blob: 47297edbb3f021db400199bfcbcba42418009bbe [file] [log] [blame]
Damien Miller952dce62006-10-24 03:01:16 +10001/* $OpenBSD: ssh.c,v 1.294 2006/10/06 02:29:19 djm Exp $ */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002/*
Damien Miller95def091999-11-25 00:26:21 +11003 * Author: Tatu Ylonen <ylo@cs.hut.fi>
4 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5 * All rights reserved
Damien Miller95def091999-11-25 00:26:21 +11006 * Ssh client program. This program can be used to log into a remote machine.
7 * The software supports strong authentication, encryption, and forwarding
8 * of X11, TCP/IP, and authentication connections.
9 *
Damien Millere4340be2000-09-16 13:29:08 +110010 * As far as I am concerned, the code I have written for this software
11 * can be used freely for any purpose. Any derived versions of this
12 * software must be clearly marked as such, and if the derived work is
13 * incompatible with the protocol description in the RFC file, it must be
14 * called by a name other than "ssh" or "Secure Shell".
15 *
16 * Copyright (c) 1999 Niels Provos. All rights reserved.
Darren Tucker0a118da2003-10-15 15:54:32 +100017 * Copyright (c) 2000, 2001, 2002, 2003 Markus Friedl. All rights reserved.
Damien Millere4340be2000-09-16 13:29:08 +110018 *
19 * Modified to work with SSL by Niels Provos <provos@citi.umich.edu>
20 * in Canada (German citizen).
21 *
22 * Redistribution and use in source and binary forms, with or without
23 * modification, are permitted provided that the following conditions
24 * are met:
25 * 1. Redistributions of source code must retain the above copyright
26 * notice, this list of conditions and the following disclaimer.
27 * 2. Redistributions in binary form must reproduce the above copyright
28 * notice, this list of conditions and the following disclaimer in the
29 * documentation and/or other materials provided with the distribution.
30 *
31 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
32 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
33 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
34 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
35 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
36 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
37 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
38 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
39 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
40 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Damien Miller95def091999-11-25 00:26:21 +110041 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100042
43#include "includes.h"
Damien Millercd4223c2006-03-15 11:22:47 +110044
Damien Millerf17883e2006-03-15 11:45:54 +110045#include <sys/types.h>
46#ifdef HAVE_SYS_STAT_H
47# include <sys/stat.h>
48#endif
Damien Millercd4223c2006-03-15 11:22:47 +110049#include <sys/resource.h>
Damien Miller17e91c02006-03-15 11:28:34 +110050#include <sys/ioctl.h>
Damien Millere3b60b52006-07-10 21:08:03 +100051#include <sys/socket.h>
Damien Miller574c41f2006-03-15 11:40:10 +110052#include <sys/un.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>
Damien Millerd4a8b7e1999-10-27 13:42:43 +100075
Damien Millerd7834352006-08-05 12:39:39 +100076#include "xmalloc.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100077#include "ssh.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000078#include "ssh1.h"
Damien Miller1383bd82000-04-06 12:32:37 +100079#include "ssh2.h"
80#include "compat.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000081#include "cipher.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000082#include "packet.h"
83#include "buffer.h"
Ben Lindstromc7637672001-06-09 00:36:26 +000084#include "channels.h"
Damien Millereba71ba2000-04-29 23:57:08 +100085#include "key.h"
Damien Miller994cf142000-07-21 10:19:44 +100086#include "authfd.h"
Damien Millereba71ba2000-04-29 23:57:08 +100087#include "authfile.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000088#include "pathnames.h"
Damien Miller0e220db2004-06-15 10:34:08 +100089#include "dispatch.h"
Ben Lindstrombf555ba2001-01-18 02:04:35 +000090#include "clientloop.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000091#include "log.h"
92#include "readconf.h"
93#include "sshconnect.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000094#include "misc.h"
Ben Lindstrom06b33aa2001-02-15 03:01:59 +000095#include "kex.h"
96#include "mac.h"
Darren Tucker06f2bd82004-05-13 16:06:46 +100097#include "sshpty.h"
Darren Tucker46bc0752004-05-02 22:11:30 +100098#include "match.h"
Damien Miller0e220db2004-06-15 10:34:08 +100099#include "msg.h"
100#include "monitor_fdpass.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
Damien Miller95def091999-11-25 00:26:21 +1100110/* Flag indicating whether debug mode is on. This can 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 */
167static int client_global_request_id = 0;
168
Damien Miller8c4e18a2002-09-19 12:05:02 +1000169/* pid of proxycommand child process */
170pid_t proxy_command_pid = 0;
171
Damien Miller0e220db2004-06-15 10:34:08 +1000172/* fd to control socket */
173int control_fd = -1;
174
Darren Tucker7ebfc102004-11-07 20:06:19 +1100175/* Multiplexing control command */
Darren Tucker0814d312005-06-01 23:08:51 +1000176static u_int mux_command = 0;
Darren Tucker7ebfc102004-11-07 20:06:19 +1100177
Damien Miller0e220db2004-06-15 10:34:08 +1000178/* Only used in control client mode */
179volatile sig_atomic_t control_client_terminate = 0;
180u_int control_server_pid = 0;
181
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000182/* Prints a help message to the user. This function never returns. */
183
Ben Lindstrombba81212001-06-25 05:01:22 +0000184static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000185usage(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000186{
Damien Miller50955102004-03-22 09:34:58 +1100187 fprintf(stderr,
Darren Tucker9c6bf322004-12-03 14:10:19 +1100188"usage: ssh [-1246AaCfgkMNnqsTtVvXxY] [-b bind_address] [-c cipher_spec]\n"
Darren Tucker895d6982005-10-03 18:18:05 +1000189" [-D [bind_address:]port] [-e escape_char] [-F configfile]\n"
Damien Miller02faece2005-03-02 12:04:32 +1100190" [-i identity_file] [-L [bind_address:]port:host:hostport]\n"
Damien Millerf91ee4c2005-03-01 21:24:33 +1100191" [-l login_name] [-m mac_spec] [-O ctl_cmd] [-o option] [-p port]\n"
Damien Miller02faece2005-03-02 12:04:32 +1100192" [-R [bind_address:]port:host:hostport] [-S ctl_path]\n"
Damien Miller991dba42006-07-10 20:16:27 +1000193" [-w local_tun[:remote_tun]] [user@]hostname [command]\n"
Damien Miller50955102004-03-22 09:34:58 +1100194 );
Darren Tuckere9a9b712005-12-20 16:15:51 +1100195 exit(255);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000196}
197
Ben Lindstrombba81212001-06-25 05:01:22 +0000198static int ssh_session(void);
199static int ssh_session2(void);
200static void load_public_identity_files(void);
Damien Miller0e220db2004-06-15 10:34:08 +1000201static void control_client(const char *path);
Damien Miller1383bd82000-04-06 12:32:37 +1000202
Damien Miller95def091999-11-25 00:26:21 +1100203/*
204 * Main program for the ssh client.
205 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000206int
207main(int ac, char **av)
208{
Ben Lindstrom24157572002-06-12 16:09:39 +0000209 int i, opt, exit_status;
Damien Miller9836cf82003-12-17 16:30:06 +1100210 char *p, *cp, *line, buf[256];
Damien Miller95def091999-11-25 00:26:21 +1100211 struct stat st;
Ben Lindstrom086cf212001-03-05 05:56:40 +0000212 struct passwd *pw;
Damien Miller1383bd82000-04-06 12:32:37 +1000213 int dummy;
Ben Lindstrom5ccf63a2001-09-24 20:00:10 +0000214 extern int optind, optreset;
Damien Miller4f8e6692001-07-14 13:22:53 +1000215 extern char *optarg;
Damien Miller9651fe62005-06-26 08:55:25 +1000216 struct servent *sp;
Damien Millerf91ee4c2005-03-01 21:24:33 +1100217 Forward fwd;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000218
Darren Tuckerce321d82005-10-03 18:11:24 +1000219 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
220 sanitise_stdfd();
221
Damien Miller59d3d5b2003-08-22 09:34:41 +1000222 __progname = ssh_get_progname(av[0]);
Damien Millerf9b625c2000-07-09 22:42:32 +1000223 init_rng();
224
Damien Miller5428f641999-11-25 11:54:57 +1100225 /*
226 * Save the original real uid. It will be needed later (uid-swapping
227 * may clobber the real uid).
228 */
Damien Miller95def091999-11-25 00:26:21 +1100229 original_real_uid = getuid();
230 original_effective_uid = geteuid();
Damien Millera8e06ce2003-11-21 23:48:55 +1100231
Damien Miller50b9a602002-09-04 16:50:06 +1000232 /*
233 * Use uid-swapping to give up root privileges for the duration of
234 * option processing. We will re-instantiate the rights when we are
235 * ready to create the privileged port, and will permanently drop
236 * them when the port has been created (actually, when the connection
237 * has been made, as we may need to create the port several times).
238 */
239 PRIV_END;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000240
Damien Miller05dd7952000-10-01 00:42:48 +1100241#ifdef HAVE_SETRLIMIT
Damien Miller95def091999-11-25 00:26:21 +1100242 /* If we are installed setuid root be careful to not drop core. */
243 if (original_real_uid != original_effective_uid) {
244 struct rlimit rlim;
245 rlim.rlim_cur = rlim.rlim_max = 0;
246 if (setrlimit(RLIMIT_CORE, &rlim) < 0)
247 fatal("setrlimit failed: %.100s", strerror(errno));
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000248 }
Damien Millerbac2d8a2000-09-05 16:13:06 +1100249#endif
Ben Lindstrom3fcf1a22001-04-08 18:26:59 +0000250 /* Get user data. */
251 pw = getpwuid(original_real_uid);
252 if (!pw) {
Damien Miller996acd22003-04-09 20:59:48 +1000253 logit("You don't exist, go away!");
Darren Tuckere9a9b712005-12-20 16:15:51 +1100254 exit(255);
Ben Lindstrom3fcf1a22001-04-08 18:26:59 +0000255 }
256 /* Take a copy of the returned structure. */
257 pw = pwcopy(pw);
258
Damien Miller5428f641999-11-25 11:54:57 +1100259 /*
Damien Miller5428f641999-11-25 11:54:57 +1100260 * Set our umask to something reasonable, as some files are created
261 * with the default umask. This will make them world-readable but
262 * writable only by the owner, which is ok for all files for which we
263 * don't set the modes explicitly.
264 */
Damien Miller95def091999-11-25 00:26:21 +1100265 umask(022);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000266
Damien Miller95def091999-11-25 00:26:21 +1100267 /* Initialize option structure to indicate that no values have been set. */
268 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 Millerd4a8b7e1999-10-27 13:42:43 +1000272
Damien Miller2ecb6bd2006-03-15 12:03:53 +1100273 again:
Damien Millerf4614452001-07-14 12:18:10 +1000274 while ((opt = getopt(ac, av,
Damien Millerd27b9472005-12-13 19:29:02 +1100275 "1246ab:c:e:fgi:kl:m:no:p:qstvxACD:F:I:L:MNO:PR:S:TVw:XY")) != -1) {
Damien Miller95def091999-11-25 00:26:21 +1100276 switch (opt) {
Ben Lindstrom1e7d3062001-02-09 02:36:43 +0000277 case '1':
278 options.protocol = SSH_PROTO_1;
279 break;
Damien Miller4af51302000-04-16 11:18:38 +1000280 case '2':
281 options.protocol = SSH_PROTO_2;
282 break;
Damien Miller34132e52000-01-14 15:45:46 +1100283 case '4':
Darren Tucker0a4f04b2003-07-03 20:37:47 +1000284 options.address_family = AF_INET;
Damien Miller34132e52000-01-14 15:45:46 +1100285 break;
Damien Miller34132e52000-01-14 15:45:46 +1100286 case '6':
Darren Tucker0a4f04b2003-07-03 20:37:47 +1000287 options.address_family = AF_INET6;
Damien Miller34132e52000-01-14 15:45:46 +1100288 break;
Damien Miller95def091999-11-25 00:26:21 +1100289 case 'n':
290 stdin_null_flag = 1;
291 break;
Damien Miller95def091999-11-25 00:26:21 +1100292 case 'f':
293 fork_after_authentication_flag = 1;
294 stdin_null_flag = 1;
295 break;
Damien Miller95def091999-11-25 00:26:21 +1100296 case 'x':
297 options.forward_x11 = 0;
298 break;
Damien Miller95def091999-11-25 00:26:21 +1100299 case 'X':
300 options.forward_x11 = 1;
301 break;
Darren Tucker0a118da2003-10-15 15:54:32 +1000302 case 'Y':
303 options.forward_x11 = 1;
304 options.forward_x11_trusted = 1;
305 break;
Damien Miller95def091999-11-25 00:26:21 +1100306 case 'g':
307 options.gateway_ports = 1;
308 break;
Darren Tucker7ebfc102004-11-07 20:06:19 +1100309 case 'O':
310 if (strcmp(optarg, "check") == 0)
311 mux_command = SSHMUX_COMMAND_ALIVE_CHECK;
312 else if (strcmp(optarg, "exit") == 0)
313 mux_command = SSHMUX_COMMAND_TERMINATE;
314 else
315 fatal("Invalid multiplex command.");
316 break;
Damien Miller147bba32002-09-04 16:46:06 +1000317 case 'P': /* deprecated */
Damien Miller95def091999-11-25 00:26:21 +1100318 options.use_privileged_port = 0;
319 break;
Damien Miller95def091999-11-25 00:26:21 +1100320 case 'a':
321 options.forward_agent = 0;
322 break;
Damien Millerb1715dc2000-05-30 13:44:51 +1000323 case 'A':
324 options.forward_agent = 1;
325 break;
Damien Miller95def091999-11-25 00:26:21 +1100326 case 'k':
Damien Millere0113cc2003-11-24 13:10:09 +1100327 options.gss_deleg_creds = 0;
Damien Miller95def091999-11-25 00:26:21 +1100328 break;
Damien Miller95def091999-11-25 00:26:21 +1100329 case 'i':
330 if (stat(optarg, &st) < 0) {
Damien Millerf4614452001-07-14 12:18:10 +1000331 fprintf(stderr, "Warning: Identity file %s "
Damien Miller3eb48b62005-03-01 21:15:46 +1100332 "not accessible: %s.\n", optarg,
333 strerror(errno));
Damien Miller95def091999-11-25 00:26:21 +1100334 break;
335 }
Damien Millerf4614452001-07-14 12:18:10 +1000336 if (options.num_identity_files >=
337 SSH_MAX_IDENTITY_FILES)
338 fatal("Too many identity files specified "
339 "(max %d)", SSH_MAX_IDENTITY_FILES);
340 options.identity_files[options.num_identity_files++] =
341 xstrdup(optarg);
Damien Miller95def091999-11-25 00:26:21 +1100342 break;
Ben Lindstromc5b68002001-07-04 04:52:03 +0000343 case 'I':
344#ifdef SMARTCARD
Ben Lindstromf7db3bb2001-08-06 21:35:51 +0000345 options.smartcard_device = xstrdup(optarg);
Ben Lindstrombcc18082001-08-06 21:59:25 +0000346#else
Ben Lindstromc5b68002001-07-04 04:52:03 +0000347 fprintf(stderr, "no support for smartcards.\n");
Ben Lindstrombcc18082001-08-06 21:59:25 +0000348#endif
Ben Lindstromc5b68002001-07-04 04:52:03 +0000349 break;
Damien Miller95def091999-11-25 00:26:21 +1100350 case 't':
Ben Lindstrom4dccfa52000-12-28 16:40:05 +0000351 if (tty_flag)
352 force_tty_flag = 1;
Damien Miller95def091999-11-25 00:26:21 +1100353 tty_flag = 1;
354 break;
Damien Miller95def091999-11-25 00:26:21 +1100355 case 'v':
Darren Tuckere98dfa32003-07-19 19:54:31 +1000356 if (debug_flag == 0) {
Damien Millere4340be2000-09-16 13:29:08 +1100357 debug_flag = 1;
358 options.log_level = SYSLOG_LEVEL_DEBUG1;
Darren Tuckere98dfa32003-07-19 19:54:31 +1000359 } else {
360 if (options.log_level < SYSLOG_LEVEL_DEBUG3)
361 options.log_level++;
Damien Millere4340be2000-09-16 13:29:08 +1100362 break;
Darren Tuckere98dfa32003-07-19 19:54:31 +1000363 }
Darren Tuckere9bf9842004-11-05 20:05:32 +1100364 /* FALLTHROUGH */
Damien Miller95def091999-11-25 00:26:21 +1100365 case 'V':
Damien Miller0c889cd2004-03-22 09:36:00 +1100366 fprintf(stderr, "%s, %s\n",
Damien Miller2aa6d3c2004-09-12 16:53:04 +1000367 SSH_RELEASE, SSLeay_version(SSLEAY_VERSION));
Damien Miller95def091999-11-25 00:26:21 +1100368 if (opt == 'V')
369 exit(0);
Damien Miller95def091999-11-25 00:26:21 +1100370 break;
Damien Millerd27b9472005-12-13 19:29:02 +1100371 case 'w':
Damien Miller7b58e802005-12-13 19:33:19 +1100372 if (options.tun_open == -1)
373 options.tun_open = SSH_TUNMODE_DEFAULT;
Damien Millerd27b9472005-12-13 19:29:02 +1100374 options.tun_local = a2tun(optarg, &options.tun_remote);
Damien Miller7b58e802005-12-13 19:33:19 +1100375 if (options.tun_local == SSH_TUNID_ERR) {
Damien Millerd27b9472005-12-13 19:29:02 +1100376 fprintf(stderr, "Bad tun device '%s'\n", optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100377 exit(255);
Damien Millerd27b9472005-12-13 19:29:02 +1100378 }
379 break;
Damien Miller95def091999-11-25 00:26:21 +1100380 case 'q':
381 options.log_level = SYSLOG_LEVEL_QUIET;
382 break;
Damien Miller95def091999-11-25 00:26:21 +1100383 case 'e':
384 if (optarg[0] == '^' && optarg[2] == 0 &&
Damien Millerf4614452001-07-14 12:18:10 +1000385 (u_char) optarg[1] >= 64 &&
386 (u_char) optarg[1] < 128)
Ben Lindstrom46c16222000-12-22 01:43:59 +0000387 options.escape_char = (u_char) optarg[1] & 31;
Damien Miller95def091999-11-25 00:26:21 +1100388 else if (strlen(optarg) == 1)
Ben Lindstrom46c16222000-12-22 01:43:59 +0000389 options.escape_char = (u_char) optarg[0];
Damien Miller95def091999-11-25 00:26:21 +1100390 else if (strcmp(optarg, "none") == 0)
Ben Lindstrom2b1f71b2001-06-05 20:32:21 +0000391 options.escape_char = SSH_ESCAPECHAR_NONE;
Damien Miller95def091999-11-25 00:26:21 +1100392 else {
Damien Millerf4614452001-07-14 12:18:10 +1000393 fprintf(stderr, "Bad escape character '%s'.\n",
394 optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100395 exit(255);
Damien Miller95def091999-11-25 00:26:21 +1100396 }
397 break;
Damien Miller95def091999-11-25 00:26:21 +1100398 case 'c':
Damien Millereba71ba2000-04-29 23:57:08 +1000399 if (ciphers_valid(optarg)) {
400 /* SSH2 only */
401 options.ciphers = xstrdup(optarg);
Darren Tucker5cb30ad2004-08-12 22:40:24 +1000402 options.cipher = SSH_CIPHER_INVALID;
Damien Millereba71ba2000-04-29 23:57:08 +1000403 } else {
404 /* SSH1 only */
Damien Millere39cacc2000-11-29 12:18:44 +1100405 options.cipher = cipher_number(optarg);
406 if (options.cipher == -1) {
Damien Millerf4614452001-07-14 12:18:10 +1000407 fprintf(stderr,
408 "Unknown cipher type '%s'\n",
409 optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100410 exit(255);
Damien Millereba71ba2000-04-29 23:57:08 +1000411 }
Damien Millerf4614452001-07-14 12:18:10 +1000412 if (options.cipher == SSH_CIPHER_3DES)
Damien Millere39cacc2000-11-29 12:18:44 +1100413 options.ciphers = "3des-cbc";
Damien Millerf4614452001-07-14 12:18:10 +1000414 else if (options.cipher == SSH_CIPHER_BLOWFISH)
Damien Millere39cacc2000-11-29 12:18:44 +1100415 options.ciphers = "blowfish-cbc";
Damien Millerf4614452001-07-14 12:18:10 +1000416 else
Damien Millere39cacc2000-11-29 12:18:44 +1100417 options.ciphers = (char *)-1;
Damien Miller95def091999-11-25 00:26:21 +1100418 }
419 break;
Ben Lindstrom06b33aa2001-02-15 03:01:59 +0000420 case 'm':
421 if (mac_valid(optarg))
422 options.macs = xstrdup(optarg);
423 else {
Damien Millerf4614452001-07-14 12:18:10 +1000424 fprintf(stderr, "Unknown mac type '%s'\n",
425 optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100426 exit(255);
Ben Lindstrom06b33aa2001-02-15 03:01:59 +0000427 }
428 break;
Damien Miller0e220db2004-06-15 10:34:08 +1000429 case 'M':
Damien Millerd14b1e72005-06-16 13:19:41 +1000430 if (options.control_master == SSHCTL_MASTER_YES)
431 options.control_master = SSHCTL_MASTER_ASK;
432 else
433 options.control_master = SSHCTL_MASTER_YES;
Damien Miller0e220db2004-06-15 10:34:08 +1000434 break;
Damien Miller95def091999-11-25 00:26:21 +1100435 case 'p':
Ben Lindstrom19066a12001-04-12 23:39:26 +0000436 options.port = a2port(optarg);
437 if (options.port == 0) {
Ben Lindstrom146edb92001-04-11 23:06:28 +0000438 fprintf(stderr, "Bad port '%s'\n", optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100439 exit(255);
Ben Lindstrom146edb92001-04-11 23:06:28 +0000440 }
Damien Miller95def091999-11-25 00:26:21 +1100441 break;
Damien Miller95def091999-11-25 00:26:21 +1100442 case 'l':
443 options.user = optarg;
444 break;
Ben Lindstrom1a174712001-09-12 17:56:15 +0000445
Damien Miller95def091999-11-25 00:26:21 +1100446 case 'L':
Damien Millerf91ee4c2005-03-01 21:24:33 +1100447 if (parse_forward(&fwd, optarg))
448 add_local_forward(&options, &fwd);
449 else {
Damien Millerf4614452001-07-14 12:18:10 +1000450 fprintf(stderr,
Damien Millerf91ee4c2005-03-01 21:24:33 +1100451 "Bad local forwarding specification '%s'\n",
Damien Millerf4614452001-07-14 12:18:10 +1000452 optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100453 exit(255);
Ben Lindstrom1a174712001-09-12 17:56:15 +0000454 }
Damien Millerf91ee4c2005-03-01 21:24:33 +1100455 break;
456
457 case 'R':
458 if (parse_forward(&fwd, optarg)) {
459 add_remote_forward(&options, &fwd);
460 } else {
461 fprintf(stderr,
462 "Bad remote forwarding specification "
463 "'%s'\n", optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100464 exit(255);
Damien Millerf91ee4c2005-03-01 21:24:33 +1100465 }
Damien Miller95def091999-11-25 00:26:21 +1100466 break;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000467
468 case 'D':
Damien Millerf91ee4c2005-03-01 21:24:33 +1100469 cp = p = xstrdup(optarg);
470 memset(&fwd, '\0', sizeof(fwd));
471 fwd.connect_host = "socks";
472 if ((fwd.listen_host = hpdelim(&cp)) == NULL) {
473 fprintf(stderr, "Bad dynamic forwarding "
474 "specification '%.100s'\n", optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100475 exit(255);
Damien Millerf91ee4c2005-03-01 21:24:33 +1100476 }
477 if (cp != NULL) {
478 fwd.listen_port = a2port(cp);
479 fwd.listen_host = cleanhostname(fwd.listen_host);
480 } else {
481 fwd.listen_port = a2port(fwd.listen_host);
Damien Millerbe1045d2005-08-12 22:10:56 +1000482 fwd.listen_host = NULL;
Damien Millerf91ee4c2005-03-01 21:24:33 +1100483 }
484
485 if (fwd.listen_port == 0) {
Damien Millerf4614452001-07-14 12:18:10 +1000486 fprintf(stderr, "Bad dynamic port '%s'\n",
487 optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100488 exit(255);
Ben Lindstrom146edb92001-04-11 23:06:28 +0000489 }
Damien Millerf91ee4c2005-03-01 21:24:33 +1100490 add_local_forward(&options, &fwd);
491 xfree(p);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000492 break;
493
Damien Miller95def091999-11-25 00:26:21 +1100494 case 'C':
495 options.compression = 1;
496 break;
Damien Miller1383bd82000-04-06 12:32:37 +1000497 case 'N':
498 no_shell_flag = 1;
499 no_tty_flag = 1;
500 break;
Damien Miller1383bd82000-04-06 12:32:37 +1000501 case 'T':
502 no_tty_flag = 1;
503 break;
Damien Miller95def091999-11-25 00:26:21 +1100504 case 'o':
505 dummy = 1;
Damien Miller9836cf82003-12-17 16:30:06 +1100506 line = xstrdup(optarg);
Damien Millerf4614452001-07-14 12:18:10 +1000507 if (process_config_line(&options, host ? host : "",
Damien Miller9836cf82003-12-17 16:30:06 +1100508 line, "command-line", 0, &dummy) != 0)
Darren Tuckere9a9b712005-12-20 16:15:51 +1100509 exit(255);
Damien Miller9836cf82003-12-17 16:30:06 +1100510 xfree(line);
Damien Miller95def091999-11-25 00:26:21 +1100511 break;
Damien Miller832562e2001-01-30 09:30:01 +1100512 case 's':
513 subsystem_flag = 1;
514 break;
Damien Miller0e220db2004-06-15 10:34:08 +1000515 case 'S':
516 if (options.control_path != NULL)
517 free(options.control_path);
518 options.control_path = xstrdup(optarg);
Damien Miller0e220db2004-06-15 10:34:08 +1000519 break;
Ben Lindstrome0f88042001-04-30 13:06:24 +0000520 case 'b':
521 options.bind_address = optarg;
522 break;
Ben Lindstrom14f31ab2001-09-12 17:48:04 +0000523 case 'F':
524 config = optarg;
525 break;
Damien Miller95def091999-11-25 00:26:21 +1100526 default:
527 usage();
528 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000529 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000530
Damien Millerf4614452001-07-14 12:18:10 +1000531 ac -= optind;
532 av += optind;
533
534 if (ac > 0 && !host && **av != '-') {
Ben Lindstromc276c122002-12-23 02:14:51 +0000535 if (strrchr(*av, '@')) {
Damien Millerf4614452001-07-14 12:18:10 +1000536 p = xstrdup(*av);
Ben Lindstromc276c122002-12-23 02:14:51 +0000537 cp = strrchr(p, '@');
Damien Millerf4614452001-07-14 12:18:10 +1000538 if (cp == NULL || cp == p)
539 usage();
540 options.user = p;
541 *cp = '\0';
542 host = ++cp;
543 } else
544 host = *av;
Ben Lindstromb9fa6912002-12-23 02:24:54 +0000545 if (ac > 1) {
546 optind = optreset = 1;
Damien Millerf4614452001-07-14 12:18:10 +1000547 goto again;
548 }
Ben Lindstromb9fa6912002-12-23 02:24:54 +0000549 ac--, av++;
Damien Millerf4614452001-07-14 12:18:10 +1000550 }
551
Damien Miller95def091999-11-25 00:26:21 +1100552 /* Check that we got a host name. */
553 if (!host)
554 usage();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000555
Damien Millercb5e44a2000-09-29 12:12:36 +1100556 SSLeay_add_all_algorithms();
Damien Miller0bc1bd82000-11-13 22:57:25 +1100557 ERR_load_crypto_strings();
Damien Millercb5e44a2000-09-29 12:12:36 +1100558
Damien Miller95def091999-11-25 00:26:21 +1100559 /* Initialize the command to execute on remote host. */
560 buffer_init(&command);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000561
Damien Miller5428f641999-11-25 11:54:57 +1100562 /*
563 * Save the command to execute on the remote host in a buffer. There
564 * is no limit on the length of the command, except by the maximum
565 * packet size. Also sets the tty flag if there is no command.
566 */
Damien Millerf4614452001-07-14 12:18:10 +1000567 if (!ac) {
Damien Miller95def091999-11-25 00:26:21 +1100568 /* No command specified - execute shell on a tty. */
569 tty_flag = 1;
Damien Miller832562e2001-01-30 09:30:01 +1100570 if (subsystem_flag) {
Damien Millerf4614452001-07-14 12:18:10 +1000571 fprintf(stderr,
572 "You must specify a subsystem to invoke.\n");
Damien Miller832562e2001-01-30 09:30:01 +1100573 usage();
574 }
Damien Miller95def091999-11-25 00:26:21 +1100575 } else {
Damien Millerf4614452001-07-14 12:18:10 +1000576 /* A command has been specified. Store it into the buffer. */
577 for (i = 0; i < ac; i++) {
578 if (i)
Damien Miller95def091999-11-25 00:26:21 +1100579 buffer_append(&command, " ", 1);
580 buffer_append(&command, av[i], strlen(av[i]));
581 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000582 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000583
Damien Miller95def091999-11-25 00:26:21 +1100584 /* Cannot fork to background if no command. */
Damien Millercaf6dd62000-08-29 11:33:50 +1100585 if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag)
Damien Miller95def091999-11-25 00:26:21 +1100586 fatal("Cannot fork into background without a command to execute.");
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000587
Damien Miller95def091999-11-25 00:26:21 +1100588 /* Allocate a tty by default if no command specified. */
589 if (buffer_len(&command) == 0)
590 tty_flag = 1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000591
Ben Lindstroma962c2f2002-07-04 00:14:17 +0000592 /* Force no tty */
Ben Lindstromc72745a2000-12-02 19:03:54 +0000593 if (no_tty_flag)
594 tty_flag = 0;
Damien Miller95def091999-11-25 00:26:21 +1100595 /* Do not allocate a tty if stdin is not a tty. */
Damien Millerddee5752005-05-26 12:05:05 +1000596 if ((!isatty(fileno(stdin)) || stdin_null_flag) && !force_tty_flag) {
Damien Miller95def091999-11-25 00:26:21 +1100597 if (tty_flag)
Damien Miller996acd22003-04-09 20:59:48 +1000598 logit("Pseudo-terminal will not be allocated because stdin is not a terminal.");
Damien Miller95def091999-11-25 00:26:21 +1100599 tty_flag = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000600 }
Damien Miller1383bd82000-04-06 12:32:37 +1000601
Ben Lindstrom8a432f52001-03-05 07:24:46 +0000602 /*
603 * Initialize "log" output. Since we are the client all output
604 * actually goes to stderr.
605 */
Ben Lindstrom2b646522001-04-12 16:16:57 +0000606 log_init(av[0], options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level,
607 SYSLOG_FACILITY_USER, 1);
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));
Ben Lindstrom14f31ab2001-09-12 17:48:04 +0000617 } else {
618 snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir,
619 _PATH_SSH_USER_CONFFILE);
Damien Miller57a44762004-04-20 20:11:57 +1000620 (void)read_config_file(buf, host, &options, 1);
Ben Lindstrom83f07d12001-10-03 17:22:29 +0000621
622 /* Read systemwide configuration file after use config. */
Darren Tuckerfc959702004-07-17 16:12:08 +1000623 (void)read_config_file(_PATH_HOST_CONFIG_FILE, host,
Damien Miller57a44762004-04-20 20:11:57 +1000624 &options, 0);
Ben Lindstrom14f31ab2001-09-12 17:48:04 +0000625 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000626
Damien Miller95def091999-11-25 00:26:21 +1100627 /* Fill configuration defaults. */
628 fill_default_options(&options);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000629
Darren Tucker0a4f04b2003-07-03 20:37:47 +1000630 channel_set_af(options.address_family);
631
Damien Miller95def091999-11-25 00:26:21 +1100632 /* reinit */
Ben Lindstrom8a432f52001-03-05 07:24:46 +0000633 log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 1);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000634
Damien Miller60bc5172001-03-19 09:38:15 +1100635 seed_rng();
636
Damien Miller95def091999-11-25 00:26:21 +1100637 if (options.user == NULL)
638 options.user = xstrdup(pw->pw_name);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000639
Damien Miller95def091999-11-25 00:26:21 +1100640 if (options.hostname != NULL)
641 host = options.hostname;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000642
Darren Tucker3f521e22003-07-03 16:20:42 +1000643 /* force lowercase for hostkey matching */
644 if (options.host_key_alias != NULL) {
645 for (p = options.host_key_alias; *p; p++)
646 if (isupper(*p))
Damien Miller1d2b6702006-03-26 14:09:54 +1100647 *p = (char)tolower(*p);
Darren Tucker3f521e22003-07-03 16:20:42 +1000648 }
649
Damien Miller7c71cc72005-06-26 08:56:31 +1000650 /* Get default port if port has not been set. */
651 if (options.port == 0) {
652 sp = getservbyname(SSH_SERVICE_NAME, "tcp");
653 options.port = sp ? ntohs(sp->s_port) : SSH_DEFAULT_PORT;
654 }
655
Damien Miller9f1e33a2003-02-24 11:57:32 +1100656 if (options.proxy_command != NULL &&
657 strcmp(options.proxy_command, "none") == 0)
658 options.proxy_command = NULL;
Damien Miller8f74c8f2005-06-26 08:56:03 +1000659 if (options.control_path != NULL &&
660 strcmp(options.control_path, "none") == 0)
661 options.control_path = NULL;
Damien Miller9f1e33a2003-02-24 11:57:32 +1100662
Damien Miller0e220db2004-06-15 10:34:08 +1000663 if (options.control_path != NULL) {
Damien Miller6b1d53c2006-03-31 23:13:21 +1100664 char thishost[NI_MAXHOST];
Damien Miller3ec54c72006-03-15 11:30:13 +1100665
Damien Miller6b1d53c2006-03-31 23:13:21 +1100666 if (gethostname(thishost, sizeof(thishost)) == -1)
Damien Miller3ec54c72006-03-15 11:30:13 +1100667 fatal("gethostname: %s", strerror(errno));
Damien Miller6476cad2005-06-16 13:18:34 +1000668 snprintf(buf, sizeof(buf), "%d", options.port);
669 cp = tilde_expand_filename(options.control_path,
670 original_real_uid);
671 options.control_path = percent_expand(cp, "p", buf, "h", host,
Damien Miller6b1d53c2006-03-31 23:13:21 +1100672 "r", options.user, "l", thishost, (char *)NULL);
Damien Miller6476cad2005-06-16 13:18:34 +1000673 xfree(cp);
Damien Miller0e220db2004-06-15 10:34:08 +1000674 }
Darren Tucker0814d312005-06-01 23:08:51 +1000675 if (mux_command != 0 && options.control_path == NULL)
676 fatal("No ControlPath specified for \"-O\" command");
Damien Millerd14b1e72005-06-16 13:19:41 +1000677 if (options.control_path != NULL)
Damien Millerdadfd4d2005-05-26 12:07:13 +1000678 control_client(options.control_path);
Damien Miller0e220db2004-06-15 10:34:08 +1000679
Kevin Stevesfcec7f82000-12-15 19:55:48 +0000680 /* Open a connection to the remote host. */
Darren Tucker0a4f04b2003-07-03 20:37:47 +1000681 if (ssh_connect(host, &hostaddr, options.port,
682 options.address_family, options.connection_attempts,
Ben Lindstrom1aa64272002-06-11 20:28:05 +0000683#ifdef HAVE_CYGWIN
684 options.use_privileged_port,
685#else
Ben Lindstromf9c48842002-06-11 16:37:51 +0000686 original_effective_uid == 0 && options.use_privileged_port,
Ben Lindstrom1aa64272002-06-11 20:28:05 +0000687#endif
Ben Lindstromda394ca2002-06-12 16:11:12 +0000688 options.proxy_command) != 0)
Darren Tuckere9a9b712005-12-20 16:15:51 +1100689 exit(255);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000690
Damien Miller5428f641999-11-25 11:54:57 +1100691 /*
692 * If we successfully made the connection, load the host private key
693 * in case we will need it later for combined rsa-rhosts
694 * authentication. This must be done before releasing extra
695 * privileges, because the file is only readable by root.
Ben Lindstrom9e5bb572002-06-06 19:58:27 +0000696 * If we cannot access the private keys, load the public keys
697 * instead and try to execute the ssh-keysign helper instead.
Damien Miller5428f641999-11-25 11:54:57 +1100698 */
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000699 sensitive_data.nkeys = 0;
700 sensitive_data.keys = NULL;
Ben Lindstrom1bad2562002-06-06 19:57:33 +0000701 sensitive_data.external_keysign = 0;
Ben Lindstrom24157572002-06-12 16:09:39 +0000702 if (options.rhosts_rsa_authentication ||
703 options.hostbased_authentication) {
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000704 sensitive_data.nkeys = 3;
Damien Millerddd63ab2006-03-31 23:10:51 +1100705 sensitive_data.keys = xcalloc(sensitive_data.nkeys,
Ben Lindstroma962c2f2002-07-04 00:14:17 +0000706 sizeof(Key));
Ben Lindstromf9c48842002-06-11 16:37:51 +0000707
708 PRIV_START;
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000709 sensitive_data.keys[0] = key_load_private_type(KEY_RSA1,
Darren Tucker232b76f2006-05-06 17:41:51 +1000710 _PATH_HOST_KEY_FILE, "", NULL, NULL);
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000711 sensitive_data.keys[1] = key_load_private_type(KEY_DSA,
Darren Tucker232b76f2006-05-06 17:41:51 +1000712 _PATH_HOST_DSA_KEY_FILE, "", NULL, NULL);
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000713 sensitive_data.keys[2] = key_load_private_type(KEY_RSA,
Darren Tucker232b76f2006-05-06 17:41:51 +1000714 _PATH_HOST_RSA_KEY_FILE, "", NULL, NULL);
Ben Lindstromf9c48842002-06-11 16:37:51 +0000715 PRIV_END;
Ben Lindstrom1bad2562002-06-06 19:57:33 +0000716
Ben Lindstrom5d35a2f2002-07-04 00:19:40 +0000717 if (options.hostbased_authentication == 1 &&
718 sensitive_data.keys[0] == NULL &&
Ben Lindstrom1bad2562002-06-06 19:57:33 +0000719 sensitive_data.keys[1] == NULL &&
720 sensitive_data.keys[2] == NULL) {
721 sensitive_data.keys[1] = key_load_public(
722 _PATH_HOST_DSA_KEY_FILE, NULL);
723 sensitive_data.keys[2] = key_load_public(
724 _PATH_HOST_RSA_KEY_FILE, NULL);
725 sensitive_data.external_keysign = 1;
726 }
Damien Miller95def091999-11-25 00:26:21 +1100727 }
Damien Miller5428f641999-11-25 11:54:57 +1100728 /*
729 * Get rid of any extra privileges that we may have. We will no
730 * longer need them. Also, extra privileges could make it very hard
731 * to read identity files and other non-world-readable files from the
732 * user's home directory if it happens to be on a NFS volume where
733 * root is mapped to nobody.
734 */
Darren Tucker25f60a72004-08-15 17:23:34 +1000735 if (original_effective_uid == 0) {
736 PRIV_START;
737 permanently_set_uid(pw);
738 }
Damien Miller95def091999-11-25 00:26:21 +1100739
Damien Miller5428f641999-11-25 11:54:57 +1100740 /*
741 * Now that we are back to our own permissions, create ~/.ssh
Damien Miller788f2122005-11-05 15:14:59 +1100742 * directory if it doesn't already exist.
Damien Miller5428f641999-11-25 11:54:57 +1100743 */
Ben Lindstrom930b14a2001-08-15 23:19:21 +0000744 snprintf(buf, sizeof buf, "%.100s%s%.100s", pw->pw_dir, strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR);
Damien Miller95def091999-11-25 00:26:21 +1100745 if (stat(buf, &st) < 0)
Damien Millerbe484b52000-07-15 14:14:16 +1000746 if (mkdir(buf, 0700) < 0)
Damien Miller95def091999-11-25 00:26:21 +1100747 error("Could not create directory '%.200s'.", buf);
748
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000749 /* load options.identity_files */
750 load_public_identity_files();
751
752 /* Expand ~ in known host file names. */
753 /* XXX mem-leaks: */
Damien Miller0bc1bd82000-11-13 22:57:25 +1100754 options.system_hostfile =
755 tilde_expand_filename(options.system_hostfile, original_real_uid);
756 options.user_hostfile =
757 tilde_expand_filename(options.user_hostfile, original_real_uid);
758 options.system_hostfile2 =
759 tilde_expand_filename(options.system_hostfile2, original_real_uid);
760 options.user_hostfile2 =
761 tilde_expand_filename(options.user_hostfile2, original_real_uid);
Damien Miller95def091999-11-25 00:26:21 +1100762
Damien Miller07cd5892001-11-12 10:52:03 +1100763 signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
764
Damien Miller95def091999-11-25 00:26:21 +1100765 /* Log into the remote system. This never returns if the login fails. */
Ben Lindstrom1bad2562002-06-06 19:57:33 +0000766 ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr, pw);
Damien Miller95def091999-11-25 00:26:21 +1100767
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000768 /* We no longer need the private host keys. Clear them now. */
769 if (sensitive_data.nkeys != 0) {
770 for (i = 0; i < sensitive_data.nkeys; i++) {
771 if (sensitive_data.keys[i] != NULL) {
772 /* Destroys contents safely */
773 debug3("clear hostkey %d", i);
774 key_free(sensitive_data.keys[i]);
775 sensitive_data.keys[i] = NULL;
776 }
777 }
778 xfree(sensitive_data.keys);
779 }
Ben Lindstroma6c8a8d2001-08-06 21:42:00 +0000780 for (i = 0; i < options.num_identity_files; i++) {
781 if (options.identity_files[i]) {
782 xfree(options.identity_files[i]);
783 options.identity_files[i] = NULL;
784 }
785 if (options.identity_keys[i]) {
786 key_free(options.identity_keys[i]);
787 options.identity_keys[i] = NULL;
788 }
789 }
Damien Miller95def091999-11-25 00:26:21 +1100790
Damien Miller1383bd82000-04-06 12:32:37 +1000791 exit_status = compat20 ? ssh_session2() : ssh_session();
792 packet_close();
Damien Miller8c4e18a2002-09-19 12:05:02 +1000793
Damien Miller0e220db2004-06-15 10:34:08 +1000794 if (options.control_path != NULL && control_fd != -1)
795 unlink(options.control_path);
796
Damien Miller8c4e18a2002-09-19 12:05:02 +1000797 /*
Damien Millera8e06ce2003-11-21 23:48:55 +1100798 * Send SIGHUP to proxy command if used. We don't wait() in
Damien Miller8c4e18a2002-09-19 12:05:02 +1000799 * case it hangs and instead rely on init to reap the child
800 */
801 if (proxy_command_pid > 1)
802 kill(proxy_command_pid, SIGHUP);
803
Damien Miller1383bd82000-04-06 12:32:37 +1000804 return exit_status;
805}
806
Ben Lindstrombba81212001-06-25 05:01:22 +0000807static void
Damien Miller0bc1bd82000-11-13 22:57:25 +1100808ssh_init_forwarding(void)
809{
Kevin Steves12057502001-02-05 14:54:34 +0000810 int success = 0;
Damien Miller0bc1bd82000-11-13 22:57:25 +1100811 int i;
Kevin Steves12057502001-02-05 14:54:34 +0000812
Damien Miller0bc1bd82000-11-13 22:57:25 +1100813 /* Initiate local TCP/IP port forwardings. */
814 for (i = 0; i < options.num_local_forwards; i++) {
Damien Millerf91ee4c2005-03-01 21:24:33 +1100815 debug("Local connections to %.200s:%d forwarded to remote "
816 "address %.200s:%d",
Darren Tucker47eede72005-03-14 23:08:12 +1100817 (options.local_forwards[i].listen_host == NULL) ?
818 (options.gateway_ports ? "*" : "LOCALHOST") :
Damien Millerf91ee4c2005-03-01 21:24:33 +1100819 options.local_forwards[i].listen_host,
820 options.local_forwards[i].listen_port,
821 options.local_forwards[i].connect_host,
822 options.local_forwards[i].connect_port);
Damien Millerb16461c2002-01-22 23:29:22 +1100823 success += channel_setup_local_fwd_listener(
Damien Millerf91ee4c2005-03-01 21:24:33 +1100824 options.local_forwards[i].listen_host,
825 options.local_forwards[i].listen_port,
826 options.local_forwards[i].connect_host,
827 options.local_forwards[i].connect_port,
Damien Miller0bc1bd82000-11-13 22:57:25 +1100828 options.gateway_ports);
829 }
Darren Tuckere7d4b192006-07-12 22:17:10 +1000830 if (i > 0 && success != i && options.exit_on_forward_failure)
831 fatal("Could not request local forwarding.");
Kevin Steves12057502001-02-05 14:54:34 +0000832 if (i > 0 && success == 0)
833 error("Could not request local forwarding.");
Damien Miller0bc1bd82000-11-13 22:57:25 +1100834
835 /* Initiate remote TCP/IP port forwardings. */
836 for (i = 0; i < options.num_remote_forwards; i++) {
Damien Millerf91ee4c2005-03-01 21:24:33 +1100837 debug("Remote connections from %.200s:%d forwarded to "
838 "local address %.200s:%d",
Damien Miller46d38de2005-07-17 17:02:09 +1000839 (options.remote_forwards[i].listen_host == NULL) ?
Damien Milleraa3bb102005-11-05 15:12:59 +1100840 "LOCALHOST" : options.remote_forwards[i].listen_host,
Damien Millerf91ee4c2005-03-01 21:24:33 +1100841 options.remote_forwards[i].listen_port,
842 options.remote_forwards[i].connect_host,
843 options.remote_forwards[i].connect_port);
Darren Tuckere7d4b192006-07-12 22:17:10 +1000844 if (channel_request_remote_forwarding(
Damien Millerf91ee4c2005-03-01 21:24:33 +1100845 options.remote_forwards[i].listen_host,
846 options.remote_forwards[i].listen_port,
847 options.remote_forwards[i].connect_host,
Darren Tuckere7d4b192006-07-12 22:17:10 +1000848 options.remote_forwards[i].connect_port) < 0) {
849 if (options.exit_on_forward_failure)
850 fatal("Could not request remote forwarding.");
851 else
852 logit("Warning: Could not request remote "
853 "forwarding.");
854 }
Damien Miller0bc1bd82000-11-13 22:57:25 +1100855 }
856}
857
Ben Lindstrombba81212001-06-25 05:01:22 +0000858static void
Damien Miller0bc1bd82000-11-13 22:57:25 +1100859check_agent_present(void)
860{
861 if (options.forward_agent) {
Damien Miller788f2122005-11-05 15:14:59 +1100862 /* Clear agent forwarding if we don't have an agent. */
Damien Miller789e95d2002-09-12 09:52:46 +1000863 if (!ssh_agent_present())
Damien Miller0bc1bd82000-11-13 22:57:25 +1100864 options.forward_agent = 0;
Damien Miller0bc1bd82000-11-13 22:57:25 +1100865 }
866}
867
Ben Lindstrombba81212001-06-25 05:01:22 +0000868static int
Damien Miller1383bd82000-04-06 12:32:37 +1000869ssh_session(void)
870{
871 int type;
Damien Miller1383bd82000-04-06 12:32:37 +1000872 int interactive = 0;
873 int have_tty = 0;
874 struct winsize ws;
Damien Miller1383bd82000-04-06 12:32:37 +1000875 char *cp;
Damien Miller17e7ed02005-06-17 12:54:33 +1000876 const char *display;
Damien Miller1383bd82000-04-06 12:32:37 +1000877
Damien Miller95def091999-11-25 00:26:21 +1100878 /* Enable compression if requested. */
879 if (options.compression) {
880 debug("Requesting compression at level %d.", options.compression_level);
881
882 if (options.compression_level < 1 || options.compression_level > 9)
883 fatal("Compression level must be from 1 (fast) to 9 (slow, best).");
884
885 /* Send the request. */
886 packet_start(SSH_CMSG_REQUEST_COMPRESSION);
887 packet_put_int(options.compression_level);
888 packet_send();
889 packet_write_wait();
Damien Millerdff50992002-01-22 23:16:32 +1100890 type = packet_read();
Damien Miller95def091999-11-25 00:26:21 +1100891 if (type == SSH_SMSG_SUCCESS)
892 packet_start_compression(options.compression_level);
893 else if (type == SSH_SMSG_FAILURE)
Damien Miller996acd22003-04-09 20:59:48 +1000894 logit("Warning: Remote host refused compression.");
Damien Miller95def091999-11-25 00:26:21 +1100895 else
896 packet_disconnect("Protocol error waiting for compression response.");
897 }
898 /* Allocate a pseudo tty if appropriate. */
899 if (tty_flag) {
900 debug("Requesting pty.");
901
902 /* Start the packet. */
903 packet_start(SSH_CMSG_REQUEST_PTY);
904
905 /* Store TERM in the packet. There is no limit on the
906 length of the string. */
907 cp = getenv("TERM");
908 if (!cp)
909 cp = "";
Ben Lindstrom664408d2001-06-09 01:42:01 +0000910 packet_put_cstring(cp);
Damien Miller95def091999-11-25 00:26:21 +1100911
912 /* Store window size in the packet. */
913 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
914 memset(&ws, 0, sizeof(ws));
Damien Miller71a73672006-03-26 14:04:36 +1100915 packet_put_int((u_int)ws.ws_row);
916 packet_put_int((u_int)ws.ws_col);
917 packet_put_int((u_int)ws.ws_xpixel);
918 packet_put_int((u_int)ws.ws_ypixel);
Damien Miller95def091999-11-25 00:26:21 +1100919
920 /* Store tty modes in the packet. */
Ben Lindstromae8e2d32001-04-14 23:13:02 +0000921 tty_make_modes(fileno(stdin), NULL);
Damien Miller95def091999-11-25 00:26:21 +1100922
923 /* Send the packet, and wait for it to leave. */
924 packet_send();
925 packet_write_wait();
926
927 /* Read response from the server. */
Damien Millerdff50992002-01-22 23:16:32 +1100928 type = packet_read();
Damien Miller450a7a12000-03-26 13:04:51 +1000929 if (type == SSH_SMSG_SUCCESS) {
Damien Miller95def091999-11-25 00:26:21 +1100930 interactive = 1;
Damien Miller1383bd82000-04-06 12:32:37 +1000931 have_tty = 1;
Damien Miller450a7a12000-03-26 13:04:51 +1000932 } else if (type == SSH_SMSG_FAILURE)
Damien Miller996acd22003-04-09 20:59:48 +1000933 logit("Warning: Remote host failed or refused to allocate a pseudo tty.");
Damien Miller95def091999-11-25 00:26:21 +1100934 else
935 packet_disconnect("Protocol error waiting for pty request response.");
936 }
937 /* Request X11 forwarding if enabled and DISPLAY is set. */
Damien Miller17e7ed02005-06-17 12:54:33 +1000938 display = getenv("DISPLAY");
939 if (options.forward_x11 && display != NULL) {
Ben Lindstrom4a4bd712001-12-06 17:45:19 +0000940 char *proto, *data;
Damien Millerbd483e72000-04-30 10:00:53 +1000941 /* Get reasonable local authentication information. */
Damien Miller17e7ed02005-06-17 12:54:33 +1000942 client_x11_get_proto(display, options.xauth_location,
943 options.forward_x11_trusted, &proto, &data);
Damien Millerbd483e72000-04-30 10:00:53 +1000944 /* Request forwarding with authentication spoofing. */
Damien Miller95def091999-11-25 00:26:21 +1100945 debug("Requesting X11 forwarding with authentication spoofing.");
Damien Miller17e7ed02005-06-17 12:54:33 +1000946 x11_request_forwarding_with_spoofing(0, display, proto, data);
Damien Miller95def091999-11-25 00:26:21 +1100947
948 /* Read response from the server. */
Damien Millerdff50992002-01-22 23:16:32 +1100949 type = packet_read();
Damien Miller95def091999-11-25 00:26:21 +1100950 if (type == SSH_SMSG_SUCCESS) {
Damien Miller95def091999-11-25 00:26:21 +1100951 interactive = 1;
Damien Millerbd483e72000-04-30 10:00:53 +1000952 } else if (type == SSH_SMSG_FAILURE) {
Damien Miller996acd22003-04-09 20:59:48 +1000953 logit("Warning: Remote host denied X11 forwarding.");
Damien Millerbd483e72000-04-30 10:00:53 +1000954 } else {
Damien Miller95def091999-11-25 00:26:21 +1100955 packet_disconnect("Protocol error waiting for X11 forwarding");
Damien Millerbd483e72000-04-30 10:00:53 +1000956 }
Damien Miller95def091999-11-25 00:26:21 +1100957 }
958 /* Tell the packet module whether this is an interactive session. */
Ben Lindstrombf555ba2001-01-18 02:04:35 +0000959 packet_set_interactive(interactive);
Damien Miller95def091999-11-25 00:26:21 +1100960
961 /* Request authentication agent forwarding if appropriate. */
Damien Miller0bc1bd82000-11-13 22:57:25 +1100962 check_agent_present();
963
Damien Miller95def091999-11-25 00:26:21 +1100964 if (options.forward_agent) {
965 debug("Requesting authentication agent forwarding.");
966 auth_request_forwarding();
967
968 /* Read response from the server. */
Damien Millerdff50992002-01-22 23:16:32 +1100969 type = packet_read();
Damien Miller48b03fc2002-01-22 23:11:40 +1100970 packet_check_eom();
Damien Miller95def091999-11-25 00:26:21 +1100971 if (type != SSH_SMSG_SUCCESS)
Damien Miller996acd22003-04-09 20:59:48 +1000972 logit("Warning: Remote host denied authentication agent forwarding.");
Damien Miller95def091999-11-25 00:26:21 +1100973 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000974
Damien Miller0bc1bd82000-11-13 22:57:25 +1100975 /* Initiate port forwardings. */
976 ssh_init_forwarding();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000977
Damien Miller5428f641999-11-25 11:54:57 +1100978 /* If requested, let ssh continue in the background. */
Damien Miller4af51302000-04-16 11:18:38 +1000979 if (fork_after_authentication_flag)
Damien Miller5428f641999-11-25 11:54:57 +1100980 if (daemon(1, 1) < 0)
981 fatal("daemon() failed: %.200s", strerror(errno));
982
983 /*
984 * If a command was specified on the command line, execute the
985 * command now. Otherwise request the server to start a shell.
986 */
Damien Miller95def091999-11-25 00:26:21 +1100987 if (buffer_len(&command) > 0) {
988 int len = buffer_len(&command);
989 if (len > 900)
990 len = 900;
Damien Miller5a6b4fe2001-12-21 14:56:54 +1100991 debug("Sending command: %.*s", len, (u_char *)buffer_ptr(&command));
Damien Miller95def091999-11-25 00:26:21 +1100992 packet_start(SSH_CMSG_EXEC_CMD);
993 packet_put_string(buffer_ptr(&command), buffer_len(&command));
994 packet_send();
995 packet_write_wait();
996 } else {
997 debug("Requesting shell.");
998 packet_start(SSH_CMSG_EXEC_SHELL);
999 packet_send();
1000 packet_write_wait();
1001 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001002
Damien Miller95def091999-11-25 00:26:21 +11001003 /* Enter the interactive session. */
Ben Lindstrom2b1f71b2001-06-05 20:32:21 +00001004 return client_loop(have_tty, tty_flag ?
1005 options.escape_char : SSH_ESCAPECHAR_NONE, 0);
Damien Miller1383bd82000-04-06 12:32:37 +10001006}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001007
Ben Lindstrombba81212001-06-25 05:01:22 +00001008static void
Damien Miller0e220db2004-06-15 10:34:08 +10001009ssh_subsystem_reply(int type, u_int32_t seq, void *ctxt)
Ben Lindstrom1e7d3062001-02-09 02:36:43 +00001010{
1011 int id, len;
1012
1013 id = packet_get_int();
1014 len = buffer_len(&command);
Ben Lindstrom4040fe12001-03-05 06:52:57 +00001015 if (len > 900)
1016 len = 900;
Damien Miller48b03fc2002-01-22 23:11:40 +11001017 packet_check_eom();
Ben Lindstrom1e7d3062001-02-09 02:36:43 +00001018 if (type == SSH2_MSG_CHANNEL_FAILURE)
1019 fatal("Request for subsystem '%.*s' failed on channel %d",
Damien Miller5a6b4fe2001-12-21 14:56:54 +11001020 len, (u_char *)buffer_ptr(&command), id);
Ben Lindstrom1e7d3062001-02-09 02:36:43 +00001021}
1022
Damien Miller2797f7f2002-04-23 21:09:44 +10001023void
Damien Miller509b0102003-12-17 16:33:10 +11001024client_global_request_reply_fwd(int type, u_int32_t seq, void *ctxt)
Damien Miller2797f7f2002-04-23 21:09:44 +10001025{
1026 int i;
1027
1028 i = client_global_request_id++;
Damien Miller509b0102003-12-17 16:33:10 +11001029 if (i >= options.num_remote_forwards)
Damien Miller2797f7f2002-04-23 21:09:44 +10001030 return;
Damien Miller2797f7f2002-04-23 21:09:44 +10001031 debug("remote forward %s for: listen %d, connect %s:%d",
1032 type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
Damien Millerf91ee4c2005-03-01 21:24:33 +11001033 options.remote_forwards[i].listen_port,
1034 options.remote_forwards[i].connect_host,
1035 options.remote_forwards[i].connect_port);
Darren Tuckere7d4b192006-07-12 22:17:10 +10001036 if (type == SSH2_MSG_REQUEST_FAILURE) {
1037 if (options.exit_on_forward_failure)
1038 fatal("Error: remote port forwarding failed for "
1039 "listen port %d",
1040 options.remote_forwards[i].listen_port);
1041 else
1042 logit("Warning: remote port forwarding failed for "
1043 "listen port %d",
1044 options.remote_forwards[i].listen_port);
1045 }
Damien Miller2797f7f2002-04-23 21:09:44 +10001046}
1047
Damien Miller0e220db2004-06-15 10:34:08 +10001048static void
1049ssh_control_listener(void)
1050{
1051 struct sockaddr_un addr;
1052 mode_t old_umask;
Damien Miller07b6ff12004-06-15 11:14:45 +10001053 int addr_len;
1054
Damien Millerd14b1e72005-06-16 13:19:41 +10001055 if (options.control_path == NULL ||
1056 options.control_master == SSHCTL_MASTER_NO)
Damien Miller0e220db2004-06-15 10:34:08 +10001057 return;
1058
Damien Millerd14b1e72005-06-16 13:19:41 +10001059 debug("setting up multiplex master socket");
1060
Damien Miller0e220db2004-06-15 10:34:08 +10001061 memset(&addr, '\0', sizeof(addr));
1062 addr.sun_family = AF_UNIX;
Damien Miller07b6ff12004-06-15 11:14:45 +10001063 addr_len = offsetof(struct sockaddr_un, sun_path) +
Damien Miller0e220db2004-06-15 10:34:08 +10001064 strlen(options.control_path) + 1;
1065
1066 if (strlcpy(addr.sun_path, options.control_path,
1067 sizeof(addr.sun_path)) >= sizeof(addr.sun_path))
1068 fatal("ControlPath too long");
1069
1070 if ((control_fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0)
Damien Miller15d72a02005-11-05 15:07:33 +11001071 fatal("%s socket(): %s", __func__, strerror(errno));
Damien Miller0e220db2004-06-15 10:34:08 +10001072
1073 old_umask = umask(0177);
Damien Miller90967402006-03-26 14:07:26 +11001074 if (bind(control_fd, (struct sockaddr *)&addr, addr_len) == -1) {
Damien Miller0e220db2004-06-15 10:34:08 +10001075 control_fd = -1;
Damien Miller4f10e252005-05-04 15:33:09 +10001076 if (errno == EINVAL || errno == EADDRINUSE)
Damien Miller0e220db2004-06-15 10:34:08 +10001077 fatal("ControlSocket %s already exists",
1078 options.control_path);
1079 else
Damien Miller15d72a02005-11-05 15:07:33 +11001080 fatal("%s bind(): %s", __func__, strerror(errno));
Damien Miller0e220db2004-06-15 10:34:08 +10001081 }
1082 umask(old_umask);
1083
1084 if (listen(control_fd, 64) == -1)
Damien Miller15d72a02005-11-05 15:07:33 +11001085 fatal("%s listen(): %s", __func__, strerror(errno));
Damien Miller0e220db2004-06-15 10:34:08 +10001086
1087 set_nonblock(control_fd);
1088}
1089
Ben Lindstromf558cf62001-09-20 23:13:49 +00001090/* request pty/x11/agent/tcpfwd/shell for channel */
Ben Lindstrombba81212001-06-25 05:01:22 +00001091static void
Ben Lindstromf558cf62001-09-20 23:13:49 +00001092ssh_session2_setup(int id, void *arg)
Damien Miller1383bd82000-04-06 12:32:37 +10001093{
Damien Miller3756dce2004-06-18 01:17:29 +10001094 extern char **environ;
Damien Miller17e7ed02005-06-17 12:54:33 +10001095 const char *display;
Damien Miller0e220db2004-06-15 10:34:08 +10001096 int interactive = tty_flag;
Damien Miller17e7ed02005-06-17 12:54:33 +10001097
Damien Miller46d38de2005-07-17 17:02:09 +10001098 display = getenv("DISPLAY");
Damien Miller17e7ed02005-06-17 12:54:33 +10001099 if (options.forward_x11 && display != NULL) {
Ben Lindstrom4a4bd712001-12-06 17:45:19 +00001100 char *proto, *data;
Damien Millerbd483e72000-04-30 10:00:53 +10001101 /* Get reasonable local authentication information. */
Damien Miller17e7ed02005-06-17 12:54:33 +10001102 client_x11_get_proto(display, options.xauth_location,
1103 options.forward_x11_trusted, &proto, &data);
Damien Millerbd483e72000-04-30 10:00:53 +10001104 /* Request forwarding with authentication spoofing. */
1105 debug("Requesting X11 forwarding with authentication spoofing.");
Damien Miller17e7ed02005-06-17 12:54:33 +10001106 x11_request_forwarding_with_spoofing(id, display, proto, data);
Ben Lindstrombf555ba2001-01-18 02:04:35 +00001107 interactive = 1;
Damien Millerbd483e72000-04-30 10:00:53 +10001108 /* XXX wait for reply */
1109 }
1110
Damien Miller0bc1bd82000-11-13 22:57:25 +11001111 check_agent_present();
1112 if (options.forward_agent) {
1113 debug("Requesting authentication agent forwarding.");
1114 channel_request_start(id, "auth-agent-req@openssh.com", 0);
1115 packet_send();
1116 }
1117
Damien Miller7b58e802005-12-13 19:33:19 +11001118 if (options.tun_open != SSH_TUNMODE_NO) {
Damien Millerd27b9472005-12-13 19:29:02 +11001119 Channel *c;
1120 int fd;
1121
1122 debug("Requesting tun.");
Damien Miller7b58e802005-12-13 19:33:19 +11001123 if ((fd = tun_open(options.tun_local,
1124 options.tun_open)) >= 0) {
Damien Millerd27b9472005-12-13 19:29:02 +11001125 c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1,
1126 CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT,
1127 0, "tun", 1);
1128 c->datagram = 1;
Damien Miller598bbc22005-12-31 16:33:36 +11001129#if defined(SSH_TUN_FILTER)
1130 if (options.tun_open == SSH_TUNMODE_POINTOPOINT)
1131 channel_register_filter(c->self, sys_tun_infilter,
1132 sys_tun_outfilter);
1133#endif
Damien Millerd27b9472005-12-13 19:29:02 +11001134 packet_start(SSH2_MSG_CHANNEL_OPEN);
1135 packet_put_cstring("tun@openssh.com");
1136 packet_put_int(c->self);
1137 packet_put_int(c->local_window_max);
1138 packet_put_int(c->local_maxpacket);
Damien Miller7b58e802005-12-13 19:33:19 +11001139 packet_put_int(options.tun_open);
Damien Millerd27b9472005-12-13 19:29:02 +11001140 packet_put_int(options.tun_remote);
1141 packet_send();
1142 }
1143 }
1144
Damien Miller0e220db2004-06-15 10:34:08 +10001145 client_session2_setup(id, tty_flag, subsystem_flag, getenv("TERM"),
Damien Miller3756dce2004-06-18 01:17:29 +10001146 NULL, fileno(stdin), &command, environ, &ssh_subsystem_reply);
Ben Lindstrom1e7d3062001-02-09 02:36:43 +00001147
Ben Lindstrombf555ba2001-01-18 02:04:35 +00001148 packet_set_interactive(interactive);
Damien Miller1383bd82000-04-06 12:32:37 +10001149}
1150
Ben Lindstromf558cf62001-09-20 23:13:49 +00001151/* open new channel for a session */
Ben Lindstrombba81212001-06-25 05:01:22 +00001152static int
Ben Lindstromf558cf62001-09-20 23:13:49 +00001153ssh_session2_open(void)
Damien Miller1383bd82000-04-06 12:32:37 +10001154{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001155 Channel *c;
1156 int window, packetmax, in, out, err;
Damien Millerad833b32000-08-23 10:46:23 +10001157
Damien Millercaf6dd62000-08-29 11:33:50 +11001158 if (stdin_null_flag) {
Ben Lindstrom31ca54a2001-02-09 02:11:24 +00001159 in = open(_PATH_DEVNULL, O_RDONLY);
Damien Millercaf6dd62000-08-29 11:33:50 +11001160 } else {
1161 in = dup(STDIN_FILENO);
1162 }
1163 out = dup(STDOUT_FILENO);
1164 err = dup(STDERR_FILENO);
1165
1166 if (in < 0 || out < 0 || err < 0)
1167 fatal("dup() in/out/err failed");
1168
Damien Miller69b69aa2000-10-28 14:19:58 +11001169 /* enable nonblocking unless tty */
1170 if (!isatty(in))
1171 set_nonblock(in);
1172 if (!isatty(out))
1173 set_nonblock(out);
1174 if (!isatty(err))
1175 set_nonblock(err);
1176
Damien Millere4340be2000-09-16 13:29:08 +11001177 window = CHAN_SES_WINDOW_DEFAULT;
1178 packetmax = CHAN_SES_PACKET_DEFAULT;
Damien Miller19a59452002-02-19 15:20:57 +11001179 if (tty_flag) {
1180 window >>= 1;
1181 packetmax >>= 1;
Damien Miller1383bd82000-04-06 12:32:37 +10001182 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001183 c = channel_new(
Damien Miller1383bd82000-04-06 12:32:37 +10001184 "session", SSH_CHANNEL_OPENING, in, out, err,
Damien Millere4340be2000-09-16 13:29:08 +11001185 window, packetmax, CHAN_EXTENDED_WRITE,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10001186 "client-session", /*nonblock*/0);
Damien Miller1383bd82000-04-06 12:32:37 +10001187
Ben Lindstromf558cf62001-09-20 23:13:49 +00001188 debug3("ssh_session2_open: channel_new: %d", c->self);
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001189
Ben Lindstrom5ec26452001-06-09 00:18:51 +00001190 channel_send_open(c->self);
Ben Lindstromf558cf62001-09-20 23:13:49 +00001191 if (!no_shell_flag)
Damien Miller0e220db2004-06-15 10:34:08 +10001192 channel_register_confirm(c->self, ssh_session2_setup, NULL);
Damien Miller1383bd82000-04-06 12:32:37 +10001193
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001194 return c->self;
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001195}
1196
Ben Lindstrombba81212001-06-25 05:01:22 +00001197static int
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001198ssh_session2(void)
1199{
Ben Lindstromf558cf62001-09-20 23:13:49 +00001200 int id = -1;
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001201
1202 /* XXX should be pre-session */
1203 ssh_init_forwarding();
Damien Miller0e220db2004-06-15 10:34:08 +10001204 ssh_control_listener();
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001205
Ben Lindstromf558cf62001-09-20 23:13:49 +00001206 if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN))
1207 id = ssh_session2_open();
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001208
Damien Millerd27b9472005-12-13 19:29:02 +11001209 /* Execute a local command */
1210 if (options.local_command != NULL &&
1211 options.permit_local_command)
1212 ssh_local_cmd(options.local_command);
1213
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001214 /* If requested, let ssh continue in the background. */
1215 if (fork_after_authentication_flag)
1216 if (daemon(1, 1) < 0)
1217 fatal("daemon() failed: %.200s", strerror(errno));
1218
Ben Lindstrom2b1f71b2001-06-05 20:32:21 +00001219 return client_loop(tty_flag, tty_flag ?
1220 options.escape_char : SSH_ESCAPECHAR_NONE, id);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001221}
Damien Miller0bc1bd82000-11-13 22:57:25 +11001222
Ben Lindstrombba81212001-06-25 05:01:22 +00001223static void
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001224load_public_identity_files(void)
1225{
Damien Miller6b1d53c2006-03-31 23:13:21 +11001226 char *filename, *cp, thishost[NI_MAXHOST];
Ben Lindstrom711b04a2001-08-06 21:12:42 +00001227 int i = 0;
Ben Lindstrom0936a5b2002-03-26 03:17:42 +00001228 Key *public;
Damien Miller6b1d53c2006-03-31 23:13:21 +11001229 struct passwd *pw;
Ben Lindstrom711b04a2001-08-06 21:12:42 +00001230#ifdef SMARTCARD
Ben Lindstrom0936a5b2002-03-26 03:17:42 +00001231 Key **keys;
1232
Ben Lindstromf7db3bb2001-08-06 21:35:51 +00001233 if (options.smartcard_device != NULL &&
Ben Lindstrom0936a5b2002-03-26 03:17:42 +00001234 options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
Damien Miller4dec5d72006-08-05 11:38:40 +10001235 (keys = sc_get_keys(options.smartcard_device, NULL)) != NULL) {
Ben Lindstrom0936a5b2002-03-26 03:17:42 +00001236 int count = 0;
1237 for (i = 0; keys[i] != NULL; i++) {
1238 count++;
Ben Lindstrom0936a5b2002-03-26 03:17:42 +00001239 memmove(&options.identity_files[1], &options.identity_files[0],
1240 sizeof(char *) * (SSH_MAX_IDENTITY_FILES - 1));
1241 memmove(&options.identity_keys[1], &options.identity_keys[0],
1242 sizeof(Key *) * (SSH_MAX_IDENTITY_FILES - 1));
1243 options.num_identity_files++;
1244 options.identity_keys[0] = keys[i];
Damien Miller56a0bb02003-06-18 20:28:40 +10001245 options.identity_files[0] = sc_get_key_label(keys[i]);
Ben Lindstrom0936a5b2002-03-26 03:17:42 +00001246 }
Ben Lindstrom4f054602002-03-26 03:23:00 +00001247 if (options.num_identity_files > SSH_MAX_IDENTITY_FILES)
1248 options.num_identity_files = SSH_MAX_IDENTITY_FILES;
Ben Lindstrom0936a5b2002-03-26 03:17:42 +00001249 i = count;
1250 xfree(keys);
Ben Lindstrom711b04a2001-08-06 21:12:42 +00001251 }
Ben Lindstromffce1472001-08-06 21:57:31 +00001252#endif /* SMARTCARD */
Damien Miller6b1d53c2006-03-31 23:13:21 +11001253 if ((pw = getpwuid(original_real_uid)) == NULL)
1254 fatal("load_public_identity_files: getpwuid failed");
1255 if (gethostname(thishost, sizeof(thishost)) == -1)
1256 fatal("load_public_identity_files: gethostname: %s",
1257 strerror(errno));
Ben Lindstrom711b04a2001-08-06 21:12:42 +00001258 for (; i < options.num_identity_files; i++) {
Damien Miller6b1d53c2006-03-31 23:13:21 +11001259 cp = tilde_expand_filename(options.identity_files[i],
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001260 original_real_uid);
Damien Miller6b1d53c2006-03-31 23:13:21 +11001261 filename = percent_expand(cp, "d", pw->pw_dir,
Damien Millerd7834352006-08-05 12:39:39 +10001262 "u", pw->pw_name, "l", thishost, "h", host,
Damien Miller6b1d53c2006-03-31 23:13:21 +11001263 "r", options.user, (char *)NULL);
1264 xfree(cp);
Ben Lindstromd0fca422001-03-26 13:44:06 +00001265 public = key_load_public(filename, NULL);
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001266 debug("identity file %s type %d", filename,
1267 public ? public->type : -1);
1268 xfree(options.identity_files[i]);
1269 options.identity_files[i] = filename;
1270 options.identity_keys[i] = public;
1271 }
1272}
Damien Miller0e220db2004-06-15 10:34:08 +10001273
1274static void
1275control_client_sighandler(int signo)
1276{
1277 control_client_terminate = signo;
1278}
1279
1280static void
1281control_client_sigrelay(int signo)
1282{
1283 if (control_server_pid > 1)
1284 kill(control_server_pid, signo);
1285}
1286
Darren Tucker365433f2004-06-22 12:29:23 +10001287static int
1288env_permitted(char *env)
1289{
Darren Tucker284706a2006-07-12 22:16:23 +10001290 int i, ret;
Darren Tucker365433f2004-06-22 12:29:23 +10001291 char name[1024], *cp;
1292
Darren Tucker284706a2006-07-12 22:16:23 +10001293 if ((cp = strchr(env, '=')) == NULL || cp == env)
Darren Tucker365433f2004-06-22 12:29:23 +10001294 return (0);
Darren Tucker57f42242006-07-12 22:23:35 +10001295 ret = snprintf(name, sizeof(name), "%.*s", (int)(cp - env), env);
Darren Tucker284706a2006-07-12 22:16:23 +10001296 if (ret <= 0 || (size_t)ret >= sizeof(name))
1297 fatal("env_permitted: name '%.100s...' too long", env);
Darren Tucker365433f2004-06-22 12:29:23 +10001298
1299 for (i = 0; i < options.num_send_env; i++)
1300 if (match_pattern(name, options.send_env[i]))
1301 return (1);
1302
1303 return (0);
1304}
1305
Damien Miller0e220db2004-06-15 10:34:08 +10001306static void
1307control_client(const char *path)
1308{
1309 struct sockaddr_un addr;
Darren Tucker39207a42004-11-05 20:19:51 +11001310 int i, r, fd, sock, exitval, num_env, addr_len;
Damien Miller0e220db2004-06-15 10:34:08 +10001311 Buffer m;
Darren Tucker7ebfc102004-11-07 20:06:19 +11001312 char *term;
Damien Miller3756dce2004-06-18 01:17:29 +10001313 extern char **environ;
Darren Tucker7ebfc102004-11-07 20:06:19 +11001314 u_int flags;
Darren Tuckerfc959702004-07-17 16:12:08 +10001315
Damien Millerd14b1e72005-06-16 13:19:41 +10001316 if (mux_command == 0)
1317 mux_command = SSHMUX_COMMAND_OPEN;
1318
1319 switch (options.control_master) {
1320 case SSHCTL_MASTER_AUTO:
1321 case SSHCTL_MASTER_AUTO_ASK:
1322 debug("auto-mux: Trying existing master");
1323 /* FALLTHROUGH */
1324 case SSHCTL_MASTER_NO:
1325 break;
1326 default:
1327 return;
1328 }
1329
Damien Miller0e220db2004-06-15 10:34:08 +10001330 memset(&addr, '\0', sizeof(addr));
1331 addr.sun_family = AF_UNIX;
Damien Miller07b6ff12004-06-15 11:14:45 +10001332 addr_len = offsetof(struct sockaddr_un, sun_path) +
Damien Miller0e220db2004-06-15 10:34:08 +10001333 strlen(path) + 1;
1334
1335 if (strlcpy(addr.sun_path, path,
1336 sizeof(addr.sun_path)) >= sizeof(addr.sun_path))
1337 fatal("ControlPath too long");
1338
1339 if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) < 0)
1340 fatal("%s socket(): %s", __func__, strerror(errno));
1341
Damien Miller90967402006-03-26 14:07:26 +11001342 if (connect(sock, (struct sockaddr *)&addr, addr_len) == -1) {
Darren Tucker0814d312005-06-01 23:08:51 +10001343 if (mux_command != SSHMUX_COMMAND_OPEN) {
1344 fatal("Control socket connect(%.100s): %s", path,
1345 strerror(errno));
1346 }
Damien Miller538c9b72005-05-26 12:11:28 +10001347 if (errno == ENOENT)
Damien Miller4662d342006-03-26 13:59:59 +11001348 debug("Control socket \"%.100s\" does not exist", path);
Damien Miller538c9b72005-05-26 12:11:28 +10001349 else {
Damien Miller4662d342006-03-26 13:59:59 +11001350 error("Control socket connect(%.100s): %s", path,
Damien Miller538c9b72005-05-26 12:11:28 +10001351 strerror(errno));
1352 }
Damien Miller4662d342006-03-26 13:59:59 +11001353 close(sock);
1354 return;
1355 }
Damien Miller46d38de2005-07-17 17:02:09 +10001356
Damien Miller4662d342006-03-26 13:59:59 +11001357 if (stdin_null_flag) {
1358 if ((fd = open(_PATH_DEVNULL, O_RDONLY)) == -1)
1359 fatal("open(/dev/null): %s", strerror(errno));
1360 if (dup2(fd, STDIN_FILENO) == -1)
1361 fatal("dup2: %s", strerror(errno));
1362 if (fd > STDERR_FILENO)
1363 close(fd);
1364 }
Damien Miller46d38de2005-07-17 17:02:09 +10001365
Damien Miller13390022005-07-06 09:44:19 +10001366 term = getenv("TERM");
Darren Tucker7ebfc102004-11-07 20:06:19 +11001367
1368 flags = 0;
1369 if (tty_flag)
1370 flags |= SSHMUX_FLAG_TTY;
1371 if (subsystem_flag)
1372 flags |= SSHMUX_FLAG_SUBSYS;
Damien Miller13390022005-07-06 09:44:19 +10001373 if (options.forward_x11)
1374 flags |= SSHMUX_FLAG_X11_FWD;
1375 if (options.forward_agent)
1376 flags |= SSHMUX_FLAG_AGENT_FWD;
Damien Miller0e220db2004-06-15 10:34:08 +10001377
Damien Miller0e220db2004-06-15 10:34:08 +10001378 buffer_init(&m);
1379
Darren Tucker7ebfc102004-11-07 20:06:19 +11001380 /* Send our command to server */
1381 buffer_put_int(&m, mux_command);
1382 buffer_put_int(&m, flags);
Damien Miller13390022005-07-06 09:44:19 +10001383 if (ssh_msg_send(sock, SSHMUX_VER, &m) == -1)
Darren Tucker7ebfc102004-11-07 20:06:19 +11001384 fatal("%s: msg_send", __func__);
1385 buffer_clear(&m);
1386
1387 /* Get authorisation status and PID of controlee */
Damien Miller0e220db2004-06-15 10:34:08 +10001388 if (ssh_msg_recv(sock, &m) == -1)
1389 fatal("%s: msg_recv", __func__);
Damien Miller13390022005-07-06 09:44:19 +10001390 if (buffer_get_char(&m) != SSHMUX_VER)
Damien Miller0e220db2004-06-15 10:34:08 +10001391 fatal("%s: wrong version", __func__);
Damien Miller23f07702004-06-18 01:19:03 +10001392 if (buffer_get_int(&m) != 1)
1393 fatal("Connection to master denied");
Damien Miller0e220db2004-06-15 10:34:08 +10001394 control_server_pid = buffer_get_int(&m);
1395
Damien Miller0e220db2004-06-15 10:34:08 +10001396 buffer_clear(&m);
Damien Miller0e220db2004-06-15 10:34:08 +10001397
Darren Tucker7ebfc102004-11-07 20:06:19 +11001398 switch (mux_command) {
1399 case SSHMUX_COMMAND_ALIVE_CHECK:
Darren Tucker47eede72005-03-14 23:08:12 +11001400 fprintf(stderr, "Master running (pid=%d)\r\n",
Darren Tucker7ebfc102004-11-07 20:06:19 +11001401 control_server_pid);
1402 exit(0);
1403 case SSHMUX_COMMAND_TERMINATE:
1404 fprintf(stderr, "Exit request sent.\r\n");
1405 exit(0);
1406 case SSHMUX_COMMAND_OPEN:
1407 /* continue below */
1408 break;
1409 default:
1410 fatal("silly mux_command %d", mux_command);
1411 }
1412
1413 /* SSHMUX_COMMAND_OPEN */
Damien Miller13390022005-07-06 09:44:19 +10001414 buffer_put_cstring(&m, term ? term : "");
Damien Miller0e220db2004-06-15 10:34:08 +10001415 buffer_append(&command, "\0", 1);
1416 buffer_put_cstring(&m, buffer_ptr(&command));
1417
Darren Tucker365433f2004-06-22 12:29:23 +10001418 if (options.num_send_env == 0 || environ == NULL) {
1419 buffer_put_int(&m, 0);
Darren Tuckerfc959702004-07-17 16:12:08 +10001420 } else {
Darren Tucker365433f2004-06-22 12:29:23 +10001421 /* Pass environment */
1422 num_env = 0;
1423 for (i = 0; environ[i] != NULL; i++)
1424 if (env_permitted(environ[i]))
1425 num_env++; /* Count */
Darren Tuckerfc959702004-07-17 16:12:08 +10001426
Darren Tucker365433f2004-06-22 12:29:23 +10001427 buffer_put_int(&m, num_env);
1428
Darren Tuckerb5bc1a62004-06-24 00:34:53 +10001429 for (i = 0; environ[i] != NULL && num_env >= 0; i++)
1430 if (env_permitted(environ[i])) {
1431 num_env--;
Darren Tucker365433f2004-06-22 12:29:23 +10001432 buffer_put_cstring(&m, environ[i]);
Darren Tuckerb5bc1a62004-06-24 00:34:53 +10001433 }
Darren Tucker365433f2004-06-22 12:29:23 +10001434 }
Damien Miller3756dce2004-06-18 01:17:29 +10001435
Damien Miller13390022005-07-06 09:44:19 +10001436 if (ssh_msg_send(sock, SSHMUX_VER, &m) == -1)
Damien Miller0e220db2004-06-15 10:34:08 +10001437 fatal("%s: msg_send", __func__);
1438
1439 mm_send_fd(sock, STDIN_FILENO);
1440 mm_send_fd(sock, STDOUT_FILENO);
1441 mm_send_fd(sock, STDERR_FILENO);
1442
1443 /* Wait for reply, so master has a chance to gather ttymodes */
1444 buffer_clear(&m);
1445 if (ssh_msg_recv(sock, &m) == -1)
1446 fatal("%s: msg_recv", __func__);
Damien Miller13390022005-07-06 09:44:19 +10001447 if (buffer_get_char(&m) != SSHMUX_VER)
Darren Tucker7ebfc102004-11-07 20:06:19 +11001448 fatal("%s: wrong version", __func__);
Damien Miller0e220db2004-06-15 10:34:08 +10001449 buffer_free(&m);
1450
Darren Tucker07336da2004-11-05 20:02:16 +11001451 signal(SIGHUP, control_client_sighandler);
Damien Miller0809e232004-06-18 22:20:57 +10001452 signal(SIGINT, control_client_sighandler);
1453 signal(SIGTERM, control_client_sighandler);
1454 signal(SIGWINCH, control_client_sigrelay);
1455
Damien Miller0e220db2004-06-15 10:34:08 +10001456 if (tty_flag)
1457 enter_raw_mode();
1458
1459 /* Stick around until the controlee closes the client_fd */
1460 exitval = 0;
1461 for (;!control_client_terminate;) {
1462 r = read(sock, &exitval, sizeof(exitval));
1463 if (r == 0) {
1464 debug2("Received EOF from master");
1465 break;
1466 }
1467 if (r > 0)
1468 debug2("Received exit status from master %d", exitval);
1469 if (r == -1 && errno != EINTR)
1470 fatal("%s: read %s", __func__, strerror(errno));
1471 }
1472
1473 if (control_client_terminate)
1474 debug2("Exiting on signal %d", control_client_terminate);
1475
1476 close(sock);
1477
1478 leave_raw_mode();
1479
1480 if (tty_flag && options.log_level != SYSLOG_LEVEL_QUIET)
1481 fprintf(stderr, "Connection to master closed.\r\n");
1482
1483 exit(exitval);
1484}