blob: 97f6e821d229c50a05ae8b489d071e126385eb9e [file] [log] [blame]
djm@openbsd.org957fbce2014-10-08 22:20:25 +00001/* $OpenBSD: ssh.c,v 1.408 2014/10/08 22:20:25 djm Exp $ */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002/*
Damien Miller95def091999-11-25 00:26:21 +11003 * Author: Tatu Ylonen <ylo@cs.hut.fi>
4 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5 * All rights reserved
Damien Miller95def091999-11-25 00:26:21 +11006 * Ssh client program. This program can be used to log into a remote machine.
7 * The software supports strong authentication, encryption, and forwarding
8 * of X11, TCP/IP, and authentication connections.
9 *
Damien Millere4340be2000-09-16 13:29:08 +110010 * As far as I am concerned, the code I have written for this software
11 * can be used freely for any purpose. Any derived versions of this
12 * software must be clearly marked as such, and if the derived work is
13 * incompatible with the protocol description in the RFC file, it must be
14 * called by a name other than "ssh" or "Secure Shell".
15 *
16 * Copyright (c) 1999 Niels Provos. All rights reserved.
Darren Tucker0a118da2003-10-15 15:54:32 +100017 * Copyright (c) 2000, 2001, 2002, 2003 Markus Friedl. All rights reserved.
Damien Millere4340be2000-09-16 13:29:08 +110018 *
19 * Modified to work with SSL by Niels Provos <provos@citi.umich.edu>
20 * in Canada (German citizen).
21 *
22 * Redistribution and use in source and binary forms, with or without
23 * modification, are permitted provided that the following conditions
24 * are met:
25 * 1. Redistributions of source code must retain the above copyright
26 * notice, this list of conditions and the following disclaimer.
27 * 2. Redistributions in binary form must reproduce the above copyright
28 * notice, this list of conditions and the following disclaimer in the
29 * documentation and/or other materials provided with the distribution.
30 *
31 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
32 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
33 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
34 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
35 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
36 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
37 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
38 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
39 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
40 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Damien Miller95def091999-11-25 00:26:21 +110041 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100042
43#include "includes.h"
Damien Millercd4223c2006-03-15 11:22:47 +110044
Damien Millerf17883e2006-03-15 11:45:54 +110045#include <sys/types.h>
46#ifdef HAVE_SYS_STAT_H
47# include <sys/stat.h>
48#endif
Damien Millercd4223c2006-03-15 11:22:47 +110049#include <sys/resource.h>
Damien Miller17e91c02006-03-15 11:28:34 +110050#include <sys/ioctl.h>
Darren Tucker199b1342009-07-06 07:16:56 +100051#include <sys/param.h>
Damien Millere3b60b52006-07-10 21:08:03 +100052#include <sys/socket.h>
Damien Miller857b02e2010-09-24 22:02:56 +100053#include <sys/wait.h>
Damien Miller03e20032006-03-15 11:16:59 +110054
Damien Millerc7b06362006-03-15 11:53:45 +110055#include <ctype.h>
Darren Tuckerba724052006-07-12 22:24:22 +100056#include <errno.h>
Damien Miller57cf6382006-07-10 21:13:46 +100057#include <fcntl.h>
Damien Millerb8fe89c2006-07-24 14:51:00 +100058#include <netdb.h>
Damien Miller6645e7a2006-03-15 14:42:54 +110059#ifdef HAVE_PATHS_H
Damien Miller03e20032006-03-15 11:16:59 +110060#include <paths.h>
Damien Miller6645e7a2006-03-15 14:42:54 +110061#endif
Damien Miller9f2abc42006-07-10 20:53:08 +100062#include <pwd.h>
Damien Miller6ff3cad2006-03-15 11:52:09 +110063#include <signal.h>
Damien Millerded319c2006-09-01 15:38:36 +100064#include <stdarg.h>
Damien Miller2d00e632006-07-24 13:53:19 +100065#include <stddef.h>
Damien Millera7a73ee2006-08-05 11:37:59 +100066#include <stdio.h>
Damien Millere7a1e5c2006-08-05 11:34:19 +100067#include <stdlib.h>
Damien Millere3476ed2006-07-24 14:13:33 +100068#include <string.h>
Damien Millere6b3b612006-07-24 14:01:23 +100069#include <unistd.h>
Damien Millereba71ba2000-04-29 23:57:08 +100070
Darren Tucker46aa3e02006-09-02 15:32:40 +100071#include <netinet/in.h>
72#include <arpa/inet.h>
73
Damien 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"
Damien Miller9c386432014-07-03 21:27:46 +100088#include "digest.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000089#include "packet.h"
90#include "buffer.h"
Ben Lindstromc7637672001-06-09 00:36:26 +000091#include "channels.h"
Damien Millereba71ba2000-04-29 23:57:08 +100092#include "key.h"
Damien Miller994cf142000-07-21 10:19:44 +100093#include "authfd.h"
Damien Millereba71ba2000-04-29 23:57:08 +100094#include "authfile.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000095#include "pathnames.h"
Damien Miller0e220db2004-06-15 10:34:08 +100096#include "dispatch.h"
Ben Lindstrombf555ba2001-01-18 02:04:35 +000097#include "clientloop.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000098#include "log.h"
Damien Miller7acefbb2014-07-18 14:11:24 +100099#include "misc.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +0000100#include "readconf.h"
101#include "sshconnect.h"
Ben Lindstrom06b33aa2001-02-15 03:01:59 +0000102#include "kex.h"
103#include "mac.h"
Darren Tucker06f2bd82004-05-13 16:06:46 +1000104#include "sshpty.h"
Darren Tucker46bc0752004-05-02 22:11:30 +1000105#include "match.h"
Damien Miller0e220db2004-06-15 10:34:08 +1000106#include "msg.h"
Darren Tucker25f60a72004-08-15 17:23:34 +1000107#include "uidswap.h"
Darren Tuckerf1de4e52010-01-08 16:54:59 +1100108#include "roaming.h"
Damien Millerb7576772006-07-10 20:23:39 +1000109#include "version.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000110
Damien Miller7ea845e2010-02-12 09:21:02 +1100111#ifdef ENABLE_PKCS11
112#include "ssh-pkcs11.h"
Ben Lindstrombcc18082001-08-06 21:59:25 +0000113#endif
Ben Lindstromc5b68002001-07-04 04:52:03 +0000114
Damien Miller3f905871999-11-15 17:10:57 +1100115extern char *__progname;
Damien Miller3f905871999-11-15 17:10:57 +1100116
Damien Millerea2c1a42011-06-03 12:10:22 +1000117/* Saves a copy of argv for setproctitle emulation */
118#ifndef HAVE_SETPROCTITLE
119static char **saved_av;
120#endif
121
Darren Tuckerd6173c02008-06-13 04:52:53 +1000122/* Flag indicating whether debug mode is on. May be set on the command line. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000123int debug_flag = 0;
124
Damien Miller21771e22011-05-15 08:45:50 +1000125/* Flag indicating whether a tty should be requested */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000126int tty_flag = 0;
127
Damien Miller1383bd82000-04-06 12:32:37 +1000128/* don't exec a shell */
129int no_shell_flag = 0;
Damien Miller1383bd82000-04-06 12:32:37 +1000130
Damien Miller5428f641999-11-25 11:54:57 +1100131/*
132 * Flag indicating that nothing should be read from stdin. This can be set
133 * on the command line.
134 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000135int stdin_null_flag = 0;
136
Damien Miller5428f641999-11-25 11:54:57 +1100137/*
Damien Millere11e1ea2010-08-03 16:04:46 +1000138 * Flag indicating that the current process should be backgrounded and
139 * a new slave launched in the foreground for ControlPersist.
140 */
141int need_controlpersist_detach = 0;
142
143/* Copies of flags for ControlPersist foreground slave */
Damien Miller21771e22011-05-15 08:45:50 +1000144int ostdin_null_flag, ono_shell_flag, otty_flag, orequest_tty;
Damien Millere11e1ea2010-08-03 16:04:46 +1000145
146/*
Damien Miller5428f641999-11-25 11:54:57 +1100147 * Flag indicating that ssh should fork after authentication. This is useful
Ben Lindstromf666fec2002-06-06 19:51:58 +0000148 * so that the passphrase can be entered manually, and then ssh goes to the
Damien Miller5428f641999-11-25 11:54:57 +1100149 * background.
150 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000151int fork_after_authentication_flag = 0;
152
Darren Tucker7ad8dd22010-01-12 19:40:27 +1100153/* forward stdio to remote host and port */
154char *stdio_forward_host = NULL;
155int stdio_forward_port = 0;
156
Damien Miller5428f641999-11-25 11:54:57 +1100157/*
158 * General data structure for command line options and options configurable
159 * in configuration files. See readconf.h.
160 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000161Options options;
162
Ben Lindstrom14f31ab2001-09-12 17:48:04 +0000163/* optional user configfile */
164char *config = NULL;
165
Damien Miller5428f641999-11-25 11:54:57 +1100166/*
167 * Name of the host we are connecting to. This is the name given on the
168 * command line, or the HostName specified for the user-supplied name in a
169 * configuration file.
170 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000171char *host;
172
173/* socket address the host resolves to */
Damien Miller34132e52000-01-14 15:45:46 +1100174struct sockaddr_storage hostaddr;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000175
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000176/* Private host keys. */
Ben Lindstrom1bad2562002-06-06 19:57:33 +0000177Sensitive sensitive_data;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000178
179/* Original real UID. */
180uid_t original_real_uid;
Ben Lindstromf9c48842002-06-11 16:37:51 +0000181uid_t original_effective_uid;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000182
Damien Miller1383bd82000-04-06 12:32:37 +1000183/* command to be executed */
184Buffer command;
185
Damien Miller832562e2001-01-30 09:30:01 +1100186/* Should we execute a command or invoke a subsystem? */
187int subsystem_flag = 0;
188
Damien Miller2797f7f2002-04-23 21:09:44 +1000189/* # of replies received for global requests */
Darren Tucker9f407c42008-06-13 04:50:27 +1000190static int remote_forward_confirms_received = 0;
Damien Miller2797f7f2002-04-23 21:09:44 +1000191
Damien Millerb1cbfa22008-05-19 16:00:08 +1000192/* mux.c */
193extern int muxserver_sock;
194extern u_int muxclient_command;
Damien Miller0e220db2004-06-15 10:34:08 +1000195
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000196/* Prints a help message to the user. This function never returns. */
197
Ben Lindstrombba81212001-06-25 05:01:22 +0000198static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000199usage(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000200{
Damien Miller50955102004-03-22 09:34:58 +1100201 fprintf(stderr,
Damien Millerc13c3ee2008-11-03 19:23:28 +1100202"usage: ssh [-1246AaCfgKkMNnqsTtVvXxYy] [-b bind_address] [-c cipher_spec]\n"
Damien Miller03d4d7e2013-04-23 15:21:06 +1000203" [-D [bind_address:]port] [-E log_file] [-e escape_char]\n"
204" [-F configfile] [-I pkcs11] [-i identity_file]\n"
Damien Millerd937dc02013-12-05 10:19:54 +1100205" [-L [bind_address:]port:host:hostport] [-l login_name] [-m mac_spec]\n"
Damien Millerbdb352a2013-12-05 10:20:52 +1100206" [-O ctl_cmd] [-o option] [-p port]\n"
207" [-Q cipher | cipher-auth | mac | kex | key]\n"
208" [-R [bind_address:]port:host:hostport] [-S ctl_path] [-W host:port]\n"
209" [-w local_tun[:remote_tun]] [user@]hostname [command]\n"
Damien Miller50955102004-03-22 09:34:58 +1100210 );
Darren Tuckere9a9b712005-12-20 16:15:51 +1100211 exit(255);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000212}
213
Ben Lindstrombba81212001-06-25 05:01:22 +0000214static int ssh_session(void);
215static int ssh_session2(void);
216static void load_public_identity_files(void);
Damien Miller857b02e2010-09-24 22:02:56 +1000217static void main_sigchld_handler(int);
Damien Millerb1cbfa22008-05-19 16:00:08 +1000218
219/* from muxclient.c */
220void muxclient(const char *);
221void muxserver_listen(void);
Damien Miller1383bd82000-04-06 12:32:37 +1000222
Damien Miller295ee632011-05-29 21:42:31 +1000223/* ~/ expand a list of paths. NB. assumes path[n] is heap-allocated. */
224static void
225tilde_expand_paths(char **paths, u_int num_paths)
226{
227 u_int i;
228 char *cp;
229
230 for (i = 0; i < num_paths; i++) {
231 cp = tilde_expand_filename(paths[i], original_real_uid);
Darren Tuckera627d422013-06-02 07:31:17 +1000232 free(paths[i]);
Damien Miller295ee632011-05-29 21:42:31 +1000233 paths[i] = cp;
234 }
235}
236
Damien Miller13f97b22014-02-24 15:57:55 +1100237/*
238 * Attempt to resolve a host name / port to a set of addresses and
239 * optionally return any CNAMEs encountered along the way.
240 * Returns NULL on failure.
241 * NB. this function must operate with a options having undefined members.
242 */
Damien Miller0faf7472013-10-17 11:47:23 +1100243static struct addrinfo *
Damien Miller13f97b22014-02-24 15:57:55 +1100244resolve_host(const char *name, int port, int logerr, char *cname, size_t clen)
Damien Miller0faf7472013-10-17 11:47:23 +1100245{
246 char strport[NI_MAXSERV];
247 struct addrinfo hints, *res;
248 int gaierr, loglevel = SYSLOG_LEVEL_DEBUG1;
249
Damien Miller13f97b22014-02-24 15:57:55 +1100250 if (port <= 0)
251 port = default_ssh_port();
252
Damien Miller0faf7472013-10-17 11:47:23 +1100253 snprintf(strport, sizeof strport, "%u", port);
Damien Miller1d2c4562014-02-04 11:18:20 +1100254 memset(&hints, 0, sizeof(hints));
Damien Miller13f97b22014-02-24 15:57:55 +1100255 hints.ai_family = options.address_family == -1 ?
256 AF_UNSPEC : options.address_family;
Damien Miller0faf7472013-10-17 11:47:23 +1100257 hints.ai_socktype = SOCK_STREAM;
258 if (cname != NULL)
259 hints.ai_flags = AI_CANONNAME;
260 if ((gaierr = getaddrinfo(name, strport, &hints, &res)) != 0) {
261 if (logerr || (gaierr != EAI_NONAME && gaierr != EAI_NODATA))
262 loglevel = SYSLOG_LEVEL_ERROR;
263 do_log2(loglevel, "%s: Could not resolve hostname %.100s: %s",
264 __progname, name, ssh_gai_strerror(gaierr));
265 return NULL;
266 }
267 if (cname != NULL && res->ai_canonname != NULL) {
268 if (strlcpy(cname, res->ai_canonname, clen) >= clen) {
269 error("%s: host \"%s\" cname \"%s\" too long (max %lu)",
270 __func__, name, res->ai_canonname, (u_long)clen);
271 if (clen > 0)
272 *cname = '\0';
273 }
274 }
275 return res;
276}
277
278/*
279 * Check whether the cname is a permitted replacement for the hostname
280 * and perform the replacement if it is.
Damien Miller13f97b22014-02-24 15:57:55 +1100281 * NB. this function must operate with a options having undefined members.
Damien Miller0faf7472013-10-17 11:47:23 +1100282 */
283static int
284check_follow_cname(char **namep, const char *cname)
285{
286 int i;
287 struct allowed_cname *rule;
288
289 if (*cname == '\0' || options.num_permitted_cnames == 0 ||
290 strcmp(*namep, cname) == 0)
291 return 0;
Damien Miller38505592013-10-17 11:48:13 +1100292 if (options.canonicalize_hostname == SSH_CANONICALISE_NO)
Damien Miller0faf7472013-10-17 11:47:23 +1100293 return 0;
294 /*
Damien Miller38505592013-10-17 11:48:13 +1100295 * Don't attempt to canonicalize names that will be interpreted by
Damien Miller0faf7472013-10-17 11:47:23 +1100296 * a proxy unless the user specifically requests so.
297 */
Damien Miller13f97b22014-02-24 15:57:55 +1100298 if (!option_clear_or_none(options.proxy_command) &&
Damien Miller38505592013-10-17 11:48:13 +1100299 options.canonicalize_hostname != SSH_CANONICALISE_ALWAYS)
Damien Miller0faf7472013-10-17 11:47:23 +1100300 return 0;
301 debug3("%s: check \"%s\" CNAME \"%s\"", __func__, *namep, cname);
302 for (i = 0; i < options.num_permitted_cnames; i++) {
303 rule = options.permitted_cnames + i;
304 if (match_pattern_list(*namep, rule->source_list,
305 strlen(rule->source_list), 1) != 1 ||
306 match_pattern_list(cname, rule->target_list,
307 strlen(rule->target_list), 1) != 1)
308 continue;
Damien Miller38505592013-10-17 11:48:13 +1100309 verbose("Canonicalized DNS aliased hostname "
Damien Miller0faf7472013-10-17 11:47:23 +1100310 "\"%s\" => \"%s\"", *namep, cname);
311 free(*namep);
312 *namep = xstrdup(cname);
313 return 1;
314 }
315 return 0;
316}
317
318/*
319 * Attempt to resolve the supplied hostname after applying the user's
Damien Miller51682fa2013-10-17 11:48:31 +1100320 * canonicalization rules. Returns the address list for the host or NULL
321 * if no name was found after canonicalization.
Damien Miller13f97b22014-02-24 15:57:55 +1100322 * NB. this function must operate with a options having undefined members.
Damien Miller0faf7472013-10-17 11:47:23 +1100323 */
324static struct addrinfo *
Damien Miller13f97b22014-02-24 15:57:55 +1100325resolve_canonicalize(char **hostp, int port)
Damien Miller0faf7472013-10-17 11:47:23 +1100326{
327 int i, ndots;
328 char *cp, *fullhost, cname_target[NI_MAXHOST];
329 struct addrinfo *addrs;
330
Damien Miller38505592013-10-17 11:48:13 +1100331 if (options.canonicalize_hostname == SSH_CANONICALISE_NO)
Damien Miller0faf7472013-10-17 11:47:23 +1100332 return NULL;
Damien Miller13f97b22014-02-24 15:57:55 +1100333
Damien Miller0faf7472013-10-17 11:47:23 +1100334 /*
Damien Miller38505592013-10-17 11:48:13 +1100335 * Don't attempt to canonicalize names that will be interpreted by
Damien Miller0faf7472013-10-17 11:47:23 +1100336 * a proxy unless the user specifically requests so.
337 */
Damien Miller13f97b22014-02-24 15:57:55 +1100338 if (!option_clear_or_none(options.proxy_command) &&
Damien Miller38505592013-10-17 11:48:13 +1100339 options.canonicalize_hostname != SSH_CANONICALISE_ALWAYS)
Damien Miller0faf7472013-10-17 11:47:23 +1100340 return NULL;
Damien Miller13f97b22014-02-24 15:57:55 +1100341
Damien Miller51682fa2013-10-17 11:48:31 +1100342 /* Don't apply canonicalization to sufficiently-qualified hostnames */
Damien Miller0faf7472013-10-17 11:47:23 +1100343 ndots = 0;
344 for (cp = *hostp; *cp != '\0'; cp++) {
345 if (*cp == '.')
346 ndots++;
347 }
Damien Miller38505592013-10-17 11:48:13 +1100348 if (ndots > options.canonicalize_max_dots) {
349 debug3("%s: not canonicalizing hostname \"%s\" (max dots %d)",
350 __func__, *hostp, options.canonicalize_max_dots);
Damien Miller0faf7472013-10-17 11:47:23 +1100351 return NULL;
352 }
353 /* Attempt each supplied suffix */
354 for (i = 0; i < options.num_canonical_domains; i++) {
355 *cname_target = '\0';
356 xasprintf(&fullhost, "%s.%s.", *hostp,
357 options.canonical_domains[i]);
Damien Miller13f97b22014-02-24 15:57:55 +1100358 debug3("%s: attempting \"%s\" => \"%s\"", __func__,
359 *hostp, fullhost);
360 if ((addrs = resolve_host(fullhost, port, 0,
Damien Miller0faf7472013-10-17 11:47:23 +1100361 cname_target, sizeof(cname_target))) == NULL) {
362 free(fullhost);
363 continue;
364 }
365 /* Remove trailing '.' */
366 fullhost[strlen(fullhost) - 1] = '\0';
367 /* Follow CNAME if requested */
368 if (!check_follow_cname(&fullhost, cname_target)) {
Damien Miller38505592013-10-17 11:48:13 +1100369 debug("Canonicalized hostname \"%s\" => \"%s\"",
Damien Miller0faf7472013-10-17 11:47:23 +1100370 *hostp, fullhost);
371 }
372 free(*hostp);
373 *hostp = fullhost;
374 return addrs;
375 }
Damien Miller38505592013-10-17 11:48:13 +1100376 if (!options.canonicalize_fallback_local)
Damien Miller13f97b22014-02-24 15:57:55 +1100377 fatal("%s: Could not resolve host \"%s\"", __progname, *hostp);
378 debug2("%s: host %s not found in any suffix", __func__, *hostp);
Damien Miller0faf7472013-10-17 11:47:23 +1100379 return NULL;
380}
381
Damien Miller95def091999-11-25 00:26:21 +1100382/*
Damien Miller13f97b22014-02-24 15:57:55 +1100383 * Read per-user configuration file. Ignore the system wide config
384 * file if the user specifies a config file on the command line.
385 */
386static void
djm@openbsd.org957fbce2014-10-08 22:20:25 +0000387process_config_files(const char *host_arg, struct passwd *pw, int post_canon)
Damien Miller13f97b22014-02-24 15:57:55 +1100388{
389 char buf[MAXPATHLEN];
390 int r;
391
392 if (config != NULL) {
393 if (strcasecmp(config, "none") != 0 &&
djm@openbsd.org957fbce2014-10-08 22:20:25 +0000394 !read_config_file(config, pw, host, host_arg, &options,
395 SSHCONF_USERCONF | (post_canon ? SSHCONF_POSTCANON : 0)))
Damien Miller13f97b22014-02-24 15:57:55 +1100396 fatal("Can't open user config file %.100s: "
397 "%.100s", config, strerror(errno));
398 } else {
399 r = snprintf(buf, sizeof buf, "%s/%s", pw->pw_dir,
400 _PATH_SSH_USER_CONFFILE);
401 if (r > 0 && (size_t)r < sizeof(buf))
djm@openbsd.org957fbce2014-10-08 22:20:25 +0000402 (void)read_config_file(buf, pw, host, host_arg,
403 &options, SSHCONF_CHECKPERM | SSHCONF_USERCONF |
404 (post_canon ? SSHCONF_POSTCANON : 0));
Damien Miller13f97b22014-02-24 15:57:55 +1100405
406 /* Read systemwide configuration file after user config. */
djm@openbsd.org957fbce2014-10-08 22:20:25 +0000407 (void)read_config_file(_PATH_HOST_CONFIG_FILE, pw,
408 host, host_arg, &options,
409 post_canon ? SSHCONF_POSTCANON : 0);
410 }
411}
412
413/* Rewrite the port number in an addrinfo list of addresses */
414static void
415set_addrinfo_port(struct addrinfo *addrs, int port)
416{
417 struct addrinfo *addr;
418
419 for (addr = addrs; addr != NULL; addr = addr->ai_next) {
420 switch (addr->ai_family) {
421 case AF_INET:
422 ((struct sockaddr_in *)addr->ai_addr)->
423 sin_port = htons(port);
424 break;
425 case AF_INET6:
426 ((struct sockaddr_in6 *)addr->ai_addr)->
427 sin6_port = htons(port);
428 break;
429 }
Damien Miller13f97b22014-02-24 15:57:55 +1100430 }
431}
432
433/*
Damien Miller95def091999-11-25 00:26:21 +1100434 * Main program for the ssh client.
435 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000436int
437main(int ac, char **av)
438{
djm@openbsd.org957fbce2014-10-08 22:20:25 +0000439 int i, r, opt, exit_status, use_syslog, config_test = 0;
Damien Miller03d4d7e2013-04-23 15:21:06 +1000440 char *p, *cp, *line, *argv0, buf[MAXPATHLEN], *host_arg, *logfile;
Damien Millerdfc85fa2011-05-15 08:44:02 +1000441 char thishost[NI_MAXHOST], shorthost[NI_MAXHOST], portstr[NI_MAXSERV];
Damien Miller0faf7472013-10-17 11:47:23 +1100442 char cname[NI_MAXHOST];
Damien Miller95def091999-11-25 00:26:21 +1100443 struct stat st;
Ben Lindstrom086cf212001-03-05 05:56:40 +0000444 struct passwd *pw;
Damien Miller194fd902013-10-15 12:13:05 +1100445 int timeout_ms;
Ben Lindstrom5ccf63a2001-09-24 20:00:10 +0000446 extern int optind, optreset;
Damien Miller4f8e6692001-07-14 13:22:53 +1000447 extern char *optarg;
Damien Miller7acefbb2014-07-18 14:11:24 +1000448 struct Forward fwd;
Damien Miller0faf7472013-10-17 11:47:23 +1100449 struct addrinfo *addrs = NULL;
Damien Miller9c386432014-07-03 21:27:46 +1000450 struct ssh_digest_ctx *md;
451 u_char conn_hash[SSH_DIGEST_MAX_LENGTH];
452 char *conn_hash_hex;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000453
Darren Tuckerce321d82005-10-03 18:11:24 +1000454 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
455 sanitise_stdfd();
456
Damien Miller59d3d5b2003-08-22 09:34:41 +1000457 __progname = ssh_get_progname(av[0]);
Damien Millerf9b625c2000-07-09 22:42:32 +1000458
Damien Millerea2c1a42011-06-03 12:10:22 +1000459#ifndef HAVE_SETPROCTITLE
460 /* Prepare for later setproctitle emulation */
461 /* Save argv so it isn't clobbered by setproctitle() emulation */
462 saved_av = xcalloc(ac + 1, sizeof(*saved_av));
463 for (i = 0; i < ac; i++)
464 saved_av[i] = xstrdup(av[i]);
465 saved_av[i] = NULL;
466 compat_init_setproctitle(ac, av);
467 av = saved_av;
468#endif
469
Damien Miller5428f641999-11-25 11:54:57 +1100470 /*
Damien Miller00d9ae22010-08-17 01:59:31 +1000471 * Discard other fds that are hanging around. These can cause problem
472 * with backgrounded ssh processes started by ControlPersist.
473 */
474 closefrom(STDERR_FILENO + 1);
475
476 /*
Damien Miller5428f641999-11-25 11:54:57 +1100477 * Save the original real uid. It will be needed later (uid-swapping
478 * may clobber the real uid).
479 */
Damien Miller95def091999-11-25 00:26:21 +1100480 original_real_uid = getuid();
481 original_effective_uid = geteuid();
Damien Millera8e06ce2003-11-21 23:48:55 +1100482
Damien Miller50b9a602002-09-04 16:50:06 +1000483 /*
484 * Use uid-swapping to give up root privileges for the duration of
485 * option processing. We will re-instantiate the rights when we are
486 * ready to create the privileged port, and will permanently drop
487 * them when the port has been created (actually, when the connection
488 * has been made, as we may need to create the port several times).
489 */
490 PRIV_END;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000491
Damien Miller05dd7952000-10-01 00:42:48 +1100492#ifdef HAVE_SETRLIMIT
Damien Miller95def091999-11-25 00:26:21 +1100493 /* If we are installed setuid root be careful to not drop core. */
494 if (original_real_uid != original_effective_uid) {
495 struct rlimit rlim;
496 rlim.rlim_cur = rlim.rlim_max = 0;
497 if (setrlimit(RLIMIT_CORE, &rlim) < 0)
498 fatal("setrlimit failed: %.100s", strerror(errno));
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000499 }
Damien Millerbac2d8a2000-09-05 16:13:06 +1100500#endif
Ben Lindstrom3fcf1a22001-04-08 18:26:59 +0000501 /* Get user data. */
502 pw = getpwuid(original_real_uid);
503 if (!pw) {
Damien Miller3009d3c2013-07-20 13:22:31 +1000504 logit("No user exists for uid %lu", (u_long)original_real_uid);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100505 exit(255);
Ben Lindstrom3fcf1a22001-04-08 18:26:59 +0000506 }
507 /* Take a copy of the returned structure. */
508 pw = pwcopy(pw);
509
Damien Miller5428f641999-11-25 11:54:57 +1100510 /*
Damien Miller5428f641999-11-25 11:54:57 +1100511 * Set our umask to something reasonable, as some files are created
512 * with the default umask. This will make them world-readable but
513 * writable only by the owner, which is ok for all files for which we
514 * don't set the modes explicitly.
515 */
Damien Miller95def091999-11-25 00:26:21 +1100516 umask(022);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000517
Darren Tuckerd6173c02008-06-13 04:52:53 +1000518 /*
519 * Initialize option structure to indicate that no values have been
520 * set.
521 */
Damien Miller95def091999-11-25 00:26:21 +1100522 initialize_options(&options);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000523
Damien Miller95def091999-11-25 00:26:21 +1100524 /* Parse command-line arguments. */
525 host = NULL;
Damien Millere272a5b2008-11-03 19:22:37 +1100526 use_syslog = 0;
Damien Miller03d4d7e2013-04-23 15:21:06 +1000527 logfile = NULL;
Darren Tucker72efd742009-06-21 17:48:00 +1000528 argv0 = av[0];
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000529
Damien Miller2ecb6bd2006-03-15 12:03:53 +1100530 again:
Darren Tuckerd6173c02008-06-13 04:52:53 +1000531 while ((opt = getopt(ac, av, "1246ab:c:e:fgi:kl:m:no:p:qstvx"
djm@openbsd.org957fbce2014-10-08 22:20:25 +0000532 "ACD:E:F:GI:KL:MNO:PQ:R:S:TVw:W:XYy")) != -1) {
Damien Miller95def091999-11-25 00:26:21 +1100533 switch (opt) {
Ben Lindstrom1e7d3062001-02-09 02:36:43 +0000534 case '1':
535 options.protocol = SSH_PROTO_1;
536 break;
Damien Miller4af51302000-04-16 11:18:38 +1000537 case '2':
538 options.protocol = SSH_PROTO_2;
539 break;
Damien Miller34132e52000-01-14 15:45:46 +1100540 case '4':
Darren Tucker0a4f04b2003-07-03 20:37:47 +1000541 options.address_family = AF_INET;
Damien Miller34132e52000-01-14 15:45:46 +1100542 break;
Damien Miller34132e52000-01-14 15:45:46 +1100543 case '6':
Darren Tucker0a4f04b2003-07-03 20:37:47 +1000544 options.address_family = AF_INET6;
Damien Miller34132e52000-01-14 15:45:46 +1100545 break;
Damien Miller95def091999-11-25 00:26:21 +1100546 case 'n':
547 stdin_null_flag = 1;
548 break;
Damien Miller95def091999-11-25 00:26:21 +1100549 case 'f':
550 fork_after_authentication_flag = 1;
551 stdin_null_flag = 1;
552 break;
Damien Miller95def091999-11-25 00:26:21 +1100553 case 'x':
554 options.forward_x11 = 0;
555 break;
Damien Miller95def091999-11-25 00:26:21 +1100556 case 'X':
557 options.forward_x11 = 1;
558 break;
Damien Millere272a5b2008-11-03 19:22:37 +1100559 case 'y':
560 use_syslog = 1;
561 break;
Damien Miller03d4d7e2013-04-23 15:21:06 +1000562 case 'E':
563 logfile = xstrdup(optarg);
564 break;
djm@openbsd.org957fbce2014-10-08 22:20:25 +0000565 case 'G':
566 config_test = 1;
567 break;
Darren Tucker0a118da2003-10-15 15:54:32 +1000568 case 'Y':
569 options.forward_x11 = 1;
570 options.forward_x11_trusted = 1;
571 break;
Damien Miller95def091999-11-25 00:26:21 +1100572 case 'g':
Damien Miller7acefbb2014-07-18 14:11:24 +1000573 options.fwd_opts.gateway_ports = 1;
Damien Miller95def091999-11-25 00:26:21 +1100574 break;
Darren Tucker7ebfc102004-11-07 20:06:19 +1100575 case 'O':
Damien Millere1537f92010-01-26 13:26:22 +1100576 if (stdio_forward_host != NULL)
577 fatal("Cannot specify multiplexing "
578 "command with -W");
579 else if (muxclient_command != 0)
580 fatal("Multiplexing command already specified");
Darren Tucker7ebfc102004-11-07 20:06:19 +1100581 if (strcmp(optarg, "check") == 0)
Damien Millerb1cbfa22008-05-19 16:00:08 +1000582 muxclient_command = SSHMUX_COMMAND_ALIVE_CHECK;
Damien Miller388f6fc2010-05-21 14:57:35 +1000583 else if (strcmp(optarg, "forward") == 0)
584 muxclient_command = SSHMUX_COMMAND_FORWARD;
Darren Tucker7ebfc102004-11-07 20:06:19 +1100585 else if (strcmp(optarg, "exit") == 0)
Damien Millerb1cbfa22008-05-19 16:00:08 +1000586 muxclient_command = SSHMUX_COMMAND_TERMINATE;
Damien Miller6c3eec72011-05-05 14:16:22 +1000587 else if (strcmp(optarg, "stop") == 0)
588 muxclient_command = SSHMUX_COMMAND_STOP;
Damien Millerf6dff7c2011-09-22 21:38:52 +1000589 else if (strcmp(optarg, "cancel") == 0)
590 muxclient_command = SSHMUX_COMMAND_CANCEL_FWD;
Darren Tucker7ebfc102004-11-07 20:06:19 +1100591 else
592 fatal("Invalid multiplex command.");
593 break;
Damien Miller147bba32002-09-04 16:46:06 +1000594 case 'P': /* deprecated */
Damien Miller95def091999-11-25 00:26:21 +1100595 options.use_privileged_port = 0;
596 break;
Damien Millerd937dc02013-12-05 10:19:54 +1100597 case 'Q':
Damien Millerea111192013-04-23 19:24:32 +1000598 cp = NULL;
Damien Millerd937dc02013-12-05 10:19:54 +1100599 if (strcmp(optarg, "cipher") == 0)
Damien Miller0fde8ac2013-11-21 14:12:23 +1100600 cp = cipher_alg_list('\n', 0);
Damien Millerd937dc02013-12-05 10:19:54 +1100601 else if (strcmp(optarg, "cipher-auth") == 0)
Damien Miller0fde8ac2013-11-21 14:12:23 +1100602 cp = cipher_alg_list('\n', 1);
Damien Millerd937dc02013-12-05 10:19:54 +1100603 else if (strcmp(optarg, "mac") == 0)
Damien Miller690d9892013-11-08 12:16:49 +1100604 cp = mac_alg_list('\n');
Damien Millerd937dc02013-12-05 10:19:54 +1100605 else if (strcmp(optarg, "kex") == 0)
Damien Miller690d9892013-11-08 12:16:49 +1100606 cp = kex_alg_list('\n');
Damien Millerd937dc02013-12-05 10:19:54 +1100607 else if (strcmp(optarg, "key") == 0)
Damien Miller5be9d9e2013-12-07 11:24:01 +1100608 cp = key_alg_list(0, 0);
609 else if (strcmp(optarg, "key-cert") == 0)
610 cp = key_alg_list(1, 0);
611 else if (strcmp(optarg, "key-plain") == 0)
612 cp = key_alg_list(0, 1);
Damien Millerea111192013-04-23 19:24:32 +1000613 if (cp == NULL)
614 fatal("Unsupported query \"%s\"", optarg);
615 printf("%s\n", cp);
616 free(cp);
617 exit(0);
618 break;
Damien Miller95def091999-11-25 00:26:21 +1100619 case 'a':
620 options.forward_agent = 0;
621 break;
Damien Millerb1715dc2000-05-30 13:44:51 +1000622 case 'A':
623 options.forward_agent = 1;
624 break;
Damien Miller95def091999-11-25 00:26:21 +1100625 case 'k':
Damien Millere0113cc2003-11-24 13:10:09 +1100626 options.gss_deleg_creds = 0;
Damien Miller95def091999-11-25 00:26:21 +1100627 break;
Darren Tucker415bddc2007-06-12 23:43:16 +1000628 case 'K':
629 options.gss_authentication = 1;
630 options.gss_deleg_creds = 1;
631 break;
Damien Miller95def091999-11-25 00:26:21 +1100632 case 'i':
633 if (stat(optarg, &st) < 0) {
Damien Millerf4614452001-07-14 12:18:10 +1000634 fprintf(stderr, "Warning: Identity file %s "
Damien Miller3eb48b62005-03-01 21:15:46 +1100635 "not accessible: %s.\n", optarg,
636 strerror(errno));
Damien Miller95def091999-11-25 00:26:21 +1100637 break;
638 }
Darren Tucker19104782013-04-05 11:13:08 +1100639 add_identity_file(&options, NULL, optarg, 1);
Damien Miller95def091999-11-25 00:26:21 +1100640 break;
Ben Lindstromc5b68002001-07-04 04:52:03 +0000641 case 'I':
Damien Miller7ea845e2010-02-12 09:21:02 +1100642#ifdef ENABLE_PKCS11
643 options.pkcs11_provider = xstrdup(optarg);
Ben Lindstrombcc18082001-08-06 21:59:25 +0000644#else
Damien Miller7ea845e2010-02-12 09:21:02 +1100645 fprintf(stderr, "no support for PKCS#11.\n");
Ben Lindstrombcc18082001-08-06 21:59:25 +0000646#endif
Ben Lindstromc5b68002001-07-04 04:52:03 +0000647 break;
Damien Miller95def091999-11-25 00:26:21 +1100648 case 't':
Damien Miller21771e22011-05-15 08:45:50 +1000649 if (options.request_tty == REQUEST_TTY_YES)
650 options.request_tty = REQUEST_TTY_FORCE;
651 else
652 options.request_tty = REQUEST_TTY_YES;
Damien Miller95def091999-11-25 00:26:21 +1100653 break;
Damien Miller95def091999-11-25 00:26:21 +1100654 case 'v':
Darren Tuckere98dfa32003-07-19 19:54:31 +1000655 if (debug_flag == 0) {
Damien Millere4340be2000-09-16 13:29:08 +1100656 debug_flag = 1;
657 options.log_level = SYSLOG_LEVEL_DEBUG1;
Darren Tuckere98dfa32003-07-19 19:54:31 +1000658 } else {
659 if (options.log_level < SYSLOG_LEVEL_DEBUG3)
660 options.log_level++;
Darren Tuckere98dfa32003-07-19 19:54:31 +1000661 }
Damien Miller03d4d7e2013-04-23 15:21:06 +1000662 break;
Damien Miller95def091999-11-25 00:26:21 +1100663 case 'V':
Damien Miller0c889cd2004-03-22 09:36:00 +1100664 fprintf(stderr, "%s, %s\n",
Damien Miller1f0311c2014-05-15 14:24:09 +1000665 SSH_RELEASE,
666#ifdef WITH_OPENSSL
667 SSLeay_version(SSLEAY_VERSION)
668#else
669 "without OpenSSL"
670#endif
671 );
Damien Miller95def091999-11-25 00:26:21 +1100672 if (opt == 'V')
673 exit(0);
Damien Miller95def091999-11-25 00:26:21 +1100674 break;
Damien Millerd27b9472005-12-13 19:29:02 +1100675 case 'w':
Damien Miller7b58e802005-12-13 19:33:19 +1100676 if (options.tun_open == -1)
677 options.tun_open = SSH_TUNMODE_DEFAULT;
Damien Millerd27b9472005-12-13 19:29:02 +1100678 options.tun_local = a2tun(optarg, &options.tun_remote);
Damien Miller7b58e802005-12-13 19:33:19 +1100679 if (options.tun_local == SSH_TUNID_ERR) {
Darren Tuckerd6173c02008-06-13 04:52:53 +1000680 fprintf(stderr,
681 "Bad tun device '%s'\n", optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100682 exit(255);
Damien Millerd27b9472005-12-13 19:29:02 +1100683 }
684 break;
Darren Tucker7ad8dd22010-01-12 19:40:27 +1100685 case 'W':
Damien Millere1537f92010-01-26 13:26:22 +1100686 if (stdio_forward_host != NULL)
687 fatal("stdio forward already specified");
688 if (muxclient_command != 0)
689 fatal("Cannot specify stdio forward with -O");
Darren Tucker7ad8dd22010-01-12 19:40:27 +1100690 if (parse_forward(&fwd, optarg, 1, 0)) {
691 stdio_forward_host = fwd.listen_host;
692 stdio_forward_port = fwd.listen_port;
Darren Tuckera627d422013-06-02 07:31:17 +1000693 free(fwd.connect_host);
Darren Tucker7ad8dd22010-01-12 19:40:27 +1100694 } else {
695 fprintf(stderr,
696 "Bad stdio forwarding specification '%s'\n",
697 optarg);
698 exit(255);
699 }
Damien Miller21771e22011-05-15 08:45:50 +1000700 options.request_tty = REQUEST_TTY_NO;
Darren Tucker7ad8dd22010-01-12 19:40:27 +1100701 no_shell_flag = 1;
702 options.clear_forwardings = 1;
703 options.exit_on_forward_failure = 1;
704 break;
Damien Miller95def091999-11-25 00:26:21 +1100705 case 'q':
706 options.log_level = SYSLOG_LEVEL_QUIET;
707 break;
Damien Miller95def091999-11-25 00:26:21 +1100708 case 'e':
709 if (optarg[0] == '^' && optarg[2] == 0 &&
Damien Millerf4614452001-07-14 12:18:10 +1000710 (u_char) optarg[1] >= 64 &&
711 (u_char) optarg[1] < 128)
Ben Lindstrom46c16222000-12-22 01:43:59 +0000712 options.escape_char = (u_char) optarg[1] & 31;
Damien Miller95def091999-11-25 00:26:21 +1100713 else if (strlen(optarg) == 1)
Ben Lindstrom46c16222000-12-22 01:43:59 +0000714 options.escape_char = (u_char) optarg[0];
Damien Miller95def091999-11-25 00:26:21 +1100715 else if (strcmp(optarg, "none") == 0)
Ben Lindstrom2b1f71b2001-06-05 20:32:21 +0000716 options.escape_char = SSH_ESCAPECHAR_NONE;
Damien Miller95def091999-11-25 00:26:21 +1100717 else {
Damien Millerf4614452001-07-14 12:18:10 +1000718 fprintf(stderr, "Bad escape character '%s'.\n",
719 optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100720 exit(255);
Damien Miller95def091999-11-25 00:26:21 +1100721 }
722 break;
Damien Miller95def091999-11-25 00:26:21 +1100723 case 'c':
Damien Millereba71ba2000-04-29 23:57:08 +1000724 if (ciphers_valid(optarg)) {
725 /* SSH2 only */
726 options.ciphers = xstrdup(optarg);
Darren Tucker5cb30ad2004-08-12 22:40:24 +1000727 options.cipher = SSH_CIPHER_INVALID;
Damien Millereba71ba2000-04-29 23:57:08 +1000728 } else {
729 /* SSH1 only */
Damien Millere39cacc2000-11-29 12:18:44 +1100730 options.cipher = cipher_number(optarg);
731 if (options.cipher == -1) {
Damien Millerf4614452001-07-14 12:18:10 +1000732 fprintf(stderr,
733 "Unknown cipher type '%s'\n",
734 optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100735 exit(255);
Damien Millereba71ba2000-04-29 23:57:08 +1000736 }
Damien Millerf4614452001-07-14 12:18:10 +1000737 if (options.cipher == SSH_CIPHER_3DES)
Damien Millere39cacc2000-11-29 12:18:44 +1100738 options.ciphers = "3des-cbc";
Damien Millerf4614452001-07-14 12:18:10 +1000739 else if (options.cipher == SSH_CIPHER_BLOWFISH)
Damien Millere39cacc2000-11-29 12:18:44 +1100740 options.ciphers = "blowfish-cbc";
Damien Millerf4614452001-07-14 12:18:10 +1000741 else
Damien Millere39cacc2000-11-29 12:18:44 +1100742 options.ciphers = (char *)-1;
Damien Miller95def091999-11-25 00:26:21 +1100743 }
744 break;
Ben Lindstrom06b33aa2001-02-15 03:01:59 +0000745 case 'm':
746 if (mac_valid(optarg))
747 options.macs = xstrdup(optarg);
748 else {
Damien Millerf4614452001-07-14 12:18:10 +1000749 fprintf(stderr, "Unknown mac type '%s'\n",
750 optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100751 exit(255);
Ben Lindstrom06b33aa2001-02-15 03:01:59 +0000752 }
753 break;
Damien Miller0e220db2004-06-15 10:34:08 +1000754 case 'M':
Damien Millerd14b1e72005-06-16 13:19:41 +1000755 if (options.control_master == SSHCTL_MASTER_YES)
756 options.control_master = SSHCTL_MASTER_ASK;
757 else
758 options.control_master = SSHCTL_MASTER_YES;
Damien Miller0e220db2004-06-15 10:34:08 +1000759 break;
Damien Miller95def091999-11-25 00:26:21 +1100760 case 'p':
Ben Lindstrom19066a12001-04-12 23:39:26 +0000761 options.port = a2port(optarg);
Damien Miller3dc71ad2009-01-28 16:31:22 +1100762 if (options.port <= 0) {
Ben Lindstrom146edb92001-04-11 23:06:28 +0000763 fprintf(stderr, "Bad port '%s'\n", optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100764 exit(255);
Ben Lindstrom146edb92001-04-11 23:06:28 +0000765 }
Damien Miller95def091999-11-25 00:26:21 +1100766 break;
Damien Miller95def091999-11-25 00:26:21 +1100767 case 'l':
768 options.user = optarg;
769 break;
Ben Lindstrom1a174712001-09-12 17:56:15 +0000770
Damien Miller95def091999-11-25 00:26:21 +1100771 case 'L':
Damien Miller4bf648f2009-02-14 16:28:21 +1100772 if (parse_forward(&fwd, optarg, 0, 0))
Damien Millerf91ee4c2005-03-01 21:24:33 +1100773 add_local_forward(&options, &fwd);
774 else {
Damien Millerf4614452001-07-14 12:18:10 +1000775 fprintf(stderr,
Damien Millerf91ee4c2005-03-01 21:24:33 +1100776 "Bad local forwarding specification '%s'\n",
Damien Millerf4614452001-07-14 12:18:10 +1000777 optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100778 exit(255);
Ben Lindstrom1a174712001-09-12 17:56:15 +0000779 }
Damien Millerf91ee4c2005-03-01 21:24:33 +1100780 break;
781
782 case 'R':
Damien Miller4bf648f2009-02-14 16:28:21 +1100783 if (parse_forward(&fwd, optarg, 0, 1)) {
Damien Millerf91ee4c2005-03-01 21:24:33 +1100784 add_remote_forward(&options, &fwd);
785 } else {
786 fprintf(stderr,
787 "Bad remote forwarding specification "
788 "'%s'\n", optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100789 exit(255);
Damien Millerf91ee4c2005-03-01 21:24:33 +1100790 }
Damien Miller95def091999-11-25 00:26:21 +1100791 break;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000792
793 case 'D':
Damien Miller4bf648f2009-02-14 16:28:21 +1100794 if (parse_forward(&fwd, optarg, 1, 0)) {
Damien Millera699d952008-11-03 19:27:34 +1100795 add_local_forward(&options, &fwd);
Damien Millerf91ee4c2005-03-01 21:24:33 +1100796 } else {
Damien Millera699d952008-11-03 19:27:34 +1100797 fprintf(stderr,
798 "Bad dynamic forwarding specification "
799 "'%s'\n", optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100800 exit(255);
Ben Lindstrom146edb92001-04-11 23:06:28 +0000801 }
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000802 break;
803
Damien Miller95def091999-11-25 00:26:21 +1100804 case 'C':
805 options.compression = 1;
806 break;
Damien Miller1383bd82000-04-06 12:32:37 +1000807 case 'N':
808 no_shell_flag = 1;
Damien Miller21771e22011-05-15 08:45:50 +1000809 options.request_tty = REQUEST_TTY_NO;
Damien Miller1383bd82000-04-06 12:32:37 +1000810 break;
Damien Miller1383bd82000-04-06 12:32:37 +1000811 case 'T':
Damien Miller21771e22011-05-15 08:45:50 +1000812 options.request_tty = REQUEST_TTY_NO;
Damien Miller1383bd82000-04-06 12:32:37 +1000813 break;
Damien Miller95def091999-11-25 00:26:21 +1100814 case 'o':
Damien Miller9836cf82003-12-17 16:30:06 +1100815 line = xstrdup(optarg);
djm@openbsd.org957fbce2014-10-08 22:20:25 +0000816 if (process_config_line(&options, pw,
817 host ? host : "", host ? host : "", line,
818 "command-line", 0, NULL, SSHCONF_USERCONF) != 0)
Darren Tuckere9a9b712005-12-20 16:15:51 +1100819 exit(255);
Darren Tuckera627d422013-06-02 07:31:17 +1000820 free(line);
Damien Miller95def091999-11-25 00:26:21 +1100821 break;
Damien Miller832562e2001-01-30 09:30:01 +1100822 case 's':
823 subsystem_flag = 1;
824 break;
Damien Miller0e220db2004-06-15 10:34:08 +1000825 case 'S':
826 if (options.control_path != NULL)
827 free(options.control_path);
828 options.control_path = xstrdup(optarg);
Damien Miller0e220db2004-06-15 10:34:08 +1000829 break;
Ben Lindstrome0f88042001-04-30 13:06:24 +0000830 case 'b':
831 options.bind_address = optarg;
832 break;
Ben Lindstrom14f31ab2001-09-12 17:48:04 +0000833 case 'F':
834 config = optarg;
835 break;
Damien Miller95def091999-11-25 00:26:21 +1100836 default:
837 usage();
838 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000839 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000840
Damien Millerf4614452001-07-14 12:18:10 +1000841 ac -= optind;
842 av += optind;
843
Darren Tuckerb8c884a2010-01-08 18:53:43 +1100844 if (ac > 0 && !host) {
Ben Lindstromc276c122002-12-23 02:14:51 +0000845 if (strrchr(*av, '@')) {
Damien Millerf4614452001-07-14 12:18:10 +1000846 p = xstrdup(*av);
Ben Lindstromc276c122002-12-23 02:14:51 +0000847 cp = strrchr(p, '@');
Damien Millerf4614452001-07-14 12:18:10 +1000848 if (cp == NULL || cp == p)
849 usage();
850 options.user = p;
851 *cp = '\0';
Damien Miller0faf7472013-10-17 11:47:23 +1100852 host = xstrdup(++cp);
Damien Millerf4614452001-07-14 12:18:10 +1000853 } else
Damien Miller0faf7472013-10-17 11:47:23 +1100854 host = xstrdup(*av);
Ben Lindstromb9fa6912002-12-23 02:24:54 +0000855 if (ac > 1) {
856 optind = optreset = 1;
Damien Millerf4614452001-07-14 12:18:10 +1000857 goto again;
858 }
Ben Lindstromb9fa6912002-12-23 02:24:54 +0000859 ac--, av++;
Damien Millerf4614452001-07-14 12:18:10 +1000860 }
861
Damien Miller95def091999-11-25 00:26:21 +1100862 /* Check that we got a host name. */
863 if (!host)
864 usage();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000865
Damien Miller0faf7472013-10-17 11:47:23 +1100866 host_arg = xstrdup(host);
867
Damien Miller1f0311c2014-05-15 14:24:09 +1000868#ifdef WITH_OPENSSL
Damien Miller4314c2b2010-09-10 11:12:09 +1000869 OpenSSL_add_all_algorithms();
Damien Miller0bc1bd82000-11-13 22:57:25 +1100870 ERR_load_crypto_strings();
Damien Miller1f0311c2014-05-15 14:24:09 +1000871#endif
Damien Millercb5e44a2000-09-29 12:12:36 +1100872
Damien Miller95def091999-11-25 00:26:21 +1100873 /* Initialize the command to execute on remote host. */
874 buffer_init(&command);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000875
Damien Miller5428f641999-11-25 11:54:57 +1100876 /*
877 * Save the command to execute on the remote host in a buffer. There
878 * is no limit on the length of the command, except by the maximum
879 * packet size. Also sets the tty flag if there is no command.
880 */
Damien Millerf4614452001-07-14 12:18:10 +1000881 if (!ac) {
Damien Miller95def091999-11-25 00:26:21 +1100882 /* No command specified - execute shell on a tty. */
Damien Miller832562e2001-01-30 09:30:01 +1100883 if (subsystem_flag) {
Damien Millerf4614452001-07-14 12:18:10 +1000884 fprintf(stderr,
885 "You must specify a subsystem to invoke.\n");
Damien Miller832562e2001-01-30 09:30:01 +1100886 usage();
887 }
Damien Miller95def091999-11-25 00:26:21 +1100888 } else {
Damien Millerf4614452001-07-14 12:18:10 +1000889 /* A command has been specified. Store it into the buffer. */
890 for (i = 0; i < ac; i++) {
891 if (i)
Damien Miller95def091999-11-25 00:26:21 +1100892 buffer_append(&command, " ", 1);
893 buffer_append(&command, av[i], strlen(av[i]));
894 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000895 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000896
Damien Miller95def091999-11-25 00:26:21 +1100897 /* Cannot fork to background if no command. */
Darren Tuckerd6173c02008-06-13 04:52:53 +1000898 if (fork_after_authentication_flag && buffer_len(&command) == 0 &&
899 !no_shell_flag)
900 fatal("Cannot fork into background without a command "
901 "to execute.");
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000902
Ben Lindstrom8a432f52001-03-05 07:24:46 +0000903 /*
904 * Initialize "log" output. Since we are the client all output
Damien Miller03d4d7e2013-04-23 15:21:06 +1000905 * goes to stderr unless otherwise specified by -y or -E.
Ben Lindstrom8a432f52001-03-05 07:24:46 +0000906 */
Damien Miller03d4d7e2013-04-23 15:21:06 +1000907 if (use_syslog && logfile != NULL)
908 fatal("Can't specify both -y and -E");
909 if (logfile != NULL) {
910 log_redirect_stderr_to(logfile);
Darren Tuckera627d422013-06-02 07:31:17 +1000911 free(logfile);
Damien Miller03d4d7e2013-04-23 15:21:06 +1000912 }
Darren Tucker72efd742009-06-21 17:48:00 +1000913 log_init(argv0,
Darren Tuckerd6173c02008-06-13 04:52:53 +1000914 options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level,
Damien Millere272a5b2008-11-03 19:22:37 +1100915 SYSLOG_FACILITY_USER, !use_syslog);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000916
Damien Miller03d4d7e2013-04-23 15:21:06 +1000917 if (debug_flag)
Damien Miller1f0311c2014-05-15 14:24:09 +1000918 logit("%s, %s", SSH_RELEASE,
919#ifdef WITH_OPENSSL
920 SSLeay_version(SSLEAY_VERSION)
921#else
922 "without OpenSSL"
923#endif
924 );
Damien Miller03d4d7e2013-04-23 15:21:06 +1000925
Damien Miller13f97b22014-02-24 15:57:55 +1100926 /* Parse the configuration files */
djm@openbsd.org957fbce2014-10-08 22:20:25 +0000927 process_config_files(host_arg, pw, 0);
Ben Lindstrom83f07d12001-10-03 17:22:29 +0000928
Damien Miller13f97b22014-02-24 15:57:55 +1100929 /* Hostname canonicalisation needs a few options filled. */
930 fill_default_options_for_canonicalization(&options);
931
932 /* If the user has replaced the hostname then take it into use now */
933 if (options.hostname != NULL) {
934 /* NB. Please keep in sync with readconf.c:match_cfg_line() */
935 cp = percent_expand(options.hostname,
936 "h", host, (char *)NULL);
937 free(host);
938 host = cp;
djm@openbsd.org957fbce2014-10-08 22:20:25 +0000939 free(options.hostname);
940 options.hostname = xstrdup(host);
Damien Miller13f97b22014-02-24 15:57:55 +1100941 }
942
943 /* If canonicalization requested then try to apply it */
944 lowercase(host);
945 if (options.canonicalize_hostname != SSH_CANONICALISE_NO)
946 addrs = resolve_canonicalize(&host, options.port);
947
948 /*
Damien Miller08b57c62014-02-27 10:17:13 +1100949 * If CanonicalizePermittedCNAMEs have been specified but
950 * other canonicalization did not happen (by not being requested
951 * or by failing with fallback) then the hostname may still be changed
952 * as a result of CNAME following.
953 *
954 * Try to resolve the bare hostname name using the system resolver's
955 * usual search rules and then apply the CNAME follow rules.
956 *
957 * Skip the lookup if a ProxyCommand is being used unless the user
958 * has specifically requested canonicalisation for this case via
959 * CanonicalizeHostname=always
Damien Miller13f97b22014-02-24 15:57:55 +1100960 */
Damien Miller08b57c62014-02-27 10:17:13 +1100961 if (addrs == NULL && options.num_permitted_cnames != 0 &&
962 (option_clear_or_none(options.proxy_command) ||
Damien Miller13f97b22014-02-24 15:57:55 +1100963 options.canonicalize_hostname == SSH_CANONICALISE_ALWAYS)) {
Damien Miller19439e92014-07-02 15:28:40 +1000964 if ((addrs = resolve_host(host, options.port,
965 option_clear_or_none(options.proxy_command),
966 cname, sizeof(cname))) == NULL) {
967 /* Don't fatal proxied host names not in the DNS */
968 if (option_clear_or_none(options.proxy_command))
969 cleanup_exit(255); /* logged in resolve_host */
970 } else
971 check_follow_cname(&host, cname);
Damien Miller13f97b22014-02-24 15:57:55 +1100972 }
973
974 /*
djm@openbsd.org957fbce2014-10-08 22:20:25 +0000975 * If canonicalisation is enabled then re-parse the configuration
976 * files as new stanzas may match.
Damien Miller13f97b22014-02-24 15:57:55 +1100977 */
djm@openbsd.org957fbce2014-10-08 22:20:25 +0000978 if (options.canonicalize_hostname != 0) {
979 debug("Re-reading configuration after hostname "
980 "canonicalisation");
981 free(options.hostname);
982 options.hostname = xstrdup(host);
983 process_config_files(host_arg, pw, 1);
984 /*
985 * Address resolution happens early with canonicalisation
986 * enabled and the port number may have changed since, so
987 * reset it in address list
988 */
989 if (addrs != NULL && options.port > 0)
990 set_addrinfo_port(addrs, options.port);
Ben Lindstrom14f31ab2001-09-12 17:48:04 +0000991 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000992
Damien Miller95def091999-11-25 00:26:21 +1100993 /* Fill configuration defaults. */
994 fill_default_options(&options);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000995
Damien Miller13f97b22014-02-24 15:57:55 +1100996 if (options.port == 0)
997 options.port = default_ssh_port();
Darren Tucker0a4f04b2003-07-03 20:37:47 +1000998 channel_set_af(options.address_family);
999
Damien Millere9fc72e2013-10-15 12:14:12 +11001000 /* Tidy and check options */
1001 if (options.host_key_alias != NULL)
1002 lowercase(options.host_key_alias);
1003 if (options.proxy_command != NULL &&
1004 strcmp(options.proxy_command, "-") == 0 &&
1005 options.proxy_use_fdpass)
1006 fatal("ProxyCommand=- and ProxyUseFDPass are incompatible");
Damien Miller0faf7472013-10-17 11:47:23 +11001007#ifndef HAVE_CYGWIN
1008 if (original_effective_uid != 0)
1009 options.use_privileged_port = 0;
1010#endif
Damien Millere9fc72e2013-10-15 12:14:12 +11001011
Damien Miller95def091999-11-25 00:26:21 +11001012 /* reinit */
Darren Tucker72efd742009-06-21 17:48:00 +10001013 log_init(argv0, options.log_level, SYSLOG_FACILITY_USER, !use_syslog);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001014
Damien Millerfff9f092012-07-06 13:45:01 +10001015 if (options.request_tty == REQUEST_TTY_YES ||
1016 options.request_tty == REQUEST_TTY_FORCE)
1017 tty_flag = 1;
1018
1019 /* Allocate a tty by default if no command specified. */
1020 if (buffer_len(&command) == 0)
1021 tty_flag = options.request_tty != REQUEST_TTY_NO;
1022
1023 /* Force no tty */
1024 if (options.request_tty == REQUEST_TTY_NO || muxclient_command != 0)
1025 tty_flag = 0;
1026 /* Do not allocate a tty if stdin is not a tty. */
1027 if ((!isatty(fileno(stdin)) || stdin_null_flag) &&
1028 options.request_tty != REQUEST_TTY_FORCE) {
1029 if (tty_flag)
1030 logit("Pseudo-terminal will not be allocated because "
1031 "stdin is not a terminal.");
1032 tty_flag = 0;
1033 }
1034
Damien Miller60bc5172001-03-19 09:38:15 +11001035 seed_rng();
1036
Damien Miller95def091999-11-25 00:26:21 +11001037 if (options.user == NULL)
1038 options.user = xstrdup(pw->pw_name);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001039
Damien Millerdfc85fa2011-05-15 08:44:02 +10001040 if (gethostname(thishost, sizeof(thishost)) == -1)
1041 fatal("gethostname: %s", strerror(errno));
1042 strlcpy(shorthost, thishost, sizeof(shorthost));
1043 shorthost[strcspn(thishost, ".")] = '\0';
1044 snprintf(portstr, sizeof(portstr), "%d", options.port);
Darren Tuckerf6b01b72008-06-13 04:56:37 +10001045
Damien Miller9c386432014-07-03 21:27:46 +10001046 if ((md = ssh_digest_start(SSH_DIGEST_SHA1)) == NULL ||
1047 ssh_digest_update(md, thishost, strlen(thishost)) < 0 ||
1048 ssh_digest_update(md, host, strlen(host)) < 0 ||
1049 ssh_digest_update(md, portstr, strlen(portstr)) < 0 ||
1050 ssh_digest_update(md, options.user, strlen(options.user)) < 0 ||
1051 ssh_digest_final(md, conn_hash, sizeof(conn_hash)) < 0)
1052 fatal("%s: mux digest failed", __func__);
1053 ssh_digest_free(md);
1054 conn_hash_hex = tohex(conn_hash, ssh_digest_bytes(SSH_DIGEST_SHA1));
1055
Damien Millerdfc85fa2011-05-15 08:44:02 +10001056 if (options.local_command != NULL) {
Darren Tuckerf6b01b72008-06-13 04:56:37 +10001057 debug3("expanding LocalCommand: %s", options.local_command);
1058 cp = options.local_command;
Damien Miller9c386432014-07-03 21:27:46 +10001059 options.local_command = percent_expand(cp,
1060 "C", conn_hash_hex,
1061 "L", shorthost,
1062 "d", pw->pw_dir,
1063 "h", host,
1064 "l", thishost,
1065 "n", host_arg,
1066 "p", portstr,
1067 "r", options.user,
1068 "u", pw->pw_name,
Damien Millerdfc85fa2011-05-15 08:44:02 +10001069 (char *)NULL);
Darren Tuckerf6b01b72008-06-13 04:56:37 +10001070 debug3("expanded LocalCommand: %s", options.local_command);
Darren Tuckera627d422013-06-02 07:31:17 +10001071 free(cp);
Darren Tuckerf6b01b72008-06-13 04:56:37 +10001072 }
1073
Damien Miller0e220db2004-06-15 10:34:08 +10001074 if (options.control_path != NULL) {
Damien Miller6476cad2005-06-16 13:18:34 +10001075 cp = tilde_expand_filename(options.control_path,
1076 original_real_uid);
Darren Tuckera627d422013-06-02 07:31:17 +10001077 free(options.control_path);
Damien Miller9c386432014-07-03 21:27:46 +10001078 options.control_path = percent_expand(cp,
1079 "C", conn_hash_hex,
1080 "L", shorthost,
1081 "h", host,
1082 "l", thishost,
1083 "n", host_arg,
1084 "p", portstr,
1085 "r", options.user,
1086 "u", pw->pw_name,
Damien Millerdfc85fa2011-05-15 08:44:02 +10001087 (char *)NULL);
Darren Tuckera627d422013-06-02 07:31:17 +10001088 free(cp);
Damien Miller0e220db2004-06-15 10:34:08 +10001089 }
Damien Miller9c386432014-07-03 21:27:46 +10001090 free(conn_hash_hex);
1091
djm@openbsd.org957fbce2014-10-08 22:20:25 +00001092 if (config_test) {
1093 dump_client_config(&options, host);
1094 exit(0);
1095 }
1096
Damien Millerb1cbfa22008-05-19 16:00:08 +10001097 if (muxclient_command != 0 && options.control_path == NULL)
Darren Tucker0814d312005-06-01 23:08:51 +10001098 fatal("No ControlPath specified for \"-O\" command");
Damien Millerd14b1e72005-06-16 13:19:41 +10001099 if (options.control_path != NULL)
Damien Millerb1cbfa22008-05-19 16:00:08 +10001100 muxclient(options.control_path);
Damien Miller0e220db2004-06-15 10:34:08 +10001101
Damien Miller08b57c62014-02-27 10:17:13 +11001102 /*
1103 * If hostname canonicalisation was not enabled, then we may not
1104 * have yet resolved the hostname. Do so now.
1105 */
1106 if (addrs == NULL && options.proxy_command == NULL) {
1107 if ((addrs = resolve_host(host, options.port, 1,
1108 cname, sizeof(cname))) == NULL)
1109 cleanup_exit(255); /* resolve_host logs the error */
1110 }
1111
Damien Miller67bd0622007-09-17 12:06:57 +10001112 timeout_ms = options.connection_timeout * 1000;
1113
Kevin Stevesfcec7f82000-12-15 19:55:48 +00001114 /* Open a connection to the remote host. */
Damien Miller0faf7472013-10-17 11:47:23 +11001115 if (ssh_connect(host, addrs, &hostaddr, options.port,
1116 options.address_family, options.connection_attempts,
1117 &timeout_ms, options.tcp_keep_alive,
1118 options.use_privileged_port) != 0)
1119 exit(255);
1120
Damien Miller28631ce2013-10-26 10:07:56 +11001121 if (addrs != NULL)
1122 freeaddrinfo(addrs);
1123
Damien Miller0faf7472013-10-17 11:47:23 +11001124 packet_set_timeout(options.server_alive_interval,
1125 options.server_alive_count_max);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001126
Damien Miller67bd0622007-09-17 12:06:57 +10001127 if (timeout_ms > 0)
1128 debug3("timeout: %d ms remain after connect", timeout_ms);
1129
Damien Miller5428f641999-11-25 11:54:57 +11001130 /*
1131 * If we successfully made the connection, load the host private key
1132 * in case we will need it later for combined rsa-rhosts
1133 * authentication. This must be done before releasing extra
1134 * privileges, because the file is only readable by root.
Ben Lindstrom9e5bb572002-06-06 19:58:27 +00001135 * If we cannot access the private keys, load the public keys
1136 * instead and try to execute the ssh-keysign helper instead.
Damien Miller5428f641999-11-25 11:54:57 +11001137 */
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001138 sensitive_data.nkeys = 0;
1139 sensitive_data.keys = NULL;
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001140 sensitive_data.external_keysign = 0;
Ben Lindstrom24157572002-06-12 16:09:39 +00001141 if (options.rhosts_rsa_authentication ||
1142 options.hostbased_authentication) {
Damien Miller0fa47cf2013-12-29 17:53:39 +11001143 sensitive_data.nkeys = 9;
Damien Millerddd63ab2006-03-31 23:10:51 +11001144 sensitive_data.keys = xcalloc(sensitive_data.nkeys,
Ben Lindstroma962c2f2002-07-04 00:14:17 +00001145 sizeof(Key));
Damien Miller6af914a2010-09-10 11:39:26 +10001146 for (i = 0; i < sensitive_data.nkeys; i++)
1147 sensitive_data.keys[i] = NULL;
Ben Lindstromf9c48842002-06-11 16:37:51 +00001148
1149 PRIV_START;
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001150 sensitive_data.keys[0] = key_load_private_type(KEY_RSA1,
Darren Tucker232b76f2006-05-06 17:41:51 +10001151 _PATH_HOST_KEY_FILE, "", NULL, NULL);
Damien Millerc1583312010-08-05 13:04:50 +10001152 sensitive_data.keys[1] = key_load_private_cert(KEY_DSA,
1153 _PATH_HOST_DSA_KEY_FILE, "", NULL);
Damien Miller6af914a2010-09-10 11:39:26 +10001154#ifdef OPENSSL_HAS_ECC
Damien Millereb8b60e2010-08-31 22:41:14 +10001155 sensitive_data.keys[2] = key_load_private_cert(KEY_ECDSA,
1156 _PATH_HOST_ECDSA_KEY_FILE, "", NULL);
Damien Miller6af914a2010-09-10 11:39:26 +10001157#endif
Damien Millereb8b60e2010-08-31 22:41:14 +10001158 sensitive_data.keys[3] = key_load_private_cert(KEY_RSA,
Damien Millerc1583312010-08-05 13:04:50 +10001159 _PATH_HOST_RSA_KEY_FILE, "", NULL);
Damien Miller0fa47cf2013-12-29 17:53:39 +11001160 sensitive_data.keys[4] = key_load_private_cert(KEY_ED25519,
1161 _PATH_HOST_ED25519_KEY_FILE, "", NULL);
1162 sensitive_data.keys[5] = key_load_private_type(KEY_DSA,
Darren Tucker232b76f2006-05-06 17:41:51 +10001163 _PATH_HOST_DSA_KEY_FILE, "", NULL, NULL);
Damien Miller6af914a2010-09-10 11:39:26 +10001164#ifdef OPENSSL_HAS_ECC
Damien Miller0fa47cf2013-12-29 17:53:39 +11001165 sensitive_data.keys[6] = key_load_private_type(KEY_ECDSA,
Damien Millereb8b60e2010-08-31 22:41:14 +10001166 _PATH_HOST_ECDSA_KEY_FILE, "", NULL, NULL);
Damien Miller6af914a2010-09-10 11:39:26 +10001167#endif
Damien Miller0fa47cf2013-12-29 17:53:39 +11001168 sensitive_data.keys[7] = key_load_private_type(KEY_RSA,
Darren Tucker232b76f2006-05-06 17:41:51 +10001169 _PATH_HOST_RSA_KEY_FILE, "", NULL, NULL);
Damien Miller0fa47cf2013-12-29 17:53:39 +11001170 sensitive_data.keys[8] = key_load_private_type(KEY_ED25519,
Damien Miller5be9d9e2013-12-07 11:24:01 +11001171 _PATH_HOST_ED25519_KEY_FILE, "", NULL, NULL);
Ben Lindstromf9c48842002-06-11 16:37:51 +00001172 PRIV_END;
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001173
Ben Lindstrom5d35a2f2002-07-04 00:19:40 +00001174 if (options.hostbased_authentication == 1 &&
1175 sensitive_data.keys[0] == NULL &&
Damien Millereb8b60e2010-08-31 22:41:14 +10001176 sensitive_data.keys[5] == NULL &&
Damien Miller5be9d9e2013-12-07 11:24:01 +11001177 sensitive_data.keys[6] == NULL &&
Damien Miller0fa47cf2013-12-29 17:53:39 +11001178 sensitive_data.keys[7] == NULL &&
1179 sensitive_data.keys[8] == NULL) {
Damien Millerc1583312010-08-05 13:04:50 +10001180 sensitive_data.keys[1] = key_load_cert(
1181 _PATH_HOST_DSA_KEY_FILE);
Damien Miller6af914a2010-09-10 11:39:26 +10001182#ifdef OPENSSL_HAS_ECC
Damien Millerc1583312010-08-05 13:04:50 +10001183 sensitive_data.keys[2] = key_load_cert(
Damien Millereb8b60e2010-08-31 22:41:14 +10001184 _PATH_HOST_ECDSA_KEY_FILE);
Damien Miller6af914a2010-09-10 11:39:26 +10001185#endif
Damien Millereb8b60e2010-08-31 22:41:14 +10001186 sensitive_data.keys[3] = key_load_cert(
Damien Millerc1583312010-08-05 13:04:50 +10001187 _PATH_HOST_RSA_KEY_FILE);
Damien Miller0fa47cf2013-12-29 17:53:39 +11001188 sensitive_data.keys[4] = key_load_cert(
1189 _PATH_HOST_ED25519_KEY_FILE);
1190 sensitive_data.keys[5] = key_load_public(
Damien Millereb8b60e2010-08-31 22:41:14 +10001191 _PATH_HOST_DSA_KEY_FILE, NULL);
Damien Miller6af914a2010-09-10 11:39:26 +10001192#ifdef OPENSSL_HAS_ECC
Damien Miller0fa47cf2013-12-29 17:53:39 +11001193 sensitive_data.keys[6] = key_load_public(
Damien Millereb8b60e2010-08-31 22:41:14 +10001194 _PATH_HOST_ECDSA_KEY_FILE, NULL);
Damien Miller6af914a2010-09-10 11:39:26 +10001195#endif
Damien Miller5be9d9e2013-12-07 11:24:01 +11001196 sensitive_data.keys[7] = key_load_public(
Damien Miller0fa47cf2013-12-29 17:53:39 +11001197 _PATH_HOST_RSA_KEY_FILE, NULL);
1198 sensitive_data.keys[8] = key_load_public(
Damien Miller5be9d9e2013-12-07 11:24:01 +11001199 _PATH_HOST_ED25519_KEY_FILE, NULL);
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001200 sensitive_data.external_keysign = 1;
1201 }
Damien Miller95def091999-11-25 00:26:21 +11001202 }
Damien Miller5428f641999-11-25 11:54:57 +11001203 /*
1204 * Get rid of any extra privileges that we may have. We will no
1205 * longer need them. Also, extra privileges could make it very hard
1206 * to read identity files and other non-world-readable files from the
1207 * user's home directory if it happens to be on a NFS volume where
1208 * root is mapped to nobody.
1209 */
Darren Tucker25f60a72004-08-15 17:23:34 +10001210 if (original_effective_uid == 0) {
1211 PRIV_START;
1212 permanently_set_uid(pw);
1213 }
Damien Miller95def091999-11-25 00:26:21 +11001214
Damien Miller5428f641999-11-25 11:54:57 +11001215 /*
1216 * Now that we are back to our own permissions, create ~/.ssh
Damien Miller788f2122005-11-05 15:14:59 +11001217 * directory if it doesn't already exist.
Damien Miller5428f641999-11-25 11:54:57 +11001218 */
Darren Tucker45c66d72011-11-04 10:50:40 +11001219 if (config == NULL) {
1220 r = snprintf(buf, sizeof buf, "%s%s%s", pw->pw_dir,
1221 strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR);
1222 if (r > 0 && (size_t)r < sizeof(buf) && stat(buf, &st) < 0) {
Darren Tucker8ccb7392010-09-10 12:28:24 +10001223#ifdef WITH_SELINUX
Darren Tucker45c66d72011-11-04 10:50:40 +11001224 ssh_selinux_setfscreatecon(buf);
Darren Tucker8ccb7392010-09-10 12:28:24 +10001225#endif
Darren Tucker45c66d72011-11-04 10:50:40 +11001226 if (mkdir(buf, 0700) < 0)
1227 error("Could not create directory '%.200s'.",
1228 buf);
Darren Tucker8ccb7392010-09-10 12:28:24 +10001229#ifdef WITH_SELINUX
Darren Tucker45c66d72011-11-04 10:50:40 +11001230 ssh_selinux_setfscreatecon(NULL);
Darren Tucker8ccb7392010-09-10 12:28:24 +10001231#endif
Darren Tucker45c66d72011-11-04 10:50:40 +11001232 }
Darren Tucker8ccb7392010-09-10 12:28:24 +10001233 }
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001234 /* load options.identity_files */
1235 load_public_identity_files();
1236
1237 /* Expand ~ in known host file names. */
Damien Miller295ee632011-05-29 21:42:31 +10001238 tilde_expand_paths(options.system_hostfiles,
1239 options.num_system_hostfiles);
1240 tilde_expand_paths(options.user_hostfiles, options.num_user_hostfiles);
Damien Miller95def091999-11-25 00:26:21 +11001241
Damien Miller07cd5892001-11-12 10:52:03 +11001242 signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
Damien Miller857b02e2010-09-24 22:02:56 +10001243 signal(SIGCHLD, main_sigchld_handler);
Damien Miller07cd5892001-11-12 10:52:03 +11001244
Darren Tuckerd6173c02008-06-13 04:52:53 +10001245 /* Log into the remote system. Never returns if the login fails. */
Damien Miller67bd0622007-09-17 12:06:57 +10001246 ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr,
Damien Millerd925dcd2010-12-01 12:21:51 +11001247 options.port, pw, timeout_ms);
Damien Miller95def091999-11-25 00:26:21 +11001248
Damien Miller383ffe62010-06-26 10:02:03 +10001249 if (packet_connection_is_on_socket()) {
1250 verbose("Authenticated to %s ([%s]:%d).", host,
1251 get_remote_ipaddr(), get_remote_port());
1252 } else {
1253 verbose("Authenticated to %s (via proxy).", host);
1254 }
1255
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001256 /* We no longer need the private host keys. Clear them now. */
1257 if (sensitive_data.nkeys != 0) {
1258 for (i = 0; i < sensitive_data.nkeys; i++) {
1259 if (sensitive_data.keys[i] != NULL) {
1260 /* Destroys contents safely */
1261 debug3("clear hostkey %d", i);
1262 key_free(sensitive_data.keys[i]);
1263 sensitive_data.keys[i] = NULL;
1264 }
1265 }
Darren Tuckera627d422013-06-02 07:31:17 +10001266 free(sensitive_data.keys);
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001267 }
Ben Lindstroma6c8a8d2001-08-06 21:42:00 +00001268 for (i = 0; i < options.num_identity_files; i++) {
Darren Tuckera627d422013-06-02 07:31:17 +10001269 free(options.identity_files[i]);
1270 options.identity_files[i] = NULL;
Ben Lindstroma6c8a8d2001-08-06 21:42:00 +00001271 if (options.identity_keys[i]) {
1272 key_free(options.identity_keys[i]);
1273 options.identity_keys[i] = NULL;
1274 }
1275 }
Damien Miller95def091999-11-25 00:26:21 +11001276
Damien Miller1383bd82000-04-06 12:32:37 +10001277 exit_status = compat20 ? ssh_session2() : ssh_session();
1278 packet_close();
Damien Miller8c4e18a2002-09-19 12:05:02 +10001279
Damien Millerb1cbfa22008-05-19 16:00:08 +10001280 if (options.control_path != NULL && muxserver_sock != -1)
Damien Miller0e220db2004-06-15 10:34:08 +10001281 unlink(options.control_path);
1282
Damien Millera41ccca2010-10-07 22:07:32 +11001283 /* Kill ProxyCommand if it is running. */
1284 ssh_kill_proxy_command();
Damien Miller8c4e18a2002-09-19 12:05:02 +10001285
Damien Miller1383bd82000-04-06 12:32:37 +10001286 return exit_status;
1287}
1288
Damien Millere11e1ea2010-08-03 16:04:46 +10001289static void
1290control_persist_detach(void)
1291{
1292 pid_t pid;
Damien Miller00d9ae22010-08-17 01:59:31 +10001293 int devnull;
Damien Millere11e1ea2010-08-03 16:04:46 +10001294
1295 debug("%s: backgrounding master process", __func__);
1296
1297 /*
1298 * master (current process) into the background, and make the
1299 * foreground process a client of the backgrounded master.
1300 */
1301 switch ((pid = fork())) {
1302 case -1:
1303 fatal("%s: fork: %s", __func__, strerror(errno));
1304 case 0:
1305 /* Child: master process continues mainloop */
1306 break;
1307 default:
1308 /* Parent: set up mux slave to connect to backgrounded master */
1309 debug2("%s: background process is %ld", __func__, (long)pid);
1310 stdin_null_flag = ostdin_null_flag;
Damien Miller21771e22011-05-15 08:45:50 +10001311 options.request_tty = orequest_tty;
Damien Millere11e1ea2010-08-03 16:04:46 +10001312 tty_flag = otty_flag;
1313 close(muxserver_sock);
1314 muxserver_sock = -1;
Damien Miller5929c522010-09-10 11:17:02 +10001315 options.control_master = SSHCTL_MASTER_NO;
Damien Millere11e1ea2010-08-03 16:04:46 +10001316 muxclient(options.control_path);
1317 /* muxclient() doesn't return on success. */
1318 fatal("Failed to connect to new control master");
1319 }
Damien Miller00d9ae22010-08-17 01:59:31 +10001320 if ((devnull = open(_PATH_DEVNULL, O_RDWR)) == -1) {
1321 error("%s: open(\"/dev/null\"): %s", __func__,
1322 strerror(errno));
1323 } else {
1324 if (dup2(devnull, STDIN_FILENO) == -1 ||
1325 dup2(devnull, STDOUT_FILENO) == -1)
1326 error("%s: dup2: %s", __func__, strerror(errno));
1327 if (devnull > STDERR_FILENO)
1328 close(devnull);
1329 }
Damien Miller98e27dc2013-07-25 11:55:52 +10001330 daemon(1, 1);
Damien Millerea2c1a42011-06-03 12:10:22 +10001331 setproctitle("%s [mux]", options.control_path);
Damien Millere11e1ea2010-08-03 16:04:46 +10001332}
1333
1334/* Do fork() after authentication. Used by "ssh -f" */
1335static void
1336fork_postauth(void)
1337{
1338 if (need_controlpersist_detach)
1339 control_persist_detach();
1340 debug("forking to background");
1341 fork_after_authentication_flag = 0;
1342 if (daemon(1, 1) < 0)
1343 fatal("daemon() failed: %.200s", strerror(errno));
1344}
1345
Darren Tucker9f407c42008-06-13 04:50:27 +10001346/* Callback for remote forward global requests */
1347static void
1348ssh_confirm_remote_forward(int type, u_int32_t seq, void *ctxt)
1349{
Damien Miller7acefbb2014-07-18 14:11:24 +10001350 struct Forward *rfwd = (struct Forward *)ctxt;
Darren Tucker9f407c42008-06-13 04:50:27 +10001351
Damien Miller4bf648f2009-02-14 16:28:21 +11001352 /* XXX verbose() on failure? */
Damien Miller4b3ed642014-07-02 15:29:40 +10001353 debug("remote forward %s for: listen %s%s%d, connect %s:%d",
Darren Tucker9f407c42008-06-13 04:50:27 +10001354 type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
Damien Miller7acefbb2014-07-18 14:11:24 +10001355 rfwd->listen_path ? rfwd->listen_path :
1356 rfwd->listen_host ? rfwd->listen_host : "",
1357 (rfwd->listen_path || rfwd->listen_host) ? ":" : "",
1358 rfwd->listen_port, rfwd->connect_path ? rfwd->connect_path :
1359 rfwd->connect_host, rfwd->connect_port);
1360 if (rfwd->listen_path == NULL && rfwd->listen_port == 0) {
Darren Tucker68afb8c2011-10-02 18:59:03 +11001361 if (type == SSH2_MSG_REQUEST_SUCCESS) {
1362 rfwd->allocated_port = packet_get_int();
1363 logit("Allocated port %u for remote forward to %s:%d",
1364 rfwd->allocated_port,
1365 rfwd->connect_host, rfwd->connect_port);
1366 channel_update_permitted_opens(rfwd->handle,
1367 rfwd->allocated_port);
1368 } else {
1369 channel_update_permitted_opens(rfwd->handle, -1);
1370 }
Damien Miller4bf648f2009-02-14 16:28:21 +11001371 }
1372
Darren Tucker9f407c42008-06-13 04:50:27 +10001373 if (type == SSH2_MSG_REQUEST_FAILURE) {
Damien Miller7acefbb2014-07-18 14:11:24 +10001374 if (options.exit_on_forward_failure) {
1375 if (rfwd->listen_path != NULL)
1376 fatal("Error: remote port forwarding failed "
1377 "for listen path %s", rfwd->listen_path);
1378 else
1379 fatal("Error: remote port forwarding failed "
1380 "for listen port %d", rfwd->listen_port);
1381 } else {
1382 if (rfwd->listen_path != NULL)
1383 logit("Warning: remote port forwarding failed "
1384 "for listen path %s", rfwd->listen_path);
1385 else
1386 logit("Warning: remote port forwarding failed "
1387 "for listen port %d", rfwd->listen_port);
1388 }
Darren Tucker9f407c42008-06-13 04:50:27 +10001389 }
Darren Tucker9a2a6092008-07-04 12:53:50 +10001390 if (++remote_forward_confirms_received == options.num_remote_forwards) {
Darren Tucker9f407c42008-06-13 04:50:27 +10001391 debug("All remote forwarding requests processed");
Damien Millere11e1ea2010-08-03 16:04:46 +10001392 if (fork_after_authentication_flag)
1393 fork_postauth();
Darren Tucker9a2a6092008-07-04 12:53:50 +10001394 }
Darren Tucker9f407c42008-06-13 04:50:27 +10001395}
1396
Ben Lindstrombba81212001-06-25 05:01:22 +00001397static void
Darren Tucker7ad8dd22010-01-12 19:40:27 +11001398client_cleanup_stdio_fwd(int id, void *arg)
1399{
1400 debug("stdio forwarding: done");
1401 cleanup_exit(0);
1402}
1403
Darren Tucker2d6665d2011-11-04 10:54:22 +11001404static void
Damien Miller357610d2014-07-18 15:04:10 +10001405ssh_stdio_confirm(int id, int success, void *arg)
1406{
1407 if (!success)
1408 fatal("stdio forwarding failed");
1409}
1410
1411static void
Darren Tucker2d6665d2011-11-04 10:54:22 +11001412ssh_init_stdio_forwarding(void)
Darren Tucker7ad8dd22010-01-12 19:40:27 +11001413{
1414 Channel *c;
Damien Millere1537f92010-01-26 13:26:22 +11001415 int in, out;
Darren Tucker7ad8dd22010-01-12 19:40:27 +11001416
Darren Tucker2d6665d2011-11-04 10:54:22 +11001417 if (stdio_forward_host == NULL)
1418 return;
Damien Miller386feab2013-10-15 12:14:49 +11001419 if (!compat20)
Darren Tucker2d6665d2011-11-04 10:54:22 +11001420 fatal("stdio forwarding require Protocol 2");
Damien Millere1537f92010-01-26 13:26:22 +11001421
Darren Tucker2d6665d2011-11-04 10:54:22 +11001422 debug3("%s: %s:%d", __func__, stdio_forward_host, stdio_forward_port);
1423
1424 if ((in = dup(STDIN_FILENO)) < 0 ||
1425 (out = dup(STDOUT_FILENO)) < 0)
Damien Millere1537f92010-01-26 13:26:22 +11001426 fatal("channel_connect_stdio_fwd: dup() in/out failed");
Darren Tucker2d6665d2011-11-04 10:54:22 +11001427 if ((c = channel_connect_stdio_fwd(stdio_forward_host,
1428 stdio_forward_port, in, out)) == NULL)
1429 fatal("%s: channel_connect_stdio_fwd failed", __func__);
Darren Tucker7ad8dd22010-01-12 19:40:27 +11001430 channel_register_cleanup(c->self, client_cleanup_stdio_fwd, 0);
Damien Miller357610d2014-07-18 15:04:10 +10001431 channel_register_open_confirm(c->self, ssh_stdio_confirm, NULL);
Darren Tucker7ad8dd22010-01-12 19:40:27 +11001432}
1433
1434static void
Damien Miller0bc1bd82000-11-13 22:57:25 +11001435ssh_init_forwarding(void)
1436{
Kevin Steves12057502001-02-05 14:54:34 +00001437 int success = 0;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001438 int i;
Kevin Steves12057502001-02-05 14:54:34 +00001439
Damien Miller0bc1bd82000-11-13 22:57:25 +11001440 /* Initiate local TCP/IP port forwardings. */
1441 for (i = 0; i < options.num_local_forwards; i++) {
Damien Millerf91ee4c2005-03-01 21:24:33 +11001442 debug("Local connections to %.200s:%d forwarded to remote "
1443 "address %.200s:%d",
Damien Miller7acefbb2014-07-18 14:11:24 +10001444 (options.local_forwards[i].listen_path != NULL) ?
1445 options.local_forwards[i].listen_path :
Darren Tucker47eede72005-03-14 23:08:12 +11001446 (options.local_forwards[i].listen_host == NULL) ?
Damien Miller7acefbb2014-07-18 14:11:24 +10001447 (options.fwd_opts.gateway_ports ? "*" : "LOCALHOST") :
Damien Millerf91ee4c2005-03-01 21:24:33 +11001448 options.local_forwards[i].listen_host,
1449 options.local_forwards[i].listen_port,
Damien Miller7acefbb2014-07-18 14:11:24 +10001450 (options.local_forwards[i].connect_path != NULL) ?
1451 options.local_forwards[i].connect_path :
Damien Millerf91ee4c2005-03-01 21:24:33 +11001452 options.local_forwards[i].connect_host,
1453 options.local_forwards[i].connect_port);
Damien Millerb16461c2002-01-22 23:29:22 +11001454 success += channel_setup_local_fwd_listener(
Damien Miller7acefbb2014-07-18 14:11:24 +10001455 &options.local_forwards[i], &options.fwd_opts);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001456 }
Darren Tuckere7d4b192006-07-12 22:17:10 +10001457 if (i > 0 && success != i && options.exit_on_forward_failure)
1458 fatal("Could not request local forwarding.");
Kevin Steves12057502001-02-05 14:54:34 +00001459 if (i > 0 && success == 0)
1460 error("Could not request local forwarding.");
Damien Miller0bc1bd82000-11-13 22:57:25 +11001461
1462 /* Initiate remote TCP/IP port forwardings. */
1463 for (i = 0; i < options.num_remote_forwards; i++) {
Damien Millerf91ee4c2005-03-01 21:24:33 +11001464 debug("Remote connections from %.200s:%d forwarded to "
1465 "local address %.200s:%d",
Damien Miller7acefbb2014-07-18 14:11:24 +10001466 (options.remote_forwards[i].listen_path != NULL) ?
1467 options.remote_forwards[i].listen_path :
Damien Miller46d38de2005-07-17 17:02:09 +10001468 (options.remote_forwards[i].listen_host == NULL) ?
Damien Milleraa3bb102005-11-05 15:12:59 +11001469 "LOCALHOST" : options.remote_forwards[i].listen_host,
Damien Millerf91ee4c2005-03-01 21:24:33 +11001470 options.remote_forwards[i].listen_port,
Damien Miller7acefbb2014-07-18 14:11:24 +10001471 (options.remote_forwards[i].connect_path != NULL) ?
1472 options.remote_forwards[i].connect_path :
Damien Millerf91ee4c2005-03-01 21:24:33 +11001473 options.remote_forwards[i].connect_host,
1474 options.remote_forwards[i].connect_port);
Darren Tucker68afb8c2011-10-02 18:59:03 +11001475 options.remote_forwards[i].handle =
1476 channel_request_remote_forwarding(
Damien Miller7acefbb2014-07-18 14:11:24 +10001477 &options.remote_forwards[i]);
Darren Tucker68afb8c2011-10-02 18:59:03 +11001478 if (options.remote_forwards[i].handle < 0) {
Darren Tuckere7d4b192006-07-12 22:17:10 +10001479 if (options.exit_on_forward_failure)
1480 fatal("Could not request remote forwarding.");
1481 else
1482 logit("Warning: Could not request remote "
1483 "forwarding.");
Darren Tucker68afb8c2011-10-02 18:59:03 +11001484 } else {
1485 client_register_global_confirm(ssh_confirm_remote_forward,
1486 &options.remote_forwards[i]);
Darren Tuckere7d4b192006-07-12 22:17:10 +10001487 }
Damien Miller0bc1bd82000-11-13 22:57:25 +11001488 }
Damien Millerb3ce9fe2007-08-08 14:32:41 +10001489
1490 /* Initiate tunnel forwarding. */
1491 if (options.tun_open != SSH_TUNMODE_NO) {
1492 if (client_request_tun_fwd(options.tun_open,
1493 options.tun_local, options.tun_remote) == -1) {
1494 if (options.exit_on_forward_failure)
1495 fatal("Could not request tunnel forwarding.");
1496 else
1497 error("Could not request tunnel forwarding.");
1498 }
1499 }
Damien Miller0bc1bd82000-11-13 22:57:25 +11001500}
1501
Ben Lindstrombba81212001-06-25 05:01:22 +00001502static void
Damien Miller0bc1bd82000-11-13 22:57:25 +11001503check_agent_present(void)
1504{
1505 if (options.forward_agent) {
Damien Miller788f2122005-11-05 15:14:59 +11001506 /* Clear agent forwarding if we don't have an agent. */
Damien Miller789e95d2002-09-12 09:52:46 +10001507 if (!ssh_agent_present())
Damien Miller0bc1bd82000-11-13 22:57:25 +11001508 options.forward_agent = 0;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001509 }
1510}
1511
Ben Lindstrombba81212001-06-25 05:01:22 +00001512static int
Damien Miller1383bd82000-04-06 12:32:37 +10001513ssh_session(void)
1514{
1515 int type;
Damien Miller1383bd82000-04-06 12:32:37 +10001516 int interactive = 0;
1517 int have_tty = 0;
1518 struct winsize ws;
Damien Miller1383bd82000-04-06 12:32:37 +10001519 char *cp;
Damien Miller17e7ed02005-06-17 12:54:33 +10001520 const char *display;
Damien Miller1383bd82000-04-06 12:32:37 +10001521
Damien Miller95def091999-11-25 00:26:21 +11001522 /* Enable compression if requested. */
1523 if (options.compression) {
Darren Tuckerd6173c02008-06-13 04:52:53 +10001524 debug("Requesting compression at level %d.",
1525 options.compression_level);
Damien Miller95def091999-11-25 00:26:21 +11001526
Darren Tuckerd6173c02008-06-13 04:52:53 +10001527 if (options.compression_level < 1 ||
1528 options.compression_level > 9)
1529 fatal("Compression level must be from 1 (fast) to "
1530 "9 (slow, best).");
Damien Miller95def091999-11-25 00:26:21 +11001531
1532 /* Send the request. */
1533 packet_start(SSH_CMSG_REQUEST_COMPRESSION);
1534 packet_put_int(options.compression_level);
1535 packet_send();
1536 packet_write_wait();
Damien Millerdff50992002-01-22 23:16:32 +11001537 type = packet_read();
Damien Miller95def091999-11-25 00:26:21 +11001538 if (type == SSH_SMSG_SUCCESS)
1539 packet_start_compression(options.compression_level);
1540 else if (type == SSH_SMSG_FAILURE)
Damien Miller996acd22003-04-09 20:59:48 +10001541 logit("Warning: Remote host refused compression.");
Damien Miller95def091999-11-25 00:26:21 +11001542 else
Darren Tuckerd6173c02008-06-13 04:52:53 +10001543 packet_disconnect("Protocol error waiting for "
1544 "compression response.");
Damien Miller95def091999-11-25 00:26:21 +11001545 }
1546 /* Allocate a pseudo tty if appropriate. */
1547 if (tty_flag) {
1548 debug("Requesting pty.");
1549
1550 /* Start the packet. */
1551 packet_start(SSH_CMSG_REQUEST_PTY);
1552
1553 /* Store TERM in the packet. There is no limit on the
1554 length of the string. */
1555 cp = getenv("TERM");
1556 if (!cp)
1557 cp = "";
Ben Lindstrom664408d2001-06-09 01:42:01 +00001558 packet_put_cstring(cp);
Damien Miller95def091999-11-25 00:26:21 +11001559
1560 /* Store window size in the packet. */
1561 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
1562 memset(&ws, 0, sizeof(ws));
Damien Miller71a73672006-03-26 14:04:36 +11001563 packet_put_int((u_int)ws.ws_row);
1564 packet_put_int((u_int)ws.ws_col);
1565 packet_put_int((u_int)ws.ws_xpixel);
1566 packet_put_int((u_int)ws.ws_ypixel);
Damien Miller95def091999-11-25 00:26:21 +11001567
1568 /* Store tty modes in the packet. */
Ben Lindstromae8e2d32001-04-14 23:13:02 +00001569 tty_make_modes(fileno(stdin), NULL);
Damien Miller95def091999-11-25 00:26:21 +11001570
1571 /* Send the packet, and wait for it to leave. */
1572 packet_send();
1573 packet_write_wait();
1574
1575 /* Read response from the server. */
Damien Millerdff50992002-01-22 23:16:32 +11001576 type = packet_read();
Damien Miller450a7a12000-03-26 13:04:51 +10001577 if (type == SSH_SMSG_SUCCESS) {
Damien Miller95def091999-11-25 00:26:21 +11001578 interactive = 1;
Damien Miller1383bd82000-04-06 12:32:37 +10001579 have_tty = 1;
Damien Miller450a7a12000-03-26 13:04:51 +10001580 } else if (type == SSH_SMSG_FAILURE)
Darren Tuckerd6173c02008-06-13 04:52:53 +10001581 logit("Warning: Remote host failed or refused to "
1582 "allocate a pseudo tty.");
Damien Miller95def091999-11-25 00:26:21 +11001583 else
Darren Tuckerd6173c02008-06-13 04:52:53 +10001584 packet_disconnect("Protocol error waiting for pty "
1585 "request response.");
Damien Miller95def091999-11-25 00:26:21 +11001586 }
1587 /* Request X11 forwarding if enabled and DISPLAY is set. */
Damien Miller17e7ed02005-06-17 12:54:33 +10001588 display = getenv("DISPLAY");
1589 if (options.forward_x11 && display != NULL) {
Ben Lindstrom4a4bd712001-12-06 17:45:19 +00001590 char *proto, *data;
Damien Millerbd483e72000-04-30 10:00:53 +10001591 /* Get reasonable local authentication information. */
Damien Miller17e7ed02005-06-17 12:54:33 +10001592 client_x11_get_proto(display, options.xauth_location,
Damien Miller386feab2013-10-15 12:14:49 +11001593 options.forward_x11_trusted,
Damien Miller1ab6a512010-06-26 10:02:24 +10001594 options.forward_x11_timeout,
1595 &proto, &data);
Damien Millerbd483e72000-04-30 10:00:53 +10001596 /* Request forwarding with authentication spoofing. */
Darren Tuckerd6173c02008-06-13 04:52:53 +10001597 debug("Requesting X11 forwarding with authentication "
1598 "spoofing.");
Damien Miller6d7b4372011-06-23 08:31:57 +10001599 x11_request_forwarding_with_spoofing(0, display, proto,
1600 data, 0);
Damien Miller95def091999-11-25 00:26:21 +11001601 /* Read response from the server. */
Damien Millerdff50992002-01-22 23:16:32 +11001602 type = packet_read();
Damien Miller95def091999-11-25 00:26:21 +11001603 if (type == SSH_SMSG_SUCCESS) {
Damien Miller95def091999-11-25 00:26:21 +11001604 interactive = 1;
Damien Millerbd483e72000-04-30 10:00:53 +10001605 } else if (type == SSH_SMSG_FAILURE) {
Damien Miller996acd22003-04-09 20:59:48 +10001606 logit("Warning: Remote host denied X11 forwarding.");
Damien Millerbd483e72000-04-30 10:00:53 +10001607 } else {
Darren Tuckerd6173c02008-06-13 04:52:53 +10001608 packet_disconnect("Protocol error waiting for X11 "
1609 "forwarding");
Damien Millerbd483e72000-04-30 10:00:53 +10001610 }
Damien Miller95def091999-11-25 00:26:21 +11001611 }
1612 /* Tell the packet module whether this is an interactive session. */
Damien Miller0dac6fb2010-11-20 15:19:38 +11001613 packet_set_interactive(interactive,
1614 options.ip_qos_interactive, options.ip_qos_bulk);
Damien Miller95def091999-11-25 00:26:21 +11001615
1616 /* Request authentication agent forwarding if appropriate. */
Damien Miller0bc1bd82000-11-13 22:57:25 +11001617 check_agent_present();
1618
Damien Miller95def091999-11-25 00:26:21 +11001619 if (options.forward_agent) {
1620 debug("Requesting authentication agent forwarding.");
1621 auth_request_forwarding();
1622
1623 /* Read response from the server. */
Damien Millerdff50992002-01-22 23:16:32 +11001624 type = packet_read();
Damien Miller48b03fc2002-01-22 23:11:40 +11001625 packet_check_eom();
Damien Miller95def091999-11-25 00:26:21 +11001626 if (type != SSH_SMSG_SUCCESS)
Damien Miller996acd22003-04-09 20:59:48 +10001627 logit("Warning: Remote host denied authentication agent forwarding.");
Damien Miller95def091999-11-25 00:26:21 +11001628 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001629
Damien Miller0bc1bd82000-11-13 22:57:25 +11001630 /* Initiate port forwardings. */
Darren Tucker2d6665d2011-11-04 10:54:22 +11001631 ssh_init_stdio_forwarding();
Damien Miller0bc1bd82000-11-13 22:57:25 +11001632 ssh_init_forwarding();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001633
Darren Tuckerb776c852007-12-02 23:06:35 +11001634 /* Execute a local command */
1635 if (options.local_command != NULL &&
1636 options.permit_local_command)
1637 ssh_local_cmd(options.local_command);
1638
Darren Tucker9a2a6092008-07-04 12:53:50 +10001639 /*
1640 * If requested and we are not interested in replies to remote
1641 * forwarding requests, then let ssh continue in the background.
1642 */
Damien Millere11e1ea2010-08-03 16:04:46 +10001643 if (fork_after_authentication_flag) {
1644 if (options.exit_on_forward_failure &&
1645 options.num_remote_forwards > 0) {
1646 debug("deferring postauth fork until remote forward "
1647 "confirmation received");
1648 } else
1649 fork_postauth();
Darren Tucker9a2a6092008-07-04 12:53:50 +10001650 }
Damien Miller5428f641999-11-25 11:54:57 +11001651
1652 /*
1653 * If a command was specified on the command line, execute the
1654 * command now. Otherwise request the server to start a shell.
1655 */
Damien Miller95def091999-11-25 00:26:21 +11001656 if (buffer_len(&command) > 0) {
1657 int len = buffer_len(&command);
1658 if (len > 900)
1659 len = 900;
Darren Tuckerd6173c02008-06-13 04:52:53 +10001660 debug("Sending command: %.*s", len,
1661 (u_char *)buffer_ptr(&command));
Damien Miller95def091999-11-25 00:26:21 +11001662 packet_start(SSH_CMSG_EXEC_CMD);
1663 packet_put_string(buffer_ptr(&command), buffer_len(&command));
1664 packet_send();
1665 packet_write_wait();
1666 } else {
1667 debug("Requesting shell.");
1668 packet_start(SSH_CMSG_EXEC_SHELL);
1669 packet_send();
1670 packet_write_wait();
1671 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001672
Damien Miller95def091999-11-25 00:26:21 +11001673 /* Enter the interactive session. */
Ben Lindstrom2b1f71b2001-06-05 20:32:21 +00001674 return client_loop(have_tty, tty_flag ?
1675 options.escape_char : SSH_ESCAPECHAR_NONE, 0);
Damien Miller1383bd82000-04-06 12:32:37 +10001676}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001677
Ben Lindstromf558cf62001-09-20 23:13:49 +00001678/* request pty/x11/agent/tcpfwd/shell for channel */
Ben Lindstrombba81212001-06-25 05:01:22 +00001679static void
Damien Millerd530f5f2010-05-21 14:57:10 +10001680ssh_session2_setup(int id, int success, void *arg)
Damien Miller1383bd82000-04-06 12:32:37 +10001681{
Damien Miller3756dce2004-06-18 01:17:29 +10001682 extern char **environ;
Damien Miller17e7ed02005-06-17 12:54:33 +10001683 const char *display;
Damien Miller0e220db2004-06-15 10:34:08 +10001684 int interactive = tty_flag;
Damien Miller17e7ed02005-06-17 12:54:33 +10001685
Damien Millerd530f5f2010-05-21 14:57:10 +10001686 if (!success)
1687 return; /* No need for error message, channels code sens one */
1688
Damien Miller46d38de2005-07-17 17:02:09 +10001689 display = getenv("DISPLAY");
Damien Miller17e7ed02005-06-17 12:54:33 +10001690 if (options.forward_x11 && display != NULL) {
Ben Lindstrom4a4bd712001-12-06 17:45:19 +00001691 char *proto, *data;
Damien Millerbd483e72000-04-30 10:00:53 +10001692 /* Get reasonable local authentication information. */
Damien Miller17e7ed02005-06-17 12:54:33 +10001693 client_x11_get_proto(display, options.xauth_location,
Damien Miller1ab6a512010-06-26 10:02:24 +10001694 options.forward_x11_trusted,
1695 options.forward_x11_timeout, &proto, &data);
Damien Millerbd483e72000-04-30 10:00:53 +10001696 /* Request forwarding with authentication spoofing. */
Darren Tuckerd6173c02008-06-13 04:52:53 +10001697 debug("Requesting X11 forwarding with authentication "
1698 "spoofing.");
Damien Miller6d7b4372011-06-23 08:31:57 +10001699 x11_request_forwarding_with_spoofing(id, display, proto,
1700 data, 1);
1701 client_expect_confirm(id, "X11 forwarding", CONFIRM_WARN);
1702 /* XXX exit_on_forward_failure */
Ben Lindstrombf555ba2001-01-18 02:04:35 +00001703 interactive = 1;
Damien Millerbd483e72000-04-30 10:00:53 +10001704 }
1705
Damien Miller0bc1bd82000-11-13 22:57:25 +11001706 check_agent_present();
1707 if (options.forward_agent) {
1708 debug("Requesting authentication agent forwarding.");
1709 channel_request_start(id, "auth-agent-req@openssh.com", 0);
1710 packet_send();
1711 }
1712
Darren Tucker7b305012012-07-02 18:55:09 +10001713 /* Tell the packet module whether this is an interactive session. */
1714 packet_set_interactive(interactive,
1715 options.ip_qos_interactive, options.ip_qos_bulk);
1716
Damien Miller0e220db2004-06-15 10:34:08 +10001717 client_session2_setup(id, tty_flag, subsystem_flag, getenv("TERM"),
Damien Miller5771ed72008-05-19 15:35:33 +10001718 NULL, fileno(stdin), &command, environ);
Damien Miller1383bd82000-04-06 12:32:37 +10001719}
1720
Ben Lindstromf558cf62001-09-20 23:13:49 +00001721/* open new channel for a session */
Ben Lindstrombba81212001-06-25 05:01:22 +00001722static int
Ben Lindstromf558cf62001-09-20 23:13:49 +00001723ssh_session2_open(void)
Damien Miller1383bd82000-04-06 12:32:37 +10001724{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001725 Channel *c;
1726 int window, packetmax, in, out, err;
Damien Millerad833b32000-08-23 10:46:23 +10001727
Damien Millercaf6dd62000-08-29 11:33:50 +11001728 if (stdin_null_flag) {
Ben Lindstrom31ca54a2001-02-09 02:11:24 +00001729 in = open(_PATH_DEVNULL, O_RDONLY);
Damien Millercaf6dd62000-08-29 11:33:50 +11001730 } else {
1731 in = dup(STDIN_FILENO);
1732 }
1733 out = dup(STDOUT_FILENO);
1734 err = dup(STDERR_FILENO);
1735
1736 if (in < 0 || out < 0 || err < 0)
1737 fatal("dup() in/out/err failed");
1738
Damien Miller69b69aa2000-10-28 14:19:58 +11001739 /* enable nonblocking unless tty */
1740 if (!isatty(in))
1741 set_nonblock(in);
1742 if (!isatty(out))
1743 set_nonblock(out);
1744 if (!isatty(err))
1745 set_nonblock(err);
1746
Damien Millere4340be2000-09-16 13:29:08 +11001747 window = CHAN_SES_WINDOW_DEFAULT;
1748 packetmax = CHAN_SES_PACKET_DEFAULT;
Damien Miller19a59452002-02-19 15:20:57 +11001749 if (tty_flag) {
1750 window >>= 1;
1751 packetmax >>= 1;
Damien Miller1383bd82000-04-06 12:32:37 +10001752 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001753 c = channel_new(
Damien Miller1383bd82000-04-06 12:32:37 +10001754 "session", SSH_CHANNEL_OPENING, in, out, err,
Damien Millere4340be2000-09-16 13:29:08 +11001755 window, packetmax, CHAN_EXTENDED_WRITE,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10001756 "client-session", /*nonblock*/0);
Damien Miller1383bd82000-04-06 12:32:37 +10001757
Ben Lindstromf558cf62001-09-20 23:13:49 +00001758 debug3("ssh_session2_open: channel_new: %d", c->self);
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001759
Ben Lindstrom5ec26452001-06-09 00:18:51 +00001760 channel_send_open(c->self);
Ben Lindstromf558cf62001-09-20 23:13:49 +00001761 if (!no_shell_flag)
Damien Millerb84886b2008-05-19 15:05:07 +10001762 channel_register_open_confirm(c->self,
1763 ssh_session2_setup, NULL);
Damien Miller1383bd82000-04-06 12:32:37 +10001764
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001765 return c->self;
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001766}
1767
Ben Lindstrombba81212001-06-25 05:01:22 +00001768static int
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001769ssh_session2(void)
1770{
Ben Lindstromf558cf62001-09-20 23:13:49 +00001771 int id = -1;
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001772
1773 /* XXX should be pre-session */
Darren Tucker2d6665d2011-11-04 10:54:22 +11001774 if (!options.control_persist)
1775 ssh_init_stdio_forwarding();
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001776 ssh_init_forwarding();
1777
Damien Millere11e1ea2010-08-03 16:04:46 +10001778 /* Start listening for multiplex clients */
1779 muxserver_listen();
1780
1781 /*
Darren Tucker2d6665d2011-11-04 10:54:22 +11001782 * If we are in control persist mode and have a working mux listen
1783 * socket, then prepare to background ourselves and have a foreground
1784 * client attach as a control slave.
1785 * NB. we must save copies of the flags that we override for
Damien Millere11e1ea2010-08-03 16:04:46 +10001786 * the backgrounding, since we defer attachment of the slave until
1787 * after the connection is fully established (in particular,
1788 * async rfwd replies have been received for ExitOnForwardFailure).
1789 */
1790 if (options.control_persist && muxserver_sock != -1) {
1791 ostdin_null_flag = stdin_null_flag;
1792 ono_shell_flag = no_shell_flag;
Damien Miller21771e22011-05-15 08:45:50 +10001793 orequest_tty = options.request_tty;
Damien Millere11e1ea2010-08-03 16:04:46 +10001794 otty_flag = tty_flag;
1795 stdin_null_flag = 1;
1796 no_shell_flag = 1;
Damien Millere11e1ea2010-08-03 16:04:46 +10001797 tty_flag = 0;
1798 if (!fork_after_authentication_flag)
1799 need_controlpersist_detach = 1;
1800 fork_after_authentication_flag = 1;
1801 }
Darren Tucker2d6665d2011-11-04 10:54:22 +11001802 /*
1803 * ControlPersist mux listen socket setup failed, attempt the
1804 * stdio forward setup that we skipped earlier.
1805 */
1806 if (options.control_persist && muxserver_sock == -1)
1807 ssh_init_stdio_forwarding();
Damien Millere11e1ea2010-08-03 16:04:46 +10001808
Ben Lindstromf558cf62001-09-20 23:13:49 +00001809 if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN))
1810 id = ssh_session2_open();
Damien Miller649fe022013-07-18 16:13:55 +10001811 else {
1812 packet_set_interactive(
1813 options.control_master == SSHCTL_MASTER_NO,
1814 options.ip_qos_interactive, options.ip_qos_bulk);
1815 }
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001816
Darren Tucker8901fa92008-06-11 09:34:01 +10001817 /* If we don't expect to open a new session, then disallow it */
Damien Miller456e6f02008-11-03 19:20:10 +11001818 if (options.control_master == SSHCTL_MASTER_NO &&
1819 (datafellows & SSH_NEW_OPENSSH)) {
Darren Tucker8901fa92008-06-11 09:34:01 +10001820 debug("Requesting no-more-sessions@openssh.com");
1821 packet_start(SSH2_MSG_GLOBAL_REQUEST);
1822 packet_put_cstring("no-more-sessions@openssh.com");
1823 packet_put_char(0);
1824 packet_send();
1825 }
1826
Damien Millerd27b9472005-12-13 19:29:02 +11001827 /* Execute a local command */
1828 if (options.local_command != NULL &&
1829 options.permit_local_command)
1830 ssh_local_cmd(options.local_command);
1831
Damien Miller1f25ab42010-07-16 13:56:23 +10001832 /*
1833 * If requested and we are not interested in replies to remote
1834 * forwarding requests, then let ssh continue in the background.
1835 */
Damien Millere11e1ea2010-08-03 16:04:46 +10001836 if (fork_after_authentication_flag) {
1837 if (options.exit_on_forward_failure &&
1838 options.num_remote_forwards > 0) {
1839 debug("deferring postauth fork until remote forward "
1840 "confirmation received");
1841 } else
1842 fork_postauth();
Darren Tucker9a2a6092008-07-04 12:53:50 +10001843 }
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001844
Darren Tuckerf1de4e52010-01-08 16:54:59 +11001845 if (options.use_roaming)
1846 request_roaming();
1847
Ben Lindstrom2b1f71b2001-06-05 20:32:21 +00001848 return client_loop(tty_flag, tty_flag ?
1849 options.escape_char : SSH_ESCAPECHAR_NONE, id);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001850}
Damien Miller0bc1bd82000-11-13 22:57:25 +11001851
Ben Lindstrombba81212001-06-25 05:01:22 +00001852static void
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001853load_public_identity_files(void)
1854{
Damien Miller6b1d53c2006-03-31 23:13:21 +11001855 char *filename, *cp, thishost[NI_MAXHOST];
Darren Tuckerb4fbbc62007-12-02 23:16:32 +11001856 char *pwdir = NULL, *pwname = NULL;
Ben Lindstrom711b04a2001-08-06 21:12:42 +00001857 int i = 0;
Ben Lindstrom0936a5b2002-03-26 03:17:42 +00001858 Key *public;
Damien Miller6b1d53c2006-03-31 23:13:21 +11001859 struct passwd *pw;
Damien Miller0a80ca12010-02-27 07:55:05 +11001860 u_int n_ids;
1861 char *identity_files[SSH_MAX_IDENTITY_FILES];
1862 Key *identity_keys[SSH_MAX_IDENTITY_FILES];
Damien Miller7ea845e2010-02-12 09:21:02 +11001863#ifdef ENABLE_PKCS11
Ben Lindstrom0936a5b2002-03-26 03:17:42 +00001864 Key **keys;
Damien Miller7ea845e2010-02-12 09:21:02 +11001865 int nkeys;
Damien Miller0a80ca12010-02-27 07:55:05 +11001866#endif /* PKCS11 */
Ben Lindstrom0936a5b2002-03-26 03:17:42 +00001867
Damien Miller0a80ca12010-02-27 07:55:05 +11001868 n_ids = 0;
Damien Miller1d2c4562014-02-04 11:18:20 +11001869 memset(identity_files, 0, sizeof(identity_files));
1870 memset(identity_keys, 0, sizeof(identity_keys));
Damien Miller0a80ca12010-02-27 07:55:05 +11001871
1872#ifdef ENABLE_PKCS11
Damien Miller7ea845e2010-02-12 09:21:02 +11001873 if (options.pkcs11_provider != NULL &&
Ben Lindstrom0936a5b2002-03-26 03:17:42 +00001874 options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
Damien Miller7ea845e2010-02-12 09:21:02 +11001875 (pkcs11_init(!options.batch_mode) == 0) &&
1876 (nkeys = pkcs11_add_provider(options.pkcs11_provider, NULL,
1877 &keys)) > 0) {
Damien Miller7ea845e2010-02-12 09:21:02 +11001878 for (i = 0; i < nkeys; i++) {
Damien Miller0a80ca12010-02-27 07:55:05 +11001879 if (n_ids >= SSH_MAX_IDENTITY_FILES) {
1880 key_free(keys[i]);
1881 continue;
1882 }
1883 identity_keys[n_ids] = keys[i];
1884 identity_files[n_ids] =
Damien Miller7ea845e2010-02-12 09:21:02 +11001885 xstrdup(options.pkcs11_provider); /* XXX */
Damien Miller0a80ca12010-02-27 07:55:05 +11001886 n_ids++;
Ben Lindstrom0936a5b2002-03-26 03:17:42 +00001887 }
Darren Tuckera627d422013-06-02 07:31:17 +10001888 free(keys);
Ben Lindstrom711b04a2001-08-06 21:12:42 +00001889 }
Damien Miller7ea845e2010-02-12 09:21:02 +11001890#endif /* ENABLE_PKCS11 */
Damien Miller6b1d53c2006-03-31 23:13:21 +11001891 if ((pw = getpwuid(original_real_uid)) == NULL)
1892 fatal("load_public_identity_files: getpwuid failed");
Darren Tuckere143f062007-12-02 23:21:16 +11001893 pwname = xstrdup(pw->pw_name);
1894 pwdir = xstrdup(pw->pw_dir);
Damien Miller6b1d53c2006-03-31 23:13:21 +11001895 if (gethostname(thishost, sizeof(thishost)) == -1)
1896 fatal("load_public_identity_files: gethostname: %s",
1897 strerror(errno));
Damien Miller0a80ca12010-02-27 07:55:05 +11001898 for (i = 0; i < options.num_identity_files; i++) {
Darren Tucker15fd19c2013-04-05 11:22:26 +11001899 if (n_ids >= SSH_MAX_IDENTITY_FILES ||
1900 strcasecmp(options.identity_files[i], "none") == 0) {
Darren Tuckera627d422013-06-02 07:31:17 +10001901 free(options.identity_files[i]);
Damien Miller0a80ca12010-02-27 07:55:05 +11001902 continue;
1903 }
Damien Miller6b1d53c2006-03-31 23:13:21 +11001904 cp = tilde_expand_filename(options.identity_files[i],
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001905 original_real_uid);
Darren Tuckerb4fbbc62007-12-02 23:16:32 +11001906 filename = percent_expand(cp, "d", pwdir,
1907 "u", pwname, "l", thishost, "h", host,
Damien Miller6b1d53c2006-03-31 23:13:21 +11001908 "r", options.user, (char *)NULL);
Darren Tuckera627d422013-06-02 07:31:17 +10001909 free(cp);
Ben Lindstromd0fca422001-03-26 13:44:06 +00001910 public = key_load_public(filename, NULL);
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001911 debug("identity file %s type %d", filename,
1912 public ? public->type : -1);
Darren Tuckera627d422013-06-02 07:31:17 +10001913 free(options.identity_files[i]);
Damien Miller0a80ca12010-02-27 07:55:05 +11001914 identity_files[n_ids] = filename;
1915 identity_keys[n_ids] = public;
1916
1917 if (++n_ids >= SSH_MAX_IDENTITY_FILES)
1918 continue;
1919
1920 /* Try to add the certificate variant too */
1921 xasprintf(&cp, "%s-cert", filename);
1922 public = key_load_public(cp, NULL);
1923 debug("identity file %s type %d", cp,
1924 public ? public->type : -1);
1925 if (public == NULL) {
Darren Tuckera627d422013-06-02 07:31:17 +10001926 free(cp);
Damien Miller0a80ca12010-02-27 07:55:05 +11001927 continue;
1928 }
1929 if (!key_is_cert(public)) {
1930 debug("%s: key %s type %s is not a certificate",
1931 __func__, cp, key_type(public));
1932 key_free(public);
Darren Tuckera627d422013-06-02 07:31:17 +10001933 free(cp);
Damien Miller0a80ca12010-02-27 07:55:05 +11001934 continue;
1935 }
1936 identity_keys[n_ids] = public;
1937 /* point to the original path, most likely the private key */
1938 identity_files[n_ids] = xstrdup(filename);
1939 n_ids++;
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001940 }
Damien Miller0a80ca12010-02-27 07:55:05 +11001941 options.num_identity_files = n_ids;
1942 memcpy(options.identity_files, identity_files, sizeof(identity_files));
1943 memcpy(options.identity_keys, identity_keys, sizeof(identity_keys));
1944
Damien Miller1d2c4562014-02-04 11:18:20 +11001945 explicit_bzero(pwname, strlen(pwname));
Darren Tuckera627d422013-06-02 07:31:17 +10001946 free(pwname);
Damien Miller1d2c4562014-02-04 11:18:20 +11001947 explicit_bzero(pwdir, strlen(pwdir));
Darren Tuckera627d422013-06-02 07:31:17 +10001948 free(pwdir);
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001949}
Damien Miller857b02e2010-09-24 22:02:56 +10001950
1951static void
1952main_sigchld_handler(int sig)
1953{
1954 int save_errno = errno;
1955 pid_t pid;
1956 int status;
1957
1958 while ((pid = waitpid(-1, &status, WNOHANG)) > 0 ||
1959 (pid < 0 && errno == EINTR))
1960 ;
1961
1962 signal(sig, main_sigchld_handler);
1963 errno = save_errno;
1964}