blob: adfe60e4b27dbdca755a185e10508b8b516adb32 [file] [log] [blame]
Darren Tucker199b1342009-07-06 07:16:56 +10001/* $OpenBSD: ssh.c,v 1.326 2009/07/02 02:11:47 dtucker Exp $ */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002/*
Damien Miller95def091999-11-25 00:26:21 +11003 * Author: Tatu Ylonen <ylo@cs.hut.fi>
4 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5 * All rights reserved
Damien Miller95def091999-11-25 00:26:21 +11006 * Ssh client program. This program can be used to log into a remote machine.
7 * The software supports strong authentication, encryption, and forwarding
8 * of X11, TCP/IP, and authentication connections.
9 *
Damien Millere4340be2000-09-16 13:29:08 +110010 * As far as I am concerned, the code I have written for this software
11 * can be used freely for any purpose. Any derived versions of this
12 * software must be clearly marked as such, and if the derived work is
13 * incompatible with the protocol description in the RFC file, it must be
14 * called by a name other than "ssh" or "Secure Shell".
15 *
16 * Copyright (c) 1999 Niels Provos. All rights reserved.
Darren Tucker0a118da2003-10-15 15:54:32 +100017 * Copyright (c) 2000, 2001, 2002, 2003 Markus Friedl. All rights reserved.
Damien Millere4340be2000-09-16 13:29:08 +110018 *
19 * Modified to work with SSL by Niels Provos <provos@citi.umich.edu>
20 * in Canada (German citizen).
21 *
22 * Redistribution and use in source and binary forms, with or without
23 * modification, are permitted provided that the following conditions
24 * are met:
25 * 1. Redistributions of source code must retain the above copyright
26 * notice, this list of conditions and the following disclaimer.
27 * 2. Redistributions in binary form must reproduce the above copyright
28 * notice, this list of conditions and the following disclaimer in the
29 * documentation and/or other materials provided with the distribution.
30 *
31 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
32 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
33 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
34 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
35 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
36 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
37 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
38 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
39 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
40 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Damien Miller95def091999-11-25 00:26:21 +110041 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100042
43#include "includes.h"
Damien Millercd4223c2006-03-15 11:22:47 +110044
Damien Millerf17883e2006-03-15 11:45:54 +110045#include <sys/types.h>
46#ifdef HAVE_SYS_STAT_H
47# include <sys/stat.h>
48#endif
Damien Millercd4223c2006-03-15 11:22:47 +110049#include <sys/resource.h>
Damien Miller17e91c02006-03-15 11:28:34 +110050#include <sys/ioctl.h>
Darren Tucker199b1342009-07-06 07:16:56 +100051#include <sys/param.h>
Damien Millere3b60b52006-07-10 21:08:03 +100052#include <sys/socket.h>
Damien Miller03e20032006-03-15 11:16:59 +110053
Damien Millerc7b06362006-03-15 11:53:45 +110054#include <ctype.h>
Darren Tuckerba724052006-07-12 22:24:22 +100055#include <errno.h>
Damien Miller57cf6382006-07-10 21:13:46 +100056#include <fcntl.h>
Damien Millerb8fe89c2006-07-24 14:51:00 +100057#include <netdb.h>
Damien Miller6645e7a2006-03-15 14:42:54 +110058#ifdef HAVE_PATHS_H
Damien Miller03e20032006-03-15 11:16:59 +110059#include <paths.h>
Damien Miller6645e7a2006-03-15 14:42:54 +110060#endif
Damien Miller9f2abc42006-07-10 20:53:08 +100061#include <pwd.h>
Damien Miller6ff3cad2006-03-15 11:52:09 +110062#include <signal.h>
Damien Millerded319c2006-09-01 15:38:36 +100063#include <stdarg.h>
Damien Miller2d00e632006-07-24 13:53:19 +100064#include <stddef.h>
Damien Millera7a73ee2006-08-05 11:37:59 +100065#include <stdio.h>
Damien Millere7a1e5c2006-08-05 11:34:19 +100066#include <stdlib.h>
Damien Millere3476ed2006-07-24 14:13:33 +100067#include <string.h>
Damien Millere6b3b612006-07-24 14:01:23 +100068#include <unistd.h>
Damien Millereba71ba2000-04-29 23:57:08 +100069
Darren Tucker46aa3e02006-09-02 15:32:40 +100070#include <netinet/in.h>
71#include <arpa/inet.h>
72
Damien Millereba71ba2000-04-29 23:57:08 +100073#include <openssl/evp.h>
Damien Miller0bc1bd82000-11-13 22:57:25 +110074#include <openssl/err.h>
Darren Tuckerbfaaf962008-02-28 19:13:52 +110075#include "openbsd-compat/openssl-compat.h"
Damien Millerb84886b2008-05-19 15:05:07 +100076#include "openbsd-compat/sys-queue.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100077
Damien Millerd7834352006-08-05 12:39:39 +100078#include "xmalloc.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100079#include "ssh.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000080#include "ssh1.h"
Damien Miller1383bd82000-04-06 12:32:37 +100081#include "ssh2.h"
82#include "compat.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000083#include "cipher.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000084#include "packet.h"
85#include "buffer.h"
Ben Lindstromc7637672001-06-09 00:36:26 +000086#include "channels.h"
Damien Millereba71ba2000-04-29 23:57:08 +100087#include "key.h"
Damien Miller994cf142000-07-21 10:19:44 +100088#include "authfd.h"
Damien Millereba71ba2000-04-29 23:57:08 +100089#include "authfile.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000090#include "pathnames.h"
Damien Miller0e220db2004-06-15 10:34:08 +100091#include "dispatch.h"
Ben Lindstrombf555ba2001-01-18 02:04:35 +000092#include "clientloop.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000093#include "log.h"
94#include "readconf.h"
95#include "sshconnect.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000096#include "misc.h"
Ben Lindstrom06b33aa2001-02-15 03:01:59 +000097#include "kex.h"
98#include "mac.h"
Darren Tucker06f2bd82004-05-13 16:06:46 +100099#include "sshpty.h"
Darren Tucker46bc0752004-05-02 22:11:30 +1000100#include "match.h"
Damien Miller0e220db2004-06-15 10:34:08 +1000101#include "msg.h"
Darren Tucker25f60a72004-08-15 17:23:34 +1000102#include "uidswap.h"
Damien Millerb7576772006-07-10 20:23:39 +1000103#include "version.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000104
Ben Lindstromc5b68002001-07-04 04:52:03 +0000105#ifdef SMARTCARD
Ben Lindstromc5b68002001-07-04 04:52:03 +0000106#include "scard.h"
Ben Lindstrombcc18082001-08-06 21:59:25 +0000107#endif
Ben Lindstromc5b68002001-07-04 04:52:03 +0000108
Damien Miller3f905871999-11-15 17:10:57 +1100109extern char *__progname;
Damien Miller3f905871999-11-15 17:10:57 +1100110
Darren Tuckerd6173c02008-06-13 04:52:53 +1000111/* Flag indicating whether debug mode is on. May be set on the command line. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000112int debug_flag = 0;
113
Damien Miller78928792000-04-12 20:17:38 +1000114/* Flag indicating whether a tty should be allocated */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000115int tty_flag = 0;
Ben Lindstrom4dccfa52000-12-28 16:40:05 +0000116int no_tty_flag = 0;
117int force_tty_flag = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000118
Damien Miller1383bd82000-04-06 12:32:37 +1000119/* don't exec a shell */
120int no_shell_flag = 0;
Damien Miller1383bd82000-04-06 12:32:37 +1000121
Damien Miller5428f641999-11-25 11:54:57 +1100122/*
123 * Flag indicating that nothing should be read from stdin. This can be set
124 * on the command line.
125 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000126int stdin_null_flag = 0;
127
Damien Miller5428f641999-11-25 11:54:57 +1100128/*
129 * Flag indicating that ssh should fork after authentication. This is useful
Ben Lindstromf666fec2002-06-06 19:51:58 +0000130 * so that the passphrase can be entered manually, and then ssh goes to the
Damien Miller5428f641999-11-25 11:54:57 +1100131 * background.
132 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000133int fork_after_authentication_flag = 0;
134
Damien Miller5428f641999-11-25 11:54:57 +1100135/*
136 * General data structure for command line options and options configurable
137 * in configuration files. See readconf.h.
138 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000139Options options;
140
Ben Lindstrom14f31ab2001-09-12 17:48:04 +0000141/* optional user configfile */
142char *config = NULL;
143
Damien Miller5428f641999-11-25 11:54:57 +1100144/*
145 * Name of the host we are connecting to. This is the name given on the
146 * command line, or the HostName specified for the user-supplied name in a
147 * configuration file.
148 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000149char *host;
150
151/* socket address the host resolves to */
Damien Miller34132e52000-01-14 15:45:46 +1100152struct sockaddr_storage hostaddr;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000153
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000154/* Private host keys. */
Ben Lindstrom1bad2562002-06-06 19:57:33 +0000155Sensitive sensitive_data;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000156
157/* Original real UID. */
158uid_t original_real_uid;
Ben Lindstromf9c48842002-06-11 16:37:51 +0000159uid_t original_effective_uid;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000160
Damien Miller1383bd82000-04-06 12:32:37 +1000161/* command to be executed */
162Buffer command;
163
Damien Miller832562e2001-01-30 09:30:01 +1100164/* Should we execute a command or invoke a subsystem? */
165int subsystem_flag = 0;
166
Damien Miller2797f7f2002-04-23 21:09:44 +1000167/* # of replies received for global requests */
Darren Tucker9f407c42008-06-13 04:50:27 +1000168static int remote_forward_confirms_received = 0;
Damien Miller2797f7f2002-04-23 21:09:44 +1000169
Damien Miller8c4e18a2002-09-19 12:05:02 +1000170/* pid of proxycommand child process */
171pid_t proxy_command_pid = 0;
172
Damien Millerb1cbfa22008-05-19 16:00:08 +1000173/* mux.c */
174extern int muxserver_sock;
175extern u_int muxclient_command;
Damien Miller0e220db2004-06-15 10:34:08 +1000176
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000177/* Prints a help message to the user. This function never returns. */
178
Ben Lindstrombba81212001-06-25 05:01:22 +0000179static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000180usage(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000181{
Damien Miller50955102004-03-22 09:34:58 +1100182 fprintf(stderr,
Damien Millerc13c3ee2008-11-03 19:23:28 +1100183"usage: ssh [-1246AaCfgKkMNnqsTtVvXxYy] [-b bind_address] [-c cipher_spec]\n"
Darren Tucker895d6982005-10-03 18:18:05 +1000184" [-D [bind_address:]port] [-e escape_char] [-F configfile]\n"
Damien Miller02faece2005-03-02 12:04:32 +1100185" [-i identity_file] [-L [bind_address:]port:host:hostport]\n"
Damien Millerf91ee4c2005-03-01 21:24:33 +1100186" [-l login_name] [-m mac_spec] [-O ctl_cmd] [-o option] [-p port]\n"
Damien Miller02faece2005-03-02 12:04:32 +1100187" [-R [bind_address:]port:host:hostport] [-S ctl_path]\n"
Damien Miller991dba42006-07-10 20:16:27 +1000188" [-w local_tun[:remote_tun]] [user@]hostname [command]\n"
Damien Miller50955102004-03-22 09:34:58 +1100189 );
Darren Tuckere9a9b712005-12-20 16:15:51 +1100190 exit(255);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000191}
192
Ben Lindstrombba81212001-06-25 05:01:22 +0000193static int ssh_session(void);
194static int ssh_session2(void);
195static void load_public_identity_files(void);
Damien Millerb1cbfa22008-05-19 16:00:08 +1000196
197/* from muxclient.c */
198void muxclient(const char *);
199void muxserver_listen(void);
Damien Miller1383bd82000-04-06 12:32:37 +1000200
Damien Miller95def091999-11-25 00:26:21 +1100201/*
202 * Main program for the ssh client.
203 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000204int
205main(int ac, char **av)
206{
Darren Tucker199b1342009-07-06 07:16:56 +1000207 int i, r, opt, exit_status, use_syslog;
208 char *p, *cp, *line, *argv0, buf[MAXPATHLEN];
Damien Miller95def091999-11-25 00:26:21 +1100209 struct stat st;
Ben Lindstrom086cf212001-03-05 05:56:40 +0000210 struct passwd *pw;
Damien Miller67bd0622007-09-17 12:06:57 +1000211 int dummy, timeout_ms;
Ben Lindstrom5ccf63a2001-09-24 20:00:10 +0000212 extern int optind, optreset;
Damien Miller4f8e6692001-07-14 13:22:53 +1000213 extern char *optarg;
Damien Miller9651fe62005-06-26 08:55:25 +1000214 struct servent *sp;
Damien Millerf91ee4c2005-03-01 21:24:33 +1100215 Forward fwd;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000216
Darren Tuckerce321d82005-10-03 18:11:24 +1000217 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
218 sanitise_stdfd();
219
Damien Miller59d3d5b2003-08-22 09:34:41 +1000220 __progname = ssh_get_progname(av[0]);
Damien Millerf9b625c2000-07-09 22:42:32 +1000221 init_rng();
222
Damien Miller5428f641999-11-25 11:54:57 +1100223 /*
224 * Save the original real uid. It will be needed later (uid-swapping
225 * may clobber the real uid).
226 */
Damien Miller95def091999-11-25 00:26:21 +1100227 original_real_uid = getuid();
228 original_effective_uid = geteuid();
Damien Millera8e06ce2003-11-21 23:48:55 +1100229
Damien Miller50b9a602002-09-04 16:50:06 +1000230 /*
231 * Use uid-swapping to give up root privileges for the duration of
232 * option processing. We will re-instantiate the rights when we are
233 * ready to create the privileged port, and will permanently drop
234 * them when the port has been created (actually, when the connection
235 * has been made, as we may need to create the port several times).
236 */
237 PRIV_END;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000238
Damien Miller05dd7952000-10-01 00:42:48 +1100239#ifdef HAVE_SETRLIMIT
Damien Miller95def091999-11-25 00:26:21 +1100240 /* If we are installed setuid root be careful to not drop core. */
241 if (original_real_uid != original_effective_uid) {
242 struct rlimit rlim;
243 rlim.rlim_cur = rlim.rlim_max = 0;
244 if (setrlimit(RLIMIT_CORE, &rlim) < 0)
245 fatal("setrlimit failed: %.100s", strerror(errno));
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000246 }
Damien Millerbac2d8a2000-09-05 16:13:06 +1100247#endif
Ben Lindstrom3fcf1a22001-04-08 18:26:59 +0000248 /* Get user data. */
249 pw = getpwuid(original_real_uid);
250 if (!pw) {
Damien Miller996acd22003-04-09 20:59:48 +1000251 logit("You don't exist, go away!");
Darren Tuckere9a9b712005-12-20 16:15:51 +1100252 exit(255);
Ben Lindstrom3fcf1a22001-04-08 18:26:59 +0000253 }
254 /* Take a copy of the returned structure. */
255 pw = pwcopy(pw);
256
Damien Miller5428f641999-11-25 11:54:57 +1100257 /*
Damien Miller5428f641999-11-25 11:54:57 +1100258 * Set our umask to something reasonable, as some files are created
259 * with the default umask. This will make them world-readable but
260 * writable only by the owner, which is ok for all files for which we
261 * don't set the modes explicitly.
262 */
Damien Miller95def091999-11-25 00:26:21 +1100263 umask(022);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000264
Darren Tuckerd6173c02008-06-13 04:52:53 +1000265 /*
266 * Initialize option structure to indicate that no values have been
267 * set.
268 */
Damien Miller95def091999-11-25 00:26:21 +1100269 initialize_options(&options);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000270
Damien Miller95def091999-11-25 00:26:21 +1100271 /* Parse command-line arguments. */
272 host = NULL;
Damien Millere272a5b2008-11-03 19:22:37 +1100273 use_syslog = 0;
Darren Tucker72efd742009-06-21 17:48:00 +1000274 argv0 = av[0];
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000275
Damien Miller2ecb6bd2006-03-15 12:03:53 +1100276 again:
Darren Tuckerd6173c02008-06-13 04:52:53 +1000277 while ((opt = getopt(ac, av, "1246ab:c:e:fgi:kl:m:no:p:qstvx"
Damien Millere272a5b2008-11-03 19:22:37 +1100278 "ACD:F:I:KL:MNO:PR:S:TVw:XYy")) != -1) {
Damien Miller95def091999-11-25 00:26:21 +1100279 switch (opt) {
Ben Lindstrom1e7d3062001-02-09 02:36:43 +0000280 case '1':
281 options.protocol = SSH_PROTO_1;
282 break;
Damien Miller4af51302000-04-16 11:18:38 +1000283 case '2':
284 options.protocol = SSH_PROTO_2;
285 break;
Damien Miller34132e52000-01-14 15:45:46 +1100286 case '4':
Darren Tucker0a4f04b2003-07-03 20:37:47 +1000287 options.address_family = AF_INET;
Damien Miller34132e52000-01-14 15:45:46 +1100288 break;
Damien Miller34132e52000-01-14 15:45:46 +1100289 case '6':
Darren Tucker0a4f04b2003-07-03 20:37:47 +1000290 options.address_family = AF_INET6;
Damien Miller34132e52000-01-14 15:45:46 +1100291 break;
Damien Miller95def091999-11-25 00:26:21 +1100292 case 'n':
293 stdin_null_flag = 1;
294 break;
Damien Miller95def091999-11-25 00:26:21 +1100295 case 'f':
296 fork_after_authentication_flag = 1;
297 stdin_null_flag = 1;
298 break;
Damien Miller95def091999-11-25 00:26:21 +1100299 case 'x':
300 options.forward_x11 = 0;
301 break;
Damien Miller95def091999-11-25 00:26:21 +1100302 case 'X':
303 options.forward_x11 = 1;
304 break;
Damien Millere272a5b2008-11-03 19:22:37 +1100305 case 'y':
306 use_syslog = 1;
307 break;
Darren Tucker0a118da2003-10-15 15:54:32 +1000308 case 'Y':
309 options.forward_x11 = 1;
310 options.forward_x11_trusted = 1;
311 break;
Damien Miller95def091999-11-25 00:26:21 +1100312 case 'g':
313 options.gateway_ports = 1;
314 break;
Darren Tucker7ebfc102004-11-07 20:06:19 +1100315 case 'O':
316 if (strcmp(optarg, "check") == 0)
Damien Millerb1cbfa22008-05-19 16:00:08 +1000317 muxclient_command = SSHMUX_COMMAND_ALIVE_CHECK;
Darren Tucker7ebfc102004-11-07 20:06:19 +1100318 else if (strcmp(optarg, "exit") == 0)
Damien Millerb1cbfa22008-05-19 16:00:08 +1000319 muxclient_command = SSHMUX_COMMAND_TERMINATE;
Darren Tucker7ebfc102004-11-07 20:06:19 +1100320 else
321 fatal("Invalid multiplex command.");
322 break;
Damien Miller147bba32002-09-04 16:46:06 +1000323 case 'P': /* deprecated */
Damien Miller95def091999-11-25 00:26:21 +1100324 options.use_privileged_port = 0;
325 break;
Damien Miller95def091999-11-25 00:26:21 +1100326 case 'a':
327 options.forward_agent = 0;
328 break;
Damien Millerb1715dc2000-05-30 13:44:51 +1000329 case 'A':
330 options.forward_agent = 1;
331 break;
Damien Miller95def091999-11-25 00:26:21 +1100332 case 'k':
Damien Millere0113cc2003-11-24 13:10:09 +1100333 options.gss_deleg_creds = 0;
Damien Miller95def091999-11-25 00:26:21 +1100334 break;
Darren Tucker415bddc2007-06-12 23:43:16 +1000335 case 'K':
336 options.gss_authentication = 1;
337 options.gss_deleg_creds = 1;
338 break;
Damien Miller95def091999-11-25 00:26:21 +1100339 case 'i':
340 if (stat(optarg, &st) < 0) {
Damien Millerf4614452001-07-14 12:18:10 +1000341 fprintf(stderr, "Warning: Identity file %s "
Damien Miller3eb48b62005-03-01 21:15:46 +1100342 "not accessible: %s.\n", optarg,
343 strerror(errno));
Damien Miller95def091999-11-25 00:26:21 +1100344 break;
345 }
Damien Millerf4614452001-07-14 12:18:10 +1000346 if (options.num_identity_files >=
347 SSH_MAX_IDENTITY_FILES)
348 fatal("Too many identity files specified "
349 "(max %d)", SSH_MAX_IDENTITY_FILES);
350 options.identity_files[options.num_identity_files++] =
351 xstrdup(optarg);
Damien Miller95def091999-11-25 00:26:21 +1100352 break;
Ben Lindstromc5b68002001-07-04 04:52:03 +0000353 case 'I':
354#ifdef SMARTCARD
Ben Lindstromf7db3bb2001-08-06 21:35:51 +0000355 options.smartcard_device = xstrdup(optarg);
Ben Lindstrombcc18082001-08-06 21:59:25 +0000356#else
Ben Lindstromc5b68002001-07-04 04:52:03 +0000357 fprintf(stderr, "no support for smartcards.\n");
Ben Lindstrombcc18082001-08-06 21:59:25 +0000358#endif
Ben Lindstromc5b68002001-07-04 04:52:03 +0000359 break;
Damien Miller95def091999-11-25 00:26:21 +1100360 case 't':
Ben Lindstrom4dccfa52000-12-28 16:40:05 +0000361 if (tty_flag)
362 force_tty_flag = 1;
Damien Miller95def091999-11-25 00:26:21 +1100363 tty_flag = 1;
364 break;
Damien Miller95def091999-11-25 00:26:21 +1100365 case 'v':
Darren Tuckere98dfa32003-07-19 19:54:31 +1000366 if (debug_flag == 0) {
Damien Millere4340be2000-09-16 13:29:08 +1100367 debug_flag = 1;
368 options.log_level = SYSLOG_LEVEL_DEBUG1;
Darren Tuckere98dfa32003-07-19 19:54:31 +1000369 } else {
370 if (options.log_level < SYSLOG_LEVEL_DEBUG3)
371 options.log_level++;
Damien Millere4340be2000-09-16 13:29:08 +1100372 break;
Darren Tuckere98dfa32003-07-19 19:54:31 +1000373 }
Darren Tuckere9bf9842004-11-05 20:05:32 +1100374 /* FALLTHROUGH */
Damien Miller95def091999-11-25 00:26:21 +1100375 case 'V':
Damien Miller0c889cd2004-03-22 09:36:00 +1100376 fprintf(stderr, "%s, %s\n",
Damien Miller2aa6d3c2004-09-12 16:53:04 +1000377 SSH_RELEASE, SSLeay_version(SSLEAY_VERSION));
Damien Miller95def091999-11-25 00:26:21 +1100378 if (opt == 'V')
379 exit(0);
Damien Miller95def091999-11-25 00:26:21 +1100380 break;
Damien Millerd27b9472005-12-13 19:29:02 +1100381 case 'w':
Damien Miller7b58e802005-12-13 19:33:19 +1100382 if (options.tun_open == -1)
383 options.tun_open = SSH_TUNMODE_DEFAULT;
Damien Millerd27b9472005-12-13 19:29:02 +1100384 options.tun_local = a2tun(optarg, &options.tun_remote);
Damien Miller7b58e802005-12-13 19:33:19 +1100385 if (options.tun_local == SSH_TUNID_ERR) {
Darren Tuckerd6173c02008-06-13 04:52:53 +1000386 fprintf(stderr,
387 "Bad tun device '%s'\n", optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100388 exit(255);
Damien Millerd27b9472005-12-13 19:29:02 +1100389 }
390 break;
Damien Miller95def091999-11-25 00:26:21 +1100391 case 'q':
392 options.log_level = SYSLOG_LEVEL_QUIET;
393 break;
Damien Miller95def091999-11-25 00:26:21 +1100394 case 'e':
395 if (optarg[0] == '^' && optarg[2] == 0 &&
Damien Millerf4614452001-07-14 12:18:10 +1000396 (u_char) optarg[1] >= 64 &&
397 (u_char) optarg[1] < 128)
Ben Lindstrom46c16222000-12-22 01:43:59 +0000398 options.escape_char = (u_char) optarg[1] & 31;
Damien Miller95def091999-11-25 00:26:21 +1100399 else if (strlen(optarg) == 1)
Ben Lindstrom46c16222000-12-22 01:43:59 +0000400 options.escape_char = (u_char) optarg[0];
Damien Miller95def091999-11-25 00:26:21 +1100401 else if (strcmp(optarg, "none") == 0)
Ben Lindstrom2b1f71b2001-06-05 20:32:21 +0000402 options.escape_char = SSH_ESCAPECHAR_NONE;
Damien Miller95def091999-11-25 00:26:21 +1100403 else {
Damien Millerf4614452001-07-14 12:18:10 +1000404 fprintf(stderr, "Bad escape character '%s'.\n",
405 optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100406 exit(255);
Damien Miller95def091999-11-25 00:26:21 +1100407 }
408 break;
Damien Miller95def091999-11-25 00:26:21 +1100409 case 'c':
Damien Millereba71ba2000-04-29 23:57:08 +1000410 if (ciphers_valid(optarg)) {
411 /* SSH2 only */
412 options.ciphers = xstrdup(optarg);
Darren Tucker5cb30ad2004-08-12 22:40:24 +1000413 options.cipher = SSH_CIPHER_INVALID;
Damien Millereba71ba2000-04-29 23:57:08 +1000414 } else {
415 /* SSH1 only */
Damien Millere39cacc2000-11-29 12:18:44 +1100416 options.cipher = cipher_number(optarg);
417 if (options.cipher == -1) {
Damien Millerf4614452001-07-14 12:18:10 +1000418 fprintf(stderr,
419 "Unknown cipher type '%s'\n",
420 optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100421 exit(255);
Damien Millereba71ba2000-04-29 23:57:08 +1000422 }
Damien Millerf4614452001-07-14 12:18:10 +1000423 if (options.cipher == SSH_CIPHER_3DES)
Damien Millere39cacc2000-11-29 12:18:44 +1100424 options.ciphers = "3des-cbc";
Damien Millerf4614452001-07-14 12:18:10 +1000425 else if (options.cipher == SSH_CIPHER_BLOWFISH)
Damien Millere39cacc2000-11-29 12:18:44 +1100426 options.ciphers = "blowfish-cbc";
Damien Millerf4614452001-07-14 12:18:10 +1000427 else
Damien Millere39cacc2000-11-29 12:18:44 +1100428 options.ciphers = (char *)-1;
Damien Miller95def091999-11-25 00:26:21 +1100429 }
430 break;
Ben Lindstrom06b33aa2001-02-15 03:01:59 +0000431 case 'm':
432 if (mac_valid(optarg))
433 options.macs = xstrdup(optarg);
434 else {
Damien Millerf4614452001-07-14 12:18:10 +1000435 fprintf(stderr, "Unknown mac type '%s'\n",
436 optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100437 exit(255);
Ben Lindstrom06b33aa2001-02-15 03:01:59 +0000438 }
439 break;
Damien Miller0e220db2004-06-15 10:34:08 +1000440 case 'M':
Damien Millerd14b1e72005-06-16 13:19:41 +1000441 if (options.control_master == SSHCTL_MASTER_YES)
442 options.control_master = SSHCTL_MASTER_ASK;
443 else
444 options.control_master = SSHCTL_MASTER_YES;
Damien Miller0e220db2004-06-15 10:34:08 +1000445 break;
Damien Miller95def091999-11-25 00:26:21 +1100446 case 'p':
Ben Lindstrom19066a12001-04-12 23:39:26 +0000447 options.port = a2port(optarg);
Damien Miller3dc71ad2009-01-28 16:31:22 +1100448 if (options.port <= 0) {
Ben Lindstrom146edb92001-04-11 23:06:28 +0000449 fprintf(stderr, "Bad port '%s'\n", optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100450 exit(255);
Ben Lindstrom146edb92001-04-11 23:06:28 +0000451 }
Damien Miller95def091999-11-25 00:26:21 +1100452 break;
Damien Miller95def091999-11-25 00:26:21 +1100453 case 'l':
454 options.user = optarg;
455 break;
Ben Lindstrom1a174712001-09-12 17:56:15 +0000456
Damien Miller95def091999-11-25 00:26:21 +1100457 case 'L':
Damien Miller4bf648f2009-02-14 16:28:21 +1100458 if (parse_forward(&fwd, optarg, 0, 0))
Damien Millerf91ee4c2005-03-01 21:24:33 +1100459 add_local_forward(&options, &fwd);
460 else {
Damien Millerf4614452001-07-14 12:18:10 +1000461 fprintf(stderr,
Damien Millerf91ee4c2005-03-01 21:24:33 +1100462 "Bad local forwarding specification '%s'\n",
Damien Millerf4614452001-07-14 12:18:10 +1000463 optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100464 exit(255);
Ben Lindstrom1a174712001-09-12 17:56:15 +0000465 }
Damien Millerf91ee4c2005-03-01 21:24:33 +1100466 break;
467
468 case 'R':
Damien Miller4bf648f2009-02-14 16:28:21 +1100469 if (parse_forward(&fwd, optarg, 0, 1)) {
Damien Millerf91ee4c2005-03-01 21:24:33 +1100470 add_remote_forward(&options, &fwd);
471 } else {
472 fprintf(stderr,
473 "Bad remote forwarding specification "
474 "'%s'\n", optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100475 exit(255);
Damien Millerf91ee4c2005-03-01 21:24:33 +1100476 }
Damien Miller95def091999-11-25 00:26:21 +1100477 break;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000478
479 case 'D':
Damien Miller4bf648f2009-02-14 16:28:21 +1100480 if (parse_forward(&fwd, optarg, 1, 0)) {
Damien Millera699d952008-11-03 19:27:34 +1100481 add_local_forward(&options, &fwd);
Damien Millerf91ee4c2005-03-01 21:24:33 +1100482 } else {
Damien Millera699d952008-11-03 19:27:34 +1100483 fprintf(stderr,
484 "Bad dynamic forwarding specification "
485 "'%s'\n", optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100486 exit(255);
Ben Lindstrom146edb92001-04-11 23:06:28 +0000487 }
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000488 break;
489
Damien Miller95def091999-11-25 00:26:21 +1100490 case 'C':
491 options.compression = 1;
492 break;
Damien Miller1383bd82000-04-06 12:32:37 +1000493 case 'N':
494 no_shell_flag = 1;
495 no_tty_flag = 1;
496 break;
Damien Miller1383bd82000-04-06 12:32:37 +1000497 case 'T':
498 no_tty_flag = 1;
499 break;
Damien Miller95def091999-11-25 00:26:21 +1100500 case 'o':
501 dummy = 1;
Damien Miller9836cf82003-12-17 16:30:06 +1100502 line = xstrdup(optarg);
Damien Millerf4614452001-07-14 12:18:10 +1000503 if (process_config_line(&options, host ? host : "",
Damien Miller9836cf82003-12-17 16:30:06 +1100504 line, "command-line", 0, &dummy) != 0)
Darren Tuckere9a9b712005-12-20 16:15:51 +1100505 exit(255);
Damien Miller9836cf82003-12-17 16:30:06 +1100506 xfree(line);
Damien Miller95def091999-11-25 00:26:21 +1100507 break;
Damien Miller832562e2001-01-30 09:30:01 +1100508 case 's':
509 subsystem_flag = 1;
510 break;
Damien Miller0e220db2004-06-15 10:34:08 +1000511 case 'S':
512 if (options.control_path != NULL)
513 free(options.control_path);
514 options.control_path = xstrdup(optarg);
Damien Miller0e220db2004-06-15 10:34:08 +1000515 break;
Ben Lindstrome0f88042001-04-30 13:06:24 +0000516 case 'b':
517 options.bind_address = optarg;
518 break;
Ben Lindstrom14f31ab2001-09-12 17:48:04 +0000519 case 'F':
520 config = optarg;
521 break;
Damien Miller95def091999-11-25 00:26:21 +1100522 default:
523 usage();
524 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000525 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000526
Damien Millerf4614452001-07-14 12:18:10 +1000527 ac -= optind;
528 av += optind;
529
530 if (ac > 0 && !host && **av != '-') {
Ben Lindstromc276c122002-12-23 02:14:51 +0000531 if (strrchr(*av, '@')) {
Damien Millerf4614452001-07-14 12:18:10 +1000532 p = xstrdup(*av);
Ben Lindstromc276c122002-12-23 02:14:51 +0000533 cp = strrchr(p, '@');
Damien Millerf4614452001-07-14 12:18:10 +1000534 if (cp == NULL || cp == p)
535 usage();
536 options.user = p;
537 *cp = '\0';
538 host = ++cp;
539 } else
540 host = *av;
Ben Lindstromb9fa6912002-12-23 02:24:54 +0000541 if (ac > 1) {
542 optind = optreset = 1;
Damien Millerf4614452001-07-14 12:18:10 +1000543 goto again;
544 }
Ben Lindstromb9fa6912002-12-23 02:24:54 +0000545 ac--, av++;
Damien Millerf4614452001-07-14 12:18:10 +1000546 }
547
Damien Miller95def091999-11-25 00:26:21 +1100548 /* Check that we got a host name. */
549 if (!host)
550 usage();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000551
Damien Millercb5e44a2000-09-29 12:12:36 +1100552 SSLeay_add_all_algorithms();
Damien Miller0bc1bd82000-11-13 22:57:25 +1100553 ERR_load_crypto_strings();
Damien Millercb5e44a2000-09-29 12:12:36 +1100554
Damien Miller95def091999-11-25 00:26:21 +1100555 /* Initialize the command to execute on remote host. */
556 buffer_init(&command);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000557
Damien Miller5428f641999-11-25 11:54:57 +1100558 /*
559 * Save the command to execute on the remote host in a buffer. There
560 * is no limit on the length of the command, except by the maximum
561 * packet size. Also sets the tty flag if there is no command.
562 */
Damien Millerf4614452001-07-14 12:18:10 +1000563 if (!ac) {
Damien Miller95def091999-11-25 00:26:21 +1100564 /* No command specified - execute shell on a tty. */
565 tty_flag = 1;
Damien Miller832562e2001-01-30 09:30:01 +1100566 if (subsystem_flag) {
Damien Millerf4614452001-07-14 12:18:10 +1000567 fprintf(stderr,
568 "You must specify a subsystem to invoke.\n");
Damien Miller832562e2001-01-30 09:30:01 +1100569 usage();
570 }
Damien Miller95def091999-11-25 00:26:21 +1100571 } else {
Damien Millerf4614452001-07-14 12:18:10 +1000572 /* A command has been specified. Store it into the buffer. */
573 for (i = 0; i < ac; i++) {
574 if (i)
Damien Miller95def091999-11-25 00:26:21 +1100575 buffer_append(&command, " ", 1);
576 buffer_append(&command, av[i], strlen(av[i]));
577 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000578 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000579
Damien Miller95def091999-11-25 00:26:21 +1100580 /* Cannot fork to background if no command. */
Darren Tuckerd6173c02008-06-13 04:52:53 +1000581 if (fork_after_authentication_flag && buffer_len(&command) == 0 &&
582 !no_shell_flag)
583 fatal("Cannot fork into background without a command "
584 "to execute.");
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000585
Damien Miller95def091999-11-25 00:26:21 +1100586 /* Allocate a tty by default if no command specified. */
587 if (buffer_len(&command) == 0)
588 tty_flag = 1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000589
Ben Lindstroma962c2f2002-07-04 00:14:17 +0000590 /* Force no tty */
Ben Lindstromc72745a2000-12-02 19:03:54 +0000591 if (no_tty_flag)
592 tty_flag = 0;
Damien Miller95def091999-11-25 00:26:21 +1100593 /* Do not allocate a tty if stdin is not a tty. */
Damien Millerddee5752005-05-26 12:05:05 +1000594 if ((!isatty(fileno(stdin)) || stdin_null_flag) && !force_tty_flag) {
Damien Miller95def091999-11-25 00:26:21 +1100595 if (tty_flag)
Darren Tuckerd6173c02008-06-13 04:52:53 +1000596 logit("Pseudo-terminal will not be allocated because "
597 "stdin is not a terminal.");
Damien Miller95def091999-11-25 00:26:21 +1100598 tty_flag = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000599 }
Damien Miller1383bd82000-04-06 12:32:37 +1000600
Ben Lindstrom8a432f52001-03-05 07:24:46 +0000601 /*
602 * Initialize "log" output. Since we are the client all output
603 * actually goes to stderr.
604 */
Darren Tucker72efd742009-06-21 17:48:00 +1000605 log_init(argv0,
Darren Tuckerd6173c02008-06-13 04:52:53 +1000606 options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level,
Damien Millere272a5b2008-11-03 19:22:37 +1100607 SYSLOG_FACILITY_USER, !use_syslog);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000608
Ben Lindstrom14f31ab2001-09-12 17:48:04 +0000609 /*
610 * Read per-user configuration file. Ignore the system wide config
611 * file if the user specifies a config file on the command line.
612 */
613 if (config != NULL) {
Damien Miller914420f2004-04-20 20:14:07 +1000614 if (!read_config_file(config, host, &options, 0))
Ben Lindstromedc0cf22001-09-12 18:32:20 +0000615 fatal("Can't open user config file %.100s: "
616 "%.100s", config, strerror(errno));
Damien Miller80163902007-01-05 16:30:16 +1100617 } else {
Darren Tucker199b1342009-07-06 07:16:56 +1000618 r = snprintf(buf, sizeof buf, "%s/%s", pw->pw_dir,
Ben Lindstrom14f31ab2001-09-12 17:48:04 +0000619 _PATH_SSH_USER_CONFFILE);
Darren Tucker199b1342009-07-06 07:16:56 +1000620 if (r > 0 && (size_t)r < sizeof(buf))
621 (void)read_config_file(buf, host, &options, 1);
Ben Lindstrom83f07d12001-10-03 17:22:29 +0000622
623 /* Read systemwide configuration file after use config. */
Darren Tuckerfc959702004-07-17 16:12:08 +1000624 (void)read_config_file(_PATH_HOST_CONFIG_FILE, host,
Damien Miller57a44762004-04-20 20:11:57 +1000625 &options, 0);
Ben Lindstrom14f31ab2001-09-12 17:48:04 +0000626 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000627
Damien Miller95def091999-11-25 00:26:21 +1100628 /* Fill configuration defaults. */
629 fill_default_options(&options);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000630
Darren Tucker0a4f04b2003-07-03 20:37:47 +1000631 channel_set_af(options.address_family);
632
Damien Miller95def091999-11-25 00:26:21 +1100633 /* reinit */
Darren Tucker72efd742009-06-21 17:48:00 +1000634 log_init(argv0, options.log_level, SYSLOG_FACILITY_USER, !use_syslog);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000635
Damien Miller60bc5172001-03-19 09:38:15 +1100636 seed_rng();
637
Damien Miller95def091999-11-25 00:26:21 +1100638 if (options.user == NULL)
639 options.user = xstrdup(pw->pw_name);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000640
Darren Tuckerf6b01b72008-06-13 04:56:37 +1000641 /* Get default port if port has not been set. */
642 if (options.port == 0) {
643 sp = getservbyname(SSH_SERVICE_NAME, "tcp");
644 options.port = sp ? ntohs(sp->s_port) : SSH_DEFAULT_PORT;
645 }
646
647 if (options.local_command != NULL) {
648 char thishost[NI_MAXHOST];
649
650 if (gethostname(thishost, sizeof(thishost)) == -1)
651 fatal("gethostname: %s", strerror(errno));
652 snprintf(buf, sizeof(buf), "%d", options.port);
653 debug3("expanding LocalCommand: %s", options.local_command);
654 cp = options.local_command;
655 options.local_command = percent_expand(cp, "d", pw->pw_dir,
656 "h", options.hostname? options.hostname : host,
657 "l", thishost, "n", host, "r", options.user, "p", buf,
658 "u", pw->pw_name, (char *)NULL);
659 debug3("expanded LocalCommand: %s", options.local_command);
660 xfree(cp);
661 }
662
Damien Miller95def091999-11-25 00:26:21 +1100663 if (options.hostname != NULL)
664 host = options.hostname;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000665
Darren Tucker3f521e22003-07-03 16:20:42 +1000666 /* force lowercase for hostkey matching */
667 if (options.host_key_alias != NULL) {
668 for (p = options.host_key_alias; *p; p++)
669 if (isupper(*p))
Damien Miller1d2b6702006-03-26 14:09:54 +1100670 *p = (char)tolower(*p);
Darren Tucker3f521e22003-07-03 16:20:42 +1000671 }
672
Damien Miller9f1e33a2003-02-24 11:57:32 +1100673 if (options.proxy_command != NULL &&
Darren Tucker32e42c72007-12-02 23:01:03 +1100674 strcmp(options.proxy_command, "none") == 0) {
675 xfree(options.proxy_command);
Damien Miller9f1e33a2003-02-24 11:57:32 +1100676 options.proxy_command = NULL;
Darren Tucker32e42c72007-12-02 23:01:03 +1100677 }
Damien Miller8f74c8f2005-06-26 08:56:03 +1000678 if (options.control_path != NULL &&
Darren Tucker32e42c72007-12-02 23:01:03 +1100679 strcmp(options.control_path, "none") == 0) {
680 xfree(options.control_path);
Damien Miller8f74c8f2005-06-26 08:56:03 +1000681 options.control_path = NULL;
Darren Tucker32e42c72007-12-02 23:01:03 +1100682 }
Damien Miller9f1e33a2003-02-24 11:57:32 +1100683
Damien Miller0e220db2004-06-15 10:34:08 +1000684 if (options.control_path != NULL) {
Damien Miller6b1d53c2006-03-31 23:13:21 +1100685 char thishost[NI_MAXHOST];
Damien Miller3ec54c72006-03-15 11:30:13 +1100686
Damien Miller6b1d53c2006-03-31 23:13:21 +1100687 if (gethostname(thishost, sizeof(thishost)) == -1)
Damien Miller3ec54c72006-03-15 11:30:13 +1100688 fatal("gethostname: %s", strerror(errno));
Damien Miller6476cad2005-06-16 13:18:34 +1000689 snprintf(buf, sizeof(buf), "%d", options.port);
690 cp = tilde_expand_filename(options.control_path,
691 original_real_uid);
Darren Tucker32e42c72007-12-02 23:01:03 +1100692 xfree(options.control_path);
Damien Miller6476cad2005-06-16 13:18:34 +1000693 options.control_path = percent_expand(cp, "p", buf, "h", host,
Damien Miller6b1d53c2006-03-31 23:13:21 +1100694 "r", options.user, "l", thishost, (char *)NULL);
Damien Miller6476cad2005-06-16 13:18:34 +1000695 xfree(cp);
Damien Miller0e220db2004-06-15 10:34:08 +1000696 }
Damien Millerb1cbfa22008-05-19 16:00:08 +1000697 if (muxclient_command != 0 && options.control_path == NULL)
Darren Tucker0814d312005-06-01 23:08:51 +1000698 fatal("No ControlPath specified for \"-O\" command");
Damien Millerd14b1e72005-06-16 13:19:41 +1000699 if (options.control_path != NULL)
Damien Millerb1cbfa22008-05-19 16:00:08 +1000700 muxclient(options.control_path);
Damien Miller0e220db2004-06-15 10:34:08 +1000701
Damien Miller67bd0622007-09-17 12:06:57 +1000702 timeout_ms = options.connection_timeout * 1000;
703
Kevin Stevesfcec7f82000-12-15 19:55:48 +0000704 /* Open a connection to the remote host. */
Darren Tucker0a4f04b2003-07-03 20:37:47 +1000705 if (ssh_connect(host, &hostaddr, options.port,
Damien Miller67bd0622007-09-17 12:06:57 +1000706 options.address_family, options.connection_attempts, &timeout_ms,
707 options.tcp_keep_alive,
Ben Lindstrom1aa64272002-06-11 20:28:05 +0000708#ifdef HAVE_CYGWIN
709 options.use_privileged_port,
710#else
Ben Lindstromf9c48842002-06-11 16:37:51 +0000711 original_effective_uid == 0 && options.use_privileged_port,
Ben Lindstrom1aa64272002-06-11 20:28:05 +0000712#endif
Ben Lindstromda394ca2002-06-12 16:11:12 +0000713 options.proxy_command) != 0)
Darren Tuckere9a9b712005-12-20 16:15:51 +1100714 exit(255);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000715
Damien Miller67bd0622007-09-17 12:06:57 +1000716 if (timeout_ms > 0)
717 debug3("timeout: %d ms remain after connect", timeout_ms);
718
Damien Miller5428f641999-11-25 11:54:57 +1100719 /*
720 * If we successfully made the connection, load the host private key
721 * in case we will need it later for combined rsa-rhosts
722 * authentication. This must be done before releasing extra
723 * privileges, because the file is only readable by root.
Ben Lindstrom9e5bb572002-06-06 19:58:27 +0000724 * If we cannot access the private keys, load the public keys
725 * instead and try to execute the ssh-keysign helper instead.
Damien Miller5428f641999-11-25 11:54:57 +1100726 */
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000727 sensitive_data.nkeys = 0;
728 sensitive_data.keys = NULL;
Ben Lindstrom1bad2562002-06-06 19:57:33 +0000729 sensitive_data.external_keysign = 0;
Ben Lindstrom24157572002-06-12 16:09:39 +0000730 if (options.rhosts_rsa_authentication ||
731 options.hostbased_authentication) {
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000732 sensitive_data.nkeys = 3;
Damien Millerddd63ab2006-03-31 23:10:51 +1100733 sensitive_data.keys = xcalloc(sensitive_data.nkeys,
Ben Lindstroma962c2f2002-07-04 00:14:17 +0000734 sizeof(Key));
Ben Lindstromf9c48842002-06-11 16:37:51 +0000735
736 PRIV_START;
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000737 sensitive_data.keys[0] = key_load_private_type(KEY_RSA1,
Darren Tucker232b76f2006-05-06 17:41:51 +1000738 _PATH_HOST_KEY_FILE, "", NULL, NULL);
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000739 sensitive_data.keys[1] = key_load_private_type(KEY_DSA,
Darren Tucker232b76f2006-05-06 17:41:51 +1000740 _PATH_HOST_DSA_KEY_FILE, "", NULL, NULL);
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000741 sensitive_data.keys[2] = key_load_private_type(KEY_RSA,
Darren Tucker232b76f2006-05-06 17:41:51 +1000742 _PATH_HOST_RSA_KEY_FILE, "", NULL, NULL);
Ben Lindstromf9c48842002-06-11 16:37:51 +0000743 PRIV_END;
Ben Lindstrom1bad2562002-06-06 19:57:33 +0000744
Ben Lindstrom5d35a2f2002-07-04 00:19:40 +0000745 if (options.hostbased_authentication == 1 &&
746 sensitive_data.keys[0] == NULL &&
Ben Lindstrom1bad2562002-06-06 19:57:33 +0000747 sensitive_data.keys[1] == NULL &&
748 sensitive_data.keys[2] == NULL) {
749 sensitive_data.keys[1] = key_load_public(
750 _PATH_HOST_DSA_KEY_FILE, NULL);
751 sensitive_data.keys[2] = key_load_public(
752 _PATH_HOST_RSA_KEY_FILE, NULL);
753 sensitive_data.external_keysign = 1;
754 }
Damien Miller95def091999-11-25 00:26:21 +1100755 }
Damien Miller5428f641999-11-25 11:54:57 +1100756 /*
757 * Get rid of any extra privileges that we may have. We will no
758 * longer need them. Also, extra privileges could make it very hard
759 * to read identity files and other non-world-readable files from the
760 * user's home directory if it happens to be on a NFS volume where
761 * root is mapped to nobody.
762 */
Darren Tucker25f60a72004-08-15 17:23:34 +1000763 if (original_effective_uid == 0) {
764 PRIV_START;
765 permanently_set_uid(pw);
766 }
Damien Miller95def091999-11-25 00:26:21 +1100767
Damien Miller5428f641999-11-25 11:54:57 +1100768 /*
769 * Now that we are back to our own permissions, create ~/.ssh
Damien Miller788f2122005-11-05 15:14:59 +1100770 * directory if it doesn't already exist.
Damien Miller5428f641999-11-25 11:54:57 +1100771 */
Darren Tucker199b1342009-07-06 07:16:56 +1000772 r = snprintf(buf, sizeof buf, "%s%s%s", pw->pw_dir,
Darren Tuckerd6173c02008-06-13 04:52:53 +1000773 strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR);
Darren Tucker199b1342009-07-06 07:16:56 +1000774 if (r > 0 && (size_t)r < sizeof(buf) && stat(buf, &st) < 0)
Damien Millerbe484b52000-07-15 14:14:16 +1000775 if (mkdir(buf, 0700) < 0)
Damien Miller95def091999-11-25 00:26:21 +1100776 error("Could not create directory '%.200s'.", buf);
777
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000778 /* load options.identity_files */
779 load_public_identity_files();
780
781 /* Expand ~ in known host file names. */
782 /* XXX mem-leaks: */
Damien Miller0bc1bd82000-11-13 22:57:25 +1100783 options.system_hostfile =
784 tilde_expand_filename(options.system_hostfile, original_real_uid);
785 options.user_hostfile =
786 tilde_expand_filename(options.user_hostfile, original_real_uid);
787 options.system_hostfile2 =
788 tilde_expand_filename(options.system_hostfile2, original_real_uid);
789 options.user_hostfile2 =
790 tilde_expand_filename(options.user_hostfile2, original_real_uid);
Damien Miller95def091999-11-25 00:26:21 +1100791
Damien Miller07cd5892001-11-12 10:52:03 +1100792 signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
793
Darren Tuckerd6173c02008-06-13 04:52:53 +1000794 /* Log into the remote system. Never returns if the login fails. */
Damien Miller67bd0622007-09-17 12:06:57 +1000795 ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr,
796 pw, timeout_ms);
Damien Miller95def091999-11-25 00:26:21 +1100797
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000798 /* We no longer need the private host keys. Clear them now. */
799 if (sensitive_data.nkeys != 0) {
800 for (i = 0; i < sensitive_data.nkeys; i++) {
801 if (sensitive_data.keys[i] != NULL) {
802 /* Destroys contents safely */
803 debug3("clear hostkey %d", i);
804 key_free(sensitive_data.keys[i]);
805 sensitive_data.keys[i] = NULL;
806 }
807 }
808 xfree(sensitive_data.keys);
809 }
Ben Lindstroma6c8a8d2001-08-06 21:42:00 +0000810 for (i = 0; i < options.num_identity_files; i++) {
811 if (options.identity_files[i]) {
812 xfree(options.identity_files[i]);
813 options.identity_files[i] = NULL;
814 }
815 if (options.identity_keys[i]) {
816 key_free(options.identity_keys[i]);
817 options.identity_keys[i] = NULL;
818 }
819 }
Damien Miller95def091999-11-25 00:26:21 +1100820
Damien Miller1383bd82000-04-06 12:32:37 +1000821 exit_status = compat20 ? ssh_session2() : ssh_session();
822 packet_close();
Damien Miller8c4e18a2002-09-19 12:05:02 +1000823
Damien Millerb1cbfa22008-05-19 16:00:08 +1000824 if (options.control_path != NULL && muxserver_sock != -1)
Damien Miller0e220db2004-06-15 10:34:08 +1000825 unlink(options.control_path);
826
Damien Miller8c4e18a2002-09-19 12:05:02 +1000827 /*
Damien Millera8e06ce2003-11-21 23:48:55 +1100828 * Send SIGHUP to proxy command if used. We don't wait() in
Damien Miller8c4e18a2002-09-19 12:05:02 +1000829 * case it hangs and instead rely on init to reap the child
830 */
831 if (proxy_command_pid > 1)
832 kill(proxy_command_pid, SIGHUP);
833
Damien Miller1383bd82000-04-06 12:32:37 +1000834 return exit_status;
835}
836
Darren Tucker9f407c42008-06-13 04:50:27 +1000837/* Callback for remote forward global requests */
838static void
839ssh_confirm_remote_forward(int type, u_int32_t seq, void *ctxt)
840{
841 Forward *rfwd = (Forward *)ctxt;
842
Damien Miller4bf648f2009-02-14 16:28:21 +1100843 /* XXX verbose() on failure? */
Darren Tucker9f407c42008-06-13 04:50:27 +1000844 debug("remote forward %s for: listen %d, connect %s:%d",
845 type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
846 rfwd->listen_port, rfwd->connect_host, rfwd->connect_port);
Damien Miller4bf648f2009-02-14 16:28:21 +1100847 if (type == SSH2_MSG_REQUEST_SUCCESS && rfwd->listen_port == 0) {
848 logit("Allocated port %u for remote forward to %s:%d",
849 packet_get_int(),
850 rfwd->connect_host, rfwd->connect_port);
851 }
852
Darren Tucker9f407c42008-06-13 04:50:27 +1000853 if (type == SSH2_MSG_REQUEST_FAILURE) {
854 if (options.exit_on_forward_failure)
855 fatal("Error: remote port forwarding failed for "
856 "listen port %d", rfwd->listen_port);
857 else
858 logit("Warning: remote port forwarding failed for "
859 "listen port %d", rfwd->listen_port);
860 }
Darren Tucker9a2a6092008-07-04 12:53:50 +1000861 if (++remote_forward_confirms_received == options.num_remote_forwards) {
Darren Tucker9f407c42008-06-13 04:50:27 +1000862 debug("All remote forwarding requests processed");
Darren Tucker9a2a6092008-07-04 12:53:50 +1000863 if (fork_after_authentication_flag) {
864 fork_after_authentication_flag = 0;
865 if (daemon(1, 1) < 0)
866 fatal("daemon() failed: %.200s",
867 strerror(errno));
868 }
869 }
Darren Tucker9f407c42008-06-13 04:50:27 +1000870}
871
Ben Lindstrombba81212001-06-25 05:01:22 +0000872static void
Damien Miller0bc1bd82000-11-13 22:57:25 +1100873ssh_init_forwarding(void)
874{
Kevin Steves12057502001-02-05 14:54:34 +0000875 int success = 0;
Damien Miller0bc1bd82000-11-13 22:57:25 +1100876 int i;
Kevin Steves12057502001-02-05 14:54:34 +0000877
Damien Miller0bc1bd82000-11-13 22:57:25 +1100878 /* Initiate local TCP/IP port forwardings. */
879 for (i = 0; i < options.num_local_forwards; i++) {
Damien Millerf91ee4c2005-03-01 21:24:33 +1100880 debug("Local connections to %.200s:%d forwarded to remote "
881 "address %.200s:%d",
Darren Tucker47eede72005-03-14 23:08:12 +1100882 (options.local_forwards[i].listen_host == NULL) ?
883 (options.gateway_ports ? "*" : "LOCALHOST") :
Damien Millerf91ee4c2005-03-01 21:24:33 +1100884 options.local_forwards[i].listen_host,
885 options.local_forwards[i].listen_port,
886 options.local_forwards[i].connect_host,
887 options.local_forwards[i].connect_port);
Damien Millerb16461c2002-01-22 23:29:22 +1100888 success += channel_setup_local_fwd_listener(
Damien Millerf91ee4c2005-03-01 21:24:33 +1100889 options.local_forwards[i].listen_host,
890 options.local_forwards[i].listen_port,
891 options.local_forwards[i].connect_host,
892 options.local_forwards[i].connect_port,
Damien Miller0bc1bd82000-11-13 22:57:25 +1100893 options.gateway_ports);
894 }
Darren Tuckere7d4b192006-07-12 22:17:10 +1000895 if (i > 0 && success != i && options.exit_on_forward_failure)
896 fatal("Could not request local forwarding.");
Kevin Steves12057502001-02-05 14:54:34 +0000897 if (i > 0 && success == 0)
898 error("Could not request local forwarding.");
Damien Miller0bc1bd82000-11-13 22:57:25 +1100899
900 /* Initiate remote TCP/IP port forwardings. */
901 for (i = 0; i < options.num_remote_forwards; i++) {
Damien Millerf91ee4c2005-03-01 21:24:33 +1100902 debug("Remote connections from %.200s:%d forwarded to "
903 "local address %.200s:%d",
Damien Miller46d38de2005-07-17 17:02:09 +1000904 (options.remote_forwards[i].listen_host == NULL) ?
Damien Milleraa3bb102005-11-05 15:12:59 +1100905 "LOCALHOST" : options.remote_forwards[i].listen_host,
Damien Millerf91ee4c2005-03-01 21:24:33 +1100906 options.remote_forwards[i].listen_port,
907 options.remote_forwards[i].connect_host,
908 options.remote_forwards[i].connect_port);
Darren Tuckere7d4b192006-07-12 22:17:10 +1000909 if (channel_request_remote_forwarding(
Damien Millerf91ee4c2005-03-01 21:24:33 +1100910 options.remote_forwards[i].listen_host,
911 options.remote_forwards[i].listen_port,
912 options.remote_forwards[i].connect_host,
Darren Tuckere7d4b192006-07-12 22:17:10 +1000913 options.remote_forwards[i].connect_port) < 0) {
914 if (options.exit_on_forward_failure)
915 fatal("Could not request remote forwarding.");
916 else
917 logit("Warning: Could not request remote "
918 "forwarding.");
919 }
Darren Tucker9f407c42008-06-13 04:50:27 +1000920 client_register_global_confirm(ssh_confirm_remote_forward,
921 &options.remote_forwards[i]);
Damien Miller0bc1bd82000-11-13 22:57:25 +1100922 }
Damien Millerb3ce9fe2007-08-08 14:32:41 +1000923
924 /* Initiate tunnel forwarding. */
925 if (options.tun_open != SSH_TUNMODE_NO) {
926 if (client_request_tun_fwd(options.tun_open,
927 options.tun_local, options.tun_remote) == -1) {
928 if (options.exit_on_forward_failure)
929 fatal("Could not request tunnel forwarding.");
930 else
931 error("Could not request tunnel forwarding.");
932 }
933 }
Damien Miller0bc1bd82000-11-13 22:57:25 +1100934}
935
Ben Lindstrombba81212001-06-25 05:01:22 +0000936static void
Damien Miller0bc1bd82000-11-13 22:57:25 +1100937check_agent_present(void)
938{
939 if (options.forward_agent) {
Damien Miller788f2122005-11-05 15:14:59 +1100940 /* Clear agent forwarding if we don't have an agent. */
Damien Miller789e95d2002-09-12 09:52:46 +1000941 if (!ssh_agent_present())
Damien Miller0bc1bd82000-11-13 22:57:25 +1100942 options.forward_agent = 0;
Damien Miller0bc1bd82000-11-13 22:57:25 +1100943 }
944}
945
Ben Lindstrombba81212001-06-25 05:01:22 +0000946static int
Damien Miller1383bd82000-04-06 12:32:37 +1000947ssh_session(void)
948{
949 int type;
Damien Miller1383bd82000-04-06 12:32:37 +1000950 int interactive = 0;
951 int have_tty = 0;
952 struct winsize ws;
Damien Miller1383bd82000-04-06 12:32:37 +1000953 char *cp;
Damien Miller17e7ed02005-06-17 12:54:33 +1000954 const char *display;
Damien Miller1383bd82000-04-06 12:32:37 +1000955
Damien Miller95def091999-11-25 00:26:21 +1100956 /* Enable compression if requested. */
957 if (options.compression) {
Darren Tuckerd6173c02008-06-13 04:52:53 +1000958 debug("Requesting compression at level %d.",
959 options.compression_level);
Damien Miller95def091999-11-25 00:26:21 +1100960
Darren Tuckerd6173c02008-06-13 04:52:53 +1000961 if (options.compression_level < 1 ||
962 options.compression_level > 9)
963 fatal("Compression level must be from 1 (fast) to "
964 "9 (slow, best).");
Damien Miller95def091999-11-25 00:26:21 +1100965
966 /* Send the request. */
967 packet_start(SSH_CMSG_REQUEST_COMPRESSION);
968 packet_put_int(options.compression_level);
969 packet_send();
970 packet_write_wait();
Damien Millerdff50992002-01-22 23:16:32 +1100971 type = packet_read();
Damien Miller95def091999-11-25 00:26:21 +1100972 if (type == SSH_SMSG_SUCCESS)
973 packet_start_compression(options.compression_level);
974 else if (type == SSH_SMSG_FAILURE)
Damien Miller996acd22003-04-09 20:59:48 +1000975 logit("Warning: Remote host refused compression.");
Damien Miller95def091999-11-25 00:26:21 +1100976 else
Darren Tuckerd6173c02008-06-13 04:52:53 +1000977 packet_disconnect("Protocol error waiting for "
978 "compression response.");
Damien Miller95def091999-11-25 00:26:21 +1100979 }
980 /* Allocate a pseudo tty if appropriate. */
981 if (tty_flag) {
982 debug("Requesting pty.");
983
984 /* Start the packet. */
985 packet_start(SSH_CMSG_REQUEST_PTY);
986
987 /* Store TERM in the packet. There is no limit on the
988 length of the string. */
989 cp = getenv("TERM");
990 if (!cp)
991 cp = "";
Ben Lindstrom664408d2001-06-09 01:42:01 +0000992 packet_put_cstring(cp);
Damien Miller95def091999-11-25 00:26:21 +1100993
994 /* Store window size in the packet. */
995 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
996 memset(&ws, 0, sizeof(ws));
Damien Miller71a73672006-03-26 14:04:36 +1100997 packet_put_int((u_int)ws.ws_row);
998 packet_put_int((u_int)ws.ws_col);
999 packet_put_int((u_int)ws.ws_xpixel);
1000 packet_put_int((u_int)ws.ws_ypixel);
Damien Miller95def091999-11-25 00:26:21 +11001001
1002 /* Store tty modes in the packet. */
Ben Lindstromae8e2d32001-04-14 23:13:02 +00001003 tty_make_modes(fileno(stdin), NULL);
Damien Miller95def091999-11-25 00:26:21 +11001004
1005 /* Send the packet, and wait for it to leave. */
1006 packet_send();
1007 packet_write_wait();
1008
1009 /* Read response from the server. */
Damien Millerdff50992002-01-22 23:16:32 +11001010 type = packet_read();
Damien Miller450a7a12000-03-26 13:04:51 +10001011 if (type == SSH_SMSG_SUCCESS) {
Damien Miller95def091999-11-25 00:26:21 +11001012 interactive = 1;
Damien Miller1383bd82000-04-06 12:32:37 +10001013 have_tty = 1;
Damien Miller450a7a12000-03-26 13:04:51 +10001014 } else if (type == SSH_SMSG_FAILURE)
Darren Tuckerd6173c02008-06-13 04:52:53 +10001015 logit("Warning: Remote host failed or refused to "
1016 "allocate a pseudo tty.");
Damien Miller95def091999-11-25 00:26:21 +11001017 else
Darren Tuckerd6173c02008-06-13 04:52:53 +10001018 packet_disconnect("Protocol error waiting for pty "
1019 "request response.");
Damien Miller95def091999-11-25 00:26:21 +11001020 }
1021 /* Request X11 forwarding if enabled and DISPLAY is set. */
Damien Miller17e7ed02005-06-17 12:54:33 +10001022 display = getenv("DISPLAY");
1023 if (options.forward_x11 && display != NULL) {
Ben Lindstrom4a4bd712001-12-06 17:45:19 +00001024 char *proto, *data;
Damien Millerbd483e72000-04-30 10:00:53 +10001025 /* Get reasonable local authentication information. */
Damien Miller17e7ed02005-06-17 12:54:33 +10001026 client_x11_get_proto(display, options.xauth_location,
1027 options.forward_x11_trusted, &proto, &data);
Damien Millerbd483e72000-04-30 10:00:53 +10001028 /* Request forwarding with authentication spoofing. */
Darren Tuckerd6173c02008-06-13 04:52:53 +10001029 debug("Requesting X11 forwarding with authentication "
1030 "spoofing.");
Damien Miller17e7ed02005-06-17 12:54:33 +10001031 x11_request_forwarding_with_spoofing(0, display, proto, data);
Damien Miller95def091999-11-25 00:26:21 +11001032
1033 /* Read response from the server. */
Damien Millerdff50992002-01-22 23:16:32 +11001034 type = packet_read();
Damien Miller95def091999-11-25 00:26:21 +11001035 if (type == SSH_SMSG_SUCCESS) {
Damien Miller95def091999-11-25 00:26:21 +11001036 interactive = 1;
Damien Millerbd483e72000-04-30 10:00:53 +10001037 } else if (type == SSH_SMSG_FAILURE) {
Damien Miller996acd22003-04-09 20:59:48 +10001038 logit("Warning: Remote host denied X11 forwarding.");
Damien Millerbd483e72000-04-30 10:00:53 +10001039 } else {
Darren Tuckerd6173c02008-06-13 04:52:53 +10001040 packet_disconnect("Protocol error waiting for X11 "
1041 "forwarding");
Damien Millerbd483e72000-04-30 10:00:53 +10001042 }
Damien Miller95def091999-11-25 00:26:21 +11001043 }
1044 /* Tell the packet module whether this is an interactive session. */
Ben Lindstrombf555ba2001-01-18 02:04:35 +00001045 packet_set_interactive(interactive);
Damien Miller95def091999-11-25 00:26:21 +11001046
1047 /* Request authentication agent forwarding if appropriate. */
Damien Miller0bc1bd82000-11-13 22:57:25 +11001048 check_agent_present();
1049
Damien Miller95def091999-11-25 00:26:21 +11001050 if (options.forward_agent) {
1051 debug("Requesting authentication agent forwarding.");
1052 auth_request_forwarding();
1053
1054 /* Read response from the server. */
Damien Millerdff50992002-01-22 23:16:32 +11001055 type = packet_read();
Damien Miller48b03fc2002-01-22 23:11:40 +11001056 packet_check_eom();
Damien Miller95def091999-11-25 00:26:21 +11001057 if (type != SSH_SMSG_SUCCESS)
Damien Miller996acd22003-04-09 20:59:48 +10001058 logit("Warning: Remote host denied authentication agent forwarding.");
Damien Miller95def091999-11-25 00:26:21 +11001059 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001060
Damien Miller0bc1bd82000-11-13 22:57:25 +11001061 /* Initiate port forwardings. */
1062 ssh_init_forwarding();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001063
Darren Tuckerb776c852007-12-02 23:06:35 +11001064 /* Execute a local command */
1065 if (options.local_command != NULL &&
1066 options.permit_local_command)
1067 ssh_local_cmd(options.local_command);
1068
Darren Tucker9a2a6092008-07-04 12:53:50 +10001069 /*
1070 * If requested and we are not interested in replies to remote
1071 * forwarding requests, then let ssh continue in the background.
1072 */
1073 if (fork_after_authentication_flag &&
1074 (!options.exit_on_forward_failure ||
1075 options.num_remote_forwards == 0)) {
1076 fork_after_authentication_flag = 0;
Damien Miller5428f641999-11-25 11:54:57 +11001077 if (daemon(1, 1) < 0)
1078 fatal("daemon() failed: %.200s", strerror(errno));
Darren Tucker9a2a6092008-07-04 12:53:50 +10001079 }
Damien Miller5428f641999-11-25 11:54:57 +11001080
1081 /*
1082 * If a command was specified on the command line, execute the
1083 * command now. Otherwise request the server to start a shell.
1084 */
Damien Miller95def091999-11-25 00:26:21 +11001085 if (buffer_len(&command) > 0) {
1086 int len = buffer_len(&command);
1087 if (len > 900)
1088 len = 900;
Darren Tuckerd6173c02008-06-13 04:52:53 +10001089 debug("Sending command: %.*s", len,
1090 (u_char *)buffer_ptr(&command));
Damien Miller95def091999-11-25 00:26:21 +11001091 packet_start(SSH_CMSG_EXEC_CMD);
1092 packet_put_string(buffer_ptr(&command), buffer_len(&command));
1093 packet_send();
1094 packet_write_wait();
1095 } else {
1096 debug("Requesting shell.");
1097 packet_start(SSH_CMSG_EXEC_SHELL);
1098 packet_send();
1099 packet_write_wait();
1100 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001101
Damien Miller95def091999-11-25 00:26:21 +11001102 /* Enter the interactive session. */
Ben Lindstrom2b1f71b2001-06-05 20:32:21 +00001103 return client_loop(have_tty, tty_flag ?
1104 options.escape_char : SSH_ESCAPECHAR_NONE, 0);
Damien Miller1383bd82000-04-06 12:32:37 +10001105}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001106
Ben Lindstromf558cf62001-09-20 23:13:49 +00001107/* request pty/x11/agent/tcpfwd/shell for channel */
Ben Lindstrombba81212001-06-25 05:01:22 +00001108static void
Ben Lindstromf558cf62001-09-20 23:13:49 +00001109ssh_session2_setup(int id, void *arg)
Damien Miller1383bd82000-04-06 12:32:37 +10001110{
Damien Miller3756dce2004-06-18 01:17:29 +10001111 extern char **environ;
Damien Miller17e7ed02005-06-17 12:54:33 +10001112 const char *display;
Damien Miller0e220db2004-06-15 10:34:08 +10001113 int interactive = tty_flag;
Damien Miller17e7ed02005-06-17 12:54:33 +10001114
Damien Miller46d38de2005-07-17 17:02:09 +10001115 display = getenv("DISPLAY");
Damien Miller17e7ed02005-06-17 12:54:33 +10001116 if (options.forward_x11 && display != NULL) {
Ben Lindstrom4a4bd712001-12-06 17:45:19 +00001117 char *proto, *data;
Damien Millerbd483e72000-04-30 10:00:53 +10001118 /* Get reasonable local authentication information. */
Damien Miller17e7ed02005-06-17 12:54:33 +10001119 client_x11_get_proto(display, options.xauth_location,
1120 options.forward_x11_trusted, &proto, &data);
Damien Millerbd483e72000-04-30 10:00:53 +10001121 /* Request forwarding with authentication spoofing. */
Darren Tuckerd6173c02008-06-13 04:52:53 +10001122 debug("Requesting X11 forwarding with authentication "
1123 "spoofing.");
Damien Miller17e7ed02005-06-17 12:54:33 +10001124 x11_request_forwarding_with_spoofing(id, display, proto, data);
Ben Lindstrombf555ba2001-01-18 02:04:35 +00001125 interactive = 1;
Damien Millerbd483e72000-04-30 10:00:53 +10001126 /* XXX wait for reply */
1127 }
1128
Damien Miller0bc1bd82000-11-13 22:57:25 +11001129 check_agent_present();
1130 if (options.forward_agent) {
1131 debug("Requesting authentication agent forwarding.");
1132 channel_request_start(id, "auth-agent-req@openssh.com", 0);
1133 packet_send();
1134 }
1135
Damien Miller0e220db2004-06-15 10:34:08 +10001136 client_session2_setup(id, tty_flag, subsystem_flag, getenv("TERM"),
Damien Miller5771ed72008-05-19 15:35:33 +10001137 NULL, fileno(stdin), &command, environ);
Ben Lindstrom1e7d3062001-02-09 02:36:43 +00001138
Ben Lindstrombf555ba2001-01-18 02:04:35 +00001139 packet_set_interactive(interactive);
Damien Miller1383bd82000-04-06 12:32:37 +10001140}
1141
Ben Lindstromf558cf62001-09-20 23:13:49 +00001142/* open new channel for a session */
Ben Lindstrombba81212001-06-25 05:01:22 +00001143static int
Ben Lindstromf558cf62001-09-20 23:13:49 +00001144ssh_session2_open(void)
Damien Miller1383bd82000-04-06 12:32:37 +10001145{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001146 Channel *c;
1147 int window, packetmax, in, out, err;
Damien Millerad833b32000-08-23 10:46:23 +10001148
Damien Millercaf6dd62000-08-29 11:33:50 +11001149 if (stdin_null_flag) {
Ben Lindstrom31ca54a2001-02-09 02:11:24 +00001150 in = open(_PATH_DEVNULL, O_RDONLY);
Damien Millercaf6dd62000-08-29 11:33:50 +11001151 } else {
1152 in = dup(STDIN_FILENO);
1153 }
1154 out = dup(STDOUT_FILENO);
1155 err = dup(STDERR_FILENO);
1156
1157 if (in < 0 || out < 0 || err < 0)
1158 fatal("dup() in/out/err failed");
1159
Damien Miller69b69aa2000-10-28 14:19:58 +11001160 /* enable nonblocking unless tty */
1161 if (!isatty(in))
1162 set_nonblock(in);
1163 if (!isatty(out))
1164 set_nonblock(out);
1165 if (!isatty(err))
1166 set_nonblock(err);
1167
Damien Millere4340be2000-09-16 13:29:08 +11001168 window = CHAN_SES_WINDOW_DEFAULT;
1169 packetmax = CHAN_SES_PACKET_DEFAULT;
Damien Miller19a59452002-02-19 15:20:57 +11001170 if (tty_flag) {
1171 window >>= 1;
1172 packetmax >>= 1;
Damien Miller1383bd82000-04-06 12:32:37 +10001173 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001174 c = channel_new(
Damien Miller1383bd82000-04-06 12:32:37 +10001175 "session", SSH_CHANNEL_OPENING, in, out, err,
Damien Millere4340be2000-09-16 13:29:08 +11001176 window, packetmax, CHAN_EXTENDED_WRITE,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10001177 "client-session", /*nonblock*/0);
Damien Miller1383bd82000-04-06 12:32:37 +10001178
Ben Lindstromf558cf62001-09-20 23:13:49 +00001179 debug3("ssh_session2_open: channel_new: %d", c->self);
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001180
Ben Lindstrom5ec26452001-06-09 00:18:51 +00001181 channel_send_open(c->self);
Ben Lindstromf558cf62001-09-20 23:13:49 +00001182 if (!no_shell_flag)
Damien Millerb84886b2008-05-19 15:05:07 +10001183 channel_register_open_confirm(c->self,
1184 ssh_session2_setup, NULL);
Damien Miller1383bd82000-04-06 12:32:37 +10001185
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001186 return c->self;
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001187}
1188
Ben Lindstrombba81212001-06-25 05:01:22 +00001189static int
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001190ssh_session2(void)
1191{
Ben Lindstromf558cf62001-09-20 23:13:49 +00001192 int id = -1;
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001193
1194 /* XXX should be pre-session */
1195 ssh_init_forwarding();
1196
Ben Lindstromf558cf62001-09-20 23:13:49 +00001197 if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN))
1198 id = ssh_session2_open();
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001199
Darren Tucker8901fa92008-06-11 09:34:01 +10001200 /* If we don't expect to open a new session, then disallow it */
Damien Miller456e6f02008-11-03 19:20:10 +11001201 if (options.control_master == SSHCTL_MASTER_NO &&
1202 (datafellows & SSH_NEW_OPENSSH)) {
Darren Tucker8901fa92008-06-11 09:34:01 +10001203 debug("Requesting no-more-sessions@openssh.com");
1204 packet_start(SSH2_MSG_GLOBAL_REQUEST);
1205 packet_put_cstring("no-more-sessions@openssh.com");
1206 packet_put_char(0);
1207 packet_send();
1208 }
1209
Damien Millerd27b9472005-12-13 19:29:02 +11001210 /* Execute a local command */
1211 if (options.local_command != NULL &&
1212 options.permit_local_command)
1213 ssh_local_cmd(options.local_command);
1214
Damien Millerb3ce9fe2007-08-08 14:32:41 +10001215 /* Start listening for multiplex clients */
Damien Millerb1cbfa22008-05-19 16:00:08 +10001216 muxserver_listen();
Damien Millerb3ce9fe2007-08-08 14:32:41 +10001217
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001218 /* If requested, let ssh continue in the background. */
Darren Tucker9a2a6092008-07-04 12:53:50 +10001219 if (fork_after_authentication_flag) {
1220 fork_after_authentication_flag = 0;
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001221 if (daemon(1, 1) < 0)
1222 fatal("daemon() failed: %.200s", strerror(errno));
Darren Tucker9a2a6092008-07-04 12:53:50 +10001223 }
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001224
Ben Lindstrom2b1f71b2001-06-05 20:32:21 +00001225 return client_loop(tty_flag, tty_flag ?
1226 options.escape_char : SSH_ESCAPECHAR_NONE, id);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001227}
Damien Miller0bc1bd82000-11-13 22:57:25 +11001228
Ben Lindstrombba81212001-06-25 05:01:22 +00001229static void
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001230load_public_identity_files(void)
1231{
Damien Miller6b1d53c2006-03-31 23:13:21 +11001232 char *filename, *cp, thishost[NI_MAXHOST];
Darren Tuckerb4fbbc62007-12-02 23:16:32 +11001233 char *pwdir = NULL, *pwname = NULL;
Ben Lindstrom711b04a2001-08-06 21:12:42 +00001234 int i = 0;
Ben Lindstrom0936a5b2002-03-26 03:17:42 +00001235 Key *public;
Damien Miller6b1d53c2006-03-31 23:13:21 +11001236 struct passwd *pw;
Ben Lindstrom711b04a2001-08-06 21:12:42 +00001237#ifdef SMARTCARD
Ben Lindstrom0936a5b2002-03-26 03:17:42 +00001238 Key **keys;
1239
Ben Lindstromf7db3bb2001-08-06 21:35:51 +00001240 if (options.smartcard_device != NULL &&
Ben Lindstrom0936a5b2002-03-26 03:17:42 +00001241 options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
Damien Miller4dec5d72006-08-05 11:38:40 +10001242 (keys = sc_get_keys(options.smartcard_device, NULL)) != NULL) {
Ben Lindstrom0936a5b2002-03-26 03:17:42 +00001243 int count = 0;
1244 for (i = 0; keys[i] != NULL; i++) {
1245 count++;
Darren Tuckerd6173c02008-06-13 04:52:53 +10001246 memmove(&options.identity_files[1],
1247 &options.identity_files[0],
Ben Lindstrom0936a5b2002-03-26 03:17:42 +00001248 sizeof(char *) * (SSH_MAX_IDENTITY_FILES - 1));
Darren Tuckerd6173c02008-06-13 04:52:53 +10001249 memmove(&options.identity_keys[1],
1250 &options.identity_keys[0],
Ben Lindstrom0936a5b2002-03-26 03:17:42 +00001251 sizeof(Key *) * (SSH_MAX_IDENTITY_FILES - 1));
1252 options.num_identity_files++;
1253 options.identity_keys[0] = keys[i];
Damien Miller56a0bb02003-06-18 20:28:40 +10001254 options.identity_files[0] = sc_get_key_label(keys[i]);
Ben Lindstrom0936a5b2002-03-26 03:17:42 +00001255 }
Ben Lindstrom4f054602002-03-26 03:23:00 +00001256 if (options.num_identity_files > SSH_MAX_IDENTITY_FILES)
1257 options.num_identity_files = SSH_MAX_IDENTITY_FILES;
Ben Lindstrom0936a5b2002-03-26 03:17:42 +00001258 i = count;
1259 xfree(keys);
Ben Lindstrom711b04a2001-08-06 21:12:42 +00001260 }
Ben Lindstromffce1472001-08-06 21:57:31 +00001261#endif /* SMARTCARD */
Damien Miller6b1d53c2006-03-31 23:13:21 +11001262 if ((pw = getpwuid(original_real_uid)) == NULL)
1263 fatal("load_public_identity_files: getpwuid failed");
Darren Tuckere143f062007-12-02 23:21:16 +11001264 pwname = xstrdup(pw->pw_name);
1265 pwdir = xstrdup(pw->pw_dir);
Damien Miller6b1d53c2006-03-31 23:13:21 +11001266 if (gethostname(thishost, sizeof(thishost)) == -1)
1267 fatal("load_public_identity_files: gethostname: %s",
1268 strerror(errno));
Ben Lindstrom711b04a2001-08-06 21:12:42 +00001269 for (; i < options.num_identity_files; i++) {
Damien Miller6b1d53c2006-03-31 23:13:21 +11001270 cp = tilde_expand_filename(options.identity_files[i],
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001271 original_real_uid);
Darren Tuckerb4fbbc62007-12-02 23:16:32 +11001272 filename = percent_expand(cp, "d", pwdir,
1273 "u", pwname, "l", thishost, "h", host,
Damien Miller6b1d53c2006-03-31 23:13:21 +11001274 "r", options.user, (char *)NULL);
1275 xfree(cp);
Ben Lindstromd0fca422001-03-26 13:44:06 +00001276 public = key_load_public(filename, NULL);
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001277 debug("identity file %s type %d", filename,
1278 public ? public->type : -1);
1279 xfree(options.identity_files[i]);
1280 options.identity_files[i] = filename;
1281 options.identity_keys[i] = public;
1282 }
Darren Tuckerb4fbbc62007-12-02 23:16:32 +11001283 bzero(pwname, strlen(pwname));
Darren Tuckere143f062007-12-02 23:21:16 +11001284 xfree(pwname);
Darren Tuckerb4fbbc62007-12-02 23:16:32 +11001285 bzero(pwdir, strlen(pwdir));
Darren Tuckere143f062007-12-02 23:21:16 +11001286 xfree(pwdir);
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001287}