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e74dc197 | 1 | /* $OpenBSD: ssh.c,v 1.309 2008/01/19 20:51:26 djm Exp $ */ |
3c0ef626 | 2 | /* |
3 | * Author: Tatu Ylonen <ylo@cs.hut.fi> | |
4 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
5 | * All rights reserved | |
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 | * | |
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. | |
540d72c3 | 17 | * Copyright (c) 2000, 2001, 2002, 2003 Markus Friedl. All rights reserved. |
3c0ef626 | 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. | |
41 | */ | |
42 | ||
43 | #include "includes.h" | |
30460aeb | 44 | |
45 | #include <sys/types.h> | |
46 | #ifdef HAVE_SYS_STAT_H | |
47 | # include <sys/stat.h> | |
48 | #endif | |
49 | #include <sys/resource.h> | |
50 | #include <sys/ioctl.h> | |
51 | #include <sys/socket.h> | |
52 | #include <sys/un.h> | |
53 | ||
54 | #include <ctype.h> | |
55 | #include <errno.h> | |
56 | #include <fcntl.h> | |
57 | #include <netdb.h> | |
58 | #ifdef HAVE_PATHS_H | |
59 | #include <paths.h> | |
60 | #endif | |
61 | #include <pwd.h> | |
62 | #include <signal.h> | |
63 | #include <stdarg.h> | |
64 | #include <stddef.h> | |
65 | #include <stdio.h> | |
66 | #include <stdlib.h> | |
67 | #include <string.h> | |
68 | #include <unistd.h> | |
69 | ||
70 | #include <netinet/in.h> | |
71 | #include <arpa/inet.h> | |
3c0ef626 | 72 | |
73 | #include <openssl/evp.h> | |
74 | #include <openssl/err.h> | |
e74dc197 | 75 | #include "openbsd-compat/openssl-compat.h" |
3c0ef626 | 76 | |
30460aeb | 77 | #include "xmalloc.h" |
3c0ef626 | 78 | #include "ssh.h" |
79 | #include "ssh1.h" | |
80 | #include "ssh2.h" | |
81 | #include "compat.h" | |
82 | #include "cipher.h" | |
3c0ef626 | 83 | #include "packet.h" |
84 | #include "buffer.h" | |
3c0ef626 | 85 | #include "channels.h" |
86 | #include "key.h" | |
87 | #include "authfd.h" | |
88 | #include "authfile.h" | |
89 | #include "pathnames.h" | |
7e82606e | 90 | #include "dispatch.h" |
3c0ef626 | 91 | #include "clientloop.h" |
92 | #include "log.h" | |
93 | #include "readconf.h" | |
94 | #include "sshconnect.h" | |
3c0ef626 | 95 | #include "misc.h" |
96 | #include "kex.h" | |
97 | #include "mac.h" | |
7e82606e | 98 | #include "sshpty.h" |
99 | #include "match.h" | |
100 | #include "msg.h" | |
101 | #include "monitor_fdpass.h" | |
102 | #include "uidswap.h" | |
30460aeb | 103 | #include "version.h" |
3c0ef626 | 104 | |
105 | #ifdef SMARTCARD | |
3c0ef626 | 106 | #include "scard.h" |
107 | #endif | |
108 | ||
3c0ef626 | 109 | extern char *__progname; |
3c0ef626 | 110 | |
3c0ef626 | 111 | /* Flag indicating whether debug mode is on. This can be set on the command line. */ |
112 | int debug_flag = 0; | |
113 | ||
114 | /* Flag indicating whether a tty should be allocated */ | |
115 | int tty_flag = 0; | |
116 | int no_tty_flag = 0; | |
117 | int force_tty_flag = 0; | |
118 | ||
119 | /* don't exec a shell */ | |
120 | int no_shell_flag = 0; | |
121 | ||
122 | /* | |
123 | * Flag indicating that nothing should be read from stdin. This can be set | |
124 | * on the command line. | |
125 | */ | |
126 | int stdin_null_flag = 0; | |
127 | ||
128 | /* | |
129 | * Flag indicating that ssh should fork after authentication. This is useful | |
44a053a3 | 130 | * so that the passphrase can be entered manually, and then ssh goes to the |
3c0ef626 | 131 | * background. |
132 | */ | |
133 | int fork_after_authentication_flag = 0; | |
134 | ||
135 | /* | |
136 | * General data structure for command line options and options configurable | |
137 | * in configuration files. See readconf.h. | |
138 | */ | |
139 | Options options; | |
140 | ||
141 | /* optional user configfile */ | |
142 | char *config = NULL; | |
143 | ||
144 | /* | |
145 | * Name of the host we are connecting to. This is the name given on the | |
146 | * command line, or the HostName specified for the user-supplied name in a | |
147 | * configuration file. | |
148 | */ | |
149 | char *host; | |
150 | ||
151 | /* socket address the host resolves to */ | |
152 | struct sockaddr_storage hostaddr; | |
153 | ||
154 | /* Private host keys. */ | |
44a053a3 | 155 | Sensitive sensitive_data; |
3c0ef626 | 156 | |
157 | /* Original real UID. */ | |
158 | uid_t original_real_uid; | |
44a053a3 | 159 | uid_t original_effective_uid; |
3c0ef626 | 160 | |
161 | /* command to be executed */ | |
162 | Buffer command; | |
163 | ||
164 | /* Should we execute a command or invoke a subsystem? */ | |
165 | int subsystem_flag = 0; | |
166 | ||
c6046bb0 | 167 | /* # of replies received for global requests */ |
168 | static int client_global_request_id = 0; | |
169 | ||
d03f4262 | 170 | /* pid of proxycommand child process */ |
171 | pid_t proxy_command_pid = 0; | |
172 | ||
7e82606e | 173 | /* fd to control socket */ |
174 | int control_fd = -1; | |
175 | ||
dfddba3d | 176 | /* Multiplexing control command */ |
2ce0bfe4 | 177 | static u_int mux_command = 0; |
dfddba3d | 178 | |
7e82606e | 179 | /* Only used in control client mode */ |
180 | volatile sig_atomic_t control_client_terminate = 0; | |
181 | u_int control_server_pid = 0; | |
182 | ||
3c0ef626 | 183 | /* Prints a help message to the user. This function never returns. */ |
184 | ||
185 | static void | |
186 | usage(void) | |
187 | { | |
12a403af | 188 | fprintf(stderr, |
fa0f0f45 | 189 | "usage: ssh [-1246AaCfgKkMNnqsTtVvXxY] [-b bind_address] [-c cipher_spec]\n" |
08822d99 | 190 | " [-D [bind_address:]port] [-e escape_char] [-F configfile]\n" |
dfddba3d | 191 | " [-i identity_file] [-L [bind_address:]port:host:hostport]\n" |
192 | " [-l login_name] [-m mac_spec] [-O ctl_cmd] [-o option] [-p port]\n" | |
193 | " [-R [bind_address:]port:host:hostport] [-S ctl_path]\n" | |
30460aeb | 194 | " [-w local_tun[:remote_tun]] [user@]hostname [command]\n" |
12a403af | 195 | ); |
08822d99 | 196 | exit(255); |
3c0ef626 | 197 | } |
198 | ||
3c0ef626 | 199 | static int ssh_session(void); |
200 | static int ssh_session2(void); | |
201 | static void load_public_identity_files(void); | |
7e82606e | 202 | static void control_client(const char *path); |
3c0ef626 | 203 | |
204 | /* | |
205 | * Main program for the ssh client. | |
206 | */ | |
207 | int | |
208 | main(int ac, char **av) | |
209 | { | |
44a053a3 | 210 | int i, opt, exit_status; |
540d72c3 | 211 | char *p, *cp, *line, buf[256]; |
3c0ef626 | 212 | struct stat st; |
213 | struct passwd *pw; | |
e74dc197 | 214 | int dummy, timeout_ms; |
3c0ef626 | 215 | extern int optind, optreset; |
216 | extern char *optarg; | |
2ce0bfe4 | 217 | struct servent *sp; |
dfddba3d | 218 | Forward fwd; |
3c0ef626 | 219 | |
08822d99 | 220 | /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ |
221 | sanitise_stdfd(); | |
222 | ||
7cac2b65 | 223 | __progname = ssh_get_progname(av[0]); |
3c0ef626 | 224 | init_rng(); |
225 | ||
226 | /* | |
227 | * Save the original real uid. It will be needed later (uid-swapping | |
228 | * may clobber the real uid). | |
229 | */ | |
230 | original_real_uid = getuid(); | |
231 | original_effective_uid = geteuid(); | |
540d72c3 | 232 | |
d03f4262 | 233 | /* |
234 | * Use uid-swapping to give up root privileges for the duration of | |
235 | * option processing. We will re-instantiate the rights when we are | |
236 | * ready to create the privileged port, and will permanently drop | |
237 | * them when the port has been created (actually, when the connection | |
238 | * has been made, as we may need to create the port several times). | |
239 | */ | |
240 | PRIV_END; | |
3c0ef626 | 241 | |
242 | #ifdef HAVE_SETRLIMIT | |
243 | /* If we are installed setuid root be careful to not drop core. */ | |
244 | if (original_real_uid != original_effective_uid) { | |
245 | struct rlimit rlim; | |
246 | rlim.rlim_cur = rlim.rlim_max = 0; | |
247 | if (setrlimit(RLIMIT_CORE, &rlim) < 0) | |
248 | fatal("setrlimit failed: %.100s", strerror(errno)); | |
249 | } | |
250 | #endif | |
251 | /* Get user data. */ | |
252 | pw = getpwuid(original_real_uid); | |
253 | if (!pw) { | |
7cac2b65 | 254 | logit("You don't exist, go away!"); |
08822d99 | 255 | exit(255); |
3c0ef626 | 256 | } |
257 | /* Take a copy of the returned structure. */ | |
258 | pw = pwcopy(pw); | |
259 | ||
3c0ef626 | 260 | /* |
261 | * Set our umask to something reasonable, as some files are created | |
262 | * with the default umask. This will make them world-readable but | |
263 | * writable only by the owner, which is ok for all files for which we | |
264 | * don't set the modes explicitly. | |
265 | */ | |
266 | umask(022); | |
267 | ||
268 | /* Initialize option structure to indicate that no values have been set. */ | |
269 | initialize_options(&options); | |
270 | ||
271 | /* Parse command-line arguments. */ | |
272 | host = NULL; | |
473db5ab | 273 | |
30460aeb | 274 | again: |
3c0ef626 | 275 | while ((opt = getopt(ac, av, |
fa0f0f45 | 276 | "1246ab:c:e:fgi:kl:m:no:p:qstvxACD:F:I:KL:MNO:PR:S:TVw:XY")) != -1) { |
3c0ef626 | 277 | switch (opt) { |
278 | case '1': | |
279 | options.protocol = SSH_PROTO_1; | |
280 | break; | |
281 | case '2': | |
282 | options.protocol = SSH_PROTO_2; | |
283 | break; | |
284 | case '4': | |
7cac2b65 | 285 | options.address_family = AF_INET; |
3c0ef626 | 286 | break; |
287 | case '6': | |
7cac2b65 | 288 | options.address_family = AF_INET6; |
3c0ef626 | 289 | break; |
290 | case 'n': | |
291 | stdin_null_flag = 1; | |
292 | break; | |
293 | case 'f': | |
294 | fork_after_authentication_flag = 1; | |
295 | stdin_null_flag = 1; | |
296 | break; | |
297 | case 'x': | |
298 | options.forward_x11 = 0; | |
299 | break; | |
300 | case 'X': | |
301 | options.forward_x11 = 1; | |
302 | break; | |
540d72c3 | 303 | case 'Y': |
304 | options.forward_x11 = 1; | |
305 | options.forward_x11_trusted = 1; | |
306 | break; | |
3c0ef626 | 307 | case 'g': |
308 | options.gateway_ports = 1; | |
309 | break; | |
dfddba3d | 310 | case 'O': |
311 | if (strcmp(optarg, "check") == 0) | |
312 | mux_command = SSHMUX_COMMAND_ALIVE_CHECK; | |
313 | else if (strcmp(optarg, "exit") == 0) | |
314 | mux_command = SSHMUX_COMMAND_TERMINATE; | |
315 | else | |
316 | fatal("Invalid multiplex command."); | |
317 | break; | |
d03f4262 | 318 | case 'P': /* deprecated */ |
3c0ef626 | 319 | options.use_privileged_port = 0; |
320 | break; | |
321 | case 'a': | |
322 | options.forward_agent = 0; | |
323 | break; | |
324 | case 'A': | |
325 | options.forward_agent = 1; | |
326 | break; | |
3c0ef626 | 327 | case 'k': |
540d72c3 | 328 | options.gss_deleg_creds = 0; |
3c0ef626 | 329 | break; |
fa0f0f45 | 330 | case 'K': |
331 | options.gss_authentication = 1; | |
332 | options.gss_deleg_creds = 1; | |
333 | break; | |
3c0ef626 | 334 | case 'i': |
335 | if (stat(optarg, &st) < 0) { | |
336 | fprintf(stderr, "Warning: Identity file %s " | |
dfddba3d | 337 | "not accessible: %s.\n", optarg, |
338 | strerror(errno)); | |
3c0ef626 | 339 | break; |
340 | } | |
341 | if (options.num_identity_files >= | |
342 | SSH_MAX_IDENTITY_FILES) | |
343 | fatal("Too many identity files specified " | |
344 | "(max %d)", SSH_MAX_IDENTITY_FILES); | |
345 | options.identity_files[options.num_identity_files++] = | |
346 | xstrdup(optarg); | |
347 | break; | |
348 | case 'I': | |
349 | #ifdef SMARTCARD | |
350 | options.smartcard_device = xstrdup(optarg); | |
351 | #else | |
352 | fprintf(stderr, "no support for smartcards.\n"); | |
353 | #endif | |
354 | break; | |
355 | case 't': | |
356 | if (tty_flag) | |
357 | force_tty_flag = 1; | |
358 | tty_flag = 1; | |
359 | break; | |
360 | case 'v': | |
7cac2b65 | 361 | if (debug_flag == 0) { |
3c0ef626 | 362 | debug_flag = 1; |
363 | options.log_level = SYSLOG_LEVEL_DEBUG1; | |
7cac2b65 | 364 | } else { |
365 | if (options.log_level < SYSLOG_LEVEL_DEBUG3) | |
366 | options.log_level++; | |
3c0ef626 | 367 | break; |
7cac2b65 | 368 | } |
dfddba3d | 369 | /* FALLTHROUGH */ |
3c0ef626 | 370 | case 'V': |
12a403af | 371 | fprintf(stderr, "%s, %s\n", |
dfddba3d | 372 | SSH_RELEASE, SSLeay_version(SSLEAY_VERSION)); |
3c0ef626 | 373 | if (opt == 'V') |
374 | exit(0); | |
375 | break; | |
08822d99 | 376 | case 'w': |
377 | if (options.tun_open == -1) | |
378 | options.tun_open = SSH_TUNMODE_DEFAULT; | |
379 | options.tun_local = a2tun(optarg, &options.tun_remote); | |
380 | if (options.tun_local == SSH_TUNID_ERR) { | |
381 | fprintf(stderr, "Bad tun device '%s'\n", optarg); | |
382 | exit(255); | |
383 | } | |
384 | break; | |
3c0ef626 | 385 | case 'q': |
386 | options.log_level = SYSLOG_LEVEL_QUIET; | |
387 | break; | |
388 | case 'e': | |
389 | if (optarg[0] == '^' && optarg[2] == 0 && | |
390 | (u_char) optarg[1] >= 64 && | |
391 | (u_char) optarg[1] < 128) | |
392 | options.escape_char = (u_char) optarg[1] & 31; | |
393 | else if (strlen(optarg) == 1) | |
394 | options.escape_char = (u_char) optarg[0]; | |
395 | else if (strcmp(optarg, "none") == 0) | |
396 | options.escape_char = SSH_ESCAPECHAR_NONE; | |
397 | else { | |
398 | fprintf(stderr, "Bad escape character '%s'.\n", | |
399 | optarg); | |
08822d99 | 400 | exit(255); |
3c0ef626 | 401 | } |
402 | break; | |
403 | case 'c': | |
404 | if (ciphers_valid(optarg)) { | |
405 | /* SSH2 only */ | |
406 | options.ciphers = xstrdup(optarg); | |
7e82606e | 407 | options.cipher = SSH_CIPHER_INVALID; |
3c0ef626 | 408 | } else { |
409 | /* SSH1 only */ | |
410 | options.cipher = cipher_number(optarg); | |
411 | if (options.cipher == -1) { | |
412 | fprintf(stderr, | |
413 | "Unknown cipher type '%s'\n", | |
414 | optarg); | |
08822d99 | 415 | exit(255); |
3c0ef626 | 416 | } |
417 | if (options.cipher == SSH_CIPHER_3DES) | |
418 | options.ciphers = "3des-cbc"; | |
419 | else if (options.cipher == SSH_CIPHER_BLOWFISH) | |
420 | options.ciphers = "blowfish-cbc"; | |
421 | else | |
422 | options.ciphers = (char *)-1; | |
423 | } | |
424 | break; | |
425 | case 'm': | |
426 | if (mac_valid(optarg)) | |
427 | options.macs = xstrdup(optarg); | |
428 | else { | |
429 | fprintf(stderr, "Unknown mac type '%s'\n", | |
430 | optarg); | |
08822d99 | 431 | exit(255); |
3c0ef626 | 432 | } |
433 | break; | |
7e82606e | 434 | case 'M': |
2ce0bfe4 | 435 | if (options.control_master == SSHCTL_MASTER_YES) |
436 | options.control_master = SSHCTL_MASTER_ASK; | |
437 | else | |
438 | options.control_master = SSHCTL_MASTER_YES; | |
7e82606e | 439 | break; |
3c0ef626 | 440 | case 'p': |
441 | options.port = a2port(optarg); | |
442 | if (options.port == 0) { | |
443 | fprintf(stderr, "Bad port '%s'\n", optarg); | |
08822d99 | 444 | exit(255); |
3c0ef626 | 445 | } |
446 | break; | |
447 | case 'l': | |
448 | options.user = optarg; | |
449 | break; | |
450 | ||
451 | case 'L': | |
dfddba3d | 452 | if (parse_forward(&fwd, optarg)) |
453 | add_local_forward(&options, &fwd); | |
454 | else { | |
3c0ef626 | 455 | fprintf(stderr, |
dfddba3d | 456 | "Bad local forwarding specification '%s'\n", |
3c0ef626 | 457 | optarg); |
08822d99 | 458 | exit(255); |
3c0ef626 | 459 | } |
dfddba3d | 460 | break; |
461 | ||
462 | case 'R': | |
463 | if (parse_forward(&fwd, optarg)) { | |
464 | add_remote_forward(&options, &fwd); | |
465 | } else { | |
3c0ef626 | 466 | fprintf(stderr, |
dfddba3d | 467 | "Bad remote forwarding specification " |
468 | "'%s'\n", optarg); | |
08822d99 | 469 | exit(255); |
3c0ef626 | 470 | } |
3c0ef626 | 471 | break; |
472 | ||
473 | case 'D': | |
dfddba3d | 474 | cp = p = xstrdup(optarg); |
475 | memset(&fwd, '\0', sizeof(fwd)); | |
476 | fwd.connect_host = "socks"; | |
477 | if ((fwd.listen_host = hpdelim(&cp)) == NULL) { | |
478 | fprintf(stderr, "Bad dynamic forwarding " | |
479 | "specification '%.100s'\n", optarg); | |
08822d99 | 480 | exit(255); |
dfddba3d | 481 | } |
482 | if (cp != NULL) { | |
483 | fwd.listen_port = a2port(cp); | |
484 | fwd.listen_host = cleanhostname(fwd.listen_host); | |
485 | } else { | |
486 | fwd.listen_port = a2port(fwd.listen_host); | |
2ce0bfe4 | 487 | fwd.listen_host = NULL; |
dfddba3d | 488 | } |
489 | ||
490 | if (fwd.listen_port == 0) { | |
3c0ef626 | 491 | fprintf(stderr, "Bad dynamic port '%s'\n", |
492 | optarg); | |
08822d99 | 493 | exit(255); |
3c0ef626 | 494 | } |
dfddba3d | 495 | add_local_forward(&options, &fwd); |
496 | xfree(p); | |
3c0ef626 | 497 | break; |
498 | ||
499 | case 'C': | |
500 | options.compression = 1; | |
501 | break; | |
502 | case 'N': | |
503 | no_shell_flag = 1; | |
504 | no_tty_flag = 1; | |
3c0ef626 | 505 | break; |
e74dc197 | 506 | case 'T': |
507 | no_tty_flag = 1; | |
508 | /* ensure that the user doesn't try to backdoor a */ | |
509 | /* null cipher switch on an interactive session */ | |
510 | /* so explicitly disable it no matter what */ | |
511 | options.none_switch=0; | |
512 | break; | |
3c0ef626 | 513 | case 'o': |
514 | dummy = 1; | |
540d72c3 | 515 | line = xstrdup(optarg); |
3c0ef626 | 516 | if (process_config_line(&options, host ? host : "", |
540d72c3 | 517 | line, "command-line", 0, &dummy) != 0) |
08822d99 | 518 | exit(255); |
540d72c3 | 519 | xfree(line); |
3c0ef626 | 520 | break; |
521 | case 's': | |
522 | subsystem_flag = 1; | |
523 | break; | |
7e82606e | 524 | case 'S': |
525 | if (options.control_path != NULL) | |
526 | free(options.control_path); | |
527 | options.control_path = xstrdup(optarg); | |
528 | break; | |
3c0ef626 | 529 | case 'b': |
530 | options.bind_address = optarg; | |
3f48cae5 | 531 | break; |
3f750d99 | 532 | case 'F': |
533 | config = optarg; | |
534 | break; | |
3c0ef626 | 535 | default: |
536 | usage(); | |
537 | } | |
538 | } | |
539 | ||
540 | ac -= optind; | |
541 | av += optind; | |
542 | ||
543 | if (ac > 0 && !host && **av != '-') { | |
bfe49944 | 544 | if (strrchr(*av, '@')) { |
3c0ef626 | 545 | p = xstrdup(*av); |
bfe49944 | 546 | cp = strrchr(p, '@'); |
3c0ef626 | 547 | if (cp == NULL || cp == p) |
548 | usage(); | |
549 | options.user = p; | |
550 | *cp = '\0'; | |
551 | host = ++cp; | |
552 | } else | |
553 | host = *av; | |
bfe49944 | 554 | if (ac > 1) { |
555 | optind = optreset = 1; | |
3c0ef626 | 556 | goto again; |
557 | } | |
bfe49944 | 558 | ac--, av++; |
3c0ef626 | 559 | } |
560 | ||
561 | /* Check that we got a host name. */ | |
562 | if (!host) | |
563 | usage(); | |
564 | ||
565 | SSLeay_add_all_algorithms(); | |
566 | ERR_load_crypto_strings(); | |
3c0ef626 | 567 | |
568 | /* Initialize the command to execute on remote host. */ | |
569 | buffer_init(&command); | |
570 | ||
571 | /* | |
572 | * Save the command to execute on the remote host in a buffer. There | |
573 | * is no limit on the length of the command, except by the maximum | |
574 | * packet size. Also sets the tty flag if there is no command. | |
575 | */ | |
576 | if (!ac) { | |
577 | /* No command specified - execute shell on a tty. */ | |
578 | tty_flag = 1; | |
579 | if (subsystem_flag) { | |
580 | fprintf(stderr, | |
581 | "You must specify a subsystem to invoke.\n"); | |
582 | usage(); | |
583 | } | |
584 | } else { | |
585 | /* A command has been specified. Store it into the buffer. */ | |
586 | for (i = 0; i < ac; i++) { | |
587 | if (i) | |
588 | buffer_append(&command, " ", 1); | |
589 | buffer_append(&command, av[i], strlen(av[i])); | |
590 | } | |
591 | } | |
592 | ||
593 | /* Cannot fork to background if no command. */ | |
594 | if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag) | |
595 | fatal("Cannot fork into background without a command to execute."); | |
596 | ||
597 | /* Allocate a tty by default if no command specified. */ | |
598 | if (buffer_len(&command) == 0) | |
599 | tty_flag = 1; | |
600 | ||
d03f4262 | 601 | /* Force no tty */ |
3c0ef626 | 602 | if (no_tty_flag) |
603 | tty_flag = 0; | |
604 | /* Do not allocate a tty if stdin is not a tty. */ | |
2ce0bfe4 | 605 | if ((!isatty(fileno(stdin)) || stdin_null_flag) && !force_tty_flag) { |
3c0ef626 | 606 | if (tty_flag) |
7cac2b65 | 607 | logit("Pseudo-terminal will not be allocated because stdin is not a terminal."); |
3c0ef626 | 608 | tty_flag = 0; |
609 | } | |
610 | ||
611 | /* | |
612 | * Initialize "log" output. Since we are the client all output | |
613 | * actually goes to stderr. | |
614 | */ | |
615 | log_init(av[0], options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level, | |
616 | SYSLOG_FACILITY_USER, 1); | |
617 | ||
618 | /* | |
619 | * Read per-user configuration file. Ignore the system wide config | |
620 | * file if the user specifies a config file on the command line. | |
621 | */ | |
622 | if (config != NULL) { | |
7e82606e | 623 | if (!read_config_file(config, host, &options, 0)) |
3c0ef626 | 624 | fatal("Can't open user config file %.100s: " |
625 | "%.100s", config, strerror(errno)); | |
0b90ac93 | 626 | } else { |
c6046bb0 | 627 | /* |
628 | * Since the config file parsing code aborts if it sees | |
629 | * options it doesn't recognize, allow users to put | |
630 | * options specific to compile-time add-ons in alternate | |
631 | * config files so their primary config file will | |
632 | * interoperate SSH versions that don't support those | |
633 | * options. | |
634 | */ | |
635 | #ifdef GSSAPI | |
636 | snprintf(buf, sizeof buf, "%.100s/%.100s.gssapi", pw->pw_dir, | |
637 | _PATH_SSH_USER_CONFFILE); | |
7e82606e | 638 | (void)read_config_file(buf, host, &options, 1); |
c6046bb0 | 639 | #ifdef GSI |
640 | snprintf(buf, sizeof buf, "%.100s/%.100s.gsi", pw->pw_dir, | |
641 | _PATH_SSH_USER_CONFFILE); | |
7e82606e | 642 | (void)read_config_file(buf, host, &options, 1); |
c6046bb0 | 643 | #endif |
7cac2b65 | 644 | #if defined(KRB5) |
c6046bb0 | 645 | snprintf(buf, sizeof buf, "%.100s/%.100s.krb", pw->pw_dir, |
646 | _PATH_SSH_USER_CONFFILE); | |
7e82606e | 647 | (void)read_config_file(buf, host, &options, 1); |
c6046bb0 | 648 | #endif |
c6046bb0 | 649 | #endif |
3c0ef626 | 650 | snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, |
651 | _PATH_SSH_USER_CONFFILE); | |
7e82606e | 652 | (void)read_config_file(buf, host, &options, 1); |
3c0ef626 | 653 | |
654 | /* Read systemwide configuration file after use config. */ | |
7e82606e | 655 | (void)read_config_file(_PATH_HOST_CONFIG_FILE, host, |
656 | &options, 0); | |
3c0ef626 | 657 | } |
658 | ||
659 | /* Fill configuration defaults. */ | |
660 | fill_default_options(&options); | |
661 | ||
7cac2b65 | 662 | channel_set_af(options.address_family); |
663 | ||
3c0ef626 | 664 | /* reinit */ |
665 | log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 1); | |
666 | ||
667 | seed_rng(); | |
668 | ||
7cac2b65 | 669 | if (options.user == NULL) { |
670 | options.user = xstrdup(pw->pw_name); | |
671 | options.implicit = 1; | |
672 | } | |
73a68d83 | 673 | else options.implicit = 0; |
3c0ef626 | 674 | |
675 | if (options.hostname != NULL) | |
676 | host = options.hostname; | |
677 | ||
7cac2b65 | 678 | /* force lowercase for hostkey matching */ |
679 | if (options.host_key_alias != NULL) { | |
680 | for (p = options.host_key_alias; *p; p++) | |
681 | if (isupper(*p)) | |
30460aeb | 682 | *p = (char)tolower(*p); |
7cac2b65 | 683 | } |
684 | ||
2ce0bfe4 | 685 | /* Get default port if port has not been set. */ |
686 | if (options.port == 0) { | |
687 | sp = getservbyname(SSH_SERVICE_NAME, "tcp"); | |
688 | options.port = sp ? ntohs(sp->s_port) : SSH_DEFAULT_PORT; | |
689 | } | |
690 | ||
bfe49944 | 691 | if (options.proxy_command != NULL && |
e74dc197 | 692 | strcmp(options.proxy_command, "none") == 0) { |
693 | xfree(options.proxy_command); | |
bfe49944 | 694 | options.proxy_command = NULL; |
e74dc197 | 695 | } |
2ce0bfe4 | 696 | if (options.control_path != NULL && |
e74dc197 | 697 | strcmp(options.control_path, "none") == 0) { |
698 | xfree(options.control_path); | |
2ce0bfe4 | 699 | options.control_path = NULL; |
e74dc197 | 700 | } |
bfe49944 | 701 | |
7e82606e | 702 | if (options.control_path != NULL) { |
30460aeb | 703 | char thishost[NI_MAXHOST]; |
704 | ||
705 | if (gethostname(thishost, sizeof(thishost)) == -1) | |
706 | fatal("gethostname: %s", strerror(errno)); | |
2ce0bfe4 | 707 | snprintf(buf, sizeof(buf), "%d", options.port); |
708 | cp = tilde_expand_filename(options.control_path, | |
709 | original_real_uid); | |
e74dc197 | 710 | xfree(options.control_path); |
2ce0bfe4 | 711 | options.control_path = percent_expand(cp, "p", buf, "h", host, |
30460aeb | 712 | "r", options.user, "l", thishost, (char *)NULL); |
2ce0bfe4 | 713 | xfree(cp); |
7e82606e | 714 | } |
2ce0bfe4 | 715 | if (mux_command != 0 && options.control_path == NULL) |
716 | fatal("No ControlPath specified for \"-O\" command"); | |
717 | if (options.control_path != NULL) | |
718 | control_client(options.control_path); | |
7e82606e | 719 | |
e74dc197 | 720 | timeout_ms = options.connection_timeout * 1000; |
721 | ||
3c0ef626 | 722 | /* Open a connection to the remote host. */ |
7cac2b65 | 723 | if (ssh_connect(host, &hostaddr, options.port, |
e74dc197 | 724 | options.address_family, options.connection_attempts, &timeout_ms, |
725 | options.tcp_keep_alive, | |
44a053a3 | 726 | #ifdef HAVE_CYGWIN |
727 | options.use_privileged_port, | |
728 | #else | |
729 | original_effective_uid == 0 && options.use_privileged_port, | |
730 | #endif | |
731 | options.proxy_command) != 0) | |
08822d99 | 732 | exit(255); |
3c0ef626 | 733 | |
e74dc197 | 734 | if (timeout_ms > 0) |
735 | debug3("timeout: %d ms remain after connect", timeout_ms); | |
736 | ||
3c0ef626 | 737 | /* |
738 | * If we successfully made the connection, load the host private key | |
739 | * in case we will need it later for combined rsa-rhosts | |
740 | * authentication. This must be done before releasing extra | |
741 | * privileges, because the file is only readable by root. | |
44a053a3 | 742 | * If we cannot access the private keys, load the public keys |
743 | * instead and try to execute the ssh-keysign helper instead. | |
3c0ef626 | 744 | */ |
745 | sensitive_data.nkeys = 0; | |
746 | sensitive_data.keys = NULL; | |
44a053a3 | 747 | sensitive_data.external_keysign = 0; |
748 | if (options.rhosts_rsa_authentication || | |
749 | options.hostbased_authentication) { | |
3c0ef626 | 750 | sensitive_data.nkeys = 3; |
30460aeb | 751 | sensitive_data.keys = xcalloc(sensitive_data.nkeys, |
d03f4262 | 752 | sizeof(Key)); |
44a053a3 | 753 | |
754 | PRIV_START; | |
3c0ef626 | 755 | sensitive_data.keys[0] = key_load_private_type(KEY_RSA1, |
30460aeb | 756 | _PATH_HOST_KEY_FILE, "", NULL, NULL); |
3c0ef626 | 757 | sensitive_data.keys[1] = key_load_private_type(KEY_DSA, |
30460aeb | 758 | _PATH_HOST_DSA_KEY_FILE, "", NULL, NULL); |
3c0ef626 | 759 | sensitive_data.keys[2] = key_load_private_type(KEY_RSA, |
30460aeb | 760 | _PATH_HOST_RSA_KEY_FILE, "", NULL, NULL); |
44a053a3 | 761 | PRIV_END; |
762 | ||
d03f4262 | 763 | if (options.hostbased_authentication == 1 && |
764 | sensitive_data.keys[0] == NULL && | |
44a053a3 | 765 | sensitive_data.keys[1] == NULL && |
766 | sensitive_data.keys[2] == NULL) { | |
767 | sensitive_data.keys[1] = key_load_public( | |
768 | _PATH_HOST_DSA_KEY_FILE, NULL); | |
769 | sensitive_data.keys[2] = key_load_public( | |
770 | _PATH_HOST_RSA_KEY_FILE, NULL); | |
771 | sensitive_data.external_keysign = 1; | |
772 | } | |
3c0ef626 | 773 | } |
774 | /* | |
775 | * Get rid of any extra privileges that we may have. We will no | |
776 | * longer need them. Also, extra privileges could make it very hard | |
777 | * to read identity files and other non-world-readable files from the | |
778 | * user's home directory if it happens to be on a NFS volume where | |
779 | * root is mapped to nobody. | |
780 | */ | |
7e82606e | 781 | if (original_effective_uid == 0) { |
782 | PRIV_START; | |
783 | permanently_set_uid(pw); | |
784 | } | |
3c0ef626 | 785 | |
786 | /* | |
787 | * Now that we are back to our own permissions, create ~/.ssh | |
08822d99 | 788 | * directory if it doesn't already exist. |
3c0ef626 | 789 | */ |
790 | snprintf(buf, sizeof buf, "%.100s%s%.100s", pw->pw_dir, strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR); | |
791 | if (stat(buf, &st) < 0) | |
792 | if (mkdir(buf, 0700) < 0) | |
793 | error("Could not create directory '%.200s'.", buf); | |
794 | ||
3c0ef626 | 795 | /* load options.identity_files */ |
796 | load_public_identity_files(); | |
797 | ||
798 | /* Expand ~ in known host file names. */ | |
799 | /* XXX mem-leaks: */ | |
800 | options.system_hostfile = | |
801 | tilde_expand_filename(options.system_hostfile, original_real_uid); | |
802 | options.user_hostfile = | |
803 | tilde_expand_filename(options.user_hostfile, original_real_uid); | |
804 | options.system_hostfile2 = | |
805 | tilde_expand_filename(options.system_hostfile2, original_real_uid); | |
806 | options.user_hostfile2 = | |
807 | tilde_expand_filename(options.user_hostfile2, original_real_uid); | |
808 | ||
809 | signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */ | |
810 | ||
811 | /* Log into the remote system. This never returns if the login fails. */ | |
e74dc197 | 812 | ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr, |
813 | pw, timeout_ms); | |
3c0ef626 | 814 | |
815 | /* We no longer need the private host keys. Clear them now. */ | |
816 | if (sensitive_data.nkeys != 0) { | |
817 | for (i = 0; i < sensitive_data.nkeys; i++) { | |
818 | if (sensitive_data.keys[i] != NULL) { | |
819 | /* Destroys contents safely */ | |
820 | debug3("clear hostkey %d", i); | |
821 | key_free(sensitive_data.keys[i]); | |
822 | sensitive_data.keys[i] = NULL; | |
823 | } | |
824 | } | |
825 | xfree(sensitive_data.keys); | |
826 | } | |
827 | for (i = 0; i < options.num_identity_files; i++) { | |
828 | if (options.identity_files[i]) { | |
829 | xfree(options.identity_files[i]); | |
830 | options.identity_files[i] = NULL; | |
831 | } | |
832 | if (options.identity_keys[i]) { | |
833 | key_free(options.identity_keys[i]); | |
834 | options.identity_keys[i] = NULL; | |
835 | } | |
836 | } | |
837 | ||
838 | exit_status = compat20 ? ssh_session2() : ssh_session(); | |
839 | packet_close(); | |
d03f4262 | 840 | |
7e82606e | 841 | if (options.control_path != NULL && control_fd != -1) |
842 | unlink(options.control_path); | |
843 | ||
d03f4262 | 844 | /* |
540d72c3 | 845 | * Send SIGHUP to proxy command if used. We don't wait() in |
d03f4262 | 846 | * case it hangs and instead rely on init to reap the child |
847 | */ | |
848 | if (proxy_command_pid > 1) | |
849 | kill(proxy_command_pid, SIGHUP); | |
850 | ||
3c0ef626 | 851 | return exit_status; |
852 | } | |
853 | ||
3c0ef626 | 854 | static void |
855 | ssh_init_forwarding(void) | |
856 | { | |
857 | int success = 0; | |
858 | int i; | |
859 | ||
860 | /* Initiate local TCP/IP port forwardings. */ | |
861 | for (i = 0; i < options.num_local_forwards; i++) { | |
dfddba3d | 862 | debug("Local connections to %.200s:%d forwarded to remote " |
863 | "address %.200s:%d", | |
8b32eddc | 864 | (options.local_forwards[i].listen_host == NULL) ? |
865 | (options.gateway_ports ? "*" : "LOCALHOST") : | |
dfddba3d | 866 | options.local_forwards[i].listen_host, |
867 | options.local_forwards[i].listen_port, | |
868 | options.local_forwards[i].connect_host, | |
869 | options.local_forwards[i].connect_port); | |
c6046bb0 | 870 | success += channel_setup_local_fwd_listener( |
dfddba3d | 871 | options.local_forwards[i].listen_host, |
872 | options.local_forwards[i].listen_port, | |
873 | options.local_forwards[i].connect_host, | |
874 | options.local_forwards[i].connect_port, | |
a7213e65 | 875 | options.gateway_ports, options.hpn_disabled, |
876 | options.hpn_buffer_size); | |
3c0ef626 | 877 | } |
30460aeb | 878 | if (i > 0 && success != i && options.exit_on_forward_failure) |
879 | fatal("Could not request local forwarding."); | |
3c0ef626 | 880 | if (i > 0 && success == 0) |
881 | error("Could not request local forwarding."); | |
882 | ||
883 | /* Initiate remote TCP/IP port forwardings. */ | |
884 | for (i = 0; i < options.num_remote_forwards; i++) { | |
dfddba3d | 885 | debug("Remote connections from %.200s:%d forwarded to " |
886 | "local address %.200s:%d", | |
2ce0bfe4 | 887 | (options.remote_forwards[i].listen_host == NULL) ? |
08822d99 | 888 | "LOCALHOST" : options.remote_forwards[i].listen_host, |
dfddba3d | 889 | options.remote_forwards[i].listen_port, |
890 | options.remote_forwards[i].connect_host, | |
891 | options.remote_forwards[i].connect_port); | |
30460aeb | 892 | if (channel_request_remote_forwarding( |
dfddba3d | 893 | options.remote_forwards[i].listen_host, |
894 | options.remote_forwards[i].listen_port, | |
895 | options.remote_forwards[i].connect_host, | |
30460aeb | 896 | options.remote_forwards[i].connect_port) < 0) { |
897 | if (options.exit_on_forward_failure) | |
898 | fatal("Could not request remote forwarding."); | |
899 | else | |
900 | logit("Warning: Could not request remote " | |
901 | "forwarding."); | |
902 | } | |
3c0ef626 | 903 | } |
fa0f0f45 | 904 | |
905 | /* Initiate tunnel forwarding. */ | |
906 | if (options.tun_open != SSH_TUNMODE_NO) { | |
907 | if (client_request_tun_fwd(options.tun_open, | |
908 | options.tun_local, options.tun_remote) == -1) { | |
909 | if (options.exit_on_forward_failure) | |
910 | fatal("Could not request tunnel forwarding."); | |
911 | else | |
912 | error("Could not request tunnel forwarding."); | |
913 | } | |
914 | } | |
3c0ef626 | 915 | } |
916 | ||
917 | static void | |
918 | check_agent_present(void) | |
919 | { | |
920 | if (options.forward_agent) { | |
08822d99 | 921 | /* Clear agent forwarding if we don't have an agent. */ |
d03f4262 | 922 | if (!ssh_agent_present()) |
3c0ef626 | 923 | options.forward_agent = 0; |
3c0ef626 | 924 | } |
925 | } | |
926 | ||
927 | static int | |
928 | ssh_session(void) | |
929 | { | |
930 | int type; | |
3c0ef626 | 931 | int interactive = 0; |
932 | int have_tty = 0; | |
933 | struct winsize ws; | |
934 | char *cp; | |
2ce0bfe4 | 935 | const char *display; |
3c0ef626 | 936 | |
937 | /* Enable compression if requested. */ | |
938 | if (options.compression) { | |
939 | debug("Requesting compression at level %d.", options.compression_level); | |
940 | ||
941 | if (options.compression_level < 1 || options.compression_level > 9) | |
942 | fatal("Compression level must be from 1 (fast) to 9 (slow, best)."); | |
943 | ||
944 | /* Send the request. */ | |
945 | packet_start(SSH_CMSG_REQUEST_COMPRESSION); | |
946 | packet_put_int(options.compression_level); | |
947 | packet_send(); | |
948 | packet_write_wait(); | |
c6046bb0 | 949 | type = packet_read(); |
3c0ef626 | 950 | if (type == SSH_SMSG_SUCCESS) |
951 | packet_start_compression(options.compression_level); | |
952 | else if (type == SSH_SMSG_FAILURE) | |
7cac2b65 | 953 | logit("Warning: Remote host refused compression."); |
3c0ef626 | 954 | else |
955 | packet_disconnect("Protocol error waiting for compression response."); | |
956 | } | |
957 | /* Allocate a pseudo tty if appropriate. */ | |
958 | if (tty_flag) { | |
959 | debug("Requesting pty."); | |
960 | ||
961 | /* Start the packet. */ | |
962 | packet_start(SSH_CMSG_REQUEST_PTY); | |
963 | ||
964 | /* Store TERM in the packet. There is no limit on the | |
965 | length of the string. */ | |
966 | cp = getenv("TERM"); | |
967 | if (!cp) | |
968 | cp = ""; | |
969 | packet_put_cstring(cp); | |
970 | ||
971 | /* Store window size in the packet. */ | |
972 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) | |
973 | memset(&ws, 0, sizeof(ws)); | |
30460aeb | 974 | packet_put_int((u_int)ws.ws_row); |
975 | packet_put_int((u_int)ws.ws_col); | |
976 | packet_put_int((u_int)ws.ws_xpixel); | |
977 | packet_put_int((u_int)ws.ws_ypixel); | |
3c0ef626 | 978 | |
979 | /* Store tty modes in the packet. */ | |
980 | tty_make_modes(fileno(stdin), NULL); | |
981 | ||
982 | /* Send the packet, and wait for it to leave. */ | |
983 | packet_send(); | |
984 | packet_write_wait(); | |
985 | ||
986 | /* Read response from the server. */ | |
c6046bb0 | 987 | type = packet_read(); |
3c0ef626 | 988 | if (type == SSH_SMSG_SUCCESS) { |
989 | interactive = 1; | |
990 | have_tty = 1; | |
991 | } else if (type == SSH_SMSG_FAILURE) | |
7cac2b65 | 992 | logit("Warning: Remote host failed or refused to allocate a pseudo tty."); |
3c0ef626 | 993 | else |
994 | packet_disconnect("Protocol error waiting for pty request response."); | |
995 | } | |
996 | /* Request X11 forwarding if enabled and DISPLAY is set. */ | |
2ce0bfe4 | 997 | display = getenv("DISPLAY"); |
998 | if (options.forward_x11 && display != NULL) { | |
c6046bb0 | 999 | char *proto, *data; |
3c0ef626 | 1000 | /* Get reasonable local authentication information. */ |
2ce0bfe4 | 1001 | client_x11_get_proto(display, options.xauth_location, |
1002 | options.forward_x11_trusted, &proto, &data); | |
3c0ef626 | 1003 | /* Request forwarding with authentication spoofing. */ |
1004 | debug("Requesting X11 forwarding with authentication spoofing."); | |
2ce0bfe4 | 1005 | x11_request_forwarding_with_spoofing(0, display, proto, data); |
3c0ef626 | 1006 | |
1007 | /* Read response from the server. */ | |
c6046bb0 | 1008 | type = packet_read(); |
3c0ef626 | 1009 | if (type == SSH_SMSG_SUCCESS) { |
1010 | interactive = 1; | |
1011 | } else if (type == SSH_SMSG_FAILURE) { | |
7cac2b65 | 1012 | logit("Warning: Remote host denied X11 forwarding."); |
3c0ef626 | 1013 | } else { |
1014 | packet_disconnect("Protocol error waiting for X11 forwarding"); | |
1015 | } | |
1016 | } | |
1017 | /* Tell the packet module whether this is an interactive session. */ | |
1018 | packet_set_interactive(interactive); | |
1019 | ||
1020 | /* Request authentication agent forwarding if appropriate. */ | |
1021 | check_agent_present(); | |
1022 | ||
1023 | if (options.forward_agent) { | |
1024 | debug("Requesting authentication agent forwarding."); | |
1025 | auth_request_forwarding(); | |
1026 | ||
1027 | /* Read response from the server. */ | |
c6046bb0 | 1028 | type = packet_read(); |
1029 | packet_check_eom(); | |
3c0ef626 | 1030 | if (type != SSH_SMSG_SUCCESS) |
7cac2b65 | 1031 | logit("Warning: Remote host denied authentication agent forwarding."); |
3c0ef626 | 1032 | } |
1033 | ||
1034 | /* Initiate port forwardings. */ | |
1035 | ssh_init_forwarding(); | |
1036 | ||
e74dc197 | 1037 | /* Execute a local command */ |
1038 | if (options.local_command != NULL && | |
1039 | options.permit_local_command) | |
1040 | ssh_local_cmd(options.local_command); | |
1041 | ||
3c0ef626 | 1042 | /* If requested, let ssh continue in the background. */ |
1043 | if (fork_after_authentication_flag) | |
1044 | if (daemon(1, 1) < 0) | |
1045 | fatal("daemon() failed: %.200s", strerror(errno)); | |
1046 | ||
1047 | /* | |
1048 | * If a command was specified on the command line, execute the | |
1049 | * command now. Otherwise request the server to start a shell. | |
1050 | */ | |
1051 | if (buffer_len(&command) > 0) { | |
1052 | int len = buffer_len(&command); | |
1053 | if (len > 900) | |
1054 | len = 900; | |
c6046bb0 | 1055 | debug("Sending command: %.*s", len, (u_char *)buffer_ptr(&command)); |
3c0ef626 | 1056 | packet_start(SSH_CMSG_EXEC_CMD); |
1057 | packet_put_string(buffer_ptr(&command), buffer_len(&command)); | |
1058 | packet_send(); | |
1059 | packet_write_wait(); | |
1060 | } else { | |
1061 | debug("Requesting shell."); | |
1062 | packet_start(SSH_CMSG_EXEC_SHELL); | |
1063 | packet_send(); | |
1064 | packet_write_wait(); | |
1065 | } | |
1066 | ||
1067 | /* Enter the interactive session. */ | |
1068 | return client_loop(have_tty, tty_flag ? | |
1069 | options.escape_char : SSH_ESCAPECHAR_NONE, 0); | |
1070 | } | |
1071 | ||
1072 | static void | |
7e82606e | 1073 | ssh_subsystem_reply(int type, u_int32_t seq, void *ctxt) |
3c0ef626 | 1074 | { |
1075 | int id, len; | |
1076 | ||
1077 | id = packet_get_int(); | |
1078 | len = buffer_len(&command); | |
1079 | if (len > 900) | |
1080 | len = 900; | |
c6046bb0 | 1081 | packet_check_eom(); |
3c0ef626 | 1082 | if (type == SSH2_MSG_CHANNEL_FAILURE) |
1083 | fatal("Request for subsystem '%.*s' failed on channel %d", | |
c6046bb0 | 1084 | len, (u_char *)buffer_ptr(&command), id); |
1085 | } | |
1086 | ||
1087 | void | |
540d72c3 | 1088 | client_global_request_reply_fwd(int type, u_int32_t seq, void *ctxt) |
c6046bb0 | 1089 | { |
1090 | int i; | |
1091 | ||
1092 | i = client_global_request_id++; | |
540d72c3 | 1093 | if (i >= options.num_remote_forwards) |
c6046bb0 | 1094 | return; |
c6046bb0 | 1095 | debug("remote forward %s for: listen %d, connect %s:%d", |
1096 | type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure", | |
dfddba3d | 1097 | options.remote_forwards[i].listen_port, |
1098 | options.remote_forwards[i].connect_host, | |
1099 | options.remote_forwards[i].connect_port); | |
30460aeb | 1100 | if (type == SSH2_MSG_REQUEST_FAILURE) { |
1101 | if (options.exit_on_forward_failure) | |
1102 | fatal("Error: remote port forwarding failed for " | |
1103 | "listen port %d", | |
1104 | options.remote_forwards[i].listen_port); | |
1105 | else | |
1106 | logit("Warning: remote port forwarding failed for " | |
1107 | "listen port %d", | |
1108 | options.remote_forwards[i].listen_port); | |
1109 | } | |
3c0ef626 | 1110 | } |
1111 | ||
3c0ef626 | 1112 | static void |
7e82606e | 1113 | ssh_control_listener(void) |
3c0ef626 | 1114 | { |
7e82606e | 1115 | struct sockaddr_un addr; |
1116 | mode_t old_umask; | |
1117 | int addr_len; | |
3c0ef626 | 1118 | |
2ce0bfe4 | 1119 | if (options.control_path == NULL || |
1120 | options.control_master == SSHCTL_MASTER_NO) | |
7e82606e | 1121 | return; |
3c0ef626 | 1122 | |
2ce0bfe4 | 1123 | debug("setting up multiplex master socket"); |
1124 | ||
7e82606e | 1125 | memset(&addr, '\0', sizeof(addr)); |
1126 | addr.sun_family = AF_UNIX; | |
1127 | addr_len = offsetof(struct sockaddr_un, sun_path) + | |
1128 | strlen(options.control_path) + 1; | |
3c0ef626 | 1129 | |
7e82606e | 1130 | if (strlcpy(addr.sun_path, options.control_path, |
1131 | sizeof(addr.sun_path)) >= sizeof(addr.sun_path)) | |
1132 | fatal("ControlPath too long"); | |
1133 | ||
1134 | if ((control_fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) | |
08822d99 | 1135 | fatal("%s socket(): %s", __func__, strerror(errno)); |
7e82606e | 1136 | |
1137 | old_umask = umask(0177); | |
30460aeb | 1138 | if (bind(control_fd, (struct sockaddr *)&addr, addr_len) == -1) { |
7e82606e | 1139 | control_fd = -1; |
8b32eddc | 1140 | if (errno == EINVAL || errno == EADDRINUSE) |
7e82606e | 1141 | fatal("ControlSocket %s already exists", |
1142 | options.control_path); | |
1143 | else | |
08822d99 | 1144 | fatal("%s bind(): %s", __func__, strerror(errno)); |
3c0ef626 | 1145 | } |
7e82606e | 1146 | umask(old_umask); |
1147 | ||
1148 | if (listen(control_fd, 64) == -1) | |
08822d99 | 1149 | fatal("%s listen(): %s", __func__, strerror(errno)); |
7e82606e | 1150 | |
1151 | set_nonblock(control_fd); | |
1152 | } | |
1153 | ||
1154 | /* request pty/x11/agent/tcpfwd/shell for channel */ | |
1155 | static void | |
1156 | ssh_session2_setup(int id, void *arg) | |
1157 | { | |
1158 | extern char **environ; | |
2ce0bfe4 | 1159 | const char *display; |
7e82606e | 1160 | int interactive = tty_flag; |
2ce0bfe4 | 1161 | |
1162 | display = getenv("DISPLAY"); | |
1163 | if (options.forward_x11 && display != NULL) { | |
c6046bb0 | 1164 | char *proto, *data; |
3c0ef626 | 1165 | /* Get reasonable local authentication information. */ |
2ce0bfe4 | 1166 | client_x11_get_proto(display, options.xauth_location, |
1167 | options.forward_x11_trusted, &proto, &data); | |
3c0ef626 | 1168 | /* Request forwarding with authentication spoofing. */ |
1169 | debug("Requesting X11 forwarding with authentication spoofing."); | |
2ce0bfe4 | 1170 | x11_request_forwarding_with_spoofing(id, display, proto, data); |
3c0ef626 | 1171 | interactive = 1; |
1172 | /* XXX wait for reply */ | |
1173 | } | |
1174 | ||
1175 | check_agent_present(); | |
1176 | if (options.forward_agent) { | |
1177 | debug("Requesting authentication agent forwarding."); | |
1178 | channel_request_start(id, "auth-agent-req@openssh.com", 0); | |
1179 | packet_send(); | |
1180 | } | |
1181 | ||
7e82606e | 1182 | client_session2_setup(id, tty_flag, subsystem_flag, getenv("TERM"), |
1183 | NULL, fileno(stdin), &command, environ, &ssh_subsystem_reply); | |
3c0ef626 | 1184 | |
3c0ef626 | 1185 | packet_set_interactive(interactive); |
1186 | } | |
1187 | ||
1188 | /* open new channel for a session */ | |
1189 | static int | |
1190 | ssh_session2_open(void) | |
1191 | { | |
1192 | Channel *c; | |
1193 | int window, packetmax, in, out, err; | |
f713db99 | 1194 | int sock; |
1195 | int socksize; | |
1196 | int socksizelen = sizeof(int); | |
3c0ef626 | 1197 | |
1198 | if (stdin_null_flag) { | |
1199 | in = open(_PATH_DEVNULL, O_RDONLY); | |
1200 | } else { | |
1201 | in = dup(STDIN_FILENO); | |
1202 | } | |
1203 | out = dup(STDOUT_FILENO); | |
1204 | err = dup(STDERR_FILENO); | |
1205 | ||
1206 | if (in < 0 || out < 0 || err < 0) | |
1207 | fatal("dup() in/out/err failed"); | |
1208 | ||
1209 | /* enable nonblocking unless tty */ | |
1210 | if (!isatty(in)) | |
1211 | set_nonblock(in); | |
1212 | if (!isatty(out)) | |
1213 | set_nonblock(out); | |
1214 | if (!isatty(err)) | |
1215 | set_nonblock(err); | |
1216 | ||
f713db99 | 1217 | /* we need to check to see if what they want to do about buffer */ |
1218 | /* sizes here. In a hpn to nonhpn connection we want to limit */ | |
1219 | /* the window size to something reasonable in case the far side */ | |
1220 | /* has the large window bug. In hpn to hpn connection we want to */ | |
1221 | /* use the max window size but allow the user to override it */ | |
1222 | /* lastly if they disabled hpn then use the ssh std window size */ | |
1223 | ||
1224 | /* so why don't we just do a getsockopt() here and set the */ | |
1225 | /* ssh window to that? In the case of a autotuning receive */ | |
1226 | /* window the window would get stuck at the initial buffer */ | |
1227 | /* size generally less than 96k. Therefore we need to set the */ | |
1228 | /* maximum ssh window size to the maximum hpn buffer size */ | |
6df46d40 | 1229 | /* unless the user has specifically set the tcprcvbufpoll */ |
f713db99 | 1230 | /* to no. In which case we *can* just set the window to the */ |
1231 | /* minimum of the hpn buffer size and tcp receive buffer size */ | |
1232 | ||
a7213e65 | 1233 | if(options.hpn_disabled) |
f713db99 | 1234 | { |
1235 | options.hpn_buffer_size = CHAN_SES_WINDOW_DEFAULT; | |
1236 | } | |
1237 | else if (datafellows & SSH_BUG_LARGEWINDOW) | |
1238 | { | |
1239 | debug("HPN to Non-HPN Connection"); | |
1240 | if (options.hpn_buffer_size < 0) | |
1241 | options.hpn_buffer_size = 2*1024*1024; | |
1242 | } | |
1243 | else | |
1244 | { | |
1245 | if (options.hpn_buffer_size < 0) | |
1246 | options.hpn_buffer_size = BUFFER_MAX_LEN_HPN; | |
2d7c038e | 1247 | |
1248 | /*create a socket but don't connect it */ | |
1249 | /* we use that the get the rcv socket size */ | |
1250 | sock = socket(AF_INET, SOCK_STREAM, 0); | |
1251 | /* if they are using the tcp_rcv_buf option */ | |
1252 | /* attempt to set the buffer size to that */ | |
1253 | if (options.tcp_rcv_buf) | |
1254 | setsockopt(sock, SOL_SOCKET, SO_RCVBUF, (void *)&options.tcp_rcv_buf, | |
1255 | sizeof(options.tcp_rcv_buf)); | |
1256 | getsockopt(sock, SOL_SOCKET, SO_RCVBUF, | |
1257 | &socksize, &socksizelen); | |
1258 | close(sock); | |
1259 | debug("socksize %d", socksize); | |
f713db99 | 1260 | if (options.tcp_rcv_buf_poll <= 0) |
1261 | { | |
2d7c038e | 1262 | options.hpn_buffer_size = MIN(socksize,options.hpn_buffer_size); |
1263 | debug ("MIN of TCP RWIN and HPNBufferSize: %d", options.hpn_buffer_size); | |
f713db99 | 1264 | } |
1265 | else | |
1266 | { | |
1267 | if (options.tcp_rcv_buf > 0) | |
1268 | options.hpn_buffer_size = MIN(options.tcp_rcv_buf, options.hpn_buffer_size); | |
2d7c038e | 1269 | debug ("MIN of TCPRcvBuf and HPNBufferSize: %d", options.hpn_buffer_size); |
f713db99 | 1270 | } |
1271 | ||
1272 | } | |
1273 | ||
1274 | debug("Final hpn_buffer_size = %d", options.hpn_buffer_size); | |
1275 | ||
1276 | window = options.hpn_buffer_size; | |
1277 | ||
3c0ef626 | 1278 | packetmax = CHAN_SES_PACKET_DEFAULT; |
c6046bb0 | 1279 | if (tty_flag) { |
473db5ab | 1280 | window = 4*CHAN_SES_PACKET_DEFAULT; |
c6046bb0 | 1281 | window >>= 1; |
1282 | packetmax >>= 1; | |
3c0ef626 | 1283 | } |
1284 | c = channel_new( | |
1285 | "session", SSH_CHANNEL_OPENING, in, out, err, | |
1286 | window, packetmax, CHAN_EXTENDED_WRITE, | |
7cac2b65 | 1287 | "client-session", /*nonblock*/0); |
4834571d | 1288 | |
a7213e65 | 1289 | if ((options.tcp_rcv_buf_poll > 0) && (!options.hpn_disabled)) { |
473db5ab | 1290 | c->dynamic_window = 1; |
a7213e65 | 1291 | debug ("Enabled Dynamic Window Scaling\n"); |
473db5ab | 1292 | } |
3c0ef626 | 1293 | debug3("ssh_session2_open: channel_new: %d", c->self); |
1294 | ||
1295 | channel_send_open(c->self); | |
1296 | if (!no_shell_flag) | |
7e82606e | 1297 | channel_register_confirm(c->self, ssh_session2_setup, NULL); |
3c0ef626 | 1298 | |
1299 | return c->self; | |
1300 | } | |
1301 | ||
1302 | static int | |
1303 | ssh_session2(void) | |
1304 | { | |
1305 | int id = -1; | |
1306 | ||
1307 | /* XXX should be pre-session */ | |
1308 | ssh_init_forwarding(); | |
1309 | ||
1310 | if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN)) | |
1311 | id = ssh_session2_open(); | |
1312 | ||
08822d99 | 1313 | /* Execute a local command */ |
1314 | if (options.local_command != NULL && | |
1315 | options.permit_local_command) | |
1316 | ssh_local_cmd(options.local_command); | |
1317 | ||
fa0f0f45 | 1318 | /* Start listening for multiplex clients */ |
1319 | ssh_control_listener(); | |
1320 | ||
3c0ef626 | 1321 | /* If requested, let ssh continue in the background. */ |
1322 | if (fork_after_authentication_flag) | |
1323 | if (daemon(1, 1) < 0) | |
1324 | fatal("daemon() failed: %.200s", strerror(errno)); | |
1325 | ||
1326 | return client_loop(tty_flag, tty_flag ? | |
1327 | options.escape_char : SSH_ESCAPECHAR_NONE, id); | |
1328 | } | |
1329 | ||
1330 | static void | |
1331 | load_public_identity_files(void) | |
1332 | { | |
30460aeb | 1333 | char *filename, *cp, thishost[NI_MAXHOST]; |
e74dc197 | 1334 | char *pwdir = NULL, *pwname = NULL; |
3c0ef626 | 1335 | int i = 0; |
c6046bb0 | 1336 | Key *public; |
30460aeb | 1337 | struct passwd *pw; |
3c0ef626 | 1338 | #ifdef SMARTCARD |
c6046bb0 | 1339 | Key **keys; |
1340 | ||
3c0ef626 | 1341 | if (options.smartcard_device != NULL && |
c6046bb0 | 1342 | options.num_identity_files < SSH_MAX_IDENTITY_FILES && |
30460aeb | 1343 | (keys = sc_get_keys(options.smartcard_device, NULL)) != NULL) { |
c6046bb0 | 1344 | int count = 0; |
1345 | for (i = 0; keys[i] != NULL; i++) { | |
1346 | count++; | |
1347 | memmove(&options.identity_files[1], &options.identity_files[0], | |
1348 | sizeof(char *) * (SSH_MAX_IDENTITY_FILES - 1)); | |
1349 | memmove(&options.identity_keys[1], &options.identity_keys[0], | |
1350 | sizeof(Key *) * (SSH_MAX_IDENTITY_FILES - 1)); | |
1351 | options.num_identity_files++; | |
1352 | options.identity_keys[0] = keys[i]; | |
7cac2b65 | 1353 | options.identity_files[0] = sc_get_key_label(keys[i]); |
c6046bb0 | 1354 | } |
1355 | if (options.num_identity_files > SSH_MAX_IDENTITY_FILES) | |
1356 | options.num_identity_files = SSH_MAX_IDENTITY_FILES; | |
1357 | i = count; | |
1358 | xfree(keys); | |
3c0ef626 | 1359 | } |
1360 | #endif /* SMARTCARD */ | |
30460aeb | 1361 | if ((pw = getpwuid(original_real_uid)) == NULL) |
1362 | fatal("load_public_identity_files: getpwuid failed"); | |
e74dc197 | 1363 | pwname = xstrdup(pw->pw_name); |
1364 | pwdir = xstrdup(pw->pw_dir); | |
30460aeb | 1365 | if (gethostname(thishost, sizeof(thishost)) == -1) |
1366 | fatal("load_public_identity_files: gethostname: %s", | |
1367 | strerror(errno)); | |
3c0ef626 | 1368 | for (; i < options.num_identity_files; i++) { |
30460aeb | 1369 | cp = tilde_expand_filename(options.identity_files[i], |
3c0ef626 | 1370 | original_real_uid); |
e74dc197 | 1371 | filename = percent_expand(cp, "d", pwdir, |
1372 | "u", pwname, "l", thishost, "h", host, | |
30460aeb | 1373 | "r", options.user, (char *)NULL); |
1374 | xfree(cp); | |
3c0ef626 | 1375 | public = key_load_public(filename, NULL); |
1376 | debug("identity file %s type %d", filename, | |
1377 | public ? public->type : -1); | |
1378 | xfree(options.identity_files[i]); | |
1379 | options.identity_files[i] = filename; | |
1380 | options.identity_keys[i] = public; | |
1381 | } | |
e74dc197 | 1382 | bzero(pwname, strlen(pwname)); |
1383 | xfree(pwname); | |
1384 | bzero(pwdir, strlen(pwdir)); | |
1385 | xfree(pwdir); | |
3c0ef626 | 1386 | } |
7e82606e | 1387 | |
1388 | static void | |
1389 | control_client_sighandler(int signo) | |
1390 | { | |
1391 | control_client_terminate = signo; | |
1392 | } | |
1393 | ||
1394 | static void | |
1395 | control_client_sigrelay(int signo) | |
1396 | { | |
e74dc197 | 1397 | int save_errno = errno; |
1398 | ||
7e82606e | 1399 | if (control_server_pid > 1) |
1400 | kill(control_server_pid, signo); | |
e74dc197 | 1401 | |
1402 | errno = save_errno; | |
7e82606e | 1403 | } |
1404 | ||
1405 | static int | |
1406 | env_permitted(char *env) | |
1407 | { | |
30460aeb | 1408 | int i, ret; |
7e82606e | 1409 | char name[1024], *cp; |
1410 | ||
30460aeb | 1411 | if ((cp = strchr(env, '=')) == NULL || cp == env) |
7e82606e | 1412 | return (0); |
30460aeb | 1413 | ret = snprintf(name, sizeof(name), "%.*s", (int)(cp - env), env); |
1414 | if (ret <= 0 || (size_t)ret >= sizeof(name)) | |
1415 | fatal("env_permitted: name '%.100s...' too long", env); | |
7e82606e | 1416 | |
1417 | for (i = 0; i < options.num_send_env; i++) | |
1418 | if (match_pattern(name, options.send_env[i])) | |
1419 | return (1); | |
1420 | ||
1421 | return (0); | |
1422 | } | |
1423 | ||
1424 | static void | |
1425 | control_client(const char *path) | |
1426 | { | |
1427 | struct sockaddr_un addr; | |
fa0f0f45 | 1428 | int i, r, fd, sock, exitval[2], num_env, addr_len; |
7e82606e | 1429 | Buffer m; |
dfddba3d | 1430 | char *term; |
7e82606e | 1431 | extern char **environ; |
dfddba3d | 1432 | u_int flags; |
1433 | ||
2ce0bfe4 | 1434 | if (mux_command == 0) |
1435 | mux_command = SSHMUX_COMMAND_OPEN; | |
1436 | ||
1437 | switch (options.control_master) { | |
1438 | case SSHCTL_MASTER_AUTO: | |
1439 | case SSHCTL_MASTER_AUTO_ASK: | |
1440 | debug("auto-mux: Trying existing master"); | |
1441 | /* FALLTHROUGH */ | |
1442 | case SSHCTL_MASTER_NO: | |
1443 | break; | |
1444 | default: | |
1445 | return; | |
dfddba3d | 1446 | } |
7e82606e | 1447 | |
1448 | memset(&addr, '\0', sizeof(addr)); | |
1449 | addr.sun_family = AF_UNIX; | |
1450 | addr_len = offsetof(struct sockaddr_un, sun_path) + | |
1451 | strlen(path) + 1; | |
1452 | ||
1453 | if (strlcpy(addr.sun_path, path, | |
1454 | sizeof(addr.sun_path)) >= sizeof(addr.sun_path)) | |
1455 | fatal("ControlPath too long"); | |
1456 | ||
1457 | if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) | |
1458 | fatal("%s socket(): %s", __func__, strerror(errno)); | |
1459 | ||
30460aeb | 1460 | if (connect(sock, (struct sockaddr *)&addr, addr_len) == -1) { |
2ce0bfe4 | 1461 | if (mux_command != SSHMUX_COMMAND_OPEN) { |
1462 | fatal("Control socket connect(%.100s): %s", path, | |
1463 | strerror(errno)); | |
1464 | } | |
1465 | if (errno == ENOENT) | |
30460aeb | 1466 | debug("Control socket \"%.100s\" does not exist", path); |
2ce0bfe4 | 1467 | else { |
30460aeb | 1468 | error("Control socket connect(%.100s): %s", path, |
2ce0bfe4 | 1469 | strerror(errno)); |
1470 | } | |
30460aeb | 1471 | close(sock); |
1472 | return; | |
1473 | } | |
1474 | ||
1475 | if (stdin_null_flag) { | |
1476 | if ((fd = open(_PATH_DEVNULL, O_RDONLY)) == -1) | |
1477 | fatal("open(/dev/null): %s", strerror(errno)); | |
1478 | if (dup2(fd, STDIN_FILENO) == -1) | |
1479 | fatal("dup2: %s", strerror(errno)); | |
1480 | if (fd > STDERR_FILENO) | |
1481 | close(fd); | |
1482 | } | |
7e82606e | 1483 | |
2ce0bfe4 | 1484 | term = getenv("TERM"); |
dfddba3d | 1485 | |
1486 | flags = 0; | |
1487 | if (tty_flag) | |
1488 | flags |= SSHMUX_FLAG_TTY; | |
1489 | if (subsystem_flag) | |
1490 | flags |= SSHMUX_FLAG_SUBSYS; | |
2ce0bfe4 | 1491 | if (options.forward_x11) |
1492 | flags |= SSHMUX_FLAG_X11_FWD; | |
1493 | if (options.forward_agent) | |
1494 | flags |= SSHMUX_FLAG_AGENT_FWD; | |
94e4c64d | 1495 | |
e74dc197 | 1496 | signal(SIGPIPE, SIG_IGN); |
1497 | ||
7e82606e | 1498 | buffer_init(&m); |
1499 | ||
dfddba3d | 1500 | /* Send our command to server */ |
1501 | buffer_put_int(&m, mux_command); | |
1502 | buffer_put_int(&m, flags); | |
2ce0bfe4 | 1503 | if (ssh_msg_send(sock, SSHMUX_VER, &m) == -1) |
dfddba3d | 1504 | fatal("%s: msg_send", __func__); |
1505 | buffer_clear(&m); | |
1506 | ||
1507 | /* Get authorisation status and PID of controlee */ | |
7e82606e | 1508 | if (ssh_msg_recv(sock, &m) == -1) |
1509 | fatal("%s: msg_recv", __func__); | |
2ce0bfe4 | 1510 | if (buffer_get_char(&m) != SSHMUX_VER) |
7e82606e | 1511 | fatal("%s: wrong version", __func__); |
7e82606e | 1512 | if (buffer_get_int(&m) != 1) |
1513 | fatal("Connection to master denied"); | |
1514 | control_server_pid = buffer_get_int(&m); | |
1515 | ||
1516 | buffer_clear(&m); | |
7e82606e | 1517 | |
dfddba3d | 1518 | switch (mux_command) { |
1519 | case SSHMUX_COMMAND_ALIVE_CHECK: | |
8b32eddc | 1520 | fprintf(stderr, "Master running (pid=%d)\r\n", |
dfddba3d | 1521 | control_server_pid); |
1522 | exit(0); | |
1523 | case SSHMUX_COMMAND_TERMINATE: | |
1524 | fprintf(stderr, "Exit request sent.\r\n"); | |
1525 | exit(0); | |
1526 | case SSHMUX_COMMAND_OPEN: | |
1527 | /* continue below */ | |
1528 | break; | |
1529 | default: | |
1530 | fatal("silly mux_command %d", mux_command); | |
1531 | } | |
1532 | ||
1533 | /* SSHMUX_COMMAND_OPEN */ | |
2ce0bfe4 | 1534 | buffer_put_cstring(&m, term ? term : ""); |
7e82606e | 1535 | buffer_append(&command, "\0", 1); |
1536 | buffer_put_cstring(&m, buffer_ptr(&command)); | |
1537 | ||
1538 | if (options.num_send_env == 0 || environ == NULL) { | |
1539 | buffer_put_int(&m, 0); | |
1540 | } else { | |
1541 | /* Pass environment */ | |
1542 | num_env = 0; | |
1543 | for (i = 0; environ[i] != NULL; i++) | |
1544 | if (env_permitted(environ[i])) | |
1545 | num_env++; /* Count */ | |
1546 | ||
1547 | buffer_put_int(&m, num_env); | |
1548 | ||
1549 | for (i = 0; environ[i] != NULL && num_env >= 0; i++) | |
1550 | if (env_permitted(environ[i])) { | |
1551 | num_env--; | |
1552 | buffer_put_cstring(&m, environ[i]); | |
1553 | } | |
1554 | } | |
1555 | ||
2ce0bfe4 | 1556 | if (ssh_msg_send(sock, SSHMUX_VER, &m) == -1) |
7e82606e | 1557 | fatal("%s: msg_send", __func__); |
1558 | ||
e74dc197 | 1559 | if (mm_send_fd(sock, STDIN_FILENO) == -1 || |
1560 | mm_send_fd(sock, STDOUT_FILENO) == -1 || | |
1561 | mm_send_fd(sock, STDERR_FILENO) == -1) | |
1562 | fatal("%s: send fds failed", __func__); | |
7e82606e | 1563 | |
1564 | /* Wait for reply, so master has a chance to gather ttymodes */ | |
1565 | buffer_clear(&m); | |
1566 | if (ssh_msg_recv(sock, &m) == -1) | |
1567 | fatal("%s: msg_recv", __func__); | |
2ce0bfe4 | 1568 | if (buffer_get_char(&m) != SSHMUX_VER) |
dfddba3d | 1569 | fatal("%s: wrong version", __func__); |
7e82606e | 1570 | buffer_free(&m); |
1571 | ||
dfddba3d | 1572 | signal(SIGHUP, control_client_sighandler); |
7e82606e | 1573 | signal(SIGINT, control_client_sighandler); |
1574 | signal(SIGTERM, control_client_sighandler); | |
1575 | signal(SIGWINCH, control_client_sigrelay); | |
1576 | ||
1577 | if (tty_flag) | |
1578 | enter_raw_mode(); | |
1579 | ||
fa0f0f45 | 1580 | /* |
1581 | * Stick around until the controlee closes the client_fd. | |
1582 | * Before it does, it is expected to write this process' exit | |
1583 | * value (one int). This process must read the value and wait for | |
1584 | * the closure of the client_fd; if this one closes early, the | |
1585 | * multiplex master will terminate early too (possibly losing data). | |
1586 | */ | |
1587 | exitval[0] = 0; | |
1588 | for (i = 0; !control_client_terminate && i < (int)sizeof(exitval);) { | |
1589 | r = read(sock, (char *)exitval + i, sizeof(exitval) - i); | |
7e82606e | 1590 | if (r == 0) { |
1591 | debug2("Received EOF from master"); | |
1592 | break; | |
1593 | } | |
fa0f0f45 | 1594 | if (r == -1) { |
1595 | if (errno == EINTR) | |
1596 | continue; | |
7e82606e | 1597 | fatal("%s: read %s", __func__, strerror(errno)); |
fa0f0f45 | 1598 | } |
1599 | i += r; | |
7e82606e | 1600 | } |
1601 | ||
7e82606e | 1602 | close(sock); |
7e82606e | 1603 | leave_raw_mode(); |
fa0f0f45 | 1604 | if (i > (int)sizeof(int)) |
1605 | fatal("%s: master returned too much data (%d > %lu)", | |
1606 | __func__, i, sizeof(int)); | |
1607 | if (control_client_terminate) { | |
1608 | debug2("Exiting on signal %d", control_client_terminate); | |
1609 | exitval[0] = 255; | |
1610 | } else if (i < (int)sizeof(int)) { | |
1611 | debug2("Control master terminated unexpectedly"); | |
1612 | exitval[0] = 255; | |
1613 | } else | |
1614 | debug2("Received exit status from master %d", exitval[0]); | |
7e82606e | 1615 | |
1616 | if (tty_flag && options.log_level != SYSLOG_LEVEL_QUIET) | |
fa0f0f45 | 1617 | fprintf(stderr, "Shared connection to %s closed.\r\n", host); |
7e82606e | 1618 | |
fa0f0f45 | 1619 | exit(exitval[0]); |
7e82606e | 1620 | } |