ssh.c

   1 /* $OpenBSD: ssh.c,v 1.332 2010/01/26 01:28:35 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
  45 #include <sys/types.h>
  46 #ifdef HAVE_SYS_STAT_H
  47 # include <sys/stat.h>
  48 #endif
  49 #include <sys/resource.h>
  50 #include <sys/ioctl.h>
  51 #include <sys/param.h>
  52 #include <sys/socket.h>
  53
  54 #include <ctype.h>
  55 #include <errno.h>
  56 #include <fcntl.h>
  57 #include <netdb.h>
  58 #ifdef HAVE_PATHS_H
  59 #include <paths.h>
  60 #endif
  61 #include <pwd.h>
  62 #include <signal.h>
  63 #include <stdarg.h>
  64 #include <stddef.h>
  65 #include <stdio.h>
  66 #include <stdlib.h>
  67 #include <string.h>
  68 #include <unistd.h>
  69
  70 #include <netinet/in.h>
  71 #include <arpa/inet.h>
  72
  73 #include <openssl/evp.h>
  74 #include <openssl/err.h>
  75 #include "openbsd-compat/openssl-compat.h"
  76 #include "openbsd-compat/sys-queue.h"
  77
  78 #include "xmalloc.h"
  79 #include "ssh.h"
  80 #include "ssh1.h"
  81 #include "ssh2.h"
  82 #include "compat.h"
  83 #include "cipher.h"
  84 #include "packet.h"
  85 #include "buffer.h"
  86 #include "channels.h"
  87 #include "key.h"
  88 #include "authfd.h"
  89 #include "authfile.h"
  90 #include "pathnames.h"
  91 #include "dispatch.h"
  92 #include "clientloop.h"
  93 #include "log.h"
  94 #include "readconf.h"
  95 #include "sshconnect.h"
  96 #include "misc.h"
  97 #include "kex.h"
  98 #include "mac.h"
  99 #include "sshpty.h"
 100 #include "match.h"
 101 #include "msg.h"
 102 #include "uidswap.h"
 103 #include "roaming.h"
 104 #include "version.h"
 105
 106 #ifdef SMARTCARD
 107 #include "scard.h"
 108 #endif
 109
 110 extern char *__progname;
 111
 112 /* Flag indicating whether debug mode is on.  May be set on the command line. */
 113 int debug_flag = 0;
 114
 115 /* Flag indicating whether a tty should be allocated */
 116 int tty_flag = 0;
 117 int no_tty_flag = 0;
 118 int force_tty_flag = 0;
 119
 120 /* don't exec a shell */
 121 int no_shell_flag = 0;
 122
 123 /*
 124  * Flag indicating that nothing should be read from stdin.  This can be set
 125  * on the command line.
 126  */
 127 int stdin_null_flag = 0;
 128
 129 /*
 130  * Flag indicating that ssh should fork after authentication.  This is useful
 131  * so that the passphrase can be entered manually, and then ssh goes to the
 132  * background.
 133  */
 134 int fork_after_authentication_flag = 0;
 135
 136 /* forward stdio to remote host and port */
 137 char *stdio_forward_host = NULL;
 138 int stdio_forward_port = 0;
 139
 140 /*
 141  * General data structure for command line options and options configurable
 142  * in configuration files.  See readconf.h.
 143  */
 144 Options options;
 145
 146 /* optional user configfile */
 147 char *config = NULL;
 148
 149 /*
 150  * Name of the host we are connecting to.  This is the name given on the
 151  * command line, or the HostName specified for the user-supplied name in a
 152  * configuration file.
 153  */
 154 char *host;
 155
 156 /* socket address the host resolves to */
 157 struct sockaddr_storage hostaddr;
 158
 159 /* Private host keys. */
 160 Sensitive sensitive_data;
 161
 162 /* Original real UID. */
 163 uid_t original_real_uid;
 164 uid_t original_effective_uid;
 165
 166 /* command to be executed */
 167 Buffer command;
 168
 169 /* Should we execute a command or invoke a subsystem? */
 170 int subsystem_flag = 0;
 171
 172 /* # of replies received for global requests */
 173 static int remote_forward_confirms_received = 0;
 174
 175 /* pid of proxycommand child process */
 176 pid_t proxy_command_pid = 0;
 177
 178 /* mux.c */
 179 extern int muxserver_sock;
 180 extern u_int muxclient_command;
 181
 182 /* Prints a help message to the user.  This function never returns. */
 183
 184 static void
 185 usage(void)
 186 {
 187         fprintf(stderr,
 188 "usage: ssh [-1246AaCfgKkMNnqsTtVvXxYy] [-b bind_address] [-c cipher_spec]\n"
 189 "           [-D [bind_address:]port] [-e escape_char] [-F configfile]\n"
 190 "           [-i identity_file] [-L [bind_address:]port:host:hostport]\n"
 191 "           [-l login_name] [-m mac_spec] [-O ctl_cmd] [-o option] [-p port]\n"
 192 "           [-R [bind_address:]port:host:hostport] [-S ctl_path]\n"
 193 "           [-W host:port] [-w local_tun[:remote_tun]]\n"
 194 "           [user@]hostname [command]\n"
 195         );
 196         exit(255);
 197 }
 198
 199 static int ssh_session(void);
 200 static int ssh_session2(void);
 201 static void load_public_identity_files(void);
 202
 203 /* from muxclient.c */
 204 void muxclient(const char *);
 205 void muxserver_listen(void);
 206
 207 /*
 208  * Main program for the ssh client.
 209  */
 210 int
 211 main(int ac, char **av)
 212 {
 213         int i, r, opt, exit_status, use_syslog;
 214         char *p, *cp, *line, *argv0, buf[MAXPATHLEN];
 215         struct stat st;
 216         struct passwd *pw;
 217         int dummy, timeout_ms;
 218         extern int optind, optreset;
 219         extern char *optarg;
 220         struct servent *sp;
 221         Forward fwd;
 222
 223         /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
 224         sanitise_stdfd();
 225
 226         __progname = ssh_get_progname(av[0]);
 227         init_rng();
 228
 229         /*
 230          * Save the original real uid.  It will be needed later (uid-swapping
 231          * may clobber the real uid).
 232          */
 233         original_real_uid = getuid();
 234         original_effective_uid = geteuid();
 235
 236         /*
 237          * Use uid-swapping to give up root privileges for the duration of
 238          * option processing.  We will re-instantiate the rights when we are
 239          * ready to create the privileged port, and will permanently drop
 240          * them when the port has been created (actually, when the connection
 241          * has been made, as we may need to create the port several times).
 242          */
 243         PRIV_END;
 244
 245 #ifdef HAVE_SETRLIMIT
 246         /* If we are installed setuid root be careful to not drop core. */
 247         if (original_real_uid != original_effective_uid) {
 248                 struct rlimit rlim;
 249                 rlim.rlim_cur = rlim.rlim_max = 0;
 250                 if (setrlimit(RLIMIT_CORE, &rlim) < 0)
 251                         fatal("setrlimit failed: %.100s", strerror(errno));
 252         }
 253 #endif
 254         /* Get user data. */
 255         pw = getpwuid(original_real_uid);
 256         if (!pw) {
 257                 logit("You don't exist, go away!");
 258                 exit(255);
 259         }
 260         /* Take a copy of the returned structure. */
 261         pw = pwcopy(pw);
 262
 263         /*
 264          * Set our umask to something reasonable, as some files are created
 265          * with the default umask.  This will make them world-readable but
 266          * writable only by the owner, which is ok for all files for which we
 267          * don't set the modes explicitly.
 268          */
 269         umask(022);
 270
 271         /*
 272          * Initialize option structure to indicate that no values have been
 273          * set.
 274          */
 275         initialize_options(&options);
 276
 277         /* Parse command-line arguments. */
 278         host = NULL;
 279         use_syslog = 0;
 280         argv0 = av[0];
 281
 282  again:
 283         while ((opt = getopt(ac, av, "1246ab:c:e:fgi:kl:m:no:p:qstvx"
 284             "ACD:F:I:KL:MNO:PR:S:TVw:W:XYy")) != -1) {
 285                 switch (opt) {
 286                 case '1':
 287                         options.protocol = SSH_PROTO_1;
 288                         break;
 289                 case '2':
 290                         options.protocol = SSH_PROTO_2;
 291                         break;
 292                 case '4':
 293                         options.address_family = AF_INET;
 294                         break;
 295                 case '6':
 296                         options.address_family = AF_INET6;
 297                         break;
 298                 case 'n':
 299                         stdin_null_flag = 1;
 300                         break;
 301                 case 'f':
 302                         fork_after_authentication_flag = 1;
 303                         stdin_null_flag = 1;
 304                         break;
 305                 case 'x':
 306                         options.forward_x11 = 0;
 307                         break;
 308                 case 'X':
 309                         options.forward_x11 = 1;
 310                         break;
 311                 case 'y':
 312                         use_syslog = 1;
 313                         break;
 314                 case 'Y':
 315                         options.forward_x11 = 1;
 316                         options.forward_x11_trusted = 1;
 317                         break;
 318                 case 'g':
 319                         options.gateway_ports = 1;
 320                         break;
 321                 case 'O':
 322                         if (stdio_forward_host != NULL)
 323                                 fatal("Cannot specify multiplexing "
 324                                     "command with -W");
 325                         else if (muxclient_command != 0)
 326                                 fatal("Multiplexing command already specified");
 327                         if (strcmp(optarg, "check") == 0)
 328                                 muxclient_command = SSHMUX_COMMAND_ALIVE_CHECK;
 329                         else if (strcmp(optarg, "exit") == 0)
 330                                 muxclient_command = SSHMUX_COMMAND_TERMINATE;
 331                         else
 332                                 fatal("Invalid multiplex command.");
 333                         break;
 334                 case 'P':       /* deprecated */
 335                         options.use_privileged_port = 0;
 336                         break;
 337                 case 'a':
 338                         options.forward_agent = 0;
 339                         break;
 340                 case 'A':
 341                         options.forward_agent = 1;
 342                         break;
 343                 case 'k':
 344                         options.gss_deleg_creds = 0;
 345                         break;
 346                 case 'K':
 347                         options.gss_authentication = 1;
 348                         options.gss_deleg_creds = 1;
 349                         break;
 350                 case 'i':
 351                         if (stat(optarg, &st) < 0) {
 352                                 fprintf(stderr, "Warning: Identity file %s "
 353                                     "not accessible: %s.\n", optarg,
 354                                     strerror(errno));
 355                                 break;
 356                         }
 357                         if (options.num_identity_files >=
 358                             SSH_MAX_IDENTITY_FILES)
 359                                 fatal("Too many identity files specified "
 360                                     "(max %d)", SSH_MAX_IDENTITY_FILES);
 361                         options.identity_files[options.num_identity_files++] =
 362                             xstrdup(optarg);
 363                         break;
 364                 case 'I':
 365 #ifdef SMARTCARD
 366                         options.smartcard_device = xstrdup(optarg);
 367 #else
 368                         fprintf(stderr, "no support for smartcards.\n");
 369 #endif
 370                         break;
 371                 case 't':
 372                         if (tty_flag)
 373                                 force_tty_flag = 1;
 374                         tty_flag = 1;
 375                         break;
 376                 case 'v':
 377                         if (debug_flag == 0) {
 378                                 debug_flag = 1;
 379                                 options.log_level = SYSLOG_LEVEL_DEBUG1;
 380                         } else {
 381                                 if (options.log_level < SYSLOG_LEVEL_DEBUG3)
 382                                         options.log_level++;
 383                                 break;
 384                         }
 385                         /* FALLTHROUGH */
 386                 case 'V':
 387                         fprintf(stderr, "%s, %s\n",
 388                             SSH_RELEASE, SSLeay_version(SSLEAY_VERSION));
 389                         if (opt == 'V')
 390                                 exit(0);
 391                         break;
 392                 case 'w':
 393                         if (options.tun_open == -1)
 394                                 options.tun_open = SSH_TUNMODE_DEFAULT;
 395                         options.tun_local = a2tun(optarg, &options.tun_remote);
 396                         if (options.tun_local == SSH_TUNID_ERR) {
 397                                 fprintf(stderr,
 398                                     "Bad tun device '%s'\n", optarg);
 399                                 exit(255);
 400                         }
 401                         break;
 402                 case 'W':
 403                         if (stdio_forward_host != NULL)
 404                                 fatal("stdio forward already specified");
 405                         if (muxclient_command != 0)
 406                                 fatal("Cannot specify stdio forward with -O");
 407                         if (parse_forward(&fwd, optarg, 1, 0)) {
 408                                 stdio_forward_host = fwd.listen_host;
 409                                 stdio_forward_port = fwd.listen_port;
 410                                 xfree(fwd.connect_host);
 411                         } else {
 412                                 fprintf(stderr,
 413                                     "Bad stdio forwarding specification '%s'\n",
 414                                     optarg);
 415                                 exit(255);
 416                         }
 417                         no_tty_flag = 1;
 418                         no_shell_flag = 1;
 419                         options.clear_forwardings = 1;
 420                         options.exit_on_forward_failure = 1;
 421                         break;
 422                 case 'q':
 423                         options.log_level = SYSLOG_LEVEL_QUIET;
 424                         break;
 425                 case 'e':
 426                         if (optarg[0] == '^' && optarg[2] == 0 &&
 427                             (u_char) optarg[1] >= 64 &&
 428                             (u_char) optarg[1] < 128)
 429                                 options.escape_char = (u_char) optarg[1] & 31;
 430                         else if (strlen(optarg) == 1)
 431                                 options.escape_char = (u_char) optarg[0];
 432                         else if (strcmp(optarg, "none") == 0)
 433                                 options.escape_char = SSH_ESCAPECHAR_NONE;
 434                         else {
 435                                 fprintf(stderr, "Bad escape character '%s'.\n",
 436                                     optarg);
 437                                 exit(255);
 438                         }
 439                         break;
 440                 case 'c':
 441                         if (ciphers_valid(optarg)) {
 442                                 /* SSH2 only */
 443                                 options.ciphers = xstrdup(optarg);
 444                                 options.cipher = SSH_CIPHER_INVALID;
 445                         } else {
 446                                 /* SSH1 only */
 447                                 options.cipher = cipher_number(optarg);
 448                                 if (options.cipher == -1) {
 449                                         fprintf(stderr,
 450                                             "Unknown cipher type '%s'\n",
 451                                             optarg);
 452                                         exit(255);
 453                                 }
 454                                 if (options.cipher == SSH_CIPHER_3DES)
 455                                         options.ciphers = "3des-cbc";
 456                                 else if (options.cipher == SSH_CIPHER_BLOWFISH)
 457                                         options.ciphers = "blowfish-cbc";
 458                                 else
 459                                         options.ciphers = (char *)-1;
 460                         }
 461                         break;
 462                 case 'm':
 463                         if (mac_valid(optarg))
 464                                 options.macs = xstrdup(optarg);
 465                         else {
 466                                 fprintf(stderr, "Unknown mac type '%s'\n",
 467                                     optarg);
 468                                 exit(255);
 469                         }
 470                         break;
 471                 case 'M':
 472                         if (options.control_master == SSHCTL_MASTER_YES)
 473                                 options.control_master = SSHCTL_MASTER_ASK;
 474                         else
 475                                 options.control_master = SSHCTL_MASTER_YES;
 476                         break;
 477                 case 'p':
 478                         options.port = a2port(optarg);
 479                         if (options.port <= 0) {
 480                                 fprintf(stderr, "Bad port '%s'\n", optarg);
 481                                 exit(255);
 482                         }
 483                         break;
 484                 case 'l':
 485                         options.user = optarg;
 486                         break;
 487
 488                 case 'L':
 489                         if (parse_forward(&fwd, optarg, 0, 0))
 490                                 add_local_forward(&options, &fwd);
 491                         else {
 492                                 fprintf(stderr,
 493                                     "Bad local forwarding specification '%s'\n",
 494                                     optarg);
 495                                 exit(255);
 496                         }
 497                         break;
 498
 499                 case 'R':
 500                         if (parse_forward(&fwd, optarg, 0, 1)) {
 501                                 add_remote_forward(&options, &fwd);
 502                         } else {
 503                                 fprintf(stderr,
 504                                     "Bad remote forwarding specification "
 505                                     "'%s'\n", optarg);
 506                                 exit(255);
 507                         }
 508                         break;
 509
 510                 case 'D':
 511                         if (parse_forward(&fwd, optarg, 1, 0)) {
 512                                 add_local_forward(&options, &fwd);
 513                         } else {
 514                                 fprintf(stderr,
 515                                     "Bad dynamic forwarding specification "
 516                                     "'%s'\n", optarg);
 517                                 exit(255);
 518                         }
 519                         break;
 520
 521                 case 'C':
 522                         options.compression = 1;
 523                         break;
 524                 case 'N':
 525                         no_shell_flag = 1;
 526                         no_tty_flag = 1;
 527                         break;
 528                 case 'T':
 529                         no_tty_flag = 1;
 530                         break;
 531                 case 'o':
 532                         dummy = 1;
 533                         line = xstrdup(optarg);
 534                         if (process_config_line(&options, host ? host : "",
 535                             line, "command-line", 0, &dummy) != 0)
 536                                 exit(255);
 537                         xfree(line);
 538                         break;
 539                 case 's':
 540                         subsystem_flag = 1;
 541                         break;
 542                 case 'S':
 543                         if (options.control_path != NULL)
 544                                 free(options.control_path);
 545                         options.control_path = xstrdup(optarg);
 546                         break;
 547                 case 'b':
 548                         options.bind_address = optarg;
 549                         break;
 550                 case 'F':
 551                         config = optarg;
 552                         break;
 553                 default:
 554                         usage();
 555                 }
 556         }
 557
 558         ac -= optind;
 559         av += optind;
 560
 561         if (ac > 0 && !host) {
 562                 if (strrchr(*av, '@')) {
 563                         p = xstrdup(*av);
 564                         cp = strrchr(p, '@');
 565                         if (cp == NULL || cp == p)
 566                                 usage();
 567                         options.user = p;
 568                         *cp = '\0';
 569                         host = ++cp;
 570                 } else
 571                         host = *av;
 572                 if (ac > 1) {
 573                         optind = optreset = 1;
 574                         goto again;
 575                 }
 576                 ac--, av++;
 577         }
 578
 579         /* Check that we got a host name. */
 580         if (!host)
 581                 usage();
 582
 583         SSLeay_add_all_algorithms();
 584         ERR_load_crypto_strings();
 585
 586         /* Initialize the command to execute on remote host. */
 587         buffer_init(&command);
 588
 589         /*
 590          * Save the command to execute on the remote host in a buffer. There
 591          * is no limit on the length of the command, except by the maximum
 592          * packet size.  Also sets the tty flag if there is no command.
 593          */
 594         if (!ac) {
 595                 /* No command specified - execute shell on a tty. */
 596                 tty_flag = 1;
 597                 if (subsystem_flag) {
 598                         fprintf(stderr,
 599                             "You must specify a subsystem to invoke.\n");
 600                         usage();
 601                 }
 602         } else {
 603                 /* A command has been specified.  Store it into the buffer. */
 604                 for (i = 0; i < ac; i++) {
 605                         if (i)
 606                                 buffer_append(&command, " ", 1);
 607                         buffer_append(&command, av[i], strlen(av[i]));
 608                 }
 609         }
 610
 611         /* Cannot fork to background if no command. */
 612         if (fork_after_authentication_flag && buffer_len(&command) == 0 &&
 613             !no_shell_flag)
 614                 fatal("Cannot fork into background without a command "
 615                     "to execute.");
 616
 617         /* Allocate a tty by default if no command specified. */
 618         if (buffer_len(&command) == 0)
 619                 tty_flag = 1;
 620
 621         /* Force no tty */
 622         if (no_tty_flag)
 623                 tty_flag = 0;
 624         /* Do not allocate a tty if stdin is not a tty. */
 625         if ((!isatty(fileno(stdin)) || stdin_null_flag) && !force_tty_flag) {
 626                 if (tty_flag)
 627                         logit("Pseudo-terminal will not be allocated because "
 628                             "stdin is not a terminal.");
 629                 tty_flag = 0;
 630         }
 631
 632         /*
 633          * Initialize "log" output.  Since we are the client all output
 634          * actually goes to stderr.
 635          */
 636         log_init(argv0,
 637             options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level,
 638             SYSLOG_FACILITY_USER, !use_syslog);
 639
 640         /*
 641          * Read per-user configuration file.  Ignore the system wide config
 642          * file if the user specifies a config file on the command line.
 643          */
 644         if (config != NULL) {
 645                 if (!read_config_file(config, host, &options, 0))
 646                         fatal("Can't open user config file %.100s: "
 647                             "%.100s", config, strerror(errno));
 648         } else {
 649                 r = snprintf(buf, sizeof buf, "%s/%s", pw->pw_dir,
 650                     _PATH_SSH_USER_CONFFILE);
 651                 if (r > 0 && (size_t)r < sizeof(buf))
 652                         (void)read_config_file(buf, host, &options, 1);
 653
 654                 /* Read systemwide configuration file after use config. */
 655                 (void)read_config_file(_PATH_HOST_CONFIG_FILE, host,
 656                     &options, 0);
 657         }
 658
 659         /* Fill configuration defaults. */
 660         fill_default_options(&options);
 661
 662         channel_set_af(options.address_family);
 663
 664         /* reinit */
 665         log_init(argv0, options.log_level, SYSLOG_FACILITY_USER, !use_syslog);
 666
 667         seed_rng();
 668
 669         if (options.user == NULL)
 670                 options.user = xstrdup(pw->pw_name);
 671
 672         /* Get default port if port has not been set. */
 673         if (options.port == 0) {
 674                 sp = getservbyname(SSH_SERVICE_NAME, "tcp");
 675                 options.port = sp ? ntohs(sp->s_port) : SSH_DEFAULT_PORT;
 676         }
 677
 678         if (options.local_command != NULL) {
 679                 char thishost[NI_MAXHOST];
 680
 681                 if (gethostname(thishost, sizeof(thishost)) == -1)
 682                         fatal("gethostname: %s", strerror(errno));
 683                 snprintf(buf, sizeof(buf), "%d", options.port);
 684                 debug3("expanding LocalCommand: %s", options.local_command);
 685                 cp = options.local_command;
 686                 options.local_command = percent_expand(cp, "d", pw->pw_dir,
 687                     "h", options.hostname? options.hostname : host,
 688                     "l", thishost, "n", host, "r", options.user, "p", buf,
 689                     "u", pw->pw_name, (char *)NULL);
 690                 debug3("expanded LocalCommand: %s", options.local_command);
 691                 xfree(cp);
 692         }
 693
 694         if (options.hostname != NULL)
 695                 host = options.hostname;
 696
 697         /* force lowercase for hostkey matching */
 698         if (options.host_key_alias != NULL) {
 699                 for (p = options.host_key_alias; *p; p++)
 700                         if (isupper(*p))
 701                                 *p = (char)tolower(*p);
 702         }
 703
 704         if (options.proxy_command != NULL &&
 705             strcmp(options.proxy_command, "none") == 0) {
 706                 xfree(options.proxy_command);
 707                 options.proxy_command = NULL;
 708         }
 709         if (options.control_path != NULL &&
 710             strcmp(options.control_path, "none") == 0) {
 711                 xfree(options.control_path);
 712                 options.control_path = NULL;
 713         }
 714
 715         if (options.control_path != NULL) {
 716                 char thishost[NI_MAXHOST];
 717
 718                 if (gethostname(thishost, sizeof(thishost)) == -1)
 719                         fatal("gethostname: %s", strerror(errno));
 720                 snprintf(buf, sizeof(buf), "%d", options.port);
 721                 cp = tilde_expand_filename(options.control_path,
 722                     original_real_uid);
 723                 xfree(options.control_path);
 724                 options.control_path = percent_expand(cp, "p", buf, "h", host,
 725                     "r", options.user, "l", thishost, (char *)NULL);
 726                 xfree(cp);
 727         }
 728         if (muxclient_command != 0 && options.control_path == NULL)
 729                 fatal("No ControlPath specified for \"-O\" command");
 730         if (options.control_path != NULL)
 731                 muxclient(options.control_path);
 732
 733         timeout_ms = options.connection_timeout * 1000;
 734
 735         /* Open a connection to the remote host. */
 736         if (ssh_connect(host, &hostaddr, options.port,
 737             options.address_family, options.connection_attempts, &timeout_ms,
 738             options.tcp_keep_alive,
 739 #ifdef HAVE_CYGWIN
 740             options.use_privileged_port,
 741 #else
 742             original_effective_uid == 0 && options.use_privileged_port,
 743 #endif
 744             options.proxy_command) != 0)
 745                 exit(255);
 746
 747         if (timeout_ms > 0)
 748                 debug3("timeout: %d ms remain after connect", timeout_ms);
 749
 750         /*
 751          * If we successfully made the connection, load the host private key
 752          * in case we will need it later for combined rsa-rhosts
 753          * authentication. This must be done before releasing extra
 754          * privileges, because the file is only readable by root.
 755          * If we cannot access the private keys, load the public keys
 756          * instead and try to execute the ssh-keysign helper instead.
 757          */
 758         sensitive_data.nkeys = 0;
 759         sensitive_data.keys = NULL;
 760         sensitive_data.external_keysign = 0;
 761         if (options.rhosts_rsa_authentication ||
 762             options.hostbased_authentication) {
 763                 sensitive_data.nkeys = 3;
 764                 sensitive_data.keys = xcalloc(sensitive_data.nkeys,
 765                     sizeof(Key));
 766
 767                 PRIV_START;
 768                 sensitive_data.keys[0] = key_load_private_type(KEY_RSA1,
 769                     _PATH_HOST_KEY_FILE, "", NULL, NULL);
 770                 sensitive_data.keys[1] = key_load_private_type(KEY_DSA,
 771                     _PATH_HOST_DSA_KEY_FILE, "", NULL, NULL);
 772                 sensitive_data.keys[2] = key_load_private_type(KEY_RSA,
 773                     _PATH_HOST_RSA_KEY_FILE, "", NULL, NULL);
 774                 PRIV_END;
 775
 776                 if (options.hostbased_authentication == 1 &&
 777                     sensitive_data.keys[0] == NULL &&
 778                     sensitive_data.keys[1] == NULL &&
 779                     sensitive_data.keys[2] == NULL) {
 780                         sensitive_data.keys[1] = key_load_public(
 781                             _PATH_HOST_DSA_KEY_FILE, NULL);
 782                         sensitive_data.keys[2] = key_load_public(
 783                             _PATH_HOST_RSA_KEY_FILE, NULL);
 784                         sensitive_data.external_keysign = 1;
 785                 }
 786         }
 787         /*
 788          * Get rid of any extra privileges that we may have.  We will no
 789          * longer need them.  Also, extra privileges could make it very hard
 790          * to read identity files and other non-world-readable files from the
 791          * user's home directory if it happens to be on a NFS volume where
 792          * root is mapped to nobody.
 793          */
 794         if (original_effective_uid == 0) {
 795                 PRIV_START;
 796                 permanently_set_uid(pw);
 797         }
 798
 799         /*
 800          * Now that we are back to our own permissions, create ~/.ssh
 801          * directory if it doesn't already exist.
 802          */
 803         r = snprintf(buf, sizeof buf, "%s%s%s", pw->pw_dir,
 804             strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR);
 805         if (r > 0 && (size_t)r < sizeof(buf) && stat(buf, &st) < 0)
 806                 if (mkdir(buf, 0700) < 0)
 807                         error("Could not create directory '%.200s'.", buf);
 808
 809         /* load options.identity_files */
 810         load_public_identity_files();
 811
 812         /* Expand ~ in known host file names. */
 813         /* XXX mem-leaks: */
 814         options.system_hostfile =
 815             tilde_expand_filename(options.system_hostfile, original_real_uid);
 816         options.user_hostfile =
 817             tilde_expand_filename(options.user_hostfile, original_real_uid);
 818         options.system_hostfile2 =
 819             tilde_expand_filename(options.system_hostfile2, original_real_uid);
 820         options.user_hostfile2 =
 821             tilde_expand_filename(options.user_hostfile2, original_real_uid);
 822
 823         signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
 824
 825         /* Log into the remote system.  Never returns if the login fails. */
 826         ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr,
 827             pw, timeout_ms);
 828
 829         /* We no longer need the private host keys.  Clear them now. */
 830         if (sensitive_data.nkeys != 0) {
 831                 for (i = 0; i < sensitive_data.nkeys; i++) {
 832                         if (sensitive_data.keys[i] != NULL) {
 833                                 /* Destroys contents safely */
 834                                 debug3("clear hostkey %d", i);
 835                                 key_free(sensitive_data.keys[i]);
 836                                 sensitive_data.keys[i] = NULL;
 837                         }
 838                 }
 839                 xfree(sensitive_data.keys);
 840         }
 841         for (i = 0; i < options.num_identity_files; i++) {
 842                 if (options.identity_files[i]) {
 843                         xfree(options.identity_files[i]);
 844                         options.identity_files[i] = NULL;
 845                 }
 846                 if (options.identity_keys[i]) {
 847                         key_free(options.identity_keys[i]);
 848                         options.identity_keys[i] = NULL;
 849                 }
 850         }
 851
 852         exit_status = compat20 ? ssh_session2() : ssh_session();
 853         packet_close();
 854
 855         if (options.control_path != NULL && muxserver_sock != -1)
 856                 unlink(options.control_path);
 857
 858         /*
 859          * Send SIGHUP to proxy command if used. We don't wait() in
 860          * case it hangs and instead rely on init to reap the child
 861          */
 862         if (proxy_command_pid > 1)
 863                 kill(proxy_command_pid, SIGHUP);
 864
 865         return exit_status;
 866 }
 867
 868 /* Callback for remote forward global requests */
 869 static void
 870 ssh_confirm_remote_forward(int type, u_int32_t seq, void *ctxt)
 871 {
 872         Forward *rfwd = (Forward *)ctxt;
 873
 874         /* XXX verbose() on failure? */
 875         debug("remote forward %s for: listen %d, connect %s:%d",
 876             type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
 877             rfwd->listen_port, rfwd->connect_host, rfwd->connect_port);
 878         if (type == SSH2_MSG_REQUEST_SUCCESS && rfwd->listen_port == 0) {
 879                 logit("Allocated port %u for remote forward to %s:%d",
 880                         packet_get_int(),
 881                         rfwd->connect_host, rfwd->connect_port);
 882         }
 883
 884         if (type == SSH2_MSG_REQUEST_FAILURE) {
 885                 if (options.exit_on_forward_failure)
 886                         fatal("Error: remote port forwarding failed for "
 887                             "listen port %d", rfwd->listen_port);
 888                 else
 889                         logit("Warning: remote port forwarding failed for "
 890                             "listen port %d", rfwd->listen_port);
 891         }
 892         if (++remote_forward_confirms_received == options.num_remote_forwards) {
 893                 debug("All remote forwarding requests processed");
 894                 if (fork_after_authentication_flag) {
 895                         fork_after_authentication_flag = 0;
 896                         if (daemon(1, 1) < 0)
 897                                 fatal("daemon() failed: %.200s",
 898                                     strerror(errno));
 899                 }
 900         }
 901 }
 902
 903 static void
 904 client_cleanup_stdio_fwd(int id, void *arg)
 905 {
 906         debug("stdio forwarding: done");
 907         cleanup_exit(0);
 908 }
 909
 910 static int
 911 client_setup_stdio_fwd(const char *host_to_connect, u_short port_to_connect)
 912 {
 913         Channel *c;
 914         int in, out;
 915
 916         debug3("client_setup_stdio_fwd %s:%d", host_to_connect,
 917             port_to_connect);
 918
 919         in = dup(STDIN_FILENO);
 920         out = dup(STDOUT_FILENO);
 921         if (in < 0 || out < 0)
 922                 fatal("channel_connect_stdio_fwd: dup() in/out failed");
 923
 924         if ((c = channel_connect_stdio_fwd(host_to_connect, port_to_connect,
 925             in, out)) == NULL)
 926                 return 0;
 927         channel_register_cleanup(c->self, client_cleanup_stdio_fwd, 0);
 928         return 1;
 929 }
 930
 931 static void
 932 ssh_init_forwarding(void)
 933 {
 934         int success = 0;
 935         int i;
 936
 937         if (stdio_forward_host != NULL) {
 938                 if (!compat20) {
 939                         fatal("stdio forwarding require Protocol 2");
 940                 }
 941                 if (!client_setup_stdio_fwd(stdio_forward_host,
 942                     stdio_forward_port))
 943                         fatal("Failed to connect in stdio forward mode.");
 944         }
 945
 946         /* Initiate local TCP/IP port forwardings. */
 947         for (i = 0; i < options.num_local_forwards; i++) {
 948                 debug("Local connections to %.200s:%d forwarded to remote "
 949                     "address %.200s:%d",
 950                     (options.local_forwards[i].listen_host == NULL) ?
 951                     (options.gateway_ports ? "*" : "LOCALHOST") :
 952                     options.local_forwards[i].listen_host,
 953                     options.local_forwards[i].listen_port,
 954                     options.local_forwards[i].connect_host,
 955                     options.local_forwards[i].connect_port);
 956                 success += channel_setup_local_fwd_listener(
 957                     options.local_forwards[i].listen_host,
 958                     options.local_forwards[i].listen_port,
 959                     options.local_forwards[i].connect_host,
 960                     options.local_forwards[i].connect_port,
 961                     options.gateway_ports);
 962         }
 963         if (i > 0 && success != i && options.exit_on_forward_failure)
 964                 fatal("Could not request local forwarding.");
 965         if (i > 0 && success == 0)
 966                 error("Could not request local forwarding.");
 967
 968         /* Initiate remote TCP/IP port forwardings. */
 969         for (i = 0; i < options.num_remote_forwards; i++) {
 970                 debug("Remote connections from %.200s:%d forwarded to "
 971                     "local address %.200s:%d",
 972                     (options.remote_forwards[i].listen_host == NULL) ?
 973                     "LOCALHOST" : options.remote_forwards[i].listen_host,
 974                     options.remote_forwards[i].listen_port,
 975                     options.remote_forwards[i].connect_host,
 976                     options.remote_forwards[i].connect_port);
 977                 if (channel_request_remote_forwarding(
 978                     options.remote_forwards[i].listen_host,
 979                     options.remote_forwards[i].listen_port,
 980                     options.remote_forwards[i].connect_host,
 981                     options.remote_forwards[i].connect_port) < 0) {
 982                         if (options.exit_on_forward_failure)
 983                                 fatal("Could not request remote forwarding.");
 984                         else
 985                                 logit("Warning: Could not request remote "
 986                                     "forwarding.");
 987                 }
 988                 client_register_global_confirm(ssh_confirm_remote_forward,
 989                     &options.remote_forwards[i]);
 990         }
 991
 992         /* Initiate tunnel forwarding. */
 993         if (options.tun_open != SSH_TUNMODE_NO) {
 994                 if (client_request_tun_fwd(options.tun_open,
 995                     options.tun_local, options.tun_remote) == -1) {
 996                         if (options.exit_on_forward_failure)
 997                                 fatal("Could not request tunnel forwarding.");
 998                         else
 999                                 error("Could not request tunnel forwarding.");
1000                 }
1001         }
1002 }
1003
1004 static void
1005 check_agent_present(void)
1006 {
1007         if (options.forward_agent) {
1008                 /* Clear agent forwarding if we don't have an agent. */
1009                 if (!ssh_agent_present())
1010                         options.forward_agent = 0;
1011         }
1012 }
1013
1014 static int
1015 ssh_session(void)
1016 {
1017         int type;
1018         int interactive = 0;
1019         int have_tty = 0;
1020         struct winsize ws;
1021         char *cp;
1022         const char *display;
1023
1024         /* Enable compression if requested. */
1025         if (options.compression) {
1026                 debug("Requesting compression at level %d.",
1027                     options.compression_level);
1028
1029                 if (options.compression_level < 1 ||
1030                     options.compression_level > 9)
1031                         fatal("Compression level must be from 1 (fast) to "
1032                             "9 (slow, best).");
1033
1034                 /* Send the request. */
1035                 packet_start(SSH_CMSG_REQUEST_COMPRESSION);
1036                 packet_put_int(options.compression_level);
1037                 packet_send();
1038                 packet_write_wait();
1039                 type = packet_read();
1040                 if (type == SSH_SMSG_SUCCESS)
1041                         packet_start_compression(options.compression_level);
1042                 else if (type == SSH_SMSG_FAILURE)
1043                         logit("Warning: Remote host refused compression.");
1044                 else
1045                         packet_disconnect("Protocol error waiting for "
1046                             "compression response.");
1047         }
1048         /* Allocate a pseudo tty if appropriate. */
1049         if (tty_flag) {
1050                 debug("Requesting pty.");
1051
1052                 /* Start the packet. */
1053                 packet_start(SSH_CMSG_REQUEST_PTY);
1054
1055                 /* Store TERM in the packet.  There is no limit on the
1056                    length of the string. */
1057                 cp = getenv("TERM");
1058                 if (!cp)
1059                         cp = "";
1060                 packet_put_cstring(cp);
1061
1062                 /* Store window size in the packet. */
1063                 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
1064                         memset(&ws, 0, sizeof(ws));
1065                 packet_put_int((u_int)ws.ws_row);
1066                 packet_put_int((u_int)ws.ws_col);
1067                 packet_put_int((u_int)ws.ws_xpixel);
1068                 packet_put_int((u_int)ws.ws_ypixel);
1069
1070                 /* Store tty modes in the packet. */
1071                 tty_make_modes(fileno(stdin), NULL);
1072
1073                 /* Send the packet, and wait for it to leave. */
1074                 packet_send();
1075                 packet_write_wait();
1076
1077                 /* Read response from the server. */
1078                 type = packet_read();
1079                 if (type == SSH_SMSG_SUCCESS) {
1080                         interactive = 1;
1081                         have_tty = 1;
1082                 } else if (type == SSH_SMSG_FAILURE)
1083                         logit("Warning: Remote host failed or refused to "
1084                             "allocate a pseudo tty.");
1085                 else
1086                         packet_disconnect("Protocol error waiting for pty "
1087                             "request response.");
1088         }
1089         /* Request X11 forwarding if enabled and DISPLAY is set. */
1090         display = getenv("DISPLAY");
1091         if (options.forward_x11 && display != NULL) {
1092                 char *proto, *data;
1093                 /* Get reasonable local authentication information. */
1094                 client_x11_get_proto(display, options.xauth_location,
1095                     options.forward_x11_trusted, &proto, &data);
1096                 /* Request forwarding with authentication spoofing. */
1097                 debug("Requesting X11 forwarding with authentication "
1098                     "spoofing.");
1099                 x11_request_forwarding_with_spoofing(0, display, proto, data);
1100
1101                 /* Read response from the server. */
1102                 type = packet_read();
1103                 if (type == SSH_SMSG_SUCCESS) {
1104                         interactive = 1;
1105                 } else if (type == SSH_SMSG_FAILURE) {
1106                         logit("Warning: Remote host denied X11 forwarding.");
1107                 } else {
1108                         packet_disconnect("Protocol error waiting for X11 "
1109                             "forwarding");
1110                 }
1111         }
1112         /* Tell the packet module whether this is an interactive session. */
1113         packet_set_interactive(interactive);
1114
1115         /* Request authentication agent forwarding if appropriate. */
1116         check_agent_present();
1117
1118         if (options.forward_agent) {
1119                 debug("Requesting authentication agent forwarding.");
1120                 auth_request_forwarding();
1121
1122                 /* Read response from the server. */
1123                 type = packet_read();
1124                 packet_check_eom();
1125                 if (type != SSH_SMSG_SUCCESS)
1126                         logit("Warning: Remote host denied authentication agent forwarding.");
1127         }
1128
1129         /* Initiate port forwardings. */
1130         ssh_init_forwarding();
1131
1132         /* Execute a local command */
1133         if (options.local_command != NULL &&
1134             options.permit_local_command)
1135                 ssh_local_cmd(options.local_command);
1136
1137         /*
1138          * If requested and we are not interested in replies to remote
1139          * forwarding requests, then let ssh continue in the background.
1140          */
1141         if (fork_after_authentication_flag &&
1142             (!options.exit_on_forward_failure ||
1143             options.num_remote_forwards == 0)) {
1144                 fork_after_authentication_flag = 0;
1145                 if (daemon(1, 1) < 0)
1146                         fatal("daemon() failed: %.200s", strerror(errno));
1147         }
1148
1149         /*
1150          * If a command was specified on the command line, execute the
1151          * command now. Otherwise request the server to start a shell.
1152          */
1153         if (buffer_len(&command) > 0) {
1154                 int len = buffer_len(&command);
1155                 if (len > 900)
1156                         len = 900;
1157                 debug("Sending command: %.*s", len,
1158                     (u_char *)buffer_ptr(&command));
1159                 packet_start(SSH_CMSG_EXEC_CMD);
1160                 packet_put_string(buffer_ptr(&command), buffer_len(&command));
1161                 packet_send();
1162                 packet_write_wait();
1163         } else {
1164                 debug("Requesting shell.");
1165                 packet_start(SSH_CMSG_EXEC_SHELL);
1166                 packet_send();
1167                 packet_write_wait();
1168         }
1169
1170         /* Enter the interactive session. */
1171         return client_loop(have_tty, tty_flag ?
1172             options.escape_char : SSH_ESCAPECHAR_NONE, 0);
1173 }
1174
1175 /* request pty/x11/agent/tcpfwd/shell for channel */
1176 static void
1177 ssh_session2_setup(int id, void *arg)
1178 {
1179         extern char **environ;
1180         const char *display;
1181         int interactive = tty_flag;
1182
1183         display = getenv("DISPLAY");
1184         if (options.forward_x11 && display != NULL) {
1185                 char *proto, *data;
1186                 /* Get reasonable local authentication information. */
1187                 client_x11_get_proto(display, options.xauth_location,
1188                     options.forward_x11_trusted, &proto, &data);
1189                 /* Request forwarding with authentication spoofing. */
1190                 debug("Requesting X11 forwarding with authentication "
1191                     "spoofing.");
1192                 x11_request_forwarding_with_spoofing(id, display, proto, data);
1193                 interactive = 1;
1194                 /* XXX wait for reply */
1195         }
1196
1197         check_agent_present();
1198         if (options.forward_agent) {
1199                 debug("Requesting authentication agent forwarding.");
1200                 channel_request_start(id, "auth-agent-req@openssh.com", 0);
1201                 packet_send();
1202         }
1203
1204         client_session2_setup(id, tty_flag, subsystem_flag, getenv("TERM"),
1205             NULL, fileno(stdin), &command, environ);
1206
1207         packet_set_interactive(interactive);
1208 }
1209
1210 /* open new channel for a session */
1211 static int
1212 ssh_session2_open(void)
1213 {
1214         Channel *c;
1215         int window, packetmax, in, out, err;
1216
1217         if (stdin_null_flag) {
1218                 in = open(_PATH_DEVNULL, O_RDONLY);
1219         } else {
1220                 in = dup(STDIN_FILENO);
1221         }
1222         out = dup(STDOUT_FILENO);
1223         err = dup(STDERR_FILENO);
1224
1225         if (in < 0 || out < 0 || err < 0)
1226                 fatal("dup() in/out/err failed");
1227
1228         /* enable nonblocking unless tty */
1229         if (!isatty(in))
1230                 set_nonblock(in);
1231         if (!isatty(out))
1232                 set_nonblock(out);
1233         if (!isatty(err))
1234                 set_nonblock(err);
1235
1236         window = CHAN_SES_WINDOW_DEFAULT;
1237         packetmax = CHAN_SES_PACKET_DEFAULT;
1238         if (tty_flag) {
1239                 window >>= 1;
1240                 packetmax >>= 1;
1241         }
1242         c = channel_new(
1243             "session", SSH_CHANNEL_OPENING, in, out, err,
1244             window, packetmax, CHAN_EXTENDED_WRITE,
1245             "client-session", /*nonblock*/0);
1246
1247         debug3("ssh_session2_open: channel_new: %d", c->self);
1248
1249         channel_send_open(c->self);
1250         if (!no_shell_flag)
1251                 channel_register_open_confirm(c->self,
1252                     ssh_session2_setup, NULL);
1253
1254         return c->self;
1255 }
1256
1257 static int
1258 ssh_session2(void)
1259 {
1260         int id = -1;
1261
1262         /* XXX should be pre-session */
1263         ssh_init_forwarding();
1264
1265         if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN))
1266                 id = ssh_session2_open();
1267
1268         /* If we don't expect to open a new session, then disallow it */
1269         if (options.control_master == SSHCTL_MASTER_NO &&
1270             (datafellows & SSH_NEW_OPENSSH)) {
1271                 debug("Requesting no-more-sessions@openssh.com");
1272                 packet_start(SSH2_MSG_GLOBAL_REQUEST);
1273                 packet_put_cstring("no-more-sessions@openssh.com");
1274                 packet_put_char(0);
1275                 packet_send();
1276         }
1277
1278         /* Execute a local command */
1279         if (options.local_command != NULL &&
1280             options.permit_local_command)
1281                 ssh_local_cmd(options.local_command);
1282
1283         /* Start listening for multiplex clients */
1284         muxserver_listen();
1285
1286         /* If requested, let ssh continue in the background. */
1287         if (fork_after_authentication_flag) {
1288                 fork_after_authentication_flag = 0;
1289                 if (daemon(1, 1) < 0)
1290                         fatal("daemon() failed: %.200s", strerror(errno));
1291         }
1292
1293         if (options.use_roaming)
1294                 request_roaming();
1295
1296         return client_loop(tty_flag, tty_flag ?
1297             options.escape_char : SSH_ESCAPECHAR_NONE, id);
1298 }
1299
1300 static void
1301 load_public_identity_files(void)
1302 {
1303         char *filename, *cp, thishost[NI_MAXHOST];
1304         char *pwdir = NULL, *pwname = NULL;
1305         int i = 0;
1306         Key *public;
1307         struct passwd *pw;
1308 #ifdef SMARTCARD
1309         Key **keys;
1310
1311         if (options.smartcard_device != NULL &&
1312             options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
1313             (keys = sc_get_keys(options.smartcard_device, NULL)) != NULL) {
1314                 int count = 0;
1315                 for (i = 0; keys[i] != NULL; i++) {
1316                         count++;
1317                         memmove(&options.identity_files[1],
1318                             &options.identity_files[0],
1319                             sizeof(char *) * (SSH_MAX_IDENTITY_FILES - 1));
1320                         memmove(&options.identity_keys[1],
1321                             &options.identity_keys[0],
1322                             sizeof(Key *) * (SSH_MAX_IDENTITY_FILES - 1));
1323                         options.num_identity_files++;
1324                         options.identity_keys[0] = keys[i];
1325                         options.identity_files[0] = sc_get_key_label(keys[i]);
1326                 }
1327                 if (options.num_identity_files > SSH_MAX_IDENTITY_FILES)
1328                         options.num_identity_files = SSH_MAX_IDENTITY_FILES;
1329                 i = count;
1330                 xfree(keys);
1331         }
1332 #endif /* SMARTCARD */
1333         if ((pw = getpwuid(original_real_uid)) == NULL)
1334                 fatal("load_public_identity_files: getpwuid failed");
1335         pwname = xstrdup(pw->pw_name);
1336         pwdir = xstrdup(pw->pw_dir);
1337         if (gethostname(thishost, sizeof(thishost)) == -1)
1338                 fatal("load_public_identity_files: gethostname: %s",
1339                     strerror(errno));
1340         for (; i < options.num_identity_files; i++) {
1341                 cp = tilde_expand_filename(options.identity_files[i],
1342                     original_real_uid);
1343                 filename = percent_expand(cp, "d", pwdir,
1344                     "u", pwname, "l", thishost, "h", host,
1345                     "r", options.user, (char *)NULL);
1346                 xfree(cp);
1347                 public = key_load_public(filename, NULL);
1348                 debug("identity file %s type %d", filename,
1349                     public ? public->type : -1);
1350                 xfree(options.identity_files[i]);
1351                 options.identity_files[i] = filename;
1352                 options.identity_keys[i] = public;
1353         }
1354         bzero(pwname, strlen(pwname));
1355         xfree(pwname);
1356         bzero(pwdir, strlen(pwdir));
1357         xfree(pwdir);
1358 }