1 /* $OpenBSD: ssh-keyscan.c,v 1.165 2024/12/06 15:17:15 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 #ifdef WITH_OPENSSL 17 #include <openssl/bn.h> 18 #endif 19 20 #include <errno.h> 21 #include <limits.h> 22 #include <netdb.h> 23 #include <stdarg.h> 24 #include <stdio.h> 25 #include <stdlib.h> 26 #include <poll.h> 27 #include <signal.h> 28 #include <string.h> 29 #include <unistd.h> 30 31 #include "xmalloc.h" 32 #include "ssh.h" 33 #include "sshbuf.h" 34 #include "sshkey.h" 35 #include "cipher.h" 36 #include "digest.h" 37 #include "kex.h" 38 #include "compat.h" 39 #include "myproposal.h" 40 #include "packet.h" 41 #include "dispatch.h" 42 #include "log.h" 43 #include "atomicio.h" 44 #include "misc.h" 45 #include "hostfile.h" 46 #include "ssherr.h" 47 #include "ssh_api.h" 48 #include "dns.h" 49 #include "addr.h" 50 51 /* Flag indicating whether IPv4 or IPv6. This can be set on the command line. 52 Default value is AF_UNSPEC means both IPv4 and IPv6. */ 53 int IPv4or6 = AF_UNSPEC; 54 55 int ssh_port = SSH_DEFAULT_PORT; 56 57 #define KT_DSA (1) 58 #define KT_RSA (1<<1) 59 #define KT_ECDSA (1<<2) 60 #define KT_ED25519 (1<<3) 61 #define KT_XMSS (1<<4) 62 #define KT_ECDSA_SK (1<<5) 63 #define KT_ED25519_SK (1<<6) 64 65 #define KT_MIN KT_DSA 66 #define KT_MAX KT_ED25519_SK 67 68 int get_cert = 0; 69 int get_keytypes = KT_RSA|KT_ECDSA|KT_ED25519|KT_ECDSA_SK|KT_ED25519_SK; 70 71 int hash_hosts = 0; /* Hash hostname on output */ 72 73 int print_sshfp = 0; /* Print SSHFP records instead of known_hosts */ 74 75 int found_one = 0; /* Successfully found a key */ 76 77 int hashalg = -1; /* Hash for SSHFP records or -1 for all */ 78 79 int quiet = 0; /* Don't print key comment lines */ 80 81 #define MAXMAXFD 256 82 83 /* The number of seconds after which to give up on a TCP connection */ 84 int timeout = 5; 85 86 int maxfd; 87 #define MAXCON (maxfd - 10) 88 89 extern char *__progname; 90 struct pollfd *read_wait; 91 int ncon; 92 93 /* 94 * Keep a connection structure for each file descriptor. The state 95 * associated with file descriptor n is held in fdcon[n]. 96 */ 97 typedef struct Connection { 98 u_char c_status; /* State of connection on this file desc. */ 99 #define CS_UNUSED 0 /* File descriptor unused */ 100 #define CS_CON 1 /* Waiting to connect/read greeting */ 101 int c_fd; /* Quick lookup: c->c_fd == c - fdcon */ 102 int c_keytype; /* Only one of KT_* */ 103 sig_atomic_t c_done; /* SSH2 done */ 104 char *c_namebase; /* Address to free for c_name and c_namelist */ 105 char *c_name; /* Hostname of connection for errors */ 106 char *c_namelist; /* Pointer to other possible addresses */ 107 char *c_output_name; /* Hostname of connection for output */ 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 (hard ? rlfd.rlim_max : rlfd.rlim_cur) > INT_MAX) 127 return sysconf(_SC_OPEN_MAX); 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 c->c_ssh->kex->kex[KEX_KEM_MLKEM768X25519_SHA256] = kex_gen_client; 281 ssh_set_verify_host_key_callback(c->c_ssh, key_print_wrapper); 282 /* 283 * do the key-exchange until an error occurs or until 284 * the key_print_wrapper() callback sets c_done. 285 */ 286 ssh_dispatch_run(c->c_ssh, DISPATCH_BLOCK, &c->c_done); 287 } 288 289 static void 290 keyprint_one(const char *host, struct sshkey *key) 291 { 292 char *hostport = NULL, *hashed = NULL; 293 const char *known_host; 294 int r = 0; 295 296 found_one = 1; 297 298 if (print_sshfp) { 299 export_dns_rr(host, key, stdout, 0, hashalg); 300 return; 301 } 302 303 hostport = put_host_port(host, ssh_port); 304 lowercase(hostport); 305 if (hash_hosts && (hashed = host_hash(hostport, NULL, 0)) == NULL) 306 fatal("host_hash failed"); 307 known_host = hash_hosts ? hashed : hostport; 308 if (!get_cert) 309 r = fprintf(stdout, "%s ", known_host); 310 if (r >= 0 && sshkey_write(key, stdout) == 0) 311 (void)fputs("\n", stdout); 312 free(hashed); 313 free(hostport); 314 } 315 316 static void 317 keyprint(con *c, struct sshkey *key) 318 { 319 char *hosts = c->c_output_name ? c->c_output_name : c->c_name; 320 char *host, *ohosts; 321 322 if (key == NULL) 323 return; 324 if (get_cert || (!hash_hosts && ssh_port == SSH_DEFAULT_PORT)) { 325 keyprint_one(hosts, key); 326 return; 327 } 328 ohosts = hosts = xstrdup(hosts); 329 while ((host = strsep(&hosts, ",")) != NULL) 330 keyprint_one(host, key); 331 free(ohosts); 332 } 333 334 static int 335 tcpconnect(char *host) 336 { 337 struct addrinfo hints, *ai, *aitop; 338 char strport[NI_MAXSERV]; 339 int gaierr, s = -1; 340 341 snprintf(strport, sizeof strport, "%d", ssh_port); 342 memset(&hints, 0, sizeof(hints)); 343 hints.ai_family = IPv4or6; 344 hints.ai_socktype = SOCK_STREAM; 345 if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) { 346 error("getaddrinfo %s: %s", host, ssh_gai_strerror(gaierr)); 347 return -1; 348 } 349 for (ai = aitop; ai; ai = ai->ai_next) { 350 s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); 351 if (s == -1) { 352 error("socket: %s", strerror(errno)); 353 continue; 354 } 355 if (set_nonblock(s) == -1) 356 fatal_f("set_nonblock(%d)", s); 357 if (connect(s, ai->ai_addr, ai->ai_addrlen) == -1 && 358 errno != EINPROGRESS) 359 error("connect (`%s'): %s", host, strerror(errno)); 360 else 361 break; 362 close(s); 363 s = -1; 364 } 365 freeaddrinfo(aitop); 366 return s; 367 } 368 369 static int 370 conalloc(const char *iname, const char *oname, int keytype) 371 { 372 char *namebase, *name, *namelist; 373 int s; 374 375 namebase = namelist = xstrdup(iname); 376 377 do { 378 name = xstrsep(&namelist, ","); 379 if (!name) { 380 free(namebase); 381 return (-1); 382 } 383 } while ((s = tcpconnect(name)) < 0); 384 385 if (s >= maxfd) 386 fatal("conalloc: fdno %d too high", s); 387 if (fdcon[s].c_status) 388 fatal("conalloc: attempt to reuse fdno %d", s); 389 390 debug3_f("oname %s kt %d", oname, keytype); 391 fdcon[s].c_fd = s; 392 fdcon[s].c_status = CS_CON; 393 fdcon[s].c_namebase = namebase; 394 fdcon[s].c_name = name; 395 fdcon[s].c_namelist = namelist; 396 fdcon[s].c_output_name = xstrdup(oname); 397 fdcon[s].c_keytype = keytype; 398 monotime_ts(&fdcon[s].c_ts); 399 fdcon[s].c_ts.tv_sec += timeout; 400 TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link); 401 read_wait[s].fd = s; 402 read_wait[s].events = POLLIN; 403 ncon++; 404 return (s); 405 } 406 407 static void 408 confree(int s) 409 { 410 if (s >= maxfd || fdcon[s].c_status == CS_UNUSED) 411 fatal("confree: attempt to free bad fdno %d", s); 412 free(fdcon[s].c_namebase); 413 free(fdcon[s].c_output_name); 414 fdcon[s].c_status = CS_UNUSED; 415 fdcon[s].c_keytype = 0; 416 if (fdcon[s].c_ssh) { 417 ssh_packet_close(fdcon[s].c_ssh); 418 free(fdcon[s].c_ssh); 419 fdcon[s].c_ssh = NULL; 420 } else 421 close(s); 422 TAILQ_REMOVE(&tq, &fdcon[s], c_link); 423 read_wait[s].fd = -1; 424 read_wait[s].events = 0; 425 ncon--; 426 } 427 428 static int 429 conrecycle(int s) 430 { 431 con *c = &fdcon[s]; 432 int ret; 433 434 ret = conalloc(c->c_namelist, c->c_output_name, c->c_keytype); 435 confree(s); 436 return (ret); 437 } 438 439 static void 440 congreet(int s) 441 { 442 int n = 0, remote_major = 0, remote_minor = 0; 443 char buf[256], *cp; 444 char remote_version[sizeof buf]; 445 size_t bufsiz; 446 con *c = &fdcon[s]; 447 448 /* send client banner */ 449 n = snprintf(buf, sizeof buf, "SSH-%d.%d-OpenSSH-keyscan\r\n", 450 PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2); 451 if (n < 0 || (size_t)n >= sizeof(buf)) { 452 error("snprintf: buffer too small"); 453 confree(s); 454 return; 455 } 456 if (atomicio(vwrite, s, buf, n) != (size_t)n) { 457 error("write (%s): %s", c->c_name, strerror(errno)); 458 confree(s); 459 return; 460 } 461 462 /* 463 * Read the server banner as per RFC4253 section 4.2. The "SSH-" 464 * protocol identification string may be preceded by an arbitrarily 465 * large banner which we must read and ignore. Loop while reading 466 * newline-terminated lines until we have one starting with "SSH-". 467 * The ID string cannot be longer than 255 characters although the 468 * preceding banner lines may (in which case they'll be discarded 469 * in multiple iterations of the outer loop). 470 */ 471 for (;;) { 472 memset(buf, '\0', sizeof(buf)); 473 bufsiz = sizeof(buf); 474 cp = buf; 475 while (bufsiz-- && 476 (n = atomicio(read, s, cp, 1)) == 1 && *cp != '\n') { 477 if (*cp == '\r') 478 *cp = '\n'; 479 cp++; 480 } 481 if (n != 1 || strncmp(buf, "SSH-", 4) == 0) 482 break; 483 } 484 if (n == 0) { 485 switch (errno) { 486 case EPIPE: 487 error("%s: Connection closed by remote host", c->c_name); 488 break; 489 case ECONNREFUSED: 490 break; 491 default: 492 error("read (%s): %s", c->c_name, strerror(errno)); 493 break; 494 } 495 conrecycle(s); 496 return; 497 } 498 if (cp >= buf + sizeof(buf)) { 499 error("%s: greeting exceeds allowable length", c->c_name); 500 confree(s); 501 return; 502 } 503 if (*cp != '\n' && *cp != '\r') { 504 error("%s: bad greeting", c->c_name); 505 confree(s); 506 return; 507 } 508 *cp = '\0'; 509 if ((c->c_ssh = ssh_packet_set_connection(NULL, s, s)) == NULL) 510 fatal("ssh_packet_set_connection failed"); 511 ssh_packet_set_timeout(c->c_ssh, timeout, 1); 512 ssh_set_app_data(c->c_ssh, c); /* back link */ 513 c->c_ssh->compat = 0; 514 if (sscanf(buf, "SSH-%d.%d-%[^\n]\n", 515 &remote_major, &remote_minor, remote_version) == 3) 516 compat_banner(c->c_ssh, remote_version); 517 if (!ssh2_capable(remote_major, remote_minor)) { 518 debug("%s doesn't support ssh2", c->c_name); 519 confree(s); 520 return; 521 } 522 if (!quiet) { 523 fprintf(stdout, "%c %s:%d %s\n", print_sshfp ? ';' : '#', 524 c->c_name, ssh_port, chop(buf)); 525 } 526 keygrab_ssh2(c); 527 confree(s); 528 } 529 530 static void 531 conread(int s) 532 { 533 con *c = &fdcon[s]; 534 535 if (c->c_status != CS_CON) 536 fatal("conread: invalid status %d", c->c_status); 537 538 congreet(s); 539 } 540 541 static void 542 conloop(void) 543 { 544 struct timespec seltime, now; 545 con *c; 546 int i; 547 548 monotime_ts(&now); 549 c = TAILQ_FIRST(&tq); 550 551 if (c && timespeccmp(&c->c_ts, &now, >)) 552 timespecsub(&c->c_ts, &now, &seltime); 553 else 554 timespecclear(&seltime); 555 556 while (ppoll(read_wait, maxfd, &seltime, NULL) == -1) { 557 if (errno == EAGAIN || errno == EINTR) 558 continue; 559 error("poll error"); 560 } 561 562 for (i = 0; i < maxfd; i++) { 563 if (read_wait[i].revents & (POLLHUP|POLLERR|POLLNVAL)) 564 confree(i); 565 else if (read_wait[i].revents & (POLLIN)) 566 conread(i); 567 } 568 569 c = TAILQ_FIRST(&tq); 570 while (c && timespeccmp(&c->c_ts, &now, <)) { 571 int s = c->c_fd; 572 573 c = TAILQ_NEXT(c, c_link); 574 conrecycle(s); 575 } 576 } 577 578 static void 579 do_one_host(char *host) 580 { 581 char *name = strnnsep(&host, " \t\n"); 582 int j; 583 584 if (name == NULL) 585 return; 586 for (j = KT_MIN; j <= KT_MAX; j *= 2) { 587 if (get_keytypes & j) { 588 while (ncon >= MAXCON) 589 conloop(); 590 conalloc(name, *host ? host : name, j); 591 } 592 } 593 } 594 595 static void 596 do_host(char *host) 597 { 598 char daddr[128]; 599 struct xaddr addr, end_addr; 600 u_int masklen; 601 602 if (host == NULL) 603 return; 604 if (addr_pton_cidr(host, &addr, &masklen) != 0) { 605 /* Assume argument is a hostname */ 606 do_one_host(host); 607 } else { 608 /* Argument is a CIDR range */ 609 debug("CIDR range %s", host); 610 end_addr = addr; 611 if (addr_host_to_all1s(&end_addr, masklen) != 0) 612 goto badaddr; 613 /* 614 * Note: we deliberately include the all-zero/ones addresses. 615 */ 616 for (;;) { 617 if (addr_ntop(&addr, daddr, sizeof(daddr)) != 0) { 618 badaddr: 619 error("Invalid address %s", host); 620 return; 621 } 622 debug("CIDR expand: address %s", daddr); 623 do_one_host(daddr); 624 if (addr_cmp(&addr, &end_addr) == 0) 625 break; 626 addr_increment(&addr); 627 } 628 } 629 } 630 631 static void 632 usage(void) 633 { 634 fprintf(stderr, 635 "usage: ssh-keyscan [-46cDHqv] [-f file] [-O option] [-p port] [-T timeout]\n" 636 " [-t type] [host | addrlist namelist]\n"); 637 exit(1); 638 } 639 640 int 641 main(int argc, char **argv) 642 { 643 int debug_flag = 0, log_level = SYSLOG_LEVEL_INFO; 644 int opt, fopt_count = 0, j; 645 char *tname, *cp, *line = NULL; 646 size_t linesize = 0; 647 FILE *fp; 648 649 extern int optind; 650 extern char *optarg; 651 652 TAILQ_INIT(&tq); 653 654 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ 655 sanitise_stdfd(); 656 657 if (argc <= 1) 658 usage(); 659 660 while ((opt = getopt(argc, argv, "cDHqv46O:p:T:t:f:")) != -1) { 661 switch (opt) { 662 case 'H': 663 hash_hosts = 1; 664 break; 665 case 'c': 666 get_cert = 1; 667 break; 668 case 'D': 669 print_sshfp = 1; 670 break; 671 case 'p': 672 ssh_port = a2port(optarg); 673 if (ssh_port <= 0) { 674 fprintf(stderr, "Bad port '%s'\n", optarg); 675 exit(1); 676 } 677 break; 678 case 'T': 679 timeout = convtime(optarg); 680 if (timeout == -1 || timeout == 0) { 681 fprintf(stderr, "Bad timeout '%s'\n", optarg); 682 usage(); 683 } 684 break; 685 case 'v': 686 if (!debug_flag) { 687 debug_flag = 1; 688 log_level = SYSLOG_LEVEL_DEBUG1; 689 } 690 else if (log_level < SYSLOG_LEVEL_DEBUG3) 691 log_level++; 692 else 693 fatal("Too high debugging level."); 694 break; 695 case 'q': 696 quiet = 1; 697 break; 698 case 'f': 699 if (strcmp(optarg, "-") == 0) 700 optarg = NULL; 701 argv[fopt_count++] = optarg; 702 break; 703 case 'O': 704 /* Maybe other misc options in the future too */ 705 if (strncmp(optarg, "hashalg=", 8) != 0) 706 fatal("Unsupported -O option"); 707 if ((hashalg = ssh_digest_alg_by_name( 708 optarg + 8)) == -1) 709 fatal("Unsupported hash algorithm"); 710 break; 711 case 't': 712 get_keytypes = 0; 713 tname = strtok(optarg, ","); 714 while (tname) { 715 int type = sshkey_type_from_shortname(tname); 716 717 switch (type) { 718 #ifdef WITH_DSA 719 case KEY_DSA: 720 get_keytypes |= KT_DSA; 721 break; 722 #endif 723 case KEY_ECDSA: 724 get_keytypes |= KT_ECDSA; 725 break; 726 case KEY_RSA: 727 get_keytypes |= KT_RSA; 728 break; 729 case KEY_ED25519: 730 get_keytypes |= KT_ED25519; 731 break; 732 case KEY_XMSS: 733 get_keytypes |= KT_XMSS; 734 break; 735 case KEY_ED25519_SK: 736 get_keytypes |= KT_ED25519_SK; 737 break; 738 case KEY_ECDSA_SK: 739 get_keytypes |= KT_ECDSA_SK; 740 break; 741 case KEY_UNSPEC: 742 default: 743 fatal("Unknown key type \"%s\"", tname); 744 } 745 tname = strtok(NULL, ","); 746 } 747 break; 748 case '4': 749 IPv4or6 = AF_INET; 750 break; 751 case '6': 752 IPv4or6 = AF_INET6; 753 break; 754 default: 755 usage(); 756 } 757 } 758 if (optind == argc && !fopt_count) 759 usage(); 760 761 log_init("ssh-keyscan", log_level, SYSLOG_FACILITY_USER, 1); 762 763 maxfd = fdlim_get(1); 764 if (maxfd < 0) 765 fatal("%s: fdlim_get: bad value", __progname); 766 if (maxfd > MAXMAXFD) 767 maxfd = MAXMAXFD; 768 if (MAXCON <= 0) 769 fatal("%s: not enough file descriptors", __progname); 770 if (maxfd > fdlim_get(0)) 771 fdlim_set(maxfd); 772 fdcon = xcalloc(maxfd, sizeof(con)); 773 read_wait = xcalloc(maxfd, sizeof(struct pollfd)); 774 for (j = 0; j < maxfd; j++) 775 read_wait[j].fd = -1; 776 777 ssh_signal(SIGPIPE, SIG_IGN); 778 for (j = 0; j < fopt_count; j++) { 779 if (argv[j] == NULL) 780 fp = stdin; 781 else if ((fp = fopen(argv[j], "r")) == NULL) 782 fatal("%s: %s: %s", __progname, 783 fp == stdin ? "<stdin>" : argv[j], strerror(errno)); 784 785 while (getline(&line, &linesize, fp) != -1) { 786 /* Chomp off trailing whitespace and comments */ 787 if ((cp = strchr(line, '#')) == NULL) 788 cp = line + strlen(line) - 1; 789 while (cp >= line) { 790 if (*cp == ' ' || *cp == '\t' || 791 *cp == '\n' || *cp == '#') 792 *cp-- = '\0'; 793 else 794 break; 795 } 796 797 /* Skip empty lines */ 798 if (*line == '\0') 799 continue; 800 801 do_host(line); 802 } 803 804 if (ferror(fp)) 805 fatal("%s: %s: %s", __progname, 806 fp == stdin ? "<stdin>" : argv[j], strerror(errno)); 807 808 if (fp != stdin) 809 fclose(fp); 810 } 811 free(line); 812 813 while (optind < argc) 814 do_host(argv[optind++]); 815 816 while (ncon > 0) 817 conloop(); 818 819 return found_one ? 0 : 1; 820 } 821