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c8dfff33 | 1 | /* $OpenBSD: ssh.c,v 1.286 2006/07/12 22:28:52 stevesk Exp $ */ |
8efc0c15 | 2 | /* |
5260325f | 3 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
4 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
5 | * All rights reserved | |
5260325f | 6 | * Ssh client program. This program can be used to log into a remote machine. |
7 | * The software supports strong authentication, encryption, and forwarding | |
8 | * of X11, TCP/IP, and authentication connections. | |
9 | * | |
bcbf86ec | 10 | * As far as I am concerned, the code I have written for this software |
11 | * can be used freely for any purpose. Any derived versions of this | |
12 | * software must be clearly marked as such, and if the derived work is | |
13 | * incompatible with the protocol description in the RFC file, it must be | |
14 | * called by a name other than "ssh" or "Secure Shell". | |
15 | * | |
16 | * Copyright (c) 1999 Niels Provos. All rights reserved. | |
d73a67d7 | 17 | * Copyright (c) 2000, 2001, 2002, 2003 Markus Friedl. All rights reserved. |
bcbf86ec | 18 | * |
19 | * Modified to work with SSL by Niels Provos <provos@citi.umich.edu> | |
20 | * in Canada (German citizen). | |
21 | * | |
22 | * Redistribution and use in source and binary forms, with or without | |
23 | * modification, are permitted provided that the following conditions | |
24 | * are met: | |
25 | * 1. Redistributions of source code must retain the above copyright | |
26 | * notice, this list of conditions and the following disclaimer. | |
27 | * 2. Redistributions in binary form must reproduce the above copyright | |
28 | * notice, this list of conditions and the following disclaimer in the | |
29 | * documentation and/or other materials provided with the distribution. | |
30 | * | |
31 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
32 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
33 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
34 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
35 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
36 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
37 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
38 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
39 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
40 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
5260325f | 41 | */ |
8efc0c15 | 42 | |
43 | #include "includes.h" | |
876faccd | 44 | |
4095f623 | 45 | #include <sys/types.h> |
46 | #ifdef HAVE_SYS_STAT_H | |
47 | # include <sys/stat.h> | |
48 | #endif | |
876faccd | 49 | #include <sys/resource.h> |
bd7c69ea | 50 | #include <sys/ioctl.h> |
5b04a8bf | 51 | #include <sys/socket.h> |
cebb4c24 | 52 | #include <sys/un.h> |
a75f5360 | 53 | |
b6438382 | 54 | #include <ctype.h> |
dd984467 | 55 | #include <errno.h> |
d3221cca | 56 | #include <fcntl.h> |
c8dfff33 | 57 | #if defined(HAVE_NETDB_H) |
58 | # include <netdb.h> | |
59 | #endif | |
b5b88c19 | 60 | #ifdef HAVE_PATHS_H |
a75f5360 | 61 | #include <paths.h> |
b5b88c19 | 62 | #endif |
b1842393 | 63 | #include <pwd.h> |
ada68823 | 64 | #include <signal.h> |
8efc0c15 | 65 | |
a306f2dd | 66 | #include <openssl/evp.h> |
fa08c86b | 67 | #include <openssl/err.h> |
a306f2dd | 68 | |
8efc0c15 | 69 | #include "ssh.h" |
42f11eb2 | 70 | #include "ssh1.h" |
71 | #include "ssh2.h" | |
72 | #include "compat.h" | |
73 | #include "cipher.h" | |
74 | #include "xmalloc.h" | |
8efc0c15 | 75 | #include "packet.h" |
76 | #include "buffer.h" | |
5e96b616 | 77 | #include "bufaux.h" |
a5efa1bb | 78 | #include "channels.h" |
a306f2dd | 79 | #include "key.h" |
4c8722d9 | 80 | #include "authfd.h" |
a306f2dd | 81 | #include "authfile.h" |
42f11eb2 | 82 | #include "pathnames.h" |
5e96b616 | 83 | #include "dispatch.h" |
b5c334cc | 84 | #include "clientloop.h" |
42f11eb2 | 85 | #include "log.h" |
86 | #include "readconf.h" | |
87 | #include "sshconnect.h" | |
42f11eb2 | 88 | #include "misc.h" |
b2552997 | 89 | #include "kex.h" |
90 | #include "mac.h" | |
07d80252 | 91 | #include "sshpty.h" |
61a2c1da | 92 | #include "match.h" |
5e96b616 | 93 | #include "msg.h" |
94 | #include "monitor_fdpass.h" | |
6213295d | 95 | #include "uidswap.h" |
28015df4 | 96 | #include "version.h" |
8efc0c15 | 97 | |
383546c4 | 98 | #ifdef SMARTCARD |
383546c4 | 99 | #include "scard.h" |
dd2495cb | 100 | #endif |
383546c4 | 101 | |
f601d847 | 102 | extern char *__progname; |
f601d847 | 103 | |
5260325f | 104 | /* Flag indicating whether debug mode is on. This can be set on the command line. */ |
8efc0c15 | 105 | int debug_flag = 0; |
106 | ||
a8be9f80 | 107 | /* Flag indicating whether a tty should be allocated */ |
8efc0c15 | 108 | int tty_flag = 0; |
8abcdba4 | 109 | int no_tty_flag = 0; |
110 | int force_tty_flag = 0; | |
8efc0c15 | 111 | |
8ce64345 | 112 | /* don't exec a shell */ |
113 | int no_shell_flag = 0; | |
8ce64345 | 114 | |
aa3378df | 115 | /* |
116 | * Flag indicating that nothing should be read from stdin. This can be set | |
117 | * on the command line. | |
118 | */ | |
8efc0c15 | 119 | int stdin_null_flag = 0; |
120 | ||
aa3378df | 121 | /* |
122 | * Flag indicating that ssh should fork after authentication. This is useful | |
c242fc96 | 123 | * so that the passphrase can be entered manually, and then ssh goes to the |
aa3378df | 124 | * background. |
125 | */ | |
8efc0c15 | 126 | int fork_after_authentication_flag = 0; |
127 | ||
aa3378df | 128 | /* |
129 | * General data structure for command line options and options configurable | |
130 | * in configuration files. See readconf.h. | |
131 | */ | |
8efc0c15 | 132 | Options options; |
133 | ||
e591b98a | 134 | /* optional user configfile */ |
135 | char *config = NULL; | |
136 | ||
aa3378df | 137 | /* |
138 | * Name of the host we are connecting to. This is the name given on the | |
139 | * command line, or the HostName specified for the user-supplied name in a | |
140 | * configuration file. | |
141 | */ | |
8efc0c15 | 142 | char *host; |
143 | ||
144 | /* socket address the host resolves to */ | |
48e671d5 | 145 | struct sockaddr_storage hostaddr; |
8efc0c15 | 146 | |
8002af61 | 147 | /* Private host keys. */ |
39c00dc2 | 148 | Sensitive sensitive_data; |
8efc0c15 | 149 | |
150 | /* Original real UID. */ | |
151 | uid_t original_real_uid; | |
3fb156df | 152 | uid_t original_effective_uid; |
8efc0c15 | 153 | |
8ce64345 | 154 | /* command to be executed */ |
155 | Buffer command; | |
156 | ||
ae810de7 | 157 | /* Should we execute a command or invoke a subsystem? */ |
158 | int subsystem_flag = 0; | |
159 | ||
e0ae8728 | 160 | /* # of replies received for global requests */ |
161 | static int client_global_request_id = 0; | |
162 | ||
6939bbd4 | 163 | /* pid of proxycommand child process */ |
164 | pid_t proxy_command_pid = 0; | |
165 | ||
5e96b616 | 166 | /* fd to control socket */ |
167 | int control_fd = -1; | |
168 | ||
f8c6db83 | 169 | /* Multiplexing control command */ |
19186c3d | 170 | static u_int mux_command = 0; |
f8c6db83 | 171 | |
5e96b616 | 172 | /* Only used in control client mode */ |
173 | volatile sig_atomic_t control_client_terminate = 0; | |
174 | u_int control_server_pid = 0; | |
175 | ||
8efc0c15 | 176 | /* Prints a help message to the user. This function never returns. */ |
177 | ||
396c147e | 178 | static void |
5ca51e19 | 179 | usage(void) |
8efc0c15 | 180 | { |
182ccbba | 181 | fprintf(stderr, |
aeefce7a | 182 | "usage: ssh [-1246AaCfgkMNnqsTtVvXxY] [-b bind_address] [-c cipher_spec]\n" |
80e29ee6 | 183 | " [-D [bind_address:]port] [-e escape_char] [-F configfile]\n" |
8cf98c65 | 184 | " [-i identity_file] [-L [bind_address:]port:host:hostport]\n" |
3867aa0a | 185 | " [-l login_name] [-m mac_spec] [-O ctl_cmd] [-o option] [-p port]\n" |
8cf98c65 | 186 | " [-R [bind_address:]port:host:hostport] [-S ctl_path]\n" |
06fa4ac1 | 187 | " [-w local_tun[:remote_tun]] [user@]hostname [command]\n" |
182ccbba | 188 | ); |
3aa43b24 | 189 | exit(255); |
8efc0c15 | 190 | } |
191 | ||
396c147e | 192 | static int ssh_session(void); |
193 | static int ssh_session2(void); | |
194 | static void load_public_identity_files(void); | |
5e96b616 | 195 | static void control_client(const char *path); |
8ce64345 | 196 | |
5260325f | 197 | /* |
198 | * Main program for the ssh client. | |
199 | */ | |
8efc0c15 | 200 | int |
201 | main(int ac, char **av) | |
202 | { | |
b34bec32 | 203 | int i, opt, exit_status; |
1aafd17a | 204 | char *p, *cp, *line, buf[256]; |
5260325f | 205 | struct stat st; |
3b1a83df | 206 | struct passwd *pw; |
8ce64345 | 207 | int dummy; |
57dade33 | 208 | extern int optind, optreset; |
1812a662 | 209 | extern char *optarg; |
c1cbe68a | 210 | struct servent *sp; |
3867aa0a | 211 | Forward fwd; |
5260325f | 212 | |
fd6168c1 | 213 | /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ |
214 | sanitise_stdfd(); | |
215 | ||
fda04d7d | 216 | __progname = ssh_get_progname(av[0]); |
264dce47 | 217 | init_rng(); |
218 | ||
aa3378df | 219 | /* |
220 | * Save the original real uid. It will be needed later (uid-swapping | |
221 | * may clobber the real uid). | |
222 | */ | |
5260325f | 223 | original_real_uid = getuid(); |
224 | original_effective_uid = geteuid(); | |
aff51935 | 225 | |
9f324470 | 226 | /* |
227 | * Use uid-swapping to give up root privileges for the duration of | |
228 | * option processing. We will re-instantiate the rights when we are | |
229 | * ready to create the privileged port, and will permanently drop | |
230 | * them when the port has been created (actually, when the connection | |
231 | * has been made, as we may need to create the port several times). | |
232 | */ | |
233 | PRIV_END; | |
5260325f | 234 | |
7322ef0e | 235 | #ifdef HAVE_SETRLIMIT |
5260325f | 236 | /* If we are installed setuid root be careful to not drop core. */ |
237 | if (original_real_uid != original_effective_uid) { | |
238 | struct rlimit rlim; | |
239 | rlim.rlim_cur = rlim.rlim_max = 0; | |
240 | if (setrlimit(RLIMIT_CORE, &rlim) < 0) | |
241 | fatal("setrlimit failed: %.100s", strerror(errno)); | |
8efc0c15 | 242 | } |
3c62e7eb | 243 | #endif |
63bd8c36 | 244 | /* Get user data. */ |
245 | pw = getpwuid(original_real_uid); | |
246 | if (!pw) { | |
bbe88b6d | 247 | logit("You don't exist, go away!"); |
3aa43b24 | 248 | exit(255); |
63bd8c36 | 249 | } |
250 | /* Take a copy of the returned structure. */ | |
251 | pw = pwcopy(pw); | |
252 | ||
aa3378df | 253 | /* |
254 | * Set our umask to something reasonable, as some files are created | |
255 | * with the default umask. This will make them world-readable but | |
256 | * writable only by the owner, which is ok for all files for which we | |
257 | * don't set the modes explicitly. | |
258 | */ | |
5260325f | 259 | umask(022); |
260 | ||
5260325f | 261 | /* Initialize option structure to indicate that no values have been set. */ |
262 | initialize_options(&options); | |
263 | ||
264 | /* Parse command-line arguments. */ | |
265 | host = NULL; | |
266 | ||
16a5525d | 267 | again: |
f5a1a01a | 268 | while ((opt = getopt(ac, av, |
d20f3c9e | 269 | "1246ab:c:e:fgi:kl:m:no:p:qstvxACD:F:I:L:MNO:PR:S:TVw:XY")) != -1) { |
5260325f | 270 | switch (opt) { |
1f3bf5aa | 271 | case '1': |
272 | options.protocol = SSH_PROTO_1; | |
273 | break; | |
6ae2364d | 274 | case '2': |
275 | options.protocol = SSH_PROTO_2; | |
276 | break; | |
48e671d5 | 277 | case '4': |
1572b90f | 278 | options.address_family = AF_INET; |
48e671d5 | 279 | break; |
48e671d5 | 280 | case '6': |
1572b90f | 281 | options.address_family = AF_INET6; |
48e671d5 | 282 | break; |
5260325f | 283 | case 'n': |
284 | stdin_null_flag = 1; | |
285 | break; | |
5260325f | 286 | case 'f': |
287 | fork_after_authentication_flag = 1; | |
288 | stdin_null_flag = 1; | |
289 | break; | |
5260325f | 290 | case 'x': |
291 | options.forward_x11 = 0; | |
292 | break; | |
5260325f | 293 | case 'X': |
294 | options.forward_x11 = 1; | |
295 | break; | |
d73a67d7 | 296 | case 'Y': |
297 | options.forward_x11 = 1; | |
298 | options.forward_x11_trusted = 1; | |
299 | break; | |
5260325f | 300 | case 'g': |
301 | options.gateway_ports = 1; | |
302 | break; | |
f8c6db83 | 303 | case 'O': |
304 | if (strcmp(optarg, "check") == 0) | |
305 | mux_command = SSHMUX_COMMAND_ALIVE_CHECK; | |
306 | else if (strcmp(optarg, "exit") == 0) | |
307 | mux_command = SSHMUX_COMMAND_TERMINATE; | |
308 | else | |
309 | fatal("Invalid multiplex command."); | |
310 | break; | |
e59404d1 | 311 | case 'P': /* deprecated */ |
5260325f | 312 | options.use_privileged_port = 0; |
313 | break; | |
5260325f | 314 | case 'a': |
315 | options.forward_agent = 0; | |
316 | break; | |
71276795 | 317 | case 'A': |
318 | options.forward_agent = 1; | |
319 | break; | |
5260325f | 320 | case 'k': |
f7926e97 | 321 | options.gss_deleg_creds = 0; |
5260325f | 322 | break; |
5260325f | 323 | case 'i': |
324 | if (stat(optarg, &st) < 0) { | |
f5a1a01a | 325 | fprintf(stderr, "Warning: Identity file %s " |
ec304d66 | 326 | "not accessible: %s.\n", optarg, |
327 | strerror(errno)); | |
5260325f | 328 | break; |
329 | } | |
f5a1a01a | 330 | if (options.num_identity_files >= |
331 | SSH_MAX_IDENTITY_FILES) | |
332 | fatal("Too many identity files specified " | |
333 | "(max %d)", SSH_MAX_IDENTITY_FILES); | |
334 | options.identity_files[options.num_identity_files++] = | |
335 | xstrdup(optarg); | |
5260325f | 336 | break; |
383546c4 | 337 | case 'I': |
338 | #ifdef SMARTCARD | |
9ff6f66f | 339 | options.smartcard_device = xstrdup(optarg); |
dd2495cb | 340 | #else |
383546c4 | 341 | fprintf(stderr, "no support for smartcards.\n"); |
dd2495cb | 342 | #endif |
383546c4 | 343 | break; |
5260325f | 344 | case 't': |
8abcdba4 | 345 | if (tty_flag) |
346 | force_tty_flag = 1; | |
5260325f | 347 | tty_flag = 1; |
348 | break; | |
5260325f | 349 | case 'v': |
e053cd2c | 350 | if (debug_flag == 0) { |
bcbf86ec | 351 | debug_flag = 1; |
352 | options.log_level = SYSLOG_LEVEL_DEBUG1; | |
e053cd2c | 353 | } else { |
354 | if (options.log_level < SYSLOG_LEVEL_DEBUG3) | |
355 | options.log_level++; | |
bcbf86ec | 356 | break; |
e053cd2c | 357 | } |
59d4718a | 358 | /* FALLTHROUGH */ |
5260325f | 359 | case 'V': |
85ac7a84 | 360 | fprintf(stderr, "%s, %s\n", |
4526e8c2 | 361 | SSH_RELEASE, SSLeay_version(SSLEAY_VERSION)); |
5260325f | 362 | if (opt == 'V') |
363 | exit(0); | |
5260325f | 364 | break; |
d20f3c9e | 365 | case 'w': |
a4f24bf8 | 366 | if (options.tun_open == -1) |
367 | options.tun_open = SSH_TUNMODE_DEFAULT; | |
d20f3c9e | 368 | options.tun_local = a2tun(optarg, &options.tun_remote); |
a4f24bf8 | 369 | if (options.tun_local == SSH_TUNID_ERR) { |
d20f3c9e | 370 | fprintf(stderr, "Bad tun device '%s'\n", optarg); |
3aa43b24 | 371 | exit(255); |
d20f3c9e | 372 | } |
373 | break; | |
5260325f | 374 | case 'q': |
375 | options.log_level = SYSLOG_LEVEL_QUIET; | |
376 | break; | |
5260325f | 377 | case 'e': |
378 | if (optarg[0] == '^' && optarg[2] == 0 && | |
f5a1a01a | 379 | (u_char) optarg[1] >= 64 && |
380 | (u_char) optarg[1] < 128) | |
1e3b8b07 | 381 | options.escape_char = (u_char) optarg[1] & 31; |
5260325f | 382 | else if (strlen(optarg) == 1) |
1e3b8b07 | 383 | options.escape_char = (u_char) optarg[0]; |
5260325f | 384 | else if (strcmp(optarg, "none") == 0) |
4bf9c10e | 385 | options.escape_char = SSH_ESCAPECHAR_NONE; |
5260325f | 386 | else { |
f5a1a01a | 387 | fprintf(stderr, "Bad escape character '%s'.\n", |
388 | optarg); | |
3aa43b24 | 389 | exit(255); |
5260325f | 390 | } |
391 | break; | |
5260325f | 392 | case 'c': |
a306f2dd | 393 | if (ciphers_valid(optarg)) { |
394 | /* SSH2 only */ | |
395 | options.ciphers = xstrdup(optarg); | |
d77347cc | 396 | options.cipher = SSH_CIPHER_INVALID; |
a306f2dd | 397 | } else { |
398 | /* SSH1 only */ | |
c523303b | 399 | options.cipher = cipher_number(optarg); |
400 | if (options.cipher == -1) { | |
f5a1a01a | 401 | fprintf(stderr, |
402 | "Unknown cipher type '%s'\n", | |
403 | optarg); | |
3aa43b24 | 404 | exit(255); |
a306f2dd | 405 | } |
f5a1a01a | 406 | if (options.cipher == SSH_CIPHER_3DES) |
c523303b | 407 | options.ciphers = "3des-cbc"; |
f5a1a01a | 408 | else if (options.cipher == SSH_CIPHER_BLOWFISH) |
c523303b | 409 | options.ciphers = "blowfish-cbc"; |
f5a1a01a | 410 | else |
c523303b | 411 | options.ciphers = (char *)-1; |
5260325f | 412 | } |
413 | break; | |
b2552997 | 414 | case 'm': |
415 | if (mac_valid(optarg)) | |
416 | options.macs = xstrdup(optarg); | |
417 | else { | |
f5a1a01a | 418 | fprintf(stderr, "Unknown mac type '%s'\n", |
419 | optarg); | |
3aa43b24 | 420 | exit(255); |
b2552997 | 421 | } |
422 | break; | |
5e96b616 | 423 | case 'M': |
9dfd96d6 | 424 | if (options.control_master == SSHCTL_MASTER_YES) |
425 | options.control_master = SSHCTL_MASTER_ASK; | |
426 | else | |
427 | options.control_master = SSHCTL_MASTER_YES; | |
5e96b616 | 428 | break; |
5260325f | 429 | case 'p': |
2d2a2c65 | 430 | options.port = a2port(optarg); |
431 | if (options.port == 0) { | |
6031af8d | 432 | fprintf(stderr, "Bad port '%s'\n", optarg); |
3aa43b24 | 433 | exit(255); |
6031af8d | 434 | } |
5260325f | 435 | break; |
5260325f | 436 | case 'l': |
437 | options.user = optarg; | |
438 | break; | |
d2e3df16 | 439 | |
440 | case 'L': | |
3867aa0a | 441 | if (parse_forward(&fwd, optarg)) |
442 | add_local_forward(&options, &fwd); | |
443 | else { | |
f5a1a01a | 444 | fprintf(stderr, |
3867aa0a | 445 | "Bad local forwarding specification '%s'\n", |
f5a1a01a | 446 | optarg); |
3aa43b24 | 447 | exit(255); |
5260325f | 448 | } |
3867aa0a | 449 | break; |
450 | ||
451 | case 'R': | |
452 | if (parse_forward(&fwd, optarg)) { | |
453 | add_remote_forward(&options, &fwd); | |
454 | } else { | |
f5a1a01a | 455 | fprintf(stderr, |
3867aa0a | 456 | "Bad remote forwarding specification " |
457 | "'%s'\n", optarg); | |
3aa43b24 | 458 | exit(255); |
5260325f | 459 | } |
5260325f | 460 | break; |
0490e609 | 461 | |
462 | case 'D': | |
3867aa0a | 463 | cp = p = xstrdup(optarg); |
464 | memset(&fwd, '\0', sizeof(fwd)); | |
465 | fwd.connect_host = "socks"; | |
466 | if ((fwd.listen_host = hpdelim(&cp)) == NULL) { | |
467 | fprintf(stderr, "Bad dynamic forwarding " | |
468 | "specification '%.100s'\n", optarg); | |
3aa43b24 | 469 | exit(255); |
3867aa0a | 470 | } |
471 | if (cp != NULL) { | |
472 | fwd.listen_port = a2port(cp); | |
473 | fwd.listen_host = cleanhostname(fwd.listen_host); | |
474 | } else { | |
475 | fwd.listen_port = a2port(fwd.listen_host); | |
7c840747 | 476 | fwd.listen_host = NULL; |
3867aa0a | 477 | } |
478 | ||
479 | if (fwd.listen_port == 0) { | |
f5a1a01a | 480 | fprintf(stderr, "Bad dynamic port '%s'\n", |
481 | optarg); | |
3aa43b24 | 482 | exit(255); |
6031af8d | 483 | } |
3867aa0a | 484 | add_local_forward(&options, &fwd); |
485 | xfree(p); | |
0490e609 | 486 | break; |
487 | ||
5260325f | 488 | case 'C': |
489 | options.compression = 1; | |
490 | break; | |
8ce64345 | 491 | case 'N': |
492 | no_shell_flag = 1; | |
493 | no_tty_flag = 1; | |
494 | break; | |
8ce64345 | 495 | case 'T': |
496 | no_tty_flag = 1; | |
497 | break; | |
5260325f | 498 | case 'o': |
499 | dummy = 1; | |
1aafd17a | 500 | line = xstrdup(optarg); |
f5a1a01a | 501 | if (process_config_line(&options, host ? host : "", |
1aafd17a | 502 | line, "command-line", 0, &dummy) != 0) |
3aa43b24 | 503 | exit(255); |
1aafd17a | 504 | xfree(line); |
5260325f | 505 | break; |
ae810de7 | 506 | case 's': |
507 | subsystem_flag = 1; | |
508 | break; | |
5e96b616 | 509 | case 'S': |
510 | if (options.control_path != NULL) | |
511 | free(options.control_path); | |
512 | options.control_path = xstrdup(optarg); | |
5e96b616 | 513 | break; |
3435f5a6 | 514 | case 'b': |
515 | options.bind_address = optarg; | |
516 | break; | |
e591b98a | 517 | case 'F': |
518 | config = optarg; | |
519 | break; | |
5260325f | 520 | default: |
521 | usage(); | |
522 | } | |
523 | } | |
524 | ||
f5a1a01a | 525 | ac -= optind; |
526 | av += optind; | |
527 | ||
528 | if (ac > 0 && !host && **av != '-') { | |
15748b4d | 529 | if (strrchr(*av, '@')) { |
f5a1a01a | 530 | p = xstrdup(*av); |
15748b4d | 531 | cp = strrchr(p, '@'); |
f5a1a01a | 532 | if (cp == NULL || cp == p) |
533 | usage(); | |
534 | options.user = p; | |
535 | *cp = '\0'; | |
536 | host = ++cp; | |
537 | } else | |
538 | host = *av; | |
978ebf99 | 539 | if (ac > 1) { |
540 | optind = optreset = 1; | |
f5a1a01a | 541 | goto again; |
542 | } | |
978ebf99 | 543 | ac--, av++; |
f5a1a01a | 544 | } |
545 | ||
5260325f | 546 | /* Check that we got a host name. */ |
547 | if (!host) | |
8efc0c15 | 548 | usage(); |
5260325f | 549 | |
22d89d24 | 550 | SSLeay_add_all_algorithms(); |
fa08c86b | 551 | ERR_load_crypto_strings(); |
22d89d24 | 552 | |
5260325f | 553 | /* Initialize the command to execute on remote host. */ |
554 | buffer_init(&command); | |
555 | ||
aa3378df | 556 | /* |
557 | * Save the command to execute on the remote host in a buffer. There | |
558 | * is no limit on the length of the command, except by the maximum | |
559 | * packet size. Also sets the tty flag if there is no command. | |
560 | */ | |
f5a1a01a | 561 | if (!ac) { |
5260325f | 562 | /* No command specified - execute shell on a tty. */ |
563 | tty_flag = 1; | |
ae810de7 | 564 | if (subsystem_flag) { |
f5a1a01a | 565 | fprintf(stderr, |
566 | "You must specify a subsystem to invoke.\n"); | |
ae810de7 | 567 | usage(); |
568 | } | |
5260325f | 569 | } else { |
f5a1a01a | 570 | /* A command has been specified. Store it into the buffer. */ |
571 | for (i = 0; i < ac; i++) { | |
572 | if (i) | |
5260325f | 573 | buffer_append(&command, " ", 1); |
574 | buffer_append(&command, av[i], strlen(av[i])); | |
575 | } | |
8efc0c15 | 576 | } |
5260325f | 577 | |
578 | /* Cannot fork to background if no command. */ | |
14a9a859 | 579 | if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag) |
5260325f | 580 | fatal("Cannot fork into background without a command to execute."); |
581 | ||
582 | /* Allocate a tty by default if no command specified. */ | |
583 | if (buffer_len(&command) == 0) | |
584 | tty_flag = 1; | |
585 | ||
343288b8 | 586 | /* Force no tty */ |
0b6fbf03 | 587 | if (no_tty_flag) |
588 | tty_flag = 0; | |
5260325f | 589 | /* Do not allocate a tty if stdin is not a tty. */ |
7697ac2b | 590 | if ((!isatty(fileno(stdin)) || stdin_null_flag) && !force_tty_flag) { |
5260325f | 591 | if (tty_flag) |
bbe88b6d | 592 | logit("Pseudo-terminal will not be allocated because stdin is not a terminal."); |
5260325f | 593 | tty_flag = 0; |
594 | } | |
8ce64345 | 595 | |
20244695 | 596 | /* |
597 | * Initialize "log" output. Since we are the client all output | |
598 | * actually goes to stderr. | |
599 | */ | |
cc44f691 | 600 | log_init(av[0], options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level, |
601 | SYSLOG_FACILITY_USER, 1); | |
5260325f | 602 | |
e591b98a | 603 | /* |
604 | * Read per-user configuration file. Ignore the system wide config | |
605 | * file if the user specifies a config file on the command line. | |
606 | */ | |
607 | if (config != NULL) { | |
f7f14143 | 608 | if (!read_config_file(config, host, &options, 0)) |
93111dfa | 609 | fatal("Can't open user config file %.100s: " |
610 | "%.100s", config, strerror(errno)); | |
e591b98a | 611 | } else { |
612 | snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, | |
613 | _PATH_SSH_USER_CONFFILE); | |
9f6cab4b | 614 | (void)read_config_file(buf, host, &options, 1); |
e591b98a | 615 | |
f67792f2 | 616 | /* Read systemwide configuration file after use config. */ |
f2107e97 | 617 | (void)read_config_file(_PATH_HOST_CONFIG_FILE, host, |
9f6cab4b | 618 | &options, 0); |
e591b98a | 619 | } |
5260325f | 620 | |
621 | /* Fill configuration defaults. */ | |
622 | fill_default_options(&options); | |
623 | ||
1572b90f | 624 | channel_set_af(options.address_family); |
625 | ||
5260325f | 626 | /* reinit */ |
20244695 | 627 | log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 1); |
5260325f | 628 | |
e339aa53 | 629 | seed_rng(); |
630 | ||
5260325f | 631 | if (options.user == NULL) |
632 | options.user = xstrdup(pw->pw_name); | |
633 | ||
634 | if (options.hostname != NULL) | |
635 | host = options.hostname; | |
636 | ||
03c82656 | 637 | /* force lowercase for hostkey matching */ |
638 | if (options.host_key_alias != NULL) { | |
639 | for (p = options.host_key_alias; *p; p++) | |
640 | if (isupper(*p)) | |
9555d258 | 641 | *p = (char)tolower(*p); |
03c82656 | 642 | } |
643 | ||
de574442 | 644 | /* Get default port if port has not been set. */ |
645 | if (options.port == 0) { | |
646 | sp = getservbyname(SSH_SERVICE_NAME, "tcp"); | |
647 | options.port = sp ? ntohs(sp->s_port) : SSH_DEFAULT_PORT; | |
648 | } | |
649 | ||
f78bde70 | 650 | if (options.proxy_command != NULL && |
651 | strcmp(options.proxy_command, "none") == 0) | |
652 | options.proxy_command = NULL; | |
699255b5 | 653 | if (options.control_path != NULL && |
654 | strcmp(options.control_path, "none") == 0) | |
655 | options.control_path = NULL; | |
f78bde70 | 656 | |
5e96b616 | 657 | if (options.control_path != NULL) { |
8cffe22a | 658 | char thishost[NI_MAXHOST]; |
f7b8224d | 659 | |
8cffe22a | 660 | if (gethostname(thishost, sizeof(thishost)) == -1) |
f7b8224d | 661 | fatal("gethostname: %s", strerror(errno)); |
a980cbd7 | 662 | snprintf(buf, sizeof(buf), "%d", options.port); |
663 | cp = tilde_expand_filename(options.control_path, | |
664 | original_real_uid); | |
665 | options.control_path = percent_expand(cp, "p", buf, "h", host, | |
8cffe22a | 666 | "r", options.user, "l", thishost, (char *)NULL); |
a980cbd7 | 667 | xfree(cp); |
5e96b616 | 668 | } |
19186c3d | 669 | if (mux_command != 0 && options.control_path == NULL) |
670 | fatal("No ControlPath specified for \"-O\" command"); | |
9dfd96d6 | 671 | if (options.control_path != NULL) |
cc8ca1e6 | 672 | control_client(options.control_path); |
5e96b616 | 673 | |
6ffc9c88 | 674 | /* Open a connection to the remote host. */ |
1572b90f | 675 | if (ssh_connect(host, &hostaddr, options.port, |
676 | options.address_family, options.connection_attempts, | |
d514c907 | 677 | #ifdef HAVE_CYGWIN |
678 | options.use_privileged_port, | |
679 | #else | |
3fb156df | 680 | original_effective_uid == 0 && options.use_privileged_port, |
d514c907 | 681 | #endif |
de60473e | 682 | options.proxy_command) != 0) |
3aa43b24 | 683 | exit(255); |
5260325f | 684 | |
aa3378df | 685 | /* |
686 | * If we successfully made the connection, load the host private key | |
687 | * in case we will need it later for combined rsa-rhosts | |
688 | * authentication. This must be done before releasing extra | |
689 | * privileges, because the file is only readable by root. | |
78660ed4 | 690 | * If we cannot access the private keys, load the public keys |
691 | * instead and try to execute the ssh-keysign helper instead. | |
aa3378df | 692 | */ |
8002af61 | 693 | sensitive_data.nkeys = 0; |
694 | sensitive_data.keys = NULL; | |
39c00dc2 | 695 | sensitive_data.external_keysign = 0; |
b34bec32 | 696 | if (options.rhosts_rsa_authentication || |
697 | options.hostbased_authentication) { | |
8002af61 | 698 | sensitive_data.nkeys = 3; |
19e79961 | 699 | sensitive_data.keys = xcalloc(sensitive_data.nkeys, |
343288b8 | 700 | sizeof(Key)); |
3fb156df | 701 | |
702 | PRIV_START; | |
8002af61 | 703 | sensitive_data.keys[0] = key_load_private_type(KEY_RSA1, |
fc231518 | 704 | _PATH_HOST_KEY_FILE, "", NULL, NULL); |
8002af61 | 705 | sensitive_data.keys[1] = key_load_private_type(KEY_DSA, |
fc231518 | 706 | _PATH_HOST_DSA_KEY_FILE, "", NULL, NULL); |
8002af61 | 707 | sensitive_data.keys[2] = key_load_private_type(KEY_RSA, |
fc231518 | 708 | _PATH_HOST_RSA_KEY_FILE, "", NULL, NULL); |
3fb156df | 709 | PRIV_END; |
39c00dc2 | 710 | |
60cd0a97 | 711 | if (options.hostbased_authentication == 1 && |
712 | sensitive_data.keys[0] == NULL && | |
39c00dc2 | 713 | sensitive_data.keys[1] == NULL && |
714 | sensitive_data.keys[2] == NULL) { | |
715 | sensitive_data.keys[1] = key_load_public( | |
716 | _PATH_HOST_DSA_KEY_FILE, NULL); | |
717 | sensitive_data.keys[2] = key_load_public( | |
718 | _PATH_HOST_RSA_KEY_FILE, NULL); | |
719 | sensitive_data.external_keysign = 1; | |
720 | } | |
5260325f | 721 | } |
aa3378df | 722 | /* |
723 | * Get rid of any extra privileges that we may have. We will no | |
724 | * longer need them. Also, extra privileges could make it very hard | |
725 | * to read identity files and other non-world-readable files from the | |
726 | * user's home directory if it happens to be on a NFS volume where | |
727 | * root is mapped to nobody. | |
728 | */ | |
6213295d | 729 | if (original_effective_uid == 0) { |
730 | PRIV_START; | |
731 | permanently_set_uid(pw); | |
732 | } | |
5260325f | 733 | |
aa3378df | 734 | /* |
735 | * Now that we are back to our own permissions, create ~/.ssh | |
7b9b0103 | 736 | * directory if it doesn't already exist. |
aa3378df | 737 | */ |
c3abff07 | 738 | snprintf(buf, sizeof buf, "%.100s%s%.100s", pw->pw_dir, strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR); |
5260325f | 739 | if (stat(buf, &st) < 0) |
704b1659 | 740 | if (mkdir(buf, 0700) < 0) |
5260325f | 741 | error("Could not create directory '%.200s'.", buf); |
742 | ||
fee56204 | 743 | /* load options.identity_files */ |
744 | load_public_identity_files(); | |
745 | ||
746 | /* Expand ~ in known host file names. */ | |
747 | /* XXX mem-leaks: */ | |
fa08c86b | 748 | options.system_hostfile = |
749 | tilde_expand_filename(options.system_hostfile, original_real_uid); | |
750 | options.user_hostfile = | |
751 | tilde_expand_filename(options.user_hostfile, original_real_uid); | |
752 | options.system_hostfile2 = | |
753 | tilde_expand_filename(options.system_hostfile2, original_real_uid); | |
754 | options.user_hostfile2 = | |
755 | tilde_expand_filename(options.user_hostfile2, original_real_uid); | |
5260325f | 756 | |
67b75437 | 757 | signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */ |
758 | ||
5260325f | 759 | /* Log into the remote system. This never returns if the login fails. */ |
39c00dc2 | 760 | ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr, pw); |
8002af61 | 761 | |
762 | /* We no longer need the private host keys. Clear them now. */ | |
763 | if (sensitive_data.nkeys != 0) { | |
764 | for (i = 0; i < sensitive_data.nkeys; i++) { | |
765 | if (sensitive_data.keys[i] != NULL) { | |
766 | /* Destroys contents safely */ | |
767 | debug3("clear hostkey %d", i); | |
768 | key_free(sensitive_data.keys[i]); | |
769 | sensitive_data.keys[i] = NULL; | |
770 | } | |
771 | } | |
772 | xfree(sensitive_data.keys); | |
773 | } | |
05b7537a | 774 | for (i = 0; i < options.num_identity_files; i++) { |
775 | if (options.identity_files[i]) { | |
776 | xfree(options.identity_files[i]); | |
777 | options.identity_files[i] = NULL; | |
778 | } | |
779 | if (options.identity_keys[i]) { | |
780 | key_free(options.identity_keys[i]); | |
781 | options.identity_keys[i] = NULL; | |
782 | } | |
783 | } | |
5260325f | 784 | |
8ce64345 | 785 | exit_status = compat20 ? ssh_session2() : ssh_session(); |
786 | packet_close(); | |
6939bbd4 | 787 | |
5e96b616 | 788 | if (options.control_path != NULL && control_fd != -1) |
789 | unlink(options.control_path); | |
790 | ||
6939bbd4 | 791 | /* |
aff51935 | 792 | * Send SIGHUP to proxy command if used. We don't wait() in |
6939bbd4 | 793 | * case it hangs and instead rely on init to reap the child |
794 | */ | |
795 | if (proxy_command_pid > 1) | |
796 | kill(proxy_command_pid, SIGHUP); | |
797 | ||
8ce64345 | 798 | return exit_status; |
799 | } | |
800 | ||
396c147e | 801 | static void |
fa08c86b | 802 | ssh_init_forwarding(void) |
803 | { | |
02a024dd | 804 | int success = 0; |
fa08c86b | 805 | int i; |
02a024dd | 806 | |
fa08c86b | 807 | /* Initiate local TCP/IP port forwardings. */ |
808 | for (i = 0; i < options.num_local_forwards; i++) { | |
3867aa0a | 809 | debug("Local connections to %.200s:%d forwarded to remote " |
810 | "address %.200s:%d", | |
f8cc7664 | 811 | (options.local_forwards[i].listen_host == NULL) ? |
812 | (options.gateway_ports ? "*" : "LOCALHOST") : | |
3867aa0a | 813 | options.local_forwards[i].listen_host, |
814 | options.local_forwards[i].listen_port, | |
815 | options.local_forwards[i].connect_host, | |
816 | options.local_forwards[i].connect_port); | |
5641aefa | 817 | success += channel_setup_local_fwd_listener( |
3867aa0a | 818 | options.local_forwards[i].listen_host, |
819 | options.local_forwards[i].listen_port, | |
820 | options.local_forwards[i].connect_host, | |
821 | options.local_forwards[i].connect_port, | |
fa08c86b | 822 | options.gateway_ports); |
823 | } | |
42ea6f5e | 824 | if (i > 0 && success != i && options.exit_on_forward_failure) |
825 | fatal("Could not request local forwarding."); | |
02a024dd | 826 | if (i > 0 && success == 0) |
827 | error("Could not request local forwarding."); | |
fa08c86b | 828 | |
829 | /* Initiate remote TCP/IP port forwardings. */ | |
830 | for (i = 0; i < options.num_remote_forwards; i++) { | |
3867aa0a | 831 | debug("Remote connections from %.200s:%d forwarded to " |
832 | "local address %.200s:%d", | |
56964485 | 833 | (options.remote_forwards[i].listen_host == NULL) ? |
aa9bc1de | 834 | "LOCALHOST" : options.remote_forwards[i].listen_host, |
3867aa0a | 835 | options.remote_forwards[i].listen_port, |
836 | options.remote_forwards[i].connect_host, | |
837 | options.remote_forwards[i].connect_port); | |
42ea6f5e | 838 | if (channel_request_remote_forwarding( |
3867aa0a | 839 | options.remote_forwards[i].listen_host, |
840 | options.remote_forwards[i].listen_port, | |
841 | options.remote_forwards[i].connect_host, | |
42ea6f5e | 842 | options.remote_forwards[i].connect_port) < 0) { |
843 | if (options.exit_on_forward_failure) | |
844 | fatal("Could not request remote forwarding."); | |
845 | else | |
846 | logit("Warning: Could not request remote " | |
847 | "forwarding."); | |
848 | } | |
fa08c86b | 849 | } |
850 | } | |
851 | ||
396c147e | 852 | static void |
fa08c86b | 853 | check_agent_present(void) |
854 | { | |
855 | if (options.forward_agent) { | |
7b9b0103 | 856 | /* Clear agent forwarding if we don't have an agent. */ |
8b10e20e | 857 | if (!ssh_agent_present()) |
fa08c86b | 858 | options.forward_agent = 0; |
fa08c86b | 859 | } |
860 | } | |
861 | ||
396c147e | 862 | static int |
8ce64345 | 863 | ssh_session(void) |
864 | { | |
865 | int type; | |
8ce64345 | 866 | int interactive = 0; |
867 | int have_tty = 0; | |
868 | struct winsize ws; | |
8ce64345 | 869 | char *cp; |
9bf083eb | 870 | const char *display; |
8ce64345 | 871 | |
5260325f | 872 | /* Enable compression if requested. */ |
873 | if (options.compression) { | |
874 | debug("Requesting compression at level %d.", options.compression_level); | |
875 | ||
876 | if (options.compression_level < 1 || options.compression_level > 9) | |
877 | fatal("Compression level must be from 1 (fast) to 9 (slow, best)."); | |
878 | ||
879 | /* Send the request. */ | |
880 | packet_start(SSH_CMSG_REQUEST_COMPRESSION); | |
881 | packet_put_int(options.compression_level); | |
882 | packet_send(); | |
883 | packet_write_wait(); | |
54a5250f | 884 | type = packet_read(); |
5260325f | 885 | if (type == SSH_SMSG_SUCCESS) |
886 | packet_start_compression(options.compression_level); | |
887 | else if (type == SSH_SMSG_FAILURE) | |
bbe88b6d | 888 | logit("Warning: Remote host refused compression."); |
5260325f | 889 | else |
890 | packet_disconnect("Protocol error waiting for compression response."); | |
891 | } | |
892 | /* Allocate a pseudo tty if appropriate. */ | |
893 | if (tty_flag) { | |
894 | debug("Requesting pty."); | |
895 | ||
896 | /* Start the packet. */ | |
897 | packet_start(SSH_CMSG_REQUEST_PTY); | |
898 | ||
899 | /* Store TERM in the packet. There is no limit on the | |
900 | length of the string. */ | |
901 | cp = getenv("TERM"); | |
902 | if (!cp) | |
903 | cp = ""; | |
449c5ba5 | 904 | packet_put_cstring(cp); |
5260325f | 905 | |
906 | /* Store window size in the packet. */ | |
907 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) | |
908 | memset(&ws, 0, sizeof(ws)); | |
148de80c | 909 | packet_put_int((u_int)ws.ws_row); |
910 | packet_put_int((u_int)ws.ws_col); | |
911 | packet_put_int((u_int)ws.ws_xpixel); | |
912 | packet_put_int((u_int)ws.ws_ypixel); | |
5260325f | 913 | |
914 | /* Store tty modes in the packet. */ | |
30dcc918 | 915 | tty_make_modes(fileno(stdin), NULL); |
5260325f | 916 | |
917 | /* Send the packet, and wait for it to leave. */ | |
918 | packet_send(); | |
919 | packet_write_wait(); | |
920 | ||
921 | /* Read response from the server. */ | |
54a5250f | 922 | type = packet_read(); |
4fe2af09 | 923 | if (type == SSH_SMSG_SUCCESS) { |
5260325f | 924 | interactive = 1; |
8ce64345 | 925 | have_tty = 1; |
4fe2af09 | 926 | } else if (type == SSH_SMSG_FAILURE) |
bbe88b6d | 927 | logit("Warning: Remote host failed or refused to allocate a pseudo tty."); |
5260325f | 928 | else |
929 | packet_disconnect("Protocol error waiting for pty request response."); | |
930 | } | |
931 | /* Request X11 forwarding if enabled and DISPLAY is set. */ | |
9bf083eb | 932 | display = getenv("DISPLAY"); |
933 | if (options.forward_x11 && display != NULL) { | |
b48eeb07 | 934 | char *proto, *data; |
0b242b12 | 935 | /* Get reasonable local authentication information. */ |
9bf083eb | 936 | client_x11_get_proto(display, options.xauth_location, |
937 | options.forward_x11_trusted, &proto, &data); | |
0b242b12 | 938 | /* Request forwarding with authentication spoofing. */ |
5260325f | 939 | debug("Requesting X11 forwarding with authentication spoofing."); |
9bf083eb | 940 | x11_request_forwarding_with_spoofing(0, display, proto, data); |
5260325f | 941 | |
942 | /* Read response from the server. */ | |
54a5250f | 943 | type = packet_read(); |
5260325f | 944 | if (type == SSH_SMSG_SUCCESS) { |
5260325f | 945 | interactive = 1; |
0b242b12 | 946 | } else if (type == SSH_SMSG_FAILURE) { |
bbe88b6d | 947 | logit("Warning: Remote host denied X11 forwarding."); |
0b242b12 | 948 | } else { |
5260325f | 949 | packet_disconnect("Protocol error waiting for X11 forwarding"); |
0b242b12 | 950 | } |
5260325f | 951 | } |
952 | /* Tell the packet module whether this is an interactive session. */ | |
b5c334cc | 953 | packet_set_interactive(interactive); |
5260325f | 954 | |
955 | /* Request authentication agent forwarding if appropriate. */ | |
fa08c86b | 956 | check_agent_present(); |
957 | ||
5260325f | 958 | if (options.forward_agent) { |
959 | debug("Requesting authentication agent forwarding."); | |
960 | auth_request_forwarding(); | |
961 | ||
962 | /* Read response from the server. */ | |
54a5250f | 963 | type = packet_read(); |
95500969 | 964 | packet_check_eom(); |
5260325f | 965 | if (type != SSH_SMSG_SUCCESS) |
bbe88b6d | 966 | logit("Warning: Remote host denied authentication agent forwarding."); |
5260325f | 967 | } |
8efc0c15 | 968 | |
fa08c86b | 969 | /* Initiate port forwardings. */ |
970 | ssh_init_forwarding(); | |
5260325f | 971 | |
aa3378df | 972 | /* If requested, let ssh continue in the background. */ |
6ae2364d | 973 | if (fork_after_authentication_flag) |
aa3378df | 974 | if (daemon(1, 1) < 0) |
975 | fatal("daemon() failed: %.200s", strerror(errno)); | |
976 | ||
977 | /* | |
978 | * If a command was specified on the command line, execute the | |
979 | * command now. Otherwise request the server to start a shell. | |
980 | */ | |
5260325f | 981 | if (buffer_len(&command) > 0) { |
982 | int len = buffer_len(&command); | |
983 | if (len > 900) | |
984 | len = 900; | |
6c0fa2b1 | 985 | debug("Sending command: %.*s", len, (u_char *)buffer_ptr(&command)); |
5260325f | 986 | packet_start(SSH_CMSG_EXEC_CMD); |
987 | packet_put_string(buffer_ptr(&command), buffer_len(&command)); | |
988 | packet_send(); | |
989 | packet_write_wait(); | |
990 | } else { | |
991 | debug("Requesting shell."); | |
992 | packet_start(SSH_CMSG_EXEC_SHELL); | |
993 | packet_send(); | |
994 | packet_write_wait(); | |
995 | } | |
996 | ||
997 | /* Enter the interactive session. */ | |
4bf9c10e | 998 | return client_loop(have_tty, tty_flag ? |
999 | options.escape_char : SSH_ESCAPECHAR_NONE, 0); | |
8ce64345 | 1000 | } |
5260325f | 1001 | |
396c147e | 1002 | static void |
5e96b616 | 1003 | ssh_subsystem_reply(int type, u_int32_t seq, void *ctxt) |
1f3bf5aa | 1004 | { |
1005 | int id, len; | |
1006 | ||
1007 | id = packet_get_int(); | |
1008 | len = buffer_len(&command); | |
ce91d6f8 | 1009 | if (len > 900) |
1010 | len = 900; | |
95500969 | 1011 | packet_check_eom(); |
1f3bf5aa | 1012 | if (type == SSH2_MSG_CHANNEL_FAILURE) |
1013 | fatal("Request for subsystem '%.*s' failed on channel %d", | |
6c0fa2b1 | 1014 | len, (u_char *)buffer_ptr(&command), id); |
1f3bf5aa | 1015 | } |
1016 | ||
e0ae8728 | 1017 | void |
5d8d32a3 | 1018 | client_global_request_reply_fwd(int type, u_int32_t seq, void *ctxt) |
e0ae8728 | 1019 | { |
1020 | int i; | |
1021 | ||
1022 | i = client_global_request_id++; | |
5d8d32a3 | 1023 | if (i >= options.num_remote_forwards) |
e0ae8728 | 1024 | return; |
e0ae8728 | 1025 | debug("remote forward %s for: listen %d, connect %s:%d", |
1026 | type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure", | |
3867aa0a | 1027 | options.remote_forwards[i].listen_port, |
1028 | options.remote_forwards[i].connect_host, | |
1029 | options.remote_forwards[i].connect_port); | |
42ea6f5e | 1030 | if (type == SSH2_MSG_REQUEST_FAILURE) { |
1031 | if (options.exit_on_forward_failure) | |
1032 | fatal("Error: remote port forwarding failed for " | |
1033 | "listen port %d", | |
1034 | options.remote_forwards[i].listen_port); | |
1035 | else | |
1036 | logit("Warning: remote port forwarding failed for " | |
1037 | "listen port %d", | |
1038 | options.remote_forwards[i].listen_port); | |
1039 | } | |
e0ae8728 | 1040 | } |
1041 | ||
396c147e | 1042 | static void |
5e96b616 | 1043 | ssh_control_listener(void) |
8ce64345 | 1044 | { |
5e96b616 | 1045 | struct sockaddr_un addr; |
1046 | mode_t old_umask; | |
4b5df124 | 1047 | int addr_len; |
1048 | ||
9dfd96d6 | 1049 | if (options.control_path == NULL || |
1050 | options.control_master == SSHCTL_MASTER_NO) | |
5e96b616 | 1051 | return; |
b5c334cc | 1052 | |
9dfd96d6 | 1053 | debug("setting up multiplex master socket"); |
1054 | ||
5e96b616 | 1055 | memset(&addr, '\0', sizeof(addr)); |
1056 | addr.sun_family = AF_UNIX; | |
4b5df124 | 1057 | addr_len = offsetof(struct sockaddr_un, sun_path) + |
5e96b616 | 1058 | strlen(options.control_path) + 1; |
8ce64345 | 1059 | |
5e96b616 | 1060 | if (strlcpy(addr.sun_path, options.control_path, |
1061 | sizeof(addr.sun_path)) >= sizeof(addr.sun_path)) | |
1062 | fatal("ControlPath too long"); | |
8ce64345 | 1063 | |
5e96b616 | 1064 | if ((control_fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) |
17318dd6 | 1065 | fatal("%s socket(): %s", __func__, strerror(errno)); |
5e96b616 | 1066 | |
1067 | old_umask = umask(0177); | |
32596c7b | 1068 | if (bind(control_fd, (struct sockaddr *)&addr, addr_len) == -1) { |
5e96b616 | 1069 | control_fd = -1; |
05ada1a6 | 1070 | if (errno == EINVAL || errno == EADDRINUSE) |
5e96b616 | 1071 | fatal("ControlSocket %s already exists", |
1072 | options.control_path); | |
1073 | else | |
17318dd6 | 1074 | fatal("%s bind(): %s", __func__, strerror(errno)); |
8ce64345 | 1075 | } |
5e96b616 | 1076 | umask(old_umask); |
1077 | ||
1078 | if (listen(control_fd, 64) == -1) | |
17318dd6 | 1079 | fatal("%s listen(): %s", __func__, strerror(errno)); |
5e96b616 | 1080 | |
1081 | set_nonblock(control_fd); | |
1082 | } | |
1083 | ||
1084 | /* request pty/x11/agent/tcpfwd/shell for channel */ | |
1085 | static void | |
1086 | ssh_session2_setup(int id, void *arg) | |
1087 | { | |
1786be35 | 1088 | extern char **environ; |
9bf083eb | 1089 | const char *display; |
5e96b616 | 1090 | int interactive = tty_flag; |
9bf083eb | 1091 | |
56964485 | 1092 | display = getenv("DISPLAY"); |
9bf083eb | 1093 | if (options.forward_x11 && display != NULL) { |
b48eeb07 | 1094 | char *proto, *data; |
0b242b12 | 1095 | /* Get reasonable local authentication information. */ |
9bf083eb | 1096 | client_x11_get_proto(display, options.xauth_location, |
1097 | options.forward_x11_trusted, &proto, &data); | |
0b242b12 | 1098 | /* Request forwarding with authentication spoofing. */ |
1099 | debug("Requesting X11 forwarding with authentication spoofing."); | |
9bf083eb | 1100 | x11_request_forwarding_with_spoofing(id, display, proto, data); |
b5c334cc | 1101 | interactive = 1; |
0b242b12 | 1102 | /* XXX wait for reply */ |
1103 | } | |
1104 | ||
fa08c86b | 1105 | check_agent_present(); |
1106 | if (options.forward_agent) { | |
1107 | debug("Requesting authentication agent forwarding."); | |
1108 | channel_request_start(id, "auth-agent-req@openssh.com", 0); | |
1109 | packet_send(); | |
1110 | } | |
1111 | ||
a4f24bf8 | 1112 | if (options.tun_open != SSH_TUNMODE_NO) { |
d20f3c9e | 1113 | Channel *c; |
1114 | int fd; | |
1115 | ||
1116 | debug("Requesting tun."); | |
a4f24bf8 | 1117 | if ((fd = tun_open(options.tun_local, |
1118 | options.tun_open)) >= 0) { | |
d20f3c9e | 1119 | c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1, |
1120 | CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, | |
1121 | 0, "tun", 1); | |
1122 | c->datagram = 1; | |
e914f53a | 1123 | #if defined(SSH_TUN_FILTER) |
1124 | if (options.tun_open == SSH_TUNMODE_POINTOPOINT) | |
1125 | channel_register_filter(c->self, sys_tun_infilter, | |
1126 | sys_tun_outfilter); | |
1127 | #endif | |
d20f3c9e | 1128 | packet_start(SSH2_MSG_CHANNEL_OPEN); |
1129 | packet_put_cstring("tun@openssh.com"); | |
1130 | packet_put_int(c->self); | |
1131 | packet_put_int(c->local_window_max); | |
1132 | packet_put_int(c->local_maxpacket); | |
a4f24bf8 | 1133 | packet_put_int(options.tun_open); |
d20f3c9e | 1134 | packet_put_int(options.tun_remote); |
1135 | packet_send(); | |
1136 | } | |
1137 | } | |
1138 | ||
5e96b616 | 1139 | client_session2_setup(id, tty_flag, subsystem_flag, getenv("TERM"), |
1786be35 | 1140 | NULL, fileno(stdin), &command, environ, &ssh_subsystem_reply); |
1f3bf5aa | 1141 | |
b5c334cc | 1142 | packet_set_interactive(interactive); |
8ce64345 | 1143 | } |
1144 | ||
bcdb96c2 | 1145 | /* open new channel for a session */ |
396c147e | 1146 | static int |
bcdb96c2 | 1147 | ssh_session2_open(void) |
8ce64345 | 1148 | { |
719fc62f | 1149 | Channel *c; |
1150 | int window, packetmax, in, out, err; | |
2e73a022 | 1151 | |
14a9a859 | 1152 | if (stdin_null_flag) { |
5ca51e19 | 1153 | in = open(_PATH_DEVNULL, O_RDONLY); |
14a9a859 | 1154 | } else { |
1155 | in = dup(STDIN_FILENO); | |
1156 | } | |
2e73a022 | 1157 | out = dup(STDOUT_FILENO); |
1158 | err = dup(STDERR_FILENO); | |
8ce64345 | 1159 | |
1160 | if (in < 0 || out < 0 || err < 0) | |
14a9a859 | 1161 | fatal("dup() in/out/err failed"); |
8ce64345 | 1162 | |
a22aff1f | 1163 | /* enable nonblocking unless tty */ |
1164 | if (!isatty(in)) | |
1165 | set_nonblock(in); | |
1166 | if (!isatty(out)) | |
1167 | set_nonblock(out); | |
1168 | if (!isatty(err)) | |
1169 | set_nonblock(err); | |
1170 | ||
bcbf86ec | 1171 | window = CHAN_SES_WINDOW_DEFAULT; |
1172 | packetmax = CHAN_SES_PACKET_DEFAULT; | |
ea9700ba | 1173 | if (tty_flag) { |
1174 | window >>= 1; | |
1175 | packetmax >>= 1; | |
8ce64345 | 1176 | } |
719fc62f | 1177 | c = channel_new( |
8ce64345 | 1178 | "session", SSH_CHANNEL_OPENING, in, out, err, |
bcbf86ec | 1179 | window, packetmax, CHAN_EXTENDED_WRITE, |
0d942eff | 1180 | "client-session", /*nonblock*/0); |
8ce64345 | 1181 | |
bcdb96c2 | 1182 | debug3("ssh_session2_open: channel_new: %d", c->self); |
eb0dd41f | 1183 | |
36e1f6a1 | 1184 | channel_send_open(c->self); |
bcdb96c2 | 1185 | if (!no_shell_flag) |
5e96b616 | 1186 | channel_register_confirm(c->self, ssh_session2_setup, NULL); |
5260325f | 1187 | |
719fc62f | 1188 | return c->self; |
eb0dd41f | 1189 | } |
1190 | ||
396c147e | 1191 | static int |
eb0dd41f | 1192 | ssh_session2(void) |
1193 | { | |
bcdb96c2 | 1194 | int id = -1; |
eb0dd41f | 1195 | |
1196 | /* XXX should be pre-session */ | |
1197 | ssh_init_forwarding(); | |
5e96b616 | 1198 | ssh_control_listener(); |
eb0dd41f | 1199 | |
bcdb96c2 | 1200 | if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN)) |
1201 | id = ssh_session2_open(); | |
eb0dd41f | 1202 | |
d20f3c9e | 1203 | /* Execute a local command */ |
1204 | if (options.local_command != NULL && | |
1205 | options.permit_local_command) | |
1206 | ssh_local_cmd(options.local_command); | |
1207 | ||
eb0dd41f | 1208 | /* If requested, let ssh continue in the background. */ |
1209 | if (fork_after_authentication_flag) | |
1210 | if (daemon(1, 1) < 0) | |
1211 | fatal("daemon() failed: %.200s", strerror(errno)); | |
1212 | ||
4bf9c10e | 1213 | return client_loop(tty_flag, tty_flag ? |
1214 | options.escape_char : SSH_ESCAPECHAR_NONE, id); | |
8efc0c15 | 1215 | } |
fa08c86b | 1216 | |
396c147e | 1217 | static void |
fee56204 | 1218 | load_public_identity_files(void) |
1219 | { | |
8cffe22a | 1220 | char *filename, *cp, thishost[NI_MAXHOST]; |
2e23cde0 | 1221 | int i = 0; |
0659cace | 1222 | Key *public; |
8cffe22a | 1223 | struct passwd *pw; |
383546c4 | 1224 | #ifdef SMARTCARD |
0659cace | 1225 | Key **keys; |
1226 | ||
9ff6f66f | 1227 | if (options.smartcard_device != NULL && |
0659cace | 1228 | options.num_identity_files < SSH_MAX_IDENTITY_FILES && |
1229 | (keys = sc_get_keys(options.smartcard_device, NULL)) != NULL ) { | |
1230 | int count = 0; | |
1231 | for (i = 0; keys[i] != NULL; i++) { | |
1232 | count++; | |
0659cace | 1233 | memmove(&options.identity_files[1], &options.identity_files[0], |
1234 | sizeof(char *) * (SSH_MAX_IDENTITY_FILES - 1)); | |
1235 | memmove(&options.identity_keys[1], &options.identity_keys[0], | |
1236 | sizeof(Key *) * (SSH_MAX_IDENTITY_FILES - 1)); | |
1237 | options.num_identity_files++; | |
1238 | options.identity_keys[0] = keys[i]; | |
244e796f | 1239 | options.identity_files[0] = sc_get_key_label(keys[i]); |
0659cace | 1240 | } |
1c2deed1 | 1241 | if (options.num_identity_files > SSH_MAX_IDENTITY_FILES) |
1242 | options.num_identity_files = SSH_MAX_IDENTITY_FILES; | |
0659cace | 1243 | i = count; |
1244 | xfree(keys); | |
383546c4 | 1245 | } |
3e984472 | 1246 | #endif /* SMARTCARD */ |
8cffe22a | 1247 | if ((pw = getpwuid(original_real_uid)) == NULL) |
1248 | fatal("load_public_identity_files: getpwuid failed"); | |
1249 | if (gethostname(thishost, sizeof(thishost)) == -1) | |
1250 | fatal("load_public_identity_files: gethostname: %s", | |
1251 | strerror(errno)); | |
2e23cde0 | 1252 | for (; i < options.num_identity_files; i++) { |
8cffe22a | 1253 | cp = tilde_expand_filename(options.identity_files[i], |
2e23cde0 | 1254 | original_real_uid); |
8cffe22a | 1255 | filename = percent_expand(cp, "d", pw->pw_dir, |
1256 | "u", pw->pw_name, "l", thishost, "h", host, | |
1257 | "r", options.user, (char *)NULL); | |
1258 | xfree(cp); | |
2e23cde0 | 1259 | public = key_load_public(filename, NULL); |
1260 | debug("identity file %s type %d", filename, | |
1261 | public ? public->type : -1); | |
1262 | xfree(options.identity_files[i]); | |
1263 | options.identity_files[i] = filename; | |
1264 | options.identity_keys[i] = public; | |
1265 | } | |
fee56204 | 1266 | } |
5e96b616 | 1267 | |
1268 | static void | |
1269 | control_client_sighandler(int signo) | |
1270 | { | |
1271 | control_client_terminate = signo; | |
1272 | } | |
1273 | ||
1274 | static void | |
1275 | control_client_sigrelay(int signo) | |
1276 | { | |
1277 | if (control_server_pid > 1) | |
1278 | kill(control_server_pid, signo); | |
1279 | } | |
1280 | ||
67a08279 | 1281 | static int |
1282 | env_permitted(char *env) | |
1283 | { | |
0ad62016 | 1284 | int i, ret; |
67a08279 | 1285 | char name[1024], *cp; |
1286 | ||
0ad62016 | 1287 | if ((cp = strchr(env, '=')) == NULL || cp == env) |
67a08279 | 1288 | return (0); |
00c8971b | 1289 | ret = snprintf(name, sizeof(name), "%.*s", (int)(cp - env), env); |
0ad62016 | 1290 | if (ret <= 0 || (size_t)ret >= sizeof(name)) |
1291 | fatal("env_permitted: name '%.100s...' too long", env); | |
67a08279 | 1292 | |
1293 | for (i = 0; i < options.num_send_env; i++) | |
1294 | if (match_pattern(name, options.send_env[i])) | |
1295 | return (1); | |
1296 | ||
1297 | return (0); | |
1298 | } | |
1299 | ||
5e96b616 | 1300 | static void |
1301 | control_client(const char *path) | |
1302 | { | |
1303 | struct sockaddr_un addr; | |
a7e124fe | 1304 | int i, r, fd, sock, exitval, num_env, addr_len; |
5e96b616 | 1305 | Buffer m; |
f8c6db83 | 1306 | char *term; |
1786be35 | 1307 | extern char **environ; |
f8c6db83 | 1308 | u_int flags; |
f2107e97 | 1309 | |
9dfd96d6 | 1310 | if (mux_command == 0) |
1311 | mux_command = SSHMUX_COMMAND_OPEN; | |
1312 | ||
1313 | switch (options.control_master) { | |
1314 | case SSHCTL_MASTER_AUTO: | |
1315 | case SSHCTL_MASTER_AUTO_ASK: | |
1316 | debug("auto-mux: Trying existing master"); | |
1317 | /* FALLTHROUGH */ | |
1318 | case SSHCTL_MASTER_NO: | |
1319 | break; | |
1320 | default: | |
1321 | return; | |
1322 | } | |
1323 | ||
5e96b616 | 1324 | memset(&addr, '\0', sizeof(addr)); |
1325 | addr.sun_family = AF_UNIX; | |
4b5df124 | 1326 | addr_len = offsetof(struct sockaddr_un, sun_path) + |
5e96b616 | 1327 | strlen(path) + 1; |
1328 | ||
1329 | if (strlcpy(addr.sun_path, path, | |
1330 | sizeof(addr.sun_path)) >= sizeof(addr.sun_path)) | |
1331 | fatal("ControlPath too long"); | |
1332 | ||
1333 | if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) | |
1334 | fatal("%s socket(): %s", __func__, strerror(errno)); | |
1335 | ||
32596c7b | 1336 | if (connect(sock, (struct sockaddr *)&addr, addr_len) == -1) { |
19186c3d | 1337 | if (mux_command != SSHMUX_COMMAND_OPEN) { |
1338 | fatal("Control socket connect(%.100s): %s", path, | |
1339 | strerror(errno)); | |
1340 | } | |
f6740270 | 1341 | if (errno == ENOENT) |
7de98c39 | 1342 | debug("Control socket \"%.100s\" does not exist", path); |
f6740270 | 1343 | else { |
7de98c39 | 1344 | error("Control socket connect(%.100s): %s", path, |
f6740270 | 1345 | strerror(errno)); |
1346 | } | |
7de98c39 | 1347 | close(sock); |
1348 | return; | |
1349 | } | |
1350 | ||
1351 | if (stdin_null_flag) { | |
1352 | if ((fd = open(_PATH_DEVNULL, O_RDONLY)) == -1) | |
1353 | fatal("open(/dev/null): %s", strerror(errno)); | |
1354 | if (dup2(fd, STDIN_FILENO) == -1) | |
1355 | fatal("dup2: %s", strerror(errno)); | |
1356 | if (fd > STDERR_FILENO) | |
1357 | close(fd); | |
1358 | } | |
56964485 | 1359 | |
ef07103c | 1360 | term = getenv("TERM"); |
f8c6db83 | 1361 | |
1362 | flags = 0; | |
1363 | if (tty_flag) | |
1364 | flags |= SSHMUX_FLAG_TTY; | |
1365 | if (subsystem_flag) | |
1366 | flags |= SSHMUX_FLAG_SUBSYS; | |
ef07103c | 1367 | if (options.forward_x11) |
1368 | flags |= SSHMUX_FLAG_X11_FWD; | |
1369 | if (options.forward_agent) | |
1370 | flags |= SSHMUX_FLAG_AGENT_FWD; | |
5e96b616 | 1371 | |
5e96b616 | 1372 | buffer_init(&m); |
1373 | ||
f8c6db83 | 1374 | /* Send our command to server */ |
1375 | buffer_put_int(&m, mux_command); | |
1376 | buffer_put_int(&m, flags); | |
ef07103c | 1377 | if (ssh_msg_send(sock, SSHMUX_VER, &m) == -1) |
f8c6db83 | 1378 | fatal("%s: msg_send", __func__); |
1379 | buffer_clear(&m); | |
1380 | ||
1381 | /* Get authorisation status and PID of controlee */ | |
5e96b616 | 1382 | if (ssh_msg_recv(sock, &m) == -1) |
1383 | fatal("%s: msg_recv", __func__); | |
ef07103c | 1384 | if (buffer_get_char(&m) != SSHMUX_VER) |
5e96b616 | 1385 | fatal("%s: wrong version", __func__); |
0d34d6ce | 1386 | if (buffer_get_int(&m) != 1) |
1387 | fatal("Connection to master denied"); | |
5e96b616 | 1388 | control_server_pid = buffer_get_int(&m); |
1389 | ||
5e96b616 | 1390 | buffer_clear(&m); |
5e96b616 | 1391 | |
f8c6db83 | 1392 | switch (mux_command) { |
1393 | case SSHMUX_COMMAND_ALIVE_CHECK: | |
f8cc7664 | 1394 | fprintf(stderr, "Master running (pid=%d)\r\n", |
f8c6db83 | 1395 | control_server_pid); |
1396 | exit(0); | |
1397 | case SSHMUX_COMMAND_TERMINATE: | |
1398 | fprintf(stderr, "Exit request sent.\r\n"); | |
1399 | exit(0); | |
1400 | case SSHMUX_COMMAND_OPEN: | |
1401 | /* continue below */ | |
1402 | break; | |
1403 | default: | |
1404 | fatal("silly mux_command %d", mux_command); | |
1405 | } | |
1406 | ||
1407 | /* SSHMUX_COMMAND_OPEN */ | |
ef07103c | 1408 | buffer_put_cstring(&m, term ? term : ""); |
5e96b616 | 1409 | buffer_append(&command, "\0", 1); |
1410 | buffer_put_cstring(&m, buffer_ptr(&command)); | |
1411 | ||
67a08279 | 1412 | if (options.num_send_env == 0 || environ == NULL) { |
1413 | buffer_put_int(&m, 0); | |
f2107e97 | 1414 | } else { |
67a08279 | 1415 | /* Pass environment */ |
1416 | num_env = 0; | |
1417 | for (i = 0; environ[i] != NULL; i++) | |
1418 | if (env_permitted(environ[i])) | |
1419 | num_env++; /* Count */ | |
f2107e97 | 1420 | |
67a08279 | 1421 | buffer_put_int(&m, num_env); |
1422 | ||
77c50919 | 1423 | for (i = 0; environ[i] != NULL && num_env >= 0; i++) |
1424 | if (env_permitted(environ[i])) { | |
1425 | num_env--; | |
67a08279 | 1426 | buffer_put_cstring(&m, environ[i]); |
77c50919 | 1427 | } |
67a08279 | 1428 | } |
1786be35 | 1429 | |
ef07103c | 1430 | if (ssh_msg_send(sock, SSHMUX_VER, &m) == -1) |
5e96b616 | 1431 | fatal("%s: msg_send", __func__); |
1432 | ||
1433 | mm_send_fd(sock, STDIN_FILENO); | |
1434 | mm_send_fd(sock, STDOUT_FILENO); | |
1435 | mm_send_fd(sock, STDERR_FILENO); | |
1436 | ||
1437 | /* Wait for reply, so master has a chance to gather ttymodes */ | |
1438 | buffer_clear(&m); | |
1439 | if (ssh_msg_recv(sock, &m) == -1) | |
1440 | fatal("%s: msg_recv", __func__); | |
ef07103c | 1441 | if (buffer_get_char(&m) != SSHMUX_VER) |
f8c6db83 | 1442 | fatal("%s: wrong version", __func__); |
5e96b616 | 1443 | buffer_free(&m); |
1444 | ||
d3e5d1e9 | 1445 | signal(SIGHUP, control_client_sighandler); |
78d2b454 | 1446 | signal(SIGINT, control_client_sighandler); |
1447 | signal(SIGTERM, control_client_sighandler); | |
1448 | signal(SIGWINCH, control_client_sigrelay); | |
1449 | ||
5e96b616 | 1450 | if (tty_flag) |
1451 | enter_raw_mode(); | |
1452 | ||
1453 | /* Stick around until the controlee closes the client_fd */ | |
1454 | exitval = 0; | |
1455 | for (;!control_client_terminate;) { | |
1456 | r = read(sock, &exitval, sizeof(exitval)); | |
1457 | if (r == 0) { | |
1458 | debug2("Received EOF from master"); | |
1459 | break; | |
1460 | } | |
1461 | if (r > 0) | |
1462 | debug2("Received exit status from master %d", exitval); | |
1463 | if (r == -1 && errno != EINTR) | |
1464 | fatal("%s: read %s", __func__, strerror(errno)); | |
1465 | } | |
1466 | ||
1467 | if (control_client_terminate) | |
1468 | debug2("Exiting on signal %d", control_client_terminate); | |
1469 | ||
1470 | close(sock); | |
1471 | ||
1472 | leave_raw_mode(); | |
1473 | ||
1474 | if (tty_flag && options.log_level != SYSLOG_LEVEL_QUIET) | |
1475 | fprintf(stderr, "Connection to master closed.\r\n"); | |
1476 | ||
1477 | exit(exitval); | |
1478 | } |