blob: 1b022402d38b7b634f555877606b2ca0eb979f88 [file] [log] [blame]
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001/*
Damien Miller95def091999-11-25 00:26:21 +11002 * Author: Tatu Ylonen <ylo@cs.hut.fi>
3 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
4 * All rights reserved
Damien Miller95def091999-11-25 00:26:21 +11005 * Ssh client program. This program can be used to log into a remote machine.
6 * The software supports strong authentication, encryption, and forwarding
7 * of X11, TCP/IP, and authentication connections.
8 *
Damien Millere4340be2000-09-16 13:29:08 +11009 * As far as I am concerned, the code I have written for this software
10 * can be used freely for any purpose. Any derived versions of this
11 * software must be clearly marked as such, and if the derived work is
12 * incompatible with the protocol description in the RFC file, it must be
13 * called by a name other than "ssh" or "Secure Shell".
14 *
15 * Copyright (c) 1999 Niels Provos. All rights reserved.
16 *
17 * Modified to work with SSL by Niels Provos <provos@citi.umich.edu>
18 * in Canada (German citizen).
19 *
20 * Redistribution and use in source and binary forms, with or without
21 * modification, are permitted provided that the following conditions
22 * are met:
23 * 1. Redistributions of source code must retain the above copyright
24 * notice, this list of conditions and the following disclaimer.
25 * 2. Redistributions in binary form must reproduce the above copyright
26 * notice, this list of conditions and the following disclaimer in the
27 * documentation and/or other materials provided with the distribution.
28 *
29 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
30 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
31 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
32 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
33 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
34 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
35 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
36 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
37 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
38 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Damien Miller95def091999-11-25 00:26:21 +110039 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100040
41#include "includes.h"
Ben Lindstrom06b33aa2001-02-15 03:01:59 +000042RCSID("$OpenBSD: ssh.c,v 1.95 2001/02/11 12:59:25 markus Exp $");
Damien Millereba71ba2000-04-29 23:57:08 +100043
44#include <openssl/evp.h>
Damien Miller0bc1bd82000-11-13 22:57:25 +110045#include <openssl/err.h>
Damien Millerd4a8b7e1999-10-27 13:42:43 +100046
Damien Millerd4a8b7e1999-10-27 13:42:43 +100047#include "ssh.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000048#include "ssh1.h"
Damien Miller1383bd82000-04-06 12:32:37 +100049#include "ssh2.h"
50#include "compat.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000051#include "cipher.h"
52#include "xmalloc.h"
53#include "packet.h"
54#include "buffer.h"
55#include "uidswap.h"
Damien Millerb38eff82000-04-01 11:09:21 +100056#include "channels.h"
Damien Millereba71ba2000-04-29 23:57:08 +100057#include "key.h"
Damien Miller994cf142000-07-21 10:19:44 +100058#include "authfd.h"
Damien Millereba71ba2000-04-29 23:57:08 +100059#include "authfile.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000060#include "pathnames.h"
Ben Lindstrombf555ba2001-01-18 02:04:35 +000061#include "clientloop.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000062#include "log.h"
63#include "readconf.h"
64#include "sshconnect.h"
65#include "tildexpand.h"
Ben Lindstrom1e7d3062001-02-09 02:36:43 +000066#include "dispatch.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000067#include "misc.h"
Ben Lindstrom06b33aa2001-02-15 03:01:59 +000068#include "kex.h"
69#include "mac.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100070
Damien Miller3f905871999-11-15 17:10:57 +110071#ifdef HAVE___PROGNAME
72extern char *__progname;
Ben Lindstrom49a79c02000-11-17 03:47:20 +000073#else
74char *__progname;
75#endif
Damien Miller3f905871999-11-15 17:10:57 +110076
Damien Miller34132e52000-01-14 15:45:46 +110077/* Flag indicating whether IPv4 or IPv6. This can be set on the command line.
78 Default value is AF_UNSPEC means both IPv4 and IPv6. */
Damien Miller7d80e342000-01-19 14:36:49 +110079#ifdef IPV4_DEFAULT
80int IPv4or6 = AF_INET;
81#else
Damien Miller34132e52000-01-14 15:45:46 +110082int IPv4or6 = AF_UNSPEC;
Damien Miller7d80e342000-01-19 14:36:49 +110083#endif
Damien Miller34132e52000-01-14 15:45:46 +110084
Damien Miller95def091999-11-25 00:26:21 +110085/* Flag indicating whether debug mode is on. This can be set on the command line. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100086int debug_flag = 0;
87
Damien Miller78928792000-04-12 20:17:38 +100088/* Flag indicating whether a tty should be allocated */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100089int tty_flag = 0;
Ben Lindstrom4dccfa52000-12-28 16:40:05 +000090int no_tty_flag = 0;
91int force_tty_flag = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100092
Damien Miller1383bd82000-04-06 12:32:37 +100093/* don't exec a shell */
94int no_shell_flag = 0;
Damien Miller1383bd82000-04-06 12:32:37 +100095
Damien Miller5428f641999-11-25 11:54:57 +110096/*
97 * Flag indicating that nothing should be read from stdin. This can be set
98 * on the command line.
99 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000100int stdin_null_flag = 0;
101
Damien Miller5428f641999-11-25 11:54:57 +1100102/*
103 * Flag indicating that ssh should fork after authentication. This is useful
104 * so that the pasphrase can be entered manually, and then ssh goes to the
105 * background.
106 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000107int fork_after_authentication_flag = 0;
108
Damien Miller5428f641999-11-25 11:54:57 +1100109/*
110 * General data structure for command line options and options configurable
111 * in configuration files. See readconf.h.
112 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000113Options options;
114
Damien Miller5428f641999-11-25 11:54:57 +1100115/*
116 * Name of the host we are connecting to. This is the name given on the
117 * command line, or the HostName specified for the user-supplied name in a
118 * configuration file.
119 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000120char *host;
121
122/* socket address the host resolves to */
Damien Miller34132e52000-01-14 15:45:46 +1100123struct sockaddr_storage hostaddr;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000124
Damien Miller5428f641999-11-25 11:54:57 +1100125/*
126 * Flag to indicate that we have received a window change signal which has
127 * not yet been processed. This will cause a message indicating the new
128 * window size to be sent to the server a little later. This is volatile
129 * because this is updated in a signal handler.
130 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000131volatile int received_window_change_signal = 0;
132
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000133/* Flag indicating whether we have a valid host private key loaded. */
134int host_private_key_loaded = 0;
135
136/* Host private key. */
137RSA *host_private_key = NULL;
138
139/* Original real UID. */
140uid_t original_real_uid;
141
Damien Miller1383bd82000-04-06 12:32:37 +1000142/* command to be executed */
143Buffer command;
144
Damien Miller832562e2001-01-30 09:30:01 +1100145/* Should we execute a command or invoke a subsystem? */
146int subsystem_flag = 0;
147
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000148/* Prints a help message to the user. This function never returns. */
149
150void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000151usage(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000152{
Kevin Stevesec84dc12000-12-13 17:45:15 +0000153 fprintf(stderr, "Usage: %s [options] host [command]\n", __progname);
Damien Miller95def091999-11-25 00:26:21 +1100154 fprintf(stderr, "Options:\n");
155 fprintf(stderr, " -l user Log in using this user name.\n");
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000156 fprintf(stderr, " -n Redirect input from " _PATH_DEVNULL ".\n");
Damien Millerb1715dc2000-05-30 13:44:51 +1000157 fprintf(stderr, " -A Enable authentication agent forwarding.\n");
Damien Miller95def091999-11-25 00:26:21 +1100158 fprintf(stderr, " -a Disable authentication agent forwarding.\n");
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000159#ifdef AFS
Damien Miller95def091999-11-25 00:26:21 +1100160 fprintf(stderr, " -k Disable Kerberos ticket and AFS token forwarding.\n");
161#endif /* AFS */
Kevin Stevesef4eea92001-02-05 12:42:17 +0000162 fprintf(stderr, " -X Enable X11 connection forwarding.\n");
Damien Miller95def091999-11-25 00:26:21 +1100163 fprintf(stderr, " -x Disable X11 connection forwarding.\n");
164 fprintf(stderr, " -i file Identity for RSA authentication (default: ~/.ssh/identity).\n");
165 fprintf(stderr, " -t Tty; allocate a tty even if command is given.\n");
Damien Miller1383bd82000-04-06 12:32:37 +1000166 fprintf(stderr, " -T Do not allocate a tty.\n");
Damien Miller95def091999-11-25 00:26:21 +1100167 fprintf(stderr, " -v Verbose; display verbose debugging messages.\n");
Damien Millere4340be2000-09-16 13:29:08 +1100168 fprintf(stderr, " Multiple -v increases verbosity.\n");
Damien Miller95def091999-11-25 00:26:21 +1100169 fprintf(stderr, " -V Display version number only.\n");
170 fprintf(stderr, " -P Don't allocate a privileged port.\n");
171 fprintf(stderr, " -q Quiet; don't display any warning messages.\n");
172 fprintf(stderr, " -f Fork into background after authentication.\n");
173 fprintf(stderr, " -e char Set escape character; ``none'' = disable (default: ~).\n");
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000174
Damien Miller95def091999-11-25 00:26:21 +1100175 fprintf(stderr, " -c cipher Select encryption algorithm: "
176 "``3des'', "
177 "``blowfish''\n");
178 fprintf(stderr, " -p port Connect to this port. Server must be on the same port.\n");
179 fprintf(stderr, " -L listen-port:host:port Forward local port to remote address\n");
180 fprintf(stderr, " -R listen-port:host:port Forward remote port to local address\n");
Kevin Stevesec84dc12000-12-13 17:45:15 +0000181 fprintf(stderr, " These cause %s to listen for connections on a port, and\n", __progname);
Damien Miller95def091999-11-25 00:26:21 +1100182 fprintf(stderr, " forward them to the other side by connecting to host:port.\n");
183 fprintf(stderr, " -C Enable compression.\n");
Damien Miller1383bd82000-04-06 12:32:37 +1000184 fprintf(stderr, " -N Do not execute a shell or command.\n");
Damien Miller95def091999-11-25 00:26:21 +1100185 fprintf(stderr, " -g Allow remote hosts to connect to forwarded ports.\n");
Ben Lindstrom1e7d3062001-02-09 02:36:43 +0000186 fprintf(stderr, " -1 Force protocol version 1.\n");
187 fprintf(stderr, " -2 Force protocol version 2.\n");
Damien Miller34132e52000-01-14 15:45:46 +1100188 fprintf(stderr, " -4 Use IPv4 only.\n");
189 fprintf(stderr, " -6 Use IPv6 only.\n");
Damien Miller95def091999-11-25 00:26:21 +1100190 fprintf(stderr, " -o 'option' Process the option as if it was read from a configuration file.\n");
Damien Miller832562e2001-01-30 09:30:01 +1100191 fprintf(stderr, " -s Invoke command (mandatory) as SSH2 subsystem.\n");
Damien Miller95def091999-11-25 00:26:21 +1100192 exit(1);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000193}
194
Damien Miller95def091999-11-25 00:26:21 +1100195/*
196 * Connects to the given host using rsh (or prints an error message and exits
197 * if rsh is not available). This function never returns.
198 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000199void
Damien Miller95def091999-11-25 00:26:21 +1100200rsh_connect(char *host, char *user, Buffer * command)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000201{
Damien Miller95def091999-11-25 00:26:21 +1100202 char *args[10];
203 int i;
204
205 log("Using rsh. WARNING: Connection will not be encrypted.");
206 /* Build argument list for rsh. */
207 i = 0;
208 args[i++] = _PATH_RSH;
209 /* host may have to come after user on some systems */
210 args[i++] = host;
211 if (user) {
212 args[i++] = "-l";
213 args[i++] = user;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000214 }
Damien Miller95def091999-11-25 00:26:21 +1100215 if (buffer_len(command) > 0) {
216 buffer_append(command, "\0", 1);
217 args[i++] = buffer_ptr(command);
218 }
219 args[i++] = NULL;
220 if (debug_flag) {
221 for (i = 0; args[i]; i++) {
222 if (i != 0)
223 fprintf(stderr, " ");
224 fprintf(stderr, "%s", args[i]);
225 }
226 fprintf(stderr, "\n");
227 }
228 execv(_PATH_RSH, args);
229 perror(_PATH_RSH);
230 exit(1);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000231}
232
Damien Miller0bc1bd82000-11-13 22:57:25 +1100233int ssh_session(void);
234int ssh_session2(void);
235int guess_identity_file_type(const char *filename);
Damien Miller1383bd82000-04-06 12:32:37 +1000236
Damien Miller95def091999-11-25 00:26:21 +1100237/*
238 * Main program for the ssh client.
239 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000240int
241main(int ac, char **av)
242{
Damien Miller1383bd82000-04-06 12:32:37 +1000243 int i, opt, optind, exit_status, ok;
Damien Milleraae6c611999-12-06 11:47:28 +1100244 u_short fwd_port, fwd_host_port;
Damien Miller95def091999-11-25 00:26:21 +1100245 char *optarg, *cp, buf[256];
Damien Miller95def091999-11-25 00:26:21 +1100246 struct stat st;
247 struct passwd *pw, pwcopy;
Damien Miller1383bd82000-04-06 12:32:37 +1000248 int dummy;
Damien Miller95def091999-11-25 00:26:21 +1100249 uid_t original_effective_uid;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000250
Ben Lindstrom49a79c02000-11-17 03:47:20 +0000251 __progname = get_progname(av[0]);
Damien Millerf9b625c2000-07-09 22:42:32 +1000252 init_rng();
253
Damien Miller5428f641999-11-25 11:54:57 +1100254 /*
255 * Save the original real uid. It will be needed later (uid-swapping
256 * may clobber the real uid).
257 */
Damien Miller95def091999-11-25 00:26:21 +1100258 original_real_uid = getuid();
259 original_effective_uid = geteuid();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000260
Damien Miller05dd7952000-10-01 00:42:48 +1100261#ifdef HAVE_SETRLIMIT
Damien Miller95def091999-11-25 00:26:21 +1100262 /* If we are installed setuid root be careful to not drop core. */
263 if (original_real_uid != original_effective_uid) {
264 struct rlimit rlim;
265 rlim.rlim_cur = rlim.rlim_max = 0;
266 if (setrlimit(RLIMIT_CORE, &rlim) < 0)
267 fatal("setrlimit failed: %.100s", strerror(errno));
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000268 }
Damien Millerbac2d8a2000-09-05 16:13:06 +1100269#endif
Damien Miller5428f641999-11-25 11:54:57 +1100270 /*
271 * Use uid-swapping to give up root privileges for the duration of
272 * option processing. We will re-instantiate the rights when we are
273 * ready to create the privileged port, and will permanently drop
274 * them when the port has been created (actually, when the connection
275 * has been made, as we may need to create the port several times).
276 */
Damien Miller95def091999-11-25 00:26:21 +1100277 temporarily_use_uid(original_real_uid);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000278
Damien Miller5428f641999-11-25 11:54:57 +1100279 /*
280 * Set our umask to something reasonable, as some files are created
281 * with the default umask. This will make them world-readable but
282 * writable only by the owner, which is ok for all files for which we
283 * don't set the modes explicitly.
284 */
Damien Miller95def091999-11-25 00:26:21 +1100285 umask(022);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000286
Damien Miller95def091999-11-25 00:26:21 +1100287 /* Initialize option structure to indicate that no values have been set. */
288 initialize_options(&options);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000289
Damien Miller95def091999-11-25 00:26:21 +1100290 /* Parse command-line arguments. */
291 host = NULL;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000292
Damien Miller95def091999-11-25 00:26:21 +1100293 for (optind = 1; optind < ac; optind++) {
294 if (av[optind][0] != '-') {
295 if (host)
296 break;
297 if ((cp = strchr(av[optind], '@'))) {
Damien Miller4af51302000-04-16 11:18:38 +1000298 if(cp == av[optind])
299 usage();
Damien Miller95def091999-11-25 00:26:21 +1100300 options.user = av[optind];
301 *cp = '\0';
302 host = ++cp;
303 } else
304 host = av[optind];
305 continue;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000306 }
Damien Miller95def091999-11-25 00:26:21 +1100307 opt = av[optind][1];
308 if (!opt)
309 usage();
Ben Lindstrom06b33aa2001-02-15 03:01:59 +0000310 if (strchr("eilcmpLRo", opt)) { /* options with arguments */
Damien Miller95def091999-11-25 00:26:21 +1100311 optarg = av[optind] + 2;
312 if (strcmp(optarg, "") == 0) {
313 if (optind >= ac - 1)
314 usage();
315 optarg = av[++optind];
316 }
317 } else {
318 if (av[optind][2])
319 usage();
320 optarg = NULL;
321 }
322 switch (opt) {
Ben Lindstrom1e7d3062001-02-09 02:36:43 +0000323 case '1':
324 options.protocol = SSH_PROTO_1;
325 break;
Damien Miller4af51302000-04-16 11:18:38 +1000326 case '2':
327 options.protocol = SSH_PROTO_2;
328 break;
Damien Miller34132e52000-01-14 15:45:46 +1100329 case '4':
330 IPv4or6 = AF_INET;
331 break;
Damien Miller34132e52000-01-14 15:45:46 +1100332 case '6':
333 IPv4or6 = AF_INET6;
334 break;
Damien Miller95def091999-11-25 00:26:21 +1100335 case 'n':
336 stdin_null_flag = 1;
337 break;
Damien Miller95def091999-11-25 00:26:21 +1100338 case 'f':
339 fork_after_authentication_flag = 1;
340 stdin_null_flag = 1;
341 break;
Damien Miller95def091999-11-25 00:26:21 +1100342 case 'x':
343 options.forward_x11 = 0;
344 break;
Damien Miller95def091999-11-25 00:26:21 +1100345 case 'X':
346 options.forward_x11 = 1;
347 break;
Damien Miller95def091999-11-25 00:26:21 +1100348 case 'g':
349 options.gateway_ports = 1;
350 break;
Damien Miller95def091999-11-25 00:26:21 +1100351 case 'P':
352 options.use_privileged_port = 0;
353 break;
Damien Miller95def091999-11-25 00:26:21 +1100354 case 'a':
355 options.forward_agent = 0;
356 break;
Damien Millerb1715dc2000-05-30 13:44:51 +1000357 case 'A':
358 options.forward_agent = 1;
359 break;
Damien Miller95def091999-11-25 00:26:21 +1100360#ifdef AFS
361 case 'k':
362 options.kerberos_tgt_passing = 0;
363 options.afs_token_passing = 0;
364 break;
365#endif
366 case 'i':
367 if (stat(optarg, &st) < 0) {
368 fprintf(stderr, "Warning: Identity file %s does not exist.\n",
Damien Miller0bc1bd82000-11-13 22:57:25 +1100369 optarg);
Damien Miller95def091999-11-25 00:26:21 +1100370 break;
371 }
372 if (options.num_identity_files >= SSH_MAX_IDENTITY_FILES)
373 fatal("Too many identity files specified (max %d)",
Damien Miller0bc1bd82000-11-13 22:57:25 +1100374 SSH_MAX_IDENTITY_FILES);
375 options.identity_files[options.num_identity_files++] = xstrdup(optarg);
Damien Miller95def091999-11-25 00:26:21 +1100376 break;
Damien Miller95def091999-11-25 00:26:21 +1100377 case 't':
Ben Lindstrom4dccfa52000-12-28 16:40:05 +0000378 if (tty_flag)
379 force_tty_flag = 1;
Damien Miller95def091999-11-25 00:26:21 +1100380 tty_flag = 1;
381 break;
Damien Miller95def091999-11-25 00:26:21 +1100382 case 'v':
Damien Millere4340be2000-09-16 13:29:08 +1100383 if (0 == debug_flag) {
384 debug_flag = 1;
385 options.log_level = SYSLOG_LEVEL_DEBUG1;
386 } else if (options.log_level < SYSLOG_LEVEL_DEBUG3) {
387 options.log_level++;
388 break;
389 } else {
390 fatal("Too high debugging level.\n");
391 }
392 /* fallthrough */
Damien Miller95def091999-11-25 00:26:21 +1100393 case 'V':
Damien Miller78928792000-04-12 20:17:38 +1000394 fprintf(stderr, "SSH Version %s, protocol versions %d.%d/%d.%d.\n",
395 SSH_VERSION,
396 PROTOCOL_MAJOR_1, PROTOCOL_MINOR_1,
397 PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2);
Damien Miller1383bd82000-04-06 12:32:37 +1000398 fprintf(stderr, "Compiled with SSL (0x%8.8lx).\n", SSLeay());
Damien Miller95def091999-11-25 00:26:21 +1100399 if (opt == 'V')
400 exit(0);
Damien Miller95def091999-11-25 00:26:21 +1100401 break;
Damien Miller95def091999-11-25 00:26:21 +1100402 case 'q':
403 options.log_level = SYSLOG_LEVEL_QUIET;
404 break;
Damien Miller95def091999-11-25 00:26:21 +1100405 case 'e':
406 if (optarg[0] == '^' && optarg[2] == 0 &&
Ben Lindstrom46c16222000-12-22 01:43:59 +0000407 (u_char) optarg[1] >= 64 && (u_char) optarg[1] < 128)
408 options.escape_char = (u_char) optarg[1] & 31;
Damien Miller95def091999-11-25 00:26:21 +1100409 else if (strlen(optarg) == 1)
Ben Lindstrom46c16222000-12-22 01:43:59 +0000410 options.escape_char = (u_char) optarg[0];
Damien Miller95def091999-11-25 00:26:21 +1100411 else if (strcmp(optarg, "none") == 0)
412 options.escape_char = -2;
413 else {
414 fprintf(stderr, "Bad escape character '%s'.\n", optarg);
415 exit(1);
416 }
417 break;
Damien Miller95def091999-11-25 00:26:21 +1100418 case 'c':
Damien Millereba71ba2000-04-29 23:57:08 +1000419 if (ciphers_valid(optarg)) {
420 /* SSH2 only */
421 options.ciphers = xstrdup(optarg);
Damien Miller30c3d422000-05-09 11:02:59 +1000422 options.cipher = SSH_CIPHER_ILLEGAL;
Damien Millereba71ba2000-04-29 23:57:08 +1000423 } else {
424 /* SSH1 only */
Damien Millere39cacc2000-11-29 12:18:44 +1100425 options.cipher = cipher_number(optarg);
426 if (options.cipher == -1) {
Damien Millereba71ba2000-04-29 23:57:08 +1000427 fprintf(stderr, "Unknown cipher type '%s'\n", optarg);
428 exit(1);
429 }
Damien Millere39cacc2000-11-29 12:18:44 +1100430 if (options.cipher == SSH_CIPHER_3DES) {
431 options.ciphers = "3des-cbc";
432 } else if (options.cipher == SSH_CIPHER_BLOWFISH) {
433 options.ciphers = "blowfish-cbc";
434 } else {
435 options.ciphers = (char *)-1;
436 }
Damien Miller95def091999-11-25 00:26:21 +1100437 }
438 break;
Ben Lindstrom06b33aa2001-02-15 03:01:59 +0000439 case 'm':
440 if (mac_valid(optarg))
441 options.macs = xstrdup(optarg);
442 else {
443 fprintf(stderr, "Unknown mac type '%s'\n", optarg);
444 exit(1);
445 }
446 break;
Damien Miller95def091999-11-25 00:26:21 +1100447 case 'p':
448 options.port = atoi(optarg);
Damien Miller95def091999-11-25 00:26:21 +1100449 break;
Damien Miller95def091999-11-25 00:26:21 +1100450 case 'l':
451 options.user = optarg;
452 break;
Damien Miller95def091999-11-25 00:26:21 +1100453 case 'R':
Damien Miller34132e52000-01-14 15:45:46 +1100454 if (sscanf(optarg, "%hu/%255[^/]/%hu", &fwd_port, buf,
455 &fwd_host_port) != 3 &&
456 sscanf(optarg, "%hu:%255[^:]:%hu", &fwd_port, buf,
457 &fwd_host_port) != 3) {
Damien Miller95def091999-11-25 00:26:21 +1100458 fprintf(stderr, "Bad forwarding specification '%s'.\n", optarg);
459 usage();
460 /* NOTREACHED */
461 }
462 add_remote_forward(&options, fwd_port, buf, fwd_host_port);
463 break;
Damien Miller95def091999-11-25 00:26:21 +1100464 case 'L':
Damien Miller34132e52000-01-14 15:45:46 +1100465 if (sscanf(optarg, "%hu/%255[^/]/%hu", &fwd_port, buf,
466 &fwd_host_port) != 3 &&
467 sscanf(optarg, "%hu:%255[^:]:%hu", &fwd_port, buf,
468 &fwd_host_port) != 3) {
Damien Miller95def091999-11-25 00:26:21 +1100469 fprintf(stderr, "Bad forwarding specification '%s'.\n", optarg);
470 usage();
471 /* NOTREACHED */
472 }
473 add_local_forward(&options, fwd_port, buf, fwd_host_port);
474 break;
Damien Miller95def091999-11-25 00:26:21 +1100475 case 'C':
476 options.compression = 1;
477 break;
Damien Miller1383bd82000-04-06 12:32:37 +1000478 case 'N':
479 no_shell_flag = 1;
480 no_tty_flag = 1;
481 break;
Damien Miller1383bd82000-04-06 12:32:37 +1000482 case 'T':
483 no_tty_flag = 1;
484 break;
Damien Miller95def091999-11-25 00:26:21 +1100485 case 'o':
486 dummy = 1;
487 if (process_config_line(&options, host ? host : "", optarg,
488 "command-line", 0, &dummy) != 0)
489 exit(1);
490 break;
Damien Miller832562e2001-01-30 09:30:01 +1100491 case 's':
492 subsystem_flag = 1;
493 break;
Damien Miller95def091999-11-25 00:26:21 +1100494 default:
495 usage();
496 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000497 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000498
Damien Miller95def091999-11-25 00:26:21 +1100499 /* Check that we got a host name. */
500 if (!host)
501 usage();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000502
Damien Millercb5e44a2000-09-29 12:12:36 +1100503 SSLeay_add_all_algorithms();
Damien Miller0bc1bd82000-11-13 22:57:25 +1100504 ERR_load_crypto_strings();
Damien Millercb5e44a2000-09-29 12:12:36 +1100505
Damien Miller95def091999-11-25 00:26:21 +1100506 /* Initialize the command to execute on remote host. */
507 buffer_init(&command);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000508
Damien Miller5428f641999-11-25 11:54:57 +1100509 /*
510 * Save the command to execute on the remote host in a buffer. There
511 * is no limit on the length of the command, except by the maximum
512 * packet size. Also sets the tty flag if there is no command.
513 */
Damien Miller95def091999-11-25 00:26:21 +1100514 if (optind == ac) {
515 /* No command specified - execute shell on a tty. */
516 tty_flag = 1;
Damien Miller832562e2001-01-30 09:30:01 +1100517 if (subsystem_flag) {
518 fprintf(stderr, "You must specify a subsystem to invoke.");
519 usage();
520 }
Damien Miller95def091999-11-25 00:26:21 +1100521 } else {
522 /* A command has been specified. Store it into the
523 buffer. */
524 for (i = optind; i < ac; i++) {
525 if (i > optind)
526 buffer_append(&command, " ", 1);
527 buffer_append(&command, av[i], strlen(av[i]));
528 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000529 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000530
Damien Miller95def091999-11-25 00:26:21 +1100531 /* Cannot fork to background if no command. */
Damien Millercaf6dd62000-08-29 11:33:50 +1100532 if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag)
Damien Miller95def091999-11-25 00:26:21 +1100533 fatal("Cannot fork into background without a command to execute.");
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000534
Damien Miller95def091999-11-25 00:26:21 +1100535 /* Allocate a tty by default if no command specified. */
536 if (buffer_len(&command) == 0)
537 tty_flag = 1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000538
Ben Lindstromc72745a2000-12-02 19:03:54 +0000539 /* Force no tty*/
540 if (no_tty_flag)
541 tty_flag = 0;
Damien Miller95def091999-11-25 00:26:21 +1100542 /* Do not allocate a tty if stdin is not a tty. */
Ben Lindstrom4dccfa52000-12-28 16:40:05 +0000543 if (!isatty(fileno(stdin)) && !force_tty_flag) {
Damien Miller95def091999-11-25 00:26:21 +1100544 if (tty_flag)
Ben Lindstrombf555ba2001-01-18 02:04:35 +0000545 log("Pseudo-terminal will not be allocated because stdin is not a terminal.\n");
Damien Miller95def091999-11-25 00:26:21 +1100546 tty_flag = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000547 }
Damien Miller1383bd82000-04-06 12:32:37 +1000548
Damien Miller95def091999-11-25 00:26:21 +1100549 /* Get user data. */
550 pw = getpwuid(original_real_uid);
551 if (!pw) {
Ben Lindstrombf555ba2001-01-18 02:04:35 +0000552 log("You don't exist, go away!\n");
Damien Miller95def091999-11-25 00:26:21 +1100553 exit(1);
554 }
555 /* Take a copy of the returned structure. */
556 memset(&pwcopy, 0, sizeof(pwcopy));
557 pwcopy.pw_name = xstrdup(pw->pw_name);
558 pwcopy.pw_passwd = xstrdup(pw->pw_passwd);
559 pwcopy.pw_uid = pw->pw_uid;
560 pwcopy.pw_gid = pw->pw_gid;
Damien Millerad833b32000-08-23 10:46:23 +1000561#ifdef HAVE_PW_CLASS_IN_PASSWD
562 pwcopy.pw_class = xstrdup(pw->pw_class);
563#endif
Damien Miller95def091999-11-25 00:26:21 +1100564 pwcopy.pw_dir = xstrdup(pw->pw_dir);
565 pwcopy.pw_shell = xstrdup(pw->pw_shell);
566 pw = &pwcopy;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000567
Damien Miller95def091999-11-25 00:26:21 +1100568 /* Initialize "log" output. Since we are the client all output
569 actually goes to the terminal. */
570 log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 0);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000571
Damien Miller95def091999-11-25 00:26:21 +1100572 /* Read per-user configuration file. */
Ben Lindstrom226cfa02001-01-22 05:34:40 +0000573 snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, _PATH_SSH_USER_CONFFILE);
Damien Miller95def091999-11-25 00:26:21 +1100574 read_config_file(buf, host, &options);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000575
Damien Miller95def091999-11-25 00:26:21 +1100576 /* Read systemwide configuration file. */
Ben Lindstrom226cfa02001-01-22 05:34:40 +0000577 read_config_file(_PATH_HOST_CONFIG_FILE, host, &options);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000578
Damien Miller95def091999-11-25 00:26:21 +1100579 /* Fill configuration defaults. */
580 fill_default_options(&options);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000581
Damien Miller95def091999-11-25 00:26:21 +1100582 /* reinit */
583 log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 0);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000584
Damien Miller95def091999-11-25 00:26:21 +1100585 if (options.user == NULL)
586 options.user = xstrdup(pw->pw_name);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000587
Damien Miller95def091999-11-25 00:26:21 +1100588 if (options.hostname != NULL)
589 host = options.hostname;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000590
Damien Miller95def091999-11-25 00:26:21 +1100591 /* Disable rhosts authentication if not running as root. */
Damien Millerbac2d8a2000-09-05 16:13:06 +1100592#ifdef HAVE_CYGWIN
593 /* Ignore uid if running under Windows */
594 if (!options.use_privileged_port) {
595#else
Damien Miller95def091999-11-25 00:26:21 +1100596 if (original_effective_uid != 0 || !options.use_privileged_port) {
Damien Millerbac2d8a2000-09-05 16:13:06 +1100597#endif
Kevin Stevesfcec7f82000-12-15 19:55:48 +0000598 debug("Rhosts Authentication disabled, "
599 "originating port will not be trusted.");
Damien Miller95def091999-11-25 00:26:21 +1100600 options.rhosts_authentication = 0;
Damien Miller95def091999-11-25 00:26:21 +1100601 }
Damien Miller5428f641999-11-25 11:54:57 +1100602 /*
603 * If using rsh has been selected, exec it now (without trying
604 * anything else). Note that we must release privileges first.
605 */
Damien Miller95def091999-11-25 00:26:21 +1100606 if (options.use_rsh) {
Damien Miller5428f641999-11-25 11:54:57 +1100607 /*
608 * Restore our superuser privileges. This must be done
609 * before permanently setting the uid.
610 */
Damien Miller95def091999-11-25 00:26:21 +1100611 restore_uid();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000612
Damien Miller95def091999-11-25 00:26:21 +1100613 /* Switch to the original uid permanently. */
614 permanently_set_uid(original_real_uid);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000615
Damien Miller95def091999-11-25 00:26:21 +1100616 /* Execute rsh. */
617 rsh_connect(host, options.user, &command);
618 fatal("rsh_connect returned");
619 }
620 /* Restore our superuser privileges. */
621 restore_uid();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000622
Kevin Stevesfcec7f82000-12-15 19:55:48 +0000623 /* Open a connection to the remote host. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000624
Damien Miller95def091999-11-25 00:26:21 +1100625 ok = ssh_connect(host, &hostaddr, options.port,
Kevin Stevesfcec7f82000-12-15 19:55:48 +0000626 options.connection_attempts,
627 original_effective_uid != 0 || !options.use_privileged_port,
628 original_real_uid,
629 options.proxy_command);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000630
Damien Miller5428f641999-11-25 11:54:57 +1100631 /*
632 * If we successfully made the connection, load the host private key
633 * in case we will need it later for combined rsa-rhosts
634 * authentication. This must be done before releasing extra
635 * privileges, because the file is only readable by root.
636 */
Damien Millereba71ba2000-04-29 23:57:08 +1000637 if (ok && (options.protocol & SSH_PROTO_1)) {
638 Key k;
Damien Miller95def091999-11-25 00:26:21 +1100639 host_private_key = RSA_new();
Damien Miller0bc1bd82000-11-13 22:57:25 +1100640 k.type = KEY_RSA1;
Damien Millereba71ba2000-04-29 23:57:08 +1000641 k.rsa = host_private_key;
Ben Lindstrom226cfa02001-01-22 05:34:40 +0000642 if (load_private_key(_PATH_HOST_KEY_FILE, "", &k, NULL))
Damien Miller95def091999-11-25 00:26:21 +1100643 host_private_key_loaded = 1;
644 }
Damien Miller5428f641999-11-25 11:54:57 +1100645 /*
646 * Get rid of any extra privileges that we may have. We will no
647 * longer need them. Also, extra privileges could make it very hard
648 * to read identity files and other non-world-readable files from the
649 * user's home directory if it happens to be on a NFS volume where
650 * root is mapped to nobody.
651 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000652
Damien Miller5428f641999-11-25 11:54:57 +1100653 /*
654 * Note that some legacy systems need to postpone the following call
655 * to permanently_set_uid() until the private hostkey is destroyed
656 * with RSA_free(). Otherwise the calling user could ptrace() the
657 * process, read the private hostkey and impersonate the host.
658 * OpenBSD does not allow ptracing of setuid processes.
659 */
Damien Miller95def091999-11-25 00:26:21 +1100660 permanently_set_uid(original_real_uid);
661
Damien Miller5428f641999-11-25 11:54:57 +1100662 /*
663 * Now that we are back to our own permissions, create ~/.ssh
664 * directory if it doesn\'t already exist.
665 */
Ben Lindstrom226cfa02001-01-22 05:34:40 +0000666 snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, _PATH_SSH_USER_DIR);
Damien Miller95def091999-11-25 00:26:21 +1100667 if (stat(buf, &st) < 0)
Damien Millerbe484b52000-07-15 14:14:16 +1000668 if (mkdir(buf, 0700) < 0)
Damien Miller95def091999-11-25 00:26:21 +1100669 error("Could not create directory '%.200s'.", buf);
670
671 /* Check if the connection failed, and try "rsh" if appropriate. */
672 if (!ok) {
673 if (options.port != 0)
Damien Milleraae6c611999-12-06 11:47:28 +1100674 log("Secure connection to %.100s on port %hu refused%.100s.",
Damien Miller95def091999-11-25 00:26:21 +1100675 host, options.port,
676 options.fallback_to_rsh ? "; reverting to insecure method" : "");
677 else
678 log("Secure connection to %.100s refused%.100s.", host,
679 options.fallback_to_rsh ? "; reverting to insecure method" : "");
680
681 if (options.fallback_to_rsh) {
682 rsh_connect(host, options.user, &command);
683 fatal("rsh_connect returned");
684 }
685 exit(1);
686 }
Damien Miller0bc1bd82000-11-13 22:57:25 +1100687 /* Expand ~ in options.identity_files, known host file names. */
Damien Millereba71ba2000-04-29 23:57:08 +1000688 /* XXX mem-leaks */
Damien Miller0bc1bd82000-11-13 22:57:25 +1100689 for (i = 0; i < options.num_identity_files; i++) {
Damien Miller95def091999-11-25 00:26:21 +1100690 options.identity_files[i] =
Damien Miller0bc1bd82000-11-13 22:57:25 +1100691 tilde_expand_filename(options.identity_files[i], original_real_uid);
692 options.identity_files_type[i] = guess_identity_file_type(options.identity_files[i]);
693 debug("identity file %s type %d", options.identity_files[i],
694 options.identity_files_type[i]);
695 }
696 options.system_hostfile =
697 tilde_expand_filename(options.system_hostfile, original_real_uid);
698 options.user_hostfile =
699 tilde_expand_filename(options.user_hostfile, original_real_uid);
700 options.system_hostfile2 =
701 tilde_expand_filename(options.system_hostfile2, original_real_uid);
702 options.user_hostfile2 =
703 tilde_expand_filename(options.user_hostfile2, original_real_uid);
Damien Miller95def091999-11-25 00:26:21 +1100704
705 /* Log into the remote system. This never returns if the login fails. */
706 ssh_login(host_private_key_loaded, host_private_key,
Damien Miller34132e52000-01-14 15:45:46 +1100707 host, (struct sockaddr *)&hostaddr, original_real_uid);
Damien Miller95def091999-11-25 00:26:21 +1100708
709 /* We no longer need the host private key. Clear it now. */
710 if (host_private_key_loaded)
711 RSA_free(host_private_key); /* Destroys contents safely */
712
Damien Miller1383bd82000-04-06 12:32:37 +1000713 exit_status = compat20 ? ssh_session2() : ssh_session();
714 packet_close();
715 return exit_status;
716}
717
Damien Millerbd483e72000-04-30 10:00:53 +1000718void
719x11_get_proto(char *proto, int proto_len, char *data, int data_len)
720{
721 char line[512];
722 FILE *f;
723 int got_data = 0, i;
724
Damien Millerd3a18572000-06-07 19:55:44 +1000725 if (options.xauth_location) {
726 /* Try to get Xauthority information for the display. */
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000727 snprintf(line, sizeof line, "%.100s list %.200s 2>" _PATH_DEVNULL,
Damien Millerd3a18572000-06-07 19:55:44 +1000728 options.xauth_location, getenv("DISPLAY"));
729 f = popen(line, "r");
730 if (f && fgets(line, sizeof(line), f) &&
731 sscanf(line, "%*s %s %s", proto, data) == 2)
732 got_data = 1;
733 if (f)
734 pclose(f);
735 }
Damien Millerbd483e72000-04-30 10:00:53 +1000736 /*
737 * If we didn't get authentication data, just make up some
738 * data. The forwarding code will check the validity of the
739 * response anyway, and substitute this data. The X11
740 * server, however, will ignore this fake data and use
741 * whatever authentication mechanisms it was using otherwise
742 * for the local connection.
743 */
744 if (!got_data) {
745 u_int32_t rand = 0;
746
747 strlcpy(proto, "MIT-MAGIC-COOKIE-1", proto_len);
748 for (i = 0; i < 16; i++) {
749 if (i % 4 == 0)
750 rand = arc4random();
751 snprintf(data + 2 * i, data_len - 2 * i, "%02x", rand & 0xff);
752 rand >>= 8;
753 }
754 }
755}
756
Damien Miller0bc1bd82000-11-13 22:57:25 +1100757void
758ssh_init_forwarding(void)
759{
Kevin Steves12057502001-02-05 14:54:34 +0000760 int success = 0;
Damien Miller0bc1bd82000-11-13 22:57:25 +1100761 int i;
Kevin Steves12057502001-02-05 14:54:34 +0000762
Damien Miller0bc1bd82000-11-13 22:57:25 +1100763 /* Initiate local TCP/IP port forwardings. */
764 for (i = 0; i < options.num_local_forwards; i++) {
765 debug("Connections to local port %d forwarded to remote address %.200s:%d",
766 options.local_forwards[i].port,
767 options.local_forwards[i].host,
768 options.local_forwards[i].host_port);
Kevin Steves12057502001-02-05 14:54:34 +0000769 success += channel_request_local_forwarding(
Damien Miller0bc1bd82000-11-13 22:57:25 +1100770 options.local_forwards[i].port,
771 options.local_forwards[i].host,
772 options.local_forwards[i].host_port,
773 options.gateway_ports);
774 }
Kevin Steves12057502001-02-05 14:54:34 +0000775 if (i > 0 && success == 0)
776 error("Could not request local forwarding.");
Damien Miller0bc1bd82000-11-13 22:57:25 +1100777
778 /* Initiate remote TCP/IP port forwardings. */
779 for (i = 0; i < options.num_remote_forwards; i++) {
780 debug("Connections to remote port %d forwarded to local address %.200s:%d",
781 options.remote_forwards[i].port,
782 options.remote_forwards[i].host,
783 options.remote_forwards[i].host_port);
784 channel_request_remote_forwarding(
785 options.remote_forwards[i].port,
786 options.remote_forwards[i].host,
787 options.remote_forwards[i].host_port);
788 }
789}
790
791void
792check_agent_present(void)
793{
794 if (options.forward_agent) {
795 /* Clear agent forwarding if we don\'t have an agent. */
796 int authfd = ssh_get_authentication_socket();
797 if (authfd < 0)
798 options.forward_agent = 0;
799 else
800 ssh_close_authentication_socket(authfd);
801 }
802}
803
Damien Miller1383bd82000-04-06 12:32:37 +1000804int
805ssh_session(void)
806{
807 int type;
Damien Miller1383bd82000-04-06 12:32:37 +1000808 int plen;
809 int interactive = 0;
810 int have_tty = 0;
811 struct winsize ws;
Damien Miller1383bd82000-04-06 12:32:37 +1000812 char *cp;
813
Damien Miller95def091999-11-25 00:26:21 +1100814 /* Enable compression if requested. */
815 if (options.compression) {
816 debug("Requesting compression at level %d.", options.compression_level);
817
818 if (options.compression_level < 1 || options.compression_level > 9)
819 fatal("Compression level must be from 1 (fast) to 9 (slow, best).");
820
821 /* Send the request. */
822 packet_start(SSH_CMSG_REQUEST_COMPRESSION);
823 packet_put_int(options.compression_level);
824 packet_send();
825 packet_write_wait();
826 type = packet_read(&plen);
827 if (type == SSH_SMSG_SUCCESS)
828 packet_start_compression(options.compression_level);
829 else if (type == SSH_SMSG_FAILURE)
830 log("Warning: Remote host refused compression.");
831 else
832 packet_disconnect("Protocol error waiting for compression response.");
833 }
834 /* Allocate a pseudo tty if appropriate. */
835 if (tty_flag) {
836 debug("Requesting pty.");
837
838 /* Start the packet. */
839 packet_start(SSH_CMSG_REQUEST_PTY);
840
841 /* Store TERM in the packet. There is no limit on the
842 length of the string. */
843 cp = getenv("TERM");
844 if (!cp)
845 cp = "";
846 packet_put_string(cp, strlen(cp));
847
848 /* Store window size in the packet. */
849 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
850 memset(&ws, 0, sizeof(ws));
851 packet_put_int(ws.ws_row);
852 packet_put_int(ws.ws_col);
853 packet_put_int(ws.ws_xpixel);
854 packet_put_int(ws.ws_ypixel);
855
856 /* Store tty modes in the packet. */
857 tty_make_modes(fileno(stdin));
858
859 /* Send the packet, and wait for it to leave. */
860 packet_send();
861 packet_write_wait();
862
863 /* Read response from the server. */
864 type = packet_read(&plen);
Damien Miller450a7a12000-03-26 13:04:51 +1000865 if (type == SSH_SMSG_SUCCESS) {
Damien Miller95def091999-11-25 00:26:21 +1100866 interactive = 1;
Damien Miller1383bd82000-04-06 12:32:37 +1000867 have_tty = 1;
Damien Miller450a7a12000-03-26 13:04:51 +1000868 } else if (type == SSH_SMSG_FAILURE)
Damien Miller95def091999-11-25 00:26:21 +1100869 log("Warning: Remote host failed or refused to allocate a pseudo tty.");
870 else
871 packet_disconnect("Protocol error waiting for pty request response.");
872 }
873 /* Request X11 forwarding if enabled and DISPLAY is set. */
874 if (options.forward_x11 && getenv("DISPLAY") != NULL) {
Damien Millerbd483e72000-04-30 10:00:53 +1000875 char proto[512], data[512];
876 /* Get reasonable local authentication information. */
877 x11_get_proto(proto, sizeof proto, data, sizeof data);
878 /* Request forwarding with authentication spoofing. */
Damien Miller95def091999-11-25 00:26:21 +1100879 debug("Requesting X11 forwarding with authentication spoofing.");
Damien Millerbd483e72000-04-30 10:00:53 +1000880 x11_request_forwarding_with_spoofing(0, proto, data);
Damien Miller95def091999-11-25 00:26:21 +1100881
882 /* Read response from the server. */
883 type = packet_read(&plen);
884 if (type == SSH_SMSG_SUCCESS) {
Damien Miller95def091999-11-25 00:26:21 +1100885 interactive = 1;
Damien Millerbd483e72000-04-30 10:00:53 +1000886 } else if (type == SSH_SMSG_FAILURE) {
Damien Miller95def091999-11-25 00:26:21 +1100887 log("Warning: Remote host denied X11 forwarding.");
Damien Millerbd483e72000-04-30 10:00:53 +1000888 } else {
Damien Miller95def091999-11-25 00:26:21 +1100889 packet_disconnect("Protocol error waiting for X11 forwarding");
Damien Millerbd483e72000-04-30 10:00:53 +1000890 }
Damien Miller95def091999-11-25 00:26:21 +1100891 }
892 /* Tell the packet module whether this is an interactive session. */
Ben Lindstrombf555ba2001-01-18 02:04:35 +0000893 packet_set_interactive(interactive);
Damien Miller95def091999-11-25 00:26:21 +1100894
895 /* Request authentication agent forwarding if appropriate. */
Damien Miller0bc1bd82000-11-13 22:57:25 +1100896 check_agent_present();
897
Damien Miller95def091999-11-25 00:26:21 +1100898 if (options.forward_agent) {
899 debug("Requesting authentication agent forwarding.");
900 auth_request_forwarding();
901
902 /* Read response from the server. */
903 type = packet_read(&plen);
904 packet_integrity_check(plen, 0, type);
905 if (type != SSH_SMSG_SUCCESS)
906 log("Warning: Remote host denied authentication agent forwarding.");
907 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000908
Damien Miller0bc1bd82000-11-13 22:57:25 +1100909 /* Initiate port forwardings. */
910 ssh_init_forwarding();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000911
Damien Miller5428f641999-11-25 11:54:57 +1100912 /* If requested, let ssh continue in the background. */
Damien Miller4af51302000-04-16 11:18:38 +1000913 if (fork_after_authentication_flag)
Damien Miller5428f641999-11-25 11:54:57 +1100914 if (daemon(1, 1) < 0)
915 fatal("daemon() failed: %.200s", strerror(errno));
916
917 /*
918 * If a command was specified on the command line, execute the
919 * command now. Otherwise request the server to start a shell.
920 */
Damien Miller95def091999-11-25 00:26:21 +1100921 if (buffer_len(&command) > 0) {
922 int len = buffer_len(&command);
923 if (len > 900)
924 len = 900;
925 debug("Sending command: %.*s", len, buffer_ptr(&command));
926 packet_start(SSH_CMSG_EXEC_CMD);
927 packet_put_string(buffer_ptr(&command), buffer_len(&command));
928 packet_send();
929 packet_write_wait();
930 } else {
931 debug("Requesting shell.");
932 packet_start(SSH_CMSG_EXEC_SHELL);
933 packet_send();
934 packet_write_wait();
935 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000936
Damien Miller95def091999-11-25 00:26:21 +1100937 /* Enter the interactive session. */
Damien Millerad833b32000-08-23 10:46:23 +1000938 return client_loop(have_tty, tty_flag ? options.escape_char : -1, 0);
Damien Miller1383bd82000-04-06 12:32:37 +1000939}
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000940
Damien Miller1383bd82000-04-06 12:32:37 +1000941void
Ben Lindstrom1e7d3062001-02-09 02:36:43 +0000942client_subsystem_reply(int type, int plen, void *ctxt)
943{
944 int id, len;
945
946 id = packet_get_int();
947 len = buffer_len(&command);
948 len = MAX(len, 900);
949 packet_done();
950 if (type == SSH2_MSG_CHANNEL_FAILURE)
951 fatal("Request for subsystem '%.*s' failed on channel %d",
952 len, buffer_ptr(&command), id);
953}
954
955void
Damien Miller0bc1bd82000-11-13 22:57:25 +1100956ssh_session2_callback(int id, void *arg)
Damien Miller1383bd82000-04-06 12:32:37 +1000957{
958 int len;
Ben Lindstrombf555ba2001-01-18 02:04:35 +0000959 int interactive = 0;
960
Kevin Stevesadf74cd2001-02-05 14:22:50 +0000961 debug("client_init id %d arg %ld", id, (long)arg);
Damien Miller1383bd82000-04-06 12:32:37 +1000962
963 if (no_shell_flag)
964 goto done;
965
966 if (tty_flag) {
967 struct winsize ws;
968 char *cp;
969 cp = getenv("TERM");
970 if (!cp)
971 cp = "";
972 /* Store window size in the packet. */
973 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
974 memset(&ws, 0, sizeof(ws));
975
976 channel_request_start(id, "pty-req", 0);
977 packet_put_cstring(cp);
978 packet_put_int(ws.ws_col);
979 packet_put_int(ws.ws_row);
980 packet_put_int(ws.ws_xpixel);
981 packet_put_int(ws.ws_ypixel);
982 packet_put_cstring(""); /* XXX: encode terminal modes */
983 packet_send();
Ben Lindstrombf555ba2001-01-18 02:04:35 +0000984 interactive = 1;
Damien Miller1383bd82000-04-06 12:32:37 +1000985 /* XXX wait for reply */
986 }
Damien Millerbd483e72000-04-30 10:00:53 +1000987 if (options.forward_x11 &&
988 getenv("DISPLAY") != NULL) {
989 char proto[512], data[512];
990 /* Get reasonable local authentication information. */
991 x11_get_proto(proto, sizeof proto, data, sizeof data);
992 /* Request forwarding with authentication spoofing. */
993 debug("Requesting X11 forwarding with authentication spoofing.");
994 x11_request_forwarding_with_spoofing(id, proto, data);
Ben Lindstrombf555ba2001-01-18 02:04:35 +0000995 interactive = 1;
Damien Millerbd483e72000-04-30 10:00:53 +1000996 /* XXX wait for reply */
997 }
998
Damien Miller0bc1bd82000-11-13 22:57:25 +1100999 check_agent_present();
1000 if (options.forward_agent) {
1001 debug("Requesting authentication agent forwarding.");
1002 channel_request_start(id, "auth-agent-req@openssh.com", 0);
1003 packet_send();
1004 }
1005
Damien Miller1383bd82000-04-06 12:32:37 +10001006 len = buffer_len(&command);
1007 if (len > 0) {
1008 if (len > 900)
1009 len = 900;
Damien Miller832562e2001-01-30 09:30:01 +11001010 if (subsystem_flag) {
1011 debug("Sending subsystem: %.*s", len, buffer_ptr(&command));
Ben Lindstrom1e7d3062001-02-09 02:36:43 +00001012 channel_request_start(id, "subsystem", /*want reply*/ 1);
1013 /* register callback for reply */
1014 /* XXX we asume that client_loop has already been called */
1015 dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &client_subsystem_reply);
1016 dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &client_subsystem_reply);
Damien Miller832562e2001-01-30 09:30:01 +11001017 } else {
1018 debug("Sending command: %.*s", len, buffer_ptr(&command));
1019 channel_request_start(id, "exec", 0);
1020 }
Damien Miller1383bd82000-04-06 12:32:37 +10001021 packet_put_string(buffer_ptr(&command), len);
1022 packet_send();
1023 } else {
1024 channel_request(id, "shell", 0);
1025 }
1026 /* channel_callback(id, SSH2_MSG_OPEN_CONFIGMATION, client_init, 0); */
Ben Lindstrom1e7d3062001-02-09 02:36:43 +00001027
Damien Miller1383bd82000-04-06 12:32:37 +10001028done:
1029 /* register different callback, etc. XXX */
Ben Lindstrombf555ba2001-01-18 02:04:35 +00001030 packet_set_interactive(interactive);
Damien Miller1383bd82000-04-06 12:32:37 +10001031}
1032
1033int
1034ssh_session2(void)
1035{
1036 int window, packetmax, id;
Damien Millerad833b32000-08-23 10:46:23 +10001037 int in, out, err;
1038
Damien Millercaf6dd62000-08-29 11:33:50 +11001039 if (stdin_null_flag) {
Ben Lindstrom31ca54a2001-02-09 02:11:24 +00001040 in = open(_PATH_DEVNULL, O_RDONLY);
Damien Millercaf6dd62000-08-29 11:33:50 +11001041 } else {
1042 in = dup(STDIN_FILENO);
1043 }
1044 out = dup(STDOUT_FILENO);
1045 err = dup(STDERR_FILENO);
1046
1047 if (in < 0 || out < 0 || err < 0)
1048 fatal("dup() in/out/err failed");
1049
Damien Miller69b69aa2000-10-28 14:19:58 +11001050 /* enable nonblocking unless tty */
1051 if (!isatty(in))
1052 set_nonblock(in);
1053 if (!isatty(out))
1054 set_nonblock(out);
1055 if (!isatty(err))
1056 set_nonblock(err);
1057
Damien Miller0bc1bd82000-11-13 22:57:25 +11001058 /* XXX should be pre-session */
1059 ssh_init_forwarding();
Kevin Stevesef4eea92001-02-05 12:42:17 +00001060
Damien Millerad833b32000-08-23 10:46:23 +10001061 /* If requested, let ssh continue in the background. */
1062 if (fork_after_authentication_flag)
1063 if (daemon(1, 1) < 0)
1064 fatal("daemon() failed: %.200s", strerror(errno));
1065
Damien Millere4340be2000-09-16 13:29:08 +11001066 window = CHAN_SES_WINDOW_DEFAULT;
1067 packetmax = CHAN_SES_PACKET_DEFAULT;
1068 if (!tty_flag) {
Damien Miller1383bd82000-04-06 12:32:37 +10001069 window *= 2;
Damien Millere4340be2000-09-16 13:29:08 +11001070 packetmax *=2;
Damien Miller1383bd82000-04-06 12:32:37 +10001071 }
Damien Miller1383bd82000-04-06 12:32:37 +10001072 id = channel_new(
1073 "session", SSH_CHANNEL_OPENING, in, out, err,
Damien Millere4340be2000-09-16 13:29:08 +11001074 window, packetmax, CHAN_EXTENDED_WRITE,
Damien Miller69b69aa2000-10-28 14:19:58 +11001075 xstrdup("client-session"), /*nonblock*/0);
Damien Miller1383bd82000-04-06 12:32:37 +10001076
Damien Miller1383bd82000-04-06 12:32:37 +10001077 channel_open(id);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001078 channel_register_callback(id, SSH2_MSG_CHANNEL_OPEN_CONFIRMATION,
1079 ssh_session2_callback, (void *)0);
Damien Miller1383bd82000-04-06 12:32:37 +10001080
Damien Millerad833b32000-08-23 10:46:23 +10001081 return client_loop(tty_flag, tty_flag ? options.escape_char : -1, id);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001082}
Damien Miller0bc1bd82000-11-13 22:57:25 +11001083
1084int
1085guess_identity_file_type(const char *filename)
1086{
1087 struct stat st;
1088 Key *public;
1089 int type = KEY_RSA1; /* default */
1090
1091 if (stat(filename, &st) < 0) {
Ben Lindstrom14920292000-11-21 21:24:55 +00001092 /* ignore this key */
Damien Miller0bc1bd82000-11-13 22:57:25 +11001093 return KEY_UNSPEC;
1094 }
1095 public = key_new(type);
1096 if (!load_public_key(filename, public, NULL)) {
1097 /* ok, so we will assume this is 'some' key */
1098 type = KEY_UNSPEC;
1099 }
1100 key_free(public);
1101 return type;
1102}