374330e2 |
1 | #include <stdio.h> |
2 | #include <stdlib.h> |
3 | #include <winsock.h> |
4 | |
5 | #include "putty.h" |
6 | |
7 | #ifndef FALSE |
8 | #define FALSE 0 |
9 | #endif |
10 | #ifndef TRUE |
11 | #define TRUE 1 |
12 | #endif |
13 | |
14 | #include "ssh.h" |
15 | |
972a41c8 |
16 | #define SSH_MSG_DISCONNECT 1 |
17 | #define SSH_SMSG_PUBLIC_KEY 2 |
18 | #define SSH_CMSG_SESSION_KEY 3 |
19 | #define SSH_CMSG_USER 4 |
20 | #define SSH_CMSG_AUTH_PASSWORD 9 |
21 | #define SSH_CMSG_REQUEST_PTY 10 |
22 | #define SSH_CMSG_EXEC_SHELL 12 |
23 | #define SSH_CMSG_STDIN_DATA 16 |
24 | #define SSH_SMSG_STDOUT_DATA 17 |
25 | #define SSH_SMSG_STDERR_DATA 18 |
26 | #define SSH_SMSG_SUCCESS 14 |
27 | #define SSH_SMSG_FAILURE 15 |
28 | #define SSH_SMSG_EXITSTATUS 20 |
29 | #define SSH_MSG_IGNORE 32 |
30 | #define SSH_CMSG_EXIT_CONFIRMATION 33 |
31 | #define SSH_MSG_DEBUG 36 |
ccbfb941 |
32 | #define SSH_CMSG_AUTH_TIS 39 |
33 | #define SSH_SMSG_AUTH_TIS_CHALLENGE 40 |
34 | #define SSH_CMSG_AUTH_TIS_RESPONSE 41 |
35 | |
36 | #define SSH_AUTH_TIS 5 |
972a41c8 |
37 | |
374330e2 |
38 | /* Coroutine mechanics for the sillier bits of the code */ |
39 | #define crBegin1 static int crLine = 0; |
40 | #define crBegin2 switch(crLine) { case 0:; |
41 | #define crBegin crBegin1; crBegin2; |
42 | #define crFinish(z) } crLine = 0; return (z) |
43 | #define crFinishV } crLine = 0; return |
44 | #define crReturn(z) \ |
45 | do {\ |
46 | crLine=__LINE__; return (z); case __LINE__:;\ |
47 | } while (0) |
48 | #define crReturnV \ |
49 | do {\ |
50 | crLine=__LINE__; return; case __LINE__:;\ |
51 | } while (0) |
52 | #define crStop(z) do{ crLine = 0; return (z); }while(0) |
53 | #define crStopV do{ crLine = 0; return; }while(0) |
54 | |
55 | #ifndef FALSE |
56 | #define FALSE 0 |
57 | #endif |
58 | #ifndef TRUE |
59 | #define TRUE 1 |
60 | #endif |
61 | |
62 | static SOCKET s = INVALID_SOCKET; |
63 | |
64 | static unsigned char session_key[32]; |
65 | static struct ssh_cipher *cipher = NULL; |
66 | |
67 | static char *savedhost; |
68 | |
69 | static enum { |
70 | SSH_STATE_BEFORE_SIZE, |
71 | SSH_STATE_INTERMED, |
21248260 |
72 | SSH_STATE_SESSION, |
73 | SSH_STATE_CLOSED |
374330e2 |
74 | } ssh_state = SSH_STATE_BEFORE_SIZE; |
75 | |
76 | static int size_needed = FALSE; |
77 | |
78 | static void s_write (char *buf, int len) { |
79 | while (len > 0) { |
80 | int i = send (s, buf, len, 0); |
81 | if (i > 0) |
82 | len -= i, buf += i; |
83 | } |
84 | } |
85 | |
86 | static int s_read (char *buf, int len) { |
87 | int ret = 0; |
88 | while (len > 0) { |
89 | int i = recv (s, buf, len, 0); |
90 | if (i > 0) |
91 | len -= i, buf += i, ret += i; |
92 | else |
93 | return i; |
94 | } |
95 | return ret; |
96 | } |
97 | |
98 | static void c_write (char *buf, int len) { |
99 | while (len--) { |
100 | int new_head = (inbuf_head + 1) & INBUF_MASK; |
374330e2 |
101 | if (new_head != inbuf_reap) { |
102 | inbuf[inbuf_head] = *buf++; |
103 | inbuf_head = new_head; |
cabfd08c |
104 | } else { |
105 | term_out(); |
106 | if( inbuf_head == inbuf_reap ) len++; else break; |
374330e2 |
107 | } |
108 | } |
109 | } |
110 | |
111 | struct Packet { |
112 | long length; |
113 | int type; |
114 | unsigned long crc; |
115 | unsigned char *data; |
116 | unsigned char *body; |
117 | long maxlen; |
118 | }; |
119 | |
120 | static struct Packet pktin = { 0, 0, 0, NULL, 0 }; |
121 | static struct Packet pktout = { 0, 0, 0, NULL, 0 }; |
122 | |
123 | static void ssh_protocol(unsigned char *in, int inlen, int ispkt); |
124 | static void ssh_size(void); |
125 | |
126 | static void ssh_gotdata(unsigned char *data, int datalen) { |
127 | static long len, biglen, to_read; |
f67b4e85 |
128 | static unsigned char *p; |
374330e2 |
129 | static int i, pad; |
572f871e |
130 | static unsigned long realcrc, gotcrc; |
374330e2 |
131 | |
132 | crBegin; |
133 | while (1) { |
134 | for (i = len = 0; i < 4; i++) { |
135 | while (datalen == 0) |
136 | crReturnV; |
137 | len = (len << 8) + *data; |
138 | data++, datalen--; |
139 | } |
140 | |
37508af4 |
141 | #ifdef FWHACK |
142 | if (len == 0x52656d6f) { /* "Remo"te server has closed ... */ |
143 | len = 0x300; /* big enough to carry to end */ |
144 | } |
145 | #endif |
146 | |
374330e2 |
147 | pad = 8 - (len%8); |
148 | |
149 | biglen = len + pad; |
150 | |
151 | len -= 5; /* type and CRC */ |
152 | |
153 | pktin.length = len; |
154 | if (pktin.maxlen < biglen) { |
155 | pktin.maxlen = biglen; |
8f203108 |
156 | #ifdef MSCRYPTOAPI |
157 | /* Allocate enough buffer space for extra block |
158 | * for MS CryptEncrypt() */ |
159 | pktin.data = (pktin.data == NULL ? malloc(biglen+8) : |
160 | realloc(pktin.data, biglen+8)); |
161 | #else |
374330e2 |
162 | pktin.data = (pktin.data == NULL ? malloc(biglen) : |
8f203108 |
163 | realloc(pktin.data, biglen)); |
164 | #endif |
374330e2 |
165 | if (!pktin.data) |
166 | fatalbox("Out of memory"); |
167 | } |
168 | |
169 | p = pktin.data, to_read = biglen; |
170 | while (to_read > 0) { |
171 | static int chunk; |
172 | chunk = to_read; |
173 | while (datalen == 0) |
174 | crReturnV; |
175 | if (chunk > datalen) |
176 | chunk = datalen; |
177 | memcpy(p, data, chunk); |
178 | data += chunk; |
179 | datalen -= chunk; |
180 | p += chunk; |
181 | to_read -= chunk; |
182 | } |
183 | |
184 | if (cipher) |
185 | cipher->decrypt(pktin.data, biglen); |
186 | |
187 | pktin.type = pktin.data[pad]; |
188 | pktin.body = pktin.data+pad+1; |
189 | |
572f871e |
190 | realcrc = crc32(pktin.data, biglen-4); |
191 | gotcrc = (pktin.data[biglen-4] << 24); |
192 | gotcrc |= (pktin.data[biglen-3] << 16); |
193 | gotcrc |= (pktin.data[biglen-2] << 8); |
194 | gotcrc |= (pktin.data[biglen-1] << 0); |
195 | if (gotcrc != realcrc) { |
196 | fatalbox("Incorrect CRC received on packet"); |
197 | } |
198 | |
972a41c8 |
199 | if (pktin.type == SSH_MSG_DEBUG) { |
374330e2 |
200 | /* FIXME: log it */ |
972a41c8 |
201 | } else if (pktin.type == SSH_MSG_IGNORE) { |
96b9dc0a |
202 | /* do nothing */; |
374330e2 |
203 | } else |
204 | ssh_protocol(NULL, 0, 1); |
205 | } |
206 | crFinishV; |
207 | } |
208 | |
209 | static void s_wrpkt_start(int type, int len) { |
210 | int pad, biglen; |
211 | |
212 | len += 5; /* type and CRC */ |
213 | pad = 8 - (len%8); |
214 | biglen = len + pad; |
215 | |
216 | pktout.length = len-5; |
217 | if (pktout.maxlen < biglen) { |
218 | pktout.maxlen = biglen; |
8f203108 |
219 | #ifdef MSCRYPTOAPI |
220 | /* Allocate enough buffer space for extra block |
221 | * for MS CryptEncrypt() */ |
222 | pktout.data = (pktout.data == NULL ? malloc(biglen+8) : |
223 | realloc(pktout.data, biglen+8)); |
224 | #else |
c1f5f956 |
225 | pktout.data = (pktout.data == NULL ? malloc(biglen+4) : |
226 | realloc(pktout.data, biglen+4)); |
8f203108 |
227 | #endif |
374330e2 |
228 | if (!pktout.data) |
229 | fatalbox("Out of memory"); |
230 | } |
231 | |
232 | pktout.type = type; |
233 | pktout.body = pktout.data+4+pad+1; |
234 | } |
235 | |
236 | static void s_wrpkt(void) { |
237 | int pad, len, biglen, i; |
238 | unsigned long crc; |
239 | |
240 | len = pktout.length + 5; /* type and CRC */ |
241 | pad = 8 - (len%8); |
242 | biglen = len + pad; |
243 | |
244 | pktout.body[-1] = pktout.type; |
245 | for (i=0; i<pad; i++) |
246 | pktout.data[i+4] = random_byte(); |
247 | crc = crc32(pktout.data+4, biglen-4); |
248 | |
249 | pktout.data[biglen+0] = (unsigned char) ((crc >> 24) & 0xFF); |
250 | pktout.data[biglen+1] = (unsigned char) ((crc >> 16) & 0xFF); |
251 | pktout.data[biglen+2] = (unsigned char) ((crc >> 8) & 0xFF); |
252 | pktout.data[biglen+3] = (unsigned char) (crc & 0xFF); |
253 | |
254 | pktout.data[0] = (len >> 24) & 0xFF; |
255 | pktout.data[1] = (len >> 16) & 0xFF; |
256 | pktout.data[2] = (len >> 8) & 0xFF; |
257 | pktout.data[3] = len & 0xFF; |
258 | |
259 | if (cipher) |
260 | cipher->encrypt(pktout.data+4, biglen); |
261 | |
262 | s_write(pktout.data, biglen+4); |
263 | } |
264 | |
9697bfd2 |
265 | static int ssh_versioncmp(char *a, char *b) { |
266 | char *ae, *be; |
267 | unsigned long av, bv; |
268 | |
43aa02a7 |
269 | av = strtoul(a, &ae, 10); |
270 | bv = strtoul(b, &be, 10); |
9697bfd2 |
271 | if (av != bv) return (av < bv ? -1 : +1); |
272 | if (*ae == '.') ae++; |
273 | if (*be == '.') be++; |
43aa02a7 |
274 | av = strtoul(ae, &ae, 10); |
275 | bv = strtoul(be, &be, 10); |
9697bfd2 |
276 | if (av != bv) return (av < bv ? -1 : +1); |
277 | return 0; |
278 | } |
279 | |
374330e2 |
280 | static int do_ssh_init(void) { |
c5e9c988 |
281 | char c, *vsp; |
374330e2 |
282 | char version[10]; |
c5e9c988 |
283 | char vstring[80]; |
284 | char vlog[sizeof(vstring)+20]; |
374330e2 |
285 | int i; |
286 | |
287 | #ifdef FWHACK |
288 | i = 0; |
289 | while (s_read(&c, 1) == 1) { |
290 | if (c == 'S' && i < 2) i++; |
291 | else if (c == 'S' && i == 2) i = 2; |
292 | else if (c == 'H' && i == 2) break; |
293 | else i = 0; |
294 | } |
295 | #else |
296 | if (s_read(&c,1) != 1 || c != 'S') return 0; |
297 | if (s_read(&c,1) != 1 || c != 'S') return 0; |
298 | if (s_read(&c,1) != 1 || c != 'H') return 0; |
299 | #endif |
c5e9c988 |
300 | strcpy(vstring, "SSH-"); |
301 | vsp = vstring+4; |
374330e2 |
302 | if (s_read(&c,1) != 1 || c != '-') return 0; |
303 | i = 0; |
304 | while (1) { |
305 | if (s_read(&c,1) != 1) |
306 | return 0; |
c5e9c988 |
307 | if (vsp < vstring+sizeof(vstring)-1) |
308 | *vsp++ = c; |
374330e2 |
309 | if (i >= 0) { |
310 | if (c == '-') { |
311 | version[i] = '\0'; |
312 | i = -1; |
313 | } else if (i < sizeof(version)-1) |
314 | version[i++] = c; |
315 | } |
316 | else if (c == '\n') |
317 | break; |
318 | } |
319 | |
c5e9c988 |
320 | *vsp = 0; |
321 | sprintf(vlog, "Server version: %s", vstring); |
322 | vlog[strcspn(vlog, "\r\n")] = '\0'; |
323 | logevent(vlog); |
324 | |
9697bfd2 |
325 | sprintf(vstring, "SSH-%s-PuTTY\n", |
326 | (ssh_versioncmp(version, "1.5") <= 0 ? version : "1.5")); |
c5e9c988 |
327 | sprintf(vlog, "We claim version: %s", vstring); |
328 | vlog[strcspn(vlog, "\r\n")] = '\0'; |
329 | logevent(vlog); |
374330e2 |
330 | s_write(vstring, strlen(vstring)); |
fef97f43 |
331 | return 1; |
374330e2 |
332 | } |
333 | |
334 | static void ssh_protocol(unsigned char *in, int inlen, int ispkt) { |
335 | int i, j, len; |
336 | unsigned char session_id[16]; |
337 | unsigned char *rsabuf, *keystr1, *keystr2; |
338 | unsigned char cookie[8]; |
339 | struct RSAKey servkey, hostkey; |
340 | struct MD5Context md5c; |
ccbfb941 |
341 | static unsigned long supported_ciphers_mask, supported_auths_mask; |
bea1ef5f |
342 | int cipher_type; |
374330e2 |
343 | |
344 | extern struct ssh_cipher ssh_3des; |
9697bfd2 |
345 | extern struct ssh_cipher ssh_des; |
bea1ef5f |
346 | extern struct ssh_cipher ssh_blowfish; |
374330e2 |
347 | |
348 | crBegin; |
349 | |
350 | random_init(); |
351 | |
352 | while (!ispkt) |
353 | crReturnV; |
354 | |
972a41c8 |
355 | if (pktin.type != SSH_SMSG_PUBLIC_KEY) |
374330e2 |
356 | fatalbox("Public key packet not received"); |
357 | |
c5e9c988 |
358 | logevent("Received public keys"); |
374330e2 |
359 | |
c5e9c988 |
360 | memcpy(cookie, pktin.body, 8); |
374330e2 |
361 | |
362 | i = makekey(pktin.body+8, &servkey, &keystr1); |
363 | |
364 | j = makekey(pktin.body+8+i, &hostkey, &keystr2); |
365 | |
c5e9c988 |
366 | /* |
367 | * Hash the host key and print the hash in the log box. Just as |
368 | * a last resort in case the registry's host key checking is |
369 | * compromised, we'll allow the user some ability to verify |
370 | * host keys by eye. |
371 | */ |
372 | MD5Init(&md5c); |
373 | MD5Update(&md5c, keystr2, hostkey.bytes); |
374 | MD5Final(session_id, &md5c); |
375 | { |
376 | char logmsg[80]; |
377 | int i; |
378 | logevent("Host key MD5 is:"); |
379 | strcpy(logmsg, " "); |
380 | for (i = 0; i < 16; i++) |
381 | sprintf(logmsg+strlen(logmsg), "%02x", session_id[i]); |
382 | logevent(logmsg); |
383 | } |
384 | |
ccbfb941 |
385 | supported_ciphers_mask = ((pktin.body[12+i+j] << 24) | |
386 | (pktin.body[13+i+j] << 16) | |
387 | (pktin.body[14+i+j] << 8) | |
388 | (pktin.body[15+i+j])); |
389 | |
390 | supported_auths_mask = ((pktin.body[16+i+j] << 24) | |
391 | (pktin.body[17+i+j] << 16) | |
392 | (pktin.body[18+i+j] << 8) | |
393 | (pktin.body[19+i+j])); |
bea1ef5f |
394 | |
c5e9c988 |
395 | MD5Init(&md5c); |
396 | |
374330e2 |
397 | MD5Update(&md5c, keystr2, hostkey.bytes); |
398 | MD5Update(&md5c, keystr1, servkey.bytes); |
399 | MD5Update(&md5c, pktin.body, 8); |
400 | |
401 | MD5Final(session_id, &md5c); |
402 | |
403 | for (i=0; i<32; i++) |
404 | session_key[i] = random_byte(); |
405 | |
406 | len = (hostkey.bytes > servkey.bytes ? hostkey.bytes : servkey.bytes); |
407 | |
408 | rsabuf = malloc(len); |
409 | if (!rsabuf) |
410 | fatalbox("Out of memory"); |
411 | |
89ee5268 |
412 | /* |
413 | * Verify the host key. |
414 | */ |
415 | { |
416 | /* |
417 | * First format the key into a string. |
418 | */ |
419 | int len = rsastr_len(&hostkey); |
420 | char *keystr = malloc(len); |
421 | if (!keystr) |
422 | fatalbox("Out of memory"); |
423 | rsastr_fmt(keystr, &hostkey); |
424 | verify_ssh_host_key(savedhost, keystr); |
425 | free(keystr); |
426 | } |
374330e2 |
427 | |
428 | for (i=0; i<32; i++) { |
429 | rsabuf[i] = session_key[i]; |
430 | if (i < 16) |
431 | rsabuf[i] ^= session_id[i]; |
432 | } |
433 | |
434 | if (hostkey.bytes > servkey.bytes) { |
435 | rsaencrypt(rsabuf, 32, &servkey); |
436 | rsaencrypt(rsabuf, servkey.bytes, &hostkey); |
437 | } else { |
438 | rsaencrypt(rsabuf, 32, &hostkey); |
439 | rsaencrypt(rsabuf, hostkey.bytes, &servkey); |
440 | } |
441 | |
c5e9c988 |
442 | logevent("Encrypted session key"); |
443 | |
bea1ef5f |
444 | cipher_type = cfg.cipher == CIPHER_BLOWFISH ? SSH_CIPHER_BLOWFISH : |
9697bfd2 |
445 | cfg.cipher == CIPHER_DES ? SSH_CIPHER_DES : |
bea1ef5f |
446 | SSH_CIPHER_3DES; |
447 | if ((supported_ciphers_mask & (1 << cipher_type)) == 0) { |
448 | c_write("Selected cipher not supported, falling back to 3DES\r\n", 53); |
449 | cipher_type = SSH_CIPHER_3DES; |
450 | } |
c5e9c988 |
451 | switch (cipher_type) { |
452 | case SSH_CIPHER_3DES: logevent("Using 3DES encryption"); break; |
453 | case SSH_CIPHER_DES: logevent("Using single-DES encryption"); break; |
454 | case SSH_CIPHER_BLOWFISH: logevent("Using Blowfish encryption"); break; |
455 | } |
bea1ef5f |
456 | |
972a41c8 |
457 | s_wrpkt_start(SSH_CMSG_SESSION_KEY, len+15); |
bea1ef5f |
458 | pktout.body[0] = cipher_type; |
374330e2 |
459 | memcpy(pktout.body+1, cookie, 8); |
460 | pktout.body[9] = (len*8) >> 8; |
461 | pktout.body[10] = (len*8) & 0xFF; |
462 | memcpy(pktout.body+11, rsabuf, len); |
463 | pktout.body[len+11] = pktout.body[len+12] = 0; /* protocol flags */ |
464 | pktout.body[len+13] = pktout.body[len+14] = 0; |
465 | s_wrpkt(); |
c5e9c988 |
466 | logevent("Trying to enable encryption..."); |
374330e2 |
467 | |
468 | free(rsabuf); |
469 | |
bea1ef5f |
470 | cipher = cipher_type == SSH_CIPHER_BLOWFISH ? &ssh_blowfish : |
9697bfd2 |
471 | cipher_type == SSH_CIPHER_DES ? &ssh_des : |
bea1ef5f |
472 | &ssh_3des; |
374330e2 |
473 | cipher->sesskey(session_key); |
474 | |
475 | do { crReturnV; } while (!ispkt); |
476 | |
972a41c8 |
477 | if (pktin.type != SSH_SMSG_SUCCESS) |
374330e2 |
478 | fatalbox("Encryption not successfully enabled"); |
479 | |
c5e9c988 |
480 | logevent("Successfully started encryption"); |
481 | |
374330e2 |
482 | fflush(stdout); |
483 | { |
484 | static char username[100]; |
485 | static int pos = 0; |
486 | static char c; |
487 | if (!*cfg.username) { |
488 | c_write("login as: ", 10); |
489 | while (pos >= 0) { |
490 | do { crReturnV; } while (ispkt); |
491 | while (inlen--) switch (c = *in++) { |
492 | case 10: case 13: |
493 | username[pos] = 0; |
494 | pos = -1; |
495 | break; |
496 | case 8: case 127: |
497 | if (pos > 0) { |
498 | c_write("\b \b", 3); |
499 | pos--; |
500 | } |
501 | break; |
502 | case 21: case 27: |
503 | while (pos > 0) { |
504 | c_write("\b \b", 3); |
505 | pos--; |
506 | } |
507 | break; |
508 | case 3: case 4: |
509 | random_save_seed(); |
510 | exit(0); |
511 | break; |
512 | default: |
40d24aa6 |
513 | if (((c >= ' ' && c <= '~') || |
514 | ((unsigned char)c >= 160)) && pos < 40) { |
374330e2 |
515 | username[pos++] = c; |
516 | c_write(&c, 1); |
517 | } |
518 | break; |
519 | } |
520 | } |
521 | c_write("\r\n", 2); |
522 | username[strcspn(username, "\n\r")] = '\0'; |
523 | } else { |
524 | char stuff[200]; |
525 | strncpy(username, cfg.username, 99); |
526 | username[99] = '\0'; |
527 | sprintf(stuff, "Sent username \"%s\".\r\n", username); |
528 | c_write(stuff, strlen(stuff)); |
529 | } |
972a41c8 |
530 | s_wrpkt_start(SSH_CMSG_USER, 4+strlen(username)); |
c5e9c988 |
531 | { |
532 | char userlog[20+sizeof(username)]; |
533 | sprintf(userlog, "Sent username \"%s\"", username); |
534 | logevent(userlog); |
535 | } |
374330e2 |
536 | pktout.body[0] = pktout.body[1] = pktout.body[2] = 0; |
537 | pktout.body[3] = strlen(username); |
538 | memcpy(pktout.body+4, username, strlen(username)); |
539 | s_wrpkt(); |
540 | } |
541 | |
542 | do { crReturnV; } while (!ispkt); |
543 | |
972a41c8 |
544 | while (pktin.type == SSH_SMSG_FAILURE) { |
374330e2 |
545 | static char password[100]; |
546 | static int pos; |
547 | static char c; |
ccbfb941 |
548 | static int pwpkt_type; |
549 | |
550 | /* |
551 | * Show password prompt, having first obtained it via a TIS |
552 | * exchange if we're doing TIS authentication. |
553 | */ |
554 | pwpkt_type = SSH_CMSG_AUTH_PASSWORD; |
555 | if (pktin.type == SSH_SMSG_FAILURE && |
556 | cfg.try_tis_auth && |
557 | (supported_auths_mask & (1<<SSH_AUTH_TIS))) { |
558 | pwpkt_type = SSH_CMSG_AUTH_TIS_RESPONSE; |
c5e9c988 |
559 | logevent("Requested TIS authentication"); |
ccbfb941 |
560 | s_wrpkt_start(SSH_CMSG_AUTH_TIS, 0); |
561 | s_wrpkt(); |
562 | do { crReturnV; } while (!ispkt); |
563 | if (pktin.type != SSH_SMSG_AUTH_TIS_CHALLENGE) { |
c5e9c988 |
564 | logevent("TIS authentication declined"); |
ccbfb941 |
565 | c_write("TIS authentication refused.\r\n", 29); |
566 | } else { |
567 | int challengelen = ((pktin.body[0] << 24) | |
568 | (pktin.body[1] << 16) | |
569 | (pktin.body[2] << 8) | |
570 | (pktin.body[3])); |
c5e9c988 |
571 | logevent("Received TIS challenge"); |
ccbfb941 |
572 | c_write(pktin.body+4, challengelen); |
573 | } |
574 | } |
575 | if (pwpkt_type == SSH_CMSG_AUTH_PASSWORD) |
576 | c_write("password: ", 10); |
577 | |
374330e2 |
578 | pos = 0; |
579 | while (pos >= 0) { |
580 | do { crReturnV; } while (ispkt); |
581 | while (inlen--) switch (c = *in++) { |
582 | case 10: case 13: |
583 | password[pos] = 0; |
584 | pos = -1; |
585 | break; |
586 | case 8: case 127: |
587 | if (pos > 0) |
588 | pos--; |
589 | break; |
590 | case 21: case 27: |
591 | pos = 0; |
592 | break; |
593 | case 3: case 4: |
594 | random_save_seed(); |
595 | exit(0); |
596 | break; |
597 | default: |
40d24aa6 |
598 | if (((c >= ' ' && c <= '~') || |
599 | ((unsigned char)c >= 160)) && pos < 40) |
374330e2 |
600 | password[pos++] = c; |
601 | break; |
602 | } |
603 | } |
604 | c_write("\r\n", 2); |
ccbfb941 |
605 | s_wrpkt_start(pwpkt_type, 4+strlen(password)); |
374330e2 |
606 | pktout.body[0] = pktout.body[1] = pktout.body[2] = 0; |
607 | pktout.body[3] = strlen(password); |
608 | memcpy(pktout.body+4, password, strlen(password)); |
609 | s_wrpkt(); |
c5e9c988 |
610 | logevent("Sent password"); |
374330e2 |
611 | memset(password, 0, strlen(password)); |
612 | do { crReturnV; } while (!ispkt); |
613 | if (pktin.type == 15) { |
614 | c_write("Access denied\r\n", 15); |
c5e9c988 |
615 | logevent("Authentication refused"); |
374330e2 |
616 | } else if (pktin.type != 14) { |
617 | fatalbox("Strange packet received, type %d", pktin.type); |
618 | } |
619 | } |
620 | |
c5e9c988 |
621 | logevent("Authentication successful"); |
622 | |
fef97f43 |
623 | if (!cfg.nopty) { |
624 | i = strlen(cfg.termtype); |
972a41c8 |
625 | s_wrpkt_start(SSH_CMSG_REQUEST_PTY, i+5*4+1); |
fef97f43 |
626 | pktout.body[0] = (i >> 24) & 0xFF; |
627 | pktout.body[1] = (i >> 16) & 0xFF; |
628 | pktout.body[2] = (i >> 8) & 0xFF; |
629 | pktout.body[3] = i & 0xFF; |
630 | memcpy(pktout.body+4, cfg.termtype, i); |
631 | i += 4; |
632 | pktout.body[i++] = (rows >> 24) & 0xFF; |
633 | pktout.body[i++] = (rows >> 16) & 0xFF; |
634 | pktout.body[i++] = (rows >> 8) & 0xFF; |
635 | pktout.body[i++] = rows & 0xFF; |
636 | pktout.body[i++] = (cols >> 24) & 0xFF; |
637 | pktout.body[i++] = (cols >> 16) & 0xFF; |
638 | pktout.body[i++] = (cols >> 8) & 0xFF; |
639 | pktout.body[i++] = cols & 0xFF; |
640 | memset(pktout.body+i, 0, 9); /* 0 pixwidth, 0 pixheight, 0.b endofopt */ |
641 | s_wrpkt(); |
642 | ssh_state = SSH_STATE_INTERMED; |
643 | do { crReturnV; } while (!ispkt); |
ccbfb941 |
644 | if (pktin.type != SSH_SMSG_SUCCESS && pktin.type != SSH_SMSG_FAILURE) { |
fef97f43 |
645 | fatalbox("Protocol confusion"); |
ccbfb941 |
646 | } else if (pktin.type == SSH_SMSG_FAILURE) { |
fef97f43 |
647 | c_write("Server refused to allocate pty\r\n", 32); |
648 | } |
c5e9c988 |
649 | logevent("Allocated pty"); |
374330e2 |
650 | } |
651 | |
972a41c8 |
652 | s_wrpkt_start(SSH_CMSG_EXEC_SHELL, 0); |
374330e2 |
653 | s_wrpkt(); |
c5e9c988 |
654 | logevent("Started session"); |
374330e2 |
655 | |
656 | ssh_state = SSH_STATE_SESSION; |
657 | if (size_needed) |
658 | ssh_size(); |
659 | |
660 | while (1) { |
661 | crReturnV; |
662 | if (ispkt) { |
972a41c8 |
663 | if (pktin.type == SSH_SMSG_STDOUT_DATA || |
664 | pktin.type == SSH_SMSG_STDERR_DATA) { |
374330e2 |
665 | long len = 0; |
666 | for (i = 0; i < 4; i++) |
667 | len = (len << 8) + pktin.body[i]; |
a0e1c8b1 |
668 | if (len+4 != pktin.length) { |
669 | logevent("Received data packet with bogus string length" |
670 | ", ignoring"); |
671 | } else |
672 | c_write(pktin.body+4, len); |
972a41c8 |
673 | } else if (pktin.type == SSH_MSG_DISCONNECT) { |
21248260 |
674 | ssh_state = SSH_STATE_CLOSED; |
c5e9c988 |
675 | logevent("Received disconnect request"); |
ccbfb941 |
676 | } else if (pktin.type == SSH_SMSG_SUCCESS) { |
972a41c8 |
677 | /* may be from EXEC_SHELL on some servers */ |
ccbfb941 |
678 | } else if (pktin.type == SSH_SMSG_FAILURE) { |
972a41c8 |
679 | /* may be from EXEC_SHELL on some servers |
374330e2 |
680 | * if no pty is available or in other odd cases. Ignore */ |
972a41c8 |
681 | } else if (pktin.type == SSH_SMSG_EXITSTATUS) { |
682 | s_wrpkt_start(SSH_CMSG_EXIT_CONFIRMATION, 0); |
374330e2 |
683 | s_wrpkt(); |
684 | } else { |
685 | fatalbox("Strange packet received: type %d", pktin.type); |
686 | } |
687 | } else { |
972a41c8 |
688 | s_wrpkt_start(SSH_CMSG_STDIN_DATA, 4+inlen); |
374330e2 |
689 | pktout.body[0] = (inlen >> 24) & 0xFF; |
690 | pktout.body[1] = (inlen >> 16) & 0xFF; |
691 | pktout.body[2] = (inlen >> 8) & 0xFF; |
692 | pktout.body[3] = inlen & 0xFF; |
693 | memcpy(pktout.body+4, in, inlen); |
694 | s_wrpkt(); |
695 | } |
696 | } |
697 | |
698 | crFinishV; |
699 | } |
700 | |
701 | /* |
702 | * Called to set up the connection. Will arrange for WM_NETEVENT |
703 | * messages to be passed to the specified window, whose window |
704 | * procedure should then call telnet_msg(). |
705 | * |
706 | * Returns an error message, or NULL on success. |
707 | * |
708 | * Also places the canonical host name into `realhost'. |
709 | */ |
710 | static char *ssh_init (HWND hwnd, char *host, int port, char **realhost) { |
711 | SOCKADDR_IN addr; |
712 | struct hostent *h; |
713 | unsigned long a; |
714 | #ifdef FWHACK |
715 | char *FWhost; |
716 | int FWport; |
717 | #endif |
8f203108 |
718 | |
719 | #ifdef MSCRYPTOAPI |
720 | if(crypto_startup() == 0) |
721 | return "Microsoft high encryption pack not installed!"; |
722 | #endif |
374330e2 |
723 | |
724 | savedhost = malloc(1+strlen(host)); |
725 | if (!savedhost) |
726 | fatalbox("Out of memory"); |
727 | strcpy(savedhost, host); |
728 | |
729 | #ifdef FWHACK |
730 | FWhost = host; |
731 | FWport = port; |
732 | host = FWSTR; |
733 | port = 23; |
734 | #endif |
735 | |
736 | /* |
737 | * Try to find host. |
738 | */ |
739 | if ( (a = inet_addr(host)) == (unsigned long) INADDR_NONE) { |
740 | if ( (h = gethostbyname(host)) == NULL) |
741 | switch (WSAGetLastError()) { |
742 | case WSAENETDOWN: return "Network is down"; |
743 | case WSAHOST_NOT_FOUND: case WSANO_DATA: |
744 | return "Host does not exist"; |
745 | case WSATRY_AGAIN: return "Host not found"; |
746 | default: return "gethostbyname: unknown error"; |
747 | } |
748 | memcpy (&a, h->h_addr, sizeof(a)); |
749 | *realhost = h->h_name; |
750 | } else |
751 | *realhost = host; |
752 | #ifdef FWHACK |
753 | *realhost = FWhost; |
754 | #endif |
755 | a = ntohl(a); |
756 | |
757 | if (port < 0) |
758 | port = 22; /* default ssh port */ |
759 | |
760 | /* |
761 | * Open socket. |
762 | */ |
763 | s = socket(AF_INET, SOCK_STREAM, 0); |
764 | if (s == INVALID_SOCKET) |
765 | switch (WSAGetLastError()) { |
766 | case WSAENETDOWN: return "Network is down"; |
767 | case WSAEAFNOSUPPORT: return "TCP/IP support not present"; |
768 | default: return "socket(): unknown error"; |
769 | } |
770 | |
771 | /* |
772 | * Bind to local address. |
773 | */ |
774 | addr.sin_family = AF_INET; |
775 | addr.sin_addr.s_addr = htonl(INADDR_ANY); |
776 | addr.sin_port = htons(0); |
777 | if (bind (s, (struct sockaddr *)&addr, sizeof(addr)) == SOCKET_ERROR) |
778 | switch (WSAGetLastError()) { |
779 | case WSAENETDOWN: return "Network is down"; |
780 | default: return "bind(): unknown error"; |
781 | } |
782 | |
783 | /* |
784 | * Connect to remote address. |
785 | */ |
786 | addr.sin_addr.s_addr = htonl(a); |
787 | addr.sin_port = htons((short)port); |
788 | if (connect (s, (struct sockaddr *)&addr, sizeof(addr)) == SOCKET_ERROR) |
789 | switch (WSAGetLastError()) { |
790 | case WSAENETDOWN: return "Network is down"; |
791 | case WSAECONNREFUSED: return "Connection refused"; |
792 | case WSAENETUNREACH: return "Network is unreachable"; |
793 | case WSAEHOSTUNREACH: return "No route to host"; |
794 | default: return "connect(): unknown error"; |
795 | } |
796 | |
797 | #ifdef FWHACK |
798 | send(s, "connect ", 8, 0); |
799 | send(s, FWhost, strlen(FWhost), 0); |
800 | { |
801 | char buf[20]; |
802 | sprintf(buf, " %d\n", FWport); |
803 | send (s, buf, strlen(buf), 0); |
804 | } |
805 | #endif |
806 | |
807 | if (!do_ssh_init()) |
808 | return "Protocol initialisation error"; |
809 | |
810 | if (WSAAsyncSelect (s, hwnd, WM_NETEVENT, FD_READ | FD_CLOSE) == SOCKET_ERROR) |
811 | switch (WSAGetLastError()) { |
812 | case WSAENETDOWN: return "Network is down"; |
813 | default: return "WSAAsyncSelect(): unknown error"; |
814 | } |
815 | |
816 | return NULL; |
817 | } |
818 | |
819 | /* |
820 | * Process a WM_NETEVENT message. Will return 0 if the connection |
821 | * has closed, or <0 for a socket error. |
822 | */ |
823 | static int ssh_msg (WPARAM wParam, LPARAM lParam) { |
824 | int ret; |
825 | char buf[256]; |
826 | |
8ce72d2c |
827 | /* |
828 | * Because reading less than the whole of the available pending |
829 | * data can generate an FD_READ event, we need to allow for the |
830 | * possibility that FD_READ may arrive with FD_CLOSE already in |
831 | * the queue; so it's possible that we can get here even with s |
832 | * invalid. If so, we return 1 and don't worry about it. |
833 | */ |
834 | if (s == INVALID_SOCKET) |
835 | return 1; |
374330e2 |
836 | |
837 | if (WSAGETSELECTERROR(lParam) != 0) |
838 | return -WSAGETSELECTERROR(lParam); |
839 | |
840 | switch (WSAGETSELECTEVENT(lParam)) { |
841 | case FD_READ: |
8ce72d2c |
842 | case FD_CLOSE: |
374330e2 |
843 | ret = recv(s, buf, sizeof(buf), 0); |
844 | if (ret < 0 && WSAGetLastError() == WSAEWOULDBLOCK) |
845 | return 1; |
846 | if (ret < 0) /* any _other_ error */ |
847 | return -10000-WSAGetLastError(); |
848 | if (ret == 0) { |
849 | s = INVALID_SOCKET; |
8ce72d2c |
850 | return 0; |
374330e2 |
851 | } |
852 | ssh_gotdata (buf, ret); |
853 | return 1; |
374330e2 |
854 | } |
855 | return 1; /* shouldn't happen, but WTF */ |
856 | } |
857 | |
858 | /* |
859 | * Called to send data down the Telnet connection. |
860 | */ |
861 | static void ssh_send (char *buf, int len) { |
862 | if (s == INVALID_SOCKET) |
863 | return; |
864 | |
865 | ssh_protocol(buf, len, 0); |
866 | } |
867 | |
868 | /* |
869 | * Called to set the size of the window from Telnet's POV. |
870 | */ |
871 | static void ssh_size(void) { |
872 | switch (ssh_state) { |
873 | case SSH_STATE_BEFORE_SIZE: |
21248260 |
874 | case SSH_STATE_CLOSED: |
374330e2 |
875 | break; /* do nothing */ |
876 | case SSH_STATE_INTERMED: |
877 | size_needed = TRUE; /* buffer for later */ |
878 | break; |
879 | case SSH_STATE_SESSION: |
fef97f43 |
880 | if (!cfg.nopty) { |
881 | s_wrpkt_start(11, 16); |
882 | pktout.body[0] = (rows >> 24) & 0xFF; |
883 | pktout.body[1] = (rows >> 16) & 0xFF; |
884 | pktout.body[2] = (rows >> 8) & 0xFF; |
885 | pktout.body[3] = rows & 0xFF; |
886 | pktout.body[4] = (cols >> 24) & 0xFF; |
887 | pktout.body[5] = (cols >> 16) & 0xFF; |
888 | pktout.body[6] = (cols >> 8) & 0xFF; |
889 | pktout.body[7] = cols & 0xFF; |
890 | memset(pktout.body+8, 0, 8); |
891 | s_wrpkt(); |
892 | } |
374330e2 |
893 | } |
894 | } |
895 | |
896 | /* |
897 | * (Send Telnet special codes) |
898 | */ |
899 | static void ssh_special (Telnet_Special code) { |
900 | /* do nothing */ |
901 | } |
902 | |
903 | Backend ssh_backend = { |
904 | ssh_init, |
905 | ssh_msg, |
906 | ssh_send, |
907 | ssh_size, |
908 | ssh_special |
909 | }; |