = ssh_msg_ignore; |
5022 | ssh->packet_dispatch[SSH1_MSG_DEBUG] = ssh1_msg_debug; |
5023 | } |
5024 | |
1c1a7262 |
5025 | static void ssh1_protocol(Ssh ssh, void *vin, int inlen, |
b09eaa88 |
5026 | struct Packet *pktin) |
5027 | { |
1c1a7262 |
5028 | unsigned char *in=(unsigned char*)vin; |
b09eaa88 |
5029 | if (ssh->state == SSH_STATE_CLOSED) |
5030 | return; |
5031 | |
5032 | if (pktin && ssh->packet_dispatch[pktin->type]) { |
5033 | ssh->packet_dispatch[pktin->type](ssh, pktin); |
5034 | return; |
5035 | } |
5036 | |
5037 | if (!ssh->protocol_initial_phase_done) { |
5038 | if (do_ssh1_login(ssh, in, inlen, pktin)) |
5039 | ssh->protocol_initial_phase_done = TRUE; |
5040 | else |
5041 | return; |
5042 | } |
5043 | |
5044 | do_ssh1_connection(ssh, in, inlen, pktin); |
5045 | } |
5046 | |
5047 | /* |
e5574168 |
5048 | * Utility routine for decoding comma-separated strings in KEXINIT. |
5049 | */ |
32874aea |
5050 | static int in_commasep_string(char *needle, char *haystack, int haylen) |
5051 | { |
57356d63 |
5052 | int needlen; |
5053 | if (!needle || !haystack) /* protect against null pointers */ |
5054 | return 0; |
5055 | needlen = strlen(needle); |
e5574168 |
5056 | while (1) { |
32874aea |
5057 | /* |
5058 | * Is it at the start of the string? |
5059 | */ |
5060 | if (haylen >= needlen && /* haystack is long enough */ |
5061 | !memcmp(needle, haystack, needlen) && /* initial match */ |
5062 | (haylen == needlen || haystack[needlen] == ',') |
5063 | /* either , or EOS follows */ |
5064 | ) |
5065 | return 1; |
5066 | /* |
5067 | * If not, search for the next comma and resume after that. |
5068 | * If no comma found, terminate. |
5069 | */ |
5070 | while (haylen > 0 && *haystack != ',') |
5071 | haylen--, haystack++; |
5072 | if (haylen == 0) |
5073 | return 0; |
5074 | haylen--, haystack++; /* skip over comma itself */ |
e5574168 |
5075 | } |
5076 | } |
5077 | |
5078 | /* |
b59743d5 |
5079 | * Similar routine for checking whether we have the first string in a list. |
5080 | */ |
5081 | static int first_in_commasep_string(char *needle, char *haystack, int haylen) |
5082 | { |
5083 | int needlen; |
5084 | if (!needle || !haystack) /* protect against null pointers */ |
5085 | return 0; |
5086 | needlen = strlen(needle); |
5087 | /* |
5088 | * Is it at the start of the string? |
5089 | */ |
5090 | if (haylen >= needlen && /* haystack is long enough */ |
5091 | !memcmp(needle, haystack, needlen) && /* initial match */ |
5092 | (haylen == needlen || haystack[needlen] == ',') |
5093 | /* either , or EOS follows */ |
5094 | ) |
5095 | return 1; |
5096 | return 0; |
5097 | } |
5098 | |
5099 | |
5100 | /* |
2e85c969 |
5101 | * SSH-2 key creation method. |
754c0df9 |
5102 | * (Currently assumes 2 lots of any hash are sufficient to generate |
5103 | * keys/IVs for any cipher/MAC. SSH2_MKKEY_ITERS documents this assumption.) |
d39f364a |
5104 | */ |
754c0df9 |
5105 | #define SSH2_MKKEY_ITERS (2) |
b672f405 |
5106 | static void ssh2_mkkey(Ssh ssh, Bignum K, unsigned char *H, char chr, |
d8baa528 |
5107 | unsigned char *keyspace) |
32874aea |
5108 | { |
b672f405 |
5109 | const struct ssh_hash *h = ssh->kex->hash; |
5110 | void *s; |
5111 | /* First hlen bytes. */ |
5112 | s = h->init(); |
51470298 |
5113 | if (!(ssh->remote_bugs & BUG_SSH2_DERIVEKEY)) |
b672f405 |
5114 | hash_mpint(h, s, K); |
5115 | h->bytes(s, H, h->hlen); |
5116 | h->bytes(s, &chr, 1); |
5117 | h->bytes(s, ssh->v2_session_id, ssh->v2_session_id_len); |
5118 | h->final(s, keyspace); |
5119 | /* Next hlen bytes. */ |
5120 | s = h->init(); |
51470298 |
5121 | if (!(ssh->remote_bugs & BUG_SSH2_DERIVEKEY)) |
b672f405 |
5122 | hash_mpint(h, s, K); |
5123 | h->bytes(s, H, h->hlen); |
5124 | h->bytes(s, keyspace, h->hlen); |
5125 | h->final(s, keyspace + h->hlen); |
d39f364a |
5126 | } |
5127 | |
5128 | /* |
2e85c969 |
5129 | * Handle the SSH-2 transport layer. |
e5574168 |
5130 | */ |
1c1a7262 |
5131 | static int do_ssh2_transport(Ssh ssh, void *vin, int inlen, |
ff3187f6 |
5132 | struct Packet *pktin) |
e5574168 |
5133 | { |
1c1a7262 |
5134 | unsigned char *in = (unsigned char *)vin; |
51470298 |
5135 | struct do_ssh2_transport_state { |
4763c1c2 |
5136 | int nbits, pbits, warn_kex, warn_cscipher, warn_sccipher; |
51470298 |
5137 | Bignum p, g, e, f, K; |
3dc9a6a7 |
5138 | void *our_kexinit; |
5139 | int our_kexinitlen; |
51470298 |
5140 | int kex_init_value, kex_reply_value; |
5141 | const struct ssh_mac **maclist; |
5142 | int nmacs; |
5143 | const struct ssh2_cipher *cscipher_tobe; |
5144 | const struct ssh2_cipher *sccipher_tobe; |
5145 | const struct ssh_mac *csmac_tobe; |
5146 | const struct ssh_mac *scmac_tobe; |
5147 | const struct ssh_compress *cscomp_tobe; |
5148 | const struct ssh_compress *sccomp_tobe; |
fae1a71b |
5149 | char *hostkeydata, *sigdata, *rsakeydata, *keystr, *fingerprint; |
5150 | int hostkeylen, siglen, rsakeylen; |
51470298 |
5151 | void *hkey; /* actual host key */ |
fae1a71b |
5152 | void *rsakey; /* for RSA kex */ |
754c0df9 |
5153 | unsigned char exchange_hash[SSH2_KEX_MAX_HASH_LEN]; |
83e7d008 |
5154 | int n_preferred_kex; |
34557659 |
5155 | const struct ssh_kexes *preferred_kex[KEX_MAX]; |
51470298 |
5156 | int n_preferred_ciphers; |
5157 | const struct ssh2_ciphers *preferred_ciphers[CIPHER_MAX]; |
5158 | const struct ssh_compress *preferred_comp; |
e13bba36 |
5159 | int got_session_id, activated_authconn; |
ff3187f6 |
5160 | struct Packet *pktout; |
3d9449a1 |
5161 | int dlgret; |
5162 | int guessok; |
4763c1c2 |
5163 | int ignorepkt; |
51470298 |
5164 | }; |
5165 | crState(do_ssh2_transport_state); |
5166 | |
5167 | crBegin(ssh->do_ssh2_transport_crstate); |
5168 | |
5169 | s->cscipher_tobe = s->sccipher_tobe = NULL; |
5170 | s->csmac_tobe = s->scmac_tobe = NULL; |
5171 | s->cscomp_tobe = s->sccomp_tobe = NULL; |
5172 | |
e13bba36 |
5173 | s->got_session_id = s->activated_authconn = FALSE; |
e5574168 |
5174 | |
e13bba36 |
5175 | /* |
5176 | * Be prepared to work around the buggy MAC problem. |
5177 | */ |
5178 | if (ssh->remote_bugs & BUG_SSH2_HMAC) |
5179 | s->maclist = buggymacs, s->nmacs = lenof(buggymacs); |
5180 | else |
5181 | s->maclist = macs, s->nmacs = lenof(macs); |
5182 | |
5183 | begin_key_exchange: |
149d2abc |
5184 | ssh->pkt_ctx &= ~SSH2_PKTCTX_KEX_MASK; |
51470298 |
5185 | { |
e13bba36 |
5186 | int i, j, commalist_started; |
5187 | |
51470298 |
5188 | /* |
83e7d008 |
5189 | * Set up the preferred key exchange. (NULL => warn below here) |
5190 | */ |
5191 | s->n_preferred_kex = 0; |
5192 | for (i = 0; i < KEX_MAX; i++) { |
5193 | switch (ssh->cfg.ssh_kexlist[i]) { |
5194 | case KEX_DHGEX: |
5195 | s->preferred_kex[s->n_preferred_kex++] = |
5196 | &ssh_diffiehellman_gex; |
5197 | break; |
5198 | case KEX_DHGROUP14: |
5199 | s->preferred_kex[s->n_preferred_kex++] = |
5200 | &ssh_diffiehellman_group14; |
5201 | break; |
5202 | case KEX_DHGROUP1: |
5203 | s->preferred_kex[s->n_preferred_kex++] = |
5204 | &ssh_diffiehellman_group1; |
5205 | break; |
fae1a71b |
5206 | case KEX_RSA: |
5207 | s->preferred_kex[s->n_preferred_kex++] = |
5208 | &ssh_rsa_kex; |
5209 | break; |
754c0df9 |
5210 | case KEX_WARN: |
83e7d008 |
5211 | /* Flag for later. Don't bother if it's the last in |
5212 | * the list. */ |
5213 | if (i < KEX_MAX - 1) { |
5214 | s->preferred_kex[s->n_preferred_kex++] = NULL; |
5215 | } |
5216 | break; |
5217 | } |
5218 | } |
83e7d008 |
5219 | |
83e7d008 |
5220 | /* |
51470298 |
5221 | * Set up the preferred ciphers. (NULL => warn below here) |
5222 | */ |
5223 | s->n_preferred_ciphers = 0; |
5224 | for (i = 0; i < CIPHER_MAX; i++) { |
86916870 |
5225 | switch (ssh->cfg.ssh_cipherlist[i]) { |
51470298 |
5226 | case CIPHER_BLOWFISH: |
5227 | s->preferred_ciphers[s->n_preferred_ciphers++] = &ssh2_blowfish; |
5228 | break; |
5229 | case CIPHER_DES: |
86916870 |
5230 | if (ssh->cfg.ssh2_des_cbc) { |
51470298 |
5231 | s->preferred_ciphers[s->n_preferred_ciphers++] = &ssh2_des; |
5232 | } |
5233 | break; |
5234 | case CIPHER_3DES: |
5235 | s->preferred_ciphers[s->n_preferred_ciphers++] = &ssh2_3des; |
5236 | break; |
5237 | case CIPHER_AES: |
5238 | s->preferred_ciphers[s->n_preferred_ciphers++] = &ssh2_aes; |
5239 | break; |
a2add208 |
5240 | case CIPHER_ARCFOUR: |
5241 | s->preferred_ciphers[s->n_preferred_ciphers++] = &ssh2_arcfour; |
5242 | break; |
51470298 |
5243 | case CIPHER_WARN: |
5244 | /* Flag for later. Don't bother if it's the last in |
5245 | * the list. */ |
5246 | if (i < CIPHER_MAX - 1) { |
5247 | s->preferred_ciphers[s->n_preferred_ciphers++] = NULL; |
5248 | } |
5249 | break; |
ca20bfcf |
5250 | } |
ca20bfcf |
5251 | } |
7591b9ff |
5252 | |
e13bba36 |
5253 | /* |
5254 | * Set up preferred compression. |
5255 | */ |
5256 | if (ssh->cfg.compression) |
5257 | s->preferred_comp = &ssh_zlib; |
5258 | else |
5259 | s->preferred_comp = &ssh_comp_none; |
51470298 |
5260 | |
5261 | /* |
590f6a5f |
5262 | * Enable queueing of outgoing auth- or connection-layer |
5263 | * packets while we are in the middle of a key exchange. |
5264 | */ |
5265 | ssh->queueing = TRUE; |
5266 | |
5267 | /* |
9442dd57 |
5268 | * Flag that KEX is in progress. |
5269 | */ |
5270 | ssh->kex_in_progress = TRUE; |
5271 | |
5272 | /* |
51470298 |
5273 | * Construct and send our key exchange packet. |
5274 | */ |
ff3187f6 |
5275 | s->pktout = ssh2_pkt_init(SSH2_MSG_KEXINIT); |
51470298 |
5276 | for (i = 0; i < 16; i++) |
ff3187f6 |
5277 | ssh2_pkt_addbyte(s->pktout, (unsigned char) random_byte()); |
51470298 |
5278 | /* List key exchange algorithms. */ |
ff3187f6 |
5279 | ssh2_pkt_addstring_start(s->pktout); |
83e7d008 |
5280 | commalist_started = 0; |
5281 | for (i = 0; i < s->n_preferred_kex; i++) { |
34557659 |
5282 | const struct ssh_kexes *k = s->preferred_kex[i]; |
83e7d008 |
5283 | if (!k) continue; /* warning flag */ |
34557659 |
5284 | for (j = 0; j < k->nkexes; j++) { |
5285 | if (commalist_started) |
5286 | ssh2_pkt_addstring_str(s->pktout, ","); |
5287 | ssh2_pkt_addstring_str(s->pktout, k->list[j]->name); |
5288 | commalist_started = 1; |
5289 | } |
32874aea |
5290 | } |
51470298 |
5291 | /* List server host key algorithms. */ |
ff3187f6 |
5292 | ssh2_pkt_addstring_start(s->pktout); |
51470298 |
5293 | for (i = 0; i < lenof(hostkey_algs); i++) { |
ff3187f6 |
5294 | ssh2_pkt_addstring_str(s->pktout, hostkey_algs[i]->name); |
51470298 |
5295 | if (i < lenof(hostkey_algs) - 1) |
ff3187f6 |
5296 | ssh2_pkt_addstring_str(s->pktout, ","); |
32874aea |
5297 | } |
51470298 |
5298 | /* List client->server encryption algorithms. */ |
ff3187f6 |
5299 | ssh2_pkt_addstring_start(s->pktout); |
83e7d008 |
5300 | commalist_started = 0; |
51470298 |
5301 | for (i = 0; i < s->n_preferred_ciphers; i++) { |
5302 | const struct ssh2_ciphers *c = s->preferred_ciphers[i]; |
5303 | if (!c) continue; /* warning flag */ |
5304 | for (j = 0; j < c->nciphers; j++) { |
83e7d008 |
5305 | if (commalist_started) |
ff3187f6 |
5306 | ssh2_pkt_addstring_str(s->pktout, ","); |
5307 | ssh2_pkt_addstring_str(s->pktout, c->list[j]->name); |
83e7d008 |
5308 | commalist_started = 1; |
51470298 |
5309 | } |
5310 | } |
5311 | /* List server->client encryption algorithms. */ |
ff3187f6 |
5312 | ssh2_pkt_addstring_start(s->pktout); |
83e7d008 |
5313 | commalist_started = 0; |
51470298 |
5314 | for (i = 0; i < s->n_preferred_ciphers; i++) { |
5315 | const struct ssh2_ciphers *c = s->preferred_ciphers[i]; |
5316 | if (!c) continue; /* warning flag */ |
5317 | for (j = 0; j < c->nciphers; j++) { |
83e7d008 |
5318 | if (commalist_started) |
ff3187f6 |
5319 | ssh2_pkt_addstring_str(s->pktout, ","); |
5320 | ssh2_pkt_addstring_str(s->pktout, c->list[j]->name); |
83e7d008 |
5321 | commalist_started = 1; |
51470298 |
5322 | } |
5323 | } |
5324 | /* List client->server MAC algorithms. */ |
ff3187f6 |
5325 | ssh2_pkt_addstring_start(s->pktout); |
51470298 |
5326 | for (i = 0; i < s->nmacs; i++) { |
ff3187f6 |
5327 | ssh2_pkt_addstring_str(s->pktout, s->maclist[i]->name); |
51470298 |
5328 | if (i < s->nmacs - 1) |
ff3187f6 |
5329 | ssh2_pkt_addstring_str(s->pktout, ","); |
51470298 |
5330 | } |
5331 | /* List server->client MAC algorithms. */ |
ff3187f6 |
5332 | ssh2_pkt_addstring_start(s->pktout); |
51470298 |
5333 | for (i = 0; i < s->nmacs; i++) { |
ff3187f6 |
5334 | ssh2_pkt_addstring_str(s->pktout, s->maclist[i]->name); |
51470298 |
5335 | if (i < s->nmacs - 1) |
ff3187f6 |
5336 | ssh2_pkt_addstring_str(s->pktout, ","); |
51470298 |
5337 | } |
5338 | /* List client->server compression algorithms. */ |
ff3187f6 |
5339 | ssh2_pkt_addstring_start(s->pktout); |
f6e0abe2 |
5340 | assert(lenof(compressions) > 1); |
ff3187f6 |
5341 | ssh2_pkt_addstring_str(s->pktout, s->preferred_comp->name); |
f6e0abe2 |
5342 | for (i = 0; i < lenof(compressions); i++) { |
5343 | const struct ssh_compress *c = compressions[i]; |
5344 | if (c != s->preferred_comp) { |
ff3187f6 |
5345 | ssh2_pkt_addstring_str(s->pktout, ","); |
5346 | ssh2_pkt_addstring_str(s->pktout, c->name); |
f6e0abe2 |
5347 | } |
51470298 |
5348 | } |
5349 | /* List server->client compression algorithms. */ |
ff3187f6 |
5350 | ssh2_pkt_addstring_start(s->pktout); |
f6e0abe2 |
5351 | assert(lenof(compressions) > 1); |
ff3187f6 |
5352 | ssh2_pkt_addstring_str(s->pktout, s->preferred_comp->name); |
f6e0abe2 |
5353 | for (i = 0; i < lenof(compressions); i++) { |
5354 | const struct ssh_compress *c = compressions[i]; |
5355 | if (c != s->preferred_comp) { |
ff3187f6 |
5356 | ssh2_pkt_addstring_str(s->pktout, ","); |
5357 | ssh2_pkt_addstring_str(s->pktout, c->name); |
f6e0abe2 |
5358 | } |
51470298 |
5359 | } |
5360 | /* List client->server languages. Empty list. */ |
ff3187f6 |
5361 | ssh2_pkt_addstring_start(s->pktout); |
51470298 |
5362 | /* List server->client languages. Empty list. */ |
ff3187f6 |
5363 | ssh2_pkt_addstring_start(s->pktout); |
51470298 |
5364 | /* First KEX packet does _not_ follow, because we're not that brave. */ |
ff3187f6 |
5365 | ssh2_pkt_addbool(s->pktout, FALSE); |
51470298 |
5366 | /* Reserved. */ |
ff3187f6 |
5367 | ssh2_pkt_adduint32(s->pktout, 0); |
e5574168 |
5368 | } |
0db56f73 |
5369 | |
3dc9a6a7 |
5370 | s->our_kexinitlen = s->pktout->length - 5; |
5371 | s->our_kexinit = snewn(s->our_kexinitlen, unsigned char); |
5372 | memcpy(s->our_kexinit, s->pktout->data + 5, s->our_kexinitlen); |
0db56f73 |
5373 | |
590f6a5f |
5374 | ssh2_pkt_send_noqueue(ssh, s->pktout); |
e5574168 |
5375 | |
ff3187f6 |
5376 | if (!pktin) |
5377 | crWaitUntil(pktin); |
e5574168 |
5378 | |
5379 | /* |
5380 | * Now examine the other side's KEXINIT to see what we're up |
5381 | * to. |
5382 | */ |
51470298 |
5383 | { |
4763c1c2 |
5384 | char *str, *preferred; |
3d9449a1 |
5385 | int i, j, len; |
51470298 |
5386 | |
ff3187f6 |
5387 | if (pktin->type != SSH2_MSG_KEXINIT) { |
6b5cf8b4 |
5388 | bombout(("expected key exchange packet from server")); |
7ffdbc1a |
5389 | crStop(0); |
32874aea |
5390 | } |
51470298 |
5391 | ssh->kex = NULL; |
5392 | ssh->hostkey = NULL; |
5393 | s->cscipher_tobe = NULL; |
5394 | s->sccipher_tobe = NULL; |
5395 | s->csmac_tobe = NULL; |
5396 | s->scmac_tobe = NULL; |
5397 | s->cscomp_tobe = NULL; |
5398 | s->sccomp_tobe = NULL; |
4763c1c2 |
5399 | s->warn_kex = s->warn_cscipher = s->warn_sccipher = FALSE; |
5400 | |
ff3187f6 |
5401 | pktin->savedpos += 16; /* skip garbage cookie */ |
5402 | ssh_pkt_getstring(pktin, &str, &len); /* key exchange algorithms */ |
4763c1c2 |
5403 | |
5404 | preferred = NULL; |
83e7d008 |
5405 | for (i = 0; i < s->n_preferred_kex; i++) { |
34557659 |
5406 | const struct ssh_kexes *k = s->preferred_kex[i]; |
83e7d008 |
5407 | if (!k) { |
4763c1c2 |
5408 | s->warn_kex = TRUE; |
5409 | } else { |
34557659 |
5410 | for (j = 0; j < k->nkexes; j++) { |
5411 | if (!preferred) preferred = k->list[j]->name; |
5412 | if (in_commasep_string(k->list[j]->name, str, len)) { |
5413 | ssh->kex = k->list[j]; |
5414 | break; |
5415 | } |
5416 | } |
83e7d008 |
5417 | } |
4763c1c2 |
5418 | if (ssh->kex) |
51470298 |
5419 | break; |
32874aea |
5420 | } |
83e7d008 |
5421 | if (!ssh->kex) { |
5422 | bombout(("Couldn't agree a key exchange algorithm (available: %s)", |
5423 | str ? str : "(null)")); |
5424 | crStop(0); |
5425 | } |
b59743d5 |
5426 | /* |
5427 | * Note that the server's guess is considered wrong if it doesn't match |
5428 | * the first algorithm in our list, even if it's still the algorithm |
5429 | * we end up using. |
5430 | */ |
4763c1c2 |
5431 | s->guessok = first_in_commasep_string(preferred, str, len); |
ff3187f6 |
5432 | ssh_pkt_getstring(pktin, &str, &len); /* host key algorithms */ |
51470298 |
5433 | for (i = 0; i < lenof(hostkey_algs); i++) { |
5434 | if (in_commasep_string(hostkey_algs[i]->name, str, len)) { |
5435 | ssh->hostkey = hostkey_algs[i]; |
5436 | break; |
5437 | } |
5438 | } |
3d9449a1 |
5439 | s->guessok = s->guessok && |
b59743d5 |
5440 | first_in_commasep_string(hostkey_algs[0]->name, str, len); |
ff3187f6 |
5441 | ssh_pkt_getstring(pktin, &str, &len); /* client->server cipher */ |
51470298 |
5442 | for (i = 0; i < s->n_preferred_ciphers; i++) { |
5443 | const struct ssh2_ciphers *c = s->preferred_ciphers[i]; |
5444 | if (!c) { |
4763c1c2 |
5445 | s->warn_cscipher = TRUE; |
51470298 |
5446 | } else { |
5447 | for (j = 0; j < c->nciphers; j++) { |
5448 | if (in_commasep_string(c->list[j]->name, str, len)) { |
5449 | s->cscipher_tobe = c->list[j]; |
5450 | break; |
5451 | } |
ca20bfcf |
5452 | } |
32874aea |
5453 | } |
4763c1c2 |
5454 | if (s->cscipher_tobe) |
51470298 |
5455 | break; |
32874aea |
5456 | } |
51470298 |
5457 | if (!s->cscipher_tobe) { |
6b5cf8b4 |
5458 | bombout(("Couldn't agree a client-to-server cipher (available: %s)", |
57356d63 |
5459 | str ? str : "(null)")); |
7ffdbc1a |
5460 | crStop(0); |
ca20bfcf |
5461 | } |
0ef8f407 |
5462 | |
ff3187f6 |
5463 | ssh_pkt_getstring(pktin, &str, &len); /* server->client cipher */ |
51470298 |
5464 | for (i = 0; i < s->n_preferred_ciphers; i++) { |
5465 | const struct ssh2_ciphers *c = s->preferred_ciphers[i]; |
5466 | if (!c) { |
4763c1c2 |
5467 | s->warn_sccipher = TRUE; |
51470298 |
5468 | } else { |
5469 | for (j = 0; j < c->nciphers; j++) { |
5470 | if (in_commasep_string(c->list[j]->name, str, len)) { |
5471 | s->sccipher_tobe = c->list[j]; |
5472 | break; |
5473 | } |
ca20bfcf |
5474 | } |
32874aea |
5475 | } |
4763c1c2 |
5476 | if (s->sccipher_tobe) |
51470298 |
5477 | break; |
32874aea |
5478 | } |
51470298 |
5479 | if (!s->sccipher_tobe) { |
6b5cf8b4 |
5480 | bombout(("Couldn't agree a server-to-client cipher (available: %s)", |
57356d63 |
5481 | str ? str : "(null)")); |
7ffdbc1a |
5482 | crStop(0); |
ca20bfcf |
5483 | } |
0ef8f407 |
5484 | |
ff3187f6 |
5485 | ssh_pkt_getstring(pktin, &str, &len); /* client->server mac */ |
51470298 |
5486 | for (i = 0; i < s->nmacs; i++) { |
5487 | if (in_commasep_string(s->maclist[i]->name, str, len)) { |
5488 | s->csmac_tobe = s->maclist[i]; |
5489 | break; |
5490 | } |
32874aea |
5491 | } |
ff3187f6 |
5492 | ssh_pkt_getstring(pktin, &str, &len); /* server->client mac */ |
51470298 |
5493 | for (i = 0; i < s->nmacs; i++) { |
5494 | if (in_commasep_string(s->maclist[i]->name, str, len)) { |
5495 | s->scmac_tobe = s->maclist[i]; |
5496 | break; |
5497 | } |
32874aea |
5498 | } |
ff3187f6 |
5499 | ssh_pkt_getstring(pktin, &str, &len); /* client->server compression */ |
51470298 |
5500 | for (i = 0; i < lenof(compressions) + 1; i++) { |
5501 | const struct ssh_compress *c = |
5502 | i == 0 ? s->preferred_comp : compressions[i - 1]; |
5503 | if (in_commasep_string(c->name, str, len)) { |
5504 | s->cscomp_tobe = c; |
5505 | break; |
5506 | } |
32874aea |
5507 | } |
ff3187f6 |
5508 | ssh_pkt_getstring(pktin, &str, &len); /* server->client compression */ |
51470298 |
5509 | for (i = 0; i < lenof(compressions) + 1; i++) { |
5510 | const struct ssh_compress *c = |
5511 | i == 0 ? s->preferred_comp : compressions[i - 1]; |
5512 | if (in_commasep_string(c->name, str, len)) { |
5513 | s->sccomp_tobe = c; |
5514 | break; |
5515 | } |
32874aea |
5516 | } |
b59743d5 |
5517 | ssh_pkt_getstring(pktin, &str, &len); /* client->server language */ |
5518 | ssh_pkt_getstring(pktin, &str, &len); /* server->client language */ |
4763c1c2 |
5519 | s->ignorepkt = ssh2_pkt_getbool(pktin) && !s->guessok; |
5520 | |
5521 | if (s->warn_kex) { |
5522 | ssh_set_frozen(ssh, 1); |
5523 | s->dlgret = askalg(ssh->frontend, "key-exchange algorithm", |
5524 | ssh->kex->name, |
5525 | ssh_dialog_callback, ssh); |
5526 | if (s->dlgret < 0) { |
5527 | do { |
5528 | crReturn(0); |
5529 | if (pktin) { |
5530 | bombout(("Unexpected data from server while" |
5531 | " waiting for user response")); |
5532 | crStop(0); |
5533 | } |
5534 | } while (pktin || inlen > 0); |
5535 | s->dlgret = ssh->user_response; |
5536 | } |
5537 | ssh_set_frozen(ssh, 0); |
5538 | if (s->dlgret == 0) { |
9e296bfa |
5539 | ssh_disconnect(ssh, "User aborted at kex warning", NULL, |
5540 | 0, TRUE); |
a5a6f839 |
5541 | crStop(0); |
4763c1c2 |
5542 | } |
5543 | } |
5544 | |
5545 | if (s->warn_cscipher) { |
5546 | ssh_set_frozen(ssh, 1); |
5547 | s->dlgret = askalg(ssh->frontend, |
5548 | "client-to-server cipher", |
5549 | s->cscipher_tobe->name, |
5550 | ssh_dialog_callback, ssh); |
5551 | if (s->dlgret < 0) { |
5552 | do { |
5553 | crReturn(0); |
5554 | if (pktin) { |
5555 | bombout(("Unexpected data from server while" |
5556 | " waiting for user response")); |
5557 | crStop(0); |
5558 | } |
5559 | } while (pktin || inlen > 0); |
5560 | s->dlgret = ssh->user_response; |
5561 | } |
5562 | ssh_set_frozen(ssh, 0); |
5563 | if (s->dlgret == 0) { |
9e296bfa |
5564 | ssh_disconnect(ssh, "User aborted at cipher warning", NULL, |
5565 | 0, TRUE); |
a5a6f839 |
5566 | crStop(0); |
4763c1c2 |
5567 | } |
5568 | } |
5569 | |
5570 | if (s->warn_sccipher) { |
5571 | ssh_set_frozen(ssh, 1); |
5572 | s->dlgret = askalg(ssh->frontend, |
5573 | "server-to-client cipher", |
5574 | s->sccipher_tobe->name, |
5575 | ssh_dialog_callback, ssh); |
5576 | if (s->dlgret < 0) { |
5577 | do { |
5578 | crReturn(0); |
5579 | if (pktin) { |
5580 | bombout(("Unexpected data from server while" |
5581 | " waiting for user response")); |
5582 | crStop(0); |
5583 | } |
5584 | } while (pktin || inlen > 0); |
5585 | s->dlgret = ssh->user_response; |
5586 | } |
5587 | ssh_set_frozen(ssh, 0); |
5588 | if (s->dlgret == 0) { |
9e296bfa |
5589 | ssh_disconnect(ssh, "User aborted at cipher warning", NULL, |
5590 | 0, TRUE); |
a5a6f839 |
5591 | crStop(0); |
4763c1c2 |
5592 | } |
5593 | } |
5594 | |
b672f405 |
5595 | ssh->exhash = ssh->kex->hash->init(); |
5596 | hash_string(ssh->kex->hash, ssh->exhash, ssh->v_c, strlen(ssh->v_c)); |
5597 | hash_string(ssh->kex->hash, ssh->exhash, ssh->v_s, strlen(ssh->v_s)); |
5598 | hash_string(ssh->kex->hash, ssh->exhash, |
5599 | s->our_kexinit, s->our_kexinitlen); |
3dc9a6a7 |
5600 | sfree(s->our_kexinit); |
5601 | if (pktin->length > 5) |
b672f405 |
5602 | hash_string(ssh->kex->hash, ssh->exhash, |
5603 | pktin->data + 5, pktin->length - 5); |
3dc9a6a7 |
5604 | |
4763c1c2 |
5605 | if (s->ignorepkt) /* first_kex_packet_follows */ |
b59743d5 |
5606 | crWaitUntil(pktin); /* Ignore packet */ |
e5574168 |
5607 | } |
e5574168 |
5608 | |
fae1a71b |
5609 | if (ssh->kex->main_type == KEXTYPE_DH) { |
30774ba3 |
5610 | /* |
5611 | * Work out the number of bits of key we will need from the |
5612 | * key exchange. We start with the maximum key length of |
5613 | * either cipher... |
5614 | */ |
5615 | { |
5616 | int csbits, scbits; |
5617 | |
5618 | csbits = s->cscipher_tobe->keylen; |
5619 | scbits = s->sccipher_tobe->keylen; |
5620 | s->nbits = (csbits > scbits ? csbits : scbits); |
5621 | } |
5622 | /* The keys only have hlen-bit entropy, since they're based on |
5623 | * a hash. So cap the key size at hlen bits. */ |
5624 | if (s->nbits > ssh->kex->hash->hlen * 8) |
5625 | s->nbits = ssh->kex->hash->hlen * 8; |
5626 | |
5627 | /* |
5628 | * If we're doing Diffie-Hellman group exchange, start by |
5629 | * requesting a group. |
5630 | */ |
5631 | if (!ssh->kex->pdata) { |
5632 | logevent("Doing Diffie-Hellman group exchange"); |
5633 | ssh->pkt_ctx |= SSH2_PKTCTX_DHGEX; |
5634 | /* |
5635 | * Work out how big a DH group we will need to allow that |
5636 | * much data. |
5637 | */ |
5638 | s->pbits = 512 << ((s->nbits - 1) / 64); |
5639 | s->pktout = ssh2_pkt_init(SSH2_MSG_KEX_DH_GEX_REQUEST); |
5640 | ssh2_pkt_adduint32(s->pktout, s->pbits); |
5641 | ssh2_pkt_send_noqueue(ssh, s->pktout); |
5642 | |
5643 | crWaitUntil(pktin); |
5644 | if (pktin->type != SSH2_MSG_KEX_DH_GEX_GROUP) { |
5645 | bombout(("expected key exchange group packet from server")); |
5646 | crStop(0); |
5647 | } |
5648 | s->p = ssh2_pkt_getmp(pktin); |
5649 | s->g = ssh2_pkt_getmp(pktin); |
5650 | if (!s->p || !s->g) { |
5651 | bombout(("unable to read mp-ints from incoming group packet")); |
5652 | crStop(0); |
5653 | } |
5654 | ssh->kex_ctx = dh_setup_gex(s->p, s->g); |
5655 | s->kex_init_value = SSH2_MSG_KEX_DH_GEX_INIT; |
5656 | s->kex_reply_value = SSH2_MSG_KEX_DH_GEX_REPLY; |
5657 | } else { |
5658 | ssh->pkt_ctx |= SSH2_PKTCTX_DHGROUP; |
5659 | ssh->kex_ctx = dh_setup_group(ssh->kex); |
5660 | s->kex_init_value = SSH2_MSG_KEXDH_INIT; |
5661 | s->kex_reply_value = SSH2_MSG_KEXDH_REPLY; |
5662 | logeventf(ssh, "Using Diffie-Hellman with standard group \"%s\"", |
5663 | ssh->kex->groupname); |
5664 | } |
e5574168 |
5665 | |
30774ba3 |
5666 | logeventf(ssh, "Doing Diffie-Hellman key exchange with hash %s", |
5667 | ssh->kex->hash->text_name); |
5668 | /* |
5669 | * Now generate and send e for Diffie-Hellman. |
5670 | */ |
5671 | set_busy_status(ssh->frontend, BUSY_CPU); /* this can take a while */ |
5672 | s->e = dh_create_e(ssh->kex_ctx, s->nbits * 2); |
5673 | s->pktout = ssh2_pkt_init(s->kex_init_value); |
5674 | ssh2_pkt_addmp(s->pktout, s->e); |
5675 | ssh2_pkt_send_noqueue(ssh, s->pktout); |
5676 | |
5677 | set_busy_status(ssh->frontend, BUSY_WAITING); /* wait for server */ |
5678 | crWaitUntil(pktin); |
5679 | if (pktin->type != s->kex_reply_value) { |
5680 | bombout(("expected key exchange reply packet from server")); |
5681 | crStop(0); |
5682 | } |
5683 | set_busy_status(ssh->frontend, BUSY_CPU); /* cogitate */ |
5684 | ssh_pkt_getstring(pktin, &s->hostkeydata, &s->hostkeylen); |
5685 | s->hkey = ssh->hostkey->newkey(s->hostkeydata, s->hostkeylen); |
5686 | s->f = ssh2_pkt_getmp(pktin); |
5687 | if (!s->f) { |
5688 | bombout(("unable to parse key exchange reply packet")); |
5689 | crStop(0); |
5690 | } |
5691 | ssh_pkt_getstring(pktin, &s->sigdata, &s->siglen); |
e5574168 |
5692 | |
30774ba3 |
5693 | s->K = dh_find_K(ssh->kex_ctx, s->f); |
e5574168 |
5694 | |
30774ba3 |
5695 | /* We assume everything from now on will be quick, and it might |
5696 | * involve user interaction. */ |
5697 | set_busy_status(ssh->frontend, BUSY_NOT); |
755e0524 |
5698 | |
30774ba3 |
5699 | hash_string(ssh->kex->hash, ssh->exhash, s->hostkeydata, s->hostkeylen); |
5700 | if (!ssh->kex->pdata) { |
5701 | hash_uint32(ssh->kex->hash, ssh->exhash, s->pbits); |
5702 | hash_mpint(ssh->kex->hash, ssh->exhash, s->p); |
5703 | hash_mpint(ssh->kex->hash, ssh->exhash, s->g); |
5704 | } |
5705 | hash_mpint(ssh->kex->hash, ssh->exhash, s->e); |
5706 | hash_mpint(ssh->kex->hash, ssh->exhash, s->f); |
5707 | |
5708 | dh_cleanup(ssh->kex_ctx); |
5709 | freebn(s->f); |
5710 | if (!ssh->kex->pdata) { |
5711 | freebn(s->g); |
5712 | freebn(s->p); |
5713 | } |
fae1a71b |
5714 | } else { |
5715 | logeventf(ssh, "Doing RSA key exchange with hash %s", |
5716 | ssh->kex->hash->text_name); |
5717 | ssh->pkt_ctx |= SSH2_PKTCTX_RSAKEX; |
5718 | /* |
5719 | * RSA key exchange. First expect a KEXRSA_PUBKEY packet |
5720 | * from the server. |
5721 | */ |
5722 | crWaitUntil(pktin); |
5723 | if (pktin->type != SSH2_MSG_KEXRSA_PUBKEY) { |
5724 | bombout(("expected RSA public key packet from server")); |
5725 | crStop(0); |
5726 | } |
5727 | |
5728 | ssh_pkt_getstring(pktin, &s->hostkeydata, &s->hostkeylen); |
5729 | hash_string(ssh->kex->hash, ssh->exhash, |
5730 | s->hostkeydata, s->hostkeylen); |
5731 | s->hkey = ssh->hostkey->newkey(s->hostkeydata, s->hostkeylen); |
5732 | |
5733 | { |
5734 | char *keydata; |
5735 | ssh_pkt_getstring(pktin, &keydata, &s->rsakeylen); |
5736 | s->rsakeydata = snewn(s->rsakeylen, char); |
5737 | memcpy(s->rsakeydata, keydata, s->rsakeylen); |
5738 | } |
5739 | |
5740 | s->rsakey = ssh_rsakex_newkey(s->rsakeydata, s->rsakeylen); |
5741 | if (!s->rsakey) { |
5742 | sfree(s->rsakeydata); |
5743 | bombout(("unable to parse RSA public key from server")); |
5744 | crStop(0); |
5745 | } |
5746 | |
5747 | hash_string(ssh->kex->hash, ssh->exhash, s->rsakeydata, s->rsakeylen); |
5748 | |
5749 | /* |
5750 | * Next, set up a shared secret K, of precisely KLEN - |
5751 | * 2*HLEN - 49 bits, where KLEN is the bit length of the |
5752 | * RSA key modulus and HLEN is the bit length of the hash |
5753 | * we're using. |
5754 | */ |
5755 | { |
5756 | int klen = ssh_rsakex_klen(s->rsakey); |
5757 | int nbits = klen - (2*ssh->kex->hash->hlen*8 + 49); |
5758 | int i, byte = 0; |
5759 | unsigned char *kstr1, *kstr2, *outstr; |
5760 | int kstr1len, kstr2len, outstrlen; |
5761 | |
5762 | s->K = bn_power_2(nbits - 1); |
5763 | |
5764 | for (i = 0; i < nbits; i++) { |
5765 | if ((i & 7) == 0) { |
5766 | byte = random_byte(); |
5767 | } |
5768 | bignum_set_bit(s->K, i, (byte >> (i & 7)) & 1); |
5769 | } |
5770 | |
5771 | /* |
5772 | * Encode this as an mpint. |
5773 | */ |
5774 | kstr1 = ssh2_mpint_fmt(s->K, &kstr1len); |
5775 | kstr2 = snewn(kstr2len = 4 + kstr1len, unsigned char); |
5776 | PUT_32BIT(kstr2, kstr1len); |
5777 | memcpy(kstr2 + 4, kstr1, kstr1len); |
5778 | |
5779 | /* |
5780 | * Encrypt it with the given RSA key. |
5781 | */ |
5782 | outstrlen = (klen + 7) / 8; |
5783 | outstr = snewn(outstrlen, unsigned char); |
5784 | ssh_rsakex_encrypt(ssh->kex->hash, kstr2, kstr2len, |
5785 | outstr, outstrlen, s->rsakey); |
5786 | |
5787 | /* |
5788 | * And send it off in a return packet. |
5789 | */ |
5790 | s->pktout = ssh2_pkt_init(SSH2_MSG_KEXRSA_SECRET); |
5791 | ssh2_pkt_addstring_start(s->pktout); |
7108a872 |
5792 | ssh2_pkt_addstring_data(s->pktout, (char *)outstr, outstrlen); |
fae1a71b |
5793 | ssh2_pkt_send_noqueue(ssh, s->pktout); |
5794 | |
5795 | hash_string(ssh->kex->hash, ssh->exhash, outstr, outstrlen); |
5796 | |
5797 | sfree(kstr2); |
5798 | sfree(kstr1); |
5799 | sfree(outstr); |
5800 | } |
5801 | |
5802 | ssh_rsakex_freekey(s->rsakey); |
5803 | |
5804 | crWaitUntil(pktin); |
5805 | if (pktin->type != SSH2_MSG_KEXRSA_DONE) { |
5806 | sfree(s->rsakeydata); |
5807 | bombout(("expected signature packet from server")); |
5808 | crStop(0); |
5809 | } |
5810 | |
5811 | ssh_pkt_getstring(pktin, &s->sigdata, &s->siglen); |
5812 | |
5813 | sfree(s->rsakeydata); |
5814 | } |
5815 | |
b672f405 |
5816 | hash_mpint(ssh->kex->hash, ssh->exhash, s->K); |
5817 | assert(ssh->kex->hash->hlen <= sizeof(s->exchange_hash)); |
5818 | ssh->kex->hash->final(ssh->exhash, s->exchange_hash); |
e5574168 |
5819 | |
fabd1805 |
5820 | ssh->kex_ctx = NULL; |
3709bfe9 |
5821 | |
7cca0d81 |
5822 | #if 0 |
765c4200 |
5823 | debug(("Exchange hash is:\n")); |
b672f405 |
5824 | dmemdump(s->exchange_hash, ssh->kex->hash->hlen); |
7cca0d81 |
5825 | #endif |
5826 | |
51470298 |
5827 | if (!s->hkey || |
5828 | !ssh->hostkey->verifysig(s->hkey, s->sigdata, s->siglen, |
b672f405 |
5829 | (char *)s->exchange_hash, |
5830 | ssh->kex->hash->hlen)) { |
6b5cf8b4 |
5831 | bombout(("Server's host key did not match the signature supplied")); |
7ffdbc1a |
5832 | crStop(0); |
8d5de777 |
5833 | } |
e5574168 |
5834 | |
5835 | /* |
7cca0d81 |
5836 | * Authenticate remote host: verify host key. (We've already |
5837 | * checked the signature of the exchange hash.) |
e5574168 |
5838 | */ |
51470298 |
5839 | s->keystr = ssh->hostkey->fmtkey(s->hkey); |
5840 | s->fingerprint = ssh->hostkey->fingerprint(s->hkey); |
3d9449a1 |
5841 | ssh_set_frozen(ssh, 1); |
5842 | s->dlgret = verify_ssh_host_key(ssh->frontend, |
5843 | ssh->savedhost, ssh->savedport, |
5844 | ssh->hostkey->keytype, s->keystr, |
5845 | s->fingerprint, |
5846 | ssh_dialog_callback, ssh); |
5847 | if (s->dlgret < 0) { |
5848 | do { |
5849 | crReturn(0); |
5850 | if (pktin) { |
5851 | bombout(("Unexpected data from server while waiting" |
5852 | " for user host key response")); |
5853 | crStop(0); |
5854 | } |
5855 | } while (pktin || inlen > 0); |
5856 | s->dlgret = ssh->user_response; |
5857 | } |
5858 | ssh_set_frozen(ssh, 0); |
5859 | if (s->dlgret == 0) { |
9e296bfa |
5860 | ssh_disconnect(ssh, "User aborted at host key verification", NULL, |
5861 | 0, TRUE); |
3d9449a1 |
5862 | crStop(0); |
5863 | } |
e13bba36 |
5864 | if (!s->got_session_id) { /* don't bother logging this in rekeys */ |
5e0d7cb8 |
5865 | logevent("Host key fingerprint is:"); |
51470298 |
5866 | logevent(s->fingerprint); |
5e0d7cb8 |
5867 | } |
51470298 |
5868 | sfree(s->fingerprint); |
5869 | sfree(s->keystr); |
5870 | ssh->hostkey->freekey(s->hkey); |
d39f364a |
5871 | |
5872 | /* |
9442dd57 |
5873 | * The exchange hash from the very first key exchange is also |
5874 | * the session id, used in session key construction and |
5875 | * authentication. |
5876 | */ |
e13bba36 |
5877 | if (!s->got_session_id) { |
b672f405 |
5878 | assert(sizeof(s->exchange_hash) <= sizeof(ssh->v2_session_id)); |
9442dd57 |
5879 | memcpy(ssh->v2_session_id, s->exchange_hash, |
5880 | sizeof(s->exchange_hash)); |
b672f405 |
5881 | ssh->v2_session_id_len = ssh->kex->hash->hlen; |
6052bb76 |
5882 | assert(ssh->v2_session_id_len <= sizeof(ssh->v2_session_id)); |
e13bba36 |
5883 | s->got_session_id = TRUE; |
5884 | } |
9442dd57 |
5885 | |
5886 | /* |
7cca0d81 |
5887 | * Send SSH2_MSG_NEWKEYS. |
d39f364a |
5888 | */ |
ff3187f6 |
5889 | s->pktout = ssh2_pkt_init(SSH2_MSG_NEWKEYS); |
590f6a5f |
5890 | ssh2_pkt_send_noqueue(ssh, s->pktout); |
9442dd57 |
5891 | ssh->outgoing_data_size = 0; /* start counting from here */ |
5892 | |
5893 | /* |
5894 | * We've sent client NEWKEYS, so create and initialise |
c64fe7d4 |
5895 | * client-to-server session keys. |
9442dd57 |
5896 | */ |
5897 | if (ssh->cs_cipher_ctx) |
5898 | ssh->cscipher->free_context(ssh->cs_cipher_ctx); |
5899 | ssh->cscipher = s->cscipher_tobe; |
5900 | ssh->cs_cipher_ctx = ssh->cscipher->make_context(); |
5901 | |
5902 | if (ssh->cs_mac_ctx) |
5903 | ssh->csmac->free_context(ssh->cs_mac_ctx); |
5904 | ssh->csmac = s->csmac_tobe; |
5905 | ssh->cs_mac_ctx = ssh->csmac->make_context(); |
5906 | |
5907 | if (ssh->cs_comp_ctx) |
5908 | ssh->cscomp->compress_cleanup(ssh->cs_comp_ctx); |
5909 | ssh->cscomp = s->cscomp_tobe; |
5910 | ssh->cs_comp_ctx = ssh->cscomp->compress_init(); |
5911 | |
5912 | /* |
5913 | * Set IVs on client-to-server keys. Here we use the exchange |
5914 | * hash from the _first_ key exchange. |
5915 | */ |
5916 | { |
754c0df9 |
5917 | unsigned char keyspace[SSH2_KEX_MAX_HASH_LEN * SSH2_MKKEY_ITERS]; |
5918 | assert(sizeof(keyspace) >= ssh->kex->hash->hlen * SSH2_MKKEY_ITERS); |
b672f405 |
5919 | ssh2_mkkey(ssh,s->K,s->exchange_hash,'C',keyspace); |
754c0df9 |
5920 | assert((ssh->cscipher->keylen+7) / 8 <= |
5921 | ssh->kex->hash->hlen * SSH2_MKKEY_ITERS); |
9442dd57 |
5922 | ssh->cscipher->setkey(ssh->cs_cipher_ctx, keyspace); |
b672f405 |
5923 | ssh2_mkkey(ssh,s->K,s->exchange_hash,'A',keyspace); |
754c0df9 |
5924 | assert(ssh->cscipher->blksize <= |
5925 | ssh->kex->hash->hlen * SSH2_MKKEY_ITERS); |
9442dd57 |
5926 | ssh->cscipher->setiv(ssh->cs_cipher_ctx, keyspace); |
b672f405 |
5927 | ssh2_mkkey(ssh,s->K,s->exchange_hash,'E',keyspace); |
754c0df9 |
5928 | assert(ssh->csmac->len <= |
5929 | ssh->kex->hash->hlen * SSH2_MKKEY_ITERS); |
9442dd57 |
5930 | ssh->csmac->setkey(ssh->cs_mac_ctx, keyspace); |
754c0df9 |
5931 | memset(keyspace, 0, sizeof(keyspace)); |
9442dd57 |
5932 | } |
5933 | |
5934 | logeventf(ssh, "Initialised %.200s client->server encryption", |
5935 | ssh->cscipher->text_name); |
5936 | logeventf(ssh, "Initialised %.200s client->server MAC algorithm", |
5937 | ssh->csmac->text_name); |
5938 | if (ssh->cscomp->text_name) |
5939 | logeventf(ssh, "Initialised %s compression", |
5940 | ssh->cscomp->text_name); |
590f6a5f |
5941 | |
5942 | /* |
5943 | * Now our end of the key exchange is complete, we can send all |
5944 | * our queued higher-layer packets. |
5945 | */ |
5946 | ssh->queueing = FALSE; |
5947 | ssh2_pkt_queuesend(ssh); |
d39f364a |
5948 | |
5949 | /* |
8406eaf9 |
5950 | * Expect SSH2_MSG_NEWKEYS from server. |
5951 | */ |
ff3187f6 |
5952 | crWaitUntil(pktin); |
5953 | if (pktin->type != SSH2_MSG_NEWKEYS) { |
6b5cf8b4 |
5954 | bombout(("expected new-keys packet from server")); |
7ffdbc1a |
5955 | crStop(0); |
8406eaf9 |
5956 | } |
9442dd57 |
5957 | ssh->incoming_data_size = 0; /* start counting from here */ |
8406eaf9 |
5958 | |
5959 | /* |
9442dd57 |
5960 | * We've seen server NEWKEYS, so create and initialise |
5961 | * server-to-client session keys. |
d39f364a |
5962 | */ |
371e569c |
5963 | if (ssh->sc_cipher_ctx) |
5964 | ssh->sccipher->free_context(ssh->sc_cipher_ctx); |
51470298 |
5965 | ssh->sccipher = s->sccipher_tobe; |
371e569c |
5966 | ssh->sc_cipher_ctx = ssh->sccipher->make_context(); |
e0e1a00d |
5967 | |
e0e1a00d |
5968 | if (ssh->sc_mac_ctx) |
5969 | ssh->scmac->free_context(ssh->sc_mac_ctx); |
51470298 |
5970 | ssh->scmac = s->scmac_tobe; |
e0e1a00d |
5971 | ssh->sc_mac_ctx = ssh->scmac->make_context(); |
5972 | |
5366aed8 |
5973 | if (ssh->sc_comp_ctx) |
5974 | ssh->sccomp->decompress_cleanup(ssh->sc_comp_ctx); |
51470298 |
5975 | ssh->sccomp = s->sccomp_tobe; |
5366aed8 |
5976 | ssh->sc_comp_ctx = ssh->sccomp->decompress_init(); |
5977 | |
d39f364a |
5978 | /* |
9442dd57 |
5979 | * Set IVs on server-to-client keys. Here we use the exchange |
5980 | * hash from the _first_ key exchange. |
d39f364a |
5981 | */ |
51470298 |
5982 | { |
754c0df9 |
5983 | unsigned char keyspace[SSH2_KEX_MAX_HASH_LEN * SSH2_MKKEY_ITERS]; |
5984 | assert(sizeof(keyspace) >= ssh->kex->hash->hlen * SSH2_MKKEY_ITERS); |
b672f405 |
5985 | ssh2_mkkey(ssh,s->K,s->exchange_hash,'D',keyspace); |
754c0df9 |
5986 | assert((ssh->sccipher->keylen+7) / 8 <= |
5987 | ssh->kex->hash->hlen * SSH2_MKKEY_ITERS); |
371e569c |
5988 | ssh->sccipher->setkey(ssh->sc_cipher_ctx, keyspace); |
b672f405 |
5989 | ssh2_mkkey(ssh,s->K,s->exchange_hash,'B',keyspace); |
754c0df9 |
5990 | assert(ssh->sccipher->blksize <= |
5991 | ssh->kex->hash->hlen * SSH2_MKKEY_ITERS); |
371e569c |
5992 | ssh->sccipher->setiv(ssh->sc_cipher_ctx, keyspace); |
b672f405 |
5993 | ssh2_mkkey(ssh,s->K,s->exchange_hash,'F',keyspace); |
754c0df9 |
5994 | assert(ssh->scmac->len <= |
5995 | ssh->kex->hash->hlen * SSH2_MKKEY_ITERS); |
e0e1a00d |
5996 | ssh->scmac->setkey(ssh->sc_mac_ctx, keyspace); |
754c0df9 |
5997 | memset(keyspace, 0, sizeof(keyspace)); |
51470298 |
5998 | } |
57356d63 |
5999 | logeventf(ssh, "Initialised %.200s server->client encryption", |
6000 | ssh->sccipher->text_name); |
6c135243 |
6001 | logeventf(ssh, "Initialised %.200s server->client MAC algorithm", |
6002 | ssh->scmac->text_name); |
57356d63 |
6003 | if (ssh->sccomp->text_name) |
6004 | logeventf(ssh, "Initialised %s decompression", |
6005 | ssh->sccomp->text_name); |
9442dd57 |
6006 | |
6007 | /* |
fae1a71b |
6008 | * Free shared secret. |
9442dd57 |
6009 | */ |
679539d7 |
6010 | freebn(s->K); |
d39f364a |
6011 | |
033b4cef |
6012 | /* |
e13bba36 |
6013 | * Key exchange is over. Loop straight back round if we have a |
6014 | * deferred rekey reason. |
6015 | */ |
6016 | if (ssh->deferred_rekey_reason) { |
6017 | logevent(ssh->deferred_rekey_reason); |
6018 | pktin = NULL; |
6019 | ssh->deferred_rekey_reason = NULL; |
6020 | goto begin_key_exchange; |
6021 | } |
6022 | |
6023 | /* |
6024 | * Otherwise, schedule a timer for our next rekey. |
9442dd57 |
6025 | */ |
6026 | ssh->kex_in_progress = FALSE; |
e6c1536e |
6027 | ssh->last_rekey = GETTICKCOUNT(); |
d57f70af |
6028 | if (ssh->cfg.ssh_rekey_time != 0) |
6029 | ssh->next_rekey = schedule_timer(ssh->cfg.ssh_rekey_time*60*TICKSPERSEC, |
6030 | ssh2_timer, ssh); |
e13bba36 |
6031 | |
9442dd57 |
6032 | /* |
0db56f73 |
6033 | * If this is the first key exchange phase, we must pass the |
6034 | * SSH2_MSG_NEWKEYS packet to the next layer, not because it |
6035 | * wants to see it but because it will need time to initialise |
6036 | * itself before it sees an actual packet. In subsequent key |
6037 | * exchange phases, we don't pass SSH2_MSG_NEWKEYS on, because |
6038 | * it would only confuse the layer above. |
6039 | */ |
e13bba36 |
6040 | if (s->activated_authconn) { |
0e3607ed |
6041 | crReturn(0); |
0db56f73 |
6042 | } |
e13bba36 |
6043 | s->activated_authconn = TRUE; |
0db56f73 |
6044 | |
6045 | /* |
7cca0d81 |
6046 | * Now we're encrypting. Begin returning 1 to the protocol main |
6047 | * function so that other things can run on top of the |
6048 | * transport. If we ever see a KEXINIT, we must go back to the |
6049 | * start. |
9442dd57 |
6050 | * |
6051 | * We _also_ go back to the start if we see pktin==NULL and |
6052 | * inlen==-1, because this is a special signal meaning |
6053 | * `initiate client-driven rekey', and `in' contains a message |
6054 | * giving the reason for the rekey. |
033b4cef |
6055 | */ |
9442dd57 |
6056 | while (!((pktin && pktin->type == SSH2_MSG_KEXINIT) || |
6057 | (!pktin && inlen == -1))) { |
f382c87d |
6058 | wait_for_rekey: |
32874aea |
6059 | crReturn(1); |
e96adf72 |
6060 | } |
9442dd57 |
6061 | if (pktin) { |
6062 | logevent("Server initiated key re-exchange"); |
6063 | } else { |
f382c87d |
6064 | /* |
6065 | * Special case: if the server bug is set that doesn't |
6066 | * allow rekeying, we give a different log message and |
6067 | * continue waiting. (If such a server _initiates_ a rekey, |
6068 | * we process it anyway!) |
6069 | */ |
6070 | if ((ssh->remote_bugs & BUG_SSH2_REKEY)) { |
6071 | logeventf(ssh, "Server bug prevents key re-exchange (%s)", |
6072 | (char *)in); |
6073 | /* Reset the counters, so that at least this message doesn't |
6074 | * hit the event log _too_ often. */ |
6075 | ssh->outgoing_data_size = 0; |
6076 | ssh->incoming_data_size = 0; |
6077 | if (ssh->cfg.ssh_rekey_time != 0) { |
6078 | ssh->next_rekey = |
6079 | schedule_timer(ssh->cfg.ssh_rekey_time*60*TICKSPERSEC, |
6080 | ssh2_timer, ssh); |
6081 | } |
6082 | goto wait_for_rekey; /* this is utterly horrid */ |
6083 | } else { |
6084 | logeventf(ssh, "Initiating key re-exchange (%s)", (char *)in); |
f382c87d |
6085 | } |
9442dd57 |
6086 | } |
7cca0d81 |
6087 | goto begin_key_exchange; |
e5574168 |
6088 | |
6089 | crFinish(1); |
6090 | } |
6091 | |
7cca0d81 |
6092 | /* |
2e85c969 |
6093 | * Add data to an SSH-2 channel output buffer. |
783415f8 |
6094 | */ |
32874aea |
6095 | static void ssh2_add_channel_data(struct ssh_channel *c, char *buf, |
6096 | int len) |
6097 | { |
5471d09a |
6098 | bufchain_add(&c->v.v2.outbuffer, buf, len); |
783415f8 |
6099 | } |
6100 | |
6101 | /* |
2e85c969 |
6102 | * Attempt to send data on an SSH-2 channel. |
783415f8 |
6103 | */ |
5471d09a |
6104 | static int ssh2_try_send(struct ssh_channel *c) |
32874aea |
6105 | { |
51470298 |
6106 | Ssh ssh = c->ssh; |
ff3187f6 |
6107 | struct Packet *pktout; |
51470298 |
6108 | |
5471d09a |
6109 | while (c->v.v2.remwindow > 0 && bufchain_size(&c->v.v2.outbuffer) > 0) { |
6110 | int len; |
6111 | void *data; |
6112 | bufchain_prefix(&c->v.v2.outbuffer, &data, &len); |
6113 | if ((unsigned)len > c->v.v2.remwindow) |
6114 | len = c->v.v2.remwindow; |
6115 | if ((unsigned)len > c->v.v2.remmaxpkt) |
6116 | len = c->v.v2.remmaxpkt; |
ff3187f6 |
6117 | pktout = ssh2_pkt_init(SSH2_MSG_CHANNEL_DATA); |
6118 | ssh2_pkt_adduint32(pktout, c->remoteid); |
6119 | dont_log_data(ssh, pktout, PKTLOG_OMIT); |
6120 | ssh2_pkt_addstring_start(pktout); |
6121 | ssh2_pkt_addstring_data(pktout, data, len); |
6122 | end_log_omission(ssh, pktout); |
6123 | ssh2_pkt_send(ssh, pktout); |
5471d09a |
6124 | bufchain_consume(&c->v.v2.outbuffer, len); |
6125 | c->v.v2.remwindow -= len; |
6126 | } |
6127 | |
6128 | /* |
6129 | * After having sent as much data as we can, return the amount |
6130 | * still buffered. |
6131 | */ |
6132 | return bufchain_size(&c->v.v2.outbuffer); |
6133 | } |
6134 | |
1bfc7e93 |
6135 | static void ssh2_try_send_and_unthrottle(struct ssh_channel *c) |
6136 | { |
6137 | int bufsize; |
6138 | if (c->closes) |
6139 | return; /* don't send on closing channels */ |
6140 | bufsize = ssh2_try_send(c); |
6141 | if (bufsize == 0) { |
6142 | switch (c->type) { |
6143 | case CHAN_MAINSESSION: |
6144 | /* stdin need not receive an unthrottle |
6145 | * notification since it will be polled */ |
6146 | break; |
6147 | case CHAN_X11: |
6148 | x11_unthrottle(c->u.x11.s); |
6149 | break; |
6150 | case CHAN_AGENT: |
6151 | /* agent sockets are request/response and need no |
6152 | * buffer management */ |
6153 | break; |
6154 | case CHAN_SOCKDATA: |
6155 | pfd_unthrottle(c->u.pfd.s); |
6156 | break; |
6157 | } |
6158 | } |
6159 | } |
6160 | |
5471d09a |
6161 | /* |
2e85c969 |
6162 | * Potentially enlarge the window on an SSH-2 channel. |
5471d09a |
6163 | */ |
6164 | static void ssh2_set_window(struct ssh_channel *c, unsigned newwin) |
6165 | { |
51470298 |
6166 | Ssh ssh = c->ssh; |
6167 | |
6b69f42e |
6168 | /* |
6169 | * Never send WINDOW_ADJUST for a channel that the remote side |
6170 | * already thinks it's closed; there's no point, since it won't |
6171 | * be sending any more data anyway. |
6172 | */ |
6173 | if (c->closes != 0) |
6174 | return; |
6175 | |
d252310a |
6176 | /* |
6177 | * Only send a WINDOW_ADJUST if there's significantly more window |
6178 | * available than the other end thinks there is. This saves us |
6179 | * sending a WINDOW_ADJUST for every character in a shell session. |
6180 | * |
6181 | * "Significant" is arbitrarily defined as half the window size. |
6182 | */ |
6183 | if (newwin > c->v.v2.locwindow * 2) { |
ff3187f6 |
6184 | struct Packet *pktout; |
6185 | |
6186 | pktout = ssh2_pkt_init(SSH2_MSG_CHANNEL_WINDOW_ADJUST); |
6187 | ssh2_pkt_adduint32(pktout, c->remoteid); |
6188 | ssh2_pkt_adduint32(pktout, newwin - c->v.v2.locwindow); |
6189 | ssh2_pkt_send(ssh, pktout); |
5471d09a |
6190 | c->v.v2.locwindow = newwin; |
783415f8 |
6191 | } |
6192 | } |
6193 | |
51df0ab5 |
6194 | static void ssh2_msg_channel_window_adjust(Ssh ssh, struct Packet *pktin) |
b09eaa88 |
6195 | { |
6196 | unsigned i = ssh_pkt_getuint32(pktin); |
6197 | struct ssh_channel *c; |
6198 | c = find234(ssh->channels, &i, ssh_channelfind); |
1bfc7e93 |
6199 | if (c && !c->closes) { |
b09eaa88 |
6200 | c->v.v2.remwindow += ssh_pkt_getuint32(pktin); |
1bfc7e93 |
6201 | ssh2_try_send_and_unthrottle(c); |
6202 | } |
b09eaa88 |
6203 | } |
6204 | |
51df0ab5 |
6205 | static void ssh2_msg_channel_data(Ssh ssh, struct Packet *pktin) |
6206 | { |
6207 | char *data; |
6d44acc9 |
6208 | int length; |
51df0ab5 |
6209 | unsigned i = ssh_pkt_getuint32(pktin); |
6210 | struct ssh_channel *c; |
6211 | c = find234(ssh->channels, &i, ssh_channelfind); |
6212 | if (!c) |
6213 | return; /* nonexistent channel */ |
6214 | if (pktin->type == SSH2_MSG_CHANNEL_EXTENDED_DATA && |
6215 | ssh_pkt_getuint32(pktin) != SSH2_EXTENDED_DATA_STDERR) |
6216 | return; /* extended but not stderr */ |
6217 | ssh_pkt_getstring(pktin, &data, &length); |
6218 | if (data) { |
6219 | int bufsize = 0; |
6220 | c->v.v2.locwindow -= length; |
6221 | switch (c->type) { |
6222 | case CHAN_MAINSESSION: |
6223 | bufsize = |
6224 | from_backend(ssh->frontend, pktin->type == |
6225 | SSH2_MSG_CHANNEL_EXTENDED_DATA, |
6226 | data, length); |
6227 | break; |
6228 | case CHAN_X11: |
6229 | bufsize = x11_send(c->u.x11.s, data, length); |
6230 | break; |
6231 | case CHAN_SOCKDATA: |
6232 | bufsize = pfd_send(c->u.pfd.s, data, length); |
6233 | break; |
6234 | case CHAN_AGENT: |
6235 | while (length > 0) { |
6236 | if (c->u.a.lensofar < 4) { |
62ddb51e |
6237 | unsigned int l = min(4 - c->u.a.lensofar, |
6238 | (unsigned)length); |
51df0ab5 |
6239 | memcpy(c->u.a.msglen + c->u.a.lensofar, |
6240 | data, l); |
6241 | data += l; |
6242 | length -= l; |
6243 | c->u.a.lensofar += l; |
6244 | } |
6245 | if (c->u.a.lensofar == 4) { |
6246 | c->u.a.totallen = |
6247 | 4 + GET_32BIT(c->u.a.msglen); |
6248 | c->u.a.message = snewn(c->u.a.totallen, |
6249 | unsigned char); |
6250 | memcpy(c->u.a.message, c->u.a.msglen, 4); |
6251 | } |
6252 | if (c->u.a.lensofar >= 4 && length > 0) { |
aa63ab7e |
6253 | unsigned int l = |
51df0ab5 |
6254 | min(c->u.a.totallen - c->u.a.lensofar, |
62ddb51e |
6255 | (unsigned)length); |
51df0ab5 |
6256 | memcpy(c->u.a.message + c->u.a.lensofar, |
6257 | data, l); |
6258 | data += l; |
6259 | length -= l; |
6260 | c->u.a.lensofar += l; |
6261 | } |
6262 | if (c->u.a.lensofar == c->u.a.totallen) { |
6263 | void *reply; |
6264 | int replylen; |
6265 | if (agent_query(c->u.a.message, |
6266 | c->u.a.totallen, |
6267 | &reply, &replylen, |
6268 | ssh_agentf_callback, c)) |
6269 | ssh_agentf_callback(c, reply, replylen); |
6270 | sfree(c->u.a.message); |
6271 | c->u.a.lensofar = 0; |
6272 | } |
6273 | } |
6274 | bufsize = 0; |
6275 | break; |
6276 | } |
6277 | /* |
6278 | * If we are not buffering too much data, |
6279 | * enlarge the window again at the remote side. |
6280 | */ |
6281 | if (bufsize < OUR_V2_WINSIZE) |
6282 | ssh2_set_window(c, OUR_V2_WINSIZE - bufsize); |
6283 | } |
6284 | } |
6285 | |
6286 | static void ssh2_msg_channel_eof(Ssh ssh, struct Packet *pktin) |
6287 | { |
6288 | unsigned i = ssh_pkt_getuint32(pktin); |
6289 | struct ssh_channel *c; |
6290 | |
6291 | c = find234(ssh->channels, &i, ssh_channelfind); |
6292 | if (!c) |
6293 | return; /* nonexistent channel */ |
6294 | |
6295 | if (c->type == CHAN_X11) { |
6296 | /* |
6297 | * Remote EOF on an X11 channel means we should |
6298 | * wrap up and close the channel ourselves. |
6299 | */ |
6300 | x11_close(c->u.x11.s); |
6301 | sshfwd_close(c); |
6302 | } else if (c->type == CHAN_AGENT) { |
6303 | sshfwd_close(c); |
6304 | } else if (c->type == CHAN_SOCKDATA) { |
6305 | pfd_close(c->u.pfd.s); |
6306 | sshfwd_close(c); |
6307 | } |
6308 | } |
6309 | |
6310 | static void ssh2_msg_channel_close(Ssh ssh, struct Packet *pktin) |
6311 | { |
6312 | unsigned i = ssh_pkt_getuint32(pktin); |
6313 | struct ssh_channel *c; |
6314 | struct Packet *pktout; |
6315 | |
6316 | c = find234(ssh->channels, &i, ssh_channelfind); |
64d6ff88 |
6317 | if (!c || c->halfopen) { |
51df0ab5 |
6318 | bombout(("Received CHANNEL_CLOSE for %s channel %d\n", |
6319 | c ? "half-open" : "nonexistent", i)); |
6320 | return; |
6321 | } |
6322 | /* Do pre-close processing on the channel. */ |
6323 | switch (c->type) { |
6324 | case CHAN_MAINSESSION: |
6325 | ssh->mainchan = NULL; |
6326 | update_specials_menu(ssh->frontend); |
6327 | break; |
6328 | case CHAN_X11: |
6329 | if (c->u.x11.s != NULL) |
6330 | x11_close(c->u.x11.s); |
6331 | sshfwd_close(c); |
6332 | break; |
6333 | case CHAN_AGENT: |
6334 | sshfwd_close(c); |
6335 | break; |
6336 | case CHAN_SOCKDATA: |
6337 | if (c->u.pfd.s != NULL) |
6338 | pfd_close(c->u.pfd.s); |
6339 | sshfwd_close(c); |
6340 | break; |
6341 | } |
6342 | if (c->closes == 0) { |
6343 | pktout = ssh2_pkt_init(SSH2_MSG_CHANNEL_CLOSE); |
6344 | ssh2_pkt_adduint32(pktout, c->remoteid); |
6345 | ssh2_pkt_send(ssh, pktout); |
6346 | } |
6347 | del234(ssh->channels, c); |
6348 | bufchain_clear(&c->v.v2.outbuffer); |
6349 | sfree(c); |
6350 | |
6351 | /* |
6352 | * See if that was the last channel left open. |
6353 | * (This is only our termination condition if we're |
6354 | * not running in -N mode.) |
6355 | */ |
6356 | if (!ssh->cfg.ssh_no_shell && count234(ssh->channels) == 0) { |
51df0ab5 |
6357 | /* |
6358 | * We used to send SSH_MSG_DISCONNECT here, |
6359 | * because I'd believed that _every_ conforming |
2e85c969 |
6360 | * SSH-2 connection had to end with a disconnect |
51df0ab5 |
6361 | * being sent by at least one side; apparently |
6362 | * I was wrong and it's perfectly OK to |
6363 | * unceremoniously slam the connection shut |
6364 | * when you're done, and indeed OpenSSH feels |
6365 | * this is more polite than sending a |
6366 | * DISCONNECT. So now we don't. |
6367 | */ |
9e296bfa |
6368 | ssh_disconnect(ssh, "All channels closed", NULL, 0, TRUE); |
51df0ab5 |
6369 | } |
6370 | } |
6371 | |
6372 | static void ssh2_msg_channel_open_confirmation(Ssh ssh, struct Packet *pktin) |
6373 | { |
6374 | unsigned i = ssh_pkt_getuint32(pktin); |
6375 | struct ssh_channel *c; |
6376 | struct Packet *pktout; |
6377 | |
6378 | c = find234(ssh->channels, &i, ssh_channelfind); |
6379 | if (!c) |
6380 | return; /* nonexistent channel */ |
6381 | if (c->type != CHAN_SOCKDATA_DORMANT) |
6382 | return; /* dunno why they're confirming this */ |
6383 | c->remoteid = ssh_pkt_getuint32(pktin); |
64d6ff88 |
6384 | c->halfopen = FALSE; |
51df0ab5 |
6385 | c->type = CHAN_SOCKDATA; |
6386 | c->v.v2.remwindow = ssh_pkt_getuint32(pktin); |
6387 | c->v.v2.remmaxpkt = ssh_pkt_getuint32(pktin); |
6388 | if (c->u.pfd.s) |
6389 | pfd_confirm(c->u.pfd.s); |
6390 | if (c->closes) { |
6391 | /* |
6392 | * We have a pending close on this channel, |
6393 | * which we decided on before the server acked |
6394 | * the channel open. So now we know the |
6395 | * remoteid, we can close it again. |
6396 | */ |
6397 | pktout = ssh2_pkt_init(SSH2_MSG_CHANNEL_CLOSE); |
6398 | ssh2_pkt_adduint32(pktout, c->remoteid); |
6399 | ssh2_pkt_send(ssh, pktout); |
6400 | } |
6401 | } |
6402 | |
6403 | static void ssh2_msg_channel_open_failure(Ssh ssh, struct Packet *pktin) |
6404 | { |
6405 | static const char *const reasons[] = { |
6406 | "<unknown reason code>", |
6407 | "Administratively prohibited", |
6408 | "Connect failed", |
6409 | "Unknown channel type", |
6410 | "Resource shortage", |
6411 | }; |
6412 | unsigned i = ssh_pkt_getuint32(pktin); |
6413 | unsigned reason_code; |
6414 | char *reason_string; |
6415 | int reason_length; |
51df0ab5 |
6416 | struct ssh_channel *c; |
6417 | c = find234(ssh->channels, &i, ssh_channelfind); |
6418 | if (!c) |
6419 | return; /* nonexistent channel */ |
6420 | if (c->type != CHAN_SOCKDATA_DORMANT) |
6421 | return; /* dunno why they're failing this */ |
6422 | |
6423 | reason_code = ssh_pkt_getuint32(pktin); |
6424 | if (reason_code >= lenof(reasons)) |
6425 | reason_code = 0; /* ensure reasons[reason_code] in range */ |
6426 | ssh_pkt_getstring(pktin, &reason_string, &reason_length); |
fb983202 |
6427 | logeventf(ssh, "Forwarded connection refused by server: %s [%.*s]", |
6428 | reasons[reason_code], reason_length, reason_string); |
51df0ab5 |
6429 | |
6430 | pfd_close(c->u.pfd.s); |
6431 | |
6432 | del234(ssh->channels, c); |
6433 | sfree(c); |
6434 | } |
6435 | |
6436 | static void ssh2_msg_channel_request(Ssh ssh, struct Packet *pktin) |
6437 | { |
6438 | unsigned localid; |
6439 | char *type; |
6440 | int typelen, want_reply; |
6441 | int reply = SSH2_MSG_CHANNEL_FAILURE; /* default */ |
6442 | struct ssh_channel *c; |
6443 | struct Packet *pktout; |
6444 | |
6445 | localid = ssh_pkt_getuint32(pktin); |
6446 | ssh_pkt_getstring(pktin, &type, &typelen); |
6447 | want_reply = ssh2_pkt_getbool(pktin); |
6448 | |
6449 | /* |
6450 | * First, check that the channel exists. Otherwise, |
6451 | * we can instantly disconnect with a rude message. |
6452 | */ |
6453 | c = find234(ssh->channels, &localid, ssh_channelfind); |
6454 | if (!c) { |
9e296bfa |
6455 | char *buf = dupprintf("Received channel request for nonexistent" |
6456 | " channel %d", localid); |
6457 | ssh_disconnect(ssh, NULL, buf, SSH2_DISCONNECT_PROTOCOL_ERROR, FALSE); |
6458 | sfree(buf); |
51df0ab5 |
6459 | return; |
6460 | } |
6461 | |
6462 | /* |
6463 | * Having got the channel number, we now look at |
6464 | * the request type string to see if it's something |
6465 | * we recognise. |
6466 | */ |
6467 | if (c == ssh->mainchan) { |
6468 | /* |
6469 | * We recognise "exit-status" and "exit-signal" on |
6470 | * the primary channel. |
6471 | */ |
6472 | if (typelen == 11 && |
6473 | !memcmp(type, "exit-status", 11)) { |
6474 | |
6475 | ssh->exitcode = ssh_pkt_getuint32(pktin); |
6476 | logeventf(ssh, "Server sent command exit status %d", |
6477 | ssh->exitcode); |
6478 | reply = SSH2_MSG_CHANNEL_SUCCESS; |
6479 | |
6480 | } else if (typelen == 11 && |
6481 | !memcmp(type, "exit-signal", 11)) { |
6482 | |
6483 | int is_plausible = TRUE, is_int = FALSE; |
6484 | char *fmt_sig = "", *fmt_msg = ""; |
6485 | char *msg; |
6486 | int msglen = 0, core = FALSE; |
6487 | /* ICK: older versions of OpenSSH (e.g. 3.4p1) |
6488 | * provide an `int' for the signal, despite its |
6489 | * having been a `string' in the drafts since at |
6490 | * least 2001. (Fixed in session.c 1.147.) Try to |
6491 | * infer which we can safely parse it as. */ |
6492 | { |
6493 | unsigned char *p = pktin->body + |
6494 | pktin->savedpos; |
6495 | long len = pktin->length - pktin->savedpos; |
6496 | unsigned long num = GET_32BIT(p); /* what is it? */ |
6497 | /* If it's 0, it hardly matters; assume string */ |
6498 | if (num == 0) { |
6499 | is_int = FALSE; |
6500 | } else { |
6501 | int maybe_int = FALSE, maybe_str = FALSE; |
6502 | #define CHECK_HYPOTHESIS(offset, result) \ |
6503 | do { \ |
6504 | long q = offset; \ |
6505 | if (q >= 0 && q+4 <= len) { \ |
6506 | q = q + 4 + GET_32BIT(p+q); \ |
6507 | if (q >= 0 && q+4 <= len && \ |
c849ff23 |
6508 | ((q = q + 4 + GET_32BIT(p+q))!= 0) && q == len) \ |
51df0ab5 |
6509 | result = TRUE; \ |
6510 | } \ |
6511 | } while(0) |
6512 | CHECK_HYPOTHESIS(4+1, maybe_int); |
6513 | CHECK_HYPOTHESIS(4+num+1, maybe_str); |
6514 | #undef CHECK_HYPOTHESIS |
6515 | if (maybe_int && !maybe_str) |
6516 | is_int = TRUE; |
6517 | else if (!maybe_int && maybe_str) |
6518 | is_int = FALSE; |
6519 | else |
6520 | /* Crikey. Either or neither. Panic. */ |
6521 | is_plausible = FALSE; |
6522 | } |
6523 | } |
d051d1b4 |
6524 | ssh->exitcode = 128; /* means `unknown signal' */ |
51df0ab5 |
6525 | if (is_plausible) { |
6526 | if (is_int) { |
6527 | /* Old non-standard OpenSSH. */ |
6528 | int signum = ssh_pkt_getuint32(pktin); |
6529 | fmt_sig = dupprintf(" %d", signum); |
d051d1b4 |
6530 | ssh->exitcode = 128 + signum; |
51df0ab5 |
6531 | } else { |
6532 | /* As per the drafts. */ |
6533 | char *sig; |
6534 | int siglen; |
6535 | ssh_pkt_getstring(pktin, &sig, &siglen); |
6536 | /* Signal name isn't supposed to be blank, but |
6537 | * let's cope gracefully if it is. */ |
6538 | if (siglen) { |
6539 | fmt_sig = dupprintf(" \"%.*s\"", |
6540 | siglen, sig); |
6541 | } |
d051d1b4 |
6542 | |
6543 | /* |
6544 | * Really hideous method of translating the |
6545 | * signal description back into a locally |
6546 | * meaningful number. |
6547 | */ |
6548 | |
6549 | if (0) |
6550 | ; |
b707973a |
6551 | #define TRANSLATE_SIGNAL(s) \ |
6552 | else if (siglen == lenof(#s)-1 && !memcmp(sig, #s, siglen)) \ |
6553 | ssh->exitcode = 128 + SIG ## s |
d051d1b4 |
6554 | #ifdef SIGABRT |
b707973a |
6555 | TRANSLATE_SIGNAL(ABRT); |
d051d1b4 |
6556 | #endif |
6557 | #ifdef SIGALRM |
b707973a |
6558 | TRANSLATE_SIGNAL(ALRM); |
d051d1b4 |
6559 | #endif |
6560 | #ifdef SIGFPE |
b707973a |
6561 | TRANSLATE_SIGNAL(FPE); |
d051d1b4 |
6562 | #endif |
6563 | #ifdef SIGHUP |
b707973a |
6564 | TRANSLATE_SIGNAL(HUP); |
d051d1b4 |
6565 | #endif |
6566 | #ifdef SIGILL |
b707973a |
6567 | TRANSLATE_SIGNAL(ILL); |
d051d1b4 |
6568 | #endif |
6569 | #ifdef SIGINT |
b707973a |
6570 | TRANSLATE_SIGNAL(INT); |
d051d1b4 |
6571 | #endif |
6572 | #ifdef SIGKILL |
b707973a |
6573 | TRANSLATE_SIGNAL(KILL); |
d051d1b4 |
6574 | #endif |
6575 | #ifdef SIGPIPE |
b707973a |
6576 | TRANSLATE_SIGNAL(PIPE); |
d051d1b4 |
6577 | #endif |
6578 | #ifdef SIGQUIT |
b707973a |
6579 | TRANSLATE_SIGNAL(QUIT); |
d051d1b4 |
6580 | #endif |
6581 | #ifdef SIGSEGV |
b707973a |
6582 | TRANSLATE_SIGNAL(SEGV); |
d051d1b4 |
6583 | #endif |
6584 | #ifdef SIGTERM |
b707973a |
6585 | TRANSLATE_SIGNAL(TERM); |
d051d1b4 |
6586 | #endif |
6587 | #ifdef SIGUSR1 |
b707973a |
6588 | TRANSLATE_SIGNAL(USR1); |
d051d1b4 |
6589 | #endif |
6590 | #ifdef SIGUSR2 |
b707973a |
6591 | TRANSLATE_SIGNAL(USR2); |
d051d1b4 |
6592 | #endif |
b707973a |
6593 | #undef TRANSLATE_SIGNAL |
d051d1b4 |
6594 | else |
6595 | ssh->exitcode = 128; |
51df0ab5 |
6596 | } |
6597 | core = ssh2_pkt_getbool(pktin); |
6598 | ssh_pkt_getstring(pktin, &msg, &msglen); |
6599 | if (msglen) { |
6600 | fmt_msg = dupprintf(" (\"%.*s\")", msglen, msg); |
6601 | } |
6602 | /* ignore lang tag */ |
6603 | } /* else don't attempt to parse */ |
6604 | logeventf(ssh, "Server exited on signal%s%s%s", |
6605 | fmt_sig, core ? " (core dumped)" : "", |
6606 | fmt_msg); |
6607 | if (*fmt_sig) sfree(fmt_sig); |
6608 | if (*fmt_msg) sfree(fmt_msg); |
6609 | reply = SSH2_MSG_CHANNEL_SUCCESS; |
6610 | |
6611 | } |
6612 | } else { |
6613 | /* |
6614 | * This is a channel request we don't know |
6615 | * about, so we now either ignore the request |
6616 | * or respond with CHANNEL_FAILURE, depending |
6617 | * on want_reply. |
6618 | */ |
6619 | reply = SSH2_MSG_CHANNEL_FAILURE; |
6620 | } |
6621 | if (want_reply) { |
6622 | pktout = ssh2_pkt_init(reply); |
6623 | ssh2_pkt_adduint32(pktout, c->remoteid); |
6624 | ssh2_pkt_send(ssh, pktout); |
6625 | } |
6626 | } |
6627 | |
6628 | static void ssh2_msg_global_request(Ssh ssh, struct Packet *pktin) |
6629 | { |
6630 | char *type; |
6631 | int typelen, want_reply; |
6632 | struct Packet *pktout; |
6633 | |
6634 | ssh_pkt_getstring(pktin, &type, &typelen); |
6635 | want_reply = ssh2_pkt_getbool(pktin); |
6636 | |
6637 | /* |
6638 | * We currently don't support any global requests |
6639 | * at all, so we either ignore the request or |
6640 | * respond with REQUEST_FAILURE, depending on |
6641 | * want_reply. |
6642 | */ |
6643 | if (want_reply) { |
6644 | pktout = ssh2_pkt_init(SSH2_MSG_REQUEST_FAILURE); |
6645 | ssh2_pkt_send(ssh, pktout); |
6646 | } |
6647 | } |
6648 | |
6649 | static void ssh2_msg_channel_open(Ssh ssh, struct Packet *pktin) |
6650 | { |
6651 | char *type; |
6652 | int typelen; |
6653 | char *peeraddr; |
6654 | int peeraddrlen; |
6655 | int peerport; |
6656 | char *error = NULL; |
6657 | struct ssh_channel *c; |
6658 | unsigned remid, winsize, pktsize; |
6659 | struct Packet *pktout; |
6660 | |
6661 | ssh_pkt_getstring(pktin, &type, &typelen); |
6662 | c = snew(struct ssh_channel); |
6663 | c->ssh = ssh; |
6664 | |
6665 | remid = ssh_pkt_getuint32(pktin); |
6666 | winsize = ssh_pkt_getuint32(pktin); |
6667 | pktsize = ssh_pkt_getuint32(pktin); |
6668 | |
6669 | if (typelen == 3 && !memcmp(type, "x11", 3)) { |
6670 | char *addrstr; |
6671 | |
6672 | ssh_pkt_getstring(pktin, &peeraddr, &peeraddrlen); |
6673 | addrstr = snewn(peeraddrlen+1, char); |
6674 | memcpy(addrstr, peeraddr, peeraddrlen); |
6675 | addrstr[peeraddrlen] = '\0'; |
6676 | peerport = ssh_pkt_getuint32(pktin); |
6677 | |
6678 | logeventf(ssh, "Received X11 connect request from %s:%d", |
6679 | addrstr, peerport); |
6680 | |
6681 | if (!ssh->X11_fwd_enabled) |
6682 | error = "X11 forwarding is not enabled"; |
6683 | else if (x11_init(&c->u.x11.s, ssh->cfg.x11_display, c, |
6684 | ssh->x11auth, addrstr, peerport, |
6685 | &ssh->cfg) != NULL) { |
6686 | error = "Unable to open an X11 connection"; |
6687 | } else { |
6688 | logevent("Opening X11 forward connection succeeded"); |
6689 | c->type = CHAN_X11; |
6690 | } |
6691 | |
6692 | sfree(addrstr); |
6693 | } else if (typelen == 15 && |
6694 | !memcmp(type, "forwarded-tcpip", 15)) { |
6695 | struct ssh_rportfwd pf, *realpf; |
6696 | char *dummy; |
6697 | int dummylen; |
6698 | ssh_pkt_getstring(pktin, &dummy, &dummylen);/* skip address */ |
6699 | pf.sport = ssh_pkt_getuint32(pktin); |
6700 | ssh_pkt_getstring(pktin, &peeraddr, &peeraddrlen); |
6701 | peerport = ssh_pkt_getuint32(pktin); |
6702 | realpf = find234(ssh->rportfwds, &pf, NULL); |
6703 | logeventf(ssh, "Received remote port %d open request " |
6704 | "from %s:%d", pf.sport, peeraddr, peerport); |
6705 | if (realpf == NULL) { |
6706 | error = "Remote port is not recognised"; |
6707 | } else { |
6708 | const char *e = pfd_newconnect(&c->u.pfd.s, |
6709 | realpf->dhost, |
6710 | realpf->dport, c, |
05581745 |
6711 | &ssh->cfg, |
6712 | realpf->pfrec->addressfamily); |
51df0ab5 |
6713 | logeventf(ssh, "Attempting to forward remote port to " |
6714 | "%s:%d", realpf->dhost, realpf->dport); |
6715 | if (e != NULL) { |
6716 | logeventf(ssh, "Port open failed: %s", e); |
6717 | error = "Port open failed"; |
6718 | } else { |
6719 | logevent("Forwarded port opened successfully"); |
6720 | c->type = CHAN_SOCKDATA; |
6721 | } |
6722 | } |
6723 | } else if (typelen == 22 && |
c49cf994 |
6724 | !memcmp(type, "auth-agent@openssh.com", 22)) { |
51df0ab5 |
6725 | if (!ssh->agentfwd_enabled) |
6726 | error = "Agent forwarding is not enabled"; |
6727 | else { |
6728 | c->type = CHAN_AGENT; /* identify channel type */ |
6729 | c->u.a.lensofar = 0; |
6730 | } |
6731 | } else { |
6732 | error = "Unsupported channel type requested"; |
6733 | } |
6734 | |
6735 | c->remoteid = remid; |
64d6ff88 |
6736 | c->halfopen = FALSE; |
51df0ab5 |
6737 | if (error) { |
6738 | pktout = ssh2_pkt_init(SSH2_MSG_CHANNEL_OPEN_FAILURE); |
6739 | ssh2_pkt_adduint32(pktout, c->remoteid); |
6740 | ssh2_pkt_adduint32(pktout, SSH2_OPEN_CONNECT_FAILED); |
6741 | ssh2_pkt_addstring(pktout, error); |
6742 | ssh2_pkt_addstring(pktout, "en"); /* language tag */ |
6743 | ssh2_pkt_send(ssh, pktout); |
6744 | logeventf(ssh, "Rejected channel open: %s", error); |
6745 | sfree(c); |
6746 | } else { |
6747 | c->localid = alloc_channel_id(ssh); |
6748 | c->closes = 0; |
6749 | c->v.v2.locwindow = OUR_V2_WINSIZE; |
6750 | c->v.v2.remwindow = winsize; |
6751 | c->v.v2.remmaxpkt = pktsize; |
6752 | bufchain_init(&c->v.v2.outbuffer); |
6753 | add234(ssh->channels, c); |
6754 | pktout = ssh2_pkt_init(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); |
6755 | ssh2_pkt_adduint32(pktout, c->remoteid); |
6756 | ssh2_pkt_adduint32(pktout, c->localid); |
6757 | ssh2_pkt_adduint32(pktout, c->v.v2.locwindow); |
954d5c5a |
6758 | ssh2_pkt_adduint32(pktout, OUR_V2_MAXPKT); /* our max pkt size */ |
51df0ab5 |
6759 | ssh2_pkt_send(ssh, pktout); |
6760 | } |
6761 | } |
6762 | |
6bbce591 |
6763 | /* |
6764 | * Buffer banner messages for later display at some convenient point. |
6765 | */ |
6766 | static void ssh2_msg_userauth_banner(Ssh ssh, struct Packet *pktin) |
6767 | { |
6768 | /* Arbitrary limit to prevent unbounded inflation of buffer */ |
6769 | if (bufchain_size(&ssh->banner) <= 131072) { |
6770 | char *banner = NULL; |
6771 | int size = 0; |
6772 | ssh_pkt_getstring(pktin, &banner, &size); |
6773 | if (banner) |
6774 | bufchain_add(&ssh->banner, banner, size); |
6775 | } |
6776 | } |
6777 | |
c6ccd5c2 |
6778 | /* Helper function to deal with sending tty modes for "pty-req" */ |
6779 | static void ssh2_send_ttymode(void *data, char *mode, char *val) |
6780 | { |
6781 | struct Packet *pktout = (struct Packet *)data; |
6782 | int i = 0; |
6783 | unsigned int arg = 0; |
6784 | while (strcmp(mode, ssh_ttymodes[i].mode) != 0) i++; |
6785 | if (i == lenof(ssh_ttymodes)) return; |
6786 | switch (ssh_ttymodes[i].type) { |
6787 | case TTY_OP_CHAR: |
6788 | arg = ssh_tty_parse_specchar(val); |
6789 | break; |
6790 | case TTY_OP_BOOL: |
6791 | arg = ssh_tty_parse_boolean(val); |
6792 | break; |
6793 | } |
6794 | ssh2_pkt_addbyte(pktout, ssh_ttymodes[i].opcode); |
6795 | ssh2_pkt_adduint32(pktout, arg); |
6796 | } |
6797 | |
783415f8 |
6798 | /* |
2e85c969 |
6799 | * Handle the SSH-2 userauth and connection layers. |
7cca0d81 |
6800 | */ |
ff3187f6 |
6801 | static void do_ssh2_authconn(Ssh ssh, unsigned char *in, int inlen, |
6802 | struct Packet *pktin) |
7cca0d81 |
6803 | { |
51470298 |
6804 | struct do_ssh2_authconn_state { |
6805 | enum { |
51470298 |
6806 | AUTH_TYPE_NONE, |
6807 | AUTH_TYPE_PUBLICKEY, |
6808 | AUTH_TYPE_PUBLICKEY_OFFER_LOUD, |
6809 | AUTH_TYPE_PUBLICKEY_OFFER_QUIET, |
6810 | AUTH_TYPE_PASSWORD, |
6811 | AUTH_TYPE_KEYBOARD_INTERACTIVE, |
6812 | AUTH_TYPE_KEYBOARD_INTERACTIVE_QUIET |
6813 | } type; |
a1a1fae4 |
6814 | int done_service_req; |
51470298 |
6815 | int gotit, need_pw, can_pubkey, can_passwd, can_keyb_inter; |
94cd7c3a |
6816 | int tried_pubkey_config, done_agent; |
edd0cb8a |
6817 | int kbd_inter_refused; |
51470298 |
6818 | int we_are_in; |
edd0cb8a |
6819 | prompts_t *cur_prompt; |
6820 | int num_prompts; |
51470298 |
6821 | char username[100]; |
e955d348 |
6822 | char *password; |
51470298 |
6823 | int got_username; |
51470298 |
6824 | void *publickey_blob; |
6825 | int publickey_bloblen; |
edd0cb8a |
6826 | int publickey_encrypted; |
6827 | char *publickey_algorithm; |
6828 | char *publickey_comment; |
94cd7c3a |
6829 | unsigned char agent_request[5], *agent_response, *agentp; |
6830 | int agent_responselen; |
6831 | unsigned char *pkblob_in_agent; |
51470298 |
6832 | int keyi, nkeys; |
51470298 |
6833 | char *pkblob, *alg, *commentp; |
6834 | int pklen, alglen, commentlen; |
6835 | int siglen, retlen, len; |
6836 | char *q, *agentreq, *ret; |
6837 | int try_send; |
73feed4f |
6838 | int num_env, env_left, env_ok; |
ff3187f6 |
6839 | struct Packet *pktout; |
51470298 |
6840 | }; |
6841 | crState(do_ssh2_authconn_state); |
6842 | |
6843 | crBegin(ssh->do_ssh2_authconn_crstate); |
e5574168 |
6844 | |
a1a1fae4 |
6845 | s->done_service_req = FALSE; |
6846 | s->we_are_in = FALSE; |
6847 | if (!ssh->cfg.ssh_no_userauth) { |
6848 | /* |
6849 | * Request userauth protocol, and await a response to it. |
6850 | */ |
6851 | s->pktout = ssh2_pkt_init(SSH2_MSG_SERVICE_REQUEST); |
6852 | ssh2_pkt_addstring(s->pktout, "ssh-userauth"); |
6853 | ssh2_pkt_send(ssh, s->pktout); |
6854 | crWaitUntilV(pktin); |
6855 | if (pktin->type == SSH2_MSG_SERVICE_ACCEPT) |
6856 | s->done_service_req = TRUE; |
6857 | } |
6858 | if (!s->done_service_req) { |
6859 | /* |
6860 | * Request connection protocol directly, without authentication. |
6861 | */ |
6862 | s->pktout = ssh2_pkt_init(SSH2_MSG_SERVICE_REQUEST); |
6863 | ssh2_pkt_addstring(s->pktout, "ssh-connection"); |
6864 | ssh2_pkt_send(ssh, s->pktout); |
6865 | crWaitUntilV(pktin); |
6866 | if (pktin->type == SSH2_MSG_SERVICE_ACCEPT) { |
6867 | s->we_are_in = TRUE; /* no auth required */ |
6868 | } else { |
6869 | bombout(("Server refused service request")); |
6870 | crStopV; |
6871 | } |
8d5de777 |
6872 | } |
7cca0d81 |
6873 | |
94cd7c3a |
6874 | /* Arrange to be able to deal with any BANNERs that come in. |
6875 | * (We do this now as packets may come in during the next bit.) */ |
6876 | bufchain_init(&ssh->banner); |
6877 | ssh->packet_dispatch[SSH2_MSG_USERAUTH_BANNER] = |
6878 | ssh2_msg_userauth_banner; |
6879 | |
7cca0d81 |
6880 | /* |
edd0cb8a |
6881 | * Misc one-time setup for authentication. |
6882 | */ |
6883 | s->publickey_blob = NULL; |
6884 | if (!s->we_are_in) { |
6885 | |
6886 | /* |
6887 | * Load the public half of any configured public key file |
6888 | * for later use. |
6889 | */ |
6890 | if (!filename_is_null(ssh->cfg.keyfile)) { |
6891 | int keytype; |
6892 | logeventf(ssh, "Reading private key file \"%.150s\"", |
6893 | filename_to_str(&ssh->cfg.keyfile)); |
6894 | keytype = key_type(&ssh->cfg.keyfile); |
6895 | if (keytype == SSH_KEYTYPE_SSH2) { |
6896 | const char *error; |
6897 | s->publickey_blob = |
6898 | ssh2_userkey_loadpub(&ssh->cfg.keyfile, |
6899 | &s->publickey_algorithm, |
6900 | &s->publickey_bloblen, |
6901 | &s->publickey_comment, &error); |
6902 | if (s->publickey_blob) { |
6903 | s->publickey_encrypted = |
6904 | ssh2_userkey_encrypted(&ssh->cfg.keyfile, NULL); |
6905 | } else { |
6906 | char *msgbuf; |
6907 | logeventf(ssh, "Unable to load private key (%s)", |
6908 | error); |
6909 | msgbuf = dupprintf("Unable to load private key file " |
6910 | "\"%.150s\" (%s)\r\n", |
6911 | filename_to_str(&ssh->cfg.keyfile), |
6912 | error); |
6913 | c_write_str(ssh, msgbuf); |
6914 | sfree(msgbuf); |
6915 | } |
6916 | } else { |
6917 | char *msgbuf; |
6918 | logeventf(ssh, "Unable to use this key file (%s)", |
6919 | key_type_to_str(keytype)); |
6920 | msgbuf = dupprintf("Unable to use key file \"%.150s\"" |
6921 | " (%s)\r\n", |
6922 | filename_to_str(&ssh->cfg.keyfile), |
6923 | key_type_to_str(keytype)); |
6924 | c_write_str(ssh, msgbuf); |
6925 | sfree(msgbuf); |
6926 | s->publickey_blob = NULL; |
6927 | } |
6928 | } |
6929 | |
94cd7c3a |
6930 | /* |
6931 | * Find out about any keys Pageant has (but if there's a |
6932 | * public key configured, filter out all others). |
6933 | */ |
6934 | s->nkeys = 0; |
6935 | s->agent_response = NULL; |
6936 | s->pkblob_in_agent = NULL; |
116f229d |
6937 | if (ssh->cfg.tryagent && agent_exists()) { |
94cd7c3a |
6938 | |
6939 | void *r; |
6940 | |
6941 | logevent("Pageant is running. Requesting keys."); |
6942 | |
6943 | /* Request the keys held by the agent. */ |
6944 | PUT_32BIT(s->agent_request, 1); |
6945 | s->agent_request[4] = SSH2_AGENTC_REQUEST_IDENTITIES; |
6946 | if (!agent_query(s->agent_request, 5, &r, &s->agent_responselen, |
6947 | ssh_agent_callback, ssh)) { |
6948 | do { |
6949 | crReturnV; |
6950 | if (pktin) { |
6951 | bombout(("Unexpected data from server while" |
6952 | " waiting for agent response")); |
6953 | crStopV; |
6954 | } |
6955 | } while (pktin || inlen > 0); |
6956 | r = ssh->agent_response; |
6957 | s->agent_responselen = ssh->agent_response_len; |
6958 | } |
6959 | s->agent_response = (unsigned char *) r; |
6960 | if (s->agent_response && s->agent_responselen >= 5 && |
6961 | s->agent_response[4] == SSH2_AGENT_IDENTITIES_ANSWER) { |
6962 | int keyi; |
6963 | unsigned char *p; |
6964 | p = s->agent_response + 5; |
6965 | s->nkeys = GET_32BIT(p); |
6966 | p += 4; |
6967 | logeventf(ssh, "Pageant has %d SSH-2 keys", s->nkeys); |
6968 | if (s->publickey_blob) { |
6969 | /* See if configured key is in agent. */ |
6970 | for (keyi = 0; keyi < s->nkeys; keyi++) { |
6971 | s->pklen = GET_32BIT(p); |
6972 | if (s->pklen == s->publickey_bloblen && |
6973 | !memcmp(p+4, s->publickey_blob, |
6974 | s->publickey_bloblen)) { |
6975 | logeventf(ssh, "Pageant key #%d matches " |
6976 | "configured key file", keyi); |
6977 | s->keyi = keyi; |
6978 | s->pkblob_in_agent = p; |
6979 | break; |
6980 | } |
6981 | p += 4 + s->pklen; |
6982 | p += GET_32BIT(p) + 4; /* comment */ |
6983 | } |
6984 | if (!s->pkblob_in_agent) { |
6985 | logevent("Configured key file not in Pageant"); |
6986 | s->nkeys = 0; |
6987 | } |
6988 | } |
6989 | } |
6990 | } |
6991 | |
edd0cb8a |
6992 | } |
6993 | |
6994 | /* |
1408a877 |
6995 | * We repeat this whole loop, including the username prompt, |
6996 | * until we manage a successful authentication. If the user |
51470298 |
6997 | * types the wrong _password_, they can be sent back to the |
6998 | * beginning to try another username, if this is configured on. |
6999 | * (If they specify a username in the config, they are never |
7000 | * asked, even if they do give a wrong password.) |
1408a877 |
7001 | * |
7002 | * I think this best serves the needs of |
7003 | * |
7004 | * - the people who have no configuration, no keys, and just |
7005 | * want to try repeated (username,password) pairs until they |
7006 | * type both correctly |
7007 | * |
7008 | * - people who have keys and configuration but occasionally |
7009 | * need to fall back to passwords |
7010 | * |
7011 | * - people with a key held in Pageant, who might not have |
7012 | * logged in to a particular machine before; so they want to |
7013 | * type a username, and then _either_ their key will be |
7014 | * accepted, _or_ they will type a password. If they mistype |
7015 | * the username they will want to be able to get back and |
7016 | * retype it! |
7cca0d81 |
7017 | */ |
51470298 |
7018 | s->username[0] = '\0'; |
7019 | s->got_username = FALSE; |
a1a1fae4 |
7020 | while (!s->we_are_in) { |
1408a877 |
7021 | /* |
7022 | * Get a username. |
7023 | */ |
86916870 |
7024 | if (s->got_username && !ssh->cfg.change_username) { |
5bb641e1 |
7025 | /* |
7026 | * We got a username last time round this loop, and |
7027 | * with change_username turned off we don't try to get |
7028 | * it again. |
7029 | */ |
aa09f7d0 |
7030 | } else if (!*ssh->cfg.username) { |
edd0cb8a |
7031 | int ret; /* need not be kept over crReturn */ |
7032 | s->cur_prompt = new_prompts(ssh->frontend); |
7033 | s->cur_prompt->to_server = TRUE; |
7034 | s->cur_prompt->name = dupstr("SSH login name"); |
7035 | add_prompt(s->cur_prompt, dupstr("login as: "), TRUE, |
7036 | lenof(s->username)); |
7037 | ret = get_userpass_input(s->cur_prompt, NULL, 0); |
7038 | while (ret < 0) { |
51470298 |
7039 | ssh->send_ok = 1; |
edd0cb8a |
7040 | crWaitUntilV(!pktin); |
7041 | ret = get_userpass_input(s->cur_prompt, in, inlen); |
7042 | ssh->send_ok = 0; |
32874aea |
7043 | } |
edd0cb8a |
7044 | if (!ret) { |
7045 | /* |
7046 | * get_userpass_input() failed to get a username. |
7047 | * Terminate. |
7048 | */ |
7049 | free_prompts(s->cur_prompt); |
7050 | ssh_disconnect(ssh, "No username provided", NULL, 0, TRUE); |
7051 | crStopV; |
7052 | } |
7053 | memcpy(s->username, s->cur_prompt->prompts[0]->result, |
7054 | lenof(s->username)); |
7055 | free_prompts(s->cur_prompt); |
7cca0d81 |
7056 | } else { |
57356d63 |
7057 | char *stuff; |
86916870 |
7058 | strncpy(s->username, ssh->cfg.username, sizeof(s->username)); |
51470298 |
7059 | s->username[sizeof(s->username)-1] = '\0'; |
65a22376 |
7060 | if ((flags & FLAG_VERBOSE) || (flags & FLAG_INTERACTIVE)) { |
57356d63 |
7061 | stuff = dupprintf("Using username \"%s\".\r\n", s->username); |
51470298 |
7062 | c_write_str(ssh, stuff); |
57356d63 |
7063 | sfree(stuff); |
7cca0d81 |
7064 | } |
7065 | } |
51470298 |
7066 | s->got_username = TRUE; |
7cca0d81 |
7067 | |
65a22376 |
7068 | /* |
1408a877 |
7069 | * Send an authentication request using method "none": (a) |
7070 | * just in case it succeeds, and (b) so that we know what |
7071 | * authentication methods we can usefully try next. |
65a22376 |
7072 | */ |
51470298 |
7073 | ssh->pkt_ctx &= ~SSH2_PKTCTX_AUTH_MASK; |
7074 | |
ff3187f6 |
7075 | s->pktout = ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST); |
7076 | ssh2_pkt_addstring(s->pktout, s->username); |
7077 | ssh2_pkt_addstring(s->pktout, "ssh-connection");/* service requested */ |
7078 | ssh2_pkt_addstring(s->pktout, "none"); /* method */ |
7079 | ssh2_pkt_send(ssh, s->pktout); |
51470298 |
7080 | s->type = AUTH_TYPE_NONE; |
7081 | s->gotit = FALSE; |
7082 | s->we_are_in = FALSE; |
7083 | |
7084 | s->tried_pubkey_config = FALSE; |
6ac3a551 |
7085 | s->kbd_inter_refused = FALSE; |
65a22376 |
7086 | |
94cd7c3a |
7087 | /* Reset agent request state. */ |
7088 | s->done_agent = FALSE; |
7089 | if (s->agent_response) { |
7090 | if (s->pkblob_in_agent) { |
7091 | s->agentp = s->pkblob_in_agent; |
7092 | } else { |
7093 | s->agentp = s->agent_response + 5 + 4; |
7094 | s->keyi = 0; |
7095 | } |
7096 | } |
7097 | |
1408a877 |
7098 | while (1) { |
7099 | /* |
7100 | * Wait for the result of the last authentication request. |
7101 | */ |
51470298 |
7102 | if (!s->gotit) |
ff3187f6 |
7103 | crWaitUntilV(pktin); |
6bbce591 |
7104 | /* |
7105 | * Now is a convenient point to spew any banner material |
7106 | * that we've accumulated. (This should ensure that when |
7107 | * we exit the auth loop, we haven't any left to deal |
7108 | * with.) |
7109 | */ |
7110 | { |
7111 | int size = bufchain_size(&ssh->banner); |
32874aea |
7112 | /* |
7113 | * Don't show the banner if we're operating in |
7114 | * non-verbose non-interactive mode. (It's probably |
7115 | * a script, which means nobody will read the |
7116 | * banner _anyway_, and moreover the printing of |
7117 | * the banner will screw up processing on the |
7118 | * output of (say) plink.) |
7119 | */ |
6bbce591 |
7120 | if (size && (flags & (FLAG_VERBOSE | FLAG_INTERACTIVE))) { |
7121 | char *banner = snewn(size, char); |
7122 | bufchain_fetch(&ssh->banner, banner, size); |
7123 | c_write_untrusted(ssh, banner, size); |
7124 | sfree(banner); |
32874aea |
7125 | } |
6bbce591 |
7126 | bufchain_clear(&ssh->banner); |
1408a877 |
7127 | } |
ff3187f6 |
7128 | if (pktin->type == SSH2_MSG_USERAUTH_SUCCESS) { |
1408a877 |
7129 | logevent("Access granted"); |
51470298 |
7130 | s->we_are_in = TRUE; |
1408a877 |
7131 | break; |
7132 | } |
65a22376 |
7133 | |
e955d348 |
7134 | if (pktin->type != SSH2_MSG_USERAUTH_FAILURE) { |
7135 | bombout(("Strange packet received during authentication: " |
7136 | "type %d", pktin->type)); |
7ffdbc1a |
7137 | crStopV; |
65a22376 |
7138 | } |
7139 | |
51470298 |
7140 | s->gotit = FALSE; |
65a22376 |
7141 | |
1408a877 |
7142 | /* |
7143 | * OK, we're now sitting on a USERAUTH_FAILURE message, so |
7144 | * we can look at the string in it and know what we can |
7145 | * helpfully try next. |
7146 | */ |
ff3187f6 |
7147 | if (pktin->type == SSH2_MSG_USERAUTH_FAILURE) { |
1408a877 |
7148 | char *methods; |
7149 | int methlen; |
ff3187f6 |
7150 | ssh_pkt_getstring(pktin, &methods, &methlen); |
ff3187f6 |
7151 | if (!ssh2_pkt_getbool(pktin)) { |
1408a877 |
7152 | /* |
7153 | * We have received an unequivocal Access |
7154 | * Denied. This can translate to a variety of |
7155 | * messages: |
7156 | * |
7157 | * - if we'd just tried "none" authentication, |
7158 | * it's not worth printing anything at all |
7159 | * |
7160 | * - if we'd just tried a public key _offer_, |
7161 | * the message should be "Server refused our |
7162 | * key" (or no message at all if the key |
7163 | * came from Pageant) |
7164 | * |
7165 | * - if we'd just tried anything else, the |
7166 | * message really should be "Access denied". |
7167 | * |
7168 | * Additionally, if we'd just tried password |
7169 | * authentication, we should break out of this |
7170 | * whole loop so as to go back to the username |
91f57d1f |
7171 | * prompt (iff we're configured to allow |
7172 | * username change attempts). |
1408a877 |
7173 | */ |
51470298 |
7174 | if (s->type == AUTH_TYPE_NONE) { |
1408a877 |
7175 | /* do nothing */ |
51470298 |
7176 | } else if (s->type == AUTH_TYPE_PUBLICKEY_OFFER_LOUD || |
7177 | s->type == AUTH_TYPE_PUBLICKEY_OFFER_QUIET) { |
7178 | if (s->type == AUTH_TYPE_PUBLICKEY_OFFER_LOUD) |
7179 | c_write_str(ssh, "Server refused our key\r\n"); |
1408a877 |
7180 | logevent("Server refused public key"); |
51470298 |
7181 | } else if (s->type==AUTH_TYPE_KEYBOARD_INTERACTIVE_QUIET) { |
4bdf7c46 |
7182 | /* server declined keyboard-interactive; ignore */ |
1408a877 |
7183 | } else { |
51470298 |
7184 | c_write_str(ssh, "Access denied\r\n"); |
1408a877 |
7185 | logevent("Access denied"); |
91f57d1f |
7186 | if (s->type == AUTH_TYPE_PASSWORD && |
7187 | ssh->cfg.change_username) { |
6c9dce7c |
7188 | /* XXX perhaps we should allow |
7189 | * keyboard-interactive to do this too? */ |
51470298 |
7190 | s->we_are_in = FALSE; |
1408a877 |
7191 | break; |
7192 | } |
7193 | } |
7194 | } else { |
51470298 |
7195 | c_write_str(ssh, "Further authentication required\r\n"); |
1408a877 |
7196 | logevent("Further authentication required"); |
7197 | } |
65a22376 |
7198 | |
51470298 |
7199 | s->can_pubkey = |
32874aea |
7200 | in_commasep_string("publickey", methods, methlen); |
51470298 |
7201 | s->can_passwd = |
32874aea |
7202 | in_commasep_string("password", methods, methlen); |
86916870 |
7203 | s->can_keyb_inter = ssh->cfg.try_ki_auth && |
761187b6 |
7204 | in_commasep_string("keyboard-interactive", methods, methlen); |
1408a877 |
7205 | } |
65a22376 |
7206 | |
51470298 |
7207 | ssh->pkt_ctx &= ~SSH2_PKTCTX_AUTH_MASK; |
65a22376 |
7208 | |
94cd7c3a |
7209 | if (s->can_pubkey && !s->done_agent && s->nkeys) { |
0405e71f |
7210 | |
1983e559 |
7211 | /* |
94cd7c3a |
7212 | * Attempt public-key authentication using a key from Pageant. |
1983e559 |
7213 | */ |
1983e559 |
7214 | |
51470298 |
7215 | ssh->pkt_ctx &= ~SSH2_PKTCTX_AUTH_MASK; |
7216 | ssh->pkt_ctx |= SSH2_PKTCTX_PUBLICKEY; |
00db133f |
7217 | |
94cd7c3a |
7218 | logeventf(ssh, "Trying Pageant key #%d", s->keyi); |
7219 | |
7220 | /* Unpack key from agent response */ |
7221 | s->pklen = GET_32BIT(s->agentp); |
7222 | s->agentp += 4; |
7223 | s->pkblob = (char *)s->agentp; |
7224 | s->agentp += s->pklen; |
7225 | s->alglen = GET_32BIT(s->pkblob); |
7226 | s->alg = s->pkblob + 4; |
7227 | s->commentlen = GET_32BIT(s->agentp); |
7228 | s->agentp += 4; |
7229 | s->commentp = (char *)s->agentp; |
7230 | s->agentp += s->commentlen; |
7231 | /* s->agentp now points at next key, if any */ |
7232 | |
7233 | /* See if server will accept it */ |
7234 | s->pktout = ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST); |
7235 | ssh2_pkt_addstring(s->pktout, s->username); |
7236 | ssh2_pkt_addstring(s->pktout, "ssh-connection"); |
7237 | /* service requested */ |
7238 | ssh2_pkt_addstring(s->pktout, "publickey"); |
7239 | /* method */ |
7240 | ssh2_pkt_addbool(s->pktout, FALSE); /* no signature included */ |
7241 | ssh2_pkt_addstring_start(s->pktout); |
7242 | ssh2_pkt_addstring_data(s->pktout, s->alg, s->alglen); |
7243 | ssh2_pkt_addstring_start(s->pktout); |
7244 | ssh2_pkt_addstring_data(s->pktout, s->pkblob, s->pklen); |
7245 | ssh2_pkt_send(ssh, s->pktout); |
7246 | s->type = AUTH_TYPE_PUBLICKEY_OFFER_QUIET; |
1983e559 |
7247 | |
94cd7c3a |
7248 | crWaitUntilV(pktin); |
7249 | if (pktin->type != SSH2_MSG_USERAUTH_PK_OK) { |
1983e559 |
7250 | |
94cd7c3a |
7251 | /* Offer of key refused. */ |
7252 | s->gotit = TRUE; |
1983e559 |
7253 | |
94cd7c3a |
7254 | } else { |
7255 | |
7256 | void *vret; |
1983e559 |
7257 | |
94cd7c3a |
7258 | if (flags & FLAG_VERBOSE) { |
7259 | c_write_str(ssh, "Authenticating with " |
7260 | "public key \""); |
7261 | c_write(ssh, s->commentp, s->commentlen); |
7262 | c_write_str(ssh, "\" from agent\r\n"); |
7263 | } |
1983e559 |
7264 | |
94cd7c3a |
7265 | /* |
7266 | * Server is willing to accept the key. |
7267 | * Construct a SIGN_REQUEST. |
7268 | */ |
7269 | s->pktout = ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST); |
7270 | ssh2_pkt_addstring(s->pktout, s->username); |
7271 | ssh2_pkt_addstring(s->pktout, "ssh-connection"); |
7272 | /* service requested */ |
7273 | ssh2_pkt_addstring(s->pktout, "publickey"); |
7274 | /* method */ |
7275 | ssh2_pkt_addbool(s->pktout, TRUE); /* signature included */ |
7276 | ssh2_pkt_addstring_start(s->pktout); |
7277 | ssh2_pkt_addstring_data(s->pktout, s->alg, s->alglen); |
7278 | ssh2_pkt_addstring_start(s->pktout); |
7279 | ssh2_pkt_addstring_data(s->pktout, s->pkblob, s->pklen); |
7280 | |
7281 | /* Ask agent for signature. */ |
7282 | s->siglen = s->pktout->length - 5 + 4 + |
7283 | ssh->v2_session_id_len; |
7284 | if (ssh->remote_bugs & BUG_SSH2_PK_SESSIONID) |
7285 | s->siglen -= 4; |
7286 | s->len = 1; /* message type */ |
7287 | s->len += 4 + s->pklen; /* key blob */ |
7288 | s->len += 4 + s->siglen; /* data to sign */ |
7289 | s->len += 4; /* flags */ |
7290 | s->agentreq = snewn(4 + s->len, char); |
7291 | PUT_32BIT(s->agentreq, s->len); |
7292 | s->q = s->agentreq + 4; |
7293 | *s->q++ = SSH2_AGENTC_SIGN_REQUEST; |
7294 | PUT_32BIT(s->q, s->pklen); |
7295 | s->q += 4; |
7296 | memcpy(s->q, s->pkblob, s->pklen); |
7297 | s->q += s->pklen; |
7298 | PUT_32BIT(s->q, s->siglen); |
7299 | s->q += 4; |
7300 | /* Now the data to be signed... */ |
7301 | if (!(ssh->remote_bugs & BUG_SSH2_PK_SESSIONID)) { |
7302 | PUT_32BIT(s->q, ssh->v2_session_id_len); |
51470298 |
7303 | s->q += 4; |
94cd7c3a |
7304 | } |
7305 | memcpy(s->q, ssh->v2_session_id, |
7306 | ssh->v2_session_id_len); |
7307 | s->q += ssh->v2_session_id_len; |
7308 | memcpy(s->q, s->pktout->data + 5, |
7309 | s->pktout->length - 5); |
7310 | s->q += s->pktout->length - 5; |
7311 | /* And finally the (zero) flags word. */ |
7312 | PUT_32BIT(s->q, 0); |
7313 | if (!agent_query(s->agentreq, s->len + 4, |
7314 | &vret, &s->retlen, |
7315 | ssh_agent_callback, ssh)) { |
7316 | do { |
7317 | crReturnV; |
7318 | if (pktin) { |
7319 | bombout(("Unexpected data from server" |
7320 | " while waiting for agent" |
7321 | " response")); |
7322 | crStopV; |
1983e559 |
7323 | } |
94cd7c3a |
7324 | } while (pktin || inlen > 0); |
7325 | vret = ssh->agent_response; |
7326 | s->retlen = ssh->agent_response_len; |
7327 | } |
7328 | s->ret = vret; |
7329 | sfree(s->agentreq); |
7330 | if (s->ret) { |
7331 | if (s->ret[4] == SSH2_AGENT_SIGN_RESPONSE) { |
7332 | logevent("Sending Pageant's response"); |
7333 | ssh2_add_sigblob(ssh, s->pktout, |
7334 | s->pkblob, s->pklen, |
7335 | s->ret + 9, |
7336 | GET_32BIT(s->ret + 5)); |
7337 | ssh2_pkt_send(ssh, s->pktout); |
7338 | s->type = AUTH_TYPE_PUBLICKEY; |
7339 | } else { |
7340 | /* FIXME: less drastic response */ |
7341 | bombout(("Pageant failed to answer challenge")); |
7342 | crStopV; |
1983e559 |
7343 | } |
7344 | } |
1983e559 |
7345 | } |
94cd7c3a |
7346 | |
7347 | /* Do we have any keys left to try? */ |
7348 | if (s->pkblob_in_agent) { |
7349 | s->done_agent = TRUE; |
7350 | s->tried_pubkey_config = TRUE; |
7351 | } else { |
7352 | s->keyi++; |
7353 | if (s->keyi >= s->nkeys) |
7354 | s->done_agent = TRUE; |
7355 | } |
1983e559 |
7356 | |
edd0cb8a |
7357 | } else if (s->can_pubkey && s->publickey_blob && |
7358 | !s->tried_pubkey_config) { |
65a22376 |
7359 | |
edd0cb8a |
7360 | struct ssh2_userkey *key; /* not live over crReturn */ |
7361 | char *passphrase; /* not live over crReturn */ |
65a22376 |
7362 | |
51470298 |
7363 | ssh->pkt_ctx &= ~SSH2_PKTCTX_AUTH_MASK; |
7364 | ssh->pkt_ctx |= SSH2_PKTCTX_PUBLICKEY; |
00db133f |
7365 | |
edd0cb8a |
7366 | s->tried_pubkey_config = TRUE; |
7367 | |
65a22376 |
7368 | /* |
1408a877 |
7369 | * Try the public key supplied in the configuration. |
7370 | * |
7371 | * First, offer the public blob to see if the server is |
7372 | * willing to accept it. |
65a22376 |
7373 | */ |
ff3187f6 |
7374 | s->pktout = ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST); |
7375 | ssh2_pkt_addstring(s->pktout, s->username); |
edd0cb8a |
7376 | ssh2_pkt_addstring(s->pktout, "ssh-connection"); |
7377 | /* service requested */ |
7378 | ssh2_pkt_addstring(s->pktout, "publickey"); /* method */ |
7379 | ssh2_pkt_addbool(s->pktout, FALSE); |
7380 | /* no signature included */ |
7381 | ssh2_pkt_addstring(s->pktout, s->publickey_algorithm); |
7382 | ssh2_pkt_addstring_start(s->pktout); |
7383 | ssh2_pkt_addstring_data(s->pktout, |
7384 | (char *)s->publickey_blob, |
7385 | s->publickey_bloblen); |
ff3187f6 |
7386 | ssh2_pkt_send(ssh, s->pktout); |
edd0cb8a |
7387 | logevent("Offered public key"); |
ff3187f6 |
7388 | |
7389 | crWaitUntilV(pktin); |
edd0cb8a |
7390 | if (pktin->type != SSH2_MSG_USERAUTH_PK_OK) { |
7391 | /* Key refused. Give up. */ |
7392 | s->gotit = TRUE; /* reconsider message next loop */ |
7393 | s->type = AUTH_TYPE_PUBLICKEY_OFFER_LOUD; |
7394 | continue; /* process this new message */ |
45068b27 |
7395 | } |
edd0cb8a |
7396 | logevent("Offer of public key accepted"); |
af659722 |
7397 | |
45068b27 |
7398 | /* |
edd0cb8a |
7399 | * Actually attempt a serious authentication using |
7400 | * the key. |
45068b27 |
7401 | */ |
edd0cb8a |
7402 | if (flags & FLAG_VERBOSE) { |
7403 | c_write_str(ssh, "Authenticating with public key \""); |
7404 | c_write_str(ssh, s->publickey_comment); |
7405 | c_write_str(ssh, "\"\r\n"); |
7406 | } |
7407 | key = NULL; |
7408 | while (!key) { |
7409 | const char *error; /* not live over crReturn */ |
7410 | if (s->publickey_encrypted) { |
7411 | /* |
7412 | * Get a passphrase from the user. |
7413 | */ |
7414 | int ret; /* need not be kept over crReturn */ |
7415 | s->cur_prompt = new_prompts(ssh->frontend); |
7416 | s->cur_prompt->to_server = FALSE; |
7417 | s->cur_prompt->name = dupstr("SSH key passphrase"); |
7418 | add_prompt(s->cur_prompt, |
7419 | dupprintf("Passphrase for key \"%.100s\": ", |
7420 | s->publickey_comment), |
7421 | FALSE, SSH_MAX_PASSWORD_LEN); |
7422 | ret = get_userpass_input(s->cur_prompt, NULL, 0); |
7423 | while (ret < 0) { |
7424 | ssh->send_ok = 1; |
7425 | crWaitUntilV(!pktin); |
7426 | ret = get_userpass_input(s->cur_prompt, |
7427 | in, inlen); |
7428 | ssh->send_ok = 0; |
7429 | } |
7430 | if (!ret) { |
7431 | /* Failed to get a passphrase. Terminate. */ |
7432 | free_prompts(s->cur_prompt); |
7433 | ssh_disconnect(ssh, NULL, |
7434 | "Unable to authenticate", |
7435 | SSH2_DISCONNECT_AUTH_CANCELLED_BY_USER, |
7436 | TRUE); |
7437 | crStopV; |
85fdbe25 |
7438 | } |
edd0cb8a |
7439 | passphrase = |
7440 | dupstr(s->cur_prompt->prompts[0]->result); |
7441 | free_prompts(s->cur_prompt); |
45068b27 |
7442 | } else { |
edd0cb8a |
7443 | passphrase = NULL; /* no passphrase needed */ |
45068b27 |
7444 | } |
1408a877 |
7445 | |
edd0cb8a |
7446 | /* |
7447 | * Try decrypting the key. |
7448 | */ |
7449 | key = ssh2_load_userkey(&ssh->cfg.keyfile, passphrase, |
7450 | &error); |
7451 | if (passphrase) { |
7452 | /* burn the evidence */ |
7453 | memset(passphrase, 0, strlen(passphrase)); |
7454 | sfree(passphrase); |
7455 | } |
7456 | if (key == SSH2_WRONG_PASSPHRASE || key == NULL) { |
7457 | if (passphrase && |
7458 | (key == SSH2_WRONG_PASSPHRASE)) { |
7459 | c_write_str(ssh, "Wrong passphrase\r\n"); |
7460 | key = NULL; |
7461 | /* and loop again */ |
7462 | } else { |
7463 | c_write_str(ssh, "Unable to load private key ("); |
7464 | c_write_str(ssh, error); |
7465 | c_write_str(ssh, ")\r\n"); |
7466 | key = NULL; |
7467 | break; /* try something else */ |
7468 | } |
1408a877 |
7469 | } |
65a22376 |
7470 | } |
65a22376 |
7471 | |
edd0cb8a |
7472 | if (key) { |
1dd353b5 |
7473 | unsigned char *pkblob, *sigblob, *sigdata; |
7474 | int pkblob_len, sigblob_len, sigdata_len; |
edd0cb8a |
7475 | int p; |
65a22376 |
7476 | |
1408a877 |
7477 | /* |
7478 | * We have loaded the private key and the server |
7479 | * has announced that it's willing to accept it. |
7480 | * Hallelujah. Generate a signature and send it. |
7481 | */ |
ff3187f6 |
7482 | s->pktout = ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST); |
7483 | ssh2_pkt_addstring(s->pktout, s->username); |
edd0cb8a |
7484 | ssh2_pkt_addstring(s->pktout, "ssh-connection"); |
7485 | /* service requested */ |
7486 | ssh2_pkt_addstring(s->pktout, "publickey"); |
7487 | /* method */ |
ff3187f6 |
7488 | ssh2_pkt_addbool(s->pktout, TRUE); |
edd0cb8a |
7489 | /* signature follows */ |
ff3187f6 |
7490 | ssh2_pkt_addstring(s->pktout, key->alg->name); |
edd0cb8a |
7491 | pkblob = key->alg->public_blob(key->data, |
7492 | &pkblob_len); |
ff3187f6 |
7493 | ssh2_pkt_addstring_start(s->pktout); |
edd0cb8a |
7494 | ssh2_pkt_addstring_data(s->pktout, (char *)pkblob, |
7495 | pkblob_len); |
1408a877 |
7496 | |
7497 | /* |
7498 | * The data to be signed is: |
7499 | * |
7500 | * string session-id |
7501 | * |
7502 | * followed by everything so far placed in the |
7503 | * outgoing packet. |
7504 | */ |
b672f405 |
7505 | sigdata_len = s->pktout->length - 5 + 4 + |
7506 | ssh->v2_session_id_len; |
edd0cb8a |
7507 | if (ssh->remote_bugs & BUG_SSH2_PK_SESSIONID) |
7508 | sigdata_len -= 4; |
92d60585 |
7509 | sigdata = snewn(sigdata_len, unsigned char); |
edd0cb8a |
7510 | p = 0; |
7511 | if (!(ssh->remote_bugs & BUG_SSH2_PK_SESSIONID)) { |
7512 | PUT_32BIT(sigdata+p, ssh->v2_session_id_len); |
7513 | p += 4; |
7514 | } |
b672f405 |
7515 | memcpy(sigdata+p, ssh->v2_session_id, |
7516 | ssh->v2_session_id_len); |
7517 | p += ssh->v2_session_id_len; |
ff3187f6 |
7518 | memcpy(sigdata+p, s->pktout->data + 5, |
7519 | s->pktout->length - 5); |
edd0cb8a |
7520 | p += s->pktout->length - 5; |
7521 | assert(p == sigdata_len); |
d8baa528 |
7522 | sigblob = key->alg->sign(key->data, (char *)sigdata, |
1dd353b5 |
7523 | sigdata_len, &sigblob_len); |
ff3187f6 |
7524 | ssh2_add_sigblob(ssh, s->pktout, pkblob, pkblob_len, |
1dd353b5 |
7525 | sigblob, sigblob_len); |
7526 | sfree(pkblob); |
7527 | sfree(sigblob); |
1408a877 |
7528 | sfree(sigdata); |
7529 | |
ff3187f6 |
7530 | ssh2_pkt_send(ssh, s->pktout); |
51470298 |
7531 | s->type = AUTH_TYPE_PUBLICKEY; |
75374b2f |
7532 | key->alg->freekey(key->data); |
1408a877 |
7533 | } |
edd0cb8a |
7534 | |
7535 | } else if (s->can_keyb_inter && !s->kbd_inter_refused) { |
7536 | |
7537 | /* |
7538 | * Keyboard-interactive authentication. |
7539 | */ |
edd0cb8a |
7540 | |
edd0cb8a |
7541 | s->type = AUTH_TYPE_KEYBOARD_INTERACTIVE; |
7542 | |
7543 | ssh->pkt_ctx &= ~SSH2_PKTCTX_AUTH_MASK; |
7544 | ssh->pkt_ctx |= SSH2_PKTCTX_KBDINTER; |
7545 | |
7546 | s->pktout = ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST); |
7547 | ssh2_pkt_addstring(s->pktout, s->username); |
7548 | ssh2_pkt_addstring(s->pktout, "ssh-connection"); |
7549 | /* service requested */ |
7550 | ssh2_pkt_addstring(s->pktout, "keyboard-interactive"); |
7551 | /* method */ |
7552 | ssh2_pkt_addstring(s->pktout, ""); /* lang */ |
7553 | ssh2_pkt_addstring(s->pktout, ""); /* submethods */ |
7554 | ssh2_pkt_send(ssh, s->pktout); |
7555 | |
7556 | crWaitUntilV(pktin); |
7557 | if (pktin->type != SSH2_MSG_USERAUTH_INFO_REQUEST) { |
7558 | /* Server is not willing to do keyboard-interactive |
b8e3173d |
7559 | * at all (or, bizarrely but legally, accepts the |
7560 | * user without actually issuing any prompts). |
7561 | * Give up on it entirely. */ |
edd0cb8a |
7562 | s->gotit = TRUE; |
7563 | if (pktin->type == SSH2_MSG_USERAUTH_FAILURE) |
7564 | logevent("Keyboard-interactive authentication refused"); |
7565 | s->type = AUTH_TYPE_KEYBOARD_INTERACTIVE_QUIET; |
7566 | s->kbd_inter_refused = TRUE; /* don't try it again */ |
7567 | continue; |
7568 | } |
7569 | |
7570 | /* |
b8e3173d |
7571 | * Loop while the server continues to send INFO_REQUESTs. |
edd0cb8a |
7572 | */ |
b8e3173d |
7573 | while (pktin->type == SSH2_MSG_USERAUTH_INFO_REQUEST) { |
edd0cb8a |
7574 | |
b8e3173d |
7575 | char *name, *inst, *lang; |
7576 | int name_len, inst_len, lang_len; |
7577 | int i; |
7578 | |
7579 | /* |
7580 | * We've got a fresh USERAUTH_INFO_REQUEST. |
7581 | * Get the preamble and start building a prompt. |
7582 | */ |
7583 | ssh_pkt_getstring(pktin, &name, &name_len); |
7584 | ssh_pkt_getstring(pktin, &inst, &inst_len); |
7585 | ssh_pkt_getstring(pktin, &lang, &lang_len); |
7586 | s->cur_prompt = new_prompts(ssh->frontend); |
7587 | s->cur_prompt->to_server = TRUE; |
7588 | if (name_len) { |
7589 | /* FIXME: better prefix to distinguish from |
7590 | * local prompts? */ |
7591 | s->cur_prompt->name = |
7592 | dupprintf("SSH server: %.*s", name_len, name); |
7593 | s->cur_prompt->name_reqd = TRUE; |
7594 | } else { |
7595 | s->cur_prompt->name = |
7596 | dupstr("SSH server authentication"); |
7597 | s->cur_prompt->name_reqd = FALSE; |
edd0cb8a |
7598 | } |
b8e3173d |
7599 | /* FIXME: ugly to print "Using..." in prompt _every_ |
7600 | * time round. Can this be done more subtly? */ |
7601 | s->cur_prompt->instruction = |
7602 | dupprintf("Using keyboard-interactive authentication.%s%.*s", |
7603 | inst_len ? "\n" : "", inst_len, inst); |
7604 | s->cur_prompt->instr_reqd = TRUE; |
edd0cb8a |
7605 | |
b8e3173d |
7606 | /* |
7607 | * Get the prompts from the packet. |
7608 | */ |
7609 | s->num_prompts = ssh_pkt_getuint32(pktin); |
7610 | for (i = 0; i < s->num_prompts; i++) { |
7611 | char *prompt; |
7612 | int prompt_len; |
7613 | int echo; |
7614 | static char noprompt[] = |
7615 | "<server failed to send prompt>: "; |
7616 | |
7617 | ssh_pkt_getstring(pktin, &prompt, &prompt_len); |
7618 | echo = ssh2_pkt_getbool(pktin); |
7619 | if (!prompt_len) { |
7620 | prompt = noprompt; |
7621 | prompt_len = lenof(noprompt)-1; |
7622 | } |
7623 | add_prompt(s->cur_prompt, |
7624 | dupprintf("%.*s", prompt_len, prompt), |
7625 | echo, SSH_MAX_PASSWORD_LEN); |
edd0cb8a |
7626 | } |
b8e3173d |
7627 | |
7628 | /* |
7629 | * Get the user's responses. |
7630 | */ |
7631 | if (s->num_prompts) { |
7632 | int ret; /* not live over crReturn */ |
7633 | ret = get_userpass_input(s->cur_prompt, NULL, 0); |
7634 | while (ret < 0) { |
7635 | ssh->send_ok = 1; |
7636 | crWaitUntilV(!pktin); |
7637 | ret = get_userpass_input(s->cur_prompt, in, inlen); |
7638 | ssh->send_ok = 0; |
7639 | } |
7640 | if (!ret) { |
7641 | /* |
7642 | * Failed to get responses. Terminate. |
7643 | */ |
7644 | free_prompts(s->cur_prompt); |
7645 | ssh_disconnect(ssh, NULL, "Unable to authenticate", |
7646 | SSH2_DISCONNECT_AUTH_CANCELLED_BY_USER, |
7647 | TRUE); |
7648 | crStopV; |
7649 | } |
edd0cb8a |
7650 | } |
b8e3173d |
7651 | |
7652 | /* |
7653 | * Send the responses to the server. |
7654 | */ |
7655 | s->pktout = ssh2_pkt_init(SSH2_MSG_USERAUTH_INFO_RESPONSE); |
b8e3173d |
7656 | ssh2_pkt_adduint32(s->pktout, s->num_prompts); |
7657 | for (i=0; i < s->num_prompts; i++) { |
7658 | dont_log_password(ssh, s->pktout, PKTLOG_BLANK); |
7659 | ssh2_pkt_addstring(s->pktout, |
7660 | s->cur_prompt->prompts[i]->result); |
7661 | end_log_omission(ssh, s->pktout); |
7662 | } |
18524056 |
7663 | ssh2_pkt_send_with_padding(ssh, s->pktout, 256); |
b8e3173d |
7664 | |
7665 | /* |
7666 | * Get the next packet in case it's another |
7667 | * INFO_REQUEST. |
7668 | */ |
7669 | crWaitUntilV(pktin); |
7670 | |
edd0cb8a |
7671 | } |
7672 | |
7673 | /* |
b8e3173d |
7674 | * We should have SUCCESS or FAILURE now. |
edd0cb8a |
7675 | */ |
b8e3173d |
7676 | s->gotit = TRUE; |
edd0cb8a |
7677 | |
7678 | } else if (s->can_passwd) { |
7679 | |
7680 | /* |
7681 | * Plain old password authentication. |
7682 | */ |
7683 | int ret; /* not live over crReturn */ |
e955d348 |
7684 | int changereq_first_time; /* not live over crReturn */ |
edd0cb8a |
7685 | |
edd0cb8a |
7686 | ssh->pkt_ctx &= ~SSH2_PKTCTX_AUTH_MASK; |
7687 | ssh->pkt_ctx |= SSH2_PKTCTX_PASSWORD; |
7688 | |
7689 | s->cur_prompt = new_prompts(ssh->frontend); |
7690 | s->cur_prompt->to_server = TRUE; |
7691 | s->cur_prompt->name = dupstr("SSH password"); |
7692 | add_prompt(s->cur_prompt, dupprintf("%.90s@%.90s's password: ", |
7693 | s->username, |
7694 | ssh->savedhost), |
7695 | FALSE, SSH_MAX_PASSWORD_LEN); |
7696 | |
7697 | ret = get_userpass_input(s->cur_prompt, NULL, 0); |
7698 | while (ret < 0) { |
7699 | ssh->send_ok = 1; |
7700 | crWaitUntilV(!pktin); |
7701 | ret = get_userpass_input(s->cur_prompt, in, inlen); |
7702 | ssh->send_ok = 0; |
7703 | } |
7704 | if (!ret) { |
7705 | /* |
7706 | * Failed to get responses. Terminate. |
7707 | */ |
7708 | free_prompts(s->cur_prompt); |
7709 | ssh_disconnect(ssh, NULL, "Unable to authenticate", |
7710 | SSH2_DISCONNECT_AUTH_CANCELLED_BY_USER, |
7711 | TRUE); |
7712 | crStopV; |
7713 | } |
e955d348 |
7714 | /* |
7715 | * Squirrel away the password. (We may need it later if |
7716 | * asked to change it.) |
7717 | */ |
7718 | s->password = dupstr(s->cur_prompt->prompts[0]->result); |
7719 | free_prompts(s->cur_prompt); |
edd0cb8a |
7720 | |
7721 | /* |
7722 | * Send the password packet. |
7723 | * |
95d2d262 |
7724 | * We pad out the password packet to 256 bytes to make |
7725 | * it harder for an attacker to find the length of the |
7726 | * user's password. |
1408a877 |
7727 | * |
95d2d262 |
7728 | * Anyone using a password longer than 256 bytes |
7729 | * probably doesn't have much to worry about from |
1408a877 |
7730 | * people who find out how long their password is! |
65a22376 |
7731 | */ |
ff3187f6 |
7732 | s->pktout = ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST); |
7733 | ssh2_pkt_addstring(s->pktout, s->username); |
edd0cb8a |
7734 | ssh2_pkt_addstring(s->pktout, "ssh-connection"); |
7735 | /* service requested */ |
ff3187f6 |
7736 | ssh2_pkt_addstring(s->pktout, "password"); |
7737 | ssh2_pkt_addbool(s->pktout, FALSE); |
7738 | dont_log_password(ssh, s->pktout, PKTLOG_BLANK); |
e955d348 |
7739 | ssh2_pkt_addstring(s->pktout, s->password); |
ff3187f6 |
7740 | end_log_omission(ssh, s->pktout); |
18524056 |
7741 | ssh2_pkt_send_with_padding(ssh, s->pktout, 256); |
0d43337a |
7742 | logevent("Sent password"); |
28f4d4f0 |
7743 | s->type = AUTH_TYPE_PASSWORD; |
edd0cb8a |
7744 | |
e955d348 |
7745 | /* |
7746 | * Wait for next packet, in case it's a password change |
7747 | * request. |
7748 | */ |
7749 | crWaitUntilV(pktin); |
7750 | changereq_first_time = TRUE; |
7751 | |
7752 | while (pktin->type == SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ) { |
7753 | |
7754 | /* |
7755 | * We're being asked for a new password |
7756 | * (perhaps not for the first time). |
7757 | * Loop until the server accepts it. |
7758 | */ |
7759 | |
7760 | int got_new = FALSE; /* not live over crReturn */ |
7761 | char *prompt; /* not live over crReturn */ |
7762 | int prompt_len; /* not live over crReturn */ |
7763 | |
7764 | { |
7765 | char *msg; |
7766 | if (changereq_first_time) |
7767 | msg = "Server requested password change"; |
7768 | else |
7769 | msg = "Server rejected new password"; |
7770 | logevent(msg); |
7771 | c_write_str(ssh, msg); |
7772 | c_write_str(ssh, "\r\n"); |
7773 | } |
7774 | |
7775 | ssh_pkt_getstring(pktin, &prompt, &prompt_len); |
7776 | |
7777 | s->cur_prompt = new_prompts(ssh->frontend); |
7778 | s->cur_prompt->to_server = TRUE; |
7779 | s->cur_prompt->name = dupstr("New SSH password"); |
7780 | s->cur_prompt->instruction = |
7781 | dupprintf("%.*s", prompt_len, prompt); |
7782 | s->cur_prompt->instr_reqd = TRUE; |
d9add7bc |
7783 | /* |
7784 | * There's no explicit requirement in the protocol |
7785 | * for the "old" passwords in the original and |
7786 | * password-change messages to be the same, and |
7787 | * apparently some Cisco kit supports password change |
7788 | * by the user entering a blank password originally |
7789 | * and the real password subsequently, so, |
7790 | * reluctantly, we prompt for the old password again. |
7791 | * |
7792 | * (On the other hand, some servers don't even bother |
7793 | * to check this field.) |
7794 | */ |
7795 | add_prompt(s->cur_prompt, |
7796 | dupstr("Current password (blank for previously entered password): "), |
7797 | FALSE, SSH_MAX_PASSWORD_LEN); |
e955d348 |
7798 | add_prompt(s->cur_prompt, dupstr("Enter new password: "), |
7799 | FALSE, SSH_MAX_PASSWORD_LEN); |
7800 | add_prompt(s->cur_prompt, dupstr("Confirm new password: "), |
7801 | FALSE, SSH_MAX_PASSWORD_LEN); |
7802 | |
7803 | /* |
7804 | * Loop until the user manages to enter the same |
7805 | * password twice. |
7806 | */ |
7807 | while (!got_new) { |
7808 | |
7809 | ret = get_userpass_input(s->cur_prompt, NULL, 0); |
7810 | while (ret < 0) { |
7811 | ssh->send_ok = 1; |
7812 | crWaitUntilV(!pktin); |
7813 | ret = get_userpass_input(s->cur_prompt, in, inlen); |
7814 | ssh->send_ok = 0; |
7815 | } |
7816 | if (!ret) { |
7817 | /* |
7818 | * Failed to get responses. Terminate. |
7819 | */ |
7820 | /* burn the evidence */ |
7821 | free_prompts(s->cur_prompt); |
7822 | memset(s->password, 0, strlen(s->password)); |
7823 | sfree(s->password); |
7824 | ssh_disconnect(ssh, NULL, "Unable to authenticate", |
7825 | SSH2_DISCONNECT_AUTH_CANCELLED_BY_USER, |
7826 | TRUE); |
7827 | crStopV; |
7828 | } |
7829 | |
7830 | /* |
d9add7bc |
7831 | * If the user specified a new original password |
7832 | * (IYSWIM), overwrite any previously specified |
7833 | * one. |
7834 | * (A side effect is that the user doesn't have to |
7835 | * re-enter it if they louse up the new password.) |
7836 | */ |
7837 | if (s->cur_prompt->prompts[0]->result[0]) { |
7838 | memset(s->password, 0, strlen(s->password)); |
7839 | /* burn the evidence */ |
7840 | sfree(s->password); |
7841 | s->password = |
7842 | dupstr(s->cur_prompt->prompts[0]->result); |
7843 | } |
7844 | |
7845 | /* |
7846 | * Check the two new passwords match. |
e955d348 |
7847 | */ |
d9add7bc |
7848 | got_new = (strcmp(s->cur_prompt->prompts[1]->result, |
7849 | s->cur_prompt->prompts[2]->result) |
e955d348 |
7850 | == 0); |
7851 | if (!got_new) |
7852 | /* They don't. Silly user. */ |
7853 | c_write_str(ssh, "Passwords do not match\r\n"); |
7854 | |
7855 | } |
7856 | |
7857 | /* |
7858 | * Send the new password (along with the old one). |
7859 | * (see above for padding rationale) |
7860 | */ |
7861 | s->pktout = ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST); |
e955d348 |
7862 | ssh2_pkt_addstring(s->pktout, s->username); |
7863 | ssh2_pkt_addstring(s->pktout, "ssh-connection"); |
7864 | /* service requested */ |
7865 | ssh2_pkt_addstring(s->pktout, "password"); |
7866 | ssh2_pkt_addbool(s->pktout, TRUE); |
7867 | dont_log_password(ssh, s->pktout, PKTLOG_BLANK); |
7868 | ssh2_pkt_addstring(s->pktout, s->password); |
7869 | ssh2_pkt_addstring(s->pktout, |
d9add7bc |
7870 | s->cur_prompt->prompts[1]->result); |
e955d348 |
7871 | free_prompts(s->cur_prompt); |
7872 | end_log_omission(ssh, s->pktout); |
18524056 |
7873 | ssh2_pkt_send_with_padding(ssh, s->pktout, 256); |
e955d348 |
7874 | logevent("Sent new password"); |
7875 | |
7876 | /* |
7877 | * Now see what the server has to say about it. |
7878 | * (If it's CHANGEREQ again, it's not happy with the |
7879 | * new password.) |
7880 | */ |
7881 | crWaitUntilV(pktin); |
7882 | changereq_first_time = FALSE; |
7883 | |
7884 | } |
7885 | |
7886 | /* |
7887 | * We need to reexamine the current pktin at the top |
7888 | * of the loop. Either: |
7889 | * - we weren't asked to change password at all, in |
7890 | * which case it's a SUCCESS or FAILURE with the |
7891 | * usual meaning |
7892 | * - we sent a new password, and the server was |
7893 | * either OK with it (SUCCESS or FAILURE w/partial |
7894 | * success) or unhappy with the _old_ password |
7895 | * (FAILURE w/o partial success) |
7896 | * In any of these cases, we go back to the top of |
7897 | * the loop and start again. |
7898 | */ |
7899 | s->gotit = TRUE; |
7900 | |
7901 | /* |
7902 | * We don't need the old password any more, in any |
7903 | * case. Burn the evidence. |
7904 | */ |
7905 | memset(s->password, 0, strlen(s->password)); |
7906 | sfree(s->password); |
7907 | |
1408a877 |
7908 | } else { |
edd0cb8a |
7909 | |
9e296bfa |
7910 | ssh_disconnect(ssh, NULL, |
7911 | "No supported authentication methods available", |
7912 | SSH2_DISCONNECT_NO_MORE_AUTH_METHODS_AVAILABLE, |
7913 | FALSE); |
7ffdbc1a |
7914 | crStopV; |
edd0cb8a |
7915 | |
65a22376 |
7916 | } |
edd0cb8a |
7917 | |
65a22376 |
7918 | } |
a1a1fae4 |
7919 | } |
6bbce591 |
7920 | ssh->packet_dispatch[SSH2_MSG_USERAUTH_BANNER] = NULL; |
7cca0d81 |
7921 | |
edd0cb8a |
7922 | /* Clear up various bits and pieces from authentication. */ |
7923 | if (s->publickey_blob) { |
7924 | sfree(s->publickey_blob); |
7925 | sfree(s->publickey_comment); |
7926 | } |
94cd7c3a |
7927 | if (s->agent_response) |
7928 | sfree(s->agent_response); |
edd0cb8a |
7929 | |
7cca0d81 |
7930 | /* |
a1a1fae4 |
7931 | * Now the connection protocol has started, one way or another. |
7cca0d81 |
7932 | */ |
7933 | |
0ed48730 |
7934 | ssh->channels = newtree234(ssh_channelcmp); |
7935 | |
7cca0d81 |
7936 | /* |
b09eaa88 |
7937 | * Set up handlers for some connection protocol messages, so we |
7938 | * don't have to handle them repeatedly in this coroutine. |
7939 | */ |
7940 | ssh->packet_dispatch[SSH2_MSG_CHANNEL_WINDOW_ADJUST] = |
7941 | ssh2_msg_channel_window_adjust; |
51df0ab5 |
7942 | ssh->packet_dispatch[SSH2_MSG_GLOBAL_REQUEST] = |
7943 | ssh2_msg_global_request; |
b09eaa88 |
7944 | |
7945 | /* |
0ed48730 |
7946 | * Create the main session channel. |
7cca0d81 |
7947 | */ |
feb02b4e |
7948 | if (ssh->cfg.ssh_no_shell) { |
7949 | ssh->mainchan = NULL; |
7950 | } else if (*ssh->cfg.ssh_nc_host) { |
7951 | /* |
7952 | * Just start a direct-tcpip channel and use it as the main |
7953 | * channel. |
7954 | */ |
7955 | ssh->mainchan = snew(struct ssh_channel); |
7956 | ssh->mainchan->ssh = ssh; |
7957 | ssh->mainchan->localid = alloc_channel_id(ssh); |
23828b7e |
7958 | logeventf(ssh, |
7959 | "Opening direct-tcpip channel to %s:%d in place of session", |
7960 | ssh->cfg.ssh_nc_host, ssh->cfg.ssh_nc_port); |
feb02b4e |
7961 | s->pktout = ssh2_pkt_init(SSH2_MSG_CHANNEL_OPEN); |
7962 | ssh2_pkt_addstring(s->pktout, "direct-tcpip"); |
7963 | ssh2_pkt_adduint32(s->pktout, ssh->mainchan->localid); |
7964 | ssh->mainchan->v.v2.locwindow = OUR_V2_WINSIZE; |
7965 | ssh2_pkt_adduint32(s->pktout, ssh->mainchan->v.v2.locwindow);/* our window size */ |
7966 | ssh2_pkt_adduint32(s->pktout, OUR_V2_MAXPKT); /* our max pkt size */ |
7967 | ssh2_pkt_addstring(s->pktout, ssh->cfg.ssh_nc_host); |
7968 | ssh2_pkt_adduint32(s->pktout, ssh->cfg.ssh_nc_port); |
7969 | /* |
23828b7e |
7970 | * There's nothing meaningful to put in the originator |
7971 | * fields, but some servers insist on syntactically correct |
7972 | * information. |
feb02b4e |
7973 | */ |
7974 | ssh2_pkt_addstring(s->pktout, "0.0.0.0"); |
7975 | ssh2_pkt_adduint32(s->pktout, 0); |
7976 | ssh2_pkt_send(ssh, s->pktout); |
7977 | |
7978 | crWaitUntilV(pktin); |
7979 | if (pktin->type != SSH2_MSG_CHANNEL_OPEN_CONFIRMATION) { |
7980 | bombout(("Server refused to open a direct-tcpip channel")); |
7981 | crStopV; |
7982 | /* FIXME: error data comes back in FAILURE packet */ |
7983 | } |
7984 | if (ssh_pkt_getuint32(pktin) != ssh->mainchan->localid) { |
7985 | bombout(("Server's channel confirmation cited wrong channel")); |
7986 | crStopV; |
7987 | } |
7988 | ssh->mainchan->remoteid = ssh_pkt_getuint32(pktin); |
7989 | ssh->mainchan->halfopen = FALSE; |
7990 | ssh->mainchan->type = CHAN_MAINSESSION; |
7991 | ssh->mainchan->closes = 0; |
7992 | ssh->mainchan->v.v2.remwindow = ssh_pkt_getuint32(pktin); |
7993 | ssh->mainchan->v.v2.remmaxpkt = ssh_pkt_getuint32(pktin); |
7994 | bufchain_init(&ssh->mainchan->v.v2.outbuffer); |
7995 | add234(ssh->channels, ssh->mainchan); |
7996 | update_specials_menu(ssh->frontend); |
23828b7e |
7997 | logevent("Opened direct-tcpip channel"); |
feb02b4e |
7998 | ssh->ncmode = TRUE; |
7999 | } else { |
0ed48730 |
8000 | ssh->mainchan = snew(struct ssh_channel); |
8001 | ssh->mainchan->ssh = ssh; |
8002 | ssh->mainchan->localid = alloc_channel_id(ssh); |
ff3187f6 |
8003 | s->pktout = ssh2_pkt_init(SSH2_MSG_CHANNEL_OPEN); |
8004 | ssh2_pkt_addstring(s->pktout, "session"); |
8005 | ssh2_pkt_adduint32(s->pktout, ssh->mainchan->localid); |
0ed48730 |
8006 | ssh->mainchan->v.v2.locwindow = OUR_V2_WINSIZE; |
ff3187f6 |
8007 | ssh2_pkt_adduint32(s->pktout, ssh->mainchan->v.v2.locwindow);/* our window size */ |
954d5c5a |
8008 | ssh2_pkt_adduint32(s->pktout, OUR_V2_MAXPKT); /* our max pkt size */ |
ff3187f6 |
8009 | ssh2_pkt_send(ssh, s->pktout); |
8010 | crWaitUntilV(pktin); |
8011 | if (pktin->type != SSH2_MSG_CHANNEL_OPEN_CONFIRMATION) { |
0ed48730 |
8012 | bombout(("Server refused to open a session")); |
8013 | crStopV; |
8014 | /* FIXME: error data comes back in FAILURE packet */ |
8015 | } |
ff3187f6 |
8016 | if (ssh_pkt_getuint32(pktin) != ssh->mainchan->localid) { |
0ed48730 |
8017 | bombout(("Server's channel confirmation cited wrong channel")); |
8018 | crStopV; |
8019 | } |
ff3187f6 |
8020 | ssh->mainchan->remoteid = ssh_pkt_getuint32(pktin); |
64d6ff88 |
8021 | ssh->mainchan->halfopen = FALSE; |
0ed48730 |
8022 | ssh->mainchan->type = CHAN_MAINSESSION; |
8023 | ssh->mainchan->closes = 0; |
ff3187f6 |
8024 | ssh->mainchan->v.v2.remwindow = ssh_pkt_getuint32(pktin); |
8025 | ssh->mainchan->v.v2.remmaxpkt = ssh_pkt_getuint32(pktin); |
0ed48730 |
8026 | bufchain_init(&ssh->mainchan->v.v2.outbuffer); |
8027 | add234(ssh->channels, ssh->mainchan); |
62638676 |
8028 | update_specials_menu(ssh->frontend); |
0ed48730 |
8029 | logevent("Opened channel for session"); |
feb02b4e |
8030 | ssh->ncmode = FALSE; |
8031 | } |
7cca0d81 |
8032 | |
8033 | /* |
51df0ab5 |
8034 | * Now we have a channel, make dispatch table entries for |
8035 | * general channel-based messages. |
8036 | */ |
8037 | ssh->packet_dispatch[SSH2_MSG_CHANNEL_DATA] = |
8038 | ssh->packet_dispatch[SSH2_MSG_CHANNEL_EXTENDED_DATA] = |
8039 | ssh2_msg_channel_data; |
8040 | ssh->packet_dispatch[SSH2_MSG_CHANNEL_EOF] = ssh2_msg_channel_eof; |
8041 | ssh->packet_dispatch[SSH2_MSG_CHANNEL_CLOSE] = ssh2_msg_channel_close; |
8042 | ssh->packet_dispatch[SSH2_MSG_CHANNEL_OPEN_CONFIRMATION] = |
8043 | ssh2_msg_channel_open_confirmation; |
8044 | ssh->packet_dispatch[SSH2_MSG_CHANNEL_OPEN_FAILURE] = |
8045 | ssh2_msg_channel_open_failure; |
8046 | ssh->packet_dispatch[SSH2_MSG_CHANNEL_REQUEST] = |
8047 | ssh2_msg_channel_request; |
8048 | ssh->packet_dispatch[SSH2_MSG_CHANNEL_OPEN] = |
8049 | ssh2_msg_channel_open; |
8050 | |
8051 | /* |
783415f8 |
8052 | * Potentially enable X11 forwarding. |
8053 | */ |
feb02b4e |
8054 | if (ssh->mainchan && !ssh->ncmode && ssh->cfg.x11_forward) { |
32874aea |
8055 | char proto[20], data[64]; |
8056 | logevent("Requesting X11 forwarding"); |
302121de |
8057 | ssh->x11auth = x11_invent_auth(proto, sizeof(proto), |
86916870 |
8058 | data, sizeof(data), ssh->cfg.x11_auth); |
8059 | x11_get_real_auth(ssh->x11auth, ssh->cfg.x11_display); |
ff3187f6 |
8060 | s->pktout = ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST); |
8061 | ssh2_pkt_adduint32(s->pktout, ssh->mainchan->remoteid); |
8062 | ssh2_pkt_addstring(s->pktout, "x11-req"); |
8063 | ssh2_pkt_addbool(s->pktout, 1); /* want reply */ |
8064 | ssh2_pkt_addbool(s->pktout, 0); /* many connections */ |
8065 | ssh2_pkt_addstring(s->pktout, proto); |
f68353be |
8066 | /* |
8067 | * Note that while we blank the X authentication data here, we don't |
8068 | * take any special action to blank the start of an X11 channel, |
8069 | * so using MIT-MAGIC-COOKIE-1 and actually opening an X connection |
8070 | * without having session blanking enabled is likely to leak your |
8071 | * cookie into the log. |
8072 | */ |
178c3872 |
8073 | dont_log_password(ssh, s->pktout, PKTLOG_BLANK); |
ff3187f6 |
8074 | ssh2_pkt_addstring(s->pktout, data); |
178c3872 |
8075 | end_log_omission(ssh, s->pktout); |
ff3187f6 |
8076 | ssh2_pkt_adduint32(s->pktout, x11_get_screen_number(ssh->cfg.x11_display)); |
8077 | ssh2_pkt_send(ssh, s->pktout); |
32874aea |
8078 | |
b09eaa88 |
8079 | crWaitUntilV(pktin); |
32874aea |
8080 | |
ff3187f6 |
8081 | if (pktin->type != SSH2_MSG_CHANNEL_SUCCESS) { |
8082 | if (pktin->type != SSH2_MSG_CHANNEL_FAILURE) { |
6b5cf8b4 |
8083 | bombout(("Unexpected response to X11 forwarding request:" |
ff3187f6 |
8084 | " packet type %d", pktin->type)); |
7ffdbc1a |
8085 | crStopV; |
32874aea |
8086 | } |
8087 | logevent("X11 forwarding refused"); |
8088 | } else { |
8089 | logevent("X11 forwarding enabled"); |
51470298 |
8090 | ssh->X11_fwd_enabled = TRUE; |
32874aea |
8091 | } |
783415f8 |
8092 | } |
8093 | |
8094 | /* |
bc240b21 |
8095 | * Enable port forwardings. |
8096 | */ |
06fadff5 |
8097 | ssh_setup_portfwd(ssh, &ssh->cfg); |
bc240b21 |
8098 | |
8099 | /* |
36c2a3e9 |
8100 | * Potentially enable agent forwarding. |
8101 | */ |
feb02b4e |
8102 | if (ssh->mainchan && !ssh->ncmode && ssh->cfg.agentfwd && agent_exists()) { |
32874aea |
8103 | logevent("Requesting OpenSSH-style agent forwarding"); |
ff3187f6 |
8104 | s->pktout = ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST); |
8105 | ssh2_pkt_adduint32(s->pktout, ssh->mainchan->remoteid); |
8106 | ssh2_pkt_addstring(s->pktout, "auth-agent-req@openssh.com"); |
8107 | ssh2_pkt_addbool(s->pktout, 1); /* want reply */ |
8108 | ssh2_pkt_send(ssh, s->pktout); |
32874aea |
8109 | |
b09eaa88 |
8110 | crWaitUntilV(pktin); |
32874aea |
8111 | |
ff3187f6 |
8112 | if (pktin->type != SSH2_MSG_CHANNEL_SUCCESS) { |
8113 | if (pktin->type != SSH2_MSG_CHANNEL_FAILURE) { |
6b5cf8b4 |
8114 | bombout(("Unexpected response to agent forwarding request:" |
ff3187f6 |
8115 | " packet type %d", pktin->type)); |
7ffdbc1a |
8116 | crStopV; |
32874aea |
8117 | } |
8118 | logevent("Agent forwarding refused"); |
8119 | } else { |
8120 | logevent("Agent forwarding enabled"); |
51470298 |
8121 | ssh->agentfwd_enabled = TRUE; |
32874aea |
8122 | } |
36c2a3e9 |
8123 | } |
8124 | |
8125 | /* |
7cca0d81 |
8126 | * Now allocate a pty for the session. |
8127 | */ |
feb02b4e |
8128 | if (ssh->mainchan && !ssh->ncmode && !ssh->cfg.nopty) { |
a5dd8467 |
8129 | /* Unpick the terminal-speed string. */ |
8130 | /* XXX perhaps we should allow no speeds to be sent. */ |
db219738 |
8131 | ssh->ospeed = 38400; ssh->ispeed = 38400; /* last-resort defaults */ |
8132 | sscanf(ssh->cfg.termspeed, "%d,%d", &ssh->ospeed, &ssh->ispeed); |
a5dd8467 |
8133 | /* Build the pty request. */ |
ff3187f6 |
8134 | s->pktout = ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST); |
8135 | ssh2_pkt_adduint32(s->pktout, ssh->mainchan->remoteid); /* recipient channel */ |
8136 | ssh2_pkt_addstring(s->pktout, "pty-req"); |
8137 | ssh2_pkt_addbool(s->pktout, 1); /* want reply */ |
8138 | ssh2_pkt_addstring(s->pktout, ssh->cfg.termtype); |
8139 | ssh2_pkt_adduint32(s->pktout, ssh->term_width); |
8140 | ssh2_pkt_adduint32(s->pktout, ssh->term_height); |
8141 | ssh2_pkt_adduint32(s->pktout, 0); /* pixel width */ |
8142 | ssh2_pkt_adduint32(s->pktout, 0); /* pixel height */ |
8143 | ssh2_pkt_addstring_start(s->pktout); |
c6ccd5c2 |
8144 | parse_ttymodes(ssh, ssh->cfg.ttymodes, |
8145 | ssh2_send_ttymode, (void *)s->pktout); |
8146 | ssh2_pkt_addbyte(s->pktout, SSH2_TTY_OP_ISPEED); |
ff3187f6 |
8147 | ssh2_pkt_adduint32(s->pktout, ssh->ispeed); |
c6ccd5c2 |
8148 | ssh2_pkt_addbyte(s->pktout, SSH2_TTY_OP_OSPEED); |
ff3187f6 |
8149 | ssh2_pkt_adduint32(s->pktout, ssh->ospeed); |
8150 | ssh2_pkt_addstring_data(s->pktout, "\0", 1); /* TTY_OP_END */ |
8151 | ssh2_pkt_send(ssh, s->pktout); |
51470298 |
8152 | ssh->state = SSH_STATE_INTERMED; |
32874aea |
8153 | |
b09eaa88 |
8154 | crWaitUntilV(pktin); |
32874aea |
8155 | |
ff3187f6 |
8156 | if (pktin->type != SSH2_MSG_CHANNEL_SUCCESS) { |
8157 | if (pktin->type != SSH2_MSG_CHANNEL_FAILURE) { |
6b5cf8b4 |
8158 | bombout(("Unexpected response to pty request:" |
ff3187f6 |
8159 | " packet type %d", pktin->type)); |
7ffdbc1a |
8160 | crStopV; |
32874aea |
8161 | } |
51470298 |
8162 | c_write_str(ssh, "Server refused to allocate pty\r\n"); |
8163 | ssh->editing = ssh->echoing = 1; |
32874aea |
8164 | } else { |
a5dd8467 |
8165 | logeventf(ssh, "Allocated pty (ospeed %dbps, ispeed %dbps)", |
db219738 |
8166 | ssh->ospeed, ssh->ispeed); |
32874aea |
8167 | } |
0965bee0 |
8168 | } else { |
51470298 |
8169 | ssh->editing = ssh->echoing = 1; |
7cca0d81 |
8170 | } |
8171 | |
8172 | /* |
73feed4f |
8173 | * Send environment variables. |
8174 | * |
8175 | * Simplest thing here is to send all the requests at once, and |
8176 | * then wait for a whole bunch of successes or failures. |
8177 | */ |
feb02b4e |
8178 | if (ssh->mainchan && !ssh->ncmode && *ssh->cfg.environmt) { |
73feed4f |
8179 | char *e = ssh->cfg.environmt; |
8180 | char *var, *varend, *val; |
8181 | |
8182 | s->num_env = 0; |
8183 | |
8184 | while (*e) { |
8185 | var = e; |
8186 | while (*e && *e != '\t') e++; |
8187 | varend = e; |
8188 | if (*e == '\t') e++; |
8189 | val = e; |
8190 | while (*e) e++; |
8191 | e++; |
8192 | |
ff3187f6 |
8193 | s->pktout = ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST); |
8194 | ssh2_pkt_adduint32(s->pktout, ssh->mainchan->remoteid); |
8195 | ssh2_pkt_addstring(s->pktout, "env"); |
8196 | ssh2_pkt_addbool(s->pktout, 1); /* want reply */ |
8197 | ssh2_pkt_addstring_start(s->pktout); |
8198 | ssh2_pkt_addstring_data(s->pktout, var, varend-var); |
8199 | ssh2_pkt_addstring(s->pktout, val); |
8200 | ssh2_pkt_send(ssh, s->pktout); |
73feed4f |
8201 | |
8202 | s->num_env++; |
8203 | } |
8204 | |
8205 | logeventf(ssh, "Sent %d environment variables", s->num_env); |
8206 | |
8207 | s->env_ok = 0; |
8208 | s->env_left = s->num_env; |
8209 | |
8210 | while (s->env_left > 0) { |
b09eaa88 |
8211 | crWaitUntilV(pktin); |
73feed4f |
8212 | |
ff3187f6 |
8213 | if (pktin->type != SSH2_MSG_CHANNEL_SUCCESS) { |
8214 | if (pktin->type != SSH2_MSG_CHANNEL_FAILURE) { |
73feed4f |
8215 | bombout(("Unexpected response to environment request:" |
ff3187f6 |
8216 | " packet type %d", pktin->type)); |
73feed4f |
8217 | crStopV; |
8218 | } |
8219 | } else { |
8220 | s->env_ok++; |
8221 | } |
8222 | |
8223 | s->env_left--; |
8224 | } |
8225 | |
8226 | if (s->env_ok == s->num_env) { |
8227 | logevent("All environment variables successfully set"); |
8228 | } else if (s->env_ok == 0) { |
8229 | logevent("All environment variables refused"); |
8230 | c_write_str(ssh, "Server refused to set environment variables\r\n"); |
8231 | } else { |
8232 | logeventf(ssh, "%d environment variables refused", |
8233 | s->num_env - s->env_ok); |
8234 | c_write_str(ssh, "Server refused to set all environment variables\r\n"); |
8235 | } |
8236 | } |
8237 | |
8238 | /* |
fd5e5847 |
8239 | * Start a shell or a remote command. We may have to attempt |
8240 | * this twice if the config data has provided a second choice |
8241 | * of command. |
7cca0d81 |
8242 | */ |
feb02b4e |
8243 | if (ssh->mainchan && !ssh->ncmode) while (1) { |
fd5e5847 |
8244 | int subsys; |
8245 | char *cmd; |
8246 | |
51470298 |
8247 | if (ssh->fallback_cmd) { |
86916870 |
8248 | subsys = ssh->cfg.ssh_subsys2; |
8249 | cmd = ssh->cfg.remote_cmd_ptr2; |
fd5e5847 |
8250 | } else { |
86916870 |
8251 | subsys = ssh->cfg.ssh_subsys; |
8252 | cmd = ssh->cfg.remote_cmd_ptr; |
04c52f10 |
8253 | if (!cmd) cmd = ssh->cfg.remote_cmd; |
fd5e5847 |
8254 | } |
8255 | |
ff3187f6 |
8256 | s->pktout = ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST); |
8257 | ssh2_pkt_adduint32(s->pktout, ssh->mainchan->remoteid); /* recipient channel */ |
fd5e5847 |
8258 | if (subsys) { |
ff3187f6 |
8259 | ssh2_pkt_addstring(s->pktout, "subsystem"); |
8260 | ssh2_pkt_addbool(s->pktout, 1); /* want reply */ |
8261 | ssh2_pkt_addstring(s->pktout, cmd); |
fd5e5847 |
8262 | } else if (*cmd) { |
ff3187f6 |
8263 | ssh2_pkt_addstring(s->pktout, "exec"); |
8264 | ssh2_pkt_addbool(s->pktout, 1); /* want reply */ |
8265 | ssh2_pkt_addstring(s->pktout, cmd); |
fd5e5847 |
8266 | } else { |
ff3187f6 |
8267 | ssh2_pkt_addstring(s->pktout, "shell"); |
8268 | ssh2_pkt_addbool(s->pktout, 1); /* want reply */ |
32874aea |
8269 | } |
ff3187f6 |
8270 | ssh2_pkt_send(ssh, s->pktout); |
b09eaa88 |
8271 | |
8272 | crWaitUntilV(pktin); |
8273 | |
ff3187f6 |
8274 | if (pktin->type != SSH2_MSG_CHANNEL_SUCCESS) { |
8275 | if (pktin->type != SSH2_MSG_CHANNEL_FAILURE) { |
6b5cf8b4 |
8276 | bombout(("Unexpected response to shell/command request:" |
ff3187f6 |
8277 | " packet type %d", pktin->type)); |
7ffdbc1a |
8278 | crStopV; |
fd5e5847 |
8279 | } |
8280 | /* |
8281 | * We failed to start the command. If this is the |
8282 | * fallback command, we really are finished; if it's |
8283 | * not, and if the fallback command exists, try falling |
8284 | * back to it before complaining. |
8285 | */ |
86916870 |
8286 | if (!ssh->fallback_cmd && ssh->cfg.remote_cmd_ptr2 != NULL) { |
fd5e5847 |
8287 | logevent("Primary command failed; attempting fallback"); |
51470298 |
8288 | ssh->fallback_cmd = TRUE; |
fd5e5847 |
8289 | continue; |
8290 | } |
6b5cf8b4 |
8291 | bombout(("Server refused to start a shell/command")); |
7ffdbc1a |
8292 | crStopV; |
fd5e5847 |
8293 | } else { |
8294 | logevent("Started a shell/command"); |
32874aea |
8295 | } |
fd5e5847 |
8296 | break; |
7cca0d81 |
8297 | } |
8298 | |
51470298 |
8299 | ssh->state = SSH_STATE_SESSION; |
8300 | if (ssh->size_needed) |
8301 | ssh_size(ssh, ssh->term_width, ssh->term_height); |
8302 | if (ssh->eof_needed) |
8303 | ssh_special(ssh, TS_EOF); |
6e48c3fe |
8304 | |
7cca0d81 |
8305 | /* |
8306 | * Transfer data! |
8307 | */ |
b9d7bcad |
8308 | if (ssh->ldisc) |
8309 | ldisc_send(ssh->ldisc, NULL, 0, 0);/* cause ldisc to notice changes */ |
0ed48730 |
8310 | if (ssh->mainchan) |
8311 | ssh->send_ok = 1; |
7cca0d81 |
8312 | while (1) { |
e5574168 |
8313 | crReturnV; |
51470298 |
8314 | s->try_send = FALSE; |
ff3187f6 |
8315 | if (pktin) { |
2b7540a7 |
8316 | |
51df0ab5 |
8317 | /* |
8318 | * _All_ the connection-layer packets we expect to |
8319 | * receive are now handled by the dispatch table. |
8320 | * Anything that reaches here must be bogus. |
8321 | */ |
32874aea |
8322 | |
51df0ab5 |
8323 | bombout(("Strange packet received: type %d", pktin->type)); |
8324 | crStopV; |
0ed48730 |
8325 | } else if (ssh->mainchan) { |
32874aea |
8326 | /* |
8327 | * We have spare data. Add it to the channel buffer. |
8328 | */ |
d8baa528 |
8329 | ssh2_add_channel_data(ssh->mainchan, (char *)in, inlen); |
51470298 |
8330 | s->try_send = TRUE; |
32874aea |
8331 | } |
51470298 |
8332 | if (s->try_send) { |
32874aea |
8333 | int i; |
8334 | struct ssh_channel *c; |
8335 | /* |
8336 | * Try to send data on all channels if we can. |
8337 | */ |
1bfc7e93 |
8338 | for (i = 0; NULL != (c = index234(ssh->channels, i)); i++) |
8339 | ssh2_try_send_and_unthrottle(c); |
7cca0d81 |
8340 | } |
e5574168 |
8341 | } |
8342 | |
8343 | crFinishV; |
8344 | } |
8345 | |
8346 | /* |
2e85c969 |
8347 | * Handlers for SSH-2 messages that might arrive at any moment. |
b09eaa88 |
8348 | */ |
409bfa77 |
8349 | static void ssh2_msg_disconnect(Ssh ssh, struct Packet *pktin) |
b09eaa88 |
8350 | { |
8351 | /* log reason code in disconnect message */ |
8352 | char *buf, *msg; |
8353 | int nowlen, reason, msglen; |
8354 | |
8355 | reason = ssh_pkt_getuint32(pktin); |
8356 | ssh_pkt_getstring(pktin, &msg, &msglen); |
8357 | |
8358 | if (reason > 0 && reason < lenof(ssh2_disconnect_reasons)) { |
8359 | buf = dupprintf("Received disconnect message (%s)", |
8360 | ssh2_disconnect_reasons[reason]); |
8361 | } else { |
8362 | buf = dupprintf("Received disconnect message (unknown" |
8363 | " type %d)", reason); |
8364 | } |
8365 | logevent(buf); |
8366 | sfree(buf); |
8367 | buf = dupprintf("Disconnection message text: %n%.*s", |
8368 | &nowlen, msglen, msg); |
8369 | logevent(buf); |
8370 | bombout(("Server sent disconnect message\ntype %d (%s):\n\"%s\"", |
8371 | reason, |
8372 | (reason > 0 && reason < lenof(ssh2_disconnect_reasons)) ? |
8373 | ssh2_disconnect_reasons[reason] : "unknown", |
8374 | buf+nowlen)); |
8375 | sfree(buf); |
8376 | } |
8377 | |
409bfa77 |
8378 | static void ssh2_msg_debug(Ssh ssh, struct Packet *pktin) |
b09eaa88 |
8379 | { |
8380 | /* log the debug message */ |
fb983202 |
8381 | char *msg; |
b09eaa88 |
8382 | int msglen; |
8383 | int always_display; |
8384 | |
8385 | /* XXX maybe we should actually take notice of this */ |
8386 | always_display = ssh2_pkt_getbool(pktin); |
8387 | ssh_pkt_getstring(pktin, &msg, &msglen); |
8388 | |
fb983202 |
8389 | logeventf(ssh, "Remote debug message: %.*s", msglen, msg); |
b09eaa88 |
8390 | } |
8391 | |
409bfa77 |
8392 | static void ssh2_msg_something_unimplemented(Ssh ssh, struct Packet *pktin) |
b09eaa88 |
8393 | { |
8394 | struct Packet *pktout; |
8395 | pktout = ssh2_pkt_init(SSH2_MSG_UNIMPLEMENTED); |
8396 | ssh2_pkt_adduint32(pktout, pktin->sequence); |
8397 | /* |
8398 | * UNIMPLEMENTED messages MUST appear in the same order as the |
8399 | * messages they respond to. Hence, never queue them. |
8400 | */ |
8401 | ssh2_pkt_send_noqueue(ssh, pktout); |
8402 | } |
8403 | |
8404 | /* |
2e85c969 |
8405 | * Handle the top-level SSH-2 protocol. |
7cca0d81 |
8406 | */ |
b09eaa88 |
8407 | static void ssh2_protocol_setup(Ssh ssh) |
8408 | { |
8409 | int i; |
8410 | |
8411 | /* |
8412 | * Most messages cause SSH2_MSG_UNIMPLEMENTED. |
8413 | */ |
8414 | for (i = 0; i < 256; i++) |
8415 | ssh->packet_dispatch[i] = ssh2_msg_something_unimplemented; |
8416 | |
8417 | /* |
8418 | * Any message we actually understand, we set to NULL so that |
8419 | * the coroutines will get it. |
8420 | */ |
8421 | ssh->packet_dispatch[SSH2_MSG_UNIMPLEMENTED] = NULL; |
8422 | ssh->packet_dispatch[SSH2_MSG_SERVICE_REQUEST] = NULL; |
8423 | ssh->packet_dispatch[SSH2_MSG_SERVICE_ACCEPT] = NULL; |
8424 | ssh->packet_dispatch[SSH2_MSG_KEXINIT] = NULL; |
8425 | ssh->packet_dispatch[SSH2_MSG_NEWKEYS] = NULL; |
8426 | ssh->packet_dispatch[SSH2_MSG_KEXDH_INIT] = NULL; |
8427 | ssh->packet_dispatch[SSH2_MSG_KEXDH_REPLY] = NULL; |
8428 | /* ssh->packet_dispatch[SSH2_MSG_KEX_DH_GEX_REQUEST] = NULL; duplicate case value */ |
8429 | /* ssh->packet_dispatch[SSH2_MSG_KEX_DH_GEX_GROUP] = NULL; duplicate case value */ |
8430 | ssh->packet_dispatch[SSH2_MSG_KEX_DH_GEX_INIT] = NULL; |
8431 | ssh->packet_dispatch[SSH2_MSG_KEX_DH_GEX_REPLY] = NULL; |
8432 | ssh->packet_dispatch[SSH2_MSG_USERAUTH_REQUEST] = NULL; |
8433 | ssh->packet_dispatch[SSH2_MSG_USERAUTH_FAILURE] = NULL; |
8434 | ssh->packet_dispatch[SSH2_MSG_USERAUTH_SUCCESS] = NULL; |
8435 | ssh->packet_dispatch[SSH2_MSG_USERAUTH_BANNER] = NULL; |
8436 | ssh->packet_dispatch[SSH2_MSG_USERAUTH_PK_OK] = NULL; |
8437 | /* ssh->packet_dispatch[SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ] = NULL; duplicate case value */ |
8438 | /* ssh->packet_dispatch[SSH2_MSG_USERAUTH_INFO_REQUEST] = NULL; duplicate case value */ |
8439 | ssh->packet_dispatch[SSH2_MSG_USERAUTH_INFO_RESPONSE] = NULL; |
8440 | ssh->packet_dispatch[SSH2_MSG_GLOBAL_REQUEST] = NULL; |
8441 | ssh->packet_dispatch[SSH2_MSG_REQUEST_SUCCESS] = NULL; |
8442 | ssh->packet_dispatch[SSH2_MSG_REQUEST_FAILURE] = NULL; |
8443 | ssh->packet_dispatch[SSH2_MSG_CHANNEL_OPEN] = NULL; |
8444 | ssh->packet_dispatch[SSH2_MSG_CHANNEL_OPEN_CONFIRMATION] = NULL; |
8445 | ssh->packet_dispatch[SSH2_MSG_CHANNEL_OPEN_FAILURE] = NULL; |
8446 | ssh->packet_dispatch[SSH2_MSG_CHANNEL_WINDOW_ADJUST] = NULL; |
8447 | ssh->packet_dispatch[SSH2_MSG_CHANNEL_DATA] = NULL; |
8448 | ssh->packet_dispatch[SSH2_MSG_CHANNEL_EXTENDED_DATA] = NULL; |
8449 | ssh->packet_dispatch[SSH2_MSG_CHANNEL_EOF] = NULL; |
8450 | ssh->packet_dispatch[SSH2_MSG_CHANNEL_CLOSE] = NULL; |
8451 | ssh->packet_dispatch[SSH2_MSG_CHANNEL_REQUEST] = NULL; |
8452 | ssh->packet_dispatch[SSH2_MSG_CHANNEL_SUCCESS] = NULL; |
8453 | ssh->packet_dispatch[SSH2_MSG_CHANNEL_FAILURE] = NULL; |
8454 | |
8455 | /* |
8456 | * These special message types we install handlers for. |
8457 | */ |
8458 | ssh->packet_dispatch[SSH2_MSG_DISCONNECT] = ssh2_msg_disconnect; |
2e85c969 |
8459 | ssh->packet_dispatch[SSH2_MSG_IGNORE] = ssh_msg_ignore; /* shared with SSH-1 */ |
b09eaa88 |
8460 | ssh->packet_dispatch[SSH2_MSG_DEBUG] = ssh2_msg_debug; |
8461 | } |
8462 | |
9442dd57 |
8463 | static void ssh2_timer(void *ctx, long now) |
8464 | { |
8465 | Ssh ssh = (Ssh)ctx; |
8466 | |
ecbb0000 |
8467 | if (ssh->state == SSH_STATE_CLOSED) |
8468 | return; |
8469 | |
e6c1536e |
8470 | if (!ssh->kex_in_progress && ssh->cfg.ssh_rekey_time != 0 && |
9442dd57 |
8471 | now - ssh->next_rekey >= 0) { |
f382c87d |
8472 | do_ssh2_transport(ssh, "timeout", -1, NULL); |
9442dd57 |
8473 | } |
8474 | } |
8475 | |
1c1a7262 |
8476 | static void ssh2_protocol(Ssh ssh, void *vin, int inlen, |
ff3187f6 |
8477 | struct Packet *pktin) |
7cca0d81 |
8478 | { |
1c1a7262 |
8479 | unsigned char *in = (unsigned char *)vin; |
b09eaa88 |
8480 | if (ssh->state == SSH_STATE_CLOSED) |
8481 | return; |
8482 | |
9442dd57 |
8483 | if (pktin) { |
8484 | ssh->incoming_data_size += pktin->encrypted_len; |
8485 | if (!ssh->kex_in_progress && |
d57f70af |
8486 | ssh->max_data_size != 0 && |
8487 | ssh->incoming_data_size > ssh->max_data_size) |
f382c87d |
8488 | do_ssh2_transport(ssh, "too much data received", -1, NULL); |
9442dd57 |
8489 | } |
8490 | |
b09eaa88 |
8491 | if (pktin && ssh->packet_dispatch[pktin->type]) { |
8492 | ssh->packet_dispatch[pktin->type](ssh, pktin); |
32874aea |
8493 | return; |
b09eaa88 |
8494 | } |
8495 | |
8496 | if (!ssh->protocol_initial_phase_done || |
8497 | (pktin && pktin->type >= 20 && pktin->type < 50)) { |
8498 | if (do_ssh2_transport(ssh, in, inlen, pktin) && |
8499 | !ssh->protocol_initial_phase_done) { |
8500 | ssh->protocol_initial_phase_done = TRUE; |
8501 | /* |
8502 | * Allow authconn to initialise itself. |
8503 | */ |
8504 | do_ssh2_authconn(ssh, NULL, 0, NULL); |
8505 | } |
8506 | } else { |
8507 | do_ssh2_authconn(ssh, in, inlen, pktin); |
8508 | } |
7cca0d81 |
8509 | } |
8510 | |
8511 | /* |
8df7a775 |
8512 | * Called to set up the connection. |
374330e2 |
8513 | * |
8514 | * Returns an error message, or NULL on success. |
374330e2 |
8515 | */ |
cbe2d68f |
8516 | static const char *ssh_init(void *frontend_handle, void **backend_handle, |
8517 | Config *cfg, |
79bf227b |
8518 | char *host, int port, char **realhost, int nodelay, |
8519 | int keepalive) |
32874aea |
8520 | { |
cbe2d68f |
8521 | const char *p; |
51470298 |
8522 | Ssh ssh; |
8523 | |
3d88e64d |
8524 | ssh = snew(struct ssh_tag); |
86916870 |
8525 | ssh->cfg = *cfg; /* STRUCTURE COPY */ |
125105d1 |
8526 | ssh->version = 0; /* when not ready yet */ |
51470298 |
8527 | ssh->s = NULL; |
8528 | ssh->cipher = NULL; |
371e569c |
8529 | ssh->v1_cipher_ctx = NULL; |
0183b242 |
8530 | ssh->crcda_ctx = NULL; |
51470298 |
8531 | ssh->cscipher = NULL; |
371e569c |
8532 | ssh->cs_cipher_ctx = NULL; |
51470298 |
8533 | ssh->sccipher = NULL; |
371e569c |
8534 | ssh->sc_cipher_ctx = NULL; |
51470298 |
8535 | ssh->csmac = NULL; |
a8327734 |
8536 | ssh->cs_mac_ctx = NULL; |
51470298 |
8537 | ssh->scmac = NULL; |
e0e1a00d |
8538 | ssh->sc_mac_ctx = NULL; |
51470298 |
8539 | ssh->cscomp = NULL; |
5366aed8 |
8540 | ssh->cs_comp_ctx = NULL; |
51470298 |
8541 | ssh->sccomp = NULL; |
5366aed8 |
8542 | ssh->sc_comp_ctx = NULL; |
51470298 |
8543 | ssh->kex = NULL; |
389aa499 |
8544 | ssh->kex_ctx = NULL; |
51470298 |
8545 | ssh->hostkey = NULL; |
8546 | ssh->exitcode = -1; |
ac934965 |
8547 | ssh->close_expected = FALSE; |
9e296bfa |
8548 | ssh->clean_exit = FALSE; |
51470298 |
8549 | ssh->state = SSH_STATE_PREPACKET; |
8550 | ssh->size_needed = FALSE; |
8551 | ssh->eof_needed = FALSE; |
b9d7bcad |
8552 | ssh->ldisc = NULL; |
a8327734 |
8553 | ssh->logctx = NULL; |
51470298 |
8554 | ssh->deferred_send_data = NULL; |
8555 | ssh->deferred_len = 0; |
8556 | ssh->deferred_size = 0; |
8557 | ssh->fallback_cmd = 0; |
8558 | ssh->pkt_ctx = 0; |
302121de |
8559 | ssh->x11auth = NULL; |
be738459 |
8560 | ssh->v1_compressing = FALSE; |
51470298 |
8561 | ssh->v2_outgoing_sequence = 0; |
8562 | ssh->ssh1_rdpkt_crstate = 0; |
8563 | ssh->ssh2_rdpkt_crstate = 0; |
8564 | ssh->do_ssh_init_crstate = 0; |
8565 | ssh->ssh_gotdata_crstate = 0; |
b09eaa88 |
8566 | ssh->do_ssh1_connection_crstate = 0; |
51470298 |
8567 | ssh->do_ssh1_login_crstate = 0; |
8568 | ssh->do_ssh2_transport_crstate = 0; |
8569 | ssh->do_ssh2_authconn_crstate = 0; |
8570 | ssh->do_ssh_init_state = NULL; |
8571 | ssh->do_ssh1_login_state = NULL; |
8572 | ssh->do_ssh2_transport_state = NULL; |
8573 | ssh->do_ssh2_authconn_state = NULL; |
4320baf7 |
8574 | ssh->v_c = NULL; |
8575 | ssh->v_s = NULL; |
6571dbfd |
8576 | ssh->mainchan = NULL; |
968d2d92 |
8577 | ssh->throttled_all = 0; |
8578 | ssh->v1_stdout_throttling = 0; |
590f6a5f |
8579 | ssh->queue = NULL; |
8580 | ssh->queuelen = ssh->queuesize = 0; |
8581 | ssh->queueing = FALSE; |
06fadff5 |
8582 | ssh->qhead = ssh->qtail = NULL; |
e13bba36 |
8583 | ssh->deferred_rekey_reason = NULL; |
3d9449a1 |
8584 | bufchain_init(&ssh->queued_incoming_data); |
8585 | ssh->frozen = FALSE; |
51470298 |
8586 | |
8587 | *backend_handle = ssh; |
32874aea |
8588 | |
8f203108 |
8589 | #ifdef MSCRYPTOAPI |
32874aea |
8590 | if (crypto_startup() == 0) |
8f203108 |
8591 | return "Microsoft high encryption pack not installed!"; |
8592 | #endif |
374330e2 |
8593 | |
51470298 |
8594 | ssh->frontend = frontend_handle; |
86916870 |
8595 | ssh->term_width = ssh->cfg.width; |
8596 | ssh->term_height = ssh->cfg.height; |
887035a5 |
8597 | |
fabd1805 |
8598 | ssh->channels = NULL; |
8599 | ssh->rportfwds = NULL; |
f47a5ffb |
8600 | ssh->portfwds = NULL; |
fabd1805 |
8601 | |
51470298 |
8602 | ssh->send_ok = 0; |
8603 | ssh->editing = 0; |
8604 | ssh->echoing = 0; |
8605 | ssh->v1_throttle_count = 0; |
8606 | ssh->overall_bufsize = 0; |
8607 | ssh->fallback_cmd = 0; |
8df7a775 |
8608 | |
3648d4c5 |
8609 | ssh->protocol = NULL; |
8610 | |
b09eaa88 |
8611 | ssh->protocol_initial_phase_done = FALSE; |
8612 | |
39934deb |
8613 | ssh->pinger = NULL; |
8614 | |
9442dd57 |
8615 | ssh->incoming_data_size = ssh->outgoing_data_size = |
8616 | ssh->deferred_data_size = 0L; |
d57f70af |
8617 | ssh->max_data_size = parse_blocksize(ssh->cfg.ssh_rekey_data); |
9442dd57 |
8618 | ssh->kex_in_progress = FALSE; |
8619 | |
79bf227b |
8620 | p = connect_to_host(ssh, host, port, realhost, nodelay, keepalive); |
fb09bf1c |
8621 | if (p != NULL) |
8622 | return p; |
374330e2 |
8623 | |
5d17ccfc |
8624 | random_ref(); |
8625 | |
374330e2 |
8626 | return NULL; |
8627 | } |
8628 | |
fabd1805 |
8629 | static void ssh_free(void *handle) |
8630 | { |
8631 | Ssh ssh = (Ssh) handle; |
8632 | struct ssh_channel *c; |
8633 | struct ssh_rportfwd *pf; |
8634 | |
8635 | if (ssh->v1_cipher_ctx) |
8636 | ssh->cipher->free_context(ssh->v1_cipher_ctx); |
8637 | if (ssh->cs_cipher_ctx) |
8638 | ssh->cscipher->free_context(ssh->cs_cipher_ctx); |
8639 | if (ssh->sc_cipher_ctx) |
8640 | ssh->sccipher->free_context(ssh->sc_cipher_ctx); |
8641 | if (ssh->cs_mac_ctx) |
8642 | ssh->csmac->free_context(ssh->cs_mac_ctx); |
8643 | if (ssh->sc_mac_ctx) |
8644 | ssh->scmac->free_context(ssh->sc_mac_ctx); |
29b1d0b3 |
8645 | if (ssh->cs_comp_ctx) { |
8646 | if (ssh->cscomp) |
8647 | ssh->cscomp->compress_cleanup(ssh->cs_comp_ctx); |
8648 | else |
8649 | zlib_compress_cleanup(ssh->cs_comp_ctx); |
8650 | } |
8651 | if (ssh->sc_comp_ctx) { |
8652 | if (ssh->sccomp) |
8653 | ssh->sccomp->decompress_cleanup(ssh->sc_comp_ctx); |
8654 | else |
8655 | zlib_decompress_cleanup(ssh->sc_comp_ctx); |
8656 | } |
fabd1805 |
8657 | if (ssh->kex_ctx) |
8658 | dh_cleanup(ssh->kex_ctx); |
8659 | sfree(ssh->savedhost); |
8660 | |
590f6a5f |
8661 | while (ssh->queuelen-- > 0) |
8662 | ssh_free_packet(ssh->queue[ssh->queuelen]); |
8663 | sfree(ssh->queue); |
8664 | |
06fadff5 |
8665 | while (ssh->qhead) { |
8666 | struct queued_handler *qh = ssh->qhead; |
8667 | ssh->qhead = qh->next; |
8668 | sfree(ssh->qhead); |
8669 | } |
8670 | ssh->qhead = ssh->qtail = NULL; |
8671 | |
fabd1805 |
8672 | if (ssh->channels) { |
8673 | while ((c = delpos234(ssh->channels, 0)) != NULL) { |
8674 | switch (c->type) { |
8675 | case CHAN_X11: |
8676 | if (c->u.x11.s != NULL) |
8677 | x11_close(c->u.x11.s); |
8678 | break; |
8679 | case CHAN_SOCKDATA: |
8680 | if (c->u.pfd.s != NULL) |
8681 | pfd_close(c->u.pfd.s); |
8682 | break; |
8683 | } |
8684 | sfree(c); |
8685 | } |
8686 | freetree234(ssh->channels); |
cdb52705 |
8687 | ssh->channels = NULL; |
fabd1805 |
8688 | } |
8689 | |
8690 | if (ssh->rportfwds) { |
8691 | while ((pf = delpos234(ssh->rportfwds, 0)) != NULL) |
8692 | sfree(pf); |
8693 | freetree234(ssh->rportfwds); |
cdb52705 |
8694 | ssh->rportfwds = NULL; |
fabd1805 |
8695 | } |
8696 | sfree(ssh->deferred_send_data); |
8697 | if (ssh->x11auth) |
8698 | x11_free_auth(ssh->x11auth); |
8699 | sfree(ssh->do_ssh_init_state); |
8700 | sfree(ssh->do_ssh1_login_state); |
8701 | sfree(ssh->do_ssh2_transport_state); |
8702 | sfree(ssh->do_ssh2_authconn_state); |
4320baf7 |
8703 | sfree(ssh->v_c); |
8704 | sfree(ssh->v_s); |
679539d7 |
8705 | if (ssh->crcda_ctx) { |
8706 | crcda_free_context(ssh->crcda_ctx); |
8707 | ssh->crcda_ctx = NULL; |
8708 | } |
fabd1805 |
8709 | if (ssh->s) |
ac934965 |
8710 | ssh_do_close(ssh, TRUE); |
9442dd57 |
8711 | expire_timer_context(ssh); |
39934deb |
8712 | if (ssh->pinger) |
8713 | pinger_free(ssh->pinger); |
3d9449a1 |
8714 | bufchain_clear(&ssh->queued_incoming_data); |
ee50e8b6 |
8715 | sfree(ssh); |
5d17ccfc |
8716 | |
8717 | random_unref(); |
fabd1805 |
8718 | } |
8719 | |
374330e2 |
8720 | /* |
86916870 |
8721 | * Reconfigure the SSH backend. |
86916870 |
8722 | */ |
8723 | static void ssh_reconfig(void *handle, Config *cfg) |
8724 | { |
8725 | Ssh ssh = (Ssh) handle; |
e13bba36 |
8726 | char *rekeying = NULL, rekey_mandatory = FALSE; |
e6c1536e |
8727 | unsigned long old_max_data_size; |
8728 | |
39934deb |
8729 | pinger_reconfig(ssh->pinger, &ssh->cfg, cfg); |
3b6606c7 |
8730 | if (ssh->portfwds) |
8731 | ssh_setup_portfwd(ssh, cfg); |
e6c1536e |
8732 | |
8733 | if (ssh->cfg.ssh_rekey_time != cfg->ssh_rekey_time && |
8734 | cfg->ssh_rekey_time != 0) { |
8735 | long new_next = ssh->last_rekey + cfg->ssh_rekey_time*60*TICKSPERSEC; |
8736 | long now = GETTICKCOUNT(); |
8737 | |
8738 | if (new_next - now < 0) { |
f382c87d |
8739 | rekeying = "timeout shortened"; |
e6c1536e |
8740 | } else { |
8741 | ssh->next_rekey = schedule_timer(new_next - now, ssh2_timer, ssh); |
8742 | } |
8743 | } |
8744 | |
8745 | old_max_data_size = ssh->max_data_size; |
8746 | ssh->max_data_size = parse_blocksize(cfg->ssh_rekey_data); |
8747 | if (old_max_data_size != ssh->max_data_size && |
8748 | ssh->max_data_size != 0) { |
8749 | if (ssh->outgoing_data_size > ssh->max_data_size || |
8750 | ssh->incoming_data_size > ssh->max_data_size) |
f382c87d |
8751 | rekeying = "data limit lowered"; |
e6c1536e |
8752 | } |
8753 | |
e13bba36 |
8754 | if (ssh->cfg.compression != cfg->compression) { |
f382c87d |
8755 | rekeying = "compression setting changed"; |
e13bba36 |
8756 | rekey_mandatory = TRUE; |
8757 | } |
8758 | |
8759 | if (ssh->cfg.ssh2_des_cbc != cfg->ssh2_des_cbc || |
8760 | memcmp(ssh->cfg.ssh_cipherlist, cfg->ssh_cipherlist, |
8761 | sizeof(ssh->cfg.ssh_cipherlist))) { |
f382c87d |
8762 | rekeying = "cipher settings changed"; |
e13bba36 |
8763 | rekey_mandatory = TRUE; |
e6c1536e |
8764 | } |
8765 | |
86916870 |
8766 | ssh->cfg = *cfg; /* STRUCTURE COPY */ |
e13bba36 |
8767 | |
8768 | if (rekeying) { |
8769 | if (!ssh->kex_in_progress) { |
8770 | do_ssh2_transport(ssh, rekeying, -1, NULL); |
8771 | } else if (rekey_mandatory) { |
8772 | ssh->deferred_rekey_reason = rekeying; |
8773 | } |
8774 | } |
86916870 |
8775 | } |
8776 | |
8777 | /* |
86dc445a |
8778 | * Called to send data down the SSH connection. |
374330e2 |
8779 | */ |
51470298 |
8780 | static int ssh_send(void *handle, char *buf, int len) |
32874aea |
8781 | { |
51470298 |
8782 | Ssh ssh = (Ssh) handle; |
8783 | |
8784 | if (ssh == NULL || ssh->s == NULL || ssh->protocol == NULL) |
5471d09a |
8785 | return 0; |
374330e2 |
8786 | |
d8baa528 |
8787 | ssh->protocol(ssh, (unsigned char *)buf, len, 0); |
5471d09a |
8788 | |
51470298 |
8789 | return ssh_sendbuffer(ssh); |
5471d09a |
8790 | } |
8791 | |
8792 | /* |
8793 | * Called to query the current amount of buffered stdin data. |
8794 | */ |
51470298 |
8795 | static int ssh_sendbuffer(void *handle) |
5471d09a |
8796 | { |
51470298 |
8797 | Ssh ssh = (Ssh) handle; |
5471d09a |
8798 | int override_value; |
8799 | |
51470298 |
8800 | if (ssh == NULL || ssh->s == NULL || ssh->protocol == NULL) |
5471d09a |
8801 | return 0; |
8802 | |
8803 | /* |
8804 | * If the SSH socket itself has backed up, add the total backup |
8805 | * size on that to any individual buffer on the stdin channel. |
8806 | */ |
8807 | override_value = 0; |
51470298 |
8808 | if (ssh->throttled_all) |
8809 | override_value = ssh->overall_bufsize; |
5471d09a |
8810 | |
51470298 |
8811 | if (ssh->version == 1) { |
5471d09a |
8812 | return override_value; |
51470298 |
8813 | } else if (ssh->version == 2) { |
8814 | if (!ssh->mainchan || ssh->mainchan->closes > 0) |
5471d09a |
8815 | return override_value; |
8816 | else |
51470298 |
8817 | return (override_value + |
8818 | bufchain_size(&ssh->mainchan->v.v2.outbuffer)); |
5471d09a |
8819 | } |
8820 | |
8821 | return 0; |
374330e2 |
8822 | } |
8823 | |
8824 | /* |
6e48c3fe |
8825 | * Called to set the size of the window from SSH's POV. |
374330e2 |
8826 | */ |
51470298 |
8827 | static void ssh_size(void *handle, int width, int height) |
32874aea |
8828 | { |
51470298 |
8829 | Ssh ssh = (Ssh) handle; |
ff3187f6 |
8830 | struct Packet *pktout; |
51470298 |
8831 | |
8832 | ssh->term_width = width; |
8833 | ssh->term_height = height; |
f278d6f8 |
8834 | |
51470298 |
8835 | switch (ssh->state) { |
374330e2 |
8836 | case SSH_STATE_BEFORE_SIZE: |
3687d221 |
8837 | case SSH_STATE_PREPACKET: |
21248260 |
8838 | case SSH_STATE_CLOSED: |
374330e2 |
8839 | break; /* do nothing */ |
8840 | case SSH_STATE_INTERMED: |
51470298 |
8841 | ssh->size_needed = TRUE; /* buffer for later */ |
374330e2 |
8842 | break; |
8843 | case SSH_STATE_SESSION: |
86916870 |
8844 | if (!ssh->cfg.nopty) { |
51470298 |
8845 | if (ssh->version == 1) { |
8846 | send_packet(ssh, SSH1_CMSG_WINDOW_SIZE, |
8847 | PKT_INT, ssh->term_height, |
8848 | PKT_INT, ssh->term_width, |
32874aea |
8849 | PKT_INT, 0, PKT_INT, 0, PKT_END); |
0ed48730 |
8850 | } else if (ssh->mainchan) { |
ff3187f6 |
8851 | pktout = ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST); |
8852 | ssh2_pkt_adduint32(pktout, ssh->mainchan->remoteid); |
8853 | ssh2_pkt_addstring(pktout, "window-change"); |
8854 | ssh2_pkt_addbool(pktout, 0); |
8855 | ssh2_pkt_adduint32(pktout, ssh->term_width); |
8856 | ssh2_pkt_adduint32(pktout, ssh->term_height); |
8857 | ssh2_pkt_adduint32(pktout, 0); |
8858 | ssh2_pkt_adduint32(pktout, 0); |
8859 | ssh2_pkt_send(ssh, pktout); |
32874aea |
8860 | } |
8861 | } |
8862 | break; |
374330e2 |
8863 | } |
8864 | } |
8865 | |
8866 | /* |
125105d1 |
8867 | * Return a list of the special codes that make sense in this |
8868 | * protocol. |
8869 | */ |
8870 | static const struct telnet_special *ssh_get_specials(void *handle) |
8871 | { |
786ba75e |
8872 | static const struct telnet_special ssh1_ignore_special[] = { |
8873 | {"IGNORE message", TS_NOP} |
8874 | }; |
8875 | static const struct telnet_special ssh2_transport_specials[] = { |
62638676 |
8876 | {"IGNORE message", TS_NOP}, |
9442dd57 |
8877 | {"Repeat key exchange", TS_REKEY}, |
62638676 |
8878 | }; |
8879 | static const struct telnet_special ssh2_session_specials[] = { |
6f2d0cde |
8880 | {NULL, TS_SEP}, |
8881 | {"Break", TS_BRK}, |
786ba75e |
8882 | /* These are the signal names defined by draft-ietf-secsh-connect-23. |
6f2d0cde |
8883 | * They include all the ISO C signals, but are a subset of the POSIX |
8884 | * required signals. */ |
8885 | {"SIGINT (Interrupt)", TS_SIGINT}, |
8886 | {"SIGTERM (Terminate)", TS_SIGTERM}, |
8887 | {"SIGKILL (Kill)", TS_SIGKILL}, |
8888 | {"SIGQUIT (Quit)", TS_SIGQUIT}, |
8889 | {"SIGHUP (Hangup)", TS_SIGHUP}, |
8890 | {"More signals", TS_SUBMENU}, |
8891 | {"SIGABRT", TS_SIGABRT}, {"SIGALRM", TS_SIGALRM}, |
8892 | {"SIGFPE", TS_SIGFPE}, {"SIGILL", TS_SIGILL}, |
8893 | {"SIGPIPE", TS_SIGPIPE}, {"SIGSEGV", TS_SIGSEGV}, |
8894 | {"SIGUSR1", TS_SIGUSR1}, {"SIGUSR2", TS_SIGUSR2}, |
8895 | {NULL, TS_EXITMENU} |
62638676 |
8896 | }; |
8897 | static const struct telnet_special specials_end[] = { |
6f2d0cde |
8898 | {NULL, TS_EXITMENU} |
62638676 |
8899 | }; |
786ba75e |
8900 | /* XXX review this length for any changes: */ |
8901 | static struct telnet_special ssh_specials[lenof(ssh2_transport_specials) + |
62638676 |
8902 | lenof(ssh2_session_specials) + |
8903 | lenof(specials_end)]; |
125105d1 |
8904 | Ssh ssh = (Ssh) handle; |
62638676 |
8905 | int i = 0; |
8906 | #define ADD_SPECIALS(name) \ |
8907 | do { \ |
8908 | assert((i + lenof(name)) <= lenof(ssh_specials)); \ |
8909 | memcpy(&ssh_specials[i], name, sizeof name); \ |
8910 | i += lenof(name); \ |
8911 | } while(0) |
125105d1 |
8912 | |
8913 | if (ssh->version == 1) { |
62638676 |
8914 | /* Don't bother offering IGNORE if we've decided the remote |
8915 | * won't cope with it, since we wouldn't bother sending it if |
8916 | * asked anyway. */ |
8917 | if (!(ssh->remote_bugs & BUG_CHOKES_ON_SSH1_IGNORE)) |
786ba75e |
8918 | ADD_SPECIALS(ssh1_ignore_special); |
125105d1 |
8919 | } else if (ssh->version == 2) { |
786ba75e |
8920 | ADD_SPECIALS(ssh2_transport_specials); |
62638676 |
8921 | if (ssh->mainchan) |
8922 | ADD_SPECIALS(ssh2_session_specials); |
8923 | } /* else we're not ready yet */ |
8924 | |
8925 | if (i) { |
8926 | ADD_SPECIALS(specials_end); |
8927 | return ssh_specials; |
8928 | } else { |
125105d1 |
8929 | return NULL; |
62638676 |
8930 | } |
8931 | #undef ADD_SPECIALS |
125105d1 |
8932 | } |
8933 | |
8934 | /* |
86dc445a |
8935 | * Send special codes. TS_EOF is useful for `plink', so you |
6abbf9e3 |
8936 | * can send an EOF and collect resulting output (e.g. `plink |
8937 | * hostname sort'). |
374330e2 |
8938 | */ |
51470298 |
8939 | static void ssh_special(void *handle, Telnet_Special code) |
32874aea |
8940 | { |
51470298 |
8941 | Ssh ssh = (Ssh) handle; |
ff3187f6 |
8942 | struct Packet *pktout; |
51470298 |
8943 | |
6abbf9e3 |
8944 | if (code == TS_EOF) { |
51470298 |
8945 | if (ssh->state != SSH_STATE_SESSION) { |
32874aea |
8946 | /* |
8947 | * Buffer the EOF in case we are pre-SESSION, so we can |
8948 | * send it as soon as we reach SESSION. |
8949 | */ |
8950 | if (code == TS_EOF) |
51470298 |
8951 | ssh->eof_needed = TRUE; |
32874aea |
8952 | return; |
8953 | } |
51470298 |
8954 | if (ssh->version == 1) { |
8955 | send_packet(ssh, SSH1_CMSG_EOF, PKT_END); |
0ed48730 |
8956 | } else if (ssh->mainchan) { |
ff3187f6 |
8957 | struct Packet *pktout = ssh2_pkt_init(SSH2_MSG_CHANNEL_EOF); |
8958 | ssh2_pkt_adduint32(pktout, ssh->mainchan->remoteid); |
8959 | ssh2_pkt_send(ssh, pktout); |
00a0b113 |
8960 | ssh->send_ok = 0; /* now stop trying to read from stdin */ |
32874aea |
8961 | } |
8962 | logevent("Sent EOF message"); |
125105d1 |
8963 | } else if (code == TS_PING || code == TS_NOP) { |
51470298 |
8964 | if (ssh->state == SSH_STATE_CLOSED |
8965 | || ssh->state == SSH_STATE_PREPACKET) return; |
8966 | if (ssh->version == 1) { |
8967 | if (!(ssh->remote_bugs & BUG_CHOKES_ON_SSH1_IGNORE)) |
8968 | send_packet(ssh, SSH1_MSG_IGNORE, PKT_STR, "", PKT_END); |
32874aea |
8969 | } else { |
ff3187f6 |
8970 | pktout = ssh2_pkt_init(SSH2_MSG_IGNORE); |
8971 | ssh2_pkt_addstring_start(pktout); |
590f6a5f |
8972 | ssh2_pkt_send_noqueue(ssh, pktout); |
32874aea |
8973 | } |
9442dd57 |
8974 | } else if (code == TS_REKEY) { |
8975 | if (!ssh->kex_in_progress && ssh->version == 2) { |
f382c87d |
8976 | do_ssh2_transport(ssh, "at user request", -1, NULL); |
9442dd57 |
8977 | } |
125105d1 |
8978 | } else if (code == TS_BRK) { |
8979 | if (ssh->state == SSH_STATE_CLOSED |
8980 | || ssh->state == SSH_STATE_PREPACKET) return; |
8981 | if (ssh->version == 1) { |
2e85c969 |
8982 | logevent("Unable to send BREAK signal in SSH-1"); |
0ed48730 |
8983 | } else if (ssh->mainchan) { |
ff3187f6 |
8984 | pktout = ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST); |
8985 | ssh2_pkt_adduint32(pktout, ssh->mainchan->remoteid); |
8986 | ssh2_pkt_addstring(pktout, "break"); |
8987 | ssh2_pkt_addbool(pktout, 0); |
8988 | ssh2_pkt_adduint32(pktout, 0); /* default break length */ |
8989 | ssh2_pkt_send(ssh, pktout); |
125105d1 |
8990 | } |
6abbf9e3 |
8991 | } else { |
6f2d0cde |
8992 | /* Is is a POSIX signal? */ |
8993 | char *signame = NULL; |
8994 | if (code == TS_SIGABRT) signame = "ABRT"; |
8995 | if (code == TS_SIGALRM) signame = "ALRM"; |
8996 | if (code == TS_SIGFPE) signame = "FPE"; |
8997 | if (code == TS_SIGHUP) signame = "HUP"; |
8998 | if (code == TS_SIGILL) signame = "ILL"; |
8999 | if (code == TS_SIGINT) signame = "INT"; |
9000 | if (code == TS_SIGKILL) signame = "KILL"; |
9001 | if (code == TS_SIGPIPE) signame = "PIPE"; |
9002 | if (code == TS_SIGQUIT) signame = "QUIT"; |
9003 | if (code == TS_SIGSEGV) signame = "SEGV"; |
9004 | if (code == TS_SIGTERM) signame = "TERM"; |
9005 | if (code == TS_SIGUSR1) signame = "USR1"; |
9006 | if (code == TS_SIGUSR2) signame = "USR2"; |
9007 | /* The SSH-2 protocol does in principle support arbitrary named |
9008 | * signals, including signame@domain, but we don't support those. */ |
9009 | if (signame) { |
9010 | /* It's a signal. */ |
9011 | if (ssh->version == 2 && ssh->mainchan) { |
ff3187f6 |
9012 | pktout = ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST); |
9013 | ssh2_pkt_adduint32(pktout, ssh->mainchan->remoteid); |
9014 | ssh2_pkt_addstring(pktout, "signal"); |
9015 | ssh2_pkt_addbool(pktout, 0); |
9016 | ssh2_pkt_addstring(pktout, signame); |
9017 | ssh2_pkt_send(ssh, pktout); |
6f2d0cde |
9018 | logeventf(ssh, "Sent signal SIG%s", signame); |
9019 | } |
9020 | } else { |
9021 | /* Never heard of it. Do nothing */ |
9022 | } |
6abbf9e3 |
9023 | } |
374330e2 |
9024 | } |
9025 | |
51470298 |
9026 | void *new_sock_channel(void *handle, Socket s) |
d74d141c |
9027 | { |
51470298 |
9028 | Ssh ssh = (Ssh) handle; |
d74d141c |
9029 | struct ssh_channel *c; |
3d88e64d |
9030 | c = snew(struct ssh_channel); |
51470298 |
9031 | c->ssh = ssh; |
d74d141c |
9032 | |
9033 | if (c) { |
64d6ff88 |
9034 | c->halfopen = TRUE; |
51470298 |
9035 | c->localid = alloc_channel_id(ssh); |
d74d141c |
9036 | c->closes = 0; |
bc240b21 |
9037 | c->type = CHAN_SOCKDATA_DORMANT;/* identify channel type */ |
d74d141c |
9038 | c->u.pfd.s = s; |
013dd8c0 |
9039 | bufchain_init(&c->v.v2.outbuffer); |
51470298 |
9040 | add234(ssh->channels, c); |
d74d141c |
9041 | } |
9042 | return c; |
9043 | } |
9044 | |
5471d09a |
9045 | /* |
9046 | * This is called when stdout/stderr (the entity to which |
9047 | * from_backend sends data) manages to clear some backlog. |
9048 | */ |
ae9ae89f |
9049 | static void ssh_unthrottle(void *handle, int bufsize) |
5471d09a |
9050 | { |
51470298 |
9051 | Ssh ssh = (Ssh) handle; |
9052 | if (ssh->version == 1) { |
9053 | if (ssh->v1_stdout_throttling && bufsize < SSH1_BUFFER_LIMIT) { |
9054 | ssh->v1_stdout_throttling = 0; |
9055 | ssh1_throttle(ssh, -1); |
5471d09a |
9056 | } |
9057 | } else { |
f5c578b0 |
9058 | ssh2_set_window(ssh->mainchan, OUR_V2_WINSIZE - bufsize); |
5471d09a |
9059 | } |
9060 | } |
9061 | |
6b78788a |
9062 | void ssh_send_port_open(void *channel, char *hostname, int port, char *org) |
d74d141c |
9063 | { |
9064 | struct ssh_channel *c = (struct ssh_channel *)channel; |
6b78788a |
9065 | Ssh ssh = c->ssh; |
ff3187f6 |
9066 | struct Packet *pktout; |
d74d141c |
9067 | |
57356d63 |
9068 | logeventf(ssh, "Opening forwarded connection to %s:%d", hostname, port); |
d74d141c |
9069 | |
51470298 |
9070 | if (ssh->version == 1) { |
9071 | send_packet(ssh, SSH1_MSG_PORT_OPEN, |
bc240b21 |
9072 | PKT_INT, c->localid, |
9073 | PKT_STR, hostname, |
9074 | PKT_INT, port, |
31fb1866 |
9075 | /* PKT_STR, <org:orgport>, */ |
bc240b21 |
9076 | PKT_END); |
9077 | } else { |
ff3187f6 |
9078 | pktout = ssh2_pkt_init(SSH2_MSG_CHANNEL_OPEN); |
9079 | ssh2_pkt_addstring(pktout, "direct-tcpip"); |
9080 | ssh2_pkt_adduint32(pktout, c->localid); |
5471d09a |
9081 | c->v.v2.locwindow = OUR_V2_WINSIZE; |
ff3187f6 |
9082 | ssh2_pkt_adduint32(pktout, c->v.v2.locwindow);/* our window size */ |
954d5c5a |
9083 | ssh2_pkt_adduint32(pktout, OUR_V2_MAXPKT); /* our max pkt size */ |
ff3187f6 |
9084 | ssh2_pkt_addstring(pktout, hostname); |
9085 | ssh2_pkt_adduint32(pktout, port); |
bc240b21 |
9086 | /* |
9087 | * We make up values for the originator data; partly it's |
9088 | * too much hassle to keep track, and partly I'm not |
9089 | * convinced the server should be told details like that |
9090 | * about my local network configuration. |
1f182589 |
9091 | * The "originator IP address" is syntactically a numeric |
9092 | * IP address, and some servers (e.g., Tectia) get upset |
9093 | * if it doesn't match this syntax. |
bc240b21 |
9094 | */ |
1f182589 |
9095 | ssh2_pkt_addstring(pktout, "0.0.0.0"); |
ff3187f6 |
9096 | ssh2_pkt_adduint32(pktout, 0); |
9097 | ssh2_pkt_send(ssh, pktout); |
bc240b21 |
9098 | } |
d74d141c |
9099 | } |
9100 | |
6226c939 |
9101 | static int ssh_connected(void *handle) |
32874aea |
9102 | { |
51470298 |
9103 | Ssh ssh = (Ssh) handle; |
6226c939 |
9104 | return ssh->s != NULL; |
32874aea |
9105 | } |
8ccc75b0 |
9106 | |
51470298 |
9107 | static int ssh_sendok(void *handle) |
32874aea |
9108 | { |
51470298 |
9109 | Ssh ssh = (Ssh) handle; |
9110 | return ssh->send_ok; |
32874aea |
9111 | } |
fb09bf1c |
9112 | |
51470298 |
9113 | static int ssh_ldisc(void *handle, int option) |
32874aea |
9114 | { |
51470298 |
9115 | Ssh ssh = (Ssh) handle; |
32874aea |
9116 | if (option == LD_ECHO) |
51470298 |
9117 | return ssh->echoing; |
32874aea |
9118 | if (option == LD_EDIT) |
51470298 |
9119 | return ssh->editing; |
0965bee0 |
9120 | return FALSE; |
9121 | } |
9122 | |
b9d7bcad |
9123 | static void ssh_provide_ldisc(void *handle, void *ldisc) |
9124 | { |
9125 | Ssh ssh = (Ssh) handle; |
9126 | ssh->ldisc = ldisc; |
9127 | } |
9128 | |
a8327734 |
9129 | static void ssh_provide_logctx(void *handle, void *logctx) |
9130 | { |
9131 | Ssh ssh = (Ssh) handle; |
9132 | ssh->logctx = logctx; |
9133 | } |
9134 | |
51470298 |
9135 | static int ssh_return_exitcode(void *handle) |
9136 | { |
9137 | Ssh ssh = (Ssh) handle; |
3bb2f322 |
9138 | if (ssh->s != NULL) |
9139 | return -1; |
9140 | else |
3c112d53 |
9141 | return (ssh->exitcode >= 0 ? ssh->exitcode : INT_MAX); |
51470298 |
9142 | } |
9143 | |
9144 | /* |
f89c3294 |
9145 | * cfg_info for SSH is the currently running version of the |
9146 | * protocol. (1 for 1; 2 for 2; 0 for not-decided-yet.) |
9147 | */ |
9148 | static int ssh_cfg_info(void *handle) |
9149 | { |
9150 | Ssh ssh = (Ssh) handle; |
9151 | return ssh->version; |
9152 | } |
9153 | |
9154 | /* |
51470298 |
9155 | * Gross hack: pscp will try to start SFTP but fall back to scp1 if |
9156 | * that fails. This variable is the means by which scp.c can reach |
9157 | * into the SSH code and find out which one it got. |
9158 | */ |
9159 | extern int ssh_fallback_cmd(void *handle) |
d8d6c7e5 |
9160 | { |
51470298 |
9161 | Ssh ssh = (Ssh) handle; |
9162 | return ssh->fallback_cmd; |
d8d6c7e5 |
9163 | } |
9164 | |
374330e2 |
9165 | Backend ssh_backend = { |
9166 | ssh_init, |
fabd1805 |
9167 | ssh_free, |
86916870 |
9168 | ssh_reconfig, |
374330e2 |
9169 | ssh_send, |
5471d09a |
9170 | ssh_sendbuffer, |
374330e2 |
9171 | ssh_size, |
4017be6d |
9172 | ssh_special, |
125105d1 |
9173 | ssh_get_specials, |
6226c939 |
9174 | ssh_connected, |
d8d6c7e5 |
9175 | ssh_return_exitcode, |
97db3be4 |
9176 | ssh_sendok, |
0965bee0 |
9177 | ssh_ldisc, |
b9d7bcad |
9178 | ssh_provide_ldisc, |
a8327734 |
9179 | ssh_provide_logctx, |
5471d09a |
9180 | ssh_unthrottle, |
f89c3294 |
9181 | ssh_cfg_info, |
9e164d82 |
9182 | "ssh", |
9183 | PROT_SSH, |
97db3be4 |
9184 | 22 |
bc240b21 |
9185 | }; |