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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 | |
4095f623 | 44 | #include <sys/types.h> |
45 | #ifdef HAVE_SYS_STAT_H | |
46 | # include <sys/stat.h> | |
47 | #endif | |
876faccd | 48 | #include <sys/resource.h> |
bd7c69ea | 49 | #include <sys/ioctl.h> |
cebb4c24 | 50 | #include <sys/un.h> |
a75f5360 | 51 | |
b6438382 | 52 | #include <ctype.h> |
b5b88c19 | 53 | #ifdef HAVE_PATHS_H |
a75f5360 | 54 | #include <paths.h> |
b5b88c19 | 55 | #endif |
ada68823 | 56 | #include <signal.h> |
8efc0c15 | 57 | |
a306f2dd | 58 | #include <openssl/evp.h> |
fa08c86b | 59 | #include <openssl/err.h> |
a306f2dd | 60 | |
8efc0c15 | 61 | #include "ssh.h" |
42f11eb2 | 62 | #include "ssh1.h" |
63 | #include "ssh2.h" | |
64 | #include "compat.h" | |
65 | #include "cipher.h" | |
66 | #include "xmalloc.h" | |
8efc0c15 | 67 | #include "packet.h" |
68 | #include "buffer.h" | |
5e96b616 | 69 | #include "bufaux.h" |
a5efa1bb | 70 | #include "channels.h" |
a306f2dd | 71 | #include "key.h" |
4c8722d9 | 72 | #include "authfd.h" |
a306f2dd | 73 | #include "authfile.h" |
42f11eb2 | 74 | #include "pathnames.h" |
5e96b616 | 75 | #include "dispatch.h" |
b5c334cc | 76 | #include "clientloop.h" |
42f11eb2 | 77 | #include "log.h" |
78 | #include "readconf.h" | |
79 | #include "sshconnect.h" | |
42f11eb2 | 80 | #include "misc.h" |
b2552997 | 81 | #include "kex.h" |
82 | #include "mac.h" | |
07d80252 | 83 | #include "sshpty.h" |
61a2c1da | 84 | #include "match.h" |
5e96b616 | 85 | #include "msg.h" |
86 | #include "monitor_fdpass.h" | |
6213295d | 87 | #include "uidswap.h" |
8efc0c15 | 88 | |
383546c4 | 89 | #ifdef SMARTCARD |
383546c4 | 90 | #include "scard.h" |
dd2495cb | 91 | #endif |
383546c4 | 92 | |
f601d847 | 93 | extern char *__progname; |
f601d847 | 94 | |
5260325f | 95 | /* Flag indicating whether debug mode is on. This can be set on the command line. */ |
8efc0c15 | 96 | int debug_flag = 0; |
97 | ||
a8be9f80 | 98 | /* Flag indicating whether a tty should be allocated */ |
8efc0c15 | 99 | int tty_flag = 0; |
8abcdba4 | 100 | int no_tty_flag = 0; |
101 | int force_tty_flag = 0; | |
8efc0c15 | 102 | |
8ce64345 | 103 | /* don't exec a shell */ |
104 | int no_shell_flag = 0; | |
8ce64345 | 105 | |
aa3378df | 106 | /* |
107 | * Flag indicating that nothing should be read from stdin. This can be set | |
108 | * on the command line. | |
109 | */ | |
8efc0c15 | 110 | int stdin_null_flag = 0; |
111 | ||
aa3378df | 112 | /* |
113 | * Flag indicating that ssh should fork after authentication. This is useful | |
c242fc96 | 114 | * so that the passphrase can be entered manually, and then ssh goes to the |
aa3378df | 115 | * background. |
116 | */ | |
8efc0c15 | 117 | int fork_after_authentication_flag = 0; |
118 | ||
aa3378df | 119 | /* |
120 | * General data structure for command line options and options configurable | |
121 | * in configuration files. See readconf.h. | |
122 | */ | |
8efc0c15 | 123 | Options options; |
124 | ||
e591b98a | 125 | /* optional user configfile */ |
126 | char *config = NULL; | |
127 | ||
aa3378df | 128 | /* |
129 | * Name of the host we are connecting to. This is the name given on the | |
130 | * command line, or the HostName specified for the user-supplied name in a | |
131 | * configuration file. | |
132 | */ | |
8efc0c15 | 133 | char *host; |
134 | ||
135 | /* socket address the host resolves to */ | |
48e671d5 | 136 | struct sockaddr_storage hostaddr; |
8efc0c15 | 137 | |
8002af61 | 138 | /* Private host keys. */ |
39c00dc2 | 139 | Sensitive sensitive_data; |
8efc0c15 | 140 | |
141 | /* Original real UID. */ | |
142 | uid_t original_real_uid; | |
3fb156df | 143 | uid_t original_effective_uid; |
8efc0c15 | 144 | |
8ce64345 | 145 | /* command to be executed */ |
146 | Buffer command; | |
147 | ||
ae810de7 | 148 | /* Should we execute a command or invoke a subsystem? */ |
149 | int subsystem_flag = 0; | |
150 | ||
e0ae8728 | 151 | /* # of replies received for global requests */ |
152 | static int client_global_request_id = 0; | |
153 | ||
6939bbd4 | 154 | /* pid of proxycommand child process */ |
155 | pid_t proxy_command_pid = 0; | |
156 | ||
5e96b616 | 157 | /* fd to control socket */ |
158 | int control_fd = -1; | |
159 | ||
f8c6db83 | 160 | /* Multiplexing control command */ |
19186c3d | 161 | static u_int mux_command = 0; |
f8c6db83 | 162 | |
5e96b616 | 163 | /* Only used in control client mode */ |
164 | volatile sig_atomic_t control_client_terminate = 0; | |
165 | u_int control_server_pid = 0; | |
166 | ||
8efc0c15 | 167 | /* Prints a help message to the user. This function never returns. */ |
168 | ||
396c147e | 169 | static void |
5ca51e19 | 170 | usage(void) |
8efc0c15 | 171 | { |
182ccbba | 172 | fprintf(stderr, |
aeefce7a | 173 | "usage: ssh [-1246AaCfgkMNnqsTtVvXxY] [-b bind_address] [-c cipher_spec]\n" |
80e29ee6 | 174 | " [-D [bind_address:]port] [-e escape_char] [-F configfile]\n" |
8cf98c65 | 175 | " [-i identity_file] [-L [bind_address:]port:host:hostport]\n" |
3867aa0a | 176 | " [-l login_name] [-m mac_spec] [-O ctl_cmd] [-o option] [-p port]\n" |
8cf98c65 | 177 | " [-R [bind_address:]port:host:hostport] [-S ctl_path]\n" |
d20f3c9e | 178 | " [-w tunnel:tunnel] [user@]hostname [command]\n" |
182ccbba | 179 | ); |
3aa43b24 | 180 | exit(255); |
8efc0c15 | 181 | } |
182 | ||
396c147e | 183 | static int ssh_session(void); |
184 | static int ssh_session2(void); | |
185 | static void load_public_identity_files(void); | |
5e96b616 | 186 | static void control_client(const char *path); |
8ce64345 | 187 | |
5260325f | 188 | /* |
189 | * Main program for the ssh client. | |
190 | */ | |
8efc0c15 | 191 | int |
192 | main(int ac, char **av) | |
193 | { | |
b34bec32 | 194 | int i, opt, exit_status; |
1aafd17a | 195 | char *p, *cp, *line, buf[256]; |
5260325f | 196 | struct stat st; |
3b1a83df | 197 | struct passwd *pw; |
8ce64345 | 198 | int dummy; |
57dade33 | 199 | extern int optind, optreset; |
1812a662 | 200 | extern char *optarg; |
c1cbe68a | 201 | struct servent *sp; |
3867aa0a | 202 | Forward fwd; |
5260325f | 203 | |
fd6168c1 | 204 | /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ |
205 | sanitise_stdfd(); | |
206 | ||
fda04d7d | 207 | __progname = ssh_get_progname(av[0]); |
264dce47 | 208 | init_rng(); |
209 | ||
aa3378df | 210 | /* |
211 | * Save the original real uid. It will be needed later (uid-swapping | |
212 | * may clobber the real uid). | |
213 | */ | |
5260325f | 214 | original_real_uid = getuid(); |
215 | original_effective_uid = geteuid(); | |
aff51935 | 216 | |
9f324470 | 217 | /* |
218 | * Use uid-swapping to give up root privileges for the duration of | |
219 | * option processing. We will re-instantiate the rights when we are | |
220 | * ready to create the privileged port, and will permanently drop | |
221 | * them when the port has been created (actually, when the connection | |
222 | * has been made, as we may need to create the port several times). | |
223 | */ | |
224 | PRIV_END; | |
5260325f | 225 | |
7322ef0e | 226 | #ifdef HAVE_SETRLIMIT |
5260325f | 227 | /* If we are installed setuid root be careful to not drop core. */ |
228 | if (original_real_uid != original_effective_uid) { | |
229 | struct rlimit rlim; | |
230 | rlim.rlim_cur = rlim.rlim_max = 0; | |
231 | if (setrlimit(RLIMIT_CORE, &rlim) < 0) | |
232 | fatal("setrlimit failed: %.100s", strerror(errno)); | |
8efc0c15 | 233 | } |
3c62e7eb | 234 | #endif |
63bd8c36 | 235 | /* Get user data. */ |
236 | pw = getpwuid(original_real_uid); | |
237 | if (!pw) { | |
bbe88b6d | 238 | logit("You don't exist, go away!"); |
3aa43b24 | 239 | exit(255); |
63bd8c36 | 240 | } |
241 | /* Take a copy of the returned structure. */ | |
242 | pw = pwcopy(pw); | |
243 | ||
aa3378df | 244 | /* |
245 | * Set our umask to something reasonable, as some files are created | |
246 | * with the default umask. This will make them world-readable but | |
247 | * writable only by the owner, which is ok for all files for which we | |
248 | * don't set the modes explicitly. | |
249 | */ | |
5260325f | 250 | umask(022); |
251 | ||
5260325f | 252 | /* Initialize option structure to indicate that no values have been set. */ |
253 | initialize_options(&options); | |
254 | ||
255 | /* Parse command-line arguments. */ | |
256 | host = NULL; | |
257 | ||
16a5525d | 258 | again: |
f5a1a01a | 259 | while ((opt = getopt(ac, av, |
d20f3c9e | 260 | "1246ab:c:e:fgi:kl:m:no:p:qstvxACD:F:I:L:MNO:PR:S:TVw:XY")) != -1) { |
5260325f | 261 | switch (opt) { |
1f3bf5aa | 262 | case '1': |
263 | options.protocol = SSH_PROTO_1; | |
264 | break; | |
6ae2364d | 265 | case '2': |
266 | options.protocol = SSH_PROTO_2; | |
267 | break; | |
48e671d5 | 268 | case '4': |
1572b90f | 269 | options.address_family = AF_INET; |
48e671d5 | 270 | break; |
48e671d5 | 271 | case '6': |
1572b90f | 272 | options.address_family = AF_INET6; |
48e671d5 | 273 | break; |
5260325f | 274 | case 'n': |
275 | stdin_null_flag = 1; | |
276 | break; | |
5260325f | 277 | case 'f': |
278 | fork_after_authentication_flag = 1; | |
279 | stdin_null_flag = 1; | |
280 | break; | |
5260325f | 281 | case 'x': |
282 | options.forward_x11 = 0; | |
283 | break; | |
5260325f | 284 | case 'X': |
285 | options.forward_x11 = 1; | |
286 | break; | |
d73a67d7 | 287 | case 'Y': |
288 | options.forward_x11 = 1; | |
289 | options.forward_x11_trusted = 1; | |
290 | break; | |
5260325f | 291 | case 'g': |
292 | options.gateway_ports = 1; | |
293 | break; | |
f8c6db83 | 294 | case 'O': |
295 | if (strcmp(optarg, "check") == 0) | |
296 | mux_command = SSHMUX_COMMAND_ALIVE_CHECK; | |
297 | else if (strcmp(optarg, "exit") == 0) | |
298 | mux_command = SSHMUX_COMMAND_TERMINATE; | |
299 | else | |
300 | fatal("Invalid multiplex command."); | |
301 | break; | |
e59404d1 | 302 | case 'P': /* deprecated */ |
5260325f | 303 | options.use_privileged_port = 0; |
304 | break; | |
5260325f | 305 | case 'a': |
306 | options.forward_agent = 0; | |
307 | break; | |
71276795 | 308 | case 'A': |
309 | options.forward_agent = 1; | |
310 | break; | |
5260325f | 311 | case 'k': |
f7926e97 | 312 | options.gss_deleg_creds = 0; |
5260325f | 313 | break; |
5260325f | 314 | case 'i': |
315 | if (stat(optarg, &st) < 0) { | |
f5a1a01a | 316 | fprintf(stderr, "Warning: Identity file %s " |
ec304d66 | 317 | "not accessible: %s.\n", optarg, |
318 | strerror(errno)); | |
5260325f | 319 | break; |
320 | } | |
f5a1a01a | 321 | if (options.num_identity_files >= |
322 | SSH_MAX_IDENTITY_FILES) | |
323 | fatal("Too many identity files specified " | |
324 | "(max %d)", SSH_MAX_IDENTITY_FILES); | |
325 | options.identity_files[options.num_identity_files++] = | |
326 | xstrdup(optarg); | |
5260325f | 327 | break; |
383546c4 | 328 | case 'I': |
329 | #ifdef SMARTCARD | |
9ff6f66f | 330 | options.smartcard_device = xstrdup(optarg); |
dd2495cb | 331 | #else |
383546c4 | 332 | fprintf(stderr, "no support for smartcards.\n"); |
dd2495cb | 333 | #endif |
383546c4 | 334 | break; |
5260325f | 335 | case 't': |
8abcdba4 | 336 | if (tty_flag) |
337 | force_tty_flag = 1; | |
5260325f | 338 | tty_flag = 1; |
339 | break; | |
5260325f | 340 | case 'v': |
e053cd2c | 341 | if (debug_flag == 0) { |
bcbf86ec | 342 | debug_flag = 1; |
343 | options.log_level = SYSLOG_LEVEL_DEBUG1; | |
e053cd2c | 344 | } else { |
345 | if (options.log_level < SYSLOG_LEVEL_DEBUG3) | |
346 | options.log_level++; | |
bcbf86ec | 347 | break; |
e053cd2c | 348 | } |
59d4718a | 349 | /* FALLTHROUGH */ |
5260325f | 350 | case 'V': |
85ac7a84 | 351 | fprintf(stderr, "%s, %s\n", |
4526e8c2 | 352 | SSH_RELEASE, SSLeay_version(SSLEAY_VERSION)); |
5260325f | 353 | if (opt == 'V') |
354 | exit(0); | |
5260325f | 355 | break; |
d20f3c9e | 356 | case 'w': |
a4f24bf8 | 357 | if (options.tun_open == -1) |
358 | options.tun_open = SSH_TUNMODE_DEFAULT; | |
d20f3c9e | 359 | options.tun_local = a2tun(optarg, &options.tun_remote); |
a4f24bf8 | 360 | if (options.tun_local == SSH_TUNID_ERR) { |
d20f3c9e | 361 | fprintf(stderr, "Bad tun device '%s'\n", optarg); |
3aa43b24 | 362 | exit(255); |
d20f3c9e | 363 | } |
364 | break; | |
5260325f | 365 | case 'q': |
366 | options.log_level = SYSLOG_LEVEL_QUIET; | |
367 | break; | |
5260325f | 368 | case 'e': |
369 | if (optarg[0] == '^' && optarg[2] == 0 && | |
f5a1a01a | 370 | (u_char) optarg[1] >= 64 && |
371 | (u_char) optarg[1] < 128) | |
1e3b8b07 | 372 | options.escape_char = (u_char) optarg[1] & 31; |
5260325f | 373 | else if (strlen(optarg) == 1) |
1e3b8b07 | 374 | options.escape_char = (u_char) optarg[0]; |
5260325f | 375 | else if (strcmp(optarg, "none") == 0) |
4bf9c10e | 376 | options.escape_char = SSH_ESCAPECHAR_NONE; |
5260325f | 377 | else { |
f5a1a01a | 378 | fprintf(stderr, "Bad escape character '%s'.\n", |
379 | optarg); | |
3aa43b24 | 380 | exit(255); |
5260325f | 381 | } |
382 | break; | |
5260325f | 383 | case 'c': |
a306f2dd | 384 | if (ciphers_valid(optarg)) { |
385 | /* SSH2 only */ | |
386 | options.ciphers = xstrdup(optarg); | |
d77347cc | 387 | options.cipher = SSH_CIPHER_INVALID; |
a306f2dd | 388 | } else { |
389 | /* SSH1 only */ | |
c523303b | 390 | options.cipher = cipher_number(optarg); |
391 | if (options.cipher == -1) { | |
f5a1a01a | 392 | fprintf(stderr, |
393 | "Unknown cipher type '%s'\n", | |
394 | optarg); | |
3aa43b24 | 395 | exit(255); |
a306f2dd | 396 | } |
f5a1a01a | 397 | if (options.cipher == SSH_CIPHER_3DES) |
c523303b | 398 | options.ciphers = "3des-cbc"; |
f5a1a01a | 399 | else if (options.cipher == SSH_CIPHER_BLOWFISH) |
c523303b | 400 | options.ciphers = "blowfish-cbc"; |
f5a1a01a | 401 | else |
c523303b | 402 | options.ciphers = (char *)-1; |
5260325f | 403 | } |
404 | break; | |
b2552997 | 405 | case 'm': |
406 | if (mac_valid(optarg)) | |
407 | options.macs = xstrdup(optarg); | |
408 | else { | |
f5a1a01a | 409 | fprintf(stderr, "Unknown mac type '%s'\n", |
410 | optarg); | |
3aa43b24 | 411 | exit(255); |
b2552997 | 412 | } |
413 | break; | |
5e96b616 | 414 | case 'M': |
9dfd96d6 | 415 | if (options.control_master == SSHCTL_MASTER_YES) |
416 | options.control_master = SSHCTL_MASTER_ASK; | |
417 | else | |
418 | options.control_master = SSHCTL_MASTER_YES; | |
5e96b616 | 419 | break; |
5260325f | 420 | case 'p': |
2d2a2c65 | 421 | options.port = a2port(optarg); |
422 | if (options.port == 0) { | |
6031af8d | 423 | fprintf(stderr, "Bad port '%s'\n", optarg); |
3aa43b24 | 424 | exit(255); |
6031af8d | 425 | } |
5260325f | 426 | break; |
5260325f | 427 | case 'l': |
428 | options.user = optarg; | |
429 | break; | |
d2e3df16 | 430 | |
431 | case 'L': | |
3867aa0a | 432 | if (parse_forward(&fwd, optarg)) |
433 | add_local_forward(&options, &fwd); | |
434 | else { | |
f5a1a01a | 435 | fprintf(stderr, |
3867aa0a | 436 | "Bad local forwarding specification '%s'\n", |
f5a1a01a | 437 | optarg); |
3aa43b24 | 438 | exit(255); |
5260325f | 439 | } |
3867aa0a | 440 | break; |
441 | ||
442 | case 'R': | |
443 | if (parse_forward(&fwd, optarg)) { | |
444 | add_remote_forward(&options, &fwd); | |
445 | } else { | |
f5a1a01a | 446 | fprintf(stderr, |
3867aa0a | 447 | "Bad remote forwarding specification " |
448 | "'%s'\n", optarg); | |
3aa43b24 | 449 | exit(255); |
5260325f | 450 | } |
5260325f | 451 | break; |
0490e609 | 452 | |
453 | case 'D': | |
3867aa0a | 454 | cp = p = xstrdup(optarg); |
455 | memset(&fwd, '\0', sizeof(fwd)); | |
456 | fwd.connect_host = "socks"; | |
457 | if ((fwd.listen_host = hpdelim(&cp)) == NULL) { | |
458 | fprintf(stderr, "Bad dynamic forwarding " | |
459 | "specification '%.100s'\n", optarg); | |
3aa43b24 | 460 | exit(255); |
3867aa0a | 461 | } |
462 | if (cp != NULL) { | |
463 | fwd.listen_port = a2port(cp); | |
464 | fwd.listen_host = cleanhostname(fwd.listen_host); | |
465 | } else { | |
466 | fwd.listen_port = a2port(fwd.listen_host); | |
7c840747 | 467 | fwd.listen_host = NULL; |
3867aa0a | 468 | } |
469 | ||
470 | if (fwd.listen_port == 0) { | |
f5a1a01a | 471 | fprintf(stderr, "Bad dynamic port '%s'\n", |
472 | optarg); | |
3aa43b24 | 473 | exit(255); |
6031af8d | 474 | } |
3867aa0a | 475 | add_local_forward(&options, &fwd); |
476 | xfree(p); | |
0490e609 | 477 | break; |
478 | ||
5260325f | 479 | case 'C': |
480 | options.compression = 1; | |
481 | break; | |
8ce64345 | 482 | case 'N': |
483 | no_shell_flag = 1; | |
484 | no_tty_flag = 1; | |
485 | break; | |
8ce64345 | 486 | case 'T': |
487 | no_tty_flag = 1; | |
488 | break; | |
5260325f | 489 | case 'o': |
490 | dummy = 1; | |
1aafd17a | 491 | line = xstrdup(optarg); |
f5a1a01a | 492 | if (process_config_line(&options, host ? host : "", |
1aafd17a | 493 | line, "command-line", 0, &dummy) != 0) |
3aa43b24 | 494 | exit(255); |
1aafd17a | 495 | xfree(line); |
5260325f | 496 | break; |
ae810de7 | 497 | case 's': |
498 | subsystem_flag = 1; | |
499 | break; | |
5e96b616 | 500 | case 'S': |
501 | if (options.control_path != NULL) | |
502 | free(options.control_path); | |
503 | options.control_path = xstrdup(optarg); | |
5e96b616 | 504 | break; |
3435f5a6 | 505 | case 'b': |
506 | options.bind_address = optarg; | |
507 | break; | |
e591b98a | 508 | case 'F': |
509 | config = optarg; | |
510 | break; | |
5260325f | 511 | default: |
512 | usage(); | |
513 | } | |
514 | } | |
515 | ||
f5a1a01a | 516 | ac -= optind; |
517 | av += optind; | |
518 | ||
519 | if (ac > 0 && !host && **av != '-') { | |
15748b4d | 520 | if (strrchr(*av, '@')) { |
f5a1a01a | 521 | p = xstrdup(*av); |
15748b4d | 522 | cp = strrchr(p, '@'); |
f5a1a01a | 523 | if (cp == NULL || cp == p) |
524 | usage(); | |
525 | options.user = p; | |
526 | *cp = '\0'; | |
527 | host = ++cp; | |
528 | } else | |
529 | host = *av; | |
978ebf99 | 530 | if (ac > 1) { |
531 | optind = optreset = 1; | |
f5a1a01a | 532 | goto again; |
533 | } | |
978ebf99 | 534 | ac--, av++; |
f5a1a01a | 535 | } |
536 | ||
5260325f | 537 | /* Check that we got a host name. */ |
538 | if (!host) | |
8efc0c15 | 539 | usage(); |
5260325f | 540 | |
22d89d24 | 541 | SSLeay_add_all_algorithms(); |
fa08c86b | 542 | ERR_load_crypto_strings(); |
22d89d24 | 543 | |
5260325f | 544 | /* Initialize the command to execute on remote host. */ |
545 | buffer_init(&command); | |
546 | ||
aa3378df | 547 | /* |
548 | * Save the command to execute on the remote host in a buffer. There | |
549 | * is no limit on the length of the command, except by the maximum | |
550 | * packet size. Also sets the tty flag if there is no command. | |
551 | */ | |
f5a1a01a | 552 | if (!ac) { |
5260325f | 553 | /* No command specified - execute shell on a tty. */ |
554 | tty_flag = 1; | |
ae810de7 | 555 | if (subsystem_flag) { |
f5a1a01a | 556 | fprintf(stderr, |
557 | "You must specify a subsystem to invoke.\n"); | |
ae810de7 | 558 | usage(); |
559 | } | |
5260325f | 560 | } else { |
f5a1a01a | 561 | /* A command has been specified. Store it into the buffer. */ |
562 | for (i = 0; i < ac; i++) { | |
563 | if (i) | |
5260325f | 564 | buffer_append(&command, " ", 1); |
565 | buffer_append(&command, av[i], strlen(av[i])); | |
566 | } | |
8efc0c15 | 567 | } |
5260325f | 568 | |
569 | /* Cannot fork to background if no command. */ | |
14a9a859 | 570 | if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag) |
5260325f | 571 | fatal("Cannot fork into background without a command to execute."); |
572 | ||
573 | /* Allocate a tty by default if no command specified. */ | |
574 | if (buffer_len(&command) == 0) | |
575 | tty_flag = 1; | |
576 | ||
343288b8 | 577 | /* Force no tty */ |
0b6fbf03 | 578 | if (no_tty_flag) |
579 | tty_flag = 0; | |
5260325f | 580 | /* Do not allocate a tty if stdin is not a tty. */ |
7697ac2b | 581 | if ((!isatty(fileno(stdin)) || stdin_null_flag) && !force_tty_flag) { |
5260325f | 582 | if (tty_flag) |
bbe88b6d | 583 | logit("Pseudo-terminal will not be allocated because stdin is not a terminal."); |
5260325f | 584 | tty_flag = 0; |
585 | } | |
8ce64345 | 586 | |
20244695 | 587 | /* |
588 | * Initialize "log" output. Since we are the client all output | |
589 | * actually goes to stderr. | |
590 | */ | |
cc44f691 | 591 | log_init(av[0], options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level, |
592 | SYSLOG_FACILITY_USER, 1); | |
5260325f | 593 | |
e591b98a | 594 | /* |
595 | * Read per-user configuration file. Ignore the system wide config | |
596 | * file if the user specifies a config file on the command line. | |
597 | */ | |
598 | if (config != NULL) { | |
f7f14143 | 599 | if (!read_config_file(config, host, &options, 0)) |
93111dfa | 600 | fatal("Can't open user config file %.100s: " |
601 | "%.100s", config, strerror(errno)); | |
e591b98a | 602 | } else { |
603 | snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, | |
604 | _PATH_SSH_USER_CONFFILE); | |
9f6cab4b | 605 | (void)read_config_file(buf, host, &options, 1); |
e591b98a | 606 | |
f67792f2 | 607 | /* Read systemwide configuration file after use config. */ |
f2107e97 | 608 | (void)read_config_file(_PATH_HOST_CONFIG_FILE, host, |
9f6cab4b | 609 | &options, 0); |
e591b98a | 610 | } |
5260325f | 611 | |
612 | /* Fill configuration defaults. */ | |
613 | fill_default_options(&options); | |
614 | ||
1572b90f | 615 | channel_set_af(options.address_family); |
616 | ||
5260325f | 617 | /* reinit */ |
20244695 | 618 | log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 1); |
5260325f | 619 | |
e339aa53 | 620 | seed_rng(); |
621 | ||
5260325f | 622 | if (options.user == NULL) |
623 | options.user = xstrdup(pw->pw_name); | |
624 | ||
625 | if (options.hostname != NULL) | |
626 | host = options.hostname; | |
627 | ||
03c82656 | 628 | /* force lowercase for hostkey matching */ |
629 | if (options.host_key_alias != NULL) { | |
630 | for (p = options.host_key_alias; *p; p++) | |
631 | if (isupper(*p)) | |
9555d258 | 632 | *p = (char)tolower(*p); |
03c82656 | 633 | } |
634 | ||
de574442 | 635 | /* Get default port if port has not been set. */ |
636 | if (options.port == 0) { | |
637 | sp = getservbyname(SSH_SERVICE_NAME, "tcp"); | |
638 | options.port = sp ? ntohs(sp->s_port) : SSH_DEFAULT_PORT; | |
639 | } | |
640 | ||
f78bde70 | 641 | if (options.proxy_command != NULL && |
642 | strcmp(options.proxy_command, "none") == 0) | |
643 | options.proxy_command = NULL; | |
699255b5 | 644 | if (options.control_path != NULL && |
645 | strcmp(options.control_path, "none") == 0) | |
646 | options.control_path = NULL; | |
f78bde70 | 647 | |
5e96b616 | 648 | if (options.control_path != NULL) { |
f7b8224d | 649 | char me[NI_MAXHOST]; |
650 | ||
651 | if (gethostname(me, sizeof(me)) == -1) | |
652 | fatal("gethostname: %s", strerror(errno)); | |
a980cbd7 | 653 | snprintf(buf, sizeof(buf), "%d", options.port); |
654 | cp = tilde_expand_filename(options.control_path, | |
655 | original_real_uid); | |
656 | options.control_path = percent_expand(cp, "p", buf, "h", host, | |
f7b8224d | 657 | "r", options.user, "l", me, (char *)NULL); |
a980cbd7 | 658 | xfree(cp); |
5e96b616 | 659 | } |
19186c3d | 660 | if (mux_command != 0 && options.control_path == NULL) |
661 | fatal("No ControlPath specified for \"-O\" command"); | |
9dfd96d6 | 662 | if (options.control_path != NULL) |
cc8ca1e6 | 663 | control_client(options.control_path); |
5e96b616 | 664 | |
6ffc9c88 | 665 | /* Open a connection to the remote host. */ |
1572b90f | 666 | if (ssh_connect(host, &hostaddr, options.port, |
667 | options.address_family, options.connection_attempts, | |
d514c907 | 668 | #ifdef HAVE_CYGWIN |
669 | options.use_privileged_port, | |
670 | #else | |
3fb156df | 671 | original_effective_uid == 0 && options.use_privileged_port, |
d514c907 | 672 | #endif |
de60473e | 673 | options.proxy_command) != 0) |
3aa43b24 | 674 | exit(255); |
5260325f | 675 | |
aa3378df | 676 | /* |
677 | * If we successfully made the connection, load the host private key | |
678 | * in case we will need it later for combined rsa-rhosts | |
679 | * authentication. This must be done before releasing extra | |
680 | * privileges, because the file is only readable by root. | |
78660ed4 | 681 | * If we cannot access the private keys, load the public keys |
682 | * instead and try to execute the ssh-keysign helper instead. | |
aa3378df | 683 | */ |
8002af61 | 684 | sensitive_data.nkeys = 0; |
685 | sensitive_data.keys = NULL; | |
39c00dc2 | 686 | sensitive_data.external_keysign = 0; |
b34bec32 | 687 | if (options.rhosts_rsa_authentication || |
688 | options.hostbased_authentication) { | |
8002af61 | 689 | sensitive_data.nkeys = 3; |
52e3daed | 690 | sensitive_data.keys = xcalloc(sensitive_data.nkeys, |
343288b8 | 691 | sizeof(Key)); |
3fb156df | 692 | |
693 | PRIV_START; | |
8002af61 | 694 | sensitive_data.keys[0] = key_load_private_type(KEY_RSA1, |
aeaa3d9e | 695 | _PATH_HOST_KEY_FILE, "", NULL); |
8002af61 | 696 | sensitive_data.keys[1] = key_load_private_type(KEY_DSA, |
697 | _PATH_HOST_DSA_KEY_FILE, "", NULL); | |
698 | sensitive_data.keys[2] = key_load_private_type(KEY_RSA, | |
699 | _PATH_HOST_RSA_KEY_FILE, "", NULL); | |
3fb156df | 700 | PRIV_END; |
39c00dc2 | 701 | |
60cd0a97 | 702 | if (options.hostbased_authentication == 1 && |
703 | sensitive_data.keys[0] == NULL && | |
39c00dc2 | 704 | sensitive_data.keys[1] == NULL && |
705 | sensitive_data.keys[2] == NULL) { | |
706 | sensitive_data.keys[1] = key_load_public( | |
707 | _PATH_HOST_DSA_KEY_FILE, NULL); | |
708 | sensitive_data.keys[2] = key_load_public( | |
709 | _PATH_HOST_RSA_KEY_FILE, NULL); | |
710 | sensitive_data.external_keysign = 1; | |
711 | } | |
5260325f | 712 | } |
aa3378df | 713 | /* |
714 | * Get rid of any extra privileges that we may have. We will no | |
715 | * longer need them. Also, extra privileges could make it very hard | |
716 | * to read identity files and other non-world-readable files from the | |
717 | * user's home directory if it happens to be on a NFS volume where | |
718 | * root is mapped to nobody. | |
719 | */ | |
6213295d | 720 | if (original_effective_uid == 0) { |
721 | PRIV_START; | |
722 | permanently_set_uid(pw); | |
723 | } | |
5260325f | 724 | |
aa3378df | 725 | /* |
726 | * Now that we are back to our own permissions, create ~/.ssh | |
7b9b0103 | 727 | * directory if it doesn't already exist. |
aa3378df | 728 | */ |
c3abff07 | 729 | snprintf(buf, sizeof buf, "%.100s%s%.100s", pw->pw_dir, strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR); |
5260325f | 730 | if (stat(buf, &st) < 0) |
704b1659 | 731 | if (mkdir(buf, 0700) < 0) |
5260325f | 732 | error("Could not create directory '%.200s'.", buf); |
733 | ||
fee56204 | 734 | /* load options.identity_files */ |
735 | load_public_identity_files(); | |
736 | ||
737 | /* Expand ~ in known host file names. */ | |
738 | /* XXX mem-leaks: */ | |
fa08c86b | 739 | options.system_hostfile = |
740 | tilde_expand_filename(options.system_hostfile, original_real_uid); | |
741 | options.user_hostfile = | |
742 | tilde_expand_filename(options.user_hostfile, original_real_uid); | |
743 | options.system_hostfile2 = | |
744 | tilde_expand_filename(options.system_hostfile2, original_real_uid); | |
745 | options.user_hostfile2 = | |
746 | tilde_expand_filename(options.user_hostfile2, original_real_uid); | |
5260325f | 747 | |
67b75437 | 748 | signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */ |
749 | ||
5260325f | 750 | /* Log into the remote system. This never returns if the login fails. */ |
39c00dc2 | 751 | ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr, pw); |
8002af61 | 752 | |
753 | /* We no longer need the private host keys. Clear them now. */ | |
754 | if (sensitive_data.nkeys != 0) { | |
755 | for (i = 0; i < sensitive_data.nkeys; i++) { | |
756 | if (sensitive_data.keys[i] != NULL) { | |
757 | /* Destroys contents safely */ | |
758 | debug3("clear hostkey %d", i); | |
759 | key_free(sensitive_data.keys[i]); | |
760 | sensitive_data.keys[i] = NULL; | |
761 | } | |
762 | } | |
763 | xfree(sensitive_data.keys); | |
764 | } | |
05b7537a | 765 | for (i = 0; i < options.num_identity_files; i++) { |
766 | if (options.identity_files[i]) { | |
767 | xfree(options.identity_files[i]); | |
768 | options.identity_files[i] = NULL; | |
769 | } | |
770 | if (options.identity_keys[i]) { | |
771 | key_free(options.identity_keys[i]); | |
772 | options.identity_keys[i] = NULL; | |
773 | } | |
774 | } | |
5260325f | 775 | |
8ce64345 | 776 | exit_status = compat20 ? ssh_session2() : ssh_session(); |
777 | packet_close(); | |
6939bbd4 | 778 | |
5e96b616 | 779 | if (options.control_path != NULL && control_fd != -1) |
780 | unlink(options.control_path); | |
781 | ||
6939bbd4 | 782 | /* |
aff51935 | 783 | * Send SIGHUP to proxy command if used. We don't wait() in |
6939bbd4 | 784 | * case it hangs and instead rely on init to reap the child |
785 | */ | |
786 | if (proxy_command_pid > 1) | |
787 | kill(proxy_command_pid, SIGHUP); | |
788 | ||
8ce64345 | 789 | return exit_status; |
790 | } | |
791 | ||
396c147e | 792 | static void |
fa08c86b | 793 | ssh_init_forwarding(void) |
794 | { | |
02a024dd | 795 | int success = 0; |
fa08c86b | 796 | int i; |
02a024dd | 797 | |
fa08c86b | 798 | /* Initiate local TCP/IP port forwardings. */ |
799 | for (i = 0; i < options.num_local_forwards; i++) { | |
3867aa0a | 800 | debug("Local connections to %.200s:%d forwarded to remote " |
801 | "address %.200s:%d", | |
f8cc7664 | 802 | (options.local_forwards[i].listen_host == NULL) ? |
803 | (options.gateway_ports ? "*" : "LOCALHOST") : | |
3867aa0a | 804 | options.local_forwards[i].listen_host, |
805 | options.local_forwards[i].listen_port, | |
806 | options.local_forwards[i].connect_host, | |
807 | options.local_forwards[i].connect_port); | |
5641aefa | 808 | success += channel_setup_local_fwd_listener( |
3867aa0a | 809 | options.local_forwards[i].listen_host, |
810 | options.local_forwards[i].listen_port, | |
811 | options.local_forwards[i].connect_host, | |
812 | options.local_forwards[i].connect_port, | |
fa08c86b | 813 | options.gateway_ports); |
814 | } | |
02a024dd | 815 | if (i > 0 && success == 0) |
816 | error("Could not request local forwarding."); | |
fa08c86b | 817 | |
818 | /* Initiate remote TCP/IP port forwardings. */ | |
819 | for (i = 0; i < options.num_remote_forwards; i++) { | |
3867aa0a | 820 | debug("Remote connections from %.200s:%d forwarded to " |
821 | "local address %.200s:%d", | |
56964485 | 822 | (options.remote_forwards[i].listen_host == NULL) ? |
aa9bc1de | 823 | "LOCALHOST" : options.remote_forwards[i].listen_host, |
3867aa0a | 824 | options.remote_forwards[i].listen_port, |
825 | options.remote_forwards[i].connect_host, | |
826 | options.remote_forwards[i].connect_port); | |
fa08c86b | 827 | channel_request_remote_forwarding( |
3867aa0a | 828 | options.remote_forwards[i].listen_host, |
829 | options.remote_forwards[i].listen_port, | |
830 | options.remote_forwards[i].connect_host, | |
831 | options.remote_forwards[i].connect_port); | |
fa08c86b | 832 | } |
833 | } | |
834 | ||
396c147e | 835 | static void |
fa08c86b | 836 | check_agent_present(void) |
837 | { | |
838 | if (options.forward_agent) { | |
7b9b0103 | 839 | /* Clear agent forwarding if we don't have an agent. */ |
8b10e20e | 840 | if (!ssh_agent_present()) |
fa08c86b | 841 | options.forward_agent = 0; |
fa08c86b | 842 | } |
843 | } | |
844 | ||
396c147e | 845 | static int |
8ce64345 | 846 | ssh_session(void) |
847 | { | |
848 | int type; | |
8ce64345 | 849 | int interactive = 0; |
850 | int have_tty = 0; | |
851 | struct winsize ws; | |
8ce64345 | 852 | char *cp; |
9bf083eb | 853 | const char *display; |
8ce64345 | 854 | |
5260325f | 855 | /* Enable compression if requested. */ |
856 | if (options.compression) { | |
857 | debug("Requesting compression at level %d.", options.compression_level); | |
858 | ||
859 | if (options.compression_level < 1 || options.compression_level > 9) | |
860 | fatal("Compression level must be from 1 (fast) to 9 (slow, best)."); | |
861 | ||
862 | /* Send the request. */ | |
863 | packet_start(SSH_CMSG_REQUEST_COMPRESSION); | |
864 | packet_put_int(options.compression_level); | |
865 | packet_send(); | |
866 | packet_write_wait(); | |
54a5250f | 867 | type = packet_read(); |
5260325f | 868 | if (type == SSH_SMSG_SUCCESS) |
869 | packet_start_compression(options.compression_level); | |
870 | else if (type == SSH_SMSG_FAILURE) | |
bbe88b6d | 871 | logit("Warning: Remote host refused compression."); |
5260325f | 872 | else |
873 | packet_disconnect("Protocol error waiting for compression response."); | |
874 | } | |
875 | /* Allocate a pseudo tty if appropriate. */ | |
876 | if (tty_flag) { | |
877 | debug("Requesting pty."); | |
878 | ||
879 | /* Start the packet. */ | |
880 | packet_start(SSH_CMSG_REQUEST_PTY); | |
881 | ||
882 | /* Store TERM in the packet. There is no limit on the | |
883 | length of the string. */ | |
884 | cp = getenv("TERM"); | |
885 | if (!cp) | |
886 | cp = ""; | |
449c5ba5 | 887 | packet_put_cstring(cp); |
5260325f | 888 | |
889 | /* Store window size in the packet. */ | |
890 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) | |
891 | memset(&ws, 0, sizeof(ws)); | |
148de80c | 892 | packet_put_int((u_int)ws.ws_row); |
893 | packet_put_int((u_int)ws.ws_col); | |
894 | packet_put_int((u_int)ws.ws_xpixel); | |
895 | packet_put_int((u_int)ws.ws_ypixel); | |
5260325f | 896 | |
897 | /* Store tty modes in the packet. */ | |
30dcc918 | 898 | tty_make_modes(fileno(stdin), NULL); |
5260325f | 899 | |
900 | /* Send the packet, and wait for it to leave. */ | |
901 | packet_send(); | |
902 | packet_write_wait(); | |
903 | ||
904 | /* Read response from the server. */ | |
54a5250f | 905 | type = packet_read(); |
4fe2af09 | 906 | if (type == SSH_SMSG_SUCCESS) { |
5260325f | 907 | interactive = 1; |
8ce64345 | 908 | have_tty = 1; |
4fe2af09 | 909 | } else if (type == SSH_SMSG_FAILURE) |
bbe88b6d | 910 | logit("Warning: Remote host failed or refused to allocate a pseudo tty."); |
5260325f | 911 | else |
912 | packet_disconnect("Protocol error waiting for pty request response."); | |
913 | } | |
914 | /* Request X11 forwarding if enabled and DISPLAY is set. */ | |
9bf083eb | 915 | display = getenv("DISPLAY"); |
916 | if (options.forward_x11 && display != NULL) { | |
b48eeb07 | 917 | char *proto, *data; |
0b242b12 | 918 | /* Get reasonable local authentication information. */ |
9bf083eb | 919 | client_x11_get_proto(display, options.xauth_location, |
920 | options.forward_x11_trusted, &proto, &data); | |
0b242b12 | 921 | /* Request forwarding with authentication spoofing. */ |
5260325f | 922 | debug("Requesting X11 forwarding with authentication spoofing."); |
9bf083eb | 923 | x11_request_forwarding_with_spoofing(0, display, proto, data); |
5260325f | 924 | |
925 | /* Read response from the server. */ | |
54a5250f | 926 | type = packet_read(); |
5260325f | 927 | if (type == SSH_SMSG_SUCCESS) { |
5260325f | 928 | interactive = 1; |
0b242b12 | 929 | } else if (type == SSH_SMSG_FAILURE) { |
bbe88b6d | 930 | logit("Warning: Remote host denied X11 forwarding."); |
0b242b12 | 931 | } else { |
5260325f | 932 | packet_disconnect("Protocol error waiting for X11 forwarding"); |
0b242b12 | 933 | } |
5260325f | 934 | } |
935 | /* Tell the packet module whether this is an interactive session. */ | |
b5c334cc | 936 | packet_set_interactive(interactive); |
5260325f | 937 | |
938 | /* Request authentication agent forwarding if appropriate. */ | |
fa08c86b | 939 | check_agent_present(); |
940 | ||
5260325f | 941 | if (options.forward_agent) { |
942 | debug("Requesting authentication agent forwarding."); | |
943 | auth_request_forwarding(); | |
944 | ||
945 | /* Read response from the server. */ | |
54a5250f | 946 | type = packet_read(); |
95500969 | 947 | packet_check_eom(); |
5260325f | 948 | if (type != SSH_SMSG_SUCCESS) |
bbe88b6d | 949 | logit("Warning: Remote host denied authentication agent forwarding."); |
5260325f | 950 | } |
8efc0c15 | 951 | |
fa08c86b | 952 | /* Initiate port forwardings. */ |
953 | ssh_init_forwarding(); | |
5260325f | 954 | |
aa3378df | 955 | /* If requested, let ssh continue in the background. */ |
6ae2364d | 956 | if (fork_after_authentication_flag) |
aa3378df | 957 | if (daemon(1, 1) < 0) |
958 | fatal("daemon() failed: %.200s", strerror(errno)); | |
959 | ||
960 | /* | |
961 | * If a command was specified on the command line, execute the | |
962 | * command now. Otherwise request the server to start a shell. | |
963 | */ | |
5260325f | 964 | if (buffer_len(&command) > 0) { |
965 | int len = buffer_len(&command); | |
966 | if (len > 900) | |
967 | len = 900; | |
6c0fa2b1 | 968 | debug("Sending command: %.*s", len, (u_char *)buffer_ptr(&command)); |
5260325f | 969 | packet_start(SSH_CMSG_EXEC_CMD); |
970 | packet_put_string(buffer_ptr(&command), buffer_len(&command)); | |
971 | packet_send(); | |
972 | packet_write_wait(); | |
973 | } else { | |
974 | debug("Requesting shell."); | |
975 | packet_start(SSH_CMSG_EXEC_SHELL); | |
976 | packet_send(); | |
977 | packet_write_wait(); | |
978 | } | |
979 | ||
980 | /* Enter the interactive session. */ | |
4bf9c10e | 981 | return client_loop(have_tty, tty_flag ? |
982 | options.escape_char : SSH_ESCAPECHAR_NONE, 0); | |
8ce64345 | 983 | } |
5260325f | 984 | |
396c147e | 985 | static void |
5e96b616 | 986 | ssh_subsystem_reply(int type, u_int32_t seq, void *ctxt) |
1f3bf5aa | 987 | { |
988 | int id, len; | |
989 | ||
990 | id = packet_get_int(); | |
991 | len = buffer_len(&command); | |
ce91d6f8 | 992 | if (len > 900) |
993 | len = 900; | |
95500969 | 994 | packet_check_eom(); |
1f3bf5aa | 995 | if (type == SSH2_MSG_CHANNEL_FAILURE) |
996 | fatal("Request for subsystem '%.*s' failed on channel %d", | |
6c0fa2b1 | 997 | len, (u_char *)buffer_ptr(&command), id); |
1f3bf5aa | 998 | } |
999 | ||
e0ae8728 | 1000 | void |
5d8d32a3 | 1001 | client_global_request_reply_fwd(int type, u_int32_t seq, void *ctxt) |
e0ae8728 | 1002 | { |
1003 | int i; | |
1004 | ||
1005 | i = client_global_request_id++; | |
5d8d32a3 | 1006 | if (i >= options.num_remote_forwards) |
e0ae8728 | 1007 | return; |
e0ae8728 | 1008 | debug("remote forward %s for: listen %d, connect %s:%d", |
1009 | type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure", | |
3867aa0a | 1010 | options.remote_forwards[i].listen_port, |
1011 | options.remote_forwards[i].connect_host, | |
1012 | options.remote_forwards[i].connect_port); | |
e0ae8728 | 1013 | if (type == SSH2_MSG_REQUEST_FAILURE) |
3867aa0a | 1014 | logit("Warning: remote port forwarding failed for listen " |
1015 | "port %d", options.remote_forwards[i].listen_port); | |
e0ae8728 | 1016 | } |
1017 | ||
396c147e | 1018 | static void |
5e96b616 | 1019 | ssh_control_listener(void) |
8ce64345 | 1020 | { |
5e96b616 | 1021 | struct sockaddr_un addr; |
1022 | mode_t old_umask; | |
4b5df124 | 1023 | int addr_len; |
1024 | ||
9dfd96d6 | 1025 | if (options.control_path == NULL || |
1026 | options.control_master == SSHCTL_MASTER_NO) | |
5e96b616 | 1027 | return; |
b5c334cc | 1028 | |
9dfd96d6 | 1029 | debug("setting up multiplex master socket"); |
1030 | ||
5e96b616 | 1031 | memset(&addr, '\0', sizeof(addr)); |
1032 | addr.sun_family = AF_UNIX; | |
4b5df124 | 1033 | addr_len = offsetof(struct sockaddr_un, sun_path) + |
5e96b616 | 1034 | strlen(options.control_path) + 1; |
8ce64345 | 1035 | |
5e96b616 | 1036 | if (strlcpy(addr.sun_path, options.control_path, |
1037 | sizeof(addr.sun_path)) >= sizeof(addr.sun_path)) | |
1038 | fatal("ControlPath too long"); | |
8ce64345 | 1039 | |
5e96b616 | 1040 | if ((control_fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) |
17318dd6 | 1041 | fatal("%s socket(): %s", __func__, strerror(errno)); |
5e96b616 | 1042 | |
1043 | old_umask = umask(0177); | |
32596c7b | 1044 | if (bind(control_fd, (struct sockaddr *)&addr, addr_len) == -1) { |
5e96b616 | 1045 | control_fd = -1; |
05ada1a6 | 1046 | if (errno == EINVAL || errno == EADDRINUSE) |
5e96b616 | 1047 | fatal("ControlSocket %s already exists", |
1048 | options.control_path); | |
1049 | else | |
17318dd6 | 1050 | fatal("%s bind(): %s", __func__, strerror(errno)); |
8ce64345 | 1051 | } |
5e96b616 | 1052 | umask(old_umask); |
1053 | ||
1054 | if (listen(control_fd, 64) == -1) | |
17318dd6 | 1055 | fatal("%s listen(): %s", __func__, strerror(errno)); |
5e96b616 | 1056 | |
1057 | set_nonblock(control_fd); | |
1058 | } | |
1059 | ||
1060 | /* request pty/x11/agent/tcpfwd/shell for channel */ | |
1061 | static void | |
1062 | ssh_session2_setup(int id, void *arg) | |
1063 | { | |
1786be35 | 1064 | extern char **environ; |
9bf083eb | 1065 | const char *display; |
5e96b616 | 1066 | int interactive = tty_flag; |
9bf083eb | 1067 | |
56964485 | 1068 | display = getenv("DISPLAY"); |
9bf083eb | 1069 | if (options.forward_x11 && display != NULL) { |
b48eeb07 | 1070 | char *proto, *data; |
0b242b12 | 1071 | /* Get reasonable local authentication information. */ |
9bf083eb | 1072 | client_x11_get_proto(display, options.xauth_location, |
1073 | options.forward_x11_trusted, &proto, &data); | |
0b242b12 | 1074 | /* Request forwarding with authentication spoofing. */ |
1075 | debug("Requesting X11 forwarding with authentication spoofing."); | |
9bf083eb | 1076 | x11_request_forwarding_with_spoofing(id, display, proto, data); |
b5c334cc | 1077 | interactive = 1; |
0b242b12 | 1078 | /* XXX wait for reply */ |
1079 | } | |
1080 | ||
fa08c86b | 1081 | check_agent_present(); |
1082 | if (options.forward_agent) { | |
1083 | debug("Requesting authentication agent forwarding."); | |
1084 | channel_request_start(id, "auth-agent-req@openssh.com", 0); | |
1085 | packet_send(); | |
1086 | } | |
1087 | ||
a4f24bf8 | 1088 | if (options.tun_open != SSH_TUNMODE_NO) { |
d20f3c9e | 1089 | Channel *c; |
1090 | int fd; | |
1091 | ||
1092 | debug("Requesting tun."); | |
a4f24bf8 | 1093 | if ((fd = tun_open(options.tun_local, |
1094 | options.tun_open)) >= 0) { | |
d20f3c9e | 1095 | c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1, |
1096 | CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, | |
1097 | 0, "tun", 1); | |
1098 | c->datagram = 1; | |
e914f53a | 1099 | #if defined(SSH_TUN_FILTER) |
1100 | if (options.tun_open == SSH_TUNMODE_POINTOPOINT) | |
1101 | channel_register_filter(c->self, sys_tun_infilter, | |
1102 | sys_tun_outfilter); | |
1103 | #endif | |
d20f3c9e | 1104 | packet_start(SSH2_MSG_CHANNEL_OPEN); |
1105 | packet_put_cstring("tun@openssh.com"); | |
1106 | packet_put_int(c->self); | |
1107 | packet_put_int(c->local_window_max); | |
1108 | packet_put_int(c->local_maxpacket); | |
a4f24bf8 | 1109 | packet_put_int(options.tun_open); |
d20f3c9e | 1110 | packet_put_int(options.tun_remote); |
1111 | packet_send(); | |
1112 | } | |
1113 | } | |
1114 | ||
5e96b616 | 1115 | client_session2_setup(id, tty_flag, subsystem_flag, getenv("TERM"), |
1786be35 | 1116 | NULL, fileno(stdin), &command, environ, &ssh_subsystem_reply); |
1f3bf5aa | 1117 | |
b5c334cc | 1118 | packet_set_interactive(interactive); |
8ce64345 | 1119 | } |
1120 | ||
bcdb96c2 | 1121 | /* open new channel for a session */ |
396c147e | 1122 | static int |
bcdb96c2 | 1123 | ssh_session2_open(void) |
8ce64345 | 1124 | { |
719fc62f | 1125 | Channel *c; |
1126 | int window, packetmax, in, out, err; | |
2e73a022 | 1127 | |
14a9a859 | 1128 | if (stdin_null_flag) { |
5ca51e19 | 1129 | in = open(_PATH_DEVNULL, O_RDONLY); |
14a9a859 | 1130 | } else { |
1131 | in = dup(STDIN_FILENO); | |
1132 | } | |
2e73a022 | 1133 | out = dup(STDOUT_FILENO); |
1134 | err = dup(STDERR_FILENO); | |
8ce64345 | 1135 | |
1136 | if (in < 0 || out < 0 || err < 0) | |
14a9a859 | 1137 | fatal("dup() in/out/err failed"); |
8ce64345 | 1138 | |
a22aff1f | 1139 | /* enable nonblocking unless tty */ |
1140 | if (!isatty(in)) | |
1141 | set_nonblock(in); | |
1142 | if (!isatty(out)) | |
1143 | set_nonblock(out); | |
1144 | if (!isatty(err)) | |
1145 | set_nonblock(err); | |
1146 | ||
bcbf86ec | 1147 | window = CHAN_SES_WINDOW_DEFAULT; |
1148 | packetmax = CHAN_SES_PACKET_DEFAULT; | |
ea9700ba | 1149 | if (tty_flag) { |
1150 | window >>= 1; | |
1151 | packetmax >>= 1; | |
8ce64345 | 1152 | } |
719fc62f | 1153 | c = channel_new( |
8ce64345 | 1154 | "session", SSH_CHANNEL_OPENING, in, out, err, |
bcbf86ec | 1155 | window, packetmax, CHAN_EXTENDED_WRITE, |
0d942eff | 1156 | "client-session", /*nonblock*/0); |
8ce64345 | 1157 | |
bcdb96c2 | 1158 | debug3("ssh_session2_open: channel_new: %d", c->self); |
eb0dd41f | 1159 | |
36e1f6a1 | 1160 | channel_send_open(c->self); |
bcdb96c2 | 1161 | if (!no_shell_flag) |
5e96b616 | 1162 | channel_register_confirm(c->self, ssh_session2_setup, NULL); |
5260325f | 1163 | |
719fc62f | 1164 | return c->self; |
eb0dd41f | 1165 | } |
1166 | ||
396c147e | 1167 | static int |
eb0dd41f | 1168 | ssh_session2(void) |
1169 | { | |
bcdb96c2 | 1170 | int id = -1; |
eb0dd41f | 1171 | |
1172 | /* XXX should be pre-session */ | |
1173 | ssh_init_forwarding(); | |
5e96b616 | 1174 | ssh_control_listener(); |
eb0dd41f | 1175 | |
bcdb96c2 | 1176 | if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN)) |
1177 | id = ssh_session2_open(); | |
eb0dd41f | 1178 | |
d20f3c9e | 1179 | /* Execute a local command */ |
1180 | if (options.local_command != NULL && | |
1181 | options.permit_local_command) | |
1182 | ssh_local_cmd(options.local_command); | |
1183 | ||
eb0dd41f | 1184 | /* If requested, let ssh continue in the background. */ |
1185 | if (fork_after_authentication_flag) | |
1186 | if (daemon(1, 1) < 0) | |
1187 | fatal("daemon() failed: %.200s", strerror(errno)); | |
1188 | ||
4bf9c10e | 1189 | return client_loop(tty_flag, tty_flag ? |
1190 | options.escape_char : SSH_ESCAPECHAR_NONE, id); | |
8efc0c15 | 1191 | } |
fa08c86b | 1192 | |
396c147e | 1193 | static void |
fee56204 | 1194 | load_public_identity_files(void) |
1195 | { | |
1196 | char *filename; | |
2e23cde0 | 1197 | int i = 0; |
0659cace | 1198 | Key *public; |
383546c4 | 1199 | #ifdef SMARTCARD |
0659cace | 1200 | Key **keys; |
1201 | ||
9ff6f66f | 1202 | if (options.smartcard_device != NULL && |
0659cace | 1203 | options.num_identity_files < SSH_MAX_IDENTITY_FILES && |
1204 | (keys = sc_get_keys(options.smartcard_device, NULL)) != NULL ) { | |
1205 | int count = 0; | |
1206 | for (i = 0; keys[i] != NULL; i++) { | |
1207 | count++; | |
0659cace | 1208 | memmove(&options.identity_files[1], &options.identity_files[0], |
1209 | sizeof(char *) * (SSH_MAX_IDENTITY_FILES - 1)); | |
1210 | memmove(&options.identity_keys[1], &options.identity_keys[0], | |
1211 | sizeof(Key *) * (SSH_MAX_IDENTITY_FILES - 1)); | |
1212 | options.num_identity_files++; | |
1213 | options.identity_keys[0] = keys[i]; | |
244e796f | 1214 | options.identity_files[0] = sc_get_key_label(keys[i]); |
0659cace | 1215 | } |
1c2deed1 | 1216 | if (options.num_identity_files > SSH_MAX_IDENTITY_FILES) |
1217 | options.num_identity_files = SSH_MAX_IDENTITY_FILES; | |
0659cace | 1218 | i = count; |
1219 | xfree(keys); | |
383546c4 | 1220 | } |
3e984472 | 1221 | #endif /* SMARTCARD */ |
2e23cde0 | 1222 | for (; i < options.num_identity_files; i++) { |
1223 | filename = tilde_expand_filename(options.identity_files[i], | |
1224 | original_real_uid); | |
1225 | public = key_load_public(filename, NULL); | |
1226 | debug("identity file %s type %d", filename, | |
1227 | public ? public->type : -1); | |
1228 | xfree(options.identity_files[i]); | |
1229 | options.identity_files[i] = filename; | |
1230 | options.identity_keys[i] = public; | |
1231 | } | |
fee56204 | 1232 | } |
5e96b616 | 1233 | |
1234 | static void | |
1235 | control_client_sighandler(int signo) | |
1236 | { | |
1237 | control_client_terminate = signo; | |
1238 | } | |
1239 | ||
1240 | static void | |
1241 | control_client_sigrelay(int signo) | |
1242 | { | |
1243 | if (control_server_pid > 1) | |
1244 | kill(control_server_pid, signo); | |
1245 | } | |
1246 | ||
67a08279 | 1247 | static int |
1248 | env_permitted(char *env) | |
1249 | { | |
1250 | int i; | |
1251 | char name[1024], *cp; | |
1252 | ||
52e3daed | 1253 | if (strlcpy(name, env, sizeof(name)) >= sizeof(name)) |
1254 | fatal("env_permitted: name too long"); | |
67a08279 | 1255 | if ((cp = strchr(name, '=')) == NULL) |
1256 | return (0); | |
1257 | ||
1258 | *cp = '\0'; | |
1259 | ||
1260 | for (i = 0; i < options.num_send_env; i++) | |
1261 | if (match_pattern(name, options.send_env[i])) | |
1262 | return (1); | |
1263 | ||
1264 | return (0); | |
1265 | } | |
1266 | ||
5e96b616 | 1267 | static void |
1268 | control_client(const char *path) | |
1269 | { | |
1270 | struct sockaddr_un addr; | |
a7e124fe | 1271 | int i, r, fd, sock, exitval, num_env, addr_len; |
5e96b616 | 1272 | Buffer m; |
f8c6db83 | 1273 | char *term; |
1786be35 | 1274 | extern char **environ; |
f8c6db83 | 1275 | u_int flags; |
f2107e97 | 1276 | |
9dfd96d6 | 1277 | if (mux_command == 0) |
1278 | mux_command = SSHMUX_COMMAND_OPEN; | |
1279 | ||
1280 | switch (options.control_master) { | |
1281 | case SSHCTL_MASTER_AUTO: | |
1282 | case SSHCTL_MASTER_AUTO_ASK: | |
1283 | debug("auto-mux: Trying existing master"); | |
1284 | /* FALLTHROUGH */ | |
1285 | case SSHCTL_MASTER_NO: | |
1286 | break; | |
1287 | default: | |
1288 | return; | |
1289 | } | |
1290 | ||
5e96b616 | 1291 | memset(&addr, '\0', sizeof(addr)); |
1292 | addr.sun_family = AF_UNIX; | |
4b5df124 | 1293 | addr_len = offsetof(struct sockaddr_un, sun_path) + |
5e96b616 | 1294 | strlen(path) + 1; |
1295 | ||
1296 | if (strlcpy(addr.sun_path, path, | |
1297 | sizeof(addr.sun_path)) >= sizeof(addr.sun_path)) | |
1298 | fatal("ControlPath too long"); | |
1299 | ||
1300 | if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) | |
1301 | fatal("%s socket(): %s", __func__, strerror(errno)); | |
1302 | ||
32596c7b | 1303 | if (connect(sock, (struct sockaddr *)&addr, addr_len) == -1) { |
19186c3d | 1304 | if (mux_command != SSHMUX_COMMAND_OPEN) { |
1305 | fatal("Control socket connect(%.100s): %s", path, | |
1306 | strerror(errno)); | |
1307 | } | |
f6740270 | 1308 | if (errno == ENOENT) |
7de98c39 | 1309 | debug("Control socket \"%.100s\" does not exist", path); |
f6740270 | 1310 | else { |
7de98c39 | 1311 | error("Control socket connect(%.100s): %s", path, |
f6740270 | 1312 | strerror(errno)); |
1313 | } | |
7de98c39 | 1314 | close(sock); |
1315 | return; | |
1316 | } | |
1317 | ||
1318 | if (stdin_null_flag) { | |
1319 | if ((fd = open(_PATH_DEVNULL, O_RDONLY)) == -1) | |
1320 | fatal("open(/dev/null): %s", strerror(errno)); | |
1321 | if (dup2(fd, STDIN_FILENO) == -1) | |
1322 | fatal("dup2: %s", strerror(errno)); | |
1323 | if (fd > STDERR_FILENO) | |
1324 | close(fd); | |
1325 | } | |
56964485 | 1326 | |
ef07103c | 1327 | term = getenv("TERM"); |
f8c6db83 | 1328 | |
1329 | flags = 0; | |
1330 | if (tty_flag) | |
1331 | flags |= SSHMUX_FLAG_TTY; | |
1332 | if (subsystem_flag) | |
1333 | flags |= SSHMUX_FLAG_SUBSYS; | |
ef07103c | 1334 | if (options.forward_x11) |
1335 | flags |= SSHMUX_FLAG_X11_FWD; | |
1336 | if (options.forward_agent) | |
1337 | flags |= SSHMUX_FLAG_AGENT_FWD; | |
5e96b616 | 1338 | |
5e96b616 | 1339 | buffer_init(&m); |
1340 | ||
f8c6db83 | 1341 | /* Send our command to server */ |
1342 | buffer_put_int(&m, mux_command); | |
1343 | buffer_put_int(&m, flags); | |
ef07103c | 1344 | if (ssh_msg_send(sock, SSHMUX_VER, &m) == -1) |
f8c6db83 | 1345 | fatal("%s: msg_send", __func__); |
1346 | buffer_clear(&m); | |
1347 | ||
1348 | /* Get authorisation status and PID of controlee */ | |
5e96b616 | 1349 | if (ssh_msg_recv(sock, &m) == -1) |
1350 | fatal("%s: msg_recv", __func__); | |
ef07103c | 1351 | if (buffer_get_char(&m) != SSHMUX_VER) |
5e96b616 | 1352 | fatal("%s: wrong version", __func__); |
0d34d6ce | 1353 | if (buffer_get_int(&m) != 1) |
1354 | fatal("Connection to master denied"); | |
5e96b616 | 1355 | control_server_pid = buffer_get_int(&m); |
1356 | ||
5e96b616 | 1357 | buffer_clear(&m); |
5e96b616 | 1358 | |
f8c6db83 | 1359 | switch (mux_command) { |
1360 | case SSHMUX_COMMAND_ALIVE_CHECK: | |
f8cc7664 | 1361 | fprintf(stderr, "Master running (pid=%d)\r\n", |
f8c6db83 | 1362 | control_server_pid); |
1363 | exit(0); | |
1364 | case SSHMUX_COMMAND_TERMINATE: | |
1365 | fprintf(stderr, "Exit request sent.\r\n"); | |
1366 | exit(0); | |
1367 | case SSHMUX_COMMAND_OPEN: | |
1368 | /* continue below */ | |
1369 | break; | |
1370 | default: | |
1371 | fatal("silly mux_command %d", mux_command); | |
1372 | } | |
1373 | ||
1374 | /* SSHMUX_COMMAND_OPEN */ | |
ef07103c | 1375 | buffer_put_cstring(&m, term ? term : ""); |
5e96b616 | 1376 | buffer_append(&command, "\0", 1); |
1377 | buffer_put_cstring(&m, buffer_ptr(&command)); | |
1378 | ||
67a08279 | 1379 | if (options.num_send_env == 0 || environ == NULL) { |
1380 | buffer_put_int(&m, 0); | |
f2107e97 | 1381 | } else { |
67a08279 | 1382 | /* Pass environment */ |
1383 | num_env = 0; | |
1384 | for (i = 0; environ[i] != NULL; i++) | |
1385 | if (env_permitted(environ[i])) | |
1386 | num_env++; /* Count */ | |
f2107e97 | 1387 | |
67a08279 | 1388 | buffer_put_int(&m, num_env); |
1389 | ||
77c50919 | 1390 | for (i = 0; environ[i] != NULL && num_env >= 0; i++) |
1391 | if (env_permitted(environ[i])) { | |
1392 | num_env--; | |
67a08279 | 1393 | buffer_put_cstring(&m, environ[i]); |
77c50919 | 1394 | } |
67a08279 | 1395 | } |
1786be35 | 1396 | |
ef07103c | 1397 | if (ssh_msg_send(sock, SSHMUX_VER, &m) == -1) |
5e96b616 | 1398 | fatal("%s: msg_send", __func__); |
1399 | ||
1400 | mm_send_fd(sock, STDIN_FILENO); | |
1401 | mm_send_fd(sock, STDOUT_FILENO); | |
1402 | mm_send_fd(sock, STDERR_FILENO); | |
1403 | ||
1404 | /* Wait for reply, so master has a chance to gather ttymodes */ | |
1405 | buffer_clear(&m); | |
1406 | if (ssh_msg_recv(sock, &m) == -1) | |
1407 | fatal("%s: msg_recv", __func__); | |
ef07103c | 1408 | if (buffer_get_char(&m) != SSHMUX_VER) |
f8c6db83 | 1409 | fatal("%s: wrong version", __func__); |
5e96b616 | 1410 | buffer_free(&m); |
1411 | ||
d3e5d1e9 | 1412 | signal(SIGHUP, control_client_sighandler); |
78d2b454 | 1413 | signal(SIGINT, control_client_sighandler); |
1414 | signal(SIGTERM, control_client_sighandler); | |
1415 | signal(SIGWINCH, control_client_sigrelay); | |
1416 | ||
5e96b616 | 1417 | if (tty_flag) |
1418 | enter_raw_mode(); | |
1419 | ||
1420 | /* Stick around until the controlee closes the client_fd */ | |
1421 | exitval = 0; | |
1422 | for (;!control_client_terminate;) { | |
1423 | r = read(sock, &exitval, sizeof(exitval)); | |
1424 | if (r == 0) { | |
1425 | debug2("Received EOF from master"); | |
1426 | break; | |
1427 | } | |
1428 | if (r > 0) | |
1429 | debug2("Received exit status from master %d", exitval); | |
1430 | if (r == -1 && errno != EINTR) | |
1431 | fatal("%s: read %s", __func__, strerror(errno)); | |
1432 | } | |
1433 | ||
1434 | if (control_client_terminate) | |
1435 | debug2("Exiting on signal %d", control_client_terminate); | |
1436 | ||
1437 | close(sock); | |
1438 | ||
1439 | leave_raw_mode(); | |
1440 | ||
1441 | if (tty_flag && options.log_level != SYSLOG_LEVEL_QUIET) | |
1442 | fprintf(stderr, "Connection to master closed.\r\n"); | |
1443 | ||
1444 | exit(exitval); | |
1445 | } |