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3c0ef626 | 1 | /* |
2 | * Author: Tatu Ylonen <ylo@cs.hut.fi> | |
3 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
4 | * All rights reserved | |
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 | * | |
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. | |
cdd66111 | 16 | * Copyright (c) 2000, 2001, 2002, 2003 Markus Friedl. All rights reserved. |
3c0ef626 | 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. | |
40 | */ | |
41 | ||
42 | #include "includes.h" | |
665a873d | 43 | RCSID("$OpenBSD: ssh.c,v 1.249 2005/07/30 01:26:16 djm Exp $"); |
3c0ef626 | 44 | |
45 | #include <openssl/evp.h> | |
46 | #include <openssl/err.h> | |
47 | ||
48 | #include "ssh.h" | |
49 | #include "ssh1.h" | |
50 | #include "ssh2.h" | |
51 | #include "compat.h" | |
52 | #include "cipher.h" | |
53 | #include "xmalloc.h" | |
54 | #include "packet.h" | |
55 | #include "buffer.h" | |
c9f39d2c | 56 | #include "bufaux.h" |
3c0ef626 | 57 | #include "channels.h" |
58 | #include "key.h" | |
59 | #include "authfd.h" | |
60 | #include "authfile.h" | |
61 | #include "pathnames.h" | |
c9f39d2c | 62 | #include "dispatch.h" |
3c0ef626 | 63 | #include "clientloop.h" |
64 | #include "log.h" | |
65 | #include "readconf.h" | |
66 | #include "sshconnect.h" | |
3c0ef626 | 67 | #include "misc.h" |
68 | #include "kex.h" | |
69 | #include "mac.h" | |
c9f39d2c | 70 | #include "sshpty.h" |
71 | #include "match.h" | |
72 | #include "msg.h" | |
73 | #include "monitor_fdpass.h" | |
74 | #include "uidswap.h" | |
3c0ef626 | 75 | |
76 | #ifdef SMARTCARD | |
3c0ef626 | 77 | #include "scard.h" |
78 | #endif | |
79 | ||
3c0ef626 | 80 | extern char *__progname; |
3c0ef626 | 81 | |
3c0ef626 | 82 | /* Flag indicating whether debug mode is on. This can be set on the command line. */ |
83 | int debug_flag = 0; | |
84 | ||
85 | /* Flag indicating whether a tty should be allocated */ | |
86 | int tty_flag = 0; | |
87 | int no_tty_flag = 0; | |
88 | int force_tty_flag = 0; | |
89 | ||
90 | /* don't exec a shell */ | |
91 | int no_shell_flag = 0; | |
92 | ||
93 | /* | |
94 | * Flag indicating that nothing should be read from stdin. This can be set | |
95 | * on the command line. | |
96 | */ | |
97 | int stdin_null_flag = 0; | |
98 | ||
99 | /* | |
100 | * Flag indicating that ssh should fork after authentication. This is useful | |
f5799ae1 | 101 | * so that the passphrase can be entered manually, and then ssh goes to the |
3c0ef626 | 102 | * background. |
103 | */ | |
104 | int fork_after_authentication_flag = 0; | |
105 | ||
106 | /* | |
107 | * General data structure for command line options and options configurable | |
108 | * in configuration files. See readconf.h. | |
109 | */ | |
110 | Options options; | |
111 | ||
112 | /* optional user configfile */ | |
113 | char *config = NULL; | |
114 | ||
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 | */ | |
120 | char *host; | |
121 | ||
122 | /* socket address the host resolves to */ | |
123 | struct sockaddr_storage hostaddr; | |
124 | ||
125 | /* Private host keys. */ | |
f5799ae1 | 126 | Sensitive sensitive_data; |
3c0ef626 | 127 | |
128 | /* Original real UID. */ | |
129 | uid_t original_real_uid; | |
f5799ae1 | 130 | uid_t original_effective_uid; |
3c0ef626 | 131 | |
132 | /* command to be executed */ | |
133 | Buffer command; | |
134 | ||
135 | /* Should we execute a command or invoke a subsystem? */ | |
136 | int subsystem_flag = 0; | |
137 | ||
700318f3 | 138 | /* # of replies received for global requests */ |
139 | static int client_global_request_id = 0; | |
140 | ||
41b2f314 | 141 | /* pid of proxycommand child process */ |
142 | pid_t proxy_command_pid = 0; | |
143 | ||
c9f39d2c | 144 | /* fd to control socket */ |
145 | int control_fd = -1; | |
146 | ||
996d5e62 | 147 | /* Multiplexing control command */ |
665a873d | 148 | static u_int mux_command = 0; |
996d5e62 | 149 | |
c9f39d2c | 150 | /* Only used in control client mode */ |
151 | volatile sig_atomic_t control_client_terminate = 0; | |
152 | u_int control_server_pid = 0; | |
153 | ||
3c0ef626 | 154 | /* Prints a help message to the user. This function never returns. */ |
155 | ||
156 | static void | |
157 | usage(void) | |
158 | { | |
99be0775 | 159 | fprintf(stderr, |
996d5e62 | 160 | "usage: ssh [-1246AaCfgkMNnqsTtVvXxY] [-b bind_address] [-c cipher_spec]\n" |
161 | " [-D port] [-e escape_char] [-F configfile]\n" | |
162 | " [-i identity_file] [-L [bind_address:]port:host:hostport]\n" | |
163 | " [-l login_name] [-m mac_spec] [-O ctl_cmd] [-o option] [-p port]\n" | |
164 | " [-R [bind_address:]port:host:hostport] [-S ctl_path]\n" | |
165 | " [user@]hostname [command]\n" | |
99be0775 | 166 | ); |
3c0ef626 | 167 | exit(1); |
168 | } | |
169 | ||
3c0ef626 | 170 | static int ssh_session(void); |
171 | static int ssh_session2(void); | |
172 | static void load_public_identity_files(void); | |
c9f39d2c | 173 | static void control_client(const char *path); |
3c0ef626 | 174 | |
175 | /* | |
176 | * Main program for the ssh client. | |
177 | */ | |
178 | int | |
179 | main(int ac, char **av) | |
180 | { | |
f5799ae1 | 181 | int i, opt, exit_status; |
cdd66111 | 182 | char *p, *cp, *line, buf[256]; |
3c0ef626 | 183 | struct stat st; |
184 | struct passwd *pw; | |
185 | int dummy; | |
3c0ef626 | 186 | extern int optind, optreset; |
187 | extern char *optarg; | |
665a873d | 188 | struct servent *sp; |
996d5e62 | 189 | Forward fwd; |
3c0ef626 | 190 | |
0fff78ff | 191 | __progname = ssh_get_progname(av[0]); |
3c0ef626 | 192 | init_rng(); |
193 | ||
194 | /* | |
195 | * Save the original real uid. It will be needed later (uid-swapping | |
196 | * may clobber the real uid). | |
197 | */ | |
198 | original_real_uid = getuid(); | |
199 | original_effective_uid = geteuid(); | |
cdd66111 | 200 | |
41b2f314 | 201 | /* |
202 | * Use uid-swapping to give up root privileges for the duration of | |
203 | * option processing. We will re-instantiate the rights when we are | |
204 | * ready to create the privileged port, and will permanently drop | |
205 | * them when the port has been created (actually, when the connection | |
206 | * has been made, as we may need to create the port several times). | |
207 | */ | |
208 | PRIV_END; | |
3c0ef626 | 209 | |
210 | #ifdef HAVE_SETRLIMIT | |
211 | /* If we are installed setuid root be careful to not drop core. */ | |
212 | if (original_real_uid != original_effective_uid) { | |
213 | struct rlimit rlim; | |
214 | rlim.rlim_cur = rlim.rlim_max = 0; | |
215 | if (setrlimit(RLIMIT_CORE, &rlim) < 0) | |
216 | fatal("setrlimit failed: %.100s", strerror(errno)); | |
217 | } | |
218 | #endif | |
219 | /* Get user data. */ | |
220 | pw = getpwuid(original_real_uid); | |
221 | if (!pw) { | |
0fff78ff | 222 | logit("You don't exist, go away!"); |
3c0ef626 | 223 | exit(1); |
224 | } | |
225 | /* Take a copy of the returned structure. */ | |
226 | pw = pwcopy(pw); | |
227 | ||
3c0ef626 | 228 | /* |
229 | * Set our umask to something reasonable, as some files are created | |
230 | * with the default umask. This will make them world-readable but | |
231 | * writable only by the owner, which is ok for all files for which we | |
232 | * don't set the modes explicitly. | |
233 | */ | |
234 | umask(022); | |
235 | ||
236 | /* Initialize option structure to indicate that no values have been set. */ | |
237 | initialize_options(&options); | |
238 | ||
239 | /* Parse command-line arguments. */ | |
240 | host = NULL; | |
241 | ||
242 | again: | |
243 | while ((opt = getopt(ac, av, | |
996d5e62 | 244 | "1246ab:c:e:fgi:kl:m:no:p:qstvxACD:F:I:L:MNO:PR:S:TVXY")) != -1) { |
3c0ef626 | 245 | switch (opt) { |
246 | case '1': | |
247 | options.protocol = SSH_PROTO_1; | |
248 | break; | |
249 | case '2': | |
250 | options.protocol = SSH_PROTO_2; | |
251 | break; | |
252 | case '4': | |
0fff78ff | 253 | options.address_family = AF_INET; |
3c0ef626 | 254 | break; |
255 | case '6': | |
0fff78ff | 256 | options.address_family = AF_INET6; |
3c0ef626 | 257 | break; |
258 | case 'n': | |
259 | stdin_null_flag = 1; | |
260 | break; | |
261 | case 'f': | |
262 | fork_after_authentication_flag = 1; | |
263 | stdin_null_flag = 1; | |
264 | break; | |
265 | case 'x': | |
266 | options.forward_x11 = 0; | |
267 | break; | |
268 | case 'X': | |
269 | options.forward_x11 = 1; | |
270 | break; | |
cdd66111 | 271 | case 'Y': |
272 | options.forward_x11 = 1; | |
273 | options.forward_x11_trusted = 1; | |
274 | break; | |
3c0ef626 | 275 | case 'g': |
276 | options.gateway_ports = 1; | |
277 | break; | |
996d5e62 | 278 | case 'O': |
279 | if (strcmp(optarg, "check") == 0) | |
280 | mux_command = SSHMUX_COMMAND_ALIVE_CHECK; | |
281 | else if (strcmp(optarg, "exit") == 0) | |
282 | mux_command = SSHMUX_COMMAND_TERMINATE; | |
283 | else | |
284 | fatal("Invalid multiplex command."); | |
285 | break; | |
41b2f314 | 286 | case 'P': /* deprecated */ |
3c0ef626 | 287 | options.use_privileged_port = 0; |
288 | break; | |
289 | case 'a': | |
290 | options.forward_agent = 0; | |
291 | break; | |
292 | case 'A': | |
293 | options.forward_agent = 1; | |
294 | break; | |
3c0ef626 | 295 | case 'k': |
cdd66111 | 296 | options.gss_deleg_creds = 0; |
3c0ef626 | 297 | break; |
3c0ef626 | 298 | case 'i': |
299 | if (stat(optarg, &st) < 0) { | |
300 | fprintf(stderr, "Warning: Identity file %s " | |
996d5e62 | 301 | "not accessible: %s.\n", optarg, |
302 | strerror(errno)); | |
3c0ef626 | 303 | break; |
304 | } | |
305 | if (options.num_identity_files >= | |
306 | SSH_MAX_IDENTITY_FILES) | |
307 | fatal("Too many identity files specified " | |
308 | "(max %d)", SSH_MAX_IDENTITY_FILES); | |
309 | options.identity_files[options.num_identity_files++] = | |
310 | xstrdup(optarg); | |
311 | break; | |
312 | case 'I': | |
313 | #ifdef SMARTCARD | |
314 | options.smartcard_device = xstrdup(optarg); | |
315 | #else | |
316 | fprintf(stderr, "no support for smartcards.\n"); | |
317 | #endif | |
318 | break; | |
319 | case 't': | |
320 | if (tty_flag) | |
321 | force_tty_flag = 1; | |
322 | tty_flag = 1; | |
323 | break; | |
324 | case 'v': | |
0fff78ff | 325 | if (debug_flag == 0) { |
3c0ef626 | 326 | debug_flag = 1; |
327 | options.log_level = SYSLOG_LEVEL_DEBUG1; | |
0fff78ff | 328 | } else { |
329 | if (options.log_level < SYSLOG_LEVEL_DEBUG3) | |
330 | options.log_level++; | |
3c0ef626 | 331 | break; |
0fff78ff | 332 | } |
996d5e62 | 333 | /* FALLTHROUGH */ |
3c0ef626 | 334 | case 'V': |
99be0775 | 335 | fprintf(stderr, "%s, %s\n", |
996d5e62 | 336 | SSH_RELEASE, SSLeay_version(SSLEAY_VERSION)); |
3c0ef626 | 337 | if (opt == 'V') |
338 | exit(0); | |
339 | break; | |
340 | case 'q': | |
341 | options.log_level = SYSLOG_LEVEL_QUIET; | |
342 | break; | |
343 | case 'e': | |
344 | if (optarg[0] == '^' && optarg[2] == 0 && | |
345 | (u_char) optarg[1] >= 64 && | |
346 | (u_char) optarg[1] < 128) | |
347 | options.escape_char = (u_char) optarg[1] & 31; | |
348 | else if (strlen(optarg) == 1) | |
349 | options.escape_char = (u_char) optarg[0]; | |
350 | else if (strcmp(optarg, "none") == 0) | |
351 | options.escape_char = SSH_ESCAPECHAR_NONE; | |
352 | else { | |
353 | fprintf(stderr, "Bad escape character '%s'.\n", | |
354 | optarg); | |
355 | exit(1); | |
356 | } | |
357 | break; | |
358 | case 'c': | |
359 | if (ciphers_valid(optarg)) { | |
360 | /* SSH2 only */ | |
361 | options.ciphers = xstrdup(optarg); | |
c9f39d2c | 362 | options.cipher = SSH_CIPHER_INVALID; |
3c0ef626 | 363 | } else { |
364 | /* SSH1 only */ | |
365 | options.cipher = cipher_number(optarg); | |
366 | if (options.cipher == -1) { | |
367 | fprintf(stderr, | |
368 | "Unknown cipher type '%s'\n", | |
369 | optarg); | |
370 | exit(1); | |
371 | } | |
372 | if (options.cipher == SSH_CIPHER_3DES) | |
373 | options.ciphers = "3des-cbc"; | |
374 | else if (options.cipher == SSH_CIPHER_BLOWFISH) | |
375 | options.ciphers = "blowfish-cbc"; | |
376 | else | |
377 | options.ciphers = (char *)-1; | |
378 | } | |
379 | break; | |
380 | case 'm': | |
381 | if (mac_valid(optarg)) | |
382 | options.macs = xstrdup(optarg); | |
383 | else { | |
384 | fprintf(stderr, "Unknown mac type '%s'\n", | |
385 | optarg); | |
386 | exit(1); | |
387 | } | |
388 | break; | |
c9f39d2c | 389 | case 'M': |
665a873d | 390 | if (options.control_master == SSHCTL_MASTER_YES) |
391 | options.control_master = SSHCTL_MASTER_ASK; | |
392 | else | |
393 | options.control_master = SSHCTL_MASTER_YES; | |
c9f39d2c | 394 | break; |
3c0ef626 | 395 | case 'p': |
396 | options.port = a2port(optarg); | |
397 | if (options.port == 0) { | |
398 | fprintf(stderr, "Bad port '%s'\n", optarg); | |
399 | exit(1); | |
400 | } | |
401 | break; | |
402 | case 'l': | |
403 | options.user = optarg; | |
404 | break; | |
405 | ||
406 | case 'L': | |
996d5e62 | 407 | if (parse_forward(&fwd, optarg)) |
408 | add_local_forward(&options, &fwd); | |
409 | else { | |
3c0ef626 | 410 | fprintf(stderr, |
996d5e62 | 411 | "Bad local forwarding specification '%s'\n", |
3c0ef626 | 412 | optarg); |
996d5e62 | 413 | exit(1); |
3c0ef626 | 414 | } |
996d5e62 | 415 | break; |
416 | ||
417 | case 'R': | |
418 | if (parse_forward(&fwd, optarg)) { | |
419 | add_remote_forward(&options, &fwd); | |
420 | } else { | |
3c0ef626 | 421 | fprintf(stderr, |
996d5e62 | 422 | "Bad remote forwarding specification " |
423 | "'%s'\n", optarg); | |
3c0ef626 | 424 | exit(1); |
425 | } | |
3c0ef626 | 426 | break; |
427 | ||
428 | case 'D': | |
996d5e62 | 429 | cp = p = xstrdup(optarg); |
430 | memset(&fwd, '\0', sizeof(fwd)); | |
431 | fwd.connect_host = "socks"; | |
432 | if ((fwd.listen_host = hpdelim(&cp)) == NULL) { | |
433 | fprintf(stderr, "Bad dynamic forwarding " | |
434 | "specification '%.100s'\n", optarg); | |
435 | exit(1); | |
436 | } | |
437 | if (cp != NULL) { | |
438 | fwd.listen_port = a2port(cp); | |
439 | fwd.listen_host = cleanhostname(fwd.listen_host); | |
440 | } else { | |
441 | fwd.listen_port = a2port(fwd.listen_host); | |
665a873d | 442 | fwd.listen_host = NULL; |
996d5e62 | 443 | } |
444 | ||
445 | if (fwd.listen_port == 0) { | |
3c0ef626 | 446 | fprintf(stderr, "Bad dynamic port '%s'\n", |
447 | optarg); | |
448 | exit(1); | |
449 | } | |
996d5e62 | 450 | add_local_forward(&options, &fwd); |
451 | xfree(p); | |
3c0ef626 | 452 | break; |
453 | ||
454 | case 'C': | |
455 | options.compression = 1; | |
456 | break; | |
457 | case 'N': | |
458 | no_shell_flag = 1; | |
459 | no_tty_flag = 1; | |
460 | break; | |
461 | case 'T': | |
462 | no_tty_flag = 1; | |
463 | break; | |
464 | case 'o': | |
465 | dummy = 1; | |
cdd66111 | 466 | line = xstrdup(optarg); |
3c0ef626 | 467 | if (process_config_line(&options, host ? host : "", |
cdd66111 | 468 | line, "command-line", 0, &dummy) != 0) |
3c0ef626 | 469 | exit(1); |
cdd66111 | 470 | xfree(line); |
3c0ef626 | 471 | break; |
472 | case 's': | |
473 | subsystem_flag = 1; | |
474 | break; | |
c9f39d2c | 475 | case 'S': |
476 | if (options.control_path != NULL) | |
477 | free(options.control_path); | |
478 | options.control_path = xstrdup(optarg); | |
479 | break; | |
3c0ef626 | 480 | case 'b': |
481 | options.bind_address = optarg; | |
482 | break; | |
483 | case 'F': | |
484 | config = optarg; | |
485 | break; | |
486 | default: | |
487 | usage(); | |
488 | } | |
489 | } | |
490 | ||
491 | ac -= optind; | |
492 | av += optind; | |
493 | ||
494 | if (ac > 0 && !host && **av != '-') { | |
6a9b3198 | 495 | if (strrchr(*av, '@')) { |
3c0ef626 | 496 | p = xstrdup(*av); |
6a9b3198 | 497 | cp = strrchr(p, '@'); |
3c0ef626 | 498 | if (cp == NULL || cp == p) |
499 | usage(); | |
500 | options.user = p; | |
501 | *cp = '\0'; | |
502 | host = ++cp; | |
503 | } else | |
504 | host = *av; | |
6a9b3198 | 505 | if (ac > 1) { |
506 | optind = optreset = 1; | |
3c0ef626 | 507 | goto again; |
508 | } | |
6a9b3198 | 509 | ac--, av++; |
3c0ef626 | 510 | } |
511 | ||
512 | /* Check that we got a host name. */ | |
513 | if (!host) | |
514 | usage(); | |
515 | ||
516 | SSLeay_add_all_algorithms(); | |
517 | ERR_load_crypto_strings(); | |
3c0ef626 | 518 | |
519 | /* Initialize the command to execute on remote host. */ | |
520 | buffer_init(&command); | |
521 | ||
522 | /* | |
523 | * Save the command to execute on the remote host in a buffer. There | |
524 | * is no limit on the length of the command, except by the maximum | |
525 | * packet size. Also sets the tty flag if there is no command. | |
526 | */ | |
527 | if (!ac) { | |
528 | /* No command specified - execute shell on a tty. */ | |
529 | tty_flag = 1; | |
530 | if (subsystem_flag) { | |
531 | fprintf(stderr, | |
532 | "You must specify a subsystem to invoke.\n"); | |
533 | usage(); | |
534 | } | |
535 | } else { | |
536 | /* A command has been specified. Store it into the buffer. */ | |
537 | for (i = 0; i < ac; i++) { | |
538 | if (i) | |
539 | buffer_append(&command, " ", 1); | |
540 | buffer_append(&command, av[i], strlen(av[i])); | |
541 | } | |
542 | } | |
543 | ||
544 | /* Cannot fork to background if no command. */ | |
545 | if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag) | |
546 | fatal("Cannot fork into background without a command to execute."); | |
547 | ||
548 | /* Allocate a tty by default if no command specified. */ | |
549 | if (buffer_len(&command) == 0) | |
550 | tty_flag = 1; | |
551 | ||
41b2f314 | 552 | /* Force no tty */ |
3c0ef626 | 553 | if (no_tty_flag) |
554 | tty_flag = 0; | |
555 | /* Do not allocate a tty if stdin is not a tty. */ | |
665a873d | 556 | if ((!isatty(fileno(stdin)) || stdin_null_flag) && !force_tty_flag) { |
3c0ef626 | 557 | if (tty_flag) |
0fff78ff | 558 | logit("Pseudo-terminal will not be allocated because stdin is not a terminal."); |
3c0ef626 | 559 | tty_flag = 0; |
560 | } | |
561 | ||
562 | /* | |
563 | * Initialize "log" output. Since we are the client all output | |
564 | * actually goes to stderr. | |
565 | */ | |
566 | log_init(av[0], options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level, | |
567 | SYSLOG_FACILITY_USER, 1); | |
568 | ||
569 | /* | |
570 | * Read per-user configuration file. Ignore the system wide config | |
571 | * file if the user specifies a config file on the command line. | |
572 | */ | |
573 | if (config != NULL) { | |
c9f39d2c | 574 | if (!read_config_file(config, host, &options, 0)) |
3c0ef626 | 575 | fatal("Can't open user config file %.100s: " |
576 | "%.100s", config, strerror(errno)); | |
577 | } else { | |
578 | snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, | |
579 | _PATH_SSH_USER_CONFFILE); | |
c9f39d2c | 580 | (void)read_config_file(buf, host, &options, 1); |
3c0ef626 | 581 | |
582 | /* Read systemwide configuration file after use config. */ | |
c9f39d2c | 583 | (void)read_config_file(_PATH_HOST_CONFIG_FILE, host, |
584 | &options, 0); | |
3c0ef626 | 585 | } |
586 | ||
587 | /* Fill configuration defaults. */ | |
588 | fill_default_options(&options); | |
589 | ||
0fff78ff | 590 | channel_set_af(options.address_family); |
591 | ||
3c0ef626 | 592 | /* reinit */ |
593 | log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 1); | |
594 | ||
595 | seed_rng(); | |
596 | ||
597 | if (options.user == NULL) | |
598 | options.user = xstrdup(pw->pw_name); | |
599 | ||
600 | if (options.hostname != NULL) | |
601 | host = options.hostname; | |
602 | ||
0fff78ff | 603 | /* force lowercase for hostkey matching */ |
604 | if (options.host_key_alias != NULL) { | |
605 | for (p = options.host_key_alias; *p; p++) | |
606 | if (isupper(*p)) | |
607 | *p = tolower(*p); | |
608 | } | |
609 | ||
665a873d | 610 | /* Get default port if port has not been set. */ |
611 | if (options.port == 0) { | |
612 | sp = getservbyname(SSH_SERVICE_NAME, "tcp"); | |
613 | options.port = sp ? ntohs(sp->s_port) : SSH_DEFAULT_PORT; | |
614 | } | |
615 | ||
6a9b3198 | 616 | if (options.proxy_command != NULL && |
617 | strcmp(options.proxy_command, "none") == 0) | |
618 | options.proxy_command = NULL; | |
665a873d | 619 | if (options.control_path != NULL && |
620 | strcmp(options.control_path, "none") == 0) | |
621 | options.control_path = NULL; | |
6a9b3198 | 622 | |
c9f39d2c | 623 | if (options.control_path != NULL) { |
665a873d | 624 | snprintf(buf, sizeof(buf), "%d", options.port); |
625 | cp = tilde_expand_filename(options.control_path, | |
626 | original_real_uid); | |
627 | options.control_path = percent_expand(cp, "p", buf, "h", host, | |
628 | "r", options.user, (char *)NULL); | |
629 | xfree(cp); | |
c9f39d2c | 630 | } |
665a873d | 631 | if (mux_command != 0 && options.control_path == NULL) |
632 | fatal("No ControlPath specified for \"-O\" command"); | |
633 | if (options.control_path != NULL) | |
634 | control_client(options.control_path); | |
c9f39d2c | 635 | |
3c0ef626 | 636 | /* Open a connection to the remote host. */ |
0fff78ff | 637 | if (ssh_connect(host, &hostaddr, options.port, |
638 | options.address_family, options.connection_attempts, | |
f5799ae1 | 639 | #ifdef HAVE_CYGWIN |
640 | options.use_privileged_port, | |
641 | #else | |
642 | original_effective_uid == 0 && options.use_privileged_port, | |
643 | #endif | |
644 | options.proxy_command) != 0) | |
645 | exit(1); | |
3c0ef626 | 646 | |
647 | /* | |
648 | * If we successfully made the connection, load the host private key | |
649 | * in case we will need it later for combined rsa-rhosts | |
650 | * authentication. This must be done before releasing extra | |
651 | * privileges, because the file is only readable by root. | |
f5799ae1 | 652 | * If we cannot access the private keys, load the public keys |
653 | * instead and try to execute the ssh-keysign helper instead. | |
3c0ef626 | 654 | */ |
655 | sensitive_data.nkeys = 0; | |
656 | sensitive_data.keys = NULL; | |
f5799ae1 | 657 | sensitive_data.external_keysign = 0; |
658 | if (options.rhosts_rsa_authentication || | |
659 | options.hostbased_authentication) { | |
3c0ef626 | 660 | sensitive_data.nkeys = 3; |
41b2f314 | 661 | sensitive_data.keys = xmalloc(sensitive_data.nkeys * |
662 | sizeof(Key)); | |
f5799ae1 | 663 | |
664 | PRIV_START; | |
3c0ef626 | 665 | sensitive_data.keys[0] = key_load_private_type(KEY_RSA1, |
666 | _PATH_HOST_KEY_FILE, "", NULL); | |
667 | sensitive_data.keys[1] = key_load_private_type(KEY_DSA, | |
668 | _PATH_HOST_DSA_KEY_FILE, "", NULL); | |
669 | sensitive_data.keys[2] = key_load_private_type(KEY_RSA, | |
670 | _PATH_HOST_RSA_KEY_FILE, "", NULL); | |
f5799ae1 | 671 | PRIV_END; |
672 | ||
41b2f314 | 673 | if (options.hostbased_authentication == 1 && |
674 | sensitive_data.keys[0] == NULL && | |
f5799ae1 | 675 | sensitive_data.keys[1] == NULL && |
676 | sensitive_data.keys[2] == NULL) { | |
677 | sensitive_data.keys[1] = key_load_public( | |
678 | _PATH_HOST_DSA_KEY_FILE, NULL); | |
679 | sensitive_data.keys[2] = key_load_public( | |
680 | _PATH_HOST_RSA_KEY_FILE, NULL); | |
681 | sensitive_data.external_keysign = 1; | |
682 | } | |
3c0ef626 | 683 | } |
684 | /* | |
685 | * Get rid of any extra privileges that we may have. We will no | |
686 | * longer need them. Also, extra privileges could make it very hard | |
687 | * to read identity files and other non-world-readable files from the | |
688 | * user's home directory if it happens to be on a NFS volume where | |
689 | * root is mapped to nobody. | |
690 | */ | |
c9f39d2c | 691 | if (original_effective_uid == 0) { |
692 | PRIV_START; | |
693 | permanently_set_uid(pw); | |
694 | } | |
3c0ef626 | 695 | |
696 | /* | |
697 | * Now that we are back to our own permissions, create ~/.ssh | |
698 | * directory if it doesn\'t already exist. | |
699 | */ | |
700 | snprintf(buf, sizeof buf, "%.100s%s%.100s", pw->pw_dir, strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR); | |
701 | if (stat(buf, &st) < 0) | |
702 | if (mkdir(buf, 0700) < 0) | |
703 | error("Could not create directory '%.200s'.", buf); | |
704 | ||
3c0ef626 | 705 | /* load options.identity_files */ |
706 | load_public_identity_files(); | |
707 | ||
708 | /* Expand ~ in known host file names. */ | |
709 | /* XXX mem-leaks: */ | |
710 | options.system_hostfile = | |
711 | tilde_expand_filename(options.system_hostfile, original_real_uid); | |
712 | options.user_hostfile = | |
713 | tilde_expand_filename(options.user_hostfile, original_real_uid); | |
714 | options.system_hostfile2 = | |
715 | tilde_expand_filename(options.system_hostfile2, original_real_uid); | |
716 | options.user_hostfile2 = | |
717 | tilde_expand_filename(options.user_hostfile2, original_real_uid); | |
718 | ||
719 | signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */ | |
720 | ||
721 | /* Log into the remote system. This never returns if the login fails. */ | |
f5799ae1 | 722 | ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr, pw); |
3c0ef626 | 723 | |
724 | /* We no longer need the private host keys. Clear them now. */ | |
725 | if (sensitive_data.nkeys != 0) { | |
726 | for (i = 0; i < sensitive_data.nkeys; i++) { | |
727 | if (sensitive_data.keys[i] != NULL) { | |
728 | /* Destroys contents safely */ | |
729 | debug3("clear hostkey %d", i); | |
730 | key_free(sensitive_data.keys[i]); | |
731 | sensitive_data.keys[i] = NULL; | |
732 | } | |
733 | } | |
734 | xfree(sensitive_data.keys); | |
735 | } | |
736 | for (i = 0; i < options.num_identity_files; i++) { | |
737 | if (options.identity_files[i]) { | |
738 | xfree(options.identity_files[i]); | |
739 | options.identity_files[i] = NULL; | |
740 | } | |
741 | if (options.identity_keys[i]) { | |
742 | key_free(options.identity_keys[i]); | |
743 | options.identity_keys[i] = NULL; | |
744 | } | |
745 | } | |
746 | ||
747 | exit_status = compat20 ? ssh_session2() : ssh_session(); | |
748 | packet_close(); | |
41b2f314 | 749 | |
c9f39d2c | 750 | if (options.control_path != NULL && control_fd != -1) |
751 | unlink(options.control_path); | |
752 | ||
41b2f314 | 753 | /* |
cdd66111 | 754 | * Send SIGHUP to proxy command if used. We don't wait() in |
41b2f314 | 755 | * case it hangs and instead rely on init to reap the child |
756 | */ | |
757 | if (proxy_command_pid > 1) | |
758 | kill(proxy_command_pid, SIGHUP); | |
759 | ||
3c0ef626 | 760 | return exit_status; |
761 | } | |
762 | ||
3c0ef626 | 763 | static void |
764 | ssh_init_forwarding(void) | |
765 | { | |
766 | int success = 0; | |
767 | int i; | |
768 | ||
769 | /* Initiate local TCP/IP port forwardings. */ | |
770 | for (i = 0; i < options.num_local_forwards; i++) { | |
996d5e62 | 771 | debug("Local connections to %.200s:%d forwarded to remote " |
772 | "address %.200s:%d", | |
dec6d9fe | 773 | (options.local_forwards[i].listen_host == NULL) ? |
774 | (options.gateway_ports ? "*" : "LOCALHOST") : | |
996d5e62 | 775 | options.local_forwards[i].listen_host, |
776 | options.local_forwards[i].listen_port, | |
777 | options.local_forwards[i].connect_host, | |
778 | options.local_forwards[i].connect_port); | |
e9a17296 | 779 | success += channel_setup_local_fwd_listener( |
996d5e62 | 780 | options.local_forwards[i].listen_host, |
781 | options.local_forwards[i].listen_port, | |
782 | options.local_forwards[i].connect_host, | |
783 | options.local_forwards[i].connect_port, | |
3c0ef626 | 784 | options.gateway_ports); |
785 | } | |
786 | if (i > 0 && success == 0) | |
787 | error("Could not request local forwarding."); | |
788 | ||
789 | /* Initiate remote TCP/IP port forwardings. */ | |
790 | for (i = 0; i < options.num_remote_forwards; i++) { | |
996d5e62 | 791 | debug("Remote connections from %.200s:%d forwarded to " |
792 | "local address %.200s:%d", | |
665a873d | 793 | (options.remote_forwards[i].listen_host == NULL) ? |
794 | (options.gateway_ports ? "*" : "LOCALHOST") : | |
996d5e62 | 795 | options.remote_forwards[i].listen_host, |
796 | options.remote_forwards[i].listen_port, | |
797 | options.remote_forwards[i].connect_host, | |
798 | options.remote_forwards[i].connect_port); | |
3c0ef626 | 799 | channel_request_remote_forwarding( |
996d5e62 | 800 | options.remote_forwards[i].listen_host, |
801 | options.remote_forwards[i].listen_port, | |
802 | options.remote_forwards[i].connect_host, | |
803 | options.remote_forwards[i].connect_port); | |
3c0ef626 | 804 | } |
805 | } | |
806 | ||
807 | static void | |
808 | check_agent_present(void) | |
809 | { | |
810 | if (options.forward_agent) { | |
811 | /* Clear agent forwarding if we don\'t have an agent. */ | |
41b2f314 | 812 | if (!ssh_agent_present()) |
3c0ef626 | 813 | options.forward_agent = 0; |
3c0ef626 | 814 | } |
815 | } | |
816 | ||
817 | static int | |
818 | ssh_session(void) | |
819 | { | |
820 | int type; | |
3c0ef626 | 821 | int interactive = 0; |
822 | int have_tty = 0; | |
823 | struct winsize ws; | |
824 | char *cp; | |
665a873d | 825 | const char *display; |
3c0ef626 | 826 | |
827 | /* Enable compression if requested. */ | |
828 | if (options.compression) { | |
829 | debug("Requesting compression at level %d.", options.compression_level); | |
830 | ||
831 | if (options.compression_level < 1 || options.compression_level > 9) | |
832 | fatal("Compression level must be from 1 (fast) to 9 (slow, best)."); | |
833 | ||
834 | /* Send the request. */ | |
835 | packet_start(SSH_CMSG_REQUEST_COMPRESSION); | |
836 | packet_put_int(options.compression_level); | |
837 | packet_send(); | |
838 | packet_write_wait(); | |
e9a17296 | 839 | type = packet_read(); |
3c0ef626 | 840 | if (type == SSH_SMSG_SUCCESS) |
841 | packet_start_compression(options.compression_level); | |
842 | else if (type == SSH_SMSG_FAILURE) | |
0fff78ff | 843 | logit("Warning: Remote host refused compression."); |
3c0ef626 | 844 | else |
845 | packet_disconnect("Protocol error waiting for compression response."); | |
846 | } | |
847 | /* Allocate a pseudo tty if appropriate. */ | |
848 | if (tty_flag) { | |
849 | debug("Requesting pty."); | |
850 | ||
851 | /* Start the packet. */ | |
852 | packet_start(SSH_CMSG_REQUEST_PTY); | |
853 | ||
854 | /* Store TERM in the packet. There is no limit on the | |
855 | length of the string. */ | |
856 | cp = getenv("TERM"); | |
857 | if (!cp) | |
858 | cp = ""; | |
859 | packet_put_cstring(cp); | |
860 | ||
861 | /* Store window size in the packet. */ | |
862 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) | |
863 | memset(&ws, 0, sizeof(ws)); | |
864 | packet_put_int(ws.ws_row); | |
865 | packet_put_int(ws.ws_col); | |
866 | packet_put_int(ws.ws_xpixel); | |
867 | packet_put_int(ws.ws_ypixel); | |
868 | ||
869 | /* Store tty modes in the packet. */ | |
870 | tty_make_modes(fileno(stdin), NULL); | |
871 | ||
872 | /* Send the packet, and wait for it to leave. */ | |
873 | packet_send(); | |
874 | packet_write_wait(); | |
875 | ||
876 | /* Read response from the server. */ | |
e9a17296 | 877 | type = packet_read(); |
3c0ef626 | 878 | if (type == SSH_SMSG_SUCCESS) { |
879 | interactive = 1; | |
880 | have_tty = 1; | |
881 | } else if (type == SSH_SMSG_FAILURE) | |
0fff78ff | 882 | logit("Warning: Remote host failed or refused to allocate a pseudo tty."); |
3c0ef626 | 883 | else |
884 | packet_disconnect("Protocol error waiting for pty request response."); | |
885 | } | |
886 | /* Request X11 forwarding if enabled and DISPLAY is set. */ | |
665a873d | 887 | display = getenv("DISPLAY"); |
888 | if (options.forward_x11 && display != NULL) { | |
e9a17296 | 889 | char *proto, *data; |
3c0ef626 | 890 | /* Get reasonable local authentication information. */ |
665a873d | 891 | client_x11_get_proto(display, options.xauth_location, |
892 | options.forward_x11_trusted, &proto, &data); | |
3c0ef626 | 893 | /* Request forwarding with authentication spoofing. */ |
894 | debug("Requesting X11 forwarding with authentication spoofing."); | |
665a873d | 895 | x11_request_forwarding_with_spoofing(0, display, proto, data); |
3c0ef626 | 896 | |
897 | /* Read response from the server. */ | |
e9a17296 | 898 | type = packet_read(); |
3c0ef626 | 899 | if (type == SSH_SMSG_SUCCESS) { |
900 | interactive = 1; | |
901 | } else if (type == SSH_SMSG_FAILURE) { | |
0fff78ff | 902 | logit("Warning: Remote host denied X11 forwarding."); |
3c0ef626 | 903 | } else { |
904 | packet_disconnect("Protocol error waiting for X11 forwarding"); | |
905 | } | |
906 | } | |
907 | /* Tell the packet module whether this is an interactive session. */ | |
908 | packet_set_interactive(interactive); | |
909 | ||
910 | /* Request authentication agent forwarding if appropriate. */ | |
911 | check_agent_present(); | |
912 | ||
913 | if (options.forward_agent) { | |
914 | debug("Requesting authentication agent forwarding."); | |
915 | auth_request_forwarding(); | |
916 | ||
917 | /* Read response from the server. */ | |
e9a17296 | 918 | type = packet_read(); |
919 | packet_check_eom(); | |
3c0ef626 | 920 | if (type != SSH_SMSG_SUCCESS) |
0fff78ff | 921 | logit("Warning: Remote host denied authentication agent forwarding."); |
3c0ef626 | 922 | } |
923 | ||
924 | /* Initiate port forwardings. */ | |
925 | ssh_init_forwarding(); | |
926 | ||
927 | /* If requested, let ssh continue in the background. */ | |
928 | if (fork_after_authentication_flag) | |
929 | if (daemon(1, 1) < 0) | |
930 | fatal("daemon() failed: %.200s", strerror(errno)); | |
931 | ||
932 | /* | |
933 | * If a command was specified on the command line, execute the | |
934 | * command now. Otherwise request the server to start a shell. | |
935 | */ | |
936 | if (buffer_len(&command) > 0) { | |
937 | int len = buffer_len(&command); | |
938 | if (len > 900) | |
939 | len = 900; | |
e9a17296 | 940 | debug("Sending command: %.*s", len, (u_char *)buffer_ptr(&command)); |
3c0ef626 | 941 | packet_start(SSH_CMSG_EXEC_CMD); |
942 | packet_put_string(buffer_ptr(&command), buffer_len(&command)); | |
943 | packet_send(); | |
944 | packet_write_wait(); | |
945 | } else { | |
946 | debug("Requesting shell."); | |
947 | packet_start(SSH_CMSG_EXEC_SHELL); | |
948 | packet_send(); | |
949 | packet_write_wait(); | |
950 | } | |
951 | ||
952 | /* Enter the interactive session. */ | |
953 | return client_loop(have_tty, tty_flag ? | |
954 | options.escape_char : SSH_ESCAPECHAR_NONE, 0); | |
955 | } | |
956 | ||
957 | static void | |
c9f39d2c | 958 | ssh_subsystem_reply(int type, u_int32_t seq, void *ctxt) |
3c0ef626 | 959 | { |
960 | int id, len; | |
961 | ||
962 | id = packet_get_int(); | |
963 | len = buffer_len(&command); | |
964 | if (len > 900) | |
965 | len = 900; | |
e9a17296 | 966 | packet_check_eom(); |
3c0ef626 | 967 | if (type == SSH2_MSG_CHANNEL_FAILURE) |
968 | fatal("Request for subsystem '%.*s' failed on channel %d", | |
e9a17296 | 969 | len, (u_char *)buffer_ptr(&command), id); |
3c0ef626 | 970 | } |
971 | ||
700318f3 | 972 | void |
cdd66111 | 973 | client_global_request_reply_fwd(int type, u_int32_t seq, void *ctxt) |
700318f3 | 974 | { |
975 | int i; | |
976 | ||
977 | i = client_global_request_id++; | |
cdd66111 | 978 | if (i >= options.num_remote_forwards) |
700318f3 | 979 | return; |
700318f3 | 980 | debug("remote forward %s for: listen %d, connect %s:%d", |
981 | type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure", | |
996d5e62 | 982 | options.remote_forwards[i].listen_port, |
983 | options.remote_forwards[i].connect_host, | |
984 | options.remote_forwards[i].connect_port); | |
700318f3 | 985 | if (type == SSH2_MSG_REQUEST_FAILURE) |
996d5e62 | 986 | logit("Warning: remote port forwarding failed for listen " |
987 | "port %d", options.remote_forwards[i].listen_port); | |
700318f3 | 988 | } |
989 | ||
3c0ef626 | 990 | static void |
c9f39d2c | 991 | ssh_control_listener(void) |
3c0ef626 | 992 | { |
c9f39d2c | 993 | struct sockaddr_un addr; |
994 | mode_t old_umask; | |
995 | int addr_len; | |
3c0ef626 | 996 | |
665a873d | 997 | if (options.control_path == NULL || |
998 | options.control_master == SSHCTL_MASTER_NO) | |
c9f39d2c | 999 | return; |
3c0ef626 | 1000 | |
665a873d | 1001 | debug("setting up multiplex master socket"); |
1002 | ||
c9f39d2c | 1003 | memset(&addr, '\0', sizeof(addr)); |
1004 | addr.sun_family = AF_UNIX; | |
1005 | addr_len = offsetof(struct sockaddr_un, sun_path) + | |
1006 | strlen(options.control_path) + 1; | |
3c0ef626 | 1007 | |
c9f39d2c | 1008 | if (strlcpy(addr.sun_path, options.control_path, |
1009 | sizeof(addr.sun_path)) >= sizeof(addr.sun_path)) | |
1010 | fatal("ControlPath too long"); | |
1011 | ||
1012 | if ((control_fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) | |
1013 | fatal("%s socket(): %s\n", __func__, strerror(errno)); | |
1014 | ||
1015 | old_umask = umask(0177); | |
1016 | if (bind(control_fd, (struct sockaddr*)&addr, addr_len) == -1) { | |
1017 | control_fd = -1; | |
dec6d9fe | 1018 | if (errno == EINVAL || errno == EADDRINUSE) |
c9f39d2c | 1019 | fatal("ControlSocket %s already exists", |
1020 | options.control_path); | |
1021 | else | |
1022 | fatal("%s bind(): %s\n", __func__, strerror(errno)); | |
3c0ef626 | 1023 | } |
c9f39d2c | 1024 | umask(old_umask); |
1025 | ||
1026 | if (listen(control_fd, 64) == -1) | |
1027 | fatal("%s listen(): %s\n", __func__, strerror(errno)); | |
1028 | ||
1029 | set_nonblock(control_fd); | |
1030 | } | |
1031 | ||
1032 | /* request pty/x11/agent/tcpfwd/shell for channel */ | |
1033 | static void | |
1034 | ssh_session2_setup(int id, void *arg) | |
1035 | { | |
1036 | extern char **environ; | |
665a873d | 1037 | const char *display; |
c9f39d2c | 1038 | int interactive = tty_flag; |
665a873d | 1039 | |
1040 | display = getenv("DISPLAY"); | |
1041 | if (options.forward_x11 && display != NULL) { | |
e9a17296 | 1042 | char *proto, *data; |
3c0ef626 | 1043 | /* Get reasonable local authentication information. */ |
665a873d | 1044 | client_x11_get_proto(display, options.xauth_location, |
1045 | options.forward_x11_trusted, &proto, &data); | |
3c0ef626 | 1046 | /* Request forwarding with authentication spoofing. */ |
1047 | debug("Requesting X11 forwarding with authentication spoofing."); | |
665a873d | 1048 | x11_request_forwarding_with_spoofing(id, display, proto, data); |
3c0ef626 | 1049 | interactive = 1; |
1050 | /* XXX wait for reply */ | |
1051 | } | |
1052 | ||
1053 | check_agent_present(); | |
1054 | if (options.forward_agent) { | |
1055 | debug("Requesting authentication agent forwarding."); | |
1056 | channel_request_start(id, "auth-agent-req@openssh.com", 0); | |
1057 | packet_send(); | |
1058 | } | |
1059 | ||
c9f39d2c | 1060 | client_session2_setup(id, tty_flag, subsystem_flag, getenv("TERM"), |
1061 | NULL, fileno(stdin), &command, environ, &ssh_subsystem_reply); | |
3c0ef626 | 1062 | |
3c0ef626 | 1063 | packet_set_interactive(interactive); |
1064 | } | |
1065 | ||
1066 | /* open new channel for a session */ | |
1067 | static int | |
1068 | ssh_session2_open(void) | |
1069 | { | |
1070 | Channel *c; | |
1071 | int window, packetmax, in, out, err; | |
1072 | ||
1073 | if (stdin_null_flag) { | |
1074 | in = open(_PATH_DEVNULL, O_RDONLY); | |
1075 | } else { | |
1076 | in = dup(STDIN_FILENO); | |
1077 | } | |
1078 | out = dup(STDOUT_FILENO); | |
1079 | err = dup(STDERR_FILENO); | |
1080 | ||
1081 | if (in < 0 || out < 0 || err < 0) | |
1082 | fatal("dup() in/out/err failed"); | |
1083 | ||
1084 | /* enable nonblocking unless tty */ | |
1085 | if (!isatty(in)) | |
1086 | set_nonblock(in); | |
1087 | if (!isatty(out)) | |
1088 | set_nonblock(out); | |
1089 | if (!isatty(err)) | |
1090 | set_nonblock(err); | |
1091 | ||
1092 | window = CHAN_SES_WINDOW_DEFAULT; | |
1093 | packetmax = CHAN_SES_PACKET_DEFAULT; | |
e9a17296 | 1094 | if (tty_flag) { |
1095 | window >>= 1; | |
1096 | packetmax >>= 1; | |
3c0ef626 | 1097 | } |
1098 | c = channel_new( | |
1099 | "session", SSH_CHANNEL_OPENING, in, out, err, | |
1100 | window, packetmax, CHAN_EXTENDED_WRITE, | |
0fff78ff | 1101 | "client-session", /*nonblock*/0); |
3c0ef626 | 1102 | |
1103 | debug3("ssh_session2_open: channel_new: %d", c->self); | |
1104 | ||
1105 | channel_send_open(c->self); | |
1106 | if (!no_shell_flag) | |
c9f39d2c | 1107 | channel_register_confirm(c->self, ssh_session2_setup, NULL); |
3c0ef626 | 1108 | |
1109 | return c->self; | |
1110 | } | |
1111 | ||
1112 | static int | |
1113 | ssh_session2(void) | |
1114 | { | |
1115 | int id = -1; | |
1116 | ||
1117 | /* XXX should be pre-session */ | |
1118 | ssh_init_forwarding(); | |
c9f39d2c | 1119 | ssh_control_listener(); |
3c0ef626 | 1120 | |
1121 | if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN)) | |
1122 | id = ssh_session2_open(); | |
1123 | ||
1124 | /* If requested, let ssh continue in the background. */ | |
1125 | if (fork_after_authentication_flag) | |
1126 | if (daemon(1, 1) < 0) | |
1127 | fatal("daemon() failed: %.200s", strerror(errno)); | |
1128 | ||
1129 | return client_loop(tty_flag, tty_flag ? | |
1130 | options.escape_char : SSH_ESCAPECHAR_NONE, id); | |
1131 | } | |
1132 | ||
1133 | static void | |
1134 | load_public_identity_files(void) | |
1135 | { | |
1136 | char *filename; | |
3c0ef626 | 1137 | int i = 0; |
700318f3 | 1138 | Key *public; |
3c0ef626 | 1139 | #ifdef SMARTCARD |
700318f3 | 1140 | Key **keys; |
1141 | ||
3c0ef626 | 1142 | if (options.smartcard_device != NULL && |
700318f3 | 1143 | options.num_identity_files < SSH_MAX_IDENTITY_FILES && |
1144 | (keys = sc_get_keys(options.smartcard_device, NULL)) != NULL ) { | |
1145 | int count = 0; | |
1146 | for (i = 0; keys[i] != NULL; i++) { | |
1147 | count++; | |
1148 | memmove(&options.identity_files[1], &options.identity_files[0], | |
1149 | sizeof(char *) * (SSH_MAX_IDENTITY_FILES - 1)); | |
1150 | memmove(&options.identity_keys[1], &options.identity_keys[0], | |
1151 | sizeof(Key *) * (SSH_MAX_IDENTITY_FILES - 1)); | |
1152 | options.num_identity_files++; | |
1153 | options.identity_keys[0] = keys[i]; | |
0fff78ff | 1154 | options.identity_files[0] = sc_get_key_label(keys[i]); |
700318f3 | 1155 | } |
1156 | if (options.num_identity_files > SSH_MAX_IDENTITY_FILES) | |
1157 | options.num_identity_files = SSH_MAX_IDENTITY_FILES; | |
1158 | i = count; | |
1159 | xfree(keys); | |
3c0ef626 | 1160 | } |
1161 | #endif /* SMARTCARD */ | |
1162 | for (; i < options.num_identity_files; i++) { | |
1163 | filename = tilde_expand_filename(options.identity_files[i], | |
1164 | original_real_uid); | |
1165 | public = key_load_public(filename, NULL); | |
1166 | debug("identity file %s type %d", filename, | |
1167 | public ? public->type : -1); | |
1168 | xfree(options.identity_files[i]); | |
1169 | options.identity_files[i] = filename; | |
1170 | options.identity_keys[i] = public; | |
1171 | } | |
1172 | } | |
c9f39d2c | 1173 | |
1174 | static void | |
1175 | control_client_sighandler(int signo) | |
1176 | { | |
1177 | control_client_terminate = signo; | |
1178 | } | |
1179 | ||
1180 | static void | |
1181 | control_client_sigrelay(int signo) | |
1182 | { | |
1183 | if (control_server_pid > 1) | |
1184 | kill(control_server_pid, signo); | |
1185 | } | |
1186 | ||
1187 | static int | |
1188 | env_permitted(char *env) | |
1189 | { | |
1190 | int i; | |
1191 | char name[1024], *cp; | |
1192 | ||
1193 | strlcpy(name, env, sizeof(name)); | |
1194 | if ((cp = strchr(name, '=')) == NULL) | |
1195 | return (0); | |
1196 | ||
1197 | *cp = '\0'; | |
1198 | ||
1199 | for (i = 0; i < options.num_send_env; i++) | |
1200 | if (match_pattern(name, options.send_env[i])) | |
1201 | return (1); | |
1202 | ||
1203 | return (0); | |
1204 | } | |
1205 | ||
1206 | static void | |
1207 | control_client(const char *path) | |
1208 | { | |
1209 | struct sockaddr_un addr; | |
996d5e62 | 1210 | int i, r, fd, sock, exitval, num_env, addr_len; |
c9f39d2c | 1211 | Buffer m; |
996d5e62 | 1212 | char *term; |
c9f39d2c | 1213 | extern char **environ; |
996d5e62 | 1214 | u_int flags; |
1215 | ||
665a873d | 1216 | if (mux_command == 0) |
1217 | mux_command = SSHMUX_COMMAND_OPEN; | |
1218 | ||
1219 | switch (options.control_master) { | |
1220 | case SSHCTL_MASTER_AUTO: | |
1221 | case SSHCTL_MASTER_AUTO_ASK: | |
1222 | debug("auto-mux: Trying existing master"); | |
1223 | /* FALLTHROUGH */ | |
1224 | case SSHCTL_MASTER_NO: | |
1225 | break; | |
1226 | default: | |
1227 | return; | |
996d5e62 | 1228 | } |
c9f39d2c | 1229 | |
1230 | memset(&addr, '\0', sizeof(addr)); | |
1231 | addr.sun_family = AF_UNIX; | |
1232 | addr_len = offsetof(struct sockaddr_un, sun_path) + | |
1233 | strlen(path) + 1; | |
1234 | ||
1235 | if (strlcpy(addr.sun_path, path, | |
1236 | sizeof(addr.sun_path)) >= sizeof(addr.sun_path)) | |
1237 | fatal("ControlPath too long"); | |
1238 | ||
1239 | if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) | |
1240 | fatal("%s socket(): %s", __func__, strerror(errno)); | |
1241 | ||
665a873d | 1242 | if (connect(sock, (struct sockaddr*)&addr, addr_len) == -1) { |
1243 | if (mux_command != SSHMUX_COMMAND_OPEN) { | |
1244 | fatal("Control socket connect(%.100s): %s", path, | |
1245 | strerror(errno)); | |
1246 | } | |
1247 | if (errno == ENOENT) | |
1248 | debug("Control socket \"%.100s\" does not exist", path); | |
1249 | else { | |
1250 | error("Control socket connect(%.100s): %s", path, | |
1251 | strerror(errno)); | |
1252 | } | |
1253 | close(sock); | |
1254 | return; | |
1255 | } | |
1256 | ||
1257 | if (stdin_null_flag) { | |
1258 | if ((fd = open(_PATH_DEVNULL, O_RDONLY)) == -1) | |
1259 | fatal("open(/dev/null): %s", strerror(errno)); | |
1260 | if (dup2(fd, STDIN_FILENO) == -1) | |
1261 | fatal("dup2: %s", strerror(errno)); | |
1262 | if (fd > STDERR_FILENO) | |
1263 | close(fd); | |
1264 | } | |
c9f39d2c | 1265 | |
665a873d | 1266 | term = getenv("TERM"); |
996d5e62 | 1267 | |
1268 | flags = 0; | |
1269 | if (tty_flag) | |
1270 | flags |= SSHMUX_FLAG_TTY; | |
1271 | if (subsystem_flag) | |
1272 | flags |= SSHMUX_FLAG_SUBSYS; | |
665a873d | 1273 | if (options.forward_x11) |
1274 | flags |= SSHMUX_FLAG_X11_FWD; | |
1275 | if (options.forward_agent) | |
1276 | flags |= SSHMUX_FLAG_AGENT_FWD; | |
c9f39d2c | 1277 | |
1278 | buffer_init(&m); | |
1279 | ||
996d5e62 | 1280 | /* Send our command to server */ |
1281 | buffer_put_int(&m, mux_command); | |
1282 | buffer_put_int(&m, flags); | |
665a873d | 1283 | if (ssh_msg_send(sock, SSHMUX_VER, &m) == -1) |
996d5e62 | 1284 | fatal("%s: msg_send", __func__); |
1285 | buffer_clear(&m); | |
1286 | ||
1287 | /* Get authorisation status and PID of controlee */ | |
c9f39d2c | 1288 | if (ssh_msg_recv(sock, &m) == -1) |
1289 | fatal("%s: msg_recv", __func__); | |
665a873d | 1290 | if (buffer_get_char(&m) != SSHMUX_VER) |
c9f39d2c | 1291 | fatal("%s: wrong version", __func__); |
c9f39d2c | 1292 | if (buffer_get_int(&m) != 1) |
1293 | fatal("Connection to master denied"); | |
1294 | control_server_pid = buffer_get_int(&m); | |
1295 | ||
1296 | buffer_clear(&m); | |
c9f39d2c | 1297 | |
996d5e62 | 1298 | switch (mux_command) { |
1299 | case SSHMUX_COMMAND_ALIVE_CHECK: | |
dec6d9fe | 1300 | fprintf(stderr, "Master running (pid=%d)\r\n", |
996d5e62 | 1301 | control_server_pid); |
1302 | exit(0); | |
1303 | case SSHMUX_COMMAND_TERMINATE: | |
1304 | fprintf(stderr, "Exit request sent.\r\n"); | |
1305 | exit(0); | |
1306 | case SSHMUX_COMMAND_OPEN: | |
1307 | /* continue below */ | |
1308 | break; | |
1309 | default: | |
1310 | fatal("silly mux_command %d", mux_command); | |
1311 | } | |
1312 | ||
1313 | /* SSHMUX_COMMAND_OPEN */ | |
665a873d | 1314 | buffer_put_cstring(&m, term ? term : ""); |
c9f39d2c | 1315 | buffer_append(&command, "\0", 1); |
1316 | buffer_put_cstring(&m, buffer_ptr(&command)); | |
1317 | ||
1318 | if (options.num_send_env == 0 || environ == NULL) { | |
1319 | buffer_put_int(&m, 0); | |
1320 | } else { | |
1321 | /* Pass environment */ | |
1322 | num_env = 0; | |
1323 | for (i = 0; environ[i] != NULL; i++) | |
1324 | if (env_permitted(environ[i])) | |
1325 | num_env++; /* Count */ | |
1326 | ||
1327 | buffer_put_int(&m, num_env); | |
1328 | ||
1329 | for (i = 0; environ[i] != NULL && num_env >= 0; i++) | |
1330 | if (env_permitted(environ[i])) { | |
1331 | num_env--; | |
1332 | buffer_put_cstring(&m, environ[i]); | |
1333 | } | |
1334 | } | |
1335 | ||
665a873d | 1336 | if (ssh_msg_send(sock, SSHMUX_VER, &m) == -1) |
c9f39d2c | 1337 | fatal("%s: msg_send", __func__); |
1338 | ||
1339 | mm_send_fd(sock, STDIN_FILENO); | |
1340 | mm_send_fd(sock, STDOUT_FILENO); | |
1341 | mm_send_fd(sock, STDERR_FILENO); | |
1342 | ||
1343 | /* Wait for reply, so master has a chance to gather ttymodes */ | |
1344 | buffer_clear(&m); | |
1345 | if (ssh_msg_recv(sock, &m) == -1) | |
1346 | fatal("%s: msg_recv", __func__); | |
665a873d | 1347 | if (buffer_get_char(&m) != SSHMUX_VER) |
996d5e62 | 1348 | fatal("%s: wrong version", __func__); |
c9f39d2c | 1349 | buffer_free(&m); |
1350 | ||
996d5e62 | 1351 | signal(SIGHUP, control_client_sighandler); |
c9f39d2c | 1352 | signal(SIGINT, control_client_sighandler); |
1353 | signal(SIGTERM, control_client_sighandler); | |
1354 | signal(SIGWINCH, control_client_sigrelay); | |
1355 | ||
1356 | if (tty_flag) | |
1357 | enter_raw_mode(); | |
1358 | ||
1359 | /* Stick around until the controlee closes the client_fd */ | |
1360 | exitval = 0; | |
1361 | for (;!control_client_terminate;) { | |
1362 | r = read(sock, &exitval, sizeof(exitval)); | |
1363 | if (r == 0) { | |
1364 | debug2("Received EOF from master"); | |
1365 | break; | |
1366 | } | |
1367 | if (r > 0) | |
1368 | debug2("Received exit status from master %d", exitval); | |
1369 | if (r == -1 && errno != EINTR) | |
1370 | fatal("%s: read %s", __func__, strerror(errno)); | |
1371 | } | |
1372 | ||
1373 | if (control_client_terminate) | |
1374 | debug2("Exiting on signal %d", control_client_terminate); | |
1375 | ||
1376 | close(sock); | |
1377 | ||
1378 | leave_raw_mode(); | |
1379 | ||
1380 | if (tty_flag && options.log_level != SYSLOG_LEVEL_QUIET) | |
1381 | fprintf(stderr, "Connection to master closed.\r\n"); | |
1382 | ||
1383 | exit(exitval); | |
1384 | } |