blob: 74a2b75ac459ab999012b2ab10bf730aa6a54a54 [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 Lindstrom266dfdf2001-03-09 00:12:22 +000042RCSID("$OpenBSD: ssh.c,v 1.104 2001/03/08 21:42:32 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");
Ben Lindstrom0ab2a012001-03-05 06:45:21 +0000164 fprintf(stderr, " -i file Identity for public key authentication "
165 "(default: ~/.ssh/identity)\n");
Damien Miller95def091999-11-25 00:26:21 +1100166 fprintf(stderr, " -t Tty; allocate a tty even if command is given.\n");
Damien Miller1383bd82000-04-06 12:32:37 +1000167 fprintf(stderr, " -T Do not allocate a tty.\n");
Damien Miller95def091999-11-25 00:26:21 +1100168 fprintf(stderr, " -v Verbose; display verbose debugging messages.\n");
Damien Millere4340be2000-09-16 13:29:08 +1100169 fprintf(stderr, " Multiple -v increases verbosity.\n");
Damien Miller95def091999-11-25 00:26:21 +1100170 fprintf(stderr, " -V Display version number only.\n");
171 fprintf(stderr, " -P Don't allocate a privileged port.\n");
172 fprintf(stderr, " -q Quiet; don't display any warning messages.\n");
173 fprintf(stderr, " -f Fork into background after authentication.\n");
174 fprintf(stderr, " -e char Set escape character; ``none'' = disable (default: ~).\n");
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000175
Damien Miller95def091999-11-25 00:26:21 +1100176 fprintf(stderr, " -c cipher Select encryption algorithm: "
Ben Lindstrom0ab2a012001-03-05 06:45:21 +0000177 "``3des'', ``blowfish''\n");
Ben Lindstrom3d73a342001-03-05 07:39:01 +0000178 fprintf(stderr, " -m macs Specify MAC algorithms for protocol version 2.\n");
Damien Miller95def091999-11-25 00:26:21 +1100179 fprintf(stderr, " -p port Connect to this port. Server must be on the same port.\n");
180 fprintf(stderr, " -L listen-port:host:port Forward local port to remote address\n");
181 fprintf(stderr, " -R listen-port:host:port Forward remote port to local address\n");
Kevin Stevesec84dc12000-12-13 17:45:15 +0000182 fprintf(stderr, " These cause %s to listen for connections on a port, and\n", __progname);
Damien Miller95def091999-11-25 00:26:21 +1100183 fprintf(stderr, " forward them to the other side by connecting to host:port.\n");
184 fprintf(stderr, " -C Enable compression.\n");
Damien Miller1383bd82000-04-06 12:32:37 +1000185 fprintf(stderr, " -N Do not execute a shell or command.\n");
Damien Miller95def091999-11-25 00:26:21 +1100186 fprintf(stderr, " -g Allow remote hosts to connect to forwarded ports.\n");
Ben Lindstrom1e7d3062001-02-09 02:36:43 +0000187 fprintf(stderr, " -1 Force protocol version 1.\n");
188 fprintf(stderr, " -2 Force protocol version 2.\n");
Damien Miller34132e52000-01-14 15:45:46 +1100189 fprintf(stderr, " -4 Use IPv4 only.\n");
190 fprintf(stderr, " -6 Use IPv6 only.\n");
Damien Miller95def091999-11-25 00:26:21 +1100191 fprintf(stderr, " -o 'option' Process the option as if it was read from a configuration file.\n");
Damien Miller832562e2001-01-30 09:30:01 +1100192 fprintf(stderr, " -s Invoke command (mandatory) as SSH2 subsystem.\n");
Damien Miller95def091999-11-25 00:26:21 +1100193 exit(1);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000194}
195
Damien Miller95def091999-11-25 00:26:21 +1100196/*
197 * Connects to the given host using rsh (or prints an error message and exits
198 * if rsh is not available). This function never returns.
199 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000200void
Damien Miller95def091999-11-25 00:26:21 +1100201rsh_connect(char *host, char *user, Buffer * command)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000202{
Damien Miller95def091999-11-25 00:26:21 +1100203 char *args[10];
204 int i;
205
206 log("Using rsh. WARNING: Connection will not be encrypted.");
207 /* Build argument list for rsh. */
208 i = 0;
209 args[i++] = _PATH_RSH;
210 /* host may have to come after user on some systems */
211 args[i++] = host;
212 if (user) {
213 args[i++] = "-l";
214 args[i++] = user;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000215 }
Damien Miller95def091999-11-25 00:26:21 +1100216 if (buffer_len(command) > 0) {
217 buffer_append(command, "\0", 1);
218 args[i++] = buffer_ptr(command);
219 }
220 args[i++] = NULL;
221 if (debug_flag) {
222 for (i = 0; args[i]; i++) {
223 if (i != 0)
224 fprintf(stderr, " ");
225 fprintf(stderr, "%s", args[i]);
226 }
227 fprintf(stderr, "\n");
228 }
229 execv(_PATH_RSH, args);
230 perror(_PATH_RSH);
231 exit(1);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000232}
233
Damien Miller0bc1bd82000-11-13 22:57:25 +1100234int ssh_session(void);
235int ssh_session2(void);
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000236void load_public_identity_files(void);
Damien Miller1383bd82000-04-06 12:32:37 +1000237
Damien Miller95def091999-11-25 00:26:21 +1100238/*
239 * Main program for the ssh client.
240 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000241int
242main(int ac, char **av)
243{
Damien Miller1383bd82000-04-06 12:32:37 +1000244 int i, opt, optind, exit_status, ok;
Damien Milleraae6c611999-12-06 11:47:28 +1100245 u_short fwd_port, fwd_host_port;
Damien Miller95def091999-11-25 00:26:21 +1100246 char *optarg, *cp, buf[256];
Damien Miller95def091999-11-25 00:26:21 +1100247 struct stat st;
Ben Lindstrom086cf212001-03-05 05:56:40 +0000248 struct passwd *pw;
Damien Miller1383bd82000-04-06 12:32:37 +1000249 int dummy;
Damien Miller95def091999-11-25 00:26:21 +1100250 uid_t original_effective_uid;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000251
Ben Lindstrom49a79c02000-11-17 03:47:20 +0000252 __progname = get_progname(av[0]);
Damien Millerf9b625c2000-07-09 22:42:32 +1000253 init_rng();
254
Damien Miller5428f641999-11-25 11:54:57 +1100255 /*
256 * Save the original real uid. It will be needed later (uid-swapping
257 * may clobber the real uid).
258 */
Damien Miller95def091999-11-25 00:26:21 +1100259 original_real_uid = getuid();
260 original_effective_uid = geteuid();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000261
Damien Miller05dd7952000-10-01 00:42:48 +1100262#ifdef HAVE_SETRLIMIT
Damien Miller95def091999-11-25 00:26:21 +1100263 /* If we are installed setuid root be careful to not drop core. */
264 if (original_real_uid != original_effective_uid) {
265 struct rlimit rlim;
266 rlim.rlim_cur = rlim.rlim_max = 0;
267 if (setrlimit(RLIMIT_CORE, &rlim) < 0)
268 fatal("setrlimit failed: %.100s", strerror(errno));
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000269 }
Damien Millerbac2d8a2000-09-05 16:13:06 +1100270#endif
Damien Miller5428f641999-11-25 11:54:57 +1100271 /*
272 * Use uid-swapping to give up root privileges for the duration of
273 * option processing. We will re-instantiate the rights when we are
274 * ready to create the privileged port, and will permanently drop
275 * them when the port has been created (actually, when the connection
276 * has been made, as we may need to create the port several times).
277 */
Damien Miller95def091999-11-25 00:26:21 +1100278 temporarily_use_uid(original_real_uid);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000279
Damien Miller5428f641999-11-25 11:54:57 +1100280 /*
281 * Set our umask to something reasonable, as some files are created
282 * with the default umask. This will make them world-readable but
283 * writable only by the owner, which is ok for all files for which we
284 * don't set the modes explicitly.
285 */
Damien Miller95def091999-11-25 00:26:21 +1100286 umask(022);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000287
Damien Miller95def091999-11-25 00:26:21 +1100288 /* Initialize option structure to indicate that no values have been set. */
289 initialize_options(&options);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000290
Damien Miller95def091999-11-25 00:26:21 +1100291 /* Parse command-line arguments. */
292 host = NULL;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000293
Damien Miller95def091999-11-25 00:26:21 +1100294 for (optind = 1; optind < ac; optind++) {
295 if (av[optind][0] != '-') {
296 if (host)
297 break;
298 if ((cp = strchr(av[optind], '@'))) {
Damien Miller4af51302000-04-16 11:18:38 +1000299 if(cp == av[optind])
300 usage();
Damien Miller95def091999-11-25 00:26:21 +1100301 options.user = av[optind];
302 *cp = '\0';
303 host = ++cp;
304 } else
305 host = av[optind];
306 continue;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000307 }
Damien Miller95def091999-11-25 00:26:21 +1100308 opt = av[optind][1];
309 if (!opt)
310 usage();
Ben Lindstrom06b33aa2001-02-15 03:01:59 +0000311 if (strchr("eilcmpLRo", opt)) { /* options with arguments */
Damien Miller95def091999-11-25 00:26:21 +1100312 optarg = av[optind] + 2;
313 if (strcmp(optarg, "") == 0) {
314 if (optind >= ac - 1)
315 usage();
316 optarg = av[++optind];
317 }
318 } else {
319 if (av[optind][2])
320 usage();
321 optarg = NULL;
322 }
323 switch (opt) {
Ben Lindstrom1e7d3062001-02-09 02:36:43 +0000324 case '1':
325 options.protocol = SSH_PROTO_1;
326 break;
Damien Miller4af51302000-04-16 11:18:38 +1000327 case '2':
328 options.protocol = SSH_PROTO_2;
329 break;
Damien Miller34132e52000-01-14 15:45:46 +1100330 case '4':
331 IPv4or6 = AF_INET;
332 break;
Damien Miller34132e52000-01-14 15:45:46 +1100333 case '6':
334 IPv4or6 = AF_INET6;
335 break;
Damien Miller95def091999-11-25 00:26:21 +1100336 case 'n':
337 stdin_null_flag = 1;
338 break;
Damien Miller95def091999-11-25 00:26:21 +1100339 case 'f':
340 fork_after_authentication_flag = 1;
341 stdin_null_flag = 1;
342 break;
Damien Miller95def091999-11-25 00:26:21 +1100343 case 'x':
344 options.forward_x11 = 0;
345 break;
Damien Miller95def091999-11-25 00:26:21 +1100346 case 'X':
347 options.forward_x11 = 1;
348 break;
Damien Miller95def091999-11-25 00:26:21 +1100349 case 'g':
350 options.gateway_ports = 1;
351 break;
Damien Miller95def091999-11-25 00:26:21 +1100352 case 'P':
353 options.use_privileged_port = 0;
354 break;
Damien Miller95def091999-11-25 00:26:21 +1100355 case 'a':
356 options.forward_agent = 0;
357 break;
Damien Millerb1715dc2000-05-30 13:44:51 +1000358 case 'A':
359 options.forward_agent = 1;
360 break;
Damien Miller95def091999-11-25 00:26:21 +1100361#ifdef AFS
362 case 'k':
363 options.kerberos_tgt_passing = 0;
364 options.afs_token_passing = 0;
365 break;
366#endif
367 case 'i':
368 if (stat(optarg, &st) < 0) {
369 fprintf(stderr, "Warning: Identity file %s does not exist.\n",
Damien Miller0bc1bd82000-11-13 22:57:25 +1100370 optarg);
Damien Miller95def091999-11-25 00:26:21 +1100371 break;
372 }
373 if (options.num_identity_files >= SSH_MAX_IDENTITY_FILES)
374 fatal("Too many identity files specified (max %d)",
Damien Miller0bc1bd82000-11-13 22:57:25 +1100375 SSH_MAX_IDENTITY_FILES);
376 options.identity_files[options.num_identity_files++] = xstrdup(optarg);
Damien Miller95def091999-11-25 00:26:21 +1100377 break;
Damien Miller95def091999-11-25 00:26:21 +1100378 case 't':
Ben Lindstrom4dccfa52000-12-28 16:40:05 +0000379 if (tty_flag)
380 force_tty_flag = 1;
Damien Miller95def091999-11-25 00:26:21 +1100381 tty_flag = 1;
382 break;
Damien Miller95def091999-11-25 00:26:21 +1100383 case 'v':
Damien Millere4340be2000-09-16 13:29:08 +1100384 if (0 == debug_flag) {
385 debug_flag = 1;
386 options.log_level = SYSLOG_LEVEL_DEBUG1;
387 } else if (options.log_level < SYSLOG_LEVEL_DEBUG3) {
388 options.log_level++;
389 break;
390 } else {
Ben Lindstrom6df8ef42001-03-05 07:47:23 +0000391 fatal("Too high debugging level.");
Damien Millere4340be2000-09-16 13:29:08 +1100392 }
393 /* fallthrough */
Damien Miller95def091999-11-25 00:26:21 +1100394 case 'V':
Damien Miller225736c2001-02-19 21:51:08 +1100395 fprintf(stderr,
396 "%s, SSH protocols %d.%d/%d.%d, OpenSSL 0x%8.8lx\n",
Damien Miller78928792000-04-12 20:17:38 +1000397 SSH_VERSION,
398 PROTOCOL_MAJOR_1, PROTOCOL_MINOR_1,
Damien Miller225736c2001-02-19 21:51:08 +1100399 PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2,
400 SSLeay());
Damien Miller95def091999-11-25 00:26:21 +1100401 if (opt == 'V')
402 exit(0);
Damien Miller95def091999-11-25 00:26:21 +1100403 break;
Damien Miller95def091999-11-25 00:26:21 +1100404 case 'q':
405 options.log_level = SYSLOG_LEVEL_QUIET;
406 break;
Damien Miller95def091999-11-25 00:26:21 +1100407 case 'e':
408 if (optarg[0] == '^' && optarg[2] == 0 &&
Ben Lindstrom46c16222000-12-22 01:43:59 +0000409 (u_char) optarg[1] >= 64 && (u_char) optarg[1] < 128)
410 options.escape_char = (u_char) optarg[1] & 31;
Damien Miller95def091999-11-25 00:26:21 +1100411 else if (strlen(optarg) == 1)
Ben Lindstrom46c16222000-12-22 01:43:59 +0000412 options.escape_char = (u_char) optarg[0];
Damien Miller95def091999-11-25 00:26:21 +1100413 else if (strcmp(optarg, "none") == 0)
414 options.escape_char = -2;
415 else {
416 fprintf(stderr, "Bad escape character '%s'.\n", optarg);
417 exit(1);
418 }
419 break;
Damien Miller95def091999-11-25 00:26:21 +1100420 case 'c':
Damien Millereba71ba2000-04-29 23:57:08 +1000421 if (ciphers_valid(optarg)) {
422 /* SSH2 only */
423 options.ciphers = xstrdup(optarg);
Damien Miller30c3d422000-05-09 11:02:59 +1000424 options.cipher = SSH_CIPHER_ILLEGAL;
Damien Millereba71ba2000-04-29 23:57:08 +1000425 } else {
426 /* SSH1 only */
Damien Millere39cacc2000-11-29 12:18:44 +1100427 options.cipher = cipher_number(optarg);
428 if (options.cipher == -1) {
Damien Millereba71ba2000-04-29 23:57:08 +1000429 fprintf(stderr, "Unknown cipher type '%s'\n", optarg);
430 exit(1);
431 }
Damien Millere39cacc2000-11-29 12:18:44 +1100432 if (options.cipher == SSH_CIPHER_3DES) {
433 options.ciphers = "3des-cbc";
434 } else if (options.cipher == SSH_CIPHER_BLOWFISH) {
435 options.ciphers = "blowfish-cbc";
436 } else {
437 options.ciphers = (char *)-1;
438 }
Damien Miller95def091999-11-25 00:26:21 +1100439 }
440 break;
Ben Lindstrom06b33aa2001-02-15 03:01:59 +0000441 case 'm':
442 if (mac_valid(optarg))
443 options.macs = xstrdup(optarg);
444 else {
445 fprintf(stderr, "Unknown mac type '%s'\n", optarg);
446 exit(1);
447 }
448 break;
Damien Miller95def091999-11-25 00:26:21 +1100449 case 'p':
450 options.port = atoi(optarg);
Damien Miller95def091999-11-25 00:26:21 +1100451 break;
Damien Miller95def091999-11-25 00:26:21 +1100452 case 'l':
453 options.user = optarg;
454 break;
Damien Miller95def091999-11-25 00:26:21 +1100455 case 'R':
Damien Miller34132e52000-01-14 15:45:46 +1100456 if (sscanf(optarg, "%hu/%255[^/]/%hu", &fwd_port, buf,
457 &fwd_host_port) != 3 &&
458 sscanf(optarg, "%hu:%255[^:]:%hu", &fwd_port, buf,
459 &fwd_host_port) != 3) {
Damien Miller95def091999-11-25 00:26:21 +1100460 fprintf(stderr, "Bad forwarding specification '%s'.\n", optarg);
461 usage();
462 /* NOTREACHED */
463 }
464 add_remote_forward(&options, fwd_port, buf, fwd_host_port);
465 break;
Damien Miller95def091999-11-25 00:26:21 +1100466 case 'L':
Damien Miller34132e52000-01-14 15:45:46 +1100467 if (sscanf(optarg, "%hu/%255[^/]/%hu", &fwd_port, buf,
468 &fwd_host_port) != 3 &&
469 sscanf(optarg, "%hu:%255[^:]:%hu", &fwd_port, buf,
470 &fwd_host_port) != 3) {
Damien Miller95def091999-11-25 00:26:21 +1100471 fprintf(stderr, "Bad forwarding specification '%s'.\n", optarg);
472 usage();
473 /* NOTREACHED */
474 }
475 add_local_forward(&options, fwd_port, buf, fwd_host_port);
476 break;
Damien Miller95def091999-11-25 00:26:21 +1100477 case 'C':
478 options.compression = 1;
479 break;
Damien Miller1383bd82000-04-06 12:32:37 +1000480 case 'N':
481 no_shell_flag = 1;
482 no_tty_flag = 1;
483 break;
Damien Miller1383bd82000-04-06 12:32:37 +1000484 case 'T':
485 no_tty_flag = 1;
486 break;
Damien Miller95def091999-11-25 00:26:21 +1100487 case 'o':
488 dummy = 1;
489 if (process_config_line(&options, host ? host : "", optarg,
490 "command-line", 0, &dummy) != 0)
491 exit(1);
492 break;
Damien Miller832562e2001-01-30 09:30:01 +1100493 case 's':
494 subsystem_flag = 1;
495 break;
Damien Miller95def091999-11-25 00:26:21 +1100496 default:
497 usage();
498 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000499 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000500
Damien Miller95def091999-11-25 00:26:21 +1100501 /* Check that we got a host name. */
502 if (!host)
503 usage();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000504
Damien Millercb5e44a2000-09-29 12:12:36 +1100505 SSLeay_add_all_algorithms();
Damien Miller0bc1bd82000-11-13 22:57:25 +1100506 ERR_load_crypto_strings();
Damien Millercb5e44a2000-09-29 12:12:36 +1100507
Damien Miller95def091999-11-25 00:26:21 +1100508 /* Initialize the command to execute on remote host. */
509 buffer_init(&command);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000510
Damien Miller5428f641999-11-25 11:54:57 +1100511 /*
512 * Save the command to execute on the remote host in a buffer. There
513 * is no limit on the length of the command, except by the maximum
514 * packet size. Also sets the tty flag if there is no command.
515 */
Damien Miller95def091999-11-25 00:26:21 +1100516 if (optind == ac) {
517 /* No command specified - execute shell on a tty. */
518 tty_flag = 1;
Damien Miller832562e2001-01-30 09:30:01 +1100519 if (subsystem_flag) {
520 fprintf(stderr, "You must specify a subsystem to invoke.");
521 usage();
522 }
Damien Miller95def091999-11-25 00:26:21 +1100523 } else {
524 /* A command has been specified. Store it into the
525 buffer. */
526 for (i = optind; i < ac; i++) {
527 if (i > optind)
528 buffer_append(&command, " ", 1);
529 buffer_append(&command, av[i], strlen(av[i]));
530 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000531 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000532
Damien Miller95def091999-11-25 00:26:21 +1100533 /* Cannot fork to background if no command. */
Damien Millercaf6dd62000-08-29 11:33:50 +1100534 if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag)
Damien Miller95def091999-11-25 00:26:21 +1100535 fatal("Cannot fork into background without a command to execute.");
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000536
Damien Miller95def091999-11-25 00:26:21 +1100537 /* Allocate a tty by default if no command specified. */
538 if (buffer_len(&command) == 0)
539 tty_flag = 1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000540
Ben Lindstromc72745a2000-12-02 19:03:54 +0000541 /* Force no tty*/
542 if (no_tty_flag)
543 tty_flag = 0;
Damien Miller95def091999-11-25 00:26:21 +1100544 /* Do not allocate a tty if stdin is not a tty. */
Ben Lindstrom4dccfa52000-12-28 16:40:05 +0000545 if (!isatty(fileno(stdin)) && !force_tty_flag) {
Damien Miller95def091999-11-25 00:26:21 +1100546 if (tty_flag)
Ben Lindstrom6df8ef42001-03-05 07:47:23 +0000547 log("Pseudo-terminal will not be allocated because stdin is not a terminal.");
Damien Miller95def091999-11-25 00:26:21 +1100548 tty_flag = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000549 }
Damien Miller1383bd82000-04-06 12:32:37 +1000550
Damien Miller95def091999-11-25 00:26:21 +1100551 /* Get user data. */
552 pw = getpwuid(original_real_uid);
553 if (!pw) {
Ben Lindstrom6df8ef42001-03-05 07:47:23 +0000554 log("You don't exist, go away!");
Damien Miller95def091999-11-25 00:26:21 +1100555 exit(1);
556 }
557 /* Take a copy of the returned structure. */
Ben Lindstrom086cf212001-03-05 05:56:40 +0000558 pw = pwcopy(pw);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000559
Ben Lindstrom8a432f52001-03-05 07:24:46 +0000560 /*
561 * Initialize "log" output. Since we are the client all output
562 * actually goes to stderr.
563 */
564 log_init(av[0], SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_USER, 1);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000565
Damien Miller95def091999-11-25 00:26:21 +1100566 /* Read per-user configuration file. */
Ben Lindstrom226cfa02001-01-22 05:34:40 +0000567 snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, _PATH_SSH_USER_CONFFILE);
Damien Miller95def091999-11-25 00:26:21 +1100568 read_config_file(buf, host, &options);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000569
Damien Miller95def091999-11-25 00:26:21 +1100570 /* Read systemwide configuration file. */
Ben Lindstrom226cfa02001-01-22 05:34:40 +0000571 read_config_file(_PATH_HOST_CONFIG_FILE, host, &options);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000572
Damien Miller95def091999-11-25 00:26:21 +1100573 /* Fill configuration defaults. */
574 fill_default_options(&options);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000575
Damien Miller95def091999-11-25 00:26:21 +1100576 /* reinit */
Ben Lindstrom8a432f52001-03-05 07:24:46 +0000577 log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 1);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000578
Damien Miller95def091999-11-25 00:26:21 +1100579 if (options.user == NULL)
580 options.user = xstrdup(pw->pw_name);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000581
Damien Miller95def091999-11-25 00:26:21 +1100582 if (options.hostname != NULL)
583 host = options.hostname;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000584
Damien Miller95def091999-11-25 00:26:21 +1100585 /* Disable rhosts authentication if not running as root. */
Damien Millerbac2d8a2000-09-05 16:13:06 +1100586#ifdef HAVE_CYGWIN
587 /* Ignore uid if running under Windows */
588 if (!options.use_privileged_port) {
589#else
Damien Miller95def091999-11-25 00:26:21 +1100590 if (original_effective_uid != 0 || !options.use_privileged_port) {
Damien Millerbac2d8a2000-09-05 16:13:06 +1100591#endif
Kevin Stevesfcec7f82000-12-15 19:55:48 +0000592 debug("Rhosts Authentication disabled, "
593 "originating port will not be trusted.");
Damien Miller95def091999-11-25 00:26:21 +1100594 options.rhosts_authentication = 0;
Damien Miller95def091999-11-25 00:26:21 +1100595 }
Damien Miller5428f641999-11-25 11:54:57 +1100596 /*
597 * If using rsh has been selected, exec it now (without trying
598 * anything else). Note that we must release privileges first.
599 */
Damien Miller95def091999-11-25 00:26:21 +1100600 if (options.use_rsh) {
Damien Miller5428f641999-11-25 11:54:57 +1100601 /*
602 * Restore our superuser privileges. This must be done
603 * before permanently setting the uid.
604 */
Damien Miller95def091999-11-25 00:26:21 +1100605 restore_uid();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000606
Damien Miller95def091999-11-25 00:26:21 +1100607 /* Switch to the original uid permanently. */
608 permanently_set_uid(original_real_uid);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000609
Damien Miller95def091999-11-25 00:26:21 +1100610 /* Execute rsh. */
611 rsh_connect(host, options.user, &command);
612 fatal("rsh_connect returned");
613 }
614 /* Restore our superuser privileges. */
615 restore_uid();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000616
Kevin Stevesfcec7f82000-12-15 19:55:48 +0000617 /* Open a connection to the remote host. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000618
Damien Miller95def091999-11-25 00:26:21 +1100619 ok = ssh_connect(host, &hostaddr, options.port,
Kevin Stevesfcec7f82000-12-15 19:55:48 +0000620 options.connection_attempts,
621 original_effective_uid != 0 || !options.use_privileged_port,
622 original_real_uid,
623 options.proxy_command);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000624
Damien Miller5428f641999-11-25 11:54:57 +1100625 /*
626 * If we successfully made the connection, load the host private key
627 * in case we will need it later for combined rsa-rhosts
628 * authentication. This must be done before releasing extra
629 * privileges, because the file is only readable by root.
630 */
Damien Millereba71ba2000-04-29 23:57:08 +1000631 if (ok && (options.protocol & SSH_PROTO_1)) {
632 Key k;
Damien Miller95def091999-11-25 00:26:21 +1100633 host_private_key = RSA_new();
Damien Miller0bc1bd82000-11-13 22:57:25 +1100634 k.type = KEY_RSA1;
Damien Millereba71ba2000-04-29 23:57:08 +1000635 k.rsa = host_private_key;
Ben Lindstrom226cfa02001-01-22 05:34:40 +0000636 if (load_private_key(_PATH_HOST_KEY_FILE, "", &k, NULL))
Damien Miller95def091999-11-25 00:26:21 +1100637 host_private_key_loaded = 1;
638 }
Damien Miller5428f641999-11-25 11:54:57 +1100639 /*
640 * Get rid of any extra privileges that we may have. We will no
641 * longer need them. Also, extra privileges could make it very hard
642 * to read identity files and other non-world-readable files from the
643 * user's home directory if it happens to be on a NFS volume where
644 * root is mapped to nobody.
645 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000646
Damien Miller5428f641999-11-25 11:54:57 +1100647 /*
648 * Note that some legacy systems need to postpone the following call
649 * to permanently_set_uid() until the private hostkey is destroyed
650 * with RSA_free(). Otherwise the calling user could ptrace() the
651 * process, read the private hostkey and impersonate the host.
652 * OpenBSD does not allow ptracing of setuid processes.
653 */
Damien Miller95def091999-11-25 00:26:21 +1100654 permanently_set_uid(original_real_uid);
655
Damien Miller5428f641999-11-25 11:54:57 +1100656 /*
657 * Now that we are back to our own permissions, create ~/.ssh
658 * directory if it doesn\'t already exist.
659 */
Ben Lindstrom226cfa02001-01-22 05:34:40 +0000660 snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, _PATH_SSH_USER_DIR);
Damien Miller95def091999-11-25 00:26:21 +1100661 if (stat(buf, &st) < 0)
Damien Millerbe484b52000-07-15 14:14:16 +1000662 if (mkdir(buf, 0700) < 0)
Damien Miller95def091999-11-25 00:26:21 +1100663 error("Could not create directory '%.200s'.", buf);
664
665 /* Check if the connection failed, and try "rsh" if appropriate. */
666 if (!ok) {
667 if (options.port != 0)
Damien Milleraae6c611999-12-06 11:47:28 +1100668 log("Secure connection to %.100s on port %hu refused%.100s.",
Damien Miller95def091999-11-25 00:26:21 +1100669 host, options.port,
670 options.fallback_to_rsh ? "; reverting to insecure method" : "");
671 else
672 log("Secure connection to %.100s refused%.100s.", host,
673 options.fallback_to_rsh ? "; reverting to insecure method" : "");
674
675 if (options.fallback_to_rsh) {
676 rsh_connect(host, options.user, &command);
677 fatal("rsh_connect returned");
678 }
679 exit(1);
680 }
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000681 /* load options.identity_files */
682 load_public_identity_files();
683
684 /* Expand ~ in known host file names. */
685 /* XXX mem-leaks: */
Damien Miller0bc1bd82000-11-13 22:57:25 +1100686 options.system_hostfile =
687 tilde_expand_filename(options.system_hostfile, original_real_uid);
688 options.user_hostfile =
689 tilde_expand_filename(options.user_hostfile, original_real_uid);
690 options.system_hostfile2 =
691 tilde_expand_filename(options.system_hostfile2, original_real_uid);
692 options.user_hostfile2 =
693 tilde_expand_filename(options.user_hostfile2, original_real_uid);
Damien Miller95def091999-11-25 00:26:21 +1100694
695 /* Log into the remote system. This never returns if the login fails. */
696 ssh_login(host_private_key_loaded, host_private_key,
Damien Miller34132e52000-01-14 15:45:46 +1100697 host, (struct sockaddr *)&hostaddr, original_real_uid);
Damien Miller95def091999-11-25 00:26:21 +1100698
699 /* We no longer need the host private key. Clear it now. */
700 if (host_private_key_loaded)
701 RSA_free(host_private_key); /* Destroys contents safely */
702
Damien Miller1383bd82000-04-06 12:32:37 +1000703 exit_status = compat20 ? ssh_session2() : ssh_session();
704 packet_close();
705 return exit_status;
706}
707
Damien Millerbd483e72000-04-30 10:00:53 +1000708void
709x11_get_proto(char *proto, int proto_len, char *data, int data_len)
710{
711 char line[512];
712 FILE *f;
713 int got_data = 0, i;
714
Damien Millerd3a18572000-06-07 19:55:44 +1000715 if (options.xauth_location) {
716 /* Try to get Xauthority information for the display. */
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000717 snprintf(line, sizeof line, "%.100s list %.200s 2>" _PATH_DEVNULL,
Damien Millerd3a18572000-06-07 19:55:44 +1000718 options.xauth_location, getenv("DISPLAY"));
719 f = popen(line, "r");
720 if (f && fgets(line, sizeof(line), f) &&
721 sscanf(line, "%*s %s %s", proto, data) == 2)
722 got_data = 1;
723 if (f)
724 pclose(f);
725 }
Damien Millerbd483e72000-04-30 10:00:53 +1000726 /*
727 * If we didn't get authentication data, just make up some
728 * data. The forwarding code will check the validity of the
729 * response anyway, and substitute this data. The X11
730 * server, however, will ignore this fake data and use
731 * whatever authentication mechanisms it was using otherwise
732 * for the local connection.
733 */
734 if (!got_data) {
735 u_int32_t rand = 0;
736
737 strlcpy(proto, "MIT-MAGIC-COOKIE-1", proto_len);
738 for (i = 0; i < 16; i++) {
739 if (i % 4 == 0)
740 rand = arc4random();
741 snprintf(data + 2 * i, data_len - 2 * i, "%02x", rand & 0xff);
742 rand >>= 8;
743 }
744 }
745}
746
Damien Miller0bc1bd82000-11-13 22:57:25 +1100747void
748ssh_init_forwarding(void)
749{
Kevin Steves12057502001-02-05 14:54:34 +0000750 int success = 0;
Damien Miller0bc1bd82000-11-13 22:57:25 +1100751 int i;
Kevin Steves12057502001-02-05 14:54:34 +0000752
Damien Miller0bc1bd82000-11-13 22:57:25 +1100753 /* Initiate local TCP/IP port forwardings. */
754 for (i = 0; i < options.num_local_forwards; i++) {
755 debug("Connections to local port %d forwarded to remote address %.200s:%d",
756 options.local_forwards[i].port,
757 options.local_forwards[i].host,
758 options.local_forwards[i].host_port);
Kevin Steves12057502001-02-05 14:54:34 +0000759 success += channel_request_local_forwarding(
Damien Miller0bc1bd82000-11-13 22:57:25 +1100760 options.local_forwards[i].port,
761 options.local_forwards[i].host,
762 options.local_forwards[i].host_port,
763 options.gateway_ports);
764 }
Kevin Steves12057502001-02-05 14:54:34 +0000765 if (i > 0 && success == 0)
766 error("Could not request local forwarding.");
Damien Miller0bc1bd82000-11-13 22:57:25 +1100767
768 /* Initiate remote TCP/IP port forwardings. */
769 for (i = 0; i < options.num_remote_forwards; i++) {
770 debug("Connections to remote port %d forwarded to local address %.200s:%d",
771 options.remote_forwards[i].port,
772 options.remote_forwards[i].host,
773 options.remote_forwards[i].host_port);
774 channel_request_remote_forwarding(
775 options.remote_forwards[i].port,
776 options.remote_forwards[i].host,
777 options.remote_forwards[i].host_port);
778 }
779}
780
781void
782check_agent_present(void)
783{
784 if (options.forward_agent) {
785 /* Clear agent forwarding if we don\'t have an agent. */
786 int authfd = ssh_get_authentication_socket();
787 if (authfd < 0)
788 options.forward_agent = 0;
789 else
790 ssh_close_authentication_socket(authfd);
791 }
792}
793
Damien Miller1383bd82000-04-06 12:32:37 +1000794int
795ssh_session(void)
796{
797 int type;
Damien Miller1383bd82000-04-06 12:32:37 +1000798 int plen;
799 int interactive = 0;
800 int have_tty = 0;
801 struct winsize ws;
Damien Miller1383bd82000-04-06 12:32:37 +1000802 char *cp;
803
Damien Miller95def091999-11-25 00:26:21 +1100804 /* Enable compression if requested. */
805 if (options.compression) {
806 debug("Requesting compression at level %d.", options.compression_level);
807
808 if (options.compression_level < 1 || options.compression_level > 9)
809 fatal("Compression level must be from 1 (fast) to 9 (slow, best).");
810
811 /* Send the request. */
812 packet_start(SSH_CMSG_REQUEST_COMPRESSION);
813 packet_put_int(options.compression_level);
814 packet_send();
815 packet_write_wait();
816 type = packet_read(&plen);
817 if (type == SSH_SMSG_SUCCESS)
818 packet_start_compression(options.compression_level);
819 else if (type == SSH_SMSG_FAILURE)
820 log("Warning: Remote host refused compression.");
821 else
822 packet_disconnect("Protocol error waiting for compression response.");
823 }
824 /* Allocate a pseudo tty if appropriate. */
825 if (tty_flag) {
826 debug("Requesting pty.");
827
828 /* Start the packet. */
829 packet_start(SSH_CMSG_REQUEST_PTY);
830
831 /* Store TERM in the packet. There is no limit on the
832 length of the string. */
833 cp = getenv("TERM");
834 if (!cp)
835 cp = "";
836 packet_put_string(cp, strlen(cp));
837
838 /* Store window size in the packet. */
839 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
840 memset(&ws, 0, sizeof(ws));
841 packet_put_int(ws.ws_row);
842 packet_put_int(ws.ws_col);
843 packet_put_int(ws.ws_xpixel);
844 packet_put_int(ws.ws_ypixel);
845
846 /* Store tty modes in the packet. */
847 tty_make_modes(fileno(stdin));
848
849 /* Send the packet, and wait for it to leave. */
850 packet_send();
851 packet_write_wait();
852
853 /* Read response from the server. */
854 type = packet_read(&plen);
Damien Miller450a7a12000-03-26 13:04:51 +1000855 if (type == SSH_SMSG_SUCCESS) {
Damien Miller95def091999-11-25 00:26:21 +1100856 interactive = 1;
Damien Miller1383bd82000-04-06 12:32:37 +1000857 have_tty = 1;
Damien Miller450a7a12000-03-26 13:04:51 +1000858 } else if (type == SSH_SMSG_FAILURE)
Damien Miller95def091999-11-25 00:26:21 +1100859 log("Warning: Remote host failed or refused to allocate a pseudo tty.");
860 else
861 packet_disconnect("Protocol error waiting for pty request response.");
862 }
863 /* Request X11 forwarding if enabled and DISPLAY is set. */
864 if (options.forward_x11 && getenv("DISPLAY") != NULL) {
Damien Millerbd483e72000-04-30 10:00:53 +1000865 char proto[512], data[512];
866 /* Get reasonable local authentication information. */
867 x11_get_proto(proto, sizeof proto, data, sizeof data);
868 /* Request forwarding with authentication spoofing. */
Damien Miller95def091999-11-25 00:26:21 +1100869 debug("Requesting X11 forwarding with authentication spoofing.");
Damien Millerbd483e72000-04-30 10:00:53 +1000870 x11_request_forwarding_with_spoofing(0, proto, data);
Damien Miller95def091999-11-25 00:26:21 +1100871
872 /* Read response from the server. */
873 type = packet_read(&plen);
874 if (type == SSH_SMSG_SUCCESS) {
Damien Miller95def091999-11-25 00:26:21 +1100875 interactive = 1;
Damien Millerbd483e72000-04-30 10:00:53 +1000876 } else if (type == SSH_SMSG_FAILURE) {
Damien Miller95def091999-11-25 00:26:21 +1100877 log("Warning: Remote host denied X11 forwarding.");
Damien Millerbd483e72000-04-30 10:00:53 +1000878 } else {
Damien Miller95def091999-11-25 00:26:21 +1100879 packet_disconnect("Protocol error waiting for X11 forwarding");
Damien Millerbd483e72000-04-30 10:00:53 +1000880 }
Damien Miller95def091999-11-25 00:26:21 +1100881 }
882 /* Tell the packet module whether this is an interactive session. */
Ben Lindstrombf555ba2001-01-18 02:04:35 +0000883 packet_set_interactive(interactive);
Damien Miller95def091999-11-25 00:26:21 +1100884
885 /* Request authentication agent forwarding if appropriate. */
Damien Miller0bc1bd82000-11-13 22:57:25 +1100886 check_agent_present();
887
Damien Miller95def091999-11-25 00:26:21 +1100888 if (options.forward_agent) {
889 debug("Requesting authentication agent forwarding.");
890 auth_request_forwarding();
891
892 /* Read response from the server. */
893 type = packet_read(&plen);
894 packet_integrity_check(plen, 0, type);
895 if (type != SSH_SMSG_SUCCESS)
896 log("Warning: Remote host denied authentication agent forwarding.");
897 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000898
Damien Miller0bc1bd82000-11-13 22:57:25 +1100899 /* Initiate port forwardings. */
900 ssh_init_forwarding();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000901
Damien Miller5428f641999-11-25 11:54:57 +1100902 /* If requested, let ssh continue in the background. */
Damien Miller4af51302000-04-16 11:18:38 +1000903 if (fork_after_authentication_flag)
Damien Miller5428f641999-11-25 11:54:57 +1100904 if (daemon(1, 1) < 0)
905 fatal("daemon() failed: %.200s", strerror(errno));
906
907 /*
908 * If a command was specified on the command line, execute the
909 * command now. Otherwise request the server to start a shell.
910 */
Damien Miller95def091999-11-25 00:26:21 +1100911 if (buffer_len(&command) > 0) {
912 int len = buffer_len(&command);
913 if (len > 900)
914 len = 900;
915 debug("Sending command: %.*s", len, buffer_ptr(&command));
916 packet_start(SSH_CMSG_EXEC_CMD);
917 packet_put_string(buffer_ptr(&command), buffer_len(&command));
918 packet_send();
919 packet_write_wait();
920 } else {
921 debug("Requesting shell.");
922 packet_start(SSH_CMSG_EXEC_SHELL);
923 packet_send();
924 packet_write_wait();
925 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000926
Damien Miller95def091999-11-25 00:26:21 +1100927 /* Enter the interactive session. */
Damien Millerad833b32000-08-23 10:46:23 +1000928 return client_loop(have_tty, tty_flag ? options.escape_char : -1, 0);
Damien Miller1383bd82000-04-06 12:32:37 +1000929}
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000930
Damien Miller1383bd82000-04-06 12:32:37 +1000931void
Ben Lindstrom1e7d3062001-02-09 02:36:43 +0000932client_subsystem_reply(int type, int plen, void *ctxt)
933{
934 int id, len;
935
936 id = packet_get_int();
937 len = buffer_len(&command);
Ben Lindstrom4040fe12001-03-05 06:52:57 +0000938 if (len > 900)
939 len = 900;
Ben Lindstrom1e7d3062001-02-09 02:36:43 +0000940 packet_done();
941 if (type == SSH2_MSG_CHANNEL_FAILURE)
942 fatal("Request for subsystem '%.*s' failed on channel %d",
943 len, buffer_ptr(&command), id);
944}
945
946void
Damien Miller0bc1bd82000-11-13 22:57:25 +1100947ssh_session2_callback(int id, void *arg)
Damien Miller1383bd82000-04-06 12:32:37 +1000948{
949 int len;
Ben Lindstrombf555ba2001-01-18 02:04:35 +0000950 int interactive = 0;
951
Kevin Stevesadf74cd2001-02-05 14:22:50 +0000952 debug("client_init id %d arg %ld", id, (long)arg);
Damien Miller1383bd82000-04-06 12:32:37 +1000953
954 if (no_shell_flag)
955 goto done;
956
957 if (tty_flag) {
958 struct winsize ws;
959 char *cp;
960 cp = getenv("TERM");
961 if (!cp)
962 cp = "";
963 /* Store window size in the packet. */
964 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
965 memset(&ws, 0, sizeof(ws));
966
967 channel_request_start(id, "pty-req", 0);
968 packet_put_cstring(cp);
969 packet_put_int(ws.ws_col);
970 packet_put_int(ws.ws_row);
971 packet_put_int(ws.ws_xpixel);
972 packet_put_int(ws.ws_ypixel);
973 packet_put_cstring(""); /* XXX: encode terminal modes */
974 packet_send();
Ben Lindstrombf555ba2001-01-18 02:04:35 +0000975 interactive = 1;
Damien Miller1383bd82000-04-06 12:32:37 +1000976 /* XXX wait for reply */
977 }
Damien Millerbd483e72000-04-30 10:00:53 +1000978 if (options.forward_x11 &&
979 getenv("DISPLAY") != NULL) {
980 char proto[512], data[512];
981 /* Get reasonable local authentication information. */
982 x11_get_proto(proto, sizeof proto, data, sizeof data);
983 /* Request forwarding with authentication spoofing. */
984 debug("Requesting X11 forwarding with authentication spoofing.");
985 x11_request_forwarding_with_spoofing(id, proto, data);
Ben Lindstrombf555ba2001-01-18 02:04:35 +0000986 interactive = 1;
Damien Millerbd483e72000-04-30 10:00:53 +1000987 /* XXX wait for reply */
988 }
989
Damien Miller0bc1bd82000-11-13 22:57:25 +1100990 check_agent_present();
991 if (options.forward_agent) {
992 debug("Requesting authentication agent forwarding.");
993 channel_request_start(id, "auth-agent-req@openssh.com", 0);
994 packet_send();
995 }
996
Damien Miller1383bd82000-04-06 12:32:37 +1000997 len = buffer_len(&command);
998 if (len > 0) {
999 if (len > 900)
1000 len = 900;
Damien Miller832562e2001-01-30 09:30:01 +11001001 if (subsystem_flag) {
1002 debug("Sending subsystem: %.*s", len, buffer_ptr(&command));
Ben Lindstrom1e7d3062001-02-09 02:36:43 +00001003 channel_request_start(id, "subsystem", /*want reply*/ 1);
1004 /* register callback for reply */
1005 /* XXX we asume that client_loop has already been called */
1006 dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &client_subsystem_reply);
1007 dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &client_subsystem_reply);
Damien Miller832562e2001-01-30 09:30:01 +11001008 } else {
1009 debug("Sending command: %.*s", len, buffer_ptr(&command));
1010 channel_request_start(id, "exec", 0);
1011 }
Ben Lindstrom4040fe12001-03-05 06:52:57 +00001012 packet_put_string(buffer_ptr(&command), buffer_len(&command));
Damien Miller1383bd82000-04-06 12:32:37 +10001013 packet_send();
1014 } else {
1015 channel_request(id, "shell", 0);
1016 }
1017 /* channel_callback(id, SSH2_MSG_OPEN_CONFIGMATION, client_init, 0); */
Ben Lindstrom1e7d3062001-02-09 02:36:43 +00001018
Damien Miller1383bd82000-04-06 12:32:37 +10001019done:
1020 /* register different callback, etc. XXX */
Ben Lindstrombf555ba2001-01-18 02:04:35 +00001021 packet_set_interactive(interactive);
Damien Miller1383bd82000-04-06 12:32:37 +10001022}
1023
1024int
1025ssh_session2(void)
1026{
1027 int window, packetmax, id;
Damien Millerad833b32000-08-23 10:46:23 +10001028 int in, out, err;
1029
Damien Millercaf6dd62000-08-29 11:33:50 +11001030 if (stdin_null_flag) {
Ben Lindstrom31ca54a2001-02-09 02:11:24 +00001031 in = open(_PATH_DEVNULL, O_RDONLY);
Damien Millercaf6dd62000-08-29 11:33:50 +11001032 } else {
1033 in = dup(STDIN_FILENO);
1034 }
1035 out = dup(STDOUT_FILENO);
1036 err = dup(STDERR_FILENO);
1037
1038 if (in < 0 || out < 0 || err < 0)
1039 fatal("dup() in/out/err failed");
1040
Damien Miller69b69aa2000-10-28 14:19:58 +11001041 /* enable nonblocking unless tty */
1042 if (!isatty(in))
1043 set_nonblock(in);
1044 if (!isatty(out))
1045 set_nonblock(out);
1046 if (!isatty(err))
1047 set_nonblock(err);
1048
Damien Miller0bc1bd82000-11-13 22:57:25 +11001049 /* XXX should be pre-session */
1050 ssh_init_forwarding();
Kevin Stevesef4eea92001-02-05 12:42:17 +00001051
Damien Millerad833b32000-08-23 10:46:23 +10001052 /* If requested, let ssh continue in the background. */
1053 if (fork_after_authentication_flag)
1054 if (daemon(1, 1) < 0)
1055 fatal("daemon() failed: %.200s", strerror(errno));
1056
Damien Millere4340be2000-09-16 13:29:08 +11001057 window = CHAN_SES_WINDOW_DEFAULT;
1058 packetmax = CHAN_SES_PACKET_DEFAULT;
1059 if (!tty_flag) {
Damien Miller1383bd82000-04-06 12:32:37 +10001060 window *= 2;
Damien Millere4340be2000-09-16 13:29:08 +11001061 packetmax *=2;
Damien Miller1383bd82000-04-06 12:32:37 +10001062 }
Damien Miller1383bd82000-04-06 12:32:37 +10001063 id = channel_new(
1064 "session", SSH_CHANNEL_OPENING, in, out, err,
Damien Millere4340be2000-09-16 13:29:08 +11001065 window, packetmax, CHAN_EXTENDED_WRITE,
Damien Miller69b69aa2000-10-28 14:19:58 +11001066 xstrdup("client-session"), /*nonblock*/0);
Damien Miller1383bd82000-04-06 12:32:37 +10001067
Damien Miller1383bd82000-04-06 12:32:37 +10001068 channel_open(id);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001069 channel_register_callback(id, SSH2_MSG_CHANNEL_OPEN_CONFIRMATION,
1070 ssh_session2_callback, (void *)0);
Damien Miller1383bd82000-04-06 12:32:37 +10001071
Damien Millerad833b32000-08-23 10:46:23 +10001072 return client_loop(tty_flag, tty_flag ? options.escape_char : -1, id);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001073}
Damien Miller0bc1bd82000-11-13 22:57:25 +11001074
1075int
1076guess_identity_file_type(const char *filename)
1077{
1078 struct stat st;
1079 Key *public;
1080 int type = KEY_RSA1; /* default */
1081
1082 if (stat(filename, &st) < 0) {
Ben Lindstrom14920292000-11-21 21:24:55 +00001083 /* ignore this key */
Damien Miller0bc1bd82000-11-13 22:57:25 +11001084 return KEY_UNSPEC;
1085 }
1086 public = key_new(type);
1087 if (!load_public_key(filename, public, NULL)) {
1088 /* ok, so we will assume this is 'some' key */
1089 type = KEY_UNSPEC;
1090 }
1091 key_free(public);
1092 return type;
1093}
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001094
1095void
1096load_public_identity_files(void)
1097{
1098 char *filename;
1099 Key *public;
1100 int i;
1101
1102 for (i = 0; i < options.num_identity_files; i++) {
1103 filename = tilde_expand_filename(options.identity_files[i],
1104 original_real_uid);
1105 public = key_new(KEY_RSA1);
1106 if (!load_public_key(filename, public, NULL)) {
1107 key_free(public);
1108 public = key_new(KEY_UNSPEC);
1109 if (!try_load_public_key(filename, public, NULL)) {
1110 debug("unknown identity file %s", filename);
1111 key_free(public);
1112 public = NULL;
1113 }
1114 }
1115 debug("identity file %s type %d", filename,
1116 public ? public->type : -1);
1117 xfree(options.identity_files[i]);
1118 options.identity_files[i] = filename;
1119 options.identity_keys[i] = public;
1120 }
1121}