openssh/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 1.206 2003/12/16 15:49:51 markus 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 "channels.h"
  57 #include "key.h"
  58 #include "authfd.h"
  59 #include "authfile.h"
  60 #include "pathnames.h"
  61 #include "clientloop.h"
  62 #include "log.h"
  63 #include "readconf.h"
  64 #include "sshconnect.h"
  65 #include "tildexpand.h"
  66 #include "dispatch.h"
  67 #include "misc.h"
  68 #include "kex.h"
  69 #include "mac.h"
  70 #include "sshtty.h"
  71
  72 #ifdef SMARTCARD
  73 #include "scard.h"
  74 #endif
  75
  76 #ifdef HAVE___PROGNAME
  77 extern char *__progname;
  78 #else
  79 char *__progname;
  80 #endif
  81
  82 /* Flag indicating whether debug mode is on.  This can be set on the command line. */
  83 int debug_flag = 0;
  84
  85 /* Flag indicating whether a tty should be allocated */
  86 int tty_flag = 0;
  87 int no_tty_flag = 0;
  88 int force_tty_flag = 0;
  89
  90 /* don't exec a shell */
  91 int no_shell_flag = 0;
  92
  93 /*
  94  * Flag indicating that nothing should be read from stdin.  This can be set
  95  * on the command line.
  96  */
  97 int stdin_null_flag = 0;
  98
  99 /*
 100  * Flag indicating that ssh should fork after authentication.  This is useful
 101  * so that the passphrase can be entered manually, and then ssh goes to the
 102  * background.
 103  */
 104 int fork_after_authentication_flag = 0;
 105
 106 /*
 107  * General data structure for command line options and options configurable
 108  * in configuration files.  See readconf.h.
 109  */
 110 Options options;
 111
 112 /* optional user configfile */
 113 char *config = NULL;
 114
 115 /*
 116  * Name of the host we are connecting to.  This is the name given on the
 117  * command line, or the HostName specified for the user-supplied name in a
 118  * configuration file.
 119  */
 120 char *host;
 121
 122 /* socket address the host resolves to */
 123 struct sockaddr_storage hostaddr;
 124
 125 /* Private host keys. */
 126 Sensitive sensitive_data;
 127
 128 /* Original real UID. */
 129 uid_t original_real_uid;
 130 uid_t original_effective_uid;
 131
 132 /* command to be executed */
 133 Buffer command;
 134
 135 /* Should we execute a command or invoke a subsystem? */
 136 int subsystem_flag = 0;
 137
 138 /* # of replies received for global requests */
 139 static int client_global_request_id = 0;
 140
 141 /* pid of proxycommand child process */
 142 pid_t proxy_command_pid = 0;
 143
 144 /* Prints a help message to the user.  This function never returns. */
 145
 146 static void
 147 usage(void)
 148 {
 149         fprintf(stderr, "Usage: %s [options] host [command]\n", __progname);
 150         fprintf(stderr, "Options:\n");
 151         fprintf(stderr, "  -l user     Log in using this user name.\n");
 152         fprintf(stderr, "  -n          Redirect input from " _PATH_DEVNULL ".\n");
 153         fprintf(stderr, "  -F config   Config file (default: ~/%s).\n",
 154              _PATH_SSH_USER_CONFFILE);
 155         fprintf(stderr, "  -A          Enable authentication agent forwarding.\n");
 156         fprintf(stderr, "  -a          Disable authentication agent forwarding (default).\n");
 157         fprintf(stderr, "  -X          Enable X11 connection forwarding.\n");
 158         fprintf(stderr, "  -Y          Enable trusted X11 connection forwarding.\n");
 159         fprintf(stderr, "  -x          Disable X11 connection forwarding (default).\n");
 160         fprintf(stderr, "  -i file     Identity for public key authentication "
 161             "(default: ~/.ssh/identity)\n");
 162 #ifdef SMARTCARD
 163         fprintf(stderr, "  -I reader   Set smartcard reader.\n");
 164 #endif
 165         fprintf(stderr, "  -t          Tty; allocate a tty even if command is given.\n");
 166         fprintf(stderr, "  -T          Do not allocate a tty.\n");
 167         fprintf(stderr, "  -v          Verbose; display verbose debugging messages.\n");
 168         fprintf(stderr, "              Multiple -v increases verbosity.\n");
 169         fprintf(stderr, "  -V          Display version number only.\n");
 170         fprintf(stderr, "  -q          Quiet; don't display any warning messages.\n");
 171         fprintf(stderr, "  -f          Fork into background after authentication.\n");
 172         fprintf(stderr, "  -e char     Set escape character; ``none'' = disable (default: ~).\n");
 173
 174         fprintf(stderr, "  -c cipher   Select encryption algorithm\n");
 175         fprintf(stderr, "  -m macs     Specify MAC algorithms for protocol version 2.\n");
 176         fprintf(stderr, "  -p port     Connect to this port.  Server must be on the same port.\n");
 177         fprintf(stderr, "  -L listen-port:host:port   Forward local port to remote address\n");
 178         fprintf(stderr, "  -R listen-port:host:port   Forward remote port to local address\n");
 179         fprintf(stderr, "              These cause %s to listen for connections on a port, and\n", __progname);
 180         fprintf(stderr, "              forward them to the other side by connecting to host:port.\n");
 181         fprintf(stderr, "  -D port     Enable dynamic application-level port forwarding.\n");
 182         fprintf(stderr, "  -C          Enable compression.\n");
 183         fprintf(stderr, "  -N          Do not execute a shell or command.\n");
 184         fprintf(stderr, "  -g          Allow remote hosts to connect to forwarded ports.\n");
 185         fprintf(stderr, "  -1          Force protocol version 1.\n");
 186         fprintf(stderr, "  -2          Force protocol version 2.\n");
 187         fprintf(stderr, "  -4          Use IPv4 only.\n");
 188         fprintf(stderr, "  -6          Use IPv6 only.\n");
 189         fprintf(stderr, "  -o 'option' Process the option as if it was read from a configuration file.\n");
 190         fprintf(stderr, "  -s          Invoke command (mandatory) as SSH2 subsystem.\n");
 191         fprintf(stderr, "  -b addr     Local IP address.\n");
 192         exit(1);
 193 }
 194
 195 static int ssh_session(void);
 196 static int ssh_session2(void);
 197 static void load_public_identity_files(void);
 198
 199 /*
 200  * Main program for the ssh client.
 201  */
 202 int
 203 main(int ac, char **av)
 204 {
 205         int i, opt, exit_status;
 206         u_short fwd_port, fwd_host_port;
 207         char sfwd_port[6], sfwd_host_port[6];
 208         char *p, *cp, *line, buf[256];
 209         struct stat st;
 210         struct passwd *pw;
 211         int dummy;
 212         extern int optind, optreset;
 213         extern char *optarg;
 214
 215         __progname = ssh_get_progname(av[0]);
 216         init_pathnames();
 217         init_rng();
 218
 219         /*
 220          * Save the original real uid.  It will be needed later (uid-swapping
 221          * may clobber the real uid).
 222          */
 223         original_real_uid = getuid();
 224         original_effective_uid = geteuid();
 225
 226         /*
 227          * Use uid-swapping to give up root privileges for the duration of
 228          * option processing.  We will re-instantiate the rights when we are
 229          * ready to create the privileged port, and will permanently drop
 230          * them when the port has been created (actually, when the connection
 231          * has been made, as we may need to create the port several times).
 232          */
 233         PRIV_END;
 234
 235 #ifdef HAVE_SETRLIMIT
 236         /* If we are installed setuid root be careful to not drop core. */
 237         if (original_real_uid != original_effective_uid) {
 238                 struct rlimit rlim;
 239                 rlim.rlim_cur = rlim.rlim_max = 0;
 240                 if (setrlimit(RLIMIT_CORE, &rlim) < 0)
 241                         fatal("setrlimit failed: %.100s", strerror(errno));
 242         }
 243 #endif
 244         /* Get user data. */
 245         pw = getpwuid(original_real_uid);
 246         if (!pw) {
 247                 logit("You don't exist, go away!");
 248                 exit(1);
 249         }
 250         /* Take a copy of the returned structure. */
 251         pw = pwcopy(pw);
 252
 253         /*
 254          * Set our umask to something reasonable, as some files are created
 255          * with the default umask.  This will make them world-readable but
 256          * writable only by the owner, which is ok for all files for which we
 257          * don't set the modes explicitly.
 258          */
 259         umask(022);
 260
 261         /* Initialize option structure to indicate that no values have been set. */
 262         initialize_options(&options);
 263
 264         /* Parse command-line arguments. */
 265         host = NULL;
 266
 267 again:
 268         while ((opt = getopt(ac, av,
 269             "1246ab:c:e:fgi:kl:m:no:p:qstvxACD:F:I:L:NPR:TVXY")) != -1) {
 270                 switch (opt) {
 271                 case '1':
 272                         options.protocol = SSH_PROTO_1;
 273                         break;
 274                 case '2':
 275                         options.protocol = SSH_PROTO_2;
 276                         break;
 277                 case '4':
 278                         options.address_family = AF_INET;
 279                         break;
 280                 case '6':
 281                         options.address_family = AF_INET6;
 282                         break;
 283                 case 'n':
 284                         stdin_null_flag = 1;
 285                         break;
 286                 case 'f':
 287                         fork_after_authentication_flag = 1;
 288                         stdin_null_flag = 1;
 289                         break;
 290                 case 'x':
 291                         options.forward_x11 = 0;
 292                         break;
 293                 case 'X':
 294                         options.forward_x11 = 1;
 295                         break;
 296                 case 'Y':
 297                         options.forward_x11 = 1;
 298                         options.forward_x11_trusted = 1;
 299                         break;
 300                 case 'g':
 301                         options.gateway_ports = 1;
 302                         break;
 303                 case 'P':       /* deprecated */
 304                         options.use_privileged_port = 0;
 305                         break;
 306                 case 'a':
 307                         options.forward_agent = 0;
 308                         break;
 309                 case 'A':
 310                         options.forward_agent = 1;
 311                         break;
 312                 case 'k':
 313                         options.gss_deleg_creds = 0;
 314                         break;
 315                 case 'i':
 316                         if (stat(optarg, &st) < 0) {
 317                                 fprintf(stderr, "Warning: Identity file %s "
 318                                     "does not exist.\n", optarg);
 319                                 break;
 320                         }
 321                         if (options.num_identity_files >=
 322                             SSH_MAX_IDENTITY_FILES)
 323                                 fatal("Too many identity files specified "
 324                                     "(max %d)", SSH_MAX_IDENTITY_FILES);
 325                         options.identity_files[options.num_identity_files++] =
 326                             xstrdup(optarg);
 327                         break;
 328                 case 'I':
 329 #ifdef SMARTCARD
 330                         options.smartcard_device = xstrdup(optarg);
 331 #else
 332                         fprintf(stderr, "no support for smartcards.\n");
 333 #endif
 334                         break;
 335                 case 't':
 336                         if (tty_flag)
 337                                 force_tty_flag = 1;
 338                         tty_flag = 1;
 339                         break;
 340                 case 'v':
 341                         if (debug_flag == 0) {
 342                                 debug_flag = 1;
 343                                 options.log_level = SYSLOG_LEVEL_DEBUG1;
 344                         } else {
 345                                 if (options.log_level < SYSLOG_LEVEL_DEBUG3)
 346                                         options.log_level++;
 347                                 break;
 348                         }
 349                         /* fallthrough */
 350                 case 'V':
 351                         fprintf(stderr,
 352                             "%s, SSH protocols %d.%d/%d.%d, %s\n",
 353                             SSH_VERSION,
 354                             PROTOCOL_MAJOR_1, PROTOCOL_MINOR_1,
 355                             PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2,
 356                             SSLeay_version(SSLEAY_VERSION));
 357                         if (opt == 'V')
 358                                 exit(0);
 359                         break;
 360                 case 'q':
 361                         options.log_level = SYSLOG_LEVEL_QUIET;
 362                         break;
 363                 case 'e':
 364                         if (optarg[0] == '^' && optarg[2] == 0 &&
 365                             (u_char) optarg[1] >= 64 &&
 366                             (u_char) optarg[1] < 128)
 367                                 options.escape_char = (u_char) optarg[1] & 31;
 368                         else if (strlen(optarg) == 1)
 369                                 options.escape_char = (u_char) optarg[0];
 370                         else if (strcmp(optarg, "none") == 0)
 371                                 options.escape_char = SSH_ESCAPECHAR_NONE;
 372                         else {
 373                                 fprintf(stderr, "Bad escape character '%s'.\n",
 374                                     optarg);
 375                                 exit(1);
 376                         }
 377                         break;
 378                 case 'c':
 379                         if (ciphers_valid(optarg)) {
 380                                 /* SSH2 only */
 381                                 options.ciphers = xstrdup(optarg);
 382                                 options.cipher = SSH_CIPHER_ILLEGAL;
 383                         } else {
 384                                 /* SSH1 only */
 385                                 options.cipher = cipher_number(optarg);
 386                                 if (options.cipher == -1) {
 387                                         fprintf(stderr,
 388                                             "Unknown cipher type '%s'\n",
 389                                             optarg);
 390                                         exit(1);
 391                                 }
 392                                 if (options.cipher == SSH_CIPHER_3DES)
 393                                         options.ciphers = "3des-cbc";
 394                                 else if (options.cipher == SSH_CIPHER_BLOWFISH)
 395                                         options.ciphers = "blowfish-cbc";
 396                                 else
 397                                         options.ciphers = (char *)-1;
 398                         }
 399                         break;
 400                 case 'm':
 401                         if (mac_valid(optarg))
 402                                 options.macs = xstrdup(optarg);
 403                         else {
 404                                 fprintf(stderr, "Unknown mac type '%s'\n",
 405                                     optarg);
 406                                 exit(1);
 407                         }
 408                         break;
 409                 case 'p':
 410                         options.port = a2port(optarg);
 411                         if (options.port == 0) {
 412                                 fprintf(stderr, "Bad port '%s'\n", optarg);
 413                                 exit(1);
 414                         }
 415                         break;
 416                 case 'l':
 417                         options.user = optarg;
 418                         break;
 419
 420                 case 'L':
 421                 case 'R':
 422                         if (sscanf(optarg, "%5[0123456789]:%255[^:]:%5[0123456789]",
 423                             sfwd_port, buf, sfwd_host_port) != 3 &&
 424                             sscanf(optarg, "%5[0123456789]/%255[^/]/%5[0123456789]",
 425                             sfwd_port, buf, sfwd_host_port) != 3) {
 426                                 fprintf(stderr,
 427                                     "Bad forwarding specification '%s'\n",
 428                                     optarg);
 429                                 usage();
 430                                 /* NOTREACHED */
 431                         }
 432                         if ((fwd_port = a2port(sfwd_port)) == 0 ||
 433                             (fwd_host_port = a2port(sfwd_host_port)) == 0) {
 434                                 fprintf(stderr,
 435                                     "Bad forwarding port(s) '%s'\n", optarg);
 436                                 exit(1);
 437                         }
 438                         if (opt == 'L')
 439                                 add_local_forward(&options, fwd_port, buf,
 440                                     fwd_host_port);
 441                         else if (opt == 'R')
 442                                 add_remote_forward(&options, fwd_port, buf,
 443                                     fwd_host_port);
 444                         break;
 445
 446                 case 'D':
 447                         fwd_port = a2port(optarg);
 448                         if (fwd_port == 0) {
 449                                 fprintf(stderr, "Bad dynamic port '%s'\n",
 450                                     optarg);
 451                                 exit(1);
 452                         }
 453                         add_local_forward(&options, fwd_port, "socks", 0);
 454                         break;
 455
 456                 case 'C':
 457                         options.compression = 1;
 458                         break;
 459                 case 'N':
 460                         no_shell_flag = 1;
 461                         no_tty_flag = 1;
 462                         break;
 463                 case 'T':
 464                         no_tty_flag = 1;
 465                         break;
 466                 case 'o':
 467                         dummy = 1;
 468                         line = xstrdup(optarg);
 469                         if (process_config_line(&options, host ? host : "",
 470                             line, "command-line", 0, &dummy) != 0)
 471                                 exit(1);
 472                         xfree(line);
 473                         break;
 474                 case 's':
 475                         subsystem_flag = 1;
 476                         break;
 477                 case 'b':
 478                         options.bind_address = optarg;
 479                         break;
 480                 case 'F':
 481                         config = optarg;
 482                         break;
 483                 default:
 484                         usage();
 485                 }
 486         }
 487
 488         ac -= optind;
 489         av += optind;
 490
 491         if (ac > 0 && !host && **av != '-') {
 492                 if (strrchr(*av, '@')) {
 493                         p = xstrdup(*av);
 494                         cp = strrchr(p, '@');
 495                         if (cp == NULL || cp == p)
 496                                 usage();
 497                         options.user = p;
 498                         *cp = '\0';
 499                         host = ++cp;
 500                 } else
 501                         host = *av;
 502                 if (ac > 1) {
 503                         optind = optreset = 1;
 504                         goto again;
 505                 }
 506                 ac--, av++;
 507         }
 508
 509         /* Check that we got a host name. */
 510         if (!host)
 511                 usage();
 512
 513         SSLeay_add_all_algorithms();
 514         ERR_load_crypto_strings();
 515
 516         /* Initialize the command to execute on remote host. */
 517         buffer_init(&command);
 518
 519         /*
 520          * Save the command to execute on the remote host in a buffer. There
 521          * is no limit on the length of the command, except by the maximum
 522          * packet size.  Also sets the tty flag if there is no command.
 523          */
 524         if (!ac) {
 525                 /* No command specified - execute shell on a tty. */
 526                 tty_flag = 1;
 527                 if (subsystem_flag) {
 528                         fprintf(stderr,
 529                             "You must specify a subsystem to invoke.\n");
 530                         usage();
 531                 }
 532         } else {
 533                 /* A command has been specified.  Store it into the buffer. */
 534                 for (i = 0; i < ac; i++) {
 535                         if (i)
 536                                 buffer_append(&command, " ", 1);
 537                         buffer_append(&command, av[i], strlen(av[i]));
 538                 }
 539         }
 540
 541         /* Cannot fork to background if no command. */
 542         if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag)
 543                 fatal("Cannot fork into background without a command to execute.");
 544
 545         /* Allocate a tty by default if no command specified. */
 546         if (buffer_len(&command) == 0)
 547                 tty_flag = 1;
 548
 549         /* Force no tty */
 550         if (no_tty_flag)
 551                 tty_flag = 0;
 552         /* Do not allocate a tty if stdin is not a tty. */
 553         if (!isatty(fileno(stdin)) && !force_tty_flag) {
 554                 if (tty_flag)
 555                         logit("Pseudo-terminal will not be allocated because stdin is not a terminal.");
 556                 tty_flag = 0;
 557         }
 558
 559         /*
 560          * Initialize "log" output.  Since we are the client all output
 561          * actually goes to stderr.
 562          */
 563         log_init(av[0], options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level,
 564             SYSLOG_FACILITY_USER, 1);
 565
 566         /*
 567          * Read per-user configuration file.  Ignore the system wide config
 568          * file if the user specifies a config file on the command line.
 569          */
 570         if (config != NULL) {
 571                 if (!read_config_file(config, host, &options))
 572                         fatal("Can't open user config file %.100s: "
 573                             "%.100s", config, strerror(errno));
 574         } else  {
 575             /*
 576              * Since the config file parsing code aborts if it sees
 577              * options it doesn't recognize, allow users to put
 578              * options specific to compile-time add-ons in alternate
 579              * config files so their primary config file will
 580              * interoperate SSH versions that don't support those
 581              * options.
 582              */
 583 #ifdef GSSAPI
 584                 snprintf(buf, sizeof buf, "%.100s/%.100s.gssapi", pw->pw_dir,
 585                     _PATH_SSH_USER_CONFFILE);
 586                 (void)read_config_file(buf, host, &options);
 587 #ifdef GSI
 588                 snprintf(buf, sizeof buf, "%.100s/%.100s.gsi", pw->pw_dir,
 589                     _PATH_SSH_USER_CONFFILE);
 590                 (void)read_config_file(buf, host, &options);
 591 #endif
 592 #if defined(KRB5)
 593                 snprintf(buf, sizeof buf, "%.100s/%.100s.krb", pw->pw_dir,
 594                     _PATH_SSH_USER_CONFFILE);
 595                 (void)read_config_file(buf, host, &options);
 596 #endif
 597 #endif
 598                 snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir,
 599                     _PATH_SSH_USER_CONFFILE);
 600                 (void)read_config_file(buf, host, &options);
 601
 602                 /* Read systemwide configuration file after use config. */
 603                 (void)read_config_file(_PATH_HOST_CONFIG_FILE, host, &options);
 604         }
 605
 606         /* Fill configuration defaults. */
 607         fill_default_options(&options);
 608
 609         channel_set_af(options.address_family);
 610
 611         /* reinit */
 612         log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 1);
 613
 614         seed_rng();
 615
 616         if (options.user == NULL) {
 617                 options.user = xstrdup(pw->pw_name);
 618                 options.implicit = 1;
 619         }
 620         else options.implicit = 0;
 621
 622         if (options.hostname != NULL)
 623                 host = options.hostname;
 624
 625         /* force lowercase for hostkey matching */
 626         if (options.host_key_alias != NULL) {
 627                 for (p = options.host_key_alias; *p; p++)
 628                         if (isupper(*p))
 629                                 *p = tolower(*p);
 630         }
 631
 632         if (options.proxy_command != NULL &&
 633             strcmp(options.proxy_command, "none") == 0)
 634                 options.proxy_command = NULL;
 635
 636         /* Open a connection to the remote host. */
 637         if (ssh_connect(host, &hostaddr, options.port,
 638             options.address_family, options.connection_attempts,
 639 #ifdef HAVE_CYGWIN
 640             options.use_privileged_port,
 641 #else
 642             original_effective_uid == 0 && options.use_privileged_port,
 643 #endif
 644             options.proxy_command) != 0)
 645                 exit(1);
 646
 647         /*
 648          * If we successfully made the connection, load the host private key
 649          * in case we will need it later for combined rsa-rhosts
 650          * authentication. This must be done before releasing extra
 651          * privileges, because the file is only readable by root.
 652          * If we cannot access the private keys, load the public keys
 653          * instead and try to execute the ssh-keysign helper instead.
 654          */
 655         sensitive_data.nkeys = 0;
 656         sensitive_data.keys = NULL;
 657         sensitive_data.external_keysign = 0;
 658         if (options.rhosts_rsa_authentication ||
 659             options.hostbased_authentication) {
 660                 sensitive_data.nkeys = 3;
 661                 sensitive_data.keys = xmalloc(sensitive_data.nkeys *
 662                     sizeof(Key));
 663
 664                 PRIV_START;
 665                 sensitive_data.keys[0] = key_load_private_type(KEY_RSA1,
 666                     _PATH_HOST_KEY_FILE, "", NULL);
 667                 sensitive_data.keys[1] = key_load_private_type(KEY_DSA,
 668                     _PATH_HOST_DSA_KEY_FILE, "", NULL);
 669                 sensitive_data.keys[2] = key_load_private_type(KEY_RSA,
 670                     _PATH_HOST_RSA_KEY_FILE, "", NULL);
 671                 PRIV_END;
 672
 673                 if (options.hostbased_authentication == 1 &&
 674                     sensitive_data.keys[0] == NULL &&
 675                     sensitive_data.keys[1] == NULL &&
 676                     sensitive_data.keys[2] == NULL) {
 677                         sensitive_data.keys[1] = key_load_public(
 678                             _PATH_HOST_DSA_KEY_FILE, NULL);
 679                         sensitive_data.keys[2] = key_load_public(
 680                             _PATH_HOST_RSA_KEY_FILE, NULL);
 681                         sensitive_data.external_keysign = 1;
 682                 }
 683         }
 684         /*
 685          * Get rid of any extra privileges that we may have.  We will no
 686          * longer need them.  Also, extra privileges could make it very hard
 687          * to read identity files and other non-world-readable files from the
 688          * user's home directory if it happens to be on a NFS volume where
 689          * root is mapped to nobody.
 690          */
 691         seteuid(original_real_uid);
 692         setuid(original_real_uid);
 693
 694         /*
 695          * Now that we are back to our own permissions, create ~/.ssh
 696          * directory if it doesn\'t already exist.
 697          */
 698         snprintf(buf, sizeof buf, "%.100s%s%.100s", pw->pw_dir, strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR);
 699         if (stat(buf, &st) < 0)
 700                 if (mkdir(buf, 0700) < 0)
 701                         error("Could not create directory '%.200s'.", buf);
 702
 703         /* load options.identity_files */
 704         load_public_identity_files();
 705
 706         /* Expand ~ in known host file names. */
 707         /* XXX mem-leaks: */
 708         options.system_hostfile =
 709             tilde_expand_filename(options.system_hostfile, original_real_uid);
 710         options.user_hostfile =
 711             tilde_expand_filename(options.user_hostfile, original_real_uid);
 712         options.system_hostfile2 =
 713             tilde_expand_filename(options.system_hostfile2, original_real_uid);
 714         options.user_hostfile2 =
 715             tilde_expand_filename(options.user_hostfile2, original_real_uid);
 716
 717         signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
 718
 719         /* Log into the remote system.  This never returns if the login fails. */
 720         ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr, pw);
 721
 722         /* We no longer need the private host keys.  Clear them now. */
 723         if (sensitive_data.nkeys != 0) {
 724                 for (i = 0; i < sensitive_data.nkeys; i++) {
 725                         if (sensitive_data.keys[i] != NULL) {
 726                                 /* Destroys contents safely */
 727                                 debug3("clear hostkey %d", i);
 728                                 key_free(sensitive_data.keys[i]);
 729                                 sensitive_data.keys[i] = NULL;
 730                         }
 731                 }
 732                 xfree(sensitive_data.keys);
 733         }
 734         for (i = 0; i < options.num_identity_files; i++) {
 735                 if (options.identity_files[i]) {
 736                         xfree(options.identity_files[i]);
 737                         options.identity_files[i] = NULL;
 738                 }
 739                 if (options.identity_keys[i]) {
 740                         key_free(options.identity_keys[i]);
 741                         options.identity_keys[i] = NULL;
 742                 }
 743         }
 744
 745         exit_status = compat20 ? ssh_session2() : ssh_session();
 746         packet_close();
 747
 748         /*
 749          * Send SIGHUP to proxy command if used. We don't wait() in
 750          * case it hangs and instead rely on init to reap the child
 751          */
 752         if (proxy_command_pid > 1)
 753                 kill(proxy_command_pid, SIGHUP);
 754
 755         return exit_status;
 756 }
 757
 758 #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
 759
 760 static void
 761 x11_get_proto(char **_proto, char **_data)
 762 {
 763         char cmd[1024];
 764         char line[512];
 765         char xdisplay[512];
 766         static char proto[512], data[512];
 767         FILE *f;
 768         int got_data = 0, generated = 0, do_unlink = 0, i;
 769         char *display, *xauthdir, *xauthfile;
 770         struct stat st;
 771
 772         xauthdir = xauthfile = NULL;
 773         *_proto = proto;
 774         *_data = data;
 775         proto[0] = data[0] = '\0';
 776
 777         if (!options.xauth_location ||
 778             (stat(options.xauth_location, &st) == -1)) {
 779                 debug("No xauth program.");
 780         } else {
 781                 if ((display = getenv("DISPLAY")) == NULL) {
 782                         debug("x11_get_proto: DISPLAY not set");
 783                         return;
 784                 }
 785                 /*
 786                  * Handle FamilyLocal case where $DISPLAY does
 787                  * not match an authorization entry.  For this we
 788                  * just try "xauth list unix:displaynum.screennum".
 789                  * XXX: "localhost" match to determine FamilyLocal
 790                  *      is not perfect.
 791                  */
 792                 if (strncmp(display, "localhost:", 10) == 0) {
 793                         snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
 794                             display + 10);
 795                         display = xdisplay;
 796                 }
 797                 if (options.forward_x11_trusted == 0) {
 798                         xauthdir = xmalloc(MAXPATHLEN);
 799                         xauthfile = xmalloc(MAXPATHLEN);
 800                         strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN);
 801                         if (mkdtemp(xauthdir) != NULL) {
 802                                 do_unlink = 1;
 803                                 snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile",
 804                                     xauthdir);
 805                                 snprintf(cmd, sizeof(cmd),
 806                                     "%s -f %s generate %s " SSH_X11_PROTO
 807                                     " untrusted timeout 120 2>" _PATH_DEVNULL,
 808                                     options.xauth_location, xauthfile, display);
 809                                 debug2("x11_get_proto: %s", cmd);
 810                                 if (system(cmd) == 0)
 811                                         generated = 1;
 812                         }
 813                 }
 814                 snprintf(cmd, sizeof(cmd),
 815                     "%s %s%s list %s . 2>" _PATH_DEVNULL,
 816                     options.xauth_location,
 817                     generated ? "-f " : "" ,
 818                     generated ? xauthfile : "",
 819                     display);
 820                 debug2("x11_get_proto: %s", cmd);
 821                 f = popen(cmd, "r");
 822                 if (f && fgets(line, sizeof(line), f) &&
 823                     sscanf(line, "%*s %511s %511s", proto, data) == 2)
 824                         got_data = 1;
 825                 if (f)
 826                         pclose(f);
 827         }
 828
 829         if (do_unlink) {
 830                 unlink(xauthfile);
 831                 rmdir(xauthdir);
 832         }
 833         if (xauthdir)
 834                 xfree(xauthdir);
 835         if (xauthfile)
 836                 xfree(xauthfile);
 837
 838         /*
 839          * If we didn't get authentication data, just make up some
 840          * data.  The forwarding code will check the validity of the
 841          * response anyway, and substitute this data.  The X11
 842          * server, however, will ignore this fake data and use
 843          * whatever authentication mechanisms it was using otherwise
 844          * for the local connection.
 845          */
 846         if (!got_data) {
 847                 u_int32_t rand = 0;
 848
 849                 logit("Warning: No xauth data; "
 850                     "using fake authentication data for X11 forwarding.");
 851                 strlcpy(proto, SSH_X11_PROTO, sizeof proto);
 852                 for (i = 0; i < 16; i++) {
 853                         if (i % 4 == 0)
 854                                 rand = arc4random();
 855                         snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
 856                             rand & 0xff);
 857                         rand >>= 8;
 858                 }
 859         }
 860 }
 861
 862 static void
 863 ssh_init_forwarding(void)
 864 {
 865         int success = 0;
 866         int i;
 867
 868         /* Initiate local TCP/IP port forwardings. */
 869         for (i = 0; i < options.num_local_forwards; i++) {
 870                 debug("Connections to local port %d forwarded to remote address %.200s:%d",
 871                     options.local_forwards[i].port,
 872                     options.local_forwards[i].host,
 873                     options.local_forwards[i].host_port);
 874                 success += channel_setup_local_fwd_listener(
 875                     options.local_forwards[i].port,
 876                     options.local_forwards[i].host,
 877                     options.local_forwards[i].host_port,
 878                     options.gateway_ports);
 879         }
 880         if (i > 0 && success == 0)
 881                 error("Could not request local forwarding.");
 882
 883         /* Initiate remote TCP/IP port forwardings. */
 884         for (i = 0; i < options.num_remote_forwards; i++) {
 885                 debug("Connections to remote port %d forwarded to local address %.200s:%d",
 886                     options.remote_forwards[i].port,
 887                     options.remote_forwards[i].host,
 888                     options.remote_forwards[i].host_port);
 889                 channel_request_remote_forwarding(
 890                     options.remote_forwards[i].port,
 891                     options.remote_forwards[i].host,
 892                     options.remote_forwards[i].host_port);
 893         }
 894 }
 895
 896 static void
 897 check_agent_present(void)
 898 {
 899         if (options.forward_agent) {
 900                 /* Clear agent forwarding if we don\'t have an agent. */
 901                 if (!ssh_agent_present())
 902                         options.forward_agent = 0;
 903         }
 904 }
 905
 906 static int
 907 ssh_session(void)
 908 {
 909         int type;
 910         int interactive = 0;
 911         int have_tty = 0;
 912         struct winsize ws;
 913         char *cp;
 914
 915         /* Enable compression if requested. */
 916         if (options.compression) {
 917                 debug("Requesting compression at level %d.", options.compression_level);
 918
 919                 if (options.compression_level < 1 || options.compression_level > 9)
 920                         fatal("Compression level must be from 1 (fast) to 9 (slow, best).");
 921
 922                 /* Send the request. */
 923                 packet_start(SSH_CMSG_REQUEST_COMPRESSION);
 924                 packet_put_int(options.compression_level);
 925                 packet_send();
 926                 packet_write_wait();
 927                 type = packet_read();
 928                 if (type == SSH_SMSG_SUCCESS)
 929                         packet_start_compression(options.compression_level);
 930                 else if (type == SSH_SMSG_FAILURE)
 931                         logit("Warning: Remote host refused compression.");
 932                 else
 933                         packet_disconnect("Protocol error waiting for compression response.");
 934         }
 935         /* Allocate a pseudo tty if appropriate. */
 936         if (tty_flag) {
 937                 debug("Requesting pty.");
 938
 939                 /* Start the packet. */
 940                 packet_start(SSH_CMSG_REQUEST_PTY);
 941
 942                 /* Store TERM in the packet.  There is no limit on the
 943                    length of the string. */
 944                 cp = getenv("TERM");
 945                 if (!cp)
 946                         cp = "";
 947                 packet_put_cstring(cp);
 948
 949                 /* Store window size in the packet. */
 950                 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
 951                         memset(&ws, 0, sizeof(ws));
 952                 packet_put_int(ws.ws_row);
 953                 packet_put_int(ws.ws_col);
 954                 packet_put_int(ws.ws_xpixel);
 955                 packet_put_int(ws.ws_ypixel);
 956
 957                 /* Store tty modes in the packet. */
 958                 tty_make_modes(fileno(stdin), NULL);
 959
 960                 /* Send the packet, and wait for it to leave. */
 961                 packet_send();
 962                 packet_write_wait();
 963
 964                 /* Read response from the server. */
 965                 type = packet_read();
 966                 if (type == SSH_SMSG_SUCCESS) {
 967                         interactive = 1;
 968                         have_tty = 1;
 969                 } else if (type == SSH_SMSG_FAILURE)
 970                         logit("Warning: Remote host failed or refused to allocate a pseudo tty.");
 971                 else
 972                         packet_disconnect("Protocol error waiting for pty request response.");
 973         }
 974         /* Request X11 forwarding if enabled and DISPLAY is set. */
 975         if (options.forward_x11 && getenv("DISPLAY") != NULL) {
 976                 char *proto, *data;
 977                 /* Get reasonable local authentication information. */
 978                 x11_get_proto(&proto, &data);
 979                 /* Request forwarding with authentication spoofing. */
 980                 debug("Requesting X11 forwarding with authentication spoofing.");
 981                 x11_request_forwarding_with_spoofing(0, proto, data);
 982
 983                 /* Read response from the server. */
 984                 type = packet_read();
 985                 if (type == SSH_SMSG_SUCCESS) {
 986                         interactive = 1;
 987                 } else if (type == SSH_SMSG_FAILURE) {
 988                         logit("Warning: Remote host denied X11 forwarding.");
 989                 } else {
 990                         packet_disconnect("Protocol error waiting for X11 forwarding");
 991                 }
 992         }
 993         /* Tell the packet module whether this is an interactive session. */
 994         packet_set_interactive(interactive);
 995
 996         /* Request authentication agent forwarding if appropriate. */
 997         check_agent_present();
 998
 999         if (options.forward_agent) {
1000                 debug("Requesting authentication agent forwarding.");
1001                 auth_request_forwarding();
1002
1003                 /* Read response from the server. */
1004                 type = packet_read();
1005                 packet_check_eom();
1006                 if (type != SSH_SMSG_SUCCESS)
1007                         logit("Warning: Remote host denied authentication agent forwarding.");
1008         }
1009
1010         /* Initiate port forwardings. */
1011         ssh_init_forwarding();
1012
1013         /* If requested, let ssh continue in the background. */
1014         if (fork_after_authentication_flag)
1015                 if (daemon(1, 1) < 0)
1016                         fatal("daemon() failed: %.200s", strerror(errno));
1017
1018         /*
1019          * If a command was specified on the command line, execute the
1020          * command now. Otherwise request the server to start a shell.
1021          */
1022         if (buffer_len(&command) > 0) {
1023                 int len = buffer_len(&command);
1024                 if (len > 900)
1025                         len = 900;
1026                 debug("Sending command: %.*s", len, (u_char *)buffer_ptr(&command));
1027                 packet_start(SSH_CMSG_EXEC_CMD);
1028                 packet_put_string(buffer_ptr(&command), buffer_len(&command));
1029                 packet_send();
1030                 packet_write_wait();
1031         } else {
1032                 debug("Requesting shell.");
1033                 packet_start(SSH_CMSG_EXEC_SHELL);
1034                 packet_send();
1035                 packet_write_wait();
1036         }
1037
1038         /* Enter the interactive session. */
1039         return client_loop(have_tty, tty_flag ?
1040             options.escape_char : SSH_ESCAPECHAR_NONE, 0);
1041 }
1042
1043 static void
1044 client_subsystem_reply(int type, u_int32_t seq, void *ctxt)
1045 {
1046         int id, len;
1047
1048         id = packet_get_int();
1049         len = buffer_len(&command);
1050         if (len > 900)
1051                 len = 900;
1052         packet_check_eom();
1053         if (type == SSH2_MSG_CHANNEL_FAILURE)
1054                 fatal("Request for subsystem '%.*s' failed on channel %d",
1055                     len, (u_char *)buffer_ptr(&command), id);
1056 }
1057
1058 void
1059 client_global_request_reply_fwd(int type, u_int32_t seq, void *ctxt)
1060 {
1061         int i;
1062
1063         i = client_global_request_id++;
1064         if (i >= options.num_remote_forwards)
1065                 return;
1066         debug("remote forward %s for: listen %d, connect %s:%d",
1067             type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
1068             options.remote_forwards[i].port,
1069             options.remote_forwards[i].host,
1070             options.remote_forwards[i].host_port);
1071         if (type == SSH2_MSG_REQUEST_FAILURE)
1072                 logit("Warning: remote port forwarding failed for listen port %d",
1073                     options.remote_forwards[i].port);
1074 }
1075
1076 /* request pty/x11/agent/tcpfwd/shell for channel */
1077 static void
1078 ssh_session2_setup(int id, void *arg)
1079 {
1080         int len;
1081         int interactive = 0;
1082         struct termios tio;
1083
1084         debug2("ssh_session2_setup: id %d", id);
1085
1086         if (tty_flag) {
1087                 struct winsize ws;
1088                 char *cp;
1089                 cp = getenv("TERM");
1090                 if (!cp)
1091                         cp = "";
1092                 /* Store window size in the packet. */
1093                 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
1094                         memset(&ws, 0, sizeof(ws));
1095
1096                 channel_request_start(id, "pty-req", 0);
1097                 packet_put_cstring(cp);
1098                 packet_put_int(ws.ws_col);
1099                 packet_put_int(ws.ws_row);
1100                 packet_put_int(ws.ws_xpixel);
1101                 packet_put_int(ws.ws_ypixel);
1102                 tio = get_saved_tio();
1103                 tty_make_modes(/*ignored*/ 0, &tio);
1104                 packet_send();
1105                 interactive = 1;
1106                 /* XXX wait for reply */
1107         }
1108         if (options.forward_x11 &&
1109             getenv("DISPLAY") != NULL) {
1110                 char *proto, *data;
1111                 /* Get reasonable local authentication information. */
1112                 x11_get_proto(&proto, &data);
1113                 /* Request forwarding with authentication spoofing. */
1114                 debug("Requesting X11 forwarding with authentication spoofing.");
1115                 x11_request_forwarding_with_spoofing(id, proto, data);
1116                 interactive = 1;
1117                 /* XXX wait for reply */
1118         }
1119
1120         check_agent_present();
1121         if (options.forward_agent) {
1122                 debug("Requesting authentication agent forwarding.");
1123                 channel_request_start(id, "auth-agent-req@openssh.com", 0);
1124                 packet_send();
1125         }
1126
1127         len = buffer_len(&command);
1128         if (len > 0) {
1129                 if (len > 900)
1130                         len = 900;
1131                 if (subsystem_flag) {
1132                         debug("Sending subsystem: %.*s", len, (u_char *)buffer_ptr(&command));
1133                         channel_request_start(id, "subsystem", /*want reply*/ 1);
1134                         /* register callback for reply */
1135                         /* XXX we assume that client_loop has already been called */
1136                         dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &client_subsystem_reply);
1137                         dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &client_subsystem_reply);
1138                 } else {
1139                         debug("Sending command: %.*s", len, (u_char *)buffer_ptr(&command));
1140                         channel_request_start(id, "exec", 0);
1141                 }
1142                 packet_put_string(buffer_ptr(&command), buffer_len(&command));
1143                 packet_send();
1144         } else {
1145                 channel_request_start(id, "shell", 0);
1146                 packet_send();
1147         }
1148
1149         packet_set_interactive(interactive);
1150 }
1151
1152 /* open new channel for a session */
1153 static int
1154 ssh_session2_open(void)
1155 {
1156         Channel *c;
1157         int window, packetmax, in, out, err;
1158
1159         if (stdin_null_flag) {
1160                 in = open(_PATH_DEVNULL, O_RDONLY);
1161         } else {
1162                 in = dup(STDIN_FILENO);
1163         }
1164         out = dup(STDOUT_FILENO);
1165         err = dup(STDERR_FILENO);
1166
1167         if (in < 0 || out < 0 || err < 0)
1168                 fatal("dup() in/out/err failed");
1169
1170         /* enable nonblocking unless tty */
1171         if (!isatty(in))
1172                 set_nonblock(in);
1173         if (!isatty(out))
1174                 set_nonblock(out);
1175         if (!isatty(err))
1176                 set_nonblock(err);
1177
1178         window = CHAN_SES_WINDOW_DEFAULT;
1179         packetmax = CHAN_SES_PACKET_DEFAULT;
1180         if (tty_flag) {
1181                 window >>= 1;
1182                 packetmax >>= 1;
1183         }
1184         c = channel_new(
1185             "session", SSH_CHANNEL_OPENING, in, out, err,
1186             window, packetmax, CHAN_EXTENDED_WRITE,
1187             "client-session", /*nonblock*/0);
1188
1189         debug3("ssh_session2_open: channel_new: %d", c->self);
1190
1191         channel_send_open(c->self);
1192         if (!no_shell_flag)
1193                 channel_register_confirm(c->self, ssh_session2_setup);
1194
1195         return c->self;
1196 }
1197
1198 static int
1199 ssh_session2(void)
1200 {
1201         int id = -1;
1202
1203         /* XXX should be pre-session */
1204         ssh_init_forwarding();
1205
1206         if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN))
1207                 id = ssh_session2_open();
1208
1209         /* If requested, let ssh continue in the background. */
1210         if (fork_after_authentication_flag)
1211                 if (daemon(1, 1) < 0)
1212                         fatal("daemon() failed: %.200s", strerror(errno));
1213
1214         return client_loop(tty_flag, tty_flag ?
1215             options.escape_char : SSH_ESCAPECHAR_NONE, id);
1216 }
1217
1218 static void
1219 load_public_identity_files(void)
1220 {
1221         char *filename;
1222         int i = 0;
1223         Key *public;
1224 #ifdef SMARTCARD
1225         Key **keys;
1226
1227         if (options.smartcard_device != NULL &&
1228             options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
1229             (keys = sc_get_keys(options.smartcard_device, NULL)) != NULL ) {
1230                 int count = 0;
1231                 for (i = 0; keys[i] != NULL; i++) {
1232                         count++;
1233                         memmove(&options.identity_files[1], &options.identity_files[0],
1234                             sizeof(char *) * (SSH_MAX_IDENTITY_FILES - 1));
1235                         memmove(&options.identity_keys[1], &options.identity_keys[0],
1236                             sizeof(Key *) * (SSH_MAX_IDENTITY_FILES - 1));
1237                         options.num_identity_files++;
1238                         options.identity_keys[0] = keys[i];
1239                         options.identity_files[0] = sc_get_key_label(keys[i]);
1240                 }
1241                 if (options.num_identity_files > SSH_MAX_IDENTITY_FILES)
1242                         options.num_identity_files = SSH_MAX_IDENTITY_FILES;
1243                 i = count;
1244                 xfree(keys);
1245         }
1246 #endif /* SMARTCARD */
1247         for (; i < options.num_identity_files; i++) {
1248                 filename = tilde_expand_filename(options.identity_files[i],
1249                     original_real_uid);
1250                 public = key_load_public(filename, NULL);
1251                 debug("identity file %s type %d", filename,
1252                     public ? public->type : -1);
1253                 xfree(options.identity_files[i]);
1254                 options.identity_files[i] = filename;
1255                 options.identity_keys[i] = public;
1256         }
1257 }