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1 | #include <stdio.h> |
2 | #include <stdlib.h> |
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3 | #include <stdarg.h> |
4 | #include <assert.h> |
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5 | #include <winsock.h> |
6 | |
7 | #include "putty.h" |
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8 | #include "ssh.h" |
9 | #include "scp.h" |
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10 | |
11 | #ifndef FALSE |
12 | #define FALSE 0 |
13 | #endif |
14 | #ifndef TRUE |
15 | #define TRUE 1 |
16 | #endif |
17 | |
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18 | #define logevent(s) { logevent(s); \ |
19 | if (IS_SCP && (scp_flags & SCP_VERBOSE) != 0) \ |
20 | fprintf(stderr, "%s\n", s); } |
21 | |
22 | #define SSH_MSG_DISCONNECT 1 |
23 | #define SSH_SMSG_PUBLIC_KEY 2 |
24 | #define SSH_CMSG_SESSION_KEY 3 |
25 | #define SSH_CMSG_USER 4 |
26 | #define SSH_CMSG_AUTH_PASSWORD 9 |
27 | #define SSH_CMSG_REQUEST_PTY 10 |
28 | #define SSH_CMSG_WINDOW_SIZE 11 |
29 | #define SSH_CMSG_EXEC_SHELL 12 |
30 | #define SSH_CMSG_EXEC_CMD 13 |
31 | #define SSH_SMSG_SUCCESS 14 |
32 | #define SSH_SMSG_FAILURE 15 |
33 | #define SSH_CMSG_STDIN_DATA 16 |
34 | #define SSH_SMSG_STDOUT_DATA 17 |
35 | #define SSH_SMSG_STDERR_DATA 18 |
36 | #define SSH_CMSG_EOF 19 |
37 | #define SSH_SMSG_EXIT_STATUS 20 |
38 | #define SSH_CMSG_EXIT_CONFIRMATION 33 |
39 | #define SSH_MSG_IGNORE 32 |
40 | #define SSH_MSG_DEBUG 36 |
41 | #define SSH_CMSG_AUTH_TIS 39 |
42 | #define SSH_SMSG_AUTH_TIS_CHALLENGE 40 |
43 | #define SSH_CMSG_AUTH_TIS_RESPONSE 41 |
44 | |
45 | #define SSH_AUTH_TIS 5 |
46 | |
47 | #define GET_32BIT(cp) \ |
48 | (((unsigned long)(unsigned char)(cp)[0] << 24) | \ |
49 | ((unsigned long)(unsigned char)(cp)[1] << 16) | \ |
50 | ((unsigned long)(unsigned char)(cp)[2] << 8) | \ |
51 | ((unsigned long)(unsigned char)(cp)[3])) |
52 | |
53 | #define PUT_32BIT(cp, value) { \ |
54 | (cp)[0] = (unsigned char)((value) >> 24); \ |
55 | (cp)[1] = (unsigned char)((value) >> 16); \ |
56 | (cp)[2] = (unsigned char)((value) >> 8); \ |
57 | (cp)[3] = (unsigned char)(value); } |
58 | |
59 | enum { PKT_END, PKT_INT, PKT_CHAR, PKT_DATA, PKT_STR }; |
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60 | |
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61 | /* Coroutine mechanics for the sillier bits of the code */ |
62 | #define crBegin1 static int crLine = 0; |
63 | #define crBegin2 switch(crLine) { case 0:; |
64 | #define crBegin crBegin1; crBegin2; |
65 | #define crFinish(z) } crLine = 0; return (z) |
66 | #define crFinishV } crLine = 0; return |
67 | #define crReturn(z) \ |
68 | do {\ |
69 | crLine=__LINE__; return (z); case __LINE__:;\ |
70 | } while (0) |
71 | #define crReturnV \ |
72 | do {\ |
73 | crLine=__LINE__; return; case __LINE__:;\ |
74 | } while (0) |
75 | #define crStop(z) do{ crLine = 0; return (z); }while(0) |
76 | #define crStopV do{ crLine = 0; return; }while(0) |
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77 | #define crWaitUntil(c) do { crReturn(0); } while (!(c)) |
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78 | |
79 | static SOCKET s = INVALID_SOCKET; |
80 | |
81 | static unsigned char session_key[32]; |
82 | static struct ssh_cipher *cipher = NULL; |
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83 | int scp_flags = 0; |
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84 | int (*ssh_get_password)(const char *prompt, char *str, int maxlen) = NULL; |
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85 | |
86 | static char *savedhost; |
87 | |
88 | static enum { |
89 | SSH_STATE_BEFORE_SIZE, |
90 | SSH_STATE_INTERMED, |
21248260 |
91 | SSH_STATE_SESSION, |
92 | SSH_STATE_CLOSED |
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93 | } ssh_state = SSH_STATE_BEFORE_SIZE; |
94 | |
95 | static int size_needed = FALSE; |
96 | |
97 | static void s_write (char *buf, int len) { |
98 | while (len > 0) { |
99 | int i = send (s, buf, len, 0); |
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100 | if (IS_SCP) { |
101 | noise_ultralight(i); |
102 | if (i <= 0) |
103 | fatalbox("Lost connection while sending"); |
104 | } |
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105 | if (i > 0) |
106 | len -= i, buf += i; |
107 | } |
108 | } |
109 | |
110 | static int s_read (char *buf, int len) { |
111 | int ret = 0; |
112 | while (len > 0) { |
113 | int i = recv (s, buf, len, 0); |
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114 | if (IS_SCP) |
115 | noise_ultralight(i); |
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116 | if (i > 0) |
117 | len -= i, buf += i, ret += i; |
118 | else |
119 | return i; |
120 | } |
121 | return ret; |
122 | } |
123 | |
124 | static void c_write (char *buf, int len) { |
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125 | if (IS_SCP) { |
126 | if (len > 0 && buf[len-1] == '\n') len--; |
127 | if (len > 0 && buf[len-1] == '\r') len--; |
128 | if (len > 0) { fwrite(buf, len, 1, stderr); fputc('\n', stderr); } |
129 | return; |
130 | } |
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131 | while (len--) |
132 | c_write1(*buf++); |
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133 | } |
134 | |
135 | struct Packet { |
136 | long length; |
137 | int type; |
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138 | unsigned char *data; |
139 | unsigned char *body; |
140 | long maxlen; |
141 | }; |
142 | |
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143 | static struct Packet pktin = { 0, 0, NULL, NULL, 0 }; |
144 | static struct Packet pktout = { 0, 0, NULL, NULL, 0 }; |
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145 | |
146 | static void ssh_protocol(unsigned char *in, int inlen, int ispkt); |
147 | static void ssh_size(void); |
148 | |
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149 | |
150 | /* |
151 | * Collect incoming data in the incoming packet buffer. |
152 | * Decihper and verify the packet when it is completely read. |
153 | * Drop SSH_MSG_DEBUG and SSH_MSG_IGNORE packets. |
154 | * Update the *data and *datalen variables. |
155 | * Return the additional nr of bytes needed, or 0 when |
156 | * a complete packet is available. |
157 | */ |
158 | static int s_rdpkt(unsigned char **data, int *datalen) |
159 | { |
160 | static long len, pad, biglen, to_read; |
572f871e |
161 | static unsigned long realcrc, gotcrc; |
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162 | static unsigned char *p; |
163 | static int i; |
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164 | |
165 | crBegin; |
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166 | |
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167 | next_packet: |
37508af4 |
168 | |
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169 | pktin.type = 0; |
170 | pktin.length = 0; |
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171 | |
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172 | for (i = len = 0; i < 4; i++) { |
173 | while ((*datalen) == 0) |
174 | crReturn(4-i); |
175 | len = (len << 8) + **data; |
176 | (*data)++, (*datalen)--; |
177 | } |
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178 | |
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179 | #ifdef FWHACK |
180 | if (len == 0x52656d6f) { /* "Remo"te server has closed ... */ |
181 | len = 0x300; /* big enough to carry to end */ |
182 | } |
183 | #endif |
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184 | |
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185 | pad = 8 - (len % 8); |
186 | biglen = len + pad; |
187 | pktin.length = len - 5; |
188 | |
189 | if (pktin.maxlen < biglen) { |
190 | pktin.maxlen = biglen; |
8f203108 |
191 | #ifdef MSCRYPTOAPI |
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192 | /* Allocate enough buffer space for extra block |
193 | * for MS CryptEncrypt() */ |
194 | pktin.data = (pktin.data == NULL ? malloc(biglen+8) : |
195 | realloc(pktin.data, biglen+8)); |
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196 | #else |
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197 | pktin.data = (pktin.data == NULL ? malloc(biglen) : |
198 | realloc(pktin.data, biglen)); |
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199 | #endif |
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200 | if (!pktin.data) |
201 | fatalbox("Out of memory"); |
202 | } |
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203 | |
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204 | to_read = biglen; |
205 | p = pktin.data; |
206 | while (to_read > 0) { |
207 | static int chunk; |
208 | chunk = to_read; |
209 | while ((*datalen) == 0) |
210 | crReturn(to_read); |
211 | if (chunk > (*datalen)) |
212 | chunk = (*datalen); |
213 | memcpy(p, *data, chunk); |
214 | *data += chunk; |
215 | *datalen -= chunk; |
216 | p += chunk; |
217 | to_read -= chunk; |
218 | } |
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219 | |
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220 | if (cipher) |
221 | cipher->decrypt(pktin.data, biglen); |
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222 | |
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223 | pktin.type = pktin.data[pad]; |
224 | pktin.body = pktin.data + pad + 1; |
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225 | |
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226 | realcrc = crc32(pktin.data, biglen-4); |
227 | gotcrc = GET_32BIT(pktin.data+biglen-4); |
228 | if (gotcrc != realcrc) { |
229 | fatalbox("Incorrect CRC received on packet"); |
230 | } |
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231 | |
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232 | if (pktin.type == SSH_SMSG_STDOUT_DATA || |
233 | pktin.type == SSH_SMSG_STDERR_DATA || |
234 | pktin.type == SSH_MSG_DEBUG || |
235 | pktin.type == SSH_SMSG_AUTH_TIS_CHALLENGE) { |
236 | long strlen = GET_32BIT(pktin.body); |
237 | if (strlen + 4 != pktin.length) |
238 | fatalbox("Received data packet with bogus string length"); |
239 | } |
240 | |
241 | if (pktin.type == SSH_MSG_DEBUG) { |
242 | /* log debug message */ |
243 | char buf[80]; |
244 | int strlen = GET_32BIT(pktin.body); |
245 | strcpy(buf, "Remote: "); |
246 | if (strlen > 70) strlen = 70; |
247 | memcpy(buf+8, pktin.body+4, strlen); |
248 | buf[8+strlen] = '\0'; |
249 | logevent(buf); |
250 | goto next_packet; |
251 | } else if (pktin.type == SSH_MSG_IGNORE) { |
252 | /* do nothing */ |
253 | goto next_packet; |
254 | } |
255 | |
256 | crFinish(0); |
257 | } |
258 | |
259 | static void ssh_gotdata(unsigned char *data, int datalen) |
260 | { |
261 | while (datalen > 0) { |
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262 | if ( s_rdpkt(&data, &datalen) == 0 ) { |
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263 | ssh_protocol(NULL, 0, 1); |
85ee8208 |
264 | if (ssh_state == SSH_STATE_CLOSED) { |
265 | return; |
266 | } |
267 | } |
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268 | } |
374330e2 |
269 | } |
270 | |
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271 | |
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272 | static void s_wrpkt_start(int type, int len) { |
273 | int pad, biglen; |
274 | |
275 | len += 5; /* type and CRC */ |
276 | pad = 8 - (len%8); |
277 | biglen = len + pad; |
278 | |
279 | pktout.length = len-5; |
280 | if (pktout.maxlen < biglen) { |
281 | pktout.maxlen = biglen; |
8f203108 |
282 | #ifdef MSCRYPTOAPI |
fb09bf1c |
283 | /* Allocate enough buffer space for extra block |
8f203108 |
284 | * for MS CryptEncrypt() */ |
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285 | pktout.data = (pktout.data == NULL ? malloc(biglen+12) : |
286 | realloc(pktout.data, biglen+12)); |
8f203108 |
287 | #else |
c1f5f956 |
288 | pktout.data = (pktout.data == NULL ? malloc(biglen+4) : |
289 | realloc(pktout.data, biglen+4)); |
8f203108 |
290 | #endif |
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291 | if (!pktout.data) |
292 | fatalbox("Out of memory"); |
293 | } |
294 | |
295 | pktout.type = type; |
296 | pktout.body = pktout.data+4+pad+1; |
297 | } |
298 | |
299 | static void s_wrpkt(void) { |
300 | int pad, len, biglen, i; |
301 | unsigned long crc; |
302 | |
303 | len = pktout.length + 5; /* type and CRC */ |
304 | pad = 8 - (len%8); |
305 | biglen = len + pad; |
306 | |
307 | pktout.body[-1] = pktout.type; |
308 | for (i=0; i<pad; i++) |
309 | pktout.data[i+4] = random_byte(); |
310 | crc = crc32(pktout.data+4, biglen-4); |
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311 | PUT_32BIT(pktout.data+biglen, crc); |
312 | PUT_32BIT(pktout.data, len); |
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313 | |
314 | if (cipher) |
315 | cipher->encrypt(pktout.data+4, biglen); |
316 | |
317 | s_write(pktout.data, biglen+4); |
318 | } |
319 | |
fb09bf1c |
320 | /* |
321 | * Construct a packet with the specified contents and |
322 | * send it to the server. |
323 | */ |
324 | static void send_packet(int pkttype, ...) |
325 | { |
326 | va_list args; |
327 | unsigned char *p, *argp, argchar; |
328 | unsigned long argint; |
329 | int pktlen, argtype, arglen; |
330 | |
331 | pktlen = 0; |
332 | va_start(args, pkttype); |
333 | while ((argtype = va_arg(args, int)) != PKT_END) { |
334 | switch (argtype) { |
335 | case PKT_INT: |
336 | (void) va_arg(args, int); |
337 | pktlen += 4; |
338 | break; |
339 | case PKT_CHAR: |
340 | (void) va_arg(args, char); |
341 | pktlen++; |
342 | break; |
343 | case PKT_DATA: |
344 | (void) va_arg(args, unsigned char *); |
345 | arglen = va_arg(args, int); |
346 | pktlen += arglen; |
347 | break; |
348 | case PKT_STR: |
349 | argp = va_arg(args, unsigned char *); |
350 | arglen = strlen(argp); |
351 | pktlen += 4 + arglen; |
352 | break; |
353 | default: |
354 | assert(0); |
355 | } |
356 | } |
357 | va_end(args); |
358 | |
359 | s_wrpkt_start(pkttype, pktlen); |
360 | p = pktout.body; |
361 | |
362 | va_start(args, pkttype); |
363 | while ((argtype = va_arg(args, int)) != PKT_END) { |
364 | switch (argtype) { |
365 | case PKT_INT: |
366 | argint = va_arg(args, int); |
367 | PUT_32BIT(p, argint); |
368 | p += 4; |
369 | break; |
370 | case PKT_CHAR: |
371 | argchar = va_arg(args, unsigned char); |
372 | *p = argchar; |
373 | p++; |
374 | break; |
375 | case PKT_DATA: |
376 | argp = va_arg(args, unsigned char *); |
377 | arglen = va_arg(args, int); |
378 | memcpy(p, argp, arglen); |
379 | p += arglen; |
380 | break; |
381 | case PKT_STR: |
382 | argp = va_arg(args, unsigned char *); |
383 | arglen = strlen(argp); |
384 | PUT_32BIT(p, arglen); |
385 | memcpy(p + 4, argp, arglen); |
386 | p += 4 + arglen; |
387 | break; |
388 | } |
389 | } |
390 | va_end(args); |
391 | |
392 | s_wrpkt(); |
393 | } |
394 | |
395 | |
396 | /* |
397 | * Connect to specified host and port. |
398 | * Returns an error message, or NULL on success. |
399 | * Also places the canonical host name into `realhost'. |
400 | */ |
401 | static char *connect_to_host(char *host, int port, char **realhost) |
402 | { |
403 | SOCKADDR_IN addr; |
404 | struct hostent *h; |
405 | unsigned long a; |
406 | #ifdef FWHACK |
407 | char *FWhost; |
408 | int FWport; |
409 | #endif |
410 | |
411 | savedhost = malloc(1+strlen(host)); |
412 | if (!savedhost) |
413 | fatalbox("Out of memory"); |
414 | strcpy(savedhost, host); |
415 | |
416 | if (port < 0) |
417 | port = 22; /* default ssh port */ |
418 | |
419 | #ifdef FWHACK |
420 | FWhost = host; |
421 | FWport = port; |
422 | host = FWSTR; |
423 | port = 23; |
424 | #endif |
425 | |
426 | /* |
427 | * Try to find host. |
428 | */ |
429 | if ( (a = inet_addr(host)) == (unsigned long) INADDR_NONE) { |
430 | if ( (h = gethostbyname(host)) == NULL) |
431 | switch (WSAGetLastError()) { |
432 | case WSAENETDOWN: return "Network is down"; |
433 | case WSAHOST_NOT_FOUND: case WSANO_DATA: |
434 | return "Host does not exist"; |
435 | case WSATRY_AGAIN: return "Host not found"; |
436 | default: return "gethostbyname: unknown error"; |
437 | } |
438 | memcpy (&a, h->h_addr, sizeof(a)); |
439 | *realhost = h->h_name; |
440 | } else |
441 | *realhost = host; |
442 | #ifdef FWHACK |
443 | *realhost = FWhost; |
444 | #endif |
445 | a = ntohl(a); |
446 | |
447 | /* |
448 | * Open socket. |
449 | */ |
450 | s = socket(AF_INET, SOCK_STREAM, 0); |
451 | if (s == INVALID_SOCKET) |
452 | switch (WSAGetLastError()) { |
453 | case WSAENETDOWN: return "Network is down"; |
454 | case WSAEAFNOSUPPORT: return "TCP/IP support not present"; |
455 | default: return "socket(): unknown error"; |
456 | } |
457 | |
458 | /* |
459 | * Bind to local address. |
460 | */ |
461 | addr.sin_family = AF_INET; |
462 | addr.sin_addr.s_addr = htonl(INADDR_ANY); |
463 | addr.sin_port = htons(0); |
464 | if (bind (s, (struct sockaddr *)&addr, sizeof(addr)) == SOCKET_ERROR) |
465 | switch (WSAGetLastError()) { |
466 | case WSAENETDOWN: return "Network is down"; |
467 | default: return "bind(): unknown error"; |
468 | } |
469 | |
470 | /* |
471 | * Connect to remote address. |
472 | */ |
473 | addr.sin_addr.s_addr = htonl(a); |
474 | addr.sin_port = htons((short)port); |
475 | if (connect (s, (struct sockaddr *)&addr, sizeof(addr)) == SOCKET_ERROR) |
476 | switch (WSAGetLastError()) { |
477 | case WSAENETDOWN: return "Network is down"; |
478 | case WSAECONNREFUSED: return "Connection refused"; |
479 | case WSAENETUNREACH: return "Network is unreachable"; |
480 | case WSAEHOSTUNREACH: return "No route to host"; |
481 | default: return "connect(): unknown error"; |
482 | } |
483 | |
484 | #ifdef FWHACK |
485 | send(s, "connect ", 8, 0); |
486 | send(s, FWhost, strlen(FWhost), 0); |
487 | { |
488 | char buf[20]; |
489 | sprintf(buf, " %d\n", FWport); |
490 | send (s, buf, strlen(buf), 0); |
491 | } |
492 | #endif |
493 | |
494 | return NULL; |
495 | } |
496 | |
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497 | static int ssh_versioncmp(char *a, char *b) { |
498 | char *ae, *be; |
499 | unsigned long av, bv; |
500 | |
43aa02a7 |
501 | av = strtoul(a, &ae, 10); |
502 | bv = strtoul(b, &be, 10); |
9697bfd2 |
503 | if (av != bv) return (av < bv ? -1 : +1); |
504 | if (*ae == '.') ae++; |
505 | if (*be == '.') be++; |
43aa02a7 |
506 | av = strtoul(ae, &ae, 10); |
507 | bv = strtoul(be, &be, 10); |
9697bfd2 |
508 | if (av != bv) return (av < bv ? -1 : +1); |
509 | return 0; |
510 | } |
511 | |
374330e2 |
512 | static int do_ssh_init(void) { |
c5e9c988 |
513 | char c, *vsp; |
374330e2 |
514 | char version[10]; |
c5e9c988 |
515 | char vstring[80]; |
516 | char vlog[sizeof(vstring)+20]; |
374330e2 |
517 | int i; |
518 | |
519 | #ifdef FWHACK |
520 | i = 0; |
521 | while (s_read(&c, 1) == 1) { |
522 | if (c == 'S' && i < 2) i++; |
523 | else if (c == 'S' && i == 2) i = 2; |
524 | else if (c == 'H' && i == 2) break; |
525 | else i = 0; |
526 | } |
527 | #else |
528 | if (s_read(&c,1) != 1 || c != 'S') return 0; |
529 | if (s_read(&c,1) != 1 || c != 'S') return 0; |
530 | if (s_read(&c,1) != 1 || c != 'H') return 0; |
531 | #endif |
c5e9c988 |
532 | strcpy(vstring, "SSH-"); |
533 | vsp = vstring+4; |
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534 | if (s_read(&c,1) != 1 || c != '-') return 0; |
535 | i = 0; |
536 | while (1) { |
537 | if (s_read(&c,1) != 1) |
538 | return 0; |
c5e9c988 |
539 | if (vsp < vstring+sizeof(vstring)-1) |
540 | *vsp++ = c; |
374330e2 |
541 | if (i >= 0) { |
542 | if (c == '-') { |
543 | version[i] = '\0'; |
544 | i = -1; |
545 | } else if (i < sizeof(version)-1) |
546 | version[i++] = c; |
547 | } |
548 | else if (c == '\n') |
549 | break; |
550 | } |
551 | |
c5e9c988 |
552 | *vsp = 0; |
553 | sprintf(vlog, "Server version: %s", vstring); |
554 | vlog[strcspn(vlog, "\r\n")] = '\0'; |
555 | logevent(vlog); |
556 | |
9697bfd2 |
557 | sprintf(vstring, "SSH-%s-PuTTY\n", |
558 | (ssh_versioncmp(version, "1.5") <= 0 ? version : "1.5")); |
c5e9c988 |
559 | sprintf(vlog, "We claim version: %s", vstring); |
560 | vlog[strcspn(vlog, "\r\n")] = '\0'; |
561 | logevent(vlog); |
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562 | s_write(vstring, strlen(vstring)); |
fef97f43 |
563 | return 1; |
374330e2 |
564 | } |
565 | |
fb09bf1c |
566 | /* |
567 | * Handle the key exchange and user authentication phases. |
568 | */ |
569 | static int do_ssh_login(unsigned char *in, int inlen, int ispkt) |
570 | { |
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571 | int i, j, len; |
572 | unsigned char session_id[16]; |
573 | unsigned char *rsabuf, *keystr1, *keystr2; |
574 | unsigned char cookie[8]; |
575 | struct RSAKey servkey, hostkey; |
576 | struct MD5Context md5c; |
ccbfb941 |
577 | static unsigned long supported_ciphers_mask, supported_auths_mask; |
bea1ef5f |
578 | int cipher_type; |
374330e2 |
579 | |
580 | extern struct ssh_cipher ssh_3des; |
9697bfd2 |
581 | extern struct ssh_cipher ssh_des; |
bea1ef5f |
582 | extern struct ssh_cipher ssh_blowfish; |
374330e2 |
583 | |
584 | crBegin; |
585 | |
fb09bf1c |
586 | if (!ispkt) crWaitUntil(ispkt); |
374330e2 |
587 | |
972a41c8 |
588 | if (pktin.type != SSH_SMSG_PUBLIC_KEY) |
374330e2 |
589 | fatalbox("Public key packet not received"); |
590 | |
c5e9c988 |
591 | logevent("Received public keys"); |
374330e2 |
592 | |
c5e9c988 |
593 | memcpy(cookie, pktin.body, 8); |
374330e2 |
594 | |
595 | i = makekey(pktin.body+8, &servkey, &keystr1); |
374330e2 |
596 | j = makekey(pktin.body+8+i, &hostkey, &keystr2); |
597 | |
c5e9c988 |
598 | /* |
599 | * Hash the host key and print the hash in the log box. Just as |
600 | * a last resort in case the registry's host key checking is |
601 | * compromised, we'll allow the user some ability to verify |
602 | * host keys by eye. |
603 | */ |
604 | MD5Init(&md5c); |
605 | MD5Update(&md5c, keystr2, hostkey.bytes); |
606 | MD5Final(session_id, &md5c); |
607 | { |
608 | char logmsg[80]; |
609 | int i; |
610 | logevent("Host key MD5 is:"); |
611 | strcpy(logmsg, " "); |
612 | for (i = 0; i < 16; i++) |
613 | sprintf(logmsg+strlen(logmsg), "%02x", session_id[i]); |
614 | logevent(logmsg); |
615 | } |
616 | |
fb09bf1c |
617 | supported_ciphers_mask = GET_32BIT(pktin.body+12+i+j); |
618 | supported_auths_mask = GET_32BIT(pktin.body+16+i+j); |
bea1ef5f |
619 | |
c5e9c988 |
620 | MD5Init(&md5c); |
374330e2 |
621 | MD5Update(&md5c, keystr2, hostkey.bytes); |
622 | MD5Update(&md5c, keystr1, servkey.bytes); |
623 | MD5Update(&md5c, pktin.body, 8); |
374330e2 |
624 | MD5Final(session_id, &md5c); |
625 | |
626 | for (i=0; i<32; i++) |
627 | session_key[i] = random_byte(); |
628 | |
629 | len = (hostkey.bytes > servkey.bytes ? hostkey.bytes : servkey.bytes); |
630 | |
631 | rsabuf = malloc(len); |
632 | if (!rsabuf) |
633 | fatalbox("Out of memory"); |
634 | |
89ee5268 |
635 | /* |
636 | * Verify the host key. |
637 | */ |
638 | { |
639 | /* |
640 | * First format the key into a string. |
641 | */ |
642 | int len = rsastr_len(&hostkey); |
643 | char *keystr = malloc(len); |
644 | if (!keystr) |
645 | fatalbox("Out of memory"); |
646 | rsastr_fmt(keystr, &hostkey); |
647 | verify_ssh_host_key(savedhost, keystr); |
648 | free(keystr); |
649 | } |
374330e2 |
650 | |
651 | for (i=0; i<32; i++) { |
652 | rsabuf[i] = session_key[i]; |
653 | if (i < 16) |
654 | rsabuf[i] ^= session_id[i]; |
655 | } |
656 | |
657 | if (hostkey.bytes > servkey.bytes) { |
658 | rsaencrypt(rsabuf, 32, &servkey); |
659 | rsaencrypt(rsabuf, servkey.bytes, &hostkey); |
660 | } else { |
661 | rsaencrypt(rsabuf, 32, &hostkey); |
662 | rsaencrypt(rsabuf, hostkey.bytes, &servkey); |
663 | } |
664 | |
c5e9c988 |
665 | logevent("Encrypted session key"); |
666 | |
bea1ef5f |
667 | cipher_type = cfg.cipher == CIPHER_BLOWFISH ? SSH_CIPHER_BLOWFISH : |
9697bfd2 |
668 | cfg.cipher == CIPHER_DES ? SSH_CIPHER_DES : |
bea1ef5f |
669 | SSH_CIPHER_3DES; |
670 | if ((supported_ciphers_mask & (1 << cipher_type)) == 0) { |
671 | c_write("Selected cipher not supported, falling back to 3DES\r\n", 53); |
672 | cipher_type = SSH_CIPHER_3DES; |
673 | } |
c5e9c988 |
674 | switch (cipher_type) { |
675 | case SSH_CIPHER_3DES: logevent("Using 3DES encryption"); break; |
676 | case SSH_CIPHER_DES: logevent("Using single-DES encryption"); break; |
677 | case SSH_CIPHER_BLOWFISH: logevent("Using Blowfish encryption"); break; |
678 | } |
bea1ef5f |
679 | |
fb09bf1c |
680 | send_packet(SSH_CMSG_SESSION_KEY, |
681 | PKT_CHAR, cipher_type, |
682 | PKT_DATA, cookie, 8, |
683 | PKT_CHAR, (len*8) >> 8, PKT_CHAR, (len*8) & 0xFF, |
684 | PKT_DATA, rsabuf, len, |
685 | PKT_INT, 0, |
686 | PKT_END); |
687 | |
c5e9c988 |
688 | logevent("Trying to enable encryption..."); |
374330e2 |
689 | |
690 | free(rsabuf); |
691 | |
bea1ef5f |
692 | cipher = cipher_type == SSH_CIPHER_BLOWFISH ? &ssh_blowfish : |
9697bfd2 |
693 | cipher_type == SSH_CIPHER_DES ? &ssh_des : |
bea1ef5f |
694 | &ssh_3des; |
374330e2 |
695 | cipher->sesskey(session_key); |
696 | |
fb09bf1c |
697 | crWaitUntil(ispkt); |
374330e2 |
698 | |
972a41c8 |
699 | if (pktin.type != SSH_SMSG_SUCCESS) |
374330e2 |
700 | fatalbox("Encryption not successfully enabled"); |
701 | |
c5e9c988 |
702 | logevent("Successfully started encryption"); |
703 | |
374330e2 |
704 | fflush(stdout); |
705 | { |
706 | static char username[100]; |
707 | static int pos = 0; |
708 | static char c; |
fb09bf1c |
709 | if (!IS_SCP && !*cfg.username) { |
374330e2 |
710 | c_write("login as: ", 10); |
711 | while (pos >= 0) { |
fb09bf1c |
712 | crWaitUntil(!ispkt); |
374330e2 |
713 | while (inlen--) switch (c = *in++) { |
714 | case 10: case 13: |
715 | username[pos] = 0; |
716 | pos = -1; |
717 | break; |
718 | case 8: case 127: |
719 | if (pos > 0) { |
720 | c_write("\b \b", 3); |
721 | pos--; |
722 | } |
723 | break; |
724 | case 21: case 27: |
725 | while (pos > 0) { |
726 | c_write("\b \b", 3); |
727 | pos--; |
728 | } |
729 | break; |
730 | case 3: case 4: |
731 | random_save_seed(); |
732 | exit(0); |
733 | break; |
734 | default: |
40d24aa6 |
735 | if (((c >= ' ' && c <= '~') || |
736 | ((unsigned char)c >= 160)) && pos < 40) { |
374330e2 |
737 | username[pos++] = c; |
738 | c_write(&c, 1); |
739 | } |
740 | break; |
741 | } |
742 | } |
743 | c_write("\r\n", 2); |
744 | username[strcspn(username, "\n\r")] = '\0'; |
745 | } else { |
746 | char stuff[200]; |
747 | strncpy(username, cfg.username, 99); |
748 | username[99] = '\0'; |
fb09bf1c |
749 | if (!IS_SCP) { |
750 | sprintf(stuff, "Sent username \"%s\".\r\n", username); |
751 | c_write(stuff, strlen(stuff)); |
752 | } |
374330e2 |
753 | } |
fb09bf1c |
754 | |
755 | send_packet(SSH_CMSG_USER, PKT_STR, username, PKT_END); |
c5e9c988 |
756 | { |
757 | char userlog[20+sizeof(username)]; |
758 | sprintf(userlog, "Sent username \"%s\"", username); |
759 | logevent(userlog); |
760 | } |
374330e2 |
761 | } |
762 | |
fb09bf1c |
763 | crWaitUntil(ispkt); |
374330e2 |
764 | |
972a41c8 |
765 | while (pktin.type == SSH_SMSG_FAILURE) { |
374330e2 |
766 | static char password[100]; |
767 | static int pos; |
768 | static char c; |
ccbfb941 |
769 | static int pwpkt_type; |
770 | |
771 | /* |
772 | * Show password prompt, having first obtained it via a TIS |
773 | * exchange if we're doing TIS authentication. |
774 | */ |
775 | pwpkt_type = SSH_CMSG_AUTH_PASSWORD; |
fb09bf1c |
776 | |
777 | if (IS_SCP) { |
778 | char prompt[200]; |
779 | sprintf(prompt, "%s@%s's password: ", cfg.username, savedhost); |
85ee8208 |
780 | if (!ssh_get_password(prompt, password, sizeof(password))) { |
781 | /* |
782 | * get_password failed to get a password (for |
783 | * example because one was supplied on the command |
784 | * line which has already failed to work). |
785 | * Terminate. |
786 | */ |
787 | logevent("No more passwords to try"); |
788 | ssh_state = SSH_STATE_CLOSED; |
789 | crReturn(1); |
790 | } |
fb09bf1c |
791 | } else { |
792 | |
ccbfb941 |
793 | if (pktin.type == SSH_SMSG_FAILURE && |
794 | cfg.try_tis_auth && |
795 | (supported_auths_mask & (1<<SSH_AUTH_TIS))) { |
796 | pwpkt_type = SSH_CMSG_AUTH_TIS_RESPONSE; |
c5e9c988 |
797 | logevent("Requested TIS authentication"); |
fb09bf1c |
798 | send_packet(SSH_CMSG_AUTH_TIS, PKT_END); |
799 | crWaitUntil(ispkt); |
ccbfb941 |
800 | if (pktin.type != SSH_SMSG_AUTH_TIS_CHALLENGE) { |
c5e9c988 |
801 | logevent("TIS authentication declined"); |
ccbfb941 |
802 | c_write("TIS authentication refused.\r\n", 29); |
803 | } else { |
804 | int challengelen = ((pktin.body[0] << 24) | |
805 | (pktin.body[1] << 16) | |
806 | (pktin.body[2] << 8) | |
807 | (pktin.body[3])); |
c5e9c988 |
808 | logevent("Received TIS challenge"); |
ccbfb941 |
809 | c_write(pktin.body+4, challengelen); |
810 | } |
811 | } |
812 | if (pwpkt_type == SSH_CMSG_AUTH_PASSWORD) |
813 | c_write("password: ", 10); |
814 | |
374330e2 |
815 | pos = 0; |
816 | while (pos >= 0) { |
fb09bf1c |
817 | crWaitUntil(!ispkt); |
374330e2 |
818 | while (inlen--) switch (c = *in++) { |
819 | case 10: case 13: |
820 | password[pos] = 0; |
821 | pos = -1; |
822 | break; |
823 | case 8: case 127: |
824 | if (pos > 0) |
825 | pos--; |
826 | break; |
827 | case 21: case 27: |
828 | pos = 0; |
829 | break; |
830 | case 3: case 4: |
831 | random_save_seed(); |
832 | exit(0); |
833 | break; |
834 | default: |
40d24aa6 |
835 | if (((c >= ' ' && c <= '~') || |
836 | ((unsigned char)c >= 160)) && pos < 40) |
374330e2 |
837 | password[pos++] = c; |
838 | break; |
839 | } |
840 | } |
841 | c_write("\r\n", 2); |
fb09bf1c |
842 | |
843 | } |
844 | |
845 | send_packet(pwpkt_type, PKT_STR, password, PKT_END); |
c5e9c988 |
846 | logevent("Sent password"); |
374330e2 |
847 | memset(password, 0, strlen(password)); |
fb09bf1c |
848 | crWaitUntil(ispkt); |
849 | if (pktin.type == SSH_SMSG_FAILURE) { |
374330e2 |
850 | c_write("Access denied\r\n", 15); |
c5e9c988 |
851 | logevent("Authentication refused"); |
fb09bf1c |
852 | } else if (pktin.type == SSH_MSG_DISCONNECT) { |
853 | logevent("Received disconnect request"); |
85ee8208 |
854 | ssh_state = SSH_STATE_CLOSED; |
855 | crReturn(1); |
fb09bf1c |
856 | } else if (pktin.type != SSH_SMSG_SUCCESS) { |
374330e2 |
857 | fatalbox("Strange packet received, type %d", pktin.type); |
858 | } |
859 | } |
860 | |
c5e9c988 |
861 | logevent("Authentication successful"); |
862 | |
fb09bf1c |
863 | crFinish(1); |
864 | } |
865 | |
866 | static void ssh_protocol(unsigned char *in, int inlen, int ispkt) { |
867 | crBegin; |
868 | |
869 | random_init(); |
870 | |
85ee8208 |
871 | while (!do_ssh_login(in, inlen, ispkt)) { |
fb09bf1c |
872 | crReturnV; |
85ee8208 |
873 | } |
874 | if (ssh_state == SSH_STATE_CLOSED) |
875 | crReturnV; |
fb09bf1c |
876 | |
fef97f43 |
877 | if (!cfg.nopty) { |
fb09bf1c |
878 | send_packet(SSH_CMSG_REQUEST_PTY, |
879 | PKT_STR, cfg.termtype, |
880 | PKT_INT, rows, PKT_INT, cols, |
881 | PKT_INT, 0, PKT_INT, 0, |
882 | PKT_CHAR, 0, |
883 | PKT_END); |
fef97f43 |
884 | ssh_state = SSH_STATE_INTERMED; |
885 | do { crReturnV; } while (!ispkt); |
ccbfb941 |
886 | if (pktin.type != SSH_SMSG_SUCCESS && pktin.type != SSH_SMSG_FAILURE) { |
fef97f43 |
887 | fatalbox("Protocol confusion"); |
ccbfb941 |
888 | } else if (pktin.type == SSH_SMSG_FAILURE) { |
fef97f43 |
889 | c_write("Server refused to allocate pty\r\n", 32); |
890 | } |
c5e9c988 |
891 | logevent("Allocated pty"); |
374330e2 |
892 | } |
893 | |
fb09bf1c |
894 | send_packet(SSH_CMSG_EXEC_SHELL, PKT_END); |
c5e9c988 |
895 | logevent("Started session"); |
374330e2 |
896 | |
897 | ssh_state = SSH_STATE_SESSION; |
898 | if (size_needed) |
899 | ssh_size(); |
900 | |
901 | while (1) { |
902 | crReturnV; |
903 | if (ispkt) { |
972a41c8 |
904 | if (pktin.type == SSH_SMSG_STDOUT_DATA || |
905 | pktin.type == SSH_SMSG_STDERR_DATA) { |
fb09bf1c |
906 | long len = GET_32BIT(pktin.body); |
907 | c_write(pktin.body+4, len); |
972a41c8 |
908 | } else if (pktin.type == SSH_MSG_DISCONNECT) { |
21248260 |
909 | ssh_state = SSH_STATE_CLOSED; |
c5e9c988 |
910 | logevent("Received disconnect request"); |
ccbfb941 |
911 | } else if (pktin.type == SSH_SMSG_SUCCESS) { |
972a41c8 |
912 | /* may be from EXEC_SHELL on some servers */ |
ccbfb941 |
913 | } else if (pktin.type == SSH_SMSG_FAILURE) { |
972a41c8 |
914 | /* may be from EXEC_SHELL on some servers |
374330e2 |
915 | * if no pty is available or in other odd cases. Ignore */ |
fb09bf1c |
916 | } else if (pktin.type == SSH_SMSG_EXIT_STATUS) { |
917 | send_packet(SSH_CMSG_EXIT_CONFIRMATION, PKT_END); |
374330e2 |
918 | } else { |
919 | fatalbox("Strange packet received: type %d", pktin.type); |
920 | } |
921 | } else { |
fb09bf1c |
922 | send_packet(SSH_CMSG_STDIN_DATA, |
923 | PKT_INT, inlen, PKT_DATA, in, inlen, PKT_END); |
374330e2 |
924 | } |
925 | } |
926 | |
927 | crFinishV; |
928 | } |
929 | |
930 | /* |
931 | * Called to set up the connection. Will arrange for WM_NETEVENT |
932 | * messages to be passed to the specified window, whose window |
933 | * procedure should then call telnet_msg(). |
934 | * |
935 | * Returns an error message, or NULL on success. |
374330e2 |
936 | */ |
937 | static char *ssh_init (HWND hwnd, char *host, int port, char **realhost) { |
fb09bf1c |
938 | char *p; |
8f203108 |
939 | |
940 | #ifdef MSCRYPTOAPI |
941 | if(crypto_startup() == 0) |
942 | return "Microsoft high encryption pack not installed!"; |
943 | #endif |
374330e2 |
944 | |
fb09bf1c |
945 | p = connect_to_host(host, port, realhost); |
946 | if (p != NULL) |
947 | return p; |
374330e2 |
948 | |
949 | if (!do_ssh_init()) |
950 | return "Protocol initialisation error"; |
951 | |
952 | if (WSAAsyncSelect (s, hwnd, WM_NETEVENT, FD_READ | FD_CLOSE) == SOCKET_ERROR) |
953 | switch (WSAGetLastError()) { |
954 | case WSAENETDOWN: return "Network is down"; |
955 | default: return "WSAAsyncSelect(): unknown error"; |
956 | } |
957 | |
958 | return NULL; |
959 | } |
960 | |
961 | /* |
962 | * Process a WM_NETEVENT message. Will return 0 if the connection |
963 | * has closed, or <0 for a socket error. |
964 | */ |
965 | static int ssh_msg (WPARAM wParam, LPARAM lParam) { |
966 | int ret; |
967 | char buf[256]; |
968 | |
8ce72d2c |
969 | /* |
970 | * Because reading less than the whole of the available pending |
971 | * data can generate an FD_READ event, we need to allow for the |
972 | * possibility that FD_READ may arrive with FD_CLOSE already in |
973 | * the queue; so it's possible that we can get here even with s |
974 | * invalid. If so, we return 1 and don't worry about it. |
975 | */ |
976 | if (s == INVALID_SOCKET) |
977 | return 1; |
374330e2 |
978 | |
979 | if (WSAGETSELECTERROR(lParam) != 0) |
980 | return -WSAGETSELECTERROR(lParam); |
981 | |
982 | switch (WSAGETSELECTEVENT(lParam)) { |
983 | case FD_READ: |
8ce72d2c |
984 | case FD_CLOSE: |
374330e2 |
985 | ret = recv(s, buf, sizeof(buf), 0); |
986 | if (ret < 0 && WSAGetLastError() == WSAEWOULDBLOCK) |
987 | return 1; |
988 | if (ret < 0) /* any _other_ error */ |
989 | return -10000-WSAGetLastError(); |
990 | if (ret == 0) { |
991 | s = INVALID_SOCKET; |
8ce72d2c |
992 | return 0; |
374330e2 |
993 | } |
994 | ssh_gotdata (buf, ret); |
85ee8208 |
995 | if (ssh_state == SSH_STATE_CLOSED) { |
996 | closesocket(s); |
997 | s = INVALID_SOCKET; |
998 | return 0; |
999 | } |
374330e2 |
1000 | return 1; |
374330e2 |
1001 | } |
1002 | return 1; /* shouldn't happen, but WTF */ |
1003 | } |
1004 | |
1005 | /* |
1006 | * Called to send data down the Telnet connection. |
1007 | */ |
1008 | static void ssh_send (char *buf, int len) { |
1009 | if (s == INVALID_SOCKET) |
1010 | return; |
1011 | |
1012 | ssh_protocol(buf, len, 0); |
1013 | } |
1014 | |
1015 | /* |
1016 | * Called to set the size of the window from Telnet's POV. |
1017 | */ |
1018 | static void ssh_size(void) { |
1019 | switch (ssh_state) { |
1020 | case SSH_STATE_BEFORE_SIZE: |
21248260 |
1021 | case SSH_STATE_CLOSED: |
374330e2 |
1022 | break; /* do nothing */ |
1023 | case SSH_STATE_INTERMED: |
1024 | size_needed = TRUE; /* buffer for later */ |
1025 | break; |
1026 | case SSH_STATE_SESSION: |
fef97f43 |
1027 | if (!cfg.nopty) { |
fb09bf1c |
1028 | send_packet(SSH_CMSG_WINDOW_SIZE, |
1029 | PKT_INT, rows, PKT_INT, cols, |
1030 | PKT_INT, 0, PKT_INT, 0, PKT_END); |
fef97f43 |
1031 | } |
374330e2 |
1032 | } |
1033 | } |
1034 | |
1035 | /* |
1036 | * (Send Telnet special codes) |
1037 | */ |
1038 | static void ssh_special (Telnet_Special code) { |
1039 | /* do nothing */ |
1040 | } |
1041 | |
fb09bf1c |
1042 | |
1043 | /* |
1044 | * Read and decrypt one incoming SSH packet. |
1045 | * (only used by pSCP) |
1046 | */ |
1047 | static void get_packet(void) |
1048 | { |
1049 | unsigned char buf[4096], *p; |
1050 | long to_read; |
1051 | int len; |
1052 | |
1053 | assert(IS_SCP); |
1054 | |
1055 | p = NULL; |
1056 | len = 0; |
1057 | |
1058 | while ((to_read = s_rdpkt(&p, &len)) > 0) { |
1059 | if (to_read > sizeof(buf)) to_read = sizeof(buf); |
1060 | len = s_read(buf, to_read); |
1061 | if (len != to_read) { |
1062 | closesocket(s); |
1063 | s = INVALID_SOCKET; |
1064 | return; |
1065 | } |
1066 | p = buf; |
1067 | } |
1068 | |
1069 | assert(len == 0); |
1070 | } |
1071 | |
1072 | /* |
1073 | * Receive a block of data over the SSH link. Block until |
1074 | * all data is available. Return nr of bytes read (0 if lost connection). |
1075 | * (only used by pSCP) |
1076 | */ |
1077 | int ssh_scp_recv(unsigned char *buf, int len) |
1078 | { |
1079 | static int pending_input_len = 0; |
1080 | static unsigned char *pending_input_ptr; |
1081 | int to_read = len; |
1082 | |
1083 | assert(IS_SCP); |
1084 | |
1085 | if (pending_input_len >= to_read) { |
1086 | memcpy(buf, pending_input_ptr, to_read); |
1087 | pending_input_ptr += to_read; |
1088 | pending_input_len -= to_read; |
1089 | return len; |
1090 | } |
1091 | |
1092 | if (pending_input_len > 0) { |
1093 | memcpy(buf, pending_input_ptr, pending_input_len); |
1094 | buf += pending_input_len; |
1095 | to_read -= pending_input_len; |
1096 | pending_input_len = 0; |
1097 | } |
1098 | |
1099 | if (s == INVALID_SOCKET) |
1100 | return 0; |
1101 | while (to_read > 0) { |
1102 | get_packet(); |
1103 | if (s == INVALID_SOCKET) |
1104 | return 0; |
1105 | if (pktin.type == SSH_SMSG_STDOUT_DATA) { |
1106 | int plen = GET_32BIT(pktin.body); |
1107 | if (plen <= to_read) { |
1108 | memcpy(buf, pktin.body + 4, plen); |
1109 | buf += plen; |
1110 | to_read -= plen; |
1111 | } else { |
1112 | memcpy(buf, pktin.body + 4, to_read); |
1113 | pending_input_len = plen - to_read; |
1114 | pending_input_ptr = pktin.body + 4 + to_read; |
1115 | to_read = 0; |
1116 | } |
1117 | } else if (pktin.type == SSH_SMSG_STDERR_DATA) { |
1118 | int plen = GET_32BIT(pktin.body); |
1119 | fwrite(pktin.body + 4, plen, 1, stderr); |
1120 | } else if (pktin.type == SSH_MSG_DISCONNECT) { |
1121 | logevent("Received disconnect request"); |
1122 | } else if (pktin.type == SSH_SMSG_SUCCESS || |
1123 | pktin.type == SSH_SMSG_FAILURE) { |
1124 | /* ignore */ |
1125 | } else if (pktin.type == SSH_SMSG_EXIT_STATUS) { |
1126 | char logbuf[100]; |
1127 | sprintf(logbuf, "Remote exit status: %d", GET_32BIT(pktin.body)); |
1128 | logevent(logbuf); |
1129 | send_packet(SSH_CMSG_EXIT_CONFIRMATION, PKT_END); |
1130 | logevent("Closing connection"); |
1131 | closesocket(s); |
1132 | s = INVALID_SOCKET; |
1133 | } else { |
1134 | fatalbox("Strange packet received: type %d", pktin.type); |
1135 | } |
1136 | } |
1137 | |
1138 | return len; |
1139 | } |
1140 | |
1141 | /* |
1142 | * Send a block of data over the SSH link. |
1143 | * Block until all data is sent. |
1144 | * (only used by pSCP) |
1145 | */ |
1146 | void ssh_scp_send(unsigned char *buf, int len) |
1147 | { |
1148 | assert(IS_SCP); |
1149 | if (s == INVALID_SOCKET) |
1150 | return; |
1151 | send_packet(SSH_CMSG_STDIN_DATA, |
1152 | PKT_INT, len, PKT_DATA, buf, len, PKT_END); |
1153 | } |
1154 | |
1155 | /* |
1156 | * Send an EOF notification to the server. |
1157 | * (only used by pSCP) |
1158 | */ |
1159 | void ssh_scp_send_eof(void) |
1160 | { |
1161 | assert(IS_SCP); |
1162 | if (s == INVALID_SOCKET) |
1163 | return; |
1164 | send_packet(SSH_CMSG_EOF, PKT_END); |
1165 | } |
1166 | |
1167 | /* |
1168 | * Set up the connection, login on the remote host and |
1169 | * start execution of a command. |
1170 | * Returns an error message, or NULL on success. |
1171 | * (only used by pSCP) |
1172 | */ |
1173 | char *ssh_scp_init(char *host, int port, char *cmd, char **realhost) |
1174 | { |
1175 | char buf[160], *p; |
1176 | |
1177 | assert(IS_SCP); |
1178 | |
1179 | #ifdef MSCRYPTOAPI |
1180 | if (crypto_startup() == 0) |
1181 | return "Microsoft high encryption pack not installed!"; |
1182 | #endif |
1183 | |
1184 | p = connect_to_host(host, port, realhost); |
1185 | if (p != NULL) |
1186 | return p; |
1187 | |
1188 | random_init(); |
1189 | |
1190 | if (!do_ssh_init()) |
1191 | return "Protocol initialisation error"; |
1192 | |
1193 | /* Exchange keys and login */ |
1194 | do { |
1195 | get_packet(); |
1196 | if (s == INVALID_SOCKET) |
1197 | return "Connection closed by remote host"; |
85ee8208 |
1198 | } while (!do_ssh_login(NULL, 0, 1)); |
1199 | |
1200 | if (ssh_state == SSH_STATE_CLOSED) { |
1201 | closesocket(s); |
1202 | s = INVALID_SOCKET; |
1203 | return "Session initialisation error"; |
1204 | } |
fb09bf1c |
1205 | |
1206 | /* Execute command */ |
1207 | sprintf(buf, "Sending command: %.100s", cmd); |
1208 | logevent(buf); |
1209 | send_packet(SSH_CMSG_EXEC_CMD, PKT_STR, cmd, PKT_END); |
1210 | |
1211 | return NULL; |
1212 | } |
1213 | |
1214 | |
374330e2 |
1215 | Backend ssh_backend = { |
1216 | ssh_init, |
1217 | ssh_msg, |
1218 | ssh_send, |
1219 | ssh_size, |
1220 | ssh_special |
1221 | }; |
fb09bf1c |
1222 | |