blob: 8a7aea09f9cec85d5163e9baab817df5fb411431 [file] [log] [blame]
Darren Tucker19104782013-04-05 11:13:08 +11001/* $OpenBSD: ssh.c,v 1.371 2013/02/17 23:16:57 dtucker Exp $ */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002/*
Damien Miller95def091999-11-25 00:26:21 +11003 * Author: Tatu Ylonen <ylo@cs.hut.fi>
4 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5 * All rights reserved
Damien Miller95def091999-11-25 00:26:21 +11006 * Ssh client program. This program can be used to log into a remote machine.
7 * The software supports strong authentication, encryption, and forwarding
8 * of X11, TCP/IP, and authentication connections.
9 *
Damien Millere4340be2000-09-16 13:29:08 +110010 * As far as I am concerned, the code I have written for this software
11 * can be used freely for any purpose. Any derived versions of this
12 * software must be clearly marked as such, and if the derived work is
13 * incompatible with the protocol description in the RFC file, it must be
14 * called by a name other than "ssh" or "Secure Shell".
15 *
16 * Copyright (c) 1999 Niels Provos. All rights reserved.
Darren Tucker0a118da2003-10-15 15:54:32 +100017 * Copyright (c) 2000, 2001, 2002, 2003 Markus Friedl. All rights reserved.
Damien Millere4340be2000-09-16 13:29:08 +110018 *
19 * Modified to work with SSL by Niels Provos <provos@citi.umich.edu>
20 * in Canada (German citizen).
21 *
22 * Redistribution and use in source and binary forms, with or without
23 * modification, are permitted provided that the following conditions
24 * are met:
25 * 1. Redistributions of source code must retain the above copyright
26 * notice, this list of conditions and the following disclaimer.
27 * 2. Redistributions in binary form must reproduce the above copyright
28 * notice, this list of conditions and the following disclaimer in the
29 * documentation and/or other materials provided with the distribution.
30 *
31 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
32 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
33 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
34 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
35 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
36 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
37 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
38 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
39 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
40 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Damien Miller95def091999-11-25 00:26:21 +110041 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100042
43#include "includes.h"
Damien Millercd4223c2006-03-15 11:22:47 +110044
Damien Millerf17883e2006-03-15 11:45:54 +110045#include <sys/types.h>
46#ifdef HAVE_SYS_STAT_H
47# include <sys/stat.h>
48#endif
Damien Millercd4223c2006-03-15 11:22:47 +110049#include <sys/resource.h>
Damien Miller17e91c02006-03-15 11:28:34 +110050#include <sys/ioctl.h>
Darren Tucker199b1342009-07-06 07:16:56 +100051#include <sys/param.h>
Damien Millere3b60b52006-07-10 21:08:03 +100052#include <sys/socket.h>
Damien Miller857b02e2010-09-24 22:02:56 +100053#include <sys/wait.h>
Damien Miller03e20032006-03-15 11:16:59 +110054
Damien Millerc7b06362006-03-15 11:53:45 +110055#include <ctype.h>
Darren Tuckerba724052006-07-12 22:24:22 +100056#include <errno.h>
Damien Miller57cf6382006-07-10 21:13:46 +100057#include <fcntl.h>
Damien Millerb8fe89c2006-07-24 14:51:00 +100058#include <netdb.h>
Damien Miller6645e7a2006-03-15 14:42:54 +110059#ifdef HAVE_PATHS_H
Damien Miller03e20032006-03-15 11:16:59 +110060#include <paths.h>
Damien Miller6645e7a2006-03-15 14:42:54 +110061#endif
Damien Miller9f2abc42006-07-10 20:53:08 +100062#include <pwd.h>
Damien Miller6ff3cad2006-03-15 11:52:09 +110063#include <signal.h>
Damien Millerded319c2006-09-01 15:38:36 +100064#include <stdarg.h>
Damien Miller2d00e632006-07-24 13:53:19 +100065#include <stddef.h>
Damien Millera7a73ee2006-08-05 11:37:59 +100066#include <stdio.h>
Damien Millere7a1e5c2006-08-05 11:34:19 +100067#include <stdlib.h>
Damien Millere3476ed2006-07-24 14:13:33 +100068#include <string.h>
Damien Millere6b3b612006-07-24 14:01:23 +100069#include <unistd.h>
Damien Millereba71ba2000-04-29 23:57:08 +100070
Darren Tucker46aa3e02006-09-02 15:32:40 +100071#include <netinet/in.h>
72#include <arpa/inet.h>
73
Damien Millereba71ba2000-04-29 23:57:08 +100074#include <openssl/evp.h>
Damien Miller0bc1bd82000-11-13 22:57:25 +110075#include <openssl/err.h>
Darren Tuckerbfaaf962008-02-28 19:13:52 +110076#include "openbsd-compat/openssl-compat.h"
Damien Millerb84886b2008-05-19 15:05:07 +100077#include "openbsd-compat/sys-queue.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100078
Damien Millerd7834352006-08-05 12:39:39 +100079#include "xmalloc.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100080#include "ssh.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000081#include "ssh1.h"
Damien Miller1383bd82000-04-06 12:32:37 +100082#include "ssh2.h"
Damien Millerb96c4412010-07-02 13:34:24 +100083#include "canohost.h"
Damien Miller1383bd82000-04-06 12:32:37 +100084#include "compat.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000085#include "cipher.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000086#include "packet.h"
87#include "buffer.h"
Ben Lindstromc7637672001-06-09 00:36:26 +000088#include "channels.h"
Damien Millereba71ba2000-04-29 23:57:08 +100089#include "key.h"
Damien Miller994cf142000-07-21 10:19:44 +100090#include "authfd.h"
Damien Millereba71ba2000-04-29 23:57:08 +100091#include "authfile.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000092#include "pathnames.h"
Damien Miller0e220db2004-06-15 10:34:08 +100093#include "dispatch.h"
Ben Lindstrombf555ba2001-01-18 02:04:35 +000094#include "clientloop.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000095#include "log.h"
96#include "readconf.h"
97#include "sshconnect.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000098#include "misc.h"
Ben Lindstrom06b33aa2001-02-15 03:01:59 +000099#include "kex.h"
100#include "mac.h"
Darren Tucker06f2bd82004-05-13 16:06:46 +1000101#include "sshpty.h"
Darren Tucker46bc0752004-05-02 22:11:30 +1000102#include "match.h"
Damien Miller0e220db2004-06-15 10:34:08 +1000103#include "msg.h"
Darren Tucker25f60a72004-08-15 17:23:34 +1000104#include "uidswap.h"
Darren Tuckerf1de4e52010-01-08 16:54:59 +1100105#include "roaming.h"
Damien Millerb7576772006-07-10 20:23:39 +1000106#include "version.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000107
Damien Miller7ea845e2010-02-12 09:21:02 +1100108#ifdef ENABLE_PKCS11
109#include "ssh-pkcs11.h"
Ben Lindstrombcc18082001-08-06 21:59:25 +0000110#endif
Ben Lindstromc5b68002001-07-04 04:52:03 +0000111
Damien Miller3f905871999-11-15 17:10:57 +1100112extern char *__progname;
Damien Miller3f905871999-11-15 17:10:57 +1100113
Damien Millerea2c1a42011-06-03 12:10:22 +1000114/* Saves a copy of argv for setproctitle emulation */
115#ifndef HAVE_SETPROCTITLE
116static char **saved_av;
117#endif
118
Darren Tuckerd6173c02008-06-13 04:52:53 +1000119/* Flag indicating whether debug mode is on. May be set on the command line. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000120int debug_flag = 0;
121
Damien Miller21771e22011-05-15 08:45:50 +1000122/* Flag indicating whether a tty should be requested */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000123int tty_flag = 0;
124
Damien Miller1383bd82000-04-06 12:32:37 +1000125/* don't exec a shell */
126int no_shell_flag = 0;
Damien Miller1383bd82000-04-06 12:32:37 +1000127
Damien Miller5428f641999-11-25 11:54:57 +1100128/*
129 * Flag indicating that nothing should be read from stdin. This can be set
130 * on the command line.
131 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000132int stdin_null_flag = 0;
133
Damien Miller5428f641999-11-25 11:54:57 +1100134/*
Damien Millere11e1ea2010-08-03 16:04:46 +1000135 * Flag indicating that the current process should be backgrounded and
136 * a new slave launched in the foreground for ControlPersist.
137 */
138int need_controlpersist_detach = 0;
139
140/* Copies of flags for ControlPersist foreground slave */
Damien Miller21771e22011-05-15 08:45:50 +1000141int ostdin_null_flag, ono_shell_flag, otty_flag, orequest_tty;
Damien Millere11e1ea2010-08-03 16:04:46 +1000142
143/*
Damien Miller5428f641999-11-25 11:54:57 +1100144 * Flag indicating that ssh should fork after authentication. This is useful
Ben Lindstromf666fec2002-06-06 19:51:58 +0000145 * so that the passphrase can be entered manually, and then ssh goes to the
Damien Miller5428f641999-11-25 11:54:57 +1100146 * background.
147 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000148int fork_after_authentication_flag = 0;
149
Darren Tucker7ad8dd22010-01-12 19:40:27 +1100150/* forward stdio to remote host and port */
151char *stdio_forward_host = NULL;
152int stdio_forward_port = 0;
153
Damien Miller5428f641999-11-25 11:54:57 +1100154/*
155 * General data structure for command line options and options configurable
156 * in configuration files. See readconf.h.
157 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000158Options options;
159
Ben Lindstrom14f31ab2001-09-12 17:48:04 +0000160/* optional user configfile */
161char *config = NULL;
162
Damien Miller5428f641999-11-25 11:54:57 +1100163/*
164 * Name of the host we are connecting to. This is the name given on the
165 * command line, or the HostName specified for the user-supplied name in a
166 * configuration file.
167 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000168char *host;
169
170/* socket address the host resolves to */
Damien Miller34132e52000-01-14 15:45:46 +1100171struct sockaddr_storage hostaddr;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000172
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000173/* Private host keys. */
Ben Lindstrom1bad2562002-06-06 19:57:33 +0000174Sensitive sensitive_data;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000175
176/* Original real UID. */
177uid_t original_real_uid;
Ben Lindstromf9c48842002-06-11 16:37:51 +0000178uid_t original_effective_uid;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000179
Damien Miller1383bd82000-04-06 12:32:37 +1000180/* command to be executed */
181Buffer command;
182
Damien Miller832562e2001-01-30 09:30:01 +1100183/* Should we execute a command or invoke a subsystem? */
184int subsystem_flag = 0;
185
Damien Miller2797f7f2002-04-23 21:09:44 +1000186/* # of replies received for global requests */
Darren Tucker9f407c42008-06-13 04:50:27 +1000187static int remote_forward_confirms_received = 0;
Damien Miller2797f7f2002-04-23 21:09:44 +1000188
Damien Millerb1cbfa22008-05-19 16:00:08 +1000189/* mux.c */
190extern int muxserver_sock;
191extern u_int muxclient_command;
Damien Miller0e220db2004-06-15 10:34:08 +1000192
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000193/* Prints a help message to the user. This function never returns. */
194
Ben Lindstrombba81212001-06-25 05:01:22 +0000195static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000196usage(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000197{
Damien Miller50955102004-03-22 09:34:58 +1100198 fprintf(stderr,
Damien Millerc13c3ee2008-11-03 19:23:28 +1100199"usage: ssh [-1246AaCfgKkMNnqsTtVvXxYy] [-b bind_address] [-c cipher_spec]\n"
Darren Tucker895d6982005-10-03 18:18:05 +1000200" [-D [bind_address:]port] [-e escape_char] [-F configfile]\n"
Damien Miller048dc932010-02-12 09:22:04 +1100201" [-I pkcs11] [-i identity_file]\n"
202" [-L [bind_address:]port:host:hostport]\n"
Damien Millerf91ee4c2005-03-01 21:24:33 +1100203" [-l login_name] [-m mac_spec] [-O ctl_cmd] [-o option] [-p port]\n"
Damien Miller02faece2005-03-02 12:04:32 +1100204" [-R [bind_address:]port:host:hostport] [-S ctl_path]\n"
Darren Tucker7ad8dd22010-01-12 19:40:27 +1100205" [-W host:port] [-w local_tun[:remote_tun]]\n"
206" [user@]hostname [command]\n"
Damien Miller50955102004-03-22 09:34:58 +1100207 );
Darren Tuckere9a9b712005-12-20 16:15:51 +1100208 exit(255);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000209}
210
Ben Lindstrombba81212001-06-25 05:01:22 +0000211static int ssh_session(void);
212static int ssh_session2(void);
213static void load_public_identity_files(void);
Damien Miller857b02e2010-09-24 22:02:56 +1000214static void main_sigchld_handler(int);
Damien Millerb1cbfa22008-05-19 16:00:08 +1000215
216/* from muxclient.c */
217void muxclient(const char *);
218void muxserver_listen(void);
Damien Miller1383bd82000-04-06 12:32:37 +1000219
Damien Miller295ee632011-05-29 21:42:31 +1000220/* ~/ expand a list of paths. NB. assumes path[n] is heap-allocated. */
221static void
222tilde_expand_paths(char **paths, u_int num_paths)
223{
224 u_int i;
225 char *cp;
226
227 for (i = 0; i < num_paths; i++) {
228 cp = tilde_expand_filename(paths[i], original_real_uid);
229 xfree(paths[i]);
230 paths[i] = cp;
231 }
232}
233
Damien Miller95def091999-11-25 00:26:21 +1100234/*
235 * Main program for the ssh client.
236 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000237int
238main(int ac, char **av)
239{
Darren Tucker199b1342009-07-06 07:16:56 +1000240 int i, r, opt, exit_status, use_syslog;
Damien Miller83f8a402011-01-07 09:51:17 +1100241 char *p, *cp, *line, *argv0, buf[MAXPATHLEN], *host_arg;
Damien Millerdfc85fa2011-05-15 08:44:02 +1000242 char thishost[NI_MAXHOST], shorthost[NI_MAXHOST], portstr[NI_MAXSERV];
Damien Miller95def091999-11-25 00:26:21 +1100243 struct stat st;
Ben Lindstrom086cf212001-03-05 05:56:40 +0000244 struct passwd *pw;
Damien Miller67bd0622007-09-17 12:06:57 +1000245 int dummy, timeout_ms;
Ben Lindstrom5ccf63a2001-09-24 20:00:10 +0000246 extern int optind, optreset;
Damien Miller4f8e6692001-07-14 13:22:53 +1000247 extern char *optarg;
Damien Millerea2c1a42011-06-03 12:10:22 +1000248
Damien Miller9651fe62005-06-26 08:55:25 +1000249 struct servent *sp;
Damien Millerf91ee4c2005-03-01 21:24:33 +1100250 Forward fwd;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000251
Darren Tuckerce321d82005-10-03 18:11:24 +1000252 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
253 sanitise_stdfd();
254
Damien Miller59d3d5b2003-08-22 09:34:41 +1000255 __progname = ssh_get_progname(av[0]);
Damien Millerf9b625c2000-07-09 22:42:32 +1000256
Damien Millerea2c1a42011-06-03 12:10:22 +1000257#ifndef HAVE_SETPROCTITLE
258 /* Prepare for later setproctitle emulation */
259 /* Save argv so it isn't clobbered by setproctitle() emulation */
260 saved_av = xcalloc(ac + 1, sizeof(*saved_av));
261 for (i = 0; i < ac; i++)
262 saved_av[i] = xstrdup(av[i]);
263 saved_av[i] = NULL;
264 compat_init_setproctitle(ac, av);
265 av = saved_av;
266#endif
267
Damien Miller5428f641999-11-25 11:54:57 +1100268 /*
Damien Miller00d9ae22010-08-17 01:59:31 +1000269 * Discard other fds that are hanging around. These can cause problem
270 * with backgrounded ssh processes started by ControlPersist.
271 */
272 closefrom(STDERR_FILENO + 1);
273
274 /*
Damien Miller5428f641999-11-25 11:54:57 +1100275 * Save the original real uid. It will be needed later (uid-swapping
276 * may clobber the real uid).
277 */
Damien Miller95def091999-11-25 00:26:21 +1100278 original_real_uid = getuid();
279 original_effective_uid = geteuid();
Damien Millera8e06ce2003-11-21 23:48:55 +1100280
Damien Miller50b9a602002-09-04 16:50:06 +1000281 /*
282 * Use uid-swapping to give up root privileges for the duration of
283 * option processing. We will re-instantiate the rights when we are
284 * ready to create the privileged port, and will permanently drop
285 * them when the port has been created (actually, when the connection
286 * has been made, as we may need to create the port several times).
287 */
288 PRIV_END;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000289
Damien Miller05dd7952000-10-01 00:42:48 +1100290#ifdef HAVE_SETRLIMIT
Damien Miller95def091999-11-25 00:26:21 +1100291 /* If we are installed setuid root be careful to not drop core. */
292 if (original_real_uid != original_effective_uid) {
293 struct rlimit rlim;
294 rlim.rlim_cur = rlim.rlim_max = 0;
295 if (setrlimit(RLIMIT_CORE, &rlim) < 0)
296 fatal("setrlimit failed: %.100s", strerror(errno));
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000297 }
Damien Millerbac2d8a2000-09-05 16:13:06 +1100298#endif
Ben Lindstrom3fcf1a22001-04-08 18:26:59 +0000299 /* Get user data. */
300 pw = getpwuid(original_real_uid);
301 if (!pw) {
Damien Miller996acd22003-04-09 20:59:48 +1000302 logit("You don't exist, go away!");
Darren Tuckere9a9b712005-12-20 16:15:51 +1100303 exit(255);
Ben Lindstrom3fcf1a22001-04-08 18:26:59 +0000304 }
305 /* Take a copy of the returned structure. */
306 pw = pwcopy(pw);
307
Damien Miller5428f641999-11-25 11:54:57 +1100308 /*
Damien Miller5428f641999-11-25 11:54:57 +1100309 * Set our umask to something reasonable, as some files are created
310 * with the default umask. This will make them world-readable but
311 * writable only by the owner, which is ok for all files for which we
312 * don't set the modes explicitly.
313 */
Damien Miller95def091999-11-25 00:26:21 +1100314 umask(022);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000315
Darren Tuckerd6173c02008-06-13 04:52:53 +1000316 /*
317 * Initialize option structure to indicate that no values have been
318 * set.
319 */
Damien Miller95def091999-11-25 00:26:21 +1100320 initialize_options(&options);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000321
Damien Miller95def091999-11-25 00:26:21 +1100322 /* Parse command-line arguments. */
323 host = NULL;
Damien Millere272a5b2008-11-03 19:22:37 +1100324 use_syslog = 0;
Darren Tucker72efd742009-06-21 17:48:00 +1000325 argv0 = av[0];
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000326
Damien Miller2ecb6bd2006-03-15 12:03:53 +1100327 again:
Darren Tuckerd6173c02008-06-13 04:52:53 +1000328 while ((opt = getopt(ac, av, "1246ab:c:e:fgi:kl:m:no:p:qstvx"
Darren Tucker7ad8dd22010-01-12 19:40:27 +1100329 "ACD:F:I:KL:MNO:PR:S:TVw:W:XYy")) != -1) {
Damien Miller95def091999-11-25 00:26:21 +1100330 switch (opt) {
Ben Lindstrom1e7d3062001-02-09 02:36:43 +0000331 case '1':
332 options.protocol = SSH_PROTO_1;
333 break;
Damien Miller4af51302000-04-16 11:18:38 +1000334 case '2':
335 options.protocol = SSH_PROTO_2;
336 break;
Damien Miller34132e52000-01-14 15:45:46 +1100337 case '4':
Darren Tucker0a4f04b2003-07-03 20:37:47 +1000338 options.address_family = AF_INET;
Damien Miller34132e52000-01-14 15:45:46 +1100339 break;
Damien Miller34132e52000-01-14 15:45:46 +1100340 case '6':
Darren Tucker0a4f04b2003-07-03 20:37:47 +1000341 options.address_family = AF_INET6;
Damien Miller34132e52000-01-14 15:45:46 +1100342 break;
Damien Miller95def091999-11-25 00:26:21 +1100343 case 'n':
344 stdin_null_flag = 1;
345 break;
Damien Miller95def091999-11-25 00:26:21 +1100346 case 'f':
347 fork_after_authentication_flag = 1;
348 stdin_null_flag = 1;
349 break;
Damien Miller95def091999-11-25 00:26:21 +1100350 case 'x':
351 options.forward_x11 = 0;
352 break;
Damien Miller95def091999-11-25 00:26:21 +1100353 case 'X':
354 options.forward_x11 = 1;
355 break;
Damien Millere272a5b2008-11-03 19:22:37 +1100356 case 'y':
357 use_syslog = 1;
358 break;
Darren Tucker0a118da2003-10-15 15:54:32 +1000359 case 'Y':
360 options.forward_x11 = 1;
361 options.forward_x11_trusted = 1;
362 break;
Damien Miller95def091999-11-25 00:26:21 +1100363 case 'g':
364 options.gateway_ports = 1;
365 break;
Darren Tucker7ebfc102004-11-07 20:06:19 +1100366 case 'O':
Damien Millere1537f92010-01-26 13:26:22 +1100367 if (stdio_forward_host != NULL)
368 fatal("Cannot specify multiplexing "
369 "command with -W");
370 else if (muxclient_command != 0)
371 fatal("Multiplexing command already specified");
Darren Tucker7ebfc102004-11-07 20:06:19 +1100372 if (strcmp(optarg, "check") == 0)
Damien Millerb1cbfa22008-05-19 16:00:08 +1000373 muxclient_command = SSHMUX_COMMAND_ALIVE_CHECK;
Damien Miller388f6fc2010-05-21 14:57:35 +1000374 else if (strcmp(optarg, "forward") == 0)
375 muxclient_command = SSHMUX_COMMAND_FORWARD;
Darren Tucker7ebfc102004-11-07 20:06:19 +1100376 else if (strcmp(optarg, "exit") == 0)
Damien Millerb1cbfa22008-05-19 16:00:08 +1000377 muxclient_command = SSHMUX_COMMAND_TERMINATE;
Damien Miller6c3eec72011-05-05 14:16:22 +1000378 else if (strcmp(optarg, "stop") == 0)
379 muxclient_command = SSHMUX_COMMAND_STOP;
Damien Millerf6dff7c2011-09-22 21:38:52 +1000380 else if (strcmp(optarg, "cancel") == 0)
381 muxclient_command = SSHMUX_COMMAND_CANCEL_FWD;
Darren Tucker7ebfc102004-11-07 20:06:19 +1100382 else
383 fatal("Invalid multiplex command.");
384 break;
Damien Miller147bba32002-09-04 16:46:06 +1000385 case 'P': /* deprecated */
Damien Miller95def091999-11-25 00:26:21 +1100386 options.use_privileged_port = 0;
387 break;
Damien Miller95def091999-11-25 00:26:21 +1100388 case 'a':
389 options.forward_agent = 0;
390 break;
Damien Millerb1715dc2000-05-30 13:44:51 +1000391 case 'A':
392 options.forward_agent = 1;
393 break;
Damien Miller95def091999-11-25 00:26:21 +1100394 case 'k':
Damien Millere0113cc2003-11-24 13:10:09 +1100395 options.gss_deleg_creds = 0;
Damien Miller95def091999-11-25 00:26:21 +1100396 break;
Darren Tucker415bddc2007-06-12 23:43:16 +1000397 case 'K':
398 options.gss_authentication = 1;
399 options.gss_deleg_creds = 1;
400 break;
Damien Miller95def091999-11-25 00:26:21 +1100401 case 'i':
402 if (stat(optarg, &st) < 0) {
Damien Millerf4614452001-07-14 12:18:10 +1000403 fprintf(stderr, "Warning: Identity file %s "
Damien Miller3eb48b62005-03-01 21:15:46 +1100404 "not accessible: %s.\n", optarg,
405 strerror(errno));
Damien Miller95def091999-11-25 00:26:21 +1100406 break;
407 }
Darren Tucker19104782013-04-05 11:13:08 +1100408 add_identity_file(&options, NULL, optarg, 1);
Damien Miller95def091999-11-25 00:26:21 +1100409 break;
Ben Lindstromc5b68002001-07-04 04:52:03 +0000410 case 'I':
Damien Miller7ea845e2010-02-12 09:21:02 +1100411#ifdef ENABLE_PKCS11
412 options.pkcs11_provider = xstrdup(optarg);
Ben Lindstrombcc18082001-08-06 21:59:25 +0000413#else
Damien Miller7ea845e2010-02-12 09:21:02 +1100414 fprintf(stderr, "no support for PKCS#11.\n");
Ben Lindstrombcc18082001-08-06 21:59:25 +0000415#endif
Ben Lindstromc5b68002001-07-04 04:52:03 +0000416 break;
Damien Miller95def091999-11-25 00:26:21 +1100417 case 't':
Damien Miller21771e22011-05-15 08:45:50 +1000418 if (options.request_tty == REQUEST_TTY_YES)
419 options.request_tty = REQUEST_TTY_FORCE;
420 else
421 options.request_tty = REQUEST_TTY_YES;
Damien Miller95def091999-11-25 00:26:21 +1100422 break;
Damien Miller95def091999-11-25 00:26:21 +1100423 case 'v':
Darren Tuckere98dfa32003-07-19 19:54:31 +1000424 if (debug_flag == 0) {
Damien Millere4340be2000-09-16 13:29:08 +1100425 debug_flag = 1;
426 options.log_level = SYSLOG_LEVEL_DEBUG1;
Darren Tuckere98dfa32003-07-19 19:54:31 +1000427 } else {
428 if (options.log_level < SYSLOG_LEVEL_DEBUG3)
429 options.log_level++;
Damien Millere4340be2000-09-16 13:29:08 +1100430 break;
Darren Tuckere98dfa32003-07-19 19:54:31 +1000431 }
Darren Tuckere9bf9842004-11-05 20:05:32 +1100432 /* FALLTHROUGH */
Damien Miller95def091999-11-25 00:26:21 +1100433 case 'V':
Damien Miller0c889cd2004-03-22 09:36:00 +1100434 fprintf(stderr, "%s, %s\n",
Damien Miller2aa6d3c2004-09-12 16:53:04 +1000435 SSH_RELEASE, SSLeay_version(SSLEAY_VERSION));
Damien Miller95def091999-11-25 00:26:21 +1100436 if (opt == 'V')
437 exit(0);
Damien Miller95def091999-11-25 00:26:21 +1100438 break;
Damien Millerd27b9472005-12-13 19:29:02 +1100439 case 'w':
Damien Miller7b58e802005-12-13 19:33:19 +1100440 if (options.tun_open == -1)
441 options.tun_open = SSH_TUNMODE_DEFAULT;
Damien Millerd27b9472005-12-13 19:29:02 +1100442 options.tun_local = a2tun(optarg, &options.tun_remote);
Damien Miller7b58e802005-12-13 19:33:19 +1100443 if (options.tun_local == SSH_TUNID_ERR) {
Darren Tuckerd6173c02008-06-13 04:52:53 +1000444 fprintf(stderr,
445 "Bad tun device '%s'\n", optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100446 exit(255);
Damien Millerd27b9472005-12-13 19:29:02 +1100447 }
448 break;
Darren Tucker7ad8dd22010-01-12 19:40:27 +1100449 case 'W':
Damien Millere1537f92010-01-26 13:26:22 +1100450 if (stdio_forward_host != NULL)
451 fatal("stdio forward already specified");
452 if (muxclient_command != 0)
453 fatal("Cannot specify stdio forward with -O");
Darren Tucker7ad8dd22010-01-12 19:40:27 +1100454 if (parse_forward(&fwd, optarg, 1, 0)) {
455 stdio_forward_host = fwd.listen_host;
456 stdio_forward_port = fwd.listen_port;
457 xfree(fwd.connect_host);
458 } else {
459 fprintf(stderr,
460 "Bad stdio forwarding specification '%s'\n",
461 optarg);
462 exit(255);
463 }
Damien Miller21771e22011-05-15 08:45:50 +1000464 options.request_tty = REQUEST_TTY_NO;
Darren Tucker7ad8dd22010-01-12 19:40:27 +1100465 no_shell_flag = 1;
466 options.clear_forwardings = 1;
467 options.exit_on_forward_failure = 1;
468 break;
Damien Miller95def091999-11-25 00:26:21 +1100469 case 'q':
470 options.log_level = SYSLOG_LEVEL_QUIET;
471 break;
Damien Miller95def091999-11-25 00:26:21 +1100472 case 'e':
473 if (optarg[0] == '^' && optarg[2] == 0 &&
Damien Millerf4614452001-07-14 12:18:10 +1000474 (u_char) optarg[1] >= 64 &&
475 (u_char) optarg[1] < 128)
Ben Lindstrom46c16222000-12-22 01:43:59 +0000476 options.escape_char = (u_char) optarg[1] & 31;
Damien Miller95def091999-11-25 00:26:21 +1100477 else if (strlen(optarg) == 1)
Ben Lindstrom46c16222000-12-22 01:43:59 +0000478 options.escape_char = (u_char) optarg[0];
Damien Miller95def091999-11-25 00:26:21 +1100479 else if (strcmp(optarg, "none") == 0)
Ben Lindstrom2b1f71b2001-06-05 20:32:21 +0000480 options.escape_char = SSH_ESCAPECHAR_NONE;
Damien Miller95def091999-11-25 00:26:21 +1100481 else {
Damien Millerf4614452001-07-14 12:18:10 +1000482 fprintf(stderr, "Bad escape character '%s'.\n",
483 optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100484 exit(255);
Damien Miller95def091999-11-25 00:26:21 +1100485 }
486 break;
Damien Miller95def091999-11-25 00:26:21 +1100487 case 'c':
Damien Millereba71ba2000-04-29 23:57:08 +1000488 if (ciphers_valid(optarg)) {
489 /* SSH2 only */
490 options.ciphers = xstrdup(optarg);
Darren Tucker5cb30ad2004-08-12 22:40:24 +1000491 options.cipher = SSH_CIPHER_INVALID;
Damien Millereba71ba2000-04-29 23:57:08 +1000492 } else {
493 /* SSH1 only */
Damien Millere39cacc2000-11-29 12:18:44 +1100494 options.cipher = cipher_number(optarg);
495 if (options.cipher == -1) {
Damien Millerf4614452001-07-14 12:18:10 +1000496 fprintf(stderr,
497 "Unknown cipher type '%s'\n",
498 optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100499 exit(255);
Damien Millereba71ba2000-04-29 23:57:08 +1000500 }
Damien Millerf4614452001-07-14 12:18:10 +1000501 if (options.cipher == SSH_CIPHER_3DES)
Damien Millere39cacc2000-11-29 12:18:44 +1100502 options.ciphers = "3des-cbc";
Damien Millerf4614452001-07-14 12:18:10 +1000503 else if (options.cipher == SSH_CIPHER_BLOWFISH)
Damien Millere39cacc2000-11-29 12:18:44 +1100504 options.ciphers = "blowfish-cbc";
Damien Millerf4614452001-07-14 12:18:10 +1000505 else
Damien Millere39cacc2000-11-29 12:18:44 +1100506 options.ciphers = (char *)-1;
Damien Miller95def091999-11-25 00:26:21 +1100507 }
508 break;
Ben Lindstrom06b33aa2001-02-15 03:01:59 +0000509 case 'm':
510 if (mac_valid(optarg))
511 options.macs = xstrdup(optarg);
512 else {
Damien Millerf4614452001-07-14 12:18:10 +1000513 fprintf(stderr, "Unknown mac type '%s'\n",
514 optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100515 exit(255);
Ben Lindstrom06b33aa2001-02-15 03:01:59 +0000516 }
517 break;
Damien Miller0e220db2004-06-15 10:34:08 +1000518 case 'M':
Damien Millerd14b1e72005-06-16 13:19:41 +1000519 if (options.control_master == SSHCTL_MASTER_YES)
520 options.control_master = SSHCTL_MASTER_ASK;
521 else
522 options.control_master = SSHCTL_MASTER_YES;
Damien Miller0e220db2004-06-15 10:34:08 +1000523 break;
Damien Miller95def091999-11-25 00:26:21 +1100524 case 'p':
Ben Lindstrom19066a12001-04-12 23:39:26 +0000525 options.port = a2port(optarg);
Damien Miller3dc71ad2009-01-28 16:31:22 +1100526 if (options.port <= 0) {
Ben Lindstrom146edb92001-04-11 23:06:28 +0000527 fprintf(stderr, "Bad port '%s'\n", optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100528 exit(255);
Ben Lindstrom146edb92001-04-11 23:06:28 +0000529 }
Damien Miller95def091999-11-25 00:26:21 +1100530 break;
Damien Miller95def091999-11-25 00:26:21 +1100531 case 'l':
532 options.user = optarg;
533 break;
Ben Lindstrom1a174712001-09-12 17:56:15 +0000534
Damien Miller95def091999-11-25 00:26:21 +1100535 case 'L':
Damien Miller4bf648f2009-02-14 16:28:21 +1100536 if (parse_forward(&fwd, optarg, 0, 0))
Damien Millerf91ee4c2005-03-01 21:24:33 +1100537 add_local_forward(&options, &fwd);
538 else {
Damien Millerf4614452001-07-14 12:18:10 +1000539 fprintf(stderr,
Damien Millerf91ee4c2005-03-01 21:24:33 +1100540 "Bad local forwarding specification '%s'\n",
Damien Millerf4614452001-07-14 12:18:10 +1000541 optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100542 exit(255);
Ben Lindstrom1a174712001-09-12 17:56:15 +0000543 }
Damien Millerf91ee4c2005-03-01 21:24:33 +1100544 break;
545
546 case 'R':
Damien Miller4bf648f2009-02-14 16:28:21 +1100547 if (parse_forward(&fwd, optarg, 0, 1)) {
Damien Millerf91ee4c2005-03-01 21:24:33 +1100548 add_remote_forward(&options, &fwd);
549 } else {
550 fprintf(stderr,
551 "Bad remote forwarding specification "
552 "'%s'\n", optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100553 exit(255);
Damien Millerf91ee4c2005-03-01 21:24:33 +1100554 }
Damien Miller95def091999-11-25 00:26:21 +1100555 break;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000556
557 case 'D':
Damien Miller4bf648f2009-02-14 16:28:21 +1100558 if (parse_forward(&fwd, optarg, 1, 0)) {
Damien Millera699d952008-11-03 19:27:34 +1100559 add_local_forward(&options, &fwd);
Damien Millerf91ee4c2005-03-01 21:24:33 +1100560 } else {
Damien Millera699d952008-11-03 19:27:34 +1100561 fprintf(stderr,
562 "Bad dynamic forwarding specification "
563 "'%s'\n", optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100564 exit(255);
Ben Lindstrom146edb92001-04-11 23:06:28 +0000565 }
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000566 break;
567
Damien Miller95def091999-11-25 00:26:21 +1100568 case 'C':
569 options.compression = 1;
570 break;
Damien Miller1383bd82000-04-06 12:32:37 +1000571 case 'N':
572 no_shell_flag = 1;
Damien Miller21771e22011-05-15 08:45:50 +1000573 options.request_tty = REQUEST_TTY_NO;
Damien Miller1383bd82000-04-06 12:32:37 +1000574 break;
Damien Miller1383bd82000-04-06 12:32:37 +1000575 case 'T':
Damien Miller21771e22011-05-15 08:45:50 +1000576 options.request_tty = REQUEST_TTY_NO;
Damien Miller1383bd82000-04-06 12:32:37 +1000577 break;
Damien Miller95def091999-11-25 00:26:21 +1100578 case 'o':
579 dummy = 1;
Damien Miller9836cf82003-12-17 16:30:06 +1100580 line = xstrdup(optarg);
Damien Millerf4614452001-07-14 12:18:10 +1000581 if (process_config_line(&options, host ? host : "",
Damien Miller9836cf82003-12-17 16:30:06 +1100582 line, "command-line", 0, &dummy) != 0)
Darren Tuckere9a9b712005-12-20 16:15:51 +1100583 exit(255);
Damien Miller9836cf82003-12-17 16:30:06 +1100584 xfree(line);
Damien Miller95def091999-11-25 00:26:21 +1100585 break;
Damien Miller832562e2001-01-30 09:30:01 +1100586 case 's':
587 subsystem_flag = 1;
588 break;
Damien Miller0e220db2004-06-15 10:34:08 +1000589 case 'S':
590 if (options.control_path != NULL)
591 free(options.control_path);
592 options.control_path = xstrdup(optarg);
Damien Miller0e220db2004-06-15 10:34:08 +1000593 break;
Ben Lindstrome0f88042001-04-30 13:06:24 +0000594 case 'b':
595 options.bind_address = optarg;
596 break;
Ben Lindstrom14f31ab2001-09-12 17:48:04 +0000597 case 'F':
598 config = optarg;
599 break;
Damien Miller95def091999-11-25 00:26:21 +1100600 default:
601 usage();
602 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000603 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000604
Damien Millerf4614452001-07-14 12:18:10 +1000605 ac -= optind;
606 av += optind;
607
Darren Tuckerb8c884a2010-01-08 18:53:43 +1100608 if (ac > 0 && !host) {
Ben Lindstromc276c122002-12-23 02:14:51 +0000609 if (strrchr(*av, '@')) {
Damien Millerf4614452001-07-14 12:18:10 +1000610 p = xstrdup(*av);
Ben Lindstromc276c122002-12-23 02:14:51 +0000611 cp = strrchr(p, '@');
Damien Millerf4614452001-07-14 12:18:10 +1000612 if (cp == NULL || cp == p)
613 usage();
614 options.user = p;
615 *cp = '\0';
616 host = ++cp;
617 } else
618 host = *av;
Ben Lindstromb9fa6912002-12-23 02:24:54 +0000619 if (ac > 1) {
620 optind = optreset = 1;
Damien Millerf4614452001-07-14 12:18:10 +1000621 goto again;
622 }
Ben Lindstromb9fa6912002-12-23 02:24:54 +0000623 ac--, av++;
Damien Millerf4614452001-07-14 12:18:10 +1000624 }
625
Damien Miller95def091999-11-25 00:26:21 +1100626 /* Check that we got a host name. */
627 if (!host)
628 usage();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000629
Damien Miller4314c2b2010-09-10 11:12:09 +1000630 OpenSSL_add_all_algorithms();
Damien Miller0bc1bd82000-11-13 22:57:25 +1100631 ERR_load_crypto_strings();
Damien Millercb5e44a2000-09-29 12:12:36 +1100632
Damien Miller95def091999-11-25 00:26:21 +1100633 /* Initialize the command to execute on remote host. */
634 buffer_init(&command);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000635
Damien Miller5428f641999-11-25 11:54:57 +1100636 /*
637 * Save the command to execute on the remote host in a buffer. There
638 * is no limit on the length of the command, except by the maximum
639 * packet size. Also sets the tty flag if there is no command.
640 */
Damien Millerf4614452001-07-14 12:18:10 +1000641 if (!ac) {
Damien Miller95def091999-11-25 00:26:21 +1100642 /* No command specified - execute shell on a tty. */
Damien Miller832562e2001-01-30 09:30:01 +1100643 if (subsystem_flag) {
Damien Millerf4614452001-07-14 12:18:10 +1000644 fprintf(stderr,
645 "You must specify a subsystem to invoke.\n");
Damien Miller832562e2001-01-30 09:30:01 +1100646 usage();
647 }
Damien Miller95def091999-11-25 00:26:21 +1100648 } else {
Damien Millerf4614452001-07-14 12:18:10 +1000649 /* A command has been specified. Store it into the buffer. */
650 for (i = 0; i < ac; i++) {
651 if (i)
Damien Miller95def091999-11-25 00:26:21 +1100652 buffer_append(&command, " ", 1);
653 buffer_append(&command, av[i], strlen(av[i]));
654 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000655 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000656
Damien Miller95def091999-11-25 00:26:21 +1100657 /* Cannot fork to background if no command. */
Darren Tuckerd6173c02008-06-13 04:52:53 +1000658 if (fork_after_authentication_flag && buffer_len(&command) == 0 &&
659 !no_shell_flag)
660 fatal("Cannot fork into background without a command "
661 "to execute.");
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000662
Ben Lindstrom8a432f52001-03-05 07:24:46 +0000663 /*
664 * Initialize "log" output. Since we are the client all output
665 * actually goes to stderr.
666 */
Darren Tucker72efd742009-06-21 17:48:00 +1000667 log_init(argv0,
Darren Tuckerd6173c02008-06-13 04:52:53 +1000668 options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level,
Damien Millere272a5b2008-11-03 19:22:37 +1100669 SYSLOG_FACILITY_USER, !use_syslog);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000670
Ben Lindstrom14f31ab2001-09-12 17:48:04 +0000671 /*
672 * Read per-user configuration file. Ignore the system wide config
673 * file if the user specifies a config file on the command line.
674 */
675 if (config != NULL) {
Damien Miller914420f2004-04-20 20:14:07 +1000676 if (!read_config_file(config, host, &options, 0))
Ben Lindstromedc0cf22001-09-12 18:32:20 +0000677 fatal("Can't open user config file %.100s: "
678 "%.100s", config, strerror(errno));
Damien Miller80163902007-01-05 16:30:16 +1100679 } else {
Darren Tucker199b1342009-07-06 07:16:56 +1000680 r = snprintf(buf, sizeof buf, "%s/%s", pw->pw_dir,
Ben Lindstrom14f31ab2001-09-12 17:48:04 +0000681 _PATH_SSH_USER_CONFFILE);
Darren Tucker199b1342009-07-06 07:16:56 +1000682 if (r > 0 && (size_t)r < sizeof(buf))
683 (void)read_config_file(buf, host, &options, 1);
Ben Lindstrom83f07d12001-10-03 17:22:29 +0000684
Damien Miller765f8c42011-08-06 06:18:16 +1000685 /* Read systemwide configuration file after user config. */
Darren Tuckerfc959702004-07-17 16:12:08 +1000686 (void)read_config_file(_PATH_HOST_CONFIG_FILE, host,
Damien Miller57a44762004-04-20 20:11:57 +1000687 &options, 0);
Ben Lindstrom14f31ab2001-09-12 17:48:04 +0000688 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000689
Damien Miller95def091999-11-25 00:26:21 +1100690 /* Fill configuration defaults. */
691 fill_default_options(&options);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000692
Darren Tucker0a4f04b2003-07-03 20:37:47 +1000693 channel_set_af(options.address_family);
694
Damien Miller95def091999-11-25 00:26:21 +1100695 /* reinit */
Darren Tucker72efd742009-06-21 17:48:00 +1000696 log_init(argv0, options.log_level, SYSLOG_FACILITY_USER, !use_syslog);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000697
Damien Millerfff9f092012-07-06 13:45:01 +1000698 if (options.request_tty == REQUEST_TTY_YES ||
699 options.request_tty == REQUEST_TTY_FORCE)
700 tty_flag = 1;
701
702 /* Allocate a tty by default if no command specified. */
703 if (buffer_len(&command) == 0)
704 tty_flag = options.request_tty != REQUEST_TTY_NO;
705
706 /* Force no tty */
707 if (options.request_tty == REQUEST_TTY_NO || muxclient_command != 0)
708 tty_flag = 0;
709 /* Do not allocate a tty if stdin is not a tty. */
710 if ((!isatty(fileno(stdin)) || stdin_null_flag) &&
711 options.request_tty != REQUEST_TTY_FORCE) {
712 if (tty_flag)
713 logit("Pseudo-terminal will not be allocated because "
714 "stdin is not a terminal.");
715 tty_flag = 0;
716 }
717
Damien Miller60bc5172001-03-19 09:38:15 +1100718 seed_rng();
719
Damien Miller95def091999-11-25 00:26:21 +1100720 if (options.user == NULL)
721 options.user = xstrdup(pw->pw_name);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000722
Darren Tuckerf6b01b72008-06-13 04:56:37 +1000723 /* Get default port if port has not been set. */
724 if (options.port == 0) {
725 sp = getservbyname(SSH_SERVICE_NAME, "tcp");
726 options.port = sp ? ntohs(sp->s_port) : SSH_DEFAULT_PORT;
727 }
728
Damien Miller83f8a402011-01-07 09:51:17 +1100729 /* preserve host name given on command line for %n expansion */
730 host_arg = host;
Damien Millerd0244d42010-07-16 13:56:43 +1000731 if (options.hostname != NULL) {
732 host = percent_expand(options.hostname,
733 "h", host, (char *)NULL);
734 }
735
Damien Millerdfc85fa2011-05-15 08:44:02 +1000736 if (gethostname(thishost, sizeof(thishost)) == -1)
737 fatal("gethostname: %s", strerror(errno));
738 strlcpy(shorthost, thishost, sizeof(shorthost));
739 shorthost[strcspn(thishost, ".")] = '\0';
740 snprintf(portstr, sizeof(portstr), "%d", options.port);
Darren Tuckerf6b01b72008-06-13 04:56:37 +1000741
Damien Millerdfc85fa2011-05-15 08:44:02 +1000742 if (options.local_command != NULL) {
Darren Tuckerf6b01b72008-06-13 04:56:37 +1000743 debug3("expanding LocalCommand: %s", options.local_command);
744 cp = options.local_command;
745 options.local_command = percent_expand(cp, "d", pw->pw_dir,
Damien Miller83f8a402011-01-07 09:51:17 +1100746 "h", host, "l", thishost, "n", host_arg, "r", options.user,
Damien Millerdfc85fa2011-05-15 08:44:02 +1000747 "p", portstr, "u", pw->pw_name, "L", shorthost,
748 (char *)NULL);
Darren Tuckerf6b01b72008-06-13 04:56:37 +1000749 debug3("expanded LocalCommand: %s", options.local_command);
750 xfree(cp);
751 }
752
Darren Tucker3f521e22003-07-03 16:20:42 +1000753 /* force lowercase for hostkey matching */
754 if (options.host_key_alias != NULL) {
755 for (p = options.host_key_alias; *p; p++)
756 if (isupper(*p))
Damien Miller1d2b6702006-03-26 14:09:54 +1100757 *p = (char)tolower(*p);
Darren Tucker3f521e22003-07-03 16:20:42 +1000758 }
759
Damien Miller9f1e33a2003-02-24 11:57:32 +1100760 if (options.proxy_command != NULL &&
Darren Tucker32e42c72007-12-02 23:01:03 +1100761 strcmp(options.proxy_command, "none") == 0) {
762 xfree(options.proxy_command);
Damien Miller9f1e33a2003-02-24 11:57:32 +1100763 options.proxy_command = NULL;
Darren Tucker32e42c72007-12-02 23:01:03 +1100764 }
Damien Miller8f74c8f2005-06-26 08:56:03 +1000765 if (options.control_path != NULL &&
Darren Tucker32e42c72007-12-02 23:01:03 +1100766 strcmp(options.control_path, "none") == 0) {
767 xfree(options.control_path);
Damien Miller8f74c8f2005-06-26 08:56:03 +1000768 options.control_path = NULL;
Darren Tucker32e42c72007-12-02 23:01:03 +1100769 }
Damien Miller9f1e33a2003-02-24 11:57:32 +1100770
Damien Miller0e220db2004-06-15 10:34:08 +1000771 if (options.control_path != NULL) {
Damien Miller6476cad2005-06-16 13:18:34 +1000772 cp = tilde_expand_filename(options.control_path,
773 original_real_uid);
Darren Tucker32e42c72007-12-02 23:01:03 +1100774 xfree(options.control_path);
Damien Millerdfc85fa2011-05-15 08:44:02 +1000775 options.control_path = percent_expand(cp, "h", host,
776 "l", thishost, "n", host_arg, "r", options.user,
777 "p", portstr, "u", pw->pw_name, "L", shorthost,
778 (char *)NULL);
Damien Miller6476cad2005-06-16 13:18:34 +1000779 xfree(cp);
Damien Miller0e220db2004-06-15 10:34:08 +1000780 }
Damien Millerb1cbfa22008-05-19 16:00:08 +1000781 if (muxclient_command != 0 && options.control_path == NULL)
Darren Tucker0814d312005-06-01 23:08:51 +1000782 fatal("No ControlPath specified for \"-O\" command");
Damien Millerd14b1e72005-06-16 13:19:41 +1000783 if (options.control_path != NULL)
Damien Millerb1cbfa22008-05-19 16:00:08 +1000784 muxclient(options.control_path);
Damien Miller0e220db2004-06-15 10:34:08 +1000785
Damien Miller67bd0622007-09-17 12:06:57 +1000786 timeout_ms = options.connection_timeout * 1000;
787
Kevin Stevesfcec7f82000-12-15 19:55:48 +0000788 /* Open a connection to the remote host. */
Darren Tucker0a4f04b2003-07-03 20:37:47 +1000789 if (ssh_connect(host, &hostaddr, options.port,
Damien Miller67bd0622007-09-17 12:06:57 +1000790 options.address_family, options.connection_attempts, &timeout_ms,
791 options.tcp_keep_alive,
Ben Lindstrom1aa64272002-06-11 20:28:05 +0000792#ifdef HAVE_CYGWIN
793 options.use_privileged_port,
794#else
Ben Lindstromf9c48842002-06-11 16:37:51 +0000795 original_effective_uid == 0 && options.use_privileged_port,
Ben Lindstrom1aa64272002-06-11 20:28:05 +0000796#endif
Ben Lindstromda394ca2002-06-12 16:11:12 +0000797 options.proxy_command) != 0)
Darren Tuckere9a9b712005-12-20 16:15:51 +1100798 exit(255);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000799
Damien Miller67bd0622007-09-17 12:06:57 +1000800 if (timeout_ms > 0)
801 debug3("timeout: %d ms remain after connect", timeout_ms);
802
Damien Miller5428f641999-11-25 11:54:57 +1100803 /*
804 * If we successfully made the connection, load the host private key
805 * in case we will need it later for combined rsa-rhosts
806 * authentication. This must be done before releasing extra
807 * privileges, because the file is only readable by root.
Ben Lindstrom9e5bb572002-06-06 19:58:27 +0000808 * If we cannot access the private keys, load the public keys
809 * instead and try to execute the ssh-keysign helper instead.
Damien Miller5428f641999-11-25 11:54:57 +1100810 */
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000811 sensitive_data.nkeys = 0;
812 sensitive_data.keys = NULL;
Ben Lindstrom1bad2562002-06-06 19:57:33 +0000813 sensitive_data.external_keysign = 0;
Ben Lindstrom24157572002-06-12 16:09:39 +0000814 if (options.rhosts_rsa_authentication ||
815 options.hostbased_authentication) {
Damien Millereb8b60e2010-08-31 22:41:14 +1000816 sensitive_data.nkeys = 7;
Damien Millerddd63ab2006-03-31 23:10:51 +1100817 sensitive_data.keys = xcalloc(sensitive_data.nkeys,
Ben Lindstroma962c2f2002-07-04 00:14:17 +0000818 sizeof(Key));
Damien Miller6af914a2010-09-10 11:39:26 +1000819 for (i = 0; i < sensitive_data.nkeys; i++)
820 sensitive_data.keys[i] = NULL;
Ben Lindstromf9c48842002-06-11 16:37:51 +0000821
822 PRIV_START;
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000823 sensitive_data.keys[0] = key_load_private_type(KEY_RSA1,
Darren Tucker232b76f2006-05-06 17:41:51 +1000824 _PATH_HOST_KEY_FILE, "", NULL, NULL);
Damien Millerc1583312010-08-05 13:04:50 +1000825 sensitive_data.keys[1] = key_load_private_cert(KEY_DSA,
826 _PATH_HOST_DSA_KEY_FILE, "", NULL);
Damien Miller6af914a2010-09-10 11:39:26 +1000827#ifdef OPENSSL_HAS_ECC
Damien Millereb8b60e2010-08-31 22:41:14 +1000828 sensitive_data.keys[2] = key_load_private_cert(KEY_ECDSA,
829 _PATH_HOST_ECDSA_KEY_FILE, "", NULL);
Damien Miller6af914a2010-09-10 11:39:26 +1000830#endif
Damien Millereb8b60e2010-08-31 22:41:14 +1000831 sensitive_data.keys[3] = key_load_private_cert(KEY_RSA,
Damien Millerc1583312010-08-05 13:04:50 +1000832 _PATH_HOST_RSA_KEY_FILE, "", NULL);
Damien Millereb8b60e2010-08-31 22:41:14 +1000833 sensitive_data.keys[4] = key_load_private_type(KEY_DSA,
Darren Tucker232b76f2006-05-06 17:41:51 +1000834 _PATH_HOST_DSA_KEY_FILE, "", NULL, NULL);
Damien Miller6af914a2010-09-10 11:39:26 +1000835#ifdef OPENSSL_HAS_ECC
Damien Millereb8b60e2010-08-31 22:41:14 +1000836 sensitive_data.keys[5] = key_load_private_type(KEY_ECDSA,
837 _PATH_HOST_ECDSA_KEY_FILE, "", NULL, NULL);
Damien Miller6af914a2010-09-10 11:39:26 +1000838#endif
Damien Millereb8b60e2010-08-31 22:41:14 +1000839 sensitive_data.keys[6] = key_load_private_type(KEY_RSA,
Darren Tucker232b76f2006-05-06 17:41:51 +1000840 _PATH_HOST_RSA_KEY_FILE, "", NULL, NULL);
Ben Lindstromf9c48842002-06-11 16:37:51 +0000841 PRIV_END;
Ben Lindstrom1bad2562002-06-06 19:57:33 +0000842
Ben Lindstrom5d35a2f2002-07-04 00:19:40 +0000843 if (options.hostbased_authentication == 1 &&
844 sensitive_data.keys[0] == NULL &&
Damien Millereb8b60e2010-08-31 22:41:14 +1000845 sensitive_data.keys[4] == NULL &&
846 sensitive_data.keys[5] == NULL &&
847 sensitive_data.keys[6] == NULL) {
Damien Millerc1583312010-08-05 13:04:50 +1000848 sensitive_data.keys[1] = key_load_cert(
849 _PATH_HOST_DSA_KEY_FILE);
Damien Miller6af914a2010-09-10 11:39:26 +1000850#ifdef OPENSSL_HAS_ECC
Damien Millerc1583312010-08-05 13:04:50 +1000851 sensitive_data.keys[2] = key_load_cert(
Damien Millereb8b60e2010-08-31 22:41:14 +1000852 _PATH_HOST_ECDSA_KEY_FILE);
Damien Miller6af914a2010-09-10 11:39:26 +1000853#endif
Damien Millereb8b60e2010-08-31 22:41:14 +1000854 sensitive_data.keys[3] = key_load_cert(
Damien Millerc1583312010-08-05 13:04:50 +1000855 _PATH_HOST_RSA_KEY_FILE);
Damien Millerc1583312010-08-05 13:04:50 +1000856 sensitive_data.keys[4] = key_load_public(
Damien Millereb8b60e2010-08-31 22:41:14 +1000857 _PATH_HOST_DSA_KEY_FILE, NULL);
Damien Miller6af914a2010-09-10 11:39:26 +1000858#ifdef OPENSSL_HAS_ECC
Damien Millereb8b60e2010-08-31 22:41:14 +1000859 sensitive_data.keys[5] = key_load_public(
860 _PATH_HOST_ECDSA_KEY_FILE, NULL);
Damien Miller6af914a2010-09-10 11:39:26 +1000861#endif
Damien Millereb8b60e2010-08-31 22:41:14 +1000862 sensitive_data.keys[6] = key_load_public(
Ben Lindstrom1bad2562002-06-06 19:57:33 +0000863 _PATH_HOST_RSA_KEY_FILE, NULL);
864 sensitive_data.external_keysign = 1;
865 }
Damien Miller95def091999-11-25 00:26:21 +1100866 }
Damien Miller5428f641999-11-25 11:54:57 +1100867 /*
868 * Get rid of any extra privileges that we may have. We will no
869 * longer need them. Also, extra privileges could make it very hard
870 * to read identity files and other non-world-readable files from the
871 * user's home directory if it happens to be on a NFS volume where
872 * root is mapped to nobody.
873 */
Darren Tucker25f60a72004-08-15 17:23:34 +1000874 if (original_effective_uid == 0) {
875 PRIV_START;
876 permanently_set_uid(pw);
877 }
Damien Miller95def091999-11-25 00:26:21 +1100878
Damien Miller5428f641999-11-25 11:54:57 +1100879 /*
880 * Now that we are back to our own permissions, create ~/.ssh
Damien Miller788f2122005-11-05 15:14:59 +1100881 * directory if it doesn't already exist.
Damien Miller5428f641999-11-25 11:54:57 +1100882 */
Darren Tucker45c66d72011-11-04 10:50:40 +1100883 if (config == NULL) {
884 r = snprintf(buf, sizeof buf, "%s%s%s", pw->pw_dir,
885 strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR);
886 if (r > 0 && (size_t)r < sizeof(buf) && stat(buf, &st) < 0) {
Darren Tucker8ccb7392010-09-10 12:28:24 +1000887#ifdef WITH_SELINUX
Darren Tucker45c66d72011-11-04 10:50:40 +1100888 ssh_selinux_setfscreatecon(buf);
Darren Tucker8ccb7392010-09-10 12:28:24 +1000889#endif
Darren Tucker45c66d72011-11-04 10:50:40 +1100890 if (mkdir(buf, 0700) < 0)
891 error("Could not create directory '%.200s'.",
892 buf);
Darren Tucker8ccb7392010-09-10 12:28:24 +1000893#ifdef WITH_SELINUX
Darren Tucker45c66d72011-11-04 10:50:40 +1100894 ssh_selinux_setfscreatecon(NULL);
Darren Tucker8ccb7392010-09-10 12:28:24 +1000895#endif
Darren Tucker45c66d72011-11-04 10:50:40 +1100896 }
Darren Tucker8ccb7392010-09-10 12:28:24 +1000897 }
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000898 /* load options.identity_files */
899 load_public_identity_files();
900
901 /* Expand ~ in known host file names. */
Damien Miller295ee632011-05-29 21:42:31 +1000902 tilde_expand_paths(options.system_hostfiles,
903 options.num_system_hostfiles);
904 tilde_expand_paths(options.user_hostfiles, options.num_user_hostfiles);
Damien Miller95def091999-11-25 00:26:21 +1100905
Damien Miller07cd5892001-11-12 10:52:03 +1100906 signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
Damien Miller857b02e2010-09-24 22:02:56 +1000907 signal(SIGCHLD, main_sigchld_handler);
Damien Miller07cd5892001-11-12 10:52:03 +1100908
Darren Tuckerd6173c02008-06-13 04:52:53 +1000909 /* Log into the remote system. Never returns if the login fails. */
Damien Miller67bd0622007-09-17 12:06:57 +1000910 ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr,
Damien Millerd925dcd2010-12-01 12:21:51 +1100911 options.port, pw, timeout_ms);
Damien Miller95def091999-11-25 00:26:21 +1100912
Damien Miller383ffe62010-06-26 10:02:03 +1000913 if (packet_connection_is_on_socket()) {
914 verbose("Authenticated to %s ([%s]:%d).", host,
915 get_remote_ipaddr(), get_remote_port());
916 } else {
917 verbose("Authenticated to %s (via proxy).", host);
918 }
919
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000920 /* We no longer need the private host keys. Clear them now. */
921 if (sensitive_data.nkeys != 0) {
922 for (i = 0; i < sensitive_data.nkeys; i++) {
923 if (sensitive_data.keys[i] != NULL) {
924 /* Destroys contents safely */
925 debug3("clear hostkey %d", i);
926 key_free(sensitive_data.keys[i]);
927 sensitive_data.keys[i] = NULL;
928 }
929 }
930 xfree(sensitive_data.keys);
931 }
Ben Lindstroma6c8a8d2001-08-06 21:42:00 +0000932 for (i = 0; i < options.num_identity_files; i++) {
933 if (options.identity_files[i]) {
934 xfree(options.identity_files[i]);
935 options.identity_files[i] = NULL;
936 }
937 if (options.identity_keys[i]) {
938 key_free(options.identity_keys[i]);
939 options.identity_keys[i] = NULL;
940 }
941 }
Damien Miller95def091999-11-25 00:26:21 +1100942
Damien Miller1383bd82000-04-06 12:32:37 +1000943 exit_status = compat20 ? ssh_session2() : ssh_session();
944 packet_close();
Damien Miller8c4e18a2002-09-19 12:05:02 +1000945
Damien Millerb1cbfa22008-05-19 16:00:08 +1000946 if (options.control_path != NULL && muxserver_sock != -1)
Damien Miller0e220db2004-06-15 10:34:08 +1000947 unlink(options.control_path);
948
Damien Millera41ccca2010-10-07 22:07:32 +1100949 /* Kill ProxyCommand if it is running. */
950 ssh_kill_proxy_command();
Damien Miller8c4e18a2002-09-19 12:05:02 +1000951
Damien Miller1383bd82000-04-06 12:32:37 +1000952 return exit_status;
953}
954
Damien Millere11e1ea2010-08-03 16:04:46 +1000955static void
956control_persist_detach(void)
957{
958 pid_t pid;
Damien Miller00d9ae22010-08-17 01:59:31 +1000959 int devnull;
Damien Millere11e1ea2010-08-03 16:04:46 +1000960
961 debug("%s: backgrounding master process", __func__);
962
963 /*
964 * master (current process) into the background, and make the
965 * foreground process a client of the backgrounded master.
966 */
967 switch ((pid = fork())) {
968 case -1:
969 fatal("%s: fork: %s", __func__, strerror(errno));
970 case 0:
971 /* Child: master process continues mainloop */
972 break;
973 default:
974 /* Parent: set up mux slave to connect to backgrounded master */
975 debug2("%s: background process is %ld", __func__, (long)pid);
976 stdin_null_flag = ostdin_null_flag;
Damien Miller21771e22011-05-15 08:45:50 +1000977 options.request_tty = orequest_tty;
Damien Millere11e1ea2010-08-03 16:04:46 +1000978 tty_flag = otty_flag;
979 close(muxserver_sock);
980 muxserver_sock = -1;
Damien Miller5929c522010-09-10 11:17:02 +1000981 options.control_master = SSHCTL_MASTER_NO;
Damien Millere11e1ea2010-08-03 16:04:46 +1000982 muxclient(options.control_path);
983 /* muxclient() doesn't return on success. */
984 fatal("Failed to connect to new control master");
985 }
Damien Miller00d9ae22010-08-17 01:59:31 +1000986 if ((devnull = open(_PATH_DEVNULL, O_RDWR)) == -1) {
987 error("%s: open(\"/dev/null\"): %s", __func__,
988 strerror(errno));
989 } else {
990 if (dup2(devnull, STDIN_FILENO) == -1 ||
991 dup2(devnull, STDOUT_FILENO) == -1)
992 error("%s: dup2: %s", __func__, strerror(errno));
993 if (devnull > STDERR_FILENO)
994 close(devnull);
995 }
Damien Millerea2c1a42011-06-03 12:10:22 +1000996 setproctitle("%s [mux]", options.control_path);
Damien Millere11e1ea2010-08-03 16:04:46 +1000997}
998
999/* Do fork() after authentication. Used by "ssh -f" */
1000static void
1001fork_postauth(void)
1002{
1003 if (need_controlpersist_detach)
1004 control_persist_detach();
1005 debug("forking to background");
1006 fork_after_authentication_flag = 0;
1007 if (daemon(1, 1) < 0)
1008 fatal("daemon() failed: %.200s", strerror(errno));
1009}
1010
Darren Tucker9f407c42008-06-13 04:50:27 +10001011/* Callback for remote forward global requests */
1012static void
1013ssh_confirm_remote_forward(int type, u_int32_t seq, void *ctxt)
1014{
1015 Forward *rfwd = (Forward *)ctxt;
1016
Damien Miller4bf648f2009-02-14 16:28:21 +11001017 /* XXX verbose() on failure? */
Darren Tucker9f407c42008-06-13 04:50:27 +10001018 debug("remote forward %s for: listen %d, connect %s:%d",
1019 type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
1020 rfwd->listen_port, rfwd->connect_host, rfwd->connect_port);
Darren Tucker68afb8c2011-10-02 18:59:03 +11001021 if (rfwd->listen_port == 0) {
1022 if (type == SSH2_MSG_REQUEST_SUCCESS) {
1023 rfwd->allocated_port = packet_get_int();
1024 logit("Allocated port %u for remote forward to %s:%d",
1025 rfwd->allocated_port,
1026 rfwd->connect_host, rfwd->connect_port);
1027 channel_update_permitted_opens(rfwd->handle,
1028 rfwd->allocated_port);
1029 } else {
1030 channel_update_permitted_opens(rfwd->handle, -1);
1031 }
Damien Miller4bf648f2009-02-14 16:28:21 +11001032 }
1033
Darren Tucker9f407c42008-06-13 04:50:27 +10001034 if (type == SSH2_MSG_REQUEST_FAILURE) {
1035 if (options.exit_on_forward_failure)
1036 fatal("Error: remote port forwarding failed for "
1037 "listen port %d", rfwd->listen_port);
1038 else
1039 logit("Warning: remote port forwarding failed for "
1040 "listen port %d", rfwd->listen_port);
1041 }
Darren Tucker9a2a6092008-07-04 12:53:50 +10001042 if (++remote_forward_confirms_received == options.num_remote_forwards) {
Darren Tucker9f407c42008-06-13 04:50:27 +10001043 debug("All remote forwarding requests processed");
Damien Millere11e1ea2010-08-03 16:04:46 +10001044 if (fork_after_authentication_flag)
1045 fork_postauth();
Darren Tucker9a2a6092008-07-04 12:53:50 +10001046 }
Darren Tucker9f407c42008-06-13 04:50:27 +10001047}
1048
Ben Lindstrombba81212001-06-25 05:01:22 +00001049static void
Darren Tucker7ad8dd22010-01-12 19:40:27 +11001050client_cleanup_stdio_fwd(int id, void *arg)
1051{
1052 debug("stdio forwarding: done");
1053 cleanup_exit(0);
1054}
1055
Darren Tucker2d6665d2011-11-04 10:54:22 +11001056static void
1057ssh_init_stdio_forwarding(void)
Darren Tucker7ad8dd22010-01-12 19:40:27 +11001058{
1059 Channel *c;
Damien Millere1537f92010-01-26 13:26:22 +11001060 int in, out;
Darren Tucker7ad8dd22010-01-12 19:40:27 +11001061
Darren Tucker2d6665d2011-11-04 10:54:22 +11001062 if (stdio_forward_host == NULL)
1063 return;
1064 if (!compat20)
1065 fatal("stdio forwarding require Protocol 2");
Damien Millere1537f92010-01-26 13:26:22 +11001066
Darren Tucker2d6665d2011-11-04 10:54:22 +11001067 debug3("%s: %s:%d", __func__, stdio_forward_host, stdio_forward_port);
1068
1069 if ((in = dup(STDIN_FILENO)) < 0 ||
1070 (out = dup(STDOUT_FILENO)) < 0)
Damien Millere1537f92010-01-26 13:26:22 +11001071 fatal("channel_connect_stdio_fwd: dup() in/out failed");
Darren Tucker2d6665d2011-11-04 10:54:22 +11001072 if ((c = channel_connect_stdio_fwd(stdio_forward_host,
1073 stdio_forward_port, in, out)) == NULL)
1074 fatal("%s: channel_connect_stdio_fwd failed", __func__);
Darren Tucker7ad8dd22010-01-12 19:40:27 +11001075 channel_register_cleanup(c->self, client_cleanup_stdio_fwd, 0);
Darren Tucker7ad8dd22010-01-12 19:40:27 +11001076}
1077
1078static void
Damien Miller0bc1bd82000-11-13 22:57:25 +11001079ssh_init_forwarding(void)
1080{
Kevin Steves12057502001-02-05 14:54:34 +00001081 int success = 0;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001082 int i;
Kevin Steves12057502001-02-05 14:54:34 +00001083
Damien Miller0bc1bd82000-11-13 22:57:25 +11001084 /* Initiate local TCP/IP port forwardings. */
1085 for (i = 0; i < options.num_local_forwards; i++) {
Damien Millerf91ee4c2005-03-01 21:24:33 +11001086 debug("Local connections to %.200s:%d forwarded to remote "
1087 "address %.200s:%d",
Darren Tucker47eede72005-03-14 23:08:12 +11001088 (options.local_forwards[i].listen_host == NULL) ?
1089 (options.gateway_ports ? "*" : "LOCALHOST") :
Damien Millerf91ee4c2005-03-01 21:24:33 +11001090 options.local_forwards[i].listen_host,
1091 options.local_forwards[i].listen_port,
1092 options.local_forwards[i].connect_host,
1093 options.local_forwards[i].connect_port);
Damien Millerb16461c2002-01-22 23:29:22 +11001094 success += channel_setup_local_fwd_listener(
Damien Millerf91ee4c2005-03-01 21:24:33 +11001095 options.local_forwards[i].listen_host,
1096 options.local_forwards[i].listen_port,
1097 options.local_forwards[i].connect_host,
1098 options.local_forwards[i].connect_port,
Damien Miller0bc1bd82000-11-13 22:57:25 +11001099 options.gateway_ports);
1100 }
Darren Tuckere7d4b192006-07-12 22:17:10 +10001101 if (i > 0 && success != i && options.exit_on_forward_failure)
1102 fatal("Could not request local forwarding.");
Kevin Steves12057502001-02-05 14:54:34 +00001103 if (i > 0 && success == 0)
1104 error("Could not request local forwarding.");
Damien Miller0bc1bd82000-11-13 22:57:25 +11001105
1106 /* Initiate remote TCP/IP port forwardings. */
1107 for (i = 0; i < options.num_remote_forwards; i++) {
Damien Millerf91ee4c2005-03-01 21:24:33 +11001108 debug("Remote connections from %.200s:%d forwarded to "
1109 "local address %.200s:%d",
Damien Miller46d38de2005-07-17 17:02:09 +10001110 (options.remote_forwards[i].listen_host == NULL) ?
Damien Milleraa3bb102005-11-05 15:12:59 +11001111 "LOCALHOST" : options.remote_forwards[i].listen_host,
Damien Millerf91ee4c2005-03-01 21:24:33 +11001112 options.remote_forwards[i].listen_port,
1113 options.remote_forwards[i].connect_host,
1114 options.remote_forwards[i].connect_port);
Darren Tucker68afb8c2011-10-02 18:59:03 +11001115 options.remote_forwards[i].handle =
1116 channel_request_remote_forwarding(
Damien Millerf91ee4c2005-03-01 21:24:33 +11001117 options.remote_forwards[i].listen_host,
1118 options.remote_forwards[i].listen_port,
1119 options.remote_forwards[i].connect_host,
Darren Tucker68afb8c2011-10-02 18:59:03 +11001120 options.remote_forwards[i].connect_port);
1121 if (options.remote_forwards[i].handle < 0) {
Darren Tuckere7d4b192006-07-12 22:17:10 +10001122 if (options.exit_on_forward_failure)
1123 fatal("Could not request remote forwarding.");
1124 else
1125 logit("Warning: Could not request remote "
1126 "forwarding.");
Darren Tucker68afb8c2011-10-02 18:59:03 +11001127 } else {
1128 client_register_global_confirm(ssh_confirm_remote_forward,
1129 &options.remote_forwards[i]);
Darren Tuckere7d4b192006-07-12 22:17:10 +10001130 }
Damien Miller0bc1bd82000-11-13 22:57:25 +11001131 }
Damien Millerb3ce9fe2007-08-08 14:32:41 +10001132
1133 /* Initiate tunnel forwarding. */
1134 if (options.tun_open != SSH_TUNMODE_NO) {
1135 if (client_request_tun_fwd(options.tun_open,
1136 options.tun_local, options.tun_remote) == -1) {
1137 if (options.exit_on_forward_failure)
1138 fatal("Could not request tunnel forwarding.");
1139 else
1140 error("Could not request tunnel forwarding.");
1141 }
1142 }
Damien Miller0bc1bd82000-11-13 22:57:25 +11001143}
1144
Ben Lindstrombba81212001-06-25 05:01:22 +00001145static void
Damien Miller0bc1bd82000-11-13 22:57:25 +11001146check_agent_present(void)
1147{
1148 if (options.forward_agent) {
Damien Miller788f2122005-11-05 15:14:59 +11001149 /* Clear agent forwarding if we don't have an agent. */
Damien Miller789e95d2002-09-12 09:52:46 +10001150 if (!ssh_agent_present())
Damien Miller0bc1bd82000-11-13 22:57:25 +11001151 options.forward_agent = 0;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001152 }
1153}
1154
Ben Lindstrombba81212001-06-25 05:01:22 +00001155static int
Damien Miller1383bd82000-04-06 12:32:37 +10001156ssh_session(void)
1157{
1158 int type;
Damien Miller1383bd82000-04-06 12:32:37 +10001159 int interactive = 0;
1160 int have_tty = 0;
1161 struct winsize ws;
Damien Miller1383bd82000-04-06 12:32:37 +10001162 char *cp;
Damien Miller17e7ed02005-06-17 12:54:33 +10001163 const char *display;
Damien Miller1383bd82000-04-06 12:32:37 +10001164
Damien Miller95def091999-11-25 00:26:21 +11001165 /* Enable compression if requested. */
1166 if (options.compression) {
Darren Tuckerd6173c02008-06-13 04:52:53 +10001167 debug("Requesting compression at level %d.",
1168 options.compression_level);
Damien Miller95def091999-11-25 00:26:21 +11001169
Darren Tuckerd6173c02008-06-13 04:52:53 +10001170 if (options.compression_level < 1 ||
1171 options.compression_level > 9)
1172 fatal("Compression level must be from 1 (fast) to "
1173 "9 (slow, best).");
Damien Miller95def091999-11-25 00:26:21 +11001174
1175 /* Send the request. */
1176 packet_start(SSH_CMSG_REQUEST_COMPRESSION);
1177 packet_put_int(options.compression_level);
1178 packet_send();
1179 packet_write_wait();
Damien Millerdff50992002-01-22 23:16:32 +11001180 type = packet_read();
Damien Miller95def091999-11-25 00:26:21 +11001181 if (type == SSH_SMSG_SUCCESS)
1182 packet_start_compression(options.compression_level);
1183 else if (type == SSH_SMSG_FAILURE)
Damien Miller996acd22003-04-09 20:59:48 +10001184 logit("Warning: Remote host refused compression.");
Damien Miller95def091999-11-25 00:26:21 +11001185 else
Darren Tuckerd6173c02008-06-13 04:52:53 +10001186 packet_disconnect("Protocol error waiting for "
1187 "compression response.");
Damien Miller95def091999-11-25 00:26:21 +11001188 }
1189 /* Allocate a pseudo tty if appropriate. */
1190 if (tty_flag) {
1191 debug("Requesting pty.");
1192
1193 /* Start the packet. */
1194 packet_start(SSH_CMSG_REQUEST_PTY);
1195
1196 /* Store TERM in the packet. There is no limit on the
1197 length of the string. */
1198 cp = getenv("TERM");
1199 if (!cp)
1200 cp = "";
Ben Lindstrom664408d2001-06-09 01:42:01 +00001201 packet_put_cstring(cp);
Damien Miller95def091999-11-25 00:26:21 +11001202
1203 /* Store window size in the packet. */
1204 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
1205 memset(&ws, 0, sizeof(ws));
Damien Miller71a73672006-03-26 14:04:36 +11001206 packet_put_int((u_int)ws.ws_row);
1207 packet_put_int((u_int)ws.ws_col);
1208 packet_put_int((u_int)ws.ws_xpixel);
1209 packet_put_int((u_int)ws.ws_ypixel);
Damien Miller95def091999-11-25 00:26:21 +11001210
1211 /* Store tty modes in the packet. */
Ben Lindstromae8e2d32001-04-14 23:13:02 +00001212 tty_make_modes(fileno(stdin), NULL);
Damien Miller95def091999-11-25 00:26:21 +11001213
1214 /* Send the packet, and wait for it to leave. */
1215 packet_send();
1216 packet_write_wait();
1217
1218 /* Read response from the server. */
Damien Millerdff50992002-01-22 23:16:32 +11001219 type = packet_read();
Damien Miller450a7a12000-03-26 13:04:51 +10001220 if (type == SSH_SMSG_SUCCESS) {
Damien Miller95def091999-11-25 00:26:21 +11001221 interactive = 1;
Damien Miller1383bd82000-04-06 12:32:37 +10001222 have_tty = 1;
Damien Miller450a7a12000-03-26 13:04:51 +10001223 } else if (type == SSH_SMSG_FAILURE)
Darren Tuckerd6173c02008-06-13 04:52:53 +10001224 logit("Warning: Remote host failed or refused to "
1225 "allocate a pseudo tty.");
Damien Miller95def091999-11-25 00:26:21 +11001226 else
Darren Tuckerd6173c02008-06-13 04:52:53 +10001227 packet_disconnect("Protocol error waiting for pty "
1228 "request response.");
Damien Miller95def091999-11-25 00:26:21 +11001229 }
1230 /* Request X11 forwarding if enabled and DISPLAY is set. */
Damien Miller17e7ed02005-06-17 12:54:33 +10001231 display = getenv("DISPLAY");
1232 if (options.forward_x11 && display != NULL) {
Ben Lindstrom4a4bd712001-12-06 17:45:19 +00001233 char *proto, *data;
Damien Millerbd483e72000-04-30 10:00:53 +10001234 /* Get reasonable local authentication information. */
Damien Miller17e7ed02005-06-17 12:54:33 +10001235 client_x11_get_proto(display, options.xauth_location,
Damien Miller1ab6a512010-06-26 10:02:24 +10001236 options.forward_x11_trusted,
1237 options.forward_x11_timeout,
1238 &proto, &data);
Damien Millerbd483e72000-04-30 10:00:53 +10001239 /* Request forwarding with authentication spoofing. */
Darren Tuckerd6173c02008-06-13 04:52:53 +10001240 debug("Requesting X11 forwarding with authentication "
1241 "spoofing.");
Damien Miller6d7b4372011-06-23 08:31:57 +10001242 x11_request_forwarding_with_spoofing(0, display, proto,
1243 data, 0);
Damien Miller95def091999-11-25 00:26:21 +11001244 /* Read response from the server. */
Damien Millerdff50992002-01-22 23:16:32 +11001245 type = packet_read();
Damien Miller95def091999-11-25 00:26:21 +11001246 if (type == SSH_SMSG_SUCCESS) {
Damien Miller95def091999-11-25 00:26:21 +11001247 interactive = 1;
Damien Millerbd483e72000-04-30 10:00:53 +10001248 } else if (type == SSH_SMSG_FAILURE) {
Damien Miller996acd22003-04-09 20:59:48 +10001249 logit("Warning: Remote host denied X11 forwarding.");
Damien Millerbd483e72000-04-30 10:00:53 +10001250 } else {
Darren Tuckerd6173c02008-06-13 04:52:53 +10001251 packet_disconnect("Protocol error waiting for X11 "
1252 "forwarding");
Damien Millerbd483e72000-04-30 10:00:53 +10001253 }
Damien Miller95def091999-11-25 00:26:21 +11001254 }
1255 /* Tell the packet module whether this is an interactive session. */
Damien Miller0dac6fb2010-11-20 15:19:38 +11001256 packet_set_interactive(interactive,
1257 options.ip_qos_interactive, options.ip_qos_bulk);
Damien Miller95def091999-11-25 00:26:21 +11001258
1259 /* Request authentication agent forwarding if appropriate. */
Damien Miller0bc1bd82000-11-13 22:57:25 +11001260 check_agent_present();
1261
Damien Miller95def091999-11-25 00:26:21 +11001262 if (options.forward_agent) {
1263 debug("Requesting authentication agent forwarding.");
1264 auth_request_forwarding();
1265
1266 /* Read response from the server. */
Damien Millerdff50992002-01-22 23:16:32 +11001267 type = packet_read();
Damien Miller48b03fc2002-01-22 23:11:40 +11001268 packet_check_eom();
Damien Miller95def091999-11-25 00:26:21 +11001269 if (type != SSH_SMSG_SUCCESS)
Damien Miller996acd22003-04-09 20:59:48 +10001270 logit("Warning: Remote host denied authentication agent forwarding.");
Damien Miller95def091999-11-25 00:26:21 +11001271 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001272
Damien Miller0bc1bd82000-11-13 22:57:25 +11001273 /* Initiate port forwardings. */
Darren Tucker2d6665d2011-11-04 10:54:22 +11001274 ssh_init_stdio_forwarding();
Damien Miller0bc1bd82000-11-13 22:57:25 +11001275 ssh_init_forwarding();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001276
Darren Tuckerb776c852007-12-02 23:06:35 +11001277 /* Execute a local command */
1278 if (options.local_command != NULL &&
1279 options.permit_local_command)
1280 ssh_local_cmd(options.local_command);
1281
Darren Tucker9a2a6092008-07-04 12:53:50 +10001282 /*
1283 * If requested and we are not interested in replies to remote
1284 * forwarding requests, then let ssh continue in the background.
1285 */
Damien Millere11e1ea2010-08-03 16:04:46 +10001286 if (fork_after_authentication_flag) {
1287 if (options.exit_on_forward_failure &&
1288 options.num_remote_forwards > 0) {
1289 debug("deferring postauth fork until remote forward "
1290 "confirmation received");
1291 } else
1292 fork_postauth();
Darren Tucker9a2a6092008-07-04 12:53:50 +10001293 }
Damien Miller5428f641999-11-25 11:54:57 +11001294
1295 /*
1296 * If a command was specified on the command line, execute the
1297 * command now. Otherwise request the server to start a shell.
1298 */
Damien Miller95def091999-11-25 00:26:21 +11001299 if (buffer_len(&command) > 0) {
1300 int len = buffer_len(&command);
1301 if (len > 900)
1302 len = 900;
Darren Tuckerd6173c02008-06-13 04:52:53 +10001303 debug("Sending command: %.*s", len,
1304 (u_char *)buffer_ptr(&command));
Damien Miller95def091999-11-25 00:26:21 +11001305 packet_start(SSH_CMSG_EXEC_CMD);
1306 packet_put_string(buffer_ptr(&command), buffer_len(&command));
1307 packet_send();
1308 packet_write_wait();
1309 } else {
1310 debug("Requesting shell.");
1311 packet_start(SSH_CMSG_EXEC_SHELL);
1312 packet_send();
1313 packet_write_wait();
1314 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001315
Damien Miller95def091999-11-25 00:26:21 +11001316 /* Enter the interactive session. */
Ben Lindstrom2b1f71b2001-06-05 20:32:21 +00001317 return client_loop(have_tty, tty_flag ?
1318 options.escape_char : SSH_ESCAPECHAR_NONE, 0);
Damien Miller1383bd82000-04-06 12:32:37 +10001319}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001320
Ben Lindstromf558cf62001-09-20 23:13:49 +00001321/* request pty/x11/agent/tcpfwd/shell for channel */
Ben Lindstrombba81212001-06-25 05:01:22 +00001322static void
Damien Millerd530f5f2010-05-21 14:57:10 +10001323ssh_session2_setup(int id, int success, void *arg)
Damien Miller1383bd82000-04-06 12:32:37 +10001324{
Damien Miller3756dce2004-06-18 01:17:29 +10001325 extern char **environ;
Damien Miller17e7ed02005-06-17 12:54:33 +10001326 const char *display;
Damien Miller0e220db2004-06-15 10:34:08 +10001327 int interactive = tty_flag;
Damien Miller17e7ed02005-06-17 12:54:33 +10001328
Damien Millerd530f5f2010-05-21 14:57:10 +10001329 if (!success)
1330 return; /* No need for error message, channels code sens one */
1331
Damien Miller46d38de2005-07-17 17:02:09 +10001332 display = getenv("DISPLAY");
Damien Miller17e7ed02005-06-17 12:54:33 +10001333 if (options.forward_x11 && display != NULL) {
Ben Lindstrom4a4bd712001-12-06 17:45:19 +00001334 char *proto, *data;
Damien Millerbd483e72000-04-30 10:00:53 +10001335 /* Get reasonable local authentication information. */
Damien Miller17e7ed02005-06-17 12:54:33 +10001336 client_x11_get_proto(display, options.xauth_location,
Damien Miller1ab6a512010-06-26 10:02:24 +10001337 options.forward_x11_trusted,
1338 options.forward_x11_timeout, &proto, &data);
Damien Millerbd483e72000-04-30 10:00:53 +10001339 /* Request forwarding with authentication spoofing. */
Darren Tuckerd6173c02008-06-13 04:52:53 +10001340 debug("Requesting X11 forwarding with authentication "
1341 "spoofing.");
Damien Miller6d7b4372011-06-23 08:31:57 +10001342 x11_request_forwarding_with_spoofing(id, display, proto,
1343 data, 1);
1344 client_expect_confirm(id, "X11 forwarding", CONFIRM_WARN);
1345 /* XXX exit_on_forward_failure */
Ben Lindstrombf555ba2001-01-18 02:04:35 +00001346 interactive = 1;
Damien Millerbd483e72000-04-30 10:00:53 +10001347 }
1348
Damien Miller0bc1bd82000-11-13 22:57:25 +11001349 check_agent_present();
1350 if (options.forward_agent) {
1351 debug("Requesting authentication agent forwarding.");
1352 channel_request_start(id, "auth-agent-req@openssh.com", 0);
1353 packet_send();
1354 }
1355
Darren Tucker7b305012012-07-02 18:55:09 +10001356 /* Tell the packet module whether this is an interactive session. */
1357 packet_set_interactive(interactive,
1358 options.ip_qos_interactive, options.ip_qos_bulk);
1359
Damien Miller0e220db2004-06-15 10:34:08 +10001360 client_session2_setup(id, tty_flag, subsystem_flag, getenv("TERM"),
Damien Miller5771ed72008-05-19 15:35:33 +10001361 NULL, fileno(stdin), &command, environ);
Damien Miller1383bd82000-04-06 12:32:37 +10001362}
1363
Ben Lindstromf558cf62001-09-20 23:13:49 +00001364/* open new channel for a session */
Ben Lindstrombba81212001-06-25 05:01:22 +00001365static int
Ben Lindstromf558cf62001-09-20 23:13:49 +00001366ssh_session2_open(void)
Damien Miller1383bd82000-04-06 12:32:37 +10001367{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001368 Channel *c;
1369 int window, packetmax, in, out, err;
Damien Millerad833b32000-08-23 10:46:23 +10001370
Damien Millercaf6dd62000-08-29 11:33:50 +11001371 if (stdin_null_flag) {
Ben Lindstrom31ca54a2001-02-09 02:11:24 +00001372 in = open(_PATH_DEVNULL, O_RDONLY);
Damien Millercaf6dd62000-08-29 11:33:50 +11001373 } else {
1374 in = dup(STDIN_FILENO);
1375 }
1376 out = dup(STDOUT_FILENO);
1377 err = dup(STDERR_FILENO);
1378
1379 if (in < 0 || out < 0 || err < 0)
1380 fatal("dup() in/out/err failed");
1381
Damien Miller69b69aa2000-10-28 14:19:58 +11001382 /* enable nonblocking unless tty */
1383 if (!isatty(in))
1384 set_nonblock(in);
1385 if (!isatty(out))
1386 set_nonblock(out);
1387 if (!isatty(err))
1388 set_nonblock(err);
1389
Damien Millere4340be2000-09-16 13:29:08 +11001390 window = CHAN_SES_WINDOW_DEFAULT;
1391 packetmax = CHAN_SES_PACKET_DEFAULT;
Damien Miller19a59452002-02-19 15:20:57 +11001392 if (tty_flag) {
1393 window >>= 1;
1394 packetmax >>= 1;
Damien Miller1383bd82000-04-06 12:32:37 +10001395 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001396 c = channel_new(
Damien Miller1383bd82000-04-06 12:32:37 +10001397 "session", SSH_CHANNEL_OPENING, in, out, err,
Damien Millere4340be2000-09-16 13:29:08 +11001398 window, packetmax, CHAN_EXTENDED_WRITE,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10001399 "client-session", /*nonblock*/0);
Damien Miller1383bd82000-04-06 12:32:37 +10001400
Ben Lindstromf558cf62001-09-20 23:13:49 +00001401 debug3("ssh_session2_open: channel_new: %d", c->self);
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001402
Ben Lindstrom5ec26452001-06-09 00:18:51 +00001403 channel_send_open(c->self);
Ben Lindstromf558cf62001-09-20 23:13:49 +00001404 if (!no_shell_flag)
Damien Millerb84886b2008-05-19 15:05:07 +10001405 channel_register_open_confirm(c->self,
1406 ssh_session2_setup, NULL);
Damien Miller1383bd82000-04-06 12:32:37 +10001407
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001408 return c->self;
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001409}
1410
Ben Lindstrombba81212001-06-25 05:01:22 +00001411static int
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001412ssh_session2(void)
1413{
Ben Lindstromf558cf62001-09-20 23:13:49 +00001414 int id = -1;
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001415
1416 /* XXX should be pre-session */
Darren Tucker2d6665d2011-11-04 10:54:22 +11001417 if (!options.control_persist)
1418 ssh_init_stdio_forwarding();
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001419 ssh_init_forwarding();
1420
Damien Millere11e1ea2010-08-03 16:04:46 +10001421 /* Start listening for multiplex clients */
1422 muxserver_listen();
1423
1424 /*
Darren Tucker2d6665d2011-11-04 10:54:22 +11001425 * If we are in control persist mode and have a working mux listen
1426 * socket, then prepare to background ourselves and have a foreground
1427 * client attach as a control slave.
1428 * NB. we must save copies of the flags that we override for
Damien Millere11e1ea2010-08-03 16:04:46 +10001429 * the backgrounding, since we defer attachment of the slave until
1430 * after the connection is fully established (in particular,
1431 * async rfwd replies have been received for ExitOnForwardFailure).
1432 */
1433 if (options.control_persist && muxserver_sock != -1) {
1434 ostdin_null_flag = stdin_null_flag;
1435 ono_shell_flag = no_shell_flag;
Damien Miller21771e22011-05-15 08:45:50 +10001436 orequest_tty = options.request_tty;
Damien Millere11e1ea2010-08-03 16:04:46 +10001437 otty_flag = tty_flag;
1438 stdin_null_flag = 1;
1439 no_shell_flag = 1;
Damien Millere11e1ea2010-08-03 16:04:46 +10001440 tty_flag = 0;
1441 if (!fork_after_authentication_flag)
1442 need_controlpersist_detach = 1;
1443 fork_after_authentication_flag = 1;
1444 }
Darren Tucker2d6665d2011-11-04 10:54:22 +11001445 /*
1446 * ControlPersist mux listen socket setup failed, attempt the
1447 * stdio forward setup that we skipped earlier.
1448 */
1449 if (options.control_persist && muxserver_sock == -1)
1450 ssh_init_stdio_forwarding();
Damien Millere11e1ea2010-08-03 16:04:46 +10001451
Ben Lindstromf558cf62001-09-20 23:13:49 +00001452 if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN))
1453 id = ssh_session2_open();
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001454
Darren Tucker8901fa92008-06-11 09:34:01 +10001455 /* If we don't expect to open a new session, then disallow it */
Damien Miller456e6f02008-11-03 19:20:10 +11001456 if (options.control_master == SSHCTL_MASTER_NO &&
1457 (datafellows & SSH_NEW_OPENSSH)) {
Darren Tucker8901fa92008-06-11 09:34:01 +10001458 debug("Requesting no-more-sessions@openssh.com");
1459 packet_start(SSH2_MSG_GLOBAL_REQUEST);
1460 packet_put_cstring("no-more-sessions@openssh.com");
1461 packet_put_char(0);
1462 packet_send();
1463 }
1464
Damien Millerd27b9472005-12-13 19:29:02 +11001465 /* Execute a local command */
1466 if (options.local_command != NULL &&
1467 options.permit_local_command)
1468 ssh_local_cmd(options.local_command);
1469
Damien Miller1f25ab42010-07-16 13:56:23 +10001470 /*
1471 * If requested and we are not interested in replies to remote
1472 * forwarding requests, then let ssh continue in the background.
1473 */
Damien Millere11e1ea2010-08-03 16:04:46 +10001474 if (fork_after_authentication_flag) {
1475 if (options.exit_on_forward_failure &&
1476 options.num_remote_forwards > 0) {
1477 debug("deferring postauth fork until remote forward "
1478 "confirmation received");
1479 } else
1480 fork_postauth();
Darren Tucker9a2a6092008-07-04 12:53:50 +10001481 }
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001482
Darren Tuckerf1de4e52010-01-08 16:54:59 +11001483 if (options.use_roaming)
1484 request_roaming();
1485
Ben Lindstrom2b1f71b2001-06-05 20:32:21 +00001486 return client_loop(tty_flag, tty_flag ?
1487 options.escape_char : SSH_ESCAPECHAR_NONE, id);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001488}
Damien Miller0bc1bd82000-11-13 22:57:25 +11001489
Ben Lindstrombba81212001-06-25 05:01:22 +00001490static void
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001491load_public_identity_files(void)
1492{
Damien Miller6b1d53c2006-03-31 23:13:21 +11001493 char *filename, *cp, thishost[NI_MAXHOST];
Darren Tuckerb4fbbc62007-12-02 23:16:32 +11001494 char *pwdir = NULL, *pwname = NULL;
Ben Lindstrom711b04a2001-08-06 21:12:42 +00001495 int i = 0;
Ben Lindstrom0936a5b2002-03-26 03:17:42 +00001496 Key *public;
Damien Miller6b1d53c2006-03-31 23:13:21 +11001497 struct passwd *pw;
Damien Miller0a80ca12010-02-27 07:55:05 +11001498 u_int n_ids;
1499 char *identity_files[SSH_MAX_IDENTITY_FILES];
1500 Key *identity_keys[SSH_MAX_IDENTITY_FILES];
Damien Miller7ea845e2010-02-12 09:21:02 +11001501#ifdef ENABLE_PKCS11
Ben Lindstrom0936a5b2002-03-26 03:17:42 +00001502 Key **keys;
Damien Miller7ea845e2010-02-12 09:21:02 +11001503 int nkeys;
Damien Miller0a80ca12010-02-27 07:55:05 +11001504#endif /* PKCS11 */
Ben Lindstrom0936a5b2002-03-26 03:17:42 +00001505
Damien Miller0a80ca12010-02-27 07:55:05 +11001506 n_ids = 0;
1507 bzero(identity_files, sizeof(identity_files));
1508 bzero(identity_keys, sizeof(identity_keys));
1509
1510#ifdef ENABLE_PKCS11
Damien Miller7ea845e2010-02-12 09:21:02 +11001511 if (options.pkcs11_provider != NULL &&
Ben Lindstrom0936a5b2002-03-26 03:17:42 +00001512 options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
Damien Miller7ea845e2010-02-12 09:21:02 +11001513 (pkcs11_init(!options.batch_mode) == 0) &&
1514 (nkeys = pkcs11_add_provider(options.pkcs11_provider, NULL,
1515 &keys)) > 0) {
Damien Miller7ea845e2010-02-12 09:21:02 +11001516 for (i = 0; i < nkeys; i++) {
Damien Miller0a80ca12010-02-27 07:55:05 +11001517 if (n_ids >= SSH_MAX_IDENTITY_FILES) {
1518 key_free(keys[i]);
1519 continue;
1520 }
1521 identity_keys[n_ids] = keys[i];
1522 identity_files[n_ids] =
Damien Miller7ea845e2010-02-12 09:21:02 +11001523 xstrdup(options.pkcs11_provider); /* XXX */
Damien Miller0a80ca12010-02-27 07:55:05 +11001524 n_ids++;
Ben Lindstrom0936a5b2002-03-26 03:17:42 +00001525 }
Ben Lindstrom0936a5b2002-03-26 03:17:42 +00001526 xfree(keys);
Ben Lindstrom711b04a2001-08-06 21:12:42 +00001527 }
Damien Miller7ea845e2010-02-12 09:21:02 +11001528#endif /* ENABLE_PKCS11 */
Damien Miller6b1d53c2006-03-31 23:13:21 +11001529 if ((pw = getpwuid(original_real_uid)) == NULL)
1530 fatal("load_public_identity_files: getpwuid failed");
Darren Tuckere143f062007-12-02 23:21:16 +11001531 pwname = xstrdup(pw->pw_name);
1532 pwdir = xstrdup(pw->pw_dir);
Damien Miller6b1d53c2006-03-31 23:13:21 +11001533 if (gethostname(thishost, sizeof(thishost)) == -1)
1534 fatal("load_public_identity_files: gethostname: %s",
1535 strerror(errno));
Damien Miller0a80ca12010-02-27 07:55:05 +11001536 for (i = 0; i < options.num_identity_files; i++) {
1537 if (n_ids >= SSH_MAX_IDENTITY_FILES) {
1538 xfree(options.identity_files[i]);
1539 continue;
1540 }
Damien Miller6b1d53c2006-03-31 23:13:21 +11001541 cp = tilde_expand_filename(options.identity_files[i],
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001542 original_real_uid);
Darren Tuckerb4fbbc62007-12-02 23:16:32 +11001543 filename = percent_expand(cp, "d", pwdir,
1544 "u", pwname, "l", thishost, "h", host,
Damien Miller6b1d53c2006-03-31 23:13:21 +11001545 "r", options.user, (char *)NULL);
1546 xfree(cp);
Ben Lindstromd0fca422001-03-26 13:44:06 +00001547 public = key_load_public(filename, NULL);
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001548 debug("identity file %s type %d", filename,
1549 public ? public->type : -1);
1550 xfree(options.identity_files[i]);
Damien Miller0a80ca12010-02-27 07:55:05 +11001551 identity_files[n_ids] = filename;
1552 identity_keys[n_ids] = public;
1553
1554 if (++n_ids >= SSH_MAX_IDENTITY_FILES)
1555 continue;
1556
1557 /* Try to add the certificate variant too */
1558 xasprintf(&cp, "%s-cert", filename);
1559 public = key_load_public(cp, NULL);
1560 debug("identity file %s type %d", cp,
1561 public ? public->type : -1);
1562 if (public == NULL) {
1563 xfree(cp);
1564 continue;
1565 }
1566 if (!key_is_cert(public)) {
1567 debug("%s: key %s type %s is not a certificate",
1568 __func__, cp, key_type(public));
1569 key_free(public);
1570 xfree(cp);
1571 continue;
1572 }
1573 identity_keys[n_ids] = public;
1574 /* point to the original path, most likely the private key */
1575 identity_files[n_ids] = xstrdup(filename);
1576 n_ids++;
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001577 }
Damien Miller0a80ca12010-02-27 07:55:05 +11001578 options.num_identity_files = n_ids;
1579 memcpy(options.identity_files, identity_files, sizeof(identity_files));
1580 memcpy(options.identity_keys, identity_keys, sizeof(identity_keys));
1581
Darren Tuckerb4fbbc62007-12-02 23:16:32 +11001582 bzero(pwname, strlen(pwname));
Darren Tuckere143f062007-12-02 23:21:16 +11001583 xfree(pwname);
Darren Tuckerb4fbbc62007-12-02 23:16:32 +11001584 bzero(pwdir, strlen(pwdir));
Darren Tuckere143f062007-12-02 23:21:16 +11001585 xfree(pwdir);
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001586}
Damien Miller857b02e2010-09-24 22:02:56 +10001587
1588static void
1589main_sigchld_handler(int sig)
1590{
1591 int save_errno = errno;
1592 pid_t pid;
1593 int status;
1594
1595 while ((pid = waitpid(-1, &status, WNOHANG)) > 0 ||
1596 (pid < 0 && errno == EINTR))
1597 ;
1598
1599 signal(sig, main_sigchld_handler);
1600 errno = save_errno;
1601}
1602