1 /* $OpenBSD: ssh-keyscan.c,v 1.131 2019/12/15 19:47:10 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 <netdb.h> 22 #include <stdarg.h> 23 #include <stdio.h> 24 #include <stdlib.h> 25 #include <signal.h> 26 #include <string.h> 27 #include <unistd.h> 28 29 #include "xmalloc.h" 30 #include "ssh.h" 31 #include "sshbuf.h" 32 #include "sshkey.h" 33 #include "cipher.h" 34 #include "kex.h" 35 #include "compat.h" 36 #include "myproposal.h" 37 #include "packet.h" 38 #include "dispatch.h" 39 #include "log.h" 40 #include "atomicio.h" 41 #include "misc.h" 42 #include "hostfile.h" 43 #include "ssherr.h" 44 #include "ssh_api.h" 45 #include "dns.h" 46 47 /* Flag indicating whether IPv4 or IPv6. This can be set on the command line. 48 Default value is AF_UNSPEC means both IPv4 and IPv6. */ 49 int IPv4or6 = AF_UNSPEC; 50 51 int ssh_port = SSH_DEFAULT_PORT; 52 53 #define KT_DSA (1) 54 #define KT_RSA (1<<1) 55 #define KT_ECDSA (1<<2) 56 #define KT_ED25519 (1<<3) 57 #define KT_XMSS (1<<4) 58 #define KT_ECDSA_SK (1<<5) 59 #define KT_ED25519_SK (1<<6) 60 61 #define KT_MIN KT_DSA 62 #define KT_MAX KT_ED25519_SK 63 64 int get_cert = 0; 65 int get_keytypes = KT_RSA|KT_ECDSA|KT_ED25519|KT_ECDSA_SK|KT_ED25519_SK; 66 67 int hash_hosts = 0; /* Hash hostname on output */ 68 69 int print_sshfp = 0; /* Print SSHFP records instead of known_hosts */ 70 71 int found_one = 0; /* Successfully found a key */ 72 73 #define MAXMAXFD 256 74 75 /* The number of seconds after which to give up on a TCP connection */ 76 int timeout = 5; 77 78 int maxfd; 79 #define MAXCON (maxfd - 10) 80 81 extern char *__progname; 82 fd_set *read_wait; 83 size_t read_wait_nfdset; 84 int ncon; 85 86 /* 87 * Keep a connection structure for each file descriptor. The state 88 * associated with file descriptor n is held in fdcon[n]. 89 */ 90 typedef struct Connection { 91 u_char c_status; /* State of connection on this file desc. */ 92 #define CS_UNUSED 0 /* File descriptor unused */ 93 #define CS_CON 1 /* Waiting to connect/read greeting */ 94 #define CS_SIZE 2 /* Waiting to read initial packet size */ 95 #define CS_KEYS 3 /* Waiting to read public key packet */ 96 int c_fd; /* Quick lookup: c->c_fd == c - fdcon */ 97 int c_plen; /* Packet length field for ssh packet */ 98 int c_len; /* Total bytes which must be read. */ 99 int c_off; /* Length of data read so far. */ 100 int c_keytype; /* Only one of KT_* */ 101 sig_atomic_t c_done; /* SSH2 done */ 102 char *c_namebase; /* Address to free for c_name and c_namelist */ 103 char *c_name; /* Hostname of connection for errors */ 104 char *c_namelist; /* Pointer to other possible addresses */ 105 char *c_output_name; /* Hostname of connection for output */ 106 char *c_data; /* Data read from this fd */ 107 struct ssh *c_ssh; /* SSH-connection */ 108 struct timeval c_tv; /* Time at which connection gets aborted */ 109 TAILQ_ENTRY(Connection) c_link; /* List of connections in timeout order. */ 110 } con; 111 112 TAILQ_HEAD(conlist, Connection) tq; /* Timeout Queue */ 113 con *fdcon; 114 115 static void keyprint(con *c, struct sshkey *key); 116 117 static int 118 fdlim_get(int hard) 119 { 120 struct rlimit rlfd; 121 122 if (getrlimit(RLIMIT_NOFILE, &rlfd) == -1) 123 return (-1); 124 if ((hard ? rlfd.rlim_max : rlfd.rlim_cur) == RLIM_INFINITY) 125 return sysconf(_SC_OPEN_MAX); 126 else 127 return hard ? rlfd.rlim_max : rlfd.rlim_cur; 128 } 129 130 static int 131 fdlim_set(int lim) 132 { 133 struct rlimit rlfd; 134 135 if (lim <= 0) 136 return (-1); 137 if (getrlimit(RLIMIT_NOFILE, &rlfd) == -1) 138 return (-1); 139 rlfd.rlim_cur = lim; 140 if (setrlimit(RLIMIT_NOFILE, &rlfd) == -1) 141 return (-1); 142 return (0); 143 } 144 145 /* 146 * This is an strsep function that returns a null field for adjacent 147 * separators. This is the same as the 4.4BSD strsep, but different from the 148 * one in the GNU libc. 149 */ 150 static char * 151 xstrsep(char **str, const char *delim) 152 { 153 char *s, *e; 154 155 if (!**str) 156 return (NULL); 157 158 s = *str; 159 e = s + strcspn(s, delim); 160 161 if (*e != '\0') 162 *e++ = '\0'; 163 *str = e; 164 165 return (s); 166 } 167 168 /* 169 * Get the next non-null token (like GNU strsep). Strsep() will return a 170 * null token for two adjacent separators, so we may have to loop. 171 */ 172 static char * 173 strnnsep(char **stringp, char *delim) 174 { 175 char *tok; 176 177 do { 178 tok = xstrsep(stringp, delim); 179 } while (tok && *tok == '\0'); 180 return (tok); 181 } 182 183 184 static int 185 key_print_wrapper(struct sshkey *hostkey, struct ssh *ssh) 186 { 187 con *c; 188 189 if ((c = ssh_get_app_data(ssh)) != NULL) 190 keyprint(c, hostkey); 191 /* always abort key exchange */ 192 return -1; 193 } 194 195 static int 196 ssh2_capable(int remote_major, int remote_minor) 197 { 198 switch (remote_major) { 199 case 1: 200 if (remote_minor == 99) 201 return 1; 202 break; 203 case 2: 204 return 1; 205 default: 206 break; 207 } 208 return 0; 209 } 210 211 static void 212 keygrab_ssh2(con *c) 213 { 214 char *myproposal[PROPOSAL_MAX] = { KEX_CLIENT }; 215 int r; 216 217 switch (c->c_keytype) { 218 case KT_DSA: 219 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ? 220 "ssh-dss-cert-v01@openssh.com" : "ssh-dss"; 221 break; 222 case KT_RSA: 223 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ? 224 "rsa-sha2-512-cert-v01@openssh.com," 225 "rsa-sha2-256-cert-v01@openssh.com," 226 "ssh-rsa-cert-v01@openssh.com" : 227 "rsa-sha2-512," 228 "rsa-sha2-256," 229 "ssh-rsa"; 230 break; 231 case KT_ED25519: 232 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ? 233 "ssh-ed25519-cert-v01@openssh.com" : "ssh-ed25519"; 234 break; 235 case KT_XMSS: 236 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ? 237 "ssh-xmss-cert-v01@openssh.com" : "ssh-xmss@openssh.com"; 238 break; 239 case KT_ECDSA: 240 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ? 241 "ecdsa-sha2-nistp256-cert-v01@openssh.com," 242 "ecdsa-sha2-nistp384-cert-v01@openssh.com," 243 "ecdsa-sha2-nistp521-cert-v01@openssh.com" : 244 "ecdsa-sha2-nistp256," 245 "ecdsa-sha2-nistp384," 246 "ecdsa-sha2-nistp521"; 247 break; 248 case KT_ECDSA_SK: 249 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ? 250 "sk-ecdsa-sha2-nistp256-cert-v01@openssh.com" : 251 "sk-ecdsa-sha2-nistp256@openssh.com"; 252 break; 253 case KT_ED25519_SK: 254 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ? 255 "sk-ssh-ed25519-cert-v01@openssh.com" : 256 "sk-ssh-ed25519@openssh.com"; 257 break; 258 default: 259 fatal("unknown key type %d", c->c_keytype); 260 break; 261 } 262 if ((r = kex_setup(c->c_ssh, myproposal)) != 0) { 263 free(c->c_ssh); 264 fprintf(stderr, "kex_setup: %s\n", ssh_err(r)); 265 exit(1); 266 } 267 #ifdef WITH_OPENSSL 268 c->c_ssh->kex->kex[KEX_DH_GRP1_SHA1] = kex_gen_client; 269 c->c_ssh->kex->kex[KEX_DH_GRP14_SHA1] = kex_gen_client; 270 c->c_ssh->kex->kex[KEX_DH_GRP14_SHA256] = kex_gen_client; 271 c->c_ssh->kex->kex[KEX_DH_GRP16_SHA512] = kex_gen_client; 272 c->c_ssh->kex->kex[KEX_DH_GRP18_SHA512] = kex_gen_client; 273 c->c_ssh->kex->kex[KEX_DH_GEX_SHA1] = kexgex_client; 274 c->c_ssh->kex->kex[KEX_DH_GEX_SHA256] = kexgex_client; 275 c->c_ssh->kex->kex[KEX_ECDH_SHA2] = kex_gen_client; 276 #endif 277 c->c_ssh->kex->kex[KEX_C25519_SHA256] = kex_gen_client; 278 c->c_ssh->kex->kex[KEX_KEM_SNTRUP4591761X25519_SHA512] = kex_gen_client; 279 ssh_set_verify_host_key_callback(c->c_ssh, key_print_wrapper); 280 /* 281 * do the key-exchange until an error occurs or until 282 * the key_print_wrapper() callback sets c_done. 283 */ 284 ssh_dispatch_run(c->c_ssh, DISPATCH_BLOCK, &c->c_done); 285 } 286 287 static void 288 keyprint_one(const char *host, struct sshkey *key) 289 { 290 char *hostport; 291 const char *known_host, *hashed; 292 293 found_one = 1; 294 295 if (print_sshfp) { 296 export_dns_rr(host, key, stdout, 0); 297 return; 298 } 299 300 hostport = put_host_port(host, ssh_port); 301 lowercase(hostport); 302 if (hash_hosts && (hashed = host_hash(host, NULL, 0)) == NULL) 303 fatal("host_hash failed"); 304 known_host = hash_hosts ? hashed : hostport; 305 if (!get_cert) 306 fprintf(stdout, "%s ", known_host); 307 sshkey_write(key, stdout); 308 fputs("\n", stdout); 309 free(hostport); 310 } 311 312 static void 313 keyprint(con *c, struct sshkey *key) 314 { 315 char *hosts = c->c_output_name ? c->c_output_name : c->c_name; 316 char *host, *ohosts; 317 318 if (key == NULL) 319 return; 320 if (get_cert || (!hash_hosts && ssh_port == SSH_DEFAULT_PORT)) { 321 keyprint_one(hosts, key); 322 return; 323 } 324 ohosts = hosts = xstrdup(hosts); 325 while ((host = strsep(&hosts, ",")) != NULL) 326 keyprint_one(host, key); 327 free(ohosts); 328 } 329 330 static int 331 tcpconnect(char *host) 332 { 333 struct addrinfo hints, *ai, *aitop; 334 char strport[NI_MAXSERV]; 335 int gaierr, s = -1; 336 337 snprintf(strport, sizeof strport, "%d", ssh_port); 338 memset(&hints, 0, sizeof(hints)); 339 hints.ai_family = IPv4or6; 340 hints.ai_socktype = SOCK_STREAM; 341 if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) { 342 error("getaddrinfo %s: %s", host, ssh_gai_strerror(gaierr)); 343 return -1; 344 } 345 for (ai = aitop; ai; ai = ai->ai_next) { 346 s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); 347 if (s == -1) { 348 error("socket: %s", strerror(errno)); 349 continue; 350 } 351 if (set_nonblock(s) == -1) 352 fatal("%s: set_nonblock(%d)", __func__, s); 353 if (connect(s, ai->ai_addr, ai->ai_addrlen) == -1 && 354 errno != EINPROGRESS) 355 error("connect (`%s'): %s", host, strerror(errno)); 356 else 357 break; 358 close(s); 359 s = -1; 360 } 361 freeaddrinfo(aitop); 362 return s; 363 } 364 365 static int 366 conalloc(char *iname, char *oname, int keytype) 367 { 368 char *namebase, *name, *namelist; 369 int s; 370 371 namebase = namelist = xstrdup(iname); 372 373 do { 374 name = xstrsep(&namelist, ","); 375 if (!name) { 376 free(namebase); 377 return (-1); 378 } 379 } while ((s = tcpconnect(name)) < 0); 380 381 if (s >= maxfd) 382 fatal("conalloc: fdno %d too high", s); 383 if (fdcon[s].c_status) 384 fatal("conalloc: attempt to reuse fdno %d", s); 385 386 debug3("%s: oname %s kt %d", __func__, oname, keytype); 387 fdcon[s].c_fd = s; 388 fdcon[s].c_status = CS_CON; 389 fdcon[s].c_namebase = namebase; 390 fdcon[s].c_name = name; 391 fdcon[s].c_namelist = namelist; 392 fdcon[s].c_output_name = xstrdup(oname); 393 fdcon[s].c_data = (char *) &fdcon[s].c_plen; 394 fdcon[s].c_len = 4; 395 fdcon[s].c_off = 0; 396 fdcon[s].c_keytype = keytype; 397 monotime_tv(&fdcon[s].c_tv); 398 fdcon[s].c_tv.tv_sec += timeout; 399 TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link); 400 FD_SET(s, read_wait); 401 ncon++; 402 return (s); 403 } 404 405 static void 406 confree(int s) 407 { 408 if (s >= maxfd || fdcon[s].c_status == CS_UNUSED) 409 fatal("confree: attempt to free bad fdno %d", s); 410 free(fdcon[s].c_namebase); 411 free(fdcon[s].c_output_name); 412 if (fdcon[s].c_status == CS_KEYS) 413 free(fdcon[s].c_data); 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 FD_CLR(s, read_wait); 424 ncon--; 425 } 426 427 static void 428 contouch(int s) 429 { 430 TAILQ_REMOVE(&tq, &fdcon[s], c_link); 431 monotime_tv(&fdcon[s].c_tv); 432 fdcon[s].c_tv.tv_sec += timeout; 433 TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link); 434 } 435 436 static int 437 conrecycle(int s) 438 { 439 con *c = &fdcon[s]; 440 int ret; 441 442 ret = conalloc(c->c_namelist, c->c_output_name, c->c_keytype); 443 confree(s); 444 return (ret); 445 } 446 447 static void 448 congreet(int s) 449 { 450 int n = 0, remote_major = 0, remote_minor = 0; 451 char buf[256], *cp; 452 char remote_version[sizeof buf]; 453 size_t bufsiz; 454 con *c = &fdcon[s]; 455 456 /* send client banner */ 457 n = snprintf(buf, sizeof buf, "SSH-%d.%d-OpenSSH-keyscan\r\n", 458 PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2); 459 if (n < 0 || (size_t)n >= sizeof(buf)) { 460 error("snprintf: buffer too small"); 461 confree(s); 462 return; 463 } 464 if (atomicio(vwrite, s, buf, n) != (size_t)n) { 465 error("write (%s): %s", c->c_name, strerror(errno)); 466 confree(s); 467 return; 468 } 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 != '\n' && *cp != '\r') { 498 error("%s: bad greeting", c->c_name); 499 confree(s); 500 return; 501 } 502 *cp = '\0'; 503 if ((c->c_ssh = ssh_packet_set_connection(NULL, s, s)) == NULL) 504 fatal("ssh_packet_set_connection failed"); 505 ssh_packet_set_timeout(c->c_ssh, timeout, 1); 506 ssh_set_app_data(c->c_ssh, c); /* back link */ 507 if (sscanf(buf, "SSH-%d.%d-%[^\n]\n", 508 &remote_major, &remote_minor, remote_version) == 3) 509 c->c_ssh->compat = compat_datafellows(remote_version); 510 else 511 c->c_ssh->compat = 0; 512 if (!ssh2_capable(remote_major, remote_minor)) { 513 debug("%s doesn't support ssh2", c->c_name); 514 confree(s); 515 return; 516 } 517 fprintf(stderr, "%c %s:%d %s\n", print_sshfp ? ';' : '#', 518 c->c_name, ssh_port, chop(buf)); 519 keygrab_ssh2(c); 520 confree(s); 521 } 522 523 static void 524 conread(int s) 525 { 526 con *c = &fdcon[s]; 527 size_t n; 528 529 if (c->c_status == CS_CON) { 530 congreet(s); 531 return; 532 } 533 n = atomicio(read, s, c->c_data + c->c_off, c->c_len - c->c_off); 534 if (n == 0) { 535 error("read (%s): %s", c->c_name, strerror(errno)); 536 confree(s); 537 return; 538 } 539 c->c_off += n; 540 541 if (c->c_off == c->c_len) 542 switch (c->c_status) { 543 case CS_SIZE: 544 c->c_plen = htonl(c->c_plen); 545 c->c_len = c->c_plen + 8 - (c->c_plen & 7); 546 c->c_off = 0; 547 c->c_data = xmalloc(c->c_len); 548 c->c_status = CS_KEYS; 549 break; 550 default: 551 fatal("conread: invalid status %d", c->c_status); 552 break; 553 } 554 555 contouch(s); 556 } 557 558 static void 559 conloop(void) 560 { 561 struct timeval seltime, now; 562 fd_set *r, *e; 563 con *c; 564 int i; 565 566 monotime_tv(&now); 567 c = TAILQ_FIRST(&tq); 568 569 if (c && (c->c_tv.tv_sec > now.tv_sec || 570 (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec > now.tv_usec))) { 571 seltime = c->c_tv; 572 seltime.tv_sec -= now.tv_sec; 573 seltime.tv_usec -= now.tv_usec; 574 if (seltime.tv_usec < 0) { 575 seltime.tv_usec += 1000000; 576 seltime.tv_sec--; 577 } 578 } else 579 timerclear(&seltime); 580 581 r = xcalloc(read_wait_nfdset, sizeof(fd_mask)); 582 e = xcalloc(read_wait_nfdset, sizeof(fd_mask)); 583 memcpy(r, read_wait, read_wait_nfdset * sizeof(fd_mask)); 584 memcpy(e, read_wait, read_wait_nfdset * sizeof(fd_mask)); 585 586 while (select(maxfd, r, NULL, e, &seltime) == -1 && 587 (errno == EAGAIN || errno == EINTR)) 588 ; 589 590 for (i = 0; i < maxfd; i++) { 591 if (FD_ISSET(i, e)) { 592 error("%s: exception!", fdcon[i].c_name); 593 confree(i); 594 } else if (FD_ISSET(i, r)) 595 conread(i); 596 } 597 free(r); 598 free(e); 599 600 c = TAILQ_FIRST(&tq); 601 while (c && (c->c_tv.tv_sec < now.tv_sec || 602 (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec < now.tv_usec))) { 603 int s = c->c_fd; 604 605 c = TAILQ_NEXT(c, c_link); 606 conrecycle(s); 607 } 608 } 609 610 static void 611 do_host(char *host) 612 { 613 char *name = strnnsep(&host, " \t\n"); 614 int j; 615 616 if (name == NULL) 617 return; 618 for (j = KT_MIN; j <= KT_MAX; j *= 2) { 619 if (get_keytypes & j) { 620 while (ncon >= MAXCON) 621 conloop(); 622 conalloc(name, *host ? host : name, j); 623 } 624 } 625 } 626 627 void 628 fatal(const char *fmt,...) 629 { 630 va_list args; 631 632 va_start(args, fmt); 633 do_log(SYSLOG_LEVEL_FATAL, fmt, args); 634 va_end(args); 635 exit(255); 636 } 637 638 static void 639 usage(void) 640 { 641 fprintf(stderr, 642 "usage: %s [-46cDHv] [-f file] [-p port] [-T timeout] [-t type]\n" 643 "\t\t [host | addrlist namelist]\n", 644 __progname); 645 exit(1); 646 } 647 648 int 649 main(int argc, char **argv) 650 { 651 int debug_flag = 0, log_level = SYSLOG_LEVEL_INFO; 652 int opt, fopt_count = 0, j; 653 char *tname, *cp, *line = NULL; 654 size_t linesize = 0; 655 FILE *fp; 656 657 extern int optind; 658 extern char *optarg; 659 660 TAILQ_INIT(&tq); 661 662 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ 663 sanitise_stdfd(); 664 665 if (argc <= 1) 666 usage(); 667 668 while ((opt = getopt(argc, argv, "cDHv46p:T:t:f:")) != -1) { 669 switch (opt) { 670 case 'H': 671 hash_hosts = 1; 672 break; 673 case 'c': 674 get_cert = 1; 675 break; 676 case 'D': 677 print_sshfp = 1; 678 break; 679 case 'p': 680 ssh_port = a2port(optarg); 681 if (ssh_port <= 0) { 682 fprintf(stderr, "Bad port '%s'\n", optarg); 683 exit(1); 684 } 685 break; 686 case 'T': 687 timeout = convtime(optarg); 688 if (timeout == -1 || timeout == 0) { 689 fprintf(stderr, "Bad timeout '%s'\n", optarg); 690 usage(); 691 } 692 break; 693 case 'v': 694 if (!debug_flag) { 695 debug_flag = 1; 696 log_level = SYSLOG_LEVEL_DEBUG1; 697 } 698 else if (log_level < SYSLOG_LEVEL_DEBUG3) 699 log_level++; 700 else 701 fatal("Too high debugging level."); 702 break; 703 case 'f': 704 if (strcmp(optarg, "-") == 0) 705 optarg = NULL; 706 argv[fopt_count++] = optarg; 707 break; 708 case 't': 709 get_keytypes = 0; 710 tname = strtok(optarg, ","); 711 while (tname) { 712 int type = sshkey_type_from_name(tname); 713 714 switch (type) { 715 case KEY_DSA: 716 get_keytypes |= KT_DSA; 717 break; 718 case KEY_ECDSA: 719 get_keytypes |= KT_ECDSA; 720 break; 721 case KEY_RSA: 722 get_keytypes |= KT_RSA; 723 break; 724 case KEY_ED25519: 725 get_keytypes |= KT_ED25519; 726 break; 727 case KEY_XMSS: 728 get_keytypes |= KT_XMSS; 729 break; 730 case KEY_ED25519_SK: 731 get_keytypes |= KT_ED25519_SK; 732 break; 733 case KEY_ECDSA_SK: 734 get_keytypes |= KT_ECDSA_SK; 735 break; 736 case KEY_UNSPEC: 737 default: 738 fatal("Unknown key type \"%s\"", tname); 739 } 740 tname = strtok(NULL, ","); 741 } 742 break; 743 case '4': 744 IPv4or6 = AF_INET; 745 break; 746 case '6': 747 IPv4or6 = AF_INET6; 748 break; 749 case '?': 750 default: 751 usage(); 752 } 753 } 754 if (optind == argc && !fopt_count) 755 usage(); 756 757 log_init("ssh-keyscan", log_level, SYSLOG_FACILITY_USER, 1); 758 759 maxfd = fdlim_get(1); 760 if (maxfd < 0) 761 fatal("%s: fdlim_get: bad value", __progname); 762 if (maxfd > MAXMAXFD) 763 maxfd = MAXMAXFD; 764 if (MAXCON <= 0) 765 fatal("%s: not enough file descriptors", __progname); 766 if (maxfd > fdlim_get(0)) 767 fdlim_set(maxfd); 768 fdcon = xcalloc(maxfd, sizeof(con)); 769 770 read_wait_nfdset = howmany(maxfd, NFDBITS); 771 read_wait = xcalloc(read_wait_nfdset, sizeof(fd_mask)); 772 773 for (j = 0; j < fopt_count; j++) { 774 if (argv[j] == NULL) 775 fp = stdin; 776 else if ((fp = fopen(argv[j], "r")) == NULL) 777 fatal("%s: %s: %s", __progname, argv[j], 778 strerror(errno)); 779 780 while (getline(&line, &linesize, fp) != -1) { 781 /* Chomp off trailing whitespace and comments */ 782 if ((cp = strchr(line, '#')) == NULL) 783 cp = line + strlen(line) - 1; 784 while (cp >= line) { 785 if (*cp == ' ' || *cp == '\t' || 786 *cp == '\n' || *cp == '#') 787 *cp-- = '\0'; 788 else 789 break; 790 } 791 792 /* Skip empty lines */ 793 if (*line == '\0') 794 continue; 795 796 do_host(line); 797 } 798 799 if (ferror(fp)) 800 fatal("%s: %s: %s", __progname, argv[j], 801 strerror(errno)); 802 803 fclose(fp); 804 } 805 free(line); 806 807 while (optind < argc) 808 do_host(argv[optind++]); 809 810 while (ncon > 0) 811 conloop(); 812 813 return found_one ? 0 : 1; 814 } 815