| 1 | #include <stdio.h> |
| 2 | #include <stdlib.h> |
| 3 | #include <stdarg.h> |
| 4 | #include <assert.h> |
| 5 | #include <winsock.h> |
| 6 | |
| 7 | #include "putty.h" |
| 8 | #include "ssh.h" |
| 9 | #include "scp.h" |
| 10 | |
| 11 | #ifndef FALSE |
| 12 | #define FALSE 0 |
| 13 | #endif |
| 14 | #ifndef TRUE |
| 15 | #define TRUE 1 |
| 16 | #endif |
| 17 | |
| 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 }; |
| 60 | |
| 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) |
| 77 | #define crWaitUntil(c) do { crReturn(0); } while (!(c)) |
| 78 | |
| 79 | static SOCKET s = INVALID_SOCKET; |
| 80 | |
| 81 | static unsigned char session_key[32]; |
| 82 | static struct ssh_cipher *cipher = NULL; |
| 83 | int scp_flags = 0; |
| 84 | int (*ssh_get_password)(const char *prompt, char *str, int maxlen) = NULL; |
| 85 | |
| 86 | static char *savedhost; |
| 87 | |
| 88 | static enum { |
| 89 | SSH_STATE_BEFORE_SIZE, |
| 90 | SSH_STATE_INTERMED, |
| 91 | SSH_STATE_SESSION, |
| 92 | SSH_STATE_CLOSED |
| 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); |
| 100 | if (IS_SCP) { |
| 101 | noise_ultralight(i); |
| 102 | if (i <= 0) |
| 103 | fatalbox("Lost connection while sending"); |
| 104 | } |
| 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); |
| 114 | if (IS_SCP) |
| 115 | noise_ultralight(i); |
| 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) { |
| 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 | } |
| 131 | while (len--) |
| 132 | c_write1(*buf++); |
| 133 | } |
| 134 | |
| 135 | struct Packet { |
| 136 | long length; |
| 137 | int type; |
| 138 | unsigned char *data; |
| 139 | unsigned char *body; |
| 140 | long maxlen; |
| 141 | }; |
| 142 | |
| 143 | static struct Packet pktin = { 0, 0, NULL, NULL, 0 }; |
| 144 | static struct Packet pktout = { 0, 0, NULL, NULL, 0 }; |
| 145 | |
| 146 | static void ssh_protocol(unsigned char *in, int inlen, int ispkt); |
| 147 | static void ssh_size(void); |
| 148 | |
| 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; |
| 161 | static unsigned long realcrc, gotcrc; |
| 162 | static unsigned char *p; |
| 163 | static int i; |
| 164 | |
| 165 | crBegin; |
| 166 | |
| 167 | next_packet: |
| 168 | |
| 169 | pktin.type = 0; |
| 170 | pktin.length = 0; |
| 171 | |
| 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 | } |
| 178 | |
| 179 | #ifdef FWHACK |
| 180 | if (len == 0x52656d6f) { /* "Remo"te server has closed ... */ |
| 181 | len = 0x300; /* big enough to carry to end */ |
| 182 | } |
| 183 | #endif |
| 184 | |
| 185 | pad = 8 - (len % 8); |
| 186 | biglen = len + pad; |
| 187 | pktin.length = len - 5; |
| 188 | |
| 189 | if (pktin.maxlen < biglen) { |
| 190 | pktin.maxlen = biglen; |
| 191 | #ifdef MSCRYPTOAPI |
| 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)); |
| 196 | #else |
| 197 | pktin.data = (pktin.data == NULL ? malloc(biglen) : |
| 198 | realloc(pktin.data, biglen)); |
| 199 | #endif |
| 200 | if (!pktin.data) |
| 201 | fatalbox("Out of memory"); |
| 202 | } |
| 203 | |
| 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 | } |
| 219 | |
| 220 | if (cipher) |
| 221 | cipher->decrypt(pktin.data, biglen); |
| 222 | |
| 223 | pktin.type = pktin.data[pad]; |
| 224 | pktin.body = pktin.data + pad + 1; |
| 225 | |
| 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 | } |
| 231 | |
| 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) { |
| 262 | if ( s_rdpkt(&data, &datalen) == 0 ) { |
| 263 | ssh_protocol(NULL, 0, 1); |
| 264 | if (ssh_state == SSH_STATE_CLOSED) { |
| 265 | return; |
| 266 | } |
| 267 | } |
| 268 | } |
| 269 | } |
| 270 | |
| 271 | |
| 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; |
| 282 | #ifdef MSCRYPTOAPI |
| 283 | /* Allocate enough buffer space for extra block |
| 284 | * for MS CryptEncrypt() */ |
| 285 | pktout.data = (pktout.data == NULL ? malloc(biglen+12) : |
| 286 | realloc(pktout.data, biglen+12)); |
| 287 | #else |
| 288 | pktout.data = (pktout.data == NULL ? malloc(biglen+4) : |
| 289 | realloc(pktout.data, biglen+4)); |
| 290 | #endif |
| 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); |
| 311 | PUT_32BIT(pktout.data+biglen, crc); |
| 312 | PUT_32BIT(pktout.data, len); |
| 313 | |
| 314 | if (cipher) |
| 315 | cipher->encrypt(pktout.data+4, biglen); |
| 316 | |
| 317 | s_write(pktout.data, biglen+4); |
| 318 | } |
| 319 | |
| 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 | |
| 497 | static int ssh_versioncmp(char *a, char *b) { |
| 498 | char *ae, *be; |
| 499 | unsigned long av, bv; |
| 500 | |
| 501 | av = strtoul(a, &ae, 10); |
| 502 | bv = strtoul(b, &be, 10); |
| 503 | if (av != bv) return (av < bv ? -1 : +1); |
| 504 | if (*ae == '.') ae++; |
| 505 | if (*be == '.') be++; |
| 506 | av = strtoul(ae, &ae, 10); |
| 507 | bv = strtoul(be, &be, 10); |
| 508 | if (av != bv) return (av < bv ? -1 : +1); |
| 509 | return 0; |
| 510 | } |
| 511 | |
| 512 | static int do_ssh_init(void) { |
| 513 | char c, *vsp; |
| 514 | char version[10]; |
| 515 | char vstring[80]; |
| 516 | char vlog[sizeof(vstring)+20]; |
| 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 |
| 532 | strcpy(vstring, "SSH-"); |
| 533 | vsp = vstring+4; |
| 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; |
| 539 | if (vsp < vstring+sizeof(vstring)-1) |
| 540 | *vsp++ = c; |
| 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 | |
| 552 | *vsp = 0; |
| 553 | sprintf(vlog, "Server version: %s", vstring); |
| 554 | vlog[strcspn(vlog, "\r\n")] = '\0'; |
| 555 | logevent(vlog); |
| 556 | |
| 557 | sprintf(vstring, "SSH-%s-PuTTY\n", |
| 558 | (ssh_versioncmp(version, "1.5") <= 0 ? version : "1.5")); |
| 559 | sprintf(vlog, "We claim version: %s", vstring); |
| 560 | vlog[strcspn(vlog, "\r\n")] = '\0'; |
| 561 | logevent(vlog); |
| 562 | s_write(vstring, strlen(vstring)); |
| 563 | return 1; |
| 564 | } |
| 565 | |
| 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 | { |
| 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; |
| 577 | static unsigned long supported_ciphers_mask, supported_auths_mask; |
| 578 | int cipher_type; |
| 579 | |
| 580 | extern struct ssh_cipher ssh_3des; |
| 581 | extern struct ssh_cipher ssh_des; |
| 582 | extern struct ssh_cipher ssh_blowfish; |
| 583 | |
| 584 | crBegin; |
| 585 | |
| 586 | if (!ispkt) crWaitUntil(ispkt); |
| 587 | |
| 588 | if (pktin.type != SSH_SMSG_PUBLIC_KEY) |
| 589 | fatalbox("Public key packet not received"); |
| 590 | |
| 591 | logevent("Received public keys"); |
| 592 | |
| 593 | memcpy(cookie, pktin.body, 8); |
| 594 | |
| 595 | i = makekey(pktin.body+8, &servkey, &keystr1); |
| 596 | j = makekey(pktin.body+8+i, &hostkey, &keystr2); |
| 597 | |
| 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 | |
| 617 | supported_ciphers_mask = GET_32BIT(pktin.body+12+i+j); |
| 618 | supported_auths_mask = GET_32BIT(pktin.body+16+i+j); |
| 619 | |
| 620 | MD5Init(&md5c); |
| 621 | MD5Update(&md5c, keystr2, hostkey.bytes); |
| 622 | MD5Update(&md5c, keystr1, servkey.bytes); |
| 623 | MD5Update(&md5c, pktin.body, 8); |
| 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 | |
| 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 | } |
| 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 | |
| 665 | logevent("Encrypted session key"); |
| 666 | |
| 667 | cipher_type = cfg.cipher == CIPHER_BLOWFISH ? SSH_CIPHER_BLOWFISH : |
| 668 | cfg.cipher == CIPHER_DES ? SSH_CIPHER_DES : |
| 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 | } |
| 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 | } |
| 679 | |
| 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 | |
| 688 | logevent("Trying to enable encryption..."); |
| 689 | |
| 690 | free(rsabuf); |
| 691 | |
| 692 | cipher = cipher_type == SSH_CIPHER_BLOWFISH ? &ssh_blowfish : |
| 693 | cipher_type == SSH_CIPHER_DES ? &ssh_des : |
| 694 | &ssh_3des; |
| 695 | cipher->sesskey(session_key); |
| 696 | |
| 697 | crWaitUntil(ispkt); |
| 698 | |
| 699 | if (pktin.type != SSH_SMSG_SUCCESS) |
| 700 | fatalbox("Encryption not successfully enabled"); |
| 701 | |
| 702 | logevent("Successfully started encryption"); |
| 703 | |
| 704 | fflush(stdout); |
| 705 | { |
| 706 | static char username[100]; |
| 707 | static int pos = 0; |
| 708 | static char c; |
| 709 | if (!IS_SCP && !*cfg.username) { |
| 710 | c_write("login as: ", 10); |
| 711 | while (pos >= 0) { |
| 712 | crWaitUntil(!ispkt); |
| 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: |
| 735 | if (((c >= ' ' && c <= '~') || |
| 736 | ((unsigned char)c >= 160)) && pos < 40) { |
| 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'; |
| 749 | if (!IS_SCP) { |
| 750 | sprintf(stuff, "Sent username \"%s\".\r\n", username); |
| 751 | c_write(stuff, strlen(stuff)); |
| 752 | } |
| 753 | } |
| 754 | |
| 755 | send_packet(SSH_CMSG_USER, PKT_STR, username, PKT_END); |
| 756 | { |
| 757 | char userlog[20+sizeof(username)]; |
| 758 | sprintf(userlog, "Sent username \"%s\"", username); |
| 759 | logevent(userlog); |
| 760 | } |
| 761 | } |
| 762 | |
| 763 | crWaitUntil(ispkt); |
| 764 | |
| 765 | while (pktin.type == SSH_SMSG_FAILURE) { |
| 766 | static char password[100]; |
| 767 | static int pos; |
| 768 | static char c; |
| 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; |
| 776 | |
| 777 | if (IS_SCP) { |
| 778 | char prompt[200]; |
| 779 | sprintf(prompt, "%s@%s's password: ", cfg.username, savedhost); |
| 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 | } |
| 791 | } else { |
| 792 | |
| 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; |
| 797 | logevent("Requested TIS authentication"); |
| 798 | send_packet(SSH_CMSG_AUTH_TIS, PKT_END); |
| 799 | crWaitUntil(ispkt); |
| 800 | if (pktin.type != SSH_SMSG_AUTH_TIS_CHALLENGE) { |
| 801 | logevent("TIS authentication declined"); |
| 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])); |
| 808 | logevent("Received TIS challenge"); |
| 809 | c_write(pktin.body+4, challengelen); |
| 810 | } |
| 811 | } |
| 812 | if (pwpkt_type == SSH_CMSG_AUTH_PASSWORD) |
| 813 | c_write("password: ", 10); |
| 814 | |
| 815 | pos = 0; |
| 816 | while (pos >= 0) { |
| 817 | crWaitUntil(!ispkt); |
| 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: |
| 835 | if (((c >= ' ' && c <= '~') || |
| 836 | ((unsigned char)c >= 160)) && pos < 40) |
| 837 | password[pos++] = c; |
| 838 | break; |
| 839 | } |
| 840 | } |
| 841 | c_write("\r\n", 2); |
| 842 | |
| 843 | } |
| 844 | |
| 845 | send_packet(pwpkt_type, PKT_STR, password, PKT_END); |
| 846 | logevent("Sent password"); |
| 847 | memset(password, 0, strlen(password)); |
| 848 | crWaitUntil(ispkt); |
| 849 | if (pktin.type == SSH_SMSG_FAILURE) { |
| 850 | c_write("Access denied\r\n", 15); |
| 851 | logevent("Authentication refused"); |
| 852 | } else if (pktin.type == SSH_MSG_DISCONNECT) { |
| 853 | logevent("Received disconnect request"); |
| 854 | ssh_state = SSH_STATE_CLOSED; |
| 855 | crReturn(1); |
| 856 | } else if (pktin.type != SSH_SMSG_SUCCESS) { |
| 857 | fatalbox("Strange packet received, type %d", pktin.type); |
| 858 | } |
| 859 | } |
| 860 | |
| 861 | logevent("Authentication successful"); |
| 862 | |
| 863 | crFinish(1); |
| 864 | } |
| 865 | |
| 866 | static void ssh_protocol(unsigned char *in, int inlen, int ispkt) { |
| 867 | crBegin; |
| 868 | |
| 869 | random_init(); |
| 870 | |
| 871 | while (!do_ssh_login(in, inlen, ispkt)) { |
| 872 | crReturnV; |
| 873 | } |
| 874 | if (ssh_state == SSH_STATE_CLOSED) |
| 875 | crReturnV; |
| 876 | |
| 877 | if (!cfg.nopty) { |
| 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); |
| 884 | ssh_state = SSH_STATE_INTERMED; |
| 885 | do { crReturnV; } while (!ispkt); |
| 886 | if (pktin.type != SSH_SMSG_SUCCESS && pktin.type != SSH_SMSG_FAILURE) { |
| 887 | fatalbox("Protocol confusion"); |
| 888 | } else if (pktin.type == SSH_SMSG_FAILURE) { |
| 889 | c_write("Server refused to allocate pty\r\n", 32); |
| 890 | } |
| 891 | logevent("Allocated pty"); |
| 892 | } |
| 893 | |
| 894 | send_packet(SSH_CMSG_EXEC_SHELL, PKT_END); |
| 895 | logevent("Started session"); |
| 896 | |
| 897 | ssh_state = SSH_STATE_SESSION; |
| 898 | if (size_needed) |
| 899 | ssh_size(); |
| 900 | |
| 901 | while (1) { |
| 902 | crReturnV; |
| 903 | if (ispkt) { |
| 904 | if (pktin.type == SSH_SMSG_STDOUT_DATA || |
| 905 | pktin.type == SSH_SMSG_STDERR_DATA) { |
| 906 | long len = GET_32BIT(pktin.body); |
| 907 | c_write(pktin.body+4, len); |
| 908 | } else if (pktin.type == SSH_MSG_DISCONNECT) { |
| 909 | ssh_state = SSH_STATE_CLOSED; |
| 910 | logevent("Received disconnect request"); |
| 911 | } else if (pktin.type == SSH_SMSG_SUCCESS) { |
| 912 | /* may be from EXEC_SHELL on some servers */ |
| 913 | } else if (pktin.type == SSH_SMSG_FAILURE) { |
| 914 | /* may be from EXEC_SHELL on some servers |
| 915 | * if no pty is available or in other odd cases. Ignore */ |
| 916 | } else if (pktin.type == SSH_SMSG_EXIT_STATUS) { |
| 917 | send_packet(SSH_CMSG_EXIT_CONFIRMATION, PKT_END); |
| 918 | } else { |
| 919 | fatalbox("Strange packet received: type %d", pktin.type); |
| 920 | } |
| 921 | } else { |
| 922 | send_packet(SSH_CMSG_STDIN_DATA, |
| 923 | PKT_INT, inlen, PKT_DATA, in, inlen, PKT_END); |
| 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. |
| 936 | */ |
| 937 | static char *ssh_init (HWND hwnd, char *host, int port, char **realhost) { |
| 938 | char *p; |
| 939 | |
| 940 | #ifdef MSCRYPTOAPI |
| 941 | if(crypto_startup() == 0) |
| 942 | return "Microsoft high encryption pack not installed!"; |
| 943 | #endif |
| 944 | |
| 945 | p = connect_to_host(host, port, realhost); |
| 946 | if (p != NULL) |
| 947 | return p; |
| 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 | |
| 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; |
| 978 | |
| 979 | if (WSAGETSELECTERROR(lParam) != 0) |
| 980 | return -WSAGETSELECTERROR(lParam); |
| 981 | |
| 982 | switch (WSAGETSELECTEVENT(lParam)) { |
| 983 | case FD_READ: |
| 984 | case FD_CLOSE: |
| 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; |
| 992 | return 0; |
| 993 | } |
| 994 | ssh_gotdata (buf, ret); |
| 995 | if (ssh_state == SSH_STATE_CLOSED) { |
| 996 | closesocket(s); |
| 997 | s = INVALID_SOCKET; |
| 998 | return 0; |
| 999 | } |
| 1000 | return 1; |
| 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: |
| 1021 | case SSH_STATE_CLOSED: |
| 1022 | break; /* do nothing */ |
| 1023 | case SSH_STATE_INTERMED: |
| 1024 | size_needed = TRUE; /* buffer for later */ |
| 1025 | break; |
| 1026 | case SSH_STATE_SESSION: |
| 1027 | if (!cfg.nopty) { |
| 1028 | send_packet(SSH_CMSG_WINDOW_SIZE, |
| 1029 | PKT_INT, rows, PKT_INT, cols, |
| 1030 | PKT_INT, 0, PKT_INT, 0, PKT_END); |
| 1031 | } |
| 1032 | } |
| 1033 | } |
| 1034 | |
| 1035 | /* |
| 1036 | * (Send Telnet special codes) |
| 1037 | */ |
| 1038 | static void ssh_special (Telnet_Special code) { |
| 1039 | /* do nothing */ |
| 1040 | } |
| 1041 | |
| 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"; |
| 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 | } |
| 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 | |
| 1215 | Backend ssh_backend = { |
| 1216 | ssh_init, |
| 1217 | ssh_msg, |
| 1218 | ssh_send, |
| 1219 | ssh_size, |
| 1220 | ssh_special |
| 1221 | }; |
| 1222 | |