blob: 484e5de463c50c06a490bcd90ae30de92fdd8173 [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 Lindstrombba81212001-06-25 05:01:22 +000042RCSID("$OpenBSD: ssh.c,v 1.126 2001/06/23 15:12:21 itojun 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"
Ben Lindstromc7637672001-06-09 00:36:26 +000056#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"
Ben Lindstromae8e2d32001-04-14 23:13:02 +000070#include "sshtty.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100071
Damien Miller3f905871999-11-15 17:10:57 +110072#ifdef HAVE___PROGNAME
73extern char *__progname;
Ben Lindstrom49a79c02000-11-17 03:47:20 +000074#else
75char *__progname;
76#endif
Damien Miller3f905871999-11-15 17:10:57 +110077
Damien Miller34132e52000-01-14 15:45:46 +110078/* Flag indicating whether IPv4 or IPv6. This can be set on the command line.
79 Default value is AF_UNSPEC means both IPv4 and IPv6. */
Damien Miller7d80e342000-01-19 14:36:49 +110080#ifdef IPV4_DEFAULT
81int IPv4or6 = AF_INET;
82#else
Damien Miller34132e52000-01-14 15:45:46 +110083int IPv4or6 = AF_UNSPEC;
Damien Miller7d80e342000-01-19 14:36:49 +110084#endif
Damien Miller34132e52000-01-14 15:45:46 +110085
Damien Miller95def091999-11-25 00:26:21 +110086/* Flag indicating whether debug mode is on. This can be set on the command line. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100087int debug_flag = 0;
88
Damien Miller78928792000-04-12 20:17:38 +100089/* Flag indicating whether a tty should be allocated */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100090int tty_flag = 0;
Ben Lindstrom4dccfa52000-12-28 16:40:05 +000091int no_tty_flag = 0;
92int force_tty_flag = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100093
Damien Miller1383bd82000-04-06 12:32:37 +100094/* don't exec a shell */
95int no_shell_flag = 0;
Damien Miller1383bd82000-04-06 12:32:37 +100096
Damien Miller5428f641999-11-25 11:54:57 +110097/*
98 * Flag indicating that nothing should be read from stdin. This can be set
99 * on the command line.
100 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000101int stdin_null_flag = 0;
102
Damien Miller5428f641999-11-25 11:54:57 +1100103/*
104 * Flag indicating that ssh should fork after authentication. This is useful
105 * so that the pasphrase can be entered manually, and then ssh goes to the
106 * background.
107 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000108int fork_after_authentication_flag = 0;
109
Damien Miller5428f641999-11-25 11:54:57 +1100110/*
111 * General data structure for command line options and options configurable
112 * in configuration files. See readconf.h.
113 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000114Options options;
115
Damien Miller5428f641999-11-25 11:54:57 +1100116/*
117 * Name of the host we are connecting to. This is the name given on the
118 * command line, or the HostName specified for the user-supplied name in a
119 * configuration file.
120 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000121char *host;
122
123/* socket address the host resolves to */
Damien Miller34132e52000-01-14 15:45:46 +1100124struct sockaddr_storage hostaddr;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000125
Damien Miller5428f641999-11-25 11:54:57 +1100126/*
127 * Flag to indicate that we have received a window change signal which has
128 * not yet been processed. This will cause a message indicating the new
129 * window size to be sent to the server a little later. This is volatile
130 * because this is updated in a signal handler.
131 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000132volatile int received_window_change_signal = 0;
133
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000134/* Private host keys. */
135struct {
136 Key **keys;
137 int nkeys;
138} sensitive_data;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000139
140/* Original real UID. */
141uid_t original_real_uid;
142
Damien Miller1383bd82000-04-06 12:32:37 +1000143/* command to be executed */
144Buffer command;
145
Damien Miller832562e2001-01-30 09:30:01 +1100146/* Should we execute a command or invoke a subsystem? */
147int subsystem_flag = 0;
148
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000149/* Prints a help message to the user. This function never returns. */
150
Ben Lindstrombba81212001-06-25 05:01:22 +0000151static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000152usage(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000153{
Kevin Stevesec84dc12000-12-13 17:45:15 +0000154 fprintf(stderr, "Usage: %s [options] host [command]\n", __progname);
Damien Miller95def091999-11-25 00:26:21 +1100155 fprintf(stderr, "Options:\n");
156 fprintf(stderr, " -l user Log in using this user name.\n");
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000157 fprintf(stderr, " -n Redirect input from " _PATH_DEVNULL ".\n");
Damien Millerb1715dc2000-05-30 13:44:51 +1000158 fprintf(stderr, " -A Enable authentication agent forwarding.\n");
Ben Lindstrom3b89c5e2001-06-05 20:44:16 +0000159 fprintf(stderr, " -a Disable authentication agent forwarding (default).\n");
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000160#ifdef AFS
Damien Miller95def091999-11-25 00:26:21 +1100161 fprintf(stderr, " -k Disable Kerberos ticket and AFS token forwarding.\n");
162#endif /* AFS */
Kevin Stevesef4eea92001-02-05 12:42:17 +0000163 fprintf(stderr, " -X Enable X11 connection forwarding.\n");
Ben Lindstrom3b89c5e2001-06-05 20:44:16 +0000164 fprintf(stderr, " -x Disable X11 connection forwarding (default).\n");
Ben Lindstrom0ab2a012001-03-05 06:45:21 +0000165 fprintf(stderr, " -i file Identity for public key authentication "
166 "(default: ~/.ssh/identity)\n");
Damien Miller95def091999-11-25 00:26:21 +1100167 fprintf(stderr, " -t Tty; allocate a tty even if command is given.\n");
Damien Miller1383bd82000-04-06 12:32:37 +1000168 fprintf(stderr, " -T Do not allocate a tty.\n");
Damien Miller95def091999-11-25 00:26:21 +1100169 fprintf(stderr, " -v Verbose; display verbose debugging messages.\n");
Damien Millere4340be2000-09-16 13:29:08 +1100170 fprintf(stderr, " Multiple -v increases verbosity.\n");
Damien Miller95def091999-11-25 00:26:21 +1100171 fprintf(stderr, " -V Display version number only.\n");
172 fprintf(stderr, " -P Don't allocate a privileged port.\n");
173 fprintf(stderr, " -q Quiet; don't display any warning messages.\n");
174 fprintf(stderr, " -f Fork into background after authentication.\n");
175 fprintf(stderr, " -e char Set escape character; ``none'' = disable (default: ~).\n");
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000176
Ben Lindstrom3b89c5e2001-06-05 20:44:16 +0000177 fprintf(stderr, " -c cipher Select encryption algorithm\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");
Ben Lindstrom3b89c5e2001-06-05 20:44:16 +0000193 fprintf(stderr, " -b addr Local IP address.\n");
Damien Miller95def091999-11-25 00:26:21 +1100194 exit(1);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000195}
196
Damien Miller95def091999-11-25 00:26:21 +1100197/*
198 * Connects to the given host using rsh (or prints an error message and exits
199 * if rsh is not available). This function never returns.
200 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000201static void
Damien Miller95def091999-11-25 00:26:21 +1100202rsh_connect(char *host, char *user, Buffer * command)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000203{
Damien Miller95def091999-11-25 00:26:21 +1100204 char *args[10];
205 int i;
206
207 log("Using rsh. WARNING: Connection will not be encrypted.");
208 /* Build argument list for rsh. */
209 i = 0;
210 args[i++] = _PATH_RSH;
211 /* host may have to come after user on some systems */
212 args[i++] = host;
213 if (user) {
214 args[i++] = "-l";
215 args[i++] = user;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000216 }
Damien Miller95def091999-11-25 00:26:21 +1100217 if (buffer_len(command) > 0) {
218 buffer_append(command, "\0", 1);
219 args[i++] = buffer_ptr(command);
220 }
221 args[i++] = NULL;
222 if (debug_flag) {
223 for (i = 0; args[i]; i++) {
224 if (i != 0)
225 fprintf(stderr, " ");
226 fprintf(stderr, "%s", args[i]);
227 }
228 fprintf(stderr, "\n");
229 }
230 execv(_PATH_RSH, args);
231 perror(_PATH_RSH);
232 exit(1);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000233}
234
Ben Lindstrombba81212001-06-25 05:01:22 +0000235static int ssh_session(void);
236static int ssh_session2(void);
237static void load_public_identity_files(void);
Damien Miller1383bd82000-04-06 12:32:37 +1000238
Damien Miller95def091999-11-25 00:26:21 +1100239/*
240 * Main program for the ssh client.
241 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000242int
243main(int ac, char **av)
244{
Damien Miller1383bd82000-04-06 12:32:37 +1000245 int i, opt, optind, exit_status, ok;
Damien Milleraae6c611999-12-06 11:47:28 +1100246 u_short fwd_port, fwd_host_port;
Ben Lindstrom6ab64862001-06-25 04:26:55 +0000247 char *optarg, *p, *cp, buf[256];
Damien Miller95def091999-11-25 00:26:21 +1100248 struct stat st;
Ben Lindstrom086cf212001-03-05 05:56:40 +0000249 struct passwd *pw;
Damien Miller1383bd82000-04-06 12:32:37 +1000250 int dummy;
Damien Miller95def091999-11-25 00:26:21 +1100251 uid_t original_effective_uid;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000252
Ben Lindstrom49a79c02000-11-17 03:47:20 +0000253 __progname = get_progname(av[0]);
Damien Millerf9b625c2000-07-09 22:42:32 +1000254 init_rng();
255
Damien Miller5428f641999-11-25 11:54:57 +1100256 /*
257 * Save the original real uid. It will be needed later (uid-swapping
258 * may clobber the real uid).
259 */
Damien Miller95def091999-11-25 00:26:21 +1100260 original_real_uid = getuid();
261 original_effective_uid = geteuid();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000262
Damien Miller05dd7952000-10-01 00:42:48 +1100263#ifdef HAVE_SETRLIMIT
Damien Miller95def091999-11-25 00:26:21 +1100264 /* If we are installed setuid root be careful to not drop core. */
265 if (original_real_uid != original_effective_uid) {
266 struct rlimit rlim;
267 rlim.rlim_cur = rlim.rlim_max = 0;
268 if (setrlimit(RLIMIT_CORE, &rlim) < 0)
269 fatal("setrlimit failed: %.100s", strerror(errno));
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000270 }
Damien Millerbac2d8a2000-09-05 16:13:06 +1100271#endif
Ben Lindstrom3fcf1a22001-04-08 18:26:59 +0000272 /* Get user data. */
273 pw = getpwuid(original_real_uid);
274 if (!pw) {
275 log("You don't exist, go away!");
276 exit(1);
277 }
278 /* Take a copy of the returned structure. */
279 pw = pwcopy(pw);
280
Damien Miller5428f641999-11-25 11:54:57 +1100281 /*
282 * Use uid-swapping to give up root privileges for the duration of
283 * option processing. We will re-instantiate the rights when we are
284 * ready to create the privileged port, and will permanently drop
285 * them when the port has been created (actually, when the connection
286 * has been made, as we may need to create the port several times).
287 */
Ben Lindstrom3fcf1a22001-04-08 18:26:59 +0000288 temporarily_use_uid(pw);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000289
Damien Miller5428f641999-11-25 11:54:57 +1100290 /*
291 * Set our umask to something reasonable, as some files are created
292 * with the default umask. This will make them world-readable but
293 * writable only by the owner, which is ok for all files for which we
294 * don't set the modes explicitly.
295 */
Damien Miller95def091999-11-25 00:26:21 +1100296 umask(022);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000297
Damien Miller95def091999-11-25 00:26:21 +1100298 /* Initialize option structure to indicate that no values have been set. */
299 initialize_options(&options);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000300
Damien Miller95def091999-11-25 00:26:21 +1100301 /* Parse command-line arguments. */
302 host = NULL;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000303
Damien Miller95def091999-11-25 00:26:21 +1100304 for (optind = 1; optind < ac; optind++) {
305 if (av[optind][0] != '-') {
306 if (host)
307 break;
Ben Lindstrom6ab64862001-06-25 04:26:55 +0000308 if (strchr(av[optind], '@')) {
309 p = xstrdup(av[optind]);
310 cp = strchr(p, '@');
311 if(cp == NULL || cp == p)
Damien Miller4af51302000-04-16 11:18:38 +1000312 usage();
Ben Lindstrom6ab64862001-06-25 04:26:55 +0000313 options.user = p;
Damien Miller95def091999-11-25 00:26:21 +1100314 *cp = '\0';
315 host = ++cp;
316 } else
317 host = av[optind];
318 continue;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000319 }
Damien Miller95def091999-11-25 00:26:21 +1100320 opt = av[optind][1];
321 if (!opt)
322 usage();
Ben Lindstrome0f88042001-04-30 13:06:24 +0000323 if (strchr("eilcmpbLRDo", opt)) { /* options with arguments */
Damien Miller95def091999-11-25 00:26:21 +1100324 optarg = av[optind] + 2;
325 if (strcmp(optarg, "") == 0) {
326 if (optind >= ac - 1)
327 usage();
328 optarg = av[++optind];
329 }
330 } else {
331 if (av[optind][2])
332 usage();
333 optarg = NULL;
334 }
335 switch (opt) {
Ben Lindstrom1e7d3062001-02-09 02:36:43 +0000336 case '1':
337 options.protocol = SSH_PROTO_1;
338 break;
Damien Miller4af51302000-04-16 11:18:38 +1000339 case '2':
340 options.protocol = SSH_PROTO_2;
341 break;
Damien Miller34132e52000-01-14 15:45:46 +1100342 case '4':
343 IPv4or6 = AF_INET;
344 break;
Damien Miller34132e52000-01-14 15:45:46 +1100345 case '6':
346 IPv4or6 = AF_INET6;
347 break;
Damien Miller95def091999-11-25 00:26:21 +1100348 case 'n':
349 stdin_null_flag = 1;
350 break;
Damien Miller95def091999-11-25 00:26:21 +1100351 case 'f':
352 fork_after_authentication_flag = 1;
353 stdin_null_flag = 1;
354 break;
Damien Miller95def091999-11-25 00:26:21 +1100355 case 'x':
356 options.forward_x11 = 0;
357 break;
Damien Miller95def091999-11-25 00:26:21 +1100358 case 'X':
359 options.forward_x11 = 1;
360 break;
Damien Miller95def091999-11-25 00:26:21 +1100361 case 'g':
362 options.gateway_ports = 1;
363 break;
Damien Miller95def091999-11-25 00:26:21 +1100364 case 'P':
365 options.use_privileged_port = 0;
366 break;
Damien Miller95def091999-11-25 00:26:21 +1100367 case 'a':
368 options.forward_agent = 0;
369 break;
Damien Millerb1715dc2000-05-30 13:44:51 +1000370 case 'A':
371 options.forward_agent = 1;
372 break;
Damien Miller95def091999-11-25 00:26:21 +1100373#ifdef AFS
374 case 'k':
375 options.kerberos_tgt_passing = 0;
376 options.afs_token_passing = 0;
377 break;
378#endif
379 case 'i':
380 if (stat(optarg, &st) < 0) {
381 fprintf(stderr, "Warning: Identity file %s does not exist.\n",
Damien Miller0bc1bd82000-11-13 22:57:25 +1100382 optarg);
Damien Miller95def091999-11-25 00:26:21 +1100383 break;
384 }
385 if (options.num_identity_files >= SSH_MAX_IDENTITY_FILES)
386 fatal("Too many identity files specified (max %d)",
Damien Miller0bc1bd82000-11-13 22:57:25 +1100387 SSH_MAX_IDENTITY_FILES);
388 options.identity_files[options.num_identity_files++] = xstrdup(optarg);
Damien Miller95def091999-11-25 00:26:21 +1100389 break;
Damien Miller95def091999-11-25 00:26:21 +1100390 case 't':
Ben Lindstrom4dccfa52000-12-28 16:40:05 +0000391 if (tty_flag)
392 force_tty_flag = 1;
Damien Miller95def091999-11-25 00:26:21 +1100393 tty_flag = 1;
394 break;
Damien Miller95def091999-11-25 00:26:21 +1100395 case 'v':
Damien Millere4340be2000-09-16 13:29:08 +1100396 if (0 == debug_flag) {
397 debug_flag = 1;
398 options.log_level = SYSLOG_LEVEL_DEBUG1;
399 } else if (options.log_level < SYSLOG_LEVEL_DEBUG3) {
400 options.log_level++;
401 break;
402 } else {
Ben Lindstrom6df8ef42001-03-05 07:47:23 +0000403 fatal("Too high debugging level.");
Damien Millere4340be2000-09-16 13:29:08 +1100404 }
405 /* fallthrough */
Damien Miller95def091999-11-25 00:26:21 +1100406 case 'V':
Damien Miller225736c2001-02-19 21:51:08 +1100407 fprintf(stderr,
408 "%s, SSH protocols %d.%d/%d.%d, OpenSSL 0x%8.8lx\n",
Damien Miller78928792000-04-12 20:17:38 +1000409 SSH_VERSION,
410 PROTOCOL_MAJOR_1, PROTOCOL_MINOR_1,
Damien Miller225736c2001-02-19 21:51:08 +1100411 PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2,
412 SSLeay());
Damien Miller95def091999-11-25 00:26:21 +1100413 if (opt == 'V')
414 exit(0);
Damien Miller95def091999-11-25 00:26:21 +1100415 break;
Damien Miller95def091999-11-25 00:26:21 +1100416 case 'q':
417 options.log_level = SYSLOG_LEVEL_QUIET;
418 break;
Damien Miller95def091999-11-25 00:26:21 +1100419 case 'e':
420 if (optarg[0] == '^' && optarg[2] == 0 &&
Ben Lindstrom46c16222000-12-22 01:43:59 +0000421 (u_char) optarg[1] >= 64 && (u_char) optarg[1] < 128)
422 options.escape_char = (u_char) optarg[1] & 31;
Damien Miller95def091999-11-25 00:26:21 +1100423 else if (strlen(optarg) == 1)
Ben Lindstrom46c16222000-12-22 01:43:59 +0000424 options.escape_char = (u_char) optarg[0];
Damien Miller95def091999-11-25 00:26:21 +1100425 else if (strcmp(optarg, "none") == 0)
Ben Lindstrom2b1f71b2001-06-05 20:32:21 +0000426 options.escape_char = SSH_ESCAPECHAR_NONE;
Damien Miller95def091999-11-25 00:26:21 +1100427 else {
428 fprintf(stderr, "Bad escape character '%s'.\n", optarg);
429 exit(1);
430 }
431 break;
Damien Miller95def091999-11-25 00:26:21 +1100432 case 'c':
Damien Millereba71ba2000-04-29 23:57:08 +1000433 if (ciphers_valid(optarg)) {
434 /* SSH2 only */
435 options.ciphers = xstrdup(optarg);
Damien Miller30c3d422000-05-09 11:02:59 +1000436 options.cipher = SSH_CIPHER_ILLEGAL;
Damien Millereba71ba2000-04-29 23:57:08 +1000437 } else {
438 /* SSH1 only */
Damien Millere39cacc2000-11-29 12:18:44 +1100439 options.cipher = cipher_number(optarg);
440 if (options.cipher == -1) {
Damien Millereba71ba2000-04-29 23:57:08 +1000441 fprintf(stderr, "Unknown cipher type '%s'\n", optarg);
442 exit(1);
443 }
Damien Millere39cacc2000-11-29 12:18:44 +1100444 if (options.cipher == SSH_CIPHER_3DES) {
445 options.ciphers = "3des-cbc";
446 } else if (options.cipher == SSH_CIPHER_BLOWFISH) {
447 options.ciphers = "blowfish-cbc";
448 } else {
449 options.ciphers = (char *)-1;
450 }
Damien Miller95def091999-11-25 00:26:21 +1100451 }
452 break;
Ben Lindstrom06b33aa2001-02-15 03:01:59 +0000453 case 'm':
454 if (mac_valid(optarg))
455 options.macs = xstrdup(optarg);
456 else {
457 fprintf(stderr, "Unknown mac type '%s'\n", optarg);
458 exit(1);
459 }
460 break;
Damien Miller95def091999-11-25 00:26:21 +1100461 case 'p':
Ben Lindstrom19066a12001-04-12 23:39:26 +0000462 options.port = a2port(optarg);
463 if (options.port == 0) {
Ben Lindstrom146edb92001-04-11 23:06:28 +0000464 fprintf(stderr, "Bad port '%s'\n", optarg);
465 exit(1);
466 }
Damien Miller95def091999-11-25 00:26:21 +1100467 break;
Damien Miller95def091999-11-25 00:26:21 +1100468 case 'l':
469 options.user = optarg;
470 break;
Damien Miller95def091999-11-25 00:26:21 +1100471 case 'R':
Damien Miller34132e52000-01-14 15:45:46 +1100472 if (sscanf(optarg, "%hu/%255[^/]/%hu", &fwd_port, buf,
473 &fwd_host_port) != 3 &&
474 sscanf(optarg, "%hu:%255[^:]:%hu", &fwd_port, buf,
475 &fwd_host_port) != 3) {
Damien Miller95def091999-11-25 00:26:21 +1100476 fprintf(stderr, "Bad forwarding specification '%s'.\n", optarg);
477 usage();
478 /* NOTREACHED */
479 }
480 add_remote_forward(&options, fwd_port, buf, fwd_host_port);
481 break;
Damien Miller95def091999-11-25 00:26:21 +1100482 case 'L':
Damien Miller34132e52000-01-14 15:45:46 +1100483 if (sscanf(optarg, "%hu/%255[^/]/%hu", &fwd_port, buf,
484 &fwd_host_port) != 3 &&
485 sscanf(optarg, "%hu:%255[^:]:%hu", &fwd_port, buf,
486 &fwd_host_port) != 3) {
Damien Miller95def091999-11-25 00:26:21 +1100487 fprintf(stderr, "Bad forwarding specification '%s'.\n", optarg);
488 usage();
489 /* NOTREACHED */
490 }
491 add_local_forward(&options, fwd_port, buf, fwd_host_port);
492 break;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000493
494 case 'D':
Ben Lindstrom19066a12001-04-12 23:39:26 +0000495 fwd_port = a2port(optarg);
496 if (fwd_port == 0) {
497 fprintf(stderr, "Bad dynamic port '%s'\n", optarg);
Ben Lindstrom146edb92001-04-11 23:06:28 +0000498 exit(1);
499 }
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000500 add_local_forward(&options, fwd_port, "socks4", 0);
501 break;
502
Damien Miller95def091999-11-25 00:26:21 +1100503 case 'C':
504 options.compression = 1;
505 break;
Damien Miller1383bd82000-04-06 12:32:37 +1000506 case 'N':
507 no_shell_flag = 1;
508 no_tty_flag = 1;
509 break;
Damien Miller1383bd82000-04-06 12:32:37 +1000510 case 'T':
511 no_tty_flag = 1;
512 break;
Damien Miller95def091999-11-25 00:26:21 +1100513 case 'o':
514 dummy = 1;
515 if (process_config_line(&options, host ? host : "", optarg,
516 "command-line", 0, &dummy) != 0)
517 exit(1);
518 break;
Damien Miller832562e2001-01-30 09:30:01 +1100519 case 's':
520 subsystem_flag = 1;
521 break;
Ben Lindstrome0f88042001-04-30 13:06:24 +0000522 case 'b':
523 options.bind_address = optarg;
524 break;
Damien Miller95def091999-11-25 00:26:21 +1100525 default:
526 usage();
527 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000528 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000529
Damien Miller95def091999-11-25 00:26:21 +1100530 /* Check that we got a host name. */
531 if (!host)
532 usage();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000533
Damien Millercb5e44a2000-09-29 12:12:36 +1100534 SSLeay_add_all_algorithms();
Damien Miller0bc1bd82000-11-13 22:57:25 +1100535 ERR_load_crypto_strings();
Damien Millercb5e44a2000-09-29 12:12:36 +1100536
Damien Miller95def091999-11-25 00:26:21 +1100537 /* Initialize the command to execute on remote host. */
538 buffer_init(&command);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000539
Damien Miller5428f641999-11-25 11:54:57 +1100540 /*
541 * Save the command to execute on the remote host in a buffer. There
542 * is no limit on the length of the command, except by the maximum
543 * packet size. Also sets the tty flag if there is no command.
544 */
Damien Miller95def091999-11-25 00:26:21 +1100545 if (optind == ac) {
546 /* No command specified - execute shell on a tty. */
547 tty_flag = 1;
Damien Miller832562e2001-01-30 09:30:01 +1100548 if (subsystem_flag) {
Ben Lindstrom92d4a022001-04-13 04:44:37 +0000549 fprintf(stderr, "You must specify a subsystem to invoke.\n");
Damien Miller832562e2001-01-30 09:30:01 +1100550 usage();
551 }
Damien Miller95def091999-11-25 00:26:21 +1100552 } else {
553 /* A command has been specified. Store it into the
554 buffer. */
555 for (i = optind; i < ac; i++) {
556 if (i > optind)
557 buffer_append(&command, " ", 1);
558 buffer_append(&command, av[i], strlen(av[i]));
559 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000560 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000561
Damien Miller95def091999-11-25 00:26:21 +1100562 /* Cannot fork to background if no command. */
Damien Millercaf6dd62000-08-29 11:33:50 +1100563 if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag)
Damien Miller95def091999-11-25 00:26:21 +1100564 fatal("Cannot fork into background without a command to execute.");
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000565
Damien Miller95def091999-11-25 00:26:21 +1100566 /* Allocate a tty by default if no command specified. */
567 if (buffer_len(&command) == 0)
568 tty_flag = 1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000569
Ben Lindstromc72745a2000-12-02 19:03:54 +0000570 /* Force no tty*/
571 if (no_tty_flag)
572 tty_flag = 0;
Damien Miller95def091999-11-25 00:26:21 +1100573 /* Do not allocate a tty if stdin is not a tty. */
Ben Lindstrom4dccfa52000-12-28 16:40:05 +0000574 if (!isatty(fileno(stdin)) && !force_tty_flag) {
Damien Miller95def091999-11-25 00:26:21 +1100575 if (tty_flag)
Ben Lindstrom6df8ef42001-03-05 07:47:23 +0000576 log("Pseudo-terminal will not be allocated because stdin is not a terminal.");
Damien Miller95def091999-11-25 00:26:21 +1100577 tty_flag = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000578 }
Damien Miller1383bd82000-04-06 12:32:37 +1000579
Ben Lindstrom8a432f52001-03-05 07:24:46 +0000580 /*
581 * Initialize "log" output. Since we are the client all output
582 * actually goes to stderr.
583 */
Ben Lindstrom2b646522001-04-12 16:16:57 +0000584 log_init(av[0], options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level,
585 SYSLOG_FACILITY_USER, 1);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000586
Damien Miller95def091999-11-25 00:26:21 +1100587 /* Read per-user configuration file. */
Ben Lindstrom226cfa02001-01-22 05:34:40 +0000588 snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, _PATH_SSH_USER_CONFFILE);
Damien Miller95def091999-11-25 00:26:21 +1100589 read_config_file(buf, host, &options);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000590
Damien Miller95def091999-11-25 00:26:21 +1100591 /* Read systemwide configuration file. */
Ben Lindstrom226cfa02001-01-22 05:34:40 +0000592 read_config_file(_PATH_HOST_CONFIG_FILE, host, &options);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000593
Damien Miller95def091999-11-25 00:26:21 +1100594 /* Fill configuration defaults. */
595 fill_default_options(&options);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000596
Damien Miller95def091999-11-25 00:26:21 +1100597 /* reinit */
Ben Lindstrom8a432f52001-03-05 07:24:46 +0000598 log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 1);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000599
Damien Miller60bc5172001-03-19 09:38:15 +1100600 seed_rng();
601
Damien Miller95def091999-11-25 00:26:21 +1100602 if (options.user == NULL)
603 options.user = xstrdup(pw->pw_name);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000604
Damien Miller95def091999-11-25 00:26:21 +1100605 if (options.hostname != NULL)
606 host = options.hostname;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000607
Damien Miller95def091999-11-25 00:26:21 +1100608 /* Disable rhosts authentication if not running as root. */
Damien Millerbac2d8a2000-09-05 16:13:06 +1100609#ifdef HAVE_CYGWIN
610 /* Ignore uid if running under Windows */
611 if (!options.use_privileged_port) {
612#else
Damien Miller95def091999-11-25 00:26:21 +1100613 if (original_effective_uid != 0 || !options.use_privileged_port) {
Damien Millerbac2d8a2000-09-05 16:13:06 +1100614#endif
Kevin Stevesfcec7f82000-12-15 19:55:48 +0000615 debug("Rhosts Authentication disabled, "
616 "originating port will not be trusted.");
Damien Miller95def091999-11-25 00:26:21 +1100617 options.rhosts_authentication = 0;
Damien Miller95def091999-11-25 00:26:21 +1100618 }
Ben Lindstrom3fcf1a22001-04-08 18:26:59 +0000619
Damien Miller5428f641999-11-25 11:54:57 +1100620 /*
621 * If using rsh has been selected, exec it now (without trying
622 * anything else). Note that we must release privileges first.
623 */
Damien Miller95def091999-11-25 00:26:21 +1100624 if (options.use_rsh) {
Damien Miller5428f641999-11-25 11:54:57 +1100625 /*
626 * Restore our superuser privileges. This must be done
627 * before permanently setting the uid.
628 */
Damien Miller95def091999-11-25 00:26:21 +1100629 restore_uid();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000630
Damien Miller95def091999-11-25 00:26:21 +1100631 /* Switch to the original uid permanently. */
Ben Lindstrom3fcf1a22001-04-08 18:26:59 +0000632 permanently_set_uid(pw);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000633
Damien Miller95def091999-11-25 00:26:21 +1100634 /* Execute rsh. */
635 rsh_connect(host, options.user, &command);
636 fatal("rsh_connect returned");
637 }
638 /* Restore our superuser privileges. */
639 restore_uid();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000640
Kevin Stevesfcec7f82000-12-15 19:55:48 +0000641 /* Open a connection to the remote host. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000642
Damien Miller95def091999-11-25 00:26:21 +1100643 ok = ssh_connect(host, &hostaddr, options.port,
Kevin Stevesfcec7f82000-12-15 19:55:48 +0000644 options.connection_attempts,
645 original_effective_uid != 0 || !options.use_privileged_port,
Ben Lindstrom3fcf1a22001-04-08 18:26:59 +0000646 pw, options.proxy_command);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000647
Damien Miller5428f641999-11-25 11:54:57 +1100648 /*
649 * If we successfully made the connection, load the host private key
650 * in case we will need it later for combined rsa-rhosts
651 * authentication. This must be done before releasing extra
652 * privileges, because the file is only readable by root.
653 */
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000654 sensitive_data.nkeys = 0;
655 sensitive_data.keys = NULL;
656 if (ok && (options.rhosts_rsa_authentication ||
657 options.hostbased_authentication)) {
658 sensitive_data.nkeys = 3;
659 sensitive_data.keys = xmalloc(sensitive_data.nkeys*sizeof(Key));
660 sensitive_data.keys[0] = key_load_private_type(KEY_RSA1,
Ben Lindstromd0fca422001-03-26 13:44:06 +0000661 _PATH_HOST_KEY_FILE, "", NULL);
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000662 sensitive_data.keys[1] = key_load_private_type(KEY_DSA,
663 _PATH_HOST_DSA_KEY_FILE, "", NULL);
664 sensitive_data.keys[2] = key_load_private_type(KEY_RSA,
665 _PATH_HOST_RSA_KEY_FILE, "", NULL);
Damien Miller95def091999-11-25 00:26:21 +1100666 }
Damien Miller5428f641999-11-25 11:54:57 +1100667 /*
668 * Get rid of any extra privileges that we may have. We will no
669 * longer need them. Also, extra privileges could make it very hard
670 * to read identity files and other non-world-readable files from the
671 * user's home directory if it happens to be on a NFS volume where
672 * root is mapped to nobody.
673 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000674
Damien Miller5428f641999-11-25 11:54:57 +1100675 /*
676 * Note that some legacy systems need to postpone the following call
677 * to permanently_set_uid() until the private hostkey is destroyed
678 * with RSA_free(). Otherwise the calling user could ptrace() the
679 * process, read the private hostkey and impersonate the host.
680 * OpenBSD does not allow ptracing of setuid processes.
681 */
Ben Lindstrom3fcf1a22001-04-08 18:26:59 +0000682 permanently_set_uid(pw);
Damien Miller95def091999-11-25 00:26:21 +1100683
Damien Miller5428f641999-11-25 11:54:57 +1100684 /*
685 * Now that we are back to our own permissions, create ~/.ssh
686 * directory if it doesn\'t already exist.
687 */
Ben Lindstrom226cfa02001-01-22 05:34:40 +0000688 snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, _PATH_SSH_USER_DIR);
Damien Miller95def091999-11-25 00:26:21 +1100689 if (stat(buf, &st) < 0)
Damien Millerbe484b52000-07-15 14:14:16 +1000690 if (mkdir(buf, 0700) < 0)
Damien Miller95def091999-11-25 00:26:21 +1100691 error("Could not create directory '%.200s'.", buf);
692
693 /* Check if the connection failed, and try "rsh" if appropriate. */
694 if (!ok) {
695 if (options.port != 0)
Damien Milleraae6c611999-12-06 11:47:28 +1100696 log("Secure connection to %.100s on port %hu refused%.100s.",
Damien Miller95def091999-11-25 00:26:21 +1100697 host, options.port,
698 options.fallback_to_rsh ? "; reverting to insecure method" : "");
699 else
700 log("Secure connection to %.100s refused%.100s.", host,
701 options.fallback_to_rsh ? "; reverting to insecure method" : "");
702
703 if (options.fallback_to_rsh) {
704 rsh_connect(host, options.user, &command);
705 fatal("rsh_connect returned");
706 }
707 exit(1);
708 }
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000709 /* load options.identity_files */
710 load_public_identity_files();
711
712 /* Expand ~ in known host file names. */
713 /* XXX mem-leaks: */
Damien Miller0bc1bd82000-11-13 22:57:25 +1100714 options.system_hostfile =
715 tilde_expand_filename(options.system_hostfile, original_real_uid);
716 options.user_hostfile =
717 tilde_expand_filename(options.user_hostfile, original_real_uid);
718 options.system_hostfile2 =
719 tilde_expand_filename(options.system_hostfile2, original_real_uid);
720 options.user_hostfile2 =
721 tilde_expand_filename(options.user_hostfile2, original_real_uid);
Damien Miller95def091999-11-25 00:26:21 +1100722
723 /* Log into the remote system. This never returns if the login fails. */
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000724 ssh_login(sensitive_data.keys, sensitive_data.nkeys,
725 host, (struct sockaddr *)&hostaddr, pw);
Damien Miller95def091999-11-25 00:26:21 +1100726
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000727 /* We no longer need the private host keys. Clear them now. */
728 if (sensitive_data.nkeys != 0) {
729 for (i = 0; i < sensitive_data.nkeys; i++) {
730 if (sensitive_data.keys[i] != NULL) {
731 /* Destroys contents safely */
732 debug3("clear hostkey %d", i);
733 key_free(sensitive_data.keys[i]);
734 sensitive_data.keys[i] = NULL;
735 }
736 }
737 xfree(sensitive_data.keys);
738 }
Damien Miller95def091999-11-25 00:26:21 +1100739
Damien Miller1383bd82000-04-06 12:32:37 +1000740 exit_status = compat20 ? ssh_session2() : ssh_session();
741 packet_close();
742 return exit_status;
743}
744
Ben Lindstrombba81212001-06-25 05:01:22 +0000745static void
Damien Millerbd483e72000-04-30 10:00:53 +1000746x11_get_proto(char *proto, int proto_len, char *data, int data_len)
747{
748 char line[512];
749 FILE *f;
750 int got_data = 0, i;
751
Damien Millerd3a18572000-06-07 19:55:44 +1000752 if (options.xauth_location) {
753 /* Try to get Xauthority information for the display. */
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000754 snprintf(line, sizeof line, "%.100s list %.200s 2>" _PATH_DEVNULL,
Damien Millerd3a18572000-06-07 19:55:44 +1000755 options.xauth_location, getenv("DISPLAY"));
756 f = popen(line, "r");
757 if (f && fgets(line, sizeof(line), f) &&
758 sscanf(line, "%*s %s %s", proto, data) == 2)
759 got_data = 1;
760 if (f)
761 pclose(f);
762 }
Damien Millerbd483e72000-04-30 10:00:53 +1000763 /*
764 * If we didn't get authentication data, just make up some
765 * data. The forwarding code will check the validity of the
766 * response anyway, and substitute this data. The X11
767 * server, however, will ignore this fake data and use
768 * whatever authentication mechanisms it was using otherwise
769 * for the local connection.
770 */
771 if (!got_data) {
772 u_int32_t rand = 0;
773
774 strlcpy(proto, "MIT-MAGIC-COOKIE-1", proto_len);
775 for (i = 0; i < 16; i++) {
776 if (i % 4 == 0)
777 rand = arc4random();
778 snprintf(data + 2 * i, data_len - 2 * i, "%02x", rand & 0xff);
779 rand >>= 8;
780 }
781 }
782}
783
Ben Lindstrombba81212001-06-25 05:01:22 +0000784static void
Damien Miller0bc1bd82000-11-13 22:57:25 +1100785ssh_init_forwarding(void)
786{
Kevin Steves12057502001-02-05 14:54:34 +0000787 int success = 0;
Damien Miller0bc1bd82000-11-13 22:57:25 +1100788 int i;
Kevin Steves12057502001-02-05 14:54:34 +0000789
Damien Miller0bc1bd82000-11-13 22:57:25 +1100790 /* Initiate local TCP/IP port forwardings. */
791 for (i = 0; i < options.num_local_forwards; i++) {
792 debug("Connections to local port %d forwarded to remote address %.200s:%d",
793 options.local_forwards[i].port,
794 options.local_forwards[i].host,
795 options.local_forwards[i].host_port);
Kevin Steves12057502001-02-05 14:54:34 +0000796 success += channel_request_local_forwarding(
Damien Miller0bc1bd82000-11-13 22:57:25 +1100797 options.local_forwards[i].port,
798 options.local_forwards[i].host,
799 options.local_forwards[i].host_port,
800 options.gateway_ports);
801 }
Kevin Steves12057502001-02-05 14:54:34 +0000802 if (i > 0 && success == 0)
803 error("Could not request local forwarding.");
Damien Miller0bc1bd82000-11-13 22:57:25 +1100804
805 /* Initiate remote TCP/IP port forwardings. */
806 for (i = 0; i < options.num_remote_forwards; i++) {
807 debug("Connections to remote port %d forwarded to local address %.200s:%d",
808 options.remote_forwards[i].port,
809 options.remote_forwards[i].host,
810 options.remote_forwards[i].host_port);
811 channel_request_remote_forwarding(
812 options.remote_forwards[i].port,
813 options.remote_forwards[i].host,
814 options.remote_forwards[i].host_port);
815 }
816}
817
Ben Lindstrombba81212001-06-25 05:01:22 +0000818static void
Damien Miller0bc1bd82000-11-13 22:57:25 +1100819check_agent_present(void)
820{
821 if (options.forward_agent) {
822 /* Clear agent forwarding if we don\'t have an agent. */
823 int authfd = ssh_get_authentication_socket();
824 if (authfd < 0)
825 options.forward_agent = 0;
826 else
827 ssh_close_authentication_socket(authfd);
828 }
829}
830
Ben Lindstrombba81212001-06-25 05:01:22 +0000831static int
Damien Miller1383bd82000-04-06 12:32:37 +1000832ssh_session(void)
833{
834 int type;
Damien Miller1383bd82000-04-06 12:32:37 +1000835 int plen;
836 int interactive = 0;
837 int have_tty = 0;
838 struct winsize ws;
Damien Miller1383bd82000-04-06 12:32:37 +1000839 char *cp;
840
Damien Miller95def091999-11-25 00:26:21 +1100841 /* Enable compression if requested. */
842 if (options.compression) {
843 debug("Requesting compression at level %d.", options.compression_level);
844
845 if (options.compression_level < 1 || options.compression_level > 9)
846 fatal("Compression level must be from 1 (fast) to 9 (slow, best).");
847
848 /* Send the request. */
849 packet_start(SSH_CMSG_REQUEST_COMPRESSION);
850 packet_put_int(options.compression_level);
851 packet_send();
852 packet_write_wait();
853 type = packet_read(&plen);
854 if (type == SSH_SMSG_SUCCESS)
855 packet_start_compression(options.compression_level);
856 else if (type == SSH_SMSG_FAILURE)
857 log("Warning: Remote host refused compression.");
858 else
859 packet_disconnect("Protocol error waiting for compression response.");
860 }
861 /* Allocate a pseudo tty if appropriate. */
862 if (tty_flag) {
863 debug("Requesting pty.");
864
865 /* Start the packet. */
866 packet_start(SSH_CMSG_REQUEST_PTY);
867
868 /* Store TERM in the packet. There is no limit on the
869 length of the string. */
870 cp = getenv("TERM");
871 if (!cp)
872 cp = "";
Ben Lindstrom664408d2001-06-09 01:42:01 +0000873 packet_put_cstring(cp);
Damien Miller95def091999-11-25 00:26:21 +1100874
875 /* Store window size in the packet. */
876 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
877 memset(&ws, 0, sizeof(ws));
878 packet_put_int(ws.ws_row);
879 packet_put_int(ws.ws_col);
880 packet_put_int(ws.ws_xpixel);
881 packet_put_int(ws.ws_ypixel);
882
883 /* Store tty modes in the packet. */
Ben Lindstromae8e2d32001-04-14 23:13:02 +0000884 tty_make_modes(fileno(stdin), NULL);
Damien Miller95def091999-11-25 00:26:21 +1100885
886 /* Send the packet, and wait for it to leave. */
887 packet_send();
888 packet_write_wait();
889
890 /* Read response from the server. */
891 type = packet_read(&plen);
Damien Miller450a7a12000-03-26 13:04:51 +1000892 if (type == SSH_SMSG_SUCCESS) {
Damien Miller95def091999-11-25 00:26:21 +1100893 interactive = 1;
Damien Miller1383bd82000-04-06 12:32:37 +1000894 have_tty = 1;
Damien Miller450a7a12000-03-26 13:04:51 +1000895 } else if (type == SSH_SMSG_FAILURE)
Damien Miller95def091999-11-25 00:26:21 +1100896 log("Warning: Remote host failed or refused to allocate a pseudo tty.");
897 else
898 packet_disconnect("Protocol error waiting for pty request response.");
899 }
900 /* Request X11 forwarding if enabled and DISPLAY is set. */
901 if (options.forward_x11 && getenv("DISPLAY") != NULL) {
Damien Millerbd483e72000-04-30 10:00:53 +1000902 char proto[512], data[512];
903 /* Get reasonable local authentication information. */
904 x11_get_proto(proto, sizeof proto, data, sizeof data);
905 /* Request forwarding with authentication spoofing. */
Damien Miller95def091999-11-25 00:26:21 +1100906 debug("Requesting X11 forwarding with authentication spoofing.");
Damien Millerbd483e72000-04-30 10:00:53 +1000907 x11_request_forwarding_with_spoofing(0, proto, data);
Damien Miller95def091999-11-25 00:26:21 +1100908
909 /* Read response from the server. */
910 type = packet_read(&plen);
911 if (type == SSH_SMSG_SUCCESS) {
Damien Miller95def091999-11-25 00:26:21 +1100912 interactive = 1;
Damien Millerbd483e72000-04-30 10:00:53 +1000913 } else if (type == SSH_SMSG_FAILURE) {
Damien Miller95def091999-11-25 00:26:21 +1100914 log("Warning: Remote host denied X11 forwarding.");
Damien Millerbd483e72000-04-30 10:00:53 +1000915 } else {
Damien Miller95def091999-11-25 00:26:21 +1100916 packet_disconnect("Protocol error waiting for X11 forwarding");
Damien Millerbd483e72000-04-30 10:00:53 +1000917 }
Damien Miller95def091999-11-25 00:26:21 +1100918 }
919 /* Tell the packet module whether this is an interactive session. */
Ben Lindstrombf555ba2001-01-18 02:04:35 +0000920 packet_set_interactive(interactive);
Damien Miller95def091999-11-25 00:26:21 +1100921
922 /* Request authentication agent forwarding if appropriate. */
Damien Miller0bc1bd82000-11-13 22:57:25 +1100923 check_agent_present();
924
Damien Miller95def091999-11-25 00:26:21 +1100925 if (options.forward_agent) {
926 debug("Requesting authentication agent forwarding.");
927 auth_request_forwarding();
928
929 /* Read response from the server. */
930 type = packet_read(&plen);
931 packet_integrity_check(plen, 0, type);
932 if (type != SSH_SMSG_SUCCESS)
933 log("Warning: Remote host denied authentication agent forwarding.");
934 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000935
Damien Miller0bc1bd82000-11-13 22:57:25 +1100936 /* Initiate port forwardings. */
937 ssh_init_forwarding();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000938
Damien Miller5428f641999-11-25 11:54:57 +1100939 /* If requested, let ssh continue in the background. */
Damien Miller4af51302000-04-16 11:18:38 +1000940 if (fork_after_authentication_flag)
Damien Miller5428f641999-11-25 11:54:57 +1100941 if (daemon(1, 1) < 0)
942 fatal("daemon() failed: %.200s", strerror(errno));
943
944 /*
945 * If a command was specified on the command line, execute the
946 * command now. Otherwise request the server to start a shell.
947 */
Damien Miller95def091999-11-25 00:26:21 +1100948 if (buffer_len(&command) > 0) {
949 int len = buffer_len(&command);
950 if (len > 900)
951 len = 900;
952 debug("Sending command: %.*s", len, buffer_ptr(&command));
953 packet_start(SSH_CMSG_EXEC_CMD);
954 packet_put_string(buffer_ptr(&command), buffer_len(&command));
955 packet_send();
956 packet_write_wait();
957 } else {
958 debug("Requesting shell.");
959 packet_start(SSH_CMSG_EXEC_SHELL);
960 packet_send();
961 packet_write_wait();
962 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000963
Damien Miller95def091999-11-25 00:26:21 +1100964 /* Enter the interactive session. */
Ben Lindstrom2b1f71b2001-06-05 20:32:21 +0000965 return client_loop(have_tty, tty_flag ?
966 options.escape_char : SSH_ESCAPECHAR_NONE, 0);
Damien Miller1383bd82000-04-06 12:32:37 +1000967}
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000968
Ben Lindstrombba81212001-06-25 05:01:22 +0000969static void
Ben Lindstrom1e7d3062001-02-09 02:36:43 +0000970client_subsystem_reply(int type, int plen, void *ctxt)
971{
972 int id, len;
973
974 id = packet_get_int();
975 len = buffer_len(&command);
Ben Lindstrom4040fe12001-03-05 06:52:57 +0000976 if (len > 900)
977 len = 900;
Ben Lindstrom1e7d3062001-02-09 02:36:43 +0000978 packet_done();
979 if (type == SSH2_MSG_CHANNEL_FAILURE)
980 fatal("Request for subsystem '%.*s' failed on channel %d",
981 len, buffer_ptr(&command), id);
982}
983
Ben Lindstrombba81212001-06-25 05:01:22 +0000984static void
Damien Miller0bc1bd82000-11-13 22:57:25 +1100985ssh_session2_callback(int id, void *arg)
Damien Miller1383bd82000-04-06 12:32:37 +1000986{
987 int len;
Ben Lindstrombf555ba2001-01-18 02:04:35 +0000988 int interactive = 0;
Ben Lindstromae8e2d32001-04-14 23:13:02 +0000989 struct termios tio;
Ben Lindstrombf555ba2001-01-18 02:04:35 +0000990
Kevin Stevesadf74cd2001-02-05 14:22:50 +0000991 debug("client_init id %d arg %ld", id, (long)arg);
Damien Miller1383bd82000-04-06 12:32:37 +1000992
Damien Miller1383bd82000-04-06 12:32:37 +1000993 if (tty_flag) {
994 struct winsize ws;
995 char *cp;
996 cp = getenv("TERM");
997 if (!cp)
998 cp = "";
999 /* Store window size in the packet. */
1000 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
1001 memset(&ws, 0, sizeof(ws));
1002
1003 channel_request_start(id, "pty-req", 0);
1004 packet_put_cstring(cp);
1005 packet_put_int(ws.ws_col);
1006 packet_put_int(ws.ws_row);
1007 packet_put_int(ws.ws_xpixel);
1008 packet_put_int(ws.ws_ypixel);
Ben Lindstromae8e2d32001-04-14 23:13:02 +00001009 tio = get_saved_tio();
1010 tty_make_modes(/*ignored*/ 0, &tio);
Damien Miller1383bd82000-04-06 12:32:37 +10001011 packet_send();
Ben Lindstrombf555ba2001-01-18 02:04:35 +00001012 interactive = 1;
Damien Miller1383bd82000-04-06 12:32:37 +10001013 /* XXX wait for reply */
1014 }
Damien Millerbd483e72000-04-30 10:00:53 +10001015 if (options.forward_x11 &&
1016 getenv("DISPLAY") != NULL) {
1017 char proto[512], data[512];
1018 /* Get reasonable local authentication information. */
1019 x11_get_proto(proto, sizeof proto, data, sizeof data);
1020 /* Request forwarding with authentication spoofing. */
1021 debug("Requesting X11 forwarding with authentication spoofing.");
1022 x11_request_forwarding_with_spoofing(id, proto, data);
Ben Lindstrombf555ba2001-01-18 02:04:35 +00001023 interactive = 1;
Damien Millerbd483e72000-04-30 10:00:53 +10001024 /* XXX wait for reply */
1025 }
1026
Damien Miller0bc1bd82000-11-13 22:57:25 +11001027 check_agent_present();
1028 if (options.forward_agent) {
1029 debug("Requesting authentication agent forwarding.");
1030 channel_request_start(id, "auth-agent-req@openssh.com", 0);
1031 packet_send();
1032 }
1033
Damien Miller1383bd82000-04-06 12:32:37 +10001034 len = buffer_len(&command);
1035 if (len > 0) {
1036 if (len > 900)
1037 len = 900;
Damien Miller832562e2001-01-30 09:30:01 +11001038 if (subsystem_flag) {
1039 debug("Sending subsystem: %.*s", len, buffer_ptr(&command));
Ben Lindstrom1e7d3062001-02-09 02:36:43 +00001040 channel_request_start(id, "subsystem", /*want reply*/ 1);
1041 /* register callback for reply */
1042 /* XXX we asume that client_loop has already been called */
1043 dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &client_subsystem_reply);
1044 dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &client_subsystem_reply);
Damien Miller832562e2001-01-30 09:30:01 +11001045 } else {
1046 debug("Sending command: %.*s", len, buffer_ptr(&command));
1047 channel_request_start(id, "exec", 0);
1048 }
Ben Lindstrom4040fe12001-03-05 06:52:57 +00001049 packet_put_string(buffer_ptr(&command), buffer_len(&command));
Damien Miller1383bd82000-04-06 12:32:37 +10001050 packet_send();
1051 } else {
1052 channel_request(id, "shell", 0);
1053 }
1054 /* channel_callback(id, SSH2_MSG_OPEN_CONFIGMATION, client_init, 0); */
Ben Lindstrom1e7d3062001-02-09 02:36:43 +00001055
Damien Miller1383bd82000-04-06 12:32:37 +10001056 /* register different callback, etc. XXX */
Ben Lindstrombf555ba2001-01-18 02:04:35 +00001057 packet_set_interactive(interactive);
Damien Miller1383bd82000-04-06 12:32:37 +10001058}
1059
Ben Lindstrombba81212001-06-25 05:01:22 +00001060static int
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001061ssh_session2_command(void)
Damien Miller1383bd82000-04-06 12:32:37 +10001062{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001063 Channel *c;
1064 int window, packetmax, in, out, err;
Damien Millerad833b32000-08-23 10:46:23 +10001065
Damien Millercaf6dd62000-08-29 11:33:50 +11001066 if (stdin_null_flag) {
Ben Lindstrom31ca54a2001-02-09 02:11:24 +00001067 in = open(_PATH_DEVNULL, O_RDONLY);
Damien Millercaf6dd62000-08-29 11:33:50 +11001068 } else {
1069 in = dup(STDIN_FILENO);
1070 }
1071 out = dup(STDOUT_FILENO);
1072 err = dup(STDERR_FILENO);
1073
1074 if (in < 0 || out < 0 || err < 0)
1075 fatal("dup() in/out/err failed");
1076
Damien Miller69b69aa2000-10-28 14:19:58 +11001077 /* enable nonblocking unless tty */
1078 if (!isatty(in))
1079 set_nonblock(in);
1080 if (!isatty(out))
1081 set_nonblock(out);
1082 if (!isatty(err))
1083 set_nonblock(err);
1084
Damien Millere4340be2000-09-16 13:29:08 +11001085 window = CHAN_SES_WINDOW_DEFAULT;
1086 packetmax = CHAN_SES_PACKET_DEFAULT;
1087 if (!tty_flag) {
Damien Miller1383bd82000-04-06 12:32:37 +10001088 window *= 2;
Damien Millere4340be2000-09-16 13:29:08 +11001089 packetmax *=2;
Damien Miller1383bd82000-04-06 12:32:37 +10001090 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001091 c = channel_new(
Damien Miller1383bd82000-04-06 12:32:37 +10001092 "session", SSH_CHANNEL_OPENING, in, out, err,
Damien Millere4340be2000-09-16 13:29:08 +11001093 window, packetmax, CHAN_EXTENDED_WRITE,
Damien Miller69b69aa2000-10-28 14:19:58 +11001094 xstrdup("client-session"), /*nonblock*/0);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001095 if (c == NULL)
1096 fatal("ssh_session2_command: channel_new failed");
Damien Miller1383bd82000-04-06 12:32:37 +10001097
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001098 debug3("ssh_session2_command: channel_new: %d", c->self);
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001099
Ben Lindstrom5ec26452001-06-09 00:18:51 +00001100 channel_send_open(c->self);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001101 channel_register_callback(c->self, SSH2_MSG_CHANNEL_OPEN_CONFIRMATION,
Damien Miller0bc1bd82000-11-13 22:57:25 +11001102 ssh_session2_callback, (void *)0);
Damien Miller1383bd82000-04-06 12:32:37 +10001103
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001104 return c->self;
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001105}
1106
Ben Lindstrombba81212001-06-25 05:01:22 +00001107static int
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001108ssh_session2(void)
1109{
1110 int id;
1111
1112 /* XXX should be pre-session */
1113 ssh_init_forwarding();
1114
1115 id = no_shell_flag ? -1 : ssh_session2_command();
1116
1117 /* If requested, let ssh continue in the background. */
1118 if (fork_after_authentication_flag)
1119 if (daemon(1, 1) < 0)
1120 fatal("daemon() failed: %.200s", strerror(errno));
1121
Ben Lindstrom2b1f71b2001-06-05 20:32:21 +00001122 return client_loop(tty_flag, tty_flag ?
1123 options.escape_char : SSH_ESCAPECHAR_NONE, id);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001124}
Damien Miller0bc1bd82000-11-13 22:57:25 +11001125
Ben Lindstrombba81212001-06-25 05:01:22 +00001126static void
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001127load_public_identity_files(void)
1128{
1129 char *filename;
1130 Key *public;
1131 int i;
1132
1133 for (i = 0; i < options.num_identity_files; i++) {
1134 filename = tilde_expand_filename(options.identity_files[i],
1135 original_real_uid);
Ben Lindstromd0fca422001-03-26 13:44:06 +00001136 public = key_load_public(filename, NULL);
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001137 debug("identity file %s type %d", filename,
1138 public ? public->type : -1);
1139 xfree(options.identity_files[i]);
1140 options.identity_files[i] = filename;
1141 options.identity_keys[i] = public;
1142 }
1143}