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 "includes.h" 11 12 #include <sys/types.h> 13 #include "openbsd-compat/sys-queue.h" 14 #include <sys/resource.h> 15 #ifdef HAVE_SYS_TIME_H 16 # include <sys/time.h> 17 #endif 18 19 #include <netinet/in.h> 20 #include <arpa/inet.h> 21 22 #include <openssl/bn.h> 23 24 #include <netdb.h> 25 #include <errno.h> 26 #include <stdarg.h> 27 #include <stdio.h> 28 #include <stdlib.h> 29 #include <signal.h> 30 #include <string.h> 31 #include <unistd.h> 32 33 #include "xmalloc.h" 34 #include "ssh.h" 35 #include "ssh1.h" 36 #include "sshbuf.h" 37 #include "sshkey.h" 38 #include "cipher.h" 39 #include "kex.h" 40 #include "compat.h" 41 #include "myproposal.h" 42 #include "packet.h" 43 #include "dispatch.h" 44 #include "log.h" 45 #include "atomicio.h" 46 #include "misc.h" 47 #include "hostfile.h" 48 #include "ssherr.h" 49 #include "ssh_api.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_RSA1 1 58 #define KT_DSA 2 59 #define KT_RSA 4 60 #define KT_ECDSA 8 61 #define KT_ED25519 16 62 63 int get_cert = 0; 64 int get_keytypes = KT_RSA|KT_ECDSA|KT_ED25519; 65 66 int hash_hosts = 0; /* Hash hostname on output */ 67 68 #define MAXMAXFD 256 69 70 /* The number of seconds after which to give up on a TCP connection */ 71 int timeout = 5; 72 73 int maxfd; 74 #define MAXCON (maxfd - 10) 75 76 extern char *__progname; 77 fd_set *read_wait; 78 size_t read_wait_nfdset; 79 int ncon; 80 81 struct ssh *active_state = NULL; /* XXX needed for linking */ 82 83 /* 84 * Keep a connection structure for each file descriptor. The state 85 * associated with file descriptor n is held in fdcon[n]. 86 */ 87 typedef struct Connection { 88 u_char c_status; /* State of connection on this file desc. */ 89 #define CS_UNUSED 0 /* File descriptor unused */ 90 #define CS_CON 1 /* Waiting to connect/read greeting */ 91 #define CS_SIZE 2 /* Waiting to read initial packet size */ 92 #define CS_KEYS 3 /* Waiting to read public key packet */ 93 int c_fd; /* Quick lookup: c->c_fd == c - fdcon */ 94 int c_plen; /* Packet length field for ssh packet */ 95 int c_len; /* Total bytes which must be read. */ 96 int c_off; /* Length of data read so far. */ 97 int c_keytype; /* Only one of KT_RSA1, KT_DSA, or KT_RSA */ 98 sig_atomic_t c_done; /* SSH2 done */ 99 char *c_namebase; /* Address to free for c_name and c_namelist */ 100 char *c_name; /* Hostname of connection for errors */ 101 char *c_namelist; /* Pointer to other possible addresses */ 102 char *c_output_name; /* Hostname of connection for output */ 103 char *c_data; /* Data read from this fd */ 104 struct ssh *c_ssh; /* SSH-connection */ 105 struct timeval c_tv; /* Time at which connection gets aborted */ 106 TAILQ_ENTRY(Connection) c_link; /* List of connections in timeout order. */ 107 } con; 108 109 TAILQ_HEAD(conlist, Connection) tq; /* Timeout Queue */ 110 con *fdcon; 111 112 static void keyprint(con *c, struct sshkey *key); 113 114 static int 115 fdlim_get(int hard) 116 { 117 #if defined(HAVE_GETRLIMIT) && defined(RLIMIT_NOFILE) 118 struct rlimit rlfd; 119 120 if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0) 121 return (-1); 122 if ((hard ? rlfd.rlim_max : rlfd.rlim_cur) == RLIM_INFINITY) 123 return SSH_SYSFDMAX; 124 else 125 return hard ? rlfd.rlim_max : rlfd.rlim_cur; 126 #else 127 return SSH_SYSFDMAX; 128 #endif 129 } 130 131 static int 132 fdlim_set(int lim) 133 { 134 #if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE) 135 struct rlimit rlfd; 136 #endif 137 138 if (lim <= 0) 139 return (-1); 140 #if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE) 141 if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0) 142 return (-1); 143 rlfd.rlim_cur = lim; 144 if (setrlimit(RLIMIT_NOFILE, &rlfd) < 0) 145 return (-1); 146 #elif defined (HAVE_SETDTABLESIZE) 147 setdtablesize(lim); 148 #endif 149 return (0); 150 } 151 152 /* 153 * This is an strsep function that returns a null field for adjacent 154 * separators. This is the same as the 4.4BSD strsep, but different from the 155 * one in the GNU libc. 156 */ 157 static char * 158 xstrsep(char **str, const char *delim) 159 { 160 char *s, *e; 161 162 if (!**str) 163 return (NULL); 164 165 s = *str; 166 e = s + strcspn(s, delim); 167 168 if (*e != '\0') 169 *e++ = '\0'; 170 *str = e; 171 172 return (s); 173 } 174 175 /* 176 * Get the next non-null token (like GNU strsep). Strsep() will return a 177 * null token for two adjacent separators, so we may have to loop. 178 */ 179 static char * 180 strnnsep(char **stringp, char *delim) 181 { 182 char *tok; 183 184 do { 185 tok = xstrsep(stringp, delim); 186 } while (tok && *tok == '\0'); 187 return (tok); 188 } 189 190 #ifdef WITH_SSH1 191 static struct sshkey * 192 keygrab_ssh1(con *c) 193 { 194 static struct sshkey *rsa; 195 static struct sshbuf *msg; 196 int r; 197 u_char type; 198 199 if (rsa == NULL) { 200 if ((rsa = sshkey_new(KEY_RSA1)) == NULL) { 201 error("%s: sshkey_new failed", __func__); 202 return NULL; 203 } 204 if ((msg = sshbuf_new()) == NULL) 205 fatal("%s: sshbuf_new failed", __func__); 206 } 207 if ((r = sshbuf_put(msg, c->c_data, c->c_plen)) != 0 || 208 (r = sshbuf_consume(msg, 8 - (c->c_plen & 7))) != 0 || /* padding */ 209 (r = sshbuf_get_u8(msg, &type)) != 0) 210 goto buf_err; 211 if (type != (int) SSH_SMSG_PUBLIC_KEY) { 212 error("%s: invalid packet type", c->c_name); 213 sshbuf_reset(msg); 214 return NULL; 215 } 216 if ((r = sshbuf_consume(msg, 8)) != 0 || /* cookie */ 217 /* server key */ 218 (r = sshbuf_get_u32(msg, NULL)) != 0 || 219 (r = sshbuf_get_bignum1(msg, NULL)) != 0 || 220 (r = sshbuf_get_bignum1(msg, NULL)) != 0 || 221 /* host key */ 222 (r = sshbuf_get_u32(msg, NULL)) != 0 || 223 (r = sshbuf_get_bignum1(msg, rsa->rsa->e)) != 0 || 224 (r = sshbuf_get_bignum1(msg, rsa->rsa->n)) != 0) { 225 buf_err: 226 error("%s: buffer error: %s", __func__, ssh_err(r)); 227 sshbuf_reset(msg); 228 return NULL; 229 } 230 231 sshbuf_reset(msg); 232 233 return (rsa); 234 } 235 #endif 236 237 static int 238 key_print_wrapper(struct sshkey *hostkey, struct ssh *ssh) 239 { 240 con *c; 241 242 if ((c = ssh_get_app_data(ssh)) != NULL) 243 keyprint(c, hostkey); 244 /* always abort key exchange */ 245 return -1; 246 } 247 248 static int 249 ssh2_capable(int remote_major, int remote_minor) 250 { 251 switch (remote_major) { 252 case 1: 253 if (remote_minor == 99) 254 return 1; 255 break; 256 case 2: 257 return 1; 258 default: 259 break; 260 } 261 return 0; 262 } 263 264 static void 265 keygrab_ssh2(con *c) 266 { 267 char *myproposal[PROPOSAL_MAX] = { KEX_CLIENT }; 268 int r; 269 270 enable_compat20(); 271 switch (c->c_keytype) { 272 case KT_DSA: 273 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ? 274 "ssh-dss-cert-v01@openssh.com" : "ssh-dss"; 275 break; 276 case KT_RSA: 277 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ? 278 "ssh-rsa-cert-v01@openssh.com" : "ssh-rsa"; 279 break; 280 case KT_ED25519: 281 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ? 282 "ssh-ed25519-cert-v01@openssh.com" : "ssh-ed25519"; 283 break; 284 case KT_ECDSA: 285 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ? 286 "ecdsa-sha2-nistp256-cert-v01@openssh.com," 287 "ecdsa-sha2-nistp384-cert-v01@openssh.com," 288 "ecdsa-sha2-nistp521-cert-v01@openssh.com" : 289 "ecdsa-sha2-nistp256," 290 "ecdsa-sha2-nistp384," 291 "ecdsa-sha2-nistp521"; 292 break; 293 default: 294 fatal("unknown key type %d", c->c_keytype); 295 break; 296 } 297 if ((r = kex_setup(c->c_ssh, myproposal)) != 0) { 298 free(c->c_ssh); 299 fprintf(stderr, "kex_setup: %s\n", ssh_err(r)); 300 exit(1); 301 } 302 #ifdef WITH_OPENSSL 303 c->c_ssh->kex->kex[KEX_DH_GRP1_SHA1] = kexdh_client; 304 c->c_ssh->kex->kex[KEX_DH_GRP14_SHA1] = kexdh_client; 305 c->c_ssh->kex->kex[KEX_DH_GRP14_SHA256] = kexdh_client; 306 c->c_ssh->kex->kex[KEX_DH_GRP16_SHA512] = kexdh_client; 307 c->c_ssh->kex->kex[KEX_DH_GRP18_SHA512] = kexdh_client; 308 c->c_ssh->kex->kex[KEX_DH_GEX_SHA1] = kexgex_client; 309 c->c_ssh->kex->kex[KEX_DH_GEX_SHA256] = kexgex_client; 310 # ifdef OPENSSL_HAS_ECC 311 c->c_ssh->kex->kex[KEX_ECDH_SHA2] = kexecdh_client; 312 # endif 313 #endif 314 c->c_ssh->kex->kex[KEX_C25519_SHA256] = kexc25519_client; 315 ssh_set_verify_host_key_callback(c->c_ssh, key_print_wrapper); 316 /* 317 * do the key-exchange until an error occurs or until 318 * the key_print_wrapper() callback sets c_done. 319 */ 320 ssh_dispatch_run(c->c_ssh, DISPATCH_BLOCK, &c->c_done, c->c_ssh); 321 } 322 323 static void 324 keyprint_one(const char *host, struct sshkey *key) 325 { 326 char *hostport; 327 const char *known_host, *hashed; 328 329 hostport = put_host_port(host, ssh_port); 330 lowercase(hostport); 331 if (hash_hosts && (hashed = host_hash(host, NULL, 0)) == NULL) 332 fatal("host_hash failed"); 333 known_host = hash_hosts ? hashed : hostport; 334 if (!get_cert) 335 fprintf(stdout, "%s ", known_host); 336 sshkey_write(key, stdout); 337 fputs("\n", stdout); 338 free(hostport); 339 } 340 341 static void 342 keyprint(con *c, struct sshkey *key) 343 { 344 char *hosts = c->c_output_name ? c->c_output_name : c->c_name; 345 char *host, *ohosts; 346 347 if (key == NULL) 348 return; 349 if (get_cert || (!hash_hosts && ssh_port == SSH_DEFAULT_PORT)) { 350 keyprint_one(hosts, key); 351 return; 352 } 353 ohosts = hosts = xstrdup(hosts); 354 while ((host = strsep(&hosts, ",")) != NULL) 355 keyprint_one(host, key); 356 free(ohosts); 357 } 358 359 static int 360 tcpconnect(char *host) 361 { 362 struct addrinfo hints, *ai, *aitop; 363 char strport[NI_MAXSERV]; 364 int gaierr, s = -1; 365 366 snprintf(strport, sizeof strport, "%d", ssh_port); 367 memset(&hints, 0, sizeof(hints)); 368 hints.ai_family = IPv4or6; 369 hints.ai_socktype = SOCK_STREAM; 370 if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) { 371 error("getaddrinfo %s: %s", host, ssh_gai_strerror(gaierr)); 372 return -1; 373 } 374 for (ai = aitop; ai; ai = ai->ai_next) { 375 s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); 376 if (s < 0) { 377 error("socket: %s", strerror(errno)); 378 continue; 379 } 380 if (set_nonblock(s) == -1) 381 fatal("%s: set_nonblock(%d)", __func__, s); 382 if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0 && 383 errno != EINPROGRESS) 384 error("connect (`%s'): %s", host, strerror(errno)); 385 else 386 break; 387 close(s); 388 s = -1; 389 } 390 freeaddrinfo(aitop); 391 return s; 392 } 393 394 static int 395 conalloc(char *iname, char *oname, int keytype) 396 { 397 char *namebase, *name, *namelist; 398 int s; 399 400 namebase = namelist = xstrdup(iname); 401 402 do { 403 name = xstrsep(&namelist, ","); 404 if (!name) { 405 free(namebase); 406 return (-1); 407 } 408 } while ((s = tcpconnect(name)) < 0); 409 410 if (s >= maxfd) 411 fatal("conalloc: fdno %d too high", s); 412 if (fdcon[s].c_status) 413 fatal("conalloc: attempt to reuse fdno %d", s); 414 415 debug3("%s: oname %s kt %d", __func__, oname, keytype); 416 fdcon[s].c_fd = s; 417 fdcon[s].c_status = CS_CON; 418 fdcon[s].c_namebase = namebase; 419 fdcon[s].c_name = name; 420 fdcon[s].c_namelist = namelist; 421 fdcon[s].c_output_name = xstrdup(oname); 422 fdcon[s].c_data = (char *) &fdcon[s].c_plen; 423 fdcon[s].c_len = 4; 424 fdcon[s].c_off = 0; 425 fdcon[s].c_keytype = keytype; 426 gettimeofday(&fdcon[s].c_tv, NULL); 427 fdcon[s].c_tv.tv_sec += timeout; 428 TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link); 429 FD_SET(s, read_wait); 430 ncon++; 431 return (s); 432 } 433 434 static void 435 confree(int s) 436 { 437 if (s >= maxfd || fdcon[s].c_status == CS_UNUSED) 438 fatal("confree: attempt to free bad fdno %d", s); 439 close(s); 440 free(fdcon[s].c_namebase); 441 free(fdcon[s].c_output_name); 442 if (fdcon[s].c_status == CS_KEYS) 443 free(fdcon[s].c_data); 444 fdcon[s].c_status = CS_UNUSED; 445 fdcon[s].c_keytype = 0; 446 if (fdcon[s].c_ssh) { 447 ssh_packet_close(fdcon[s].c_ssh); 448 free(fdcon[s].c_ssh); 449 fdcon[s].c_ssh = NULL; 450 } 451 TAILQ_REMOVE(&tq, &fdcon[s], c_link); 452 FD_CLR(s, read_wait); 453 ncon--; 454 } 455 456 static void 457 contouch(int s) 458 { 459 TAILQ_REMOVE(&tq, &fdcon[s], c_link); 460 gettimeofday(&fdcon[s].c_tv, NULL); 461 fdcon[s].c_tv.tv_sec += timeout; 462 TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link); 463 } 464 465 static int 466 conrecycle(int s) 467 { 468 con *c = &fdcon[s]; 469 int ret; 470 471 ret = conalloc(c->c_namelist, c->c_output_name, c->c_keytype); 472 confree(s); 473 return (ret); 474 } 475 476 static void 477 congreet(int s) 478 { 479 int n = 0, remote_major = 0, remote_minor = 0; 480 char buf[256], *cp; 481 char remote_version[sizeof buf]; 482 size_t bufsiz; 483 con *c = &fdcon[s]; 484 485 for (;;) { 486 memset(buf, '\0', sizeof(buf)); 487 bufsiz = sizeof(buf); 488 cp = buf; 489 while (bufsiz-- && 490 (n = atomicio(read, s, cp, 1)) == 1 && *cp != '\n') { 491 if (*cp == '\r') 492 *cp = '\n'; 493 cp++; 494 } 495 if (n != 1 || strncmp(buf, "SSH-", 4) == 0) 496 break; 497 } 498 if (n == 0) { 499 switch (errno) { 500 case EPIPE: 501 error("%s: Connection closed by remote host", c->c_name); 502 break; 503 case ECONNREFUSED: 504 break; 505 default: 506 error("read (%s): %s", c->c_name, strerror(errno)); 507 break; 508 } 509 conrecycle(s); 510 return; 511 } 512 if (*cp != '\n' && *cp != '\r') { 513 error("%s: bad greeting", c->c_name); 514 confree(s); 515 return; 516 } 517 *cp = '\0'; 518 if ((c->c_ssh = ssh_packet_set_connection(NULL, s, s)) == NULL) 519 fatal("ssh_packet_set_connection failed"); 520 ssh_packet_set_timeout(c->c_ssh, timeout, 1); 521 ssh_set_app_data(c->c_ssh, c); /* back link */ 522 if (sscanf(buf, "SSH-%d.%d-%[^\n]\n", 523 &remote_major, &remote_minor, remote_version) == 3) 524 c->c_ssh->compat = compat_datafellows(remote_version); 525 else 526 c->c_ssh->compat = 0; 527 if (c->c_keytype != KT_RSA1) { 528 if (!ssh2_capable(remote_major, remote_minor)) { 529 debug("%s doesn't support ssh2", c->c_name); 530 confree(s); 531 return; 532 } 533 } else if (remote_major != 1) { 534 debug("%s doesn't support ssh1", c->c_name); 535 confree(s); 536 return; 537 } 538 fprintf(stderr, "# %s:%d %s\n", c->c_name, ssh_port, chop(buf)); 539 n = snprintf(buf, sizeof buf, "SSH-%d.%d-OpenSSH-keyscan\r\n", 540 c->c_keytype == KT_RSA1? PROTOCOL_MAJOR_1 : PROTOCOL_MAJOR_2, 541 c->c_keytype == KT_RSA1? PROTOCOL_MINOR_1 : PROTOCOL_MINOR_2); 542 if (n < 0 || (size_t)n >= sizeof(buf)) { 543 error("snprintf: buffer too small"); 544 confree(s); 545 return; 546 } 547 if (atomicio(vwrite, s, buf, n) != (size_t)n) { 548 error("write (%s): %s", c->c_name, strerror(errno)); 549 confree(s); 550 return; 551 } 552 if (c->c_keytype != KT_RSA1) { 553 keygrab_ssh2(c); 554 confree(s); 555 return; 556 } 557 c->c_status = CS_SIZE; 558 contouch(s); 559 } 560 561 static void 562 conread(int s) 563 { 564 con *c = &fdcon[s]; 565 size_t n; 566 567 if (c->c_status == CS_CON) { 568 congreet(s); 569 return; 570 } 571 n = atomicio(read, s, c->c_data + c->c_off, c->c_len - c->c_off); 572 if (n == 0) { 573 error("read (%s): %s", c->c_name, strerror(errno)); 574 confree(s); 575 return; 576 } 577 c->c_off += n; 578 579 if (c->c_off == c->c_len) 580 switch (c->c_status) { 581 case CS_SIZE: 582 c->c_plen = htonl(c->c_plen); 583 c->c_len = c->c_plen + 8 - (c->c_plen & 7); 584 c->c_off = 0; 585 c->c_data = xmalloc(c->c_len); 586 c->c_status = CS_KEYS; 587 break; 588 #ifdef WITH_SSH1 589 case CS_KEYS: 590 keyprint(c, keygrab_ssh1(c)); 591 confree(s); 592 return; 593 #endif 594 default: 595 fatal("conread: invalid status %d", c->c_status); 596 break; 597 } 598 599 contouch(s); 600 } 601 602 static void 603 conloop(void) 604 { 605 struct timeval seltime, now; 606 fd_set *r, *e; 607 con *c; 608 int i; 609 610 gettimeofday(&now, NULL); 611 c = TAILQ_FIRST(&tq); 612 613 if (c && (c->c_tv.tv_sec > now.tv_sec || 614 (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec > now.tv_usec))) { 615 seltime = c->c_tv; 616 seltime.tv_sec -= now.tv_sec; 617 seltime.tv_usec -= now.tv_usec; 618 if (seltime.tv_usec < 0) { 619 seltime.tv_usec += 1000000; 620 seltime.tv_sec--; 621 } 622 } else 623 timerclear(&seltime); 624 625 r = xcalloc(read_wait_nfdset, sizeof(fd_mask)); 626 e = xcalloc(read_wait_nfdset, sizeof(fd_mask)); 627 memcpy(r, read_wait, read_wait_nfdset * sizeof(fd_mask)); 628 memcpy(e, read_wait, read_wait_nfdset * sizeof(fd_mask)); 629 630 while (select(maxfd, r, NULL, e, &seltime) == -1 && 631 (errno == EAGAIN || errno == EINTR || errno == EWOULDBLOCK)) 632 ; 633 634 for (i = 0; i < maxfd; i++) { 635 if (FD_ISSET(i, e)) { 636 error("%s: exception!", fdcon[i].c_name); 637 confree(i); 638 } else if (FD_ISSET(i, r)) 639 conread(i); 640 } 641 free(r); 642 free(e); 643 644 c = TAILQ_FIRST(&tq); 645 while (c && (c->c_tv.tv_sec < now.tv_sec || 646 (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec < now.tv_usec))) { 647 int s = c->c_fd; 648 649 c = TAILQ_NEXT(c, c_link); 650 conrecycle(s); 651 } 652 } 653 654 static void 655 do_host(char *host) 656 { 657 char *name = strnnsep(&host, " \t\n"); 658 int j; 659 660 if (name == NULL) 661 return; 662 for (j = KT_RSA1; j <= KT_ED25519; j *= 2) { 663 if (get_keytypes & j) { 664 while (ncon >= MAXCON) 665 conloop(); 666 conalloc(name, *host ? host : name, j); 667 } 668 } 669 } 670 671 void 672 fatal(const char *fmt,...) 673 { 674 va_list args; 675 676 va_start(args, fmt); 677 do_log(SYSLOG_LEVEL_FATAL, fmt, args); 678 va_end(args); 679 exit(255); 680 } 681 682 static void 683 usage(void) 684 { 685 fprintf(stderr, 686 "usage: %s [-46cHv] [-f file] [-p port] [-T timeout] [-t type]\n" 687 "\t\t [host | addrlist namelist] ...\n", 688 __progname); 689 exit(1); 690 } 691 692 int 693 main(int argc, char **argv) 694 { 695 int debug_flag = 0, log_level = SYSLOG_LEVEL_INFO; 696 int opt, fopt_count = 0, j; 697 char *tname, *cp, line[NI_MAXHOST]; 698 FILE *fp; 699 u_long linenum; 700 701 extern int optind; 702 extern char *optarg; 703 704 ssh_malloc_init(); /* must be called before any mallocs */ 705 __progname = ssh_get_progname(argv[0]); 706 seed_rng(); 707 TAILQ_INIT(&tq); 708 709 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ 710 sanitise_stdfd(); 711 712 if (argc <= 1) 713 usage(); 714 715 while ((opt = getopt(argc, argv, "cHv46p:T:t:f:")) != -1) { 716 switch (opt) { 717 case 'H': 718 hash_hosts = 1; 719 break; 720 case 'c': 721 get_cert = 1; 722 break; 723 case 'p': 724 ssh_port = a2port(optarg); 725 if (ssh_port <= 0) { 726 fprintf(stderr, "Bad port '%s'\n", optarg); 727 exit(1); 728 } 729 break; 730 case 'T': 731 timeout = convtime(optarg); 732 if (timeout == -1 || timeout == 0) { 733 fprintf(stderr, "Bad timeout '%s'\n", optarg); 734 usage(); 735 } 736 break; 737 case 'v': 738 if (!debug_flag) { 739 debug_flag = 1; 740 log_level = SYSLOG_LEVEL_DEBUG1; 741 } 742 else if (log_level < SYSLOG_LEVEL_DEBUG3) 743 log_level++; 744 else 745 fatal("Too high debugging level."); 746 break; 747 case 'f': 748 if (strcmp(optarg, "-") == 0) 749 optarg = NULL; 750 argv[fopt_count++] = optarg; 751 break; 752 case 't': 753 get_keytypes = 0; 754 tname = strtok(optarg, ","); 755 while (tname) { 756 int type = sshkey_type_from_name(tname); 757 758 switch (type) { 759 #ifdef WITH_SSH1 760 case KEY_RSA1: 761 get_keytypes |= KT_RSA1; 762 break; 763 #endif 764 case KEY_DSA: 765 get_keytypes |= KT_DSA; 766 break; 767 case KEY_ECDSA: 768 get_keytypes |= KT_ECDSA; 769 break; 770 case KEY_RSA: 771 get_keytypes |= KT_RSA; 772 break; 773 case KEY_ED25519: 774 get_keytypes |= KT_ED25519; 775 break; 776 case KEY_UNSPEC: 777 default: 778 fatal("Unknown key type \"%s\"", tname); 779 } 780 tname = strtok(NULL, ","); 781 } 782 break; 783 case '4': 784 IPv4or6 = AF_INET; 785 break; 786 case '6': 787 IPv4or6 = AF_INET6; 788 break; 789 case '?': 790 default: 791 usage(); 792 } 793 } 794 if (optind == argc && !fopt_count) 795 usage(); 796 797 log_init("ssh-keyscan", log_level, SYSLOG_FACILITY_USER, 1); 798 799 maxfd = fdlim_get(1); 800 if (maxfd < 0) 801 fatal("%s: fdlim_get: bad value", __progname); 802 if (maxfd > MAXMAXFD) 803 maxfd = MAXMAXFD; 804 if (MAXCON <= 0) 805 fatal("%s: not enough file descriptors", __progname); 806 if (maxfd > fdlim_get(0)) 807 fdlim_set(maxfd); 808 fdcon = xcalloc(maxfd, sizeof(con)); 809 810 read_wait_nfdset = howmany(maxfd, NFDBITS); 811 read_wait = xcalloc(read_wait_nfdset, sizeof(fd_mask)); 812 813 for (j = 0; j < fopt_count; j++) { 814 if (argv[j] == NULL) 815 fp = stdin; 816 else if ((fp = fopen(argv[j], "r")) == NULL) 817 fatal("%s: %s: %s", __progname, argv[j], 818 strerror(errno)); 819 linenum = 0; 820 821 while (read_keyfile_line(fp, 822 argv[j] == NULL ? "(stdin)" : argv[j], line, sizeof(line), 823 &linenum) != -1) { 824 /* Chomp off trailing whitespace and comments */ 825 if ((cp = strchr(line, '#')) == NULL) 826 cp = line + strlen(line) - 1; 827 while (cp >= line) { 828 if (*cp == ' ' || *cp == '\t' || 829 *cp == '\n' || *cp == '#') 830 *cp-- = '\0'; 831 else 832 break; 833 } 834 835 /* Skip empty lines */ 836 if (*line == '\0') 837 continue; 838 839 do_host(line); 840 } 841 842 if (ferror(fp)) 843 fatal("%s: %s: %s", __progname, argv[j], 844 strerror(errno)); 845 846 fclose(fp); 847 } 848 849 while (optind < argc) 850 do_host(argv[optind++]); 851 852 while (ncon > 0) 853 conloop(); 854 855 return (0); 856 } 857