1 /* $OpenBSD: ssh-keyscan.c,v 1.109 2017/03/10 04:26:06 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(const char *host, struct sshkey *key) 305 { 306 char *hostport; 307 const char *known_host, *hashed; 308 309 hostport = put_host_port(host, ssh_port); 310 lowercase(hostport); 311 if (hash_hosts && (hashed = host_hash(host, NULL, 0)) == NULL) 312 fatal("host_hash failed"); 313 known_host = hash_hosts ? hashed : hostport; 314 if (!get_cert) 315 fprintf(stdout, "%s ", known_host); 316 sshkey_write(key, stdout); 317 fputs("\n", stdout); 318 free(hostport); 319 } 320 321 static void 322 keyprint(con *c, struct sshkey *key) 323 { 324 char *hosts = c->c_output_name ? c->c_output_name : c->c_name; 325 char *host, *ohosts; 326 327 if (key == NULL) 328 return; 329 if (get_cert || (!hash_hosts && ssh_port == SSH_DEFAULT_PORT)) { 330 keyprint_one(hosts, key); 331 return; 332 } 333 ohosts = hosts = xstrdup(hosts); 334 while ((host = strsep(&hosts, ",")) != NULL) 335 keyprint_one(host, key); 336 free(ohosts); 337 } 338 339 static int 340 tcpconnect(char *host) 341 { 342 struct addrinfo hints, *ai, *aitop; 343 char strport[NI_MAXSERV]; 344 int gaierr, s = -1; 345 346 snprintf(strport, sizeof strport, "%d", ssh_port); 347 memset(&hints, 0, sizeof(hints)); 348 hints.ai_family = IPv4or6; 349 hints.ai_socktype = SOCK_STREAM; 350 if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) { 351 error("getaddrinfo %s: %s", host, ssh_gai_strerror(gaierr)); 352 return -1; 353 } 354 for (ai = aitop; ai; ai = ai->ai_next) { 355 s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); 356 if (s < 0) { 357 error("socket: %s", strerror(errno)); 358 continue; 359 } 360 if (set_nonblock(s) == -1) 361 fatal("%s: set_nonblock(%d)", __func__, s); 362 if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0 && 363 errno != EINPROGRESS) 364 error("connect (`%s'): %s", host, strerror(errno)); 365 else 366 break; 367 close(s); 368 s = -1; 369 } 370 freeaddrinfo(aitop); 371 return s; 372 } 373 374 static int 375 conalloc(char *iname, char *oname, int keytype) 376 { 377 char *namebase, *name, *namelist; 378 int s; 379 380 namebase = namelist = xstrdup(iname); 381 382 do { 383 name = xstrsep(&namelist, ","); 384 if (!name) { 385 free(namebase); 386 return (-1); 387 } 388 } while ((s = tcpconnect(name)) < 0); 389 390 if (s >= maxfd) 391 fatal("conalloc: fdno %d too high", s); 392 if (fdcon[s].c_status) 393 fatal("conalloc: attempt to reuse fdno %d", s); 394 395 debug3("%s: oname %s kt %d", __func__, oname, keytype); 396 fdcon[s].c_fd = s; 397 fdcon[s].c_status = CS_CON; 398 fdcon[s].c_namebase = namebase; 399 fdcon[s].c_name = name; 400 fdcon[s].c_namelist = namelist; 401 fdcon[s].c_output_name = xstrdup(oname); 402 fdcon[s].c_data = (char *) &fdcon[s].c_plen; 403 fdcon[s].c_len = 4; 404 fdcon[s].c_off = 0; 405 fdcon[s].c_keytype = keytype; 406 gettimeofday(&fdcon[s].c_tv, NULL); 407 fdcon[s].c_tv.tv_sec += timeout; 408 TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link); 409 FD_SET(s, read_wait); 410 ncon++; 411 return (s); 412 } 413 414 static void 415 confree(int s) 416 { 417 if (s >= maxfd || fdcon[s].c_status == CS_UNUSED) 418 fatal("confree: attempt to free bad fdno %d", s); 419 close(s); 420 free(fdcon[s].c_namebase); 421 free(fdcon[s].c_output_name); 422 if (fdcon[s].c_status == CS_KEYS) 423 free(fdcon[s].c_data); 424 fdcon[s].c_status = CS_UNUSED; 425 fdcon[s].c_keytype = 0; 426 if (fdcon[s].c_ssh) { 427 ssh_packet_close(fdcon[s].c_ssh); 428 free(fdcon[s].c_ssh); 429 fdcon[s].c_ssh = NULL; 430 } 431 TAILQ_REMOVE(&tq, &fdcon[s], c_link); 432 FD_CLR(s, read_wait); 433 ncon--; 434 } 435 436 static void 437 contouch(int s) 438 { 439 TAILQ_REMOVE(&tq, &fdcon[s], c_link); 440 gettimeofday(&fdcon[s].c_tv, NULL); 441 fdcon[s].c_tv.tv_sec += timeout; 442 TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link); 443 } 444 445 static int 446 conrecycle(int s) 447 { 448 con *c = &fdcon[s]; 449 int ret; 450 451 ret = conalloc(c->c_namelist, c->c_output_name, c->c_keytype); 452 confree(s); 453 return (ret); 454 } 455 456 static void 457 congreet(int s) 458 { 459 int n = 0, remote_major = 0, remote_minor = 0; 460 char buf[256], *cp; 461 char remote_version[sizeof buf]; 462 size_t bufsiz; 463 con *c = &fdcon[s]; 464 465 for (;;) { 466 memset(buf, '\0', sizeof(buf)); 467 bufsiz = sizeof(buf); 468 cp = buf; 469 while (bufsiz-- && 470 (n = atomicio(read, s, cp, 1)) == 1 && *cp != '\n') { 471 if (*cp == '\r') 472 *cp = '\n'; 473 cp++; 474 } 475 if (n != 1 || strncmp(buf, "SSH-", 4) == 0) 476 break; 477 } 478 if (n == 0) { 479 switch (errno) { 480 case EPIPE: 481 error("%s: Connection closed by remote host", c->c_name); 482 break; 483 case ECONNREFUSED: 484 break; 485 default: 486 error("read (%s): %s", c->c_name, strerror(errno)); 487 break; 488 } 489 conrecycle(s); 490 return; 491 } 492 if (*cp != '\n' && *cp != '\r') { 493 error("%s: bad greeting", c->c_name); 494 confree(s); 495 return; 496 } 497 *cp = '\0'; 498 if ((c->c_ssh = ssh_packet_set_connection(NULL, s, s)) == NULL) 499 fatal("ssh_packet_set_connection failed"); 500 ssh_packet_set_timeout(c->c_ssh, timeout, 1); 501 ssh_set_app_data(c->c_ssh, c); /* back link */ 502 if (sscanf(buf, "SSH-%d.%d-%[^\n]\n", 503 &remote_major, &remote_minor, remote_version) == 3) 504 c->c_ssh->compat = compat_datafellows(remote_version); 505 else 506 c->c_ssh->compat = 0; 507 if (c->c_keytype != KT_RSA1) { 508 if (!ssh2_capable(remote_major, remote_minor)) { 509 debug("%s doesn't support ssh2", c->c_name); 510 confree(s); 511 return; 512 } 513 } else if (remote_major != 1) { 514 debug("%s doesn't support ssh1", c->c_name); 515 confree(s); 516 return; 517 } 518 fprintf(stderr, "# %s:%d %s\n", c->c_name, ssh_port, chop(buf)); 519 n = snprintf(buf, sizeof buf, "SSH-%d.%d-OpenSSH-keyscan\r\n", 520 c->c_keytype == KT_RSA1? PROTOCOL_MAJOR_1 : PROTOCOL_MAJOR_2, 521 c->c_keytype == KT_RSA1? PROTOCOL_MINOR_1 : PROTOCOL_MINOR_2); 522 if (n < 0 || (size_t)n >= sizeof(buf)) { 523 error("snprintf: buffer too small"); 524 confree(s); 525 return; 526 } 527 if (atomicio(vwrite, s, buf, n) != (size_t)n) { 528 error("write (%s): %s", c->c_name, strerror(errno)); 529 confree(s); 530 return; 531 } 532 if (c->c_keytype != KT_RSA1) { 533 keygrab_ssh2(c); 534 confree(s); 535 return; 536 } 537 c->c_status = CS_SIZE; 538 contouch(s); 539 } 540 541 static void 542 conread(int s) 543 { 544 con *c = &fdcon[s]; 545 size_t n; 546 547 if (c->c_status == CS_CON) { 548 congreet(s); 549 return; 550 } 551 n = atomicio(read, s, c->c_data + c->c_off, c->c_len - c->c_off); 552 if (n == 0) { 553 error("read (%s): %s", c->c_name, strerror(errno)); 554 confree(s); 555 return; 556 } 557 c->c_off += n; 558 559 if (c->c_off == c->c_len) 560 switch (c->c_status) { 561 case CS_SIZE: 562 c->c_plen = htonl(c->c_plen); 563 c->c_len = c->c_plen + 8 - (c->c_plen & 7); 564 c->c_off = 0; 565 c->c_data = xmalloc(c->c_len); 566 c->c_status = CS_KEYS; 567 break; 568 #ifdef WITH_SSH1 569 case CS_KEYS: 570 keyprint(c, keygrab_ssh1(c)); 571 confree(s); 572 return; 573 #endif 574 default: 575 fatal("conread: invalid status %d", c->c_status); 576 break; 577 } 578 579 contouch(s); 580 } 581 582 static void 583 conloop(void) 584 { 585 struct timeval seltime, now; 586 fd_set *r, *e; 587 con *c; 588 int i; 589 590 gettimeofday(&now, NULL); 591 c = TAILQ_FIRST(&tq); 592 593 if (c && (c->c_tv.tv_sec > now.tv_sec || 594 (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec > now.tv_usec))) { 595 seltime = c->c_tv; 596 seltime.tv_sec -= now.tv_sec; 597 seltime.tv_usec -= now.tv_usec; 598 if (seltime.tv_usec < 0) { 599 seltime.tv_usec += 1000000; 600 seltime.tv_sec--; 601 } 602 } else 603 timerclear(&seltime); 604 605 r = xcalloc(read_wait_nfdset, sizeof(fd_mask)); 606 e = xcalloc(read_wait_nfdset, sizeof(fd_mask)); 607 memcpy(r, read_wait, read_wait_nfdset * sizeof(fd_mask)); 608 memcpy(e, read_wait, read_wait_nfdset * sizeof(fd_mask)); 609 610 while (select(maxfd, r, NULL, e, &seltime) == -1 && 611 (errno == EAGAIN || errno == EINTR)) 612 ; 613 614 for (i = 0; i < maxfd; i++) { 615 if (FD_ISSET(i, e)) { 616 error("%s: exception!", fdcon[i].c_name); 617 confree(i); 618 } else if (FD_ISSET(i, r)) 619 conread(i); 620 } 621 free(r); 622 free(e); 623 624 c = TAILQ_FIRST(&tq); 625 while (c && (c->c_tv.tv_sec < now.tv_sec || 626 (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec < now.tv_usec))) { 627 int s = c->c_fd; 628 629 c = TAILQ_NEXT(c, c_link); 630 conrecycle(s); 631 } 632 } 633 634 static void 635 do_host(char *host) 636 { 637 char *name = strnnsep(&host, " \t\n"); 638 int j; 639 640 if (name == NULL) 641 return; 642 for (j = KT_RSA1; j <= KT_ED25519; j *= 2) { 643 if (get_keytypes & j) { 644 while (ncon >= MAXCON) 645 conloop(); 646 conalloc(name, *host ? host : name, j); 647 } 648 } 649 } 650 651 void 652 fatal(const char *fmt,...) 653 { 654 va_list args; 655 656 va_start(args, fmt); 657 do_log(SYSLOG_LEVEL_FATAL, fmt, args); 658 va_end(args); 659 exit(255); 660 } 661 662 static void 663 usage(void) 664 { 665 fprintf(stderr, 666 "usage: %s [-46cHv] [-f file] [-p port] [-T timeout] [-t type]\n" 667 "\t\t [host | addrlist namelist] ...\n", 668 __progname); 669 exit(1); 670 } 671 672 int 673 main(int argc, char **argv) 674 { 675 int debug_flag = 0, log_level = SYSLOG_LEVEL_INFO; 676 int opt, fopt_count = 0, j; 677 char *tname, *cp, line[NI_MAXHOST]; 678 FILE *fp; 679 u_long linenum; 680 681 extern int optind; 682 extern char *optarg; 683 684 ssh_malloc_init(); /* must be called before any mallocs */ 685 TAILQ_INIT(&tq); 686 687 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ 688 sanitise_stdfd(); 689 690 if (argc <= 1) 691 usage(); 692 693 while ((opt = getopt(argc, argv, "cHv46p:T:t:f:")) != -1) { 694 switch (opt) { 695 case 'H': 696 hash_hosts = 1; 697 break; 698 case 'c': 699 get_cert = 1; 700 break; 701 case 'p': 702 ssh_port = a2port(optarg); 703 if (ssh_port <= 0) { 704 fprintf(stderr, "Bad port '%s'\n", optarg); 705 exit(1); 706 } 707 break; 708 case 'T': 709 timeout = convtime(optarg); 710 if (timeout == -1 || timeout == 0) { 711 fprintf(stderr, "Bad timeout '%s'\n", optarg); 712 usage(); 713 } 714 break; 715 case 'v': 716 if (!debug_flag) { 717 debug_flag = 1; 718 log_level = SYSLOG_LEVEL_DEBUG1; 719 } 720 else if (log_level < SYSLOG_LEVEL_DEBUG3) 721 log_level++; 722 else 723 fatal("Too high debugging level."); 724 break; 725 case 'f': 726 if (strcmp(optarg, "-") == 0) 727 optarg = NULL; 728 argv[fopt_count++] = optarg; 729 break; 730 case 't': 731 get_keytypes = 0; 732 tname = strtok(optarg, ","); 733 while (tname) { 734 int type = sshkey_type_from_name(tname); 735 736 switch (type) { 737 #ifdef WITH_SSH1 738 case KEY_RSA1: 739 get_keytypes |= KT_RSA1; 740 break; 741 #endif 742 case KEY_DSA: 743 get_keytypes |= KT_DSA; 744 break; 745 case KEY_ECDSA: 746 get_keytypes |= KT_ECDSA; 747 break; 748 case KEY_RSA: 749 get_keytypes |= KT_RSA; 750 break; 751 case KEY_ED25519: 752 get_keytypes |= KT_ED25519; 753 break; 754 case KEY_UNSPEC: 755 default: 756 fatal("Unknown key type \"%s\"", tname); 757 } 758 tname = strtok(NULL, ","); 759 } 760 break; 761 case '4': 762 IPv4or6 = AF_INET; 763 break; 764 case '6': 765 IPv4or6 = AF_INET6; 766 break; 767 case '?': 768 default: 769 usage(); 770 } 771 } 772 if (optind == argc && !fopt_count) 773 usage(); 774 775 log_init("ssh-keyscan", log_level, SYSLOG_FACILITY_USER, 1); 776 777 maxfd = fdlim_get(1); 778 if (maxfd < 0) 779 fatal("%s: fdlim_get: bad value", __progname); 780 if (maxfd > MAXMAXFD) 781 maxfd = MAXMAXFD; 782 if (MAXCON <= 0) 783 fatal("%s: not enough file descriptors", __progname); 784 if (maxfd > fdlim_get(0)) 785 fdlim_set(maxfd); 786 fdcon = xcalloc(maxfd, sizeof(con)); 787 788 read_wait_nfdset = howmany(maxfd, NFDBITS); 789 read_wait = xcalloc(read_wait_nfdset, sizeof(fd_mask)); 790 791 for (j = 0; j < fopt_count; j++) { 792 if (argv[j] == NULL) 793 fp = stdin; 794 else if ((fp = fopen(argv[j], "r")) == NULL) 795 fatal("%s: %s: %s", __progname, argv[j], 796 strerror(errno)); 797 linenum = 0; 798 799 while (read_keyfile_line(fp, 800 argv[j] == NULL ? "(stdin)" : argv[j], line, sizeof(line), 801 &linenum) != -1) { 802 /* Chomp off trailing whitespace and comments */ 803 if ((cp = strchr(line, '#')) == NULL) 804 cp = line + strlen(line) - 1; 805 while (cp >= line) { 806 if (*cp == ' ' || *cp == '\t' || 807 *cp == '\n' || *cp == '#') 808 *cp-- = '\0'; 809 else 810 break; 811 } 812 813 /* Skip empty lines */ 814 if (*line == '\0') 815 continue; 816 817 do_host(line); 818 } 819 820 if (ferror(fp)) 821 fatal("%s: %s: %s", __progname, argv[j], 822 strerror(errno)); 823 824 fclose(fp); 825 } 826 827 while (optind < argc) 828 do_host(argv[optind++]); 829 830 while (ncon > 0) 831 conloop(); 832 833 return (0); 834 } 835