1 /* $OpenBSD: ssh-keyscan.c,v 1.106 2016/05/02 10:26:04 djm 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 <sys/types.h> 11 #include <sys/socket.h> 12 #include <sys/queue.h> 13 #include <sys/time.h> 14 #include <sys/resource.h> 15 16 #include <openssl/bn.h> 17 18 #include <errno.h> 19 #include <netdb.h> 20 #include <stdarg.h> 21 #include <stdio.h> 22 #include <stdlib.h> 23 #include <signal.h> 24 #include <string.h> 25 #include <unistd.h> 26 27 #include "xmalloc.h" 28 #include "ssh.h" 29 #include "ssh1.h" 30 #include "sshbuf.h" 31 #include "sshkey.h" 32 #include "cipher.h" 33 #include "kex.h" 34 #include "compat.h" 35 #include "myproposal.h" 36 #include "packet.h" 37 #include "dispatch.h" 38 #include "log.h" 39 #include "atomicio.h" 40 #include "misc.h" 41 #include "hostfile.h" 42 #include "ssherr.h" 43 #include "ssh_api.h" 44 45 /* Flag indicating whether IPv4 or IPv6. This can be set on the command line. 46 Default value is AF_UNSPEC means both IPv4 and IPv6. */ 47 int IPv4or6 = AF_UNSPEC; 48 49 int ssh_port = SSH_DEFAULT_PORT; 50 51 #define KT_RSA1 1 52 #define KT_DSA 2 53 #define KT_RSA 4 54 #define KT_ECDSA 8 55 #define KT_ED25519 16 56 57 int get_cert = 0; 58 int get_keytypes = KT_RSA|KT_ECDSA|KT_ED25519; 59 60 int hash_hosts = 0; /* Hash hostname on output */ 61 62 #define MAXMAXFD 256 63 64 /* The number of seconds after which to give up on a TCP connection */ 65 int timeout = 5; 66 67 int maxfd; 68 #define MAXCON (maxfd - 10) 69 70 extern char *__progname; 71 fd_set *read_wait; 72 size_t read_wait_nfdset; 73 int ncon; 74 75 /* 76 * Keep a connection structure for each file descriptor. The state 77 * associated with file descriptor n is held in fdcon[n]. 78 */ 79 typedef struct Connection { 80 u_char c_status; /* State of connection on this file desc. */ 81 #define CS_UNUSED 0 /* File descriptor unused */ 82 #define CS_CON 1 /* Waiting to connect/read greeting */ 83 #define CS_SIZE 2 /* Waiting to read initial packet size */ 84 #define CS_KEYS 3 /* Waiting to read public key packet */ 85 int c_fd; /* Quick lookup: c->c_fd == c - fdcon */ 86 int c_plen; /* Packet length field for ssh packet */ 87 int c_len; /* Total bytes which must be read. */ 88 int c_off; /* Length of data read so far. */ 89 int c_keytype; /* Only one of KT_RSA1, KT_DSA, or KT_RSA */ 90 sig_atomic_t c_done; /* SSH2 done */ 91 char *c_namebase; /* Address to free for c_name and c_namelist */ 92 char *c_name; /* Hostname of connection for errors */ 93 char *c_namelist; /* Pointer to other possible addresses */ 94 char *c_output_name; /* Hostname of connection for output */ 95 char *c_data; /* Data read from this fd */ 96 struct ssh *c_ssh; /* SSH-connection */ 97 struct timeval c_tv; /* Time at which connection gets aborted */ 98 TAILQ_ENTRY(Connection) c_link; /* List of connections in timeout order. */ 99 } con; 100 101 TAILQ_HEAD(conlist, Connection) tq; /* Timeout Queue */ 102 con *fdcon; 103 104 static void keyprint(con *c, struct sshkey *key); 105 106 static int 107 fdlim_get(int hard) 108 { 109 struct rlimit rlfd; 110 111 if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0) 112 return (-1); 113 if ((hard ? rlfd.rlim_max : rlfd.rlim_cur) == RLIM_INFINITY) 114 return sysconf(_SC_OPEN_MAX); 115 else 116 return hard ? rlfd.rlim_max : rlfd.rlim_cur; 117 } 118 119 static int 120 fdlim_set(int lim) 121 { 122 struct rlimit rlfd; 123 124 if (lim <= 0) 125 return (-1); 126 if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0) 127 return (-1); 128 rlfd.rlim_cur = lim; 129 if (setrlimit(RLIMIT_NOFILE, &rlfd) < 0) 130 return (-1); 131 return (0); 132 } 133 134 /* 135 * This is an strsep function that returns a null field for adjacent 136 * separators. This is the same as the 4.4BSD strsep, but different from the 137 * one in the GNU libc. 138 */ 139 static char * 140 xstrsep(char **str, const char *delim) 141 { 142 char *s, *e; 143 144 if (!**str) 145 return (NULL); 146 147 s = *str; 148 e = s + strcspn(s, delim); 149 150 if (*e != '\0') 151 *e++ = '\0'; 152 *str = e; 153 154 return (s); 155 } 156 157 /* 158 * Get the next non-null token (like GNU strsep). Strsep() will return a 159 * null token for two adjacent separators, so we may have to loop. 160 */ 161 static char * 162 strnnsep(char **stringp, char *delim) 163 { 164 char *tok; 165 166 do { 167 tok = xstrsep(stringp, delim); 168 } while (tok && *tok == '\0'); 169 return (tok); 170 } 171 172 #ifdef WITH_SSH1 173 static struct sshkey * 174 keygrab_ssh1(con *c) 175 { 176 static struct sshkey *rsa; 177 static struct sshbuf *msg; 178 int r; 179 u_char type; 180 181 if (rsa == NULL) { 182 if ((rsa = sshkey_new(KEY_RSA1)) == NULL) { 183 error("%s: sshkey_new failed", __func__); 184 return NULL; 185 } 186 if ((msg = sshbuf_new()) == NULL) 187 fatal("%s: sshbuf_new failed", __func__); 188 } 189 if ((r = sshbuf_put(msg, c->c_data, c->c_plen)) != 0 || 190 (r = sshbuf_consume(msg, 8 - (c->c_plen & 7))) != 0 || /* padding */ 191 (r = sshbuf_get_u8(msg, &type)) != 0) 192 goto buf_err; 193 if (type != (int) SSH_SMSG_PUBLIC_KEY) { 194 error("%s: invalid packet type", c->c_name); 195 sshbuf_reset(msg); 196 return NULL; 197 } 198 if ((r = sshbuf_consume(msg, 8)) != 0 || /* cookie */ 199 /* server key */ 200 (r = sshbuf_get_u32(msg, NULL)) != 0 || 201 (r = sshbuf_get_bignum1(msg, NULL)) != 0 || 202 (r = sshbuf_get_bignum1(msg, NULL)) != 0 || 203 /* host key */ 204 (r = sshbuf_get_u32(msg, NULL)) != 0 || 205 (r = sshbuf_get_bignum1(msg, rsa->rsa->e)) != 0 || 206 (r = sshbuf_get_bignum1(msg, rsa->rsa->n)) != 0) { 207 buf_err: 208 error("%s: buffer error: %s", __func__, ssh_err(r)); 209 sshbuf_reset(msg); 210 return NULL; 211 } 212 213 sshbuf_reset(msg); 214 215 return (rsa); 216 } 217 #endif 218 219 static int 220 key_print_wrapper(struct sshkey *hostkey, struct ssh *ssh) 221 { 222 con *c; 223 224 if ((c = ssh_get_app_data(ssh)) != NULL) 225 keyprint(c, hostkey); 226 /* always abort key exchange */ 227 return -1; 228 } 229 230 static int 231 ssh2_capable(int remote_major, int remote_minor) 232 { 233 switch (remote_major) { 234 case 1: 235 if (remote_minor == 99) 236 return 1; 237 break; 238 case 2: 239 return 1; 240 default: 241 break; 242 } 243 return 0; 244 } 245 246 static void 247 keygrab_ssh2(con *c) 248 { 249 char *myproposal[PROPOSAL_MAX] = { KEX_CLIENT }; 250 int r; 251 252 enable_compat20(); 253 switch (c->c_keytype) { 254 case KT_DSA: 255 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ? 256 "ssh-dss-cert-v01@openssh.com" : "ssh-dss"; 257 break; 258 case KT_RSA: 259 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ? 260 "ssh-rsa-cert-v01@openssh.com" : "ssh-rsa"; 261 break; 262 case KT_ED25519: 263 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ? 264 "ssh-ed25519-cert-v01@openssh.com" : "ssh-ed25519"; 265 break; 266 case KT_ECDSA: 267 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ? 268 "ecdsa-sha2-nistp256-cert-v01@openssh.com," 269 "ecdsa-sha2-nistp384-cert-v01@openssh.com," 270 "ecdsa-sha2-nistp521-cert-v01@openssh.com" : 271 "ecdsa-sha2-nistp256," 272 "ecdsa-sha2-nistp384," 273 "ecdsa-sha2-nistp521"; 274 break; 275 default: 276 fatal("unknown key type %d", c->c_keytype); 277 break; 278 } 279 if ((r = kex_setup(c->c_ssh, myproposal)) != 0) { 280 free(c->c_ssh); 281 fprintf(stderr, "kex_setup: %s\n", ssh_err(r)); 282 exit(1); 283 } 284 #ifdef WITH_OPENSSL 285 c->c_ssh->kex->kex[KEX_DH_GRP1_SHA1] = kexdh_client; 286 c->c_ssh->kex->kex[KEX_DH_GRP14_SHA1] = kexdh_client; 287 c->c_ssh->kex->kex[KEX_DH_GRP14_SHA256] = kexdh_client; 288 c->c_ssh->kex->kex[KEX_DH_GRP16_SHA512] = kexdh_client; 289 c->c_ssh->kex->kex[KEX_DH_GRP18_SHA512] = kexdh_client; 290 c->c_ssh->kex->kex[KEX_DH_GEX_SHA1] = kexgex_client; 291 c->c_ssh->kex->kex[KEX_DH_GEX_SHA256] = kexgex_client; 292 c->c_ssh->kex->kex[KEX_ECDH_SHA2] = kexecdh_client; 293 #endif 294 c->c_ssh->kex->kex[KEX_C25519_SHA256] = kexc25519_client; 295 ssh_set_verify_host_key_callback(c->c_ssh, key_print_wrapper); 296 /* 297 * do the key-exchange until an error occurs or until 298 * the key_print_wrapper() callback sets c_done. 299 */ 300 ssh_dispatch_run(c->c_ssh, DISPATCH_BLOCK, &c->c_done, c->c_ssh); 301 } 302 303 static void 304 keyprint_one(char *host, struct sshkey *key) 305 { 306 char *hostport; 307 308 if (hash_hosts && (host = host_hash(host, NULL, 0)) == NULL) 309 fatal("host_hash failed"); 310 311 hostport = put_host_port(host, ssh_port); 312 if (!get_cert) 313 fprintf(stdout, "%s ", hostport); 314 sshkey_write(key, stdout); 315 fputs("\n", stdout); 316 free(hostport); 317 } 318 319 static void 320 keyprint(con *c, struct sshkey *key) 321 { 322 char *hosts = c->c_output_name ? c->c_output_name : c->c_name; 323 char *host, *ohosts; 324 325 if (key == NULL) 326 return; 327 if (get_cert || (!hash_hosts && ssh_port == SSH_DEFAULT_PORT)) { 328 keyprint_one(hosts, key); 329 return; 330 } 331 ohosts = hosts = xstrdup(hosts); 332 while ((host = strsep(&hosts, ",")) != NULL) 333 keyprint_one(host, key); 334 free(ohosts); 335 } 336 337 static int 338 tcpconnect(char *host) 339 { 340 struct addrinfo hints, *ai, *aitop; 341 char strport[NI_MAXSERV]; 342 int gaierr, s = -1; 343 344 snprintf(strport, sizeof strport, "%d", ssh_port); 345 memset(&hints, 0, sizeof(hints)); 346 hints.ai_family = IPv4or6; 347 hints.ai_socktype = SOCK_STREAM; 348 if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) { 349 error("getaddrinfo %s: %s", host, ssh_gai_strerror(gaierr)); 350 return -1; 351 } 352 for (ai = aitop; ai; ai = ai->ai_next) { 353 s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); 354 if (s < 0) { 355 error("socket: %s", strerror(errno)); 356 continue; 357 } 358 if (set_nonblock(s) == -1) 359 fatal("%s: set_nonblock(%d)", __func__, s); 360 if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0 && 361 errno != EINPROGRESS) 362 error("connect (`%s'): %s", host, strerror(errno)); 363 else 364 break; 365 close(s); 366 s = -1; 367 } 368 freeaddrinfo(aitop); 369 return s; 370 } 371 372 static int 373 conalloc(char *iname, char *oname, int keytype) 374 { 375 char *namebase, *name, *namelist; 376 int s; 377 378 namebase = namelist = xstrdup(iname); 379 380 do { 381 name = xstrsep(&namelist, ","); 382 if (!name) { 383 free(namebase); 384 return (-1); 385 } 386 } while ((s = tcpconnect(name)) < 0); 387 388 if (s >= maxfd) 389 fatal("conalloc: fdno %d too high", s); 390 if (fdcon[s].c_status) 391 fatal("conalloc: attempt to reuse fdno %d", s); 392 393 debug3("%s: oname %s kt %d", __func__, oname, keytype); 394 fdcon[s].c_fd = s; 395 fdcon[s].c_status = CS_CON; 396 fdcon[s].c_namebase = namebase; 397 fdcon[s].c_name = name; 398 fdcon[s].c_namelist = namelist; 399 fdcon[s].c_output_name = xstrdup(oname); 400 fdcon[s].c_data = (char *) &fdcon[s].c_plen; 401 fdcon[s].c_len = 4; 402 fdcon[s].c_off = 0; 403 fdcon[s].c_keytype = keytype; 404 gettimeofday(&fdcon[s].c_tv, NULL); 405 fdcon[s].c_tv.tv_sec += timeout; 406 TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link); 407 FD_SET(s, read_wait); 408 ncon++; 409 return (s); 410 } 411 412 static void 413 confree(int s) 414 { 415 if (s >= maxfd || fdcon[s].c_status == CS_UNUSED) 416 fatal("confree: attempt to free bad fdno %d", s); 417 close(s); 418 free(fdcon[s].c_namebase); 419 free(fdcon[s].c_output_name); 420 if (fdcon[s].c_status == CS_KEYS) 421 free(fdcon[s].c_data); 422 fdcon[s].c_status = CS_UNUSED; 423 fdcon[s].c_keytype = 0; 424 if (fdcon[s].c_ssh) { 425 ssh_packet_close(fdcon[s].c_ssh); 426 free(fdcon[s].c_ssh); 427 fdcon[s].c_ssh = NULL; 428 } 429 TAILQ_REMOVE(&tq, &fdcon[s], c_link); 430 FD_CLR(s, read_wait); 431 ncon--; 432 } 433 434 static void 435 contouch(int s) 436 { 437 TAILQ_REMOVE(&tq, &fdcon[s], c_link); 438 gettimeofday(&fdcon[s].c_tv, NULL); 439 fdcon[s].c_tv.tv_sec += timeout; 440 TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link); 441 } 442 443 static int 444 conrecycle(int s) 445 { 446 con *c = &fdcon[s]; 447 int ret; 448 449 ret = conalloc(c->c_namelist, c->c_output_name, c->c_keytype); 450 confree(s); 451 return (ret); 452 } 453 454 static void 455 congreet(int s) 456 { 457 int n = 0, remote_major = 0, remote_minor = 0; 458 char buf[256], *cp; 459 char remote_version[sizeof buf]; 460 size_t bufsiz; 461 con *c = &fdcon[s]; 462 463 for (;;) { 464 memset(buf, '\0', sizeof(buf)); 465 bufsiz = sizeof(buf); 466 cp = buf; 467 while (bufsiz-- && 468 (n = atomicio(read, s, cp, 1)) == 1 && *cp != '\n') { 469 if (*cp == '\r') 470 *cp = '\n'; 471 cp++; 472 } 473 if (n != 1 || strncmp(buf, "SSH-", 4) == 0) 474 break; 475 } 476 if (n == 0) { 477 switch (errno) { 478 case EPIPE: 479 error("%s: Connection closed by remote host", c->c_name); 480 break; 481 case ECONNREFUSED: 482 break; 483 default: 484 error("read (%s): %s", c->c_name, strerror(errno)); 485 break; 486 } 487 conrecycle(s); 488 return; 489 } 490 if (*cp != '\n' && *cp != '\r') { 491 error("%s: bad greeting", c->c_name); 492 confree(s); 493 return; 494 } 495 *cp = '\0'; 496 if ((c->c_ssh = ssh_packet_set_connection(NULL, s, s)) == NULL) 497 fatal("ssh_packet_set_connection failed"); 498 ssh_packet_set_timeout(c->c_ssh, timeout, 1); 499 ssh_set_app_data(c->c_ssh, c); /* back link */ 500 if (sscanf(buf, "SSH-%d.%d-%[^\n]\n", 501 &remote_major, &remote_minor, remote_version) == 3) 502 c->c_ssh->compat = compat_datafellows(remote_version); 503 else 504 c->c_ssh->compat = 0; 505 if (c->c_keytype != KT_RSA1) { 506 if (!ssh2_capable(remote_major, remote_minor)) { 507 debug("%s doesn't support ssh2", c->c_name); 508 confree(s); 509 return; 510 } 511 } else if (remote_major != 1) { 512 debug("%s doesn't support ssh1", c->c_name); 513 confree(s); 514 return; 515 } 516 fprintf(stderr, "# %s:%d %s\n", c->c_name, ssh_port, chop(buf)); 517 n = snprintf(buf, sizeof buf, "SSH-%d.%d-OpenSSH-keyscan\r\n", 518 c->c_keytype == KT_RSA1? PROTOCOL_MAJOR_1 : PROTOCOL_MAJOR_2, 519 c->c_keytype == KT_RSA1? PROTOCOL_MINOR_1 : PROTOCOL_MINOR_2); 520 if (n < 0 || (size_t)n >= sizeof(buf)) { 521 error("snprintf: buffer too small"); 522 confree(s); 523 return; 524 } 525 if (atomicio(vwrite, s, buf, n) != (size_t)n) { 526 error("write (%s): %s", c->c_name, strerror(errno)); 527 confree(s); 528 return; 529 } 530 if (c->c_keytype != KT_RSA1) { 531 keygrab_ssh2(c); 532 confree(s); 533 return; 534 } 535 c->c_status = CS_SIZE; 536 contouch(s); 537 } 538 539 static void 540 conread(int s) 541 { 542 con *c = &fdcon[s]; 543 size_t n; 544 545 if (c->c_status == CS_CON) { 546 congreet(s); 547 return; 548 } 549 n = atomicio(read, s, c->c_data + c->c_off, c->c_len - c->c_off); 550 if (n == 0) { 551 error("read (%s): %s", c->c_name, strerror(errno)); 552 confree(s); 553 return; 554 } 555 c->c_off += n; 556 557 if (c->c_off == c->c_len) 558 switch (c->c_status) { 559 case CS_SIZE: 560 c->c_plen = htonl(c->c_plen); 561 c->c_len = c->c_plen + 8 - (c->c_plen & 7); 562 c->c_off = 0; 563 c->c_data = xmalloc(c->c_len); 564 c->c_status = CS_KEYS; 565 break; 566 #ifdef WITH_SSH1 567 case CS_KEYS: 568 keyprint(c, keygrab_ssh1(c)); 569 confree(s); 570 return; 571 #endif 572 default: 573 fatal("conread: invalid status %d", c->c_status); 574 break; 575 } 576 577 contouch(s); 578 } 579 580 static void 581 conloop(void) 582 { 583 struct timeval seltime, now; 584 fd_set *r, *e; 585 con *c; 586 int i; 587 588 gettimeofday(&now, NULL); 589 c = TAILQ_FIRST(&tq); 590 591 if (c && (c->c_tv.tv_sec > now.tv_sec || 592 (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec > now.tv_usec))) { 593 seltime = c->c_tv; 594 seltime.tv_sec -= now.tv_sec; 595 seltime.tv_usec -= now.tv_usec; 596 if (seltime.tv_usec < 0) { 597 seltime.tv_usec += 1000000; 598 seltime.tv_sec--; 599 } 600 } else 601 timerclear(&seltime); 602 603 r = xcalloc(read_wait_nfdset, sizeof(fd_mask)); 604 e = xcalloc(read_wait_nfdset, sizeof(fd_mask)); 605 memcpy(r, read_wait, read_wait_nfdset * sizeof(fd_mask)); 606 memcpy(e, read_wait, read_wait_nfdset * sizeof(fd_mask)); 607 608 while (select(maxfd, r, NULL, e, &seltime) == -1 && 609 (errno == EAGAIN || errno == EINTR)) 610 ; 611 612 for (i = 0; i < maxfd; i++) { 613 if (FD_ISSET(i, e)) { 614 error("%s: exception!", fdcon[i].c_name); 615 confree(i); 616 } else if (FD_ISSET(i, r)) 617 conread(i); 618 } 619 free(r); 620 free(e); 621 622 c = TAILQ_FIRST(&tq); 623 while (c && (c->c_tv.tv_sec < now.tv_sec || 624 (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec < now.tv_usec))) { 625 int s = c->c_fd; 626 627 c = TAILQ_NEXT(c, c_link); 628 conrecycle(s); 629 } 630 } 631 632 static void 633 do_host(char *host) 634 { 635 char *name = strnnsep(&host, " \t\n"); 636 int j; 637 638 if (name == NULL) 639 return; 640 for (j = KT_RSA1; j <= KT_ED25519; j *= 2) { 641 if (get_keytypes & j) { 642 while (ncon >= MAXCON) 643 conloop(); 644 conalloc(name, *host ? host : name, j); 645 } 646 } 647 } 648 649 void 650 fatal(const char *fmt,...) 651 { 652 va_list args; 653 654 va_start(args, fmt); 655 do_log(SYSLOG_LEVEL_FATAL, fmt, args); 656 va_end(args); 657 exit(255); 658 } 659 660 static void 661 usage(void) 662 { 663 fprintf(stderr, 664 "usage: %s [-46cHv] [-f file] [-p port] [-T timeout] [-t type]\n" 665 "\t\t [host | addrlist namelist] ...\n", 666 __progname); 667 exit(1); 668 } 669 670 int 671 main(int argc, char **argv) 672 { 673 int debug_flag = 0, log_level = SYSLOG_LEVEL_INFO; 674 int opt, fopt_count = 0, j; 675 char *tname, *cp, line[NI_MAXHOST]; 676 FILE *fp; 677 u_long linenum; 678 679 extern int optind; 680 extern char *optarg; 681 682 ssh_malloc_init(); /* must be called before any mallocs */ 683 TAILQ_INIT(&tq); 684 685 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ 686 sanitise_stdfd(); 687 688 if (argc <= 1) 689 usage(); 690 691 while ((opt = getopt(argc, argv, "cHv46p:T:t:f:")) != -1) { 692 switch (opt) { 693 case 'H': 694 hash_hosts = 1; 695 break; 696 case 'c': 697 get_cert = 1; 698 break; 699 case 'p': 700 ssh_port = a2port(optarg); 701 if (ssh_port <= 0) { 702 fprintf(stderr, "Bad port '%s'\n", optarg); 703 exit(1); 704 } 705 break; 706 case 'T': 707 timeout = convtime(optarg); 708 if (timeout == -1 || timeout == 0) { 709 fprintf(stderr, "Bad timeout '%s'\n", optarg); 710 usage(); 711 } 712 break; 713 case 'v': 714 if (!debug_flag) { 715 debug_flag = 1; 716 log_level = SYSLOG_LEVEL_DEBUG1; 717 } 718 else if (log_level < SYSLOG_LEVEL_DEBUG3) 719 log_level++; 720 else 721 fatal("Too high debugging level."); 722 break; 723 case 'f': 724 if (strcmp(optarg, "-") == 0) 725 optarg = NULL; 726 argv[fopt_count++] = optarg; 727 break; 728 case 't': 729 get_keytypes = 0; 730 tname = strtok(optarg, ","); 731 while (tname) { 732 int type = sshkey_type_from_name(tname); 733 switch (type) { 734 case KEY_RSA1: 735 get_keytypes |= KT_RSA1; 736 break; 737 case KEY_DSA: 738 get_keytypes |= KT_DSA; 739 break; 740 case KEY_ECDSA: 741 get_keytypes |= KT_ECDSA; 742 break; 743 case KEY_RSA: 744 get_keytypes |= KT_RSA; 745 break; 746 case KEY_ED25519: 747 get_keytypes |= KT_ED25519; 748 break; 749 case KEY_UNSPEC: 750 fatal("unknown key type %s", tname); 751 } 752 tname = strtok(NULL, ","); 753 } 754 break; 755 case '4': 756 IPv4or6 = AF_INET; 757 break; 758 case '6': 759 IPv4or6 = AF_INET6; 760 break; 761 case '?': 762 default: 763 usage(); 764 } 765 } 766 if (optind == argc && !fopt_count) 767 usage(); 768 769 log_init("ssh-keyscan", log_level, SYSLOG_FACILITY_USER, 1); 770 771 maxfd = fdlim_get(1); 772 if (maxfd < 0) 773 fatal("%s: fdlim_get: bad value", __progname); 774 if (maxfd > MAXMAXFD) 775 maxfd = MAXMAXFD; 776 if (MAXCON <= 0) 777 fatal("%s: not enough file descriptors", __progname); 778 if (maxfd > fdlim_get(0)) 779 fdlim_set(maxfd); 780 fdcon = xcalloc(maxfd, sizeof(con)); 781 782 read_wait_nfdset = howmany(maxfd, NFDBITS); 783 read_wait = xcalloc(read_wait_nfdset, sizeof(fd_mask)); 784 785 for (j = 0; j < fopt_count; j++) { 786 if (argv[j] == NULL) 787 fp = stdin; 788 else if ((fp = fopen(argv[j], "r")) == NULL) 789 fatal("%s: %s: %s", __progname, argv[j], 790 strerror(errno)); 791 linenum = 0; 792 793 while (read_keyfile_line(fp, 794 argv[j] == NULL ? "(stdin)" : argv[j], line, sizeof(line), 795 &linenum) != -1) { 796 /* Chomp off trailing whitespace and comments */ 797 if ((cp = strchr(line, '#')) == NULL) 798 cp = line + strlen(line) - 1; 799 while (cp >= line) { 800 if (*cp == ' ' || *cp == '\t' || 801 *cp == '\n' || *cp == '#') 802 *cp-- = '\0'; 803 else 804 break; 805 } 806 807 /* Skip empty lines */ 808 if (*line == '\0') 809 continue; 810 811 do_host(line); 812 } 813 814 if (ferror(fp)) 815 fatal("%s: %s: %s", __progname, argv[j], 816 strerror(errno)); 817 818 fclose(fp); 819 } 820 821 while (optind < argc) 822 do_host(argv[optind++]); 823 824 while (ncon > 0) 825 conloop(); 826 827 return (0); 828 } 829