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8efc0c15 | 1 | /* |
5260325f | 2 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
3 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
4 | * All rights reserved | |
5260325f | 5 | * 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 | * | |
bcbf86ec | 9 | * 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. | |
d73a67d7 | 16 | * Copyright (c) 2000, 2001, 2002, 2003 Markus Friedl. All rights reserved. |
bcbf86ec | 17 | * |
18 | * Modified to work with SSL by Niels Provos <provos@citi.umich.edu> | |
19 | * in Canada (German citizen). | |
20 | * | |
21 | * Redistribution and use in source and binary forms, with or without | |
22 | * modification, are permitted provided that the following conditions | |
23 | * are met: | |
24 | * 1. Redistributions of source code must retain the above copyright | |
25 | * notice, this list of conditions and the following disclaimer. | |
26 | * 2. Redistributions in binary form must reproduce the above copyright | |
27 | * notice, this list of conditions and the following disclaimer in the | |
28 | * documentation and/or other materials provided with the distribution. | |
29 | * | |
30 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
31 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
32 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
33 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
34 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
35 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
36 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
37 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
38 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
39 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
5260325f | 40 | */ |
8efc0c15 | 41 | |
42 | #include "includes.h" | |
876faccd | 43 | RCSID("$OpenBSD: ssh.c,v 1.259 2006/02/08 14:31:30 stevesk Exp $"); |
44 | ||
45 | #include <sys/resource.h> | |
a75f5360 | 46 | |
47 | #include <paths.h> | |
8efc0c15 | 48 | |
a306f2dd | 49 | #include <openssl/evp.h> |
fa08c86b | 50 | #include <openssl/err.h> |
a306f2dd | 51 | |
8efc0c15 | 52 | #include "ssh.h" |
42f11eb2 | 53 | #include "ssh1.h" |
54 | #include "ssh2.h" | |
55 | #include "compat.h" | |
56 | #include "cipher.h" | |
57 | #include "xmalloc.h" | |
8efc0c15 | 58 | #include "packet.h" |
59 | #include "buffer.h" | |
5e96b616 | 60 | #include "bufaux.h" |
a5efa1bb | 61 | #include "channels.h" |
a306f2dd | 62 | #include "key.h" |
4c8722d9 | 63 | #include "authfd.h" |
a306f2dd | 64 | #include "authfile.h" |
42f11eb2 | 65 | #include "pathnames.h" |
5e96b616 | 66 | #include "dispatch.h" |
b5c334cc | 67 | #include "clientloop.h" |
42f11eb2 | 68 | #include "log.h" |
69 | #include "readconf.h" | |
70 | #include "sshconnect.h" | |
42f11eb2 | 71 | #include "misc.h" |
b2552997 | 72 | #include "kex.h" |
73 | #include "mac.h" | |
07d80252 | 74 | #include "sshpty.h" |
61a2c1da | 75 | #include "match.h" |
5e96b616 | 76 | #include "msg.h" |
77 | #include "monitor_fdpass.h" | |
6213295d | 78 | #include "uidswap.h" |
8efc0c15 | 79 | |
383546c4 | 80 | #ifdef SMARTCARD |
383546c4 | 81 | #include "scard.h" |
dd2495cb | 82 | #endif |
383546c4 | 83 | |
f601d847 | 84 | extern char *__progname; |
f601d847 | 85 | |
5260325f | 86 | /* Flag indicating whether debug mode is on. This can be set on the command line. */ |
8efc0c15 | 87 | int debug_flag = 0; |
88 | ||
a8be9f80 | 89 | /* Flag indicating whether a tty should be allocated */ |
8efc0c15 | 90 | int tty_flag = 0; |
8abcdba4 | 91 | int no_tty_flag = 0; |
92 | int force_tty_flag = 0; | |
8efc0c15 | 93 | |
8ce64345 | 94 | /* don't exec a shell */ |
95 | int no_shell_flag = 0; | |
8ce64345 | 96 | |
aa3378df | 97 | /* |
98 | * Flag indicating that nothing should be read from stdin. This can be set | |
99 | * on the command line. | |
100 | */ | |
8efc0c15 | 101 | int stdin_null_flag = 0; |
102 | ||
aa3378df | 103 | /* |
104 | * Flag indicating that ssh should fork after authentication. This is useful | |
c242fc96 | 105 | * so that the passphrase can be entered manually, and then ssh goes to the |
aa3378df | 106 | * background. |
107 | */ | |
8efc0c15 | 108 | int fork_after_authentication_flag = 0; |
109 | ||
aa3378df | 110 | /* |
111 | * General data structure for command line options and options configurable | |
112 | * in configuration files. See readconf.h. | |
113 | */ | |
8efc0c15 | 114 | Options options; |
115 | ||
e591b98a | 116 | /* optional user configfile */ |
117 | char *config = NULL; | |
118 | ||
aa3378df | 119 | /* |
120 | * Name of the host we are connecting to. This is the name given on the | |
121 | * command line, or the HostName specified for the user-supplied name in a | |
122 | * configuration file. | |
123 | */ | |
8efc0c15 | 124 | char *host; |
125 | ||
126 | /* socket address the host resolves to */ | |
48e671d5 | 127 | struct sockaddr_storage hostaddr; |
8efc0c15 | 128 | |
8002af61 | 129 | /* Private host keys. */ |
39c00dc2 | 130 | Sensitive sensitive_data; |
8efc0c15 | 131 | |
132 | /* Original real UID. */ | |
133 | uid_t original_real_uid; | |
3fb156df | 134 | uid_t original_effective_uid; |
8efc0c15 | 135 | |
8ce64345 | 136 | /* command to be executed */ |
137 | Buffer command; | |
138 | ||
ae810de7 | 139 | /* Should we execute a command or invoke a subsystem? */ |
140 | int subsystem_flag = 0; | |
141 | ||
e0ae8728 | 142 | /* # of replies received for global requests */ |
143 | static int client_global_request_id = 0; | |
144 | ||
6939bbd4 | 145 | /* pid of proxycommand child process */ |
146 | pid_t proxy_command_pid = 0; | |
147 | ||
5e96b616 | 148 | /* fd to control socket */ |
149 | int control_fd = -1; | |
150 | ||
f8c6db83 | 151 | /* Multiplexing control command */ |
19186c3d | 152 | static u_int mux_command = 0; |
f8c6db83 | 153 | |
5e96b616 | 154 | /* Only used in control client mode */ |
155 | volatile sig_atomic_t control_client_terminate = 0; | |
156 | u_int control_server_pid = 0; | |
157 | ||
8efc0c15 | 158 | /* Prints a help message to the user. This function never returns. */ |
159 | ||
396c147e | 160 | static void |
5ca51e19 | 161 | usage(void) |
8efc0c15 | 162 | { |
182ccbba | 163 | fprintf(stderr, |
aeefce7a | 164 | "usage: ssh [-1246AaCfgkMNnqsTtVvXxY] [-b bind_address] [-c cipher_spec]\n" |
80e29ee6 | 165 | " [-D [bind_address:]port] [-e escape_char] [-F configfile]\n" |
8cf98c65 | 166 | " [-i identity_file] [-L [bind_address:]port:host:hostport]\n" |
3867aa0a | 167 | " [-l login_name] [-m mac_spec] [-O ctl_cmd] [-o option] [-p port]\n" |
8cf98c65 | 168 | " [-R [bind_address:]port:host:hostport] [-S ctl_path]\n" |
d20f3c9e | 169 | " [-w tunnel:tunnel] [user@]hostname [command]\n" |
182ccbba | 170 | ); |
3aa43b24 | 171 | exit(255); |
8efc0c15 | 172 | } |
173 | ||
396c147e | 174 | static int ssh_session(void); |
175 | static int ssh_session2(void); | |
176 | static void load_public_identity_files(void); | |
5e96b616 | 177 | static void control_client(const char *path); |
8ce64345 | 178 | |
5260325f | 179 | /* |
180 | * Main program for the ssh client. | |
181 | */ | |
8efc0c15 | 182 | int |
183 | main(int ac, char **av) | |
184 | { | |
b34bec32 | 185 | int i, opt, exit_status; |
1aafd17a | 186 | char *p, *cp, *line, buf[256]; |
5260325f | 187 | struct stat st; |
3b1a83df | 188 | struct passwd *pw; |
8ce64345 | 189 | int dummy; |
57dade33 | 190 | extern int optind, optreset; |
1812a662 | 191 | extern char *optarg; |
c1cbe68a | 192 | struct servent *sp; |
3867aa0a | 193 | Forward fwd; |
5260325f | 194 | |
fd6168c1 | 195 | /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ |
196 | sanitise_stdfd(); | |
197 | ||
fda04d7d | 198 | __progname = ssh_get_progname(av[0]); |
264dce47 | 199 | init_rng(); |
200 | ||
aa3378df | 201 | /* |
202 | * Save the original real uid. It will be needed later (uid-swapping | |
203 | * may clobber the real uid). | |
204 | */ | |
5260325f | 205 | original_real_uid = getuid(); |
206 | original_effective_uid = geteuid(); | |
aff51935 | 207 | |
9f324470 | 208 | /* |
209 | * Use uid-swapping to give up root privileges for the duration of | |
210 | * option processing. We will re-instantiate the rights when we are | |
211 | * ready to create the privileged port, and will permanently drop | |
212 | * them when the port has been created (actually, when the connection | |
213 | * has been made, as we may need to create the port several times). | |
214 | */ | |
215 | PRIV_END; | |
5260325f | 216 | |
7322ef0e | 217 | #ifdef HAVE_SETRLIMIT |
5260325f | 218 | /* If we are installed setuid root be careful to not drop core. */ |
219 | if (original_real_uid != original_effective_uid) { | |
220 | struct rlimit rlim; | |
221 | rlim.rlim_cur = rlim.rlim_max = 0; | |
222 | if (setrlimit(RLIMIT_CORE, &rlim) < 0) | |
223 | fatal("setrlimit failed: %.100s", strerror(errno)); | |
8efc0c15 | 224 | } |
3c62e7eb | 225 | #endif |
63bd8c36 | 226 | /* Get user data. */ |
227 | pw = getpwuid(original_real_uid); | |
228 | if (!pw) { | |
bbe88b6d | 229 | logit("You don't exist, go away!"); |
3aa43b24 | 230 | exit(255); |
63bd8c36 | 231 | } |
232 | /* Take a copy of the returned structure. */ | |
233 | pw = pwcopy(pw); | |
234 | ||
aa3378df | 235 | /* |
236 | * Set our umask to something reasonable, as some files are created | |
237 | * with the default umask. This will make them world-readable but | |
238 | * writable only by the owner, which is ok for all files for which we | |
239 | * don't set the modes explicitly. | |
240 | */ | |
5260325f | 241 | umask(022); |
242 | ||
5260325f | 243 | /* Initialize option structure to indicate that no values have been set. */ |
244 | initialize_options(&options); | |
245 | ||
246 | /* Parse command-line arguments. */ | |
247 | host = NULL; | |
248 | ||
f5a1a01a | 249 | again: |
250 | while ((opt = getopt(ac, av, | |
d20f3c9e | 251 | "1246ab:c:e:fgi:kl:m:no:p:qstvxACD:F:I:L:MNO:PR:S:TVw:XY")) != -1) { |
5260325f | 252 | switch (opt) { |
1f3bf5aa | 253 | case '1': |
254 | options.protocol = SSH_PROTO_1; | |
255 | break; | |
6ae2364d | 256 | case '2': |
257 | options.protocol = SSH_PROTO_2; | |
258 | break; | |
48e671d5 | 259 | case '4': |
1572b90f | 260 | options.address_family = AF_INET; |
48e671d5 | 261 | break; |
48e671d5 | 262 | case '6': |
1572b90f | 263 | options.address_family = AF_INET6; |
48e671d5 | 264 | break; |
5260325f | 265 | case 'n': |
266 | stdin_null_flag = 1; | |
267 | break; | |
5260325f | 268 | case 'f': |
269 | fork_after_authentication_flag = 1; | |
270 | stdin_null_flag = 1; | |
271 | break; | |
5260325f | 272 | case 'x': |
273 | options.forward_x11 = 0; | |
274 | break; | |
5260325f | 275 | case 'X': |
276 | options.forward_x11 = 1; | |
277 | break; | |
d73a67d7 | 278 | case 'Y': |
279 | options.forward_x11 = 1; | |
280 | options.forward_x11_trusted = 1; | |
281 | break; | |
5260325f | 282 | case 'g': |
283 | options.gateway_ports = 1; | |
284 | break; | |
f8c6db83 | 285 | case 'O': |
286 | if (strcmp(optarg, "check") == 0) | |
287 | mux_command = SSHMUX_COMMAND_ALIVE_CHECK; | |
288 | else if (strcmp(optarg, "exit") == 0) | |
289 | mux_command = SSHMUX_COMMAND_TERMINATE; | |
290 | else | |
291 | fatal("Invalid multiplex command."); | |
292 | break; | |
e59404d1 | 293 | case 'P': /* deprecated */ |
5260325f | 294 | options.use_privileged_port = 0; |
295 | break; | |
5260325f | 296 | case 'a': |
297 | options.forward_agent = 0; | |
298 | break; | |
71276795 | 299 | case 'A': |
300 | options.forward_agent = 1; | |
301 | break; | |
5260325f | 302 | case 'k': |
f7926e97 | 303 | options.gss_deleg_creds = 0; |
5260325f | 304 | break; |
5260325f | 305 | case 'i': |
306 | if (stat(optarg, &st) < 0) { | |
f5a1a01a | 307 | fprintf(stderr, "Warning: Identity file %s " |
ec304d66 | 308 | "not accessible: %s.\n", optarg, |
309 | strerror(errno)); | |
5260325f | 310 | break; |
311 | } | |
f5a1a01a | 312 | if (options.num_identity_files >= |
313 | SSH_MAX_IDENTITY_FILES) | |
314 | fatal("Too many identity files specified " | |
315 | "(max %d)", SSH_MAX_IDENTITY_FILES); | |
316 | options.identity_files[options.num_identity_files++] = | |
317 | xstrdup(optarg); | |
5260325f | 318 | break; |
383546c4 | 319 | case 'I': |
320 | #ifdef SMARTCARD | |
9ff6f66f | 321 | options.smartcard_device = xstrdup(optarg); |
dd2495cb | 322 | #else |
383546c4 | 323 | fprintf(stderr, "no support for smartcards.\n"); |
dd2495cb | 324 | #endif |
383546c4 | 325 | break; |
5260325f | 326 | case 't': |
8abcdba4 | 327 | if (tty_flag) |
328 | force_tty_flag = 1; | |
5260325f | 329 | tty_flag = 1; |
330 | break; | |
5260325f | 331 | case 'v': |
e053cd2c | 332 | if (debug_flag == 0) { |
bcbf86ec | 333 | debug_flag = 1; |
334 | options.log_level = SYSLOG_LEVEL_DEBUG1; | |
e053cd2c | 335 | } else { |
336 | if (options.log_level < SYSLOG_LEVEL_DEBUG3) | |
337 | options.log_level++; | |
bcbf86ec | 338 | break; |
e053cd2c | 339 | } |
59d4718a | 340 | /* FALLTHROUGH */ |
5260325f | 341 | case 'V': |
85ac7a84 | 342 | fprintf(stderr, "%s, %s\n", |
4526e8c2 | 343 | SSH_RELEASE, SSLeay_version(SSLEAY_VERSION)); |
5260325f | 344 | if (opt == 'V') |
345 | exit(0); | |
5260325f | 346 | break; |
d20f3c9e | 347 | case 'w': |
a4f24bf8 | 348 | if (options.tun_open == -1) |
349 | options.tun_open = SSH_TUNMODE_DEFAULT; | |
d20f3c9e | 350 | options.tun_local = a2tun(optarg, &options.tun_remote); |
a4f24bf8 | 351 | if (options.tun_local == SSH_TUNID_ERR) { |
d20f3c9e | 352 | fprintf(stderr, "Bad tun device '%s'\n", optarg); |
3aa43b24 | 353 | exit(255); |
d20f3c9e | 354 | } |
355 | break; | |
5260325f | 356 | case 'q': |
357 | options.log_level = SYSLOG_LEVEL_QUIET; | |
358 | break; | |
5260325f | 359 | case 'e': |
360 | if (optarg[0] == '^' && optarg[2] == 0 && | |
f5a1a01a | 361 | (u_char) optarg[1] >= 64 && |
362 | (u_char) optarg[1] < 128) | |
1e3b8b07 | 363 | options.escape_char = (u_char) optarg[1] & 31; |
5260325f | 364 | else if (strlen(optarg) == 1) |
1e3b8b07 | 365 | options.escape_char = (u_char) optarg[0]; |
5260325f | 366 | else if (strcmp(optarg, "none") == 0) |
4bf9c10e | 367 | options.escape_char = SSH_ESCAPECHAR_NONE; |
5260325f | 368 | else { |
f5a1a01a | 369 | fprintf(stderr, "Bad escape character '%s'.\n", |
370 | optarg); | |
3aa43b24 | 371 | exit(255); |
5260325f | 372 | } |
373 | break; | |
5260325f | 374 | case 'c': |
a306f2dd | 375 | if (ciphers_valid(optarg)) { |
376 | /* SSH2 only */ | |
377 | options.ciphers = xstrdup(optarg); | |
d77347cc | 378 | options.cipher = SSH_CIPHER_INVALID; |
a306f2dd | 379 | } else { |
380 | /* SSH1 only */ | |
c523303b | 381 | options.cipher = cipher_number(optarg); |
382 | if (options.cipher == -1) { | |
f5a1a01a | 383 | fprintf(stderr, |
384 | "Unknown cipher type '%s'\n", | |
385 | optarg); | |
3aa43b24 | 386 | exit(255); |
a306f2dd | 387 | } |
f5a1a01a | 388 | if (options.cipher == SSH_CIPHER_3DES) |
c523303b | 389 | options.ciphers = "3des-cbc"; |
f5a1a01a | 390 | else if (options.cipher == SSH_CIPHER_BLOWFISH) |
c523303b | 391 | options.ciphers = "blowfish-cbc"; |
f5a1a01a | 392 | else |
c523303b | 393 | options.ciphers = (char *)-1; |
5260325f | 394 | } |
395 | break; | |
b2552997 | 396 | case 'm': |
397 | if (mac_valid(optarg)) | |
398 | options.macs = xstrdup(optarg); | |
399 | else { | |
f5a1a01a | 400 | fprintf(stderr, "Unknown mac type '%s'\n", |
401 | optarg); | |
3aa43b24 | 402 | exit(255); |
b2552997 | 403 | } |
404 | break; | |
5e96b616 | 405 | case 'M': |
9dfd96d6 | 406 | if (options.control_master == SSHCTL_MASTER_YES) |
407 | options.control_master = SSHCTL_MASTER_ASK; | |
408 | else | |
409 | options.control_master = SSHCTL_MASTER_YES; | |
5e96b616 | 410 | break; |
5260325f | 411 | case 'p': |
2d2a2c65 | 412 | options.port = a2port(optarg); |
413 | if (options.port == 0) { | |
6031af8d | 414 | fprintf(stderr, "Bad port '%s'\n", optarg); |
3aa43b24 | 415 | exit(255); |
6031af8d | 416 | } |
5260325f | 417 | break; |
5260325f | 418 | case 'l': |
419 | options.user = optarg; | |
420 | break; | |
d2e3df16 | 421 | |
422 | case 'L': | |
3867aa0a | 423 | if (parse_forward(&fwd, optarg)) |
424 | add_local_forward(&options, &fwd); | |
425 | else { | |
f5a1a01a | 426 | fprintf(stderr, |
3867aa0a | 427 | "Bad local forwarding specification '%s'\n", |
f5a1a01a | 428 | optarg); |
3aa43b24 | 429 | exit(255); |
5260325f | 430 | } |
3867aa0a | 431 | break; |
432 | ||
433 | case 'R': | |
434 | if (parse_forward(&fwd, optarg)) { | |
435 | add_remote_forward(&options, &fwd); | |
436 | } else { | |
f5a1a01a | 437 | fprintf(stderr, |
3867aa0a | 438 | "Bad remote forwarding specification " |
439 | "'%s'\n", optarg); | |
3aa43b24 | 440 | exit(255); |
5260325f | 441 | } |
5260325f | 442 | break; |
0490e609 | 443 | |
444 | case 'D': | |
3867aa0a | 445 | cp = p = xstrdup(optarg); |
446 | memset(&fwd, '\0', sizeof(fwd)); | |
447 | fwd.connect_host = "socks"; | |
448 | if ((fwd.listen_host = hpdelim(&cp)) == NULL) { | |
449 | fprintf(stderr, "Bad dynamic forwarding " | |
450 | "specification '%.100s'\n", optarg); | |
3aa43b24 | 451 | exit(255); |
3867aa0a | 452 | } |
453 | if (cp != NULL) { | |
454 | fwd.listen_port = a2port(cp); | |
455 | fwd.listen_host = cleanhostname(fwd.listen_host); | |
456 | } else { | |
457 | fwd.listen_port = a2port(fwd.listen_host); | |
7c840747 | 458 | fwd.listen_host = NULL; |
3867aa0a | 459 | } |
460 | ||
461 | if (fwd.listen_port == 0) { | |
f5a1a01a | 462 | fprintf(stderr, "Bad dynamic port '%s'\n", |
463 | optarg); | |
3aa43b24 | 464 | exit(255); |
6031af8d | 465 | } |
3867aa0a | 466 | add_local_forward(&options, &fwd); |
467 | xfree(p); | |
0490e609 | 468 | break; |
469 | ||
5260325f | 470 | case 'C': |
471 | options.compression = 1; | |
472 | break; | |
8ce64345 | 473 | case 'N': |
474 | no_shell_flag = 1; | |
475 | no_tty_flag = 1; | |
476 | break; | |
8ce64345 | 477 | case 'T': |
478 | no_tty_flag = 1; | |
479 | break; | |
5260325f | 480 | case 'o': |
481 | dummy = 1; | |
1aafd17a | 482 | line = xstrdup(optarg); |
f5a1a01a | 483 | if (process_config_line(&options, host ? host : "", |
1aafd17a | 484 | line, "command-line", 0, &dummy) != 0) |
3aa43b24 | 485 | exit(255); |
1aafd17a | 486 | xfree(line); |
5260325f | 487 | break; |
ae810de7 | 488 | case 's': |
489 | subsystem_flag = 1; | |
490 | break; | |
5e96b616 | 491 | case 'S': |
492 | if (options.control_path != NULL) | |
493 | free(options.control_path); | |
494 | options.control_path = xstrdup(optarg); | |
5e96b616 | 495 | break; |
3435f5a6 | 496 | case 'b': |
497 | options.bind_address = optarg; | |
498 | break; | |
e591b98a | 499 | case 'F': |
500 | config = optarg; | |
501 | break; | |
5260325f | 502 | default: |
503 | usage(); | |
504 | } | |
505 | } | |
506 | ||
f5a1a01a | 507 | ac -= optind; |
508 | av += optind; | |
509 | ||
510 | if (ac > 0 && !host && **av != '-') { | |
15748b4d | 511 | if (strrchr(*av, '@')) { |
f5a1a01a | 512 | p = xstrdup(*av); |
15748b4d | 513 | cp = strrchr(p, '@'); |
f5a1a01a | 514 | if (cp == NULL || cp == p) |
515 | usage(); | |
516 | options.user = p; | |
517 | *cp = '\0'; | |
518 | host = ++cp; | |
519 | } else | |
520 | host = *av; | |
978ebf99 | 521 | if (ac > 1) { |
522 | optind = optreset = 1; | |
f5a1a01a | 523 | goto again; |
524 | } | |
978ebf99 | 525 | ac--, av++; |
f5a1a01a | 526 | } |
527 | ||
5260325f | 528 | /* Check that we got a host name. */ |
529 | if (!host) | |
8efc0c15 | 530 | usage(); |
5260325f | 531 | |
22d89d24 | 532 | SSLeay_add_all_algorithms(); |
fa08c86b | 533 | ERR_load_crypto_strings(); |
22d89d24 | 534 | |
5260325f | 535 | /* Initialize the command to execute on remote host. */ |
536 | buffer_init(&command); | |
537 | ||
aa3378df | 538 | /* |
539 | * Save the command to execute on the remote host in a buffer. There | |
540 | * is no limit on the length of the command, except by the maximum | |
541 | * packet size. Also sets the tty flag if there is no command. | |
542 | */ | |
f5a1a01a | 543 | if (!ac) { |
5260325f | 544 | /* No command specified - execute shell on a tty. */ |
545 | tty_flag = 1; | |
ae810de7 | 546 | if (subsystem_flag) { |
f5a1a01a | 547 | fprintf(stderr, |
548 | "You must specify a subsystem to invoke.\n"); | |
ae810de7 | 549 | usage(); |
550 | } | |
5260325f | 551 | } else { |
f5a1a01a | 552 | /* A command has been specified. Store it into the buffer. */ |
553 | for (i = 0; i < ac; i++) { | |
554 | if (i) | |
5260325f | 555 | buffer_append(&command, " ", 1); |
556 | buffer_append(&command, av[i], strlen(av[i])); | |
557 | } | |
8efc0c15 | 558 | } |
5260325f | 559 | |
560 | /* Cannot fork to background if no command. */ | |
14a9a859 | 561 | if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag) |
5260325f | 562 | fatal("Cannot fork into background without a command to execute."); |
563 | ||
564 | /* Allocate a tty by default if no command specified. */ | |
565 | if (buffer_len(&command) == 0) | |
566 | tty_flag = 1; | |
567 | ||
343288b8 | 568 | /* Force no tty */ |
0b6fbf03 | 569 | if (no_tty_flag) |
570 | tty_flag = 0; | |
5260325f | 571 | /* Do not allocate a tty if stdin is not a tty. */ |
7697ac2b | 572 | if ((!isatty(fileno(stdin)) || stdin_null_flag) && !force_tty_flag) { |
5260325f | 573 | if (tty_flag) |
bbe88b6d | 574 | logit("Pseudo-terminal will not be allocated because stdin is not a terminal."); |
5260325f | 575 | tty_flag = 0; |
576 | } | |
8ce64345 | 577 | |
20244695 | 578 | /* |
579 | * Initialize "log" output. Since we are the client all output | |
580 | * actually goes to stderr. | |
581 | */ | |
cc44f691 | 582 | log_init(av[0], options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level, |
583 | SYSLOG_FACILITY_USER, 1); | |
5260325f | 584 | |
e591b98a | 585 | /* |
586 | * Read per-user configuration file. Ignore the system wide config | |
587 | * file if the user specifies a config file on the command line. | |
588 | */ | |
589 | if (config != NULL) { | |
f7f14143 | 590 | if (!read_config_file(config, host, &options, 0)) |
93111dfa | 591 | fatal("Can't open user config file %.100s: " |
592 | "%.100s", config, strerror(errno)); | |
e591b98a | 593 | } else { |
594 | snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, | |
595 | _PATH_SSH_USER_CONFFILE); | |
9f6cab4b | 596 | (void)read_config_file(buf, host, &options, 1); |
e591b98a | 597 | |
f67792f2 | 598 | /* Read systemwide configuration file after use config. */ |
f2107e97 | 599 | (void)read_config_file(_PATH_HOST_CONFIG_FILE, host, |
9f6cab4b | 600 | &options, 0); |
e591b98a | 601 | } |
5260325f | 602 | |
603 | /* Fill configuration defaults. */ | |
604 | fill_default_options(&options); | |
605 | ||
1572b90f | 606 | channel_set_af(options.address_family); |
607 | ||
5260325f | 608 | /* reinit */ |
20244695 | 609 | log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 1); |
5260325f | 610 | |
e339aa53 | 611 | seed_rng(); |
612 | ||
5260325f | 613 | if (options.user == NULL) |
614 | options.user = xstrdup(pw->pw_name); | |
615 | ||
616 | if (options.hostname != NULL) | |
617 | host = options.hostname; | |
618 | ||
03c82656 | 619 | /* force lowercase for hostkey matching */ |
620 | if (options.host_key_alias != NULL) { | |
621 | for (p = options.host_key_alias; *p; p++) | |
622 | if (isupper(*p)) | |
623 | *p = tolower(*p); | |
624 | } | |
625 | ||
de574442 | 626 | /* Get default port if port has not been set. */ |
627 | if (options.port == 0) { | |
628 | sp = getservbyname(SSH_SERVICE_NAME, "tcp"); | |
629 | options.port = sp ? ntohs(sp->s_port) : SSH_DEFAULT_PORT; | |
630 | } | |
631 | ||
f78bde70 | 632 | if (options.proxy_command != NULL && |
633 | strcmp(options.proxy_command, "none") == 0) | |
634 | options.proxy_command = NULL; | |
699255b5 | 635 | if (options.control_path != NULL && |
636 | strcmp(options.control_path, "none") == 0) | |
637 | options.control_path = NULL; | |
f78bde70 | 638 | |
5e96b616 | 639 | if (options.control_path != NULL) { |
a980cbd7 | 640 | snprintf(buf, sizeof(buf), "%d", options.port); |
641 | cp = tilde_expand_filename(options.control_path, | |
642 | original_real_uid); | |
643 | options.control_path = percent_expand(cp, "p", buf, "h", host, | |
644 | "r", options.user, (char *)NULL); | |
645 | xfree(cp); | |
5e96b616 | 646 | } |
19186c3d | 647 | if (mux_command != 0 && options.control_path == NULL) |
648 | fatal("No ControlPath specified for \"-O\" command"); | |
9dfd96d6 | 649 | if (options.control_path != NULL) |
cc8ca1e6 | 650 | control_client(options.control_path); |
5e96b616 | 651 | |
6ffc9c88 | 652 | /* Open a connection to the remote host. */ |
1572b90f | 653 | if (ssh_connect(host, &hostaddr, options.port, |
654 | options.address_family, options.connection_attempts, | |
d514c907 | 655 | #ifdef HAVE_CYGWIN |
656 | options.use_privileged_port, | |
657 | #else | |
3fb156df | 658 | original_effective_uid == 0 && options.use_privileged_port, |
d514c907 | 659 | #endif |
de60473e | 660 | options.proxy_command) != 0) |
3aa43b24 | 661 | exit(255); |
5260325f | 662 | |
aa3378df | 663 | /* |
664 | * If we successfully made the connection, load the host private key | |
665 | * in case we will need it later for combined rsa-rhosts | |
666 | * authentication. This must be done before releasing extra | |
667 | * privileges, because the file is only readable by root. | |
78660ed4 | 668 | * If we cannot access the private keys, load the public keys |
669 | * instead and try to execute the ssh-keysign helper instead. | |
aa3378df | 670 | */ |
8002af61 | 671 | sensitive_data.nkeys = 0; |
672 | sensitive_data.keys = NULL; | |
39c00dc2 | 673 | sensitive_data.external_keysign = 0; |
b34bec32 | 674 | if (options.rhosts_rsa_authentication || |
675 | options.hostbased_authentication) { | |
8002af61 | 676 | sensitive_data.nkeys = 3; |
343288b8 | 677 | sensitive_data.keys = xmalloc(sensitive_data.nkeys * |
678 | sizeof(Key)); | |
3fb156df | 679 | |
680 | PRIV_START; | |
8002af61 | 681 | sensitive_data.keys[0] = key_load_private_type(KEY_RSA1, |
aeaa3d9e | 682 | _PATH_HOST_KEY_FILE, "", NULL); |
8002af61 | 683 | sensitive_data.keys[1] = key_load_private_type(KEY_DSA, |
684 | _PATH_HOST_DSA_KEY_FILE, "", NULL); | |
685 | sensitive_data.keys[2] = key_load_private_type(KEY_RSA, | |
686 | _PATH_HOST_RSA_KEY_FILE, "", NULL); | |
3fb156df | 687 | PRIV_END; |
39c00dc2 | 688 | |
60cd0a97 | 689 | if (options.hostbased_authentication == 1 && |
690 | sensitive_data.keys[0] == NULL && | |
39c00dc2 | 691 | sensitive_data.keys[1] == NULL && |
692 | sensitive_data.keys[2] == NULL) { | |
693 | sensitive_data.keys[1] = key_load_public( | |
694 | _PATH_HOST_DSA_KEY_FILE, NULL); | |
695 | sensitive_data.keys[2] = key_load_public( | |
696 | _PATH_HOST_RSA_KEY_FILE, NULL); | |
697 | sensitive_data.external_keysign = 1; | |
698 | } | |
5260325f | 699 | } |
aa3378df | 700 | /* |
701 | * Get rid of any extra privileges that we may have. We will no | |
702 | * longer need them. Also, extra privileges could make it very hard | |
703 | * to read identity files and other non-world-readable files from the | |
704 | * user's home directory if it happens to be on a NFS volume where | |
705 | * root is mapped to nobody. | |
706 | */ | |
6213295d | 707 | if (original_effective_uid == 0) { |
708 | PRIV_START; | |
709 | permanently_set_uid(pw); | |
710 | } | |
5260325f | 711 | |
aa3378df | 712 | /* |
713 | * Now that we are back to our own permissions, create ~/.ssh | |
7b9b0103 | 714 | * directory if it doesn't already exist. |
aa3378df | 715 | */ |
c3abff07 | 716 | snprintf(buf, sizeof buf, "%.100s%s%.100s", pw->pw_dir, strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR); |
5260325f | 717 | if (stat(buf, &st) < 0) |
704b1659 | 718 | if (mkdir(buf, 0700) < 0) |
5260325f | 719 | error("Could not create directory '%.200s'.", buf); |
720 | ||
fee56204 | 721 | /* load options.identity_files */ |
722 | load_public_identity_files(); | |
723 | ||
724 | /* Expand ~ in known host file names. */ | |
725 | /* XXX mem-leaks: */ | |
fa08c86b | 726 | options.system_hostfile = |
727 | tilde_expand_filename(options.system_hostfile, original_real_uid); | |
728 | options.user_hostfile = | |
729 | tilde_expand_filename(options.user_hostfile, original_real_uid); | |
730 | options.system_hostfile2 = | |
731 | tilde_expand_filename(options.system_hostfile2, original_real_uid); | |
732 | options.user_hostfile2 = | |
733 | tilde_expand_filename(options.user_hostfile2, original_real_uid); | |
5260325f | 734 | |
67b75437 | 735 | signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */ |
736 | ||
5260325f | 737 | /* Log into the remote system. This never returns if the login fails. */ |
39c00dc2 | 738 | ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr, pw); |
8002af61 | 739 | |
740 | /* We no longer need the private host keys. Clear them now. */ | |
741 | if (sensitive_data.nkeys != 0) { | |
742 | for (i = 0; i < sensitive_data.nkeys; i++) { | |
743 | if (sensitive_data.keys[i] != NULL) { | |
744 | /* Destroys contents safely */ | |
745 | debug3("clear hostkey %d", i); | |
746 | key_free(sensitive_data.keys[i]); | |
747 | sensitive_data.keys[i] = NULL; | |
748 | } | |
749 | } | |
750 | xfree(sensitive_data.keys); | |
751 | } | |
05b7537a | 752 | for (i = 0; i < options.num_identity_files; i++) { |
753 | if (options.identity_files[i]) { | |
754 | xfree(options.identity_files[i]); | |
755 | options.identity_files[i] = NULL; | |
756 | } | |
757 | if (options.identity_keys[i]) { | |
758 | key_free(options.identity_keys[i]); | |
759 | options.identity_keys[i] = NULL; | |
760 | } | |
761 | } | |
5260325f | 762 | |
8ce64345 | 763 | exit_status = compat20 ? ssh_session2() : ssh_session(); |
764 | packet_close(); | |
6939bbd4 | 765 | |
5e96b616 | 766 | if (options.control_path != NULL && control_fd != -1) |
767 | unlink(options.control_path); | |
768 | ||
6939bbd4 | 769 | /* |
aff51935 | 770 | * Send SIGHUP to proxy command if used. We don't wait() in |
6939bbd4 | 771 | * case it hangs and instead rely on init to reap the child |
772 | */ | |
773 | if (proxy_command_pid > 1) | |
774 | kill(proxy_command_pid, SIGHUP); | |
775 | ||
8ce64345 | 776 | return exit_status; |
777 | } | |
778 | ||
396c147e | 779 | static void |
fa08c86b | 780 | ssh_init_forwarding(void) |
781 | { | |
02a024dd | 782 | int success = 0; |
fa08c86b | 783 | int i; |
02a024dd | 784 | |
fa08c86b | 785 | /* Initiate local TCP/IP port forwardings. */ |
786 | for (i = 0; i < options.num_local_forwards; i++) { | |
3867aa0a | 787 | debug("Local connections to %.200s:%d forwarded to remote " |
788 | "address %.200s:%d", | |
f8cc7664 | 789 | (options.local_forwards[i].listen_host == NULL) ? |
790 | (options.gateway_ports ? "*" : "LOCALHOST") : | |
3867aa0a | 791 | options.local_forwards[i].listen_host, |
792 | options.local_forwards[i].listen_port, | |
793 | options.local_forwards[i].connect_host, | |
794 | options.local_forwards[i].connect_port); | |
5641aefa | 795 | success += channel_setup_local_fwd_listener( |
3867aa0a | 796 | options.local_forwards[i].listen_host, |
797 | options.local_forwards[i].listen_port, | |
798 | options.local_forwards[i].connect_host, | |
799 | options.local_forwards[i].connect_port, | |
fa08c86b | 800 | options.gateway_ports); |
801 | } | |
02a024dd | 802 | if (i > 0 && success == 0) |
803 | error("Could not request local forwarding."); | |
fa08c86b | 804 | |
805 | /* Initiate remote TCP/IP port forwardings. */ | |
806 | for (i = 0; i < options.num_remote_forwards; i++) { | |
3867aa0a | 807 | debug("Remote connections from %.200s:%d forwarded to " |
808 | "local address %.200s:%d", | |
56964485 | 809 | (options.remote_forwards[i].listen_host == NULL) ? |
aa9bc1de | 810 | "LOCALHOST" : options.remote_forwards[i].listen_host, |
3867aa0a | 811 | options.remote_forwards[i].listen_port, |
812 | options.remote_forwards[i].connect_host, | |
813 | options.remote_forwards[i].connect_port); | |
fa08c86b | 814 | channel_request_remote_forwarding( |
3867aa0a | 815 | options.remote_forwards[i].listen_host, |
816 | options.remote_forwards[i].listen_port, | |
817 | options.remote_forwards[i].connect_host, | |
818 | options.remote_forwards[i].connect_port); | |
fa08c86b | 819 | } |
820 | } | |
821 | ||
396c147e | 822 | static void |
fa08c86b | 823 | check_agent_present(void) |
824 | { | |
825 | if (options.forward_agent) { | |
7b9b0103 | 826 | /* Clear agent forwarding if we don't have an agent. */ |
8b10e20e | 827 | if (!ssh_agent_present()) |
fa08c86b | 828 | options.forward_agent = 0; |
fa08c86b | 829 | } |
830 | } | |
831 | ||
396c147e | 832 | static int |
8ce64345 | 833 | ssh_session(void) |
834 | { | |
835 | int type; | |
8ce64345 | 836 | int interactive = 0; |
837 | int have_tty = 0; | |
838 | struct winsize ws; | |
8ce64345 | 839 | char *cp; |
9bf083eb | 840 | const char *display; |
8ce64345 | 841 | |
5260325f | 842 | /* Enable compression if requested. */ |
843 | if (options.compression) { | |
844 | debug("Requesting compression at level %d.", options.compression_level); | |
845 | ||
846 | if (options.compression_level < 1 || options.compression_level > 9) | |
847 | fatal("Compression level must be from 1 (fast) to 9 (slow, best)."); | |
848 | ||
849 | /* Send the request. */ | |
850 | packet_start(SSH_CMSG_REQUEST_COMPRESSION); | |
851 | packet_put_int(options.compression_level); | |
852 | packet_send(); | |
853 | packet_write_wait(); | |
54a5250f | 854 | type = packet_read(); |
5260325f | 855 | if (type == SSH_SMSG_SUCCESS) |
856 | packet_start_compression(options.compression_level); | |
857 | else if (type == SSH_SMSG_FAILURE) | |
bbe88b6d | 858 | logit("Warning: Remote host refused compression."); |
5260325f | 859 | else |
860 | packet_disconnect("Protocol error waiting for compression response."); | |
861 | } | |
862 | /* Allocate a pseudo tty if appropriate. */ | |
863 | if (tty_flag) { | |
864 | debug("Requesting pty."); | |
865 | ||
866 | /* Start the packet. */ | |
867 | packet_start(SSH_CMSG_REQUEST_PTY); | |
868 | ||
869 | /* Store TERM in the packet. There is no limit on the | |
870 | length of the string. */ | |
871 | cp = getenv("TERM"); | |
872 | if (!cp) | |
873 | cp = ""; | |
449c5ba5 | 874 | packet_put_cstring(cp); |
5260325f | 875 | |
876 | /* Store window size in the packet. */ | |
877 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) | |
878 | memset(&ws, 0, sizeof(ws)); | |
879 | packet_put_int(ws.ws_row); | |
880 | packet_put_int(ws.ws_col); | |
881 | packet_put_int(ws.ws_xpixel); | |
882 | packet_put_int(ws.ws_ypixel); | |
883 | ||
884 | /* Store tty modes in the packet. */ | |
30dcc918 | 885 | tty_make_modes(fileno(stdin), NULL); |
5260325f | 886 | |
887 | /* Send the packet, and wait for it to leave. */ | |
888 | packet_send(); | |
889 | packet_write_wait(); | |
890 | ||
891 | /* Read response from the server. */ | |
54a5250f | 892 | type = packet_read(); |
4fe2af09 | 893 | if (type == SSH_SMSG_SUCCESS) { |
5260325f | 894 | interactive = 1; |
8ce64345 | 895 | have_tty = 1; |
4fe2af09 | 896 | } else if (type == SSH_SMSG_FAILURE) |
bbe88b6d | 897 | logit("Warning: Remote host failed or refused to allocate a pseudo tty."); |
5260325f | 898 | else |
899 | packet_disconnect("Protocol error waiting for pty request response."); | |
900 | } | |
901 | /* Request X11 forwarding if enabled and DISPLAY is set. */ | |
9bf083eb | 902 | display = getenv("DISPLAY"); |
903 | if (options.forward_x11 && display != NULL) { | |
b48eeb07 | 904 | char *proto, *data; |
0b242b12 | 905 | /* Get reasonable local authentication information. */ |
9bf083eb | 906 | client_x11_get_proto(display, options.xauth_location, |
907 | options.forward_x11_trusted, &proto, &data); | |
0b242b12 | 908 | /* Request forwarding with authentication spoofing. */ |
5260325f | 909 | debug("Requesting X11 forwarding with authentication spoofing."); |
9bf083eb | 910 | x11_request_forwarding_with_spoofing(0, display, proto, data); |
5260325f | 911 | |
912 | /* Read response from the server. */ | |
54a5250f | 913 | type = packet_read(); |
5260325f | 914 | if (type == SSH_SMSG_SUCCESS) { |
5260325f | 915 | interactive = 1; |
0b242b12 | 916 | } else if (type == SSH_SMSG_FAILURE) { |
bbe88b6d | 917 | logit("Warning: Remote host denied X11 forwarding."); |
0b242b12 | 918 | } else { |
5260325f | 919 | packet_disconnect("Protocol error waiting for X11 forwarding"); |
0b242b12 | 920 | } |
5260325f | 921 | } |
922 | /* Tell the packet module whether this is an interactive session. */ | |
b5c334cc | 923 | packet_set_interactive(interactive); |
5260325f | 924 | |
925 | /* Request authentication agent forwarding if appropriate. */ | |
fa08c86b | 926 | check_agent_present(); |
927 | ||
5260325f | 928 | if (options.forward_agent) { |
929 | debug("Requesting authentication agent forwarding."); | |
930 | auth_request_forwarding(); | |
931 | ||
932 | /* Read response from the server. */ | |
54a5250f | 933 | type = packet_read(); |
95500969 | 934 | packet_check_eom(); |
5260325f | 935 | if (type != SSH_SMSG_SUCCESS) |
bbe88b6d | 936 | logit("Warning: Remote host denied authentication agent forwarding."); |
5260325f | 937 | } |
8efc0c15 | 938 | |
fa08c86b | 939 | /* Initiate port forwardings. */ |
940 | ssh_init_forwarding(); | |
5260325f | 941 | |
aa3378df | 942 | /* If requested, let ssh continue in the background. */ |
6ae2364d | 943 | if (fork_after_authentication_flag) |
aa3378df | 944 | if (daemon(1, 1) < 0) |
945 | fatal("daemon() failed: %.200s", strerror(errno)); | |
946 | ||
947 | /* | |
948 | * If a command was specified on the command line, execute the | |
949 | * command now. Otherwise request the server to start a shell. | |
950 | */ | |
5260325f | 951 | if (buffer_len(&command) > 0) { |
952 | int len = buffer_len(&command); | |
953 | if (len > 900) | |
954 | len = 900; | |
6c0fa2b1 | 955 | debug("Sending command: %.*s", len, (u_char *)buffer_ptr(&command)); |
5260325f | 956 | packet_start(SSH_CMSG_EXEC_CMD); |
957 | packet_put_string(buffer_ptr(&command), buffer_len(&command)); | |
958 | packet_send(); | |
959 | packet_write_wait(); | |
960 | } else { | |
961 | debug("Requesting shell."); | |
962 | packet_start(SSH_CMSG_EXEC_SHELL); | |
963 | packet_send(); | |
964 | packet_write_wait(); | |
965 | } | |
966 | ||
967 | /* Enter the interactive session. */ | |
4bf9c10e | 968 | return client_loop(have_tty, tty_flag ? |
969 | options.escape_char : SSH_ESCAPECHAR_NONE, 0); | |
8ce64345 | 970 | } |
5260325f | 971 | |
396c147e | 972 | static void |
5e96b616 | 973 | ssh_subsystem_reply(int type, u_int32_t seq, void *ctxt) |
1f3bf5aa | 974 | { |
975 | int id, len; | |
976 | ||
977 | id = packet_get_int(); | |
978 | len = buffer_len(&command); | |
ce91d6f8 | 979 | if (len > 900) |
980 | len = 900; | |
95500969 | 981 | packet_check_eom(); |
1f3bf5aa | 982 | if (type == SSH2_MSG_CHANNEL_FAILURE) |
983 | fatal("Request for subsystem '%.*s' failed on channel %d", | |
6c0fa2b1 | 984 | len, (u_char *)buffer_ptr(&command), id); |
1f3bf5aa | 985 | } |
986 | ||
e0ae8728 | 987 | void |
5d8d32a3 | 988 | client_global_request_reply_fwd(int type, u_int32_t seq, void *ctxt) |
e0ae8728 | 989 | { |
990 | int i; | |
991 | ||
992 | i = client_global_request_id++; | |
5d8d32a3 | 993 | if (i >= options.num_remote_forwards) |
e0ae8728 | 994 | return; |
e0ae8728 | 995 | debug("remote forward %s for: listen %d, connect %s:%d", |
996 | type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure", | |
3867aa0a | 997 | options.remote_forwards[i].listen_port, |
998 | options.remote_forwards[i].connect_host, | |
999 | options.remote_forwards[i].connect_port); | |
e0ae8728 | 1000 | if (type == SSH2_MSG_REQUEST_FAILURE) |
3867aa0a | 1001 | logit("Warning: remote port forwarding failed for listen " |
1002 | "port %d", options.remote_forwards[i].listen_port); | |
e0ae8728 | 1003 | } |
1004 | ||
396c147e | 1005 | static void |
5e96b616 | 1006 | ssh_control_listener(void) |
8ce64345 | 1007 | { |
5e96b616 | 1008 | struct sockaddr_un addr; |
1009 | mode_t old_umask; | |
4b5df124 | 1010 | int addr_len; |
1011 | ||
9dfd96d6 | 1012 | if (options.control_path == NULL || |
1013 | options.control_master == SSHCTL_MASTER_NO) | |
5e96b616 | 1014 | return; |
b5c334cc | 1015 | |
9dfd96d6 | 1016 | debug("setting up multiplex master socket"); |
1017 | ||
5e96b616 | 1018 | memset(&addr, '\0', sizeof(addr)); |
1019 | addr.sun_family = AF_UNIX; | |
4b5df124 | 1020 | addr_len = offsetof(struct sockaddr_un, sun_path) + |
5e96b616 | 1021 | strlen(options.control_path) + 1; |
8ce64345 | 1022 | |
5e96b616 | 1023 | if (strlcpy(addr.sun_path, options.control_path, |
1024 | sizeof(addr.sun_path)) >= sizeof(addr.sun_path)) | |
1025 | fatal("ControlPath too long"); | |
8ce64345 | 1026 | |
5e96b616 | 1027 | if ((control_fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) |
17318dd6 | 1028 | fatal("%s socket(): %s", __func__, strerror(errno)); |
5e96b616 | 1029 | |
1030 | old_umask = umask(0177); | |
4b5df124 | 1031 | if (bind(control_fd, (struct sockaddr*)&addr, addr_len) == -1) { |
5e96b616 | 1032 | control_fd = -1; |
05ada1a6 | 1033 | if (errno == EINVAL || errno == EADDRINUSE) |
5e96b616 | 1034 | fatal("ControlSocket %s already exists", |
1035 | options.control_path); | |
1036 | else | |
17318dd6 | 1037 | fatal("%s bind(): %s", __func__, strerror(errno)); |
8ce64345 | 1038 | } |
5e96b616 | 1039 | umask(old_umask); |
1040 | ||
1041 | if (listen(control_fd, 64) == -1) | |
17318dd6 | 1042 | fatal("%s listen(): %s", __func__, strerror(errno)); |
5e96b616 | 1043 | |
1044 | set_nonblock(control_fd); | |
1045 | } | |
1046 | ||
1047 | /* request pty/x11/agent/tcpfwd/shell for channel */ | |
1048 | static void | |
1049 | ssh_session2_setup(int id, void *arg) | |
1050 | { | |
1786be35 | 1051 | extern char **environ; |
9bf083eb | 1052 | const char *display; |
5e96b616 | 1053 | int interactive = tty_flag; |
9bf083eb | 1054 | |
56964485 | 1055 | display = getenv("DISPLAY"); |
9bf083eb | 1056 | if (options.forward_x11 && display != NULL) { |
b48eeb07 | 1057 | char *proto, *data; |
0b242b12 | 1058 | /* Get reasonable local authentication information. */ |
9bf083eb | 1059 | client_x11_get_proto(display, options.xauth_location, |
1060 | options.forward_x11_trusted, &proto, &data); | |
0b242b12 | 1061 | /* Request forwarding with authentication spoofing. */ |
1062 | debug("Requesting X11 forwarding with authentication spoofing."); | |
9bf083eb | 1063 | x11_request_forwarding_with_spoofing(id, display, proto, data); |
b5c334cc | 1064 | interactive = 1; |
0b242b12 | 1065 | /* XXX wait for reply */ |
1066 | } | |
1067 | ||
fa08c86b | 1068 | check_agent_present(); |
1069 | if (options.forward_agent) { | |
1070 | debug("Requesting authentication agent forwarding."); | |
1071 | channel_request_start(id, "auth-agent-req@openssh.com", 0); | |
1072 | packet_send(); | |
1073 | } | |
1074 | ||
a4f24bf8 | 1075 | if (options.tun_open != SSH_TUNMODE_NO) { |
d20f3c9e | 1076 | Channel *c; |
1077 | int fd; | |
1078 | ||
1079 | debug("Requesting tun."); | |
a4f24bf8 | 1080 | if ((fd = tun_open(options.tun_local, |
1081 | options.tun_open)) >= 0) { | |
d20f3c9e | 1082 | c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1, |
1083 | CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, | |
1084 | 0, "tun", 1); | |
1085 | c->datagram = 1; | |
e914f53a | 1086 | #if defined(SSH_TUN_FILTER) |
1087 | if (options.tun_open == SSH_TUNMODE_POINTOPOINT) | |
1088 | channel_register_filter(c->self, sys_tun_infilter, | |
1089 | sys_tun_outfilter); | |
1090 | #endif | |
d20f3c9e | 1091 | packet_start(SSH2_MSG_CHANNEL_OPEN); |
1092 | packet_put_cstring("tun@openssh.com"); | |
1093 | packet_put_int(c->self); | |
1094 | packet_put_int(c->local_window_max); | |
1095 | packet_put_int(c->local_maxpacket); | |
a4f24bf8 | 1096 | packet_put_int(options.tun_open); |
d20f3c9e | 1097 | packet_put_int(options.tun_remote); |
1098 | packet_send(); | |
1099 | } | |
1100 | } | |
1101 | ||
5e96b616 | 1102 | client_session2_setup(id, tty_flag, subsystem_flag, getenv("TERM"), |
1786be35 | 1103 | NULL, fileno(stdin), &command, environ, &ssh_subsystem_reply); |
1f3bf5aa | 1104 | |
b5c334cc | 1105 | packet_set_interactive(interactive); |
8ce64345 | 1106 | } |
1107 | ||
bcdb96c2 | 1108 | /* open new channel for a session */ |
396c147e | 1109 | static int |
bcdb96c2 | 1110 | ssh_session2_open(void) |
8ce64345 | 1111 | { |
719fc62f | 1112 | Channel *c; |
1113 | int window, packetmax, in, out, err; | |
2e73a022 | 1114 | |
14a9a859 | 1115 | if (stdin_null_flag) { |
5ca51e19 | 1116 | in = open(_PATH_DEVNULL, O_RDONLY); |
14a9a859 | 1117 | } else { |
1118 | in = dup(STDIN_FILENO); | |
1119 | } | |
2e73a022 | 1120 | out = dup(STDOUT_FILENO); |
1121 | err = dup(STDERR_FILENO); | |
8ce64345 | 1122 | |
1123 | if (in < 0 || out < 0 || err < 0) | |
14a9a859 | 1124 | fatal("dup() in/out/err failed"); |
8ce64345 | 1125 | |
a22aff1f | 1126 | /* enable nonblocking unless tty */ |
1127 | if (!isatty(in)) | |
1128 | set_nonblock(in); | |
1129 | if (!isatty(out)) | |
1130 | set_nonblock(out); | |
1131 | if (!isatty(err)) | |
1132 | set_nonblock(err); | |
1133 | ||
bcbf86ec | 1134 | window = CHAN_SES_WINDOW_DEFAULT; |
1135 | packetmax = CHAN_SES_PACKET_DEFAULT; | |
ea9700ba | 1136 | if (tty_flag) { |
1137 | window >>= 1; | |
1138 | packetmax >>= 1; | |
8ce64345 | 1139 | } |
719fc62f | 1140 | c = channel_new( |
8ce64345 | 1141 | "session", SSH_CHANNEL_OPENING, in, out, err, |
bcbf86ec | 1142 | window, packetmax, CHAN_EXTENDED_WRITE, |
0d942eff | 1143 | "client-session", /*nonblock*/0); |
8ce64345 | 1144 | |
bcdb96c2 | 1145 | debug3("ssh_session2_open: channel_new: %d", c->self); |
eb0dd41f | 1146 | |
36e1f6a1 | 1147 | channel_send_open(c->self); |
bcdb96c2 | 1148 | if (!no_shell_flag) |
5e96b616 | 1149 | channel_register_confirm(c->self, ssh_session2_setup, NULL); |
5260325f | 1150 | |
719fc62f | 1151 | return c->self; |
eb0dd41f | 1152 | } |
1153 | ||
396c147e | 1154 | static int |
eb0dd41f | 1155 | ssh_session2(void) |
1156 | { | |
bcdb96c2 | 1157 | int id = -1; |
eb0dd41f | 1158 | |
1159 | /* XXX should be pre-session */ | |
1160 | ssh_init_forwarding(); | |
5e96b616 | 1161 | ssh_control_listener(); |
eb0dd41f | 1162 | |
bcdb96c2 | 1163 | if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN)) |
1164 | id = ssh_session2_open(); | |
eb0dd41f | 1165 | |
d20f3c9e | 1166 | /* Execute a local command */ |
1167 | if (options.local_command != NULL && | |
1168 | options.permit_local_command) | |
1169 | ssh_local_cmd(options.local_command); | |
1170 | ||
eb0dd41f | 1171 | /* If requested, let ssh continue in the background. */ |
1172 | if (fork_after_authentication_flag) | |
1173 | if (daemon(1, 1) < 0) | |
1174 | fatal("daemon() failed: %.200s", strerror(errno)); | |
1175 | ||
4bf9c10e | 1176 | return client_loop(tty_flag, tty_flag ? |
1177 | options.escape_char : SSH_ESCAPECHAR_NONE, id); | |
8efc0c15 | 1178 | } |
fa08c86b | 1179 | |
396c147e | 1180 | static void |
fee56204 | 1181 | load_public_identity_files(void) |
1182 | { | |
1183 | char *filename; | |
2e23cde0 | 1184 | int i = 0; |
0659cace | 1185 | Key *public; |
383546c4 | 1186 | #ifdef SMARTCARD |
0659cace | 1187 | Key **keys; |
1188 | ||
9ff6f66f | 1189 | if (options.smartcard_device != NULL && |
0659cace | 1190 | options.num_identity_files < SSH_MAX_IDENTITY_FILES && |
1191 | (keys = sc_get_keys(options.smartcard_device, NULL)) != NULL ) { | |
1192 | int count = 0; | |
1193 | for (i = 0; keys[i] != NULL; i++) { | |
1194 | count++; | |
0659cace | 1195 | memmove(&options.identity_files[1], &options.identity_files[0], |
1196 | sizeof(char *) * (SSH_MAX_IDENTITY_FILES - 1)); | |
1197 | memmove(&options.identity_keys[1], &options.identity_keys[0], | |
1198 | sizeof(Key *) * (SSH_MAX_IDENTITY_FILES - 1)); | |
1199 | options.num_identity_files++; | |
1200 | options.identity_keys[0] = keys[i]; | |
244e796f | 1201 | options.identity_files[0] = sc_get_key_label(keys[i]); |
0659cace | 1202 | } |
1c2deed1 | 1203 | if (options.num_identity_files > SSH_MAX_IDENTITY_FILES) |
1204 | options.num_identity_files = SSH_MAX_IDENTITY_FILES; | |
0659cace | 1205 | i = count; |
1206 | xfree(keys); | |
383546c4 | 1207 | } |
3e984472 | 1208 | #endif /* SMARTCARD */ |
2e23cde0 | 1209 | for (; i < options.num_identity_files; i++) { |
1210 | filename = tilde_expand_filename(options.identity_files[i], | |
1211 | original_real_uid); | |
1212 | public = key_load_public(filename, NULL); | |
1213 | debug("identity file %s type %d", filename, | |
1214 | public ? public->type : -1); | |
1215 | xfree(options.identity_files[i]); | |
1216 | options.identity_files[i] = filename; | |
1217 | options.identity_keys[i] = public; | |
1218 | } | |
fee56204 | 1219 | } |
5e96b616 | 1220 | |
1221 | static void | |
1222 | control_client_sighandler(int signo) | |
1223 | { | |
1224 | control_client_terminate = signo; | |
1225 | } | |
1226 | ||
1227 | static void | |
1228 | control_client_sigrelay(int signo) | |
1229 | { | |
1230 | if (control_server_pid > 1) | |
1231 | kill(control_server_pid, signo); | |
1232 | } | |
1233 | ||
67a08279 | 1234 | static int |
1235 | env_permitted(char *env) | |
1236 | { | |
1237 | int i; | |
1238 | char name[1024], *cp; | |
1239 | ||
1240 | strlcpy(name, env, sizeof(name)); | |
1241 | if ((cp = strchr(name, '=')) == NULL) | |
1242 | return (0); | |
1243 | ||
1244 | *cp = '\0'; | |
1245 | ||
1246 | for (i = 0; i < options.num_send_env; i++) | |
1247 | if (match_pattern(name, options.send_env[i])) | |
1248 | return (1); | |
1249 | ||
1250 | return (0); | |
1251 | } | |
1252 | ||
5e96b616 | 1253 | static void |
1254 | control_client(const char *path) | |
1255 | { | |
1256 | struct sockaddr_un addr; | |
a7e124fe | 1257 | int i, r, fd, sock, exitval, num_env, addr_len; |
5e96b616 | 1258 | Buffer m; |
f8c6db83 | 1259 | char *term; |
1786be35 | 1260 | extern char **environ; |
f8c6db83 | 1261 | u_int flags; |
f2107e97 | 1262 | |
9dfd96d6 | 1263 | if (mux_command == 0) |
1264 | mux_command = SSHMUX_COMMAND_OPEN; | |
1265 | ||
1266 | switch (options.control_master) { | |
1267 | case SSHCTL_MASTER_AUTO: | |
1268 | case SSHCTL_MASTER_AUTO_ASK: | |
1269 | debug("auto-mux: Trying existing master"); | |
1270 | /* FALLTHROUGH */ | |
1271 | case SSHCTL_MASTER_NO: | |
1272 | break; | |
1273 | default: | |
1274 | return; | |
1275 | } | |
1276 | ||
5e96b616 | 1277 | memset(&addr, '\0', sizeof(addr)); |
1278 | addr.sun_family = AF_UNIX; | |
4b5df124 | 1279 | addr_len = offsetof(struct sockaddr_un, sun_path) + |
5e96b616 | 1280 | strlen(path) + 1; |
1281 | ||
1282 | if (strlcpy(addr.sun_path, path, | |
1283 | sizeof(addr.sun_path)) >= sizeof(addr.sun_path)) | |
1284 | fatal("ControlPath too long"); | |
1285 | ||
1286 | if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) | |
1287 | fatal("%s socket(): %s", __func__, strerror(errno)); | |
1288 | ||
cc8ca1e6 | 1289 | if (connect(sock, (struct sockaddr*)&addr, addr_len) == -1) { |
19186c3d | 1290 | if (mux_command != SSHMUX_COMMAND_OPEN) { |
1291 | fatal("Control socket connect(%.100s): %s", path, | |
1292 | strerror(errno)); | |
1293 | } | |
f6740270 | 1294 | if (errno == ENOENT) |
1295 | debug("Control socket \"%.100s\" does not exist", path); | |
1296 | else { | |
1297 | error("Control socket connect(%.100s): %s", path, | |
1298 | strerror(errno)); | |
1299 | } | |
ef07103c | 1300 | close(sock); |
1301 | return; | |
1302 | } | |
56964485 | 1303 | |
ef07103c | 1304 | if (stdin_null_flag) { |
1305 | if ((fd = open(_PATH_DEVNULL, O_RDONLY)) == -1) | |
1306 | fatal("open(/dev/null): %s", strerror(errno)); | |
1307 | if (dup2(fd, STDIN_FILENO) == -1) | |
1308 | fatal("dup2: %s", strerror(errno)); | |
1309 | if (fd > STDERR_FILENO) | |
1310 | close(fd); | |
1311 | } | |
56964485 | 1312 | |
ef07103c | 1313 | term = getenv("TERM"); |
f8c6db83 | 1314 | |
1315 | flags = 0; | |
1316 | if (tty_flag) | |
1317 | flags |= SSHMUX_FLAG_TTY; | |
1318 | if (subsystem_flag) | |
1319 | flags |= SSHMUX_FLAG_SUBSYS; | |
ef07103c | 1320 | if (options.forward_x11) |
1321 | flags |= SSHMUX_FLAG_X11_FWD; | |
1322 | if (options.forward_agent) | |
1323 | flags |= SSHMUX_FLAG_AGENT_FWD; | |
5e96b616 | 1324 | |
5e96b616 | 1325 | buffer_init(&m); |
1326 | ||
f8c6db83 | 1327 | /* Send our command to server */ |
1328 | buffer_put_int(&m, mux_command); | |
1329 | buffer_put_int(&m, flags); | |
ef07103c | 1330 | if (ssh_msg_send(sock, SSHMUX_VER, &m) == -1) |
f8c6db83 | 1331 | fatal("%s: msg_send", __func__); |
1332 | buffer_clear(&m); | |
1333 | ||
1334 | /* Get authorisation status and PID of controlee */ | |
5e96b616 | 1335 | if (ssh_msg_recv(sock, &m) == -1) |
1336 | fatal("%s: msg_recv", __func__); | |
ef07103c | 1337 | if (buffer_get_char(&m) != SSHMUX_VER) |
5e96b616 | 1338 | fatal("%s: wrong version", __func__); |
0d34d6ce | 1339 | if (buffer_get_int(&m) != 1) |
1340 | fatal("Connection to master denied"); | |
5e96b616 | 1341 | control_server_pid = buffer_get_int(&m); |
1342 | ||
5e96b616 | 1343 | buffer_clear(&m); |
5e96b616 | 1344 | |
f8c6db83 | 1345 | switch (mux_command) { |
1346 | case SSHMUX_COMMAND_ALIVE_CHECK: | |
f8cc7664 | 1347 | fprintf(stderr, "Master running (pid=%d)\r\n", |
f8c6db83 | 1348 | control_server_pid); |
1349 | exit(0); | |
1350 | case SSHMUX_COMMAND_TERMINATE: | |
1351 | fprintf(stderr, "Exit request sent.\r\n"); | |
1352 | exit(0); | |
1353 | case SSHMUX_COMMAND_OPEN: | |
1354 | /* continue below */ | |
1355 | break; | |
1356 | default: | |
1357 | fatal("silly mux_command %d", mux_command); | |
1358 | } | |
1359 | ||
1360 | /* SSHMUX_COMMAND_OPEN */ | |
ef07103c | 1361 | buffer_put_cstring(&m, term ? term : ""); |
5e96b616 | 1362 | buffer_append(&command, "\0", 1); |
1363 | buffer_put_cstring(&m, buffer_ptr(&command)); | |
1364 | ||
67a08279 | 1365 | if (options.num_send_env == 0 || environ == NULL) { |
1366 | buffer_put_int(&m, 0); | |
f2107e97 | 1367 | } else { |
67a08279 | 1368 | /* Pass environment */ |
1369 | num_env = 0; | |
1370 | for (i = 0; environ[i] != NULL; i++) | |
1371 | if (env_permitted(environ[i])) | |
1372 | num_env++; /* Count */ | |
f2107e97 | 1373 | |
67a08279 | 1374 | buffer_put_int(&m, num_env); |
1375 | ||
77c50919 | 1376 | for (i = 0; environ[i] != NULL && num_env >= 0; i++) |
1377 | if (env_permitted(environ[i])) { | |
1378 | num_env--; | |
67a08279 | 1379 | buffer_put_cstring(&m, environ[i]); |
77c50919 | 1380 | } |
67a08279 | 1381 | } |
1786be35 | 1382 | |
ef07103c | 1383 | if (ssh_msg_send(sock, SSHMUX_VER, &m) == -1) |
5e96b616 | 1384 | fatal("%s: msg_send", __func__); |
1385 | ||
1386 | mm_send_fd(sock, STDIN_FILENO); | |
1387 | mm_send_fd(sock, STDOUT_FILENO); | |
1388 | mm_send_fd(sock, STDERR_FILENO); | |
1389 | ||
1390 | /* Wait for reply, so master has a chance to gather ttymodes */ | |
1391 | buffer_clear(&m); | |
1392 | if (ssh_msg_recv(sock, &m) == -1) | |
1393 | fatal("%s: msg_recv", __func__); | |
ef07103c | 1394 | if (buffer_get_char(&m) != SSHMUX_VER) |
f8c6db83 | 1395 | fatal("%s: wrong version", __func__); |
5e96b616 | 1396 | buffer_free(&m); |
1397 | ||
d3e5d1e9 | 1398 | signal(SIGHUP, control_client_sighandler); |
78d2b454 | 1399 | signal(SIGINT, control_client_sighandler); |
1400 | signal(SIGTERM, control_client_sighandler); | |
1401 | signal(SIGWINCH, control_client_sigrelay); | |
1402 | ||
5e96b616 | 1403 | if (tty_flag) |
1404 | enter_raw_mode(); | |
1405 | ||
1406 | /* Stick around until the controlee closes the client_fd */ | |
1407 | exitval = 0; | |
1408 | for (;!control_client_terminate;) { | |
1409 | r = read(sock, &exitval, sizeof(exitval)); | |
1410 | if (r == 0) { | |
1411 | debug2("Received EOF from master"); | |
1412 | break; | |
1413 | } | |
1414 | if (r > 0) | |
1415 | debug2("Received exit status from master %d", exitval); | |
1416 | if (r == -1 && errno != EINTR) | |
1417 | fatal("%s: read %s", __func__, strerror(errno)); | |
1418 | } | |
1419 | ||
1420 | if (control_client_terminate) | |
1421 | debug2("Exiting on signal %d", control_client_terminate); | |
1422 | ||
1423 | close(sock); | |
1424 | ||
1425 | leave_raw_mode(); | |
1426 | ||
1427 | if (tty_flag && options.log_level != SYSLOG_LEVEL_QUIET) | |
1428 | fprintf(stderr, "Connection to master closed.\r\n"); | |
1429 | ||
1430 | exit(exitval); | |
1431 | } |