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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 | |
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18 | #define logevent(s) { logevent(s); \ |
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19 | if ((flags & FLAG_STDERR) && (flags & FLAG_VERBOSE)) \ |
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20 | fprintf(stderr, "%s\n", s); } |
21 | |
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22 | #define bombout(msg) ( ssh_state = SSH_STATE_CLOSED, sk_close(s), \ |
23 | s = NULL, connection_fatal msg ) |
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24 | |
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25 | #define SSH1_MSG_DISCONNECT 1 /* 0x1 */ |
26 | #define SSH1_SMSG_PUBLIC_KEY 2 /* 0x2 */ |
27 | #define SSH1_CMSG_SESSION_KEY 3 /* 0x3 */ |
28 | #define SSH1_CMSG_USER 4 /* 0x4 */ |
29 | #define SSH1_CMSG_AUTH_RSA 6 /* 0x6 */ |
30 | #define SSH1_SMSG_AUTH_RSA_CHALLENGE 7 /* 0x7 */ |
31 | #define SSH1_CMSG_AUTH_RSA_RESPONSE 8 /* 0x8 */ |
32 | #define SSH1_CMSG_AUTH_PASSWORD 9 /* 0x9 */ |
33 | #define SSH1_CMSG_REQUEST_PTY 10 /* 0xa */ |
34 | #define SSH1_CMSG_WINDOW_SIZE 11 /* 0xb */ |
35 | #define SSH1_CMSG_EXEC_SHELL 12 /* 0xc */ |
36 | #define SSH1_CMSG_EXEC_CMD 13 /* 0xd */ |
37 | #define SSH1_SMSG_SUCCESS 14 /* 0xe */ |
38 | #define SSH1_SMSG_FAILURE 15 /* 0xf */ |
39 | #define SSH1_CMSG_STDIN_DATA 16 /* 0x10 */ |
40 | #define SSH1_SMSG_STDOUT_DATA 17 /* 0x11 */ |
41 | #define SSH1_SMSG_STDERR_DATA 18 /* 0x12 */ |
42 | #define SSH1_CMSG_EOF 19 /* 0x13 */ |
43 | #define SSH1_SMSG_EXIT_STATUS 20 /* 0x14 */ |
44 | #define SSH1_MSG_CHANNEL_OPEN_CONFIRMATION 21 /* 0x15 */ |
45 | #define SSH1_MSG_CHANNEL_OPEN_FAILURE 22 /* 0x16 */ |
46 | #define SSH1_MSG_CHANNEL_DATA 23 /* 0x17 */ |
47 | #define SSH1_MSG_CHANNEL_CLOSE 24 /* 0x18 */ |
48 | #define SSH1_MSG_CHANNEL_CLOSE_CONFIRMATION 25 /* 0x19 */ |
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49 | #define SSH1_SMSG_X11_OPEN 27 /* 0x1b */ |
50 | #define SSH1_CMSG_PORT_FORWARD_REQUEST 28 /* 0x1c */ |
51 | #define SSH1_MSG_PORT_OPEN 29 /* 0x1d */ |
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52 | #define SSH1_CMSG_AGENT_REQUEST_FORWARDING 30 /* 0x1e */ |
53 | #define SSH1_SMSG_AGENT_OPEN 31 /* 0x1f */ |
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54 | #define SSH1_MSG_IGNORE 32 /* 0x20 */ |
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55 | #define SSH1_CMSG_EXIT_CONFIRMATION 33 /* 0x21 */ |
56 | #define SSH1_CMSG_X11_REQUEST_FORWARDING 34 /* 0x22 */ |
57 | #define SSH1_CMSG_AUTH_RHOSTS_RSA 35 /* 0x23 */ |
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58 | #define SSH1_MSG_DEBUG 36 /* 0x24 */ |
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59 | #define SSH1_CMSG_REQUEST_COMPRESSION 37 /* 0x25 */ |
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60 | #define SSH1_CMSG_AUTH_TIS 39 /* 0x27 */ |
61 | #define SSH1_SMSG_AUTH_TIS_CHALLENGE 40 /* 0x28 */ |
62 | #define SSH1_CMSG_AUTH_TIS_RESPONSE 41 /* 0x29 */ |
63 | #define SSH1_CMSG_AUTH_CCARD 70 /* 0x46 */ |
64 | #define SSH1_SMSG_AUTH_CCARD_CHALLENGE 71 /* 0x47 */ |
65 | #define SSH1_CMSG_AUTH_CCARD_RESPONSE 72 /* 0x48 */ |
66 | |
67 | #define SSH1_AUTH_TIS 5 /* 0x5 */ |
68 | #define SSH1_AUTH_CCARD 16 /* 0x10 */ |
69 | |
70 | #define SSH_AGENTC_REQUEST_RSA_IDENTITIES 1 /* 0x1 */ |
71 | #define SSH_AGENT_RSA_IDENTITIES_ANSWER 2 /* 0x2 */ |
72 | #define SSH_AGENTC_RSA_CHALLENGE 3 /* 0x3 */ |
73 | #define SSH_AGENT_RSA_RESPONSE 4 /* 0x4 */ |
74 | #define SSH_AGENT_FAILURE 5 /* 0x5 */ |
75 | #define SSH_AGENT_SUCCESS 6 /* 0x6 */ |
76 | #define SSH_AGENTC_ADD_RSA_IDENTITY 7 /* 0x7 */ |
77 | #define SSH_AGENTC_REMOVE_RSA_IDENTITY 8 /* 0x8 */ |
78 | |
79 | #define SSH2_MSG_DISCONNECT 1 /* 0x1 */ |
80 | #define SSH2_MSG_IGNORE 2 /* 0x2 */ |
81 | #define SSH2_MSG_UNIMPLEMENTED 3 /* 0x3 */ |
82 | #define SSH2_MSG_DEBUG 4 /* 0x4 */ |
83 | #define SSH2_MSG_SERVICE_REQUEST 5 /* 0x5 */ |
84 | #define SSH2_MSG_SERVICE_ACCEPT 6 /* 0x6 */ |
85 | #define SSH2_MSG_KEXINIT 20 /* 0x14 */ |
86 | #define SSH2_MSG_NEWKEYS 21 /* 0x15 */ |
87 | #define SSH2_MSG_KEXDH_INIT 30 /* 0x1e */ |
88 | #define SSH2_MSG_KEXDH_REPLY 31 /* 0x1f */ |
89 | #define SSH2_MSG_USERAUTH_REQUEST 50 /* 0x32 */ |
90 | #define SSH2_MSG_USERAUTH_FAILURE 51 /* 0x33 */ |
91 | #define SSH2_MSG_USERAUTH_SUCCESS 52 /* 0x34 */ |
92 | #define SSH2_MSG_USERAUTH_BANNER 53 /* 0x35 */ |
93 | #define SSH2_MSG_USERAUTH_PK_OK 60 /* 0x3c */ |
94 | #define SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ 60 /* 0x3c */ |
95 | #define SSH2_MSG_GLOBAL_REQUEST 80 /* 0x50 */ |
96 | #define SSH2_MSG_REQUEST_SUCCESS 81 /* 0x51 */ |
97 | #define SSH2_MSG_REQUEST_FAILURE 82 /* 0x52 */ |
98 | #define SSH2_MSG_CHANNEL_OPEN 90 /* 0x5a */ |
99 | #define SSH2_MSG_CHANNEL_OPEN_CONFIRMATION 91 /* 0x5b */ |
100 | #define SSH2_MSG_CHANNEL_OPEN_FAILURE 92 /* 0x5c */ |
101 | #define SSH2_MSG_CHANNEL_WINDOW_ADJUST 93 /* 0x5d */ |
102 | #define SSH2_MSG_CHANNEL_DATA 94 /* 0x5e */ |
103 | #define SSH2_MSG_CHANNEL_EXTENDED_DATA 95 /* 0x5f */ |
104 | #define SSH2_MSG_CHANNEL_EOF 96 /* 0x60 */ |
105 | #define SSH2_MSG_CHANNEL_CLOSE 97 /* 0x61 */ |
106 | #define SSH2_MSG_CHANNEL_REQUEST 98 /* 0x62 */ |
107 | #define SSH2_MSG_CHANNEL_SUCCESS 99 /* 0x63 */ |
108 | #define SSH2_MSG_CHANNEL_FAILURE 100 /* 0x64 */ |
109 | |
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110 | #define SSH2_DISCONNECT_HOST_NOT_ALLOWED_TO_CONNECT 1 /* 0x1 */ |
111 | #define SSH2_DISCONNECT_PROTOCOL_ERROR 2 /* 0x2 */ |
112 | #define SSH2_DISCONNECT_KEY_EXCHANGE_FAILED 3 /* 0x3 */ |
113 | #define SSH2_DISCONNECT_HOST_AUTHENTICATION_FAILED 4 /* 0x4 */ |
114 | #define SSH2_DISCONNECT_MAC_ERROR 5 /* 0x5 */ |
115 | #define SSH2_DISCONNECT_COMPRESSION_ERROR 6 /* 0x6 */ |
116 | #define SSH2_DISCONNECT_SERVICE_NOT_AVAILABLE 7 /* 0x7 */ |
117 | #define SSH2_DISCONNECT_PROTOCOL_VERSION_NOT_SUPPORTED 8 /* 0x8 */ |
118 | #define SSH2_DISCONNECT_HOST_KEY_NOT_VERIFIABLE 9 /* 0x9 */ |
119 | #define SSH2_DISCONNECT_CONNECTION_LOST 10 /* 0xa */ |
120 | #define SSH2_DISCONNECT_BY_APPLICATION 11 /* 0xb */ |
121 | |
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122 | #define SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED 1 /* 0x1 */ |
123 | #define SSH2_OPEN_CONNECT_FAILED 2 /* 0x2 */ |
124 | #define SSH2_OPEN_UNKNOWN_CHANNEL_TYPE 3 /* 0x3 */ |
125 | #define SSH2_OPEN_RESOURCE_SHORTAGE 4 /* 0x4 */ |
126 | |
127 | #define SSH2_EXTENDED_DATA_STDERR 1 /* 0x1 */ |
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128 | |
129 | #define GET_32BIT(cp) \ |
130 | (((unsigned long)(unsigned char)(cp)[0] << 24) | \ |
131 | ((unsigned long)(unsigned char)(cp)[1] << 16) | \ |
132 | ((unsigned long)(unsigned char)(cp)[2] << 8) | \ |
133 | ((unsigned long)(unsigned char)(cp)[3])) |
134 | |
135 | #define PUT_32BIT(cp, value) { \ |
136 | (cp)[0] = (unsigned char)((value) >> 24); \ |
137 | (cp)[1] = (unsigned char)((value) >> 16); \ |
138 | (cp)[2] = (unsigned char)((value) >> 8); \ |
139 | (cp)[3] = (unsigned char)(value); } |
140 | |
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141 | enum { PKT_END, PKT_INT, PKT_CHAR, PKT_DATA, PKT_STR, PKT_BIGNUM }; |
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142 | |
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143 | /* Coroutine mechanics for the sillier bits of the code */ |
144 | #define crBegin1 static int crLine = 0; |
145 | #define crBegin2 switch(crLine) { case 0:; |
146 | #define crBegin crBegin1; crBegin2; |
147 | #define crFinish(z) } crLine = 0; return (z) |
148 | #define crFinishV } crLine = 0; return |
149 | #define crReturn(z) \ |
150 | do {\ |
151 | crLine=__LINE__; return (z); case __LINE__:;\ |
152 | } while (0) |
153 | #define crReturnV \ |
154 | do {\ |
155 | crLine=__LINE__; return; case __LINE__:;\ |
156 | } while (0) |
157 | #define crStop(z) do{ crLine = 0; return (z); }while(0) |
158 | #define crStopV do{ crLine = 0; return; }while(0) |
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159 | #define crWaitUntil(c) do { crReturn(0); } while (!(c)) |
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160 | #define crWaitUntilV(c) do { crReturnV; } while (!(c)) |
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161 | |
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162 | extern const struct ssh_cipher ssh_3des; |
163 | extern const struct ssh_cipher ssh_3des_ssh2; |
164 | extern const struct ssh_cipher ssh_des; |
165 | extern const struct ssh_cipher ssh_blowfish_ssh1; |
166 | extern const struct ssh_cipher ssh_blowfish_ssh2; |
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167 | |
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168 | extern char *x11_init (Socket *, char *, void *, char **); |
169 | extern void x11_close (Socket); |
170 | extern void x11_send (Socket , char *, int); |
171 | extern void x11_invent_auth(char *, int, char *, int); |
172 | |
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173 | /* |
174 | * Ciphers for SSH2. We miss out single-DES because it isn't |
175 | * supported; also 3DES and Blowfish are both done differently from |
176 | * SSH1. (3DES uses outer chaining; Blowfish has the opposite |
177 | * endianness and different-sized keys.) |
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178 | */ |
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179 | const static struct ssh_cipher *ciphers[] = { &ssh_blowfish_ssh2, &ssh_3des_ssh2 }; |
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180 | |
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181 | extern const struct ssh_kex ssh_diffiehellman; |
182 | const static struct ssh_kex *kex_algs[] = { &ssh_diffiehellman }; |
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183 | |
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184 | extern const struct ssh_signkey ssh_dss; |
185 | const static struct ssh_signkey *hostkey_algs[] = { &ssh_dss }; |
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186 | |
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187 | extern const struct ssh_mac ssh_md5, ssh_sha1, ssh_sha1_buggy; |
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188 | |
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189 | static void nullmac_key(unsigned char *key) { } |
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190 | static void nullmac_generate(unsigned char *blk, int len, unsigned long seq) { } |
191 | static int nullmac_verify(unsigned char *blk, int len, unsigned long seq) { return 1; } |
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192 | const static struct ssh_mac ssh_mac_none = { |
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193 | nullmac_key, nullmac_key, nullmac_generate, nullmac_verify, "none", 0 |
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194 | }; |
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195 | const static struct ssh_mac *macs[] = { |
196 | &ssh_sha1, &ssh_md5, &ssh_mac_none }; |
197 | const static struct ssh_mac *buggymacs[] = { |
198 | &ssh_sha1_buggy, &ssh_md5, &ssh_mac_none }; |
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199 | |
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200 | static void ssh_comp_none_init(void) { } |
201 | static int ssh_comp_none_block(unsigned char *block, int len, |
202 | unsigned char **outblock, int *outlen) { |
203 | return 0; |
204 | } |
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205 | const static struct ssh_compress ssh_comp_none = { |
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206 | "none", |
207 | ssh_comp_none_init, ssh_comp_none_block, |
208 | ssh_comp_none_init, ssh_comp_none_block |
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209 | }; |
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210 | extern const struct ssh_compress ssh_zlib; |
211 | const static struct ssh_compress *compressions[] = { |
212 | &ssh_zlib, &ssh_comp_none }; |
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213 | |
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214 | enum { /* channel types */ |
215 | CHAN_MAINSESSION, |
216 | CHAN_X11, |
217 | CHAN_AGENT, |
218 | }; |
219 | |
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220 | /* |
221 | * 2-3-4 tree storing channels. |
222 | */ |
223 | struct ssh_channel { |
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224 | unsigned remoteid, localid; |
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225 | int type; |
226 | int closes; |
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227 | struct ssh2_data_channel { |
228 | unsigned char *outbuffer; |
229 | unsigned outbuflen, outbufsize; |
230 | unsigned remwindow, remmaxpkt; |
231 | } v2; |
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232 | union { |
233 | struct ssh_agent_channel { |
234 | unsigned char *message; |
235 | unsigned char msglen[4]; |
236 | int lensofar, totallen; |
237 | } a; |
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238 | struct ssh_x11_channel { |
239 | Socket s; |
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240 | } x11; |
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241 | } u; |
242 | }; |
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243 | |
244 | struct Packet { |
245 | long length; |
246 | int type; |
247 | unsigned char *data; |
248 | unsigned char *body; |
249 | long savedpos; |
250 | long maxlen; |
251 | }; |
252 | |
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253 | static SHA_State exhash, exhashbase; |
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254 | |
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255 | static Socket s = NULL; |
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256 | |
257 | static unsigned char session_key[32]; |
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258 | static int ssh1_compressing; |
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259 | static int ssh_agentfwd_enabled; |
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260 | static int ssh_X11_fwd_enabled; |
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261 | static const struct ssh_cipher *cipher = NULL; |
262 | static const struct ssh_cipher *cscipher = NULL; |
263 | static const struct ssh_cipher *sccipher = NULL; |
264 | static const struct ssh_mac *csmac = NULL; |
265 | static const struct ssh_mac *scmac = NULL; |
266 | static const struct ssh_compress *cscomp = NULL; |
267 | static const struct ssh_compress *sccomp = NULL; |
268 | static const struct ssh_kex *kex = NULL; |
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269 | static const struct ssh_signkey *hostkey = NULL; |
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270 | int (*ssh_get_password)(const char *prompt, char *str, int maxlen) = NULL; |
271 | |
272 | static char *savedhost; |
273 | static int savedport; |
274 | static int ssh_send_ok; |
275 | |
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276 | static tree234 *ssh_channels; /* indexed by local id */ |
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277 | static struct ssh_channel *mainchan; /* primary session channel */ |
278 | |
279 | static enum { |
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280 | SSH_STATE_PREPACKET, |
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281 | SSH_STATE_BEFORE_SIZE, |
282 | SSH_STATE_INTERMED, |
283 | SSH_STATE_SESSION, |
284 | SSH_STATE_CLOSED |
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285 | } ssh_state = SSH_STATE_PREPACKET; |
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286 | |
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287 | static int size_needed = FALSE, eof_needed = FALSE; |
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288 | |
289 | static struct Packet pktin = { 0, 0, NULL, NULL, 0 }; |
290 | static struct Packet pktout = { 0, 0, NULL, NULL, 0 }; |
291 | |
292 | static int ssh_version; |
293 | static void (*ssh_protocol)(unsigned char *in, int inlen, int ispkt); |
294 | static void ssh1_protocol(unsigned char *in, int inlen, int ispkt); |
295 | static void ssh2_protocol(unsigned char *in, int inlen, int ispkt); |
296 | static void ssh_size(void); |
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297 | static void ssh_special (Telnet_Special); |
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298 | static void ssh2_try_send(struct ssh_channel *c); |
299 | static void ssh2_add_channel_data(struct ssh_channel *c, char *buf, int len); |
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300 | |
301 | static int (*s_rdpkt)(unsigned char **data, int *datalen); |
302 | |
303 | static struct rdpkt1_state_tag { |
304 | long len, pad, biglen, to_read; |
305 | unsigned long realcrc, gotcrc; |
306 | unsigned char *p; |
307 | int i; |
308 | int chunk; |
309 | } rdpkt1_state; |
310 | |
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311 | static struct rdpkt2_state_tag { |
312 | long len, pad, payload, packetlen, maclen; |
313 | int i; |
314 | int cipherblk; |
315 | unsigned long incoming_sequence; |
316 | } rdpkt2_state; |
317 | |
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318 | static int ssh_channelcmp(void *av, void *bv) { |
319 | struct ssh_channel *a = (struct ssh_channel *)av; |
320 | struct ssh_channel *b = (struct ssh_channel *)bv; |
321 | if (a->localid < b->localid) return -1; |
322 | if (a->localid > b->localid) return +1; |
323 | return 0; |
324 | } |
325 | static int ssh_channelfind(void *av, void *bv) { |
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326 | unsigned *a = (unsigned *)av; |
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327 | struct ssh_channel *b = (struct ssh_channel *)bv; |
328 | if (*a < b->localid) return -1; |
329 | if (*a > b->localid) return +1; |
330 | return 0; |
331 | } |
332 | |
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333 | static void c_write (char *buf, int len) { |
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334 | if ((flags & FLAG_STDERR)) { |
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335 | int i; |
336 | for (i = 0; i < len; i++) |
337 | if (buf[i] != '\r') |
338 | fputc(buf[i], stderr); |
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339 | return; |
340 | } |
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341 | from_backend(1, buf, len); |
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342 | } |
343 | |
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344 | /* |
345 | * Collect incoming data in the incoming packet buffer. |
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346 | * Decipher and verify the packet when it is completely read. |
347 | * Drop SSH1_MSG_DEBUG and SSH1_MSG_IGNORE packets. |
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348 | * Update the *data and *datalen variables. |
349 | * Return the additional nr of bytes needed, or 0 when |
350 | * a complete packet is available. |
351 | */ |
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352 | static int ssh1_rdpkt(unsigned char **data, int *datalen) |
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353 | { |
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354 | struct rdpkt1_state_tag *st = &rdpkt1_state; |
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355 | |
356 | crBegin; |
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357 | |
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358 | next_packet: |
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359 | |
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360 | pktin.type = 0; |
361 | pktin.length = 0; |
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362 | |
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363 | for (st->i = st->len = 0; st->i < 4; st->i++) { |
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364 | while ((*datalen) == 0) |
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365 | crReturn(4-st->i); |
366 | st->len = (st->len << 8) + **data; |
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367 | (*data)++, (*datalen)--; |
368 | } |
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369 | |
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370 | #ifdef FWHACK |
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371 | if (st->len == 0x52656d6f) { /* "Remo"te server has closed ... */ |
372 | st->len = 0x300; /* big enough to carry to end */ |
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373 | } |
374 | #endif |
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375 | |
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376 | st->pad = 8 - (st->len % 8); |
377 | st->biglen = st->len + st->pad; |
378 | pktin.length = st->len - 5; |
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379 | |
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380 | if (pktin.maxlen < st->biglen) { |
381 | pktin.maxlen = st->biglen; |
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382 | pktin.data = (pktin.data == NULL ? smalloc(st->biglen+APIEXTRA) : |
383 | srealloc(pktin.data, st->biglen+APIEXTRA)); |
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384 | if (!pktin.data) |
385 | fatalbox("Out of memory"); |
386 | } |
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387 | |
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388 | st->to_read = st->biglen; |
389 | st->p = pktin.data; |
390 | while (st->to_read > 0) { |
391 | st->chunk = st->to_read; |
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392 | while ((*datalen) == 0) |
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393 | crReturn(st->to_read); |
394 | if (st->chunk > (*datalen)) |
395 | st->chunk = (*datalen); |
396 | memcpy(st->p, *data, st->chunk); |
397 | *data += st->chunk; |
398 | *datalen -= st->chunk; |
399 | st->p += st->chunk; |
400 | st->to_read -= st->chunk; |
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401 | } |
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402 | |
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403 | if (cipher) |
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404 | cipher->decrypt(pktin.data, st->biglen); |
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405 | #if 0 |
406 | debug(("Got packet len=%d pad=%d\r\n", st->len, st->pad)); |
407 | for (st->i = 0; st->i < st->biglen; st->i++) |
408 | debug((" %02x", (unsigned char)pktin.data[st->i])); |
409 | debug(("\r\n")); |
410 | #endif |
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411 | |
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412 | st->realcrc = crc32(pktin.data, st->biglen-4); |
413 | st->gotcrc = GET_32BIT(pktin.data+st->biglen-4); |
414 | if (st->gotcrc != st->realcrc) { |
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415 | bombout(("Incorrect CRC received on packet")); |
416 | crReturn(0); |
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417 | } |
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418 | |
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419 | pktin.body = pktin.data + st->pad + 1; |
420 | |
421 | if (ssh1_compressing) { |
422 | unsigned char *decompblk; |
423 | int decomplen; |
424 | #if 0 |
425 | int i; |
426 | debug(("Packet payload pre-decompression:\n")); |
427 | for (i = -1; i < pktin.length; i++) |
428 | debug((" %02x", (unsigned char)pktin.body[i])); |
429 | debug(("\r\n")); |
430 | #endif |
431 | zlib_decompress_block(pktin.body-1, pktin.length+1, |
432 | &decompblk, &decomplen); |
433 | |
434 | if (pktin.maxlen < st->pad + decomplen) { |
435 | pktin.maxlen = st->pad + decomplen; |
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436 | pktin.data = srealloc(pktin.data, pktin.maxlen+APIEXTRA); |
58298665 |
437 | pktin.body = pktin.data + st->pad + 1; |
4ba9b64b |
438 | if (!pktin.data) |
439 | fatalbox("Out of memory"); |
440 | } |
441 | |
442 | memcpy(pktin.body-1, decompblk, decomplen); |
dcbde236 |
443 | sfree(decompblk); |
4ba9b64b |
444 | pktin.length = decomplen-1; |
445 | #if 0 |
446 | debug(("Packet payload post-decompression:\n")); |
447 | for (i = -1; i < pktin.length; i++) |
448 | debug((" %02x", (unsigned char)pktin.body[i])); |
449 | debug(("\r\n")); |
450 | #endif |
451 | } |
452 | |
e5574168 |
453 | if (pktin.type == SSH1_SMSG_STDOUT_DATA || |
454 | pktin.type == SSH1_SMSG_STDERR_DATA || |
455 | pktin.type == SSH1_MSG_DEBUG || |
18515c51 |
456 | pktin.type == SSH1_SMSG_AUTH_TIS_CHALLENGE || |
457 | pktin.type == SSH1_SMSG_AUTH_CCARD_CHALLENGE) { |
fb09bf1c |
458 | long strlen = GET_32BIT(pktin.body); |
8d5de777 |
459 | if (strlen + 4 != pktin.length) { |
460 | bombout(("Received data packet with bogus string length")); |
461 | crReturn(0); |
462 | } |
fb09bf1c |
463 | } |
464 | |
4ba9b64b |
465 | pktin.type = pktin.body[-1]; |
466 | |
e5574168 |
467 | if (pktin.type == SSH1_MSG_DEBUG) { |
fb09bf1c |
468 | /* log debug message */ |
469 | char buf[80]; |
470 | int strlen = GET_32BIT(pktin.body); |
471 | strcpy(buf, "Remote: "); |
472 | if (strlen > 70) strlen = 70; |
473 | memcpy(buf+8, pktin.body+4, strlen); |
474 | buf[8+strlen] = '\0'; |
475 | logevent(buf); |
476 | goto next_packet; |
e5574168 |
477 | } else if (pktin.type == SSH1_MSG_IGNORE) { |
fb09bf1c |
478 | /* do nothing */ |
479 | goto next_packet; |
480 | } |
481 | |
482 | crFinish(0); |
483 | } |
484 | |
e5574168 |
485 | static int ssh2_rdpkt(unsigned char **data, int *datalen) |
486 | { |
960e736a |
487 | struct rdpkt2_state_tag *st = &rdpkt2_state; |
e5574168 |
488 | |
489 | crBegin; |
490 | |
491 | next_packet: |
e5574168 |
492 | pktin.type = 0; |
493 | pktin.length = 0; |
960e736a |
494 | if (sccipher) |
495 | st->cipherblk = sccipher->blksize; |
e5574168 |
496 | else |
960e736a |
497 | st->cipherblk = 8; |
498 | if (st->cipherblk < 8) |
499 | st->cipherblk = 8; |
500 | |
501 | if (pktin.maxlen < st->cipherblk) { |
502 | pktin.maxlen = st->cipherblk; |
dcbde236 |
503 | pktin.data = (pktin.data == NULL ? smalloc(st->cipherblk+APIEXTRA) : |
504 | srealloc(pktin.data, st->cipherblk+APIEXTRA)); |
e5574168 |
505 | if (!pktin.data) |
506 | fatalbox("Out of memory"); |
507 | } |
508 | |
509 | /* |
510 | * Acquire and decrypt the first block of the packet. This will |
511 | * contain the length and padding details. |
512 | */ |
960e736a |
513 | for (st->i = st->len = 0; st->i < st->cipherblk; st->i++) { |
e5574168 |
514 | while ((*datalen) == 0) |
960e736a |
515 | crReturn(st->cipherblk-st->i); |
516 | pktin.data[st->i] = *(*data)++; |
e5574168 |
517 | (*datalen)--; |
518 | } |
519 | #ifdef FWHACK |
520 | if (!memcmp(pktin.data, "Remo", 4)) {/* "Remo"te server has closed ... */ |
521 | /* FIXME */ |
522 | } |
523 | #endif |
524 | if (sccipher) |
960e736a |
525 | sccipher->decrypt(pktin.data, st->cipherblk); |
e5574168 |
526 | |
527 | /* |
528 | * Now get the length and padding figures. |
529 | */ |
960e736a |
530 | st->len = GET_32BIT(pktin.data); |
531 | st->pad = pktin.data[4]; |
e5574168 |
532 | |
533 | /* |
534 | * This enables us to deduce the payload length. |
535 | */ |
960e736a |
536 | st->payload = st->len - st->pad - 1; |
e5574168 |
537 | |
960e736a |
538 | pktin.length = st->payload + 5; |
e5574168 |
539 | |
540 | /* |
541 | * So now we can work out the total packet length. |
542 | */ |
960e736a |
543 | st->packetlen = st->len + 4; |
544 | st->maclen = scmac ? scmac->len : 0; |
e5574168 |
545 | |
546 | /* |
547 | * Adjust memory allocation if packet is too big. |
548 | */ |
960e736a |
549 | if (pktin.maxlen < st->packetlen+st->maclen) { |
550 | pktin.maxlen = st->packetlen+st->maclen; |
dcbde236 |
551 | pktin.data = (pktin.data == NULL ? smalloc(pktin.maxlen+APIEXTRA) : |
552 | srealloc(pktin.data, pktin.maxlen+APIEXTRA)); |
e5574168 |
553 | if (!pktin.data) |
554 | fatalbox("Out of memory"); |
555 | } |
556 | |
557 | /* |
558 | * Read and decrypt the remainder of the packet. |
559 | */ |
960e736a |
560 | for (st->i = st->cipherblk; st->i < st->packetlen + st->maclen; st->i++) { |
e5574168 |
561 | while ((*datalen) == 0) |
960e736a |
562 | crReturn(st->packetlen + st->maclen - st->i); |
563 | pktin.data[st->i] = *(*data)++; |
e5574168 |
564 | (*datalen)--; |
565 | } |
566 | /* Decrypt everything _except_ the MAC. */ |
567 | if (sccipher) |
960e736a |
568 | sccipher->decrypt(pktin.data + st->cipherblk, |
569 | st->packetlen - st->cipherblk); |
e5574168 |
570 | |
7cca0d81 |
571 | #if 0 |
960e736a |
572 | debug(("Got packet len=%d pad=%d\r\n", st->len, st->pad)); |
573 | for (st->i = 0; st->i < st->packetlen; st->i++) |
574 | debug((" %02x", (unsigned char)pktin.data[st->i])); |
d39f364a |
575 | debug(("\r\n")); |
7cca0d81 |
576 | #endif |
d39f364a |
577 | |
e5574168 |
578 | /* |
579 | * Check the MAC. |
580 | */ |
960e736a |
581 | if (scmac && !scmac->verify(pktin.data, st->len+4, st->incoming_sequence)) { |
8d5de777 |
582 | bombout(("Incorrect MAC received on packet")); |
583 | crReturn(0); |
584 | } |
960e736a |
585 | st->incoming_sequence++; /* whether or not we MACed */ |
e5574168 |
586 | |
4ba9b64b |
587 | /* |
588 | * Decompress packet payload. |
589 | */ |
590 | { |
591 | unsigned char *newpayload; |
592 | int newlen; |
593 | if (sccomp && sccomp->decompress(pktin.data+5, pktin.length-5, |
594 | &newpayload, &newlen)) { |
595 | if (pktin.maxlen < newlen+5) { |
596 | pktin.maxlen = newlen+5; |
dcbde236 |
597 | pktin.data = (pktin.data == NULL ? smalloc(pktin.maxlen+APIEXTRA) : |
598 | srealloc(pktin.data, pktin.maxlen+APIEXTRA)); |
4ba9b64b |
599 | if (!pktin.data) |
600 | fatalbox("Out of memory"); |
601 | } |
602 | pktin.length = 5 + newlen; |
603 | memcpy(pktin.data+5, newpayload, newlen); |
604 | #if 0 |
605 | debug(("Post-decompression payload:\r\n")); |
606 | for (st->i = 0; st->i < newlen; st->i++) |
607 | debug((" %02x", (unsigned char)pktin.data[5+st->i])); |
608 | debug(("\r\n")); |
609 | #endif |
610 | |
dcbde236 |
611 | sfree(newpayload); |
4ba9b64b |
612 | } |
613 | } |
614 | |
e5574168 |
615 | pktin.savedpos = 6; |
616 | pktin.type = pktin.data[5]; |
e5574168 |
617 | |
7cca0d81 |
618 | if (pktin.type == SSH2_MSG_IGNORE || pktin.type == SSH2_MSG_DEBUG) |
619 | goto next_packet; /* FIXME: print DEBUG message */ |
e5574168 |
620 | |
621 | crFinish(0); |
622 | } |
623 | |
4ba9b64b |
624 | static void ssh1_pktout_size(int len) { |
374330e2 |
625 | int pad, biglen; |
626 | |
627 | len += 5; /* type and CRC */ |
628 | pad = 8 - (len%8); |
629 | biglen = len + pad; |
630 | |
631 | pktout.length = len-5; |
632 | if (pktout.maxlen < biglen) { |
633 | pktout.maxlen = biglen; |
8f203108 |
634 | #ifdef MSCRYPTOAPI |
fb09bf1c |
635 | /* Allocate enough buffer space for extra block |
8f203108 |
636 | * for MS CryptEncrypt() */ |
dcbde236 |
637 | pktout.data = (pktout.data == NULL ? smalloc(biglen+12) : |
638 | srealloc(pktout.data, biglen+12)); |
8f203108 |
639 | #else |
dcbde236 |
640 | pktout.data = (pktout.data == NULL ? smalloc(biglen+4) : |
641 | srealloc(pktout.data, biglen+4)); |
8f203108 |
642 | #endif |
374330e2 |
643 | if (!pktout.data) |
644 | fatalbox("Out of memory"); |
645 | } |
4ba9b64b |
646 | pktout.body = pktout.data+4+pad+1; |
647 | } |
374330e2 |
648 | |
4ba9b64b |
649 | static void s_wrpkt_start(int type, int len) { |
650 | ssh1_pktout_size(len); |
374330e2 |
651 | pktout.type = type; |
374330e2 |
652 | } |
653 | |
654 | static void s_wrpkt(void) { |
655 | int pad, len, biglen, i; |
656 | unsigned long crc; |
657 | |
4ba9b64b |
658 | pktout.body[-1] = pktout.type; |
659 | |
660 | if (ssh1_compressing) { |
661 | unsigned char *compblk; |
662 | int complen; |
663 | #if 0 |
664 | debug(("Packet payload pre-compression:\n")); |
665 | for (i = -1; i < pktout.length; i++) |
666 | debug((" %02x", (unsigned char)pktout.body[i])); |
667 | debug(("\r\n")); |
668 | #endif |
669 | zlib_compress_block(pktout.body-1, pktout.length+1, |
670 | &compblk, &complen); |
671 | ssh1_pktout_size(complen-1); |
672 | memcpy(pktout.body-1, compblk, complen); |
dcbde236 |
673 | sfree(compblk); |
4ba9b64b |
674 | #if 0 |
675 | debug(("Packet payload post-compression:\n")); |
676 | for (i = -1; i < pktout.length; i++) |
677 | debug((" %02x", (unsigned char)pktout.body[i])); |
678 | debug(("\r\n")); |
679 | #endif |
680 | } |
681 | |
374330e2 |
682 | len = pktout.length + 5; /* type and CRC */ |
683 | pad = 8 - (len%8); |
684 | biglen = len + pad; |
685 | |
374330e2 |
686 | for (i=0; i<pad; i++) |
687 | pktout.data[i+4] = random_byte(); |
688 | crc = crc32(pktout.data+4, biglen-4); |
fb09bf1c |
689 | PUT_32BIT(pktout.data+biglen, crc); |
690 | PUT_32BIT(pktout.data, len); |
374330e2 |
691 | |
698a5108 |
692 | #if 0 |
693 | debug(("Sending packet len=%d\r\n", biglen+4)); |
694 | for (i = 0; i < biglen+4; i++) |
695 | debug((" %02x", (unsigned char)pktout.data[i])); |
696 | debug(("\r\n")); |
697 | #endif |
374330e2 |
698 | if (cipher) |
699 | cipher->encrypt(pktout.data+4, biglen); |
700 | |
8df7a775 |
701 | sk_write(s, pktout.data, biglen+4); |
374330e2 |
702 | } |
703 | |
fb09bf1c |
704 | /* |
705 | * Construct a packet with the specified contents and |
706 | * send it to the server. |
707 | */ |
708 | static void send_packet(int pkttype, ...) |
709 | { |
710 | va_list args; |
711 | unsigned char *p, *argp, argchar; |
712 | unsigned long argint; |
713 | int pktlen, argtype, arglen; |
7cca0d81 |
714 | Bignum bn; |
fb09bf1c |
715 | |
716 | pktlen = 0; |
717 | va_start(args, pkttype); |
718 | while ((argtype = va_arg(args, int)) != PKT_END) { |
719 | switch (argtype) { |
720 | case PKT_INT: |
721 | (void) va_arg(args, int); |
722 | pktlen += 4; |
723 | break; |
724 | case PKT_CHAR: |
725 | (void) va_arg(args, char); |
726 | pktlen++; |
727 | break; |
728 | case PKT_DATA: |
729 | (void) va_arg(args, unsigned char *); |
730 | arglen = va_arg(args, int); |
731 | pktlen += arglen; |
732 | break; |
733 | case PKT_STR: |
734 | argp = va_arg(args, unsigned char *); |
735 | arglen = strlen(argp); |
736 | pktlen += 4 + arglen; |
737 | break; |
7cca0d81 |
738 | case PKT_BIGNUM: |
739 | bn = va_arg(args, Bignum); |
5c58ad2d |
740 | pktlen += ssh1_bignum_length(bn); |
7cca0d81 |
741 | break; |
fb09bf1c |
742 | default: |
743 | assert(0); |
744 | } |
745 | } |
746 | va_end(args); |
747 | |
748 | s_wrpkt_start(pkttype, pktlen); |
749 | p = pktout.body; |
750 | |
751 | va_start(args, pkttype); |
752 | while ((argtype = va_arg(args, int)) != PKT_END) { |
753 | switch (argtype) { |
754 | case PKT_INT: |
755 | argint = va_arg(args, int); |
756 | PUT_32BIT(p, argint); |
757 | p += 4; |
758 | break; |
759 | case PKT_CHAR: |
760 | argchar = va_arg(args, unsigned char); |
761 | *p = argchar; |
762 | p++; |
763 | break; |
764 | case PKT_DATA: |
765 | argp = va_arg(args, unsigned char *); |
766 | arglen = va_arg(args, int); |
767 | memcpy(p, argp, arglen); |
768 | p += arglen; |
769 | break; |
770 | case PKT_STR: |
771 | argp = va_arg(args, unsigned char *); |
772 | arglen = strlen(argp); |
773 | PUT_32BIT(p, arglen); |
774 | memcpy(p + 4, argp, arglen); |
775 | p += 4 + arglen; |
776 | break; |
7cca0d81 |
777 | case PKT_BIGNUM: |
778 | bn = va_arg(args, Bignum); |
5c58ad2d |
779 | p += ssh1_write_bignum(p, bn); |
7cca0d81 |
780 | break; |
fb09bf1c |
781 | } |
782 | } |
783 | va_end(args); |
784 | |
785 | s_wrpkt(); |
786 | } |
787 | |
9697bfd2 |
788 | static int ssh_versioncmp(char *a, char *b) { |
789 | char *ae, *be; |
790 | unsigned long av, bv; |
791 | |
43aa02a7 |
792 | av = strtoul(a, &ae, 10); |
793 | bv = strtoul(b, &be, 10); |
9697bfd2 |
794 | if (av != bv) return (av < bv ? -1 : +1); |
795 | if (*ae == '.') ae++; |
796 | if (*be == '.') be++; |
43aa02a7 |
797 | av = strtoul(ae, &ae, 10); |
798 | bv = strtoul(be, &be, 10); |
9697bfd2 |
799 | if (av != bv) return (av < bv ? -1 : +1); |
800 | return 0; |
801 | } |
802 | |
e5574168 |
803 | |
804 | /* |
805 | * Utility routine for putting an SSH-protocol `string' into a SHA |
806 | * state. |
807 | */ |
808 | #include <stdio.h> |
75cab814 |
809 | static void sha_string(SHA_State *s, void *str, int len) { |
e5574168 |
810 | unsigned char lenblk[4]; |
e5574168 |
811 | PUT_32BIT(lenblk, len); |
e5574168 |
812 | SHA_Bytes(s, lenblk, 4); |
e5574168 |
813 | SHA_Bytes(s, str, len); |
814 | } |
815 | |
7cca0d81 |
816 | /* |
817 | * SSH2 packet construction functions. |
818 | */ |
783415f8 |
819 | static void ssh2_pkt_ensure(int length) { |
820 | if (pktout.maxlen < length) { |
821 | pktout.maxlen = length + 256; |
dcbde236 |
822 | pktout.data = (pktout.data == NULL ? smalloc(pktout.maxlen+APIEXTRA) : |
823 | srealloc(pktout.data, pktout.maxlen+APIEXTRA)); |
7cca0d81 |
824 | if (!pktout.data) |
825 | fatalbox("Out of memory"); |
826 | } |
783415f8 |
827 | } |
828 | static void ssh2_pkt_adddata(void *data, int len) { |
829 | pktout.length += len; |
830 | ssh2_pkt_ensure(pktout.length); |
7cca0d81 |
831 | memcpy(pktout.data+pktout.length-len, data, len); |
832 | } |
75cab814 |
833 | static void ssh2_pkt_addbyte(unsigned char byte) { |
7cca0d81 |
834 | ssh2_pkt_adddata(&byte, 1); |
835 | } |
75cab814 |
836 | static void ssh2_pkt_init(int pkt_type) { |
7cca0d81 |
837 | pktout.length = 5; |
838 | ssh2_pkt_addbyte((unsigned char)pkt_type); |
839 | } |
75cab814 |
840 | static void ssh2_pkt_addbool(unsigned char value) { |
7cca0d81 |
841 | ssh2_pkt_adddata(&value, 1); |
842 | } |
75cab814 |
843 | static void ssh2_pkt_adduint32(unsigned long value) { |
7cca0d81 |
844 | unsigned char x[4]; |
845 | PUT_32BIT(x, value); |
846 | ssh2_pkt_adddata(x, 4); |
847 | } |
75cab814 |
848 | static void ssh2_pkt_addstring_start(void) { |
7cca0d81 |
849 | ssh2_pkt_adduint32(0); |
850 | pktout.savedpos = pktout.length; |
851 | } |
75cab814 |
852 | static void ssh2_pkt_addstring_str(char *data) { |
7cca0d81 |
853 | ssh2_pkt_adddata(data, strlen(data)); |
854 | PUT_32BIT(pktout.data + pktout.savedpos - 4, |
855 | pktout.length - pktout.savedpos); |
856 | } |
75cab814 |
857 | static void ssh2_pkt_addstring_data(char *data, int len) { |
7cca0d81 |
858 | ssh2_pkt_adddata(data, len); |
859 | PUT_32BIT(pktout.data + pktout.savedpos - 4, |
860 | pktout.length - pktout.savedpos); |
861 | } |
75cab814 |
862 | static void ssh2_pkt_addstring(char *data) { |
7cca0d81 |
863 | ssh2_pkt_addstring_start(); |
864 | ssh2_pkt_addstring_str(data); |
865 | } |
75cab814 |
866 | static char *ssh2_mpint_fmt(Bignum b, int *len) { |
7cca0d81 |
867 | unsigned char *p; |
868 | int i, n = b[0]; |
dcbde236 |
869 | p = smalloc(n * 2 + 1); |
7cca0d81 |
870 | if (!p) |
871 | fatalbox("out of memory"); |
872 | p[0] = 0; |
873 | for (i = 0; i < n; i++) { |
874 | p[i*2+1] = (b[n-i] >> 8) & 0xFF; |
875 | p[i*2+2] = (b[n-i] ) & 0xFF; |
876 | } |
877 | i = 0; |
878 | while (p[i] == 0 && (p[i+1] & 0x80) == 0) |
879 | i++; |
880 | memmove(p, p+i, n*2+1-i); |
881 | *len = n*2+1-i; |
882 | return p; |
883 | } |
75cab814 |
884 | static void ssh2_pkt_addmp(Bignum b) { |
7cca0d81 |
885 | unsigned char *p; |
886 | int len; |
887 | p = ssh2_mpint_fmt(b, &len); |
888 | ssh2_pkt_addstring_start(); |
889 | ssh2_pkt_addstring_data(p, len); |
dcbde236 |
890 | sfree(p); |
7cca0d81 |
891 | } |
75cab814 |
892 | static void ssh2_pkt_send(void) { |
7cca0d81 |
893 | int cipherblk, maclen, padding, i; |
894 | static unsigned long outgoing_sequence = 0; |
895 | |
896 | /* |
4ba9b64b |
897 | * Compress packet payload. |
898 | */ |
899 | #if 0 |
900 | debug(("Pre-compression payload:\r\n")); |
901 | for (i = 5; i < pktout.length; i++) |
902 | debug((" %02x", (unsigned char)pktout.data[i])); |
903 | debug(("\r\n")); |
904 | #endif |
905 | { |
906 | unsigned char *newpayload; |
907 | int newlen; |
908 | if (cscomp && cscomp->compress(pktout.data+5, pktout.length-5, |
909 | &newpayload, &newlen)) { |
910 | pktout.length = 5; |
911 | ssh2_pkt_adddata(newpayload, newlen); |
dcbde236 |
912 | sfree(newpayload); |
4ba9b64b |
913 | } |
914 | } |
915 | |
916 | /* |
7cca0d81 |
917 | * Add padding. At least four bytes, and must also bring total |
918 | * length (minus MAC) up to a multiple of the block size. |
919 | */ |
920 | cipherblk = cipher ? cipher->blksize : 8; /* block size */ |
921 | cipherblk = cipherblk < 8 ? 8 : cipherblk; /* or 8 if blksize < 8 */ |
922 | padding = 4; |
923 | padding += (cipherblk - (pktout.length + padding) % cipherblk) % cipherblk; |
783415f8 |
924 | maclen = csmac ? csmac->len : 0; |
925 | ssh2_pkt_ensure(pktout.length + padding + maclen); |
7cca0d81 |
926 | pktout.data[4] = padding; |
927 | for (i = 0; i < padding; i++) |
928 | pktout.data[pktout.length + i] = random_byte(); |
929 | PUT_32BIT(pktout.data, pktout.length + padding - 4); |
930 | if (csmac) |
931 | csmac->generate(pktout.data, pktout.length + padding, |
932 | outgoing_sequence); |
933 | outgoing_sequence++; /* whether or not we MACed */ |
934 | |
935 | #if 0 |
936 | debug(("Sending packet len=%d\r\n", pktout.length+padding)); |
937 | for (i = 0; i < pktout.length+padding; i++) |
938 | debug((" %02x", (unsigned char)pktout.data[i])); |
939 | debug(("\r\n")); |
940 | #endif |
941 | |
942 | if (cscipher) |
943 | cscipher->encrypt(pktout.data, pktout.length + padding); |
7cca0d81 |
944 | |
8df7a775 |
945 | sk_write(s, pktout.data, pktout.length + padding + maclen); |
7cca0d81 |
946 | } |
947 | |
948 | #if 0 |
949 | void bndebug(char *string, Bignum b) { |
950 | unsigned char *p; |
951 | int i, len; |
952 | p = ssh2_mpint_fmt(b, &len); |
953 | debug(("%s", string)); |
954 | for (i = 0; i < len; i++) |
955 | debug((" %02x", p[i])); |
956 | debug(("\r\n")); |
dcbde236 |
957 | sfree(p); |
7cca0d81 |
958 | } |
959 | #endif |
960 | |
75cab814 |
961 | static void sha_mpint(SHA_State *s, Bignum b) { |
7cca0d81 |
962 | unsigned char *p; |
963 | int len; |
964 | p = ssh2_mpint_fmt(b, &len); |
965 | sha_string(s, p, len); |
dcbde236 |
966 | sfree(p); |
7cca0d81 |
967 | } |
968 | |
969 | /* |
970 | * SSH2 packet decode functions. |
971 | */ |
75cab814 |
972 | static unsigned long ssh2_pkt_getuint32(void) { |
7cca0d81 |
973 | unsigned long value; |
974 | if (pktin.length - pktin.savedpos < 4) |
975 | return 0; /* arrgh, no way to decline (FIXME?) */ |
976 | value = GET_32BIT(pktin.data+pktin.savedpos); |
977 | pktin.savedpos += 4; |
978 | return value; |
979 | } |
75cab814 |
980 | static void ssh2_pkt_getstring(char **p, int *length) { |
7cca0d81 |
981 | *p = NULL; |
982 | if (pktin.length - pktin.savedpos < 4) |
983 | return; |
984 | *length = GET_32BIT(pktin.data+pktin.savedpos); |
985 | pktin.savedpos += 4; |
986 | if (pktin.length - pktin.savedpos < *length) |
987 | return; |
988 | *p = pktin.data+pktin.savedpos; |
989 | pktin.savedpos += *length; |
990 | } |
75cab814 |
991 | static Bignum ssh2_pkt_getmp(void) { |
7cca0d81 |
992 | char *p; |
993 | int i, j, length; |
994 | Bignum b; |
995 | |
996 | ssh2_pkt_getstring(&p, &length); |
997 | if (!p) |
998 | return NULL; |
8d5de777 |
999 | if (p[0] & 0x80) { |
1000 | bombout(("internal error: Can't handle negative mpints")); |
1001 | return NULL; |
1002 | } |
7cca0d81 |
1003 | b = newbn((length+1)/2); |
1004 | for (i = 0; i < length; i++) { |
1005 | j = length - 1 - i; |
1006 | if (j & 1) |
1007 | b[j/2+1] |= ((unsigned char)p[i]) << 8; |
1008 | else |
1009 | b[j/2+1] |= ((unsigned char)p[i]); |
1010 | } |
6b4e00ee |
1011 | while (b[0] > 1 && b[b[0]] == 0) b[0]--; |
7cca0d81 |
1012 | return b; |
1013 | } |
1014 | |
8df7a775 |
1015 | static int do_ssh_init(unsigned char c) { |
1016 | static char *vsp; |
1017 | static char version[10]; |
1018 | static char vstring[80]; |
1019 | static char vlog[sizeof(vstring)+20]; |
1020 | static int i; |
374330e2 |
1021 | |
8df7a775 |
1022 | crBegin; |
1023 | |
1024 | /* Search for the string "SSH-" in the input. */ |
374330e2 |
1025 | i = 0; |
8df7a775 |
1026 | while (1) { |
1027 | static const int transS[] = { 1, 2, 2, 1 }; |
1028 | static const int transH[] = { 0, 0, 3, 0 }; |
1029 | static const int transminus[] = { 0, 0, 0, -1 }; |
1030 | if (c == 'S') i = transS[i]; |
1031 | else if (c == 'H') i = transH[i]; |
1032 | else if (c == '-') i = transminus[i]; |
374330e2 |
1033 | else i = 0; |
8df7a775 |
1034 | if (i < 0) |
1035 | break; |
1036 | crReturn(1); /* get another character */ |
374330e2 |
1037 | } |
8df7a775 |
1038 | |
c5e9c988 |
1039 | strcpy(vstring, "SSH-"); |
1040 | vsp = vstring+4; |
374330e2 |
1041 | i = 0; |
1042 | while (1) { |
8df7a775 |
1043 | crReturn(1); /* get another char */ |
c5e9c988 |
1044 | if (vsp < vstring+sizeof(vstring)-1) |
1045 | *vsp++ = c; |
374330e2 |
1046 | if (i >= 0) { |
1047 | if (c == '-') { |
1048 | version[i] = '\0'; |
1049 | i = -1; |
1050 | } else if (i < sizeof(version)-1) |
1051 | version[i++] = c; |
1052 | } |
1053 | else if (c == '\n') |
1054 | break; |
1055 | } |
1056 | |
db7d555c |
1057 | ssh_agentfwd_enabled = FALSE; |
960e736a |
1058 | rdpkt2_state.incoming_sequence = 0; |
1059 | |
c5e9c988 |
1060 | *vsp = 0; |
1061 | sprintf(vlog, "Server version: %s", vstring); |
1062 | vlog[strcspn(vlog, "\r\n")] = '\0'; |
1063 | logevent(vlog); |
1064 | |
adf799dd |
1065 | /* |
1066 | * Server version "1.99" means we can choose whether we use v1 |
1067 | * or v2 protocol. Choice is based on cfg.sshprot. |
1068 | */ |
1069 | if (ssh_versioncmp(version, cfg.sshprot == 1 ? "2.0" : "1.99") >= 0) { |
e5574168 |
1070 | /* |
1071 | * This is a v2 server. Begin v2 protocol. |
1072 | */ |
1073 | char *verstring = "SSH-2.0-PuTTY"; |
0db56f73 |
1074 | SHA_Init(&exhashbase); |
e5574168 |
1075 | /* |
1076 | * Hash our version string and their version string. |
1077 | */ |
0db56f73 |
1078 | sha_string(&exhashbase, verstring, strlen(verstring)); |
1079 | sha_string(&exhashbase, vstring, strcspn(vstring, "\r\n")); |
e5574168 |
1080 | sprintf(vstring, "%s\n", verstring); |
1081 | sprintf(vlog, "We claim version: %s", verstring); |
1082 | logevent(vlog); |
1083 | logevent("Using SSH protocol version 2"); |
8df7a775 |
1084 | sk_write(s, vstring, strlen(vstring)); |
e5574168 |
1085 | ssh_protocol = ssh2_protocol; |
6abbf9e3 |
1086 | ssh_version = 2; |
e5574168 |
1087 | s_rdpkt = ssh2_rdpkt; |
1088 | } else { |
1089 | /* |
1090 | * This is a v1 server. Begin v1 protocol. |
1091 | */ |
1092 | sprintf(vstring, "SSH-%s-PuTTY\n", |
1093 | (ssh_versioncmp(version, "1.5") <= 0 ? version : "1.5")); |
1094 | sprintf(vlog, "We claim version: %s", vstring); |
1095 | vlog[strcspn(vlog, "\r\n")] = '\0'; |
1096 | logevent(vlog); |
1097 | logevent("Using SSH protocol version 1"); |
8df7a775 |
1098 | sk_write(s, vstring, strlen(vstring)); |
e5574168 |
1099 | ssh_protocol = ssh1_protocol; |
6abbf9e3 |
1100 | ssh_version = 1; |
e5574168 |
1101 | s_rdpkt = ssh1_rdpkt; |
1102 | } |
3687d221 |
1103 | ssh_state = SSH_STATE_BEFORE_SIZE; |
8df7a775 |
1104 | |
1105 | crFinish(0); |
1106 | } |
1107 | |
1108 | static void ssh_gotdata(unsigned char *data, int datalen) |
1109 | { |
1110 | crBegin; |
1111 | |
1112 | /* |
1113 | * To begin with, feed the characters one by one to the |
1114 | * protocol initialisation / selection function do_ssh_init(). |
1115 | * When that returns 0, we're done with the initial greeting |
1116 | * exchange and can move on to packet discipline. |
1117 | */ |
1118 | while (1) { |
1119 | int ret; |
1120 | if (datalen == 0) |
1121 | crReturnV; /* more data please */ |
1122 | ret = do_ssh_init(*data); |
1123 | data++; datalen--; |
1124 | if (ret == 0) |
1125 | break; |
1126 | } |
1127 | |
1128 | /* |
1129 | * We emerge from that loop when the initial negotiation is |
1130 | * over and we have selected an s_rdpkt function. Now pass |
1131 | * everything to s_rdpkt, and then pass the resulting packets |
1132 | * to the proper protocol handler. |
1133 | */ |
1134 | if (datalen == 0) |
1135 | crReturnV; |
1136 | while (1) { |
1137 | while (datalen > 0) { |
1138 | if ( s_rdpkt(&data, &datalen) == 0 ) { |
1139 | ssh_protocol(NULL, 0, 1); |
1140 | if (ssh_state == SSH_STATE_CLOSED) { |
1141 | return; |
1142 | } |
1143 | } |
1144 | } |
1145 | crReturnV; |
1146 | } |
1147 | crFinishV; |
1148 | } |
1149 | |
340cf649 |
1150 | static int ssh_receive(Socket skt, int urgent, char *data, int len) { |
8df7a775 |
1151 | if (!len) { |
1152 | /* Connection has closed. */ |
6abb6cd7 |
1153 | ssh_state = SSH_STATE_CLOSED; |
8df7a775 |
1154 | sk_close(s); |
1155 | s = NULL; |
1156 | return 0; |
1157 | } |
1158 | ssh_gotdata (data, len); |
3257deae |
1159 | if (ssh_state == SSH_STATE_CLOSED) { |
1160 | if (s) { |
1161 | sk_close(s); |
1162 | s = NULL; |
1163 | } |
1164 | return 0; |
1165 | } |
fef97f43 |
1166 | return 1; |
374330e2 |
1167 | } |
1168 | |
fb09bf1c |
1169 | /* |
8df7a775 |
1170 | * Connect to specified host and port. |
1171 | * Returns an error message, or NULL on success. |
1172 | * Also places the canonical host name into `realhost'. |
1173 | */ |
1174 | static char *connect_to_host(char *host, int port, char **realhost) |
1175 | { |
1176 | SockAddr addr; |
1177 | char *err; |
1178 | #ifdef FWHACK |
1179 | char *FWhost; |
1180 | int FWport; |
1181 | #endif |
1182 | |
dcbde236 |
1183 | savedhost = smalloc(1+strlen(host)); |
8df7a775 |
1184 | if (!savedhost) |
1185 | fatalbox("Out of memory"); |
1186 | strcpy(savedhost, host); |
1187 | |
1188 | if (port < 0) |
1189 | port = 22; /* default ssh port */ |
1190 | savedport = port; |
1191 | |
1192 | #ifdef FWHACK |
1193 | FWhost = host; |
1194 | FWport = port; |
1195 | host = FWSTR; |
1196 | port = 23; |
1197 | #endif |
1198 | |
1199 | /* |
1200 | * Try to find host. |
1201 | */ |
1202 | addr = sk_namelookup(host, realhost); |
1203 | if ( (err = sk_addr_error(addr)) ) |
1204 | return err; |
1205 | |
1206 | #ifdef FWHACK |
1207 | *realhost = FWhost; |
1208 | #endif |
1209 | |
1210 | /* |
1211 | * Open socket. |
1212 | */ |
c91409da |
1213 | s = sk_new(addr, port, 0, ssh_receive); |
8df7a775 |
1214 | if ( (err = sk_socket_error(s)) ) |
1215 | return err; |
1216 | |
1217 | #ifdef FWHACK |
1218 | sk_write(s, "connect ", 8); |
1219 | sk_write(s, FWhost, strlen(FWhost)); |
1220 | { |
1221 | char buf[20]; |
1222 | sprintf(buf, " %d\n", FWport); |
1223 | sk_write(s, buf, strlen(buf)); |
1224 | } |
1225 | #endif |
1226 | |
1227 | return NULL; |
1228 | } |
1229 | |
1230 | /* |
fb09bf1c |
1231 | * Handle the key exchange and user authentication phases. |
1232 | */ |
e5574168 |
1233 | static int do_ssh1_login(unsigned char *in, int inlen, int ispkt) |
fb09bf1c |
1234 | { |
374330e2 |
1235 | int i, j, len; |
374330e2 |
1236 | unsigned char *rsabuf, *keystr1, *keystr2; |
1237 | unsigned char cookie[8]; |
1238 | struct RSAKey servkey, hostkey; |
1239 | struct MD5Context md5c; |
ccbfb941 |
1240 | static unsigned long supported_ciphers_mask, supported_auths_mask; |
7cca0d81 |
1241 | static int tried_publickey; |
1242 | static unsigned char session_id[16]; |
bea1ef5f |
1243 | int cipher_type; |
b585ec46 |
1244 | static char username[100]; |
374330e2 |
1245 | |
374330e2 |
1246 | crBegin; |
1247 | |
fb09bf1c |
1248 | if (!ispkt) crWaitUntil(ispkt); |
374330e2 |
1249 | |
8d5de777 |
1250 | if (pktin.type != SSH1_SMSG_PUBLIC_KEY) { |
1251 | bombout(("Public key packet not received")); |
1252 | crReturn(0); |
1253 | } |
374330e2 |
1254 | |
c5e9c988 |
1255 | logevent("Received public keys"); |
374330e2 |
1256 | |
c5e9c988 |
1257 | memcpy(cookie, pktin.body, 8); |
374330e2 |
1258 | |
7cca0d81 |
1259 | i = makekey(pktin.body+8, &servkey, &keystr1, 0); |
1260 | j = makekey(pktin.body+8+i, &hostkey, &keystr2, 0); |
374330e2 |
1261 | |
c5e9c988 |
1262 | /* |
1c2a93c4 |
1263 | * Log the host key fingerprint. |
c5e9c988 |
1264 | */ |
c5e9c988 |
1265 | { |
1266 | char logmsg[80]; |
1c2a93c4 |
1267 | logevent("Host key fingerprint is:"); |
c5e9c988 |
1268 | strcpy(logmsg, " "); |
1c2a93c4 |
1269 | hostkey.comment = NULL; |
1270 | rsa_fingerprint(logmsg+strlen(logmsg), sizeof(logmsg)-strlen(logmsg), |
1271 | &hostkey); |
c5e9c988 |
1272 | logevent(logmsg); |
1273 | } |
1274 | |
fb09bf1c |
1275 | supported_ciphers_mask = GET_32BIT(pktin.body+12+i+j); |
1276 | supported_auths_mask = GET_32BIT(pktin.body+16+i+j); |
bea1ef5f |
1277 | |
c5e9c988 |
1278 | MD5Init(&md5c); |
374330e2 |
1279 | MD5Update(&md5c, keystr2, hostkey.bytes); |
1280 | MD5Update(&md5c, keystr1, servkey.bytes); |
1281 | MD5Update(&md5c, pktin.body, 8); |
374330e2 |
1282 | MD5Final(session_id, &md5c); |
1283 | |
1284 | for (i=0; i<32; i++) |
1285 | session_key[i] = random_byte(); |
1286 | |
1287 | len = (hostkey.bytes > servkey.bytes ? hostkey.bytes : servkey.bytes); |
1288 | |
dcbde236 |
1289 | rsabuf = smalloc(len); |
374330e2 |
1290 | if (!rsabuf) |
1291 | fatalbox("Out of memory"); |
1292 | |
89ee5268 |
1293 | /* |
1294 | * Verify the host key. |
1295 | */ |
1296 | { |
1297 | /* |
1298 | * First format the key into a string. |
1299 | */ |
1300 | int len = rsastr_len(&hostkey); |
d5859615 |
1301 | char fingerprint[100]; |
dcbde236 |
1302 | char *keystr = smalloc(len); |
89ee5268 |
1303 | if (!keystr) |
1304 | fatalbox("Out of memory"); |
1305 | rsastr_fmt(keystr, &hostkey); |
d5859615 |
1306 | rsa_fingerprint(fingerprint, sizeof(fingerprint), &hostkey); |
d4857987 |
1307 | verify_ssh_host_key(savedhost, savedport, "rsa", keystr, fingerprint); |
dcbde236 |
1308 | sfree(keystr); |
89ee5268 |
1309 | } |
374330e2 |
1310 | |
1311 | for (i=0; i<32; i++) { |
1312 | rsabuf[i] = session_key[i]; |
1313 | if (i < 16) |
1314 | rsabuf[i] ^= session_id[i]; |
1315 | } |
1316 | |
1317 | if (hostkey.bytes > servkey.bytes) { |
1318 | rsaencrypt(rsabuf, 32, &servkey); |
1319 | rsaencrypt(rsabuf, servkey.bytes, &hostkey); |
1320 | } else { |
1321 | rsaencrypt(rsabuf, 32, &hostkey); |
1322 | rsaencrypt(rsabuf, hostkey.bytes, &servkey); |
1323 | } |
1324 | |
c5e9c988 |
1325 | logevent("Encrypted session key"); |
1326 | |
bea1ef5f |
1327 | cipher_type = cfg.cipher == CIPHER_BLOWFISH ? SSH_CIPHER_BLOWFISH : |
9697bfd2 |
1328 | cfg.cipher == CIPHER_DES ? SSH_CIPHER_DES : |
bea1ef5f |
1329 | SSH_CIPHER_3DES; |
1330 | if ((supported_ciphers_mask & (1 << cipher_type)) == 0) { |
1331 | c_write("Selected cipher not supported, falling back to 3DES\r\n", 53); |
1332 | cipher_type = SSH_CIPHER_3DES; |
1333 | } |
c5e9c988 |
1334 | switch (cipher_type) { |
1335 | case SSH_CIPHER_3DES: logevent("Using 3DES encryption"); break; |
1336 | case SSH_CIPHER_DES: logevent("Using single-DES encryption"); break; |
1337 | case SSH_CIPHER_BLOWFISH: logevent("Using Blowfish encryption"); break; |
1338 | } |
bea1ef5f |
1339 | |
e5574168 |
1340 | send_packet(SSH1_CMSG_SESSION_KEY, |
fb09bf1c |
1341 | PKT_CHAR, cipher_type, |
1342 | PKT_DATA, cookie, 8, |
1343 | PKT_CHAR, (len*8) >> 8, PKT_CHAR, (len*8) & 0xFF, |
1344 | PKT_DATA, rsabuf, len, |
1345 | PKT_INT, 0, |
1346 | PKT_END); |
1347 | |
c5e9c988 |
1348 | logevent("Trying to enable encryption..."); |
374330e2 |
1349 | |
dcbde236 |
1350 | sfree(rsabuf); |
374330e2 |
1351 | |
5e8358ad |
1352 | cipher = cipher_type == SSH_CIPHER_BLOWFISH ? &ssh_blowfish_ssh1 : |
9697bfd2 |
1353 | cipher_type == SSH_CIPHER_DES ? &ssh_des : |
bea1ef5f |
1354 | &ssh_3des; |
374330e2 |
1355 | cipher->sesskey(session_key); |
1356 | |
fb09bf1c |
1357 | crWaitUntil(ispkt); |
374330e2 |
1358 | |
8d5de777 |
1359 | if (pktin.type != SSH1_SMSG_SUCCESS) { |
1360 | bombout(("Encryption not successfully enabled")); |
1361 | crReturn(0); |
1362 | } |
374330e2 |
1363 | |
c5e9c988 |
1364 | logevent("Successfully started encryption"); |
1365 | |
374330e2 |
1366 | fflush(stdout); |
1367 | { |
374330e2 |
1368 | static int pos = 0; |
1369 | static char c; |
67779be7 |
1370 | if ((flags & FLAG_INTERACTIVE) && !*cfg.username) { |
374330e2 |
1371 | c_write("login as: ", 10); |
67779be7 |
1372 | ssh_send_ok = 1; |
374330e2 |
1373 | while (pos >= 0) { |
fb09bf1c |
1374 | crWaitUntil(!ispkt); |
374330e2 |
1375 | while (inlen--) switch (c = *in++) { |
1376 | case 10: case 13: |
1377 | username[pos] = 0; |
1378 | pos = -1; |
1379 | break; |
1380 | case 8: case 127: |
1381 | if (pos > 0) { |
1382 | c_write("\b \b", 3); |
1383 | pos--; |
1384 | } |
1385 | break; |
1386 | case 21: case 27: |
1387 | while (pos > 0) { |
1388 | c_write("\b \b", 3); |
1389 | pos--; |
1390 | } |
1391 | break; |
1392 | case 3: case 4: |
1393 | random_save_seed(); |
1394 | exit(0); |
1395 | break; |
1396 | default: |
40d24aa6 |
1397 | if (((c >= ' ' && c <= '~') || |
1398 | ((unsigned char)c >= 160)) && pos < 40) { |
374330e2 |
1399 | username[pos++] = c; |
1400 | c_write(&c, 1); |
1401 | } |
1402 | break; |
1403 | } |
1404 | } |
1405 | c_write("\r\n", 2); |
1406 | username[strcspn(username, "\n\r")] = '\0'; |
1407 | } else { |
374330e2 |
1408 | strncpy(username, cfg.username, 99); |
1409 | username[99] = '\0'; |
374330e2 |
1410 | } |
fb09bf1c |
1411 | |
e5574168 |
1412 | send_packet(SSH1_CMSG_USER, PKT_STR, username, PKT_END); |
c5e9c988 |
1413 | { |
3c8e959b |
1414 | char userlog[22+sizeof(username)]; |
c5e9c988 |
1415 | sprintf(userlog, "Sent username \"%s\"", username); |
1416 | logevent(userlog); |
3c8e959b |
1417 | if (flags & FLAG_INTERACTIVE && |
1418 | (!((flags & FLAG_STDERR) && (flags & FLAG_VERBOSE)))) { |
1419 | strcat(userlog, "\r\n"); |
1420 | c_write(userlog, strlen(userlog)); |
1421 | } |
c5e9c988 |
1422 | } |
374330e2 |
1423 | } |
1424 | |
fb09bf1c |
1425 | crWaitUntil(ispkt); |
374330e2 |
1426 | |
7cca0d81 |
1427 | tried_publickey = 0; |
1428 | |
e5574168 |
1429 | while (pktin.type == SSH1_SMSG_FAILURE) { |
374330e2 |
1430 | static char password[100]; |
a52f067e |
1431 | static char prompt[200]; |
374330e2 |
1432 | static int pos; |
1433 | static char c; |
ccbfb941 |
1434 | static int pwpkt_type; |
ccbfb941 |
1435 | /* |
1436 | * Show password prompt, having first obtained it via a TIS |
18515c51 |
1437 | * or CryptoCard exchange if we're doing TIS or CryptoCard |
1438 | * authentication. |
ccbfb941 |
1439 | */ |
e5574168 |
1440 | pwpkt_type = SSH1_CMSG_AUTH_PASSWORD; |
5c58ad2d |
1441 | if (agent_exists()) { |
1442 | /* |
1443 | * Attempt RSA authentication using Pageant. |
1444 | */ |
1445 | static unsigned char request[5], *response, *p; |
1446 | static int responselen; |
1447 | static int i, nkeys; |
1448 | static int authed = FALSE; |
1449 | void *r; |
1450 | |
1451 | logevent("Pageant is running. Requesting keys."); |
1452 | |
1453 | /* Request the keys held by the agent. */ |
1454 | PUT_32BIT(request, 1); |
1455 | request[4] = SSH_AGENTC_REQUEST_RSA_IDENTITIES; |
1456 | agent_query(request, 5, &r, &responselen); |
1457 | response = (unsigned char *)r; |
1458 | if (response) { |
1459 | p = response + 5; |
1460 | nkeys = GET_32BIT(p); p += 4; |
1461 | { char buf[64]; sprintf(buf, "Pageant has %d keys", nkeys); |
1462 | logevent(buf); } |
1463 | for (i = 0; i < nkeys; i++) { |
1464 | static struct RSAKey key; |
1465 | static Bignum challenge; |
b8bb811a |
1466 | static char *commentp; |
1467 | static int commentlen; |
5c58ad2d |
1468 | |
1469 | { char buf[64]; sprintf(buf, "Trying Pageant key #%d", i); |
1470 | logevent(buf); } |
1471 | p += 4; |
1472 | p += ssh1_read_bignum(p, &key.exponent); |
1473 | p += ssh1_read_bignum(p, &key.modulus); |
b8bb811a |
1474 | commentlen = GET_32BIT(p); p += 4; |
1475 | commentp = p; p += commentlen; |
5c58ad2d |
1476 | send_packet(SSH1_CMSG_AUTH_RSA, |
1477 | PKT_BIGNUM, key.modulus, PKT_END); |
1478 | crWaitUntil(ispkt); |
1479 | if (pktin.type != SSH1_SMSG_AUTH_RSA_CHALLENGE) { |
1480 | logevent("Key refused"); |
1481 | continue; |
1482 | } |
1483 | logevent("Received RSA challenge"); |
1484 | ssh1_read_bignum(pktin.body, &challenge); |
1485 | { |
1486 | char *agentreq, *q, *ret; |
1487 | int len, retlen; |
1488 | len = 1 + 4; /* message type, bit count */ |
1489 | len += ssh1_bignum_length(key.exponent); |
1490 | len += ssh1_bignum_length(key.modulus); |
1491 | len += ssh1_bignum_length(challenge); |
1492 | len += 16; /* session id */ |
1493 | len += 4; /* response format */ |
dcbde236 |
1494 | agentreq = smalloc(4 + len); |
5c58ad2d |
1495 | PUT_32BIT(agentreq, len); |
1496 | q = agentreq + 4; |
1497 | *q++ = SSH_AGENTC_RSA_CHALLENGE; |
1498 | PUT_32BIT(q, ssh1_bignum_bitcount(key.modulus)); |
1499 | q += 4; |
1500 | q += ssh1_write_bignum(q, key.exponent); |
1501 | q += ssh1_write_bignum(q, key.modulus); |
1502 | q += ssh1_write_bignum(q, challenge); |
1503 | memcpy(q, session_id, 16); q += 16; |
1504 | PUT_32BIT(q, 1); /* response format */ |
1505 | agent_query(agentreq, len+4, &ret, &retlen); |
dcbde236 |
1506 | sfree(agentreq); |
5c58ad2d |
1507 | if (ret) { |
1508 | if (ret[4] == SSH_AGENT_RSA_RESPONSE) { |
1509 | logevent("Sending Pageant's response"); |
1510 | send_packet(SSH1_CMSG_AUTH_RSA_RESPONSE, |
1511 | PKT_DATA, ret+5, 16, PKT_END); |
dcbde236 |
1512 | sfree(ret); |
5c58ad2d |
1513 | crWaitUntil(ispkt); |
1514 | if (pktin.type == SSH1_SMSG_SUCCESS) { |
1515 | logevent("Pageant's response accepted"); |
c4fa2fce |
1516 | if (flags & FLAG_VERBOSE) { |
1517 | c_write("Authenticated using RSA key \"", |
1518 | 29); |
1519 | c_write(commentp, commentlen); |
1520 | c_write("\" from agent\r\n", 14); |
1521 | } |
5c58ad2d |
1522 | authed = TRUE; |
1523 | } else |
1524 | logevent("Pageant's response not accepted"); |
1525 | } else { |
1526 | logevent("Pageant failed to answer challenge"); |
dcbde236 |
1527 | sfree(ret); |
5c58ad2d |
1528 | } |
1529 | } else { |
1530 | logevent("No reply received from Pageant"); |
1531 | } |
1532 | } |
1533 | freebn(key.exponent); |
1534 | freebn(key.modulus); |
1535 | freebn(challenge); |
1536 | if (authed) |
1537 | break; |
1538 | } |
1539 | } |
1540 | if (authed) |
1541 | break; |
1542 | } |
7cca0d81 |
1543 | if (*cfg.keyfile && !tried_publickey) |
1544 | pwpkt_type = SSH1_CMSG_AUTH_RSA; |
fb09bf1c |
1545 | |
a52f067e |
1546 | if (pktin.type == SSH1_SMSG_FAILURE && |
1547 | cfg.try_tis_auth && |
1548 | (supported_auths_mask & (1<<SSH1_AUTH_TIS))) { |
1549 | pwpkt_type = SSH1_CMSG_AUTH_TIS_RESPONSE; |
1550 | logevent("Requested TIS authentication"); |
1551 | send_packet(SSH1_CMSG_AUTH_TIS, PKT_END); |
1552 | crWaitUntil(ispkt); |
1553 | if (pktin.type != SSH1_SMSG_AUTH_TIS_CHALLENGE) { |
1554 | logevent("TIS authentication declined"); |
1555 | if (flags & FLAG_INTERACTIVE) |
1556 | c_write("TIS authentication refused.\r\n", 29); |
1557 | } else { |
1558 | int challengelen = ((pktin.body[0] << 24) | |
1559 | (pktin.body[1] << 16) | |
1560 | (pktin.body[2] << 8) | |
1561 | (pktin.body[3])); |
1562 | logevent("Received TIS challenge"); |
1563 | if (challengelen > sizeof(prompt)-1) |
1564 | challengelen = sizeof(prompt)-1; /* prevent overrun */ |
1565 | memcpy(prompt, pktin.body+4, challengelen); |
1566 | prompt[challengelen] = '\0'; |
1567 | } |
1568 | } |
1569 | if (pktin.type == SSH1_SMSG_FAILURE && |
1570 | cfg.try_tis_auth && |
1571 | (supported_auths_mask & (1<<SSH1_AUTH_CCARD))) { |
1572 | pwpkt_type = SSH1_CMSG_AUTH_CCARD_RESPONSE; |
1573 | logevent("Requested CryptoCard authentication"); |
1574 | send_packet(SSH1_CMSG_AUTH_CCARD, PKT_END); |
1575 | crWaitUntil(ispkt); |
1576 | if (pktin.type != SSH1_SMSG_AUTH_CCARD_CHALLENGE) { |
1577 | logevent("CryptoCard authentication declined"); |
1578 | c_write("CryptoCard authentication refused.\r\n", 29); |
1579 | } else { |
1580 | int challengelen = ((pktin.body[0] << 24) | |
1581 | (pktin.body[1] << 16) | |
1582 | (pktin.body[2] << 8) | |
1583 | (pktin.body[3])); |
1584 | logevent("Received CryptoCard challenge"); |
1585 | if (challengelen > sizeof(prompt)-1) |
1586 | challengelen = sizeof(prompt)-1; /* prevent overrun */ |
1587 | memcpy(prompt, pktin.body+4, challengelen); |
1588 | strncpy(prompt + challengelen, "\r\nResponse : ", |
1589 | sizeof(prompt)-challengelen); |
1590 | prompt[sizeof(prompt)-1] = '\0'; |
1591 | } |
1592 | } |
1593 | if (pwpkt_type == SSH1_CMSG_AUTH_PASSWORD) { |
1594 | sprintf(prompt, "%.90s@%.90s's password: ", |
b585ec46 |
1595 | username, savedhost); |
a52f067e |
1596 | } |
1597 | if (pwpkt_type == SSH1_CMSG_AUTH_RSA) { |
1598 | char *comment = NULL; |
1599 | if (flags & FLAG_VERBOSE) |
1600 | c_write("Trying public key authentication.\r\n", 35); |
1601 | if (!rsakey_encrypted(cfg.keyfile, &comment)) { |
1602 | if (flags & FLAG_VERBOSE) |
1603 | c_write("No passphrase required.\r\n", 25); |
1604 | goto tryauth; |
1605 | } |
1606 | sprintf(prompt, "Passphrase for key \"%.100s\": ", comment); |
dcbde236 |
1607 | sfree(comment); |
a52f067e |
1608 | } |
1609 | |
d8426c54 |
1610 | if (ssh_get_password) { |
85ee8208 |
1611 | if (!ssh_get_password(prompt, password, sizeof(password))) { |
1612 | /* |
1613 | * get_password failed to get a password (for |
1614 | * example because one was supplied on the command |
1615 | * line which has already failed to work). |
1616 | * Terminate. |
1617 | */ |
1618 | logevent("No more passwords to try"); |
1619 | ssh_state = SSH_STATE_CLOSED; |
1620 | crReturn(1); |
1621 | } |
fb09bf1c |
1622 | } else { |
a52f067e |
1623 | c_write(prompt, strlen(prompt)); |
7cca0d81 |
1624 | pos = 0; |
67779be7 |
1625 | ssh_send_ok = 1; |
7cca0d81 |
1626 | while (pos >= 0) { |
1627 | crWaitUntil(!ispkt); |
1628 | while (inlen--) switch (c = *in++) { |
1629 | case 10: case 13: |
1630 | password[pos] = 0; |
1631 | pos = -1; |
1632 | break; |
1633 | case 8: case 127: |
1634 | if (pos > 0) |
1635 | pos--; |
1636 | break; |
1637 | case 21: case 27: |
1638 | pos = 0; |
1639 | break; |
1640 | case 3: case 4: |
1641 | random_save_seed(); |
1642 | exit(0); |
1643 | break; |
1644 | default: |
1645 | if (((c >= ' ' && c <= '~') || |
1646 | ((unsigned char)c >= 160)) && pos < sizeof(password)) |
1647 | password[pos++] = c; |
1648 | break; |
1649 | } |
1650 | } |
1651 | c_write("\r\n", 2); |
a52f067e |
1652 | } |
fb09bf1c |
1653 | |
7cca0d81 |
1654 | tryauth: |
1655 | if (pwpkt_type == SSH1_CMSG_AUTH_RSA) { |
1656 | /* |
1657 | * Try public key authentication with the specified |
1658 | * key file. |
1659 | */ |
1660 | static struct RSAKey pubkey; |
1661 | static Bignum challenge, response; |
1662 | static int i; |
1663 | static unsigned char buffer[32]; |
1664 | |
1665 | tried_publickey = 1; |
6e522441 |
1666 | i = loadrsakey(cfg.keyfile, &pubkey, NULL, password); |
7cca0d81 |
1667 | if (i == 0) { |
1668 | c_write("Couldn't load public key from ", 30); |
1669 | c_write(cfg.keyfile, strlen(cfg.keyfile)); |
1670 | c_write(".\r\n", 3); |
1671 | continue; /* go and try password */ |
1672 | } |
1673 | if (i == -1) { |
1674 | c_write("Wrong passphrase.\r\n", 19); |
1675 | tried_publickey = 0; |
1676 | continue; /* try again */ |
1677 | } |
1678 | |
1679 | /* |
1680 | * Send a public key attempt. |
1681 | */ |
1682 | send_packet(SSH1_CMSG_AUTH_RSA, |
1683 | PKT_BIGNUM, pubkey.modulus, PKT_END); |
1684 | |
1685 | crWaitUntil(ispkt); |
1686 | if (pktin.type == SSH1_SMSG_FAILURE) { |
a52f067e |
1687 | c_write("Server refused our public key.\r\n", 32); |
7cca0d81 |
1688 | continue; /* go and try password */ |
1689 | } |
8d5de777 |
1690 | if (pktin.type != SSH1_SMSG_AUTH_RSA_CHALLENGE) { |
1691 | bombout(("Bizarre response to offer of public key")); |
1692 | crReturn(0); |
1693 | } |
7cca0d81 |
1694 | ssh1_read_bignum(pktin.body, &challenge); |
1695 | response = rsadecrypt(challenge, &pubkey); |
1696 | freebn(pubkey.private_exponent); /* burn the evidence */ |
1697 | |
1698 | for (i = 0; i < 32; i += 2) { |
1699 | buffer[i] = response[16-i/2] >> 8; |
1700 | buffer[i+1] = response[16-i/2] & 0xFF; |
1701 | } |
1702 | |
1703 | MD5Init(&md5c); |
1704 | MD5Update(&md5c, buffer, 32); |
1705 | MD5Update(&md5c, session_id, 16); |
1706 | MD5Final(buffer, &md5c); |
1707 | |
1708 | send_packet(SSH1_CMSG_AUTH_RSA_RESPONSE, |
1709 | PKT_DATA, buffer, 16, PKT_END); |
1710 | |
1711 | crWaitUntil(ispkt); |
1712 | if (pktin.type == SSH1_SMSG_FAILURE) { |
4017be6d |
1713 | if (flags & FLAG_VERBOSE) |
1714 | c_write("Failed to authenticate with our public key.\r\n", |
1715 | 45); |
7cca0d81 |
1716 | continue; /* go and try password */ |
1717 | } else if (pktin.type != SSH1_SMSG_SUCCESS) { |
8d5de777 |
1718 | bombout(("Bizarre response to RSA authentication response")); |
1719 | crReturn(0); |
7cca0d81 |
1720 | } |
1721 | |
1722 | break; /* we're through! */ |
1723 | } else { |
1724 | send_packet(pwpkt_type, PKT_STR, password, PKT_END); |
1725 | } |
c5e9c988 |
1726 | logevent("Sent password"); |
374330e2 |
1727 | memset(password, 0, strlen(password)); |
fb09bf1c |
1728 | crWaitUntil(ispkt); |
e5574168 |
1729 | if (pktin.type == SSH1_SMSG_FAILURE) { |
4017be6d |
1730 | if (flags & FLAG_VERBOSE) |
1731 | c_write("Access denied\r\n", 15); |
c5e9c988 |
1732 | logevent("Authentication refused"); |
e5574168 |
1733 | } else if (pktin.type == SSH1_MSG_DISCONNECT) { |
fb09bf1c |
1734 | logevent("Received disconnect request"); |
85ee8208 |
1735 | ssh_state = SSH_STATE_CLOSED; |
1736 | crReturn(1); |
e5574168 |
1737 | } else if (pktin.type != SSH1_SMSG_SUCCESS) { |
8d5de777 |
1738 | bombout(("Strange packet received, type %d", pktin.type)); |
1739 | crReturn(0); |
374330e2 |
1740 | } |
1741 | } |
1742 | |
c5e9c988 |
1743 | logevent("Authentication successful"); |
1744 | |
fb09bf1c |
1745 | crFinish(1); |
1746 | } |
1747 | |
9c964e85 |
1748 | void sshfwd_close(struct ssh_channel *c) { |
783415f8 |
1749 | if (c) { |
1750 | if (ssh_version == 1) { |
1751 | send_packet(SSH1_MSG_CHANNEL_CLOSE, PKT_INT, c->remoteid, PKT_END); |
1752 | } else { |
1753 | ssh2_pkt_init(SSH2_MSG_CHANNEL_CLOSE); |
1754 | ssh2_pkt_adduint32(c->remoteid); |
1755 | ssh2_pkt_send(); |
1756 | } |
1757 | c->closes = 1; |
1758 | if (c->type == CHAN_X11) { |
1759 | c->u.x11.s = NULL; |
1760 | logevent("X11 connection terminated"); |
1761 | } |
1762 | } |
9c964e85 |
1763 | } |
1764 | |
1765 | void sshfwd_write(struct ssh_channel *c, char *buf, int len) { |
783415f8 |
1766 | if (ssh_version == 1) { |
1767 | send_packet(SSH1_MSG_CHANNEL_DATA, |
1768 | PKT_INT, c->remoteid, |
1769 | PKT_INT, len, |
1770 | PKT_DATA, buf, len, |
1771 | PKT_END); |
1772 | } else { |
1773 | ssh2_add_channel_data(c, buf, len); |
1774 | ssh2_try_send(c); |
1775 | } |
9c964e85 |
1776 | } |
1777 | |
e5574168 |
1778 | static void ssh1_protocol(unsigned char *in, int inlen, int ispkt) { |
fb09bf1c |
1779 | crBegin; |
1780 | |
1781 | random_init(); |
1782 | |
e5574168 |
1783 | while (!do_ssh1_login(in, inlen, ispkt)) { |
fb09bf1c |
1784 | crReturnV; |
85ee8208 |
1785 | } |
1786 | if (ssh_state == SSH_STATE_CLOSED) |
1787 | crReturnV; |
fb09bf1c |
1788 | |
979310f1 |
1789 | if (cfg.agentfwd && agent_exists()) { |
dacbd0e8 |
1790 | logevent("Requesting agent forwarding"); |
1791 | send_packet(SSH1_CMSG_AGENT_REQUEST_FORWARDING, PKT_END); |
1792 | do { crReturnV; } while (!ispkt); |
1793 | if (pktin.type != SSH1_SMSG_SUCCESS && pktin.type != SSH1_SMSG_FAILURE) { |
8d5de777 |
1794 | bombout(("Protocol confusion")); |
1795 | crReturnV; |
dacbd0e8 |
1796 | } else if (pktin.type == SSH1_SMSG_FAILURE) { |
1797 | logevent("Agent forwarding refused"); |
db7d555c |
1798 | } else { |
dacbd0e8 |
1799 | logevent("Agent forwarding enabled"); |
db7d555c |
1800 | ssh_agentfwd_enabled = TRUE; |
1801 | } |
dacbd0e8 |
1802 | } |
1803 | |
9c964e85 |
1804 | if (cfg.x11_forward) { |
1805 | char proto[20], data[64]; |
1806 | logevent("Requesting X11 forwarding"); |
1807 | x11_invent_auth(proto, sizeof(proto), data, sizeof(data)); |
1808 | send_packet(SSH1_CMSG_X11_REQUEST_FORWARDING, |
1809 | PKT_STR, proto, PKT_STR, data, |
1810 | PKT_INT, 0, |
1811 | PKT_END); |
1812 | do { crReturnV; } while (!ispkt); |
1813 | if (pktin.type != SSH1_SMSG_SUCCESS && pktin.type != SSH1_SMSG_FAILURE) { |
1814 | bombout(("Protocol confusion")); |
1815 | crReturnV; |
1816 | } else if (pktin.type == SSH1_SMSG_FAILURE) { |
1817 | logevent("X11 forwarding refused"); |
1818 | } else { |
1819 | logevent("X11 forwarding enabled"); |
1820 | ssh_X11_fwd_enabled = TRUE; |
1821 | } |
1822 | } |
1823 | |
fef97f43 |
1824 | if (!cfg.nopty) { |
e5574168 |
1825 | send_packet(SSH1_CMSG_REQUEST_PTY, |
fb09bf1c |
1826 | PKT_STR, cfg.termtype, |
1827 | PKT_INT, rows, PKT_INT, cols, |
1828 | PKT_INT, 0, PKT_INT, 0, |
1829 | PKT_CHAR, 0, |
1830 | PKT_END); |
fef97f43 |
1831 | ssh_state = SSH_STATE_INTERMED; |
1832 | do { crReturnV; } while (!ispkt); |
e5574168 |
1833 | if (pktin.type != SSH1_SMSG_SUCCESS && pktin.type != SSH1_SMSG_FAILURE) { |
8d5de777 |
1834 | bombout(("Protocol confusion")); |
1835 | crReturnV; |
e5574168 |
1836 | } else if (pktin.type == SSH1_SMSG_FAILURE) { |
fef97f43 |
1837 | c_write("Server refused to allocate pty\r\n", 32); |
1838 | } |
c5e9c988 |
1839 | logevent("Allocated pty"); |
374330e2 |
1840 | } |
1841 | |
4ba9b64b |
1842 | if (cfg.compression) { |
1843 | send_packet(SSH1_CMSG_REQUEST_COMPRESSION, PKT_INT, 6, PKT_END); |
1844 | do { crReturnV; } while (!ispkt); |
1845 | if (pktin.type != SSH1_SMSG_SUCCESS && pktin.type != SSH1_SMSG_FAILURE) { |
1846 | bombout(("Protocol confusion")); |
1847 | crReturnV; |
1848 | } else if (pktin.type == SSH1_SMSG_FAILURE) { |
1849 | c_write("Server refused to compress\r\n", 32); |
1850 | } |
1851 | logevent("Started compression"); |
1852 | ssh1_compressing = TRUE; |
1853 | zlib_compress_init(); |
1854 | zlib_decompress_init(); |
1855 | } |
1856 | |
6abbf9e3 |
1857 | if (*cfg.remote_cmd) |
1858 | send_packet(SSH1_CMSG_EXEC_CMD, PKT_STR, cfg.remote_cmd, PKT_END); |
1859 | else |
1860 | send_packet(SSH1_CMSG_EXEC_SHELL, PKT_END); |
c5e9c988 |
1861 | logevent("Started session"); |
374330e2 |
1862 | |
1863 | ssh_state = SSH_STATE_SESSION; |
1864 | if (size_needed) |
1865 | ssh_size(); |
3687d221 |
1866 | if (eof_needed) |
1867 | ssh_special(TS_EOF); |
374330e2 |
1868 | |
8ccc75b0 |
1869 | ssh_send_ok = 1; |
dacbd0e8 |
1870 | ssh_channels = newtree234(ssh_channelcmp); |
6f34e365 |
1871 | begin_session(); |
374330e2 |
1872 | while (1) { |
1873 | crReturnV; |
1874 | if (ispkt) { |
e5574168 |
1875 | if (pktin.type == SSH1_SMSG_STDOUT_DATA || |
1876 | pktin.type == SSH1_SMSG_STDERR_DATA) { |
fb09bf1c |
1877 | long len = GET_32BIT(pktin.body); |
fe50e814 |
1878 | from_backend(pktin.type == SSH1_SMSG_STDERR_DATA, |
1879 | pktin.body+4, len); |
e5574168 |
1880 | } else if (pktin.type == SSH1_MSG_DISCONNECT) { |
21248260 |
1881 | ssh_state = SSH_STATE_CLOSED; |
c5e9c988 |
1882 | logevent("Received disconnect request"); |
3257deae |
1883 | crReturnV; |
9c964e85 |
1884 | } else if (pktin.type == SSH1_SMSG_X11_OPEN) { |
1885 | /* Remote side is trying to open a channel to talk to our |
1886 | * X-Server. Give them back a local channel number. */ |
1887 | unsigned i; |
1888 | struct ssh_channel *c, *d; |
1889 | enum234 e; |
1890 | |
1891 | logevent("Received X11 connect request"); |
1892 | /* Refuse if X11 forwarding is disabled. */ |
1893 | if (!ssh_X11_fwd_enabled) { |
1894 | send_packet(SSH1_MSG_CHANNEL_OPEN_FAILURE, |
1895 | PKT_INT, GET_32BIT(pktin.body), |
1896 | PKT_END); |
1897 | logevent("Rejected X11 connect request"); |
1898 | } else { |
1899 | char *rh; |
1900 | |
1901 | c = smalloc(sizeof(struct ssh_channel)); |
1902 | |
1903 | if ( x11_init(&c->u.x11.s, cfg.x11_display, c, &rh) != NULL ) { |
1904 | logevent("opening X11 forward connection failed"); |
1905 | sfree(c); |
1906 | send_packet(SSH1_MSG_CHANNEL_OPEN_FAILURE, |
1907 | PKT_INT, GET_32BIT(pktin.body), |
1908 | PKT_END); |
1909 | } else { |
1910 | logevent("opening X11 forward connection succeeded"); |
1911 | for (i=1, d = first234(ssh_channels, &e); d; d = next234(&e)) { |
783415f8 |
1912 | if (d->localid > i) |
1913 | break; /* found a free number */ |
1914 | i = d->localid + 1; |
9c964e85 |
1915 | } |
1916 | c->remoteid = GET_32BIT(pktin.body); |
1917 | c->localid = i; |
1918 | c->closes = 0; |
783415f8 |
1919 | c->type = CHAN_X11; /* identify channel type */ |
9c964e85 |
1920 | add234(ssh_channels, c); |
1921 | send_packet(SSH1_MSG_CHANNEL_OPEN_CONFIRMATION, |
1922 | PKT_INT, c->remoteid, PKT_INT, c->localid, |
1923 | PKT_END); |
1924 | logevent("Opened X11 forward channel"); |
1925 | } |
1926 | } |
dacbd0e8 |
1927 | } else if (pktin.type == SSH1_SMSG_AGENT_OPEN) { |
1928 | /* Remote side is trying to open a channel to talk to our |
1929 | * agent. Give them back a local channel number. */ |
db7d555c |
1930 | unsigned i; |
dacbd0e8 |
1931 | struct ssh_channel *c; |
1932 | enum234 e; |
db7d555c |
1933 | |
1934 | /* Refuse if agent forwarding is disabled. */ |
1935 | if (!ssh_agentfwd_enabled) { |
1936 | send_packet(SSH1_MSG_CHANNEL_OPEN_FAILURE, |
1937 | PKT_INT, GET_32BIT(pktin.body), |
1938 | PKT_END); |
1939 | } else { |
1940 | i = 1; |
1941 | for (c = first234(ssh_channels, &e); c; c = next234(&e)) { |
1942 | if (c->localid > i) |
1943 | break; /* found a free number */ |
1944 | i = c->localid + 1; |
1945 | } |
dcbde236 |
1946 | c = smalloc(sizeof(struct ssh_channel)); |
db7d555c |
1947 | c->remoteid = GET_32BIT(pktin.body); |
1948 | c->localid = i; |
1949 | c->closes = 0; |
783415f8 |
1950 | c->type = CHAN_AGENT; /* identify channel type */ |
db7d555c |
1951 | c->u.a.lensofar = 0; |
1952 | add234(ssh_channels, c); |
1953 | send_packet(SSH1_MSG_CHANNEL_OPEN_CONFIRMATION, |
1954 | PKT_INT, c->remoteid, PKT_INT, c->localid, |
1955 | PKT_END); |
1956 | } |
1957 | } else if (pktin.type == SSH1_MSG_CHANNEL_CLOSE || |
1958 | pktin.type == SSH1_MSG_CHANNEL_CLOSE_CONFIRMATION) { |
dacbd0e8 |
1959 | /* Remote side closes a channel. */ |
d211621f |
1960 | unsigned i = GET_32BIT(pktin.body); |
dacbd0e8 |
1961 | struct ssh_channel *c; |
1962 | c = find234(ssh_channels, &i, ssh_channelfind); |
1963 | if (c) { |
1964 | int closetype; |
1965 | closetype = (pktin.type == SSH1_MSG_CHANNEL_CLOSE ? 1 : 2); |
1966 | send_packet(pktin.type, PKT_INT, c->remoteid, PKT_END); |
783415f8 |
1967 | if ((c->closes == 0) && (c->type == CHAN_X11)) { |
9c964e85 |
1968 | logevent("X11 connection closed"); |
1969 | assert(c->u.x11.s != NULL); |
1970 | x11_close(c->u.x11.s); |
1971 | c->u.x11.s = NULL; |
1972 | } |
dacbd0e8 |
1973 | c->closes |= closetype; |
1974 | if (c->closes == 3) { |
1975 | del234(ssh_channels, c); |
dcbde236 |
1976 | sfree(c); |
dacbd0e8 |
1977 | } |
1978 | } |
1979 | } else if (pktin.type == SSH1_MSG_CHANNEL_DATA) { |
1980 | /* Data sent down one of our channels. */ |
1981 | int i = GET_32BIT(pktin.body); |
1982 | int len = GET_32BIT(pktin.body+4); |
1983 | unsigned char *p = pktin.body+8; |
1984 | struct ssh_channel *c; |
1985 | c = find234(ssh_channels, &i, ssh_channelfind); |
1986 | if (c) { |
1987 | switch(c->type) { |
783415f8 |
1988 | case CHAN_X11: |
9c964e85 |
1989 | x11_send(c->u.x11.s, p, len); |
1990 | break; |
783415f8 |
1991 | case CHAN_AGENT: |
dacbd0e8 |
1992 | /* Data for an agent message. Buffer it. */ |
1993 | while (len > 0) { |
1994 | if (c->u.a.lensofar < 4) { |
1995 | int l = min(4 - c->u.a.lensofar, len); |
1996 | memcpy(c->u.a.msglen + c->u.a.lensofar, p, l); |
1997 | p += l; len -= l; c->u.a.lensofar += l; |
1998 | } |
1999 | if (c->u.a.lensofar == 4) { |
2000 | c->u.a.totallen = 4 + GET_32BIT(c->u.a.msglen); |
dcbde236 |
2001 | c->u.a.message = smalloc(c->u.a.totallen); |
dacbd0e8 |
2002 | memcpy(c->u.a.message, c->u.a.msglen, 4); |
2003 | } |
2004 | if (c->u.a.lensofar >= 4 && len > 0) { |
2005 | int l = min(c->u.a.totallen - c->u.a.lensofar, len); |
2006 | memcpy(c->u.a.message + c->u.a.lensofar, p, l); |
2007 | p += l; len -= l; c->u.a.lensofar += l; |
2008 | } |
2009 | if (c->u.a.lensofar == c->u.a.totallen) { |
2010 | void *reply, *sentreply; |
2011 | int replylen; |
2012 | agent_query(c->u.a.message, c->u.a.totallen, |
2013 | &reply, &replylen); |
2014 | if (reply) |
2015 | sentreply = reply; |
2016 | else { |
2017 | /* Fake SSH_AGENT_FAILURE. */ |
2018 | sentreply = "\0\0\0\1\5"; |
2019 | replylen = 5; |
2020 | } |
2021 | send_packet(SSH1_MSG_CHANNEL_DATA, |
2022 | PKT_INT, c->remoteid, |
2023 | PKT_INT, replylen, |
2024 | PKT_DATA, sentreply, replylen, |
2025 | PKT_END); |
2026 | if (reply) |
dcbde236 |
2027 | sfree(reply); |
2028 | sfree(c->u.a.message); |
dacbd0e8 |
2029 | c->u.a.lensofar = 0; |
2030 | } |
2031 | } |
2032 | break; |
2033 | } |
2034 | } |
e5574168 |
2035 | } else if (pktin.type == SSH1_SMSG_SUCCESS) { |
972a41c8 |
2036 | /* may be from EXEC_SHELL on some servers */ |
e5574168 |
2037 | } else if (pktin.type == SSH1_SMSG_FAILURE) { |
972a41c8 |
2038 | /* may be from EXEC_SHELL on some servers |
374330e2 |
2039 | * if no pty is available or in other odd cases. Ignore */ |
e5574168 |
2040 | } else if (pktin.type == SSH1_SMSG_EXIT_STATUS) { |
2041 | send_packet(SSH1_CMSG_EXIT_CONFIRMATION, PKT_END); |
374330e2 |
2042 | } else { |
8d5de777 |
2043 | bombout(("Strange packet received: type %d", pktin.type)); |
2044 | crReturnV; |
374330e2 |
2045 | } |
2046 | } else { |
8df7a775 |
2047 | while (inlen > 0) { |
2048 | int len = min(inlen, 512); |
2049 | send_packet(SSH1_CMSG_STDIN_DATA, |
2050 | PKT_INT, len, PKT_DATA, in, len, PKT_END); |
2051 | in += len; |
2052 | inlen -= len; |
2053 | } |
374330e2 |
2054 | } |
2055 | } |
2056 | |
2057 | crFinishV; |
2058 | } |
2059 | |
2060 | /* |
e5574168 |
2061 | * Utility routine for decoding comma-separated strings in KEXINIT. |
2062 | */ |
75cab814 |
2063 | static int in_commasep_string(char *needle, char *haystack, int haylen) { |
e5574168 |
2064 | int needlen = strlen(needle); |
2065 | while (1) { |
2066 | /* |
2067 | * Is it at the start of the string? |
2068 | */ |
2069 | if (haylen >= needlen && /* haystack is long enough */ |
2070 | !memcmp(needle, haystack, needlen) && /* initial match */ |
2071 | (haylen == needlen || haystack[needlen] == ',') |
2072 | /* either , or EOS follows */ |
2073 | ) |
2074 | return 1; |
2075 | /* |
2076 | * If not, search for the next comma and resume after that. |
2077 | * If no comma found, terminate. |
2078 | */ |
2079 | while (haylen > 0 && *haystack != ',') |
2080 | haylen--, haystack++; |
2081 | if (haylen == 0) |
2082 | return 0; |
2083 | haylen--, haystack++; /* skip over comma itself */ |
2084 | } |
2085 | } |
2086 | |
2087 | /* |
d39f364a |
2088 | * SSH2 key creation method. |
2089 | */ |
75cab814 |
2090 | static void ssh2_mkkey(Bignum K, char *H, char chr, char *keyspace) { |
d39f364a |
2091 | SHA_State s; |
2092 | /* First 20 bytes. */ |
2093 | SHA_Init(&s); |
2094 | sha_mpint(&s, K); |
2095 | SHA_Bytes(&s, H, 20); |
2096 | SHA_Bytes(&s, &chr, 1); |
2097 | SHA_Bytes(&s, H, 20); |
2098 | SHA_Final(&s, keyspace); |
2099 | /* Next 20 bytes. */ |
2100 | SHA_Init(&s); |
2101 | sha_mpint(&s, K); |
2102 | SHA_Bytes(&s, H, 20); |
2103 | SHA_Bytes(&s, keyspace, 20); |
2104 | SHA_Final(&s, keyspace+20); |
2105 | } |
2106 | |
2107 | /* |
7cca0d81 |
2108 | * Handle the SSH2 transport layer. |
e5574168 |
2109 | */ |
7cca0d81 |
2110 | static int do_ssh2_transport(unsigned char *in, int inlen, int ispkt) |
e5574168 |
2111 | { |
2112 | static int i, len; |
2113 | static char *str; |
2114 | static Bignum e, f, K; |
7591b9ff |
2115 | static const struct ssh_mac **maclist; |
8b2715b2 |
2116 | static int nmacs; |
57476f6b |
2117 | static const struct ssh_cipher *cscipher_tobe = NULL; |
2118 | static const struct ssh_cipher *sccipher_tobe = NULL; |
2119 | static const struct ssh_mac *csmac_tobe = NULL; |
2120 | static const struct ssh_mac *scmac_tobe = NULL; |
2121 | static const struct ssh_compress *cscomp_tobe = NULL; |
2122 | static const struct ssh_compress *sccomp_tobe = NULL; |
d5859615 |
2123 | static char *hostkeydata, *sigdata, *keystr, *fingerprint; |
e5574168 |
2124 | static int hostkeylen, siglen; |
e055a386 |
2125 | static void *hkey; /* actual host key */ |
e5574168 |
2126 | static unsigned char exchange_hash[20]; |
d39f364a |
2127 | static unsigned char keyspace[40]; |
57476f6b |
2128 | static const struct ssh_cipher *preferred_cipher; |
4ba9b64b |
2129 | static const struct ssh_compress *preferred_comp; |
0db56f73 |
2130 | static int first_kex; |
e5574168 |
2131 | |
2132 | crBegin; |
7cca0d81 |
2133 | random_init(); |
0db56f73 |
2134 | first_kex = 1; |
e5574168 |
2135 | |
5e8358ad |
2136 | /* |
4ba9b64b |
2137 | * Set up the preferred cipher and compression. |
5e8358ad |
2138 | */ |
2139 | if (cfg.cipher == CIPHER_BLOWFISH) { |
57476f6b |
2140 | preferred_cipher = &ssh_blowfish_ssh2; |
5e8358ad |
2141 | } else if (cfg.cipher == CIPHER_DES) { |
2142 | logevent("Single DES not supported in SSH2; using 3DES"); |
57476f6b |
2143 | preferred_cipher = &ssh_3des_ssh2; |
5e8358ad |
2144 | } else if (cfg.cipher == CIPHER_3DES) { |
57476f6b |
2145 | preferred_cipher = &ssh_3des_ssh2; |
5e8358ad |
2146 | } else { |
2147 | /* Shouldn't happen, but we do want to initialise to _something_. */ |
57476f6b |
2148 | preferred_cipher = &ssh_3des_ssh2; |
5e8358ad |
2149 | } |
4ba9b64b |
2150 | if (cfg.compression) |
2151 | preferred_comp = &ssh_zlib; |
2152 | else |
2153 | preferred_comp = &ssh_comp_none; |
5e8358ad |
2154 | |
7591b9ff |
2155 | /* |
2156 | * Be prepared to work around the buggy MAC problem. |
2157 | */ |
2158 | if (cfg.buggymac) |
8b2715b2 |
2159 | maclist = buggymacs, nmacs = lenof(buggymacs); |
7591b9ff |
2160 | else |
8b2715b2 |
2161 | maclist = macs, nmacs = lenof(macs); |
7591b9ff |
2162 | |
7cca0d81 |
2163 | begin_key_exchange: |
e5574168 |
2164 | /* |
2165 | * Construct and send our key exchange packet. |
2166 | */ |
2167 | ssh2_pkt_init(SSH2_MSG_KEXINIT); |
2168 | for (i = 0; i < 16; i++) |
2169 | ssh2_pkt_addbyte((unsigned char)random_byte()); |
2170 | /* List key exchange algorithms. */ |
2171 | ssh2_pkt_addstring_start(); |
2172 | for (i = 0; i < lenof(kex_algs); i++) { |
2173 | ssh2_pkt_addstring_str(kex_algs[i]->name); |
2174 | if (i < lenof(kex_algs)-1) |
2175 | ssh2_pkt_addstring_str(","); |
2176 | } |
2177 | /* List server host key algorithms. */ |
2178 | ssh2_pkt_addstring_start(); |
2179 | for (i = 0; i < lenof(hostkey_algs); i++) { |
2180 | ssh2_pkt_addstring_str(hostkey_algs[i]->name); |
2181 | if (i < lenof(hostkey_algs)-1) |
2182 | ssh2_pkt_addstring_str(","); |
2183 | } |
2184 | /* List client->server encryption algorithms. */ |
2185 | ssh2_pkt_addstring_start(); |
729e54b4 |
2186 | for (i = 0; i < lenof(ciphers)+1; i++) { |
2187 | const struct ssh_cipher *c = i==0 ? preferred_cipher : ciphers[i-1]; |
57476f6b |
2188 | ssh2_pkt_addstring_str(c->name); |
729e54b4 |
2189 | if (i < lenof(ciphers)) |
e5574168 |
2190 | ssh2_pkt_addstring_str(","); |
2191 | } |
2192 | /* List server->client encryption algorithms. */ |
2193 | ssh2_pkt_addstring_start(); |
729e54b4 |
2194 | for (i = 0; i < lenof(ciphers)+1; i++) { |
2195 | const struct ssh_cipher *c = i==0 ? preferred_cipher : ciphers[i-1]; |
57476f6b |
2196 | ssh2_pkt_addstring_str(c->name); |
729e54b4 |
2197 | if (i < lenof(ciphers)) |
e5574168 |
2198 | ssh2_pkt_addstring_str(","); |
2199 | } |
2200 | /* List client->server MAC algorithms. */ |
2201 | ssh2_pkt_addstring_start(); |
8b2715b2 |
2202 | for (i = 0; i < nmacs; i++) { |
7591b9ff |
2203 | ssh2_pkt_addstring_str(maclist[i]->name); |
8b2715b2 |
2204 | if (i < nmacs-1) |
e5574168 |
2205 | ssh2_pkt_addstring_str(","); |
2206 | } |
2207 | /* List server->client MAC algorithms. */ |
2208 | ssh2_pkt_addstring_start(); |
8b2715b2 |
2209 | for (i = 0; i < nmacs; i++) { |
7591b9ff |
2210 | ssh2_pkt_addstring_str(maclist[i]->name); |
8b2715b2 |
2211 | if (i < nmacs-1) |
e5574168 |
2212 | ssh2_pkt_addstring_str(","); |
2213 | } |
2214 | /* List client->server compression algorithms. */ |
2215 | ssh2_pkt_addstring_start(); |
4ba9b64b |
2216 | for (i = 0; i < lenof(compressions)+1; i++) { |
2217 | const struct ssh_compress *c = i==0 ? preferred_comp : compressions[i-1]; |
2218 | ssh2_pkt_addstring_str(c->name); |
2219 | if (i < lenof(compressions)) |
e5574168 |
2220 | ssh2_pkt_addstring_str(","); |
2221 | } |
2222 | /* List server->client compression algorithms. */ |
2223 | ssh2_pkt_addstring_start(); |
4ba9b64b |
2224 | for (i = 0; i < lenof(compressions)+1; i++) { |
2225 | const struct ssh_compress *c = i==0 ? preferred_comp : compressions[i-1]; |
2226 | ssh2_pkt_addstring_str(c->name); |
2227 | if (i < lenof(compressions)) |
e5574168 |
2228 | ssh2_pkt_addstring_str(","); |
2229 | } |
2230 | /* List client->server languages. Empty list. */ |
2231 | ssh2_pkt_addstring_start(); |
2232 | /* List server->client languages. Empty list. */ |
2233 | ssh2_pkt_addstring_start(); |
2234 | /* First KEX packet does _not_ follow, because we're not that brave. */ |
2235 | ssh2_pkt_addbool(FALSE); |
2236 | /* Reserved. */ |
2237 | ssh2_pkt_adduint32(0); |
0db56f73 |
2238 | |
2239 | exhash = exhashbase; |
e5574168 |
2240 | sha_string(&exhash, pktout.data+5, pktout.length-5); |
0db56f73 |
2241 | |
e5574168 |
2242 | ssh2_pkt_send(); |
2243 | |
2244 | if (!ispkt) crWaitUntil(ispkt); |
2245 | sha_string(&exhash, pktin.data+5, pktin.length-5); |
2246 | |
2247 | /* |
2248 | * Now examine the other side's KEXINIT to see what we're up |
2249 | * to. |
2250 | */ |
7cca0d81 |
2251 | if (pktin.type != SSH2_MSG_KEXINIT) { |
8d5de777 |
2252 | bombout(("expected key exchange packet from server")); |
2253 | crReturn(0); |
7cca0d81 |
2254 | } |
e5574168 |
2255 | kex = NULL; hostkey = NULL; cscipher_tobe = NULL; sccipher_tobe = NULL; |
2256 | csmac_tobe = NULL; scmac_tobe = NULL; cscomp_tobe = NULL; sccomp_tobe = NULL; |
2257 | pktin.savedpos += 16; /* skip garbage cookie */ |
2258 | ssh2_pkt_getstring(&str, &len); /* key exchange algorithms */ |
2259 | for (i = 0; i < lenof(kex_algs); i++) { |
2260 | if (in_commasep_string(kex_algs[i]->name, str, len)) { |
2261 | kex = kex_algs[i]; |
2262 | break; |
2263 | } |
2264 | } |
2265 | ssh2_pkt_getstring(&str, &len); /* host key algorithms */ |
2266 | for (i = 0; i < lenof(hostkey_algs); i++) { |
2267 | if (in_commasep_string(hostkey_algs[i]->name, str, len)) { |
2268 | hostkey = hostkey_algs[i]; |
2269 | break; |
2270 | } |
2271 | } |
2272 | ssh2_pkt_getstring(&str, &len); /* client->server cipher */ |
729e54b4 |
2273 | for (i = 0; i < lenof(ciphers)+1; i++) { |
2274 | const struct ssh_cipher *c = i==0 ? preferred_cipher : ciphers[i-1]; |
57476f6b |
2275 | if (in_commasep_string(c->name, str, len)) { |
729e54b4 |
2276 | cscipher_tobe = c; |
e5574168 |
2277 | break; |
2278 | } |
2279 | } |
2280 | ssh2_pkt_getstring(&str, &len); /* server->client cipher */ |
729e54b4 |
2281 | for (i = 0; i < lenof(ciphers)+1; i++) { |
2282 | const struct ssh_cipher *c = i==0 ? preferred_cipher : ciphers[i-1]; |
57476f6b |
2283 | if (in_commasep_string(c->name, str, len)) { |
729e54b4 |
2284 | sccipher_tobe = c; |
e5574168 |
2285 | break; |
2286 | } |
2287 | } |
2288 | ssh2_pkt_getstring(&str, &len); /* client->server mac */ |
8b2715b2 |
2289 | for (i = 0; i < nmacs; i++) { |
7591b9ff |
2290 | if (in_commasep_string(maclist[i]->name, str, len)) { |
2291 | csmac_tobe = maclist[i]; |
e5574168 |
2292 | break; |
2293 | } |
2294 | } |
2295 | ssh2_pkt_getstring(&str, &len); /* server->client mac */ |
8b2715b2 |
2296 | for (i = 0; i < nmacs; i++) { |
7591b9ff |
2297 | if (in_commasep_string(maclist[i]->name, str, len)) { |
2298 | scmac_tobe = maclist[i]; |
e5574168 |
2299 | break; |
2300 | } |
2301 | } |
2302 | ssh2_pkt_getstring(&str, &len); /* client->server compression */ |
4ba9b64b |
2303 | for (i = 0; i < lenof(compressions)+1; i++) { |
2304 | const struct ssh_compress *c = i==0 ? preferred_comp : compressions[i-1]; |
2305 | if (in_commasep_string(c->name, str, len)) { |
2306 | cscomp_tobe = c; |
e5574168 |
2307 | break; |
2308 | } |
2309 | } |
2310 | ssh2_pkt_getstring(&str, &len); /* server->client compression */ |
4ba9b64b |
2311 | for (i = 0; i < lenof(compressions)+1; i++) { |
2312 | const struct ssh_compress *c = i==0 ? preferred_comp : compressions[i-1]; |
2313 | if (in_commasep_string(c->name, str, len)) { |
2314 | sccomp_tobe = c; |
e5574168 |
2315 | break; |
2316 | } |
2317 | } |
e5574168 |
2318 | |
2319 | /* |
2320 | * Currently we only support Diffie-Hellman and DSS, so let's |
2321 | * bomb out if those aren't selected. |
2322 | */ |
8d5de777 |
2323 | if (kex != &ssh_diffiehellman || hostkey != &ssh_dss) { |
2324 | bombout(("internal fault: chaos in SSH 2 transport layer")); |
2325 | crReturn(0); |
2326 | } |
e5574168 |
2327 | |
2328 | /* |
2329 | * Now we begin the fun. Generate and send e for Diffie-Hellman. |
2330 | */ |
2331 | e = dh_create_e(); |
e5574168 |
2332 | ssh2_pkt_init(SSH2_MSG_KEXDH_INIT); |
2333 | ssh2_pkt_addmp(e); |
2334 | ssh2_pkt_send(); |
2335 | |
2336 | crWaitUntil(ispkt); |
7cca0d81 |
2337 | if (pktin.type != SSH2_MSG_KEXDH_REPLY) { |
8d5de777 |
2338 | bombout(("expected key exchange packet from server")); |
2339 | crReturn(0); |
7cca0d81 |
2340 | } |
e5574168 |
2341 | ssh2_pkt_getstring(&hostkeydata, &hostkeylen); |
2342 | f = ssh2_pkt_getmp(); |
e5574168 |
2343 | ssh2_pkt_getstring(&sigdata, &siglen); |
2344 | |
2345 | K = dh_find_K(f); |
e5574168 |
2346 | |
2347 | sha_string(&exhash, hostkeydata, hostkeylen); |
2348 | sha_mpint(&exhash, e); |
2349 | sha_mpint(&exhash, f); |
2350 | sha_mpint(&exhash, K); |
2351 | SHA_Final(&exhash, exchange_hash); |
2352 | |
7cca0d81 |
2353 | #if 0 |
e5574168 |
2354 | debug(("Exchange hash is:\r\n")); |
2355 | for (i = 0; i < 20; i++) |
2356 | debug((" %02x", exchange_hash[i])); |
2357 | debug(("\r\n")); |
7cca0d81 |
2358 | #endif |
2359 | |
e055a386 |
2360 | hkey = hostkey->newkey(hostkeydata, hostkeylen); |
2361 | if (!hostkey->verifysig(hkey, sigdata, siglen, exchange_hash, 20)) { |
8d5de777 |
2362 | bombout(("Server failed host key check")); |
2363 | crReturn(0); |
2364 | } |
e5574168 |
2365 | |
2366 | /* |
7cca0d81 |
2367 | * Expect SSH2_MSG_NEWKEYS from server. |
d39f364a |
2368 | */ |
7cca0d81 |
2369 | crWaitUntil(ispkt); |
8d5de777 |
2370 | if (pktin.type != SSH2_MSG_NEWKEYS) { |
2371 | bombout(("expected new-keys packet from server")); |
2372 | crReturn(0); |
2373 | } |
d39f364a |
2374 | |
2375 | /* |
7cca0d81 |
2376 | * Authenticate remote host: verify host key. (We've already |
2377 | * checked the signature of the exchange hash.) |
e5574168 |
2378 | */ |
e055a386 |
2379 | keystr = hostkey->fmtkey(hkey); |
2380 | fingerprint = hostkey->fingerprint(hkey); |
d4857987 |
2381 | verify_ssh_host_key(savedhost, savedport, hostkey->keytype, |
2382 | keystr, fingerprint); |
d5859615 |
2383 | logevent("Host key fingerprint is:"); |
2384 | logevent(fingerprint); |
dcbde236 |
2385 | sfree(fingerprint); |
2386 | sfree(keystr); |
e055a386 |
2387 | hostkey->freekey(hkey); |
d39f364a |
2388 | |
2389 | /* |
7cca0d81 |
2390 | * Send SSH2_MSG_NEWKEYS. |
d39f364a |
2391 | */ |
2392 | ssh2_pkt_init(SSH2_MSG_NEWKEYS); |
2393 | ssh2_pkt_send(); |
d39f364a |
2394 | |
2395 | /* |
2396 | * Create and initialise session keys. |
2397 | */ |
2398 | cscipher = cscipher_tobe; |
2399 | sccipher = sccipher_tobe; |
2400 | csmac = csmac_tobe; |
2401 | scmac = scmac_tobe; |
2402 | cscomp = cscomp_tobe; |
2403 | sccomp = sccomp_tobe; |
4ba9b64b |
2404 | cscomp->compress_init(); |
2405 | sccomp->decompress_init(); |
d39f364a |
2406 | /* |
2407 | * Set IVs after keys. |
2408 | */ |
2409 | ssh2_mkkey(K, exchange_hash, 'C', keyspace); cscipher->setcskey(keyspace); |
21d7754f |
2410 | ssh2_mkkey(K, exchange_hash, 'D', keyspace); sccipher->setsckey(keyspace); |
d39f364a |
2411 | ssh2_mkkey(K, exchange_hash, 'A', keyspace); cscipher->setcsiv(keyspace); |
2412 | ssh2_mkkey(K, exchange_hash, 'B', keyspace); sccipher->setsciv(keyspace); |
2413 | ssh2_mkkey(K, exchange_hash, 'E', keyspace); csmac->setcskey(keyspace); |
2414 | ssh2_mkkey(K, exchange_hash, 'F', keyspace); scmac->setsckey(keyspace); |
2415 | |
033b4cef |
2416 | /* |
0db56f73 |
2417 | * If this is the first key exchange phase, we must pass the |
2418 | * SSH2_MSG_NEWKEYS packet to the next layer, not because it |
2419 | * wants to see it but because it will need time to initialise |
2420 | * itself before it sees an actual packet. In subsequent key |
2421 | * exchange phases, we don't pass SSH2_MSG_NEWKEYS on, because |
2422 | * it would only confuse the layer above. |
2423 | */ |
2424 | if (!first_kex) { |
2425 | crReturn(0); |
2426 | } |
2427 | first_kex = 0; |
2428 | |
2429 | /* |
7cca0d81 |
2430 | * Now we're encrypting. Begin returning 1 to the protocol main |
2431 | * function so that other things can run on top of the |
2432 | * transport. If we ever see a KEXINIT, we must go back to the |
2433 | * start. |
033b4cef |
2434 | */ |
7cca0d81 |
2435 | do { |
2436 | crReturn(1); |
2437 | } while (!(ispkt && pktin.type == SSH2_MSG_KEXINIT)); |
2438 | goto begin_key_exchange; |
e5574168 |
2439 | |
2440 | crFinish(1); |
2441 | } |
2442 | |
7cca0d81 |
2443 | /* |
783415f8 |
2444 | * Add data to an SSH2 channel output buffer. |
2445 | */ |
2446 | static void ssh2_add_channel_data(struct ssh_channel *c, char *buf, int len) { |
2447 | if (c->v2.outbufsize < |
2448 | c->v2.outbuflen + len) { |
2449 | c->v2.outbufsize = |
2450 | c->v2.outbuflen + len + 1024; |
2451 | c->v2.outbuffer = srealloc(c->v2.outbuffer, |
2452 | c->v2.outbufsize); |
2453 | } |
2454 | memcpy(c->v2.outbuffer + c->v2.outbuflen, |
2455 | buf, len); |
2456 | c->v2.outbuflen += len; |
2457 | } |
2458 | |
2459 | /* |
2460 | * Attempt to send data on an SSH2 channel. |
2461 | */ |
2462 | static void ssh2_try_send(struct ssh_channel *c) { |
2463 | while (c->v2.remwindow > 0 && |
2464 | c->v2.outbuflen > 0) { |
2465 | unsigned len = c->v2.remwindow; |
2466 | if (len > c->v2.outbuflen) |
2467 | len = c->v2.outbuflen; |
2468 | if (len > c->v2.remmaxpkt) |
2469 | len = c->v2.remmaxpkt; |
2470 | ssh2_pkt_init(SSH2_MSG_CHANNEL_DATA); |
2471 | ssh2_pkt_adduint32(c->remoteid); |
2472 | ssh2_pkt_addstring_start(); |
2473 | ssh2_pkt_addstring_data(c->v2.outbuffer, len); |
2474 | ssh2_pkt_send(); |
2475 | c->v2.outbuflen -= len; |
2476 | memmove(c->v2.outbuffer, c->v2.outbuffer+len, |
2477 | c->v2.outbuflen); |
2478 | c->v2.remwindow -= len; |
2479 | } |
2480 | } |
2481 | |
2482 | /* |
7cca0d81 |
2483 | * Handle the SSH2 userauth and connection layers. |
2484 | */ |
2485 | static void do_ssh2_authconn(unsigned char *in, int inlen, int ispkt) |
2486 | { |
7cca0d81 |
2487 | static unsigned long remote_winsize; |
2488 | static unsigned long remote_maxpkt; |
2489 | |
e5574168 |
2490 | crBegin; |
2491 | |
7cca0d81 |
2492 | /* |
2493 | * Request userauth protocol, and await a response to it. |
2494 | */ |
2495 | ssh2_pkt_init(SSH2_MSG_SERVICE_REQUEST); |
2496 | ssh2_pkt_addstring("ssh-userauth"); |
2497 | ssh2_pkt_send(); |
2498 | crWaitUntilV(ispkt); |
8d5de777 |
2499 | if (pktin.type != SSH2_MSG_SERVICE_ACCEPT) { |
2500 | bombout(("Server refused user authentication protocol")); |
2501 | crReturnV; |
2502 | } |
7cca0d81 |
2503 | |
2504 | /* |
2505 | * FIXME: currently we support only password authentication. |
2506 | * (This places us technically in violation of the SSH2 spec. |
2507 | * We must fix this.) |
2508 | */ |
2509 | while (1) { |
2510 | /* |
2511 | * Get a username and a password. |
2512 | */ |
2513 | static char username[100]; |
2514 | static char password[100]; |
2515 | static int pos = 0; |
2516 | static char c; |
e5574168 |
2517 | |
67779be7 |
2518 | if ((flags & FLAG_INTERACTIVE) && !*cfg.username) { |
7cca0d81 |
2519 | c_write("login as: ", 10); |
67779be7 |
2520 | ssh_send_ok = 1; |
7cca0d81 |
2521 | while (pos >= 0) { |
2522 | crWaitUntilV(!ispkt); |
2523 | while (inlen--) switch (c = *in++) { |
2524 | case 10: case 13: |
2525 | username[pos] = 0; |
2526 | pos = -1; |
2527 | break; |
2528 | case 8: case 127: |
2529 | if (pos > 0) { |
2530 | c_write("\b \b", 3); |
2531 | pos--; |
2532 | } |
2533 | break; |
2534 | case 21: case 27: |
2535 | while (pos > 0) { |
2536 | c_write("\b \b", 3); |
2537 | pos--; |
2538 | } |
2539 | break; |
2540 | case 3: case 4: |
2541 | random_save_seed(); |
2542 | exit(0); |
2543 | break; |
2544 | default: |
2545 | if (((c >= ' ' && c <= '~') || |
2546 | ((unsigned char)c >= 160)) && pos < 40) { |
2547 | username[pos++] = c; |
2548 | c_write(&c, 1); |
2549 | } |
2550 | break; |
2551 | } |
2552 | } |
2553 | c_write("\r\n", 2); |
2554 | username[strcspn(username, "\n\r")] = '\0'; |
2555 | } else { |
2556 | char stuff[200]; |
2557 | strncpy(username, cfg.username, 99); |
2558 | username[99] = '\0'; |
67779be7 |
2559 | if ((flags & FLAG_VERBOSE) || (flags & FLAG_INTERACTIVE)) { |
7cca0d81 |
2560 | sprintf(stuff, "Using username \"%s\".\r\n", username); |
2561 | c_write(stuff, strlen(stuff)); |
2562 | } |
2563 | } |
2564 | |
d8426c54 |
2565 | if (ssh_get_password) { |
7cca0d81 |
2566 | char prompt[200]; |
b585ec46 |
2567 | sprintf(prompt, "%.90s@%.90s's password: ", username, savedhost); |
7cca0d81 |
2568 | if (!ssh_get_password(prompt, password, sizeof(password))) { |
2569 | /* |
2570 | * get_password failed to get a password (for |
2571 | * example because one was supplied on the command |
2572 | * line which has already failed to work). |
2573 | * Terminate. |
2574 | */ |
2575 | logevent("No more passwords to try"); |
2576 | ssh_state = SSH_STATE_CLOSED; |
2577 | crReturnV; |
2578 | } |
2579 | } else { |
2580 | c_write("password: ", 10); |
67779be7 |
2581 | ssh_send_ok = 1; |
7cca0d81 |
2582 | |
2583 | pos = 0; |
2584 | while (pos >= 0) { |
2585 | crWaitUntilV(!ispkt); |
2586 | while (inlen--) switch (c = *in++) { |
2587 | case 10: case 13: |
2588 | password[pos] = 0; |
2589 | pos = -1; |
2590 | break; |
2591 | case 8: case 127: |
2592 | if (pos > 0) |
2593 | pos--; |
2594 | break; |
2595 | case 21: case 27: |
2596 | pos = 0; |
2597 | break; |
2598 | case 3: case 4: |
2599 | random_save_seed(); |
2600 | exit(0); |
2601 | break; |
2602 | default: |
2603 | if (((c >= ' ' && c <= '~') || |
2604 | ((unsigned char)c >= 160)) && pos < 40) |
2605 | password[pos++] = c; |
2606 | break; |
2607 | } |
2608 | } |
2609 | c_write("\r\n", 2); |
2610 | } |
2611 | |
2612 | ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST); |
2613 | ssh2_pkt_addstring(username); |
2614 | ssh2_pkt_addstring("ssh-connection"); /* service requested */ |
2615 | ssh2_pkt_addstring("password"); |
2616 | ssh2_pkt_addbool(FALSE); |
2617 | ssh2_pkt_addstring(password); |
2618 | ssh2_pkt_send(); |
2619 | |
2620 | crWaitUntilV(ispkt); |
2621 | if (pktin.type != SSH2_MSG_USERAUTH_SUCCESS) { |
2622 | c_write("Access denied\r\n", 15); |
2623 | logevent("Authentication refused"); |
2624 | } else |
2625 | break; |
2626 | } |
2627 | |
2628 | /* |
2629 | * Now we're authenticated for the connection protocol. The |
2630 | * connection protocol will automatically have started at this |
2631 | * point; there's no need to send SERVICE_REQUEST. |
2632 | */ |
2633 | |
2634 | /* |
2635 | * So now create a channel with a session in it. |
2636 | */ |
dcbde236 |
2637 | mainchan = smalloc(sizeof(struct ssh_channel)); |
d211621f |
2638 | mainchan->localid = 100; /* as good as any */ |
7cca0d81 |
2639 | ssh2_pkt_init(SSH2_MSG_CHANNEL_OPEN); |
2640 | ssh2_pkt_addstring("session"); |
d211621f |
2641 | ssh2_pkt_adduint32(mainchan->localid); |
cf6e59d6 |
2642 | ssh2_pkt_adduint32(0x8000UL); /* our window size */ |
d211621f |
2643 | ssh2_pkt_adduint32(0x4000UL); /* our max pkt size */ |
7cca0d81 |
2644 | ssh2_pkt_send(); |
2645 | crWaitUntilV(ispkt); |
2646 | if (pktin.type != SSH2_MSG_CHANNEL_OPEN_CONFIRMATION) { |
8d5de777 |
2647 | bombout(("Server refused to open a session")); |
2648 | crReturnV; |
7cca0d81 |
2649 | /* FIXME: error data comes back in FAILURE packet */ |
2650 | } |
d211621f |
2651 | if (ssh2_pkt_getuint32() != mainchan->localid) { |
8d5de777 |
2652 | bombout(("Server's channel confirmation cited wrong channel")); |
2653 | crReturnV; |
7cca0d81 |
2654 | } |
d211621f |
2655 | mainchan->remoteid = ssh2_pkt_getuint32(); |
783415f8 |
2656 | mainchan->type = CHAN_MAINSESSION; |
2657 | mainchan->closes = 0; |
2658 | mainchan->v2.remwindow = ssh2_pkt_getuint32(); |
2659 | mainchan->v2.remmaxpkt = ssh2_pkt_getuint32(); |
2660 | mainchan->v2.outbuffer = NULL; |
2661 | mainchan->v2.outbuflen = mainchan->v2.outbufsize = 0; |
2662 | ssh_channels = newtree234(ssh_channelcmp); |
2663 | add234(ssh_channels, mainchan); |
7cca0d81 |
2664 | logevent("Opened channel for session"); |
2665 | |
2666 | /* |
783415f8 |
2667 | * Potentially enable X11 forwarding. |
2668 | */ |
2669 | if (cfg.x11_forward) { |
2670 | char proto[20], data[64]; |
2671 | logevent("Requesting X11 forwarding"); |
2672 | x11_invent_auth(proto, sizeof(proto), data, sizeof(data)); |
2673 | ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST); |
2674 | ssh2_pkt_adduint32(mainchan->remoteid); |
2675 | ssh2_pkt_addstring("x11-req"); |
2676 | ssh2_pkt_addbool(1); /* want reply */ |
2677 | ssh2_pkt_addbool(0); /* many connections */ |
2678 | ssh2_pkt_addstring(proto); |
2679 | ssh2_pkt_addstring(data); |
2680 | ssh2_pkt_adduint32(0); /* screen number */ |
2681 | ssh2_pkt_send(); |
2682 | |
2683 | do { |
2684 | crWaitUntilV(ispkt); |
2685 | if (pktin.type == SSH2_MSG_CHANNEL_WINDOW_ADJUST) { |
2686 | unsigned i = ssh2_pkt_getuint32(); |
2687 | struct ssh_channel *c; |
2688 | c = find234(ssh_channels, &i, ssh_channelfind); |
2689 | if (!c) |
2690 | continue; /* nonexistent channel */ |
2691 | c->v2.remwindow += ssh2_pkt_getuint32(); |
2692 | } |
2693 | } while (pktin.type == SSH2_MSG_CHANNEL_WINDOW_ADJUST); |
2694 | |
2695 | if (pktin.type != SSH2_MSG_CHANNEL_SUCCESS) { |
2696 | if (pktin.type != SSH2_MSG_CHANNEL_FAILURE) { |
2697 | bombout(("Server got confused by X11 forwarding request")); |
2698 | crReturnV; |
2699 | } |
2700 | logevent("X11 forwarding refused"); |
2701 | } else { |
2702 | logevent("X11 forwarding enabled"); |
2703 | ssh_X11_fwd_enabled = TRUE; |
2704 | } |
2705 | } |
2706 | |
2707 | /* |
7cca0d81 |
2708 | * Now allocate a pty for the session. |
2709 | */ |
67779be7 |
2710 | if (!cfg.nopty) { |
2711 | ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST); |
2712 | ssh2_pkt_adduint32(mainchan->remoteid); /* recipient channel */ |
2713 | ssh2_pkt_addstring("pty-req"); |
2714 | ssh2_pkt_addbool(1); /* want reply */ |
2715 | ssh2_pkt_addstring(cfg.termtype); |
2716 | ssh2_pkt_adduint32(cols); |
2717 | ssh2_pkt_adduint32(rows); |
2718 | ssh2_pkt_adduint32(0); /* pixel width */ |
2719 | ssh2_pkt_adduint32(0); /* pixel height */ |
2720 | ssh2_pkt_addstring_start(); |
2721 | ssh2_pkt_addstring_data("\0", 1);/* TTY_OP_END, no special options */ |
2722 | ssh2_pkt_send(); |
6e48c3fe |
2723 | ssh_state = SSH_STATE_INTERMED; |
7cca0d81 |
2724 | |
67779be7 |
2725 | do { |
2726 | crWaitUntilV(ispkt); |
2727 | if (pktin.type == SSH2_MSG_CHANNEL_WINDOW_ADJUST) { |
783415f8 |
2728 | unsigned i = ssh2_pkt_getuint32(); |
2729 | struct ssh_channel *c; |
2730 | c = find234(ssh_channels, &i, ssh_channelfind); |
2731 | if (!c) |
2732 | continue; /* nonexistent channel */ |
2733 | c->v2.remwindow += ssh2_pkt_getuint32(); |
67779be7 |
2734 | } |
2735 | } while (pktin.type == SSH2_MSG_CHANNEL_WINDOW_ADJUST); |
7cca0d81 |
2736 | |
67779be7 |
2737 | if (pktin.type != SSH2_MSG_CHANNEL_SUCCESS) { |
2738 | if (pktin.type != SSH2_MSG_CHANNEL_FAILURE) { |
8d5de777 |
2739 | bombout(("Server got confused by pty request")); |
2740 | crReturnV; |
67779be7 |
2741 | } |
2742 | c_write("Server refused to allocate pty\r\n", 32); |
2743 | } else { |
2744 | logevent("Allocated pty"); |
7cca0d81 |
2745 | } |
7cca0d81 |
2746 | } |
2747 | |
2748 | /* |
67779be7 |
2749 | * Start a shell or a remote command. |
7cca0d81 |
2750 | */ |
2751 | ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST); |
d211621f |
2752 | ssh2_pkt_adduint32(mainchan->remoteid); /* recipient channel */ |
67779be7 |
2753 | if (*cfg.remote_cmd) { |
2754 | ssh2_pkt_addstring("exec"); |
2755 | ssh2_pkt_addbool(1); /* want reply */ |
2756 | ssh2_pkt_addstring(cfg.remote_cmd); |
2757 | } else { |
2758 | ssh2_pkt_addstring("shell"); |
2759 | ssh2_pkt_addbool(1); /* want reply */ |
2760 | } |
7cca0d81 |
2761 | ssh2_pkt_send(); |
d211621f |
2762 | do { |
7cca0d81 |
2763 | crWaitUntilV(ispkt); |
d211621f |
2764 | if (pktin.type == SSH2_MSG_CHANNEL_WINDOW_ADJUST) { |
783415f8 |
2765 | unsigned i = ssh2_pkt_getuint32(); |
2766 | struct ssh_channel *c; |
2767 | c = find234(ssh_channels, &i, ssh_channelfind); |
2768 | if (!c) |
2769 | continue; /* nonexistent channel */ |
2770 | c->v2.remwindow += ssh2_pkt_getuint32(); |
d211621f |
2771 | } |
7cca0d81 |
2772 | } while (pktin.type == SSH2_MSG_CHANNEL_WINDOW_ADJUST); |
2773 | if (pktin.type != SSH2_MSG_CHANNEL_SUCCESS) { |
2774 | if (pktin.type != SSH2_MSG_CHANNEL_FAILURE) { |
8d5de777 |
2775 | bombout(("Server got confused by shell/command request")); |
2776 | crReturnV; |
7cca0d81 |
2777 | } |
8d5de777 |
2778 | bombout(("Server refused to start a shell/command")); |
2779 | crReturnV; |
7cca0d81 |
2780 | } else { |
8d5de777 |
2781 | logevent("Started a shell/command"); |
7cca0d81 |
2782 | } |
2783 | |
6e48c3fe |
2784 | ssh_state = SSH_STATE_SESSION; |
2785 | if (size_needed) |
2786 | ssh_size(); |
3687d221 |
2787 | if (eof_needed) |
2788 | ssh_special(TS_EOF); |
6e48c3fe |
2789 | |
7cca0d81 |
2790 | /* |
2791 | * Transfer data! |
2792 | */ |
8ccc75b0 |
2793 | ssh_send_ok = 1; |
6f34e365 |
2794 | begin_session(); |
7cca0d81 |
2795 | while (1) { |
d211621f |
2796 | static int try_send; |
e5574168 |
2797 | crReturnV; |
d211621f |
2798 | try_send = FALSE; |
7cca0d81 |
2799 | if (ispkt) { |
2800 | if (pktin.type == SSH2_MSG_CHANNEL_DATA || |
2801 | pktin.type == SSH2_MSG_CHANNEL_EXTENDED_DATA) { |
2802 | char *data; |
2803 | int length; |
783415f8 |
2804 | unsigned i = ssh2_pkt_getuint32(); |
2805 | struct ssh_channel *c; |
2806 | c = find234(ssh_channels, &i, ssh_channelfind); |
2807 | if (!c) |
2808 | continue; /* nonexistent channel */ |
7cca0d81 |
2809 | if (pktin.type == SSH2_MSG_CHANNEL_EXTENDED_DATA && |
2810 | ssh2_pkt_getuint32() != SSH2_EXTENDED_DATA_STDERR) |
2811 | continue; /* extended but not stderr */ |
2812 | ssh2_pkt_getstring(&data, &length); |
d211621f |
2813 | if (data) { |
783415f8 |
2814 | switch (c->type) { |
2815 | case CHAN_MAINSESSION: |
2816 | from_backend(pktin.type == SSH2_MSG_CHANNEL_EXTENDED_DATA, |
2817 | data, length); |
2818 | break; |
2819 | case CHAN_X11: |
2820 | x11_send(c->u.x11.s, data, length); |
2821 | break; |
2822 | } |
d211621f |
2823 | /* |
783415f8 |
2824 | * Enlarge the window again at the remote |
2825 | * side, just in case it ever runs down and |
2826 | * they fail to send us any more data. |
d211621f |
2827 | */ |
2828 | ssh2_pkt_init(SSH2_MSG_CHANNEL_WINDOW_ADJUST); |
783415f8 |
2829 | ssh2_pkt_adduint32(c->remoteid); |
d211621f |
2830 | ssh2_pkt_adduint32(length); |
2831 | ssh2_pkt_send(); |
2832 | } |
7cca0d81 |
2833 | } else if (pktin.type == SSH2_MSG_DISCONNECT) { |
2834 | ssh_state = SSH_STATE_CLOSED; |
d211621f |
2835 | logevent("Received disconnect message"); |
3257deae |
2836 | crReturnV; |
7cca0d81 |
2837 | } else if (pktin.type == SSH2_MSG_CHANNEL_REQUEST) { |
2838 | continue; /* exit status et al; ignore (FIXME?) */ |
d211621f |
2839 | } else if (pktin.type == SSH2_MSG_CHANNEL_EOF) { |
783415f8 |
2840 | unsigned i = ssh2_pkt_getuint32(); |
2841 | struct ssh_channel *c; |
2842 | |
2843 | c = find234(ssh_channels, &i, ssh_channelfind); |
2844 | if (!c) |
2845 | continue; /* nonexistent channel */ |
2846 | |
2847 | if (c->type == CHAN_X11) { |
2848 | /* |
2849 | * Remote EOF on an X11 channel means we should |
2850 | * wrap up and close the channel ourselves. |
2851 | */ |
2852 | x11_close(c->u.x11.s); |
2853 | sshfwd_close(c); |
2854 | } |
d211621f |
2855 | } else if (pktin.type == SSH2_MSG_CHANNEL_CLOSE) { |
783415f8 |
2856 | unsigned i = ssh2_pkt_getuint32(); |
2857 | struct ssh_channel *c; |
2858 | enum234 e; |
2859 | |
2860 | c = find234(ssh_channels, &i, ssh_channelfind); |
2861 | if (!c) |
2862 | continue; /* nonexistent channel */ |
2863 | if (c->closes == 0) { |
2864 | ssh2_pkt_init(SSH2_MSG_CHANNEL_CLOSE); |
2865 | ssh2_pkt_adduint32(c->remoteid); |
2866 | ssh2_pkt_send(); |
2867 | } |
2868 | /* Do pre-close processing on the channel. */ |
2869 | switch (c->type) { |
2870 | case CHAN_MAINSESSION: |
2871 | break; /* nothing to see here, move along */ |
2872 | case CHAN_X11: |
2873 | break; |
2874 | } |
2875 | del234(ssh_channels, c); |
2876 | sfree(c->v2.outbuffer); |
2877 | sfree(c); |
2878 | |
2879 | /* |
2880 | * See if that was the last channel left open. |
2881 | */ |
2882 | c = first234(ssh_channels, &e); |
2883 | if (!c) { |
d211621f |
2884 | logevent("All channels closed. Disconnecting"); |
2885 | ssh2_pkt_init(SSH2_MSG_DISCONNECT); |
9005f3ba |
2886 | ssh2_pkt_adduint32(SSH2_DISCONNECT_BY_APPLICATION); |
2887 | ssh2_pkt_addstring("All open channels closed"); |
2888 | ssh2_pkt_addstring("en"); /* language tag */ |
d211621f |
2889 | ssh2_pkt_send(); |
cf6e59d6 |
2890 | ssh_state = SSH_STATE_CLOSED; |
3257deae |
2891 | crReturnV; |
d211621f |
2892 | } |
2893 | continue; /* remote sends close; ignore (FIXME) */ |
7cca0d81 |
2894 | } else if (pktin.type == SSH2_MSG_CHANNEL_WINDOW_ADJUST) { |
783415f8 |
2895 | unsigned i = ssh2_pkt_getuint32(); |
2896 | struct ssh_channel *c; |
2897 | c = find234(ssh_channels, &i, ssh_channelfind); |
2898 | if (!c) |
2899 | continue; /* nonexistent channel */ |
2900 | mainchan->v2.remwindow += ssh2_pkt_getuint32(); |
d211621f |
2901 | try_send = TRUE; |
783415f8 |
2902 | } else if (pktin.type == SSH2_MSG_CHANNEL_OPEN) { |
2903 | char *type; |
2904 | int typelen; |
2905 | char *error = NULL; |
2906 | struct ssh_channel *c; |
2907 | ssh2_pkt_getstring(&type, &typelen); |
2908 | c = smalloc(sizeof(struct ssh_channel)); |
2909 | |
2910 | if (typelen == 3 && !memcmp(type, "x11", 3)) { |
2911 | char *rh; |
2912 | if (!ssh_X11_fwd_enabled) |
2913 | error = "X11 forwarding is not enabled"; |
2914 | else if ( x11_init(&c->u.x11.s, cfg.x11_display, c, &rh) != NULL ) { |
2915 | error = "Unable to open an X11 connection"; |
2916 | } else { |
2917 | c->type = CHAN_X11; |
2918 | } |
2919 | } else { |
2920 | error = "Unsupported channel type requested"; |
2921 | } |
2922 | |
2923 | c->remoteid = ssh2_pkt_getuint32(); |
2924 | if (error) { |
2925 | ssh2_pkt_init(SSH2_MSG_CHANNEL_OPEN_FAILURE); |
2926 | ssh2_pkt_adduint32(c->remoteid); |
2927 | ssh2_pkt_adduint32(SSH2_OPEN_CONNECT_FAILED); |
2928 | ssh2_pkt_addstring(error); |
2929 | ssh2_pkt_addstring("en"); /* language tag */ |
2930 | ssh2_pkt_send(); |
2931 | sfree(c); |
2932 | } else { |
2933 | struct ssh_channel *d; |
2934 | unsigned i; |
2935 | enum234 e; |
2936 | |
2937 | for (i=1, d = first234(ssh_channels, &e); d; |
2938 | d = next234(&e)) { |
2939 | if (d->localid > i) |
2940 | break; /* found a free number */ |
2941 | i = d->localid + 1; |
2942 | } |
2943 | c->localid = i; |
2944 | c->closes = 0; |
2945 | c->v2.remwindow = ssh2_pkt_getuint32(); |
2946 | c->v2.remmaxpkt = ssh2_pkt_getuint32(); |
2947 | c->v2.outbuffer = NULL; |
2948 | c->v2.outbuflen = c->v2.outbufsize = 0; |
2949 | add234(ssh_channels, c); |
2950 | ssh2_pkt_init(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); |
2951 | ssh2_pkt_adduint32(c->remoteid); |
2952 | ssh2_pkt_adduint32(c->localid); |
2953 | ssh2_pkt_adduint32(0x8000UL); /* our window size */ |
2954 | ssh2_pkt_adduint32(0x4000UL); /* our max pkt size */ |
2955 | ssh2_pkt_send(); |
2956 | } |
7cca0d81 |
2957 | } else { |
8d5de777 |
2958 | bombout(("Strange packet received: type %d", pktin.type)); |
2959 | crReturnV; |
7cca0d81 |
2960 | } |
2961 | } else { |
d211621f |
2962 | /* |
2963 | * We have spare data. Add it to the channel buffer. |
2964 | */ |
783415f8 |
2965 | ssh2_add_channel_data(mainchan, in, inlen); |
d211621f |
2966 | try_send = TRUE; |
7cca0d81 |
2967 | } |
d211621f |
2968 | if (try_send) { |
783415f8 |
2969 | enum234 e; |
2970 | struct ssh_channel *c; |
d211621f |
2971 | /* |
783415f8 |
2972 | * Try to send data on all channels if we can. |
d211621f |
2973 | */ |
783415f8 |
2974 | for (c = first234(ssh_channels, &e); c; c = next234(&e)) |
2975 | ssh2_try_send(c); |
d211621f |
2976 | } |
e5574168 |
2977 | } |
2978 | |
2979 | crFinishV; |
2980 | } |
2981 | |
2982 | /* |
7cca0d81 |
2983 | * Handle the top-level SSH2 protocol. |
2984 | */ |
2985 | static void ssh2_protocol(unsigned char *in, int inlen, int ispkt) |
2986 | { |
2987 | if (do_ssh2_transport(in, inlen, ispkt) == 0) |
2988 | return; |
2989 | do_ssh2_authconn(in, inlen, ispkt); |
2990 | } |
2991 | |
2992 | /* |
8df7a775 |
2993 | * Called to set up the connection. |
374330e2 |
2994 | * |
2995 | * Returns an error message, or NULL on success. |
374330e2 |
2996 | */ |
8df7a775 |
2997 | static char *ssh_init (char *host, int port, char **realhost) { |
fb09bf1c |
2998 | char *p; |
8f203108 |
2999 | |
3000 | #ifdef MSCRYPTOAPI |
3001 | if(crypto_startup() == 0) |
3002 | return "Microsoft high encryption pack not installed!"; |
3003 | #endif |
374330e2 |
3004 | |
8df7a775 |
3005 | ssh_send_ok = 0; |
3006 | |
fb09bf1c |
3007 | p = connect_to_host(host, port, realhost); |
3008 | if (p != NULL) |
3009 | return p; |
374330e2 |
3010 | |
374330e2 |
3011 | return NULL; |
3012 | } |
3013 | |
3014 | /* |
374330e2 |
3015 | * Called to send data down the Telnet connection. |
3016 | */ |
3017 | static void ssh_send (char *buf, int len) { |
f78051a1 |
3018 | if (s == NULL || ssh_protocol == NULL) |
374330e2 |
3019 | return; |
3020 | |
3021 | ssh_protocol(buf, len, 0); |
3022 | } |
3023 | |
3024 | /* |
6e48c3fe |
3025 | * Called to set the size of the window from SSH's POV. |
374330e2 |
3026 | */ |
3027 | static void ssh_size(void) { |
3028 | switch (ssh_state) { |
3029 | case SSH_STATE_BEFORE_SIZE: |
3687d221 |
3030 | case SSH_STATE_PREPACKET: |
21248260 |
3031 | case SSH_STATE_CLOSED: |
374330e2 |
3032 | break; /* do nothing */ |
3033 | case SSH_STATE_INTERMED: |
3034 | size_needed = TRUE; /* buffer for later */ |
3035 | break; |
3036 | case SSH_STATE_SESSION: |
fef97f43 |
3037 | if (!cfg.nopty) { |
6e48c3fe |
3038 | if (ssh_version == 1) { |
3039 | send_packet(SSH1_CMSG_WINDOW_SIZE, |
3040 | PKT_INT, rows, PKT_INT, cols, |
3041 | PKT_INT, 0, PKT_INT, 0, PKT_END); |
3042 | } else { |
3043 | ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST); |
3044 | ssh2_pkt_adduint32(mainchan->remoteid); |
3045 | ssh2_pkt_addstring("window-change"); |
3046 | ssh2_pkt_addbool(0); |
3047 | ssh2_pkt_adduint32(cols); |
3048 | ssh2_pkt_adduint32(rows); |
3049 | ssh2_pkt_adduint32(0); |
3050 | ssh2_pkt_adduint32(0); |
3051 | ssh2_pkt_send(); |
3052 | } |
fef97f43 |
3053 | } |
3687d221 |
3054 | break; |
374330e2 |
3055 | } |
3056 | } |
3057 | |
3058 | /* |
6abbf9e3 |
3059 | * Send Telnet special codes. TS_EOF is useful for `plink', so you |
3060 | * can send an EOF and collect resulting output (e.g. `plink |
3061 | * hostname sort'). |
374330e2 |
3062 | */ |
3063 | static void ssh_special (Telnet_Special code) { |
6abbf9e3 |
3064 | if (code == TS_EOF) { |
3687d221 |
3065 | if (ssh_state != SSH_STATE_SESSION) { |
3066 | /* |
3067 | * Buffer the EOF in case we are pre-SESSION, so we can |
3068 | * send it as soon as we reach SESSION. |
3069 | */ |
3070 | if (code == TS_EOF) |
3071 | eof_needed = TRUE; |
3072 | return; |
3073 | } |
67779be7 |
3074 | if (ssh_version == 1) { |
6abbf9e3 |
3075 | send_packet(SSH1_CMSG_EOF, PKT_END); |
3076 | } else { |
3077 | ssh2_pkt_init(SSH2_MSG_CHANNEL_EOF); |
d211621f |
3078 | ssh2_pkt_adduint32(mainchan->remoteid); |
6abbf9e3 |
3079 | ssh2_pkt_send(); |
3080 | } |
67779be7 |
3081 | logevent("Sent EOF message"); |
ec55b220 |
3082 | } else if (code == TS_PING) { |
3687d221 |
3083 | if (ssh_state == SSH_STATE_CLOSED || ssh_state == SSH_STATE_PREPACKET) |
3084 | return; |
ec55b220 |
3085 | if (ssh_version == 1) { |
3086 | send_packet(SSH1_MSG_IGNORE, PKT_STR, "", PKT_END); |
3087 | } else { |
3088 | ssh2_pkt_init(SSH2_MSG_IGNORE); |
3089 | ssh2_pkt_addstring_start(); |
3090 | ssh2_pkt_send(); |
3091 | } |
6abbf9e3 |
3092 | } else { |
3093 | /* do nothing */ |
3094 | } |
374330e2 |
3095 | } |
3096 | |
8df7a775 |
3097 | static Socket ssh_socket(void) { return s; } |
8ccc75b0 |
3098 | |
3099 | static int ssh_sendok(void) { return ssh_send_ok; } |
fb09bf1c |
3100 | |
374330e2 |
3101 | Backend ssh_backend = { |
3102 | ssh_init, |
374330e2 |
3103 | ssh_send, |
3104 | ssh_size, |
4017be6d |
3105 | ssh_special, |
8ccc75b0 |
3106 | ssh_socket, |
97db3be4 |
3107 | ssh_sendok, |
3108 | 22 |
374330e2 |
3109 | }; |