blob: 3f61eb02828a0eb9370b20b17ea6769f587daabe [file] [log] [blame]
Damien Millerfff9f092012-07-06 13:45:01 +10001/* $OpenBSD: ssh.c,v 1.370 2012/07/06 01:47:38 djm 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 }
Damien Millerf4614452001-07-14 12:18:10 +1000408 if (options.num_identity_files >=
409 SSH_MAX_IDENTITY_FILES)
410 fatal("Too many identity files specified "
411 "(max %d)", SSH_MAX_IDENTITY_FILES);
412 options.identity_files[options.num_identity_files++] =
413 xstrdup(optarg);
Damien Miller95def091999-11-25 00:26:21 +1100414 break;
Ben Lindstromc5b68002001-07-04 04:52:03 +0000415 case 'I':
Damien Miller7ea845e2010-02-12 09:21:02 +1100416#ifdef ENABLE_PKCS11
417 options.pkcs11_provider = xstrdup(optarg);
Ben Lindstrombcc18082001-08-06 21:59:25 +0000418#else
Damien Miller7ea845e2010-02-12 09:21:02 +1100419 fprintf(stderr, "no support for PKCS#11.\n");
Ben Lindstrombcc18082001-08-06 21:59:25 +0000420#endif
Ben Lindstromc5b68002001-07-04 04:52:03 +0000421 break;
Damien Miller95def091999-11-25 00:26:21 +1100422 case 't':
Damien Miller21771e22011-05-15 08:45:50 +1000423 if (options.request_tty == REQUEST_TTY_YES)
424 options.request_tty = REQUEST_TTY_FORCE;
425 else
426 options.request_tty = REQUEST_TTY_YES;
Damien Miller95def091999-11-25 00:26:21 +1100427 break;
Damien Miller95def091999-11-25 00:26:21 +1100428 case 'v':
Darren Tuckere98dfa32003-07-19 19:54:31 +1000429 if (debug_flag == 0) {
Damien Millere4340be2000-09-16 13:29:08 +1100430 debug_flag = 1;
431 options.log_level = SYSLOG_LEVEL_DEBUG1;
Darren Tuckere98dfa32003-07-19 19:54:31 +1000432 } else {
433 if (options.log_level < SYSLOG_LEVEL_DEBUG3)
434 options.log_level++;
Damien Millere4340be2000-09-16 13:29:08 +1100435 break;
Darren Tuckere98dfa32003-07-19 19:54:31 +1000436 }
Darren Tuckere9bf9842004-11-05 20:05:32 +1100437 /* FALLTHROUGH */
Damien Miller95def091999-11-25 00:26:21 +1100438 case 'V':
Damien Miller0c889cd2004-03-22 09:36:00 +1100439 fprintf(stderr, "%s, %s\n",
Damien Miller2aa6d3c2004-09-12 16:53:04 +1000440 SSH_RELEASE, SSLeay_version(SSLEAY_VERSION));
Damien Miller95def091999-11-25 00:26:21 +1100441 if (opt == 'V')
442 exit(0);
Damien Miller95def091999-11-25 00:26:21 +1100443 break;
Damien Millerd27b9472005-12-13 19:29:02 +1100444 case 'w':
Damien Miller7b58e802005-12-13 19:33:19 +1100445 if (options.tun_open == -1)
446 options.tun_open = SSH_TUNMODE_DEFAULT;
Damien Millerd27b9472005-12-13 19:29:02 +1100447 options.tun_local = a2tun(optarg, &options.tun_remote);
Damien Miller7b58e802005-12-13 19:33:19 +1100448 if (options.tun_local == SSH_TUNID_ERR) {
Darren Tuckerd6173c02008-06-13 04:52:53 +1000449 fprintf(stderr,
450 "Bad tun device '%s'\n", optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100451 exit(255);
Damien Millerd27b9472005-12-13 19:29:02 +1100452 }
453 break;
Darren Tucker7ad8dd22010-01-12 19:40:27 +1100454 case 'W':
Damien Millere1537f92010-01-26 13:26:22 +1100455 if (stdio_forward_host != NULL)
456 fatal("stdio forward already specified");
457 if (muxclient_command != 0)
458 fatal("Cannot specify stdio forward with -O");
Darren Tucker7ad8dd22010-01-12 19:40:27 +1100459 if (parse_forward(&fwd, optarg, 1, 0)) {
460 stdio_forward_host = fwd.listen_host;
461 stdio_forward_port = fwd.listen_port;
462 xfree(fwd.connect_host);
463 } else {
464 fprintf(stderr,
465 "Bad stdio forwarding specification '%s'\n",
466 optarg);
467 exit(255);
468 }
Damien Miller21771e22011-05-15 08:45:50 +1000469 options.request_tty = REQUEST_TTY_NO;
Darren Tucker7ad8dd22010-01-12 19:40:27 +1100470 no_shell_flag = 1;
471 options.clear_forwardings = 1;
472 options.exit_on_forward_failure = 1;
473 break;
Damien Miller95def091999-11-25 00:26:21 +1100474 case 'q':
475 options.log_level = SYSLOG_LEVEL_QUIET;
476 break;
Damien Miller95def091999-11-25 00:26:21 +1100477 case 'e':
478 if (optarg[0] == '^' && optarg[2] == 0 &&
Damien Millerf4614452001-07-14 12:18:10 +1000479 (u_char) optarg[1] >= 64 &&
480 (u_char) optarg[1] < 128)
Ben Lindstrom46c16222000-12-22 01:43:59 +0000481 options.escape_char = (u_char) optarg[1] & 31;
Damien Miller95def091999-11-25 00:26:21 +1100482 else if (strlen(optarg) == 1)
Ben Lindstrom46c16222000-12-22 01:43:59 +0000483 options.escape_char = (u_char) optarg[0];
Damien Miller95def091999-11-25 00:26:21 +1100484 else if (strcmp(optarg, "none") == 0)
Ben Lindstrom2b1f71b2001-06-05 20:32:21 +0000485 options.escape_char = SSH_ESCAPECHAR_NONE;
Damien Miller95def091999-11-25 00:26:21 +1100486 else {
Damien Millerf4614452001-07-14 12:18:10 +1000487 fprintf(stderr, "Bad escape character '%s'.\n",
488 optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100489 exit(255);
Damien Miller95def091999-11-25 00:26:21 +1100490 }
491 break;
Damien Miller95def091999-11-25 00:26:21 +1100492 case 'c':
Damien Millereba71ba2000-04-29 23:57:08 +1000493 if (ciphers_valid(optarg)) {
494 /* SSH2 only */
495 options.ciphers = xstrdup(optarg);
Darren Tucker5cb30ad2004-08-12 22:40:24 +1000496 options.cipher = SSH_CIPHER_INVALID;
Damien Millereba71ba2000-04-29 23:57:08 +1000497 } else {
498 /* SSH1 only */
Damien Millere39cacc2000-11-29 12:18:44 +1100499 options.cipher = cipher_number(optarg);
500 if (options.cipher == -1) {
Damien Millerf4614452001-07-14 12:18:10 +1000501 fprintf(stderr,
502 "Unknown cipher type '%s'\n",
503 optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100504 exit(255);
Damien Millereba71ba2000-04-29 23:57:08 +1000505 }
Damien Millerf4614452001-07-14 12:18:10 +1000506 if (options.cipher == SSH_CIPHER_3DES)
Damien Millere39cacc2000-11-29 12:18:44 +1100507 options.ciphers = "3des-cbc";
Damien Millerf4614452001-07-14 12:18:10 +1000508 else if (options.cipher == SSH_CIPHER_BLOWFISH)
Damien Millere39cacc2000-11-29 12:18:44 +1100509 options.ciphers = "blowfish-cbc";
Damien Millerf4614452001-07-14 12:18:10 +1000510 else
Damien Millere39cacc2000-11-29 12:18:44 +1100511 options.ciphers = (char *)-1;
Damien Miller95def091999-11-25 00:26:21 +1100512 }
513 break;
Ben Lindstrom06b33aa2001-02-15 03:01:59 +0000514 case 'm':
515 if (mac_valid(optarg))
516 options.macs = xstrdup(optarg);
517 else {
Damien Millerf4614452001-07-14 12:18:10 +1000518 fprintf(stderr, "Unknown mac type '%s'\n",
519 optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100520 exit(255);
Ben Lindstrom06b33aa2001-02-15 03:01:59 +0000521 }
522 break;
Damien Miller0e220db2004-06-15 10:34:08 +1000523 case 'M':
Damien Millerd14b1e72005-06-16 13:19:41 +1000524 if (options.control_master == SSHCTL_MASTER_YES)
525 options.control_master = SSHCTL_MASTER_ASK;
526 else
527 options.control_master = SSHCTL_MASTER_YES;
Damien Miller0e220db2004-06-15 10:34:08 +1000528 break;
Damien Miller95def091999-11-25 00:26:21 +1100529 case 'p':
Ben Lindstrom19066a12001-04-12 23:39:26 +0000530 options.port = a2port(optarg);
Damien Miller3dc71ad2009-01-28 16:31:22 +1100531 if (options.port <= 0) {
Ben Lindstrom146edb92001-04-11 23:06:28 +0000532 fprintf(stderr, "Bad port '%s'\n", optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100533 exit(255);
Ben Lindstrom146edb92001-04-11 23:06:28 +0000534 }
Damien Miller95def091999-11-25 00:26:21 +1100535 break;
Damien Miller95def091999-11-25 00:26:21 +1100536 case 'l':
537 options.user = optarg;
538 break;
Ben Lindstrom1a174712001-09-12 17:56:15 +0000539
Damien Miller95def091999-11-25 00:26:21 +1100540 case 'L':
Damien Miller4bf648f2009-02-14 16:28:21 +1100541 if (parse_forward(&fwd, optarg, 0, 0))
Damien Millerf91ee4c2005-03-01 21:24:33 +1100542 add_local_forward(&options, &fwd);
543 else {
Damien Millerf4614452001-07-14 12:18:10 +1000544 fprintf(stderr,
Damien Millerf91ee4c2005-03-01 21:24:33 +1100545 "Bad local forwarding specification '%s'\n",
Damien Millerf4614452001-07-14 12:18:10 +1000546 optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100547 exit(255);
Ben Lindstrom1a174712001-09-12 17:56:15 +0000548 }
Damien Millerf91ee4c2005-03-01 21:24:33 +1100549 break;
550
551 case 'R':
Damien Miller4bf648f2009-02-14 16:28:21 +1100552 if (parse_forward(&fwd, optarg, 0, 1)) {
Damien Millerf91ee4c2005-03-01 21:24:33 +1100553 add_remote_forward(&options, &fwd);
554 } else {
555 fprintf(stderr,
556 "Bad remote forwarding specification "
557 "'%s'\n", optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100558 exit(255);
Damien Millerf91ee4c2005-03-01 21:24:33 +1100559 }
Damien Miller95def091999-11-25 00:26:21 +1100560 break;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000561
562 case 'D':
Damien Miller4bf648f2009-02-14 16:28:21 +1100563 if (parse_forward(&fwd, optarg, 1, 0)) {
Damien Millera699d952008-11-03 19:27:34 +1100564 add_local_forward(&options, &fwd);
Damien Millerf91ee4c2005-03-01 21:24:33 +1100565 } else {
Damien Millera699d952008-11-03 19:27:34 +1100566 fprintf(stderr,
567 "Bad dynamic forwarding specification "
568 "'%s'\n", optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100569 exit(255);
Ben Lindstrom146edb92001-04-11 23:06:28 +0000570 }
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000571 break;
572
Damien Miller95def091999-11-25 00:26:21 +1100573 case 'C':
574 options.compression = 1;
575 break;
Damien Miller1383bd82000-04-06 12:32:37 +1000576 case 'N':
577 no_shell_flag = 1;
Damien Miller21771e22011-05-15 08:45:50 +1000578 options.request_tty = REQUEST_TTY_NO;
Damien Miller1383bd82000-04-06 12:32:37 +1000579 break;
Damien Miller1383bd82000-04-06 12:32:37 +1000580 case 'T':
Damien Miller21771e22011-05-15 08:45:50 +1000581 options.request_tty = REQUEST_TTY_NO;
Damien Miller1383bd82000-04-06 12:32:37 +1000582 break;
Damien Miller95def091999-11-25 00:26:21 +1100583 case 'o':
584 dummy = 1;
Damien Miller9836cf82003-12-17 16:30:06 +1100585 line = xstrdup(optarg);
Damien Millerf4614452001-07-14 12:18:10 +1000586 if (process_config_line(&options, host ? host : "",
Damien Miller9836cf82003-12-17 16:30:06 +1100587 line, "command-line", 0, &dummy) != 0)
Darren Tuckere9a9b712005-12-20 16:15:51 +1100588 exit(255);
Damien Miller9836cf82003-12-17 16:30:06 +1100589 xfree(line);
Damien Miller95def091999-11-25 00:26:21 +1100590 break;
Damien Miller832562e2001-01-30 09:30:01 +1100591 case 's':
592 subsystem_flag = 1;
593 break;
Damien Miller0e220db2004-06-15 10:34:08 +1000594 case 'S':
595 if (options.control_path != NULL)
596 free(options.control_path);
597 options.control_path = xstrdup(optarg);
Damien Miller0e220db2004-06-15 10:34:08 +1000598 break;
Ben Lindstrome0f88042001-04-30 13:06:24 +0000599 case 'b':
600 options.bind_address = optarg;
601 break;
Ben Lindstrom14f31ab2001-09-12 17:48:04 +0000602 case 'F':
603 config = optarg;
604 break;
Damien Miller95def091999-11-25 00:26:21 +1100605 default:
606 usage();
607 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000608 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000609
Damien Millerf4614452001-07-14 12:18:10 +1000610 ac -= optind;
611 av += optind;
612
Darren Tuckerb8c884a2010-01-08 18:53:43 +1100613 if (ac > 0 && !host) {
Ben Lindstromc276c122002-12-23 02:14:51 +0000614 if (strrchr(*av, '@')) {
Damien Millerf4614452001-07-14 12:18:10 +1000615 p = xstrdup(*av);
Ben Lindstromc276c122002-12-23 02:14:51 +0000616 cp = strrchr(p, '@');
Damien Millerf4614452001-07-14 12:18:10 +1000617 if (cp == NULL || cp == p)
618 usage();
619 options.user = p;
620 *cp = '\0';
621 host = ++cp;
622 } else
623 host = *av;
Ben Lindstromb9fa6912002-12-23 02:24:54 +0000624 if (ac > 1) {
625 optind = optreset = 1;
Damien Millerf4614452001-07-14 12:18:10 +1000626 goto again;
627 }
Ben Lindstromb9fa6912002-12-23 02:24:54 +0000628 ac--, av++;
Damien Millerf4614452001-07-14 12:18:10 +1000629 }
630
Damien Miller95def091999-11-25 00:26:21 +1100631 /* Check that we got a host name. */
632 if (!host)
633 usage();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000634
Damien Miller4314c2b2010-09-10 11:12:09 +1000635 OpenSSL_add_all_algorithms();
Damien Miller0bc1bd82000-11-13 22:57:25 +1100636 ERR_load_crypto_strings();
Damien Millercb5e44a2000-09-29 12:12:36 +1100637
Damien Miller95def091999-11-25 00:26:21 +1100638 /* Initialize the command to execute on remote host. */
639 buffer_init(&command);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000640
Damien Miller5428f641999-11-25 11:54:57 +1100641 /*
642 * Save the command to execute on the remote host in a buffer. There
643 * is no limit on the length of the command, except by the maximum
644 * packet size. Also sets the tty flag if there is no command.
645 */
Damien Millerf4614452001-07-14 12:18:10 +1000646 if (!ac) {
Damien Miller95def091999-11-25 00:26:21 +1100647 /* No command specified - execute shell on a tty. */
Damien Miller832562e2001-01-30 09:30:01 +1100648 if (subsystem_flag) {
Damien Millerf4614452001-07-14 12:18:10 +1000649 fprintf(stderr,
650 "You must specify a subsystem to invoke.\n");
Damien Miller832562e2001-01-30 09:30:01 +1100651 usage();
652 }
Damien Miller95def091999-11-25 00:26:21 +1100653 } else {
Damien Millerf4614452001-07-14 12:18:10 +1000654 /* A command has been specified. Store it into the buffer. */
655 for (i = 0; i < ac; i++) {
656 if (i)
Damien Miller95def091999-11-25 00:26:21 +1100657 buffer_append(&command, " ", 1);
658 buffer_append(&command, av[i], strlen(av[i]));
659 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000660 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000661
Damien Miller95def091999-11-25 00:26:21 +1100662 /* Cannot fork to background if no command. */
Darren Tuckerd6173c02008-06-13 04:52:53 +1000663 if (fork_after_authentication_flag && buffer_len(&command) == 0 &&
664 !no_shell_flag)
665 fatal("Cannot fork into background without a command "
666 "to execute.");
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000667
Ben Lindstrom8a432f52001-03-05 07:24:46 +0000668 /*
669 * Initialize "log" output. Since we are the client all output
670 * actually goes to stderr.
671 */
Darren Tucker72efd742009-06-21 17:48:00 +1000672 log_init(argv0,
Darren Tuckerd6173c02008-06-13 04:52:53 +1000673 options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level,
Damien Millere272a5b2008-11-03 19:22:37 +1100674 SYSLOG_FACILITY_USER, !use_syslog);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000675
Ben Lindstrom14f31ab2001-09-12 17:48:04 +0000676 /*
677 * Read per-user configuration file. Ignore the system wide config
678 * file if the user specifies a config file on the command line.
679 */
680 if (config != NULL) {
Damien Miller914420f2004-04-20 20:14:07 +1000681 if (!read_config_file(config, host, &options, 0))
Ben Lindstromedc0cf22001-09-12 18:32:20 +0000682 fatal("Can't open user config file %.100s: "
683 "%.100s", config, strerror(errno));
Damien Miller80163902007-01-05 16:30:16 +1100684 } else {
Darren Tucker199b1342009-07-06 07:16:56 +1000685 r = snprintf(buf, sizeof buf, "%s/%s", pw->pw_dir,
Ben Lindstrom14f31ab2001-09-12 17:48:04 +0000686 _PATH_SSH_USER_CONFFILE);
Darren Tucker199b1342009-07-06 07:16:56 +1000687 if (r > 0 && (size_t)r < sizeof(buf))
688 (void)read_config_file(buf, host, &options, 1);
Ben Lindstrom83f07d12001-10-03 17:22:29 +0000689
Damien Miller765f8c42011-08-06 06:18:16 +1000690 /* Read systemwide configuration file after user config. */
Darren Tuckerfc959702004-07-17 16:12:08 +1000691 (void)read_config_file(_PATH_HOST_CONFIG_FILE, host,
Damien Miller57a44762004-04-20 20:11:57 +1000692 &options, 0);
Ben Lindstrom14f31ab2001-09-12 17:48:04 +0000693 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000694
Damien Miller95def091999-11-25 00:26:21 +1100695 /* Fill configuration defaults. */
696 fill_default_options(&options);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000697
Darren Tucker0a4f04b2003-07-03 20:37:47 +1000698 channel_set_af(options.address_family);
699
Damien Miller95def091999-11-25 00:26:21 +1100700 /* reinit */
Darren Tucker72efd742009-06-21 17:48:00 +1000701 log_init(argv0, options.log_level, SYSLOG_FACILITY_USER, !use_syslog);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000702
Damien Millerfff9f092012-07-06 13:45:01 +1000703 if (options.request_tty == REQUEST_TTY_YES ||
704 options.request_tty == REQUEST_TTY_FORCE)
705 tty_flag = 1;
706
707 /* Allocate a tty by default if no command specified. */
708 if (buffer_len(&command) == 0)
709 tty_flag = options.request_tty != REQUEST_TTY_NO;
710
711 /* Force no tty */
712 if (options.request_tty == REQUEST_TTY_NO || muxclient_command != 0)
713 tty_flag = 0;
714 /* Do not allocate a tty if stdin is not a tty. */
715 if ((!isatty(fileno(stdin)) || stdin_null_flag) &&
716 options.request_tty != REQUEST_TTY_FORCE) {
717 if (tty_flag)
718 logit("Pseudo-terminal will not be allocated because "
719 "stdin is not a terminal.");
720 tty_flag = 0;
721 }
722
Damien Miller60bc5172001-03-19 09:38:15 +1100723 seed_rng();
724
Damien Miller95def091999-11-25 00:26:21 +1100725 if (options.user == NULL)
726 options.user = xstrdup(pw->pw_name);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000727
Darren Tuckerf6b01b72008-06-13 04:56:37 +1000728 /* Get default port if port has not been set. */
729 if (options.port == 0) {
730 sp = getservbyname(SSH_SERVICE_NAME, "tcp");
731 options.port = sp ? ntohs(sp->s_port) : SSH_DEFAULT_PORT;
732 }
733
Damien Miller83f8a402011-01-07 09:51:17 +1100734 /* preserve host name given on command line for %n expansion */
735 host_arg = host;
Damien Millerd0244d42010-07-16 13:56:43 +1000736 if (options.hostname != NULL) {
737 host = percent_expand(options.hostname,
738 "h", host, (char *)NULL);
739 }
740
Damien Millerdfc85fa2011-05-15 08:44:02 +1000741 if (gethostname(thishost, sizeof(thishost)) == -1)
742 fatal("gethostname: %s", strerror(errno));
743 strlcpy(shorthost, thishost, sizeof(shorthost));
744 shorthost[strcspn(thishost, ".")] = '\0';
745 snprintf(portstr, sizeof(portstr), "%d", options.port);
Darren Tuckerf6b01b72008-06-13 04:56:37 +1000746
Damien Millerdfc85fa2011-05-15 08:44:02 +1000747 if (options.local_command != NULL) {
Darren Tuckerf6b01b72008-06-13 04:56:37 +1000748 debug3("expanding LocalCommand: %s", options.local_command);
749 cp = options.local_command;
750 options.local_command = percent_expand(cp, "d", pw->pw_dir,
Damien Miller83f8a402011-01-07 09:51:17 +1100751 "h", host, "l", thishost, "n", host_arg, "r", options.user,
Damien Millerdfc85fa2011-05-15 08:44:02 +1000752 "p", portstr, "u", pw->pw_name, "L", shorthost,
753 (char *)NULL);
Darren Tuckerf6b01b72008-06-13 04:56:37 +1000754 debug3("expanded LocalCommand: %s", options.local_command);
755 xfree(cp);
756 }
757
Darren Tucker3f521e22003-07-03 16:20:42 +1000758 /* force lowercase for hostkey matching */
759 if (options.host_key_alias != NULL) {
760 for (p = options.host_key_alias; *p; p++)
761 if (isupper(*p))
Damien Miller1d2b6702006-03-26 14:09:54 +1100762 *p = (char)tolower(*p);
Darren Tucker3f521e22003-07-03 16:20:42 +1000763 }
764
Damien Miller9f1e33a2003-02-24 11:57:32 +1100765 if (options.proxy_command != NULL &&
Darren Tucker32e42c72007-12-02 23:01:03 +1100766 strcmp(options.proxy_command, "none") == 0) {
767 xfree(options.proxy_command);
Damien Miller9f1e33a2003-02-24 11:57:32 +1100768 options.proxy_command = NULL;
Darren Tucker32e42c72007-12-02 23:01:03 +1100769 }
Damien Miller8f74c8f2005-06-26 08:56:03 +1000770 if (options.control_path != NULL &&
Darren Tucker32e42c72007-12-02 23:01:03 +1100771 strcmp(options.control_path, "none") == 0) {
772 xfree(options.control_path);
Damien Miller8f74c8f2005-06-26 08:56:03 +1000773 options.control_path = NULL;
Darren Tucker32e42c72007-12-02 23:01:03 +1100774 }
Damien Miller9f1e33a2003-02-24 11:57:32 +1100775
Damien Miller0e220db2004-06-15 10:34:08 +1000776 if (options.control_path != NULL) {
Damien Miller6476cad2005-06-16 13:18:34 +1000777 cp = tilde_expand_filename(options.control_path,
778 original_real_uid);
Darren Tucker32e42c72007-12-02 23:01:03 +1100779 xfree(options.control_path);
Damien Millerdfc85fa2011-05-15 08:44:02 +1000780 options.control_path = percent_expand(cp, "h", host,
781 "l", thishost, "n", host_arg, "r", options.user,
782 "p", portstr, "u", pw->pw_name, "L", shorthost,
783 (char *)NULL);
Damien Miller6476cad2005-06-16 13:18:34 +1000784 xfree(cp);
Damien Miller0e220db2004-06-15 10:34:08 +1000785 }
Damien Millerb1cbfa22008-05-19 16:00:08 +1000786 if (muxclient_command != 0 && options.control_path == NULL)
Darren Tucker0814d312005-06-01 23:08:51 +1000787 fatal("No ControlPath specified for \"-O\" command");
Damien Millerd14b1e72005-06-16 13:19:41 +1000788 if (options.control_path != NULL)
Damien Millerb1cbfa22008-05-19 16:00:08 +1000789 muxclient(options.control_path);
Damien Miller0e220db2004-06-15 10:34:08 +1000790
Damien Miller67bd0622007-09-17 12:06:57 +1000791 timeout_ms = options.connection_timeout * 1000;
792
Kevin Stevesfcec7f82000-12-15 19:55:48 +0000793 /* Open a connection to the remote host. */
Darren Tucker0a4f04b2003-07-03 20:37:47 +1000794 if (ssh_connect(host, &hostaddr, options.port,
Damien Miller67bd0622007-09-17 12:06:57 +1000795 options.address_family, options.connection_attempts, &timeout_ms,
796 options.tcp_keep_alive,
Ben Lindstrom1aa64272002-06-11 20:28:05 +0000797#ifdef HAVE_CYGWIN
798 options.use_privileged_port,
799#else
Ben Lindstromf9c48842002-06-11 16:37:51 +0000800 original_effective_uid == 0 && options.use_privileged_port,
Ben Lindstrom1aa64272002-06-11 20:28:05 +0000801#endif
Ben Lindstromda394ca2002-06-12 16:11:12 +0000802 options.proxy_command) != 0)
Darren Tuckere9a9b712005-12-20 16:15:51 +1100803 exit(255);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000804
Damien Miller67bd0622007-09-17 12:06:57 +1000805 if (timeout_ms > 0)
806 debug3("timeout: %d ms remain after connect", timeout_ms);
807
Damien Miller5428f641999-11-25 11:54:57 +1100808 /*
809 * If we successfully made the connection, load the host private key
810 * in case we will need it later for combined rsa-rhosts
811 * authentication. This must be done before releasing extra
812 * privileges, because the file is only readable by root.
Ben Lindstrom9e5bb572002-06-06 19:58:27 +0000813 * If we cannot access the private keys, load the public keys
814 * instead and try to execute the ssh-keysign helper instead.
Damien Miller5428f641999-11-25 11:54:57 +1100815 */
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000816 sensitive_data.nkeys = 0;
817 sensitive_data.keys = NULL;
Ben Lindstrom1bad2562002-06-06 19:57:33 +0000818 sensitive_data.external_keysign = 0;
Ben Lindstrom24157572002-06-12 16:09:39 +0000819 if (options.rhosts_rsa_authentication ||
820 options.hostbased_authentication) {
Damien Millereb8b60e2010-08-31 22:41:14 +1000821 sensitive_data.nkeys = 7;
Damien Millerddd63ab2006-03-31 23:10:51 +1100822 sensitive_data.keys = xcalloc(sensitive_data.nkeys,
Ben Lindstroma962c2f2002-07-04 00:14:17 +0000823 sizeof(Key));
Damien Miller6af914a2010-09-10 11:39:26 +1000824 for (i = 0; i < sensitive_data.nkeys; i++)
825 sensitive_data.keys[i] = NULL;
Ben Lindstromf9c48842002-06-11 16:37:51 +0000826
827 PRIV_START;
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000828 sensitive_data.keys[0] = key_load_private_type(KEY_RSA1,
Darren Tucker232b76f2006-05-06 17:41:51 +1000829 _PATH_HOST_KEY_FILE, "", NULL, NULL);
Damien Millerc1583312010-08-05 13:04:50 +1000830 sensitive_data.keys[1] = key_load_private_cert(KEY_DSA,
831 _PATH_HOST_DSA_KEY_FILE, "", NULL);
Damien Miller6af914a2010-09-10 11:39:26 +1000832#ifdef OPENSSL_HAS_ECC
Damien Millereb8b60e2010-08-31 22:41:14 +1000833 sensitive_data.keys[2] = key_load_private_cert(KEY_ECDSA,
834 _PATH_HOST_ECDSA_KEY_FILE, "", NULL);
Damien Miller6af914a2010-09-10 11:39:26 +1000835#endif
Damien Millereb8b60e2010-08-31 22:41:14 +1000836 sensitive_data.keys[3] = key_load_private_cert(KEY_RSA,
Damien Millerc1583312010-08-05 13:04:50 +1000837 _PATH_HOST_RSA_KEY_FILE, "", NULL);
Damien Millereb8b60e2010-08-31 22:41:14 +1000838 sensitive_data.keys[4] = key_load_private_type(KEY_DSA,
Darren Tucker232b76f2006-05-06 17:41:51 +1000839 _PATH_HOST_DSA_KEY_FILE, "", NULL, NULL);
Damien Miller6af914a2010-09-10 11:39:26 +1000840#ifdef OPENSSL_HAS_ECC
Damien Millereb8b60e2010-08-31 22:41:14 +1000841 sensitive_data.keys[5] = key_load_private_type(KEY_ECDSA,
842 _PATH_HOST_ECDSA_KEY_FILE, "", NULL, NULL);
Damien Miller6af914a2010-09-10 11:39:26 +1000843#endif
Damien Millereb8b60e2010-08-31 22:41:14 +1000844 sensitive_data.keys[6] = key_load_private_type(KEY_RSA,
Darren Tucker232b76f2006-05-06 17:41:51 +1000845 _PATH_HOST_RSA_KEY_FILE, "", NULL, NULL);
Ben Lindstromf9c48842002-06-11 16:37:51 +0000846 PRIV_END;
Ben Lindstrom1bad2562002-06-06 19:57:33 +0000847
Ben Lindstrom5d35a2f2002-07-04 00:19:40 +0000848 if (options.hostbased_authentication == 1 &&
849 sensitive_data.keys[0] == NULL &&
Damien Millereb8b60e2010-08-31 22:41:14 +1000850 sensitive_data.keys[4] == NULL &&
851 sensitive_data.keys[5] == NULL &&
852 sensitive_data.keys[6] == NULL) {
Damien Millerc1583312010-08-05 13:04:50 +1000853 sensitive_data.keys[1] = key_load_cert(
854 _PATH_HOST_DSA_KEY_FILE);
Damien Miller6af914a2010-09-10 11:39:26 +1000855#ifdef OPENSSL_HAS_ECC
Damien Millerc1583312010-08-05 13:04:50 +1000856 sensitive_data.keys[2] = key_load_cert(
Damien Millereb8b60e2010-08-31 22:41:14 +1000857 _PATH_HOST_ECDSA_KEY_FILE);
Damien Miller6af914a2010-09-10 11:39:26 +1000858#endif
Damien Millereb8b60e2010-08-31 22:41:14 +1000859 sensitive_data.keys[3] = key_load_cert(
Damien Millerc1583312010-08-05 13:04:50 +1000860 _PATH_HOST_RSA_KEY_FILE);
Damien Millerc1583312010-08-05 13:04:50 +1000861 sensitive_data.keys[4] = key_load_public(
Damien Millereb8b60e2010-08-31 22:41:14 +1000862 _PATH_HOST_DSA_KEY_FILE, NULL);
Damien Miller6af914a2010-09-10 11:39:26 +1000863#ifdef OPENSSL_HAS_ECC
Damien Millereb8b60e2010-08-31 22:41:14 +1000864 sensitive_data.keys[5] = key_load_public(
865 _PATH_HOST_ECDSA_KEY_FILE, NULL);
Damien Miller6af914a2010-09-10 11:39:26 +1000866#endif
Damien Millereb8b60e2010-08-31 22:41:14 +1000867 sensitive_data.keys[6] = key_load_public(
Ben Lindstrom1bad2562002-06-06 19:57:33 +0000868 _PATH_HOST_RSA_KEY_FILE, NULL);
869 sensitive_data.external_keysign = 1;
870 }
Damien Miller95def091999-11-25 00:26:21 +1100871 }
Damien Miller5428f641999-11-25 11:54:57 +1100872 /*
873 * Get rid of any extra privileges that we may have. We will no
874 * longer need them. Also, extra privileges could make it very hard
875 * to read identity files and other non-world-readable files from the
876 * user's home directory if it happens to be on a NFS volume where
877 * root is mapped to nobody.
878 */
Darren Tucker25f60a72004-08-15 17:23:34 +1000879 if (original_effective_uid == 0) {
880 PRIV_START;
881 permanently_set_uid(pw);
882 }
Damien Miller95def091999-11-25 00:26:21 +1100883
Damien Miller5428f641999-11-25 11:54:57 +1100884 /*
885 * Now that we are back to our own permissions, create ~/.ssh
Damien Miller788f2122005-11-05 15:14:59 +1100886 * directory if it doesn't already exist.
Damien Miller5428f641999-11-25 11:54:57 +1100887 */
Darren Tucker45c66d72011-11-04 10:50:40 +1100888 if (config == NULL) {
889 r = snprintf(buf, sizeof buf, "%s%s%s", pw->pw_dir,
890 strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR);
891 if (r > 0 && (size_t)r < sizeof(buf) && stat(buf, &st) < 0) {
Darren Tucker8ccb7392010-09-10 12:28:24 +1000892#ifdef WITH_SELINUX
Darren Tucker45c66d72011-11-04 10:50:40 +1100893 ssh_selinux_setfscreatecon(buf);
Darren Tucker8ccb7392010-09-10 12:28:24 +1000894#endif
Darren Tucker45c66d72011-11-04 10:50:40 +1100895 if (mkdir(buf, 0700) < 0)
896 error("Could not create directory '%.200s'.",
897 buf);
Darren Tucker8ccb7392010-09-10 12:28:24 +1000898#ifdef WITH_SELINUX
Darren Tucker45c66d72011-11-04 10:50:40 +1100899 ssh_selinux_setfscreatecon(NULL);
Darren Tucker8ccb7392010-09-10 12:28:24 +1000900#endif
Darren Tucker45c66d72011-11-04 10:50:40 +1100901 }
Darren Tucker8ccb7392010-09-10 12:28:24 +1000902 }
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000903 /* load options.identity_files */
904 load_public_identity_files();
905
906 /* Expand ~ in known host file names. */
Damien Miller295ee632011-05-29 21:42:31 +1000907 tilde_expand_paths(options.system_hostfiles,
908 options.num_system_hostfiles);
909 tilde_expand_paths(options.user_hostfiles, options.num_user_hostfiles);
Damien Miller95def091999-11-25 00:26:21 +1100910
Damien Miller07cd5892001-11-12 10:52:03 +1100911 signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
Damien Miller857b02e2010-09-24 22:02:56 +1000912 signal(SIGCHLD, main_sigchld_handler);
Damien Miller07cd5892001-11-12 10:52:03 +1100913
Darren Tuckerd6173c02008-06-13 04:52:53 +1000914 /* Log into the remote system. Never returns if the login fails. */
Damien Miller67bd0622007-09-17 12:06:57 +1000915 ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr,
Damien Millerd925dcd2010-12-01 12:21:51 +1100916 options.port, pw, timeout_ms);
Damien Miller95def091999-11-25 00:26:21 +1100917
Damien Miller383ffe62010-06-26 10:02:03 +1000918 if (packet_connection_is_on_socket()) {
919 verbose("Authenticated to %s ([%s]:%d).", host,
920 get_remote_ipaddr(), get_remote_port());
921 } else {
922 verbose("Authenticated to %s (via proxy).", host);
923 }
924
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000925 /* We no longer need the private host keys. Clear them now. */
926 if (sensitive_data.nkeys != 0) {
927 for (i = 0; i < sensitive_data.nkeys; i++) {
928 if (sensitive_data.keys[i] != NULL) {
929 /* Destroys contents safely */
930 debug3("clear hostkey %d", i);
931 key_free(sensitive_data.keys[i]);
932 sensitive_data.keys[i] = NULL;
933 }
934 }
935 xfree(sensitive_data.keys);
936 }
Ben Lindstroma6c8a8d2001-08-06 21:42:00 +0000937 for (i = 0; i < options.num_identity_files; i++) {
938 if (options.identity_files[i]) {
939 xfree(options.identity_files[i]);
940 options.identity_files[i] = NULL;
941 }
942 if (options.identity_keys[i]) {
943 key_free(options.identity_keys[i]);
944 options.identity_keys[i] = NULL;
945 }
946 }
Damien Miller95def091999-11-25 00:26:21 +1100947
Damien Miller1383bd82000-04-06 12:32:37 +1000948 exit_status = compat20 ? ssh_session2() : ssh_session();
949 packet_close();
Damien Miller8c4e18a2002-09-19 12:05:02 +1000950
Damien Millerb1cbfa22008-05-19 16:00:08 +1000951 if (options.control_path != NULL && muxserver_sock != -1)
Damien Miller0e220db2004-06-15 10:34:08 +1000952 unlink(options.control_path);
953
Damien Millera41ccca2010-10-07 22:07:32 +1100954 /* Kill ProxyCommand if it is running. */
955 ssh_kill_proxy_command();
Damien Miller8c4e18a2002-09-19 12:05:02 +1000956
Damien Miller1383bd82000-04-06 12:32:37 +1000957 return exit_status;
958}
959
Damien Millere11e1ea2010-08-03 16:04:46 +1000960static void
961control_persist_detach(void)
962{
963 pid_t pid;
Damien Miller00d9ae22010-08-17 01:59:31 +1000964 int devnull;
Damien Millere11e1ea2010-08-03 16:04:46 +1000965
966 debug("%s: backgrounding master process", __func__);
967
968 /*
969 * master (current process) into the background, and make the
970 * foreground process a client of the backgrounded master.
971 */
972 switch ((pid = fork())) {
973 case -1:
974 fatal("%s: fork: %s", __func__, strerror(errno));
975 case 0:
976 /* Child: master process continues mainloop */
977 break;
978 default:
979 /* Parent: set up mux slave to connect to backgrounded master */
980 debug2("%s: background process is %ld", __func__, (long)pid);
981 stdin_null_flag = ostdin_null_flag;
Damien Miller21771e22011-05-15 08:45:50 +1000982 options.request_tty = orequest_tty;
Damien Millere11e1ea2010-08-03 16:04:46 +1000983 tty_flag = otty_flag;
984 close(muxserver_sock);
985 muxserver_sock = -1;
Damien Miller5929c522010-09-10 11:17:02 +1000986 options.control_master = SSHCTL_MASTER_NO;
Damien Millere11e1ea2010-08-03 16:04:46 +1000987 muxclient(options.control_path);
988 /* muxclient() doesn't return on success. */
989 fatal("Failed to connect to new control master");
990 }
Damien Miller00d9ae22010-08-17 01:59:31 +1000991 if ((devnull = open(_PATH_DEVNULL, O_RDWR)) == -1) {
992 error("%s: open(\"/dev/null\"): %s", __func__,
993 strerror(errno));
994 } else {
995 if (dup2(devnull, STDIN_FILENO) == -1 ||
996 dup2(devnull, STDOUT_FILENO) == -1)
997 error("%s: dup2: %s", __func__, strerror(errno));
998 if (devnull > STDERR_FILENO)
999 close(devnull);
1000 }
Damien Millerea2c1a42011-06-03 12:10:22 +10001001 setproctitle("%s [mux]", options.control_path);
Damien Millere11e1ea2010-08-03 16:04:46 +10001002}
1003
1004/* Do fork() after authentication. Used by "ssh -f" */
1005static void
1006fork_postauth(void)
1007{
1008 if (need_controlpersist_detach)
1009 control_persist_detach();
1010 debug("forking to background");
1011 fork_after_authentication_flag = 0;
1012 if (daemon(1, 1) < 0)
1013 fatal("daemon() failed: %.200s", strerror(errno));
1014}
1015
Darren Tucker9f407c42008-06-13 04:50:27 +10001016/* Callback for remote forward global requests */
1017static void
1018ssh_confirm_remote_forward(int type, u_int32_t seq, void *ctxt)
1019{
1020 Forward *rfwd = (Forward *)ctxt;
1021
Damien Miller4bf648f2009-02-14 16:28:21 +11001022 /* XXX verbose() on failure? */
Darren Tucker9f407c42008-06-13 04:50:27 +10001023 debug("remote forward %s for: listen %d, connect %s:%d",
1024 type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
1025 rfwd->listen_port, rfwd->connect_host, rfwd->connect_port);
Darren Tucker68afb8c2011-10-02 18:59:03 +11001026 if (rfwd->listen_port == 0) {
1027 if (type == SSH2_MSG_REQUEST_SUCCESS) {
1028 rfwd->allocated_port = packet_get_int();
1029 logit("Allocated port %u for remote forward to %s:%d",
1030 rfwd->allocated_port,
1031 rfwd->connect_host, rfwd->connect_port);
1032 channel_update_permitted_opens(rfwd->handle,
1033 rfwd->allocated_port);
1034 } else {
1035 channel_update_permitted_opens(rfwd->handle, -1);
1036 }
Damien Miller4bf648f2009-02-14 16:28:21 +11001037 }
1038
Darren Tucker9f407c42008-06-13 04:50:27 +10001039 if (type == SSH2_MSG_REQUEST_FAILURE) {
1040 if (options.exit_on_forward_failure)
1041 fatal("Error: remote port forwarding failed for "
1042 "listen port %d", rfwd->listen_port);
1043 else
1044 logit("Warning: remote port forwarding failed for "
1045 "listen port %d", rfwd->listen_port);
1046 }
Darren Tucker9a2a6092008-07-04 12:53:50 +10001047 if (++remote_forward_confirms_received == options.num_remote_forwards) {
Darren Tucker9f407c42008-06-13 04:50:27 +10001048 debug("All remote forwarding requests processed");
Damien Millere11e1ea2010-08-03 16:04:46 +10001049 if (fork_after_authentication_flag)
1050 fork_postauth();
Darren Tucker9a2a6092008-07-04 12:53:50 +10001051 }
Darren Tucker9f407c42008-06-13 04:50:27 +10001052}
1053
Ben Lindstrombba81212001-06-25 05:01:22 +00001054static void
Darren Tucker7ad8dd22010-01-12 19:40:27 +11001055client_cleanup_stdio_fwd(int id, void *arg)
1056{
1057 debug("stdio forwarding: done");
1058 cleanup_exit(0);
1059}
1060
Darren Tucker2d6665d2011-11-04 10:54:22 +11001061static void
1062ssh_init_stdio_forwarding(void)
Darren Tucker7ad8dd22010-01-12 19:40:27 +11001063{
1064 Channel *c;
Damien Millere1537f92010-01-26 13:26:22 +11001065 int in, out;
Darren Tucker7ad8dd22010-01-12 19:40:27 +11001066
Darren Tucker2d6665d2011-11-04 10:54:22 +11001067 if (stdio_forward_host == NULL)
1068 return;
1069 if (!compat20)
1070 fatal("stdio forwarding require Protocol 2");
Damien Millere1537f92010-01-26 13:26:22 +11001071
Darren Tucker2d6665d2011-11-04 10:54:22 +11001072 debug3("%s: %s:%d", __func__, stdio_forward_host, stdio_forward_port);
1073
1074 if ((in = dup(STDIN_FILENO)) < 0 ||
1075 (out = dup(STDOUT_FILENO)) < 0)
Damien Millere1537f92010-01-26 13:26:22 +11001076 fatal("channel_connect_stdio_fwd: dup() in/out failed");
Darren Tucker2d6665d2011-11-04 10:54:22 +11001077 if ((c = channel_connect_stdio_fwd(stdio_forward_host,
1078 stdio_forward_port, in, out)) == NULL)
1079 fatal("%s: channel_connect_stdio_fwd failed", __func__);
Darren Tucker7ad8dd22010-01-12 19:40:27 +11001080 channel_register_cleanup(c->self, client_cleanup_stdio_fwd, 0);
Darren Tucker7ad8dd22010-01-12 19:40:27 +11001081}
1082
1083static void
Damien Miller0bc1bd82000-11-13 22:57:25 +11001084ssh_init_forwarding(void)
1085{
Kevin Steves12057502001-02-05 14:54:34 +00001086 int success = 0;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001087 int i;
Kevin Steves12057502001-02-05 14:54:34 +00001088
Damien Miller0bc1bd82000-11-13 22:57:25 +11001089 /* Initiate local TCP/IP port forwardings. */
1090 for (i = 0; i < options.num_local_forwards; i++) {
Damien Millerf91ee4c2005-03-01 21:24:33 +11001091 debug("Local connections to %.200s:%d forwarded to remote "
1092 "address %.200s:%d",
Darren Tucker47eede72005-03-14 23:08:12 +11001093 (options.local_forwards[i].listen_host == NULL) ?
1094 (options.gateway_ports ? "*" : "LOCALHOST") :
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 Millerb16461c2002-01-22 23:29:22 +11001099 success += channel_setup_local_fwd_listener(
Damien Millerf91ee4c2005-03-01 21:24:33 +11001100 options.local_forwards[i].listen_host,
1101 options.local_forwards[i].listen_port,
1102 options.local_forwards[i].connect_host,
1103 options.local_forwards[i].connect_port,
Damien Miller0bc1bd82000-11-13 22:57:25 +11001104 options.gateway_ports);
1105 }
Darren Tuckere7d4b192006-07-12 22:17:10 +10001106 if (i > 0 && success != i && options.exit_on_forward_failure)
1107 fatal("Could not request local forwarding.");
Kevin Steves12057502001-02-05 14:54:34 +00001108 if (i > 0 && success == 0)
1109 error("Could not request local forwarding.");
Damien Miller0bc1bd82000-11-13 22:57:25 +11001110
1111 /* Initiate remote TCP/IP port forwardings. */
1112 for (i = 0; i < options.num_remote_forwards; i++) {
Damien Millerf91ee4c2005-03-01 21:24:33 +11001113 debug("Remote connections from %.200s:%d forwarded to "
1114 "local address %.200s:%d",
Damien Miller46d38de2005-07-17 17:02:09 +10001115 (options.remote_forwards[i].listen_host == NULL) ?
Damien Milleraa3bb102005-11-05 15:12:59 +11001116 "LOCALHOST" : options.remote_forwards[i].listen_host,
Damien Millerf91ee4c2005-03-01 21:24:33 +11001117 options.remote_forwards[i].listen_port,
1118 options.remote_forwards[i].connect_host,
1119 options.remote_forwards[i].connect_port);
Darren Tucker68afb8c2011-10-02 18:59:03 +11001120 options.remote_forwards[i].handle =
1121 channel_request_remote_forwarding(
Damien Millerf91ee4c2005-03-01 21:24:33 +11001122 options.remote_forwards[i].listen_host,
1123 options.remote_forwards[i].listen_port,
1124 options.remote_forwards[i].connect_host,
Darren Tucker68afb8c2011-10-02 18:59:03 +11001125 options.remote_forwards[i].connect_port);
1126 if (options.remote_forwards[i].handle < 0) {
Darren Tuckere7d4b192006-07-12 22:17:10 +10001127 if (options.exit_on_forward_failure)
1128 fatal("Could not request remote forwarding.");
1129 else
1130 logit("Warning: Could not request remote "
1131 "forwarding.");
Darren Tucker68afb8c2011-10-02 18:59:03 +11001132 } else {
1133 client_register_global_confirm(ssh_confirm_remote_forward,
1134 &options.remote_forwards[i]);
Darren Tuckere7d4b192006-07-12 22:17:10 +10001135 }
Damien Miller0bc1bd82000-11-13 22:57:25 +11001136 }
Damien Millerb3ce9fe2007-08-08 14:32:41 +10001137
1138 /* Initiate tunnel forwarding. */
1139 if (options.tun_open != SSH_TUNMODE_NO) {
1140 if (client_request_tun_fwd(options.tun_open,
1141 options.tun_local, options.tun_remote) == -1) {
1142 if (options.exit_on_forward_failure)
1143 fatal("Could not request tunnel forwarding.");
1144 else
1145 error("Could not request tunnel forwarding.");
1146 }
1147 }
Damien Miller0bc1bd82000-11-13 22:57:25 +11001148}
1149
Ben Lindstrombba81212001-06-25 05:01:22 +00001150static void
Damien Miller0bc1bd82000-11-13 22:57:25 +11001151check_agent_present(void)
1152{
1153 if (options.forward_agent) {
Damien Miller788f2122005-11-05 15:14:59 +11001154 /* Clear agent forwarding if we don't have an agent. */
Damien Miller789e95d2002-09-12 09:52:46 +10001155 if (!ssh_agent_present())
Damien Miller0bc1bd82000-11-13 22:57:25 +11001156 options.forward_agent = 0;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001157 }
1158}
1159
Ben Lindstrombba81212001-06-25 05:01:22 +00001160static int
Damien Miller1383bd82000-04-06 12:32:37 +10001161ssh_session(void)
1162{
1163 int type;
Damien Miller1383bd82000-04-06 12:32:37 +10001164 int interactive = 0;
1165 int have_tty = 0;
1166 struct winsize ws;
Damien Miller1383bd82000-04-06 12:32:37 +10001167 char *cp;
Damien Miller17e7ed02005-06-17 12:54:33 +10001168 const char *display;
Damien Miller1383bd82000-04-06 12:32:37 +10001169
Damien Miller95def091999-11-25 00:26:21 +11001170 /* Enable compression if requested. */
1171 if (options.compression) {
Darren Tuckerd6173c02008-06-13 04:52:53 +10001172 debug("Requesting compression at level %d.",
1173 options.compression_level);
Damien Miller95def091999-11-25 00:26:21 +11001174
Darren Tuckerd6173c02008-06-13 04:52:53 +10001175 if (options.compression_level < 1 ||
1176 options.compression_level > 9)
1177 fatal("Compression level must be from 1 (fast) to "
1178 "9 (slow, best).");
Damien Miller95def091999-11-25 00:26:21 +11001179
1180 /* Send the request. */
1181 packet_start(SSH_CMSG_REQUEST_COMPRESSION);
1182 packet_put_int(options.compression_level);
1183 packet_send();
1184 packet_write_wait();
Damien Millerdff50992002-01-22 23:16:32 +11001185 type = packet_read();
Damien Miller95def091999-11-25 00:26:21 +11001186 if (type == SSH_SMSG_SUCCESS)
1187 packet_start_compression(options.compression_level);
1188 else if (type == SSH_SMSG_FAILURE)
Damien Miller996acd22003-04-09 20:59:48 +10001189 logit("Warning: Remote host refused compression.");
Damien Miller95def091999-11-25 00:26:21 +11001190 else
Darren Tuckerd6173c02008-06-13 04:52:53 +10001191 packet_disconnect("Protocol error waiting for "
1192 "compression response.");
Damien Miller95def091999-11-25 00:26:21 +11001193 }
1194 /* Allocate a pseudo tty if appropriate. */
1195 if (tty_flag) {
1196 debug("Requesting pty.");
1197
1198 /* Start the packet. */
1199 packet_start(SSH_CMSG_REQUEST_PTY);
1200
1201 /* Store TERM in the packet. There is no limit on the
1202 length of the string. */
1203 cp = getenv("TERM");
1204 if (!cp)
1205 cp = "";
Ben Lindstrom664408d2001-06-09 01:42:01 +00001206 packet_put_cstring(cp);
Damien Miller95def091999-11-25 00:26:21 +11001207
1208 /* Store window size in the packet. */
1209 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
1210 memset(&ws, 0, sizeof(ws));
Damien Miller71a73672006-03-26 14:04:36 +11001211 packet_put_int((u_int)ws.ws_row);
1212 packet_put_int((u_int)ws.ws_col);
1213 packet_put_int((u_int)ws.ws_xpixel);
1214 packet_put_int((u_int)ws.ws_ypixel);
Damien Miller95def091999-11-25 00:26:21 +11001215
1216 /* Store tty modes in the packet. */
Ben Lindstromae8e2d32001-04-14 23:13:02 +00001217 tty_make_modes(fileno(stdin), NULL);
Damien Miller95def091999-11-25 00:26:21 +11001218
1219 /* Send the packet, and wait for it to leave. */
1220 packet_send();
1221 packet_write_wait();
1222
1223 /* Read response from the server. */
Damien Millerdff50992002-01-22 23:16:32 +11001224 type = packet_read();
Damien Miller450a7a12000-03-26 13:04:51 +10001225 if (type == SSH_SMSG_SUCCESS) {
Damien Miller95def091999-11-25 00:26:21 +11001226 interactive = 1;
Damien Miller1383bd82000-04-06 12:32:37 +10001227 have_tty = 1;
Damien Miller450a7a12000-03-26 13:04:51 +10001228 } else if (type == SSH_SMSG_FAILURE)
Darren Tuckerd6173c02008-06-13 04:52:53 +10001229 logit("Warning: Remote host failed or refused to "
1230 "allocate a pseudo tty.");
Damien Miller95def091999-11-25 00:26:21 +11001231 else
Darren Tuckerd6173c02008-06-13 04:52:53 +10001232 packet_disconnect("Protocol error waiting for pty "
1233 "request response.");
Damien Miller95def091999-11-25 00:26:21 +11001234 }
1235 /* Request X11 forwarding if enabled and DISPLAY is set. */
Damien Miller17e7ed02005-06-17 12:54:33 +10001236 display = getenv("DISPLAY");
1237 if (options.forward_x11 && display != NULL) {
Ben Lindstrom4a4bd712001-12-06 17:45:19 +00001238 char *proto, *data;
Damien Millerbd483e72000-04-30 10:00:53 +10001239 /* Get reasonable local authentication information. */
Damien Miller17e7ed02005-06-17 12:54:33 +10001240 client_x11_get_proto(display, options.xauth_location,
Damien Miller1ab6a512010-06-26 10:02:24 +10001241 options.forward_x11_trusted,
1242 options.forward_x11_timeout,
1243 &proto, &data);
Damien Millerbd483e72000-04-30 10:00:53 +10001244 /* Request forwarding with authentication spoofing. */
Darren Tuckerd6173c02008-06-13 04:52:53 +10001245 debug("Requesting X11 forwarding with authentication "
1246 "spoofing.");
Damien Miller6d7b4372011-06-23 08:31:57 +10001247 x11_request_forwarding_with_spoofing(0, display, proto,
1248 data, 0);
Damien Miller95def091999-11-25 00:26:21 +11001249 /* Read response from the server. */
Damien Millerdff50992002-01-22 23:16:32 +11001250 type = packet_read();
Damien Miller95def091999-11-25 00:26:21 +11001251 if (type == SSH_SMSG_SUCCESS) {
Damien Miller95def091999-11-25 00:26:21 +11001252 interactive = 1;
Damien Millerbd483e72000-04-30 10:00:53 +10001253 } else if (type == SSH_SMSG_FAILURE) {
Damien Miller996acd22003-04-09 20:59:48 +10001254 logit("Warning: Remote host denied X11 forwarding.");
Damien Millerbd483e72000-04-30 10:00:53 +10001255 } else {
Darren Tuckerd6173c02008-06-13 04:52:53 +10001256 packet_disconnect("Protocol error waiting for X11 "
1257 "forwarding");
Damien Millerbd483e72000-04-30 10:00:53 +10001258 }
Damien Miller95def091999-11-25 00:26:21 +11001259 }
1260 /* Tell the packet module whether this is an interactive session. */
Damien Miller0dac6fb2010-11-20 15:19:38 +11001261 packet_set_interactive(interactive,
1262 options.ip_qos_interactive, options.ip_qos_bulk);
Damien Miller95def091999-11-25 00:26:21 +11001263
1264 /* Request authentication agent forwarding if appropriate. */
Damien Miller0bc1bd82000-11-13 22:57:25 +11001265 check_agent_present();
1266
Damien Miller95def091999-11-25 00:26:21 +11001267 if (options.forward_agent) {
1268 debug("Requesting authentication agent forwarding.");
1269 auth_request_forwarding();
1270
1271 /* Read response from the server. */
Damien Millerdff50992002-01-22 23:16:32 +11001272 type = packet_read();
Damien Miller48b03fc2002-01-22 23:11:40 +11001273 packet_check_eom();
Damien Miller95def091999-11-25 00:26:21 +11001274 if (type != SSH_SMSG_SUCCESS)
Damien Miller996acd22003-04-09 20:59:48 +10001275 logit("Warning: Remote host denied authentication agent forwarding.");
Damien Miller95def091999-11-25 00:26:21 +11001276 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001277
Damien Miller0bc1bd82000-11-13 22:57:25 +11001278 /* Initiate port forwardings. */
Darren Tucker2d6665d2011-11-04 10:54:22 +11001279 ssh_init_stdio_forwarding();
Damien Miller0bc1bd82000-11-13 22:57:25 +11001280 ssh_init_forwarding();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001281
Darren Tuckerb776c852007-12-02 23:06:35 +11001282 /* Execute a local command */
1283 if (options.local_command != NULL &&
1284 options.permit_local_command)
1285 ssh_local_cmd(options.local_command);
1286
Darren Tucker9a2a6092008-07-04 12:53:50 +10001287 /*
1288 * If requested and we are not interested in replies to remote
1289 * forwarding requests, then let ssh continue in the background.
1290 */
Damien Millere11e1ea2010-08-03 16:04:46 +10001291 if (fork_after_authentication_flag) {
1292 if (options.exit_on_forward_failure &&
1293 options.num_remote_forwards > 0) {
1294 debug("deferring postauth fork until remote forward "
1295 "confirmation received");
1296 } else
1297 fork_postauth();
Darren Tucker9a2a6092008-07-04 12:53:50 +10001298 }
Damien Miller5428f641999-11-25 11:54:57 +11001299
1300 /*
1301 * If a command was specified on the command line, execute the
1302 * command now. Otherwise request the server to start a shell.
1303 */
Damien Miller95def091999-11-25 00:26:21 +11001304 if (buffer_len(&command) > 0) {
1305 int len = buffer_len(&command);
1306 if (len > 900)
1307 len = 900;
Darren Tuckerd6173c02008-06-13 04:52:53 +10001308 debug("Sending command: %.*s", len,
1309 (u_char *)buffer_ptr(&command));
Damien Miller95def091999-11-25 00:26:21 +11001310 packet_start(SSH_CMSG_EXEC_CMD);
1311 packet_put_string(buffer_ptr(&command), buffer_len(&command));
1312 packet_send();
1313 packet_write_wait();
1314 } else {
1315 debug("Requesting shell.");
1316 packet_start(SSH_CMSG_EXEC_SHELL);
1317 packet_send();
1318 packet_write_wait();
1319 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001320
Damien Miller95def091999-11-25 00:26:21 +11001321 /* Enter the interactive session. */
Ben Lindstrom2b1f71b2001-06-05 20:32:21 +00001322 return client_loop(have_tty, tty_flag ?
1323 options.escape_char : SSH_ESCAPECHAR_NONE, 0);
Damien Miller1383bd82000-04-06 12:32:37 +10001324}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001325
Ben Lindstromf558cf62001-09-20 23:13:49 +00001326/* request pty/x11/agent/tcpfwd/shell for channel */
Ben Lindstrombba81212001-06-25 05:01:22 +00001327static void
Damien Millerd530f5f2010-05-21 14:57:10 +10001328ssh_session2_setup(int id, int success, void *arg)
Damien Miller1383bd82000-04-06 12:32:37 +10001329{
Damien Miller3756dce2004-06-18 01:17:29 +10001330 extern char **environ;
Damien Miller17e7ed02005-06-17 12:54:33 +10001331 const char *display;
Damien Miller0e220db2004-06-15 10:34:08 +10001332 int interactive = tty_flag;
Damien Miller17e7ed02005-06-17 12:54:33 +10001333
Damien Millerd530f5f2010-05-21 14:57:10 +10001334 if (!success)
1335 return; /* No need for error message, channels code sens one */
1336
Damien Miller46d38de2005-07-17 17:02:09 +10001337 display = getenv("DISPLAY");
Damien Miller17e7ed02005-06-17 12:54:33 +10001338 if (options.forward_x11 && display != NULL) {
Ben Lindstrom4a4bd712001-12-06 17:45:19 +00001339 char *proto, *data;
Damien Millerbd483e72000-04-30 10:00:53 +10001340 /* Get reasonable local authentication information. */
Damien Miller17e7ed02005-06-17 12:54:33 +10001341 client_x11_get_proto(display, options.xauth_location,
Damien Miller1ab6a512010-06-26 10:02:24 +10001342 options.forward_x11_trusted,
1343 options.forward_x11_timeout, &proto, &data);
Damien Millerbd483e72000-04-30 10:00:53 +10001344 /* Request forwarding with authentication spoofing. */
Darren Tuckerd6173c02008-06-13 04:52:53 +10001345 debug("Requesting X11 forwarding with authentication "
1346 "spoofing.");
Damien Miller6d7b4372011-06-23 08:31:57 +10001347 x11_request_forwarding_with_spoofing(id, display, proto,
1348 data, 1);
1349 client_expect_confirm(id, "X11 forwarding", CONFIRM_WARN);
1350 /* XXX exit_on_forward_failure */
Ben Lindstrombf555ba2001-01-18 02:04:35 +00001351 interactive = 1;
Damien Millerbd483e72000-04-30 10:00:53 +10001352 }
1353
Damien Miller0bc1bd82000-11-13 22:57:25 +11001354 check_agent_present();
1355 if (options.forward_agent) {
1356 debug("Requesting authentication agent forwarding.");
1357 channel_request_start(id, "auth-agent-req@openssh.com", 0);
1358 packet_send();
1359 }
1360
Darren Tucker7b305012012-07-02 18:55:09 +10001361 /* Tell the packet module whether this is an interactive session. */
1362 packet_set_interactive(interactive,
1363 options.ip_qos_interactive, options.ip_qos_bulk);
1364
Damien Miller0e220db2004-06-15 10:34:08 +10001365 client_session2_setup(id, tty_flag, subsystem_flag, getenv("TERM"),
Damien Miller5771ed72008-05-19 15:35:33 +10001366 NULL, fileno(stdin), &command, environ);
Damien Miller1383bd82000-04-06 12:32:37 +10001367}
1368
Ben Lindstromf558cf62001-09-20 23:13:49 +00001369/* open new channel for a session */
Ben Lindstrombba81212001-06-25 05:01:22 +00001370static int
Ben Lindstromf558cf62001-09-20 23:13:49 +00001371ssh_session2_open(void)
Damien Miller1383bd82000-04-06 12:32:37 +10001372{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001373 Channel *c;
1374 int window, packetmax, in, out, err;
Damien Millerad833b32000-08-23 10:46:23 +10001375
Damien Millercaf6dd62000-08-29 11:33:50 +11001376 if (stdin_null_flag) {
Ben Lindstrom31ca54a2001-02-09 02:11:24 +00001377 in = open(_PATH_DEVNULL, O_RDONLY);
Damien Millercaf6dd62000-08-29 11:33:50 +11001378 } else {
1379 in = dup(STDIN_FILENO);
1380 }
1381 out = dup(STDOUT_FILENO);
1382 err = dup(STDERR_FILENO);
1383
1384 if (in < 0 || out < 0 || err < 0)
1385 fatal("dup() in/out/err failed");
1386
Damien Miller69b69aa2000-10-28 14:19:58 +11001387 /* enable nonblocking unless tty */
1388 if (!isatty(in))
1389 set_nonblock(in);
1390 if (!isatty(out))
1391 set_nonblock(out);
1392 if (!isatty(err))
1393 set_nonblock(err);
1394
Damien Millere4340be2000-09-16 13:29:08 +11001395 window = CHAN_SES_WINDOW_DEFAULT;
1396 packetmax = CHAN_SES_PACKET_DEFAULT;
Damien Miller19a59452002-02-19 15:20:57 +11001397 if (tty_flag) {
1398 window >>= 1;
1399 packetmax >>= 1;
Damien Miller1383bd82000-04-06 12:32:37 +10001400 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001401 c = channel_new(
Damien Miller1383bd82000-04-06 12:32:37 +10001402 "session", SSH_CHANNEL_OPENING, in, out, err,
Damien Millere4340be2000-09-16 13:29:08 +11001403 window, packetmax, CHAN_EXTENDED_WRITE,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10001404 "client-session", /*nonblock*/0);
Damien Miller1383bd82000-04-06 12:32:37 +10001405
Ben Lindstromf558cf62001-09-20 23:13:49 +00001406 debug3("ssh_session2_open: channel_new: %d", c->self);
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001407
Ben Lindstrom5ec26452001-06-09 00:18:51 +00001408 channel_send_open(c->self);
Ben Lindstromf558cf62001-09-20 23:13:49 +00001409 if (!no_shell_flag)
Damien Millerb84886b2008-05-19 15:05:07 +10001410 channel_register_open_confirm(c->self,
1411 ssh_session2_setup, NULL);
Damien Miller1383bd82000-04-06 12:32:37 +10001412
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001413 return c->self;
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001414}
1415
Ben Lindstrombba81212001-06-25 05:01:22 +00001416static int
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001417ssh_session2(void)
1418{
Ben Lindstromf558cf62001-09-20 23:13:49 +00001419 int id = -1;
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001420
1421 /* XXX should be pre-session */
Darren Tucker2d6665d2011-11-04 10:54:22 +11001422 if (!options.control_persist)
1423 ssh_init_stdio_forwarding();
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001424 ssh_init_forwarding();
1425
Damien Millere11e1ea2010-08-03 16:04:46 +10001426 /* Start listening for multiplex clients */
1427 muxserver_listen();
1428
1429 /*
Darren Tucker2d6665d2011-11-04 10:54:22 +11001430 * If we are in control persist mode and have a working mux listen
1431 * socket, then prepare to background ourselves and have a foreground
1432 * client attach as a control slave.
1433 * NB. we must save copies of the flags that we override for
Damien Millere11e1ea2010-08-03 16:04:46 +10001434 * the backgrounding, since we defer attachment of the slave until
1435 * after the connection is fully established (in particular,
1436 * async rfwd replies have been received for ExitOnForwardFailure).
1437 */
1438 if (options.control_persist && muxserver_sock != -1) {
1439 ostdin_null_flag = stdin_null_flag;
1440 ono_shell_flag = no_shell_flag;
Damien Miller21771e22011-05-15 08:45:50 +10001441 orequest_tty = options.request_tty;
Damien Millere11e1ea2010-08-03 16:04:46 +10001442 otty_flag = tty_flag;
1443 stdin_null_flag = 1;
1444 no_shell_flag = 1;
Damien Millere11e1ea2010-08-03 16:04:46 +10001445 tty_flag = 0;
1446 if (!fork_after_authentication_flag)
1447 need_controlpersist_detach = 1;
1448 fork_after_authentication_flag = 1;
1449 }
Darren Tucker2d6665d2011-11-04 10:54:22 +11001450 /*
1451 * ControlPersist mux listen socket setup failed, attempt the
1452 * stdio forward setup that we skipped earlier.
1453 */
1454 if (options.control_persist && muxserver_sock == -1)
1455 ssh_init_stdio_forwarding();
Damien Millere11e1ea2010-08-03 16:04:46 +10001456
Ben Lindstromf558cf62001-09-20 23:13:49 +00001457 if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN))
1458 id = ssh_session2_open();
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001459
Darren Tucker8901fa92008-06-11 09:34:01 +10001460 /* If we don't expect to open a new session, then disallow it */
Damien Miller456e6f02008-11-03 19:20:10 +11001461 if (options.control_master == SSHCTL_MASTER_NO &&
1462 (datafellows & SSH_NEW_OPENSSH)) {
Darren Tucker8901fa92008-06-11 09:34:01 +10001463 debug("Requesting no-more-sessions@openssh.com");
1464 packet_start(SSH2_MSG_GLOBAL_REQUEST);
1465 packet_put_cstring("no-more-sessions@openssh.com");
1466 packet_put_char(0);
1467 packet_send();
1468 }
1469
Damien Millerd27b9472005-12-13 19:29:02 +11001470 /* Execute a local command */
1471 if (options.local_command != NULL &&
1472 options.permit_local_command)
1473 ssh_local_cmd(options.local_command);
1474
Damien Miller1f25ab42010-07-16 13:56:23 +10001475 /*
1476 * If requested and we are not interested in replies to remote
1477 * forwarding requests, then let ssh continue in the background.
1478 */
Damien Millere11e1ea2010-08-03 16:04:46 +10001479 if (fork_after_authentication_flag) {
1480 if (options.exit_on_forward_failure &&
1481 options.num_remote_forwards > 0) {
1482 debug("deferring postauth fork until remote forward "
1483 "confirmation received");
1484 } else
1485 fork_postauth();
Darren Tucker9a2a6092008-07-04 12:53:50 +10001486 }
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001487
Darren Tuckerf1de4e52010-01-08 16:54:59 +11001488 if (options.use_roaming)
1489 request_roaming();
1490
Ben Lindstrom2b1f71b2001-06-05 20:32:21 +00001491 return client_loop(tty_flag, tty_flag ?
1492 options.escape_char : SSH_ESCAPECHAR_NONE, id);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001493}
Damien Miller0bc1bd82000-11-13 22:57:25 +11001494
Ben Lindstrombba81212001-06-25 05:01:22 +00001495static void
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001496load_public_identity_files(void)
1497{
Damien Miller6b1d53c2006-03-31 23:13:21 +11001498 char *filename, *cp, thishost[NI_MAXHOST];
Darren Tuckerb4fbbc62007-12-02 23:16:32 +11001499 char *pwdir = NULL, *pwname = NULL;
Ben Lindstrom711b04a2001-08-06 21:12:42 +00001500 int i = 0;
Ben Lindstrom0936a5b2002-03-26 03:17:42 +00001501 Key *public;
Damien Miller6b1d53c2006-03-31 23:13:21 +11001502 struct passwd *pw;
Damien Miller0a80ca12010-02-27 07:55:05 +11001503 u_int n_ids;
1504 char *identity_files[SSH_MAX_IDENTITY_FILES];
1505 Key *identity_keys[SSH_MAX_IDENTITY_FILES];
Damien Miller7ea845e2010-02-12 09:21:02 +11001506#ifdef ENABLE_PKCS11
Ben Lindstrom0936a5b2002-03-26 03:17:42 +00001507 Key **keys;
Damien Miller7ea845e2010-02-12 09:21:02 +11001508 int nkeys;
Damien Miller0a80ca12010-02-27 07:55:05 +11001509#endif /* PKCS11 */
Ben Lindstrom0936a5b2002-03-26 03:17:42 +00001510
Damien Miller0a80ca12010-02-27 07:55:05 +11001511 n_ids = 0;
1512 bzero(identity_files, sizeof(identity_files));
1513 bzero(identity_keys, sizeof(identity_keys));
1514
1515#ifdef ENABLE_PKCS11
Damien Miller7ea845e2010-02-12 09:21:02 +11001516 if (options.pkcs11_provider != NULL &&
Ben Lindstrom0936a5b2002-03-26 03:17:42 +00001517 options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
Damien Miller7ea845e2010-02-12 09:21:02 +11001518 (pkcs11_init(!options.batch_mode) == 0) &&
1519 (nkeys = pkcs11_add_provider(options.pkcs11_provider, NULL,
1520 &keys)) > 0) {
Damien Miller7ea845e2010-02-12 09:21:02 +11001521 for (i = 0; i < nkeys; i++) {
Damien Miller0a80ca12010-02-27 07:55:05 +11001522 if (n_ids >= SSH_MAX_IDENTITY_FILES) {
1523 key_free(keys[i]);
1524 continue;
1525 }
1526 identity_keys[n_ids] = keys[i];
1527 identity_files[n_ids] =
Damien Miller7ea845e2010-02-12 09:21:02 +11001528 xstrdup(options.pkcs11_provider); /* XXX */
Damien Miller0a80ca12010-02-27 07:55:05 +11001529 n_ids++;
Ben Lindstrom0936a5b2002-03-26 03:17:42 +00001530 }
Ben Lindstrom0936a5b2002-03-26 03:17:42 +00001531 xfree(keys);
Ben Lindstrom711b04a2001-08-06 21:12:42 +00001532 }
Damien Miller7ea845e2010-02-12 09:21:02 +11001533#endif /* ENABLE_PKCS11 */
Damien Miller6b1d53c2006-03-31 23:13:21 +11001534 if ((pw = getpwuid(original_real_uid)) == NULL)
1535 fatal("load_public_identity_files: getpwuid failed");
Darren Tuckere143f062007-12-02 23:21:16 +11001536 pwname = xstrdup(pw->pw_name);
1537 pwdir = xstrdup(pw->pw_dir);
Damien Miller6b1d53c2006-03-31 23:13:21 +11001538 if (gethostname(thishost, sizeof(thishost)) == -1)
1539 fatal("load_public_identity_files: gethostname: %s",
1540 strerror(errno));
Damien Miller0a80ca12010-02-27 07:55:05 +11001541 for (i = 0; i < options.num_identity_files; i++) {
1542 if (n_ids >= SSH_MAX_IDENTITY_FILES) {
1543 xfree(options.identity_files[i]);
1544 continue;
1545 }
Damien Miller6b1d53c2006-03-31 23:13:21 +11001546 cp = tilde_expand_filename(options.identity_files[i],
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001547 original_real_uid);
Darren Tuckerb4fbbc62007-12-02 23:16:32 +11001548 filename = percent_expand(cp, "d", pwdir,
1549 "u", pwname, "l", thishost, "h", host,
Damien Miller6b1d53c2006-03-31 23:13:21 +11001550 "r", options.user, (char *)NULL);
1551 xfree(cp);
Ben Lindstromd0fca422001-03-26 13:44:06 +00001552 public = key_load_public(filename, NULL);
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001553 debug("identity file %s type %d", filename,
1554 public ? public->type : -1);
1555 xfree(options.identity_files[i]);
Damien Miller0a80ca12010-02-27 07:55:05 +11001556 identity_files[n_ids] = filename;
1557 identity_keys[n_ids] = public;
1558
1559 if (++n_ids >= SSH_MAX_IDENTITY_FILES)
1560 continue;
1561
1562 /* Try to add the certificate variant too */
1563 xasprintf(&cp, "%s-cert", filename);
1564 public = key_load_public(cp, NULL);
1565 debug("identity file %s type %d", cp,
1566 public ? public->type : -1);
1567 if (public == NULL) {
1568 xfree(cp);
1569 continue;
1570 }
1571 if (!key_is_cert(public)) {
1572 debug("%s: key %s type %s is not a certificate",
1573 __func__, cp, key_type(public));
1574 key_free(public);
1575 xfree(cp);
1576 continue;
1577 }
1578 identity_keys[n_ids] = public;
1579 /* point to the original path, most likely the private key */
1580 identity_files[n_ids] = xstrdup(filename);
1581 n_ids++;
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001582 }
Damien Miller0a80ca12010-02-27 07:55:05 +11001583 options.num_identity_files = n_ids;
1584 memcpy(options.identity_files, identity_files, sizeof(identity_files));
1585 memcpy(options.identity_keys, identity_keys, sizeof(identity_keys));
1586
Darren Tuckerb4fbbc62007-12-02 23:16:32 +11001587 bzero(pwname, strlen(pwname));
Darren Tuckere143f062007-12-02 23:21:16 +11001588 xfree(pwname);
Darren Tuckerb4fbbc62007-12-02 23:16:32 +11001589 bzero(pwdir, strlen(pwdir));
Darren Tuckere143f062007-12-02 23:21:16 +11001590 xfree(pwdir);
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001591}
Damien Miller857b02e2010-09-24 22:02:56 +10001592
1593static void
1594main_sigchld_handler(int sig)
1595{
1596 int save_errno = errno;
1597 pid_t pid;
1598 int status;
1599
1600 while ((pid = waitpid(-1, &status, WNOHANG)) > 0 ||
1601 (pid < 0 && errno == EINTR))
1602 ;
1603
1604 signal(sig, main_sigchld_handler);
1605 errno = save_errno;
1606}
1607