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1 | #include <windows.h> |
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2 | #include <stdio.h> |
3 | #include <stdlib.h> |
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4 | #include <stdarg.h> |
5 | #include <assert.h> |
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6 | |
7 | #include "putty.h" |
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8 | #include "tree234.h" |
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9 | #include "ssh.h" |
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10 | |
11 | #ifndef FALSE |
12 | #define FALSE 0 |
13 | #endif |
14 | #ifndef TRUE |
15 | #define TRUE 1 |
16 | #endif |
17 | |
765c4200 |
18 | /* uncomment this for packet level debugging */ |
19 | /* #define DUMP_PACKETS */ |
20 | |
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21 | #define logevent(s) { logevent(s); \ |
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22 | if ((flags & FLAG_STDERR) && (flags & FLAG_VERBOSE)) \ |
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23 | { fprintf(stderr, "%s\n", s); fflush(stderr); } } |
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24 | |
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25 | #define bombout(msg) ( ssh_state = SSH_STATE_CLOSED, \ |
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26 | (s ? sk_close(s), s = NULL : 0), \ |
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27 | connection_fatal msg ) |
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28 | |
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29 | #define SSH1_MSG_DISCONNECT 1 /* 0x1 */ |
30 | #define SSH1_SMSG_PUBLIC_KEY 2 /* 0x2 */ |
31 | #define SSH1_CMSG_SESSION_KEY 3 /* 0x3 */ |
32 | #define SSH1_CMSG_USER 4 /* 0x4 */ |
33 | #define SSH1_CMSG_AUTH_RSA 6 /* 0x6 */ |
34 | #define SSH1_SMSG_AUTH_RSA_CHALLENGE 7 /* 0x7 */ |
35 | #define SSH1_CMSG_AUTH_RSA_RESPONSE 8 /* 0x8 */ |
36 | #define SSH1_CMSG_AUTH_PASSWORD 9 /* 0x9 */ |
37 | #define SSH1_CMSG_REQUEST_PTY 10 /* 0xa */ |
38 | #define SSH1_CMSG_WINDOW_SIZE 11 /* 0xb */ |
39 | #define SSH1_CMSG_EXEC_SHELL 12 /* 0xc */ |
40 | #define SSH1_CMSG_EXEC_CMD 13 /* 0xd */ |
41 | #define SSH1_SMSG_SUCCESS 14 /* 0xe */ |
42 | #define SSH1_SMSG_FAILURE 15 /* 0xf */ |
43 | #define SSH1_CMSG_STDIN_DATA 16 /* 0x10 */ |
44 | #define SSH1_SMSG_STDOUT_DATA 17 /* 0x11 */ |
45 | #define SSH1_SMSG_STDERR_DATA 18 /* 0x12 */ |
46 | #define SSH1_CMSG_EOF 19 /* 0x13 */ |
47 | #define SSH1_SMSG_EXIT_STATUS 20 /* 0x14 */ |
48 | #define SSH1_MSG_CHANNEL_OPEN_CONFIRMATION 21 /* 0x15 */ |
49 | #define SSH1_MSG_CHANNEL_OPEN_FAILURE 22 /* 0x16 */ |
50 | #define SSH1_MSG_CHANNEL_DATA 23 /* 0x17 */ |
51 | #define SSH1_MSG_CHANNEL_CLOSE 24 /* 0x18 */ |
52 | #define SSH1_MSG_CHANNEL_CLOSE_CONFIRMATION 25 /* 0x19 */ |
53 | #define SSH1_SMSG_X11_OPEN 27 /* 0x1b */ |
54 | #define SSH1_CMSG_PORT_FORWARD_REQUEST 28 /* 0x1c */ |
55 | #define SSH1_MSG_PORT_OPEN 29 /* 0x1d */ |
56 | #define SSH1_CMSG_AGENT_REQUEST_FORWARDING 30 /* 0x1e */ |
57 | #define SSH1_SMSG_AGENT_OPEN 31 /* 0x1f */ |
58 | #define SSH1_MSG_IGNORE 32 /* 0x20 */ |
59 | #define SSH1_CMSG_EXIT_CONFIRMATION 33 /* 0x21 */ |
60 | #define SSH1_CMSG_X11_REQUEST_FORWARDING 34 /* 0x22 */ |
61 | #define SSH1_CMSG_AUTH_RHOSTS_RSA 35 /* 0x23 */ |
62 | #define SSH1_MSG_DEBUG 36 /* 0x24 */ |
63 | #define SSH1_CMSG_REQUEST_COMPRESSION 37 /* 0x25 */ |
64 | #define SSH1_CMSG_AUTH_TIS 39 /* 0x27 */ |
65 | #define SSH1_SMSG_AUTH_TIS_CHALLENGE 40 /* 0x28 */ |
66 | #define SSH1_CMSG_AUTH_TIS_RESPONSE 41 /* 0x29 */ |
67 | #define SSH1_CMSG_AUTH_CCARD 70 /* 0x46 */ |
68 | #define SSH1_SMSG_AUTH_CCARD_CHALLENGE 71 /* 0x47 */ |
69 | #define SSH1_CMSG_AUTH_CCARD_RESPONSE 72 /* 0x48 */ |
70 | |
71 | #define SSH1_AUTH_TIS 5 /* 0x5 */ |
72 | #define SSH1_AUTH_CCARD 16 /* 0x10 */ |
73 | |
74 | #define SSH1_PROTOFLAG_SCREEN_NUMBER 1 /* 0x1 */ |
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75 | /* Mask for protoflags we will echo back to server if seen */ |
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76 | #define SSH1_PROTOFLAGS_SUPPORTED 0 /* 0x1 */ |
77 | |
78 | #define SSH2_MSG_DISCONNECT 1 /* 0x1 */ |
79 | #define SSH2_MSG_IGNORE 2 /* 0x2 */ |
80 | #define SSH2_MSG_UNIMPLEMENTED 3 /* 0x3 */ |
81 | #define SSH2_MSG_DEBUG 4 /* 0x4 */ |
82 | #define SSH2_MSG_SERVICE_REQUEST 5 /* 0x5 */ |
83 | #define SSH2_MSG_SERVICE_ACCEPT 6 /* 0x6 */ |
84 | #define SSH2_MSG_KEXINIT 20 /* 0x14 */ |
85 | #define SSH2_MSG_NEWKEYS 21 /* 0x15 */ |
86 | #define SSH2_MSG_KEXDH_INIT 30 /* 0x1e */ |
87 | #define SSH2_MSG_KEXDH_REPLY 31 /* 0x1f */ |
88 | #define SSH2_MSG_KEX_DH_GEX_REQUEST 30 /* 0x1e */ |
89 | #define SSH2_MSG_KEX_DH_GEX_GROUP 31 /* 0x1f */ |
90 | #define SSH2_MSG_KEX_DH_GEX_INIT 32 /* 0x20 */ |
91 | #define SSH2_MSG_KEX_DH_GEX_REPLY 33 /* 0x21 */ |
92 | #define SSH2_MSG_USERAUTH_REQUEST 50 /* 0x32 */ |
93 | #define SSH2_MSG_USERAUTH_FAILURE 51 /* 0x33 */ |
94 | #define SSH2_MSG_USERAUTH_SUCCESS 52 /* 0x34 */ |
95 | #define SSH2_MSG_USERAUTH_BANNER 53 /* 0x35 */ |
96 | #define SSH2_MSG_USERAUTH_PK_OK 60 /* 0x3c */ |
97 | #define SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ 60 /* 0x3c */ |
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98 | #define SSH2_MSG_USERAUTH_INFO_REQUEST 60 /* 0x3c */ |
99 | #define SSH2_MSG_USERAUTH_INFO_RESPONSE 61 /* 0x3d */ |
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100 | #define SSH2_MSG_GLOBAL_REQUEST 80 /* 0x50 */ |
101 | #define SSH2_MSG_REQUEST_SUCCESS 81 /* 0x51 */ |
102 | #define SSH2_MSG_REQUEST_FAILURE 82 /* 0x52 */ |
103 | #define SSH2_MSG_CHANNEL_OPEN 90 /* 0x5a */ |
104 | #define SSH2_MSG_CHANNEL_OPEN_CONFIRMATION 91 /* 0x5b */ |
105 | #define SSH2_MSG_CHANNEL_OPEN_FAILURE 92 /* 0x5c */ |
106 | #define SSH2_MSG_CHANNEL_WINDOW_ADJUST 93 /* 0x5d */ |
107 | #define SSH2_MSG_CHANNEL_DATA 94 /* 0x5e */ |
108 | #define SSH2_MSG_CHANNEL_EXTENDED_DATA 95 /* 0x5f */ |
109 | #define SSH2_MSG_CHANNEL_EOF 96 /* 0x60 */ |
110 | #define SSH2_MSG_CHANNEL_CLOSE 97 /* 0x61 */ |
111 | #define SSH2_MSG_CHANNEL_REQUEST 98 /* 0x62 */ |
112 | #define SSH2_MSG_CHANNEL_SUCCESS 99 /* 0x63 */ |
113 | #define SSH2_MSG_CHANNEL_FAILURE 100 /* 0x64 */ |
114 | |
115 | #define SSH2_DISCONNECT_HOST_NOT_ALLOWED_TO_CONNECT 1 /* 0x1 */ |
116 | #define SSH2_DISCONNECT_PROTOCOL_ERROR 2 /* 0x2 */ |
117 | #define SSH2_DISCONNECT_KEY_EXCHANGE_FAILED 3 /* 0x3 */ |
118 | #define SSH2_DISCONNECT_HOST_AUTHENTICATION_FAILED 4 /* 0x4 */ |
119 | #define SSH2_DISCONNECT_MAC_ERROR 5 /* 0x5 */ |
120 | #define SSH2_DISCONNECT_COMPRESSION_ERROR 6 /* 0x6 */ |
121 | #define SSH2_DISCONNECT_SERVICE_NOT_AVAILABLE 7 /* 0x7 */ |
122 | #define SSH2_DISCONNECT_PROTOCOL_VERSION_NOT_SUPPORTED 8 /* 0x8 */ |
123 | #define SSH2_DISCONNECT_HOST_KEY_NOT_VERIFIABLE 9 /* 0x9 */ |
124 | #define SSH2_DISCONNECT_CONNECTION_LOST 10 /* 0xa */ |
125 | #define SSH2_DISCONNECT_BY_APPLICATION 11 /* 0xb */ |
126 | #define SSH2_DISCONNECT_TOO_MANY_CONNECTIONS 12 /* 0xc */ |
127 | #define SSH2_DISCONNECT_AUTH_CANCELLED_BY_USER 13 /* 0xd */ |
128 | #define SSH2_DISCONNECT_NO_MORE_AUTH_METHODS_AVAILABLE 14 /* 0xe */ |
129 | #define SSH2_DISCONNECT_ILLEGAL_USER_NAME 15 /* 0xf */ |
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130 | |
131 | static const char *const ssh2_disconnect_reasons[] = { |
132 | NULL, |
133 | "SSH_DISCONNECT_HOST_NOT_ALLOWED_TO_CONNECT", |
134 | "SSH_DISCONNECT_PROTOCOL_ERROR", |
135 | "SSH_DISCONNECT_KEY_EXCHANGE_FAILED", |
136 | "SSH_DISCONNECT_HOST_AUTHENTICATION_FAILED", |
137 | "SSH_DISCONNECT_MAC_ERROR", |
138 | "SSH_DISCONNECT_COMPRESSION_ERROR", |
139 | "SSH_DISCONNECT_SERVICE_NOT_AVAILABLE", |
140 | "SSH_DISCONNECT_PROTOCOL_VERSION_NOT_SUPPORTED", |
141 | "SSH_DISCONNECT_HOST_KEY_NOT_VERIFIABLE", |
142 | "SSH_DISCONNECT_CONNECTION_LOST", |
143 | "SSH_DISCONNECT_BY_APPLICATION", |
144 | "SSH_DISCONNECT_TOO_MANY_CONNECTIONS", |
145 | "SSH_DISCONNECT_AUTH_CANCELLED_BY_USER", |
146 | "SSH_DISCONNECT_NO_MORE_AUTH_METHODS_AVAILABLE", |
147 | "SSH_DISCONNECT_ILLEGAL_USER_NAME", |
148 | }; |
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149 | |
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150 | #define SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED 1 /* 0x1 */ |
151 | #define SSH2_OPEN_CONNECT_FAILED 2 /* 0x2 */ |
152 | #define SSH2_OPEN_UNKNOWN_CHANNEL_TYPE 3 /* 0x3 */ |
153 | #define SSH2_OPEN_RESOURCE_SHORTAGE 4 /* 0x4 */ |
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154 | |
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155 | #define SSH2_EXTENDED_DATA_STDERR 1 /* 0x1 */ |
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156 | |
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157 | /* |
158 | * Various remote-bug flags. |
159 | */ |
160 | #define BUG_CHOKES_ON_SSH1_IGNORE 1 |
161 | #define BUG_SSH2_HMAC 2 |
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162 | #define BUG_NEEDS_SSH1_PLAIN_PASSWORD 4 |
163 | |
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164 | |
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165 | #define GET_32BIT(cp) \ |
166 | (((unsigned long)(unsigned char)(cp)[0] << 24) | \ |
167 | ((unsigned long)(unsigned char)(cp)[1] << 16) | \ |
168 | ((unsigned long)(unsigned char)(cp)[2] << 8) | \ |
169 | ((unsigned long)(unsigned char)(cp)[3])) |
170 | |
171 | #define PUT_32BIT(cp, value) { \ |
172 | (cp)[0] = (unsigned char)((value) >> 24); \ |
173 | (cp)[1] = (unsigned char)((value) >> 16); \ |
174 | (cp)[2] = (unsigned char)((value) >> 8); \ |
175 | (cp)[3] = (unsigned char)(value); } |
176 | |
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177 | enum { PKT_END, PKT_INT, PKT_CHAR, PKT_DATA, PKT_STR, PKT_BIGNUM }; |
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178 | |
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179 | /* Coroutine mechanics for the sillier bits of the code */ |
180 | #define crBegin1 static int crLine = 0; |
181 | #define crBegin2 switch(crLine) { case 0:; |
182 | #define crBegin crBegin1; crBegin2; |
183 | #define crFinish(z) } crLine = 0; return (z) |
184 | #define crFinishV } crLine = 0; return |
185 | #define crReturn(z) \ |
186 | do {\ |
187 | crLine=__LINE__; return (z); case __LINE__:;\ |
188 | } while (0) |
189 | #define crReturnV \ |
190 | do {\ |
191 | crLine=__LINE__; return; case __LINE__:;\ |
192 | } while (0) |
193 | #define crStop(z) do{ crLine = 0; return (z); }while(0) |
194 | #define crStopV do{ crLine = 0; return; }while(0) |
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195 | #define crWaitUntil(c) do { crReturn(0); } while (!(c)) |
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196 | #define crWaitUntilV(c) do { crReturnV; } while (!(c)) |
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197 | |
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198 | extern char *x11_init(Socket *, char *, void *); |
199 | extern void x11_close(Socket); |
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200 | extern int x11_send(Socket, char *, int); |
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201 | extern void x11_invent_auth(char *, int, char *, int); |
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202 | extern void x11_unthrottle(Socket s); |
203 | extern void x11_override_throttle(Socket s, int enable); |
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204 | |
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205 | extern char *pfd_newconnect(Socket * s, char *hostname, int port, void *c); |
206 | extern char *pfd_addforward(char *desthost, int destport, int port); |
207 | extern void pfd_close(Socket s); |
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208 | extern int pfd_send(Socket s, char *data, int len); |
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209 | extern void pfd_confirm(Socket s); |
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210 | extern void pfd_unthrottle(Socket s); |
211 | extern void pfd_override_throttle(Socket s, int enable); |
212 | |
213 | /* |
214 | * Buffer management constants. There are several of these for |
215 | * various different purposes: |
216 | * |
217 | * - SSH1_BUFFER_LIMIT is the amount of backlog that must build up |
218 | * on a local data stream before we throttle the whole SSH |
219 | * connection (in SSH1 only). Throttling the whole connection is |
220 | * pretty drastic so we set this high in the hope it won't |
221 | * happen very often. |
222 | * |
223 | * - SSH_MAX_BACKLOG is the amount of backlog that must build up |
224 | * on the SSH connection itself before we defensively throttle |
225 | * _all_ local data streams. This is pretty drastic too (though |
226 | * thankfully unlikely in SSH2 since the window mechanism should |
227 | * ensure that the server never has any need to throttle its end |
228 | * of the connection), so we set this high as well. |
229 | * |
230 | * - OUR_V2_WINSIZE is the maximum window size we present on SSH2 |
231 | * channels. |
232 | */ |
233 | |
234 | #define SSH1_BUFFER_LIMIT 32768 |
235 | #define SSH_MAX_BACKLOG 32768 |
236 | #define OUR_V2_WINSIZE 16384 |
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237 | |
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238 | /* |
239 | * Ciphers for SSH2. We miss out single-DES because it isn't |
240 | * supported; also 3DES and Blowfish are both done differently from |
241 | * SSH1. (3DES uses outer chaining; Blowfish has the opposite |
242 | * endianness and different-sized keys.) |
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243 | */ |
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244 | const static struct ssh2_ciphers *ciphers[] = { |
245 | &ssh2_aes, |
246 | &ssh2_blowfish, |
247 | &ssh2_3des, |
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248 | }; |
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249 | |
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250 | const static struct ssh_kex *kex_algs[] = { |
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251 | &ssh_diffiehellman_gex, |
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252 | &ssh_diffiehellman |
253 | }; |
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254 | |
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255 | const static struct ssh_signkey *hostkey_algs[] = { &ssh_rsa, &ssh_dss }; |
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256 | |
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257 | static void nullmac_key(unsigned char *key) |
258 | { |
259 | } |
260 | static void nullmac_generate(unsigned char *blk, int len, |
261 | unsigned long seq) |
262 | { |
263 | } |
264 | static int nullmac_verify(unsigned char *blk, int len, unsigned long seq) |
265 | { |
266 | return 1; |
267 | } |
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268 | const static struct ssh_mac ssh_mac_none = { |
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269 | nullmac_key, nullmac_key, nullmac_generate, nullmac_verify, "none", 0 |
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270 | }; |
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271 | const static struct ssh_mac *macs[] = { |
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272 | &ssh_sha1, &ssh_md5, &ssh_mac_none |
273 | }; |
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274 | const static struct ssh_mac *buggymacs[] = { |
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275 | &ssh_sha1_buggy, &ssh_md5, &ssh_mac_none |
276 | }; |
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277 | |
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278 | static void ssh_comp_none_init(void) |
279 | { |
280 | } |
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281 | static int ssh_comp_none_block(unsigned char *block, int len, |
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282 | unsigned char **outblock, int *outlen) |
283 | { |
284 | return 0; |
285 | } |
286 | static int ssh_comp_none_disable(void) |
287 | { |
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288 | return 0; |
289 | } |
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290 | const static struct ssh_compress ssh_comp_none = { |
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291 | "none", |
292 | ssh_comp_none_init, ssh_comp_none_block, |
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293 | ssh_comp_none_init, ssh_comp_none_block, |
294 | ssh_comp_none_disable |
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295 | }; |
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296 | extern const struct ssh_compress ssh_zlib; |
297 | const static struct ssh_compress *compressions[] = { |
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298 | &ssh_zlib, &ssh_comp_none |
299 | }; |
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300 | |
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301 | enum { /* channel types */ |
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302 | CHAN_MAINSESSION, |
303 | CHAN_X11, |
304 | CHAN_AGENT, |
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305 | CHAN_SOCKDATA, |
306 | CHAN_SOCKDATA_DORMANT /* one the remote hasn't confirmed */ |
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307 | }; |
308 | |
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309 | /* |
310 | * 2-3-4 tree storing channels. |
311 | */ |
312 | struct ssh_channel { |
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313 | unsigned remoteid, localid; |
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314 | int type; |
315 | int closes; |
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316 | union { |
317 | struct ssh1_data_channel { |
318 | int throttling; |
319 | } v1; |
320 | struct ssh2_data_channel { |
321 | bufchain outbuffer; |
322 | unsigned remwindow, remmaxpkt; |
323 | unsigned locwindow; |
324 | } v2; |
325 | } v; |
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326 | union { |
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327 | struct ssh_agent_channel { |
328 | unsigned char *message; |
329 | unsigned char msglen[4]; |
330 | int lensofar, totallen; |
331 | } a; |
332 | struct ssh_x11_channel { |
333 | Socket s; |
334 | } x11; |
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335 | struct ssh_pfd_channel { |
336 | Socket s; |
337 | } pfd; |
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338 | } u; |
339 | }; |
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340 | |
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341 | /* |
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342 | * 2-3-4 tree storing remote->local port forwardings. SSH 1 and SSH |
343 | * 2 use this structure in different ways, reflecting SSH 2's |
344 | * altogether saner approach to port forwarding. |
345 | * |
346 | * In SSH 1, you arrange a remote forwarding by sending the server |
347 | * the remote port number, and the local destination host:port. |
348 | * When a connection comes in, the server sends you back that |
349 | * host:port pair, and you connect to it. This is a ready-made |
350 | * security hole if you're not on the ball: a malicious server |
351 | * could send you back _any_ host:port pair, so if you trustingly |
352 | * connect to the address it gives you then you've just opened the |
353 | * entire inside of your corporate network just by connecting |
354 | * through it to a dodgy SSH server. Hence, we must store a list of |
355 | * host:port pairs we _are_ trying to forward to, and reject a |
356 | * connection request from the server if it's not in the list. |
357 | * |
358 | * In SSH 2, each side of the connection minds its own business and |
359 | * doesn't send unnecessary information to the other. You arrange a |
360 | * remote forwarding by sending the server just the remote port |
361 | * number. When a connection comes in, the server tells you which |
362 | * of its ports was connected to; and _you_ have to remember what |
363 | * local host:port pair went with that port number. |
364 | * |
365 | * Hence: in SSH 1 this structure stores host:port pairs we intend |
366 | * to allow connections to, and is indexed by those host:port |
367 | * pairs. In SSH 2 it stores a mapping from source port to |
368 | * destination host:port pair, and is indexed by source port. |
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369 | */ |
370 | struct ssh_rportfwd { |
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371 | unsigned sport, dport; |
372 | char dhost[256]; |
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373 | }; |
374 | |
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375 | struct Packet { |
376 | long length; |
377 | int type; |
378 | unsigned char *data; |
379 | unsigned char *body; |
380 | long savedpos; |
381 | long maxlen; |
382 | }; |
383 | |
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384 | static SHA_State exhash, exhashbase; |
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385 | |
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386 | static Socket s = NULL; |
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387 | |
388 | static unsigned char session_key[32]; |
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389 | static int ssh1_compressing; |
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390 | static int ssh1_remote_protoflags; |
391 | static int ssh1_local_protoflags; |
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392 | static int ssh_agentfwd_enabled; |
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393 | static int ssh_X11_fwd_enabled; |
7d503c31 |
394 | static int ssh_remote_bugs; |
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395 | static const struct ssh_cipher *cipher = NULL; |
0a3f1d48 |
396 | static const struct ssh2_cipher *cscipher = NULL; |
397 | static const struct ssh2_cipher *sccipher = NULL; |
57476f6b |
398 | static const struct ssh_mac *csmac = NULL; |
399 | static const struct ssh_mac *scmac = NULL; |
400 | static const struct ssh_compress *cscomp = NULL; |
401 | static const struct ssh_compress *sccomp = NULL; |
402 | static const struct ssh_kex *kex = NULL; |
e055a386 |
403 | static const struct ssh_signkey *hostkey = NULL; |
65a22376 |
404 | static unsigned char ssh2_session_id[20]; |
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405 | int (*ssh_get_line) (const char *prompt, char *str, int maxlen, |
406 | int is_pw) = NULL; |
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407 | |
408 | static char *savedhost; |
409 | static int savedport; |
410 | static int ssh_send_ok; |
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411 | static int ssh_echoing, ssh_editing; |
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412 | |
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413 | static tree234 *ssh_channels; /* indexed by local id */ |
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414 | static struct ssh_channel *mainchan; /* primary session channel */ |
415 | |
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416 | static tree234 *ssh_rportfwds; |
417 | |
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418 | static enum { |
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419 | SSH_STATE_PREPACKET, |
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420 | SSH_STATE_BEFORE_SIZE, |
421 | SSH_STATE_INTERMED, |
422 | SSH_STATE_SESSION, |
423 | SSH_STATE_CLOSED |
3687d221 |
424 | } ssh_state = SSH_STATE_PREPACKET; |
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425 | |
3687d221 |
426 | static int size_needed = FALSE, eof_needed = FALSE; |
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427 | |
428 | static struct Packet pktin = { 0, 0, NULL, NULL, 0 }; |
429 | static struct Packet pktout = { 0, 0, NULL, NULL, 0 }; |
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430 | static unsigned char *deferred_send_data = NULL; |
431 | static int deferred_len = 0, deferred_size = 0; |
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432 | |
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433 | /* |
434 | * Gross hack: pscp will try to start SFTP but fall back to scp1 if |
435 | * that fails. This variable is the means by which scp.c can reach |
436 | * into the SSH code and find out which one it got. |
437 | */ |
438 | int ssh_fallback_cmd = 0; |
439 | |
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440 | static int ssh_version; |
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441 | static int ssh1_throttle_count; |
442 | static int ssh_overall_bufsize; |
443 | static int ssh_throttled_all; |
444 | static int ssh1_stdout_throttling; |
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445 | static void (*ssh_protocol) (unsigned char *in, int inlen, int ispkt); |
57476f6b |
446 | static void ssh1_protocol(unsigned char *in, int inlen, int ispkt); |
447 | static void ssh2_protocol(unsigned char *in, int inlen, int ispkt); |
448 | static void ssh_size(void); |
32874aea |
449 | static void ssh_special(Telnet_Special); |
5471d09a |
450 | static int ssh2_try_send(struct ssh_channel *c); |
32874aea |
451 | static void ssh2_add_channel_data(struct ssh_channel *c, char *buf, |
452 | int len); |
5471d09a |
453 | static void ssh_throttle_all(int enable, int bufsize); |
454 | static void ssh2_set_window(struct ssh_channel *c, unsigned newwin); |
32874aea |
455 | static int (*s_rdpkt) (unsigned char **data, int *datalen); |
5471d09a |
456 | static int ssh_sendbuffer(void); |
57476f6b |
457 | |
458 | static struct rdpkt1_state_tag { |
459 | long len, pad, biglen, to_read; |
460 | unsigned long realcrc, gotcrc; |
461 | unsigned char *p; |
462 | int i; |
463 | int chunk; |
464 | } rdpkt1_state; |
465 | |
960e736a |
466 | static struct rdpkt2_state_tag { |
467 | long len, pad, payload, packetlen, maclen; |
468 | int i; |
469 | int cipherblk; |
470 | unsigned long incoming_sequence; |
471 | } rdpkt2_state; |
472 | |
32874aea |
473 | static int ssh_channelcmp(void *av, void *bv) |
474 | { |
475 | struct ssh_channel *a = (struct ssh_channel *) av; |
476 | struct ssh_channel *b = (struct ssh_channel *) bv; |
477 | if (a->localid < b->localid) |
478 | return -1; |
479 | if (a->localid > b->localid) |
480 | return +1; |
dacbd0e8 |
481 | return 0; |
482 | } |
32874aea |
483 | static int ssh_channelfind(void *av, void *bv) |
484 | { |
485 | unsigned *a = (unsigned *) av; |
486 | struct ssh_channel *b = (struct ssh_channel *) bv; |
487 | if (*a < b->localid) |
488 | return -1; |
489 | if (*a > b->localid) |
490 | return +1; |
dacbd0e8 |
491 | return 0; |
492 | } |
493 | |
bc240b21 |
494 | static int ssh_rportcmp_ssh1(void *av, void *bv) |
d74d141c |
495 | { |
496 | struct ssh_rportfwd *a = (struct ssh_rportfwd *) av; |
497 | struct ssh_rportfwd *b = (struct ssh_rportfwd *) bv; |
498 | int i; |
bc240b21 |
499 | if ( (i = strcmp(a->dhost, b->dhost)) != 0) |
d74d141c |
500 | return i < 0 ? -1 : +1; |
bc240b21 |
501 | if (a->dport > b->dport) |
502 | return +1; |
503 | if (a->dport < b->dport) |
504 | return -1; |
505 | return 0; |
506 | } |
507 | |
508 | static int ssh_rportcmp_ssh2(void *av, void *bv) |
509 | { |
510 | struct ssh_rportfwd *a = (struct ssh_rportfwd *) av; |
511 | struct ssh_rportfwd *b = (struct ssh_rportfwd *) bv; |
cdcbdf3b |
512 | |
bc240b21 |
513 | if (a->sport > b->sport) |
d74d141c |
514 | return +1; |
bc240b21 |
515 | if (a->sport < b->sport) |
516 | return -1; |
d74d141c |
517 | return 0; |
518 | } |
519 | |
32874aea |
520 | static int alloc_channel_id(void) |
521 | { |
260f3dec |
522 | const unsigned CHANNEL_NUMBER_OFFSET = 256; |
523 | unsigned low, high, mid; |
d2371c81 |
524 | int tsize; |
525 | struct ssh_channel *c; |
526 | |
527 | /* |
528 | * First-fit allocation of channel numbers: always pick the |
529 | * lowest unused one. To do this, binary-search using the |
530 | * counted B-tree to find the largest channel ID which is in a |
531 | * contiguous sequence from the beginning. (Precisely |
532 | * everything in that sequence must have ID equal to its tree |
533 | * index plus CHANNEL_NUMBER_OFFSET.) |
534 | */ |
535 | tsize = count234(ssh_channels); |
536 | |
32874aea |
537 | low = -1; |
538 | high = tsize; |
d2371c81 |
539 | while (high - low > 1) { |
540 | mid = (high + low) / 2; |
541 | c = index234(ssh_channels, mid); |
542 | if (c->localid == mid + CHANNEL_NUMBER_OFFSET) |
543 | low = mid; /* this one is fine */ |
544 | else |
545 | high = mid; /* this one is past it */ |
546 | } |
547 | /* |
548 | * Now low points to either -1, or the tree index of the |
549 | * largest ID in the initial sequence. |
550 | */ |
551 | { |
552 | unsigned i = low + 1 + CHANNEL_NUMBER_OFFSET; |
553 | assert(NULL == find234(ssh_channels, &i, ssh_channelfind)); |
554 | } |
555 | return low + 1 + CHANNEL_NUMBER_OFFSET; |
556 | } |
557 | |
32874aea |
558 | static void c_write(char *buf, int len) |
559 | { |
67779be7 |
560 | if ((flags & FLAG_STDERR)) { |
32874aea |
561 | int i; |
562 | for (i = 0; i < len; i++) |
563 | if (buf[i] != '\r') |
564 | fputc(buf[i], stderr); |
fb09bf1c |
565 | return; |
566 | } |
fe50e814 |
567 | from_backend(1, buf, len); |
3bdaf79d |
568 | } |
569 | |
32874aea |
570 | static void c_write_untrusted(char *buf, int len) |
571 | { |
a209e957 |
572 | int i; |
573 | for (i = 0; i < len; i++) { |
32874aea |
574 | if (buf[i] == '\n') |
575 | c_write("\r\n", 2); |
576 | else if ((buf[i] & 0x60) || (buf[i] == '\r')) |
577 | c_write(buf + i, 1); |
a209e957 |
578 | } |
579 | } |
580 | |
32874aea |
581 | static void c_write_str(char *buf) |
582 | { |
1408a877 |
583 | c_write(buf, strlen(buf)); |
584 | } |
585 | |
fb09bf1c |
586 | /* |
587 | * Collect incoming data in the incoming packet buffer. |
e5574168 |
588 | * Decipher and verify the packet when it is completely read. |
589 | * Drop SSH1_MSG_DEBUG and SSH1_MSG_IGNORE packets. |
fb09bf1c |
590 | * Update the *data and *datalen variables. |
591 | * Return the additional nr of bytes needed, or 0 when |
592 | * a complete packet is available. |
593 | */ |
e5574168 |
594 | static int ssh1_rdpkt(unsigned char **data, int *datalen) |
fb09bf1c |
595 | { |
57476f6b |
596 | struct rdpkt1_state_tag *st = &rdpkt1_state; |
374330e2 |
597 | |
598 | crBegin; |
374330e2 |
599 | |
32874aea |
600 | next_packet: |
37508af4 |
601 | |
fb09bf1c |
602 | pktin.type = 0; |
603 | pktin.length = 0; |
374330e2 |
604 | |
57476f6b |
605 | for (st->i = st->len = 0; st->i < 4; st->i++) { |
fb09bf1c |
606 | while ((*datalen) == 0) |
32874aea |
607 | crReturn(4 - st->i); |
57476f6b |
608 | st->len = (st->len << 8) + **data; |
fb09bf1c |
609 | (*data)++, (*datalen)--; |
610 | } |
374330e2 |
611 | |
57476f6b |
612 | st->pad = 8 - (st->len % 8); |
613 | st->biglen = st->len + st->pad; |
614 | pktin.length = st->len - 5; |
fb09bf1c |
615 | |
57476f6b |
616 | if (pktin.maxlen < st->biglen) { |
617 | pktin.maxlen = st->biglen; |
32874aea |
618 | pktin.data = (pktin.data == NULL ? smalloc(st->biglen + APIEXTRA) : |
619 | srealloc(pktin.data, st->biglen + APIEXTRA)); |
fb09bf1c |
620 | if (!pktin.data) |
621 | fatalbox("Out of memory"); |
622 | } |
374330e2 |
623 | |
57476f6b |
624 | st->to_read = st->biglen; |
625 | st->p = pktin.data; |
626 | while (st->to_read > 0) { |
32874aea |
627 | st->chunk = st->to_read; |
fb09bf1c |
628 | while ((*datalen) == 0) |
57476f6b |
629 | crReturn(st->to_read); |
630 | if (st->chunk > (*datalen)) |
631 | st->chunk = (*datalen); |
632 | memcpy(st->p, *data, st->chunk); |
633 | *data += st->chunk; |
634 | *datalen -= st->chunk; |
635 | st->p += st->chunk; |
636 | st->to_read -= st->chunk; |
fb09bf1c |
637 | } |
374330e2 |
638 | |
fb09bf1c |
639 | if (cipher) |
57476f6b |
640 | cipher->decrypt(pktin.data, st->biglen); |
765c4200 |
641 | #ifdef DUMP_PACKETS |
642 | debug(("Got packet len=%d pad=%d\n", st->len, st->pad)); |
643 | dmemdump(pktin.data, st->biglen); |
698a5108 |
644 | #endif |
374330e2 |
645 | |
32874aea |
646 | st->realcrc = crc32(pktin.data, st->biglen - 4); |
647 | st->gotcrc = GET_32BIT(pktin.data + st->biglen - 4); |
57476f6b |
648 | if (st->gotcrc != st->realcrc) { |
8d5de777 |
649 | bombout(("Incorrect CRC received on packet")); |
32874aea |
650 | crReturn(0); |
fb09bf1c |
651 | } |
572f871e |
652 | |
4ba9b64b |
653 | pktin.body = pktin.data + st->pad + 1; |
654 | |
655 | if (ssh1_compressing) { |
656 | unsigned char *decompblk; |
657 | int decomplen; |
765c4200 |
658 | #ifdef DUMP_PACKETS |
659 | debug(("Packet payload pre-decompression:\n")); |
32874aea |
660 | dmemdump(pktin.body - 1, pktin.length + 1); |
4ba9b64b |
661 | #endif |
32874aea |
662 | zlib_decompress_block(pktin.body - 1, pktin.length + 1, |
4ba9b64b |
663 | &decompblk, &decomplen); |
664 | |
665 | if (pktin.maxlen < st->pad + decomplen) { |
666 | pktin.maxlen = st->pad + decomplen; |
32874aea |
667 | pktin.data = srealloc(pktin.data, pktin.maxlen + APIEXTRA); |
668 | pktin.body = pktin.data + st->pad + 1; |
4ba9b64b |
669 | if (!pktin.data) |
670 | fatalbox("Out of memory"); |
671 | } |
672 | |
32874aea |
673 | memcpy(pktin.body - 1, decompblk, decomplen); |
dcbde236 |
674 | sfree(decompblk); |
32874aea |
675 | pktin.length = decomplen - 1; |
765c4200 |
676 | #ifdef DUMP_PACKETS |
677 | debug(("Packet payload post-decompression:\n")); |
32874aea |
678 | dmemdump(pktin.body - 1, pktin.length + 1); |
4ba9b64b |
679 | #endif |
680 | } |
681 | |
e5574168 |
682 | if (pktin.type == SSH1_SMSG_STDOUT_DATA || |
32874aea |
683 | pktin.type == SSH1_SMSG_STDERR_DATA || |
684 | pktin.type == SSH1_MSG_DEBUG || |
685 | pktin.type == SSH1_SMSG_AUTH_TIS_CHALLENGE || |
686 | pktin.type == SSH1_SMSG_AUTH_CCARD_CHALLENGE) { |
fb09bf1c |
687 | long strlen = GET_32BIT(pktin.body); |
8d5de777 |
688 | if (strlen + 4 != pktin.length) { |
689 | bombout(("Received data packet with bogus string length")); |
32874aea |
690 | crReturn(0); |
691 | } |
fb09bf1c |
692 | } |
693 | |
4ba9b64b |
694 | pktin.type = pktin.body[-1]; |
695 | |
e5574168 |
696 | if (pktin.type == SSH1_MSG_DEBUG) { |
fb09bf1c |
697 | /* log debug message */ |
698 | char buf[80]; |
699 | int strlen = GET_32BIT(pktin.body); |
700 | strcpy(buf, "Remote: "); |
32874aea |
701 | if (strlen > 70) |
702 | strlen = 70; |
703 | memcpy(buf + 8, pktin.body + 4, strlen); |
704 | buf[8 + strlen] = '\0'; |
fb09bf1c |
705 | logevent(buf); |
706 | goto next_packet; |
e5574168 |
707 | } else if (pktin.type == SSH1_MSG_IGNORE) { |
fb09bf1c |
708 | /* do nothing */ |
709 | goto next_packet; |
710 | } |
711 | |
38c4a8da |
712 | if (pktin.type == SSH1_MSG_DISCONNECT) { |
713 | /* log reason code in disconnect message */ |
714 | char buf[256]; |
260f3dec |
715 | unsigned msglen = GET_32BIT(pktin.body); |
716 | unsigned nowlen; |
38c4a8da |
717 | strcpy(buf, "Remote sent disconnect: "); |
718 | nowlen = strlen(buf); |
32874aea |
719 | if (msglen > sizeof(buf) - nowlen - 1) |
720 | msglen = sizeof(buf) - nowlen - 1; |
721 | memcpy(buf + nowlen, pktin.body + 4, msglen); |
722 | buf[nowlen + msglen] = '\0'; |
38c4a8da |
723 | logevent(buf); |
4eb195cc |
724 | bombout(("Server sent disconnect message:\n\"%s\"", buf+nowlen)); |
e14d0f19 |
725 | crReturn(0); |
38c4a8da |
726 | } |
727 | |
fb09bf1c |
728 | crFinish(0); |
729 | } |
730 | |
e5574168 |
731 | static int ssh2_rdpkt(unsigned char **data, int *datalen) |
732 | { |
960e736a |
733 | struct rdpkt2_state_tag *st = &rdpkt2_state; |
e5574168 |
734 | |
735 | crBegin; |
736 | |
32874aea |
737 | next_packet: |
e5574168 |
738 | pktin.type = 0; |
739 | pktin.length = 0; |
960e736a |
740 | if (sccipher) |
32874aea |
741 | st->cipherblk = sccipher->blksize; |
e5574168 |
742 | else |
32874aea |
743 | st->cipherblk = 8; |
960e736a |
744 | if (st->cipherblk < 8) |
32874aea |
745 | st->cipherblk = 8; |
960e736a |
746 | |
747 | if (pktin.maxlen < st->cipherblk) { |
748 | pktin.maxlen = st->cipherblk; |
32874aea |
749 | pktin.data = |
750 | (pktin.data == |
751 | NULL ? smalloc(st->cipherblk + |
752 | APIEXTRA) : srealloc(pktin.data, |
753 | st->cipherblk + |
754 | APIEXTRA)); |
e5574168 |
755 | if (!pktin.data) |
756 | fatalbox("Out of memory"); |
757 | } |
758 | |
759 | /* |
760 | * Acquire and decrypt the first block of the packet. This will |
761 | * contain the length and padding details. |
762 | */ |
32874aea |
763 | for (st->i = st->len = 0; st->i < st->cipherblk; st->i++) { |
e5574168 |
764 | while ((*datalen) == 0) |
32874aea |
765 | crReturn(st->cipherblk - st->i); |
960e736a |
766 | pktin.data[st->i] = *(*data)++; |
32874aea |
767 | (*datalen)--; |
e5574168 |
768 | } |
4252c9cc |
769 | |
e5574168 |
770 | if (sccipher) |
32874aea |
771 | sccipher->decrypt(pktin.data, st->cipherblk); |
e5574168 |
772 | |
773 | /* |
774 | * Now get the length and padding figures. |
775 | */ |
960e736a |
776 | st->len = GET_32BIT(pktin.data); |
777 | st->pad = pktin.data[4]; |
e5574168 |
778 | |
779 | /* |
780 | * This enables us to deduce the payload length. |
781 | */ |
960e736a |
782 | st->payload = st->len - st->pad - 1; |
e5574168 |
783 | |
960e736a |
784 | pktin.length = st->payload + 5; |
e5574168 |
785 | |
786 | /* |
787 | * So now we can work out the total packet length. |
788 | */ |
960e736a |
789 | st->packetlen = st->len + 4; |
790 | st->maclen = scmac ? scmac->len : 0; |
e5574168 |
791 | |
792 | /* |
793 | * Adjust memory allocation if packet is too big. |
794 | */ |
32874aea |
795 | if (pktin.maxlen < st->packetlen + st->maclen) { |
796 | pktin.maxlen = st->packetlen + st->maclen; |
797 | pktin.data = |
798 | (pktin.data == |
799 | NULL ? smalloc(pktin.maxlen + APIEXTRA) : srealloc(pktin.data, |
800 | pktin.maxlen |
801 | + |
802 | APIEXTRA)); |
e5574168 |
803 | if (!pktin.data) |
804 | fatalbox("Out of memory"); |
805 | } |
806 | |
807 | /* |
808 | * Read and decrypt the remainder of the packet. |
809 | */ |
32874aea |
810 | for (st->i = st->cipherblk; st->i < st->packetlen + st->maclen; |
811 | st->i++) { |
e5574168 |
812 | while ((*datalen) == 0) |
960e736a |
813 | crReturn(st->packetlen + st->maclen - st->i); |
814 | pktin.data[st->i] = *(*data)++; |
32874aea |
815 | (*datalen)--; |
e5574168 |
816 | } |
817 | /* Decrypt everything _except_ the MAC. */ |
818 | if (sccipher) |
32874aea |
819 | sccipher->decrypt(pktin.data + st->cipherblk, |
820 | st->packetlen - st->cipherblk); |
e5574168 |
821 | |
765c4200 |
822 | #ifdef DUMP_PACKETS |
823 | debug(("Got packet len=%d pad=%d\n", st->len, st->pad)); |
824 | dmemdump(pktin.data, st->packetlen); |
7cca0d81 |
825 | #endif |
d39f364a |
826 | |
e5574168 |
827 | /* |
828 | * Check the MAC. |
829 | */ |
32874aea |
830 | if (scmac |
831 | && !scmac->verify(pktin.data, st->len + 4, |
832 | st->incoming_sequence)) { |
8d5de777 |
833 | bombout(("Incorrect MAC received on packet")); |
32874aea |
834 | crReturn(0); |
8d5de777 |
835 | } |
32874aea |
836 | st->incoming_sequence++; /* whether or not we MACed */ |
e5574168 |
837 | |
4ba9b64b |
838 | /* |
839 | * Decompress packet payload. |
840 | */ |
841 | { |
842 | unsigned char *newpayload; |
843 | int newlen; |
32874aea |
844 | if (sccomp && sccomp->decompress(pktin.data + 5, pktin.length - 5, |
4ba9b64b |
845 | &newpayload, &newlen)) { |
32874aea |
846 | if (pktin.maxlen < newlen + 5) { |
847 | pktin.maxlen = newlen + 5; |
848 | pktin.data = |
849 | (pktin.data == |
850 | NULL ? smalloc(pktin.maxlen + |
851 | APIEXTRA) : srealloc(pktin.data, |
852 | pktin.maxlen + |
853 | APIEXTRA)); |
4ba9b64b |
854 | if (!pktin.data) |
855 | fatalbox("Out of memory"); |
856 | } |
857 | pktin.length = 5 + newlen; |
32874aea |
858 | memcpy(pktin.data + 5, newpayload, newlen); |
765c4200 |
859 | #ifdef DUMP_PACKETS |
860 | debug(("Post-decompression payload:\n")); |
32874aea |
861 | dmemdump(pktin.data + 5, newlen); |
4ba9b64b |
862 | #endif |
863 | |
dcbde236 |
864 | sfree(newpayload); |
4ba9b64b |
865 | } |
866 | } |
867 | |
e5574168 |
868 | pktin.savedpos = 6; |
869 | pktin.type = pktin.data[5]; |
e5574168 |
870 | |
7cca0d81 |
871 | if (pktin.type == SSH2_MSG_IGNORE || pktin.type == SSH2_MSG_DEBUG) |
32874aea |
872 | goto next_packet; /* FIXME: print DEBUG message */ |
e5574168 |
873 | |
38c4a8da |
874 | if (pktin.type == SSH2_MSG_DISCONNECT) { |
875 | /* log reason code in disconnect message */ |
876 | char buf[256]; |
32874aea |
877 | int reason = GET_32BIT(pktin.data + 6); |
878 | unsigned msglen = GET_32BIT(pktin.data + 10); |
260f3dec |
879 | unsigned nowlen; |
38c4a8da |
880 | if (reason > 0 && reason < lenof(ssh2_disconnect_reasons)) { |
881 | sprintf(buf, "Received disconnect message (%s)", |
882 | ssh2_disconnect_reasons[reason]); |
883 | } else { |
32874aea |
884 | sprintf(buf, "Received disconnect message (unknown type %d)", |
885 | reason); |
38c4a8da |
886 | } |
887 | logevent(buf); |
888 | strcpy(buf, "Disconnection message text: "); |
889 | nowlen = strlen(buf); |
32874aea |
890 | if (msglen > sizeof(buf) - nowlen - 1) |
891 | msglen = sizeof(buf) - nowlen - 1; |
892 | memcpy(buf + nowlen, pktin.data + 14, msglen); |
893 | buf[nowlen + msglen] = '\0'; |
38c4a8da |
894 | logevent(buf); |
4eb195cc |
895 | bombout(("Server sent disconnect message\ntype %d (%s):\n\"%s\"", |
896 | reason, |
897 | (reason > 0 && reason < lenof(ssh2_disconnect_reasons)) ? |
898 | ssh2_disconnect_reasons[reason] : "unknown", |
899 | buf+nowlen)); |
e14d0f19 |
900 | crReturn(0); |
38c4a8da |
901 | } |
902 | |
e5574168 |
903 | crFinish(0); |
904 | } |
905 | |
32874aea |
906 | static void ssh1_pktout_size(int len) |
907 | { |
374330e2 |
908 | int pad, biglen; |
909 | |
910 | len += 5; /* type and CRC */ |
32874aea |
911 | pad = 8 - (len % 8); |
374330e2 |
912 | biglen = len + pad; |
913 | |
32874aea |
914 | pktout.length = len - 5; |
374330e2 |
915 | if (pktout.maxlen < biglen) { |
916 | pktout.maxlen = biglen; |
8f203108 |
917 | #ifdef MSCRYPTOAPI |
fb09bf1c |
918 | /* Allocate enough buffer space for extra block |
8f203108 |
919 | * for MS CryptEncrypt() */ |
32874aea |
920 | pktout.data = (pktout.data == NULL ? smalloc(biglen + 12) : |
921 | srealloc(pktout.data, biglen + 12)); |
8f203108 |
922 | #else |
32874aea |
923 | pktout.data = (pktout.data == NULL ? smalloc(biglen + 4) : |
924 | srealloc(pktout.data, biglen + 4)); |
8f203108 |
925 | #endif |
374330e2 |
926 | if (!pktout.data) |
927 | fatalbox("Out of memory"); |
928 | } |
32874aea |
929 | pktout.body = pktout.data + 4 + pad + 1; |
4ba9b64b |
930 | } |
374330e2 |
931 | |
32874aea |
932 | static void s_wrpkt_start(int type, int len) |
933 | { |
4ba9b64b |
934 | ssh1_pktout_size(len); |
374330e2 |
935 | pktout.type = type; |
374330e2 |
936 | } |
937 | |
32874aea |
938 | static int s_wrpkt_prepare(void) |
939 | { |
374330e2 |
940 | int pad, len, biglen, i; |
941 | unsigned long crc; |
942 | |
4ba9b64b |
943 | pktout.body[-1] = pktout.type; |
944 | |
945 | if (ssh1_compressing) { |
946 | unsigned char *compblk; |
947 | int complen; |
ca35e638 |
948 | #ifdef DUMP_PACKETS |
949 | debug(("Packet payload pre-compression:\n")); |
950 | dmemdump(pktout.body - 1, pktout.length + 1); |
951 | #endif |
32874aea |
952 | zlib_compress_block(pktout.body - 1, pktout.length + 1, |
4ba9b64b |
953 | &compblk, &complen); |
32874aea |
954 | ssh1_pktout_size(complen - 1); |
955 | memcpy(pktout.body - 1, compblk, complen); |
dcbde236 |
956 | sfree(compblk); |
4ba9b64b |
957 | } |
958 | |
374330e2 |
959 | len = pktout.length + 5; /* type and CRC */ |
32874aea |
960 | pad = 8 - (len % 8); |
374330e2 |
961 | biglen = len + pad; |
962 | |
32874aea |
963 | for (i = 0; i < pad; i++) |
964 | pktout.data[i + 4] = random_byte(); |
965 | crc = crc32(pktout.data + 4, biglen - 4); |
966 | PUT_32BIT(pktout.data + biglen, crc); |
fb09bf1c |
967 | PUT_32BIT(pktout.data, len); |
374330e2 |
968 | |
765c4200 |
969 | #ifdef DUMP_PACKETS |
32874aea |
970 | debug(("Sending packet len=%d\n", biglen + 4)); |
971 | dmemdump(pktout.data, biglen + 4); |
698a5108 |
972 | #endif |
374330e2 |
973 | if (cipher) |
32874aea |
974 | cipher->encrypt(pktout.data + 4, biglen); |
374330e2 |
975 | |
32874aea |
976 | return biglen + 4; |
39065bed |
977 | } |
978 | |
32874aea |
979 | static void s_wrpkt(void) |
980 | { |
5471d09a |
981 | int len, backlog; |
39065bed |
982 | len = s_wrpkt_prepare(); |
5471d09a |
983 | backlog = sk_write(s, pktout.data, len); |
984 | if (backlog > SSH_MAX_BACKLOG) |
985 | ssh_throttle_all(1, backlog); |
39065bed |
986 | } |
987 | |
32874aea |
988 | static void s_wrpkt_defer(void) |
989 | { |
39065bed |
990 | int len; |
991 | len = s_wrpkt_prepare(); |
992 | if (deferred_len + len > deferred_size) { |
32874aea |
993 | deferred_size = deferred_len + len + 128; |
994 | deferred_send_data = srealloc(deferred_send_data, deferred_size); |
39065bed |
995 | } |
32874aea |
996 | memcpy(deferred_send_data + deferred_len, pktout.data, len); |
39065bed |
997 | deferred_len += len; |
374330e2 |
998 | } |
999 | |
fb09bf1c |
1000 | /* |
39065bed |
1001 | * Construct a packet with the specified contents. |
fb09bf1c |
1002 | */ |
39065bed |
1003 | static void construct_packet(int pkttype, va_list ap1, va_list ap2) |
fb09bf1c |
1004 | { |
fb09bf1c |
1005 | unsigned char *p, *argp, argchar; |
1006 | unsigned long argint; |
1007 | int pktlen, argtype, arglen; |
7cca0d81 |
1008 | Bignum bn; |
fb09bf1c |
1009 | |
1010 | pktlen = 0; |
39065bed |
1011 | while ((argtype = va_arg(ap1, int)) != PKT_END) { |
fb09bf1c |
1012 | switch (argtype) { |
1013 | case PKT_INT: |
39065bed |
1014 | (void) va_arg(ap1, int); |
fb09bf1c |
1015 | pktlen += 4; |
1016 | break; |
1017 | case PKT_CHAR: |
39065bed |
1018 | (void) va_arg(ap1, char); |
fb09bf1c |
1019 | pktlen++; |
1020 | break; |
1021 | case PKT_DATA: |
39065bed |
1022 | (void) va_arg(ap1, unsigned char *); |
1023 | arglen = va_arg(ap1, int); |
fb09bf1c |
1024 | pktlen += arglen; |
1025 | break; |
1026 | case PKT_STR: |
39065bed |
1027 | argp = va_arg(ap1, unsigned char *); |
fb09bf1c |
1028 | arglen = strlen(argp); |
1029 | pktlen += 4 + arglen; |
1030 | break; |
7cca0d81 |
1031 | case PKT_BIGNUM: |
39065bed |
1032 | bn = va_arg(ap1, Bignum); |
32874aea |
1033 | pktlen += ssh1_bignum_length(bn); |
7cca0d81 |
1034 | break; |
fb09bf1c |
1035 | default: |
1036 | assert(0); |
1037 | } |
1038 | } |
fb09bf1c |
1039 | |
1040 | s_wrpkt_start(pkttype, pktlen); |
1041 | p = pktout.body; |
1042 | |
39065bed |
1043 | while ((argtype = va_arg(ap2, int)) != PKT_END) { |
fb09bf1c |
1044 | switch (argtype) { |
1045 | case PKT_INT: |
39065bed |
1046 | argint = va_arg(ap2, int); |
fb09bf1c |
1047 | PUT_32BIT(p, argint); |
1048 | p += 4; |
1049 | break; |
1050 | case PKT_CHAR: |
39065bed |
1051 | argchar = va_arg(ap2, unsigned char); |
fb09bf1c |
1052 | *p = argchar; |
1053 | p++; |
1054 | break; |
1055 | case PKT_DATA: |
39065bed |
1056 | argp = va_arg(ap2, unsigned char *); |
1057 | arglen = va_arg(ap2, int); |
fb09bf1c |
1058 | memcpy(p, argp, arglen); |
1059 | p += arglen; |
1060 | break; |
1061 | case PKT_STR: |
39065bed |
1062 | argp = va_arg(ap2, unsigned char *); |
fb09bf1c |
1063 | arglen = strlen(argp); |
1064 | PUT_32BIT(p, arglen); |
1065 | memcpy(p + 4, argp, arglen); |
1066 | p += 4 + arglen; |
1067 | break; |
7cca0d81 |
1068 | case PKT_BIGNUM: |
39065bed |
1069 | bn = va_arg(ap2, Bignum); |
32874aea |
1070 | p += ssh1_write_bignum(p, bn); |
7cca0d81 |
1071 | break; |
fb09bf1c |
1072 | } |
1073 | } |
39065bed |
1074 | } |
fb09bf1c |
1075 | |
32874aea |
1076 | static void send_packet(int pkttype, ...) |
1077 | { |
39065bed |
1078 | va_list ap1, ap2; |
1079 | va_start(ap1, pkttype); |
1080 | va_start(ap2, pkttype); |
1081 | construct_packet(pkttype, ap1, ap2); |
fb09bf1c |
1082 | s_wrpkt(); |
1083 | } |
1084 | |
32874aea |
1085 | static void defer_packet(int pkttype, ...) |
1086 | { |
39065bed |
1087 | va_list ap1, ap2; |
1088 | va_start(ap1, pkttype); |
1089 | va_start(ap2, pkttype); |
1090 | construct_packet(pkttype, ap1, ap2); |
1091 | s_wrpkt_defer(); |
1092 | } |
1093 | |
32874aea |
1094 | static int ssh_versioncmp(char *a, char *b) |
1095 | { |
9697bfd2 |
1096 | char *ae, *be; |
1097 | unsigned long av, bv; |
1098 | |
43aa02a7 |
1099 | av = strtoul(a, &ae, 10); |
1100 | bv = strtoul(b, &be, 10); |
32874aea |
1101 | if (av != bv) |
1102 | return (av < bv ? -1 : +1); |
1103 | if (*ae == '.') |
1104 | ae++; |
1105 | if (*be == '.') |
1106 | be++; |
43aa02a7 |
1107 | av = strtoul(ae, &ae, 10); |
1108 | bv = strtoul(be, &be, 10); |
32874aea |
1109 | if (av != bv) |
1110 | return (av < bv ? -1 : +1); |
9697bfd2 |
1111 | return 0; |
1112 | } |
1113 | |
e5574168 |
1114 | |
1115 | /* |
a92dd380 |
1116 | * Utility routines for putting an SSH-protocol `string' and |
1117 | * `uint32' into a SHA state. |
e5574168 |
1118 | */ |
1119 | #include <stdio.h> |
32874aea |
1120 | static void sha_string(SHA_State * s, void *str, int len) |
1121 | { |
e5574168 |
1122 | unsigned char lenblk[4]; |
e5574168 |
1123 | PUT_32BIT(lenblk, len); |
e5574168 |
1124 | SHA_Bytes(s, lenblk, 4); |
e5574168 |
1125 | SHA_Bytes(s, str, len); |
1126 | } |
1127 | |
32874aea |
1128 | static void sha_uint32(SHA_State * s, unsigned i) |
1129 | { |
a92dd380 |
1130 | unsigned char intblk[4]; |
1131 | PUT_32BIT(intblk, i); |
1132 | SHA_Bytes(s, intblk, 4); |
1133 | } |
1134 | |
7cca0d81 |
1135 | /* |
1136 | * SSH2 packet construction functions. |
1137 | */ |
32874aea |
1138 | static void ssh2_pkt_ensure(int length) |
1139 | { |
783415f8 |
1140 | if (pktout.maxlen < length) { |
32874aea |
1141 | pktout.maxlen = length + 256; |
1142 | pktout.data = |
1143 | (pktout.data == |
1144 | NULL ? smalloc(pktout.maxlen + |
1145 | APIEXTRA) : srealloc(pktout.data, |
1146 | pktout.maxlen + |
1147 | APIEXTRA)); |
1148 | if (!pktout.data) |
1149 | fatalbox("Out of memory"); |
7cca0d81 |
1150 | } |
783415f8 |
1151 | } |
32874aea |
1152 | static void ssh2_pkt_adddata(void *data, int len) |
1153 | { |
783415f8 |
1154 | pktout.length += len; |
1155 | ssh2_pkt_ensure(pktout.length); |
32874aea |
1156 | memcpy(pktout.data + pktout.length - len, data, len); |
7cca0d81 |
1157 | } |
32874aea |
1158 | static void ssh2_pkt_addbyte(unsigned char byte) |
1159 | { |
7cca0d81 |
1160 | ssh2_pkt_adddata(&byte, 1); |
1161 | } |
32874aea |
1162 | static void ssh2_pkt_init(int pkt_type) |
1163 | { |
7cca0d81 |
1164 | pktout.length = 5; |
32874aea |
1165 | ssh2_pkt_addbyte((unsigned char) pkt_type); |
7cca0d81 |
1166 | } |
32874aea |
1167 | static void ssh2_pkt_addbool(unsigned char value) |
1168 | { |
7cca0d81 |
1169 | ssh2_pkt_adddata(&value, 1); |
1170 | } |
32874aea |
1171 | static void ssh2_pkt_adduint32(unsigned long value) |
1172 | { |
7cca0d81 |
1173 | unsigned char x[4]; |
1174 | PUT_32BIT(x, value); |
1175 | ssh2_pkt_adddata(x, 4); |
1176 | } |
32874aea |
1177 | static void ssh2_pkt_addstring_start(void) |
1178 | { |
7cca0d81 |
1179 | ssh2_pkt_adduint32(0); |
1180 | pktout.savedpos = pktout.length; |
1181 | } |
32874aea |
1182 | static void ssh2_pkt_addstring_str(char *data) |
1183 | { |
7cca0d81 |
1184 | ssh2_pkt_adddata(data, strlen(data)); |
1185 | PUT_32BIT(pktout.data + pktout.savedpos - 4, |
32874aea |
1186 | pktout.length - pktout.savedpos); |
7cca0d81 |
1187 | } |
32874aea |
1188 | static void ssh2_pkt_addstring_data(char *data, int len) |
1189 | { |
7cca0d81 |
1190 | ssh2_pkt_adddata(data, len); |
1191 | PUT_32BIT(pktout.data + pktout.savedpos - 4, |
32874aea |
1192 | pktout.length - pktout.savedpos); |
7cca0d81 |
1193 | } |
32874aea |
1194 | static void ssh2_pkt_addstring(char *data) |
1195 | { |
7cca0d81 |
1196 | ssh2_pkt_addstring_start(); |
1197 | ssh2_pkt_addstring_str(data); |
1198 | } |
32874aea |
1199 | static char *ssh2_mpint_fmt(Bignum b, int *len) |
1200 | { |
7cca0d81 |
1201 | unsigned char *p; |
32874aea |
1202 | int i, n = (bignum_bitcount(b) + 7) / 8; |
3709bfe9 |
1203 | p = smalloc(n + 1); |
7cca0d81 |
1204 | if (!p) |
32874aea |
1205 | fatalbox("out of memory"); |
7cca0d81 |
1206 | p[0] = 0; |
3709bfe9 |
1207 | for (i = 1; i <= n; i++) |
32874aea |
1208 | p[i] = bignum_byte(b, n - i); |
7cca0d81 |
1209 | i = 0; |
32874aea |
1210 | while (i <= n && p[i] == 0 && (p[i + 1] & 0x80) == 0) |
1211 | i++; |
1212 | memmove(p, p + i, n + 1 - i); |
1213 | *len = n + 1 - i; |
7cca0d81 |
1214 | return p; |
1215 | } |
32874aea |
1216 | static void ssh2_pkt_addmp(Bignum b) |
1217 | { |
7cca0d81 |
1218 | unsigned char *p; |
1219 | int len; |
1220 | p = ssh2_mpint_fmt(b, &len); |
1221 | ssh2_pkt_addstring_start(); |
1222 | ssh2_pkt_addstring_data(p, len); |
dcbde236 |
1223 | sfree(p); |
7cca0d81 |
1224 | } |
b185170a |
1225 | |
1226 | /* |
1227 | * Construct an SSH2 final-form packet: compress it, encrypt it, |
1228 | * put the MAC on it. Final packet, ready to be sent, is stored in |
1229 | * pktout.data. Total length is returned. |
1230 | */ |
32874aea |
1231 | static int ssh2_pkt_construct(void) |
1232 | { |
7cca0d81 |
1233 | int cipherblk, maclen, padding, i; |
1234 | static unsigned long outgoing_sequence = 0; |
1235 | |
1236 | /* |
4ba9b64b |
1237 | * Compress packet payload. |
1238 | */ |
4ba9b64b |
1239 | { |
1240 | unsigned char *newpayload; |
1241 | int newlen; |
ca35e638 |
1242 | #ifdef DUMP_PACKETS |
1243 | if (cscomp && cscomp != &ssh_comp_none) { |
1244 | debug(("Pre-compression payload:\n")); |
1245 | dmemdump(pktout.data + 5, pktout.length - 5); |
1246 | } |
1247 | #endif |
32874aea |
1248 | if (cscomp && cscomp->compress(pktout.data + 5, pktout.length - 5, |
4ba9b64b |
1249 | &newpayload, &newlen)) { |
1250 | pktout.length = 5; |
1251 | ssh2_pkt_adddata(newpayload, newlen); |
dcbde236 |
1252 | sfree(newpayload); |
4ba9b64b |
1253 | } |
1254 | } |
1255 | |
1256 | /* |
7cca0d81 |
1257 | * Add padding. At least four bytes, and must also bring total |
1258 | * length (minus MAC) up to a multiple of the block size. |
1259 | */ |
32874aea |
1260 | cipherblk = cscipher ? cscipher->blksize : 8; /* block size */ |
1261 | cipherblk = cipherblk < 8 ? 8 : cipherblk; /* or 8 if blksize < 8 */ |
7cca0d81 |
1262 | padding = 4; |
32874aea |
1263 | padding += |
1264 | (cipherblk - (pktout.length + padding) % cipherblk) % cipherblk; |
783415f8 |
1265 | maclen = csmac ? csmac->len : 0; |
1266 | ssh2_pkt_ensure(pktout.length + padding + maclen); |
7cca0d81 |
1267 | pktout.data[4] = padding; |
1268 | for (i = 0; i < padding; i++) |
32874aea |
1269 | pktout.data[pktout.length + i] = random_byte(); |
7cca0d81 |
1270 | PUT_32BIT(pktout.data, pktout.length + padding - 4); |
1271 | if (csmac) |
32874aea |
1272 | csmac->generate(pktout.data, pktout.length + padding, |
1273 | outgoing_sequence); |
1274 | outgoing_sequence++; /* whether or not we MACed */ |
7cca0d81 |
1275 | |
765c4200 |
1276 | #ifdef DUMP_PACKETS |
32874aea |
1277 | debug(("Sending packet len=%d\n", pktout.length + padding)); |
1278 | dmemdump(pktout.data, pktout.length + padding); |
7cca0d81 |
1279 | #endif |
1280 | |
1281 | if (cscipher) |
32874aea |
1282 | cscipher->encrypt(pktout.data, pktout.length + padding); |
7cca0d81 |
1283 | |
b185170a |
1284 | /* Ready-to-send packet starts at pktout.data. We return length. */ |
1285 | return pktout.length + padding + maclen; |
1286 | } |
1287 | |
1288 | /* |
1289 | * Construct and send an SSH2 packet immediately. |
1290 | */ |
32874aea |
1291 | static void ssh2_pkt_send(void) |
1292 | { |
5471d09a |
1293 | int len; |
1294 | int backlog; |
1295 | len = ssh2_pkt_construct(); |
1296 | backlog = sk_write(s, pktout.data, len); |
1297 | if (backlog > SSH_MAX_BACKLOG) |
1298 | ssh_throttle_all(1, backlog); |
b185170a |
1299 | } |
1300 | |
1301 | /* |
1302 | * Construct an SSH2 packet and add it to a deferred data block. |
1303 | * Useful for sending multiple packets in a single sk_write() call, |
1304 | * to prevent a traffic-analysing listener from being able to work |
1305 | * out the length of any particular packet (such as the password |
1306 | * packet). |
1307 | * |
1308 | * Note that because SSH2 sequence-numbers its packets, this can |
1309 | * NOT be used as an m4-style `defer' allowing packets to be |
1310 | * constructed in one order and sent in another. |
1311 | */ |
32874aea |
1312 | static void ssh2_pkt_defer(void) |
1313 | { |
b185170a |
1314 | int len = ssh2_pkt_construct(); |
1315 | if (deferred_len + len > deferred_size) { |
32874aea |
1316 | deferred_size = deferred_len + len + 128; |
1317 | deferred_send_data = srealloc(deferred_send_data, deferred_size); |
b185170a |
1318 | } |
32874aea |
1319 | memcpy(deferred_send_data + deferred_len, pktout.data, len); |
b185170a |
1320 | deferred_len += len; |
1321 | } |
1322 | |
1323 | /* |
1324 | * Send the whole deferred data block constructed by |
39065bed |
1325 | * ssh2_pkt_defer() or SSH1's defer_packet(). |
b185170a |
1326 | */ |
32874aea |
1327 | static void ssh_pkt_defersend(void) |
1328 | { |
5471d09a |
1329 | int backlog; |
1330 | backlog = sk_write(s, deferred_send_data, deferred_len); |
b185170a |
1331 | deferred_len = deferred_size = 0; |
1332 | sfree(deferred_send_data); |
1333 | deferred_send_data = NULL; |
5471d09a |
1334 | if (backlog > SSH_MAX_BACKLOG) |
1335 | ssh_throttle_all(1, backlog); |
7cca0d81 |
1336 | } |
1337 | |
1338 | #if 0 |
32874aea |
1339 | void bndebug(char *string, Bignum b) |
1340 | { |
7cca0d81 |
1341 | unsigned char *p; |
1342 | int i, len; |
1343 | p = ssh2_mpint_fmt(b, &len); |
1344 | debug(("%s", string)); |
1345 | for (i = 0; i < len; i++) |
32874aea |
1346 | debug((" %02x", p[i])); |
765c4200 |
1347 | debug(("\n")); |
dcbde236 |
1348 | sfree(p); |
7cca0d81 |
1349 | } |
1350 | #endif |
1351 | |
32874aea |
1352 | static void sha_mpint(SHA_State * s, Bignum b) |
1353 | { |
7cca0d81 |
1354 | unsigned char *p; |
1355 | int len; |
1356 | p = ssh2_mpint_fmt(b, &len); |
1357 | sha_string(s, p, len); |
dcbde236 |
1358 | sfree(p); |
7cca0d81 |
1359 | } |
1360 | |
1361 | /* |
1362 | * SSH2 packet decode functions. |
1363 | */ |
32874aea |
1364 | static unsigned long ssh2_pkt_getuint32(void) |
1365 | { |
7cca0d81 |
1366 | unsigned long value; |
1367 | if (pktin.length - pktin.savedpos < 4) |
32874aea |
1368 | return 0; /* arrgh, no way to decline (FIXME?) */ |
1369 | value = GET_32BIT(pktin.data + pktin.savedpos); |
7cca0d81 |
1370 | pktin.savedpos += 4; |
1371 | return value; |
1372 | } |
32874aea |
1373 | static int ssh2_pkt_getbool(void) |
1374 | { |
65a22376 |
1375 | unsigned long value; |
1376 | if (pktin.length - pktin.savedpos < 1) |
32874aea |
1377 | return 0; /* arrgh, no way to decline (FIXME?) */ |
65a22376 |
1378 | value = pktin.data[pktin.savedpos] != 0; |
1379 | pktin.savedpos++; |
1380 | return value; |
1381 | } |
32874aea |
1382 | static void ssh2_pkt_getstring(char **p, int *length) |
1383 | { |
7cca0d81 |
1384 | *p = NULL; |
1385 | if (pktin.length - pktin.savedpos < 4) |
32874aea |
1386 | return; |
1387 | *length = GET_32BIT(pktin.data + pktin.savedpos); |
7cca0d81 |
1388 | pktin.savedpos += 4; |
1389 | if (pktin.length - pktin.savedpos < *length) |
32874aea |
1390 | return; |
1391 | *p = pktin.data + pktin.savedpos; |
7cca0d81 |
1392 | pktin.savedpos += *length; |
1393 | } |
32874aea |
1394 | static Bignum ssh2_pkt_getmp(void) |
1395 | { |
7cca0d81 |
1396 | char *p; |
3709bfe9 |
1397 | int length; |
7cca0d81 |
1398 | Bignum b; |
1399 | |
1400 | ssh2_pkt_getstring(&p, &length); |
1401 | if (!p) |
32874aea |
1402 | return NULL; |
8d5de777 |
1403 | if (p[0] & 0x80) { |
32874aea |
1404 | bombout(("internal error: Can't handle negative mpints")); |
1405 | return NULL; |
8d5de777 |
1406 | } |
3709bfe9 |
1407 | b = bignum_from_bytes(p, length); |
7cca0d81 |
1408 | return b; |
1409 | } |
1410 | |
7d503c31 |
1411 | /* |
1412 | * Examine the remote side's version string and compare it against |
1413 | * a list of known buggy implementations. |
1414 | */ |
32874aea |
1415 | static void ssh_detect_bugs(char *vstring) |
1416 | { |
1417 | char *imp; /* pointer to implementation part */ |
7d503c31 |
1418 | imp = vstring; |
1419 | imp += strcspn(imp, "-"); |
bd358db1 |
1420 | if (*imp) imp++; |
7d503c31 |
1421 | imp += strcspn(imp, "-"); |
bd358db1 |
1422 | if (*imp) imp++; |
7d503c31 |
1423 | |
1424 | ssh_remote_bugs = 0; |
1425 | |
1426 | if (!strcmp(imp, "1.2.18") || !strcmp(imp, "1.2.19") || |
32874aea |
1427 | !strcmp(imp, "1.2.20") || !strcmp(imp, "1.2.21") || |
bd358db1 |
1428 | !strcmp(imp, "1.2.22") || !strcmp(imp, "Cisco-1.25")) { |
32874aea |
1429 | /* |
1430 | * These versions don't support SSH1_MSG_IGNORE, so we have |
1431 | * to use a different defence against password length |
1432 | * sniffing. |
1433 | */ |
1434 | ssh_remote_bugs |= BUG_CHOKES_ON_SSH1_IGNORE; |
1435 | logevent("We believe remote version has SSH1 ignore bug"); |
7d503c31 |
1436 | } |
1437 | |
bd358db1 |
1438 | if (!strcmp(imp, "Cisco-1.25")) { |
1439 | /* |
1440 | * These versions need a plain password sent; they can't |
1441 | * handle having a null and a random length of data after |
1442 | * the password. |
1443 | */ |
1444 | ssh_remote_bugs |= BUG_NEEDS_SSH1_PLAIN_PASSWORD; |
1445 | logevent("We believe remote version needs a plain SSH1 password"); |
1446 | } |
1447 | |
7d503c31 |
1448 | if (!strncmp(imp, "2.1.0", 5) || !strncmp(imp, "2.0.", 4) || |
32874aea |
1449 | !strncmp(imp, "2.2.0", 5) || !strncmp(imp, "2.3.0", 5) || |
1450 | !strncmp(imp, "2.1 ", 4)) { |
1451 | /* |
1452 | * These versions have the HMAC bug. |
1453 | */ |
1454 | ssh_remote_bugs |= BUG_SSH2_HMAC; |
1455 | logevent("We believe remote version has SSH2 HMAC bug"); |
7d503c31 |
1456 | } |
1457 | } |
1458 | |
32874aea |
1459 | static int do_ssh_init(unsigned char c) |
1460 | { |
2d466ffd |
1461 | static int vslen; |
8df7a775 |
1462 | static char version[10]; |
50526e47 |
1463 | static char *vstring; |
1464 | static int vstrsize; |
1465 | static char *vlog; |
8df7a775 |
1466 | static int i; |
374330e2 |
1467 | |
8df7a775 |
1468 | crBegin; |
1469 | |
1470 | /* Search for the string "SSH-" in the input. */ |
374330e2 |
1471 | i = 0; |
8df7a775 |
1472 | while (1) { |
1473 | static const int transS[] = { 1, 2, 2, 1 }; |
1474 | static const int transH[] = { 0, 0, 3, 0 }; |
1475 | static const int transminus[] = { 0, 0, 0, -1 }; |
32874aea |
1476 | if (c == 'S') |
1477 | i = transS[i]; |
1478 | else if (c == 'H') |
1479 | i = transH[i]; |
1480 | else if (c == '-') |
1481 | i = transminus[i]; |
1482 | else |
1483 | i = 0; |
8df7a775 |
1484 | if (i < 0) |
1485 | break; |
1486 | crReturn(1); /* get another character */ |
374330e2 |
1487 | } |
8df7a775 |
1488 | |
50526e47 |
1489 | vstrsize = 16; |
bd358db1 |
1490 | vstring = smalloc(vstrsize); |
c5e9c988 |
1491 | strcpy(vstring, "SSH-"); |
50526e47 |
1492 | vslen = 4; |
374330e2 |
1493 | i = 0; |
1494 | while (1) { |
8df7a775 |
1495 | crReturn(1); /* get another char */ |
32874aea |
1496 | if (vslen >= vstrsize - 1) { |
1497 | vstrsize += 16; |
1498 | vstring = srealloc(vstring, vstrsize); |
1499 | } |
1500 | vstring[vslen++] = c; |
374330e2 |
1501 | if (i >= 0) { |
1502 | if (c == '-') { |
1503 | version[i] = '\0'; |
1504 | i = -1; |
32874aea |
1505 | } else if (i < sizeof(version) - 1) |
374330e2 |
1506 | version[i++] = c; |
32874aea |
1507 | } else if (c == '\n') |
374330e2 |
1508 | break; |
1509 | } |
1510 | |
db7d555c |
1511 | ssh_agentfwd_enabled = FALSE; |
960e736a |
1512 | rdpkt2_state.incoming_sequence = 0; |
1513 | |
50526e47 |
1514 | vstring[vslen] = 0; |
9275ca8a |
1515 | vlog = smalloc(20 + vslen); |
bd358db1 |
1516 | vstring[strcspn (vstring, "\r\n")] = '\0'; /* remove end-of-line chars */ |
c5e9c988 |
1517 | sprintf(vlog, "Server version: %s", vstring); |
c5e9c988 |
1518 | logevent(vlog); |
bd358db1 |
1519 | ssh_detect_bugs(vstring); |
9275ca8a |
1520 | sfree(vlog); |
c5e9c988 |
1521 | |
adf799dd |
1522 | /* |
1523 | * Server version "1.99" means we can choose whether we use v1 |
1524 | * or v2 protocol. Choice is based on cfg.sshprot. |
1525 | */ |
1526 | if (ssh_versioncmp(version, cfg.sshprot == 1 ? "2.0" : "1.99") >= 0) { |
32874aea |
1527 | /* |
1528 | * This is a v2 server. Begin v2 protocol. |
1529 | */ |
1530 | char verstring[80], vlog[100]; |
1531 | sprintf(verstring, "SSH-2.0-%s", sshver); |
1532 | SHA_Init(&exhashbase); |
1533 | /* |
1534 | * Hash our version string and their version string. |
1535 | */ |
1536 | sha_string(&exhashbase, verstring, strlen(verstring)); |
1537 | sha_string(&exhashbase, vstring, strcspn(vstring, "\r\n")); |
1538 | sprintf(vlog, "We claim version: %s", verstring); |
1539 | logevent(vlog); |
1540 | strcat(verstring, "\n"); |
1541 | logevent("Using SSH protocol version 2"); |
1542 | sk_write(s, verstring, strlen(verstring)); |
1543 | ssh_protocol = ssh2_protocol; |
1544 | ssh_version = 2; |
1545 | s_rdpkt = ssh2_rdpkt; |
e5574168 |
1546 | } else { |
32874aea |
1547 | /* |
1548 | * This is a v1 server. Begin v1 protocol. |
1549 | */ |
1550 | char verstring[80], vlog[100]; |
1551 | sprintf(verstring, "SSH-%s-%s", |
1552 | (ssh_versioncmp(version, "1.5") <= 0 ? version : "1.5"), |
1553 | sshver); |
1554 | sprintf(vlog, "We claim version: %s", verstring); |
1555 | logevent(vlog); |
1556 | strcat(verstring, "\n"); |
1557 | logevent("Using SSH protocol version 1"); |
1558 | sk_write(s, verstring, strlen(verstring)); |
1559 | ssh_protocol = ssh1_protocol; |
1560 | ssh_version = 1; |
1561 | s_rdpkt = ssh1_rdpkt; |
e5574168 |
1562 | } |
3687d221 |
1563 | ssh_state = SSH_STATE_BEFORE_SIZE; |
8df7a775 |
1564 | |
50526e47 |
1565 | sfree(vstring); |
50526e47 |
1566 | |
8df7a775 |
1567 | crFinish(0); |
1568 | } |
1569 | |
1570 | static void ssh_gotdata(unsigned char *data, int datalen) |
1571 | { |
1572 | crBegin; |
1573 | |
1574 | /* |
1575 | * To begin with, feed the characters one by one to the |
1576 | * protocol initialisation / selection function do_ssh_init(). |
1577 | * When that returns 0, we're done with the initial greeting |
1578 | * exchange and can move on to packet discipline. |
1579 | */ |
1580 | while (1) { |
1581 | int ret; |
1582 | if (datalen == 0) |
1583 | crReturnV; /* more data please */ |
1584 | ret = do_ssh_init(*data); |
32874aea |
1585 | data++; |
1586 | datalen--; |
8df7a775 |
1587 | if (ret == 0) |
1588 | break; |
1589 | } |
1590 | |
1591 | /* |
1592 | * We emerge from that loop when the initial negotiation is |
1593 | * over and we have selected an s_rdpkt function. Now pass |
1594 | * everything to s_rdpkt, and then pass the resulting packets |
1595 | * to the proper protocol handler. |
1596 | */ |
1597 | if (datalen == 0) |
1598 | crReturnV; |
1599 | while (1) { |
1600 | while (datalen > 0) { |
32874aea |
1601 | if (s_rdpkt(&data, &datalen) == 0) { |
e14d0f19 |
1602 | if (ssh_state == SSH_STATE_CLOSED) { |
1603 | return; |
1604 | } |
8df7a775 |
1605 | ssh_protocol(NULL, 0, 1); |
1606 | if (ssh_state == SSH_STATE_CLOSED) { |
1607 | return; |
1608 | } |
1609 | } |
1610 | } |
1611 | crReturnV; |
1612 | } |
1613 | crFinishV; |
1614 | } |
1615 | |
32874aea |
1616 | static int ssh_closing(Plug plug, char *error_msg, int error_code, |
1617 | int calling_back) |
1618 | { |
7e78000d |
1619 | ssh_state = SSH_STATE_CLOSED; |
f3ab576e |
1620 | if (s) { |
1621 | sk_close(s); |
1622 | s = NULL; |
1623 | } |
7e78000d |
1624 | if (error_msg) { |
32874aea |
1625 | /* A socket error has occurred. */ |
1626 | connection_fatal(error_msg); |
7e78000d |
1627 | } else { |
1628 | /* Otherwise, the remote side closed the connection normally. */ |
8df7a775 |
1629 | } |
7e78000d |
1630 | return 0; |
1631 | } |
1632 | |
32874aea |
1633 | static int ssh_receive(Plug plug, int urgent, char *data, int len) |
1634 | { |
1635 | ssh_gotdata(data, len); |
3257deae |
1636 | if (ssh_state == SSH_STATE_CLOSED) { |
32874aea |
1637 | if (s) { |
1638 | sk_close(s); |
1639 | s = NULL; |
1640 | } |
1641 | return 0; |
3257deae |
1642 | } |
fef97f43 |
1643 | return 1; |
374330e2 |
1644 | } |
1645 | |
5471d09a |
1646 | static void ssh_sent(Plug plug, int bufsize) |
1647 | { |
1648 | /* |
1649 | * If the send backlog on the SSH socket itself clears, we |
1650 | * should unthrottle the whole world if it was throttled. |
1651 | */ |
1652 | if (bufsize < SSH_MAX_BACKLOG) |
1653 | ssh_throttle_all(0, bufsize); |
1654 | } |
1655 | |
fb09bf1c |
1656 | /* |
8df7a775 |
1657 | * Connect to specified host and port. |
1658 | * Returns an error message, or NULL on success. |
6e1ebb76 |
1659 | * Also places the canonical host name into `realhost'. It must be |
1660 | * freed by the caller. |
8df7a775 |
1661 | */ |
1662 | static char *connect_to_host(char *host, int port, char **realhost) |
1663 | { |
7e78000d |
1664 | static struct plug_function_table fn_table = { |
1665 | ssh_closing, |
5471d09a |
1666 | ssh_receive, |
1667 | ssh_sent, |
1668 | NULL |
7e78000d |
1669 | }, *fn_table_ptr = &fn_table; |
1670 | |
8df7a775 |
1671 | SockAddr addr; |
1672 | char *err; |
1673 | #ifdef FWHACK |
1674 | char *FWhost; |
1675 | int FWport; |
1676 | #endif |
1677 | |
32874aea |
1678 | savedhost = smalloc(1 + strlen(host)); |
8df7a775 |
1679 | if (!savedhost) |
1680 | fatalbox("Out of memory"); |
1681 | strcpy(savedhost, host); |
1682 | |
1683 | if (port < 0) |
1684 | port = 22; /* default ssh port */ |
1685 | savedport = port; |
1686 | |
1687 | #ifdef FWHACK |
1688 | FWhost = host; |
1689 | FWport = port; |
1690 | host = FWSTR; |
1691 | port = 23; |
1692 | #endif |
1693 | |
1694 | /* |
1695 | * Try to find host. |
1696 | */ |
3ad9d396 |
1697 | { |
1698 | char buf[200]; |
1699 | sprintf(buf, "Looking up host \"%.170s\"", host); |
1700 | logevent(buf); |
1701 | } |
8df7a775 |
1702 | addr = sk_namelookup(host, realhost); |
32874aea |
1703 | if ((err = sk_addr_error(addr))) |
8df7a775 |
1704 | return err; |
1705 | |
1706 | #ifdef FWHACK |
6e1ebb76 |
1707 | *realhost = strdup(FWhost); |
8df7a775 |
1708 | #endif |
1709 | |
1710 | /* |
1711 | * Open socket. |
1712 | */ |
3ad9d396 |
1713 | { |
1714 | char buf[200], addrbuf[100]; |
1715 | sk_getaddr(addr, addrbuf, 100); |
1716 | sprintf(buf, "Connecting to %.100s port %d", addrbuf, port); |
1717 | logevent(buf); |
1718 | } |
7e78000d |
1719 | s = sk_new(addr, port, 0, 1, &fn_table_ptr); |
32874aea |
1720 | if ((err = sk_socket_error(s))) |
8df7a775 |
1721 | return err; |
1722 | |
1723 | #ifdef FWHACK |
1724 | sk_write(s, "connect ", 8); |
1725 | sk_write(s, FWhost, strlen(FWhost)); |
1726 | { |
1727 | char buf[20]; |
1728 | sprintf(buf, " %d\n", FWport); |
1729 | sk_write(s, buf, strlen(buf)); |
1730 | } |
1731 | #endif |
1732 | |
1733 | return NULL; |
1734 | } |
1735 | |
1736 | /* |
5471d09a |
1737 | * Throttle or unthrottle the SSH connection. |
1738 | */ |
1739 | static void ssh1_throttle(int adjust) |
1740 | { |
1741 | int old_count = ssh1_throttle_count; |
1742 | ssh1_throttle_count += adjust; |
1743 | assert(ssh1_throttle_count >= 0); |
1744 | if (ssh1_throttle_count && !old_count) { |
1745 | sk_set_frozen(s, 1); |
1746 | } else if (!ssh1_throttle_count && old_count) { |
1747 | sk_set_frozen(s, 0); |
1748 | } |
1749 | } |
1750 | |
1751 | /* |
1752 | * Throttle or unthrottle _all_ local data streams (for when sends |
1753 | * on the SSH connection itself back up). |
1754 | */ |
1755 | static void ssh_throttle_all(int enable, int bufsize) |
1756 | { |
1757 | int i; |
1758 | struct ssh_channel *c; |
1759 | |
1760 | if (enable == ssh_throttled_all) |
1761 | return; |
1762 | ssh_throttled_all = enable; |
1763 | ssh_overall_bufsize = bufsize; |
1764 | if (!ssh_channels) |
1765 | return; |
1766 | for (i = 0; NULL != (c = index234(ssh_channels, i)); i++) { |
1767 | switch (c->type) { |
1768 | case CHAN_MAINSESSION: |
1769 | /* |
1770 | * This is treated separately, outside the switch. |
1771 | */ |
1772 | break; |
1773 | case CHAN_X11: |
1774 | x11_override_throttle(c->u.x11.s, enable); |
1775 | break; |
1776 | case CHAN_AGENT: |
1777 | /* Agent channels require no buffer management. */ |
1778 | break; |
1779 | case CHAN_SOCKDATA: |
1780 | pfd_override_throttle(c->u.x11.s, enable); |
1781 | break; |
1782 | } |
1783 | } |
1784 | } |
1785 | |
1786 | /* |
fb09bf1c |
1787 | * Handle the key exchange and user authentication phases. |
1788 | */ |
e5574168 |
1789 | static int do_ssh1_login(unsigned char *in, int inlen, int ispkt) |
fb09bf1c |
1790 | { |
2d466ffd |
1791 | int i, j; |
1792 | static int len; |
1793 | static unsigned char *rsabuf, *keystr1, *keystr2; |
374330e2 |
1794 | unsigned char cookie[8]; |
1795 | struct RSAKey servkey, hostkey; |
1796 | struct MD5Context md5c; |
ccbfb941 |
1797 | static unsigned long supported_ciphers_mask, supported_auths_mask; |
7cca0d81 |
1798 | static int tried_publickey; |
614a20a0 |
1799 | static int tis_auth_refused, ccard_auth_refused; |
7cca0d81 |
1800 | static unsigned char session_id[16]; |
2d466ffd |
1801 | static int cipher_type; |
b585ec46 |
1802 | static char username[100]; |
374330e2 |
1803 | |
374330e2 |
1804 | crBegin; |
1805 | |
32874aea |
1806 | if (!ispkt) |
1807 | crWaitUntil(ispkt); |
374330e2 |
1808 | |
8d5de777 |
1809 | if (pktin.type != SSH1_SMSG_PUBLIC_KEY) { |
1810 | bombout(("Public key packet not received")); |
32874aea |
1811 | crReturn(0); |
8d5de777 |
1812 | } |
374330e2 |
1813 | |
c5e9c988 |
1814 | logevent("Received public keys"); |
374330e2 |
1815 | |
c5e9c988 |
1816 | memcpy(cookie, pktin.body, 8); |
374330e2 |
1817 | |
32874aea |
1818 | i = makekey(pktin.body + 8, &servkey, &keystr1, 0); |
1819 | j = makekey(pktin.body + 8 + i, &hostkey, &keystr2, 0); |
374330e2 |
1820 | |
c5e9c988 |
1821 | /* |
1c2a93c4 |
1822 | * Log the host key fingerprint. |
c5e9c988 |
1823 | */ |
c5e9c988 |
1824 | { |
1825 | char logmsg[80]; |
1c2a93c4 |
1826 | logevent("Host key fingerprint is:"); |
c5e9c988 |
1827 | strcpy(logmsg, " "); |
32874aea |
1828 | hostkey.comment = NULL; |
1829 | rsa_fingerprint(logmsg + strlen(logmsg), |
1830 | sizeof(logmsg) - strlen(logmsg), &hostkey); |
c5e9c988 |
1831 | logevent(logmsg); |
1832 | } |
1833 | |
32874aea |
1834 | ssh1_remote_protoflags = GET_32BIT(pktin.body + 8 + i + j); |
1835 | supported_ciphers_mask = GET_32BIT(pktin.body + 12 + i + j); |
1836 | supported_auths_mask = GET_32BIT(pktin.body + 16 + i + j); |
bea1ef5f |
1837 | |
32874aea |
1838 | ssh1_local_protoflags = |
1839 | ssh1_remote_protoflags & SSH1_PROTOFLAGS_SUPPORTED; |
b96dc54c |
1840 | ssh1_local_protoflags |= SSH1_PROTOFLAG_SCREEN_NUMBER; |
1841 | |
c5e9c988 |
1842 | MD5Init(&md5c); |
374330e2 |
1843 | MD5Update(&md5c, keystr2, hostkey.bytes); |
1844 | MD5Update(&md5c, keystr1, servkey.bytes); |
1845 | MD5Update(&md5c, pktin.body, 8); |
374330e2 |
1846 | MD5Final(session_id, &md5c); |
1847 | |
32874aea |
1848 | for (i = 0; i < 32; i++) |
374330e2 |
1849 | session_key[i] = random_byte(); |
1850 | |
1851 | len = (hostkey.bytes > servkey.bytes ? hostkey.bytes : servkey.bytes); |
1852 | |
dcbde236 |
1853 | rsabuf = smalloc(len); |
374330e2 |
1854 | if (!rsabuf) |
1855 | fatalbox("Out of memory"); |
1856 | |
89ee5268 |
1857 | /* |
1858 | * Verify the host key. |
1859 | */ |
1860 | { |
32874aea |
1861 | /* |
1862 | * First format the key into a string. |
1863 | */ |
1864 | int len = rsastr_len(&hostkey); |
1865 | char fingerprint[100]; |
1866 | char *keystr = smalloc(len); |
1867 | if (!keystr) |
1868 | fatalbox("Out of memory"); |
1869 | rsastr_fmt(keystr, &hostkey); |
1870 | rsa_fingerprint(fingerprint, sizeof(fingerprint), &hostkey); |
1871 | verify_ssh_host_key(savedhost, savedport, "rsa", keystr, |
1872 | fingerprint); |
1873 | sfree(keystr); |
1874 | } |
1875 | |
1876 | for (i = 0; i < 32; i++) { |
374330e2 |
1877 | rsabuf[i] = session_key[i]; |
1878 | if (i < 16) |
1879 | rsabuf[i] ^= session_id[i]; |
1880 | } |
1881 | |
1882 | if (hostkey.bytes > servkey.bytes) { |
1883 | rsaencrypt(rsabuf, 32, &servkey); |
1884 | rsaencrypt(rsabuf, servkey.bytes, &hostkey); |
1885 | } else { |
1886 | rsaencrypt(rsabuf, 32, &hostkey); |
1887 | rsaencrypt(rsabuf, hostkey.bytes, &servkey); |
1888 | } |
1889 | |
c5e9c988 |
1890 | logevent("Encrypted session key"); |
1891 | |
ca20bfcf |
1892 | { |
1893 | int cipher_chosen = 0, warn = 0; |
1894 | char *cipher_string = NULL; |
1895 | for (i = 0; !cipher_chosen && i < CIPHER_MAX; i++) { |
1896 | int next_cipher = cfg.ssh_cipherlist[i]; |
1897 | if (next_cipher == CIPHER_WARN) { |
1898 | /* If/when we choose a cipher, warn about it */ |
1899 | warn = 1; |
1900 | } else if (next_cipher == CIPHER_AES) { |
1901 | /* XXX Probably don't need to mention this. */ |
1902 | logevent("AES not supported in SSH1, skipping"); |
1903 | } else { |
1904 | switch (next_cipher) { |
1905 | case CIPHER_3DES: cipher_type = SSH_CIPHER_3DES; |
1906 | cipher_string = "3DES"; break; |
1907 | case CIPHER_BLOWFISH: cipher_type = SSH_CIPHER_BLOWFISH; |
1908 | cipher_string = "Blowfish"; break; |
1909 | case CIPHER_DES: cipher_type = SSH_CIPHER_DES; |
1910 | cipher_string = "single-DES"; break; |
1911 | } |
1912 | if (supported_ciphers_mask & (1 << cipher_type)) |
1913 | cipher_chosen = 1; |
1914 | } |
1915 | } |
1916 | if (!cipher_chosen) { |
1917 | if ((supported_ciphers_mask & (1 << SSH_CIPHER_3DES)) == 0) |
1918 | bombout(("Server violates SSH 1 protocol by not " |
1919 | "supporting 3DES encryption")); |
1920 | else |
1921 | /* shouldn't happen */ |
1922 | bombout(("No supported ciphers found")); |
a99a05c0 |
1923 | crReturn(0); |
1924 | } |
ca20bfcf |
1925 | |
1926 | /* Warn about chosen cipher if necessary. */ |
1927 | if (warn) |
1928 | askcipher(cipher_string, 0); |
bea1ef5f |
1929 | } |
ca20bfcf |
1930 | |
c5e9c988 |
1931 | switch (cipher_type) { |
32874aea |
1932 | case SSH_CIPHER_3DES: |
1933 | logevent("Using 3DES encryption"); |
1934 | break; |
1935 | case SSH_CIPHER_DES: |
1936 | logevent("Using single-DES encryption"); |
1937 | break; |
1938 | case SSH_CIPHER_BLOWFISH: |
1939 | logevent("Using Blowfish encryption"); |
1940 | break; |
c5e9c988 |
1941 | } |
bea1ef5f |
1942 | |
e5574168 |
1943 | send_packet(SSH1_CMSG_SESSION_KEY, |
32874aea |
1944 | PKT_CHAR, cipher_type, |
1945 | PKT_DATA, cookie, 8, |
1946 | PKT_CHAR, (len * 8) >> 8, PKT_CHAR, (len * 8) & 0xFF, |
1947 | PKT_DATA, rsabuf, len, |
1948 | PKT_INT, ssh1_local_protoflags, PKT_END); |
fb09bf1c |
1949 | |
c5e9c988 |
1950 | logevent("Trying to enable encryption..."); |
374330e2 |
1951 | |
dcbde236 |
1952 | sfree(rsabuf); |
374330e2 |
1953 | |
5e8358ad |
1954 | cipher = cipher_type == SSH_CIPHER_BLOWFISH ? &ssh_blowfish_ssh1 : |
32874aea |
1955 | cipher_type == SSH_CIPHER_DES ? &ssh_des : &ssh_3des; |
374330e2 |
1956 | cipher->sesskey(session_key); |
1957 | |
fb09bf1c |
1958 | crWaitUntil(ispkt); |
374330e2 |
1959 | |
8d5de777 |
1960 | if (pktin.type != SSH1_SMSG_SUCCESS) { |
1961 | bombout(("Encryption not successfully enabled")); |
32874aea |
1962 | crReturn(0); |
8d5de777 |
1963 | } |
374330e2 |
1964 | |
c5e9c988 |
1965 | logevent("Successfully started encryption"); |
1966 | |
374330e2 |
1967 | fflush(stdout); |
1968 | { |
374330e2 |
1969 | static int pos = 0; |
1970 | static char c; |
67779be7 |
1971 | if ((flags & FLAG_INTERACTIVE) && !*cfg.username) { |
32874aea |
1972 | if (ssh_get_line) { |
1973 | if (!ssh_get_line("login as: ", |
1974 | username, sizeof(username), FALSE)) { |
1975 | /* |
1976 | * get_line failed to get a username. |
1977 | * Terminate. |
1978 | */ |
1979 | logevent("No username provided. Abandoning session."); |
1980 | ssh_state = SSH_STATE_CLOSED; |
1981 | crReturn(1); |
1982 | } |
1983 | } else { |
1984 | c_write_str("login as: "); |
1985 | ssh_send_ok = 1; |
1986 | while (pos >= 0) { |
1987 | crWaitUntil(!ispkt); |
1988 | while (inlen--) |
1989 | switch (c = *in++) { |
1990 | case 10: |
1991 | case 13: |
1992 | username[pos] = 0; |
1993 | pos = -1; |
1994 | break; |
1995 | case 8: |
1996 | case 127: |
1997 | if (pos > 0) { |
1998 | c_write_str("\b \b"); |
1999 | pos--; |
2000 | } |
2001 | break; |
2002 | case 21: |
2003 | case 27: |
2004 | while (pos > 0) { |
2005 | c_write_str("\b \b"); |
2006 | pos--; |
2007 | } |
2008 | break; |
2009 | case 3: |
2010 | case 4: |
2011 | random_save_seed(); |
2012 | exit(0); |
2013 | break; |
2014 | default: |
2015 | if (((c >= ' ' && c <= '~') || |
51b2fb65 |
2016 | ((unsigned char) c >= 160)) |
2017 | && pos < sizeof(username)-1) { |
32874aea |
2018 | username[pos++] = c; |
2019 | c_write(&c, 1); |
2020 | } |
2021 | break; |
2022 | } |
2023 | } |
2024 | c_write_str("\r\n"); |
2025 | username[strcspn(username, "\n\r")] = '\0'; |
2026 | } |
2027 | } else { |
374330e2 |
2028 | strncpy(username, cfg.username, 99); |
2029 | username[99] = '\0'; |
374330e2 |
2030 | } |
fb09bf1c |
2031 | |
e5574168 |
2032 | send_packet(SSH1_CMSG_USER, PKT_STR, username, PKT_END); |
c5e9c988 |
2033 | { |
32874aea |
2034 | char userlog[22 + sizeof(username)]; |
c5e9c988 |
2035 | sprintf(userlog, "Sent username \"%s\"", username); |
2036 | logevent(userlog); |
32874aea |
2037 | if (flags & FLAG_INTERACTIVE && |
2038 | (!((flags & FLAG_STDERR) && (flags & FLAG_VERBOSE)))) { |
3c8e959b |
2039 | strcat(userlog, "\r\n"); |
32874aea |
2040 | c_write_str(userlog); |
3c8e959b |
2041 | } |
c5e9c988 |
2042 | } |
374330e2 |
2043 | } |
2044 | |
fb09bf1c |
2045 | crWaitUntil(ispkt); |
374330e2 |
2046 | |
7cca0d81 |
2047 | tried_publickey = 0; |
614a20a0 |
2048 | tis_auth_refused = ccard_auth_refused = 0; |
7cca0d81 |
2049 | |
e5574168 |
2050 | while (pktin.type == SSH1_SMSG_FAILURE) { |
374330e2 |
2051 | static char password[100]; |
a52f067e |
2052 | static char prompt[200]; |
374330e2 |
2053 | static int pos; |
2054 | static char c; |
32874aea |
2055 | static int pwpkt_type; |
32874aea |
2056 | pwpkt_type = SSH1_CMSG_AUTH_PASSWORD; |
614a20a0 |
2057 | |
32874aea |
2058 | if (agent_exists()) { |
2059 | /* |
2060 | * Attempt RSA authentication using Pageant. |
2061 | */ |
2062 | static unsigned char request[5], *response, *p; |
2063 | static int responselen; |
2064 | static int i, nkeys; |
2065 | static int authed = FALSE; |
2066 | void *r; |
2067 | |
2068 | logevent("Pageant is running. Requesting keys."); |
2069 | |
2070 | /* Request the keys held by the agent. */ |
2071 | PUT_32BIT(request, 1); |
2072 | request[4] = SSH1_AGENTC_REQUEST_RSA_IDENTITIES; |
2073 | agent_query(request, 5, &r, &responselen); |
2074 | response = (unsigned char *) r; |
2075 | if (response && responselen >= 5 && |
2076 | response[4] == SSH1_AGENT_RSA_IDENTITIES_ANSWER) { |
2077 | p = response + 5; |
2078 | nkeys = GET_32BIT(p); |
2079 | p += 4; |
2080 | { |
2081 | char buf[64]; |
2082 | sprintf(buf, "Pageant has %d SSH1 keys", nkeys); |
2083 | logevent(buf); |
2084 | } |
2085 | for (i = 0; i < nkeys; i++) { |
2086 | static struct RSAKey key; |
2087 | static Bignum challenge; |
2088 | static char *commentp; |
2089 | static int commentlen; |
2090 | |
2091 | { |
2092 | char buf[64]; |
2093 | sprintf(buf, "Trying Pageant key #%d", i); |
2094 | logevent(buf); |
2095 | } |
2096 | p += 4; |
2097 | p += ssh1_read_bignum(p, &key.exponent); |
2098 | p += ssh1_read_bignum(p, &key.modulus); |
2099 | commentlen = GET_32BIT(p); |
2100 | p += 4; |
2101 | commentp = p; |
2102 | p += commentlen; |
2103 | send_packet(SSH1_CMSG_AUTH_RSA, |
2104 | PKT_BIGNUM, key.modulus, PKT_END); |
2105 | crWaitUntil(ispkt); |
2106 | if (pktin.type != SSH1_SMSG_AUTH_RSA_CHALLENGE) { |
2107 | logevent("Key refused"); |
2108 | continue; |
2109 | } |
2110 | logevent("Received RSA challenge"); |
2111 | ssh1_read_bignum(pktin.body, &challenge); |
2112 | { |
2113 | char *agentreq, *q, *ret; |
2d466ffd |
2114 | void *vret; |
32874aea |
2115 | int len, retlen; |
2116 | len = 1 + 4; /* message type, bit count */ |
2117 | len += ssh1_bignum_length(key.exponent); |
2118 | len += ssh1_bignum_length(key.modulus); |
2119 | len += ssh1_bignum_length(challenge); |
2120 | len += 16; /* session id */ |
2121 | len += 4; /* response format */ |
2122 | agentreq = smalloc(4 + len); |
2123 | PUT_32BIT(agentreq, len); |
2124 | q = agentreq + 4; |
2125 | *q++ = SSH1_AGENTC_RSA_CHALLENGE; |
2126 | PUT_32BIT(q, bignum_bitcount(key.modulus)); |
2127 | q += 4; |
2128 | q += ssh1_write_bignum(q, key.exponent); |
2129 | q += ssh1_write_bignum(q, key.modulus); |
2130 | q += ssh1_write_bignum(q, challenge); |
2131 | memcpy(q, session_id, 16); |
2132 | q += 16; |
2133 | PUT_32BIT(q, 1); /* response format */ |
2d466ffd |
2134 | agent_query(agentreq, len + 4, &vret, &retlen); |
2135 | ret = vret; |
32874aea |
2136 | sfree(agentreq); |
2137 | if (ret) { |
2138 | if (ret[4] == SSH1_AGENT_RSA_RESPONSE) { |
2139 | logevent("Sending Pageant's response"); |
2140 | send_packet(SSH1_CMSG_AUTH_RSA_RESPONSE, |
2141 | PKT_DATA, ret + 5, 16, |
2142 | PKT_END); |
2143 | sfree(ret); |
2144 | crWaitUntil(ispkt); |
2145 | if (pktin.type == SSH1_SMSG_SUCCESS) { |
2146 | logevent |
2147 | ("Pageant's response accepted"); |
2148 | if (flags & FLAG_VERBOSE) { |
2149 | c_write_str |
2150 | ("Authenticated using RSA key \""); |
2151 | c_write(commentp, commentlen); |
2152 | c_write_str("\" from agent\r\n"); |
2153 | } |
2154 | authed = TRUE; |
2155 | } else |
2156 | logevent |
2157 | ("Pageant's response not accepted"); |
2158 | } else { |
2159 | logevent |
2160 | ("Pageant failed to answer challenge"); |
2161 | sfree(ret); |
2162 | } |
2163 | } else { |
2164 | logevent("No reply received from Pageant"); |
2165 | } |
2166 | } |
2167 | freebn(key.exponent); |
2168 | freebn(key.modulus); |
2169 | freebn(challenge); |
2170 | if (authed) |
2171 | break; |
2172 | } |
2173 | } |
2174 | if (authed) |
2175 | break; |
2176 | } |
2177 | if (*cfg.keyfile && !tried_publickey) |
2178 | pwpkt_type = SSH1_CMSG_AUTH_RSA; |
2179 | |
614a20a0 |
2180 | if (cfg.try_tis_auth && |
2181 | (supported_auths_mask & (1 << SSH1_AUTH_TIS)) && |
2182 | !tis_auth_refused) { |
32874aea |
2183 | pwpkt_type = SSH1_CMSG_AUTH_TIS_RESPONSE; |
2184 | logevent("Requested TIS authentication"); |
2185 | send_packet(SSH1_CMSG_AUTH_TIS, PKT_END); |
2186 | crWaitUntil(ispkt); |
2187 | if (pktin.type != SSH1_SMSG_AUTH_TIS_CHALLENGE) { |
2188 | logevent("TIS authentication declined"); |
2189 | if (flags & FLAG_INTERACTIVE) |
2190 | c_write_str("TIS authentication refused.\r\n"); |
614a20a0 |
2191 | tis_auth_refused = 1; |
2192 | continue; |
32874aea |
2193 | } else { |
2194 | int challengelen = ((pktin.body[0] << 24) | |
2195 | (pktin.body[1] << 16) | |
2196 | (pktin.body[2] << 8) | |
2197 | (pktin.body[3])); |
2198 | logevent("Received TIS challenge"); |
2199 | if (challengelen > sizeof(prompt) - 1) |
2200 | challengelen = sizeof(prompt) - 1; /* prevent overrun */ |
2201 | memcpy(prompt, pktin.body + 4, challengelen); |
614a20a0 |
2202 | /* Prompt heuristic comes from OpenSSH */ |
2203 | strncpy(prompt + challengelen, |
2204 | memchr(prompt, '\n', challengelen) ? |
2205 | "": "\r\nResponse: ", |
2206 | (sizeof prompt) - challengelen); |
2207 | prompt[(sizeof prompt) - 1] = '\0'; |
32874aea |
2208 | } |
2209 | } |
614a20a0 |
2210 | if (cfg.try_tis_auth && |
2211 | (supported_auths_mask & (1 << SSH1_AUTH_CCARD)) && |
2212 | !ccard_auth_refused) { |
32874aea |
2213 | pwpkt_type = SSH1_CMSG_AUTH_CCARD_RESPONSE; |
2214 | logevent("Requested CryptoCard authentication"); |
2215 | send_packet(SSH1_CMSG_AUTH_CCARD, PKT_END); |
2216 | crWaitUntil(ispkt); |
2217 | if (pktin.type != SSH1_SMSG_AUTH_CCARD_CHALLENGE) { |
2218 | logevent("CryptoCard authentication declined"); |
2219 | c_write_str("CryptoCard authentication refused.\r\n"); |
614a20a0 |
2220 | ccard_auth_refused = 1; |
2221 | continue; |
32874aea |
2222 | } else { |
2223 | int challengelen = ((pktin.body[0] << 24) | |
2224 | (pktin.body[1] << 16) | |
2225 | (pktin.body[2] << 8) | |
2226 | (pktin.body[3])); |
2227 | logevent("Received CryptoCard challenge"); |
2228 | if (challengelen > sizeof(prompt) - 1) |
2229 | challengelen = sizeof(prompt) - 1; /* prevent overrun */ |
2230 | memcpy(prompt, pktin.body + 4, challengelen); |
614a20a0 |
2231 | strncpy(prompt + challengelen, |
2232 | memchr(prompt, '\n', challengelen) ? |
2233 | "" : "\r\nResponse: ", |
32874aea |
2234 | sizeof(prompt) - challengelen); |
2235 | prompt[sizeof(prompt) - 1] = '\0'; |
2236 | } |
2237 | } |
2238 | if (pwpkt_type == SSH1_CMSG_AUTH_PASSWORD) { |
2239 | sprintf(prompt, "%.90s@%.90s's password: ", |
2240 | username, savedhost); |
2241 | } |
2242 | if (pwpkt_type == SSH1_CMSG_AUTH_RSA) { |
2243 | char *comment = NULL; |
2244 | if (flags & FLAG_VERBOSE) |
2245 | c_write_str("Trying public key authentication.\r\n"); |
2246 | if (!rsakey_encrypted(cfg.keyfile, &comment)) { |
2247 | if (flags & FLAG_VERBOSE) |
2248 | c_write_str("No passphrase required.\r\n"); |
2249 | goto tryauth; |
2250 | } |
2251 | sprintf(prompt, "Passphrase for key \"%.100s\": ", comment); |
2252 | sfree(comment); |
2253 | } |
a52f067e |
2254 | |
614a20a0 |
2255 | /* |
2256 | * Show password prompt, having first obtained it via a TIS |
2257 | * or CryptoCard exchange if we're doing TIS or CryptoCard |
2258 | * authentication. |
2259 | */ |
fa17a66e |
2260 | if (ssh_get_line) { |
2261 | if (!ssh_get_line(prompt, password, sizeof(password), TRUE)) { |
32874aea |
2262 | /* |
2263 | * get_line failed to get a password (for example |
2264 | * because one was supplied on the command line |
2265 | * which has already failed to work). Terminate. |
2266 | */ |
2bc6a386 |
2267 | send_packet(SSH1_MSG_DISCONNECT, |
2268 | PKT_STR, "No more passwords available to try", |
2269 | PKT_END); |
2270 | connection_fatal("Unable to authenticate"); |
32874aea |
2271 | ssh_state = SSH_STATE_CLOSED; |
2272 | crReturn(1); |
2273 | } |
fb09bf1c |
2274 | } else { |
614a20a0 |
2275 | /* Prompt may have come from server. We've munged it a bit, so |
2276 | * we know it to be zero-terminated at least once. */ |
2277 | c_write_untrusted(prompt, strlen(prompt)); |
32874aea |
2278 | pos = 0; |
2279 | ssh_send_ok = 1; |
2280 | while (pos >= 0) { |
2281 | crWaitUntil(!ispkt); |
2282 | while (inlen--) |
2283 | switch (c = *in++) { |
2284 | case 10: |
2285 | case 13: |
2286 | password[pos] = 0; |
2287 | pos = -1; |
2288 | break; |
2289 | case 8: |
2290 | case 127: |
2291 | if (pos > 0) |
2292 | pos--; |
2293 | break; |
2294 | case 21: |
2295 | case 27: |
2296 | pos = 0; |
2297 | break; |
2298 | case 3: |
2299 | case 4: |
2300 | random_save_seed(); |
2301 | exit(0); |
2302 | break; |
2303 | default: |
51b2fb65 |
2304 | if (pos < sizeof(password)-1) |
32874aea |
2305 | password[pos++] = c; |
2306 | break; |
2307 | } |
2308 | } |
2309 | c_write_str("\r\n"); |
2310 | } |
2311 | |
2312 | tryauth: |
7cca0d81 |
2313 | if (pwpkt_type == SSH1_CMSG_AUTH_RSA) { |
32874aea |
2314 | /* |
2315 | * Try public key authentication with the specified |
2316 | * key file. |
2317 | */ |
2318 | static struct RSAKey pubkey; |
2319 | static Bignum challenge, response; |
2320 | static int i; |
2321 | static unsigned char buffer[32]; |
2322 | |
2323 | tried_publickey = 1; |
2324 | i = loadrsakey(cfg.keyfile, &pubkey, password); |
2325 | if (i == 0) { |
7963af2f |
2326 | c_write_str("Couldn't load private key from "); |
32874aea |
2327 | c_write_str(cfg.keyfile); |
2328 | c_write_str(".\r\n"); |
2329 | continue; /* go and try password */ |
2330 | } |
2331 | if (i == -1) { |
2332 | c_write_str("Wrong passphrase.\r\n"); |
2333 | tried_publickey = 0; |
2334 | continue; /* try again */ |
2335 | } |
2336 | |
2337 | /* |
2338 | * Send a public key attempt. |
2339 | */ |
2340 | send_packet(SSH1_CMSG_AUTH_RSA, |
2341 | PKT_BIGNUM, pubkey.modulus, PKT_END); |
2342 | |
2343 | crWaitUntil(ispkt); |
2344 | if (pktin.type == SSH1_SMSG_FAILURE) { |
2345 | c_write_str("Server refused our public key.\r\n"); |
2346 | continue; /* go and try password */ |
2347 | } |
2348 | if (pktin.type != SSH1_SMSG_AUTH_RSA_CHALLENGE) { |
2349 | bombout(("Bizarre response to offer of public key")); |
2350 | crReturn(0); |
2351 | } |
2352 | ssh1_read_bignum(pktin.body, &challenge); |
2353 | response = rsadecrypt(challenge, &pubkey); |
2354 | freebn(pubkey.private_exponent); /* burn the evidence */ |
2355 | |
2356 | for (i = 0; i < 32; i++) { |
2357 | buffer[i] = bignum_byte(response, 31 - i); |
2358 | } |
2359 | |
2360 | MD5Init(&md5c); |
2361 | MD5Update(&md5c, buffer, 32); |
2362 | MD5Update(&md5c, session_id, 16); |
2363 | MD5Final(buffer, &md5c); |
2364 | |
2365 | send_packet(SSH1_CMSG_AUTH_RSA_RESPONSE, |
2366 | PKT_DATA, buffer, 16, PKT_END); |
2367 | |
2368 | crWaitUntil(ispkt); |
2369 | if (pktin.type == SSH1_SMSG_FAILURE) { |
2370 | if (flags & FLAG_VERBOSE) |
2371 | c_write_str |
2372 | ("Failed to authenticate with our public key.\r\n"); |
2373 | continue; /* go and try password */ |
2374 | } else if (pktin.type != SSH1_SMSG_SUCCESS) { |
2375 | bombout( |
2376 | ("Bizarre response to RSA authentication response")); |
2377 | crReturn(0); |
2378 | } |
2379 | |
2380 | break; /* we're through! */ |
2381 | } else { |
2382 | if (pwpkt_type == SSH1_CMSG_AUTH_PASSWORD) { |
2383 | /* |
2384 | * Defence against traffic analysis: we send a |
2385 | * whole bunch of packets containing strings of |
2386 | * different lengths. One of these strings is the |
2387 | * password, in a SSH1_CMSG_AUTH_PASSWORD packet. |
2388 | * The others are all random data in |
2389 | * SSH1_MSG_IGNORE packets. This way a passive |
2390 | * listener can't tell which is the password, and |
2391 | * hence can't deduce the password length. |
2392 | * |
2393 | * Anybody with a password length greater than 16 |
2394 | * bytes is going to have enough entropy in their |
2395 | * password that a listener won't find it _that_ |
2396 | * much help to know how long it is. So what we'll |
2397 | * do is: |
2398 | * |
2399 | * - if password length < 16, we send 15 packets |
2400 | * containing string lengths 1 through 15 |
2401 | * |
2402 | * - otherwise, we let N be the nearest multiple |
2403 | * of 8 below the password length, and send 8 |
2404 | * packets containing string lengths N through |
2405 | * N+7. This won't obscure the order of |
2406 | * magnitude of the password length, but it will |
2407 | * introduce a bit of extra uncertainty. |
2408 | * |
2409 | * A few servers (the old 1.2.18 through 1.2.22) |
2410 | * can't deal with SSH1_MSG_IGNORE. For these |
2411 | * servers, we need an alternative defence. We make |
2412 | * use of the fact that the password is interpreted |
2413 | * as a C string: so we can append a NUL, then some |
2414 | * random data. |
bd358db1 |
2415 | * |
2416 | * One server (a Cisco one) can deal with neither |
2417 | * SSH1_MSG_IGNORE _nor_ a padded password string. |
2418 | * For this server we are left with no defences |
2419 | * against password length sniffing. |
32874aea |
2420 | */ |
bd358db1 |
2421 | if (!(ssh_remote_bugs & BUG_CHOKES_ON_SSH1_IGNORE)) { |
b17c8428 |
2422 | /* |
2423 | * The server can deal with SSH1_MSG_IGNORE, so |
2424 | * we can use the primary defence. |
2425 | */ |
32874aea |
2426 | int bottom, top, pwlen, i; |
2427 | char *randomstr; |
2428 | |
2429 | pwlen = strlen(password); |
2430 | if (pwlen < 16) { |
2431 | bottom = 0; /* zero length passwords are OK! :-) */ |
2432 | top = 15; |
2433 | } else { |
2434 | bottom = pwlen & ~7; |
2435 | top = bottom + 7; |
2436 | } |
2437 | |
2438 | assert(pwlen >= bottom && pwlen <= top); |
2439 | |
2440 | randomstr = smalloc(top + 1); |
2441 | |
2442 | for (i = bottom; i <= top; i++) { |
2443 | if (i == pwlen) |
2444 | defer_packet(pwpkt_type, PKT_STR, password, |
2445 | PKT_END); |
2446 | else { |
2447 | for (j = 0; j < i; j++) { |
2448 | do { |
2449 | randomstr[j] = random_byte(); |
2450 | } while (randomstr[j] == '\0'); |
2451 | } |
2452 | randomstr[i] = '\0'; |
2453 | defer_packet(SSH1_MSG_IGNORE, |
2454 | PKT_STR, randomstr, PKT_END); |
2455 | } |
2456 | } |
bd358db1 |
2457 | logevent("Sending password with camouflage packets"); |
32874aea |
2458 | ssh_pkt_defersend(); |
bd358db1 |
2459 | } |
2460 | else if (!(ssh_remote_bugs & BUG_NEEDS_SSH1_PLAIN_PASSWORD)) { |
b17c8428 |
2461 | /* |
2462 | * The server can't deal with SSH1_MSG_IGNORE |
2463 | * but can deal with padded passwords, so we |
2464 | * can use the secondary defence. |
2465 | */ |
bd358db1 |
2466 | char string[64]; |
2467 | char *s; |
2468 | int len; |
2469 | |
2470 | len = strlen(password); |
2471 | if (len < sizeof(string)) { |
2472 | s = string; |
2473 | strcpy(string, password); |
2474 | len++; /* cover the zero byte */ |
2475 | while (len < sizeof(string)) { |
2476 | string[len++] = (char) random_byte(); |
2477 | } |
2478 | } else { |
2479 | s = password; |
2480 | } |
2481 | logevent("Sending length-padded password"); |
2482 | send_packet(pwpkt_type, PKT_INT, len, |
2483 | PKT_DATA, s, len, PKT_END); |
2484 | } else { |
2485 | /* |
2486 | * The server has _both_ |
2487 | * BUG_CHOKES_ON_SSH1_IGNORE and |
2488 | * BUG_NEEDS_SSH1_PLAIN_PASSWORD. There is |
2489 | * therefore nothing we can do. |
2490 | */ |
2491 | int len; |
2492 | len = strlen(password); |
2493 | logevent("Sending unpadded password"); |
2494 | send_packet(pwpkt_type, PKT_INT, len, |
2495 | PKT_DATA, password, len, PKT_END); |
32874aea |
2496 | } |
2497 | } else { |
2498 | send_packet(pwpkt_type, PKT_STR, password, PKT_END); |
2499 | } |
2500 | } |
c5e9c988 |
2501 | logevent("Sent password"); |
374330e2 |
2502 | memset(password, 0, strlen(password)); |
fb09bf1c |
2503 | crWaitUntil(ispkt); |
e5574168 |
2504 | if (pktin.type == SSH1_SMSG_FAILURE) { |
32874aea |
2505 | if (flags & FLAG_VERBOSE) |
2506 | c_write_str("Access denied\r\n"); |
c5e9c988 |
2507 | logevent("Authentication refused"); |
e5574168 |
2508 | } else if (pktin.type == SSH1_MSG_DISCONNECT) { |
fb09bf1c |
2509 | logevent("Received disconnect request"); |
32874aea |
2510 | ssh_state = SSH_STATE_CLOSED; |
85ee8208 |
2511 | crReturn(1); |
e5574168 |
2512 | } else if (pktin.type != SSH1_SMSG_SUCCESS) { |
8d5de777 |
2513 | bombout(("Strange packet received, type %d", pktin.type)); |
32874aea |
2514 | crReturn(0); |
374330e2 |
2515 | } |
2516 | } |
2517 | |
c5e9c988 |
2518 | logevent("Authentication successful"); |
2519 | |
fb09bf1c |
2520 | crFinish(1); |
2521 | } |
2522 | |
32874aea |
2523 | void sshfwd_close(struct ssh_channel *c) |
2524 | { |
80e48603 |
2525 | if (c && !c->closes) { |
4ed34d25 |
2526 | /* |
2527 | * If the channel's remoteid is -1, we have sent |
2528 | * CHANNEL_OPEN for this channel, but it hasn't even been |
2529 | * acknowledged by the server. So we must set a close flag |
2530 | * on it now, and then when the server acks the channel |
2531 | * open, we can close it then. |
2532 | */ |
2533 | if (c->remoteid != -1) { |
2534 | if (ssh_version == 1) { |
2535 | send_packet(SSH1_MSG_CHANNEL_CLOSE, PKT_INT, c->remoteid, |
2536 | PKT_END); |
2537 | } else { |
2538 | ssh2_pkt_init(SSH2_MSG_CHANNEL_CLOSE); |
2539 | ssh2_pkt_adduint32(c->remoteid); |
2540 | ssh2_pkt_send(); |
2541 | } |
32874aea |
2542 | } |
2543 | c->closes = 1; |
2544 | if (c->type == CHAN_X11) { |
2545 | c->u.x11.s = NULL; |
d74d141c |
2546 | logevent("Forwarded X11 connection terminated"); |
4ed34d25 |
2547 | } else if (c->type == CHAN_SOCKDATA || |
2548 | c->type == CHAN_SOCKDATA_DORMANT) { |
d74d141c |
2549 | c->u.pfd.s = NULL; |
2550 | logevent("Forwarded port closed"); |
32874aea |
2551 | } |
2552 | } |
2553 | } |
2554 | |
5471d09a |
2555 | int sshfwd_write(struct ssh_channel *c, char *buf, int len) |
32874aea |
2556 | { |
783415f8 |
2557 | if (ssh_version == 1) { |
32874aea |
2558 | send_packet(SSH1_MSG_CHANNEL_DATA, |
2559 | PKT_INT, c->remoteid, |
2560 | PKT_INT, len, PKT_DATA, buf, len, PKT_END); |
5471d09a |
2561 | /* |
2562 | * In SSH1 we can return 0 here - implying that forwarded |
2563 | * connections are never individually throttled - because |
2564 | * the only circumstance that can cause throttling will be |
2565 | * the whole SSH connection backing up, in which case |
2566 | * _everything_ will be throttled as a whole. |
2567 | */ |
2568 | return 0; |
783415f8 |
2569 | } else { |
32874aea |
2570 | ssh2_add_channel_data(c, buf, len); |
5471d09a |
2571 | return ssh2_try_send(c); |
2572 | } |
2573 | } |
2574 | |
2575 | void sshfwd_unthrottle(struct ssh_channel *c, int bufsize) |
2576 | { |
2577 | if (ssh_version == 1) { |
2578 | if (c->v.v1.throttling && bufsize < SSH1_BUFFER_LIMIT) { |
2579 | c->v.v1.throttling = 0; |
2580 | ssh1_throttle(-1); |
2581 | } |
2582 | } else { |
2583 | ssh2_set_window(c, OUR_V2_WINSIZE - bufsize); |
783415f8 |
2584 | } |
9c964e85 |
2585 | } |
2586 | |
32874aea |
2587 | static void ssh1_protocol(unsigned char *in, int inlen, int ispkt) |
2588 | { |
fb09bf1c |
2589 | crBegin; |
2590 | |
2591 | random_init(); |
2592 | |
e5574168 |
2593 | while (!do_ssh1_login(in, inlen, ispkt)) { |
fb09bf1c |
2594 | crReturnV; |
85ee8208 |
2595 | } |
2596 | if (ssh_state == SSH_STATE_CLOSED) |
32874aea |
2597 | crReturnV; |
fb09bf1c |
2598 | |
979310f1 |
2599 | if (cfg.agentfwd && agent_exists()) { |
32874aea |
2600 | logevent("Requesting agent forwarding"); |
2601 | send_packet(SSH1_CMSG_AGENT_REQUEST_FORWARDING, PKT_END); |
2602 | do { |
2603 | crReturnV; |
2604 | } while (!ispkt); |
2605 | if (pktin.type != SSH1_SMSG_SUCCESS |
2606 | && pktin.type != SSH1_SMSG_FAILURE) { |
2607 | bombout(("Protocol confusion")); |
2608 | crReturnV; |
2609 | } else if (pktin.type == SSH1_SMSG_FAILURE) { |
2610 | logevent("Agent forwarding refused"); |
2611 | } else { |
2612 | logevent("Agent forwarding enabled"); |
db7d555c |
2613 | ssh_agentfwd_enabled = TRUE; |
2614 | } |
dacbd0e8 |
2615 | } |
2616 | |
9c964e85 |
2617 | if (cfg.x11_forward) { |
32874aea |
2618 | char proto[20], data[64]; |
2619 | logevent("Requesting X11 forwarding"); |
2620 | x11_invent_auth(proto, sizeof(proto), data, sizeof(data)); |
2621 | if (ssh1_local_protoflags & SSH1_PROTOFLAG_SCREEN_NUMBER) { |
2622 | send_packet(SSH1_CMSG_X11_REQUEST_FORWARDING, |
2623 | PKT_STR, proto, PKT_STR, data, |
2624 | PKT_INT, 0, PKT_END); |
2625 | } else { |
2626 | send_packet(SSH1_CMSG_X11_REQUEST_FORWARDING, |
2627 | PKT_STR, proto, PKT_STR, data, PKT_END); |
2628 | } |
2629 | do { |
2630 | crReturnV; |
2631 | } while (!ispkt); |
2632 | if (pktin.type != SSH1_SMSG_SUCCESS |
2633 | && pktin.type != SSH1_SMSG_FAILURE) { |
2634 | bombout(("Protocol confusion")); |
2635 | crReturnV; |
2636 | } else if (pktin.type == SSH1_SMSG_FAILURE) { |
2637 | logevent("X11 forwarding refused"); |
2638 | } else { |
2639 | logevent("X11 forwarding enabled"); |
9c964e85 |
2640 | ssh_X11_fwd_enabled = TRUE; |
2641 | } |
2642 | } |
2643 | |
d74d141c |
2644 | { |
2645 | char type, *e; |
2646 | int n; |
2647 | int sport,dport; |
2648 | char sports[256], dports[256], host[256]; |
2649 | char buf[1024]; |
2650 | |
bc240b21 |
2651 | ssh_rportfwds = newtree234(ssh_rportcmp_ssh1); |
d74d141c |
2652 | /* Add port forwardings. */ |
2653 | e = cfg.portfwd; |
2654 | while (*e) { |
2655 | type = *e++; |
2656 | n = 0; |
2657 | while (*e && *e != '\t') |
2658 | sports[n++] = *e++; |
2659 | sports[n] = 0; |
2660 | if (*e == '\t') |
2661 | e++; |
2662 | n = 0; |
2663 | while (*e && *e != ':') |
2664 | host[n++] = *e++; |
2665 | host[n] = 0; |
2666 | if (*e == ':') |
2667 | e++; |
2668 | n = 0; |
2669 | while (*e) |
2670 | dports[n++] = *e++; |
2671 | dports[n] = 0; |
2672 | e++; |
2673 | dport = atoi(dports); |
2674 | sport = atoi(sports); |
2675 | if (sport && dport) { |
2676 | if (type == 'L') { |
2677 | pfd_addforward(host, dport, sport); |
2678 | sprintf(buf, "Local port %d forwarding to %s:%d", |
2679 | sport, host, dport); |
2680 | logevent(buf); |
2681 | } else { |
2682 | struct ssh_rportfwd *pf; |
2683 | pf = smalloc(sizeof(*pf)); |
bc240b21 |
2684 | strcpy(pf->dhost, host); |
2685 | pf->dport = dport; |
d74d141c |
2686 | if (add234(ssh_rportfwds, pf) != pf) { |
2687 | sprintf(buf, |
95bc8819 |
2688 | "Duplicate remote port forwarding to %s:%d", |
d74d141c |
2689 | host, dport); |
2690 | logevent(buf); |
bc240b21 |
2691 | sfree(pf); |
d74d141c |
2692 | } else { |
2693 | sprintf(buf, "Requesting remote port %d forward to %s:%d", |
2694 | sport, host, dport); |
2695 | logevent(buf); |
2696 | send_packet(SSH1_CMSG_PORT_FORWARD_REQUEST, |
2697 | PKT_INT, sport, |
2698 | PKT_STR, host, |
2699 | PKT_INT, dport, |
2700 | PKT_END); |
2701 | } |
2702 | } |
2703 | } |
2704 | } |
2705 | } |
2706 | |
fef97f43 |
2707 | if (!cfg.nopty) { |
e5574168 |
2708 | send_packet(SSH1_CMSG_REQUEST_PTY, |
32874aea |
2709 | PKT_STR, cfg.termtype, |
2710 | PKT_INT, rows, PKT_INT, cols, |
2711 | PKT_INT, 0, PKT_INT, 0, PKT_CHAR, 0, PKT_END); |
2712 | ssh_state = SSH_STATE_INTERMED; |
2713 | do { |
2714 | crReturnV; |
2715 | } while (!ispkt); |
2716 | if (pktin.type != SSH1_SMSG_SUCCESS |
2717 | && pktin.type != SSH1_SMSG_FAILURE) { |
2718 | bombout(("Protocol confusion")); |
2719 | crReturnV; |
2720 | } else if (pktin.type == SSH1_SMSG_FAILURE) { |
2721 | c_write_str("Server refused to allocate pty\r\n"); |
2722 | ssh_editing = ssh_echoing = 1; |
2723 | } |
c5e9c988 |
2724 | logevent("Allocated pty"); |
0965bee0 |
2725 | } else { |
32874aea |
2726 | ssh_editing = ssh_echoing = 1; |
374330e2 |
2727 | } |
2728 | |
4ba9b64b |
2729 | if (cfg.compression) { |
32874aea |
2730 | send_packet(SSH1_CMSG_REQUEST_COMPRESSION, PKT_INT, 6, PKT_END); |
2731 | do { |
2732 | crReturnV; |
2733 | } while (!ispkt); |
2734 | if (pktin.type != SSH1_SMSG_SUCCESS |
2735 | && pktin.type != SSH1_SMSG_FAILURE) { |
2736 | bombout(("Protocol confusion")); |
2737 | crReturnV; |
2738 | } else if (pktin.type == SSH1_SMSG_FAILURE) { |
2739 | c_write_str("Server refused to compress\r\n"); |
2740 | } |
4ba9b64b |
2741 | logevent("Started compression"); |
2742 | ssh1_compressing = TRUE; |
2743 | zlib_compress_init(); |
2744 | zlib_decompress_init(); |
2745 | } |
2746 | |
fd5e5847 |
2747 | /* |
2748 | * Start the shell or command. |
2749 | * |
2750 | * Special case: if the first-choice command is an SSH2 |
2751 | * subsystem (hence not usable here) and the second choice |
2752 | * exists, we fall straight back to that. |
2753 | */ |
2754 | { |
2755 | char *cmd = cfg.remote_cmd_ptr; |
2756 | |
2757 | if (cfg.ssh_subsys && cfg.remote_cmd_ptr2) { |
2758 | cmd = cfg.remote_cmd_ptr2; |
2759 | ssh_fallback_cmd = TRUE; |
2760 | } |
2761 | if (*cmd) |
2762 | send_packet(SSH1_CMSG_EXEC_CMD, PKT_STR, cmd, PKT_END); |
2763 | else |
2764 | send_packet(SSH1_CMSG_EXEC_SHELL, PKT_END); |
2765 | logevent("Started session"); |
2766 | } |
374330e2 |
2767 | |
2768 | ssh_state = SSH_STATE_SESSION; |
2769 | if (size_needed) |
2770 | ssh_size(); |
3687d221 |
2771 | if (eof_needed) |
32874aea |
2772 | ssh_special(TS_EOF); |
374330e2 |
2773 | |
760e88b2 |
2774 | ldisc_send(NULL, 0, 0); /* cause ldisc to notice changes */ |
8ccc75b0 |
2775 | ssh_send_ok = 1; |
dacbd0e8 |
2776 | ssh_channels = newtree234(ssh_channelcmp); |
374330e2 |
2777 | while (1) { |
2778 | crReturnV; |
2779 | if (ispkt) { |
e5574168 |
2780 | if (pktin.type == SSH1_SMSG_STDOUT_DATA || |
32874aea |
2781 | pktin.type == SSH1_SMSG_STDERR_DATA) { |
fb09bf1c |
2782 | long len = GET_32BIT(pktin.body); |
5471d09a |
2783 | int bufsize = |
2784 | from_backend(pktin.type == SSH1_SMSG_STDERR_DATA, |
2785 | pktin.body + 4, len); |
90347b95 |
2786 | if (!ssh1_stdout_throttling && bufsize > SSH1_BUFFER_LIMIT) { |
5471d09a |
2787 | ssh1_stdout_throttling = 1; |
2788 | ssh1_throttle(+1); |
2789 | } |
e5574168 |
2790 | } else if (pktin.type == SSH1_MSG_DISCONNECT) { |
32874aea |
2791 | ssh_state = SSH_STATE_CLOSED; |
c5e9c988 |
2792 | logevent("Received disconnect request"); |
32874aea |
2793 | crReturnV; |
2794 | } else if (pktin.type == SSH1_SMSG_X11_OPEN) { |
2795 | /* Remote side is trying to open a channel to talk to our |
2796 | * X-Server. Give them back a local channel number. */ |
2797 | struct ssh_channel *c; |
9c964e85 |
2798 | |
2799 | logevent("Received X11 connect request"); |
2800 | /* Refuse if X11 forwarding is disabled. */ |
2801 | if (!ssh_X11_fwd_enabled) { |
2802 | send_packet(SSH1_MSG_CHANNEL_OPEN_FAILURE, |
32874aea |
2803 | PKT_INT, GET_32BIT(pktin.body), PKT_END); |
9c964e85 |
2804 | logevent("Rejected X11 connect request"); |
2805 | } else { |
9c964e85 |
2806 | c = smalloc(sizeof(struct ssh_channel)); |
2807 | |
32874aea |
2808 | if (x11_init(&c->u.x11.s, cfg.x11_display, c) != NULL) { |
2809 | logevent("opening X11 forward connection failed"); |
2810 | sfree(c); |
2811 | send_packet(SSH1_MSG_CHANNEL_OPEN_FAILURE, |
2812 | PKT_INT, GET_32BIT(pktin.body), |
2813 | PKT_END); |
9c964e85 |
2814 | } else { |
32874aea |
2815 | logevent |
2816 | ("opening X11 forward connection succeeded"); |
2817 | c->remoteid = GET_32BIT(pktin.body); |
2818 | c->localid = alloc_channel_id(); |
2819 | c->closes = 0; |
5471d09a |
2820 | c->v.v1.throttling = 0; |
32874aea |
2821 | c->type = CHAN_X11; /* identify channel type */ |
2822 | add234(ssh_channels, c); |
2823 | send_packet(SSH1_MSG_CHANNEL_OPEN_CONFIRMATION, |
2824 | PKT_INT, c->remoteid, PKT_INT, |
2825 | c->localid, PKT_END); |
2826 | logevent("Opened X11 forward channel"); |
9c964e85 |
2827 | } |
2828 | } |
32874aea |
2829 | } else if (pktin.type == SSH1_SMSG_AGENT_OPEN) { |
2830 | /* Remote side is trying to open a channel to talk to our |
2831 | * agent. Give them back a local channel number. */ |
2832 | struct ssh_channel *c; |
db7d555c |
2833 | |
2834 | /* Refuse if agent forwarding is disabled. */ |
2835 | if (!ssh_agentfwd_enabled) { |
2836 | send_packet(SSH1_MSG_CHANNEL_OPEN_FAILURE, |
32874aea |
2837 | PKT_INT, GET_32BIT(pktin.body), PKT_END); |
db7d555c |
2838 | } else { |
dcbde236 |
2839 | c = smalloc(sizeof(struct ssh_channel)); |
db7d555c |
2840 | c->remoteid = GET_32BIT(pktin.body); |
d2371c81 |
2841 | c->localid = alloc_channel_id(); |
db7d555c |
2842 | c->closes = 0; |
5471d09a |
2843 | c->v.v1.throttling = 0; |
32874aea |
2844 | c->type = CHAN_AGENT; /* identify channel type */ |
db7d555c |
2845 | c->u.a.lensofar = 0; |
2846 | add234(ssh_channels, c); |
2847 | send_packet(SSH1_MSG_CHANNEL_OPEN_CONFIRMATION, |
2848 | PKT_INT, c->remoteid, PKT_INT, c->localid, |
2849 | PKT_END); |
2850 | } |
d74d141c |
2851 | } else if (pktin.type == SSH1_MSG_PORT_OPEN) { |
2852 | /* Remote side is trying to open a channel to talk to a |
2853 | * forwarded port. Give them back a local channel number. */ |
2854 | struct ssh_channel *c; |
2855 | struct ssh_rportfwd pf; |
2856 | int hostsize, port; |
2857 | char host[256], buf[1024]; |
2858 | char *p, *h, *e; |
2859 | c = smalloc(sizeof(struct ssh_channel)); |
2860 | |
2861 | hostsize = GET_32BIT(pktin.body+4); |
2862 | for(h = host, p = pktin.body+8; hostsize != 0; hostsize--) { |
2863 | if (h+1 < host+sizeof(host)) |
2864 | *h++ = *p; |
95bc8819 |
2865 | p++; |
d74d141c |
2866 | } |
2867 | *h = 0; |
2868 | port = GET_32BIT(p); |
2869 | |
bc240b21 |
2870 | strcpy(pf.dhost, host); |
2871 | pf.dport = port; |
d74d141c |
2872 | |
2873 | if (find234(ssh_rportfwds, &pf, NULL) == NULL) { |
2874 | sprintf(buf, "Rejected remote port open request for %s:%d", |
2875 | host, port); |
2876 | logevent(buf); |
2877 | send_packet(SSH1_MSG_CHANNEL_OPEN_FAILURE, |
2878 | PKT_INT, GET_32BIT(pktin.body), PKT_END); |
2879 | } else { |
2880 | sprintf(buf, "Received remote port open request for %s:%d", |
2881 | host, port); |
2882 | logevent(buf); |
2883 | e = pfd_newconnect(&c->u.pfd.s, host, port, c); |
2884 | if (e != NULL) { |
2885 | char buf[256]; |
2886 | sprintf(buf, "Port open failed: %s", e); |
2887 | logevent(buf); |
2888 | sfree(c); |
2889 | send_packet(SSH1_MSG_CHANNEL_OPEN_FAILURE, |
2890 | PKT_INT, GET_32BIT(pktin.body), |
2891 | PKT_END); |
2892 | } else { |
2893 | c->remoteid = GET_32BIT(pktin.body); |
2894 | c->localid = alloc_channel_id(); |
2895 | c->closes = 0; |
5471d09a |
2896 | c->v.v1.throttling = 0; |
d74d141c |
2897 | c->type = CHAN_SOCKDATA; /* identify channel type */ |
2898 | add234(ssh_channels, c); |
2899 | send_packet(SSH1_MSG_CHANNEL_OPEN_CONFIRMATION, |
2900 | PKT_INT, c->remoteid, PKT_INT, |
2901 | c->localid, PKT_END); |
2902 | logevent("Forwarded port opened successfully"); |
2903 | } |
2904 | } |
2905 | |
2906 | } else if (pktin.type == SSH1_MSG_CHANNEL_OPEN_CONFIRMATION) { |
bc240b21 |
2907 | unsigned int remoteid = GET_32BIT(pktin.body); |
2908 | unsigned int localid = GET_32BIT(pktin.body+4); |
2909 | struct ssh_channel *c; |
2910 | |
2911 | c = find234(ssh_channels, &remoteid, ssh_channelfind); |
2912 | if (c && c->type == CHAN_SOCKDATA_DORMANT) { |
2913 | c->remoteid = localid; |
2914 | c->type = CHAN_SOCKDATA; |
7781f316 |
2915 | c->v.v1.throttling = 0; |
bc240b21 |
2916 | pfd_confirm(c->u.pfd.s); |
2917 | } |
d74d141c |
2918 | |
4ed34d25 |
2919 | if (c && c->closes) { |
2920 | /* |
2921 | * We have a pending close on this channel, |
2922 | * which we decided on before the server acked |
2923 | * the channel open. So now we know the |
2924 | * remoteid, we can close it again. |
2925 | */ |
2926 | send_packet(SSH1_MSG_CHANNEL_CLOSE, PKT_INT, c->remoteid, |
2927 | PKT_END); |
2928 | } |
2929 | |
724cface |
2930 | } else if (pktin.type == SSH1_MSG_CHANNEL_OPEN_FAILURE) { |
2931 | unsigned int remoteid = GET_32BIT(pktin.body); |
2932 | unsigned int localid = GET_32BIT(pktin.body+4); |
2933 | struct ssh_channel *c; |
2934 | |
2935 | c = find234(ssh_channels, &remoteid, ssh_channelfind); |
2936 | if (c && c->type == CHAN_SOCKDATA_DORMANT) { |
2937 | logevent("Forwarded connection refused by server"); |
2938 | pfd_close(c->u.pfd.s); |
2939 | del234(ssh_channels, c); |
2940 | sfree(c); |
2941 | } |
2942 | |
db7d555c |
2943 | } else if (pktin.type == SSH1_MSG_CHANNEL_CLOSE || |
2944 | pktin.type == SSH1_MSG_CHANNEL_CLOSE_CONFIRMATION) { |
32874aea |
2945 | /* Remote side closes a channel. */ |
2946 | unsigned i = GET_32BIT(pktin.body); |
2947 | struct ssh_channel *c; |
2948 | c = find234(ssh_channels, &i, ssh_channelfind); |
2949 | if (c) { |
2950 | int closetype; |
2951 | closetype = |
2952 | (pktin.type == SSH1_MSG_CHANNEL_CLOSE ? 1 : 2); |
2953 | if (!(c->closes & closetype)) |
2954 | send_packet(pktin.type, PKT_INT, c->remoteid, |
2955 | PKT_END); |
783415f8 |
2956 | if ((c->closes == 0) && (c->type == CHAN_X11)) { |
d74d141c |
2957 | logevent("Forwarded X11 connection terminated"); |
9c964e85 |
2958 | assert(c->u.x11.s != NULL); |
2959 | x11_close(c->u.x11.s); |
2960 | c->u.x11.s = NULL; |
2961 | } |
d74d141c |
2962 | if ((c->closes == 0) && (c->type == CHAN_SOCKDATA)) { |
2963 | logevent("Forwarded port closed"); |
2964 | assert(c->u.pfd.s != NULL); |
2965 | pfd_close(c->u.pfd.s); |
2966 | c->u.pfd.s = NULL; |
2967 | } |
32874aea |
2968 | c->closes |= closetype; |
2969 | if (c->closes == 3) { |
2970 | del234(ssh_channels, c); |
2971 | sfree(c); |
2972 | } |
2973 | } |
2974 | } else if (pktin.type == SSH1_MSG_CHANNEL_DATA) { |
2975 | /* Data sent down one of our channels. */ |
2976 | int i = GET_32BIT(pktin.body); |
2977 | int len = GET_32BIT(pktin.body + 4); |
2978 | unsigned char *p = pktin.body + 8; |
2979 | struct ssh_channel *c; |
2980 | c = find234(ssh_channels, &i, ssh_channelfind); |
2981 | if (c) { |
5471d09a |
2982 | int bufsize; |
32874aea |
2983 | switch (c->type) { |
2984 | case CHAN_X11: |
5471d09a |
2985 | bufsize = x11_send(c->u.x11.s, p, len); |
9c964e85 |
2986 | break; |
d74d141c |
2987 | case CHAN_SOCKDATA: |
5471d09a |
2988 | bufsize = pfd_send(c->u.pfd.s, p, len); |
bc240b21 |
2989 | break; |
32874aea |
2990 | case CHAN_AGENT: |
2991 | /* Data for an agent message. Buffer it. */ |
2992 | while (len > 0) { |
2993 | if (c->u.a.lensofar < 4) { |
2994 | int l = min(4 - c->u.a.lensofar, len); |
2995 | memcpy(c->u.a.msglen + c->u.a.lensofar, p, |
2996 | l); |
2997 | p += l; |
2998 | len -= l; |
2999 | c->u.a.lensofar += l; |
3000 | } |
3001 | if (c->u.a.lensofar == 4) { |
3002 | c->u.a.totallen = |
3003 | 4 + GET_32BIT(c->u.a.msglen); |
3004 | c->u.a.message = smalloc(c->u.a.totallen); |
3005 | memcpy(c->u.a.message, c->u.a.msglen, 4); |
3006 | } |
3007 | if (c->u.a.lensofar >= 4 && len > 0) { |
3008 | int l = |
3009 | min(c->u.a.totallen - c->u.a.lensofar, |
3010 | len); |
3011 | memcpy(c->u.a.message + c->u.a.lensofar, p, |
3012 | l); |
3013 | p += l; |
3014 | len -= l; |
3015 | c->u.a.lensofar += l; |
3016 | } |
3017 | if (c->u.a.lensofar == c->u.a.totallen) { |
3018 | void *reply, *sentreply; |
3019 | int replylen; |
3020 | agent_query(c->u.a.message, |
3021 | c->u.a.totallen, &reply, |
3022 | &replylen); |
3023 | if (reply) |
3024 | sentreply = reply; |
3025 | else { |
3026 | /* Fake SSH_AGENT_FAILURE. */ |
3027 | sentreply = "\0\0\0\1\5"; |
3028 | replylen = 5; |
3029 | } |
3030 | send_packet(SSH1_MSG_CHANNEL_DATA, |
3031 | PKT_INT, c->remoteid, |
3032 | PKT_INT, replylen, |
3033 | PKT_DATA, sentreply, replylen, |
3034 | PKT_END); |
3035 | if (reply) |
3036 | sfree(reply); |
3037 | sfree(c->u.a.message); |
3038 | c->u.a.lensofar = 0; |
3039 | } |
3040 | } |
5471d09a |
3041 | bufsize = 0; /* agent channels never back up */ |
32874aea |
3042 | break; |
3043 | } |
90347b95 |
3044 | if (!c->v.v1.throttling && bufsize > SSH1_BUFFER_LIMIT) { |
5471d09a |
3045 | c->v.v1.throttling = 1; |
3046 | ssh1_throttle(+1); |
3047 | } |
32874aea |
3048 | } |
e5574168 |
3049 | } else if (pktin.type == SSH1_SMSG_SUCCESS) { |
972a41c8 |
3050 | /* may be from EXEC_SHELL on some servers */ |
e5574168 |
3051 | } else if (pktin.type == SSH1_SMSG_FAILURE) { |
972a41c8 |
3052 | /* may be from EXEC_SHELL on some servers |
374330e2 |
3053 | * if no pty is available or in other odd cases. Ignore */ |
e5574168 |
3054 | } else if (pktin.type == SSH1_SMSG_EXIT_STATUS) { |
3055 | send_packet(SSH1_CMSG_EXIT_CONFIRMATION, PKT_END); |
4252c9cc |
3056 | /* |
3057 | * In case `helpful' firewalls or proxies tack |
3058 | * extra human-readable text on the end of the |
3059 | * session which we might mistake for another |
3060 | * encrypted packet, we close the session once |
3061 | * we've sent EXIT_CONFIRMATION. |
3062 | */ |
3063 | ssh_state = SSH_STATE_CLOSED; |
3064 | crReturnV; |
374330e2 |
3065 | } else { |
8d5de777 |
3066 | bombout(("Strange packet received: type %d", pktin.type)); |
32874aea |
3067 | crReturnV; |
374330e2 |
3068 | } |
3069 | } else { |
8df7a775 |
3070 | while (inlen > 0) { |
3071 | int len = min(inlen, 512); |
3072 | send_packet(SSH1_CMSG_STDIN_DATA, |
3073 | PKT_INT, len, PKT_DATA, in, len, PKT_END); |
3074 | in += len; |
3075 | inlen -= len; |
3076 | } |
374330e2 |
3077 | } |
3078 | } |
3079 | |
3080 | crFinishV; |
3081 | } |
3082 | |
3083 | /* |
e5574168 |
3084 | * Utility routine for decoding comma-separated strings in KEXINIT. |
3085 | */ |
32874aea |
3086 | static int in_commasep_string(char *needle, char *haystack, int haylen) |
3087 | { |
e5574168 |
3088 | int needlen = strlen(needle); |
3089 | while (1) { |
32874aea |
3090 | /* |
3091 | * Is it at the start of the string? |
3092 | */ |
3093 | if (haylen >= needlen && /* haystack is long enough */ |
3094 | !memcmp(needle, haystack, needlen) && /* initial match */ |
3095 | (haylen == needlen || haystack[needlen] == ',') |
3096 | /* either , or EOS follows */ |
3097 | ) |
3098 | return 1; |
3099 | /* |
3100 | * If not, search for the next comma and resume after that. |
3101 | * If no comma found, terminate. |
3102 | */ |
3103 | while (haylen > 0 && *haystack != ',') |
3104 | haylen--, haystack++; |
3105 | if (haylen == 0) |
3106 | return 0; |
3107 | haylen--, haystack++; /* skip over comma itself */ |
e5574168 |
3108 | } |
3109 | } |
3110 | |
3111 | /* |
d39f364a |
3112 | * SSH2 key creation method. |
3113 | */ |
32874aea |
3114 | static void ssh2_mkkey(Bignum K, char *H, char *sessid, char chr, |
3115 | char *keyspace) |
3116 | { |
d39f364a |
3117 | SHA_State s; |
3118 | /* First 20 bytes. */ |
3119 | SHA_Init(&s); |
3120 | sha_mpint(&s, K); |
3121 | SHA_Bytes(&s, H, 20); |
3122 | SHA_Bytes(&s, &chr, 1); |
5e0d7cb8 |
3123 | SHA_Bytes(&s, sessid, 20); |
d39f364a |
3124 | SHA_Final(&s, keyspace); |
3125 | /* Next 20 bytes. */ |
3126 | SHA_Init(&s); |
3127 | sha_mpint(&s, K); |
3128 | SHA_Bytes(&s, H, 20); |
3129 | SHA_Bytes(&s, keyspace, 20); |
32874aea |
3130 | SHA_Final(&s, keyspace + 20); |
d39f364a |
3131 | } |
3132 | |
3133 | /* |
7cca0d81 |
3134 | * Handle the SSH2 transport layer. |
e5574168 |
3135 | */ |
7cca0d81 |
3136 | static int do_ssh2_transport(unsigned char *in, int inlen, int ispkt) |
e5574168 |
3137 | { |
ca20bfcf |
3138 | static int i, j, len, nbits, pbits, warn; |
e5574168 |
3139 | static char *str; |
a92dd380 |
3140 | static Bignum p, g, e, f, K; |
3141 | static int kex_init_value, kex_reply_value; |
7591b9ff |
3142 | static const struct ssh_mac **maclist; |
8b2715b2 |
3143 | static int nmacs; |
0a3f1d48 |
3144 | static const struct ssh2_cipher *cscipher_tobe = NULL; |
3145 | static const struct ssh2_cipher *sccipher_tobe = NULL; |
57476f6b |
3146 | static const struct ssh_mac *csmac_tobe = NULL; |
3147 | static const struct ssh_mac *scmac_tobe = NULL; |
3148 | static const struct ssh_compress *cscomp_tobe = NULL; |
3149 | static const struct ssh_compress *sccomp_tobe = NULL; |
d5859615 |
3150 | static char *hostkeydata, *sigdata, *keystr, *fingerprint; |
e5574168 |
3151 | static int hostkeylen, siglen; |
e055a386 |
3152 | static void *hkey; /* actual host key */ |
e5574168 |
3153 | static unsigned char exchange_hash[20]; |
d39f364a |
3154 | static unsigned char keyspace[40]; |
ca20bfcf |
3155 | static int n_preferred_ciphers; |
3156 | static const struct ssh2_ciphers *preferred_ciphers[CIPHER_MAX]; |
4ba9b64b |
3157 | static const struct ssh_compress *preferred_comp; |
0db56f73 |
3158 | static int first_kex; |
e5574168 |
3159 | |
3160 | crBegin; |
7cca0d81 |
3161 | random_init(); |
0db56f73 |
3162 | first_kex = 1; |
e5574168 |
3163 | |
5e8358ad |
3164 | /* |
ca20bfcf |
3165 | * Set up the preferred ciphers. (NULL => warn below here) |
5e8358ad |
3166 | */ |
ca20bfcf |
3167 | n_preferred_ciphers = 0; |
3168 | for (i = 0; i < CIPHER_MAX; i++) { |
3169 | switch (cfg.ssh_cipherlist[i]) { |
3170 | case CIPHER_BLOWFISH: |
3171 | preferred_ciphers[n_preferred_ciphers] = &ssh2_blowfish; |
3172 | n_preferred_ciphers++; |
3173 | break; |
3174 | case CIPHER_DES: |
3175 | /* Not supported in SSH2; silently drop */ |
3176 | break; |
3177 | case CIPHER_3DES: |
3178 | preferred_ciphers[n_preferred_ciphers] = &ssh2_3des; |
3179 | n_preferred_ciphers++; |
3180 | break; |
3181 | case CIPHER_AES: |
3182 | preferred_ciphers[n_preferred_ciphers] = &ssh2_aes; |
3183 | n_preferred_ciphers++; |
3184 | break; |
3185 | case CIPHER_WARN: |
3186 | /* Flag for later. Don't bother if it's the last in |
3187 | * the list. */ |
3188 | if (i < CIPHER_MAX - 1) { |
3189 | preferred_ciphers[n_preferred_ciphers] = NULL; |
3190 | n_preferred_ciphers++; |
3191 | } |
3192 | break; |
3193 | } |
5e8358ad |
3194 | } |
ca20bfcf |
3195 | |
3196 | /* |
3197 | * Set up preferred compression. |
3198 | */ |
4ba9b64b |
3199 | if (cfg.compression) |
3200 | preferred_comp = &ssh_zlib; |
3201 | else |
3202 | preferred_comp = &ssh_comp_none; |
5e8358ad |
3203 | |
7591b9ff |
3204 | /* |
3205 | * Be prepared to work around the buggy MAC problem. |
3206 | */ |
7d503c31 |
3207 | if (cfg.buggymac || (ssh_remote_bugs & BUG_SSH2_HMAC)) |
32874aea |
3208 | maclist = buggymacs, nmacs = lenof(buggymacs); |
7591b9ff |
3209 | else |
32874aea |
3210 | maclist = macs, nmacs = lenof(macs); |
7591b9ff |
3211 | |
32874aea |
3212 | begin_key_exchange: |
e5574168 |
3213 | /* |
3214 | * Construct and send our key exchange packet. |
3215 | */ |
3216 | ssh2_pkt_init(SSH2_MSG_KEXINIT); |
3217 | for (i = 0; i < 16; i++) |
32874aea |
3218 | ssh2_pkt_addbyte((unsigned char) random_byte()); |
e5574168 |
3219 | /* List key exchange algorithms. */ |
3220 | ssh2_pkt_addstring_start(); |
3221 | for (i = 0; i < lenof(kex_algs); i++) { |
32874aea |
3222 | ssh2_pkt_addstring_str(kex_algs[i]->name); |
3223 | if (i < lenof(kex_algs) - 1) |
3224 | ssh2_pkt_addstring_str(","); |
e5574168 |
3225 | } |
3226 | /* List server host key algorithms. */ |
3227 | ssh2_pkt_addstring_start(); |
3228 | for (i = 0; i < lenof(hostkey_algs); i++) { |
32874aea |
3229 | ssh2_pkt_addstring_str(hostkey_algs[i]->name); |
3230 | if (i < lenof(hostkey_algs) - 1) |
3231 | ssh2_pkt_addstring_str(","); |
e5574168 |
3232 | } |
3233 | /* List client->server encryption algorithms. */ |
3234 | ssh2_pkt_addstring_start(); |
ca20bfcf |
3235 | for (i = 0; i < n_preferred_ciphers; i++) { |
3236 | const struct ssh2_ciphers *c = preferred_ciphers[i]; |
3237 | if (!c) continue; /* warning flag */ |
32874aea |
3238 | for (j = 0; j < c->nciphers; j++) { |
3239 | ssh2_pkt_addstring_str(c->list[j]->name); |
ca20bfcf |
3240 | if (i < n_preferred_ciphers || j < c->nciphers - 1) |
32874aea |
3241 | ssh2_pkt_addstring_str(","); |
3242 | } |
e5574168 |
3243 | } |
3244 | /* List server->client encryption algorithms. */ |
3245 | ssh2_pkt_addstring_start(); |
ca20bfcf |
3246 | for (i = 0; i < n_preferred_ciphers; i++) { |
3247 | const struct ssh2_ciphers *c = preferred_ciphers[i]; |
3248 | if (!c) continue; /* warning flag */ |
32874aea |
3249 | for (j = 0; j < c->nciphers; j++) { |
3250 | ssh2_pkt_addstring_str(c->list[j]->name); |
ca20bfcf |
3251 | if (i < n_preferred_ciphers || j < c->nciphers - 1) |
32874aea |
3252 | ssh2_pkt_addstring_str(","); |
3253 | } |
e5574168 |
3254 | } |
3255 | /* List client->server MAC algorithms. */ |
3256 | ssh2_pkt_addstring_start(); |
8b2715b2 |
3257 | for (i = 0; i < nmacs; i++) { |
32874aea |
3258 | ssh2_pkt_addstring_str(maclist[i]->name); |
3259 | if (i < nmacs - 1) |
3260 | ssh2_pkt_addstring_str(","); |
e5574168 |
3261 | } |
3262 | /* List server->client MAC algorithms. */ |
3263 | ssh2_pkt_addstring_start(); |
8b2715b2 |
3264 | for (i = 0; i < nmacs; i++) { |
32874aea |
3265 | ssh2_pkt_addstring_str(maclist[i]->name); |
3266 | if (i < nmacs - 1) |
3267 | ssh2_pkt_addstring_str(","); |
e5574168 |
3268 | } |
3269 | /* List client->server compression algorithms. */ |
3270 | ssh2_pkt_addstring_start(); |
32874aea |
3271 | for (i = 0; i < lenof(compressions) + 1; i++) { |
3272 | const struct ssh_compress *c = |
3273 | i == 0 ? preferred_comp : compressions[i - 1]; |
3274 | ssh2_pkt_addstring_str(c->name); |
3275 | if (i < lenof(compressions)) |
3276 | ssh2_pkt_addstring_str(","); |
e5574168 |
3277 | } |
3278 | /* List server->client compression algorithms. */ |
3279 | ssh2_pkt_addstring_start(); |
32874aea |
3280 | for (i = 0; i < lenof(compressions) + 1; i++) { |
3281 | const struct ssh_compress *c = |
3282 | i == 0 ? preferred_comp : compressions[i - 1]; |
3283 | ssh2_pkt_addstring_str(c->name); |
3284 | if (i < lenof(compressions)) |
3285 | ssh2_pkt_addstring_str(","); |
e5574168 |
3286 | } |
3287 | /* List client->server languages. Empty list. */ |
3288 | ssh2_pkt_addstring_start(); |
3289 | /* List server->client languages. Empty list. */ |
3290 | ssh2_pkt_addstring_start(); |
3291 | /* First KEX packet does _not_ follow, because we're not that brave. */ |
3292 | ssh2_pkt_addbool(FALSE); |
3293 | /* Reserved. */ |
3294 | ssh2_pkt_adduint32(0); |
0db56f73 |
3295 | |
3296 | exhash = exhashbase; |
32874aea |
3297 | sha_string(&exhash, pktout.data + 5, pktout.length - 5); |
0db56f73 |
3298 | |
e5574168 |
3299 | ssh2_pkt_send(); |
3300 | |
32874aea |
3301 | if (!ispkt) |
3302 | crWaitUntil(ispkt); |
3303 | sha_string(&exhash, pktin.data + 5, pktin.length - 5); |
e5574168 |
3304 | |
3305 | /* |
3306 | * Now examine the other side's KEXINIT to see what we're up |
3307 | * to. |
3308 | */ |
7cca0d81 |
3309 | if (pktin.type != SSH2_MSG_KEXINIT) { |
32874aea |
3310 | bombout(("expected key exchange packet from server")); |
3311 | crReturn(0); |
7cca0d81 |
3312 | } |
32874aea |
3313 | kex = NULL; |
3314 | hostkey = NULL; |
3315 | cscipher_tobe = NULL; |
3316 | sccipher_tobe = NULL; |
3317 | csmac_tobe = NULL; |
3318 | scmac_tobe = NULL; |
3319 | cscomp_tobe = NULL; |
3320 | sccomp_tobe = NULL; |
3321 | pktin.savedpos += 16; /* skip garbage cookie */ |
e5574168 |
3322 | ssh2_pkt_getstring(&str, &len); /* key exchange algorithms */ |
3323 | for (i = 0; i < lenof(kex_algs); i++) { |
32874aea |
3324 | if (in_commasep_string(kex_algs[i]->name, str, len)) { |
3325 | kex = kex_algs[i]; |
3326 | break; |
3327 | } |
e5574168 |
3328 | } |
3329 | ssh2_pkt_getstring(&str, &len); /* host key algorithms */ |
3330 | for (i = 0; i < lenof(hostkey_algs); i++) { |
32874aea |
3331 | if (in_commasep_string(hostkey_algs[i]->name, str, len)) { |
3332 | hostkey = hostkey_algs[i]; |
3333 | break; |
3334 | } |
e5574168 |
3335 | } |
3336 | ssh2_pkt_getstring(&str, &len); /* client->server cipher */ |
ca20bfcf |
3337 | warn = 0; |
3338 | for (i = 0; i < n_preferred_ciphers; i++) { |
3339 | const struct ssh2_ciphers *c = preferred_ciphers[i]; |
3340 | if (!c) { |
3341 | warn = 1; |
3342 | } else { |
3343 | for (j = 0; j < c->nciphers; j++) { |
3344 | if (in_commasep_string(c->list[j]->name, str, len)) { |
3345 | cscipher_tobe = c->list[j]; |
3346 | break; |
3347 | } |
32874aea |
3348 | } |
3349 | } |
ca20bfcf |
3350 | if (cscipher_tobe) { |
3351 | if (warn) |
3352 | askcipher(cscipher_tobe->name, 1); |
32874aea |
3353 | break; |
ca20bfcf |
3354 | } |
e5574168 |
3355 | } |
3356 | ssh2_pkt_getstring(&str, &len); /* server->client cipher */ |
ca20bfcf |
3357 | warn = 0; |
3358 | for (i = 0; i < n_preferred_ciphers; i++) { |
3359 | const struct ssh2_ciphers *c = preferred_ciphers[i]; |
3360 | if (!c) { |
3361 | warn = 1; |
3362 | } else { |
3363 | for (j = 0; j < c->nciphers; j++) { |
3364 | if (in_commasep_string(c->list[j]->name, str, len)) { |
3365 | sccipher_tobe = c->list[j]; |
3366 | break; |
3367 | } |
32874aea |
3368 | } |
3369 | } |
ca20bfcf |
3370 | if (sccipher_tobe) { |
3371 | if (warn) |
3372 | askcipher(sccipher_tobe->name, 2); |
32874aea |
3373 | break; |
ca20bfcf |
3374 | } |
e5574168 |
3375 | } |
3376 | ssh2_pkt_getstring(&str, &len); /* client->server mac */ |
8b2715b2 |
3377 | for (i = 0; i < nmacs; i++) { |
32874aea |
3378 | if (in_commasep_string(maclist[i]->name, str, len)) { |
3379 | csmac_tobe = maclist[i]; |
3380 | break; |
3381 | } |
e5574168 |
3382 | } |
3383 | ssh2_pkt_getstring(&str, &len); /* server->client mac */ |
8b2715b2 |
3384 | for (i = 0; i < nmacs; i++) { |
32874aea |
3385 | if (in_commasep_string(maclist[i]->name, str, len)) { |
3386 | scmac_tobe = maclist[i]; |
3387 | break; |
3388 | } |
e5574168 |
3389 | } |
3390 | ssh2_pkt_getstring(&str, &len); /* client->server compression */ |
32874aea |
3391 | for (i = 0; i < lenof(compressions) + 1; i++) { |
3392 | const struct ssh_compress *c = |
3393 | i == 0 ? preferred_comp : compressions[i - 1]; |
3394 | if (in_commasep_string(c->name, str, len)) { |
3395 | cscomp_tobe = c; |
3396 | break; |
3397 | } |
e5574168 |
3398 | } |
3399 | ssh2_pkt_getstring(&str, &len); /* server->client compression */ |
32874aea |
3400 | for (i = 0; i < lenof(compressions) + 1; i++) { |
3401 | const struct ssh_compress *c = |
3402 | i == 0 ? preferred_comp : compressions[i - 1]; |
3403 | if (in_commasep_string(c->name, str, len)) { |
3404 | sccomp_tobe = c; |
3405 | break; |
3406 | } |
e5574168 |
3407 | } |
e5574168 |
3408 | |
3409 | /* |
7bd5a860 |
3410 | * Work out the number of bits of key we will need from the key |
3411 | * exchange. We start with the maximum key length of either |
3412 | * cipher... |
3413 | */ |
3414 | { |
32874aea |
3415 | int csbits, scbits; |
7bd5a860 |
3416 | |
3417 | csbits = cscipher_tobe->keylen; |
3418 | scbits = sccipher_tobe->keylen; |
3419 | nbits = (csbits > scbits ? csbits : scbits); |
3420 | } |
3421 | /* The keys only have 160-bit entropy, since they're based on |
3422 | * a SHA-1 hash. So cap the key size at 160 bits. */ |
32874aea |
3423 | if (nbits > 160) |
3424 | nbits = 160; |
7bd5a860 |
3425 | |
3426 | /* |
a92dd380 |
3427 | * If we're doing Diffie-Hellman group exchange, start by |
3428 | * requesting a group. |
e5574168 |
3429 | */ |
a92dd380 |
3430 | if (kex == &ssh_diffiehellman_gex) { |
32874aea |
3431 | logevent("Doing Diffie-Hellman group exchange"); |
3432 | /* |
3433 | * Work out how big a DH group we will need to allow that |
3434 | * much data. |
7bd5a860 |
3435 | */ |
32874aea |
3436 | pbits = 512 << ((nbits - 1) / 64); |
3437 | ssh2_pkt_init(SSH2_MSG_KEX_DH_GEX_REQUEST); |
3438 | ssh2_pkt_adduint32(pbits); |
3439 | ssh2_pkt_send(); |
3440 | |
3441 | crWaitUntil(ispkt); |
3442 | if (pktin.type != SSH2_MSG_KEX_DH_GEX_GROUP) { |
3443 | bombout(("expected key exchange group packet from server")); |
3444 | crReturn(0); |
3445 | } |
3446 | p = ssh2_pkt_getmp(); |
3447 | g = ssh2_pkt_getmp(); |
3448 | dh_setup_group(p, g); |
3449 | kex_init_value = SSH2_MSG_KEX_DH_GEX_INIT; |
3450 | kex_reply_value = SSH2_MSG_KEX_DH_GEX_REPLY; |
a92dd380 |
3451 | } else { |
32874aea |
3452 | dh_setup_group1(); |
3453 | kex_init_value = SSH2_MSG_KEXDH_INIT; |
3454 | kex_reply_value = SSH2_MSG_KEXDH_REPLY; |
8d5de777 |
3455 | } |
e5574168 |
3456 | |
a92dd380 |
3457 | logevent("Doing Diffie-Hellman key exchange"); |
e5574168 |
3458 | /* |
a92dd380 |
3459 | * Now generate and send e for Diffie-Hellman. |
e5574168 |
3460 | */ |
32874aea |
3461 | e = dh_create_e(nbits * 2); |
a92dd380 |
3462 | ssh2_pkt_init(kex_init_value); |
e5574168 |
3463 | ssh2_pkt_addmp(e); |
3464 | ssh2_pkt_send(); |
3465 | |
3466 | crWaitUntil(ispkt); |
a92dd380 |
3467 | if (pktin.type != kex_reply_value) { |
32874aea |
3468 | bombout(("expected key exchange reply packet from server")); |
3469 | crReturn(0); |
7cca0d81 |
3470 | } |
e5574168 |
3471 | ssh2_pkt_getstring(&hostkeydata, &hostkeylen); |
3472 | f = ssh2_pkt_getmp(); |
e5574168 |
3473 | ssh2_pkt_getstring(&sigdata, &siglen); |
3474 | |
3475 | K = dh_find_K(f); |
e5574168 |
3476 | |
3477 | sha_string(&exhash, hostkeydata, hostkeylen); |
a92dd380 |
3478 | if (kex == &ssh_diffiehellman_gex) { |
32874aea |
3479 | sha_uint32(&exhash, pbits); |
3480 | sha_mpint(&exhash, p); |
3481 | sha_mpint(&exhash, g); |
a92dd380 |
3482 | } |
e5574168 |
3483 | sha_mpint(&exhash, e); |
3484 | sha_mpint(&exhash, f); |
3485 | sha_mpint(&exhash, K); |
3486 | SHA_Final(&exhash, exchange_hash); |
3487 | |
3709bfe9 |
3488 | dh_cleanup(); |
3489 | |
7cca0d81 |
3490 | #if 0 |
765c4200 |
3491 | debug(("Exchange hash is:\n")); |
3492 | dmemdump(exchange_hash, 20); |
7cca0d81 |
3493 | #endif |
3494 | |
e055a386 |
3495 | hkey = hostkey->newkey(hostkeydata, hostkeylen); |
f7259d10 |
3496 | if (!hkey || |
3497 | !hostkey->verifysig(hkey, sigdata, siglen, exchange_hash, 20)) { |
3498 | bombout(("Server's host key did not match the signature supplied")); |
32874aea |
3499 | crReturn(0); |
8d5de777 |
3500 | } |
e5574168 |
3501 | |
3502 | /* |
7cca0d81 |
3503 | * Authenticate remote host: verify host key. (We've already |
3504 | * checked the signature of the exchange hash.) |
e5574168 |
3505 | */ |
e055a386 |
3506 | keystr = hostkey->fmtkey(hkey); |
3507 | fingerprint = hostkey->fingerprint(hkey); |
d4857987 |
3508 | verify_ssh_host_key(savedhost, savedport, hostkey->keytype, |
32874aea |
3509 | keystr, fingerprint); |
3510 | if (first_kex) { /* don't bother logging this in rekeys */ |
5e0d7cb8 |
3511 | logevent("Host key fingerprint is:"); |
3512 | logevent(fingerprint); |
3513 | } |
dcbde236 |
3514 | sfree(fingerprint); |
3515 | sfree(keystr); |
e055a386 |
3516 | hostkey->freekey(hkey); |
d39f364a |
3517 | |
3518 | /* |
7cca0d81 |
3519 | * Send SSH2_MSG_NEWKEYS. |
d39f364a |
3520 | */ |
3521 | ssh2_pkt_init(SSH2_MSG_NEWKEYS); |
3522 | ssh2_pkt_send(); |
d39f364a |
3523 | |
3524 | /* |
8406eaf9 |
3525 | * Expect SSH2_MSG_NEWKEYS from server. |
3526 | */ |
3527 | crWaitUntil(ispkt); |
3528 | if (pktin.type != SSH2_MSG_NEWKEYS) { |
3529 | bombout(("expected new-keys packet from server")); |
3530 | crReturn(0); |
3531 | } |
3532 | |
3533 | /* |
d39f364a |
3534 | * Create and initialise session keys. |
3535 | */ |
3536 | cscipher = cscipher_tobe; |
3537 | sccipher = sccipher_tobe; |
3538 | csmac = csmac_tobe; |
3539 | scmac = scmac_tobe; |
3540 | cscomp = cscomp_tobe; |
3541 | sccomp = sccomp_tobe; |
4ba9b64b |
3542 | cscomp->compress_init(); |
3543 | sccomp->decompress_init(); |
d39f364a |
3544 | /* |
5e0d7cb8 |
3545 | * Set IVs after keys. Here we use the exchange hash from the |
3546 | * _first_ key exchange. |
d39f364a |
3547 | */ |
5e0d7cb8 |
3548 | if (first_kex) |
65a22376 |
3549 | memcpy(ssh2_session_id, exchange_hash, sizeof(exchange_hash)); |
3550 | ssh2_mkkey(K, exchange_hash, ssh2_session_id, 'C', keyspace); |
5e0d7cb8 |
3551 | cscipher->setcskey(keyspace); |
65a22376 |
3552 | ssh2_mkkey(K, exchange_hash, ssh2_session_id, 'D', keyspace); |
5e0d7cb8 |
3553 | sccipher->setsckey(keyspace); |
65a22376 |
3554 | ssh2_mkkey(K, exchange_hash, ssh2_session_id, 'A', keyspace); |
5e0d7cb8 |
3555 | cscipher->setcsiv(keyspace); |
65a22376 |
3556 | ssh2_mkkey(K, exchange_hash, ssh2_session_id, 'B', keyspace); |
5e0d7cb8 |
3557 | sccipher->setsciv(keyspace); |
65a22376 |
3558 | ssh2_mkkey(K, exchange_hash, ssh2_session_id, 'E', keyspace); |
5e0d7cb8 |
3559 | csmac->setcskey(keyspace); |
65a22376 |
3560 | ssh2_mkkey(K, exchange_hash, ssh2_session_id, 'F', keyspace); |
5e0d7cb8 |
3561 | scmac->setsckey(keyspace); |
d39f364a |
3562 | |
033b4cef |
3563 | /* |
0db56f73 |
3564 | * If this is the first key exchange phase, we must pass the |
3565 | * SSH2_MSG_NEWKEYS packet to the next layer, not because it |
3566 | * wants to see it but because it will need time to initialise |
3567 | * itself before it sees an actual packet. In subsequent key |
3568 | * exchange phases, we don't pass SSH2_MSG_NEWKEYS on, because |
3569 | * it would only confuse the layer above. |
3570 | */ |
3571 | if (!first_kex) { |
32874aea |
3572 | crReturn(0); |
0db56f73 |
3573 | } |
3574 | first_kex = 0; |
3575 | |
3576 | /* |
7cca0d81 |
3577 | * Now we're encrypting. Begin returning 1 to the protocol main |
3578 | * function so that other things can run on top of the |
3579 | * transport. If we ever see a KEXINIT, we must go back to the |
3580 | * start. |
033b4cef |
3581 | */ |
e96adf72 |
3582 | while (!(ispkt && pktin.type == SSH2_MSG_KEXINIT)) { |
32874aea |
3583 | crReturn(1); |
e96adf72 |
3584 | } |
5e0d7cb8 |
3585 | logevent("Server initiated key re-exchange"); |
7cca0d81 |
3586 | goto begin_key_exchange; |
e5574168 |
3587 | |
3588 | crFinish(1); |
3589 | } |
3590 | |
7cca0d81 |
3591 | /* |
783415f8 |
3592 | * Add data to an SSH2 channel output buffer. |
3593 | */ |
32874aea |
3594 | static void ssh2_add_channel_data(struct ssh_channel *c, char *buf, |
3595 | int len) |
3596 | { |
5471d09a |
3597 | bufchain_add(&c->v.v2.outbuffer, buf, len); |
783415f8 |
3598 | } |
3599 | |
3600 | /* |
3601 | * Attempt to send data on an SSH2 channel. |
3602 | */ |
5471d09a |
3603 | static int ssh2_try_send(struct ssh_channel *c) |
32874aea |
3604 | { |
5471d09a |
3605 | while (c->v.v2.remwindow > 0 && bufchain_size(&c->v.v2.outbuffer) > 0) { |
3606 | int len; |
3607 | void *data; |
3608 | bufchain_prefix(&c->v.v2.outbuffer, &data, &len); |
3609 | if ((unsigned)len > c->v.v2.remwindow) |
3610 | len = c->v.v2.remwindow; |
3611 | if ((unsigned)len > c->v.v2.remmaxpkt) |
3612 | len = c->v.v2.remmaxpkt; |
32874aea |
3613 | ssh2_pkt_init(SSH2_MSG_CHANNEL_DATA); |
3614 | ssh2_pkt_adduint32(c->remoteid); |
3615 | ssh2_pkt_addstring_start(); |
5471d09a |
3616 | ssh2_pkt_addstring_data(data, len); |
32874aea |
3617 | ssh2_pkt_send(); |
5471d09a |
3618 | bufchain_consume(&c->v.v2.outbuffer, len); |
3619 | c->v.v2.remwindow -= len; |
3620 | } |
3621 | |
3622 | /* |
3623 | * After having sent as much data as we can, return the amount |
3624 | * still buffered. |
3625 | */ |
3626 | return bufchain_size(&c->v.v2.outbuffer); |
3627 | } |
3628 | |
3629 | /* |
3630 | * Potentially enlarge the window on an SSH2 channel. |
3631 | */ |
3632 | static void ssh2_set_window(struct ssh_channel *c, unsigned newwin) |
3633 | { |
3634 | if (newwin > c->v.v2.locwindow) { |
3635 | ssh2_pkt_init(SSH2_MSG_CHANNEL_WINDOW_ADJUST); |
3636 | ssh2_pkt_adduint32(c->remoteid); |
3637 | ssh2_pkt_adduint32(newwin - c->v.v2.locwindow); |
3638 | ssh2_pkt_send(); |
3639 | c->v.v2.locwindow = newwin; |
783415f8 |
3640 | } |
3641 | } |
3642 | |
3643 | /* |
7cca0d81 |
3644 | * Handle the SSH2 userauth and connection layers. |
3645 | */ |
3646 | static void do_ssh2_authconn(unsigned char *in, int inlen, int ispkt) |
3647 | { |
65a22376 |
3648 | static enum { |
32874aea |
3649 | AUTH_INVALID, AUTH_PUBLICKEY_AGENT, AUTH_PUBLICKEY_FILE, |
761187b6 |
3650 | AUTH_PASSWORD, |
3651 | AUTH_KEYBOARD_INTERACTIVE |
65a22376 |
3652 | } method; |
1408a877 |
3653 | static enum { |
32874aea |
3654 | AUTH_TYPE_NONE, |
3655 | AUTH_TYPE_PUBLICKEY, |
3656 | AUTH_TYPE_PUBLICKEY_OFFER_LOUD, |
3657 | AUTH_TYPE_PUBLICKEY_OFFER_QUIET, |
761187b6 |
3658 | AUTH_TYPE_PASSWORD, |
4bdf7c46 |
3659 | AUTH_TYPE_KEYBOARD_INTERACTIVE, |
3660 | AUTH_TYPE_KEYBOARD_INTERACTIVE_QUIET |
1408a877 |
3661 | } type; |
761187b6 |
3662 | static int gotit, need_pw, can_pubkey, can_passwd, can_keyb_inter; |
3663 | static int tried_pubkey_config, tried_agent, tried_keyb_inter; |
b3186d64 |
3664 | static int kbd_inter_running; |
1408a877 |
3665 | static int we_are_in; |
761187b6 |
3666 | static int num_prompts, echo; |
65a22376 |
3667 | static char username[100]; |
3668 | static char pwprompt[200]; |
3669 | static char password[100]; |
7cca0d81 |
3670 | |
e5574168 |
3671 | crBegin; |
3672 | |
7cca0d81 |
3673 | /* |
3674 | * Request userauth protocol, and await a response to it. |
3675 | */ |
3676 | ssh2_pkt_init(SSH2_MSG_SERVICE_REQUEST); |
3677 | ssh2_pkt_addstring("ssh-userauth"); |
3678 | ssh2_pkt_send(); |
3679 | crWaitUntilV(ispkt); |
8d5de777 |
3680 | if (pktin.type != SSH2_MSG_SERVICE_ACCEPT) { |
32874aea |
3681 | bombout(("Server refused user authentication protocol")); |
3682 | crReturnV; |
8d5de777 |
3683 | } |
7cca0d81 |
3684 | |
3685 | /* |
1408a877 |
3686 | * We repeat this whole loop, including the username prompt, |
3687 | * until we manage a successful authentication. If the user |
3688 | * types the wrong _password_, they are sent back to the |
3689 | * beginning to try another username. (If they specify a |
3690 | * username in the config, they are never asked, even if they |
3691 | * do give a wrong password.) |
3692 | * |
3693 | * I think this best serves the needs of |
3694 | * |
3695 | * - the people who have no configuration, no keys, and just |
3696 | * want to try repeated (username,password) pairs until they |
3697 | * type both correctly |
3698 | * |
3699 | * - people who have keys and configuration but occasionally |
3700 | * need to fall back to passwords |
3701 | * |
3702 | * - people with a key held in Pageant, who might not have |
3703 | * logged in to a particular machine before; so they want to |
3704 | * type a username, and then _either_ their key will be |
3705 | * accepted, _or_ they will type a password. If they mistype |
3706 | * the username they will want to be able to get back and |
3707 | * retype it! |
7cca0d81 |
3708 | */ |
1408a877 |
3709 | do { |
3710 | static int pos; |
7cca0d81 |
3711 | static char c; |
e5574168 |
3712 | |
1408a877 |
3713 | /* |
3714 | * Get a username. |
3715 | */ |
3716 | pos = 0; |
67779be7 |
3717 | if ((flags & FLAG_INTERACTIVE) && !*cfg.username) { |
32874aea |
3718 | if (ssh_get_line) { |
3719 | if (!ssh_get_line("login as: ", |
3720 | username, sizeof(username), FALSE)) { |
3721 | /* |
3722 | * get_line failed to get a username. |
3723 | * Terminate. |
3724 | */ |
3725 | logevent("No username provided. Abandoning session."); |
3726 | ssh_state = SSH_STATE_CLOSED; |
3727 | crReturnV; |
3728 | } |
3729 | } else { |
3730 | c_write_str("login as: "); |
3731 | ssh_send_ok = 1; |
3732 | while (pos >= 0) { |
3733 | crWaitUntilV(!ispkt); |
3734 | while (inlen--) |
3735 | switch (c = *in++) { |
3736 | case 10: |
3737 | case 13: |
3738 | username[pos] = 0; |
3739 | pos = -1; |
3740 | break; |
3741 | case 8: |
3742 | case 127: |
3743 | if (pos > 0) { |
3744 | c_write_str("\b \b"); |
3745 | pos--; |
3746 | } |
3747 | break; |
3748 | case 21: |
3749 | case 27: |
3750 | while (pos > 0) { |
3751 | c_write_str("\b \b"); |
3752 | pos--; |
3753 | } |
3754 | break; |
3755 | case 3: |
3756 | case 4: |
3757 | random_save_seed(); |
3758 | exit(0); |
3759 | break; |
3760 | default: |
3761 | if (((c >= ' ' && c <= '~') || |
51b2fb65 |
3762 | ((unsigned char) c >= 160)) |
3763 | && pos < sizeof(username)-1) { |
32874aea |
3764 | username[pos++] = c; |
3765 | c_write(&c, 1); |
3766 | } |
3767 | break; |
3768 | } |
3769 | } |
3770 | } |
1408a877 |
3771 | c_write_str("\r\n"); |
7cca0d81 |
3772 | username[strcspn(username, "\n\r")] = '\0'; |
3773 | } else { |
3774 | char stuff[200]; |
3775 | strncpy(username, cfg.username, 99); |
3776 | username[99] = '\0'; |
65a22376 |
3777 | if ((flags & FLAG_VERBOSE) || (flags & FLAG_INTERACTIVE)) { |
7cca0d81 |
3778 | sprintf(stuff, "Using username \"%s\".\r\n", username); |
1408a877 |
3779 | c_write_str(stuff); |
7cca0d81 |
3780 | } |
3781 | } |
3782 | |
65a22376 |
3783 | /* |
1408a877 |
3784 | * Send an authentication request using method "none": (a) |
3785 | * just in case it succeeds, and (b) so that we know what |
3786 | * authentication methods we can usefully try next. |
65a22376 |
3787 | */ |
1408a877 |
3788 | ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST); |
3789 | ssh2_pkt_addstring(username); |
32874aea |
3790 | ssh2_pkt_addstring("ssh-connection"); /* service requested */ |
1408a877 |
3791 | ssh2_pkt_addstring("none"); /* method */ |
3792 | ssh2_pkt_send(); |
3793 | type = AUTH_TYPE_NONE; |
3794 | gotit = FALSE; |
3795 | we_are_in = FALSE; |
7cca0d81 |
3796 | |
1408a877 |
3797 | tried_pubkey_config = FALSE; |
1983e559 |
3798 | tried_agent = FALSE; |
b3186d64 |
3799 | tried_keyb_inter = FALSE; |
3800 | kbd_inter_running = FALSE; |
65a22376 |
3801 | |
1408a877 |
3802 | while (1) { |
3803 | /* |
3804 | * Wait for the result of the last authentication request. |
3805 | */ |
3806 | if (!gotit) |
3807 | crWaitUntilV(ispkt); |
3808 | while (pktin.type == SSH2_MSG_USERAUTH_BANNER) { |
32874aea |
3809 | char *banner; |
3810 | int size; |
3811 | /* |
3812 | * Don't show the banner if we're operating in |
3813 | * non-verbose non-interactive mode. (It's probably |
3814 | * a script, which means nobody will read the |
3815 | * banner _anyway_, and moreover the printing of |
3816 | * the banner will screw up processing on the |
3817 | * output of (say) plink.) |
3818 | */ |
3819 | if (flags & (FLAG_VERBOSE | FLAG_INTERACTIVE)) { |
3820 | ssh2_pkt_getstring(&banner, &size); |
3821 | if (banner) |
3822 | c_write_untrusted(banner, size); |
3823 | } |
1408a877 |
3824 | crWaitUntilV(ispkt); |
3825 | } |
3826 | if (pktin.type == SSH2_MSG_USERAUTH_SUCCESS) { |
3827 | logevent("Access granted"); |
3828 | we_are_in = TRUE; |
3829 | break; |
3830 | } |
65a22376 |
3831 | |
b3186d64 |
3832 | if (kbd_inter_running && |
3833 | pktin.type == SSH2_MSG_USERAUTH_INFO_REQUEST) { |
3834 | /* |
3835 | * This is a further prompt in keyboard-interactive |
3836 | * authentication. Do nothing. |
3837 | */ |
6bb26b30 |
3838 | } else if (pktin.type != SSH2_MSG_USERAUTH_FAILURE) { |
b3186d64 |
3839 | bombout(("Strange packet received during authentication: type %d", |
1408a877 |
3840 | pktin.type)); |
38c4a8da |
3841 | crReturnV; |
65a22376 |
3842 | } |
3843 | |
1408a877 |
3844 | gotit = FALSE; |
65a22376 |
3845 | |
1408a877 |
3846 | /* |
3847 | * OK, we're now sitting on a USERAUTH_FAILURE message, so |
3848 | * we can look at the string in it and know what we can |
3849 | * helpfully try next. |
3850 | */ |
b3186d64 |
3851 | if (pktin.type == SSH2_MSG_USERAUTH_FAILURE) { |
1408a877 |
3852 | char *methods; |
3853 | int methlen; |
3854 | ssh2_pkt_getstring(&methods, &methlen); |
b3186d64 |
3855 | kbd_inter_running = FALSE; |
1408a877 |
3856 | if (!ssh2_pkt_getbool()) { |
3857 | /* |
3858 | * We have received an unequivocal Access |
3859 | * Denied. This can translate to a variety of |
3860 | * messages: |
3861 | * |
3862 | * - if we'd just tried "none" authentication, |
3863 | * it's not worth printing anything at all |
3864 | * |
3865 | * - if we'd just tried a public key _offer_, |
3866 | * the message should be "Server refused our |
3867 | * key" (or no message at all if the key |
3868 | * came from Pageant) |
3869 | * |
3870 | * - if we'd just tried anything else, the |
3871 | * message really should be "Access denied". |
3872 | * |
3873 | * Additionally, if we'd just tried password |
3874 | * authentication, we should break out of this |
3875 | * whole loop so as to go back to the username |
3876 | * prompt. |
3877 | */ |
3878 | if (type == AUTH_TYPE_NONE) { |
3879 | /* do nothing */ |
3880 | } else if (type == AUTH_TYPE_PUBLICKEY_OFFER_LOUD || |
3881 | type == AUTH_TYPE_PUBLICKEY_OFFER_QUIET) { |
3882 | if (type == AUTH_TYPE_PUBLICKEY_OFFER_LOUD) |
3883 | c_write_str("Server refused our key\r\n"); |
3884 | logevent("Server refused public key"); |
4bdf7c46 |
3885 | } else if (type == AUTH_TYPE_KEYBOARD_INTERACTIVE_QUIET) { |
3886 | /* server declined keyboard-interactive; ignore */ |
1408a877 |
3887 | } else { |
3888 | c_write_str("Access denied\r\n"); |
3889 | logevent("Access denied"); |
3890 | if (type == AUTH_TYPE_PASSWORD) { |
3891 | we_are_in = FALSE; |
3892 | break; |
3893 | } |
3894 | } |
3895 | } else { |
3896 | c_write_str("Further authentication required\r\n"); |
3897 | logevent("Further authentication required"); |
3898 | } |
65a22376 |
3899 | |
32874aea |
3900 | can_pubkey = |
3901 | in_commasep_string("publickey", methods, methlen); |
3902 | can_passwd = |
3903 | in_commasep_string("password", methods, methlen); |
761187b6 |
3904 | can_keyb_inter = |
3905 | in_commasep_string("keyboard-interactive", methods, methlen); |
1408a877 |
3906 | } |
65a22376 |
3907 | |
1408a877 |
3908 | method = 0; |
65a22376 |
3909 | |
78afa559 |
3910 | if (!method && can_pubkey && agent_exists() && !tried_agent) { |
1983e559 |
3911 | /* |
3912 | * Attempt public-key authentication using Pageant. |
3913 | */ |
3914 | static unsigned char request[5], *response, *p; |
3915 | static int responselen; |
3916 | static int i, nkeys; |
3917 | static int authed = FALSE; |
3918 | void *r; |
3919 | |
3920 | tried_agent = TRUE; |
3921 | |
3922 | logevent("Pageant is running. Requesting keys."); |
3923 | |
3924 | /* Request the keys held by the agent. */ |
3925 | PUT_32BIT(request, 1); |
3926 | request[4] = SSH2_AGENTC_REQUEST_IDENTITIES; |
3927 | agent_query(request, 5, &r, &responselen); |
32874aea |
3928 | response = (unsigned char *) r; |
95797139 |
3929 | if (response && responselen >= 5 && |
32874aea |
3930 | response[4] == SSH2_AGENT_IDENTITIES_ANSWER) { |
1983e559 |
3931 | p = response + 5; |
32874aea |
3932 | nkeys = GET_32BIT(p); |
3933 | p += 4; |
3934 | { |
3935 | char buf[64]; |
3936 | sprintf(buf, "Pageant has %d SSH2 keys", nkeys); |
3937 | logevent(buf); |
3938 | } |
1983e559 |
3939 | for (i = 0; i < nkeys; i++) { |
3940 | static char *pkblob, *alg, *commentp; |
3941 | static int pklen, alglen, commentlen; |
3942 | static int siglen, retlen, len; |
3943 | static char *q, *agentreq, *ret; |
2d466ffd |
3944 | void *vret; |
1983e559 |
3945 | |
32874aea |
3946 | { |
3947 | char buf[64]; |
3948 | sprintf(buf, "Trying Pageant key #%d", i); |
3949 | logevent(buf); |
3950 | } |
3951 | pklen = GET_32BIT(p); |
3952 | p += 4; |
3953 | pkblob = p; |
3954 | p += pklen; |
1983e559 |
3955 | alglen = GET_32BIT(pkblob); |
3956 | alg = pkblob + 4; |
32874aea |
3957 | commentlen = GET_32BIT(p); |
3958 | p += 4; |
3959 | commentp = p; |
3960 | p += commentlen; |
1983e559 |
3961 | ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST); |
3962 | ssh2_pkt_addstring(username); |
32874aea |
3963 | ssh2_pkt_addstring("ssh-connection"); /* service requested */ |
3964 | ssh2_pkt_addstring("publickey"); /* method */ |
3965 | ssh2_pkt_addbool(FALSE); /* no signature included */ |
1983e559 |
3966 | ssh2_pkt_addstring_start(); |
3967 | ssh2_pkt_addstring_data(alg, alglen); |
3968 | ssh2_pkt_addstring_start(); |
3969 | ssh2_pkt_addstring_data(pkblob, pklen); |
3970 | ssh2_pkt_send(); |
3971 | |
3972 | crWaitUntilV(ispkt); |
3973 | if (pktin.type != SSH2_MSG_USERAUTH_PK_OK) { |
3974 | logevent("Key refused"); |
3975 | continue; |
3976 | } |
3977 | |
32874aea |
3978 | if (flags & FLAG_VERBOSE) { |
3979 | c_write_str |
3980 | ("Authenticating with public key \""); |
3981 | c_write(commentp, commentlen); |
3982 | c_write_str("\" from agent\r\n"); |
3983 | } |
1983e559 |
3984 | |
3985 | /* |
3986 | * Server is willing to accept the key. |
3987 | * Construct a SIGN_REQUEST. |
3988 | */ |
3989 | ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST); |
3990 | ssh2_pkt_addstring(username); |
32874aea |
3991 | ssh2_pkt_addstring("ssh-connection"); /* service requested */ |
3992 | ssh2_pkt_addstring("publickey"); /* method */ |
1983e559 |
3993 | ssh2_pkt_addbool(TRUE); |
3994 | ssh2_pkt_addstring_start(); |
3995 | ssh2_pkt_addstring_data(alg, alglen); |
3996 | ssh2_pkt_addstring_start(); |
3997 | ssh2_pkt_addstring_data(pkblob, pklen); |
3998 | |
3999 | siglen = pktout.length - 5 + 4 + 20; |
32874aea |
4000 | len = 1; /* message type */ |
4001 | len += 4 + pklen; /* key blob */ |
4002 | len += 4 + siglen; /* data to sign */ |
4003 | len += 4; /* flags */ |
1983e559 |
4004 | agentreq = smalloc(4 + len); |
4005 | PUT_32BIT(agentreq, len); |
4006 | q = agentreq + 4; |
4007 | *q++ = SSH2_AGENTC_SIGN_REQUEST; |
32874aea |
4008 | PUT_32BIT(q, pklen); |
4009 | q += 4; |
4010 | memcpy(q, pkblob, pklen); |
4011 | q += pklen; |
4012 | PUT_32BIT(q, siglen); |
4013 | q += 4; |
1983e559 |
4014 | /* Now the data to be signed... */ |
32874aea |
4015 | PUT_32BIT(q, 20); |
4016 | q += 4; |
4017 | memcpy(q, ssh2_session_id, 20); |
4018 | q += 20; |
4019 | memcpy(q, pktout.data + 5, pktout.length - 5); |
4020 | q += pktout.length - 5; |
1983e559 |
4021 | /* And finally the (zero) flags word. */ |
4022 | PUT_32BIT(q, 0); |
2d466ffd |
4023 | agent_query(agentreq, len + 4, &vret, &retlen); |
4024 | ret = vret; |
1983e559 |
4025 | sfree(agentreq); |
4026 | if (ret) { |
4027 | if (ret[4] == SSH2_AGENT_SIGN_RESPONSE) { |
4028 | logevent("Sending Pageant's response"); |
4029 | ssh2_pkt_addstring_start(); |
32874aea |
4030 | ssh2_pkt_addstring_data(ret + 9, |
4031 | GET_32BIT(ret + |
4032 | 5)); |
1983e559 |
4033 | ssh2_pkt_send(); |
4034 | authed = TRUE; |
4035 | break; |
4036 | } else { |
32874aea |
4037 | logevent |
4038 | ("Pageant failed to answer challenge"); |
1983e559 |
4039 | sfree(ret); |
4040 | } |
4041 | } |
4042 | } |
4043 | if (authed) |
4044 | continue; |
4045 | } |
4046 | } |
4047 | |
32874aea |
4048 | if (!method && can_pubkey && *cfg.keyfile |
4049 | && !tried_pubkey_config) { |
1408a877 |
4050 | unsigned char *pub_blob; |
4051 | char *algorithm, *comment; |
4052 | int pub_blob_len; |
65a22376 |
4053 | |
1408a877 |
4054 | tried_pubkey_config = TRUE; |
65a22376 |
4055 | |
65a22376 |
4056 | /* |
1408a877 |
4057 | * Try the public key supplied in the configuration. |
4058 | * |
4059 | * First, offer the public blob to see if the server is |
4060 | * willing to accept it. |
65a22376 |
4061 | */ |
1408a877 |
4062 | pub_blob = ssh2_userkey_loadpub(cfg.keyfile, &algorithm, |
4063 | &pub_blob_len); |
4064 | if (pub_blob) { |
4065 | ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST); |
4066 | ssh2_pkt_addstring(username); |
32874aea |
4067 | ssh2_pkt_addstring("ssh-connection"); /* service requested */ |
4068 | ssh2_pkt_addstring("publickey"); /* method */ |
4069 | ssh2_pkt_addbool(FALSE); /* no signature included */ |
1408a877 |
4070 | ssh2_pkt_addstring(algorithm); |
4071 | ssh2_pkt_addstring_start(); |
4072 | ssh2_pkt_addstring_data(pub_blob, pub_blob_len); |
4073 | ssh2_pkt_send(); |
32874aea |
4074 | logevent("Offered public key"); /* FIXME */ |
1408a877 |
4075 | |
4076 | crWaitUntilV(ispkt); |
4077 | if (pktin.type != SSH2_MSG_USERAUTH_PK_OK) { |
4078 | gotit = TRUE; |
4079 | type = AUTH_TYPE_PUBLICKEY_OFFER_LOUD; |
32874aea |
4080 | continue; /* key refused; give up on it */ |
1408a877 |
4081 | } |
65a22376 |
4082 | |
1408a877 |
4083 | logevent("Offer of public key accepted"); |
65a22376 |
4084 | /* |
1408a877 |
4085 | * Actually attempt a serious authentication using |
4086 | * the key. |
65a22376 |
4087 | */ |
1408a877 |
4088 | if (ssh2_userkey_encrypted(cfg.keyfile, &comment)) { |
32874aea |
4089 | sprintf(pwprompt, |
4090 | "Passphrase for key \"%.100s\": ", |
4091 | comment); |
1408a877 |
4092 | need_pw = TRUE; |
4093 | } else { |
4094 | need_pw = FALSE; |
4095 | } |
4096 | c_write_str("Authenticating with public key \""); |
4097 | c_write_str(comment); |
4098 | c_write_str("\"\r\n"); |
4099 | method = AUTH_PUBLICKEY_FILE; |
65a22376 |
4100 | } |
1408a877 |
4101 | } |
4102 | |
af659722 |
4103 | if (!method && can_keyb_inter && !tried_keyb_inter) { |
4104 | method = AUTH_KEYBOARD_INTERACTIVE; |
4105 | type = AUTH_TYPE_KEYBOARD_INTERACTIVE; |
4106 | tried_keyb_inter = TRUE; |
4107 | |
4108 | ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST); |
4109 | ssh2_pkt_addstring(username); |
4110 | ssh2_pkt_addstring("ssh-connection"); /* service requested */ |
4111 | ssh2_pkt_addstring("keyboard-interactive"); /* method */ |
4112 | ssh2_pkt_addstring(""); /* lang */ |
4113 | ssh2_pkt_addstring(""); |
4114 | ssh2_pkt_send(); |
4115 | |
4116 | crWaitUntilV(ispkt); |
4117 | if (pktin.type != SSH2_MSG_USERAUTH_INFO_REQUEST) { |
4118 | if (pktin.type == SSH2_MSG_USERAUTH_FAILURE) |
4119 | gotit = TRUE; |
4120 | logevent("Keyboard-interactive authentication refused"); |
4121 | type = AUTH_TYPE_KEYBOARD_INTERACTIVE_QUIET; |
4122 | continue; |
4123 | } |
4124 | |
4125 | kbd_inter_running = TRUE; |
4126 | } |
4127 | |
4128 | if (kbd_inter_running) { |
4129 | method = AUTH_KEYBOARD_INTERACTIVE; |
4130 | type = AUTH_TYPE_KEYBOARD_INTERACTIVE; |
4131 | tried_keyb_inter = TRUE; |
4132 | |
4133 | /* We've got packet with that "interactive" info |
4134 | dump banners, and set its prompt as ours */ |
4135 | { |
4136 | char *name, *inst, *lang, *prompt; |
4137 | int name_len, inst_len, lang_len, prompt_len; |
4138 | ssh2_pkt_getstring(&name, &name_len); |
4139 | ssh2_pkt_getstring(&inst, &inst_len); |
4140 | ssh2_pkt_getstring(&lang, &lang_len); |
4141 | if (name_len > 0) |
4142 | c_write_untrusted(name, name_len); |
4143 | if (inst_len > 0) |
4144 | c_write_untrusted(inst, inst_len); |
4145 | num_prompts = ssh2_pkt_getuint32(); |
4146 | |
4147 | ssh2_pkt_getstring(&prompt, &prompt_len); |
4148 | strncpy(pwprompt, prompt, sizeof(pwprompt)); |
4149 | need_pw = TRUE; |
4150 | |
4151 | echo = ssh2_pkt_getbool(); |
4152 | } |
4153 | } |
4154 | |
1408a877 |
4155 | if (!method && can_passwd) { |
4156 | method = AUTH_PASSWORD; |
32874aea |
4157 | sprintf(pwprompt, "%.90s@%.90s's password: ", username, |
4158 | savedhost); |
1408a877 |
4159 | need_pw = TRUE; |
4160 | } |
4161 | |
4162 | if (need_pw) { |
fa17a66e |
4163 | if (ssh_get_line) { |
4164 | if (!ssh_get_line(pwprompt, password, |
32874aea |
4165 | sizeof(password), TRUE)) { |
1408a877 |
4166 | /* |
fa17a66e |
4167 | * get_line failed to get a password (for |
4168 | * example because one was supplied on the |
4169 | * command line which has already failed to |
4170 | * work). Terminate. |
1408a877 |
4171 | */ |
2bc6a386 |
4172 | ssh2_pkt_init(SSH2_MSG_DISCONNECT); |
4173 | ssh2_pkt_adduint32(SSH2_DISCONNECT_BY_APPLICATION); |
4174 | ssh2_pkt_addstring |
4175 | ("No more passwords available to try"); |
4176 | ssh2_pkt_addstring("en"); /* language tag */ |
4177 | ssh2_pkt_send(); |
4178 | connection_fatal("Unable to authenticate"); |
1408a877 |
4179 | ssh_state = SSH_STATE_CLOSED; |
4180 | crReturnV; |
4181 | } |
4182 | } else { |
4183 | static int pos = 0; |
4184 | static char c; |
4185 | |
761187b6 |
4186 | c_write_untrusted(pwprompt, strlen(pwprompt)); |
1408a877 |
4187 | ssh_send_ok = 1; |
4188 | |
4189 | pos = 0; |
4190 | while (pos >= 0) { |
4191 | crWaitUntilV(!ispkt); |
32874aea |
4192 | while (inlen--) |
4193 | switch (c = *in++) { |
4194 | case 10: |
4195 | case 13: |
4196 | password[pos] = 0; |
4197 | pos = -1; |
4198 | break; |
4199 | case 8: |
4200 | case 127: |
4201 | if (pos > 0) |
4202 | pos--; |
4203 | break; |
4204 | case 21: |
4205 | case 27: |
4206 | pos = 0; |
4207 | break; |
4208 | case 3: |
4209 | case 4: |
4210 | random_save_seed(); |
4211 | exit(0); |
4212 | break; |
4213 | default: |
51b2fb65 |
4214 | if (pos < sizeof(password)-1) |
32874aea |
4215 | password[pos++] = c; |
4216 | break; |
4217 | } |
65a22376 |
4218 | } |
1408a877 |
4219 | c_write_str("\r\n"); |
65a22376 |
4220 | } |
65a22376 |
4221 | } |
65a22376 |
4222 | |
1408a877 |
4223 | if (method == AUTH_PUBLICKEY_FILE) { |
4224 | /* |
4225 | * We have our passphrase. Now try the actual authentication. |
4226 | */ |
4227 | struct ssh2_userkey *key; |
65a22376 |
4228 | |
1408a877 |
4229 | key = ssh2_load_userkey(cfg.keyfile, password); |
4230 | if (key == SSH2_WRONG_PASSPHRASE || key == NULL) { |
4231 | if (key == SSH2_WRONG_PASSPHRASE) { |
4232 | c_write_str("Wrong passphrase\r\n"); |
4233 | tried_pubkey_config = FALSE; |
4234 | } else { |
4235 | c_write_str("Unable to load private key\r\n"); |
4236 | tried_pubkey_config = TRUE; |
4237 | } |
4238 | /* Send a spurious AUTH_NONE to return to the top. */ |
4239 | ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST); |
4240 | ssh2_pkt_addstring(username); |
32874aea |
4241 | ssh2_pkt_addstring("ssh-connection"); /* service requested */ |
4242 | ssh2_pkt_addstring("none"); /* method */ |
1408a877 |
4243 | ssh2_pkt_send(); |
4244 | type = AUTH_TYPE_NONE; |
4245 | } else { |
4246 | unsigned char *blob, *sigdata; |
4247 | int blob_len, sigdata_len; |
65a22376 |
4248 | |
1408a877 |
4249 | /* |
4250 | * We have loaded the private key and the server |
4251 | * has announced that it's willing to accept it. |
4252 | * Hallelujah. Generate a signature and send it. |
4253 | */ |
4254 | ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST); |
4255 | ssh2_pkt_addstring(username); |
32874aea |
4256 | ssh2_pkt_addstring("ssh-connection"); /* service requested */ |
4257 | ssh2_pkt_addstring("publickey"); /* method */ |
1408a877 |
4258 | ssh2_pkt_addbool(TRUE); |
4259 | ssh2_pkt_addstring(key->alg->name); |
4260 | blob = key->alg->public_blob(key->data, &blob_len); |
4261 | ssh2_pkt_addstring_start(); |
4262 | ssh2_pkt_addstring_data(blob, blob_len); |
4263 | sfree(blob); |
4264 | |
4265 | /* |
4266 | * The data to be signed is: |
4267 | * |
4268 | * string session-id |
4269 | * |
4270 | * followed by everything so far placed in the |
4271 | * outgoing packet. |
4272 | */ |
4273 | sigdata_len = pktout.length - 5 + 4 + 20; |
4274 | sigdata = smalloc(sigdata_len); |
4275 | PUT_32BIT(sigdata, 20); |
32874aea |
4276 | memcpy(sigdata + 4, ssh2_session_id, 20); |
4277 | memcpy(sigdata + 24, pktout.data + 5, |
4278 | pktout.length - 5); |
4279 | blob = |
4280 | key->alg->sign(key->data, sigdata, sigdata_len, |
4281 | &blob_len); |
1408a877 |
4282 | ssh2_pkt_addstring_start(); |
4283 | ssh2_pkt_addstring_data(blob, blob_len); |
4284 | sfree(blob); |
4285 | sfree(sigdata); |
4286 | |
4287 | ssh2_pkt_send(); |
4288 | type = AUTH_TYPE_PUBLICKEY; |
4289 | } |
4290 | } else if (method == AUTH_PASSWORD) { |
65a22376 |
4291 | /* |
1408a877 |
4292 | * We send the password packet lumped tightly together with |
4293 | * an SSH_MSG_IGNORE packet. The IGNORE packet contains a |
4294 | * string long enough to make the total length of the two |
4295 | * packets constant. This should ensure that a passive |
4296 | * listener doing traffic analyis can't work out the length |
4297 | * of the password. |
4298 | * |
4299 | * For this to work, we need an assumption about the |
4300 | * maximum length of the password packet. I think 256 is |
4301 | * pretty conservative. Anyone using a password longer than |
4302 | * that probably doesn't have much to worry about from |
4303 | * people who find out how long their password is! |
65a22376 |
4304 | */ |
4305 | ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST); |
4306 | ssh2_pkt_addstring(username); |
32874aea |
4307 | ssh2_pkt_addstring("ssh-connection"); /* service requested */ |
1408a877 |
4308 | ssh2_pkt_addstring("password"); |
4309 | ssh2_pkt_addbool(FALSE); |
4310 | ssh2_pkt_addstring(password); |
4311 | ssh2_pkt_defer(); |
65a22376 |
4312 | /* |
1408a877 |
4313 | * We'll include a string that's an exact multiple of the |
4314 | * cipher block size. If the cipher is NULL for some |
4315 | * reason, we don't do this trick at all because we gain |
4316 | * nothing by it. |
65a22376 |
4317 | */ |
32874aea |
4318 | if (cscipher) { |
4319 | int stringlen, i; |
4320 | |
4321 | stringlen = (256 - deferred_len); |
4322 | stringlen += cscipher->blksize - 1; |
4323 | stringlen -= (stringlen % cscipher->blksize); |
4324 | if (cscomp) { |
4325 | /* |
4326 | * Temporarily disable actual compression, |
4327 | * so we can guarantee to get this string |
4328 | * exactly the length we want it. The |
4329 | * compression-disabling routine should |
4330 | * return an integer indicating how many |
4331 | * bytes we should adjust our string length |
4332 | * by. |
4333 | */ |
4334 | stringlen -= cscomp->disable_compression(); |
4335 | } |
1408a877 |
4336 | ssh2_pkt_init(SSH2_MSG_IGNORE); |
4337 | ssh2_pkt_addstring_start(); |
6e9e9520 |
4338 | for (i = 0; i < stringlen; i++) { |
32874aea |
4339 | char c = (char) random_byte(); |
4340 | ssh2_pkt_addstring_data(&c, 1); |
65a22376 |
4341 | } |
1408a877 |
4342 | ssh2_pkt_defer(); |
65a22376 |
4343 | } |
39065bed |
4344 | ssh_pkt_defersend(); |
0d43337a |
4345 | logevent("Sent password"); |
1408a877 |
4346 | type = AUTH_TYPE_PASSWORD; |
761187b6 |
4347 | } else if (method == AUTH_KEYBOARD_INTERACTIVE) { |
4348 | ssh2_pkt_init(SSH2_MSG_USERAUTH_INFO_RESPONSE); |
4349 | ssh2_pkt_adduint32(num_prompts); |
4350 | ssh2_pkt_addstring(password); |
4351 | memset(password, 0, sizeof(password)); |
4352 | ssh2_pkt_send(); |
4353 | type = AUTH_TYPE_KEYBOARD_INTERACTIVE; |
1408a877 |
4354 | } else { |
32874aea |
4355 | c_write_str |
4356 | ("No supported authentication methods left to try!\r\n"); |
4357 | logevent |
4358 | ("No supported authentications offered. Disconnecting"); |
1408a877 |
4359 | ssh2_pkt_init(SSH2_MSG_DISCONNECT); |
4360 | ssh2_pkt_adduint32(SSH2_DISCONNECT_BY_APPLICATION); |
32874aea |
4361 | ssh2_pkt_addstring |
4362 | ("No supported authentication methods available"); |
4363 | ssh2_pkt_addstring("en"); /* language tag */ |
1408a877 |
4364 | ssh2_pkt_send(); |
4365 | ssh_state = SSH_STATE_CLOSED; |
4366 | crReturnV; |
65a22376 |
4367 | } |
65a22376 |
4368 | } |
1408a877 |
4369 | } while (!we_are_in); |
7cca0d81 |
4370 | |
4371 | /* |
4372 | * Now we're authenticated for the connection protocol. The |
4373 | * connection protocol will automatically have started at this |
4374 | * point; there's no need to send SERVICE_REQUEST. |
4375 | */ |
4376 | |
4377 | /* |
4378 | * So now create a channel with a session in it. |
4379 | */ |
d2371c81 |
4380 | ssh_channels = newtree234(ssh_channelcmp); |
dcbde236 |
4381 | mainchan = smalloc(sizeof(struct ssh_channel)); |
d2371c81 |
4382 | mainchan->localid = alloc_channel_id(); |
7cca0d81 |
4383 | ssh2_pkt_init(SSH2_MSG_CHANNEL_OPEN); |
4384 | ssh2_pkt_addstring("session"); |
d211621f |
4385 | ssh2_pkt_adduint32(mainchan->localid); |
5471d09a |
4386 | mainchan->v.v2.locwindow = OUR_V2_WINSIZE; |
4387 | ssh2_pkt_adduint32(mainchan->v.v2.locwindow); /* our window size */ |
32874aea |
4388 | ssh2_pkt_adduint32(0x4000UL); /* our max pkt size */ |
7cca0d81 |
4389 | ssh2_pkt_send(); |
4390 | crWaitUntilV(ispkt); |
4391 | if (pktin.type != SSH2_MSG_CHANNEL_OPEN_CONFIRMATION) { |
32874aea |
4392 | bombout(("Server refused to open a session")); |
4393 | crReturnV; |
4394 | /* FIXME: error data comes back in FAILURE packet */ |
7cca0d81 |
4395 | } |
d211621f |
4396 | if (ssh2_pkt_getuint32() != mainchan->localid) { |
32874aea |
4397 | bombout(("Server's channel confirmation cited wrong channel")); |
4398 | crReturnV; |
7cca0d81 |
4399 | } |
d211621f |
4400 | mainchan->remoteid = ssh2_pkt_getuint32(); |
783415f8 |
4401 | mainchan->type = CHAN_MAINSESSION; |
4402 | mainchan->closes = 0; |
5471d09a |
4403 | mainchan->v.v2.remwindow = ssh2_pkt_getuint32(); |
4404 | mainchan->v.v2.remmaxpkt = ssh2_pkt_getuint32(); |
4405 | bufchain_init(&mainchan->v.v2.outbuffer); |
783415f8 |
4406 | add234(ssh_channels, mainchan); |
7cca0d81 |
4407 | logevent("Opened channel for session"); |
4408 | |
4409 | /* |
783415f8 |
4410 | * Potentially enable X11 forwarding. |
4411 | */ |
4412 | if (cfg.x11_forward) { |
32874aea |
4413 | char proto[20], data[64]; |
4414 | logevent("Requesting X11 forwarding"); |
4415 | x11_invent_auth(proto, sizeof(proto), data, sizeof(data)); |
4416 | ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST); |
4417 | ssh2_pkt_adduint32(mainchan->remoteid); |
4418 | ssh2_pkt_addstring("x11-req"); |
4419 | ssh2_pkt_addbool(1); /* want reply */ |
4420 | ssh2_pkt_addbool(0); /* many connections */ |
4421 | ssh2_pkt_addstring(proto); |
4422 | ssh2_pkt_addstring(data); |
4423 | ssh2_pkt_adduint32(0); /* screen number */ |
4424 | ssh2_pkt_send(); |
4425 | |
4426 | do { |
4427 | crWaitUntilV(ispkt); |
4428 | if (pktin.type == SSH2_MSG_CHANNEL_WINDOW_ADJUST) { |
4429 | unsigned i = ssh2_pkt_getuint32(); |
4430 | struct ssh_channel *c; |
4431 | c = find234(ssh_channels, &i, ssh_channelfind); |
4432 | if (!c) |
4433 | continue; /* nonexistent channel */ |
5471d09a |
4434 | c->v.v2.remwindow += ssh2_pkt_getuint32(); |
32874aea |
4435 | } |
4436 | } while (pktin.type == SSH2_MSG_CHANNEL_WINDOW_ADJUST); |
4437 | |
4438 | if (pktin.type != SSH2_MSG_CHANNEL_SUCCESS) { |
4439 | if (pktin.type != SSH2_MSG_CHANNEL_FAILURE) { |
c9886e66 |
4440 | bombout(("Unexpected response to X11 forwarding request:" |
4441 | " packet type %d", pktin.type)); |
32874aea |
4442 | crReturnV; |
4443 | } |
4444 | logevent("X11 forwarding refused"); |
4445 | } else { |
4446 | logevent("X11 forwarding enabled"); |
783415f8 |
4447 | ssh_X11_fwd_enabled = TRUE; |
32874aea |
4448 | } |
783415f8 |
4449 | } |
4450 | |
4451 | /* |
bc240b21 |
4452 | * Enable port forwardings. |
4453 | */ |
4454 | { |
4455 | static char *e; /* preserve across crReturn */ |
4456 | char type; |
4457 | int n; |
4458 | int sport,dport; |
4459 | char sports[256], dports[256], host[256]; |
4460 | char buf[1024]; |
4461 | |
4462 | ssh_rportfwds = newtree234(ssh_rportcmp_ssh2); |
4463 | /* Add port forwardings. */ |
4464 | e = cfg.portfwd; |
4465 | while (*e) { |
4466 | type = *e++; |
4467 | n = 0; |
4468 | while (*e && *e != '\t') |
4469 | sports[n++] = *e++; |
4470 | sports[n] = 0; |
4471 | if (*e == '\t') |
4472 | e++; |
4473 | n = 0; |
4474 | while (*e && *e != ':') |
4475 | host[n++] = *e++; |
4476 | host[n] = 0; |
4477 | if (*e == ':') |
4478 | e++; |
4479 | n = 0; |
4480 | while (*e) |
4481 | dports[n++] = *e++; |
4482 | dports[n] = 0; |
4483 | e++; |
4484 | dport = atoi(dports); |
4485 | sport = atoi(sports); |
4486 | if (sport && dport) { |
4487 | if (type == 'L') { |
4488 | pfd_addforward(host, dport, sport); |
4489 | sprintf(buf, "Local port %d forwarding to %s:%d", |
4490 | sport, host, dport); |
4491 | logevent(buf); |
4492 | } else { |
4493 | struct ssh_rportfwd *pf; |
4494 | pf = smalloc(sizeof(*pf)); |
4495 | strcpy(pf->dhost, host); |
4496 | pf->dport = dport; |
4497 | pf->sport = sport; |
4498 | if (add234(ssh_rportfwds, pf) != pf) { |
4499 | sprintf(buf, |
95bc8819 |
4500 | "Duplicate remote port forwarding to %s:%d", |
bc240b21 |
4501 | host, dport); |
4502 | logevent(buf); |
4503 | sfree(pf); |
4504 | } else { |
4505 | sprintf(buf, "Requesting remote port %d (forwarded to %s:%d)", |
4506 | sport, host, dport); |
4507 | logevent(buf); |
4508 | ssh2_pkt_init(SSH2_MSG_GLOBAL_REQUEST); |
4509 | ssh2_pkt_addstring("tcpip-forward"); |
4510 | ssh2_pkt_addbool(1);/* want reply */ |
4511 | ssh2_pkt_addstring("127.0.0.1"); |
4512 | ssh2_pkt_adduint32(sport); |
4513 | ssh2_pkt_send(); |
4514 | |
4515 | do { |
4516 | crWaitUntilV(ispkt); |
4517 | if (pktin.type == SSH2_MSG_CHANNEL_WINDOW_ADJUST) { |
4518 | unsigned i = ssh2_pkt_getuint32(); |
4519 | struct ssh_channel *c; |
4520 | c = find234(ssh_channels, &i, ssh_channelfind); |
4521 | if (!c) |
4522 | continue;/* nonexistent channel */ |
5471d09a |
4523 | c->v.v2.remwindow += ssh2_pkt_getuint32(); |
bc240b21 |
4524 | } |
4525 | } while (pktin.type == SSH2_MSG_CHANNEL_WINDOW_ADJUST); |
4526 | |
4527 | if (pktin.type != SSH2_MSG_REQUEST_SUCCESS) { |
4528 | if (pktin.type != SSH2_MSG_REQUEST_FAILURE) { |
c9886e66 |
4529 | bombout(("Unexpected response to port " |
4530 | "forwarding request: packet type %d", |
4531 | pktin.type)); |
bc240b21 |
4532 | crReturnV; |
4533 | } |
4534 | logevent("Server refused this port forwarding"); |
4535 | } else { |
4536 | logevent("Remote port forwarding enabled"); |
4537 | } |
4538 | } |
4539 | } |
4540 | } |
4541 | } |
4542 | } |
4543 | |
4544 | /* |
36c2a3e9 |
4545 | * Potentially enable agent forwarding. |
4546 | */ |
4547 | if (cfg.agentfwd && agent_exists()) { |
32874aea |
4548 | logevent("Requesting OpenSSH-style agent forwarding"); |
4549 | ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST); |
4550 | ssh2_pkt_adduint32(mainchan->remoteid); |
4551 | ssh2_pkt_addstring("auth-agent-req@openssh.com"); |
4552 | ssh2_pkt_addbool(1); /* want reply */ |
4553 | ssh2_pkt_send(); |
4554 | |
4555 | do { |
4556 | crWaitUntilV(ispkt); |
4557 | if (pktin.type == SSH2_MSG_CHANNEL_WINDOW_ADJUST) { |
4558 | unsigned i = ssh2_pkt_getuint32(); |
4559 | struct ssh_channel *c; |
4560 | c = find234(ssh_channels, &i, ssh_channelfind); |
4561 | if (!c) |
4562 | continue; /* nonexistent channel */ |
5471d09a |
4563 | c->v.v2.remwindow += ssh2_pkt_getuint32(); |
32874aea |
4564 | } |
4565 | } while (pktin.type == SSH2_MSG_CHANNEL_WINDOW_ADJUST); |
4566 | |
4567 | if (pktin.type != SSH2_MSG_CHANNEL_SUCCESS) { |
4568 | if (pktin.type != SSH2_MSG_CHANNEL_FAILURE) { |
c9886e66 |
4569 | bombout(("Unexpected response to agent forwarding request:" |
4570 | " packet type %d", pktin.type)); |
32874aea |
4571 | crReturnV; |
4572 | } |
4573 | logevent("Agent forwarding refused"); |
4574 | } else { |
4575 | logevent("Agent forwarding enabled"); |
36c2a3e9 |
4576 | ssh_agentfwd_enabled = TRUE; |
32874aea |
4577 | } |
36c2a3e9 |
4578 | } |
4579 | |
4580 | /* |
7cca0d81 |
4581 | * Now allocate a pty for the session. |
4582 | */ |
67779be7 |
4583 | if (!cfg.nopty) { |
32874aea |
4584 | ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST); |
4585 | ssh2_pkt_adduint32(mainchan->remoteid); /* recipient channel */ |
4586 | ssh2_pkt_addstring("pty-req"); |
4587 | ssh2_pkt_addbool(1); /* want reply */ |
4588 | ssh2_pkt_addstring(cfg.termtype); |
4589 | ssh2_pkt_adduint32(cols); |
4590 | ssh2_pkt_adduint32(rows); |
4591 | ssh2_pkt_adduint32(0); /* pixel width */ |
4592 | ssh2_pkt_adduint32(0); /* pixel height */ |
4593 | ssh2_pkt_addstring_start(); |
4594 | ssh2_pkt_addstring_data("\0", 1); /* TTY_OP_END, no special options */ |
4595 | ssh2_pkt_send(); |
4596 | ssh_state = SSH_STATE_INTERMED; |
4597 | |
4598 | do { |
4599 | crWaitUntilV(ispkt); |
4600 | if (pktin.type == SSH2_MSG_CHANNEL_WINDOW_ADJUST) { |
4601 | unsigned i = ssh2_pkt_getuint32(); |
4602 | struct ssh_channel *c; |
4603 | c = find234(ssh_channels, &i, ssh_channelfind); |
4604 | if (!c) |
4605 | continue; /* nonexistent channel */ |
5471d09a |
4606 | c->v.v2.remwindow += ssh2_pkt_getuint32(); |
32874aea |
4607 | } |
4608 | } while (pktin.type == SSH2_MSG_CHANNEL_WINDOW_ADJUST); |
4609 | |
4610 | if (pktin.type != SSH2_MSG_CHANNEL_SUCCESS) { |
4611 | if (pktin.type != SSH2_MSG_CHANNEL_FAILURE) { |
c9886e66 |
4612 | bombout(("Unexpected response to pty request:" |
4613 | " packet type %d", pktin.type)); |
32874aea |
4614 | crReturnV; |
4615 | } |
4616 | c_write_str("Server refused to allocate pty\r\n"); |
4617 | ssh_editing = ssh_echoing = 1; |
4618 | } else { |
4619 | logevent("Allocated pty"); |
4620 | } |
0965bee0 |
4621 | } else { |
32874aea |
4622 | ssh_editing = ssh_echoing = 1; |
7cca0d81 |
4623 | } |
4624 | |
4625 | /* |
fd5e5847 |
4626 | * Start a shell or a remote command. We may have to attempt |
4627 | * this twice if the config data has provided a second choice |
4628 | * of command. |
7cca0d81 |
4629 | */ |
fd5e5847 |
4630 | while (1) { |
4631 | int subsys; |
4632 | char *cmd; |
4633 | |
4634 | if (ssh_fallback_cmd) { |
4635 | subsys = cfg.ssh_subsys2; |
4636 | cmd = cfg.remote_cmd_ptr2; |
4637 | } else { |
4638 | subsys = cfg.ssh_subsys; |
4639 | cmd = cfg.remote_cmd_ptr; |
4640 | } |
4641 | |
4642 | ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST); |
4643 | ssh2_pkt_adduint32(mainchan->remoteid); /* recipient channel */ |
4644 | if (subsys) { |
4645 | ssh2_pkt_addstring("subsystem"); |
4646 | ssh2_pkt_addbool(1); /* want reply */ |
4647 | ssh2_pkt_addstring(cmd); |
4648 | } else if (*cmd) { |
4649 | ssh2_pkt_addstring("exec"); |
4650 | ssh2_pkt_addbool(1); /* want reply */ |
4651 | ssh2_pkt_addstring(cmd); |
4652 | } else { |
4653 | ssh2_pkt_addstring("shell"); |
4654 | ssh2_pkt_addbool(1); /* want reply */ |
32874aea |
4655 | } |
fd5e5847 |
4656 | ssh2_pkt_send(); |
4657 | do { |
4658 | crWaitUntilV(ispkt); |
4659 | if (pktin.type == SSH2_MSG_CHANNEL_WINDOW_ADJUST) { |
4660 | unsigned i = ssh2_pkt_getuint32(); |
4661 | struct ssh_channel *c; |
4662 | c = find234(ssh_channels, &i, ssh_channelfind); |
4663 | if (!c) |
4664 | continue; /* nonexistent channel */ |
4665 | c->v.v2.remwindow += ssh2_pkt_getuint32(); |
4666 | } |
4667 | } while (pktin.type == SSH2_MSG_CHANNEL_WINDOW_ADJUST); |
4668 | if (pktin.type != SSH2_MSG_CHANNEL_SUCCESS) { |
4669 | if (pktin.type != SSH2_MSG_CHANNEL_FAILURE) { |
c9886e66 |
4670 | bombout(("Unexpected response to shell/command request:" |
4671 | " packet type %d", pktin.type)); |
fd5e5847 |
4672 | crReturnV; |
4673 | } |
4674 | /* |
4675 | * We failed to start the command. If this is the |
4676 | * fallback command, we really are finished; if it's |
4677 | * not, and if the fallback command exists, try falling |
4678 | * back to it before complaining. |
4679 | */ |
4680 | if (!ssh_fallback_cmd && cfg.remote_cmd_ptr2 != NULL) { |
4681 | logevent("Primary command failed; attempting fallback"); |
4682 | ssh_fallback_cmd = TRUE; |
4683 | continue; |
4684 | } |
4685 | bombout(("Server refused to start a shell/command")); |
32874aea |
4686 | crReturnV; |
fd5e5847 |
4687 | } else { |
4688 | logevent("Started a shell/command"); |
32874aea |
4689 | } |
fd5e5847 |
4690 | break; |
7cca0d81 |
4691 | } |
4692 | |
6e48c3fe |
4693 | ssh_state = SSH_STATE_SESSION; |
4694 | if (size_needed) |
4695 | ssh_size(); |
3687d221 |
4696 | if (eof_needed) |
32874aea |
4697 | ssh_special(TS_EOF); |
6e48c3fe |
4698 | |
7cca0d81 |
4699 | /* |
4700 | * Transfer data! |
4701 | */ |
760e88b2 |
4702 | ldisc_send(NULL, 0, 0); /* cause ldisc to notice changes */ |
8ccc75b0 |
4703 | ssh_send_ok = 1; |
7cca0d81 |
4704 | while (1) { |
32874aea |
4705 | static int try_send; |
e5574168 |
4706 | crReturnV; |
32874aea |
4707 | try_send = FALSE; |
7cca0d81 |
4708 | if (ispkt) { |
4709 | if (pktin.type == SSH2_MSG_CHANNEL_DATA || |
32874aea |
4710 | pktin.type == SSH2_MSG_CHANNEL_EXTENDED_DATA) { |
4711 | char *data; |
4712 | int length; |
4713 | unsigned i = ssh2_pkt_getuint32(); |
4714 | struct ssh_channel *c; |
4715 | c = find234(ssh_channels, &i, ssh_channelfind); |
4716 | if (!c) |
4717 | continue; /* nonexistent channel */ |
4718 | if (pktin.type == SSH2_MSG_CHANNEL_EXTENDED_DATA && |
4719 | ssh2_pkt_getuint32() != SSH2_EXTENDED_DATA_STDERR) |
4720 | continue; /* extended but not stderr */ |
4721 | ssh2_pkt_getstring(&data, &length); |
4722 | if (data) { |
5471d09a |
4723 | int bufsize; |
4724 | c->v.v2.locwindow -= length; |
32874aea |
4725 | switch (c->type) { |
4726 | case CHAN_MAINSESSION: |
5471d09a |
4727 | bufsize = |
4728 | from_backend(pktin.type == |
4729 | SSH2_MSG_CHANNEL_EXTENDED_DATA, |
4730 | data, length); |
32874aea |
4731 | break; |
4732 | case CHAN_X11: |
5471d09a |
4733 | bufsize = x11_send(c->u.x11.s, data, length); |
32874aea |
4734 | break; |
d74d141c |
4735 | case CHAN_SOCKDATA: |
5471d09a |
4736 | bufsize = pfd_send(c->u.pfd.s, data, length); |
bc240b21 |
4737 | break; |
36c2a3e9 |
4738 | case CHAN_AGENT: |
32874aea |
4739 | while (length > 0) { |
4740 | if (c->u.a.lensofar < 4) { |
4741 | int l = min(4 - c->u.a.lensofar, length); |
4742 | memcpy(c->u.a.msglen + c->u.a.lensofar, |
4743 | data, l); |
4744 | data += l; |
4745 | length -= l; |
4746 | c->u.a.lensofar += l; |
4747 | } |
4748 | if (c->u.a.lensofar == 4) { |
4749 | c->u.a.totallen = |
4750 | 4 + GET_32BIT(c->u.a.msglen); |
4751 | c->u.a.message = smalloc(c->u.a.totallen); |
4752 | memcpy(c->u.a.message, c->u.a.msglen, 4); |
4753 | } |
4754 | if (c->u.a.lensofar >= 4 && length > 0) { |
4755 | int l = |
4756 | min(c->u.a.totallen - c->u.a.lensofar, |
4757 | length); |
4758 | memcpy(c->u.a.message + c->u.a.lensofar, |
4759 | data, l); |
4760 | data += l; |
4761 | length -= l; |
4762 | c->u.a.lensofar += l; |
4763 | } |
4764 | if (c->u.a.lensofar == c->u.a.totallen) { |
4765 | void *reply, *sentreply; |
4766 | int replylen; |
4767 | agent_query(c->u.a.message, |
4768 | c->u.a.totallen, &reply, |
4769 | &replylen); |
4770 | if (reply) |
4771 | sentreply = reply; |
4772 | else { |
4773 | /* Fake SSH_AGENT_FAILURE. */ |
4774 | sentreply = "\0\0\0\1\5"; |
4775 | replylen = 5; |
4776 | } |
4777 | ssh2_add_channel_data(c, sentreply, |
4778 | replylen); |
36c2a3e9 |
4779 | try_send = TRUE; |
32874aea |
4780 | if (reply) |
4781 | sfree(reply); |
4782 | sfree(c->u.a.message); |
4783 | c->u.a.lensofar = 0; |
4784 | } |
4785 | } |
5471d09a |
4786 | bufsize = 0; |
32874aea |
4787 | break; |
4788 | } |
4789 | /* |
5471d09a |
4790 | * If we are not buffering too much data, |
4791 | * enlarge the window again at the remote side. |
32874aea |
4792 | */ |
5471d09a |
4793 | if (bufsize < OUR_V2_WINSIZE) |
4794 | ssh2_set_window(c, OUR_V2_WINSIZE - bufsize); |
32874aea |
4795 | } |
7cca0d81 |
4796 | } else if (pktin.type == SSH2_MSG_DISCONNECT) { |
32874aea |
4797 | ssh_state = SSH_STATE_CLOSED; |
d211621f |
4798 | logevent("Received disconnect message"); |
32874aea |
4799 | crReturnV; |
d211621f |
4800 | } else if (pktin.type == SSH2_MSG_CHANNEL_EOF) { |
32874aea |
4801 | unsigned i = ssh2_pkt_getuint32(); |
4802 | struct ssh_channel *c; |
4803 | |
4804 | c = find234(ssh_channels, &i, ssh_channelfind); |
4805 | if (!c) |
4806 | continue; /* nonexistent channel */ |
4807 | |
4808 | if (c->type == CHAN_X11) { |
4809 | /* |
4810 | * Remote EOF on an X11 channel means we should |
4811 | * wrap up and close the channel ourselves. |
4812 | */ |
4813 | x11_close(c->u.x11.s); |
4814 | sshfwd_close(c); |
4815 | } else if (c->type == CHAN_AGENT) { |
36c2a3e9 |
4816 | sshfwd_close(c); |
d74d141c |
4817 | } else if (c->type == CHAN_SOCKDATA) { |
bc240b21 |
4818 | pfd_close(c->u.pfd.s); |
4819 | sshfwd_close(c); |
36c2a3e9 |
4820 | } |
d211621f |
4821 | } else if (pktin.type == SSH2_MSG_CHANNEL_CLOSE) { |
32874aea |
4822 | unsigned i = ssh2_pkt_getuint32(); |
4823 | struct ssh_channel *c; |
4824 | |
4825 | c = find234(ssh_channels, &i, ssh_channelfind); |
4826 | if (!c) |
4827 | continue; /* nonexistent channel */ |
32874aea |
4828 | /* Do pre-close processing on the channel. */ |
4829 | switch (c->type) { |
4830 | case CHAN_MAINSESSION: |
4831 | break; /* nothing to see here, move along */ |
4832 | case CHAN_X11: |
92f157bd |
4833 | if (c->u.x11.s != NULL) |
4834 | x11_close(c->u.x11.s); |
4835 | sshfwd_close(c); |
32874aea |
4836 | break; |
4837 | case CHAN_AGENT: |
92f157bd |
4838 | sshfwd_close(c); |
32874aea |
4839 | break; |
d74d141c |
4840 | case CHAN_SOCKDATA: |
92f157bd |
4841 | if (c->u.pfd.s != NULL) |
4842 | pfd_close(c->u.pfd.s); |
4843 | sshfwd_close(c); |
bc240b21 |
4844 | break; |
32874aea |
4845 | } |
92f157bd |
4846 | if (c->closes == 0) { |
4847 | ssh2_pkt_init(SSH2_MSG_CHANNEL_CLOSE); |
4848 | ssh2_pkt_adduint32(c->remoteid); |
4849 | ssh2_pkt_send(); |
4850 | } |
32874aea |
4851 | del234(ssh_channels, c); |
5471d09a |
4852 | bufchain_clear(&c->v.v2.outbuffer); |
32874aea |
4853 | sfree(c); |
4854 | |
4855 | /* |
4856 | * See if that was the last channel left open. |
4857 | */ |
4858 | if (count234(ssh_channels) == 0) { |
4859 | logevent("All channels closed. Disconnecting"); |
4860 | ssh2_pkt_init(SSH2_MSG_DISCONNECT); |
4861 | ssh2_pkt_adduint32(SSH2_DISCONNECT_BY_APPLICATION); |
4862 | ssh2_pkt_addstring("All open channels closed"); |
4863 | ssh2_pkt_addstring("en"); /* language tag */ |
4864 | ssh2_pkt_send(); |
4865 | ssh_state = SSH_STATE_CLOSED; |
4866 | crReturnV; |
4867 | } |
4868 | continue; /* remote sends close; ignore (FIXME) */ |
7cca0d81 |
4869 | } else if (pktin.type == SSH2_MSG_CHANNEL_WINDOW_ADJUST) { |
32874aea |
4870 | unsigned i = ssh2_pkt_getuint32(); |
4871 | struct ssh_channel *c; |
4872 | c = find234(ssh_channels, &i, ssh_channelfind); |
4873 | if (!c) |
4874 | continue; /* nonexistent channel */ |
5471d09a |
4875 | c->v.v2.remwindow += ssh2_pkt_getuint32(); |
32874aea |
4876 | try_send = TRUE; |
bc240b21 |
4877 | } else if (pktin.type == SSH2_MSG_CHANNEL_OPEN_CONFIRMATION) { |
4878 | unsigned i = ssh2_pkt_getuint32(); |
4879 | struct ssh_channel *c; |
4880 | c = find234(ssh_channels, &i, ssh_channelfind); |
4881 | if (!c) |
4882 | continue; /* nonexistent channel */ |
4883 | if (c->type != CHAN_SOCKDATA_DORMANT) |
4884 | continue; /* dunno why they're confirming this */ |
4885 | c->remoteid = ssh2_pkt_getuint32(); |
4886 | c->type = CHAN_SOCKDATA; |
5471d09a |
4887 | c->v.v2.remwindow = ssh2_pkt_getuint32(); |
4888 | c->v.v2.remmaxpkt = ssh2_pkt_getuint32(); |
4889 | bufchain_init(&c->v.v2.outbuffer); |
4ed34d25 |
4890 | if (c->u.pfd.s) |
4891 | pfd_confirm(c->u.pfd.s); |
4892 | if (c->closes) { |
4893 | /* |
4894 | * We have a pending close on this channel, |
4895 | * which we decided on before the server acked |
4896 | * the channel open. So now we know the |
4897 | * remoteid, we can close it again. |
4898 | */ |
4899 | ssh2_pkt_init(SSH2_MSG_CHANNEL_CLOSE); |
4900 | ssh2_pkt_adduint32(c->remoteid); |
4901 | ssh2_pkt_send(); |
4902 | } |
724cface |
4903 | } else if (pktin.type == SSH2_MSG_CHANNEL_OPEN_FAILURE) { |
4904 | unsigned i = ssh2_pkt_getuint32(); |
4905 | struct ssh_channel *c; |
4906 | c = find234(ssh_channels, &i, ssh_channelfind); |
4907 | if (!c) |
4908 | continue; /* nonexistent channel */ |
4909 | if (c->type != CHAN_SOCKDATA_DORMANT) |
4910 | continue; /* dunno why they're failing this */ |
4911 | |
4912 | logevent("Forwarded connection refused by server"); |
4913 | |
4914 | pfd_close(c->u.pfd.s); |
4915 | |
4916 | del234(ssh_channels, c); |
4917 | sfree(c); |
ebb0a590 |
4918 | } else if (pktin.type == SSH2_MSG_CHANNEL_REQUEST) { |
4919 | unsigned localid; |
4920 | char *type; |
4921 | int typelen, want_reply; |
4922 | struct ssh_channel *c; |
4923 | |
4924 | localid = ssh2_pkt_getuint32(); |
4925 | ssh2_pkt_getstring(&type, &typelen); |
4926 | want_reply = ssh2_pkt_getbool(); |
4927 | |
4928 | /* |
4929 | * First, check that the channel exists. Otherwise, |
4930 | * we can instantly disconnect with a rude message. |
4931 | */ |
4932 | c = find234(ssh_channels, &localid, ssh_channelfind); |
4933 | if (!c) { |
4934 | char buf[80]; |
4935 | sprintf(buf, "Received channel request for nonexistent" |
4936 | " channel %d", localid); |
4937 | logevent(buf); |
4938 | ssh2_pkt_init(SSH2_MSG_DISCONNECT); |
4939 | ssh2_pkt_adduint32(SSH2_DISCONNECT_BY_APPLICATION); |
4940 | ssh2_pkt_addstring(buf); |
4941 | ssh2_pkt_addstring("en"); /* language tag */ |
4942 | ssh2_pkt_send(); |
4943 | connection_fatal(buf); |
4944 | ssh_state = SSH_STATE_CLOSED; |
4945 | crReturnV; |
4946 | } |
4947 | |
4948 | /* |
4949 | * We don't recognise any form of channel request, |
4950 | * so we now either ignore the request or respond |
4951 | * with CHANNEL_FAILURE, depending on want_reply. |
4952 | */ |
4953 | if (want_reply) { |
4954 | ssh2_pkt_init(SSH2_MSG_CHANNEL_FAILURE); |
4955 | ssh2_pkt_adduint32(c->remoteid); |
4956 | ssh2_pkt_send(); |
4957 | } |
783415f8 |
4958 | } else if (pktin.type == SSH2_MSG_CHANNEL_OPEN) { |
32874aea |
4959 | char *type; |
4960 | int typelen; |
4961 | char *error = NULL; |
4962 | struct ssh_channel *c; |
bc240b21 |
4963 | unsigned remid, winsize, pktsize; |
32874aea |
4964 | ssh2_pkt_getstring(&type, &typelen); |
4965 | c = smalloc(sizeof(struct ssh_channel)); |
4966 | |
bc240b21 |
4967 | remid = ssh2_pkt_getuint32(); |
4968 | winsize = ssh2_pkt_getuint32(); |
4969 | pktsize = ssh2_pkt_getuint32(); |
4970 | |
32874aea |
4971 | if (typelen == 3 && !memcmp(type, "x11", 3)) { |
4972 | if (!ssh_X11_fwd_enabled) |
4973 | error = "X11 forwarding is not enabled"; |
4974 | else if (x11_init(&c->u.x11.s, cfg.x11_display, c) != |
4975 | NULL) { |
4976 | error = "Unable to open an X11 connection"; |
4977 | } else { |
4978 | c->type = CHAN_X11; |
4979 | } |
bc240b21 |
4980 | } else if (typelen == 15 && |
4981 | !memcmp(type, "forwarded-tcpip", 15)) { |
4982 | struct ssh_rportfwd pf, *realpf; |
4983 | char *dummy; |
4984 | int dummylen; |
4985 | ssh2_pkt_getstring(&dummy, &dummylen);/* skip address */ |
4986 | pf.sport = ssh2_pkt_getuint32(); |
4987 | realpf = find234(ssh_rportfwds, &pf, NULL); |
4988 | if (realpf == NULL) { |
4989 | error = "Remote port is not recognised"; |
4990 | } else { |
4991 | char *e = pfd_newconnect(&c->u.pfd.s, realpf->dhost, |
4992 | realpf->dport, c); |
4993 | char buf[1024]; |
4994 | sprintf(buf, "Received remote port open request for %s:%d", |
4995 | realpf->dhost, realpf->dport); |
4996 | logevent(buf); |
4997 | if (e != NULL) { |
4998 | sprintf(buf, "Port open failed: %s", e); |
4999 | logevent(buf); |
5000 | error = "Port open failed"; |
5001 | } else { |
5002 | logevent("Forwarded port opened successfully"); |
5003 | c->type = CHAN_SOCKDATA; |
5004 | } |
5005 | } |
32874aea |
5006 | } else if (typelen == 22 && |
36c2a3e9 |
5007 | !memcmp(type, "auth-agent@openssh.com", 3)) { |
32874aea |
5008 | if (!ssh_agentfwd_enabled) |
5009 | error = "Agent forwarding is not enabled"; |
36c2a3e9 |
5010 | else { |
32874aea |
5011 | c->type = CHAN_AGENT; /* identify channel type */ |
36c2a3e9 |
5012 | c->u.a.lensofar = 0; |
32874aea |
5013 | } |
5014 | } else { |
5015 | error = "Unsupported channel type requested"; |
5016 | } |
5017 | |
bc240b21 |
5018 | c->remoteid = remid; |
32874aea |
5019 | if (error) { |
5020 | ssh2_pkt_init(SSH2_MSG_CHANNEL_OPEN_FAILURE); |
5021 | ssh2_pkt_adduint32(c->remoteid); |
5022 | ssh2_pkt_adduint32(SSH2_OPEN_CONNECT_FAILED); |
5023 | ssh2_pkt_addstring(error); |
5024 | ssh2_pkt_addstring("en"); /* language tag */ |
5025 | ssh2_pkt_send(); |
5026 | sfree(c); |
5027 | } else { |
5028 | c->localid = alloc_channel_id(); |
5029 | c->closes = 0; |
5471d09a |
5030 | c->v.v2.locwindow = OUR_V2_WINSIZE; |
5031 | c->v.v2.remwindow = winsize; |
5032 | c->v.v2.remmaxpkt = pktsize; |
5033 | bufchain_init(&c->v.v2.outbuffer); |
32874aea |
5034 | add234(ssh_channels, c); |
5035 | ssh2_pkt_init(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); |
5036 | ssh2_pkt_adduint32(c->remoteid); |
5037 | ssh2_pkt_adduint32(c->localid); |
5471d09a |
5038 | ssh2_pkt_adduint32(c->v.v2.locwindow); |
32874aea |
5039 | ssh2_pkt_adduint32(0x4000UL); /* our max pkt size */ |
5040 | ssh2_pkt_send(); |
5041 | } |
7cca0d81 |
5042 | } else { |
8d5de777 |
5043 | bombout(("Strange packet received: type %d", pktin.type)); |
32874aea |
5044 | crReturnV; |
7cca0d81 |
5045 | } |
5046 | } else { |
32874aea |
5047 | /* |
5048 | * We have spare data. Add it to the channel buffer. |
5049 | */ |
5050 | ssh2_add_channel_data(mainchan, in, inlen); |
5051 | try_send = TRUE; |
5052 | } |
5053 | if (try_send) { |
5054 | int i; |
5055 | struct ssh_channel *c; |
5056 | /* |
5057 | * Try to send data on all channels if we can. |
5058 | */ |
5471d09a |
5059 | for (i = 0; NULL != (c = index234(ssh_channels, i)); i++) { |
5060 | int bufsize = ssh2_try_send(c); |
5061 | if (bufsize == 0) { |
5062 | switch (c->type) { |
5063 | case CHAN_MAINSESSION: |
5064 | /* stdin need not receive an unthrottle |
5065 | * notification since it will be polled */ |
5066 | break; |
5067 | case CHAN_X11: |
5068 | x11_unthrottle(c->u.x11.s); |
5069 | break; |
5070 | case CHAN_AGENT: |
5071 | /* agent sockets are request/response and need no |
5072 | * buffer management */ |
5073 | break; |
5074 | case CHAN_SOCKDATA: |
5075 | pfd_unthrottle(c->u.pfd.s); |
5076 | break; |
5077 | } |
5078 | } |
5079 | } |
7cca0d81 |
5080 | } |
e5574168 |
5081 | } |
5082 | |
5083 | crFinishV; |
5084 | } |
5085 | |
5086 | /* |
7cca0d81 |
5087 | * Handle the top-level SSH2 protocol. |
5088 | */ |
5089 | static void ssh2_protocol(unsigned char *in, int inlen, int ispkt) |
5090 | { |
5091 | if (do_ssh2_transport(in, inlen, ispkt) == 0) |
32874aea |
5092 | return; |
7cca0d81 |
5093 | do_ssh2_authconn(in, inlen, ispkt); |
5094 | } |
5095 | |
5096 | /* |
8df7a775 |
5097 | * Called to set up the connection. |
374330e2 |
5098 | * |
5099 | * Returns an error message, or NULL on success. |
374330e2 |
5100 | */ |
32874aea |
5101 | static char *ssh_init(char *host, int port, char **realhost) |
5102 | { |
fb09bf1c |
5103 | char *p; |
32874aea |
5104 | |
8f203108 |
5105 | #ifdef MSCRYPTOAPI |
32874aea |
5106 | if (crypto_startup() == 0) |
8f203108 |
5107 | return "Microsoft high encryption pack not installed!"; |
5108 | #endif |
374330e2 |
5109 | |
8df7a775 |
5110 | ssh_send_ok = 0; |
0965bee0 |
5111 | ssh_editing = 0; |
5112 | ssh_echoing = 0; |
5471d09a |
5113 | ssh1_throttle_count = 0; |
5114 | ssh_overall_bufsize = 0; |
fd5e5847 |
5115 | ssh_fallback_cmd = 0; |
8df7a775 |
5116 | |
fb09bf1c |
5117 | p = connect_to_host(host, port, realhost); |
5118 | if (p != NULL) |
5119 | return p; |
374330e2 |
5120 | |
374330e2 |
5121 | return NULL; |
5122 | } |
5123 | |
5124 | /* |
374330e2 |
5125 | * Called to send data down the Telnet connection. |
5126 | */ |
5471d09a |
5127 | static int ssh_send(char *buf, int len) |
32874aea |
5128 | { |
f78051a1 |
5129 | if (s == NULL || ssh_protocol == NULL) |
5471d09a |
5130 | return 0; |
374330e2 |
5131 | |
5132 | ssh_protocol(buf, len, 0); |
5471d09a |
5133 | |
5134 | return ssh_sendbuffer(); |
5135 | } |
5136 | |
5137 | /* |
5138 | * Called to query the current amount of buffered stdin data. |
5139 | */ |
5140 | static int ssh_sendbuffer(void) |
5141 | { |
5142 | int override_value; |
5143 | |
5144 | if (s == NULL || ssh_protocol == NULL) |
5145 | return 0; |
5146 | |
5147 | /* |
5148 | * If the SSH socket itself has backed up, add the total backup |
5149 | * size on that to any individual buffer on the stdin channel. |
5150 | */ |
5151 | override_value = 0; |
5152 | if (ssh_throttled_all) |
5153 | override_value = ssh_overall_bufsize; |
5154 | |
5155 | if (ssh_version == 1) { |
5156 | return override_value; |
5157 | } else if (ssh_version == 2) { |
5158 | if (!mainchan || mainchan->closes > 0) |
5159 | return override_value; |
5160 | else |
5161 | return override_value + bufchain_size(&mainchan->v.v2.outbuffer); |
5162 | } |
5163 | |
5164 | return 0; |
374330e2 |
5165 | } |
5166 | |
5167 | /* |
6e48c3fe |
5168 | * Called to set the size of the window from SSH's POV. |
374330e2 |
5169 | */ |
32874aea |
5170 | static void ssh_size(void) |
5171 | { |
374330e2 |
5172 | switch (ssh_state) { |
5173 | case SSH_STATE_BEFORE_SIZE: |
3687d221 |
5174 | case SSH_STATE_PREPACKET: |
21248260 |
5175 | case SSH_STATE_CLOSED: |
374330e2 |
5176 | break; /* do nothing */ |
5177 | case SSH_STATE_INTERMED: |
5178 | size_needed = TRUE; /* buffer for later */ |
5179 | break; |
5180 | case SSH_STATE_SESSION: |
32874aea |
5181 | if (!cfg.nopty) { |
5182 | if (ssh_version == 1) { |
5183 | send_packet(SSH1_CMSG_WINDOW_SIZE, |
5184 | PKT_INT, rows, PKT_INT, cols, |
5185 | PKT_INT, 0, PKT_INT, 0, PKT_END); |
5186 | } else { |
5187 | ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST); |
5188 | ssh2_pkt_adduint32(mainchan->remoteid); |
5189 | ssh2_pkt_addstring("window-change"); |
5190 | ssh2_pkt_addbool(0); |
5191 | ssh2_pkt_adduint32(cols); |
5192 | ssh2_pkt_adduint32(rows); |
5193 | ssh2_pkt_adduint32(0); |
5194 | ssh2_pkt_adduint32(0); |
5195 | ssh2_pkt_send(); |
5196 | } |
5197 | } |
5198 | break; |
374330e2 |
5199 | } |
5200 | } |
5201 | |
5202 | /* |
6abbf9e3 |
5203 | * Send Telnet special codes. TS_EOF is useful for `plink', so you |
5204 | * can send an EOF and collect resulting output (e.g. `plink |
5205 | * hostname sort'). |
374330e2 |
5206 | */ |
32874aea |
5207 | static void ssh_special(Telnet_Special code) |
5208 | { |
6abbf9e3 |
5209 | if (code == TS_EOF) { |
32874aea |
5210 | if (ssh_state != SSH_STATE_SESSION) { |
5211 | /* |
5212 | * Buffer the EOF in case we are pre-SESSION, so we can |
5213 | * send it as soon as we reach SESSION. |
5214 | */ |
5215 | if (code == TS_EOF) |
5216 | eof_needed = TRUE; |
5217 | return; |
5218 | } |
5219 | if (ssh_version == 1) { |
5220 | send_packet(SSH1_CMSG_EOF, PKT_END); |
5221 | } else { |
5222 | ssh2_pkt_init(SSH2_MSG_CHANNEL_EOF); |
5223 | ssh2_pkt_adduint32(mainchan->remoteid); |
5224 | ssh2_pkt_send(); |
5225 | } |
5226 | logevent("Sent EOF message"); |
ec55b220 |
5227 | } else if (code == TS_PING) { |
32874aea |
5228 | if (ssh_state == SSH_STATE_CLOSED |
5229 | || ssh_state == SSH_STATE_PREPACKET) return; |
5230 | if (ssh_version == 1) { |
5231 | send_packet(SSH1_MSG_IGNORE, PKT_STR, "", PKT_END); |
5232 | } else { |
5233 | ssh2_pkt_init(SSH2_MSG_IGNORE); |
5234 | ssh2_pkt_addstring_start(); |
5235 | ssh2_pkt_send(); |
5236 | } |
6abbf9e3 |
5237 | } else { |
32874aea |
5238 | /* do nothing */ |
6abbf9e3 |
5239 | } |
374330e2 |
5240 | } |
5241 | |
d74d141c |
5242 | void *new_sock_channel(Socket s) |
5243 | { |
5244 | struct ssh_channel *c; |
5245 | c = smalloc(sizeof(struct ssh_channel)); |
5246 | |
5247 | if (c) { |
bc240b21 |
5248 | c->remoteid = -1; /* to be set when open confirmed */ |
d74d141c |
5249 | c->localid = alloc_channel_id(); |
5250 | c->closes = 0; |
bc240b21 |
5251 | c->type = CHAN_SOCKDATA_DORMANT;/* identify channel type */ |
d74d141c |
5252 | c->u.pfd.s = s; |
5253 | add234(ssh_channels, c); |
5254 | } |
5255 | return c; |
5256 | } |
5257 | |
5471d09a |
5258 | /* |
5259 | * This is called when stdout/stderr (the entity to which |
5260 | * from_backend sends data) manages to clear some backlog. |
5261 | */ |
5262 | void ssh_unthrottle(int bufsize) |
5263 | { |
5264 | if (ssh_version == 1) { |
90347b95 |
5265 | if (ssh1_stdout_throttling && bufsize < SSH1_BUFFER_LIMIT) { |
5471d09a |
5266 | ssh1_stdout_throttling = 0; |
5267 | ssh1_throttle(-1); |
5268 | } |
5269 | } else { |
5270 | if (mainchan && mainchan->closes == 0) |
5271 | ssh2_set_window(mainchan, OUR_V2_WINSIZE - bufsize); |
5272 | } |
5273 | } |
5274 | |
d74d141c |
5275 | void ssh_send_port_open(void *channel, char *hostname, int port, char *org) |
5276 | { |
5277 | struct ssh_channel *c = (struct ssh_channel *)channel; |
5278 | char buf[1024]; |
5279 | |
5280 | sprintf(buf, "Opening forwarded connection to %.512s:%d", hostname, port); |
5281 | logevent(buf); |
5282 | |
bc240b21 |
5283 | if (ssh_version == 1) { |
5284 | send_packet(SSH1_MSG_PORT_OPEN, |
5285 | PKT_INT, c->localid, |
5286 | PKT_STR, hostname, |
5287 | PKT_INT, port, |
5288 | //PKT_STR, <org:orgport>, |
5289 | PKT_END); |
5290 | } else { |
5291 | ssh2_pkt_init(SSH2_MSG_CHANNEL_OPEN); |
5292 | ssh2_pkt_addstring("direct-tcpip"); |
5293 | ssh2_pkt_adduint32(c->localid); |
5471d09a |
5294 | c->v.v2.locwindow = OUR_V2_WINSIZE; |
5295 | ssh2_pkt_adduint32(c->v.v2.locwindow);/* our window size */ |
bc240b21 |
5296 | ssh2_pkt_adduint32(0x4000UL); /* our max pkt size */ |
5297 | ssh2_pkt_addstring(hostname); |
5298 | ssh2_pkt_adduint32(port); |
5299 | /* |
5300 | * We make up values for the originator data; partly it's |
5301 | * too much hassle to keep track, and partly I'm not |
5302 | * convinced the server should be told details like that |
5303 | * about my local network configuration. |
5304 | */ |
5305 | ssh2_pkt_addstring("client-side-connection"); |
5306 | ssh2_pkt_adduint32(0); |
5307 | ssh2_pkt_send(); |
5308 | } |
d74d141c |
5309 | } |
5310 | |
5311 | |
32874aea |
5312 | static Socket ssh_socket(void) |
5313 | { |
5314 | return s; |
5315 | } |
8ccc75b0 |
5316 | |
32874aea |
5317 | static int ssh_sendok(void) |
5318 | { |
5319 | return ssh_send_ok; |
5320 | } |
fb09bf1c |
5321 | |
32874aea |
5322 | static int ssh_ldisc(int option) |
5323 | { |
5324 | if (option == LD_ECHO) |
5325 | return ssh_echoing; |
5326 | if (option == LD_EDIT) |
5327 | return ssh_editing; |
0965bee0 |
5328 | return FALSE; |
5329 | } |
5330 | |
374330e2 |
5331 | Backend ssh_backend = { |
5332 | ssh_init, |
374330e2 |
5333 | ssh_send, |
5471d09a |
5334 | ssh_sendbuffer, |
374330e2 |
5335 | ssh_size, |
4017be6d |
5336 | ssh_special, |
8ccc75b0 |
5337 | ssh_socket, |
97db3be4 |
5338 | ssh_sendok, |
0965bee0 |
5339 | ssh_ldisc, |
5471d09a |
5340 | ssh_unthrottle, |
97db3be4 |
5341 | 22 |
bc240b21 |
5342 | }; |