blob: 0ba69be531b46d570936bf28ba6bc7359a8fe8d9 [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 Lindstrome0f88042001-04-30 13:06:24 +000042RCSID("$OpenBSD: ssh.c,v 1.117 2001/04/30 11:18:52 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"
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
151void
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");
Damien Miller95def091999-11-25 00:26:21 +1100159 fprintf(stderr, " -a Disable authentication agent forwarding.\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");
Damien Miller95def091999-11-25 00:26:21 +1100164 fprintf(stderr, " -x Disable X11 connection forwarding.\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
Damien Miller95def091999-11-25 00:26:21 +1100177 fprintf(stderr, " -c cipher Select encryption algorithm: "
Ben Lindstrom0ab2a012001-03-05 06:45:21 +0000178 "``3des'', ``blowfish''\n");
Ben Lindstrom3d73a342001-03-05 07:39:01 +0000179 fprintf(stderr, " -m macs Specify MAC algorithms for protocol version 2.\n");
Damien Miller95def091999-11-25 00:26:21 +1100180 fprintf(stderr, " -p port Connect to this port. Server must be on the same port.\n");
181 fprintf(stderr, " -L listen-port:host:port Forward local port to remote address\n");
182 fprintf(stderr, " -R listen-port:host:port Forward remote port to local address\n");
Kevin Stevesec84dc12000-12-13 17:45:15 +0000183 fprintf(stderr, " These cause %s to listen for connections on a port, and\n", __progname);
Damien Miller95def091999-11-25 00:26:21 +1100184 fprintf(stderr, " forward them to the other side by connecting to host:port.\n");
185 fprintf(stderr, " -C Enable compression.\n");
Damien Miller1383bd82000-04-06 12:32:37 +1000186 fprintf(stderr, " -N Do not execute a shell or command.\n");
Damien Miller95def091999-11-25 00:26:21 +1100187 fprintf(stderr, " -g Allow remote hosts to connect to forwarded ports.\n");
Ben Lindstrom1e7d3062001-02-09 02:36:43 +0000188 fprintf(stderr, " -1 Force protocol version 1.\n");
189 fprintf(stderr, " -2 Force protocol version 2.\n");
Damien Miller34132e52000-01-14 15:45:46 +1100190 fprintf(stderr, " -4 Use IPv4 only.\n");
191 fprintf(stderr, " -6 Use IPv6 only.\n");
Damien Miller95def091999-11-25 00:26:21 +1100192 fprintf(stderr, " -o 'option' Process the option as if it was read from a configuration file.\n");
Damien Miller832562e2001-01-30 09:30:01 +1100193 fprintf(stderr, " -s Invoke command (mandatory) as SSH2 subsystem.\n");
Ben Lindstrome0f88042001-04-30 13:06:24 +0000194 fprintf(stderr, " -b Local IP address.\n");
Damien Miller95def091999-11-25 00:26:21 +1100195 exit(1);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000196}
197
Damien Miller95def091999-11-25 00:26:21 +1100198/*
199 * Connects to the given host using rsh (or prints an error message and exits
200 * if rsh is not available). This function never returns.
201 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000202void
Damien Miller95def091999-11-25 00:26:21 +1100203rsh_connect(char *host, char *user, Buffer * command)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000204{
Damien Miller95def091999-11-25 00:26:21 +1100205 char *args[10];
206 int i;
207
208 log("Using rsh. WARNING: Connection will not be encrypted.");
209 /* Build argument list for rsh. */
210 i = 0;
211 args[i++] = _PATH_RSH;
212 /* host may have to come after user on some systems */
213 args[i++] = host;
214 if (user) {
215 args[i++] = "-l";
216 args[i++] = user;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000217 }
Damien Miller95def091999-11-25 00:26:21 +1100218 if (buffer_len(command) > 0) {
219 buffer_append(command, "\0", 1);
220 args[i++] = buffer_ptr(command);
221 }
222 args[i++] = NULL;
223 if (debug_flag) {
224 for (i = 0; args[i]; i++) {
225 if (i != 0)
226 fprintf(stderr, " ");
227 fprintf(stderr, "%s", args[i]);
228 }
229 fprintf(stderr, "\n");
230 }
231 execv(_PATH_RSH, args);
232 perror(_PATH_RSH);
233 exit(1);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000234}
235
Damien Miller0bc1bd82000-11-13 22:57:25 +1100236int ssh_session(void);
237int ssh_session2(void);
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000238void load_public_identity_files(void);
Damien Miller1383bd82000-04-06 12:32:37 +1000239
Damien Miller95def091999-11-25 00:26:21 +1100240/*
241 * Main program for the ssh client.
242 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000243int
244main(int ac, char **av)
245{
Damien Miller1383bd82000-04-06 12:32:37 +1000246 int i, opt, optind, exit_status, ok;
Damien Milleraae6c611999-12-06 11:47:28 +1100247 u_short fwd_port, fwd_host_port;
Ben Lindstrom19066a12001-04-12 23:39:26 +0000248 char *optarg, *cp, buf[256];
Damien Miller95def091999-11-25 00:26:21 +1100249 struct stat st;
Ben Lindstrom086cf212001-03-05 05:56:40 +0000250 struct passwd *pw;
Damien Miller1383bd82000-04-06 12:32:37 +1000251 int dummy;
Damien Miller95def091999-11-25 00:26:21 +1100252 uid_t original_effective_uid;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000253
Ben Lindstrom49a79c02000-11-17 03:47:20 +0000254 __progname = get_progname(av[0]);
Damien Millerf9b625c2000-07-09 22:42:32 +1000255 init_rng();
256
Damien Miller5428f641999-11-25 11:54:57 +1100257 /*
258 * Save the original real uid. It will be needed later (uid-swapping
259 * may clobber the real uid).
260 */
Damien Miller95def091999-11-25 00:26:21 +1100261 original_real_uid = getuid();
262 original_effective_uid = geteuid();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000263
Damien Miller05dd7952000-10-01 00:42:48 +1100264#ifdef HAVE_SETRLIMIT
Damien Miller95def091999-11-25 00:26:21 +1100265 /* If we are installed setuid root be careful to not drop core. */
266 if (original_real_uid != original_effective_uid) {
267 struct rlimit rlim;
268 rlim.rlim_cur = rlim.rlim_max = 0;
269 if (setrlimit(RLIMIT_CORE, &rlim) < 0)
270 fatal("setrlimit failed: %.100s", strerror(errno));
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000271 }
Damien Millerbac2d8a2000-09-05 16:13:06 +1100272#endif
Ben Lindstrom3fcf1a22001-04-08 18:26:59 +0000273 /* Get user data. */
274 pw = getpwuid(original_real_uid);
275 if (!pw) {
276 log("You don't exist, go away!");
277 exit(1);
278 }
279 /* Take a copy of the returned structure. */
280 pw = pwcopy(pw);
281
Damien Miller5428f641999-11-25 11:54:57 +1100282 /*
283 * Use uid-swapping to give up root privileges for the duration of
284 * option processing. We will re-instantiate the rights when we are
285 * ready to create the privileged port, and will permanently drop
286 * them when the port has been created (actually, when the connection
287 * has been made, as we may need to create the port several times).
288 */
Ben Lindstrom3fcf1a22001-04-08 18:26:59 +0000289 temporarily_use_uid(pw);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000290
Damien Miller5428f641999-11-25 11:54:57 +1100291 /*
292 * Set our umask to something reasonable, as some files are created
293 * with the default umask. This will make them world-readable but
294 * writable only by the owner, which is ok for all files for which we
295 * don't set the modes explicitly.
296 */
Damien Miller95def091999-11-25 00:26:21 +1100297 umask(022);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000298
Damien Miller95def091999-11-25 00:26:21 +1100299 /* Initialize option structure to indicate that no values have been set. */
300 initialize_options(&options);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000301
Damien Miller95def091999-11-25 00:26:21 +1100302 /* Parse command-line arguments. */
303 host = NULL;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000304
Damien Miller95def091999-11-25 00:26:21 +1100305 for (optind = 1; optind < ac; optind++) {
306 if (av[optind][0] != '-') {
307 if (host)
308 break;
309 if ((cp = strchr(av[optind], '@'))) {
Damien Miller4af51302000-04-16 11:18:38 +1000310 if(cp == av[optind])
311 usage();
Damien Miller95def091999-11-25 00:26:21 +1100312 options.user = av[optind];
313 *cp = '\0';
314 host = ++cp;
315 } else
316 host = av[optind];
317 continue;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000318 }
Damien Miller95def091999-11-25 00:26:21 +1100319 opt = av[optind][1];
320 if (!opt)
321 usage();
Ben Lindstrome0f88042001-04-30 13:06:24 +0000322 if (strchr("eilcmpbLRDo", opt)) { /* options with arguments */
Damien Miller95def091999-11-25 00:26:21 +1100323 optarg = av[optind] + 2;
324 if (strcmp(optarg, "") == 0) {
325 if (optind >= ac - 1)
326 usage();
327 optarg = av[++optind];
328 }
329 } else {
330 if (av[optind][2])
331 usage();
332 optarg = NULL;
333 }
334 switch (opt) {
Ben Lindstrom1e7d3062001-02-09 02:36:43 +0000335 case '1':
336 options.protocol = SSH_PROTO_1;
337 break;
Damien Miller4af51302000-04-16 11:18:38 +1000338 case '2':
339 options.protocol = SSH_PROTO_2;
340 break;
Damien Miller34132e52000-01-14 15:45:46 +1100341 case '4':
342 IPv4or6 = AF_INET;
343 break;
Damien Miller34132e52000-01-14 15:45:46 +1100344 case '6':
345 IPv4or6 = AF_INET6;
346 break;
Damien Miller95def091999-11-25 00:26:21 +1100347 case 'n':
348 stdin_null_flag = 1;
349 break;
Damien Miller95def091999-11-25 00:26:21 +1100350 case 'f':
351 fork_after_authentication_flag = 1;
352 stdin_null_flag = 1;
353 break;
Damien Miller95def091999-11-25 00:26:21 +1100354 case 'x':
355 options.forward_x11 = 0;
356 break;
Damien Miller95def091999-11-25 00:26:21 +1100357 case 'X':
358 options.forward_x11 = 1;
359 break;
Damien Miller95def091999-11-25 00:26:21 +1100360 case 'g':
361 options.gateway_ports = 1;
362 break;
Damien Miller95def091999-11-25 00:26:21 +1100363 case 'P':
364 options.use_privileged_port = 0;
365 break;
Damien Miller95def091999-11-25 00:26:21 +1100366 case 'a':
367 options.forward_agent = 0;
368 break;
Damien Millerb1715dc2000-05-30 13:44:51 +1000369 case 'A':
370 options.forward_agent = 1;
371 break;
Damien Miller95def091999-11-25 00:26:21 +1100372#ifdef AFS
373 case 'k':
374 options.kerberos_tgt_passing = 0;
375 options.afs_token_passing = 0;
376 break;
377#endif
378 case 'i':
379 if (stat(optarg, &st) < 0) {
380 fprintf(stderr, "Warning: Identity file %s does not exist.\n",
Damien Miller0bc1bd82000-11-13 22:57:25 +1100381 optarg);
Damien Miller95def091999-11-25 00:26:21 +1100382 break;
383 }
384 if (options.num_identity_files >= SSH_MAX_IDENTITY_FILES)
385 fatal("Too many identity files specified (max %d)",
Damien Miller0bc1bd82000-11-13 22:57:25 +1100386 SSH_MAX_IDENTITY_FILES);
387 options.identity_files[options.num_identity_files++] = xstrdup(optarg);
Damien Miller95def091999-11-25 00:26:21 +1100388 break;
Damien Miller95def091999-11-25 00:26:21 +1100389 case 't':
Ben Lindstrom4dccfa52000-12-28 16:40:05 +0000390 if (tty_flag)
391 force_tty_flag = 1;
Damien Miller95def091999-11-25 00:26:21 +1100392 tty_flag = 1;
393 break;
Damien Miller95def091999-11-25 00:26:21 +1100394 case 'v':
Damien Millere4340be2000-09-16 13:29:08 +1100395 if (0 == debug_flag) {
396 debug_flag = 1;
397 options.log_level = SYSLOG_LEVEL_DEBUG1;
398 } else if (options.log_level < SYSLOG_LEVEL_DEBUG3) {
399 options.log_level++;
400 break;
401 } else {
Ben Lindstrom6df8ef42001-03-05 07:47:23 +0000402 fatal("Too high debugging level.");
Damien Millere4340be2000-09-16 13:29:08 +1100403 }
404 /* fallthrough */
Damien Miller95def091999-11-25 00:26:21 +1100405 case 'V':
Damien Miller225736c2001-02-19 21:51:08 +1100406 fprintf(stderr,
407 "%s, SSH protocols %d.%d/%d.%d, OpenSSL 0x%8.8lx\n",
Damien Miller78928792000-04-12 20:17:38 +1000408 SSH_VERSION,
409 PROTOCOL_MAJOR_1, PROTOCOL_MINOR_1,
Damien Miller225736c2001-02-19 21:51:08 +1100410 PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2,
411 SSLeay());
Damien Miller95def091999-11-25 00:26:21 +1100412 if (opt == 'V')
413 exit(0);
Damien Miller95def091999-11-25 00:26:21 +1100414 break;
Damien Miller95def091999-11-25 00:26:21 +1100415 case 'q':
416 options.log_level = SYSLOG_LEVEL_QUIET;
417 break;
Damien Miller95def091999-11-25 00:26:21 +1100418 case 'e':
419 if (optarg[0] == '^' && optarg[2] == 0 &&
Ben Lindstrom46c16222000-12-22 01:43:59 +0000420 (u_char) optarg[1] >= 64 && (u_char) optarg[1] < 128)
421 options.escape_char = (u_char) optarg[1] & 31;
Damien Miller95def091999-11-25 00:26:21 +1100422 else if (strlen(optarg) == 1)
Ben Lindstrom46c16222000-12-22 01:43:59 +0000423 options.escape_char = (u_char) optarg[0];
Damien Miller95def091999-11-25 00:26:21 +1100424 else if (strcmp(optarg, "none") == 0)
425 options.escape_char = -2;
426 else {
427 fprintf(stderr, "Bad escape character '%s'.\n", optarg);
428 exit(1);
429 }
430 break;
Damien Miller95def091999-11-25 00:26:21 +1100431 case 'c':
Damien Millereba71ba2000-04-29 23:57:08 +1000432 if (ciphers_valid(optarg)) {
433 /* SSH2 only */
434 options.ciphers = xstrdup(optarg);
Damien Miller30c3d422000-05-09 11:02:59 +1000435 options.cipher = SSH_CIPHER_ILLEGAL;
Damien Millereba71ba2000-04-29 23:57:08 +1000436 } else {
437 /* SSH1 only */
Damien Millere39cacc2000-11-29 12:18:44 +1100438 options.cipher = cipher_number(optarg);
439 if (options.cipher == -1) {
Damien Millereba71ba2000-04-29 23:57:08 +1000440 fprintf(stderr, "Unknown cipher type '%s'\n", optarg);
441 exit(1);
442 }
Damien Millere39cacc2000-11-29 12:18:44 +1100443 if (options.cipher == SSH_CIPHER_3DES) {
444 options.ciphers = "3des-cbc";
445 } else if (options.cipher == SSH_CIPHER_BLOWFISH) {
446 options.ciphers = "blowfish-cbc";
447 } else {
448 options.ciphers = (char *)-1;
449 }
Damien Miller95def091999-11-25 00:26:21 +1100450 }
451 break;
Ben Lindstrom06b33aa2001-02-15 03:01:59 +0000452 case 'm':
453 if (mac_valid(optarg))
454 options.macs = xstrdup(optarg);
455 else {
456 fprintf(stderr, "Unknown mac type '%s'\n", optarg);
457 exit(1);
458 }
459 break;
Damien Miller95def091999-11-25 00:26:21 +1100460 case 'p':
Ben Lindstrom19066a12001-04-12 23:39:26 +0000461 options.port = a2port(optarg);
462 if (options.port == 0) {
Ben Lindstrom146edb92001-04-11 23:06:28 +0000463 fprintf(stderr, "Bad port '%s'\n", optarg);
464 exit(1);
465 }
Damien Miller95def091999-11-25 00:26:21 +1100466 break;
Damien Miller95def091999-11-25 00:26:21 +1100467 case 'l':
468 options.user = optarg;
469 break;
Damien Miller95def091999-11-25 00:26:21 +1100470 case 'R':
Damien Miller34132e52000-01-14 15:45:46 +1100471 if (sscanf(optarg, "%hu/%255[^/]/%hu", &fwd_port, buf,
472 &fwd_host_port) != 3 &&
473 sscanf(optarg, "%hu:%255[^:]:%hu", &fwd_port, buf,
474 &fwd_host_port) != 3) {
Damien Miller95def091999-11-25 00:26:21 +1100475 fprintf(stderr, "Bad forwarding specification '%s'.\n", optarg);
476 usage();
477 /* NOTREACHED */
478 }
479 add_remote_forward(&options, fwd_port, buf, fwd_host_port);
480 break;
Damien Miller95def091999-11-25 00:26:21 +1100481 case 'L':
Damien Miller34132e52000-01-14 15:45:46 +1100482 if (sscanf(optarg, "%hu/%255[^/]/%hu", &fwd_port, buf,
483 &fwd_host_port) != 3 &&
484 sscanf(optarg, "%hu:%255[^:]:%hu", &fwd_port, buf,
485 &fwd_host_port) != 3) {
Damien Miller95def091999-11-25 00:26:21 +1100486 fprintf(stderr, "Bad forwarding specification '%s'.\n", optarg);
487 usage();
488 /* NOTREACHED */
489 }
490 add_local_forward(&options, fwd_port, buf, fwd_host_port);
491 break;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000492
493 case 'D':
Ben Lindstrom19066a12001-04-12 23:39:26 +0000494 fwd_port = a2port(optarg);
495 if (fwd_port == 0) {
496 fprintf(stderr, "Bad dynamic port '%s'\n", optarg);
Ben Lindstrom146edb92001-04-11 23:06:28 +0000497 exit(1);
498 }
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000499 add_local_forward(&options, fwd_port, "socks4", 0);
500 break;
501
Damien Miller95def091999-11-25 00:26:21 +1100502 case 'C':
503 options.compression = 1;
504 break;
Damien Miller1383bd82000-04-06 12:32:37 +1000505 case 'N':
506 no_shell_flag = 1;
507 no_tty_flag = 1;
508 break;
Damien Miller1383bd82000-04-06 12:32:37 +1000509 case 'T':
510 no_tty_flag = 1;
511 break;
Damien Miller95def091999-11-25 00:26:21 +1100512 case 'o':
513 dummy = 1;
514 if (process_config_line(&options, host ? host : "", optarg,
515 "command-line", 0, &dummy) != 0)
516 exit(1);
517 break;
Damien Miller832562e2001-01-30 09:30:01 +1100518 case 's':
519 subsystem_flag = 1;
520 break;
Ben Lindstrome0f88042001-04-30 13:06:24 +0000521 case 'b':
522 options.bind_address = optarg;
523 break;
Damien Miller95def091999-11-25 00:26:21 +1100524 default:
525 usage();
526 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000527 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000528
Damien Miller95def091999-11-25 00:26:21 +1100529 /* Check that we got a host name. */
530 if (!host)
531 usage();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000532
Damien Millercb5e44a2000-09-29 12:12:36 +1100533 SSLeay_add_all_algorithms();
Damien Miller0bc1bd82000-11-13 22:57:25 +1100534 ERR_load_crypto_strings();
Damien Millercb5e44a2000-09-29 12:12:36 +1100535
Damien Miller95def091999-11-25 00:26:21 +1100536 /* Initialize the command to execute on remote host. */
537 buffer_init(&command);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000538
Damien Miller5428f641999-11-25 11:54:57 +1100539 /*
540 * Save the command to execute on the remote host in a buffer. There
541 * is no limit on the length of the command, except by the maximum
542 * packet size. Also sets the tty flag if there is no command.
543 */
Damien Miller95def091999-11-25 00:26:21 +1100544 if (optind == ac) {
545 /* No command specified - execute shell on a tty. */
546 tty_flag = 1;
Damien Miller832562e2001-01-30 09:30:01 +1100547 if (subsystem_flag) {
Ben Lindstrom92d4a022001-04-13 04:44:37 +0000548 fprintf(stderr, "You must specify a subsystem to invoke.\n");
Damien Miller832562e2001-01-30 09:30:01 +1100549 usage();
550 }
Damien Miller95def091999-11-25 00:26:21 +1100551 } else {
552 /* A command has been specified. Store it into the
553 buffer. */
554 for (i = optind; i < ac; i++) {
555 if (i > optind)
556 buffer_append(&command, " ", 1);
557 buffer_append(&command, av[i], strlen(av[i]));
558 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000559 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000560
Damien Miller95def091999-11-25 00:26:21 +1100561 /* Cannot fork to background if no command. */
Damien Millercaf6dd62000-08-29 11:33:50 +1100562 if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag)
Damien Miller95def091999-11-25 00:26:21 +1100563 fatal("Cannot fork into background without a command to execute.");
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000564
Damien Miller95def091999-11-25 00:26:21 +1100565 /* Allocate a tty by default if no command specified. */
566 if (buffer_len(&command) == 0)
567 tty_flag = 1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000568
Ben Lindstromc72745a2000-12-02 19:03:54 +0000569 /* Force no tty*/
570 if (no_tty_flag)
571 tty_flag = 0;
Damien Miller95def091999-11-25 00:26:21 +1100572 /* Do not allocate a tty if stdin is not a tty. */
Ben Lindstrom4dccfa52000-12-28 16:40:05 +0000573 if (!isatty(fileno(stdin)) && !force_tty_flag) {
Damien Miller95def091999-11-25 00:26:21 +1100574 if (tty_flag)
Ben Lindstrom6df8ef42001-03-05 07:47:23 +0000575 log("Pseudo-terminal will not be allocated because stdin is not a terminal.");
Damien Miller95def091999-11-25 00:26:21 +1100576 tty_flag = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000577 }
Damien Miller1383bd82000-04-06 12:32:37 +1000578
Ben Lindstrom8a432f52001-03-05 07:24:46 +0000579 /*
580 * Initialize "log" output. Since we are the client all output
581 * actually goes to stderr.
582 */
Ben Lindstrom2b646522001-04-12 16:16:57 +0000583 log_init(av[0], options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level,
584 SYSLOG_FACILITY_USER, 1);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000585
Damien Miller95def091999-11-25 00:26:21 +1100586 /* Read per-user configuration file. */
Ben Lindstrom226cfa02001-01-22 05:34:40 +0000587 snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, _PATH_SSH_USER_CONFFILE);
Damien Miller95def091999-11-25 00:26:21 +1100588 read_config_file(buf, host, &options);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000589
Damien Miller95def091999-11-25 00:26:21 +1100590 /* Read systemwide configuration file. */
Ben Lindstrom226cfa02001-01-22 05:34:40 +0000591 read_config_file(_PATH_HOST_CONFIG_FILE, host, &options);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000592
Damien Miller95def091999-11-25 00:26:21 +1100593 /* Fill configuration defaults. */
594 fill_default_options(&options);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000595
Damien Miller95def091999-11-25 00:26:21 +1100596 /* reinit */
Ben Lindstrom8a432f52001-03-05 07:24:46 +0000597 log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 1);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000598
Damien Miller60bc5172001-03-19 09:38:15 +1100599 seed_rng();
600
Damien Miller95def091999-11-25 00:26:21 +1100601 if (options.user == NULL)
602 options.user = xstrdup(pw->pw_name);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000603
Damien Miller95def091999-11-25 00:26:21 +1100604 if (options.hostname != NULL)
605 host = options.hostname;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000606
Damien Miller95def091999-11-25 00:26:21 +1100607 /* Disable rhosts authentication if not running as root. */
Damien Millerbac2d8a2000-09-05 16:13:06 +1100608#ifdef HAVE_CYGWIN
609 /* Ignore uid if running under Windows */
610 if (!options.use_privileged_port) {
611#else
Damien Miller95def091999-11-25 00:26:21 +1100612 if (original_effective_uid != 0 || !options.use_privileged_port) {
Damien Millerbac2d8a2000-09-05 16:13:06 +1100613#endif
Kevin Stevesfcec7f82000-12-15 19:55:48 +0000614 debug("Rhosts Authentication disabled, "
615 "originating port will not be trusted.");
Damien Miller95def091999-11-25 00:26:21 +1100616 options.rhosts_authentication = 0;
Damien Miller95def091999-11-25 00:26:21 +1100617 }
Ben Lindstrom3fcf1a22001-04-08 18:26:59 +0000618
Damien Miller5428f641999-11-25 11:54:57 +1100619 /*
620 * If using rsh has been selected, exec it now (without trying
621 * anything else). Note that we must release privileges first.
622 */
Damien Miller95def091999-11-25 00:26:21 +1100623 if (options.use_rsh) {
Damien Miller5428f641999-11-25 11:54:57 +1100624 /*
625 * Restore our superuser privileges. This must be done
626 * before permanently setting the uid.
627 */
Damien Miller95def091999-11-25 00:26:21 +1100628 restore_uid();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000629
Damien Miller95def091999-11-25 00:26:21 +1100630 /* Switch to the original uid permanently. */
Ben Lindstrom3fcf1a22001-04-08 18:26:59 +0000631 permanently_set_uid(pw);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000632
Damien Miller95def091999-11-25 00:26:21 +1100633 /* Execute rsh. */
634 rsh_connect(host, options.user, &command);
635 fatal("rsh_connect returned");
636 }
637 /* Restore our superuser privileges. */
638 restore_uid();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000639
Kevin Stevesfcec7f82000-12-15 19:55:48 +0000640 /* Open a connection to the remote host. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000641
Damien Miller95def091999-11-25 00:26:21 +1100642 ok = ssh_connect(host, &hostaddr, options.port,
Kevin Stevesfcec7f82000-12-15 19:55:48 +0000643 options.connection_attempts,
644 original_effective_uid != 0 || !options.use_privileged_port,
Ben Lindstrom3fcf1a22001-04-08 18:26:59 +0000645 pw, options.proxy_command);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000646
Damien Miller5428f641999-11-25 11:54:57 +1100647 /*
648 * If we successfully made the connection, load the host private key
649 * in case we will need it later for combined rsa-rhosts
650 * authentication. This must be done before releasing extra
651 * privileges, because the file is only readable by root.
652 */
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000653 sensitive_data.nkeys = 0;
654 sensitive_data.keys = NULL;
655 if (ok && (options.rhosts_rsa_authentication ||
656 options.hostbased_authentication)) {
657 sensitive_data.nkeys = 3;
658 sensitive_data.keys = xmalloc(sensitive_data.nkeys*sizeof(Key));
659 sensitive_data.keys[0] = key_load_private_type(KEY_RSA1,
Ben Lindstromd0fca422001-03-26 13:44:06 +0000660 _PATH_HOST_KEY_FILE, "", NULL);
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000661 sensitive_data.keys[1] = key_load_private_type(KEY_DSA,
662 _PATH_HOST_DSA_KEY_FILE, "", NULL);
663 sensitive_data.keys[2] = key_load_private_type(KEY_RSA,
664 _PATH_HOST_RSA_KEY_FILE, "", NULL);
Damien Miller95def091999-11-25 00:26:21 +1100665 }
Damien Miller5428f641999-11-25 11:54:57 +1100666 /*
667 * Get rid of any extra privileges that we may have. We will no
668 * longer need them. Also, extra privileges could make it very hard
669 * to read identity files and other non-world-readable files from the
670 * user's home directory if it happens to be on a NFS volume where
671 * root is mapped to nobody.
672 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000673
Damien Miller5428f641999-11-25 11:54:57 +1100674 /*
675 * Note that some legacy systems need to postpone the following call
676 * to permanently_set_uid() until the private hostkey is destroyed
677 * with RSA_free(). Otherwise the calling user could ptrace() the
678 * process, read the private hostkey and impersonate the host.
679 * OpenBSD does not allow ptracing of setuid processes.
680 */
Ben Lindstrom3fcf1a22001-04-08 18:26:59 +0000681 permanently_set_uid(pw);
Damien Miller95def091999-11-25 00:26:21 +1100682
Damien Miller5428f641999-11-25 11:54:57 +1100683 /*
684 * Now that we are back to our own permissions, create ~/.ssh
685 * directory if it doesn\'t already exist.
686 */
Ben Lindstrom226cfa02001-01-22 05:34:40 +0000687 snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, _PATH_SSH_USER_DIR);
Damien Miller95def091999-11-25 00:26:21 +1100688 if (stat(buf, &st) < 0)
Damien Millerbe484b52000-07-15 14:14:16 +1000689 if (mkdir(buf, 0700) < 0)
Damien Miller95def091999-11-25 00:26:21 +1100690 error("Could not create directory '%.200s'.", buf);
691
692 /* Check if the connection failed, and try "rsh" if appropriate. */
693 if (!ok) {
694 if (options.port != 0)
Damien Milleraae6c611999-12-06 11:47:28 +1100695 log("Secure connection to %.100s on port %hu refused%.100s.",
Damien Miller95def091999-11-25 00:26:21 +1100696 host, options.port,
697 options.fallback_to_rsh ? "; reverting to insecure method" : "");
698 else
699 log("Secure connection to %.100s refused%.100s.", host,
700 options.fallback_to_rsh ? "; reverting to insecure method" : "");
701
702 if (options.fallback_to_rsh) {
703 rsh_connect(host, options.user, &command);
704 fatal("rsh_connect returned");
705 }
706 exit(1);
707 }
Ben Lindstrom266dfdf2001-03-09 00:12:22 +0000708 /* load options.identity_files */
709 load_public_identity_files();
710
711 /* Expand ~ in known host file names. */
712 /* XXX mem-leaks: */
Damien Miller0bc1bd82000-11-13 22:57:25 +1100713 options.system_hostfile =
714 tilde_expand_filename(options.system_hostfile, original_real_uid);
715 options.user_hostfile =
716 tilde_expand_filename(options.user_hostfile, original_real_uid);
717 options.system_hostfile2 =
718 tilde_expand_filename(options.system_hostfile2, original_real_uid);
719 options.user_hostfile2 =
720 tilde_expand_filename(options.user_hostfile2, original_real_uid);
Damien Miller95def091999-11-25 00:26:21 +1100721
722 /* Log into the remote system. This never returns if the login fails. */
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000723 ssh_login(sensitive_data.keys, sensitive_data.nkeys,
724 host, (struct sockaddr *)&hostaddr, pw);
Damien Miller95def091999-11-25 00:26:21 +1100725
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000726 /* We no longer need the private host keys. Clear them now. */
727 if (sensitive_data.nkeys != 0) {
728 for (i = 0; i < sensitive_data.nkeys; i++) {
729 if (sensitive_data.keys[i] != NULL) {
730 /* Destroys contents safely */
731 debug3("clear hostkey %d", i);
732 key_free(sensitive_data.keys[i]);
733 sensitive_data.keys[i] = NULL;
734 }
735 }
736 xfree(sensitive_data.keys);
737 }
Damien Miller95def091999-11-25 00:26:21 +1100738
Damien Miller1383bd82000-04-06 12:32:37 +1000739 exit_status = compat20 ? ssh_session2() : ssh_session();
740 packet_close();
741 return exit_status;
742}
743
Damien Millerbd483e72000-04-30 10:00:53 +1000744void
745x11_get_proto(char *proto, int proto_len, char *data, int data_len)
746{
747 char line[512];
748 FILE *f;
749 int got_data = 0, i;
750
Damien Millerd3a18572000-06-07 19:55:44 +1000751 if (options.xauth_location) {
752 /* Try to get Xauthority information for the display. */
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000753 snprintf(line, sizeof line, "%.100s list %.200s 2>" _PATH_DEVNULL,
Damien Millerd3a18572000-06-07 19:55:44 +1000754 options.xauth_location, getenv("DISPLAY"));
755 f = popen(line, "r");
756 if (f && fgets(line, sizeof(line), f) &&
757 sscanf(line, "%*s %s %s", proto, data) == 2)
758 got_data = 1;
759 if (f)
760 pclose(f);
761 }
Damien Millerbd483e72000-04-30 10:00:53 +1000762 /*
763 * If we didn't get authentication data, just make up some
764 * data. The forwarding code will check the validity of the
765 * response anyway, and substitute this data. The X11
766 * server, however, will ignore this fake data and use
767 * whatever authentication mechanisms it was using otherwise
768 * for the local connection.
769 */
770 if (!got_data) {
771 u_int32_t rand = 0;
772
773 strlcpy(proto, "MIT-MAGIC-COOKIE-1", proto_len);
774 for (i = 0; i < 16; i++) {
775 if (i % 4 == 0)
776 rand = arc4random();
777 snprintf(data + 2 * i, data_len - 2 * i, "%02x", rand & 0xff);
778 rand >>= 8;
779 }
780 }
781}
782
Damien Miller0bc1bd82000-11-13 22:57:25 +1100783void
784ssh_init_forwarding(void)
785{
Kevin Steves12057502001-02-05 14:54:34 +0000786 int success = 0;
Damien Miller0bc1bd82000-11-13 22:57:25 +1100787 int i;
Kevin Steves12057502001-02-05 14:54:34 +0000788
Damien Miller0bc1bd82000-11-13 22:57:25 +1100789 /* Initiate local TCP/IP port forwardings. */
790 for (i = 0; i < options.num_local_forwards; i++) {
791 debug("Connections to local port %d forwarded to remote address %.200s:%d",
792 options.local_forwards[i].port,
793 options.local_forwards[i].host,
794 options.local_forwards[i].host_port);
Kevin Steves12057502001-02-05 14:54:34 +0000795 success += channel_request_local_forwarding(
Damien Miller0bc1bd82000-11-13 22:57:25 +1100796 options.local_forwards[i].port,
797 options.local_forwards[i].host,
798 options.local_forwards[i].host_port,
799 options.gateway_ports);
800 }
Kevin Steves12057502001-02-05 14:54:34 +0000801 if (i > 0 && success == 0)
802 error("Could not request local forwarding.");
Damien Miller0bc1bd82000-11-13 22:57:25 +1100803
804 /* Initiate remote TCP/IP port forwardings. */
805 for (i = 0; i < options.num_remote_forwards; i++) {
806 debug("Connections to remote port %d forwarded to local address %.200s:%d",
807 options.remote_forwards[i].port,
808 options.remote_forwards[i].host,
809 options.remote_forwards[i].host_port);
810 channel_request_remote_forwarding(
811 options.remote_forwards[i].port,
812 options.remote_forwards[i].host,
813 options.remote_forwards[i].host_port);
814 }
815}
816
817void
818check_agent_present(void)
819{
820 if (options.forward_agent) {
821 /* Clear agent forwarding if we don\'t have an agent. */
822 int authfd = ssh_get_authentication_socket();
823 if (authfd < 0)
824 options.forward_agent = 0;
825 else
826 ssh_close_authentication_socket(authfd);
827 }
828}
829
Damien Miller1383bd82000-04-06 12:32:37 +1000830int
831ssh_session(void)
832{
833 int type;
Damien Miller1383bd82000-04-06 12:32:37 +1000834 int plen;
835 int interactive = 0;
836 int have_tty = 0;
837 struct winsize ws;
Damien Miller1383bd82000-04-06 12:32:37 +1000838 char *cp;
839
Damien Miller95def091999-11-25 00:26:21 +1100840 /* Enable compression if requested. */
841 if (options.compression) {
842 debug("Requesting compression at level %d.", options.compression_level);
843
844 if (options.compression_level < 1 || options.compression_level > 9)
845 fatal("Compression level must be from 1 (fast) to 9 (slow, best).");
846
847 /* Send the request. */
848 packet_start(SSH_CMSG_REQUEST_COMPRESSION);
849 packet_put_int(options.compression_level);
850 packet_send();
851 packet_write_wait();
852 type = packet_read(&plen);
853 if (type == SSH_SMSG_SUCCESS)
854 packet_start_compression(options.compression_level);
855 else if (type == SSH_SMSG_FAILURE)
856 log("Warning: Remote host refused compression.");
857 else
858 packet_disconnect("Protocol error waiting for compression response.");
859 }
860 /* Allocate a pseudo tty if appropriate. */
861 if (tty_flag) {
862 debug("Requesting pty.");
863
864 /* Start the packet. */
865 packet_start(SSH_CMSG_REQUEST_PTY);
866
867 /* Store TERM in the packet. There is no limit on the
868 length of the string. */
869 cp = getenv("TERM");
870 if (!cp)
871 cp = "";
872 packet_put_string(cp, strlen(cp));
873
874 /* Store window size in the packet. */
875 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
876 memset(&ws, 0, sizeof(ws));
877 packet_put_int(ws.ws_row);
878 packet_put_int(ws.ws_col);
879 packet_put_int(ws.ws_xpixel);
880 packet_put_int(ws.ws_ypixel);
881
882 /* Store tty modes in the packet. */
Ben Lindstromae8e2d32001-04-14 23:13:02 +0000883 tty_make_modes(fileno(stdin), NULL);
Damien Miller95def091999-11-25 00:26:21 +1100884
885 /* Send the packet, and wait for it to leave. */
886 packet_send();
887 packet_write_wait();
888
889 /* Read response from the server. */
890 type = packet_read(&plen);
Damien Miller450a7a12000-03-26 13:04:51 +1000891 if (type == SSH_SMSG_SUCCESS) {
Damien Miller95def091999-11-25 00:26:21 +1100892 interactive = 1;
Damien Miller1383bd82000-04-06 12:32:37 +1000893 have_tty = 1;
Damien Miller450a7a12000-03-26 13:04:51 +1000894 } else if (type == SSH_SMSG_FAILURE)
Damien Miller95def091999-11-25 00:26:21 +1100895 log("Warning: Remote host failed or refused to allocate a pseudo tty.");
896 else
897 packet_disconnect("Protocol error waiting for pty request response.");
898 }
899 /* Request X11 forwarding if enabled and DISPLAY is set. */
900 if (options.forward_x11 && getenv("DISPLAY") != NULL) {
Damien Millerbd483e72000-04-30 10:00:53 +1000901 char proto[512], data[512];
902 /* Get reasonable local authentication information. */
903 x11_get_proto(proto, sizeof proto, data, sizeof data);
904 /* Request forwarding with authentication spoofing. */
Damien Miller95def091999-11-25 00:26:21 +1100905 debug("Requesting X11 forwarding with authentication spoofing.");
Damien Millerbd483e72000-04-30 10:00:53 +1000906 x11_request_forwarding_with_spoofing(0, proto, data);
Damien Miller95def091999-11-25 00:26:21 +1100907
908 /* Read response from the server. */
909 type = packet_read(&plen);
910 if (type == SSH_SMSG_SUCCESS) {
Damien Miller95def091999-11-25 00:26:21 +1100911 interactive = 1;
Damien Millerbd483e72000-04-30 10:00:53 +1000912 } else if (type == SSH_SMSG_FAILURE) {
Damien Miller95def091999-11-25 00:26:21 +1100913 log("Warning: Remote host denied X11 forwarding.");
Damien Millerbd483e72000-04-30 10:00:53 +1000914 } else {
Damien Miller95def091999-11-25 00:26:21 +1100915 packet_disconnect("Protocol error waiting for X11 forwarding");
Damien Millerbd483e72000-04-30 10:00:53 +1000916 }
Damien Miller95def091999-11-25 00:26:21 +1100917 }
918 /* Tell the packet module whether this is an interactive session. */
Ben Lindstrombf555ba2001-01-18 02:04:35 +0000919 packet_set_interactive(interactive);
Damien Miller95def091999-11-25 00:26:21 +1100920
921 /* Request authentication agent forwarding if appropriate. */
Damien Miller0bc1bd82000-11-13 22:57:25 +1100922 check_agent_present();
923
Damien Miller95def091999-11-25 00:26:21 +1100924 if (options.forward_agent) {
925 debug("Requesting authentication agent forwarding.");
926 auth_request_forwarding();
927
928 /* Read response from the server. */
929 type = packet_read(&plen);
930 packet_integrity_check(plen, 0, type);
931 if (type != SSH_SMSG_SUCCESS)
932 log("Warning: Remote host denied authentication agent forwarding.");
933 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000934
Damien Miller0bc1bd82000-11-13 22:57:25 +1100935 /* Initiate port forwardings. */
936 ssh_init_forwarding();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000937
Damien Miller5428f641999-11-25 11:54:57 +1100938 /* If requested, let ssh continue in the background. */
Damien Miller4af51302000-04-16 11:18:38 +1000939 if (fork_after_authentication_flag)
Damien Miller5428f641999-11-25 11:54:57 +1100940 if (daemon(1, 1) < 0)
941 fatal("daemon() failed: %.200s", strerror(errno));
942
943 /*
944 * If a command was specified on the command line, execute the
945 * command now. Otherwise request the server to start a shell.
946 */
Damien Miller95def091999-11-25 00:26:21 +1100947 if (buffer_len(&command) > 0) {
948 int len = buffer_len(&command);
949 if (len > 900)
950 len = 900;
951 debug("Sending command: %.*s", len, buffer_ptr(&command));
952 packet_start(SSH_CMSG_EXEC_CMD);
953 packet_put_string(buffer_ptr(&command), buffer_len(&command));
954 packet_send();
955 packet_write_wait();
956 } else {
957 debug("Requesting shell.");
958 packet_start(SSH_CMSG_EXEC_SHELL);
959 packet_send();
960 packet_write_wait();
961 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000962
Damien Miller95def091999-11-25 00:26:21 +1100963 /* Enter the interactive session. */
Damien Millerad833b32000-08-23 10:46:23 +1000964 return client_loop(have_tty, tty_flag ? options.escape_char : -1, 0);
Damien Miller1383bd82000-04-06 12:32:37 +1000965}
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000966
Damien Miller1383bd82000-04-06 12:32:37 +1000967void
Ben Lindstrom1e7d3062001-02-09 02:36:43 +0000968client_subsystem_reply(int type, int plen, void *ctxt)
969{
970 int id, len;
971
972 id = packet_get_int();
973 len = buffer_len(&command);
Ben Lindstrom4040fe12001-03-05 06:52:57 +0000974 if (len > 900)
975 len = 900;
Ben Lindstrom1e7d3062001-02-09 02:36:43 +0000976 packet_done();
977 if (type == SSH2_MSG_CHANNEL_FAILURE)
978 fatal("Request for subsystem '%.*s' failed on channel %d",
979 len, buffer_ptr(&command), id);
980}
981
982void
Damien Miller0bc1bd82000-11-13 22:57:25 +1100983ssh_session2_callback(int id, void *arg)
Damien Miller1383bd82000-04-06 12:32:37 +1000984{
985 int len;
Ben Lindstrombf555ba2001-01-18 02:04:35 +0000986 int interactive = 0;
Ben Lindstromae8e2d32001-04-14 23:13:02 +0000987 struct termios tio;
Ben Lindstrombf555ba2001-01-18 02:04:35 +0000988
Kevin Stevesadf74cd2001-02-05 14:22:50 +0000989 debug("client_init id %d arg %ld", id, (long)arg);
Damien Miller1383bd82000-04-06 12:32:37 +1000990
Damien Miller1383bd82000-04-06 12:32:37 +1000991 if (tty_flag) {
992 struct winsize ws;
993 char *cp;
994 cp = getenv("TERM");
995 if (!cp)
996 cp = "";
997 /* Store window size in the packet. */
998 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
999 memset(&ws, 0, sizeof(ws));
1000
1001 channel_request_start(id, "pty-req", 0);
1002 packet_put_cstring(cp);
1003 packet_put_int(ws.ws_col);
1004 packet_put_int(ws.ws_row);
1005 packet_put_int(ws.ws_xpixel);
1006 packet_put_int(ws.ws_ypixel);
Ben Lindstromae8e2d32001-04-14 23:13:02 +00001007 tio = get_saved_tio();
1008 tty_make_modes(/*ignored*/ 0, &tio);
Damien Miller1383bd82000-04-06 12:32:37 +10001009 packet_send();
Ben Lindstrombf555ba2001-01-18 02:04:35 +00001010 interactive = 1;
Damien Miller1383bd82000-04-06 12:32:37 +10001011 /* XXX wait for reply */
1012 }
Damien Millerbd483e72000-04-30 10:00:53 +10001013 if (options.forward_x11 &&
1014 getenv("DISPLAY") != NULL) {
1015 char proto[512], data[512];
1016 /* Get reasonable local authentication information. */
1017 x11_get_proto(proto, sizeof proto, data, sizeof data);
1018 /* Request forwarding with authentication spoofing. */
1019 debug("Requesting X11 forwarding with authentication spoofing.");
1020 x11_request_forwarding_with_spoofing(id, proto, data);
Ben Lindstrombf555ba2001-01-18 02:04:35 +00001021 interactive = 1;
Damien Millerbd483e72000-04-30 10:00:53 +10001022 /* XXX wait for reply */
1023 }
1024
Damien Miller0bc1bd82000-11-13 22:57:25 +11001025 check_agent_present();
1026 if (options.forward_agent) {
1027 debug("Requesting authentication agent forwarding.");
1028 channel_request_start(id, "auth-agent-req@openssh.com", 0);
1029 packet_send();
1030 }
1031
Damien Miller1383bd82000-04-06 12:32:37 +10001032 len = buffer_len(&command);
1033 if (len > 0) {
1034 if (len > 900)
1035 len = 900;
Damien Miller832562e2001-01-30 09:30:01 +11001036 if (subsystem_flag) {
1037 debug("Sending subsystem: %.*s", len, buffer_ptr(&command));
Ben Lindstrom1e7d3062001-02-09 02:36:43 +00001038 channel_request_start(id, "subsystem", /*want reply*/ 1);
1039 /* register callback for reply */
1040 /* XXX we asume that client_loop has already been called */
1041 dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &client_subsystem_reply);
1042 dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &client_subsystem_reply);
Damien Miller832562e2001-01-30 09:30:01 +11001043 } else {
1044 debug("Sending command: %.*s", len, buffer_ptr(&command));
1045 channel_request_start(id, "exec", 0);
1046 }
Ben Lindstrom4040fe12001-03-05 06:52:57 +00001047 packet_put_string(buffer_ptr(&command), buffer_len(&command));
Damien Miller1383bd82000-04-06 12:32:37 +10001048 packet_send();
1049 } else {
1050 channel_request(id, "shell", 0);
1051 }
1052 /* channel_callback(id, SSH2_MSG_OPEN_CONFIGMATION, client_init, 0); */
Ben Lindstrom1e7d3062001-02-09 02:36:43 +00001053
Damien Miller1383bd82000-04-06 12:32:37 +10001054 /* register different callback, etc. XXX */
Ben Lindstrombf555ba2001-01-18 02:04:35 +00001055 packet_set_interactive(interactive);
Damien Miller1383bd82000-04-06 12:32:37 +10001056}
1057
1058int
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001059ssh_session2_command(void)
Damien Miller1383bd82000-04-06 12:32:37 +10001060{
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001061 int id, window, packetmax;
Damien Millerad833b32000-08-23 10:46:23 +10001062 int in, out, err;
1063
Damien Millercaf6dd62000-08-29 11:33:50 +11001064 if (stdin_null_flag) {
Ben Lindstrom31ca54a2001-02-09 02:11:24 +00001065 in = open(_PATH_DEVNULL, O_RDONLY);
Damien Millercaf6dd62000-08-29 11:33:50 +11001066 } else {
1067 in = dup(STDIN_FILENO);
1068 }
1069 out = dup(STDOUT_FILENO);
1070 err = dup(STDERR_FILENO);
1071
1072 if (in < 0 || out < 0 || err < 0)
1073 fatal("dup() in/out/err failed");
1074
Damien Miller69b69aa2000-10-28 14:19:58 +11001075 /* enable nonblocking unless tty */
1076 if (!isatty(in))
1077 set_nonblock(in);
1078 if (!isatty(out))
1079 set_nonblock(out);
1080 if (!isatty(err))
1081 set_nonblock(err);
1082
Damien Millere4340be2000-09-16 13:29:08 +11001083 window = CHAN_SES_WINDOW_DEFAULT;
1084 packetmax = CHAN_SES_PACKET_DEFAULT;
1085 if (!tty_flag) {
Damien Miller1383bd82000-04-06 12:32:37 +10001086 window *= 2;
Damien Millere4340be2000-09-16 13:29:08 +11001087 packetmax *=2;
Damien Miller1383bd82000-04-06 12:32:37 +10001088 }
Damien Miller1383bd82000-04-06 12:32:37 +10001089 id = channel_new(
1090 "session", SSH_CHANNEL_OPENING, in, out, err,
Damien Millere4340be2000-09-16 13:29:08 +11001091 window, packetmax, CHAN_EXTENDED_WRITE,
Damien Miller69b69aa2000-10-28 14:19:58 +11001092 xstrdup("client-session"), /*nonblock*/0);
Damien Miller1383bd82000-04-06 12:32:37 +10001093
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001094debug("channel_new: %d", id);
1095
Damien Miller1383bd82000-04-06 12:32:37 +10001096 channel_open(id);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001097 channel_register_callback(id, SSH2_MSG_CHANNEL_OPEN_CONFIRMATION,
1098 ssh_session2_callback, (void *)0);
Damien Miller1383bd82000-04-06 12:32:37 +10001099
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001100 return id;
1101}
1102
1103int
1104ssh_session2(void)
1105{
1106 int id;
1107
1108 /* XXX should be pre-session */
1109 ssh_init_forwarding();
1110
1111 id = no_shell_flag ? -1 : ssh_session2_command();
1112
1113 /* If requested, let ssh continue in the background. */
1114 if (fork_after_authentication_flag)
1115 if (daemon(1, 1) < 0)
1116 fatal("daemon() failed: %.200s", strerror(errno));
1117
Damien Millerad833b32000-08-23 10:46:23 +10001118 return client_loop(tty_flag, tty_flag ? options.escape_char : -1, id);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001119}
Damien Miller0bc1bd82000-11-13 22:57:25 +11001120
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001121void
1122load_public_identity_files(void)
1123{
1124 char *filename;
1125 Key *public;
1126 int i;
1127
1128 for (i = 0; i < options.num_identity_files; i++) {
1129 filename = tilde_expand_filename(options.identity_files[i],
1130 original_real_uid);
Ben Lindstromd0fca422001-03-26 13:44:06 +00001131 public = key_load_public(filename, NULL);
Ben Lindstrom266dfdf2001-03-09 00:12:22 +00001132 debug("identity file %s type %d", filename,
1133 public ? public->type : -1);
1134 xfree(options.identity_files[i]);
1135 options.identity_files[i] = filename;
1136 options.identity_keys[i] = public;
1137 }
1138}