blob: 6625557bdb13176bb862d08ddc9e56c428de7dca [file] [log] [blame]
Damien Miller4b3ed642014-07-02 15:29:40 +10001/* $OpenBSD: ssh.c,v 1.404 2014/06/27 16:41:56 markus Exp $ */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002/*
Damien Miller95def091999-11-25 00:26:21 +11003 * Author: Tatu Ylonen <ylo@cs.hut.fi>
4 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5 * All rights reserved
Damien Miller95def091999-11-25 00:26:21 +11006 * Ssh client program. This program can be used to log into a remote machine.
7 * The software supports strong authentication, encryption, and forwarding
8 * of X11, TCP/IP, and authentication connections.
9 *
Damien Millere4340be2000-09-16 13:29:08 +110010 * As far as I am concerned, the code I have written for this software
11 * can be used freely for any purpose. Any derived versions of this
12 * software must be clearly marked as such, and if the derived work is
13 * incompatible with the protocol description in the RFC file, it must be
14 * called by a name other than "ssh" or "Secure Shell".
15 *
16 * Copyright (c) 1999 Niels Provos. All rights reserved.
Darren Tucker0a118da2003-10-15 15:54:32 +100017 * Copyright (c) 2000, 2001, 2002, 2003 Markus Friedl. All rights reserved.
Damien Millere4340be2000-09-16 13:29:08 +110018 *
19 * Modified to work with SSL by Niels Provos <provos@citi.umich.edu>
20 * in Canada (German citizen).
21 *
22 * Redistribution and use in source and binary forms, with or without
23 * modification, are permitted provided that the following conditions
24 * are met:
25 * 1. Redistributions of source code must retain the above copyright
26 * notice, this list of conditions and the following disclaimer.
27 * 2. Redistributions in binary form must reproduce the above copyright
28 * notice, this list of conditions and the following disclaimer in the
29 * documentation and/or other materials provided with the distribution.
30 *
31 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
32 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
33 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
34 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
35 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
36 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
37 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
38 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
39 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
40 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Damien Miller95def091999-11-25 00:26:21 +110041 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100042
43#include "includes.h"
Damien Millercd4223c2006-03-15 11:22:47 +110044
Damien Millerf17883e2006-03-15 11:45:54 +110045#include <sys/types.h>
46#ifdef HAVE_SYS_STAT_H
47# include <sys/stat.h>
48#endif
Damien Millercd4223c2006-03-15 11:22:47 +110049#include <sys/resource.h>
Damien Miller17e91c02006-03-15 11:28:34 +110050#include <sys/ioctl.h>
Darren Tucker199b1342009-07-06 07:16:56 +100051#include <sys/param.h>
Damien Millere3b60b52006-07-10 21:08:03 +100052#include <sys/socket.h>
Damien Miller857b02e2010-09-24 22:02:56 +100053#include <sys/wait.h>
Damien Miller03e20032006-03-15 11:16:59 +110054
Damien Millerc7b06362006-03-15 11:53:45 +110055#include <ctype.h>
Darren Tuckerba724052006-07-12 22:24:22 +100056#include <errno.h>
Damien Miller57cf6382006-07-10 21:13:46 +100057#include <fcntl.h>
Damien Millerb8fe89c2006-07-24 14:51:00 +100058#include <netdb.h>
Damien Miller6645e7a2006-03-15 14:42:54 +110059#ifdef HAVE_PATHS_H
Damien Miller03e20032006-03-15 11:16:59 +110060#include <paths.h>
Damien Miller6645e7a2006-03-15 14:42:54 +110061#endif
Damien Miller9f2abc42006-07-10 20:53:08 +100062#include <pwd.h>
Damien Miller6ff3cad2006-03-15 11:52:09 +110063#include <signal.h>
Damien Millerded319c2006-09-01 15:38:36 +100064#include <stdarg.h>
Damien Miller2d00e632006-07-24 13:53:19 +100065#include <stddef.h>
Damien Millera7a73ee2006-08-05 11:37:59 +100066#include <stdio.h>
Damien Millere7a1e5c2006-08-05 11:34:19 +100067#include <stdlib.h>
Damien Millere3476ed2006-07-24 14:13:33 +100068#include <string.h>
Damien Millere6b3b612006-07-24 14:01:23 +100069#include <unistd.h>
Damien Millereba71ba2000-04-29 23:57:08 +100070
Darren Tucker46aa3e02006-09-02 15:32:40 +100071#include <netinet/in.h>
72#include <arpa/inet.h>
73
Damien Miller1f0311c2014-05-15 14:24:09 +100074#ifdef WITH_OPENSSL
Damien Millereba71ba2000-04-29 23:57:08 +100075#include <openssl/evp.h>
Damien Miller0bc1bd82000-11-13 22:57:25 +110076#include <openssl/err.h>
Damien Miller1f0311c2014-05-15 14:24:09 +100077#endif
Darren Tuckerbfaaf962008-02-28 19:13:52 +110078#include "openbsd-compat/openssl-compat.h"
Damien Millerb84886b2008-05-19 15:05:07 +100079#include "openbsd-compat/sys-queue.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100080
Damien Millerd7834352006-08-05 12:39:39 +100081#include "xmalloc.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100082#include "ssh.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000083#include "ssh1.h"
Damien Miller1383bd82000-04-06 12:32:37 +100084#include "ssh2.h"
Damien Millerb96c4412010-07-02 13:34:24 +100085#include "canohost.h"
Damien Miller1383bd82000-04-06 12:32:37 +100086#include "compat.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000087#include "cipher.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000088#include "packet.h"
89#include "buffer.h"
Ben Lindstromc7637672001-06-09 00:36:26 +000090#include "channels.h"
Damien Millereba71ba2000-04-29 23:57:08 +100091#include "key.h"
Damien Miller994cf142000-07-21 10:19:44 +100092#include "authfd.h"
Damien Millereba71ba2000-04-29 23:57:08 +100093#include "authfile.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000094#include "pathnames.h"
Damien Miller0e220db2004-06-15 10:34:08 +100095#include "dispatch.h"
Ben Lindstrombf555ba2001-01-18 02:04:35 +000096#include "clientloop.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000097#include "log.h"
98#include "readconf.h"
99#include "sshconnect.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +0000100#include "misc.h"
Ben Lindstrom06b33aa2001-02-15 03:01:59 +0000101#include "kex.h"
102#include "mac.h"
Darren Tucker06f2bd82004-05-13 16:06:46 +1000103#include "sshpty.h"
Darren Tucker46bc0752004-05-02 22:11:30 +1000104#include "match.h"
Damien Miller0e220db2004-06-15 10:34:08 +1000105#include "msg.h"
Darren Tucker25f60a72004-08-15 17:23:34 +1000106#include "uidswap.h"
Darren Tuckerf1de4e52010-01-08 16:54:59 +1100107#include "roaming.h"
Damien Millerb7576772006-07-10 20:23:39 +1000108#include "version.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000109
Damien Miller7ea845e2010-02-12 09:21:02 +1100110#ifdef ENABLE_PKCS11
111#include "ssh-pkcs11.h"
Ben Lindstrombcc18082001-08-06 21:59:25 +0000112#endif
Ben Lindstromc5b68002001-07-04 04:52:03 +0000113
Damien Miller3f905871999-11-15 17:10:57 +1100114extern char *__progname;
Damien Miller3f905871999-11-15 17:10:57 +1100115
Damien Millerea2c1a42011-06-03 12:10:22 +1000116/* Saves a copy of argv for setproctitle emulation */
117#ifndef HAVE_SETPROCTITLE
118static char **saved_av;
119#endif
120
Darren Tuckerd6173c02008-06-13 04:52:53 +1000121/* Flag indicating whether debug mode is on. May be set on the command line. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000122int debug_flag = 0;
123
Damien Miller21771e22011-05-15 08:45:50 +1000124/* Flag indicating whether a tty should be requested */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000125int tty_flag = 0;
126
Damien Miller1383bd82000-04-06 12:32:37 +1000127/* don't exec a shell */
128int no_shell_flag = 0;
Damien Miller1383bd82000-04-06 12:32:37 +1000129
Damien Miller5428f641999-11-25 11:54:57 +1100130/*
131 * Flag indicating that nothing should be read from stdin. This can be set
132 * on the command line.
133 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000134int stdin_null_flag = 0;
135
Damien Miller5428f641999-11-25 11:54:57 +1100136/*
Damien Millere11e1ea2010-08-03 16:04:46 +1000137 * Flag indicating that the current process should be backgrounded and
138 * a new slave launched in the foreground for ControlPersist.
139 */
140int need_controlpersist_detach = 0;
141
142/* Copies of flags for ControlPersist foreground slave */
Damien Miller21771e22011-05-15 08:45:50 +1000143int ostdin_null_flag, ono_shell_flag, otty_flag, orequest_tty;
Damien Millere11e1ea2010-08-03 16:04:46 +1000144
145/*
Damien Miller5428f641999-11-25 11:54:57 +1100146 * Flag indicating that ssh should fork after authentication. This is useful
Ben Lindstromf666fec2002-06-06 19:51:58 +0000147 * so that the passphrase can be entered manually, and then ssh goes to the
Damien Miller5428f641999-11-25 11:54:57 +1100148 * background.
149 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000150int fork_after_authentication_flag = 0;
151
Darren Tucker7ad8dd22010-01-12 19:40:27 +1100152/* forward stdio to remote host and port */
153char *stdio_forward_host = NULL;
154int stdio_forward_port = 0;
155
Damien Miller5428f641999-11-25 11:54:57 +1100156/*
157 * General data structure for command line options and options configurable
158 * in configuration files. See readconf.h.
159 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000160Options options;
161
Ben Lindstrom14f31ab2001-09-12 17:48:04 +0000162/* optional user configfile */
163char *config = NULL;
164
Damien Miller5428f641999-11-25 11:54:57 +1100165/*
166 * Name of the host we are connecting to. This is the name given on the
167 * command line, or the HostName specified for the user-supplied name in a
168 * configuration file.
169 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000170char *host;
171
172/* socket address the host resolves to */
Damien Miller34132e52000-01-14 15:45:46 +1100173struct sockaddr_storage hostaddr;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000174
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000175/* Private host keys. */
Ben Lindstrom1bad2562002-06-06 19:57:33 +0000176Sensitive sensitive_data;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000177
178/* Original real UID. */
179uid_t original_real_uid;
Ben Lindstromf9c48842002-06-11 16:37:51 +0000180uid_t original_effective_uid;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000181
Damien Miller1383bd82000-04-06 12:32:37 +1000182/* command to be executed */
183Buffer command;
184
Damien Miller832562e2001-01-30 09:30:01 +1100185/* Should we execute a command or invoke a subsystem? */
186int subsystem_flag = 0;
187
Damien Miller2797f7f2002-04-23 21:09:44 +1000188/* # of replies received for global requests */
Darren Tucker9f407c42008-06-13 04:50:27 +1000189static int remote_forward_confirms_received = 0;
Damien Miller2797f7f2002-04-23 21:09:44 +1000190
Damien Millerb1cbfa22008-05-19 16:00:08 +1000191/* mux.c */
192extern int muxserver_sock;
193extern u_int muxclient_command;
Damien Miller0e220db2004-06-15 10:34:08 +1000194
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000195/* Prints a help message to the user. This function never returns. */
196
Ben Lindstrombba81212001-06-25 05:01:22 +0000197static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000198usage(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000199{
Damien Miller50955102004-03-22 09:34:58 +1100200 fprintf(stderr,
Damien Millerc13c3ee2008-11-03 19:23:28 +1100201"usage: ssh [-1246AaCfgKkMNnqsTtVvXxYy] [-b bind_address] [-c cipher_spec]\n"
Damien Miller03d4d7e2013-04-23 15:21:06 +1000202" [-D [bind_address:]port] [-E log_file] [-e escape_char]\n"
203" [-F configfile] [-I pkcs11] [-i identity_file]\n"
Damien Millerd937dc02013-12-05 10:19:54 +1100204" [-L [bind_address:]port:host:hostport] [-l login_name] [-m mac_spec]\n"
Damien Millerbdb352a2013-12-05 10:20:52 +1100205" [-O ctl_cmd] [-o option] [-p port]\n"
206" [-Q cipher | cipher-auth | mac | kex | key]\n"
207" [-R [bind_address:]port:host:hostport] [-S ctl_path] [-W host:port]\n"
208" [-w local_tun[:remote_tun]] [user@]hostname [command]\n"
Damien Miller50955102004-03-22 09:34:58 +1100209 );
Darren Tuckere9a9b712005-12-20 16:15:51 +1100210 exit(255);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000211}
212
Ben Lindstrombba81212001-06-25 05:01:22 +0000213static int ssh_session(void);
214static int ssh_session2(void);
215static void load_public_identity_files(void);
Damien Miller857b02e2010-09-24 22:02:56 +1000216static void main_sigchld_handler(int);
Damien Millerb1cbfa22008-05-19 16:00:08 +1000217
218/* from muxclient.c */
219void muxclient(const char *);
220void muxserver_listen(void);
Damien Miller1383bd82000-04-06 12:32:37 +1000221
Damien Miller295ee632011-05-29 21:42:31 +1000222/* ~/ expand a list of paths. NB. assumes path[n] is heap-allocated. */
223static void
224tilde_expand_paths(char **paths, u_int num_paths)
225{
226 u_int i;
227 char *cp;
228
229 for (i = 0; i < num_paths; i++) {
230 cp = tilde_expand_filename(paths[i], original_real_uid);
Darren Tuckera627d422013-06-02 07:31:17 +1000231 free(paths[i]);
Damien Miller295ee632011-05-29 21:42:31 +1000232 paths[i] = cp;
233 }
234}
235
Damien Miller13f97b22014-02-24 15:57:55 +1100236/*
237 * Attempt to resolve a host name / port to a set of addresses and
238 * optionally return any CNAMEs encountered along the way.
239 * Returns NULL on failure.
240 * NB. this function must operate with a options having undefined members.
241 */
Damien Miller0faf7472013-10-17 11:47:23 +1100242static struct addrinfo *
Damien Miller13f97b22014-02-24 15:57:55 +1100243resolve_host(const char *name, int port, int logerr, char *cname, size_t clen)
Damien Miller0faf7472013-10-17 11:47:23 +1100244{
245 char strport[NI_MAXSERV];
246 struct addrinfo hints, *res;
247 int gaierr, loglevel = SYSLOG_LEVEL_DEBUG1;
248
Damien Miller13f97b22014-02-24 15:57:55 +1100249 if (port <= 0)
250 port = default_ssh_port();
251
Damien Miller0faf7472013-10-17 11:47:23 +1100252 snprintf(strport, sizeof strport, "%u", port);
Damien Miller1d2c4562014-02-04 11:18:20 +1100253 memset(&hints, 0, sizeof(hints));
Damien Miller13f97b22014-02-24 15:57:55 +1100254 hints.ai_family = options.address_family == -1 ?
255 AF_UNSPEC : options.address_family;
Damien Miller0faf7472013-10-17 11:47:23 +1100256 hints.ai_socktype = SOCK_STREAM;
257 if (cname != NULL)
258 hints.ai_flags = AI_CANONNAME;
259 if ((gaierr = getaddrinfo(name, strport, &hints, &res)) != 0) {
260 if (logerr || (gaierr != EAI_NONAME && gaierr != EAI_NODATA))
261 loglevel = SYSLOG_LEVEL_ERROR;
262 do_log2(loglevel, "%s: Could not resolve hostname %.100s: %s",
263 __progname, name, ssh_gai_strerror(gaierr));
264 return NULL;
265 }
266 if (cname != NULL && res->ai_canonname != NULL) {
267 if (strlcpy(cname, res->ai_canonname, clen) >= clen) {
268 error("%s: host \"%s\" cname \"%s\" too long (max %lu)",
269 __func__, name, res->ai_canonname, (u_long)clen);
270 if (clen > 0)
271 *cname = '\0';
272 }
273 }
274 return res;
275}
276
277/*
278 * Check whether the cname is a permitted replacement for the hostname
279 * and perform the replacement if it is.
Damien Miller13f97b22014-02-24 15:57:55 +1100280 * NB. this function must operate with a options having undefined members.
Damien Miller0faf7472013-10-17 11:47:23 +1100281 */
282static int
283check_follow_cname(char **namep, const char *cname)
284{
285 int i;
286 struct allowed_cname *rule;
287
288 if (*cname == '\0' || options.num_permitted_cnames == 0 ||
289 strcmp(*namep, cname) == 0)
290 return 0;
Damien Miller38505592013-10-17 11:48:13 +1100291 if (options.canonicalize_hostname == SSH_CANONICALISE_NO)
Damien Miller0faf7472013-10-17 11:47:23 +1100292 return 0;
293 /*
Damien Miller38505592013-10-17 11:48:13 +1100294 * Don't attempt to canonicalize names that will be interpreted by
Damien Miller0faf7472013-10-17 11:47:23 +1100295 * a proxy unless the user specifically requests so.
296 */
Damien Miller13f97b22014-02-24 15:57:55 +1100297 if (!option_clear_or_none(options.proxy_command) &&
Damien Miller38505592013-10-17 11:48:13 +1100298 options.canonicalize_hostname != SSH_CANONICALISE_ALWAYS)
Damien Miller0faf7472013-10-17 11:47:23 +1100299 return 0;
300 debug3("%s: check \"%s\" CNAME \"%s\"", __func__, *namep, cname);
301 for (i = 0; i < options.num_permitted_cnames; i++) {
302 rule = options.permitted_cnames + i;
303 if (match_pattern_list(*namep, rule->source_list,
304 strlen(rule->source_list), 1) != 1 ||
305 match_pattern_list(cname, rule->target_list,
306 strlen(rule->target_list), 1) != 1)
307 continue;
Damien Miller38505592013-10-17 11:48:13 +1100308 verbose("Canonicalized DNS aliased hostname "
Damien Miller0faf7472013-10-17 11:47:23 +1100309 "\"%s\" => \"%s\"", *namep, cname);
310 free(*namep);
311 *namep = xstrdup(cname);
312 return 1;
313 }
314 return 0;
315}
316
317/*
318 * Attempt to resolve the supplied hostname after applying the user's
Damien Miller51682fa2013-10-17 11:48:31 +1100319 * canonicalization rules. Returns the address list for the host or NULL
320 * if no name was found after canonicalization.
Damien Miller13f97b22014-02-24 15:57:55 +1100321 * NB. this function must operate with a options having undefined members.
Damien Miller0faf7472013-10-17 11:47:23 +1100322 */
323static struct addrinfo *
Damien Miller13f97b22014-02-24 15:57:55 +1100324resolve_canonicalize(char **hostp, int port)
Damien Miller0faf7472013-10-17 11:47:23 +1100325{
326 int i, ndots;
327 char *cp, *fullhost, cname_target[NI_MAXHOST];
328 struct addrinfo *addrs;
329
Damien Miller38505592013-10-17 11:48:13 +1100330 if (options.canonicalize_hostname == SSH_CANONICALISE_NO)
Damien Miller0faf7472013-10-17 11:47:23 +1100331 return NULL;
Damien Miller13f97b22014-02-24 15:57:55 +1100332
Damien Miller0faf7472013-10-17 11:47:23 +1100333 /*
Damien Miller38505592013-10-17 11:48:13 +1100334 * Don't attempt to canonicalize names that will be interpreted by
Damien Miller0faf7472013-10-17 11:47:23 +1100335 * a proxy unless the user specifically requests so.
336 */
Damien Miller13f97b22014-02-24 15:57:55 +1100337 if (!option_clear_or_none(options.proxy_command) &&
Damien Miller38505592013-10-17 11:48:13 +1100338 options.canonicalize_hostname != SSH_CANONICALISE_ALWAYS)
Damien Miller0faf7472013-10-17 11:47:23 +1100339 return NULL;
Damien Miller13f97b22014-02-24 15:57:55 +1100340
Damien Miller51682fa2013-10-17 11:48:31 +1100341 /* Don't apply canonicalization to sufficiently-qualified hostnames */
Damien Miller0faf7472013-10-17 11:47:23 +1100342 ndots = 0;
343 for (cp = *hostp; *cp != '\0'; cp++) {
344 if (*cp == '.')
345 ndots++;
346 }
Damien Miller38505592013-10-17 11:48:13 +1100347 if (ndots > options.canonicalize_max_dots) {
348 debug3("%s: not canonicalizing hostname \"%s\" (max dots %d)",
349 __func__, *hostp, options.canonicalize_max_dots);
Damien Miller0faf7472013-10-17 11:47:23 +1100350 return NULL;
351 }
352 /* Attempt each supplied suffix */
353 for (i = 0; i < options.num_canonical_domains; i++) {
354 *cname_target = '\0';
355 xasprintf(&fullhost, "%s.%s.", *hostp,
356 options.canonical_domains[i]);
Damien Miller13f97b22014-02-24 15:57:55 +1100357 debug3("%s: attempting \"%s\" => \"%s\"", __func__,
358 *hostp, fullhost);
359 if ((addrs = resolve_host(fullhost, port, 0,
Damien Miller0faf7472013-10-17 11:47:23 +1100360 cname_target, sizeof(cname_target))) == NULL) {
361 free(fullhost);
362 continue;
363 }
364 /* Remove trailing '.' */
365 fullhost[strlen(fullhost) - 1] = '\0';
366 /* Follow CNAME if requested */
367 if (!check_follow_cname(&fullhost, cname_target)) {
Damien Miller38505592013-10-17 11:48:13 +1100368 debug("Canonicalized hostname \"%s\" => \"%s\"",
Damien Miller0faf7472013-10-17 11:47:23 +1100369 *hostp, fullhost);
370 }
371 free(*hostp);
372 *hostp = fullhost;
373 return addrs;
374 }
Damien Miller38505592013-10-17 11:48:13 +1100375 if (!options.canonicalize_fallback_local)
Damien Miller13f97b22014-02-24 15:57:55 +1100376 fatal("%s: Could not resolve host \"%s\"", __progname, *hostp);
377 debug2("%s: host %s not found in any suffix", __func__, *hostp);
Damien Miller0faf7472013-10-17 11:47:23 +1100378 return NULL;
379}
380
Damien Miller95def091999-11-25 00:26:21 +1100381/*
Damien Miller13f97b22014-02-24 15:57:55 +1100382 * Read per-user configuration file. Ignore the system wide config
383 * file if the user specifies a config file on the command line.
384 */
385static void
386process_config_files(struct passwd *pw)
387{
388 char buf[MAXPATHLEN];
389 int r;
390
391 if (config != NULL) {
392 if (strcasecmp(config, "none") != 0 &&
393 !read_config_file(config, pw, host, &options,
394 SSHCONF_USERCONF))
395 fatal("Can't open user config file %.100s: "
396 "%.100s", config, strerror(errno));
397 } else {
398 r = snprintf(buf, sizeof buf, "%s/%s", pw->pw_dir,
399 _PATH_SSH_USER_CONFFILE);
400 if (r > 0 && (size_t)r < sizeof(buf))
401 (void)read_config_file(buf, pw, host, &options,
402 SSHCONF_CHECKPERM|SSHCONF_USERCONF);
403
404 /* Read systemwide configuration file after user config. */
405 (void)read_config_file(_PATH_HOST_CONFIG_FILE, pw, host,
406 &options, 0);
407 }
408}
409
410/*
Damien Miller95def091999-11-25 00:26:21 +1100411 * Main program for the ssh client.
412 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000413int
414main(int ac, char **av)
415{
Darren Tucker199b1342009-07-06 07:16:56 +1000416 int i, r, opt, exit_status, use_syslog;
Damien Miller03d4d7e2013-04-23 15:21:06 +1000417 char *p, *cp, *line, *argv0, buf[MAXPATHLEN], *host_arg, *logfile;
Damien Millerdfc85fa2011-05-15 08:44:02 +1000418 char thishost[NI_MAXHOST], shorthost[NI_MAXHOST], portstr[NI_MAXSERV];
Damien Miller0faf7472013-10-17 11:47:23 +1100419 char cname[NI_MAXHOST];
Damien Miller95def091999-11-25 00:26:21 +1100420 struct stat st;
Ben Lindstrom086cf212001-03-05 05:56:40 +0000421 struct passwd *pw;
Damien Miller194fd902013-10-15 12:13:05 +1100422 int timeout_ms;
Ben Lindstrom5ccf63a2001-09-24 20:00:10 +0000423 extern int optind, optreset;
Damien Miller4f8e6692001-07-14 13:22:53 +1000424 extern char *optarg;
Damien Millerf91ee4c2005-03-01 21:24:33 +1100425 Forward fwd;
Damien Miller0faf7472013-10-17 11:47:23 +1100426 struct addrinfo *addrs = NULL;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000427
Darren Tuckerce321d82005-10-03 18:11:24 +1000428 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
429 sanitise_stdfd();
430
Damien Miller59d3d5b2003-08-22 09:34:41 +1000431 __progname = ssh_get_progname(av[0]);
Damien Millerf9b625c2000-07-09 22:42:32 +1000432
Damien Millerea2c1a42011-06-03 12:10:22 +1000433#ifndef HAVE_SETPROCTITLE
434 /* Prepare for later setproctitle emulation */
435 /* Save argv so it isn't clobbered by setproctitle() emulation */
436 saved_av = xcalloc(ac + 1, sizeof(*saved_av));
437 for (i = 0; i < ac; i++)
438 saved_av[i] = xstrdup(av[i]);
439 saved_av[i] = NULL;
440 compat_init_setproctitle(ac, av);
441 av = saved_av;
442#endif
443
Damien Miller5428f641999-11-25 11:54:57 +1100444 /*
Damien Miller00d9ae22010-08-17 01:59:31 +1000445 * Discard other fds that are hanging around. These can cause problem
446 * with backgrounded ssh processes started by ControlPersist.
447 */
448 closefrom(STDERR_FILENO + 1);
449
450 /*
Damien Miller5428f641999-11-25 11:54:57 +1100451 * Save the original real uid. It will be needed later (uid-swapping
452 * may clobber the real uid).
453 */
Damien Miller95def091999-11-25 00:26:21 +1100454 original_real_uid = getuid();
455 original_effective_uid = geteuid();
Damien Millera8e06ce2003-11-21 23:48:55 +1100456
Damien Miller50b9a602002-09-04 16:50:06 +1000457 /*
458 * Use uid-swapping to give up root privileges for the duration of
459 * option processing. We will re-instantiate the rights when we are
460 * ready to create the privileged port, and will permanently drop
461 * them when the port has been created (actually, when the connection
462 * has been made, as we may need to create the port several times).
463 */
464 PRIV_END;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000465
Damien Miller05dd7952000-10-01 00:42:48 +1100466#ifdef HAVE_SETRLIMIT
Damien Miller95def091999-11-25 00:26:21 +1100467 /* If we are installed setuid root be careful to not drop core. */
468 if (original_real_uid != original_effective_uid) {
469 struct rlimit rlim;
470 rlim.rlim_cur = rlim.rlim_max = 0;
471 if (setrlimit(RLIMIT_CORE, &rlim) < 0)
472 fatal("setrlimit failed: %.100s", strerror(errno));
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000473 }
Damien Millerbac2d8a2000-09-05 16:13:06 +1100474#endif
Ben Lindstrom3fcf1a22001-04-08 18:26:59 +0000475 /* Get user data. */
476 pw = getpwuid(original_real_uid);
477 if (!pw) {
Damien Miller3009d3c2013-07-20 13:22:31 +1000478 logit("No user exists for uid %lu", (u_long)original_real_uid);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100479 exit(255);
Ben Lindstrom3fcf1a22001-04-08 18:26:59 +0000480 }
481 /* Take a copy of the returned structure. */
482 pw = pwcopy(pw);
483
Damien Miller5428f641999-11-25 11:54:57 +1100484 /*
Damien Miller5428f641999-11-25 11:54:57 +1100485 * Set our umask to something reasonable, as some files are created
486 * with the default umask. This will make them world-readable but
487 * writable only by the owner, which is ok for all files for which we
488 * don't set the modes explicitly.
489 */
Damien Miller95def091999-11-25 00:26:21 +1100490 umask(022);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000491
Darren Tuckerd6173c02008-06-13 04:52:53 +1000492 /*
493 * Initialize option structure to indicate that no values have been
494 * set.
495 */
Damien Miller95def091999-11-25 00:26:21 +1100496 initialize_options(&options);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000497
Damien Miller95def091999-11-25 00:26:21 +1100498 /* Parse command-line arguments. */
499 host = NULL;
Damien Millere272a5b2008-11-03 19:22:37 +1100500 use_syslog = 0;
Damien Miller03d4d7e2013-04-23 15:21:06 +1000501 logfile = NULL;
Darren Tucker72efd742009-06-21 17:48:00 +1000502 argv0 = av[0];
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000503
Damien Miller2ecb6bd2006-03-15 12:03:53 +1100504 again:
Darren Tuckerd6173c02008-06-13 04:52:53 +1000505 while ((opt = getopt(ac, av, "1246ab:c:e:fgi:kl:m:no:p:qstvx"
Damien Millerea111192013-04-23 19:24:32 +1000506 "ACD:E:F:I:KL:MNO:PQ:R:S:TVw:W:XYy")) != -1) {
Damien Miller95def091999-11-25 00:26:21 +1100507 switch (opt) {
Ben Lindstrom1e7d3062001-02-09 02:36:43 +0000508 case '1':
509 options.protocol = SSH_PROTO_1;
510 break;
Damien Miller4af51302000-04-16 11:18:38 +1000511 case '2':
512 options.protocol = SSH_PROTO_2;
513 break;
Damien Miller34132e52000-01-14 15:45:46 +1100514 case '4':
Darren Tucker0a4f04b2003-07-03 20:37:47 +1000515 options.address_family = AF_INET;
Damien Miller34132e52000-01-14 15:45:46 +1100516 break;
Damien Miller34132e52000-01-14 15:45:46 +1100517 case '6':
Darren Tucker0a4f04b2003-07-03 20:37:47 +1000518 options.address_family = AF_INET6;
Damien Miller34132e52000-01-14 15:45:46 +1100519 break;
Damien Miller95def091999-11-25 00:26:21 +1100520 case 'n':
521 stdin_null_flag = 1;
522 break;
Damien Miller95def091999-11-25 00:26:21 +1100523 case 'f':
524 fork_after_authentication_flag = 1;
525 stdin_null_flag = 1;
526 break;
Damien Miller95def091999-11-25 00:26:21 +1100527 case 'x':
528 options.forward_x11 = 0;
529 break;
Damien Miller95def091999-11-25 00:26:21 +1100530 case 'X':
531 options.forward_x11 = 1;
532 break;
Damien Millere272a5b2008-11-03 19:22:37 +1100533 case 'y':
534 use_syslog = 1;
535 break;
Damien Miller03d4d7e2013-04-23 15:21:06 +1000536 case 'E':
537 logfile = xstrdup(optarg);
538 break;
Darren Tucker0a118da2003-10-15 15:54:32 +1000539 case 'Y':
540 options.forward_x11 = 1;
541 options.forward_x11_trusted = 1;
542 break;
Damien Miller95def091999-11-25 00:26:21 +1100543 case 'g':
544 options.gateway_ports = 1;
545 break;
Darren Tucker7ebfc102004-11-07 20:06:19 +1100546 case 'O':
Damien Millere1537f92010-01-26 13:26:22 +1100547 if (stdio_forward_host != NULL)
548 fatal("Cannot specify multiplexing "
549 "command with -W");
550 else if (muxclient_command != 0)
551 fatal("Multiplexing command already specified");
Darren Tucker7ebfc102004-11-07 20:06:19 +1100552 if (strcmp(optarg, "check") == 0)
Damien Millerb1cbfa22008-05-19 16:00:08 +1000553 muxclient_command = SSHMUX_COMMAND_ALIVE_CHECK;
Damien Miller388f6fc2010-05-21 14:57:35 +1000554 else if (strcmp(optarg, "forward") == 0)
555 muxclient_command = SSHMUX_COMMAND_FORWARD;
Darren Tucker7ebfc102004-11-07 20:06:19 +1100556 else if (strcmp(optarg, "exit") == 0)
Damien Millerb1cbfa22008-05-19 16:00:08 +1000557 muxclient_command = SSHMUX_COMMAND_TERMINATE;
Damien Miller6c3eec72011-05-05 14:16:22 +1000558 else if (strcmp(optarg, "stop") == 0)
559 muxclient_command = SSHMUX_COMMAND_STOP;
Damien Millerf6dff7c2011-09-22 21:38:52 +1000560 else if (strcmp(optarg, "cancel") == 0)
561 muxclient_command = SSHMUX_COMMAND_CANCEL_FWD;
Darren Tucker7ebfc102004-11-07 20:06:19 +1100562 else
563 fatal("Invalid multiplex command.");
564 break;
Damien Miller147bba32002-09-04 16:46:06 +1000565 case 'P': /* deprecated */
Damien Miller95def091999-11-25 00:26:21 +1100566 options.use_privileged_port = 0;
567 break;
Damien Millerd937dc02013-12-05 10:19:54 +1100568 case 'Q':
Damien Millerea111192013-04-23 19:24:32 +1000569 cp = NULL;
Damien Millerd937dc02013-12-05 10:19:54 +1100570 if (strcmp(optarg, "cipher") == 0)
Damien Miller0fde8ac2013-11-21 14:12:23 +1100571 cp = cipher_alg_list('\n', 0);
Damien Millerd937dc02013-12-05 10:19:54 +1100572 else if (strcmp(optarg, "cipher-auth") == 0)
Damien Miller0fde8ac2013-11-21 14:12:23 +1100573 cp = cipher_alg_list('\n', 1);
Damien Millerd937dc02013-12-05 10:19:54 +1100574 else if (strcmp(optarg, "mac") == 0)
Damien Miller690d9892013-11-08 12:16:49 +1100575 cp = mac_alg_list('\n');
Damien Millerd937dc02013-12-05 10:19:54 +1100576 else if (strcmp(optarg, "kex") == 0)
Damien Miller690d9892013-11-08 12:16:49 +1100577 cp = kex_alg_list('\n');
Damien Millerd937dc02013-12-05 10:19:54 +1100578 else if (strcmp(optarg, "key") == 0)
Damien Miller5be9d9e2013-12-07 11:24:01 +1100579 cp = key_alg_list(0, 0);
580 else if (strcmp(optarg, "key-cert") == 0)
581 cp = key_alg_list(1, 0);
582 else if (strcmp(optarg, "key-plain") == 0)
583 cp = key_alg_list(0, 1);
Damien Millerea111192013-04-23 19:24:32 +1000584 if (cp == NULL)
585 fatal("Unsupported query \"%s\"", optarg);
586 printf("%s\n", cp);
587 free(cp);
588 exit(0);
589 break;
Damien Miller95def091999-11-25 00:26:21 +1100590 case 'a':
591 options.forward_agent = 0;
592 break;
Damien Millerb1715dc2000-05-30 13:44:51 +1000593 case 'A':
594 options.forward_agent = 1;
595 break;
Damien Miller95def091999-11-25 00:26:21 +1100596 case 'k':
Damien Millere0113cc2003-11-24 13:10:09 +1100597 options.gss_deleg_creds = 0;
Damien Miller95def091999-11-25 00:26:21 +1100598 break;
Darren Tucker415bddc2007-06-12 23:43:16 +1000599 case 'K':
600 options.gss_authentication = 1;
601 options.gss_deleg_creds = 1;
602 break;
Damien Miller95def091999-11-25 00:26:21 +1100603 case 'i':
604 if (stat(optarg, &st) < 0) {
Damien Millerf4614452001-07-14 12:18:10 +1000605 fprintf(stderr, "Warning: Identity file %s "
Damien Miller3eb48b62005-03-01 21:15:46 +1100606 "not accessible: %s.\n", optarg,
607 strerror(errno));
Damien Miller95def091999-11-25 00:26:21 +1100608 break;
609 }
Darren Tucker19104782013-04-05 11:13:08 +1100610 add_identity_file(&options, NULL, optarg, 1);
Damien Miller95def091999-11-25 00:26:21 +1100611 break;
Ben Lindstromc5b68002001-07-04 04:52:03 +0000612 case 'I':
Damien Miller7ea845e2010-02-12 09:21:02 +1100613#ifdef ENABLE_PKCS11
614 options.pkcs11_provider = xstrdup(optarg);
Ben Lindstrombcc18082001-08-06 21:59:25 +0000615#else
Damien Miller7ea845e2010-02-12 09:21:02 +1100616 fprintf(stderr, "no support for PKCS#11.\n");
Ben Lindstrombcc18082001-08-06 21:59:25 +0000617#endif
Ben Lindstromc5b68002001-07-04 04:52:03 +0000618 break;
Damien Miller95def091999-11-25 00:26:21 +1100619 case 't':
Damien Miller21771e22011-05-15 08:45:50 +1000620 if (options.request_tty == REQUEST_TTY_YES)
621 options.request_tty = REQUEST_TTY_FORCE;
622 else
623 options.request_tty = REQUEST_TTY_YES;
Damien Miller95def091999-11-25 00:26:21 +1100624 break;
Damien Miller95def091999-11-25 00:26:21 +1100625 case 'v':
Darren Tuckere98dfa32003-07-19 19:54:31 +1000626 if (debug_flag == 0) {
Damien Millere4340be2000-09-16 13:29:08 +1100627 debug_flag = 1;
628 options.log_level = SYSLOG_LEVEL_DEBUG1;
Darren Tuckere98dfa32003-07-19 19:54:31 +1000629 } else {
630 if (options.log_level < SYSLOG_LEVEL_DEBUG3)
631 options.log_level++;
Darren Tuckere98dfa32003-07-19 19:54:31 +1000632 }
Damien Miller03d4d7e2013-04-23 15:21:06 +1000633 break;
Damien Miller95def091999-11-25 00:26:21 +1100634 case 'V':
Damien Miller0c889cd2004-03-22 09:36:00 +1100635 fprintf(stderr, "%s, %s\n",
Damien Miller1f0311c2014-05-15 14:24:09 +1000636 SSH_RELEASE,
637#ifdef WITH_OPENSSL
638 SSLeay_version(SSLEAY_VERSION)
639#else
640 "without OpenSSL"
641#endif
642 );
Damien Miller95def091999-11-25 00:26:21 +1100643 if (opt == 'V')
644 exit(0);
Damien Miller95def091999-11-25 00:26:21 +1100645 break;
Damien Millerd27b9472005-12-13 19:29:02 +1100646 case 'w':
Damien Miller7b58e802005-12-13 19:33:19 +1100647 if (options.tun_open == -1)
648 options.tun_open = SSH_TUNMODE_DEFAULT;
Damien Millerd27b9472005-12-13 19:29:02 +1100649 options.tun_local = a2tun(optarg, &options.tun_remote);
Damien Miller7b58e802005-12-13 19:33:19 +1100650 if (options.tun_local == SSH_TUNID_ERR) {
Darren Tuckerd6173c02008-06-13 04:52:53 +1000651 fprintf(stderr,
652 "Bad tun device '%s'\n", optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100653 exit(255);
Damien Millerd27b9472005-12-13 19:29:02 +1100654 }
655 break;
Darren Tucker7ad8dd22010-01-12 19:40:27 +1100656 case 'W':
Damien Millere1537f92010-01-26 13:26:22 +1100657 if (stdio_forward_host != NULL)
658 fatal("stdio forward already specified");
659 if (muxclient_command != 0)
660 fatal("Cannot specify stdio forward with -O");
Darren Tucker7ad8dd22010-01-12 19:40:27 +1100661 if (parse_forward(&fwd, optarg, 1, 0)) {
662 stdio_forward_host = fwd.listen_host;
663 stdio_forward_port = fwd.listen_port;
Darren Tuckera627d422013-06-02 07:31:17 +1000664 free(fwd.connect_host);
Darren Tucker7ad8dd22010-01-12 19:40:27 +1100665 } else {
666 fprintf(stderr,
667 "Bad stdio forwarding specification '%s'\n",
668 optarg);
669 exit(255);
670 }
Damien Miller21771e22011-05-15 08:45:50 +1000671 options.request_tty = REQUEST_TTY_NO;
Darren Tucker7ad8dd22010-01-12 19:40:27 +1100672 no_shell_flag = 1;
673 options.clear_forwardings = 1;
674 options.exit_on_forward_failure = 1;
675 break;
Damien Miller95def091999-11-25 00:26:21 +1100676 case 'q':
677 options.log_level = SYSLOG_LEVEL_QUIET;
678 break;
Damien Miller95def091999-11-25 00:26:21 +1100679 case 'e':
680 if (optarg[0] == '^' && optarg[2] == 0 &&
Damien Millerf4614452001-07-14 12:18:10 +1000681 (u_char) optarg[1] >= 64 &&
682 (u_char) optarg[1] < 128)
Ben Lindstrom46c16222000-12-22 01:43:59 +0000683 options.escape_char = (u_char) optarg[1] & 31;
Damien Miller95def091999-11-25 00:26:21 +1100684 else if (strlen(optarg) == 1)
Ben Lindstrom46c16222000-12-22 01:43:59 +0000685 options.escape_char = (u_char) optarg[0];
Damien Miller95def091999-11-25 00:26:21 +1100686 else if (strcmp(optarg, "none") == 0)
Ben Lindstrom2b1f71b2001-06-05 20:32:21 +0000687 options.escape_char = SSH_ESCAPECHAR_NONE;
Damien Miller95def091999-11-25 00:26:21 +1100688 else {
Damien Millerf4614452001-07-14 12:18:10 +1000689 fprintf(stderr, "Bad escape character '%s'.\n",
690 optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100691 exit(255);
Damien Miller95def091999-11-25 00:26:21 +1100692 }
693 break;
Damien Miller95def091999-11-25 00:26:21 +1100694 case 'c':
Damien Millereba71ba2000-04-29 23:57:08 +1000695 if (ciphers_valid(optarg)) {
696 /* SSH2 only */
697 options.ciphers = xstrdup(optarg);
Darren Tucker5cb30ad2004-08-12 22:40:24 +1000698 options.cipher = SSH_CIPHER_INVALID;
Damien Millereba71ba2000-04-29 23:57:08 +1000699 } else {
700 /* SSH1 only */
Damien Millere39cacc2000-11-29 12:18:44 +1100701 options.cipher = cipher_number(optarg);
702 if (options.cipher == -1) {
Damien Millerf4614452001-07-14 12:18:10 +1000703 fprintf(stderr,
704 "Unknown cipher type '%s'\n",
705 optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100706 exit(255);
Damien Millereba71ba2000-04-29 23:57:08 +1000707 }
Damien Millerf4614452001-07-14 12:18:10 +1000708 if (options.cipher == SSH_CIPHER_3DES)
Damien Millere39cacc2000-11-29 12:18:44 +1100709 options.ciphers = "3des-cbc";
Damien Millerf4614452001-07-14 12:18:10 +1000710 else if (options.cipher == SSH_CIPHER_BLOWFISH)
Damien Millere39cacc2000-11-29 12:18:44 +1100711 options.ciphers = "blowfish-cbc";
Damien Millerf4614452001-07-14 12:18:10 +1000712 else
Damien Millere39cacc2000-11-29 12:18:44 +1100713 options.ciphers = (char *)-1;
Damien Miller95def091999-11-25 00:26:21 +1100714 }
715 break;
Ben Lindstrom06b33aa2001-02-15 03:01:59 +0000716 case 'm':
717 if (mac_valid(optarg))
718 options.macs = xstrdup(optarg);
719 else {
Damien Millerf4614452001-07-14 12:18:10 +1000720 fprintf(stderr, "Unknown mac type '%s'\n",
721 optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100722 exit(255);
Ben Lindstrom06b33aa2001-02-15 03:01:59 +0000723 }
724 break;
Damien Miller0e220db2004-06-15 10:34:08 +1000725 case 'M':
Damien Millerd14b1e72005-06-16 13:19:41 +1000726 if (options.control_master == SSHCTL_MASTER_YES)
727 options.control_master = SSHCTL_MASTER_ASK;
728 else
729 options.control_master = SSHCTL_MASTER_YES;
Damien Miller0e220db2004-06-15 10:34:08 +1000730 break;
Damien Miller95def091999-11-25 00:26:21 +1100731 case 'p':
Ben Lindstrom19066a12001-04-12 23:39:26 +0000732 options.port = a2port(optarg);
Damien Miller3dc71ad2009-01-28 16:31:22 +1100733 if (options.port <= 0) {
Ben Lindstrom146edb92001-04-11 23:06:28 +0000734 fprintf(stderr, "Bad port '%s'\n", optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100735 exit(255);
Ben Lindstrom146edb92001-04-11 23:06:28 +0000736 }
Damien Miller95def091999-11-25 00:26:21 +1100737 break;
Damien Miller95def091999-11-25 00:26:21 +1100738 case 'l':
739 options.user = optarg;
740 break;
Ben Lindstrom1a174712001-09-12 17:56:15 +0000741
Damien Miller95def091999-11-25 00:26:21 +1100742 case 'L':
Damien Miller4bf648f2009-02-14 16:28:21 +1100743 if (parse_forward(&fwd, optarg, 0, 0))
Damien Millerf91ee4c2005-03-01 21:24:33 +1100744 add_local_forward(&options, &fwd);
745 else {
Damien Millerf4614452001-07-14 12:18:10 +1000746 fprintf(stderr,
Damien Millerf91ee4c2005-03-01 21:24:33 +1100747 "Bad local forwarding specification '%s'\n",
Damien Millerf4614452001-07-14 12:18:10 +1000748 optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100749 exit(255);
Ben Lindstrom1a174712001-09-12 17:56:15 +0000750 }
Damien Millerf91ee4c2005-03-01 21:24:33 +1100751 break;
752
753 case 'R':
Damien Miller4bf648f2009-02-14 16:28:21 +1100754 if (parse_forward(&fwd, optarg, 0, 1)) {
Damien Millerf91ee4c2005-03-01 21:24:33 +1100755 add_remote_forward(&options, &fwd);
756 } else {
757 fprintf(stderr,
758 "Bad remote forwarding specification "
759 "'%s'\n", optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100760 exit(255);
Damien Millerf91ee4c2005-03-01 21:24:33 +1100761 }
Damien Miller95def091999-11-25 00:26:21 +1100762 break;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000763
764 case 'D':
Damien Miller4bf648f2009-02-14 16:28:21 +1100765 if (parse_forward(&fwd, optarg, 1, 0)) {
Damien Millera699d952008-11-03 19:27:34 +1100766 add_local_forward(&options, &fwd);
Damien Millerf91ee4c2005-03-01 21:24:33 +1100767 } else {
Damien Millera699d952008-11-03 19:27:34 +1100768 fprintf(stderr,
769 "Bad dynamic forwarding specification "
770 "'%s'\n", optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100771 exit(255);
Ben Lindstrom146edb92001-04-11 23:06:28 +0000772 }
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000773 break;
774
Damien Miller95def091999-11-25 00:26:21 +1100775 case 'C':
776 options.compression = 1;
777 break;
Damien Miller1383bd82000-04-06 12:32:37 +1000778 case 'N':
779 no_shell_flag = 1;
Damien Miller21771e22011-05-15 08:45:50 +1000780 options.request_tty = REQUEST_TTY_NO;
Damien Miller1383bd82000-04-06 12:32:37 +1000781 break;
Damien Miller1383bd82000-04-06 12:32:37 +1000782 case 'T':
Damien Miller21771e22011-05-15 08:45:50 +1000783 options.request_tty = REQUEST_TTY_NO;
Damien Miller1383bd82000-04-06 12:32:37 +1000784 break;
Damien Miller95def091999-11-25 00:26:21 +1100785 case 'o':
Damien Miller9836cf82003-12-17 16:30:06 +1100786 line = xstrdup(optarg);
Damien Miller194fd902013-10-15 12:13:05 +1100787 if (process_config_line(&options, pw, host ? host : "",
788 line, "command-line", 0, NULL, SSHCONF_USERCONF)
Darren Tuckeraefa3682013-04-05 11:18:35 +1100789 != 0)
Darren Tuckere9a9b712005-12-20 16:15:51 +1100790 exit(255);
Darren Tuckera627d422013-06-02 07:31:17 +1000791 free(line);
Damien Miller95def091999-11-25 00:26:21 +1100792 break;
Damien Miller832562e2001-01-30 09:30:01 +1100793 case 's':
794 subsystem_flag = 1;
795 break;
Damien Miller0e220db2004-06-15 10:34:08 +1000796 case 'S':
797 if (options.control_path != NULL)
798 free(options.control_path);
799 options.control_path = xstrdup(optarg);
Damien Miller0e220db2004-06-15 10:34:08 +1000800 break;
Ben Lindstrome0f88042001-04-30 13:06:24 +0000801 case 'b':
802 options.bind_address = optarg;
803 break;
Ben Lindstrom14f31ab2001-09-12 17:48:04 +0000804 case 'F':
805 config = optarg;
806 break;
Damien Miller95def091999-11-25 00:26:21 +1100807 default:
808 usage();
809 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000810 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000811
Damien Millerf4614452001-07-14 12:18:10 +1000812 ac -= optind;
813 av += optind;
814
Darren Tuckerb8c884a2010-01-08 18:53:43 +1100815 if (ac > 0 && !host) {
Ben Lindstromc276c122002-12-23 02:14:51 +0000816 if (strrchr(*av, '@')) {
Damien Millerf4614452001-07-14 12:18:10 +1000817 p = xstrdup(*av);
Ben Lindstromc276c122002-12-23 02:14:51 +0000818 cp = strrchr(p, '@');
Damien Millerf4614452001-07-14 12:18:10 +1000819 if (cp == NULL || cp == p)
820 usage();
821 options.user = p;
822 *cp = '\0';
Damien Miller0faf7472013-10-17 11:47:23 +1100823 host = xstrdup(++cp);
Damien Millerf4614452001-07-14 12:18:10 +1000824 } else
Damien Miller0faf7472013-10-17 11:47:23 +1100825 host = xstrdup(*av);
Ben Lindstromb9fa6912002-12-23 02:24:54 +0000826 if (ac > 1) {
827 optind = optreset = 1;
Damien Millerf4614452001-07-14 12:18:10 +1000828 goto again;
829 }
Ben Lindstromb9fa6912002-12-23 02:24:54 +0000830 ac--, av++;
Damien Millerf4614452001-07-14 12:18:10 +1000831 }
832
Damien Miller95def091999-11-25 00:26:21 +1100833 /* Check that we got a host name. */
834 if (!host)
835 usage();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000836
Damien Miller0faf7472013-10-17 11:47:23 +1100837 host_arg = xstrdup(host);
838
Damien Miller1f0311c2014-05-15 14:24:09 +1000839#ifdef WITH_OPENSSL
Damien Miller4314c2b2010-09-10 11:12:09 +1000840 OpenSSL_add_all_algorithms();
Damien Miller0bc1bd82000-11-13 22:57:25 +1100841 ERR_load_crypto_strings();
Damien Miller1f0311c2014-05-15 14:24:09 +1000842#endif
Damien Millercb5e44a2000-09-29 12:12:36 +1100843
Damien Miller95def091999-11-25 00:26:21 +1100844 /* Initialize the command to execute on remote host. */
845 buffer_init(&command);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000846
Damien Miller5428f641999-11-25 11:54:57 +1100847 /*
848 * Save the command to execute on the remote host in a buffer. There
849 * is no limit on the length of the command, except by the maximum
850 * packet size. Also sets the tty flag if there is no command.
851 */
Damien Millerf4614452001-07-14 12:18:10 +1000852 if (!ac) {
Damien Miller95def091999-11-25 00:26:21 +1100853 /* No command specified - execute shell on a tty. */
Damien Miller832562e2001-01-30 09:30:01 +1100854 if (subsystem_flag) {
Damien Millerf4614452001-07-14 12:18:10 +1000855 fprintf(stderr,
856 "You must specify a subsystem to invoke.\n");
Damien Miller832562e2001-01-30 09:30:01 +1100857 usage();
858 }
Damien Miller95def091999-11-25 00:26:21 +1100859 } else {
Damien Millerf4614452001-07-14 12:18:10 +1000860 /* A command has been specified. Store it into the buffer. */
861 for (i = 0; i < ac; i++) {
862 if (i)
Damien Miller95def091999-11-25 00:26:21 +1100863 buffer_append(&command, " ", 1);
864 buffer_append(&command, av[i], strlen(av[i]));
865 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000866 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000867
Damien Miller95def091999-11-25 00:26:21 +1100868 /* Cannot fork to background if no command. */
Darren Tuckerd6173c02008-06-13 04:52:53 +1000869 if (fork_after_authentication_flag && buffer_len(&command) == 0 &&
870 !no_shell_flag)
871 fatal("Cannot fork into background without a command "
872 "to execute.");
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000873
Ben Lindstrom8a432f52001-03-05 07:24:46 +0000874 /*
875 * Initialize "log" output. Since we are the client all output
Damien Miller03d4d7e2013-04-23 15:21:06 +1000876 * goes to stderr unless otherwise specified by -y or -E.
Ben Lindstrom8a432f52001-03-05 07:24:46 +0000877 */
Damien Miller03d4d7e2013-04-23 15:21:06 +1000878 if (use_syslog && logfile != NULL)
879 fatal("Can't specify both -y and -E");
880 if (logfile != NULL) {
881 log_redirect_stderr_to(logfile);
Darren Tuckera627d422013-06-02 07:31:17 +1000882 free(logfile);
Damien Miller03d4d7e2013-04-23 15:21:06 +1000883 }
Darren Tucker72efd742009-06-21 17:48:00 +1000884 log_init(argv0,
Darren Tuckerd6173c02008-06-13 04:52:53 +1000885 options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level,
Damien Millere272a5b2008-11-03 19:22:37 +1100886 SYSLOG_FACILITY_USER, !use_syslog);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000887
Damien Miller03d4d7e2013-04-23 15:21:06 +1000888 if (debug_flag)
Damien Miller1f0311c2014-05-15 14:24:09 +1000889 logit("%s, %s", SSH_RELEASE,
890#ifdef WITH_OPENSSL
891 SSLeay_version(SSLEAY_VERSION)
892#else
893 "without OpenSSL"
894#endif
895 );
Damien Miller03d4d7e2013-04-23 15:21:06 +1000896
Damien Miller13f97b22014-02-24 15:57:55 +1100897 /* Parse the configuration files */
898 process_config_files(pw);
Ben Lindstrom83f07d12001-10-03 17:22:29 +0000899
Damien Miller13f97b22014-02-24 15:57:55 +1100900 /* Hostname canonicalisation needs a few options filled. */
901 fill_default_options_for_canonicalization(&options);
902
903 /* If the user has replaced the hostname then take it into use now */
904 if (options.hostname != NULL) {
905 /* NB. Please keep in sync with readconf.c:match_cfg_line() */
906 cp = percent_expand(options.hostname,
907 "h", host, (char *)NULL);
908 free(host);
909 host = cp;
910 }
911
912 /* If canonicalization requested then try to apply it */
913 lowercase(host);
914 if (options.canonicalize_hostname != SSH_CANONICALISE_NO)
915 addrs = resolve_canonicalize(&host, options.port);
916
917 /*
Damien Miller08b57c62014-02-27 10:17:13 +1100918 * If CanonicalizePermittedCNAMEs have been specified but
919 * other canonicalization did not happen (by not being requested
920 * or by failing with fallback) then the hostname may still be changed
921 * as a result of CNAME following.
922 *
923 * Try to resolve the bare hostname name using the system resolver's
924 * usual search rules and then apply the CNAME follow rules.
925 *
926 * Skip the lookup if a ProxyCommand is being used unless the user
927 * has specifically requested canonicalisation for this case via
928 * CanonicalizeHostname=always
Damien Miller13f97b22014-02-24 15:57:55 +1100929 */
Damien Miller08b57c62014-02-27 10:17:13 +1100930 if (addrs == NULL && options.num_permitted_cnames != 0 &&
931 (option_clear_or_none(options.proxy_command) ||
Damien Miller13f97b22014-02-24 15:57:55 +1100932 options.canonicalize_hostname == SSH_CANONICALISE_ALWAYS)) {
Damien Miller19439e92014-07-02 15:28:40 +1000933 if ((addrs = resolve_host(host, options.port,
934 option_clear_or_none(options.proxy_command),
935 cname, sizeof(cname))) == NULL) {
936 /* Don't fatal proxied host names not in the DNS */
937 if (option_clear_or_none(options.proxy_command))
938 cleanup_exit(255); /* logged in resolve_host */
939 } else
940 check_follow_cname(&host, cname);
Damien Miller13f97b22014-02-24 15:57:55 +1100941 }
942
943 /*
944 * If the target hostname has changed as a result of canonicalisation
945 * then re-parse the configuration files as new stanzas may match.
946 */
947 if (strcasecmp(host_arg, host) != 0) {
948 debug("Hostname has changed; re-reading configuration");
949 process_config_files(pw);
Ben Lindstrom14f31ab2001-09-12 17:48:04 +0000950 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000951
Damien Miller95def091999-11-25 00:26:21 +1100952 /* Fill configuration defaults. */
953 fill_default_options(&options);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000954
Damien Miller13f97b22014-02-24 15:57:55 +1100955 if (options.port == 0)
956 options.port = default_ssh_port();
Darren Tucker0a4f04b2003-07-03 20:37:47 +1000957 channel_set_af(options.address_family);
958
Damien Millere9fc72e2013-10-15 12:14:12 +1100959 /* Tidy and check options */
960 if (options.host_key_alias != NULL)
961 lowercase(options.host_key_alias);
962 if (options.proxy_command != NULL &&
963 strcmp(options.proxy_command, "-") == 0 &&
964 options.proxy_use_fdpass)
965 fatal("ProxyCommand=- and ProxyUseFDPass are incompatible");
Damien Miller0faf7472013-10-17 11:47:23 +1100966#ifndef HAVE_CYGWIN
967 if (original_effective_uid != 0)
968 options.use_privileged_port = 0;
969#endif
Damien Millere9fc72e2013-10-15 12:14:12 +1100970
Damien Miller95def091999-11-25 00:26:21 +1100971 /* reinit */
Darren Tucker72efd742009-06-21 17:48:00 +1000972 log_init(argv0, options.log_level, SYSLOG_FACILITY_USER, !use_syslog);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000973
Damien Millerfff9f092012-07-06 13:45:01 +1000974 if (options.request_tty == REQUEST_TTY_YES ||
975 options.request_tty == REQUEST_TTY_FORCE)
976 tty_flag = 1;
977
978 /* Allocate a tty by default if no command specified. */
979 if (buffer_len(&command) == 0)
980 tty_flag = options.request_tty != REQUEST_TTY_NO;
981
982 /* Force no tty */
983 if (options.request_tty == REQUEST_TTY_NO || muxclient_command != 0)
984 tty_flag = 0;
985 /* Do not allocate a tty if stdin is not a tty. */
986 if ((!isatty(fileno(stdin)) || stdin_null_flag) &&
987 options.request_tty != REQUEST_TTY_FORCE) {
988 if (tty_flag)
989 logit("Pseudo-terminal will not be allocated because "
990 "stdin is not a terminal.");
991 tty_flag = 0;
992 }
993
Damien Miller60bc5172001-03-19 09:38:15 +1100994 seed_rng();
995
Damien Miller95def091999-11-25 00:26:21 +1100996 if (options.user == NULL)
997 options.user = xstrdup(pw->pw_name);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000998
Damien Millerdfc85fa2011-05-15 08:44:02 +1000999 if (gethostname(thishost, sizeof(thishost)) == -1)
1000 fatal("gethostname: %s", strerror(errno));
1001 strlcpy(shorthost, thishost, sizeof(shorthost));
1002 shorthost[strcspn(thishost, ".")] = '\0';
1003 snprintf(portstr, sizeof(portstr), "%d", options.port);
Darren Tuckerf6b01b72008-06-13 04:56:37 +10001004
Damien Millerdfc85fa2011-05-15 08:44:02 +10001005 if (options.local_command != NULL) {
Darren Tuckerf6b01b72008-06-13 04:56:37 +10001006 debug3("expanding LocalCommand: %s", options.local_command);
1007 cp = options.local_command;
1008 options.local_command = percent_expand(cp, "d", pw->pw_dir,
Damien Miller83f8a402011-01-07 09:51:17 +11001009 "h", host, "l", thishost, "n", host_arg, "r", options.user,
Damien Millerdfc85fa2011-05-15 08:44:02 +10001010 "p", portstr, "u", pw->pw_name, "L", shorthost,
1011 (char *)NULL);
Darren Tuckerf6b01b72008-06-13 04:56:37 +10001012 debug3("expanded LocalCommand: %s", options.local_command);
Darren Tuckera627d422013-06-02 07:31:17 +10001013 free(cp);
Darren Tuckerf6b01b72008-06-13 04:56:37 +10001014 }
1015
Damien Miller0e220db2004-06-15 10:34:08 +10001016 if (options.control_path != NULL) {
Damien Miller6476cad2005-06-16 13:18:34 +10001017 cp = tilde_expand_filename(options.control_path,
1018 original_real_uid);
Darren Tuckera627d422013-06-02 07:31:17 +10001019 free(options.control_path);
Damien Millerdfc85fa2011-05-15 08:44:02 +10001020 options.control_path = percent_expand(cp, "h", host,
1021 "l", thishost, "n", host_arg, "r", options.user,
1022 "p", portstr, "u", pw->pw_name, "L", shorthost,
1023 (char *)NULL);
Darren Tuckera627d422013-06-02 07:31:17 +10001024 free(cp);
Damien Miller0e220db2004-06-15 10:34:08 +10001025 }
Damien Millerb1cbfa22008-05-19 16:00:08 +10001026 if (muxclient_command != 0 && options.control_path == NULL)
Darren Tucker0814d312005-06-01 23:08:51 +10001027 fatal("No ControlPath specified for \"-O\" command");
Damien Millerd14b1e72005-06-16 13:19:41 +10001028 if (options.control_path != NULL)
Damien Millerb1cbfa22008-05-19 16:00:08 +10001029 muxclient(options.control_path);
Damien Miller0e220db2004-06-15 10:34:08 +10001030
Damien Miller08b57c62014-02-27 10:17:13 +11001031 /*
1032 * If hostname canonicalisation was not enabled, then we may not
1033 * have yet resolved the hostname. Do so now.
1034 */
1035 if (addrs == NULL && options.proxy_command == NULL) {
1036 if ((addrs = resolve_host(host, options.port, 1,
1037 cname, sizeof(cname))) == NULL)
1038 cleanup_exit(255); /* resolve_host logs the error */
1039 }
1040
Damien Miller67bd0622007-09-17 12:06:57 +10001041 timeout_ms = options.connection_timeout * 1000;
1042
Kevin Stevesfcec7f82000-12-15 19:55:48 +00001043 /* Open a connection to the remote host. */
Damien Miller0faf7472013-10-17 11:47:23 +11001044 if (ssh_connect(host, addrs, &hostaddr, options.port,
1045 options.address_family, options.connection_attempts,
1046 &timeout_ms, options.tcp_keep_alive,
1047 options.use_privileged_port) != 0)
1048 exit(255);
1049
Damien Miller28631ce2013-10-26 10:07:56 +11001050 if (addrs != NULL)
1051 freeaddrinfo(addrs);
1052
Damien Miller0faf7472013-10-17 11:47:23 +11001053 packet_set_timeout(options.server_alive_interval,
1054 options.server_alive_count_max);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001055
Damien Miller67bd0622007-09-17 12:06:57 +10001056 if (timeout_ms > 0)
1057 debug3("timeout: %d ms remain after connect", timeout_ms);
1058
Damien Miller5428f641999-11-25 11:54:57 +11001059 /*
1060 * If we successfully made the connection, load the host private key
1061 * in case we will need it later for combined rsa-rhosts
1062 * authentication. This must be done before releasing extra
1063 * privileges, because the file is only readable by root.
Ben Lindstrom9e5bb572002-06-06 19:58:27 +00001064 * If we cannot access the private keys, load the public keys
1065 * instead and try to execute the ssh-keysign helper instead.
Damien Miller5428f641999-11-25 11:54:57 +11001066 */
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001067 sensitive_data.nkeys = 0;
1068 sensitive_data.keys = NULL;
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001069 sensitive_data.external_keysign = 0;
Ben Lindstrom24157572002-06-12 16:09:39 +00001070 if (options.rhosts_rsa_authentication ||
1071 options.hostbased_authentication) {
Damien Miller0fa47cf2013-12-29 17:53:39 +11001072 sensitive_data.nkeys = 9;
Damien Millerddd63ab2006-03-31 23:10:51 +11001073 sensitive_data.keys = xcalloc(sensitive_data.nkeys,
Ben Lindstroma962c2f2002-07-04 00:14:17 +00001074 sizeof(Key));
Damien Miller6af914a2010-09-10 11:39:26 +10001075 for (i = 0; i < sensitive_data.nkeys; i++)
1076 sensitive_data.keys[i] = NULL;
Ben Lindstromf9c48842002-06-11 16:37:51 +00001077
1078 PRIV_START;
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001079 sensitive_data.keys[0] = key_load_private_type(KEY_RSA1,
Darren Tucker232b76f2006-05-06 17:41:51 +10001080 _PATH_HOST_KEY_FILE, "", NULL, NULL);
Damien Millerc1583312010-08-05 13:04:50 +10001081 sensitive_data.keys[1] = key_load_private_cert(KEY_DSA,
1082 _PATH_HOST_DSA_KEY_FILE, "", NULL);
Damien Miller6af914a2010-09-10 11:39:26 +10001083#ifdef OPENSSL_HAS_ECC
Damien Millereb8b60e2010-08-31 22:41:14 +10001084 sensitive_data.keys[2] = key_load_private_cert(KEY_ECDSA,
1085 _PATH_HOST_ECDSA_KEY_FILE, "", NULL);
Damien Miller6af914a2010-09-10 11:39:26 +10001086#endif
Damien Millereb8b60e2010-08-31 22:41:14 +10001087 sensitive_data.keys[3] = key_load_private_cert(KEY_RSA,
Damien Millerc1583312010-08-05 13:04:50 +10001088 _PATH_HOST_RSA_KEY_FILE, "", NULL);
Damien Miller0fa47cf2013-12-29 17:53:39 +11001089 sensitive_data.keys[4] = key_load_private_cert(KEY_ED25519,
1090 _PATH_HOST_ED25519_KEY_FILE, "", NULL);
1091 sensitive_data.keys[5] = key_load_private_type(KEY_DSA,
Darren Tucker232b76f2006-05-06 17:41:51 +10001092 _PATH_HOST_DSA_KEY_FILE, "", NULL, NULL);
Damien Miller6af914a2010-09-10 11:39:26 +10001093#ifdef OPENSSL_HAS_ECC
Damien Miller0fa47cf2013-12-29 17:53:39 +11001094 sensitive_data.keys[6] = key_load_private_type(KEY_ECDSA,
Damien Millereb8b60e2010-08-31 22:41:14 +10001095 _PATH_HOST_ECDSA_KEY_FILE, "", NULL, NULL);
Damien Miller6af914a2010-09-10 11:39:26 +10001096#endif
Damien Miller0fa47cf2013-12-29 17:53:39 +11001097 sensitive_data.keys[7] = key_load_private_type(KEY_RSA,
Darren Tucker232b76f2006-05-06 17:41:51 +10001098 _PATH_HOST_RSA_KEY_FILE, "", NULL, NULL);
Damien Miller0fa47cf2013-12-29 17:53:39 +11001099 sensitive_data.keys[8] = key_load_private_type(KEY_ED25519,
Damien Miller5be9d9e2013-12-07 11:24:01 +11001100 _PATH_HOST_ED25519_KEY_FILE, "", NULL, NULL);
Ben Lindstromf9c48842002-06-11 16:37:51 +00001101 PRIV_END;
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001102
Ben Lindstrom5d35a2f2002-07-04 00:19:40 +00001103 if (options.hostbased_authentication == 1 &&
1104 sensitive_data.keys[0] == NULL &&
Damien Millereb8b60e2010-08-31 22:41:14 +10001105 sensitive_data.keys[5] == NULL &&
Damien Miller5be9d9e2013-12-07 11:24:01 +11001106 sensitive_data.keys[6] == NULL &&
Damien Miller0fa47cf2013-12-29 17:53:39 +11001107 sensitive_data.keys[7] == NULL &&
1108 sensitive_data.keys[8] == NULL) {
Damien Millerc1583312010-08-05 13:04:50 +10001109 sensitive_data.keys[1] = key_load_cert(
1110 _PATH_HOST_DSA_KEY_FILE);
Damien Miller6af914a2010-09-10 11:39:26 +10001111#ifdef OPENSSL_HAS_ECC
Damien Millerc1583312010-08-05 13:04:50 +10001112 sensitive_data.keys[2] = key_load_cert(
Damien Millereb8b60e2010-08-31 22:41:14 +10001113 _PATH_HOST_ECDSA_KEY_FILE);
Damien Miller6af914a2010-09-10 11:39:26 +10001114#endif
Damien Millereb8b60e2010-08-31 22:41:14 +10001115 sensitive_data.keys[3] = key_load_cert(
Damien Millerc1583312010-08-05 13:04:50 +10001116 _PATH_HOST_RSA_KEY_FILE);
Damien Miller0fa47cf2013-12-29 17:53:39 +11001117 sensitive_data.keys[4] = key_load_cert(
1118 _PATH_HOST_ED25519_KEY_FILE);
1119 sensitive_data.keys[5] = key_load_public(
Damien Millereb8b60e2010-08-31 22:41:14 +10001120 _PATH_HOST_DSA_KEY_FILE, NULL);
Damien Miller6af914a2010-09-10 11:39:26 +10001121#ifdef OPENSSL_HAS_ECC
Damien Miller0fa47cf2013-12-29 17:53:39 +11001122 sensitive_data.keys[6] = key_load_public(
Damien Millereb8b60e2010-08-31 22:41:14 +10001123 _PATH_HOST_ECDSA_KEY_FILE, NULL);
Damien Miller6af914a2010-09-10 11:39:26 +10001124#endif
Damien Miller5be9d9e2013-12-07 11:24:01 +11001125 sensitive_data.keys[7] = key_load_public(
Damien Miller0fa47cf2013-12-29 17:53:39 +11001126 _PATH_HOST_RSA_KEY_FILE, NULL);
1127 sensitive_data.keys[8] = key_load_public(
Damien Miller5be9d9e2013-12-07 11:24:01 +11001128 _PATH_HOST_ED25519_KEY_FILE, NULL);
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001129 sensitive_data.external_keysign = 1;
1130 }
Damien Miller95def091999-11-25 00:26:21 +11001131 }
Damien Miller5428f641999-11-25 11:54:57 +11001132 /*
1133 * Get rid of any extra privileges that we may have. We will no
1134 * longer need them. Also, extra privileges could make it very hard
1135 * to read identity files and other non-world-readable files from the
1136 * user's home directory if it happens to be on a NFS volume where
1137 * root is mapped to nobody.
1138 */
Darren Tucker25f60a72004-08-15 17:23:34 +10001139 if (original_effective_uid == 0) {
1140 PRIV_START;
1141 permanently_set_uid(pw);
1142 }
Damien Miller95def091999-11-25 00:26:21 +11001143
Damien Miller5428f641999-11-25 11:54:57 +11001144 /*
1145 * Now that we are back to our own permissions, create ~/.ssh
Damien Miller788f2122005-11-05 15:14:59 +11001146 * directory if it doesn't already exist.
Damien Miller5428f641999-11-25 11:54:57 +11001147 */
Darren Tucker45c66d72011-11-04 10:50:40 +11001148 if (config == NULL) {
1149 r = snprintf(buf, sizeof buf, "%s%s%s", pw->pw_dir,
1150 strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR);
1151 if (r > 0 && (size_t)r < sizeof(buf) && stat(buf, &st) < 0) {
Darren Tucker8ccb7392010-09-10 12:28:24 +10001152#ifdef WITH_SELINUX
Darren Tucker45c66d72011-11-04 10:50:40 +11001153 ssh_selinux_setfscreatecon(buf);
Darren Tucker8ccb7392010-09-10 12:28:24 +10001154#endif
Darren Tucker45c66d72011-11-04 10:50:40 +11001155 if (mkdir(buf, 0700) < 0)
1156 error("Could not create directory '%.200s'.",
1157 buf);
Darren Tucker8ccb7392010-09-10 12:28:24 +10001158#ifdef WITH_SELINUX
Darren Tucker45c66d72011-11-04 10:50:40 +11001159 ssh_selinux_setfscreatecon(NULL);
Darren Tucker8ccb7392010-09-10 12:28:24 +10001160#endif
Darren Tucker45c66d72011-11-04 10:50:40 +11001161 }
Darren Tucker8ccb7392010-09-10 12:28:24 +10001162 }
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001163 /* load options.identity_files */
1164 load_public_identity_files();
1165
1166 /* Expand ~ in known host file names. */
Damien Miller295ee632011-05-29 21:42:31 +10001167 tilde_expand_paths(options.system_hostfiles,
1168 options.num_system_hostfiles);
1169 tilde_expand_paths(options.user_hostfiles, options.num_user_hostfiles);
Damien Miller95def091999-11-25 00:26:21 +11001170
Damien Miller07cd5892001-11-12 10:52:03 +11001171 signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
Damien Miller857b02e2010-09-24 22:02:56 +10001172 signal(SIGCHLD, main_sigchld_handler);
Damien Miller07cd5892001-11-12 10:52:03 +11001173
Darren Tuckerd6173c02008-06-13 04:52:53 +10001174 /* Log into the remote system. Never returns if the login fails. */
Damien Miller67bd0622007-09-17 12:06:57 +10001175 ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr,
Damien Millerd925dcd2010-12-01 12:21:51 +11001176 options.port, pw, timeout_ms);
Damien Miller95def091999-11-25 00:26:21 +11001177
Damien Miller383ffe62010-06-26 10:02:03 +10001178 if (packet_connection_is_on_socket()) {
1179 verbose("Authenticated to %s ([%s]:%d).", host,
1180 get_remote_ipaddr(), get_remote_port());
1181 } else {
1182 verbose("Authenticated to %s (via proxy).", host);
1183 }
1184
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001185 /* We no longer need the private host keys. Clear them now. */
1186 if (sensitive_data.nkeys != 0) {
1187 for (i = 0; i < sensitive_data.nkeys; i++) {
1188 if (sensitive_data.keys[i] != NULL) {
1189 /* Destroys contents safely */
1190 debug3("clear hostkey %d", i);
1191 key_free(sensitive_data.keys[i]);
1192 sensitive_data.keys[i] = NULL;
1193 }
1194 }
Darren Tuckera627d422013-06-02 07:31:17 +10001195 free(sensitive_data.keys);
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001196 }
Ben Lindstroma6c8a8d2001-08-06 21:42:00 +00001197 for (i = 0; i < options.num_identity_files; i++) {
Darren Tuckera627d422013-06-02 07:31:17 +10001198 free(options.identity_files[i]);
1199 options.identity_files[i] = NULL;
Ben Lindstroma6c8a8d2001-08-06 21:42:00 +00001200 if (options.identity_keys[i]) {
1201 key_free(options.identity_keys[i]);
1202 options.identity_keys[i] = NULL;
1203 }
1204 }
Damien Miller95def091999-11-25 00:26:21 +11001205
Damien Miller1383bd82000-04-06 12:32:37 +10001206 exit_status = compat20 ? ssh_session2() : ssh_session();
1207 packet_close();
Damien Miller8c4e18a2002-09-19 12:05:02 +10001208
Damien Millerb1cbfa22008-05-19 16:00:08 +10001209 if (options.control_path != NULL && muxserver_sock != -1)
Damien Miller0e220db2004-06-15 10:34:08 +10001210 unlink(options.control_path);
1211
Damien Millera41ccca2010-10-07 22:07:32 +11001212 /* Kill ProxyCommand if it is running. */
1213 ssh_kill_proxy_command();
Damien Miller8c4e18a2002-09-19 12:05:02 +10001214
Damien Miller1383bd82000-04-06 12:32:37 +10001215 return exit_status;
1216}
1217
Damien Millere11e1ea2010-08-03 16:04:46 +10001218static void
1219control_persist_detach(void)
1220{
1221 pid_t pid;
Damien Miller00d9ae22010-08-17 01:59:31 +10001222 int devnull;
Damien Millere11e1ea2010-08-03 16:04:46 +10001223
1224 debug("%s: backgrounding master process", __func__);
1225
1226 /*
1227 * master (current process) into the background, and make the
1228 * foreground process a client of the backgrounded master.
1229 */
1230 switch ((pid = fork())) {
1231 case -1:
1232 fatal("%s: fork: %s", __func__, strerror(errno));
1233 case 0:
1234 /* Child: master process continues mainloop */
1235 break;
1236 default:
1237 /* Parent: set up mux slave to connect to backgrounded master */
1238 debug2("%s: background process is %ld", __func__, (long)pid);
1239 stdin_null_flag = ostdin_null_flag;
Damien Miller21771e22011-05-15 08:45:50 +10001240 options.request_tty = orequest_tty;
Damien Millere11e1ea2010-08-03 16:04:46 +10001241 tty_flag = otty_flag;
1242 close(muxserver_sock);
1243 muxserver_sock = -1;
Damien Miller5929c522010-09-10 11:17:02 +10001244 options.control_master = SSHCTL_MASTER_NO;
Damien Millere11e1ea2010-08-03 16:04:46 +10001245 muxclient(options.control_path);
1246 /* muxclient() doesn't return on success. */
1247 fatal("Failed to connect to new control master");
1248 }
Damien Miller00d9ae22010-08-17 01:59:31 +10001249 if ((devnull = open(_PATH_DEVNULL, O_RDWR)) == -1) {
1250 error("%s: open(\"/dev/null\"): %s", __func__,
1251 strerror(errno));
1252 } else {
1253 if (dup2(devnull, STDIN_FILENO) == -1 ||
1254 dup2(devnull, STDOUT_FILENO) == -1)
1255 error("%s: dup2: %s", __func__, strerror(errno));
1256 if (devnull > STDERR_FILENO)
1257 close(devnull);
1258 }
Damien Miller98e27dc2013-07-25 11:55:52 +10001259 daemon(1, 1);
Damien Millerea2c1a42011-06-03 12:10:22 +10001260 setproctitle("%s [mux]", options.control_path);
Damien Millere11e1ea2010-08-03 16:04:46 +10001261}
1262
1263/* Do fork() after authentication. Used by "ssh -f" */
1264static void
1265fork_postauth(void)
1266{
1267 if (need_controlpersist_detach)
1268 control_persist_detach();
1269 debug("forking to background");
1270 fork_after_authentication_flag = 0;
1271 if (daemon(1, 1) < 0)
1272 fatal("daemon() failed: %.200s", strerror(errno));
1273}
1274
Darren Tucker9f407c42008-06-13 04:50:27 +10001275/* Callback for remote forward global requests */
1276static void
1277ssh_confirm_remote_forward(int type, u_int32_t seq, void *ctxt)
1278{
1279 Forward *rfwd = (Forward *)ctxt;
1280
Damien Miller4bf648f2009-02-14 16:28:21 +11001281 /* XXX verbose() on failure? */
Damien Miller4b3ed642014-07-02 15:29:40 +10001282 debug("remote forward %s for: listen %s%s%d, connect %s:%d",
Darren Tucker9f407c42008-06-13 04:50:27 +10001283 type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
Damien Miller4b3ed642014-07-02 15:29:40 +10001284 rfwd->listen_host == NULL ? "" : rfwd->listen_host,
1285 rfwd->listen_host == NULL ? "" : ":",
Darren Tucker9f407c42008-06-13 04:50:27 +10001286 rfwd->listen_port, rfwd->connect_host, rfwd->connect_port);
Darren Tucker68afb8c2011-10-02 18:59:03 +11001287 if (rfwd->listen_port == 0) {
1288 if (type == SSH2_MSG_REQUEST_SUCCESS) {
1289 rfwd->allocated_port = packet_get_int();
1290 logit("Allocated port %u for remote forward to %s:%d",
1291 rfwd->allocated_port,
1292 rfwd->connect_host, rfwd->connect_port);
1293 channel_update_permitted_opens(rfwd->handle,
1294 rfwd->allocated_port);
1295 } else {
1296 channel_update_permitted_opens(rfwd->handle, -1);
1297 }
Damien Miller4bf648f2009-02-14 16:28:21 +11001298 }
1299
Darren Tucker9f407c42008-06-13 04:50:27 +10001300 if (type == SSH2_MSG_REQUEST_FAILURE) {
1301 if (options.exit_on_forward_failure)
1302 fatal("Error: remote port forwarding failed for "
1303 "listen port %d", rfwd->listen_port);
1304 else
1305 logit("Warning: remote port forwarding failed for "
1306 "listen port %d", rfwd->listen_port);
1307 }
Darren Tucker9a2a6092008-07-04 12:53:50 +10001308 if (++remote_forward_confirms_received == options.num_remote_forwards) {
Darren Tucker9f407c42008-06-13 04:50:27 +10001309 debug("All remote forwarding requests processed");
Damien Millere11e1ea2010-08-03 16:04:46 +10001310 if (fork_after_authentication_flag)
1311 fork_postauth();
Darren Tucker9a2a6092008-07-04 12:53:50 +10001312 }
Darren Tucker9f407c42008-06-13 04:50:27 +10001313}
1314
Ben Lindstrombba81212001-06-25 05:01:22 +00001315static void
Darren Tucker7ad8dd22010-01-12 19:40:27 +11001316client_cleanup_stdio_fwd(int id, void *arg)
1317{
1318 debug("stdio forwarding: done");
1319 cleanup_exit(0);
1320}
1321
Darren Tucker2d6665d2011-11-04 10:54:22 +11001322static void
1323ssh_init_stdio_forwarding(void)
Darren Tucker7ad8dd22010-01-12 19:40:27 +11001324{
1325 Channel *c;
Damien Millere1537f92010-01-26 13:26:22 +11001326 int in, out;
Darren Tucker7ad8dd22010-01-12 19:40:27 +11001327
Darren Tucker2d6665d2011-11-04 10:54:22 +11001328 if (stdio_forward_host == NULL)
1329 return;
Damien Miller386feab2013-10-15 12:14:49 +11001330 if (!compat20)
Darren Tucker2d6665d2011-11-04 10:54:22 +11001331 fatal("stdio forwarding require Protocol 2");
Damien Millere1537f92010-01-26 13:26:22 +11001332
Darren Tucker2d6665d2011-11-04 10:54:22 +11001333 debug3("%s: %s:%d", __func__, stdio_forward_host, stdio_forward_port);
1334
1335 if ((in = dup(STDIN_FILENO)) < 0 ||
1336 (out = dup(STDOUT_FILENO)) < 0)
Damien Millere1537f92010-01-26 13:26:22 +11001337 fatal("channel_connect_stdio_fwd: dup() in/out failed");
Darren Tucker2d6665d2011-11-04 10:54:22 +11001338 if ((c = channel_connect_stdio_fwd(stdio_forward_host,
1339 stdio_forward_port, in, out)) == NULL)
1340 fatal("%s: channel_connect_stdio_fwd failed", __func__);
Darren Tucker7ad8dd22010-01-12 19:40:27 +11001341 channel_register_cleanup(c->self, client_cleanup_stdio_fwd, 0);
Darren Tucker7ad8dd22010-01-12 19:40:27 +11001342}
1343
1344static void
Damien Miller0bc1bd82000-11-13 22:57:25 +11001345ssh_init_forwarding(void)
1346{
Kevin Steves12057502001-02-05 14:54:34 +00001347 int success = 0;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001348 int i;
Kevin Steves12057502001-02-05 14:54:34 +00001349
Damien Miller0bc1bd82000-11-13 22:57:25 +11001350 /* Initiate local TCP/IP port forwardings. */
1351 for (i = 0; i < options.num_local_forwards; i++) {
Damien Millerf91ee4c2005-03-01 21:24:33 +11001352 debug("Local connections to %.200s:%d forwarded to remote "
1353 "address %.200s:%d",
Darren Tucker47eede72005-03-14 23:08:12 +11001354 (options.local_forwards[i].listen_host == NULL) ?
1355 (options.gateway_ports ? "*" : "LOCALHOST") :
Damien Millerf91ee4c2005-03-01 21:24:33 +11001356 options.local_forwards[i].listen_host,
1357 options.local_forwards[i].listen_port,
1358 options.local_forwards[i].connect_host,
1359 options.local_forwards[i].connect_port);
Damien Millerb16461c2002-01-22 23:29:22 +11001360 success += channel_setup_local_fwd_listener(
Damien Millerf91ee4c2005-03-01 21:24:33 +11001361 options.local_forwards[i].listen_host,
1362 options.local_forwards[i].listen_port,
1363 options.local_forwards[i].connect_host,
1364 options.local_forwards[i].connect_port,
Damien Miller0bc1bd82000-11-13 22:57:25 +11001365 options.gateway_ports);
1366 }
Darren Tuckere7d4b192006-07-12 22:17:10 +10001367 if (i > 0 && success != i && options.exit_on_forward_failure)
1368 fatal("Could not request local forwarding.");
Kevin Steves12057502001-02-05 14:54:34 +00001369 if (i > 0 && success == 0)
1370 error("Could not request local forwarding.");
Damien Miller0bc1bd82000-11-13 22:57:25 +11001371
1372 /* Initiate remote TCP/IP port forwardings. */
1373 for (i = 0; i < options.num_remote_forwards; i++) {
Damien Millerf91ee4c2005-03-01 21:24:33 +11001374 debug("Remote connections from %.200s:%d forwarded to "
1375 "local address %.200s:%d",
Damien Miller46d38de2005-07-17 17:02:09 +10001376 (options.remote_forwards[i].listen_host == NULL) ?
Damien Milleraa3bb102005-11-05 15:12:59 +11001377 "LOCALHOST" : options.remote_forwards[i].listen_host,
Damien Millerf91ee4c2005-03-01 21:24:33 +11001378 options.remote_forwards[i].listen_port,
1379 options.remote_forwards[i].connect_host,
1380 options.remote_forwards[i].connect_port);
Darren Tucker68afb8c2011-10-02 18:59:03 +11001381 options.remote_forwards[i].handle =
1382 channel_request_remote_forwarding(
Damien Millerf91ee4c2005-03-01 21:24:33 +11001383 options.remote_forwards[i].listen_host,
1384 options.remote_forwards[i].listen_port,
1385 options.remote_forwards[i].connect_host,
Darren Tucker68afb8c2011-10-02 18:59:03 +11001386 options.remote_forwards[i].connect_port);
1387 if (options.remote_forwards[i].handle < 0) {
Darren Tuckere7d4b192006-07-12 22:17:10 +10001388 if (options.exit_on_forward_failure)
1389 fatal("Could not request remote forwarding.");
1390 else
1391 logit("Warning: Could not request remote "
1392 "forwarding.");
Darren Tucker68afb8c2011-10-02 18:59:03 +11001393 } else {
1394 client_register_global_confirm(ssh_confirm_remote_forward,
1395 &options.remote_forwards[i]);
Darren Tuckere7d4b192006-07-12 22:17:10 +10001396 }
Damien Miller0bc1bd82000-11-13 22:57:25 +11001397 }
Damien Millerb3ce9fe2007-08-08 14:32:41 +10001398
1399 /* Initiate tunnel forwarding. */
1400 if (options.tun_open != SSH_TUNMODE_NO) {
1401 if (client_request_tun_fwd(options.tun_open,
1402 options.tun_local, options.tun_remote) == -1) {
1403 if (options.exit_on_forward_failure)
1404 fatal("Could not request tunnel forwarding.");
1405 else
1406 error("Could not request tunnel forwarding.");
1407 }
1408 }
Damien Miller0bc1bd82000-11-13 22:57:25 +11001409}
1410
Ben Lindstrombba81212001-06-25 05:01:22 +00001411static void
Damien Miller0bc1bd82000-11-13 22:57:25 +11001412check_agent_present(void)
1413{
1414 if (options.forward_agent) {
Damien Miller788f2122005-11-05 15:14:59 +11001415 /* Clear agent forwarding if we don't have an agent. */
Damien Miller789e95d2002-09-12 09:52:46 +10001416 if (!ssh_agent_present())
Damien Miller0bc1bd82000-11-13 22:57:25 +11001417 options.forward_agent = 0;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001418 }
1419}
1420
Ben Lindstrombba81212001-06-25 05:01:22 +00001421static int
Damien Miller1383bd82000-04-06 12:32:37 +10001422ssh_session(void)
1423{
1424 int type;
Damien Miller1383bd82000-04-06 12:32:37 +10001425 int interactive = 0;
1426 int have_tty = 0;
1427 struct winsize ws;
Damien Miller1383bd82000-04-06 12:32:37 +10001428 char *cp;
Damien Miller17e7ed02005-06-17 12:54:33 +10001429 const char *display;
Damien Miller1383bd82000-04-06 12:32:37 +10001430
Damien Miller95def091999-11-25 00:26:21 +11001431 /* Enable compression if requested. */
1432 if (options.compression) {
Darren Tuckerd6173c02008-06-13 04:52:53 +10001433 debug("Requesting compression at level %d.",
1434 options.compression_level);
Damien Miller95def091999-11-25 00:26:21 +11001435
Darren Tuckerd6173c02008-06-13 04:52:53 +10001436 if (options.compression_level < 1 ||
1437 options.compression_level > 9)
1438 fatal("Compression level must be from 1 (fast) to "
1439 "9 (slow, best).");
Damien Miller95def091999-11-25 00:26:21 +11001440
1441 /* Send the request. */
1442 packet_start(SSH_CMSG_REQUEST_COMPRESSION);
1443 packet_put_int(options.compression_level);
1444 packet_send();
1445 packet_write_wait();
Damien Millerdff50992002-01-22 23:16:32 +11001446 type = packet_read();
Damien Miller95def091999-11-25 00:26:21 +11001447 if (type == SSH_SMSG_SUCCESS)
1448 packet_start_compression(options.compression_level);
1449 else if (type == SSH_SMSG_FAILURE)
Damien Miller996acd22003-04-09 20:59:48 +10001450 logit("Warning: Remote host refused compression.");
Damien Miller95def091999-11-25 00:26:21 +11001451 else
Darren Tuckerd6173c02008-06-13 04:52:53 +10001452 packet_disconnect("Protocol error waiting for "
1453 "compression response.");
Damien Miller95def091999-11-25 00:26:21 +11001454 }
1455 /* Allocate a pseudo tty if appropriate. */
1456 if (tty_flag) {
1457 debug("Requesting pty.");
1458
1459 /* Start the packet. */
1460 packet_start(SSH_CMSG_REQUEST_PTY);
1461
1462 /* Store TERM in the packet. There is no limit on the
1463 length of the string. */
1464 cp = getenv("TERM");
1465 if (!cp)
1466 cp = "";
Ben Lindstrom664408d2001-06-09 01:42:01 +00001467 packet_put_cstring(cp);
Damien Miller95def091999-11-25 00:26:21 +11001468
1469 /* Store window size in the packet. */
1470 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
1471 memset(&ws, 0, sizeof(ws));
Damien Miller71a73672006-03-26 14:04:36 +11001472 packet_put_int((u_int)ws.ws_row);
1473 packet_put_int((u_int)ws.ws_col);
1474 packet_put_int((u_int)ws.ws_xpixel);
1475 packet_put_int((u_int)ws.ws_ypixel);
Damien Miller95def091999-11-25 00:26:21 +11001476
1477 /* Store tty modes in the packet. */
Ben Lindstromae8e2d32001-04-14 23:13:02 +00001478 tty_make_modes(fileno(stdin), NULL);
Damien Miller95def091999-11-25 00:26:21 +11001479
1480 /* Send the packet, and wait for it to leave. */
1481 packet_send();
1482 packet_write_wait();
1483
1484 /* Read response from the server. */
Damien Millerdff50992002-01-22 23:16:32 +11001485 type = packet_read();
Damien Miller450a7a12000-03-26 13:04:51 +10001486 if (type == SSH_SMSG_SUCCESS) {
Damien Miller95def091999-11-25 00:26:21 +11001487 interactive = 1;
Damien Miller1383bd82000-04-06 12:32:37 +10001488 have_tty = 1;
Damien Miller450a7a12000-03-26 13:04:51 +10001489 } else if (type == SSH_SMSG_FAILURE)
Darren Tuckerd6173c02008-06-13 04:52:53 +10001490 logit("Warning: Remote host failed or refused to "
1491 "allocate a pseudo tty.");
Damien Miller95def091999-11-25 00:26:21 +11001492 else
Darren Tuckerd6173c02008-06-13 04:52:53 +10001493 packet_disconnect("Protocol error waiting for pty "
1494 "request response.");
Damien Miller95def091999-11-25 00:26:21 +11001495 }
1496 /* Request X11 forwarding if enabled and DISPLAY is set. */
Damien Miller17e7ed02005-06-17 12:54:33 +10001497 display = getenv("DISPLAY");
1498 if (options.forward_x11 && display != NULL) {
Ben Lindstrom4a4bd712001-12-06 17:45:19 +00001499 char *proto, *data;
Damien Millerbd483e72000-04-30 10:00:53 +10001500 /* Get reasonable local authentication information. */
Damien Miller17e7ed02005-06-17 12:54:33 +10001501 client_x11_get_proto(display, options.xauth_location,
Damien Miller386feab2013-10-15 12:14:49 +11001502 options.forward_x11_trusted,
Damien Miller1ab6a512010-06-26 10:02:24 +10001503 options.forward_x11_timeout,
1504 &proto, &data);
Damien Millerbd483e72000-04-30 10:00:53 +10001505 /* Request forwarding with authentication spoofing. */
Darren Tuckerd6173c02008-06-13 04:52:53 +10001506 debug("Requesting X11 forwarding with authentication "
1507 "spoofing.");
Damien Miller6d7b4372011-06-23 08:31:57 +10001508 x11_request_forwarding_with_spoofing(0, display, proto,
1509 data, 0);
Damien Miller95def091999-11-25 00:26:21 +11001510 /* Read response from the server. */
Damien Millerdff50992002-01-22 23:16:32 +11001511 type = packet_read();
Damien Miller95def091999-11-25 00:26:21 +11001512 if (type == SSH_SMSG_SUCCESS) {
Damien Miller95def091999-11-25 00:26:21 +11001513 interactive = 1;
Damien Millerbd483e72000-04-30 10:00:53 +10001514 } else if (type == SSH_SMSG_FAILURE) {
Damien Miller996acd22003-04-09 20:59:48 +10001515 logit("Warning: Remote host denied X11 forwarding.");
Damien Millerbd483e72000-04-30 10:00:53 +10001516 } else {
Darren Tuckerd6173c02008-06-13 04:52:53 +10001517 packet_disconnect("Protocol error waiting for X11 "
1518 "forwarding");
Damien Millerbd483e72000-04-30 10:00:53 +10001519 }
Damien Miller95def091999-11-25 00:26:21 +11001520 }
1521 /* Tell the packet module whether this is an interactive session. */
Damien Miller0dac6fb2010-11-20 15:19:38 +11001522 packet_set_interactive(interactive,
1523 options.ip_qos_interactive, options.ip_qos_bulk);
Damien Miller95def091999-11-25 00:26:21 +11001524
1525 /* Request authentication agent forwarding if appropriate. */
Damien Miller0bc1bd82000-11-13 22:57:25 +11001526 check_agent_present();
1527
Damien Miller95def091999-11-25 00:26:21 +11001528 if (options.forward_agent) {
1529 debug("Requesting authentication agent forwarding.");
1530 auth_request_forwarding();
1531
1532 /* Read response from the server. */
Damien Millerdff50992002-01-22 23:16:32 +11001533 type = packet_read();
Damien Miller48b03fc2002-01-22 23:11:40 +11001534 packet_check_eom();
Damien Miller95def091999-11-25 00:26:21 +11001535 if (type != SSH_SMSG_SUCCESS)
Damien Miller996acd22003-04-09 20:59:48 +10001536 logit("Warning: Remote host denied authentication agent forwarding.");
Damien Miller95def091999-11-25 00:26:21 +11001537 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001538
Damien Miller0bc1bd82000-11-13 22:57:25 +11001539 /* Initiate port forwardings. */
Darren Tucker2d6665d2011-11-04 10:54:22 +11001540 ssh_init_stdio_forwarding();
Damien Miller0bc1bd82000-11-13 22:57:25 +11001541 ssh_init_forwarding();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001542
Darren Tuckerb776c852007-12-02 23:06:35 +11001543 /* Execute a local command */
1544 if (options.local_command != NULL &&
1545 options.permit_local_command)
1546 ssh_local_cmd(options.local_command);
1547
Darren Tucker9a2a6092008-07-04 12:53:50 +10001548 /*
1549 * If requested and we are not interested in replies to remote
1550 * forwarding requests, then let ssh continue in the background.
1551 */
Damien Millere11e1ea2010-08-03 16:04:46 +10001552 if (fork_after_authentication_flag) {
1553 if (options.exit_on_forward_failure &&
1554 options.num_remote_forwards > 0) {
1555 debug("deferring postauth fork until remote forward "
1556 "confirmation received");
1557 } else
1558 fork_postauth();
Darren Tucker9a2a6092008-07-04 12:53:50 +10001559 }
Damien Miller5428f641999-11-25 11:54:57 +11001560
1561 /*
1562 * If a command was specified on the command line, execute the
1563 * command now. Otherwise request the server to start a shell.
1564 */
Damien Miller95def091999-11-25 00:26:21 +11001565 if (buffer_len(&command) > 0) {
1566 int len = buffer_len(&command);
1567 if (len > 900)
1568 len = 900;
Darren Tuckerd6173c02008-06-13 04:52:53 +10001569 debug("Sending command: %.*s", len,
1570 (u_char *)buffer_ptr(&command));
Damien Miller95def091999-11-25 00:26:21 +11001571 packet_start(SSH_CMSG_EXEC_CMD);
1572 packet_put_string(buffer_ptr(&command), buffer_len(&command));
1573 packet_send();
1574 packet_write_wait();
1575 } else {
1576 debug("Requesting shell.");
1577 packet_start(SSH_CMSG_EXEC_SHELL);
1578 packet_send();
1579 packet_write_wait();
1580 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001581
Damien Miller95def091999-11-25 00:26:21 +11001582 /* Enter the interactive session. */
Ben Lindstrom2b1f71b2001-06-05 20:32:21 +00001583 return client_loop(have_tty, tty_flag ?
1584 options.escape_char : SSH_ESCAPECHAR_NONE, 0);
Damien Miller1383bd82000-04-06 12:32:37 +10001585}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001586
Ben Lindstromf558cf62001-09-20 23:13:49 +00001587/* request pty/x11/agent/tcpfwd/shell for channel */
Ben Lindstrombba81212001-06-25 05:01:22 +00001588static void
Damien Millerd530f5f2010-05-21 14:57:10 +10001589ssh_session2_setup(int id, int success, void *arg)
Damien Miller1383bd82000-04-06 12:32:37 +10001590{
Damien Miller3756dce2004-06-18 01:17:29 +10001591 extern char **environ;
Damien Miller17e7ed02005-06-17 12:54:33 +10001592 const char *display;
Damien Miller0e220db2004-06-15 10:34:08 +10001593 int interactive = tty_flag;
Damien Miller17e7ed02005-06-17 12:54:33 +10001594
Damien Millerd530f5f2010-05-21 14:57:10 +10001595 if (!success)
1596 return; /* No need for error message, channels code sens one */
1597
Damien Miller46d38de2005-07-17 17:02:09 +10001598 display = getenv("DISPLAY");
Damien Miller17e7ed02005-06-17 12:54:33 +10001599 if (options.forward_x11 && display != NULL) {
Ben Lindstrom4a4bd712001-12-06 17:45:19 +00001600 char *proto, *data;
Damien Millerbd483e72000-04-30 10:00:53 +10001601 /* Get reasonable local authentication information. */
Damien Miller17e7ed02005-06-17 12:54:33 +10001602 client_x11_get_proto(display, options.xauth_location,
Damien Miller1ab6a512010-06-26 10:02:24 +10001603 options.forward_x11_trusted,
1604 options.forward_x11_timeout, &proto, &data);
Damien Millerbd483e72000-04-30 10:00:53 +10001605 /* Request forwarding with authentication spoofing. */
Darren Tuckerd6173c02008-06-13 04:52:53 +10001606 debug("Requesting X11 forwarding with authentication "
1607 "spoofing.");
Damien Miller6d7b4372011-06-23 08:31:57 +10001608 x11_request_forwarding_with_spoofing(id, display, proto,
1609 data, 1);
1610 client_expect_confirm(id, "X11 forwarding", CONFIRM_WARN);
1611 /* XXX exit_on_forward_failure */
Ben Lindstrombf555ba2001-01-18 02:04:35 +00001612 interactive = 1;
Damien Millerbd483e72000-04-30 10:00:53 +10001613 }
1614
Damien Miller0bc1bd82000-11-13 22:57:25 +11001615 check_agent_present();
1616 if (options.forward_agent) {
1617 debug("Requesting authentication agent forwarding.");
1618 channel_request_start(id, "auth-agent-req@openssh.com", 0);
1619 packet_send();
1620 }
1621
Darren Tucker7b305012012-07-02 18:55:09 +10001622 /* Tell the packet module whether this is an interactive session. */
1623 packet_set_interactive(interactive,
1624 options.ip_qos_interactive, options.ip_qos_bulk);
1625
Damien Miller0e220db2004-06-15 10:34:08 +10001626 client_session2_setup(id, tty_flag, subsystem_flag, getenv("TERM"),
Damien Miller5771ed72008-05-19 15:35:33 +10001627 NULL, fileno(stdin), &command, environ);
Damien Miller1383bd82000-04-06 12:32:37 +10001628}
1629
Ben Lindstromf558cf62001-09-20 23:13:49 +00001630/* open new channel for a session */
Ben Lindstrombba81212001-06-25 05:01:22 +00001631static int
Ben Lindstromf558cf62001-09-20 23:13:49 +00001632ssh_session2_open(void)
Damien Miller1383bd82000-04-06 12:32:37 +10001633{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001634 Channel *c;
1635 int window, packetmax, in, out, err;
Damien Millerad833b32000-08-23 10:46:23 +10001636
Damien Millercaf6dd62000-08-29 11:33:50 +11001637 if (stdin_null_flag) {
Ben Lindstrom31ca54a2001-02-09 02:11:24 +00001638 in = open(_PATH_DEVNULL, O_RDONLY);
Damien Millercaf6dd62000-08-29 11:33:50 +11001639 } else {
1640 in = dup(STDIN_FILENO);
1641 }
1642 out = dup(STDOUT_FILENO);
1643 err = dup(STDERR_FILENO);
1644
1645 if (in < 0 || out < 0 || err < 0)
1646 fatal("dup() in/out/err failed");
1647
Damien Miller69b69aa2000-10-28 14:19:58 +11001648 /* enable nonblocking unless tty */
1649 if (!isatty(in))
1650 set_nonblock(in);
1651 if (!isatty(out))
1652 set_nonblock(out);
1653 if (!isatty(err))
1654 set_nonblock(err);
1655
Damien Millere4340be2000-09-16 13:29:08 +11001656 window = CHAN_SES_WINDOW_DEFAULT;
1657 packetmax = CHAN_SES_PACKET_DEFAULT;
Damien Miller19a59452002-02-19 15:20:57 +11001658 if (tty_flag) {
1659 window >>= 1;
1660 packetmax >>= 1;
Damien Miller1383bd82000-04-06 12:32:37 +10001661 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001662 c = channel_new(
Damien Miller1383bd82000-04-06 12:32:37 +10001663 "session", SSH_CHANNEL_OPENING, in, out, err,
Damien Millere4340be2000-09-16 13:29:08 +11001664 window, packetmax, CHAN_EXTENDED_WRITE,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10001665 "client-session", /*nonblock*/0);
Damien Miller1383bd82000-04-06 12:32:37 +10001666
Ben Lindstromf558cf62001-09-20 23:13:49 +00001667 debug3("ssh_session2_open: channel_new: %d", c->self);
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001668
Ben Lindstrom5ec26452001-06-09 00:18:51 +00001669 channel_send_open(c->self);
Ben Lindstromf558cf62001-09-20 23:13:49 +00001670 if (!no_shell_flag)
Damien Millerb84886b2008-05-19 15:05:07 +10001671 channel_register_open_confirm(c->self,
1672 ssh_session2_setup, NULL);
Damien Miller1383bd82000-04-06 12:32:37 +10001673
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001674 return c->self;
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001675}
1676
Ben Lindstrombba81212001-06-25 05:01:22 +00001677static int
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001678ssh_session2(void)
1679{
Ben Lindstromf558cf62001-09-20 23:13:49 +00001680 int id = -1;
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001681
1682 /* XXX should be pre-session */
Darren Tucker2d6665d2011-11-04 10:54:22 +11001683 if (!options.control_persist)
1684 ssh_init_stdio_forwarding();
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001685 ssh_init_forwarding();
1686
Damien Millere11e1ea2010-08-03 16:04:46 +10001687 /* Start listening for multiplex clients */
1688 muxserver_listen();
1689
1690 /*
Darren Tucker2d6665d2011-11-04 10:54:22 +11001691 * If we are in control persist mode and have a working mux listen
1692 * socket, then prepare to background ourselves and have a foreground
1693 * client attach as a control slave.
1694 * NB. we must save copies of the flags that we override for
Damien Millere11e1ea2010-08-03 16:04:46 +10001695 * the backgrounding, since we defer attachment of the slave until
1696 * after the connection is fully established (in particular,
1697 * async rfwd replies have been received for ExitOnForwardFailure).
1698 */
1699 if (options.control_persist && muxserver_sock != -1) {
1700 ostdin_null_flag = stdin_null_flag;
1701 ono_shell_flag = no_shell_flag;
Damien Miller21771e22011-05-15 08:45:50 +10001702 orequest_tty = options.request_tty;
Damien Millere11e1ea2010-08-03 16:04:46 +10001703 otty_flag = tty_flag;
1704 stdin_null_flag = 1;
1705 no_shell_flag = 1;
Damien Millere11e1ea2010-08-03 16:04:46 +10001706 tty_flag = 0;
1707 if (!fork_after_authentication_flag)
1708 need_controlpersist_detach = 1;
1709 fork_after_authentication_flag = 1;
1710 }
Darren Tucker2d6665d2011-11-04 10:54:22 +11001711 /*
1712 * ControlPersist mux listen socket setup failed, attempt the
1713 * stdio forward setup that we skipped earlier.
1714 */
1715 if (options.control_persist && muxserver_sock == -1)
1716 ssh_init_stdio_forwarding();
Damien Millere11e1ea2010-08-03 16:04:46 +10001717
Ben Lindstromf558cf62001-09-20 23:13:49 +00001718 if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN))
1719 id = ssh_session2_open();
Damien Miller649fe022013-07-18 16:13:55 +10001720 else {
1721 packet_set_interactive(
1722 options.control_master == SSHCTL_MASTER_NO,
1723 options.ip_qos_interactive, options.ip_qos_bulk);
1724 }
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001725
Darren Tucker8901fa92008-06-11 09:34:01 +10001726 /* If we don't expect to open a new session, then disallow it */
Damien Miller456e6f02008-11-03 19:20:10 +11001727 if (options.control_master == SSHCTL_MASTER_NO &&
1728 (datafellows & SSH_NEW_OPENSSH)) {
Darren Tucker8901fa92008-06-11 09:34:01 +10001729 debug("Requesting no-more-sessions@openssh.com");
1730 packet_start(SSH2_MSG_GLOBAL_REQUEST);
1731 packet_put_cstring("no-more-sessions@openssh.com");
1732 packet_put_char(0);
1733 packet_send();
1734 }
1735
Damien Millerd27b9472005-12-13 19:29:02 +11001736 /* Execute a local command */
1737 if (options.local_command != NULL &&
1738 options.permit_local_command)
1739 ssh_local_cmd(options.local_command);
1740
Damien Miller1f25ab42010-07-16 13:56:23 +10001741 /*
1742 * If requested and we are not interested in replies to remote
1743 * forwarding requests, then let ssh continue in the background.
1744 */
Damien Millere11e1ea2010-08-03 16:04:46 +10001745 if (fork_after_authentication_flag) {
1746 if (options.exit_on_forward_failure &&
1747 options.num_remote_forwards > 0) {
1748 debug("deferring postauth fork until remote forward "
1749 "confirmation received");
1750 } else
1751 fork_postauth();
Darren Tucker9a2a6092008-07-04 12:53:50 +10001752 }
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001753
Darren Tuckerf1de4e52010-01-08 16:54:59 +11001754 if (options.use_roaming)
1755 request_roaming();
1756
Ben Lindstrom2b1f71b2001-06-05 20:32:21 +00001757 return client_loop(tty_flag, tty_flag ?
1758 options.escape_char : SSH_ESCAPECHAR_NONE, id);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001759}
Damien Miller0bc1bd82000-11-13 22:57:25 +11001760
Ben Lindstrombba81212001-06-25 05:01:22 +00001761static void
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001762load_public_identity_files(void)
1763{
Damien Miller6b1d53c2006-03-31 23:13:21 +11001764 char *filename, *cp, thishost[NI_MAXHOST];
Darren Tuckerb4fbbc62007-12-02 23:16:32 +11001765 char *pwdir = NULL, *pwname = NULL;
Ben Lindstrom711b04a2001-08-06 21:12:42 +00001766 int i = 0;
Ben Lindstrom0936a5b2002-03-26 03:17:42 +00001767 Key *public;
Damien Miller6b1d53c2006-03-31 23:13:21 +11001768 struct passwd *pw;
Damien Miller0a80ca12010-02-27 07:55:05 +11001769 u_int n_ids;
1770 char *identity_files[SSH_MAX_IDENTITY_FILES];
1771 Key *identity_keys[SSH_MAX_IDENTITY_FILES];
Damien Miller7ea845e2010-02-12 09:21:02 +11001772#ifdef ENABLE_PKCS11
Ben Lindstrom0936a5b2002-03-26 03:17:42 +00001773 Key **keys;
Damien Miller7ea845e2010-02-12 09:21:02 +11001774 int nkeys;
Damien Miller0a80ca12010-02-27 07:55:05 +11001775#endif /* PKCS11 */
Ben Lindstrom0936a5b2002-03-26 03:17:42 +00001776
Damien Miller0a80ca12010-02-27 07:55:05 +11001777 n_ids = 0;
Damien Miller1d2c4562014-02-04 11:18:20 +11001778 memset(identity_files, 0, sizeof(identity_files));
1779 memset(identity_keys, 0, sizeof(identity_keys));
Damien Miller0a80ca12010-02-27 07:55:05 +11001780
1781#ifdef ENABLE_PKCS11
Damien Miller7ea845e2010-02-12 09:21:02 +11001782 if (options.pkcs11_provider != NULL &&
Ben Lindstrom0936a5b2002-03-26 03:17:42 +00001783 options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
Damien Miller7ea845e2010-02-12 09:21:02 +11001784 (pkcs11_init(!options.batch_mode) == 0) &&
1785 (nkeys = pkcs11_add_provider(options.pkcs11_provider, NULL,
1786 &keys)) > 0) {
Damien Miller7ea845e2010-02-12 09:21:02 +11001787 for (i = 0; i < nkeys; i++) {
Damien Miller0a80ca12010-02-27 07:55:05 +11001788 if (n_ids >= SSH_MAX_IDENTITY_FILES) {
1789 key_free(keys[i]);
1790 continue;
1791 }
1792 identity_keys[n_ids] = keys[i];
1793 identity_files[n_ids] =
Damien Miller7ea845e2010-02-12 09:21:02 +11001794 xstrdup(options.pkcs11_provider); /* XXX */
Damien Miller0a80ca12010-02-27 07:55:05 +11001795 n_ids++;
Ben Lindstrom0936a5b2002-03-26 03:17:42 +00001796 }
Darren Tuckera627d422013-06-02 07:31:17 +10001797 free(keys);
Ben Lindstrom711b04a2001-08-06 21:12:42 +00001798 }
Damien Miller7ea845e2010-02-12 09:21:02 +11001799#endif /* ENABLE_PKCS11 */
Damien Miller6b1d53c2006-03-31 23:13:21 +11001800 if ((pw = getpwuid(original_real_uid)) == NULL)
1801 fatal("load_public_identity_files: getpwuid failed");
Darren Tuckere143f062007-12-02 23:21:16 +11001802 pwname = xstrdup(pw->pw_name);
1803 pwdir = xstrdup(pw->pw_dir);
Damien Miller6b1d53c2006-03-31 23:13:21 +11001804 if (gethostname(thishost, sizeof(thishost)) == -1)
1805 fatal("load_public_identity_files: gethostname: %s",
1806 strerror(errno));
Damien Miller0a80ca12010-02-27 07:55:05 +11001807 for (i = 0; i < options.num_identity_files; i++) {
Darren Tucker15fd19c2013-04-05 11:22:26 +11001808 if (n_ids >= SSH_MAX_IDENTITY_FILES ||
1809 strcasecmp(options.identity_files[i], "none") == 0) {
Darren Tuckera627d422013-06-02 07:31:17 +10001810 free(options.identity_files[i]);
Damien Miller0a80ca12010-02-27 07:55:05 +11001811 continue;
1812 }
Damien Miller6b1d53c2006-03-31 23:13:21 +11001813 cp = tilde_expand_filename(options.identity_files[i],
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001814 original_real_uid);
Darren Tuckerb4fbbc62007-12-02 23:16:32 +11001815 filename = percent_expand(cp, "d", pwdir,
1816 "u", pwname, "l", thishost, "h", host,
Damien Miller6b1d53c2006-03-31 23:13:21 +11001817 "r", options.user, (char *)NULL);
Darren Tuckera627d422013-06-02 07:31:17 +10001818 free(cp);
Ben Lindstromd0fca422001-03-26 13:44:06 +00001819 public = key_load_public(filename, NULL);
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001820 debug("identity file %s type %d", filename,
1821 public ? public->type : -1);
Darren Tuckera627d422013-06-02 07:31:17 +10001822 free(options.identity_files[i]);
Damien Miller0a80ca12010-02-27 07:55:05 +11001823 identity_files[n_ids] = filename;
1824 identity_keys[n_ids] = public;
1825
1826 if (++n_ids >= SSH_MAX_IDENTITY_FILES)
1827 continue;
1828
1829 /* Try to add the certificate variant too */
1830 xasprintf(&cp, "%s-cert", filename);
1831 public = key_load_public(cp, NULL);
1832 debug("identity file %s type %d", cp,
1833 public ? public->type : -1);
1834 if (public == NULL) {
Darren Tuckera627d422013-06-02 07:31:17 +10001835 free(cp);
Damien Miller0a80ca12010-02-27 07:55:05 +11001836 continue;
1837 }
1838 if (!key_is_cert(public)) {
1839 debug("%s: key %s type %s is not a certificate",
1840 __func__, cp, key_type(public));
1841 key_free(public);
Darren Tuckera627d422013-06-02 07:31:17 +10001842 free(cp);
Damien Miller0a80ca12010-02-27 07:55:05 +11001843 continue;
1844 }
1845 identity_keys[n_ids] = public;
1846 /* point to the original path, most likely the private key */
1847 identity_files[n_ids] = xstrdup(filename);
1848 n_ids++;
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001849 }
Damien Miller0a80ca12010-02-27 07:55:05 +11001850 options.num_identity_files = n_ids;
1851 memcpy(options.identity_files, identity_files, sizeof(identity_files));
1852 memcpy(options.identity_keys, identity_keys, sizeof(identity_keys));
1853
Damien Miller1d2c4562014-02-04 11:18:20 +11001854 explicit_bzero(pwname, strlen(pwname));
Darren Tuckera627d422013-06-02 07:31:17 +10001855 free(pwname);
Damien Miller1d2c4562014-02-04 11:18:20 +11001856 explicit_bzero(pwdir, strlen(pwdir));
Darren Tuckera627d422013-06-02 07:31:17 +10001857 free(pwdir);
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001858}
Damien Miller857b02e2010-09-24 22:02:56 +10001859
1860static void
1861main_sigchld_handler(int sig)
1862{
1863 int save_errno = errno;
1864 pid_t pid;
1865 int status;
1866
1867 while ((pid = waitpid(-1, &status, WNOHANG)) > 0 ||
1868 (pid < 0 && errno == EINTR))
1869 ;
1870
1871 signal(sig, main_sigchld_handler);
1872 errno = save_errno;
1873}