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