ssh.c

   1 /* $OpenBSD: ssh.c,v 1.331 2010/01/11 01:39:46 dtucker Exp $ */
   2 /*
   3  * Author: Tatu Ylonen <ylo@cs.hut.fi>
   4  * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
   5  *                    All rights reserved
   6  * Ssh client program.  This program can be used to log into a remote machine.
   7  * The software supports strong authentication, encryption, and forwarding
   8  * of X11, TCP/IP, and authentication connections.
   9  *
  10  * As far as I am concerned, the code I have written for this software
  11  * can be used freely for any purpose.  Any derived versions of this
  12  * software must be clearly marked as such, and if the derived work is
  13  * incompatible with the protocol description in the RFC file, it must be
  14  * called by a name other than "ssh" or "Secure Shell".
  15  *
  16  * Copyright (c) 1999 Niels Provos.  All rights reserved.
  17  * Copyright (c) 2000, 2001, 2002, 2003 Markus Friedl.  All rights reserved.
  18  *
  19  * Modified to work with SSL by Niels Provos <provos@citi.umich.edu>
  20  * in Canada (German citizen).
  21  *
  22  * Redistribution and use in source and binary forms, with or without
  23  * modification, are permitted provided that the following conditions
  24  * are met:
  25  * 1. Redistributions of source code must retain the above copyright
  26  *    notice, this list of conditions and the following disclaimer.
  27  * 2. Redistributions in binary form must reproduce the above copyright
  28  *    notice, this list of conditions and the following disclaimer in the
  29  *    documentation and/or other materials provided with the distribution.
  30  *
  31  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  32  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  33  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  34  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  35  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  36  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  37  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  38  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  39  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  40  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  41  */
  42
  43 #include "includes.h"
  44
  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 (strcmp(optarg, "check") == 0)
 323                                 muxclient_command = SSHMUX_COMMAND_ALIVE_CHECK;
 324                         else if (strcmp(optarg, "exit") == 0)
 325                                 muxclient_command = SSHMUX_COMMAND_TERMINATE;
 326                         else
 327                                 fatal("Invalid multiplex command.");
 328                         break;
 329                 case 'P':       /* deprecated */
 330                         options.use_privileged_port = 0;
 331                         break;
 332                 case 'a':
 333                         options.forward_agent = 0;
 334                         break;
 335                 case 'A':
 336                         options.forward_agent = 1;
 337                         break;
 338                 case 'k':
 339                         options.gss_deleg_creds = 0;
 340                         break;
 341                 case 'K':
 342                         options.gss_authentication = 1;
 343                         options.gss_deleg_creds = 1;
 344                         break;
 345                 case 'i':
 346                         if (stat(optarg, &st) < 0) {
 347                                 fprintf(stderr, "Warning: Identity file %s "
 348                                     "not accessible: %s.\n", optarg,
 349                                     strerror(errno));
 350                                 break;
 351                         }
 352                         if (options.num_identity_files >=
 353                             SSH_MAX_IDENTITY_FILES)
 354                                 fatal("Too many identity files specified "
 355                                     "(max %d)", SSH_MAX_IDENTITY_FILES);
 356                         options.identity_files[options.num_identity_files++] =
 357                             xstrdup(optarg);
 358                         break;
 359                 case 'I':
 360 #ifdef SMARTCARD
 361                         options.smartcard_device = xstrdup(optarg);
 362 #else
 363                         fprintf(stderr, "no support for smartcards.\n");
 364 #endif
 365                         break;
 366                 case 't':
 367                         if (tty_flag)
 368                                 force_tty_flag = 1;
 369                         tty_flag = 1;
 370                         break;
 371                 case 'v':
 372                         if (debug_flag == 0) {
 373                                 debug_flag = 1;
 374                                 options.log_level = SYSLOG_LEVEL_DEBUG1;
 375                         } else {
 376                                 if (options.log_level < SYSLOG_LEVEL_DEBUG3)
 377                                         options.log_level++;
 378                                 break;
 379                         }
 380                         /* FALLTHROUGH */
 381                 case 'V':
 382                         fprintf(stderr, "%s, %s\n",
 383                             SSH_RELEASE, SSLeay_version(SSLEAY_VERSION));
 384                         if (opt == 'V')
 385                                 exit(0);
 386                         break;
 387                 case 'w':
 388                         if (options.tun_open == -1)
 389                                 options.tun_open = SSH_TUNMODE_DEFAULT;
 390                         options.tun_local = a2tun(optarg, &options.tun_remote);
 391                         if (options.tun_local == SSH_TUNID_ERR) {
 392                                 fprintf(stderr,
 393                                     "Bad tun device '%s'\n", optarg);
 394                                 exit(255);
 395                         }
 396                         break;
 397                 case 'W':
 398                         if (parse_forward(&fwd, optarg, 1, 0)) {
 399                                 stdio_forward_host = fwd.listen_host;
 400                                 stdio_forward_port = fwd.listen_port;
 401                                 xfree(fwd.connect_host);
 402                         } else {
 403                                 fprintf(stderr,
 404                                     "Bad stdio forwarding specification '%s'\n",
 405                                     optarg);
 406                                 exit(255);
 407                         }
 408                         no_tty_flag = 1;
 409                         no_shell_flag = 1;
 410                         options.clear_forwardings = 1;
 411                         options.exit_on_forward_failure = 1;
 412                         break;
 413                 case 'q':
 414                         options.log_level = SYSLOG_LEVEL_QUIET;
 415                         break;
 416                 case 'e':
 417                         if (optarg[0] == '^' && optarg[2] == 0 &&
 418                             (u_char) optarg[1] >= 64 &&
 419                             (u_char) optarg[1] < 128)
 420                                 options.escape_char = (u_char) optarg[1] & 31;
 421                         else if (strlen(optarg) == 1)
 422                                 options.escape_char = (u_char) optarg[0];
 423                         else if (strcmp(optarg, "none") == 0)
 424                                 options.escape_char = SSH_ESCAPECHAR_NONE;
 425                         else {
 426                                 fprintf(stderr, "Bad escape character '%s'.\n",
 427                                     optarg);
 428                                 exit(255);
 429                         }
 430                         break;
 431                 case 'c':
 432                         if (ciphers_valid(optarg)) {
 433                                 /* SSH2 only */
 434                                 options.ciphers = xstrdup(optarg);
 435                                 options.cipher = SSH_CIPHER_INVALID;
 436                         } else {
 437                                 /* SSH1 only */
 438                                 options.cipher = cipher_number(optarg);
 439                                 if (options.cipher == -1) {
 440                                         fprintf(stderr,
 441                                             "Unknown cipher type '%s'\n",
 442                                             optarg);
 443                                         exit(255);
 444                                 }
 445                                 if (options.cipher == SSH_CIPHER_3DES)
 446                                         options.ciphers = "3des-cbc";
 447                                 else if (options.cipher == SSH_CIPHER_BLOWFISH)
 448                                         options.ciphers = "blowfish-cbc";
 449                                 else
 450                                         options.ciphers = (char *)-1;
 451                         }
 452                         break;
 453                 case 'm':
 454                         if (mac_valid(optarg))
 455                                 options.macs = xstrdup(optarg);
 456                         else {
 457                                 fprintf(stderr, "Unknown mac type '%s'\n",
 458                                     optarg);
 459                                 exit(255);
 460                         }
 461                         break;
 462                 case 'M':
 463                         if (options.control_master == SSHCTL_MASTER_YES)
 464                                 options.control_master = SSHCTL_MASTER_ASK;
 465                         else
 466                                 options.control_master = SSHCTL_MASTER_YES;
 467                         break;
 468                 case 'p':
 469                         options.port = a2port(optarg);
 470                         if (options.port <= 0) {
 471                                 fprintf(stderr, "Bad port '%s'\n", optarg);
 472                                 exit(255);
 473                         }
 474                         break;
 475                 case 'l':
 476                         options.user = optarg;
 477                         break;
 478
 479                 case 'L':
 480                         if (parse_forward(&fwd, optarg, 0, 0))
 481                                 add_local_forward(&options, &fwd);
 482                         else {
 483                                 fprintf(stderr,
 484                                     "Bad local forwarding specification '%s'\n",
 485                                     optarg);
 486                                 exit(255);
 487                         }
 488                         break;
 489
 490                 case 'R':
 491                         if (parse_forward(&fwd, optarg, 0, 1)) {
 492                                 add_remote_forward(&options, &fwd);
 493                         } else {
 494                                 fprintf(stderr,
 495                                     "Bad remote forwarding specification "
 496                                     "'%s'\n", optarg);
 497                                 exit(255);
 498                         }
 499                         break;
 500
 501                 case 'D':
 502                         if (parse_forward(&fwd, optarg, 1, 0)) {
 503                                 add_local_forward(&options, &fwd);
 504                         } else {
 505                                 fprintf(stderr,
 506                                     "Bad dynamic forwarding specification "
 507                                     "'%s'\n", optarg);
 508                                 exit(255);
 509                         }
 510                         break;
 511
 512                 case 'C':
 513                         options.compression = 1;
 514                         break;
 515                 case 'N':
 516                         no_shell_flag = 1;
 517                         no_tty_flag = 1;
 518                         break;
 519                 case 'T':
 520                         no_tty_flag = 1;
 521                         break;
 522                 case 'o':
 523                         dummy = 1;
 524                         line = xstrdup(optarg);
 525                         if (process_config_line(&options, host ? host : "",
 526                             line, "command-line", 0, &dummy) != 0)
 527                                 exit(255);
 528                         xfree(line);
 529                         break;
 530                 case 's':
 531                         subsystem_flag = 1;
 532                         break;
 533                 case 'S':
 534                         if (options.control_path != NULL)
 535                                 free(options.control_path);
 536                         options.control_path = xstrdup(optarg);
 537                         break;
 538                 case 'b':
 539                         options.bind_address = optarg;
 540                         break;
 541                 case 'F':
 542                         config = optarg;
 543                         break;
 544                 default:
 545                         usage();
 546                 }
 547         }
 548
 549         ac -= optind;
 550         av += optind;
 551
 552         if (ac > 0 && !host) {
 553                 if (strrchr(*av, '@')) {
 554                         p = xstrdup(*av);
 555                         cp = strrchr(p, '@');
 556                         if (cp == NULL || cp == p)
 557                                 usage();
 558                         options.user = p;
 559                         *cp = '\0';
 560                         host = ++cp;
 561                 } else
 562                         host = *av;
 563                 if (ac > 1) {
 564                         optind = optreset = 1;
 565                         goto again;
 566                 }
 567                 ac--, av++;
 568         }
 569
 570         /* Check that we got a host name. */
 571         if (!host)
 572                 usage();
 573
 574         SSLeay_add_all_algorithms();
 575         ERR_load_crypto_strings();
 576
 577         /* Initialize the command to execute on remote host. */
 578         buffer_init(&command);
 579
 580         /*
 581          * Save the command to execute on the remote host in a buffer. There
 582          * is no limit on the length of the command, except by the maximum
 583          * packet size.  Also sets the tty flag if there is no command.
 584          */
 585         if (!ac) {
 586                 /* No command specified - execute shell on a tty. */
 587                 tty_flag = 1;
 588                 if (subsystem_flag) {
 589                         fprintf(stderr,
 590                             "You must specify a subsystem to invoke.\n");
 591                         usage();
 592                 }
 593         } else {
 594                 /* A command has been specified.  Store it into the buffer. */
 595                 for (i = 0; i < ac; i++) {
 596                         if (i)
 597                                 buffer_append(&command, " ", 1);
 598                         buffer_append(&command, av[i], strlen(av[i]));
 599                 }
 600         }
 601
 602         /* Cannot fork to background if no command. */
 603         if (fork_after_authentication_flag && buffer_len(&command) == 0 &&
 604             !no_shell_flag)
 605                 fatal("Cannot fork into background without a command "
 606                     "to execute.");
 607
 608         /* Allocate a tty by default if no command specified. */
 609         if (buffer_len(&command) == 0)
 610                 tty_flag = 1;
 611
 612         /* Force no tty */
 613         if (no_tty_flag)
 614                 tty_flag = 0;
 615         /* Do not allocate a tty if stdin is not a tty. */
 616         if ((!isatty(fileno(stdin)) || stdin_null_flag) && !force_tty_flag) {
 617                 if (tty_flag)
 618                         logit("Pseudo-terminal will not be allocated because "
 619                             "stdin is not a terminal.");
 620                 tty_flag = 0;
 621         }
 622
 623         /*
 624          * Initialize "log" output.  Since we are the client all output
 625          * actually goes to stderr.
 626          */
 627         log_init(argv0,
 628             options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level,
 629             SYSLOG_FACILITY_USER, !use_syslog);
 630
 631         /*
 632          * Read per-user configuration file.  Ignore the system wide config
 633          * file if the user specifies a config file on the command line.
 634          */
 635         if (config != NULL) {
 636                 if (!read_config_file(config, host, &options, 0))
 637                         fatal("Can't open user config file %.100s: "
 638                             "%.100s", config, strerror(errno));
 639         } else {
 640                 r = snprintf(buf, sizeof buf, "%s/%s", pw->pw_dir,
 641                     _PATH_SSH_USER_CONFFILE);
 642                 if (r > 0 && (size_t)r < sizeof(buf))
 643                         (void)read_config_file(buf, host, &options, 1);
 644
 645                 /* Read systemwide configuration file after use config. */
 646                 (void)read_config_file(_PATH_HOST_CONFIG_FILE, host,
 647                     &options, 0);
 648         }
 649
 650         /* Fill configuration defaults. */
 651         fill_default_options(&options);
 652
 653         channel_set_af(options.address_family);
 654
 655         /* reinit */
 656         log_init(argv0, options.log_level, SYSLOG_FACILITY_USER, !use_syslog);
 657
 658         seed_rng();
 659
 660         if (options.user == NULL)
 661                 options.user = xstrdup(pw->pw_name);
 662
 663         /* Get default port if port has not been set. */
 664         if (options.port == 0) {
 665                 sp = getservbyname(SSH_SERVICE_NAME, "tcp");
 666                 options.port = sp ? ntohs(sp->s_port) : SSH_DEFAULT_PORT;
 667         }
 668
 669         if (options.local_command != NULL) {
 670                 char thishost[NI_MAXHOST];
 671
 672                 if (gethostname(thishost, sizeof(thishost)) == -1)
 673                         fatal("gethostname: %s", strerror(errno));
 674                 snprintf(buf, sizeof(buf), "%d", options.port);
 675                 debug3("expanding LocalCommand: %s", options.local_command);
 676                 cp = options.local_command;
 677                 options.local_command = percent_expand(cp, "d", pw->pw_dir,
 678                     "h", options.hostname? options.hostname : host,
 679                     "l", thishost, "n", host, "r", options.user, "p", buf,
 680                     "u", pw->pw_name, (char *)NULL);
 681                 debug3("expanded LocalCommand: %s", options.local_command);
 682                 xfree(cp);
 683         }
 684
 685         if (options.hostname != NULL)
 686                 host = options.hostname;
 687
 688         /* force lowercase for hostkey matching */
 689         if (options.host_key_alias != NULL) {
 690                 for (p = options.host_key_alias; *p; p++)
 691                         if (isupper(*p))
 692                                 *p = (char)tolower(*p);
 693         }
 694
 695         if (options.proxy_command != NULL &&
 696             strcmp(options.proxy_command, "none") == 0) {
 697                 xfree(options.proxy_command);
 698                 options.proxy_command = NULL;
 699         }
 700         if (options.control_path != NULL &&
 701             strcmp(options.control_path, "none") == 0) {
 702                 xfree(options.control_path);
 703                 options.control_path = NULL;
 704         }
 705
 706         if (options.control_path != NULL) {
 707                 char thishost[NI_MAXHOST];
 708
 709                 if (gethostname(thishost, sizeof(thishost)) == -1)
 710                         fatal("gethostname: %s", strerror(errno));
 711                 snprintf(buf, sizeof(buf), "%d", options.port);
 712                 cp = tilde_expand_filename(options.control_path,
 713                     original_real_uid);
 714                 xfree(options.control_path);
 715                 options.control_path = percent_expand(cp, "p", buf, "h", host,
 716                     "r", options.user, "l", thishost, (char *)NULL);
 717                 xfree(cp);
 718         }
 719         if (muxclient_command != 0 && options.control_path == NULL)
 720                 fatal("No ControlPath specified for \"-O\" command");
 721         if (options.control_path != NULL)
 722                 muxclient(options.control_path);
 723
 724         timeout_ms = options.connection_timeout * 1000;
 725
 726         /* Open a connection to the remote host. */
 727         if (ssh_connect(host, &hostaddr, options.port,
 728             options.address_family, options.connection_attempts, &timeout_ms,
 729             options.tcp_keep_alive,
 730 #ifdef HAVE_CYGWIN
 731             options.use_privileged_port,
 732 #else
 733             original_effective_uid == 0 && options.use_privileged_port,
 734 #endif
 735             options.proxy_command) != 0)
 736                 exit(255);
 737
 738         if (timeout_ms > 0)
 739                 debug3("timeout: %d ms remain after connect", timeout_ms);
 740
 741         /*
 742          * If we successfully made the connection, load the host private key
 743          * in case we will need it later for combined rsa-rhosts
 744          * authentication. This must be done before releasing extra
 745          * privileges, because the file is only readable by root.
 746          * If we cannot access the private keys, load the public keys
 747          * instead and try to execute the ssh-keysign helper instead.
 748          */
 749         sensitive_data.nkeys = 0;
 750         sensitive_data.keys = NULL;
 751         sensitive_data.external_keysign = 0;
 752         if (options.rhosts_rsa_authentication ||
 753             options.hostbased_authentication) {
 754                 sensitive_data.nkeys = 3;
 755                 sensitive_data.keys = xcalloc(sensitive_data.nkeys,
 756                     sizeof(Key));
 757
 758                 PRIV_START;
 759                 sensitive_data.keys[0] = key_load_private_type(KEY_RSA1,
 760                     _PATH_HOST_KEY_FILE, "", NULL, NULL);
 761                 sensitive_data.keys[1] = key_load_private_type(KEY_DSA,
 762                     _PATH_HOST_DSA_KEY_FILE, "", NULL, NULL);
 763                 sensitive_data.keys[2] = key_load_private_type(KEY_RSA,
 764                     _PATH_HOST_RSA_KEY_FILE, "", NULL, NULL);
 765                 PRIV_END;
 766
 767                 if (options.hostbased_authentication == 1 &&
 768                     sensitive_data.keys[0] == NULL &&
 769                     sensitive_data.keys[1] == NULL &&
 770                     sensitive_data.keys[2] == NULL) {
 771                         sensitive_data.keys[1] = key_load_public(
 772                             _PATH_HOST_DSA_KEY_FILE, NULL);
 773                         sensitive_data.keys[2] = key_load_public(
 774                             _PATH_HOST_RSA_KEY_FILE, NULL);
 775                         sensitive_data.external_keysign = 1;
 776                 }
 777         }
 778         /*
 779          * Get rid of any extra privileges that we may have.  We will no
 780          * longer need them.  Also, extra privileges could make it very hard
 781          * to read identity files and other non-world-readable files from the
 782          * user's home directory if it happens to be on a NFS volume where
 783          * root is mapped to nobody.
 784          */
 785         if (original_effective_uid == 0) {
 786                 PRIV_START;
 787                 permanently_set_uid(pw);
 788         }
 789
 790         /*
 791          * Now that we are back to our own permissions, create ~/.ssh
 792          * directory if it doesn't already exist.
 793          */
 794         r = snprintf(buf, sizeof buf, "%s%s%s", pw->pw_dir,
 795             strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR);
 796         if (r > 0 && (size_t)r < sizeof(buf) && stat(buf, &st) < 0)
 797                 if (mkdir(buf, 0700) < 0)
 798                         error("Could not create directory '%.200s'.", buf);
 799
 800         /* load options.identity_files */
 801         load_public_identity_files();
 802
 803         /* Expand ~ in known host file names. */
 804         /* XXX mem-leaks: */
 805         options.system_hostfile =
 806             tilde_expand_filename(options.system_hostfile, original_real_uid);
 807         options.user_hostfile =
 808             tilde_expand_filename(options.user_hostfile, original_real_uid);
 809         options.system_hostfile2 =
 810             tilde_expand_filename(options.system_hostfile2, original_real_uid);
 811         options.user_hostfile2 =
 812             tilde_expand_filename(options.user_hostfile2, original_real_uid);
 813
 814         signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
 815
 816         /* Log into the remote system.  Never returns if the login fails. */
 817         ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr,
 818             pw, timeout_ms);
 819
 820         /* We no longer need the private host keys.  Clear them now. */
 821         if (sensitive_data.nkeys != 0) {
 822                 for (i = 0; i < sensitive_data.nkeys; i++) {
 823                         if (sensitive_data.keys[i] != NULL) {
 824                                 /* Destroys contents safely */
 825                                 debug3("clear hostkey %d", i);
 826                                 key_free(sensitive_data.keys[i]);
 827                                 sensitive_data.keys[i] = NULL;
 828                         }
 829                 }
 830                 xfree(sensitive_data.keys);
 831         }
 832         for (i = 0; i < options.num_identity_files; i++) {
 833                 if (options.identity_files[i]) {
 834                         xfree(options.identity_files[i]);
 835                         options.identity_files[i] = NULL;
 836                 }
 837                 if (options.identity_keys[i]) {
 838                         key_free(options.identity_keys[i]);
 839                         options.identity_keys[i] = NULL;
 840                 }
 841         }
 842
 843         exit_status = compat20 ? ssh_session2() : ssh_session();
 844         packet_close();
 845
 846         if (options.control_path != NULL && muxserver_sock != -1)
 847                 unlink(options.control_path);
 848
 849         /*
 850          * Send SIGHUP to proxy command if used. We don't wait() in
 851          * case it hangs and instead rely on init to reap the child
 852          */
 853         if (proxy_command_pid > 1)
 854                 kill(proxy_command_pid, SIGHUP);
 855
 856         return exit_status;
 857 }
 858
 859 /* Callback for remote forward global requests */
 860 static void
 861 ssh_confirm_remote_forward(int type, u_int32_t seq, void *ctxt)
 862 {
 863         Forward *rfwd = (Forward *)ctxt;
 864
 865         /* XXX verbose() on failure? */
 866         debug("remote forward %s for: listen %d, connect %s:%d",
 867             type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
 868             rfwd->listen_port, rfwd->connect_host, rfwd->connect_port);
 869         if (type == SSH2_MSG_REQUEST_SUCCESS && rfwd->listen_port == 0) {
 870                 logit("Allocated port %u for remote forward to %s:%d",
 871                         packet_get_int(),
 872                         rfwd->connect_host, rfwd->connect_port);
 873         }
 874
 875         if (type == SSH2_MSG_REQUEST_FAILURE) {
 876                 if (options.exit_on_forward_failure)
 877                         fatal("Error: remote port forwarding failed for "
 878                             "listen port %d", rfwd->listen_port);
 879                 else
 880                         logit("Warning: remote port forwarding failed for "
 881                             "listen port %d", rfwd->listen_port);
 882         }
 883         if (++remote_forward_confirms_received == options.num_remote_forwards) {
 884                 debug("All remote forwarding requests processed");
 885                 if (fork_after_authentication_flag) {
 886                         fork_after_authentication_flag = 0;
 887                         if (daemon(1, 1) < 0)
 888                                 fatal("daemon() failed: %.200s",
 889                                     strerror(errno));
 890                 }
 891         }
 892 }
 893
 894 static void
 895 client_cleanup_stdio_fwd(int id, void *arg)
 896 {
 897         debug("stdio forwarding: done");
 898         cleanup_exit(0);
 899 }
 900
 901 static int
 902 client_setup_stdio_fwd(const char *host_to_connect, u_short port_to_connect)
 903 {
 904         Channel *c;
 905
 906         debug3("client_setup_stdio_fwd %s:%d", host_to_connect,
 907             port_to_connect);
 908         if ((c = channel_connect_stdio_fwd(host_to_connect, port_to_connect))
 909             == NULL)
 910                 return 0;
 911         channel_register_cleanup(c->self, client_cleanup_stdio_fwd, 0);
 912         return 1;
 913 }
 914
 915 static void
 916 ssh_init_forwarding(void)
 917 {
 918         int success = 0;
 919         int i;
 920
 921         if (stdio_forward_host != NULL) {
 922                 if (!compat20) {
 923                         fatal("stdio forwarding require Protocol 2");
 924                 }
 925                 if (!client_setup_stdio_fwd(stdio_forward_host,
 926                     stdio_forward_port))
 927                         fatal("Failed to connect in stdio forward mode.");
 928         }
 929
 930         /* Initiate local TCP/IP port forwardings. */
 931         for (i = 0; i < options.num_local_forwards; i++) {
 932                 debug("Local connections to %.200s:%d forwarded to remote "
 933                     "address %.200s:%d",
 934                     (options.local_forwards[i].listen_host == NULL) ?
 935                     (options.gateway_ports ? "*" : "LOCALHOST") :
 936                     options.local_forwards[i].listen_host,
 937                     options.local_forwards[i].listen_port,
 938                     options.local_forwards[i].connect_host,
 939                     options.local_forwards[i].connect_port);
 940                 success += channel_setup_local_fwd_listener(
 941                     options.local_forwards[i].listen_host,
 942                     options.local_forwards[i].listen_port,
 943                     options.local_forwards[i].connect_host,
 944                     options.local_forwards[i].connect_port,
 945                     options.gateway_ports);
 946         }
 947         if (i > 0 && success != i && options.exit_on_forward_failure)
 948                 fatal("Could not request local forwarding.");
 949         if (i > 0 && success == 0)
 950                 error("Could not request local forwarding.");
 951
 952         /* Initiate remote TCP/IP port forwardings. */
 953         for (i = 0; i < options.num_remote_forwards; i++) {
 954                 debug("Remote connections from %.200s:%d forwarded to "
 955                     "local address %.200s:%d",
 956                     (options.remote_forwards[i].listen_host == NULL) ?
 957                     "LOCALHOST" : options.remote_forwards[i].listen_host,
 958                     options.remote_forwards[i].listen_port,
 959                     options.remote_forwards[i].connect_host,
 960                     options.remote_forwards[i].connect_port);
 961                 if (channel_request_remote_forwarding(
 962                     options.remote_forwards[i].listen_host,
 963                     options.remote_forwards[i].listen_port,
 964                     options.remote_forwards[i].connect_host,
 965                     options.remote_forwards[i].connect_port) < 0) {
 966                         if (options.exit_on_forward_failure)
 967                                 fatal("Could not request remote forwarding.");
 968                         else
 969                                 logit("Warning: Could not request remote "
 970                                     "forwarding.");
 971                 }
 972                 client_register_global_confirm(ssh_confirm_remote_forward,
 973                     &options.remote_forwards[i]);
 974         }
 975
 976         /* Initiate tunnel forwarding. */
 977         if (options.tun_open != SSH_TUNMODE_NO) {
 978                 if (client_request_tun_fwd(options.tun_open,
 979                     options.tun_local, options.tun_remote) == -1) {
 980                         if (options.exit_on_forward_failure)
 981                                 fatal("Could not request tunnel forwarding.");
 982                         else
 983                                 error("Could not request tunnel forwarding.");
 984                 }
 985         }
 986 }
 987
 988 static void
 989 check_agent_present(void)
 990 {
 991         if (options.forward_agent) {
 992                 /* Clear agent forwarding if we don't have an agent. */
 993                 if (!ssh_agent_present())
 994                         options.forward_agent = 0;
 995         }
 996 }
 997
 998 static int
 999 ssh_session(void)
1000 {
1001         int type;
1002         int interactive = 0;
1003         int have_tty = 0;
1004         struct winsize ws;
1005         char *cp;
1006         const char *display;
1007
1008         /* Enable compression if requested. */
1009         if (options.compression) {
1010                 debug("Requesting compression at level %d.",
1011                     options.compression_level);
1012
1013                 if (options.compression_level < 1 ||
1014                     options.compression_level > 9)
1015                         fatal("Compression level must be from 1 (fast) to "
1016                             "9 (slow, best).");
1017
1018                 /* Send the request. */
1019                 packet_start(SSH_CMSG_REQUEST_COMPRESSION);
1020                 packet_put_int(options.compression_level);
1021                 packet_send();
1022                 packet_write_wait();
1023                 type = packet_read();
1024                 if (type == SSH_SMSG_SUCCESS)
1025                         packet_start_compression(options.compression_level);
1026                 else if (type == SSH_SMSG_FAILURE)
1027                         logit("Warning: Remote host refused compression.");
1028                 else
1029                         packet_disconnect("Protocol error waiting for "
1030                             "compression response.");
1031         }
1032         /* Allocate a pseudo tty if appropriate. */
1033         if (tty_flag) {
1034                 debug("Requesting pty.");
1035
1036                 /* Start the packet. */
1037                 packet_start(SSH_CMSG_REQUEST_PTY);
1038
1039                 /* Store TERM in the packet.  There is no limit on the
1040                    length of the string. */
1041                 cp = getenv("TERM");
1042                 if (!cp)
1043                         cp = "";
1044                 packet_put_cstring(cp);
1045
1046                 /* Store window size in the packet. */
1047                 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
1048                         memset(&ws, 0, sizeof(ws));
1049                 packet_put_int((u_int)ws.ws_row);
1050                 packet_put_int((u_int)ws.ws_col);
1051                 packet_put_int((u_int)ws.ws_xpixel);
1052                 packet_put_int((u_int)ws.ws_ypixel);
1053
1054                 /* Store tty modes in the packet. */
1055                 tty_make_modes(fileno(stdin), NULL);
1056
1057                 /* Send the packet, and wait for it to leave. */
1058                 packet_send();
1059                 packet_write_wait();
1060
1061                 /* Read response from the server. */
1062                 type = packet_read();
1063                 if (type == SSH_SMSG_SUCCESS) {
1064                         interactive = 1;
1065                         have_tty = 1;
1066                 } else if (type == SSH_SMSG_FAILURE)
1067                         logit("Warning: Remote host failed or refused to "
1068                             "allocate a pseudo tty.");
1069                 else
1070                         packet_disconnect("Protocol error waiting for pty "
1071                             "request response.");
1072         }
1073         /* Request X11 forwarding if enabled and DISPLAY is set. */
1074         display = getenv("DISPLAY");
1075         if (options.forward_x11 && display != NULL) {
1076                 char *proto, *data;
1077                 /* Get reasonable local authentication information. */
1078                 client_x11_get_proto(display, options.xauth_location,
1079                     options.forward_x11_trusted, &proto, &data);
1080                 /* Request forwarding with authentication spoofing. */
1081                 debug("Requesting X11 forwarding with authentication "
1082                     "spoofing.");
1083                 x11_request_forwarding_with_spoofing(0, display, proto, data);
1084
1085                 /* Read response from the server. */
1086                 type = packet_read();
1087                 if (type == SSH_SMSG_SUCCESS) {
1088                         interactive = 1;
1089                 } else if (type == SSH_SMSG_FAILURE) {
1090                         logit("Warning: Remote host denied X11 forwarding.");
1091                 } else {
1092                         packet_disconnect("Protocol error waiting for X11 "
1093                             "forwarding");
1094                 }
1095         }
1096         /* Tell the packet module whether this is an interactive session. */
1097         packet_set_interactive(interactive);
1098
1099         /* Request authentication agent forwarding if appropriate. */
1100         check_agent_present();
1101
1102         if (options.forward_agent) {
1103                 debug("Requesting authentication agent forwarding.");
1104                 auth_request_forwarding();
1105
1106                 /* Read response from the server. */
1107                 type = packet_read();
1108                 packet_check_eom();
1109                 if (type != SSH_SMSG_SUCCESS)
1110                         logit("Warning: Remote host denied authentication agent forwarding.");
1111         }
1112
1113         /* Initiate port forwardings. */
1114         ssh_init_forwarding();
1115
1116         /* Execute a local command */
1117         if (options.local_command != NULL &&
1118             options.permit_local_command)
1119                 ssh_local_cmd(options.local_command);
1120
1121         /*
1122          * If requested and we are not interested in replies to remote
1123          * forwarding requests, then let ssh continue in the background.
1124          */
1125         if (fork_after_authentication_flag &&
1126             (!options.exit_on_forward_failure ||
1127             options.num_remote_forwards == 0)) {
1128                 fork_after_authentication_flag = 0;
1129                 if (daemon(1, 1) < 0)
1130                         fatal("daemon() failed: %.200s", strerror(errno));
1131         }
1132
1133         /*
1134          * If a command was specified on the command line, execute the
1135          * command now. Otherwise request the server to start a shell.
1136          */
1137         if (buffer_len(&command) > 0) {
1138                 int len = buffer_len(&command);
1139                 if (len > 900)
1140                         len = 900;
1141                 debug("Sending command: %.*s", len,
1142                     (u_char *)buffer_ptr(&command));
1143                 packet_start(SSH_CMSG_EXEC_CMD);
1144                 packet_put_string(buffer_ptr(&command), buffer_len(&command));
1145                 packet_send();
1146                 packet_write_wait();
1147         } else {
1148                 debug("Requesting shell.");
1149                 packet_start(SSH_CMSG_EXEC_SHELL);
1150                 packet_send();
1151                 packet_write_wait();
1152         }
1153
1154         /* Enter the interactive session. */
1155         return client_loop(have_tty, tty_flag ?
1156             options.escape_char : SSH_ESCAPECHAR_NONE, 0);
1157 }
1158
1159 /* request pty/x11/agent/tcpfwd/shell for channel */
1160 static void
1161 ssh_session2_setup(int id, void *arg)
1162 {
1163         extern char **environ;
1164         const char *display;
1165         int interactive = tty_flag;
1166
1167         display = getenv("DISPLAY");
1168         if (options.forward_x11 && display != NULL) {
1169                 char *proto, *data;
1170                 /* Get reasonable local authentication information. */
1171                 client_x11_get_proto(display, options.xauth_location,
1172                     options.forward_x11_trusted, &proto, &data);
1173                 /* Request forwarding with authentication spoofing. */
1174                 debug("Requesting X11 forwarding with authentication "
1175                     "spoofing.");
1176                 x11_request_forwarding_with_spoofing(id, display, proto, data);
1177                 interactive = 1;
1178                 /* XXX wait for reply */
1179         }
1180
1181         check_agent_present();
1182         if (options.forward_agent) {
1183                 debug("Requesting authentication agent forwarding.");
1184                 channel_request_start(id, "auth-agent-req@openssh.com", 0);
1185                 packet_send();
1186         }
1187
1188         client_session2_setup(id, tty_flag, subsystem_flag, getenv("TERM"),
1189             NULL, fileno(stdin), &command, environ);
1190
1191         packet_set_interactive(interactive);
1192 }
1193
1194 /* open new channel for a session */
1195 static int
1196 ssh_session2_open(void)
1197 {
1198         Channel *c;
1199         int window, packetmax, in, out, err;
1200
1201         if (stdin_null_flag) {
1202                 in = open(_PATH_DEVNULL, O_RDONLY);
1203         } else {
1204                 in = dup(STDIN_FILENO);
1205         }
1206         out = dup(STDOUT_FILENO);
1207         err = dup(STDERR_FILENO);
1208
1209         if (in < 0 || out < 0 || err < 0)
1210                 fatal("dup() in/out/err failed");
1211
1212         /* enable nonblocking unless tty */
1213         if (!isatty(in))
1214                 set_nonblock(in);
1215         if (!isatty(out))
1216                 set_nonblock(out);
1217         if (!isatty(err))
1218                 set_nonblock(err);
1219
1220         window = CHAN_SES_WINDOW_DEFAULT;
1221         packetmax = CHAN_SES_PACKET_DEFAULT;
1222         if (tty_flag) {
1223                 window >>= 1;
1224                 packetmax >>= 1;
1225         }
1226         c = channel_new(
1227             "session", SSH_CHANNEL_OPENING, in, out, err,
1228             window, packetmax, CHAN_EXTENDED_WRITE,
1229             "client-session", /*nonblock*/0);
1230
1231         debug3("ssh_session2_open: channel_new: %d", c->self);
1232
1233         channel_send_open(c->self);
1234         if (!no_shell_flag)
1235                 channel_register_open_confirm(c->self,
1236                     ssh_session2_setup, NULL);
1237
1238         return c->self;
1239 }
1240
1241 static int
1242 ssh_session2(void)
1243 {
1244         int id = -1;
1245
1246         /* XXX should be pre-session */
1247         ssh_init_forwarding();
1248
1249         if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN))
1250                 id = ssh_session2_open();
1251
1252         /* If we don't expect to open a new session, then disallow it */
1253         if (options.control_master == SSHCTL_MASTER_NO &&
1254             (datafellows & SSH_NEW_OPENSSH)) {
1255                 debug("Requesting no-more-sessions@openssh.com");
1256                 packet_start(SSH2_MSG_GLOBAL_REQUEST);
1257                 packet_put_cstring("no-more-sessions@openssh.com");
1258                 packet_put_char(0);
1259                 packet_send();
1260         }
1261
1262         /* Execute a local command */
1263         if (options.local_command != NULL &&
1264             options.permit_local_command)
1265                 ssh_local_cmd(options.local_command);
1266
1267         /* Start listening for multiplex clients */
1268         muxserver_listen();
1269
1270         /* If requested, let ssh continue in the background. */
1271         if (fork_after_authentication_flag) {
1272                 fork_after_authentication_flag = 0;
1273                 if (daemon(1, 1) < 0)
1274                         fatal("daemon() failed: %.200s", strerror(errno));
1275         }
1276
1277         if (options.use_roaming)
1278                 request_roaming();
1279
1280         return client_loop(tty_flag, tty_flag ?
1281             options.escape_char : SSH_ESCAPECHAR_NONE, id);
1282 }
1283
1284 static void
1285 load_public_identity_files(void)
1286 {
1287         char *filename, *cp, thishost[NI_MAXHOST];
1288         char *pwdir = NULL, *pwname = NULL;
1289         int i = 0;
1290         Key *public;
1291         struct passwd *pw;
1292 #ifdef SMARTCARD
1293         Key **keys;
1294
1295         if (options.smartcard_device != NULL &&
1296             options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
1297             (keys = sc_get_keys(options.smartcard_device, NULL)) != NULL) {
1298                 int count = 0;
1299                 for (i = 0; keys[i] != NULL; i++) {
1300                         count++;
1301                         memmove(&options.identity_files[1],
1302                             &options.identity_files[0],
1303                             sizeof(char *) * (SSH_MAX_IDENTITY_FILES - 1));
1304                         memmove(&options.identity_keys[1],
1305                             &options.identity_keys[0],
1306                             sizeof(Key *) * (SSH_MAX_IDENTITY_FILES - 1));
1307                         options.num_identity_files++;
1308                         options.identity_keys[0] = keys[i];
1309                         options.identity_files[0] = sc_get_key_label(keys[i]);
1310                 }
1311                 if (options.num_identity_files > SSH_MAX_IDENTITY_FILES)
1312                         options.num_identity_files = SSH_MAX_IDENTITY_FILES;
1313                 i = count;
1314                 xfree(keys);
1315         }
1316 #endif /* SMARTCARD */
1317         if ((pw = getpwuid(original_real_uid)) == NULL)
1318                 fatal("load_public_identity_files: getpwuid failed");
1319         pwname = xstrdup(pw->pw_name);
1320         pwdir = xstrdup(pw->pw_dir);
1321         if (gethostname(thishost, sizeof(thishost)) == -1)
1322                 fatal("load_public_identity_files: gethostname: %s",
1323                     strerror(errno));
1324         for (; i < options.num_identity_files; i++) {
1325                 cp = tilde_expand_filename(options.identity_files[i],
1326                     original_real_uid);
1327                 filename = percent_expand(cp, "d", pwdir,
1328                     "u", pwname, "l", thishost, "h", host,
1329                     "r", options.user, (char *)NULL);
1330                 xfree(cp);
1331                 public = key_load_public(filename, NULL);
1332                 debug("identity file %s type %d", filename,
1333                     public ? public->type : -1);
1334                 xfree(options.identity_files[i]);
1335                 options.identity_files[i] = filename;
1336                 options.identity_keys[i] = public;
1337         }
1338         bzero(pwname, strlen(pwname));
1339         xfree(pwname);
1340         bzero(pwdir, strlen(pwdir));
1341         xfree(pwdir);
1342 }