blob: 37dcdc7053b4ee24f8f02936dd5323ab1f78b047 [file] [log] [blame]
mmcc@openbsd.orgd59ce082015-12-10 17:08:40 +00001/* $OpenBSD: ssh.c,v 1.431 2015/12/10 17:08:40 mmcc Exp $ */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002/*
Damien Miller95def091999-11-25 00:26:21 +11003 * Author: Tatu Ylonen <ylo@cs.hut.fi>
4 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5 * All rights reserved
Damien Miller95def091999-11-25 00:26:21 +11006 * Ssh client program. This program can be used to log into a remote machine.
7 * The software supports strong authentication, encryption, and forwarding
8 * of X11, TCP/IP, and authentication connections.
9 *
Damien Millere4340be2000-09-16 13:29:08 +110010 * As far as I am concerned, the code I have written for this software
11 * can be used freely for any purpose. Any derived versions of this
12 * software must be clearly marked as such, and if the derived work is
13 * incompatible with the protocol description in the RFC file, it must be
14 * called by a name other than "ssh" or "Secure Shell".
15 *
16 * Copyright (c) 1999 Niels Provos. All rights reserved.
Darren Tucker0a118da2003-10-15 15:54:32 +100017 * Copyright (c) 2000, 2001, 2002, 2003 Markus Friedl. All rights reserved.
Damien Millere4340be2000-09-16 13:29:08 +110018 *
19 * Modified to work with SSL by Niels Provos <provos@citi.umich.edu>
20 * in Canada (German citizen).
21 *
22 * Redistribution and use in source and binary forms, with or without
23 * modification, are permitted provided that the following conditions
24 * are met:
25 * 1. Redistributions of source code must retain the above copyright
26 * notice, this list of conditions and the following disclaimer.
27 * 2. Redistributions in binary form must reproduce the above copyright
28 * notice, this list of conditions and the following disclaimer in the
29 * documentation and/or other materials provided with the distribution.
30 *
31 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
32 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
33 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
34 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
35 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
36 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
37 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
38 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
39 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
40 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Damien Miller95def091999-11-25 00:26:21 +110041 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100042
43#include "includes.h"
Damien Millercd4223c2006-03-15 11:22:47 +110044
Damien Millerf17883e2006-03-15 11:45:54 +110045#include <sys/types.h>
46#ifdef HAVE_SYS_STAT_H
47# include <sys/stat.h>
48#endif
Damien Millercd4223c2006-03-15 11:22:47 +110049#include <sys/resource.h>
Damien Miller17e91c02006-03-15 11:28:34 +110050#include <sys/ioctl.h>
Damien Millere3b60b52006-07-10 21:08:03 +100051#include <sys/socket.h>
Damien Miller857b02e2010-09-24 22:02:56 +100052#include <sys/wait.h>
Damien Miller03e20032006-03-15 11:16:59 +110053
Damien Millerc7b06362006-03-15 11:53:45 +110054#include <ctype.h>
Darren Tuckerba724052006-07-12 22:24:22 +100055#include <errno.h>
Damien Miller57cf6382006-07-10 21:13:46 +100056#include <fcntl.h>
Damien Millerb8fe89c2006-07-24 14:51:00 +100057#include <netdb.h>
Damien Miller6645e7a2006-03-15 14:42:54 +110058#ifdef HAVE_PATHS_H
Damien Miller03e20032006-03-15 11:16:59 +110059#include <paths.h>
Damien Miller6645e7a2006-03-15 14:42:54 +110060#endif
Damien Miller9f2abc42006-07-10 20:53:08 +100061#include <pwd.h>
Damien Miller6ff3cad2006-03-15 11:52:09 +110062#include <signal.h>
Damien Millerded319c2006-09-01 15:38:36 +100063#include <stdarg.h>
Damien Miller2d00e632006-07-24 13:53:19 +100064#include <stddef.h>
Damien Millera7a73ee2006-08-05 11:37:59 +100065#include <stdio.h>
Damien Millere7a1e5c2006-08-05 11:34:19 +100066#include <stdlib.h>
Damien Millere3476ed2006-07-24 14:13:33 +100067#include <string.h>
Damien Millere6b3b612006-07-24 14:01:23 +100068#include <unistd.h>
deraadt@openbsd.org087266e2015-01-20 23:14:00 +000069#include <limits.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"
djm@openbsd.org141efe42015-01-14 20:05:27 +0000110#include "ssherr.h"
djm@openbsd.orgf9eca242015-07-30 00:01:34 +0000111#include "myproposal.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000112
Damien Miller7ea845e2010-02-12 09:21:02 +1100113#ifdef ENABLE_PKCS11
114#include "ssh-pkcs11.h"
Ben Lindstrombcc18082001-08-06 21:59:25 +0000115#endif
Ben Lindstromc5b68002001-07-04 04:52:03 +0000116
Damien Miller3f905871999-11-15 17:10:57 +1100117extern char *__progname;
Damien Miller3f905871999-11-15 17:10:57 +1100118
Damien Millerea2c1a42011-06-03 12:10:22 +1000119/* Saves a copy of argv for setproctitle emulation */
120#ifndef HAVE_SETPROCTITLE
121static char **saved_av;
122#endif
123
Darren Tuckerd6173c02008-06-13 04:52:53 +1000124/* Flag indicating whether debug mode is on. May be set on the command line. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000125int debug_flag = 0;
126
Damien Miller21771e22011-05-15 08:45:50 +1000127/* Flag indicating whether a tty should be requested */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000128int tty_flag = 0;
129
Damien Miller1383bd82000-04-06 12:32:37 +1000130/* don't exec a shell */
131int no_shell_flag = 0;
Damien Miller1383bd82000-04-06 12:32:37 +1000132
Damien Miller5428f641999-11-25 11:54:57 +1100133/*
134 * Flag indicating that nothing should be read from stdin. This can be set
135 * on the command line.
136 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000137int stdin_null_flag = 0;
138
Damien Miller5428f641999-11-25 11:54:57 +1100139/*
Damien Millere11e1ea2010-08-03 16:04:46 +1000140 * Flag indicating that the current process should be backgrounded and
141 * a new slave launched in the foreground for ControlPersist.
142 */
143int need_controlpersist_detach = 0;
144
145/* Copies of flags for ControlPersist foreground slave */
Damien Miller21771e22011-05-15 08:45:50 +1000146int ostdin_null_flag, ono_shell_flag, otty_flag, orequest_tty;
Damien Millere11e1ea2010-08-03 16:04:46 +1000147
148/*
Damien Miller5428f641999-11-25 11:54:57 +1100149 * Flag indicating that ssh should fork after authentication. This is useful
Ben Lindstromf666fec2002-06-06 19:51:58 +0000150 * so that the passphrase can be entered manually, and then ssh goes to the
Damien Miller5428f641999-11-25 11:54:57 +1100151 * background.
152 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000153int fork_after_authentication_flag = 0;
154
Darren Tucker7ad8dd22010-01-12 19:40:27 +1100155/* forward stdio to remote host and port */
156char *stdio_forward_host = NULL;
157int stdio_forward_port = 0;
158
Damien Miller5428f641999-11-25 11:54:57 +1100159/*
160 * General data structure for command line options and options configurable
161 * in configuration files. See readconf.h.
162 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000163Options options;
164
Ben Lindstrom14f31ab2001-09-12 17:48:04 +0000165/* optional user configfile */
166char *config = NULL;
167
Damien Miller5428f641999-11-25 11:54:57 +1100168/*
169 * Name of the host we are connecting to. This is the name given on the
170 * command line, or the HostName specified for the user-supplied name in a
171 * configuration file.
172 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000173char *host;
174
175/* socket address the host resolves to */
Damien Miller34132e52000-01-14 15:45:46 +1100176struct sockaddr_storage hostaddr;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000177
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000178/* Private host keys. */
Ben Lindstrom1bad2562002-06-06 19:57:33 +0000179Sensitive sensitive_data;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000180
181/* Original real UID. */
182uid_t original_real_uid;
Ben Lindstromf9c48842002-06-11 16:37:51 +0000183uid_t original_effective_uid;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000184
Damien Miller1383bd82000-04-06 12:32:37 +1000185/* command to be executed */
186Buffer command;
187
Damien Miller832562e2001-01-30 09:30:01 +1100188/* Should we execute a command or invoke a subsystem? */
189int subsystem_flag = 0;
190
Damien Miller2797f7f2002-04-23 21:09:44 +1000191/* # of replies received for global requests */
Darren Tucker9f407c42008-06-13 04:50:27 +1000192static int remote_forward_confirms_received = 0;
Damien Miller2797f7f2002-04-23 21:09:44 +1000193
Damien Millerb1cbfa22008-05-19 16:00:08 +1000194/* mux.c */
195extern int muxserver_sock;
196extern u_int muxclient_command;
Damien Miller0e220db2004-06-15 10:34:08 +1000197
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000198/* Prints a help message to the user. This function never returns. */
199
Ben Lindstrombba81212001-06-25 05:01:22 +0000200static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000201usage(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000202{
Damien Miller50955102004-03-22 09:34:58 +1100203 fprintf(stderr,
jmc@openbsd.orgb1ba15f2014-10-09 06:21:31 +0000204"usage: ssh [-1246AaCfGgKkMNnqsTtVvXxYy] [-b bind_address] [-c cipher_spec]\n"
Damien Miller03d4d7e2013-04-23 15:21:06 +1000205" [-D [bind_address:]port] [-E log_file] [-e escape_char]\n"
jmc@openbsd.org846f6fa2015-09-11 06:55:46 +0000206" [-F configfile] [-I pkcs11] [-i identity_file] [-L address]\n"
207" [-l login_name] [-m mac_spec] [-O ctl_cmd] [-o option] [-p port]\n"
208" [-Q query_option] [-R address] [-S ctl_path] [-W host:port]\n"
Damien Millerbdb352a2013-12-05 10:20:52 +1100209" [-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
djm@openbsd.orgb1d38a32015-10-15 23:51:40 +0000253 snprintf(strport, sizeof strport, "%d", 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/*
djm@openbsd.org90109022015-01-16 07:19:48 +0000279 * Attempt to resolve a numeric host address / port to a single address.
280 * Returns a canonical address string.
281 * Returns NULL on failure.
282 * NB. this function must operate with a options having undefined members.
283 */
284static struct addrinfo *
285resolve_addr(const char *name, int port, char *caddr, size_t clen)
286{
287 char addr[NI_MAXHOST], strport[NI_MAXSERV];
288 struct addrinfo hints, *res;
289 int gaierr;
290
291 if (port <= 0)
292 port = default_ssh_port();
293 snprintf(strport, sizeof strport, "%u", port);
294 memset(&hints, 0, sizeof(hints));
295 hints.ai_family = options.address_family == -1 ?
296 AF_UNSPEC : options.address_family;
297 hints.ai_socktype = SOCK_STREAM;
298 hints.ai_flags = AI_NUMERICHOST|AI_NUMERICSERV;
299 if ((gaierr = getaddrinfo(name, strport, &hints, &res)) != 0) {
300 debug2("%s: could not resolve name %.100s as address: %s",
301 __func__, name, ssh_gai_strerror(gaierr));
302 return NULL;
303 }
304 if (res == NULL) {
305 debug("%s: getaddrinfo %.100s returned no addresses",
306 __func__, name);
307 return NULL;
308 }
309 if (res->ai_next != NULL) {
310 debug("%s: getaddrinfo %.100s returned multiple addresses",
311 __func__, name);
312 goto fail;
313 }
314 if ((gaierr = getnameinfo(res->ai_addr, res->ai_addrlen,
315 addr, sizeof(addr), NULL, 0, NI_NUMERICHOST)) != 0) {
316 debug("%s: Could not format address for name %.100s: %s",
317 __func__, name, ssh_gai_strerror(gaierr));
318 goto fail;
319 }
320 if (strlcpy(caddr, addr, clen) >= clen) {
321 error("%s: host \"%s\" addr \"%s\" too long (max %lu)",
322 __func__, name, addr, (u_long)clen);
323 if (clen > 0)
324 *caddr = '\0';
325 fail:
326 freeaddrinfo(res);
327 return NULL;
328 }
329 return res;
330}
331
332/*
Damien Miller0faf7472013-10-17 11:47:23 +1100333 * Check whether the cname is a permitted replacement for the hostname
334 * and perform the replacement if it is.
Damien Miller13f97b22014-02-24 15:57:55 +1100335 * NB. this function must operate with a options having undefined members.
Damien Miller0faf7472013-10-17 11:47:23 +1100336 */
337static int
338check_follow_cname(char **namep, const char *cname)
339{
340 int i;
341 struct allowed_cname *rule;
342
343 if (*cname == '\0' || options.num_permitted_cnames == 0 ||
344 strcmp(*namep, cname) == 0)
345 return 0;
Damien Miller38505592013-10-17 11:48:13 +1100346 if (options.canonicalize_hostname == SSH_CANONICALISE_NO)
Damien Miller0faf7472013-10-17 11:47:23 +1100347 return 0;
348 /*
Damien Miller38505592013-10-17 11:48:13 +1100349 * Don't attempt to canonicalize names that will be interpreted by
Damien Miller0faf7472013-10-17 11:47:23 +1100350 * a proxy unless the user specifically requests so.
351 */
Damien Miller13f97b22014-02-24 15:57:55 +1100352 if (!option_clear_or_none(options.proxy_command) &&
Damien Miller38505592013-10-17 11:48:13 +1100353 options.canonicalize_hostname != SSH_CANONICALISE_ALWAYS)
Damien Miller0faf7472013-10-17 11:47:23 +1100354 return 0;
355 debug3("%s: check \"%s\" CNAME \"%s\"", __func__, *namep, cname);
356 for (i = 0; i < options.num_permitted_cnames; i++) {
357 rule = options.permitted_cnames + i;
djm@openbsd.orge661a862015-05-04 06:10:48 +0000358 if (match_pattern_list(*namep, rule->source_list, 1) != 1 ||
359 match_pattern_list(cname, rule->target_list, 1) != 1)
Damien Miller0faf7472013-10-17 11:47:23 +1100360 continue;
Damien Miller38505592013-10-17 11:48:13 +1100361 verbose("Canonicalized DNS aliased hostname "
Damien Miller0faf7472013-10-17 11:47:23 +1100362 "\"%s\" => \"%s\"", *namep, cname);
363 free(*namep);
364 *namep = xstrdup(cname);
365 return 1;
366 }
367 return 0;
368}
369
370/*
371 * Attempt to resolve the supplied hostname after applying the user's
Damien Miller51682fa2013-10-17 11:48:31 +1100372 * canonicalization rules. Returns the address list for the host or NULL
373 * if no name was found after canonicalization.
Damien Miller13f97b22014-02-24 15:57:55 +1100374 * NB. this function must operate with a options having undefined members.
Damien Miller0faf7472013-10-17 11:47:23 +1100375 */
376static struct addrinfo *
Damien Miller13f97b22014-02-24 15:57:55 +1100377resolve_canonicalize(char **hostp, int port)
Damien Miller0faf7472013-10-17 11:47:23 +1100378{
379 int i, ndots;
djm@openbsd.org90109022015-01-16 07:19:48 +0000380 char *cp, *fullhost, newname[NI_MAXHOST];
Damien Miller0faf7472013-10-17 11:47:23 +1100381 struct addrinfo *addrs;
382
Damien Miller38505592013-10-17 11:48:13 +1100383 if (options.canonicalize_hostname == SSH_CANONICALISE_NO)
Damien Miller0faf7472013-10-17 11:47:23 +1100384 return NULL;
Damien Miller13f97b22014-02-24 15:57:55 +1100385
Damien Miller0faf7472013-10-17 11:47:23 +1100386 /*
Damien Miller38505592013-10-17 11:48:13 +1100387 * Don't attempt to canonicalize names that will be interpreted by
Damien Miller0faf7472013-10-17 11:47:23 +1100388 * a proxy unless the user specifically requests so.
389 */
Damien Miller13f97b22014-02-24 15:57:55 +1100390 if (!option_clear_or_none(options.proxy_command) &&
Damien Miller38505592013-10-17 11:48:13 +1100391 options.canonicalize_hostname != SSH_CANONICALISE_ALWAYS)
Damien Miller0faf7472013-10-17 11:47:23 +1100392 return NULL;
Damien Miller13f97b22014-02-24 15:57:55 +1100393
djm@openbsd.org90109022015-01-16 07:19:48 +0000394 /* Try numeric hostnames first */
395 if ((addrs = resolve_addr(*hostp, port,
396 newname, sizeof(newname))) != NULL) {
397 debug2("%s: hostname %.100s is address", __func__, *hostp);
398 if (strcasecmp(*hostp, newname) != 0) {
399 debug2("%s: canonicalised address \"%s\" => \"%s\"",
400 __func__, *hostp, newname);
401 free(*hostp);
402 *hostp = xstrdup(newname);
403 }
404 return addrs;
405 }
406
djm@openbsd.org5ee00632015-10-16 18:40:49 +0000407 /* If domain name is anchored, then resolve it now */
408 if ((*hostp)[strlen(*hostp) - 1] == '.') {
409 debug3("%s: name is fully qualified", __func__);
410 fullhost = xstrdup(*hostp);
411 if ((addrs = resolve_host(fullhost, port, 0,
412 newname, sizeof(newname))) != NULL)
413 goto found;
414 free(fullhost);
415 goto notfound;
416 }
417
Damien Miller51682fa2013-10-17 11:48:31 +1100418 /* Don't apply canonicalization to sufficiently-qualified hostnames */
Damien Miller0faf7472013-10-17 11:47:23 +1100419 ndots = 0;
420 for (cp = *hostp; *cp != '\0'; cp++) {
421 if (*cp == '.')
422 ndots++;
423 }
Damien Miller38505592013-10-17 11:48:13 +1100424 if (ndots > options.canonicalize_max_dots) {
425 debug3("%s: not canonicalizing hostname \"%s\" (max dots %d)",
426 __func__, *hostp, options.canonicalize_max_dots);
Damien Miller0faf7472013-10-17 11:47:23 +1100427 return NULL;
428 }
429 /* Attempt each supplied suffix */
430 for (i = 0; i < options.num_canonical_domains; i++) {
djm@openbsd.org90109022015-01-16 07:19:48 +0000431 *newname = '\0';
Damien Miller0faf7472013-10-17 11:47:23 +1100432 xasprintf(&fullhost, "%s.%s.", *hostp,
433 options.canonical_domains[i]);
Damien Miller13f97b22014-02-24 15:57:55 +1100434 debug3("%s: attempting \"%s\" => \"%s\"", __func__,
435 *hostp, fullhost);
436 if ((addrs = resolve_host(fullhost, port, 0,
djm@openbsd.org90109022015-01-16 07:19:48 +0000437 newname, sizeof(newname))) == NULL) {
Damien Miller0faf7472013-10-17 11:47:23 +1100438 free(fullhost);
439 continue;
440 }
djm@openbsd.org5ee00632015-10-16 18:40:49 +0000441 found:
Damien Miller0faf7472013-10-17 11:47:23 +1100442 /* Remove trailing '.' */
443 fullhost[strlen(fullhost) - 1] = '\0';
444 /* Follow CNAME if requested */
djm@openbsd.org90109022015-01-16 07:19:48 +0000445 if (!check_follow_cname(&fullhost, newname)) {
Damien Miller38505592013-10-17 11:48:13 +1100446 debug("Canonicalized hostname \"%s\" => \"%s\"",
Damien Miller0faf7472013-10-17 11:47:23 +1100447 *hostp, fullhost);
448 }
449 free(*hostp);
450 *hostp = fullhost;
451 return addrs;
452 }
djm@openbsd.org5ee00632015-10-16 18:40:49 +0000453 notfound:
Damien Miller38505592013-10-17 11:48:13 +1100454 if (!options.canonicalize_fallback_local)
Damien Miller13f97b22014-02-24 15:57:55 +1100455 fatal("%s: Could not resolve host \"%s\"", __progname, *hostp);
456 debug2("%s: host %s not found in any suffix", __func__, *hostp);
Damien Miller0faf7472013-10-17 11:47:23 +1100457 return NULL;
458}
459
Damien Miller95def091999-11-25 00:26:21 +1100460/*
Damien Miller13f97b22014-02-24 15:57:55 +1100461 * Read per-user configuration file. Ignore the system wide config
462 * file if the user specifies a config file on the command line.
463 */
464static void
djm@openbsd.org957fbce2014-10-08 22:20:25 +0000465process_config_files(const char *host_arg, struct passwd *pw, int post_canon)
Damien Miller13f97b22014-02-24 15:57:55 +1100466{
deraadt@openbsd.org087266e2015-01-20 23:14:00 +0000467 char buf[PATH_MAX];
Damien Miller13f97b22014-02-24 15:57:55 +1100468 int r;
469
470 if (config != NULL) {
471 if (strcasecmp(config, "none") != 0 &&
djm@openbsd.org957fbce2014-10-08 22:20:25 +0000472 !read_config_file(config, pw, host, host_arg, &options,
473 SSHCONF_USERCONF | (post_canon ? SSHCONF_POSTCANON : 0)))
Damien Miller13f97b22014-02-24 15:57:55 +1100474 fatal("Can't open user config file %.100s: "
475 "%.100s", config, strerror(errno));
476 } else {
477 r = snprintf(buf, sizeof buf, "%s/%s", pw->pw_dir,
478 _PATH_SSH_USER_CONFFILE);
479 if (r > 0 && (size_t)r < sizeof(buf))
djm@openbsd.org957fbce2014-10-08 22:20:25 +0000480 (void)read_config_file(buf, pw, host, host_arg,
481 &options, SSHCONF_CHECKPERM | SSHCONF_USERCONF |
482 (post_canon ? SSHCONF_POSTCANON : 0));
Damien Miller13f97b22014-02-24 15:57:55 +1100483
484 /* Read systemwide configuration file after user config. */
djm@openbsd.org957fbce2014-10-08 22:20:25 +0000485 (void)read_config_file(_PATH_HOST_CONFIG_FILE, pw,
486 host, host_arg, &options,
487 post_canon ? SSHCONF_POSTCANON : 0);
488 }
489}
490
491/* Rewrite the port number in an addrinfo list of addresses */
492static void
493set_addrinfo_port(struct addrinfo *addrs, int port)
494{
495 struct addrinfo *addr;
496
497 for (addr = addrs; addr != NULL; addr = addr->ai_next) {
498 switch (addr->ai_family) {
499 case AF_INET:
500 ((struct sockaddr_in *)addr->ai_addr)->
501 sin_port = htons(port);
502 break;
503 case AF_INET6:
504 ((struct sockaddr_in6 *)addr->ai_addr)->
505 sin6_port = htons(port);
506 break;
507 }
Damien Miller13f97b22014-02-24 15:57:55 +1100508 }
509}
510
511/*
Damien Miller95def091999-11-25 00:26:21 +1100512 * Main program for the ssh client.
513 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000514int
515main(int ac, char **av)
516{
djm@openbsd.org957fbce2014-10-08 22:20:25 +0000517 int i, r, opt, exit_status, use_syslog, config_test = 0;
deraadt@openbsd.org087266e2015-01-20 23:14:00 +0000518 char *p, *cp, *line, *argv0, buf[PATH_MAX], *host_arg, *logfile;
Damien Millerdfc85fa2011-05-15 08:44:02 +1000519 char thishost[NI_MAXHOST], shorthost[NI_MAXHOST], portstr[NI_MAXSERV];
djm@openbsd.org674b3b62015-09-11 03:47:28 +0000520 char cname[NI_MAXHOST], uidstr[32], *conn_hash_hex;
Damien Miller95def091999-11-25 00:26:21 +1100521 struct stat st;
Ben Lindstrom086cf212001-03-05 05:56:40 +0000522 struct passwd *pw;
Damien Miller194fd902013-10-15 12:13:05 +1100523 int timeout_ms;
Ben Lindstrom5ccf63a2001-09-24 20:00:10 +0000524 extern int optind, optreset;
Damien Miller4f8e6692001-07-14 13:22:53 +1000525 extern char *optarg;
Damien Miller7acefbb2014-07-18 14:11:24 +1000526 struct Forward fwd;
Damien Miller0faf7472013-10-17 11:47:23 +1100527 struct addrinfo *addrs = NULL;
Damien Miller9c386432014-07-03 21:27:46 +1000528 struct ssh_digest_ctx *md;
529 u_char conn_hash[SSH_DIGEST_MAX_LENGTH];
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000530
Darren Tuckerce321d82005-10-03 18:11:24 +1000531 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
532 sanitise_stdfd();
533
Damien Miller59d3d5b2003-08-22 09:34:41 +1000534 __progname = ssh_get_progname(av[0]);
Damien Millerf9b625c2000-07-09 22:42:32 +1000535
Damien Millerea2c1a42011-06-03 12:10:22 +1000536#ifndef HAVE_SETPROCTITLE
537 /* Prepare for later setproctitle emulation */
538 /* Save argv so it isn't clobbered by setproctitle() emulation */
539 saved_av = xcalloc(ac + 1, sizeof(*saved_av));
540 for (i = 0; i < ac; i++)
541 saved_av[i] = xstrdup(av[i]);
542 saved_av[i] = NULL;
543 compat_init_setproctitle(ac, av);
544 av = saved_av;
545#endif
546
Damien Miller5428f641999-11-25 11:54:57 +1100547 /*
Damien Miller00d9ae22010-08-17 01:59:31 +1000548 * Discard other fds that are hanging around. These can cause problem
549 * with backgrounded ssh processes started by ControlPersist.
550 */
551 closefrom(STDERR_FILENO + 1);
552
553 /*
Damien Miller5428f641999-11-25 11:54:57 +1100554 * Save the original real uid. It will be needed later (uid-swapping
555 * may clobber the real uid).
556 */
Damien Miller95def091999-11-25 00:26:21 +1100557 original_real_uid = getuid();
558 original_effective_uid = geteuid();
Damien Millera8e06ce2003-11-21 23:48:55 +1100559
Damien Miller50b9a602002-09-04 16:50:06 +1000560 /*
561 * Use uid-swapping to give up root privileges for the duration of
562 * option processing. We will re-instantiate the rights when we are
563 * ready to create the privileged port, and will permanently drop
564 * them when the port has been created (actually, when the connection
565 * has been made, as we may need to create the port several times).
566 */
567 PRIV_END;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000568
Damien Miller05dd7952000-10-01 00:42:48 +1100569#ifdef HAVE_SETRLIMIT
Damien Miller95def091999-11-25 00:26:21 +1100570 /* If we are installed setuid root be careful to not drop core. */
571 if (original_real_uid != original_effective_uid) {
572 struct rlimit rlim;
573 rlim.rlim_cur = rlim.rlim_max = 0;
574 if (setrlimit(RLIMIT_CORE, &rlim) < 0)
575 fatal("setrlimit failed: %.100s", strerror(errno));
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000576 }
Damien Millerbac2d8a2000-09-05 16:13:06 +1100577#endif
Ben Lindstrom3fcf1a22001-04-08 18:26:59 +0000578 /* Get user data. */
579 pw = getpwuid(original_real_uid);
580 if (!pw) {
Damien Miller3009d3c2013-07-20 13:22:31 +1000581 logit("No user exists for uid %lu", (u_long)original_real_uid);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100582 exit(255);
Ben Lindstrom3fcf1a22001-04-08 18:26:59 +0000583 }
584 /* Take a copy of the returned structure. */
585 pw = pwcopy(pw);
586
Damien Miller5428f641999-11-25 11:54:57 +1100587 /*
Damien Miller5428f641999-11-25 11:54:57 +1100588 * Set our umask to something reasonable, as some files are created
589 * with the default umask. This will make them world-readable but
590 * writable only by the owner, which is ok for all files for which we
591 * don't set the modes explicitly.
592 */
Damien Miller95def091999-11-25 00:26:21 +1100593 umask(022);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000594
Darren Tuckerd6173c02008-06-13 04:52:53 +1000595 /*
596 * Initialize option structure to indicate that no values have been
597 * set.
598 */
Damien Miller95def091999-11-25 00:26:21 +1100599 initialize_options(&options);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000600
Damien Miller95def091999-11-25 00:26:21 +1100601 /* Parse command-line arguments. */
602 host = NULL;
Damien Millere272a5b2008-11-03 19:22:37 +1100603 use_syslog = 0;
Damien Miller03d4d7e2013-04-23 15:21:06 +1000604 logfile = NULL;
Darren Tucker72efd742009-06-21 17:48:00 +1000605 argv0 = av[0];
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000606
Damien Miller2ecb6bd2006-03-15 12:03:53 +1100607 again:
Darren Tuckerd6173c02008-06-13 04:52:53 +1000608 while ((opt = getopt(ac, av, "1246ab:c:e:fgi:kl:m:no:p:qstvx"
djm@openbsd.org957fbce2014-10-08 22:20:25 +0000609 "ACD:E:F:GI:KL:MNO:PQ:R:S:TVw:W:XYy")) != -1) {
Damien Miller95def091999-11-25 00:26:21 +1100610 switch (opt) {
Ben Lindstrom1e7d3062001-02-09 02:36:43 +0000611 case '1':
612 options.protocol = SSH_PROTO_1;
613 break;
Damien Miller4af51302000-04-16 11:18:38 +1000614 case '2':
615 options.protocol = SSH_PROTO_2;
616 break;
Damien Miller34132e52000-01-14 15:45:46 +1100617 case '4':
Darren Tucker0a4f04b2003-07-03 20:37:47 +1000618 options.address_family = AF_INET;
Damien Miller34132e52000-01-14 15:45:46 +1100619 break;
Damien Miller34132e52000-01-14 15:45:46 +1100620 case '6':
Darren Tucker0a4f04b2003-07-03 20:37:47 +1000621 options.address_family = AF_INET6;
Damien Miller34132e52000-01-14 15:45:46 +1100622 break;
Damien Miller95def091999-11-25 00:26:21 +1100623 case 'n':
624 stdin_null_flag = 1;
625 break;
Damien Miller95def091999-11-25 00:26:21 +1100626 case 'f':
627 fork_after_authentication_flag = 1;
628 stdin_null_flag = 1;
629 break;
Damien Miller95def091999-11-25 00:26:21 +1100630 case 'x':
631 options.forward_x11 = 0;
632 break;
Damien Miller95def091999-11-25 00:26:21 +1100633 case 'X':
634 options.forward_x11 = 1;
635 break;
Damien Millere272a5b2008-11-03 19:22:37 +1100636 case 'y':
637 use_syslog = 1;
638 break;
Damien Miller03d4d7e2013-04-23 15:21:06 +1000639 case 'E':
dtucker@openbsd.org4f7cc2f2015-09-04 08:21:47 +0000640 logfile = optarg;
Damien Miller03d4d7e2013-04-23 15:21:06 +1000641 break;
djm@openbsd.org957fbce2014-10-08 22:20:25 +0000642 case 'G':
643 config_test = 1;
644 break;
Darren Tucker0a118da2003-10-15 15:54:32 +1000645 case 'Y':
646 options.forward_x11 = 1;
647 options.forward_x11_trusted = 1;
648 break;
Damien Miller95def091999-11-25 00:26:21 +1100649 case 'g':
Damien Miller7acefbb2014-07-18 14:11:24 +1000650 options.fwd_opts.gateway_ports = 1;
Damien Miller95def091999-11-25 00:26:21 +1100651 break;
Darren Tucker7ebfc102004-11-07 20:06:19 +1100652 case 'O':
Damien Millere1537f92010-01-26 13:26:22 +1100653 if (stdio_forward_host != NULL)
654 fatal("Cannot specify multiplexing "
655 "command with -W");
656 else if (muxclient_command != 0)
657 fatal("Multiplexing command already specified");
Darren Tucker7ebfc102004-11-07 20:06:19 +1100658 if (strcmp(optarg, "check") == 0)
Damien Millerb1cbfa22008-05-19 16:00:08 +1000659 muxclient_command = SSHMUX_COMMAND_ALIVE_CHECK;
Damien Miller388f6fc2010-05-21 14:57:35 +1000660 else if (strcmp(optarg, "forward") == 0)
661 muxclient_command = SSHMUX_COMMAND_FORWARD;
Darren Tucker7ebfc102004-11-07 20:06:19 +1100662 else if (strcmp(optarg, "exit") == 0)
Damien Millerb1cbfa22008-05-19 16:00:08 +1000663 muxclient_command = SSHMUX_COMMAND_TERMINATE;
Damien Miller6c3eec72011-05-05 14:16:22 +1000664 else if (strcmp(optarg, "stop") == 0)
665 muxclient_command = SSHMUX_COMMAND_STOP;
Damien Millerf6dff7c2011-09-22 21:38:52 +1000666 else if (strcmp(optarg, "cancel") == 0)
667 muxclient_command = SSHMUX_COMMAND_CANCEL_FWD;
Darren Tucker7ebfc102004-11-07 20:06:19 +1100668 else
669 fatal("Invalid multiplex command.");
670 break;
Damien Miller147bba32002-09-04 16:46:06 +1000671 case 'P': /* deprecated */
Damien Miller95def091999-11-25 00:26:21 +1100672 options.use_privileged_port = 0;
673 break;
Damien Millerd937dc02013-12-05 10:19:54 +1100674 case 'Q':
Damien Millerea111192013-04-23 19:24:32 +1000675 cp = NULL;
Damien Millerd937dc02013-12-05 10:19:54 +1100676 if (strcmp(optarg, "cipher") == 0)
Damien Miller0fde8ac2013-11-21 14:12:23 +1100677 cp = cipher_alg_list('\n', 0);
Damien Millerd937dc02013-12-05 10:19:54 +1100678 else if (strcmp(optarg, "cipher-auth") == 0)
Damien Miller0fde8ac2013-11-21 14:12:23 +1100679 cp = cipher_alg_list('\n', 1);
Damien Millerd937dc02013-12-05 10:19:54 +1100680 else if (strcmp(optarg, "mac") == 0)
Damien Miller690d9892013-11-08 12:16:49 +1100681 cp = mac_alg_list('\n');
Damien Millerd937dc02013-12-05 10:19:54 +1100682 else if (strcmp(optarg, "kex") == 0)
Damien Miller690d9892013-11-08 12:16:49 +1100683 cp = kex_alg_list('\n');
Damien Millerd937dc02013-12-05 10:19:54 +1100684 else if (strcmp(optarg, "key") == 0)
Damien Miller5be9d9e2013-12-07 11:24:01 +1100685 cp = key_alg_list(0, 0);
686 else if (strcmp(optarg, "key-cert") == 0)
687 cp = key_alg_list(1, 0);
688 else if (strcmp(optarg, "key-plain") == 0)
689 cp = key_alg_list(0, 1);
djm@openbsd.org68d2dfc2015-03-03 06:48:58 +0000690 else if (strcmp(optarg, "protocol-version") == 0) {
691#ifdef WITH_SSH1
692 cp = xstrdup("1\n2");
693#else
694 cp = xstrdup("2");
695#endif
696 }
Damien Millerea111192013-04-23 19:24:32 +1000697 if (cp == NULL)
698 fatal("Unsupported query \"%s\"", optarg);
699 printf("%s\n", cp);
700 free(cp);
701 exit(0);
702 break;
Damien Miller95def091999-11-25 00:26:21 +1100703 case 'a':
704 options.forward_agent = 0;
705 break;
Damien Millerb1715dc2000-05-30 13:44:51 +1000706 case 'A':
707 options.forward_agent = 1;
708 break;
Damien Miller95def091999-11-25 00:26:21 +1100709 case 'k':
Damien Millere0113cc2003-11-24 13:10:09 +1100710 options.gss_deleg_creds = 0;
Damien Miller95def091999-11-25 00:26:21 +1100711 break;
Darren Tucker415bddc2007-06-12 23:43:16 +1000712 case 'K':
713 options.gss_authentication = 1;
714 options.gss_deleg_creds = 1;
715 break;
Damien Miller95def091999-11-25 00:26:21 +1100716 case 'i':
dtucker@openbsd.org03239c12015-10-25 23:42:00 +0000717 p = tilde_expand_filename(optarg, original_real_uid);
718 if (stat(p, &st) < 0)
Damien Millerf4614452001-07-14 12:18:10 +1000719 fprintf(stderr, "Warning: Identity file %s "
dtucker@openbsd.org03239c12015-10-25 23:42:00 +0000720 "not accessible: %s.\n", p,
Damien Miller3eb48b62005-03-01 21:15:46 +1100721 strerror(errno));
dtucker@openbsd.org03239c12015-10-25 23:42:00 +0000722 else
723 add_identity_file(&options, NULL, p, 1);
724 free(p);
Damien Miller95def091999-11-25 00:26:21 +1100725 break;
Ben Lindstromc5b68002001-07-04 04:52:03 +0000726 case 'I':
Damien Miller7ea845e2010-02-12 09:21:02 +1100727#ifdef ENABLE_PKCS11
dtucker@openbsd.org4f7cc2f2015-09-04 08:21:47 +0000728 free(options.pkcs11_provider);
Damien Miller7ea845e2010-02-12 09:21:02 +1100729 options.pkcs11_provider = xstrdup(optarg);
Ben Lindstrombcc18082001-08-06 21:59:25 +0000730#else
Damien Miller7ea845e2010-02-12 09:21:02 +1100731 fprintf(stderr, "no support for PKCS#11.\n");
Ben Lindstrombcc18082001-08-06 21:59:25 +0000732#endif
Ben Lindstromc5b68002001-07-04 04:52:03 +0000733 break;
Damien Miller95def091999-11-25 00:26:21 +1100734 case 't':
Damien Miller21771e22011-05-15 08:45:50 +1000735 if (options.request_tty == REQUEST_TTY_YES)
736 options.request_tty = REQUEST_TTY_FORCE;
737 else
738 options.request_tty = REQUEST_TTY_YES;
Damien Miller95def091999-11-25 00:26:21 +1100739 break;
Damien Miller95def091999-11-25 00:26:21 +1100740 case 'v':
Darren Tuckere98dfa32003-07-19 19:54:31 +1000741 if (debug_flag == 0) {
Damien Millere4340be2000-09-16 13:29:08 +1100742 debug_flag = 1;
743 options.log_level = SYSLOG_LEVEL_DEBUG1;
Darren Tuckere98dfa32003-07-19 19:54:31 +1000744 } else {
745 if (options.log_level < SYSLOG_LEVEL_DEBUG3)
746 options.log_level++;
Darren Tuckere98dfa32003-07-19 19:54:31 +1000747 }
Damien Miller03d4d7e2013-04-23 15:21:06 +1000748 break;
Damien Miller95def091999-11-25 00:26:21 +1100749 case 'V':
Damien Miller0c889cd2004-03-22 09:36:00 +1100750 fprintf(stderr, "%s, %s\n",
Damien Miller1f0311c2014-05-15 14:24:09 +1000751 SSH_RELEASE,
752#ifdef WITH_OPENSSL
753 SSLeay_version(SSLEAY_VERSION)
754#else
755 "without OpenSSL"
756#endif
757 );
Damien Miller95def091999-11-25 00:26:21 +1100758 if (opt == 'V')
759 exit(0);
Damien Miller95def091999-11-25 00:26:21 +1100760 break;
Damien Millerd27b9472005-12-13 19:29:02 +1100761 case 'w':
Damien Miller7b58e802005-12-13 19:33:19 +1100762 if (options.tun_open == -1)
763 options.tun_open = SSH_TUNMODE_DEFAULT;
Damien Millerd27b9472005-12-13 19:29:02 +1100764 options.tun_local = a2tun(optarg, &options.tun_remote);
Damien Miller7b58e802005-12-13 19:33:19 +1100765 if (options.tun_local == SSH_TUNID_ERR) {
Darren Tuckerd6173c02008-06-13 04:52:53 +1000766 fprintf(stderr,
767 "Bad tun device '%s'\n", optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100768 exit(255);
Damien Millerd27b9472005-12-13 19:29:02 +1100769 }
770 break;
Darren Tucker7ad8dd22010-01-12 19:40:27 +1100771 case 'W':
Damien Millere1537f92010-01-26 13:26:22 +1100772 if (stdio_forward_host != NULL)
773 fatal("stdio forward already specified");
774 if (muxclient_command != 0)
775 fatal("Cannot specify stdio forward with -O");
Darren Tucker7ad8dd22010-01-12 19:40:27 +1100776 if (parse_forward(&fwd, optarg, 1, 0)) {
777 stdio_forward_host = fwd.listen_host;
778 stdio_forward_port = fwd.listen_port;
Darren Tuckera627d422013-06-02 07:31:17 +1000779 free(fwd.connect_host);
Darren Tucker7ad8dd22010-01-12 19:40:27 +1100780 } else {
781 fprintf(stderr,
782 "Bad stdio forwarding specification '%s'\n",
783 optarg);
784 exit(255);
785 }
Damien Miller21771e22011-05-15 08:45:50 +1000786 options.request_tty = REQUEST_TTY_NO;
Darren Tucker7ad8dd22010-01-12 19:40:27 +1100787 no_shell_flag = 1;
788 options.clear_forwardings = 1;
789 options.exit_on_forward_failure = 1;
790 break;
Damien Miller95def091999-11-25 00:26:21 +1100791 case 'q':
792 options.log_level = SYSLOG_LEVEL_QUIET;
793 break;
Damien Miller95def091999-11-25 00:26:21 +1100794 case 'e':
795 if (optarg[0] == '^' && optarg[2] == 0 &&
Damien Millerf4614452001-07-14 12:18:10 +1000796 (u_char) optarg[1] >= 64 &&
797 (u_char) optarg[1] < 128)
Ben Lindstrom46c16222000-12-22 01:43:59 +0000798 options.escape_char = (u_char) optarg[1] & 31;
Damien Miller95def091999-11-25 00:26:21 +1100799 else if (strlen(optarg) == 1)
Ben Lindstrom46c16222000-12-22 01:43:59 +0000800 options.escape_char = (u_char) optarg[0];
Damien Miller95def091999-11-25 00:26:21 +1100801 else if (strcmp(optarg, "none") == 0)
Ben Lindstrom2b1f71b2001-06-05 20:32:21 +0000802 options.escape_char = SSH_ESCAPECHAR_NONE;
Damien Miller95def091999-11-25 00:26:21 +1100803 else {
Damien Millerf4614452001-07-14 12:18:10 +1000804 fprintf(stderr, "Bad escape character '%s'.\n",
805 optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100806 exit(255);
Damien Miller95def091999-11-25 00:26:21 +1100807 }
808 break;
Damien Miller95def091999-11-25 00:26:21 +1100809 case 'c':
djm@openbsd.orgf9eca242015-07-30 00:01:34 +0000810 if (ciphers_valid(*optarg == '+' ?
811 optarg + 1 : optarg)) {
Damien Millereba71ba2000-04-29 23:57:08 +1000812 /* SSH2 only */
dtucker@openbsd.org4f7cc2f2015-09-04 08:21:47 +0000813 free(options.ciphers);
Damien Millereba71ba2000-04-29 23:57:08 +1000814 options.ciphers = xstrdup(optarg);
Darren Tucker5cb30ad2004-08-12 22:40:24 +1000815 options.cipher = SSH_CIPHER_INVALID;
djm@openbsd.orgf9eca242015-07-30 00:01:34 +0000816 break;
Damien Miller95def091999-11-25 00:26:21 +1100817 }
djm@openbsd.orgf9eca242015-07-30 00:01:34 +0000818 /* SSH1 only */
819 options.cipher = cipher_number(optarg);
820 if (options.cipher == -1) {
821 fprintf(stderr, "Unknown cipher type '%s'\n",
822 optarg);
823 exit(255);
824 }
825 if (options.cipher == SSH_CIPHER_3DES)
826 options.ciphers = xstrdup("3des-cbc");
827 else if (options.cipher == SSH_CIPHER_BLOWFISH)
828 options.ciphers = xstrdup("blowfish-cbc");
829 else
830 options.ciphers = xstrdup(KEX_CLIENT_ENCRYPT);
Damien Miller95def091999-11-25 00:26:21 +1100831 break;
Ben Lindstrom06b33aa2001-02-15 03:01:59 +0000832 case 'm':
dtucker@openbsd.org4f7cc2f2015-09-04 08:21:47 +0000833 if (mac_valid(optarg)) {
834 free(options.macs);
Ben Lindstrom06b33aa2001-02-15 03:01:59 +0000835 options.macs = xstrdup(optarg);
dtucker@openbsd.org4f7cc2f2015-09-04 08:21:47 +0000836 } else {
Damien Millerf4614452001-07-14 12:18:10 +1000837 fprintf(stderr, "Unknown mac type '%s'\n",
838 optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100839 exit(255);
Ben Lindstrom06b33aa2001-02-15 03:01:59 +0000840 }
841 break;
Damien Miller0e220db2004-06-15 10:34:08 +1000842 case 'M':
Damien Millerd14b1e72005-06-16 13:19:41 +1000843 if (options.control_master == SSHCTL_MASTER_YES)
844 options.control_master = SSHCTL_MASTER_ASK;
845 else
846 options.control_master = SSHCTL_MASTER_YES;
Damien Miller0e220db2004-06-15 10:34:08 +1000847 break;
Damien Miller95def091999-11-25 00:26:21 +1100848 case 'p':
Ben Lindstrom19066a12001-04-12 23:39:26 +0000849 options.port = a2port(optarg);
Damien Miller3dc71ad2009-01-28 16:31:22 +1100850 if (options.port <= 0) {
Ben Lindstrom146edb92001-04-11 23:06:28 +0000851 fprintf(stderr, "Bad port '%s'\n", optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100852 exit(255);
Ben Lindstrom146edb92001-04-11 23:06:28 +0000853 }
Damien Miller95def091999-11-25 00:26:21 +1100854 break;
Damien Miller95def091999-11-25 00:26:21 +1100855 case 'l':
856 options.user = optarg;
857 break;
Ben Lindstrom1a174712001-09-12 17:56:15 +0000858
Damien Miller95def091999-11-25 00:26:21 +1100859 case 'L':
Damien Miller4bf648f2009-02-14 16:28:21 +1100860 if (parse_forward(&fwd, optarg, 0, 0))
Damien Millerf91ee4c2005-03-01 21:24:33 +1100861 add_local_forward(&options, &fwd);
862 else {
Damien Millerf4614452001-07-14 12:18:10 +1000863 fprintf(stderr,
Damien Millerf91ee4c2005-03-01 21:24:33 +1100864 "Bad local forwarding specification '%s'\n",
Damien Millerf4614452001-07-14 12:18:10 +1000865 optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100866 exit(255);
Ben Lindstrom1a174712001-09-12 17:56:15 +0000867 }
Damien Millerf91ee4c2005-03-01 21:24:33 +1100868 break;
869
870 case 'R':
Damien Miller4bf648f2009-02-14 16:28:21 +1100871 if (parse_forward(&fwd, optarg, 0, 1)) {
Damien Millerf91ee4c2005-03-01 21:24:33 +1100872 add_remote_forward(&options, &fwd);
873 } else {
874 fprintf(stderr,
875 "Bad remote forwarding specification "
876 "'%s'\n", optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100877 exit(255);
Damien Millerf91ee4c2005-03-01 21:24:33 +1100878 }
Damien Miller95def091999-11-25 00:26:21 +1100879 break;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000880
881 case 'D':
Damien Miller4bf648f2009-02-14 16:28:21 +1100882 if (parse_forward(&fwd, optarg, 1, 0)) {
Damien Millera699d952008-11-03 19:27:34 +1100883 add_local_forward(&options, &fwd);
Damien Millerf91ee4c2005-03-01 21:24:33 +1100884 } else {
Damien Millera699d952008-11-03 19:27:34 +1100885 fprintf(stderr,
886 "Bad dynamic forwarding specification "
887 "'%s'\n", optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100888 exit(255);
Ben Lindstrom146edb92001-04-11 23:06:28 +0000889 }
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000890 break;
891
Damien Miller95def091999-11-25 00:26:21 +1100892 case 'C':
893 options.compression = 1;
894 break;
Damien Miller1383bd82000-04-06 12:32:37 +1000895 case 'N':
896 no_shell_flag = 1;
Damien Miller21771e22011-05-15 08:45:50 +1000897 options.request_tty = REQUEST_TTY_NO;
Damien Miller1383bd82000-04-06 12:32:37 +1000898 break;
Damien Miller1383bd82000-04-06 12:32:37 +1000899 case 'T':
Damien Miller21771e22011-05-15 08:45:50 +1000900 options.request_tty = REQUEST_TTY_NO;
Damien Miller1383bd82000-04-06 12:32:37 +1000901 break;
Damien Miller95def091999-11-25 00:26:21 +1100902 case 'o':
Damien Miller9836cf82003-12-17 16:30:06 +1100903 line = xstrdup(optarg);
djm@openbsd.org957fbce2014-10-08 22:20:25 +0000904 if (process_config_line(&options, pw,
905 host ? host : "", host ? host : "", line,
906 "command-line", 0, NULL, SSHCONF_USERCONF) != 0)
Darren Tuckere9a9b712005-12-20 16:15:51 +1100907 exit(255);
Darren Tuckera627d422013-06-02 07:31:17 +1000908 free(line);
Damien Miller95def091999-11-25 00:26:21 +1100909 break;
Damien Miller832562e2001-01-30 09:30:01 +1100910 case 's':
911 subsystem_flag = 1;
912 break;
Damien Miller0e220db2004-06-15 10:34:08 +1000913 case 'S':
mmcc@openbsd.orgd59ce082015-12-10 17:08:40 +0000914 free(options.control_path);
Damien Miller0e220db2004-06-15 10:34:08 +1000915 options.control_path = xstrdup(optarg);
Damien Miller0e220db2004-06-15 10:34:08 +1000916 break;
Ben Lindstrome0f88042001-04-30 13:06:24 +0000917 case 'b':
918 options.bind_address = optarg;
919 break;
Ben Lindstrom14f31ab2001-09-12 17:48:04 +0000920 case 'F':
921 config = optarg;
922 break;
Damien Miller95def091999-11-25 00:26:21 +1100923 default:
924 usage();
925 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000926 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000927
Damien Millerf4614452001-07-14 12:18:10 +1000928 ac -= optind;
929 av += optind;
930
Darren Tuckerb8c884a2010-01-08 18:53:43 +1100931 if (ac > 0 && !host) {
Ben Lindstromc276c122002-12-23 02:14:51 +0000932 if (strrchr(*av, '@')) {
Damien Millerf4614452001-07-14 12:18:10 +1000933 p = xstrdup(*av);
Ben Lindstromc276c122002-12-23 02:14:51 +0000934 cp = strrchr(p, '@');
Damien Millerf4614452001-07-14 12:18:10 +1000935 if (cp == NULL || cp == p)
936 usage();
937 options.user = p;
938 *cp = '\0';
Damien Miller0faf7472013-10-17 11:47:23 +1100939 host = xstrdup(++cp);
Damien Millerf4614452001-07-14 12:18:10 +1000940 } else
Damien Miller0faf7472013-10-17 11:47:23 +1100941 host = xstrdup(*av);
Ben Lindstromb9fa6912002-12-23 02:24:54 +0000942 if (ac > 1) {
943 optind = optreset = 1;
Damien Millerf4614452001-07-14 12:18:10 +1000944 goto again;
945 }
Ben Lindstromb9fa6912002-12-23 02:24:54 +0000946 ac--, av++;
Damien Millerf4614452001-07-14 12:18:10 +1000947 }
948
Damien Miller95def091999-11-25 00:26:21 +1100949 /* Check that we got a host name. */
950 if (!host)
951 usage();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000952
Damien Miller0faf7472013-10-17 11:47:23 +1100953 host_arg = xstrdup(host);
954
Damien Miller1f0311c2014-05-15 14:24:09 +1000955#ifdef WITH_OPENSSL
Damien Miller4314c2b2010-09-10 11:12:09 +1000956 OpenSSL_add_all_algorithms();
Damien Miller0bc1bd82000-11-13 22:57:25 +1100957 ERR_load_crypto_strings();
Damien Miller1f0311c2014-05-15 14:24:09 +1000958#endif
Damien Millercb5e44a2000-09-29 12:12:36 +1100959
Damien Miller95def091999-11-25 00:26:21 +1100960 /* Initialize the command to execute on remote host. */
961 buffer_init(&command);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000962
Damien Miller5428f641999-11-25 11:54:57 +1100963 /*
964 * Save the command to execute on the remote host in a buffer. There
965 * is no limit on the length of the command, except by the maximum
966 * packet size. Also sets the tty flag if there is no command.
967 */
Damien Millerf4614452001-07-14 12:18:10 +1000968 if (!ac) {
Damien Miller95def091999-11-25 00:26:21 +1100969 /* No command specified - execute shell on a tty. */
Damien Miller832562e2001-01-30 09:30:01 +1100970 if (subsystem_flag) {
Damien Millerf4614452001-07-14 12:18:10 +1000971 fprintf(stderr,
972 "You must specify a subsystem to invoke.\n");
Damien Miller832562e2001-01-30 09:30:01 +1100973 usage();
974 }
Damien Miller95def091999-11-25 00:26:21 +1100975 } else {
Damien Millerf4614452001-07-14 12:18:10 +1000976 /* A command has been specified. Store it into the buffer. */
977 for (i = 0; i < ac; i++) {
978 if (i)
Damien Miller95def091999-11-25 00:26:21 +1100979 buffer_append(&command, " ", 1);
980 buffer_append(&command, av[i], strlen(av[i]));
981 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000982 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000983
Damien Miller95def091999-11-25 00:26:21 +1100984 /* Cannot fork to background if no command. */
Darren Tuckerd6173c02008-06-13 04:52:53 +1000985 if (fork_after_authentication_flag && buffer_len(&command) == 0 &&
986 !no_shell_flag)
987 fatal("Cannot fork into background without a command "
988 "to execute.");
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000989
Ben Lindstrom8a432f52001-03-05 07:24:46 +0000990 /*
991 * Initialize "log" output. Since we are the client all output
Damien Miller03d4d7e2013-04-23 15:21:06 +1000992 * goes to stderr unless otherwise specified by -y or -E.
Ben Lindstrom8a432f52001-03-05 07:24:46 +0000993 */
Damien Miller03d4d7e2013-04-23 15:21:06 +1000994 if (use_syslog && logfile != NULL)
995 fatal("Can't specify both -y and -E");
dtucker@openbsd.org4f7cc2f2015-09-04 08:21:47 +0000996 if (logfile != NULL)
Damien Miller03d4d7e2013-04-23 15:21:06 +1000997 log_redirect_stderr_to(logfile);
Darren Tucker72efd742009-06-21 17:48:00 +1000998 log_init(argv0,
Darren Tuckerd6173c02008-06-13 04:52:53 +1000999 options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level,
Damien Millere272a5b2008-11-03 19:22:37 +11001000 SYSLOG_FACILITY_USER, !use_syslog);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001001
Damien Miller03d4d7e2013-04-23 15:21:06 +10001002 if (debug_flag)
Damien Miller1f0311c2014-05-15 14:24:09 +10001003 logit("%s, %s", SSH_RELEASE,
1004#ifdef WITH_OPENSSL
1005 SSLeay_version(SSLEAY_VERSION)
1006#else
1007 "without OpenSSL"
1008#endif
1009 );
Damien Miller03d4d7e2013-04-23 15:21:06 +10001010
Damien Miller13f97b22014-02-24 15:57:55 +11001011 /* Parse the configuration files */
djm@openbsd.org957fbce2014-10-08 22:20:25 +00001012 process_config_files(host_arg, pw, 0);
Ben Lindstrom83f07d12001-10-03 17:22:29 +00001013
Damien Miller13f97b22014-02-24 15:57:55 +11001014 /* Hostname canonicalisation needs a few options filled. */
1015 fill_default_options_for_canonicalization(&options);
1016
1017 /* If the user has replaced the hostname then take it into use now */
1018 if (options.hostname != NULL) {
1019 /* NB. Please keep in sync with readconf.c:match_cfg_line() */
1020 cp = percent_expand(options.hostname,
1021 "h", host, (char *)NULL);
1022 free(host);
1023 host = cp;
djm@openbsd.org957fbce2014-10-08 22:20:25 +00001024 free(options.hostname);
1025 options.hostname = xstrdup(host);
Damien Miller13f97b22014-02-24 15:57:55 +11001026 }
1027
1028 /* If canonicalization requested then try to apply it */
1029 lowercase(host);
1030 if (options.canonicalize_hostname != SSH_CANONICALISE_NO)
1031 addrs = resolve_canonicalize(&host, options.port);
1032
1033 /*
Damien Miller08b57c62014-02-27 10:17:13 +11001034 * If CanonicalizePermittedCNAMEs have been specified but
1035 * other canonicalization did not happen (by not being requested
1036 * or by failing with fallback) then the hostname may still be changed
1037 * as a result of CNAME following.
1038 *
1039 * Try to resolve the bare hostname name using the system resolver's
1040 * usual search rules and then apply the CNAME follow rules.
1041 *
1042 * Skip the lookup if a ProxyCommand is being used unless the user
1043 * has specifically requested canonicalisation for this case via
1044 * CanonicalizeHostname=always
Damien Miller13f97b22014-02-24 15:57:55 +11001045 */
Damien Miller08b57c62014-02-27 10:17:13 +11001046 if (addrs == NULL && options.num_permitted_cnames != 0 &&
1047 (option_clear_or_none(options.proxy_command) ||
Damien Miller13f97b22014-02-24 15:57:55 +11001048 options.canonicalize_hostname == SSH_CANONICALISE_ALWAYS)) {
Damien Miller19439e92014-07-02 15:28:40 +10001049 if ((addrs = resolve_host(host, options.port,
1050 option_clear_or_none(options.proxy_command),
1051 cname, sizeof(cname))) == NULL) {
1052 /* Don't fatal proxied host names not in the DNS */
1053 if (option_clear_or_none(options.proxy_command))
1054 cleanup_exit(255); /* logged in resolve_host */
1055 } else
1056 check_follow_cname(&host, cname);
Damien Miller13f97b22014-02-24 15:57:55 +11001057 }
1058
1059 /*
djm@openbsd.org957fbce2014-10-08 22:20:25 +00001060 * If canonicalisation is enabled then re-parse the configuration
1061 * files as new stanzas may match.
Damien Miller13f97b22014-02-24 15:57:55 +11001062 */
djm@openbsd.org957fbce2014-10-08 22:20:25 +00001063 if (options.canonicalize_hostname != 0) {
1064 debug("Re-reading configuration after hostname "
1065 "canonicalisation");
1066 free(options.hostname);
1067 options.hostname = xstrdup(host);
1068 process_config_files(host_arg, pw, 1);
1069 /*
1070 * Address resolution happens early with canonicalisation
1071 * enabled and the port number may have changed since, so
1072 * reset it in address list
1073 */
1074 if (addrs != NULL && options.port > 0)
1075 set_addrinfo_port(addrs, options.port);
Ben Lindstrom14f31ab2001-09-12 17:48:04 +00001076 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001077
Damien Miller95def091999-11-25 00:26:21 +11001078 /* Fill configuration defaults. */
1079 fill_default_options(&options);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001080
Damien Miller13f97b22014-02-24 15:57:55 +11001081 if (options.port == 0)
1082 options.port = default_ssh_port();
Darren Tucker0a4f04b2003-07-03 20:37:47 +10001083 channel_set_af(options.address_family);
1084
Damien Millere9fc72e2013-10-15 12:14:12 +11001085 /* Tidy and check options */
1086 if (options.host_key_alias != NULL)
1087 lowercase(options.host_key_alias);
1088 if (options.proxy_command != NULL &&
1089 strcmp(options.proxy_command, "-") == 0 &&
1090 options.proxy_use_fdpass)
1091 fatal("ProxyCommand=- and ProxyUseFDPass are incompatible");
djm@openbsd.org44732de2015-02-20 22:17:21 +00001092 if (options.control_persist &&
1093 options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK) {
1094 debug("UpdateHostKeys=ask is incompatible with ControlPersist; "
1095 "disabling");
1096 options.update_hostkeys = 0;
1097 }
djm@openbsd.org88b6fcd2015-11-19 08:23:27 +00001098 if (options.connection_attempts <= 0)
1099 fatal("Invalid number of ConnectionAttempts");
Damien Miller0faf7472013-10-17 11:47:23 +11001100#ifndef HAVE_CYGWIN
1101 if (original_effective_uid != 0)
1102 options.use_privileged_port = 0;
1103#endif
Damien Millere9fc72e2013-10-15 12:14:12 +11001104
Damien Miller95def091999-11-25 00:26:21 +11001105 /* reinit */
Darren Tucker72efd742009-06-21 17:48:00 +10001106 log_init(argv0, options.log_level, SYSLOG_FACILITY_USER, !use_syslog);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001107
Damien Millerfff9f092012-07-06 13:45:01 +10001108 if (options.request_tty == REQUEST_TTY_YES ||
1109 options.request_tty == REQUEST_TTY_FORCE)
1110 tty_flag = 1;
1111
1112 /* Allocate a tty by default if no command specified. */
1113 if (buffer_len(&command) == 0)
1114 tty_flag = options.request_tty != REQUEST_TTY_NO;
1115
1116 /* Force no tty */
1117 if (options.request_tty == REQUEST_TTY_NO || muxclient_command != 0)
1118 tty_flag = 0;
1119 /* Do not allocate a tty if stdin is not a tty. */
1120 if ((!isatty(fileno(stdin)) || stdin_null_flag) &&
1121 options.request_tty != REQUEST_TTY_FORCE) {
1122 if (tty_flag)
1123 logit("Pseudo-terminal will not be allocated because "
1124 "stdin is not a terminal.");
1125 tty_flag = 0;
1126 }
1127
Damien Miller60bc5172001-03-19 09:38:15 +11001128 seed_rng();
1129
Damien Miller95def091999-11-25 00:26:21 +11001130 if (options.user == NULL)
1131 options.user = xstrdup(pw->pw_name);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001132
Damien Millerdfc85fa2011-05-15 08:44:02 +10001133 if (gethostname(thishost, sizeof(thishost)) == -1)
1134 fatal("gethostname: %s", strerror(errno));
1135 strlcpy(shorthost, thishost, sizeof(shorthost));
1136 shorthost[strcspn(thishost, ".")] = '\0';
1137 snprintf(portstr, sizeof(portstr), "%d", options.port);
djm@openbsd.org674b3b62015-09-11 03:47:28 +00001138 snprintf(uidstr, sizeof(uidstr), "%d", pw->pw_uid);
Darren Tuckerf6b01b72008-06-13 04:56:37 +10001139
Damien Miller9c386432014-07-03 21:27:46 +10001140 if ((md = ssh_digest_start(SSH_DIGEST_SHA1)) == NULL ||
1141 ssh_digest_update(md, thishost, strlen(thishost)) < 0 ||
1142 ssh_digest_update(md, host, strlen(host)) < 0 ||
1143 ssh_digest_update(md, portstr, strlen(portstr)) < 0 ||
1144 ssh_digest_update(md, options.user, strlen(options.user)) < 0 ||
1145 ssh_digest_final(md, conn_hash, sizeof(conn_hash)) < 0)
1146 fatal("%s: mux digest failed", __func__);
1147 ssh_digest_free(md);
1148 conn_hash_hex = tohex(conn_hash, ssh_digest_bytes(SSH_DIGEST_SHA1));
1149
Damien Millerdfc85fa2011-05-15 08:44:02 +10001150 if (options.local_command != NULL) {
Darren Tuckerf6b01b72008-06-13 04:56:37 +10001151 debug3("expanding LocalCommand: %s", options.local_command);
1152 cp = options.local_command;
Damien Miller9c386432014-07-03 21:27:46 +10001153 options.local_command = percent_expand(cp,
1154 "C", conn_hash_hex,
1155 "L", shorthost,
1156 "d", pw->pw_dir,
1157 "h", host,
1158 "l", thishost,
1159 "n", host_arg,
1160 "p", portstr,
1161 "r", options.user,
1162 "u", pw->pw_name,
Damien Millerdfc85fa2011-05-15 08:44:02 +10001163 (char *)NULL);
Darren Tuckerf6b01b72008-06-13 04:56:37 +10001164 debug3("expanded LocalCommand: %s", options.local_command);
Darren Tuckera627d422013-06-02 07:31:17 +10001165 free(cp);
Darren Tuckerf6b01b72008-06-13 04:56:37 +10001166 }
1167
Damien Miller0e220db2004-06-15 10:34:08 +10001168 if (options.control_path != NULL) {
Damien Miller6476cad2005-06-16 13:18:34 +10001169 cp = tilde_expand_filename(options.control_path,
1170 original_real_uid);
Darren Tuckera627d422013-06-02 07:31:17 +10001171 free(options.control_path);
Damien Miller9c386432014-07-03 21:27:46 +10001172 options.control_path = percent_expand(cp,
1173 "C", conn_hash_hex,
1174 "L", shorthost,
1175 "h", host,
1176 "l", thishost,
1177 "n", host_arg,
1178 "p", portstr,
1179 "r", options.user,
1180 "u", pw->pw_name,
djm@openbsd.org674b3b62015-09-11 03:47:28 +00001181 "i", uidstr,
Damien Millerdfc85fa2011-05-15 08:44:02 +10001182 (char *)NULL);
Darren Tuckera627d422013-06-02 07:31:17 +10001183 free(cp);
Damien Miller0e220db2004-06-15 10:34:08 +10001184 }
Damien Miller9c386432014-07-03 21:27:46 +10001185 free(conn_hash_hex);
1186
djm@openbsd.org957fbce2014-10-08 22:20:25 +00001187 if (config_test) {
1188 dump_client_config(&options, host);
1189 exit(0);
1190 }
1191
Damien Millerb1cbfa22008-05-19 16:00:08 +10001192 if (muxclient_command != 0 && options.control_path == NULL)
Darren Tucker0814d312005-06-01 23:08:51 +10001193 fatal("No ControlPath specified for \"-O\" command");
Damien Millerd14b1e72005-06-16 13:19:41 +10001194 if (options.control_path != NULL)
Damien Millerb1cbfa22008-05-19 16:00:08 +10001195 muxclient(options.control_path);
Damien Miller0e220db2004-06-15 10:34:08 +10001196
Damien Miller08b57c62014-02-27 10:17:13 +11001197 /*
1198 * If hostname canonicalisation was not enabled, then we may not
1199 * have yet resolved the hostname. Do so now.
1200 */
1201 if (addrs == NULL && options.proxy_command == NULL) {
djm@openbsd.orga85768a2015-09-04 04:56:09 +00001202 debug2("resolving \"%s\" port %d", host, options.port);
Damien Miller08b57c62014-02-27 10:17:13 +11001203 if ((addrs = resolve_host(host, options.port, 1,
1204 cname, sizeof(cname))) == NULL)
1205 cleanup_exit(255); /* resolve_host logs the error */
1206 }
1207
Damien Miller67bd0622007-09-17 12:06:57 +10001208 timeout_ms = options.connection_timeout * 1000;
1209
Kevin Stevesfcec7f82000-12-15 19:55:48 +00001210 /* Open a connection to the remote host. */
Damien Miller0faf7472013-10-17 11:47:23 +11001211 if (ssh_connect(host, addrs, &hostaddr, options.port,
1212 options.address_family, options.connection_attempts,
1213 &timeout_ms, options.tcp_keep_alive,
1214 options.use_privileged_port) != 0)
1215 exit(255);
1216
Damien Miller28631ce2013-10-26 10:07:56 +11001217 if (addrs != NULL)
1218 freeaddrinfo(addrs);
1219
Damien Miller0faf7472013-10-17 11:47:23 +11001220 packet_set_timeout(options.server_alive_interval,
1221 options.server_alive_count_max);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001222
Damien Miller67bd0622007-09-17 12:06:57 +10001223 if (timeout_ms > 0)
1224 debug3("timeout: %d ms remain after connect", timeout_ms);
1225
Damien Miller5428f641999-11-25 11:54:57 +11001226 /*
1227 * If we successfully made the connection, load the host private key
1228 * in case we will need it later for combined rsa-rhosts
1229 * authentication. This must be done before releasing extra
1230 * privileges, because the file is only readable by root.
Ben Lindstrom9e5bb572002-06-06 19:58:27 +00001231 * If we cannot access the private keys, load the public keys
1232 * instead and try to execute the ssh-keysign helper instead.
Damien Miller5428f641999-11-25 11:54:57 +11001233 */
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001234 sensitive_data.nkeys = 0;
1235 sensitive_data.keys = NULL;
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001236 sensitive_data.external_keysign = 0;
Ben Lindstrom24157572002-06-12 16:09:39 +00001237 if (options.rhosts_rsa_authentication ||
1238 options.hostbased_authentication) {
Damien Miller0fa47cf2013-12-29 17:53:39 +11001239 sensitive_data.nkeys = 9;
Damien Millerddd63ab2006-03-31 23:10:51 +11001240 sensitive_data.keys = xcalloc(sensitive_data.nkeys,
Ben Lindstroma962c2f2002-07-04 00:14:17 +00001241 sizeof(Key));
Damien Miller6af914a2010-09-10 11:39:26 +10001242 for (i = 0; i < sensitive_data.nkeys; i++)
1243 sensitive_data.keys[i] = NULL;
Ben Lindstromf9c48842002-06-11 16:37:51 +00001244
1245 PRIV_START;
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001246 sensitive_data.keys[0] = key_load_private_type(KEY_RSA1,
Darren Tucker232b76f2006-05-06 17:41:51 +10001247 _PATH_HOST_KEY_FILE, "", NULL, NULL);
Damien Miller6af914a2010-09-10 11:39:26 +10001248#ifdef OPENSSL_HAS_ECC
djm@openbsd.orgab24ab82015-01-08 10:15:45 +00001249 sensitive_data.keys[1] = key_load_private_cert(KEY_ECDSA,
Damien Millereb8b60e2010-08-31 22:41:14 +10001250 _PATH_HOST_ECDSA_KEY_FILE, "", NULL);
Damien Miller6af914a2010-09-10 11:39:26 +10001251#endif
djm@openbsd.orgab24ab82015-01-08 10:15:45 +00001252 sensitive_data.keys[2] = key_load_private_cert(KEY_ED25519,
1253 _PATH_HOST_ED25519_KEY_FILE, "", NULL);
Damien Millereb8b60e2010-08-31 22:41:14 +10001254 sensitive_data.keys[3] = key_load_private_cert(KEY_RSA,
Damien Millerc1583312010-08-05 13:04:50 +10001255 _PATH_HOST_RSA_KEY_FILE, "", NULL);
djm@openbsd.orgab24ab82015-01-08 10:15:45 +00001256 sensitive_data.keys[4] = key_load_private_cert(KEY_DSA,
1257 _PATH_HOST_DSA_KEY_FILE, "", NULL);
Damien Miller6af914a2010-09-10 11:39:26 +10001258#ifdef OPENSSL_HAS_ECC
djm@openbsd.orgab24ab82015-01-08 10:15:45 +00001259 sensitive_data.keys[5] = key_load_private_type(KEY_ECDSA,
Damien Millereb8b60e2010-08-31 22:41:14 +10001260 _PATH_HOST_ECDSA_KEY_FILE, "", NULL, NULL);
Damien Miller6af914a2010-09-10 11:39:26 +10001261#endif
djm@openbsd.orgab24ab82015-01-08 10:15:45 +00001262 sensitive_data.keys[6] = key_load_private_type(KEY_ED25519,
1263 _PATH_HOST_ED25519_KEY_FILE, "", NULL, NULL);
Damien Miller0fa47cf2013-12-29 17:53:39 +11001264 sensitive_data.keys[7] = key_load_private_type(KEY_RSA,
Darren Tucker232b76f2006-05-06 17:41:51 +10001265 _PATH_HOST_RSA_KEY_FILE, "", NULL, NULL);
djm@openbsd.orgab24ab82015-01-08 10:15:45 +00001266 sensitive_data.keys[8] = key_load_private_type(KEY_DSA,
1267 _PATH_HOST_DSA_KEY_FILE, "", NULL, NULL);
Ben Lindstromf9c48842002-06-11 16:37:51 +00001268 PRIV_END;
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001269
Ben Lindstrom5d35a2f2002-07-04 00:19:40 +00001270 if (options.hostbased_authentication == 1 &&
1271 sensitive_data.keys[0] == NULL &&
Damien Millereb8b60e2010-08-31 22:41:14 +10001272 sensitive_data.keys[5] == NULL &&
Damien Miller5be9d9e2013-12-07 11:24:01 +11001273 sensitive_data.keys[6] == NULL &&
Damien Miller0fa47cf2013-12-29 17:53:39 +11001274 sensitive_data.keys[7] == NULL &&
1275 sensitive_data.keys[8] == NULL) {
Damien Miller6af914a2010-09-10 11:39:26 +10001276#ifdef OPENSSL_HAS_ECC
djm@openbsd.orgab24ab82015-01-08 10:15:45 +00001277 sensitive_data.keys[1] = key_load_cert(
Damien Millereb8b60e2010-08-31 22:41:14 +10001278 _PATH_HOST_ECDSA_KEY_FILE);
Damien Miller6af914a2010-09-10 11:39:26 +10001279#endif
djm@openbsd.orgab24ab82015-01-08 10:15:45 +00001280 sensitive_data.keys[2] = key_load_cert(
1281 _PATH_HOST_ED25519_KEY_FILE);
Damien Millereb8b60e2010-08-31 22:41:14 +10001282 sensitive_data.keys[3] = key_load_cert(
Damien Millerc1583312010-08-05 13:04:50 +10001283 _PATH_HOST_RSA_KEY_FILE);
Damien Miller0fa47cf2013-12-29 17:53:39 +11001284 sensitive_data.keys[4] = key_load_cert(
djm@openbsd.orgab24ab82015-01-08 10:15:45 +00001285 _PATH_HOST_DSA_KEY_FILE);
Damien Miller6af914a2010-09-10 11:39:26 +10001286#ifdef OPENSSL_HAS_ECC
djm@openbsd.orgab24ab82015-01-08 10:15:45 +00001287 sensitive_data.keys[5] = key_load_public(
Damien Millereb8b60e2010-08-31 22:41:14 +10001288 _PATH_HOST_ECDSA_KEY_FILE, NULL);
Damien Miller6af914a2010-09-10 11:39:26 +10001289#endif
djm@openbsd.orgab24ab82015-01-08 10:15:45 +00001290 sensitive_data.keys[6] = key_load_public(
1291 _PATH_HOST_ED25519_KEY_FILE, NULL);
Damien Miller5be9d9e2013-12-07 11:24:01 +11001292 sensitive_data.keys[7] = key_load_public(
Damien Miller0fa47cf2013-12-29 17:53:39 +11001293 _PATH_HOST_RSA_KEY_FILE, NULL);
1294 sensitive_data.keys[8] = key_load_public(
djm@openbsd.orgab24ab82015-01-08 10:15:45 +00001295 _PATH_HOST_DSA_KEY_FILE, NULL);
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001296 sensitive_data.external_keysign = 1;
1297 }
Damien Miller95def091999-11-25 00:26:21 +11001298 }
Damien Miller5428f641999-11-25 11:54:57 +11001299 /*
1300 * Get rid of any extra privileges that we may have. We will no
1301 * longer need them. Also, extra privileges could make it very hard
1302 * to read identity files and other non-world-readable files from the
1303 * user's home directory if it happens to be on a NFS volume where
1304 * root is mapped to nobody.
1305 */
Darren Tucker25f60a72004-08-15 17:23:34 +10001306 if (original_effective_uid == 0) {
1307 PRIV_START;
1308 permanently_set_uid(pw);
1309 }
Damien Miller95def091999-11-25 00:26:21 +11001310
Damien Miller5428f641999-11-25 11:54:57 +11001311 /*
1312 * Now that we are back to our own permissions, create ~/.ssh
Damien Miller788f2122005-11-05 15:14:59 +11001313 * directory if it doesn't already exist.
Damien Miller5428f641999-11-25 11:54:57 +11001314 */
Darren Tucker45c66d72011-11-04 10:50:40 +11001315 if (config == NULL) {
1316 r = snprintf(buf, sizeof buf, "%s%s%s", pw->pw_dir,
1317 strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR);
1318 if (r > 0 && (size_t)r < sizeof(buf) && stat(buf, &st) < 0) {
Darren Tucker8ccb7392010-09-10 12:28:24 +10001319#ifdef WITH_SELINUX
Darren Tucker45c66d72011-11-04 10:50:40 +11001320 ssh_selinux_setfscreatecon(buf);
Darren Tucker8ccb7392010-09-10 12:28:24 +10001321#endif
Darren Tucker45c66d72011-11-04 10:50:40 +11001322 if (mkdir(buf, 0700) < 0)
1323 error("Could not create directory '%.200s'.",
1324 buf);
Darren Tucker8ccb7392010-09-10 12:28:24 +10001325#ifdef WITH_SELINUX
Darren Tucker45c66d72011-11-04 10:50:40 +11001326 ssh_selinux_setfscreatecon(NULL);
Darren Tucker8ccb7392010-09-10 12:28:24 +10001327#endif
Darren Tucker45c66d72011-11-04 10:50:40 +11001328 }
Darren Tucker8ccb7392010-09-10 12:28:24 +10001329 }
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001330 /* load options.identity_files */
1331 load_public_identity_files();
1332
1333 /* Expand ~ in known host file names. */
Damien Miller295ee632011-05-29 21:42:31 +10001334 tilde_expand_paths(options.system_hostfiles,
1335 options.num_system_hostfiles);
1336 tilde_expand_paths(options.user_hostfiles, options.num_user_hostfiles);
Damien Miller95def091999-11-25 00:26:21 +11001337
Damien Miller07cd5892001-11-12 10:52:03 +11001338 signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
Damien Miller857b02e2010-09-24 22:02:56 +10001339 signal(SIGCHLD, main_sigchld_handler);
Damien Miller07cd5892001-11-12 10:52:03 +11001340
Darren Tuckerd6173c02008-06-13 04:52:53 +10001341 /* Log into the remote system. Never returns if the login fails. */
Damien Miller67bd0622007-09-17 12:06:57 +10001342 ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr,
Damien Millerd925dcd2010-12-01 12:21:51 +11001343 options.port, pw, timeout_ms);
Damien Miller95def091999-11-25 00:26:21 +11001344
Damien Miller383ffe62010-06-26 10:02:03 +10001345 if (packet_connection_is_on_socket()) {
1346 verbose("Authenticated to %s ([%s]:%d).", host,
1347 get_remote_ipaddr(), get_remote_port());
1348 } else {
1349 verbose("Authenticated to %s (via proxy).", host);
1350 }
1351
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001352 /* We no longer need the private host keys. Clear them now. */
1353 if (sensitive_data.nkeys != 0) {
1354 for (i = 0; i < sensitive_data.nkeys; i++) {
1355 if (sensitive_data.keys[i] != NULL) {
1356 /* Destroys contents safely */
1357 debug3("clear hostkey %d", i);
1358 key_free(sensitive_data.keys[i]);
1359 sensitive_data.keys[i] = NULL;
1360 }
1361 }
Darren Tuckera627d422013-06-02 07:31:17 +10001362 free(sensitive_data.keys);
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001363 }
Ben Lindstroma6c8a8d2001-08-06 21:42:00 +00001364 for (i = 0; i < options.num_identity_files; i++) {
Darren Tuckera627d422013-06-02 07:31:17 +10001365 free(options.identity_files[i]);
1366 options.identity_files[i] = NULL;
Ben Lindstroma6c8a8d2001-08-06 21:42:00 +00001367 if (options.identity_keys[i]) {
1368 key_free(options.identity_keys[i]);
1369 options.identity_keys[i] = NULL;
1370 }
1371 }
djm@openbsd.org4e44a792015-09-24 06:15:11 +00001372 for (i = 0; i < options.num_certificate_files; i++) {
1373 free(options.certificate_files[i]);
1374 options.certificate_files[i] = NULL;
1375 }
Damien Miller95def091999-11-25 00:26:21 +11001376
Damien Miller1383bd82000-04-06 12:32:37 +10001377 exit_status = compat20 ? ssh_session2() : ssh_session();
1378 packet_close();
Damien Miller8c4e18a2002-09-19 12:05:02 +10001379
Damien Millerb1cbfa22008-05-19 16:00:08 +10001380 if (options.control_path != NULL && muxserver_sock != -1)
Damien Miller0e220db2004-06-15 10:34:08 +10001381 unlink(options.control_path);
1382
Damien Millera41ccca2010-10-07 22:07:32 +11001383 /* Kill ProxyCommand if it is running. */
1384 ssh_kill_proxy_command();
Damien Miller8c4e18a2002-09-19 12:05:02 +10001385
Damien Miller1383bd82000-04-06 12:32:37 +10001386 return exit_status;
1387}
1388
Damien Millere11e1ea2010-08-03 16:04:46 +10001389static void
1390control_persist_detach(void)
1391{
1392 pid_t pid;
Damien Miller00d9ae22010-08-17 01:59:31 +10001393 int devnull;
Damien Millere11e1ea2010-08-03 16:04:46 +10001394
1395 debug("%s: backgrounding master process", __func__);
1396
1397 /*
1398 * master (current process) into the background, and make the
1399 * foreground process a client of the backgrounded master.
1400 */
1401 switch ((pid = fork())) {
1402 case -1:
1403 fatal("%s: fork: %s", __func__, strerror(errno));
1404 case 0:
1405 /* Child: master process continues mainloop */
1406 break;
1407 default:
1408 /* Parent: set up mux slave to connect to backgrounded master */
1409 debug2("%s: background process is %ld", __func__, (long)pid);
1410 stdin_null_flag = ostdin_null_flag;
Damien Miller21771e22011-05-15 08:45:50 +10001411 options.request_tty = orequest_tty;
Damien Millere11e1ea2010-08-03 16:04:46 +10001412 tty_flag = otty_flag;
1413 close(muxserver_sock);
1414 muxserver_sock = -1;
Damien Miller5929c522010-09-10 11:17:02 +10001415 options.control_master = SSHCTL_MASTER_NO;
Damien Millere11e1ea2010-08-03 16:04:46 +10001416 muxclient(options.control_path);
1417 /* muxclient() doesn't return on success. */
1418 fatal("Failed to connect to new control master");
1419 }
Damien Miller00d9ae22010-08-17 01:59:31 +10001420 if ((devnull = open(_PATH_DEVNULL, O_RDWR)) == -1) {
1421 error("%s: open(\"/dev/null\"): %s", __func__,
1422 strerror(errno));
1423 } else {
1424 if (dup2(devnull, STDIN_FILENO) == -1 ||
1425 dup2(devnull, STDOUT_FILENO) == -1)
1426 error("%s: dup2: %s", __func__, strerror(errno));
1427 if (devnull > STDERR_FILENO)
1428 close(devnull);
1429 }
Damien Miller98e27dc2013-07-25 11:55:52 +10001430 daemon(1, 1);
Damien Millerea2c1a42011-06-03 12:10:22 +10001431 setproctitle("%s [mux]", options.control_path);
Damien Millere11e1ea2010-08-03 16:04:46 +10001432}
1433
1434/* Do fork() after authentication. Used by "ssh -f" */
1435static void
1436fork_postauth(void)
1437{
1438 if (need_controlpersist_detach)
1439 control_persist_detach();
1440 debug("forking to background");
1441 fork_after_authentication_flag = 0;
1442 if (daemon(1, 1) < 0)
1443 fatal("daemon() failed: %.200s", strerror(errno));
1444}
1445
Darren Tucker9f407c42008-06-13 04:50:27 +10001446/* Callback for remote forward global requests */
1447static void
1448ssh_confirm_remote_forward(int type, u_int32_t seq, void *ctxt)
1449{
Damien Miller7acefbb2014-07-18 14:11:24 +10001450 struct Forward *rfwd = (struct Forward *)ctxt;
Darren Tucker9f407c42008-06-13 04:50:27 +10001451
Damien Miller4bf648f2009-02-14 16:28:21 +11001452 /* XXX verbose() on failure? */
Damien Miller4b3ed642014-07-02 15:29:40 +10001453 debug("remote forward %s for: listen %s%s%d, connect %s:%d",
Darren Tucker9f407c42008-06-13 04:50:27 +10001454 type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
Damien Miller7acefbb2014-07-18 14:11:24 +10001455 rfwd->listen_path ? rfwd->listen_path :
1456 rfwd->listen_host ? rfwd->listen_host : "",
1457 (rfwd->listen_path || rfwd->listen_host) ? ":" : "",
1458 rfwd->listen_port, rfwd->connect_path ? rfwd->connect_path :
1459 rfwd->connect_host, rfwd->connect_port);
1460 if (rfwd->listen_path == NULL && rfwd->listen_port == 0) {
Darren Tucker68afb8c2011-10-02 18:59:03 +11001461 if (type == SSH2_MSG_REQUEST_SUCCESS) {
1462 rfwd->allocated_port = packet_get_int();
1463 logit("Allocated port %u for remote forward to %s:%d",
1464 rfwd->allocated_port,
1465 rfwd->connect_host, rfwd->connect_port);
1466 channel_update_permitted_opens(rfwd->handle,
1467 rfwd->allocated_port);
1468 } else {
1469 channel_update_permitted_opens(rfwd->handle, -1);
1470 }
Damien Miller4bf648f2009-02-14 16:28:21 +11001471 }
1472
Darren Tucker9f407c42008-06-13 04:50:27 +10001473 if (type == SSH2_MSG_REQUEST_FAILURE) {
Damien Miller7acefbb2014-07-18 14:11:24 +10001474 if (options.exit_on_forward_failure) {
1475 if (rfwd->listen_path != NULL)
1476 fatal("Error: remote port forwarding failed "
1477 "for listen path %s", rfwd->listen_path);
1478 else
1479 fatal("Error: remote port forwarding failed "
1480 "for listen port %d", rfwd->listen_port);
1481 } else {
1482 if (rfwd->listen_path != NULL)
1483 logit("Warning: remote port forwarding failed "
1484 "for listen path %s", rfwd->listen_path);
1485 else
1486 logit("Warning: remote port forwarding failed "
1487 "for listen port %d", rfwd->listen_port);
1488 }
Darren Tucker9f407c42008-06-13 04:50:27 +10001489 }
Darren Tucker9a2a6092008-07-04 12:53:50 +10001490 if (++remote_forward_confirms_received == options.num_remote_forwards) {
Darren Tucker9f407c42008-06-13 04:50:27 +10001491 debug("All remote forwarding requests processed");
Damien Millere11e1ea2010-08-03 16:04:46 +10001492 if (fork_after_authentication_flag)
1493 fork_postauth();
Darren Tucker9a2a6092008-07-04 12:53:50 +10001494 }
Darren Tucker9f407c42008-06-13 04:50:27 +10001495}
1496
Ben Lindstrombba81212001-06-25 05:01:22 +00001497static void
Darren Tucker7ad8dd22010-01-12 19:40:27 +11001498client_cleanup_stdio_fwd(int id, void *arg)
1499{
1500 debug("stdio forwarding: done");
1501 cleanup_exit(0);
1502}
1503
Darren Tucker2d6665d2011-11-04 10:54:22 +11001504static void
Damien Miller357610d2014-07-18 15:04:10 +10001505ssh_stdio_confirm(int id, int success, void *arg)
1506{
1507 if (!success)
1508 fatal("stdio forwarding failed");
1509}
1510
1511static void
Darren Tucker2d6665d2011-11-04 10:54:22 +11001512ssh_init_stdio_forwarding(void)
Darren Tucker7ad8dd22010-01-12 19:40:27 +11001513{
1514 Channel *c;
Damien Millere1537f92010-01-26 13:26:22 +11001515 int in, out;
Darren Tucker7ad8dd22010-01-12 19:40:27 +11001516
Darren Tucker2d6665d2011-11-04 10:54:22 +11001517 if (stdio_forward_host == NULL)
1518 return;
Damien Miller386feab2013-10-15 12:14:49 +11001519 if (!compat20)
Darren Tucker2d6665d2011-11-04 10:54:22 +11001520 fatal("stdio forwarding require Protocol 2");
Damien Millere1537f92010-01-26 13:26:22 +11001521
Darren Tucker2d6665d2011-11-04 10:54:22 +11001522 debug3("%s: %s:%d", __func__, stdio_forward_host, stdio_forward_port);
1523
1524 if ((in = dup(STDIN_FILENO)) < 0 ||
1525 (out = dup(STDOUT_FILENO)) < 0)
Damien Millere1537f92010-01-26 13:26:22 +11001526 fatal("channel_connect_stdio_fwd: dup() in/out failed");
Darren Tucker2d6665d2011-11-04 10:54:22 +11001527 if ((c = channel_connect_stdio_fwd(stdio_forward_host,
1528 stdio_forward_port, in, out)) == NULL)
1529 fatal("%s: channel_connect_stdio_fwd failed", __func__);
Darren Tucker7ad8dd22010-01-12 19:40:27 +11001530 channel_register_cleanup(c->self, client_cleanup_stdio_fwd, 0);
Damien Miller357610d2014-07-18 15:04:10 +10001531 channel_register_open_confirm(c->self, ssh_stdio_confirm, NULL);
Darren Tucker7ad8dd22010-01-12 19:40:27 +11001532}
1533
1534static void
Damien Miller0bc1bd82000-11-13 22:57:25 +11001535ssh_init_forwarding(void)
1536{
Kevin Steves12057502001-02-05 14:54:34 +00001537 int success = 0;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001538 int i;
Kevin Steves12057502001-02-05 14:54:34 +00001539
Damien Miller0bc1bd82000-11-13 22:57:25 +11001540 /* Initiate local TCP/IP port forwardings. */
1541 for (i = 0; i < options.num_local_forwards; i++) {
Damien Millerf91ee4c2005-03-01 21:24:33 +11001542 debug("Local connections to %.200s:%d forwarded to remote "
1543 "address %.200s:%d",
Damien Miller7acefbb2014-07-18 14:11:24 +10001544 (options.local_forwards[i].listen_path != NULL) ?
1545 options.local_forwards[i].listen_path :
Darren Tucker47eede72005-03-14 23:08:12 +11001546 (options.local_forwards[i].listen_host == NULL) ?
Damien Miller7acefbb2014-07-18 14:11:24 +10001547 (options.fwd_opts.gateway_ports ? "*" : "LOCALHOST") :
Damien Millerf91ee4c2005-03-01 21:24:33 +11001548 options.local_forwards[i].listen_host,
1549 options.local_forwards[i].listen_port,
Damien Miller7acefbb2014-07-18 14:11:24 +10001550 (options.local_forwards[i].connect_path != NULL) ?
1551 options.local_forwards[i].connect_path :
Damien Millerf91ee4c2005-03-01 21:24:33 +11001552 options.local_forwards[i].connect_host,
1553 options.local_forwards[i].connect_port);
Damien Millerb16461c2002-01-22 23:29:22 +11001554 success += channel_setup_local_fwd_listener(
Damien Miller7acefbb2014-07-18 14:11:24 +10001555 &options.local_forwards[i], &options.fwd_opts);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001556 }
Darren Tuckere7d4b192006-07-12 22:17:10 +10001557 if (i > 0 && success != i && options.exit_on_forward_failure)
1558 fatal("Could not request local forwarding.");
Kevin Steves12057502001-02-05 14:54:34 +00001559 if (i > 0 && success == 0)
1560 error("Could not request local forwarding.");
Damien Miller0bc1bd82000-11-13 22:57:25 +11001561
1562 /* Initiate remote TCP/IP port forwardings. */
1563 for (i = 0; i < options.num_remote_forwards; i++) {
Damien Millerf91ee4c2005-03-01 21:24:33 +11001564 debug("Remote connections from %.200s:%d forwarded to "
1565 "local address %.200s:%d",
Damien Miller7acefbb2014-07-18 14:11:24 +10001566 (options.remote_forwards[i].listen_path != NULL) ?
1567 options.remote_forwards[i].listen_path :
Damien Miller46d38de2005-07-17 17:02:09 +10001568 (options.remote_forwards[i].listen_host == NULL) ?
Damien Milleraa3bb102005-11-05 15:12:59 +11001569 "LOCALHOST" : options.remote_forwards[i].listen_host,
Damien Millerf91ee4c2005-03-01 21:24:33 +11001570 options.remote_forwards[i].listen_port,
Damien Miller7acefbb2014-07-18 14:11:24 +10001571 (options.remote_forwards[i].connect_path != NULL) ?
1572 options.remote_forwards[i].connect_path :
Damien Millerf91ee4c2005-03-01 21:24:33 +11001573 options.remote_forwards[i].connect_host,
1574 options.remote_forwards[i].connect_port);
Darren Tucker68afb8c2011-10-02 18:59:03 +11001575 options.remote_forwards[i].handle =
1576 channel_request_remote_forwarding(
Damien Miller7acefbb2014-07-18 14:11:24 +10001577 &options.remote_forwards[i]);
Darren Tucker68afb8c2011-10-02 18:59:03 +11001578 if (options.remote_forwards[i].handle < 0) {
Darren Tuckere7d4b192006-07-12 22:17:10 +10001579 if (options.exit_on_forward_failure)
1580 fatal("Could not request remote forwarding.");
1581 else
1582 logit("Warning: Could not request remote "
1583 "forwarding.");
Darren Tucker68afb8c2011-10-02 18:59:03 +11001584 } else {
1585 client_register_global_confirm(ssh_confirm_remote_forward,
1586 &options.remote_forwards[i]);
Darren Tuckere7d4b192006-07-12 22:17:10 +10001587 }
Damien Miller0bc1bd82000-11-13 22:57:25 +11001588 }
Damien Millerb3ce9fe2007-08-08 14:32:41 +10001589
1590 /* Initiate tunnel forwarding. */
1591 if (options.tun_open != SSH_TUNMODE_NO) {
1592 if (client_request_tun_fwd(options.tun_open,
1593 options.tun_local, options.tun_remote) == -1) {
1594 if (options.exit_on_forward_failure)
1595 fatal("Could not request tunnel forwarding.");
1596 else
1597 error("Could not request tunnel forwarding.");
1598 }
1599 }
Damien Miller0bc1bd82000-11-13 22:57:25 +11001600}
1601
Ben Lindstrombba81212001-06-25 05:01:22 +00001602static void
Damien Miller0bc1bd82000-11-13 22:57:25 +11001603check_agent_present(void)
1604{
djm@openbsd.org141efe42015-01-14 20:05:27 +00001605 int r;
1606
Damien Miller0bc1bd82000-11-13 22:57:25 +11001607 if (options.forward_agent) {
Damien Miller788f2122005-11-05 15:14:59 +11001608 /* Clear agent forwarding if we don't have an agent. */
djm@openbsd.org141efe42015-01-14 20:05:27 +00001609 if ((r = ssh_get_authentication_socket(NULL)) != 0) {
Damien Miller0bc1bd82000-11-13 22:57:25 +11001610 options.forward_agent = 0;
djm@openbsd.org141efe42015-01-14 20:05:27 +00001611 if (r != SSH_ERR_AGENT_NOT_PRESENT)
1612 debug("ssh_get_authentication_socket: %s",
1613 ssh_err(r));
1614 }
Damien Miller0bc1bd82000-11-13 22:57:25 +11001615 }
1616}
1617
Ben Lindstrombba81212001-06-25 05:01:22 +00001618static int
Damien Miller1383bd82000-04-06 12:32:37 +10001619ssh_session(void)
1620{
1621 int type;
Damien Miller1383bd82000-04-06 12:32:37 +10001622 int interactive = 0;
1623 int have_tty = 0;
1624 struct winsize ws;
Damien Miller1383bd82000-04-06 12:32:37 +10001625 char *cp;
Damien Miller17e7ed02005-06-17 12:54:33 +10001626 const char *display;
Damien Miller1383bd82000-04-06 12:32:37 +10001627
Damien Miller95def091999-11-25 00:26:21 +11001628 /* Enable compression if requested. */
1629 if (options.compression) {
Darren Tuckerd6173c02008-06-13 04:52:53 +10001630 debug("Requesting compression at level %d.",
1631 options.compression_level);
Damien Miller95def091999-11-25 00:26:21 +11001632
Darren Tuckerd6173c02008-06-13 04:52:53 +10001633 if (options.compression_level < 1 ||
1634 options.compression_level > 9)
1635 fatal("Compression level must be from 1 (fast) to "
1636 "9 (slow, best).");
Damien Miller95def091999-11-25 00:26:21 +11001637
1638 /* Send the request. */
1639 packet_start(SSH_CMSG_REQUEST_COMPRESSION);
1640 packet_put_int(options.compression_level);
1641 packet_send();
1642 packet_write_wait();
Damien Millerdff50992002-01-22 23:16:32 +11001643 type = packet_read();
Damien Miller95def091999-11-25 00:26:21 +11001644 if (type == SSH_SMSG_SUCCESS)
1645 packet_start_compression(options.compression_level);
1646 else if (type == SSH_SMSG_FAILURE)
Damien Miller996acd22003-04-09 20:59:48 +10001647 logit("Warning: Remote host refused compression.");
Damien Miller95def091999-11-25 00:26:21 +11001648 else
Darren Tuckerd6173c02008-06-13 04:52:53 +10001649 packet_disconnect("Protocol error waiting for "
1650 "compression response.");
Damien Miller95def091999-11-25 00:26:21 +11001651 }
1652 /* Allocate a pseudo tty if appropriate. */
1653 if (tty_flag) {
1654 debug("Requesting pty.");
1655
1656 /* Start the packet. */
1657 packet_start(SSH_CMSG_REQUEST_PTY);
1658
1659 /* Store TERM in the packet. There is no limit on the
1660 length of the string. */
1661 cp = getenv("TERM");
1662 if (!cp)
1663 cp = "";
Ben Lindstrom664408d2001-06-09 01:42:01 +00001664 packet_put_cstring(cp);
Damien Miller95def091999-11-25 00:26:21 +11001665
1666 /* Store window size in the packet. */
1667 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
1668 memset(&ws, 0, sizeof(ws));
Damien Miller71a73672006-03-26 14:04:36 +11001669 packet_put_int((u_int)ws.ws_row);
1670 packet_put_int((u_int)ws.ws_col);
1671 packet_put_int((u_int)ws.ws_xpixel);
1672 packet_put_int((u_int)ws.ws_ypixel);
Damien Miller95def091999-11-25 00:26:21 +11001673
1674 /* Store tty modes in the packet. */
Ben Lindstromae8e2d32001-04-14 23:13:02 +00001675 tty_make_modes(fileno(stdin), NULL);
Damien Miller95def091999-11-25 00:26:21 +11001676
1677 /* Send the packet, and wait for it to leave. */
1678 packet_send();
1679 packet_write_wait();
1680
1681 /* Read response from the server. */
Damien Millerdff50992002-01-22 23:16:32 +11001682 type = packet_read();
Damien Miller450a7a12000-03-26 13:04:51 +10001683 if (type == SSH_SMSG_SUCCESS) {
Damien Miller95def091999-11-25 00:26:21 +11001684 interactive = 1;
Damien Miller1383bd82000-04-06 12:32:37 +10001685 have_tty = 1;
Damien Miller450a7a12000-03-26 13:04:51 +10001686 } else if (type == SSH_SMSG_FAILURE)
Darren Tuckerd6173c02008-06-13 04:52:53 +10001687 logit("Warning: Remote host failed or refused to "
1688 "allocate a pseudo tty.");
Damien Miller95def091999-11-25 00:26:21 +11001689 else
Darren Tuckerd6173c02008-06-13 04:52:53 +10001690 packet_disconnect("Protocol error waiting for pty "
1691 "request response.");
Damien Miller95def091999-11-25 00:26:21 +11001692 }
1693 /* Request X11 forwarding if enabled and DISPLAY is set. */
Damien Miller17e7ed02005-06-17 12:54:33 +10001694 display = getenv("DISPLAY");
djm@openbsd.orga58be332015-04-17 13:16:48 +00001695 if (display == NULL && options.forward_x11)
1696 debug("X11 forwarding requested but DISPLAY not set");
Damien Miller17e7ed02005-06-17 12:54:33 +10001697 if (options.forward_x11 && display != NULL) {
Ben Lindstrom4a4bd712001-12-06 17:45:19 +00001698 char *proto, *data;
Damien Millerbd483e72000-04-30 10:00:53 +10001699 /* Get reasonable local authentication information. */
Damien Miller17e7ed02005-06-17 12:54:33 +10001700 client_x11_get_proto(display, options.xauth_location,
Damien Miller386feab2013-10-15 12:14:49 +11001701 options.forward_x11_trusted,
Damien Miller1ab6a512010-06-26 10:02:24 +10001702 options.forward_x11_timeout,
1703 &proto, &data);
Damien Millerbd483e72000-04-30 10:00:53 +10001704 /* Request forwarding with authentication spoofing. */
Darren Tuckerd6173c02008-06-13 04:52:53 +10001705 debug("Requesting X11 forwarding with authentication "
1706 "spoofing.");
Damien Miller6d7b4372011-06-23 08:31:57 +10001707 x11_request_forwarding_with_spoofing(0, display, proto,
1708 data, 0);
Damien Miller95def091999-11-25 00:26:21 +11001709 /* Read response from the server. */
Damien Millerdff50992002-01-22 23:16:32 +11001710 type = packet_read();
Damien Miller95def091999-11-25 00:26:21 +11001711 if (type == SSH_SMSG_SUCCESS) {
Damien Miller95def091999-11-25 00:26:21 +11001712 interactive = 1;
Damien Millerbd483e72000-04-30 10:00:53 +10001713 } else if (type == SSH_SMSG_FAILURE) {
Damien Miller996acd22003-04-09 20:59:48 +10001714 logit("Warning: Remote host denied X11 forwarding.");
Damien Millerbd483e72000-04-30 10:00:53 +10001715 } else {
Darren Tuckerd6173c02008-06-13 04:52:53 +10001716 packet_disconnect("Protocol error waiting for X11 "
1717 "forwarding");
Damien Millerbd483e72000-04-30 10:00:53 +10001718 }
Damien Miller95def091999-11-25 00:26:21 +11001719 }
1720 /* Tell the packet module whether this is an interactive session. */
Damien Miller0dac6fb2010-11-20 15:19:38 +11001721 packet_set_interactive(interactive,
1722 options.ip_qos_interactive, options.ip_qos_bulk);
Damien Miller95def091999-11-25 00:26:21 +11001723
1724 /* Request authentication agent forwarding if appropriate. */
Damien Miller0bc1bd82000-11-13 22:57:25 +11001725 check_agent_present();
1726
Damien Miller95def091999-11-25 00:26:21 +11001727 if (options.forward_agent) {
1728 debug("Requesting authentication agent forwarding.");
1729 auth_request_forwarding();
1730
1731 /* Read response from the server. */
Damien Millerdff50992002-01-22 23:16:32 +11001732 type = packet_read();
Damien Miller48b03fc2002-01-22 23:11:40 +11001733 packet_check_eom();
Damien Miller95def091999-11-25 00:26:21 +11001734 if (type != SSH_SMSG_SUCCESS)
Damien Miller996acd22003-04-09 20:59:48 +10001735 logit("Warning: Remote host denied authentication agent forwarding.");
Damien Miller95def091999-11-25 00:26:21 +11001736 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001737
Damien Miller0bc1bd82000-11-13 22:57:25 +11001738 /* Initiate port forwardings. */
Darren Tucker2d6665d2011-11-04 10:54:22 +11001739 ssh_init_stdio_forwarding();
Damien Miller0bc1bd82000-11-13 22:57:25 +11001740 ssh_init_forwarding();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001741
Darren Tuckerb776c852007-12-02 23:06:35 +11001742 /* Execute a local command */
1743 if (options.local_command != NULL &&
1744 options.permit_local_command)
1745 ssh_local_cmd(options.local_command);
1746
Darren Tucker9a2a6092008-07-04 12:53:50 +10001747 /*
1748 * If requested and we are not interested in replies to remote
1749 * forwarding requests, then let ssh continue in the background.
1750 */
Damien Millere11e1ea2010-08-03 16:04:46 +10001751 if (fork_after_authentication_flag) {
1752 if (options.exit_on_forward_failure &&
1753 options.num_remote_forwards > 0) {
1754 debug("deferring postauth fork until remote forward "
1755 "confirmation received");
1756 } else
1757 fork_postauth();
Darren Tucker9a2a6092008-07-04 12:53:50 +10001758 }
Damien Miller5428f641999-11-25 11:54:57 +11001759
1760 /*
1761 * If a command was specified on the command line, execute the
1762 * command now. Otherwise request the server to start a shell.
1763 */
Damien Miller95def091999-11-25 00:26:21 +11001764 if (buffer_len(&command) > 0) {
1765 int len = buffer_len(&command);
1766 if (len > 900)
1767 len = 900;
Darren Tuckerd6173c02008-06-13 04:52:53 +10001768 debug("Sending command: %.*s", len,
1769 (u_char *)buffer_ptr(&command));
Damien Miller95def091999-11-25 00:26:21 +11001770 packet_start(SSH_CMSG_EXEC_CMD);
1771 packet_put_string(buffer_ptr(&command), buffer_len(&command));
1772 packet_send();
1773 packet_write_wait();
1774 } else {
1775 debug("Requesting shell.");
1776 packet_start(SSH_CMSG_EXEC_SHELL);
1777 packet_send();
1778 packet_write_wait();
1779 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001780
Damien Miller95def091999-11-25 00:26:21 +11001781 /* Enter the interactive session. */
Ben Lindstrom2b1f71b2001-06-05 20:32:21 +00001782 return client_loop(have_tty, tty_flag ?
1783 options.escape_char : SSH_ESCAPECHAR_NONE, 0);
Damien Miller1383bd82000-04-06 12:32:37 +10001784}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001785
Ben Lindstromf558cf62001-09-20 23:13:49 +00001786/* request pty/x11/agent/tcpfwd/shell for channel */
Ben Lindstrombba81212001-06-25 05:01:22 +00001787static void
Damien Millerd530f5f2010-05-21 14:57:10 +10001788ssh_session2_setup(int id, int success, void *arg)
Damien Miller1383bd82000-04-06 12:32:37 +10001789{
Damien Miller3756dce2004-06-18 01:17:29 +10001790 extern char **environ;
Damien Miller17e7ed02005-06-17 12:54:33 +10001791 const char *display;
Damien Miller0e220db2004-06-15 10:34:08 +10001792 int interactive = tty_flag;
Damien Miller17e7ed02005-06-17 12:54:33 +10001793
Damien Millerd530f5f2010-05-21 14:57:10 +10001794 if (!success)
1795 return; /* No need for error message, channels code sens one */
1796
Damien Miller46d38de2005-07-17 17:02:09 +10001797 display = getenv("DISPLAY");
djm@openbsd.orga58be332015-04-17 13:16:48 +00001798 if (display == NULL && options.forward_x11)
1799 debug("X11 forwarding requested but DISPLAY not set");
Damien Miller17e7ed02005-06-17 12:54:33 +10001800 if (options.forward_x11 && display != NULL) {
Ben Lindstrom4a4bd712001-12-06 17:45:19 +00001801 char *proto, *data;
Damien Millerbd483e72000-04-30 10:00:53 +10001802 /* Get reasonable local authentication information. */
Damien Miller17e7ed02005-06-17 12:54:33 +10001803 client_x11_get_proto(display, options.xauth_location,
Damien Miller1ab6a512010-06-26 10:02:24 +10001804 options.forward_x11_trusted,
1805 options.forward_x11_timeout, &proto, &data);
Damien Millerbd483e72000-04-30 10:00:53 +10001806 /* Request forwarding with authentication spoofing. */
Darren Tuckerd6173c02008-06-13 04:52:53 +10001807 debug("Requesting X11 forwarding with authentication "
1808 "spoofing.");
Damien Miller6d7b4372011-06-23 08:31:57 +10001809 x11_request_forwarding_with_spoofing(id, display, proto,
1810 data, 1);
1811 client_expect_confirm(id, "X11 forwarding", CONFIRM_WARN);
1812 /* XXX exit_on_forward_failure */
Ben Lindstrombf555ba2001-01-18 02:04:35 +00001813 interactive = 1;
Damien Millerbd483e72000-04-30 10:00:53 +10001814 }
1815
Damien Miller0bc1bd82000-11-13 22:57:25 +11001816 check_agent_present();
1817 if (options.forward_agent) {
1818 debug("Requesting authentication agent forwarding.");
1819 channel_request_start(id, "auth-agent-req@openssh.com", 0);
1820 packet_send();
1821 }
1822
Darren Tucker7b305012012-07-02 18:55:09 +10001823 /* Tell the packet module whether this is an interactive session. */
1824 packet_set_interactive(interactive,
1825 options.ip_qos_interactive, options.ip_qos_bulk);
1826
Damien Miller0e220db2004-06-15 10:34:08 +10001827 client_session2_setup(id, tty_flag, subsystem_flag, getenv("TERM"),
Damien Miller5771ed72008-05-19 15:35:33 +10001828 NULL, fileno(stdin), &command, environ);
Damien Miller1383bd82000-04-06 12:32:37 +10001829}
1830
Ben Lindstromf558cf62001-09-20 23:13:49 +00001831/* open new channel for a session */
Ben Lindstrombba81212001-06-25 05:01:22 +00001832static int
Ben Lindstromf558cf62001-09-20 23:13:49 +00001833ssh_session2_open(void)
Damien Miller1383bd82000-04-06 12:32:37 +10001834{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001835 Channel *c;
1836 int window, packetmax, in, out, err;
Damien Millerad833b32000-08-23 10:46:23 +10001837
Damien Millercaf6dd62000-08-29 11:33:50 +11001838 if (stdin_null_flag) {
Ben Lindstrom31ca54a2001-02-09 02:11:24 +00001839 in = open(_PATH_DEVNULL, O_RDONLY);
Damien Millercaf6dd62000-08-29 11:33:50 +11001840 } else {
1841 in = dup(STDIN_FILENO);
1842 }
1843 out = dup(STDOUT_FILENO);
1844 err = dup(STDERR_FILENO);
1845
1846 if (in < 0 || out < 0 || err < 0)
1847 fatal("dup() in/out/err failed");
1848
Damien Miller69b69aa2000-10-28 14:19:58 +11001849 /* enable nonblocking unless tty */
1850 if (!isatty(in))
1851 set_nonblock(in);
1852 if (!isatty(out))
1853 set_nonblock(out);
1854 if (!isatty(err))
1855 set_nonblock(err);
1856
Damien Millere4340be2000-09-16 13:29:08 +11001857 window = CHAN_SES_WINDOW_DEFAULT;
1858 packetmax = CHAN_SES_PACKET_DEFAULT;
Damien Miller19a59452002-02-19 15:20:57 +11001859 if (tty_flag) {
1860 window >>= 1;
1861 packetmax >>= 1;
Damien Miller1383bd82000-04-06 12:32:37 +10001862 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001863 c = channel_new(
Damien Miller1383bd82000-04-06 12:32:37 +10001864 "session", SSH_CHANNEL_OPENING, in, out, err,
Damien Millere4340be2000-09-16 13:29:08 +11001865 window, packetmax, CHAN_EXTENDED_WRITE,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10001866 "client-session", /*nonblock*/0);
Damien Miller1383bd82000-04-06 12:32:37 +10001867
Ben Lindstromf558cf62001-09-20 23:13:49 +00001868 debug3("ssh_session2_open: channel_new: %d", c->self);
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001869
Ben Lindstrom5ec26452001-06-09 00:18:51 +00001870 channel_send_open(c->self);
Ben Lindstromf558cf62001-09-20 23:13:49 +00001871 if (!no_shell_flag)
Damien Millerb84886b2008-05-19 15:05:07 +10001872 channel_register_open_confirm(c->self,
1873 ssh_session2_setup, NULL);
Damien Miller1383bd82000-04-06 12:32:37 +10001874
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001875 return c->self;
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001876}
1877
Ben Lindstrombba81212001-06-25 05:01:22 +00001878static int
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001879ssh_session2(void)
1880{
Ben Lindstromf558cf62001-09-20 23:13:49 +00001881 int id = -1;
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001882
1883 /* XXX should be pre-session */
Darren Tucker2d6665d2011-11-04 10:54:22 +11001884 if (!options.control_persist)
1885 ssh_init_stdio_forwarding();
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001886 ssh_init_forwarding();
1887
Damien Millere11e1ea2010-08-03 16:04:46 +10001888 /* Start listening for multiplex clients */
1889 muxserver_listen();
1890
1891 /*
Darren Tucker2d6665d2011-11-04 10:54:22 +11001892 * If we are in control persist mode and have a working mux listen
1893 * socket, then prepare to background ourselves and have a foreground
1894 * client attach as a control slave.
1895 * NB. we must save copies of the flags that we override for
Damien Millere11e1ea2010-08-03 16:04:46 +10001896 * the backgrounding, since we defer attachment of the slave until
1897 * after the connection is fully established (in particular,
1898 * async rfwd replies have been received for ExitOnForwardFailure).
1899 */
1900 if (options.control_persist && muxserver_sock != -1) {
1901 ostdin_null_flag = stdin_null_flag;
1902 ono_shell_flag = no_shell_flag;
Damien Miller21771e22011-05-15 08:45:50 +10001903 orequest_tty = options.request_tty;
Damien Millere11e1ea2010-08-03 16:04:46 +10001904 otty_flag = tty_flag;
1905 stdin_null_flag = 1;
1906 no_shell_flag = 1;
Damien Millere11e1ea2010-08-03 16:04:46 +10001907 tty_flag = 0;
1908 if (!fork_after_authentication_flag)
1909 need_controlpersist_detach = 1;
1910 fork_after_authentication_flag = 1;
1911 }
Darren Tucker2d6665d2011-11-04 10:54:22 +11001912 /*
1913 * ControlPersist mux listen socket setup failed, attempt the
1914 * stdio forward setup that we skipped earlier.
1915 */
1916 if (options.control_persist && muxserver_sock == -1)
1917 ssh_init_stdio_forwarding();
Damien Millere11e1ea2010-08-03 16:04:46 +10001918
Ben Lindstromf558cf62001-09-20 23:13:49 +00001919 if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN))
1920 id = ssh_session2_open();
Damien Miller649fe022013-07-18 16:13:55 +10001921 else {
1922 packet_set_interactive(
1923 options.control_master == SSHCTL_MASTER_NO,
1924 options.ip_qos_interactive, options.ip_qos_bulk);
1925 }
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001926
Darren Tucker8901fa92008-06-11 09:34:01 +10001927 /* If we don't expect to open a new session, then disallow it */
Damien Miller456e6f02008-11-03 19:20:10 +11001928 if (options.control_master == SSHCTL_MASTER_NO &&
1929 (datafellows & SSH_NEW_OPENSSH)) {
Darren Tucker8901fa92008-06-11 09:34:01 +10001930 debug("Requesting no-more-sessions@openssh.com");
1931 packet_start(SSH2_MSG_GLOBAL_REQUEST);
1932 packet_put_cstring("no-more-sessions@openssh.com");
1933 packet_put_char(0);
1934 packet_send();
1935 }
1936
Damien Millerd27b9472005-12-13 19:29:02 +11001937 /* Execute a local command */
1938 if (options.local_command != NULL &&
1939 options.permit_local_command)
1940 ssh_local_cmd(options.local_command);
1941
Damien Miller1f25ab42010-07-16 13:56:23 +10001942 /*
1943 * If requested and we are not interested in replies to remote
1944 * forwarding requests, then let ssh continue in the background.
1945 */
Damien Millere11e1ea2010-08-03 16:04:46 +10001946 if (fork_after_authentication_flag) {
1947 if (options.exit_on_forward_failure &&
1948 options.num_remote_forwards > 0) {
1949 debug("deferring postauth fork until remote forward "
1950 "confirmation received");
1951 } else
1952 fork_postauth();
Darren Tucker9a2a6092008-07-04 12:53:50 +10001953 }
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001954
Darren Tuckerf1de4e52010-01-08 16:54:59 +11001955 if (options.use_roaming)
1956 request_roaming();
1957
Ben Lindstrom2b1f71b2001-06-05 20:32:21 +00001958 return client_loop(tty_flag, tty_flag ?
1959 options.escape_char : SSH_ESCAPECHAR_NONE, id);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001960}
Damien Miller0bc1bd82000-11-13 22:57:25 +11001961
djm@openbsd.org4e44a792015-09-24 06:15:11 +00001962/* Loads all IdentityFile and CertificateFile keys */
Ben Lindstrombba81212001-06-25 05:01:22 +00001963static void
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001964load_public_identity_files(void)
1965{
Damien Miller6b1d53c2006-03-31 23:13:21 +11001966 char *filename, *cp, thishost[NI_MAXHOST];
Darren Tuckerb4fbbc62007-12-02 23:16:32 +11001967 char *pwdir = NULL, *pwname = NULL;
Ben Lindstrom0936a5b2002-03-26 03:17:42 +00001968 Key *public;
Damien Miller6b1d53c2006-03-31 23:13:21 +11001969 struct passwd *pw;
djm@openbsd.org4e44a792015-09-24 06:15:11 +00001970 int i;
1971 u_int n_ids, n_certs;
Damien Miller0a80ca12010-02-27 07:55:05 +11001972 char *identity_files[SSH_MAX_IDENTITY_FILES];
1973 Key *identity_keys[SSH_MAX_IDENTITY_FILES];
djm@openbsd.org4e44a792015-09-24 06:15:11 +00001974 char *certificate_files[SSH_MAX_CERTIFICATE_FILES];
1975 struct sshkey *certificates[SSH_MAX_CERTIFICATE_FILES];
Damien Miller7ea845e2010-02-12 09:21:02 +11001976#ifdef ENABLE_PKCS11
Ben Lindstrom0936a5b2002-03-26 03:17:42 +00001977 Key **keys;
Damien Miller7ea845e2010-02-12 09:21:02 +11001978 int nkeys;
Damien Miller0a80ca12010-02-27 07:55:05 +11001979#endif /* PKCS11 */
Ben Lindstrom0936a5b2002-03-26 03:17:42 +00001980
djm@openbsd.org4e44a792015-09-24 06:15:11 +00001981 n_ids = n_certs = 0;
Damien Miller1d2c4562014-02-04 11:18:20 +11001982 memset(identity_files, 0, sizeof(identity_files));
1983 memset(identity_keys, 0, sizeof(identity_keys));
djm@openbsd.org4e44a792015-09-24 06:15:11 +00001984 memset(certificate_files, 0, sizeof(certificate_files));
1985 memset(certificates, 0, sizeof(certificates));
Damien Miller0a80ca12010-02-27 07:55:05 +11001986
1987#ifdef ENABLE_PKCS11
Damien Miller7ea845e2010-02-12 09:21:02 +11001988 if (options.pkcs11_provider != NULL &&
Ben Lindstrom0936a5b2002-03-26 03:17:42 +00001989 options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
Damien Miller7ea845e2010-02-12 09:21:02 +11001990 (pkcs11_init(!options.batch_mode) == 0) &&
1991 (nkeys = pkcs11_add_provider(options.pkcs11_provider, NULL,
1992 &keys)) > 0) {
Damien Miller7ea845e2010-02-12 09:21:02 +11001993 for (i = 0; i < nkeys; i++) {
Damien Miller0a80ca12010-02-27 07:55:05 +11001994 if (n_ids >= SSH_MAX_IDENTITY_FILES) {
1995 key_free(keys[i]);
1996 continue;
1997 }
1998 identity_keys[n_ids] = keys[i];
1999 identity_files[n_ids] =
Damien Miller7ea845e2010-02-12 09:21:02 +11002000 xstrdup(options.pkcs11_provider); /* XXX */
Damien Miller0a80ca12010-02-27 07:55:05 +11002001 n_ids++;
Ben Lindstrom0936a5b2002-03-26 03:17:42 +00002002 }
Darren Tuckera627d422013-06-02 07:31:17 +10002003 free(keys);
Ben Lindstrom711b04a2001-08-06 21:12:42 +00002004 }
Damien Miller7ea845e2010-02-12 09:21:02 +11002005#endif /* ENABLE_PKCS11 */
Damien Miller6b1d53c2006-03-31 23:13:21 +11002006 if ((pw = getpwuid(original_real_uid)) == NULL)
2007 fatal("load_public_identity_files: getpwuid failed");
Darren Tuckere143f062007-12-02 23:21:16 +11002008 pwname = xstrdup(pw->pw_name);
2009 pwdir = xstrdup(pw->pw_dir);
Damien Miller6b1d53c2006-03-31 23:13:21 +11002010 if (gethostname(thishost, sizeof(thishost)) == -1)
2011 fatal("load_public_identity_files: gethostname: %s",
2012 strerror(errno));
Damien Miller0a80ca12010-02-27 07:55:05 +11002013 for (i = 0; i < options.num_identity_files; i++) {
Darren Tucker15fd19c2013-04-05 11:22:26 +11002014 if (n_ids >= SSH_MAX_IDENTITY_FILES ||
2015 strcasecmp(options.identity_files[i], "none") == 0) {
Darren Tuckera627d422013-06-02 07:31:17 +10002016 free(options.identity_files[i]);
djm@openbsd.org4e44a792015-09-24 06:15:11 +00002017 options.identity_files[i] = NULL;
Damien Miller0a80ca12010-02-27 07:55:05 +11002018 continue;
2019 }
Damien Miller6b1d53c2006-03-31 23:13:21 +11002020 cp = tilde_expand_filename(options.identity_files[i],
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00002021 original_real_uid);
Darren Tuckerb4fbbc62007-12-02 23:16:32 +11002022 filename = percent_expand(cp, "d", pwdir,
2023 "u", pwname, "l", thishost, "h", host,
Damien Miller6b1d53c2006-03-31 23:13:21 +11002024 "r", options.user, (char *)NULL);
Darren Tuckera627d422013-06-02 07:31:17 +10002025 free(cp);
Ben Lindstromd0fca422001-03-26 13:44:06 +00002026 public = key_load_public(filename, NULL);
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00002027 debug("identity file %s type %d", filename,
2028 public ? public->type : -1);
Darren Tuckera627d422013-06-02 07:31:17 +10002029 free(options.identity_files[i]);
Damien Miller0a80ca12010-02-27 07:55:05 +11002030 identity_files[n_ids] = filename;
2031 identity_keys[n_ids] = public;
2032
2033 if (++n_ids >= SSH_MAX_IDENTITY_FILES)
2034 continue;
2035
djm@openbsd.org4e44a792015-09-24 06:15:11 +00002036 /*
2037 * If no certificates have been explicitly listed then try
2038 * to add the default certificate variant too.
2039 */
2040 if (options.num_certificate_files != 0)
2041 continue;
Damien Miller0a80ca12010-02-27 07:55:05 +11002042 xasprintf(&cp, "%s-cert", filename);
2043 public = key_load_public(cp, NULL);
2044 debug("identity file %s type %d", cp,
2045 public ? public->type : -1);
2046 if (public == NULL) {
Darren Tuckera627d422013-06-02 07:31:17 +10002047 free(cp);
Damien Miller0a80ca12010-02-27 07:55:05 +11002048 continue;
2049 }
2050 if (!key_is_cert(public)) {
2051 debug("%s: key %s type %s is not a certificate",
2052 __func__, cp, key_type(public));
2053 key_free(public);
Darren Tuckera627d422013-06-02 07:31:17 +10002054 free(cp);
Damien Miller0a80ca12010-02-27 07:55:05 +11002055 continue;
2056 }
2057 identity_keys[n_ids] = public;
djm@openbsd.org4e44a792015-09-24 06:15:11 +00002058 identity_files[n_ids] = cp;
Damien Miller0a80ca12010-02-27 07:55:05 +11002059 n_ids++;
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00002060 }
djm@openbsd.org4e44a792015-09-24 06:15:11 +00002061
2062 if (options.num_certificate_files > SSH_MAX_CERTIFICATE_FILES)
2063 fatal("%s: too many certificates", __func__);
2064 for (i = 0; i < options.num_certificate_files; i++) {
2065 cp = tilde_expand_filename(options.certificate_files[i],
2066 original_real_uid);
2067 filename = percent_expand(cp, "d", pwdir,
2068 "u", pwname, "l", thishost, "h", host,
2069 "r", options.user, (char *)NULL);
2070 free(cp);
2071
2072 public = key_load_public(filename, NULL);
2073 debug("certificate file %s type %d", filename,
2074 public ? public->type : -1);
2075 free(options.certificate_files[i]);
2076 options.certificate_files[i] = NULL;
2077 if (public == NULL) {
2078 free(filename);
2079 continue;
2080 }
2081 if (!key_is_cert(public)) {
2082 debug("%s: key %s type %s is not a certificate",
2083 __func__, filename, key_type(public));
2084 key_free(public);
2085 free(filename);
2086 continue;
2087 }
2088 certificate_files[n_certs] = filename;
2089 certificates[n_certs] = public;
2090 ++n_certs;
2091 }
2092
Damien Miller0a80ca12010-02-27 07:55:05 +11002093 options.num_identity_files = n_ids;
2094 memcpy(options.identity_files, identity_files, sizeof(identity_files));
2095 memcpy(options.identity_keys, identity_keys, sizeof(identity_keys));
2096
djm@openbsd.org4e44a792015-09-24 06:15:11 +00002097 options.num_certificate_files = n_certs;
2098 memcpy(options.certificate_files,
2099 certificate_files, sizeof(certificate_files));
2100 memcpy(options.certificates, certificates, sizeof(certificates));
2101
Damien Miller1d2c4562014-02-04 11:18:20 +11002102 explicit_bzero(pwname, strlen(pwname));
Darren Tuckera627d422013-06-02 07:31:17 +10002103 free(pwname);
Damien Miller1d2c4562014-02-04 11:18:20 +11002104 explicit_bzero(pwdir, strlen(pwdir));
Darren Tuckera627d422013-06-02 07:31:17 +10002105 free(pwdir);
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00002106}
Damien Miller857b02e2010-09-24 22:02:56 +10002107
2108static void
2109main_sigchld_handler(int sig)
2110{
2111 int save_errno = errno;
2112 pid_t pid;
2113 int status;
2114
2115 while ((pid = waitpid(-1, &status, WNOHANG)) > 0 ||
2116 (pid < 0 && errno == EINTR))
2117 ;
2118
2119 signal(sig, main_sigchld_handler);
2120 errno = save_errno;
2121}