1 /* $OpenBSD: ssh-keyscan.c,v 1.149 2022/12/26 19:16:03 jmc 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 #ifdef WITH_OPENSSL 17 #include <openssl/bn.h> 18 #endif 19 20 #include <errno.h> 21 #include <netdb.h> 22 #include <stdarg.h> 23 #include <stdio.h> 24 #include <stdlib.h> 25 #include <poll.h> 26 #include <signal.h> 27 #include <string.h> 28 #include <unistd.h> 29 30 #include "xmalloc.h" 31 #include "ssh.h" 32 #include "sshbuf.h" 33 #include "sshkey.h" 34 #include "cipher.h" 35 #include "kex.h" 36 #include "compat.h" 37 #include "myproposal.h" 38 #include "packet.h" 39 #include "dispatch.h" 40 #include "log.h" 41 #include "atomicio.h" 42 #include "misc.h" 43 #include "hostfile.h" 44 #include "ssherr.h" 45 #include "ssh_api.h" 46 #include "dns.h" 47 #include "addr.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_DSA (1) 56 #define KT_RSA (1<<1) 57 #define KT_ECDSA (1<<2) 58 #define KT_ED25519 (1<<3) 59 #define KT_XMSS (1<<4) 60 #define KT_ECDSA_SK (1<<5) 61 #define KT_ED25519_SK (1<<6) 62 63 #define KT_MIN KT_DSA 64 #define KT_MAX KT_ED25519_SK 65 66 int get_cert = 0; 67 int get_keytypes = KT_RSA|KT_ECDSA|KT_ED25519|KT_ECDSA_SK|KT_ED25519_SK; 68 69 int hash_hosts = 0; /* Hash hostname on output */ 70 71 int print_sshfp = 0; /* Print SSHFP records instead of known_hosts */ 72 73 int found_one = 0; /* Successfully found a key */ 74 75 #define MAXMAXFD 256 76 77 /* The number of seconds after which to give up on a TCP connection */ 78 int timeout = 5; 79 80 int maxfd; 81 #define MAXCON (maxfd - 10) 82 83 extern char *__progname; 84 struct pollfd *read_wait; 85 int ncon; 86 87 /* 88 * Keep a connection structure for each file descriptor. The state 89 * associated with file descriptor n is held in fdcon[n]. 90 */ 91 typedef struct Connection { 92 u_char c_status; /* State of connection on this file desc. */ 93 #define CS_UNUSED 0 /* File descriptor unused */ 94 #define CS_CON 1 /* Waiting to connect/read greeting */ 95 #define CS_SIZE 2 /* Waiting to read initial packet size */ 96 #define CS_KEYS 3 /* Waiting to read public key packet */ 97 int c_fd; /* Quick lookup: c->c_fd == c - fdcon */ 98 int c_plen; /* Packet length field for ssh packet */ 99 int c_len; /* Total bytes which must be read. */ 100 int c_off; /* Length of data read so far. */ 101 int c_keytype; /* Only one of KT_* */ 102 sig_atomic_t c_done; /* SSH2 done */ 103 char *c_namebase; /* Address to free for c_name and c_namelist */ 104 char *c_name; /* Hostname of connection for errors */ 105 char *c_namelist; /* Pointer to other possible addresses */ 106 char *c_output_name; /* Hostname of connection for output */ 107 char *c_data; /* Data read from this fd */ 108 struct ssh *c_ssh; /* SSH-connection */ 109 struct timespec c_ts; /* Time at which connection gets aborted */ 110 TAILQ_ENTRY(Connection) c_link; /* List of connections in timeout order. */ 111 } con; 112 113 TAILQ_HEAD(conlist, Connection) tq; /* Timeout Queue */ 114 con *fdcon; 115 116 static void keyprint(con *c, struct sshkey *key); 117 118 static int 119 fdlim_get(int hard) 120 { 121 struct rlimit rlfd; 122 123 if (getrlimit(RLIMIT_NOFILE, &rlfd) == -1) 124 return (-1); 125 if ((hard ? rlfd.rlim_max : rlfd.rlim_cur) == RLIM_INFINITY) 126 return sysconf(_SC_OPEN_MAX); 127 else 128 return hard ? rlfd.rlim_max : rlfd.rlim_cur; 129 } 130 131 static int 132 fdlim_set(int lim) 133 { 134 struct rlimit rlfd; 135 136 if (lim <= 0) 137 return (-1); 138 if (getrlimit(RLIMIT_NOFILE, &rlfd) == -1) 139 return (-1); 140 rlfd.rlim_cur = lim; 141 if (setrlimit(RLIMIT_NOFILE, &rlfd) == -1) 142 return (-1); 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 } 183 184 185 static int 186 key_print_wrapper(struct sshkey *hostkey, struct ssh *ssh) 187 { 188 con *c; 189 190 if ((c = ssh_get_app_data(ssh)) != NULL) 191 keyprint(c, hostkey); 192 /* always abort key exchange */ 193 return -1; 194 } 195 196 static int 197 ssh2_capable(int remote_major, int remote_minor) 198 { 199 switch (remote_major) { 200 case 1: 201 if (remote_minor == 99) 202 return 1; 203 break; 204 case 2: 205 return 1; 206 default: 207 break; 208 } 209 return 0; 210 } 211 212 static void 213 keygrab_ssh2(con *c) 214 { 215 char *myproposal[PROPOSAL_MAX] = { KEX_CLIENT }; 216 int r; 217 218 switch (c->c_keytype) { 219 case KT_DSA: 220 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ? 221 "ssh-dss-cert-v01@openssh.com" : "ssh-dss"; 222 break; 223 case KT_RSA: 224 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ? 225 "rsa-sha2-512-cert-v01@openssh.com," 226 "rsa-sha2-256-cert-v01@openssh.com," 227 "ssh-rsa-cert-v01@openssh.com" : 228 "rsa-sha2-512," 229 "rsa-sha2-256," 230 "ssh-rsa"; 231 break; 232 case KT_ED25519: 233 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ? 234 "ssh-ed25519-cert-v01@openssh.com" : "ssh-ed25519"; 235 break; 236 case KT_XMSS: 237 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ? 238 "ssh-xmss-cert-v01@openssh.com" : "ssh-xmss@openssh.com"; 239 break; 240 case KT_ECDSA: 241 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ? 242 "ecdsa-sha2-nistp256-cert-v01@openssh.com," 243 "ecdsa-sha2-nistp384-cert-v01@openssh.com," 244 "ecdsa-sha2-nistp521-cert-v01@openssh.com" : 245 "ecdsa-sha2-nistp256," 246 "ecdsa-sha2-nistp384," 247 "ecdsa-sha2-nistp521"; 248 break; 249 case KT_ECDSA_SK: 250 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ? 251 "sk-ecdsa-sha2-nistp256-cert-v01@openssh.com" : 252 "sk-ecdsa-sha2-nistp256@openssh.com"; 253 break; 254 case KT_ED25519_SK: 255 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ? 256 "sk-ssh-ed25519-cert-v01@openssh.com" : 257 "sk-ssh-ed25519@openssh.com"; 258 break; 259 default: 260 fatal("unknown key type %d", c->c_keytype); 261 break; 262 } 263 if ((r = kex_setup(c->c_ssh, myproposal)) != 0) { 264 free(c->c_ssh); 265 fprintf(stderr, "kex_setup: %s\n", ssh_err(r)); 266 exit(1); 267 } 268 #ifdef WITH_OPENSSL 269 c->c_ssh->kex->kex[KEX_DH_GRP1_SHA1] = kex_gen_client; 270 c->c_ssh->kex->kex[KEX_DH_GRP14_SHA1] = kex_gen_client; 271 c->c_ssh->kex->kex[KEX_DH_GRP14_SHA256] = kex_gen_client; 272 c->c_ssh->kex->kex[KEX_DH_GRP16_SHA512] = kex_gen_client; 273 c->c_ssh->kex->kex[KEX_DH_GRP18_SHA512] = kex_gen_client; 274 c->c_ssh->kex->kex[KEX_DH_GEX_SHA1] = kexgex_client; 275 c->c_ssh->kex->kex[KEX_DH_GEX_SHA256] = kexgex_client; 276 c->c_ssh->kex->kex[KEX_ECDH_SHA2] = kex_gen_client; 277 #endif 278 c->c_ssh->kex->kex[KEX_C25519_SHA256] = kex_gen_client; 279 c->c_ssh->kex->kex[KEX_KEM_SNTRUP761X25519_SHA512] = kex_gen_client; 280 ssh_set_verify_host_key_callback(c->c_ssh, key_print_wrapper); 281 /* 282 * do the key-exchange until an error occurs or until 283 * the key_print_wrapper() callback sets c_done. 284 */ 285 ssh_dispatch_run(c->c_ssh, DISPATCH_BLOCK, &c->c_done); 286 } 287 288 static void 289 keyprint_one(const char *host, struct sshkey *key) 290 { 291 char *hostport = NULL, *hashed = NULL; 292 const char *known_host; 293 294 found_one = 1; 295 296 if (print_sshfp) { 297 export_dns_rr(host, key, stdout, 0); 298 return; 299 } 300 301 hostport = put_host_port(host, ssh_port); 302 lowercase(hostport); 303 if (hash_hosts && (hashed = host_hash(hostport, NULL, 0)) == NULL) 304 fatal("host_hash failed"); 305 known_host = hash_hosts ? hashed : hostport; 306 if (!get_cert) 307 fprintf(stdout, "%s ", known_host); 308 sshkey_write(key, stdout); 309 fputs("\n", stdout); 310 free(hashed); 311 free(hostport); 312 } 313 314 static void 315 keyprint(con *c, struct sshkey *key) 316 { 317 char *hosts = c->c_output_name ? c->c_output_name : c->c_name; 318 char *host, *ohosts; 319 320 if (key == NULL) 321 return; 322 if (get_cert || (!hash_hosts && ssh_port == SSH_DEFAULT_PORT)) { 323 keyprint_one(hosts, key); 324 return; 325 } 326 ohosts = hosts = xstrdup(hosts); 327 while ((host = strsep(&hosts, ",")) != NULL) 328 keyprint_one(host, key); 329 free(ohosts); 330 } 331 332 static int 333 tcpconnect(char *host) 334 { 335 struct addrinfo hints, *ai, *aitop; 336 char strport[NI_MAXSERV]; 337 int gaierr, s = -1; 338 339 snprintf(strport, sizeof strport, "%d", ssh_port); 340 memset(&hints, 0, sizeof(hints)); 341 hints.ai_family = IPv4or6; 342 hints.ai_socktype = SOCK_STREAM; 343 if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) { 344 error("getaddrinfo %s: %s", host, ssh_gai_strerror(gaierr)); 345 return -1; 346 } 347 for (ai = aitop; ai; ai = ai->ai_next) { 348 s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); 349 if (s == -1) { 350 error("socket: %s", strerror(errno)); 351 continue; 352 } 353 if (set_nonblock(s) == -1) 354 fatal_f("set_nonblock(%d)", s); 355 if (connect(s, ai->ai_addr, ai->ai_addrlen) == -1 && 356 errno != EINPROGRESS) 357 error("connect (`%s'): %s", host, strerror(errno)); 358 else 359 break; 360 close(s); 361 s = -1; 362 } 363 freeaddrinfo(aitop); 364 return s; 365 } 366 367 static int 368 conalloc(const char *iname, const char *oname, int keytype) 369 { 370 char *namebase, *name, *namelist; 371 int s; 372 373 namebase = namelist = xstrdup(iname); 374 375 do { 376 name = xstrsep(&namelist, ","); 377 if (!name) { 378 free(namebase); 379 return (-1); 380 } 381 } while ((s = tcpconnect(name)) < 0); 382 383 if (s >= maxfd) 384 fatal("conalloc: fdno %d too high", s); 385 if (fdcon[s].c_status) 386 fatal("conalloc: attempt to reuse fdno %d", s); 387 388 debug3_f("oname %s kt %d", oname, keytype); 389 fdcon[s].c_fd = s; 390 fdcon[s].c_status = CS_CON; 391 fdcon[s].c_namebase = namebase; 392 fdcon[s].c_name = name; 393 fdcon[s].c_namelist = namelist; 394 fdcon[s].c_output_name = xstrdup(oname); 395 fdcon[s].c_data = (char *) &fdcon[s].c_plen; 396 fdcon[s].c_len = 4; 397 fdcon[s].c_off = 0; 398 fdcon[s].c_keytype = keytype; 399 monotime_ts(&fdcon[s].c_ts); 400 fdcon[s].c_ts.tv_sec += timeout; 401 TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link); 402 read_wait[s].fd = s; 403 read_wait[s].events = POLLIN; 404 ncon++; 405 return (s); 406 } 407 408 static void 409 confree(int s) 410 { 411 if (s >= maxfd || fdcon[s].c_status == CS_UNUSED) 412 fatal("confree: attempt to free bad fdno %d", s); 413 free(fdcon[s].c_namebase); 414 free(fdcon[s].c_output_name); 415 if (fdcon[s].c_status == CS_KEYS) 416 free(fdcon[s].c_data); 417 fdcon[s].c_status = CS_UNUSED; 418 fdcon[s].c_keytype = 0; 419 if (fdcon[s].c_ssh) { 420 ssh_packet_close(fdcon[s].c_ssh); 421 free(fdcon[s].c_ssh); 422 fdcon[s].c_ssh = NULL; 423 } else 424 close(s); 425 TAILQ_REMOVE(&tq, &fdcon[s], c_link); 426 read_wait[s].fd = -1; 427 read_wait[s].events = 0; 428 ncon--; 429 } 430 431 static void 432 contouch(int s) 433 { 434 TAILQ_REMOVE(&tq, &fdcon[s], c_link); 435 monotime_ts(&fdcon[s].c_ts); 436 fdcon[s].c_ts.tv_sec += timeout; 437 TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link); 438 } 439 440 static int 441 conrecycle(int s) 442 { 443 con *c = &fdcon[s]; 444 int ret; 445 446 ret = conalloc(c->c_namelist, c->c_output_name, c->c_keytype); 447 confree(s); 448 return (ret); 449 } 450 451 static void 452 congreet(int s) 453 { 454 int n = 0, remote_major = 0, remote_minor = 0; 455 char buf[256], *cp; 456 char remote_version[sizeof buf]; 457 size_t bufsiz; 458 con *c = &fdcon[s]; 459 460 /* send client banner */ 461 n = snprintf(buf, sizeof buf, "SSH-%d.%d-OpenSSH-keyscan\r\n", 462 PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2); 463 if (n < 0 || (size_t)n >= sizeof(buf)) { 464 error("snprintf: buffer too small"); 465 confree(s); 466 return; 467 } 468 if (atomicio(vwrite, s, buf, n) != (size_t)n) { 469 error("write (%s): %s", c->c_name, strerror(errno)); 470 confree(s); 471 return; 472 } 473 474 /* 475 * Read the server banner as per RFC4253 section 4.2. The "SSH-" 476 * protocol identification string may be preceeded by an arbitrarily 477 * large banner which we must read and ignore. Loop while reading 478 * newline-terminated lines until we have one starting with "SSH-". 479 * The ID string cannot be longer than 255 characters although the 480 * preceeding banner lines may (in which case they'll be discarded 481 * in multiple iterations of the outer loop). 482 */ 483 for (;;) { 484 memset(buf, '\0', sizeof(buf)); 485 bufsiz = sizeof(buf); 486 cp = buf; 487 while (bufsiz-- && 488 (n = atomicio(read, s, cp, 1)) == 1 && *cp != '\n') { 489 if (*cp == '\r') 490 *cp = '\n'; 491 cp++; 492 } 493 if (n != 1 || strncmp(buf, "SSH-", 4) == 0) 494 break; 495 } 496 if (n == 0) { 497 switch (errno) { 498 case EPIPE: 499 error("%s: Connection closed by remote host", c->c_name); 500 break; 501 case ECONNREFUSED: 502 break; 503 default: 504 error("read (%s): %s", c->c_name, strerror(errno)); 505 break; 506 } 507 conrecycle(s); 508 return; 509 } 510 if (cp >= buf + sizeof(buf)) { 511 error("%s: greeting exceeds allowable length", c->c_name); 512 confree(s); 513 return; 514 } 515 if (*cp != '\n' && *cp != '\r') { 516 error("%s: bad greeting", c->c_name); 517 confree(s); 518 return; 519 } 520 *cp = '\0'; 521 if ((c->c_ssh = ssh_packet_set_connection(NULL, s, s)) == NULL) 522 fatal("ssh_packet_set_connection failed"); 523 ssh_packet_set_timeout(c->c_ssh, timeout, 1); 524 ssh_set_app_data(c->c_ssh, c); /* back link */ 525 c->c_ssh->compat = 0; 526 if (sscanf(buf, "SSH-%d.%d-%[^\n]\n", 527 &remote_major, &remote_minor, remote_version) == 3) 528 compat_banner(c->c_ssh, remote_version); 529 if (!ssh2_capable(remote_major, remote_minor)) { 530 debug("%s doesn't support ssh2", c->c_name); 531 confree(s); 532 return; 533 } 534 fprintf(stderr, "%c %s:%d %s\n", print_sshfp ? ';' : '#', 535 c->c_name, ssh_port, chop(buf)); 536 keygrab_ssh2(c); 537 confree(s); 538 } 539 540 static void 541 conread(int s) 542 { 543 con *c = &fdcon[s]; 544 size_t n; 545 546 if (c->c_status == CS_CON) { 547 congreet(s); 548 return; 549 } 550 n = atomicio(read, s, c->c_data + c->c_off, c->c_len - c->c_off); 551 if (n == 0) { 552 error("read (%s): %s", c->c_name, strerror(errno)); 553 confree(s); 554 return; 555 } 556 c->c_off += n; 557 558 if (c->c_off == c->c_len) 559 switch (c->c_status) { 560 case CS_SIZE: 561 c->c_plen = htonl(c->c_plen); 562 c->c_len = c->c_plen + 8 - (c->c_plen & 7); 563 c->c_off = 0; 564 c->c_data = xmalloc(c->c_len); 565 c->c_status = CS_KEYS; 566 break; 567 default: 568 fatal("conread: invalid status %d", c->c_status); 569 break; 570 } 571 572 contouch(s); 573 } 574 575 static void 576 conloop(void) 577 { 578 struct timespec seltime, now; 579 con *c; 580 int i; 581 582 monotime_ts(&now); 583 c = TAILQ_FIRST(&tq); 584 585 if (c && timespeccmp(&c->c_ts, &now, >)) 586 timespecsub(&c->c_ts, &now, &seltime); 587 else 588 timespecclear(&seltime); 589 590 while (ppoll(read_wait, maxfd, &seltime, NULL) == -1) { 591 if (errno == EAGAIN || errno == EINTR) 592 continue; 593 error("poll error"); 594 } 595 596 for (i = 0; i < maxfd; i++) { 597 if (read_wait[i].revents & (POLLHUP|POLLERR|POLLNVAL)) 598 confree(i); 599 else if (read_wait[i].revents & (POLLIN|POLLHUP)) 600 conread(i); 601 } 602 603 c = TAILQ_FIRST(&tq); 604 while (c && timespeccmp(&c->c_ts, &now, <)) { 605 int s = c->c_fd; 606 607 c = TAILQ_NEXT(c, c_link); 608 conrecycle(s); 609 } 610 } 611 612 static void 613 do_one_host(char *host) 614 { 615 char *name = strnnsep(&host, " \t\n"); 616 int j; 617 618 if (name == NULL) 619 return; 620 for (j = KT_MIN; j <= KT_MAX; j *= 2) { 621 if (get_keytypes & j) { 622 while (ncon >= MAXCON) 623 conloop(); 624 conalloc(name, *host ? host : name, j); 625 } 626 } 627 } 628 629 static void 630 do_host(char *host) 631 { 632 char daddr[128]; 633 struct xaddr addr, end_addr; 634 u_int masklen; 635 636 if (host == NULL) 637 return; 638 if (addr_pton_cidr(host, &addr, &masklen) != 0) { 639 /* Assume argument is a hostname */ 640 do_one_host(host); 641 } else { 642 /* Argument is a CIDR range */ 643 debug("CIDR range %s", host); 644 end_addr = addr; 645 if (addr_host_to_all1s(&end_addr, masklen) != 0) 646 goto badaddr; 647 /* 648 * Note: we deliberately include the all-zero/ones addresses. 649 */ 650 for (;;) { 651 if (addr_ntop(&addr, daddr, sizeof(daddr)) != 0) { 652 badaddr: 653 error("Invalid address %s", host); 654 return; 655 } 656 debug("CIDR expand: address %s", daddr); 657 do_one_host(daddr); 658 if (addr_cmp(&addr, &end_addr) == 0) 659 break; 660 addr_increment(&addr); 661 }; 662 } 663 } 664 665 void 666 sshfatal(const char *file, const char *func, int line, int showfunc, 667 LogLevel level, const char *suffix, const char *fmt, ...) 668 { 669 va_list args; 670 671 va_start(args, fmt); 672 sshlogv(file, func, line, showfunc, level, suffix, fmt, args); 673 va_end(args); 674 cleanup_exit(255); 675 } 676 677 static void 678 usage(void) 679 { 680 fprintf(stderr, 681 "usage: %s [-46cDHv] [-f file] [-p port] [-T timeout] [-t type]\n" 682 "\t\t [host | addrlist namelist]\n", 683 __progname); 684 exit(1); 685 } 686 687 int 688 main(int argc, char **argv) 689 { 690 int debug_flag = 0, log_level = SYSLOG_LEVEL_INFO; 691 int opt, fopt_count = 0, j; 692 char *tname, *cp, *line = NULL; 693 size_t linesize = 0; 694 FILE *fp; 695 696 extern int optind; 697 extern char *optarg; 698 699 TAILQ_INIT(&tq); 700 701 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ 702 sanitise_stdfd(); 703 704 if (argc <= 1) 705 usage(); 706 707 while ((opt = getopt(argc, argv, "cDHv46p:T:t:f:")) != -1) { 708 switch (opt) { 709 case 'H': 710 hash_hosts = 1; 711 break; 712 case 'c': 713 get_cert = 1; 714 break; 715 case 'D': 716 print_sshfp = 1; 717 break; 718 case 'p': 719 ssh_port = a2port(optarg); 720 if (ssh_port <= 0) { 721 fprintf(stderr, "Bad port '%s'\n", optarg); 722 exit(1); 723 } 724 break; 725 case 'T': 726 timeout = convtime(optarg); 727 if (timeout == -1 || timeout == 0) { 728 fprintf(stderr, "Bad timeout '%s'\n", optarg); 729 usage(); 730 } 731 break; 732 case 'v': 733 if (!debug_flag) { 734 debug_flag = 1; 735 log_level = SYSLOG_LEVEL_DEBUG1; 736 } 737 else if (log_level < SYSLOG_LEVEL_DEBUG3) 738 log_level++; 739 else 740 fatal("Too high debugging level."); 741 break; 742 case 'f': 743 if (strcmp(optarg, "-") == 0) 744 optarg = NULL; 745 argv[fopt_count++] = optarg; 746 break; 747 case 't': 748 get_keytypes = 0; 749 tname = strtok(optarg, ","); 750 while (tname) { 751 int type = sshkey_type_from_name(tname); 752 753 switch (type) { 754 case KEY_DSA: 755 get_keytypes |= KT_DSA; 756 break; 757 case KEY_ECDSA: 758 get_keytypes |= KT_ECDSA; 759 break; 760 case KEY_RSA: 761 get_keytypes |= KT_RSA; 762 break; 763 case KEY_ED25519: 764 get_keytypes |= KT_ED25519; 765 break; 766 case KEY_XMSS: 767 get_keytypes |= KT_XMSS; 768 break; 769 case KEY_ED25519_SK: 770 get_keytypes |= KT_ED25519_SK; 771 break; 772 case KEY_ECDSA_SK: 773 get_keytypes |= KT_ECDSA_SK; 774 break; 775 case KEY_UNSPEC: 776 default: 777 fatal("Unknown key type \"%s\"", tname); 778 } 779 tname = strtok(NULL, ","); 780 } 781 break; 782 case '4': 783 IPv4or6 = AF_INET; 784 break; 785 case '6': 786 IPv4or6 = AF_INET6; 787 break; 788 default: 789 usage(); 790 } 791 } 792 if (optind == argc && !fopt_count) 793 usage(); 794 795 log_init("ssh-keyscan", log_level, SYSLOG_FACILITY_USER, 1); 796 797 maxfd = fdlim_get(1); 798 if (maxfd < 0) 799 fatal("%s: fdlim_get: bad value", __progname); 800 if (maxfd > MAXMAXFD) 801 maxfd = MAXMAXFD; 802 if (MAXCON <= 0) 803 fatal("%s: not enough file descriptors", __progname); 804 if (maxfd > fdlim_get(0)) 805 fdlim_set(maxfd); 806 fdcon = xcalloc(maxfd, sizeof(con)); 807 read_wait = xcalloc(maxfd, sizeof(struct pollfd)); 808 for (j = 0; j < maxfd; j++) 809 read_wait[j].fd = -1; 810 811 for (j = 0; j < fopt_count; j++) { 812 if (argv[j] == NULL) 813 fp = stdin; 814 else if ((fp = fopen(argv[j], "r")) == NULL) 815 fatal("%s: %s: %s", __progname, argv[j], strerror(errno)); 816 817 while (getline(&line, &linesize, fp) != -1) { 818 /* Chomp off trailing whitespace and comments */ 819 if ((cp = strchr(line, '#')) == NULL) 820 cp = line + strlen(line) - 1; 821 while (cp >= line) { 822 if (*cp == ' ' || *cp == '\t' || 823 *cp == '\n' || *cp == '#') 824 *cp-- = '\0'; 825 else 826 break; 827 } 828 829 /* Skip empty lines */ 830 if (*line == '\0') 831 continue; 832 833 do_host(line); 834 } 835 836 if (ferror(fp)) 837 fatal("%s: %s: %s", __progname, argv[j], strerror(errno)); 838 839 fclose(fp); 840 } 841 free(line); 842 843 while (optind < argc) 844 do_host(argv[optind++]); 845 846 while (ncon > 0) 847 conloop(); 848 849 return found_one ? 0 : 1; 850 } 851