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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. | |
416fd2a8 | 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" | |
1b56ff3d | 43 | RCSID("$OpenBSD: ssh.c,v 1.224 2004/07/28 09:40:29 markus 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" | |
1b56ff3d | 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" | |
1b56ff3d | 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" | |
1b56ff3d | 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 | |
ff2d7a98 | 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. */ | |
ff2d7a98 | 126 | Sensitive sensitive_data; |
3c0ef626 | 127 | |
128 | /* Original real UID. */ | |
129 | uid_t original_real_uid; | |
ff2d7a98 | 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 | ||
2980ea68 | 138 | /* # of replies received for global requests */ |
139 | static int client_global_request_id = 0; | |
140 | ||
e54b3d7c | 141 | /* pid of proxycommand child process */ |
142 | pid_t proxy_command_pid = 0; | |
143 | ||
1b56ff3d | 144 | /* fd to control socket */ |
145 | int control_fd = -1; | |
146 | ||
147 | /* Only used in control client mode */ | |
148 | volatile sig_atomic_t control_client_terminate = 0; | |
149 | u_int control_server_pid = 0; | |
150 | ||
3c0ef626 | 151 | /* Prints a help message to the user. This function never returns. */ |
152 | ||
153 | static void | |
154 | usage(void) | |
155 | { | |
2a304a95 | 156 | fprintf(stderr, |
1b56ff3d | 157 | "usage: ssh [-1246AaCfghkMNnqsTtVvXxY] [-b bind_address] [-c cipher_spec]\n" |
2a304a95 | 158 | " [-D port] [-e escape_char] [-F configfile] [-i identity_file]\n" |
159 | " [-L port:host:hostport] [-l login_name] [-m mac_spec] [-o option]\n" | |
1b56ff3d | 160 | " [-p port] [-R port:host:hostport] [-S ctl] [user@]hostname [command]\n" |
2a304a95 | 161 | ); |
3c0ef626 | 162 | exit(1); |
163 | } | |
164 | ||
3c0ef626 | 165 | static int ssh_session(void); |
166 | static int ssh_session2(void); | |
167 | static void load_public_identity_files(void); | |
1b56ff3d | 168 | static void control_client(const char *path); |
3c0ef626 | 169 | |
170 | /* | |
171 | * Main program for the ssh client. | |
172 | */ | |
173 | int | |
174 | main(int ac, char **av) | |
175 | { | |
ff2d7a98 | 176 | int i, opt, exit_status; |
3c0ef626 | 177 | u_short fwd_port, fwd_host_port; |
178 | char sfwd_port[6], sfwd_host_port[6]; | |
416fd2a8 | 179 | char *p, *cp, *line, buf[256]; |
3c0ef626 | 180 | struct stat st; |
181 | struct passwd *pw; | |
182 | int dummy; | |
3c0ef626 | 183 | extern int optind, optreset; |
184 | extern char *optarg; | |
185 | ||
70791e56 | 186 | __progname = ssh_get_progname(av[0]); |
ae43c103 | 187 | init_pathnames(); |
3c0ef626 | 188 | init_rng(); |
189 | ||
190 | /* | |
191 | * Save the original real uid. It will be needed later (uid-swapping | |
192 | * may clobber the real uid). | |
193 | */ | |
194 | original_real_uid = getuid(); | |
195 | original_effective_uid = geteuid(); | |
416fd2a8 | 196 | |
e54b3d7c | 197 | /* |
198 | * Use uid-swapping to give up root privileges for the duration of | |
199 | * option processing. We will re-instantiate the rights when we are | |
200 | * ready to create the privileged port, and will permanently drop | |
201 | * them when the port has been created (actually, when the connection | |
202 | * has been made, as we may need to create the port several times). | |
203 | */ | |
204 | PRIV_END; | |
3c0ef626 | 205 | |
206 | #ifdef HAVE_SETRLIMIT | |
207 | /* If we are installed setuid root be careful to not drop core. */ | |
208 | if (original_real_uid != original_effective_uid) { | |
209 | struct rlimit rlim; | |
210 | rlim.rlim_cur = rlim.rlim_max = 0; | |
211 | if (setrlimit(RLIMIT_CORE, &rlim) < 0) | |
212 | fatal("setrlimit failed: %.100s", strerror(errno)); | |
213 | } | |
214 | #endif | |
215 | /* Get user data. */ | |
216 | pw = getpwuid(original_real_uid); | |
217 | if (!pw) { | |
70791e56 | 218 | logit("You don't exist, go away!"); |
3c0ef626 | 219 | exit(1); |
220 | } | |
221 | /* Take a copy of the returned structure. */ | |
222 | pw = pwcopy(pw); | |
223 | ||
3c0ef626 | 224 | /* |
225 | * Set our umask to something reasonable, as some files are created | |
226 | * with the default umask. This will make them world-readable but | |
227 | * writable only by the owner, which is ok for all files for which we | |
228 | * don't set the modes explicitly. | |
229 | */ | |
230 | umask(022); | |
231 | ||
232 | /* Initialize option structure to indicate that no values have been set. */ | |
233 | initialize_options(&options); | |
234 | ||
235 | /* Parse command-line arguments. */ | |
236 | host = NULL; | |
237 | ||
238 | again: | |
239 | while ((opt = getopt(ac, av, | |
1b56ff3d | 240 | "1246ab:c:e:fgi:kl:m:no:p:qstvxACD:F:I:L:MNPR:S:TVXY")) != -1) { |
3c0ef626 | 241 | switch (opt) { |
242 | case '1': | |
243 | options.protocol = SSH_PROTO_1; | |
244 | break; | |
245 | case '2': | |
246 | options.protocol = SSH_PROTO_2; | |
247 | break; | |
248 | case '4': | |
70791e56 | 249 | options.address_family = AF_INET; |
3c0ef626 | 250 | break; |
251 | case '6': | |
70791e56 | 252 | options.address_family = AF_INET6; |
3c0ef626 | 253 | break; |
254 | case 'n': | |
255 | stdin_null_flag = 1; | |
256 | break; | |
257 | case 'f': | |
258 | fork_after_authentication_flag = 1; | |
259 | stdin_null_flag = 1; | |
260 | break; | |
261 | case 'x': | |
262 | options.forward_x11 = 0; | |
263 | break; | |
264 | case 'X': | |
265 | options.forward_x11 = 1; | |
266 | break; | |
416fd2a8 | 267 | case 'Y': |
268 | options.forward_x11 = 1; | |
269 | options.forward_x11_trusted = 1; | |
270 | break; | |
3c0ef626 | 271 | case 'g': |
272 | options.gateway_ports = 1; | |
273 | break; | |
e54b3d7c | 274 | case 'P': /* deprecated */ |
3c0ef626 | 275 | options.use_privileged_port = 0; |
276 | break; | |
277 | case 'a': | |
278 | options.forward_agent = 0; | |
279 | break; | |
280 | case 'A': | |
281 | options.forward_agent = 1; | |
282 | break; | |
3c0ef626 | 283 | case 'k': |
416fd2a8 | 284 | options.gss_deleg_creds = 0; |
3c0ef626 | 285 | break; |
3c0ef626 | 286 | case 'i': |
287 | if (stat(optarg, &st) < 0) { | |
288 | fprintf(stderr, "Warning: Identity file %s " | |
289 | "does not exist.\n", optarg); | |
290 | break; | |
291 | } | |
292 | if (options.num_identity_files >= | |
293 | SSH_MAX_IDENTITY_FILES) | |
294 | fatal("Too many identity files specified " | |
295 | "(max %d)", SSH_MAX_IDENTITY_FILES); | |
296 | options.identity_files[options.num_identity_files++] = | |
297 | xstrdup(optarg); | |
298 | break; | |
299 | case 'I': | |
300 | #ifdef SMARTCARD | |
301 | options.smartcard_device = xstrdup(optarg); | |
302 | #else | |
303 | fprintf(stderr, "no support for smartcards.\n"); | |
304 | #endif | |
305 | break; | |
306 | case 't': | |
307 | if (tty_flag) | |
308 | force_tty_flag = 1; | |
309 | tty_flag = 1; | |
310 | break; | |
311 | case 'v': | |
70791e56 | 312 | if (debug_flag == 0) { |
3c0ef626 | 313 | debug_flag = 1; |
314 | options.log_level = SYSLOG_LEVEL_DEBUG1; | |
70791e56 | 315 | } else { |
316 | if (options.log_level < SYSLOG_LEVEL_DEBUG3) | |
317 | options.log_level++; | |
3c0ef626 | 318 | break; |
70791e56 | 319 | } |
3c0ef626 | 320 | /* fallthrough */ |
321 | case 'V': | |
2a304a95 | 322 | fprintf(stderr, "%s, %s\n", |
323 | SSH_VERSION, SSLeay_version(SSLEAY_VERSION)); | |
3c0ef626 | 324 | if (opt == 'V') |
325 | exit(0); | |
326 | break; | |
327 | case 'q': | |
328 | options.log_level = SYSLOG_LEVEL_QUIET; | |
329 | break; | |
330 | case 'e': | |
331 | if (optarg[0] == '^' && optarg[2] == 0 && | |
332 | (u_char) optarg[1] >= 64 && | |
333 | (u_char) optarg[1] < 128) | |
334 | options.escape_char = (u_char) optarg[1] & 31; | |
335 | else if (strlen(optarg) == 1) | |
336 | options.escape_char = (u_char) optarg[0]; | |
337 | else if (strcmp(optarg, "none") == 0) | |
338 | options.escape_char = SSH_ESCAPECHAR_NONE; | |
339 | else { | |
340 | fprintf(stderr, "Bad escape character '%s'.\n", | |
341 | optarg); | |
342 | exit(1); | |
343 | } | |
344 | break; | |
345 | case 'c': | |
346 | if (ciphers_valid(optarg)) { | |
347 | /* SSH2 only */ | |
348 | options.ciphers = xstrdup(optarg); | |
1b56ff3d | 349 | options.cipher = SSH_CIPHER_INVALID; |
3c0ef626 | 350 | } else { |
351 | /* SSH1 only */ | |
352 | options.cipher = cipher_number(optarg); | |
353 | if (options.cipher == -1) { | |
354 | fprintf(stderr, | |
355 | "Unknown cipher type '%s'\n", | |
356 | optarg); | |
357 | exit(1); | |
358 | } | |
359 | if (options.cipher == SSH_CIPHER_3DES) | |
360 | options.ciphers = "3des-cbc"; | |
361 | else if (options.cipher == SSH_CIPHER_BLOWFISH) | |
362 | options.ciphers = "blowfish-cbc"; | |
363 | else | |
364 | options.ciphers = (char *)-1; | |
365 | } | |
366 | break; | |
367 | case 'm': | |
368 | if (mac_valid(optarg)) | |
369 | options.macs = xstrdup(optarg); | |
370 | else { | |
371 | fprintf(stderr, "Unknown mac type '%s'\n", | |
372 | optarg); | |
373 | exit(1); | |
374 | } | |
375 | break; | |
1b56ff3d | 376 | case 'M': |
377 | options.control_master = | |
378 | (options.control_master >= 1) ? 2 : 1; | |
379 | break; | |
3c0ef626 | 380 | case 'p': |
381 | options.port = a2port(optarg); | |
382 | if (options.port == 0) { | |
383 | fprintf(stderr, "Bad port '%s'\n", optarg); | |
384 | exit(1); | |
385 | } | |
386 | break; | |
387 | case 'l': | |
388 | options.user = optarg; | |
389 | break; | |
390 | ||
391 | case 'L': | |
392 | case 'R': | |
70791e56 | 393 | if (sscanf(optarg, "%5[0123456789]:%255[^:]:%5[0123456789]", |
3c0ef626 | 394 | sfwd_port, buf, sfwd_host_port) != 3 && |
70791e56 | 395 | sscanf(optarg, "%5[0123456789]/%255[^/]/%5[0123456789]", |
3c0ef626 | 396 | sfwd_port, buf, sfwd_host_port) != 3) { |
397 | fprintf(stderr, | |
398 | "Bad forwarding specification '%s'\n", | |
399 | optarg); | |
400 | usage(); | |
401 | /* NOTREACHED */ | |
402 | } | |
403 | if ((fwd_port = a2port(sfwd_port)) == 0 || | |
2980ea68 | 404 | (fwd_host_port = a2port(sfwd_host_port)) == 0) { |
3c0ef626 | 405 | fprintf(stderr, |
406 | "Bad forwarding port(s) '%s'\n", optarg); | |
407 | exit(1); | |
408 | } | |
409 | if (opt == 'L') | |
410 | add_local_forward(&options, fwd_port, buf, | |
411 | fwd_host_port); | |
412 | else if (opt == 'R') | |
413 | add_remote_forward(&options, fwd_port, buf, | |
e9a17296 | 414 | fwd_host_port); |
3c0ef626 | 415 | break; |
416 | ||
417 | case 'D': | |
418 | fwd_port = a2port(optarg); | |
419 | if (fwd_port == 0) { | |
420 | fprintf(stderr, "Bad dynamic port '%s'\n", | |
421 | optarg); | |
422 | exit(1); | |
423 | } | |
70791e56 | 424 | add_local_forward(&options, fwd_port, "socks", 0); |
3c0ef626 | 425 | break; |
426 | ||
427 | case 'C': | |
428 | options.compression = 1; | |
429 | break; | |
430 | case 'N': | |
431 | no_shell_flag = 1; | |
432 | no_tty_flag = 1; | |
433 | break; | |
434 | case 'T': | |
435 | no_tty_flag = 1; | |
436 | break; | |
437 | case 'o': | |
438 | dummy = 1; | |
416fd2a8 | 439 | line = xstrdup(optarg); |
3c0ef626 | 440 | if (process_config_line(&options, host ? host : "", |
416fd2a8 | 441 | line, "command-line", 0, &dummy) != 0) |
3c0ef626 | 442 | exit(1); |
416fd2a8 | 443 | xfree(line); |
3c0ef626 | 444 | break; |
445 | case 's': | |
446 | subsystem_flag = 1; | |
447 | break; | |
1b56ff3d | 448 | case 'S': |
449 | if (options.control_path != NULL) | |
450 | free(options.control_path); | |
451 | options.control_path = xstrdup(optarg); | |
452 | break; | |
3c0ef626 | 453 | case 'b': |
454 | options.bind_address = optarg; | |
455 | break; | |
456 | case 'F': | |
457 | config = optarg; | |
458 | break; | |
459 | default: | |
460 | usage(); | |
461 | } | |
462 | } | |
463 | ||
464 | ac -= optind; | |
465 | av += optind; | |
466 | ||
467 | if (ac > 0 && !host && **av != '-') { | |
1c14df9e | 468 | if (strrchr(*av, '@')) { |
3c0ef626 | 469 | p = xstrdup(*av); |
1c14df9e | 470 | cp = strrchr(p, '@'); |
3c0ef626 | 471 | if (cp == NULL || cp == p) |
472 | usage(); | |
473 | options.user = p; | |
474 | *cp = '\0'; | |
475 | host = ++cp; | |
476 | } else | |
477 | host = *av; | |
1c14df9e | 478 | if (ac > 1) { |
479 | optind = optreset = 1; | |
3c0ef626 | 480 | goto again; |
481 | } | |
1c14df9e | 482 | ac--, av++; |
3c0ef626 | 483 | } |
484 | ||
485 | /* Check that we got a host name. */ | |
486 | if (!host) | |
487 | usage(); | |
488 | ||
489 | SSLeay_add_all_algorithms(); | |
490 | ERR_load_crypto_strings(); | |
3c0ef626 | 491 | |
492 | /* Initialize the command to execute on remote host. */ | |
493 | buffer_init(&command); | |
494 | ||
495 | /* | |
496 | * Save the command to execute on the remote host in a buffer. There | |
497 | * is no limit on the length of the command, except by the maximum | |
498 | * packet size. Also sets the tty flag if there is no command. | |
499 | */ | |
500 | if (!ac) { | |
501 | /* No command specified - execute shell on a tty. */ | |
502 | tty_flag = 1; | |
503 | if (subsystem_flag) { | |
504 | fprintf(stderr, | |
505 | "You must specify a subsystem to invoke.\n"); | |
506 | usage(); | |
507 | } | |
508 | } else { | |
509 | /* A command has been specified. Store it into the buffer. */ | |
510 | for (i = 0; i < ac; i++) { | |
511 | if (i) | |
512 | buffer_append(&command, " ", 1); | |
513 | buffer_append(&command, av[i], strlen(av[i])); | |
514 | } | |
515 | } | |
516 | ||
517 | /* Cannot fork to background if no command. */ | |
518 | if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag) | |
519 | fatal("Cannot fork into background without a command to execute."); | |
520 | ||
521 | /* Allocate a tty by default if no command specified. */ | |
522 | if (buffer_len(&command) == 0) | |
523 | tty_flag = 1; | |
524 | ||
e54b3d7c | 525 | /* Force no tty */ |
3c0ef626 | 526 | if (no_tty_flag) |
527 | tty_flag = 0; | |
528 | /* Do not allocate a tty if stdin is not a tty. */ | |
529 | if (!isatty(fileno(stdin)) && !force_tty_flag) { | |
530 | if (tty_flag) | |
70791e56 | 531 | logit("Pseudo-terminal will not be allocated because stdin is not a terminal."); |
3c0ef626 | 532 | tty_flag = 0; |
533 | } | |
534 | ||
535 | /* | |
536 | * Initialize "log" output. Since we are the client all output | |
537 | * actually goes to stderr. | |
538 | */ | |
539 | log_init(av[0], options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level, | |
540 | SYSLOG_FACILITY_USER, 1); | |
541 | ||
542 | /* | |
543 | * Read per-user configuration file. Ignore the system wide config | |
544 | * file if the user specifies a config file on the command line. | |
545 | */ | |
546 | if (config != NULL) { | |
1b56ff3d | 547 | if (!read_config_file(config, host, &options, 0)) |
3c0ef626 | 548 | fatal("Can't open user config file %.100s: " |
549 | "%.100s", config, strerror(errno)); | |
550 | } else { | |
078f71c2 | 551 | /* |
552 | * Since the config file parsing code aborts if it sees | |
553 | * options it doesn't recognize, allow users to put | |
554 | * options specific to compile-time add-ons in alternate | |
555 | * config files so their primary config file will | |
556 | * interoperate SSH versions that don't support those | |
557 | * options. | |
558 | */ | |
559 | #ifdef GSSAPI | |
560 | snprintf(buf, sizeof buf, "%.100s/%.100s.gssapi", pw->pw_dir, | |
561 | _PATH_SSH_USER_CONFFILE); | |
1b56ff3d | 562 | (void)read_config_file(buf, host, &options, 1); |
078f71c2 | 563 | #ifdef GSI |
564 | snprintf(buf, sizeof buf, "%.100s/%.100s.gsi", pw->pw_dir, | |
565 | _PATH_SSH_USER_CONFFILE); | |
1b56ff3d | 566 | (void)read_config_file(buf, host, &options, 1); |
078f71c2 | 567 | #endif |
70791e56 | 568 | #if defined(KRB5) |
078f71c2 | 569 | snprintf(buf, sizeof buf, "%.100s/%.100s.krb", pw->pw_dir, |
570 | _PATH_SSH_USER_CONFFILE); | |
1b56ff3d | 571 | (void)read_config_file(buf, host, &options, 1); |
078f71c2 | 572 | #endif |
078f71c2 | 573 | #endif |
3c0ef626 | 574 | snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, |
575 | _PATH_SSH_USER_CONFFILE); | |
1b56ff3d | 576 | (void)read_config_file(buf, host, &options, 1); |
3c0ef626 | 577 | |
578 | /* Read systemwide configuration file after use config. */ | |
1b56ff3d | 579 | (void)read_config_file(_PATH_HOST_CONFIG_FILE, host, |
580 | &options, 0); | |
3c0ef626 | 581 | } |
582 | ||
583 | /* Fill configuration defaults. */ | |
584 | fill_default_options(&options); | |
585 | ||
70791e56 | 586 | channel_set_af(options.address_family); |
587 | ||
3c0ef626 | 588 | /* reinit */ |
589 | log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 1); | |
590 | ||
591 | seed_rng(); | |
592 | ||
70791e56 | 593 | if (options.user == NULL) { |
594 | options.user = xstrdup(pw->pw_name); | |
595 | options.implicit = 1; | |
596 | } | |
2980ea68 | 597 | else options.implicit = 0; |
3c0ef626 | 598 | |
599 | if (options.hostname != NULL) | |
600 | host = options.hostname; | |
601 | ||
70791e56 | 602 | /* force lowercase for hostkey matching */ |
603 | if (options.host_key_alias != NULL) { | |
604 | for (p = options.host_key_alias; *p; p++) | |
605 | if (isupper(*p)) | |
606 | *p = tolower(*p); | |
607 | } | |
608 | ||
1c14df9e | 609 | if (options.proxy_command != NULL && |
610 | strcmp(options.proxy_command, "none") == 0) | |
611 | options.proxy_command = NULL; | |
612 | ||
1b56ff3d | 613 | if (options.control_path != NULL) { |
614 | options.control_path = tilde_expand_filename( | |
615 | options.control_path, original_real_uid); | |
616 | } | |
617 | if (options.control_path != NULL && options.control_master == 0) | |
618 | control_client(options.control_path); /* This doesn't return */ | |
619 | ||
3c0ef626 | 620 | /* Open a connection to the remote host. */ |
70791e56 | 621 | if (ssh_connect(host, &hostaddr, options.port, |
622 | options.address_family, options.connection_attempts, | |
ff2d7a98 | 623 | #ifdef HAVE_CYGWIN |
624 | options.use_privileged_port, | |
625 | #else | |
626 | original_effective_uid == 0 && options.use_privileged_port, | |
627 | #endif | |
628 | options.proxy_command) != 0) | |
629 | exit(1); | |
3c0ef626 | 630 | |
631 | /* | |
632 | * If we successfully made the connection, load the host private key | |
633 | * in case we will need it later for combined rsa-rhosts | |
634 | * authentication. This must be done before releasing extra | |
635 | * privileges, because the file is only readable by root. | |
ff2d7a98 | 636 | * If we cannot access the private keys, load the public keys |
637 | * instead and try to execute the ssh-keysign helper instead. | |
3c0ef626 | 638 | */ |
639 | sensitive_data.nkeys = 0; | |
640 | sensitive_data.keys = NULL; | |
ff2d7a98 | 641 | sensitive_data.external_keysign = 0; |
642 | if (options.rhosts_rsa_authentication || | |
643 | options.hostbased_authentication) { | |
3c0ef626 | 644 | sensitive_data.nkeys = 3; |
e54b3d7c | 645 | sensitive_data.keys = xmalloc(sensitive_data.nkeys * |
646 | sizeof(Key)); | |
ff2d7a98 | 647 | |
648 | PRIV_START; | |
3c0ef626 | 649 | sensitive_data.keys[0] = key_load_private_type(KEY_RSA1, |
650 | _PATH_HOST_KEY_FILE, "", NULL); | |
651 | sensitive_data.keys[1] = key_load_private_type(KEY_DSA, | |
652 | _PATH_HOST_DSA_KEY_FILE, "", NULL); | |
653 | sensitive_data.keys[2] = key_load_private_type(KEY_RSA, | |
654 | _PATH_HOST_RSA_KEY_FILE, "", NULL); | |
ff2d7a98 | 655 | PRIV_END; |
656 | ||
e54b3d7c | 657 | if (options.hostbased_authentication == 1 && |
658 | sensitive_data.keys[0] == NULL && | |
ff2d7a98 | 659 | sensitive_data.keys[1] == NULL && |
660 | sensitive_data.keys[2] == NULL) { | |
661 | sensitive_data.keys[1] = key_load_public( | |
662 | _PATH_HOST_DSA_KEY_FILE, NULL); | |
663 | sensitive_data.keys[2] = key_load_public( | |
664 | _PATH_HOST_RSA_KEY_FILE, NULL); | |
665 | sensitive_data.external_keysign = 1; | |
666 | } | |
3c0ef626 | 667 | } |
668 | /* | |
669 | * Get rid of any extra privileges that we may have. We will no | |
670 | * longer need them. Also, extra privileges could make it very hard | |
671 | * to read identity files and other non-world-readable files from the | |
672 | * user's home directory if it happens to be on a NFS volume where | |
673 | * root is mapped to nobody. | |
674 | */ | |
1b56ff3d | 675 | if (original_effective_uid == 0) { |
676 | PRIV_START; | |
677 | permanently_set_uid(pw); | |
678 | } | |
3c0ef626 | 679 | |
680 | /* | |
681 | * Now that we are back to our own permissions, create ~/.ssh | |
682 | * directory if it doesn\'t already exist. | |
683 | */ | |
684 | snprintf(buf, sizeof buf, "%.100s%s%.100s", pw->pw_dir, strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR); | |
685 | if (stat(buf, &st) < 0) | |
686 | if (mkdir(buf, 0700) < 0) | |
687 | error("Could not create directory '%.200s'.", buf); | |
688 | ||
3c0ef626 | 689 | /* load options.identity_files */ |
690 | load_public_identity_files(); | |
691 | ||
692 | /* Expand ~ in known host file names. */ | |
693 | /* XXX mem-leaks: */ | |
694 | options.system_hostfile = | |
695 | tilde_expand_filename(options.system_hostfile, original_real_uid); | |
696 | options.user_hostfile = | |
697 | tilde_expand_filename(options.user_hostfile, original_real_uid); | |
698 | options.system_hostfile2 = | |
699 | tilde_expand_filename(options.system_hostfile2, original_real_uid); | |
700 | options.user_hostfile2 = | |
701 | tilde_expand_filename(options.user_hostfile2, original_real_uid); | |
702 | ||
703 | signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */ | |
704 | ||
705 | /* Log into the remote system. This never returns if the login fails. */ | |
ff2d7a98 | 706 | ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr, pw); |
3c0ef626 | 707 | |
708 | /* We no longer need the private host keys. Clear them now. */ | |
709 | if (sensitive_data.nkeys != 0) { | |
710 | for (i = 0; i < sensitive_data.nkeys; i++) { | |
711 | if (sensitive_data.keys[i] != NULL) { | |
712 | /* Destroys contents safely */ | |
713 | debug3("clear hostkey %d", i); | |
714 | key_free(sensitive_data.keys[i]); | |
715 | sensitive_data.keys[i] = NULL; | |
716 | } | |
717 | } | |
718 | xfree(sensitive_data.keys); | |
719 | } | |
720 | for (i = 0; i < options.num_identity_files; i++) { | |
721 | if (options.identity_files[i]) { | |
722 | xfree(options.identity_files[i]); | |
723 | options.identity_files[i] = NULL; | |
724 | } | |
725 | if (options.identity_keys[i]) { | |
726 | key_free(options.identity_keys[i]); | |
727 | options.identity_keys[i] = NULL; | |
728 | } | |
729 | } | |
730 | ||
731 | exit_status = compat20 ? ssh_session2() : ssh_session(); | |
732 | packet_close(); | |
e54b3d7c | 733 | |
1b56ff3d | 734 | if (options.control_path != NULL && control_fd != -1) |
735 | unlink(options.control_path); | |
736 | ||
e54b3d7c | 737 | /* |
416fd2a8 | 738 | * Send SIGHUP to proxy command if used. We don't wait() in |
e54b3d7c | 739 | * case it hangs and instead rely on init to reap the child |
740 | */ | |
741 | if (proxy_command_pid > 1) | |
742 | kill(proxy_command_pid, SIGHUP); | |
743 | ||
3c0ef626 | 744 | return exit_status; |
745 | } | |
746 | ||
416fd2a8 | 747 | #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1" |
748 | ||
3c0ef626 | 749 | static void |
e9a17296 | 750 | x11_get_proto(char **_proto, char **_data) |
3c0ef626 | 751 | { |
416fd2a8 | 752 | char cmd[1024]; |
3c0ef626 | 753 | char line[512]; |
416fd2a8 | 754 | char xdisplay[512]; |
e9a17296 | 755 | static char proto[512], data[512]; |
3c0ef626 | 756 | FILE *f; |
416fd2a8 | 757 | int got_data = 0, generated = 0, do_unlink = 0, i; |
758 | char *display, *xauthdir, *xauthfile; | |
e54b3d7c | 759 | struct stat st; |
3c0ef626 | 760 | |
416fd2a8 | 761 | xauthdir = xauthfile = NULL; |
e9a17296 | 762 | *_proto = proto; |
763 | *_data = data; | |
764 | proto[0] = data[0] = '\0'; | |
416fd2a8 | 765 | |
e54b3d7c | 766 | if (!options.xauth_location || |
767 | (stat(options.xauth_location, &st) == -1)) { | |
768 | debug("No xauth program."); | |
769 | } else { | |
770 | if ((display = getenv("DISPLAY")) == NULL) { | |
771 | debug("x11_get_proto: DISPLAY not set"); | |
772 | return; | |
773 | } | |
416fd2a8 | 774 | /* |
775 | * Handle FamilyLocal case where $DISPLAY does | |
776 | * not match an authorization entry. For this we | |
777 | * just try "xauth list unix:displaynum.screennum". | |
778 | * XXX: "localhost" match to determine FamilyLocal | |
779 | * is not perfect. | |
780 | */ | |
781 | if (strncmp(display, "localhost:", 10) == 0) { | |
782 | snprintf(xdisplay, sizeof(xdisplay), "unix:%s", | |
783 | display + 10); | |
784 | display = xdisplay; | |
785 | } | |
786 | if (options.forward_x11_trusted == 0) { | |
787 | xauthdir = xmalloc(MAXPATHLEN); | |
788 | xauthfile = xmalloc(MAXPATHLEN); | |
789 | strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN); | |
790 | if (mkdtemp(xauthdir) != NULL) { | |
791 | do_unlink = 1; | |
792 | snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile", | |
793 | xauthdir); | |
794 | snprintf(cmd, sizeof(cmd), | |
795 | "%s -f %s generate %s " SSH_X11_PROTO | |
2a304a95 | 796 | " untrusted timeout 1200 2>" _PATH_DEVNULL, |
416fd2a8 | 797 | options.xauth_location, xauthfile, display); |
798 | debug2("x11_get_proto: %s", cmd); | |
799 | if (system(cmd) == 0) | |
800 | generated = 1; | |
801 | } | |
802 | } | |
803 | snprintf(cmd, sizeof(cmd), | |
804 | "%s %s%s list %s . 2>" _PATH_DEVNULL, | |
805 | options.xauth_location, | |
806 | generated ? "-f " : "" , | |
807 | generated ? xauthfile : "", | |
808 | display); | |
809 | debug2("x11_get_proto: %s", cmd); | |
810 | f = popen(cmd, "r"); | |
3c0ef626 | 811 | if (f && fgets(line, sizeof(line), f) && |
e9a17296 | 812 | sscanf(line, "%*s %511s %511s", proto, data) == 2) |
3c0ef626 | 813 | got_data = 1; |
814 | if (f) | |
815 | pclose(f); | |
816 | } | |
416fd2a8 | 817 | |
818 | if (do_unlink) { | |
819 | unlink(xauthfile); | |
820 | rmdir(xauthdir); | |
821 | } | |
822 | if (xauthdir) | |
823 | xfree(xauthdir); | |
824 | if (xauthfile) | |
825 | xfree(xauthfile); | |
826 | ||
3c0ef626 | 827 | /* |
828 | * If we didn't get authentication data, just make up some | |
829 | * data. The forwarding code will check the validity of the | |
830 | * response anyway, and substitute this data. The X11 | |
831 | * server, however, will ignore this fake data and use | |
832 | * whatever authentication mechanisms it was using otherwise | |
833 | * for the local connection. | |
834 | */ | |
835 | if (!got_data) { | |
1b56ff3d | 836 | u_int32_t rnd = 0; |
3c0ef626 | 837 | |
416fd2a8 | 838 | logit("Warning: No xauth data; " |
839 | "using fake authentication data for X11 forwarding."); | |
840 | strlcpy(proto, SSH_X11_PROTO, sizeof proto); | |
3c0ef626 | 841 | for (i = 0; i < 16; i++) { |
842 | if (i % 4 == 0) | |
1b56ff3d | 843 | rnd = arc4random(); |
416fd2a8 | 844 | snprintf(data + 2 * i, sizeof data - 2 * i, "%02x", |
1b56ff3d | 845 | rnd & 0xff); |
846 | rnd >>= 8; | |
3c0ef626 | 847 | } |
848 | } | |
849 | } | |
850 | ||
851 | static void | |
852 | ssh_init_forwarding(void) | |
853 | { | |
854 | int success = 0; | |
855 | int i; | |
856 | ||
857 | /* Initiate local TCP/IP port forwardings. */ | |
858 | for (i = 0; i < options.num_local_forwards; i++) { | |
859 | debug("Connections to local port %d forwarded to remote address %.200s:%d", | |
860 | options.local_forwards[i].port, | |
861 | options.local_forwards[i].host, | |
862 | options.local_forwards[i].host_port); | |
e9a17296 | 863 | success += channel_setup_local_fwd_listener( |
3c0ef626 | 864 | options.local_forwards[i].port, |
865 | options.local_forwards[i].host, | |
866 | options.local_forwards[i].host_port, | |
867 | options.gateway_ports); | |
868 | } | |
869 | if (i > 0 && success == 0) | |
870 | error("Could not request local forwarding."); | |
871 | ||
872 | /* Initiate remote TCP/IP port forwardings. */ | |
873 | for (i = 0; i < options.num_remote_forwards; i++) { | |
874 | debug("Connections to remote port %d forwarded to local address %.200s:%d", | |
875 | options.remote_forwards[i].port, | |
876 | options.remote_forwards[i].host, | |
877 | options.remote_forwards[i].host_port); | |
878 | channel_request_remote_forwarding( | |
879 | options.remote_forwards[i].port, | |
880 | options.remote_forwards[i].host, | |
881 | options.remote_forwards[i].host_port); | |
882 | } | |
883 | } | |
884 | ||
885 | static void | |
886 | check_agent_present(void) | |
887 | { | |
888 | if (options.forward_agent) { | |
889 | /* Clear agent forwarding if we don\'t have an agent. */ | |
e54b3d7c | 890 | if (!ssh_agent_present()) |
3c0ef626 | 891 | options.forward_agent = 0; |
3c0ef626 | 892 | } |
893 | } | |
894 | ||
895 | static int | |
896 | ssh_session(void) | |
897 | { | |
898 | int type; | |
3c0ef626 | 899 | int interactive = 0; |
900 | int have_tty = 0; | |
901 | struct winsize ws; | |
902 | char *cp; | |
903 | ||
904 | /* Enable compression if requested. */ | |
905 | if (options.compression) { | |
906 | debug("Requesting compression at level %d.", options.compression_level); | |
907 | ||
908 | if (options.compression_level < 1 || options.compression_level > 9) | |
909 | fatal("Compression level must be from 1 (fast) to 9 (slow, best)."); | |
910 | ||
911 | /* Send the request. */ | |
912 | packet_start(SSH_CMSG_REQUEST_COMPRESSION); | |
913 | packet_put_int(options.compression_level); | |
914 | packet_send(); | |
915 | packet_write_wait(); | |
e9a17296 | 916 | type = packet_read(); |
3c0ef626 | 917 | if (type == SSH_SMSG_SUCCESS) |
918 | packet_start_compression(options.compression_level); | |
919 | else if (type == SSH_SMSG_FAILURE) | |
70791e56 | 920 | logit("Warning: Remote host refused compression."); |
3c0ef626 | 921 | else |
922 | packet_disconnect("Protocol error waiting for compression response."); | |
923 | } | |
924 | /* Allocate a pseudo tty if appropriate. */ | |
925 | if (tty_flag) { | |
926 | debug("Requesting pty."); | |
927 | ||
928 | /* Start the packet. */ | |
929 | packet_start(SSH_CMSG_REQUEST_PTY); | |
930 | ||
931 | /* Store TERM in the packet. There is no limit on the | |
932 | length of the string. */ | |
933 | cp = getenv("TERM"); | |
934 | if (!cp) | |
935 | cp = ""; | |
936 | packet_put_cstring(cp); | |
937 | ||
938 | /* Store window size in the packet. */ | |
939 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) | |
940 | memset(&ws, 0, sizeof(ws)); | |
941 | packet_put_int(ws.ws_row); | |
942 | packet_put_int(ws.ws_col); | |
943 | packet_put_int(ws.ws_xpixel); | |
944 | packet_put_int(ws.ws_ypixel); | |
945 | ||
946 | /* Store tty modes in the packet. */ | |
947 | tty_make_modes(fileno(stdin), NULL); | |
948 | ||
949 | /* Send the packet, and wait for it to leave. */ | |
950 | packet_send(); | |
951 | packet_write_wait(); | |
952 | ||
953 | /* Read response from the server. */ | |
e9a17296 | 954 | type = packet_read(); |
3c0ef626 | 955 | if (type == SSH_SMSG_SUCCESS) { |
956 | interactive = 1; | |
957 | have_tty = 1; | |
958 | } else if (type == SSH_SMSG_FAILURE) | |
70791e56 | 959 | logit("Warning: Remote host failed or refused to allocate a pseudo tty."); |
3c0ef626 | 960 | else |
961 | packet_disconnect("Protocol error waiting for pty request response."); | |
962 | } | |
963 | /* Request X11 forwarding if enabled and DISPLAY is set. */ | |
964 | if (options.forward_x11 && getenv("DISPLAY") != NULL) { | |
e9a17296 | 965 | char *proto, *data; |
3c0ef626 | 966 | /* Get reasonable local authentication information. */ |
e9a17296 | 967 | x11_get_proto(&proto, &data); |
3c0ef626 | 968 | /* Request forwarding with authentication spoofing. */ |
969 | debug("Requesting X11 forwarding with authentication spoofing."); | |
970 | x11_request_forwarding_with_spoofing(0, proto, data); | |
971 | ||
972 | /* Read response from the server. */ | |
e9a17296 | 973 | type = packet_read(); |
3c0ef626 | 974 | if (type == SSH_SMSG_SUCCESS) { |
975 | interactive = 1; | |
976 | } else if (type == SSH_SMSG_FAILURE) { | |
70791e56 | 977 | logit("Warning: Remote host denied X11 forwarding."); |
3c0ef626 | 978 | } else { |
979 | packet_disconnect("Protocol error waiting for X11 forwarding"); | |
980 | } | |
981 | } | |
982 | /* Tell the packet module whether this is an interactive session. */ | |
983 | packet_set_interactive(interactive); | |
984 | ||
985 | /* Request authentication agent forwarding if appropriate. */ | |
986 | check_agent_present(); | |
987 | ||
988 | if (options.forward_agent) { | |
989 | debug("Requesting authentication agent forwarding."); | |
990 | auth_request_forwarding(); | |
991 | ||
992 | /* Read response from the server. */ | |
e9a17296 | 993 | type = packet_read(); |
994 | packet_check_eom(); | |
3c0ef626 | 995 | if (type != SSH_SMSG_SUCCESS) |
70791e56 | 996 | logit("Warning: Remote host denied authentication agent forwarding."); |
3c0ef626 | 997 | } |
998 | ||
999 | /* Initiate port forwardings. */ | |
1000 | ssh_init_forwarding(); | |
1001 | ||
1002 | /* If requested, let ssh continue in the background. */ | |
1003 | if (fork_after_authentication_flag) | |
1004 | if (daemon(1, 1) < 0) | |
1005 | fatal("daemon() failed: %.200s", strerror(errno)); | |
1006 | ||
1007 | /* | |
1008 | * If a command was specified on the command line, execute the | |
1009 | * command now. Otherwise request the server to start a shell. | |
1010 | */ | |
1011 | if (buffer_len(&command) > 0) { | |
1012 | int len = buffer_len(&command); | |
1013 | if (len > 900) | |
1014 | len = 900; | |
e9a17296 | 1015 | debug("Sending command: %.*s", len, (u_char *)buffer_ptr(&command)); |
3c0ef626 | 1016 | packet_start(SSH_CMSG_EXEC_CMD); |
1017 | packet_put_string(buffer_ptr(&command), buffer_len(&command)); | |
1018 | packet_send(); | |
1019 | packet_write_wait(); | |
1020 | } else { | |
1021 | debug("Requesting shell."); | |
1022 | packet_start(SSH_CMSG_EXEC_SHELL); | |
1023 | packet_send(); | |
1024 | packet_write_wait(); | |
1025 | } | |
1026 | ||
1027 | /* Enter the interactive session. */ | |
1028 | return client_loop(have_tty, tty_flag ? | |
1029 | options.escape_char : SSH_ESCAPECHAR_NONE, 0); | |
1030 | } | |
1031 | ||
1032 | static void | |
1b56ff3d | 1033 | ssh_subsystem_reply(int type, u_int32_t seq, void *ctxt) |
3c0ef626 | 1034 | { |
1035 | int id, len; | |
1036 | ||
1037 | id = packet_get_int(); | |
1038 | len = buffer_len(&command); | |
1039 | if (len > 900) | |
1040 | len = 900; | |
e9a17296 | 1041 | packet_check_eom(); |
3c0ef626 | 1042 | if (type == SSH2_MSG_CHANNEL_FAILURE) |
1043 | fatal("Request for subsystem '%.*s' failed on channel %d", | |
e9a17296 | 1044 | len, (u_char *)buffer_ptr(&command), id); |
3c0ef626 | 1045 | } |
1046 | ||
2980ea68 | 1047 | void |
416fd2a8 | 1048 | client_global_request_reply_fwd(int type, u_int32_t seq, void *ctxt) |
2980ea68 | 1049 | { |
1050 | int i; | |
1051 | ||
1052 | i = client_global_request_id++; | |
416fd2a8 | 1053 | if (i >= options.num_remote_forwards) |
2980ea68 | 1054 | return; |
2980ea68 | 1055 | debug("remote forward %s for: listen %d, connect %s:%d", |
1056 | type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure", | |
1057 | options.remote_forwards[i].port, | |
1058 | options.remote_forwards[i].host, | |
1059 | options.remote_forwards[i].host_port); | |
1060 | if (type == SSH2_MSG_REQUEST_FAILURE) | |
70791e56 | 1061 | logit("Warning: remote port forwarding failed for listen port %d", |
2980ea68 | 1062 | options.remote_forwards[i].port); |
1063 | } | |
1064 | ||
3c0ef626 | 1065 | static void |
1b56ff3d | 1066 | ssh_control_listener(void) |
3c0ef626 | 1067 | { |
1b56ff3d | 1068 | struct sockaddr_un addr; |
1069 | mode_t old_umask; | |
1070 | int addr_len; | |
3c0ef626 | 1071 | |
1b56ff3d | 1072 | if (options.control_path == NULL || options.control_master <= 0) |
1073 | return; | |
3c0ef626 | 1074 | |
1b56ff3d | 1075 | memset(&addr, '\0', sizeof(addr)); |
1076 | addr.sun_family = AF_UNIX; | |
1077 | addr_len = offsetof(struct sockaddr_un, sun_path) + | |
1078 | strlen(options.control_path) + 1; | |
3c0ef626 | 1079 | |
1b56ff3d | 1080 | if (strlcpy(addr.sun_path, options.control_path, |
1081 | sizeof(addr.sun_path)) >= sizeof(addr.sun_path)) | |
1082 | fatal("ControlPath too long"); | |
1083 | ||
1084 | if ((control_fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) | |
1085 | fatal("%s socket(): %s\n", __func__, strerror(errno)); | |
1086 | ||
1087 | old_umask = umask(0177); | |
1088 | if (bind(control_fd, (struct sockaddr*)&addr, addr_len) == -1) { | |
1089 | control_fd = -1; | |
1090 | if (errno == EINVAL) | |
1091 | fatal("ControlSocket %s already exists", | |
1092 | options.control_path); | |
1093 | else | |
1094 | fatal("%s bind(): %s\n", __func__, strerror(errno)); | |
3c0ef626 | 1095 | } |
1b56ff3d | 1096 | umask(old_umask); |
1097 | ||
1098 | if (listen(control_fd, 64) == -1) | |
1099 | fatal("%s listen(): %s\n", __func__, strerror(errno)); | |
1100 | ||
1101 | set_nonblock(control_fd); | |
1102 | } | |
1103 | ||
1104 | /* request pty/x11/agent/tcpfwd/shell for channel */ | |
1105 | static void | |
1106 | ssh_session2_setup(int id, void *arg) | |
1107 | { | |
1108 | extern char **environ; | |
1109 | ||
1110 | int interactive = tty_flag; | |
1111 | if (options.forward_x11 && getenv("DISPLAY") != NULL) { | |
e9a17296 | 1112 | char *proto, *data; |
3c0ef626 | 1113 | /* Get reasonable local authentication information. */ |
e9a17296 | 1114 | x11_get_proto(&proto, &data); |
3c0ef626 | 1115 | /* Request forwarding with authentication spoofing. */ |
1116 | debug("Requesting X11 forwarding with authentication spoofing."); | |
1117 | x11_request_forwarding_with_spoofing(id, proto, data); | |
1118 | interactive = 1; | |
1119 | /* XXX wait for reply */ | |
1120 | } | |
1121 | ||
1122 | check_agent_present(); | |
1123 | if (options.forward_agent) { | |
1124 | debug("Requesting authentication agent forwarding."); | |
1125 | channel_request_start(id, "auth-agent-req@openssh.com", 0); | |
1126 | packet_send(); | |
1127 | } | |
1128 | ||
1b56ff3d | 1129 | client_session2_setup(id, tty_flag, subsystem_flag, getenv("TERM"), |
1130 | NULL, fileno(stdin), &command, environ, &ssh_subsystem_reply); | |
3c0ef626 | 1131 | |
3c0ef626 | 1132 | packet_set_interactive(interactive); |
1133 | } | |
1134 | ||
1135 | /* open new channel for a session */ | |
1136 | static int | |
1137 | ssh_session2_open(void) | |
1138 | { | |
1139 | Channel *c; | |
1140 | int window, packetmax, in, out, err; | |
1141 | ||
1142 | if (stdin_null_flag) { | |
1143 | in = open(_PATH_DEVNULL, O_RDONLY); | |
1144 | } else { | |
1145 | in = dup(STDIN_FILENO); | |
1146 | } | |
1147 | out = dup(STDOUT_FILENO); | |
1148 | err = dup(STDERR_FILENO); | |
1149 | ||
1150 | if (in < 0 || out < 0 || err < 0) | |
1151 | fatal("dup() in/out/err failed"); | |
1152 | ||
1153 | /* enable nonblocking unless tty */ | |
1154 | if (!isatty(in)) | |
1155 | set_nonblock(in); | |
1156 | if (!isatty(out)) | |
1157 | set_nonblock(out); | |
1158 | if (!isatty(err)) | |
1159 | set_nonblock(err); | |
1160 | ||
1161 | window = CHAN_SES_WINDOW_DEFAULT; | |
1162 | packetmax = CHAN_SES_PACKET_DEFAULT; | |
e9a17296 | 1163 | if (tty_flag) { |
1164 | window >>= 1; | |
1165 | packetmax >>= 1; | |
3c0ef626 | 1166 | } |
1167 | c = channel_new( | |
1168 | "session", SSH_CHANNEL_OPENING, in, out, err, | |
1169 | window, packetmax, CHAN_EXTENDED_WRITE, | |
70791e56 | 1170 | "client-session", /*nonblock*/0); |
3c0ef626 | 1171 | |
1172 | debug3("ssh_session2_open: channel_new: %d", c->self); | |
1173 | ||
1174 | channel_send_open(c->self); | |
1175 | if (!no_shell_flag) | |
1b56ff3d | 1176 | channel_register_confirm(c->self, ssh_session2_setup, NULL); |
3c0ef626 | 1177 | |
1178 | return c->self; | |
1179 | } | |
1180 | ||
1181 | static int | |
1182 | ssh_session2(void) | |
1183 | { | |
1184 | int id = -1; | |
1185 | ||
1186 | /* XXX should be pre-session */ | |
1187 | ssh_init_forwarding(); | |
1b56ff3d | 1188 | ssh_control_listener(); |
3c0ef626 | 1189 | |
1190 | if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN)) | |
1191 | id = ssh_session2_open(); | |
1192 | ||
1193 | /* If requested, let ssh continue in the background. */ | |
1194 | if (fork_after_authentication_flag) | |
1195 | if (daemon(1, 1) < 0) | |
1196 | fatal("daemon() failed: %.200s", strerror(errno)); | |
1197 | ||
1198 | return client_loop(tty_flag, tty_flag ? | |
1199 | options.escape_char : SSH_ESCAPECHAR_NONE, id); | |
1200 | } | |
1201 | ||
1202 | static void | |
1203 | load_public_identity_files(void) | |
1204 | { | |
1205 | char *filename; | |
3c0ef626 | 1206 | int i = 0; |
2980ea68 | 1207 | Key *public; |
3c0ef626 | 1208 | #ifdef SMARTCARD |
2980ea68 | 1209 | Key **keys; |
1210 | ||
3c0ef626 | 1211 | if (options.smartcard_device != NULL && |
2980ea68 | 1212 | options.num_identity_files < SSH_MAX_IDENTITY_FILES && |
1213 | (keys = sc_get_keys(options.smartcard_device, NULL)) != NULL ) { | |
1214 | int count = 0; | |
1215 | for (i = 0; keys[i] != NULL; i++) { | |
1216 | count++; | |
1217 | memmove(&options.identity_files[1], &options.identity_files[0], | |
1218 | sizeof(char *) * (SSH_MAX_IDENTITY_FILES - 1)); | |
1219 | memmove(&options.identity_keys[1], &options.identity_keys[0], | |
1220 | sizeof(Key *) * (SSH_MAX_IDENTITY_FILES - 1)); | |
1221 | options.num_identity_files++; | |
1222 | options.identity_keys[0] = keys[i]; | |
70791e56 | 1223 | options.identity_files[0] = sc_get_key_label(keys[i]); |
2980ea68 | 1224 | } |
1225 | if (options.num_identity_files > SSH_MAX_IDENTITY_FILES) | |
1226 | options.num_identity_files = SSH_MAX_IDENTITY_FILES; | |
1227 | i = count; | |
1228 | xfree(keys); | |
3c0ef626 | 1229 | } |
1230 | #endif /* SMARTCARD */ | |
1231 | for (; i < options.num_identity_files; i++) { | |
1232 | filename = tilde_expand_filename(options.identity_files[i], | |
1233 | original_real_uid); | |
1234 | public = key_load_public(filename, NULL); | |
1235 | debug("identity file %s type %d", filename, | |
1236 | public ? public->type : -1); | |
1237 | xfree(options.identity_files[i]); | |
1238 | options.identity_files[i] = filename; | |
1239 | options.identity_keys[i] = public; | |
1240 | } | |
1241 | } | |
1b56ff3d | 1242 | |
1243 | static void | |
1244 | control_client_sighandler(int signo) | |
1245 | { | |
1246 | control_client_terminate = signo; | |
1247 | } | |
1248 | ||
1249 | static void | |
1250 | control_client_sigrelay(int signo) | |
1251 | { | |
1252 | if (control_server_pid > 1) | |
1253 | kill(control_server_pid, signo); | |
1254 | } | |
1255 | ||
1256 | static int | |
1257 | env_permitted(char *env) | |
1258 | { | |
1259 | int i; | |
1260 | char name[1024], *cp; | |
1261 | ||
1262 | strlcpy(name, env, sizeof(name)); | |
1263 | if ((cp = strchr(name, '=')) == NULL) | |
1264 | return (0); | |
1265 | ||
1266 | *cp = '\0'; | |
1267 | ||
1268 | for (i = 0; i < options.num_send_env; i++) | |
1269 | if (match_pattern(name, options.send_env[i])) | |
1270 | return (1); | |
1271 | ||
1272 | return (0); | |
1273 | } | |
1274 | ||
1275 | static void | |
1276 | control_client(const char *path) | |
1277 | { | |
1278 | struct sockaddr_un addr; | |
1279 | int i, r, sock, exitval, num_env, addr_len; | |
1280 | Buffer m; | |
1281 | char *cp; | |
1282 | extern char **environ; | |
1283 | ||
1284 | memset(&addr, '\0', sizeof(addr)); | |
1285 | addr.sun_family = AF_UNIX; | |
1286 | addr_len = offsetof(struct sockaddr_un, sun_path) + | |
1287 | strlen(path) + 1; | |
1288 | ||
1289 | if (strlcpy(addr.sun_path, path, | |
1290 | sizeof(addr.sun_path)) >= sizeof(addr.sun_path)) | |
1291 | fatal("ControlPath too long"); | |
1292 | ||
1293 | if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) | |
1294 | fatal("%s socket(): %s", __func__, strerror(errno)); | |
1295 | ||
1296 | if (connect(sock, (struct sockaddr*)&addr, addr_len) == -1) | |
1297 | fatal("Couldn't connect to %s: %s", path, strerror(errno)); | |
1298 | ||
1299 | if ((cp = getenv("TERM")) == NULL) | |
1300 | cp = ""; | |
1301 | ||
1302 | buffer_init(&m); | |
1303 | ||
1304 | /* Get PID of controlee */ | |
1305 | if (ssh_msg_recv(sock, &m) == -1) | |
1306 | fatal("%s: msg_recv", __func__); | |
1307 | if (buffer_get_char(&m) != 0) | |
1308 | fatal("%s: wrong version", __func__); | |
1309 | /* Connection allowed? */ | |
1310 | if (buffer_get_int(&m) != 1) | |
1311 | fatal("Connection to master denied"); | |
1312 | control_server_pid = buffer_get_int(&m); | |
1313 | ||
1314 | buffer_clear(&m); | |
1315 | buffer_put_int(&m, tty_flag); | |
1316 | buffer_put_int(&m, subsystem_flag); | |
1317 | buffer_put_cstring(&m, cp); | |
1318 | ||
1319 | buffer_append(&command, "\0", 1); | |
1320 | buffer_put_cstring(&m, buffer_ptr(&command)); | |
1321 | ||
1322 | if (options.num_send_env == 0 || environ == NULL) { | |
1323 | buffer_put_int(&m, 0); | |
1324 | } else { | |
1325 | /* Pass environment */ | |
1326 | num_env = 0; | |
1327 | for (i = 0; environ[i] != NULL; i++) | |
1328 | if (env_permitted(environ[i])) | |
1329 | num_env++; /* Count */ | |
1330 | ||
1331 | buffer_put_int(&m, num_env); | |
1332 | ||
1333 | for (i = 0; environ[i] != NULL && num_env >= 0; i++) | |
1334 | if (env_permitted(environ[i])) { | |
1335 | num_env--; | |
1336 | buffer_put_cstring(&m, environ[i]); | |
1337 | } | |
1338 | } | |
1339 | ||
1340 | if (ssh_msg_send(sock, /* version */0, &m) == -1) | |
1341 | fatal("%s: msg_send", __func__); | |
1342 | ||
1343 | mm_send_fd(sock, STDIN_FILENO); | |
1344 | mm_send_fd(sock, STDOUT_FILENO); | |
1345 | mm_send_fd(sock, STDERR_FILENO); | |
1346 | ||
1347 | /* Wait for reply, so master has a chance to gather ttymodes */ | |
1348 | buffer_clear(&m); | |
1349 | if (ssh_msg_recv(sock, &m) == -1) | |
1350 | fatal("%s: msg_recv", __func__); | |
1351 | if (buffer_get_char(&m) != 0) | |
1352 | fatal("%s: master returned error", __func__); | |
1353 | buffer_free(&m); | |
1354 | ||
1355 | signal(SIGINT, control_client_sighandler); | |
1356 | signal(SIGTERM, control_client_sighandler); | |
1357 | signal(SIGWINCH, control_client_sigrelay); | |
1358 | ||
1359 | if (tty_flag) | |
1360 | enter_raw_mode(); | |
1361 | ||
1362 | /* Stick around until the controlee closes the client_fd */ | |
1363 | exitval = 0; | |
1364 | for (;!control_client_terminate;) { | |
1365 | r = read(sock, &exitval, sizeof(exitval)); | |
1366 | if (r == 0) { | |
1367 | debug2("Received EOF from master"); | |
1368 | break; | |
1369 | } | |
1370 | if (r > 0) | |
1371 | debug2("Received exit status from master %d", exitval); | |
1372 | if (r == -1 && errno != EINTR) | |
1373 | fatal("%s: read %s", __func__, strerror(errno)); | |
1374 | } | |
1375 | ||
1376 | if (control_client_terminate) | |
1377 | debug2("Exiting on signal %d", control_client_terminate); | |
1378 | ||
1379 | close(sock); | |
1380 | ||
1381 | leave_raw_mode(); | |
1382 | ||
1383 | if (tty_flag && options.log_level != SYSLOG_LEVEL_QUIET) | |
1384 | fprintf(stderr, "Connection to master closed.\r\n"); | |
1385 | ||
1386 | exit(exitval); | |
1387 | } |