blob: 82d3ab26bbdccb0d782790992b802222b6dbe419 [file] [log] [blame]
Damien Millerc13c3ee2008-11-03 19:23:28 +11001/* $OpenBSD: ssh.c,v 1.321 2008/10/09 06:54:22 jmc 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>
Damien Millere3b60b52006-07-10 21:08:03 +100051#include <sys/socket.h>
Damien Miller03e20032006-03-15 11:16:59 +110052
Damien Millerc7b06362006-03-15 11:53:45 +110053#include <ctype.h>
Darren Tuckerba724052006-07-12 22:24:22 +100054#include <errno.h>
Damien Miller57cf6382006-07-10 21:13:46 +100055#include <fcntl.h>
Damien Millerb8fe89c2006-07-24 14:51:00 +100056#include <netdb.h>
Damien Miller6645e7a2006-03-15 14:42:54 +110057#ifdef HAVE_PATHS_H
Damien Miller03e20032006-03-15 11:16:59 +110058#include <paths.h>
Damien Miller6645e7a2006-03-15 14:42:54 +110059#endif
Damien Miller9f2abc42006-07-10 20:53:08 +100060#include <pwd.h>
Damien Miller6ff3cad2006-03-15 11:52:09 +110061#include <signal.h>
Damien Millerded319c2006-09-01 15:38:36 +100062#include <stdarg.h>
Damien Miller2d00e632006-07-24 13:53:19 +100063#include <stddef.h>
Damien Millera7a73ee2006-08-05 11:37:59 +100064#include <stdio.h>
Damien Millere7a1e5c2006-08-05 11:34:19 +100065#include <stdlib.h>
Damien Millere3476ed2006-07-24 14:13:33 +100066#include <string.h>
Damien Millere6b3b612006-07-24 14:01:23 +100067#include <unistd.h>
Damien Millereba71ba2000-04-29 23:57:08 +100068
Darren Tucker46aa3e02006-09-02 15:32:40 +100069#include <netinet/in.h>
70#include <arpa/inet.h>
71
Damien Millereba71ba2000-04-29 23:57:08 +100072#include <openssl/evp.h>
Damien Miller0bc1bd82000-11-13 22:57:25 +110073#include <openssl/err.h>
Darren Tuckerbfaaf962008-02-28 19:13:52 +110074#include "openbsd-compat/openssl-compat.h"
Damien Millerb84886b2008-05-19 15:05:07 +100075#include "openbsd-compat/sys-queue.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100076
Damien Millerd7834352006-08-05 12:39:39 +100077#include "xmalloc.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100078#include "ssh.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000079#include "ssh1.h"
Damien Miller1383bd82000-04-06 12:32:37 +100080#include "ssh2.h"
81#include "compat.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000082#include "cipher.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000083#include "packet.h"
84#include "buffer.h"
Ben Lindstromc7637672001-06-09 00:36:26 +000085#include "channels.h"
Damien Millereba71ba2000-04-29 23:57:08 +100086#include "key.h"
Damien Miller994cf142000-07-21 10:19:44 +100087#include "authfd.h"
Damien Millereba71ba2000-04-29 23:57:08 +100088#include "authfile.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000089#include "pathnames.h"
Damien Miller0e220db2004-06-15 10:34:08 +100090#include "dispatch.h"
Ben Lindstrombf555ba2001-01-18 02:04:35 +000091#include "clientloop.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000092#include "log.h"
93#include "readconf.h"
94#include "sshconnect.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000095#include "misc.h"
Ben Lindstrom06b33aa2001-02-15 03:01:59 +000096#include "kex.h"
97#include "mac.h"
Darren Tucker06f2bd82004-05-13 16:06:46 +100098#include "sshpty.h"
Darren Tucker46bc0752004-05-02 22:11:30 +100099#include "match.h"
Damien Miller0e220db2004-06-15 10:34:08 +1000100#include "msg.h"
Darren Tucker25f60a72004-08-15 17:23:34 +1000101#include "uidswap.h"
Damien Millerb7576772006-07-10 20:23:39 +1000102#include "version.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000103
Ben Lindstromc5b68002001-07-04 04:52:03 +0000104#ifdef SMARTCARD
Ben Lindstromc5b68002001-07-04 04:52:03 +0000105#include "scard.h"
Ben Lindstrombcc18082001-08-06 21:59:25 +0000106#endif
Ben Lindstromc5b68002001-07-04 04:52:03 +0000107
Damien Miller3f905871999-11-15 17:10:57 +1100108extern char *__progname;
Damien Miller3f905871999-11-15 17:10:57 +1100109
Darren Tuckerd6173c02008-06-13 04:52:53 +1000110/* Flag indicating whether debug mode is on. May be set on the command line. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000111int debug_flag = 0;
112
Damien Miller78928792000-04-12 20:17:38 +1000113/* Flag indicating whether a tty should be allocated */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000114int tty_flag = 0;
Ben Lindstrom4dccfa52000-12-28 16:40:05 +0000115int no_tty_flag = 0;
116int force_tty_flag = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000117
Damien Miller1383bd82000-04-06 12:32:37 +1000118/* don't exec a shell */
119int no_shell_flag = 0;
Damien Miller1383bd82000-04-06 12:32:37 +1000120
Damien Miller5428f641999-11-25 11:54:57 +1100121/*
122 * Flag indicating that nothing should be read from stdin. This can be set
123 * on the command line.
124 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000125int stdin_null_flag = 0;
126
Damien Miller5428f641999-11-25 11:54:57 +1100127/*
128 * Flag indicating that ssh should fork after authentication. This is useful
Ben Lindstromf666fec2002-06-06 19:51:58 +0000129 * so that the passphrase can be entered manually, and then ssh goes to the
Damien Miller5428f641999-11-25 11:54:57 +1100130 * background.
131 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000132int fork_after_authentication_flag = 0;
133
Damien Miller5428f641999-11-25 11:54:57 +1100134/*
135 * General data structure for command line options and options configurable
136 * in configuration files. See readconf.h.
137 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000138Options options;
139
Ben Lindstrom14f31ab2001-09-12 17:48:04 +0000140/* optional user configfile */
141char *config = NULL;
142
Damien Miller5428f641999-11-25 11:54:57 +1100143/*
144 * Name of the host we are connecting to. This is the name given on the
145 * command line, or the HostName specified for the user-supplied name in a
146 * configuration file.
147 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000148char *host;
149
150/* socket address the host resolves to */
Damien Miller34132e52000-01-14 15:45:46 +1100151struct sockaddr_storage hostaddr;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000152
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000153/* Private host keys. */
Ben Lindstrom1bad2562002-06-06 19:57:33 +0000154Sensitive sensitive_data;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000155
156/* Original real UID. */
157uid_t original_real_uid;
Ben Lindstromf9c48842002-06-11 16:37:51 +0000158uid_t original_effective_uid;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000159
Damien Miller1383bd82000-04-06 12:32:37 +1000160/* command to be executed */
161Buffer command;
162
Damien Miller832562e2001-01-30 09:30:01 +1100163/* Should we execute a command or invoke a subsystem? */
164int subsystem_flag = 0;
165
Damien Miller2797f7f2002-04-23 21:09:44 +1000166/* # of replies received for global requests */
Darren Tucker9f407c42008-06-13 04:50:27 +1000167static int remote_forward_confirms_received = 0;
Damien Miller2797f7f2002-04-23 21:09:44 +1000168
Damien Miller8c4e18a2002-09-19 12:05:02 +1000169/* pid of proxycommand child process */
170pid_t proxy_command_pid = 0;
171
Damien Millerb1cbfa22008-05-19 16:00:08 +1000172/* mux.c */
173extern int muxserver_sock;
174extern u_int muxclient_command;
Damien Miller0e220db2004-06-15 10:34:08 +1000175
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000176/* Prints a help message to the user. This function never returns. */
177
Ben Lindstrombba81212001-06-25 05:01:22 +0000178static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000179usage(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000180{
Damien Miller50955102004-03-22 09:34:58 +1100181 fprintf(stderr,
Damien Millerc13c3ee2008-11-03 19:23:28 +1100182"usage: ssh [-1246AaCfgKkMNnqsTtVvXxYy] [-b bind_address] [-c cipher_spec]\n"
Darren Tucker895d6982005-10-03 18:18:05 +1000183" [-D [bind_address:]port] [-e escape_char] [-F configfile]\n"
Damien Miller02faece2005-03-02 12:04:32 +1100184" [-i identity_file] [-L [bind_address:]port:host:hostport]\n"
Damien Millerf91ee4c2005-03-01 21:24:33 +1100185" [-l login_name] [-m mac_spec] [-O ctl_cmd] [-o option] [-p port]\n"
Damien Miller02faece2005-03-02 12:04:32 +1100186" [-R [bind_address:]port:host:hostport] [-S ctl_path]\n"
Damien Miller991dba42006-07-10 20:16:27 +1000187" [-w local_tun[:remote_tun]] [user@]hostname [command]\n"
Damien Miller50955102004-03-22 09:34:58 +1100188 );
Darren Tuckere9a9b712005-12-20 16:15:51 +1100189 exit(255);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000190}
191
Ben Lindstrombba81212001-06-25 05:01:22 +0000192static int ssh_session(void);
193static int ssh_session2(void);
194static void load_public_identity_files(void);
Damien Millerb1cbfa22008-05-19 16:00:08 +1000195
196/* from muxclient.c */
197void muxclient(const char *);
198void muxserver_listen(void);
Damien Miller1383bd82000-04-06 12:32:37 +1000199
Damien Miller95def091999-11-25 00:26:21 +1100200/*
201 * Main program for the ssh client.
202 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000203int
204main(int ac, char **av)
205{
Damien Millere272a5b2008-11-03 19:22:37 +1100206 int i, opt, exit_status, use_syslog;
Damien Miller9836cf82003-12-17 16:30:06 +1100207 char *p, *cp, *line, buf[256];
Damien Miller95def091999-11-25 00:26:21 +1100208 struct stat st;
Ben Lindstrom086cf212001-03-05 05:56:40 +0000209 struct passwd *pw;
Damien Miller67bd0622007-09-17 12:06:57 +1000210 int dummy, timeout_ms;
Ben Lindstrom5ccf63a2001-09-24 20:00:10 +0000211 extern int optind, optreset;
Damien Miller4f8e6692001-07-14 13:22:53 +1000212 extern char *optarg;
Damien Miller9651fe62005-06-26 08:55:25 +1000213 struct servent *sp;
Damien Millerf91ee4c2005-03-01 21:24:33 +1100214 Forward fwd;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000215
Darren Tuckerce321d82005-10-03 18:11:24 +1000216 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
217 sanitise_stdfd();
218
Damien Miller59d3d5b2003-08-22 09:34:41 +1000219 __progname = ssh_get_progname(av[0]);
Damien Millerf9b625c2000-07-09 22:42:32 +1000220 init_rng();
221
Damien Miller5428f641999-11-25 11:54:57 +1100222 /*
223 * Save the original real uid. It will be needed later (uid-swapping
224 * may clobber the real uid).
225 */
Damien Miller95def091999-11-25 00:26:21 +1100226 original_real_uid = getuid();
227 original_effective_uid = geteuid();
Damien Millera8e06ce2003-11-21 23:48:55 +1100228
Damien Miller50b9a602002-09-04 16:50:06 +1000229 /*
230 * Use uid-swapping to give up root privileges for the duration of
231 * option processing. We will re-instantiate the rights when we are
232 * ready to create the privileged port, and will permanently drop
233 * them when the port has been created (actually, when the connection
234 * has been made, as we may need to create the port several times).
235 */
236 PRIV_END;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000237
Damien Miller05dd7952000-10-01 00:42:48 +1100238#ifdef HAVE_SETRLIMIT
Damien Miller95def091999-11-25 00:26:21 +1100239 /* If we are installed setuid root be careful to not drop core. */
240 if (original_real_uid != original_effective_uid) {
241 struct rlimit rlim;
242 rlim.rlim_cur = rlim.rlim_max = 0;
243 if (setrlimit(RLIMIT_CORE, &rlim) < 0)
244 fatal("setrlimit failed: %.100s", strerror(errno));
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000245 }
Damien Millerbac2d8a2000-09-05 16:13:06 +1100246#endif
Ben Lindstrom3fcf1a22001-04-08 18:26:59 +0000247 /* Get user data. */
248 pw = getpwuid(original_real_uid);
249 if (!pw) {
Damien Miller996acd22003-04-09 20:59:48 +1000250 logit("You don't exist, go away!");
Darren Tuckere9a9b712005-12-20 16:15:51 +1100251 exit(255);
Ben Lindstrom3fcf1a22001-04-08 18:26:59 +0000252 }
253 /* Take a copy of the returned structure. */
254 pw = pwcopy(pw);
255
Damien Miller5428f641999-11-25 11:54:57 +1100256 /*
Damien Miller5428f641999-11-25 11:54:57 +1100257 * Set our umask to something reasonable, as some files are created
258 * with the default umask. This will make them world-readable but
259 * writable only by the owner, which is ok for all files for which we
260 * don't set the modes explicitly.
261 */
Damien Miller95def091999-11-25 00:26:21 +1100262 umask(022);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000263
Darren Tuckerd6173c02008-06-13 04:52:53 +1000264 /*
265 * Initialize option structure to indicate that no values have been
266 * set.
267 */
Damien Miller95def091999-11-25 00:26:21 +1100268 initialize_options(&options);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000269
Damien Miller95def091999-11-25 00:26:21 +1100270 /* Parse command-line arguments. */
271 host = NULL;
Damien Millere272a5b2008-11-03 19:22:37 +1100272 use_syslog = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000273
Damien Miller2ecb6bd2006-03-15 12:03:53 +1100274 again:
Darren Tuckerd6173c02008-06-13 04:52:53 +1000275 while ((opt = getopt(ac, av, "1246ab:c:e:fgi:kl:m:no:p:qstvx"
Damien Millere272a5b2008-11-03 19:22:37 +1100276 "ACD:F:I:KL:MNO:PR:S:TVw:XYy")) != -1) {
Damien Miller95def091999-11-25 00:26:21 +1100277 switch (opt) {
Ben Lindstrom1e7d3062001-02-09 02:36:43 +0000278 case '1':
279 options.protocol = SSH_PROTO_1;
280 break;
Damien Miller4af51302000-04-16 11:18:38 +1000281 case '2':
282 options.protocol = SSH_PROTO_2;
283 break;
Damien Miller34132e52000-01-14 15:45:46 +1100284 case '4':
Darren Tucker0a4f04b2003-07-03 20:37:47 +1000285 options.address_family = AF_INET;
Damien Miller34132e52000-01-14 15:45:46 +1100286 break;
Damien Miller34132e52000-01-14 15:45:46 +1100287 case '6':
Darren Tucker0a4f04b2003-07-03 20:37:47 +1000288 options.address_family = AF_INET6;
Damien Miller34132e52000-01-14 15:45:46 +1100289 break;
Damien Miller95def091999-11-25 00:26:21 +1100290 case 'n':
291 stdin_null_flag = 1;
292 break;
Damien Miller95def091999-11-25 00:26:21 +1100293 case 'f':
294 fork_after_authentication_flag = 1;
295 stdin_null_flag = 1;
296 break;
Damien Miller95def091999-11-25 00:26:21 +1100297 case 'x':
298 options.forward_x11 = 0;
299 break;
Damien Miller95def091999-11-25 00:26:21 +1100300 case 'X':
301 options.forward_x11 = 1;
302 break;
Damien Millere272a5b2008-11-03 19:22:37 +1100303 case 'y':
304 use_syslog = 1;
305 break;
Darren Tucker0a118da2003-10-15 15:54:32 +1000306 case 'Y':
307 options.forward_x11 = 1;
308 options.forward_x11_trusted = 1;
309 break;
Damien Miller95def091999-11-25 00:26:21 +1100310 case 'g':
311 options.gateway_ports = 1;
312 break;
Darren Tucker7ebfc102004-11-07 20:06:19 +1100313 case 'O':
314 if (strcmp(optarg, "check") == 0)
Damien Millerb1cbfa22008-05-19 16:00:08 +1000315 muxclient_command = SSHMUX_COMMAND_ALIVE_CHECK;
Darren Tucker7ebfc102004-11-07 20:06:19 +1100316 else if (strcmp(optarg, "exit") == 0)
Damien Millerb1cbfa22008-05-19 16:00:08 +1000317 muxclient_command = SSHMUX_COMMAND_TERMINATE;
Darren Tucker7ebfc102004-11-07 20:06:19 +1100318 else
319 fatal("Invalid multiplex command.");
320 break;
Damien Miller147bba32002-09-04 16:46:06 +1000321 case 'P': /* deprecated */
Damien Miller95def091999-11-25 00:26:21 +1100322 options.use_privileged_port = 0;
323 break;
Damien Miller95def091999-11-25 00:26:21 +1100324 case 'a':
325 options.forward_agent = 0;
326 break;
Damien Millerb1715dc2000-05-30 13:44:51 +1000327 case 'A':
328 options.forward_agent = 1;
329 break;
Damien Miller95def091999-11-25 00:26:21 +1100330 case 'k':
Damien Millere0113cc2003-11-24 13:10:09 +1100331 options.gss_deleg_creds = 0;
Damien Miller95def091999-11-25 00:26:21 +1100332 break;
Darren Tucker415bddc2007-06-12 23:43:16 +1000333 case 'K':
334 options.gss_authentication = 1;
335 options.gss_deleg_creds = 1;
336 break;
Damien Miller95def091999-11-25 00:26:21 +1100337 case 'i':
338 if (stat(optarg, &st) < 0) {
Damien Millerf4614452001-07-14 12:18:10 +1000339 fprintf(stderr, "Warning: Identity file %s "
Damien Miller3eb48b62005-03-01 21:15:46 +1100340 "not accessible: %s.\n", optarg,
341 strerror(errno));
Damien Miller95def091999-11-25 00:26:21 +1100342 break;
343 }
Damien Millerf4614452001-07-14 12:18:10 +1000344 if (options.num_identity_files >=
345 SSH_MAX_IDENTITY_FILES)
346 fatal("Too many identity files specified "
347 "(max %d)", SSH_MAX_IDENTITY_FILES);
348 options.identity_files[options.num_identity_files++] =
349 xstrdup(optarg);
Damien Miller95def091999-11-25 00:26:21 +1100350 break;
Ben Lindstromc5b68002001-07-04 04:52:03 +0000351 case 'I':
352#ifdef SMARTCARD
Ben Lindstromf7db3bb2001-08-06 21:35:51 +0000353 options.smartcard_device = xstrdup(optarg);
Ben Lindstrombcc18082001-08-06 21:59:25 +0000354#else
Ben Lindstromc5b68002001-07-04 04:52:03 +0000355 fprintf(stderr, "no support for smartcards.\n");
Ben Lindstrombcc18082001-08-06 21:59:25 +0000356#endif
Ben Lindstromc5b68002001-07-04 04:52:03 +0000357 break;
Damien Miller95def091999-11-25 00:26:21 +1100358 case 't':
Ben Lindstrom4dccfa52000-12-28 16:40:05 +0000359 if (tty_flag)
360 force_tty_flag = 1;
Damien Miller95def091999-11-25 00:26:21 +1100361 tty_flag = 1;
362 break;
Damien Miller95def091999-11-25 00:26:21 +1100363 case 'v':
Darren Tuckere98dfa32003-07-19 19:54:31 +1000364 if (debug_flag == 0) {
Damien Millere4340be2000-09-16 13:29:08 +1100365 debug_flag = 1;
366 options.log_level = SYSLOG_LEVEL_DEBUG1;
Darren Tuckere98dfa32003-07-19 19:54:31 +1000367 } else {
368 if (options.log_level < SYSLOG_LEVEL_DEBUG3)
369 options.log_level++;
Damien Millere4340be2000-09-16 13:29:08 +1100370 break;
Darren Tuckere98dfa32003-07-19 19:54:31 +1000371 }
Darren Tuckere9bf9842004-11-05 20:05:32 +1100372 /* FALLTHROUGH */
Damien Miller95def091999-11-25 00:26:21 +1100373 case 'V':
Damien Miller0c889cd2004-03-22 09:36:00 +1100374 fprintf(stderr, "%s, %s\n",
Damien Miller2aa6d3c2004-09-12 16:53:04 +1000375 SSH_RELEASE, SSLeay_version(SSLEAY_VERSION));
Damien Miller95def091999-11-25 00:26:21 +1100376 if (opt == 'V')
377 exit(0);
Damien Miller95def091999-11-25 00:26:21 +1100378 break;
Damien Millerd27b9472005-12-13 19:29:02 +1100379 case 'w':
Damien Miller7b58e802005-12-13 19:33:19 +1100380 if (options.tun_open == -1)
381 options.tun_open = SSH_TUNMODE_DEFAULT;
Damien Millerd27b9472005-12-13 19:29:02 +1100382 options.tun_local = a2tun(optarg, &options.tun_remote);
Damien Miller7b58e802005-12-13 19:33:19 +1100383 if (options.tun_local == SSH_TUNID_ERR) {
Darren Tuckerd6173c02008-06-13 04:52:53 +1000384 fprintf(stderr,
385 "Bad tun device '%s'\n", optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100386 exit(255);
Damien Millerd27b9472005-12-13 19:29:02 +1100387 }
388 break;
Damien Miller95def091999-11-25 00:26:21 +1100389 case 'q':
390 options.log_level = SYSLOG_LEVEL_QUIET;
391 break;
Damien Miller95def091999-11-25 00:26:21 +1100392 case 'e':
393 if (optarg[0] == '^' && optarg[2] == 0 &&
Damien Millerf4614452001-07-14 12:18:10 +1000394 (u_char) optarg[1] >= 64 &&
395 (u_char) optarg[1] < 128)
Ben Lindstrom46c16222000-12-22 01:43:59 +0000396 options.escape_char = (u_char) optarg[1] & 31;
Damien Miller95def091999-11-25 00:26:21 +1100397 else if (strlen(optarg) == 1)
Ben Lindstrom46c16222000-12-22 01:43:59 +0000398 options.escape_char = (u_char) optarg[0];
Damien Miller95def091999-11-25 00:26:21 +1100399 else if (strcmp(optarg, "none") == 0)
Ben Lindstrom2b1f71b2001-06-05 20:32:21 +0000400 options.escape_char = SSH_ESCAPECHAR_NONE;
Damien Miller95def091999-11-25 00:26:21 +1100401 else {
Damien Millerf4614452001-07-14 12:18:10 +1000402 fprintf(stderr, "Bad escape character '%s'.\n",
403 optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100404 exit(255);
Damien Miller95def091999-11-25 00:26:21 +1100405 }
406 break;
Damien Miller95def091999-11-25 00:26:21 +1100407 case 'c':
Damien Millereba71ba2000-04-29 23:57:08 +1000408 if (ciphers_valid(optarg)) {
409 /* SSH2 only */
410 options.ciphers = xstrdup(optarg);
Darren Tucker5cb30ad2004-08-12 22:40:24 +1000411 options.cipher = SSH_CIPHER_INVALID;
Damien Millereba71ba2000-04-29 23:57:08 +1000412 } else {
413 /* SSH1 only */
Damien Millere39cacc2000-11-29 12:18:44 +1100414 options.cipher = cipher_number(optarg);
415 if (options.cipher == -1) {
Damien Millerf4614452001-07-14 12:18:10 +1000416 fprintf(stderr,
417 "Unknown cipher type '%s'\n",
418 optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100419 exit(255);
Damien Millereba71ba2000-04-29 23:57:08 +1000420 }
Damien Millerf4614452001-07-14 12:18:10 +1000421 if (options.cipher == SSH_CIPHER_3DES)
Damien Millere39cacc2000-11-29 12:18:44 +1100422 options.ciphers = "3des-cbc";
Damien Millerf4614452001-07-14 12:18:10 +1000423 else if (options.cipher == SSH_CIPHER_BLOWFISH)
Damien Millere39cacc2000-11-29 12:18:44 +1100424 options.ciphers = "blowfish-cbc";
Damien Millerf4614452001-07-14 12:18:10 +1000425 else
Damien Millere39cacc2000-11-29 12:18:44 +1100426 options.ciphers = (char *)-1;
Damien Miller95def091999-11-25 00:26:21 +1100427 }
428 break;
Ben Lindstrom06b33aa2001-02-15 03:01:59 +0000429 case 'm':
430 if (mac_valid(optarg))
431 options.macs = xstrdup(optarg);
432 else {
Damien Millerf4614452001-07-14 12:18:10 +1000433 fprintf(stderr, "Unknown mac type '%s'\n",
434 optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100435 exit(255);
Ben Lindstrom06b33aa2001-02-15 03:01:59 +0000436 }
437 break;
Damien Miller0e220db2004-06-15 10:34:08 +1000438 case 'M':
Damien Millerd14b1e72005-06-16 13:19:41 +1000439 if (options.control_master == SSHCTL_MASTER_YES)
440 options.control_master = SSHCTL_MASTER_ASK;
441 else
442 options.control_master = SSHCTL_MASTER_YES;
Damien Miller0e220db2004-06-15 10:34:08 +1000443 break;
Damien Miller95def091999-11-25 00:26:21 +1100444 case 'p':
Ben Lindstrom19066a12001-04-12 23:39:26 +0000445 options.port = a2port(optarg);
446 if (options.port == 0) {
Ben Lindstrom146edb92001-04-11 23:06:28 +0000447 fprintf(stderr, "Bad port '%s'\n", optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100448 exit(255);
Ben Lindstrom146edb92001-04-11 23:06:28 +0000449 }
Damien Miller95def091999-11-25 00:26:21 +1100450 break;
Damien Miller95def091999-11-25 00:26:21 +1100451 case 'l':
452 options.user = optarg;
453 break;
Ben Lindstrom1a174712001-09-12 17:56:15 +0000454
Damien Miller95def091999-11-25 00:26:21 +1100455 case 'L':
Damien Millerf91ee4c2005-03-01 21:24:33 +1100456 if (parse_forward(&fwd, optarg))
457 add_local_forward(&options, &fwd);
458 else {
Damien Millerf4614452001-07-14 12:18:10 +1000459 fprintf(stderr,
Damien Millerf91ee4c2005-03-01 21:24:33 +1100460 "Bad local forwarding specification '%s'\n",
Damien Millerf4614452001-07-14 12:18:10 +1000461 optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100462 exit(255);
Ben Lindstrom1a174712001-09-12 17:56:15 +0000463 }
Damien Millerf91ee4c2005-03-01 21:24:33 +1100464 break;
465
466 case 'R':
467 if (parse_forward(&fwd, optarg)) {
468 add_remote_forward(&options, &fwd);
469 } else {
470 fprintf(stderr,
471 "Bad remote forwarding specification "
472 "'%s'\n", optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100473 exit(255);
Damien Millerf91ee4c2005-03-01 21:24:33 +1100474 }
Damien Miller95def091999-11-25 00:26:21 +1100475 break;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000476
477 case 'D':
Damien Millerf91ee4c2005-03-01 21:24:33 +1100478 cp = p = xstrdup(optarg);
479 memset(&fwd, '\0', sizeof(fwd));
480 fwd.connect_host = "socks";
481 if ((fwd.listen_host = hpdelim(&cp)) == NULL) {
482 fprintf(stderr, "Bad dynamic forwarding "
483 "specification '%.100s'\n", optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100484 exit(255);
Damien Millerf91ee4c2005-03-01 21:24:33 +1100485 }
486 if (cp != NULL) {
487 fwd.listen_port = a2port(cp);
Darren Tuckerd6173c02008-06-13 04:52:53 +1000488 fwd.listen_host =
489 cleanhostname(fwd.listen_host);
Damien Millerf91ee4c2005-03-01 21:24:33 +1100490 } else {
491 fwd.listen_port = a2port(fwd.listen_host);
Damien Millerbe1045d2005-08-12 22:10:56 +1000492 fwd.listen_host = NULL;
Damien Millerf91ee4c2005-03-01 21:24:33 +1100493 }
494
495 if (fwd.listen_port == 0) {
Damien Millerf4614452001-07-14 12:18:10 +1000496 fprintf(stderr, "Bad dynamic port '%s'\n",
497 optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100498 exit(255);
Ben Lindstrom146edb92001-04-11 23:06:28 +0000499 }
Damien Millerf91ee4c2005-03-01 21:24:33 +1100500 add_local_forward(&options, &fwd);
501 xfree(p);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000502 break;
503
Damien Miller95def091999-11-25 00:26:21 +1100504 case 'C':
505 options.compression = 1;
506 break;
Damien Miller1383bd82000-04-06 12:32:37 +1000507 case 'N':
508 no_shell_flag = 1;
509 no_tty_flag = 1;
510 break;
Damien Miller1383bd82000-04-06 12:32:37 +1000511 case 'T':
512 no_tty_flag = 1;
513 break;
Damien Miller95def091999-11-25 00:26:21 +1100514 case 'o':
515 dummy = 1;
Damien Miller9836cf82003-12-17 16:30:06 +1100516 line = xstrdup(optarg);
Damien Millerf4614452001-07-14 12:18:10 +1000517 if (process_config_line(&options, host ? host : "",
Damien Miller9836cf82003-12-17 16:30:06 +1100518 line, "command-line", 0, &dummy) != 0)
Darren Tuckere9a9b712005-12-20 16:15:51 +1100519 exit(255);
Damien Miller9836cf82003-12-17 16:30:06 +1100520 xfree(line);
Damien Miller95def091999-11-25 00:26:21 +1100521 break;
Damien Miller832562e2001-01-30 09:30:01 +1100522 case 's':
523 subsystem_flag = 1;
524 break;
Damien Miller0e220db2004-06-15 10:34:08 +1000525 case 'S':
526 if (options.control_path != NULL)
527 free(options.control_path);
528 options.control_path = xstrdup(optarg);
Damien Miller0e220db2004-06-15 10:34:08 +1000529 break;
Ben Lindstrome0f88042001-04-30 13:06:24 +0000530 case 'b':
531 options.bind_address = optarg;
532 break;
Ben Lindstrom14f31ab2001-09-12 17:48:04 +0000533 case 'F':
534 config = optarg;
535 break;
Damien Miller95def091999-11-25 00:26:21 +1100536 default:
537 usage();
538 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000539 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000540
Damien Millerf4614452001-07-14 12:18:10 +1000541 ac -= optind;
542 av += optind;
543
544 if (ac > 0 && !host && **av != '-') {
Ben Lindstromc276c122002-12-23 02:14:51 +0000545 if (strrchr(*av, '@')) {
Damien Millerf4614452001-07-14 12:18:10 +1000546 p = xstrdup(*av);
Ben Lindstromc276c122002-12-23 02:14:51 +0000547 cp = strrchr(p, '@');
Damien Millerf4614452001-07-14 12:18:10 +1000548 if (cp == NULL || cp == p)
549 usage();
550 options.user = p;
551 *cp = '\0';
552 host = ++cp;
553 } else
554 host = *av;
Ben Lindstromb9fa6912002-12-23 02:24:54 +0000555 if (ac > 1) {
556 optind = optreset = 1;
Damien Millerf4614452001-07-14 12:18:10 +1000557 goto again;
558 }
Ben Lindstromb9fa6912002-12-23 02:24:54 +0000559 ac--, av++;
Damien Millerf4614452001-07-14 12:18:10 +1000560 }
561
Damien Miller95def091999-11-25 00:26:21 +1100562 /* Check that we got a host name. */
563 if (!host)
564 usage();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000565
Damien Millercb5e44a2000-09-29 12:12:36 +1100566 SSLeay_add_all_algorithms();
Damien Miller0bc1bd82000-11-13 22:57:25 +1100567 ERR_load_crypto_strings();
Damien Millercb5e44a2000-09-29 12:12:36 +1100568
Damien Miller95def091999-11-25 00:26:21 +1100569 /* Initialize the command to execute on remote host. */
570 buffer_init(&command);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000571
Damien Miller5428f641999-11-25 11:54:57 +1100572 /*
573 * Save the command to execute on the remote host in a buffer. There
574 * is no limit on the length of the command, except by the maximum
575 * packet size. Also sets the tty flag if there is no command.
576 */
Damien Millerf4614452001-07-14 12:18:10 +1000577 if (!ac) {
Damien Miller95def091999-11-25 00:26:21 +1100578 /* No command specified - execute shell on a tty. */
579 tty_flag = 1;
Damien Miller832562e2001-01-30 09:30:01 +1100580 if (subsystem_flag) {
Damien Millerf4614452001-07-14 12:18:10 +1000581 fprintf(stderr,
582 "You must specify a subsystem to invoke.\n");
Damien Miller832562e2001-01-30 09:30:01 +1100583 usage();
584 }
Damien Miller95def091999-11-25 00:26:21 +1100585 } else {
Damien Millerf4614452001-07-14 12:18:10 +1000586 /* A command has been specified. Store it into the buffer. */
587 for (i = 0; i < ac; i++) {
588 if (i)
Damien Miller95def091999-11-25 00:26:21 +1100589 buffer_append(&command, " ", 1);
590 buffer_append(&command, av[i], strlen(av[i]));
591 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000592 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000593
Damien Miller95def091999-11-25 00:26:21 +1100594 /* Cannot fork to background if no command. */
Darren Tuckerd6173c02008-06-13 04:52:53 +1000595 if (fork_after_authentication_flag && buffer_len(&command) == 0 &&
596 !no_shell_flag)
597 fatal("Cannot fork into background without a command "
598 "to execute.");
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000599
Damien Miller95def091999-11-25 00:26:21 +1100600 /* Allocate a tty by default if no command specified. */
601 if (buffer_len(&command) == 0)
602 tty_flag = 1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000603
Ben Lindstroma962c2f2002-07-04 00:14:17 +0000604 /* Force no tty */
Ben Lindstromc72745a2000-12-02 19:03:54 +0000605 if (no_tty_flag)
606 tty_flag = 0;
Damien Miller95def091999-11-25 00:26:21 +1100607 /* Do not allocate a tty if stdin is not a tty. */
Damien Millerddee5752005-05-26 12:05:05 +1000608 if ((!isatty(fileno(stdin)) || stdin_null_flag) && !force_tty_flag) {
Damien Miller95def091999-11-25 00:26:21 +1100609 if (tty_flag)
Darren Tuckerd6173c02008-06-13 04:52:53 +1000610 logit("Pseudo-terminal will not be allocated because "
611 "stdin is not a terminal.");
Damien Miller95def091999-11-25 00:26:21 +1100612 tty_flag = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000613 }
Damien Miller1383bd82000-04-06 12:32:37 +1000614
Ben Lindstrom8a432f52001-03-05 07:24:46 +0000615 /*
616 * Initialize "log" output. Since we are the client all output
617 * actually goes to stderr.
618 */
Darren Tuckerd6173c02008-06-13 04:52:53 +1000619 log_init(av[0],
620 options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level,
Damien Millere272a5b2008-11-03 19:22:37 +1100621 SYSLOG_FACILITY_USER, !use_syslog);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000622
Ben Lindstrom14f31ab2001-09-12 17:48:04 +0000623 /*
624 * Read per-user configuration file. Ignore the system wide config
625 * file if the user specifies a config file on the command line.
626 */
627 if (config != NULL) {
Damien Miller914420f2004-04-20 20:14:07 +1000628 if (!read_config_file(config, host, &options, 0))
Ben Lindstromedc0cf22001-09-12 18:32:20 +0000629 fatal("Can't open user config file %.100s: "
630 "%.100s", config, strerror(errno));
Damien Miller80163902007-01-05 16:30:16 +1100631 } else {
Ben Lindstrom14f31ab2001-09-12 17:48:04 +0000632 snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir,
633 _PATH_SSH_USER_CONFFILE);
Damien Miller57a44762004-04-20 20:11:57 +1000634 (void)read_config_file(buf, host, &options, 1);
Ben Lindstrom83f07d12001-10-03 17:22:29 +0000635
636 /* Read systemwide configuration file after use config. */
Darren Tuckerfc959702004-07-17 16:12:08 +1000637 (void)read_config_file(_PATH_HOST_CONFIG_FILE, host,
Damien Miller57a44762004-04-20 20:11:57 +1000638 &options, 0);
Ben Lindstrom14f31ab2001-09-12 17:48:04 +0000639 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000640
Damien Miller95def091999-11-25 00:26:21 +1100641 /* Fill configuration defaults. */
642 fill_default_options(&options);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000643
Darren Tucker0a4f04b2003-07-03 20:37:47 +1000644 channel_set_af(options.address_family);
645
Damien Miller95def091999-11-25 00:26:21 +1100646 /* reinit */
Damien Millere272a5b2008-11-03 19:22:37 +1100647 log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, !use_syslog);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000648
Damien Miller60bc5172001-03-19 09:38:15 +1100649 seed_rng();
650
Damien Miller95def091999-11-25 00:26:21 +1100651 if (options.user == NULL)
652 options.user = xstrdup(pw->pw_name);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000653
Darren Tuckerf6b01b72008-06-13 04:56:37 +1000654 /* Get default port if port has not been set. */
655 if (options.port == 0) {
656 sp = getservbyname(SSH_SERVICE_NAME, "tcp");
657 options.port = sp ? ntohs(sp->s_port) : SSH_DEFAULT_PORT;
658 }
659
660 if (options.local_command != NULL) {
661 char thishost[NI_MAXHOST];
662
663 if (gethostname(thishost, sizeof(thishost)) == -1)
664 fatal("gethostname: %s", strerror(errno));
665 snprintf(buf, sizeof(buf), "%d", options.port);
666 debug3("expanding LocalCommand: %s", options.local_command);
667 cp = options.local_command;
668 options.local_command = percent_expand(cp, "d", pw->pw_dir,
669 "h", options.hostname? options.hostname : host,
670 "l", thishost, "n", host, "r", options.user, "p", buf,
671 "u", pw->pw_name, (char *)NULL);
672 debug3("expanded LocalCommand: %s", options.local_command);
673 xfree(cp);
674 }
675
Damien Miller95def091999-11-25 00:26:21 +1100676 if (options.hostname != NULL)
677 host = options.hostname;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000678
Darren Tucker3f521e22003-07-03 16:20:42 +1000679 /* force lowercase for hostkey matching */
680 if (options.host_key_alias != NULL) {
681 for (p = options.host_key_alias; *p; p++)
682 if (isupper(*p))
Damien Miller1d2b6702006-03-26 14:09:54 +1100683 *p = (char)tolower(*p);
Darren Tucker3f521e22003-07-03 16:20:42 +1000684 }
685
Damien Miller9f1e33a2003-02-24 11:57:32 +1100686 if (options.proxy_command != NULL &&
Darren Tucker32e42c72007-12-02 23:01:03 +1100687 strcmp(options.proxy_command, "none") == 0) {
688 xfree(options.proxy_command);
Damien Miller9f1e33a2003-02-24 11:57:32 +1100689 options.proxy_command = NULL;
Darren Tucker32e42c72007-12-02 23:01:03 +1100690 }
Damien Miller8f74c8f2005-06-26 08:56:03 +1000691 if (options.control_path != NULL &&
Darren Tucker32e42c72007-12-02 23:01:03 +1100692 strcmp(options.control_path, "none") == 0) {
693 xfree(options.control_path);
Damien Miller8f74c8f2005-06-26 08:56:03 +1000694 options.control_path = NULL;
Darren Tucker32e42c72007-12-02 23:01:03 +1100695 }
Damien Miller9f1e33a2003-02-24 11:57:32 +1100696
Damien Miller0e220db2004-06-15 10:34:08 +1000697 if (options.control_path != NULL) {
Damien Miller6b1d53c2006-03-31 23:13:21 +1100698 char thishost[NI_MAXHOST];
Damien Miller3ec54c72006-03-15 11:30:13 +1100699
Damien Miller6b1d53c2006-03-31 23:13:21 +1100700 if (gethostname(thishost, sizeof(thishost)) == -1)
Damien Miller3ec54c72006-03-15 11:30:13 +1100701 fatal("gethostname: %s", strerror(errno));
Damien Miller6476cad2005-06-16 13:18:34 +1000702 snprintf(buf, sizeof(buf), "%d", options.port);
703 cp = tilde_expand_filename(options.control_path,
704 original_real_uid);
Darren Tucker32e42c72007-12-02 23:01:03 +1100705 xfree(options.control_path);
Damien Miller6476cad2005-06-16 13:18:34 +1000706 options.control_path = percent_expand(cp, "p", buf, "h", host,
Damien Miller6b1d53c2006-03-31 23:13:21 +1100707 "r", options.user, "l", thishost, (char *)NULL);
Damien Miller6476cad2005-06-16 13:18:34 +1000708 xfree(cp);
Damien Miller0e220db2004-06-15 10:34:08 +1000709 }
Damien Millerb1cbfa22008-05-19 16:00:08 +1000710 if (muxclient_command != 0 && options.control_path == NULL)
Darren Tucker0814d312005-06-01 23:08:51 +1000711 fatal("No ControlPath specified for \"-O\" command");
Damien Millerd14b1e72005-06-16 13:19:41 +1000712 if (options.control_path != NULL)
Damien Millerb1cbfa22008-05-19 16:00:08 +1000713 muxclient(options.control_path);
Damien Miller0e220db2004-06-15 10:34:08 +1000714
Damien Miller67bd0622007-09-17 12:06:57 +1000715 timeout_ms = options.connection_timeout * 1000;
716
Kevin Stevesfcec7f82000-12-15 19:55:48 +0000717 /* Open a connection to the remote host. */
Darren Tucker0a4f04b2003-07-03 20:37:47 +1000718 if (ssh_connect(host, &hostaddr, options.port,
Damien Miller67bd0622007-09-17 12:06:57 +1000719 options.address_family, options.connection_attempts, &timeout_ms,
720 options.tcp_keep_alive,
Ben Lindstrom1aa64272002-06-11 20:28:05 +0000721#ifdef HAVE_CYGWIN
722 options.use_privileged_port,
723#else
Ben Lindstromf9c48842002-06-11 16:37:51 +0000724 original_effective_uid == 0 && options.use_privileged_port,
Ben Lindstrom1aa64272002-06-11 20:28:05 +0000725#endif
Ben Lindstromda394ca2002-06-12 16:11:12 +0000726 options.proxy_command) != 0)
Darren Tuckere9a9b712005-12-20 16:15:51 +1100727 exit(255);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000728
Damien Miller67bd0622007-09-17 12:06:57 +1000729 if (timeout_ms > 0)
730 debug3("timeout: %d ms remain after connect", timeout_ms);
731
Damien Miller5428f641999-11-25 11:54:57 +1100732 /*
733 * If we successfully made the connection, load the host private key
734 * in case we will need it later for combined rsa-rhosts
735 * authentication. This must be done before releasing extra
736 * privileges, because the file is only readable by root.
Ben Lindstrom9e5bb572002-06-06 19:58:27 +0000737 * If we cannot access the private keys, load the public keys
738 * instead and try to execute the ssh-keysign helper instead.
Damien Miller5428f641999-11-25 11:54:57 +1100739 */
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000740 sensitive_data.nkeys = 0;
741 sensitive_data.keys = NULL;
Ben Lindstrom1bad2562002-06-06 19:57:33 +0000742 sensitive_data.external_keysign = 0;
Ben Lindstrom24157572002-06-12 16:09:39 +0000743 if (options.rhosts_rsa_authentication ||
744 options.hostbased_authentication) {
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000745 sensitive_data.nkeys = 3;
Damien Millerddd63ab2006-03-31 23:10:51 +1100746 sensitive_data.keys = xcalloc(sensitive_data.nkeys,
Ben Lindstroma962c2f2002-07-04 00:14:17 +0000747 sizeof(Key));
Ben Lindstromf9c48842002-06-11 16:37:51 +0000748
749 PRIV_START;
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000750 sensitive_data.keys[0] = key_load_private_type(KEY_RSA1,
Darren Tucker232b76f2006-05-06 17:41:51 +1000751 _PATH_HOST_KEY_FILE, "", NULL, NULL);
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000752 sensitive_data.keys[1] = key_load_private_type(KEY_DSA,
Darren Tucker232b76f2006-05-06 17:41:51 +1000753 _PATH_HOST_DSA_KEY_FILE, "", NULL, NULL);
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000754 sensitive_data.keys[2] = key_load_private_type(KEY_RSA,
Darren Tucker232b76f2006-05-06 17:41:51 +1000755 _PATH_HOST_RSA_KEY_FILE, "", NULL, NULL);
Ben Lindstromf9c48842002-06-11 16:37:51 +0000756 PRIV_END;
Ben Lindstrom1bad2562002-06-06 19:57:33 +0000757
Ben Lindstrom5d35a2f2002-07-04 00:19:40 +0000758 if (options.hostbased_authentication == 1 &&
759 sensitive_data.keys[0] == NULL &&
Ben Lindstrom1bad2562002-06-06 19:57:33 +0000760 sensitive_data.keys[1] == NULL &&
761 sensitive_data.keys[2] == NULL) {
762 sensitive_data.keys[1] = key_load_public(
763 _PATH_HOST_DSA_KEY_FILE, NULL);
764 sensitive_data.keys[2] = key_load_public(
765 _PATH_HOST_RSA_KEY_FILE, NULL);
766 sensitive_data.external_keysign = 1;
767 }
Damien Miller95def091999-11-25 00:26:21 +1100768 }
Damien Miller5428f641999-11-25 11:54:57 +1100769 /*
770 * Get rid of any extra privileges that we may have. We will no
771 * longer need them. Also, extra privileges could make it very hard
772 * to read identity files and other non-world-readable files from the
773 * user's home directory if it happens to be on a NFS volume where
774 * root is mapped to nobody.
775 */
Darren Tucker25f60a72004-08-15 17:23:34 +1000776 if (original_effective_uid == 0) {
777 PRIV_START;
778 permanently_set_uid(pw);
779 }
Damien Miller95def091999-11-25 00:26:21 +1100780
Damien Miller5428f641999-11-25 11:54:57 +1100781 /*
782 * Now that we are back to our own permissions, create ~/.ssh
Damien Miller788f2122005-11-05 15:14:59 +1100783 * directory if it doesn't already exist.
Damien Miller5428f641999-11-25 11:54:57 +1100784 */
Darren Tuckerd6173c02008-06-13 04:52:53 +1000785 snprintf(buf, sizeof buf, "%.100s%s%.100s", pw->pw_dir,
786 strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR);
Damien Miller95def091999-11-25 00:26:21 +1100787 if (stat(buf, &st) < 0)
Damien Millerbe484b52000-07-15 14:14:16 +1000788 if (mkdir(buf, 0700) < 0)
Damien Miller95def091999-11-25 00:26:21 +1100789 error("Could not create directory '%.200s'.", buf);
790
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000791 /* load options.identity_files */
792 load_public_identity_files();
793
794 /* Expand ~ in known host file names. */
795 /* XXX mem-leaks: */
Damien Miller0bc1bd82000-11-13 22:57:25 +1100796 options.system_hostfile =
797 tilde_expand_filename(options.system_hostfile, original_real_uid);
798 options.user_hostfile =
799 tilde_expand_filename(options.user_hostfile, original_real_uid);
800 options.system_hostfile2 =
801 tilde_expand_filename(options.system_hostfile2, original_real_uid);
802 options.user_hostfile2 =
803 tilde_expand_filename(options.user_hostfile2, original_real_uid);
Damien Miller95def091999-11-25 00:26:21 +1100804
Damien Miller07cd5892001-11-12 10:52:03 +1100805 signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
806
Darren Tuckerd6173c02008-06-13 04:52:53 +1000807 /* Log into the remote system. Never returns if the login fails. */
Damien Miller67bd0622007-09-17 12:06:57 +1000808 ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr,
809 pw, timeout_ms);
Damien Miller95def091999-11-25 00:26:21 +1100810
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000811 /* We no longer need the private host keys. Clear them now. */
812 if (sensitive_data.nkeys != 0) {
813 for (i = 0; i < sensitive_data.nkeys; i++) {
814 if (sensitive_data.keys[i] != NULL) {
815 /* Destroys contents safely */
816 debug3("clear hostkey %d", i);
817 key_free(sensitive_data.keys[i]);
818 sensitive_data.keys[i] = NULL;
819 }
820 }
821 xfree(sensitive_data.keys);
822 }
Ben Lindstroma6c8a8d2001-08-06 21:42:00 +0000823 for (i = 0; i < options.num_identity_files; i++) {
824 if (options.identity_files[i]) {
825 xfree(options.identity_files[i]);
826 options.identity_files[i] = NULL;
827 }
828 if (options.identity_keys[i]) {
829 key_free(options.identity_keys[i]);
830 options.identity_keys[i] = NULL;
831 }
832 }
Damien Miller95def091999-11-25 00:26:21 +1100833
Damien Miller1383bd82000-04-06 12:32:37 +1000834 exit_status = compat20 ? ssh_session2() : ssh_session();
835 packet_close();
Damien Miller8c4e18a2002-09-19 12:05:02 +1000836
Damien Millerb1cbfa22008-05-19 16:00:08 +1000837 if (options.control_path != NULL && muxserver_sock != -1)
Damien Miller0e220db2004-06-15 10:34:08 +1000838 unlink(options.control_path);
839
Damien Miller8c4e18a2002-09-19 12:05:02 +1000840 /*
Damien Millera8e06ce2003-11-21 23:48:55 +1100841 * Send SIGHUP to proxy command if used. We don't wait() in
Damien Miller8c4e18a2002-09-19 12:05:02 +1000842 * case it hangs and instead rely on init to reap the child
843 */
844 if (proxy_command_pid > 1)
845 kill(proxy_command_pid, SIGHUP);
846
Damien Miller1383bd82000-04-06 12:32:37 +1000847 return exit_status;
848}
849
Darren Tucker9f407c42008-06-13 04:50:27 +1000850/* Callback for remote forward global requests */
851static void
852ssh_confirm_remote_forward(int type, u_int32_t seq, void *ctxt)
853{
854 Forward *rfwd = (Forward *)ctxt;
855
856 debug("remote forward %s for: listen %d, connect %s:%d",
857 type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
858 rfwd->listen_port, rfwd->connect_host, rfwd->connect_port);
859 if (type == SSH2_MSG_REQUEST_FAILURE) {
860 if (options.exit_on_forward_failure)
861 fatal("Error: remote port forwarding failed for "
862 "listen port %d", rfwd->listen_port);
863 else
864 logit("Warning: remote port forwarding failed for "
865 "listen port %d", rfwd->listen_port);
866 }
Darren Tucker9a2a6092008-07-04 12:53:50 +1000867 if (++remote_forward_confirms_received == options.num_remote_forwards) {
Darren Tucker9f407c42008-06-13 04:50:27 +1000868 debug("All remote forwarding requests processed");
Darren Tucker9a2a6092008-07-04 12:53:50 +1000869 if (fork_after_authentication_flag) {
870 fork_after_authentication_flag = 0;
871 if (daemon(1, 1) < 0)
872 fatal("daemon() failed: %.200s",
873 strerror(errno));
874 }
875 }
Darren Tucker9f407c42008-06-13 04:50:27 +1000876}
877
Ben Lindstrombba81212001-06-25 05:01:22 +0000878static void
Damien Miller0bc1bd82000-11-13 22:57:25 +1100879ssh_init_forwarding(void)
880{
Kevin Steves12057502001-02-05 14:54:34 +0000881 int success = 0;
Damien Miller0bc1bd82000-11-13 22:57:25 +1100882 int i;
Kevin Steves12057502001-02-05 14:54:34 +0000883
Damien Miller0bc1bd82000-11-13 22:57:25 +1100884 /* Initiate local TCP/IP port forwardings. */
885 for (i = 0; i < options.num_local_forwards; i++) {
Damien Millerf91ee4c2005-03-01 21:24:33 +1100886 debug("Local connections to %.200s:%d forwarded to remote "
887 "address %.200s:%d",
Darren Tucker47eede72005-03-14 23:08:12 +1100888 (options.local_forwards[i].listen_host == NULL) ?
889 (options.gateway_ports ? "*" : "LOCALHOST") :
Damien Millerf91ee4c2005-03-01 21:24:33 +1100890 options.local_forwards[i].listen_host,
891 options.local_forwards[i].listen_port,
892 options.local_forwards[i].connect_host,
893 options.local_forwards[i].connect_port);
Damien Millerb16461c2002-01-22 23:29:22 +1100894 success += channel_setup_local_fwd_listener(
Damien Millerf91ee4c2005-03-01 21:24:33 +1100895 options.local_forwards[i].listen_host,
896 options.local_forwards[i].listen_port,
897 options.local_forwards[i].connect_host,
898 options.local_forwards[i].connect_port,
Damien Miller0bc1bd82000-11-13 22:57:25 +1100899 options.gateway_ports);
900 }
Darren Tuckere7d4b192006-07-12 22:17:10 +1000901 if (i > 0 && success != i && options.exit_on_forward_failure)
902 fatal("Could not request local forwarding.");
Kevin Steves12057502001-02-05 14:54:34 +0000903 if (i > 0 && success == 0)
904 error("Could not request local forwarding.");
Damien Miller0bc1bd82000-11-13 22:57:25 +1100905
906 /* Initiate remote TCP/IP port forwardings. */
907 for (i = 0; i < options.num_remote_forwards; i++) {
Damien Millerf91ee4c2005-03-01 21:24:33 +1100908 debug("Remote connections from %.200s:%d forwarded to "
909 "local address %.200s:%d",
Damien Miller46d38de2005-07-17 17:02:09 +1000910 (options.remote_forwards[i].listen_host == NULL) ?
Damien Milleraa3bb102005-11-05 15:12:59 +1100911 "LOCALHOST" : options.remote_forwards[i].listen_host,
Damien Millerf91ee4c2005-03-01 21:24:33 +1100912 options.remote_forwards[i].listen_port,
913 options.remote_forwards[i].connect_host,
914 options.remote_forwards[i].connect_port);
Darren Tuckere7d4b192006-07-12 22:17:10 +1000915 if (channel_request_remote_forwarding(
Damien Millerf91ee4c2005-03-01 21:24:33 +1100916 options.remote_forwards[i].listen_host,
917 options.remote_forwards[i].listen_port,
918 options.remote_forwards[i].connect_host,
Darren Tuckere7d4b192006-07-12 22:17:10 +1000919 options.remote_forwards[i].connect_port) < 0) {
920 if (options.exit_on_forward_failure)
921 fatal("Could not request remote forwarding.");
922 else
923 logit("Warning: Could not request remote "
924 "forwarding.");
925 }
Darren Tucker9f407c42008-06-13 04:50:27 +1000926 client_register_global_confirm(ssh_confirm_remote_forward,
927 &options.remote_forwards[i]);
Damien Miller0bc1bd82000-11-13 22:57:25 +1100928 }
Damien Millerb3ce9fe2007-08-08 14:32:41 +1000929
930 /* Initiate tunnel forwarding. */
931 if (options.tun_open != SSH_TUNMODE_NO) {
932 if (client_request_tun_fwd(options.tun_open,
933 options.tun_local, options.tun_remote) == -1) {
934 if (options.exit_on_forward_failure)
935 fatal("Could not request tunnel forwarding.");
936 else
937 error("Could not request tunnel forwarding.");
938 }
939 }
Damien Miller0bc1bd82000-11-13 22:57:25 +1100940}
941
Ben Lindstrombba81212001-06-25 05:01:22 +0000942static void
Damien Miller0bc1bd82000-11-13 22:57:25 +1100943check_agent_present(void)
944{
945 if (options.forward_agent) {
Damien Miller788f2122005-11-05 15:14:59 +1100946 /* Clear agent forwarding if we don't have an agent. */
Damien Miller789e95d2002-09-12 09:52:46 +1000947 if (!ssh_agent_present())
Damien Miller0bc1bd82000-11-13 22:57:25 +1100948 options.forward_agent = 0;
Damien Miller0bc1bd82000-11-13 22:57:25 +1100949 }
950}
951
Ben Lindstrombba81212001-06-25 05:01:22 +0000952static int
Damien Miller1383bd82000-04-06 12:32:37 +1000953ssh_session(void)
954{
955 int type;
Damien Miller1383bd82000-04-06 12:32:37 +1000956 int interactive = 0;
957 int have_tty = 0;
958 struct winsize ws;
Damien Miller1383bd82000-04-06 12:32:37 +1000959 char *cp;
Damien Miller17e7ed02005-06-17 12:54:33 +1000960 const char *display;
Damien Miller1383bd82000-04-06 12:32:37 +1000961
Damien Miller95def091999-11-25 00:26:21 +1100962 /* Enable compression if requested. */
963 if (options.compression) {
Darren Tuckerd6173c02008-06-13 04:52:53 +1000964 debug("Requesting compression at level %d.",
965 options.compression_level);
Damien Miller95def091999-11-25 00:26:21 +1100966
Darren Tuckerd6173c02008-06-13 04:52:53 +1000967 if (options.compression_level < 1 ||
968 options.compression_level > 9)
969 fatal("Compression level must be from 1 (fast) to "
970 "9 (slow, best).");
Damien Miller95def091999-11-25 00:26:21 +1100971
972 /* Send the request. */
973 packet_start(SSH_CMSG_REQUEST_COMPRESSION);
974 packet_put_int(options.compression_level);
975 packet_send();
976 packet_write_wait();
Damien Millerdff50992002-01-22 23:16:32 +1100977 type = packet_read();
Damien Miller95def091999-11-25 00:26:21 +1100978 if (type == SSH_SMSG_SUCCESS)
979 packet_start_compression(options.compression_level);
980 else if (type == SSH_SMSG_FAILURE)
Damien Miller996acd22003-04-09 20:59:48 +1000981 logit("Warning: Remote host refused compression.");
Damien Miller95def091999-11-25 00:26:21 +1100982 else
Darren Tuckerd6173c02008-06-13 04:52:53 +1000983 packet_disconnect("Protocol error waiting for "
984 "compression response.");
Damien Miller95def091999-11-25 00:26:21 +1100985 }
986 /* Allocate a pseudo tty if appropriate. */
987 if (tty_flag) {
988 debug("Requesting pty.");
989
990 /* Start the packet. */
991 packet_start(SSH_CMSG_REQUEST_PTY);
992
993 /* Store TERM in the packet. There is no limit on the
994 length of the string. */
995 cp = getenv("TERM");
996 if (!cp)
997 cp = "";
Ben Lindstrom664408d2001-06-09 01:42:01 +0000998 packet_put_cstring(cp);
Damien Miller95def091999-11-25 00:26:21 +1100999
1000 /* Store window size in the packet. */
1001 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
1002 memset(&ws, 0, sizeof(ws));
Damien Miller71a73672006-03-26 14:04:36 +11001003 packet_put_int((u_int)ws.ws_row);
1004 packet_put_int((u_int)ws.ws_col);
1005 packet_put_int((u_int)ws.ws_xpixel);
1006 packet_put_int((u_int)ws.ws_ypixel);
Damien Miller95def091999-11-25 00:26:21 +11001007
1008 /* Store tty modes in the packet. */
Ben Lindstromae8e2d32001-04-14 23:13:02 +00001009 tty_make_modes(fileno(stdin), NULL);
Damien Miller95def091999-11-25 00:26:21 +11001010
1011 /* Send the packet, and wait for it to leave. */
1012 packet_send();
1013 packet_write_wait();
1014
1015 /* Read response from the server. */
Damien Millerdff50992002-01-22 23:16:32 +11001016 type = packet_read();
Damien Miller450a7a12000-03-26 13:04:51 +10001017 if (type == SSH_SMSG_SUCCESS) {
Damien Miller95def091999-11-25 00:26:21 +11001018 interactive = 1;
Damien Miller1383bd82000-04-06 12:32:37 +10001019 have_tty = 1;
Damien Miller450a7a12000-03-26 13:04:51 +10001020 } else if (type == SSH_SMSG_FAILURE)
Darren Tuckerd6173c02008-06-13 04:52:53 +10001021 logit("Warning: Remote host failed or refused to "
1022 "allocate a pseudo tty.");
Damien Miller95def091999-11-25 00:26:21 +11001023 else
Darren Tuckerd6173c02008-06-13 04:52:53 +10001024 packet_disconnect("Protocol error waiting for pty "
1025 "request response.");
Damien Miller95def091999-11-25 00:26:21 +11001026 }
1027 /* Request X11 forwarding if enabled and DISPLAY is set. */
Damien Miller17e7ed02005-06-17 12:54:33 +10001028 display = getenv("DISPLAY");
1029 if (options.forward_x11 && display != NULL) {
Ben Lindstrom4a4bd712001-12-06 17:45:19 +00001030 char *proto, *data;
Damien Millerbd483e72000-04-30 10:00:53 +10001031 /* Get reasonable local authentication information. */
Damien Miller17e7ed02005-06-17 12:54:33 +10001032 client_x11_get_proto(display, options.xauth_location,
1033 options.forward_x11_trusted, &proto, &data);
Damien Millerbd483e72000-04-30 10:00:53 +10001034 /* Request forwarding with authentication spoofing. */
Darren Tuckerd6173c02008-06-13 04:52:53 +10001035 debug("Requesting X11 forwarding with authentication "
1036 "spoofing.");
Damien Miller17e7ed02005-06-17 12:54:33 +10001037 x11_request_forwarding_with_spoofing(0, display, proto, data);
Damien Miller95def091999-11-25 00:26:21 +11001038
1039 /* Read response from the server. */
Damien Millerdff50992002-01-22 23:16:32 +11001040 type = packet_read();
Damien Miller95def091999-11-25 00:26:21 +11001041 if (type == SSH_SMSG_SUCCESS) {
Damien Miller95def091999-11-25 00:26:21 +11001042 interactive = 1;
Damien Millerbd483e72000-04-30 10:00:53 +10001043 } else if (type == SSH_SMSG_FAILURE) {
Damien Miller996acd22003-04-09 20:59:48 +10001044 logit("Warning: Remote host denied X11 forwarding.");
Damien Millerbd483e72000-04-30 10:00:53 +10001045 } else {
Darren Tuckerd6173c02008-06-13 04:52:53 +10001046 packet_disconnect("Protocol error waiting for X11 "
1047 "forwarding");
Damien Millerbd483e72000-04-30 10:00:53 +10001048 }
Damien Miller95def091999-11-25 00:26:21 +11001049 }
1050 /* Tell the packet module whether this is an interactive session. */
Ben Lindstrombf555ba2001-01-18 02:04:35 +00001051 packet_set_interactive(interactive);
Damien Miller95def091999-11-25 00:26:21 +11001052
1053 /* Request authentication agent forwarding if appropriate. */
Damien Miller0bc1bd82000-11-13 22:57:25 +11001054 check_agent_present();
1055
Damien Miller95def091999-11-25 00:26:21 +11001056 if (options.forward_agent) {
1057 debug("Requesting authentication agent forwarding.");
1058 auth_request_forwarding();
1059
1060 /* Read response from the server. */
Damien Millerdff50992002-01-22 23:16:32 +11001061 type = packet_read();
Damien Miller48b03fc2002-01-22 23:11:40 +11001062 packet_check_eom();
Damien Miller95def091999-11-25 00:26:21 +11001063 if (type != SSH_SMSG_SUCCESS)
Damien Miller996acd22003-04-09 20:59:48 +10001064 logit("Warning: Remote host denied authentication agent forwarding.");
Damien Miller95def091999-11-25 00:26:21 +11001065 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001066
Damien Miller0bc1bd82000-11-13 22:57:25 +11001067 /* Initiate port forwardings. */
1068 ssh_init_forwarding();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001069
Darren Tuckerb776c852007-12-02 23:06:35 +11001070 /* Execute a local command */
1071 if (options.local_command != NULL &&
1072 options.permit_local_command)
1073 ssh_local_cmd(options.local_command);
1074
Darren Tucker9a2a6092008-07-04 12:53:50 +10001075 /*
1076 * If requested and we are not interested in replies to remote
1077 * forwarding requests, then let ssh continue in the background.
1078 */
1079 if (fork_after_authentication_flag &&
1080 (!options.exit_on_forward_failure ||
1081 options.num_remote_forwards == 0)) {
1082 fork_after_authentication_flag = 0;
Damien Miller5428f641999-11-25 11:54:57 +11001083 if (daemon(1, 1) < 0)
1084 fatal("daemon() failed: %.200s", strerror(errno));
Darren Tucker9a2a6092008-07-04 12:53:50 +10001085 }
Damien Miller5428f641999-11-25 11:54:57 +11001086
1087 /*
1088 * If a command was specified on the command line, execute the
1089 * command now. Otherwise request the server to start a shell.
1090 */
Damien Miller95def091999-11-25 00:26:21 +11001091 if (buffer_len(&command) > 0) {
1092 int len = buffer_len(&command);
1093 if (len > 900)
1094 len = 900;
Darren Tuckerd6173c02008-06-13 04:52:53 +10001095 debug("Sending command: %.*s", len,
1096 (u_char *)buffer_ptr(&command));
Damien Miller95def091999-11-25 00:26:21 +11001097 packet_start(SSH_CMSG_EXEC_CMD);
1098 packet_put_string(buffer_ptr(&command), buffer_len(&command));
1099 packet_send();
1100 packet_write_wait();
1101 } else {
1102 debug("Requesting shell.");
1103 packet_start(SSH_CMSG_EXEC_SHELL);
1104 packet_send();
1105 packet_write_wait();
1106 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001107
Damien Miller95def091999-11-25 00:26:21 +11001108 /* Enter the interactive session. */
Ben Lindstrom2b1f71b2001-06-05 20:32:21 +00001109 return client_loop(have_tty, tty_flag ?
1110 options.escape_char : SSH_ESCAPECHAR_NONE, 0);
Damien Miller1383bd82000-04-06 12:32:37 +10001111}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001112
Ben Lindstromf558cf62001-09-20 23:13:49 +00001113/* request pty/x11/agent/tcpfwd/shell for channel */
Ben Lindstrombba81212001-06-25 05:01:22 +00001114static void
Ben Lindstromf558cf62001-09-20 23:13:49 +00001115ssh_session2_setup(int id, void *arg)
Damien Miller1383bd82000-04-06 12:32:37 +10001116{
Damien Miller3756dce2004-06-18 01:17:29 +10001117 extern char **environ;
Damien Miller17e7ed02005-06-17 12:54:33 +10001118 const char *display;
Damien Miller0e220db2004-06-15 10:34:08 +10001119 int interactive = tty_flag;
Damien Miller17e7ed02005-06-17 12:54:33 +10001120
Damien Miller46d38de2005-07-17 17:02:09 +10001121 display = getenv("DISPLAY");
Damien Miller17e7ed02005-06-17 12:54:33 +10001122 if (options.forward_x11 && display != NULL) {
Ben Lindstrom4a4bd712001-12-06 17:45:19 +00001123 char *proto, *data;
Damien Millerbd483e72000-04-30 10:00:53 +10001124 /* Get reasonable local authentication information. */
Damien Miller17e7ed02005-06-17 12:54:33 +10001125 client_x11_get_proto(display, options.xauth_location,
1126 options.forward_x11_trusted, &proto, &data);
Damien Millerbd483e72000-04-30 10:00:53 +10001127 /* Request forwarding with authentication spoofing. */
Darren Tuckerd6173c02008-06-13 04:52:53 +10001128 debug("Requesting X11 forwarding with authentication "
1129 "spoofing.");
Damien Miller17e7ed02005-06-17 12:54:33 +10001130 x11_request_forwarding_with_spoofing(id, display, proto, data);
Ben Lindstrombf555ba2001-01-18 02:04:35 +00001131 interactive = 1;
Damien Millerbd483e72000-04-30 10:00:53 +10001132 /* XXX wait for reply */
1133 }
1134
Damien Miller0bc1bd82000-11-13 22:57:25 +11001135 check_agent_present();
1136 if (options.forward_agent) {
1137 debug("Requesting authentication agent forwarding.");
1138 channel_request_start(id, "auth-agent-req@openssh.com", 0);
1139 packet_send();
1140 }
1141
Damien Miller0e220db2004-06-15 10:34:08 +10001142 client_session2_setup(id, tty_flag, subsystem_flag, getenv("TERM"),
Damien Miller5771ed72008-05-19 15:35:33 +10001143 NULL, fileno(stdin), &command, environ);
Ben Lindstrom1e7d3062001-02-09 02:36:43 +00001144
Ben Lindstrombf555ba2001-01-18 02:04:35 +00001145 packet_set_interactive(interactive);
Damien Miller1383bd82000-04-06 12:32:37 +10001146}
1147
Ben Lindstromf558cf62001-09-20 23:13:49 +00001148/* open new channel for a session */
Ben Lindstrombba81212001-06-25 05:01:22 +00001149static int
Ben Lindstromf558cf62001-09-20 23:13:49 +00001150ssh_session2_open(void)
Damien Miller1383bd82000-04-06 12:32:37 +10001151{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001152 Channel *c;
1153 int window, packetmax, in, out, err;
Damien Millerad833b32000-08-23 10:46:23 +10001154
Damien Millercaf6dd62000-08-29 11:33:50 +11001155 if (stdin_null_flag) {
Ben Lindstrom31ca54a2001-02-09 02:11:24 +00001156 in = open(_PATH_DEVNULL, O_RDONLY);
Damien Millercaf6dd62000-08-29 11:33:50 +11001157 } else {
1158 in = dup(STDIN_FILENO);
1159 }
1160 out = dup(STDOUT_FILENO);
1161 err = dup(STDERR_FILENO);
1162
1163 if (in < 0 || out < 0 || err < 0)
1164 fatal("dup() in/out/err failed");
1165
Damien Miller69b69aa2000-10-28 14:19:58 +11001166 /* enable nonblocking unless tty */
1167 if (!isatty(in))
1168 set_nonblock(in);
1169 if (!isatty(out))
1170 set_nonblock(out);
1171 if (!isatty(err))
1172 set_nonblock(err);
1173
Damien Millere4340be2000-09-16 13:29:08 +11001174 window = CHAN_SES_WINDOW_DEFAULT;
1175 packetmax = CHAN_SES_PACKET_DEFAULT;
Damien Miller19a59452002-02-19 15:20:57 +11001176 if (tty_flag) {
1177 window >>= 1;
1178 packetmax >>= 1;
Damien Miller1383bd82000-04-06 12:32:37 +10001179 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001180 c = channel_new(
Damien Miller1383bd82000-04-06 12:32:37 +10001181 "session", SSH_CHANNEL_OPENING, in, out, err,
Damien Millere4340be2000-09-16 13:29:08 +11001182 window, packetmax, CHAN_EXTENDED_WRITE,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10001183 "client-session", /*nonblock*/0);
Damien Miller1383bd82000-04-06 12:32:37 +10001184
Ben Lindstromf558cf62001-09-20 23:13:49 +00001185 debug3("ssh_session2_open: channel_new: %d", c->self);
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001186
Ben Lindstrom5ec26452001-06-09 00:18:51 +00001187 channel_send_open(c->self);
Ben Lindstromf558cf62001-09-20 23:13:49 +00001188 if (!no_shell_flag)
Damien Millerb84886b2008-05-19 15:05:07 +10001189 channel_register_open_confirm(c->self,
1190 ssh_session2_setup, NULL);
Damien Miller1383bd82000-04-06 12:32:37 +10001191
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001192 return c->self;
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001193}
1194
Ben Lindstrombba81212001-06-25 05:01:22 +00001195static int
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001196ssh_session2(void)
1197{
Ben Lindstromf558cf62001-09-20 23:13:49 +00001198 int id = -1;
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001199
1200 /* XXX should be pre-session */
1201 ssh_init_forwarding();
1202
Ben Lindstromf558cf62001-09-20 23:13:49 +00001203 if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN))
1204 id = ssh_session2_open();
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001205
Darren Tucker8901fa92008-06-11 09:34:01 +10001206 /* If we don't expect to open a new session, then disallow it */
Damien Miller456e6f02008-11-03 19:20:10 +11001207 if (options.control_master == SSHCTL_MASTER_NO &&
1208 (datafellows & SSH_NEW_OPENSSH)) {
Darren Tucker8901fa92008-06-11 09:34:01 +10001209 debug("Requesting no-more-sessions@openssh.com");
1210 packet_start(SSH2_MSG_GLOBAL_REQUEST);
1211 packet_put_cstring("no-more-sessions@openssh.com");
1212 packet_put_char(0);
1213 packet_send();
1214 }
1215
Damien Millerd27b9472005-12-13 19:29:02 +11001216 /* Execute a local command */
1217 if (options.local_command != NULL &&
1218 options.permit_local_command)
1219 ssh_local_cmd(options.local_command);
1220
Damien Millerb3ce9fe2007-08-08 14:32:41 +10001221 /* Start listening for multiplex clients */
Damien Millerb1cbfa22008-05-19 16:00:08 +10001222 muxserver_listen();
Damien Millerb3ce9fe2007-08-08 14:32:41 +10001223
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001224 /* If requested, let ssh continue in the background. */
Darren Tucker9a2a6092008-07-04 12:53:50 +10001225 if (fork_after_authentication_flag) {
1226 fork_after_authentication_flag = 0;
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001227 if (daemon(1, 1) < 0)
1228 fatal("daemon() failed: %.200s", strerror(errno));
Darren Tucker9a2a6092008-07-04 12:53:50 +10001229 }
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001230
Ben Lindstrom2b1f71b2001-06-05 20:32:21 +00001231 return client_loop(tty_flag, tty_flag ?
1232 options.escape_char : SSH_ESCAPECHAR_NONE, id);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001233}
Damien Miller0bc1bd82000-11-13 22:57:25 +11001234
Ben Lindstrombba81212001-06-25 05:01:22 +00001235static void
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001236load_public_identity_files(void)
1237{
Damien Miller6b1d53c2006-03-31 23:13:21 +11001238 char *filename, *cp, thishost[NI_MAXHOST];
Darren Tuckerb4fbbc62007-12-02 23:16:32 +11001239 char *pwdir = NULL, *pwname = NULL;
Ben Lindstrom711b04a2001-08-06 21:12:42 +00001240 int i = 0;
Ben Lindstrom0936a5b2002-03-26 03:17:42 +00001241 Key *public;
Damien Miller6b1d53c2006-03-31 23:13:21 +11001242 struct passwd *pw;
Ben Lindstrom711b04a2001-08-06 21:12:42 +00001243#ifdef SMARTCARD
Ben Lindstrom0936a5b2002-03-26 03:17:42 +00001244 Key **keys;
1245
Ben Lindstromf7db3bb2001-08-06 21:35:51 +00001246 if (options.smartcard_device != NULL &&
Ben Lindstrom0936a5b2002-03-26 03:17:42 +00001247 options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
Damien Miller4dec5d72006-08-05 11:38:40 +10001248 (keys = sc_get_keys(options.smartcard_device, NULL)) != NULL) {
Ben Lindstrom0936a5b2002-03-26 03:17:42 +00001249 int count = 0;
1250 for (i = 0; keys[i] != NULL; i++) {
1251 count++;
Darren Tuckerd6173c02008-06-13 04:52:53 +10001252 memmove(&options.identity_files[1],
1253 &options.identity_files[0],
Ben Lindstrom0936a5b2002-03-26 03:17:42 +00001254 sizeof(char *) * (SSH_MAX_IDENTITY_FILES - 1));
Darren Tuckerd6173c02008-06-13 04:52:53 +10001255 memmove(&options.identity_keys[1],
1256 &options.identity_keys[0],
Ben Lindstrom0936a5b2002-03-26 03:17:42 +00001257 sizeof(Key *) * (SSH_MAX_IDENTITY_FILES - 1));
1258 options.num_identity_files++;
1259 options.identity_keys[0] = keys[i];
Damien Miller56a0bb02003-06-18 20:28:40 +10001260 options.identity_files[0] = sc_get_key_label(keys[i]);
Ben Lindstrom0936a5b2002-03-26 03:17:42 +00001261 }
Ben Lindstrom4f054602002-03-26 03:23:00 +00001262 if (options.num_identity_files > SSH_MAX_IDENTITY_FILES)
1263 options.num_identity_files = SSH_MAX_IDENTITY_FILES;
Ben Lindstrom0936a5b2002-03-26 03:17:42 +00001264 i = count;
1265 xfree(keys);
Ben Lindstrom711b04a2001-08-06 21:12:42 +00001266 }
Ben Lindstromffce1472001-08-06 21:57:31 +00001267#endif /* SMARTCARD */
Damien Miller6b1d53c2006-03-31 23:13:21 +11001268 if ((pw = getpwuid(original_real_uid)) == NULL)
1269 fatal("load_public_identity_files: getpwuid failed");
Darren Tuckere143f062007-12-02 23:21:16 +11001270 pwname = xstrdup(pw->pw_name);
1271 pwdir = xstrdup(pw->pw_dir);
Damien Miller6b1d53c2006-03-31 23:13:21 +11001272 if (gethostname(thishost, sizeof(thishost)) == -1)
1273 fatal("load_public_identity_files: gethostname: %s",
1274 strerror(errno));
Ben Lindstrom711b04a2001-08-06 21:12:42 +00001275 for (; i < options.num_identity_files; i++) {
Damien Miller6b1d53c2006-03-31 23:13:21 +11001276 cp = tilde_expand_filename(options.identity_files[i],
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001277 original_real_uid);
Darren Tuckerb4fbbc62007-12-02 23:16:32 +11001278 filename = percent_expand(cp, "d", pwdir,
1279 "u", pwname, "l", thishost, "h", host,
Damien Miller6b1d53c2006-03-31 23:13:21 +11001280 "r", options.user, (char *)NULL);
1281 xfree(cp);
Ben Lindstromd0fca422001-03-26 13:44:06 +00001282 public = key_load_public(filename, NULL);
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001283 debug("identity file %s type %d", filename,
1284 public ? public->type : -1);
1285 xfree(options.identity_files[i]);
1286 options.identity_files[i] = filename;
1287 options.identity_keys[i] = public;
1288 }
Darren Tuckerb4fbbc62007-12-02 23:16:32 +11001289 bzero(pwname, strlen(pwname));
Darren Tuckere143f062007-12-02 23:21:16 +11001290 xfree(pwname);
Darren Tuckerb4fbbc62007-12-02 23:16:32 +11001291 bzero(pwdir, strlen(pwdir));
Darren Tuckere143f062007-12-02 23:21:16 +11001292 xfree(pwdir);
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001293}