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Damien Millerd4a8b7e1999-10-27 13:42:43 +10001/*
Damien Miller95def091999-11-25 00:26:21 +11002 * Author: Tatu Ylonen <ylo@cs.hut.fi>
3 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
4 * All rights reserved
Damien Miller95def091999-11-25 00:26:21 +11005 * 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 *
Damien Millere4340be2000-09-16 13:29:08 +11009 * 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.
Ben Lindstromeb041dc2002-03-27 17:20:38 +000016 * Copyright (c) 2000, 2001, 2002 Markus Friedl. All rights reserved.
Damien Millere4340be2000-09-16 13:29:08 +110017 *
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.
Damien Miller95def091999-11-25 00:26:21 +110040 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100041
42#include "includes.h"
Ben Lindstromee8d52d2002-07-23 21:03:02 +000043RCSID("$OpenBSD: ssh.c,v 1.182 2002/07/19 17:42:40 stevesk Exp $");
Damien Millereba71ba2000-04-29 23:57:08 +100044
45#include <openssl/evp.h>
Damien Miller0bc1bd82000-11-13 22:57:25 +110046#include <openssl/err.h>
Damien Millerd4a8b7e1999-10-27 13:42:43 +100047
Damien Millerd4a8b7e1999-10-27 13:42:43 +100048#include "ssh.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000049#include "ssh1.h"
Damien Miller1383bd82000-04-06 12:32:37 +100050#include "ssh2.h"
51#include "compat.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000052#include "cipher.h"
53#include "xmalloc.h"
54#include "packet.h"
55#include "buffer.h"
Ben Lindstromc7637672001-06-09 00:36:26 +000056#include "channels.h"
Damien Millereba71ba2000-04-29 23:57:08 +100057#include "key.h"
Damien Miller994cf142000-07-21 10:19:44 +100058#include "authfd.h"
Damien Millereba71ba2000-04-29 23:57:08 +100059#include "authfile.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000060#include "pathnames.h"
Ben Lindstrombf555ba2001-01-18 02:04:35 +000061#include "clientloop.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000062#include "log.h"
63#include "readconf.h"
64#include "sshconnect.h"
65#include "tildexpand.h"
Ben Lindstrom1e7d3062001-02-09 02:36:43 +000066#include "dispatch.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000067#include "misc.h"
Ben Lindstrom06b33aa2001-02-15 03:01:59 +000068#include "kex.h"
69#include "mac.h"
Ben Lindstromae8e2d32001-04-14 23:13:02 +000070#include "sshtty.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100071
Ben Lindstromc5b68002001-07-04 04:52:03 +000072#ifdef SMARTCARD
Ben Lindstromc5b68002001-07-04 04:52:03 +000073#include "scard.h"
Ben Lindstrombcc18082001-08-06 21:59:25 +000074#endif
Ben Lindstromc5b68002001-07-04 04:52:03 +000075
Damien Miller3f905871999-11-15 17:10:57 +110076#ifdef HAVE___PROGNAME
77extern char *__progname;
Ben Lindstrom49a79c02000-11-17 03:47:20 +000078#else
79char *__progname;
80#endif
Damien Miller3f905871999-11-15 17:10:57 +110081
Damien Miller34132e52000-01-14 15:45:46 +110082/* Flag indicating whether IPv4 or IPv6. This can be set on the command line.
83 Default value is AF_UNSPEC means both IPv4 and IPv6. */
Damien Miller7d80e342000-01-19 14:36:49 +110084#ifdef IPV4_DEFAULT
85int IPv4or6 = AF_INET;
86#else
Damien Miller34132e52000-01-14 15:45:46 +110087int IPv4or6 = AF_UNSPEC;
Damien Miller7d80e342000-01-19 14:36:49 +110088#endif
Damien Miller34132e52000-01-14 15:45:46 +110089
Damien Miller95def091999-11-25 00:26:21 +110090/* Flag indicating whether debug mode is on. This can be set on the command line. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100091int debug_flag = 0;
92
Damien Miller78928792000-04-12 20:17:38 +100093/* Flag indicating whether a tty should be allocated */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100094int tty_flag = 0;
Ben Lindstrom4dccfa52000-12-28 16:40:05 +000095int no_tty_flag = 0;
96int force_tty_flag = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100097
Damien Miller1383bd82000-04-06 12:32:37 +100098/* don't exec a shell */
99int no_shell_flag = 0;
Damien Miller1383bd82000-04-06 12:32:37 +1000100
Damien Miller5428f641999-11-25 11:54:57 +1100101/*
102 * Flag indicating that nothing should be read from stdin. This can be set
103 * on the command line.
104 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000105int stdin_null_flag = 0;
106
Damien Miller5428f641999-11-25 11:54:57 +1100107/*
108 * Flag indicating that ssh should fork after authentication. This is useful
Ben Lindstromf666fec2002-06-06 19:51:58 +0000109 * so that the passphrase can be entered manually, and then ssh goes to the
Damien Miller5428f641999-11-25 11:54:57 +1100110 * background.
111 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000112int fork_after_authentication_flag = 0;
113
Damien Miller5428f641999-11-25 11:54:57 +1100114/*
115 * General data structure for command line options and options configurable
116 * in configuration files. See readconf.h.
117 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000118Options options;
119
Ben Lindstrom14f31ab2001-09-12 17:48:04 +0000120/* optional user configfile */
121char *config = NULL;
122
Damien Miller5428f641999-11-25 11:54:57 +1100123/*
124 * Name of the host we are connecting to. This is the name given on the
125 * command line, or the HostName specified for the user-supplied name in a
126 * configuration file.
127 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000128char *host;
129
130/* socket address the host resolves to */
Damien Miller34132e52000-01-14 15:45:46 +1100131struct sockaddr_storage hostaddr;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000132
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000133/* Private host keys. */
Ben Lindstrom1bad2562002-06-06 19:57:33 +0000134Sensitive sensitive_data;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000135
136/* Original real UID. */
137uid_t original_real_uid;
Ben Lindstromf9c48842002-06-11 16:37:51 +0000138uid_t original_effective_uid;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000139
Damien Miller1383bd82000-04-06 12:32:37 +1000140/* command to be executed */
141Buffer command;
142
Damien Miller832562e2001-01-30 09:30:01 +1100143/* Should we execute a command or invoke a subsystem? */
144int subsystem_flag = 0;
145
Damien Miller2797f7f2002-04-23 21:09:44 +1000146/* # of replies received for global requests */
147static int client_global_request_id = 0;
148
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000149/* Prints a help message to the user. This function never returns. */
150
Ben Lindstrombba81212001-06-25 05:01:22 +0000151static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000152usage(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000153{
Kevin Stevesec84dc12000-12-13 17:45:15 +0000154 fprintf(stderr, "Usage: %s [options] host [command]\n", __progname);
Damien Miller95def091999-11-25 00:26:21 +1100155 fprintf(stderr, "Options:\n");
156 fprintf(stderr, " -l user Log in using this user name.\n");
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000157 fprintf(stderr, " -n Redirect input from " _PATH_DEVNULL ".\n");
Ben Lindstrom14f31ab2001-09-12 17:48:04 +0000158 fprintf(stderr, " -F config Config file (default: ~/%s).\n",
159 _PATH_SSH_USER_CONFFILE);
Damien Millerb1715dc2000-05-30 13:44:51 +1000160 fprintf(stderr, " -A Enable authentication agent forwarding.\n");
Ben Lindstrom3b89c5e2001-06-05 20:44:16 +0000161 fprintf(stderr, " -a Disable authentication agent forwarding (default).\n");
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000162#ifdef AFS
Damien Miller95def091999-11-25 00:26:21 +1100163 fprintf(stderr, " -k Disable Kerberos ticket and AFS token forwarding.\n");
164#endif /* AFS */
Kevin Stevesef4eea92001-02-05 12:42:17 +0000165 fprintf(stderr, " -X Enable X11 connection forwarding.\n");
Ben Lindstrom3b89c5e2001-06-05 20:44:16 +0000166 fprintf(stderr, " -x Disable X11 connection forwarding (default).\n");
Ben Lindstrom0ab2a012001-03-05 06:45:21 +0000167 fprintf(stderr, " -i file Identity for public key authentication "
168 "(default: ~/.ssh/identity)\n");
Ben Lindstrom61eb9562001-08-06 21:53:42 +0000169#ifdef SMARTCARD
170 fprintf(stderr, " -I reader Set smartcard reader.\n");
Ben Lindstrombcc18082001-08-06 21:59:25 +0000171#endif
Damien Miller95def091999-11-25 00:26:21 +1100172 fprintf(stderr, " -t Tty; allocate a tty even if command is given.\n");
Damien Miller1383bd82000-04-06 12:32:37 +1000173 fprintf(stderr, " -T Do not allocate a tty.\n");
Damien Miller95def091999-11-25 00:26:21 +1100174 fprintf(stderr, " -v Verbose; display verbose debugging messages.\n");
Damien Millere4340be2000-09-16 13:29:08 +1100175 fprintf(stderr, " Multiple -v increases verbosity.\n");
Damien Miller95def091999-11-25 00:26:21 +1100176 fprintf(stderr, " -V Display version number only.\n");
177 fprintf(stderr, " -P Don't allocate a privileged port.\n");
178 fprintf(stderr, " -q Quiet; don't display any warning messages.\n");
179 fprintf(stderr, " -f Fork into background after authentication.\n");
180 fprintf(stderr, " -e char Set escape character; ``none'' = disable (default: ~).\n");
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000181
Ben Lindstrom3b89c5e2001-06-05 20:44:16 +0000182 fprintf(stderr, " -c cipher Select encryption algorithm\n");
Ben Lindstrom3d73a342001-03-05 07:39:01 +0000183 fprintf(stderr, " -m macs Specify MAC algorithms for protocol version 2.\n");
Damien Miller95def091999-11-25 00:26:21 +1100184 fprintf(stderr, " -p port Connect to this port. Server must be on the same port.\n");
185 fprintf(stderr, " -L listen-port:host:port Forward local port to remote address\n");
186 fprintf(stderr, " -R listen-port:host:port Forward remote port to local address\n");
Kevin Stevesec84dc12000-12-13 17:45:15 +0000187 fprintf(stderr, " These cause %s to listen for connections on a port, and\n", __progname);
Damien Miller95def091999-11-25 00:26:21 +1100188 fprintf(stderr, " forward them to the other side by connecting to host:port.\n");
Ben Lindstrom19ceb172001-09-12 17:54:24 +0000189 fprintf(stderr, " -D port Enable dynamic application-level port forwarding.\n");
Damien Miller95def091999-11-25 00:26:21 +1100190 fprintf(stderr, " -C Enable compression.\n");
Damien Miller1383bd82000-04-06 12:32:37 +1000191 fprintf(stderr, " -N Do not execute a shell or command.\n");
Damien Miller95def091999-11-25 00:26:21 +1100192 fprintf(stderr, " -g Allow remote hosts to connect to forwarded ports.\n");
Ben Lindstrom1e7d3062001-02-09 02:36:43 +0000193 fprintf(stderr, " -1 Force protocol version 1.\n");
194 fprintf(stderr, " -2 Force protocol version 2.\n");
Damien Miller34132e52000-01-14 15:45:46 +1100195 fprintf(stderr, " -4 Use IPv4 only.\n");
196 fprintf(stderr, " -6 Use IPv6 only.\n");
Damien Miller95def091999-11-25 00:26:21 +1100197 fprintf(stderr, " -o 'option' Process the option as if it was read from a configuration file.\n");
Damien Miller832562e2001-01-30 09:30:01 +1100198 fprintf(stderr, " -s Invoke command (mandatory) as SSH2 subsystem.\n");
Ben Lindstrom3b89c5e2001-06-05 20:44:16 +0000199 fprintf(stderr, " -b addr Local IP address.\n");
Damien Miller95def091999-11-25 00:26:21 +1100200 exit(1);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000201}
202
Ben Lindstrombba81212001-06-25 05:01:22 +0000203static int ssh_session(void);
204static int ssh_session2(void);
205static void load_public_identity_files(void);
Damien Miller1383bd82000-04-06 12:32:37 +1000206
Damien Miller95def091999-11-25 00:26:21 +1100207/*
208 * Main program for the ssh client.
209 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000210int
211main(int ac, char **av)
212{
Ben Lindstrom24157572002-06-12 16:09:39 +0000213 int i, opt, exit_status;
Damien Milleraae6c611999-12-06 11:47:28 +1100214 u_short fwd_port, fwd_host_port;
Ben Lindstrom1a174712001-09-12 17:56:15 +0000215 char sfwd_port[6], sfwd_host_port[6];
Damien Millerf4614452001-07-14 12:18:10 +1000216 char *p, *cp, buf[256];
Damien Miller95def091999-11-25 00:26:21 +1100217 struct stat st;
Ben Lindstrom086cf212001-03-05 05:56:40 +0000218 struct passwd *pw;
Damien Miller1383bd82000-04-06 12:32:37 +1000219 int dummy;
Ben Lindstrom5ccf63a2001-09-24 20:00:10 +0000220 extern int optind, optreset;
Damien Miller4f8e6692001-07-14 13:22:53 +1000221 extern char *optarg;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000222
Ben Lindstrom49a79c02000-11-17 03:47:20 +0000223 __progname = get_progname(av[0]);
Damien Millerf9b625c2000-07-09 22:42:32 +1000224 init_rng();
225
Damien Miller5428f641999-11-25 11:54:57 +1100226 /*
227 * Save the original real uid. It will be needed later (uid-swapping
228 * may clobber the real uid).
229 */
Damien Miller95def091999-11-25 00:26:21 +1100230 original_real_uid = getuid();
231 original_effective_uid = geteuid();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000232
Damien Miller05dd7952000-10-01 00:42:48 +1100233#ifdef HAVE_SETRLIMIT
Damien Miller95def091999-11-25 00:26:21 +1100234 /* If we are installed setuid root be careful to not drop core. */
235 if (original_real_uid != original_effective_uid) {
236 struct rlimit rlim;
237 rlim.rlim_cur = rlim.rlim_max = 0;
238 if (setrlimit(RLIMIT_CORE, &rlim) < 0)
239 fatal("setrlimit failed: %.100s", strerror(errno));
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000240 }
Damien Millerbac2d8a2000-09-05 16:13:06 +1100241#endif
Ben Lindstrom3fcf1a22001-04-08 18:26:59 +0000242 /* Get user data. */
243 pw = getpwuid(original_real_uid);
244 if (!pw) {
245 log("You don't exist, go away!");
246 exit(1);
247 }
248 /* Take a copy of the returned structure. */
249 pw = pwcopy(pw);
250
Damien Miller5428f641999-11-25 11:54:57 +1100251 /*
252 * Use uid-swapping to give up root privileges for the duration of
253 * option processing. We will re-instantiate the rights when we are
254 * ready to create the privileged port, and will permanently drop
255 * them when the port has been created (actually, when the connection
256 * has been made, as we may need to create the port several times).
257 */
Ben Lindstromf9c48842002-06-11 16:37:51 +0000258 PRIV_END;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000259
Damien Miller5428f641999-11-25 11:54:57 +1100260 /*
261 * Set our umask to something reasonable, as some files are created
262 * with the default umask. This will make them world-readable but
263 * writable only by the owner, which is ok for all files for which we
264 * don't set the modes explicitly.
265 */
Damien Miller95def091999-11-25 00:26:21 +1100266 umask(022);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000267
Damien Miller95def091999-11-25 00:26:21 +1100268 /* Initialize option structure to indicate that no values have been set. */
269 initialize_options(&options);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000270
Damien Miller95def091999-11-25 00:26:21 +1100271 /* Parse command-line arguments. */
272 host = NULL;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000273
Damien Millerf4614452001-07-14 12:18:10 +1000274again:
275 while ((opt = getopt(ac, av,
Ben Lindstrom14f31ab2001-09-12 17:48:04 +0000276 "1246ab:c:e:fgi:kl:m:no:p:qstvxACD:F:I:L:NPR:TVX")) != -1) {
Damien Miller95def091999-11-25 00:26:21 +1100277 switch (opt) {
Ben Lindstrom1e7d3062001-02-09 02:36:43 +0000278 case '1':
279 options.protocol = SSH_PROTO_1;
280 break;
Damien Miller4af51302000-04-16 11:18:38 +1000281 case '2':
282 options.protocol = SSH_PROTO_2;
283 break;
Damien Miller34132e52000-01-14 15:45:46 +1100284 case '4':
285 IPv4or6 = AF_INET;
286 break;
Damien Miller34132e52000-01-14 15:45:46 +1100287 case '6':
288 IPv4or6 = AF_INET6;
289 break;
Damien Miller95def091999-11-25 00:26:21 +1100290 case 'n':
291 stdin_null_flag = 1;
292 break;
Damien Miller95def091999-11-25 00:26:21 +1100293 case 'f':
294 fork_after_authentication_flag = 1;
295 stdin_null_flag = 1;
296 break;
Damien Miller95def091999-11-25 00:26:21 +1100297 case 'x':
298 options.forward_x11 = 0;
299 break;
Damien Miller95def091999-11-25 00:26:21 +1100300 case 'X':
301 options.forward_x11 = 1;
302 break;
Damien Miller95def091999-11-25 00:26:21 +1100303 case 'g':
304 options.gateway_ports = 1;
305 break;
Damien Miller95def091999-11-25 00:26:21 +1100306 case 'P':
307 options.use_privileged_port = 0;
308 break;
Damien Miller95def091999-11-25 00:26:21 +1100309 case 'a':
310 options.forward_agent = 0;
311 break;
Damien Millerb1715dc2000-05-30 13:44:51 +1000312 case 'A':
313 options.forward_agent = 1;
314 break;
Damien Miller95def091999-11-25 00:26:21 +1100315#ifdef AFS
316 case 'k':
317 options.kerberos_tgt_passing = 0;
318 options.afs_token_passing = 0;
319 break;
320#endif
321 case 'i':
322 if (stat(optarg, &st) < 0) {
Damien Millerf4614452001-07-14 12:18:10 +1000323 fprintf(stderr, "Warning: Identity file %s "
324 "does not exist.\n", optarg);
Damien Miller95def091999-11-25 00:26:21 +1100325 break;
326 }
Damien Millerf4614452001-07-14 12:18:10 +1000327 if (options.num_identity_files >=
328 SSH_MAX_IDENTITY_FILES)
329 fatal("Too many identity files specified "
330 "(max %d)", SSH_MAX_IDENTITY_FILES);
331 options.identity_files[options.num_identity_files++] =
332 xstrdup(optarg);
Damien Miller95def091999-11-25 00:26:21 +1100333 break;
Ben Lindstromc5b68002001-07-04 04:52:03 +0000334 case 'I':
335#ifdef SMARTCARD
Ben Lindstromf7db3bb2001-08-06 21:35:51 +0000336 options.smartcard_device = xstrdup(optarg);
Ben Lindstrombcc18082001-08-06 21:59:25 +0000337#else
Ben Lindstromc5b68002001-07-04 04:52:03 +0000338 fprintf(stderr, "no support for smartcards.\n");
Ben Lindstrombcc18082001-08-06 21:59:25 +0000339#endif
Ben Lindstromc5b68002001-07-04 04:52:03 +0000340 break;
Damien Miller95def091999-11-25 00:26:21 +1100341 case 't':
Ben Lindstrom4dccfa52000-12-28 16:40:05 +0000342 if (tty_flag)
343 force_tty_flag = 1;
Damien Miller95def091999-11-25 00:26:21 +1100344 tty_flag = 1;
345 break;
Damien Miller95def091999-11-25 00:26:21 +1100346 case 'v':
Damien Millere4340be2000-09-16 13:29:08 +1100347 if (0 == debug_flag) {
348 debug_flag = 1;
349 options.log_level = SYSLOG_LEVEL_DEBUG1;
350 } else if (options.log_level < SYSLOG_LEVEL_DEBUG3) {
351 options.log_level++;
352 break;
Damien Millerf4614452001-07-14 12:18:10 +1000353 } else
Ben Lindstrom6df8ef42001-03-05 07:47:23 +0000354 fatal("Too high debugging level.");
Damien Millere4340be2000-09-16 13:29:08 +1100355 /* fallthrough */
Damien Miller95def091999-11-25 00:26:21 +1100356 case 'V':
Damien Miller225736c2001-02-19 21:51:08 +1100357 fprintf(stderr,
358 "%s, SSH protocols %d.%d/%d.%d, OpenSSL 0x%8.8lx\n",
Damien Miller78928792000-04-12 20:17:38 +1000359 SSH_VERSION,
360 PROTOCOL_MAJOR_1, PROTOCOL_MINOR_1,
Damien Miller225736c2001-02-19 21:51:08 +1100361 PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2,
362 SSLeay());
Damien Miller95def091999-11-25 00:26:21 +1100363 if (opt == 'V')
364 exit(0);
Damien Miller95def091999-11-25 00:26:21 +1100365 break;
Damien Miller95def091999-11-25 00:26:21 +1100366 case 'q':
367 options.log_level = SYSLOG_LEVEL_QUIET;
368 break;
Damien Miller95def091999-11-25 00:26:21 +1100369 case 'e':
370 if (optarg[0] == '^' && optarg[2] == 0 &&
Damien Millerf4614452001-07-14 12:18:10 +1000371 (u_char) optarg[1] >= 64 &&
372 (u_char) optarg[1] < 128)
Ben Lindstrom46c16222000-12-22 01:43:59 +0000373 options.escape_char = (u_char) optarg[1] & 31;
Damien Miller95def091999-11-25 00:26:21 +1100374 else if (strlen(optarg) == 1)
Ben Lindstrom46c16222000-12-22 01:43:59 +0000375 options.escape_char = (u_char) optarg[0];
Damien Miller95def091999-11-25 00:26:21 +1100376 else if (strcmp(optarg, "none") == 0)
Ben Lindstrom2b1f71b2001-06-05 20:32:21 +0000377 options.escape_char = SSH_ESCAPECHAR_NONE;
Damien Miller95def091999-11-25 00:26:21 +1100378 else {
Damien Millerf4614452001-07-14 12:18:10 +1000379 fprintf(stderr, "Bad escape character '%s'.\n",
380 optarg);
Damien Miller95def091999-11-25 00:26:21 +1100381 exit(1);
382 }
383 break;
Damien Miller95def091999-11-25 00:26:21 +1100384 case 'c':
Damien Millereba71ba2000-04-29 23:57:08 +1000385 if (ciphers_valid(optarg)) {
386 /* SSH2 only */
387 options.ciphers = xstrdup(optarg);
Damien Miller30c3d422000-05-09 11:02:59 +1000388 options.cipher = SSH_CIPHER_ILLEGAL;
Damien Millereba71ba2000-04-29 23:57:08 +1000389 } else {
390 /* SSH1 only */
Damien Millere39cacc2000-11-29 12:18:44 +1100391 options.cipher = cipher_number(optarg);
392 if (options.cipher == -1) {
Damien Millerf4614452001-07-14 12:18:10 +1000393 fprintf(stderr,
394 "Unknown cipher type '%s'\n",
395 optarg);
Damien Millereba71ba2000-04-29 23:57:08 +1000396 exit(1);
397 }
Damien Millerf4614452001-07-14 12:18:10 +1000398 if (options.cipher == SSH_CIPHER_3DES)
Damien Millere39cacc2000-11-29 12:18:44 +1100399 options.ciphers = "3des-cbc";
Damien Millerf4614452001-07-14 12:18:10 +1000400 else if (options.cipher == SSH_CIPHER_BLOWFISH)
Damien Millere39cacc2000-11-29 12:18:44 +1100401 options.ciphers = "blowfish-cbc";
Damien Millerf4614452001-07-14 12:18:10 +1000402 else
Damien Millere39cacc2000-11-29 12:18:44 +1100403 options.ciphers = (char *)-1;
Damien Miller95def091999-11-25 00:26:21 +1100404 }
405 break;
Ben Lindstrom06b33aa2001-02-15 03:01:59 +0000406 case 'm':
407 if (mac_valid(optarg))
408 options.macs = xstrdup(optarg);
409 else {
Damien Millerf4614452001-07-14 12:18:10 +1000410 fprintf(stderr, "Unknown mac type '%s'\n",
411 optarg);
Ben Lindstrom06b33aa2001-02-15 03:01:59 +0000412 exit(1);
413 }
414 break;
Damien Miller95def091999-11-25 00:26:21 +1100415 case 'p':
Ben Lindstrom19066a12001-04-12 23:39:26 +0000416 options.port = a2port(optarg);
417 if (options.port == 0) {
Ben Lindstrom146edb92001-04-11 23:06:28 +0000418 fprintf(stderr, "Bad port '%s'\n", optarg);
419 exit(1);
420 }
Damien Miller95def091999-11-25 00:26:21 +1100421 break;
Damien Miller95def091999-11-25 00:26:21 +1100422 case 'l':
423 options.user = optarg;
424 break;
Ben Lindstrom1a174712001-09-12 17:56:15 +0000425
Damien Miller95def091999-11-25 00:26:21 +1100426 case 'L':
Ben Lindstrom1a174712001-09-12 17:56:15 +0000427 case 'R':
428 if (sscanf(optarg, "%5[0-9]:%255[^:]:%5[0-9]",
429 sfwd_port, buf, sfwd_host_port) != 3 &&
430 sscanf(optarg, "%5[0-9]/%255[^/]/%5[0-9]",
431 sfwd_port, buf, sfwd_host_port) != 3) {
Damien Millerf4614452001-07-14 12:18:10 +1000432 fprintf(stderr,
Ben Lindstrom1a174712001-09-12 17:56:15 +0000433 "Bad forwarding specification '%s'\n",
Damien Millerf4614452001-07-14 12:18:10 +1000434 optarg);
Damien Miller95def091999-11-25 00:26:21 +1100435 usage();
436 /* NOTREACHED */
437 }
Ben Lindstrom1a174712001-09-12 17:56:15 +0000438 if ((fwd_port = a2port(sfwd_port)) == 0 ||
Ben Lindstrom6328ab32002-03-22 02:54:23 +0000439 (fwd_host_port = a2port(sfwd_host_port)) == 0) {
Ben Lindstrom1a174712001-09-12 17:56:15 +0000440 fprintf(stderr,
441 "Bad forwarding port(s) '%s'\n", optarg);
442 exit(1);
443 }
444 if (opt == 'L')
445 add_local_forward(&options, fwd_port, buf,
446 fwd_host_port);
447 else if (opt == 'R')
448 add_remote_forward(&options, fwd_port, buf,
Damien Miller9f0f5c62001-12-21 14:45:46 +1100449 fwd_host_port);
Damien Miller95def091999-11-25 00:26:21 +1100450 break;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000451
452 case 'D':
Ben Lindstrom19066a12001-04-12 23:39:26 +0000453 fwd_port = a2port(optarg);
454 if (fwd_port == 0) {
Damien Millerf4614452001-07-14 12:18:10 +1000455 fprintf(stderr, "Bad dynamic port '%s'\n",
456 optarg);
Ben Lindstrom146edb92001-04-11 23:06:28 +0000457 exit(1);
458 }
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000459 add_local_forward(&options, fwd_port, "socks4", 0);
460 break;
461
Damien Miller95def091999-11-25 00:26:21 +1100462 case 'C':
463 options.compression = 1;
464 break;
Damien Miller1383bd82000-04-06 12:32:37 +1000465 case 'N':
466 no_shell_flag = 1;
467 no_tty_flag = 1;
468 break;
Damien Miller1383bd82000-04-06 12:32:37 +1000469 case 'T':
470 no_tty_flag = 1;
471 break;
Damien Miller95def091999-11-25 00:26:21 +1100472 case 'o':
473 dummy = 1;
Damien Millerf4614452001-07-14 12:18:10 +1000474 if (process_config_line(&options, host ? host : "",
475 optarg, "command-line", 0, &dummy) != 0)
Damien Miller95def091999-11-25 00:26:21 +1100476 exit(1);
477 break;
Damien Miller832562e2001-01-30 09:30:01 +1100478 case 's':
479 subsystem_flag = 1;
480 break;
Ben Lindstrome0f88042001-04-30 13:06:24 +0000481 case 'b':
482 options.bind_address = optarg;
483 break;
Ben Lindstrom14f31ab2001-09-12 17:48:04 +0000484 case 'F':
485 config = optarg;
486 break;
Damien Miller95def091999-11-25 00:26:21 +1100487 default:
488 usage();
489 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000490 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000491
Damien Millerf4614452001-07-14 12:18:10 +1000492 ac -= optind;
493 av += optind;
494
495 if (ac > 0 && !host && **av != '-') {
496 if (strchr(*av, '@')) {
497 p = xstrdup(*av);
498 cp = strchr(p, '@');
499 if (cp == NULL || cp == p)
500 usage();
501 options.user = p;
502 *cp = '\0';
503 host = ++cp;
504 } else
505 host = *av;
506 ac--, av++;
507 if (ac > 0) {
508 optind = 0;
509 optreset = 1;
510 goto again;
511 }
512 }
513
Damien Miller95def091999-11-25 00:26:21 +1100514 /* Check that we got a host name. */
515 if (!host)
516 usage();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000517
Damien Millercb5e44a2000-09-29 12:12:36 +1100518 SSLeay_add_all_algorithms();
Damien Miller0bc1bd82000-11-13 22:57:25 +1100519 ERR_load_crypto_strings();
Ben Lindstrom908afed2001-10-03 17:34:59 +0000520 channel_set_af(IPv4or6);
Damien Millercb5e44a2000-09-29 12:12:36 +1100521
Damien Miller95def091999-11-25 00:26:21 +1100522 /* Initialize the command to execute on remote host. */
523 buffer_init(&command);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000524
Damien Miller5428f641999-11-25 11:54:57 +1100525 /*
526 * Save the command to execute on the remote host in a buffer. There
527 * is no limit on the length of the command, except by the maximum
528 * packet size. Also sets the tty flag if there is no command.
529 */
Damien Millerf4614452001-07-14 12:18:10 +1000530 if (!ac) {
Damien Miller95def091999-11-25 00:26:21 +1100531 /* No command specified - execute shell on a tty. */
532 tty_flag = 1;
Damien Miller832562e2001-01-30 09:30:01 +1100533 if (subsystem_flag) {
Damien Millerf4614452001-07-14 12:18:10 +1000534 fprintf(stderr,
535 "You must specify a subsystem to invoke.\n");
Damien Miller832562e2001-01-30 09:30:01 +1100536 usage();
537 }
Damien Miller95def091999-11-25 00:26:21 +1100538 } else {
Damien Millerf4614452001-07-14 12:18:10 +1000539 /* A command has been specified. Store it into the buffer. */
540 for (i = 0; i < ac; i++) {
541 if (i)
Damien Miller95def091999-11-25 00:26:21 +1100542 buffer_append(&command, " ", 1);
543 buffer_append(&command, av[i], strlen(av[i]));
544 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000545 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000546
Damien Miller95def091999-11-25 00:26:21 +1100547 /* Cannot fork to background if no command. */
Damien Millercaf6dd62000-08-29 11:33:50 +1100548 if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag)
Damien Miller95def091999-11-25 00:26:21 +1100549 fatal("Cannot fork into background without a command to execute.");
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000550
Damien Miller95def091999-11-25 00:26:21 +1100551 /* Allocate a tty by default if no command specified. */
552 if (buffer_len(&command) == 0)
553 tty_flag = 1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000554
Ben Lindstroma962c2f2002-07-04 00:14:17 +0000555 /* Force no tty */
Ben Lindstromc72745a2000-12-02 19:03:54 +0000556 if (no_tty_flag)
557 tty_flag = 0;
Damien Miller95def091999-11-25 00:26:21 +1100558 /* Do not allocate a tty if stdin is not a tty. */
Ben Lindstrom4dccfa52000-12-28 16:40:05 +0000559 if (!isatty(fileno(stdin)) && !force_tty_flag) {
Damien Miller95def091999-11-25 00:26:21 +1100560 if (tty_flag)
Ben Lindstrom6df8ef42001-03-05 07:47:23 +0000561 log("Pseudo-terminal will not be allocated because stdin is not a terminal.");
Damien Miller95def091999-11-25 00:26:21 +1100562 tty_flag = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000563 }
Damien Miller1383bd82000-04-06 12:32:37 +1000564
Ben Lindstrom8a432f52001-03-05 07:24:46 +0000565 /*
566 * Initialize "log" output. Since we are the client all output
567 * actually goes to stderr.
568 */
Ben Lindstrom2b646522001-04-12 16:16:57 +0000569 log_init(av[0], options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level,
570 SYSLOG_FACILITY_USER, 1);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000571
Ben Lindstrom14f31ab2001-09-12 17:48:04 +0000572 /*
573 * Read per-user configuration file. Ignore the system wide config
574 * file if the user specifies a config file on the command line.
575 */
576 if (config != NULL) {
Ben Lindstromedc0cf22001-09-12 18:32:20 +0000577 if (!read_config_file(config, host, &options))
578 fatal("Can't open user config file %.100s: "
579 "%.100s", config, strerror(errno));
Ben Lindstrom14f31ab2001-09-12 17:48:04 +0000580 } else {
581 snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir,
582 _PATH_SSH_USER_CONFFILE);
Ben Lindstromedc0cf22001-09-12 18:32:20 +0000583 (void)read_config_file(buf, host, &options);
Ben Lindstrom83f07d12001-10-03 17:22:29 +0000584
585 /* Read systemwide configuration file after use config. */
586 (void)read_config_file(_PATH_HOST_CONFIG_FILE, host, &options);
Ben Lindstrom14f31ab2001-09-12 17:48:04 +0000587 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000588
Damien Miller95def091999-11-25 00:26:21 +1100589 /* Fill configuration defaults. */
590 fill_default_options(&options);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000591
Damien Miller95def091999-11-25 00:26:21 +1100592 /* reinit */
Ben Lindstrom8a432f52001-03-05 07:24:46 +0000593 log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 1);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000594
Damien Miller60bc5172001-03-19 09:38:15 +1100595 seed_rng();
596
Damien Miller95def091999-11-25 00:26:21 +1100597 if (options.user == NULL)
598 options.user = xstrdup(pw->pw_name);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000599
Damien Miller95def091999-11-25 00:26:21 +1100600 if (options.hostname != NULL)
601 host = options.hostname;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000602
Damien Miller95def091999-11-25 00:26:21 +1100603 /* Disable rhosts authentication if not running as root. */
Damien Millerbac2d8a2000-09-05 16:13:06 +1100604#ifdef HAVE_CYGWIN
605 /* Ignore uid if running under Windows */
606 if (!options.use_privileged_port) {
607#else
Damien Miller95def091999-11-25 00:26:21 +1100608 if (original_effective_uid != 0 || !options.use_privileged_port) {
Damien Millerbac2d8a2000-09-05 16:13:06 +1100609#endif
Kevin Stevesfcec7f82000-12-15 19:55:48 +0000610 debug("Rhosts Authentication disabled, "
611 "originating port will not be trusted.");
Damien Miller95def091999-11-25 00:26:21 +1100612 options.rhosts_authentication = 0;
Damien Miller95def091999-11-25 00:26:21 +1100613 }
Kevin Stevesfcec7f82000-12-15 19:55:48 +0000614 /* Open a connection to the remote host. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000615
Ben Lindstrom24157572002-06-12 16:09:39 +0000616 if (ssh_connect(host, &hostaddr, options.port, IPv4or6,
Kevin Stevesfcec7f82000-12-15 19:55:48 +0000617 options.connection_attempts,
Ben Lindstrom1aa64272002-06-11 20:28:05 +0000618#ifdef HAVE_CYGWIN
619 options.use_privileged_port,
620#else
Ben Lindstromf9c48842002-06-11 16:37:51 +0000621 original_effective_uid == 0 && options.use_privileged_port,
Ben Lindstrom1aa64272002-06-11 20:28:05 +0000622#endif
Ben Lindstromda394ca2002-06-12 16:11:12 +0000623 options.proxy_command) != 0)
Ben Lindstrom24157572002-06-12 16:09:39 +0000624 exit(1);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000625
Damien Miller5428f641999-11-25 11:54:57 +1100626 /*
627 * If we successfully made the connection, load the host private key
628 * in case we will need it later for combined rsa-rhosts
629 * authentication. This must be done before releasing extra
630 * privileges, because the file is only readable by root.
Ben Lindstrom9e5bb572002-06-06 19:58:27 +0000631 * If we cannot access the private keys, load the public keys
632 * instead and try to execute the ssh-keysign helper instead.
Damien Miller5428f641999-11-25 11:54:57 +1100633 */
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000634 sensitive_data.nkeys = 0;
635 sensitive_data.keys = NULL;
Ben Lindstrom1bad2562002-06-06 19:57:33 +0000636 sensitive_data.external_keysign = 0;
Ben Lindstrom24157572002-06-12 16:09:39 +0000637 if (options.rhosts_rsa_authentication ||
638 options.hostbased_authentication) {
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000639 sensitive_data.nkeys = 3;
Ben Lindstroma962c2f2002-07-04 00:14:17 +0000640 sensitive_data.keys = xmalloc(sensitive_data.nkeys *
641 sizeof(Key));
Ben Lindstromf9c48842002-06-11 16:37:51 +0000642
643 PRIV_START;
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000644 sensitive_data.keys[0] = key_load_private_type(KEY_RSA1,
Ben Lindstromd0fca422001-03-26 13:44:06 +0000645 _PATH_HOST_KEY_FILE, "", NULL);
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000646 sensitive_data.keys[1] = key_load_private_type(KEY_DSA,
647 _PATH_HOST_DSA_KEY_FILE, "", NULL);
648 sensitive_data.keys[2] = key_load_private_type(KEY_RSA,
649 _PATH_HOST_RSA_KEY_FILE, "", NULL);
Ben Lindstromf9c48842002-06-11 16:37:51 +0000650 PRIV_END;
Ben Lindstrom1bad2562002-06-06 19:57:33 +0000651
Ben Lindstrom5d35a2f2002-07-04 00:19:40 +0000652 if (options.hostbased_authentication == 1 &&
653 sensitive_data.keys[0] == NULL &&
Ben Lindstrom1bad2562002-06-06 19:57:33 +0000654 sensitive_data.keys[1] == NULL &&
655 sensitive_data.keys[2] == NULL) {
656 sensitive_data.keys[1] = key_load_public(
657 _PATH_HOST_DSA_KEY_FILE, NULL);
658 sensitive_data.keys[2] = key_load_public(
659 _PATH_HOST_RSA_KEY_FILE, NULL);
660 sensitive_data.external_keysign = 1;
661 }
Damien Miller95def091999-11-25 00:26:21 +1100662 }
Damien Miller5428f641999-11-25 11:54:57 +1100663 /*
664 * Get rid of any extra privileges that we may have. We will no
665 * longer need them. Also, extra privileges could make it very hard
666 * to read identity files and other non-world-readable files from the
667 * user's home directory if it happens to be on a NFS volume where
668 * root is mapped to nobody.
669 */
Ben Lindstromf9c48842002-06-11 16:37:51 +0000670 seteuid(original_real_uid);
671 setuid(original_real_uid);
Damien Miller95def091999-11-25 00:26:21 +1100672
Damien Miller5428f641999-11-25 11:54:57 +1100673 /*
674 * Now that we are back to our own permissions, create ~/.ssh
675 * directory if it doesn\'t already exist.
676 */
Ben Lindstrom930b14a2001-08-15 23:19:21 +0000677 snprintf(buf, sizeof buf, "%.100s%s%.100s", pw->pw_dir, strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR);
Damien Miller95def091999-11-25 00:26:21 +1100678 if (stat(buf, &st) < 0)
Damien Millerbe484b52000-07-15 14:14:16 +1000679 if (mkdir(buf, 0700) < 0)
Damien Miller95def091999-11-25 00:26:21 +1100680 error("Could not create directory '%.200s'.", buf);
681
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000682 /* load options.identity_files */
683 load_public_identity_files();
684
685 /* Expand ~ in known host file names. */
686 /* XXX mem-leaks: */
Damien Miller0bc1bd82000-11-13 22:57:25 +1100687 options.system_hostfile =
688 tilde_expand_filename(options.system_hostfile, original_real_uid);
689 options.user_hostfile =
690 tilde_expand_filename(options.user_hostfile, original_real_uid);
691 options.system_hostfile2 =
692 tilde_expand_filename(options.system_hostfile2, original_real_uid);
693 options.user_hostfile2 =
694 tilde_expand_filename(options.user_hostfile2, original_real_uid);
Damien Miller95def091999-11-25 00:26:21 +1100695
Damien Miller07cd5892001-11-12 10:52:03 +1100696 signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
697
Damien Miller95def091999-11-25 00:26:21 +1100698 /* Log into the remote system. This never returns if the login fails. */
Ben Lindstrom1bad2562002-06-06 19:57:33 +0000699 ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr, pw);
Damien Miller95def091999-11-25 00:26:21 +1100700
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000701 /* We no longer need the private host keys. Clear them now. */
702 if (sensitive_data.nkeys != 0) {
703 for (i = 0; i < sensitive_data.nkeys; i++) {
704 if (sensitive_data.keys[i] != NULL) {
705 /* Destroys contents safely */
706 debug3("clear hostkey %d", i);
707 key_free(sensitive_data.keys[i]);
708 sensitive_data.keys[i] = NULL;
709 }
710 }
711 xfree(sensitive_data.keys);
712 }
Ben Lindstroma6c8a8d2001-08-06 21:42:00 +0000713 for (i = 0; i < options.num_identity_files; i++) {
714 if (options.identity_files[i]) {
715 xfree(options.identity_files[i]);
716 options.identity_files[i] = NULL;
717 }
718 if (options.identity_keys[i]) {
719 key_free(options.identity_keys[i]);
720 options.identity_keys[i] = NULL;
721 }
722 }
Damien Miller95def091999-11-25 00:26:21 +1100723
Damien Miller1383bd82000-04-06 12:32:37 +1000724 exit_status = compat20 ? ssh_session2() : ssh_session();
725 packet_close();
726 return exit_status;
727}
728
Ben Lindstrombba81212001-06-25 05:01:22 +0000729static void
Ben Lindstrom4a4bd712001-12-06 17:45:19 +0000730x11_get_proto(char **_proto, char **_data)
Damien Millerbd483e72000-04-30 10:00:53 +1000731{
732 char line[512];
Ben Lindstrom4a4bd712001-12-06 17:45:19 +0000733 static char proto[512], data[512];
Damien Millerbd483e72000-04-30 10:00:53 +1000734 FILE *f;
735 int got_data = 0, i;
Damien Miller35b13d62002-02-05 12:12:09 +1100736 char *display;
Ben Lindstromee8d52d2002-07-23 21:03:02 +0000737 struct stat st;
Damien Millerbd483e72000-04-30 10:00:53 +1000738
Ben Lindstrom4a4bd712001-12-06 17:45:19 +0000739 *_proto = proto;
740 *_data = data;
741 proto[0] = data[0] = '\0';
Ben Lindstromee8d52d2002-07-23 21:03:02 +0000742 if (!options.xauth_location ||
743 (stat(options.xauth_location, &st) == -1)) {
744 debug("No xauth program.");
745 } else {
746 if ((display = getenv("DISPLAY")) == NULL) {
747 debug("x11_get_proto: DISPLAY not set");
748 return;
749 }
Damien Millerd3a18572000-06-07 19:55:44 +1000750 /* Try to get Xauthority information for the display. */
Damien Miller35b13d62002-02-05 12:12:09 +1100751 if (strncmp(display, "localhost:", 10) == 0)
752 /*
753 * Handle FamilyLocal case where $DISPLAY does
754 * not match an authorization entry. For this we
755 * just try "xauth list unix:displaynum.screennum".
756 * XXX: "localhost" match to determine FamilyLocal
757 * is not perfect.
758 */
Ben Lindstromfac77692002-06-06 19:49:54 +0000759 snprintf(line, sizeof line, "%s list unix:%s 2>"
Damien Miller35b13d62002-02-05 12:12:09 +1100760 _PATH_DEVNULL, options.xauth_location, display+10);
761 else
Ben Lindstromfac77692002-06-06 19:49:54 +0000762 snprintf(line, sizeof line, "%s list %.200s 2>"
Damien Miller35b13d62002-02-05 12:12:09 +1100763 _PATH_DEVNULL, options.xauth_location, display);
Ben Lindstromee8d52d2002-07-23 21:03:02 +0000764 debug2("x11_get_proto: %s", line);
Damien Millerd3a18572000-06-07 19:55:44 +1000765 f = popen(line, "r");
766 if (f && fgets(line, sizeof(line), f) &&
Ben Lindstrom4a4bd712001-12-06 17:45:19 +0000767 sscanf(line, "%*s %511s %511s", proto, data) == 2)
Damien Millerd3a18572000-06-07 19:55:44 +1000768 got_data = 1;
769 if (f)
770 pclose(f);
771 }
Damien Millerbd483e72000-04-30 10:00:53 +1000772 /*
773 * If we didn't get authentication data, just make up some
774 * data. The forwarding code will check the validity of the
775 * response anyway, and substitute this data. The X11
776 * server, however, will ignore this fake data and use
777 * whatever authentication mechanisms it was using otherwise
778 * for the local connection.
779 */
780 if (!got_data) {
781 u_int32_t rand = 0;
782
Ben Lindstromee8d52d2002-07-23 21:03:02 +0000783 log("Warning: No xauth data; using fake authentication data for X11 forwarding.");
Ben Lindstrom4a4bd712001-12-06 17:45:19 +0000784 strlcpy(proto, "MIT-MAGIC-COOKIE-1", sizeof proto);
Damien Millerbd483e72000-04-30 10:00:53 +1000785 for (i = 0; i < 16; i++) {
786 if (i % 4 == 0)
787 rand = arc4random();
Ben Lindstrom4a4bd712001-12-06 17:45:19 +0000788 snprintf(data + 2 * i, sizeof data - 2 * i, "%02x", rand & 0xff);
Damien Millerbd483e72000-04-30 10:00:53 +1000789 rand >>= 8;
790 }
791 }
792}
793
Ben Lindstrombba81212001-06-25 05:01:22 +0000794static void
Damien Miller0bc1bd82000-11-13 22:57:25 +1100795ssh_init_forwarding(void)
796{
Kevin Steves12057502001-02-05 14:54:34 +0000797 int success = 0;
Damien Miller0bc1bd82000-11-13 22:57:25 +1100798 int i;
Kevin Steves12057502001-02-05 14:54:34 +0000799
Damien Miller0bc1bd82000-11-13 22:57:25 +1100800 /* Initiate local TCP/IP port forwardings. */
801 for (i = 0; i < options.num_local_forwards; i++) {
802 debug("Connections to local port %d forwarded to remote address %.200s:%d",
803 options.local_forwards[i].port,
804 options.local_forwards[i].host,
805 options.local_forwards[i].host_port);
Damien Millerb16461c2002-01-22 23:29:22 +1100806 success += channel_setup_local_fwd_listener(
Damien Miller0bc1bd82000-11-13 22:57:25 +1100807 options.local_forwards[i].port,
808 options.local_forwards[i].host,
809 options.local_forwards[i].host_port,
810 options.gateway_ports);
811 }
Kevin Steves12057502001-02-05 14:54:34 +0000812 if (i > 0 && success == 0)
813 error("Could not request local forwarding.");
Damien Miller0bc1bd82000-11-13 22:57:25 +1100814
815 /* Initiate remote TCP/IP port forwardings. */
816 for (i = 0; i < options.num_remote_forwards; i++) {
817 debug("Connections to remote port %d forwarded to local address %.200s:%d",
818 options.remote_forwards[i].port,
819 options.remote_forwards[i].host,
820 options.remote_forwards[i].host_port);
821 channel_request_remote_forwarding(
822 options.remote_forwards[i].port,
823 options.remote_forwards[i].host,
824 options.remote_forwards[i].host_port);
825 }
826}
827
Ben Lindstrombba81212001-06-25 05:01:22 +0000828static void
Damien Miller0bc1bd82000-11-13 22:57:25 +1100829check_agent_present(void)
830{
831 if (options.forward_agent) {
832 /* Clear agent forwarding if we don\'t have an agent. */
833 int authfd = ssh_get_authentication_socket();
834 if (authfd < 0)
835 options.forward_agent = 0;
836 else
837 ssh_close_authentication_socket(authfd);
838 }
839}
840
Ben Lindstrombba81212001-06-25 05:01:22 +0000841static int
Damien Miller1383bd82000-04-06 12:32:37 +1000842ssh_session(void)
843{
844 int type;
Damien Miller1383bd82000-04-06 12:32:37 +1000845 int interactive = 0;
846 int have_tty = 0;
847 struct winsize ws;
Damien Miller1383bd82000-04-06 12:32:37 +1000848 char *cp;
849
Damien Miller95def091999-11-25 00:26:21 +1100850 /* Enable compression if requested. */
851 if (options.compression) {
852 debug("Requesting compression at level %d.", options.compression_level);
853
854 if (options.compression_level < 1 || options.compression_level > 9)
855 fatal("Compression level must be from 1 (fast) to 9 (slow, best).");
856
857 /* Send the request. */
858 packet_start(SSH_CMSG_REQUEST_COMPRESSION);
859 packet_put_int(options.compression_level);
860 packet_send();
861 packet_write_wait();
Damien Millerdff50992002-01-22 23:16:32 +1100862 type = packet_read();
Damien Miller95def091999-11-25 00:26:21 +1100863 if (type == SSH_SMSG_SUCCESS)
864 packet_start_compression(options.compression_level);
865 else if (type == SSH_SMSG_FAILURE)
866 log("Warning: Remote host refused compression.");
867 else
868 packet_disconnect("Protocol error waiting for compression response.");
869 }
870 /* Allocate a pseudo tty if appropriate. */
871 if (tty_flag) {
872 debug("Requesting pty.");
873
874 /* Start the packet. */
875 packet_start(SSH_CMSG_REQUEST_PTY);
876
877 /* Store TERM in the packet. There is no limit on the
878 length of the string. */
879 cp = getenv("TERM");
880 if (!cp)
881 cp = "";
Ben Lindstrom664408d2001-06-09 01:42:01 +0000882 packet_put_cstring(cp);
Damien Miller95def091999-11-25 00:26:21 +1100883
884 /* Store window size in the packet. */
885 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
886 memset(&ws, 0, sizeof(ws));
887 packet_put_int(ws.ws_row);
888 packet_put_int(ws.ws_col);
889 packet_put_int(ws.ws_xpixel);
890 packet_put_int(ws.ws_ypixel);
891
892 /* Store tty modes in the packet. */
Ben Lindstromae8e2d32001-04-14 23:13:02 +0000893 tty_make_modes(fileno(stdin), NULL);
Damien Miller95def091999-11-25 00:26:21 +1100894
895 /* Send the packet, and wait for it to leave. */
896 packet_send();
897 packet_write_wait();
898
899 /* Read response from the server. */
Damien Millerdff50992002-01-22 23:16:32 +1100900 type = packet_read();
Damien Miller450a7a12000-03-26 13:04:51 +1000901 if (type == SSH_SMSG_SUCCESS) {
Damien Miller95def091999-11-25 00:26:21 +1100902 interactive = 1;
Damien Miller1383bd82000-04-06 12:32:37 +1000903 have_tty = 1;
Damien Miller450a7a12000-03-26 13:04:51 +1000904 } else if (type == SSH_SMSG_FAILURE)
Damien Miller95def091999-11-25 00:26:21 +1100905 log("Warning: Remote host failed or refused to allocate a pseudo tty.");
906 else
907 packet_disconnect("Protocol error waiting for pty request response.");
908 }
909 /* Request X11 forwarding if enabled and DISPLAY is set. */
910 if (options.forward_x11 && getenv("DISPLAY") != NULL) {
Ben Lindstrom4a4bd712001-12-06 17:45:19 +0000911 char *proto, *data;
Damien Millerbd483e72000-04-30 10:00:53 +1000912 /* Get reasonable local authentication information. */
Ben Lindstrom4a4bd712001-12-06 17:45:19 +0000913 x11_get_proto(&proto, &data);
Damien Millerbd483e72000-04-30 10:00:53 +1000914 /* Request forwarding with authentication spoofing. */
Damien Miller95def091999-11-25 00:26:21 +1100915 debug("Requesting X11 forwarding with authentication spoofing.");
Damien Millerbd483e72000-04-30 10:00:53 +1000916 x11_request_forwarding_with_spoofing(0, proto, data);
Damien Miller95def091999-11-25 00:26:21 +1100917
918 /* Read response from the server. */
Damien Millerdff50992002-01-22 23:16:32 +1100919 type = packet_read();
Damien Miller95def091999-11-25 00:26:21 +1100920 if (type == SSH_SMSG_SUCCESS) {
Damien Miller95def091999-11-25 00:26:21 +1100921 interactive = 1;
Damien Millerbd483e72000-04-30 10:00:53 +1000922 } else if (type == SSH_SMSG_FAILURE) {
Damien Miller95def091999-11-25 00:26:21 +1100923 log("Warning: Remote host denied X11 forwarding.");
Damien Millerbd483e72000-04-30 10:00:53 +1000924 } else {
Damien Miller95def091999-11-25 00:26:21 +1100925 packet_disconnect("Protocol error waiting for X11 forwarding");
Damien Millerbd483e72000-04-30 10:00:53 +1000926 }
Damien Miller95def091999-11-25 00:26:21 +1100927 }
928 /* Tell the packet module whether this is an interactive session. */
Ben Lindstrombf555ba2001-01-18 02:04:35 +0000929 packet_set_interactive(interactive);
Damien Miller95def091999-11-25 00:26:21 +1100930
931 /* Request authentication agent forwarding if appropriate. */
Damien Miller0bc1bd82000-11-13 22:57:25 +1100932 check_agent_present();
933
Damien Miller95def091999-11-25 00:26:21 +1100934 if (options.forward_agent) {
935 debug("Requesting authentication agent forwarding.");
936 auth_request_forwarding();
937
938 /* Read response from the server. */
Damien Millerdff50992002-01-22 23:16:32 +1100939 type = packet_read();
Damien Miller48b03fc2002-01-22 23:11:40 +1100940 packet_check_eom();
Damien Miller95def091999-11-25 00:26:21 +1100941 if (type != SSH_SMSG_SUCCESS)
942 log("Warning: Remote host denied authentication agent forwarding.");
943 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000944
Damien Miller0bc1bd82000-11-13 22:57:25 +1100945 /* Initiate port forwardings. */
946 ssh_init_forwarding();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000947
Damien Miller5428f641999-11-25 11:54:57 +1100948 /* If requested, let ssh continue in the background. */
Damien Miller4af51302000-04-16 11:18:38 +1000949 if (fork_after_authentication_flag)
Damien Miller5428f641999-11-25 11:54:57 +1100950 if (daemon(1, 1) < 0)
951 fatal("daemon() failed: %.200s", strerror(errno));
952
953 /*
954 * If a command was specified on the command line, execute the
955 * command now. Otherwise request the server to start a shell.
956 */
Damien Miller95def091999-11-25 00:26:21 +1100957 if (buffer_len(&command) > 0) {
958 int len = buffer_len(&command);
959 if (len > 900)
960 len = 900;
Damien Miller5a6b4fe2001-12-21 14:56:54 +1100961 debug("Sending command: %.*s", len, (u_char *)buffer_ptr(&command));
Damien Miller95def091999-11-25 00:26:21 +1100962 packet_start(SSH_CMSG_EXEC_CMD);
963 packet_put_string(buffer_ptr(&command), buffer_len(&command));
964 packet_send();
965 packet_write_wait();
966 } else {
967 debug("Requesting shell.");
968 packet_start(SSH_CMSG_EXEC_SHELL);
969 packet_send();
970 packet_write_wait();
971 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000972
Damien Miller95def091999-11-25 00:26:21 +1100973 /* Enter the interactive session. */
Ben Lindstrom2b1f71b2001-06-05 20:32:21 +0000974 return client_loop(have_tty, tty_flag ?
975 options.escape_char : SSH_ESCAPECHAR_NONE, 0);
Damien Miller1383bd82000-04-06 12:32:37 +1000976}
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000977
Ben Lindstrombba81212001-06-25 05:01:22 +0000978static void
Damien Miller630d6f42002-01-22 23:17:30 +1100979client_subsystem_reply(int type, u_int32_t seq, void *ctxt)
Ben Lindstrom1e7d3062001-02-09 02:36:43 +0000980{
981 int id, len;
982
983 id = packet_get_int();
984 len = buffer_len(&command);
Ben Lindstrom4040fe12001-03-05 06:52:57 +0000985 if (len > 900)
986 len = 900;
Damien Miller48b03fc2002-01-22 23:11:40 +1100987 packet_check_eom();
Ben Lindstrom1e7d3062001-02-09 02:36:43 +0000988 if (type == SSH2_MSG_CHANNEL_FAILURE)
989 fatal("Request for subsystem '%.*s' failed on channel %d",
Damien Miller5a6b4fe2001-12-21 14:56:54 +1100990 len, (u_char *)buffer_ptr(&command), id);
Ben Lindstrom1e7d3062001-02-09 02:36:43 +0000991}
992
Damien Miller2797f7f2002-04-23 21:09:44 +1000993void
994client_global_request_reply(int type, u_int32_t seq, void *ctxt)
995{
996 int i;
997
998 i = client_global_request_id++;
999 if (i >= options.num_remote_forwards) {
1000 debug("client_global_request_reply: too many replies %d > %d",
1001 i, options.num_remote_forwards);
1002 return;
1003 }
1004 debug("remote forward %s for: listen %d, connect %s:%d",
1005 type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
1006 options.remote_forwards[i].port,
1007 options.remote_forwards[i].host,
1008 options.remote_forwards[i].host_port);
1009 if (type == SSH2_MSG_REQUEST_FAILURE)
1010 log("Warning: remote port forwarding failed for listen port %d",
1011 options.remote_forwards[i].port);
1012}
1013
Ben Lindstromf558cf62001-09-20 23:13:49 +00001014/* request pty/x11/agent/tcpfwd/shell for channel */
Ben Lindstrombba81212001-06-25 05:01:22 +00001015static void
Ben Lindstromf558cf62001-09-20 23:13:49 +00001016ssh_session2_setup(int id, void *arg)
Damien Miller1383bd82000-04-06 12:32:37 +10001017{
1018 int len;
Ben Lindstrombf555ba2001-01-18 02:04:35 +00001019 int interactive = 0;
Ben Lindstromae8e2d32001-04-14 23:13:02 +00001020 struct termios tio;
Ben Lindstrombf555ba2001-01-18 02:04:35 +00001021
Ben Lindstromf558cf62001-09-20 23:13:49 +00001022 debug("ssh_session2_setup: id %d", id);
Damien Miller1383bd82000-04-06 12:32:37 +10001023
Damien Miller1383bd82000-04-06 12:32:37 +10001024 if (tty_flag) {
1025 struct winsize ws;
1026 char *cp;
1027 cp = getenv("TERM");
1028 if (!cp)
1029 cp = "";
1030 /* Store window size in the packet. */
1031 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
1032 memset(&ws, 0, sizeof(ws));
1033
1034 channel_request_start(id, "pty-req", 0);
1035 packet_put_cstring(cp);
1036 packet_put_int(ws.ws_col);
1037 packet_put_int(ws.ws_row);
1038 packet_put_int(ws.ws_xpixel);
1039 packet_put_int(ws.ws_ypixel);
Ben Lindstromae8e2d32001-04-14 23:13:02 +00001040 tio = get_saved_tio();
1041 tty_make_modes(/*ignored*/ 0, &tio);
Damien Miller1383bd82000-04-06 12:32:37 +10001042 packet_send();
Ben Lindstrombf555ba2001-01-18 02:04:35 +00001043 interactive = 1;
Damien Miller1383bd82000-04-06 12:32:37 +10001044 /* XXX wait for reply */
1045 }
Damien Millerbd483e72000-04-30 10:00:53 +10001046 if (options.forward_x11 &&
1047 getenv("DISPLAY") != NULL) {
Ben Lindstrom4a4bd712001-12-06 17:45:19 +00001048 char *proto, *data;
Damien Millerbd483e72000-04-30 10:00:53 +10001049 /* Get reasonable local authentication information. */
Ben Lindstrom4a4bd712001-12-06 17:45:19 +00001050 x11_get_proto(&proto, &data);
Damien Millerbd483e72000-04-30 10:00:53 +10001051 /* Request forwarding with authentication spoofing. */
1052 debug("Requesting X11 forwarding with authentication spoofing.");
1053 x11_request_forwarding_with_spoofing(id, proto, data);
Ben Lindstrombf555ba2001-01-18 02:04:35 +00001054 interactive = 1;
Damien Millerbd483e72000-04-30 10:00:53 +10001055 /* XXX wait for reply */
1056 }
1057
Damien Miller0bc1bd82000-11-13 22:57:25 +11001058 check_agent_present();
1059 if (options.forward_agent) {
1060 debug("Requesting authentication agent forwarding.");
1061 channel_request_start(id, "auth-agent-req@openssh.com", 0);
1062 packet_send();
1063 }
1064
Damien Miller1383bd82000-04-06 12:32:37 +10001065 len = buffer_len(&command);
1066 if (len > 0) {
1067 if (len > 900)
1068 len = 900;
Damien Miller832562e2001-01-30 09:30:01 +11001069 if (subsystem_flag) {
Damien Miller5a6b4fe2001-12-21 14:56:54 +11001070 debug("Sending subsystem: %.*s", len, (u_char *)buffer_ptr(&command));
Ben Lindstrom1e7d3062001-02-09 02:36:43 +00001071 channel_request_start(id, "subsystem", /*want reply*/ 1);
1072 /* register callback for reply */
Ben Lindstromf666fec2002-06-06 19:51:58 +00001073 /* XXX we assume that client_loop has already been called */
Ben Lindstrom1e7d3062001-02-09 02:36:43 +00001074 dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &client_subsystem_reply);
1075 dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &client_subsystem_reply);
Damien Miller832562e2001-01-30 09:30:01 +11001076 } else {
Damien Miller5a6b4fe2001-12-21 14:56:54 +11001077 debug("Sending command: %.*s", len, (u_char *)buffer_ptr(&command));
Damien Miller832562e2001-01-30 09:30:01 +11001078 channel_request_start(id, "exec", 0);
1079 }
Ben Lindstrom4040fe12001-03-05 06:52:57 +00001080 packet_put_string(buffer_ptr(&command), buffer_len(&command));
Damien Miller1383bd82000-04-06 12:32:37 +10001081 packet_send();
1082 } else {
Damien Millera500cd62002-02-08 22:04:26 +11001083 channel_request_start(id, "shell", 0);
1084 packet_send();
Damien Miller1383bd82000-04-06 12:32:37 +10001085 }
Ben Lindstrom1e7d3062001-02-09 02:36:43 +00001086
Ben Lindstrombf555ba2001-01-18 02:04:35 +00001087 packet_set_interactive(interactive);
Damien Miller1383bd82000-04-06 12:32:37 +10001088}
1089
Ben Lindstromf558cf62001-09-20 23:13:49 +00001090/* open new channel for a session */
Ben Lindstrombba81212001-06-25 05:01:22 +00001091static int
Ben Lindstromf558cf62001-09-20 23:13:49 +00001092ssh_session2_open(void)
Damien Miller1383bd82000-04-06 12:32:37 +10001093{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001094 Channel *c;
1095 int window, packetmax, in, out, err;
Damien Millerad833b32000-08-23 10:46:23 +10001096
Damien Millercaf6dd62000-08-29 11:33:50 +11001097 if (stdin_null_flag) {
Ben Lindstrom31ca54a2001-02-09 02:11:24 +00001098 in = open(_PATH_DEVNULL, O_RDONLY);
Damien Millercaf6dd62000-08-29 11:33:50 +11001099 } else {
1100 in = dup(STDIN_FILENO);
1101 }
1102 out = dup(STDOUT_FILENO);
1103 err = dup(STDERR_FILENO);
1104
1105 if (in < 0 || out < 0 || err < 0)
1106 fatal("dup() in/out/err failed");
1107
Damien Miller69b69aa2000-10-28 14:19:58 +11001108 /* enable nonblocking unless tty */
1109 if (!isatty(in))
1110 set_nonblock(in);
1111 if (!isatty(out))
1112 set_nonblock(out);
1113 if (!isatty(err))
1114 set_nonblock(err);
1115
Damien Millere4340be2000-09-16 13:29:08 +11001116 window = CHAN_SES_WINDOW_DEFAULT;
1117 packetmax = CHAN_SES_PACKET_DEFAULT;
Damien Miller19a59452002-02-19 15:20:57 +11001118 if (tty_flag) {
1119 window >>= 1;
1120 packetmax >>= 1;
Damien Miller1383bd82000-04-06 12:32:37 +10001121 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001122 c = channel_new(
Damien Miller1383bd82000-04-06 12:32:37 +10001123 "session", SSH_CHANNEL_OPENING, in, out, err,
Damien Millere4340be2000-09-16 13:29:08 +11001124 window, packetmax, CHAN_EXTENDED_WRITE,
Damien Miller69b69aa2000-10-28 14:19:58 +11001125 xstrdup("client-session"), /*nonblock*/0);
Damien Miller1383bd82000-04-06 12:32:37 +10001126
Ben Lindstromf558cf62001-09-20 23:13:49 +00001127 debug3("ssh_session2_open: channel_new: %d", c->self);
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001128
Ben Lindstrom5ec26452001-06-09 00:18:51 +00001129 channel_send_open(c->self);
Ben Lindstromf558cf62001-09-20 23:13:49 +00001130 if (!no_shell_flag)
Damien Miller67f0bc02002-02-05 12:23:08 +11001131 channel_register_confirm(c->self, ssh_session2_setup);
Damien Miller1383bd82000-04-06 12:32:37 +10001132
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001133 return c->self;
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001134}
1135
Ben Lindstrombba81212001-06-25 05:01:22 +00001136static int
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001137ssh_session2(void)
1138{
Ben Lindstromf558cf62001-09-20 23:13:49 +00001139 int id = -1;
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001140
1141 /* XXX should be pre-session */
1142 ssh_init_forwarding();
1143
Ben Lindstromf558cf62001-09-20 23:13:49 +00001144 if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN))
1145 id = ssh_session2_open();
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001146
1147 /* If requested, let ssh continue in the background. */
1148 if (fork_after_authentication_flag)
1149 if (daemon(1, 1) < 0)
1150 fatal("daemon() failed: %.200s", strerror(errno));
1151
Ben Lindstrom2b1f71b2001-06-05 20:32:21 +00001152 return client_loop(tty_flag, tty_flag ?
1153 options.escape_char : SSH_ESCAPECHAR_NONE, id);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001154}
Damien Miller0bc1bd82000-11-13 22:57:25 +11001155
Ben Lindstrombba81212001-06-25 05:01:22 +00001156static void
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001157load_public_identity_files(void)
1158{
1159 char *filename;
Ben Lindstrom711b04a2001-08-06 21:12:42 +00001160 int i = 0;
Ben Lindstrom0936a5b2002-03-26 03:17:42 +00001161 Key *public;
Ben Lindstrom711b04a2001-08-06 21:12:42 +00001162#ifdef SMARTCARD
Ben Lindstrom0936a5b2002-03-26 03:17:42 +00001163 Key **keys;
1164
Ben Lindstromf7db3bb2001-08-06 21:35:51 +00001165 if (options.smartcard_device != NULL &&
Ben Lindstrom0936a5b2002-03-26 03:17:42 +00001166 options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
1167 (keys = sc_get_keys(options.smartcard_device, NULL)) != NULL ) {
1168 int count = 0;
1169 for (i = 0; keys[i] != NULL; i++) {
1170 count++;
Ben Lindstrom0936a5b2002-03-26 03:17:42 +00001171 memmove(&options.identity_files[1], &options.identity_files[0],
1172 sizeof(char *) * (SSH_MAX_IDENTITY_FILES - 1));
1173 memmove(&options.identity_keys[1], &options.identity_keys[0],
1174 sizeof(Key *) * (SSH_MAX_IDENTITY_FILES - 1));
1175 options.num_identity_files++;
1176 options.identity_keys[0] = keys[i];
1177 options.identity_files[0] = xstrdup("smartcard key");;
1178 }
Ben Lindstrom4f054602002-03-26 03:23:00 +00001179 if (options.num_identity_files > SSH_MAX_IDENTITY_FILES)
1180 options.num_identity_files = SSH_MAX_IDENTITY_FILES;
Ben Lindstrom0936a5b2002-03-26 03:17:42 +00001181 i = count;
1182 xfree(keys);
Ben Lindstrom711b04a2001-08-06 21:12:42 +00001183 }
Ben Lindstromffce1472001-08-06 21:57:31 +00001184#endif /* SMARTCARD */
Ben Lindstrom711b04a2001-08-06 21:12:42 +00001185 for (; i < options.num_identity_files; i++) {
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001186 filename = tilde_expand_filename(options.identity_files[i],
1187 original_real_uid);
Ben Lindstromd0fca422001-03-26 13:44:06 +00001188 public = key_load_public(filename, NULL);
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001189 debug("identity file %s type %d", filename,
1190 public ? public->type : -1);
1191 xfree(options.identity_files[i]);
1192 options.identity_files[i] = filename;
1193 options.identity_keys[i] = public;
1194 }
1195}