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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" | |
cebb4c24 | 43 | RCSID("$OpenBSD: ssh.c,v 1.262 2006/02/20 16:36:15 stevesk Exp $"); |
876faccd | 44 | |
45 | #include <sys/resource.h> | |
bd7c69ea | 46 | #include <sys/ioctl.h> |
cebb4c24 | 47 | #include <sys/types.h> |
48 | #include <sys/un.h> | |
a75f5360 | 49 | |
50 | #include <paths.h> | |
8efc0c15 | 51 | |
a306f2dd | 52 | #include <openssl/evp.h> |
fa08c86b | 53 | #include <openssl/err.h> |
a306f2dd | 54 | |
8efc0c15 | 55 | #include "ssh.h" |
42f11eb2 | 56 | #include "ssh1.h" |
57 | #include "ssh2.h" | |
58 | #include "compat.h" | |
59 | #include "cipher.h" | |
60 | #include "xmalloc.h" | |
8efc0c15 | 61 | #include "packet.h" |
62 | #include "buffer.h" | |
5e96b616 | 63 | #include "bufaux.h" |
a5efa1bb | 64 | #include "channels.h" |
a306f2dd | 65 | #include "key.h" |
4c8722d9 | 66 | #include "authfd.h" |
a306f2dd | 67 | #include "authfile.h" |
42f11eb2 | 68 | #include "pathnames.h" |
5e96b616 | 69 | #include "dispatch.h" |
b5c334cc | 70 | #include "clientloop.h" |
42f11eb2 | 71 | #include "log.h" |
72 | #include "readconf.h" | |
73 | #include "sshconnect.h" | |
42f11eb2 | 74 | #include "misc.h" |
b2552997 | 75 | #include "kex.h" |
76 | #include "mac.h" | |
07d80252 | 77 | #include "sshpty.h" |
61a2c1da | 78 | #include "match.h" |
5e96b616 | 79 | #include "msg.h" |
80 | #include "monitor_fdpass.h" | |
6213295d | 81 | #include "uidswap.h" |
8efc0c15 | 82 | |
383546c4 | 83 | #ifdef SMARTCARD |
383546c4 | 84 | #include "scard.h" |
dd2495cb | 85 | #endif |
383546c4 | 86 | |
f601d847 | 87 | extern char *__progname; |
f601d847 | 88 | |
5260325f | 89 | /* Flag indicating whether debug mode is on. This can be set on the command line. */ |
8efc0c15 | 90 | int debug_flag = 0; |
91 | ||
a8be9f80 | 92 | /* Flag indicating whether a tty should be allocated */ |
8efc0c15 | 93 | int tty_flag = 0; |
8abcdba4 | 94 | int no_tty_flag = 0; |
95 | int force_tty_flag = 0; | |
8efc0c15 | 96 | |
8ce64345 | 97 | /* don't exec a shell */ |
98 | int no_shell_flag = 0; | |
8ce64345 | 99 | |
aa3378df | 100 | /* |
101 | * Flag indicating that nothing should be read from stdin. This can be set | |
102 | * on the command line. | |
103 | */ | |
8efc0c15 | 104 | int stdin_null_flag = 0; |
105 | ||
aa3378df | 106 | /* |
107 | * Flag indicating that ssh should fork after authentication. This is useful | |
c242fc96 | 108 | * so that the passphrase can be entered manually, and then ssh goes to the |
aa3378df | 109 | * background. |
110 | */ | |
8efc0c15 | 111 | int fork_after_authentication_flag = 0; |
112 | ||
aa3378df | 113 | /* |
114 | * General data structure for command line options and options configurable | |
115 | * in configuration files. See readconf.h. | |
116 | */ | |
8efc0c15 | 117 | Options options; |
118 | ||
e591b98a | 119 | /* optional user configfile */ |
120 | char *config = NULL; | |
121 | ||
aa3378df | 122 | /* |
123 | * Name of the host we are connecting to. This is the name given on the | |
124 | * command line, or the HostName specified for the user-supplied name in a | |
125 | * configuration file. | |
126 | */ | |
8efc0c15 | 127 | char *host; |
128 | ||
129 | /* socket address the host resolves to */ | |
48e671d5 | 130 | struct sockaddr_storage hostaddr; |
8efc0c15 | 131 | |
8002af61 | 132 | /* Private host keys. */ |
39c00dc2 | 133 | Sensitive sensitive_data; |
8efc0c15 | 134 | |
135 | /* Original real UID. */ | |
136 | uid_t original_real_uid; | |
3fb156df | 137 | uid_t original_effective_uid; |
8efc0c15 | 138 | |
8ce64345 | 139 | /* command to be executed */ |
140 | Buffer command; | |
141 | ||
ae810de7 | 142 | /* Should we execute a command or invoke a subsystem? */ |
143 | int subsystem_flag = 0; | |
144 | ||
e0ae8728 | 145 | /* # of replies received for global requests */ |
146 | static int client_global_request_id = 0; | |
147 | ||
6939bbd4 | 148 | /* pid of proxycommand child process */ |
149 | pid_t proxy_command_pid = 0; | |
150 | ||
5e96b616 | 151 | /* fd to control socket */ |
152 | int control_fd = -1; | |
153 | ||
f8c6db83 | 154 | /* Multiplexing control command */ |
19186c3d | 155 | static u_int mux_command = 0; |
f8c6db83 | 156 | |
5e96b616 | 157 | /* Only used in control client mode */ |
158 | volatile sig_atomic_t control_client_terminate = 0; | |
159 | u_int control_server_pid = 0; | |
160 | ||
8efc0c15 | 161 | /* Prints a help message to the user. This function never returns. */ |
162 | ||
396c147e | 163 | static void |
5ca51e19 | 164 | usage(void) |
8efc0c15 | 165 | { |
182ccbba | 166 | fprintf(stderr, |
aeefce7a | 167 | "usage: ssh [-1246AaCfgkMNnqsTtVvXxY] [-b bind_address] [-c cipher_spec]\n" |
80e29ee6 | 168 | " [-D [bind_address:]port] [-e escape_char] [-F configfile]\n" |
8cf98c65 | 169 | " [-i identity_file] [-L [bind_address:]port:host:hostport]\n" |
3867aa0a | 170 | " [-l login_name] [-m mac_spec] [-O ctl_cmd] [-o option] [-p port]\n" |
8cf98c65 | 171 | " [-R [bind_address:]port:host:hostport] [-S ctl_path]\n" |
d20f3c9e | 172 | " [-w tunnel:tunnel] [user@]hostname [command]\n" |
182ccbba | 173 | ); |
3aa43b24 | 174 | exit(255); |
8efc0c15 | 175 | } |
176 | ||
396c147e | 177 | static int ssh_session(void); |
178 | static int ssh_session2(void); | |
179 | static void load_public_identity_files(void); | |
5e96b616 | 180 | static void control_client(const char *path); |
8ce64345 | 181 | |
5260325f | 182 | /* |
183 | * Main program for the ssh client. | |
184 | */ | |
8efc0c15 | 185 | int |
186 | main(int ac, char **av) | |
187 | { | |
b34bec32 | 188 | int i, opt, exit_status; |
1aafd17a | 189 | char *p, *cp, *line, buf[256]; |
5260325f | 190 | struct stat st; |
3b1a83df | 191 | struct passwd *pw; |
8ce64345 | 192 | int dummy; |
57dade33 | 193 | extern int optind, optreset; |
1812a662 | 194 | extern char *optarg; |
c1cbe68a | 195 | struct servent *sp; |
3867aa0a | 196 | Forward fwd; |
5260325f | 197 | |
fd6168c1 | 198 | /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ |
199 | sanitise_stdfd(); | |
200 | ||
fda04d7d | 201 | __progname = ssh_get_progname(av[0]); |
264dce47 | 202 | init_rng(); |
203 | ||
aa3378df | 204 | /* |
205 | * Save the original real uid. It will be needed later (uid-swapping | |
206 | * may clobber the real uid). | |
207 | */ | |
5260325f | 208 | original_real_uid = getuid(); |
209 | original_effective_uid = geteuid(); | |
aff51935 | 210 | |
9f324470 | 211 | /* |
212 | * Use uid-swapping to give up root privileges for the duration of | |
213 | * option processing. We will re-instantiate the rights when we are | |
214 | * ready to create the privileged port, and will permanently drop | |
215 | * them when the port has been created (actually, when the connection | |
216 | * has been made, as we may need to create the port several times). | |
217 | */ | |
218 | PRIV_END; | |
5260325f | 219 | |
7322ef0e | 220 | #ifdef HAVE_SETRLIMIT |
5260325f | 221 | /* If we are installed setuid root be careful to not drop core. */ |
222 | if (original_real_uid != original_effective_uid) { | |
223 | struct rlimit rlim; | |
224 | rlim.rlim_cur = rlim.rlim_max = 0; | |
225 | if (setrlimit(RLIMIT_CORE, &rlim) < 0) | |
226 | fatal("setrlimit failed: %.100s", strerror(errno)); | |
8efc0c15 | 227 | } |
3c62e7eb | 228 | #endif |
63bd8c36 | 229 | /* Get user data. */ |
230 | pw = getpwuid(original_real_uid); | |
231 | if (!pw) { | |
bbe88b6d | 232 | logit("You don't exist, go away!"); |
3aa43b24 | 233 | exit(255); |
63bd8c36 | 234 | } |
235 | /* Take a copy of the returned structure. */ | |
236 | pw = pwcopy(pw); | |
237 | ||
aa3378df | 238 | /* |
239 | * Set our umask to something reasonable, as some files are created | |
240 | * with the default umask. This will make them world-readable but | |
241 | * writable only by the owner, which is ok for all files for which we | |
242 | * don't set the modes explicitly. | |
243 | */ | |
5260325f | 244 | umask(022); |
245 | ||
5260325f | 246 | /* Initialize option structure to indicate that no values have been set. */ |
247 | initialize_options(&options); | |
248 | ||
249 | /* Parse command-line arguments. */ | |
250 | host = NULL; | |
251 | ||
f5a1a01a | 252 | again: |
253 | while ((opt = getopt(ac, av, | |
d20f3c9e | 254 | "1246ab:c:e:fgi:kl:m:no:p:qstvxACD:F:I:L:MNO:PR:S:TVw:XY")) != -1) { |
5260325f | 255 | switch (opt) { |
1f3bf5aa | 256 | case '1': |
257 | options.protocol = SSH_PROTO_1; | |
258 | break; | |
6ae2364d | 259 | case '2': |
260 | options.protocol = SSH_PROTO_2; | |
261 | break; | |
48e671d5 | 262 | case '4': |
1572b90f | 263 | options.address_family = AF_INET; |
48e671d5 | 264 | break; |
48e671d5 | 265 | case '6': |
1572b90f | 266 | options.address_family = AF_INET6; |
48e671d5 | 267 | break; |
5260325f | 268 | case 'n': |
269 | stdin_null_flag = 1; | |
270 | break; | |
5260325f | 271 | case 'f': |
272 | fork_after_authentication_flag = 1; | |
273 | stdin_null_flag = 1; | |
274 | break; | |
5260325f | 275 | case 'x': |
276 | options.forward_x11 = 0; | |
277 | break; | |
5260325f | 278 | case 'X': |
279 | options.forward_x11 = 1; | |
280 | break; | |
d73a67d7 | 281 | case 'Y': |
282 | options.forward_x11 = 1; | |
283 | options.forward_x11_trusted = 1; | |
284 | break; | |
5260325f | 285 | case 'g': |
286 | options.gateway_ports = 1; | |
287 | break; | |
f8c6db83 | 288 | case 'O': |
289 | if (strcmp(optarg, "check") == 0) | |
290 | mux_command = SSHMUX_COMMAND_ALIVE_CHECK; | |
291 | else if (strcmp(optarg, "exit") == 0) | |
292 | mux_command = SSHMUX_COMMAND_TERMINATE; | |
293 | else | |
294 | fatal("Invalid multiplex command."); | |
295 | break; | |
e59404d1 | 296 | case 'P': /* deprecated */ |
5260325f | 297 | options.use_privileged_port = 0; |
298 | break; | |
5260325f | 299 | case 'a': |
300 | options.forward_agent = 0; | |
301 | break; | |
71276795 | 302 | case 'A': |
303 | options.forward_agent = 1; | |
304 | break; | |
5260325f | 305 | case 'k': |
f7926e97 | 306 | options.gss_deleg_creds = 0; |
5260325f | 307 | break; |
5260325f | 308 | case 'i': |
309 | if (stat(optarg, &st) < 0) { | |
f5a1a01a | 310 | fprintf(stderr, "Warning: Identity file %s " |
ec304d66 | 311 | "not accessible: %s.\n", optarg, |
312 | strerror(errno)); | |
5260325f | 313 | break; |
314 | } | |
f5a1a01a | 315 | if (options.num_identity_files >= |
316 | SSH_MAX_IDENTITY_FILES) | |
317 | fatal("Too many identity files specified " | |
318 | "(max %d)", SSH_MAX_IDENTITY_FILES); | |
319 | options.identity_files[options.num_identity_files++] = | |
320 | xstrdup(optarg); | |
5260325f | 321 | break; |
383546c4 | 322 | case 'I': |
323 | #ifdef SMARTCARD | |
9ff6f66f | 324 | options.smartcard_device = xstrdup(optarg); |
dd2495cb | 325 | #else |
383546c4 | 326 | fprintf(stderr, "no support for smartcards.\n"); |
dd2495cb | 327 | #endif |
383546c4 | 328 | break; |
5260325f | 329 | case 't': |
8abcdba4 | 330 | if (tty_flag) |
331 | force_tty_flag = 1; | |
5260325f | 332 | tty_flag = 1; |
333 | break; | |
5260325f | 334 | case 'v': |
e053cd2c | 335 | if (debug_flag == 0) { |
bcbf86ec | 336 | debug_flag = 1; |
337 | options.log_level = SYSLOG_LEVEL_DEBUG1; | |
e053cd2c | 338 | } else { |
339 | if (options.log_level < SYSLOG_LEVEL_DEBUG3) | |
340 | options.log_level++; | |
bcbf86ec | 341 | break; |
e053cd2c | 342 | } |
59d4718a | 343 | /* FALLTHROUGH */ |
5260325f | 344 | case 'V': |
85ac7a84 | 345 | fprintf(stderr, "%s, %s\n", |
4526e8c2 | 346 | SSH_RELEASE, SSLeay_version(SSLEAY_VERSION)); |
5260325f | 347 | if (opt == 'V') |
348 | exit(0); | |
5260325f | 349 | break; |
d20f3c9e | 350 | case 'w': |
a4f24bf8 | 351 | if (options.tun_open == -1) |
352 | options.tun_open = SSH_TUNMODE_DEFAULT; | |
d20f3c9e | 353 | options.tun_local = a2tun(optarg, &options.tun_remote); |
a4f24bf8 | 354 | if (options.tun_local == SSH_TUNID_ERR) { |
d20f3c9e | 355 | fprintf(stderr, "Bad tun device '%s'\n", optarg); |
3aa43b24 | 356 | exit(255); |
d20f3c9e | 357 | } |
358 | break; | |
5260325f | 359 | case 'q': |
360 | options.log_level = SYSLOG_LEVEL_QUIET; | |
361 | break; | |
5260325f | 362 | case 'e': |
363 | if (optarg[0] == '^' && optarg[2] == 0 && | |
f5a1a01a | 364 | (u_char) optarg[1] >= 64 && |
365 | (u_char) optarg[1] < 128) | |
1e3b8b07 | 366 | options.escape_char = (u_char) optarg[1] & 31; |
5260325f | 367 | else if (strlen(optarg) == 1) |
1e3b8b07 | 368 | options.escape_char = (u_char) optarg[0]; |
5260325f | 369 | else if (strcmp(optarg, "none") == 0) |
4bf9c10e | 370 | options.escape_char = SSH_ESCAPECHAR_NONE; |
5260325f | 371 | else { |
f5a1a01a | 372 | fprintf(stderr, "Bad escape character '%s'.\n", |
373 | optarg); | |
3aa43b24 | 374 | exit(255); |
5260325f | 375 | } |
376 | break; | |
5260325f | 377 | case 'c': |
a306f2dd | 378 | if (ciphers_valid(optarg)) { |
379 | /* SSH2 only */ | |
380 | options.ciphers = xstrdup(optarg); | |
d77347cc | 381 | options.cipher = SSH_CIPHER_INVALID; |
a306f2dd | 382 | } else { |
383 | /* SSH1 only */ | |
c523303b | 384 | options.cipher = cipher_number(optarg); |
385 | if (options.cipher == -1) { | |
f5a1a01a | 386 | fprintf(stderr, |
387 | "Unknown cipher type '%s'\n", | |
388 | optarg); | |
3aa43b24 | 389 | exit(255); |
a306f2dd | 390 | } |
f5a1a01a | 391 | if (options.cipher == SSH_CIPHER_3DES) |
c523303b | 392 | options.ciphers = "3des-cbc"; |
f5a1a01a | 393 | else if (options.cipher == SSH_CIPHER_BLOWFISH) |
c523303b | 394 | options.ciphers = "blowfish-cbc"; |
f5a1a01a | 395 | else |
c523303b | 396 | options.ciphers = (char *)-1; |
5260325f | 397 | } |
398 | break; | |
b2552997 | 399 | case 'm': |
400 | if (mac_valid(optarg)) | |
401 | options.macs = xstrdup(optarg); | |
402 | else { | |
f5a1a01a | 403 | fprintf(stderr, "Unknown mac type '%s'\n", |
404 | optarg); | |
3aa43b24 | 405 | exit(255); |
b2552997 | 406 | } |
407 | break; | |
5e96b616 | 408 | case 'M': |
9dfd96d6 | 409 | if (options.control_master == SSHCTL_MASTER_YES) |
410 | options.control_master = SSHCTL_MASTER_ASK; | |
411 | else | |
412 | options.control_master = SSHCTL_MASTER_YES; | |
5e96b616 | 413 | break; |
5260325f | 414 | case 'p': |
2d2a2c65 | 415 | options.port = a2port(optarg); |
416 | if (options.port == 0) { | |
6031af8d | 417 | fprintf(stderr, "Bad port '%s'\n", optarg); |
3aa43b24 | 418 | exit(255); |
6031af8d | 419 | } |
5260325f | 420 | break; |
5260325f | 421 | case 'l': |
422 | options.user = optarg; | |
423 | break; | |
d2e3df16 | 424 | |
425 | case 'L': | |
3867aa0a | 426 | if (parse_forward(&fwd, optarg)) |
427 | add_local_forward(&options, &fwd); | |
428 | else { | |
f5a1a01a | 429 | fprintf(stderr, |
3867aa0a | 430 | "Bad local forwarding specification '%s'\n", |
f5a1a01a | 431 | optarg); |
3aa43b24 | 432 | exit(255); |
5260325f | 433 | } |
3867aa0a | 434 | break; |
435 | ||
436 | case 'R': | |
437 | if (parse_forward(&fwd, optarg)) { | |
438 | add_remote_forward(&options, &fwd); | |
439 | } else { | |
f5a1a01a | 440 | fprintf(stderr, |
3867aa0a | 441 | "Bad remote forwarding specification " |
442 | "'%s'\n", optarg); | |
3aa43b24 | 443 | exit(255); |
5260325f | 444 | } |
5260325f | 445 | break; |
0490e609 | 446 | |
447 | case 'D': | |
3867aa0a | 448 | cp = p = xstrdup(optarg); |
449 | memset(&fwd, '\0', sizeof(fwd)); | |
450 | fwd.connect_host = "socks"; | |
451 | if ((fwd.listen_host = hpdelim(&cp)) == NULL) { | |
452 | fprintf(stderr, "Bad dynamic forwarding " | |
453 | "specification '%.100s'\n", optarg); | |
3aa43b24 | 454 | exit(255); |
3867aa0a | 455 | } |
456 | if (cp != NULL) { | |
457 | fwd.listen_port = a2port(cp); | |
458 | fwd.listen_host = cleanhostname(fwd.listen_host); | |
459 | } else { | |
460 | fwd.listen_port = a2port(fwd.listen_host); | |
7c840747 | 461 | fwd.listen_host = NULL; |
3867aa0a | 462 | } |
463 | ||
464 | if (fwd.listen_port == 0) { | |
f5a1a01a | 465 | fprintf(stderr, "Bad dynamic port '%s'\n", |
466 | optarg); | |
3aa43b24 | 467 | exit(255); |
6031af8d | 468 | } |
3867aa0a | 469 | add_local_forward(&options, &fwd); |
470 | xfree(p); | |
0490e609 | 471 | break; |
472 | ||
5260325f | 473 | case 'C': |
474 | options.compression = 1; | |
475 | break; | |
8ce64345 | 476 | case 'N': |
477 | no_shell_flag = 1; | |
478 | no_tty_flag = 1; | |
479 | break; | |
8ce64345 | 480 | case 'T': |
481 | no_tty_flag = 1; | |
482 | break; | |
5260325f | 483 | case 'o': |
484 | dummy = 1; | |
1aafd17a | 485 | line = xstrdup(optarg); |
f5a1a01a | 486 | if (process_config_line(&options, host ? host : "", |
1aafd17a | 487 | line, "command-line", 0, &dummy) != 0) |
3aa43b24 | 488 | exit(255); |
1aafd17a | 489 | xfree(line); |
5260325f | 490 | break; |
ae810de7 | 491 | case 's': |
492 | subsystem_flag = 1; | |
493 | break; | |
5e96b616 | 494 | case 'S': |
495 | if (options.control_path != NULL) | |
496 | free(options.control_path); | |
497 | options.control_path = xstrdup(optarg); | |
5e96b616 | 498 | break; |
3435f5a6 | 499 | case 'b': |
500 | options.bind_address = optarg; | |
501 | break; | |
e591b98a | 502 | case 'F': |
503 | config = optarg; | |
504 | break; | |
5260325f | 505 | default: |
506 | usage(); | |
507 | } | |
508 | } | |
509 | ||
f5a1a01a | 510 | ac -= optind; |
511 | av += optind; | |
512 | ||
513 | if (ac > 0 && !host && **av != '-') { | |
15748b4d | 514 | if (strrchr(*av, '@')) { |
f5a1a01a | 515 | p = xstrdup(*av); |
15748b4d | 516 | cp = strrchr(p, '@'); |
f5a1a01a | 517 | if (cp == NULL || cp == p) |
518 | usage(); | |
519 | options.user = p; | |
520 | *cp = '\0'; | |
521 | host = ++cp; | |
522 | } else | |
523 | host = *av; | |
978ebf99 | 524 | if (ac > 1) { |
525 | optind = optreset = 1; | |
f5a1a01a | 526 | goto again; |
527 | } | |
978ebf99 | 528 | ac--, av++; |
f5a1a01a | 529 | } |
530 | ||
5260325f | 531 | /* Check that we got a host name. */ |
532 | if (!host) | |
8efc0c15 | 533 | usage(); |
5260325f | 534 | |
22d89d24 | 535 | SSLeay_add_all_algorithms(); |
fa08c86b | 536 | ERR_load_crypto_strings(); |
22d89d24 | 537 | |
5260325f | 538 | /* Initialize the command to execute on remote host. */ |
539 | buffer_init(&command); | |
540 | ||
aa3378df | 541 | /* |
542 | * Save the command to execute on the remote host in a buffer. There | |
543 | * is no limit on the length of the command, except by the maximum | |
544 | * packet size. Also sets the tty flag if there is no command. | |
545 | */ | |
f5a1a01a | 546 | if (!ac) { |
5260325f | 547 | /* No command specified - execute shell on a tty. */ |
548 | tty_flag = 1; | |
ae810de7 | 549 | if (subsystem_flag) { |
f5a1a01a | 550 | fprintf(stderr, |
551 | "You must specify a subsystem to invoke.\n"); | |
ae810de7 | 552 | usage(); |
553 | } | |
5260325f | 554 | } else { |
f5a1a01a | 555 | /* A command has been specified. Store it into the buffer. */ |
556 | for (i = 0; i < ac; i++) { | |
557 | if (i) | |
5260325f | 558 | buffer_append(&command, " ", 1); |
559 | buffer_append(&command, av[i], strlen(av[i])); | |
560 | } | |
8efc0c15 | 561 | } |
5260325f | 562 | |
563 | /* Cannot fork to background if no command. */ | |
14a9a859 | 564 | if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag) |
5260325f | 565 | fatal("Cannot fork into background without a command to execute."); |
566 | ||
567 | /* Allocate a tty by default if no command specified. */ | |
568 | if (buffer_len(&command) == 0) | |
569 | tty_flag = 1; | |
570 | ||
343288b8 | 571 | /* Force no tty */ |
0b6fbf03 | 572 | if (no_tty_flag) |
573 | tty_flag = 0; | |
5260325f | 574 | /* Do not allocate a tty if stdin is not a tty. */ |
7697ac2b | 575 | if ((!isatty(fileno(stdin)) || stdin_null_flag) && !force_tty_flag) { |
5260325f | 576 | if (tty_flag) |
bbe88b6d | 577 | logit("Pseudo-terminal will not be allocated because stdin is not a terminal."); |
5260325f | 578 | tty_flag = 0; |
579 | } | |
8ce64345 | 580 | |
20244695 | 581 | /* |
582 | * Initialize "log" output. Since we are the client all output | |
583 | * actually goes to stderr. | |
584 | */ | |
cc44f691 | 585 | log_init(av[0], options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level, |
586 | SYSLOG_FACILITY_USER, 1); | |
5260325f | 587 | |
e591b98a | 588 | /* |
589 | * Read per-user configuration file. Ignore the system wide config | |
590 | * file if the user specifies a config file on the command line. | |
591 | */ | |
592 | if (config != NULL) { | |
f7f14143 | 593 | if (!read_config_file(config, host, &options, 0)) |
93111dfa | 594 | fatal("Can't open user config file %.100s: " |
595 | "%.100s", config, strerror(errno)); | |
e591b98a | 596 | } else { |
597 | snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, | |
598 | _PATH_SSH_USER_CONFFILE); | |
9f6cab4b | 599 | (void)read_config_file(buf, host, &options, 1); |
e591b98a | 600 | |
f67792f2 | 601 | /* Read systemwide configuration file after use config. */ |
f2107e97 | 602 | (void)read_config_file(_PATH_HOST_CONFIG_FILE, host, |
9f6cab4b | 603 | &options, 0); |
e591b98a | 604 | } |
5260325f | 605 | |
606 | /* Fill configuration defaults. */ | |
607 | fill_default_options(&options); | |
608 | ||
1572b90f | 609 | channel_set_af(options.address_family); |
610 | ||
5260325f | 611 | /* reinit */ |
20244695 | 612 | log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 1); |
5260325f | 613 | |
e339aa53 | 614 | seed_rng(); |
615 | ||
5260325f | 616 | if (options.user == NULL) |
617 | options.user = xstrdup(pw->pw_name); | |
618 | ||
619 | if (options.hostname != NULL) | |
620 | host = options.hostname; | |
621 | ||
03c82656 | 622 | /* force lowercase for hostkey matching */ |
623 | if (options.host_key_alias != NULL) { | |
624 | for (p = options.host_key_alias; *p; p++) | |
625 | if (isupper(*p)) | |
626 | *p = tolower(*p); | |
627 | } | |
628 | ||
de574442 | 629 | /* Get default port if port has not been set. */ |
630 | if (options.port == 0) { | |
631 | sp = getservbyname(SSH_SERVICE_NAME, "tcp"); | |
632 | options.port = sp ? ntohs(sp->s_port) : SSH_DEFAULT_PORT; | |
633 | } | |
634 | ||
f78bde70 | 635 | if (options.proxy_command != NULL && |
636 | strcmp(options.proxy_command, "none") == 0) | |
637 | options.proxy_command = NULL; | |
699255b5 | 638 | if (options.control_path != NULL && |
639 | strcmp(options.control_path, "none") == 0) | |
640 | options.control_path = NULL; | |
f78bde70 | 641 | |
5e96b616 | 642 | if (options.control_path != NULL) { |
f7b8224d | 643 | char me[NI_MAXHOST]; |
644 | ||
645 | if (gethostname(me, sizeof(me)) == -1) | |
646 | fatal("gethostname: %s", strerror(errno)); | |
a980cbd7 | 647 | snprintf(buf, sizeof(buf), "%d", options.port); |
648 | cp = tilde_expand_filename(options.control_path, | |
649 | original_real_uid); | |
650 | options.control_path = percent_expand(cp, "p", buf, "h", host, | |
f7b8224d | 651 | "r", options.user, "l", me, (char *)NULL); |
a980cbd7 | 652 | xfree(cp); |
5e96b616 | 653 | } |
19186c3d | 654 | if (mux_command != 0 && options.control_path == NULL) |
655 | fatal("No ControlPath specified for \"-O\" command"); | |
9dfd96d6 | 656 | if (options.control_path != NULL) |
cc8ca1e6 | 657 | control_client(options.control_path); |
5e96b616 | 658 | |
6ffc9c88 | 659 | /* Open a connection to the remote host. */ |
1572b90f | 660 | if (ssh_connect(host, &hostaddr, options.port, |
661 | options.address_family, options.connection_attempts, | |
d514c907 | 662 | #ifdef HAVE_CYGWIN |
663 | options.use_privileged_port, | |
664 | #else | |
3fb156df | 665 | original_effective_uid == 0 && options.use_privileged_port, |
d514c907 | 666 | #endif |
de60473e | 667 | options.proxy_command) != 0) |
3aa43b24 | 668 | exit(255); |
5260325f | 669 | |
aa3378df | 670 | /* |
671 | * If we successfully made the connection, load the host private key | |
672 | * in case we will need it later for combined rsa-rhosts | |
673 | * authentication. This must be done before releasing extra | |
674 | * privileges, because the file is only readable by root. | |
78660ed4 | 675 | * If we cannot access the private keys, load the public keys |
676 | * instead and try to execute the ssh-keysign helper instead. | |
aa3378df | 677 | */ |
8002af61 | 678 | sensitive_data.nkeys = 0; |
679 | sensitive_data.keys = NULL; | |
39c00dc2 | 680 | sensitive_data.external_keysign = 0; |
b34bec32 | 681 | if (options.rhosts_rsa_authentication || |
682 | options.hostbased_authentication) { | |
8002af61 | 683 | sensitive_data.nkeys = 3; |
343288b8 | 684 | sensitive_data.keys = xmalloc(sensitive_data.nkeys * |
685 | sizeof(Key)); | |
3fb156df | 686 | |
687 | PRIV_START; | |
8002af61 | 688 | sensitive_data.keys[0] = key_load_private_type(KEY_RSA1, |
aeaa3d9e | 689 | _PATH_HOST_KEY_FILE, "", NULL); |
8002af61 | 690 | sensitive_data.keys[1] = key_load_private_type(KEY_DSA, |
691 | _PATH_HOST_DSA_KEY_FILE, "", NULL); | |
692 | sensitive_data.keys[2] = key_load_private_type(KEY_RSA, | |
693 | _PATH_HOST_RSA_KEY_FILE, "", NULL); | |
3fb156df | 694 | PRIV_END; |
39c00dc2 | 695 | |
60cd0a97 | 696 | if (options.hostbased_authentication == 1 && |
697 | sensitive_data.keys[0] == NULL && | |
39c00dc2 | 698 | sensitive_data.keys[1] == NULL && |
699 | sensitive_data.keys[2] == NULL) { | |
700 | sensitive_data.keys[1] = key_load_public( | |
701 | _PATH_HOST_DSA_KEY_FILE, NULL); | |
702 | sensitive_data.keys[2] = key_load_public( | |
703 | _PATH_HOST_RSA_KEY_FILE, NULL); | |
704 | sensitive_data.external_keysign = 1; | |
705 | } | |
5260325f | 706 | } |
aa3378df | 707 | /* |
708 | * Get rid of any extra privileges that we may have. We will no | |
709 | * longer need them. Also, extra privileges could make it very hard | |
710 | * to read identity files and other non-world-readable files from the | |
711 | * user's home directory if it happens to be on a NFS volume where | |
712 | * root is mapped to nobody. | |
713 | */ | |
6213295d | 714 | if (original_effective_uid == 0) { |
715 | PRIV_START; | |
716 | permanently_set_uid(pw); | |
717 | } | |
5260325f | 718 | |
aa3378df | 719 | /* |
720 | * Now that we are back to our own permissions, create ~/.ssh | |
7b9b0103 | 721 | * directory if it doesn't already exist. |
aa3378df | 722 | */ |
c3abff07 | 723 | snprintf(buf, sizeof buf, "%.100s%s%.100s", pw->pw_dir, strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR); |
5260325f | 724 | if (stat(buf, &st) < 0) |
704b1659 | 725 | if (mkdir(buf, 0700) < 0) |
5260325f | 726 | error("Could not create directory '%.200s'.", buf); |
727 | ||
fee56204 | 728 | /* load options.identity_files */ |
729 | load_public_identity_files(); | |
730 | ||
731 | /* Expand ~ in known host file names. */ | |
732 | /* XXX mem-leaks: */ | |
fa08c86b | 733 | options.system_hostfile = |
734 | tilde_expand_filename(options.system_hostfile, original_real_uid); | |
735 | options.user_hostfile = | |
736 | tilde_expand_filename(options.user_hostfile, original_real_uid); | |
737 | options.system_hostfile2 = | |
738 | tilde_expand_filename(options.system_hostfile2, original_real_uid); | |
739 | options.user_hostfile2 = | |
740 | tilde_expand_filename(options.user_hostfile2, original_real_uid); | |
5260325f | 741 | |
67b75437 | 742 | signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */ |
743 | ||
5260325f | 744 | /* Log into the remote system. This never returns if the login fails. */ |
39c00dc2 | 745 | ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr, pw); |
8002af61 | 746 | |
747 | /* We no longer need the private host keys. Clear them now. */ | |
748 | if (sensitive_data.nkeys != 0) { | |
749 | for (i = 0; i < sensitive_data.nkeys; i++) { | |
750 | if (sensitive_data.keys[i] != NULL) { | |
751 | /* Destroys contents safely */ | |
752 | debug3("clear hostkey %d", i); | |
753 | key_free(sensitive_data.keys[i]); | |
754 | sensitive_data.keys[i] = NULL; | |
755 | } | |
756 | } | |
757 | xfree(sensitive_data.keys); | |
758 | } | |
05b7537a | 759 | for (i = 0; i < options.num_identity_files; i++) { |
760 | if (options.identity_files[i]) { | |
761 | xfree(options.identity_files[i]); | |
762 | options.identity_files[i] = NULL; | |
763 | } | |
764 | if (options.identity_keys[i]) { | |
765 | key_free(options.identity_keys[i]); | |
766 | options.identity_keys[i] = NULL; | |
767 | } | |
768 | } | |
5260325f | 769 | |
8ce64345 | 770 | exit_status = compat20 ? ssh_session2() : ssh_session(); |
771 | packet_close(); | |
6939bbd4 | 772 | |
5e96b616 | 773 | if (options.control_path != NULL && control_fd != -1) |
774 | unlink(options.control_path); | |
775 | ||
6939bbd4 | 776 | /* |
aff51935 | 777 | * Send SIGHUP to proxy command if used. We don't wait() in |
6939bbd4 | 778 | * case it hangs and instead rely on init to reap the child |
779 | */ | |
780 | if (proxy_command_pid > 1) | |
781 | kill(proxy_command_pid, SIGHUP); | |
782 | ||
8ce64345 | 783 | return exit_status; |
784 | } | |
785 | ||
396c147e | 786 | static void |
fa08c86b | 787 | ssh_init_forwarding(void) |
788 | { | |
02a024dd | 789 | int success = 0; |
fa08c86b | 790 | int i; |
02a024dd | 791 | |
fa08c86b | 792 | /* Initiate local TCP/IP port forwardings. */ |
793 | for (i = 0; i < options.num_local_forwards; i++) { | |
3867aa0a | 794 | debug("Local connections to %.200s:%d forwarded to remote " |
795 | "address %.200s:%d", | |
f8cc7664 | 796 | (options.local_forwards[i].listen_host == NULL) ? |
797 | (options.gateway_ports ? "*" : "LOCALHOST") : | |
3867aa0a | 798 | options.local_forwards[i].listen_host, |
799 | options.local_forwards[i].listen_port, | |
800 | options.local_forwards[i].connect_host, | |
801 | options.local_forwards[i].connect_port); | |
5641aefa | 802 | success += channel_setup_local_fwd_listener( |
3867aa0a | 803 | options.local_forwards[i].listen_host, |
804 | options.local_forwards[i].listen_port, | |
805 | options.local_forwards[i].connect_host, | |
806 | options.local_forwards[i].connect_port, | |
fa08c86b | 807 | options.gateway_ports); |
808 | } | |
02a024dd | 809 | if (i > 0 && success == 0) |
810 | error("Could not request local forwarding."); | |
fa08c86b | 811 | |
812 | /* Initiate remote TCP/IP port forwardings. */ | |
813 | for (i = 0; i < options.num_remote_forwards; i++) { | |
3867aa0a | 814 | debug("Remote connections from %.200s:%d forwarded to " |
815 | "local address %.200s:%d", | |
56964485 | 816 | (options.remote_forwards[i].listen_host == NULL) ? |
aa9bc1de | 817 | "LOCALHOST" : options.remote_forwards[i].listen_host, |
3867aa0a | 818 | options.remote_forwards[i].listen_port, |
819 | options.remote_forwards[i].connect_host, | |
820 | options.remote_forwards[i].connect_port); | |
fa08c86b | 821 | channel_request_remote_forwarding( |
3867aa0a | 822 | options.remote_forwards[i].listen_host, |
823 | options.remote_forwards[i].listen_port, | |
824 | options.remote_forwards[i].connect_host, | |
825 | options.remote_forwards[i].connect_port); | |
fa08c86b | 826 | } |
827 | } | |
828 | ||
396c147e | 829 | static void |
fa08c86b | 830 | check_agent_present(void) |
831 | { | |
832 | if (options.forward_agent) { | |
7b9b0103 | 833 | /* Clear agent forwarding if we don't have an agent. */ |
8b10e20e | 834 | if (!ssh_agent_present()) |
fa08c86b | 835 | options.forward_agent = 0; |
fa08c86b | 836 | } |
837 | } | |
838 | ||
396c147e | 839 | static int |
8ce64345 | 840 | ssh_session(void) |
841 | { | |
842 | int type; | |
8ce64345 | 843 | int interactive = 0; |
844 | int have_tty = 0; | |
845 | struct winsize ws; | |
8ce64345 | 846 | char *cp; |
9bf083eb | 847 | const char *display; |
8ce64345 | 848 | |
5260325f | 849 | /* Enable compression if requested. */ |
850 | if (options.compression) { | |
851 | debug("Requesting compression at level %d.", options.compression_level); | |
852 | ||
853 | if (options.compression_level < 1 || options.compression_level > 9) | |
854 | fatal("Compression level must be from 1 (fast) to 9 (slow, best)."); | |
855 | ||
856 | /* Send the request. */ | |
857 | packet_start(SSH_CMSG_REQUEST_COMPRESSION); | |
858 | packet_put_int(options.compression_level); | |
859 | packet_send(); | |
860 | packet_write_wait(); | |
54a5250f | 861 | type = packet_read(); |
5260325f | 862 | if (type == SSH_SMSG_SUCCESS) |
863 | packet_start_compression(options.compression_level); | |
864 | else if (type == SSH_SMSG_FAILURE) | |
bbe88b6d | 865 | logit("Warning: Remote host refused compression."); |
5260325f | 866 | else |
867 | packet_disconnect("Protocol error waiting for compression response."); | |
868 | } | |
869 | /* Allocate a pseudo tty if appropriate. */ | |
870 | if (tty_flag) { | |
871 | debug("Requesting pty."); | |
872 | ||
873 | /* Start the packet. */ | |
874 | packet_start(SSH_CMSG_REQUEST_PTY); | |
875 | ||
876 | /* Store TERM in the packet. There is no limit on the | |
877 | length of the string. */ | |
878 | cp = getenv("TERM"); | |
879 | if (!cp) | |
880 | cp = ""; | |
449c5ba5 | 881 | packet_put_cstring(cp); |
5260325f | 882 | |
883 | /* Store window size in the packet. */ | |
884 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) | |
885 | memset(&ws, 0, sizeof(ws)); | |
886 | packet_put_int(ws.ws_row); | |
887 | packet_put_int(ws.ws_col); | |
888 | packet_put_int(ws.ws_xpixel); | |
889 | packet_put_int(ws.ws_ypixel); | |
890 | ||
891 | /* Store tty modes in the packet. */ | |
30dcc918 | 892 | tty_make_modes(fileno(stdin), NULL); |
5260325f | 893 | |
894 | /* Send the packet, and wait for it to leave. */ | |
895 | packet_send(); | |
896 | packet_write_wait(); | |
897 | ||
898 | /* Read response from the server. */ | |
54a5250f | 899 | type = packet_read(); |
4fe2af09 | 900 | if (type == SSH_SMSG_SUCCESS) { |
5260325f | 901 | interactive = 1; |
8ce64345 | 902 | have_tty = 1; |
4fe2af09 | 903 | } else if (type == SSH_SMSG_FAILURE) |
bbe88b6d | 904 | logit("Warning: Remote host failed or refused to allocate a pseudo tty."); |
5260325f | 905 | else |
906 | packet_disconnect("Protocol error waiting for pty request response."); | |
907 | } | |
908 | /* Request X11 forwarding if enabled and DISPLAY is set. */ | |
9bf083eb | 909 | display = getenv("DISPLAY"); |
910 | if (options.forward_x11 && display != NULL) { | |
b48eeb07 | 911 | char *proto, *data; |
0b242b12 | 912 | /* Get reasonable local authentication information. */ |
9bf083eb | 913 | client_x11_get_proto(display, options.xauth_location, |
914 | options.forward_x11_trusted, &proto, &data); | |
0b242b12 | 915 | /* Request forwarding with authentication spoofing. */ |
5260325f | 916 | debug("Requesting X11 forwarding with authentication spoofing."); |
9bf083eb | 917 | x11_request_forwarding_with_spoofing(0, display, proto, data); |
5260325f | 918 | |
919 | /* Read response from the server. */ | |
54a5250f | 920 | type = packet_read(); |
5260325f | 921 | if (type == SSH_SMSG_SUCCESS) { |
5260325f | 922 | interactive = 1; |
0b242b12 | 923 | } else if (type == SSH_SMSG_FAILURE) { |
bbe88b6d | 924 | logit("Warning: Remote host denied X11 forwarding."); |
0b242b12 | 925 | } else { |
5260325f | 926 | packet_disconnect("Protocol error waiting for X11 forwarding"); |
0b242b12 | 927 | } |
5260325f | 928 | } |
929 | /* Tell the packet module whether this is an interactive session. */ | |
b5c334cc | 930 | packet_set_interactive(interactive); |
5260325f | 931 | |
932 | /* Request authentication agent forwarding if appropriate. */ | |
fa08c86b | 933 | check_agent_present(); |
934 | ||
5260325f | 935 | if (options.forward_agent) { |
936 | debug("Requesting authentication agent forwarding."); | |
937 | auth_request_forwarding(); | |
938 | ||
939 | /* Read response from the server. */ | |
54a5250f | 940 | type = packet_read(); |
95500969 | 941 | packet_check_eom(); |
5260325f | 942 | if (type != SSH_SMSG_SUCCESS) |
bbe88b6d | 943 | logit("Warning: Remote host denied authentication agent forwarding."); |
5260325f | 944 | } |
8efc0c15 | 945 | |
fa08c86b | 946 | /* Initiate port forwardings. */ |
947 | ssh_init_forwarding(); | |
5260325f | 948 | |
aa3378df | 949 | /* If requested, let ssh continue in the background. */ |
6ae2364d | 950 | if (fork_after_authentication_flag) |
aa3378df | 951 | if (daemon(1, 1) < 0) |
952 | fatal("daemon() failed: %.200s", strerror(errno)); | |
953 | ||
954 | /* | |
955 | * If a command was specified on the command line, execute the | |
956 | * command now. Otherwise request the server to start a shell. | |
957 | */ | |
5260325f | 958 | if (buffer_len(&command) > 0) { |
959 | int len = buffer_len(&command); | |
960 | if (len > 900) | |
961 | len = 900; | |
6c0fa2b1 | 962 | debug("Sending command: %.*s", len, (u_char *)buffer_ptr(&command)); |
5260325f | 963 | packet_start(SSH_CMSG_EXEC_CMD); |
964 | packet_put_string(buffer_ptr(&command), buffer_len(&command)); | |
965 | packet_send(); | |
966 | packet_write_wait(); | |
967 | } else { | |
968 | debug("Requesting shell."); | |
969 | packet_start(SSH_CMSG_EXEC_SHELL); | |
970 | packet_send(); | |
971 | packet_write_wait(); | |
972 | } | |
973 | ||
974 | /* Enter the interactive session. */ | |
4bf9c10e | 975 | return client_loop(have_tty, tty_flag ? |
976 | options.escape_char : SSH_ESCAPECHAR_NONE, 0); | |
8ce64345 | 977 | } |
5260325f | 978 | |
396c147e | 979 | static void |
5e96b616 | 980 | ssh_subsystem_reply(int type, u_int32_t seq, void *ctxt) |
1f3bf5aa | 981 | { |
982 | int id, len; | |
983 | ||
984 | id = packet_get_int(); | |
985 | len = buffer_len(&command); | |
ce91d6f8 | 986 | if (len > 900) |
987 | len = 900; | |
95500969 | 988 | packet_check_eom(); |
1f3bf5aa | 989 | if (type == SSH2_MSG_CHANNEL_FAILURE) |
990 | fatal("Request for subsystem '%.*s' failed on channel %d", | |
6c0fa2b1 | 991 | len, (u_char *)buffer_ptr(&command), id); |
1f3bf5aa | 992 | } |
993 | ||
e0ae8728 | 994 | void |
5d8d32a3 | 995 | client_global_request_reply_fwd(int type, u_int32_t seq, void *ctxt) |
e0ae8728 | 996 | { |
997 | int i; | |
998 | ||
999 | i = client_global_request_id++; | |
5d8d32a3 | 1000 | if (i >= options.num_remote_forwards) |
e0ae8728 | 1001 | return; |
e0ae8728 | 1002 | debug("remote forward %s for: listen %d, connect %s:%d", |
1003 | type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure", | |
3867aa0a | 1004 | options.remote_forwards[i].listen_port, |
1005 | options.remote_forwards[i].connect_host, | |
1006 | options.remote_forwards[i].connect_port); | |
e0ae8728 | 1007 | if (type == SSH2_MSG_REQUEST_FAILURE) |
3867aa0a | 1008 | logit("Warning: remote port forwarding failed for listen " |
1009 | "port %d", options.remote_forwards[i].listen_port); | |
e0ae8728 | 1010 | } |
1011 | ||
396c147e | 1012 | static void |
5e96b616 | 1013 | ssh_control_listener(void) |
8ce64345 | 1014 | { |
5e96b616 | 1015 | struct sockaddr_un addr; |
1016 | mode_t old_umask; | |
4b5df124 | 1017 | int addr_len; |
1018 | ||
9dfd96d6 | 1019 | if (options.control_path == NULL || |
1020 | options.control_master == SSHCTL_MASTER_NO) | |
5e96b616 | 1021 | return; |
b5c334cc | 1022 | |
9dfd96d6 | 1023 | debug("setting up multiplex master socket"); |
1024 | ||
5e96b616 | 1025 | memset(&addr, '\0', sizeof(addr)); |
1026 | addr.sun_family = AF_UNIX; | |
4b5df124 | 1027 | addr_len = offsetof(struct sockaddr_un, sun_path) + |
5e96b616 | 1028 | strlen(options.control_path) + 1; |
8ce64345 | 1029 | |
5e96b616 | 1030 | if (strlcpy(addr.sun_path, options.control_path, |
1031 | sizeof(addr.sun_path)) >= sizeof(addr.sun_path)) | |
1032 | fatal("ControlPath too long"); | |
8ce64345 | 1033 | |
5e96b616 | 1034 | if ((control_fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) |
17318dd6 | 1035 | fatal("%s socket(): %s", __func__, strerror(errno)); |
5e96b616 | 1036 | |
1037 | old_umask = umask(0177); | |
4b5df124 | 1038 | if (bind(control_fd, (struct sockaddr*)&addr, addr_len) == -1) { |
5e96b616 | 1039 | control_fd = -1; |
05ada1a6 | 1040 | if (errno == EINVAL || errno == EADDRINUSE) |
5e96b616 | 1041 | fatal("ControlSocket %s already exists", |
1042 | options.control_path); | |
1043 | else | |
17318dd6 | 1044 | fatal("%s bind(): %s", __func__, strerror(errno)); |
8ce64345 | 1045 | } |
5e96b616 | 1046 | umask(old_umask); |
1047 | ||
1048 | if (listen(control_fd, 64) == -1) | |
17318dd6 | 1049 | fatal("%s listen(): %s", __func__, strerror(errno)); |
5e96b616 | 1050 | |
1051 | set_nonblock(control_fd); | |
1052 | } | |
1053 | ||
1054 | /* request pty/x11/agent/tcpfwd/shell for channel */ | |
1055 | static void | |
1056 | ssh_session2_setup(int id, void *arg) | |
1057 | { | |
1786be35 | 1058 | extern char **environ; |
9bf083eb | 1059 | const char *display; |
5e96b616 | 1060 | int interactive = tty_flag; |
9bf083eb | 1061 | |
56964485 | 1062 | display = getenv("DISPLAY"); |
9bf083eb | 1063 | if (options.forward_x11 && display != NULL) { |
b48eeb07 | 1064 | char *proto, *data; |
0b242b12 | 1065 | /* Get reasonable local authentication information. */ |
9bf083eb | 1066 | client_x11_get_proto(display, options.xauth_location, |
1067 | options.forward_x11_trusted, &proto, &data); | |
0b242b12 | 1068 | /* Request forwarding with authentication spoofing. */ |
1069 | debug("Requesting X11 forwarding with authentication spoofing."); | |
9bf083eb | 1070 | x11_request_forwarding_with_spoofing(id, display, proto, data); |
b5c334cc | 1071 | interactive = 1; |
0b242b12 | 1072 | /* XXX wait for reply */ |
1073 | } | |
1074 | ||
fa08c86b | 1075 | check_agent_present(); |
1076 | if (options.forward_agent) { | |
1077 | debug("Requesting authentication agent forwarding."); | |
1078 | channel_request_start(id, "auth-agent-req@openssh.com", 0); | |
1079 | packet_send(); | |
1080 | } | |
1081 | ||
a4f24bf8 | 1082 | if (options.tun_open != SSH_TUNMODE_NO) { |
d20f3c9e | 1083 | Channel *c; |
1084 | int fd; | |
1085 | ||
1086 | debug("Requesting tun."); | |
a4f24bf8 | 1087 | if ((fd = tun_open(options.tun_local, |
1088 | options.tun_open)) >= 0) { | |
d20f3c9e | 1089 | c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1, |
1090 | CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, | |
1091 | 0, "tun", 1); | |
1092 | c->datagram = 1; | |
e914f53a | 1093 | #if defined(SSH_TUN_FILTER) |
1094 | if (options.tun_open == SSH_TUNMODE_POINTOPOINT) | |
1095 | channel_register_filter(c->self, sys_tun_infilter, | |
1096 | sys_tun_outfilter); | |
1097 | #endif | |
d20f3c9e | 1098 | packet_start(SSH2_MSG_CHANNEL_OPEN); |
1099 | packet_put_cstring("tun@openssh.com"); | |
1100 | packet_put_int(c->self); | |
1101 | packet_put_int(c->local_window_max); | |
1102 | packet_put_int(c->local_maxpacket); | |
a4f24bf8 | 1103 | packet_put_int(options.tun_open); |
d20f3c9e | 1104 | packet_put_int(options.tun_remote); |
1105 | packet_send(); | |
1106 | } | |
1107 | } | |
1108 | ||
5e96b616 | 1109 | client_session2_setup(id, tty_flag, subsystem_flag, getenv("TERM"), |
1786be35 | 1110 | NULL, fileno(stdin), &command, environ, &ssh_subsystem_reply); |
1f3bf5aa | 1111 | |
b5c334cc | 1112 | packet_set_interactive(interactive); |
8ce64345 | 1113 | } |
1114 | ||
bcdb96c2 | 1115 | /* open new channel for a session */ |
396c147e | 1116 | static int |
bcdb96c2 | 1117 | ssh_session2_open(void) |
8ce64345 | 1118 | { |
719fc62f | 1119 | Channel *c; |
1120 | int window, packetmax, in, out, err; | |
2e73a022 | 1121 | |
14a9a859 | 1122 | if (stdin_null_flag) { |
5ca51e19 | 1123 | in = open(_PATH_DEVNULL, O_RDONLY); |
14a9a859 | 1124 | } else { |
1125 | in = dup(STDIN_FILENO); | |
1126 | } | |
2e73a022 | 1127 | out = dup(STDOUT_FILENO); |
1128 | err = dup(STDERR_FILENO); | |
8ce64345 | 1129 | |
1130 | if (in < 0 || out < 0 || err < 0) | |
14a9a859 | 1131 | fatal("dup() in/out/err failed"); |
8ce64345 | 1132 | |
a22aff1f | 1133 | /* enable nonblocking unless tty */ |
1134 | if (!isatty(in)) | |
1135 | set_nonblock(in); | |
1136 | if (!isatty(out)) | |
1137 | set_nonblock(out); | |
1138 | if (!isatty(err)) | |
1139 | set_nonblock(err); | |
1140 | ||
bcbf86ec | 1141 | window = CHAN_SES_WINDOW_DEFAULT; |
1142 | packetmax = CHAN_SES_PACKET_DEFAULT; | |
ea9700ba | 1143 | if (tty_flag) { |
1144 | window >>= 1; | |
1145 | packetmax >>= 1; | |
8ce64345 | 1146 | } |
719fc62f | 1147 | c = channel_new( |
8ce64345 | 1148 | "session", SSH_CHANNEL_OPENING, in, out, err, |
bcbf86ec | 1149 | window, packetmax, CHAN_EXTENDED_WRITE, |
0d942eff | 1150 | "client-session", /*nonblock*/0); |
8ce64345 | 1151 | |
bcdb96c2 | 1152 | debug3("ssh_session2_open: channel_new: %d", c->self); |
eb0dd41f | 1153 | |
36e1f6a1 | 1154 | channel_send_open(c->self); |
bcdb96c2 | 1155 | if (!no_shell_flag) |
5e96b616 | 1156 | channel_register_confirm(c->self, ssh_session2_setup, NULL); |
5260325f | 1157 | |
719fc62f | 1158 | return c->self; |
eb0dd41f | 1159 | } |
1160 | ||
396c147e | 1161 | static int |
eb0dd41f | 1162 | ssh_session2(void) |
1163 | { | |
bcdb96c2 | 1164 | int id = -1; |
eb0dd41f | 1165 | |
1166 | /* XXX should be pre-session */ | |
1167 | ssh_init_forwarding(); | |
5e96b616 | 1168 | ssh_control_listener(); |
eb0dd41f | 1169 | |
bcdb96c2 | 1170 | if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN)) |
1171 | id = ssh_session2_open(); | |
eb0dd41f | 1172 | |
d20f3c9e | 1173 | /* Execute a local command */ |
1174 | if (options.local_command != NULL && | |
1175 | options.permit_local_command) | |
1176 | ssh_local_cmd(options.local_command); | |
1177 | ||
eb0dd41f | 1178 | /* If requested, let ssh continue in the background. */ |
1179 | if (fork_after_authentication_flag) | |
1180 | if (daemon(1, 1) < 0) | |
1181 | fatal("daemon() failed: %.200s", strerror(errno)); | |
1182 | ||
4bf9c10e | 1183 | return client_loop(tty_flag, tty_flag ? |
1184 | options.escape_char : SSH_ESCAPECHAR_NONE, id); | |
8efc0c15 | 1185 | } |
fa08c86b | 1186 | |
396c147e | 1187 | static void |
fee56204 | 1188 | load_public_identity_files(void) |
1189 | { | |
1190 | char *filename; | |
2e23cde0 | 1191 | int i = 0; |
0659cace | 1192 | Key *public; |
383546c4 | 1193 | #ifdef SMARTCARD |
0659cace | 1194 | Key **keys; |
1195 | ||
9ff6f66f | 1196 | if (options.smartcard_device != NULL && |
0659cace | 1197 | options.num_identity_files < SSH_MAX_IDENTITY_FILES && |
1198 | (keys = sc_get_keys(options.smartcard_device, NULL)) != NULL ) { | |
1199 | int count = 0; | |
1200 | for (i = 0; keys[i] != NULL; i++) { | |
1201 | count++; | |
0659cace | 1202 | memmove(&options.identity_files[1], &options.identity_files[0], |
1203 | sizeof(char *) * (SSH_MAX_IDENTITY_FILES - 1)); | |
1204 | memmove(&options.identity_keys[1], &options.identity_keys[0], | |
1205 | sizeof(Key *) * (SSH_MAX_IDENTITY_FILES - 1)); | |
1206 | options.num_identity_files++; | |
1207 | options.identity_keys[0] = keys[i]; | |
244e796f | 1208 | options.identity_files[0] = sc_get_key_label(keys[i]); |
0659cace | 1209 | } |
1c2deed1 | 1210 | if (options.num_identity_files > SSH_MAX_IDENTITY_FILES) |
1211 | options.num_identity_files = SSH_MAX_IDENTITY_FILES; | |
0659cace | 1212 | i = count; |
1213 | xfree(keys); | |
383546c4 | 1214 | } |
3e984472 | 1215 | #endif /* SMARTCARD */ |
2e23cde0 | 1216 | for (; i < options.num_identity_files; i++) { |
1217 | filename = tilde_expand_filename(options.identity_files[i], | |
1218 | original_real_uid); | |
1219 | public = key_load_public(filename, NULL); | |
1220 | debug("identity file %s type %d", filename, | |
1221 | public ? public->type : -1); | |
1222 | xfree(options.identity_files[i]); | |
1223 | options.identity_files[i] = filename; | |
1224 | options.identity_keys[i] = public; | |
1225 | } | |
fee56204 | 1226 | } |
5e96b616 | 1227 | |
1228 | static void | |
1229 | control_client_sighandler(int signo) | |
1230 | { | |
1231 | control_client_terminate = signo; | |
1232 | } | |
1233 | ||
1234 | static void | |
1235 | control_client_sigrelay(int signo) | |
1236 | { | |
1237 | if (control_server_pid > 1) | |
1238 | kill(control_server_pid, signo); | |
1239 | } | |
1240 | ||
67a08279 | 1241 | static int |
1242 | env_permitted(char *env) | |
1243 | { | |
1244 | int i; | |
1245 | char name[1024], *cp; | |
1246 | ||
1247 | strlcpy(name, env, sizeof(name)); | |
1248 | if ((cp = strchr(name, '=')) == NULL) | |
1249 | return (0); | |
1250 | ||
1251 | *cp = '\0'; | |
1252 | ||
1253 | for (i = 0; i < options.num_send_env; i++) | |
1254 | if (match_pattern(name, options.send_env[i])) | |
1255 | return (1); | |
1256 | ||
1257 | return (0); | |
1258 | } | |
1259 | ||
5e96b616 | 1260 | static void |
1261 | control_client(const char *path) | |
1262 | { | |
1263 | struct sockaddr_un addr; | |
a7e124fe | 1264 | int i, r, fd, sock, exitval, num_env, addr_len; |
5e96b616 | 1265 | Buffer m; |
f8c6db83 | 1266 | char *term; |
1786be35 | 1267 | extern char **environ; |
f8c6db83 | 1268 | u_int flags; |
f2107e97 | 1269 | |
9dfd96d6 | 1270 | if (mux_command == 0) |
1271 | mux_command = SSHMUX_COMMAND_OPEN; | |
1272 | ||
1273 | switch (options.control_master) { | |
1274 | case SSHCTL_MASTER_AUTO: | |
1275 | case SSHCTL_MASTER_AUTO_ASK: | |
1276 | debug("auto-mux: Trying existing master"); | |
1277 | /* FALLTHROUGH */ | |
1278 | case SSHCTL_MASTER_NO: | |
1279 | break; | |
1280 | default: | |
1281 | return; | |
1282 | } | |
1283 | ||
5e96b616 | 1284 | memset(&addr, '\0', sizeof(addr)); |
1285 | addr.sun_family = AF_UNIX; | |
4b5df124 | 1286 | addr_len = offsetof(struct sockaddr_un, sun_path) + |
5e96b616 | 1287 | strlen(path) + 1; |
1288 | ||
1289 | if (strlcpy(addr.sun_path, path, | |
1290 | sizeof(addr.sun_path)) >= sizeof(addr.sun_path)) | |
1291 | fatal("ControlPath too long"); | |
1292 | ||
1293 | if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) | |
1294 | fatal("%s socket(): %s", __func__, strerror(errno)); | |
1295 | ||
cc8ca1e6 | 1296 | if (connect(sock, (struct sockaddr*)&addr, addr_len) == -1) { |
19186c3d | 1297 | if (mux_command != SSHMUX_COMMAND_OPEN) { |
1298 | fatal("Control socket connect(%.100s): %s", path, | |
1299 | strerror(errno)); | |
1300 | } | |
f6740270 | 1301 | if (errno == ENOENT) |
1302 | debug("Control socket \"%.100s\" does not exist", path); | |
1303 | else { | |
1304 | error("Control socket connect(%.100s): %s", path, | |
1305 | strerror(errno)); | |
1306 | } | |
ef07103c | 1307 | close(sock); |
1308 | return; | |
1309 | } | |
56964485 | 1310 | |
ef07103c | 1311 | if (stdin_null_flag) { |
1312 | if ((fd = open(_PATH_DEVNULL, O_RDONLY)) == -1) | |
1313 | fatal("open(/dev/null): %s", strerror(errno)); | |
1314 | if (dup2(fd, STDIN_FILENO) == -1) | |
1315 | fatal("dup2: %s", strerror(errno)); | |
1316 | if (fd > STDERR_FILENO) | |
1317 | close(fd); | |
1318 | } | |
56964485 | 1319 | |
ef07103c | 1320 | term = getenv("TERM"); |
f8c6db83 | 1321 | |
1322 | flags = 0; | |
1323 | if (tty_flag) | |
1324 | flags |= SSHMUX_FLAG_TTY; | |
1325 | if (subsystem_flag) | |
1326 | flags |= SSHMUX_FLAG_SUBSYS; | |
ef07103c | 1327 | if (options.forward_x11) |
1328 | flags |= SSHMUX_FLAG_X11_FWD; | |
1329 | if (options.forward_agent) | |
1330 | flags |= SSHMUX_FLAG_AGENT_FWD; | |
5e96b616 | 1331 | |
5e96b616 | 1332 | buffer_init(&m); |
1333 | ||
f8c6db83 | 1334 | /* Send our command to server */ |
1335 | buffer_put_int(&m, mux_command); | |
1336 | buffer_put_int(&m, flags); | |
ef07103c | 1337 | if (ssh_msg_send(sock, SSHMUX_VER, &m) == -1) |
f8c6db83 | 1338 | fatal("%s: msg_send", __func__); |
1339 | buffer_clear(&m); | |
1340 | ||
1341 | /* Get authorisation status and PID of controlee */ | |
5e96b616 | 1342 | if (ssh_msg_recv(sock, &m) == -1) |
1343 | fatal("%s: msg_recv", __func__); | |
ef07103c | 1344 | if (buffer_get_char(&m) != SSHMUX_VER) |
5e96b616 | 1345 | fatal("%s: wrong version", __func__); |
0d34d6ce | 1346 | if (buffer_get_int(&m) != 1) |
1347 | fatal("Connection to master denied"); | |
5e96b616 | 1348 | control_server_pid = buffer_get_int(&m); |
1349 | ||
5e96b616 | 1350 | buffer_clear(&m); |
5e96b616 | 1351 | |
f8c6db83 | 1352 | switch (mux_command) { |
1353 | case SSHMUX_COMMAND_ALIVE_CHECK: | |
f8cc7664 | 1354 | fprintf(stderr, "Master running (pid=%d)\r\n", |
f8c6db83 | 1355 | control_server_pid); |
1356 | exit(0); | |
1357 | case SSHMUX_COMMAND_TERMINATE: | |
1358 | fprintf(stderr, "Exit request sent.\r\n"); | |
1359 | exit(0); | |
1360 | case SSHMUX_COMMAND_OPEN: | |
1361 | /* continue below */ | |
1362 | break; | |
1363 | default: | |
1364 | fatal("silly mux_command %d", mux_command); | |
1365 | } | |
1366 | ||
1367 | /* SSHMUX_COMMAND_OPEN */ | |
ef07103c | 1368 | buffer_put_cstring(&m, term ? term : ""); |
5e96b616 | 1369 | buffer_append(&command, "\0", 1); |
1370 | buffer_put_cstring(&m, buffer_ptr(&command)); | |
1371 | ||
67a08279 | 1372 | if (options.num_send_env == 0 || environ == NULL) { |
1373 | buffer_put_int(&m, 0); | |
f2107e97 | 1374 | } else { |
67a08279 | 1375 | /* Pass environment */ |
1376 | num_env = 0; | |
1377 | for (i = 0; environ[i] != NULL; i++) | |
1378 | if (env_permitted(environ[i])) | |
1379 | num_env++; /* Count */ | |
f2107e97 | 1380 | |
67a08279 | 1381 | buffer_put_int(&m, num_env); |
1382 | ||
77c50919 | 1383 | for (i = 0; environ[i] != NULL && num_env >= 0; i++) |
1384 | if (env_permitted(environ[i])) { | |
1385 | num_env--; | |
67a08279 | 1386 | buffer_put_cstring(&m, environ[i]); |
77c50919 | 1387 | } |
67a08279 | 1388 | } |
1786be35 | 1389 | |
ef07103c | 1390 | if (ssh_msg_send(sock, SSHMUX_VER, &m) == -1) |
5e96b616 | 1391 | fatal("%s: msg_send", __func__); |
1392 | ||
1393 | mm_send_fd(sock, STDIN_FILENO); | |
1394 | mm_send_fd(sock, STDOUT_FILENO); | |
1395 | mm_send_fd(sock, STDERR_FILENO); | |
1396 | ||
1397 | /* Wait for reply, so master has a chance to gather ttymodes */ | |
1398 | buffer_clear(&m); | |
1399 | if (ssh_msg_recv(sock, &m) == -1) | |
1400 | fatal("%s: msg_recv", __func__); | |
ef07103c | 1401 | if (buffer_get_char(&m) != SSHMUX_VER) |
f8c6db83 | 1402 | fatal("%s: wrong version", __func__); |
5e96b616 | 1403 | buffer_free(&m); |
1404 | ||
d3e5d1e9 | 1405 | signal(SIGHUP, control_client_sighandler); |
78d2b454 | 1406 | signal(SIGINT, control_client_sighandler); |
1407 | signal(SIGTERM, control_client_sighandler); | |
1408 | signal(SIGWINCH, control_client_sigrelay); | |
1409 | ||
5e96b616 | 1410 | if (tty_flag) |
1411 | enter_raw_mode(); | |
1412 | ||
1413 | /* Stick around until the controlee closes the client_fd */ | |
1414 | exitval = 0; | |
1415 | for (;!control_client_terminate;) { | |
1416 | r = read(sock, &exitval, sizeof(exitval)); | |
1417 | if (r == 0) { | |
1418 | debug2("Received EOF from master"); | |
1419 | break; | |
1420 | } | |
1421 | if (r > 0) | |
1422 | debug2("Received exit status from master %d", exitval); | |
1423 | if (r == -1 && errno != EINTR) | |
1424 | fatal("%s: read %s", __func__, strerror(errno)); | |
1425 | } | |
1426 | ||
1427 | if (control_client_terminate) | |
1428 | debug2("Exiting on signal %d", control_client_terminate); | |
1429 | ||
1430 | close(sock); | |
1431 | ||
1432 | leave_raw_mode(); | |
1433 | ||
1434 | if (tty_flag && options.log_level != SYSLOG_LEVEL_QUIET) | |
1435 | fprintf(stderr, "Connection to master closed.\r\n"); | |
1436 | ||
1437 | exit(exitval); | |
1438 | } |