374330e2 |
1 | #include <stdio.h> |
2 | #include <stdlib.h> |
fb09bf1c |
3 | #include <stdarg.h> |
4 | #include <assert.h> |
4d331a77 |
5 | #ifndef AUTO_WINSOCK |
6 | #ifdef WINSOCK_TWO |
7 | #include <winsock2.h> |
8 | #else |
374330e2 |
9 | #include <winsock.h> |
4d331a77 |
10 | #endif |
11 | #endif |
374330e2 |
12 | |
13 | #include "putty.h" |
dacbd0e8 |
14 | #include "tree234.h" |
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15 | #include "ssh.h" |
374330e2 |
16 | |
17 | #ifndef FALSE |
18 | #define FALSE 0 |
19 | #endif |
20 | #ifndef TRUE |
21 | #define TRUE 1 |
22 | #endif |
23 | |
fb09bf1c |
24 | #define logevent(s) { logevent(s); \ |
67779be7 |
25 | if ((flags & FLAG_STDERR) && (flags & FLAG_VERBOSE)) \ |
fb09bf1c |
26 | fprintf(stderr, "%s\n", s); } |
27 | |
8d5de777 |
28 | #define bombout(msg) ( ssh_state == SSH_STATE_CLOSED, closesocket(s), \ |
29 | s = INVALID_SOCKET, connection_fatal msg ) |
30 | |
d211621f |
31 | #define SSH1_MSG_DISCONNECT 1 /* 0x1 */ |
32 | #define SSH1_SMSG_PUBLIC_KEY 2 /* 0x2 */ |
33 | #define SSH1_CMSG_SESSION_KEY 3 /* 0x3 */ |
34 | #define SSH1_CMSG_USER 4 /* 0x4 */ |
35 | #define SSH1_CMSG_AUTH_RSA 6 /* 0x6 */ |
36 | #define SSH1_SMSG_AUTH_RSA_CHALLENGE 7 /* 0x7 */ |
37 | #define SSH1_CMSG_AUTH_RSA_RESPONSE 8 /* 0x8 */ |
38 | #define SSH1_CMSG_AUTH_PASSWORD 9 /* 0x9 */ |
39 | #define SSH1_CMSG_REQUEST_PTY 10 /* 0xa */ |
40 | #define SSH1_CMSG_WINDOW_SIZE 11 /* 0xb */ |
41 | #define SSH1_CMSG_EXEC_SHELL 12 /* 0xc */ |
42 | #define SSH1_CMSG_EXEC_CMD 13 /* 0xd */ |
43 | #define SSH1_SMSG_SUCCESS 14 /* 0xe */ |
44 | #define SSH1_SMSG_FAILURE 15 /* 0xf */ |
45 | #define SSH1_CMSG_STDIN_DATA 16 /* 0x10 */ |
46 | #define SSH1_SMSG_STDOUT_DATA 17 /* 0x11 */ |
47 | #define SSH1_SMSG_STDERR_DATA 18 /* 0x12 */ |
48 | #define SSH1_CMSG_EOF 19 /* 0x13 */ |
49 | #define SSH1_SMSG_EXIT_STATUS 20 /* 0x14 */ |
50 | #define SSH1_MSG_CHANNEL_OPEN_CONFIRMATION 21 /* 0x15 */ |
51 | #define SSH1_MSG_CHANNEL_OPEN_FAILURE 22 /* 0x16 */ |
52 | #define SSH1_MSG_CHANNEL_DATA 23 /* 0x17 */ |
53 | #define SSH1_MSG_CHANNEL_CLOSE 24 /* 0x18 */ |
54 | #define SSH1_MSG_CHANNEL_CLOSE_CONFIRMATION 25 /* 0x19 */ |
55 | #define SSH1_CMSG_AGENT_REQUEST_FORWARDING 30 /* 0x1e */ |
56 | #define SSH1_SMSG_AGENT_OPEN 31 /* 0x1f */ |
57 | #define SSH1_CMSG_EXIT_CONFIRMATION 33 /* 0x21 */ |
58 | #define SSH1_MSG_IGNORE 32 /* 0x20 */ |
59 | #define SSH1_MSG_DEBUG 36 /* 0x24 */ |
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 | |
110 | #define SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED 1 /* 0x1 */ |
111 | #define SSH2_OPEN_CONNECT_FAILED 2 /* 0x2 */ |
112 | #define SSH2_OPEN_UNKNOWN_CHANNEL_TYPE 3 /* 0x3 */ |
113 | #define SSH2_OPEN_RESOURCE_SHORTAGE 4 /* 0x4 */ |
114 | |
115 | #define SSH2_EXTENDED_DATA_STDERR 1 /* 0x1 */ |
fb09bf1c |
116 | |
117 | #define GET_32BIT(cp) \ |
118 | (((unsigned long)(unsigned char)(cp)[0] << 24) | \ |
119 | ((unsigned long)(unsigned char)(cp)[1] << 16) | \ |
120 | ((unsigned long)(unsigned char)(cp)[2] << 8) | \ |
121 | ((unsigned long)(unsigned char)(cp)[3])) |
122 | |
123 | #define PUT_32BIT(cp, value) { \ |
124 | (cp)[0] = (unsigned char)((value) >> 24); \ |
125 | (cp)[1] = (unsigned char)((value) >> 16); \ |
126 | (cp)[2] = (unsigned char)((value) >> 8); \ |
127 | (cp)[3] = (unsigned char)(value); } |
128 | |
7cca0d81 |
129 | enum { PKT_END, PKT_INT, PKT_CHAR, PKT_DATA, PKT_STR, PKT_BIGNUM }; |
972a41c8 |
130 | |
374330e2 |
131 | /* Coroutine mechanics for the sillier bits of the code */ |
132 | #define crBegin1 static int crLine = 0; |
133 | #define crBegin2 switch(crLine) { case 0:; |
134 | #define crBegin crBegin1; crBegin2; |
135 | #define crFinish(z) } crLine = 0; return (z) |
136 | #define crFinishV } crLine = 0; return |
137 | #define crReturn(z) \ |
138 | do {\ |
139 | crLine=__LINE__; return (z); case __LINE__:;\ |
140 | } while (0) |
141 | #define crReturnV \ |
142 | do {\ |
143 | crLine=__LINE__; return; case __LINE__:;\ |
144 | } while (0) |
145 | #define crStop(z) do{ crLine = 0; return (z); }while(0) |
146 | #define crStopV do{ crLine = 0; return; }while(0) |
fb09bf1c |
147 | #define crWaitUntil(c) do { crReturn(0); } while (!(c)) |
7cca0d81 |
148 | #define crWaitUntilV(c) do { crReturnV; } while (!(c)) |
374330e2 |
149 | |
57476f6b |
150 | extern const struct ssh_cipher ssh_3des; |
151 | extern const struct ssh_cipher ssh_3des_ssh2; |
152 | extern const struct ssh_cipher ssh_des; |
153 | extern const struct ssh_cipher ssh_blowfish_ssh1; |
154 | extern const struct ssh_cipher ssh_blowfish_ssh2; |
e5574168 |
155 | |
5e8358ad |
156 | /* |
157 | * Ciphers for SSH2. We miss out single-DES because it isn't |
158 | * supported; also 3DES and Blowfish are both done differently from |
159 | * SSH1. (3DES uses outer chaining; Blowfish has the opposite |
160 | * endianness and different-sized keys.) |
5e8358ad |
161 | */ |
57476f6b |
162 | const static struct ssh_cipher *ciphers[] = { &ssh_blowfish_ssh2, &ssh_3des_ssh2 }; |
e5574168 |
163 | |
57476f6b |
164 | extern const struct ssh_kex ssh_diffiehellman; |
165 | const static struct ssh_kex *kex_algs[] = { &ssh_diffiehellman }; |
e5574168 |
166 | |
57476f6b |
167 | extern const struct ssh_hostkey ssh_dss; |
168 | const static struct ssh_hostkey *hostkey_algs[] = { &ssh_dss }; |
e5574168 |
169 | |
57476f6b |
170 | extern const struct ssh_mac ssh_sha1; |
e5574168 |
171 | |
d39f364a |
172 | static void nullmac_key(unsigned char *key) { } |
e5574168 |
173 | static void nullmac_generate(unsigned char *blk, int len, unsigned long seq) { } |
174 | static int nullmac_verify(unsigned char *blk, int len, unsigned long seq) { return 1; } |
57476f6b |
175 | const static struct ssh_mac ssh_mac_none = { |
d39f364a |
176 | nullmac_key, nullmac_key, nullmac_generate, nullmac_verify, "none", 0 |
e5574168 |
177 | }; |
57476f6b |
178 | const static struct ssh_mac *macs[] = { &ssh_sha1, &ssh_mac_none }; |
e5574168 |
179 | |
57476f6b |
180 | const static struct ssh_compress ssh_comp_none = { |
e5574168 |
181 | "none" |
182 | }; |
57476f6b |
183 | const static struct ssh_compress *compressions[] = { &ssh_comp_none }; |
374330e2 |
184 | |
dacbd0e8 |
185 | /* |
186 | * 2-3-4 tree storing channels. |
187 | */ |
188 | struct ssh_channel { |
d211621f |
189 | unsigned remoteid, localid; |
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190 | int type; |
191 | int closes; |
192 | union { |
193 | struct ssh_agent_channel { |
194 | unsigned char *message; |
195 | unsigned char msglen[4]; |
196 | int lensofar, totallen; |
197 | } a; |
d211621f |
198 | struct ssh2_data_channel { |
199 | unsigned char *outbuffer; |
200 | unsigned outbuflen, outbufsize; |
201 | unsigned remwindow, remmaxpkt; |
202 | } v2; |
dacbd0e8 |
203 | } u; |
204 | }; |
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205 | |
206 | struct Packet { |
207 | long length; |
208 | int type; |
209 | unsigned char *data; |
210 | unsigned char *body; |
211 | long savedpos; |
212 | long maxlen; |
213 | }; |
214 | |
215 | static SHA_State exhash; |
216 | |
217 | static SOCKET s = INVALID_SOCKET; |
218 | |
219 | static unsigned char session_key[32]; |
220 | static const struct ssh_cipher *cipher = NULL; |
221 | static const struct ssh_cipher *cscipher = NULL; |
222 | static const struct ssh_cipher *sccipher = NULL; |
223 | static const struct ssh_mac *csmac = NULL; |
224 | static const struct ssh_mac *scmac = NULL; |
225 | static const struct ssh_compress *cscomp = NULL; |
226 | static const struct ssh_compress *sccomp = NULL; |
227 | static const struct ssh_kex *kex = NULL; |
228 | static const struct ssh_hostkey *hostkey = NULL; |
229 | int (*ssh_get_password)(const char *prompt, char *str, int maxlen) = NULL; |
230 | |
231 | static char *savedhost; |
232 | static int savedport; |
233 | static int ssh_send_ok; |
234 | |
dacbd0e8 |
235 | static tree234 *ssh_channels; /* indexed by local id */ |
57476f6b |
236 | static struct ssh_channel *mainchan; /* primary session channel */ |
237 | |
238 | static enum { |
239 | SSH_STATE_BEFORE_SIZE, |
240 | SSH_STATE_INTERMED, |
241 | SSH_STATE_SESSION, |
242 | SSH_STATE_CLOSED |
243 | } ssh_state = SSH_STATE_BEFORE_SIZE; |
244 | |
245 | static int size_needed = FALSE; |
246 | |
247 | static struct Packet pktin = { 0, 0, NULL, NULL, 0 }; |
248 | static struct Packet pktout = { 0, 0, NULL, NULL, 0 }; |
249 | |
250 | static int ssh_version; |
251 | static void (*ssh_protocol)(unsigned char *in, int inlen, int ispkt); |
252 | static void ssh1_protocol(unsigned char *in, int inlen, int ispkt); |
253 | static void ssh2_protocol(unsigned char *in, int inlen, int ispkt); |
254 | static void ssh_size(void); |
255 | |
256 | static int (*s_rdpkt)(unsigned char **data, int *datalen); |
257 | |
258 | static struct rdpkt1_state_tag { |
259 | long len, pad, biglen, to_read; |
260 | unsigned long realcrc, gotcrc; |
261 | unsigned char *p; |
262 | int i; |
263 | int chunk; |
264 | } rdpkt1_state; |
265 | |
dacbd0e8 |
266 | static int ssh_channelcmp(void *av, void *bv) { |
267 | struct ssh_channel *a = (struct ssh_channel *)av; |
268 | struct ssh_channel *b = (struct ssh_channel *)bv; |
269 | if (a->localid < b->localid) return -1; |
270 | if (a->localid > b->localid) return +1; |
271 | return 0; |
272 | } |
273 | static int ssh_channelfind(void *av, void *bv) { |
d211621f |
274 | unsigned *a = (unsigned *)av; |
dacbd0e8 |
275 | struct ssh_channel *b = (struct ssh_channel *)bv; |
276 | if (*a < b->localid) return -1; |
277 | if (*a > b->localid) return +1; |
278 | return 0; |
279 | } |
280 | |
374330e2 |
281 | static void s_write (char *buf, int len) { |
282 | while (len > 0) { |
283 | int i = send (s, buf, len, 0); |
4017be6d |
284 | noise_ultralight(i); |
8d5de777 |
285 | if (i <= 0) { |
286 | bombout(("Lost connection while sending")); |
287 | return; |
288 | } |
374330e2 |
289 | if (i > 0) |
290 | len -= i, buf += i; |
291 | } |
292 | } |
293 | |
294 | static int s_read (char *buf, int len) { |
295 | int ret = 0; |
296 | while (len > 0) { |
297 | int i = recv (s, buf, len, 0); |
4017be6d |
298 | noise_ultralight(i); |
374330e2 |
299 | if (i > 0) |
300 | len -= i, buf += i, ret += i; |
301 | else |
302 | return i; |
303 | } |
304 | return ret; |
305 | } |
306 | |
307 | static void c_write (char *buf, int len) { |
67779be7 |
308 | if ((flags & FLAG_STDERR)) { |
4017be6d |
309 | int i; |
310 | for (i = 0; i < len; i++) |
311 | if (buf[i] != '\r') |
312 | fputc(buf[i], stderr); |
fb09bf1c |
313 | return; |
314 | } |
c9def1b8 |
315 | while (len--) |
316 | c_write1(*buf++); |
374330e2 |
317 | } |
318 | |
3bdaf79d |
319 | static void c_writedata (char *buf, int len) { |
320 | while (len--) |
321 | c_write1(*buf++); |
322 | } |
323 | |
fb09bf1c |
324 | /* |
325 | * Collect incoming data in the incoming packet buffer. |
e5574168 |
326 | * Decipher and verify the packet when it is completely read. |
327 | * Drop SSH1_MSG_DEBUG and SSH1_MSG_IGNORE packets. |
fb09bf1c |
328 | * Update the *data and *datalen variables. |
329 | * Return the additional nr of bytes needed, or 0 when |
330 | * a complete packet is available. |
331 | */ |
e5574168 |
332 | static int ssh1_rdpkt(unsigned char **data, int *datalen) |
fb09bf1c |
333 | { |
57476f6b |
334 | struct rdpkt1_state_tag *st = &rdpkt1_state; |
374330e2 |
335 | |
336 | crBegin; |
374330e2 |
337 | |
fb09bf1c |
338 | next_packet: |
37508af4 |
339 | |
fb09bf1c |
340 | pktin.type = 0; |
341 | pktin.length = 0; |
374330e2 |
342 | |
57476f6b |
343 | for (st->i = st->len = 0; st->i < 4; st->i++) { |
fb09bf1c |
344 | while ((*datalen) == 0) |
57476f6b |
345 | crReturn(4-st->i); |
346 | st->len = (st->len << 8) + **data; |
fb09bf1c |
347 | (*data)++, (*datalen)--; |
348 | } |
374330e2 |
349 | |
fb09bf1c |
350 | #ifdef FWHACK |
57476f6b |
351 | if (st->len == 0x52656d6f) { /* "Remo"te server has closed ... */ |
352 | st->len = 0x300; /* big enough to carry to end */ |
fb09bf1c |
353 | } |
354 | #endif |
374330e2 |
355 | |
57476f6b |
356 | st->pad = 8 - (st->len % 8); |
357 | st->biglen = st->len + st->pad; |
358 | pktin.length = st->len - 5; |
fb09bf1c |
359 | |
57476f6b |
360 | if (pktin.maxlen < st->biglen) { |
361 | pktin.maxlen = st->biglen; |
362 | pktin.data = (pktin.data == NULL ? malloc(st->biglen+APIEXTRA) : |
363 | realloc(pktin.data, st->biglen+APIEXTRA)); |
fb09bf1c |
364 | if (!pktin.data) |
365 | fatalbox("Out of memory"); |
366 | } |
374330e2 |
367 | |
57476f6b |
368 | st->to_read = st->biglen; |
369 | st->p = pktin.data; |
370 | while (st->to_read > 0) { |
371 | st->chunk = st->to_read; |
fb09bf1c |
372 | while ((*datalen) == 0) |
57476f6b |
373 | crReturn(st->to_read); |
374 | if (st->chunk > (*datalen)) |
375 | st->chunk = (*datalen); |
376 | memcpy(st->p, *data, st->chunk); |
377 | *data += st->chunk; |
378 | *datalen -= st->chunk; |
379 | st->p += st->chunk; |
380 | st->to_read -= st->chunk; |
fb09bf1c |
381 | } |
374330e2 |
382 | |
fb09bf1c |
383 | if (cipher) |
57476f6b |
384 | cipher->decrypt(pktin.data, st->biglen); |
374330e2 |
385 | |
57476f6b |
386 | pktin.type = pktin.data[st->pad]; |
387 | pktin.body = pktin.data + st->pad + 1; |
374330e2 |
388 | |
57476f6b |
389 | st->realcrc = crc32(pktin.data, st->biglen-4); |
390 | st->gotcrc = GET_32BIT(pktin.data+st->biglen-4); |
391 | if (st->gotcrc != st->realcrc) { |
8d5de777 |
392 | bombout(("Incorrect CRC received on packet")); |
393 | crReturn(0); |
fb09bf1c |
394 | } |
572f871e |
395 | |
e5574168 |
396 | if (pktin.type == SSH1_SMSG_STDOUT_DATA || |
397 | pktin.type == SSH1_SMSG_STDERR_DATA || |
398 | pktin.type == SSH1_MSG_DEBUG || |
18515c51 |
399 | pktin.type == SSH1_SMSG_AUTH_TIS_CHALLENGE || |
400 | pktin.type == SSH1_SMSG_AUTH_CCARD_CHALLENGE) { |
fb09bf1c |
401 | long strlen = GET_32BIT(pktin.body); |
8d5de777 |
402 | if (strlen + 4 != pktin.length) { |
403 | bombout(("Received data packet with bogus string length")); |
404 | crReturn(0); |
405 | } |
fb09bf1c |
406 | } |
407 | |
e5574168 |
408 | if (pktin.type == SSH1_MSG_DEBUG) { |
fb09bf1c |
409 | /* log debug message */ |
410 | char buf[80]; |
411 | int strlen = GET_32BIT(pktin.body); |
412 | strcpy(buf, "Remote: "); |
413 | if (strlen > 70) strlen = 70; |
414 | memcpy(buf+8, pktin.body+4, strlen); |
415 | buf[8+strlen] = '\0'; |
416 | logevent(buf); |
417 | goto next_packet; |
e5574168 |
418 | } else if (pktin.type == SSH1_MSG_IGNORE) { |
fb09bf1c |
419 | /* do nothing */ |
420 | goto next_packet; |
421 | } |
422 | |
423 | crFinish(0); |
424 | } |
425 | |
e5574168 |
426 | static int ssh2_rdpkt(unsigned char **data, int *datalen) |
427 | { |
428 | static long len, pad, payload, packetlen, maclen; |
429 | static int i; |
430 | static int cipherblk; |
431 | static unsigned long incoming_sequence = 0; |
432 | |
433 | crBegin; |
434 | |
435 | next_packet: |
436 | |
437 | pktin.type = 0; |
438 | pktin.length = 0; |
439 | |
440 | if (cipher) |
441 | cipherblk = cipher->blksize; |
442 | else |
443 | cipherblk = 8; |
444 | if (cipherblk < 8) |
445 | cipherblk = 8; |
446 | |
447 | if (pktin.maxlen < cipherblk) { |
448 | pktin.maxlen = cipherblk; |
449 | pktin.data = (pktin.data == NULL ? malloc(cipherblk+APIEXTRA) : |
450 | realloc(pktin.data, cipherblk+APIEXTRA)); |
451 | if (!pktin.data) |
452 | fatalbox("Out of memory"); |
453 | } |
454 | |
455 | /* |
456 | * Acquire and decrypt the first block of the packet. This will |
457 | * contain the length and padding details. |
458 | */ |
459 | for (i = len = 0; i < cipherblk; i++) { |
460 | while ((*datalen) == 0) |
461 | crReturn(cipherblk-i); |
462 | pktin.data[i] = *(*data)++; |
463 | (*datalen)--; |
464 | } |
465 | #ifdef FWHACK |
466 | if (!memcmp(pktin.data, "Remo", 4)) {/* "Remo"te server has closed ... */ |
467 | /* FIXME */ |
468 | } |
469 | #endif |
470 | if (sccipher) |
471 | sccipher->decrypt(pktin.data, cipherblk); |
472 | |
473 | /* |
474 | * Now get the length and padding figures. |
475 | */ |
476 | len = GET_32BIT(pktin.data); |
477 | pad = pktin.data[4]; |
478 | |
479 | /* |
480 | * This enables us to deduce the payload length. |
481 | */ |
482 | payload = len - pad - 1; |
483 | |
484 | pktin.length = payload + 5; |
485 | |
486 | /* |
487 | * So now we can work out the total packet length. |
488 | */ |
489 | packetlen = len + 4; |
490 | maclen = scmac ? scmac->len : 0; |
491 | |
492 | /* |
493 | * Adjust memory allocation if packet is too big. |
494 | */ |
59dcd2a8 |
495 | if (pktin.maxlen < packetlen+maclen) { |
496 | pktin.maxlen = packetlen+maclen; |
497 | pktin.data = (pktin.data == NULL ? malloc(pktin.maxlen+APIEXTRA) : |
498 | realloc(pktin.data, pktin.maxlen+APIEXTRA)); |
e5574168 |
499 | if (!pktin.data) |
500 | fatalbox("Out of memory"); |
501 | } |
502 | |
503 | /* |
504 | * Read and decrypt the remainder of the packet. |
505 | */ |
506 | for (i = cipherblk; i < packetlen + maclen; i++) { |
507 | while ((*datalen) == 0) |
508 | crReturn(packetlen + maclen - i); |
509 | pktin.data[i] = *(*data)++; |
510 | (*datalen)--; |
511 | } |
512 | /* Decrypt everything _except_ the MAC. */ |
513 | if (sccipher) |
514 | sccipher->decrypt(pktin.data + cipherblk, packetlen - cipherblk); |
515 | |
7cca0d81 |
516 | #if 0 |
d39f364a |
517 | debug(("Got packet len=%d pad=%d\r\n", len, pad)); |
518 | for (i = 0; i < packetlen; i++) |
519 | debug((" %02x", (unsigned char)pktin.data[i])); |
520 | debug(("\r\n")); |
7cca0d81 |
521 | #endif |
d39f364a |
522 | |
e5574168 |
523 | /* |
524 | * Check the MAC. |
525 | */ |
8d5de777 |
526 | if (scmac && !scmac->verify(pktin.data, len+4, incoming_sequence)) { |
527 | bombout(("Incorrect MAC received on packet")); |
528 | crReturn(0); |
529 | } |
033b4cef |
530 | incoming_sequence++; /* whether or not we MACed */ |
e5574168 |
531 | |
532 | pktin.savedpos = 6; |
533 | pktin.type = pktin.data[5]; |
e5574168 |
534 | |
7cca0d81 |
535 | if (pktin.type == SSH2_MSG_IGNORE || pktin.type == SSH2_MSG_DEBUG) |
536 | goto next_packet; /* FIXME: print DEBUG message */ |
e5574168 |
537 | |
538 | crFinish(0); |
539 | } |
540 | |
fb09bf1c |
541 | static void ssh_gotdata(unsigned char *data, int datalen) |
542 | { |
543 | while (datalen > 0) { |
85ee8208 |
544 | if ( s_rdpkt(&data, &datalen) == 0 ) { |
374330e2 |
545 | ssh_protocol(NULL, 0, 1); |
85ee8208 |
546 | if (ssh_state == SSH_STATE_CLOSED) { |
547 | return; |
548 | } |
549 | } |
374330e2 |
550 | } |
374330e2 |
551 | } |
552 | |
fb09bf1c |
553 | |
374330e2 |
554 | static void s_wrpkt_start(int type, int len) { |
555 | int pad, biglen; |
556 | |
557 | len += 5; /* type and CRC */ |
558 | pad = 8 - (len%8); |
559 | biglen = len + pad; |
560 | |
561 | pktout.length = len-5; |
562 | if (pktout.maxlen < biglen) { |
563 | pktout.maxlen = biglen; |
8f203108 |
564 | #ifdef MSCRYPTOAPI |
fb09bf1c |
565 | /* Allocate enough buffer space for extra block |
8f203108 |
566 | * for MS CryptEncrypt() */ |
fb09bf1c |
567 | pktout.data = (pktout.data == NULL ? malloc(biglen+12) : |
568 | realloc(pktout.data, biglen+12)); |
8f203108 |
569 | #else |
c1f5f956 |
570 | pktout.data = (pktout.data == NULL ? malloc(biglen+4) : |
571 | realloc(pktout.data, biglen+4)); |
8f203108 |
572 | #endif |
374330e2 |
573 | if (!pktout.data) |
574 | fatalbox("Out of memory"); |
575 | } |
576 | |
577 | pktout.type = type; |
578 | pktout.body = pktout.data+4+pad+1; |
579 | } |
580 | |
581 | static void s_wrpkt(void) { |
582 | int pad, len, biglen, i; |
583 | unsigned long crc; |
584 | |
585 | len = pktout.length + 5; /* type and CRC */ |
586 | pad = 8 - (len%8); |
587 | biglen = len + pad; |
588 | |
589 | pktout.body[-1] = pktout.type; |
590 | for (i=0; i<pad; i++) |
591 | pktout.data[i+4] = random_byte(); |
592 | crc = crc32(pktout.data+4, biglen-4); |
fb09bf1c |
593 | PUT_32BIT(pktout.data+biglen, crc); |
594 | PUT_32BIT(pktout.data, len); |
374330e2 |
595 | |
596 | if (cipher) |
597 | cipher->encrypt(pktout.data+4, biglen); |
598 | |
599 | s_write(pktout.data, biglen+4); |
600 | } |
601 | |
fb09bf1c |
602 | /* |
603 | * Construct a packet with the specified contents and |
604 | * send it to the server. |
605 | */ |
606 | static void send_packet(int pkttype, ...) |
607 | { |
608 | va_list args; |
609 | unsigned char *p, *argp, argchar; |
610 | unsigned long argint; |
611 | int pktlen, argtype, arglen; |
7cca0d81 |
612 | Bignum bn; |
fb09bf1c |
613 | |
614 | pktlen = 0; |
615 | va_start(args, pkttype); |
616 | while ((argtype = va_arg(args, int)) != PKT_END) { |
617 | switch (argtype) { |
618 | case PKT_INT: |
619 | (void) va_arg(args, int); |
620 | pktlen += 4; |
621 | break; |
622 | case PKT_CHAR: |
623 | (void) va_arg(args, char); |
624 | pktlen++; |
625 | break; |
626 | case PKT_DATA: |
627 | (void) va_arg(args, unsigned char *); |
628 | arglen = va_arg(args, int); |
629 | pktlen += arglen; |
630 | break; |
631 | case PKT_STR: |
632 | argp = va_arg(args, unsigned char *); |
633 | arglen = strlen(argp); |
634 | pktlen += 4 + arglen; |
635 | break; |
7cca0d81 |
636 | case PKT_BIGNUM: |
637 | bn = va_arg(args, Bignum); |
5c58ad2d |
638 | pktlen += ssh1_bignum_length(bn); |
7cca0d81 |
639 | break; |
fb09bf1c |
640 | default: |
641 | assert(0); |
642 | } |
643 | } |
644 | va_end(args); |
645 | |
646 | s_wrpkt_start(pkttype, pktlen); |
647 | p = pktout.body; |
648 | |
649 | va_start(args, pkttype); |
650 | while ((argtype = va_arg(args, int)) != PKT_END) { |
651 | switch (argtype) { |
652 | case PKT_INT: |
653 | argint = va_arg(args, int); |
654 | PUT_32BIT(p, argint); |
655 | p += 4; |
656 | break; |
657 | case PKT_CHAR: |
658 | argchar = va_arg(args, unsigned char); |
659 | *p = argchar; |
660 | p++; |
661 | break; |
662 | case PKT_DATA: |
663 | argp = va_arg(args, unsigned char *); |
664 | arglen = va_arg(args, int); |
665 | memcpy(p, argp, arglen); |
666 | p += arglen; |
667 | break; |
668 | case PKT_STR: |
669 | argp = va_arg(args, unsigned char *); |
670 | arglen = strlen(argp); |
671 | PUT_32BIT(p, arglen); |
672 | memcpy(p + 4, argp, arglen); |
673 | p += 4 + arglen; |
674 | break; |
7cca0d81 |
675 | case PKT_BIGNUM: |
676 | bn = va_arg(args, Bignum); |
5c58ad2d |
677 | p += ssh1_write_bignum(p, bn); |
7cca0d81 |
678 | break; |
fb09bf1c |
679 | } |
680 | } |
681 | va_end(args); |
682 | |
683 | s_wrpkt(); |
684 | } |
685 | |
686 | |
687 | /* |
688 | * Connect to specified host and port. |
689 | * Returns an error message, or NULL on success. |
690 | * Also places the canonical host name into `realhost'. |
691 | */ |
692 | static char *connect_to_host(char *host, int port, char **realhost) |
693 | { |
694 | SOCKADDR_IN addr; |
695 | struct hostent *h; |
696 | unsigned long a; |
697 | #ifdef FWHACK |
698 | char *FWhost; |
699 | int FWport; |
700 | #endif |
701 | |
702 | savedhost = malloc(1+strlen(host)); |
703 | if (!savedhost) |
704 | fatalbox("Out of memory"); |
705 | strcpy(savedhost, host); |
706 | |
707 | if (port < 0) |
708 | port = 22; /* default ssh port */ |
d4857987 |
709 | savedport = port; |
fb09bf1c |
710 | |
711 | #ifdef FWHACK |
712 | FWhost = host; |
713 | FWport = port; |
714 | host = FWSTR; |
715 | port = 23; |
716 | #endif |
717 | |
718 | /* |
719 | * Try to find host. |
720 | */ |
721 | if ( (a = inet_addr(host)) == (unsigned long) INADDR_NONE) { |
722 | if ( (h = gethostbyname(host)) == NULL) |
723 | switch (WSAGetLastError()) { |
724 | case WSAENETDOWN: return "Network is down"; |
725 | case WSAHOST_NOT_FOUND: case WSANO_DATA: |
726 | return "Host does not exist"; |
727 | case WSATRY_AGAIN: return "Host not found"; |
728 | default: return "gethostbyname: unknown error"; |
729 | } |
730 | memcpy (&a, h->h_addr, sizeof(a)); |
731 | *realhost = h->h_name; |
732 | } else |
733 | *realhost = host; |
734 | #ifdef FWHACK |
735 | *realhost = FWhost; |
736 | #endif |
737 | a = ntohl(a); |
738 | |
739 | /* |
740 | * Open socket. |
741 | */ |
742 | s = socket(AF_INET, SOCK_STREAM, 0); |
743 | if (s == INVALID_SOCKET) |
744 | switch (WSAGetLastError()) { |
745 | case WSAENETDOWN: return "Network is down"; |
746 | case WSAEAFNOSUPPORT: return "TCP/IP support not present"; |
747 | default: return "socket(): unknown error"; |
748 | } |
749 | |
750 | /* |
751 | * Bind to local address. |
752 | */ |
753 | addr.sin_family = AF_INET; |
754 | addr.sin_addr.s_addr = htonl(INADDR_ANY); |
755 | addr.sin_port = htons(0); |
756 | if (bind (s, (struct sockaddr *)&addr, sizeof(addr)) == SOCKET_ERROR) |
757 | switch (WSAGetLastError()) { |
758 | case WSAENETDOWN: return "Network is down"; |
759 | default: return "bind(): unknown error"; |
760 | } |
761 | |
762 | /* |
763 | * Connect to remote address. |
764 | */ |
765 | addr.sin_addr.s_addr = htonl(a); |
766 | addr.sin_port = htons((short)port); |
767 | if (connect (s, (struct sockaddr *)&addr, sizeof(addr)) == SOCKET_ERROR) |
768 | switch (WSAGetLastError()) { |
769 | case WSAENETDOWN: return "Network is down"; |
770 | case WSAECONNREFUSED: return "Connection refused"; |
771 | case WSAENETUNREACH: return "Network is unreachable"; |
772 | case WSAEHOSTUNREACH: return "No route to host"; |
773 | default: return "connect(): unknown error"; |
774 | } |
775 | |
776 | #ifdef FWHACK |
777 | send(s, "connect ", 8, 0); |
778 | send(s, FWhost, strlen(FWhost), 0); |
779 | { |
780 | char buf[20]; |
781 | sprintf(buf, " %d\n", FWport); |
782 | send (s, buf, strlen(buf), 0); |
783 | } |
784 | #endif |
785 | |
786 | return NULL; |
787 | } |
788 | |
9697bfd2 |
789 | static int ssh_versioncmp(char *a, char *b) { |
790 | char *ae, *be; |
791 | unsigned long av, bv; |
792 | |
43aa02a7 |
793 | av = strtoul(a, &ae, 10); |
794 | bv = strtoul(b, &be, 10); |
9697bfd2 |
795 | if (av != bv) return (av < bv ? -1 : +1); |
796 | if (*ae == '.') ae++; |
797 | if (*be == '.') be++; |
43aa02a7 |
798 | av = strtoul(ae, &ae, 10); |
799 | bv = strtoul(be, &be, 10); |
9697bfd2 |
800 | if (av != bv) return (av < bv ? -1 : +1); |
801 | return 0; |
802 | } |
803 | |
e5574168 |
804 | |
805 | /* |
806 | * Utility routine for putting an SSH-protocol `string' into a SHA |
807 | * state. |
808 | */ |
809 | #include <stdio.h> |
810 | void sha_string(SHA_State *s, void *str, int len) { |
811 | unsigned char lenblk[4]; |
e5574168 |
812 | PUT_32BIT(lenblk, len); |
e5574168 |
813 | SHA_Bytes(s, lenblk, 4); |
e5574168 |
814 | SHA_Bytes(s, str, len); |
815 | } |
816 | |
7cca0d81 |
817 | /* |
818 | * SSH2 packet construction functions. |
819 | */ |
820 | void ssh2_pkt_adddata(void *data, int len) { |
821 | pktout.length += len; |
822 | if (pktout.maxlen < pktout.length) { |
823 | pktout.maxlen = pktout.length + 256; |
824 | pktout.data = (pktout.data == NULL ? malloc(pktout.maxlen+APIEXTRA) : |
825 | realloc(pktout.data, pktout.maxlen+APIEXTRA)); |
826 | if (!pktout.data) |
827 | fatalbox("Out of memory"); |
828 | } |
829 | memcpy(pktout.data+pktout.length-len, data, len); |
830 | } |
831 | void ssh2_pkt_addbyte(unsigned char byte) { |
832 | ssh2_pkt_adddata(&byte, 1); |
833 | } |
834 | void ssh2_pkt_init(int pkt_type) { |
835 | pktout.length = 5; |
836 | ssh2_pkt_addbyte((unsigned char)pkt_type); |
837 | } |
838 | void ssh2_pkt_addbool(unsigned char value) { |
839 | ssh2_pkt_adddata(&value, 1); |
840 | } |
841 | void ssh2_pkt_adduint32(unsigned long value) { |
842 | unsigned char x[4]; |
843 | PUT_32BIT(x, value); |
844 | ssh2_pkt_adddata(x, 4); |
845 | } |
846 | void ssh2_pkt_addstring_start(void) { |
847 | ssh2_pkt_adduint32(0); |
848 | pktout.savedpos = pktout.length; |
849 | } |
850 | void ssh2_pkt_addstring_str(char *data) { |
851 | ssh2_pkt_adddata(data, strlen(data)); |
852 | PUT_32BIT(pktout.data + pktout.savedpos - 4, |
853 | pktout.length - pktout.savedpos); |
854 | } |
855 | void ssh2_pkt_addstring_data(char *data, int len) { |
856 | ssh2_pkt_adddata(data, len); |
857 | PUT_32BIT(pktout.data + pktout.savedpos - 4, |
858 | pktout.length - pktout.savedpos); |
859 | } |
860 | void ssh2_pkt_addstring(char *data) { |
861 | ssh2_pkt_addstring_start(); |
862 | ssh2_pkt_addstring_str(data); |
863 | } |
864 | char *ssh2_mpint_fmt(Bignum b, int *len) { |
865 | unsigned char *p; |
866 | int i, n = b[0]; |
867 | p = malloc(n * 2 + 1); |
868 | if (!p) |
869 | fatalbox("out of memory"); |
870 | p[0] = 0; |
871 | for (i = 0; i < n; i++) { |
872 | p[i*2+1] = (b[n-i] >> 8) & 0xFF; |
873 | p[i*2+2] = (b[n-i] ) & 0xFF; |
874 | } |
875 | i = 0; |
876 | while (p[i] == 0 && (p[i+1] & 0x80) == 0) |
877 | i++; |
878 | memmove(p, p+i, n*2+1-i); |
879 | *len = n*2+1-i; |
880 | return p; |
881 | } |
882 | void ssh2_pkt_addmp(Bignum b) { |
883 | unsigned char *p; |
884 | int len; |
885 | p = ssh2_mpint_fmt(b, &len); |
886 | ssh2_pkt_addstring_start(); |
887 | ssh2_pkt_addstring_data(p, len); |
888 | free(p); |
889 | } |
890 | void ssh2_pkt_send(void) { |
891 | int cipherblk, maclen, padding, i; |
892 | static unsigned long outgoing_sequence = 0; |
893 | |
894 | /* |
895 | * Add padding. At least four bytes, and must also bring total |
896 | * length (minus MAC) up to a multiple of the block size. |
897 | */ |
898 | cipherblk = cipher ? cipher->blksize : 8; /* block size */ |
899 | cipherblk = cipherblk < 8 ? 8 : cipherblk; /* or 8 if blksize < 8 */ |
900 | padding = 4; |
901 | padding += (cipherblk - (pktout.length + padding) % cipherblk) % cipherblk; |
902 | pktout.data[4] = padding; |
903 | for (i = 0; i < padding; i++) |
904 | pktout.data[pktout.length + i] = random_byte(); |
905 | PUT_32BIT(pktout.data, pktout.length + padding - 4); |
906 | if (csmac) |
907 | csmac->generate(pktout.data, pktout.length + padding, |
908 | outgoing_sequence); |
909 | outgoing_sequence++; /* whether or not we MACed */ |
910 | |
911 | #if 0 |
912 | debug(("Sending packet len=%d\r\n", pktout.length+padding)); |
913 | for (i = 0; i < pktout.length+padding; i++) |
914 | debug((" %02x", (unsigned char)pktout.data[i])); |
915 | debug(("\r\n")); |
916 | #endif |
917 | |
918 | if (cscipher) |
919 | cscipher->encrypt(pktout.data, pktout.length + padding); |
920 | maclen = csmac ? csmac->len : 0; |
921 | |
922 | s_write(pktout.data, pktout.length + padding + maclen); |
923 | } |
924 | |
925 | #if 0 |
926 | void bndebug(char *string, Bignum b) { |
927 | unsigned char *p; |
928 | int i, len; |
929 | p = ssh2_mpint_fmt(b, &len); |
930 | debug(("%s", string)); |
931 | for (i = 0; i < len; i++) |
932 | debug((" %02x", p[i])); |
933 | debug(("\r\n")); |
934 | free(p); |
935 | } |
936 | #endif |
937 | |
938 | void sha_mpint(SHA_State *s, Bignum b) { |
939 | unsigned char *p; |
940 | int len; |
941 | p = ssh2_mpint_fmt(b, &len); |
942 | sha_string(s, p, len); |
943 | free(p); |
944 | } |
945 | |
946 | /* |
947 | * SSH2 packet decode functions. |
948 | */ |
949 | unsigned long ssh2_pkt_getuint32(void) { |
950 | unsigned long value; |
951 | if (pktin.length - pktin.savedpos < 4) |
952 | return 0; /* arrgh, no way to decline (FIXME?) */ |
953 | value = GET_32BIT(pktin.data+pktin.savedpos); |
954 | pktin.savedpos += 4; |
955 | return value; |
956 | } |
957 | void ssh2_pkt_getstring(char **p, int *length) { |
958 | *p = NULL; |
959 | if (pktin.length - pktin.savedpos < 4) |
960 | return; |
961 | *length = GET_32BIT(pktin.data+pktin.savedpos); |
962 | pktin.savedpos += 4; |
963 | if (pktin.length - pktin.savedpos < *length) |
964 | return; |
965 | *p = pktin.data+pktin.savedpos; |
966 | pktin.savedpos += *length; |
967 | } |
968 | Bignum ssh2_pkt_getmp(void) { |
969 | char *p; |
970 | int i, j, length; |
971 | Bignum b; |
972 | |
973 | ssh2_pkt_getstring(&p, &length); |
974 | if (!p) |
975 | return NULL; |
8d5de777 |
976 | if (p[0] & 0x80) { |
977 | bombout(("internal error: Can't handle negative mpints")); |
978 | return NULL; |
979 | } |
7cca0d81 |
980 | b = newbn((length+1)/2); |
981 | for (i = 0; i < length; i++) { |
982 | j = length - 1 - i; |
983 | if (j & 1) |
984 | b[j/2+1] |= ((unsigned char)p[i]) << 8; |
985 | else |
986 | b[j/2+1] |= ((unsigned char)p[i]); |
987 | } |
988 | return b; |
989 | } |
990 | |
374330e2 |
991 | static int do_ssh_init(void) { |
c5e9c988 |
992 | char c, *vsp; |
374330e2 |
993 | char version[10]; |
c5e9c988 |
994 | char vstring[80]; |
995 | char vlog[sizeof(vstring)+20]; |
374330e2 |
996 | int i; |
997 | |
998 | #ifdef FWHACK |
999 | i = 0; |
1000 | while (s_read(&c, 1) == 1) { |
1001 | if (c == 'S' && i < 2) i++; |
1002 | else if (c == 'S' && i == 2) i = 2; |
1003 | else if (c == 'H' && i == 2) break; |
1004 | else i = 0; |
1005 | } |
1006 | #else |
1007 | if (s_read(&c,1) != 1 || c != 'S') return 0; |
1008 | if (s_read(&c,1) != 1 || c != 'S') return 0; |
1009 | if (s_read(&c,1) != 1 || c != 'H') return 0; |
1010 | #endif |
c5e9c988 |
1011 | strcpy(vstring, "SSH-"); |
1012 | vsp = vstring+4; |
374330e2 |
1013 | if (s_read(&c,1) != 1 || c != '-') return 0; |
1014 | i = 0; |
1015 | while (1) { |
1016 | if (s_read(&c,1) != 1) |
1017 | return 0; |
c5e9c988 |
1018 | if (vsp < vstring+sizeof(vstring)-1) |
1019 | *vsp++ = c; |
374330e2 |
1020 | if (i >= 0) { |
1021 | if (c == '-') { |
1022 | version[i] = '\0'; |
1023 | i = -1; |
1024 | } else if (i < sizeof(version)-1) |
1025 | version[i++] = c; |
1026 | } |
1027 | else if (c == '\n') |
1028 | break; |
1029 | } |
1030 | |
c5e9c988 |
1031 | *vsp = 0; |
1032 | sprintf(vlog, "Server version: %s", vstring); |
1033 | vlog[strcspn(vlog, "\r\n")] = '\0'; |
1034 | logevent(vlog); |
1035 | |
adf799dd |
1036 | /* |
1037 | * Server version "1.99" means we can choose whether we use v1 |
1038 | * or v2 protocol. Choice is based on cfg.sshprot. |
1039 | */ |
1040 | if (ssh_versioncmp(version, cfg.sshprot == 1 ? "2.0" : "1.99") >= 0) { |
e5574168 |
1041 | /* |
1042 | * This is a v2 server. Begin v2 protocol. |
1043 | */ |
1044 | char *verstring = "SSH-2.0-PuTTY"; |
1045 | SHA_Init(&exhash); |
1046 | /* |
1047 | * Hash our version string and their version string. |
1048 | */ |
1049 | sha_string(&exhash, verstring, strlen(verstring)); |
1050 | sha_string(&exhash, vstring, strcspn(vstring, "\r\n")); |
1051 | sprintf(vstring, "%s\n", verstring); |
1052 | sprintf(vlog, "We claim version: %s", verstring); |
1053 | logevent(vlog); |
1054 | logevent("Using SSH protocol version 2"); |
1055 | s_write(vstring, strlen(vstring)); |
1056 | ssh_protocol = ssh2_protocol; |
6abbf9e3 |
1057 | ssh_version = 2; |
e5574168 |
1058 | s_rdpkt = ssh2_rdpkt; |
1059 | } else { |
1060 | /* |
1061 | * This is a v1 server. Begin v1 protocol. |
1062 | */ |
1063 | sprintf(vstring, "SSH-%s-PuTTY\n", |
1064 | (ssh_versioncmp(version, "1.5") <= 0 ? version : "1.5")); |
1065 | sprintf(vlog, "We claim version: %s", vstring); |
1066 | vlog[strcspn(vlog, "\r\n")] = '\0'; |
1067 | logevent(vlog); |
1068 | logevent("Using SSH protocol version 1"); |
1069 | s_write(vstring, strlen(vstring)); |
1070 | ssh_protocol = ssh1_protocol; |
6abbf9e3 |
1071 | ssh_version = 1; |
e5574168 |
1072 | s_rdpkt = ssh1_rdpkt; |
1073 | } |
8ccc75b0 |
1074 | ssh_send_ok = 0; |
fef97f43 |
1075 | return 1; |
374330e2 |
1076 | } |
1077 | |
fb09bf1c |
1078 | /* |
1079 | * Handle the key exchange and user authentication phases. |
1080 | */ |
e5574168 |
1081 | static int do_ssh1_login(unsigned char *in, int inlen, int ispkt) |
fb09bf1c |
1082 | { |
374330e2 |
1083 | int i, j, len; |
374330e2 |
1084 | unsigned char *rsabuf, *keystr1, *keystr2; |
1085 | unsigned char cookie[8]; |
1086 | struct RSAKey servkey, hostkey; |
1087 | struct MD5Context md5c; |
ccbfb941 |
1088 | static unsigned long supported_ciphers_mask, supported_auths_mask; |
7cca0d81 |
1089 | static int tried_publickey; |
1090 | static unsigned char session_id[16]; |
bea1ef5f |
1091 | int cipher_type; |
374330e2 |
1092 | |
374330e2 |
1093 | crBegin; |
1094 | |
fb09bf1c |
1095 | if (!ispkt) crWaitUntil(ispkt); |
374330e2 |
1096 | |
8d5de777 |
1097 | if (pktin.type != SSH1_SMSG_PUBLIC_KEY) { |
1098 | bombout(("Public key packet not received")); |
1099 | crReturn(0); |
1100 | } |
374330e2 |
1101 | |
c5e9c988 |
1102 | logevent("Received public keys"); |
374330e2 |
1103 | |
c5e9c988 |
1104 | memcpy(cookie, pktin.body, 8); |
374330e2 |
1105 | |
7cca0d81 |
1106 | i = makekey(pktin.body+8, &servkey, &keystr1, 0); |
1107 | j = makekey(pktin.body+8+i, &hostkey, &keystr2, 0); |
374330e2 |
1108 | |
c5e9c988 |
1109 | /* |
1c2a93c4 |
1110 | * Log the host key fingerprint. |
c5e9c988 |
1111 | */ |
c5e9c988 |
1112 | { |
1113 | char logmsg[80]; |
1c2a93c4 |
1114 | logevent("Host key fingerprint is:"); |
c5e9c988 |
1115 | strcpy(logmsg, " "); |
1c2a93c4 |
1116 | hostkey.comment = NULL; |
1117 | rsa_fingerprint(logmsg+strlen(logmsg), sizeof(logmsg)-strlen(logmsg), |
1118 | &hostkey); |
c5e9c988 |
1119 | logevent(logmsg); |
1120 | } |
1121 | |
fb09bf1c |
1122 | supported_ciphers_mask = GET_32BIT(pktin.body+12+i+j); |
1123 | supported_auths_mask = GET_32BIT(pktin.body+16+i+j); |
bea1ef5f |
1124 | |
c5e9c988 |
1125 | MD5Init(&md5c); |
374330e2 |
1126 | MD5Update(&md5c, keystr2, hostkey.bytes); |
1127 | MD5Update(&md5c, keystr1, servkey.bytes); |
1128 | MD5Update(&md5c, pktin.body, 8); |
374330e2 |
1129 | MD5Final(session_id, &md5c); |
1130 | |
1131 | for (i=0; i<32; i++) |
1132 | session_key[i] = random_byte(); |
1133 | |
1134 | len = (hostkey.bytes > servkey.bytes ? hostkey.bytes : servkey.bytes); |
1135 | |
1136 | rsabuf = malloc(len); |
1137 | if (!rsabuf) |
1138 | fatalbox("Out of memory"); |
1139 | |
89ee5268 |
1140 | /* |
1141 | * Verify the host key. |
1142 | */ |
1143 | { |
1144 | /* |
1145 | * First format the key into a string. |
1146 | */ |
1147 | int len = rsastr_len(&hostkey); |
d5859615 |
1148 | char fingerprint[100]; |
89ee5268 |
1149 | char *keystr = malloc(len); |
1150 | if (!keystr) |
1151 | fatalbox("Out of memory"); |
1152 | rsastr_fmt(keystr, &hostkey); |
d5859615 |
1153 | rsa_fingerprint(fingerprint, sizeof(fingerprint), &hostkey); |
d4857987 |
1154 | verify_ssh_host_key(savedhost, savedport, "rsa", keystr, fingerprint); |
89ee5268 |
1155 | free(keystr); |
1156 | } |
374330e2 |
1157 | |
1158 | for (i=0; i<32; i++) { |
1159 | rsabuf[i] = session_key[i]; |
1160 | if (i < 16) |
1161 | rsabuf[i] ^= session_id[i]; |
1162 | } |
1163 | |
1164 | if (hostkey.bytes > servkey.bytes) { |
1165 | rsaencrypt(rsabuf, 32, &servkey); |
1166 | rsaencrypt(rsabuf, servkey.bytes, &hostkey); |
1167 | } else { |
1168 | rsaencrypt(rsabuf, 32, &hostkey); |
1169 | rsaencrypt(rsabuf, hostkey.bytes, &servkey); |
1170 | } |
1171 | |
c5e9c988 |
1172 | logevent("Encrypted session key"); |
1173 | |
bea1ef5f |
1174 | cipher_type = cfg.cipher == CIPHER_BLOWFISH ? SSH_CIPHER_BLOWFISH : |
9697bfd2 |
1175 | cfg.cipher == CIPHER_DES ? SSH_CIPHER_DES : |
bea1ef5f |
1176 | SSH_CIPHER_3DES; |
1177 | if ((supported_ciphers_mask & (1 << cipher_type)) == 0) { |
1178 | c_write("Selected cipher not supported, falling back to 3DES\r\n", 53); |
1179 | cipher_type = SSH_CIPHER_3DES; |
1180 | } |
c5e9c988 |
1181 | switch (cipher_type) { |
1182 | case SSH_CIPHER_3DES: logevent("Using 3DES encryption"); break; |
1183 | case SSH_CIPHER_DES: logevent("Using single-DES encryption"); break; |
1184 | case SSH_CIPHER_BLOWFISH: logevent("Using Blowfish encryption"); break; |
1185 | } |
bea1ef5f |
1186 | |
e5574168 |
1187 | send_packet(SSH1_CMSG_SESSION_KEY, |
fb09bf1c |
1188 | PKT_CHAR, cipher_type, |
1189 | PKT_DATA, cookie, 8, |
1190 | PKT_CHAR, (len*8) >> 8, PKT_CHAR, (len*8) & 0xFF, |
1191 | PKT_DATA, rsabuf, len, |
1192 | PKT_INT, 0, |
1193 | PKT_END); |
1194 | |
c5e9c988 |
1195 | logevent("Trying to enable encryption..."); |
374330e2 |
1196 | |
1197 | free(rsabuf); |
1198 | |
5e8358ad |
1199 | cipher = cipher_type == SSH_CIPHER_BLOWFISH ? &ssh_blowfish_ssh1 : |
9697bfd2 |
1200 | cipher_type == SSH_CIPHER_DES ? &ssh_des : |
bea1ef5f |
1201 | &ssh_3des; |
374330e2 |
1202 | cipher->sesskey(session_key); |
1203 | |
fb09bf1c |
1204 | crWaitUntil(ispkt); |
374330e2 |
1205 | |
8d5de777 |
1206 | if (pktin.type != SSH1_SMSG_SUCCESS) { |
1207 | bombout(("Encryption not successfully enabled")); |
1208 | crReturn(0); |
1209 | } |
374330e2 |
1210 | |
c5e9c988 |
1211 | logevent("Successfully started encryption"); |
1212 | |
374330e2 |
1213 | fflush(stdout); |
1214 | { |
1215 | static char username[100]; |
1216 | static int pos = 0; |
1217 | static char c; |
67779be7 |
1218 | if ((flags & FLAG_INTERACTIVE) && !*cfg.username) { |
374330e2 |
1219 | c_write("login as: ", 10); |
67779be7 |
1220 | ssh_send_ok = 1; |
374330e2 |
1221 | while (pos >= 0) { |
fb09bf1c |
1222 | crWaitUntil(!ispkt); |
374330e2 |
1223 | while (inlen--) switch (c = *in++) { |
1224 | case 10: case 13: |
1225 | username[pos] = 0; |
1226 | pos = -1; |
1227 | break; |
1228 | case 8: case 127: |
1229 | if (pos > 0) { |
1230 | c_write("\b \b", 3); |
1231 | pos--; |
1232 | } |
1233 | break; |
1234 | case 21: case 27: |
1235 | while (pos > 0) { |
1236 | c_write("\b \b", 3); |
1237 | pos--; |
1238 | } |
1239 | break; |
1240 | case 3: case 4: |
1241 | random_save_seed(); |
1242 | exit(0); |
1243 | break; |
1244 | default: |
40d24aa6 |
1245 | if (((c >= ' ' && c <= '~') || |
1246 | ((unsigned char)c >= 160)) && pos < 40) { |
374330e2 |
1247 | username[pos++] = c; |
1248 | c_write(&c, 1); |
1249 | } |
1250 | break; |
1251 | } |
1252 | } |
1253 | c_write("\r\n", 2); |
1254 | username[strcspn(username, "\n\r")] = '\0'; |
1255 | } else { |
1256 | char stuff[200]; |
1257 | strncpy(username, cfg.username, 99); |
1258 | username[99] = '\0'; |
67779be7 |
1259 | if ((flags & FLAG_VERBOSE) || (flags & FLAG_INTERACTIVE)) { |
fb09bf1c |
1260 | sprintf(stuff, "Sent username \"%s\".\r\n", username); |
4017be6d |
1261 | c_write(stuff, strlen(stuff)); |
fb09bf1c |
1262 | } |
374330e2 |
1263 | } |
fb09bf1c |
1264 | |
e5574168 |
1265 | send_packet(SSH1_CMSG_USER, PKT_STR, username, PKT_END); |
c5e9c988 |
1266 | { |
1267 | char userlog[20+sizeof(username)]; |
1268 | sprintf(userlog, "Sent username \"%s\"", username); |
1269 | logevent(userlog); |
1270 | } |
374330e2 |
1271 | } |
1272 | |
fb09bf1c |
1273 | crWaitUntil(ispkt); |
374330e2 |
1274 | |
7cca0d81 |
1275 | tried_publickey = 0; |
1276 | |
e5574168 |
1277 | while (pktin.type == SSH1_SMSG_FAILURE) { |
374330e2 |
1278 | static char password[100]; |
a52f067e |
1279 | static char prompt[200]; |
374330e2 |
1280 | static int pos; |
1281 | static char c; |
ccbfb941 |
1282 | static int pwpkt_type; |
ccbfb941 |
1283 | /* |
1284 | * Show password prompt, having first obtained it via a TIS |
18515c51 |
1285 | * or CryptoCard exchange if we're doing TIS or CryptoCard |
1286 | * authentication. |
ccbfb941 |
1287 | */ |
e5574168 |
1288 | pwpkt_type = SSH1_CMSG_AUTH_PASSWORD; |
5c58ad2d |
1289 | if (agent_exists()) { |
1290 | /* |
1291 | * Attempt RSA authentication using Pageant. |
1292 | */ |
1293 | static unsigned char request[5], *response, *p; |
1294 | static int responselen; |
1295 | static int i, nkeys; |
1296 | static int authed = FALSE; |
1297 | void *r; |
1298 | |
1299 | logevent("Pageant is running. Requesting keys."); |
1300 | |
1301 | /* Request the keys held by the agent. */ |
1302 | PUT_32BIT(request, 1); |
1303 | request[4] = SSH_AGENTC_REQUEST_RSA_IDENTITIES; |
1304 | agent_query(request, 5, &r, &responselen); |
1305 | response = (unsigned char *)r; |
1306 | if (response) { |
1307 | p = response + 5; |
1308 | nkeys = GET_32BIT(p); p += 4; |
1309 | { char buf[64]; sprintf(buf, "Pageant has %d keys", nkeys); |
1310 | logevent(buf); } |
1311 | for (i = 0; i < nkeys; i++) { |
1312 | static struct RSAKey key; |
1313 | static Bignum challenge; |
b8bb811a |
1314 | static char *commentp; |
1315 | static int commentlen; |
5c58ad2d |
1316 | |
1317 | { char buf[64]; sprintf(buf, "Trying Pageant key #%d", i); |
1318 | logevent(buf); } |
1319 | p += 4; |
1320 | p += ssh1_read_bignum(p, &key.exponent); |
1321 | p += ssh1_read_bignum(p, &key.modulus); |
b8bb811a |
1322 | commentlen = GET_32BIT(p); p += 4; |
1323 | commentp = p; p += commentlen; |
5c58ad2d |
1324 | send_packet(SSH1_CMSG_AUTH_RSA, |
1325 | PKT_BIGNUM, key.modulus, PKT_END); |
1326 | crWaitUntil(ispkt); |
1327 | if (pktin.type != SSH1_SMSG_AUTH_RSA_CHALLENGE) { |
1328 | logevent("Key refused"); |
1329 | continue; |
1330 | } |
1331 | logevent("Received RSA challenge"); |
1332 | ssh1_read_bignum(pktin.body, &challenge); |
1333 | { |
1334 | char *agentreq, *q, *ret; |
1335 | int len, retlen; |
1336 | len = 1 + 4; /* message type, bit count */ |
1337 | len += ssh1_bignum_length(key.exponent); |
1338 | len += ssh1_bignum_length(key.modulus); |
1339 | len += ssh1_bignum_length(challenge); |
1340 | len += 16; /* session id */ |
1341 | len += 4; /* response format */ |
1342 | agentreq = malloc(4 + len); |
1343 | PUT_32BIT(agentreq, len); |
1344 | q = agentreq + 4; |
1345 | *q++ = SSH_AGENTC_RSA_CHALLENGE; |
1346 | PUT_32BIT(q, ssh1_bignum_bitcount(key.modulus)); |
1347 | q += 4; |
1348 | q += ssh1_write_bignum(q, key.exponent); |
1349 | q += ssh1_write_bignum(q, key.modulus); |
1350 | q += ssh1_write_bignum(q, challenge); |
1351 | memcpy(q, session_id, 16); q += 16; |
1352 | PUT_32BIT(q, 1); /* response format */ |
1353 | agent_query(agentreq, len+4, &ret, &retlen); |
1354 | free(agentreq); |
1355 | if (ret) { |
1356 | if (ret[4] == SSH_AGENT_RSA_RESPONSE) { |
1357 | logevent("Sending Pageant's response"); |
1358 | send_packet(SSH1_CMSG_AUTH_RSA_RESPONSE, |
1359 | PKT_DATA, ret+5, 16, PKT_END); |
1360 | free(ret); |
1361 | crWaitUntil(ispkt); |
1362 | if (pktin.type == SSH1_SMSG_SUCCESS) { |
1363 | logevent("Pageant's response accepted"); |
c4fa2fce |
1364 | if (flags & FLAG_VERBOSE) { |
1365 | c_write("Authenticated using RSA key \"", |
1366 | 29); |
1367 | c_write(commentp, commentlen); |
1368 | c_write("\" from agent\r\n", 14); |
1369 | } |
5c58ad2d |
1370 | authed = TRUE; |
1371 | } else |
1372 | logevent("Pageant's response not accepted"); |
1373 | } else { |
1374 | logevent("Pageant failed to answer challenge"); |
1375 | free(ret); |
1376 | } |
1377 | } else { |
1378 | logevent("No reply received from Pageant"); |
1379 | } |
1380 | } |
1381 | freebn(key.exponent); |
1382 | freebn(key.modulus); |
1383 | freebn(challenge); |
1384 | if (authed) |
1385 | break; |
1386 | } |
1387 | } |
1388 | if (authed) |
1389 | break; |
1390 | } |
7cca0d81 |
1391 | if (*cfg.keyfile && !tried_publickey) |
1392 | pwpkt_type = SSH1_CMSG_AUTH_RSA; |
fb09bf1c |
1393 | |
a52f067e |
1394 | if (pktin.type == SSH1_SMSG_FAILURE && |
1395 | cfg.try_tis_auth && |
1396 | (supported_auths_mask & (1<<SSH1_AUTH_TIS))) { |
1397 | pwpkt_type = SSH1_CMSG_AUTH_TIS_RESPONSE; |
1398 | logevent("Requested TIS authentication"); |
1399 | send_packet(SSH1_CMSG_AUTH_TIS, PKT_END); |
1400 | crWaitUntil(ispkt); |
1401 | if (pktin.type != SSH1_SMSG_AUTH_TIS_CHALLENGE) { |
1402 | logevent("TIS authentication declined"); |
1403 | if (flags & FLAG_INTERACTIVE) |
1404 | c_write("TIS authentication refused.\r\n", 29); |
1405 | } else { |
1406 | int challengelen = ((pktin.body[0] << 24) | |
1407 | (pktin.body[1] << 16) | |
1408 | (pktin.body[2] << 8) | |
1409 | (pktin.body[3])); |
1410 | logevent("Received TIS challenge"); |
1411 | if (challengelen > sizeof(prompt)-1) |
1412 | challengelen = sizeof(prompt)-1; /* prevent overrun */ |
1413 | memcpy(prompt, pktin.body+4, challengelen); |
1414 | prompt[challengelen] = '\0'; |
1415 | } |
1416 | } |
1417 | if (pktin.type == SSH1_SMSG_FAILURE && |
1418 | cfg.try_tis_auth && |
1419 | (supported_auths_mask & (1<<SSH1_AUTH_CCARD))) { |
1420 | pwpkt_type = SSH1_CMSG_AUTH_CCARD_RESPONSE; |
1421 | logevent("Requested CryptoCard authentication"); |
1422 | send_packet(SSH1_CMSG_AUTH_CCARD, PKT_END); |
1423 | crWaitUntil(ispkt); |
1424 | if (pktin.type != SSH1_SMSG_AUTH_CCARD_CHALLENGE) { |
1425 | logevent("CryptoCard authentication declined"); |
1426 | c_write("CryptoCard authentication refused.\r\n", 29); |
1427 | } else { |
1428 | int challengelen = ((pktin.body[0] << 24) | |
1429 | (pktin.body[1] << 16) | |
1430 | (pktin.body[2] << 8) | |
1431 | (pktin.body[3])); |
1432 | logevent("Received CryptoCard challenge"); |
1433 | if (challengelen > sizeof(prompt)-1) |
1434 | challengelen = sizeof(prompt)-1; /* prevent overrun */ |
1435 | memcpy(prompt, pktin.body+4, challengelen); |
1436 | strncpy(prompt + challengelen, "\r\nResponse : ", |
1437 | sizeof(prompt)-challengelen); |
1438 | prompt[sizeof(prompt)-1] = '\0'; |
1439 | } |
1440 | } |
1441 | if (pwpkt_type == SSH1_CMSG_AUTH_PASSWORD) { |
1442 | sprintf(prompt, "%.90s@%.90s's password: ", |
1443 | cfg.username, savedhost); |
1444 | } |
1445 | if (pwpkt_type == SSH1_CMSG_AUTH_RSA) { |
1446 | char *comment = NULL; |
1447 | if (flags & FLAG_VERBOSE) |
1448 | c_write("Trying public key authentication.\r\n", 35); |
1449 | if (!rsakey_encrypted(cfg.keyfile, &comment)) { |
1450 | if (flags & FLAG_VERBOSE) |
1451 | c_write("No passphrase required.\r\n", 25); |
1452 | goto tryauth; |
1453 | } |
1454 | sprintf(prompt, "Passphrase for key \"%.100s\": ", comment); |
1455 | free(comment); |
1456 | } |
1457 | |
d8426c54 |
1458 | if (ssh_get_password) { |
85ee8208 |
1459 | if (!ssh_get_password(prompt, password, sizeof(password))) { |
1460 | /* |
1461 | * get_password failed to get a password (for |
1462 | * example because one was supplied on the command |
1463 | * line which has already failed to work). |
1464 | * Terminate. |
1465 | */ |
1466 | logevent("No more passwords to try"); |
1467 | ssh_state = SSH_STATE_CLOSED; |
1468 | crReturn(1); |
1469 | } |
fb09bf1c |
1470 | } else { |
a52f067e |
1471 | c_write(prompt, strlen(prompt)); |
7cca0d81 |
1472 | pos = 0; |
67779be7 |
1473 | ssh_send_ok = 1; |
7cca0d81 |
1474 | while (pos >= 0) { |
1475 | crWaitUntil(!ispkt); |
1476 | while (inlen--) switch (c = *in++) { |
1477 | case 10: case 13: |
1478 | password[pos] = 0; |
1479 | pos = -1; |
1480 | break; |
1481 | case 8: case 127: |
1482 | if (pos > 0) |
1483 | pos--; |
1484 | break; |
1485 | case 21: case 27: |
1486 | pos = 0; |
1487 | break; |
1488 | case 3: case 4: |
1489 | random_save_seed(); |
1490 | exit(0); |
1491 | break; |
1492 | default: |
1493 | if (((c >= ' ' && c <= '~') || |
1494 | ((unsigned char)c >= 160)) && pos < sizeof(password)) |
1495 | password[pos++] = c; |
1496 | break; |
1497 | } |
1498 | } |
1499 | c_write("\r\n", 2); |
a52f067e |
1500 | } |
fb09bf1c |
1501 | |
7cca0d81 |
1502 | tryauth: |
1503 | if (pwpkt_type == SSH1_CMSG_AUTH_RSA) { |
1504 | /* |
1505 | * Try public key authentication with the specified |
1506 | * key file. |
1507 | */ |
1508 | static struct RSAKey pubkey; |
1509 | static Bignum challenge, response; |
1510 | static int i; |
1511 | static unsigned char buffer[32]; |
1512 | |
1513 | tried_publickey = 1; |
1514 | i = loadrsakey(cfg.keyfile, &pubkey, password); |
1515 | if (i == 0) { |
1516 | c_write("Couldn't load public key from ", 30); |
1517 | c_write(cfg.keyfile, strlen(cfg.keyfile)); |
1518 | c_write(".\r\n", 3); |
1519 | continue; /* go and try password */ |
1520 | } |
1521 | if (i == -1) { |
1522 | c_write("Wrong passphrase.\r\n", 19); |
1523 | tried_publickey = 0; |
1524 | continue; /* try again */ |
1525 | } |
1526 | |
1527 | /* |
1528 | * Send a public key attempt. |
1529 | */ |
1530 | send_packet(SSH1_CMSG_AUTH_RSA, |
1531 | PKT_BIGNUM, pubkey.modulus, PKT_END); |
1532 | |
1533 | crWaitUntil(ispkt); |
1534 | if (pktin.type == SSH1_SMSG_FAILURE) { |
a52f067e |
1535 | c_write("Server refused our public key.\r\n", 32); |
7cca0d81 |
1536 | continue; /* go and try password */ |
1537 | } |
8d5de777 |
1538 | if (pktin.type != SSH1_SMSG_AUTH_RSA_CHALLENGE) { |
1539 | bombout(("Bizarre response to offer of public key")); |
1540 | crReturn(0); |
1541 | } |
7cca0d81 |
1542 | ssh1_read_bignum(pktin.body, &challenge); |
1543 | response = rsadecrypt(challenge, &pubkey); |
1544 | freebn(pubkey.private_exponent); /* burn the evidence */ |
1545 | |
1546 | for (i = 0; i < 32; i += 2) { |
1547 | buffer[i] = response[16-i/2] >> 8; |
1548 | buffer[i+1] = response[16-i/2] & 0xFF; |
1549 | } |
1550 | |
1551 | MD5Init(&md5c); |
1552 | MD5Update(&md5c, buffer, 32); |
1553 | MD5Update(&md5c, session_id, 16); |
1554 | MD5Final(buffer, &md5c); |
1555 | |
1556 | send_packet(SSH1_CMSG_AUTH_RSA_RESPONSE, |
1557 | PKT_DATA, buffer, 16, PKT_END); |
1558 | |
1559 | crWaitUntil(ispkt); |
1560 | if (pktin.type == SSH1_SMSG_FAILURE) { |
4017be6d |
1561 | if (flags & FLAG_VERBOSE) |
1562 | c_write("Failed to authenticate with our public key.\r\n", |
1563 | 45); |
7cca0d81 |
1564 | continue; /* go and try password */ |
1565 | } else if (pktin.type != SSH1_SMSG_SUCCESS) { |
8d5de777 |
1566 | bombout(("Bizarre response to RSA authentication response")); |
1567 | crReturn(0); |
7cca0d81 |
1568 | } |
1569 | |
1570 | break; /* we're through! */ |
1571 | } else { |
1572 | send_packet(pwpkt_type, PKT_STR, password, PKT_END); |
1573 | } |
c5e9c988 |
1574 | logevent("Sent password"); |
374330e2 |
1575 | memset(password, 0, strlen(password)); |
fb09bf1c |
1576 | crWaitUntil(ispkt); |
e5574168 |
1577 | if (pktin.type == SSH1_SMSG_FAILURE) { |
4017be6d |
1578 | if (flags & FLAG_VERBOSE) |
1579 | c_write("Access denied\r\n", 15); |
c5e9c988 |
1580 | logevent("Authentication refused"); |
e5574168 |
1581 | } else if (pktin.type == SSH1_MSG_DISCONNECT) { |
fb09bf1c |
1582 | logevent("Received disconnect request"); |
85ee8208 |
1583 | ssh_state = SSH_STATE_CLOSED; |
1584 | crReturn(1); |
e5574168 |
1585 | } else if (pktin.type != SSH1_SMSG_SUCCESS) { |
8d5de777 |
1586 | bombout(("Strange packet received, type %d", pktin.type)); |
1587 | crReturn(0); |
374330e2 |
1588 | } |
1589 | } |
1590 | |
c5e9c988 |
1591 | logevent("Authentication successful"); |
1592 | |
fb09bf1c |
1593 | crFinish(1); |
1594 | } |
1595 | |
e5574168 |
1596 | static void ssh1_protocol(unsigned char *in, int inlen, int ispkt) { |
fb09bf1c |
1597 | crBegin; |
1598 | |
1599 | random_init(); |
1600 | |
e5574168 |
1601 | while (!do_ssh1_login(in, inlen, ispkt)) { |
fb09bf1c |
1602 | crReturnV; |
85ee8208 |
1603 | } |
1604 | if (ssh_state == SSH_STATE_CLOSED) |
1605 | crReturnV; |
fb09bf1c |
1606 | |
979310f1 |
1607 | if (cfg.agentfwd && agent_exists()) { |
dacbd0e8 |
1608 | logevent("Requesting agent forwarding"); |
1609 | send_packet(SSH1_CMSG_AGENT_REQUEST_FORWARDING, PKT_END); |
1610 | do { crReturnV; } while (!ispkt); |
1611 | if (pktin.type != SSH1_SMSG_SUCCESS && pktin.type != SSH1_SMSG_FAILURE) { |
8d5de777 |
1612 | bombout(("Protocol confusion")); |
1613 | crReturnV; |
dacbd0e8 |
1614 | } else if (pktin.type == SSH1_SMSG_FAILURE) { |
1615 | logevent("Agent forwarding refused"); |
1616 | } else |
1617 | logevent("Agent forwarding enabled"); |
1618 | } |
1619 | |
fef97f43 |
1620 | if (!cfg.nopty) { |
e5574168 |
1621 | send_packet(SSH1_CMSG_REQUEST_PTY, |
fb09bf1c |
1622 | PKT_STR, cfg.termtype, |
1623 | PKT_INT, rows, PKT_INT, cols, |
1624 | PKT_INT, 0, PKT_INT, 0, |
1625 | PKT_CHAR, 0, |
1626 | PKT_END); |
fef97f43 |
1627 | ssh_state = SSH_STATE_INTERMED; |
1628 | do { crReturnV; } while (!ispkt); |
e5574168 |
1629 | if (pktin.type != SSH1_SMSG_SUCCESS && pktin.type != SSH1_SMSG_FAILURE) { |
8d5de777 |
1630 | bombout(("Protocol confusion")); |
1631 | crReturnV; |
e5574168 |
1632 | } else if (pktin.type == SSH1_SMSG_FAILURE) { |
fef97f43 |
1633 | c_write("Server refused to allocate pty\r\n", 32); |
1634 | } |
c5e9c988 |
1635 | logevent("Allocated pty"); |
374330e2 |
1636 | } |
1637 | |
6abbf9e3 |
1638 | if (*cfg.remote_cmd) |
1639 | send_packet(SSH1_CMSG_EXEC_CMD, PKT_STR, cfg.remote_cmd, PKT_END); |
1640 | else |
1641 | send_packet(SSH1_CMSG_EXEC_SHELL, PKT_END); |
c5e9c988 |
1642 | logevent("Started session"); |
374330e2 |
1643 | |
1644 | ssh_state = SSH_STATE_SESSION; |
1645 | if (size_needed) |
1646 | ssh_size(); |
1647 | |
8ccc75b0 |
1648 | ssh_send_ok = 1; |
dacbd0e8 |
1649 | ssh_channels = newtree234(ssh_channelcmp); |
6f34e365 |
1650 | begin_session(); |
374330e2 |
1651 | while (1) { |
1652 | crReturnV; |
1653 | if (ispkt) { |
e5574168 |
1654 | if (pktin.type == SSH1_SMSG_STDOUT_DATA || |
1655 | pktin.type == SSH1_SMSG_STDERR_DATA) { |
fb09bf1c |
1656 | long len = GET_32BIT(pktin.body); |
3bdaf79d |
1657 | c_writedata(pktin.body+4, len); |
e5574168 |
1658 | } else if (pktin.type == SSH1_MSG_DISCONNECT) { |
21248260 |
1659 | ssh_state = SSH_STATE_CLOSED; |
c5e9c988 |
1660 | logevent("Received disconnect request"); |
dacbd0e8 |
1661 | } else if (pktin.type == SSH1_SMSG_AGENT_OPEN) { |
1662 | /* Remote side is trying to open a channel to talk to our |
1663 | * agent. Give them back a local channel number. */ |
d211621f |
1664 | unsigned i = 1; |
dacbd0e8 |
1665 | struct ssh_channel *c; |
1666 | enum234 e; |
1667 | for (c = first234(ssh_channels, &e); c; c = next234(&e)) { |
1668 | if (c->localid > i) |
1669 | break; /* found a free number */ |
1670 | i = c->localid + 1; |
1671 | } |
1672 | c = malloc(sizeof(struct ssh_channel)); |
1673 | c->remoteid = GET_32BIT(pktin.body); |
1674 | c->localid = i; |
b8bb811a |
1675 | c->closes = 0; |
dacbd0e8 |
1676 | c->type = SSH1_SMSG_AGENT_OPEN; /* identify channel type */ |
bb487ce2 |
1677 | c->u.a.lensofar = 0; |
dacbd0e8 |
1678 | add234(ssh_channels, c); |
1679 | send_packet(SSH1_MSG_CHANNEL_OPEN_CONFIRMATION, |
1680 | PKT_INT, c->remoteid, PKT_INT, c->localid, |
1681 | PKT_END); |
1682 | } else if (pktin.type == SSH1_MSG_CHANNEL_CLOSE || |
1683 | pktin.type == SSH1_MSG_CHANNEL_CLOSE_CONFIRMATION) { |
1684 | /* Remote side closes a channel. */ |
d211621f |
1685 | unsigned i = GET_32BIT(pktin.body); |
dacbd0e8 |
1686 | struct ssh_channel *c; |
1687 | c = find234(ssh_channels, &i, ssh_channelfind); |
1688 | if (c) { |
1689 | int closetype; |
1690 | closetype = (pktin.type == SSH1_MSG_CHANNEL_CLOSE ? 1 : 2); |
1691 | send_packet(pktin.type, PKT_INT, c->remoteid, PKT_END); |
1692 | c->closes |= closetype; |
1693 | if (c->closes == 3) { |
1694 | del234(ssh_channels, c); |
1695 | free(c); |
1696 | } |
1697 | } |
1698 | } else if (pktin.type == SSH1_MSG_CHANNEL_DATA) { |
1699 | /* Data sent down one of our channels. */ |
1700 | int i = GET_32BIT(pktin.body); |
1701 | int len = GET_32BIT(pktin.body+4); |
1702 | unsigned char *p = pktin.body+8; |
1703 | struct ssh_channel *c; |
1704 | c = find234(ssh_channels, &i, ssh_channelfind); |
1705 | if (c) { |
1706 | switch(c->type) { |
1707 | case SSH1_SMSG_AGENT_OPEN: |
1708 | /* Data for an agent message. Buffer it. */ |
1709 | while (len > 0) { |
1710 | if (c->u.a.lensofar < 4) { |
1711 | int l = min(4 - c->u.a.lensofar, len); |
1712 | memcpy(c->u.a.msglen + c->u.a.lensofar, p, l); |
1713 | p += l; len -= l; c->u.a.lensofar += l; |
1714 | } |
1715 | if (c->u.a.lensofar == 4) { |
1716 | c->u.a.totallen = 4 + GET_32BIT(c->u.a.msglen); |
1717 | c->u.a.message = malloc(c->u.a.totallen); |
1718 | memcpy(c->u.a.message, c->u.a.msglen, 4); |
1719 | } |
1720 | if (c->u.a.lensofar >= 4 && len > 0) { |
1721 | int l = min(c->u.a.totallen - c->u.a.lensofar, len); |
1722 | memcpy(c->u.a.message + c->u.a.lensofar, p, l); |
1723 | p += l; len -= l; c->u.a.lensofar += l; |
1724 | } |
1725 | if (c->u.a.lensofar == c->u.a.totallen) { |
1726 | void *reply, *sentreply; |
1727 | int replylen; |
1728 | agent_query(c->u.a.message, c->u.a.totallen, |
1729 | &reply, &replylen); |
1730 | if (reply) |
1731 | sentreply = reply; |
1732 | else { |
1733 | /* Fake SSH_AGENT_FAILURE. */ |
1734 | sentreply = "\0\0\0\1\5"; |
1735 | replylen = 5; |
1736 | } |
1737 | send_packet(SSH1_MSG_CHANNEL_DATA, |
1738 | PKT_INT, c->remoteid, |
1739 | PKT_INT, replylen, |
1740 | PKT_DATA, sentreply, replylen, |
1741 | PKT_END); |
1742 | if (reply) |
1743 | free(reply); |
1744 | free(c->u.a.message); |
1745 | c->u.a.lensofar = 0; |
1746 | } |
1747 | } |
1748 | break; |
1749 | } |
1750 | } |
e5574168 |
1751 | } else if (pktin.type == SSH1_SMSG_SUCCESS) { |
972a41c8 |
1752 | /* may be from EXEC_SHELL on some servers */ |
e5574168 |
1753 | } else if (pktin.type == SSH1_SMSG_FAILURE) { |
972a41c8 |
1754 | /* may be from EXEC_SHELL on some servers |
374330e2 |
1755 | * if no pty is available or in other odd cases. Ignore */ |
e5574168 |
1756 | } else if (pktin.type == SSH1_SMSG_EXIT_STATUS) { |
1757 | send_packet(SSH1_CMSG_EXIT_CONFIRMATION, PKT_END); |
374330e2 |
1758 | } else { |
8d5de777 |
1759 | bombout(("Strange packet received: type %d", pktin.type)); |
1760 | crReturnV; |
374330e2 |
1761 | } |
1762 | } else { |
e5574168 |
1763 | send_packet(SSH1_CMSG_STDIN_DATA, |
fb09bf1c |
1764 | PKT_INT, inlen, PKT_DATA, in, inlen, PKT_END); |
374330e2 |
1765 | } |
1766 | } |
1767 | |
1768 | crFinishV; |
1769 | } |
1770 | |
1771 | /* |
e5574168 |
1772 | * Utility routine for decoding comma-separated strings in KEXINIT. |
1773 | */ |
1774 | int in_commasep_string(char *needle, char *haystack, int haylen) { |
1775 | int needlen = strlen(needle); |
1776 | while (1) { |
1777 | /* |
1778 | * Is it at the start of the string? |
1779 | */ |
1780 | if (haylen >= needlen && /* haystack is long enough */ |
1781 | !memcmp(needle, haystack, needlen) && /* initial match */ |
1782 | (haylen == needlen || haystack[needlen] == ',') |
1783 | /* either , or EOS follows */ |
1784 | ) |
1785 | return 1; |
1786 | /* |
1787 | * If not, search for the next comma and resume after that. |
1788 | * If no comma found, terminate. |
1789 | */ |
1790 | while (haylen > 0 && *haystack != ',') |
1791 | haylen--, haystack++; |
1792 | if (haylen == 0) |
1793 | return 0; |
1794 | haylen--, haystack++; /* skip over comma itself */ |
1795 | } |
1796 | } |
1797 | |
1798 | /* |
d39f364a |
1799 | * SSH2 key creation method. |
1800 | */ |
1801 | void ssh2_mkkey(Bignum K, char *H, char chr, char *keyspace) { |
1802 | SHA_State s; |
1803 | /* First 20 bytes. */ |
1804 | SHA_Init(&s); |
1805 | sha_mpint(&s, K); |
1806 | SHA_Bytes(&s, H, 20); |
1807 | SHA_Bytes(&s, &chr, 1); |
1808 | SHA_Bytes(&s, H, 20); |
1809 | SHA_Final(&s, keyspace); |
1810 | /* Next 20 bytes. */ |
1811 | SHA_Init(&s); |
1812 | sha_mpint(&s, K); |
1813 | SHA_Bytes(&s, H, 20); |
1814 | SHA_Bytes(&s, keyspace, 20); |
1815 | SHA_Final(&s, keyspace+20); |
1816 | } |
1817 | |
1818 | /* |
7cca0d81 |
1819 | * Handle the SSH2 transport layer. |
e5574168 |
1820 | */ |
7cca0d81 |
1821 | static int do_ssh2_transport(unsigned char *in, int inlen, int ispkt) |
e5574168 |
1822 | { |
1823 | static int i, len; |
1824 | static char *str; |
1825 | static Bignum e, f, K; |
57476f6b |
1826 | static const struct ssh_cipher *cscipher_tobe = NULL; |
1827 | static const struct ssh_cipher *sccipher_tobe = NULL; |
1828 | static const struct ssh_mac *csmac_tobe = NULL; |
1829 | static const struct ssh_mac *scmac_tobe = NULL; |
1830 | static const struct ssh_compress *cscomp_tobe = NULL; |
1831 | static const struct ssh_compress *sccomp_tobe = NULL; |
d5859615 |
1832 | static char *hostkeydata, *sigdata, *keystr, *fingerprint; |
e5574168 |
1833 | static int hostkeylen, siglen; |
1834 | static unsigned char exchange_hash[20]; |
d39f364a |
1835 | static unsigned char keyspace[40]; |
57476f6b |
1836 | static const struct ssh_cipher *preferred_cipher; |
e5574168 |
1837 | |
1838 | crBegin; |
7cca0d81 |
1839 | random_init(); |
e5574168 |
1840 | |
5e8358ad |
1841 | /* |
1842 | * Set up the preferred cipher. |
1843 | */ |
1844 | if (cfg.cipher == CIPHER_BLOWFISH) { |
57476f6b |
1845 | preferred_cipher = &ssh_blowfish_ssh2; |
5e8358ad |
1846 | } else if (cfg.cipher == CIPHER_DES) { |
1847 | logevent("Single DES not supported in SSH2; using 3DES"); |
57476f6b |
1848 | preferred_cipher = &ssh_3des_ssh2; |
5e8358ad |
1849 | } else if (cfg.cipher == CIPHER_3DES) { |
57476f6b |
1850 | preferred_cipher = &ssh_3des_ssh2; |
5e8358ad |
1851 | } else { |
1852 | /* Shouldn't happen, but we do want to initialise to _something_. */ |
57476f6b |
1853 | preferred_cipher = &ssh_3des_ssh2; |
5e8358ad |
1854 | } |
1855 | |
7cca0d81 |
1856 | begin_key_exchange: |
e5574168 |
1857 | /* |
1858 | * Construct and send our key exchange packet. |
1859 | */ |
1860 | ssh2_pkt_init(SSH2_MSG_KEXINIT); |
1861 | for (i = 0; i < 16; i++) |
1862 | ssh2_pkt_addbyte((unsigned char)random_byte()); |
1863 | /* List key exchange algorithms. */ |
1864 | ssh2_pkt_addstring_start(); |
1865 | for (i = 0; i < lenof(kex_algs); i++) { |
1866 | ssh2_pkt_addstring_str(kex_algs[i]->name); |
1867 | if (i < lenof(kex_algs)-1) |
1868 | ssh2_pkt_addstring_str(","); |
1869 | } |
1870 | /* List server host key algorithms. */ |
1871 | ssh2_pkt_addstring_start(); |
1872 | for (i = 0; i < lenof(hostkey_algs); i++) { |
1873 | ssh2_pkt_addstring_str(hostkey_algs[i]->name); |
1874 | if (i < lenof(hostkey_algs)-1) |
1875 | ssh2_pkt_addstring_str(","); |
1876 | } |
1877 | /* List client->server encryption algorithms. */ |
1878 | ssh2_pkt_addstring_start(); |
57476f6b |
1879 | for (i = -1; i < lenof(ciphers); i++) { |
1880 | const struct ssh_cipher *c = i<0 ? preferred_cipher : ciphers[i]; |
1881 | ssh2_pkt_addstring_str(c->name); |
e5574168 |
1882 | if (i < lenof(ciphers)-1) |
1883 | ssh2_pkt_addstring_str(","); |
1884 | } |
1885 | /* List server->client encryption algorithms. */ |
1886 | ssh2_pkt_addstring_start(); |
57476f6b |
1887 | for (i = -1; i < lenof(ciphers); i++) { |
1888 | const struct ssh_cipher *c = i<0 ? preferred_cipher : ciphers[i]; |
1889 | ssh2_pkt_addstring_str(c->name); |
e5574168 |
1890 | if (i < lenof(ciphers)-1) |
1891 | ssh2_pkt_addstring_str(","); |
1892 | } |
1893 | /* List client->server MAC algorithms. */ |
1894 | ssh2_pkt_addstring_start(); |
1895 | for (i = 0; i < lenof(macs); i++) { |
1896 | ssh2_pkt_addstring_str(macs[i]->name); |
1897 | if (i < lenof(macs)-1) |
1898 | ssh2_pkt_addstring_str(","); |
1899 | } |
1900 | /* List server->client MAC algorithms. */ |
1901 | ssh2_pkt_addstring_start(); |
1902 | for (i = 0; i < lenof(macs); i++) { |
1903 | ssh2_pkt_addstring_str(macs[i]->name); |
1904 | if (i < lenof(macs)-1) |
1905 | ssh2_pkt_addstring_str(","); |
1906 | } |
1907 | /* List client->server compression algorithms. */ |
1908 | ssh2_pkt_addstring_start(); |
1909 | for (i = 0; i < lenof(compressions); i++) { |
1910 | ssh2_pkt_addstring_str(compressions[i]->name); |
1911 | if (i < lenof(compressions)-1) |
1912 | ssh2_pkt_addstring_str(","); |
1913 | } |
1914 | /* List server->client compression algorithms. */ |
1915 | ssh2_pkt_addstring_start(); |
1916 | for (i = 0; i < lenof(compressions); i++) { |
1917 | ssh2_pkt_addstring_str(compressions[i]->name); |
1918 | if (i < lenof(compressions)-1) |
1919 | ssh2_pkt_addstring_str(","); |
1920 | } |
1921 | /* List client->server languages. Empty list. */ |
1922 | ssh2_pkt_addstring_start(); |
1923 | /* List server->client languages. Empty list. */ |
1924 | ssh2_pkt_addstring_start(); |
1925 | /* First KEX packet does _not_ follow, because we're not that brave. */ |
1926 | ssh2_pkt_addbool(FALSE); |
1927 | /* Reserved. */ |
1928 | ssh2_pkt_adduint32(0); |
1929 | sha_string(&exhash, pktout.data+5, pktout.length-5); |
1930 | ssh2_pkt_send(); |
1931 | |
1932 | if (!ispkt) crWaitUntil(ispkt); |
1933 | sha_string(&exhash, pktin.data+5, pktin.length-5); |
1934 | |
1935 | /* |
1936 | * Now examine the other side's KEXINIT to see what we're up |
1937 | * to. |
1938 | */ |
7cca0d81 |
1939 | if (pktin.type != SSH2_MSG_KEXINIT) { |
8d5de777 |
1940 | bombout(("expected key exchange packet from server")); |
1941 | crReturn(0); |
7cca0d81 |
1942 | } |
e5574168 |
1943 | kex = NULL; hostkey = NULL; cscipher_tobe = NULL; sccipher_tobe = NULL; |
1944 | csmac_tobe = NULL; scmac_tobe = NULL; cscomp_tobe = NULL; sccomp_tobe = NULL; |
1945 | pktin.savedpos += 16; /* skip garbage cookie */ |
1946 | ssh2_pkt_getstring(&str, &len); /* key exchange algorithms */ |
1947 | for (i = 0; i < lenof(kex_algs); i++) { |
1948 | if (in_commasep_string(kex_algs[i]->name, str, len)) { |
1949 | kex = kex_algs[i]; |
1950 | break; |
1951 | } |
1952 | } |
1953 | ssh2_pkt_getstring(&str, &len); /* host key algorithms */ |
1954 | for (i = 0; i < lenof(hostkey_algs); i++) { |
1955 | if (in_commasep_string(hostkey_algs[i]->name, str, len)) { |
1956 | hostkey = hostkey_algs[i]; |
1957 | break; |
1958 | } |
1959 | } |
1960 | ssh2_pkt_getstring(&str, &len); /* client->server cipher */ |
57476f6b |
1961 | for (i = -1; i < lenof(ciphers); i++) { |
1962 | const struct ssh_cipher *c = i<0 ? preferred_cipher : ciphers[i]; |
1963 | if (in_commasep_string(c->name, str, len)) { |
e5574168 |
1964 | cscipher_tobe = ciphers[i]; |
1965 | break; |
1966 | } |
1967 | } |
1968 | ssh2_pkt_getstring(&str, &len); /* server->client cipher */ |
57476f6b |
1969 | for (i = -1; i < lenof(ciphers); i++) { |
1970 | const struct ssh_cipher *c = i<0 ? preferred_cipher : ciphers[i]; |
1971 | if (in_commasep_string(c->name, str, len)) { |
e5574168 |
1972 | sccipher_tobe = ciphers[i]; |
1973 | break; |
1974 | } |
1975 | } |
1976 | ssh2_pkt_getstring(&str, &len); /* client->server mac */ |
1977 | for (i = 0; i < lenof(macs); i++) { |
1978 | if (in_commasep_string(macs[i]->name, str, len)) { |
1979 | csmac_tobe = macs[i]; |
1980 | break; |
1981 | } |
1982 | } |
1983 | ssh2_pkt_getstring(&str, &len); /* server->client mac */ |
1984 | for (i = 0; i < lenof(macs); i++) { |
1985 | if (in_commasep_string(macs[i]->name, str, len)) { |
1986 | scmac_tobe = macs[i]; |
1987 | break; |
1988 | } |
1989 | } |
1990 | ssh2_pkt_getstring(&str, &len); /* client->server compression */ |
1991 | for (i = 0; i < lenof(compressions); i++) { |
1992 | if (in_commasep_string(compressions[i]->name, str, len)) { |
1993 | cscomp_tobe = compressions[i]; |
1994 | break; |
1995 | } |
1996 | } |
1997 | ssh2_pkt_getstring(&str, &len); /* server->client compression */ |
1998 | for (i = 0; i < lenof(compressions); i++) { |
1999 | if (in_commasep_string(compressions[i]->name, str, len)) { |
2000 | sccomp_tobe = compressions[i]; |
2001 | break; |
2002 | } |
2003 | } |
e5574168 |
2004 | |
2005 | /* |
2006 | * Currently we only support Diffie-Hellman and DSS, so let's |
2007 | * bomb out if those aren't selected. |
2008 | */ |
8d5de777 |
2009 | if (kex != &ssh_diffiehellman || hostkey != &ssh_dss) { |
2010 | bombout(("internal fault: chaos in SSH 2 transport layer")); |
2011 | crReturn(0); |
2012 | } |
e5574168 |
2013 | |
2014 | /* |
2015 | * Now we begin the fun. Generate and send e for Diffie-Hellman. |
2016 | */ |
2017 | e = dh_create_e(); |
e5574168 |
2018 | ssh2_pkt_init(SSH2_MSG_KEXDH_INIT); |
2019 | ssh2_pkt_addmp(e); |
2020 | ssh2_pkt_send(); |
2021 | |
2022 | crWaitUntil(ispkt); |
7cca0d81 |
2023 | if (pktin.type != SSH2_MSG_KEXDH_REPLY) { |
8d5de777 |
2024 | bombout(("expected key exchange packet from server")); |
2025 | crReturn(0); |
7cca0d81 |
2026 | } |
e5574168 |
2027 | ssh2_pkt_getstring(&hostkeydata, &hostkeylen); |
2028 | f = ssh2_pkt_getmp(); |
e5574168 |
2029 | ssh2_pkt_getstring(&sigdata, &siglen); |
2030 | |
2031 | K = dh_find_K(f); |
e5574168 |
2032 | |
2033 | sha_string(&exhash, hostkeydata, hostkeylen); |
2034 | sha_mpint(&exhash, e); |
2035 | sha_mpint(&exhash, f); |
2036 | sha_mpint(&exhash, K); |
2037 | SHA_Final(&exhash, exchange_hash); |
2038 | |
7cca0d81 |
2039 | #if 0 |
e5574168 |
2040 | debug(("Exchange hash is:\r\n")); |
2041 | for (i = 0; i < 20; i++) |
2042 | debug((" %02x", exchange_hash[i])); |
2043 | debug(("\r\n")); |
7cca0d81 |
2044 | #endif |
2045 | |
2046 | hostkey->setkey(hostkeydata, hostkeylen); |
8d5de777 |
2047 | if (!hostkey->verifysig(sigdata, siglen, exchange_hash, 20)) { |
2048 | bombout(("Server failed host key check")); |
2049 | crReturn(0); |
2050 | } |
e5574168 |
2051 | |
2052 | /* |
7cca0d81 |
2053 | * Expect SSH2_MSG_NEWKEYS from server. |
d39f364a |
2054 | */ |
7cca0d81 |
2055 | crWaitUntil(ispkt); |
8d5de777 |
2056 | if (pktin.type != SSH2_MSG_NEWKEYS) { |
2057 | bombout(("expected new-keys packet from server")); |
2058 | crReturn(0); |
2059 | } |
d39f364a |
2060 | |
2061 | /* |
7cca0d81 |
2062 | * Authenticate remote host: verify host key. (We've already |
2063 | * checked the signature of the exchange hash.) |
e5574168 |
2064 | */ |
7cca0d81 |
2065 | keystr = hostkey->fmtkey(); |
d5859615 |
2066 | fingerprint = hostkey->fingerprint(); |
d4857987 |
2067 | verify_ssh_host_key(savedhost, savedport, hostkey->keytype, |
2068 | keystr, fingerprint); |
d5859615 |
2069 | logevent("Host key fingerprint is:"); |
2070 | logevent(fingerprint); |
2071 | free(fingerprint); |
7cca0d81 |
2072 | free(keystr); |
d39f364a |
2073 | |
2074 | /* |
7cca0d81 |
2075 | * Send SSH2_MSG_NEWKEYS. |
d39f364a |
2076 | */ |
2077 | ssh2_pkt_init(SSH2_MSG_NEWKEYS); |
2078 | ssh2_pkt_send(); |
d39f364a |
2079 | |
2080 | /* |
2081 | * Create and initialise session keys. |
2082 | */ |
2083 | cscipher = cscipher_tobe; |
2084 | sccipher = sccipher_tobe; |
2085 | csmac = csmac_tobe; |
2086 | scmac = scmac_tobe; |
2087 | cscomp = cscomp_tobe; |
2088 | sccomp = sccomp_tobe; |
2089 | /* |
2090 | * Set IVs after keys. |
2091 | */ |
2092 | ssh2_mkkey(K, exchange_hash, 'C', keyspace); cscipher->setcskey(keyspace); |
2093 | ssh2_mkkey(K, exchange_hash, 'D', keyspace); cscipher->setsckey(keyspace); |
2094 | ssh2_mkkey(K, exchange_hash, 'A', keyspace); cscipher->setcsiv(keyspace); |
2095 | ssh2_mkkey(K, exchange_hash, 'B', keyspace); sccipher->setsciv(keyspace); |
2096 | ssh2_mkkey(K, exchange_hash, 'E', keyspace); csmac->setcskey(keyspace); |
2097 | ssh2_mkkey(K, exchange_hash, 'F', keyspace); scmac->setsckey(keyspace); |
2098 | |
033b4cef |
2099 | /* |
7cca0d81 |
2100 | * Now we're encrypting. Begin returning 1 to the protocol main |
2101 | * function so that other things can run on top of the |
2102 | * transport. If we ever see a KEXINIT, we must go back to the |
2103 | * start. |
033b4cef |
2104 | */ |
7cca0d81 |
2105 | do { |
2106 | crReturn(1); |
2107 | } while (!(ispkt && pktin.type == SSH2_MSG_KEXINIT)); |
2108 | goto begin_key_exchange; |
e5574168 |
2109 | |
2110 | crFinish(1); |
2111 | } |
2112 | |
7cca0d81 |
2113 | /* |
2114 | * Handle the SSH2 userauth and connection layers. |
2115 | */ |
2116 | static void do_ssh2_authconn(unsigned char *in, int inlen, int ispkt) |
2117 | { |
7cca0d81 |
2118 | static unsigned long remote_winsize; |
2119 | static unsigned long remote_maxpkt; |
2120 | |
e5574168 |
2121 | crBegin; |
2122 | |
7cca0d81 |
2123 | /* |
2124 | * Request userauth protocol, and await a response to it. |
2125 | */ |
2126 | ssh2_pkt_init(SSH2_MSG_SERVICE_REQUEST); |
2127 | ssh2_pkt_addstring("ssh-userauth"); |
2128 | ssh2_pkt_send(); |
2129 | crWaitUntilV(ispkt); |
8d5de777 |
2130 | if (pktin.type != SSH2_MSG_SERVICE_ACCEPT) { |
2131 | bombout(("Server refused user authentication protocol")); |
2132 | crReturnV; |
2133 | } |
7cca0d81 |
2134 | |
2135 | /* |
2136 | * FIXME: currently we support only password authentication. |
2137 | * (This places us technically in violation of the SSH2 spec. |
2138 | * We must fix this.) |
2139 | */ |
2140 | while (1) { |
2141 | /* |
2142 | * Get a username and a password. |
2143 | */ |
2144 | static char username[100]; |
2145 | static char password[100]; |
2146 | static int pos = 0; |
2147 | static char c; |
e5574168 |
2148 | |
67779be7 |
2149 | if ((flags & FLAG_INTERACTIVE) && !*cfg.username) { |
7cca0d81 |
2150 | c_write("login as: ", 10); |
67779be7 |
2151 | ssh_send_ok = 1; |
7cca0d81 |
2152 | while (pos >= 0) { |
2153 | crWaitUntilV(!ispkt); |
2154 | while (inlen--) switch (c = *in++) { |
2155 | case 10: case 13: |
2156 | username[pos] = 0; |
2157 | pos = -1; |
2158 | break; |
2159 | case 8: case 127: |
2160 | if (pos > 0) { |
2161 | c_write("\b \b", 3); |
2162 | pos--; |
2163 | } |
2164 | break; |
2165 | case 21: case 27: |
2166 | while (pos > 0) { |
2167 | c_write("\b \b", 3); |
2168 | pos--; |
2169 | } |
2170 | break; |
2171 | case 3: case 4: |
2172 | random_save_seed(); |
2173 | exit(0); |
2174 | break; |
2175 | default: |
2176 | if (((c >= ' ' && c <= '~') || |
2177 | ((unsigned char)c >= 160)) && pos < 40) { |
2178 | username[pos++] = c; |
2179 | c_write(&c, 1); |
2180 | } |
2181 | break; |
2182 | } |
2183 | } |
2184 | c_write("\r\n", 2); |
2185 | username[strcspn(username, "\n\r")] = '\0'; |
2186 | } else { |
2187 | char stuff[200]; |
2188 | strncpy(username, cfg.username, 99); |
2189 | username[99] = '\0'; |
67779be7 |
2190 | if ((flags & FLAG_VERBOSE) || (flags & FLAG_INTERACTIVE)) { |
7cca0d81 |
2191 | sprintf(stuff, "Using username \"%s\".\r\n", username); |
2192 | c_write(stuff, strlen(stuff)); |
2193 | } |
2194 | } |
2195 | |
d8426c54 |
2196 | if (ssh_get_password) { |
7cca0d81 |
2197 | char prompt[200]; |
3bdaf79d |
2198 | sprintf(prompt, "%.90s@%.90s's password: ", cfg.username, savedhost); |
7cca0d81 |
2199 | if (!ssh_get_password(prompt, password, sizeof(password))) { |
2200 | /* |
2201 | * get_password failed to get a password (for |
2202 | * example because one was supplied on the command |
2203 | * line which has already failed to work). |
2204 | * Terminate. |
2205 | */ |
2206 | logevent("No more passwords to try"); |
2207 | ssh_state = SSH_STATE_CLOSED; |
2208 | crReturnV; |
2209 | } |
2210 | } else { |
2211 | c_write("password: ", 10); |
67779be7 |
2212 | ssh_send_ok = 1; |
7cca0d81 |
2213 | |
2214 | pos = 0; |
2215 | while (pos >= 0) { |
2216 | crWaitUntilV(!ispkt); |
2217 | while (inlen--) switch (c = *in++) { |
2218 | case 10: case 13: |
2219 | password[pos] = 0; |
2220 | pos = -1; |
2221 | break; |
2222 | case 8: case 127: |
2223 | if (pos > 0) |
2224 | pos--; |
2225 | break; |
2226 | case 21: case 27: |
2227 | pos = 0; |
2228 | break; |
2229 | case 3: case 4: |
2230 | random_save_seed(); |
2231 | exit(0); |
2232 | break; |
2233 | default: |
2234 | if (((c >= ' ' && c <= '~') || |
2235 | ((unsigned char)c >= 160)) && pos < 40) |
2236 | password[pos++] = c; |
2237 | break; |
2238 | } |
2239 | } |
2240 | c_write("\r\n", 2); |
2241 | } |
2242 | |
2243 | ssh2_pkt_init(SSH2_MSG_USERAUTH_REQUEST); |
2244 | ssh2_pkt_addstring(username); |
2245 | ssh2_pkt_addstring("ssh-connection"); /* service requested */ |
2246 | ssh2_pkt_addstring("password"); |
2247 | ssh2_pkt_addbool(FALSE); |
2248 | ssh2_pkt_addstring(password); |
2249 | ssh2_pkt_send(); |
2250 | |
2251 | crWaitUntilV(ispkt); |
2252 | if (pktin.type != SSH2_MSG_USERAUTH_SUCCESS) { |
2253 | c_write("Access denied\r\n", 15); |
2254 | logevent("Authentication refused"); |
2255 | } else |
2256 | break; |
2257 | } |
2258 | |
2259 | /* |
2260 | * Now we're authenticated for the connection protocol. The |
2261 | * connection protocol will automatically have started at this |
2262 | * point; there's no need to send SERVICE_REQUEST. |
2263 | */ |
2264 | |
2265 | /* |
2266 | * So now create a channel with a session in it. |
2267 | */ |
d211621f |
2268 | mainchan = malloc(sizeof(struct ssh_channel)); |
2269 | mainchan->localid = 100; /* as good as any */ |
7cca0d81 |
2270 | ssh2_pkt_init(SSH2_MSG_CHANNEL_OPEN); |
2271 | ssh2_pkt_addstring("session"); |
d211621f |
2272 | ssh2_pkt_adduint32(mainchan->localid); |
2273 | ssh2_pkt_adduint32(0x7FFFFFFFUL); /* our window size */ |
2274 | ssh2_pkt_adduint32(0x4000UL); /* our max pkt size */ |
7cca0d81 |
2275 | ssh2_pkt_send(); |
2276 | crWaitUntilV(ispkt); |
2277 | if (pktin.type != SSH2_MSG_CHANNEL_OPEN_CONFIRMATION) { |
8d5de777 |
2278 | bombout(("Server refused to open a session")); |
2279 | crReturnV; |
7cca0d81 |
2280 | /* FIXME: error data comes back in FAILURE packet */ |
2281 | } |
d211621f |
2282 | if (ssh2_pkt_getuint32() != mainchan->localid) { |
8d5de777 |
2283 | bombout(("Server's channel confirmation cited wrong channel")); |
2284 | crReturnV; |
7cca0d81 |
2285 | } |
d211621f |
2286 | mainchan->remoteid = ssh2_pkt_getuint32(); |
2287 | mainchan->u.v2.remwindow = ssh2_pkt_getuint32(); |
2288 | mainchan->u.v2.remmaxpkt = ssh2_pkt_getuint32(); |
2289 | mainchan->u.v2.outbuffer = NULL; |
2290 | mainchan->u.v2.outbuflen = mainchan->u.v2.outbufsize = 0; |
7cca0d81 |
2291 | logevent("Opened channel for session"); |
2292 | |
2293 | /* |
2294 | * Now allocate a pty for the session. |
2295 | */ |
67779be7 |
2296 | if (!cfg.nopty) { |
2297 | ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST); |
2298 | ssh2_pkt_adduint32(mainchan->remoteid); /* recipient channel */ |
2299 | ssh2_pkt_addstring("pty-req"); |
2300 | ssh2_pkt_addbool(1); /* want reply */ |
2301 | ssh2_pkt_addstring(cfg.termtype); |
2302 | ssh2_pkt_adduint32(cols); |
2303 | ssh2_pkt_adduint32(rows); |
2304 | ssh2_pkt_adduint32(0); /* pixel width */ |
2305 | ssh2_pkt_adduint32(0); /* pixel height */ |
2306 | ssh2_pkt_addstring_start(); |
2307 | ssh2_pkt_addstring_data("\0", 1);/* TTY_OP_END, no special options */ |
2308 | ssh2_pkt_send(); |
7cca0d81 |
2309 | |
67779be7 |
2310 | do { |
2311 | crWaitUntilV(ispkt); |
2312 | if (pktin.type == SSH2_MSG_CHANNEL_WINDOW_ADJUST) { |
2313 | /* FIXME: be able to handle other channels here */ |
2314 | if (ssh2_pkt_getuint32() != mainchan->localid) |
2315 | continue; /* wrong channel */ |
2316 | mainchan->u.v2.remwindow += ssh2_pkt_getuint32(); |
2317 | } |
2318 | } while (pktin.type == SSH2_MSG_CHANNEL_WINDOW_ADJUST); |
7cca0d81 |
2319 | |
67779be7 |
2320 | if (pktin.type != SSH2_MSG_CHANNEL_SUCCESS) { |
2321 | if (pktin.type != SSH2_MSG_CHANNEL_FAILURE) { |
8d5de777 |
2322 | bombout(("Server got confused by pty request")); |
2323 | crReturnV; |
67779be7 |
2324 | } |
2325 | c_write("Server refused to allocate pty\r\n", 32); |
2326 | } else { |
2327 | logevent("Allocated pty"); |
7cca0d81 |
2328 | } |
7cca0d81 |
2329 | } |
2330 | |
2331 | /* |
67779be7 |
2332 | * Start a shell or a remote command. |
7cca0d81 |
2333 | */ |
2334 | ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST); |
d211621f |
2335 | ssh2_pkt_adduint32(mainchan->remoteid); /* recipient channel */ |
67779be7 |
2336 | if (*cfg.remote_cmd) { |
2337 | ssh2_pkt_addstring("exec"); |
2338 | ssh2_pkt_addbool(1); /* want reply */ |
2339 | ssh2_pkt_addstring(cfg.remote_cmd); |
2340 | } else { |
2341 | ssh2_pkt_addstring("shell"); |
2342 | ssh2_pkt_addbool(1); /* want reply */ |
2343 | } |
7cca0d81 |
2344 | ssh2_pkt_send(); |
d211621f |
2345 | do { |
7cca0d81 |
2346 | crWaitUntilV(ispkt); |
d211621f |
2347 | if (pktin.type == SSH2_MSG_CHANNEL_WINDOW_ADJUST) { |
2348 | /* FIXME: be able to handle other channels here */ |
2349 | if (ssh2_pkt_getuint32() != mainchan->localid) |
2350 | continue; /* wrong channel */ |
2351 | mainchan->u.v2.remwindow += ssh2_pkt_getuint32(); |
2352 | } |
7cca0d81 |
2353 | } while (pktin.type == SSH2_MSG_CHANNEL_WINDOW_ADJUST); |
2354 | if (pktin.type != SSH2_MSG_CHANNEL_SUCCESS) { |
2355 | if (pktin.type != SSH2_MSG_CHANNEL_FAILURE) { |
8d5de777 |
2356 | bombout(("Server got confused by shell/command request")); |
2357 | crReturnV; |
7cca0d81 |
2358 | } |
8d5de777 |
2359 | bombout(("Server refused to start a shell/command")); |
2360 | crReturnV; |
7cca0d81 |
2361 | } else { |
8d5de777 |
2362 | logevent("Started a shell/command"); |
7cca0d81 |
2363 | } |
2364 | |
2365 | /* |
2366 | * Transfer data! |
2367 | */ |
8ccc75b0 |
2368 | ssh_send_ok = 1; |
6f34e365 |
2369 | begin_session(); |
7cca0d81 |
2370 | while (1) { |
d211621f |
2371 | static int try_send; |
e5574168 |
2372 | crReturnV; |
d211621f |
2373 | try_send = FALSE; |
7cca0d81 |
2374 | if (ispkt) { |
2375 | if (pktin.type == SSH2_MSG_CHANNEL_DATA || |
2376 | pktin.type == SSH2_MSG_CHANNEL_EXTENDED_DATA) { |
2377 | char *data; |
2378 | int length; |
d211621f |
2379 | /* FIXME: be able to handle other channels here */ |
2380 | if (ssh2_pkt_getuint32() != mainchan->localid) |
7cca0d81 |
2381 | continue; /* wrong channel */ |
2382 | if (pktin.type == SSH2_MSG_CHANNEL_EXTENDED_DATA && |
2383 | ssh2_pkt_getuint32() != SSH2_EXTENDED_DATA_STDERR) |
2384 | continue; /* extended but not stderr */ |
2385 | ssh2_pkt_getstring(&data, &length); |
d211621f |
2386 | if (data) { |
3bdaf79d |
2387 | c_writedata(data, length); |
d211621f |
2388 | /* |
2389 | * Enlarge the window again at the remote side, |
2390 | * just in case it ever runs down and they fail |
2391 | * to send us any more data. |
2392 | */ |
2393 | ssh2_pkt_init(SSH2_MSG_CHANNEL_WINDOW_ADJUST); |
2394 | ssh2_pkt_adduint32(mainchan->remoteid); |
2395 | ssh2_pkt_adduint32(length); |
2396 | ssh2_pkt_send(); |
2397 | } |
7cca0d81 |
2398 | } else if (pktin.type == SSH2_MSG_DISCONNECT) { |
2399 | ssh_state = SSH_STATE_CLOSED; |
d211621f |
2400 | logevent("Received disconnect message"); |
7cca0d81 |
2401 | } else if (pktin.type == SSH2_MSG_CHANNEL_REQUEST) { |
2402 | continue; /* exit status et al; ignore (FIXME?) */ |
d211621f |
2403 | } else if (pktin.type == SSH2_MSG_CHANNEL_EOF) { |
2404 | continue; /* remote sends EOF; ignore */ |
2405 | } else if (pktin.type == SSH2_MSG_CHANNEL_CLOSE) { |
2406 | /* FIXME: be able to handle other channels here */ |
2407 | if (ssh2_pkt_getuint32() != mainchan->localid) |
2408 | continue; /* wrong channel */ |
2409 | ssh2_pkt_init(SSH2_MSG_CHANNEL_CLOSE); |
2410 | ssh2_pkt_adduint32(mainchan->remoteid); |
2411 | ssh2_pkt_send(); |
2412 | /* FIXME: mark the channel as closed */ |
2413 | if (1 /* FIXME: "all channels are closed" */) { |
2414 | logevent("All channels closed. Disconnecting"); |
2415 | ssh2_pkt_init(SSH2_MSG_DISCONNECT); |
2416 | ssh2_pkt_send(); |
2417 | } |
2418 | continue; /* remote sends close; ignore (FIXME) */ |
7cca0d81 |
2419 | } else if (pktin.type == SSH2_MSG_CHANNEL_WINDOW_ADJUST) { |
d211621f |
2420 | /* FIXME: be able to handle other channels here */ |
2421 | if (ssh2_pkt_getuint32() != mainchan->localid) |
2422 | continue; /* wrong channel */ |
2423 | mainchan->u.v2.remwindow += ssh2_pkt_getuint32(); |
2424 | try_send = TRUE; |
7cca0d81 |
2425 | } else { |
8d5de777 |
2426 | bombout(("Strange packet received: type %d", pktin.type)); |
2427 | crReturnV; |
7cca0d81 |
2428 | } |
2429 | } else { |
d211621f |
2430 | /* |
2431 | * We have spare data. Add it to the channel buffer. |
2432 | */ |
2433 | if (mainchan->u.v2.outbufsize < |
2434 | mainchan->u.v2.outbuflen + inlen) { |
2435 | mainchan->u.v2.outbufsize = |
2436 | mainchan->u.v2.outbuflen + inlen + 1024; |
2437 | mainchan->u.v2.outbuffer = srealloc(mainchan->u.v2.outbuffer, |
2438 | mainchan->u.v2.outbufsize); |
2439 | } |
2440 | memcpy(mainchan->u.v2.outbuffer + mainchan->u.v2.outbuflen, |
2441 | in, inlen); |
2442 | mainchan->u.v2.outbuflen += inlen; |
2443 | try_send = TRUE; |
7cca0d81 |
2444 | } |
d211621f |
2445 | if (try_send) { |
2446 | /* |
2447 | * Try to send data on the channel if we can. (FIXME: |
2448 | * on _all_ channels.) |
2449 | */ |
2450 | while (mainchan->u.v2.remwindow > 0 && |
2451 | mainchan->u.v2.outbuflen > 0) { |
2452 | unsigned len = mainchan->u.v2.remwindow; |
2453 | if (len > mainchan->u.v2.outbuflen) |
2454 | len = mainchan->u.v2.outbuflen; |
2455 | if (len > mainchan->u.v2.remmaxpkt) |
2456 | len = mainchan->u.v2.remmaxpkt; |
2457 | ssh2_pkt_init(SSH2_MSG_CHANNEL_DATA); |
2458 | ssh2_pkt_adduint32(mainchan->remoteid); |
2459 | ssh2_pkt_addstring_start(); |
2460 | ssh2_pkt_addstring_data(mainchan->u.v2.outbuffer, len); |
2461 | ssh2_pkt_send(); |
2462 | mainchan->u.v2.outbuflen -= len; |
2463 | memmove(mainchan->u.v2.outbuffer, mainchan->u.v2.outbuffer+len, |
2464 | mainchan->u.v2.outbuflen); |
2465 | mainchan->u.v2.remwindow -= len; |
2466 | } |
2467 | } |
e5574168 |
2468 | } |
2469 | |
2470 | crFinishV; |
2471 | } |
2472 | |
2473 | /* |
7cca0d81 |
2474 | * Handle the top-level SSH2 protocol. |
2475 | */ |
2476 | static void ssh2_protocol(unsigned char *in, int inlen, int ispkt) |
2477 | { |
2478 | if (do_ssh2_transport(in, inlen, ispkt) == 0) |
2479 | return; |
2480 | do_ssh2_authconn(in, inlen, ispkt); |
2481 | } |
2482 | |
2483 | /* |
374330e2 |
2484 | * Called to set up the connection. Will arrange for WM_NETEVENT |
2485 | * messages to be passed to the specified window, whose window |
2486 | * procedure should then call telnet_msg(). |
2487 | * |
2488 | * Returns an error message, or NULL on success. |
374330e2 |
2489 | */ |
2490 | static char *ssh_init (HWND hwnd, char *host, int port, char **realhost) { |
fb09bf1c |
2491 | char *p; |
8f203108 |
2492 | |
2493 | #ifdef MSCRYPTOAPI |
2494 | if(crypto_startup() == 0) |
2495 | return "Microsoft high encryption pack not installed!"; |
2496 | #endif |
374330e2 |
2497 | |
fb09bf1c |
2498 | p = connect_to_host(host, port, realhost); |
2499 | if (p != NULL) |
2500 | return p; |
374330e2 |
2501 | |
2502 | if (!do_ssh_init()) |
2503 | return "Protocol initialisation error"; |
2504 | |
4017be6d |
2505 | if (hwnd && WSAAsyncSelect (s, hwnd, WM_NETEVENT, FD_READ | FD_CLOSE) == SOCKET_ERROR) |
374330e2 |
2506 | switch (WSAGetLastError()) { |
2507 | case WSAENETDOWN: return "Network is down"; |
2508 | default: return "WSAAsyncSelect(): unknown error"; |
2509 | } |
2510 | |
2511 | return NULL; |
2512 | } |
2513 | |
2514 | /* |
2515 | * Process a WM_NETEVENT message. Will return 0 if the connection |
2516 | * has closed, or <0 for a socket error. |
2517 | */ |
2518 | static int ssh_msg (WPARAM wParam, LPARAM lParam) { |
2519 | int ret; |
2520 | char buf[256]; |
2521 | |
8ce72d2c |
2522 | /* |
2523 | * Because reading less than the whole of the available pending |
2524 | * data can generate an FD_READ event, we need to allow for the |
2525 | * possibility that FD_READ may arrive with FD_CLOSE already in |
2526 | * the queue; so it's possible that we can get here even with s |
2527 | * invalid. If so, we return 1 and don't worry about it. |
2528 | */ |
2529 | if (s == INVALID_SOCKET) |
2530 | return 1; |
374330e2 |
2531 | |
8d5de777 |
2532 | if (WSAGETSELECTERROR(lParam) != 0) { |
2533 | closesocket(s); |
2534 | s = INVALID_SOCKET; |
374330e2 |
2535 | return -WSAGETSELECTERROR(lParam); |
8d5de777 |
2536 | } |
374330e2 |
2537 | |
2538 | switch (WSAGETSELECTEVENT(lParam)) { |
2539 | case FD_READ: |
8ce72d2c |
2540 | case FD_CLOSE: |
374330e2 |
2541 | ret = recv(s, buf, sizeof(buf), 0); |
2542 | if (ret < 0 && WSAGetLastError() == WSAEWOULDBLOCK) |
2543 | return 1; |
8d5de777 |
2544 | if (ret < 0) { /* any _other_ error */ |
2545 | closesocket(s); |
2546 | s = INVALID_SOCKET; |
374330e2 |
2547 | return -10000-WSAGetLastError(); |
8d5de777 |
2548 | } |
374330e2 |
2549 | if (ret == 0) { |
2550 | s = INVALID_SOCKET; |
8ce72d2c |
2551 | return 0; |
374330e2 |
2552 | } |
2553 | ssh_gotdata (buf, ret); |
85ee8208 |
2554 | if (ssh_state == SSH_STATE_CLOSED) { |
2555 | closesocket(s); |
2556 | s = INVALID_SOCKET; |
2557 | return 0; |
2558 | } |
374330e2 |
2559 | return 1; |
374330e2 |
2560 | } |
2561 | return 1; /* shouldn't happen, but WTF */ |
2562 | } |
2563 | |
2564 | /* |
2565 | * Called to send data down the Telnet connection. |
2566 | */ |
2567 | static void ssh_send (char *buf, int len) { |
2568 | if (s == INVALID_SOCKET) |
2569 | return; |
2570 | |
2571 | ssh_protocol(buf, len, 0); |
2572 | } |
2573 | |
2574 | /* |
2575 | * Called to set the size of the window from Telnet's POV. |
2576 | */ |
2577 | static void ssh_size(void) { |
2578 | switch (ssh_state) { |
2579 | case SSH_STATE_BEFORE_SIZE: |
21248260 |
2580 | case SSH_STATE_CLOSED: |
374330e2 |
2581 | break; /* do nothing */ |
2582 | case SSH_STATE_INTERMED: |
2583 | size_needed = TRUE; /* buffer for later */ |
2584 | break; |
2585 | case SSH_STATE_SESSION: |
fef97f43 |
2586 | if (!cfg.nopty) { |
e5574168 |
2587 | send_packet(SSH1_CMSG_WINDOW_SIZE, |
fb09bf1c |
2588 | PKT_INT, rows, PKT_INT, cols, |
2589 | PKT_INT, 0, PKT_INT, 0, PKT_END); |
fef97f43 |
2590 | } |
374330e2 |
2591 | } |
2592 | } |
2593 | |
2594 | /* |
6abbf9e3 |
2595 | * Send Telnet special codes. TS_EOF is useful for `plink', so you |
2596 | * can send an EOF and collect resulting output (e.g. `plink |
2597 | * hostname sort'). |
374330e2 |
2598 | */ |
2599 | static void ssh_special (Telnet_Special code) { |
6abbf9e3 |
2600 | if (code == TS_EOF) { |
67779be7 |
2601 | if (ssh_version == 1) { |
6abbf9e3 |
2602 | send_packet(SSH1_CMSG_EOF, PKT_END); |
2603 | } else { |
2604 | ssh2_pkt_init(SSH2_MSG_CHANNEL_EOF); |
d211621f |
2605 | ssh2_pkt_adduint32(mainchan->remoteid); |
6abbf9e3 |
2606 | ssh2_pkt_send(); |
2607 | } |
67779be7 |
2608 | logevent("Sent EOF message"); |
6abbf9e3 |
2609 | } else { |
2610 | /* do nothing */ |
2611 | } |
374330e2 |
2612 | } |
2613 | |
8ccc75b0 |
2614 | static SOCKET ssh_socket(void) { return s; } |
2615 | |
2616 | static int ssh_sendok(void) { return ssh_send_ok; } |
fb09bf1c |
2617 | |
374330e2 |
2618 | Backend ssh_backend = { |
2619 | ssh_init, |
2620 | ssh_msg, |
2621 | ssh_send, |
2622 | ssh_size, |
4017be6d |
2623 | ssh_special, |
8ccc75b0 |
2624 | ssh_socket, |
2625 | ssh_sendok |
374330e2 |
2626 | }; |