1 /* $OpenBSD: ssh.c,v 1.490 2018/07/27 05:34:42 dtucker Exp $ */ 2 /* 3 * Author: Tatu Ylonen <ylo@cs.hut.fi> 4 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland 5 * All rights reserved 6 * Ssh client program. This program can be used to log into a remote machine. 7 * The software supports strong authentication, encryption, and forwarding 8 * of X11, TCP/IP, and authentication connections. 9 * 10 * As far as I am concerned, the code I have written for this software 11 * can be used freely for any purpose. Any derived versions of this 12 * software must be clearly marked as such, and if the derived work is 13 * incompatible with the protocol description in the RFC file, it must be 14 * called by a name other than "ssh" or "Secure Shell". 15 * 16 * Copyright (c) 1999 Niels Provos. All rights reserved. 17 * Copyright (c) 2000, 2001, 2002, 2003 Markus Friedl. All rights reserved. 18 * 19 * Modified to work with SSL by Niels Provos <provos@citi.umich.edu> 20 * in Canada (German citizen). 21 * 22 * Redistribution and use in source and binary forms, with or without 23 * modification, are permitted provided that the following conditions 24 * are met: 25 * 1. Redistributions of source code must retain the above copyright 26 * notice, this list of conditions and the following disclaimer. 27 * 2. Redistributions in binary form must reproduce the above copyright 28 * notice, this list of conditions and the following disclaimer in the 29 * documentation and/or other materials provided with the distribution. 30 * 31 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 32 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 33 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 34 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 35 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 36 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 37 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 38 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 39 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 40 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 41 */ 42 43 #include "includes.h" 44 __RCSID("$FreeBSD$"); 45 46 #include <sys/types.h> 47 #ifdef HAVE_SYS_STAT_H 48 # include <sys/stat.h> 49 #endif 50 #include <sys/resource.h> 51 #include <sys/ioctl.h> 52 #include <sys/socket.h> 53 #include <sys/wait.h> 54 55 #include <ctype.h> 56 #include <errno.h> 57 #include <fcntl.h> 58 #include <netdb.h> 59 #ifdef HAVE_PATHS_H 60 #include <paths.h> 61 #endif 62 #include <pwd.h> 63 #include <signal.h> 64 #include <stdarg.h> 65 #include <stddef.h> 66 #include <stdio.h> 67 #include <stdlib.h> 68 #include <string.h> 69 #include <unistd.h> 70 #include <limits.h> 71 #include <locale.h> 72 73 #include <netinet/in.h> 74 #include <arpa/inet.h> 75 76 #ifdef WITH_OPENSSL 77 #include <openssl/evp.h> 78 #include <openssl/err.h> 79 #endif 80 #include "openbsd-compat/openssl-compat.h" 81 #include "openbsd-compat/sys-queue.h" 82 83 #include "xmalloc.h" 84 #include "ssh.h" 85 #include "ssh2.h" 86 #include "canohost.h" 87 #include "compat.h" 88 #include "cipher.h" 89 #include "digest.h" 90 #include "packet.h" 91 #include "sshbuf.h" 92 #include "channels.h" 93 #include "sshkey.h" 94 #include "authfd.h" 95 #include "authfile.h" 96 #include "pathnames.h" 97 #include "dispatch.h" 98 #include "clientloop.h" 99 #include "log.h" 100 #include "misc.h" 101 #include "readconf.h" 102 #include "sshconnect.h" 103 #include "kex.h" 104 #include "mac.h" 105 #include "sshpty.h" 106 #include "match.h" 107 #include "msg.h" 108 #include "version.h" 109 #include "ssherr.h" 110 #include "myproposal.h" 111 #include "utf8.h" 112 113 #ifdef ENABLE_PKCS11 114 #include "ssh-pkcs11.h" 115 #endif 116 117 extern char *__progname; 118 119 /* Saves a copy of argv for setproctitle emulation */ 120 #ifndef HAVE_SETPROCTITLE 121 static char **saved_av; 122 #endif 123 124 /* Flag indicating whether debug mode is on. May be set on the command line. */ 125 int debug_flag = 0; 126 127 /* Flag indicating whether a tty should be requested */ 128 int tty_flag = 0; 129 130 /* don't exec a shell */ 131 int no_shell_flag = 0; 132 133 /* 134 * Flag indicating that nothing should be read from stdin. This can be set 135 * on the command line. 136 */ 137 int stdin_null_flag = 0; 138 139 /* 140 * Flag indicating that the current process should be backgrounded and 141 * a new slave launched in the foreground for ControlPersist. 142 */ 143 int need_controlpersist_detach = 0; 144 145 /* Copies of flags for ControlPersist foreground slave */ 146 int ostdin_null_flag, ono_shell_flag, otty_flag, orequest_tty; 147 148 /* 149 * Flag indicating that ssh should fork after authentication. This is useful 150 * so that the passphrase can be entered manually, and then ssh goes to the 151 * background. 152 */ 153 int fork_after_authentication_flag = 0; 154 155 /* 156 * General data structure for command line options and options configurable 157 * in configuration files. See readconf.h. 158 */ 159 Options options; 160 161 /* optional user configfile */ 162 char *config = NULL; 163 164 /* 165 * Name of the host we are connecting to. This is the name given on the 166 * command line, or the HostName specified for the user-supplied name in a 167 * configuration file. 168 */ 169 char *host; 170 171 /* Various strings used to to percent_expand() arguments */ 172 static char thishost[NI_MAXHOST], shorthost[NI_MAXHOST], portstr[NI_MAXSERV]; 173 static char uidstr[32], *host_arg, *conn_hash_hex; 174 175 /* socket address the host resolves to */ 176 struct sockaddr_storage hostaddr; 177 178 /* Private host keys. */ 179 Sensitive sensitive_data; 180 181 /* command to be executed */ 182 struct sshbuf *command; 183 184 /* Should we execute a command or invoke a subsystem? */ 185 int subsystem_flag = 0; 186 187 /* # of replies received for global requests */ 188 static int remote_forward_confirms_received = 0; 189 190 /* mux.c */ 191 extern int muxserver_sock; 192 extern u_int muxclient_command; 193 194 /* Prints a help message to the user. This function never returns. */ 195 196 static void 197 usage(void) 198 { 199 fprintf(stderr, 200 "usage: ssh [-46AaCfGgKkMNnqsTtVvXxYy] [-B bind_interface]\n" 201 " [-b bind_address] [-c cipher_spec] [-D [bind_address:]port]\n" 202 " [-E log_file] [-e escape_char] [-F configfile] [-I pkcs11]\n" 203 " [-i identity_file] [-J [user@]host[:port]] [-L address]\n" 204 " [-l login_name] [-m mac_spec] [-O ctl_cmd] [-o option] [-p port]\n" 205 " [-Q query_option] [-R address] [-S ctl_path] [-W host:port]\n" 206 " [-w local_tun[:remote_tun]] destination [command]\n" 207 ); 208 exit(255); 209 } 210 211 static int ssh_session2(struct ssh *, struct passwd *); 212 static void load_public_identity_files(struct passwd *); 213 static void main_sigchld_handler(int); 214 215 /* ~/ expand a list of paths. NB. assumes path[n] is heap-allocated. */ 216 static void 217 tilde_expand_paths(char **paths, u_int num_paths) 218 { 219 u_int i; 220 char *cp; 221 222 for (i = 0; i < num_paths; i++) { 223 cp = tilde_expand_filename(paths[i], getuid()); 224 free(paths[i]); 225 paths[i] = cp; 226 } 227 } 228 229 /* 230 * Attempt to resolve a host name / port to a set of addresses and 231 * optionally return any CNAMEs encountered along the way. 232 * Returns NULL on failure. 233 * NB. this function must operate with a options having undefined members. 234 */ 235 static struct addrinfo * 236 resolve_host(const char *name, int port, int logerr, char *cname, size_t clen) 237 { 238 char strport[NI_MAXSERV]; 239 struct addrinfo hints, *res; 240 int gaierr, loglevel = SYSLOG_LEVEL_DEBUG1; 241 242 if (port <= 0) 243 port = default_ssh_port(); 244 245 snprintf(strport, sizeof strport, "%d", port); 246 memset(&hints, 0, sizeof(hints)); 247 hints.ai_family = options.address_family == -1 ? 248 AF_UNSPEC : options.address_family; 249 hints.ai_socktype = SOCK_STREAM; 250 if (cname != NULL) 251 hints.ai_flags = AI_CANONNAME; 252 if ((gaierr = getaddrinfo(name, strport, &hints, &res)) != 0) { 253 if (logerr || (gaierr != EAI_NONAME && gaierr != EAI_NODATA)) 254 loglevel = SYSLOG_LEVEL_ERROR; 255 do_log2(loglevel, "%s: Could not resolve hostname %.100s: %s", 256 __progname, name, ssh_gai_strerror(gaierr)); 257 return NULL; 258 } 259 if (cname != NULL && res->ai_canonname != NULL) { 260 if (strlcpy(cname, res->ai_canonname, clen) >= clen) { 261 error("%s: host \"%s\" cname \"%s\" too long (max %lu)", 262 __func__, name, res->ai_canonname, (u_long)clen); 263 if (clen > 0) 264 *cname = '\0'; 265 } 266 } 267 return res; 268 } 269 270 /* Returns non-zero if name can only be an address and not a hostname */ 271 static int 272 is_addr_fast(const char *name) 273 { 274 return (strchr(name, '%') != NULL || strchr(name, ':') != NULL || 275 strspn(name, "0123456789.") == strlen(name)); 276 } 277 278 /* Returns non-zero if name represents a valid, single address */ 279 static int 280 is_addr(const char *name) 281 { 282 char strport[NI_MAXSERV]; 283 struct addrinfo hints, *res; 284 285 if (is_addr_fast(name)) 286 return 1; 287 288 snprintf(strport, sizeof strport, "%u", default_ssh_port()); 289 memset(&hints, 0, sizeof(hints)); 290 hints.ai_family = options.address_family == -1 ? 291 AF_UNSPEC : options.address_family; 292 hints.ai_socktype = SOCK_STREAM; 293 hints.ai_flags = AI_NUMERICHOST|AI_NUMERICSERV; 294 if (getaddrinfo(name, strport, &hints, &res) != 0) 295 return 0; 296 if (res == NULL || res->ai_next != NULL) { 297 freeaddrinfo(res); 298 return 0; 299 } 300 freeaddrinfo(res); 301 return 1; 302 } 303 304 /* 305 * Attempt to resolve a numeric host address / port to a single address. 306 * Returns a canonical address string. 307 * Returns NULL on failure. 308 * NB. this function must operate with a options having undefined members. 309 */ 310 static struct addrinfo * 311 resolve_addr(const char *name, int port, char *caddr, size_t clen) 312 { 313 char addr[NI_MAXHOST], strport[NI_MAXSERV]; 314 struct addrinfo hints, *res; 315 int gaierr; 316 317 if (port <= 0) 318 port = default_ssh_port(); 319 snprintf(strport, sizeof strport, "%u", port); 320 memset(&hints, 0, sizeof(hints)); 321 hints.ai_family = options.address_family == -1 ? 322 AF_UNSPEC : options.address_family; 323 hints.ai_socktype = SOCK_STREAM; 324 hints.ai_flags = AI_NUMERICHOST|AI_NUMERICSERV; 325 if ((gaierr = getaddrinfo(name, strport, &hints, &res)) != 0) { 326 debug2("%s: could not resolve name %.100s as address: %s", 327 __func__, name, ssh_gai_strerror(gaierr)); 328 return NULL; 329 } 330 if (res == NULL) { 331 debug("%s: getaddrinfo %.100s returned no addresses", 332 __func__, name); 333 return NULL; 334 } 335 if (res->ai_next != NULL) { 336 debug("%s: getaddrinfo %.100s returned multiple addresses", 337 __func__, name); 338 goto fail; 339 } 340 if ((gaierr = getnameinfo(res->ai_addr, res->ai_addrlen, 341 addr, sizeof(addr), NULL, 0, NI_NUMERICHOST)) != 0) { 342 debug("%s: Could not format address for name %.100s: %s", 343 __func__, name, ssh_gai_strerror(gaierr)); 344 goto fail; 345 } 346 if (strlcpy(caddr, addr, clen) >= clen) { 347 error("%s: host \"%s\" addr \"%s\" too long (max %lu)", 348 __func__, name, addr, (u_long)clen); 349 if (clen > 0) 350 *caddr = '\0'; 351 fail: 352 freeaddrinfo(res); 353 return NULL; 354 } 355 return res; 356 } 357 358 /* 359 * Check whether the cname is a permitted replacement for the hostname 360 * and perform the replacement if it is. 361 * NB. this function must operate with a options having undefined members. 362 */ 363 static int 364 check_follow_cname(int direct, char **namep, const char *cname) 365 { 366 int i; 367 struct allowed_cname *rule; 368 369 if (*cname == '\0' || options.num_permitted_cnames == 0 || 370 strcmp(*namep, cname) == 0) 371 return 0; 372 if (options.canonicalize_hostname == SSH_CANONICALISE_NO) 373 return 0; 374 /* 375 * Don't attempt to canonicalize names that will be interpreted by 376 * a proxy or jump host unless the user specifically requests so. 377 */ 378 if (!direct && 379 options.canonicalize_hostname != SSH_CANONICALISE_ALWAYS) 380 return 0; 381 debug3("%s: check \"%s\" CNAME \"%s\"", __func__, *namep, cname); 382 for (i = 0; i < options.num_permitted_cnames; i++) { 383 rule = options.permitted_cnames + i; 384 if (match_pattern_list(*namep, rule->source_list, 1) != 1 || 385 match_pattern_list(cname, rule->target_list, 1) != 1) 386 continue; 387 verbose("Canonicalized DNS aliased hostname " 388 "\"%s\" => \"%s\"", *namep, cname); 389 free(*namep); 390 *namep = xstrdup(cname); 391 return 1; 392 } 393 return 0; 394 } 395 396 /* 397 * Attempt to resolve the supplied hostname after applying the user's 398 * canonicalization rules. Returns the address list for the host or NULL 399 * if no name was found after canonicalization. 400 * NB. this function must operate with a options having undefined members. 401 */ 402 static struct addrinfo * 403 resolve_canonicalize(char **hostp, int port) 404 { 405 int i, direct, ndots; 406 char *cp, *fullhost, newname[NI_MAXHOST]; 407 struct addrinfo *addrs; 408 409 /* 410 * Attempt to canonicalise addresses, regardless of 411 * whether hostname canonicalisation was requested 412 */ 413 if ((addrs = resolve_addr(*hostp, port, 414 newname, sizeof(newname))) != NULL) { 415 debug2("%s: hostname %.100s is address", __func__, *hostp); 416 if (strcasecmp(*hostp, newname) != 0) { 417 debug2("%s: canonicalised address \"%s\" => \"%s\"", 418 __func__, *hostp, newname); 419 free(*hostp); 420 *hostp = xstrdup(newname); 421 } 422 return addrs; 423 } 424 425 /* 426 * If this looks like an address but didn't parse as one, it might 427 * be an address with an invalid interface scope. Skip further 428 * attempts at canonicalisation. 429 */ 430 if (is_addr_fast(*hostp)) { 431 debug("%s: hostname %.100s is an unrecognised address", 432 __func__, *hostp); 433 return NULL; 434 } 435 436 if (options.canonicalize_hostname == SSH_CANONICALISE_NO) 437 return NULL; 438 439 /* 440 * Don't attempt to canonicalize names that will be interpreted by 441 * a proxy unless the user specifically requests so. 442 */ 443 direct = option_clear_or_none(options.proxy_command) && 444 options.jump_host == NULL; 445 if (!direct && 446 options.canonicalize_hostname != SSH_CANONICALISE_ALWAYS) 447 return NULL; 448 449 /* If domain name is anchored, then resolve it now */ 450 if ((*hostp)[strlen(*hostp) - 1] == '.') { 451 debug3("%s: name is fully qualified", __func__); 452 fullhost = xstrdup(*hostp); 453 if ((addrs = resolve_host(fullhost, port, 0, 454 newname, sizeof(newname))) != NULL) 455 goto found; 456 free(fullhost); 457 goto notfound; 458 } 459 460 /* Don't apply canonicalization to sufficiently-qualified hostnames */ 461 ndots = 0; 462 for (cp = *hostp; *cp != '\0'; cp++) { 463 if (*cp == '.') 464 ndots++; 465 } 466 if (ndots > options.canonicalize_max_dots) { 467 debug3("%s: not canonicalizing hostname \"%s\" (max dots %d)", 468 __func__, *hostp, options.canonicalize_max_dots); 469 return NULL; 470 } 471 /* Attempt each supplied suffix */ 472 for (i = 0; i < options.num_canonical_domains; i++) { 473 *newname = '\0'; 474 xasprintf(&fullhost, "%s.%s.", *hostp, 475 options.canonical_domains[i]); 476 debug3("%s: attempting \"%s\" => \"%s\"", __func__, 477 *hostp, fullhost); 478 if ((addrs = resolve_host(fullhost, port, 0, 479 newname, sizeof(newname))) == NULL) { 480 free(fullhost); 481 continue; 482 } 483 found: 484 /* Remove trailing '.' */ 485 fullhost[strlen(fullhost) - 1] = '\0'; 486 /* Follow CNAME if requested */ 487 if (!check_follow_cname(direct, &fullhost, newname)) { 488 debug("Canonicalized hostname \"%s\" => \"%s\"", 489 *hostp, fullhost); 490 } 491 free(*hostp); 492 *hostp = fullhost; 493 return addrs; 494 } 495 notfound: 496 if (!options.canonicalize_fallback_local) 497 fatal("%s: Could not resolve host \"%s\"", __progname, *hostp); 498 debug2("%s: host %s not found in any suffix", __func__, *hostp); 499 return NULL; 500 } 501 502 /* 503 * Check the result of hostkey loading, ignoring some errors and 504 * fatal()ing for others. 505 */ 506 static void 507 check_load(int r, const char *path, const char *message) 508 { 509 switch (r) { 510 case 0: 511 break; 512 case SSH_ERR_INTERNAL_ERROR: 513 case SSH_ERR_ALLOC_FAIL: 514 fatal("load %s \"%s\": %s", message, path, ssh_err(r)); 515 case SSH_ERR_SYSTEM_ERROR: 516 /* Ignore missing files */ 517 if (errno == ENOENT) 518 break; 519 /* FALLTHROUGH */ 520 default: 521 error("load %s \"%s\": %s", message, path, ssh_err(r)); 522 break; 523 } 524 } 525 526 /* 527 * Read per-user configuration file. Ignore the system wide config 528 * file if the user specifies a config file on the command line. 529 */ 530 static void 531 process_config_files(const char *host_name, struct passwd *pw, int post_canon) 532 { 533 char buf[PATH_MAX]; 534 int r; 535 536 if (config != NULL) { 537 if (strcasecmp(config, "none") != 0 && 538 !read_config_file(config, pw, host, host_name, &options, 539 SSHCONF_USERCONF | (post_canon ? SSHCONF_POSTCANON : 0))) 540 fatal("Can't open user config file %.100s: " 541 "%.100s", config, strerror(errno)); 542 } else { 543 r = snprintf(buf, sizeof buf, "%s/%s", pw->pw_dir, 544 _PATH_SSH_USER_CONFFILE); 545 if (r > 0 && (size_t)r < sizeof(buf)) 546 (void)read_config_file(buf, pw, host, host_name, 547 &options, SSHCONF_CHECKPERM | SSHCONF_USERCONF | 548 (post_canon ? SSHCONF_POSTCANON : 0)); 549 550 /* Read systemwide configuration file after user config. */ 551 (void)read_config_file(_PATH_HOST_CONFIG_FILE, pw, 552 host, host_name, &options, 553 post_canon ? SSHCONF_POSTCANON : 0); 554 } 555 } 556 557 /* Rewrite the port number in an addrinfo list of addresses */ 558 static void 559 set_addrinfo_port(struct addrinfo *addrs, int port) 560 { 561 struct addrinfo *addr; 562 563 for (addr = addrs; addr != NULL; addr = addr->ai_next) { 564 switch (addr->ai_family) { 565 case AF_INET: 566 ((struct sockaddr_in *)addr->ai_addr)-> 567 sin_port = htons(port); 568 break; 569 case AF_INET6: 570 ((struct sockaddr_in6 *)addr->ai_addr)-> 571 sin6_port = htons(port); 572 break; 573 } 574 } 575 } 576 577 /* 578 * Main program for the ssh client. 579 */ 580 int 581 main(int ac, char **av) 582 { 583 struct ssh *ssh = NULL; 584 int i, r, opt, exit_status, use_syslog, direct, timeout_ms; 585 int was_addr, config_test = 0, opt_terminated = 0; 586 char *p, *cp, *line, *argv0, buf[PATH_MAX], *logfile; 587 char cname[NI_MAXHOST]; 588 struct stat st; 589 struct passwd *pw; 590 extern int optind, optreset; 591 extern char *optarg; 592 struct Forward fwd; 593 struct addrinfo *addrs = NULL; 594 struct ssh_digest_ctx *md; 595 u_char conn_hash[SSH_DIGEST_MAX_LENGTH]; 596 597 ssh_malloc_init(); /* must be called before any mallocs */ 598 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ 599 sanitise_stdfd(); 600 601 __progname = ssh_get_progname(av[0]); 602 603 #ifndef HAVE_SETPROCTITLE 604 /* Prepare for later setproctitle emulation */ 605 /* Save argv so it isn't clobbered by setproctitle() emulation */ 606 saved_av = xcalloc(ac + 1, sizeof(*saved_av)); 607 for (i = 0; i < ac; i++) 608 saved_av[i] = xstrdup(av[i]); 609 saved_av[i] = NULL; 610 compat_init_setproctitle(ac, av); 611 av = saved_av; 612 #endif 613 614 /* 615 * Discard other fds that are hanging around. These can cause problem 616 * with backgrounded ssh processes started by ControlPersist. 617 */ 618 closefrom(STDERR_FILENO + 1); 619 620 /* Get user data. */ 621 pw = getpwuid(getuid()); 622 if (!pw) { 623 logit("No user exists for uid %lu", (u_long)getuid()); 624 exit(255); 625 } 626 /* Take a copy of the returned structure. */ 627 pw = pwcopy(pw); 628 629 /* 630 * Set our umask to something reasonable, as some files are created 631 * with the default umask. This will make them world-readable but 632 * writable only by the owner, which is ok for all files for which we 633 * don't set the modes explicitly. 634 */ 635 umask(022); 636 637 msetlocale(); 638 639 /* 640 * Initialize option structure to indicate that no values have been 641 * set. 642 */ 643 initialize_options(&options); 644 645 /* 646 * Prepare main ssh transport/connection structures 647 */ 648 if ((ssh = ssh_alloc_session_state()) == NULL) 649 fatal("Couldn't allocate session state"); 650 channel_init_channels(ssh); 651 active_state = ssh; /* XXX legacy API compat */ 652 653 /* Parse command-line arguments. */ 654 host = NULL; 655 use_syslog = 0; 656 logfile = NULL; 657 argv0 = av[0]; 658 659 again: 660 while ((opt = getopt(ac, av, "1246ab:c:e:fgi:kl:m:no:p:qstvx" 661 "AB:CD:E:F:GI:J:KL:MNO:PQ:R:S:TVw:W:XYy")) != -1) { 662 switch (opt) { 663 case '1': 664 fatal("SSH protocol v.1 is no longer supported"); 665 break; 666 case '2': 667 /* Ignored */ 668 break; 669 case '4': 670 options.address_family = AF_INET; 671 break; 672 case '6': 673 options.address_family = AF_INET6; 674 break; 675 case 'n': 676 stdin_null_flag = 1; 677 break; 678 case 'f': 679 fork_after_authentication_flag = 1; 680 stdin_null_flag = 1; 681 break; 682 case 'x': 683 options.forward_x11 = 0; 684 break; 685 case 'X': 686 options.forward_x11 = 1; 687 break; 688 case 'y': 689 use_syslog = 1; 690 break; 691 case 'E': 692 logfile = optarg; 693 break; 694 case 'G': 695 config_test = 1; 696 break; 697 case 'Y': 698 options.forward_x11 = 1; 699 options.forward_x11_trusted = 1; 700 break; 701 case 'g': 702 options.fwd_opts.gateway_ports = 1; 703 break; 704 case 'O': 705 if (options.stdio_forward_host != NULL) 706 fatal("Cannot specify multiplexing " 707 "command with -W"); 708 else if (muxclient_command != 0) 709 fatal("Multiplexing command already specified"); 710 if (strcmp(optarg, "check") == 0) 711 muxclient_command = SSHMUX_COMMAND_ALIVE_CHECK; 712 else if (strcmp(optarg, "forward") == 0) 713 muxclient_command = SSHMUX_COMMAND_FORWARD; 714 else if (strcmp(optarg, "exit") == 0) 715 muxclient_command = SSHMUX_COMMAND_TERMINATE; 716 else if (strcmp(optarg, "stop") == 0) 717 muxclient_command = SSHMUX_COMMAND_STOP; 718 else if (strcmp(optarg, "cancel") == 0) 719 muxclient_command = SSHMUX_COMMAND_CANCEL_FWD; 720 else if (strcmp(optarg, "proxy") == 0) 721 muxclient_command = SSHMUX_COMMAND_PROXY; 722 else 723 fatal("Invalid multiplex command."); 724 break; 725 case 'P': /* deprecated */ 726 break; 727 case 'Q': 728 cp = NULL; 729 if (strcmp(optarg, "cipher") == 0) 730 cp = cipher_alg_list('\n', 0); 731 else if (strcmp(optarg, "cipher-auth") == 0) 732 cp = cipher_alg_list('\n', 1); 733 else if (strcmp(optarg, "mac") == 0) 734 cp = mac_alg_list('\n'); 735 else if (strcmp(optarg, "kex") == 0) 736 cp = kex_alg_list('\n'); 737 else if (strcmp(optarg, "key") == 0) 738 cp = sshkey_alg_list(0, 0, 0, '\n'); 739 else if (strcmp(optarg, "key-cert") == 0) 740 cp = sshkey_alg_list(1, 0, 0, '\n'); 741 else if (strcmp(optarg, "key-plain") == 0) 742 cp = sshkey_alg_list(0, 1, 0, '\n'); 743 else if (strcmp(optarg, "protocol-version") == 0) { 744 cp = xstrdup("2"); 745 } 746 if (cp == NULL) 747 fatal("Unsupported query \"%s\"", optarg); 748 printf("%s\n", cp); 749 free(cp); 750 exit(0); 751 break; 752 case 'a': 753 options.forward_agent = 0; 754 break; 755 case 'A': 756 options.forward_agent = 1; 757 break; 758 case 'k': 759 options.gss_deleg_creds = 0; 760 break; 761 case 'K': 762 options.gss_authentication = 1; 763 options.gss_deleg_creds = 1; 764 break; 765 case 'i': 766 p = tilde_expand_filename(optarg, getuid()); 767 if (stat(p, &st) < 0) 768 fprintf(stderr, "Warning: Identity file %s " 769 "not accessible: %s.\n", p, 770 strerror(errno)); 771 else 772 add_identity_file(&options, NULL, p, 1); 773 free(p); 774 break; 775 case 'I': 776 #ifdef ENABLE_PKCS11 777 free(options.pkcs11_provider); 778 options.pkcs11_provider = xstrdup(optarg); 779 #else 780 fprintf(stderr, "no support for PKCS#11.\n"); 781 #endif 782 break; 783 case 'J': 784 if (options.jump_host != NULL) 785 fatal("Only a single -J option permitted"); 786 if (options.proxy_command != NULL) 787 fatal("Cannot specify -J with ProxyCommand"); 788 if (parse_jump(optarg, &options, 1) == -1) 789 fatal("Invalid -J argument"); 790 options.proxy_command = xstrdup("none"); 791 break; 792 case 't': 793 if (options.request_tty == REQUEST_TTY_YES) 794 options.request_tty = REQUEST_TTY_FORCE; 795 else 796 options.request_tty = REQUEST_TTY_YES; 797 break; 798 case 'v': 799 if (debug_flag == 0) { 800 debug_flag = 1; 801 options.log_level = SYSLOG_LEVEL_DEBUG1; 802 } else { 803 if (options.log_level < SYSLOG_LEVEL_DEBUG3) { 804 debug_flag++; 805 options.log_level++; 806 } 807 } 808 break; 809 case 'V': 810 if (options.version_addendum && 811 *options.version_addendum != '\0') 812 fprintf(stderr, "%s %s, %s\n", SSH_RELEASE, 813 options.version_addendum, 814 OPENSSL_VERSION_STRING); 815 else 816 fprintf(stderr, "%s, %s\n", SSH_RELEASE, 817 OPENSSL_VERSION_STRING); 818 if (opt == 'V') 819 exit(0); 820 break; 821 case 'w': 822 if (options.tun_open == -1) 823 options.tun_open = SSH_TUNMODE_DEFAULT; 824 options.tun_local = a2tun(optarg, &options.tun_remote); 825 if (options.tun_local == SSH_TUNID_ERR) { 826 fprintf(stderr, 827 "Bad tun device '%s'\n", optarg); 828 exit(255); 829 } 830 break; 831 case 'W': 832 if (options.stdio_forward_host != NULL) 833 fatal("stdio forward already specified"); 834 if (muxclient_command != 0) 835 fatal("Cannot specify stdio forward with -O"); 836 if (parse_forward(&fwd, optarg, 1, 0)) { 837 options.stdio_forward_host = fwd.listen_host; 838 options.stdio_forward_port = fwd.listen_port; 839 free(fwd.connect_host); 840 } else { 841 fprintf(stderr, 842 "Bad stdio forwarding specification '%s'\n", 843 optarg); 844 exit(255); 845 } 846 options.request_tty = REQUEST_TTY_NO; 847 no_shell_flag = 1; 848 break; 849 case 'q': 850 options.log_level = SYSLOG_LEVEL_QUIET; 851 break; 852 case 'e': 853 if (optarg[0] == '^' && optarg[2] == 0 && 854 (u_char) optarg[1] >= 64 && 855 (u_char) optarg[1] < 128) 856 options.escape_char = (u_char) optarg[1] & 31; 857 else if (strlen(optarg) == 1) 858 options.escape_char = (u_char) optarg[0]; 859 else if (strcmp(optarg, "none") == 0) 860 options.escape_char = SSH_ESCAPECHAR_NONE; 861 else { 862 fprintf(stderr, "Bad escape character '%s'.\n", 863 optarg); 864 exit(255); 865 } 866 break; 867 case 'c': 868 if (!ciphers_valid(*optarg == '+' ? 869 optarg + 1 : optarg)) { 870 fprintf(stderr, "Unknown cipher type '%s'\n", 871 optarg); 872 exit(255); 873 } 874 free(options.ciphers); 875 options.ciphers = xstrdup(optarg); 876 break; 877 case 'm': 878 if (mac_valid(optarg)) { 879 free(options.macs); 880 options.macs = xstrdup(optarg); 881 } else { 882 fprintf(stderr, "Unknown mac type '%s'\n", 883 optarg); 884 exit(255); 885 } 886 break; 887 case 'M': 888 if (options.control_master == SSHCTL_MASTER_YES) 889 options.control_master = SSHCTL_MASTER_ASK; 890 else 891 options.control_master = SSHCTL_MASTER_YES; 892 break; 893 case 'p': 894 if (options.port == -1) { 895 options.port = a2port(optarg); 896 if (options.port <= 0) { 897 fprintf(stderr, "Bad port '%s'\n", 898 optarg); 899 exit(255); 900 } 901 } 902 break; 903 case 'l': 904 if (options.user == NULL) 905 options.user = optarg; 906 break; 907 908 case 'L': 909 if (parse_forward(&fwd, optarg, 0, 0)) 910 add_local_forward(&options, &fwd); 911 else { 912 fprintf(stderr, 913 "Bad local forwarding specification '%s'\n", 914 optarg); 915 exit(255); 916 } 917 break; 918 919 case 'R': 920 if (parse_forward(&fwd, optarg, 0, 1) || 921 parse_forward(&fwd, optarg, 1, 1)) { 922 add_remote_forward(&options, &fwd); 923 } else { 924 fprintf(stderr, 925 "Bad remote forwarding specification " 926 "'%s'\n", optarg); 927 exit(255); 928 } 929 break; 930 931 case 'D': 932 if (parse_forward(&fwd, optarg, 1, 0)) { 933 add_local_forward(&options, &fwd); 934 } else { 935 fprintf(stderr, 936 "Bad dynamic forwarding specification " 937 "'%s'\n", optarg); 938 exit(255); 939 } 940 break; 941 942 case 'C': 943 options.compression = 1; 944 break; 945 case 'N': 946 no_shell_flag = 1; 947 options.request_tty = REQUEST_TTY_NO; 948 break; 949 case 'T': 950 options.request_tty = REQUEST_TTY_NO; 951 break; 952 case 'o': 953 line = xstrdup(optarg); 954 if (process_config_line(&options, pw, 955 host ? host : "", host ? host : "", line, 956 "command-line", 0, NULL, SSHCONF_USERCONF) != 0) 957 exit(255); 958 free(line); 959 break; 960 case 's': 961 subsystem_flag = 1; 962 break; 963 case 'S': 964 free(options.control_path); 965 options.control_path = xstrdup(optarg); 966 break; 967 case 'b': 968 options.bind_address = optarg; 969 break; 970 case 'B': 971 options.bind_interface = optarg; 972 break; 973 case 'F': 974 config = optarg; 975 break; 976 default: 977 usage(); 978 } 979 } 980 981 if (optind > 1 && strcmp(av[optind - 1], "--") == 0) 982 opt_terminated = 1; 983 984 ac -= optind; 985 av += optind; 986 987 if (ac > 0 && !host) { 988 int tport; 989 char *tuser; 990 switch (parse_ssh_uri(*av, &tuser, &host, &tport)) { 991 case -1: 992 usage(); 993 break; 994 case 0: 995 if (options.user == NULL) { 996 options.user = tuser; 997 tuser = NULL; 998 } 999 free(tuser); 1000 if (options.port == -1 && tport != -1) 1001 options.port = tport; 1002 break; 1003 default: 1004 p = xstrdup(*av); 1005 cp = strrchr(p, '@'); 1006 if (cp != NULL) { 1007 if (cp == p) 1008 usage(); 1009 if (options.user == NULL) { 1010 options.user = p; 1011 p = NULL; 1012 } 1013 *cp++ = '\0'; 1014 host = xstrdup(cp); 1015 free(p); 1016 } else 1017 host = p; 1018 break; 1019 } 1020 if (ac > 1 && !opt_terminated) { 1021 optind = optreset = 1; 1022 goto again; 1023 } 1024 ac--, av++; 1025 } 1026 1027 /* Check that we got a host name. */ 1028 if (!host) 1029 usage(); 1030 1031 host_arg = xstrdup(host); 1032 1033 #ifdef WITH_OPENSSL 1034 OpenSSL_add_all_algorithms(); 1035 ERR_load_crypto_strings(); 1036 #endif 1037 1038 /* Initialize the command to execute on remote host. */ 1039 if ((command = sshbuf_new()) == NULL) 1040 fatal("sshbuf_new failed"); 1041 1042 /* 1043 * Save the command to execute on the remote host in a buffer. There 1044 * is no limit on the length of the command, except by the maximum 1045 * packet size. Also sets the tty flag if there is no command. 1046 */ 1047 if (!ac) { 1048 /* No command specified - execute shell on a tty. */ 1049 if (subsystem_flag) { 1050 fprintf(stderr, 1051 "You must specify a subsystem to invoke.\n"); 1052 usage(); 1053 } 1054 } else { 1055 /* A command has been specified. Store it into the buffer. */ 1056 for (i = 0; i < ac; i++) { 1057 if ((r = sshbuf_putf(command, "%s%s", 1058 i ? " " : "", av[i])) != 0) 1059 fatal("%s: buffer error: %s", 1060 __func__, ssh_err(r)); 1061 } 1062 } 1063 1064 /* 1065 * Initialize "log" output. Since we are the client all output 1066 * goes to stderr unless otherwise specified by -y or -E. 1067 */ 1068 if (use_syslog && logfile != NULL) 1069 fatal("Can't specify both -y and -E"); 1070 if (logfile != NULL) 1071 log_redirect_stderr_to(logfile); 1072 log_init(argv0, 1073 options.log_level == SYSLOG_LEVEL_NOT_SET ? 1074 SYSLOG_LEVEL_INFO : options.log_level, 1075 options.log_facility == SYSLOG_FACILITY_NOT_SET ? 1076 SYSLOG_FACILITY_USER : options.log_facility, 1077 !use_syslog); 1078 1079 if (debug_flag) 1080 /* version_addendum is always NULL at this point */ 1081 logit("%s, %s", SSH_RELEASE, OPENSSL_VERSION_STRING); 1082 1083 /* Parse the configuration files */ 1084 process_config_files(host_arg, pw, 0); 1085 1086 /* Hostname canonicalisation needs a few options filled. */ 1087 fill_default_options_for_canonicalization(&options); 1088 1089 /* If the user has replaced the hostname then take it into use now */ 1090 if (options.hostname != NULL) { 1091 /* NB. Please keep in sync with readconf.c:match_cfg_line() */ 1092 cp = percent_expand(options.hostname, 1093 "h", host, (char *)NULL); 1094 free(host); 1095 host = cp; 1096 free(options.hostname); 1097 options.hostname = xstrdup(host); 1098 } 1099 1100 /* Don't lowercase addresses, they will be explicitly canonicalised */ 1101 if ((was_addr = is_addr(host)) == 0) 1102 lowercase(host); 1103 1104 /* 1105 * Try to canonicalize if requested by configuration or the 1106 * hostname is an address. 1107 */ 1108 if (options.canonicalize_hostname != SSH_CANONICALISE_NO || was_addr) 1109 addrs = resolve_canonicalize(&host, options.port); 1110 1111 /* 1112 * If CanonicalizePermittedCNAMEs have been specified but 1113 * other canonicalization did not happen (by not being requested 1114 * or by failing with fallback) then the hostname may still be changed 1115 * as a result of CNAME following. 1116 * 1117 * Try to resolve the bare hostname name using the system resolver's 1118 * usual search rules and then apply the CNAME follow rules. 1119 * 1120 * Skip the lookup if a ProxyCommand is being used unless the user 1121 * has specifically requested canonicalisation for this case via 1122 * CanonicalizeHostname=always 1123 */ 1124 direct = option_clear_or_none(options.proxy_command) && 1125 options.jump_host == NULL; 1126 if (addrs == NULL && options.num_permitted_cnames != 0 && (direct || 1127 options.canonicalize_hostname == SSH_CANONICALISE_ALWAYS)) { 1128 if ((addrs = resolve_host(host, options.port, 1129 option_clear_or_none(options.proxy_command), 1130 cname, sizeof(cname))) == NULL) { 1131 /* Don't fatal proxied host names not in the DNS */ 1132 if (option_clear_or_none(options.proxy_command)) 1133 cleanup_exit(255); /* logged in resolve_host */ 1134 } else 1135 check_follow_cname(direct, &host, cname); 1136 } 1137 1138 /* 1139 * If canonicalisation is enabled then re-parse the configuration 1140 * files as new stanzas may match. 1141 */ 1142 if (options.canonicalize_hostname != 0) { 1143 debug("Re-reading configuration after hostname " 1144 "canonicalisation"); 1145 free(options.hostname); 1146 options.hostname = xstrdup(host); 1147 process_config_files(host_arg, pw, 1); 1148 /* 1149 * Address resolution happens early with canonicalisation 1150 * enabled and the port number may have changed since, so 1151 * reset it in address list 1152 */ 1153 if (addrs != NULL && options.port > 0) 1154 set_addrinfo_port(addrs, options.port); 1155 } 1156 1157 /* Fill configuration defaults. */ 1158 fill_default_options(&options); 1159 1160 /* 1161 * If ProxyJump option specified, then construct a ProxyCommand now. 1162 */ 1163 if (options.jump_host != NULL) { 1164 char port_s[8]; 1165 const char *sshbin = argv0; 1166 1167 /* 1168 * Try to use SSH indicated by argv[0], but fall back to 1169 * "ssh" if it appears unavailable. 1170 */ 1171 if (strchr(argv0, '/') != NULL && access(argv0, X_OK) != 0) 1172 sshbin = "ssh"; 1173 1174 /* Consistency check */ 1175 if (options.proxy_command != NULL) 1176 fatal("inconsistent options: ProxyCommand+ProxyJump"); 1177 /* Never use FD passing for ProxyJump */ 1178 options.proxy_use_fdpass = 0; 1179 snprintf(port_s, sizeof(port_s), "%d", options.jump_port); 1180 xasprintf(&options.proxy_command, 1181 "%s%s%s%s%s%s%s%s%s%s%.*s -W '[%%h]:%%p' %s", 1182 sshbin, 1183 /* Optional "-l user" argument if jump_user set */ 1184 options.jump_user == NULL ? "" : " -l ", 1185 options.jump_user == NULL ? "" : options.jump_user, 1186 /* Optional "-p port" argument if jump_port set */ 1187 options.jump_port <= 0 ? "" : " -p ", 1188 options.jump_port <= 0 ? "" : port_s, 1189 /* Optional additional jump hosts ",..." */ 1190 options.jump_extra == NULL ? "" : " -J ", 1191 options.jump_extra == NULL ? "" : options.jump_extra, 1192 /* Optional "-F" argumment if -F specified */ 1193 config == NULL ? "" : " -F ", 1194 config == NULL ? "" : config, 1195 /* Optional "-v" arguments if -v set */ 1196 debug_flag ? " -" : "", 1197 debug_flag, "vvv", 1198 /* Mandatory hostname */ 1199 options.jump_host); 1200 debug("Setting implicit ProxyCommand from ProxyJump: %s", 1201 options.proxy_command); 1202 } 1203 1204 if (options.port == 0) 1205 options.port = default_ssh_port(); 1206 channel_set_af(ssh, options.address_family); 1207 1208 /* Tidy and check options */ 1209 if (options.host_key_alias != NULL) 1210 lowercase(options.host_key_alias); 1211 if (options.proxy_command != NULL && 1212 strcmp(options.proxy_command, "-") == 0 && 1213 options.proxy_use_fdpass) 1214 fatal("ProxyCommand=- and ProxyUseFDPass are incompatible"); 1215 if (options.control_persist && 1216 options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK) { 1217 debug("UpdateHostKeys=ask is incompatible with ControlPersist; " 1218 "disabling"); 1219 options.update_hostkeys = 0; 1220 } 1221 if (options.connection_attempts <= 0) 1222 fatal("Invalid number of ConnectionAttempts"); 1223 1224 if (sshbuf_len(command) != 0 && options.remote_command != NULL) 1225 fatal("Cannot execute command-line and remote command."); 1226 1227 /* Cannot fork to background if no command. */ 1228 if (fork_after_authentication_flag && sshbuf_len(command) == 0 && 1229 options.remote_command == NULL && !no_shell_flag) 1230 fatal("Cannot fork into background without a command " 1231 "to execute."); 1232 1233 /* reinit */ 1234 log_init(argv0, options.log_level, options.log_facility, !use_syslog); 1235 1236 if (options.request_tty == REQUEST_TTY_YES || 1237 options.request_tty == REQUEST_TTY_FORCE) 1238 tty_flag = 1; 1239 1240 /* Allocate a tty by default if no command specified. */ 1241 if (sshbuf_len(command) == 0 && options.remote_command == NULL) 1242 tty_flag = options.request_tty != REQUEST_TTY_NO; 1243 1244 /* Force no tty */ 1245 if (options.request_tty == REQUEST_TTY_NO || 1246 (muxclient_command && muxclient_command != SSHMUX_COMMAND_PROXY)) 1247 tty_flag = 0; 1248 /* Do not allocate a tty if stdin is not a tty. */ 1249 if ((!isatty(fileno(stdin)) || stdin_null_flag) && 1250 options.request_tty != REQUEST_TTY_FORCE) { 1251 if (tty_flag) 1252 logit("Pseudo-terminal will not be allocated because " 1253 "stdin is not a terminal."); 1254 tty_flag = 0; 1255 } 1256 1257 seed_rng(); 1258 1259 if (options.user == NULL) 1260 options.user = xstrdup(pw->pw_name); 1261 1262 /* Set up strings used to percent_expand() arguments */ 1263 if (gethostname(thishost, sizeof(thishost)) == -1) 1264 fatal("gethostname: %s", strerror(errno)); 1265 strlcpy(shorthost, thishost, sizeof(shorthost)); 1266 shorthost[strcspn(thishost, ".")] = '\0'; 1267 snprintf(portstr, sizeof(portstr), "%d", options.port); 1268 snprintf(uidstr, sizeof(uidstr), "%llu", 1269 (unsigned long long)pw->pw_uid); 1270 1271 /* Find canonic host name. */ 1272 if (strchr(host, '.') == 0) { 1273 struct addrinfo hints; 1274 struct addrinfo *ai = NULL; 1275 int errgai; 1276 memset(&hints, 0, sizeof(hints)); 1277 hints.ai_family = options.address_family; 1278 hints.ai_flags = AI_CANONNAME; 1279 hints.ai_socktype = SOCK_STREAM; 1280 errgai = getaddrinfo(host, NULL, &hints, &ai); 1281 if (errgai == 0) { 1282 if (ai->ai_canonname != NULL) 1283 host = xstrdup(ai->ai_canonname); 1284 freeaddrinfo(ai); 1285 } 1286 } 1287 1288 if ((md = ssh_digest_start(SSH_DIGEST_SHA1)) == NULL || 1289 ssh_digest_update(md, thishost, strlen(thishost)) < 0 || 1290 ssh_digest_update(md, host, strlen(host)) < 0 || 1291 ssh_digest_update(md, portstr, strlen(portstr)) < 0 || 1292 ssh_digest_update(md, options.user, strlen(options.user)) < 0 || 1293 ssh_digest_final(md, conn_hash, sizeof(conn_hash)) < 0) 1294 fatal("%s: mux digest failed", __func__); 1295 ssh_digest_free(md); 1296 conn_hash_hex = tohex(conn_hash, ssh_digest_bytes(SSH_DIGEST_SHA1)); 1297 1298 /* 1299 * Expand tokens in arguments. NB. LocalCommand is expanded later, 1300 * after port-forwarding is set up, so it may pick up any local 1301 * tunnel interface name allocated. 1302 */ 1303 if (options.remote_command != NULL) { 1304 debug3("expanding RemoteCommand: %s", options.remote_command); 1305 cp = options.remote_command; 1306 options.remote_command = percent_expand(cp, 1307 "C", conn_hash_hex, 1308 "L", shorthost, 1309 "d", pw->pw_dir, 1310 "h", host, 1311 "i", uidstr, 1312 "l", thishost, 1313 "n", host_arg, 1314 "p", portstr, 1315 "r", options.user, 1316 "u", pw->pw_name, 1317 (char *)NULL); 1318 debug3("expanded RemoteCommand: %s", options.remote_command); 1319 free(cp); 1320 if ((r = sshbuf_put(command, options.remote_command, 1321 strlen(options.remote_command))) != 0) 1322 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 1323 } 1324 1325 if (options.control_path != NULL) { 1326 cp = tilde_expand_filename(options.control_path, getuid()); 1327 free(options.control_path); 1328 options.control_path = percent_expand(cp, 1329 "C", conn_hash_hex, 1330 "L", shorthost, 1331 "h", host, 1332 "i", uidstr, 1333 "l", thishost, 1334 "n", host_arg, 1335 "p", portstr, 1336 "r", options.user, 1337 "u", pw->pw_name, 1338 "i", uidstr, 1339 (char *)NULL); 1340 free(cp); 1341 } 1342 1343 if (config_test) { 1344 dump_client_config(&options, host); 1345 exit(0); 1346 } 1347 1348 if (muxclient_command != 0 && options.control_path == NULL) 1349 fatal("No ControlPath specified for \"-O\" command"); 1350 if (options.control_path != NULL) { 1351 int sock; 1352 if ((sock = muxclient(options.control_path)) >= 0) { 1353 ssh_packet_set_connection(ssh, sock, sock); 1354 packet_set_mux(); 1355 goto skip_connect; 1356 } 1357 } 1358 1359 /* 1360 * If hostname canonicalisation was not enabled, then we may not 1361 * have yet resolved the hostname. Do so now. 1362 */ 1363 if (addrs == NULL && options.proxy_command == NULL) { 1364 debug2("resolving \"%s\" port %d", host, options.port); 1365 if ((addrs = resolve_host(host, options.port, 1, 1366 cname, sizeof(cname))) == NULL) 1367 cleanup_exit(255); /* resolve_host logs the error */ 1368 } 1369 1370 timeout_ms = options.connection_timeout * 1000; 1371 1372 /* Open a connection to the remote host. */ 1373 if (ssh_connect(ssh, host, addrs, &hostaddr, options.port, 1374 options.address_family, options.connection_attempts, 1375 &timeout_ms, options.tcp_keep_alive) != 0) 1376 exit(255); 1377 1378 if (addrs != NULL) 1379 freeaddrinfo(addrs); 1380 1381 packet_set_timeout(options.server_alive_interval, 1382 options.server_alive_count_max); 1383 1384 ssh = active_state; /* XXX */ 1385 1386 if (timeout_ms > 0) 1387 debug3("timeout: %d ms remain after connect", timeout_ms); 1388 1389 /* 1390 * If we successfully made the connection and we have hostbased auth 1391 * enabled, load the public keys so we can later use the ssh-keysign 1392 * helper to sign challenges. 1393 */ 1394 sensitive_data.nkeys = 0; 1395 sensitive_data.keys = NULL; 1396 if (options.hostbased_authentication) { 1397 sensitive_data.nkeys = 10; 1398 sensitive_data.keys = xcalloc(sensitive_data.nkeys, 1399 sizeof(struct sshkey)); 1400 1401 /* XXX check errors? */ 1402 #define L_PUBKEY(p,o) do { \ 1403 if ((o) >= sensitive_data.nkeys) \ 1404 fatal("%s pubkey out of array bounds", __func__); \ 1405 check_load(sshkey_load_public(p, &(sensitive_data.keys[o]), NULL), \ 1406 p, "pubkey"); \ 1407 } while (0) 1408 #define L_CERT(p,o) do { \ 1409 if ((o) >= sensitive_data.nkeys) \ 1410 fatal("%s cert out of array bounds", __func__); \ 1411 check_load(sshkey_load_cert(p, &(sensitive_data.keys[o])), p, "cert"); \ 1412 } while (0) 1413 1414 if (options.hostbased_authentication == 1) { 1415 L_CERT(_PATH_HOST_ECDSA_KEY_FILE, 0); 1416 L_CERT(_PATH_HOST_ED25519_KEY_FILE, 1); 1417 L_CERT(_PATH_HOST_RSA_KEY_FILE, 2); 1418 L_CERT(_PATH_HOST_DSA_KEY_FILE, 3); 1419 L_PUBKEY(_PATH_HOST_ECDSA_KEY_FILE, 4); 1420 L_PUBKEY(_PATH_HOST_ED25519_KEY_FILE, 5); 1421 L_PUBKEY(_PATH_HOST_RSA_KEY_FILE, 6); 1422 L_PUBKEY(_PATH_HOST_DSA_KEY_FILE, 7); 1423 L_CERT(_PATH_HOST_XMSS_KEY_FILE, 8); 1424 L_PUBKEY(_PATH_HOST_XMSS_KEY_FILE, 9); 1425 } 1426 } 1427 1428 /* Create ~/.ssh * directory if it doesn't already exist. */ 1429 if (config == NULL) { 1430 r = snprintf(buf, sizeof buf, "%s%s%s", pw->pw_dir, 1431 strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR); 1432 if (r > 0 && (size_t)r < sizeof(buf) && stat(buf, &st) < 0) { 1433 #ifdef WITH_SELINUX 1434 ssh_selinux_setfscreatecon(buf); 1435 #endif 1436 if (mkdir(buf, 0700) < 0) 1437 error("Could not create directory '%.200s'.", 1438 buf); 1439 #ifdef WITH_SELINUX 1440 ssh_selinux_setfscreatecon(NULL); 1441 #endif 1442 } 1443 } 1444 /* load options.identity_files */ 1445 load_public_identity_files(pw); 1446 1447 /* optionally set the SSH_AUTHSOCKET_ENV_NAME variable */ 1448 if (options.identity_agent && 1449 strcmp(options.identity_agent, SSH_AUTHSOCKET_ENV_NAME) != 0) { 1450 if (strcmp(options.identity_agent, "none") == 0) { 1451 unsetenv(SSH_AUTHSOCKET_ENV_NAME); 1452 } else { 1453 p = tilde_expand_filename(options.identity_agent, 1454 getuid()); 1455 cp = percent_expand(p, 1456 "d", pw->pw_dir, 1457 "h", host, 1458 "i", uidstr, 1459 "l", thishost, 1460 "r", options.user, 1461 "u", pw->pw_name, 1462 (char *)NULL); 1463 setenv(SSH_AUTHSOCKET_ENV_NAME, cp, 1); 1464 free(cp); 1465 free(p); 1466 } 1467 } 1468 1469 /* Expand ~ in known host file names. */ 1470 tilde_expand_paths(options.system_hostfiles, 1471 options.num_system_hostfiles); 1472 tilde_expand_paths(options.user_hostfiles, options.num_user_hostfiles); 1473 1474 signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */ 1475 signal(SIGCHLD, main_sigchld_handler); 1476 1477 /* Log into the remote system. Never returns if the login fails. */ 1478 ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr, 1479 options.port, pw, timeout_ms); 1480 1481 if (packet_connection_is_on_socket()) { 1482 verbose("Authenticated to %s ([%s]:%d).", host, 1483 ssh_remote_ipaddr(ssh), ssh_remote_port(ssh)); 1484 } else { 1485 verbose("Authenticated to %s (via proxy).", host); 1486 } 1487 1488 /* We no longer need the private host keys. Clear them now. */ 1489 if (sensitive_data.nkeys != 0) { 1490 for (i = 0; i < sensitive_data.nkeys; i++) { 1491 if (sensitive_data.keys[i] != NULL) { 1492 /* Destroys contents safely */ 1493 debug3("clear hostkey %d", i); 1494 sshkey_free(sensitive_data.keys[i]); 1495 sensitive_data.keys[i] = NULL; 1496 } 1497 } 1498 free(sensitive_data.keys); 1499 } 1500 for (i = 0; i < options.num_identity_files; i++) { 1501 free(options.identity_files[i]); 1502 options.identity_files[i] = NULL; 1503 if (options.identity_keys[i]) { 1504 sshkey_free(options.identity_keys[i]); 1505 options.identity_keys[i] = NULL; 1506 } 1507 } 1508 for (i = 0; i < options.num_certificate_files; i++) { 1509 free(options.certificate_files[i]); 1510 options.certificate_files[i] = NULL; 1511 } 1512 1513 skip_connect: 1514 exit_status = ssh_session2(ssh, pw); 1515 packet_close(); 1516 1517 if (options.control_path != NULL && muxserver_sock != -1) 1518 unlink(options.control_path); 1519 1520 /* Kill ProxyCommand if it is running. */ 1521 ssh_kill_proxy_command(); 1522 1523 return exit_status; 1524 } 1525 1526 static void 1527 control_persist_detach(void) 1528 { 1529 pid_t pid; 1530 int devnull, keep_stderr; 1531 1532 debug("%s: backgrounding master process", __func__); 1533 1534 /* 1535 * master (current process) into the background, and make the 1536 * foreground process a client of the backgrounded master. 1537 */ 1538 switch ((pid = fork())) { 1539 case -1: 1540 fatal("%s: fork: %s", __func__, strerror(errno)); 1541 case 0: 1542 /* Child: master process continues mainloop */ 1543 break; 1544 default: 1545 /* Parent: set up mux slave to connect to backgrounded master */ 1546 debug2("%s: background process is %ld", __func__, (long)pid); 1547 stdin_null_flag = ostdin_null_flag; 1548 options.request_tty = orequest_tty; 1549 tty_flag = otty_flag; 1550 close(muxserver_sock); 1551 muxserver_sock = -1; 1552 options.control_master = SSHCTL_MASTER_NO; 1553 muxclient(options.control_path); 1554 /* muxclient() doesn't return on success. */ 1555 fatal("Failed to connect to new control master"); 1556 } 1557 if ((devnull = open(_PATH_DEVNULL, O_RDWR)) == -1) { 1558 error("%s: open(\"/dev/null\"): %s", __func__, 1559 strerror(errno)); 1560 } else { 1561 keep_stderr = log_is_on_stderr() && debug_flag; 1562 if (dup2(devnull, STDIN_FILENO) == -1 || 1563 dup2(devnull, STDOUT_FILENO) == -1 || 1564 (!keep_stderr && dup2(devnull, STDERR_FILENO) == -1)) 1565 error("%s: dup2: %s", __func__, strerror(errno)); 1566 if (devnull > STDERR_FILENO) 1567 close(devnull); 1568 } 1569 daemon(1, 1); 1570 setproctitle("%s [mux]", options.control_path); 1571 } 1572 1573 /* Do fork() after authentication. Used by "ssh -f" */ 1574 static void 1575 fork_postauth(void) 1576 { 1577 if (need_controlpersist_detach) 1578 control_persist_detach(); 1579 debug("forking to background"); 1580 fork_after_authentication_flag = 0; 1581 if (daemon(1, 1) < 0) 1582 fatal("daemon() failed: %.200s", strerror(errno)); 1583 } 1584 1585 /* Callback for remote forward global requests */ 1586 static void 1587 ssh_confirm_remote_forward(struct ssh *ssh, int type, u_int32_t seq, void *ctxt) 1588 { 1589 struct Forward *rfwd = (struct Forward *)ctxt; 1590 1591 /* XXX verbose() on failure? */ 1592 debug("remote forward %s for: listen %s%s%d, connect %s:%d", 1593 type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure", 1594 rfwd->listen_path ? rfwd->listen_path : 1595 rfwd->listen_host ? rfwd->listen_host : "", 1596 (rfwd->listen_path || rfwd->listen_host) ? ":" : "", 1597 rfwd->listen_port, rfwd->connect_path ? rfwd->connect_path : 1598 rfwd->connect_host, rfwd->connect_port); 1599 if (rfwd->listen_path == NULL && rfwd->listen_port == 0) { 1600 if (type == SSH2_MSG_REQUEST_SUCCESS) { 1601 rfwd->allocated_port = packet_get_int(); 1602 logit("Allocated port %u for remote forward to %s:%d", 1603 rfwd->allocated_port, 1604 rfwd->connect_host, rfwd->connect_port); 1605 channel_update_permission(ssh, 1606 rfwd->handle, rfwd->allocated_port); 1607 } else { 1608 channel_update_permission(ssh, rfwd->handle, -1); 1609 } 1610 } 1611 1612 if (type == SSH2_MSG_REQUEST_FAILURE) { 1613 if (options.exit_on_forward_failure) { 1614 if (rfwd->listen_path != NULL) 1615 fatal("Error: remote port forwarding failed " 1616 "for listen path %s", rfwd->listen_path); 1617 else 1618 fatal("Error: remote port forwarding failed " 1619 "for listen port %d", rfwd->listen_port); 1620 } else { 1621 if (rfwd->listen_path != NULL) 1622 logit("Warning: remote port forwarding failed " 1623 "for listen path %s", rfwd->listen_path); 1624 else 1625 logit("Warning: remote port forwarding failed " 1626 "for listen port %d", rfwd->listen_port); 1627 } 1628 } 1629 if (++remote_forward_confirms_received == options.num_remote_forwards) { 1630 debug("All remote forwarding requests processed"); 1631 if (fork_after_authentication_flag) 1632 fork_postauth(); 1633 } 1634 } 1635 1636 static void 1637 client_cleanup_stdio_fwd(struct ssh *ssh, int id, void *arg) 1638 { 1639 debug("stdio forwarding: done"); 1640 cleanup_exit(0); 1641 } 1642 1643 static void 1644 ssh_stdio_confirm(struct ssh *ssh, int id, int success, void *arg) 1645 { 1646 if (!success) 1647 fatal("stdio forwarding failed"); 1648 } 1649 1650 static void 1651 ssh_init_stdio_forwarding(struct ssh *ssh) 1652 { 1653 Channel *c; 1654 int in, out; 1655 1656 if (options.stdio_forward_host == NULL) 1657 return; 1658 1659 debug3("%s: %s:%d", __func__, options.stdio_forward_host, 1660 options.stdio_forward_port); 1661 1662 if ((in = dup(STDIN_FILENO)) < 0 || 1663 (out = dup(STDOUT_FILENO)) < 0) 1664 fatal("channel_connect_stdio_fwd: dup() in/out failed"); 1665 if ((c = channel_connect_stdio_fwd(ssh, options.stdio_forward_host, 1666 options.stdio_forward_port, in, out)) == NULL) 1667 fatal("%s: channel_connect_stdio_fwd failed", __func__); 1668 channel_register_cleanup(ssh, c->self, client_cleanup_stdio_fwd, 0); 1669 channel_register_open_confirm(ssh, c->self, ssh_stdio_confirm, NULL); 1670 } 1671 1672 static void 1673 ssh_init_forwarding(struct ssh *ssh, char **ifname) 1674 { 1675 int success = 0; 1676 int i; 1677 1678 /* Initiate local TCP/IP port forwardings. */ 1679 for (i = 0; i < options.num_local_forwards; i++) { 1680 debug("Local connections to %.200s:%d forwarded to remote " 1681 "address %.200s:%d", 1682 (options.local_forwards[i].listen_path != NULL) ? 1683 options.local_forwards[i].listen_path : 1684 (options.local_forwards[i].listen_host == NULL) ? 1685 (options.fwd_opts.gateway_ports ? "*" : "LOCALHOST") : 1686 options.local_forwards[i].listen_host, 1687 options.local_forwards[i].listen_port, 1688 (options.local_forwards[i].connect_path != NULL) ? 1689 options.local_forwards[i].connect_path : 1690 options.local_forwards[i].connect_host, 1691 options.local_forwards[i].connect_port); 1692 success += channel_setup_local_fwd_listener(ssh, 1693 &options.local_forwards[i], &options.fwd_opts); 1694 } 1695 if (i > 0 && success != i && options.exit_on_forward_failure) 1696 fatal("Could not request local forwarding."); 1697 if (i > 0 && success == 0) 1698 error("Could not request local forwarding."); 1699 1700 /* Initiate remote TCP/IP port forwardings. */ 1701 for (i = 0; i < options.num_remote_forwards; i++) { 1702 debug("Remote connections from %.200s:%d forwarded to " 1703 "local address %.200s:%d", 1704 (options.remote_forwards[i].listen_path != NULL) ? 1705 options.remote_forwards[i].listen_path : 1706 (options.remote_forwards[i].listen_host == NULL) ? 1707 "LOCALHOST" : options.remote_forwards[i].listen_host, 1708 options.remote_forwards[i].listen_port, 1709 (options.remote_forwards[i].connect_path != NULL) ? 1710 options.remote_forwards[i].connect_path : 1711 options.remote_forwards[i].connect_host, 1712 options.remote_forwards[i].connect_port); 1713 options.remote_forwards[i].handle = 1714 channel_request_remote_forwarding(ssh, 1715 &options.remote_forwards[i]); 1716 if (options.remote_forwards[i].handle < 0) { 1717 if (options.exit_on_forward_failure) 1718 fatal("Could not request remote forwarding."); 1719 else 1720 logit("Warning: Could not request remote " 1721 "forwarding."); 1722 } else { 1723 client_register_global_confirm( 1724 ssh_confirm_remote_forward, 1725 &options.remote_forwards[i]); 1726 } 1727 } 1728 1729 /* Initiate tunnel forwarding. */ 1730 if (options.tun_open != SSH_TUNMODE_NO) { 1731 if ((*ifname = client_request_tun_fwd(ssh, 1732 options.tun_open, options.tun_local, 1733 options.tun_remote)) == NULL) { 1734 if (options.exit_on_forward_failure) 1735 fatal("Could not request tunnel forwarding."); 1736 else 1737 error("Could not request tunnel forwarding."); 1738 } 1739 } 1740 } 1741 1742 static void 1743 check_agent_present(void) 1744 { 1745 int r; 1746 1747 if (options.forward_agent) { 1748 /* Clear agent forwarding if we don't have an agent. */ 1749 if ((r = ssh_get_authentication_socket(NULL)) != 0) { 1750 options.forward_agent = 0; 1751 if (r != SSH_ERR_AGENT_NOT_PRESENT) 1752 debug("ssh_get_authentication_socket: %s", 1753 ssh_err(r)); 1754 } 1755 } 1756 } 1757 1758 static void 1759 ssh_session2_setup(struct ssh *ssh, int id, int success, void *arg) 1760 { 1761 extern char **environ; 1762 const char *display; 1763 int interactive = tty_flag; 1764 char *proto = NULL, *data = NULL; 1765 1766 if (!success) 1767 return; /* No need for error message, channels code sens one */ 1768 1769 display = getenv("DISPLAY"); 1770 if (display == NULL && options.forward_x11) 1771 debug("X11 forwarding requested but DISPLAY not set"); 1772 if (options.forward_x11 && client_x11_get_proto(ssh, display, 1773 options.xauth_location, options.forward_x11_trusted, 1774 options.forward_x11_timeout, &proto, &data) == 0) { 1775 /* Request forwarding with authentication spoofing. */ 1776 debug("Requesting X11 forwarding with authentication " 1777 "spoofing."); 1778 x11_request_forwarding_with_spoofing(ssh, id, display, proto, 1779 data, 1); 1780 client_expect_confirm(ssh, id, "X11 forwarding", CONFIRM_WARN); 1781 /* XXX exit_on_forward_failure */ 1782 interactive = 1; 1783 } 1784 1785 check_agent_present(); 1786 if (options.forward_agent) { 1787 debug("Requesting authentication agent forwarding."); 1788 channel_request_start(ssh, id, "auth-agent-req@openssh.com", 0); 1789 packet_send(); 1790 } 1791 1792 /* Tell the packet module whether this is an interactive session. */ 1793 packet_set_interactive(interactive, 1794 options.ip_qos_interactive, options.ip_qos_bulk); 1795 1796 client_session2_setup(ssh, id, tty_flag, subsystem_flag, getenv("TERM"), 1797 NULL, fileno(stdin), command, environ); 1798 } 1799 1800 /* open new channel for a session */ 1801 static int 1802 ssh_session2_open(struct ssh *ssh) 1803 { 1804 Channel *c; 1805 int window, packetmax, in, out, err; 1806 1807 if (stdin_null_flag) { 1808 in = open(_PATH_DEVNULL, O_RDONLY); 1809 } else { 1810 in = dup(STDIN_FILENO); 1811 } 1812 out = dup(STDOUT_FILENO); 1813 err = dup(STDERR_FILENO); 1814 1815 if (in < 0 || out < 0 || err < 0) 1816 fatal("dup() in/out/err failed"); 1817 1818 /* enable nonblocking unless tty */ 1819 if (!isatty(in)) 1820 set_nonblock(in); 1821 if (!isatty(out)) 1822 set_nonblock(out); 1823 if (!isatty(err)) 1824 set_nonblock(err); 1825 1826 window = CHAN_SES_WINDOW_DEFAULT; 1827 packetmax = CHAN_SES_PACKET_DEFAULT; 1828 if (tty_flag) { 1829 window >>= 1; 1830 packetmax >>= 1; 1831 } 1832 c = channel_new(ssh, 1833 "session", SSH_CHANNEL_OPENING, in, out, err, 1834 window, packetmax, CHAN_EXTENDED_WRITE, 1835 "client-session", /*nonblock*/0); 1836 1837 debug3("%s: channel_new: %d", __func__, c->self); 1838 1839 channel_send_open(ssh, c->self); 1840 if (!no_shell_flag) 1841 channel_register_open_confirm(ssh, c->self, 1842 ssh_session2_setup, NULL); 1843 1844 return c->self; 1845 } 1846 1847 static int 1848 ssh_session2(struct ssh *ssh, struct passwd *pw) 1849 { 1850 int devnull, id = -1; 1851 char *cp, *tun_fwd_ifname = NULL; 1852 1853 /* XXX should be pre-session */ 1854 if (!options.control_persist) 1855 ssh_init_stdio_forwarding(ssh); 1856 1857 ssh_init_forwarding(ssh, &tun_fwd_ifname); 1858 1859 if (options.local_command != NULL) { 1860 debug3("expanding LocalCommand: %s", options.local_command); 1861 cp = options.local_command; 1862 options.local_command = percent_expand(cp, 1863 "C", conn_hash_hex, 1864 "L", shorthost, 1865 "d", pw->pw_dir, 1866 "h", host, 1867 "i", uidstr, 1868 "l", thishost, 1869 "n", host_arg, 1870 "p", portstr, 1871 "r", options.user, 1872 "u", pw->pw_name, 1873 "T", tun_fwd_ifname == NULL ? "NONE" : tun_fwd_ifname, 1874 (char *)NULL); 1875 debug3("expanded LocalCommand: %s", options.local_command); 1876 free(cp); 1877 } 1878 1879 /* Start listening for multiplex clients */ 1880 if (!packet_get_mux()) 1881 muxserver_listen(ssh); 1882 1883 /* 1884 * If we are in control persist mode and have a working mux listen 1885 * socket, then prepare to background ourselves and have a foreground 1886 * client attach as a control slave. 1887 * NB. we must save copies of the flags that we override for 1888 * the backgrounding, since we defer attachment of the slave until 1889 * after the connection is fully established (in particular, 1890 * async rfwd replies have been received for ExitOnForwardFailure). 1891 */ 1892 if (options.control_persist && muxserver_sock != -1) { 1893 ostdin_null_flag = stdin_null_flag; 1894 ono_shell_flag = no_shell_flag; 1895 orequest_tty = options.request_tty; 1896 otty_flag = tty_flag; 1897 stdin_null_flag = 1; 1898 no_shell_flag = 1; 1899 tty_flag = 0; 1900 if (!fork_after_authentication_flag) 1901 need_controlpersist_detach = 1; 1902 fork_after_authentication_flag = 1; 1903 } 1904 /* 1905 * ControlPersist mux listen socket setup failed, attempt the 1906 * stdio forward setup that we skipped earlier. 1907 */ 1908 if (options.control_persist && muxserver_sock == -1) 1909 ssh_init_stdio_forwarding(ssh); 1910 1911 if (!no_shell_flag) 1912 id = ssh_session2_open(ssh); 1913 else { 1914 packet_set_interactive( 1915 options.control_master == SSHCTL_MASTER_NO, 1916 options.ip_qos_interactive, options.ip_qos_bulk); 1917 } 1918 1919 /* If we don't expect to open a new session, then disallow it */ 1920 if (options.control_master == SSHCTL_MASTER_NO && 1921 (datafellows & SSH_NEW_OPENSSH)) { 1922 debug("Requesting no-more-sessions@openssh.com"); 1923 packet_start(SSH2_MSG_GLOBAL_REQUEST); 1924 packet_put_cstring("no-more-sessions@openssh.com"); 1925 packet_put_char(0); 1926 packet_send(); 1927 } 1928 1929 /* Execute a local command */ 1930 if (options.local_command != NULL && 1931 options.permit_local_command) 1932 ssh_local_cmd(options.local_command); 1933 1934 /* 1935 * stdout is now owned by the session channel; clobber it here 1936 * so future channel closes are propagated to the local fd. 1937 * NB. this can only happen after LocalCommand has completed, 1938 * as it may want to write to stdout. 1939 */ 1940 if (!need_controlpersist_detach) { 1941 if ((devnull = open(_PATH_DEVNULL, O_WRONLY)) == -1) 1942 error("%s: open %s: %s", __func__, 1943 _PATH_DEVNULL, strerror(errno)); 1944 if (dup2(devnull, STDOUT_FILENO) < 0) 1945 fatal("%s: dup2() stdout failed", __func__); 1946 if (devnull > STDERR_FILENO) 1947 close(devnull); 1948 } 1949 1950 /* 1951 * If requested and we are not interested in replies to remote 1952 * forwarding requests, then let ssh continue in the background. 1953 */ 1954 if (fork_after_authentication_flag) { 1955 if (options.exit_on_forward_failure && 1956 options.num_remote_forwards > 0) { 1957 debug("deferring postauth fork until remote forward " 1958 "confirmation received"); 1959 } else 1960 fork_postauth(); 1961 } 1962 1963 return client_loop(ssh, tty_flag, tty_flag ? 1964 options.escape_char : SSH_ESCAPECHAR_NONE, id); 1965 } 1966 1967 /* Loads all IdentityFile and CertificateFile keys */ 1968 static void 1969 load_public_identity_files(struct passwd *pw) 1970 { 1971 char *filename, *cp; 1972 struct sshkey *public; 1973 int i; 1974 u_int n_ids, n_certs; 1975 char *identity_files[SSH_MAX_IDENTITY_FILES]; 1976 struct sshkey *identity_keys[SSH_MAX_IDENTITY_FILES]; 1977 int identity_file_userprovided[SSH_MAX_IDENTITY_FILES]; 1978 char *certificate_files[SSH_MAX_CERTIFICATE_FILES]; 1979 struct sshkey *certificates[SSH_MAX_CERTIFICATE_FILES]; 1980 int certificate_file_userprovided[SSH_MAX_CERTIFICATE_FILES]; 1981 #ifdef ENABLE_PKCS11 1982 struct sshkey **keys; 1983 int nkeys; 1984 #endif /* PKCS11 */ 1985 1986 n_ids = n_certs = 0; 1987 memset(identity_files, 0, sizeof(identity_files)); 1988 memset(identity_keys, 0, sizeof(identity_keys)); 1989 memset(identity_file_userprovided, 0, 1990 sizeof(identity_file_userprovided)); 1991 memset(certificate_files, 0, sizeof(certificate_files)); 1992 memset(certificates, 0, sizeof(certificates)); 1993 memset(certificate_file_userprovided, 0, 1994 sizeof(certificate_file_userprovided)); 1995 1996 #ifdef ENABLE_PKCS11 1997 if (options.pkcs11_provider != NULL && 1998 options.num_identity_files < SSH_MAX_IDENTITY_FILES && 1999 (pkcs11_init(!options.batch_mode) == 0) && 2000 (nkeys = pkcs11_add_provider(options.pkcs11_provider, NULL, 2001 &keys)) > 0) { 2002 for (i = 0; i < nkeys; i++) { 2003 if (n_ids >= SSH_MAX_IDENTITY_FILES) { 2004 sshkey_free(keys[i]); 2005 continue; 2006 } 2007 identity_keys[n_ids] = keys[i]; 2008 identity_files[n_ids] = 2009 xstrdup(options.pkcs11_provider); /* XXX */ 2010 n_ids++; 2011 } 2012 free(keys); 2013 } 2014 #endif /* ENABLE_PKCS11 */ 2015 for (i = 0; i < options.num_identity_files; i++) { 2016 if (n_ids >= SSH_MAX_IDENTITY_FILES || 2017 strcasecmp(options.identity_files[i], "none") == 0) { 2018 free(options.identity_files[i]); 2019 options.identity_files[i] = NULL; 2020 continue; 2021 } 2022 cp = tilde_expand_filename(options.identity_files[i], getuid()); 2023 filename = percent_expand(cp, "d", pw->pw_dir, 2024 "u", pw->pw_name, "l", thishost, "h", host, 2025 "r", options.user, (char *)NULL); 2026 free(cp); 2027 check_load(sshkey_load_public(filename, &public, NULL), 2028 filename, "pubkey"); 2029 debug("identity file %s type %d", filename, 2030 public ? public->type : -1); 2031 free(options.identity_files[i]); 2032 identity_files[n_ids] = filename; 2033 identity_keys[n_ids] = public; 2034 identity_file_userprovided[n_ids] = 2035 options.identity_file_userprovided[i]; 2036 if (++n_ids >= SSH_MAX_IDENTITY_FILES) 2037 continue; 2038 2039 /* 2040 * If no certificates have been explicitly listed then try 2041 * to add the default certificate variant too. 2042 */ 2043 if (options.num_certificate_files != 0) 2044 continue; 2045 xasprintf(&cp, "%s-cert", filename); 2046 check_load(sshkey_load_public(cp, &public, NULL), 2047 filename, "pubkey"); 2048 debug("identity file %s type %d", cp, 2049 public ? public->type : -1); 2050 if (public == NULL) { 2051 free(cp); 2052 continue; 2053 } 2054 if (!sshkey_is_cert(public)) { 2055 debug("%s: key %s type %s is not a certificate", 2056 __func__, cp, sshkey_type(public)); 2057 sshkey_free(public); 2058 free(cp); 2059 continue; 2060 } 2061 /* NB. leave filename pointing to private key */ 2062 identity_files[n_ids] = xstrdup(filename); 2063 identity_keys[n_ids] = public; 2064 identity_file_userprovided[n_ids] = 2065 options.identity_file_userprovided[i]; 2066 n_ids++; 2067 } 2068 2069 if (options.num_certificate_files > SSH_MAX_CERTIFICATE_FILES) 2070 fatal("%s: too many certificates", __func__); 2071 for (i = 0; i < options.num_certificate_files; i++) { 2072 cp = tilde_expand_filename(options.certificate_files[i], 2073 getuid()); 2074 filename = percent_expand(cp, 2075 "d", pw->pw_dir, 2076 "h", host, 2077 "i", uidstr, 2078 "l", thishost, 2079 "r", options.user, 2080 "u", pw->pw_name, 2081 (char *)NULL); 2082 free(cp); 2083 2084 check_load(sshkey_load_public(filename, &public, NULL), 2085 filename, "certificate"); 2086 debug("certificate file %s type %d", filename, 2087 public ? public->type : -1); 2088 free(options.certificate_files[i]); 2089 options.certificate_files[i] = NULL; 2090 if (public == NULL) { 2091 free(filename); 2092 continue; 2093 } 2094 if (!sshkey_is_cert(public)) { 2095 debug("%s: key %s type %s is not a certificate", 2096 __func__, filename, sshkey_type(public)); 2097 sshkey_free(public); 2098 free(filename); 2099 continue; 2100 } 2101 certificate_files[n_certs] = filename; 2102 certificates[n_certs] = public; 2103 certificate_file_userprovided[n_certs] = 2104 options.certificate_file_userprovided[i]; 2105 ++n_certs; 2106 } 2107 2108 options.num_identity_files = n_ids; 2109 memcpy(options.identity_files, identity_files, sizeof(identity_files)); 2110 memcpy(options.identity_keys, identity_keys, sizeof(identity_keys)); 2111 memcpy(options.identity_file_userprovided, 2112 identity_file_userprovided, sizeof(identity_file_userprovided)); 2113 2114 options.num_certificate_files = n_certs; 2115 memcpy(options.certificate_files, 2116 certificate_files, sizeof(certificate_files)); 2117 memcpy(options.certificates, certificates, sizeof(certificates)); 2118 memcpy(options.certificate_file_userprovided, 2119 certificate_file_userprovided, 2120 sizeof(certificate_file_userprovided)); 2121 } 2122 2123 static void 2124 main_sigchld_handler(int sig) 2125 { 2126 int save_errno = errno; 2127 pid_t pid; 2128 int status; 2129 2130 while ((pid = waitpid(-1, &status, WNOHANG)) > 0 || 2131 (pid < 0 && errno == EINTR)) 2132 ; 2133 errno = save_errno; 2134 } 2135