1 /* $OpenBSD: ssh.c,v 1.335 2010/02/26 20:29:54 djm 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/param.h> 53 #include <sys/socket.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 71 #include <netinet/in.h> 72 #include <arpa/inet.h> 73 74 #include <openssl/evp.h> 75 #include <openssl/err.h> 76 #include "openbsd-compat/openssl-compat.h" 77 #include "openbsd-compat/sys-queue.h" 78 79 #include "xmalloc.h" 80 #include "ssh.h" 81 #include "ssh1.h" 82 #include "ssh2.h" 83 #include "compat.h" 84 #include "cipher.h" 85 #include "packet.h" 86 #include "buffer.h" 87 #include "channels.h" 88 #include "key.h" 89 #include "authfd.h" 90 #include "authfile.h" 91 #include "pathnames.h" 92 #include "dispatch.h" 93 #include "clientloop.h" 94 #include "log.h" 95 #include "readconf.h" 96 #include "sshconnect.h" 97 #include "misc.h" 98 #include "kex.h" 99 #include "mac.h" 100 #include "sshpty.h" 101 #include "match.h" 102 #include "msg.h" 103 #include "uidswap.h" 104 #include "roaming.h" 105 #include "version.h" 106 107 #ifdef ENABLE_PKCS11 108 #include "ssh-pkcs11.h" 109 #endif 110 111 extern char *__progname; 112 113 /* Flag indicating whether debug mode is on. May be set on the command line. */ 114 int debug_flag = 0; 115 116 /* Flag indicating whether a tty should be allocated */ 117 int tty_flag = 0; 118 int no_tty_flag = 0; 119 int force_tty_flag = 0; 120 121 /* don't exec a shell */ 122 int no_shell_flag = 0; 123 124 /* 125 * Flag indicating that nothing should be read from stdin. This can be set 126 * on the command line. 127 */ 128 int stdin_null_flag = 0; 129 130 /* 131 * Flag indicating that ssh should fork after authentication. This is useful 132 * so that the passphrase can be entered manually, and then ssh goes to the 133 * background. 134 */ 135 int fork_after_authentication_flag = 0; 136 137 /* forward stdio to remote host and port */ 138 char *stdio_forward_host = NULL; 139 int stdio_forward_port = 0; 140 141 /* 142 * General data structure for command line options and options configurable 143 * in configuration files. See readconf.h. 144 */ 145 Options options; 146 147 /* optional user configfile */ 148 char *config = NULL; 149 150 /* 151 * Name of the host we are connecting to. This is the name given on the 152 * command line, or the HostName specified for the user-supplied name in a 153 * configuration file. 154 */ 155 char *host; 156 157 /* socket address the host resolves to */ 158 struct sockaddr_storage hostaddr; 159 160 /* Private host keys. */ 161 Sensitive sensitive_data; 162 163 /* Original real UID. */ 164 uid_t original_real_uid; 165 uid_t original_effective_uid; 166 167 /* command to be executed */ 168 Buffer command; 169 170 /* Should we execute a command or invoke a subsystem? */ 171 int subsystem_flag = 0; 172 173 /* # of replies received for global requests */ 174 static int remote_forward_confirms_received = 0; 175 176 /* pid of proxycommand child process */ 177 pid_t proxy_command_pid = 0; 178 179 /* mux.c */ 180 extern int muxserver_sock; 181 extern u_int muxclient_command; 182 183 /* Prints a help message to the user. This function never returns. */ 184 185 static void 186 usage(void) 187 { 188 fprintf(stderr, 189 "usage: ssh [-1246AaCfgKkMNnqsTtVvXxYy] [-b bind_address] [-c cipher_spec]\n" 190 " [-D [bind_address:]port] [-e escape_char] [-F configfile]\n" 191 " [-I pkcs11] [-i identity_file]\n" 192 " [-L [bind_address:]port:host:hostport]\n" 193 " [-l login_name] [-m mac_spec] [-O ctl_cmd] [-o option] [-p port]\n" 194 " [-R [bind_address:]port:host:hostport] [-S ctl_path]\n" 195 " [-W host:port] [-w local_tun[:remote_tun]]\n" 196 " [user@]hostname [command]\n" 197 ); 198 exit(255); 199 } 200 201 static int ssh_session(void); 202 static int ssh_session2(void); 203 static void load_public_identity_files(void); 204 205 /* from muxclient.c */ 206 void muxclient(const char *); 207 void muxserver_listen(void); 208 209 /* 210 * Main program for the ssh client. 211 */ 212 int 213 main(int ac, char **av) 214 { 215 int i, r, opt, exit_status, use_syslog; 216 char *p, *cp, *line, *argv0, buf[MAXPATHLEN]; 217 struct stat st; 218 struct passwd *pw; 219 int dummy, timeout_ms; 220 extern int optind, optreset; 221 extern char *optarg; 222 struct servent *sp; 223 Forward fwd; 224 225 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ 226 sanitise_stdfd(); 227 228 __progname = ssh_get_progname(av[0]); 229 init_rng(); 230 231 /* 232 * Save the original real uid. It will be needed later (uid-swapping 233 * may clobber the real uid). 234 */ 235 original_real_uid = getuid(); 236 original_effective_uid = geteuid(); 237 238 /* 239 * Use uid-swapping to give up root privileges for the duration of 240 * option processing. We will re-instantiate the rights when we are 241 * ready to create the privileged port, and will permanently drop 242 * them when the port has been created (actually, when the connection 243 * has been made, as we may need to create the port several times). 244 */ 245 PRIV_END; 246 247 #ifdef HAVE_SETRLIMIT 248 /* If we are installed setuid root be careful to not drop core. */ 249 if (original_real_uid != original_effective_uid) { 250 struct rlimit rlim; 251 rlim.rlim_cur = rlim.rlim_max = 0; 252 if (setrlimit(RLIMIT_CORE, &rlim) < 0) 253 fatal("setrlimit failed: %.100s", strerror(errno)); 254 } 255 #endif 256 /* Get user data. */ 257 pw = getpwuid(original_real_uid); 258 if (!pw) { 259 logit("You don't exist, go away!"); 260 exit(255); 261 } 262 /* Take a copy of the returned structure. */ 263 pw = pwcopy(pw); 264 265 /* 266 * Set our umask to something reasonable, as some files are created 267 * with the default umask. This will make them world-readable but 268 * writable only by the owner, which is ok for all files for which we 269 * don't set the modes explicitly. 270 */ 271 umask(022); 272 273 /* 274 * Initialize option structure to indicate that no values have been 275 * set. 276 */ 277 initialize_options(&options); 278 279 /* Parse command-line arguments. */ 280 host = NULL; 281 use_syslog = 0; 282 argv0 = av[0]; 283 284 again: 285 while ((opt = getopt(ac, av, "1246ab:c:e:fgi:kl:m:no:p:qstvx" 286 "ACD:F:I:KL:MNO:PR:S:TVw:W:XYy")) != -1) { 287 switch (opt) { 288 case '1': 289 options.protocol = SSH_PROTO_1; 290 break; 291 case '2': 292 options.protocol = SSH_PROTO_2; 293 break; 294 case '4': 295 options.address_family = AF_INET; 296 break; 297 case '6': 298 options.address_family = AF_INET6; 299 break; 300 case 'n': 301 stdin_null_flag = 1; 302 break; 303 case 'f': 304 fork_after_authentication_flag = 1; 305 stdin_null_flag = 1; 306 break; 307 case 'x': 308 options.forward_x11 = 0; 309 break; 310 case 'X': 311 options.forward_x11 = 1; 312 break; 313 case 'y': 314 use_syslog = 1; 315 break; 316 case 'Y': 317 options.forward_x11 = 1; 318 options.forward_x11_trusted = 1; 319 break; 320 case 'g': 321 options.gateway_ports = 1; 322 break; 323 case 'O': 324 if (stdio_forward_host != NULL) 325 fatal("Cannot specify multiplexing " 326 "command with -W"); 327 else if (muxclient_command != 0) 328 fatal("Multiplexing command already specified"); 329 if (strcmp(optarg, "check") == 0) 330 muxclient_command = SSHMUX_COMMAND_ALIVE_CHECK; 331 else if (strcmp(optarg, "exit") == 0) 332 muxclient_command = SSHMUX_COMMAND_TERMINATE; 333 else 334 fatal("Invalid multiplex command."); 335 break; 336 case 'P': /* deprecated */ 337 options.use_privileged_port = 0; 338 break; 339 case 'a': 340 options.forward_agent = 0; 341 break; 342 case 'A': 343 options.forward_agent = 1; 344 break; 345 case 'k': 346 options.gss_deleg_creds = 0; 347 break; 348 case 'K': 349 options.gss_authentication = 1; 350 options.gss_deleg_creds = 1; 351 break; 352 case 'i': 353 if (stat(optarg, &st) < 0) { 354 fprintf(stderr, "Warning: Identity file %s " 355 "not accessible: %s.\n", optarg, 356 strerror(errno)); 357 break; 358 } 359 if (options.num_identity_files >= 360 SSH_MAX_IDENTITY_FILES) 361 fatal("Too many identity files specified " 362 "(max %d)", SSH_MAX_IDENTITY_FILES); 363 options.identity_files[options.num_identity_files++] = 364 xstrdup(optarg); 365 break; 366 case 'I': 367 #ifdef ENABLE_PKCS11 368 options.pkcs11_provider = xstrdup(optarg); 369 #else 370 fprintf(stderr, "no support for PKCS#11.\n"); 371 #endif 372 break; 373 case 't': 374 if (tty_flag) 375 force_tty_flag = 1; 376 tty_flag = 1; 377 break; 378 case 'v': 379 if (debug_flag == 0) { 380 debug_flag = 1; 381 options.log_level = SYSLOG_LEVEL_DEBUG1; 382 } else { 383 if (options.log_level < SYSLOG_LEVEL_DEBUG3) 384 options.log_level++; 385 break; 386 } 387 /* FALLTHROUGH */ 388 case 'V': 389 fprintf(stderr, "%s, %s\n", 390 SSH_RELEASE, SSLeay_version(SSLEAY_VERSION)); 391 if (opt == 'V') 392 exit(0); 393 break; 394 case 'w': 395 if (options.tun_open == -1) 396 options.tun_open = SSH_TUNMODE_DEFAULT; 397 options.tun_local = a2tun(optarg, &options.tun_remote); 398 if (options.tun_local == SSH_TUNID_ERR) { 399 fprintf(stderr, 400 "Bad tun device '%s'\n", optarg); 401 exit(255); 402 } 403 break; 404 case 'W': 405 if (stdio_forward_host != NULL) 406 fatal("stdio forward already specified"); 407 if (muxclient_command != 0) 408 fatal("Cannot specify stdio forward with -O"); 409 if (parse_forward(&fwd, optarg, 1, 0)) { 410 stdio_forward_host = fwd.listen_host; 411 stdio_forward_port = fwd.listen_port; 412 xfree(fwd.connect_host); 413 } else { 414 fprintf(stderr, 415 "Bad stdio forwarding specification '%s'\n", 416 optarg); 417 exit(255); 418 } 419 no_tty_flag = 1; 420 no_shell_flag = 1; 421 options.clear_forwardings = 1; 422 options.exit_on_forward_failure = 1; 423 break; 424 case 'q': 425 options.log_level = SYSLOG_LEVEL_QUIET; 426 break; 427 case 'e': 428 if (optarg[0] == '^' && optarg[2] == 0 && 429 (u_char) optarg[1] >= 64 && 430 (u_char) optarg[1] < 128) 431 options.escape_char = (u_char) optarg[1] & 31; 432 else if (strlen(optarg) == 1) 433 options.escape_char = (u_char) optarg[0]; 434 else if (strcmp(optarg, "none") == 0) 435 options.escape_char = SSH_ESCAPECHAR_NONE; 436 else { 437 fprintf(stderr, "Bad escape character '%s'.\n", 438 optarg); 439 exit(255); 440 } 441 break; 442 case 'c': 443 if (ciphers_valid(optarg)) { 444 /* SSH2 only */ 445 options.ciphers = xstrdup(optarg); 446 options.cipher = SSH_CIPHER_INVALID; 447 } else { 448 /* SSH1 only */ 449 options.cipher = cipher_number(optarg); 450 if (options.cipher == -1) { 451 fprintf(stderr, 452 "Unknown cipher type '%s'\n", 453 optarg); 454 exit(255); 455 } 456 if (options.cipher == SSH_CIPHER_3DES) 457 options.ciphers = "3des-cbc"; 458 else if (options.cipher == SSH_CIPHER_BLOWFISH) 459 options.ciphers = "blowfish-cbc"; 460 else 461 options.ciphers = (char *)-1; 462 } 463 break; 464 case 'm': 465 if (mac_valid(optarg)) 466 options.macs = xstrdup(optarg); 467 else { 468 fprintf(stderr, "Unknown mac type '%s'\n", 469 optarg); 470 exit(255); 471 } 472 break; 473 case 'M': 474 if (options.control_master == SSHCTL_MASTER_YES) 475 options.control_master = SSHCTL_MASTER_ASK; 476 else 477 options.control_master = SSHCTL_MASTER_YES; 478 break; 479 case 'p': 480 options.port = a2port(optarg); 481 if (options.port <= 0) { 482 fprintf(stderr, "Bad port '%s'\n", optarg); 483 exit(255); 484 } 485 break; 486 case 'l': 487 options.user = optarg; 488 break; 489 490 case 'L': 491 if (parse_forward(&fwd, optarg, 0, 0)) 492 add_local_forward(&options, &fwd); 493 else { 494 fprintf(stderr, 495 "Bad local forwarding specification '%s'\n", 496 optarg); 497 exit(255); 498 } 499 break; 500 501 case 'R': 502 if (parse_forward(&fwd, optarg, 0, 1)) { 503 add_remote_forward(&options, &fwd); 504 } else { 505 fprintf(stderr, 506 "Bad remote forwarding specification " 507 "'%s'\n", optarg); 508 exit(255); 509 } 510 break; 511 512 case 'D': 513 if (parse_forward(&fwd, optarg, 1, 0)) { 514 add_local_forward(&options, &fwd); 515 } else { 516 fprintf(stderr, 517 "Bad dynamic forwarding specification " 518 "'%s'\n", optarg); 519 exit(255); 520 } 521 break; 522 523 case 'C': 524 options.compression = 1; 525 break; 526 case 'N': 527 no_shell_flag = 1; 528 no_tty_flag = 1; 529 break; 530 case 'T': 531 no_tty_flag = 1; 532 break; 533 case 'o': 534 dummy = 1; 535 line = xstrdup(optarg); 536 if (process_config_line(&options, host ? host : "", 537 line, "command-line", 0, &dummy) != 0) 538 exit(255); 539 xfree(line); 540 break; 541 case 's': 542 subsystem_flag = 1; 543 break; 544 case 'S': 545 if (options.control_path != NULL) 546 free(options.control_path); 547 options.control_path = xstrdup(optarg); 548 break; 549 case 'b': 550 options.bind_address = optarg; 551 break; 552 case 'F': 553 config = optarg; 554 break; 555 default: 556 usage(); 557 } 558 } 559 560 ac -= optind; 561 av += optind; 562 563 if (ac > 0 && !host) { 564 if (strrchr(*av, '@')) { 565 p = xstrdup(*av); 566 cp = strrchr(p, '@'); 567 if (cp == NULL || cp == p) 568 usage(); 569 options.user = p; 570 *cp = '\0'; 571 host = ++cp; 572 } else 573 host = *av; 574 if (ac > 1) { 575 optind = optreset = 1; 576 goto again; 577 } 578 ac--, av++; 579 } 580 581 /* Check that we got a host name. */ 582 if (!host) 583 usage(); 584 585 SSLeay_add_all_algorithms(); 586 ERR_load_crypto_strings(); 587 588 /* Initialize the command to execute on remote host. */ 589 buffer_init(&command); 590 591 /* 592 * Save the command to execute on the remote host in a buffer. There 593 * is no limit on the length of the command, except by the maximum 594 * packet size. Also sets the tty flag if there is no command. 595 */ 596 if (!ac) { 597 /* No command specified - execute shell on a tty. */ 598 tty_flag = 1; 599 if (subsystem_flag) { 600 fprintf(stderr, 601 "You must specify a subsystem to invoke.\n"); 602 usage(); 603 } 604 } else { 605 /* A command has been specified. Store it into the buffer. */ 606 for (i = 0; i < ac; i++) { 607 if (i) 608 buffer_append(&command, " ", 1); 609 buffer_append(&command, av[i], strlen(av[i])); 610 } 611 } 612 613 /* Cannot fork to background if no command. */ 614 if (fork_after_authentication_flag && buffer_len(&command) == 0 && 615 !no_shell_flag) 616 fatal("Cannot fork into background without a command " 617 "to execute."); 618 619 /* Allocate a tty by default if no command specified. */ 620 if (buffer_len(&command) == 0) 621 tty_flag = 1; 622 623 /* Force no tty */ 624 if (no_tty_flag) 625 tty_flag = 0; 626 /* Do not allocate a tty if stdin is not a tty. */ 627 if ((!isatty(fileno(stdin)) || stdin_null_flag) && !force_tty_flag) { 628 if (tty_flag) 629 logit("Pseudo-terminal will not be allocated because " 630 "stdin is not a terminal."); 631 tty_flag = 0; 632 } 633 634 /* 635 * Initialize "log" output. Since we are the client all output 636 * actually goes to stderr. 637 */ 638 log_init(argv0, 639 options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level, 640 SYSLOG_FACILITY_USER, !use_syslog); 641 642 /* 643 * Read per-user configuration file. Ignore the system wide config 644 * file if the user specifies a config file on the command line. 645 */ 646 if (config != NULL) { 647 if (!read_config_file(config, host, &options, 0)) 648 fatal("Can't open user config file %.100s: " 649 "%.100s", config, strerror(errno)); 650 } else { 651 r = snprintf(buf, sizeof buf, "%s/%s", pw->pw_dir, 652 _PATH_SSH_USER_CONFFILE); 653 if (r > 0 && (size_t)r < sizeof(buf)) 654 (void)read_config_file(buf, host, &options, 1); 655 656 /* Read systemwide configuration file after use config. */ 657 (void)read_config_file(_PATH_HOST_CONFIG_FILE, host, 658 &options, 0); 659 } 660 661 /* Fill configuration defaults. */ 662 fill_default_options(&options); 663 664 channel_set_af(options.address_family); 665 666 /* reinit */ 667 log_init(argv0, options.log_level, SYSLOG_FACILITY_USER, !use_syslog); 668 669 seed_rng(); 670 671 if (options.user == NULL) 672 options.user = xstrdup(pw->pw_name); 673 674 /* Get default port if port has not been set. */ 675 if (options.port == 0) { 676 sp = getservbyname(SSH_SERVICE_NAME, "tcp"); 677 options.port = sp ? ntohs(sp->s_port) : SSH_DEFAULT_PORT; 678 } 679 680 if (options.local_command != NULL) { 681 char thishost[NI_MAXHOST]; 682 683 if (gethostname(thishost, sizeof(thishost)) == -1) 684 fatal("gethostname: %s", strerror(errno)); 685 snprintf(buf, sizeof(buf), "%d", options.port); 686 debug3("expanding LocalCommand: %s", options.local_command); 687 cp = options.local_command; 688 options.local_command = percent_expand(cp, "d", pw->pw_dir, 689 "h", options.hostname? options.hostname : host, 690 "l", thishost, "n", host, "r", options.user, "p", buf, 691 "u", pw->pw_name, (char *)NULL); 692 debug3("expanded LocalCommand: %s", options.local_command); 693 xfree(cp); 694 } 695 696 if (options.hostname != NULL) 697 host = options.hostname; 698 699 /* Find canonic host name. */ 700 if (strchr(host, '.') == 0) { 701 struct addrinfo hints; 702 struct addrinfo *ai = NULL; 703 int errgai; 704 memset(&hints, 0, sizeof(hints)); 705 hints.ai_family = options.address_family; 706 hints.ai_flags = AI_CANONNAME; 707 hints.ai_socktype = SOCK_STREAM; 708 errgai = getaddrinfo(host, NULL, &hints, &ai); 709 if (errgai == 0) { 710 if (ai->ai_canonname != NULL) 711 host = xstrdup(ai->ai_canonname); 712 freeaddrinfo(ai); 713 } 714 } 715 716 /* force lowercase for hostkey matching */ 717 if (options.host_key_alias != NULL) { 718 for (p = options.host_key_alias; *p; p++) 719 if (isupper(*p)) 720 *p = (char)tolower(*p); 721 } 722 723 if (options.proxy_command != NULL && 724 strcmp(options.proxy_command, "none") == 0) { 725 xfree(options.proxy_command); 726 options.proxy_command = NULL; 727 } 728 if (options.control_path != NULL && 729 strcmp(options.control_path, "none") == 0) { 730 xfree(options.control_path); 731 options.control_path = NULL; 732 } 733 734 if (options.control_path != NULL) { 735 char thishost[NI_MAXHOST]; 736 737 if (gethostname(thishost, sizeof(thishost)) == -1) 738 fatal("gethostname: %s", strerror(errno)); 739 snprintf(buf, sizeof(buf), "%d", options.port); 740 cp = tilde_expand_filename(options.control_path, 741 original_real_uid); 742 xfree(options.control_path); 743 options.control_path = percent_expand(cp, "p", buf, "h", host, 744 "r", options.user, "l", thishost, (char *)NULL); 745 xfree(cp); 746 } 747 if (muxclient_command != 0 && options.control_path == NULL) 748 fatal("No ControlPath specified for \"-O\" command"); 749 if (options.control_path != NULL) 750 muxclient(options.control_path); 751 752 timeout_ms = options.connection_timeout * 1000; 753 754 /* Open a connection to the remote host. */ 755 if (ssh_connect(host, &hostaddr, options.port, 756 options.address_family, options.connection_attempts, &timeout_ms, 757 options.tcp_keep_alive, 758 #ifdef HAVE_CYGWIN 759 options.use_privileged_port, 760 #else 761 original_effective_uid == 0 && options.use_privileged_port, 762 #endif 763 options.proxy_command) != 0) 764 exit(255); 765 766 if (timeout_ms > 0) 767 debug3("timeout: %d ms remain after connect", timeout_ms); 768 769 /* 770 * If we successfully made the connection, load the host private key 771 * in case we will need it later for combined rsa-rhosts 772 * authentication. This must be done before releasing extra 773 * privileges, because the file is only readable by root. 774 * If we cannot access the private keys, load the public keys 775 * instead and try to execute the ssh-keysign helper instead. 776 */ 777 sensitive_data.nkeys = 0; 778 sensitive_data.keys = NULL; 779 sensitive_data.external_keysign = 0; 780 if (options.rhosts_rsa_authentication || 781 options.hostbased_authentication) { 782 sensitive_data.nkeys = 3; 783 sensitive_data.keys = xcalloc(sensitive_data.nkeys, 784 sizeof(Key)); 785 786 PRIV_START; 787 sensitive_data.keys[0] = key_load_private_type(KEY_RSA1, 788 _PATH_HOST_KEY_FILE, "", NULL, NULL); 789 sensitive_data.keys[1] = key_load_private_type(KEY_DSA, 790 _PATH_HOST_DSA_KEY_FILE, "", NULL, NULL); 791 sensitive_data.keys[2] = key_load_private_type(KEY_RSA, 792 _PATH_HOST_RSA_KEY_FILE, "", NULL, NULL); 793 PRIV_END; 794 795 if (options.hostbased_authentication == 1 && 796 sensitive_data.keys[0] == NULL && 797 sensitive_data.keys[1] == NULL && 798 sensitive_data.keys[2] == NULL) { 799 sensitive_data.keys[1] = key_load_public( 800 _PATH_HOST_DSA_KEY_FILE, NULL); 801 sensitive_data.keys[2] = key_load_public( 802 _PATH_HOST_RSA_KEY_FILE, NULL); 803 sensitive_data.external_keysign = 1; 804 } 805 } 806 /* 807 * Get rid of any extra privileges that we may have. We will no 808 * longer need them. Also, extra privileges could make it very hard 809 * to read identity files and other non-world-readable files from the 810 * user's home directory if it happens to be on a NFS volume where 811 * root is mapped to nobody. 812 */ 813 if (original_effective_uid == 0) { 814 PRIV_START; 815 permanently_set_uid(pw); 816 } 817 818 /* 819 * Now that we are back to our own permissions, create ~/.ssh 820 * directory if it doesn't already exist. 821 */ 822 r = snprintf(buf, sizeof buf, "%s%s%s", pw->pw_dir, 823 strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR); 824 if (r > 0 && (size_t)r < sizeof(buf) && stat(buf, &st) < 0) 825 if (mkdir(buf, 0700) < 0) 826 error("Could not create directory '%.200s'.", buf); 827 828 /* load options.identity_files */ 829 load_public_identity_files(); 830 831 /* Expand ~ in known host file names. */ 832 /* XXX mem-leaks: */ 833 options.system_hostfile = 834 tilde_expand_filename(options.system_hostfile, original_real_uid); 835 options.user_hostfile = 836 tilde_expand_filename(options.user_hostfile, original_real_uid); 837 options.system_hostfile2 = 838 tilde_expand_filename(options.system_hostfile2, original_real_uid); 839 options.user_hostfile2 = 840 tilde_expand_filename(options.user_hostfile2, original_real_uid); 841 842 signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */ 843 844 /* Log into the remote system. Never returns if the login fails. */ 845 ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr, 846 pw, timeout_ms); 847 848 /* We no longer need the private host keys. Clear them now. */ 849 if (sensitive_data.nkeys != 0) { 850 for (i = 0; i < sensitive_data.nkeys; i++) { 851 if (sensitive_data.keys[i] != NULL) { 852 /* Destroys contents safely */ 853 debug3("clear hostkey %d", i); 854 key_free(sensitive_data.keys[i]); 855 sensitive_data.keys[i] = NULL; 856 } 857 } 858 xfree(sensitive_data.keys); 859 } 860 for (i = 0; i < options.num_identity_files; i++) { 861 if (options.identity_files[i]) { 862 xfree(options.identity_files[i]); 863 options.identity_files[i] = NULL; 864 } 865 if (options.identity_keys[i]) { 866 key_free(options.identity_keys[i]); 867 options.identity_keys[i] = NULL; 868 } 869 } 870 871 exit_status = compat20 ? ssh_session2() : ssh_session(); 872 packet_close(); 873 874 if (options.control_path != NULL && muxserver_sock != -1) 875 unlink(options.control_path); 876 877 /* 878 * Send SIGHUP to proxy command if used. We don't wait() in 879 * case it hangs and instead rely on init to reap the child 880 */ 881 if (proxy_command_pid > 1) 882 kill(proxy_command_pid, SIGHUP); 883 884 return exit_status; 885 } 886 887 /* Callback for remote forward global requests */ 888 static void 889 ssh_confirm_remote_forward(int type, u_int32_t seq, void *ctxt) 890 { 891 Forward *rfwd = (Forward *)ctxt; 892 893 /* XXX verbose() on failure? */ 894 debug("remote forward %s for: listen %d, connect %s:%d", 895 type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure", 896 rfwd->listen_port, rfwd->connect_host, rfwd->connect_port); 897 if (type == SSH2_MSG_REQUEST_SUCCESS && rfwd->listen_port == 0) { 898 logit("Allocated port %u for remote forward to %s:%d", 899 packet_get_int(), 900 rfwd->connect_host, rfwd->connect_port); 901 } 902 903 if (type == SSH2_MSG_REQUEST_FAILURE) { 904 if (options.exit_on_forward_failure) 905 fatal("Error: remote port forwarding failed for " 906 "listen port %d", rfwd->listen_port); 907 else 908 logit("Warning: remote port forwarding failed for " 909 "listen port %d", rfwd->listen_port); 910 } 911 if (++remote_forward_confirms_received == options.num_remote_forwards) { 912 debug("All remote forwarding requests processed"); 913 if (fork_after_authentication_flag) { 914 fork_after_authentication_flag = 0; 915 if (daemon(1, 1) < 0) 916 fatal("daemon() failed: %.200s", 917 strerror(errno)); 918 } 919 } 920 } 921 922 static void 923 client_cleanup_stdio_fwd(int id, void *arg) 924 { 925 debug("stdio forwarding: done"); 926 cleanup_exit(0); 927 } 928 929 static int 930 client_setup_stdio_fwd(const char *host_to_connect, u_short port_to_connect) 931 { 932 Channel *c; 933 int in, out; 934 935 debug3("client_setup_stdio_fwd %s:%d", host_to_connect, 936 port_to_connect); 937 938 in = dup(STDIN_FILENO); 939 out = dup(STDOUT_FILENO); 940 if (in < 0 || out < 0) 941 fatal("channel_connect_stdio_fwd: dup() in/out failed"); 942 943 if ((c = channel_connect_stdio_fwd(host_to_connect, port_to_connect, 944 in, out)) == NULL) 945 return 0; 946 channel_register_cleanup(c->self, client_cleanup_stdio_fwd, 0); 947 return 1; 948 } 949 950 static void 951 ssh_init_forwarding(void) 952 { 953 int success = 0; 954 int i; 955 956 if (stdio_forward_host != NULL) { 957 if (!compat20) { 958 fatal("stdio forwarding require Protocol 2"); 959 } 960 if (!client_setup_stdio_fwd(stdio_forward_host, 961 stdio_forward_port)) 962 fatal("Failed to connect in stdio forward mode."); 963 } 964 965 /* Initiate local TCP/IP port forwardings. */ 966 for (i = 0; i < options.num_local_forwards; i++) { 967 debug("Local connections to %.200s:%d forwarded to remote " 968 "address %.200s:%d", 969 (options.local_forwards[i].listen_host == NULL) ? 970 (options.gateway_ports ? "*" : "LOCALHOST") : 971 options.local_forwards[i].listen_host, 972 options.local_forwards[i].listen_port, 973 options.local_forwards[i].connect_host, 974 options.local_forwards[i].connect_port); 975 success += channel_setup_local_fwd_listener( 976 options.local_forwards[i].listen_host, 977 options.local_forwards[i].listen_port, 978 options.local_forwards[i].connect_host, 979 options.local_forwards[i].connect_port, 980 options.gateway_ports); 981 } 982 if (i > 0 && success != i && options.exit_on_forward_failure) 983 fatal("Could not request local forwarding."); 984 if (i > 0 && success == 0) 985 error("Could not request local forwarding."); 986 987 /* Initiate remote TCP/IP port forwardings. */ 988 for (i = 0; i < options.num_remote_forwards; i++) { 989 debug("Remote connections from %.200s:%d forwarded to " 990 "local address %.200s:%d", 991 (options.remote_forwards[i].listen_host == NULL) ? 992 "LOCALHOST" : options.remote_forwards[i].listen_host, 993 options.remote_forwards[i].listen_port, 994 options.remote_forwards[i].connect_host, 995 options.remote_forwards[i].connect_port); 996 if (channel_request_remote_forwarding( 997 options.remote_forwards[i].listen_host, 998 options.remote_forwards[i].listen_port, 999 options.remote_forwards[i].connect_host, 1000 options.remote_forwards[i].connect_port) < 0) { 1001 if (options.exit_on_forward_failure) 1002 fatal("Could not request remote forwarding."); 1003 else 1004 logit("Warning: Could not request remote " 1005 "forwarding."); 1006 } 1007 client_register_global_confirm(ssh_confirm_remote_forward, 1008 &options.remote_forwards[i]); 1009 } 1010 1011 /* Initiate tunnel forwarding. */ 1012 if (options.tun_open != SSH_TUNMODE_NO) { 1013 if (client_request_tun_fwd(options.tun_open, 1014 options.tun_local, options.tun_remote) == -1) { 1015 if (options.exit_on_forward_failure) 1016 fatal("Could not request tunnel forwarding."); 1017 else 1018 error("Could not request tunnel forwarding."); 1019 } 1020 } 1021 } 1022 1023 static void 1024 check_agent_present(void) 1025 { 1026 if (options.forward_agent) { 1027 /* Clear agent forwarding if we don't have an agent. */ 1028 if (!ssh_agent_present()) 1029 options.forward_agent = 0; 1030 } 1031 } 1032 1033 static int 1034 ssh_session(void) 1035 { 1036 int type; 1037 int interactive = 0; 1038 int have_tty = 0; 1039 struct winsize ws; 1040 char *cp; 1041 const char *display; 1042 1043 /* Enable compression if requested. */ 1044 if (options.compression) { 1045 debug("Requesting compression at level %d.", 1046 options.compression_level); 1047 1048 if (options.compression_level < 1 || 1049 options.compression_level > 9) 1050 fatal("Compression level must be from 1 (fast) to " 1051 "9 (slow, best)."); 1052 1053 /* Send the request. */ 1054 packet_start(SSH_CMSG_REQUEST_COMPRESSION); 1055 packet_put_int(options.compression_level); 1056 packet_send(); 1057 packet_write_wait(); 1058 type = packet_read(); 1059 if (type == SSH_SMSG_SUCCESS) 1060 packet_start_compression(options.compression_level); 1061 else if (type == SSH_SMSG_FAILURE) 1062 logit("Warning: Remote host refused compression."); 1063 else 1064 packet_disconnect("Protocol error waiting for " 1065 "compression response."); 1066 } 1067 /* Allocate a pseudo tty if appropriate. */ 1068 if (tty_flag) { 1069 debug("Requesting pty."); 1070 1071 /* Start the packet. */ 1072 packet_start(SSH_CMSG_REQUEST_PTY); 1073 1074 /* Store TERM in the packet. There is no limit on the 1075 length of the string. */ 1076 cp = getenv("TERM"); 1077 if (!cp) 1078 cp = ""; 1079 packet_put_cstring(cp); 1080 1081 /* Store window size in the packet. */ 1082 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) 1083 memset(&ws, 0, sizeof(ws)); 1084 packet_put_int((u_int)ws.ws_row); 1085 packet_put_int((u_int)ws.ws_col); 1086 packet_put_int((u_int)ws.ws_xpixel); 1087 packet_put_int((u_int)ws.ws_ypixel); 1088 1089 /* Store tty modes in the packet. */ 1090 tty_make_modes(fileno(stdin), NULL); 1091 1092 /* Send the packet, and wait for it to leave. */ 1093 packet_send(); 1094 packet_write_wait(); 1095 1096 /* Read response from the server. */ 1097 type = packet_read(); 1098 if (type == SSH_SMSG_SUCCESS) { 1099 interactive = 1; 1100 have_tty = 1; 1101 } else if (type == SSH_SMSG_FAILURE) 1102 logit("Warning: Remote host failed or refused to " 1103 "allocate a pseudo tty."); 1104 else 1105 packet_disconnect("Protocol error waiting for pty " 1106 "request response."); 1107 } 1108 /* Request X11 forwarding if enabled and DISPLAY is set. */ 1109 display = getenv("DISPLAY"); 1110 if (options.forward_x11 && display != NULL) { 1111 char *proto, *data; 1112 /* Get reasonable local authentication information. */ 1113 client_x11_get_proto(display, options.xauth_location, 1114 options.forward_x11_trusted, &proto, &data); 1115 /* Request forwarding with authentication spoofing. */ 1116 debug("Requesting X11 forwarding with authentication " 1117 "spoofing."); 1118 x11_request_forwarding_with_spoofing(0, display, proto, data); 1119 1120 /* Read response from the server. */ 1121 type = packet_read(); 1122 if (type == SSH_SMSG_SUCCESS) { 1123 interactive = 1; 1124 } else if (type == SSH_SMSG_FAILURE) { 1125 logit("Warning: Remote host denied X11 forwarding."); 1126 } else { 1127 packet_disconnect("Protocol error waiting for X11 " 1128 "forwarding"); 1129 } 1130 } 1131 /* Tell the packet module whether this is an interactive session. */ 1132 packet_set_interactive(interactive); 1133 1134 /* Request authentication agent forwarding if appropriate. */ 1135 check_agent_present(); 1136 1137 if (options.forward_agent) { 1138 debug("Requesting authentication agent forwarding."); 1139 auth_request_forwarding(); 1140 1141 /* Read response from the server. */ 1142 type = packet_read(); 1143 packet_check_eom(); 1144 if (type != SSH_SMSG_SUCCESS) 1145 logit("Warning: Remote host denied authentication agent forwarding."); 1146 } 1147 1148 /* Initiate port forwardings. */ 1149 ssh_init_forwarding(); 1150 1151 /* Execute a local command */ 1152 if (options.local_command != NULL && 1153 options.permit_local_command) 1154 ssh_local_cmd(options.local_command); 1155 1156 /* 1157 * If requested and we are not interested in replies to remote 1158 * forwarding requests, then let ssh continue in the background. 1159 */ 1160 if (fork_after_authentication_flag && 1161 (!options.exit_on_forward_failure || 1162 options.num_remote_forwards == 0)) { 1163 fork_after_authentication_flag = 0; 1164 if (daemon(1, 1) < 0) 1165 fatal("daemon() failed: %.200s", strerror(errno)); 1166 } 1167 1168 /* 1169 * If a command was specified on the command line, execute the 1170 * command now. Otherwise request the server to start a shell. 1171 */ 1172 if (buffer_len(&command) > 0) { 1173 int len = buffer_len(&command); 1174 if (len > 900) 1175 len = 900; 1176 debug("Sending command: %.*s", len, 1177 (u_char *)buffer_ptr(&command)); 1178 packet_start(SSH_CMSG_EXEC_CMD); 1179 packet_put_string(buffer_ptr(&command), buffer_len(&command)); 1180 packet_send(); 1181 packet_write_wait(); 1182 } else { 1183 debug("Requesting shell."); 1184 packet_start(SSH_CMSG_EXEC_SHELL); 1185 packet_send(); 1186 packet_write_wait(); 1187 } 1188 1189 /* Enter the interactive session. */ 1190 return client_loop(have_tty, tty_flag ? 1191 options.escape_char : SSH_ESCAPECHAR_NONE, 0); 1192 } 1193 1194 /* request pty/x11/agent/tcpfwd/shell for channel */ 1195 static void 1196 ssh_session2_setup(int id, void *arg) 1197 { 1198 extern char **environ; 1199 const char *display; 1200 int interactive = tty_flag; 1201 1202 display = getenv("DISPLAY"); 1203 if (options.forward_x11 && display != NULL) { 1204 char *proto, *data; 1205 /* Get reasonable local authentication information. */ 1206 client_x11_get_proto(display, options.xauth_location, 1207 options.forward_x11_trusted, &proto, &data); 1208 /* Request forwarding with authentication spoofing. */ 1209 debug("Requesting X11 forwarding with authentication " 1210 "spoofing."); 1211 x11_request_forwarding_with_spoofing(id, display, proto, data); 1212 interactive = 1; 1213 /* XXX wait for reply */ 1214 } 1215 1216 check_agent_present(); 1217 if (options.forward_agent) { 1218 debug("Requesting authentication agent forwarding."); 1219 channel_request_start(id, "auth-agent-req@openssh.com", 0); 1220 packet_send(); 1221 } 1222 1223 client_session2_setup(id, tty_flag, subsystem_flag, getenv("TERM"), 1224 NULL, fileno(stdin), &command, environ); 1225 1226 packet_set_interactive(interactive); 1227 } 1228 1229 /* open new channel for a session */ 1230 static int 1231 ssh_session2_open(void) 1232 { 1233 Channel *c; 1234 int window, packetmax, in, out, err; 1235 1236 if (stdin_null_flag) { 1237 in = open(_PATH_DEVNULL, O_RDONLY); 1238 } else { 1239 in = dup(STDIN_FILENO); 1240 } 1241 out = dup(STDOUT_FILENO); 1242 err = dup(STDERR_FILENO); 1243 1244 if (in < 0 || out < 0 || err < 0) 1245 fatal("dup() in/out/err failed"); 1246 1247 /* enable nonblocking unless tty */ 1248 if (!isatty(in)) 1249 set_nonblock(in); 1250 if (!isatty(out)) 1251 set_nonblock(out); 1252 if (!isatty(err)) 1253 set_nonblock(err); 1254 1255 window = CHAN_SES_WINDOW_DEFAULT; 1256 packetmax = CHAN_SES_PACKET_DEFAULT; 1257 if (tty_flag) { 1258 window >>= 1; 1259 packetmax >>= 1; 1260 } 1261 c = channel_new( 1262 "session", SSH_CHANNEL_OPENING, in, out, err, 1263 window, packetmax, CHAN_EXTENDED_WRITE, 1264 "client-session", /*nonblock*/0); 1265 1266 debug3("ssh_session2_open: channel_new: %d", c->self); 1267 1268 channel_send_open(c->self); 1269 if (!no_shell_flag) 1270 channel_register_open_confirm(c->self, 1271 ssh_session2_setup, NULL); 1272 1273 return c->self; 1274 } 1275 1276 static int 1277 ssh_session2(void) 1278 { 1279 int id = -1; 1280 1281 /* XXX should be pre-session */ 1282 ssh_init_forwarding(); 1283 1284 if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN)) 1285 id = ssh_session2_open(); 1286 1287 /* If we don't expect to open a new session, then disallow it */ 1288 if (options.control_master == SSHCTL_MASTER_NO && 1289 (datafellows & SSH_NEW_OPENSSH)) { 1290 debug("Requesting no-more-sessions@openssh.com"); 1291 packet_start(SSH2_MSG_GLOBAL_REQUEST); 1292 packet_put_cstring("no-more-sessions@openssh.com"); 1293 packet_put_char(0); 1294 packet_send(); 1295 } 1296 1297 /* Execute a local command */ 1298 if (options.local_command != NULL && 1299 options.permit_local_command) 1300 ssh_local_cmd(options.local_command); 1301 1302 /* Start listening for multiplex clients */ 1303 muxserver_listen(); 1304 1305 /* If requested, let ssh continue in the background. */ 1306 if (fork_after_authentication_flag) { 1307 fork_after_authentication_flag = 0; 1308 if (daemon(1, 1) < 0) 1309 fatal("daemon() failed: %.200s", strerror(errno)); 1310 } 1311 1312 if (options.use_roaming) 1313 request_roaming(); 1314 1315 return client_loop(tty_flag, tty_flag ? 1316 options.escape_char : SSH_ESCAPECHAR_NONE, id); 1317 } 1318 1319 static void 1320 load_public_identity_files(void) 1321 { 1322 char *filename, *cp, thishost[NI_MAXHOST]; 1323 char *pwdir = NULL, *pwname = NULL; 1324 int i = 0; 1325 Key *public; 1326 struct passwd *pw; 1327 u_int n_ids; 1328 char *identity_files[SSH_MAX_IDENTITY_FILES]; 1329 Key *identity_keys[SSH_MAX_IDENTITY_FILES]; 1330 #ifdef ENABLE_PKCS11 1331 Key **keys; 1332 int nkeys; 1333 #endif /* PKCS11 */ 1334 1335 n_ids = 0; 1336 bzero(identity_files, sizeof(identity_files)); 1337 bzero(identity_keys, sizeof(identity_keys)); 1338 1339 #ifdef ENABLE_PKCS11 1340 if (options.pkcs11_provider != NULL && 1341 options.num_identity_files < SSH_MAX_IDENTITY_FILES && 1342 (pkcs11_init(!options.batch_mode) == 0) && 1343 (nkeys = pkcs11_add_provider(options.pkcs11_provider, NULL, 1344 &keys)) > 0) { 1345 for (i = 0; i < nkeys; i++) { 1346 if (n_ids >= SSH_MAX_IDENTITY_FILES) { 1347 key_free(keys[i]); 1348 continue; 1349 } 1350 identity_keys[n_ids] = keys[i]; 1351 identity_files[n_ids] = 1352 xstrdup(options.pkcs11_provider); /* XXX */ 1353 n_ids++; 1354 } 1355 xfree(keys); 1356 } 1357 #endif /* ENABLE_PKCS11 */ 1358 if ((pw = getpwuid(original_real_uid)) == NULL) 1359 fatal("load_public_identity_files: getpwuid failed"); 1360 pwname = xstrdup(pw->pw_name); 1361 pwdir = xstrdup(pw->pw_dir); 1362 if (gethostname(thishost, sizeof(thishost)) == -1) 1363 fatal("load_public_identity_files: gethostname: %s", 1364 strerror(errno)); 1365 for (i = 0; i < options.num_identity_files; i++) { 1366 if (n_ids >= SSH_MAX_IDENTITY_FILES) { 1367 xfree(options.identity_files[i]); 1368 continue; 1369 } 1370 cp = tilde_expand_filename(options.identity_files[i], 1371 original_real_uid); 1372 filename = percent_expand(cp, "d", pwdir, 1373 "u", pwname, "l", thishost, "h", host, 1374 "r", options.user, (char *)NULL); 1375 xfree(cp); 1376 public = key_load_public(filename, NULL); 1377 debug("identity file %s type %d", filename, 1378 public ? public->type : -1); 1379 xfree(options.identity_files[i]); 1380 identity_files[n_ids] = filename; 1381 identity_keys[n_ids] = public; 1382 1383 if (++n_ids >= SSH_MAX_IDENTITY_FILES) 1384 continue; 1385 1386 /* Try to add the certificate variant too */ 1387 xasprintf(&cp, "%s-cert", filename); 1388 public = key_load_public(cp, NULL); 1389 debug("identity file %s type %d", cp, 1390 public ? public->type : -1); 1391 if (public == NULL) { 1392 xfree(cp); 1393 continue; 1394 } 1395 if (!key_is_cert(public)) { 1396 debug("%s: key %s type %s is not a certificate", 1397 __func__, cp, key_type(public)); 1398 key_free(public); 1399 xfree(cp); 1400 continue; 1401 } 1402 identity_keys[n_ids] = public; 1403 /* point to the original path, most likely the private key */ 1404 identity_files[n_ids] = xstrdup(filename); 1405 n_ids++; 1406 } 1407 options.num_identity_files = n_ids; 1408 memcpy(options.identity_files, identity_files, sizeof(identity_files)); 1409 memcpy(options.identity_keys, identity_keys, sizeof(identity_keys)); 1410 1411 bzero(pwname, strlen(pwname)); 1412 xfree(pwname); 1413 bzero(pwdir, strlen(pwdir)); 1414 xfree(pwdir); 1415 } 1416