ssh.c

   1 /*
   2  * Author: Tatu Ylonen <ylo@cs.hut.fi>
   3  * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
   4  *                    All rights reserved
   5  * Ssh client program.  This program can be used to log into a remote machine.
   6  * The software supports strong authentication, encryption, and forwarding
   7  * of X11, TCP/IP, and authentication connections.
   8  *
   9  * As far as I am concerned, the code I have written for this software
  10  * can be used freely for any purpose.  Any derived versions of this
  11  * software must be clearly marked as such, and if the derived work is
  12  * incompatible with the protocol description in the RFC file, it must be
  13  * called by a name other than "ssh" or "Secure Shell".
  14  *
  15  * Copyright (c) 1999 Niels Provos.  All rights reserved.
  16  * Copyright (c) 2000, 2001, 2002, 2003 Markus Friedl.  All rights reserved.
  17  *
  18  * Modified to work with SSL by Niels Provos <provos@citi.umich.edu>
  19  * in Canada (German citizen).
  20  *
  21  * Redistribution and use in source and binary forms, with or without
  22  * modification, are permitted provided that the following conditions
  23  * are met:
  24  * 1. Redistributions of source code must retain the above copyright
  25  *    notice, this list of conditions and the following disclaimer.
  26  * 2. Redistributions in binary form must reproduce the above copyright
  27  *    notice, this list of conditions and the following disclaimer in the
  28  *    documentation and/or other materials provided with the distribution.
  29  *
  30  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  31  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  32  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  33  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  34  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  35  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  36  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  37  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  38  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  39  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  40  */
  41
  42 #include "includes.h"
  43 RCSID("$OpenBSD: ssh.c,v 1.214 2004/06/13 15:03:02 djm Exp $");
  44
  45 #include <openssl/evp.h>
  46 #include <openssl/err.h>
  47
  48 #include "ssh.h"
  49 #include "ssh1.h"
  50 #include "ssh2.h"
  51 #include "compat.h"
  52 #include "cipher.h"
  53 #include "xmalloc.h"
  54 #include "packet.h"
  55 #include "buffer.h"
  56 #include "bufaux.h"
  57 #include "channels.h"
  58 #include "key.h"
  59 #include "authfd.h"
  60 #include "authfile.h"
  61 #include "pathnames.h"
  62 #include "dispatch.h"
  63 #include "clientloop.h"
  64 #include "log.h"
  65 #include "readconf.h"
  66 #include "sshconnect.h"
  67 #include "misc.h"
  68 #include "kex.h"
  69 #include "mac.h"
  70 #include "sshpty.h"
  71 #include "match.h"
  72 #include "msg.h"
  73 #include "monitor_fdpass.h"
  74
  75 #ifdef SMARTCARD
  76 #include "scard.h"
  77 #endif
  78
  79 #ifdef HAVE___PROGNAME
  80 extern char *__progname;
  81 #else
  82 char *__progname;
  83 #endif
  84
  85 /* Flag indicating whether debug mode is on.  This can be set on the command line. */
  86 int debug_flag = 0;
  87
  88 /* Flag indicating whether a tty should be allocated */
  89 int tty_flag = 0;
  90 int no_tty_flag = 0;
  91 int force_tty_flag = 0;
  92
  93 /* don't exec a shell */
  94 int no_shell_flag = 0;
  95
  96 /*
  97  * Flag indicating that nothing should be read from stdin.  This can be set
  98  * on the command line.
  99  */
 100 int stdin_null_flag = 0;
 101
 102 /*
 103  * Flag indicating that ssh should fork after authentication.  This is useful
 104  * so that the passphrase can be entered manually, and then ssh goes to the
 105  * background.
 106  */
 107 int fork_after_authentication_flag = 0;
 108
 109 /*
 110  * General data structure for command line options and options configurable
 111  * in configuration files.  See readconf.h.
 112  */
 113 Options options;
 114
 115 /* optional user configfile */
 116 char *config = NULL;
 117
 118 /*
 119  * Name of the host we are connecting to.  This is the name given on the
 120  * command line, or the HostName specified for the user-supplied name in a
 121  * configuration file.
 122  */
 123 char *host;
 124
 125 /* socket address the host resolves to */
 126 struct sockaddr_storage hostaddr;
 127
 128 /* Private host keys. */
 129 Sensitive sensitive_data;
 130
 131 /* Original real UID. */
 132 uid_t original_real_uid;
 133 uid_t original_effective_uid;
 134
 135 /* command to be executed */
 136 Buffer command;
 137
 138 /* Should we execute a command or invoke a subsystem? */
 139 int subsystem_flag = 0;
 140
 141 /* # of replies received for global requests */
 142 static int client_global_request_id = 0;
 143
 144 /* pid of proxycommand child process */
 145 pid_t proxy_command_pid = 0;
 146
 147 /* fd to control socket */
 148 int control_fd = -1;
 149
 150 /* Only used in control client mode */
 151 volatile sig_atomic_t control_client_terminate = 0;
 152 u_int control_server_pid = 0;
 153
 154 /* Prints a help message to the user.  This function never returns. */
 155
 156 static void
 157 usage(void)
 158 {
 159         fprintf(stderr,
 160 "usage: ssh [-1246AaCfghkNnqsTtVvXxY] [-b bind_address] [-c cipher_spec]\n"
 161 "           [-D port] [-e escape_char] [-F configfile] [-i identity_file]\n"
 162 "           [-L port:host:hostport] [-l login_name] [-m mac_spec] [-o option]\n"
 163 "           [-p port] [-R port:host:hostport] [user@]hostname [command]\n"
 164         );
 165         exit(1);
 166 }
 167
 168 static int ssh_session(void);
 169 static int ssh_session2(void);
 170 static void load_public_identity_files(void);
 171 static void control_client(const char *path);
 172
 173 /*
 174  * Main program for the ssh client.
 175  */
 176 int
 177 main(int ac, char **av)
 178 {
 179         int i, opt, exit_status;
 180         u_short fwd_port, fwd_host_port;
 181         char sfwd_port[6], sfwd_host_port[6];
 182         char *p, *cp, *line, buf[256];
 183         struct stat st;
 184         struct passwd *pw;
 185         int dummy;
 186         extern int optind, optreset;
 187         extern char *optarg;
 188
 189         __progname = ssh_get_progname(av[0]);
 190         init_rng();
 191
 192         /*
 193          * Save the original real uid.  It will be needed later (uid-swapping
 194          * may clobber the real uid).
 195          */
 196         original_real_uid = getuid();
 197         original_effective_uid = geteuid();
 198
 199         /*
 200          * Use uid-swapping to give up root privileges for the duration of
 201          * option processing.  We will re-instantiate the rights when we are
 202          * ready to create the privileged port, and will permanently drop
 203          * them when the port has been created (actually, when the connection
 204          * has been made, as we may need to create the port several times).
 205          */
 206         PRIV_END;
 207
 208 #ifdef HAVE_SETRLIMIT
 209         /* If we are installed setuid root be careful to not drop core. */
 210         if (original_real_uid != original_effective_uid) {
 211                 struct rlimit rlim;
 212                 rlim.rlim_cur = rlim.rlim_max = 0;
 213                 if (setrlimit(RLIMIT_CORE, &rlim) < 0)
 214                         fatal("setrlimit failed: %.100s", strerror(errno));
 215         }
 216 #endif
 217         /* Get user data. */
 218         pw = getpwuid(original_real_uid);
 219         if (!pw) {
 220                 logit("You don't exist, go away!");
 221                 exit(1);
 222         }
 223         /* Take a copy of the returned structure. */
 224         pw = pwcopy(pw);
 225
 226         /*
 227          * Set our umask to something reasonable, as some files are created
 228          * with the default umask.  This will make them world-readable but
 229          * writable only by the owner, which is ok for all files for which we
 230          * don't set the modes explicitly.
 231          */
 232         umask(022);
 233
 234         /* Initialize option structure to indicate that no values have been set. */
 235         initialize_options(&options);
 236
 237         /* Parse command-line arguments. */
 238         host = NULL;
 239
 240 again:
 241         while ((opt = getopt(ac, av,
 242             "1246ab:c:e:fgi:kl:m:no:p:qstvxACD:F:I:L:MNPR:S:TVXY")) != -1) {
 243                 switch (opt) {
 244                 case '1':
 245                         options.protocol = SSH_PROTO_1;
 246                         break;
 247                 case '2':
 248                         options.protocol = SSH_PROTO_2;
 249                         break;
 250                 case '4':
 251                         options.address_family = AF_INET;
 252                         break;
 253                 case '6':
 254                         options.address_family = AF_INET6;
 255                         break;
 256                 case 'n':
 257                         stdin_null_flag = 1;
 258                         break;
 259                 case 'f':
 260                         fork_after_authentication_flag = 1;
 261                         stdin_null_flag = 1;
 262                         break;
 263                 case 'x':
 264                         options.forward_x11 = 0;
 265                         break;
 266                 case 'X':
 267                         options.forward_x11 = 1;
 268                         break;
 269                 case 'Y':
 270                         options.forward_x11 = 1;
 271                         options.forward_x11_trusted = 1;
 272                         break;
 273                 case 'g':
 274                         options.gateway_ports = 1;
 275                         break;
 276                 case 'P':       /* deprecated */
 277                         options.use_privileged_port = 0;
 278                         break;
 279                 case 'a':
 280                         options.forward_agent = 0;
 281                         break;
 282                 case 'A':
 283                         options.forward_agent = 1;
 284                         break;
 285                 case 'k':
 286                         options.gss_deleg_creds = 0;
 287                         break;
 288                 case 'i':
 289                         if (stat(optarg, &st) < 0) {
 290                                 fprintf(stderr, "Warning: Identity file %s "
 291                                     "does not exist.\n", optarg);
 292                                 break;
 293                         }
 294                         if (options.num_identity_files >=
 295                             SSH_MAX_IDENTITY_FILES)
 296                                 fatal("Too many identity files specified "
 297                                     "(max %d)", SSH_MAX_IDENTITY_FILES);
 298                         options.identity_files[options.num_identity_files++] =
 299                             xstrdup(optarg);
 300                         break;
 301                 case 'I':
 302 #ifdef SMARTCARD
 303                         options.smartcard_device = xstrdup(optarg);
 304 #else
 305                         fprintf(stderr, "no support for smartcards.\n");
 306 #endif
 307                         break;
 308                 case 't':
 309                         if (tty_flag)
 310                                 force_tty_flag = 1;
 311                         tty_flag = 1;
 312                         break;
 313                 case 'v':
 314                         if (debug_flag == 0) {
 315                                 debug_flag = 1;
 316                                 options.log_level = SYSLOG_LEVEL_DEBUG1;
 317                         } else {
 318                                 if (options.log_level < SYSLOG_LEVEL_DEBUG3)
 319                                         options.log_level++;
 320                                 break;
 321                         }
 322                         /* fallthrough */
 323                 case 'V':
 324                         fprintf(stderr, "%s, %s\n",
 325                             SSH_VERSION, SSLeay_version(SSLEAY_VERSION));
 326                         if (opt == 'V')
 327                                 exit(0);
 328                         break;
 329                 case 'q':
 330                         options.log_level = SYSLOG_LEVEL_QUIET;
 331                         break;
 332                 case 'e':
 333                         if (optarg[0] == '^' && optarg[2] == 0 &&
 334                             (u_char) optarg[1] >= 64 &&
 335                             (u_char) optarg[1] < 128)
 336                                 options.escape_char = (u_char) optarg[1] & 31;
 337                         else if (strlen(optarg) == 1)
 338                                 options.escape_char = (u_char) optarg[0];
 339                         else if (strcmp(optarg, "none") == 0)
 340                                 options.escape_char = SSH_ESCAPECHAR_NONE;
 341                         else {
 342                                 fprintf(stderr, "Bad escape character '%s'.\n",
 343                                     optarg);
 344                                 exit(1);
 345                         }
 346                         break;
 347                 case 'c':
 348                         if (ciphers_valid(optarg)) {
 349                                 /* SSH2 only */
 350                                 options.ciphers = xstrdup(optarg);
 351                                 options.cipher = SSH_CIPHER_ILLEGAL;
 352                         } else {
 353                                 /* SSH1 only */
 354                                 options.cipher = cipher_number(optarg);
 355                                 if (options.cipher == -1) {
 356                                         fprintf(stderr,
 357                                             "Unknown cipher type '%s'\n",
 358                                             optarg);
 359                                         exit(1);
 360                                 }
 361                                 if (options.cipher == SSH_CIPHER_3DES)
 362                                         options.ciphers = "3des-cbc";
 363                                 else if (options.cipher == SSH_CIPHER_BLOWFISH)
 364                                         options.ciphers = "blowfish-cbc";
 365                                 else
 366                                         options.ciphers = (char *)-1;
 367                         }
 368                         break;
 369                 case 'm':
 370                         if (mac_valid(optarg))
 371                                 options.macs = xstrdup(optarg);
 372                         else {
 373                                 fprintf(stderr, "Unknown mac type '%s'\n",
 374                                     optarg);
 375                                 exit(1);
 376                         }
 377                         break;
 378                 case 'M':
 379                         options.control_master = 1;
 380                         break;
 381                 case 'p':
 382                         options.port = a2port(optarg);
 383                         if (options.port == 0) {
 384                                 fprintf(stderr, "Bad port '%s'\n", optarg);
 385                                 exit(1);
 386                         }
 387                         break;
 388                 case 'l':
 389                         options.user = optarg;
 390                         break;
 391
 392                 case 'L':
 393                 case 'R':
 394                         if (sscanf(optarg, "%5[0123456789]:%255[^:]:%5[0123456789]",
 395                             sfwd_port, buf, sfwd_host_port) != 3 &&
 396                             sscanf(optarg, "%5[0123456789]/%255[^/]/%5[0123456789]",
 397                             sfwd_port, buf, sfwd_host_port) != 3) {
 398                                 fprintf(stderr,
 399                                     "Bad forwarding specification '%s'\n",
 400                                     optarg);
 401                                 usage();
 402                                 /* NOTREACHED */
 403                         }
 404                         if ((fwd_port = a2port(sfwd_port)) == 0 ||
 405                             (fwd_host_port = a2port(sfwd_host_port)) == 0) {
 406                                 fprintf(stderr,
 407                                     "Bad forwarding port(s) '%s'\n", optarg);
 408                                 exit(1);
 409                         }
 410                         if (opt == 'L')
 411                                 add_local_forward(&options, fwd_port, buf,
 412                                     fwd_host_port);
 413                         else if (opt == 'R')
 414                                 add_remote_forward(&options, fwd_port, buf,
 415                                     fwd_host_port);
 416                         break;
 417
 418                 case 'D':
 419                         fwd_port = a2port(optarg);
 420                         if (fwd_port == 0) {
 421                                 fprintf(stderr, "Bad dynamic port '%s'\n",
 422                                     optarg);
 423                                 exit(1);
 424                         }
 425                         add_local_forward(&options, fwd_port, "socks", 0);
 426                         break;
 427
 428                 case 'C':
 429                         options.compression = 1;
 430                         break;
 431                 case 'N':
 432                         no_shell_flag = 1;
 433                         no_tty_flag = 1;
 434                         break;
 435                 case 'T':
 436                         no_tty_flag = 1;
 437                         break;
 438                 case 'o':
 439                         dummy = 1;
 440                         line = xstrdup(optarg);
 441                         if (process_config_line(&options, host ? host : "",
 442                             line, "command-line", 0, &dummy) != 0)
 443                                 exit(1);
 444                         xfree(line);
 445                         break;
 446                 case 's':
 447                         subsystem_flag = 1;
 448                         break;
 449                 case 'S':
 450                         if (options.control_path != NULL)
 451                                 free(options.control_path);
 452                         options.control_path = xstrdup(optarg);
 453                         if (options.control_master == -1)
 454                                 options.control_master = 0;
 455                         break;
 456                 case 'b':
 457                         options.bind_address = optarg;
 458                         break;
 459                 case 'F':
 460                         config = optarg;
 461                         break;
 462                 default:
 463                         usage();
 464                 }
 465         }
 466
 467         ac -= optind;
 468         av += optind;
 469
 470         if (ac > 0 && !host && **av != '-') {
 471                 if (strrchr(*av, '@')) {
 472                         p = xstrdup(*av);
 473                         cp = strrchr(p, '@');
 474                         if (cp == NULL || cp == p)
 475                                 usage();
 476                         options.user = p;
 477                         *cp = '\0';
 478                         host = ++cp;
 479                 } else
 480                         host = *av;
 481                 if (ac > 1) {
 482                         optind = optreset = 1;
 483                         goto again;
 484                 }
 485                 ac--, av++;
 486         }
 487
 488         /* Check that we got a host name. */
 489         if (!host)
 490                 usage();
 491
 492         SSLeay_add_all_algorithms();
 493         ERR_load_crypto_strings();
 494
 495         /* Initialize the command to execute on remote host. */
 496         buffer_init(&command);
 497
 498         /*
 499          * Save the command to execute on the remote host in a buffer. There
 500          * is no limit on the length of the command, except by the maximum
 501          * packet size.  Also sets the tty flag if there is no command.
 502          */
 503         if (!ac) {
 504                 /* No command specified - execute shell on a tty. */
 505                 tty_flag = 1;
 506                 if (subsystem_flag) {
 507                         fprintf(stderr,
 508                             "You must specify a subsystem to invoke.\n");
 509                         usage();
 510                 }
 511         } else {
 512                 /* A command has been specified.  Store it into the buffer. */
 513                 for (i = 0; i < ac; i++) {
 514                         if (i)
 515                                 buffer_append(&command, " ", 1);
 516                         buffer_append(&command, av[i], strlen(av[i]));
 517                 }
 518         }
 519
 520         /* Cannot fork to background if no command. */
 521         if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag)
 522                 fatal("Cannot fork into background without a command to execute.");
 523
 524         /* Allocate a tty by default if no command specified. */
 525         if (buffer_len(&command) == 0)
 526                 tty_flag = 1;
 527
 528         /* Force no tty */
 529         if (no_tty_flag)
 530                 tty_flag = 0;
 531         /* Do not allocate a tty if stdin is not a tty. */
 532         if (!isatty(fileno(stdin)) && !force_tty_flag) {
 533                 if (tty_flag)
 534                         logit("Pseudo-terminal will not be allocated because stdin is not a terminal.");
 535                 tty_flag = 0;
 536         }
 537
 538         /*
 539          * Initialize "log" output.  Since we are the client all output
 540          * actually goes to stderr.
 541          */
 542         log_init(av[0], options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level,
 543             SYSLOG_FACILITY_USER, 1);
 544
 545         /*
 546          * Read per-user configuration file.  Ignore the system wide config
 547          * file if the user specifies a config file on the command line.
 548          */
 549         if (config != NULL) {
 550                 if (!read_config_file(config, host, &options, 0))
 551                         fatal("Can't open user config file %.100s: "
 552                             "%.100s", config, strerror(errno));
 553         } else  {
 554                 snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir,
 555                     _PATH_SSH_USER_CONFFILE);
 556                 (void)read_config_file(buf, host, &options, 1);
 557
 558                 /* Read systemwide configuration file after use config. */
 559                 (void)read_config_file(_PATH_HOST_CONFIG_FILE, host,
 560                     &options, 0);
 561         }
 562
 563         /* Fill configuration defaults. */
 564         fill_default_options(&options);
 565
 566         channel_set_af(options.address_family);
 567
 568         /* reinit */
 569         log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 1);
 570
 571         seed_rng();
 572
 573         if (options.user == NULL)
 574                 options.user = xstrdup(pw->pw_name);
 575
 576         if (options.hostname != NULL)
 577                 host = options.hostname;
 578
 579         /* force lowercase for hostkey matching */
 580         if (options.host_key_alias != NULL) {
 581                 for (p = options.host_key_alias; *p; p++)
 582                         if (isupper(*p))
 583                                 *p = tolower(*p);
 584         }
 585
 586         if (options.proxy_command != NULL &&
 587             strcmp(options.proxy_command, "none") == 0)
 588                 options.proxy_command = NULL;
 589
 590         if (options.control_path != NULL) {
 591                 options.control_path = tilde_expand_filename(
 592                    options.control_path, original_real_uid);
 593         }
 594         if (options.control_path != NULL && options.control_master == 0)
 595                 control_client(options.control_path); /* This doesn't return */
 596
 597         /* Open a connection to the remote host. */
 598         if (ssh_connect(host, &hostaddr, options.port,
 599             options.address_family, options.connection_attempts,
 600 #ifdef HAVE_CYGWIN
 601             options.use_privileged_port,
 602 #else
 603             original_effective_uid == 0 && options.use_privileged_port,
 604 #endif
 605             options.proxy_command) != 0)
 606                 exit(1);
 607
 608         /*
 609          * If we successfully made the connection, load the host private key
 610          * in case we will need it later for combined rsa-rhosts
 611          * authentication. This must be done before releasing extra
 612          * privileges, because the file is only readable by root.
 613          * If we cannot access the private keys, load the public keys
 614          * instead and try to execute the ssh-keysign helper instead.
 615          */
 616         sensitive_data.nkeys = 0;
 617         sensitive_data.keys = NULL;
 618         sensitive_data.external_keysign = 0;
 619         if (options.rhosts_rsa_authentication ||
 620             options.hostbased_authentication) {
 621                 sensitive_data.nkeys = 3;
 622                 sensitive_data.keys = xmalloc(sensitive_data.nkeys *
 623                     sizeof(Key));
 624
 625                 PRIV_START;
 626                 sensitive_data.keys[0] = key_load_private_type(KEY_RSA1,
 627                     _PATH_HOST_KEY_FILE, "", NULL);
 628                 sensitive_data.keys[1] = key_load_private_type(KEY_DSA,
 629                     _PATH_HOST_DSA_KEY_FILE, "", NULL);
 630                 sensitive_data.keys[2] = key_load_private_type(KEY_RSA,
 631                     _PATH_HOST_RSA_KEY_FILE, "", NULL);
 632                 PRIV_END;
 633
 634                 if (options.hostbased_authentication == 1 &&
 635                     sensitive_data.keys[0] == NULL &&
 636                     sensitive_data.keys[1] == NULL &&
 637                     sensitive_data.keys[2] == NULL) {
 638                         sensitive_data.keys[1] = key_load_public(
 639                             _PATH_HOST_DSA_KEY_FILE, NULL);
 640                         sensitive_data.keys[2] = key_load_public(
 641                             _PATH_HOST_RSA_KEY_FILE, NULL);
 642                         sensitive_data.external_keysign = 1;
 643                 }
 644         }
 645         /*
 646          * Get rid of any extra privileges that we may have.  We will no
 647          * longer need them.  Also, extra privileges could make it very hard
 648          * to read identity files and other non-world-readable files from the
 649          * user's home directory if it happens to be on a NFS volume where
 650          * root is mapped to nobody.
 651          */
 652         seteuid(original_real_uid);
 653         setuid(original_real_uid);
 654
 655         /*
 656          * Now that we are back to our own permissions, create ~/.ssh
 657          * directory if it doesn\'t already exist.
 658          */
 659         snprintf(buf, sizeof buf, "%.100s%s%.100s", pw->pw_dir, strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR);
 660         if (stat(buf, &st) < 0)
 661                 if (mkdir(buf, 0700) < 0)
 662                         error("Could not create directory '%.200s'.", buf);
 663
 664         /* load options.identity_files */
 665         load_public_identity_files();
 666
 667         /* Expand ~ in known host file names. */
 668         /* XXX mem-leaks: */
 669         options.system_hostfile =
 670             tilde_expand_filename(options.system_hostfile, original_real_uid);
 671         options.user_hostfile =
 672             tilde_expand_filename(options.user_hostfile, original_real_uid);
 673         options.system_hostfile2 =
 674             tilde_expand_filename(options.system_hostfile2, original_real_uid);
 675         options.user_hostfile2 =
 676             tilde_expand_filename(options.user_hostfile2, original_real_uid);
 677
 678         signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
 679
 680         /* Log into the remote system.  This never returns if the login fails. */
 681         ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr, pw);
 682
 683         /* We no longer need the private host keys.  Clear them now. */
 684         if (sensitive_data.nkeys != 0) {
 685                 for (i = 0; i < sensitive_data.nkeys; i++) {
 686                         if (sensitive_data.keys[i] != NULL) {
 687                                 /* Destroys contents safely */
 688                                 debug3("clear hostkey %d", i);
 689                                 key_free(sensitive_data.keys[i]);
 690                                 sensitive_data.keys[i] = NULL;
 691                         }
 692                 }
 693                 xfree(sensitive_data.keys);
 694         }
 695         for (i = 0; i < options.num_identity_files; i++) {
 696                 if (options.identity_files[i]) {
 697                         xfree(options.identity_files[i]);
 698                         options.identity_files[i] = NULL;
 699                 }
 700                 if (options.identity_keys[i]) {
 701                         key_free(options.identity_keys[i]);
 702                         options.identity_keys[i] = NULL;
 703                 }
 704         }
 705
 706         exit_status = compat20 ? ssh_session2() : ssh_session();
 707         packet_close();
 708
 709         if (options.control_path != NULL && control_fd != -1)
 710                 unlink(options.control_path);
 711
 712         /*
 713          * Send SIGHUP to proxy command if used. We don't wait() in
 714          * case it hangs and instead rely on init to reap the child
 715          */
 716         if (proxy_command_pid > 1)
 717                 kill(proxy_command_pid, SIGHUP);
 718
 719         return exit_status;
 720 }
 721
 722 #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
 723
 724 static void
 725 x11_get_proto(char **_proto, char **_data)
 726 {
 727         char cmd[1024];
 728         char line[512];
 729         char xdisplay[512];
 730         static char proto[512], data[512];
 731         FILE *f;
 732         int got_data = 0, generated = 0, do_unlink = 0, i;
 733         char *display, *xauthdir, *xauthfile;
 734         struct stat st;
 735
 736         xauthdir = xauthfile = NULL;
 737         *_proto = proto;
 738         *_data = data;
 739         proto[0] = data[0] = '\0';
 740
 741         if (!options.xauth_location ||
 742             (stat(options.xauth_location, &st) == -1)) {
 743                 debug("No xauth program.");
 744         } else {
 745                 if ((display = getenv("DISPLAY")) == NULL) {
 746                         debug("x11_get_proto: DISPLAY not set");
 747                         return;
 748                 }
 749                 /*
 750                  * Handle FamilyLocal case where $DISPLAY does
 751                  * not match an authorization entry.  For this we
 752                  * just try "xauth list unix:displaynum.screennum".
 753                  * XXX: "localhost" match to determine FamilyLocal
 754                  *      is not perfect.
 755                  */
 756                 if (strncmp(display, "localhost:", 10) == 0) {
 757                         snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
 758                             display + 10);
 759                         display = xdisplay;
 760                 }
 761                 if (options.forward_x11_trusted == 0) {
 762                         xauthdir = xmalloc(MAXPATHLEN);
 763                         xauthfile = xmalloc(MAXPATHLEN);
 764                         strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN);
 765                         if (mkdtemp(xauthdir) != NULL) {
 766                                 do_unlink = 1;
 767                                 snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile",
 768                                     xauthdir);
 769                                 snprintf(cmd, sizeof(cmd),
 770                                     "%s -f %s generate %s " SSH_X11_PROTO
 771                                     " untrusted timeout 1200 2>" _PATH_DEVNULL,
 772                                     options.xauth_location, xauthfile, display);
 773                                 debug2("x11_get_proto: %s", cmd);
 774                                 if (system(cmd) == 0)
 775                                         generated = 1;
 776                         }
 777                 }
 778                 snprintf(cmd, sizeof(cmd),
 779                     "%s %s%s list %s . 2>" _PATH_DEVNULL,
 780                     options.xauth_location,
 781                     generated ? "-f " : "" ,
 782                     generated ? xauthfile : "",
 783                     display);
 784                 debug2("x11_get_proto: %s", cmd);
 785                 f = popen(cmd, "r");
 786                 if (f && fgets(line, sizeof(line), f) &&
 787                     sscanf(line, "%*s %511s %511s", proto, data) == 2)
 788                         got_data = 1;
 789                 if (f)
 790                         pclose(f);
 791         }
 792
 793         if (do_unlink) {
 794                 unlink(xauthfile);
 795                 rmdir(xauthdir);
 796         }
 797         if (xauthdir)
 798                 xfree(xauthdir);
 799         if (xauthfile)
 800                 xfree(xauthfile);
 801
 802         /*
 803          * If we didn't get authentication data, just make up some
 804          * data.  The forwarding code will check the validity of the
 805          * response anyway, and substitute this data.  The X11
 806          * server, however, will ignore this fake data and use
 807          * whatever authentication mechanisms it was using otherwise
 808          * for the local connection.
 809          */
 810         if (!got_data) {
 811                 u_int32_t rand = 0;
 812
 813                 logit("Warning: No xauth data; "
 814                     "using fake authentication data for X11 forwarding.");
 815                 strlcpy(proto, SSH_X11_PROTO, sizeof proto);
 816                 for (i = 0; i < 16; i++) {
 817                         if (i % 4 == 0)
 818                                 rand = arc4random();
 819                         snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
 820                             rand & 0xff);
 821                         rand >>= 8;
 822                 }
 823         }
 824 }
 825
 826 static void
 827 ssh_init_forwarding(void)
 828 {
 829         int success = 0;
 830         int i;
 831
 832         /* Initiate local TCP/IP port forwardings. */
 833         for (i = 0; i < options.num_local_forwards; i++) {
 834                 debug("Connections to local port %d forwarded to remote address %.200s:%d",
 835                     options.local_forwards[i].port,
 836                     options.local_forwards[i].host,
 837                     options.local_forwards[i].host_port);
 838                 success += channel_setup_local_fwd_listener(
 839                     options.local_forwards[i].port,
 840                     options.local_forwards[i].host,
 841                     options.local_forwards[i].host_port,
 842                     options.gateway_ports);
 843         }
 844         if (i > 0 && success == 0)
 845                 error("Could not request local forwarding.");
 846
 847         /* Initiate remote TCP/IP port forwardings. */
 848         for (i = 0; i < options.num_remote_forwards; i++) {
 849                 debug("Connections to remote port %d forwarded to local address %.200s:%d",
 850                     options.remote_forwards[i].port,
 851                     options.remote_forwards[i].host,
 852                     options.remote_forwards[i].host_port);
 853                 channel_request_remote_forwarding(
 854                     options.remote_forwards[i].port,
 855                     options.remote_forwards[i].host,
 856                     options.remote_forwards[i].host_port);
 857         }
 858 }
 859
 860 static void
 861 check_agent_present(void)
 862 {
 863         if (options.forward_agent) {
 864                 /* Clear agent forwarding if we don\'t have an agent. */
 865                 if (!ssh_agent_present())
 866                         options.forward_agent = 0;
 867         }
 868 }
 869
 870 static int
 871 ssh_session(void)
 872 {
 873         int type;
 874         int interactive = 0;
 875         int have_tty = 0;
 876         struct winsize ws;
 877         char *cp;
 878
 879         /* Enable compression if requested. */
 880         if (options.compression) {
 881                 debug("Requesting compression at level %d.", options.compression_level);
 882
 883                 if (options.compression_level < 1 || options.compression_level > 9)
 884                         fatal("Compression level must be from 1 (fast) to 9 (slow, best).");
 885
 886                 /* Send the request. */
 887                 packet_start(SSH_CMSG_REQUEST_COMPRESSION);
 888                 packet_put_int(options.compression_level);
 889                 packet_send();
 890                 packet_write_wait();
 891                 type = packet_read();
 892                 if (type == SSH_SMSG_SUCCESS)
 893                         packet_start_compression(options.compression_level);
 894                 else if (type == SSH_SMSG_FAILURE)
 895                         logit("Warning: Remote host refused compression.");
 896                 else
 897                         packet_disconnect("Protocol error waiting for compression response.");
 898         }
 899         /* Allocate a pseudo tty if appropriate. */
 900         if (tty_flag) {
 901                 debug("Requesting pty.");
 902
 903                 /* Start the packet. */
 904                 packet_start(SSH_CMSG_REQUEST_PTY);
 905
 906                 /* Store TERM in the packet.  There is no limit on the
 907                    length of the string. */
 908                 cp = getenv("TERM");
 909                 if (!cp)
 910                         cp = "";
 911                 packet_put_cstring(cp);
 912
 913                 /* Store window size in the packet. */
 914                 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
 915                         memset(&ws, 0, sizeof(ws));
 916                 packet_put_int(ws.ws_row);
 917                 packet_put_int(ws.ws_col);
 918                 packet_put_int(ws.ws_xpixel);
 919                 packet_put_int(ws.ws_ypixel);
 920
 921                 /* Store tty modes in the packet. */
 922                 tty_make_modes(fileno(stdin), NULL);
 923
 924                 /* Send the packet, and wait for it to leave. */
 925                 packet_send();
 926                 packet_write_wait();
 927
 928                 /* Read response from the server. */
 929                 type = packet_read();
 930                 if (type == SSH_SMSG_SUCCESS) {
 931                         interactive = 1;
 932                         have_tty = 1;
 933                 } else if (type == SSH_SMSG_FAILURE)
 934                         logit("Warning: Remote host failed or refused to allocate a pseudo tty.");
 935                 else
 936                         packet_disconnect("Protocol error waiting for pty request response.");
 937         }
 938         /* Request X11 forwarding if enabled and DISPLAY is set. */
 939         if (options.forward_x11 && getenv("DISPLAY") != NULL) {
 940                 char *proto, *data;
 941                 /* Get reasonable local authentication information. */
 942                 x11_get_proto(&proto, &data);
 943                 /* Request forwarding with authentication spoofing. */
 944                 debug("Requesting X11 forwarding with authentication spoofing.");
 945                 x11_request_forwarding_with_spoofing(0, proto, data);
 946
 947                 /* Read response from the server. */
 948                 type = packet_read();
 949                 if (type == SSH_SMSG_SUCCESS) {
 950                         interactive = 1;
 951                 } else if (type == SSH_SMSG_FAILURE) {
 952                         logit("Warning: Remote host denied X11 forwarding.");
 953                 } else {
 954                         packet_disconnect("Protocol error waiting for X11 forwarding");
 955                 }
 956         }
 957         /* Tell the packet module whether this is an interactive session. */
 958         packet_set_interactive(interactive);
 959
 960         /* Request authentication agent forwarding if appropriate. */
 961         check_agent_present();
 962
 963         if (options.forward_agent) {
 964                 debug("Requesting authentication agent forwarding.");
 965                 auth_request_forwarding();
 966
 967                 /* Read response from the server. */
 968                 type = packet_read();
 969                 packet_check_eom();
 970                 if (type != SSH_SMSG_SUCCESS)
 971                         logit("Warning: Remote host denied authentication agent forwarding.");
 972         }
 973
 974         /* Initiate port forwardings. */
 975         ssh_init_forwarding();
 976
 977         /* If requested, let ssh continue in the background. */
 978         if (fork_after_authentication_flag)
 979                 if (daemon(1, 1) < 0)
 980                         fatal("daemon() failed: %.200s", strerror(errno));
 981
 982         /*
 983          * If a command was specified on the command line, execute the
 984          * command now. Otherwise request the server to start a shell.
 985          */
 986         if (buffer_len(&command) > 0) {
 987                 int len = buffer_len(&command);
 988                 if (len > 900)
 989                         len = 900;
 990                 debug("Sending command: %.*s", len, (u_char *)buffer_ptr(&command));
 991                 packet_start(SSH_CMSG_EXEC_CMD);
 992                 packet_put_string(buffer_ptr(&command), buffer_len(&command));
 993                 packet_send();
 994                 packet_write_wait();
 995         } else {
 996                 debug("Requesting shell.");
 997                 packet_start(SSH_CMSG_EXEC_SHELL);
 998                 packet_send();
 999                 packet_write_wait();
1000         }
1001
1002         /* Enter the interactive session. */
1003         return client_loop(have_tty, tty_flag ?
1004             options.escape_char : SSH_ESCAPECHAR_NONE, 0);
1005 }
1006
1007 static void
1008 ssh_subsystem_reply(int type, u_int32_t seq, void *ctxt)
1009 {
1010         int id, len;
1011
1012         id = packet_get_int();
1013         len = buffer_len(&command);
1014         if (len > 900)
1015                 len = 900;
1016         packet_check_eom();
1017         if (type == SSH2_MSG_CHANNEL_FAILURE)
1018                 fatal("Request for subsystem '%.*s' failed on channel %d",
1019                     len, (u_char *)buffer_ptr(&command), id);
1020 }
1021
1022 void
1023 client_global_request_reply_fwd(int type, u_int32_t seq, void *ctxt)
1024 {
1025         int i;
1026
1027         i = client_global_request_id++;
1028         if (i >= options.num_remote_forwards)
1029                 return;
1030         debug("remote forward %s for: listen %d, connect %s:%d",
1031             type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
1032             options.remote_forwards[i].port,
1033             options.remote_forwards[i].host,
1034             options.remote_forwards[i].host_port);
1035         if (type == SSH2_MSG_REQUEST_FAILURE)
1036                 logit("Warning: remote port forwarding failed for listen port %d",
1037                     options.remote_forwards[i].port);
1038 }
1039
1040 static void
1041 ssh_control_listener(void)
1042 {
1043         struct sockaddr_un addr;
1044         mode_t old_umask;
1045         int addr_len;
1046
1047         if (options.control_path == NULL || options.control_master != 1)
1048                 return;
1049
1050         memset(&addr, '\0', sizeof(addr));
1051         addr.sun_family = AF_UNIX;
1052         addr_len = offsetof(struct sockaddr_un, sun_path) +
1053             strlen(options.control_path) + 1;
1054
1055         if (strlcpy(addr.sun_path, options.control_path,
1056             sizeof(addr.sun_path)) >= sizeof(addr.sun_path))
1057                 fatal("ControlPath too long");
1058
1059         if ((control_fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0)
1060                 fatal("%s socket(): %s\n", __func__, strerror(errno));
1061
1062         old_umask = umask(0177);
1063         if (bind(control_fd, (struct sockaddr*)&addr, addr_len) == -1) {
1064                 control_fd = -1;
1065                 if (errno == EINVAL)
1066                         fatal("ControlSocket %s already exists",
1067                             options.control_path);
1068                 else
1069                         fatal("%s bind(): %s\n", __func__, strerror(errno));
1070         }
1071         umask(old_umask);
1072
1073         if (listen(control_fd, 64) == -1)
1074                 fatal("%s listen(): %s\n", __func__, strerror(errno));
1075
1076         set_nonblock(control_fd);
1077 }
1078
1079 /* request pty/x11/agent/tcpfwd/shell for channel */
1080 static void
1081 ssh_session2_setup(int id, void *arg)
1082 {
1083         int interactive = tty_flag;
1084         if (options.forward_x11 && getenv("DISPLAY") != NULL) {
1085                 char *proto, *data;
1086                 /* Get reasonable local authentication information. */
1087                 x11_get_proto(&proto, &data);
1088                 /* Request forwarding with authentication spoofing. */
1089                 debug("Requesting X11 forwarding with authentication spoofing.");
1090                 x11_request_forwarding_with_spoofing(id, proto, data);
1091                 interactive = 1;
1092                 /* XXX wait for reply */
1093         }
1094
1095         check_agent_present();
1096         if (options.forward_agent) {
1097                 debug("Requesting authentication agent forwarding.");
1098                 channel_request_start(id, "auth-agent-req@openssh.com", 0);
1099                 packet_send();
1100         }
1101
1102         client_session2_setup(id, tty_flag, subsystem_flag, getenv("TERM"),
1103             NULL, fileno(stdin), &command, &ssh_subsystem_reply);
1104
1105         packet_set_interactive(interactive);
1106 }
1107
1108 /* open new channel for a session */
1109 static int
1110 ssh_session2_open(void)
1111 {
1112         Channel *c;
1113         int window, packetmax, in, out, err;
1114
1115         if (stdin_null_flag) {
1116                 in = open(_PATH_DEVNULL, O_RDONLY);
1117         } else {
1118                 in = dup(STDIN_FILENO);
1119         }
1120         out = dup(STDOUT_FILENO);
1121         err = dup(STDERR_FILENO);
1122
1123         if (in < 0 || out < 0 || err < 0)
1124                 fatal("dup() in/out/err failed");
1125
1126         /* enable nonblocking unless tty */
1127         if (!isatty(in))
1128                 set_nonblock(in);
1129         if (!isatty(out))
1130                 set_nonblock(out);
1131         if (!isatty(err))
1132                 set_nonblock(err);
1133
1134         window = CHAN_SES_WINDOW_DEFAULT;
1135         packetmax = CHAN_SES_PACKET_DEFAULT;
1136         if (tty_flag) {
1137                 window >>= 1;
1138                 packetmax >>= 1;
1139         }
1140         c = channel_new(
1141             "session", SSH_CHANNEL_OPENING, in, out, err,
1142             window, packetmax, CHAN_EXTENDED_WRITE,
1143             "client-session", /*nonblock*/0);
1144
1145         debug3("ssh_session2_open: channel_new: %d", c->self);
1146
1147         channel_send_open(c->self);
1148         if (!no_shell_flag)
1149                 channel_register_confirm(c->self, ssh_session2_setup, NULL);
1150
1151         return c->self;
1152 }
1153
1154 static int
1155 ssh_session2(void)
1156 {
1157         int id = -1;
1158
1159         /* XXX should be pre-session */
1160         ssh_init_forwarding();
1161         ssh_control_listener();
1162
1163         if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN))
1164                 id = ssh_session2_open();
1165
1166         /* If requested, let ssh continue in the background. */
1167         if (fork_after_authentication_flag)
1168                 if (daemon(1, 1) < 0)
1169                         fatal("daemon() failed: %.200s", strerror(errno));
1170
1171         return client_loop(tty_flag, tty_flag ?
1172             options.escape_char : SSH_ESCAPECHAR_NONE, id);
1173 }
1174
1175 static void
1176 load_public_identity_files(void)
1177 {
1178         char *filename;
1179         int i = 0;
1180         Key *public;
1181 #ifdef SMARTCARD
1182         Key **keys;
1183
1184         if (options.smartcard_device != NULL &&
1185             options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
1186             (keys = sc_get_keys(options.smartcard_device, NULL)) != NULL ) {
1187                 int count = 0;
1188                 for (i = 0; keys[i] != NULL; i++) {
1189                         count++;
1190                         memmove(&options.identity_files[1], &options.identity_files[0],
1191                             sizeof(char *) * (SSH_MAX_IDENTITY_FILES - 1));
1192                         memmove(&options.identity_keys[1], &options.identity_keys[0],
1193                             sizeof(Key *) * (SSH_MAX_IDENTITY_FILES - 1));
1194                         options.num_identity_files++;
1195                         options.identity_keys[0] = keys[i];
1196                         options.identity_files[0] = sc_get_key_label(keys[i]);
1197                 }
1198                 if (options.num_identity_files > SSH_MAX_IDENTITY_FILES)
1199                         options.num_identity_files = SSH_MAX_IDENTITY_FILES;
1200                 i = count;
1201                 xfree(keys);
1202         }
1203 #endif /* SMARTCARD */
1204         for (; i < options.num_identity_files; i++) {
1205                 filename = tilde_expand_filename(options.identity_files[i],
1206                     original_real_uid);
1207                 public = key_load_public(filename, NULL);
1208                 debug("identity file %s type %d", filename,
1209                     public ? public->type : -1);
1210                 xfree(options.identity_files[i]);
1211                 options.identity_files[i] = filename;
1212                 options.identity_keys[i] = public;
1213         }
1214 }
1215
1216 static void
1217 control_client_sighandler(int signo)
1218 {
1219         control_client_terminate = signo;
1220 }
1221
1222 static void
1223 control_client_sigrelay(int signo)
1224 {
1225         if (control_server_pid > 1)
1226                 kill(control_server_pid, signo);
1227 }
1228
1229 static void
1230 control_client(const char *path)
1231 {
1232         struct sockaddr_un addr;
1233         int r, sock, exitval, addr_len;
1234         Buffer m;
1235         char *cp;
1236
1237         memset(&addr, '\0', sizeof(addr));
1238         addr.sun_family = AF_UNIX;
1239         addr_len = offsetof(struct sockaddr_un, sun_path) +
1240             strlen(path) + 1;
1241
1242         if (strlcpy(addr.sun_path, path,
1243             sizeof(addr.sun_path)) >= sizeof(addr.sun_path))
1244                 fatal("ControlPath too long");
1245
1246         if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) < 0)
1247                 fatal("%s socket(): %s", __func__, strerror(errno));
1248
1249         if (connect(sock, (struct sockaddr*)&addr, addr_len) == -1)
1250                 fatal("Couldn't connect to %s: %s", path, strerror(errno));
1251
1252         if ((cp = getenv("TERM")) == NULL)
1253                 cp = "";
1254
1255         signal(SIGINT, control_client_sighandler);
1256         signal(SIGTERM, control_client_sighandler);
1257         signal(SIGWINCH, control_client_sigrelay);
1258
1259         buffer_init(&m);
1260
1261         /* Get PID of controlee */
1262         if (ssh_msg_recv(sock, &m) == -1)
1263                 fatal("%s: msg_recv", __func__);
1264         if (buffer_get_char(&m) != 0)
1265                 fatal("%s: wrong version", __func__);
1266         control_server_pid = buffer_get_int(&m);
1267
1268         /* XXX: env passing */
1269
1270         buffer_clear(&m);
1271         buffer_put_int(&m, tty_flag);
1272         buffer_put_int(&m, subsystem_flag);
1273         buffer_put_cstring(&m, cp);
1274
1275         buffer_append(&command, "\0", 1);
1276         buffer_put_cstring(&m, buffer_ptr(&command));
1277
1278         if (ssh_msg_send(sock, /* version */0, &m) == -1)
1279                 fatal("%s: msg_send", __func__);
1280
1281         mm_send_fd(sock, STDIN_FILENO);
1282         mm_send_fd(sock, STDOUT_FILENO);
1283         mm_send_fd(sock, STDERR_FILENO);
1284
1285         /* Wait for reply, so master has a chance to gather ttymodes */
1286         buffer_clear(&m);
1287         if (ssh_msg_recv(sock, &m) == -1)
1288                 fatal("%s: msg_recv", __func__);
1289         if (buffer_get_char(&m) != 0)
1290                 fatal("%s: master returned error", __func__);
1291         buffer_free(&m);
1292
1293         if (tty_flag)
1294                 enter_raw_mode();
1295
1296         /* Stick around until the controlee closes the client_fd */
1297         exitval = 0;
1298         for (;!control_client_terminate;) {
1299                 r = read(sock, &exitval, sizeof(exitval));
1300                 if (r == 0) {
1301                         debug2("Received EOF from master");
1302                         break;
1303                 }
1304                 if (r > 0)
1305                         debug2("Received exit status from master %d", exitval);
1306                 if (r == -1 && errno != EINTR)
1307                         fatal("%s: read %s", __func__, strerror(errno));
1308         }
1309
1310         if (control_client_terminate)
1311                 debug2("Exiting on signal %d", control_client_terminate);
1312
1313         close(sock);
1314
1315         leave_raw_mode();
1316
1317         if (tty_flag && options.log_level != SYSLOG_LEVEL_QUIET)
1318                 fprintf(stderr, "Connection to master closed.\r\n");
1319
1320         exit(exitval);
1321 }