Mike Lockwood | 1305e95 | 2011-12-07 08:17:59 -0800 | [diff] [blame] | 1 | /* $OpenBSD: ssh-keyscan.c,v 1.85 2011/03/15 10:36:02 okan Exp $ */ |
| 2 | /* |
| 3 | * Copyright 1995, 1996 by David Mazieres <dm@lcs.mit.edu>. |
| 4 | * |
| 5 | * Modification and redistribution in source and binary forms is |
| 6 | * permitted provided that due credit is given to the author and the |
| 7 | * OpenBSD project by leaving this copyright notice intact. |
| 8 | */ |
| 9 | |
| 10 | #include "includes.h" |
| 11 | |
| 12 | #include "openbsd-compat/sys-queue.h" |
| 13 | #include <sys/resource.h> |
| 14 | #ifdef HAVE_SYS_TIME_H |
| 15 | # include <sys/time.h> |
| 16 | #endif |
| 17 | |
| 18 | #include <netinet/in.h> |
| 19 | #include <arpa/inet.h> |
| 20 | |
| 21 | #include <openssl/bn.h> |
| 22 | |
| 23 | #include <netdb.h> |
| 24 | #include <errno.h> |
| 25 | #include <setjmp.h> |
| 26 | #include <stdarg.h> |
| 27 | #include <stdio.h> |
| 28 | #include <stdlib.h> |
| 29 | #include <signal.h> |
| 30 | #include <string.h> |
| 31 | #include <unistd.h> |
| 32 | |
| 33 | #include "xmalloc.h" |
| 34 | #include "ssh.h" |
| 35 | #include "ssh1.h" |
| 36 | #include "buffer.h" |
| 37 | #include "key.h" |
| 38 | #include "cipher.h" |
| 39 | #include "kex.h" |
| 40 | #include "compat.h" |
| 41 | #include "myproposal.h" |
| 42 | #include "packet.h" |
| 43 | #include "dispatch.h" |
| 44 | #include "log.h" |
| 45 | #include "atomicio.h" |
| 46 | #include "misc.h" |
| 47 | #include "hostfile.h" |
| 48 | |
| 49 | /* Flag indicating whether IPv4 or IPv6. This can be set on the command line. |
| 50 | Default value is AF_UNSPEC means both IPv4 and IPv6. */ |
| 51 | int IPv4or6 = AF_UNSPEC; |
| 52 | |
| 53 | int ssh_port = SSH_DEFAULT_PORT; |
| 54 | |
| 55 | #define KT_RSA1 1 |
| 56 | #define KT_DSA 2 |
| 57 | #define KT_RSA 4 |
| 58 | #define KT_ECDSA 8 |
| 59 | |
| 60 | int get_keytypes = KT_RSA; /* Get only RSA keys by default */ |
| 61 | |
| 62 | int hash_hosts = 0; /* Hash hostname on output */ |
| 63 | |
| 64 | #define MAXMAXFD 256 |
| 65 | |
| 66 | /* The number of seconds after which to give up on a TCP connection */ |
| 67 | int timeout = 5; |
| 68 | |
| 69 | int maxfd; |
| 70 | #define MAXCON (maxfd - 10) |
| 71 | |
| 72 | extern char *__progname; |
| 73 | fd_set *read_wait; |
| 74 | size_t read_wait_nfdset; |
| 75 | int ncon; |
| 76 | int nonfatal_fatal = 0; |
| 77 | jmp_buf kexjmp; |
| 78 | Key *kexjmp_key; |
| 79 | |
| 80 | /* |
| 81 | * Keep a connection structure for each file descriptor. The state |
| 82 | * associated with file descriptor n is held in fdcon[n]. |
| 83 | */ |
| 84 | typedef struct Connection { |
| 85 | u_char c_status; /* State of connection on this file desc. */ |
| 86 | #define CS_UNUSED 0 /* File descriptor unused */ |
| 87 | #define CS_CON 1 /* Waiting to connect/read greeting */ |
| 88 | #define CS_SIZE 2 /* Waiting to read initial packet size */ |
| 89 | #define CS_KEYS 3 /* Waiting to read public key packet */ |
| 90 | int c_fd; /* Quick lookup: c->c_fd == c - fdcon */ |
| 91 | int c_plen; /* Packet length field for ssh packet */ |
| 92 | int c_len; /* Total bytes which must be read. */ |
| 93 | int c_off; /* Length of data read so far. */ |
| 94 | int c_keytype; /* Only one of KT_RSA1, KT_DSA, or KT_RSA */ |
| 95 | char *c_namebase; /* Address to free for c_name and c_namelist */ |
| 96 | char *c_name; /* Hostname of connection for errors */ |
| 97 | char *c_namelist; /* Pointer to other possible addresses */ |
| 98 | char *c_output_name; /* Hostname of connection for output */ |
| 99 | char *c_data; /* Data read from this fd */ |
| 100 | Kex *c_kex; /* The key-exchange struct for ssh2 */ |
| 101 | struct timeval c_tv; /* Time at which connection gets aborted */ |
| 102 | TAILQ_ENTRY(Connection) c_link; /* List of connections in timeout order. */ |
| 103 | } con; |
| 104 | |
| 105 | TAILQ_HEAD(conlist, Connection) tq; /* Timeout Queue */ |
| 106 | con *fdcon; |
| 107 | |
| 108 | static int |
| 109 | fdlim_get(int hard) |
| 110 | { |
| 111 | #if defined(HAVE_GETRLIMIT) && defined(RLIMIT_NOFILE) |
| 112 | struct rlimit rlfd; |
| 113 | |
| 114 | if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0) |
| 115 | return (-1); |
| 116 | if ((hard ? rlfd.rlim_max : rlfd.rlim_cur) == RLIM_INFINITY) |
| 117 | return SSH_SYSFDMAX; |
| 118 | else |
| 119 | return hard ? rlfd.rlim_max : rlfd.rlim_cur; |
| 120 | #else |
| 121 | return SSH_SYSFDMAX; |
| 122 | #endif |
| 123 | } |
| 124 | |
| 125 | static int |
| 126 | fdlim_set(int lim) |
| 127 | { |
| 128 | #if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE) |
| 129 | struct rlimit rlfd; |
| 130 | #endif |
| 131 | |
| 132 | if (lim <= 0) |
| 133 | return (-1); |
| 134 | #if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE) |
| 135 | if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0) |
| 136 | return (-1); |
| 137 | rlfd.rlim_cur = lim; |
| 138 | if (setrlimit(RLIMIT_NOFILE, &rlfd) < 0) |
| 139 | return (-1); |
| 140 | #elif defined (HAVE_SETDTABLESIZE) |
| 141 | setdtablesize(lim); |
| 142 | #endif |
| 143 | return (0); |
| 144 | } |
| 145 | |
| 146 | /* |
| 147 | * This is an strsep function that returns a null field for adjacent |
| 148 | * separators. This is the same as the 4.4BSD strsep, but different from the |
| 149 | * one in the GNU libc. |
| 150 | */ |
| 151 | static char * |
| 152 | xstrsep(char **str, const char *delim) |
| 153 | { |
| 154 | char *s, *e; |
| 155 | |
| 156 | if (!**str) |
| 157 | return (NULL); |
| 158 | |
| 159 | s = *str; |
| 160 | e = s + strcspn(s, delim); |
| 161 | |
| 162 | if (*e != '\0') |
| 163 | *e++ = '\0'; |
| 164 | *str = e; |
| 165 | |
| 166 | return (s); |
| 167 | } |
| 168 | |
| 169 | /* |
| 170 | * Get the next non-null token (like GNU strsep). Strsep() will return a |
| 171 | * null token for two adjacent separators, so we may have to loop. |
| 172 | */ |
| 173 | static char * |
| 174 | strnnsep(char **stringp, char *delim) |
| 175 | { |
| 176 | char *tok; |
| 177 | |
| 178 | do { |
| 179 | tok = xstrsep(stringp, delim); |
| 180 | } while (tok && *tok == '\0'); |
| 181 | return (tok); |
| 182 | } |
| 183 | |
| 184 | static Key * |
| 185 | keygrab_ssh1(con *c) |
| 186 | { |
| 187 | static Key *rsa; |
| 188 | static Buffer msg; |
| 189 | |
| 190 | if (rsa == NULL) { |
| 191 | buffer_init(&msg); |
| 192 | rsa = key_new(KEY_RSA1); |
| 193 | } |
| 194 | buffer_append(&msg, c->c_data, c->c_plen); |
| 195 | buffer_consume(&msg, 8 - (c->c_plen & 7)); /* padding */ |
| 196 | if (buffer_get_char(&msg) != (int) SSH_SMSG_PUBLIC_KEY) { |
| 197 | error("%s: invalid packet type", c->c_name); |
| 198 | buffer_clear(&msg); |
| 199 | return NULL; |
| 200 | } |
| 201 | buffer_consume(&msg, 8); /* cookie */ |
| 202 | |
| 203 | /* server key */ |
| 204 | (void) buffer_get_int(&msg); |
| 205 | buffer_get_bignum(&msg, rsa->rsa->e); |
| 206 | buffer_get_bignum(&msg, rsa->rsa->n); |
| 207 | |
| 208 | /* host key */ |
| 209 | (void) buffer_get_int(&msg); |
| 210 | buffer_get_bignum(&msg, rsa->rsa->e); |
| 211 | buffer_get_bignum(&msg, rsa->rsa->n); |
| 212 | |
| 213 | buffer_clear(&msg); |
| 214 | |
| 215 | return (rsa); |
| 216 | } |
| 217 | |
| 218 | static int |
| 219 | hostjump(Key *hostkey) |
| 220 | { |
| 221 | kexjmp_key = hostkey; |
| 222 | longjmp(kexjmp, 1); |
| 223 | } |
| 224 | |
| 225 | static int |
| 226 | ssh2_capable(int remote_major, int remote_minor) |
| 227 | { |
| 228 | switch (remote_major) { |
| 229 | case 1: |
| 230 | if (remote_minor == 99) |
| 231 | return 1; |
| 232 | break; |
| 233 | case 2: |
| 234 | return 1; |
| 235 | default: |
| 236 | break; |
| 237 | } |
| 238 | return 0; |
| 239 | } |
| 240 | |
| 241 | static Key * |
| 242 | keygrab_ssh2(con *c) |
| 243 | { |
| 244 | int j; |
| 245 | |
| 246 | packet_set_connection(c->c_fd, c->c_fd); |
| 247 | enable_compat20(); |
| 248 | myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = c->c_keytype == KT_DSA? |
| 249 | "ssh-dss" : (c->c_keytype == KT_RSA ? "ssh-rsa" : |
| 250 | "ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521"); |
| 251 | c->c_kex = kex_setup(myproposal); |
| 252 | c->c_kex->kex[KEX_DH_GRP1_SHA1] = kexdh_client; |
| 253 | c->c_kex->kex[KEX_DH_GRP14_SHA1] = kexdh_client; |
| 254 | c->c_kex->kex[KEX_DH_GEX_SHA1] = kexgex_client; |
| 255 | c->c_kex->kex[KEX_DH_GEX_SHA256] = kexgex_client; |
| 256 | c->c_kex->kex[KEX_ECDH_SHA2] = kexecdh_client; |
| 257 | c->c_kex->verify_host_key = hostjump; |
| 258 | |
| 259 | if (!(j = setjmp(kexjmp))) { |
| 260 | nonfatal_fatal = 1; |
| 261 | dispatch_run(DISPATCH_BLOCK, &c->c_kex->done, c->c_kex); |
| 262 | fprintf(stderr, "Impossible! dispatch_run() returned!\n"); |
| 263 | exit(1); |
| 264 | } |
| 265 | nonfatal_fatal = 0; |
| 266 | xfree(c->c_kex); |
| 267 | c->c_kex = NULL; |
| 268 | packet_close(); |
| 269 | |
| 270 | return j < 0? NULL : kexjmp_key; |
| 271 | } |
| 272 | |
| 273 | static void |
| 274 | keyprint(con *c, Key *key) |
| 275 | { |
| 276 | char *host = c->c_output_name ? c->c_output_name : c->c_name; |
| 277 | |
| 278 | if (!key) |
| 279 | return; |
| 280 | if (hash_hosts && (host = host_hash(host, NULL, 0)) == NULL) |
| 281 | fatal("host_hash failed"); |
| 282 | |
| 283 | fprintf(stdout, "%s ", host); |
| 284 | key_write(key, stdout); |
| 285 | fputs("\n", stdout); |
| 286 | } |
| 287 | |
| 288 | static int |
| 289 | tcpconnect(char *host) |
| 290 | { |
| 291 | struct addrinfo hints, *ai, *aitop; |
| 292 | char strport[NI_MAXSERV]; |
| 293 | int gaierr, s = -1; |
| 294 | |
| 295 | snprintf(strport, sizeof strport, "%d", ssh_port); |
| 296 | memset(&hints, 0, sizeof(hints)); |
| 297 | hints.ai_family = IPv4or6; |
| 298 | hints.ai_socktype = SOCK_STREAM; |
| 299 | if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) |
| 300 | fatal("getaddrinfo %s: %s", host, ssh_gai_strerror(gaierr)); |
| 301 | for (ai = aitop; ai; ai = ai->ai_next) { |
| 302 | s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); |
| 303 | if (s < 0) { |
| 304 | error("socket: %s", strerror(errno)); |
| 305 | continue; |
| 306 | } |
| 307 | if (set_nonblock(s) == -1) |
| 308 | fatal("%s: set_nonblock(%d)", __func__, s); |
| 309 | if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0 && |
| 310 | errno != EINPROGRESS) |
| 311 | error("connect (`%s'): %s", host, strerror(errno)); |
| 312 | else |
| 313 | break; |
| 314 | close(s); |
| 315 | s = -1; |
| 316 | } |
| 317 | freeaddrinfo(aitop); |
| 318 | return s; |
| 319 | } |
| 320 | |
| 321 | static int |
| 322 | conalloc(char *iname, char *oname, int keytype) |
| 323 | { |
| 324 | char *namebase, *name, *namelist; |
| 325 | int s; |
| 326 | |
| 327 | namebase = namelist = xstrdup(iname); |
| 328 | |
| 329 | do { |
| 330 | name = xstrsep(&namelist, ","); |
| 331 | if (!name) { |
| 332 | xfree(namebase); |
| 333 | return (-1); |
| 334 | } |
| 335 | } while ((s = tcpconnect(name)) < 0); |
| 336 | |
| 337 | if (s >= maxfd) |
| 338 | fatal("conalloc: fdno %d too high", s); |
| 339 | if (fdcon[s].c_status) |
| 340 | fatal("conalloc: attempt to reuse fdno %d", s); |
| 341 | |
| 342 | fdcon[s].c_fd = s; |
| 343 | fdcon[s].c_status = CS_CON; |
| 344 | fdcon[s].c_namebase = namebase; |
| 345 | fdcon[s].c_name = name; |
| 346 | fdcon[s].c_namelist = namelist; |
| 347 | fdcon[s].c_output_name = xstrdup(oname); |
| 348 | fdcon[s].c_data = (char *) &fdcon[s].c_plen; |
| 349 | fdcon[s].c_len = 4; |
| 350 | fdcon[s].c_off = 0; |
| 351 | fdcon[s].c_keytype = keytype; |
| 352 | gettimeofday(&fdcon[s].c_tv, NULL); |
| 353 | fdcon[s].c_tv.tv_sec += timeout; |
| 354 | TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link); |
| 355 | FD_SET(s, read_wait); |
| 356 | ncon++; |
| 357 | return (s); |
| 358 | } |
| 359 | |
| 360 | static void |
| 361 | confree(int s) |
| 362 | { |
| 363 | if (s >= maxfd || fdcon[s].c_status == CS_UNUSED) |
| 364 | fatal("confree: attempt to free bad fdno %d", s); |
| 365 | close(s); |
| 366 | xfree(fdcon[s].c_namebase); |
| 367 | xfree(fdcon[s].c_output_name); |
| 368 | if (fdcon[s].c_status == CS_KEYS) |
| 369 | xfree(fdcon[s].c_data); |
| 370 | fdcon[s].c_status = CS_UNUSED; |
| 371 | fdcon[s].c_keytype = 0; |
| 372 | TAILQ_REMOVE(&tq, &fdcon[s], c_link); |
| 373 | FD_CLR(s, read_wait); |
| 374 | ncon--; |
| 375 | } |
| 376 | |
| 377 | static void |
| 378 | contouch(int s) |
| 379 | { |
| 380 | TAILQ_REMOVE(&tq, &fdcon[s], c_link); |
| 381 | gettimeofday(&fdcon[s].c_tv, NULL); |
| 382 | fdcon[s].c_tv.tv_sec += timeout; |
| 383 | TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link); |
| 384 | } |
| 385 | |
| 386 | static int |
| 387 | conrecycle(int s) |
| 388 | { |
| 389 | con *c = &fdcon[s]; |
| 390 | int ret; |
| 391 | |
| 392 | ret = conalloc(c->c_namelist, c->c_output_name, c->c_keytype); |
| 393 | confree(s); |
| 394 | return (ret); |
| 395 | } |
| 396 | |
| 397 | static void |
| 398 | congreet(int s) |
| 399 | { |
| 400 | int n = 0, remote_major = 0, remote_minor = 0; |
| 401 | char buf[256], *cp; |
| 402 | char remote_version[sizeof buf]; |
| 403 | size_t bufsiz; |
| 404 | con *c = &fdcon[s]; |
| 405 | |
| 406 | for (;;) { |
| 407 | memset(buf, '\0', sizeof(buf)); |
| 408 | bufsiz = sizeof(buf); |
| 409 | cp = buf; |
| 410 | while (bufsiz-- && |
| 411 | (n = atomicio(read, s, cp, 1)) == 1 && *cp != '\n') { |
| 412 | if (*cp == '\r') |
| 413 | *cp = '\n'; |
| 414 | cp++; |
| 415 | } |
| 416 | if (n != 1 || strncmp(buf, "SSH-", 4) == 0) |
| 417 | break; |
| 418 | } |
| 419 | if (n == 0) { |
| 420 | switch (errno) { |
| 421 | case EPIPE: |
| 422 | error("%s: Connection closed by remote host", c->c_name); |
| 423 | break; |
| 424 | case ECONNREFUSED: |
| 425 | break; |
| 426 | default: |
| 427 | error("read (%s): %s", c->c_name, strerror(errno)); |
| 428 | break; |
| 429 | } |
| 430 | conrecycle(s); |
| 431 | return; |
| 432 | } |
| 433 | if (*cp != '\n' && *cp != '\r') { |
| 434 | error("%s: bad greeting", c->c_name); |
| 435 | confree(s); |
| 436 | return; |
| 437 | } |
| 438 | *cp = '\0'; |
| 439 | if (sscanf(buf, "SSH-%d.%d-%[^\n]\n", |
| 440 | &remote_major, &remote_minor, remote_version) == 3) |
| 441 | compat_datafellows(remote_version); |
| 442 | else |
| 443 | datafellows = 0; |
| 444 | if (c->c_keytype != KT_RSA1) { |
| 445 | if (!ssh2_capable(remote_major, remote_minor)) { |
| 446 | debug("%s doesn't support ssh2", c->c_name); |
| 447 | confree(s); |
| 448 | return; |
| 449 | } |
| 450 | } else if (remote_major != 1) { |
| 451 | debug("%s doesn't support ssh1", c->c_name); |
| 452 | confree(s); |
| 453 | return; |
| 454 | } |
| 455 | fprintf(stderr, "# %s %s\n", c->c_name, chop(buf)); |
| 456 | n = snprintf(buf, sizeof buf, "SSH-%d.%d-OpenSSH-keyscan\r\n", |
| 457 | c->c_keytype == KT_RSA1? PROTOCOL_MAJOR_1 : PROTOCOL_MAJOR_2, |
| 458 | c->c_keytype == KT_RSA1? PROTOCOL_MINOR_1 : PROTOCOL_MINOR_2); |
| 459 | if (n < 0 || (size_t)n >= sizeof(buf)) { |
| 460 | error("snprintf: buffer too small"); |
| 461 | confree(s); |
| 462 | return; |
| 463 | } |
| 464 | if (atomicio(vwrite, s, buf, n) != (size_t)n) { |
| 465 | error("write (%s): %s", c->c_name, strerror(errno)); |
| 466 | confree(s); |
| 467 | return; |
| 468 | } |
| 469 | if (c->c_keytype != KT_RSA1) { |
| 470 | keyprint(c, keygrab_ssh2(c)); |
| 471 | confree(s); |
| 472 | return; |
| 473 | } |
| 474 | c->c_status = CS_SIZE; |
| 475 | contouch(s); |
| 476 | } |
| 477 | |
| 478 | static void |
| 479 | conread(int s) |
| 480 | { |
| 481 | con *c = &fdcon[s]; |
| 482 | size_t n; |
| 483 | |
| 484 | if (c->c_status == CS_CON) { |
| 485 | congreet(s); |
| 486 | return; |
| 487 | } |
| 488 | n = atomicio(read, s, c->c_data + c->c_off, c->c_len - c->c_off); |
| 489 | if (n == 0) { |
| 490 | error("read (%s): %s", c->c_name, strerror(errno)); |
| 491 | confree(s); |
| 492 | return; |
| 493 | } |
| 494 | c->c_off += n; |
| 495 | |
| 496 | if (c->c_off == c->c_len) |
| 497 | switch (c->c_status) { |
| 498 | case CS_SIZE: |
| 499 | c->c_plen = htonl(c->c_plen); |
| 500 | c->c_len = c->c_plen + 8 - (c->c_plen & 7); |
| 501 | c->c_off = 0; |
| 502 | c->c_data = xmalloc(c->c_len); |
| 503 | c->c_status = CS_KEYS; |
| 504 | break; |
| 505 | case CS_KEYS: |
| 506 | keyprint(c, keygrab_ssh1(c)); |
| 507 | confree(s); |
| 508 | return; |
| 509 | default: |
| 510 | fatal("conread: invalid status %d", c->c_status); |
| 511 | break; |
| 512 | } |
| 513 | |
| 514 | contouch(s); |
| 515 | } |
| 516 | |
| 517 | static void |
| 518 | conloop(void) |
| 519 | { |
| 520 | struct timeval seltime, now; |
| 521 | fd_set *r, *e; |
| 522 | con *c; |
| 523 | int i; |
| 524 | |
| 525 | gettimeofday(&now, NULL); |
| 526 | c = TAILQ_FIRST(&tq); |
| 527 | |
| 528 | if (c && (c->c_tv.tv_sec > now.tv_sec || |
| 529 | (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec > now.tv_usec))) { |
| 530 | seltime = c->c_tv; |
| 531 | seltime.tv_sec -= now.tv_sec; |
| 532 | seltime.tv_usec -= now.tv_usec; |
| 533 | if (seltime.tv_usec < 0) { |
| 534 | seltime.tv_usec += 1000000; |
| 535 | seltime.tv_sec--; |
| 536 | } |
| 537 | } else |
| 538 | timerclear(&seltime); |
| 539 | |
| 540 | r = xcalloc(read_wait_nfdset, sizeof(fd_mask)); |
| 541 | e = xcalloc(read_wait_nfdset, sizeof(fd_mask)); |
| 542 | memcpy(r, read_wait, read_wait_nfdset * sizeof(fd_mask)); |
| 543 | memcpy(e, read_wait, read_wait_nfdset * sizeof(fd_mask)); |
| 544 | |
| 545 | while (select(maxfd, r, NULL, e, &seltime) == -1 && |
| 546 | (errno == EAGAIN || errno == EINTR || errno == EWOULDBLOCK)) |
| 547 | ; |
| 548 | |
| 549 | for (i = 0; i < maxfd; i++) { |
| 550 | if (FD_ISSET(i, e)) { |
| 551 | error("%s: exception!", fdcon[i].c_name); |
| 552 | confree(i); |
| 553 | } else if (FD_ISSET(i, r)) |
| 554 | conread(i); |
| 555 | } |
| 556 | xfree(r); |
| 557 | xfree(e); |
| 558 | |
| 559 | c = TAILQ_FIRST(&tq); |
| 560 | while (c && (c->c_tv.tv_sec < now.tv_sec || |
| 561 | (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec < now.tv_usec))) { |
| 562 | int s = c->c_fd; |
| 563 | |
| 564 | c = TAILQ_NEXT(c, c_link); |
| 565 | conrecycle(s); |
| 566 | } |
| 567 | } |
| 568 | |
| 569 | static void |
| 570 | do_host(char *host) |
| 571 | { |
| 572 | char *name = strnnsep(&host, " \t\n"); |
| 573 | int j; |
| 574 | |
| 575 | if (name == NULL) |
| 576 | return; |
| 577 | for (j = KT_RSA1; j <= KT_ECDSA; j *= 2) { |
| 578 | if (get_keytypes & j) { |
| 579 | while (ncon >= MAXCON) |
| 580 | conloop(); |
| 581 | conalloc(name, *host ? host : name, j); |
| 582 | } |
| 583 | } |
| 584 | } |
| 585 | |
| 586 | void |
| 587 | fatal(const char *fmt,...) |
| 588 | { |
| 589 | va_list args; |
| 590 | |
| 591 | va_start(args, fmt); |
| 592 | do_log(SYSLOG_LEVEL_FATAL, fmt, args); |
| 593 | va_end(args); |
| 594 | if (nonfatal_fatal) |
| 595 | longjmp(kexjmp, -1); |
| 596 | else |
| 597 | exit(255); |
| 598 | } |
| 599 | |
| 600 | static void |
| 601 | usage(void) |
| 602 | { |
| 603 | fprintf(stderr, |
| 604 | "usage: %s [-46Hv] [-f file] [-p port] [-T timeout] [-t type]\n" |
| 605 | "\t\t [host | addrlist namelist] ...\n", |
| 606 | __progname); |
| 607 | exit(1); |
| 608 | } |
| 609 | |
| 610 | int |
| 611 | main(int argc, char **argv) |
| 612 | { |
| 613 | int debug_flag = 0, log_level = SYSLOG_LEVEL_INFO; |
| 614 | int opt, fopt_count = 0, j; |
| 615 | char *tname, *cp, line[NI_MAXHOST]; |
| 616 | FILE *fp; |
| 617 | u_long linenum; |
| 618 | |
| 619 | extern int optind; |
| 620 | extern char *optarg; |
| 621 | |
| 622 | __progname = ssh_get_progname(argv[0]); |
| 623 | seed_rng(); |
| 624 | TAILQ_INIT(&tq); |
| 625 | |
| 626 | /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ |
| 627 | sanitise_stdfd(); |
| 628 | |
| 629 | if (argc <= 1) |
| 630 | usage(); |
| 631 | |
| 632 | while ((opt = getopt(argc, argv, "Hv46p:T:t:f:")) != -1) { |
| 633 | switch (opt) { |
| 634 | case 'H': |
| 635 | hash_hosts = 1; |
| 636 | break; |
| 637 | case 'p': |
| 638 | ssh_port = a2port(optarg); |
| 639 | if (ssh_port <= 0) { |
| 640 | fprintf(stderr, "Bad port '%s'\n", optarg); |
| 641 | exit(1); |
| 642 | } |
| 643 | break; |
| 644 | case 'T': |
| 645 | timeout = convtime(optarg); |
| 646 | if (timeout == -1 || timeout == 0) { |
| 647 | fprintf(stderr, "Bad timeout '%s'\n", optarg); |
| 648 | usage(); |
| 649 | } |
| 650 | break; |
| 651 | case 'v': |
| 652 | if (!debug_flag) { |
| 653 | debug_flag = 1; |
| 654 | log_level = SYSLOG_LEVEL_DEBUG1; |
| 655 | } |
| 656 | else if (log_level < SYSLOG_LEVEL_DEBUG3) |
| 657 | log_level++; |
| 658 | else |
| 659 | fatal("Too high debugging level."); |
| 660 | break; |
| 661 | case 'f': |
| 662 | if (strcmp(optarg, "-") == 0) |
| 663 | optarg = NULL; |
| 664 | argv[fopt_count++] = optarg; |
| 665 | break; |
| 666 | case 't': |
| 667 | get_keytypes = 0; |
| 668 | tname = strtok(optarg, ","); |
| 669 | while (tname) { |
| 670 | int type = key_type_from_name(tname); |
| 671 | switch (type) { |
| 672 | case KEY_RSA1: |
| 673 | get_keytypes |= KT_RSA1; |
| 674 | break; |
| 675 | case KEY_DSA: |
| 676 | get_keytypes |= KT_DSA; |
| 677 | break; |
| 678 | case KEY_ECDSA: |
| 679 | get_keytypes |= KT_ECDSA; |
| 680 | break; |
| 681 | case KEY_RSA: |
| 682 | get_keytypes |= KT_RSA; |
| 683 | break; |
| 684 | case KEY_UNSPEC: |
| 685 | fatal("unknown key type %s", tname); |
| 686 | } |
| 687 | tname = strtok(NULL, ","); |
| 688 | } |
| 689 | break; |
| 690 | case '4': |
| 691 | IPv4or6 = AF_INET; |
| 692 | break; |
| 693 | case '6': |
| 694 | IPv4or6 = AF_INET6; |
| 695 | break; |
| 696 | case '?': |
| 697 | default: |
| 698 | usage(); |
| 699 | } |
| 700 | } |
| 701 | if (optind == argc && !fopt_count) |
| 702 | usage(); |
| 703 | |
| 704 | log_init("ssh-keyscan", log_level, SYSLOG_FACILITY_USER, 1); |
| 705 | |
| 706 | maxfd = fdlim_get(1); |
| 707 | if (maxfd < 0) |
| 708 | fatal("%s: fdlim_get: bad value", __progname); |
| 709 | if (maxfd > MAXMAXFD) |
| 710 | maxfd = MAXMAXFD; |
| 711 | if (MAXCON <= 0) |
| 712 | fatal("%s: not enough file descriptors", __progname); |
| 713 | if (maxfd > fdlim_get(0)) |
| 714 | fdlim_set(maxfd); |
| 715 | fdcon = xcalloc(maxfd, sizeof(con)); |
| 716 | |
| 717 | read_wait_nfdset = howmany(maxfd, NFDBITS); |
| 718 | read_wait = xcalloc(read_wait_nfdset, sizeof(fd_mask)); |
| 719 | |
| 720 | for (j = 0; j < fopt_count; j++) { |
| 721 | if (argv[j] == NULL) |
| 722 | fp = stdin; |
| 723 | else if ((fp = fopen(argv[j], "r")) == NULL) |
| 724 | fatal("%s: %s: %s", __progname, argv[j], |
| 725 | strerror(errno)); |
| 726 | linenum = 0; |
| 727 | |
| 728 | while (read_keyfile_line(fp, |
| 729 | argv[j] == NULL ? "(stdin)" : argv[j], line, sizeof(line), |
| 730 | &linenum) != -1) { |
| 731 | /* Chomp off trailing whitespace and comments */ |
| 732 | if ((cp = strchr(line, '#')) == NULL) |
| 733 | cp = line + strlen(line) - 1; |
| 734 | while (cp >= line) { |
| 735 | if (*cp == ' ' || *cp == '\t' || |
| 736 | *cp == '\n' || *cp == '#') |
| 737 | *cp-- = '\0'; |
| 738 | else |
| 739 | break; |
| 740 | } |
| 741 | |
| 742 | /* Skip empty lines */ |
| 743 | if (*line == '\0') |
| 744 | continue; |
| 745 | |
| 746 | do_host(line); |
| 747 | } |
| 748 | |
| 749 | if (ferror(fp)) |
| 750 | fatal("%s: %s: %s", __progname, argv[j], |
| 751 | strerror(errno)); |
| 752 | |
| 753 | fclose(fp); |
| 754 | } |
| 755 | |
| 756 | while (optind < argc) |
| 757 | do_host(argv[optind++]); |
| 758 | |
| 759 | while (ncon > 0) |
| 760 | conloop(); |
| 761 | |
| 762 | return (0); |
| 763 | } |