blob: 8aa8daae474371feffc6496e0dca1f31ca1f34ff [file] [log] [blame]
djm@openbsd.orgb4867e02016-12-06 07:48:01 +00001/* $OpenBSD: ssh.c,v 1.448 2016/12/06 07:48:01 djm Exp $ */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002/*
Damien Miller95def091999-11-25 00:26:21 +11003 * Author: Tatu Ylonen <ylo@cs.hut.fi>
4 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5 * All rights reserved
Damien Miller95def091999-11-25 00:26:21 +11006 * Ssh client program. This program can be used to log into a remote machine.
7 * The software supports strong authentication, encryption, and forwarding
8 * of X11, TCP/IP, and authentication connections.
9 *
Damien Millere4340be2000-09-16 13:29:08 +110010 * As far as I am concerned, the code I have written for this software
11 * can be used freely for any purpose. Any derived versions of this
12 * software must be clearly marked as such, and if the derived work is
13 * incompatible with the protocol description in the RFC file, it must be
14 * called by a name other than "ssh" or "Secure Shell".
15 *
16 * Copyright (c) 1999 Niels Provos. All rights reserved.
Darren Tucker0a118da2003-10-15 15:54:32 +100017 * Copyright (c) 2000, 2001, 2002, 2003 Markus Friedl. All rights reserved.
Damien Millere4340be2000-09-16 13:29:08 +110018 *
19 * Modified to work with SSL by Niels Provos <provos@citi.umich.edu>
20 * in Canada (German citizen).
21 *
22 * Redistribution and use in source and binary forms, with or without
23 * modification, are permitted provided that the following conditions
24 * are met:
25 * 1. Redistributions of source code must retain the above copyright
26 * notice, this list of conditions and the following disclaimer.
27 * 2. Redistributions in binary form must reproduce the above copyright
28 * notice, this list of conditions and the following disclaimer in the
29 * documentation and/or other materials provided with the distribution.
30 *
31 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
32 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
33 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
34 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
35 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
36 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
37 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
38 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
39 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
40 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Damien Miller95def091999-11-25 00:26:21 +110041 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100042
43#include "includes.h"
Damien Millercd4223c2006-03-15 11:22:47 +110044
Damien Millerf17883e2006-03-15 11:45:54 +110045#include <sys/types.h>
46#ifdef HAVE_SYS_STAT_H
47# include <sys/stat.h>
48#endif
Damien Millercd4223c2006-03-15 11:22:47 +110049#include <sys/resource.h>
Damien Miller17e91c02006-03-15 11:28:34 +110050#include <sys/ioctl.h>
Damien Millere3b60b52006-07-10 21:08:03 +100051#include <sys/socket.h>
Damien 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>
djm@openbsd.org65c6c6b2016-07-17 04:20:16 +000070#include <locale.h>
Damien Millereba71ba2000-04-29 23:57:08 +100071
Darren Tucker46aa3e02006-09-02 15:32:40 +100072#include <netinet/in.h>
73#include <arpa/inet.h>
74
Damien Miller1f0311c2014-05-15 14:24:09 +100075#ifdef WITH_OPENSSL
Damien Millereba71ba2000-04-29 23:57:08 +100076#include <openssl/evp.h>
Damien Miller0bc1bd82000-11-13 22:57:25 +110077#include <openssl/err.h>
Damien Miller1f0311c2014-05-15 14:24:09 +100078#endif
Darren Tuckerbfaaf962008-02-28 19:13:52 +110079#include "openbsd-compat/openssl-compat.h"
Damien Millerb84886b2008-05-19 15:05:07 +100080#include "openbsd-compat/sys-queue.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100081
Damien Millerd7834352006-08-05 12:39:39 +100082#include "xmalloc.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100083#include "ssh.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000084#include "ssh1.h"
Damien Miller1383bd82000-04-06 12:32:37 +100085#include "ssh2.h"
Damien Millerb96c4412010-07-02 13:34:24 +100086#include "canohost.h"
Damien Miller1383bd82000-04-06 12:32:37 +100087#include "compat.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000088#include "cipher.h"
Damien Miller9c386432014-07-03 21:27:46 +100089#include "digest.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000090#include "packet.h"
91#include "buffer.h"
Ben Lindstromc7637672001-06-09 00:36:26 +000092#include "channels.h"
Damien Millereba71ba2000-04-29 23:57:08 +100093#include "key.h"
Damien Miller994cf142000-07-21 10:19:44 +100094#include "authfd.h"
Damien Millereba71ba2000-04-29 23:57:08 +100095#include "authfile.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000096#include "pathnames.h"
Damien Miller0e220db2004-06-15 10:34:08 +100097#include "dispatch.h"
Ben Lindstrombf555ba2001-01-18 02:04:35 +000098#include "clientloop.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000099#include "log.h"
Damien Miller7acefbb2014-07-18 14:11:24 +1000100#include "misc.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +0000101#include "readconf.h"
102#include "sshconnect.h"
Ben Lindstrom06b33aa2001-02-15 03:01:59 +0000103#include "kex.h"
104#include "mac.h"
Darren Tucker06f2bd82004-05-13 16:06:46 +1000105#include "sshpty.h"
Darren Tucker46bc0752004-05-02 22:11:30 +1000106#include "match.h"
Damien Miller0e220db2004-06-15 10:34:08 +1000107#include "msg.h"
Darren Tucker25f60a72004-08-15 17:23:34 +1000108#include "uidswap.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
Damien Miller5428f641999-11-25 11:54:57 +1100155/*
156 * General data structure for command line options and options configurable
157 * in configuration files. See readconf.h.
158 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000159Options options;
160
Ben Lindstrom14f31ab2001-09-12 17:48:04 +0000161/* optional user configfile */
162char *config = NULL;
163
Damien Miller5428f641999-11-25 11:54:57 +1100164/*
165 * Name of the host we are connecting to. This is the name given on the
166 * command line, or the HostName specified for the user-supplied name in a
167 * configuration file.
168 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000169char *host;
170
171/* socket address the host resolves to */
Damien Miller34132e52000-01-14 15:45:46 +1100172struct sockaddr_storage hostaddr;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000173
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000174/* Private host keys. */
Ben Lindstrom1bad2562002-06-06 19:57:33 +0000175Sensitive sensitive_data;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000176
177/* Original real UID. */
178uid_t original_real_uid;
Ben Lindstromf9c48842002-06-11 16:37:51 +0000179uid_t original_effective_uid;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000180
Damien Miller1383bd82000-04-06 12:32:37 +1000181/* command to be executed */
182Buffer command;
183
Damien Miller832562e2001-01-30 09:30:01 +1100184/* Should we execute a command or invoke a subsystem? */
185int subsystem_flag = 0;
186
Damien Miller2797f7f2002-04-23 21:09:44 +1000187/* # of replies received for global requests */
Darren Tucker9f407c42008-06-13 04:50:27 +1000188static int remote_forward_confirms_received = 0;
Damien Miller2797f7f2002-04-23 21:09:44 +1000189
Damien Millerb1cbfa22008-05-19 16:00:08 +1000190/* mux.c */
191extern int muxserver_sock;
192extern u_int muxclient_command;
Damien Miller0e220db2004-06-15 10:34:08 +1000193
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000194/* Prints a help message to the user. This function never returns. */
195
Ben Lindstrombba81212001-06-25 05:01:22 +0000196static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000197usage(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000198{
Damien Miller50955102004-03-22 09:34:58 +1100199 fprintf(stderr,
jmc@openbsd.orgb1ba15f2014-10-09 06:21:31 +0000200"usage: ssh [-1246AaCfGgKkMNnqsTtVvXxYy] [-b bind_address] [-c cipher_spec]\n"
Damien Miller03d4d7e2013-04-23 15:21:06 +1000201" [-D [bind_address:]port] [-E log_file] [-e escape_char]\n"
jmc@openbsd.orge4eb7d92016-07-16 06:57:55 +0000202" [-F configfile] [-I pkcs11] [-i identity_file]\n"
203" [-J [user@]host[:port]] [-L address] [-l login_name] [-m mac_spec]\n"
204" [-O ctl_cmd] [-o option] [-p port] [-Q query_option] [-R address]\n"
205" [-S ctl_path] [-W host:port] [-w local_tun[:remote_tun]]\n"
206" [user@]hostname [command]\n"
Damien Miller50955102004-03-22 09:34:58 +1100207 );
Darren Tuckere9a9b712005-12-20 16:15:51 +1100208 exit(255);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000209}
210
Ben Lindstrombba81212001-06-25 05:01:22 +0000211static int ssh_session(void);
212static int ssh_session2(void);
213static void load_public_identity_files(void);
Damien Miller857b02e2010-09-24 22:02:56 +1000214static void main_sigchld_handler(int);
Damien Millerb1cbfa22008-05-19 16:00:08 +1000215
Damien Miller295ee632011-05-29 21:42:31 +1000216/* ~/ expand a list of paths. NB. assumes path[n] is heap-allocated. */
217static void
218tilde_expand_paths(char **paths, u_int num_paths)
219{
220 u_int i;
221 char *cp;
222
223 for (i = 0; i < num_paths; i++) {
224 cp = tilde_expand_filename(paths[i], original_real_uid);
Darren Tuckera627d422013-06-02 07:31:17 +1000225 free(paths[i]);
Damien Miller295ee632011-05-29 21:42:31 +1000226 paths[i] = cp;
227 }
228}
229
Damien Miller13f97b22014-02-24 15:57:55 +1100230/*
231 * Attempt to resolve a host name / port to a set of addresses and
232 * optionally return any CNAMEs encountered along the way.
233 * Returns NULL on failure.
234 * NB. this function must operate with a options having undefined members.
235 */
Damien Miller0faf7472013-10-17 11:47:23 +1100236static struct addrinfo *
Damien Miller13f97b22014-02-24 15:57:55 +1100237resolve_host(const char *name, int port, int logerr, char *cname, size_t clen)
Damien Miller0faf7472013-10-17 11:47:23 +1100238{
239 char strport[NI_MAXSERV];
240 struct addrinfo hints, *res;
241 int gaierr, loglevel = SYSLOG_LEVEL_DEBUG1;
242
Damien Miller13f97b22014-02-24 15:57:55 +1100243 if (port <= 0)
244 port = default_ssh_port();
245
djm@openbsd.orgb1d38a32015-10-15 23:51:40 +0000246 snprintf(strport, sizeof strport, "%d", port);
Damien Miller1d2c4562014-02-04 11:18:20 +1100247 memset(&hints, 0, sizeof(hints));
Damien Miller13f97b22014-02-24 15:57:55 +1100248 hints.ai_family = options.address_family == -1 ?
249 AF_UNSPEC : options.address_family;
Damien Miller0faf7472013-10-17 11:47:23 +1100250 hints.ai_socktype = SOCK_STREAM;
251 if (cname != NULL)
252 hints.ai_flags = AI_CANONNAME;
253 if ((gaierr = getaddrinfo(name, strport, &hints, &res)) != 0) {
254 if (logerr || (gaierr != EAI_NONAME && gaierr != EAI_NODATA))
255 loglevel = SYSLOG_LEVEL_ERROR;
256 do_log2(loglevel, "%s: Could not resolve hostname %.100s: %s",
257 __progname, name, ssh_gai_strerror(gaierr));
258 return NULL;
259 }
260 if (cname != NULL && res->ai_canonname != NULL) {
261 if (strlcpy(cname, res->ai_canonname, clen) >= clen) {
262 error("%s: host \"%s\" cname \"%s\" too long (max %lu)",
263 __func__, name, res->ai_canonname, (u_long)clen);
264 if (clen > 0)
265 *cname = '\0';
266 }
267 }
268 return res;
269}
270
271/*
djm@openbsd.org90109022015-01-16 07:19:48 +0000272 * Attempt to resolve a numeric host address / port to a single address.
273 * Returns a canonical address string.
274 * Returns NULL on failure.
275 * NB. this function must operate with a options having undefined members.
276 */
277static struct addrinfo *
278resolve_addr(const char *name, int port, char *caddr, size_t clen)
279{
280 char addr[NI_MAXHOST], strport[NI_MAXSERV];
281 struct addrinfo hints, *res;
282 int gaierr;
283
284 if (port <= 0)
285 port = default_ssh_port();
286 snprintf(strport, sizeof strport, "%u", port);
287 memset(&hints, 0, sizeof(hints));
288 hints.ai_family = options.address_family == -1 ?
289 AF_UNSPEC : options.address_family;
290 hints.ai_socktype = SOCK_STREAM;
291 hints.ai_flags = AI_NUMERICHOST|AI_NUMERICSERV;
292 if ((gaierr = getaddrinfo(name, strport, &hints, &res)) != 0) {
293 debug2("%s: could not resolve name %.100s as address: %s",
294 __func__, name, ssh_gai_strerror(gaierr));
295 return NULL;
296 }
297 if (res == NULL) {
298 debug("%s: getaddrinfo %.100s returned no addresses",
299 __func__, name);
300 return NULL;
301 }
302 if (res->ai_next != NULL) {
303 debug("%s: getaddrinfo %.100s returned multiple addresses",
304 __func__, name);
305 goto fail;
306 }
307 if ((gaierr = getnameinfo(res->ai_addr, res->ai_addrlen,
308 addr, sizeof(addr), NULL, 0, NI_NUMERICHOST)) != 0) {
309 debug("%s: Could not format address for name %.100s: %s",
310 __func__, name, ssh_gai_strerror(gaierr));
311 goto fail;
312 }
313 if (strlcpy(caddr, addr, clen) >= clen) {
314 error("%s: host \"%s\" addr \"%s\" too long (max %lu)",
315 __func__, name, addr, (u_long)clen);
316 if (clen > 0)
317 *caddr = '\0';
318 fail:
319 freeaddrinfo(res);
320 return NULL;
321 }
322 return res;
323}
324
325/*
Damien Miller0faf7472013-10-17 11:47:23 +1100326 * Check whether the cname is a permitted replacement for the hostname
327 * and perform the replacement if it is.
Damien Miller13f97b22014-02-24 15:57:55 +1100328 * NB. this function must operate with a options having undefined members.
Damien Miller0faf7472013-10-17 11:47:23 +1100329 */
330static int
djm@openbsd.orged877ef2016-07-15 00:24:30 +0000331check_follow_cname(int direct, char **namep, const char *cname)
Damien Miller0faf7472013-10-17 11:47:23 +1100332{
333 int i;
334 struct allowed_cname *rule;
335
336 if (*cname == '\0' || options.num_permitted_cnames == 0 ||
337 strcmp(*namep, cname) == 0)
338 return 0;
Damien Miller38505592013-10-17 11:48:13 +1100339 if (options.canonicalize_hostname == SSH_CANONICALISE_NO)
Damien Miller0faf7472013-10-17 11:47:23 +1100340 return 0;
341 /*
Damien Miller38505592013-10-17 11:48:13 +1100342 * Don't attempt to canonicalize names that will be interpreted by
djm@openbsd.orged877ef2016-07-15 00:24:30 +0000343 * a proxy or jump host unless the user specifically requests so.
Damien Miller0faf7472013-10-17 11:47:23 +1100344 */
djm@openbsd.orged877ef2016-07-15 00:24:30 +0000345 if (!direct &&
Damien Miller38505592013-10-17 11:48:13 +1100346 options.canonicalize_hostname != SSH_CANONICALISE_ALWAYS)
Damien Miller0faf7472013-10-17 11:47:23 +1100347 return 0;
348 debug3("%s: check \"%s\" CNAME \"%s\"", __func__, *namep, cname);
349 for (i = 0; i < options.num_permitted_cnames; i++) {
350 rule = options.permitted_cnames + i;
djm@openbsd.orge661a862015-05-04 06:10:48 +0000351 if (match_pattern_list(*namep, rule->source_list, 1) != 1 ||
352 match_pattern_list(cname, rule->target_list, 1) != 1)
Damien Miller0faf7472013-10-17 11:47:23 +1100353 continue;
Damien Miller38505592013-10-17 11:48:13 +1100354 verbose("Canonicalized DNS aliased hostname "
Damien Miller0faf7472013-10-17 11:47:23 +1100355 "\"%s\" => \"%s\"", *namep, cname);
356 free(*namep);
357 *namep = xstrdup(cname);
358 return 1;
359 }
360 return 0;
361}
362
363/*
364 * Attempt to resolve the supplied hostname after applying the user's
Damien Miller51682fa2013-10-17 11:48:31 +1100365 * canonicalization rules. Returns the address list for the host or NULL
366 * if no name was found after canonicalization.
Damien Miller13f97b22014-02-24 15:57:55 +1100367 * NB. this function must operate with a options having undefined members.
Damien Miller0faf7472013-10-17 11:47:23 +1100368 */
369static struct addrinfo *
Damien Miller13f97b22014-02-24 15:57:55 +1100370resolve_canonicalize(char **hostp, int port)
Damien Miller0faf7472013-10-17 11:47:23 +1100371{
djm@openbsd.orged877ef2016-07-15 00:24:30 +0000372 int i, direct, ndots;
djm@openbsd.org90109022015-01-16 07:19:48 +0000373 char *cp, *fullhost, newname[NI_MAXHOST];
Damien Miller0faf7472013-10-17 11:47:23 +1100374 struct addrinfo *addrs;
375
Damien Miller38505592013-10-17 11:48:13 +1100376 if (options.canonicalize_hostname == SSH_CANONICALISE_NO)
Damien Miller0faf7472013-10-17 11:47:23 +1100377 return NULL;
Damien Miller13f97b22014-02-24 15:57:55 +1100378
Damien Miller0faf7472013-10-17 11:47:23 +1100379 /*
Damien Miller38505592013-10-17 11:48:13 +1100380 * Don't attempt to canonicalize names that will be interpreted by
Damien Miller0faf7472013-10-17 11:47:23 +1100381 * a proxy unless the user specifically requests so.
382 */
djm@openbsd.orged877ef2016-07-15 00:24:30 +0000383 direct = option_clear_or_none(options.proxy_command) &&
384 options.jump_host == NULL;
385 if (!direct &&
Damien Miller38505592013-10-17 11:48:13 +1100386 options.canonicalize_hostname != SSH_CANONICALISE_ALWAYS)
Damien Miller0faf7472013-10-17 11:47:23 +1100387 return NULL;
Damien Miller13f97b22014-02-24 15:57:55 +1100388
djm@openbsd.org90109022015-01-16 07:19:48 +0000389 /* Try numeric hostnames first */
390 if ((addrs = resolve_addr(*hostp, port,
391 newname, sizeof(newname))) != NULL) {
392 debug2("%s: hostname %.100s is address", __func__, *hostp);
393 if (strcasecmp(*hostp, newname) != 0) {
394 debug2("%s: canonicalised address \"%s\" => \"%s\"",
395 __func__, *hostp, newname);
396 free(*hostp);
397 *hostp = xstrdup(newname);
398 }
399 return addrs;
400 }
401
djm@openbsd.org5ee00632015-10-16 18:40:49 +0000402 /* If domain name is anchored, then resolve it now */
403 if ((*hostp)[strlen(*hostp) - 1] == '.') {
404 debug3("%s: name is fully qualified", __func__);
405 fullhost = xstrdup(*hostp);
406 if ((addrs = resolve_host(fullhost, port, 0,
407 newname, sizeof(newname))) != NULL)
408 goto found;
409 free(fullhost);
410 goto notfound;
411 }
412
Damien Miller51682fa2013-10-17 11:48:31 +1100413 /* Don't apply canonicalization to sufficiently-qualified hostnames */
Damien Miller0faf7472013-10-17 11:47:23 +1100414 ndots = 0;
415 for (cp = *hostp; *cp != '\0'; cp++) {
416 if (*cp == '.')
417 ndots++;
418 }
Damien Miller38505592013-10-17 11:48:13 +1100419 if (ndots > options.canonicalize_max_dots) {
420 debug3("%s: not canonicalizing hostname \"%s\" (max dots %d)",
421 __func__, *hostp, options.canonicalize_max_dots);
Damien Miller0faf7472013-10-17 11:47:23 +1100422 return NULL;
423 }
424 /* Attempt each supplied suffix */
425 for (i = 0; i < options.num_canonical_domains; i++) {
djm@openbsd.org90109022015-01-16 07:19:48 +0000426 *newname = '\0';
Damien Miller0faf7472013-10-17 11:47:23 +1100427 xasprintf(&fullhost, "%s.%s.", *hostp,
428 options.canonical_domains[i]);
Damien Miller13f97b22014-02-24 15:57:55 +1100429 debug3("%s: attempting \"%s\" => \"%s\"", __func__,
430 *hostp, fullhost);
431 if ((addrs = resolve_host(fullhost, port, 0,
djm@openbsd.org90109022015-01-16 07:19:48 +0000432 newname, sizeof(newname))) == NULL) {
Damien Miller0faf7472013-10-17 11:47:23 +1100433 free(fullhost);
434 continue;
435 }
djm@openbsd.org5ee00632015-10-16 18:40:49 +0000436 found:
Damien Miller0faf7472013-10-17 11:47:23 +1100437 /* Remove trailing '.' */
438 fullhost[strlen(fullhost) - 1] = '\0';
439 /* Follow CNAME if requested */
djm@openbsd.orged877ef2016-07-15 00:24:30 +0000440 if (!check_follow_cname(direct, &fullhost, newname)) {
Damien Miller38505592013-10-17 11:48:13 +1100441 debug("Canonicalized hostname \"%s\" => \"%s\"",
Damien Miller0faf7472013-10-17 11:47:23 +1100442 *hostp, fullhost);
443 }
444 free(*hostp);
445 *hostp = fullhost;
446 return addrs;
447 }
djm@openbsd.org5ee00632015-10-16 18:40:49 +0000448 notfound:
Damien Miller38505592013-10-17 11:48:13 +1100449 if (!options.canonicalize_fallback_local)
Damien Miller13f97b22014-02-24 15:57:55 +1100450 fatal("%s: Could not resolve host \"%s\"", __progname, *hostp);
451 debug2("%s: host %s not found in any suffix", __func__, *hostp);
Damien Miller0faf7472013-10-17 11:47:23 +1100452 return NULL;
453}
454
Damien Miller95def091999-11-25 00:26:21 +1100455/*
Damien Miller13f97b22014-02-24 15:57:55 +1100456 * Read per-user configuration file. Ignore the system wide config
457 * file if the user specifies a config file on the command line.
458 */
459static void
djm@openbsd.org957fbce2014-10-08 22:20:25 +0000460process_config_files(const char *host_arg, struct passwd *pw, int post_canon)
Damien Miller13f97b22014-02-24 15:57:55 +1100461{
deraadt@openbsd.org087266e2015-01-20 23:14:00 +0000462 char buf[PATH_MAX];
Damien Miller13f97b22014-02-24 15:57:55 +1100463 int r;
464
465 if (config != NULL) {
466 if (strcasecmp(config, "none") != 0 &&
djm@openbsd.org957fbce2014-10-08 22:20:25 +0000467 !read_config_file(config, pw, host, host_arg, &options,
468 SSHCONF_USERCONF | (post_canon ? SSHCONF_POSTCANON : 0)))
Damien Miller13f97b22014-02-24 15:57:55 +1100469 fatal("Can't open user config file %.100s: "
470 "%.100s", config, strerror(errno));
471 } else {
472 r = snprintf(buf, sizeof buf, "%s/%s", pw->pw_dir,
473 _PATH_SSH_USER_CONFFILE);
474 if (r > 0 && (size_t)r < sizeof(buf))
djm@openbsd.org957fbce2014-10-08 22:20:25 +0000475 (void)read_config_file(buf, pw, host, host_arg,
476 &options, SSHCONF_CHECKPERM | SSHCONF_USERCONF |
477 (post_canon ? SSHCONF_POSTCANON : 0));
Damien Miller13f97b22014-02-24 15:57:55 +1100478
479 /* Read systemwide configuration file after user config. */
djm@openbsd.org957fbce2014-10-08 22:20:25 +0000480 (void)read_config_file(_PATH_HOST_CONFIG_FILE, pw,
481 host, host_arg, &options,
482 post_canon ? SSHCONF_POSTCANON : 0);
483 }
484}
485
486/* Rewrite the port number in an addrinfo list of addresses */
487static void
488set_addrinfo_port(struct addrinfo *addrs, int port)
489{
490 struct addrinfo *addr;
491
492 for (addr = addrs; addr != NULL; addr = addr->ai_next) {
493 switch (addr->ai_family) {
494 case AF_INET:
495 ((struct sockaddr_in *)addr->ai_addr)->
496 sin_port = htons(port);
497 break;
498 case AF_INET6:
499 ((struct sockaddr_in6 *)addr->ai_addr)->
500 sin6_port = htons(port);
501 break;
502 }
Damien Miller13f97b22014-02-24 15:57:55 +1100503 }
504}
505
506/*
Damien Miller95def091999-11-25 00:26:21 +1100507 * Main program for the ssh client.
508 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000509int
510main(int ac, char **av)
511{
djm@openbsd.org95767262016-03-07 19:02:43 +0000512 struct ssh *ssh = NULL;
djm@openbsd.orged877ef2016-07-15 00:24:30 +0000513 int i, r, opt, exit_status, use_syslog, direct, config_test = 0;
deraadt@openbsd.org087266e2015-01-20 23:14:00 +0000514 char *p, *cp, *line, *argv0, buf[PATH_MAX], *host_arg, *logfile;
Damien Millerdfc85fa2011-05-15 08:44:02 +1000515 char thishost[NI_MAXHOST], shorthost[NI_MAXHOST], portstr[NI_MAXSERV];
djm@openbsd.org674b3b62015-09-11 03:47:28 +0000516 char cname[NI_MAXHOST], uidstr[32], *conn_hash_hex;
Damien Miller95def091999-11-25 00:26:21 +1100517 struct stat st;
Ben Lindstrom086cf212001-03-05 05:56:40 +0000518 struct passwd *pw;
Damien Miller194fd902013-10-15 12:13:05 +1100519 int timeout_ms;
Ben Lindstrom5ccf63a2001-09-24 20:00:10 +0000520 extern int optind, optreset;
Damien Miller4f8e6692001-07-14 13:22:53 +1000521 extern char *optarg;
Damien Miller7acefbb2014-07-18 14:11:24 +1000522 struct Forward fwd;
Damien Miller0faf7472013-10-17 11:47:23 +1100523 struct addrinfo *addrs = NULL;
Damien Miller9c386432014-07-03 21:27:46 +1000524 struct ssh_digest_ctx *md;
525 u_char conn_hash[SSH_DIGEST_MAX_LENGTH];
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000526
dtucker@openbsd.orgffb1e7e2016-02-15 09:47:49 +0000527 ssh_malloc_init(); /* must be called before any mallocs */
Darren Tuckerce321d82005-10-03 18:11:24 +1000528 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
529 sanitise_stdfd();
530
Damien Miller59d3d5b2003-08-22 09:34:41 +1000531 __progname = ssh_get_progname(av[0]);
Damien Millerf9b625c2000-07-09 22:42:32 +1000532
Damien Millerea2c1a42011-06-03 12:10:22 +1000533#ifndef HAVE_SETPROCTITLE
534 /* Prepare for later setproctitle emulation */
535 /* Save argv so it isn't clobbered by setproctitle() emulation */
536 saved_av = xcalloc(ac + 1, sizeof(*saved_av));
537 for (i = 0; i < ac; i++)
538 saved_av[i] = xstrdup(av[i]);
539 saved_av[i] = NULL;
540 compat_init_setproctitle(ac, av);
541 av = saved_av;
542#endif
543
Damien Miller5428f641999-11-25 11:54:57 +1100544 /*
Damien Miller00d9ae22010-08-17 01:59:31 +1000545 * Discard other fds that are hanging around. These can cause problem
546 * with backgrounded ssh processes started by ControlPersist.
547 */
548 closefrom(STDERR_FILENO + 1);
549
550 /*
Damien Miller5428f641999-11-25 11:54:57 +1100551 * Save the original real uid. It will be needed later (uid-swapping
552 * may clobber the real uid).
553 */
Damien Miller95def091999-11-25 00:26:21 +1100554 original_real_uid = getuid();
555 original_effective_uid = geteuid();
Damien Millera8e06ce2003-11-21 23:48:55 +1100556
Damien Miller50b9a602002-09-04 16:50:06 +1000557 /*
558 * Use uid-swapping to give up root privileges for the duration of
559 * option processing. We will re-instantiate the rights when we are
560 * ready to create the privileged port, and will permanently drop
561 * them when the port has been created (actually, when the connection
562 * has been made, as we may need to create the port several times).
563 */
564 PRIV_END;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000565
Damien Miller05dd7952000-10-01 00:42:48 +1100566#ifdef HAVE_SETRLIMIT
Damien Miller95def091999-11-25 00:26:21 +1100567 /* If we are installed setuid root be careful to not drop core. */
568 if (original_real_uid != original_effective_uid) {
569 struct rlimit rlim;
570 rlim.rlim_cur = rlim.rlim_max = 0;
571 if (setrlimit(RLIMIT_CORE, &rlim) < 0)
572 fatal("setrlimit failed: %.100s", strerror(errno));
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000573 }
Damien Millerbac2d8a2000-09-05 16:13:06 +1100574#endif
Ben Lindstrom3fcf1a22001-04-08 18:26:59 +0000575 /* Get user data. */
576 pw = getpwuid(original_real_uid);
577 if (!pw) {
Damien Miller3009d3c2013-07-20 13:22:31 +1000578 logit("No user exists for uid %lu", (u_long)original_real_uid);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100579 exit(255);
Ben Lindstrom3fcf1a22001-04-08 18:26:59 +0000580 }
581 /* Take a copy of the returned structure. */
582 pw = pwcopy(pw);
583
Damien Miller5428f641999-11-25 11:54:57 +1100584 /*
Damien Miller5428f641999-11-25 11:54:57 +1100585 * Set our umask to something reasonable, as some files are created
586 * with the default umask. This will make them world-readable but
587 * writable only by the owner, which is ok for all files for which we
588 * don't set the modes explicitly.
589 */
Damien Miller95def091999-11-25 00:26:21 +1100590 umask(022);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000591
djm@openbsd.org65c6c6b2016-07-17 04:20:16 +0000592 setlocale(LC_CTYPE, "");
593
Darren Tuckerd6173c02008-06-13 04:52:53 +1000594 /*
595 * Initialize option structure to indicate that no values have been
596 * set.
597 */
Damien Miller95def091999-11-25 00:26:21 +1100598 initialize_options(&options);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000599
Damien Miller95def091999-11-25 00:26:21 +1100600 /* Parse command-line arguments. */
601 host = NULL;
Damien Millere272a5b2008-11-03 19:22:37 +1100602 use_syslog = 0;
Damien Miller03d4d7e2013-04-23 15:21:06 +1000603 logfile = NULL;
Darren Tucker72efd742009-06-21 17:48:00 +1000604 argv0 = av[0];
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000605
Damien Miller2ecb6bd2006-03-15 12:03:53 +1100606 again:
Darren Tuckerd6173c02008-06-13 04:52:53 +1000607 while ((opt = getopt(ac, av, "1246ab:c:e:fgi:kl:m:no:p:qstvx"
djm@openbsd.orged877ef2016-07-15 00:24:30 +0000608 "ACD:E:F:GI:J:KL:MNO:PQ:R:S:TVw:W:XYy")) != -1) {
Damien Miller95def091999-11-25 00:26:21 +1100609 switch (opt) {
Ben Lindstrom1e7d3062001-02-09 02:36:43 +0000610 case '1':
611 options.protocol = SSH_PROTO_1;
612 break;
Damien Miller4af51302000-04-16 11:18:38 +1000613 case '2':
614 options.protocol = SSH_PROTO_2;
615 break;
Damien Miller34132e52000-01-14 15:45:46 +1100616 case '4':
Darren Tucker0a4f04b2003-07-03 20:37:47 +1000617 options.address_family = AF_INET;
Damien Miller34132e52000-01-14 15:45:46 +1100618 break;
Damien Miller34132e52000-01-14 15:45:46 +1100619 case '6':
Darren Tucker0a4f04b2003-07-03 20:37:47 +1000620 options.address_family = AF_INET6;
Damien Miller34132e52000-01-14 15:45:46 +1100621 break;
Damien Miller95def091999-11-25 00:26:21 +1100622 case 'n':
623 stdin_null_flag = 1;
624 break;
Damien Miller95def091999-11-25 00:26:21 +1100625 case 'f':
626 fork_after_authentication_flag = 1;
627 stdin_null_flag = 1;
628 break;
Damien Miller95def091999-11-25 00:26:21 +1100629 case 'x':
630 options.forward_x11 = 0;
631 break;
Damien Miller95def091999-11-25 00:26:21 +1100632 case 'X':
633 options.forward_x11 = 1;
634 break;
Damien Millere272a5b2008-11-03 19:22:37 +1100635 case 'y':
636 use_syslog = 1;
637 break;
Damien Miller03d4d7e2013-04-23 15:21:06 +1000638 case 'E':
dtucker@openbsd.org4f7cc2f2015-09-04 08:21:47 +0000639 logfile = optarg;
Damien Miller03d4d7e2013-04-23 15:21:06 +1000640 break;
djm@openbsd.org957fbce2014-10-08 22:20:25 +0000641 case 'G':
642 config_test = 1;
643 break;
Darren Tucker0a118da2003-10-15 15:54:32 +1000644 case 'Y':
645 options.forward_x11 = 1;
646 options.forward_x11_trusted = 1;
647 break;
Damien Miller95def091999-11-25 00:26:21 +1100648 case 'g':
Damien Miller7acefbb2014-07-18 14:11:24 +1000649 options.fwd_opts.gateway_ports = 1;
Damien Miller95def091999-11-25 00:26:21 +1100650 break;
Darren Tucker7ebfc102004-11-07 20:06:19 +1100651 case 'O':
dtucker@openbsd.org8543ff32016-06-03 03:14:41 +0000652 if (options.stdio_forward_host != NULL)
Damien Millere1537f92010-01-26 13:26:22 +1100653 fatal("Cannot specify multiplexing "
654 "command with -W");
655 else if (muxclient_command != 0)
656 fatal("Multiplexing command already specified");
Darren Tucker7ebfc102004-11-07 20:06:19 +1100657 if (strcmp(optarg, "check") == 0)
Damien Millerb1cbfa22008-05-19 16:00:08 +1000658 muxclient_command = SSHMUX_COMMAND_ALIVE_CHECK;
Damien Miller388f6fc2010-05-21 14:57:35 +1000659 else if (strcmp(optarg, "forward") == 0)
660 muxclient_command = SSHMUX_COMMAND_FORWARD;
Darren Tucker7ebfc102004-11-07 20:06:19 +1100661 else if (strcmp(optarg, "exit") == 0)
Damien Millerb1cbfa22008-05-19 16:00:08 +1000662 muxclient_command = SSHMUX_COMMAND_TERMINATE;
Damien Miller6c3eec72011-05-05 14:16:22 +1000663 else if (strcmp(optarg, "stop") == 0)
664 muxclient_command = SSHMUX_COMMAND_STOP;
Damien Millerf6dff7c2011-09-22 21:38:52 +1000665 else if (strcmp(optarg, "cancel") == 0)
666 muxclient_command = SSHMUX_COMMAND_CANCEL_FWD;
markus@openbsd.org8d057842016-09-30 09:19:13 +0000667 else if (strcmp(optarg, "proxy") == 0)
668 muxclient_command = SSHMUX_COMMAND_PROXY;
Darren Tucker7ebfc102004-11-07 20:06:19 +1100669 else
670 fatal("Invalid multiplex command.");
671 break;
Damien Miller147bba32002-09-04 16:46:06 +1000672 case 'P': /* deprecated */
Damien Miller95def091999-11-25 00:26:21 +1100673 options.use_privileged_port = 0;
674 break;
Damien Millerd937dc02013-12-05 10:19:54 +1100675 case 'Q':
Damien Millerea111192013-04-23 19:24:32 +1000676 cp = NULL;
Damien Millerd937dc02013-12-05 10:19:54 +1100677 if (strcmp(optarg, "cipher") == 0)
Damien Miller0fde8ac2013-11-21 14:12:23 +1100678 cp = cipher_alg_list('\n', 0);
Damien Millerd937dc02013-12-05 10:19:54 +1100679 else if (strcmp(optarg, "cipher-auth") == 0)
Damien Miller0fde8ac2013-11-21 14:12:23 +1100680 cp = cipher_alg_list('\n', 1);
Damien Millerd937dc02013-12-05 10:19:54 +1100681 else if (strcmp(optarg, "mac") == 0)
Damien Miller690d9892013-11-08 12:16:49 +1100682 cp = mac_alg_list('\n');
Damien Millerd937dc02013-12-05 10:19:54 +1100683 else if (strcmp(optarg, "kex") == 0)
Damien Miller690d9892013-11-08 12:16:49 +1100684 cp = kex_alg_list('\n');
Damien Millerd937dc02013-12-05 10:19:54 +1100685 else if (strcmp(optarg, "key") == 0)
djm@openbsd.org130f5df2016-09-12 23:31:27 +0000686 cp = sshkey_alg_list(0, 0, '\n');
Damien Miller5be9d9e2013-12-07 11:24:01 +1100687 else if (strcmp(optarg, "key-cert") == 0)
djm@openbsd.org130f5df2016-09-12 23:31:27 +0000688 cp = sshkey_alg_list(1, 0, '\n');
Damien Miller5be9d9e2013-12-07 11:24:01 +1100689 else if (strcmp(optarg, "key-plain") == 0)
djm@openbsd.org130f5df2016-09-12 23:31:27 +0000690 cp = sshkey_alg_list(0, 1, '\n');
djm@openbsd.org68d2dfc2015-03-03 06:48:58 +0000691 else if (strcmp(optarg, "protocol-version") == 0) {
692#ifdef WITH_SSH1
693 cp = xstrdup("1\n2");
694#else
695 cp = xstrdup("2");
696#endif
697 }
Damien Millerea111192013-04-23 19:24:32 +1000698 if (cp == NULL)
699 fatal("Unsupported query \"%s\"", optarg);
700 printf("%s\n", cp);
701 free(cp);
702 exit(0);
703 break;
Damien Miller95def091999-11-25 00:26:21 +1100704 case 'a':
705 options.forward_agent = 0;
706 break;
Damien Millerb1715dc2000-05-30 13:44:51 +1000707 case 'A':
708 options.forward_agent = 1;
709 break;
Damien Miller95def091999-11-25 00:26:21 +1100710 case 'k':
Damien Millere0113cc2003-11-24 13:10:09 +1100711 options.gss_deleg_creds = 0;
Damien Miller95def091999-11-25 00:26:21 +1100712 break;
Darren Tucker415bddc2007-06-12 23:43:16 +1000713 case 'K':
714 options.gss_authentication = 1;
715 options.gss_deleg_creds = 1;
716 break;
Damien Miller95def091999-11-25 00:26:21 +1100717 case 'i':
dtucker@openbsd.org03239c12015-10-25 23:42:00 +0000718 p = tilde_expand_filename(optarg, original_real_uid);
719 if (stat(p, &st) < 0)
Damien Millerf4614452001-07-14 12:18:10 +1000720 fprintf(stderr, "Warning: Identity file %s "
dtucker@openbsd.org03239c12015-10-25 23:42:00 +0000721 "not accessible: %s.\n", p,
Damien Miller3eb48b62005-03-01 21:15:46 +1100722 strerror(errno));
dtucker@openbsd.org03239c12015-10-25 23:42:00 +0000723 else
724 add_identity_file(&options, NULL, p, 1);
725 free(p);
Damien Miller95def091999-11-25 00:26:21 +1100726 break;
Ben Lindstromc5b68002001-07-04 04:52:03 +0000727 case 'I':
Damien Miller7ea845e2010-02-12 09:21:02 +1100728#ifdef ENABLE_PKCS11
dtucker@openbsd.org4f7cc2f2015-09-04 08:21:47 +0000729 free(options.pkcs11_provider);
Damien Miller7ea845e2010-02-12 09:21:02 +1100730 options.pkcs11_provider = xstrdup(optarg);
Ben Lindstrombcc18082001-08-06 21:59:25 +0000731#else
Damien Miller7ea845e2010-02-12 09:21:02 +1100732 fprintf(stderr, "no support for PKCS#11.\n");
Ben Lindstrombcc18082001-08-06 21:59:25 +0000733#endif
Ben Lindstromc5b68002001-07-04 04:52:03 +0000734 break;
djm@openbsd.orged877ef2016-07-15 00:24:30 +0000735 case 'J':
736 if (options.jump_host != NULL)
737 fatal("Only a single -J option permitted");
738 if (options.proxy_command != NULL)
739 fatal("Cannot specify -J with ProxyCommand");
740 if (parse_jump(optarg, &options, 1) == -1)
741 fatal("Invalid -J argument");
742 options.proxy_command = xstrdup("none");
743 break;
Damien Miller95def091999-11-25 00:26:21 +1100744 case 't':
Damien Miller21771e22011-05-15 08:45:50 +1000745 if (options.request_tty == REQUEST_TTY_YES)
746 options.request_tty = REQUEST_TTY_FORCE;
747 else
748 options.request_tty = REQUEST_TTY_YES;
Damien Miller95def091999-11-25 00:26:21 +1100749 break;
Damien Miller95def091999-11-25 00:26:21 +1100750 case 'v':
Darren Tuckere98dfa32003-07-19 19:54:31 +1000751 if (debug_flag == 0) {
Damien Millere4340be2000-09-16 13:29:08 +1100752 debug_flag = 1;
753 options.log_level = SYSLOG_LEVEL_DEBUG1;
Darren Tuckere98dfa32003-07-19 19:54:31 +1000754 } else {
djm@openbsd.orged877ef2016-07-15 00:24:30 +0000755 if (options.log_level < SYSLOG_LEVEL_DEBUG3) {
756 debug_flag++;
Darren Tuckere98dfa32003-07-19 19:54:31 +1000757 options.log_level++;
djm@openbsd.orged877ef2016-07-15 00:24:30 +0000758 }
Darren Tuckere98dfa32003-07-19 19:54:31 +1000759 }
Damien Miller03d4d7e2013-04-23 15:21:06 +1000760 break;
Damien Miller95def091999-11-25 00:26:21 +1100761 case 'V':
Damien Miller0c889cd2004-03-22 09:36:00 +1100762 fprintf(stderr, "%s, %s\n",
Damien Miller1f0311c2014-05-15 14:24:09 +1000763 SSH_RELEASE,
764#ifdef WITH_OPENSSL
765 SSLeay_version(SSLEAY_VERSION)
766#else
767 "without OpenSSL"
768#endif
769 );
Damien Miller95def091999-11-25 00:26:21 +1100770 if (opt == 'V')
771 exit(0);
Damien Miller95def091999-11-25 00:26:21 +1100772 break;
Damien Millerd27b9472005-12-13 19:29:02 +1100773 case 'w':
Damien Miller7b58e802005-12-13 19:33:19 +1100774 if (options.tun_open == -1)
775 options.tun_open = SSH_TUNMODE_DEFAULT;
Damien Millerd27b9472005-12-13 19:29:02 +1100776 options.tun_local = a2tun(optarg, &options.tun_remote);
Damien Miller7b58e802005-12-13 19:33:19 +1100777 if (options.tun_local == SSH_TUNID_ERR) {
Darren Tuckerd6173c02008-06-13 04:52:53 +1000778 fprintf(stderr,
779 "Bad tun device '%s'\n", optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100780 exit(255);
Damien Millerd27b9472005-12-13 19:29:02 +1100781 }
782 break;
Darren Tucker7ad8dd22010-01-12 19:40:27 +1100783 case 'W':
dtucker@openbsd.org8543ff32016-06-03 03:14:41 +0000784 if (options.stdio_forward_host != NULL)
Damien Millere1537f92010-01-26 13:26:22 +1100785 fatal("stdio forward already specified");
786 if (muxclient_command != 0)
787 fatal("Cannot specify stdio forward with -O");
Darren Tucker7ad8dd22010-01-12 19:40:27 +1100788 if (parse_forward(&fwd, optarg, 1, 0)) {
dtucker@openbsd.org8543ff32016-06-03 03:14:41 +0000789 options.stdio_forward_host = fwd.listen_host;
790 options.stdio_forward_port = fwd.listen_port;
Darren Tuckera627d422013-06-02 07:31:17 +1000791 free(fwd.connect_host);
Darren Tucker7ad8dd22010-01-12 19:40:27 +1100792 } else {
793 fprintf(stderr,
794 "Bad stdio forwarding specification '%s'\n",
795 optarg);
796 exit(255);
797 }
Damien Miller21771e22011-05-15 08:45:50 +1000798 options.request_tty = REQUEST_TTY_NO;
Darren Tucker7ad8dd22010-01-12 19:40:27 +1100799 no_shell_flag = 1;
Darren Tucker7ad8dd22010-01-12 19:40:27 +1100800 break;
Damien Miller95def091999-11-25 00:26:21 +1100801 case 'q':
802 options.log_level = SYSLOG_LEVEL_QUIET;
803 break;
Damien Miller95def091999-11-25 00:26:21 +1100804 case 'e':
805 if (optarg[0] == '^' && optarg[2] == 0 &&
Damien Millerf4614452001-07-14 12:18:10 +1000806 (u_char) optarg[1] >= 64 &&
807 (u_char) optarg[1] < 128)
Ben Lindstrom46c16222000-12-22 01:43:59 +0000808 options.escape_char = (u_char) optarg[1] & 31;
Damien Miller95def091999-11-25 00:26:21 +1100809 else if (strlen(optarg) == 1)
Ben Lindstrom46c16222000-12-22 01:43:59 +0000810 options.escape_char = (u_char) optarg[0];
Damien Miller95def091999-11-25 00:26:21 +1100811 else if (strcmp(optarg, "none") == 0)
Ben Lindstrom2b1f71b2001-06-05 20:32:21 +0000812 options.escape_char = SSH_ESCAPECHAR_NONE;
Damien Miller95def091999-11-25 00:26:21 +1100813 else {
Damien Millerf4614452001-07-14 12:18:10 +1000814 fprintf(stderr, "Bad escape character '%s'.\n",
815 optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100816 exit(255);
Damien Miller95def091999-11-25 00:26:21 +1100817 }
818 break;
Damien Miller95def091999-11-25 00:26:21 +1100819 case 'c':
djm@openbsd.orgf9eca242015-07-30 00:01:34 +0000820 if (ciphers_valid(*optarg == '+' ?
821 optarg + 1 : optarg)) {
Damien Millereba71ba2000-04-29 23:57:08 +1000822 /* SSH2 only */
dtucker@openbsd.org4f7cc2f2015-09-04 08:21:47 +0000823 free(options.ciphers);
Damien Millereba71ba2000-04-29 23:57:08 +1000824 options.ciphers = xstrdup(optarg);
Darren Tucker5cb30ad2004-08-12 22:40:24 +1000825 options.cipher = SSH_CIPHER_INVALID;
djm@openbsd.orgf9eca242015-07-30 00:01:34 +0000826 break;
Damien Miller95def091999-11-25 00:26:21 +1100827 }
djm@openbsd.orgf9eca242015-07-30 00:01:34 +0000828 /* SSH1 only */
829 options.cipher = cipher_number(optarg);
830 if (options.cipher == -1) {
831 fprintf(stderr, "Unknown cipher type '%s'\n",
832 optarg);
833 exit(255);
834 }
835 if (options.cipher == SSH_CIPHER_3DES)
836 options.ciphers = xstrdup("3des-cbc");
837 else if (options.cipher == SSH_CIPHER_BLOWFISH)
838 options.ciphers = xstrdup("blowfish-cbc");
839 else
840 options.ciphers = xstrdup(KEX_CLIENT_ENCRYPT);
Damien Miller95def091999-11-25 00:26:21 +1100841 break;
Ben Lindstrom06b33aa2001-02-15 03:01:59 +0000842 case 'm':
dtucker@openbsd.org4f7cc2f2015-09-04 08:21:47 +0000843 if (mac_valid(optarg)) {
844 free(options.macs);
Ben Lindstrom06b33aa2001-02-15 03:01:59 +0000845 options.macs = xstrdup(optarg);
dtucker@openbsd.org4f7cc2f2015-09-04 08:21:47 +0000846 } else {
Damien Millerf4614452001-07-14 12:18:10 +1000847 fprintf(stderr, "Unknown mac type '%s'\n",
848 optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100849 exit(255);
Ben Lindstrom06b33aa2001-02-15 03:01:59 +0000850 }
851 break;
Damien Miller0e220db2004-06-15 10:34:08 +1000852 case 'M':
Damien Millerd14b1e72005-06-16 13:19:41 +1000853 if (options.control_master == SSHCTL_MASTER_YES)
854 options.control_master = SSHCTL_MASTER_ASK;
855 else
856 options.control_master = SSHCTL_MASTER_YES;
Damien Miller0e220db2004-06-15 10:34:08 +1000857 break;
Damien Miller95def091999-11-25 00:26:21 +1100858 case 'p':
Ben Lindstrom19066a12001-04-12 23:39:26 +0000859 options.port = a2port(optarg);
Damien Miller3dc71ad2009-01-28 16:31:22 +1100860 if (options.port <= 0) {
Ben Lindstrom146edb92001-04-11 23:06:28 +0000861 fprintf(stderr, "Bad port '%s'\n", optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100862 exit(255);
Ben Lindstrom146edb92001-04-11 23:06:28 +0000863 }
Damien Miller95def091999-11-25 00:26:21 +1100864 break;
Damien Miller95def091999-11-25 00:26:21 +1100865 case 'l':
866 options.user = optarg;
867 break;
Ben Lindstrom1a174712001-09-12 17:56:15 +0000868
Damien Miller95def091999-11-25 00:26:21 +1100869 case 'L':
Damien Miller4bf648f2009-02-14 16:28:21 +1100870 if (parse_forward(&fwd, optarg, 0, 0))
Damien Millerf91ee4c2005-03-01 21:24:33 +1100871 add_local_forward(&options, &fwd);
872 else {
Damien Millerf4614452001-07-14 12:18:10 +1000873 fprintf(stderr,
Damien Millerf91ee4c2005-03-01 21:24:33 +1100874 "Bad local forwarding specification '%s'\n",
Damien Millerf4614452001-07-14 12:18:10 +1000875 optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100876 exit(255);
Ben Lindstrom1a174712001-09-12 17:56:15 +0000877 }
Damien Millerf91ee4c2005-03-01 21:24:33 +1100878 break;
879
880 case 'R':
Damien Miller4bf648f2009-02-14 16:28:21 +1100881 if (parse_forward(&fwd, optarg, 0, 1)) {
Damien Millerf91ee4c2005-03-01 21:24:33 +1100882 add_remote_forward(&options, &fwd);
883 } else {
884 fprintf(stderr,
885 "Bad remote forwarding specification "
886 "'%s'\n", optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100887 exit(255);
Damien Millerf91ee4c2005-03-01 21:24:33 +1100888 }
Damien Miller95def091999-11-25 00:26:21 +1100889 break;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000890
891 case 'D':
Damien Miller4bf648f2009-02-14 16:28:21 +1100892 if (parse_forward(&fwd, optarg, 1, 0)) {
Damien Millera699d952008-11-03 19:27:34 +1100893 add_local_forward(&options, &fwd);
Damien Millerf91ee4c2005-03-01 21:24:33 +1100894 } else {
Damien Millera699d952008-11-03 19:27:34 +1100895 fprintf(stderr,
896 "Bad dynamic forwarding specification "
897 "'%s'\n", optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100898 exit(255);
Ben Lindstrom146edb92001-04-11 23:06:28 +0000899 }
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000900 break;
901
Damien Miller95def091999-11-25 00:26:21 +1100902 case 'C':
903 options.compression = 1;
904 break;
Damien Miller1383bd82000-04-06 12:32:37 +1000905 case 'N':
906 no_shell_flag = 1;
Damien Miller21771e22011-05-15 08:45:50 +1000907 options.request_tty = REQUEST_TTY_NO;
Damien Miller1383bd82000-04-06 12:32:37 +1000908 break;
Damien Miller1383bd82000-04-06 12:32:37 +1000909 case 'T':
Damien Miller21771e22011-05-15 08:45:50 +1000910 options.request_tty = REQUEST_TTY_NO;
Damien Miller1383bd82000-04-06 12:32:37 +1000911 break;
Damien Miller95def091999-11-25 00:26:21 +1100912 case 'o':
Damien Miller9836cf82003-12-17 16:30:06 +1100913 line = xstrdup(optarg);
djm@openbsd.org957fbce2014-10-08 22:20:25 +0000914 if (process_config_line(&options, pw,
915 host ? host : "", host ? host : "", line,
916 "command-line", 0, NULL, SSHCONF_USERCONF) != 0)
Darren Tuckere9a9b712005-12-20 16:15:51 +1100917 exit(255);
Darren Tuckera627d422013-06-02 07:31:17 +1000918 free(line);
Damien Miller95def091999-11-25 00:26:21 +1100919 break;
Damien Miller832562e2001-01-30 09:30:01 +1100920 case 's':
921 subsystem_flag = 1;
922 break;
Damien Miller0e220db2004-06-15 10:34:08 +1000923 case 'S':
mmcc@openbsd.orgd59ce082015-12-10 17:08:40 +0000924 free(options.control_path);
Damien Miller0e220db2004-06-15 10:34:08 +1000925 options.control_path = xstrdup(optarg);
Damien Miller0e220db2004-06-15 10:34:08 +1000926 break;
Ben Lindstrome0f88042001-04-30 13:06:24 +0000927 case 'b':
928 options.bind_address = optarg;
929 break;
Ben Lindstrom14f31ab2001-09-12 17:48:04 +0000930 case 'F':
931 config = optarg;
932 break;
Damien Miller95def091999-11-25 00:26:21 +1100933 default:
934 usage();
935 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000936 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000937
Damien Millerf4614452001-07-14 12:18:10 +1000938 ac -= optind;
939 av += optind;
940
Darren Tuckerb8c884a2010-01-08 18:53:43 +1100941 if (ac > 0 && !host) {
Ben Lindstromc276c122002-12-23 02:14:51 +0000942 if (strrchr(*av, '@')) {
Damien Millerf4614452001-07-14 12:18:10 +1000943 p = xstrdup(*av);
Ben Lindstromc276c122002-12-23 02:14:51 +0000944 cp = strrchr(p, '@');
Damien Millerf4614452001-07-14 12:18:10 +1000945 if (cp == NULL || cp == p)
946 usage();
947 options.user = p;
948 *cp = '\0';
Damien Miller0faf7472013-10-17 11:47:23 +1100949 host = xstrdup(++cp);
Damien Millerf4614452001-07-14 12:18:10 +1000950 } else
Damien Miller0faf7472013-10-17 11:47:23 +1100951 host = xstrdup(*av);
Ben Lindstromb9fa6912002-12-23 02:24:54 +0000952 if (ac > 1) {
953 optind = optreset = 1;
Damien Millerf4614452001-07-14 12:18:10 +1000954 goto again;
955 }
Ben Lindstromb9fa6912002-12-23 02:24:54 +0000956 ac--, av++;
Damien Millerf4614452001-07-14 12:18:10 +1000957 }
958
Damien Miller95def091999-11-25 00:26:21 +1100959 /* Check that we got a host name. */
960 if (!host)
961 usage();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000962
Damien Miller0faf7472013-10-17 11:47:23 +1100963 host_arg = xstrdup(host);
964
Damien Miller1f0311c2014-05-15 14:24:09 +1000965#ifdef WITH_OPENSSL
Damien Miller4314c2b2010-09-10 11:12:09 +1000966 OpenSSL_add_all_algorithms();
Damien Miller0bc1bd82000-11-13 22:57:25 +1100967 ERR_load_crypto_strings();
Damien Miller1f0311c2014-05-15 14:24:09 +1000968#endif
Damien Millercb5e44a2000-09-29 12:12:36 +1100969
Damien Miller95def091999-11-25 00:26:21 +1100970 /* Initialize the command to execute on remote host. */
971 buffer_init(&command);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000972
Damien Miller5428f641999-11-25 11:54:57 +1100973 /*
974 * Save the command to execute on the remote host in a buffer. There
975 * is no limit on the length of the command, except by the maximum
976 * packet size. Also sets the tty flag if there is no command.
977 */
Damien Millerf4614452001-07-14 12:18:10 +1000978 if (!ac) {
Damien Miller95def091999-11-25 00:26:21 +1100979 /* No command specified - execute shell on a tty. */
Damien Miller832562e2001-01-30 09:30:01 +1100980 if (subsystem_flag) {
Damien Millerf4614452001-07-14 12:18:10 +1000981 fprintf(stderr,
982 "You must specify a subsystem to invoke.\n");
Damien Miller832562e2001-01-30 09:30:01 +1100983 usage();
984 }
Damien Miller95def091999-11-25 00:26:21 +1100985 } else {
Damien Millerf4614452001-07-14 12:18:10 +1000986 /* A command has been specified. Store it into the buffer. */
987 for (i = 0; i < ac; i++) {
988 if (i)
Damien Miller95def091999-11-25 00:26:21 +1100989 buffer_append(&command, " ", 1);
990 buffer_append(&command, av[i], strlen(av[i]));
991 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000992 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000993
Damien Miller95def091999-11-25 00:26:21 +1100994 /* Cannot fork to background if no command. */
Darren Tuckerd6173c02008-06-13 04:52:53 +1000995 if (fork_after_authentication_flag && buffer_len(&command) == 0 &&
996 !no_shell_flag)
997 fatal("Cannot fork into background without a command "
998 "to execute.");
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000999
Ben Lindstrom8a432f52001-03-05 07:24:46 +00001000 /*
1001 * Initialize "log" output. Since we are the client all output
Damien Miller03d4d7e2013-04-23 15:21:06 +10001002 * goes to stderr unless otherwise specified by -y or -E.
Ben Lindstrom8a432f52001-03-05 07:24:46 +00001003 */
Damien Miller03d4d7e2013-04-23 15:21:06 +10001004 if (use_syslog && logfile != NULL)
1005 fatal("Can't specify both -y and -E");
dtucker@openbsd.org4f7cc2f2015-09-04 08:21:47 +00001006 if (logfile != NULL)
Damien Miller03d4d7e2013-04-23 15:21:06 +10001007 log_redirect_stderr_to(logfile);
Darren Tucker72efd742009-06-21 17:48:00 +10001008 log_init(argv0,
Darren Tuckerd6173c02008-06-13 04:52:53 +10001009 options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level,
Damien Millere272a5b2008-11-03 19:22:37 +11001010 SYSLOG_FACILITY_USER, !use_syslog);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001011
Damien Miller03d4d7e2013-04-23 15:21:06 +10001012 if (debug_flag)
Damien Miller1f0311c2014-05-15 14:24:09 +10001013 logit("%s, %s", SSH_RELEASE,
1014#ifdef WITH_OPENSSL
1015 SSLeay_version(SSLEAY_VERSION)
1016#else
1017 "without OpenSSL"
1018#endif
1019 );
Damien Miller03d4d7e2013-04-23 15:21:06 +10001020
Damien Miller13f97b22014-02-24 15:57:55 +11001021 /* Parse the configuration files */
djm@openbsd.org957fbce2014-10-08 22:20:25 +00001022 process_config_files(host_arg, pw, 0);
Ben Lindstrom83f07d12001-10-03 17:22:29 +00001023
Damien Miller13f97b22014-02-24 15:57:55 +11001024 /* Hostname canonicalisation needs a few options filled. */
1025 fill_default_options_for_canonicalization(&options);
1026
1027 /* If the user has replaced the hostname then take it into use now */
1028 if (options.hostname != NULL) {
1029 /* NB. Please keep in sync with readconf.c:match_cfg_line() */
1030 cp = percent_expand(options.hostname,
1031 "h", host, (char *)NULL);
1032 free(host);
1033 host = cp;
djm@openbsd.org957fbce2014-10-08 22:20:25 +00001034 free(options.hostname);
1035 options.hostname = xstrdup(host);
Damien Miller13f97b22014-02-24 15:57:55 +11001036 }
1037
1038 /* If canonicalization requested then try to apply it */
1039 lowercase(host);
1040 if (options.canonicalize_hostname != SSH_CANONICALISE_NO)
1041 addrs = resolve_canonicalize(&host, options.port);
1042
1043 /*
Damien Miller08b57c62014-02-27 10:17:13 +11001044 * If CanonicalizePermittedCNAMEs have been specified but
1045 * other canonicalization did not happen (by not being requested
1046 * or by failing with fallback) then the hostname may still be changed
1047 * as a result of CNAME following.
1048 *
1049 * Try to resolve the bare hostname name using the system resolver's
1050 * usual search rules and then apply the CNAME follow rules.
1051 *
1052 * Skip the lookup if a ProxyCommand is being used unless the user
1053 * has specifically requested canonicalisation for this case via
1054 * CanonicalizeHostname=always
Damien Miller13f97b22014-02-24 15:57:55 +11001055 */
djm@openbsd.orged877ef2016-07-15 00:24:30 +00001056 direct = option_clear_or_none(options.proxy_command) &&
1057 options.jump_host == NULL;
1058 if (addrs == NULL && options.num_permitted_cnames != 0 && (direct ||
1059 options.canonicalize_hostname == SSH_CANONICALISE_ALWAYS)) {
Damien Miller19439e92014-07-02 15:28:40 +10001060 if ((addrs = resolve_host(host, options.port,
1061 option_clear_or_none(options.proxy_command),
1062 cname, sizeof(cname))) == NULL) {
1063 /* Don't fatal proxied host names not in the DNS */
1064 if (option_clear_or_none(options.proxy_command))
1065 cleanup_exit(255); /* logged in resolve_host */
1066 } else
djm@openbsd.orged877ef2016-07-15 00:24:30 +00001067 check_follow_cname(direct, &host, cname);
Damien Miller13f97b22014-02-24 15:57:55 +11001068 }
1069
1070 /*
djm@openbsd.org957fbce2014-10-08 22:20:25 +00001071 * If canonicalisation is enabled then re-parse the configuration
1072 * files as new stanzas may match.
Damien Miller13f97b22014-02-24 15:57:55 +11001073 */
djm@openbsd.org957fbce2014-10-08 22:20:25 +00001074 if (options.canonicalize_hostname != 0) {
1075 debug("Re-reading configuration after hostname "
1076 "canonicalisation");
1077 free(options.hostname);
1078 options.hostname = xstrdup(host);
1079 process_config_files(host_arg, pw, 1);
1080 /*
1081 * Address resolution happens early with canonicalisation
1082 * enabled and the port number may have changed since, so
1083 * reset it in address list
1084 */
1085 if (addrs != NULL && options.port > 0)
1086 set_addrinfo_port(addrs, options.port);
Ben Lindstrom14f31ab2001-09-12 17:48:04 +00001087 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001088
Damien Miller95def091999-11-25 00:26:21 +11001089 /* Fill configuration defaults. */
1090 fill_default_options(&options);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001091
djm@openbsd.orged877ef2016-07-15 00:24:30 +00001092 /*
1093 * If ProxyJump option specified, then construct a ProxyCommand now.
1094 */
1095 if (options.jump_host != NULL) {
1096 char port_s[8];
1097
1098 /* Consistency check */
1099 if (options.proxy_command != NULL)
1100 fatal("inconsistent options: ProxyCommand+ProxyJump");
1101 /* Never use FD passing for ProxyJump */
1102 options.proxy_use_fdpass = 0;
1103 snprintf(port_s, sizeof(port_s), "%d", options.jump_port);
1104 xasprintf(&options.proxy_command,
1105 "ssh%s%s%s%s%s%s%s%s%s%.*s -W %%h:%%p %s",
1106 /* Optional "-l user" argument if jump_user set */
1107 options.jump_user == NULL ? "" : " -l ",
1108 options.jump_user == NULL ? "" : options.jump_user,
1109 /* Optional "-p port" argument if jump_port set */
1110 options.jump_port <= 0 ? "" : " -p ",
1111 options.jump_port <= 0 ? "" : port_s,
1112 /* Optional additional jump hosts ",..." */
1113 options.jump_extra == NULL ? "" : " -J ",
1114 options.jump_extra == NULL ? "" : options.jump_extra,
1115 /* Optional "-F" argumment if -F specified */
1116 config == NULL ? "" : " -F ",
1117 config == NULL ? "" : config,
1118 /* Optional "-v" arguments if -v set */
1119 debug_flag ? " -" : "",
1120 debug_flag, "vvv",
1121 /* Mandatory hostname */
1122 options.jump_host);
1123 debug("Setting implicit ProxyCommand from ProxyJump: %s",
1124 options.proxy_command);
1125 }
1126
Damien Miller13f97b22014-02-24 15:57:55 +11001127 if (options.port == 0)
1128 options.port = default_ssh_port();
Darren Tucker0a4f04b2003-07-03 20:37:47 +10001129 channel_set_af(options.address_family);
1130
Damien Millere9fc72e2013-10-15 12:14:12 +11001131 /* Tidy and check options */
1132 if (options.host_key_alias != NULL)
1133 lowercase(options.host_key_alias);
1134 if (options.proxy_command != NULL &&
1135 strcmp(options.proxy_command, "-") == 0 &&
1136 options.proxy_use_fdpass)
1137 fatal("ProxyCommand=- and ProxyUseFDPass are incompatible");
djm@openbsd.org44732de2015-02-20 22:17:21 +00001138 if (options.control_persist &&
1139 options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK) {
1140 debug("UpdateHostKeys=ask is incompatible with ControlPersist; "
1141 "disabling");
1142 options.update_hostkeys = 0;
1143 }
djm@openbsd.org88b6fcd2015-11-19 08:23:27 +00001144 if (options.connection_attempts <= 0)
1145 fatal("Invalid number of ConnectionAttempts");
Damien Miller0faf7472013-10-17 11:47:23 +11001146#ifndef HAVE_CYGWIN
1147 if (original_effective_uid != 0)
1148 options.use_privileged_port = 0;
1149#endif
Damien Millere9fc72e2013-10-15 12:14:12 +11001150
Damien Miller95def091999-11-25 00:26:21 +11001151 /* reinit */
Darren Tucker72efd742009-06-21 17:48:00 +10001152 log_init(argv0, options.log_level, SYSLOG_FACILITY_USER, !use_syslog);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001153
Damien Millerfff9f092012-07-06 13:45:01 +10001154 if (options.request_tty == REQUEST_TTY_YES ||
1155 options.request_tty == REQUEST_TTY_FORCE)
1156 tty_flag = 1;
1157
1158 /* Allocate a tty by default if no command specified. */
1159 if (buffer_len(&command) == 0)
1160 tty_flag = options.request_tty != REQUEST_TTY_NO;
1161
1162 /* Force no tty */
markus@openbsd.org8d057842016-09-30 09:19:13 +00001163 if (options.request_tty == REQUEST_TTY_NO ||
1164 (muxclient_command && muxclient_command != SSHMUX_COMMAND_PROXY))
Damien Millerfff9f092012-07-06 13:45:01 +10001165 tty_flag = 0;
1166 /* Do not allocate a tty if stdin is not a tty. */
1167 if ((!isatty(fileno(stdin)) || stdin_null_flag) &&
1168 options.request_tty != REQUEST_TTY_FORCE) {
1169 if (tty_flag)
1170 logit("Pseudo-terminal will not be allocated because "
1171 "stdin is not a terminal.");
1172 tty_flag = 0;
1173 }
1174
Damien Miller60bc5172001-03-19 09:38:15 +11001175 seed_rng();
1176
Damien Miller95def091999-11-25 00:26:21 +11001177 if (options.user == NULL)
1178 options.user = xstrdup(pw->pw_name);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001179
Damien Millerdfc85fa2011-05-15 08:44:02 +10001180 if (gethostname(thishost, sizeof(thishost)) == -1)
1181 fatal("gethostname: %s", strerror(errno));
1182 strlcpy(shorthost, thishost, sizeof(shorthost));
1183 shorthost[strcspn(thishost, ".")] = '\0';
1184 snprintf(portstr, sizeof(portstr), "%d", options.port);
djm@openbsd.org674b3b62015-09-11 03:47:28 +00001185 snprintf(uidstr, sizeof(uidstr), "%d", pw->pw_uid);
Darren Tuckerf6b01b72008-06-13 04:56:37 +10001186
Damien Miller9c386432014-07-03 21:27:46 +10001187 if ((md = ssh_digest_start(SSH_DIGEST_SHA1)) == NULL ||
1188 ssh_digest_update(md, thishost, strlen(thishost)) < 0 ||
1189 ssh_digest_update(md, host, strlen(host)) < 0 ||
1190 ssh_digest_update(md, portstr, strlen(portstr)) < 0 ||
1191 ssh_digest_update(md, options.user, strlen(options.user)) < 0 ||
1192 ssh_digest_final(md, conn_hash, sizeof(conn_hash)) < 0)
1193 fatal("%s: mux digest failed", __func__);
1194 ssh_digest_free(md);
1195 conn_hash_hex = tohex(conn_hash, ssh_digest_bytes(SSH_DIGEST_SHA1));
1196
Damien Millerdfc85fa2011-05-15 08:44:02 +10001197 if (options.local_command != NULL) {
Darren Tuckerf6b01b72008-06-13 04:56:37 +10001198 debug3("expanding LocalCommand: %s", options.local_command);
1199 cp = options.local_command;
Damien Miller9c386432014-07-03 21:27:46 +10001200 options.local_command = percent_expand(cp,
1201 "C", conn_hash_hex,
1202 "L", shorthost,
1203 "d", pw->pw_dir,
1204 "h", host,
1205 "l", thishost,
1206 "n", host_arg,
1207 "p", portstr,
1208 "r", options.user,
1209 "u", pw->pw_name,
Damien Millerdfc85fa2011-05-15 08:44:02 +10001210 (char *)NULL);
Darren Tuckerf6b01b72008-06-13 04:56:37 +10001211 debug3("expanded LocalCommand: %s", options.local_command);
Darren Tuckera627d422013-06-02 07:31:17 +10001212 free(cp);
Darren Tuckerf6b01b72008-06-13 04:56:37 +10001213 }
1214
Damien Miller0e220db2004-06-15 10:34:08 +10001215 if (options.control_path != NULL) {
Damien Miller6476cad2005-06-16 13:18:34 +10001216 cp = tilde_expand_filename(options.control_path,
1217 original_real_uid);
Darren Tuckera627d422013-06-02 07:31:17 +10001218 free(options.control_path);
Damien Miller9c386432014-07-03 21:27:46 +10001219 options.control_path = percent_expand(cp,
1220 "C", conn_hash_hex,
1221 "L", shorthost,
1222 "h", host,
1223 "l", thishost,
1224 "n", host_arg,
1225 "p", portstr,
1226 "r", options.user,
1227 "u", pw->pw_name,
djm@openbsd.org674b3b62015-09-11 03:47:28 +00001228 "i", uidstr,
Damien Millerdfc85fa2011-05-15 08:44:02 +10001229 (char *)NULL);
Darren Tuckera627d422013-06-02 07:31:17 +10001230 free(cp);
Damien Miller0e220db2004-06-15 10:34:08 +10001231 }
Damien Miller9c386432014-07-03 21:27:46 +10001232 free(conn_hash_hex);
1233
djm@openbsd.org957fbce2014-10-08 22:20:25 +00001234 if (config_test) {
1235 dump_client_config(&options, host);
1236 exit(0);
1237 }
1238
Damien Millerb1cbfa22008-05-19 16:00:08 +10001239 if (muxclient_command != 0 && options.control_path == NULL)
Darren Tucker0814d312005-06-01 23:08:51 +10001240 fatal("No ControlPath specified for \"-O\" command");
markus@openbsd.org8d057842016-09-30 09:19:13 +00001241 if (options.control_path != NULL) {
1242 int sock;
1243 if ((sock = muxclient(options.control_path)) >= 0) {
1244 packet_set_connection(sock, sock);
1245 ssh = active_state; /* XXX */
1246 enable_compat20(); /* XXX */
1247 packet_set_mux();
1248 goto skip_connect;
1249 }
1250 }
Damien Miller0e220db2004-06-15 10:34:08 +10001251
Damien Miller08b57c62014-02-27 10:17:13 +11001252 /*
1253 * If hostname canonicalisation was not enabled, then we may not
1254 * have yet resolved the hostname. Do so now.
1255 */
1256 if (addrs == NULL && options.proxy_command == NULL) {
djm@openbsd.orga85768a2015-09-04 04:56:09 +00001257 debug2("resolving \"%s\" port %d", host, options.port);
Damien Miller08b57c62014-02-27 10:17:13 +11001258 if ((addrs = resolve_host(host, options.port, 1,
1259 cname, sizeof(cname))) == NULL)
1260 cleanup_exit(255); /* resolve_host logs the error */
1261 }
1262
Damien Miller67bd0622007-09-17 12:06:57 +10001263 timeout_ms = options.connection_timeout * 1000;
1264
Kevin Stevesfcec7f82000-12-15 19:55:48 +00001265 /* Open a connection to the remote host. */
Damien Miller0faf7472013-10-17 11:47:23 +11001266 if (ssh_connect(host, addrs, &hostaddr, options.port,
1267 options.address_family, options.connection_attempts,
1268 &timeout_ms, options.tcp_keep_alive,
1269 options.use_privileged_port) != 0)
1270 exit(255);
1271
Damien Miller28631ce2013-10-26 10:07:56 +11001272 if (addrs != NULL)
1273 freeaddrinfo(addrs);
1274
Damien Miller0faf7472013-10-17 11:47:23 +11001275 packet_set_timeout(options.server_alive_interval,
1276 options.server_alive_count_max);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001277
djm@openbsd.org95767262016-03-07 19:02:43 +00001278 ssh = active_state; /* XXX */
1279
Damien Miller67bd0622007-09-17 12:06:57 +10001280 if (timeout_ms > 0)
1281 debug3("timeout: %d ms remain after connect", timeout_ms);
1282
Damien Miller5428f641999-11-25 11:54:57 +11001283 /*
1284 * If we successfully made the connection, load the host private key
1285 * in case we will need it later for combined rsa-rhosts
1286 * authentication. This must be done before releasing extra
1287 * privileges, because the file is only readable by root.
Ben Lindstrom9e5bb572002-06-06 19:58:27 +00001288 * If we cannot access the private keys, load the public keys
1289 * instead and try to execute the ssh-keysign helper instead.
Damien Miller5428f641999-11-25 11:54:57 +11001290 */
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001291 sensitive_data.nkeys = 0;
1292 sensitive_data.keys = NULL;
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001293 sensitive_data.external_keysign = 0;
Ben Lindstrom24157572002-06-12 16:09:39 +00001294 if (options.rhosts_rsa_authentication ||
1295 options.hostbased_authentication) {
Damien Miller0fa47cf2013-12-29 17:53:39 +11001296 sensitive_data.nkeys = 9;
Damien Millerddd63ab2006-03-31 23:10:51 +11001297 sensitive_data.keys = xcalloc(sensitive_data.nkeys,
Ben Lindstroma962c2f2002-07-04 00:14:17 +00001298 sizeof(Key));
Damien Miller6af914a2010-09-10 11:39:26 +10001299 for (i = 0; i < sensitive_data.nkeys; i++)
1300 sensitive_data.keys[i] = NULL;
Ben Lindstromf9c48842002-06-11 16:37:51 +00001301
1302 PRIV_START;
djm@openbsd.org6091c362015-12-11 03:20:09 +00001303#if WITH_SSH1
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001304 sensitive_data.keys[0] = key_load_private_type(KEY_RSA1,
Darren Tucker232b76f2006-05-06 17:41:51 +10001305 _PATH_HOST_KEY_FILE, "", NULL, NULL);
djm@openbsd.org6091c362015-12-11 03:20:09 +00001306#endif
Damien Miller6af914a2010-09-10 11:39:26 +10001307#ifdef OPENSSL_HAS_ECC
djm@openbsd.orgab24ab82015-01-08 10:15:45 +00001308 sensitive_data.keys[1] = key_load_private_cert(KEY_ECDSA,
Damien Millereb8b60e2010-08-31 22:41:14 +10001309 _PATH_HOST_ECDSA_KEY_FILE, "", NULL);
Damien Miller6af914a2010-09-10 11:39:26 +10001310#endif
djm@openbsd.orgab24ab82015-01-08 10:15:45 +00001311 sensitive_data.keys[2] = key_load_private_cert(KEY_ED25519,
1312 _PATH_HOST_ED25519_KEY_FILE, "", NULL);
Damien Millereb8b60e2010-08-31 22:41:14 +10001313 sensitive_data.keys[3] = key_load_private_cert(KEY_RSA,
Damien Millerc1583312010-08-05 13:04:50 +10001314 _PATH_HOST_RSA_KEY_FILE, "", NULL);
djm@openbsd.orgab24ab82015-01-08 10:15:45 +00001315 sensitive_data.keys[4] = key_load_private_cert(KEY_DSA,
1316 _PATH_HOST_DSA_KEY_FILE, "", NULL);
Damien Miller6af914a2010-09-10 11:39:26 +10001317#ifdef OPENSSL_HAS_ECC
djm@openbsd.orgab24ab82015-01-08 10:15:45 +00001318 sensitive_data.keys[5] = key_load_private_type(KEY_ECDSA,
Damien Millereb8b60e2010-08-31 22:41:14 +10001319 _PATH_HOST_ECDSA_KEY_FILE, "", NULL, NULL);
Damien Miller6af914a2010-09-10 11:39:26 +10001320#endif
djm@openbsd.orgab24ab82015-01-08 10:15:45 +00001321 sensitive_data.keys[6] = key_load_private_type(KEY_ED25519,
1322 _PATH_HOST_ED25519_KEY_FILE, "", NULL, NULL);
Damien Miller0fa47cf2013-12-29 17:53:39 +11001323 sensitive_data.keys[7] = key_load_private_type(KEY_RSA,
Darren Tucker232b76f2006-05-06 17:41:51 +10001324 _PATH_HOST_RSA_KEY_FILE, "", NULL, NULL);
djm@openbsd.orgab24ab82015-01-08 10:15:45 +00001325 sensitive_data.keys[8] = key_load_private_type(KEY_DSA,
1326 _PATH_HOST_DSA_KEY_FILE, "", NULL, NULL);
Ben Lindstromf9c48842002-06-11 16:37:51 +00001327 PRIV_END;
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001328
Ben Lindstrom5d35a2f2002-07-04 00:19:40 +00001329 if (options.hostbased_authentication == 1 &&
1330 sensitive_data.keys[0] == NULL &&
Damien Millereb8b60e2010-08-31 22:41:14 +10001331 sensitive_data.keys[5] == NULL &&
Damien Miller5be9d9e2013-12-07 11:24:01 +11001332 sensitive_data.keys[6] == NULL &&
Damien Miller0fa47cf2013-12-29 17:53:39 +11001333 sensitive_data.keys[7] == NULL &&
1334 sensitive_data.keys[8] == NULL) {
Damien Miller6af914a2010-09-10 11:39:26 +10001335#ifdef OPENSSL_HAS_ECC
djm@openbsd.orgab24ab82015-01-08 10:15:45 +00001336 sensitive_data.keys[1] = key_load_cert(
Damien Millereb8b60e2010-08-31 22:41:14 +10001337 _PATH_HOST_ECDSA_KEY_FILE);
Damien Miller6af914a2010-09-10 11:39:26 +10001338#endif
djm@openbsd.orgab24ab82015-01-08 10:15:45 +00001339 sensitive_data.keys[2] = key_load_cert(
1340 _PATH_HOST_ED25519_KEY_FILE);
Damien Millereb8b60e2010-08-31 22:41:14 +10001341 sensitive_data.keys[3] = key_load_cert(
Damien Millerc1583312010-08-05 13:04:50 +10001342 _PATH_HOST_RSA_KEY_FILE);
Damien Miller0fa47cf2013-12-29 17:53:39 +11001343 sensitive_data.keys[4] = key_load_cert(
djm@openbsd.orgab24ab82015-01-08 10:15:45 +00001344 _PATH_HOST_DSA_KEY_FILE);
Damien Miller6af914a2010-09-10 11:39:26 +10001345#ifdef OPENSSL_HAS_ECC
djm@openbsd.orgab24ab82015-01-08 10:15:45 +00001346 sensitive_data.keys[5] = key_load_public(
Damien Millereb8b60e2010-08-31 22:41:14 +10001347 _PATH_HOST_ECDSA_KEY_FILE, NULL);
Damien Miller6af914a2010-09-10 11:39:26 +10001348#endif
djm@openbsd.orgab24ab82015-01-08 10:15:45 +00001349 sensitive_data.keys[6] = key_load_public(
1350 _PATH_HOST_ED25519_KEY_FILE, NULL);
Damien Miller5be9d9e2013-12-07 11:24:01 +11001351 sensitive_data.keys[7] = key_load_public(
Damien Miller0fa47cf2013-12-29 17:53:39 +11001352 _PATH_HOST_RSA_KEY_FILE, NULL);
1353 sensitive_data.keys[8] = key_load_public(
djm@openbsd.orgab24ab82015-01-08 10:15:45 +00001354 _PATH_HOST_DSA_KEY_FILE, NULL);
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001355 sensitive_data.external_keysign = 1;
1356 }
Damien Miller95def091999-11-25 00:26:21 +11001357 }
Damien Miller5428f641999-11-25 11:54:57 +11001358 /*
1359 * Get rid of any extra privileges that we may have. We will no
1360 * longer need them. Also, extra privileges could make it very hard
1361 * to read identity files and other non-world-readable files from the
1362 * user's home directory if it happens to be on a NFS volume where
1363 * root is mapped to nobody.
1364 */
Darren Tucker25f60a72004-08-15 17:23:34 +10001365 if (original_effective_uid == 0) {
1366 PRIV_START;
1367 permanently_set_uid(pw);
1368 }
Damien Miller95def091999-11-25 00:26:21 +11001369
Damien Miller5428f641999-11-25 11:54:57 +11001370 /*
1371 * Now that we are back to our own permissions, create ~/.ssh
Damien Miller788f2122005-11-05 15:14:59 +11001372 * directory if it doesn't already exist.
Damien Miller5428f641999-11-25 11:54:57 +11001373 */
Darren Tucker45c66d72011-11-04 10:50:40 +11001374 if (config == NULL) {
1375 r = snprintf(buf, sizeof buf, "%s%s%s", pw->pw_dir,
1376 strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR);
1377 if (r > 0 && (size_t)r < sizeof(buf) && stat(buf, &st) < 0) {
Darren Tucker8ccb7392010-09-10 12:28:24 +10001378#ifdef WITH_SELINUX
Darren Tucker45c66d72011-11-04 10:50:40 +11001379 ssh_selinux_setfscreatecon(buf);
Darren Tucker8ccb7392010-09-10 12:28:24 +10001380#endif
Darren Tucker45c66d72011-11-04 10:50:40 +11001381 if (mkdir(buf, 0700) < 0)
1382 error("Could not create directory '%.200s'.",
1383 buf);
Darren Tucker8ccb7392010-09-10 12:28:24 +10001384#ifdef WITH_SELINUX
Darren Tucker45c66d72011-11-04 10:50:40 +11001385 ssh_selinux_setfscreatecon(NULL);
Darren Tucker8ccb7392010-09-10 12:28:24 +10001386#endif
Darren Tucker45c66d72011-11-04 10:50:40 +11001387 }
Darren Tucker8ccb7392010-09-10 12:28:24 +10001388 }
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001389 /* load options.identity_files */
1390 load_public_identity_files();
1391
markus@openbsd.orgb02ad1c2016-05-04 12:21:53 +00001392 /* optionally set the SSH_AUTHSOCKET_ENV_NAME varibale */
markus@openbsd.org1a75d142016-05-04 14:29:58 +00001393 if (options.identity_agent &&
1394 strcmp(options.identity_agent, SSH_AUTHSOCKET_ENV_NAME) != 0) {
markus@openbsd.orgb02ad1c2016-05-04 12:21:53 +00001395 if (strcmp(options.identity_agent, "none") == 0) {
1396 unsetenv(SSH_AUTHSOCKET_ENV_NAME);
1397 } else {
1398 p = tilde_expand_filename(options.identity_agent,
1399 original_real_uid);
1400 cp = percent_expand(p, "d", pw->pw_dir,
1401 "u", pw->pw_name, "l", thishost, "h", host,
1402 "r", options.user, (char *)NULL);
1403 setenv(SSH_AUTHSOCKET_ENV_NAME, cp, 1);
1404 free(cp);
1405 free(p);
1406 }
1407 }
1408
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001409 /* Expand ~ in known host file names. */
Damien Miller295ee632011-05-29 21:42:31 +10001410 tilde_expand_paths(options.system_hostfiles,
1411 options.num_system_hostfiles);
1412 tilde_expand_paths(options.user_hostfiles, options.num_user_hostfiles);
Damien Miller95def091999-11-25 00:26:21 +11001413
Damien Miller07cd5892001-11-12 10:52:03 +11001414 signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
Damien Miller857b02e2010-09-24 22:02:56 +10001415 signal(SIGCHLD, main_sigchld_handler);
Damien Miller07cd5892001-11-12 10:52:03 +11001416
Darren Tuckerd6173c02008-06-13 04:52:53 +10001417 /* Log into the remote system. Never returns if the login fails. */
Damien Miller67bd0622007-09-17 12:06:57 +10001418 ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr,
Damien Millerd925dcd2010-12-01 12:21:51 +11001419 options.port, pw, timeout_ms);
Damien Miller95def091999-11-25 00:26:21 +11001420
Damien Miller383ffe62010-06-26 10:02:03 +10001421 if (packet_connection_is_on_socket()) {
1422 verbose("Authenticated to %s ([%s]:%d).", host,
djm@openbsd.org95767262016-03-07 19:02:43 +00001423 ssh_remote_ipaddr(ssh), ssh_remote_port(ssh));
Damien Miller383ffe62010-06-26 10:02:03 +10001424 } else {
1425 verbose("Authenticated to %s (via proxy).", host);
1426 }
1427
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001428 /* We no longer need the private host keys. Clear them now. */
1429 if (sensitive_data.nkeys != 0) {
1430 for (i = 0; i < sensitive_data.nkeys; i++) {
1431 if (sensitive_data.keys[i] != NULL) {
1432 /* Destroys contents safely */
1433 debug3("clear hostkey %d", i);
1434 key_free(sensitive_data.keys[i]);
1435 sensitive_data.keys[i] = NULL;
1436 }
1437 }
Darren Tuckera627d422013-06-02 07:31:17 +10001438 free(sensitive_data.keys);
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001439 }
Ben Lindstroma6c8a8d2001-08-06 21:42:00 +00001440 for (i = 0; i < options.num_identity_files; i++) {
Darren Tuckera627d422013-06-02 07:31:17 +10001441 free(options.identity_files[i]);
1442 options.identity_files[i] = NULL;
Ben Lindstroma6c8a8d2001-08-06 21:42:00 +00001443 if (options.identity_keys[i]) {
1444 key_free(options.identity_keys[i]);
1445 options.identity_keys[i] = NULL;
1446 }
1447 }
djm@openbsd.org4e44a792015-09-24 06:15:11 +00001448 for (i = 0; i < options.num_certificate_files; i++) {
1449 free(options.certificate_files[i]);
1450 options.certificate_files[i] = NULL;
1451 }
Damien Miller95def091999-11-25 00:26:21 +11001452
markus@openbsd.org8d057842016-09-30 09:19:13 +00001453 skip_connect:
Damien Miller1383bd82000-04-06 12:32:37 +10001454 exit_status = compat20 ? ssh_session2() : ssh_session();
1455 packet_close();
Damien Miller8c4e18a2002-09-19 12:05:02 +10001456
Damien Millerb1cbfa22008-05-19 16:00:08 +10001457 if (options.control_path != NULL && muxserver_sock != -1)
Damien Miller0e220db2004-06-15 10:34:08 +10001458 unlink(options.control_path);
1459
Damien Millera41ccca2010-10-07 22:07:32 +11001460 /* Kill ProxyCommand if it is running. */
1461 ssh_kill_proxy_command();
Damien Miller8c4e18a2002-09-19 12:05:02 +10001462
Damien Miller1383bd82000-04-06 12:32:37 +10001463 return exit_status;
1464}
1465
Damien Millere11e1ea2010-08-03 16:04:46 +10001466static void
1467control_persist_detach(void)
1468{
1469 pid_t pid;
djm@openbsd.orgd2d6bf82016-04-29 08:07:53 +00001470 int devnull, keep_stderr;
Damien Millere11e1ea2010-08-03 16:04:46 +10001471
1472 debug("%s: backgrounding master process", __func__);
1473
1474 /*
1475 * master (current process) into the background, and make the
1476 * foreground process a client of the backgrounded master.
1477 */
1478 switch ((pid = fork())) {
1479 case -1:
1480 fatal("%s: fork: %s", __func__, strerror(errno));
1481 case 0:
1482 /* Child: master process continues mainloop */
1483 break;
1484 default:
1485 /* Parent: set up mux slave to connect to backgrounded master */
1486 debug2("%s: background process is %ld", __func__, (long)pid);
1487 stdin_null_flag = ostdin_null_flag;
Damien Miller21771e22011-05-15 08:45:50 +10001488 options.request_tty = orequest_tty;
Damien Millere11e1ea2010-08-03 16:04:46 +10001489 tty_flag = otty_flag;
1490 close(muxserver_sock);
1491 muxserver_sock = -1;
Damien Miller5929c522010-09-10 11:17:02 +10001492 options.control_master = SSHCTL_MASTER_NO;
Damien Millere11e1ea2010-08-03 16:04:46 +10001493 muxclient(options.control_path);
1494 /* muxclient() doesn't return on success. */
1495 fatal("Failed to connect to new control master");
1496 }
Damien Miller00d9ae22010-08-17 01:59:31 +10001497 if ((devnull = open(_PATH_DEVNULL, O_RDWR)) == -1) {
1498 error("%s: open(\"/dev/null\"): %s", __func__,
1499 strerror(errno));
1500 } else {
djm@openbsd.orgd2d6bf82016-04-29 08:07:53 +00001501 keep_stderr = log_is_on_stderr() && debug_flag;
Damien Miller00d9ae22010-08-17 01:59:31 +10001502 if (dup2(devnull, STDIN_FILENO) == -1 ||
djm@openbsd.orgd2d6bf82016-04-29 08:07:53 +00001503 dup2(devnull, STDOUT_FILENO) == -1 ||
1504 (!keep_stderr && dup2(devnull, STDERR_FILENO) == -1))
Damien Miller00d9ae22010-08-17 01:59:31 +10001505 error("%s: dup2: %s", __func__, strerror(errno));
1506 if (devnull > STDERR_FILENO)
1507 close(devnull);
1508 }
Damien Miller98e27dc2013-07-25 11:55:52 +10001509 daemon(1, 1);
Damien Millerea2c1a42011-06-03 12:10:22 +10001510 setproctitle("%s [mux]", options.control_path);
Damien Millere11e1ea2010-08-03 16:04:46 +10001511}
1512
1513/* Do fork() after authentication. Used by "ssh -f" */
1514static void
1515fork_postauth(void)
1516{
1517 if (need_controlpersist_detach)
1518 control_persist_detach();
1519 debug("forking to background");
1520 fork_after_authentication_flag = 0;
1521 if (daemon(1, 1) < 0)
1522 fatal("daemon() failed: %.200s", strerror(errno));
1523}
1524
Darren Tucker9f407c42008-06-13 04:50:27 +10001525/* Callback for remote forward global requests */
1526static void
1527ssh_confirm_remote_forward(int type, u_int32_t seq, void *ctxt)
1528{
Damien Miller7acefbb2014-07-18 14:11:24 +10001529 struct Forward *rfwd = (struct Forward *)ctxt;
Darren Tucker9f407c42008-06-13 04:50:27 +10001530
Damien Miller4bf648f2009-02-14 16:28:21 +11001531 /* XXX verbose() on failure? */
Damien Miller4b3ed642014-07-02 15:29:40 +10001532 debug("remote forward %s for: listen %s%s%d, connect %s:%d",
Darren Tucker9f407c42008-06-13 04:50:27 +10001533 type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
Damien Miller7acefbb2014-07-18 14:11:24 +10001534 rfwd->listen_path ? rfwd->listen_path :
1535 rfwd->listen_host ? rfwd->listen_host : "",
1536 (rfwd->listen_path || rfwd->listen_host) ? ":" : "",
1537 rfwd->listen_port, rfwd->connect_path ? rfwd->connect_path :
1538 rfwd->connect_host, rfwd->connect_port);
1539 if (rfwd->listen_path == NULL && rfwd->listen_port == 0) {
Darren Tucker68afb8c2011-10-02 18:59:03 +11001540 if (type == SSH2_MSG_REQUEST_SUCCESS) {
1541 rfwd->allocated_port = packet_get_int();
1542 logit("Allocated port %u for remote forward to %s:%d",
1543 rfwd->allocated_port,
1544 rfwd->connect_host, rfwd->connect_port);
1545 channel_update_permitted_opens(rfwd->handle,
1546 rfwd->allocated_port);
1547 } else {
1548 channel_update_permitted_opens(rfwd->handle, -1);
1549 }
Damien Miller4bf648f2009-02-14 16:28:21 +11001550 }
1551
Darren Tucker9f407c42008-06-13 04:50:27 +10001552 if (type == SSH2_MSG_REQUEST_FAILURE) {
Damien Miller7acefbb2014-07-18 14:11:24 +10001553 if (options.exit_on_forward_failure) {
1554 if (rfwd->listen_path != NULL)
1555 fatal("Error: remote port forwarding failed "
1556 "for listen path %s", rfwd->listen_path);
1557 else
1558 fatal("Error: remote port forwarding failed "
1559 "for listen port %d", rfwd->listen_port);
1560 } else {
1561 if (rfwd->listen_path != NULL)
1562 logit("Warning: remote port forwarding failed "
1563 "for listen path %s", rfwd->listen_path);
1564 else
1565 logit("Warning: remote port forwarding failed "
1566 "for listen port %d", rfwd->listen_port);
1567 }
Darren Tucker9f407c42008-06-13 04:50:27 +10001568 }
Darren Tucker9a2a6092008-07-04 12:53:50 +10001569 if (++remote_forward_confirms_received == options.num_remote_forwards) {
Darren Tucker9f407c42008-06-13 04:50:27 +10001570 debug("All remote forwarding requests processed");
Damien Millere11e1ea2010-08-03 16:04:46 +10001571 if (fork_after_authentication_flag)
1572 fork_postauth();
Darren Tucker9a2a6092008-07-04 12:53:50 +10001573 }
Darren Tucker9f407c42008-06-13 04:50:27 +10001574}
1575
Ben Lindstrombba81212001-06-25 05:01:22 +00001576static void
Darren Tucker7ad8dd22010-01-12 19:40:27 +11001577client_cleanup_stdio_fwd(int id, void *arg)
1578{
1579 debug("stdio forwarding: done");
1580 cleanup_exit(0);
1581}
1582
Darren Tucker2d6665d2011-11-04 10:54:22 +11001583static void
Damien Miller357610d2014-07-18 15:04:10 +10001584ssh_stdio_confirm(int id, int success, void *arg)
1585{
1586 if (!success)
1587 fatal("stdio forwarding failed");
1588}
1589
1590static void
Darren Tucker2d6665d2011-11-04 10:54:22 +11001591ssh_init_stdio_forwarding(void)
Darren Tucker7ad8dd22010-01-12 19:40:27 +11001592{
1593 Channel *c;
Damien Millere1537f92010-01-26 13:26:22 +11001594 int in, out;
Darren Tucker7ad8dd22010-01-12 19:40:27 +11001595
dtucker@openbsd.org8543ff32016-06-03 03:14:41 +00001596 if (options.stdio_forward_host == NULL)
Darren Tucker2d6665d2011-11-04 10:54:22 +11001597 return;
Damien Miller386feab2013-10-15 12:14:49 +11001598 if (!compat20)
Darren Tucker2d6665d2011-11-04 10:54:22 +11001599 fatal("stdio forwarding require Protocol 2");
Damien Millere1537f92010-01-26 13:26:22 +11001600
dtucker@openbsd.org8543ff32016-06-03 03:14:41 +00001601 debug3("%s: %s:%d", __func__, options.stdio_forward_host,
1602 options.stdio_forward_port);
Darren Tucker2d6665d2011-11-04 10:54:22 +11001603
1604 if ((in = dup(STDIN_FILENO)) < 0 ||
1605 (out = dup(STDOUT_FILENO)) < 0)
Damien Millere1537f92010-01-26 13:26:22 +11001606 fatal("channel_connect_stdio_fwd: dup() in/out failed");
dtucker@openbsd.org8543ff32016-06-03 03:14:41 +00001607 if ((c = channel_connect_stdio_fwd(options.stdio_forward_host,
1608 options.stdio_forward_port, in, out)) == NULL)
Darren Tucker2d6665d2011-11-04 10:54:22 +11001609 fatal("%s: channel_connect_stdio_fwd failed", __func__);
Darren Tucker7ad8dd22010-01-12 19:40:27 +11001610 channel_register_cleanup(c->self, client_cleanup_stdio_fwd, 0);
Damien Miller357610d2014-07-18 15:04:10 +10001611 channel_register_open_confirm(c->self, ssh_stdio_confirm, NULL);
Darren Tucker7ad8dd22010-01-12 19:40:27 +11001612}
1613
1614static void
Damien Miller0bc1bd82000-11-13 22:57:25 +11001615ssh_init_forwarding(void)
1616{
Kevin Steves12057502001-02-05 14:54:34 +00001617 int success = 0;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001618 int i;
Kevin Steves12057502001-02-05 14:54:34 +00001619
Damien Miller0bc1bd82000-11-13 22:57:25 +11001620 /* Initiate local TCP/IP port forwardings. */
1621 for (i = 0; i < options.num_local_forwards; i++) {
Damien Millerf91ee4c2005-03-01 21:24:33 +11001622 debug("Local connections to %.200s:%d forwarded to remote "
1623 "address %.200s:%d",
Damien Miller7acefbb2014-07-18 14:11:24 +10001624 (options.local_forwards[i].listen_path != NULL) ?
1625 options.local_forwards[i].listen_path :
Darren Tucker47eede72005-03-14 23:08:12 +11001626 (options.local_forwards[i].listen_host == NULL) ?
Damien Miller7acefbb2014-07-18 14:11:24 +10001627 (options.fwd_opts.gateway_ports ? "*" : "LOCALHOST") :
Damien Millerf91ee4c2005-03-01 21:24:33 +11001628 options.local_forwards[i].listen_host,
1629 options.local_forwards[i].listen_port,
Damien Miller7acefbb2014-07-18 14:11:24 +10001630 (options.local_forwards[i].connect_path != NULL) ?
1631 options.local_forwards[i].connect_path :
Damien Millerf91ee4c2005-03-01 21:24:33 +11001632 options.local_forwards[i].connect_host,
1633 options.local_forwards[i].connect_port);
Damien Millerb16461c2002-01-22 23:29:22 +11001634 success += channel_setup_local_fwd_listener(
Damien Miller7acefbb2014-07-18 14:11:24 +10001635 &options.local_forwards[i], &options.fwd_opts);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001636 }
Darren Tuckere7d4b192006-07-12 22:17:10 +10001637 if (i > 0 && success != i && options.exit_on_forward_failure)
1638 fatal("Could not request local forwarding.");
Kevin Steves12057502001-02-05 14:54:34 +00001639 if (i > 0 && success == 0)
1640 error("Could not request local forwarding.");
Damien Miller0bc1bd82000-11-13 22:57:25 +11001641
1642 /* Initiate remote TCP/IP port forwardings. */
1643 for (i = 0; i < options.num_remote_forwards; i++) {
Damien Millerf91ee4c2005-03-01 21:24:33 +11001644 debug("Remote connections from %.200s:%d forwarded to "
1645 "local address %.200s:%d",
Damien Miller7acefbb2014-07-18 14:11:24 +10001646 (options.remote_forwards[i].listen_path != NULL) ?
1647 options.remote_forwards[i].listen_path :
Damien Miller46d38de2005-07-17 17:02:09 +10001648 (options.remote_forwards[i].listen_host == NULL) ?
Damien Milleraa3bb102005-11-05 15:12:59 +11001649 "LOCALHOST" : options.remote_forwards[i].listen_host,
Damien Millerf91ee4c2005-03-01 21:24:33 +11001650 options.remote_forwards[i].listen_port,
Damien Miller7acefbb2014-07-18 14:11:24 +10001651 (options.remote_forwards[i].connect_path != NULL) ?
1652 options.remote_forwards[i].connect_path :
Damien Millerf91ee4c2005-03-01 21:24:33 +11001653 options.remote_forwards[i].connect_host,
1654 options.remote_forwards[i].connect_port);
Darren Tucker68afb8c2011-10-02 18:59:03 +11001655 options.remote_forwards[i].handle =
1656 channel_request_remote_forwarding(
Damien Miller7acefbb2014-07-18 14:11:24 +10001657 &options.remote_forwards[i]);
Darren Tucker68afb8c2011-10-02 18:59:03 +11001658 if (options.remote_forwards[i].handle < 0) {
Darren Tuckere7d4b192006-07-12 22:17:10 +10001659 if (options.exit_on_forward_failure)
1660 fatal("Could not request remote forwarding.");
1661 else
1662 logit("Warning: Could not request remote "
1663 "forwarding.");
Darren Tucker68afb8c2011-10-02 18:59:03 +11001664 } else {
1665 client_register_global_confirm(ssh_confirm_remote_forward,
1666 &options.remote_forwards[i]);
Darren Tuckere7d4b192006-07-12 22:17:10 +10001667 }
Damien Miller0bc1bd82000-11-13 22:57:25 +11001668 }
Damien Millerb3ce9fe2007-08-08 14:32:41 +10001669
1670 /* Initiate tunnel forwarding. */
1671 if (options.tun_open != SSH_TUNMODE_NO) {
1672 if (client_request_tun_fwd(options.tun_open,
1673 options.tun_local, options.tun_remote) == -1) {
1674 if (options.exit_on_forward_failure)
1675 fatal("Could not request tunnel forwarding.");
1676 else
1677 error("Could not request tunnel forwarding.");
1678 }
1679 }
Damien Miller0bc1bd82000-11-13 22:57:25 +11001680}
1681
Ben Lindstrombba81212001-06-25 05:01:22 +00001682static void
Damien Miller0bc1bd82000-11-13 22:57:25 +11001683check_agent_present(void)
1684{
djm@openbsd.org141efe42015-01-14 20:05:27 +00001685 int r;
1686
Damien Miller0bc1bd82000-11-13 22:57:25 +11001687 if (options.forward_agent) {
Damien Miller788f2122005-11-05 15:14:59 +11001688 /* Clear agent forwarding if we don't have an agent. */
djm@openbsd.org141efe42015-01-14 20:05:27 +00001689 if ((r = ssh_get_authentication_socket(NULL)) != 0) {
Damien Miller0bc1bd82000-11-13 22:57:25 +11001690 options.forward_agent = 0;
djm@openbsd.org141efe42015-01-14 20:05:27 +00001691 if (r != SSH_ERR_AGENT_NOT_PRESENT)
1692 debug("ssh_get_authentication_socket: %s",
1693 ssh_err(r));
1694 }
Damien Miller0bc1bd82000-11-13 22:57:25 +11001695 }
1696}
1697
Ben Lindstrombba81212001-06-25 05:01:22 +00001698static int
Damien Miller1383bd82000-04-06 12:32:37 +10001699ssh_session(void)
1700{
1701 int type;
Damien Miller1383bd82000-04-06 12:32:37 +10001702 int interactive = 0;
1703 int have_tty = 0;
1704 struct winsize ws;
Damien Miller1383bd82000-04-06 12:32:37 +10001705 char *cp;
Damien Miller17e7ed02005-06-17 12:54:33 +10001706 const char *display;
djm@openbsd.orged4ce822016-01-13 23:04:47 +00001707 char *proto = NULL, *data = NULL;
Damien Miller1383bd82000-04-06 12:32:37 +10001708
Damien Miller95def091999-11-25 00:26:21 +11001709 /* Enable compression if requested. */
1710 if (options.compression) {
Darren Tuckerd6173c02008-06-13 04:52:53 +10001711 debug("Requesting compression at level %d.",
1712 options.compression_level);
Damien Miller95def091999-11-25 00:26:21 +11001713
Darren Tuckerd6173c02008-06-13 04:52:53 +10001714 if (options.compression_level < 1 ||
1715 options.compression_level > 9)
1716 fatal("Compression level must be from 1 (fast) to "
1717 "9 (slow, best).");
Damien Miller95def091999-11-25 00:26:21 +11001718
1719 /* Send the request. */
1720 packet_start(SSH_CMSG_REQUEST_COMPRESSION);
1721 packet_put_int(options.compression_level);
1722 packet_send();
1723 packet_write_wait();
Damien Millerdff50992002-01-22 23:16:32 +11001724 type = packet_read();
Damien Miller95def091999-11-25 00:26:21 +11001725 if (type == SSH_SMSG_SUCCESS)
1726 packet_start_compression(options.compression_level);
1727 else if (type == SSH_SMSG_FAILURE)
Damien Miller996acd22003-04-09 20:59:48 +10001728 logit("Warning: Remote host refused compression.");
Damien Miller95def091999-11-25 00:26:21 +11001729 else
Darren Tuckerd6173c02008-06-13 04:52:53 +10001730 packet_disconnect("Protocol error waiting for "
1731 "compression response.");
Damien Miller95def091999-11-25 00:26:21 +11001732 }
1733 /* Allocate a pseudo tty if appropriate. */
1734 if (tty_flag) {
1735 debug("Requesting pty.");
1736
1737 /* Start the packet. */
1738 packet_start(SSH_CMSG_REQUEST_PTY);
1739
1740 /* Store TERM in the packet. There is no limit on the
1741 length of the string. */
1742 cp = getenv("TERM");
1743 if (!cp)
1744 cp = "";
Ben Lindstrom664408d2001-06-09 01:42:01 +00001745 packet_put_cstring(cp);
Damien Miller95def091999-11-25 00:26:21 +11001746
1747 /* Store window size in the packet. */
1748 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
1749 memset(&ws, 0, sizeof(ws));
Damien Miller71a73672006-03-26 14:04:36 +11001750 packet_put_int((u_int)ws.ws_row);
1751 packet_put_int((u_int)ws.ws_col);
1752 packet_put_int((u_int)ws.ws_xpixel);
1753 packet_put_int((u_int)ws.ws_ypixel);
Damien Miller95def091999-11-25 00:26:21 +11001754
1755 /* Store tty modes in the packet. */
Ben Lindstromae8e2d32001-04-14 23:13:02 +00001756 tty_make_modes(fileno(stdin), NULL);
Damien Miller95def091999-11-25 00:26:21 +11001757
1758 /* Send the packet, and wait for it to leave. */
1759 packet_send();
1760 packet_write_wait();
1761
1762 /* Read response from the server. */
Damien Millerdff50992002-01-22 23:16:32 +11001763 type = packet_read();
Damien Miller450a7a12000-03-26 13:04:51 +10001764 if (type == SSH_SMSG_SUCCESS) {
Damien Miller95def091999-11-25 00:26:21 +11001765 interactive = 1;
Damien Miller1383bd82000-04-06 12:32:37 +10001766 have_tty = 1;
Damien Miller450a7a12000-03-26 13:04:51 +10001767 } else if (type == SSH_SMSG_FAILURE)
Darren Tuckerd6173c02008-06-13 04:52:53 +10001768 logit("Warning: Remote host failed or refused to "
1769 "allocate a pseudo tty.");
Damien Miller95def091999-11-25 00:26:21 +11001770 else
Darren Tuckerd6173c02008-06-13 04:52:53 +10001771 packet_disconnect("Protocol error waiting for pty "
1772 "request response.");
Damien Miller95def091999-11-25 00:26:21 +11001773 }
1774 /* Request X11 forwarding if enabled and DISPLAY is set. */
Damien Miller17e7ed02005-06-17 12:54:33 +10001775 display = getenv("DISPLAY");
djm@openbsd.orga58be332015-04-17 13:16:48 +00001776 if (display == NULL && options.forward_x11)
1777 debug("X11 forwarding requested but DISPLAY not set");
djm@openbsd.orged4ce822016-01-13 23:04:47 +00001778 if (options.forward_x11 && client_x11_get_proto(display,
1779 options.xauth_location, options.forward_x11_trusted,
1780 options.forward_x11_timeout, &proto, &data) == 0) {
Damien Millerbd483e72000-04-30 10:00:53 +10001781 /* Request forwarding with authentication spoofing. */
Darren Tuckerd6173c02008-06-13 04:52:53 +10001782 debug("Requesting X11 forwarding with authentication "
1783 "spoofing.");
Damien Miller6d7b4372011-06-23 08:31:57 +10001784 x11_request_forwarding_with_spoofing(0, display, proto,
1785 data, 0);
Damien Miller95def091999-11-25 00:26:21 +11001786 /* Read response from the server. */
Damien Millerdff50992002-01-22 23:16:32 +11001787 type = packet_read();
Damien Miller95def091999-11-25 00:26:21 +11001788 if (type == SSH_SMSG_SUCCESS) {
Damien Miller95def091999-11-25 00:26:21 +11001789 interactive = 1;
Damien Millerbd483e72000-04-30 10:00:53 +10001790 } else if (type == SSH_SMSG_FAILURE) {
Damien Miller996acd22003-04-09 20:59:48 +10001791 logit("Warning: Remote host denied X11 forwarding.");
Damien Millerbd483e72000-04-30 10:00:53 +10001792 } else {
Darren Tuckerd6173c02008-06-13 04:52:53 +10001793 packet_disconnect("Protocol error waiting for X11 "
1794 "forwarding");
Damien Millerbd483e72000-04-30 10:00:53 +10001795 }
Damien Miller95def091999-11-25 00:26:21 +11001796 }
1797 /* Tell the packet module whether this is an interactive session. */
Damien Miller0dac6fb2010-11-20 15:19:38 +11001798 packet_set_interactive(interactive,
1799 options.ip_qos_interactive, options.ip_qos_bulk);
Damien Miller95def091999-11-25 00:26:21 +11001800
1801 /* Request authentication agent forwarding if appropriate. */
Damien Miller0bc1bd82000-11-13 22:57:25 +11001802 check_agent_present();
1803
Damien Miller95def091999-11-25 00:26:21 +11001804 if (options.forward_agent) {
1805 debug("Requesting authentication agent forwarding.");
1806 auth_request_forwarding();
1807
1808 /* Read response from the server. */
Damien Millerdff50992002-01-22 23:16:32 +11001809 type = packet_read();
Damien Miller48b03fc2002-01-22 23:11:40 +11001810 packet_check_eom();
Damien Miller95def091999-11-25 00:26:21 +11001811 if (type != SSH_SMSG_SUCCESS)
Damien Miller996acd22003-04-09 20:59:48 +10001812 logit("Warning: Remote host denied authentication agent forwarding.");
Damien Miller95def091999-11-25 00:26:21 +11001813 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001814
Damien Miller0bc1bd82000-11-13 22:57:25 +11001815 /* Initiate port forwardings. */
Darren Tucker2d6665d2011-11-04 10:54:22 +11001816 ssh_init_stdio_forwarding();
Damien Miller0bc1bd82000-11-13 22:57:25 +11001817 ssh_init_forwarding();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001818
Darren Tuckerb776c852007-12-02 23:06:35 +11001819 /* Execute a local command */
1820 if (options.local_command != NULL &&
1821 options.permit_local_command)
1822 ssh_local_cmd(options.local_command);
1823
Darren Tucker9a2a6092008-07-04 12:53:50 +10001824 /*
1825 * If requested and we are not interested in replies to remote
1826 * forwarding requests, then let ssh continue in the background.
1827 */
Damien Millere11e1ea2010-08-03 16:04:46 +10001828 if (fork_after_authentication_flag) {
1829 if (options.exit_on_forward_failure &&
1830 options.num_remote_forwards > 0) {
1831 debug("deferring postauth fork until remote forward "
1832 "confirmation received");
1833 } else
1834 fork_postauth();
Darren Tucker9a2a6092008-07-04 12:53:50 +10001835 }
Damien Miller5428f641999-11-25 11:54:57 +11001836
1837 /*
1838 * If a command was specified on the command line, execute the
1839 * command now. Otherwise request the server to start a shell.
1840 */
Damien Miller95def091999-11-25 00:26:21 +11001841 if (buffer_len(&command) > 0) {
1842 int len = buffer_len(&command);
1843 if (len > 900)
1844 len = 900;
Darren Tuckerd6173c02008-06-13 04:52:53 +10001845 debug("Sending command: %.*s", len,
1846 (u_char *)buffer_ptr(&command));
Damien Miller95def091999-11-25 00:26:21 +11001847 packet_start(SSH_CMSG_EXEC_CMD);
1848 packet_put_string(buffer_ptr(&command), buffer_len(&command));
1849 packet_send();
1850 packet_write_wait();
1851 } else {
1852 debug("Requesting shell.");
1853 packet_start(SSH_CMSG_EXEC_SHELL);
1854 packet_send();
1855 packet_write_wait();
1856 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001857
Damien Miller95def091999-11-25 00:26:21 +11001858 /* Enter the interactive session. */
Ben Lindstrom2b1f71b2001-06-05 20:32:21 +00001859 return client_loop(have_tty, tty_flag ?
1860 options.escape_char : SSH_ESCAPECHAR_NONE, 0);
Damien Miller1383bd82000-04-06 12:32:37 +10001861}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001862
Ben Lindstromf558cf62001-09-20 23:13:49 +00001863/* request pty/x11/agent/tcpfwd/shell for channel */
Ben Lindstrombba81212001-06-25 05:01:22 +00001864static void
Damien Millerd530f5f2010-05-21 14:57:10 +10001865ssh_session2_setup(int id, int success, void *arg)
Damien Miller1383bd82000-04-06 12:32:37 +10001866{
Damien Miller3756dce2004-06-18 01:17:29 +10001867 extern char **environ;
Damien Miller17e7ed02005-06-17 12:54:33 +10001868 const char *display;
Damien Miller0e220db2004-06-15 10:34:08 +10001869 int interactive = tty_flag;
djm@openbsd.orged4ce822016-01-13 23:04:47 +00001870 char *proto = NULL, *data = NULL;
Damien Miller17e7ed02005-06-17 12:54:33 +10001871
Damien Millerd530f5f2010-05-21 14:57:10 +10001872 if (!success)
1873 return; /* No need for error message, channels code sens one */
1874
Damien Miller46d38de2005-07-17 17:02:09 +10001875 display = getenv("DISPLAY");
djm@openbsd.orga58be332015-04-17 13:16:48 +00001876 if (display == NULL && options.forward_x11)
1877 debug("X11 forwarding requested but DISPLAY not set");
djm@openbsd.orged4ce822016-01-13 23:04:47 +00001878 if (options.forward_x11 && client_x11_get_proto(display,
1879 options.xauth_location, options.forward_x11_trusted,
1880 options.forward_x11_timeout, &proto, &data) == 0) {
Damien Millerbd483e72000-04-30 10:00:53 +10001881 /* Request forwarding with authentication spoofing. */
Darren Tuckerd6173c02008-06-13 04:52:53 +10001882 debug("Requesting X11 forwarding with authentication "
1883 "spoofing.");
Damien Miller6d7b4372011-06-23 08:31:57 +10001884 x11_request_forwarding_with_spoofing(id, display, proto,
1885 data, 1);
1886 client_expect_confirm(id, "X11 forwarding", CONFIRM_WARN);
1887 /* XXX exit_on_forward_failure */
Ben Lindstrombf555ba2001-01-18 02:04:35 +00001888 interactive = 1;
Damien Millerbd483e72000-04-30 10:00:53 +10001889 }
1890
Damien Miller0bc1bd82000-11-13 22:57:25 +11001891 check_agent_present();
1892 if (options.forward_agent) {
1893 debug("Requesting authentication agent forwarding.");
1894 channel_request_start(id, "auth-agent-req@openssh.com", 0);
1895 packet_send();
1896 }
1897
Darren Tucker7b305012012-07-02 18:55:09 +10001898 /* Tell the packet module whether this is an interactive session. */
1899 packet_set_interactive(interactive,
1900 options.ip_qos_interactive, options.ip_qos_bulk);
1901
Damien Miller0e220db2004-06-15 10:34:08 +10001902 client_session2_setup(id, tty_flag, subsystem_flag, getenv("TERM"),
Damien Miller5771ed72008-05-19 15:35:33 +10001903 NULL, fileno(stdin), &command, environ);
Damien Miller1383bd82000-04-06 12:32:37 +10001904}
1905
Ben Lindstromf558cf62001-09-20 23:13:49 +00001906/* open new channel for a session */
Ben Lindstrombba81212001-06-25 05:01:22 +00001907static int
Ben Lindstromf558cf62001-09-20 23:13:49 +00001908ssh_session2_open(void)
Damien Miller1383bd82000-04-06 12:32:37 +10001909{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001910 Channel *c;
1911 int window, packetmax, in, out, err;
Damien Millerad833b32000-08-23 10:46:23 +10001912
Damien Millercaf6dd62000-08-29 11:33:50 +11001913 if (stdin_null_flag) {
Ben Lindstrom31ca54a2001-02-09 02:11:24 +00001914 in = open(_PATH_DEVNULL, O_RDONLY);
Damien Millercaf6dd62000-08-29 11:33:50 +11001915 } else {
1916 in = dup(STDIN_FILENO);
1917 }
1918 out = dup(STDOUT_FILENO);
1919 err = dup(STDERR_FILENO);
1920
1921 if (in < 0 || out < 0 || err < 0)
1922 fatal("dup() in/out/err failed");
1923
Damien Miller69b69aa2000-10-28 14:19:58 +11001924 /* enable nonblocking unless tty */
1925 if (!isatty(in))
1926 set_nonblock(in);
1927 if (!isatty(out))
1928 set_nonblock(out);
1929 if (!isatty(err))
1930 set_nonblock(err);
1931
Damien Millere4340be2000-09-16 13:29:08 +11001932 window = CHAN_SES_WINDOW_DEFAULT;
1933 packetmax = CHAN_SES_PACKET_DEFAULT;
Damien Miller19a59452002-02-19 15:20:57 +11001934 if (tty_flag) {
1935 window >>= 1;
1936 packetmax >>= 1;
Damien Miller1383bd82000-04-06 12:32:37 +10001937 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001938 c = channel_new(
Damien Miller1383bd82000-04-06 12:32:37 +10001939 "session", SSH_CHANNEL_OPENING, in, out, err,
Damien Millere4340be2000-09-16 13:29:08 +11001940 window, packetmax, CHAN_EXTENDED_WRITE,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10001941 "client-session", /*nonblock*/0);
Damien Miller1383bd82000-04-06 12:32:37 +10001942
Ben Lindstromf558cf62001-09-20 23:13:49 +00001943 debug3("ssh_session2_open: channel_new: %d", c->self);
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001944
Ben Lindstrom5ec26452001-06-09 00:18:51 +00001945 channel_send_open(c->self);
Ben Lindstromf558cf62001-09-20 23:13:49 +00001946 if (!no_shell_flag)
Damien Millerb84886b2008-05-19 15:05:07 +10001947 channel_register_open_confirm(c->self,
1948 ssh_session2_setup, NULL);
Damien Miller1383bd82000-04-06 12:32:37 +10001949
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001950 return c->self;
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001951}
1952
Ben Lindstrombba81212001-06-25 05:01:22 +00001953static int
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001954ssh_session2(void)
1955{
Ben Lindstromf558cf62001-09-20 23:13:49 +00001956 int id = -1;
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001957
1958 /* XXX should be pre-session */
Darren Tucker2d6665d2011-11-04 10:54:22 +11001959 if (!options.control_persist)
1960 ssh_init_stdio_forwarding();
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001961 ssh_init_forwarding();
1962
Damien Millere11e1ea2010-08-03 16:04:46 +10001963 /* Start listening for multiplex clients */
markus@openbsd.org8d057842016-09-30 09:19:13 +00001964 if (!packet_get_mux())
1965 muxserver_listen();
Damien Millere11e1ea2010-08-03 16:04:46 +10001966
1967 /*
Darren Tucker2d6665d2011-11-04 10:54:22 +11001968 * If we are in control persist mode and have a working mux listen
1969 * socket, then prepare to background ourselves and have a foreground
1970 * client attach as a control slave.
1971 * NB. we must save copies of the flags that we override for
Damien Millere11e1ea2010-08-03 16:04:46 +10001972 * the backgrounding, since we defer attachment of the slave until
1973 * after the connection is fully established (in particular,
1974 * async rfwd replies have been received for ExitOnForwardFailure).
1975 */
1976 if (options.control_persist && muxserver_sock != -1) {
1977 ostdin_null_flag = stdin_null_flag;
1978 ono_shell_flag = no_shell_flag;
Damien Miller21771e22011-05-15 08:45:50 +10001979 orequest_tty = options.request_tty;
Damien Millere11e1ea2010-08-03 16:04:46 +10001980 otty_flag = tty_flag;
1981 stdin_null_flag = 1;
1982 no_shell_flag = 1;
Damien Millere11e1ea2010-08-03 16:04:46 +10001983 tty_flag = 0;
1984 if (!fork_after_authentication_flag)
1985 need_controlpersist_detach = 1;
1986 fork_after_authentication_flag = 1;
1987 }
Darren Tucker2d6665d2011-11-04 10:54:22 +11001988 /*
1989 * ControlPersist mux listen socket setup failed, attempt the
1990 * stdio forward setup that we skipped earlier.
1991 */
1992 if (options.control_persist && muxserver_sock == -1)
1993 ssh_init_stdio_forwarding();
Damien Millere11e1ea2010-08-03 16:04:46 +10001994
Ben Lindstromf558cf62001-09-20 23:13:49 +00001995 if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN))
1996 id = ssh_session2_open();
Damien Miller649fe022013-07-18 16:13:55 +10001997 else {
1998 packet_set_interactive(
1999 options.control_master == SSHCTL_MASTER_NO,
2000 options.ip_qos_interactive, options.ip_qos_bulk);
2001 }
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00002002
Darren Tucker8901fa92008-06-11 09:34:01 +10002003 /* If we don't expect to open a new session, then disallow it */
Damien Miller456e6f02008-11-03 19:20:10 +11002004 if (options.control_master == SSHCTL_MASTER_NO &&
2005 (datafellows & SSH_NEW_OPENSSH)) {
Darren Tucker8901fa92008-06-11 09:34:01 +10002006 debug("Requesting no-more-sessions@openssh.com");
2007 packet_start(SSH2_MSG_GLOBAL_REQUEST);
2008 packet_put_cstring("no-more-sessions@openssh.com");
2009 packet_put_char(0);
2010 packet_send();
2011 }
2012
Damien Millerd27b9472005-12-13 19:29:02 +11002013 /* Execute a local command */
2014 if (options.local_command != NULL &&
2015 options.permit_local_command)
2016 ssh_local_cmd(options.local_command);
2017
Damien Miller1f25ab42010-07-16 13:56:23 +10002018 /*
2019 * If requested and we are not interested in replies to remote
2020 * forwarding requests, then let ssh continue in the background.
2021 */
Damien Millere11e1ea2010-08-03 16:04:46 +10002022 if (fork_after_authentication_flag) {
2023 if (options.exit_on_forward_failure &&
2024 options.num_remote_forwards > 0) {
2025 debug("deferring postauth fork until remote forward "
2026 "confirmation received");
2027 } else
2028 fork_postauth();
Darren Tucker9a2a6092008-07-04 12:53:50 +10002029 }
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00002030
Ben Lindstrom2b1f71b2001-06-05 20:32:21 +00002031 return client_loop(tty_flag, tty_flag ?
2032 options.escape_char : SSH_ESCAPECHAR_NONE, id);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002033}
Damien Miller0bc1bd82000-11-13 22:57:25 +11002034
djm@openbsd.org4e44a792015-09-24 06:15:11 +00002035/* Loads all IdentityFile and CertificateFile keys */
Ben Lindstrombba81212001-06-25 05:01:22 +00002036static void
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00002037load_public_identity_files(void)
2038{
Damien Miller6b1d53c2006-03-31 23:13:21 +11002039 char *filename, *cp, thishost[NI_MAXHOST];
Darren Tuckerb4fbbc62007-12-02 23:16:32 +11002040 char *pwdir = NULL, *pwname = NULL;
Ben Lindstrom0936a5b2002-03-26 03:17:42 +00002041 Key *public;
Damien Miller6b1d53c2006-03-31 23:13:21 +11002042 struct passwd *pw;
djm@openbsd.org4e44a792015-09-24 06:15:11 +00002043 int i;
2044 u_int n_ids, n_certs;
Damien Miller0a80ca12010-02-27 07:55:05 +11002045 char *identity_files[SSH_MAX_IDENTITY_FILES];
2046 Key *identity_keys[SSH_MAX_IDENTITY_FILES];
djm@openbsd.org4e44a792015-09-24 06:15:11 +00002047 char *certificate_files[SSH_MAX_CERTIFICATE_FILES];
2048 struct sshkey *certificates[SSH_MAX_CERTIFICATE_FILES];
Damien Miller7ea845e2010-02-12 09:21:02 +11002049#ifdef ENABLE_PKCS11
Ben Lindstrom0936a5b2002-03-26 03:17:42 +00002050 Key **keys;
Damien Miller7ea845e2010-02-12 09:21:02 +11002051 int nkeys;
Damien Miller0a80ca12010-02-27 07:55:05 +11002052#endif /* PKCS11 */
Ben Lindstrom0936a5b2002-03-26 03:17:42 +00002053
djm@openbsd.org4e44a792015-09-24 06:15:11 +00002054 n_ids = n_certs = 0;
Damien Miller1d2c4562014-02-04 11:18:20 +11002055 memset(identity_files, 0, sizeof(identity_files));
2056 memset(identity_keys, 0, sizeof(identity_keys));
djm@openbsd.org4e44a792015-09-24 06:15:11 +00002057 memset(certificate_files, 0, sizeof(certificate_files));
2058 memset(certificates, 0, sizeof(certificates));
Damien Miller0a80ca12010-02-27 07:55:05 +11002059
2060#ifdef ENABLE_PKCS11
Damien Miller7ea845e2010-02-12 09:21:02 +11002061 if (options.pkcs11_provider != NULL &&
Ben Lindstrom0936a5b2002-03-26 03:17:42 +00002062 options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
Damien Miller7ea845e2010-02-12 09:21:02 +11002063 (pkcs11_init(!options.batch_mode) == 0) &&
2064 (nkeys = pkcs11_add_provider(options.pkcs11_provider, NULL,
2065 &keys)) > 0) {
Damien Miller7ea845e2010-02-12 09:21:02 +11002066 for (i = 0; i < nkeys; i++) {
Damien Miller0a80ca12010-02-27 07:55:05 +11002067 if (n_ids >= SSH_MAX_IDENTITY_FILES) {
2068 key_free(keys[i]);
2069 continue;
2070 }
2071 identity_keys[n_ids] = keys[i];
2072 identity_files[n_ids] =
Damien Miller7ea845e2010-02-12 09:21:02 +11002073 xstrdup(options.pkcs11_provider); /* XXX */
Damien Miller0a80ca12010-02-27 07:55:05 +11002074 n_ids++;
Ben Lindstrom0936a5b2002-03-26 03:17:42 +00002075 }
Darren Tuckera627d422013-06-02 07:31:17 +10002076 free(keys);
Ben Lindstrom711b04a2001-08-06 21:12:42 +00002077 }
Damien Miller7ea845e2010-02-12 09:21:02 +11002078#endif /* ENABLE_PKCS11 */
Damien Miller6b1d53c2006-03-31 23:13:21 +11002079 if ((pw = getpwuid(original_real_uid)) == NULL)
2080 fatal("load_public_identity_files: getpwuid failed");
Darren Tuckere143f062007-12-02 23:21:16 +11002081 pwname = xstrdup(pw->pw_name);
2082 pwdir = xstrdup(pw->pw_dir);
Damien Miller6b1d53c2006-03-31 23:13:21 +11002083 if (gethostname(thishost, sizeof(thishost)) == -1)
2084 fatal("load_public_identity_files: gethostname: %s",
2085 strerror(errno));
Damien Miller0a80ca12010-02-27 07:55:05 +11002086 for (i = 0; i < options.num_identity_files; i++) {
Darren Tucker15fd19c2013-04-05 11:22:26 +11002087 if (n_ids >= SSH_MAX_IDENTITY_FILES ||
2088 strcasecmp(options.identity_files[i], "none") == 0) {
Darren Tuckera627d422013-06-02 07:31:17 +10002089 free(options.identity_files[i]);
djm@openbsd.org4e44a792015-09-24 06:15:11 +00002090 options.identity_files[i] = NULL;
Damien Miller0a80ca12010-02-27 07:55:05 +11002091 continue;
2092 }
Damien Miller6b1d53c2006-03-31 23:13:21 +11002093 cp = tilde_expand_filename(options.identity_files[i],
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00002094 original_real_uid);
Darren Tuckerb4fbbc62007-12-02 23:16:32 +11002095 filename = percent_expand(cp, "d", pwdir,
2096 "u", pwname, "l", thishost, "h", host,
Damien Miller6b1d53c2006-03-31 23:13:21 +11002097 "r", options.user, (char *)NULL);
Darren Tuckera627d422013-06-02 07:31:17 +10002098 free(cp);
Ben Lindstromd0fca422001-03-26 13:44:06 +00002099 public = key_load_public(filename, NULL);
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00002100 debug("identity file %s type %d", filename,
2101 public ? public->type : -1);
Darren Tuckera627d422013-06-02 07:31:17 +10002102 free(options.identity_files[i]);
Damien Miller0a80ca12010-02-27 07:55:05 +11002103 identity_files[n_ids] = filename;
2104 identity_keys[n_ids] = public;
2105
2106 if (++n_ids >= SSH_MAX_IDENTITY_FILES)
2107 continue;
2108
djm@openbsd.org4e44a792015-09-24 06:15:11 +00002109 /*
2110 * If no certificates have been explicitly listed then try
2111 * to add the default certificate variant too.
2112 */
2113 if (options.num_certificate_files != 0)
2114 continue;
Damien Miller0a80ca12010-02-27 07:55:05 +11002115 xasprintf(&cp, "%s-cert", filename);
2116 public = key_load_public(cp, NULL);
2117 debug("identity file %s type %d", cp,
2118 public ? public->type : -1);
2119 if (public == NULL) {
Darren Tuckera627d422013-06-02 07:31:17 +10002120 free(cp);
Damien Miller0a80ca12010-02-27 07:55:05 +11002121 continue;
2122 }
2123 if (!key_is_cert(public)) {
2124 debug("%s: key %s type %s is not a certificate",
2125 __func__, cp, key_type(public));
2126 key_free(public);
Darren Tuckera627d422013-06-02 07:31:17 +10002127 free(cp);
Damien Miller0a80ca12010-02-27 07:55:05 +11002128 continue;
2129 }
djm@openbsd.orgb4867e02016-12-06 07:48:01 +00002130 /* NB. leave filename pointing to private key */
2131 identity_files[n_ids] = xstrdup(filename);
Damien Miller0a80ca12010-02-27 07:55:05 +11002132 identity_keys[n_ids] = public;
Damien Miller0a80ca12010-02-27 07:55:05 +11002133 n_ids++;
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00002134 }
djm@openbsd.org4e44a792015-09-24 06:15:11 +00002135
2136 if (options.num_certificate_files > SSH_MAX_CERTIFICATE_FILES)
2137 fatal("%s: too many certificates", __func__);
2138 for (i = 0; i < options.num_certificate_files; i++) {
2139 cp = tilde_expand_filename(options.certificate_files[i],
2140 original_real_uid);
2141 filename = percent_expand(cp, "d", pwdir,
2142 "u", pwname, "l", thishost, "h", host,
2143 "r", options.user, (char *)NULL);
2144 free(cp);
2145
2146 public = key_load_public(filename, NULL);
2147 debug("certificate file %s type %d", filename,
2148 public ? public->type : -1);
2149 free(options.certificate_files[i]);
2150 options.certificate_files[i] = NULL;
2151 if (public == NULL) {
2152 free(filename);
2153 continue;
2154 }
2155 if (!key_is_cert(public)) {
2156 debug("%s: key %s type %s is not a certificate",
2157 __func__, filename, key_type(public));
2158 key_free(public);
2159 free(filename);
2160 continue;
2161 }
2162 certificate_files[n_certs] = filename;
2163 certificates[n_certs] = public;
2164 ++n_certs;
2165 }
2166
Damien Miller0a80ca12010-02-27 07:55:05 +11002167 options.num_identity_files = n_ids;
2168 memcpy(options.identity_files, identity_files, sizeof(identity_files));
2169 memcpy(options.identity_keys, identity_keys, sizeof(identity_keys));
2170
djm@openbsd.org4e44a792015-09-24 06:15:11 +00002171 options.num_certificate_files = n_certs;
2172 memcpy(options.certificate_files,
2173 certificate_files, sizeof(certificate_files));
2174 memcpy(options.certificates, certificates, sizeof(certificates));
2175
Damien Miller1d2c4562014-02-04 11:18:20 +11002176 explicit_bzero(pwname, strlen(pwname));
Darren Tuckera627d422013-06-02 07:31:17 +10002177 free(pwname);
Damien Miller1d2c4562014-02-04 11:18:20 +11002178 explicit_bzero(pwdir, strlen(pwdir));
Darren Tuckera627d422013-06-02 07:31:17 +10002179 free(pwdir);
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00002180}
Damien Miller857b02e2010-09-24 22:02:56 +10002181
2182static void
2183main_sigchld_handler(int sig)
2184{
2185 int save_errno = errno;
2186 pid_t pid;
2187 int status;
2188
2189 while ((pid = waitpid(-1, &status, WNOHANG)) > 0 ||
2190 (pid < 0 && errno == EINTR))
2191 ;
2192
2193 signal(sig, main_sigchld_handler);
2194 errno = save_errno;
2195}