blob: f4204c88d93981e8cdc0905d5376192b5f89d98d [file] [log] [blame]
djm@openbsd.orgaa083aa2018-09-20 03:31:49 +00001/* $OpenBSD: ssh.c,v 1.492 2018/09/20 03:31:49 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"
Damien Miller1383bd82000-04-06 12:32:37 +100084#include "ssh2.h"
Damien Millerb96c4412010-07-02 13:34:24 +100085#include "canohost.h"
Damien Miller1383bd82000-04-06 12:32:37 +100086#include "compat.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000087#include "cipher.h"
Damien Miller9c386432014-07-03 21:27:46 +100088#include "digest.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000089#include "packet.h"
markus@openbsd.orgcecee2d2018-07-09 21:03:30 +000090#include "sshbuf.h"
Ben Lindstromc7637672001-06-09 00:36:26 +000091#include "channels.h"
markus@openbsd.org5467fbc2018-07-11 18:53:29 +000092#include "sshkey.h"
Damien Miller994cf142000-07-21 10:19:44 +100093#include "authfd.h"
Damien Millereba71ba2000-04-29 23:57:08 +100094#include "authfile.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000095#include "pathnames.h"
Damien Miller0e220db2004-06-15 10:34:08 +100096#include "dispatch.h"
Ben Lindstrombf555ba2001-01-18 02:04:35 +000097#include "clientloop.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000098#include "log.h"
Damien Miller7acefbb2014-07-18 14:11:24 +100099#include "misc.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +0000100#include "readconf.h"
101#include "sshconnect.h"
Ben Lindstrom06b33aa2001-02-15 03:01:59 +0000102#include "kex.h"
103#include "mac.h"
Darren Tucker06f2bd82004-05-13 16:06:46 +1000104#include "sshpty.h"
Darren Tucker46bc0752004-05-02 22:11:30 +1000105#include "match.h"
Damien Miller0e220db2004-06-15 10:34:08 +1000106#include "msg.h"
Damien Millerb7576772006-07-10 20:23:39 +1000107#include "version.h"
djm@openbsd.org141efe42015-01-14 20:05:27 +0000108#include "ssherr.h"
djm@openbsd.orgf9eca242015-07-30 00:01:34 +0000109#include "myproposal.h"
Damien Millerdda78a02016-12-12 13:57:10 +1100110#include "utf8.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000111
Damien Miller7ea845e2010-02-12 09:21:02 +1100112#ifdef ENABLE_PKCS11
113#include "ssh-pkcs11.h"
Ben Lindstrombcc18082001-08-06 21:59:25 +0000114#endif
Ben Lindstromc5b68002001-07-04 04:52:03 +0000115
Damien Miller3f905871999-11-15 17:10:57 +1100116extern char *__progname;
Damien Miller3f905871999-11-15 17:10:57 +1100117
Damien Millerea2c1a42011-06-03 12:10:22 +1000118/* Saves a copy of argv for setproctitle emulation */
119#ifndef HAVE_SETPROCTITLE
120static char **saved_av;
121#endif
122
Darren Tuckerd6173c02008-06-13 04:52:53 +1000123/* Flag indicating whether debug mode is on. May be set on the command line. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000124int debug_flag = 0;
125
Damien Miller21771e22011-05-15 08:45:50 +1000126/* Flag indicating whether a tty should be requested */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000127int tty_flag = 0;
128
Damien Miller1383bd82000-04-06 12:32:37 +1000129/* don't exec a shell */
130int no_shell_flag = 0;
Damien Miller1383bd82000-04-06 12:32:37 +1000131
Damien Miller5428f641999-11-25 11:54:57 +1100132/*
133 * Flag indicating that nothing should be read from stdin. This can be set
134 * on the command line.
135 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000136int stdin_null_flag = 0;
137
Damien Miller5428f641999-11-25 11:54:57 +1100138/*
Damien Millere11e1ea2010-08-03 16:04:46 +1000139 * Flag indicating that the current process should be backgrounded and
140 * a new slave launched in the foreground for ControlPersist.
141 */
142int need_controlpersist_detach = 0;
143
144/* Copies of flags for ControlPersist foreground slave */
Damien Miller21771e22011-05-15 08:45:50 +1000145int ostdin_null_flag, ono_shell_flag, otty_flag, orequest_tty;
Damien Millere11e1ea2010-08-03 16:04:46 +1000146
147/*
Damien Miller5428f641999-11-25 11:54:57 +1100148 * Flag indicating that ssh should fork after authentication. This is useful
Ben Lindstromf666fec2002-06-06 19:51:58 +0000149 * so that the passphrase can be entered manually, and then ssh goes to the
Damien Miller5428f641999-11-25 11:54:57 +1100150 * background.
151 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000152int fork_after_authentication_flag = 0;
153
Damien Miller5428f641999-11-25 11:54:57 +1100154/*
155 * General data structure for command line options and options configurable
156 * in configuration files. See readconf.h.
157 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000158Options options;
159
Ben Lindstrom14f31ab2001-09-12 17:48:04 +0000160/* optional user configfile */
161char *config = NULL;
162
Damien Miller5428f641999-11-25 11:54:57 +1100163/*
164 * Name of the host we are connecting to. This is the name given on the
165 * command line, or the HostName specified for the user-supplied name in a
166 * configuration file.
167 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000168char *host;
169
djm@openbsd.orgb7548b12017-10-23 05:08:00 +0000170/* Various strings used to to percent_expand() arguments */
171static char thishost[NI_MAXHOST], shorthost[NI_MAXHOST], portstr[NI_MAXSERV];
172static char uidstr[32], *host_arg, *conn_hash_hex;
173
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000174/* socket address the host resolves to */
Damien Miller34132e52000-01-14 15:45:46 +1100175struct sockaddr_storage hostaddr;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000176
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000177/* Private host keys. */
Ben Lindstrom1bad2562002-06-06 19:57:33 +0000178Sensitive sensitive_data;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000179
Damien Miller1383bd82000-04-06 12:32:37 +1000180/* command to be executed */
markus@openbsd.orgcecee2d2018-07-09 21:03:30 +0000181struct sshbuf *command;
Damien Miller1383bd82000-04-06 12:32:37 +1000182
Damien Miller832562e2001-01-30 09:30:01 +1100183/* Should we execute a command or invoke a subsystem? */
184int subsystem_flag = 0;
185
Damien Miller2797f7f2002-04-23 21:09:44 +1000186/* # of replies received for global requests */
Darren Tucker9f407c42008-06-13 04:50:27 +1000187static int remote_forward_confirms_received = 0;
Damien Miller2797f7f2002-04-23 21:09:44 +1000188
Damien Millerb1cbfa22008-05-19 16:00:08 +1000189/* mux.c */
190extern int muxserver_sock;
191extern u_int muxclient_command;
Damien Miller0e220db2004-06-15 10:34:08 +1000192
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000193/* Prints a help message to the user. This function never returns. */
194
Ben Lindstrombba81212001-06-25 05:01:22 +0000195static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000196usage(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000197{
Damien Miller50955102004-03-22 09:34:58 +1100198 fprintf(stderr,
djm@openbsd.orgac2e3022018-02-23 02:34:33 +0000199"usage: ssh [-46AaCfGgKkMNnqsTtVvXxYy] [-B bind_interface]\n"
200" [-b bind_address] [-c cipher_spec] [-D [bind_address:]port]\n"
201" [-E log_file] [-e escape_char] [-F configfile] [-I pkcs11]\n"
202" [-i identity_file] [-J [user@]host[:port]] [-L address]\n"
203" [-l login_name] [-m mac_spec] [-O ctl_cmd] [-o option] [-p port]\n"
204" [-Q query_option] [-R address] [-S ctl_path] [-W host:port]\n"
205" [-w local_tun[:remote_tun]] destination [command]\n"
Damien Miller50955102004-03-22 09:34:58 +1100206 );
Darren Tuckere9a9b712005-12-20 16:15:51 +1100207 exit(255);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000208}
209
djm@openbsd.orgb7548b12017-10-23 05:08:00 +0000210static int ssh_session2(struct ssh *, struct passwd *);
211static void load_public_identity_files(struct passwd *);
Damien Miller857b02e2010-09-24 22:02:56 +1000212static void main_sigchld_handler(int);
Damien Millerb1cbfa22008-05-19 16:00:08 +1000213
Damien Miller295ee632011-05-29 21:42:31 +1000214/* ~/ expand a list of paths. NB. assumes path[n] is heap-allocated. */
215static void
216tilde_expand_paths(char **paths, u_int num_paths)
217{
218 u_int i;
219 char *cp;
220
221 for (i = 0; i < num_paths; i++) {
dtucker@openbsd.orge655ee02018-07-27 05:34:42 +0000222 cp = tilde_expand_filename(paths[i], getuid());
Darren Tuckera627d422013-06-02 07:31:17 +1000223 free(paths[i]);
Damien Miller295ee632011-05-29 21:42:31 +1000224 paths[i] = cp;
225 }
226}
227
Damien Miller13f97b22014-02-24 15:57:55 +1100228/*
229 * Attempt to resolve a host name / port to a set of addresses and
230 * optionally return any CNAMEs encountered along the way.
231 * Returns NULL on failure.
232 * NB. this function must operate with a options having undefined members.
233 */
Damien Miller0faf7472013-10-17 11:47:23 +1100234static struct addrinfo *
Damien Miller13f97b22014-02-24 15:57:55 +1100235resolve_host(const char *name, int port, int logerr, char *cname, size_t clen)
Damien Miller0faf7472013-10-17 11:47:23 +1100236{
237 char strport[NI_MAXSERV];
238 struct addrinfo hints, *res;
239 int gaierr, loglevel = SYSLOG_LEVEL_DEBUG1;
240
Damien Miller13f97b22014-02-24 15:57:55 +1100241 if (port <= 0)
242 port = default_ssh_port();
243
djm@openbsd.orgb1d38a32015-10-15 23:51:40 +0000244 snprintf(strport, sizeof strport, "%d", port);
Damien Miller1d2c4562014-02-04 11:18:20 +1100245 memset(&hints, 0, sizeof(hints));
Damien Miller13f97b22014-02-24 15:57:55 +1100246 hints.ai_family = options.address_family == -1 ?
247 AF_UNSPEC : options.address_family;
Damien Miller0faf7472013-10-17 11:47:23 +1100248 hints.ai_socktype = SOCK_STREAM;
249 if (cname != NULL)
250 hints.ai_flags = AI_CANONNAME;
251 if ((gaierr = getaddrinfo(name, strport, &hints, &res)) != 0) {
252 if (logerr || (gaierr != EAI_NONAME && gaierr != EAI_NODATA))
253 loglevel = SYSLOG_LEVEL_ERROR;
254 do_log2(loglevel, "%s: Could not resolve hostname %.100s: %s",
255 __progname, name, ssh_gai_strerror(gaierr));
256 return NULL;
257 }
258 if (cname != NULL && res->ai_canonname != NULL) {
259 if (strlcpy(cname, res->ai_canonname, clen) >= clen) {
260 error("%s: host \"%s\" cname \"%s\" too long (max %lu)",
261 __func__, name, res->ai_canonname, (u_long)clen);
262 if (clen > 0)
263 *cname = '\0';
264 }
265 }
266 return res;
267}
268
djm@openbsd.orgfc21ea92018-01-23 05:06:25 +0000269/* Returns non-zero if name can only be an address and not a hostname */
270static int
271is_addr_fast(const char *name)
272{
273 return (strchr(name, '%') != NULL || strchr(name, ':') != NULL ||
274 strspn(name, "0123456789.") == strlen(name));
275}
276
277/* Returns non-zero if name represents a valid, single address */
278static int
279is_addr(const char *name)
280{
281 char strport[NI_MAXSERV];
282 struct addrinfo hints, *res;
283
284 if (is_addr_fast(name))
285 return 1;
286
287 snprintf(strport, sizeof strport, "%u", default_ssh_port());
288 memset(&hints, 0, sizeof(hints));
289 hints.ai_family = options.address_family == -1 ?
290 AF_UNSPEC : options.address_family;
291 hints.ai_socktype = SOCK_STREAM;
292 hints.ai_flags = AI_NUMERICHOST|AI_NUMERICSERV;
293 if (getaddrinfo(name, strport, &hints, &res) != 0)
294 return 0;
295 if (res == NULL || res->ai_next != NULL) {
296 freeaddrinfo(res);
297 return 0;
298 }
299 freeaddrinfo(res);
300 return 1;
301}
302
Damien Miller0faf7472013-10-17 11:47:23 +1100303/*
djm@openbsd.org90109022015-01-16 07:19:48 +0000304 * Attempt to resolve a numeric host address / port to a single address.
305 * Returns a canonical address string.
306 * Returns NULL on failure.
307 * NB. this function must operate with a options having undefined members.
308 */
309static struct addrinfo *
310resolve_addr(const char *name, int port, char *caddr, size_t clen)
311{
312 char addr[NI_MAXHOST], strport[NI_MAXSERV];
313 struct addrinfo hints, *res;
314 int gaierr;
315
316 if (port <= 0)
317 port = default_ssh_port();
318 snprintf(strport, sizeof strport, "%u", port);
319 memset(&hints, 0, sizeof(hints));
320 hints.ai_family = options.address_family == -1 ?
321 AF_UNSPEC : options.address_family;
322 hints.ai_socktype = SOCK_STREAM;
323 hints.ai_flags = AI_NUMERICHOST|AI_NUMERICSERV;
324 if ((gaierr = getaddrinfo(name, strport, &hints, &res)) != 0) {
325 debug2("%s: could not resolve name %.100s as address: %s",
326 __func__, name, ssh_gai_strerror(gaierr));
327 return NULL;
328 }
329 if (res == NULL) {
330 debug("%s: getaddrinfo %.100s returned no addresses",
331 __func__, name);
332 return NULL;
333 }
334 if (res->ai_next != NULL) {
335 debug("%s: getaddrinfo %.100s returned multiple addresses",
336 __func__, name);
337 goto fail;
338 }
339 if ((gaierr = getnameinfo(res->ai_addr, res->ai_addrlen,
340 addr, sizeof(addr), NULL, 0, NI_NUMERICHOST)) != 0) {
341 debug("%s: Could not format address for name %.100s: %s",
342 __func__, name, ssh_gai_strerror(gaierr));
343 goto fail;
344 }
345 if (strlcpy(caddr, addr, clen) >= clen) {
346 error("%s: host \"%s\" addr \"%s\" too long (max %lu)",
347 __func__, name, addr, (u_long)clen);
348 if (clen > 0)
349 *caddr = '\0';
350 fail:
351 freeaddrinfo(res);
352 return NULL;
353 }
354 return res;
355}
356
357/*
Damien Miller0faf7472013-10-17 11:47:23 +1100358 * Check whether the cname is a permitted replacement for the hostname
359 * and perform the replacement if it is.
Damien Miller13f97b22014-02-24 15:57:55 +1100360 * NB. this function must operate with a options having undefined members.
Damien Miller0faf7472013-10-17 11:47:23 +1100361 */
362static int
djm@openbsd.orged877ef2016-07-15 00:24:30 +0000363check_follow_cname(int direct, char **namep, const char *cname)
Damien Miller0faf7472013-10-17 11:47:23 +1100364{
365 int i;
366 struct allowed_cname *rule;
367
368 if (*cname == '\0' || options.num_permitted_cnames == 0 ||
369 strcmp(*namep, cname) == 0)
370 return 0;
Damien Miller38505592013-10-17 11:48:13 +1100371 if (options.canonicalize_hostname == SSH_CANONICALISE_NO)
Damien Miller0faf7472013-10-17 11:47:23 +1100372 return 0;
373 /*
Damien Miller38505592013-10-17 11:48:13 +1100374 * Don't attempt to canonicalize names that will be interpreted by
djm@openbsd.orged877ef2016-07-15 00:24:30 +0000375 * a proxy or jump host unless the user specifically requests so.
Damien Miller0faf7472013-10-17 11:47:23 +1100376 */
djm@openbsd.orged877ef2016-07-15 00:24:30 +0000377 if (!direct &&
Damien Miller38505592013-10-17 11:48:13 +1100378 options.canonicalize_hostname != SSH_CANONICALISE_ALWAYS)
Damien Miller0faf7472013-10-17 11:47:23 +1100379 return 0;
380 debug3("%s: check \"%s\" CNAME \"%s\"", __func__, *namep, cname);
381 for (i = 0; i < options.num_permitted_cnames; i++) {
382 rule = options.permitted_cnames + i;
djm@openbsd.orge661a862015-05-04 06:10:48 +0000383 if (match_pattern_list(*namep, rule->source_list, 1) != 1 ||
384 match_pattern_list(cname, rule->target_list, 1) != 1)
Damien Miller0faf7472013-10-17 11:47:23 +1100385 continue;
Damien Miller38505592013-10-17 11:48:13 +1100386 verbose("Canonicalized DNS aliased hostname "
Damien Miller0faf7472013-10-17 11:47:23 +1100387 "\"%s\" => \"%s\"", *namep, cname);
388 free(*namep);
389 *namep = xstrdup(cname);
390 return 1;
391 }
392 return 0;
393}
394
395/*
396 * Attempt to resolve the supplied hostname after applying the user's
Damien Miller51682fa2013-10-17 11:48:31 +1100397 * canonicalization rules. Returns the address list for the host or NULL
398 * if no name was found after canonicalization.
Damien Miller13f97b22014-02-24 15:57:55 +1100399 * NB. this function must operate with a options having undefined members.
Damien Miller0faf7472013-10-17 11:47:23 +1100400 */
401static struct addrinfo *
Damien Miller13f97b22014-02-24 15:57:55 +1100402resolve_canonicalize(char **hostp, int port)
Damien Miller0faf7472013-10-17 11:47:23 +1100403{
djm@openbsd.orged877ef2016-07-15 00:24:30 +0000404 int i, direct, ndots;
djm@openbsd.org90109022015-01-16 07:19:48 +0000405 char *cp, *fullhost, newname[NI_MAXHOST];
Damien Miller0faf7472013-10-17 11:47:23 +1100406 struct addrinfo *addrs;
407
djm@openbsd.orgfc21ea92018-01-23 05:06:25 +0000408 /*
409 * Attempt to canonicalise addresses, regardless of
410 * whether hostname canonicalisation was requested
411 */
412 if ((addrs = resolve_addr(*hostp, port,
413 newname, sizeof(newname))) != NULL) {
414 debug2("%s: hostname %.100s is address", __func__, *hostp);
415 if (strcasecmp(*hostp, newname) != 0) {
416 debug2("%s: canonicalised address \"%s\" => \"%s\"",
417 __func__, *hostp, newname);
418 free(*hostp);
419 *hostp = xstrdup(newname);
420 }
421 return addrs;
422 }
423
424 /*
425 * If this looks like an address but didn't parse as one, it might
426 * be an address with an invalid interface scope. Skip further
427 * attempts at canonicalisation.
428 */
429 if (is_addr_fast(*hostp)) {
430 debug("%s: hostname %.100s is an unrecognised address",
431 __func__, *hostp);
432 return NULL;
433 }
434
Damien Miller38505592013-10-17 11:48:13 +1100435 if (options.canonicalize_hostname == SSH_CANONICALISE_NO)
Damien Miller0faf7472013-10-17 11:47:23 +1100436 return NULL;
Damien Miller13f97b22014-02-24 15:57:55 +1100437
Damien Miller0faf7472013-10-17 11:47:23 +1100438 /*
Damien Miller38505592013-10-17 11:48:13 +1100439 * Don't attempt to canonicalize names that will be interpreted by
Damien Miller0faf7472013-10-17 11:47:23 +1100440 * a proxy unless the user specifically requests so.
441 */
djm@openbsd.orged877ef2016-07-15 00:24:30 +0000442 direct = option_clear_or_none(options.proxy_command) &&
443 options.jump_host == NULL;
444 if (!direct &&
Damien Miller38505592013-10-17 11:48:13 +1100445 options.canonicalize_hostname != SSH_CANONICALISE_ALWAYS)
Damien Miller0faf7472013-10-17 11:47:23 +1100446 return NULL;
Damien Miller13f97b22014-02-24 15:57:55 +1100447
djm@openbsd.org5ee00632015-10-16 18:40:49 +0000448 /* If domain name is anchored, then resolve it now */
449 if ((*hostp)[strlen(*hostp) - 1] == '.') {
450 debug3("%s: name is fully qualified", __func__);
451 fullhost = xstrdup(*hostp);
452 if ((addrs = resolve_host(fullhost, port, 0,
453 newname, sizeof(newname))) != NULL)
454 goto found;
455 free(fullhost);
456 goto notfound;
457 }
458
Damien Miller51682fa2013-10-17 11:48:31 +1100459 /* Don't apply canonicalization to sufficiently-qualified hostnames */
Damien Miller0faf7472013-10-17 11:47:23 +1100460 ndots = 0;
461 for (cp = *hostp; *cp != '\0'; cp++) {
462 if (*cp == '.')
463 ndots++;
464 }
Damien Miller38505592013-10-17 11:48:13 +1100465 if (ndots > options.canonicalize_max_dots) {
466 debug3("%s: not canonicalizing hostname \"%s\" (max dots %d)",
467 __func__, *hostp, options.canonicalize_max_dots);
Damien Miller0faf7472013-10-17 11:47:23 +1100468 return NULL;
469 }
470 /* Attempt each supplied suffix */
471 for (i = 0; i < options.num_canonical_domains; i++) {
djm@openbsd.org90109022015-01-16 07:19:48 +0000472 *newname = '\0';
Damien Miller0faf7472013-10-17 11:47:23 +1100473 xasprintf(&fullhost, "%s.%s.", *hostp,
474 options.canonical_domains[i]);
Damien Miller13f97b22014-02-24 15:57:55 +1100475 debug3("%s: attempting \"%s\" => \"%s\"", __func__,
476 *hostp, fullhost);
477 if ((addrs = resolve_host(fullhost, port, 0,
djm@openbsd.org90109022015-01-16 07:19:48 +0000478 newname, sizeof(newname))) == NULL) {
Damien Miller0faf7472013-10-17 11:47:23 +1100479 free(fullhost);
480 continue;
481 }
djm@openbsd.org5ee00632015-10-16 18:40:49 +0000482 found:
Damien Miller0faf7472013-10-17 11:47:23 +1100483 /* Remove trailing '.' */
484 fullhost[strlen(fullhost) - 1] = '\0';
485 /* Follow CNAME if requested */
djm@openbsd.orged877ef2016-07-15 00:24:30 +0000486 if (!check_follow_cname(direct, &fullhost, newname)) {
Damien Miller38505592013-10-17 11:48:13 +1100487 debug("Canonicalized hostname \"%s\" => \"%s\"",
Damien Miller0faf7472013-10-17 11:47:23 +1100488 *hostp, fullhost);
489 }
490 free(*hostp);
491 *hostp = fullhost;
492 return addrs;
493 }
djm@openbsd.org5ee00632015-10-16 18:40:49 +0000494 notfound:
Damien Miller38505592013-10-17 11:48:13 +1100495 if (!options.canonicalize_fallback_local)
Damien Miller13f97b22014-02-24 15:57:55 +1100496 fatal("%s: Could not resolve host \"%s\"", __progname, *hostp);
497 debug2("%s: host %s not found in any suffix", __func__, *hostp);
Damien Miller0faf7472013-10-17 11:47:23 +1100498 return NULL;
499}
500
Damien Miller95def091999-11-25 00:26:21 +1100501/*
markus@openbsd.org5467fbc2018-07-11 18:53:29 +0000502 * Check the result of hostkey loading, ignoring some errors and
503 * fatal()ing for others.
504 */
505static void
506check_load(int r, const char *path, const char *message)
507{
508 switch (r) {
509 case 0:
510 break;
511 case SSH_ERR_INTERNAL_ERROR:
512 case SSH_ERR_ALLOC_FAIL:
513 fatal("load %s \"%s\": %s", message, path, ssh_err(r));
514 case SSH_ERR_SYSTEM_ERROR:
515 /* Ignore missing files */
516 if (errno == ENOENT)
517 break;
518 /* FALLTHROUGH */
519 default:
520 error("load %s \"%s\": %s", message, path, ssh_err(r));
521 break;
522 }
523}
524
525/*
Damien Miller13f97b22014-02-24 15:57:55 +1100526 * Read per-user configuration file. Ignore the system wide config
527 * file if the user specifies a config file on the command line.
528 */
529static void
djm@openbsd.orgb7548b12017-10-23 05:08:00 +0000530process_config_files(const char *host_name, struct passwd *pw, int post_canon)
Damien Miller13f97b22014-02-24 15:57:55 +1100531{
deraadt@openbsd.org087266e2015-01-20 23:14:00 +0000532 char buf[PATH_MAX];
Damien Miller13f97b22014-02-24 15:57:55 +1100533 int r;
534
535 if (config != NULL) {
536 if (strcasecmp(config, "none") != 0 &&
djm@openbsd.orgb7548b12017-10-23 05:08:00 +0000537 !read_config_file(config, pw, host, host_name, &options,
djm@openbsd.org957fbce2014-10-08 22:20:25 +0000538 SSHCONF_USERCONF | (post_canon ? SSHCONF_POSTCANON : 0)))
Damien Miller13f97b22014-02-24 15:57:55 +1100539 fatal("Can't open user config file %.100s: "
540 "%.100s", config, strerror(errno));
541 } else {
542 r = snprintf(buf, sizeof buf, "%s/%s", pw->pw_dir,
543 _PATH_SSH_USER_CONFFILE);
544 if (r > 0 && (size_t)r < sizeof(buf))
djm@openbsd.orgb7548b12017-10-23 05:08:00 +0000545 (void)read_config_file(buf, pw, host, host_name,
djm@openbsd.org957fbce2014-10-08 22:20:25 +0000546 &options, SSHCONF_CHECKPERM | SSHCONF_USERCONF |
547 (post_canon ? SSHCONF_POSTCANON : 0));
Damien Miller13f97b22014-02-24 15:57:55 +1100548
549 /* Read systemwide configuration file after user config. */
djm@openbsd.org957fbce2014-10-08 22:20:25 +0000550 (void)read_config_file(_PATH_HOST_CONFIG_FILE, pw,
djm@openbsd.orgb7548b12017-10-23 05:08:00 +0000551 host, host_name, &options,
djm@openbsd.org957fbce2014-10-08 22:20:25 +0000552 post_canon ? SSHCONF_POSTCANON : 0);
553 }
554}
555
556/* Rewrite the port number in an addrinfo list of addresses */
557static void
558set_addrinfo_port(struct addrinfo *addrs, int port)
559{
560 struct addrinfo *addr;
561
562 for (addr = addrs; addr != NULL; addr = addr->ai_next) {
563 switch (addr->ai_family) {
564 case AF_INET:
565 ((struct sockaddr_in *)addr->ai_addr)->
566 sin_port = htons(port);
567 break;
568 case AF_INET6:
569 ((struct sockaddr_in6 *)addr->ai_addr)->
570 sin6_port = htons(port);
571 break;
572 }
Damien Miller13f97b22014-02-24 15:57:55 +1100573 }
574}
575
576/*
Damien Miller95def091999-11-25 00:26:21 +1100577 * Main program for the ssh client.
578 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000579int
580main(int ac, char **av)
581{
djm@openbsd.org95767262016-03-07 19:02:43 +0000582 struct ssh *ssh = NULL;
djm@openbsd.org643c2ad2017-08-12 06:46:01 +0000583 int i, r, opt, exit_status, use_syslog, direct, timeout_ms;
djm@openbsd.orgfc21ea92018-01-23 05:06:25 +0000584 int was_addr, config_test = 0, opt_terminated = 0;
djm@openbsd.orgb7548b12017-10-23 05:08:00 +0000585 char *p, *cp, *line, *argv0, buf[PATH_MAX], *logfile;
586 char cname[NI_MAXHOST];
Damien Miller95def091999-11-25 00:26:21 +1100587 struct stat st;
Ben Lindstrom086cf212001-03-05 05:56:40 +0000588 struct passwd *pw;
Ben Lindstrom5ccf63a2001-09-24 20:00:10 +0000589 extern int optind, optreset;
Damien Miller4f8e6692001-07-14 13:22:53 +1000590 extern char *optarg;
Damien Miller7acefbb2014-07-18 14:11:24 +1000591 struct Forward fwd;
Damien Miller0faf7472013-10-17 11:47:23 +1100592 struct addrinfo *addrs = NULL;
Damien Miller9c386432014-07-03 21:27:46 +1000593 struct ssh_digest_ctx *md;
594 u_char conn_hash[SSH_DIGEST_MAX_LENGTH];
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000595
dtucker@openbsd.orgffb1e7e2016-02-15 09:47:49 +0000596 ssh_malloc_init(); /* must be called before any mallocs */
Darren Tuckerce321d82005-10-03 18:11:24 +1000597 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
598 sanitise_stdfd();
599
Damien Miller59d3d5b2003-08-22 09:34:41 +1000600 __progname = ssh_get_progname(av[0]);
Damien Millerf9b625c2000-07-09 22:42:32 +1000601
Damien Millerea2c1a42011-06-03 12:10:22 +1000602#ifndef HAVE_SETPROCTITLE
603 /* Prepare for later setproctitle emulation */
604 /* Save argv so it isn't clobbered by setproctitle() emulation */
605 saved_av = xcalloc(ac + 1, sizeof(*saved_av));
606 for (i = 0; i < ac; i++)
607 saved_av[i] = xstrdup(av[i]);
608 saved_av[i] = NULL;
609 compat_init_setproctitle(ac, av);
610 av = saved_av;
611#endif
612
Damien Miller5428f641999-11-25 11:54:57 +1100613 /*
Damien Miller00d9ae22010-08-17 01:59:31 +1000614 * Discard other fds that are hanging around. These can cause problem
615 * with backgrounded ssh processes started by ControlPersist.
616 */
617 closefrom(STDERR_FILENO + 1);
618
Ben Lindstrom3fcf1a22001-04-08 18:26:59 +0000619 /* Get user data. */
dtucker@openbsd.orge655ee02018-07-27 05:34:42 +0000620 pw = getpwuid(getuid());
Ben Lindstrom3fcf1a22001-04-08 18:26:59 +0000621 if (!pw) {
dtucker@openbsd.orge655ee02018-07-27 05:34:42 +0000622 logit("No user exists for uid %lu", (u_long)getuid());
Darren Tuckere9a9b712005-12-20 16:15:51 +1100623 exit(255);
Ben Lindstrom3fcf1a22001-04-08 18:26:59 +0000624 }
625 /* Take a copy of the returned structure. */
626 pw = pwcopy(pw);
627
Damien Miller5428f641999-11-25 11:54:57 +1100628 /*
Damien Miller5428f641999-11-25 11:54:57 +1100629 * Set our umask to something reasonable, as some files are created
630 * with the default umask. This will make them world-readable but
631 * writable only by the owner, which is ok for all files for which we
632 * don't set the modes explicitly.
633 */
Damien Miller95def091999-11-25 00:26:21 +1100634 umask(022);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000635
Damien Millerdda78a02016-12-12 13:57:10 +1100636 msetlocale();
djm@openbsd.org65c6c6b2016-07-17 04:20:16 +0000637
Darren Tuckerd6173c02008-06-13 04:52:53 +1000638 /*
639 * Initialize option structure to indicate that no values have been
640 * set.
641 */
Damien Miller95def091999-11-25 00:26:21 +1100642 initialize_options(&options);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000643
djm@openbsd.orgdbee4112017-09-12 06:32:07 +0000644 /*
645 * Prepare main ssh transport/connection structures
646 */
647 if ((ssh = ssh_alloc_session_state()) == NULL)
648 fatal("Couldn't allocate session state");
649 channel_init_channels(ssh);
650 active_state = ssh; /* XXX legacy API compat */
651
Damien Miller95def091999-11-25 00:26:21 +1100652 /* Parse command-line arguments. */
653 host = NULL;
Damien Millere272a5b2008-11-03 19:22:37 +1100654 use_syslog = 0;
Damien Miller03d4d7e2013-04-23 15:21:06 +1000655 logfile = NULL;
Darren Tucker72efd742009-06-21 17:48:00 +1000656 argv0 = av[0];
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000657
Damien Miller2ecb6bd2006-03-15 12:03:53 +1100658 again:
Darren Tuckerd6173c02008-06-13 04:52:53 +1000659 while ((opt = getopt(ac, av, "1246ab:c:e:fgi:kl:m:no:p:qstvx"
djm@openbsd.orgac2e3022018-02-23 02:34:33 +0000660 "AB:CD:E:F:GI:J:KL:MNO:PQ:R:S:TVw:W:XYy")) != -1) {
Damien Miller95def091999-11-25 00:26:21 +1100661 switch (opt) {
Ben Lindstrom1e7d3062001-02-09 02:36:43 +0000662 case '1':
djm@openbsd.org99f95ba2017-04-30 23:11:45 +0000663 fatal("SSH protocol v.1 is no longer supported");
Ben Lindstrom1e7d3062001-02-09 02:36:43 +0000664 break;
Damien Miller4af51302000-04-16 11:18:38 +1000665 case '2':
djm@openbsd.org99f95ba2017-04-30 23:11:45 +0000666 /* Ignored */
Damien Miller4af51302000-04-16 11:18:38 +1000667 break;
Damien Miller34132e52000-01-14 15:45:46 +1100668 case '4':
Darren Tucker0a4f04b2003-07-03 20:37:47 +1000669 options.address_family = AF_INET;
Damien Miller34132e52000-01-14 15:45:46 +1100670 break;
Damien Miller34132e52000-01-14 15:45:46 +1100671 case '6':
Darren Tucker0a4f04b2003-07-03 20:37:47 +1000672 options.address_family = AF_INET6;
Damien Miller34132e52000-01-14 15:45:46 +1100673 break;
Damien Miller95def091999-11-25 00:26:21 +1100674 case 'n':
675 stdin_null_flag = 1;
676 break;
Damien Miller95def091999-11-25 00:26:21 +1100677 case 'f':
678 fork_after_authentication_flag = 1;
679 stdin_null_flag = 1;
680 break;
Damien Miller95def091999-11-25 00:26:21 +1100681 case 'x':
682 options.forward_x11 = 0;
683 break;
Damien Miller95def091999-11-25 00:26:21 +1100684 case 'X':
685 options.forward_x11 = 1;
686 break;
Damien Millere272a5b2008-11-03 19:22:37 +1100687 case 'y':
688 use_syslog = 1;
689 break;
Damien Miller03d4d7e2013-04-23 15:21:06 +1000690 case 'E':
dtucker@openbsd.org4f7cc2f2015-09-04 08:21:47 +0000691 logfile = optarg;
Damien Miller03d4d7e2013-04-23 15:21:06 +1000692 break;
djm@openbsd.org957fbce2014-10-08 22:20:25 +0000693 case 'G':
694 config_test = 1;
695 break;
Darren Tucker0a118da2003-10-15 15:54:32 +1000696 case 'Y':
697 options.forward_x11 = 1;
698 options.forward_x11_trusted = 1;
699 break;
Damien Miller95def091999-11-25 00:26:21 +1100700 case 'g':
Damien Miller7acefbb2014-07-18 14:11:24 +1000701 options.fwd_opts.gateway_ports = 1;
Damien Miller95def091999-11-25 00:26:21 +1100702 break;
Darren Tucker7ebfc102004-11-07 20:06:19 +1100703 case 'O':
dtucker@openbsd.org8543ff32016-06-03 03:14:41 +0000704 if (options.stdio_forward_host != NULL)
Damien Millere1537f92010-01-26 13:26:22 +1100705 fatal("Cannot specify multiplexing "
706 "command with -W");
707 else if (muxclient_command != 0)
708 fatal("Multiplexing command already specified");
Darren Tucker7ebfc102004-11-07 20:06:19 +1100709 if (strcmp(optarg, "check") == 0)
Damien Millerb1cbfa22008-05-19 16:00:08 +1000710 muxclient_command = SSHMUX_COMMAND_ALIVE_CHECK;
Damien Miller388f6fc2010-05-21 14:57:35 +1000711 else if (strcmp(optarg, "forward") == 0)
712 muxclient_command = SSHMUX_COMMAND_FORWARD;
Darren Tucker7ebfc102004-11-07 20:06:19 +1100713 else if (strcmp(optarg, "exit") == 0)
Damien Millerb1cbfa22008-05-19 16:00:08 +1000714 muxclient_command = SSHMUX_COMMAND_TERMINATE;
Damien Miller6c3eec72011-05-05 14:16:22 +1000715 else if (strcmp(optarg, "stop") == 0)
716 muxclient_command = SSHMUX_COMMAND_STOP;
Damien Millerf6dff7c2011-09-22 21:38:52 +1000717 else if (strcmp(optarg, "cancel") == 0)
718 muxclient_command = SSHMUX_COMMAND_CANCEL_FWD;
markus@openbsd.org8d057842016-09-30 09:19:13 +0000719 else if (strcmp(optarg, "proxy") == 0)
720 muxclient_command = SSHMUX_COMMAND_PROXY;
Darren Tucker7ebfc102004-11-07 20:06:19 +1100721 else
722 fatal("Invalid multiplex command.");
723 break;
Damien Miller147bba32002-09-04 16:46:06 +1000724 case 'P': /* deprecated */
Damien Miller95def091999-11-25 00:26:21 +1100725 break;
Damien Millerd937dc02013-12-05 10:19:54 +1100726 case 'Q':
Damien Millerea111192013-04-23 19:24:32 +1000727 cp = NULL;
Damien Millerd937dc02013-12-05 10:19:54 +1100728 if (strcmp(optarg, "cipher") == 0)
Damien Miller0fde8ac2013-11-21 14:12:23 +1100729 cp = cipher_alg_list('\n', 0);
Damien Millerd937dc02013-12-05 10:19:54 +1100730 else if (strcmp(optarg, "cipher-auth") == 0)
Damien Miller0fde8ac2013-11-21 14:12:23 +1100731 cp = cipher_alg_list('\n', 1);
Damien Millerd937dc02013-12-05 10:19:54 +1100732 else if (strcmp(optarg, "mac") == 0)
Damien Miller690d9892013-11-08 12:16:49 +1100733 cp = mac_alg_list('\n');
Damien Millerd937dc02013-12-05 10:19:54 +1100734 else if (strcmp(optarg, "kex") == 0)
Damien Miller690d9892013-11-08 12:16:49 +1100735 cp = kex_alg_list('\n');
Damien Millerd937dc02013-12-05 10:19:54 +1100736 else if (strcmp(optarg, "key") == 0)
djm@openbsd.org183ba552017-03-10 04:07:20 +0000737 cp = sshkey_alg_list(0, 0, 0, '\n');
Damien Miller5be9d9e2013-12-07 11:24:01 +1100738 else if (strcmp(optarg, "key-cert") == 0)
djm@openbsd.org183ba552017-03-10 04:07:20 +0000739 cp = sshkey_alg_list(1, 0, 0, '\n');
Damien Miller5be9d9e2013-12-07 11:24:01 +1100740 else if (strcmp(optarg, "key-plain") == 0)
djm@openbsd.org183ba552017-03-10 04:07:20 +0000741 cp = sshkey_alg_list(0, 1, 0, '\n');
djm@openbsd.org357128a2018-09-12 01:30:10 +0000742 else if (strcmp(optarg, "sig") == 0)
djm@openbsd.orgaa083aa2018-09-20 03:31:49 +0000743 cp = sshkey_alg_list(0, 1, 1, '\n');
djm@openbsd.org357128a2018-09-12 01:30:10 +0000744 else if (strcmp(optarg, "protocol-version") == 0)
djm@openbsd.org68d2dfc2015-03-03 06:48:58 +0000745 cp = xstrdup("2");
djm@openbsd.org357128a2018-09-12 01:30:10 +0000746 else if (strcmp(optarg, "help") == 0) {
747 cp = xstrdup(
748 "cipher\ncipher-auth\nkex\nkey\n"
749 "key-cert\nkey-plain\nmac\n"
750 "protocol-version\nsig");
djm@openbsd.org68d2dfc2015-03-03 06:48:58 +0000751 }
Damien Millerea111192013-04-23 19:24:32 +1000752 if (cp == NULL)
753 fatal("Unsupported query \"%s\"", optarg);
754 printf("%s\n", cp);
755 free(cp);
756 exit(0);
757 break;
Damien Miller95def091999-11-25 00:26:21 +1100758 case 'a':
759 options.forward_agent = 0;
760 break;
Damien Millerb1715dc2000-05-30 13:44:51 +1000761 case 'A':
762 options.forward_agent = 1;
763 break;
Damien Miller95def091999-11-25 00:26:21 +1100764 case 'k':
Damien Millere0113cc2003-11-24 13:10:09 +1100765 options.gss_deleg_creds = 0;
Damien Miller95def091999-11-25 00:26:21 +1100766 break;
Darren Tucker415bddc2007-06-12 23:43:16 +1000767 case 'K':
768 options.gss_authentication = 1;
769 options.gss_deleg_creds = 1;
770 break;
Damien Miller95def091999-11-25 00:26:21 +1100771 case 'i':
dtucker@openbsd.orge655ee02018-07-27 05:34:42 +0000772 p = tilde_expand_filename(optarg, getuid());
dtucker@openbsd.org03239c12015-10-25 23:42:00 +0000773 if (stat(p, &st) < 0)
Damien Millerf4614452001-07-14 12:18:10 +1000774 fprintf(stderr, "Warning: Identity file %s "
dtucker@openbsd.org03239c12015-10-25 23:42:00 +0000775 "not accessible: %s.\n", p,
Damien Miller3eb48b62005-03-01 21:15:46 +1100776 strerror(errno));
dtucker@openbsd.org03239c12015-10-25 23:42:00 +0000777 else
778 add_identity_file(&options, NULL, p, 1);
779 free(p);
Damien Miller95def091999-11-25 00:26:21 +1100780 break;
Ben Lindstromc5b68002001-07-04 04:52:03 +0000781 case 'I':
Damien Miller7ea845e2010-02-12 09:21:02 +1100782#ifdef ENABLE_PKCS11
dtucker@openbsd.org4f7cc2f2015-09-04 08:21:47 +0000783 free(options.pkcs11_provider);
Damien Miller7ea845e2010-02-12 09:21:02 +1100784 options.pkcs11_provider = xstrdup(optarg);
Ben Lindstrombcc18082001-08-06 21:59:25 +0000785#else
Damien Miller7ea845e2010-02-12 09:21:02 +1100786 fprintf(stderr, "no support for PKCS#11.\n");
Ben Lindstrombcc18082001-08-06 21:59:25 +0000787#endif
Ben Lindstromc5b68002001-07-04 04:52:03 +0000788 break;
djm@openbsd.orged877ef2016-07-15 00:24:30 +0000789 case 'J':
790 if (options.jump_host != NULL)
791 fatal("Only a single -J option permitted");
792 if (options.proxy_command != NULL)
793 fatal("Cannot specify -J with ProxyCommand");
794 if (parse_jump(optarg, &options, 1) == -1)
795 fatal("Invalid -J argument");
796 options.proxy_command = xstrdup("none");
797 break;
Damien Miller95def091999-11-25 00:26:21 +1100798 case 't':
Damien Miller21771e22011-05-15 08:45:50 +1000799 if (options.request_tty == REQUEST_TTY_YES)
800 options.request_tty = REQUEST_TTY_FORCE;
801 else
802 options.request_tty = REQUEST_TTY_YES;
Damien Miller95def091999-11-25 00:26:21 +1100803 break;
Damien Miller95def091999-11-25 00:26:21 +1100804 case 'v':
Darren Tuckere98dfa32003-07-19 19:54:31 +1000805 if (debug_flag == 0) {
Damien Millere4340be2000-09-16 13:29:08 +1100806 debug_flag = 1;
807 options.log_level = SYSLOG_LEVEL_DEBUG1;
Darren Tuckere98dfa32003-07-19 19:54:31 +1000808 } else {
djm@openbsd.orged877ef2016-07-15 00:24:30 +0000809 if (options.log_level < SYSLOG_LEVEL_DEBUG3) {
810 debug_flag++;
Darren Tuckere98dfa32003-07-19 19:54:31 +1000811 options.log_level++;
djm@openbsd.orged877ef2016-07-15 00:24:30 +0000812 }
Darren Tuckere98dfa32003-07-19 19:54:31 +1000813 }
Damien Miller03d4d7e2013-04-23 15:21:06 +1000814 break;
Damien Miller95def091999-11-25 00:26:21 +1100815 case 'V':
Damien Miller0c889cd2004-03-22 09:36:00 +1100816 fprintf(stderr, "%s, %s\n",
Damien Miller1f0311c2014-05-15 14:24:09 +1000817 SSH_RELEASE,
818#ifdef WITH_OPENSSL
819 SSLeay_version(SSLEAY_VERSION)
820#else
821 "without OpenSSL"
822#endif
823 );
Damien Miller95def091999-11-25 00:26:21 +1100824 if (opt == 'V')
825 exit(0);
Damien Miller95def091999-11-25 00:26:21 +1100826 break;
Damien Millerd27b9472005-12-13 19:29:02 +1100827 case 'w':
Damien Miller7b58e802005-12-13 19:33:19 +1100828 if (options.tun_open == -1)
829 options.tun_open = SSH_TUNMODE_DEFAULT;
Damien Millerd27b9472005-12-13 19:29:02 +1100830 options.tun_local = a2tun(optarg, &options.tun_remote);
Damien Miller7b58e802005-12-13 19:33:19 +1100831 if (options.tun_local == SSH_TUNID_ERR) {
Darren Tuckerd6173c02008-06-13 04:52:53 +1000832 fprintf(stderr,
833 "Bad tun device '%s'\n", optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100834 exit(255);
Damien Millerd27b9472005-12-13 19:29:02 +1100835 }
836 break;
Darren Tucker7ad8dd22010-01-12 19:40:27 +1100837 case 'W':
dtucker@openbsd.org8543ff32016-06-03 03:14:41 +0000838 if (options.stdio_forward_host != NULL)
Damien Millere1537f92010-01-26 13:26:22 +1100839 fatal("stdio forward already specified");
840 if (muxclient_command != 0)
841 fatal("Cannot specify stdio forward with -O");
Darren Tucker7ad8dd22010-01-12 19:40:27 +1100842 if (parse_forward(&fwd, optarg, 1, 0)) {
dtucker@openbsd.org8543ff32016-06-03 03:14:41 +0000843 options.stdio_forward_host = fwd.listen_host;
844 options.stdio_forward_port = fwd.listen_port;
Darren Tuckera627d422013-06-02 07:31:17 +1000845 free(fwd.connect_host);
Darren Tucker7ad8dd22010-01-12 19:40:27 +1100846 } else {
847 fprintf(stderr,
848 "Bad stdio forwarding specification '%s'\n",
849 optarg);
850 exit(255);
851 }
Damien Miller21771e22011-05-15 08:45:50 +1000852 options.request_tty = REQUEST_TTY_NO;
Darren Tucker7ad8dd22010-01-12 19:40:27 +1100853 no_shell_flag = 1;
Darren Tucker7ad8dd22010-01-12 19:40:27 +1100854 break;
Damien Miller95def091999-11-25 00:26:21 +1100855 case 'q':
856 options.log_level = SYSLOG_LEVEL_QUIET;
857 break;
Damien Miller95def091999-11-25 00:26:21 +1100858 case 'e':
859 if (optarg[0] == '^' && optarg[2] == 0 &&
Damien Millerf4614452001-07-14 12:18:10 +1000860 (u_char) optarg[1] >= 64 &&
861 (u_char) optarg[1] < 128)
Ben Lindstrom46c16222000-12-22 01:43:59 +0000862 options.escape_char = (u_char) optarg[1] & 31;
Damien Miller95def091999-11-25 00:26:21 +1100863 else if (strlen(optarg) == 1)
Ben Lindstrom46c16222000-12-22 01:43:59 +0000864 options.escape_char = (u_char) optarg[0];
Damien Miller95def091999-11-25 00:26:21 +1100865 else if (strcmp(optarg, "none") == 0)
Ben Lindstrom2b1f71b2001-06-05 20:32:21 +0000866 options.escape_char = SSH_ESCAPECHAR_NONE;
Damien Miller95def091999-11-25 00:26:21 +1100867 else {
Damien Millerf4614452001-07-14 12:18:10 +1000868 fprintf(stderr, "Bad escape character '%s'.\n",
869 optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100870 exit(255);
Damien Miller95def091999-11-25 00:26:21 +1100871 }
872 break;
Damien Miller95def091999-11-25 00:26:21 +1100873 case 'c':
djm@openbsd.orgcdccebd2017-04-30 23:15:04 +0000874 if (!ciphers_valid(*optarg == '+' ?
djm@openbsd.orgf9eca242015-07-30 00:01:34 +0000875 optarg + 1 : optarg)) {
djm@openbsd.orgf9eca242015-07-30 00:01:34 +0000876 fprintf(stderr, "Unknown cipher type '%s'\n",
877 optarg);
878 exit(255);
879 }
djm@openbsd.orgcdccebd2017-04-30 23:15:04 +0000880 free(options.ciphers);
881 options.ciphers = xstrdup(optarg);
Damien Miller95def091999-11-25 00:26:21 +1100882 break;
Ben Lindstrom06b33aa2001-02-15 03:01:59 +0000883 case 'm':
dtucker@openbsd.org4f7cc2f2015-09-04 08:21:47 +0000884 if (mac_valid(optarg)) {
885 free(options.macs);
Ben Lindstrom06b33aa2001-02-15 03:01:59 +0000886 options.macs = xstrdup(optarg);
dtucker@openbsd.org4f7cc2f2015-09-04 08:21:47 +0000887 } else {
Damien Millerf4614452001-07-14 12:18:10 +1000888 fprintf(stderr, "Unknown mac type '%s'\n",
889 optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100890 exit(255);
Ben Lindstrom06b33aa2001-02-15 03:01:59 +0000891 }
892 break;
Damien Miller0e220db2004-06-15 10:34:08 +1000893 case 'M':
Damien Millerd14b1e72005-06-16 13:19:41 +1000894 if (options.control_master == SSHCTL_MASTER_YES)
895 options.control_master = SSHCTL_MASTER_ASK;
896 else
897 options.control_master = SSHCTL_MASTER_YES;
Damien Miller0e220db2004-06-15 10:34:08 +1000898 break;
Damien Miller95def091999-11-25 00:26:21 +1100899 case 'p':
millert@openbsd.org887669e2017-10-21 23:06:24 +0000900 if (options.port == -1) {
901 options.port = a2port(optarg);
902 if (options.port <= 0) {
903 fprintf(stderr, "Bad port '%s'\n",
904 optarg);
905 exit(255);
906 }
Ben Lindstrom146edb92001-04-11 23:06:28 +0000907 }
Damien Miller95def091999-11-25 00:26:21 +1100908 break;
Damien Miller95def091999-11-25 00:26:21 +1100909 case 'l':
millert@openbsd.org887669e2017-10-21 23:06:24 +0000910 if (options.user == NULL)
911 options.user = optarg;
Damien Miller95def091999-11-25 00:26:21 +1100912 break;
Ben Lindstrom1a174712001-09-12 17:56:15 +0000913
Damien Miller95def091999-11-25 00:26:21 +1100914 case 'L':
Damien Miller4bf648f2009-02-14 16:28:21 +1100915 if (parse_forward(&fwd, optarg, 0, 0))
Damien Millerf91ee4c2005-03-01 21:24:33 +1100916 add_local_forward(&options, &fwd);
917 else {
Damien Millerf4614452001-07-14 12:18:10 +1000918 fprintf(stderr,
Damien Millerf91ee4c2005-03-01 21:24:33 +1100919 "Bad local forwarding specification '%s'\n",
Damien Millerf4614452001-07-14 12:18:10 +1000920 optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100921 exit(255);
Ben Lindstrom1a174712001-09-12 17:56:15 +0000922 }
Damien Millerf91ee4c2005-03-01 21:24:33 +1100923 break;
924
925 case 'R':
markus@openbsd.org609d7a62017-09-21 19:16:53 +0000926 if (parse_forward(&fwd, optarg, 0, 1) ||
927 parse_forward(&fwd, optarg, 1, 1)) {
Damien Millerf91ee4c2005-03-01 21:24:33 +1100928 add_remote_forward(&options, &fwd);
929 } else {
930 fprintf(stderr,
931 "Bad remote forwarding specification "
932 "'%s'\n", optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100933 exit(255);
Damien Millerf91ee4c2005-03-01 21:24:33 +1100934 }
Damien Miller95def091999-11-25 00:26:21 +1100935 break;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000936
937 case 'D':
Damien Miller4bf648f2009-02-14 16:28:21 +1100938 if (parse_forward(&fwd, optarg, 1, 0)) {
Damien Millera699d952008-11-03 19:27:34 +1100939 add_local_forward(&options, &fwd);
Damien Millerf91ee4c2005-03-01 21:24:33 +1100940 } else {
Damien Millera699d952008-11-03 19:27:34 +1100941 fprintf(stderr,
942 "Bad dynamic forwarding specification "
943 "'%s'\n", optarg);
Darren Tuckere9a9b712005-12-20 16:15:51 +1100944 exit(255);
Ben Lindstrom146edb92001-04-11 23:06:28 +0000945 }
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000946 break;
947
Damien Miller95def091999-11-25 00:26:21 +1100948 case 'C':
949 options.compression = 1;
950 break;
Damien Miller1383bd82000-04-06 12:32:37 +1000951 case 'N':
952 no_shell_flag = 1;
Damien Miller21771e22011-05-15 08:45:50 +1000953 options.request_tty = REQUEST_TTY_NO;
Damien Miller1383bd82000-04-06 12:32:37 +1000954 break;
Damien Miller1383bd82000-04-06 12:32:37 +1000955 case 'T':
Damien Miller21771e22011-05-15 08:45:50 +1000956 options.request_tty = REQUEST_TTY_NO;
Damien Miller1383bd82000-04-06 12:32:37 +1000957 break;
Damien Miller95def091999-11-25 00:26:21 +1100958 case 'o':
Damien Miller9836cf82003-12-17 16:30:06 +1100959 line = xstrdup(optarg);
djm@openbsd.org957fbce2014-10-08 22:20:25 +0000960 if (process_config_line(&options, pw,
961 host ? host : "", host ? host : "", line,
962 "command-line", 0, NULL, SSHCONF_USERCONF) != 0)
Darren Tuckere9a9b712005-12-20 16:15:51 +1100963 exit(255);
Darren Tuckera627d422013-06-02 07:31:17 +1000964 free(line);
Damien Miller95def091999-11-25 00:26:21 +1100965 break;
Damien Miller832562e2001-01-30 09:30:01 +1100966 case 's':
967 subsystem_flag = 1;
968 break;
Damien Miller0e220db2004-06-15 10:34:08 +1000969 case 'S':
mmcc@openbsd.orgd59ce082015-12-10 17:08:40 +0000970 free(options.control_path);
Damien Miller0e220db2004-06-15 10:34:08 +1000971 options.control_path = xstrdup(optarg);
Damien Miller0e220db2004-06-15 10:34:08 +1000972 break;
Ben Lindstrome0f88042001-04-30 13:06:24 +0000973 case 'b':
974 options.bind_address = optarg;
975 break;
djm@openbsd.orgac2e3022018-02-23 02:34:33 +0000976 case 'B':
977 options.bind_interface = optarg;
978 break;
Ben Lindstrom14f31ab2001-09-12 17:48:04 +0000979 case 'F':
980 config = optarg;
981 break;
Damien Miller95def091999-11-25 00:26:21 +1100982 default:
983 usage();
984 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000985 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000986
djm@openbsd.org643c2ad2017-08-12 06:46:01 +0000987 if (optind > 1 && strcmp(av[optind - 1], "--") == 0)
988 opt_terminated = 1;
989
Damien Millerf4614452001-07-14 12:18:10 +1000990 ac -= optind;
991 av += optind;
992
Darren Tuckerb8c884a2010-01-08 18:53:43 +1100993 if (ac > 0 && !host) {
millert@openbsd.org887669e2017-10-21 23:06:24 +0000994 int tport;
995 char *tuser;
996 switch (parse_ssh_uri(*av, &tuser, &host, &tport)) {
997 case -1:
998 usage();
999 break;
1000 case 0:
1001 if (options.user == NULL) {
1002 options.user = tuser;
1003 tuser = NULL;
1004 }
1005 free(tuser);
1006 if (options.port == -1 && tport != -1)
1007 options.port = tport;
1008 break;
1009 default:
Damien Millerf4614452001-07-14 12:18:10 +10001010 p = xstrdup(*av);
Ben Lindstromc276c122002-12-23 02:14:51 +00001011 cp = strrchr(p, '@');
millert@openbsd.org887669e2017-10-21 23:06:24 +00001012 if (cp != NULL) {
1013 if (cp == p)
1014 usage();
1015 if (options.user == NULL) {
1016 options.user = p;
1017 p = NULL;
1018 }
1019 *cp++ = '\0';
1020 host = xstrdup(cp);
1021 free(p);
1022 } else
1023 host = p;
1024 break;
1025 }
djm@openbsd.org643c2ad2017-08-12 06:46:01 +00001026 if (ac > 1 && !opt_terminated) {
Ben Lindstromb9fa6912002-12-23 02:24:54 +00001027 optind = optreset = 1;
Damien Millerf4614452001-07-14 12:18:10 +10001028 goto again;
1029 }
Ben Lindstromb9fa6912002-12-23 02:24:54 +00001030 ac--, av++;
Damien Millerf4614452001-07-14 12:18:10 +10001031 }
1032
Damien Miller95def091999-11-25 00:26:21 +11001033 /* Check that we got a host name. */
1034 if (!host)
1035 usage();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001036
Damien Miller0faf7472013-10-17 11:47:23 +11001037 host_arg = xstrdup(host);
1038
Damien Miller1f0311c2014-05-15 14:24:09 +10001039#ifdef WITH_OPENSSL
Damien Miller4314c2b2010-09-10 11:12:09 +10001040 OpenSSL_add_all_algorithms();
Damien Miller0bc1bd82000-11-13 22:57:25 +11001041 ERR_load_crypto_strings();
Damien Miller1f0311c2014-05-15 14:24:09 +10001042#endif
Damien Millercb5e44a2000-09-29 12:12:36 +11001043
Damien Miller95def091999-11-25 00:26:21 +11001044 /* Initialize the command to execute on remote host. */
markus@openbsd.orgcecee2d2018-07-09 21:03:30 +00001045 if ((command = sshbuf_new()) == NULL)
1046 fatal("sshbuf_new failed");
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001047
Damien Miller5428f641999-11-25 11:54:57 +11001048 /*
1049 * Save the command to execute on the remote host in a buffer. There
1050 * is no limit on the length of the command, except by the maximum
1051 * packet size. Also sets the tty flag if there is no command.
1052 */
Damien Millerf4614452001-07-14 12:18:10 +10001053 if (!ac) {
Damien Miller95def091999-11-25 00:26:21 +11001054 /* No command specified - execute shell on a tty. */
Damien Miller832562e2001-01-30 09:30:01 +11001055 if (subsystem_flag) {
Damien Millerf4614452001-07-14 12:18:10 +10001056 fprintf(stderr,
1057 "You must specify a subsystem to invoke.\n");
Damien Miller832562e2001-01-30 09:30:01 +11001058 usage();
1059 }
Damien Miller95def091999-11-25 00:26:21 +11001060 } else {
Damien Millerf4614452001-07-14 12:18:10 +10001061 /* A command has been specified. Store it into the buffer. */
1062 for (i = 0; i < ac; i++) {
markus@openbsd.orgcecee2d2018-07-09 21:03:30 +00001063 if ((r = sshbuf_putf(command, "%s%s",
1064 i ? " " : "", av[i])) != 0)
1065 fatal("%s: buffer error: %s",
1066 __func__, ssh_err(r));
Damien Miller95def091999-11-25 00:26:21 +11001067 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001068 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001069
Ben Lindstrom8a432f52001-03-05 07:24:46 +00001070 /*
1071 * Initialize "log" output. Since we are the client all output
Damien Miller03d4d7e2013-04-23 15:21:06 +10001072 * goes to stderr unless otherwise specified by -y or -E.
Ben Lindstrom8a432f52001-03-05 07:24:46 +00001073 */
Damien Miller03d4d7e2013-04-23 15:21:06 +10001074 if (use_syslog && logfile != NULL)
1075 fatal("Can't specify both -y and -E");
dtucker@openbsd.org4f7cc2f2015-09-04 08:21:47 +00001076 if (logfile != NULL)
Damien Miller03d4d7e2013-04-23 15:21:06 +10001077 log_redirect_stderr_to(logfile);
Darren Tucker72efd742009-06-21 17:48:00 +10001078 log_init(argv0,
djm@openbsd.org@openbsd.orgdbe06622017-10-27 01:57:06 +00001079 options.log_level == SYSLOG_LEVEL_NOT_SET ?
dtucker@openbsd.org68d3a2a2017-04-28 03:20:27 +00001080 SYSLOG_LEVEL_INFO : options.log_level,
djm@openbsd.org@openbsd.orgdbe06622017-10-27 01:57:06 +00001081 options.log_facility == SYSLOG_FACILITY_NOT_SET ?
dtucker@openbsd.org68d3a2a2017-04-28 03:20:27 +00001082 SYSLOG_FACILITY_USER : options.log_facility,
1083 !use_syslog);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001084
Damien Miller03d4d7e2013-04-23 15:21:06 +10001085 if (debug_flag)
Damien Miller1f0311c2014-05-15 14:24:09 +10001086 logit("%s, %s", SSH_RELEASE,
1087#ifdef WITH_OPENSSL
1088 SSLeay_version(SSLEAY_VERSION)
1089#else
1090 "without OpenSSL"
1091#endif
1092 );
Damien Miller03d4d7e2013-04-23 15:21:06 +10001093
Damien Miller13f97b22014-02-24 15:57:55 +11001094 /* Parse the configuration files */
djm@openbsd.org957fbce2014-10-08 22:20:25 +00001095 process_config_files(host_arg, pw, 0);
Ben Lindstrom83f07d12001-10-03 17:22:29 +00001096
Damien Miller13f97b22014-02-24 15:57:55 +11001097 /* Hostname canonicalisation needs a few options filled. */
1098 fill_default_options_for_canonicalization(&options);
1099
1100 /* If the user has replaced the hostname then take it into use now */
1101 if (options.hostname != NULL) {
1102 /* NB. Please keep in sync with readconf.c:match_cfg_line() */
1103 cp = percent_expand(options.hostname,
1104 "h", host, (char *)NULL);
1105 free(host);
1106 host = cp;
djm@openbsd.org957fbce2014-10-08 22:20:25 +00001107 free(options.hostname);
1108 options.hostname = xstrdup(host);
Damien Miller13f97b22014-02-24 15:57:55 +11001109 }
1110
djm@openbsd.orgfc21ea92018-01-23 05:06:25 +00001111 /* Don't lowercase addresses, they will be explicitly canonicalised */
1112 if ((was_addr = is_addr(host)) == 0)
1113 lowercase(host);
1114
1115 /*
1116 * Try to canonicalize if requested by configuration or the
1117 * hostname is an address.
1118 */
1119 if (options.canonicalize_hostname != SSH_CANONICALISE_NO || was_addr)
Damien Miller13f97b22014-02-24 15:57:55 +11001120 addrs = resolve_canonicalize(&host, options.port);
1121
1122 /*
Damien Miller08b57c62014-02-27 10:17:13 +11001123 * If CanonicalizePermittedCNAMEs have been specified but
1124 * other canonicalization did not happen (by not being requested
1125 * or by failing with fallback) then the hostname may still be changed
djm@openbsd.org@openbsd.orgdbe06622017-10-27 01:57:06 +00001126 * as a result of CNAME following.
Damien Miller08b57c62014-02-27 10:17:13 +11001127 *
1128 * Try to resolve the bare hostname name using the system resolver's
1129 * usual search rules and then apply the CNAME follow rules.
1130 *
1131 * Skip the lookup if a ProxyCommand is being used unless the user
1132 * has specifically requested canonicalisation for this case via
1133 * CanonicalizeHostname=always
Damien Miller13f97b22014-02-24 15:57:55 +11001134 */
djm@openbsd.orged877ef2016-07-15 00:24:30 +00001135 direct = option_clear_or_none(options.proxy_command) &&
1136 options.jump_host == NULL;
1137 if (addrs == NULL && options.num_permitted_cnames != 0 && (direct ||
1138 options.canonicalize_hostname == SSH_CANONICALISE_ALWAYS)) {
Damien Miller19439e92014-07-02 15:28:40 +10001139 if ((addrs = resolve_host(host, options.port,
1140 option_clear_or_none(options.proxy_command),
1141 cname, sizeof(cname))) == NULL) {
1142 /* Don't fatal proxied host names not in the DNS */
1143 if (option_clear_or_none(options.proxy_command))
1144 cleanup_exit(255); /* logged in resolve_host */
1145 } else
djm@openbsd.orged877ef2016-07-15 00:24:30 +00001146 check_follow_cname(direct, &host, cname);
Damien Miller13f97b22014-02-24 15:57:55 +11001147 }
1148
1149 /*
djm@openbsd.org957fbce2014-10-08 22:20:25 +00001150 * If canonicalisation is enabled then re-parse the configuration
1151 * files as new stanzas may match.
Damien Miller13f97b22014-02-24 15:57:55 +11001152 */
djm@openbsd.org957fbce2014-10-08 22:20:25 +00001153 if (options.canonicalize_hostname != 0) {
1154 debug("Re-reading configuration after hostname "
1155 "canonicalisation");
1156 free(options.hostname);
1157 options.hostname = xstrdup(host);
1158 process_config_files(host_arg, pw, 1);
1159 /*
1160 * Address resolution happens early with canonicalisation
1161 * enabled and the port number may have changed since, so
1162 * reset it in address list
1163 */
1164 if (addrs != NULL && options.port > 0)
1165 set_addrinfo_port(addrs, options.port);
Ben Lindstrom14f31ab2001-09-12 17:48:04 +00001166 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001167
Damien Miller95def091999-11-25 00:26:21 +11001168 /* Fill configuration defaults. */
1169 fill_default_options(&options);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001170
djm@openbsd.orged877ef2016-07-15 00:24:30 +00001171 /*
1172 * If ProxyJump option specified, then construct a ProxyCommand now.
1173 */
1174 if (options.jump_host != NULL) {
1175 char port_s[8];
djm@openbsd.orgd8748b92018-06-01 03:11:49 +00001176 const char *sshbin = argv0;
1177
1178 /*
1179 * Try to use SSH indicated by argv[0], but fall back to
1180 * "ssh" if it appears unavailable.
1181 */
1182 if (strchr(argv0, '/') != NULL && access(argv0, X_OK) != 0)
1183 sshbin = "ssh";
djm@openbsd.orged877ef2016-07-15 00:24:30 +00001184
1185 /* Consistency check */
1186 if (options.proxy_command != NULL)
1187 fatal("inconsistent options: ProxyCommand+ProxyJump");
1188 /* Never use FD passing for ProxyJump */
1189 options.proxy_use_fdpass = 0;
1190 snprintf(port_s, sizeof(port_s), "%d", options.jump_port);
1191 xasprintf(&options.proxy_command,
djm@openbsd.orgd8748b92018-06-01 03:11:49 +00001192 "%s%s%s%s%s%s%s%s%s%s%.*s -W '[%%h]:%%p' %s",
1193 sshbin,
djm@openbsd.orged877ef2016-07-15 00:24:30 +00001194 /* Optional "-l user" argument if jump_user set */
1195 options.jump_user == NULL ? "" : " -l ",
1196 options.jump_user == NULL ? "" : options.jump_user,
1197 /* Optional "-p port" argument if jump_port set */
1198 options.jump_port <= 0 ? "" : " -p ",
1199 options.jump_port <= 0 ? "" : port_s,
1200 /* Optional additional jump hosts ",..." */
1201 options.jump_extra == NULL ? "" : " -J ",
1202 options.jump_extra == NULL ? "" : options.jump_extra,
1203 /* Optional "-F" argumment if -F specified */
1204 config == NULL ? "" : " -F ",
1205 config == NULL ? "" : config,
1206 /* Optional "-v" arguments if -v set */
1207 debug_flag ? " -" : "",
1208 debug_flag, "vvv",
1209 /* Mandatory hostname */
1210 options.jump_host);
1211 debug("Setting implicit ProxyCommand from ProxyJump: %s",
1212 options.proxy_command);
1213 }
1214
Damien Miller13f97b22014-02-24 15:57:55 +11001215 if (options.port == 0)
1216 options.port = default_ssh_port();
djm@openbsd.orgdbee4112017-09-12 06:32:07 +00001217 channel_set_af(ssh, options.address_family);
Darren Tucker0a4f04b2003-07-03 20:37:47 +10001218
Damien Millere9fc72e2013-10-15 12:14:12 +11001219 /* Tidy and check options */
1220 if (options.host_key_alias != NULL)
1221 lowercase(options.host_key_alias);
1222 if (options.proxy_command != NULL &&
1223 strcmp(options.proxy_command, "-") == 0 &&
1224 options.proxy_use_fdpass)
1225 fatal("ProxyCommand=- and ProxyUseFDPass are incompatible");
djm@openbsd.org44732de2015-02-20 22:17:21 +00001226 if (options.control_persist &&
1227 options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK) {
1228 debug("UpdateHostKeys=ask is incompatible with ControlPersist; "
1229 "disabling");
1230 options.update_hostkeys = 0;
1231 }
djm@openbsd.org88b6fcd2015-11-19 08:23:27 +00001232 if (options.connection_attempts <= 0)
1233 fatal("Invalid number of ConnectionAttempts");
Damien Millere9fc72e2013-10-15 12:14:12 +11001234
markus@openbsd.orgcecee2d2018-07-09 21:03:30 +00001235 if (sshbuf_len(command) != 0 && options.remote_command != NULL)
bluhm@openbsd.org1112b532017-05-30 18:58:37 +00001236 fatal("Cannot execute command-line and remote command.");
1237
1238 /* Cannot fork to background if no command. */
markus@openbsd.orgcecee2d2018-07-09 21:03:30 +00001239 if (fork_after_authentication_flag && sshbuf_len(command) == 0 &&
bluhm@openbsd.org1112b532017-05-30 18:58:37 +00001240 options.remote_command == NULL && !no_shell_flag)
1241 fatal("Cannot fork into background without a command "
1242 "to execute.");
1243
Damien Miller95def091999-11-25 00:26:21 +11001244 /* reinit */
dtucker@openbsd.org68d3a2a2017-04-28 03:20:27 +00001245 log_init(argv0, options.log_level, options.log_facility, !use_syslog);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001246
Damien Millerfff9f092012-07-06 13:45:01 +10001247 if (options.request_tty == REQUEST_TTY_YES ||
1248 options.request_tty == REQUEST_TTY_FORCE)
1249 tty_flag = 1;
1250
1251 /* Allocate a tty by default if no command specified. */
markus@openbsd.orgcecee2d2018-07-09 21:03:30 +00001252 if (sshbuf_len(command) == 0 && options.remote_command == NULL)
Damien Millerfff9f092012-07-06 13:45:01 +10001253 tty_flag = options.request_tty != REQUEST_TTY_NO;
1254
1255 /* Force no tty */
markus@openbsd.org8d057842016-09-30 09:19:13 +00001256 if (options.request_tty == REQUEST_TTY_NO ||
1257 (muxclient_command && muxclient_command != SSHMUX_COMMAND_PROXY))
Damien Millerfff9f092012-07-06 13:45:01 +10001258 tty_flag = 0;
1259 /* Do not allocate a tty if stdin is not a tty. */
1260 if ((!isatty(fileno(stdin)) || stdin_null_flag) &&
1261 options.request_tty != REQUEST_TTY_FORCE) {
1262 if (tty_flag)
1263 logit("Pseudo-terminal will not be allocated because "
1264 "stdin is not a terminal.");
1265 tty_flag = 0;
1266 }
1267
Damien Miller60bc5172001-03-19 09:38:15 +11001268 seed_rng();
1269
Damien Miller95def091999-11-25 00:26:21 +11001270 if (options.user == NULL)
1271 options.user = xstrdup(pw->pw_name);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001272
djm@openbsd.orgb7548b12017-10-23 05:08:00 +00001273 /* Set up strings used to percent_expand() arguments */
Damien Millerdfc85fa2011-05-15 08:44:02 +10001274 if (gethostname(thishost, sizeof(thishost)) == -1)
1275 fatal("gethostname: %s", strerror(errno));
1276 strlcpy(shorthost, thishost, sizeof(shorthost));
1277 shorthost[strcspn(thishost, ".")] = '\0';
1278 snprintf(portstr, sizeof(portstr), "%d", options.port);
djm@openbsd.org9c935dd2018-06-01 03:33:53 +00001279 snprintf(uidstr, sizeof(uidstr), "%llu",
1280 (unsigned long long)pw->pw_uid);
Darren Tuckerf6b01b72008-06-13 04:56:37 +10001281
Damien Miller9c386432014-07-03 21:27:46 +10001282 if ((md = ssh_digest_start(SSH_DIGEST_SHA1)) == NULL ||
1283 ssh_digest_update(md, thishost, strlen(thishost)) < 0 ||
1284 ssh_digest_update(md, host, strlen(host)) < 0 ||
1285 ssh_digest_update(md, portstr, strlen(portstr)) < 0 ||
1286 ssh_digest_update(md, options.user, strlen(options.user)) < 0 ||
1287 ssh_digest_final(md, conn_hash, sizeof(conn_hash)) < 0)
1288 fatal("%s: mux digest failed", __func__);
1289 ssh_digest_free(md);
1290 conn_hash_hex = tohex(conn_hash, ssh_digest_bytes(SSH_DIGEST_SHA1));
1291
djm@openbsd.orgb7548b12017-10-23 05:08:00 +00001292 /*
1293 * Expand tokens in arguments. NB. LocalCommand is expanded later,
1294 * after port-forwarding is set up, so it may pick up any local
1295 * tunnel interface name allocated.
1296 */
bluhm@openbsd.org1112b532017-05-30 18:58:37 +00001297 if (options.remote_command != NULL) {
1298 debug3("expanding RemoteCommand: %s", options.remote_command);
1299 cp = options.remote_command;
1300 options.remote_command = percent_expand(cp,
1301 "C", conn_hash_hex,
1302 "L", shorthost,
1303 "d", pw->pw_dir,
1304 "h", host,
djm@openbsd.org9c935dd2018-06-01 03:33:53 +00001305 "i", uidstr,
bluhm@openbsd.org1112b532017-05-30 18:58:37 +00001306 "l", thishost,
1307 "n", host_arg,
1308 "p", portstr,
1309 "r", options.user,
1310 "u", pw->pw_name,
1311 (char *)NULL);
1312 debug3("expanded RemoteCommand: %s", options.remote_command);
1313 free(cp);
markus@openbsd.orgcecee2d2018-07-09 21:03:30 +00001314 if ((r = sshbuf_put(command, options.remote_command,
1315 strlen(options.remote_command))) != 0)
1316 fatal("%s: buffer error: %s", __func__, ssh_err(r));
bluhm@openbsd.org1112b532017-05-30 18:58:37 +00001317 }
1318
Damien Miller0e220db2004-06-15 10:34:08 +10001319 if (options.control_path != NULL) {
dtucker@openbsd.orge655ee02018-07-27 05:34:42 +00001320 cp = tilde_expand_filename(options.control_path, getuid());
Darren Tuckera627d422013-06-02 07:31:17 +10001321 free(options.control_path);
Damien Miller9c386432014-07-03 21:27:46 +10001322 options.control_path = percent_expand(cp,
1323 "C", conn_hash_hex,
1324 "L", shorthost,
1325 "h", host,
djm@openbsd.org9c935dd2018-06-01 03:33:53 +00001326 "i", uidstr,
Damien Miller9c386432014-07-03 21:27:46 +10001327 "l", thishost,
1328 "n", host_arg,
1329 "p", portstr,
1330 "r", options.user,
1331 "u", pw->pw_name,
djm@openbsd.org674b3b62015-09-11 03:47:28 +00001332 "i", uidstr,
Damien Millerdfc85fa2011-05-15 08:44:02 +10001333 (char *)NULL);
Darren Tuckera627d422013-06-02 07:31:17 +10001334 free(cp);
Damien Miller0e220db2004-06-15 10:34:08 +10001335 }
Damien Miller9c386432014-07-03 21:27:46 +10001336
djm@openbsd.org957fbce2014-10-08 22:20:25 +00001337 if (config_test) {
1338 dump_client_config(&options, host);
1339 exit(0);
1340 }
1341
Damien Millerb1cbfa22008-05-19 16:00:08 +10001342 if (muxclient_command != 0 && options.control_path == NULL)
Darren Tucker0814d312005-06-01 23:08:51 +10001343 fatal("No ControlPath specified for \"-O\" command");
markus@openbsd.org8d057842016-09-30 09:19:13 +00001344 if (options.control_path != NULL) {
1345 int sock;
1346 if ((sock = muxclient(options.control_path)) >= 0) {
djm@openbsd.orgdbee4112017-09-12 06:32:07 +00001347 ssh_packet_set_connection(ssh, sock, sock);
markus@openbsd.org8d057842016-09-30 09:19:13 +00001348 packet_set_mux();
1349 goto skip_connect;
1350 }
1351 }
Damien Miller0e220db2004-06-15 10:34:08 +10001352
Damien Miller08b57c62014-02-27 10:17:13 +11001353 /*
1354 * If hostname canonicalisation was not enabled, then we may not
1355 * have yet resolved the hostname. Do so now.
1356 */
1357 if (addrs == NULL && options.proxy_command == NULL) {
djm@openbsd.orga85768a2015-09-04 04:56:09 +00001358 debug2("resolving \"%s\" port %d", host, options.port);
Damien Miller08b57c62014-02-27 10:17:13 +11001359 if ((addrs = resolve_host(host, options.port, 1,
1360 cname, sizeof(cname))) == NULL)
1361 cleanup_exit(255); /* resolve_host logs the error */
1362 }
1363
Damien Miller67bd0622007-09-17 12:06:57 +10001364 timeout_ms = options.connection_timeout * 1000;
1365
Kevin Stevesfcec7f82000-12-15 19:55:48 +00001366 /* Open a connection to the remote host. */
djm@openbsd.orgdbee4112017-09-12 06:32:07 +00001367 if (ssh_connect(ssh, host, addrs, &hostaddr, options.port,
Damien Miller0faf7472013-10-17 11:47:23 +11001368 options.address_family, options.connection_attempts,
dtucker@openbsd.org95d41e92018-07-19 10:28:47 +00001369 &timeout_ms, options.tcp_keep_alive) != 0)
Damien Miller0faf7472013-10-17 11:47:23 +11001370 exit(255);
1371
Damien Miller28631ce2013-10-26 10:07:56 +11001372 if (addrs != NULL)
1373 freeaddrinfo(addrs);
1374
Damien Miller0faf7472013-10-17 11:47:23 +11001375 packet_set_timeout(options.server_alive_interval,
1376 options.server_alive_count_max);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001377
djm@openbsd.org95767262016-03-07 19:02:43 +00001378 ssh = active_state; /* XXX */
1379
Damien Miller67bd0622007-09-17 12:06:57 +10001380 if (timeout_ms > 0)
1381 debug3("timeout: %d ms remain after connect", timeout_ms);
1382
Damien Miller5428f641999-11-25 11:54:57 +11001383 /*
dtucker@openbsd.org26efc2f2018-07-16 11:05:41 +00001384 * If we successfully made the connection and we have hostbased auth
1385 * enabled, load the public keys so we can later use the ssh-keysign
1386 * helper to sign challenges.
Damien Miller5428f641999-11-25 11:54:57 +11001387 */
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001388 sensitive_data.nkeys = 0;
1389 sensitive_data.keys = NULL;
djm@openbsd.org873d3e72017-04-30 23:18:44 +00001390 if (options.hostbased_authentication) {
dtucker@openbsd.orgac590762018-07-16 22:25:01 +00001391 sensitive_data.nkeys = 10;
Damien Millerddd63ab2006-03-31 23:10:51 +11001392 sensitive_data.keys = xcalloc(sensitive_data.nkeys,
markus@openbsd.org5467fbc2018-07-11 18:53:29 +00001393 sizeof(struct sshkey));
1394
1395 /* XXX check errors? */
dtucker@openbsd.orgac590762018-07-16 22:25:01 +00001396#define L_PUBKEY(p,o) do { \
1397 if ((o) >= sensitive_data.nkeys) \
1398 fatal("%s pubkey out of array bounds", __func__); \
markus@openbsd.org5467fbc2018-07-11 18:53:29 +00001399 check_load(sshkey_load_public(p, &(sensitive_data.keys[o]), NULL), \
dtucker@openbsd.orgac590762018-07-16 22:25:01 +00001400 p, "pubkey"); \
1401} while (0)
1402#define L_CERT(p,o) do { \
1403 if ((o) >= sensitive_data.nkeys) \
1404 fatal("%s cert out of array bounds", __func__); \
1405 check_load(sshkey_load_cert(p, &(sensitive_data.keys[o])), p, "cert"); \
1406} while (0)
Ben Lindstromf9c48842002-06-11 16:37:51 +00001407
dtucker@openbsd.org26efc2f2018-07-16 11:05:41 +00001408 if (options.hostbased_authentication == 1) {
dtucker@openbsd.orgac590762018-07-16 22:25:01 +00001409 L_CERT(_PATH_HOST_ECDSA_KEY_FILE, 0);
1410 L_CERT(_PATH_HOST_ED25519_KEY_FILE, 1);
1411 L_CERT(_PATH_HOST_RSA_KEY_FILE, 2);
1412 L_CERT(_PATH_HOST_DSA_KEY_FILE, 3);
1413 L_PUBKEY(_PATH_HOST_ECDSA_KEY_FILE, 4);
1414 L_PUBKEY(_PATH_HOST_ED25519_KEY_FILE, 5);
1415 L_PUBKEY(_PATH_HOST_RSA_KEY_FILE, 6);
1416 L_PUBKEY(_PATH_HOST_DSA_KEY_FILE, 7);
1417 L_CERT(_PATH_HOST_XMSS_KEY_FILE, 8);
1418 L_PUBKEY(_PATH_HOST_XMSS_KEY_FILE, 9);
Ben Lindstrom1bad2562002-06-06 19:57:33 +00001419 }
Damien Miller95def091999-11-25 00:26:21 +11001420 }
Damien Miller95def091999-11-25 00:26:21 +11001421
dtucker@openbsd.org258dc8b2018-07-18 11:34:04 +00001422 /* Create ~/.ssh * directory if it doesn't already exist. */
Darren Tucker45c66d72011-11-04 10:50:40 +11001423 if (config == NULL) {
1424 r = snprintf(buf, sizeof buf, "%s%s%s", pw->pw_dir,
1425 strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR);
1426 if (r > 0 && (size_t)r < sizeof(buf) && stat(buf, &st) < 0) {
Darren Tucker8ccb7392010-09-10 12:28:24 +10001427#ifdef WITH_SELINUX
Darren Tucker45c66d72011-11-04 10:50:40 +11001428 ssh_selinux_setfscreatecon(buf);
Darren Tucker8ccb7392010-09-10 12:28:24 +10001429#endif
Darren Tucker45c66d72011-11-04 10:50:40 +11001430 if (mkdir(buf, 0700) < 0)
1431 error("Could not create directory '%.200s'.",
1432 buf);
Darren Tucker8ccb7392010-09-10 12:28:24 +10001433#ifdef WITH_SELINUX
Darren Tucker45c66d72011-11-04 10:50:40 +11001434 ssh_selinux_setfscreatecon(NULL);
Darren Tucker8ccb7392010-09-10 12:28:24 +10001435#endif
Darren Tucker45c66d72011-11-04 10:50:40 +11001436 }
Darren Tucker8ccb7392010-09-10 12:28:24 +10001437 }
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001438 /* load options.identity_files */
djm@openbsd.orgb7548b12017-10-23 05:08:00 +00001439 load_public_identity_files(pw);
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001440
djm@openbsd.org001aa552018-04-10 00:10:49 +00001441 /* optionally set the SSH_AUTHSOCKET_ENV_NAME variable */
markus@openbsd.org1a75d142016-05-04 14:29:58 +00001442 if (options.identity_agent &&
1443 strcmp(options.identity_agent, SSH_AUTHSOCKET_ENV_NAME) != 0) {
markus@openbsd.orgb02ad1c2016-05-04 12:21:53 +00001444 if (strcmp(options.identity_agent, "none") == 0) {
1445 unsetenv(SSH_AUTHSOCKET_ENV_NAME);
1446 } else {
1447 p = tilde_expand_filename(options.identity_agent,
dtucker@openbsd.orge655ee02018-07-27 05:34:42 +00001448 getuid());
djm@openbsd.org9c935dd2018-06-01 03:33:53 +00001449 cp = percent_expand(p,
1450 "d", pw->pw_dir,
1451 "h", host,
1452 "i", uidstr,
1453 "l", thishost,
1454 "r", options.user,
1455 "u", pw->pw_name,
1456 (char *)NULL);
markus@openbsd.orgb02ad1c2016-05-04 12:21:53 +00001457 setenv(SSH_AUTHSOCKET_ENV_NAME, cp, 1);
1458 free(cp);
1459 free(p);
1460 }
1461 }
1462
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001463 /* Expand ~ in known host file names. */
Damien Miller295ee632011-05-29 21:42:31 +10001464 tilde_expand_paths(options.system_hostfiles,
1465 options.num_system_hostfiles);
1466 tilde_expand_paths(options.user_hostfiles, options.num_user_hostfiles);
Damien Miller95def091999-11-25 00:26:21 +11001467
Damien Miller07cd5892001-11-12 10:52:03 +11001468 signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
Damien Miller857b02e2010-09-24 22:02:56 +10001469 signal(SIGCHLD, main_sigchld_handler);
Damien Miller07cd5892001-11-12 10:52:03 +11001470
Darren Tuckerd6173c02008-06-13 04:52:53 +10001471 /* Log into the remote system. Never returns if the login fails. */
Damien Miller67bd0622007-09-17 12:06:57 +10001472 ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr,
Damien Millerd925dcd2010-12-01 12:21:51 +11001473 options.port, pw, timeout_ms);
Damien Miller95def091999-11-25 00:26:21 +11001474
Damien Miller383ffe62010-06-26 10:02:03 +10001475 if (packet_connection_is_on_socket()) {
1476 verbose("Authenticated to %s ([%s]:%d).", host,
djm@openbsd.org95767262016-03-07 19:02:43 +00001477 ssh_remote_ipaddr(ssh), ssh_remote_port(ssh));
Damien Miller383ffe62010-06-26 10:02:03 +10001478 } else {
1479 verbose("Authenticated to %s (via proxy).", host);
1480 }
1481
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001482 /* We no longer need the private host keys. Clear them now. */
1483 if (sensitive_data.nkeys != 0) {
1484 for (i = 0; i < sensitive_data.nkeys; i++) {
1485 if (sensitive_data.keys[i] != NULL) {
1486 /* Destroys contents safely */
1487 debug3("clear hostkey %d", i);
markus@openbsd.org5467fbc2018-07-11 18:53:29 +00001488 sshkey_free(sensitive_data.keys[i]);
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001489 sensitive_data.keys[i] = NULL;
1490 }
1491 }
Darren Tuckera627d422013-06-02 07:31:17 +10001492 free(sensitive_data.keys);
Ben Lindstrom5eabda32001-04-12 23:34:34 +00001493 }
Ben Lindstroma6c8a8d2001-08-06 21:42:00 +00001494 for (i = 0; i < options.num_identity_files; i++) {
Darren Tuckera627d422013-06-02 07:31:17 +10001495 free(options.identity_files[i]);
1496 options.identity_files[i] = NULL;
Ben Lindstroma6c8a8d2001-08-06 21:42:00 +00001497 if (options.identity_keys[i]) {
markus@openbsd.org5467fbc2018-07-11 18:53:29 +00001498 sshkey_free(options.identity_keys[i]);
Ben Lindstroma6c8a8d2001-08-06 21:42:00 +00001499 options.identity_keys[i] = NULL;
1500 }
1501 }
djm@openbsd.org4e44a792015-09-24 06:15:11 +00001502 for (i = 0; i < options.num_certificate_files; i++) {
1503 free(options.certificate_files[i]);
1504 options.certificate_files[i] = NULL;
1505 }
Damien Miller95def091999-11-25 00:26:21 +11001506
markus@openbsd.org8d057842016-09-30 09:19:13 +00001507 skip_connect:
djm@openbsd.orgb7548b12017-10-23 05:08:00 +00001508 exit_status = ssh_session2(ssh, pw);
Damien Miller1383bd82000-04-06 12:32:37 +10001509 packet_close();
Damien Miller8c4e18a2002-09-19 12:05:02 +10001510
Damien Millerb1cbfa22008-05-19 16:00:08 +10001511 if (options.control_path != NULL && muxserver_sock != -1)
Damien Miller0e220db2004-06-15 10:34:08 +10001512 unlink(options.control_path);
1513
Damien Millera41ccca2010-10-07 22:07:32 +11001514 /* Kill ProxyCommand if it is running. */
1515 ssh_kill_proxy_command();
Damien Miller8c4e18a2002-09-19 12:05:02 +10001516
Damien Miller1383bd82000-04-06 12:32:37 +10001517 return exit_status;
1518}
1519
Damien Millere11e1ea2010-08-03 16:04:46 +10001520static void
1521control_persist_detach(void)
1522{
1523 pid_t pid;
djm@openbsd.orgd2d6bf82016-04-29 08:07:53 +00001524 int devnull, keep_stderr;
Damien Millere11e1ea2010-08-03 16:04:46 +10001525
1526 debug("%s: backgrounding master process", __func__);
1527
djm@openbsd.orgb8bbff32018-02-13 03:36:56 +00001528 /*
1529 * master (current process) into the background, and make the
1530 * foreground process a client of the backgrounded master.
1531 */
Damien Millere11e1ea2010-08-03 16:04:46 +10001532 switch ((pid = fork())) {
1533 case -1:
1534 fatal("%s: fork: %s", __func__, strerror(errno));
1535 case 0:
1536 /* Child: master process continues mainloop */
djm@openbsd.orgb8bbff32018-02-13 03:36:56 +00001537 break;
1538 default:
Damien Millere11e1ea2010-08-03 16:04:46 +10001539 /* Parent: set up mux slave to connect to backgrounded master */
1540 debug2("%s: background process is %ld", __func__, (long)pid);
1541 stdin_null_flag = ostdin_null_flag;
Damien Miller21771e22011-05-15 08:45:50 +10001542 options.request_tty = orequest_tty;
Damien Millere11e1ea2010-08-03 16:04:46 +10001543 tty_flag = otty_flag;
djm@openbsd.orgb8bbff32018-02-13 03:36:56 +00001544 close(muxserver_sock);
1545 muxserver_sock = -1;
Damien Miller5929c522010-09-10 11:17:02 +10001546 options.control_master = SSHCTL_MASTER_NO;
djm@openbsd.orgb8bbff32018-02-13 03:36:56 +00001547 muxclient(options.control_path);
Damien Millere11e1ea2010-08-03 16:04:46 +10001548 /* muxclient() doesn't return on success. */
djm@openbsd.orgb8bbff32018-02-13 03:36:56 +00001549 fatal("Failed to connect to new control master");
1550 }
Damien Miller00d9ae22010-08-17 01:59:31 +10001551 if ((devnull = open(_PATH_DEVNULL, O_RDWR)) == -1) {
1552 error("%s: open(\"/dev/null\"): %s", __func__,
1553 strerror(errno));
1554 } else {
djm@openbsd.orgd2d6bf82016-04-29 08:07:53 +00001555 keep_stderr = log_is_on_stderr() && debug_flag;
Damien Miller00d9ae22010-08-17 01:59:31 +10001556 if (dup2(devnull, STDIN_FILENO) == -1 ||
djm@openbsd.orgd2d6bf82016-04-29 08:07:53 +00001557 dup2(devnull, STDOUT_FILENO) == -1 ||
1558 (!keep_stderr && dup2(devnull, STDERR_FILENO) == -1))
Damien Miller00d9ae22010-08-17 01:59:31 +10001559 error("%s: dup2: %s", __func__, strerror(errno));
1560 if (devnull > STDERR_FILENO)
1561 close(devnull);
1562 }
Damien Miller98e27dc2013-07-25 11:55:52 +10001563 daemon(1, 1);
Damien Millerea2c1a42011-06-03 12:10:22 +10001564 setproctitle("%s [mux]", options.control_path);
Damien Millere11e1ea2010-08-03 16:04:46 +10001565}
1566
1567/* Do fork() after authentication. Used by "ssh -f" */
1568static void
1569fork_postauth(void)
1570{
1571 if (need_controlpersist_detach)
1572 control_persist_detach();
1573 debug("forking to background");
1574 fork_after_authentication_flag = 0;
1575 if (daemon(1, 1) < 0)
1576 fatal("daemon() failed: %.200s", strerror(errno));
1577}
1578
Darren Tucker9f407c42008-06-13 04:50:27 +10001579/* Callback for remote forward global requests */
1580static void
djm@openbsd.orgdbee4112017-09-12 06:32:07 +00001581ssh_confirm_remote_forward(struct ssh *ssh, int type, u_int32_t seq, void *ctxt)
Darren Tucker9f407c42008-06-13 04:50:27 +10001582{
Damien Miller7acefbb2014-07-18 14:11:24 +10001583 struct Forward *rfwd = (struct Forward *)ctxt;
Darren Tucker9f407c42008-06-13 04:50:27 +10001584
Damien Miller4bf648f2009-02-14 16:28:21 +11001585 /* XXX verbose() on failure? */
Damien Miller4b3ed642014-07-02 15:29:40 +10001586 debug("remote forward %s for: listen %s%s%d, connect %s:%d",
Darren Tucker9f407c42008-06-13 04:50:27 +10001587 type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
Damien Miller7acefbb2014-07-18 14:11:24 +10001588 rfwd->listen_path ? rfwd->listen_path :
1589 rfwd->listen_host ? rfwd->listen_host : "",
1590 (rfwd->listen_path || rfwd->listen_host) ? ":" : "",
1591 rfwd->listen_port, rfwd->connect_path ? rfwd->connect_path :
1592 rfwd->connect_host, rfwd->connect_port);
1593 if (rfwd->listen_path == NULL && rfwd->listen_port == 0) {
Darren Tucker68afb8c2011-10-02 18:59:03 +11001594 if (type == SSH2_MSG_REQUEST_SUCCESS) {
1595 rfwd->allocated_port = packet_get_int();
1596 logit("Allocated port %u for remote forward to %s:%d",
1597 rfwd->allocated_port,
1598 rfwd->connect_host, rfwd->connect_port);
djm@openbsd.org115063a2018-06-06 18:22:41 +00001599 channel_update_permission(ssh,
djm@openbsd.orgdbee4112017-09-12 06:32:07 +00001600 rfwd->handle, rfwd->allocated_port);
Darren Tucker68afb8c2011-10-02 18:59:03 +11001601 } else {
djm@openbsd.org115063a2018-06-06 18:22:41 +00001602 channel_update_permission(ssh, rfwd->handle, -1);
Darren Tucker68afb8c2011-10-02 18:59:03 +11001603 }
Damien Miller4bf648f2009-02-14 16:28:21 +11001604 }
djm@openbsd.org@openbsd.orgdbe06622017-10-27 01:57:06 +00001605
Darren Tucker9f407c42008-06-13 04:50:27 +10001606 if (type == SSH2_MSG_REQUEST_FAILURE) {
Damien Miller7acefbb2014-07-18 14:11:24 +10001607 if (options.exit_on_forward_failure) {
1608 if (rfwd->listen_path != NULL)
1609 fatal("Error: remote port forwarding failed "
1610 "for listen path %s", rfwd->listen_path);
1611 else
1612 fatal("Error: remote port forwarding failed "
1613 "for listen port %d", rfwd->listen_port);
1614 } else {
1615 if (rfwd->listen_path != NULL)
1616 logit("Warning: remote port forwarding failed "
1617 "for listen path %s", rfwd->listen_path);
1618 else
1619 logit("Warning: remote port forwarding failed "
1620 "for listen port %d", rfwd->listen_port);
1621 }
Darren Tucker9f407c42008-06-13 04:50:27 +10001622 }
Darren Tucker9a2a6092008-07-04 12:53:50 +10001623 if (++remote_forward_confirms_received == options.num_remote_forwards) {
Darren Tucker9f407c42008-06-13 04:50:27 +10001624 debug("All remote forwarding requests processed");
Damien Millere11e1ea2010-08-03 16:04:46 +10001625 if (fork_after_authentication_flag)
1626 fork_postauth();
Darren Tucker9a2a6092008-07-04 12:53:50 +10001627 }
Darren Tucker9f407c42008-06-13 04:50:27 +10001628}
1629
Ben Lindstrombba81212001-06-25 05:01:22 +00001630static void
djm@openbsd.orgdbee4112017-09-12 06:32:07 +00001631client_cleanup_stdio_fwd(struct ssh *ssh, int id, void *arg)
Darren Tucker7ad8dd22010-01-12 19:40:27 +11001632{
1633 debug("stdio forwarding: done");
1634 cleanup_exit(0);
1635}
1636
Darren Tucker2d6665d2011-11-04 10:54:22 +11001637static void
djm@openbsd.orgdbee4112017-09-12 06:32:07 +00001638ssh_stdio_confirm(struct ssh *ssh, int id, int success, void *arg)
Damien Miller357610d2014-07-18 15:04:10 +10001639{
1640 if (!success)
1641 fatal("stdio forwarding failed");
1642}
1643
1644static void
djm@openbsd.orgdbee4112017-09-12 06:32:07 +00001645ssh_init_stdio_forwarding(struct ssh *ssh)
Darren Tucker7ad8dd22010-01-12 19:40:27 +11001646{
1647 Channel *c;
Damien Millere1537f92010-01-26 13:26:22 +11001648 int in, out;
Darren Tucker7ad8dd22010-01-12 19:40:27 +11001649
dtucker@openbsd.org8543ff32016-06-03 03:14:41 +00001650 if (options.stdio_forward_host == NULL)
Darren Tucker2d6665d2011-11-04 10:54:22 +11001651 return;
Damien Millere1537f92010-01-26 13:26:22 +11001652
dtucker@openbsd.org8543ff32016-06-03 03:14:41 +00001653 debug3("%s: %s:%d", __func__, options.stdio_forward_host,
1654 options.stdio_forward_port);
Darren Tucker2d6665d2011-11-04 10:54:22 +11001655
1656 if ((in = dup(STDIN_FILENO)) < 0 ||
1657 (out = dup(STDOUT_FILENO)) < 0)
Damien Millere1537f92010-01-26 13:26:22 +11001658 fatal("channel_connect_stdio_fwd: dup() in/out failed");
djm@openbsd.orgdbee4112017-09-12 06:32:07 +00001659 if ((c = channel_connect_stdio_fwd(ssh, options.stdio_forward_host,
dtucker@openbsd.org8543ff32016-06-03 03:14:41 +00001660 options.stdio_forward_port, in, out)) == NULL)
Darren Tucker2d6665d2011-11-04 10:54:22 +11001661 fatal("%s: channel_connect_stdio_fwd failed", __func__);
djm@openbsd.orgdbee4112017-09-12 06:32:07 +00001662 channel_register_cleanup(ssh, c->self, client_cleanup_stdio_fwd, 0);
1663 channel_register_open_confirm(ssh, c->self, ssh_stdio_confirm, NULL);
Darren Tucker7ad8dd22010-01-12 19:40:27 +11001664}
1665
1666static void
djm@openbsd.orgb7548b12017-10-23 05:08:00 +00001667ssh_init_forwarding(struct ssh *ssh, char **ifname)
Damien Miller0bc1bd82000-11-13 22:57:25 +11001668{
Kevin Steves12057502001-02-05 14:54:34 +00001669 int success = 0;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001670 int i;
Kevin Steves12057502001-02-05 14:54:34 +00001671
Damien Miller0bc1bd82000-11-13 22:57:25 +11001672 /* Initiate local TCP/IP port forwardings. */
1673 for (i = 0; i < options.num_local_forwards; i++) {
Damien Millerf91ee4c2005-03-01 21:24:33 +11001674 debug("Local connections to %.200s:%d forwarded to remote "
1675 "address %.200s:%d",
Damien Miller7acefbb2014-07-18 14:11:24 +10001676 (options.local_forwards[i].listen_path != NULL) ?
1677 options.local_forwards[i].listen_path :
Darren Tucker47eede72005-03-14 23:08:12 +11001678 (options.local_forwards[i].listen_host == NULL) ?
Damien Miller7acefbb2014-07-18 14:11:24 +10001679 (options.fwd_opts.gateway_ports ? "*" : "LOCALHOST") :
Damien Millerf91ee4c2005-03-01 21:24:33 +11001680 options.local_forwards[i].listen_host,
1681 options.local_forwards[i].listen_port,
Damien Miller7acefbb2014-07-18 14:11:24 +10001682 (options.local_forwards[i].connect_path != NULL) ?
1683 options.local_forwards[i].connect_path :
Damien Millerf91ee4c2005-03-01 21:24:33 +11001684 options.local_forwards[i].connect_host,
1685 options.local_forwards[i].connect_port);
djm@openbsd.orgdbee4112017-09-12 06:32:07 +00001686 success += channel_setup_local_fwd_listener(ssh,
Damien Miller7acefbb2014-07-18 14:11:24 +10001687 &options.local_forwards[i], &options.fwd_opts);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001688 }
Darren Tuckere7d4b192006-07-12 22:17:10 +10001689 if (i > 0 && success != i && options.exit_on_forward_failure)
1690 fatal("Could not request local forwarding.");
Kevin Steves12057502001-02-05 14:54:34 +00001691 if (i > 0 && success == 0)
1692 error("Could not request local forwarding.");
Damien Miller0bc1bd82000-11-13 22:57:25 +11001693
1694 /* Initiate remote TCP/IP port forwardings. */
1695 for (i = 0; i < options.num_remote_forwards; i++) {
Damien Millerf91ee4c2005-03-01 21:24:33 +11001696 debug("Remote connections from %.200s:%d forwarded to "
1697 "local address %.200s:%d",
Damien Miller7acefbb2014-07-18 14:11:24 +10001698 (options.remote_forwards[i].listen_path != NULL) ?
1699 options.remote_forwards[i].listen_path :
Damien Miller46d38de2005-07-17 17:02:09 +10001700 (options.remote_forwards[i].listen_host == NULL) ?
Damien Milleraa3bb102005-11-05 15:12:59 +11001701 "LOCALHOST" : options.remote_forwards[i].listen_host,
Damien Millerf91ee4c2005-03-01 21:24:33 +11001702 options.remote_forwards[i].listen_port,
Damien Miller7acefbb2014-07-18 14:11:24 +10001703 (options.remote_forwards[i].connect_path != NULL) ?
1704 options.remote_forwards[i].connect_path :
Damien Millerf91ee4c2005-03-01 21:24:33 +11001705 options.remote_forwards[i].connect_host,
1706 options.remote_forwards[i].connect_port);
Darren Tucker68afb8c2011-10-02 18:59:03 +11001707 options.remote_forwards[i].handle =
djm@openbsd.orgdbee4112017-09-12 06:32:07 +00001708 channel_request_remote_forwarding(ssh,
Damien Miller7acefbb2014-07-18 14:11:24 +10001709 &options.remote_forwards[i]);
Darren Tucker68afb8c2011-10-02 18:59:03 +11001710 if (options.remote_forwards[i].handle < 0) {
Darren Tuckere7d4b192006-07-12 22:17:10 +10001711 if (options.exit_on_forward_failure)
1712 fatal("Could not request remote forwarding.");
1713 else
1714 logit("Warning: Could not request remote "
1715 "forwarding.");
Darren Tucker68afb8c2011-10-02 18:59:03 +11001716 } else {
djm@openbsd.orgdbee4112017-09-12 06:32:07 +00001717 client_register_global_confirm(
1718 ssh_confirm_remote_forward,
Darren Tucker68afb8c2011-10-02 18:59:03 +11001719 &options.remote_forwards[i]);
Darren Tuckere7d4b192006-07-12 22:17:10 +10001720 }
Damien Miller0bc1bd82000-11-13 22:57:25 +11001721 }
Damien Millerb3ce9fe2007-08-08 14:32:41 +10001722
1723 /* Initiate tunnel forwarding. */
1724 if (options.tun_open != SSH_TUNMODE_NO) {
djm@openbsd.orgb7548b12017-10-23 05:08:00 +00001725 if ((*ifname = client_request_tun_fwd(ssh,
1726 options.tun_open, options.tun_local,
1727 options.tun_remote)) == NULL) {
Damien Millerb3ce9fe2007-08-08 14:32:41 +10001728 if (options.exit_on_forward_failure)
1729 fatal("Could not request tunnel forwarding.");
1730 else
1731 error("Could not request tunnel forwarding.");
1732 }
djm@openbsd.org@openbsd.orgdbe06622017-10-27 01:57:06 +00001733 }
Damien Miller0bc1bd82000-11-13 22:57:25 +11001734}
1735
Ben Lindstrombba81212001-06-25 05:01:22 +00001736static void
Damien Miller0bc1bd82000-11-13 22:57:25 +11001737check_agent_present(void)
1738{
djm@openbsd.org141efe42015-01-14 20:05:27 +00001739 int r;
1740
Damien Miller0bc1bd82000-11-13 22:57:25 +11001741 if (options.forward_agent) {
Damien Miller788f2122005-11-05 15:14:59 +11001742 /* Clear agent forwarding if we don't have an agent. */
djm@openbsd.org141efe42015-01-14 20:05:27 +00001743 if ((r = ssh_get_authentication_socket(NULL)) != 0) {
Damien Miller0bc1bd82000-11-13 22:57:25 +11001744 options.forward_agent = 0;
djm@openbsd.org141efe42015-01-14 20:05:27 +00001745 if (r != SSH_ERR_AGENT_NOT_PRESENT)
1746 debug("ssh_get_authentication_socket: %s",
1747 ssh_err(r));
1748 }
Damien Miller0bc1bd82000-11-13 22:57:25 +11001749 }
1750}
1751
Ben Lindstrombba81212001-06-25 05:01:22 +00001752static void
djm@openbsd.orgdbee4112017-09-12 06:32:07 +00001753ssh_session2_setup(struct ssh *ssh, int id, int success, void *arg)
Damien Miller1383bd82000-04-06 12:32:37 +10001754{
Damien Miller3756dce2004-06-18 01:17:29 +10001755 extern char **environ;
Damien Miller17e7ed02005-06-17 12:54:33 +10001756 const char *display;
Damien Miller0e220db2004-06-15 10:34:08 +10001757 int interactive = tty_flag;
djm@openbsd.orged4ce822016-01-13 23:04:47 +00001758 char *proto = NULL, *data = NULL;
Damien Miller17e7ed02005-06-17 12:54:33 +10001759
Damien Millerd530f5f2010-05-21 14:57:10 +10001760 if (!success)
1761 return; /* No need for error message, channels code sens one */
1762
Damien Miller46d38de2005-07-17 17:02:09 +10001763 display = getenv("DISPLAY");
djm@openbsd.orga58be332015-04-17 13:16:48 +00001764 if (display == NULL && options.forward_x11)
1765 debug("X11 forwarding requested but DISPLAY not set");
djm@openbsd.orgdbee4112017-09-12 06:32:07 +00001766 if (options.forward_x11 && client_x11_get_proto(ssh, display,
djm@openbsd.orged4ce822016-01-13 23:04:47 +00001767 options.xauth_location, options.forward_x11_trusted,
1768 options.forward_x11_timeout, &proto, &data) == 0) {
Damien Millerbd483e72000-04-30 10:00:53 +10001769 /* Request forwarding with authentication spoofing. */
Darren Tuckerd6173c02008-06-13 04:52:53 +10001770 debug("Requesting X11 forwarding with authentication "
1771 "spoofing.");
djm@openbsd.orgdbee4112017-09-12 06:32:07 +00001772 x11_request_forwarding_with_spoofing(ssh, id, display, proto,
Damien Miller6d7b4372011-06-23 08:31:57 +10001773 data, 1);
djm@openbsd.orgdbee4112017-09-12 06:32:07 +00001774 client_expect_confirm(ssh, id, "X11 forwarding", CONFIRM_WARN);
Damien Miller6d7b4372011-06-23 08:31:57 +10001775 /* XXX exit_on_forward_failure */
Ben Lindstrombf555ba2001-01-18 02:04:35 +00001776 interactive = 1;
Damien Millerbd483e72000-04-30 10:00:53 +10001777 }
1778
Damien Miller0bc1bd82000-11-13 22:57:25 +11001779 check_agent_present();
1780 if (options.forward_agent) {
1781 debug("Requesting authentication agent forwarding.");
djm@openbsd.orgdbee4112017-09-12 06:32:07 +00001782 channel_request_start(ssh, id, "auth-agent-req@openssh.com", 0);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001783 packet_send();
1784 }
1785
Darren Tucker7b305012012-07-02 18:55:09 +10001786 /* Tell the packet module whether this is an interactive session. */
1787 packet_set_interactive(interactive,
1788 options.ip_qos_interactive, options.ip_qos_bulk);
1789
djm@openbsd.orgdbee4112017-09-12 06:32:07 +00001790 client_session2_setup(ssh, id, tty_flag, subsystem_flag, getenv("TERM"),
markus@openbsd.orgcecee2d2018-07-09 21:03:30 +00001791 NULL, fileno(stdin), command, environ);
Damien Miller1383bd82000-04-06 12:32:37 +10001792}
1793
Ben Lindstromf558cf62001-09-20 23:13:49 +00001794/* open new channel for a session */
Ben Lindstrombba81212001-06-25 05:01:22 +00001795static int
djm@openbsd.orgdbee4112017-09-12 06:32:07 +00001796ssh_session2_open(struct ssh *ssh)
Damien Miller1383bd82000-04-06 12:32:37 +10001797{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001798 Channel *c;
1799 int window, packetmax, in, out, err;
Damien Millerad833b32000-08-23 10:46:23 +10001800
Damien Millercaf6dd62000-08-29 11:33:50 +11001801 if (stdin_null_flag) {
Ben Lindstrom31ca54a2001-02-09 02:11:24 +00001802 in = open(_PATH_DEVNULL, O_RDONLY);
Damien Millercaf6dd62000-08-29 11:33:50 +11001803 } else {
1804 in = dup(STDIN_FILENO);
1805 }
1806 out = dup(STDOUT_FILENO);
1807 err = dup(STDERR_FILENO);
1808
1809 if (in < 0 || out < 0 || err < 0)
1810 fatal("dup() in/out/err failed");
1811
Damien Miller69b69aa2000-10-28 14:19:58 +11001812 /* enable nonblocking unless tty */
1813 if (!isatty(in))
1814 set_nonblock(in);
1815 if (!isatty(out))
1816 set_nonblock(out);
1817 if (!isatty(err))
1818 set_nonblock(err);
1819
Damien Millere4340be2000-09-16 13:29:08 +11001820 window = CHAN_SES_WINDOW_DEFAULT;
1821 packetmax = CHAN_SES_PACKET_DEFAULT;
Damien Miller19a59452002-02-19 15:20:57 +11001822 if (tty_flag) {
1823 window >>= 1;
1824 packetmax >>= 1;
Damien Miller1383bd82000-04-06 12:32:37 +10001825 }
djm@openbsd.orgdbee4112017-09-12 06:32:07 +00001826 c = channel_new(ssh,
Damien Miller1383bd82000-04-06 12:32:37 +10001827 "session", SSH_CHANNEL_OPENING, in, out, err,
Damien Millere4340be2000-09-16 13:29:08 +11001828 window, packetmax, CHAN_EXTENDED_WRITE,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10001829 "client-session", /*nonblock*/0);
Damien Miller1383bd82000-04-06 12:32:37 +10001830
djm@openbsd.orgdbee4112017-09-12 06:32:07 +00001831 debug3("%s: channel_new: %d", __func__, c->self);
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001832
djm@openbsd.orgdbee4112017-09-12 06:32:07 +00001833 channel_send_open(ssh, c->self);
Ben Lindstromf558cf62001-09-20 23:13:49 +00001834 if (!no_shell_flag)
djm@openbsd.orgdbee4112017-09-12 06:32:07 +00001835 channel_register_open_confirm(ssh, c->self,
Damien Millerb84886b2008-05-19 15:05:07 +10001836 ssh_session2_setup, NULL);
Damien Miller1383bd82000-04-06 12:32:37 +10001837
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001838 return c->self;
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001839}
1840
Ben Lindstrombba81212001-06-25 05:01:22 +00001841static int
djm@openbsd.orgb7548b12017-10-23 05:08:00 +00001842ssh_session2(struct ssh *ssh, struct passwd *pw)
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001843{
djm@openbsd.org4d5456c2017-10-25 00:21:37 +00001844 int devnull, id = -1;
djm@openbsd.orgb7548b12017-10-23 05:08:00 +00001845 char *cp, *tun_fwd_ifname = NULL;
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001846
1847 /* XXX should be pre-session */
Darren Tucker2d6665d2011-11-04 10:54:22 +11001848 if (!options.control_persist)
djm@openbsd.orgdbee4112017-09-12 06:32:07 +00001849 ssh_init_stdio_forwarding(ssh);
djm@openbsd.orgb7548b12017-10-23 05:08:00 +00001850
1851 ssh_init_forwarding(ssh, &tun_fwd_ifname);
1852
1853 if (options.local_command != NULL) {
1854 debug3("expanding LocalCommand: %s", options.local_command);
1855 cp = options.local_command;
1856 options.local_command = percent_expand(cp,
1857 "C", conn_hash_hex,
1858 "L", shorthost,
1859 "d", pw->pw_dir,
1860 "h", host,
djm@openbsd.org9c935dd2018-06-01 03:33:53 +00001861 "i", uidstr,
djm@openbsd.orgb7548b12017-10-23 05:08:00 +00001862 "l", thishost,
1863 "n", host_arg,
1864 "p", portstr,
1865 "r", options.user,
1866 "u", pw->pw_name,
1867 "T", tun_fwd_ifname == NULL ? "NONE" : tun_fwd_ifname,
1868 (char *)NULL);
1869 debug3("expanded LocalCommand: %s", options.local_command);
1870 free(cp);
1871 }
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001872
Damien Millere11e1ea2010-08-03 16:04:46 +10001873 /* Start listening for multiplex clients */
markus@openbsd.org8d057842016-09-30 09:19:13 +00001874 if (!packet_get_mux())
djm@openbsd.orgdbee4112017-09-12 06:32:07 +00001875 muxserver_listen(ssh);
Damien Millere11e1ea2010-08-03 16:04:46 +10001876
djm@openbsd.orgb8bbff32018-02-13 03:36:56 +00001877 /*
Darren Tucker2d6665d2011-11-04 10:54:22 +11001878 * If we are in control persist mode and have a working mux listen
1879 * socket, then prepare to background ourselves and have a foreground
1880 * client attach as a control slave.
1881 * NB. we must save copies of the flags that we override for
Damien Millere11e1ea2010-08-03 16:04:46 +10001882 * the backgrounding, since we defer attachment of the slave until
1883 * after the connection is fully established (in particular,
1884 * async rfwd replies have been received for ExitOnForwardFailure).
1885 */
djm@openbsd.orgb8bbff32018-02-13 03:36:56 +00001886 if (options.control_persist && muxserver_sock != -1) {
Damien Millere11e1ea2010-08-03 16:04:46 +10001887 ostdin_null_flag = stdin_null_flag;
1888 ono_shell_flag = no_shell_flag;
Damien Miller21771e22011-05-15 08:45:50 +10001889 orequest_tty = options.request_tty;
Damien Millere11e1ea2010-08-03 16:04:46 +10001890 otty_flag = tty_flag;
djm@openbsd.orgb8bbff32018-02-13 03:36:56 +00001891 stdin_null_flag = 1;
1892 no_shell_flag = 1;
1893 tty_flag = 0;
Damien Millere11e1ea2010-08-03 16:04:46 +10001894 if (!fork_after_authentication_flag)
1895 need_controlpersist_detach = 1;
1896 fork_after_authentication_flag = 1;
djm@openbsd.orgb8bbff32018-02-13 03:36:56 +00001897 }
Darren Tucker2d6665d2011-11-04 10:54:22 +11001898 /*
1899 * ControlPersist mux listen socket setup failed, attempt the
1900 * stdio forward setup that we skipped earlier.
1901 */
1902 if (options.control_persist && muxserver_sock == -1)
djm@openbsd.orgdbee4112017-09-12 06:32:07 +00001903 ssh_init_stdio_forwarding(ssh);
Damien Millere11e1ea2010-08-03 16:04:46 +10001904
djm@openbsd.org14b5c632018-01-23 05:27:21 +00001905 if (!no_shell_flag)
djm@openbsd.orgdbee4112017-09-12 06:32:07 +00001906 id = ssh_session2_open(ssh);
Damien Miller649fe022013-07-18 16:13:55 +10001907 else {
1908 packet_set_interactive(
1909 options.control_master == SSHCTL_MASTER_NO,
1910 options.ip_qos_interactive, options.ip_qos_bulk);
1911 }
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001912
Darren Tucker8901fa92008-06-11 09:34:01 +10001913 /* If we don't expect to open a new session, then disallow it */
Damien Miller456e6f02008-11-03 19:20:10 +11001914 if (options.control_master == SSHCTL_MASTER_NO &&
1915 (datafellows & SSH_NEW_OPENSSH)) {
Darren Tucker8901fa92008-06-11 09:34:01 +10001916 debug("Requesting no-more-sessions@openssh.com");
1917 packet_start(SSH2_MSG_GLOBAL_REQUEST);
1918 packet_put_cstring("no-more-sessions@openssh.com");
1919 packet_put_char(0);
1920 packet_send();
1921 }
1922
Damien Millerd27b9472005-12-13 19:29:02 +11001923 /* Execute a local command */
1924 if (options.local_command != NULL &&
1925 options.permit_local_command)
1926 ssh_local_cmd(options.local_command);
1927
Damien Miller1f25ab42010-07-16 13:56:23 +10001928 /*
djm@openbsd.org4d5456c2017-10-25 00:21:37 +00001929 * stdout is now owned by the session channel; clobber it here
1930 * so future channel closes are propagated to the local fd.
1931 * NB. this can only happen after LocalCommand has completed,
1932 * as it may want to write to stdout.
1933 */
djm@openbsd.org@openbsd.org939b30b2017-11-01 00:04:15 +00001934 if (!need_controlpersist_detach) {
1935 if ((devnull = open(_PATH_DEVNULL, O_WRONLY)) == -1)
1936 error("%s: open %s: %s", __func__,
1937 _PATH_DEVNULL, strerror(errno));
1938 if (dup2(devnull, STDOUT_FILENO) < 0)
1939 fatal("%s: dup2() stdout failed", __func__);
1940 if (devnull > STDERR_FILENO)
1941 close(devnull);
1942 }
djm@openbsd.org4d5456c2017-10-25 00:21:37 +00001943
1944 /*
Damien Miller1f25ab42010-07-16 13:56:23 +10001945 * If requested and we are not interested in replies to remote
1946 * forwarding requests, then let ssh continue in the background.
1947 */
Damien Millere11e1ea2010-08-03 16:04:46 +10001948 if (fork_after_authentication_flag) {
1949 if (options.exit_on_forward_failure &&
1950 options.num_remote_forwards > 0) {
1951 debug("deferring postauth fork until remote forward "
1952 "confirmation received");
1953 } else
1954 fork_postauth();
Darren Tucker9a2a6092008-07-04 12:53:50 +10001955 }
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001956
djm@openbsd.orgdbee4112017-09-12 06:32:07 +00001957 return client_loop(ssh, tty_flag, tty_flag ?
Ben Lindstrom2b1f71b2001-06-05 20:32:21 +00001958 options.escape_char : SSH_ESCAPECHAR_NONE, id);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001959}
Damien Miller0bc1bd82000-11-13 22:57:25 +11001960
djm@openbsd.org4e44a792015-09-24 06:15:11 +00001961/* Loads all IdentityFile and CertificateFile keys */
Ben Lindstrombba81212001-06-25 05:01:22 +00001962static void
djm@openbsd.orgb7548b12017-10-23 05:08:00 +00001963load_public_identity_files(struct passwd *pw)
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001964{
djm@openbsd.orgb7548b12017-10-23 05:08:00 +00001965 char *filename, *cp;
markus@openbsd.org54d90ac2017-05-30 08:52:19 +00001966 struct sshkey *public;
djm@openbsd.org4e44a792015-09-24 06:15:11 +00001967 int i;
1968 u_int n_ids, n_certs;
Damien Miller0a80ca12010-02-27 07:55:05 +11001969 char *identity_files[SSH_MAX_IDENTITY_FILES];
markus@openbsd.org54d90ac2017-05-30 08:52:19 +00001970 struct sshkey *identity_keys[SSH_MAX_IDENTITY_FILES];
djm@openbsd.org3eb7f102018-07-16 07:06:50 +00001971 int identity_file_userprovided[SSH_MAX_IDENTITY_FILES];
djm@openbsd.org4e44a792015-09-24 06:15:11 +00001972 char *certificate_files[SSH_MAX_CERTIFICATE_FILES];
1973 struct sshkey *certificates[SSH_MAX_CERTIFICATE_FILES];
djm@openbsd.org3eb7f102018-07-16 07:06:50 +00001974 int certificate_file_userprovided[SSH_MAX_CERTIFICATE_FILES];
Damien Miller7ea845e2010-02-12 09:21:02 +11001975#ifdef ENABLE_PKCS11
markus@openbsd.org54d90ac2017-05-30 08:52:19 +00001976 struct sshkey **keys;
Damien Miller7ea845e2010-02-12 09:21:02 +11001977 int nkeys;
Damien Miller0a80ca12010-02-27 07:55:05 +11001978#endif /* PKCS11 */
Ben Lindstrom0936a5b2002-03-26 03:17:42 +00001979
djm@openbsd.org4e44a792015-09-24 06:15:11 +00001980 n_ids = n_certs = 0;
Damien Miller1d2c4562014-02-04 11:18:20 +11001981 memset(identity_files, 0, sizeof(identity_files));
1982 memset(identity_keys, 0, sizeof(identity_keys));
djm@openbsd.org3eb7f102018-07-16 07:06:50 +00001983 memset(identity_file_userprovided, 0,
1984 sizeof(identity_file_userprovided));
djm@openbsd.org4e44a792015-09-24 06:15:11 +00001985 memset(certificate_files, 0, sizeof(certificate_files));
1986 memset(certificates, 0, sizeof(certificates));
djm@openbsd.org3eb7f102018-07-16 07:06:50 +00001987 memset(certificate_file_userprovided, 0,
1988 sizeof(certificate_file_userprovided));
Damien Miller0a80ca12010-02-27 07:55:05 +11001989
1990#ifdef ENABLE_PKCS11
Damien Miller7ea845e2010-02-12 09:21:02 +11001991 if (options.pkcs11_provider != NULL &&
Ben Lindstrom0936a5b2002-03-26 03:17:42 +00001992 options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
Damien Miller7ea845e2010-02-12 09:21:02 +11001993 (pkcs11_init(!options.batch_mode) == 0) &&
1994 (nkeys = pkcs11_add_provider(options.pkcs11_provider, NULL,
1995 &keys)) > 0) {
Damien Miller7ea845e2010-02-12 09:21:02 +11001996 for (i = 0; i < nkeys; i++) {
Damien Miller0a80ca12010-02-27 07:55:05 +11001997 if (n_ids >= SSH_MAX_IDENTITY_FILES) {
markus@openbsd.org5467fbc2018-07-11 18:53:29 +00001998 sshkey_free(keys[i]);
Damien Miller0a80ca12010-02-27 07:55:05 +11001999 continue;
2000 }
2001 identity_keys[n_ids] = keys[i];
2002 identity_files[n_ids] =
Damien Miller7ea845e2010-02-12 09:21:02 +11002003 xstrdup(options.pkcs11_provider); /* XXX */
Damien Miller0a80ca12010-02-27 07:55:05 +11002004 n_ids++;
Ben Lindstrom0936a5b2002-03-26 03:17:42 +00002005 }
Darren Tuckera627d422013-06-02 07:31:17 +10002006 free(keys);
Ben Lindstrom711b04a2001-08-06 21:12:42 +00002007 }
Damien Miller7ea845e2010-02-12 09:21:02 +11002008#endif /* ENABLE_PKCS11 */
Damien Miller0a80ca12010-02-27 07:55:05 +11002009 for (i = 0; i < options.num_identity_files; i++) {
Darren Tucker15fd19c2013-04-05 11:22:26 +11002010 if (n_ids >= SSH_MAX_IDENTITY_FILES ||
2011 strcasecmp(options.identity_files[i], "none") == 0) {
Darren Tuckera627d422013-06-02 07:31:17 +10002012 free(options.identity_files[i]);
djm@openbsd.org4e44a792015-09-24 06:15:11 +00002013 options.identity_files[i] = NULL;
Damien Miller0a80ca12010-02-27 07:55:05 +11002014 continue;
2015 }
dtucker@openbsd.orge655ee02018-07-27 05:34:42 +00002016 cp = tilde_expand_filename(options.identity_files[i], getuid());
djm@openbsd.orgb7548b12017-10-23 05:08:00 +00002017 filename = percent_expand(cp, "d", pw->pw_dir,
2018 "u", pw->pw_name, "l", thishost, "h", host,
Damien Miller6b1d53c2006-03-31 23:13:21 +11002019 "r", options.user, (char *)NULL);
Darren Tuckera627d422013-06-02 07:31:17 +10002020 free(cp);
markus@openbsd.org5467fbc2018-07-11 18:53:29 +00002021 check_load(sshkey_load_public(filename, &public, NULL),
2022 filename, "pubkey");
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00002023 debug("identity file %s type %d", filename,
2024 public ? public->type : -1);
Darren Tuckera627d422013-06-02 07:31:17 +10002025 free(options.identity_files[i]);
Damien Miller0a80ca12010-02-27 07:55:05 +11002026 identity_files[n_ids] = filename;
2027 identity_keys[n_ids] = public;
djm@openbsd.org3eb7f102018-07-16 07:06:50 +00002028 identity_file_userprovided[n_ids] =
2029 options.identity_file_userprovided[i];
Damien Miller0a80ca12010-02-27 07:55:05 +11002030 if (++n_ids >= SSH_MAX_IDENTITY_FILES)
2031 continue;
2032
djm@openbsd.org4e44a792015-09-24 06:15:11 +00002033 /*
2034 * If no certificates have been explicitly listed then try
2035 * to add the default certificate variant too.
2036 */
2037 if (options.num_certificate_files != 0)
2038 continue;
Damien Miller0a80ca12010-02-27 07:55:05 +11002039 xasprintf(&cp, "%s-cert", filename);
markus@openbsd.org5467fbc2018-07-11 18:53:29 +00002040 check_load(sshkey_load_public(cp, &public, NULL),
2041 filename, "pubkey");
Damien Miller0a80ca12010-02-27 07:55:05 +11002042 debug("identity file %s type %d", cp,
2043 public ? public->type : -1);
2044 if (public == NULL) {
Darren Tuckera627d422013-06-02 07:31:17 +10002045 free(cp);
Damien Miller0a80ca12010-02-27 07:55:05 +11002046 continue;
2047 }
markus@openbsd.org5467fbc2018-07-11 18:53:29 +00002048 if (!sshkey_is_cert(public)) {
Damien Miller0a80ca12010-02-27 07:55:05 +11002049 debug("%s: key %s type %s is not a certificate",
markus@openbsd.org5467fbc2018-07-11 18:53:29 +00002050 __func__, cp, sshkey_type(public));
2051 sshkey_free(public);
Darren Tuckera627d422013-06-02 07:31:17 +10002052 free(cp);
Damien Miller0a80ca12010-02-27 07:55:05 +11002053 continue;
2054 }
djm@openbsd.orgb4867e02016-12-06 07:48:01 +00002055 /* NB. leave filename pointing to private key */
2056 identity_files[n_ids] = xstrdup(filename);
Damien Miller0a80ca12010-02-27 07:55:05 +11002057 identity_keys[n_ids] = public;
djm@openbsd.org3eb7f102018-07-16 07:06:50 +00002058 identity_file_userprovided[n_ids] =
2059 options.identity_file_userprovided[i];
Damien Miller0a80ca12010-02-27 07:55:05 +11002060 n_ids++;
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00002061 }
djm@openbsd.org4e44a792015-09-24 06:15:11 +00002062
2063 if (options.num_certificate_files > SSH_MAX_CERTIFICATE_FILES)
2064 fatal("%s: too many certificates", __func__);
2065 for (i = 0; i < options.num_certificate_files; i++) {
2066 cp = tilde_expand_filename(options.certificate_files[i],
dtucker@openbsd.orge655ee02018-07-27 05:34:42 +00002067 getuid());
djm@openbsd.org9c935dd2018-06-01 03:33:53 +00002068 filename = percent_expand(cp,
2069 "d", pw->pw_dir,
2070 "h", host,
djm@openbsd.org03688892018-06-08 03:35:36 +00002071 "i", uidstr,
djm@openbsd.org9c935dd2018-06-01 03:33:53 +00002072 "l", thishost,
2073 "r", options.user,
2074 "u", pw->pw_name,
2075 (char *)NULL);
djm@openbsd.org4e44a792015-09-24 06:15:11 +00002076 free(cp);
2077
markus@openbsd.org5467fbc2018-07-11 18:53:29 +00002078 check_load(sshkey_load_public(filename, &public, NULL),
2079 filename, "certificate");
djm@openbsd.org4e44a792015-09-24 06:15:11 +00002080 debug("certificate file %s type %d", filename,
2081 public ? public->type : -1);
2082 free(options.certificate_files[i]);
2083 options.certificate_files[i] = NULL;
2084 if (public == NULL) {
2085 free(filename);
2086 continue;
2087 }
markus@openbsd.org5467fbc2018-07-11 18:53:29 +00002088 if (!sshkey_is_cert(public)) {
djm@openbsd.org4e44a792015-09-24 06:15:11 +00002089 debug("%s: key %s type %s is not a certificate",
markus@openbsd.org5467fbc2018-07-11 18:53:29 +00002090 __func__, filename, sshkey_type(public));
2091 sshkey_free(public);
djm@openbsd.org4e44a792015-09-24 06:15:11 +00002092 free(filename);
2093 continue;
2094 }
2095 certificate_files[n_certs] = filename;
2096 certificates[n_certs] = public;
djm@openbsd.org3eb7f102018-07-16 07:06:50 +00002097 certificate_file_userprovided[n_certs] =
2098 options.certificate_file_userprovided[i];
djm@openbsd.org4e44a792015-09-24 06:15:11 +00002099 ++n_certs;
2100 }
2101
Damien Miller0a80ca12010-02-27 07:55:05 +11002102 options.num_identity_files = n_ids;
2103 memcpy(options.identity_files, identity_files, sizeof(identity_files));
2104 memcpy(options.identity_keys, identity_keys, sizeof(identity_keys));
djm@openbsd.org3eb7f102018-07-16 07:06:50 +00002105 memcpy(options.identity_file_userprovided,
2106 identity_file_userprovided, sizeof(identity_file_userprovided));
Damien Miller0a80ca12010-02-27 07:55:05 +11002107
djm@openbsd.org4e44a792015-09-24 06:15:11 +00002108 options.num_certificate_files = n_certs;
2109 memcpy(options.certificate_files,
2110 certificate_files, sizeof(certificate_files));
2111 memcpy(options.certificates, certificates, sizeof(certificates));
djm@openbsd.org3eb7f102018-07-16 07:06:50 +00002112 memcpy(options.certificate_file_userprovided,
2113 certificate_file_userprovided,
2114 sizeof(certificate_file_userprovided));
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00002115}
Damien Miller857b02e2010-09-24 22:02:56 +10002116
2117static void
2118main_sigchld_handler(int sig)
2119{
2120 int save_errno = errno;
2121 pid_t pid;
2122 int status;
2123
2124 while ((pid = waitpid(-1, &status, WNOHANG)) > 0 ||
2125 (pid < 0 && errno == EINTR))
2126 ;
Damien Miller857b02e2010-09-24 22:02:56 +10002127 errno = save_errno;
2128}