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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" | |
85ac7a84 | 43 | RCSID("$OpenBSD: ssh.c,v 1.209 2004/03/11 10:21:17 markus Exp $"); |
8efc0c15 | 44 | |
a306f2dd | 45 | #include <openssl/evp.h> |
fa08c86b | 46 | #include <openssl/err.h> |
a306f2dd | 47 | |
8efc0c15 | 48 | #include "ssh.h" |
42f11eb2 | 49 | #include "ssh1.h" |
50 | #include "ssh2.h" | |
51 | #include "compat.h" | |
52 | #include "cipher.h" | |
53 | #include "xmalloc.h" | |
8efc0c15 | 54 | #include "packet.h" |
55 | #include "buffer.h" | |
a5efa1bb | 56 | #include "channels.h" |
a306f2dd | 57 | #include "key.h" |
4c8722d9 | 58 | #include "authfd.h" |
a306f2dd | 59 | #include "authfile.h" |
42f11eb2 | 60 | #include "pathnames.h" |
b5c334cc | 61 | #include "clientloop.h" |
42f11eb2 | 62 | #include "log.h" |
63 | #include "readconf.h" | |
64 | #include "sshconnect.h" | |
65 | #include "tildexpand.h" | |
1f3bf5aa | 66 | #include "dispatch.h" |
42f11eb2 | 67 | #include "misc.h" |
b2552997 | 68 | #include "kex.h" |
69 | #include "mac.h" | |
30dcc918 | 70 | #include "sshtty.h" |
8efc0c15 | 71 | |
383546c4 | 72 | #ifdef SMARTCARD |
383546c4 | 73 | #include "scard.h" |
dd2495cb | 74 | #endif |
383546c4 | 75 | |
f601d847 | 76 | #ifdef HAVE___PROGNAME |
77 | extern char *__progname; | |
260d427b | 78 | #else |
79 | char *__progname; | |
80 | #endif | |
f601d847 | 81 | |
5260325f | 82 | /* Flag indicating whether debug mode is on. This can be set on the command line. */ |
8efc0c15 | 83 | int debug_flag = 0; |
84 | ||
a8be9f80 | 85 | /* Flag indicating whether a tty should be allocated */ |
8efc0c15 | 86 | int tty_flag = 0; |
8abcdba4 | 87 | int no_tty_flag = 0; |
88 | int force_tty_flag = 0; | |
8efc0c15 | 89 | |
8ce64345 | 90 | /* don't exec a shell */ |
91 | int no_shell_flag = 0; | |
8ce64345 | 92 | |
aa3378df | 93 | /* |
94 | * Flag indicating that nothing should be read from stdin. This can be set | |
95 | * on the command line. | |
96 | */ | |
8efc0c15 | 97 | int stdin_null_flag = 0; |
98 | ||
aa3378df | 99 | /* |
100 | * Flag indicating that ssh should fork after authentication. This is useful | |
c242fc96 | 101 | * so that the passphrase can be entered manually, and then ssh goes to the |
aa3378df | 102 | * background. |
103 | */ | |
8efc0c15 | 104 | int fork_after_authentication_flag = 0; |
105 | ||
aa3378df | 106 | /* |
107 | * General data structure for command line options and options configurable | |
108 | * in configuration files. See readconf.h. | |
109 | */ | |
8efc0c15 | 110 | Options options; |
111 | ||
e591b98a | 112 | /* optional user configfile */ |
113 | char *config = NULL; | |
114 | ||
aa3378df | 115 | /* |
116 | * Name of the host we are connecting to. This is the name given on the | |
117 | * command line, or the HostName specified for the user-supplied name in a | |
118 | * configuration file. | |
119 | */ | |
8efc0c15 | 120 | char *host; |
121 | ||
122 | /* socket address the host resolves to */ | |
48e671d5 | 123 | struct sockaddr_storage hostaddr; |
8efc0c15 | 124 | |
8002af61 | 125 | /* Private host keys. */ |
39c00dc2 | 126 | Sensitive sensitive_data; |
8efc0c15 | 127 | |
128 | /* Original real UID. */ | |
129 | uid_t original_real_uid; | |
3fb156df | 130 | uid_t original_effective_uid; |
8efc0c15 | 131 | |
8ce64345 | 132 | /* command to be executed */ |
133 | Buffer command; | |
134 | ||
ae810de7 | 135 | /* Should we execute a command or invoke a subsystem? */ |
136 | int subsystem_flag = 0; | |
137 | ||
e0ae8728 | 138 | /* # of replies received for global requests */ |
139 | static int client_global_request_id = 0; | |
140 | ||
6939bbd4 | 141 | /* pid of proxycommand child process */ |
142 | pid_t proxy_command_pid = 0; | |
143 | ||
8efc0c15 | 144 | /* Prints a help message to the user. This function never returns. */ |
145 | ||
396c147e | 146 | static void |
5ca51e19 | 147 | usage(void) |
8efc0c15 | 148 | { |
182ccbba | 149 | fprintf(stderr, |
150 | "usage: ssh [-1246AaCfghkNnqsTtVvXxY] [-b bind_address] [-c cipher_spec]\n" | |
151 | " [-D port] [-e escape_char] [-F configfile] [-i identity_file]\n" | |
152 | " [-L port:host:hostport] [-l login_name] [-m mac_spec] [-o option]\n" | |
153 | " [-p port] [-R port:host:hostport] [user@]hostname [command]\n" | |
154 | ); | |
5260325f | 155 | exit(1); |
8efc0c15 | 156 | } |
157 | ||
396c147e | 158 | static int ssh_session(void); |
159 | static int ssh_session2(void); | |
160 | static void load_public_identity_files(void); | |
8ce64345 | 161 | |
5260325f | 162 | /* |
163 | * Main program for the ssh client. | |
164 | */ | |
8efc0c15 | 165 | int |
166 | main(int ac, char **av) | |
167 | { | |
b34bec32 | 168 | int i, opt, exit_status; |
57112b5a | 169 | u_short fwd_port, fwd_host_port; |
d2e3df16 | 170 | char sfwd_port[6], sfwd_host_port[6]; |
1aafd17a | 171 | char *p, *cp, *line, buf[256]; |
5260325f | 172 | struct stat st; |
3b1a83df | 173 | struct passwd *pw; |
8ce64345 | 174 | int dummy; |
57dade33 | 175 | extern int optind, optreset; |
1812a662 | 176 | extern char *optarg; |
5260325f | 177 | |
fda04d7d | 178 | __progname = ssh_get_progname(av[0]); |
264dce47 | 179 | init_rng(); |
180 | ||
aa3378df | 181 | /* |
182 | * Save the original real uid. It will be needed later (uid-swapping | |
183 | * may clobber the real uid). | |
184 | */ | |
5260325f | 185 | original_real_uid = getuid(); |
186 | original_effective_uid = geteuid(); | |
aff51935 | 187 | |
9f324470 | 188 | /* |
189 | * Use uid-swapping to give up root privileges for the duration of | |
190 | * option processing. We will re-instantiate the rights when we are | |
191 | * ready to create the privileged port, and will permanently drop | |
192 | * them when the port has been created (actually, when the connection | |
193 | * has been made, as we may need to create the port several times). | |
194 | */ | |
195 | PRIV_END; | |
5260325f | 196 | |
7322ef0e | 197 | #ifdef HAVE_SETRLIMIT |
5260325f | 198 | /* If we are installed setuid root be careful to not drop core. */ |
199 | if (original_real_uid != original_effective_uid) { | |
200 | struct rlimit rlim; | |
201 | rlim.rlim_cur = rlim.rlim_max = 0; | |
202 | if (setrlimit(RLIMIT_CORE, &rlim) < 0) | |
203 | fatal("setrlimit failed: %.100s", strerror(errno)); | |
8efc0c15 | 204 | } |
3c62e7eb | 205 | #endif |
63bd8c36 | 206 | /* Get user data. */ |
207 | pw = getpwuid(original_real_uid); | |
208 | if (!pw) { | |
bbe88b6d | 209 | logit("You don't exist, go away!"); |
63bd8c36 | 210 | exit(1); |
211 | } | |
212 | /* Take a copy of the returned structure. */ | |
213 | pw = pwcopy(pw); | |
214 | ||
aa3378df | 215 | /* |
216 | * Set our umask to something reasonable, as some files are created | |
217 | * with the default umask. This will make them world-readable but | |
218 | * writable only by the owner, which is ok for all files for which we | |
219 | * don't set the modes explicitly. | |
220 | */ | |
5260325f | 221 | umask(022); |
222 | ||
5260325f | 223 | /* Initialize option structure to indicate that no values have been set. */ |
224 | initialize_options(&options); | |
225 | ||
226 | /* Parse command-line arguments. */ | |
227 | host = NULL; | |
228 | ||
f5a1a01a | 229 | again: |
230 | while ((opt = getopt(ac, av, | |
d73a67d7 | 231 | "1246ab:c:e:fgi:kl:m:no:p:qstvxACD:F:I:L:NPR:TVXY")) != -1) { |
5260325f | 232 | switch (opt) { |
1f3bf5aa | 233 | case '1': |
234 | options.protocol = SSH_PROTO_1; | |
235 | break; | |
6ae2364d | 236 | case '2': |
237 | options.protocol = SSH_PROTO_2; | |
238 | break; | |
48e671d5 | 239 | case '4': |
1572b90f | 240 | options.address_family = AF_INET; |
48e671d5 | 241 | break; |
48e671d5 | 242 | case '6': |
1572b90f | 243 | options.address_family = AF_INET6; |
48e671d5 | 244 | break; |
5260325f | 245 | case 'n': |
246 | stdin_null_flag = 1; | |
247 | break; | |
5260325f | 248 | case 'f': |
249 | fork_after_authentication_flag = 1; | |
250 | stdin_null_flag = 1; | |
251 | break; | |
5260325f | 252 | case 'x': |
253 | options.forward_x11 = 0; | |
254 | break; | |
5260325f | 255 | case 'X': |
256 | options.forward_x11 = 1; | |
257 | break; | |
d73a67d7 | 258 | case 'Y': |
259 | options.forward_x11 = 1; | |
260 | options.forward_x11_trusted = 1; | |
261 | break; | |
5260325f | 262 | case 'g': |
263 | options.gateway_ports = 1; | |
264 | break; | |
e59404d1 | 265 | case 'P': /* deprecated */ |
5260325f | 266 | options.use_privileged_port = 0; |
267 | break; | |
5260325f | 268 | case 'a': |
269 | options.forward_agent = 0; | |
270 | break; | |
71276795 | 271 | case 'A': |
272 | options.forward_agent = 1; | |
273 | break; | |
5260325f | 274 | case 'k': |
f7926e97 | 275 | options.gss_deleg_creds = 0; |
5260325f | 276 | break; |
5260325f | 277 | case 'i': |
278 | if (stat(optarg, &st) < 0) { | |
f5a1a01a | 279 | fprintf(stderr, "Warning: Identity file %s " |
280 | "does not exist.\n", optarg); | |
5260325f | 281 | break; |
282 | } | |
f5a1a01a | 283 | if (options.num_identity_files >= |
284 | SSH_MAX_IDENTITY_FILES) | |
285 | fatal("Too many identity files specified " | |
286 | "(max %d)", SSH_MAX_IDENTITY_FILES); | |
287 | options.identity_files[options.num_identity_files++] = | |
288 | xstrdup(optarg); | |
5260325f | 289 | break; |
383546c4 | 290 | case 'I': |
291 | #ifdef SMARTCARD | |
9ff6f66f | 292 | options.smartcard_device = xstrdup(optarg); |
dd2495cb | 293 | #else |
383546c4 | 294 | fprintf(stderr, "no support for smartcards.\n"); |
dd2495cb | 295 | #endif |
383546c4 | 296 | break; |
5260325f | 297 | case 't': |
8abcdba4 | 298 | if (tty_flag) |
299 | force_tty_flag = 1; | |
5260325f | 300 | tty_flag = 1; |
301 | break; | |
5260325f | 302 | case 'v': |
e053cd2c | 303 | if (debug_flag == 0) { |
bcbf86ec | 304 | debug_flag = 1; |
305 | options.log_level = SYSLOG_LEVEL_DEBUG1; | |
e053cd2c | 306 | } else { |
307 | if (options.log_level < SYSLOG_LEVEL_DEBUG3) | |
308 | options.log_level++; | |
bcbf86ec | 309 | break; |
e053cd2c | 310 | } |
bcbf86ec | 311 | /* fallthrough */ |
5260325f | 312 | case 'V': |
85ac7a84 | 313 | fprintf(stderr, "%s, %s\n", |
314 | SSH_VERSION, SSLeay_version(SSLEAY_VERSION)); | |
5260325f | 315 | if (opt == 'V') |
316 | exit(0); | |
5260325f | 317 | break; |
5260325f | 318 | case 'q': |
319 | options.log_level = SYSLOG_LEVEL_QUIET; | |
320 | break; | |
5260325f | 321 | case 'e': |
322 | if (optarg[0] == '^' && optarg[2] == 0 && | |
f5a1a01a | 323 | (u_char) optarg[1] >= 64 && |
324 | (u_char) optarg[1] < 128) | |
1e3b8b07 | 325 | options.escape_char = (u_char) optarg[1] & 31; |
5260325f | 326 | else if (strlen(optarg) == 1) |
1e3b8b07 | 327 | options.escape_char = (u_char) optarg[0]; |
5260325f | 328 | else if (strcmp(optarg, "none") == 0) |
4bf9c10e | 329 | options.escape_char = SSH_ESCAPECHAR_NONE; |
5260325f | 330 | else { |
f5a1a01a | 331 | fprintf(stderr, "Bad escape character '%s'.\n", |
332 | optarg); | |
5260325f | 333 | exit(1); |
334 | } | |
335 | break; | |
5260325f | 336 | case 'c': |
a306f2dd | 337 | if (ciphers_valid(optarg)) { |
338 | /* SSH2 only */ | |
339 | options.ciphers = xstrdup(optarg); | |
d0c832f3 | 340 | options.cipher = SSH_CIPHER_ILLEGAL; |
a306f2dd | 341 | } else { |
342 | /* SSH1 only */ | |
c523303b | 343 | options.cipher = cipher_number(optarg); |
344 | if (options.cipher == -1) { | |
f5a1a01a | 345 | fprintf(stderr, |
346 | "Unknown cipher type '%s'\n", | |
347 | optarg); | |
a306f2dd | 348 | exit(1); |
349 | } | |
f5a1a01a | 350 | if (options.cipher == SSH_CIPHER_3DES) |
c523303b | 351 | options.ciphers = "3des-cbc"; |
f5a1a01a | 352 | else if (options.cipher == SSH_CIPHER_BLOWFISH) |
c523303b | 353 | options.ciphers = "blowfish-cbc"; |
f5a1a01a | 354 | else |
c523303b | 355 | options.ciphers = (char *)-1; |
5260325f | 356 | } |
357 | break; | |
b2552997 | 358 | case 'm': |
359 | if (mac_valid(optarg)) | |
360 | options.macs = xstrdup(optarg); | |
361 | else { | |
f5a1a01a | 362 | fprintf(stderr, "Unknown mac type '%s'\n", |
363 | optarg); | |
b2552997 | 364 | exit(1); |
365 | } | |
366 | break; | |
5260325f | 367 | case 'p': |
2d2a2c65 | 368 | options.port = a2port(optarg); |
369 | if (options.port == 0) { | |
6031af8d | 370 | fprintf(stderr, "Bad port '%s'\n", optarg); |
371 | exit(1); | |
372 | } | |
5260325f | 373 | break; |
5260325f | 374 | case 'l': |
375 | options.user = optarg; | |
376 | break; | |
d2e3df16 | 377 | |
378 | case 'L': | |
5260325f | 379 | case 'R': |
fa065de2 | 380 | if (sscanf(optarg, "%5[0123456789]:%255[^:]:%5[0123456789]", |
d2e3df16 | 381 | sfwd_port, buf, sfwd_host_port) != 3 && |
fa065de2 | 382 | sscanf(optarg, "%5[0123456789]/%255[^/]/%5[0123456789]", |
d2e3df16 | 383 | sfwd_port, buf, sfwd_host_port) != 3) { |
f5a1a01a | 384 | fprintf(stderr, |
d2e3df16 | 385 | "Bad forwarding specification '%s'\n", |
f5a1a01a | 386 | optarg); |
5260325f | 387 | usage(); |
388 | /* NOTREACHED */ | |
389 | } | |
d2e3df16 | 390 | if ((fwd_port = a2port(sfwd_port)) == 0 || |
762715ce | 391 | (fwd_host_port = a2port(sfwd_host_port)) == 0) { |
f5a1a01a | 392 | fprintf(stderr, |
d2e3df16 | 393 | "Bad forwarding port(s) '%s'\n", optarg); |
394 | exit(1); | |
5260325f | 395 | } |
d2e3df16 | 396 | if (opt == 'L') |
397 | add_local_forward(&options, fwd_port, buf, | |
398 | fwd_host_port); | |
399 | else if (opt == 'R') | |
400 | add_remote_forward(&options, fwd_port, buf, | |
184eed6a | 401 | fwd_host_port); |
5260325f | 402 | break; |
0490e609 | 403 | |
404 | case 'D': | |
2d2a2c65 | 405 | fwd_port = a2port(optarg); |
406 | if (fwd_port == 0) { | |
f5a1a01a | 407 | fprintf(stderr, "Bad dynamic port '%s'\n", |
408 | optarg); | |
6031af8d | 409 | exit(1); |
410 | } | |
37ba5172 | 411 | add_local_forward(&options, fwd_port, "socks", 0); |
0490e609 | 412 | break; |
413 | ||
5260325f | 414 | case 'C': |
415 | options.compression = 1; | |
416 | break; | |
8ce64345 | 417 | case 'N': |
418 | no_shell_flag = 1; | |
419 | no_tty_flag = 1; | |
420 | break; | |
8ce64345 | 421 | case 'T': |
422 | no_tty_flag = 1; | |
423 | break; | |
5260325f | 424 | case 'o': |
425 | dummy = 1; | |
1aafd17a | 426 | line = xstrdup(optarg); |
f5a1a01a | 427 | if (process_config_line(&options, host ? host : "", |
1aafd17a | 428 | line, "command-line", 0, &dummy) != 0) |
5260325f | 429 | exit(1); |
1aafd17a | 430 | xfree(line); |
5260325f | 431 | break; |
ae810de7 | 432 | case 's': |
433 | subsystem_flag = 1; | |
434 | break; | |
3435f5a6 | 435 | case 'b': |
436 | options.bind_address = optarg; | |
437 | break; | |
e591b98a | 438 | case 'F': |
439 | config = optarg; | |
440 | break; | |
5260325f | 441 | default: |
442 | usage(); | |
443 | } | |
444 | } | |
445 | ||
f5a1a01a | 446 | ac -= optind; |
447 | av += optind; | |
448 | ||
449 | if (ac > 0 && !host && **av != '-') { | |
15748b4d | 450 | if (strrchr(*av, '@')) { |
f5a1a01a | 451 | p = xstrdup(*av); |
15748b4d | 452 | cp = strrchr(p, '@'); |
f5a1a01a | 453 | if (cp == NULL || cp == p) |
454 | usage(); | |
455 | options.user = p; | |
456 | *cp = '\0'; | |
457 | host = ++cp; | |
458 | } else | |
459 | host = *av; | |
978ebf99 | 460 | if (ac > 1) { |
461 | optind = optreset = 1; | |
f5a1a01a | 462 | goto again; |
463 | } | |
978ebf99 | 464 | ac--, av++; |
f5a1a01a | 465 | } |
466 | ||
5260325f | 467 | /* Check that we got a host name. */ |
468 | if (!host) | |
8efc0c15 | 469 | usage(); |
5260325f | 470 | |
22d89d24 | 471 | SSLeay_add_all_algorithms(); |
fa08c86b | 472 | ERR_load_crypto_strings(); |
22d89d24 | 473 | |
5260325f | 474 | /* Initialize the command to execute on remote host. */ |
475 | buffer_init(&command); | |
476 | ||
aa3378df | 477 | /* |
478 | * Save the command to execute on the remote host in a buffer. There | |
479 | * is no limit on the length of the command, except by the maximum | |
480 | * packet size. Also sets the tty flag if there is no command. | |
481 | */ | |
f5a1a01a | 482 | if (!ac) { |
5260325f | 483 | /* No command specified - execute shell on a tty. */ |
484 | tty_flag = 1; | |
ae810de7 | 485 | if (subsystem_flag) { |
f5a1a01a | 486 | fprintf(stderr, |
487 | "You must specify a subsystem to invoke.\n"); | |
ae810de7 | 488 | usage(); |
489 | } | |
5260325f | 490 | } else { |
f5a1a01a | 491 | /* A command has been specified. Store it into the buffer. */ |
492 | for (i = 0; i < ac; i++) { | |
493 | if (i) | |
5260325f | 494 | buffer_append(&command, " ", 1); |
495 | buffer_append(&command, av[i], strlen(av[i])); | |
496 | } | |
8efc0c15 | 497 | } |
5260325f | 498 | |
499 | /* Cannot fork to background if no command. */ | |
14a9a859 | 500 | if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag) |
5260325f | 501 | fatal("Cannot fork into background without a command to execute."); |
502 | ||
503 | /* Allocate a tty by default if no command specified. */ | |
504 | if (buffer_len(&command) == 0) | |
505 | tty_flag = 1; | |
506 | ||
343288b8 | 507 | /* Force no tty */ |
0b6fbf03 | 508 | if (no_tty_flag) |
509 | tty_flag = 0; | |
5260325f | 510 | /* Do not allocate a tty if stdin is not a tty. */ |
8abcdba4 | 511 | if (!isatty(fileno(stdin)) && !force_tty_flag) { |
5260325f | 512 | if (tty_flag) |
bbe88b6d | 513 | logit("Pseudo-terminal will not be allocated because stdin is not a terminal."); |
5260325f | 514 | tty_flag = 0; |
515 | } | |
8ce64345 | 516 | |
20244695 | 517 | /* |
518 | * Initialize "log" output. Since we are the client all output | |
519 | * actually goes to stderr. | |
520 | */ | |
cc44f691 | 521 | log_init(av[0], options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level, |
522 | SYSLOG_FACILITY_USER, 1); | |
5260325f | 523 | |
e591b98a | 524 | /* |
525 | * Read per-user configuration file. Ignore the system wide config | |
526 | * file if the user specifies a config file on the command line. | |
527 | */ | |
528 | if (config != NULL) { | |
93111dfa | 529 | if (!read_config_file(config, host, &options)) |
530 | fatal("Can't open user config file %.100s: " | |
531 | "%.100s", config, strerror(errno)); | |
e591b98a | 532 | } else { |
533 | snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, | |
534 | _PATH_SSH_USER_CONFFILE); | |
f67792f2 | 535 | (void)read_config_file(buf, host, &options); |
e591b98a | 536 | |
f67792f2 | 537 | /* Read systemwide configuration file after use config. */ |
93111dfa | 538 | (void)read_config_file(_PATH_HOST_CONFIG_FILE, host, &options); |
e591b98a | 539 | } |
5260325f | 540 | |
541 | /* Fill configuration defaults. */ | |
542 | fill_default_options(&options); | |
543 | ||
1572b90f | 544 | channel_set_af(options.address_family); |
545 | ||
5260325f | 546 | /* reinit */ |
20244695 | 547 | log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 1); |
5260325f | 548 | |
e339aa53 | 549 | seed_rng(); |
550 | ||
5260325f | 551 | if (options.user == NULL) |
552 | options.user = xstrdup(pw->pw_name); | |
553 | ||
554 | if (options.hostname != NULL) | |
555 | host = options.hostname; | |
556 | ||
03c82656 | 557 | /* force lowercase for hostkey matching */ |
558 | if (options.host_key_alias != NULL) { | |
559 | for (p = options.host_key_alias; *p; p++) | |
560 | if (isupper(*p)) | |
561 | *p = tolower(*p); | |
562 | } | |
563 | ||
f78bde70 | 564 | if (options.proxy_command != NULL && |
565 | strcmp(options.proxy_command, "none") == 0) | |
566 | options.proxy_command = NULL; | |
567 | ||
6ffc9c88 | 568 | /* Open a connection to the remote host. */ |
1572b90f | 569 | if (ssh_connect(host, &hostaddr, options.port, |
570 | options.address_family, options.connection_attempts, | |
d514c907 | 571 | #ifdef HAVE_CYGWIN |
572 | options.use_privileged_port, | |
573 | #else | |
3fb156df | 574 | original_effective_uid == 0 && options.use_privileged_port, |
d514c907 | 575 | #endif |
de60473e | 576 | options.proxy_command) != 0) |
b34bec32 | 577 | exit(1); |
5260325f | 578 | |
aa3378df | 579 | /* |
580 | * If we successfully made the connection, load the host private key | |
581 | * in case we will need it later for combined rsa-rhosts | |
582 | * authentication. This must be done before releasing extra | |
583 | * privileges, because the file is only readable by root. | |
78660ed4 | 584 | * If we cannot access the private keys, load the public keys |
585 | * instead and try to execute the ssh-keysign helper instead. | |
aa3378df | 586 | */ |
8002af61 | 587 | sensitive_data.nkeys = 0; |
588 | sensitive_data.keys = NULL; | |
39c00dc2 | 589 | sensitive_data.external_keysign = 0; |
b34bec32 | 590 | if (options.rhosts_rsa_authentication || |
591 | options.hostbased_authentication) { | |
8002af61 | 592 | sensitive_data.nkeys = 3; |
343288b8 | 593 | sensitive_data.keys = xmalloc(sensitive_data.nkeys * |
594 | sizeof(Key)); | |
3fb156df | 595 | |
596 | PRIV_START; | |
8002af61 | 597 | sensitive_data.keys[0] = key_load_private_type(KEY_RSA1, |
aeaa3d9e | 598 | _PATH_HOST_KEY_FILE, "", NULL); |
8002af61 | 599 | sensitive_data.keys[1] = key_load_private_type(KEY_DSA, |
600 | _PATH_HOST_DSA_KEY_FILE, "", NULL); | |
601 | sensitive_data.keys[2] = key_load_private_type(KEY_RSA, | |
602 | _PATH_HOST_RSA_KEY_FILE, "", NULL); | |
3fb156df | 603 | PRIV_END; |
39c00dc2 | 604 | |
60cd0a97 | 605 | if (options.hostbased_authentication == 1 && |
606 | sensitive_data.keys[0] == NULL && | |
39c00dc2 | 607 | sensitive_data.keys[1] == NULL && |
608 | sensitive_data.keys[2] == NULL) { | |
609 | sensitive_data.keys[1] = key_load_public( | |
610 | _PATH_HOST_DSA_KEY_FILE, NULL); | |
611 | sensitive_data.keys[2] = key_load_public( | |
612 | _PATH_HOST_RSA_KEY_FILE, NULL); | |
613 | sensitive_data.external_keysign = 1; | |
614 | } | |
5260325f | 615 | } |
aa3378df | 616 | /* |
617 | * Get rid of any extra privileges that we may have. We will no | |
618 | * longer need them. Also, extra privileges could make it very hard | |
619 | * to read identity files and other non-world-readable files from the | |
620 | * user's home directory if it happens to be on a NFS volume where | |
621 | * root is mapped to nobody. | |
622 | */ | |
3fb156df | 623 | seteuid(original_real_uid); |
624 | setuid(original_real_uid); | |
5260325f | 625 | |
aa3378df | 626 | /* |
627 | * Now that we are back to our own permissions, create ~/.ssh | |
628 | * directory if it doesn\'t already exist. | |
629 | */ | |
c3abff07 | 630 | snprintf(buf, sizeof buf, "%.100s%s%.100s", pw->pw_dir, strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR); |
5260325f | 631 | if (stat(buf, &st) < 0) |
704b1659 | 632 | if (mkdir(buf, 0700) < 0) |
5260325f | 633 | error("Could not create directory '%.200s'.", buf); |
634 | ||
fee56204 | 635 | /* load options.identity_files */ |
636 | load_public_identity_files(); | |
637 | ||
638 | /* Expand ~ in known host file names. */ | |
639 | /* XXX mem-leaks: */ | |
fa08c86b | 640 | options.system_hostfile = |
641 | tilde_expand_filename(options.system_hostfile, original_real_uid); | |
642 | options.user_hostfile = | |
643 | tilde_expand_filename(options.user_hostfile, original_real_uid); | |
644 | options.system_hostfile2 = | |
645 | tilde_expand_filename(options.system_hostfile2, original_real_uid); | |
646 | options.user_hostfile2 = | |
647 | tilde_expand_filename(options.user_hostfile2, original_real_uid); | |
5260325f | 648 | |
67b75437 | 649 | signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */ |
650 | ||
5260325f | 651 | /* Log into the remote system. This never returns if the login fails. */ |
39c00dc2 | 652 | ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr, pw); |
8002af61 | 653 | |
654 | /* We no longer need the private host keys. Clear them now. */ | |
655 | if (sensitive_data.nkeys != 0) { | |
656 | for (i = 0; i < sensitive_data.nkeys; i++) { | |
657 | if (sensitive_data.keys[i] != NULL) { | |
658 | /* Destroys contents safely */ | |
659 | debug3("clear hostkey %d", i); | |
660 | key_free(sensitive_data.keys[i]); | |
661 | sensitive_data.keys[i] = NULL; | |
662 | } | |
663 | } | |
664 | xfree(sensitive_data.keys); | |
665 | } | |
05b7537a | 666 | for (i = 0; i < options.num_identity_files; i++) { |
667 | if (options.identity_files[i]) { | |
668 | xfree(options.identity_files[i]); | |
669 | options.identity_files[i] = NULL; | |
670 | } | |
671 | if (options.identity_keys[i]) { | |
672 | key_free(options.identity_keys[i]); | |
673 | options.identity_keys[i] = NULL; | |
674 | } | |
675 | } | |
5260325f | 676 | |
8ce64345 | 677 | exit_status = compat20 ? ssh_session2() : ssh_session(); |
678 | packet_close(); | |
6939bbd4 | 679 | |
680 | /* | |
aff51935 | 681 | * Send SIGHUP to proxy command if used. We don't wait() in |
6939bbd4 | 682 | * case it hangs and instead rely on init to reap the child |
683 | */ | |
684 | if (proxy_command_pid > 1) | |
685 | kill(proxy_command_pid, SIGHUP); | |
686 | ||
8ce64345 | 687 | return exit_status; |
688 | } | |
689 | ||
d73a67d7 | 690 | #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1" |
691 | ||
396c147e | 692 | static void |
b48eeb07 | 693 | x11_get_proto(char **_proto, char **_data) |
0b242b12 | 694 | { |
d73a67d7 | 695 | char cmd[1024]; |
0b242b12 | 696 | char line[512]; |
d73a67d7 | 697 | char xdisplay[512]; |
b48eeb07 | 698 | static char proto[512], data[512]; |
0b242b12 | 699 | FILE *f; |
d73a67d7 | 700 | int got_data = 0, generated = 0, do_unlink = 0, i; |
701 | char *display, *xauthdir, *xauthfile; | |
5d185586 | 702 | struct stat st; |
0b242b12 | 703 | |
d73a67d7 | 704 | xauthdir = xauthfile = NULL; |
b48eeb07 | 705 | *_proto = proto; |
706 | *_data = data; | |
707 | proto[0] = data[0] = '\0'; | |
d73a67d7 | 708 | |
5d185586 | 709 | if (!options.xauth_location || |
710 | (stat(options.xauth_location, &st) == -1)) { | |
711 | debug("No xauth program."); | |
712 | } else { | |
713 | if ((display = getenv("DISPLAY")) == NULL) { | |
714 | debug("x11_get_proto: DISPLAY not set"); | |
715 | return; | |
716 | } | |
d73a67d7 | 717 | /* |
718 | * Handle FamilyLocal case where $DISPLAY does | |
719 | * not match an authorization entry. For this we | |
720 | * just try "xauth list unix:displaynum.screennum". | |
721 | * XXX: "localhost" match to determine FamilyLocal | |
722 | * is not perfect. | |
723 | */ | |
724 | if (strncmp(display, "localhost:", 10) == 0) { | |
725 | snprintf(xdisplay, sizeof(xdisplay), "unix:%s", | |
726 | display + 10); | |
727 | display = xdisplay; | |
728 | } | |
729 | if (options.forward_x11_trusted == 0) { | |
730 | xauthdir = xmalloc(MAXPATHLEN); | |
731 | xauthfile = xmalloc(MAXPATHLEN); | |
732 | strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN); | |
733 | if (mkdtemp(xauthdir) != NULL) { | |
734 | do_unlink = 1; | |
735 | snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile", | |
736 | xauthdir); | |
737 | snprintf(cmd, sizeof(cmd), | |
738 | "%s -f %s generate %s " SSH_X11_PROTO | |
c876ee7e | 739 | " untrusted timeout 1200 2>" _PATH_DEVNULL, |
d73a67d7 | 740 | options.xauth_location, xauthfile, display); |
741 | debug2("x11_get_proto: %s", cmd); | |
742 | if (system(cmd) == 0) | |
743 | generated = 1; | |
744 | } | |
745 | } | |
746 | snprintf(cmd, sizeof(cmd), | |
747 | "%s %s%s list %s . 2>" _PATH_DEVNULL, | |
748 | options.xauth_location, | |
749 | generated ? "-f " : "" , | |
750 | generated ? xauthfile : "", | |
751 | display); | |
752 | debug2("x11_get_proto: %s", cmd); | |
753 | f = popen(cmd, "r"); | |
fa649821 | 754 | if (f && fgets(line, sizeof(line), f) && |
b48eeb07 | 755 | sscanf(line, "%*s %511s %511s", proto, data) == 2) |
fa649821 | 756 | got_data = 1; |
757 | if (f) | |
758 | pclose(f); | |
759 | } | |
d73a67d7 | 760 | |
761 | if (do_unlink) { | |
762 | unlink(xauthfile); | |
763 | rmdir(xauthdir); | |
764 | } | |
765 | if (xauthdir) | |
766 | xfree(xauthdir); | |
767 | if (xauthfile) | |
768 | xfree(xauthfile); | |
769 | ||
0b242b12 | 770 | /* |
771 | * If we didn't get authentication data, just make up some | |
772 | * data. The forwarding code will check the validity of the | |
773 | * response anyway, and substitute this data. The X11 | |
774 | * server, however, will ignore this fake data and use | |
775 | * whatever authentication mechanisms it was using otherwise | |
776 | * for the local connection. | |
777 | */ | |
778 | if (!got_data) { | |
779 | u_int32_t rand = 0; | |
780 | ||
d73a67d7 | 781 | logit("Warning: No xauth data; " |
782 | "using fake authentication data for X11 forwarding."); | |
783 | strlcpy(proto, SSH_X11_PROTO, sizeof proto); | |
0b242b12 | 784 | for (i = 0; i < 16; i++) { |
785 | if (i % 4 == 0) | |
786 | rand = arc4random(); | |
d73a67d7 | 787 | snprintf(data + 2 * i, sizeof data - 2 * i, "%02x", |
788 | rand & 0xff); | |
0b242b12 | 789 | rand >>= 8; |
790 | } | |
791 | } | |
792 | } | |
793 | ||
396c147e | 794 | static void |
fa08c86b | 795 | ssh_init_forwarding(void) |
796 | { | |
02a024dd | 797 | int success = 0; |
fa08c86b | 798 | int i; |
02a024dd | 799 | |
fa08c86b | 800 | /* Initiate local TCP/IP port forwardings. */ |
801 | for (i = 0; i < options.num_local_forwards; i++) { | |
802 | debug("Connections to local port %d forwarded to remote address %.200s:%d", | |
803 | options.local_forwards[i].port, | |
804 | options.local_forwards[i].host, | |
805 | options.local_forwards[i].host_port); | |
5641aefa | 806 | success += channel_setup_local_fwd_listener( |
fa08c86b | 807 | options.local_forwards[i].port, |
808 | options.local_forwards[i].host, | |
809 | options.local_forwards[i].host_port, | |
810 | options.gateway_ports); | |
811 | } | |
02a024dd | 812 | if (i > 0 && success == 0) |
813 | error("Could not request local forwarding."); | |
fa08c86b | 814 | |
815 | /* Initiate remote TCP/IP port forwardings. */ | |
816 | for (i = 0; i < options.num_remote_forwards; i++) { | |
817 | debug("Connections to remote port %d forwarded to local address %.200s:%d", | |
818 | options.remote_forwards[i].port, | |
819 | options.remote_forwards[i].host, | |
820 | options.remote_forwards[i].host_port); | |
821 | channel_request_remote_forwarding( | |
822 | options.remote_forwards[i].port, | |
823 | options.remote_forwards[i].host, | |
824 | options.remote_forwards[i].host_port); | |
825 | } | |
826 | } | |
827 | ||
396c147e | 828 | static void |
fa08c86b | 829 | check_agent_present(void) |
830 | { | |
831 | if (options.forward_agent) { | |
832 | /* Clear agent forwarding if we don\'t have an agent. */ | |
8b10e20e | 833 | if (!ssh_agent_present()) |
fa08c86b | 834 | options.forward_agent = 0; |
fa08c86b | 835 | } |
836 | } | |
837 | ||
396c147e | 838 | static int |
8ce64345 | 839 | ssh_session(void) |
840 | { | |
841 | int type; | |
8ce64345 | 842 | int interactive = 0; |
843 | int have_tty = 0; | |
844 | struct winsize ws; | |
8ce64345 | 845 | char *cp; |
846 | ||
5260325f | 847 | /* Enable compression if requested. */ |
848 | if (options.compression) { | |
849 | debug("Requesting compression at level %d.", options.compression_level); | |
850 | ||
851 | if (options.compression_level < 1 || options.compression_level > 9) | |
852 | fatal("Compression level must be from 1 (fast) to 9 (slow, best)."); | |
853 | ||
854 | /* Send the request. */ | |
855 | packet_start(SSH_CMSG_REQUEST_COMPRESSION); | |
856 | packet_put_int(options.compression_level); | |
857 | packet_send(); | |
858 | packet_write_wait(); | |
54a5250f | 859 | type = packet_read(); |
5260325f | 860 | if (type == SSH_SMSG_SUCCESS) |
861 | packet_start_compression(options.compression_level); | |
862 | else if (type == SSH_SMSG_FAILURE) | |
bbe88b6d | 863 | logit("Warning: Remote host refused compression."); |
5260325f | 864 | else |
865 | packet_disconnect("Protocol error waiting for compression response."); | |
866 | } | |
867 | /* Allocate a pseudo tty if appropriate. */ | |
868 | if (tty_flag) { | |
869 | debug("Requesting pty."); | |
870 | ||
871 | /* Start the packet. */ | |
872 | packet_start(SSH_CMSG_REQUEST_PTY); | |
873 | ||
874 | /* Store TERM in the packet. There is no limit on the | |
875 | length of the string. */ | |
876 | cp = getenv("TERM"); | |
877 | if (!cp) | |
878 | cp = ""; | |
449c5ba5 | 879 | packet_put_cstring(cp); |
5260325f | 880 | |
881 | /* Store window size in the packet. */ | |
882 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) | |
883 | memset(&ws, 0, sizeof(ws)); | |
884 | packet_put_int(ws.ws_row); | |
885 | packet_put_int(ws.ws_col); | |
886 | packet_put_int(ws.ws_xpixel); | |
887 | packet_put_int(ws.ws_ypixel); | |
888 | ||
889 | /* Store tty modes in the packet. */ | |
30dcc918 | 890 | tty_make_modes(fileno(stdin), NULL); |
5260325f | 891 | |
892 | /* Send the packet, and wait for it to leave. */ | |
893 | packet_send(); | |
894 | packet_write_wait(); | |
895 | ||
896 | /* Read response from the server. */ | |
54a5250f | 897 | type = packet_read(); |
4fe2af09 | 898 | if (type == SSH_SMSG_SUCCESS) { |
5260325f | 899 | interactive = 1; |
8ce64345 | 900 | have_tty = 1; |
4fe2af09 | 901 | } else if (type == SSH_SMSG_FAILURE) |
bbe88b6d | 902 | logit("Warning: Remote host failed or refused to allocate a pseudo tty."); |
5260325f | 903 | else |
904 | packet_disconnect("Protocol error waiting for pty request response."); | |
905 | } | |
906 | /* Request X11 forwarding if enabled and DISPLAY is set. */ | |
907 | if (options.forward_x11 && getenv("DISPLAY") != NULL) { | |
b48eeb07 | 908 | char *proto, *data; |
0b242b12 | 909 | /* Get reasonable local authentication information. */ |
b48eeb07 | 910 | x11_get_proto(&proto, &data); |
0b242b12 | 911 | /* Request forwarding with authentication spoofing. */ |
5260325f | 912 | debug("Requesting X11 forwarding with authentication spoofing."); |
0b242b12 | 913 | x11_request_forwarding_with_spoofing(0, proto, data); |
5260325f | 914 | |
915 | /* Read response from the server. */ | |
54a5250f | 916 | type = packet_read(); |
5260325f | 917 | if (type == SSH_SMSG_SUCCESS) { |
5260325f | 918 | interactive = 1; |
0b242b12 | 919 | } else if (type == SSH_SMSG_FAILURE) { |
bbe88b6d | 920 | logit("Warning: Remote host denied X11 forwarding."); |
0b242b12 | 921 | } else { |
5260325f | 922 | packet_disconnect("Protocol error waiting for X11 forwarding"); |
0b242b12 | 923 | } |
5260325f | 924 | } |
925 | /* Tell the packet module whether this is an interactive session. */ | |
b5c334cc | 926 | packet_set_interactive(interactive); |
5260325f | 927 | |
928 | /* Request authentication agent forwarding if appropriate. */ | |
fa08c86b | 929 | check_agent_present(); |
930 | ||
5260325f | 931 | if (options.forward_agent) { |
932 | debug("Requesting authentication agent forwarding."); | |
933 | auth_request_forwarding(); | |
934 | ||
935 | /* Read response from the server. */ | |
54a5250f | 936 | type = packet_read(); |
95500969 | 937 | packet_check_eom(); |
5260325f | 938 | if (type != SSH_SMSG_SUCCESS) |
bbe88b6d | 939 | logit("Warning: Remote host denied authentication agent forwarding."); |
5260325f | 940 | } |
8efc0c15 | 941 | |
fa08c86b | 942 | /* Initiate port forwardings. */ |
943 | ssh_init_forwarding(); | |
5260325f | 944 | |
aa3378df | 945 | /* If requested, let ssh continue in the background. */ |
6ae2364d | 946 | if (fork_after_authentication_flag) |
aa3378df | 947 | if (daemon(1, 1) < 0) |
948 | fatal("daemon() failed: %.200s", strerror(errno)); | |
949 | ||
950 | /* | |
951 | * If a command was specified on the command line, execute the | |
952 | * command now. Otherwise request the server to start a shell. | |
953 | */ | |
5260325f | 954 | if (buffer_len(&command) > 0) { |
955 | int len = buffer_len(&command); | |
956 | if (len > 900) | |
957 | len = 900; | |
6c0fa2b1 | 958 | debug("Sending command: %.*s", len, (u_char *)buffer_ptr(&command)); |
5260325f | 959 | packet_start(SSH_CMSG_EXEC_CMD); |
960 | packet_put_string(buffer_ptr(&command), buffer_len(&command)); | |
961 | packet_send(); | |
962 | packet_write_wait(); | |
963 | } else { | |
964 | debug("Requesting shell."); | |
965 | packet_start(SSH_CMSG_EXEC_SHELL); | |
966 | packet_send(); | |
967 | packet_write_wait(); | |
968 | } | |
969 | ||
970 | /* Enter the interactive session. */ | |
4bf9c10e | 971 | return client_loop(have_tty, tty_flag ? |
972 | options.escape_char : SSH_ESCAPECHAR_NONE, 0); | |
8ce64345 | 973 | } |
5260325f | 974 | |
396c147e | 975 | static void |
7819b5c3 | 976 | client_subsystem_reply(int type, u_int32_t seq, void *ctxt) |
1f3bf5aa | 977 | { |
978 | int id, len; | |
979 | ||
980 | id = packet_get_int(); | |
981 | len = buffer_len(&command); | |
ce91d6f8 | 982 | if (len > 900) |
983 | len = 900; | |
95500969 | 984 | packet_check_eom(); |
1f3bf5aa | 985 | if (type == SSH2_MSG_CHANNEL_FAILURE) |
986 | fatal("Request for subsystem '%.*s' failed on channel %d", | |
6c0fa2b1 | 987 | len, (u_char *)buffer_ptr(&command), id); |
1f3bf5aa | 988 | } |
989 | ||
e0ae8728 | 990 | void |
5d8d32a3 | 991 | client_global_request_reply_fwd(int type, u_int32_t seq, void *ctxt) |
e0ae8728 | 992 | { |
993 | int i; | |
994 | ||
995 | i = client_global_request_id++; | |
5d8d32a3 | 996 | if (i >= options.num_remote_forwards) |
e0ae8728 | 997 | return; |
e0ae8728 | 998 | debug("remote forward %s for: listen %d, connect %s:%d", |
999 | type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure", | |
1000 | options.remote_forwards[i].port, | |
1001 | options.remote_forwards[i].host, | |
1002 | options.remote_forwards[i].host_port); | |
1003 | if (type == SSH2_MSG_REQUEST_FAILURE) | |
bbe88b6d | 1004 | logit("Warning: remote port forwarding failed for listen port %d", |
e0ae8728 | 1005 | options.remote_forwards[i].port); |
1006 | } | |
1007 | ||
bcdb96c2 | 1008 | /* request pty/x11/agent/tcpfwd/shell for channel */ |
396c147e | 1009 | static void |
bcdb96c2 | 1010 | ssh_session2_setup(int id, void *arg) |
8ce64345 | 1011 | { |
1012 | int len; | |
b5c334cc | 1013 | int interactive = 0; |
30dcc918 | 1014 | struct termios tio; |
b5c334cc | 1015 | |
83bbc162 | 1016 | debug2("ssh_session2_setup: id %d", id); |
8ce64345 | 1017 | |
8ce64345 | 1018 | if (tty_flag) { |
1019 | struct winsize ws; | |
1020 | char *cp; | |
1021 | cp = getenv("TERM"); | |
1022 | if (!cp) | |
1023 | cp = ""; | |
1024 | /* Store window size in the packet. */ | |
1025 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) | |
1026 | memset(&ws, 0, sizeof(ws)); | |
1027 | ||
1028 | channel_request_start(id, "pty-req", 0); | |
1029 | packet_put_cstring(cp); | |
1030 | packet_put_int(ws.ws_col); | |
1031 | packet_put_int(ws.ws_row); | |
1032 | packet_put_int(ws.ws_xpixel); | |
1033 | packet_put_int(ws.ws_ypixel); | |
30dcc918 | 1034 | tio = get_saved_tio(); |
1035 | tty_make_modes(/*ignored*/ 0, &tio); | |
8ce64345 | 1036 | packet_send(); |
b5c334cc | 1037 | interactive = 1; |
8ce64345 | 1038 | /* XXX wait for reply */ |
1039 | } | |
0b242b12 | 1040 | if (options.forward_x11 && |
1041 | getenv("DISPLAY") != NULL) { | |
b48eeb07 | 1042 | char *proto, *data; |
0b242b12 | 1043 | /* Get reasonable local authentication information. */ |
b48eeb07 | 1044 | x11_get_proto(&proto, &data); |
0b242b12 | 1045 | /* Request forwarding with authentication spoofing. */ |
1046 | debug("Requesting X11 forwarding with authentication spoofing."); | |
1047 | x11_request_forwarding_with_spoofing(id, proto, data); | |
b5c334cc | 1048 | interactive = 1; |
0b242b12 | 1049 | /* XXX wait for reply */ |
1050 | } | |
1051 | ||
fa08c86b | 1052 | check_agent_present(); |
1053 | if (options.forward_agent) { | |
1054 | debug("Requesting authentication agent forwarding."); | |
1055 | channel_request_start(id, "auth-agent-req@openssh.com", 0); | |
1056 | packet_send(); | |
1057 | } | |
1058 | ||
8ce64345 | 1059 | len = buffer_len(&command); |
1060 | if (len > 0) { | |
1061 | if (len > 900) | |
1062 | len = 900; | |
ae810de7 | 1063 | if (subsystem_flag) { |
6c0fa2b1 | 1064 | debug("Sending subsystem: %.*s", len, (u_char *)buffer_ptr(&command)); |
1f3bf5aa | 1065 | channel_request_start(id, "subsystem", /*want reply*/ 1); |
1066 | /* register callback for reply */ | |
c242fc96 | 1067 | /* XXX we assume that client_loop has already been called */ |
1f3bf5aa | 1068 | dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &client_subsystem_reply); |
1069 | dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &client_subsystem_reply); | |
ae810de7 | 1070 | } else { |
6c0fa2b1 | 1071 | debug("Sending command: %.*s", len, (u_char *)buffer_ptr(&command)); |
ae810de7 | 1072 | channel_request_start(id, "exec", 0); |
1073 | } | |
ce91d6f8 | 1074 | packet_put_string(buffer_ptr(&command), buffer_len(&command)); |
8ce64345 | 1075 | packet_send(); |
1076 | } else { | |
06ee33fb | 1077 | channel_request_start(id, "shell", 0); |
1078 | packet_send(); | |
8ce64345 | 1079 | } |
1f3bf5aa | 1080 | |
b5c334cc | 1081 | packet_set_interactive(interactive); |
8ce64345 | 1082 | } |
1083 | ||
bcdb96c2 | 1084 | /* open new channel for a session */ |
396c147e | 1085 | static int |
bcdb96c2 | 1086 | ssh_session2_open(void) |
8ce64345 | 1087 | { |
719fc62f | 1088 | Channel *c; |
1089 | int window, packetmax, in, out, err; | |
2e73a022 | 1090 | |
14a9a859 | 1091 | if (stdin_null_flag) { |
5ca51e19 | 1092 | in = open(_PATH_DEVNULL, O_RDONLY); |
14a9a859 | 1093 | } else { |
1094 | in = dup(STDIN_FILENO); | |
1095 | } | |
2e73a022 | 1096 | out = dup(STDOUT_FILENO); |
1097 | err = dup(STDERR_FILENO); | |
8ce64345 | 1098 | |
1099 | if (in < 0 || out < 0 || err < 0) | |
14a9a859 | 1100 | fatal("dup() in/out/err failed"); |
8ce64345 | 1101 | |
a22aff1f | 1102 | /* enable nonblocking unless tty */ |
1103 | if (!isatty(in)) | |
1104 | set_nonblock(in); | |
1105 | if (!isatty(out)) | |
1106 | set_nonblock(out); | |
1107 | if (!isatty(err)) | |
1108 | set_nonblock(err); | |
1109 | ||
bcbf86ec | 1110 | window = CHAN_SES_WINDOW_DEFAULT; |
1111 | packetmax = CHAN_SES_PACKET_DEFAULT; | |
ea9700ba | 1112 | if (tty_flag) { |
1113 | window >>= 1; | |
1114 | packetmax >>= 1; | |
8ce64345 | 1115 | } |
719fc62f | 1116 | c = channel_new( |
8ce64345 | 1117 | "session", SSH_CHANNEL_OPENING, in, out, err, |
bcbf86ec | 1118 | window, packetmax, CHAN_EXTENDED_WRITE, |
0d942eff | 1119 | "client-session", /*nonblock*/0); |
8ce64345 | 1120 | |
bcdb96c2 | 1121 | debug3("ssh_session2_open: channel_new: %d", c->self); |
eb0dd41f | 1122 | |
36e1f6a1 | 1123 | channel_send_open(c->self); |
bcdb96c2 | 1124 | if (!no_shell_flag) |
05ca0898 | 1125 | channel_register_confirm(c->self, ssh_session2_setup); |
5260325f | 1126 | |
719fc62f | 1127 | return c->self; |
eb0dd41f | 1128 | } |
1129 | ||
396c147e | 1130 | static int |
eb0dd41f | 1131 | ssh_session2(void) |
1132 | { | |
bcdb96c2 | 1133 | int id = -1; |
eb0dd41f | 1134 | |
1135 | /* XXX should be pre-session */ | |
1136 | ssh_init_forwarding(); | |
1137 | ||
bcdb96c2 | 1138 | if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN)) |
1139 | id = ssh_session2_open(); | |
eb0dd41f | 1140 | |
1141 | /* If requested, let ssh continue in the background. */ | |
1142 | if (fork_after_authentication_flag) | |
1143 | if (daemon(1, 1) < 0) | |
1144 | fatal("daemon() failed: %.200s", strerror(errno)); | |
1145 | ||
4bf9c10e | 1146 | return client_loop(tty_flag, tty_flag ? |
1147 | options.escape_char : SSH_ESCAPECHAR_NONE, id); | |
8efc0c15 | 1148 | } |
fa08c86b | 1149 | |
396c147e | 1150 | static void |
fee56204 | 1151 | load_public_identity_files(void) |
1152 | { | |
1153 | char *filename; | |
2e23cde0 | 1154 | int i = 0; |
0659cace | 1155 | Key *public; |
383546c4 | 1156 | #ifdef SMARTCARD |
0659cace | 1157 | Key **keys; |
1158 | ||
9ff6f66f | 1159 | if (options.smartcard_device != NULL && |
0659cace | 1160 | options.num_identity_files < SSH_MAX_IDENTITY_FILES && |
1161 | (keys = sc_get_keys(options.smartcard_device, NULL)) != NULL ) { | |
1162 | int count = 0; | |
1163 | for (i = 0; keys[i] != NULL; i++) { | |
1164 | count++; | |
0659cace | 1165 | memmove(&options.identity_files[1], &options.identity_files[0], |
1166 | sizeof(char *) * (SSH_MAX_IDENTITY_FILES - 1)); | |
1167 | memmove(&options.identity_keys[1], &options.identity_keys[0], | |
1168 | sizeof(Key *) * (SSH_MAX_IDENTITY_FILES - 1)); | |
1169 | options.num_identity_files++; | |
1170 | options.identity_keys[0] = keys[i]; | |
244e796f | 1171 | options.identity_files[0] = sc_get_key_label(keys[i]); |
0659cace | 1172 | } |
1c2deed1 | 1173 | if (options.num_identity_files > SSH_MAX_IDENTITY_FILES) |
1174 | options.num_identity_files = SSH_MAX_IDENTITY_FILES; | |
0659cace | 1175 | i = count; |
1176 | xfree(keys); | |
383546c4 | 1177 | } |
3e984472 | 1178 | #endif /* SMARTCARD */ |
2e23cde0 | 1179 | for (; i < options.num_identity_files; i++) { |
1180 | filename = tilde_expand_filename(options.identity_files[i], | |
1181 | original_real_uid); | |
1182 | public = key_load_public(filename, NULL); | |
1183 | debug("identity file %s type %d", filename, | |
1184 | public ? public->type : -1); | |
1185 | xfree(options.identity_files[i]); | |
1186 | options.identity_files[i] = filename; | |
1187 | options.identity_keys[i] = public; | |
1188 | } | |
fee56204 | 1189 | } |