blob: 9e3f73555d0ccee4eb0181ef82027bfc90a6dd66 [file] [log] [blame]
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.
Darren Tucker0a118da2003-10-15 15:54:32 +100016 * Copyright (c) 2000, 2001, 2002, 2003 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"
Darren Tucker3f9fdc72004-06-22 12:56:01 +100043RCSID("$OpenBSD: ssh.c,v 1.221 2004/06/21 17:36:31 avsm 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"
Damien Miller0e220db2004-06-15 10:34:08 +100056#include "bufaux.h"
Ben Lindstromc7637672001-06-09 00:36:26 +000057#include "channels.h"
Damien Millereba71ba2000-04-29 23:57:08 +100058#include "key.h"
Damien Miller994cf142000-07-21 10:19:44 +100059#include "authfd.h"
Damien Millereba71ba2000-04-29 23:57:08 +100060#include "authfile.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000061#include "pathnames.h"
Damien Miller0e220db2004-06-15 10:34:08 +100062#include "dispatch.h"
Ben Lindstrombf555ba2001-01-18 02:04:35 +000063#include "clientloop.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000064#include "log.h"
65#include "readconf.h"
66#include "sshconnect.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"
Darren Tucker06f2bd82004-05-13 16:06:46 +100070#include "sshpty.h"
Darren Tucker46bc0752004-05-02 22:11:30 +100071#include "match.h"
Damien Miller0e220db2004-06-15 10:34:08 +100072#include "msg.h"
73#include "monitor_fdpass.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100074
Ben Lindstromc5b68002001-07-04 04:52:03 +000075#ifdef SMARTCARD
Ben Lindstromc5b68002001-07-04 04:52:03 +000076#include "scard.h"
Ben Lindstrombcc18082001-08-06 21:59:25 +000077#endif
Ben Lindstromc5b68002001-07-04 04:52:03 +000078
Damien Miller3f905871999-11-15 17:10:57 +110079#ifdef HAVE___PROGNAME
80extern char *__progname;
Ben Lindstrom49a79c02000-11-17 03:47:20 +000081#else
82char *__progname;
83#endif
Damien Miller3f905871999-11-15 17:10:57 +110084
Damien Miller95def091999-11-25 00:26:21 +110085/* Flag indicating whether debug mode is on. This can be set on the command line. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100086int debug_flag = 0;
87
Damien Miller78928792000-04-12 20:17:38 +100088/* Flag indicating whether a tty should be allocated */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100089int tty_flag = 0;
Ben Lindstrom4dccfa52000-12-28 16:40:05 +000090int no_tty_flag = 0;
91int force_tty_flag = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100092
Damien Miller1383bd82000-04-06 12:32:37 +100093/* don't exec a shell */
94int no_shell_flag = 0;
Damien Miller1383bd82000-04-06 12:32:37 +100095
Damien Miller5428f641999-11-25 11:54:57 +110096/*
97 * Flag indicating that nothing should be read from stdin. This can be set
98 * on the command line.
99 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000100int stdin_null_flag = 0;
101
Damien Miller5428f641999-11-25 11:54:57 +1100102/*
103 * Flag indicating that ssh should fork after authentication. This is useful
Ben Lindstromf666fec2002-06-06 19:51:58 +0000104 * so that the passphrase can be entered manually, and then ssh goes to the
Damien Miller5428f641999-11-25 11:54:57 +1100105 * background.
106 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000107int fork_after_authentication_flag = 0;
108
Damien Miller5428f641999-11-25 11:54:57 +1100109/*
110 * General data structure for command line options and options configurable
111 * in configuration files. See readconf.h.
112 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000113Options options;
114
Ben Lindstrom14f31ab2001-09-12 17:48:04 +0000115/* optional user configfile */
116char *config = NULL;
117
Damien Miller5428f641999-11-25 11:54:57 +1100118/*
119 * Name of the host we are connecting to. This is the name given on the
120 * command line, or the HostName specified for the user-supplied name in a
121 * configuration file.
122 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000123char *host;
124
125/* socket address the host resolves to */
Damien Miller34132e52000-01-14 15:45:46 +1100126struct sockaddr_storage hostaddr;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000127
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000128/* Private host keys. */
Ben Lindstrom1bad2562002-06-06 19:57:33 +0000129Sensitive sensitive_data;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000130
131/* Original real UID. */
132uid_t original_real_uid;
Ben Lindstromf9c48842002-06-11 16:37:51 +0000133uid_t original_effective_uid;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000134
Damien Miller1383bd82000-04-06 12:32:37 +1000135/* command to be executed */
136Buffer command;
137
Damien Miller832562e2001-01-30 09:30:01 +1100138/* Should we execute a command or invoke a subsystem? */
139int subsystem_flag = 0;
140
Damien Miller2797f7f2002-04-23 21:09:44 +1000141/* # of replies received for global requests */
142static int client_global_request_id = 0;
143
Damien Miller8c4e18a2002-09-19 12:05:02 +1000144/* pid of proxycommand child process */
145pid_t proxy_command_pid = 0;
146
Damien Miller0e220db2004-06-15 10:34:08 +1000147/* fd to control socket */
148int control_fd = -1;
149
150/* Only used in control client mode */
151volatile sig_atomic_t control_client_terminate = 0;
152u_int control_server_pid = 0;
153
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000154/* Prints a help message to the user. This function never returns. */
155
Ben Lindstrombba81212001-06-25 05:01:22 +0000156static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000157usage(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000158{
Damien Miller50955102004-03-22 09:34:58 +1100159 fprintf(stderr,
Darren Tuckerba5c5922004-06-18 16:22:39 +1000160"usage: ssh [-1246AaCfghkMNnqsTtVvXxY] [-b bind_address] [-c cipher_spec]\n"
Damien Miller50955102004-03-22 09:34:58 +1100161" [-D port] [-e escape_char] [-F configfile] [-i identity_file]\n"
162" [-L port:host:hostport] [-l login_name] [-m mac_spec] [-o option]\n"
Damien Millerb8ea2482004-06-18 22:21:55 +1000163" [-p port] [-R port:host:hostport] [-S ctl] [user@]hostname [command]\n"
Damien Miller50955102004-03-22 09:34:58 +1100164 );
Damien Miller95def091999-11-25 00:26:21 +1100165 exit(1);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000166}
167
Ben Lindstrombba81212001-06-25 05:01:22 +0000168static int ssh_session(void);
169static int ssh_session2(void);
170static void load_public_identity_files(void);
Damien Miller0e220db2004-06-15 10:34:08 +1000171static void control_client(const char *path);
Damien Miller1383bd82000-04-06 12:32:37 +1000172
Damien Miller95def091999-11-25 00:26:21 +1100173/*
174 * Main program for the ssh client.
175 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000176int
177main(int ac, char **av)
178{
Ben Lindstrom24157572002-06-12 16:09:39 +0000179 int i, opt, exit_status;
Damien Milleraae6c611999-12-06 11:47:28 +1100180 u_short fwd_port, fwd_host_port;
Ben Lindstrom1a174712001-09-12 17:56:15 +0000181 char sfwd_port[6], sfwd_host_port[6];
Damien Miller9836cf82003-12-17 16:30:06 +1100182 char *p, *cp, *line, buf[256];
Damien Miller95def091999-11-25 00:26:21 +1100183 struct stat st;
Ben Lindstrom086cf212001-03-05 05:56:40 +0000184 struct passwd *pw;
Damien Miller1383bd82000-04-06 12:32:37 +1000185 int dummy;
Ben Lindstrom5ccf63a2001-09-24 20:00:10 +0000186 extern int optind, optreset;
Damien Miller4f8e6692001-07-14 13:22:53 +1000187 extern char *optarg;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000188
Damien Miller59d3d5b2003-08-22 09:34:41 +1000189 __progname = ssh_get_progname(av[0]);
Damien Millerf9b625c2000-07-09 22:42:32 +1000190 init_rng();
191
Damien Miller5428f641999-11-25 11:54:57 +1100192 /*
193 * Save the original real uid. It will be needed later (uid-swapping
194 * may clobber the real uid).
195 */
Damien Miller95def091999-11-25 00:26:21 +1100196 original_real_uid = getuid();
197 original_effective_uid = geteuid();
Damien Millera8e06ce2003-11-21 23:48:55 +1100198
Damien Miller50b9a602002-09-04 16:50:06 +1000199 /*
200 * Use uid-swapping to give up root privileges for the duration of
201 * option processing. We will re-instantiate the rights when we are
202 * ready to create the privileged port, and will permanently drop
203 * them when the port has been created (actually, when the connection
204 * has been made, as we may need to create the port several times).
205 */
206 PRIV_END;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000207
Damien Miller05dd7952000-10-01 00:42:48 +1100208#ifdef HAVE_SETRLIMIT
Damien Miller95def091999-11-25 00:26:21 +1100209 /* If we are installed setuid root be careful to not drop core. */
210 if (original_real_uid != original_effective_uid) {
211 struct rlimit rlim;
212 rlim.rlim_cur = rlim.rlim_max = 0;
213 if (setrlimit(RLIMIT_CORE, &rlim) < 0)
214 fatal("setrlimit failed: %.100s", strerror(errno));
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000215 }
Damien Millerbac2d8a2000-09-05 16:13:06 +1100216#endif
Ben Lindstrom3fcf1a22001-04-08 18:26:59 +0000217 /* Get user data. */
218 pw = getpwuid(original_real_uid);
219 if (!pw) {
Damien Miller996acd22003-04-09 20:59:48 +1000220 logit("You don't exist, go away!");
Ben Lindstrom3fcf1a22001-04-08 18:26:59 +0000221 exit(1);
222 }
223 /* Take a copy of the returned structure. */
224 pw = pwcopy(pw);
225
Damien Miller5428f641999-11-25 11:54:57 +1100226 /*
Damien Miller5428f641999-11-25 11:54:57 +1100227 * Set our umask to something reasonable, as some files are created
228 * with the default umask. This will make them world-readable but
229 * writable only by the owner, which is ok for all files for which we
230 * don't set the modes explicitly.
231 */
Damien Miller95def091999-11-25 00:26:21 +1100232 umask(022);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000233
Damien Miller95def091999-11-25 00:26:21 +1100234 /* Initialize option structure to indicate that no values have been set. */
235 initialize_options(&options);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000236
Damien Miller95def091999-11-25 00:26:21 +1100237 /* Parse command-line arguments. */
238 host = NULL;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000239
Damien Millerf4614452001-07-14 12:18:10 +1000240again:
241 while ((opt = getopt(ac, av,
Damien Miller0e220db2004-06-15 10:34:08 +1000242 "1246ab:c:e:fgi:kl:m:no:p:qstvxACD:F:I:L:MNPR:S:TVXY")) != -1) {
Damien Miller95def091999-11-25 00:26:21 +1100243 switch (opt) {
Ben Lindstrom1e7d3062001-02-09 02:36:43 +0000244 case '1':
245 options.protocol = SSH_PROTO_1;
246 break;
Damien Miller4af51302000-04-16 11:18:38 +1000247 case '2':
248 options.protocol = SSH_PROTO_2;
249 break;
Damien Miller34132e52000-01-14 15:45:46 +1100250 case '4':
Darren Tucker0a4f04b2003-07-03 20:37:47 +1000251 options.address_family = AF_INET;
Damien Miller34132e52000-01-14 15:45:46 +1100252 break;
Damien Miller34132e52000-01-14 15:45:46 +1100253 case '6':
Darren Tucker0a4f04b2003-07-03 20:37:47 +1000254 options.address_family = AF_INET6;
Damien Miller34132e52000-01-14 15:45:46 +1100255 break;
Damien Miller95def091999-11-25 00:26:21 +1100256 case 'n':
257 stdin_null_flag = 1;
258 break;
Damien Miller95def091999-11-25 00:26:21 +1100259 case 'f':
260 fork_after_authentication_flag = 1;
261 stdin_null_flag = 1;
262 break;
Damien Miller95def091999-11-25 00:26:21 +1100263 case 'x':
264 options.forward_x11 = 0;
265 break;
Damien Miller95def091999-11-25 00:26:21 +1100266 case 'X':
267 options.forward_x11 = 1;
268 break;
Darren Tucker0a118da2003-10-15 15:54:32 +1000269 case 'Y':
270 options.forward_x11 = 1;
271 options.forward_x11_trusted = 1;
272 break;
Damien Miller95def091999-11-25 00:26:21 +1100273 case 'g':
274 options.gateway_ports = 1;
275 break;
Damien Miller147bba32002-09-04 16:46:06 +1000276 case 'P': /* deprecated */
Damien Miller95def091999-11-25 00:26:21 +1100277 options.use_privileged_port = 0;
278 break;
Damien Miller95def091999-11-25 00:26:21 +1100279 case 'a':
280 options.forward_agent = 0;
281 break;
Damien Millerb1715dc2000-05-30 13:44:51 +1000282 case 'A':
283 options.forward_agent = 1;
284 break;
Damien Miller95def091999-11-25 00:26:21 +1100285 case 'k':
Damien Millere0113cc2003-11-24 13:10:09 +1100286 options.gss_deleg_creds = 0;
Damien Miller95def091999-11-25 00:26:21 +1100287 break;
Damien Miller95def091999-11-25 00:26:21 +1100288 case 'i':
289 if (stat(optarg, &st) < 0) {
Damien Millerf4614452001-07-14 12:18:10 +1000290 fprintf(stderr, "Warning: Identity file %s "
291 "does not exist.\n", optarg);
Damien Miller95def091999-11-25 00:26:21 +1100292 break;
293 }
Damien Millerf4614452001-07-14 12:18:10 +1000294 if (options.num_identity_files >=
295 SSH_MAX_IDENTITY_FILES)
296 fatal("Too many identity files specified "
297 "(max %d)", SSH_MAX_IDENTITY_FILES);
298 options.identity_files[options.num_identity_files++] =
299 xstrdup(optarg);
Damien Miller95def091999-11-25 00:26:21 +1100300 break;
Ben Lindstromc5b68002001-07-04 04:52:03 +0000301 case 'I':
302#ifdef SMARTCARD
Ben Lindstromf7db3bb2001-08-06 21:35:51 +0000303 options.smartcard_device = xstrdup(optarg);
Ben Lindstrombcc18082001-08-06 21:59:25 +0000304#else
Ben Lindstromc5b68002001-07-04 04:52:03 +0000305 fprintf(stderr, "no support for smartcards.\n");
Ben Lindstrombcc18082001-08-06 21:59:25 +0000306#endif
Ben Lindstromc5b68002001-07-04 04:52:03 +0000307 break;
Damien Miller95def091999-11-25 00:26:21 +1100308 case 't':
Ben Lindstrom4dccfa52000-12-28 16:40:05 +0000309 if (tty_flag)
310 force_tty_flag = 1;
Damien Miller95def091999-11-25 00:26:21 +1100311 tty_flag = 1;
312 break;
Damien Miller95def091999-11-25 00:26:21 +1100313 case 'v':
Darren Tuckere98dfa32003-07-19 19:54:31 +1000314 if (debug_flag == 0) {
Damien Millere4340be2000-09-16 13:29:08 +1100315 debug_flag = 1;
316 options.log_level = SYSLOG_LEVEL_DEBUG1;
Darren Tuckere98dfa32003-07-19 19:54:31 +1000317 } else {
318 if (options.log_level < SYSLOG_LEVEL_DEBUG3)
319 options.log_level++;
Damien Millere4340be2000-09-16 13:29:08 +1100320 break;
Darren Tuckere98dfa32003-07-19 19:54:31 +1000321 }
Damien Millere4340be2000-09-16 13:29:08 +1100322 /* fallthrough */
Damien Miller95def091999-11-25 00:26:21 +1100323 case 'V':
Damien Miller0c889cd2004-03-22 09:36:00 +1100324 fprintf(stderr, "%s, %s\n",
325 SSH_VERSION, SSLeay_version(SSLEAY_VERSION));
Damien Miller95def091999-11-25 00:26:21 +1100326 if (opt == 'V')
327 exit(0);
Damien Miller95def091999-11-25 00:26:21 +1100328 break;
Damien Miller95def091999-11-25 00:26:21 +1100329 case 'q':
330 options.log_level = SYSLOG_LEVEL_QUIET;
331 break;
Damien Miller95def091999-11-25 00:26:21 +1100332 case 'e':
333 if (optarg[0] == '^' && optarg[2] == 0 &&
Damien Millerf4614452001-07-14 12:18:10 +1000334 (u_char) optarg[1] >= 64 &&
335 (u_char) optarg[1] < 128)
Ben Lindstrom46c16222000-12-22 01:43:59 +0000336 options.escape_char = (u_char) optarg[1] & 31;
Damien Miller95def091999-11-25 00:26:21 +1100337 else if (strlen(optarg) == 1)
Ben Lindstrom46c16222000-12-22 01:43:59 +0000338 options.escape_char = (u_char) optarg[0];
Damien Miller95def091999-11-25 00:26:21 +1100339 else if (strcmp(optarg, "none") == 0)
Ben Lindstrom2b1f71b2001-06-05 20:32:21 +0000340 options.escape_char = SSH_ESCAPECHAR_NONE;
Damien Miller95def091999-11-25 00:26:21 +1100341 else {
Damien Millerf4614452001-07-14 12:18:10 +1000342 fprintf(stderr, "Bad escape character '%s'.\n",
343 optarg);
Damien Miller95def091999-11-25 00:26:21 +1100344 exit(1);
345 }
346 break;
Damien Miller95def091999-11-25 00:26:21 +1100347 case 'c':
Damien Millereba71ba2000-04-29 23:57:08 +1000348 if (ciphers_valid(optarg)) {
349 /* SSH2 only */
350 options.ciphers = xstrdup(optarg);
Damien Miller30c3d422000-05-09 11:02:59 +1000351 options.cipher = SSH_CIPHER_ILLEGAL;
Damien Millereba71ba2000-04-29 23:57:08 +1000352 } else {
353 /* SSH1 only */
Damien Millere39cacc2000-11-29 12:18:44 +1100354 options.cipher = cipher_number(optarg);
355 if (options.cipher == -1) {
Damien Millerf4614452001-07-14 12:18:10 +1000356 fprintf(stderr,
357 "Unknown cipher type '%s'\n",
358 optarg);
Damien Millereba71ba2000-04-29 23:57:08 +1000359 exit(1);
360 }
Damien Millerf4614452001-07-14 12:18:10 +1000361 if (options.cipher == SSH_CIPHER_3DES)
Damien Millere39cacc2000-11-29 12:18:44 +1100362 options.ciphers = "3des-cbc";
Damien Millerf4614452001-07-14 12:18:10 +1000363 else if (options.cipher == SSH_CIPHER_BLOWFISH)
Damien Millere39cacc2000-11-29 12:18:44 +1100364 options.ciphers = "blowfish-cbc";
Damien Millerf4614452001-07-14 12:18:10 +1000365 else
Damien Millere39cacc2000-11-29 12:18:44 +1100366 options.ciphers = (char *)-1;
Damien Miller95def091999-11-25 00:26:21 +1100367 }
368 break;
Ben Lindstrom06b33aa2001-02-15 03:01:59 +0000369 case 'm':
370 if (mac_valid(optarg))
371 options.macs = xstrdup(optarg);
372 else {
Damien Millerf4614452001-07-14 12:18:10 +1000373 fprintf(stderr, "Unknown mac type '%s'\n",
374 optarg);
Ben Lindstrom06b33aa2001-02-15 03:01:59 +0000375 exit(1);
376 }
377 break;
Damien Miller0e220db2004-06-15 10:34:08 +1000378 case 'M':
Damien Millerb8ea2482004-06-18 22:21:55 +1000379 options.control_master =
380 (options.control_master >= 1) ? 2 : 1;
Damien Miller0e220db2004-06-15 10:34:08 +1000381 break;
Damien Miller95def091999-11-25 00:26:21 +1100382 case 'p':
Ben Lindstrom19066a12001-04-12 23:39:26 +0000383 options.port = a2port(optarg);
384 if (options.port == 0) {
Ben Lindstrom146edb92001-04-11 23:06:28 +0000385 fprintf(stderr, "Bad port '%s'\n", optarg);
386 exit(1);
387 }
Damien Miller95def091999-11-25 00:26:21 +1100388 break;
Damien Miller95def091999-11-25 00:26:21 +1100389 case 'l':
390 options.user = optarg;
391 break;
Ben Lindstrom1a174712001-09-12 17:56:15 +0000392
Damien Miller95def091999-11-25 00:26:21 +1100393 case 'L':
Ben Lindstrom1a174712001-09-12 17:56:15 +0000394 case 'R':
Damien Miller1ea71662003-05-14 22:33:58 +1000395 if (sscanf(optarg, "%5[0123456789]:%255[^:]:%5[0123456789]",
Ben Lindstrom1a174712001-09-12 17:56:15 +0000396 sfwd_port, buf, sfwd_host_port) != 3 &&
Damien Miller1ea71662003-05-14 22:33:58 +1000397 sscanf(optarg, "%5[0123456789]/%255[^/]/%5[0123456789]",
Ben Lindstrom1a174712001-09-12 17:56:15 +0000398 sfwd_port, buf, sfwd_host_port) != 3) {
Damien Millerf4614452001-07-14 12:18:10 +1000399 fprintf(stderr,
Ben Lindstrom1a174712001-09-12 17:56:15 +0000400 "Bad forwarding specification '%s'\n",
Damien Millerf4614452001-07-14 12:18:10 +1000401 optarg);
Damien Miller95def091999-11-25 00:26:21 +1100402 usage();
403 /* NOTREACHED */
404 }
Ben Lindstrom1a174712001-09-12 17:56:15 +0000405 if ((fwd_port = a2port(sfwd_port)) == 0 ||
Ben Lindstrom6328ab32002-03-22 02:54:23 +0000406 (fwd_host_port = a2port(sfwd_host_port)) == 0) {
Ben Lindstrom1a174712001-09-12 17:56:15 +0000407 fprintf(stderr,
408 "Bad forwarding port(s) '%s'\n", optarg);
409 exit(1);
410 }
411 if (opt == 'L')
412 add_local_forward(&options, fwd_port, buf,
413 fwd_host_port);
414 else if (opt == 'R')
415 add_remote_forward(&options, fwd_port, buf,
Damien Miller9f0f5c62001-12-21 14:45:46 +1100416 fwd_host_port);
Damien Miller95def091999-11-25 00:26:21 +1100417 break;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000418
419 case 'D':
Ben Lindstrom19066a12001-04-12 23:39:26 +0000420 fwd_port = a2port(optarg);
421 if (fwd_port == 0) {
Damien Millerf4614452001-07-14 12:18:10 +1000422 fprintf(stderr, "Bad dynamic port '%s'\n",
423 optarg);
Ben Lindstrom146edb92001-04-11 23:06:28 +0000424 exit(1);
425 }
Darren Tucker1c52ee32003-08-13 20:38:36 +1000426 add_local_forward(&options, fwd_port, "socks", 0);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000427 break;
428
Damien Miller95def091999-11-25 00:26:21 +1100429 case 'C':
430 options.compression = 1;
431 break;
Damien Miller1383bd82000-04-06 12:32:37 +1000432 case 'N':
433 no_shell_flag = 1;
434 no_tty_flag = 1;
435 break;
Damien Miller1383bd82000-04-06 12:32:37 +1000436 case 'T':
437 no_tty_flag = 1;
438 break;
Damien Miller95def091999-11-25 00:26:21 +1100439 case 'o':
440 dummy = 1;
Damien Miller9836cf82003-12-17 16:30:06 +1100441 line = xstrdup(optarg);
Damien Millerf4614452001-07-14 12:18:10 +1000442 if (process_config_line(&options, host ? host : "",
Damien Miller9836cf82003-12-17 16:30:06 +1100443 line, "command-line", 0, &dummy) != 0)
Damien Miller95def091999-11-25 00:26:21 +1100444 exit(1);
Damien Miller9836cf82003-12-17 16:30:06 +1100445 xfree(line);
Damien Miller95def091999-11-25 00:26:21 +1100446 break;
Damien Miller832562e2001-01-30 09:30:01 +1100447 case 's':
448 subsystem_flag = 1;
449 break;
Damien Miller0e220db2004-06-15 10:34:08 +1000450 case 'S':
451 if (options.control_path != NULL)
452 free(options.control_path);
453 options.control_path = xstrdup(optarg);
Damien Miller0e220db2004-06-15 10:34:08 +1000454 break;
Ben Lindstrome0f88042001-04-30 13:06:24 +0000455 case 'b':
456 options.bind_address = optarg;
457 break;
Ben Lindstrom14f31ab2001-09-12 17:48:04 +0000458 case 'F':
459 config = optarg;
460 break;
Damien Miller95def091999-11-25 00:26:21 +1100461 default:
462 usage();
463 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000464 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000465
Damien Millerf4614452001-07-14 12:18:10 +1000466 ac -= optind;
467 av += optind;
468
469 if (ac > 0 && !host && **av != '-') {
Ben Lindstromc276c122002-12-23 02:14:51 +0000470 if (strrchr(*av, '@')) {
Damien Millerf4614452001-07-14 12:18:10 +1000471 p = xstrdup(*av);
Ben Lindstromc276c122002-12-23 02:14:51 +0000472 cp = strrchr(p, '@');
Damien Millerf4614452001-07-14 12:18:10 +1000473 if (cp == NULL || cp == p)
474 usage();
475 options.user = p;
476 *cp = '\0';
477 host = ++cp;
478 } else
479 host = *av;
Ben Lindstromb9fa6912002-12-23 02:24:54 +0000480 if (ac > 1) {
481 optind = optreset = 1;
Damien Millerf4614452001-07-14 12:18:10 +1000482 goto again;
483 }
Ben Lindstromb9fa6912002-12-23 02:24:54 +0000484 ac--, av++;
Damien Millerf4614452001-07-14 12:18:10 +1000485 }
486
Damien Miller95def091999-11-25 00:26:21 +1100487 /* Check that we got a host name. */
488 if (!host)
489 usage();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000490
Damien Millercb5e44a2000-09-29 12:12:36 +1100491 SSLeay_add_all_algorithms();
Damien Miller0bc1bd82000-11-13 22:57:25 +1100492 ERR_load_crypto_strings();
Damien Millercb5e44a2000-09-29 12:12:36 +1100493
Damien Miller95def091999-11-25 00:26:21 +1100494 /* Initialize the command to execute on remote host. */
495 buffer_init(&command);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000496
Damien Miller5428f641999-11-25 11:54:57 +1100497 /*
498 * Save the command to execute on the remote host in a buffer. There
499 * is no limit on the length of the command, except by the maximum
500 * packet size. Also sets the tty flag if there is no command.
501 */
Damien Millerf4614452001-07-14 12:18:10 +1000502 if (!ac) {
Damien Miller95def091999-11-25 00:26:21 +1100503 /* No command specified - execute shell on a tty. */
504 tty_flag = 1;
Damien Miller832562e2001-01-30 09:30:01 +1100505 if (subsystem_flag) {
Damien Millerf4614452001-07-14 12:18:10 +1000506 fprintf(stderr,
507 "You must specify a subsystem to invoke.\n");
Damien Miller832562e2001-01-30 09:30:01 +1100508 usage();
509 }
Damien Miller95def091999-11-25 00:26:21 +1100510 } else {
Damien Millerf4614452001-07-14 12:18:10 +1000511 /* A command has been specified. Store it into the buffer. */
512 for (i = 0; i < ac; i++) {
513 if (i)
Damien Miller95def091999-11-25 00:26:21 +1100514 buffer_append(&command, " ", 1);
515 buffer_append(&command, av[i], strlen(av[i]));
516 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000517 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000518
Damien Miller95def091999-11-25 00:26:21 +1100519 /* Cannot fork to background if no command. */
Damien Millercaf6dd62000-08-29 11:33:50 +1100520 if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag)
Damien Miller95def091999-11-25 00:26:21 +1100521 fatal("Cannot fork into background without a command to execute.");
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000522
Damien Miller95def091999-11-25 00:26:21 +1100523 /* Allocate a tty by default if no command specified. */
524 if (buffer_len(&command) == 0)
525 tty_flag = 1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000526
Ben Lindstroma962c2f2002-07-04 00:14:17 +0000527 /* Force no tty */
Ben Lindstromc72745a2000-12-02 19:03:54 +0000528 if (no_tty_flag)
529 tty_flag = 0;
Damien Miller95def091999-11-25 00:26:21 +1100530 /* Do not allocate a tty if stdin is not a tty. */
Ben Lindstrom4dccfa52000-12-28 16:40:05 +0000531 if (!isatty(fileno(stdin)) && !force_tty_flag) {
Damien Miller95def091999-11-25 00:26:21 +1100532 if (tty_flag)
Damien Miller996acd22003-04-09 20:59:48 +1000533 logit("Pseudo-terminal will not be allocated because stdin is not a terminal.");
Damien Miller95def091999-11-25 00:26:21 +1100534 tty_flag = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000535 }
Damien Miller1383bd82000-04-06 12:32:37 +1000536
Ben Lindstrom8a432f52001-03-05 07:24:46 +0000537 /*
538 * Initialize "log" output. Since we are the client all output
539 * actually goes to stderr.
540 */
Ben Lindstrom2b646522001-04-12 16:16:57 +0000541 log_init(av[0], options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level,
542 SYSLOG_FACILITY_USER, 1);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000543
Ben Lindstrom14f31ab2001-09-12 17:48:04 +0000544 /*
545 * Read per-user configuration file. Ignore the system wide config
546 * file if the user specifies a config file on the command line.
547 */
548 if (config != NULL) {
Damien Miller914420f2004-04-20 20:14:07 +1000549 if (!read_config_file(config, host, &options, 0))
Ben Lindstromedc0cf22001-09-12 18:32:20 +0000550 fatal("Can't open user config file %.100s: "
551 "%.100s", config, strerror(errno));
Ben Lindstrom14f31ab2001-09-12 17:48:04 +0000552 } else {
553 snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir,
554 _PATH_SSH_USER_CONFFILE);
Damien Miller57a44762004-04-20 20:11:57 +1000555 (void)read_config_file(buf, host, &options, 1);
Ben Lindstrom83f07d12001-10-03 17:22:29 +0000556
557 /* Read systemwide configuration file after use config. */
Damien Miller57a44762004-04-20 20:11:57 +1000558 (void)read_config_file(_PATH_HOST_CONFIG_FILE, host,
559 &options, 0);
Ben Lindstrom14f31ab2001-09-12 17:48:04 +0000560 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000561
Damien Miller95def091999-11-25 00:26:21 +1100562 /* Fill configuration defaults. */
563 fill_default_options(&options);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000564
Darren Tucker0a4f04b2003-07-03 20:37:47 +1000565 channel_set_af(options.address_family);
566
Damien Miller95def091999-11-25 00:26:21 +1100567 /* reinit */
Ben Lindstrom8a432f52001-03-05 07:24:46 +0000568 log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 1);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000569
Damien Miller60bc5172001-03-19 09:38:15 +1100570 seed_rng();
571
Damien Miller95def091999-11-25 00:26:21 +1100572 if (options.user == NULL)
573 options.user = xstrdup(pw->pw_name);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000574
Damien Miller95def091999-11-25 00:26:21 +1100575 if (options.hostname != NULL)
576 host = options.hostname;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000577
Darren Tucker3f521e22003-07-03 16:20:42 +1000578 /* force lowercase for hostkey matching */
579 if (options.host_key_alias != NULL) {
580 for (p = options.host_key_alias; *p; p++)
581 if (isupper(*p))
582 *p = tolower(*p);
583 }
584
Damien Miller9f1e33a2003-02-24 11:57:32 +1100585 if (options.proxy_command != NULL &&
586 strcmp(options.proxy_command, "none") == 0)
587 options.proxy_command = NULL;
588
Damien Miller0e220db2004-06-15 10:34:08 +1000589 if (options.control_path != NULL) {
590 options.control_path = tilde_expand_filename(
591 options.control_path, original_real_uid);
592 }
593 if (options.control_path != NULL && options.control_master == 0)
594 control_client(options.control_path); /* This doesn't return */
595
Kevin Stevesfcec7f82000-12-15 19:55:48 +0000596 /* Open a connection to the remote host. */
Darren Tucker0a4f04b2003-07-03 20:37:47 +1000597 if (ssh_connect(host, &hostaddr, options.port,
598 options.address_family, options.connection_attempts,
Ben Lindstrom1aa64272002-06-11 20:28:05 +0000599#ifdef HAVE_CYGWIN
600 options.use_privileged_port,
601#else
Ben Lindstromf9c48842002-06-11 16:37:51 +0000602 original_effective_uid == 0 && options.use_privileged_port,
Ben Lindstrom1aa64272002-06-11 20:28:05 +0000603#endif
Ben Lindstromda394ca2002-06-12 16:11:12 +0000604 options.proxy_command) != 0)
Ben Lindstrom24157572002-06-12 16:09:39 +0000605 exit(1);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000606
Damien Miller5428f641999-11-25 11:54:57 +1100607 /*
608 * If we successfully made the connection, load the host private key
609 * in case we will need it later for combined rsa-rhosts
610 * authentication. This must be done before releasing extra
611 * privileges, because the file is only readable by root.
Ben Lindstrom9e5bb572002-06-06 19:58:27 +0000612 * If we cannot access the private keys, load the public keys
613 * instead and try to execute the ssh-keysign helper instead.
Damien Miller5428f641999-11-25 11:54:57 +1100614 */
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000615 sensitive_data.nkeys = 0;
616 sensitive_data.keys = NULL;
Ben Lindstrom1bad2562002-06-06 19:57:33 +0000617 sensitive_data.external_keysign = 0;
Ben Lindstrom24157572002-06-12 16:09:39 +0000618 if (options.rhosts_rsa_authentication ||
619 options.hostbased_authentication) {
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000620 sensitive_data.nkeys = 3;
Ben Lindstroma962c2f2002-07-04 00:14:17 +0000621 sensitive_data.keys = xmalloc(sensitive_data.nkeys *
622 sizeof(Key));
Ben Lindstromf9c48842002-06-11 16:37:51 +0000623
624 PRIV_START;
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000625 sensitive_data.keys[0] = key_load_private_type(KEY_RSA1,
Ben Lindstromd0fca422001-03-26 13:44:06 +0000626 _PATH_HOST_KEY_FILE, "", NULL);
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000627 sensitive_data.keys[1] = key_load_private_type(KEY_DSA,
628 _PATH_HOST_DSA_KEY_FILE, "", NULL);
629 sensitive_data.keys[2] = key_load_private_type(KEY_RSA,
630 _PATH_HOST_RSA_KEY_FILE, "", NULL);
Ben Lindstromf9c48842002-06-11 16:37:51 +0000631 PRIV_END;
Ben Lindstrom1bad2562002-06-06 19:57:33 +0000632
Ben Lindstrom5d35a2f2002-07-04 00:19:40 +0000633 if (options.hostbased_authentication == 1 &&
634 sensitive_data.keys[0] == NULL &&
Ben Lindstrom1bad2562002-06-06 19:57:33 +0000635 sensitive_data.keys[1] == NULL &&
636 sensitive_data.keys[2] == NULL) {
637 sensitive_data.keys[1] = key_load_public(
638 _PATH_HOST_DSA_KEY_FILE, NULL);
639 sensitive_data.keys[2] = key_load_public(
640 _PATH_HOST_RSA_KEY_FILE, NULL);
641 sensitive_data.external_keysign = 1;
642 }
Damien Miller95def091999-11-25 00:26:21 +1100643 }
Damien Miller5428f641999-11-25 11:54:57 +1100644 /*
645 * Get rid of any extra privileges that we may have. We will no
646 * longer need them. Also, extra privileges could make it very hard
647 * to read identity files and other non-world-readable files from the
648 * user's home directory if it happens to be on a NFS volume where
649 * root is mapped to nobody.
650 */
Ben Lindstromf9c48842002-06-11 16:37:51 +0000651 seteuid(original_real_uid);
652 setuid(original_real_uid);
Damien Miller95def091999-11-25 00:26:21 +1100653
Damien Miller5428f641999-11-25 11:54:57 +1100654 /*
655 * Now that we are back to our own permissions, create ~/.ssh
656 * directory if it doesn\'t already exist.
657 */
Ben Lindstrom930b14a2001-08-15 23:19:21 +0000658 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 +1100659 if (stat(buf, &st) < 0)
Damien Millerbe484b52000-07-15 14:14:16 +1000660 if (mkdir(buf, 0700) < 0)
Damien Miller95def091999-11-25 00:26:21 +1100661 error("Could not create directory '%.200s'.", buf);
662
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000663 /* load options.identity_files */
664 load_public_identity_files();
665
666 /* Expand ~ in known host file names. */
667 /* XXX mem-leaks: */
Damien Miller0bc1bd82000-11-13 22:57:25 +1100668 options.system_hostfile =
669 tilde_expand_filename(options.system_hostfile, original_real_uid);
670 options.user_hostfile =
671 tilde_expand_filename(options.user_hostfile, original_real_uid);
672 options.system_hostfile2 =
673 tilde_expand_filename(options.system_hostfile2, original_real_uid);
674 options.user_hostfile2 =
675 tilde_expand_filename(options.user_hostfile2, original_real_uid);
Damien Miller95def091999-11-25 00:26:21 +1100676
Damien Miller07cd5892001-11-12 10:52:03 +1100677 signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
678
Damien Miller95def091999-11-25 00:26:21 +1100679 /* Log into the remote system. This never returns if the login fails. */
Ben Lindstrom1bad2562002-06-06 19:57:33 +0000680 ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr, pw);
Damien Miller95def091999-11-25 00:26:21 +1100681
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000682 /* We no longer need the private host keys. Clear them now. */
683 if (sensitive_data.nkeys != 0) {
684 for (i = 0; i < sensitive_data.nkeys; i++) {
685 if (sensitive_data.keys[i] != NULL) {
686 /* Destroys contents safely */
687 debug3("clear hostkey %d", i);
688 key_free(sensitive_data.keys[i]);
689 sensitive_data.keys[i] = NULL;
690 }
691 }
692 xfree(sensitive_data.keys);
693 }
Ben Lindstroma6c8a8d2001-08-06 21:42:00 +0000694 for (i = 0; i < options.num_identity_files; i++) {
695 if (options.identity_files[i]) {
696 xfree(options.identity_files[i]);
697 options.identity_files[i] = NULL;
698 }
699 if (options.identity_keys[i]) {
700 key_free(options.identity_keys[i]);
701 options.identity_keys[i] = NULL;
702 }
703 }
Damien Miller95def091999-11-25 00:26:21 +1100704
Damien Miller1383bd82000-04-06 12:32:37 +1000705 exit_status = compat20 ? ssh_session2() : ssh_session();
706 packet_close();
Damien Miller8c4e18a2002-09-19 12:05:02 +1000707
Damien Miller0e220db2004-06-15 10:34:08 +1000708 if (options.control_path != NULL && control_fd != -1)
709 unlink(options.control_path);
710
Damien Miller8c4e18a2002-09-19 12:05:02 +1000711 /*
Damien Millera8e06ce2003-11-21 23:48:55 +1100712 * Send SIGHUP to proxy command if used. We don't wait() in
Damien Miller8c4e18a2002-09-19 12:05:02 +1000713 * case it hangs and instead rely on init to reap the child
714 */
715 if (proxy_command_pid > 1)
716 kill(proxy_command_pid, SIGHUP);
717
Damien Miller1383bd82000-04-06 12:32:37 +1000718 return exit_status;
719}
720
Darren Tucker0a118da2003-10-15 15:54:32 +1000721#define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
722
Ben Lindstrombba81212001-06-25 05:01:22 +0000723static void
Ben Lindstrom4a4bd712001-12-06 17:45:19 +0000724x11_get_proto(char **_proto, char **_data)
Damien Millerbd483e72000-04-30 10:00:53 +1000725{
Darren Tucker0a118da2003-10-15 15:54:32 +1000726 char cmd[1024];
Damien Millerbd483e72000-04-30 10:00:53 +1000727 char line[512];
Darren Tucker0a118da2003-10-15 15:54:32 +1000728 char xdisplay[512];
Ben Lindstrom4a4bd712001-12-06 17:45:19 +0000729 static char proto[512], data[512];
Damien Millerbd483e72000-04-30 10:00:53 +1000730 FILE *f;
Darren Tucker0a118da2003-10-15 15:54:32 +1000731 int got_data = 0, generated = 0, do_unlink = 0, i;
732 char *display, *xauthdir, *xauthfile;
Ben Lindstromee8d52d2002-07-23 21:03:02 +0000733 struct stat st;
Damien Millerbd483e72000-04-30 10:00:53 +1000734
Darren Tucker0a118da2003-10-15 15:54:32 +1000735 xauthdir = xauthfile = NULL;
Ben Lindstrom4a4bd712001-12-06 17:45:19 +0000736 *_proto = proto;
737 *_data = data;
738 proto[0] = data[0] = '\0';
Darren Tucker0a118da2003-10-15 15:54:32 +1000739
Ben Lindstromee8d52d2002-07-23 21:03:02 +0000740 if (!options.xauth_location ||
741 (stat(options.xauth_location, &st) == -1)) {
742 debug("No xauth program.");
743 } else {
744 if ((display = getenv("DISPLAY")) == NULL) {
745 debug("x11_get_proto: DISPLAY not set");
746 return;
747 }
Darren Tucker0a118da2003-10-15 15:54:32 +1000748 /*
749 * Handle FamilyLocal case where $DISPLAY does
750 * not match an authorization entry. For this we
751 * just try "xauth list unix:displaynum.screennum".
752 * XXX: "localhost" match to determine FamilyLocal
753 * is not perfect.
754 */
755 if (strncmp(display, "localhost:", 10) == 0) {
756 snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
757 display + 10);
758 display = xdisplay;
759 }
760 if (options.forward_x11_trusted == 0) {
761 xauthdir = xmalloc(MAXPATHLEN);
762 xauthfile = xmalloc(MAXPATHLEN);
763 strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN);
764 if (mkdtemp(xauthdir) != NULL) {
765 do_unlink = 1;
766 snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile",
767 xauthdir);
768 snprintf(cmd, sizeof(cmd),
769 "%s -f %s generate %s " SSH_X11_PROTO
Damien Miller3df755e2004-03-22 09:34:26 +1100770 " untrusted timeout 1200 2>" _PATH_DEVNULL,
Darren Tucker0a118da2003-10-15 15:54:32 +1000771 options.xauth_location, xauthfile, display);
772 debug2("x11_get_proto: %s", cmd);
773 if (system(cmd) == 0)
774 generated = 1;
775 }
776 }
777 snprintf(cmd, sizeof(cmd),
778 "%s %s%s list %s . 2>" _PATH_DEVNULL,
779 options.xauth_location,
780 generated ? "-f " : "" ,
781 generated ? xauthfile : "",
782 display);
783 debug2("x11_get_proto: %s", cmd);
784 f = popen(cmd, "r");
Damien Millerd3a18572000-06-07 19:55:44 +1000785 if (f && fgets(line, sizeof(line), f) &&
Ben Lindstrom4a4bd712001-12-06 17:45:19 +0000786 sscanf(line, "%*s %511s %511s", proto, data) == 2)
Damien Millerd3a18572000-06-07 19:55:44 +1000787 got_data = 1;
788 if (f)
789 pclose(f);
790 }
Darren Tucker0a118da2003-10-15 15:54:32 +1000791
792 if (do_unlink) {
793 unlink(xauthfile);
794 rmdir(xauthdir);
795 }
796 if (xauthdir)
797 xfree(xauthdir);
798 if (xauthfile)
799 xfree(xauthfile);
800
Damien Millerbd483e72000-04-30 10:00:53 +1000801 /*
802 * If we didn't get authentication data, just make up some
803 * data. The forwarding code will check the validity of the
804 * response anyway, and substitute this data. The X11
805 * server, however, will ignore this fake data and use
806 * whatever authentication mechanisms it was using otherwise
807 * for the local connection.
808 */
809 if (!got_data) {
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000810 u_int32_t rnd = 0;
Damien Millerbd483e72000-04-30 10:00:53 +1000811
Darren Tucker0a118da2003-10-15 15:54:32 +1000812 logit("Warning: No xauth data; "
813 "using fake authentication data for X11 forwarding.");
814 strlcpy(proto, SSH_X11_PROTO, sizeof proto);
Damien Millerbd483e72000-04-30 10:00:53 +1000815 for (i = 0; i < 16; i++) {
816 if (i % 4 == 0)
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000817 rnd = arc4random();
Darren Tucker0a118da2003-10-15 15:54:32 +1000818 snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000819 rnd & 0xff);
820 rnd >>= 8;
Damien Millerbd483e72000-04-30 10:00:53 +1000821 }
822 }
823}
824
Ben Lindstrombba81212001-06-25 05:01:22 +0000825static void
Damien Miller0bc1bd82000-11-13 22:57:25 +1100826ssh_init_forwarding(void)
827{
Kevin Steves12057502001-02-05 14:54:34 +0000828 int success = 0;
Damien Miller0bc1bd82000-11-13 22:57:25 +1100829 int i;
Kevin Steves12057502001-02-05 14:54:34 +0000830
Damien Miller0bc1bd82000-11-13 22:57:25 +1100831 /* Initiate local TCP/IP port forwardings. */
832 for (i = 0; i < options.num_local_forwards; i++) {
833 debug("Connections to local port %d forwarded to remote address %.200s:%d",
834 options.local_forwards[i].port,
835 options.local_forwards[i].host,
836 options.local_forwards[i].host_port);
Damien Millerb16461c2002-01-22 23:29:22 +1100837 success += channel_setup_local_fwd_listener(
Damien Miller0bc1bd82000-11-13 22:57:25 +1100838 options.local_forwards[i].port,
839 options.local_forwards[i].host,
840 options.local_forwards[i].host_port,
841 options.gateway_ports);
842 }
Kevin Steves12057502001-02-05 14:54:34 +0000843 if (i > 0 && success == 0)
844 error("Could not request local forwarding.");
Damien Miller0bc1bd82000-11-13 22:57:25 +1100845
846 /* Initiate remote TCP/IP port forwardings. */
847 for (i = 0; i < options.num_remote_forwards; i++) {
848 debug("Connections to remote port %d forwarded to local address %.200s:%d",
849 options.remote_forwards[i].port,
850 options.remote_forwards[i].host,
851 options.remote_forwards[i].host_port);
852 channel_request_remote_forwarding(
853 options.remote_forwards[i].port,
854 options.remote_forwards[i].host,
855 options.remote_forwards[i].host_port);
856 }
857}
858
Ben Lindstrombba81212001-06-25 05:01:22 +0000859static void
Damien Miller0bc1bd82000-11-13 22:57:25 +1100860check_agent_present(void)
861{
862 if (options.forward_agent) {
863 /* Clear agent forwarding if we don\'t have an agent. */
Damien Miller789e95d2002-09-12 09:52:46 +1000864 if (!ssh_agent_present())
Damien Miller0bc1bd82000-11-13 22:57:25 +1100865 options.forward_agent = 0;
Damien Miller0bc1bd82000-11-13 22:57:25 +1100866 }
867}
868
Ben Lindstrombba81212001-06-25 05:01:22 +0000869static int
Damien Miller1383bd82000-04-06 12:32:37 +1000870ssh_session(void)
871{
872 int type;
Damien Miller1383bd82000-04-06 12:32:37 +1000873 int interactive = 0;
874 int have_tty = 0;
875 struct winsize ws;
Damien Miller1383bd82000-04-06 12:32:37 +1000876 char *cp;
877
Damien Miller95def091999-11-25 00:26:21 +1100878 /* Enable compression if requested. */
879 if (options.compression) {
880 debug("Requesting compression at level %d.", options.compression_level);
881
882 if (options.compression_level < 1 || options.compression_level > 9)
883 fatal("Compression level must be from 1 (fast) to 9 (slow, best).");
884
885 /* Send the request. */
886 packet_start(SSH_CMSG_REQUEST_COMPRESSION);
887 packet_put_int(options.compression_level);
888 packet_send();
889 packet_write_wait();
Damien Millerdff50992002-01-22 23:16:32 +1100890 type = packet_read();
Damien Miller95def091999-11-25 00:26:21 +1100891 if (type == SSH_SMSG_SUCCESS)
892 packet_start_compression(options.compression_level);
893 else if (type == SSH_SMSG_FAILURE)
Damien Miller996acd22003-04-09 20:59:48 +1000894 logit("Warning: Remote host refused compression.");
Damien Miller95def091999-11-25 00:26:21 +1100895 else
896 packet_disconnect("Protocol error waiting for compression response.");
897 }
898 /* Allocate a pseudo tty if appropriate. */
899 if (tty_flag) {
900 debug("Requesting pty.");
901
902 /* Start the packet. */
903 packet_start(SSH_CMSG_REQUEST_PTY);
904
905 /* Store TERM in the packet. There is no limit on the
906 length of the string. */
907 cp = getenv("TERM");
908 if (!cp)
909 cp = "";
Ben Lindstrom664408d2001-06-09 01:42:01 +0000910 packet_put_cstring(cp);
Damien Miller95def091999-11-25 00:26:21 +1100911
912 /* Store window size in the packet. */
913 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
914 memset(&ws, 0, sizeof(ws));
915 packet_put_int(ws.ws_row);
916 packet_put_int(ws.ws_col);
917 packet_put_int(ws.ws_xpixel);
918 packet_put_int(ws.ws_ypixel);
919
920 /* Store tty modes in the packet. */
Ben Lindstromae8e2d32001-04-14 23:13:02 +0000921 tty_make_modes(fileno(stdin), NULL);
Damien Miller95def091999-11-25 00:26:21 +1100922
923 /* Send the packet, and wait for it to leave. */
924 packet_send();
925 packet_write_wait();
926
927 /* Read response from the server. */
Damien Millerdff50992002-01-22 23:16:32 +1100928 type = packet_read();
Damien Miller450a7a12000-03-26 13:04:51 +1000929 if (type == SSH_SMSG_SUCCESS) {
Damien Miller95def091999-11-25 00:26:21 +1100930 interactive = 1;
Damien Miller1383bd82000-04-06 12:32:37 +1000931 have_tty = 1;
Damien Miller450a7a12000-03-26 13:04:51 +1000932 } else if (type == SSH_SMSG_FAILURE)
Damien Miller996acd22003-04-09 20:59:48 +1000933 logit("Warning: Remote host failed or refused to allocate a pseudo tty.");
Damien Miller95def091999-11-25 00:26:21 +1100934 else
935 packet_disconnect("Protocol error waiting for pty request response.");
936 }
937 /* Request X11 forwarding if enabled and DISPLAY is set. */
938 if (options.forward_x11 && getenv("DISPLAY") != NULL) {
Ben Lindstrom4a4bd712001-12-06 17:45:19 +0000939 char *proto, *data;
Damien Millerbd483e72000-04-30 10:00:53 +1000940 /* Get reasonable local authentication information. */
Ben Lindstrom4a4bd712001-12-06 17:45:19 +0000941 x11_get_proto(&proto, &data);
Damien Millerbd483e72000-04-30 10:00:53 +1000942 /* Request forwarding with authentication spoofing. */
Damien Miller95def091999-11-25 00:26:21 +1100943 debug("Requesting X11 forwarding with authentication spoofing.");
Damien Millerbd483e72000-04-30 10:00:53 +1000944 x11_request_forwarding_with_spoofing(0, proto, data);
Damien Miller95def091999-11-25 00:26:21 +1100945
946 /* Read response from the server. */
Damien Millerdff50992002-01-22 23:16:32 +1100947 type = packet_read();
Damien Miller95def091999-11-25 00:26:21 +1100948 if (type == SSH_SMSG_SUCCESS) {
Damien Miller95def091999-11-25 00:26:21 +1100949 interactive = 1;
Damien Millerbd483e72000-04-30 10:00:53 +1000950 } else if (type == SSH_SMSG_FAILURE) {
Damien Miller996acd22003-04-09 20:59:48 +1000951 logit("Warning: Remote host denied X11 forwarding.");
Damien Millerbd483e72000-04-30 10:00:53 +1000952 } else {
Damien Miller95def091999-11-25 00:26:21 +1100953 packet_disconnect("Protocol error waiting for X11 forwarding");
Damien Millerbd483e72000-04-30 10:00:53 +1000954 }
Damien Miller95def091999-11-25 00:26:21 +1100955 }
956 /* Tell the packet module whether this is an interactive session. */
Ben Lindstrombf555ba2001-01-18 02:04:35 +0000957 packet_set_interactive(interactive);
Damien Miller95def091999-11-25 00:26:21 +1100958
959 /* Request authentication agent forwarding if appropriate. */
Damien Miller0bc1bd82000-11-13 22:57:25 +1100960 check_agent_present();
961
Damien Miller95def091999-11-25 00:26:21 +1100962 if (options.forward_agent) {
963 debug("Requesting authentication agent forwarding.");
964 auth_request_forwarding();
965
966 /* Read response from the server. */
Damien Millerdff50992002-01-22 23:16:32 +1100967 type = packet_read();
Damien Miller48b03fc2002-01-22 23:11:40 +1100968 packet_check_eom();
Damien Miller95def091999-11-25 00:26:21 +1100969 if (type != SSH_SMSG_SUCCESS)
Damien Miller996acd22003-04-09 20:59:48 +1000970 logit("Warning: Remote host denied authentication agent forwarding.");
Damien Miller95def091999-11-25 00:26:21 +1100971 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000972
Damien Miller0bc1bd82000-11-13 22:57:25 +1100973 /* Initiate port forwardings. */
974 ssh_init_forwarding();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000975
Damien Miller5428f641999-11-25 11:54:57 +1100976 /* If requested, let ssh continue in the background. */
Damien Miller4af51302000-04-16 11:18:38 +1000977 if (fork_after_authentication_flag)
Damien Miller5428f641999-11-25 11:54:57 +1100978 if (daemon(1, 1) < 0)
979 fatal("daemon() failed: %.200s", strerror(errno));
980
981 /*
982 * If a command was specified on the command line, execute the
983 * command now. Otherwise request the server to start a shell.
984 */
Damien Miller95def091999-11-25 00:26:21 +1100985 if (buffer_len(&command) > 0) {
986 int len = buffer_len(&command);
987 if (len > 900)
988 len = 900;
Damien Miller5a6b4fe2001-12-21 14:56:54 +1100989 debug("Sending command: %.*s", len, (u_char *)buffer_ptr(&command));
Damien Miller95def091999-11-25 00:26:21 +1100990 packet_start(SSH_CMSG_EXEC_CMD);
991 packet_put_string(buffer_ptr(&command), buffer_len(&command));
992 packet_send();
993 packet_write_wait();
994 } else {
995 debug("Requesting shell.");
996 packet_start(SSH_CMSG_EXEC_SHELL);
997 packet_send();
998 packet_write_wait();
999 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001000
Damien Miller95def091999-11-25 00:26:21 +11001001 /* Enter the interactive session. */
Ben Lindstrom2b1f71b2001-06-05 20:32:21 +00001002 return client_loop(have_tty, tty_flag ?
1003 options.escape_char : SSH_ESCAPECHAR_NONE, 0);
Damien Miller1383bd82000-04-06 12:32:37 +10001004}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001005
Ben Lindstrombba81212001-06-25 05:01:22 +00001006static void
Damien Miller0e220db2004-06-15 10:34:08 +10001007ssh_subsystem_reply(int type, u_int32_t seq, void *ctxt)
Ben Lindstrom1e7d3062001-02-09 02:36:43 +00001008{
1009 int id, len;
1010
1011 id = packet_get_int();
1012 len = buffer_len(&command);
Ben Lindstrom4040fe12001-03-05 06:52:57 +00001013 if (len > 900)
1014 len = 900;
Damien Miller48b03fc2002-01-22 23:11:40 +11001015 packet_check_eom();
Ben Lindstrom1e7d3062001-02-09 02:36:43 +00001016 if (type == SSH2_MSG_CHANNEL_FAILURE)
1017 fatal("Request for subsystem '%.*s' failed on channel %d",
Damien Miller5a6b4fe2001-12-21 14:56:54 +11001018 len, (u_char *)buffer_ptr(&command), id);
Ben Lindstrom1e7d3062001-02-09 02:36:43 +00001019}
1020
Damien Miller2797f7f2002-04-23 21:09:44 +10001021void
Damien Miller509b0102003-12-17 16:33:10 +11001022client_global_request_reply_fwd(int type, u_int32_t seq, void *ctxt)
Damien Miller2797f7f2002-04-23 21:09:44 +10001023{
1024 int i;
1025
1026 i = client_global_request_id++;
Damien Miller509b0102003-12-17 16:33:10 +11001027 if (i >= options.num_remote_forwards)
Damien Miller2797f7f2002-04-23 21:09:44 +10001028 return;
Damien Miller2797f7f2002-04-23 21:09:44 +10001029 debug("remote forward %s for: listen %d, connect %s:%d",
1030 type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
1031 options.remote_forwards[i].port,
1032 options.remote_forwards[i].host,
1033 options.remote_forwards[i].host_port);
1034 if (type == SSH2_MSG_REQUEST_FAILURE)
Damien Miller996acd22003-04-09 20:59:48 +10001035 logit("Warning: remote port forwarding failed for listen port %d",
Damien Miller2797f7f2002-04-23 21:09:44 +10001036 options.remote_forwards[i].port);
1037}
1038
Damien Miller0e220db2004-06-15 10:34:08 +10001039static void
1040ssh_control_listener(void)
1041{
1042 struct sockaddr_un addr;
1043 mode_t old_umask;
Damien Miller07b6ff12004-06-15 11:14:45 +10001044 int addr_len;
1045
Damien Miller23f07702004-06-18 01:19:03 +10001046 if (options.control_path == NULL || options.control_master <= 0)
Damien Miller0e220db2004-06-15 10:34:08 +10001047 return;
1048
1049 memset(&addr, '\0', sizeof(addr));
1050 addr.sun_family = AF_UNIX;
Damien Miller07b6ff12004-06-15 11:14:45 +10001051 addr_len = offsetof(struct sockaddr_un, sun_path) +
Damien Miller0e220db2004-06-15 10:34:08 +10001052 strlen(options.control_path) + 1;
1053
1054 if (strlcpy(addr.sun_path, options.control_path,
1055 sizeof(addr.sun_path)) >= sizeof(addr.sun_path))
1056 fatal("ControlPath too long");
1057
1058 if ((control_fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0)
1059 fatal("%s socket(): %s\n", __func__, strerror(errno));
1060
1061 old_umask = umask(0177);
Damien Miller07b6ff12004-06-15 11:14:45 +10001062 if (bind(control_fd, (struct sockaddr*)&addr, addr_len) == -1) {
Damien Miller0e220db2004-06-15 10:34:08 +10001063 control_fd = -1;
1064 if (errno == EINVAL)
1065 fatal("ControlSocket %s already exists",
1066 options.control_path);
1067 else
1068 fatal("%s bind(): %s\n", __func__, strerror(errno));
1069 }
1070 umask(old_umask);
1071
1072 if (listen(control_fd, 64) == -1)
1073 fatal("%s listen(): %s\n", __func__, strerror(errno));
1074
1075 set_nonblock(control_fd);
1076}
1077
Ben Lindstromf558cf62001-09-20 23:13:49 +00001078/* request pty/x11/agent/tcpfwd/shell for channel */
Ben Lindstrombba81212001-06-25 05:01:22 +00001079static void
Ben Lindstromf558cf62001-09-20 23:13:49 +00001080ssh_session2_setup(int id, void *arg)
Damien Miller1383bd82000-04-06 12:32:37 +10001081{
Damien Miller3756dce2004-06-18 01:17:29 +10001082 extern char **environ;
1083
Damien Miller0e220db2004-06-15 10:34:08 +10001084 int interactive = tty_flag;
1085 if (options.forward_x11 && getenv("DISPLAY") != NULL) {
Ben Lindstrom4a4bd712001-12-06 17:45:19 +00001086 char *proto, *data;
Damien Millerbd483e72000-04-30 10:00:53 +10001087 /* Get reasonable local authentication information. */
Ben Lindstrom4a4bd712001-12-06 17:45:19 +00001088 x11_get_proto(&proto, &data);
Damien Millerbd483e72000-04-30 10:00:53 +10001089 /* Request forwarding with authentication spoofing. */
1090 debug("Requesting X11 forwarding with authentication spoofing.");
1091 x11_request_forwarding_with_spoofing(id, proto, data);
Ben Lindstrombf555ba2001-01-18 02:04:35 +00001092 interactive = 1;
Damien Millerbd483e72000-04-30 10:00:53 +10001093 /* XXX wait for reply */
1094 }
1095
Damien Miller0bc1bd82000-11-13 22:57:25 +11001096 check_agent_present();
1097 if (options.forward_agent) {
1098 debug("Requesting authentication agent forwarding.");
1099 channel_request_start(id, "auth-agent-req@openssh.com", 0);
1100 packet_send();
1101 }
1102
Damien Miller0e220db2004-06-15 10:34:08 +10001103 client_session2_setup(id, tty_flag, subsystem_flag, getenv("TERM"),
Damien Miller3756dce2004-06-18 01:17:29 +10001104 NULL, fileno(stdin), &command, environ, &ssh_subsystem_reply);
Ben Lindstrom1e7d3062001-02-09 02:36:43 +00001105
Ben Lindstrombf555ba2001-01-18 02:04:35 +00001106 packet_set_interactive(interactive);
Damien Miller1383bd82000-04-06 12:32:37 +10001107}
1108
Ben Lindstromf558cf62001-09-20 23:13:49 +00001109/* open new channel for a session */
Ben Lindstrombba81212001-06-25 05:01:22 +00001110static int
Ben Lindstromf558cf62001-09-20 23:13:49 +00001111ssh_session2_open(void)
Damien Miller1383bd82000-04-06 12:32:37 +10001112{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001113 Channel *c;
1114 int window, packetmax, in, out, err;
Damien Millerad833b32000-08-23 10:46:23 +10001115
Damien Millercaf6dd62000-08-29 11:33:50 +11001116 if (stdin_null_flag) {
Ben Lindstrom31ca54a2001-02-09 02:11:24 +00001117 in = open(_PATH_DEVNULL, O_RDONLY);
Damien Millercaf6dd62000-08-29 11:33:50 +11001118 } else {
1119 in = dup(STDIN_FILENO);
1120 }
1121 out = dup(STDOUT_FILENO);
1122 err = dup(STDERR_FILENO);
1123
1124 if (in < 0 || out < 0 || err < 0)
1125 fatal("dup() in/out/err failed");
1126
Damien Miller69b69aa2000-10-28 14:19:58 +11001127 /* enable nonblocking unless tty */
1128 if (!isatty(in))
1129 set_nonblock(in);
1130 if (!isatty(out))
1131 set_nonblock(out);
1132 if (!isatty(err))
1133 set_nonblock(err);
1134
Damien Millere4340be2000-09-16 13:29:08 +11001135 window = CHAN_SES_WINDOW_DEFAULT;
1136 packetmax = CHAN_SES_PACKET_DEFAULT;
Damien Miller19a59452002-02-19 15:20:57 +11001137 if (tty_flag) {
1138 window >>= 1;
1139 packetmax >>= 1;
Damien Miller1383bd82000-04-06 12:32:37 +10001140 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001141 c = channel_new(
Damien Miller1383bd82000-04-06 12:32:37 +10001142 "session", SSH_CHANNEL_OPENING, in, out, err,
Damien Millere4340be2000-09-16 13:29:08 +11001143 window, packetmax, CHAN_EXTENDED_WRITE,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10001144 "client-session", /*nonblock*/0);
Damien Miller1383bd82000-04-06 12:32:37 +10001145
Ben Lindstromf558cf62001-09-20 23:13:49 +00001146 debug3("ssh_session2_open: channel_new: %d", c->self);
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001147
Ben Lindstrom5ec26452001-06-09 00:18:51 +00001148 channel_send_open(c->self);
Ben Lindstromf558cf62001-09-20 23:13:49 +00001149 if (!no_shell_flag)
Damien Miller0e220db2004-06-15 10:34:08 +10001150 channel_register_confirm(c->self, ssh_session2_setup, NULL);
Damien Miller1383bd82000-04-06 12:32:37 +10001151
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001152 return c->self;
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001153}
1154
Ben Lindstrombba81212001-06-25 05:01:22 +00001155static int
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001156ssh_session2(void)
1157{
Ben Lindstromf558cf62001-09-20 23:13:49 +00001158 int id = -1;
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001159
1160 /* XXX should be pre-session */
1161 ssh_init_forwarding();
Damien Miller0e220db2004-06-15 10:34:08 +10001162 ssh_control_listener();
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001163
Ben Lindstromf558cf62001-09-20 23:13:49 +00001164 if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN))
1165 id = ssh_session2_open();
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001166
1167 /* If requested, let ssh continue in the background. */
1168 if (fork_after_authentication_flag)
1169 if (daemon(1, 1) < 0)
1170 fatal("daemon() failed: %.200s", strerror(errno));
1171
Ben Lindstrom2b1f71b2001-06-05 20:32:21 +00001172 return client_loop(tty_flag, tty_flag ?
1173 options.escape_char : SSH_ESCAPECHAR_NONE, id);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001174}
Damien Miller0bc1bd82000-11-13 22:57:25 +11001175
Ben Lindstrombba81212001-06-25 05:01:22 +00001176static void
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001177load_public_identity_files(void)
1178{
1179 char *filename;
Ben Lindstrom711b04a2001-08-06 21:12:42 +00001180 int i = 0;
Ben Lindstrom0936a5b2002-03-26 03:17:42 +00001181 Key *public;
Ben Lindstrom711b04a2001-08-06 21:12:42 +00001182#ifdef SMARTCARD
Ben Lindstrom0936a5b2002-03-26 03:17:42 +00001183 Key **keys;
1184
Ben Lindstromf7db3bb2001-08-06 21:35:51 +00001185 if (options.smartcard_device != NULL &&
Ben Lindstrom0936a5b2002-03-26 03:17:42 +00001186 options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
1187 (keys = sc_get_keys(options.smartcard_device, NULL)) != NULL ) {
1188 int count = 0;
1189 for (i = 0; keys[i] != NULL; i++) {
1190 count++;
Ben Lindstrom0936a5b2002-03-26 03:17:42 +00001191 memmove(&options.identity_files[1], &options.identity_files[0],
1192 sizeof(char *) * (SSH_MAX_IDENTITY_FILES - 1));
1193 memmove(&options.identity_keys[1], &options.identity_keys[0],
1194 sizeof(Key *) * (SSH_MAX_IDENTITY_FILES - 1));
1195 options.num_identity_files++;
1196 options.identity_keys[0] = keys[i];
Damien Miller56a0bb02003-06-18 20:28:40 +10001197 options.identity_files[0] = sc_get_key_label(keys[i]);
Ben Lindstrom0936a5b2002-03-26 03:17:42 +00001198 }
Ben Lindstrom4f054602002-03-26 03:23:00 +00001199 if (options.num_identity_files > SSH_MAX_IDENTITY_FILES)
1200 options.num_identity_files = SSH_MAX_IDENTITY_FILES;
Ben Lindstrom0936a5b2002-03-26 03:17:42 +00001201 i = count;
1202 xfree(keys);
Ben Lindstrom711b04a2001-08-06 21:12:42 +00001203 }
Ben Lindstromffce1472001-08-06 21:57:31 +00001204#endif /* SMARTCARD */
Ben Lindstrom711b04a2001-08-06 21:12:42 +00001205 for (; i < options.num_identity_files; i++) {
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001206 filename = tilde_expand_filename(options.identity_files[i],
1207 original_real_uid);
Ben Lindstromd0fca422001-03-26 13:44:06 +00001208 public = key_load_public(filename, NULL);
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001209 debug("identity file %s type %d", filename,
1210 public ? public->type : -1);
1211 xfree(options.identity_files[i]);
1212 options.identity_files[i] = filename;
1213 options.identity_keys[i] = public;
1214 }
1215}
Damien Miller0e220db2004-06-15 10:34:08 +10001216
1217static void
1218control_client_sighandler(int signo)
1219{
1220 control_client_terminate = signo;
1221}
1222
1223static void
1224control_client_sigrelay(int signo)
1225{
1226 if (control_server_pid > 1)
1227 kill(control_server_pid, signo);
1228}
1229
Darren Tucker365433f2004-06-22 12:29:23 +10001230static int
1231env_permitted(char *env)
1232{
1233 int i;
1234 char name[1024], *cp;
1235
1236 strlcpy(name, env, sizeof(name));
1237 if ((cp = strchr(name, '=')) == NULL)
1238 return (0);
1239
1240 *cp = '\0';
1241
1242 for (i = 0; i < options.num_send_env; i++)
1243 if (match_pattern(name, options.send_env[i]))
1244 return (1);
1245
1246 return (0);
1247}
1248
Damien Miller0e220db2004-06-15 10:34:08 +10001249static void
1250control_client(const char *path)
1251{
1252 struct sockaddr_un addr;
Darren Tucker365433f2004-06-22 12:29:23 +10001253 int i, r, sock, exitval, num_env, addr_len;
Damien Miller0e220db2004-06-15 10:34:08 +10001254 Buffer m;
1255 char *cp;
Damien Miller3756dce2004-06-18 01:17:29 +10001256 extern char **environ;
Damien Miller0e220db2004-06-15 10:34:08 +10001257
1258 memset(&addr, '\0', sizeof(addr));
1259 addr.sun_family = AF_UNIX;
Damien Miller07b6ff12004-06-15 11:14:45 +10001260 addr_len = offsetof(struct sockaddr_un, sun_path) +
Damien Miller0e220db2004-06-15 10:34:08 +10001261 strlen(path) + 1;
1262
1263 if (strlcpy(addr.sun_path, path,
1264 sizeof(addr.sun_path)) >= sizeof(addr.sun_path))
1265 fatal("ControlPath too long");
1266
1267 if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) < 0)
1268 fatal("%s socket(): %s", __func__, strerror(errno));
1269
Damien Miller07b6ff12004-06-15 11:14:45 +10001270 if (connect(sock, (struct sockaddr*)&addr, addr_len) == -1)
Damien Miller0e220db2004-06-15 10:34:08 +10001271 fatal("Couldn't connect to %s: %s", path, strerror(errno));
1272
1273 if ((cp = getenv("TERM")) == NULL)
1274 cp = "";
1275
Damien Miller0e220db2004-06-15 10:34:08 +10001276 buffer_init(&m);
1277
1278 /* Get PID of controlee */
1279 if (ssh_msg_recv(sock, &m) == -1)
1280 fatal("%s: msg_recv", __func__);
1281 if (buffer_get_char(&m) != 0)
1282 fatal("%s: wrong version", __func__);
Damien Miller23f07702004-06-18 01:19:03 +10001283 /* Connection allowed? */
1284 if (buffer_get_int(&m) != 1)
1285 fatal("Connection to master denied");
Damien Miller0e220db2004-06-15 10:34:08 +10001286 control_server_pid = buffer_get_int(&m);
1287
Damien Miller0e220db2004-06-15 10:34:08 +10001288 buffer_clear(&m);
1289 buffer_put_int(&m, tty_flag);
1290 buffer_put_int(&m, subsystem_flag);
1291 buffer_put_cstring(&m, cp);
1292
1293 buffer_append(&command, "\0", 1);
1294 buffer_put_cstring(&m, buffer_ptr(&command));
1295
Darren Tucker365433f2004-06-22 12:29:23 +10001296 if (options.num_send_env == 0 || environ == NULL) {
1297 buffer_put_int(&m, 0);
1298 } else {
1299 /* Pass environment */
1300 num_env = 0;
1301 for (i = 0; environ[i] != NULL; i++)
1302 if (env_permitted(environ[i]))
1303 num_env++; /* Count */
1304
1305 buffer_put_int(&m, num_env);
1306
1307 for (i = 0; environ[i] != NULL && num_env >= 0; i++, num_env--)
1308 if (env_permitted(environ[i]))
1309 buffer_put_cstring(&m, environ[i]);
1310 }
Damien Miller3756dce2004-06-18 01:17:29 +10001311
Damien Miller0e220db2004-06-15 10:34:08 +10001312 if (ssh_msg_send(sock, /* version */0, &m) == -1)
1313 fatal("%s: msg_send", __func__);
1314
1315 mm_send_fd(sock, STDIN_FILENO);
1316 mm_send_fd(sock, STDOUT_FILENO);
1317 mm_send_fd(sock, STDERR_FILENO);
1318
1319 /* Wait for reply, so master has a chance to gather ttymodes */
1320 buffer_clear(&m);
1321 if (ssh_msg_recv(sock, &m) == -1)
1322 fatal("%s: msg_recv", __func__);
1323 if (buffer_get_char(&m) != 0)
1324 fatal("%s: master returned error", __func__);
1325 buffer_free(&m);
1326
Damien Miller0809e232004-06-18 22:20:57 +10001327 signal(SIGINT, control_client_sighandler);
1328 signal(SIGTERM, control_client_sighandler);
1329 signal(SIGWINCH, control_client_sigrelay);
1330
Damien Miller0e220db2004-06-15 10:34:08 +10001331 if (tty_flag)
1332 enter_raw_mode();
1333
1334 /* Stick around until the controlee closes the client_fd */
1335 exitval = 0;
1336 for (;!control_client_terminate;) {
1337 r = read(sock, &exitval, sizeof(exitval));
1338 if (r == 0) {
1339 debug2("Received EOF from master");
1340 break;
1341 }
1342 if (r > 0)
1343 debug2("Received exit status from master %d", exitval);
1344 if (r == -1 && errno != EINTR)
1345 fatal("%s: read %s", __func__, strerror(errno));
1346 }
1347
1348 if (control_client_terminate)
1349 debug2("Exiting on signal %d", control_client_terminate);
1350
1351 close(sock);
1352
1353 leave_raw_mode();
1354
1355 if (tty_flag && options.log_level != SYSLOG_LEVEL_QUIET)
1356 fprintf(stderr, "Connection to master closed.\r\n");
1357
1358 exit(exitval);
1359}