Annotation of src/usr.bin/ssh/ssh.c, Revision 1.199
1.1 deraadt 1: /*
1.32 deraadt 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: *
1.64 deraadt 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.
1.169 markus 16: * Copyright (c) 2000, 2001, 2002 Markus Friedl. All rights reserved.
1.64 deraadt 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.
1.32 deraadt 40: */
1.1 deraadt 41:
42: #include "includes.h"
1.199 ! markus 43: RCSID("$OpenBSD: ssh.c,v 1.198 2003/07/22 13:35:22 markus Exp $");
1.49 markus 44:
45: #include <openssl/evp.h>
1.72 markus 46: #include <openssl/err.h>
1.1 deraadt 47:
1.84 markus 48: #include "ssh.h"
49: #include "ssh1.h"
50: #include "ssh2.h"
51: #include "compat.h"
52: #include "cipher.h"
1.1 deraadt 53: #include "xmalloc.h"
54: #include "packet.h"
55: #include "buffer.h"
1.123 markus 56: #include "channels.h"
1.49 markus 57: #include "key.h"
1.58 markus 58: #include "authfd.h"
1.49 markus 59: #include "authfile.h"
1.83 markus 60: #include "pathnames.h"
1.81 markus 61: #include "clientloop.h"
1.84 markus 62: #include "log.h"
63: #include "readconf.h"
64: #include "sshconnect.h"
65: #include "tildexpand.h"
1.89 markus 66: #include "dispatch.h"
1.84 markus 67: #include "misc.h"
1.95 markus 68: #include "kex.h"
69: #include "mac.h"
1.115 stevesk 70: #include "sshtty.h"
1.49 markus 71:
1.127 markus 72: #ifdef SMARTCARD
73: #include "scard.h"
1.137 jakob 74: #endif
1.127 markus 75:
1.49 markus 76: extern char *__progname;
1.1 deraadt 77:
1.31 markus 78: /* Flag indicating whether debug mode is on. This can be set on the command line. */
1.1 deraadt 79: int debug_flag = 0;
80:
1.46 markus 81: /* Flag indicating whether a tty should be allocated */
1.1 deraadt 82: int tty_flag = 0;
1.79 markus 83: int no_tty_flag = 0;
84: int force_tty_flag = 0;
1.1 deraadt 85:
1.45 markus 86: /* don't exec a shell */
87: int no_shell_flag = 0;
88:
1.33 markus 89: /*
90: * Flag indicating that nothing should be read from stdin. This can be set
91: * on the command line.
92: */
1.1 deraadt 93: int stdin_null_flag = 0;
94:
1.33 markus 95: /*
96: * Flag indicating that ssh should fork after authentication. This is useful
1.172 deraadt 97: * so that the passphrase can be entered manually, and then ssh goes to the
1.33 markus 98: * background.
99: */
1.1 deraadt 100: int fork_after_authentication_flag = 0;
101:
1.33 markus 102: /*
103: * General data structure for command line options and options configurable
104: * in configuration files. See readconf.h.
105: */
1.1 deraadt 106: Options options;
107:
1.139 markus 108: /* optional user configfile */
109: char *config = NULL;
110:
1.33 markus 111: /*
112: * Name of the host we are connecting to. This is the name given on the
113: * command line, or the HostName specified for the user-supplied name in a
114: * configuration file.
115: */
1.1 deraadt 116: char *host;
117:
1.22 provos 118: /* socket address the host resolves to */
1.37 markus 119: struct sockaddr_storage hostaddr;
1.1 deraadt 120:
1.112 markus 121: /* Private host keys. */
1.173 markus 122: Sensitive sensitive_data;
1.1 deraadt 123:
1.10 dugsong 124: /* Original real UID. */
125: uid_t original_real_uid;
1.177 markus 126: uid_t original_effective_uid;
1.1 deraadt 127:
1.45 markus 128: /* command to be executed */
129: Buffer command;
130:
1.85 djm 131: /* Should we execute a command or invoke a subsystem? */
132: int subsystem_flag = 0;
133:
1.170 markus 134: /* # of replies received for global requests */
135: static int client_global_request_id = 0;
136:
1.186 djm 137: /* pid of proxycommand child process */
138: pid_t proxy_command_pid = 0;
139:
1.1 deraadt 140: /* Prints a help message to the user. This function never returns. */
141:
1.126 itojun 142: static void
1.93 itojun 143: usage(void)
1.1 deraadt 144: {
1.76 markus 145: fprintf(stderr, "Usage: %s [options] host [command]\n", __progname);
1.31 markus 146: fprintf(stderr, "Options:\n");
147: fprintf(stderr, " -l user Log in using this user name.\n");
1.93 itojun 148: fprintf(stderr, " -n Redirect input from " _PATH_DEVNULL ".\n");
1.139 markus 149: fprintf(stderr, " -F config Config file (default: ~/%s).\n",
150: _PATH_SSH_USER_CONFFILE);
1.53 markus 151: fprintf(stderr, " -A Enable authentication agent forwarding.\n");
1.120 markus 152: fprintf(stderr, " -a Disable authentication agent forwarding (default).\n");
1.198 markus 153: fprintf(stderr, " -k Disable Kerberos ticket forwarding.\n");
1.88 stevesk 154: fprintf(stderr, " -X Enable X11 connection forwarding.\n");
1.120 markus 155: fprintf(stderr, " -x Disable X11 connection forwarding (default).\n");
1.99 deraadt 156: fprintf(stderr, " -i file Identity for public key authentication "
157: "(default: ~/.ssh/identity)\n");
1.135 jakob 158: #ifdef SMARTCARD
159: fprintf(stderr, " -I reader Set smartcard reader.\n");
1.137 jakob 160: #endif
1.31 markus 161: fprintf(stderr, " -t Tty; allocate a tty even if command is given.\n");
1.45 markus 162: fprintf(stderr, " -T Do not allocate a tty.\n");
1.31 markus 163: fprintf(stderr, " -v Verbose; display verbose debugging messages.\n");
1.66 markus 164: fprintf(stderr, " Multiple -v increases verbosity.\n");
1.31 markus 165: fprintf(stderr, " -V Display version number only.\n");
166: fprintf(stderr, " -q Quiet; don't display any warning messages.\n");
167: fprintf(stderr, " -f Fork into background after authentication.\n");
168: fprintf(stderr, " -e char Set escape character; ``none'' = disable (default: ~).\n");
169:
1.120 markus 170: fprintf(stderr, " -c cipher Select encryption algorithm\n");
1.102 stevesk 171: fprintf(stderr, " -m macs Specify MAC algorithms for protocol version 2.\n");
1.31 markus 172: fprintf(stderr, " -p port Connect to this port. Server must be on the same port.\n");
173: fprintf(stderr, " -L listen-port:host:port Forward local port to remote address\n");
174: fprintf(stderr, " -R listen-port:host:port Forward remote port to local address\n");
1.76 markus 175: fprintf(stderr, " These cause %s to listen for connections on a port, and\n", __progname);
1.31 markus 176: fprintf(stderr, " forward them to the other side by connecting to host:port.\n");
1.140 stevesk 177: fprintf(stderr, " -D port Enable dynamic application-level port forwarding.\n");
1.31 markus 178: fprintf(stderr, " -C Enable compression.\n");
1.45 markus 179: fprintf(stderr, " -N Do not execute a shell or command.\n");
1.31 markus 180: fprintf(stderr, " -g Allow remote hosts to connect to forwarded ports.\n");
1.92 jakob 181: fprintf(stderr, " -1 Force protocol version 1.\n");
182: fprintf(stderr, " -2 Force protocol version 2.\n");
1.37 markus 183: fprintf(stderr, " -4 Use IPv4 only.\n");
184: fprintf(stderr, " -6 Use IPv6 only.\n");
1.31 markus 185: fprintf(stderr, " -o 'option' Process the option as if it was read from a configuration file.\n");
1.85 djm 186: fprintf(stderr, " -s Invoke command (mandatory) as SSH2 subsystem.\n");
1.120 markus 187: fprintf(stderr, " -b addr Local IP address.\n");
1.31 markus 188: exit(1);
1.1 deraadt 189: }
190:
1.126 itojun 191: static int ssh_session(void);
192: static int ssh_session2(void);
193: static void load_public_identity_files(void);
1.45 markus 194:
1.32 deraadt 195: /*
196: * Main program for the ssh client.
197: */
1.2 provos 198: int
199: main(int ac, char **av)
1.1 deraadt 200: {
1.178 markus 201: int i, opt, exit_status;
1.35 markus 202: u_short fwd_port, fwd_host_port;
1.141 stevesk 203: char sfwd_port[6], sfwd_host_port[6];
1.128 fgsch 204: char *p, *cp, buf[256];
1.31 markus 205: struct stat st;
1.98 markus 206: struct passwd *pw;
1.45 markus 207: int dummy;
1.144 stevesk 208: extern int optind, optreset;
209: extern char *optarg;
1.31 markus 210:
1.33 markus 211: /*
212: * Save the original real uid. It will be needed later (uid-swapping
213: * may clobber the real uid).
214: */
1.31 markus 215: original_real_uid = getuid();
216: original_effective_uid = geteuid();
217:
1.184 stevesk 218: /*
219: * Use uid-swapping to give up root privileges for the duration of
220: * option processing. We will re-instantiate the rights when we are
221: * ready to create the privileged port, and will permanently drop
222: * them when the port has been created (actually, when the connection
223: * has been made, as we may need to create the port several times).
224: */
225: PRIV_END;
226:
1.31 markus 227: /* If we are installed setuid root be careful to not drop core. */
228: if (original_real_uid != original_effective_uid) {
229: struct rlimit rlim;
230: rlim.rlim_cur = rlim.rlim_max = 0;
231: if (setrlimit(RLIMIT_CORE, &rlim) < 0)
232: fatal("setrlimit failed: %.100s", strerror(errno));
1.1 deraadt 233: }
1.107 markus 234: /* Get user data. */
235: pw = getpwuid(original_real_uid);
236: if (!pw) {
1.191 itojun 237: logit("You don't exist, go away!");
1.107 markus 238: exit(1);
239: }
240: /* Take a copy of the returned structure. */
241: pw = pwcopy(pw);
1.31 markus 242:
1.33 markus 243: /*
244: * Set our umask to something reasonable, as some files are created
245: * with the default umask. This will make them world-readable but
246: * writable only by the owner, which is ok for all files for which we
247: * don't set the modes explicitly.
248: */
1.31 markus 249: umask(022);
250:
251: /* Initialize option structure to indicate that no values have been set. */
252: initialize_options(&options);
253:
254: /* Parse command-line arguments. */
255: host = NULL;
256:
1.128 fgsch 257: again:
258: while ((opt = getopt(ac, av,
1.139 markus 259: "1246ab:c:e:fgi:kl:m:no:p:qstvxACD:F:I:L:NPR:TVX")) != -1) {
1.31 markus 260: switch (opt) {
1.91 jakob 261: case '1':
262: options.protocol = SSH_PROTO_1;
263: break;
1.47 markus 264: case '2':
265: options.protocol = SSH_PROTO_2;
266: break;
1.37 markus 267: case '4':
1.196 djm 268: options.address_family = AF_INET;
1.37 markus 269: break;
270: case '6':
1.196 djm 271: options.address_family = AF_INET6;
1.37 markus 272: break;
1.31 markus 273: case 'n':
274: stdin_null_flag = 1;
275: break;
276: case 'f':
277: fork_after_authentication_flag = 1;
278: stdin_null_flag = 1;
279: break;
280: case 'x':
281: options.forward_x11 = 0;
282: break;
283: case 'X':
284: options.forward_x11 = 1;
285: break;
286: case 'g':
287: options.gateway_ports = 1;
288: break;
1.183 stevesk 289: case 'P': /* deprecated */
1.31 markus 290: options.use_privileged_port = 0;
291: break;
292: case 'a':
293: options.forward_agent = 0;
1.53 markus 294: break;
295: case 'A':
296: options.forward_agent = 1;
1.31 markus 297: break;
298: case 'k':
299: options.kerberos_tgt_passing = 0;
300: break;
301: case 'i':
302: if (stat(optarg, &st) < 0) {
1.128 fgsch 303: fprintf(stderr, "Warning: Identity file %s "
304: "does not exist.\n", optarg);
1.31 markus 305: break;
306: }
1.128 fgsch 307: if (options.num_identity_files >=
308: SSH_MAX_IDENTITY_FILES)
309: fatal("Too many identity files specified "
310: "(max %d)", SSH_MAX_IDENTITY_FILES);
311: options.identity_files[options.num_identity_files++] =
312: xstrdup(optarg);
1.31 markus 313: break;
1.127 markus 314: case 'I':
315: #ifdef SMARTCARD
1.133 markus 316: options.smartcard_device = xstrdup(optarg);
1.137 jakob 317: #else
1.127 markus 318: fprintf(stderr, "no support for smartcards.\n");
1.137 jakob 319: #endif
1.127 markus 320: break;
1.31 markus 321: case 't':
1.79 markus 322: if (tty_flag)
323: force_tty_flag = 1;
1.31 markus 324: tty_flag = 1;
325: break;
326: case 'v':
1.197 markus 327: if (debug_flag == 0) {
1.66 markus 328: debug_flag = 1;
329: options.log_level = SYSLOG_LEVEL_DEBUG1;
1.197 markus 330: } else {
331: if (options.log_level < SYSLOG_LEVEL_DEBUG3)
332: options.log_level++;
1.66 markus 333: break;
1.197 markus 334: }
1.66 markus 335: /* fallthrough */
1.31 markus 336: case 'V':
1.96 deraadt 337: fprintf(stderr,
1.193 djm 338: "%s, SSH protocols %d.%d/%d.%d, %s\n",
1.46 markus 339: SSH_VERSION,
340: PROTOCOL_MAJOR_1, PROTOCOL_MINOR_1,
1.96 deraadt 341: PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2,
1.193 djm 342: SSLeay_version(SSLEAY_VERSION));
1.31 markus 343: if (opt == 'V')
344: exit(0);
345: break;
346: case 'q':
347: options.log_level = SYSLOG_LEVEL_QUIET;
348: break;
349: case 'e':
350: if (optarg[0] == '^' && optarg[2] == 0 &&
1.128 fgsch 351: (u_char) optarg[1] >= 64 &&
352: (u_char) optarg[1] < 128)
1.78 markus 353: options.escape_char = (u_char) optarg[1] & 31;
1.31 markus 354: else if (strlen(optarg) == 1)
1.78 markus 355: options.escape_char = (u_char) optarg[0];
1.31 markus 356: else if (strcmp(optarg, "none") == 0)
1.119 stevesk 357: options.escape_char = SSH_ESCAPECHAR_NONE;
1.31 markus 358: else {
1.128 fgsch 359: fprintf(stderr, "Bad escape character '%s'.\n",
360: optarg);
1.31 markus 361: exit(1);
362: }
363: break;
364: case 'c':
1.49 markus 365: if (ciphers_valid(optarg)) {
366: /* SSH2 only */
367: options.ciphers = xstrdup(optarg);
1.51 markus 368: options.cipher = SSH_CIPHER_ILLEGAL;
1.49 markus 369: } else {
370: /* SSH1 only */
1.74 markus 371: options.cipher = cipher_number(optarg);
372: if (options.cipher == -1) {
1.128 fgsch 373: fprintf(stderr,
374: "Unknown cipher type '%s'\n",
375: optarg);
1.49 markus 376: exit(1);
377: }
1.128 fgsch 378: if (options.cipher == SSH_CIPHER_3DES)
1.74 markus 379: options.ciphers = "3des-cbc";
1.128 fgsch 380: else if (options.cipher == SSH_CIPHER_BLOWFISH)
1.74 markus 381: options.ciphers = "blowfish-cbc";
1.128 fgsch 382: else
1.74 markus 383: options.ciphers = (char *)-1;
1.95 markus 384: }
385: break;
386: case 'm':
387: if (mac_valid(optarg))
388: options.macs = xstrdup(optarg);
389: else {
1.128 fgsch 390: fprintf(stderr, "Unknown mac type '%s'\n",
391: optarg);
1.95 markus 392: exit(1);
1.31 markus 393: }
394: break;
395: case 'p':
1.113 stevesk 396: options.port = a2port(optarg);
397: if (options.port == 0) {
1.109 markus 398: fprintf(stderr, "Bad port '%s'\n", optarg);
399: exit(1);
400: }
1.31 markus 401: break;
402: case 'l':
403: options.user = optarg;
404: break;
1.141 stevesk 405:
406: case 'L':
1.31 markus 407: case 'R':
1.141 stevesk 408: if (sscanf(optarg, "%5[0-9]:%255[^:]:%5[0-9]",
409: sfwd_port, buf, sfwd_host_port) != 3 &&
410: sscanf(optarg, "%5[0-9]/%255[^/]/%5[0-9]",
411: sfwd_port, buf, sfwd_host_port) != 3) {
1.128 fgsch 412: fprintf(stderr,
1.141 stevesk 413: "Bad forwarding specification '%s'\n",
1.128 fgsch 414: optarg);
1.31 markus 415: usage();
416: /* NOTREACHED */
417: }
1.141 stevesk 418: if ((fwd_port = a2port(sfwd_port)) == 0 ||
1.165 markus 419: (fwd_host_port = a2port(sfwd_host_port)) == 0) {
1.128 fgsch 420: fprintf(stderr,
1.141 stevesk 421: "Bad forwarding port(s) '%s'\n", optarg);
422: exit(1);
1.31 markus 423: }
1.141 stevesk 424: if (opt == 'L')
425: add_local_forward(&options, fwd_port, buf,
426: fwd_host_port);
427: else if (opt == 'R')
428: add_remote_forward(&options, fwd_port, buf,
1.151 deraadt 429: fwd_host_port);
1.31 markus 430: break;
1.108 markus 431:
432: case 'D':
1.113 stevesk 433: fwd_port = a2port(optarg);
434: if (fwd_port == 0) {
1.128 fgsch 435: fprintf(stderr, "Bad dynamic port '%s'\n",
436: optarg);
1.109 markus 437: exit(1);
438: }
1.108 markus 439: add_local_forward(&options, fwd_port, "socks4", 0);
440: break;
441:
1.31 markus 442: case 'C':
443: options.compression = 1;
444: break;
1.45 markus 445: case 'N':
446: no_shell_flag = 1;
447: no_tty_flag = 1;
448: break;
449: case 'T':
450: no_tty_flag = 1;
451: break;
1.31 markus 452: case 'o':
453: dummy = 1;
1.128 fgsch 454: if (process_config_line(&options, host ? host : "",
455: optarg, "command-line", 0, &dummy) != 0)
1.31 markus 456: exit(1);
457: break;
1.85 djm 458: case 's':
459: subsystem_flag = 1;
1.117 markus 460: break;
461: case 'b':
462: options.bind_address = optarg;
1.85 djm 463: break;
1.139 markus 464: case 'F':
465: config = optarg;
466: break;
1.31 markus 467: default:
468: usage();
1.1 deraadt 469: }
1.31 markus 470: }
471:
1.128 fgsch 472: ac -= optind;
473: av += optind;
474:
475: if (ac > 0 && !host && **av != '-') {
1.188 markus 476: if (strrchr(*av, '@')) {
1.128 fgsch 477: p = xstrdup(*av);
1.188 markus 478: cp = strrchr(p, '@');
1.128 fgsch 479: if (cp == NULL || cp == p)
480: usage();
481: options.user = p;
482: *cp = '\0';
483: host = ++cp;
484: } else
485: host = *av;
1.189 millert 486: if (ac > 1) {
487: optind = optreset = 1;
1.128 fgsch 488: goto again;
489: }
1.189 millert 490: ac--, av++;
1.128 fgsch 491: }
492:
1.31 markus 493: /* Check that we got a host name. */
494: if (!host)
495: usage();
496:
1.54 markus 497: SSLeay_add_all_algorithms();
1.72 markus 498: ERR_load_crypto_strings();
1.31 markus 499:
500: /* Initialize the command to execute on remote host. */
501: buffer_init(&command);
1.1 deraadt 502:
1.33 markus 503: /*
504: * Save the command to execute on the remote host in a buffer. There
505: * is no limit on the length of the command, except by the maximum
506: * packet size. Also sets the tty flag if there is no command.
507: */
1.128 fgsch 508: if (!ac) {
1.31 markus 509: /* No command specified - execute shell on a tty. */
510: tty_flag = 1;
1.85 djm 511: if (subsystem_flag) {
1.128 fgsch 512: fprintf(stderr,
513: "You must specify a subsystem to invoke.\n");
1.85 djm 514: usage();
515: }
1.31 markus 516: } else {
1.128 fgsch 517: /* A command has been specified. Store it into the buffer. */
518: for (i = 0; i < ac; i++) {
519: if (i)
1.31 markus 520: buffer_append(&command, " ", 1);
521: buffer_append(&command, av[i], strlen(av[i]));
522: }
523: }
524:
525: /* Cannot fork to background if no command. */
1.63 markus 526: if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag)
1.31 markus 527: fatal("Cannot fork into background without a command to execute.");
528:
529: /* Allocate a tty by default if no command specified. */
530: if (buffer_len(&command) == 0)
531: tty_flag = 1;
532:
1.180 deraadt 533: /* Force no tty */
1.75 markus 534: if (no_tty_flag)
535: tty_flag = 0;
1.31 markus 536: /* Do not allocate a tty if stdin is not a tty. */
1.79 markus 537: if (!isatty(fileno(stdin)) && !force_tty_flag) {
1.31 markus 538: if (tty_flag)
1.191 itojun 539: logit("Pseudo-terminal will not be allocated because stdin is not a terminal.");
1.31 markus 540: tty_flag = 0;
541: }
1.45 markus 542:
1.101 markus 543: /*
544: * Initialize "log" output. Since we are the client all output
545: * actually goes to stderr.
546: */
1.111 markus 547: log_init(av[0], options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level,
548: SYSLOG_FACILITY_USER, 1);
1.31 markus 549:
1.139 markus 550: /*
551: * Read per-user configuration file. Ignore the system wide config
552: * file if the user specifies a config file on the command line.
553: */
554: if (config != NULL) {
1.142 stevesk 555: if (!read_config_file(config, host, &options))
556: fatal("Can't open user config file %.100s: "
557: "%.100s", config, strerror(errno));
1.139 markus 558: } else {
559: snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir,
560: _PATH_SSH_USER_CONFFILE);
1.145 markus 561: (void)read_config_file(buf, host, &options);
1.139 markus 562:
1.145 markus 563: /* Read systemwide configuration file after use config. */
1.142 stevesk 564: (void)read_config_file(_PATH_HOST_CONFIG_FILE, host, &options);
1.139 markus 565: }
1.31 markus 566:
567: /* Fill configuration defaults. */
568: fill_default_options(&options);
569:
1.196 djm 570: channel_set_af(options.address_family);
571:
1.31 markus 572: /* reinit */
1.101 markus 573: log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 1);
1.31 markus 574:
575: if (options.user == NULL)
576: options.user = xstrdup(pw->pw_name);
577:
578: if (options.hostname != NULL)
579: host = options.hostname;
1.195 markus 580:
581: /* force lowercase for hostkey matching */
582: if (options.host_key_alias != NULL) {
583: for (p = options.host_key_alias; *p; p++)
584: if (isupper(*p))
585: *p = tolower(*p);
586: }
1.190 markus 587:
588: if (options.proxy_command != NULL &&
589: strcmp(options.proxy_command, "none") == 0)
590: options.proxy_command = NULL;
1.31 markus 591:
1.77 markus 592: /* Open a connection to the remote host. */
1.196 djm 593: if (ssh_connect(host, &hostaddr, options.port,
594: options.address_family, options.connection_attempts,
1.177 markus 595: original_effective_uid == 0 && options.use_privileged_port,
1.179 markus 596: options.proxy_command) != 0)
1.178 markus 597: exit(1);
1.31 markus 598:
1.33 markus 599: /*
600: * If we successfully made the connection, load the host private key
601: * in case we will need it later for combined rsa-rhosts
602: * authentication. This must be done before releasing extra
603: * privileges, because the file is only readable by root.
1.174 markus 604: * If we cannot access the private keys, load the public keys
605: * instead and try to execute the ssh-keysign helper instead.
1.33 markus 606: */
1.112 markus 607: sensitive_data.nkeys = 0;
608: sensitive_data.keys = NULL;
1.173 markus 609: sensitive_data.external_keysign = 0;
1.178 markus 610: if (options.rhosts_rsa_authentication ||
611: options.hostbased_authentication) {
1.112 markus 612: sensitive_data.nkeys = 3;
1.180 deraadt 613: sensitive_data.keys = xmalloc(sensitive_data.nkeys *
614: sizeof(Key));
1.177 markus 615:
616: PRIV_START;
1.112 markus 617: sensitive_data.keys[0] = key_load_private_type(KEY_RSA1,
1.105 markus 618: _PATH_HOST_KEY_FILE, "", NULL);
1.112 markus 619: sensitive_data.keys[1] = key_load_private_type(KEY_DSA,
620: _PATH_HOST_DSA_KEY_FILE, "", NULL);
621: sensitive_data.keys[2] = key_load_private_type(KEY_RSA,
622: _PATH_HOST_RSA_KEY_FILE, "", NULL);
1.177 markus 623: PRIV_END;
1.173 markus 624:
1.181 markus 625: if (options.hostbased_authentication == 1 &&
626: sensitive_data.keys[0] == NULL &&
1.173 markus 627: sensitive_data.keys[1] == NULL &&
628: sensitive_data.keys[2] == NULL) {
629: sensitive_data.keys[1] = key_load_public(
630: _PATH_HOST_DSA_KEY_FILE, NULL);
631: sensitive_data.keys[2] = key_load_public(
632: _PATH_HOST_RSA_KEY_FILE, NULL);
633: sensitive_data.external_keysign = 1;
634: }
1.31 markus 635: }
1.33 markus 636: /*
637: * Get rid of any extra privileges that we may have. We will no
638: * longer need them. Also, extra privileges could make it very hard
639: * to read identity files and other non-world-readable files from the
640: * user's home directory if it happens to be on a NFS volume where
641: * root is mapped to nobody.
642: */
1.177 markus 643: seteuid(original_real_uid);
644: setuid(original_real_uid);
1.31 markus 645:
1.33 markus 646: /*
647: * Now that we are back to our own permissions, create ~/.ssh
648: * directory if it doesn\'t already exist.
649: */
1.138 jakob 650: snprintf(buf, sizeof buf, "%.100s%s%.100s", pw->pw_dir, strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR);
1.31 markus 651: if (stat(buf, &st) < 0)
1.57 djm 652: if (mkdir(buf, 0700) < 0)
1.31 markus 653: error("Could not create directory '%.200s'.", buf);
654:
1.104 markus 655: /* load options.identity_files */
656: load_public_identity_files();
657:
658: /* Expand ~ in known host file names. */
659: /* XXX mem-leaks: */
1.72 markus 660: options.system_hostfile =
661: tilde_expand_filename(options.system_hostfile, original_real_uid);
662: options.user_hostfile =
663: tilde_expand_filename(options.user_hostfile, original_real_uid);
664: options.system_hostfile2 =
665: tilde_expand_filename(options.system_hostfile2, original_real_uid);
666: options.user_hostfile2 =
667: tilde_expand_filename(options.user_hostfile2, original_real_uid);
1.149 markus 668:
669: signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
1.31 markus 670:
671: /* Log into the remote system. This never returns if the login fails. */
1.173 markus 672: ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr, pw);
1.31 markus 673:
1.112 markus 674: /* We no longer need the private host keys. Clear them now. */
675: if (sensitive_data.nkeys != 0) {
676: for (i = 0; i < sensitive_data.nkeys; i++) {
677: if (sensitive_data.keys[i] != NULL) {
678: /* Destroys contents safely */
679: debug3("clear hostkey %d", i);
680: key_free(sensitive_data.keys[i]);
681: sensitive_data.keys[i] = NULL;
682: }
683: }
684: xfree(sensitive_data.keys);
1.134 markus 685: }
686: for (i = 0; i < options.num_identity_files; i++) {
687: if (options.identity_files[i]) {
688: xfree(options.identity_files[i]);
689: options.identity_files[i] = NULL;
690: }
691: if (options.identity_keys[i]) {
692: key_free(options.identity_keys[i]);
693: options.identity_keys[i] = NULL;
694: }
1.112 markus 695: }
1.31 markus 696:
1.45 markus 697: exit_status = compat20 ? ssh_session2() : ssh_session();
698: packet_close();
1.186 djm 699:
700: /*
701: * Send SIGHUP to proxy command if used. We don't wait() in
702: * case it hangs and instead rely on init to reap the child
703: */
704: if (proxy_command_pid > 1)
705: kill(proxy_command_pid, SIGHUP);
706:
1.45 markus 707: return exit_status;
708: }
709:
1.126 itojun 710: static void
1.150 stevesk 711: x11_get_proto(char **_proto, char **_data)
1.50 markus 712: {
713: char line[512];
1.150 stevesk 714: static char proto[512], data[512];
1.50 markus 715: FILE *f;
716: int got_data = 0, i;
1.159 stevesk 717: char *display;
1.182 stevesk 718: struct stat st;
1.50 markus 719:
1.150 stevesk 720: *_proto = proto;
721: *_data = data;
722: proto[0] = data[0] = '\0';
1.182 stevesk 723: if (!options.xauth_location ||
724: (stat(options.xauth_location, &st) == -1)) {
725: debug("No xauth program.");
726: } else {
727: if ((display = getenv("DISPLAY")) == NULL) {
728: debug("x11_get_proto: DISPLAY not set");
729: return;
730: }
1.55 markus 731: /* Try to get Xauthority information for the display. */
1.159 stevesk 732: if (strncmp(display, "localhost:", 10) == 0)
733: /*
734: * Handle FamilyLocal case where $DISPLAY does
735: * not match an authorization entry. For this we
736: * just try "xauth list unix:displaynum.screennum".
737: * XXX: "localhost" match to determine FamilyLocal
738: * is not perfect.
739: */
1.171 stevesk 740: snprintf(line, sizeof line, "%s list unix:%s 2>"
1.159 stevesk 741: _PATH_DEVNULL, options.xauth_location, display+10);
742: else
1.171 stevesk 743: snprintf(line, sizeof line, "%s list %.200s 2>"
1.159 stevesk 744: _PATH_DEVNULL, options.xauth_location, display);
1.182 stevesk 745: debug2("x11_get_proto: %s", line);
1.55 markus 746: f = popen(line, "r");
747: if (f && fgets(line, sizeof(line), f) &&
1.150 stevesk 748: sscanf(line, "%*s %511s %511s", proto, data) == 2)
1.55 markus 749: got_data = 1;
750: if (f)
751: pclose(f);
752: }
1.50 markus 753: /*
754: * If we didn't get authentication data, just make up some
755: * data. The forwarding code will check the validity of the
756: * response anyway, and substitute this data. The X11
757: * server, however, will ignore this fake data and use
758: * whatever authentication mechanisms it was using otherwise
759: * for the local connection.
760: */
761: if (!got_data) {
762: u_int32_t rand = 0;
763:
1.191 itojun 764: logit("Warning: No xauth data; using fake authentication data for X11 forwarding.");
1.150 stevesk 765: strlcpy(proto, "MIT-MAGIC-COOKIE-1", sizeof proto);
1.50 markus 766: for (i = 0; i < 16; i++) {
767: if (i % 4 == 0)
768: rand = arc4random();
1.150 stevesk 769: snprintf(data + 2 * i, sizeof data - 2 * i, "%02x", rand & 0xff);
1.50 markus 770: rand >>= 8;
771: }
772: }
773: }
774:
1.126 itojun 775: static void
1.70 markus 776: ssh_init_forwarding(void)
777: {
1.86 markus 778: int success = 0;
1.70 markus 779: int i;
1.86 markus 780:
1.70 markus 781: /* Initiate local TCP/IP port forwardings. */
782: for (i = 0; i < options.num_local_forwards; i++) {
783: debug("Connections to local port %d forwarded to remote address %.200s:%d",
784: options.local_forwards[i].port,
785: options.local_forwards[i].host,
786: options.local_forwards[i].host_port);
1.158 markus 787: success += channel_setup_local_fwd_listener(
1.70 markus 788: options.local_forwards[i].port,
789: options.local_forwards[i].host,
790: options.local_forwards[i].host_port,
791: options.gateway_ports);
792: }
1.86 markus 793: if (i > 0 && success == 0)
794: error("Could not request local forwarding.");
1.70 markus 795:
796: /* Initiate remote TCP/IP port forwardings. */
797: for (i = 0; i < options.num_remote_forwards; i++) {
798: debug("Connections to remote port %d forwarded to local address %.200s:%d",
799: options.remote_forwards[i].port,
800: options.remote_forwards[i].host,
801: options.remote_forwards[i].host_port);
802: channel_request_remote_forwarding(
803: options.remote_forwards[i].port,
804: options.remote_forwards[i].host,
805: options.remote_forwards[i].host_port);
806: }
807: }
808:
1.126 itojun 809: static void
1.70 markus 810: check_agent_present(void)
811: {
812: if (options.forward_agent) {
813: /* Clear agent forwarding if we don\'t have an agent. */
1.185 stevesk 814: if (!ssh_agent_present())
1.70 markus 815: options.forward_agent = 0;
816: }
817: }
818:
1.126 itojun 819: static int
1.45 markus 820: ssh_session(void)
821: {
822: int type;
823: int interactive = 0;
824: int have_tty = 0;
825: struct winsize ws;
826: char *cp;
827:
1.31 markus 828: /* Enable compression if requested. */
829: if (options.compression) {
830: debug("Requesting compression at level %d.", options.compression_level);
831:
832: if (options.compression_level < 1 || options.compression_level > 9)
833: fatal("Compression level must be from 1 (fast) to 9 (slow, best).");
834:
835: /* Send the request. */
836: packet_start(SSH_CMSG_REQUEST_COMPRESSION);
837: packet_put_int(options.compression_level);
838: packet_send();
839: packet_write_wait();
1.156 markus 840: type = packet_read();
1.31 markus 841: if (type == SSH_SMSG_SUCCESS)
842: packet_start_compression(options.compression_level);
843: else if (type == SSH_SMSG_FAILURE)
1.191 itojun 844: logit("Warning: Remote host refused compression.");
1.31 markus 845: else
846: packet_disconnect("Protocol error waiting for compression response.");
847: }
848: /* Allocate a pseudo tty if appropriate. */
849: if (tty_flag) {
850: debug("Requesting pty.");
851:
852: /* Start the packet. */
853: packet_start(SSH_CMSG_REQUEST_PTY);
854:
855: /* Store TERM in the packet. There is no limit on the
856: length of the string. */
857: cp = getenv("TERM");
858: if (!cp)
859: cp = "";
1.124 markus 860: packet_put_cstring(cp);
1.31 markus 861:
862: /* Store window size in the packet. */
863: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
864: memset(&ws, 0, sizeof(ws));
865: packet_put_int(ws.ws_row);
866: packet_put_int(ws.ws_col);
867: packet_put_int(ws.ws_xpixel);
868: packet_put_int(ws.ws_ypixel);
869:
870: /* Store tty modes in the packet. */
1.115 stevesk 871: tty_make_modes(fileno(stdin), NULL);
1.31 markus 872:
873: /* Send the packet, and wait for it to leave. */
874: packet_send();
875: packet_write_wait();
876:
877: /* Read response from the server. */
1.156 markus 878: type = packet_read();
1.43 markus 879: if (type == SSH_SMSG_SUCCESS) {
1.31 markus 880: interactive = 1;
1.45 markus 881: have_tty = 1;
1.43 markus 882: } else if (type == SSH_SMSG_FAILURE)
1.191 itojun 883: logit("Warning: Remote host failed or refused to allocate a pseudo tty.");
1.31 markus 884: else
885: packet_disconnect("Protocol error waiting for pty request response.");
886: }
887: /* Request X11 forwarding if enabled and DISPLAY is set. */
888: if (options.forward_x11 && getenv("DISPLAY") != NULL) {
1.150 stevesk 889: char *proto, *data;
1.50 markus 890: /* Get reasonable local authentication information. */
1.150 stevesk 891: x11_get_proto(&proto, &data);
1.50 markus 892: /* Request forwarding with authentication spoofing. */
1.31 markus 893: debug("Requesting X11 forwarding with authentication spoofing.");
1.50 markus 894: x11_request_forwarding_with_spoofing(0, proto, data);
1.31 markus 895:
896: /* Read response from the server. */
1.156 markus 897: type = packet_read();
1.31 markus 898: if (type == SSH_SMSG_SUCCESS) {
899: interactive = 1;
1.50 markus 900: } else if (type == SSH_SMSG_FAILURE) {
1.191 itojun 901: logit("Warning: Remote host denied X11 forwarding.");
1.50 markus 902: } else {
1.31 markus 903: packet_disconnect("Protocol error waiting for X11 forwarding");
1.50 markus 904: }
1.31 markus 905: }
906: /* Tell the packet module whether this is an interactive session. */
1.80 markus 907: packet_set_interactive(interactive);
1.31 markus 908:
909: /* Request authentication agent forwarding if appropriate. */
1.70 markus 910: check_agent_present();
911:
1.31 markus 912: if (options.forward_agent) {
913: debug("Requesting authentication agent forwarding.");
914: auth_request_forwarding();
915:
916: /* Read response from the server. */
1.156 markus 917: type = packet_read();
1.155 markus 918: packet_check_eom();
1.31 markus 919: if (type != SSH_SMSG_SUCCESS)
1.191 itojun 920: logit("Warning: Remote host denied authentication agent forwarding.");
1.31 markus 921: }
922:
1.70 markus 923: /* Initiate port forwardings. */
924: ssh_init_forwarding();
1.34 markus 925:
926: /* If requested, let ssh continue in the background. */
1.48 markus 927: if (fork_after_authentication_flag)
1.34 markus 928: if (daemon(1, 1) < 0)
929: fatal("daemon() failed: %.200s", strerror(errno));
1.31 markus 930:
1.33 markus 931: /*
932: * If a command was specified on the command line, execute the
933: * command now. Otherwise request the server to start a shell.
934: */
1.31 markus 935: if (buffer_len(&command) > 0) {
936: int len = buffer_len(&command);
937: if (len > 900)
938: len = 900;
1.152 stevesk 939: debug("Sending command: %.*s", len, (u_char *)buffer_ptr(&command));
1.31 markus 940: packet_start(SSH_CMSG_EXEC_CMD);
941: packet_put_string(buffer_ptr(&command), buffer_len(&command));
942: packet_send();
943: packet_write_wait();
944: } else {
945: debug("Requesting shell.");
946: packet_start(SSH_CMSG_EXEC_SHELL);
947: packet_send();
948: packet_write_wait();
949: }
950:
951: /* Enter the interactive session. */
1.119 stevesk 952: return client_loop(have_tty, tty_flag ?
953: options.escape_char : SSH_ESCAPECHAR_NONE, 0);
1.45 markus 954: }
955:
1.126 itojun 956: static void
1.157 markus 957: client_subsystem_reply(int type, u_int32_t seq, void *ctxt)
1.89 markus 958: {
959: int id, len;
960:
961: id = packet_get_int();
962: len = buffer_len(&command);
1.100 markus 963: if (len > 900)
964: len = 900;
1.155 markus 965: packet_check_eom();
1.89 markus 966: if (type == SSH2_MSG_CHANNEL_FAILURE)
967: fatal("Request for subsystem '%.*s' failed on channel %d",
1.152 stevesk 968: len, (u_char *)buffer_ptr(&command), id);
1.170 markus 969: }
970:
971: void
972: client_global_request_reply(int type, u_int32_t seq, void *ctxt)
973: {
974: int i;
975:
976: i = client_global_request_id++;
977: if (i >= options.num_remote_forwards) {
978: debug("client_global_request_reply: too many replies %d > %d",
979: i, options.num_remote_forwards);
980: return;
981: }
982: debug("remote forward %s for: listen %d, connect %s:%d",
983: type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
984: options.remote_forwards[i].port,
985: options.remote_forwards[i].host,
986: options.remote_forwards[i].host_port);
987: if (type == SSH2_MSG_REQUEST_FAILURE)
1.191 itojun 988: logit("Warning: remote port forwarding failed for listen port %d",
1.170 markus 989: options.remote_forwards[i].port);
1.89 markus 990: }
991:
1.143 markus 992: /* request pty/x11/agent/tcpfwd/shell for channel */
1.126 itojun 993: static void
1.143 markus 994: ssh_session2_setup(int id, void *arg)
1.45 markus 995: {
996: int len;
1.80 markus 997: int interactive = 0;
1.115 stevesk 998: struct termios tio;
1.80 markus 999:
1.187 markus 1000: debug2("ssh_session2_setup: id %d", id);
1.31 markus 1001:
1.45 markus 1002: if (tty_flag) {
1003: struct winsize ws;
1004: char *cp;
1005: cp = getenv("TERM");
1006: if (!cp)
1007: cp = "";
1008: /* Store window size in the packet. */
1009: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
1010: memset(&ws, 0, sizeof(ws));
1011:
1012: channel_request_start(id, "pty-req", 0);
1013: packet_put_cstring(cp);
1014: packet_put_int(ws.ws_col);
1015: packet_put_int(ws.ws_row);
1016: packet_put_int(ws.ws_xpixel);
1017: packet_put_int(ws.ws_ypixel);
1.115 stevesk 1018: tio = get_saved_tio();
1019: tty_make_modes(/*ignored*/ 0, &tio);
1.45 markus 1020: packet_send();
1.80 markus 1021: interactive = 1;
1.45 markus 1022: /* XXX wait for reply */
1023: }
1.50 markus 1024: if (options.forward_x11 &&
1025: getenv("DISPLAY") != NULL) {
1.150 stevesk 1026: char *proto, *data;
1.50 markus 1027: /* Get reasonable local authentication information. */
1.150 stevesk 1028: x11_get_proto(&proto, &data);
1.50 markus 1029: /* Request forwarding with authentication spoofing. */
1030: debug("Requesting X11 forwarding with authentication spoofing.");
1031: x11_request_forwarding_with_spoofing(id, proto, data);
1.80 markus 1032: interactive = 1;
1.50 markus 1033: /* XXX wait for reply */
1034: }
1035:
1.70 markus 1036: check_agent_present();
1037: if (options.forward_agent) {
1038: debug("Requesting authentication agent forwarding.");
1039: channel_request_start(id, "auth-agent-req@openssh.com", 0);
1040: packet_send();
1041: }
1042:
1.45 markus 1043: len = buffer_len(&command);
1044: if (len > 0) {
1045: if (len > 900)
1046: len = 900;
1.85 djm 1047: if (subsystem_flag) {
1.152 stevesk 1048: debug("Sending subsystem: %.*s", len, (u_char *)buffer_ptr(&command));
1.89 markus 1049: channel_request_start(id, "subsystem", /*want reply*/ 1);
1050: /* register callback for reply */
1.172 deraadt 1051: /* XXX we assume that client_loop has already been called */
1.89 markus 1052: dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &client_subsystem_reply);
1053: dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &client_subsystem_reply);
1.85 djm 1054: } else {
1.152 stevesk 1055: debug("Sending command: %.*s", len, (u_char *)buffer_ptr(&command));
1.85 djm 1056: channel_request_start(id, "exec", 0);
1057: }
1.100 markus 1058: packet_put_string(buffer_ptr(&command), buffer_len(&command));
1.45 markus 1059: packet_send();
1060: } else {
1.161 markus 1061: channel_request_start(id, "shell", 0);
1062: packet_send();
1.45 markus 1063: }
1.90 markus 1064:
1.80 markus 1065: packet_set_interactive(interactive);
1.45 markus 1066: }
1067:
1.143 markus 1068: /* open new channel for a session */
1.126 itojun 1069: static int
1.143 markus 1070: ssh_session2_open(void)
1.45 markus 1071: {
1.118 markus 1072: Channel *c;
1073: int window, packetmax, in, out, err;
1.60 markus 1074:
1.62 markus 1075: if (stdin_null_flag) {
1.93 itojun 1076: in = open(_PATH_DEVNULL, O_RDONLY);
1.62 markus 1077: } else {
1078: in = dup(STDIN_FILENO);
1079: }
1.60 markus 1080: out = dup(STDOUT_FILENO);
1081: err = dup(STDERR_FILENO);
1.45 markus 1082:
1083: if (in < 0 || out < 0 || err < 0)
1.62 markus 1084: fatal("dup() in/out/err failed");
1.45 markus 1085:
1.69 markus 1086: /* enable nonblocking unless tty */
1087: if (!isatty(in))
1088: set_nonblock(in);
1089: if (!isatty(out))
1090: set_nonblock(out);
1091: if (!isatty(err))
1092: set_nonblock(err);
1093:
1.65 markus 1094: window = CHAN_SES_WINDOW_DEFAULT;
1095: packetmax = CHAN_SES_PACKET_DEFAULT;
1.164 markus 1096: if (tty_flag) {
1097: window >>= 1;
1098: packetmax >>= 1;
1.45 markus 1099: }
1.118 markus 1100: c = channel_new(
1.45 markus 1101: "session", SSH_CHANNEL_OPENING, in, out, err,
1.65 markus 1102: window, packetmax, CHAN_EXTENDED_WRITE,
1.192 markus 1103: "client-session", /*nonblock*/0);
1.45 markus 1104:
1.143 markus 1105: debug3("ssh_session2_open: channel_new: %d", c->self);
1.106 markus 1106:
1.122 markus 1107: channel_send_open(c->self);
1.143 markus 1108: if (!no_shell_flag)
1.160 markus 1109: channel_register_confirm(c->self, ssh_session2_setup);
1.106 markus 1110:
1.118 markus 1111: return c->self;
1.106 markus 1112: }
1113:
1.126 itojun 1114: static int
1.106 markus 1115: ssh_session2(void)
1116: {
1.143 markus 1117: int id = -1;
1.106 markus 1118:
1119: /* XXX should be pre-session */
1120: ssh_init_forwarding();
1121:
1.143 markus 1122: if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN))
1123: id = ssh_session2_open();
1.106 markus 1124:
1125: /* If requested, let ssh continue in the background. */
1126: if (fork_after_authentication_flag)
1127: if (daemon(1, 1) < 0)
1128: fatal("daemon() failed: %.200s", strerror(errno));
1.31 markus 1129:
1.119 stevesk 1130: return client_loop(tty_flag, tty_flag ?
1131: options.escape_char : SSH_ESCAPECHAR_NONE, id);
1.72 markus 1132: }
1133:
1.126 itojun 1134: static void
1.104 markus 1135: load_public_identity_files(void)
1136: {
1137: char *filename;
1.167 markus 1138: int i = 0;
1.104 markus 1139: Key *public;
1.167 markus 1140: #ifdef SMARTCARD
1141: Key **keys;
1.104 markus 1142:
1.133 markus 1143: if (options.smartcard_device != NULL &&
1.167 markus 1144: options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
1145: (keys = sc_get_keys(options.smartcard_device, NULL)) != NULL ) {
1146: int count = 0;
1147: for (i = 0; keys[i] != NULL; i++) {
1148: count++;
1149: memmove(&options.identity_files[1], &options.identity_files[0],
1150: sizeof(char *) * (SSH_MAX_IDENTITY_FILES - 1));
1151: memmove(&options.identity_keys[1], &options.identity_keys[0],
1152: sizeof(Key *) * (SSH_MAX_IDENTITY_FILES - 1));
1153: options.num_identity_files++;
1154: options.identity_keys[0] = keys[i];
1.194 markus 1155: options.identity_files[0] = sc_get_key_label(keys[i]);
1.167 markus 1156: }
1.168 markus 1157: if (options.num_identity_files > SSH_MAX_IDENTITY_FILES)
1158: options.num_identity_files = SSH_MAX_IDENTITY_FILES;
1.167 markus 1159: i = count;
1160: xfree(keys);
1.127 markus 1161: }
1.136 jakob 1162: #endif /* SMARTCARD */
1.131 millert 1163: for (; i < options.num_identity_files; i++) {
1164: filename = tilde_expand_filename(options.identity_files[i],
1165: original_real_uid);
1166: public = key_load_public(filename, NULL);
1167: debug("identity file %s type %d", filename,
1168: public ? public->type : -1);
1169: xfree(options.identity_files[i]);
1170: options.identity_files[i] = filename;
1171: options.identity_keys[i] = public;
1172: }
1.1 deraadt 1173: }
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