openssh/ssh.c

   1 /* $OpenBSD: ssh.c,v 1.324 2009/02/12 03:00:56 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/socket.h>
  52
  53 #include <ctype.h>
  54 #include <errno.h>
  55 #include <fcntl.h>
  56 #include <netdb.h>
  57 #ifdef HAVE_PATHS_H
  58 #include <paths.h>
  59 #endif
  60 #include <pwd.h>
  61 #include <signal.h>
  62 #include <stdarg.h>
  63 #include <stddef.h>
  64 #include <stdio.h>
  65 #include <stdlib.h>
  66 #include <string.h>
  67 #include <unistd.h>
  68
  69 #include <netinet/in.h>
  70 #include <arpa/inet.h>
  71
  72 #include <openssl/evp.h>
  73 #include <openssl/err.h>
  74 #include "openbsd-compat/openssl-compat.h"
  75 #include "openbsd-compat/sys-queue.h"
  76
  77 #include "xmalloc.h"
  78 #include "ssh.h"
  79 #include "ssh1.h"
  80 #include "ssh2.h"
  81 #include "compat.h"
  82 #include "cipher.h"
  83 #include "packet.h"
  84 #include "buffer.h"
  85 #include "channels.h"
  86 #include "key.h"
  87 #include "authfd.h"
  88 #include "authfile.h"
  89 #include "pathnames.h"
  90 #include "dispatch.h"
  91 #include "clientloop.h"
  92 #include "log.h"
  93 #include "readconf.h"
  94 #include "sshconnect.h"
  95 #include "misc.h"
  96 #include "kex.h"
  97 #include "mac.h"
  98 #include "sshpty.h"
  99 #include "match.h"
 100 #include "msg.h"
 101 #include "uidswap.h"
 102 #include "version.h"
 103
 104 #ifdef SMARTCARD
 105 #include "scard.h"
 106 #endif
 107
 108 extern char *__progname;
 109
 110 /* Flag indicating whether debug mode is on.  May be set on the command line. */
 111 int debug_flag = 0;
 112
 113 /* Flag indicating whether a tty should be allocated */
 114 int tty_flag = 0;
 115 int no_tty_flag = 0;
 116 int force_tty_flag = 0;
 117
 118 /* don't exec a shell */
 119 int no_shell_flag = 0;
 120
 121 /*
 122  * Flag indicating that nothing should be read from stdin.  This can be set
 123  * on the command line.
 124  */
 125 int stdin_null_flag = 0;
 126
 127 /*
 128  * Flag indicating that ssh should fork after authentication.  This is useful
 129  * so that the passphrase can be entered manually, and then ssh goes to the
 130  * background.
 131  */
 132 int fork_after_authentication_flag = 0;
 133
 134 /*
 135  * General data structure for command line options and options configurable
 136  * in configuration files.  See readconf.h.
 137  */
 138 Options options;
 139
 140 /* optional user configfile */
 141 char *config = NULL;
 142
 143 /*
 144  * Name of the host we are connecting to.  This is the name given on the
 145  * command line, or the HostName specified for the user-supplied name in a
 146  * configuration file.
 147  */
 148 char *host;
 149
 150 /* socket address the host resolves to */
 151 struct sockaddr_storage hostaddr;
 152
 153 /* Private host keys. */
 154 Sensitive sensitive_data;
 155
 156 /* Original real UID. */
 157 uid_t original_real_uid;
 158 uid_t original_effective_uid;
 159
 160 /* command to be executed */
 161 Buffer command;
 162
 163 /* Should we execute a command or invoke a subsystem? */
 164 int subsystem_flag = 0;
 165
 166 /* # of replies received for global requests */
 167 static int remote_forward_confirms_received = 0;
 168
 169 /* pid of proxycommand child process */
 170 pid_t proxy_command_pid = 0;
 171
 172 /* mux.c */
 173 extern int muxserver_sock;
 174 extern u_int muxclient_command;
 175
 176 /* Prints a help message to the user.  This function never returns. */
 177
 178 static void
 179 usage(void)
 180 {
 181         fprintf(stderr,
 182 "usage: ssh [-1246AaCfgKkMNnqsTtVvXxYy] [-b bind_address] [-c cipher_spec]\n"
 183 "           [-D [bind_address:]port] [-e escape_char] [-F configfile]\n"
 184 "           [-i identity_file] [-L [bind_address:]port:host:hostport]\n"
 185 "           [-l login_name] [-m mac_spec] [-O ctl_cmd] [-o option] [-p port]\n"
 186 "           [-R [bind_address:]port:host:hostport] [-S ctl_path]\n"
 187 "           [-w local_tun[:remote_tun]] [user@]hostname [command]\n"
 188         );
 189         exit(255);
 190 }
 191
 192 static int ssh_session(void);
 193 static int ssh_session2(void);
 194 static void load_public_identity_files(void);
 195
 196 /* from muxclient.c */
 197 void muxclient(const char *);
 198 void muxserver_listen(void);
 199
 200 /*
 201  * Main program for the ssh client.
 202  */
 203 int
 204 main(int ac, char **av)
 205 {
 206         int i, opt, exit_status, use_syslog;
 207         char *p, *cp, *line, buf[256];
 208         struct stat st;
 209         struct passwd *pw;
 210         int dummy, timeout_ms;
 211         extern int optind, optreset;
 212         extern char *optarg;
 213         struct servent *sp;
 214         Forward fwd;
 215
 216         /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
 217         sanitise_stdfd();
 218
 219         __progname = ssh_get_progname(av[0]);
 220         init_rng();
 221
 222         /*
 223          * Save the original real uid.  It will be needed later (uid-swapping
 224          * may clobber the real uid).
 225          */
 226         original_real_uid = getuid();
 227         original_effective_uid = geteuid();
 228
 229         /*
 230          * Use uid-swapping to give up root privileges for the duration of
 231          * option processing.  We will re-instantiate the rights when we are
 232          * ready to create the privileged port, and will permanently drop
 233          * them when the port has been created (actually, when the connection
 234          * has been made, as we may need to create the port several times).
 235          */
 236         PRIV_END;
 237
 238 #ifdef HAVE_SETRLIMIT
 239         /* If we are installed setuid root be careful to not drop core. */
 240         if (original_real_uid != original_effective_uid) {
 241                 struct rlimit rlim;
 242                 rlim.rlim_cur = rlim.rlim_max = 0;
 243                 if (setrlimit(RLIMIT_CORE, &rlim) < 0)
 244                         fatal("setrlimit failed: %.100s", strerror(errno));
 245         }
 246 #endif
 247         /* Get user data. */
 248         pw = getpwuid(original_real_uid);
 249         if (!pw) {
 250                 logit("You don't exist, go away!");
 251                 exit(255);
 252         }
 253         /* Take a copy of the returned structure. */
 254         pw = pwcopy(pw);
 255
 256         /*
 257          * Set our umask to something reasonable, as some files are created
 258          * with the default umask.  This will make them world-readable but
 259          * writable only by the owner, which is ok for all files for which we
 260          * don't set the modes explicitly.
 261          */
 262         umask(022);
 263
 264         /*
 265          * Initialize option structure to indicate that no values have been
 266          * set.
 267          */
 268         initialize_options(&options);
 269
 270         /* Parse command-line arguments. */
 271         host = NULL;
 272         use_syslog = 0;
 273
 274  again:
 275         while ((opt = getopt(ac, av, "1246ab:c:e:fgi:kl:m:no:p:qstvx"
 276             "ACD:F:I:KL:MNO:PR:S:TVw:XYy")) != -1) {
 277                 switch (opt) {
 278                 case '1':
 279                         options.protocol = SSH_PROTO_1;
 280                         break;
 281                 case '2':
 282                         options.protocol = SSH_PROTO_2;
 283                         break;
 284                 case '4':
 285                         options.address_family = AF_INET;
 286                         break;
 287                 case '6':
 288                         options.address_family = AF_INET6;
 289                         break;
 290                 case 'n':
 291                         stdin_null_flag = 1;
 292                         break;
 293                 case 'f':
 294                         fork_after_authentication_flag = 1;
 295                         stdin_null_flag = 1;
 296                         break;
 297                 case 'x':
 298                         options.forward_x11 = 0;
 299                         break;
 300                 case 'X':
 301                         options.forward_x11 = 1;
 302                         break;
 303                 case 'y':
 304                         use_syslog = 1;
 305                         break;
 306                 case 'Y':
 307                         options.forward_x11 = 1;
 308                         options.forward_x11_trusted = 1;
 309                         break;
 310                 case 'g':
 311                         options.gateway_ports = 1;
 312                         break;
 313                 case 'O':
 314                         if (strcmp(optarg, "check") == 0)
 315                                 muxclient_command = SSHMUX_COMMAND_ALIVE_CHECK;
 316                         else if (strcmp(optarg, "exit") == 0)
 317                                 muxclient_command = SSHMUX_COMMAND_TERMINATE;
 318                         else
 319                                 fatal("Invalid multiplex command.");
 320                         break;
 321                 case 'P':       /* deprecated */
 322                         options.use_privileged_port = 0;
 323                         break;
 324                 case 'a':
 325                         options.forward_agent = 0;
 326                         break;
 327                 case 'A':
 328                         options.forward_agent = 1;
 329                         break;
 330                 case 'k':
 331                         options.gss_deleg_creds = 0;
 332                         break;
 333                 case 'K':
 334                         options.gss_authentication = 1;
 335                         options.gss_deleg_creds = 1;
 336                         break;
 337                 case 'i':
 338                         if (stat(optarg, &st) < 0) {
 339                                 fprintf(stderr, "Warning: Identity file %s "
 340                                     "not accessible: %s.\n", optarg,
 341                                     strerror(errno));
 342                                 break;
 343                         }
 344                         if (options.num_identity_files >=
 345                             SSH_MAX_IDENTITY_FILES)
 346                                 fatal("Too many identity files specified "
 347                                     "(max %d)", SSH_MAX_IDENTITY_FILES);
 348                         options.identity_files[options.num_identity_files++] =
 349                             xstrdup(optarg);
 350                         break;
 351                 case 'I':
 352 #ifdef SMARTCARD
 353                         options.smartcard_device = xstrdup(optarg);
 354 #else
 355                         fprintf(stderr, "no support for smartcards.\n");
 356 #endif
 357                         break;
 358                 case 't':
 359                         if (tty_flag)
 360                                 force_tty_flag = 1;
 361                         tty_flag = 1;
 362                         break;
 363                 case 'v':
 364                         if (debug_flag == 0) {
 365                                 debug_flag = 1;
 366                                 options.log_level = SYSLOG_LEVEL_DEBUG1;
 367                         } else {
 368                                 if (options.log_level < SYSLOG_LEVEL_DEBUG3)
 369                                         options.log_level++;
 370                                 break;
 371                         }
 372                         /* FALLTHROUGH */
 373                 case 'V':
 374                         fprintf(stderr, "%s, %s\n",
 375                             SSH_RELEASE, SSLeay_version(SSLEAY_VERSION));
 376                         if (opt == 'V')
 377                                 exit(0);
 378                         break;
 379                 case 'w':
 380                         if (options.tun_open == -1)
 381                                 options.tun_open = SSH_TUNMODE_DEFAULT;
 382                         options.tun_local = a2tun(optarg, &options.tun_remote);
 383                         if (options.tun_local == SSH_TUNID_ERR) {
 384                                 fprintf(stderr,
 385                                     "Bad tun device '%s'\n", optarg);
 386                                 exit(255);
 387                         }
 388                         break;
 389                 case 'q':
 390                         options.log_level = SYSLOG_LEVEL_QUIET;
 391                         break;
 392                 case 'e':
 393                         if (optarg[0] == '^' && optarg[2] == 0 &&
 394                             (u_char) optarg[1] >= 64 &&
 395                             (u_char) optarg[1] < 128)
 396                                 options.escape_char = (u_char) optarg[1] & 31;
 397                         else if (strlen(optarg) == 1)
 398                                 options.escape_char = (u_char) optarg[0];
 399                         else if (strcmp(optarg, "none") == 0)
 400                                 options.escape_char = SSH_ESCAPECHAR_NONE;
 401                         else {
 402                                 fprintf(stderr, "Bad escape character '%s'.\n",
 403                                     optarg);
 404                                 exit(255);
 405                         }
 406                         break;
 407                 case 'c':
 408                         if (ciphers_valid(optarg)) {
 409                                 /* SSH2 only */
 410                                 options.ciphers = xstrdup(optarg);
 411                                 options.cipher = SSH_CIPHER_INVALID;
 412                         } else {
 413                                 /* SSH1 only */
 414                                 options.cipher = cipher_number(optarg);
 415                                 if (options.cipher == -1) {
 416                                         fprintf(stderr,
 417                                             "Unknown cipher type '%s'\n",
 418                                             optarg);
 419                                         exit(255);
 420                                 }
 421                                 if (options.cipher == SSH_CIPHER_3DES)
 422                                         options.ciphers = "3des-cbc";
 423                                 else if (options.cipher == SSH_CIPHER_BLOWFISH)
 424                                         options.ciphers = "blowfish-cbc";
 425                                 else
 426                                         options.ciphers = (char *)-1;
 427                         }
 428                         break;
 429                 case 'm':
 430                         if (mac_valid(optarg))
 431                                 options.macs = xstrdup(optarg);
 432                         else {
 433                                 fprintf(stderr, "Unknown mac type '%s'\n",
 434                                     optarg);
 435                                 exit(255);
 436                         }
 437                         break;
 438                 case 'M':
 439                         if (options.control_master == SSHCTL_MASTER_YES)
 440                                 options.control_master = SSHCTL_MASTER_ASK;
 441                         else
 442                                 options.control_master = SSHCTL_MASTER_YES;
 443                         break;
 444                 case 'p':
 445                         options.port = a2port(optarg);
 446                         if (options.port <= 0) {
 447                                 fprintf(stderr, "Bad port '%s'\n", optarg);
 448                                 exit(255);
 449                         }
 450                         break;
 451                 case 'l':
 452                         options.user = optarg;
 453                         break;
 454
 455                 case 'L':
 456                         if (parse_forward(&fwd, optarg, 0, 0))
 457                                 add_local_forward(&options, &fwd);
 458                         else {
 459                                 fprintf(stderr,
 460                                     "Bad local forwarding specification '%s'\n",
 461                                     optarg);
 462                                 exit(255);
 463                         }
 464                         break;
 465
 466                 case 'R':
 467                         if (parse_forward(&fwd, optarg, 0, 1)) {
 468                                 add_remote_forward(&options, &fwd);
 469                         } else {
 470                                 fprintf(stderr,
 471                                     "Bad remote forwarding specification "
 472                                     "'%s'\n", optarg);
 473                                 exit(255);
 474                         }
 475                         break;
 476
 477                 case 'D':
 478                         if (parse_forward(&fwd, optarg, 1, 0)) {
 479                                 add_local_forward(&options, &fwd);
 480                         } else {
 481                                 fprintf(stderr,
 482                                     "Bad dynamic forwarding specification "
 483                                     "'%s'\n", optarg);
 484                                 exit(255);
 485                         }
 486                         break;
 487
 488                 case 'C':
 489                         options.compression = 1;
 490                         break;
 491                 case 'N':
 492                         no_shell_flag = 1;
 493                         no_tty_flag = 1;
 494                         break;
 495                 case 'o':
 496                         dummy = 1;
 497                         line = xstrdup(optarg);
 498                         if (process_config_line(&options, host ? host : "",
 499                             line, "command-line", 0, &dummy) != 0)
 500                                 exit(255);
 501                         xfree(line);
 502                         break;
 503                 case 'T':
 504                         no_tty_flag = 1;
 505                         /* ensure that the user doesn't try to backdoor a */
 506                         /* null cipher switch on an interactive session */
 507                         /* so explicitly disable it no matter what */
 508                         options.none_switch=0;
 509                         break;
 510                 case 's':
 511                         subsystem_flag = 1;
 512                         break;
 513                 case 'S':
 514                         if (options.control_path != NULL)
 515                                 free(options.control_path);
 516                         options.control_path = xstrdup(optarg);
 517                         break;
 518                 case 'b':
 519                         options.bind_address = optarg;
 520                         break;
 521                 case 'F':
 522                         config = optarg;
 523                         break;
 524                 default:
 525                         usage();
 526                 }
 527         }
 528
 529         ac -= optind;
 530         av += optind;
 531
 532         if (ac > 0 && !host && **av != '-') {
 533                 if (strrchr(*av, '@')) {
 534                         p = xstrdup(*av);
 535                         cp = strrchr(p, '@');
 536                         if (cp == NULL || cp == p)
 537                                 usage();
 538                         options.user = p;
 539                         *cp = '\0';
 540                         host = ++cp;
 541                 } else
 542                         host = *av;
 543                 if (ac > 1) {
 544                         optind = optreset = 1;
 545                         goto again;
 546                 }
 547                 ac--, av++;
 548         }
 549
 550         /* Check that we got a host name. */
 551         if (!host)
 552                 usage();
 553
 554         SSLeay_add_all_algorithms();
 555         ERR_load_crypto_strings();
 556
 557         /* Initialize the command to execute on remote host. */
 558         buffer_init(&command);
 559
 560         /*
 561          * Save the command to execute on the remote host in a buffer. There
 562          * is no limit on the length of the command, except by the maximum
 563          * packet size.  Also sets the tty flag if there is no command.
 564          */
 565         if (!ac) {
 566                 /* No command specified - execute shell on a tty. */
 567                 tty_flag = 1;
 568                 if (subsystem_flag) {
 569                         fprintf(stderr,
 570                             "You must specify a subsystem to invoke.\n");
 571                         usage();
 572                 }
 573         } else {
 574                 /* A command has been specified.  Store it into the buffer. */
 575                 for (i = 0; i < ac; i++) {
 576                         if (i)
 577                                 buffer_append(&command, " ", 1);
 578                         buffer_append(&command, av[i], strlen(av[i]));
 579                 }
 580         }
 581
 582         /* Cannot fork to background if no command. */
 583         if (fork_after_authentication_flag && buffer_len(&command) == 0 &&
 584             !no_shell_flag)
 585                 fatal("Cannot fork into background without a command "
 586                     "to execute.");
 587
 588         /* Allocate a tty by default if no command specified. */
 589         if (buffer_len(&command) == 0)
 590                 tty_flag = 1;
 591
 592         /* Force no tty */
 593         if (no_tty_flag)
 594                 tty_flag = 0;
 595         /* Do not allocate a tty if stdin is not a tty. */
 596         if ((!isatty(fileno(stdin)) || stdin_null_flag) && !force_tty_flag) {
 597                 if (tty_flag)
 598                         logit("Pseudo-terminal will not be allocated because "
 599                             "stdin is not a terminal.");
 600                 tty_flag = 0;
 601         }
 602
 603         /*
 604          * Initialize "log" output.  Since we are the client all output
 605          * actually goes to stderr.
 606          */
 607         log_init(av[0],
 608             options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level,
 609             SYSLOG_FACILITY_USER, !use_syslog);
 610
 611         /*
 612          * Read per-user configuration file.  Ignore the system wide config
 613          * file if the user specifies a config file on the command line.
 614          */
 615         if (config != NULL) {
 616                 if (!read_config_file(config, host, &options, 0))
 617                         fatal("Can't open user config file %.100s: "
 618                             "%.100s", config, strerror(errno));
 619         } else {
 620                 snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir,
 621                     _PATH_SSH_USER_CONFFILE);
 622                 (void)read_config_file(buf, host, &options, 1);
 623
 624                 /* Read systemwide configuration file after use config. */
 625                 (void)read_config_file(_PATH_HOST_CONFIG_FILE, host,
 626                     &options, 0);
 627         }
 628
 629         /* Fill configuration defaults. */
 630         fill_default_options(&options);
 631
 632         channel_set_af(options.address_family);
 633
 634         /* reinit */
 635         log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, !use_syslog);
 636
 637         seed_rng();
 638
 639         if (options.user == NULL)
 640                 options.user = xstrdup(pw->pw_name);
 641
 642         /* Get default port if port has not been set. */
 643         if (options.port == 0) {
 644                 sp = getservbyname(SSH_SERVICE_NAME, "tcp");
 645                 options.port = sp ? ntohs(sp->s_port) : SSH_DEFAULT_PORT;
 646         }
 647
 648         if (options.local_command != NULL) {
 649                 char thishost[NI_MAXHOST];
 650
 651                 if (gethostname(thishost, sizeof(thishost)) == -1)
 652                         fatal("gethostname: %s", strerror(errno));
 653                 snprintf(buf, sizeof(buf), "%d", options.port);
 654                 debug3("expanding LocalCommand: %s", options.local_command);
 655                 cp = options.local_command;
 656                 options.local_command = percent_expand(cp, "d", pw->pw_dir,
 657                     "h", options.hostname? options.hostname : host,
 658                     "l", thishost, "n", host, "r", options.user, "p", buf,
 659                     "u", pw->pw_name, (char *)NULL);
 660                 debug3("expanded LocalCommand: %s", options.local_command);
 661                 xfree(cp);
 662         }
 663
 664         if (options.hostname != NULL)
 665                 host = options.hostname;
 666
 667         /* force lowercase for hostkey matching */
 668         if (options.host_key_alias != NULL) {
 669                 for (p = options.host_key_alias; *p; p++)
 670                         if (isupper(*p))
 671                                 *p = (char)tolower(*p);
 672         }
 673
 674         if (options.proxy_command != NULL &&
 675             strcmp(options.proxy_command, "none") == 0) {
 676                 xfree(options.proxy_command);
 677                 options.proxy_command = NULL;
 678         }
 679         if (options.control_path != NULL &&
 680             strcmp(options.control_path, "none") == 0) {
 681                 xfree(options.control_path);
 682                 options.control_path = NULL;
 683         }
 684
 685         if (options.control_path != NULL) {
 686                 char thishost[NI_MAXHOST];
 687
 688                 if (gethostname(thishost, sizeof(thishost)) == -1)
 689                         fatal("gethostname: %s", strerror(errno));
 690                 snprintf(buf, sizeof(buf), "%d", options.port);
 691                 cp = tilde_expand_filename(options.control_path,
 692                     original_real_uid);
 693                 xfree(options.control_path);
 694                 options.control_path = percent_expand(cp, "p", buf, "h", host,
 695                     "r", options.user, "l", thishost, (char *)NULL);
 696                 xfree(cp);
 697         }
 698         if (muxclient_command != 0 && options.control_path == NULL)
 699                 fatal("No ControlPath specified for \"-O\" command");
 700         if (options.control_path != NULL)
 701                 muxclient(options.control_path);
 702
 703         timeout_ms = options.connection_timeout * 1000;
 704
 705         /* Open a connection to the remote host. */
 706         if (ssh_connect(host, &hostaddr, options.port,
 707             options.address_family, options.connection_attempts, &timeout_ms,
 708             options.tcp_keep_alive,
 709 #ifdef HAVE_CYGWIN
 710             options.use_privileged_port,
 711 #else
 712             original_effective_uid == 0 && options.use_privileged_port,
 713 #endif
 714             options.proxy_command) != 0)
 715                 exit(255);
 716
 717         if (timeout_ms > 0)
 718                 debug3("timeout: %d ms remain after connect", timeout_ms);
 719
 720         /*
 721          * If we successfully made the connection, load the host private key
 722          * in case we will need it later for combined rsa-rhosts
 723          * authentication. This must be done before releasing extra
 724          * privileges, because the file is only readable by root.
 725          * If we cannot access the private keys, load the public keys
 726          * instead and try to execute the ssh-keysign helper instead.
 727          */
 728         sensitive_data.nkeys = 0;
 729         sensitive_data.keys = NULL;
 730         sensitive_data.external_keysign = 0;
 731         if (options.rhosts_rsa_authentication ||
 732             options.hostbased_authentication) {
 733                 sensitive_data.nkeys = 3;
 734                 sensitive_data.keys = xcalloc(sensitive_data.nkeys,
 735                     sizeof(Key));
 736
 737                 PRIV_START;
 738                 sensitive_data.keys[0] = key_load_private_type(KEY_RSA1,
 739                     _PATH_HOST_KEY_FILE, "", NULL, NULL);
 740                 sensitive_data.keys[1] = key_load_private_type(KEY_DSA,
 741                     _PATH_HOST_DSA_KEY_FILE, "", NULL, NULL);
 742                 sensitive_data.keys[2] = key_load_private_type(KEY_RSA,
 743                     _PATH_HOST_RSA_KEY_FILE, "", NULL, NULL);
 744                 PRIV_END;
 745
 746                 if (options.hostbased_authentication == 1 &&
 747                     sensitive_data.keys[0] == NULL &&
 748                     sensitive_data.keys[1] == NULL &&
 749                     sensitive_data.keys[2] == NULL) {
 750                         sensitive_data.keys[1] = key_load_public(
 751                             _PATH_HOST_DSA_KEY_FILE, NULL);
 752                         sensitive_data.keys[2] = key_load_public(
 753                             _PATH_HOST_RSA_KEY_FILE, NULL);
 754                         sensitive_data.external_keysign = 1;
 755                 }
 756         }
 757         /*
 758          * Get rid of any extra privileges that we may have.  We will no
 759          * longer need them.  Also, extra privileges could make it very hard
 760          * to read identity files and other non-world-readable files from the
 761          * user's home directory if it happens to be on a NFS volume where
 762          * root is mapped to nobody.
 763          */
 764         if (original_effective_uid == 0) {
 765                 PRIV_START;
 766                 permanently_set_uid(pw);
 767         }
 768
 769         /*
 770          * Now that we are back to our own permissions, create ~/.ssh
 771          * directory if it doesn't already exist.
 772          */
 773         snprintf(buf, sizeof buf, "%.100s%s%.100s", pw->pw_dir,
 774             strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR);
 775         if (stat(buf, &st) < 0)
 776                 if (mkdir(buf, 0700) < 0)
 777                         error("Could not create directory '%.200s'.", buf);
 778
 779         /* load options.identity_files */
 780         load_public_identity_files();
 781
 782         /* Expand ~ in known host file names. */
 783         /* XXX mem-leaks: */
 784         options.system_hostfile =
 785             tilde_expand_filename(options.system_hostfile, original_real_uid);
 786         options.user_hostfile =
 787             tilde_expand_filename(options.user_hostfile, original_real_uid);
 788         options.system_hostfile2 =
 789             tilde_expand_filename(options.system_hostfile2, original_real_uid);
 790         options.user_hostfile2 =
 791             tilde_expand_filename(options.user_hostfile2, original_real_uid);
 792
 793         signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
 794
 795         /* Log into the remote system.  Never returns if the login fails. */
 796         ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr,
 797             pw, timeout_ms);
 798
 799         /* We no longer need the private host keys.  Clear them now. */
 800         if (sensitive_data.nkeys != 0) {
 801                 for (i = 0; i < sensitive_data.nkeys; i++) {
 802                         if (sensitive_data.keys[i] != NULL) {
 803                                 /* Destroys contents safely */
 804                                 debug3("clear hostkey %d", i);
 805                                 key_free(sensitive_data.keys[i]);
 806                                 sensitive_data.keys[i] = NULL;
 807                         }
 808                 }
 809                 xfree(sensitive_data.keys);
 810         }
 811         for (i = 0; i < options.num_identity_files; i++) {
 812                 if (options.identity_files[i]) {
 813                         xfree(options.identity_files[i]);
 814                         options.identity_files[i] = NULL;
 815                 }
 816                 if (options.identity_keys[i]) {
 817                         key_free(options.identity_keys[i]);
 818                         options.identity_keys[i] = NULL;
 819                 }
 820         }
 821
 822         exit_status = compat20 ? ssh_session2() : ssh_session();
 823         packet_close();
 824
 825         if (options.control_path != NULL && muxserver_sock != -1)
 826                 unlink(options.control_path);
 827
 828         /*
 829          * Send SIGHUP to proxy command if used. We don't wait() in
 830          * case it hangs and instead rely on init to reap the child
 831          */
 832         if (proxy_command_pid > 1)
 833                 kill(proxy_command_pid, SIGHUP);
 834
 835         return exit_status;
 836 }
 837
 838 /* Callback for remote forward global requests */
 839 static void
 840 ssh_confirm_remote_forward(int type, u_int32_t seq, void *ctxt)
 841 {
 842         Forward *rfwd = (Forward *)ctxt;
 843
 844         /* XXX verbose() on failure? */
 845         debug("remote forward %s for: listen %d, connect %s:%d",
 846             type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
 847             rfwd->listen_port, rfwd->connect_host, rfwd->connect_port);
 848         if (type == SSH2_MSG_REQUEST_SUCCESS && rfwd->listen_port == 0) {
 849                 logit("Allocated port %u for remote forward to %s:%d",
 850                         packet_get_int(),
 851                         rfwd->connect_host, rfwd->connect_port);
 852         }
 853
 854         if (type == SSH2_MSG_REQUEST_FAILURE) {
 855                 if (options.exit_on_forward_failure)
 856                         fatal("Error: remote port forwarding failed for "
 857                             "listen port %d", rfwd->listen_port);
 858                 else
 859                         logit("Warning: remote port forwarding failed for "
 860                             "listen port %d", rfwd->listen_port);
 861         }
 862         if (++remote_forward_confirms_received == options.num_remote_forwards) {
 863                 debug("All remote forwarding requests processed");
 864                 if (fork_after_authentication_flag) {
 865                         fork_after_authentication_flag = 0;
 866                         if (daemon(1, 1) < 0)
 867                                 fatal("daemon() failed: %.200s",
 868                                     strerror(errno));
 869                 }
 870         }
 871 }
 872
 873 static void
 874 ssh_init_forwarding(void)
 875 {
 876         int success = 0;
 877         int i;
 878
 879         /* Initiate local TCP/IP port forwardings. */
 880         for (i = 0; i < options.num_local_forwards; i++) {
 881                 debug("Local connections to %.200s:%d forwarded to remote "
 882                     "address %.200s:%d",
 883                     (options.local_forwards[i].listen_host == NULL) ?
 884                     (options.gateway_ports ? "*" : "LOCALHOST") :
 885                     options.local_forwards[i].listen_host,
 886                     options.local_forwards[i].listen_port,
 887                     options.local_forwards[i].connect_host,
 888                     options.local_forwards[i].connect_port);
 889                 success += channel_setup_local_fwd_listener(
 890                     options.local_forwards[i].listen_host,
 891                     options.local_forwards[i].listen_port,
 892                     options.local_forwards[i].connect_host,
 893                     options.local_forwards[i].connect_port,
 894                     options.gateway_ports);
 895         }
 896         if (i > 0 && success != i && options.exit_on_forward_failure)
 897                 fatal("Could not request local forwarding.");
 898         if (i > 0 && success == 0)
 899                 error("Could not request local forwarding.");
 900
 901         /* Initiate remote TCP/IP port forwardings. */
 902         for (i = 0; i < options.num_remote_forwards; i++) {
 903                 debug("Remote connections from %.200s:%d forwarded to "
 904                     "local address %.200s:%d",
 905                     (options.remote_forwards[i].listen_host == NULL) ?
 906                     "LOCALHOST" : options.remote_forwards[i].listen_host,
 907                     options.remote_forwards[i].listen_port,
 908                     options.remote_forwards[i].connect_host,
 909                     options.remote_forwards[i].connect_port);
 910                 if (channel_request_remote_forwarding(
 911                     options.remote_forwards[i].listen_host,
 912                     options.remote_forwards[i].listen_port,
 913                     options.remote_forwards[i].connect_host,
 914                     options.remote_forwards[i].connect_port) < 0) {
 915                         if (options.exit_on_forward_failure)
 916                                 fatal("Could not request remote forwarding.");
 917                         else
 918                                 logit("Warning: Could not request remote "
 919                                     "forwarding.");
 920                 }
 921                 client_register_global_confirm(ssh_confirm_remote_forward,
 922                     &options.remote_forwards[i]);
 923         }
 924
 925         /* Initiate tunnel forwarding. */
 926         if (options.tun_open != SSH_TUNMODE_NO) {
 927                 if (client_request_tun_fwd(options.tun_open,
 928                     options.tun_local, options.tun_remote) == -1) {
 929                         if (options.exit_on_forward_failure)
 930                                 fatal("Could not request tunnel forwarding.");
 931                         else
 932                                 error("Could not request tunnel forwarding.");
 933                 }
 934         }
 935 }
 936
 937 static void
 938 check_agent_present(void)
 939 {
 940         if (options.forward_agent) {
 941                 /* Clear agent forwarding if we don't have an agent. */
 942                 if (!ssh_agent_present())
 943                         options.forward_agent = 0;
 944         }
 945 }
 946
 947 static int
 948 ssh_session(void)
 949 {
 950         int type;
 951         int interactive = 0;
 952         int have_tty = 0;
 953         struct winsize ws;
 954         char *cp;
 955         const char *display;
 956
 957         /* Enable compression if requested. */
 958         if (options.compression) {
 959                 debug("Requesting compression at level %d.",
 960                     options.compression_level);
 961
 962                 if (options.compression_level < 1 ||
 963                     options.compression_level > 9)
 964                         fatal("Compression level must be from 1 (fast) to "
 965                             "9 (slow, best).");
 966
 967                 /* Send the request. */
 968                 packet_start(SSH_CMSG_REQUEST_COMPRESSION);
 969                 packet_put_int(options.compression_level);
 970                 packet_send();
 971                 packet_write_wait();
 972                 type = packet_read();
 973                 if (type == SSH_SMSG_SUCCESS)
 974                         packet_start_compression(options.compression_level);
 975                 else if (type == SSH_SMSG_FAILURE)
 976                         logit("Warning: Remote host refused compression.");
 977                 else
 978                         packet_disconnect("Protocol error waiting for "
 979                             "compression response.");
 980         }
 981         /* Allocate a pseudo tty if appropriate. */
 982         if (tty_flag) {
 983                 debug("Requesting pty.");
 984
 985                 /* Start the packet. */
 986                 packet_start(SSH_CMSG_REQUEST_PTY);
 987
 988                 /* Store TERM in the packet.  There is no limit on the
 989                    length of the string. */
 990                 cp = getenv("TERM");
 991                 if (!cp)
 992                         cp = "";
 993                 packet_put_cstring(cp);
 994
 995                 /* Store window size in the packet. */
 996                 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
 997                         memset(&ws, 0, sizeof(ws));
 998                 packet_put_int((u_int)ws.ws_row);
 999                 packet_put_int((u_int)ws.ws_col);
1000                 packet_put_int((u_int)ws.ws_xpixel);
1001                 packet_put_int((u_int)ws.ws_ypixel);
1002
1003                 /* Store tty modes in the packet. */
1004                 tty_make_modes(fileno(stdin), NULL);
1005
1006                 /* Send the packet, and wait for it to leave. */
1007                 packet_send();
1008                 packet_write_wait();
1009
1010                 /* Read response from the server. */
1011                 type = packet_read();
1012                 if (type == SSH_SMSG_SUCCESS) {
1013                         interactive = 1;
1014                         have_tty = 1;
1015                 } else if (type == SSH_SMSG_FAILURE)
1016                         logit("Warning: Remote host failed or refused to "
1017                             "allocate a pseudo tty.");
1018                 else
1019                         packet_disconnect("Protocol error waiting for pty "
1020                             "request response.");
1021         }
1022         /* Request X11 forwarding if enabled and DISPLAY is set. */
1023         display = getenv("DISPLAY");
1024         if (options.forward_x11 && display != NULL) {
1025                 char *proto, *data;
1026                 /* Get reasonable local authentication information. */
1027                 client_x11_get_proto(display, options.xauth_location,
1028                     options.forward_x11_trusted, &proto, &data);
1029                 /* Request forwarding with authentication spoofing. */
1030                 debug("Requesting X11 forwarding with authentication "
1031                     "spoofing.");
1032                 x11_request_forwarding_with_spoofing(0, display, proto, data);
1033
1034                 /* Read response from the server. */
1035                 type = packet_read();
1036                 if (type == SSH_SMSG_SUCCESS) {
1037                         interactive = 1;
1038                 } else if (type == SSH_SMSG_FAILURE) {
1039                         logit("Warning: Remote host denied X11 forwarding.");
1040                 } else {
1041                         packet_disconnect("Protocol error waiting for X11 "
1042                             "forwarding");
1043                 }
1044         }
1045         /* Tell the packet module whether this is an interactive session. */
1046         packet_set_interactive(interactive);
1047
1048         /* Request authentication agent forwarding if appropriate. */
1049         check_agent_present();
1050
1051         if (options.forward_agent) {
1052                 debug("Requesting authentication agent forwarding.");
1053                 auth_request_forwarding();
1054
1055                 /* Read response from the server. */
1056                 type = packet_read();
1057                 packet_check_eom();
1058                 if (type != SSH_SMSG_SUCCESS)
1059                         logit("Warning: Remote host denied authentication agent forwarding.");
1060         }
1061
1062         /* Initiate port forwardings. */
1063         ssh_init_forwarding();
1064
1065         /* Execute a local command */
1066         if (options.local_command != NULL &&
1067             options.permit_local_command)
1068                 ssh_local_cmd(options.local_command);
1069
1070         /*
1071          * If requested and we are not interested in replies to remote
1072          * forwarding requests, then let ssh continue in the background.
1073          */
1074         if (fork_after_authentication_flag &&
1075             (!options.exit_on_forward_failure ||
1076             options.num_remote_forwards == 0)) {
1077                 fork_after_authentication_flag = 0;
1078                 if (daemon(1, 1) < 0)
1079                         fatal("daemon() failed: %.200s", strerror(errno));
1080         }
1081
1082         /*
1083          * If a command was specified on the command line, execute the
1084          * command now. Otherwise request the server to start a shell.
1085          */
1086         if (buffer_len(&command) > 0) {
1087                 int len = buffer_len(&command);
1088                 if (len > 900)
1089                         len = 900;
1090                 debug("Sending command: %.*s", len,
1091                     (u_char *)buffer_ptr(&command));
1092                 packet_start(SSH_CMSG_EXEC_CMD);
1093                 packet_put_string(buffer_ptr(&command), buffer_len(&command));
1094                 packet_send();
1095                 packet_write_wait();
1096         } else {
1097                 debug("Requesting shell.");
1098                 packet_start(SSH_CMSG_EXEC_SHELL);
1099                 packet_send();
1100                 packet_write_wait();
1101         }
1102
1103         /* Enter the interactive session. */
1104         return client_loop(have_tty, tty_flag ?
1105             options.escape_char : SSH_ESCAPECHAR_NONE, 0);
1106 }
1107
1108 /* request pty/x11/agent/tcpfwd/shell for channel */
1109 static void
1110 ssh_session2_setup(int id, void *arg)
1111 {
1112         extern char **environ;
1113         const char *display;
1114         int interactive = tty_flag;
1115
1116         display = getenv("DISPLAY");
1117         if (options.forward_x11 && display != NULL) {
1118                 char *proto, *data;
1119                 /* Get reasonable local authentication information. */
1120                 client_x11_get_proto(display, options.xauth_location,
1121                     options.forward_x11_trusted, &proto, &data);
1122                 /* Request forwarding with authentication spoofing. */
1123                 debug("Requesting X11 forwarding with authentication "
1124                     "spoofing.");
1125                 x11_request_forwarding_with_spoofing(id, display, proto, data);
1126                 interactive = 1;
1127                 /* XXX wait for reply */
1128         }
1129
1130         check_agent_present();
1131         if (options.forward_agent) {
1132                 debug("Requesting authentication agent forwarding.");
1133                 channel_request_start(id, "auth-agent-req@openssh.com", 0);
1134                 packet_send();
1135         }
1136
1137         client_session2_setup(id, tty_flag, subsystem_flag, getenv("TERM"),
1138             NULL, fileno(stdin), &command, environ);
1139
1140         packet_set_interactive(interactive);
1141 }
1142
1143 /* open new channel for a session */
1144 static int
1145 ssh_session2_open(void)
1146 {
1147         Channel *c;
1148         int window, packetmax, in, out, err;
1149         int sock;
1150         int socksize;
1151         int socksizelen = sizeof(int);
1152
1153         if (stdin_null_flag) {
1154                 in = open(_PATH_DEVNULL, O_RDONLY);
1155         } else {
1156                 in = dup(STDIN_FILENO);
1157         }
1158         out = dup(STDOUT_FILENO);
1159         err = dup(STDERR_FILENO);
1160
1161         if (in < 0 || out < 0 || err < 0)
1162                 fatal("dup() in/out/err failed");
1163
1164         /* enable nonblocking unless tty */
1165         if (!isatty(in))
1166                 set_nonblock(in);
1167         if (!isatty(out))
1168                 set_nonblock(out);
1169         if (!isatty(err))
1170                 set_nonblock(err);
1171
1172         /* we need to check to see if what they want to do about buffer */
1173         /* sizes here. In a hpn to nonhpn connection we want to limit */
1174         /* the window size to something reasonable in case the far side */
1175         /* has the large window bug. In hpn to hpn connection we want to */
1176         /* use the max window size but allow the user to override it */
1177         /* lastly if they disabled hpn then use the ssh std window size */
1178
1179         /* so why don't we just do a getsockopt() here and set the */
1180         /* ssh window to that? In the case of a autotuning receive */
1181         /* window the window would get stuck at the initial buffer */
1182         /* size generally less than 96k. Therefore we need to set the */
1183         /* maximum ssh window size to the maximum hpn buffer size */
1184         /* unless the user has specifically set the tcprcvbufpoll */
1185         /* to no. In which case we *can* just set the window to the */
1186         /* minimum of the hpn buffer size and tcp receive buffer size */
1187
1188         if (tty_flag)
1189                 options.hpn_buffer_size = CHAN_SES_WINDOW_DEFAULT;
1190         else
1191                 options.hpn_buffer_size = 2*1024*1024;
1192
1193         if (datafellows & SSH_BUG_LARGEWINDOW)
1194         {
1195                 debug("HPN to Non-HPN Connection");
1196         }
1197         else
1198         {
1199                 if (options.tcp_rcv_buf_poll <= 0)
1200                 {
1201                         sock = socket(AF_INET, SOCK_STREAM, 0);
1202                         getsockopt(sock, SOL_SOCKET, SO_RCVBUF,
1203                                    &socksize, &socksizelen);
1204                         close(sock);
1205                         debug("socksize %d", socksize);
1206                         options.hpn_buffer_size = socksize;
1207                         debug ("HPNBufferSize set to TCP RWIN: %d", options.hpn_buffer_size);
1208                 }
1209                 else
1210                 {
1211                         if (options.tcp_rcv_buf > 0)
1212                         {
1213                                 /*create a socket but don't connect it */
1214                                 /* we use that the get the rcv socket size */
1215                                 sock = socket(AF_INET, SOCK_STREAM, 0);
1216                                 /* if they are using the tcp_rcv_buf option */
1217                                 /* attempt to set the buffer size to that */
1218                                 if (options.tcp_rcv_buf)
1219                                         setsockopt(sock, SOL_SOCKET, SO_RCVBUF, (void *)&options.tcp_rcv_buf,
1220                                                    sizeof(options.tcp_rcv_buf));
1221                                 getsockopt(sock, SOL_SOCKET, SO_RCVBUF,
1222                                            &socksize, &socksizelen);
1223                                 close(sock);
1224                                 debug("socksize %d", socksize);
1225                                 options.hpn_buffer_size = socksize;
1226                                 debug ("HPNBufferSize set to user TCPRcvBuf: %d", options.hpn_buffer_size);
1227                         }
1228                 }
1229
1230         }
1231
1232         debug("Final hpn_buffer_size = %d", options.hpn_buffer_size);
1233
1234         window = options.hpn_buffer_size;
1235
1236         channel_set_hpn(options.hpn_disabled, options.hpn_buffer_size);
1237
1238         packetmax = CHAN_SES_PACKET_DEFAULT;
1239         if (tty_flag) {
1240                 window = 4*CHAN_SES_PACKET_DEFAULT;
1241                 window >>= 1;
1242                 packetmax >>= 1;
1243         }
1244         c = channel_new(
1245             "session", SSH_CHANNEL_OPENING, in, out, err,
1246             window, packetmax, CHAN_EXTENDED_WRITE,
1247             "client-session", /*nonblock*/0);
1248         if ((options.tcp_rcv_buf_poll > 0) && (!options.hpn_disabled)) {
1249                 c->dynamic_window = 1;
1250                 debug ("Enabled Dynamic Window Scaling\n");
1251         }
1252         debug3("ssh_session2_open: channel_new: %d", c->self);
1253
1254         channel_send_open(c->self);
1255         if (!no_shell_flag)
1256                 channel_register_open_confirm(c->self,
1257                     ssh_session2_setup, NULL);
1258
1259         return c->self;
1260 }
1261
1262 static int
1263 ssh_session2(void)
1264 {
1265         int id = -1;
1266
1267         /* XXX should be pre-session */
1268         ssh_init_forwarding();
1269
1270         if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN))
1271                 id = ssh_session2_open();
1272
1273         /* If we don't expect to open a new session, then disallow it */
1274         if (options.control_master == SSHCTL_MASTER_NO &&
1275             (datafellows & SSH_NEW_OPENSSH)) {
1276                 debug("Requesting no-more-sessions@openssh.com");
1277                 packet_start(SSH2_MSG_GLOBAL_REQUEST);
1278                 packet_put_cstring("no-more-sessions@openssh.com");
1279                 packet_put_char(0);
1280                 packet_send();
1281         }
1282
1283         /* Execute a local command */
1284         if (options.local_command != NULL &&
1285             options.permit_local_command)
1286                 ssh_local_cmd(options.local_command);
1287
1288         /* Start listening for multiplex clients */
1289         muxserver_listen();
1290
1291         /* If requested, let ssh continue in the background. */
1292         if (fork_after_authentication_flag) {
1293                 fork_after_authentication_flag = 0;
1294                 if (daemon(1, 1) < 0)
1295                         fatal("daemon() failed: %.200s", strerror(errno));
1296         }
1297
1298         return client_loop(tty_flag, tty_flag ?
1299             options.escape_char : SSH_ESCAPECHAR_NONE, id);
1300 }
1301
1302 static void
1303 load_public_identity_files(void)
1304 {
1305         char *filename, *cp, thishost[NI_MAXHOST];
1306         char *pwdir = NULL, *pwname = NULL;
1307         int i = 0;
1308         Key *public;
1309         struct passwd *pw;
1310 #ifdef SMARTCARD
1311         Key **keys;
1312
1313         if (options.smartcard_device != NULL &&
1314             options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
1315             (keys = sc_get_keys(options.smartcard_device, NULL)) != NULL) {
1316                 int count = 0;
1317                 for (i = 0; keys[i] != NULL; i++) {
1318                         count++;
1319                         memmove(&options.identity_files[1],
1320                             &options.identity_files[0],
1321                             sizeof(char *) * (SSH_MAX_IDENTITY_FILES - 1));
1322                         memmove(&options.identity_keys[1],
1323                             &options.identity_keys[0],
1324                             sizeof(Key *) * (SSH_MAX_IDENTITY_FILES - 1));
1325                         options.num_identity_files++;
1326                         options.identity_keys[0] = keys[i];
1327                         options.identity_files[0] = sc_get_key_label(keys[i]);
1328                 }
1329                 if (options.num_identity_files > SSH_MAX_IDENTITY_FILES)
1330                         options.num_identity_files = SSH_MAX_IDENTITY_FILES;
1331                 i = count;
1332                 xfree(keys);
1333         }
1334 #endif /* SMARTCARD */
1335         if ((pw = getpwuid(original_real_uid)) == NULL)
1336                 fatal("load_public_identity_files: getpwuid failed");
1337         pwname = xstrdup(pw->pw_name);
1338         pwdir = xstrdup(pw->pw_dir);
1339         if (gethostname(thishost, sizeof(thishost)) == -1)
1340                 fatal("load_public_identity_files: gethostname: %s",
1341                     strerror(errno));
1342         for (; i < options.num_identity_files; i++) {
1343                 cp = tilde_expand_filename(options.identity_files[i],
1344                     original_real_uid);
1345                 filename = percent_expand(cp, "d", pwdir,
1346                     "u", pwname, "l", thishost, "h", host,
1347                     "r", options.user, (char *)NULL);
1348                 xfree(cp);
1349                 public = key_load_public(filename, NULL);
1350                 debug("identity file %s type %d", filename,
1351                     public ? public->type : -1);
1352                 xfree(options.identity_files[i]);
1353                 options.identity_files[i] = filename;
1354                 options.identity_keys[i] = public;
1355         }
1356         bzero(pwname, strlen(pwname));
1357         xfree(pwname);
1358         bzero(pwdir, strlen(pwdir));
1359         xfree(pwdir);
1360 }