1 /* $OpenBSD: ssh-keyscan.c,v 1.158 2024/06/14 00:25:25 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 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 int r = 0; 294 295 found_one = 1; 296 297 if (print_sshfp) { 298 export_dns_rr(host, key, stdout, 0, hashalg); 299 return; 300 } 301 302 hostport = put_host_port(host, ssh_port); 303 lowercase(hostport); 304 if (hash_hosts && (hashed = host_hash(hostport, NULL, 0)) == NULL) 305 fatal("host_hash failed"); 306 known_host = hash_hosts ? hashed : hostport; 307 if (!get_cert) 308 r = fprintf(stdout, "%s ", known_host); 309 if (r >= 0 && sshkey_write(key, stdout) == 0) 310 (void)fputs("\n", stdout); 311 free(hashed); 312 free(hostport); 313 } 314 315 static void 316 keyprint(con *c, struct sshkey *key) 317 { 318 char *hosts = c->c_output_name ? c->c_output_name : c->c_name; 319 char *host, *ohosts; 320 321 if (key == NULL) 322 return; 323 if (get_cert || (!hash_hosts && ssh_port == SSH_DEFAULT_PORT)) { 324 keyprint_one(hosts, key); 325 return; 326 } 327 ohosts = hosts = xstrdup(hosts); 328 while ((host = strsep(&hosts, ",")) != NULL) 329 keyprint_one(host, key); 330 free(ohosts); 331 } 332 333 static int 334 tcpconnect(char *host) 335 { 336 struct addrinfo hints, *ai, *aitop; 337 char strport[NI_MAXSERV]; 338 int gaierr, s = -1; 339 340 snprintf(strport, sizeof strport, "%d", ssh_port); 341 memset(&hints, 0, sizeof(hints)); 342 hints.ai_family = IPv4or6; 343 hints.ai_socktype = SOCK_STREAM; 344 if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) { 345 error("getaddrinfo %s: %s", host, ssh_gai_strerror(gaierr)); 346 return -1; 347 } 348 for (ai = aitop; ai; ai = ai->ai_next) { 349 s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); 350 if (s == -1) { 351 error("socket: %s", strerror(errno)); 352 continue; 353 } 354 if (set_nonblock(s) == -1) 355 fatal_f("set_nonblock(%d)", s); 356 if (connect(s, ai->ai_addr, ai->ai_addrlen) == -1 && 357 errno != EINPROGRESS) 358 error("connect (`%s'): %s", host, strerror(errno)); 359 else 360 break; 361 close(s); 362 s = -1; 363 } 364 freeaddrinfo(aitop); 365 return s; 366 } 367 368 static int 369 conalloc(const char *iname, const char *oname, int keytype) 370 { 371 char *namebase, *name, *namelist; 372 int s; 373 374 namebase = namelist = xstrdup(iname); 375 376 do { 377 name = xstrsep(&namelist, ","); 378 if (!name) { 379 free(namebase); 380 return (-1); 381 } 382 } while ((s = tcpconnect(name)) < 0); 383 384 if (s >= maxfd) 385 fatal("conalloc: fdno %d too high", s); 386 if (fdcon[s].c_status) 387 fatal("conalloc: attempt to reuse fdno %d", s); 388 389 debug3_f("oname %s kt %d", oname, keytype); 390 fdcon[s].c_fd = s; 391 fdcon[s].c_status = CS_CON; 392 fdcon[s].c_namebase = namebase; 393 fdcon[s].c_name = name; 394 fdcon[s].c_namelist = namelist; 395 fdcon[s].c_output_name = xstrdup(oname); 396 fdcon[s].c_keytype = keytype; 397 monotime_ts(&fdcon[s].c_ts); 398 fdcon[s].c_ts.tv_sec += timeout; 399 TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link); 400 read_wait[s].fd = s; 401 read_wait[s].events = POLLIN; 402 ncon++; 403 return (s); 404 } 405 406 static void 407 confree(int s) 408 { 409 if (s >= maxfd || fdcon[s].c_status == CS_UNUSED) 410 fatal("confree: attempt to free bad fdno %d", s); 411 free(fdcon[s].c_namebase); 412 free(fdcon[s].c_output_name); 413 fdcon[s].c_status = CS_UNUSED; 414 fdcon[s].c_keytype = 0; 415 if (fdcon[s].c_ssh) { 416 ssh_packet_close(fdcon[s].c_ssh); 417 free(fdcon[s].c_ssh); 418 fdcon[s].c_ssh = NULL; 419 } else 420 close(s); 421 TAILQ_REMOVE(&tq, &fdcon[s], c_link); 422 read_wait[s].fd = -1; 423 read_wait[s].events = 0; 424 ncon--; 425 } 426 427 static int 428 conrecycle(int s) 429 { 430 con *c = &fdcon[s]; 431 int ret; 432 433 ret = conalloc(c->c_namelist, c->c_output_name, c->c_keytype); 434 confree(s); 435 return (ret); 436 } 437 438 static void 439 congreet(int s) 440 { 441 int n = 0, remote_major = 0, remote_minor = 0; 442 char buf[256], *cp; 443 char remote_version[sizeof buf]; 444 size_t bufsiz; 445 con *c = &fdcon[s]; 446 447 /* send client banner */ 448 n = snprintf(buf, sizeof buf, "SSH-%d.%d-OpenSSH-keyscan\r\n", 449 PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2); 450 if (n < 0 || (size_t)n >= sizeof(buf)) { 451 error("snprintf: buffer too small"); 452 confree(s); 453 return; 454 } 455 if (atomicio(vwrite, s, buf, n) != (size_t)n) { 456 error("write (%s): %s", c->c_name, strerror(errno)); 457 confree(s); 458 return; 459 } 460 461 /* 462 * Read the server banner as per RFC4253 section 4.2. The "SSH-" 463 * protocol identification string may be preceded by an arbitrarily 464 * large banner which we must read and ignore. Loop while reading 465 * newline-terminated lines until we have one starting with "SSH-". 466 * The ID string cannot be longer than 255 characters although the 467 * preceding banner lines may (in which case they'll be discarded 468 * in multiple iterations of the outer loop). 469 */ 470 for (;;) { 471 memset(buf, '\0', sizeof(buf)); 472 bufsiz = sizeof(buf); 473 cp = buf; 474 while (bufsiz-- && 475 (n = atomicio(read, s, cp, 1)) == 1 && *cp != '\n') { 476 if (*cp == '\r') 477 *cp = '\n'; 478 cp++; 479 } 480 if (n != 1 || strncmp(buf, "SSH-", 4) == 0) 481 break; 482 } 483 if (n == 0) { 484 switch (errno) { 485 case EPIPE: 486 error("%s: Connection closed by remote host", c->c_name); 487 break; 488 case ECONNREFUSED: 489 break; 490 default: 491 error("read (%s): %s", c->c_name, strerror(errno)); 492 break; 493 } 494 conrecycle(s); 495 return; 496 } 497 if (cp >= buf + sizeof(buf)) { 498 error("%s: greeting exceeds allowable length", c->c_name); 499 confree(s); 500 return; 501 } 502 if (*cp != '\n' && *cp != '\r') { 503 error("%s: bad greeting", c->c_name); 504 confree(s); 505 return; 506 } 507 *cp = '\0'; 508 if ((c->c_ssh = ssh_packet_set_connection(NULL, s, s)) == NULL) 509 fatal("ssh_packet_set_connection failed"); 510 ssh_packet_set_timeout(c->c_ssh, timeout, 1); 511 ssh_set_app_data(c->c_ssh, c); /* back link */ 512 c->c_ssh->compat = 0; 513 if (sscanf(buf, "SSH-%d.%d-%[^\n]\n", 514 &remote_major, &remote_minor, remote_version) == 3) 515 compat_banner(c->c_ssh, remote_version); 516 if (!ssh2_capable(remote_major, remote_minor)) { 517 debug("%s doesn't support ssh2", c->c_name); 518 confree(s); 519 return; 520 } 521 if (!quiet) { 522 fprintf(stdout, "%c %s:%d %s\n", print_sshfp ? ';' : '#', 523 c->c_name, ssh_port, chop(buf)); 524 } 525 keygrab_ssh2(c); 526 confree(s); 527 } 528 529 static void 530 conread(int s) 531 { 532 con *c = &fdcon[s]; 533 534 if (c->c_status != CS_CON) 535 fatal("conread: invalid status %d", c->c_status); 536 537 congreet(s); 538 } 539 540 static void 541 conloop(void) 542 { 543 struct timespec seltime, now; 544 con *c; 545 int i; 546 547 monotime_ts(&now); 548 c = TAILQ_FIRST(&tq); 549 550 if (c && timespeccmp(&c->c_ts, &now, >)) 551 timespecsub(&c->c_ts, &now, &seltime); 552 else 553 timespecclear(&seltime); 554 555 while (ppoll(read_wait, maxfd, &seltime, NULL) == -1) { 556 if (errno == EAGAIN || errno == EINTR) 557 continue; 558 error("poll error"); 559 } 560 561 for (i = 0; i < maxfd; i++) { 562 if (read_wait[i].revents & (POLLHUP|POLLERR|POLLNVAL)) 563 confree(i); 564 else if (read_wait[i].revents & (POLLIN|POLLHUP)) 565 conread(i); 566 } 567 568 c = TAILQ_FIRST(&tq); 569 while (c && timespeccmp(&c->c_ts, &now, <)) { 570 int s = c->c_fd; 571 572 c = TAILQ_NEXT(c, c_link); 573 conrecycle(s); 574 } 575 } 576 577 static void 578 do_one_host(char *host) 579 { 580 char *name = strnnsep(&host, " \t\n"); 581 int j; 582 583 if (name == NULL) 584 return; 585 for (j = KT_MIN; j <= KT_MAX; j *= 2) { 586 if (get_keytypes & j) { 587 while (ncon >= MAXCON) 588 conloop(); 589 conalloc(name, *host ? host : name, j); 590 } 591 } 592 } 593 594 static void 595 do_host(char *host) 596 { 597 char daddr[128]; 598 struct xaddr addr, end_addr; 599 u_int masklen; 600 601 if (host == NULL) 602 return; 603 if (addr_pton_cidr(host, &addr, &masklen) != 0) { 604 /* Assume argument is a hostname */ 605 do_one_host(host); 606 } else { 607 /* Argument is a CIDR range */ 608 debug("CIDR range %s", host); 609 end_addr = addr; 610 if (addr_host_to_all1s(&end_addr, masklen) != 0) 611 goto badaddr; 612 /* 613 * Note: we deliberately include the all-zero/ones addresses. 614 */ 615 for (;;) { 616 if (addr_ntop(&addr, daddr, sizeof(daddr)) != 0) { 617 badaddr: 618 error("Invalid address %s", host); 619 return; 620 } 621 debug("CIDR expand: address %s", daddr); 622 do_one_host(daddr); 623 if (addr_cmp(&addr, &end_addr) == 0) 624 break; 625 addr_increment(&addr); 626 }; 627 } 628 } 629 630 void 631 sshfatal(const char *file, const char *func, int line, int showfunc, 632 LogLevel level, const char *suffix, const char *fmt, ...) 633 { 634 va_list args; 635 636 va_start(args, fmt); 637 sshlogv(file, func, line, showfunc, level, suffix, fmt, args); 638 va_end(args); 639 cleanup_exit(255); 640 } 641 642 static void 643 usage(void) 644 { 645 fprintf(stderr, 646 "usage: ssh-keyscan [-46cDHqv] [-f file] [-O option] [-p port] [-T timeout]\n" 647 " [-t type] [host | addrlist namelist]\n"); 648 exit(1); 649 } 650 651 int 652 main(int argc, char **argv) 653 { 654 int debug_flag = 0, log_level = SYSLOG_LEVEL_INFO; 655 int opt, fopt_count = 0, j; 656 char *tname, *cp, *line = NULL; 657 size_t linesize = 0; 658 FILE *fp; 659 660 extern int optind; 661 extern char *optarg; 662 663 TAILQ_INIT(&tq); 664 665 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ 666 sanitise_stdfd(); 667 668 if (argc <= 1) 669 usage(); 670 671 while ((opt = getopt(argc, argv, "cDHqv46O:p:T:t:f:")) != -1) { 672 switch (opt) { 673 case 'H': 674 hash_hosts = 1; 675 break; 676 case 'c': 677 get_cert = 1; 678 break; 679 case 'D': 680 print_sshfp = 1; 681 break; 682 case 'p': 683 ssh_port = a2port(optarg); 684 if (ssh_port <= 0) { 685 fprintf(stderr, "Bad port '%s'\n", optarg); 686 exit(1); 687 } 688 break; 689 case 'T': 690 timeout = convtime(optarg); 691 if (timeout == -1 || timeout == 0) { 692 fprintf(stderr, "Bad timeout '%s'\n", optarg); 693 usage(); 694 } 695 break; 696 case 'v': 697 if (!debug_flag) { 698 debug_flag = 1; 699 log_level = SYSLOG_LEVEL_DEBUG1; 700 } 701 else if (log_level < SYSLOG_LEVEL_DEBUG3) 702 log_level++; 703 else 704 fatal("Too high debugging level."); 705 break; 706 case 'q': 707 quiet = 1; 708 break; 709 case 'f': 710 if (strcmp(optarg, "-") == 0) 711 optarg = NULL; 712 argv[fopt_count++] = optarg; 713 break; 714 case 'O': 715 /* Maybe other misc options in the future too */ 716 if (strncmp(optarg, "hashalg=", 8) != 0) 717 fatal("Unsupported -O option"); 718 if ((hashalg = ssh_digest_alg_by_name( 719 optarg + 8)) == -1) 720 fatal("Unsupported hash algorithm"); 721 break; 722 case 't': 723 get_keytypes = 0; 724 tname = strtok(optarg, ","); 725 while (tname) { 726 int type = sshkey_type_from_name(tname); 727 728 switch (type) { 729 #ifdef WITH_DSA 730 case KEY_DSA: 731 get_keytypes |= KT_DSA; 732 break; 733 #endif 734 case KEY_ECDSA: 735 get_keytypes |= KT_ECDSA; 736 break; 737 case KEY_RSA: 738 get_keytypes |= KT_RSA; 739 break; 740 case KEY_ED25519: 741 get_keytypes |= KT_ED25519; 742 break; 743 case KEY_XMSS: 744 get_keytypes |= KT_XMSS; 745 break; 746 case KEY_ED25519_SK: 747 get_keytypes |= KT_ED25519_SK; 748 break; 749 case KEY_ECDSA_SK: 750 get_keytypes |= KT_ECDSA_SK; 751 break; 752 case KEY_UNSPEC: 753 default: 754 fatal("Unknown key type \"%s\"", tname); 755 } 756 tname = strtok(NULL, ","); 757 } 758 break; 759 case '4': 760 IPv4or6 = AF_INET; 761 break; 762 case '6': 763 IPv4or6 = AF_INET6; 764 break; 765 default: 766 usage(); 767 } 768 } 769 if (optind == argc && !fopt_count) 770 usage(); 771 772 log_init("ssh-keyscan", log_level, SYSLOG_FACILITY_USER, 1); 773 774 maxfd = fdlim_get(1); 775 if (maxfd < 0) 776 fatal("%s: fdlim_get: bad value", __progname); 777 if (maxfd > MAXMAXFD) 778 maxfd = MAXMAXFD; 779 if (MAXCON <= 0) 780 fatal("%s: not enough file descriptors", __progname); 781 if (maxfd > fdlim_get(0)) 782 fdlim_set(maxfd); 783 fdcon = xcalloc(maxfd, sizeof(con)); 784 read_wait = xcalloc(maxfd, sizeof(struct pollfd)); 785 for (j = 0; j < maxfd; j++) 786 read_wait[j].fd = -1; 787 788 for (j = 0; j < fopt_count; j++) { 789 if (argv[j] == NULL) 790 fp = stdin; 791 else if ((fp = fopen(argv[j], "r")) == NULL) 792 fatal("%s: %s: %s", __progname, 793 fp == stdin ? "<stdin>" : argv[j], strerror(errno)); 794 795 while (getline(&line, &linesize, fp) != -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, 816 fp == stdin ? "<stdin>" : argv[j], strerror(errno)); 817 818 if (fp != stdin) 819 fclose(fp); 820 } 821 free(line); 822 823 while (optind < argc) 824 do_host(argv[optind++]); 825 826 while (ncon > 0) 827 conloop(); 828 829 return found_one ? 0 : 1; 830 } 831