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c3773c6e | 1 | /* $OpenBSD: ssh.c,v 1.329 2009/12/20 07:28:36 guenther Exp $ */ |
8efc0c15 | 2 | /* |
5260325f | 3 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
4 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
5 | * All rights reserved | |
5260325f | 6 | * Ssh client program. This program can be used to log into a remote machine. |
7 | * The software supports strong authentication, encryption, and forwarding | |
8 | * of X11, TCP/IP, and authentication connections. | |
9 | * | |
bcbf86ec | 10 | * As far as I am concerned, the code I have written for this software |
11 | * can be used freely for any purpose. Any derived versions of this | |
12 | * software must be clearly marked as such, and if the derived work is | |
13 | * incompatible with the protocol description in the RFC file, it must be | |
14 | * called by a name other than "ssh" or "Secure Shell". | |
15 | * | |
16 | * Copyright (c) 1999 Niels Provos. All rights reserved. | |
d73a67d7 | 17 | * Copyright (c) 2000, 2001, 2002, 2003 Markus Friedl. All rights reserved. |
bcbf86ec | 18 | * |
19 | * Modified to work with SSL by Niels Provos <provos@citi.umich.edu> | |
20 | * in Canada (German citizen). | |
21 | * | |
22 | * Redistribution and use in source and binary forms, with or without | |
23 | * modification, are permitted provided that the following conditions | |
24 | * are met: | |
25 | * 1. Redistributions of source code must retain the above copyright | |
26 | * notice, this list of conditions and the following disclaimer. | |
27 | * 2. Redistributions in binary form must reproduce the above copyright | |
28 | * notice, this list of conditions and the following disclaimer in the | |
29 | * documentation and/or other materials provided with the distribution. | |
30 | * | |
31 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
32 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
33 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
34 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
35 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
36 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
37 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
38 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
39 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
40 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
5260325f | 41 | */ |
8efc0c15 | 42 | |
43 | #include "includes.h" | |
876faccd | 44 | |
4095f623 | 45 | #include <sys/types.h> |
46 | #ifdef HAVE_SYS_STAT_H | |
47 | # include <sys/stat.h> | |
48 | #endif | |
876faccd | 49 | #include <sys/resource.h> |
bd7c69ea | 50 | #include <sys/ioctl.h> |
0f63ab10 | 51 | #include <sys/param.h> |
5b04a8bf | 52 | #include <sys/socket.h> |
a75f5360 | 53 | |
b6438382 | 54 | #include <ctype.h> |
dd984467 | 55 | #include <errno.h> |
d3221cca | 56 | #include <fcntl.h> |
28cb0a43 | 57 | #include <netdb.h> |
b5b88c19 | 58 | #ifdef HAVE_PATHS_H |
a75f5360 | 59 | #include <paths.h> |
b5b88c19 | 60 | #endif |
b1842393 | 61 | #include <pwd.h> |
ada68823 | 62 | #include <signal.h> |
24436b92 | 63 | #include <stdarg.h> |
bcaab305 | 64 | #include <stddef.h> |
cf851879 | 65 | #include <stdio.h> |
ffa517a8 | 66 | #include <stdlib.h> |
00146caa | 67 | #include <string.h> |
5188ba17 | 68 | #include <unistd.h> |
8efc0c15 | 69 | |
5e837c7b | 70 | #include <netinet/in.h> |
71 | #include <arpa/inet.h> | |
72 | ||
a306f2dd | 73 | #include <openssl/evp.h> |
fa08c86b | 74 | #include <openssl/err.h> |
f5f25d17 | 75 | #include "openbsd-compat/openssl-compat.h" |
3593bdc0 | 76 | #include "openbsd-compat/sys-queue.h" |
a306f2dd | 77 | |
31652869 | 78 | #include "xmalloc.h" |
8efc0c15 | 79 | #include "ssh.h" |
42f11eb2 | 80 | #include "ssh1.h" |
81 | #include "ssh2.h" | |
82 | #include "compat.h" | |
83 | #include "cipher.h" | |
8efc0c15 | 84 | #include "packet.h" |
85 | #include "buffer.h" | |
a5efa1bb | 86 | #include "channels.h" |
a306f2dd | 87 | #include "key.h" |
4c8722d9 | 88 | #include "authfd.h" |
a306f2dd | 89 | #include "authfile.h" |
42f11eb2 | 90 | #include "pathnames.h" |
5e96b616 | 91 | #include "dispatch.h" |
b5c334cc | 92 | #include "clientloop.h" |
42f11eb2 | 93 | #include "log.h" |
94 | #include "readconf.h" | |
95 | #include "sshconnect.h" | |
42f11eb2 | 96 | #include "misc.h" |
b2552997 | 97 | #include "kex.h" |
98 | #include "mac.h" | |
07d80252 | 99 | #include "sshpty.h" |
61a2c1da | 100 | #include "match.h" |
5e96b616 | 101 | #include "msg.h" |
6213295d | 102 | #include "uidswap.h" |
1cb94277 | 103 | #include "roaming.h" |
28015df4 | 104 | #include "version.h" |
8efc0c15 | 105 | |
383546c4 | 106 | #ifdef SMARTCARD |
383546c4 | 107 | #include "scard.h" |
dd2495cb | 108 | #endif |
383546c4 | 109 | |
f601d847 | 110 | extern char *__progname; |
f601d847 | 111 | |
e8097dc9 | 112 | /* Flag indicating whether debug mode is on. May be set on the command line. */ |
8efc0c15 | 113 | int debug_flag = 0; |
114 | ||
a8be9f80 | 115 | /* Flag indicating whether a tty should be allocated */ |
8efc0c15 | 116 | int tty_flag = 0; |
8abcdba4 | 117 | int no_tty_flag = 0; |
118 | int force_tty_flag = 0; | |
8efc0c15 | 119 | |
8ce64345 | 120 | /* don't exec a shell */ |
121 | int no_shell_flag = 0; | |
8ce64345 | 122 | |
aa3378df | 123 | /* |
124 | * Flag indicating that nothing should be read from stdin. This can be set | |
125 | * on the command line. | |
126 | */ | |
8efc0c15 | 127 | int stdin_null_flag = 0; |
128 | ||
aa3378df | 129 | /* |
130 | * Flag indicating that ssh should fork after authentication. This is useful | |
c242fc96 | 131 | * so that the passphrase can be entered manually, and then ssh goes to the |
aa3378df | 132 | * background. |
133 | */ | |
8efc0c15 | 134 | int fork_after_authentication_flag = 0; |
135 | ||
aa3378df | 136 | /* |
137 | * General data structure for command line options and options configurable | |
138 | * in configuration files. See readconf.h. | |
139 | */ | |
8efc0c15 | 140 | Options options; |
141 | ||
e591b98a | 142 | /* optional user configfile */ |
143 | char *config = NULL; | |
144 | ||
aa3378df | 145 | /* |
146 | * Name of the host we are connecting to. This is the name given on the | |
147 | * command line, or the HostName specified for the user-supplied name in a | |
148 | * configuration file. | |
149 | */ | |
8efc0c15 | 150 | char *host; |
151 | ||
152 | /* socket address the host resolves to */ | |
48e671d5 | 153 | struct sockaddr_storage hostaddr; |
8efc0c15 | 154 | |
8002af61 | 155 | /* Private host keys. */ |
39c00dc2 | 156 | Sensitive sensitive_data; |
8efc0c15 | 157 | |
158 | /* Original real UID. */ | |
159 | uid_t original_real_uid; | |
3fb156df | 160 | uid_t original_effective_uid; |
8efc0c15 | 161 | |
8ce64345 | 162 | /* command to be executed */ |
163 | Buffer command; | |
164 | ||
ae810de7 | 165 | /* Should we execute a command or invoke a subsystem? */ |
166 | int subsystem_flag = 0; | |
167 | ||
e0ae8728 | 168 | /* # of replies received for global requests */ |
72becb62 | 169 | static int remote_forward_confirms_received = 0; |
e0ae8728 | 170 | |
6939bbd4 | 171 | /* pid of proxycommand child process */ |
172 | pid_t proxy_command_pid = 0; | |
173 | ||
3bcced4c | 174 | /* mux.c */ |
175 | extern int muxserver_sock; | |
176 | extern u_int muxclient_command; | |
5e96b616 | 177 | |
8efc0c15 | 178 | /* Prints a help message to the user. This function never returns. */ |
179 | ||
396c147e | 180 | static void |
5ca51e19 | 181 | usage(void) |
8efc0c15 | 182 | { |
182ccbba | 183 | fprintf(stderr, |
f3a4d0d0 | 184 | "usage: ssh [-1246AaCfgKkMNnqsTtVvXxYy] [-b bind_address] [-c cipher_spec]\n" |
80e29ee6 | 185 | " [-D [bind_address:]port] [-e escape_char] [-F configfile]\n" |
8cf98c65 | 186 | " [-i identity_file] [-L [bind_address:]port:host:hostport]\n" |
3867aa0a | 187 | " [-l login_name] [-m mac_spec] [-O ctl_cmd] [-o option] [-p port]\n" |
8cf98c65 | 188 | " [-R [bind_address:]port:host:hostport] [-S ctl_path]\n" |
06fa4ac1 | 189 | " [-w local_tun[:remote_tun]] [user@]hostname [command]\n" |
182ccbba | 190 | ); |
3aa43b24 | 191 | exit(255); |
8efc0c15 | 192 | } |
193 | ||
396c147e | 194 | static int ssh_session(void); |
195 | static int ssh_session2(void); | |
196 | static void load_public_identity_files(void); | |
3bcced4c | 197 | |
198 | /* from muxclient.c */ | |
199 | void muxclient(const char *); | |
200 | void muxserver_listen(void); | |
8ce64345 | 201 | |
5260325f | 202 | /* |
203 | * Main program for the ssh client. | |
204 | */ | |
8efc0c15 | 205 | int |
206 | main(int ac, char **av) | |
207 | { | |
0f63ab10 | 208 | int i, r, opt, exit_status, use_syslog; |
209 | char *p, *cp, *line, *argv0, buf[MAXPATHLEN]; | |
5260325f | 210 | struct stat st; |
3b1a83df | 211 | struct passwd *pw; |
71300a43 | 212 | int dummy, timeout_ms; |
57dade33 | 213 | extern int optind, optreset; |
1812a662 | 214 | extern char *optarg; |
c1cbe68a | 215 | struct servent *sp; |
3867aa0a | 216 | Forward fwd; |
5260325f | 217 | |
fd6168c1 | 218 | /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ |
219 | sanitise_stdfd(); | |
220 | ||
fda04d7d | 221 | __progname = ssh_get_progname(av[0]); |
264dce47 | 222 | init_rng(); |
223 | ||
aa3378df | 224 | /* |
225 | * Save the original real uid. It will be needed later (uid-swapping | |
226 | * may clobber the real uid). | |
227 | */ | |
5260325f | 228 | original_real_uid = getuid(); |
229 | original_effective_uid = geteuid(); | |
aff51935 | 230 | |
9f324470 | 231 | /* |
232 | * Use uid-swapping to give up root privileges for the duration of | |
233 | * option processing. We will re-instantiate the rights when we are | |
234 | * ready to create the privileged port, and will permanently drop | |
235 | * them when the port has been created (actually, when the connection | |
236 | * has been made, as we may need to create the port several times). | |
237 | */ | |
238 | PRIV_END; | |
5260325f | 239 | |
7322ef0e | 240 | #ifdef HAVE_SETRLIMIT |
5260325f | 241 | /* If we are installed setuid root be careful to not drop core. */ |
242 | if (original_real_uid != original_effective_uid) { | |
243 | struct rlimit rlim; | |
244 | rlim.rlim_cur = rlim.rlim_max = 0; | |
245 | if (setrlimit(RLIMIT_CORE, &rlim) < 0) | |
246 | fatal("setrlimit failed: %.100s", strerror(errno)); | |
8efc0c15 | 247 | } |
3c62e7eb | 248 | #endif |
63bd8c36 | 249 | /* Get user data. */ |
250 | pw = getpwuid(original_real_uid); | |
251 | if (!pw) { | |
bbe88b6d | 252 | logit("You don't exist, go away!"); |
3aa43b24 | 253 | exit(255); |
63bd8c36 | 254 | } |
255 | /* Take a copy of the returned structure. */ | |
256 | pw = pwcopy(pw); | |
257 | ||
aa3378df | 258 | /* |
259 | * Set our umask to something reasonable, as some files are created | |
260 | * with the default umask. This will make them world-readable but | |
261 | * writable only by the owner, which is ok for all files for which we | |
262 | * don't set the modes explicitly. | |
263 | */ | |
5260325f | 264 | umask(022); |
265 | ||
e8097dc9 | 266 | /* |
267 | * Initialize option structure to indicate that no values have been | |
268 | * set. | |
269 | */ | |
5260325f | 270 | initialize_options(&options); |
271 | ||
272 | /* Parse command-line arguments. */ | |
273 | host = NULL; | |
bf793210 | 274 | use_syslog = 0; |
f0956980 | 275 | argv0 = av[0]; |
5260325f | 276 | |
16a5525d | 277 | again: |
e8097dc9 | 278 | while ((opt = getopt(ac, av, "1246ab:c:e:fgi:kl:m:no:p:qstvx" |
bf793210 | 279 | "ACD:F:I:KL:MNO:PR:S:TVw:XYy")) != -1) { |
5260325f | 280 | switch (opt) { |
1f3bf5aa | 281 | case '1': |
282 | options.protocol = SSH_PROTO_1; | |
283 | break; | |
6ae2364d | 284 | case '2': |
285 | options.protocol = SSH_PROTO_2; | |
286 | break; | |
48e671d5 | 287 | case '4': |
1572b90f | 288 | options.address_family = AF_INET; |
48e671d5 | 289 | break; |
48e671d5 | 290 | case '6': |
1572b90f | 291 | options.address_family = AF_INET6; |
48e671d5 | 292 | break; |
5260325f | 293 | case 'n': |
294 | stdin_null_flag = 1; | |
295 | break; | |
5260325f | 296 | case 'f': |
297 | fork_after_authentication_flag = 1; | |
298 | stdin_null_flag = 1; | |
299 | break; | |
5260325f | 300 | case 'x': |
301 | options.forward_x11 = 0; | |
302 | break; | |
5260325f | 303 | case 'X': |
304 | options.forward_x11 = 1; | |
305 | break; | |
bf793210 | 306 | case 'y': |
307 | use_syslog = 1; | |
308 | break; | |
d73a67d7 | 309 | case 'Y': |
310 | options.forward_x11 = 1; | |
311 | options.forward_x11_trusted = 1; | |
312 | break; | |
5260325f | 313 | case 'g': |
314 | options.gateway_ports = 1; | |
315 | break; | |
f8c6db83 | 316 | case 'O': |
317 | if (strcmp(optarg, "check") == 0) | |
3bcced4c | 318 | muxclient_command = SSHMUX_COMMAND_ALIVE_CHECK; |
f8c6db83 | 319 | else if (strcmp(optarg, "exit") == 0) |
3bcced4c | 320 | muxclient_command = SSHMUX_COMMAND_TERMINATE; |
f8c6db83 | 321 | else |
322 | fatal("Invalid multiplex command."); | |
323 | break; | |
e59404d1 | 324 | case 'P': /* deprecated */ |
5260325f | 325 | options.use_privileged_port = 0; |
326 | break; | |
5260325f | 327 | case 'a': |
328 | options.forward_agent = 0; | |
329 | break; | |
71276795 | 330 | case 'A': |
331 | options.forward_agent = 1; | |
332 | break; | |
5260325f | 333 | case 'k': |
f7926e97 | 334 | options.gss_deleg_creds = 0; |
5260325f | 335 | break; |
b2f4d5cc | 336 | case 'K': |
337 | options.gss_authentication = 1; | |
338 | options.gss_deleg_creds = 1; | |
339 | break; | |
5260325f | 340 | case 'i': |
341 | if (stat(optarg, &st) < 0) { | |
f5a1a01a | 342 | fprintf(stderr, "Warning: Identity file %s " |
ec304d66 | 343 | "not accessible: %s.\n", optarg, |
344 | strerror(errno)); | |
5260325f | 345 | break; |
346 | } | |
f5a1a01a | 347 | if (options.num_identity_files >= |
348 | SSH_MAX_IDENTITY_FILES) | |
349 | fatal("Too many identity files specified " | |
350 | "(max %d)", SSH_MAX_IDENTITY_FILES); | |
351 | options.identity_files[options.num_identity_files++] = | |
352 | xstrdup(optarg); | |
5260325f | 353 | break; |
383546c4 | 354 | case 'I': |
355 | #ifdef SMARTCARD | |
9ff6f66f | 356 | options.smartcard_device = xstrdup(optarg); |
dd2495cb | 357 | #else |
383546c4 | 358 | fprintf(stderr, "no support for smartcards.\n"); |
dd2495cb | 359 | #endif |
383546c4 | 360 | break; |
5260325f | 361 | case 't': |
8abcdba4 | 362 | if (tty_flag) |
363 | force_tty_flag = 1; | |
5260325f | 364 | tty_flag = 1; |
365 | break; | |
5260325f | 366 | case 'v': |
e053cd2c | 367 | if (debug_flag == 0) { |
bcbf86ec | 368 | debug_flag = 1; |
369 | options.log_level = SYSLOG_LEVEL_DEBUG1; | |
e053cd2c | 370 | } else { |
371 | if (options.log_level < SYSLOG_LEVEL_DEBUG3) | |
372 | options.log_level++; | |
bcbf86ec | 373 | break; |
e053cd2c | 374 | } |
59d4718a | 375 | /* FALLTHROUGH */ |
5260325f | 376 | case 'V': |
85ac7a84 | 377 | fprintf(stderr, "%s, %s\n", |
4526e8c2 | 378 | SSH_RELEASE, SSLeay_version(SSLEAY_VERSION)); |
5260325f | 379 | if (opt == 'V') |
380 | exit(0); | |
5260325f | 381 | break; |
d20f3c9e | 382 | case 'w': |
a4f24bf8 | 383 | if (options.tun_open == -1) |
384 | options.tun_open = SSH_TUNMODE_DEFAULT; | |
d20f3c9e | 385 | options.tun_local = a2tun(optarg, &options.tun_remote); |
a4f24bf8 | 386 | if (options.tun_local == SSH_TUNID_ERR) { |
e8097dc9 | 387 | fprintf(stderr, |
388 | "Bad tun device '%s'\n", optarg); | |
3aa43b24 | 389 | exit(255); |
d20f3c9e | 390 | } |
391 | break; | |
5260325f | 392 | case 'q': |
393 | options.log_level = SYSLOG_LEVEL_QUIET; | |
394 | break; | |
5260325f | 395 | case 'e': |
396 | if (optarg[0] == '^' && optarg[2] == 0 && | |
f5a1a01a | 397 | (u_char) optarg[1] >= 64 && |
398 | (u_char) optarg[1] < 128) | |
1e3b8b07 | 399 | options.escape_char = (u_char) optarg[1] & 31; |
5260325f | 400 | else if (strlen(optarg) == 1) |
1e3b8b07 | 401 | options.escape_char = (u_char) optarg[0]; |
5260325f | 402 | else if (strcmp(optarg, "none") == 0) |
4bf9c10e | 403 | options.escape_char = SSH_ESCAPECHAR_NONE; |
5260325f | 404 | else { |
f5a1a01a | 405 | fprintf(stderr, "Bad escape character '%s'.\n", |
406 | optarg); | |
3aa43b24 | 407 | exit(255); |
5260325f | 408 | } |
409 | break; | |
5260325f | 410 | case 'c': |
a306f2dd | 411 | if (ciphers_valid(optarg)) { |
412 | /* SSH2 only */ | |
413 | options.ciphers = xstrdup(optarg); | |
d77347cc | 414 | options.cipher = SSH_CIPHER_INVALID; |
a306f2dd | 415 | } else { |
416 | /* SSH1 only */ | |
c523303b | 417 | options.cipher = cipher_number(optarg); |
418 | if (options.cipher == -1) { | |
f5a1a01a | 419 | fprintf(stderr, |
420 | "Unknown cipher type '%s'\n", | |
421 | optarg); | |
3aa43b24 | 422 | exit(255); |
a306f2dd | 423 | } |
f5a1a01a | 424 | if (options.cipher == SSH_CIPHER_3DES) |
c523303b | 425 | options.ciphers = "3des-cbc"; |
f5a1a01a | 426 | else if (options.cipher == SSH_CIPHER_BLOWFISH) |
c523303b | 427 | options.ciphers = "blowfish-cbc"; |
f5a1a01a | 428 | else |
c523303b | 429 | options.ciphers = (char *)-1; |
5260325f | 430 | } |
431 | break; | |
b2552997 | 432 | case 'm': |
433 | if (mac_valid(optarg)) | |
434 | options.macs = xstrdup(optarg); | |
435 | else { | |
f5a1a01a | 436 | fprintf(stderr, "Unknown mac type '%s'\n", |
437 | optarg); | |
3aa43b24 | 438 | exit(255); |
b2552997 | 439 | } |
440 | break; | |
5e96b616 | 441 | case 'M': |
9dfd96d6 | 442 | if (options.control_master == SSHCTL_MASTER_YES) |
443 | options.control_master = SSHCTL_MASTER_ASK; | |
444 | else | |
445 | options.control_master = SSHCTL_MASTER_YES; | |
5e96b616 | 446 | break; |
5260325f | 447 | case 'p': |
2d2a2c65 | 448 | options.port = a2port(optarg); |
5134115d | 449 | if (options.port <= 0) { |
6031af8d | 450 | fprintf(stderr, "Bad port '%s'\n", optarg); |
3aa43b24 | 451 | exit(255); |
6031af8d | 452 | } |
5260325f | 453 | break; |
5260325f | 454 | case 'l': |
455 | options.user = optarg; | |
456 | break; | |
d2e3df16 | 457 | |
458 | case 'L': | |
17525a70 | 459 | if (parse_forward(&fwd, optarg, 0, 0)) |
3867aa0a | 460 | add_local_forward(&options, &fwd); |
461 | else { | |
f5a1a01a | 462 | fprintf(stderr, |
3867aa0a | 463 | "Bad local forwarding specification '%s'\n", |
f5a1a01a | 464 | optarg); |
3aa43b24 | 465 | exit(255); |
5260325f | 466 | } |
3867aa0a | 467 | break; |
468 | ||
469 | case 'R': | |
17525a70 | 470 | if (parse_forward(&fwd, optarg, 0, 1)) { |
3867aa0a | 471 | add_remote_forward(&options, &fwd); |
472 | } else { | |
f5a1a01a | 473 | fprintf(stderr, |
3867aa0a | 474 | "Bad remote forwarding specification " |
475 | "'%s'\n", optarg); | |
3aa43b24 | 476 | exit(255); |
5260325f | 477 | } |
5260325f | 478 | break; |
0490e609 | 479 | |
480 | case 'D': | |
17525a70 | 481 | if (parse_forward(&fwd, optarg, 1, 0)) { |
30573fea | 482 | add_local_forward(&options, &fwd); |
3867aa0a | 483 | } else { |
30573fea | 484 | fprintf(stderr, |
485 | "Bad dynamic forwarding specification " | |
486 | "'%s'\n", optarg); | |
3aa43b24 | 487 | exit(255); |
6031af8d | 488 | } |
0490e609 | 489 | break; |
490 | ||
5260325f | 491 | case 'C': |
492 | options.compression = 1; | |
493 | break; | |
8ce64345 | 494 | case 'N': |
495 | no_shell_flag = 1; | |
496 | no_tty_flag = 1; | |
497 | break; | |
8ce64345 | 498 | case 'T': |
499 | no_tty_flag = 1; | |
500 | break; | |
5260325f | 501 | case 'o': |
502 | dummy = 1; | |
1aafd17a | 503 | line = xstrdup(optarg); |
f5a1a01a | 504 | if (process_config_line(&options, host ? host : "", |
1aafd17a | 505 | line, "command-line", 0, &dummy) != 0) |
3aa43b24 | 506 | exit(255); |
1aafd17a | 507 | xfree(line); |
5260325f | 508 | break; |
ae810de7 | 509 | case 's': |
510 | subsystem_flag = 1; | |
511 | break; | |
5e96b616 | 512 | case 'S': |
513 | if (options.control_path != NULL) | |
514 | free(options.control_path); | |
515 | options.control_path = xstrdup(optarg); | |
5e96b616 | 516 | break; |
3435f5a6 | 517 | case 'b': |
518 | options.bind_address = optarg; | |
519 | break; | |
e591b98a | 520 | case 'F': |
521 | config = optarg; | |
522 | break; | |
5260325f | 523 | default: |
524 | usage(); | |
525 | } | |
526 | } | |
527 | ||
f5a1a01a | 528 | ac -= optind; |
529 | av += optind; | |
530 | ||
c3773c6e | 531 | if (ac > 0 && !host) { |
15748b4d | 532 | if (strrchr(*av, '@')) { |
f5a1a01a | 533 | p = xstrdup(*av); |
15748b4d | 534 | cp = strrchr(p, '@'); |
f5a1a01a | 535 | if (cp == NULL || cp == p) |
536 | usage(); | |
537 | options.user = p; | |
538 | *cp = '\0'; | |
539 | host = ++cp; | |
540 | } else | |
541 | host = *av; | |
978ebf99 | 542 | if (ac > 1) { |
543 | optind = optreset = 1; | |
f5a1a01a | 544 | goto again; |
545 | } | |
978ebf99 | 546 | ac--, av++; |
f5a1a01a | 547 | } |
548 | ||
5260325f | 549 | /* Check that we got a host name. */ |
550 | if (!host) | |
8efc0c15 | 551 | usage(); |
5260325f | 552 | |
22d89d24 | 553 | SSLeay_add_all_algorithms(); |
fa08c86b | 554 | ERR_load_crypto_strings(); |
22d89d24 | 555 | |
5260325f | 556 | /* Initialize the command to execute on remote host. */ |
557 | buffer_init(&command); | |
558 | ||
aa3378df | 559 | /* |
560 | * Save the command to execute on the remote host in a buffer. There | |
561 | * is no limit on the length of the command, except by the maximum | |
562 | * packet size. Also sets the tty flag if there is no command. | |
563 | */ | |
f5a1a01a | 564 | if (!ac) { |
5260325f | 565 | /* No command specified - execute shell on a tty. */ |
566 | tty_flag = 1; | |
ae810de7 | 567 | if (subsystem_flag) { |
f5a1a01a | 568 | fprintf(stderr, |
569 | "You must specify a subsystem to invoke.\n"); | |
ae810de7 | 570 | usage(); |
571 | } | |
5260325f | 572 | } else { |
f5a1a01a | 573 | /* A command has been specified. Store it into the buffer. */ |
574 | for (i = 0; i < ac; i++) { | |
575 | if (i) | |
5260325f | 576 | buffer_append(&command, " ", 1); |
577 | buffer_append(&command, av[i], strlen(av[i])); | |
578 | } | |
8efc0c15 | 579 | } |
5260325f | 580 | |
581 | /* Cannot fork to background if no command. */ | |
e8097dc9 | 582 | if (fork_after_authentication_flag && buffer_len(&command) == 0 && |
583 | !no_shell_flag) | |
584 | fatal("Cannot fork into background without a command " | |
585 | "to execute."); | |
5260325f | 586 | |
587 | /* Allocate a tty by default if no command specified. */ | |
588 | if (buffer_len(&command) == 0) | |
589 | tty_flag = 1; | |
590 | ||
343288b8 | 591 | /* Force no tty */ |
0b6fbf03 | 592 | if (no_tty_flag) |
593 | tty_flag = 0; | |
5260325f | 594 | /* Do not allocate a tty if stdin is not a tty. */ |
7697ac2b | 595 | if ((!isatty(fileno(stdin)) || stdin_null_flag) && !force_tty_flag) { |
5260325f | 596 | if (tty_flag) |
e8097dc9 | 597 | logit("Pseudo-terminal will not be allocated because " |
598 | "stdin is not a terminal."); | |
5260325f | 599 | tty_flag = 0; |
600 | } | |
8ce64345 | 601 | |
20244695 | 602 | /* |
603 | * Initialize "log" output. Since we are the client all output | |
604 | * actually goes to stderr. | |
605 | */ | |
f0956980 | 606 | log_init(argv0, |
e8097dc9 | 607 | options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level, |
bf793210 | 608 | SYSLOG_FACILITY_USER, !use_syslog); |
5260325f | 609 | |
e591b98a | 610 | /* |
611 | * Read per-user configuration file. Ignore the system wide config | |
612 | * file if the user specifies a config file on the command line. | |
613 | */ | |
614 | if (config != NULL) { | |
f7f14143 | 615 | if (!read_config_file(config, host, &options, 0)) |
93111dfa | 616 | fatal("Can't open user config file %.100s: " |
617 | "%.100s", config, strerror(errno)); | |
4f6e2ba9 | 618 | } else { |
0f63ab10 | 619 | r = snprintf(buf, sizeof buf, "%s/%s", pw->pw_dir, |
e591b98a | 620 | _PATH_SSH_USER_CONFFILE); |
0f63ab10 | 621 | if (r > 0 && (size_t)r < sizeof(buf)) |
622 | (void)read_config_file(buf, host, &options, 1); | |
e591b98a | 623 | |
f67792f2 | 624 | /* Read systemwide configuration file after use config. */ |
f2107e97 | 625 | (void)read_config_file(_PATH_HOST_CONFIG_FILE, host, |
9f6cab4b | 626 | &options, 0); |
e591b98a | 627 | } |
5260325f | 628 | |
629 | /* Fill configuration defaults. */ | |
630 | fill_default_options(&options); | |
631 | ||
1572b90f | 632 | channel_set_af(options.address_family); |
fe7dba42 | 633 | channel_set_rdomain(options.rdomain); |
1572b90f | 634 | |
5260325f | 635 | /* reinit */ |
f0956980 | 636 | log_init(argv0, options.log_level, SYSLOG_FACILITY_USER, !use_syslog); |
5260325f | 637 | |
e339aa53 | 638 | seed_rng(); |
639 | ||
5260325f | 640 | if (options.user == NULL) |
641 | options.user = xstrdup(pw->pw_name); | |
642 | ||
e9d0b573 | 643 | /* Get default port if port has not been set. */ |
644 | if (options.port == 0) { | |
645 | sp = getservbyname(SSH_SERVICE_NAME, "tcp"); | |
646 | options.port = sp ? ntohs(sp->s_port) : SSH_DEFAULT_PORT; | |
647 | } | |
648 | ||
649 | if (options.local_command != NULL) { | |
650 | char thishost[NI_MAXHOST]; | |
651 | ||
652 | if (gethostname(thishost, sizeof(thishost)) == -1) | |
653 | fatal("gethostname: %s", strerror(errno)); | |
654 | snprintf(buf, sizeof(buf), "%d", options.port); | |
655 | debug3("expanding LocalCommand: %s", options.local_command); | |
656 | cp = options.local_command; | |
657 | options.local_command = percent_expand(cp, "d", pw->pw_dir, | |
658 | "h", options.hostname? options.hostname : host, | |
659 | "l", thishost, "n", host, "r", options.user, "p", buf, | |
660 | "u", pw->pw_name, (char *)NULL); | |
661 | debug3("expanded LocalCommand: %s", options.local_command); | |
662 | xfree(cp); | |
663 | } | |
664 | ||
5260325f | 665 | if (options.hostname != NULL) |
666 | host = options.hostname; | |
667 | ||
03c82656 | 668 | /* force lowercase for hostkey matching */ |
669 | if (options.host_key_alias != NULL) { | |
670 | for (p = options.host_key_alias; *p; p++) | |
671 | if (isupper(*p)) | |
9555d258 | 672 | *p = (char)tolower(*p); |
03c82656 | 673 | } |
674 | ||
f78bde70 | 675 | if (options.proxy_command != NULL && |
d0420e01 | 676 | strcmp(options.proxy_command, "none") == 0) { |
677 | xfree(options.proxy_command); | |
f78bde70 | 678 | options.proxy_command = NULL; |
d0420e01 | 679 | } |
699255b5 | 680 | if (options.control_path != NULL && |
d0420e01 | 681 | strcmp(options.control_path, "none") == 0) { |
682 | xfree(options.control_path); | |
699255b5 | 683 | options.control_path = NULL; |
d0420e01 | 684 | } |
f78bde70 | 685 | |
5e96b616 | 686 | if (options.control_path != NULL) { |
8cffe22a | 687 | char thishost[NI_MAXHOST]; |
f7b8224d | 688 | |
8cffe22a | 689 | if (gethostname(thishost, sizeof(thishost)) == -1) |
f7b8224d | 690 | fatal("gethostname: %s", strerror(errno)); |
a980cbd7 | 691 | snprintf(buf, sizeof(buf), "%d", options.port); |
692 | cp = tilde_expand_filename(options.control_path, | |
693 | original_real_uid); | |
d0420e01 | 694 | xfree(options.control_path); |
a980cbd7 | 695 | options.control_path = percent_expand(cp, "p", buf, "h", host, |
8cffe22a | 696 | "r", options.user, "l", thishost, (char *)NULL); |
a980cbd7 | 697 | xfree(cp); |
5e96b616 | 698 | } |
3bcced4c | 699 | if (muxclient_command != 0 && options.control_path == NULL) |
19186c3d | 700 | fatal("No ControlPath specified for \"-O\" command"); |
9dfd96d6 | 701 | if (options.control_path != NULL) |
3bcced4c | 702 | muxclient(options.control_path); |
5e96b616 | 703 | |
71300a43 | 704 | timeout_ms = options.connection_timeout * 1000; |
705 | ||
6ffc9c88 | 706 | /* Open a connection to the remote host. */ |
1572b90f | 707 | if (ssh_connect(host, &hostaddr, options.port, |
71300a43 | 708 | options.address_family, options.connection_attempts, &timeout_ms, |
709 | options.tcp_keep_alive, | |
d514c907 | 710 | #ifdef HAVE_CYGWIN |
711 | options.use_privileged_port, | |
712 | #else | |
3fb156df | 713 | original_effective_uid == 0 && options.use_privileged_port, |
d514c907 | 714 | #endif |
de60473e | 715 | options.proxy_command) != 0) |
3aa43b24 | 716 | exit(255); |
5260325f | 717 | |
71300a43 | 718 | if (timeout_ms > 0) |
719 | debug3("timeout: %d ms remain after connect", timeout_ms); | |
720 | ||
aa3378df | 721 | /* |
722 | * If we successfully made the connection, load the host private key | |
723 | * in case we will need it later for combined rsa-rhosts | |
724 | * authentication. This must be done before releasing extra | |
725 | * privileges, because the file is only readable by root. | |
78660ed4 | 726 | * If we cannot access the private keys, load the public keys |
727 | * instead and try to execute the ssh-keysign helper instead. | |
aa3378df | 728 | */ |
8002af61 | 729 | sensitive_data.nkeys = 0; |
730 | sensitive_data.keys = NULL; | |
39c00dc2 | 731 | sensitive_data.external_keysign = 0; |
b34bec32 | 732 | if (options.rhosts_rsa_authentication || |
733 | options.hostbased_authentication) { | |
8002af61 | 734 | sensitive_data.nkeys = 3; |
19e79961 | 735 | sensitive_data.keys = xcalloc(sensitive_data.nkeys, |
343288b8 | 736 | sizeof(Key)); |
3fb156df | 737 | |
738 | PRIV_START; | |
8002af61 | 739 | sensitive_data.keys[0] = key_load_private_type(KEY_RSA1, |
fc231518 | 740 | _PATH_HOST_KEY_FILE, "", NULL, NULL); |
8002af61 | 741 | sensitive_data.keys[1] = key_load_private_type(KEY_DSA, |
fc231518 | 742 | _PATH_HOST_DSA_KEY_FILE, "", NULL, NULL); |
8002af61 | 743 | sensitive_data.keys[2] = key_load_private_type(KEY_RSA, |
fc231518 | 744 | _PATH_HOST_RSA_KEY_FILE, "", NULL, NULL); |
3fb156df | 745 | PRIV_END; |
39c00dc2 | 746 | |
60cd0a97 | 747 | if (options.hostbased_authentication == 1 && |
748 | sensitive_data.keys[0] == NULL && | |
39c00dc2 | 749 | sensitive_data.keys[1] == NULL && |
750 | sensitive_data.keys[2] == NULL) { | |
751 | sensitive_data.keys[1] = key_load_public( | |
752 | _PATH_HOST_DSA_KEY_FILE, NULL); | |
753 | sensitive_data.keys[2] = key_load_public( | |
754 | _PATH_HOST_RSA_KEY_FILE, NULL); | |
755 | sensitive_data.external_keysign = 1; | |
756 | } | |
5260325f | 757 | } |
aa3378df | 758 | /* |
759 | * Get rid of any extra privileges that we may have. We will no | |
760 | * longer need them. Also, extra privileges could make it very hard | |
761 | * to read identity files and other non-world-readable files from the | |
762 | * user's home directory if it happens to be on a NFS volume where | |
763 | * root is mapped to nobody. | |
764 | */ | |
6213295d | 765 | if (original_effective_uid == 0) { |
766 | PRIV_START; | |
767 | permanently_set_uid(pw); | |
768 | } | |
5260325f | 769 | |
aa3378df | 770 | /* |
771 | * Now that we are back to our own permissions, create ~/.ssh | |
7b9b0103 | 772 | * directory if it doesn't already exist. |
aa3378df | 773 | */ |
0f63ab10 | 774 | r = snprintf(buf, sizeof buf, "%s%s%s", pw->pw_dir, |
e8097dc9 | 775 | strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR); |
0f63ab10 | 776 | if (r > 0 && (size_t)r < sizeof(buf) && stat(buf, &st) < 0) |
704b1659 | 777 | if (mkdir(buf, 0700) < 0) |
5260325f | 778 | error("Could not create directory '%.200s'.", buf); |
779 | ||
fee56204 | 780 | /* load options.identity_files */ |
781 | load_public_identity_files(); | |
782 | ||
783 | /* Expand ~ in known host file names. */ | |
784 | /* XXX mem-leaks: */ | |
fa08c86b | 785 | options.system_hostfile = |
786 | tilde_expand_filename(options.system_hostfile, original_real_uid); | |
787 | options.user_hostfile = | |
788 | tilde_expand_filename(options.user_hostfile, original_real_uid); | |
789 | options.system_hostfile2 = | |
790 | tilde_expand_filename(options.system_hostfile2, original_real_uid); | |
791 | options.user_hostfile2 = | |
792 | tilde_expand_filename(options.user_hostfile2, original_real_uid); | |
5260325f | 793 | |
67b75437 | 794 | signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */ |
795 | ||
e8097dc9 | 796 | /* Log into the remote system. Never returns if the login fails. */ |
71300a43 | 797 | ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr, |
798 | pw, timeout_ms); | |
8002af61 | 799 | |
800 | /* We no longer need the private host keys. Clear them now. */ | |
801 | if (sensitive_data.nkeys != 0) { | |
802 | for (i = 0; i < sensitive_data.nkeys; i++) { | |
803 | if (sensitive_data.keys[i] != NULL) { | |
804 | /* Destroys contents safely */ | |
805 | debug3("clear hostkey %d", i); | |
806 | key_free(sensitive_data.keys[i]); | |
807 | sensitive_data.keys[i] = NULL; | |
808 | } | |
809 | } | |
810 | xfree(sensitive_data.keys); | |
811 | } | |
05b7537a | 812 | for (i = 0; i < options.num_identity_files; i++) { |
813 | if (options.identity_files[i]) { | |
814 | xfree(options.identity_files[i]); | |
815 | options.identity_files[i] = NULL; | |
816 | } | |
817 | if (options.identity_keys[i]) { | |
818 | key_free(options.identity_keys[i]); | |
819 | options.identity_keys[i] = NULL; | |
820 | } | |
821 | } | |
5260325f | 822 | |
8ce64345 | 823 | exit_status = compat20 ? ssh_session2() : ssh_session(); |
824 | packet_close(); | |
6939bbd4 | 825 | |
3bcced4c | 826 | if (options.control_path != NULL && muxserver_sock != -1) |
5e96b616 | 827 | unlink(options.control_path); |
828 | ||
6939bbd4 | 829 | /* |
aff51935 | 830 | * Send SIGHUP to proxy command if used. We don't wait() in |
6939bbd4 | 831 | * case it hangs and instead rely on init to reap the child |
832 | */ | |
833 | if (proxy_command_pid > 1) | |
834 | kill(proxy_command_pid, SIGHUP); | |
835 | ||
8ce64345 | 836 | return exit_status; |
837 | } | |
838 | ||
72becb62 | 839 | /* Callback for remote forward global requests */ |
840 | static void | |
841 | ssh_confirm_remote_forward(int type, u_int32_t seq, void *ctxt) | |
842 | { | |
843 | Forward *rfwd = (Forward *)ctxt; | |
844 | ||
17525a70 | 845 | /* XXX verbose() on failure? */ |
72becb62 | 846 | debug("remote forward %s for: listen %d, connect %s:%d", |
847 | type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure", | |
848 | rfwd->listen_port, rfwd->connect_host, rfwd->connect_port); | |
17525a70 | 849 | if (type == SSH2_MSG_REQUEST_SUCCESS && rfwd->listen_port == 0) { |
850 | logit("Allocated port %u for remote forward to %s:%d", | |
851 | packet_get_int(), | |
852 | rfwd->connect_host, rfwd->connect_port); | |
853 | } | |
854 | ||
72becb62 | 855 | if (type == SSH2_MSG_REQUEST_FAILURE) { |
856 | if (options.exit_on_forward_failure) | |
857 | fatal("Error: remote port forwarding failed for " | |
858 | "listen port %d", rfwd->listen_port); | |
859 | else | |
860 | logit("Warning: remote port forwarding failed for " | |
861 | "listen port %d", rfwd->listen_port); | |
862 | } | |
6c777090 | 863 | if (++remote_forward_confirms_received == options.num_remote_forwards) { |
72becb62 | 864 | debug("All remote forwarding requests processed"); |
6c777090 | 865 | if (fork_after_authentication_flag) { |
866 | fork_after_authentication_flag = 0; | |
867 | if (daemon(1, 1) < 0) | |
868 | fatal("daemon() failed: %.200s", | |
869 | strerror(errno)); | |
870 | } | |
871 | } | |
72becb62 | 872 | } |
873 | ||
396c147e | 874 | static void |
fa08c86b | 875 | ssh_init_forwarding(void) |
876 | { | |
02a024dd | 877 | int success = 0; |
fa08c86b | 878 | int i; |
02a024dd | 879 | |
fa08c86b | 880 | /* Initiate local TCP/IP port forwardings. */ |
881 | for (i = 0; i < options.num_local_forwards; i++) { | |
3867aa0a | 882 | debug("Local connections to %.200s:%d forwarded to remote " |
883 | "address %.200s:%d", | |
f8cc7664 | 884 | (options.local_forwards[i].listen_host == NULL) ? |
885 | (options.gateway_ports ? "*" : "LOCALHOST") : | |
3867aa0a | 886 | options.local_forwards[i].listen_host, |
887 | options.local_forwards[i].listen_port, | |
888 | options.local_forwards[i].connect_host, | |
889 | options.local_forwards[i].connect_port); | |
5641aefa | 890 | success += channel_setup_local_fwd_listener( |
3867aa0a | 891 | options.local_forwards[i].listen_host, |
892 | options.local_forwards[i].listen_port, | |
893 | options.local_forwards[i].connect_host, | |
894 | options.local_forwards[i].connect_port, | |
fa08c86b | 895 | options.gateway_ports); |
896 | } | |
42ea6f5e | 897 | if (i > 0 && success != i && options.exit_on_forward_failure) |
898 | fatal("Could not request local forwarding."); | |
02a024dd | 899 | if (i > 0 && success == 0) |
900 | error("Could not request local forwarding."); | |
fa08c86b | 901 | |
902 | /* Initiate remote TCP/IP port forwardings. */ | |
903 | for (i = 0; i < options.num_remote_forwards; i++) { | |
3867aa0a | 904 | debug("Remote connections from %.200s:%d forwarded to " |
905 | "local address %.200s:%d", | |
56964485 | 906 | (options.remote_forwards[i].listen_host == NULL) ? |
aa9bc1de | 907 | "LOCALHOST" : options.remote_forwards[i].listen_host, |
3867aa0a | 908 | options.remote_forwards[i].listen_port, |
909 | options.remote_forwards[i].connect_host, | |
910 | options.remote_forwards[i].connect_port); | |
42ea6f5e | 911 | if (channel_request_remote_forwarding( |
3867aa0a | 912 | options.remote_forwards[i].listen_host, |
913 | options.remote_forwards[i].listen_port, | |
914 | options.remote_forwards[i].connect_host, | |
42ea6f5e | 915 | options.remote_forwards[i].connect_port) < 0) { |
916 | if (options.exit_on_forward_failure) | |
917 | fatal("Could not request remote forwarding."); | |
918 | else | |
919 | logit("Warning: Could not request remote " | |
920 | "forwarding."); | |
921 | } | |
72becb62 | 922 | client_register_global_confirm(ssh_confirm_remote_forward, |
923 | &options.remote_forwards[i]); | |
fa08c86b | 924 | } |
79303c5a | 925 | |
926 | /* Initiate tunnel forwarding. */ | |
927 | if (options.tun_open != SSH_TUNMODE_NO) { | |
928 | if (client_request_tun_fwd(options.tun_open, | |
929 | options.tun_local, options.tun_remote) == -1) { | |
930 | if (options.exit_on_forward_failure) | |
931 | fatal("Could not request tunnel forwarding."); | |
932 | else | |
933 | error("Could not request tunnel forwarding."); | |
934 | } | |
935 | } | |
fa08c86b | 936 | } |
937 | ||
396c147e | 938 | static void |
fa08c86b | 939 | check_agent_present(void) |
940 | { | |
941 | if (options.forward_agent) { | |
7b9b0103 | 942 | /* Clear agent forwarding if we don't have an agent. */ |
8b10e20e | 943 | if (!ssh_agent_present()) |
fa08c86b | 944 | options.forward_agent = 0; |
fa08c86b | 945 | } |
946 | } | |
947 | ||
396c147e | 948 | static int |
8ce64345 | 949 | ssh_session(void) |
950 | { | |
951 | int type; | |
8ce64345 | 952 | int interactive = 0; |
953 | int have_tty = 0; | |
954 | struct winsize ws; | |
8ce64345 | 955 | char *cp; |
9bf083eb | 956 | const char *display; |
8ce64345 | 957 | |
5260325f | 958 | /* Enable compression if requested. */ |
959 | if (options.compression) { | |
e8097dc9 | 960 | debug("Requesting compression at level %d.", |
961 | options.compression_level); | |
5260325f | 962 | |
e8097dc9 | 963 | if (options.compression_level < 1 || |
964 | options.compression_level > 9) | |
965 | fatal("Compression level must be from 1 (fast) to " | |
966 | "9 (slow, best)."); | |
5260325f | 967 | |
968 | /* Send the request. */ | |
969 | packet_start(SSH_CMSG_REQUEST_COMPRESSION); | |
970 | packet_put_int(options.compression_level); | |
971 | packet_send(); | |
972 | packet_write_wait(); | |
54a5250f | 973 | type = packet_read(); |
5260325f | 974 | if (type == SSH_SMSG_SUCCESS) |
975 | packet_start_compression(options.compression_level); | |
976 | else if (type == SSH_SMSG_FAILURE) | |
bbe88b6d | 977 | logit("Warning: Remote host refused compression."); |
5260325f | 978 | else |
e8097dc9 | 979 | packet_disconnect("Protocol error waiting for " |
980 | "compression response."); | |
5260325f | 981 | } |
982 | /* Allocate a pseudo tty if appropriate. */ | |
983 | if (tty_flag) { | |
984 | debug("Requesting pty."); | |
985 | ||
986 | /* Start the packet. */ | |
987 | packet_start(SSH_CMSG_REQUEST_PTY); | |
988 | ||
989 | /* Store TERM in the packet. There is no limit on the | |
990 | length of the string. */ | |
991 | cp = getenv("TERM"); | |
992 | if (!cp) | |
993 | cp = ""; | |
449c5ba5 | 994 | packet_put_cstring(cp); |
5260325f | 995 | |
996 | /* Store window size in the packet. */ | |
997 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) | |
998 | memset(&ws, 0, sizeof(ws)); | |
148de80c | 999 | packet_put_int((u_int)ws.ws_row); |
1000 | packet_put_int((u_int)ws.ws_col); | |
1001 | packet_put_int((u_int)ws.ws_xpixel); | |
1002 | packet_put_int((u_int)ws.ws_ypixel); | |
5260325f | 1003 | |
1004 | /* Store tty modes in the packet. */ | |
30dcc918 | 1005 | tty_make_modes(fileno(stdin), NULL); |
5260325f | 1006 | |
1007 | /* Send the packet, and wait for it to leave. */ | |
1008 | packet_send(); | |
1009 | packet_write_wait(); | |
1010 | ||
1011 | /* Read response from the server. */ | |
54a5250f | 1012 | type = packet_read(); |
4fe2af09 | 1013 | if (type == SSH_SMSG_SUCCESS) { |
5260325f | 1014 | interactive = 1; |
8ce64345 | 1015 | have_tty = 1; |
4fe2af09 | 1016 | } else if (type == SSH_SMSG_FAILURE) |
e8097dc9 | 1017 | logit("Warning: Remote host failed or refused to " |
1018 | "allocate a pseudo tty."); | |
5260325f | 1019 | else |
e8097dc9 | 1020 | packet_disconnect("Protocol error waiting for pty " |
1021 | "request response."); | |
5260325f | 1022 | } |
1023 | /* Request X11 forwarding if enabled and DISPLAY is set. */ | |
9bf083eb | 1024 | display = getenv("DISPLAY"); |
1025 | if (options.forward_x11 && display != NULL) { | |
b48eeb07 | 1026 | char *proto, *data; |
0b242b12 | 1027 | /* Get reasonable local authentication information. */ |
9bf083eb | 1028 | client_x11_get_proto(display, options.xauth_location, |
1029 | options.forward_x11_trusted, &proto, &data); | |
0b242b12 | 1030 | /* Request forwarding with authentication spoofing. */ |
e8097dc9 | 1031 | debug("Requesting X11 forwarding with authentication " |
1032 | "spoofing."); | |
9bf083eb | 1033 | x11_request_forwarding_with_spoofing(0, display, proto, data); |
5260325f | 1034 | |
1035 | /* Read response from the server. */ | |
54a5250f | 1036 | type = packet_read(); |
5260325f | 1037 | if (type == SSH_SMSG_SUCCESS) { |
5260325f | 1038 | interactive = 1; |
0b242b12 | 1039 | } else if (type == SSH_SMSG_FAILURE) { |
bbe88b6d | 1040 | logit("Warning: Remote host denied X11 forwarding."); |
0b242b12 | 1041 | } else { |
e8097dc9 | 1042 | packet_disconnect("Protocol error waiting for X11 " |
1043 | "forwarding"); | |
0b242b12 | 1044 | } |
5260325f | 1045 | } |
1046 | /* Tell the packet module whether this is an interactive session. */ | |
b5c334cc | 1047 | packet_set_interactive(interactive); |
5260325f | 1048 | |
1049 | /* Request authentication agent forwarding if appropriate. */ | |
fa08c86b | 1050 | check_agent_present(); |
1051 | ||
5260325f | 1052 | if (options.forward_agent) { |
1053 | debug("Requesting authentication agent forwarding."); | |
1054 | auth_request_forwarding(); | |
1055 | ||
1056 | /* Read response from the server. */ | |
54a5250f | 1057 | type = packet_read(); |
95500969 | 1058 | packet_check_eom(); |
5260325f | 1059 | if (type != SSH_SMSG_SUCCESS) |
bbe88b6d | 1060 | logit("Warning: Remote host denied authentication agent forwarding."); |
5260325f | 1061 | } |
8efc0c15 | 1062 | |
fa08c86b | 1063 | /* Initiate port forwardings. */ |
1064 | ssh_init_forwarding(); | |
5260325f | 1065 | |
c80e7e5d | 1066 | /* Execute a local command */ |
1067 | if (options.local_command != NULL && | |
1068 | options.permit_local_command) | |
1069 | ssh_local_cmd(options.local_command); | |
1070 | ||
6c777090 | 1071 | /* |
1072 | * If requested and we are not interested in replies to remote | |
1073 | * forwarding requests, then let ssh continue in the background. | |
1074 | */ | |
1075 | if (fork_after_authentication_flag && | |
1076 | (!options.exit_on_forward_failure || | |
1077 | options.num_remote_forwards == 0)) { | |
1078 | fork_after_authentication_flag = 0; | |
aa3378df | 1079 | if (daemon(1, 1) < 0) |
1080 | fatal("daemon() failed: %.200s", strerror(errno)); | |
6c777090 | 1081 | } |
aa3378df | 1082 | |
1083 | /* | |
1084 | * If a command was specified on the command line, execute the | |
1085 | * command now. Otherwise request the server to start a shell. | |
1086 | */ | |
5260325f | 1087 | if (buffer_len(&command) > 0) { |
1088 | int len = buffer_len(&command); | |
1089 | if (len > 900) | |
1090 | len = 900; | |
e8097dc9 | 1091 | debug("Sending command: %.*s", len, |
1092 | (u_char *)buffer_ptr(&command)); | |
5260325f | 1093 | packet_start(SSH_CMSG_EXEC_CMD); |
1094 | packet_put_string(buffer_ptr(&command), buffer_len(&command)); | |
1095 | packet_send(); | |
1096 | packet_write_wait(); | |
1097 | } else { | |
1098 | debug("Requesting shell."); | |
1099 | packet_start(SSH_CMSG_EXEC_SHELL); | |
1100 | packet_send(); | |
1101 | packet_write_wait(); | |
1102 | } | |
1103 | ||
1104 | /* Enter the interactive session. */ | |
4bf9c10e | 1105 | return client_loop(have_tty, tty_flag ? |
1106 | options.escape_char : SSH_ESCAPECHAR_NONE, 0); | |
8ce64345 | 1107 | } |
5260325f | 1108 | |
5e96b616 | 1109 | /* request pty/x11/agent/tcpfwd/shell for channel */ |
1110 | static void | |
1111 | ssh_session2_setup(int id, void *arg) | |
1112 | { | |
1786be35 | 1113 | extern char **environ; |
9bf083eb | 1114 | const char *display; |
5e96b616 | 1115 | int interactive = tty_flag; |
9bf083eb | 1116 | |
56964485 | 1117 | display = getenv("DISPLAY"); |
9bf083eb | 1118 | if (options.forward_x11 && display != NULL) { |
b48eeb07 | 1119 | char *proto, *data; |
0b242b12 | 1120 | /* Get reasonable local authentication information. */ |
9bf083eb | 1121 | client_x11_get_proto(display, options.xauth_location, |
1122 | options.forward_x11_trusted, &proto, &data); | |
0b242b12 | 1123 | /* Request forwarding with authentication spoofing. */ |
e8097dc9 | 1124 | debug("Requesting X11 forwarding with authentication " |
1125 | "spoofing."); | |
9bf083eb | 1126 | x11_request_forwarding_with_spoofing(id, display, proto, data); |
b5c334cc | 1127 | interactive = 1; |
0b242b12 | 1128 | /* XXX wait for reply */ |
1129 | } | |
1130 | ||
fa08c86b | 1131 | check_agent_present(); |
1132 | if (options.forward_agent) { | |
1133 | debug("Requesting authentication agent forwarding."); | |
1134 | channel_request_start(id, "auth-agent-req@openssh.com", 0); | |
1135 | packet_send(); | |
1136 | } | |
1137 | ||
5e96b616 | 1138 | client_session2_setup(id, tty_flag, subsystem_flag, getenv("TERM"), |
95d3c124 | 1139 | NULL, fileno(stdin), &command, environ); |
1f3bf5aa | 1140 | |
b5c334cc | 1141 | packet_set_interactive(interactive); |
8ce64345 | 1142 | } |
1143 | ||
bcdb96c2 | 1144 | /* open new channel for a session */ |
396c147e | 1145 | static int |
bcdb96c2 | 1146 | ssh_session2_open(void) |
8ce64345 | 1147 | { |
719fc62f | 1148 | Channel *c; |
1149 | int window, packetmax, in, out, err; | |
2e73a022 | 1150 | |
14a9a859 | 1151 | if (stdin_null_flag) { |
5ca51e19 | 1152 | in = open(_PATH_DEVNULL, O_RDONLY); |
14a9a859 | 1153 | } else { |
1154 | in = dup(STDIN_FILENO); | |
1155 | } | |
2e73a022 | 1156 | out = dup(STDOUT_FILENO); |
1157 | err = dup(STDERR_FILENO); | |
8ce64345 | 1158 | |
1159 | if (in < 0 || out < 0 || err < 0) | |
14a9a859 | 1160 | fatal("dup() in/out/err failed"); |
8ce64345 | 1161 | |
a22aff1f | 1162 | /* enable nonblocking unless tty */ |
1163 | if (!isatty(in)) | |
1164 | set_nonblock(in); | |
1165 | if (!isatty(out)) | |
1166 | set_nonblock(out); | |
1167 | if (!isatty(err)) | |
1168 | set_nonblock(err); | |
1169 | ||
bcbf86ec | 1170 | window = CHAN_SES_WINDOW_DEFAULT; |
1171 | packetmax = CHAN_SES_PACKET_DEFAULT; | |
ea9700ba | 1172 | if (tty_flag) { |
1173 | window >>= 1; | |
1174 | packetmax >>= 1; | |
8ce64345 | 1175 | } |
719fc62f | 1176 | c = channel_new( |
8ce64345 | 1177 | "session", SSH_CHANNEL_OPENING, in, out, err, |
bcbf86ec | 1178 | window, packetmax, CHAN_EXTENDED_WRITE, |
0d942eff | 1179 | "client-session", /*nonblock*/0); |
8ce64345 | 1180 | |
bcdb96c2 | 1181 | debug3("ssh_session2_open: channel_new: %d", c->self); |
eb0dd41f | 1182 | |
36e1f6a1 | 1183 | channel_send_open(c->self); |
bcdb96c2 | 1184 | if (!no_shell_flag) |
3593bdc0 | 1185 | channel_register_open_confirm(c->self, |
1186 | ssh_session2_setup, NULL); | |
5260325f | 1187 | |
719fc62f | 1188 | return c->self; |
eb0dd41f | 1189 | } |
1190 | ||
396c147e | 1191 | static int |
eb0dd41f | 1192 | ssh_session2(void) |
1193 | { | |
bcdb96c2 | 1194 | int id = -1; |
eb0dd41f | 1195 | |
1196 | /* XXX should be pre-session */ | |
1197 | ssh_init_forwarding(); | |
1198 | ||
bcdb96c2 | 1199 | if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN)) |
1200 | id = ssh_session2_open(); | |
eb0dd41f | 1201 | |
3f0444ca | 1202 | /* If we don't expect to open a new session, then disallow it */ |
72bd2fca | 1203 | if (options.control_master == SSHCTL_MASTER_NO && |
1204 | (datafellows & SSH_NEW_OPENSSH)) { | |
3f0444ca | 1205 | debug("Requesting no-more-sessions@openssh.com"); |
1206 | packet_start(SSH2_MSG_GLOBAL_REQUEST); | |
1207 | packet_put_cstring("no-more-sessions@openssh.com"); | |
1208 | packet_put_char(0); | |
1209 | packet_send(); | |
1210 | } | |
1211 | ||
d20f3c9e | 1212 | /* Execute a local command */ |
1213 | if (options.local_command != NULL && | |
1214 | options.permit_local_command) | |
1215 | ssh_local_cmd(options.local_command); | |
1216 | ||
79303c5a | 1217 | /* Start listening for multiplex clients */ |
3bcced4c | 1218 | muxserver_listen(); |
79303c5a | 1219 | |
eb0dd41f | 1220 | /* If requested, let ssh continue in the background. */ |
6c777090 | 1221 | if (fork_after_authentication_flag) { |
1222 | fork_after_authentication_flag = 0; | |
eb0dd41f | 1223 | if (daemon(1, 1) < 0) |
1224 | fatal("daemon() failed: %.200s", strerror(errno)); | |
6c777090 | 1225 | } |
eb0dd41f | 1226 | |
1cb94277 | 1227 | if (options.use_roaming) |
1228 | request_roaming(); | |
1229 | ||
4bf9c10e | 1230 | return client_loop(tty_flag, tty_flag ? |
1231 | options.escape_char : SSH_ESCAPECHAR_NONE, id); | |
8efc0c15 | 1232 | } |
fa08c86b | 1233 | |
396c147e | 1234 | static void |
fee56204 | 1235 | load_public_identity_files(void) |
1236 | { | |
8cffe22a | 1237 | char *filename, *cp, thishost[NI_MAXHOST]; |
a7082e17 | 1238 | char *pwdir = NULL, *pwname = NULL; |
2e23cde0 | 1239 | int i = 0; |
0659cace | 1240 | Key *public; |
8cffe22a | 1241 | struct passwd *pw; |
383546c4 | 1242 | #ifdef SMARTCARD |
0659cace | 1243 | Key **keys; |
1244 | ||
9ff6f66f | 1245 | if (options.smartcard_device != NULL && |
0659cace | 1246 | options.num_identity_files < SSH_MAX_IDENTITY_FILES && |
d4f40d92 | 1247 | (keys = sc_get_keys(options.smartcard_device, NULL)) != NULL) { |
0659cace | 1248 | int count = 0; |
1249 | for (i = 0; keys[i] != NULL; i++) { | |
1250 | count++; | |
e8097dc9 | 1251 | memmove(&options.identity_files[1], |
1252 | &options.identity_files[0], | |
0659cace | 1253 | sizeof(char *) * (SSH_MAX_IDENTITY_FILES - 1)); |
e8097dc9 | 1254 | memmove(&options.identity_keys[1], |
1255 | &options.identity_keys[0], | |
0659cace | 1256 | sizeof(Key *) * (SSH_MAX_IDENTITY_FILES - 1)); |
1257 | options.num_identity_files++; | |
1258 | options.identity_keys[0] = keys[i]; | |
244e796f | 1259 | options.identity_files[0] = sc_get_key_label(keys[i]); |
0659cace | 1260 | } |
1c2deed1 | 1261 | if (options.num_identity_files > SSH_MAX_IDENTITY_FILES) |
1262 | options.num_identity_files = SSH_MAX_IDENTITY_FILES; | |
0659cace | 1263 | i = count; |
1264 | xfree(keys); | |
383546c4 | 1265 | } |
3e984472 | 1266 | #endif /* SMARTCARD */ |
8cffe22a | 1267 | if ((pw = getpwuid(original_real_uid)) == NULL) |
1268 | fatal("load_public_identity_files: getpwuid failed"); | |
42f4b33f | 1269 | pwname = xstrdup(pw->pw_name); |
1270 | pwdir = xstrdup(pw->pw_dir); | |
8cffe22a | 1271 | if (gethostname(thishost, sizeof(thishost)) == -1) |
1272 | fatal("load_public_identity_files: gethostname: %s", | |
1273 | strerror(errno)); | |
2e23cde0 | 1274 | for (; i < options.num_identity_files; i++) { |
8cffe22a | 1275 | cp = tilde_expand_filename(options.identity_files[i], |
2e23cde0 | 1276 | original_real_uid); |
a7082e17 | 1277 | filename = percent_expand(cp, "d", pwdir, |
1278 | "u", pwname, "l", thishost, "h", host, | |
8cffe22a | 1279 | "r", options.user, (char *)NULL); |
1280 | xfree(cp); | |
2e23cde0 | 1281 | public = key_load_public(filename, NULL); |
1282 | debug("identity file %s type %d", filename, | |
1283 | public ? public->type : -1); | |
1284 | xfree(options.identity_files[i]); | |
1285 | options.identity_files[i] = filename; | |
1286 | options.identity_keys[i] = public; | |
1287 | } | |
a7082e17 | 1288 | bzero(pwname, strlen(pwname)); |
42f4b33f | 1289 | xfree(pwname); |
a7082e17 | 1290 | bzero(pwdir, strlen(pwdir)); |
42f4b33f | 1291 | xfree(pwdir); |
fee56204 | 1292 | } |