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2e437378 | 1 | /* $OpenBSD: ssh.c,v 1.294 2006/10/06 02:29:19 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. | |
416fd2a8 | 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" | |
2e437378 | 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> | |
75 | ||
2e437378 | 76 | #include "xmalloc.h" |
3c0ef626 | 77 | #include "ssh.h" |
78 | #include "ssh1.h" | |
79 | #include "ssh2.h" | |
80 | #include "compat.h" | |
81 | #include "cipher.h" | |
3c0ef626 | 82 | #include "packet.h" |
83 | #include "buffer.h" | |
3c0ef626 | 84 | #include "channels.h" |
85 | #include "key.h" | |
86 | #include "authfd.h" | |
87 | #include "authfile.h" | |
88 | #include "pathnames.h" | |
1b56ff3d | 89 | #include "dispatch.h" |
3c0ef626 | 90 | #include "clientloop.h" |
91 | #include "log.h" | |
92 | #include "readconf.h" | |
93 | #include "sshconnect.h" | |
3c0ef626 | 94 | #include "misc.h" |
95 | #include "kex.h" | |
96 | #include "mac.h" | |
1b56ff3d | 97 | #include "sshpty.h" |
98 | #include "match.h" | |
99 | #include "msg.h" | |
100 | #include "monitor_fdpass.h" | |
101 | #include "uidswap.h" | |
2e437378 | 102 | #include "version.h" |
3c0ef626 | 103 | |
104 | #ifdef SMARTCARD | |
3c0ef626 | 105 | #include "scard.h" |
106 | #endif | |
107 | ||
3c0ef626 | 108 | extern char *__progname; |
3c0ef626 | 109 | |
3c0ef626 | 110 | /* Flag indicating whether debug mode is on. This can be set on the command line. */ |
111 | int debug_flag = 0; | |
112 | ||
113 | /* Flag indicating whether a tty should be allocated */ | |
114 | int tty_flag = 0; | |
115 | int no_tty_flag = 0; | |
116 | int force_tty_flag = 0; | |
117 | ||
118 | /* don't exec a shell */ | |
119 | int no_shell_flag = 0; | |
120 | ||
121 | /* | |
122 | * Flag indicating that nothing should be read from stdin. This can be set | |
123 | * on the command line. | |
124 | */ | |
125 | int stdin_null_flag = 0; | |
126 | ||
127 | /* | |
128 | * Flag indicating that ssh should fork after authentication. This is useful | |
ff2d7a98 | 129 | * so that the passphrase can be entered manually, and then ssh goes to the |
3c0ef626 | 130 | * background. |
131 | */ | |
132 | int fork_after_authentication_flag = 0; | |
133 | ||
134 | /* | |
135 | * General data structure for command line options and options configurable | |
136 | * in configuration files. See readconf.h. | |
137 | */ | |
138 | Options options; | |
139 | ||
140 | /* optional user configfile */ | |
141 | char *config = NULL; | |
142 | ||
143 | /* | |
144 | * Name of the host we are connecting to. This is the name given on the | |
145 | * command line, or the HostName specified for the user-supplied name in a | |
146 | * configuration file. | |
147 | */ | |
148 | char *host; | |
149 | ||
150 | /* socket address the host resolves to */ | |
151 | struct sockaddr_storage hostaddr; | |
152 | ||
153 | /* Private host keys. */ | |
ff2d7a98 | 154 | Sensitive sensitive_data; |
3c0ef626 | 155 | |
156 | /* Original real UID. */ | |
157 | uid_t original_real_uid; | |
ff2d7a98 | 158 | uid_t original_effective_uid; |
3c0ef626 | 159 | |
160 | /* command to be executed */ | |
161 | Buffer command; | |
162 | ||
163 | /* Should we execute a command or invoke a subsystem? */ | |
164 | int subsystem_flag = 0; | |
165 | ||
2980ea68 | 166 | /* # of replies received for global requests */ |
167 | static int client_global_request_id = 0; | |
168 | ||
e54b3d7c | 169 | /* pid of proxycommand child process */ |
170 | pid_t proxy_command_pid = 0; | |
171 | ||
1b56ff3d | 172 | /* fd to control socket */ |
173 | int control_fd = -1; | |
174 | ||
34fee935 | 175 | /* Multiplexing control command */ |
176 | static u_int mux_command = 0; | |
177 | ||
1b56ff3d | 178 | /* Only used in control client mode */ |
179 | volatile sig_atomic_t control_client_terminate = 0; | |
180 | u_int control_server_pid = 0; | |
181 | ||
3c0ef626 | 182 | /* Prints a help message to the user. This function never returns. */ |
183 | ||
184 | static void | |
185 | usage(void) | |
186 | { | |
2a304a95 | 187 | fprintf(stderr, |
34fee935 | 188 | "usage: ssh [-1246AaCfgkMNnqsTtVvXxY] [-b bind_address] [-c cipher_spec]\n" |
e00da40d | 189 | " [-D [bind_address:]port] [-e escape_char] [-F configfile]\n" |
34fee935 | 190 | " [-i identity_file] [-L [bind_address:]port:host:hostport]\n" |
191 | " [-l login_name] [-m mac_spec] [-O ctl_cmd] [-o option] [-p port]\n" | |
192 | " [-R [bind_address:]port:host:hostport] [-S ctl_path]\n" | |
2e437378 | 193 | " [-w local_tun[:remote_tun]] [user@]hostname [command]\n" |
2a304a95 | 194 | ); |
e00da40d | 195 | exit(255); |
3c0ef626 | 196 | } |
197 | ||
3c0ef626 | 198 | static int ssh_session(void); |
199 | static int ssh_session2(void); | |
200 | static void load_public_identity_files(void); | |
1b56ff3d | 201 | static void control_client(const char *path); |
3c0ef626 | 202 | |
203 | /* | |
204 | * Main program for the ssh client. | |
205 | */ | |
206 | int | |
207 | main(int ac, char **av) | |
208 | { | |
ff2d7a98 | 209 | int i, opt, exit_status; |
416fd2a8 | 210 | char *p, *cp, *line, buf[256]; |
3c0ef626 | 211 | struct stat st; |
212 | struct passwd *pw; | |
213 | int dummy; | |
3c0ef626 | 214 | extern int optind, optreset; |
215 | extern char *optarg; | |
34fee935 | 216 | struct servent *sp; |
217 | Forward fwd; | |
3c0ef626 | 218 | |
e00da40d | 219 | /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ |
220 | sanitise_stdfd(); | |
221 | ||
70791e56 | 222 | __progname = ssh_get_progname(av[0]); |
ae43c103 | 223 | init_pathnames(); |
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(); | |
416fd2a8 | 232 | |
e54b3d7c | 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) { | |
70791e56 | 254 | logit("You don't exist, go away!"); |
e00da40d | 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; | |
273 | ||
2e437378 | 274 | again: |
3c0ef626 | 275 | while ((opt = getopt(ac, av, |
e00da40d | 276 | "1246ab:c:e:fgi:kl:m:no:p:qstvxACD:F:I:L: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': | |
70791e56 | 285 | options.address_family = AF_INET; |
3c0ef626 | 286 | break; |
287 | case '6': | |
70791e56 | 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; | |
416fd2a8 | 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; | |
34fee935 | 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; | |
e54b3d7c | 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': |
416fd2a8 | 328 | options.gss_deleg_creds = 0; |
3c0ef626 | 329 | break; |
3c0ef626 | 330 | case 'i': |
331 | if (stat(optarg, &st) < 0) { | |
332 | fprintf(stderr, "Warning: Identity file %s " | |
34fee935 | 333 | "not accessible: %s.\n", optarg, |
334 | strerror(errno)); | |
3c0ef626 | 335 | break; |
336 | } | |
337 | if (options.num_identity_files >= | |
338 | SSH_MAX_IDENTITY_FILES) | |
339 | fatal("Too many identity files specified " | |
340 | "(max %d)", SSH_MAX_IDENTITY_FILES); | |
341 | options.identity_files[options.num_identity_files++] = | |
342 | xstrdup(optarg); | |
343 | break; | |
344 | case 'I': | |
345 | #ifdef SMARTCARD | |
346 | options.smartcard_device = xstrdup(optarg); | |
347 | #else | |
348 | fprintf(stderr, "no support for smartcards.\n"); | |
349 | #endif | |
350 | break; | |
351 | case 't': | |
352 | if (tty_flag) | |
353 | force_tty_flag = 1; | |
354 | tty_flag = 1; | |
355 | break; | |
356 | case 'v': | |
70791e56 | 357 | if (debug_flag == 0) { |
3c0ef626 | 358 | debug_flag = 1; |
359 | options.log_level = SYSLOG_LEVEL_DEBUG1; | |
70791e56 | 360 | } else { |
361 | if (options.log_level < SYSLOG_LEVEL_DEBUG3) | |
362 | options.log_level++; | |
3c0ef626 | 363 | break; |
70791e56 | 364 | } |
34fee935 | 365 | /* FALLTHROUGH */ |
3c0ef626 | 366 | case 'V': |
2a304a95 | 367 | fprintf(stderr, "%s, %s\n", |
34fee935 | 368 | SSH_RELEASE, SSLeay_version(SSLEAY_VERSION)); |
3c0ef626 | 369 | if (opt == 'V') |
370 | exit(0); | |
371 | break; | |
e00da40d | 372 | case 'w': |
373 | if (options.tun_open == -1) | |
374 | options.tun_open = SSH_TUNMODE_DEFAULT; | |
375 | options.tun_local = a2tun(optarg, &options.tun_remote); | |
376 | if (options.tun_local == SSH_TUNID_ERR) { | |
377 | fprintf(stderr, "Bad tun device '%s'\n", optarg); | |
378 | exit(255); | |
379 | } | |
380 | break; | |
3c0ef626 | 381 | case 'q': |
382 | options.log_level = SYSLOG_LEVEL_QUIET; | |
383 | break; | |
384 | case 'e': | |
385 | if (optarg[0] == '^' && optarg[2] == 0 && | |
386 | (u_char) optarg[1] >= 64 && | |
387 | (u_char) optarg[1] < 128) | |
388 | options.escape_char = (u_char) optarg[1] & 31; | |
389 | else if (strlen(optarg) == 1) | |
390 | options.escape_char = (u_char) optarg[0]; | |
391 | else if (strcmp(optarg, "none") == 0) | |
392 | options.escape_char = SSH_ESCAPECHAR_NONE; | |
393 | else { | |
394 | fprintf(stderr, "Bad escape character '%s'.\n", | |
395 | optarg); | |
e00da40d | 396 | exit(255); |
3c0ef626 | 397 | } |
398 | break; | |
399 | case 'c': | |
400 | if (ciphers_valid(optarg)) { | |
401 | /* SSH2 only */ | |
402 | options.ciphers = xstrdup(optarg); | |
1b56ff3d | 403 | options.cipher = SSH_CIPHER_INVALID; |
3c0ef626 | 404 | } else { |
405 | /* SSH1 only */ | |
406 | options.cipher = cipher_number(optarg); | |
407 | if (options.cipher == -1) { | |
408 | fprintf(stderr, | |
409 | "Unknown cipher type '%s'\n", | |
410 | optarg); | |
e00da40d | 411 | exit(255); |
3c0ef626 | 412 | } |
413 | if (options.cipher == SSH_CIPHER_3DES) | |
414 | options.ciphers = "3des-cbc"; | |
415 | else if (options.cipher == SSH_CIPHER_BLOWFISH) | |
416 | options.ciphers = "blowfish-cbc"; | |
417 | else | |
418 | options.ciphers = (char *)-1; | |
419 | } | |
420 | break; | |
421 | case 'm': | |
422 | if (mac_valid(optarg)) | |
423 | options.macs = xstrdup(optarg); | |
424 | else { | |
425 | fprintf(stderr, "Unknown mac type '%s'\n", | |
426 | optarg); | |
e00da40d | 427 | exit(255); |
3c0ef626 | 428 | } |
429 | break; | |
1b56ff3d | 430 | case 'M': |
34fee935 | 431 | if (options.control_master == SSHCTL_MASTER_YES) |
432 | options.control_master = SSHCTL_MASTER_ASK; | |
433 | else | |
434 | options.control_master = SSHCTL_MASTER_YES; | |
1b56ff3d | 435 | break; |
3c0ef626 | 436 | case 'p': |
437 | options.port = a2port(optarg); | |
438 | if (options.port == 0) { | |
439 | fprintf(stderr, "Bad port '%s'\n", optarg); | |
e00da40d | 440 | exit(255); |
3c0ef626 | 441 | } |
442 | break; | |
443 | case 'l': | |
444 | options.user = optarg; | |
445 | break; | |
446 | ||
447 | case 'L': | |
34fee935 | 448 | if (parse_forward(&fwd, optarg)) |
449 | add_local_forward(&options, &fwd); | |
450 | else { | |
3c0ef626 | 451 | fprintf(stderr, |
34fee935 | 452 | "Bad local forwarding specification '%s'\n", |
3c0ef626 | 453 | optarg); |
e00da40d | 454 | exit(255); |
3c0ef626 | 455 | } |
34fee935 | 456 | break; |
457 | ||
458 | case 'R': | |
459 | if (parse_forward(&fwd, optarg)) { | |
460 | add_remote_forward(&options, &fwd); | |
461 | } else { | |
3c0ef626 | 462 | fprintf(stderr, |
34fee935 | 463 | "Bad remote forwarding specification " |
464 | "'%s'\n", optarg); | |
e00da40d | 465 | exit(255); |
3c0ef626 | 466 | } |
3c0ef626 | 467 | break; |
468 | ||
469 | case 'D': | |
34fee935 | 470 | cp = p = xstrdup(optarg); |
471 | memset(&fwd, '\0', sizeof(fwd)); | |
472 | fwd.connect_host = "socks"; | |
473 | if ((fwd.listen_host = hpdelim(&cp)) == NULL) { | |
474 | fprintf(stderr, "Bad dynamic forwarding " | |
475 | "specification '%.100s'\n", optarg); | |
e00da40d | 476 | exit(255); |
34fee935 | 477 | } |
478 | if (cp != NULL) { | |
479 | fwd.listen_port = a2port(cp); | |
480 | fwd.listen_host = cleanhostname(fwd.listen_host); | |
481 | } else { | |
482 | fwd.listen_port = a2port(fwd.listen_host); | |
483 | fwd.listen_host = NULL; | |
484 | } | |
485 | ||
486 | if (fwd.listen_port == 0) { | |
3c0ef626 | 487 | fprintf(stderr, "Bad dynamic port '%s'\n", |
488 | optarg); | |
e00da40d | 489 | exit(255); |
3c0ef626 | 490 | } |
34fee935 | 491 | add_local_forward(&options, &fwd); |
492 | xfree(p); | |
3c0ef626 | 493 | break; |
494 | ||
495 | case 'C': | |
496 | options.compression = 1; | |
497 | break; | |
498 | case 'N': | |
499 | no_shell_flag = 1; | |
500 | no_tty_flag = 1; | |
3c0ef626 | 501 | break; |
502 | case 'o': | |
503 | dummy = 1; | |
416fd2a8 | 504 | line = xstrdup(optarg); |
3c0ef626 | 505 | if (process_config_line(&options, host ? host : "", |
416fd2a8 | 506 | line, "command-line", 0, &dummy) != 0) |
e00da40d | 507 | exit(255); |
416fd2a8 | 508 | xfree(line); |
3c0ef626 | 509 | break; |
2e437378 | 510 | case 'T': |
511 | no_tty_flag = 1; | |
512 | /* ensure that the user doesn't try to backdoor a */ | |
513 | /* null cipher switch on an interactive session */ | |
514 | /* so explicitly disable it no matter what */ | |
515 | options.none_switch=0; | |
516 | break; | |
3c0ef626 | 517 | case 's': |
518 | subsystem_flag = 1; | |
519 | break; | |
1b56ff3d | 520 | case 'S': |
521 | if (options.control_path != NULL) | |
522 | free(options.control_path); | |
523 | options.control_path = xstrdup(optarg); | |
524 | break; | |
3c0ef626 | 525 | case 'b': |
526 | options.bind_address = optarg; | |
527 | break; | |
528 | case 'F': | |
529 | config = optarg; | |
530 | break; | |
531 | default: | |
532 | usage(); | |
533 | } | |
534 | } | |
535 | ||
536 | ac -= optind; | |
537 | av += optind; | |
538 | ||
539 | if (ac > 0 && !host && **av != '-') { | |
1c14df9e | 540 | if (strrchr(*av, '@')) { |
3c0ef626 | 541 | p = xstrdup(*av); |
1c14df9e | 542 | cp = strrchr(p, '@'); |
3c0ef626 | 543 | if (cp == NULL || cp == p) |
544 | usage(); | |
545 | options.user = p; | |
546 | *cp = '\0'; | |
547 | host = ++cp; | |
548 | } else | |
549 | host = *av; | |
1c14df9e | 550 | if (ac > 1) { |
551 | optind = optreset = 1; | |
3c0ef626 | 552 | goto again; |
553 | } | |
1c14df9e | 554 | ac--, av++; |
3c0ef626 | 555 | } |
556 | ||
557 | /* Check that we got a host name. */ | |
558 | if (!host) | |
559 | usage(); | |
560 | ||
561 | SSLeay_add_all_algorithms(); | |
562 | ERR_load_crypto_strings(); | |
3c0ef626 | 563 | |
564 | /* Initialize the command to execute on remote host. */ | |
565 | buffer_init(&command); | |
566 | ||
567 | /* | |
568 | * Save the command to execute on the remote host in a buffer. There | |
569 | * is no limit on the length of the command, except by the maximum | |
570 | * packet size. Also sets the tty flag if there is no command. | |
571 | */ | |
572 | if (!ac) { | |
573 | /* No command specified - execute shell on a tty. */ | |
574 | tty_flag = 1; | |
575 | if (subsystem_flag) { | |
576 | fprintf(stderr, | |
577 | "You must specify a subsystem to invoke.\n"); | |
578 | usage(); | |
579 | } | |
580 | } else { | |
581 | /* A command has been specified. Store it into the buffer. */ | |
582 | for (i = 0; i < ac; i++) { | |
583 | if (i) | |
584 | buffer_append(&command, " ", 1); | |
585 | buffer_append(&command, av[i], strlen(av[i])); | |
586 | } | |
587 | } | |
588 | ||
589 | /* Cannot fork to background if no command. */ | |
590 | if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag) | |
591 | fatal("Cannot fork into background without a command to execute."); | |
592 | ||
593 | /* Allocate a tty by default if no command specified. */ | |
594 | if (buffer_len(&command) == 0) | |
595 | tty_flag = 1; | |
596 | ||
e54b3d7c | 597 | /* Force no tty */ |
3c0ef626 | 598 | if (no_tty_flag) |
599 | tty_flag = 0; | |
600 | /* Do not allocate a tty if stdin is not a tty. */ | |
34fee935 | 601 | if ((!isatty(fileno(stdin)) || stdin_null_flag) && !force_tty_flag) { |
3c0ef626 | 602 | if (tty_flag) |
70791e56 | 603 | logit("Pseudo-terminal will not be allocated because stdin is not a terminal."); |
3c0ef626 | 604 | tty_flag = 0; |
605 | } | |
606 | ||
607 | /* | |
608 | * Initialize "log" output. Since we are the client all output | |
609 | * actually goes to stderr. | |
610 | */ | |
611 | log_init(av[0], options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level, | |
612 | SYSLOG_FACILITY_USER, 1); | |
613 | ||
614 | /* | |
615 | * Read per-user configuration file. Ignore the system wide config | |
616 | * file if the user specifies a config file on the command line. | |
617 | */ | |
618 | if (config != NULL) { | |
1b56ff3d | 619 | if (!read_config_file(config, host, &options, 0)) |
3c0ef626 | 620 | fatal("Can't open user config file %.100s: " |
621 | "%.100s", config, strerror(errno)); | |
622 | } else { | |
078f71c2 | 623 | /* |
624 | * Since the config file parsing code aborts if it sees | |
625 | * options it doesn't recognize, allow users to put | |
626 | * options specific to compile-time add-ons in alternate | |
627 | * config files so their primary config file will | |
628 | * interoperate SSH versions that don't support those | |
629 | * options. | |
630 | */ | |
631 | #ifdef GSSAPI | |
632 | snprintf(buf, sizeof buf, "%.100s/%.100s.gssapi", pw->pw_dir, | |
633 | _PATH_SSH_USER_CONFFILE); | |
1b56ff3d | 634 | (void)read_config_file(buf, host, &options, 1); |
078f71c2 | 635 | #ifdef GSI |
636 | snprintf(buf, sizeof buf, "%.100s/%.100s.gsi", pw->pw_dir, | |
637 | _PATH_SSH_USER_CONFFILE); | |
1b56ff3d | 638 | (void)read_config_file(buf, host, &options, 1); |
078f71c2 | 639 | #endif |
70791e56 | 640 | #if defined(KRB5) |
078f71c2 | 641 | snprintf(buf, sizeof buf, "%.100s/%.100s.krb", pw->pw_dir, |
642 | _PATH_SSH_USER_CONFFILE); | |
1b56ff3d | 643 | (void)read_config_file(buf, host, &options, 1); |
078f71c2 | 644 | #endif |
078f71c2 | 645 | #endif |
3c0ef626 | 646 | snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, |
647 | _PATH_SSH_USER_CONFFILE); | |
1b56ff3d | 648 | (void)read_config_file(buf, host, &options, 1); |
3c0ef626 | 649 | |
650 | /* Read systemwide configuration file after use config. */ | |
1b56ff3d | 651 | (void)read_config_file(_PATH_HOST_CONFIG_FILE, host, |
652 | &options, 0); | |
3c0ef626 | 653 | } |
654 | ||
655 | /* Fill configuration defaults. */ | |
656 | fill_default_options(&options); | |
657 | ||
70791e56 | 658 | channel_set_af(options.address_family); |
659 | ||
3c0ef626 | 660 | /* reinit */ |
661 | log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 1); | |
662 | ||
663 | seed_rng(); | |
664 | ||
70791e56 | 665 | if (options.user == NULL) { |
666 | options.user = xstrdup(pw->pw_name); | |
667 | options.implicit = 1; | |
668 | } | |
2980ea68 | 669 | else options.implicit = 0; |
3c0ef626 | 670 | |
671 | if (options.hostname != NULL) | |
672 | host = options.hostname; | |
673 | ||
70791e56 | 674 | /* force lowercase for hostkey matching */ |
675 | if (options.host_key_alias != NULL) { | |
676 | for (p = options.host_key_alias; *p; p++) | |
677 | if (isupper(*p)) | |
2e437378 | 678 | *p = (char)tolower(*p); |
70791e56 | 679 | } |
680 | ||
34fee935 | 681 | /* Get default port if port has not been set. */ |
682 | if (options.port == 0) { | |
683 | sp = getservbyname(SSH_SERVICE_NAME, "tcp"); | |
684 | options.port = sp ? ntohs(sp->s_port) : SSH_DEFAULT_PORT; | |
685 | } | |
686 | ||
1c14df9e | 687 | if (options.proxy_command != NULL && |
688 | strcmp(options.proxy_command, "none") == 0) | |
689 | options.proxy_command = NULL; | |
34fee935 | 690 | if (options.control_path != NULL && |
691 | strcmp(options.control_path, "none") == 0) | |
692 | options.control_path = NULL; | |
1c14df9e | 693 | |
1b56ff3d | 694 | if (options.control_path != NULL) { |
2e437378 | 695 | char thishost[NI_MAXHOST]; |
696 | ||
697 | if (gethostname(thishost, sizeof(thishost)) == -1) | |
698 | fatal("gethostname: %s", strerror(errno)); | |
34fee935 | 699 | snprintf(buf, sizeof(buf), "%d", options.port); |
700 | cp = tilde_expand_filename(options.control_path, | |
701 | original_real_uid); | |
702 | options.control_path = percent_expand(cp, "p", buf, "h", host, | |
2e437378 | 703 | "r", options.user, "l", thishost, (char *)NULL); |
34fee935 | 704 | xfree(cp); |
1b56ff3d | 705 | } |
34fee935 | 706 | if (mux_command != 0 && options.control_path == NULL) |
707 | fatal("No ControlPath specified for \"-O\" command"); | |
708 | if (options.control_path != NULL) | |
709 | control_client(options.control_path); | |
1b56ff3d | 710 | |
3c0ef626 | 711 | /* Open a connection to the remote host. */ |
70791e56 | 712 | if (ssh_connect(host, &hostaddr, options.port, |
713 | options.address_family, options.connection_attempts, | |
ff2d7a98 | 714 | #ifdef HAVE_CYGWIN |
715 | options.use_privileged_port, | |
716 | #else | |
717 | original_effective_uid == 0 && options.use_privileged_port, | |
718 | #endif | |
719 | options.proxy_command) != 0) | |
e00da40d | 720 | exit(255); |
3c0ef626 | 721 | |
722 | /* | |
723 | * If we successfully made the connection, load the host private key | |
724 | * in case we will need it later for combined rsa-rhosts | |
725 | * authentication. This must be done before releasing extra | |
726 | * privileges, because the file is only readable by root. | |
ff2d7a98 | 727 | * If we cannot access the private keys, load the public keys |
728 | * instead and try to execute the ssh-keysign helper instead. | |
3c0ef626 | 729 | */ |
730 | sensitive_data.nkeys = 0; | |
731 | sensitive_data.keys = NULL; | |
ff2d7a98 | 732 | sensitive_data.external_keysign = 0; |
733 | if (options.rhosts_rsa_authentication || | |
734 | options.hostbased_authentication) { | |
3c0ef626 | 735 | sensitive_data.nkeys = 3; |
2e437378 | 736 | sensitive_data.keys = xcalloc(sensitive_data.nkeys, |
e54b3d7c | 737 | sizeof(Key)); |
ff2d7a98 | 738 | |
739 | PRIV_START; | |
3c0ef626 | 740 | sensitive_data.keys[0] = key_load_private_type(KEY_RSA1, |
2e437378 | 741 | _PATH_HOST_KEY_FILE, "", NULL, NULL); |
3c0ef626 | 742 | sensitive_data.keys[1] = key_load_private_type(KEY_DSA, |
2e437378 | 743 | _PATH_HOST_DSA_KEY_FILE, "", NULL, NULL); |
3c0ef626 | 744 | sensitive_data.keys[2] = key_load_private_type(KEY_RSA, |
2e437378 | 745 | _PATH_HOST_RSA_KEY_FILE, "", NULL, NULL); |
ff2d7a98 | 746 | PRIV_END; |
747 | ||
e54b3d7c | 748 | if (options.hostbased_authentication == 1 && |
749 | sensitive_data.keys[0] == NULL && | |
ff2d7a98 | 750 | sensitive_data.keys[1] == NULL && |
751 | sensitive_data.keys[2] == NULL) { | |
752 | sensitive_data.keys[1] = key_load_public( | |
753 | _PATH_HOST_DSA_KEY_FILE, NULL); | |
754 | sensitive_data.keys[2] = key_load_public( | |
755 | _PATH_HOST_RSA_KEY_FILE, NULL); | |
756 | sensitive_data.external_keysign = 1; | |
757 | } | |
3c0ef626 | 758 | } |
759 | /* | |
760 | * Get rid of any extra privileges that we may have. We will no | |
761 | * longer need them. Also, extra privileges could make it very hard | |
762 | * to read identity files and other non-world-readable files from the | |
763 | * user's home directory if it happens to be on a NFS volume where | |
764 | * root is mapped to nobody. | |
765 | */ | |
1b56ff3d | 766 | if (original_effective_uid == 0) { |
767 | PRIV_START; | |
768 | permanently_set_uid(pw); | |
769 | } | |
3c0ef626 | 770 | |
771 | /* | |
772 | * Now that we are back to our own permissions, create ~/.ssh | |
e00da40d | 773 | * directory if it doesn't already exist. |
3c0ef626 | 774 | */ |
775 | snprintf(buf, sizeof buf, "%.100s%s%.100s", pw->pw_dir, strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR); | |
776 | if (stat(buf, &st) < 0) | |
777 | if (mkdir(buf, 0700) < 0) | |
778 | error("Could not create directory '%.200s'.", buf); | |
779 | ||
3c0ef626 | 780 | /* load options.identity_files */ |
781 | load_public_identity_files(); | |
782 | ||
783 | /* Expand ~ in known host file names. */ | |
784 | /* XXX mem-leaks: */ | |
785 | options.system_hostfile = | |
786 | tilde_expand_filename(options.system_hostfile, original_real_uid); | |
787 | options.user_hostfile = | |
788 | tilde_expand_filename(options.user_hostfile, original_real_uid); | |
789 | options.system_hostfile2 = | |
790 | tilde_expand_filename(options.system_hostfile2, original_real_uid); | |
791 | options.user_hostfile2 = | |
792 | tilde_expand_filename(options.user_hostfile2, original_real_uid); | |
793 | ||
794 | signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */ | |
795 | ||
796 | /* Log into the remote system. This never returns if the login fails. */ | |
ff2d7a98 | 797 | ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr, pw); |
3c0ef626 | 798 | |
799 | /* We no longer need the private host keys. Clear them now. */ | |
800 | if (sensitive_data.nkeys != 0) { | |
801 | for (i = 0; i < sensitive_data.nkeys; i++) { | |
802 | if (sensitive_data.keys[i] != NULL) { | |
803 | /* Destroys contents safely */ | |
804 | debug3("clear hostkey %d", i); | |
805 | key_free(sensitive_data.keys[i]); | |
806 | sensitive_data.keys[i] = NULL; | |
807 | } | |
808 | } | |
809 | xfree(sensitive_data.keys); | |
810 | } | |
811 | for (i = 0; i < options.num_identity_files; i++) { | |
812 | if (options.identity_files[i]) { | |
813 | xfree(options.identity_files[i]); | |
814 | options.identity_files[i] = NULL; | |
815 | } | |
816 | if (options.identity_keys[i]) { | |
817 | key_free(options.identity_keys[i]); | |
818 | options.identity_keys[i] = NULL; | |
819 | } | |
820 | } | |
821 | ||
822 | exit_status = compat20 ? ssh_session2() : ssh_session(); | |
823 | packet_close(); | |
e54b3d7c | 824 | |
1b56ff3d | 825 | if (options.control_path != NULL && control_fd != -1) |
826 | unlink(options.control_path); | |
827 | ||
e54b3d7c | 828 | /* |
416fd2a8 | 829 | * Send SIGHUP to proxy command if used. We don't wait() in |
e54b3d7c | 830 | * case it hangs and instead rely on init to reap the child |
831 | */ | |
832 | if (proxy_command_pid > 1) | |
833 | kill(proxy_command_pid, SIGHUP); | |
834 | ||
3c0ef626 | 835 | return exit_status; |
836 | } | |
837 | ||
3c0ef626 | 838 | static void |
839 | ssh_init_forwarding(void) | |
840 | { | |
841 | int success = 0; | |
842 | int i; | |
843 | ||
844 | /* Initiate local TCP/IP port forwardings. */ | |
845 | for (i = 0; i < options.num_local_forwards; i++) { | |
34fee935 | 846 | debug("Local connections to %.200s:%d forwarded to remote " |
847 | "address %.200s:%d", | |
848 | (options.local_forwards[i].listen_host == NULL) ? | |
849 | (options.gateway_ports ? "*" : "LOCALHOST") : | |
850 | options.local_forwards[i].listen_host, | |
851 | options.local_forwards[i].listen_port, | |
852 | options.local_forwards[i].connect_host, | |
853 | options.local_forwards[i].connect_port); | |
e9a17296 | 854 | success += channel_setup_local_fwd_listener( |
34fee935 | 855 | options.local_forwards[i].listen_host, |
856 | options.local_forwards[i].listen_port, | |
857 | options.local_forwards[i].connect_host, | |
858 | options.local_forwards[i].connect_port, | |
e00da40d | 859 | options.gateway_ports, options.hpn_disabled, |
860 | options.hpn_buffer_size); | |
3c0ef626 | 861 | } |
2e437378 | 862 | if (i > 0 && success != i && options.exit_on_forward_failure) |
863 | fatal("Could not request local forwarding."); | |
3c0ef626 | 864 | if (i > 0 && success == 0) |
865 | error("Could not request local forwarding."); | |
866 | ||
867 | /* Initiate remote TCP/IP port forwardings. */ | |
868 | for (i = 0; i < options.num_remote_forwards; i++) { | |
34fee935 | 869 | debug("Remote connections from %.200s:%d forwarded to " |
870 | "local address %.200s:%d", | |
871 | (options.remote_forwards[i].listen_host == NULL) ? | |
e00da40d | 872 | "LOCALHOST" : options.remote_forwards[i].listen_host, |
34fee935 | 873 | options.remote_forwards[i].listen_port, |
874 | options.remote_forwards[i].connect_host, | |
875 | options.remote_forwards[i].connect_port); | |
2e437378 | 876 | if (channel_request_remote_forwarding( |
34fee935 | 877 | options.remote_forwards[i].listen_host, |
878 | options.remote_forwards[i].listen_port, | |
879 | options.remote_forwards[i].connect_host, | |
2e437378 | 880 | options.remote_forwards[i].connect_port) < 0) { |
881 | if (options.exit_on_forward_failure) | |
882 | fatal("Could not request remote forwarding."); | |
883 | else | |
884 | logit("Warning: Could not request remote " | |
885 | "forwarding."); | |
886 | } | |
3c0ef626 | 887 | } |
888 | } | |
889 | ||
890 | static void | |
891 | check_agent_present(void) | |
892 | { | |
893 | if (options.forward_agent) { | |
e00da40d | 894 | /* Clear agent forwarding if we don't have an agent. */ |
e54b3d7c | 895 | if (!ssh_agent_present()) |
3c0ef626 | 896 | options.forward_agent = 0; |
3c0ef626 | 897 | } |
898 | } | |
899 | ||
900 | static int | |
901 | ssh_session(void) | |
902 | { | |
903 | int type; | |
3c0ef626 | 904 | int interactive = 0; |
905 | int have_tty = 0; | |
906 | struct winsize ws; | |
907 | char *cp; | |
34fee935 | 908 | const char *display; |
3c0ef626 | 909 | |
910 | /* Enable compression if requested. */ | |
911 | if (options.compression) { | |
912 | debug("Requesting compression at level %d.", options.compression_level); | |
913 | ||
914 | if (options.compression_level < 1 || options.compression_level > 9) | |
915 | fatal("Compression level must be from 1 (fast) to 9 (slow, best)."); | |
916 | ||
917 | /* Send the request. */ | |
918 | packet_start(SSH_CMSG_REQUEST_COMPRESSION); | |
919 | packet_put_int(options.compression_level); | |
920 | packet_send(); | |
921 | packet_write_wait(); | |
e9a17296 | 922 | type = packet_read(); |
3c0ef626 | 923 | if (type == SSH_SMSG_SUCCESS) |
924 | packet_start_compression(options.compression_level); | |
925 | else if (type == SSH_SMSG_FAILURE) | |
70791e56 | 926 | logit("Warning: Remote host refused compression."); |
3c0ef626 | 927 | else |
928 | packet_disconnect("Protocol error waiting for compression response."); | |
929 | } | |
930 | /* Allocate a pseudo tty if appropriate. */ | |
931 | if (tty_flag) { | |
932 | debug("Requesting pty."); | |
933 | ||
934 | /* Start the packet. */ | |
935 | packet_start(SSH_CMSG_REQUEST_PTY); | |
936 | ||
937 | /* Store TERM in the packet. There is no limit on the | |
938 | length of the string. */ | |
939 | cp = getenv("TERM"); | |
940 | if (!cp) | |
941 | cp = ""; | |
942 | packet_put_cstring(cp); | |
943 | ||
944 | /* Store window size in the packet. */ | |
945 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) | |
946 | memset(&ws, 0, sizeof(ws)); | |
2e437378 | 947 | packet_put_int((u_int)ws.ws_row); |
948 | packet_put_int((u_int)ws.ws_col); | |
949 | packet_put_int((u_int)ws.ws_xpixel); | |
950 | packet_put_int((u_int)ws.ws_ypixel); | |
3c0ef626 | 951 | |
952 | /* Store tty modes in the packet. */ | |
953 | tty_make_modes(fileno(stdin), NULL); | |
954 | ||
955 | /* Send the packet, and wait for it to leave. */ | |
956 | packet_send(); | |
957 | packet_write_wait(); | |
958 | ||
959 | /* Read response from the server. */ | |
e9a17296 | 960 | type = packet_read(); |
3c0ef626 | 961 | if (type == SSH_SMSG_SUCCESS) { |
962 | interactive = 1; | |
963 | have_tty = 1; | |
964 | } else if (type == SSH_SMSG_FAILURE) | |
70791e56 | 965 | logit("Warning: Remote host failed or refused to allocate a pseudo tty."); |
3c0ef626 | 966 | else |
967 | packet_disconnect("Protocol error waiting for pty request response."); | |
968 | } | |
969 | /* Request X11 forwarding if enabled and DISPLAY is set. */ | |
34fee935 | 970 | display = getenv("DISPLAY"); |
971 | if (options.forward_x11 && display != NULL) { | |
e9a17296 | 972 | char *proto, *data; |
3c0ef626 | 973 | /* Get reasonable local authentication information. */ |
34fee935 | 974 | client_x11_get_proto(display, options.xauth_location, |
975 | options.forward_x11_trusted, &proto, &data); | |
3c0ef626 | 976 | /* Request forwarding with authentication spoofing. */ |
977 | debug("Requesting X11 forwarding with authentication spoofing."); | |
34fee935 | 978 | x11_request_forwarding_with_spoofing(0, display, proto, data); |
3c0ef626 | 979 | |
980 | /* Read response from the server. */ | |
e9a17296 | 981 | type = packet_read(); |
3c0ef626 | 982 | if (type == SSH_SMSG_SUCCESS) { |
983 | interactive = 1; | |
984 | } else if (type == SSH_SMSG_FAILURE) { | |
70791e56 | 985 | logit("Warning: Remote host denied X11 forwarding."); |
3c0ef626 | 986 | } else { |
987 | packet_disconnect("Protocol error waiting for X11 forwarding"); | |
988 | } | |
989 | } | |
990 | /* Tell the packet module whether this is an interactive session. */ | |
991 | packet_set_interactive(interactive); | |
992 | ||
993 | /* Request authentication agent forwarding if appropriate. */ | |
994 | check_agent_present(); | |
995 | ||
996 | if (options.forward_agent) { | |
997 | debug("Requesting authentication agent forwarding."); | |
998 | auth_request_forwarding(); | |
999 | ||
1000 | /* Read response from the server. */ | |
e9a17296 | 1001 | type = packet_read(); |
1002 | packet_check_eom(); | |
3c0ef626 | 1003 | if (type != SSH_SMSG_SUCCESS) |
70791e56 | 1004 | logit("Warning: Remote host denied authentication agent forwarding."); |
3c0ef626 | 1005 | } |
1006 | ||
1007 | /* Initiate port forwardings. */ | |
1008 | ssh_init_forwarding(); | |
1009 | ||
1010 | /* If requested, let ssh continue in the background. */ | |
1011 | if (fork_after_authentication_flag) | |
1012 | if (daemon(1, 1) < 0) | |
1013 | fatal("daemon() failed: %.200s", strerror(errno)); | |
1014 | ||
1015 | /* | |
1016 | * If a command was specified on the command line, execute the | |
1017 | * command now. Otherwise request the server to start a shell. | |
1018 | */ | |
1019 | if (buffer_len(&command) > 0) { | |
1020 | int len = buffer_len(&command); | |
1021 | if (len > 900) | |
1022 | len = 900; | |
e9a17296 | 1023 | debug("Sending command: %.*s", len, (u_char *)buffer_ptr(&command)); |
3c0ef626 | 1024 | packet_start(SSH_CMSG_EXEC_CMD); |
1025 | packet_put_string(buffer_ptr(&command), buffer_len(&command)); | |
1026 | packet_send(); | |
1027 | packet_write_wait(); | |
1028 | } else { | |
1029 | debug("Requesting shell."); | |
1030 | packet_start(SSH_CMSG_EXEC_SHELL); | |
1031 | packet_send(); | |
1032 | packet_write_wait(); | |
1033 | } | |
1034 | ||
1035 | /* Enter the interactive session. */ | |
1036 | return client_loop(have_tty, tty_flag ? | |
1037 | options.escape_char : SSH_ESCAPECHAR_NONE, 0); | |
1038 | } | |
1039 | ||
1040 | static void | |
1b56ff3d | 1041 | ssh_subsystem_reply(int type, u_int32_t seq, void *ctxt) |
3c0ef626 | 1042 | { |
1043 | int id, len; | |
1044 | ||
1045 | id = packet_get_int(); | |
1046 | len = buffer_len(&command); | |
1047 | if (len > 900) | |
1048 | len = 900; | |
e9a17296 | 1049 | packet_check_eom(); |
3c0ef626 | 1050 | if (type == SSH2_MSG_CHANNEL_FAILURE) |
1051 | fatal("Request for subsystem '%.*s' failed on channel %d", | |
e9a17296 | 1052 | len, (u_char *)buffer_ptr(&command), id); |
3c0ef626 | 1053 | } |
1054 | ||
2980ea68 | 1055 | void |
416fd2a8 | 1056 | client_global_request_reply_fwd(int type, u_int32_t seq, void *ctxt) |
2980ea68 | 1057 | { |
1058 | int i; | |
1059 | ||
1060 | i = client_global_request_id++; | |
416fd2a8 | 1061 | if (i >= options.num_remote_forwards) |
2980ea68 | 1062 | return; |
2980ea68 | 1063 | debug("remote forward %s for: listen %d, connect %s:%d", |
1064 | type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure", | |
34fee935 | 1065 | options.remote_forwards[i].listen_port, |
1066 | options.remote_forwards[i].connect_host, | |
1067 | options.remote_forwards[i].connect_port); | |
2e437378 | 1068 | if (type == SSH2_MSG_REQUEST_FAILURE) { |
1069 | if (options.exit_on_forward_failure) | |
1070 | fatal("Error: remote port forwarding failed for " | |
1071 | "listen port %d", | |
1072 | options.remote_forwards[i].listen_port); | |
1073 | else | |
1074 | logit("Warning: remote port forwarding failed for " | |
1075 | "listen port %d", | |
1076 | options.remote_forwards[i].listen_port); | |
1077 | } | |
2980ea68 | 1078 | } |
1079 | ||
3c0ef626 | 1080 | static void |
1b56ff3d | 1081 | ssh_control_listener(void) |
3c0ef626 | 1082 | { |
1b56ff3d | 1083 | struct sockaddr_un addr; |
1084 | mode_t old_umask; | |
1085 | int addr_len; | |
3c0ef626 | 1086 | |
34fee935 | 1087 | if (options.control_path == NULL || |
1088 | options.control_master == SSHCTL_MASTER_NO) | |
1b56ff3d | 1089 | return; |
3c0ef626 | 1090 | |
34fee935 | 1091 | debug("setting up multiplex master socket"); |
1092 | ||
1b56ff3d | 1093 | memset(&addr, '\0', sizeof(addr)); |
1094 | addr.sun_family = AF_UNIX; | |
1095 | addr_len = offsetof(struct sockaddr_un, sun_path) + | |
1096 | strlen(options.control_path) + 1; | |
3c0ef626 | 1097 | |
1b56ff3d | 1098 | if (strlcpy(addr.sun_path, options.control_path, |
1099 | sizeof(addr.sun_path)) >= sizeof(addr.sun_path)) | |
1100 | fatal("ControlPath too long"); | |
1101 | ||
1102 | if ((control_fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) | |
e00da40d | 1103 | fatal("%s socket(): %s", __func__, strerror(errno)); |
1b56ff3d | 1104 | |
1105 | old_umask = umask(0177); | |
2e437378 | 1106 | if (bind(control_fd, (struct sockaddr *)&addr, addr_len) == -1) { |
1b56ff3d | 1107 | control_fd = -1; |
34fee935 | 1108 | if (errno == EINVAL || errno == EADDRINUSE) |
1b56ff3d | 1109 | fatal("ControlSocket %s already exists", |
1110 | options.control_path); | |
1111 | else | |
e00da40d | 1112 | fatal("%s bind(): %s", __func__, strerror(errno)); |
3c0ef626 | 1113 | } |
1b56ff3d | 1114 | umask(old_umask); |
1115 | ||
1116 | if (listen(control_fd, 64) == -1) | |
e00da40d | 1117 | fatal("%s listen(): %s", __func__, strerror(errno)); |
1b56ff3d | 1118 | |
1119 | set_nonblock(control_fd); | |
1120 | } | |
1121 | ||
1122 | /* request pty/x11/agent/tcpfwd/shell for channel */ | |
1123 | static void | |
1124 | ssh_session2_setup(int id, void *arg) | |
1125 | { | |
1126 | extern char **environ; | |
34fee935 | 1127 | const char *display; |
1b56ff3d | 1128 | int interactive = tty_flag; |
34fee935 | 1129 | |
1130 | display = getenv("DISPLAY"); | |
1131 | if (options.forward_x11 && display != NULL) { | |
e9a17296 | 1132 | char *proto, *data; |
3c0ef626 | 1133 | /* Get reasonable local authentication information. */ |
34fee935 | 1134 | client_x11_get_proto(display, options.xauth_location, |
1135 | options.forward_x11_trusted, &proto, &data); | |
3c0ef626 | 1136 | /* Request forwarding with authentication spoofing. */ |
1137 | debug("Requesting X11 forwarding with authentication spoofing."); | |
34fee935 | 1138 | x11_request_forwarding_with_spoofing(id, display, proto, data); |
3c0ef626 | 1139 | interactive = 1; |
1140 | /* XXX wait for reply */ | |
1141 | } | |
1142 | ||
1143 | check_agent_present(); | |
1144 | if (options.forward_agent) { | |
1145 | debug("Requesting authentication agent forwarding."); | |
1146 | channel_request_start(id, "auth-agent-req@openssh.com", 0); | |
1147 | packet_send(); | |
1148 | } | |
1149 | ||
e00da40d | 1150 | if (options.tun_open != SSH_TUNMODE_NO) { |
1151 | Channel *c; | |
1152 | int fd; | |
1153 | ||
1154 | debug("Requesting tun."); | |
1155 | if ((fd = tun_open(options.tun_local, | |
1156 | options.tun_open)) >= 0) { | |
1157 | if(options.hpn_disabled) | |
1158 | c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1, | |
1159 | CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, | |
1160 | 0, "tun", 1); | |
1161 | else | |
1162 | c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1, | |
1163 | options.hpn_buffer_size, CHAN_TCP_PACKET_DEFAULT, | |
1164 | 0, "tun", 1); | |
1165 | c->datagram = 1; | |
1166 | #if defined(SSH_TUN_FILTER) | |
1167 | if (options.tun_open == SSH_TUNMODE_POINTOPOINT) | |
1168 | channel_register_filter(c->self, sys_tun_infilter, | |
1169 | sys_tun_outfilter); | |
1170 | #endif | |
1171 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
1172 | packet_put_cstring("tun@openssh.com"); | |
1173 | packet_put_int(c->self); | |
1174 | packet_put_int(c->local_window_max); | |
1175 | packet_put_int(c->local_maxpacket); | |
1176 | packet_put_int(options.tun_open); | |
1177 | packet_put_int(options.tun_remote); | |
1178 | packet_send(); | |
1179 | } | |
1180 | } | |
1181 | ||
1b56ff3d | 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; | |
2e437378 | 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 | ||
2e437378 | 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 */ | |
1229 | /* unless the user hasspecifically set the hpnrcvbufpoll */ | |
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 | ||
e00da40d | 1233 | if(options.hpn_disabled) |
2e437378 | 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; | |
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); | |
1260 | if (options.tcp_rcv_buf_poll <= 0) | |
1261 | { | |
1262 | options.hpn_buffer_size = MIN(socksize,options.hpn_buffer_size); | |
1263 | debug ("MIN of TCP RWIN and HPNBufferSize: %d", options.hpn_buffer_size); | |
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); | |
1269 | debug ("MIN of TCPRcvBuf and HPNBufferSize: %d", options.hpn_buffer_size); | |
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; |
e9a17296 | 1279 | if (tty_flag) { |
34fee935 | 1280 | window = 4*CHAN_SES_PACKET_DEFAULT; |
e9a17296 | 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, | |
70791e56 | 1287 | "client-session", /*nonblock*/0); |
e00da40d | 1288 | if ((options.tcp_rcv_buf_poll > 0) && (!options.hpn_disabled)) { |
34fee935 | 1289 | c->dynamic_window = 1; |
e00da40d | 1290 | debug ("Enabled Dynamic Window Scaling\n"); |
34fee935 | 1291 | } |
3c0ef626 | 1292 | debug3("ssh_session2_open: channel_new: %d", c->self); |
1293 | ||
1294 | channel_send_open(c->self); | |
1295 | if (!no_shell_flag) | |
1b56ff3d | 1296 | channel_register_confirm(c->self, ssh_session2_setup, NULL); |
3c0ef626 | 1297 | |
1298 | return c->self; | |
1299 | } | |
1300 | ||
1301 | static int | |
1302 | ssh_session2(void) | |
1303 | { | |
1304 | int id = -1; | |
1305 | ||
1306 | /* XXX should be pre-session */ | |
1307 | ssh_init_forwarding(); | |
1b56ff3d | 1308 | ssh_control_listener(); |
3c0ef626 | 1309 | |
1310 | if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN)) | |
1311 | id = ssh_session2_open(); | |
1312 | ||
e00da40d | 1313 | /* Execute a local command */ |
1314 | if (options.local_command != NULL && | |
1315 | options.permit_local_command) | |
1316 | ssh_local_cmd(options.local_command); | |
1317 | ||
3c0ef626 | 1318 | /* If requested, let ssh continue in the background. */ |
1319 | if (fork_after_authentication_flag) | |
1320 | if (daemon(1, 1) < 0) | |
1321 | fatal("daemon() failed: %.200s", strerror(errno)); | |
1322 | ||
1323 | return client_loop(tty_flag, tty_flag ? | |
1324 | options.escape_char : SSH_ESCAPECHAR_NONE, id); | |
1325 | } | |
1326 | ||
1327 | static void | |
1328 | load_public_identity_files(void) | |
1329 | { | |
2e437378 | 1330 | char *filename, *cp, thishost[NI_MAXHOST]; |
3c0ef626 | 1331 | int i = 0; |
2980ea68 | 1332 | Key *public; |
2e437378 | 1333 | struct passwd *pw; |
3c0ef626 | 1334 | #ifdef SMARTCARD |
2980ea68 | 1335 | Key **keys; |
1336 | ||
3c0ef626 | 1337 | if (options.smartcard_device != NULL && |
2980ea68 | 1338 | options.num_identity_files < SSH_MAX_IDENTITY_FILES && |
2e437378 | 1339 | (keys = sc_get_keys(options.smartcard_device, NULL)) != NULL) { |
2980ea68 | 1340 | int count = 0; |
1341 | for (i = 0; keys[i] != NULL; i++) { | |
1342 | count++; | |
1343 | memmove(&options.identity_files[1], &options.identity_files[0], | |
1344 | sizeof(char *) * (SSH_MAX_IDENTITY_FILES - 1)); | |
1345 | memmove(&options.identity_keys[1], &options.identity_keys[0], | |
1346 | sizeof(Key *) * (SSH_MAX_IDENTITY_FILES - 1)); | |
1347 | options.num_identity_files++; | |
1348 | options.identity_keys[0] = keys[i]; | |
70791e56 | 1349 | options.identity_files[0] = sc_get_key_label(keys[i]); |
2980ea68 | 1350 | } |
1351 | if (options.num_identity_files > SSH_MAX_IDENTITY_FILES) | |
1352 | options.num_identity_files = SSH_MAX_IDENTITY_FILES; | |
1353 | i = count; | |
1354 | xfree(keys); | |
3c0ef626 | 1355 | } |
1356 | #endif /* SMARTCARD */ | |
2e437378 | 1357 | if ((pw = getpwuid(original_real_uid)) == NULL) |
1358 | fatal("load_public_identity_files: getpwuid failed"); | |
1359 | if (gethostname(thishost, sizeof(thishost)) == -1) | |
1360 | fatal("load_public_identity_files: gethostname: %s", | |
1361 | strerror(errno)); | |
3c0ef626 | 1362 | for (; i < options.num_identity_files; i++) { |
2e437378 | 1363 | cp = tilde_expand_filename(options.identity_files[i], |
3c0ef626 | 1364 | original_real_uid); |
2e437378 | 1365 | filename = percent_expand(cp, "d", pw->pw_dir, |
1366 | "u", pw->pw_name, "l", thishost, "h", host, | |
1367 | "r", options.user, (char *)NULL); | |
1368 | xfree(cp); | |
3c0ef626 | 1369 | public = key_load_public(filename, NULL); |
1370 | debug("identity file %s type %d", filename, | |
1371 | public ? public->type : -1); | |
1372 | xfree(options.identity_files[i]); | |
1373 | options.identity_files[i] = filename; | |
1374 | options.identity_keys[i] = public; | |
1375 | } | |
1376 | } | |
1b56ff3d | 1377 | |
1378 | static void | |
1379 | control_client_sighandler(int signo) | |
1380 | { | |
1381 | control_client_terminate = signo; | |
1382 | } | |
1383 | ||
1384 | static void | |
1385 | control_client_sigrelay(int signo) | |
1386 | { | |
1387 | if (control_server_pid > 1) | |
1388 | kill(control_server_pid, signo); | |
1389 | } | |
1390 | ||
1391 | static int | |
1392 | env_permitted(char *env) | |
1393 | { | |
2e437378 | 1394 | int i, ret; |
1b56ff3d | 1395 | char name[1024], *cp; |
1396 | ||
2e437378 | 1397 | if ((cp = strchr(env, '=')) == NULL || cp == env) |
1b56ff3d | 1398 | return (0); |
2e437378 | 1399 | ret = snprintf(name, sizeof(name), "%.*s", (int)(cp - env), env); |
1400 | if (ret <= 0 || (size_t)ret >= sizeof(name)) | |
1401 | fatal("env_permitted: name '%.100s...' too long", env); | |
1b56ff3d | 1402 | |
1403 | for (i = 0; i < options.num_send_env; i++) | |
1404 | if (match_pattern(name, options.send_env[i])) | |
1405 | return (1); | |
1406 | ||
1407 | return (0); | |
1408 | } | |
1409 | ||
1410 | static void | |
1411 | control_client(const char *path) | |
1412 | { | |
1413 | struct sockaddr_un addr; | |
34fee935 | 1414 | int i, r, fd, sock, exitval, num_env, addr_len; |
1b56ff3d | 1415 | Buffer m; |
34fee935 | 1416 | char *term; |
1b56ff3d | 1417 | extern char **environ; |
34fee935 | 1418 | u_int flags; |
1419 | ||
1420 | if (mux_command == 0) | |
1421 | mux_command = SSHMUX_COMMAND_OPEN; | |
1422 | ||
1423 | switch (options.control_master) { | |
1424 | case SSHCTL_MASTER_AUTO: | |
1425 | case SSHCTL_MASTER_AUTO_ASK: | |
1426 | debug("auto-mux: Trying existing master"); | |
1427 | /* FALLTHROUGH */ | |
1428 | case SSHCTL_MASTER_NO: | |
1429 | break; | |
1430 | default: | |
1431 | return; | |
1432 | } | |
1b56ff3d | 1433 | |
1434 | memset(&addr, '\0', sizeof(addr)); | |
1435 | addr.sun_family = AF_UNIX; | |
1436 | addr_len = offsetof(struct sockaddr_un, sun_path) + | |
1437 | strlen(path) + 1; | |
1438 | ||
1439 | if (strlcpy(addr.sun_path, path, | |
1440 | sizeof(addr.sun_path)) >= sizeof(addr.sun_path)) | |
1441 | fatal("ControlPath too long"); | |
1442 | ||
1443 | if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) | |
1444 | fatal("%s socket(): %s", __func__, strerror(errno)); | |
1445 | ||
2e437378 | 1446 | if (connect(sock, (struct sockaddr *)&addr, addr_len) == -1) { |
34fee935 | 1447 | if (mux_command != SSHMUX_COMMAND_OPEN) { |
1448 | fatal("Control socket connect(%.100s): %s", path, | |
1449 | strerror(errno)); | |
1450 | } | |
1451 | if (errno == ENOENT) | |
2e437378 | 1452 | debug("Control socket \"%.100s\" does not exist", path); |
34fee935 | 1453 | else { |
2e437378 | 1454 | error("Control socket connect(%.100s): %s", path, |
34fee935 | 1455 | strerror(errno)); |
1456 | } | |
2e437378 | 1457 | close(sock); |
1458 | return; | |
1459 | } | |
1460 | ||
1461 | if (stdin_null_flag) { | |
1462 | if ((fd = open(_PATH_DEVNULL, O_RDONLY)) == -1) | |
1463 | fatal("open(/dev/null): %s", strerror(errno)); | |
1464 | if (dup2(fd, STDIN_FILENO) == -1) | |
1465 | fatal("dup2: %s", strerror(errno)); | |
1466 | if (fd > STDERR_FILENO) | |
1467 | close(fd); | |
1468 | } | |
34fee935 | 1469 | |
1470 | term = getenv("TERM"); | |
1471 | ||
1472 | flags = 0; | |
1473 | if (tty_flag) | |
1474 | flags |= SSHMUX_FLAG_TTY; | |
1475 | if (subsystem_flag) | |
1476 | flags |= SSHMUX_FLAG_SUBSYS; | |
1477 | if (options.forward_x11) | |
1478 | flags |= SSHMUX_FLAG_X11_FWD; | |
1479 | if (options.forward_agent) | |
1480 | flags |= SSHMUX_FLAG_AGENT_FWD; | |
e00da40d | 1481 | if (options.num_local_forwards > 0) |
1482 | flags |= SSHMUX_FLAG_PORTFORWARD; | |
1b56ff3d | 1483 | buffer_init(&m); |
1484 | ||
34fee935 | 1485 | /* Send our command to server */ |
1486 | buffer_put_int(&m, mux_command); | |
1487 | buffer_put_int(&m, flags); | |
e00da40d | 1488 | if (options.num_local_forwards > 0) |
1489 | { | |
1490 | if (options.local_forwards[0].listen_host == NULL) | |
1491 | buffer_put_string(&m,"LOCALHOST",11); | |
1492 | else | |
1493 | buffer_put_string(&m,options.local_forwards[0].listen_host,512); | |
1494 | buffer_put_int(&m,options.local_forwards[0].listen_port); | |
1495 | buffer_put_string(&m,options.local_forwards[0].connect_host,512); | |
1496 | buffer_put_int(&m,options.local_forwards[0].connect_port); | |
1497 | } | |
34fee935 | 1498 | if (ssh_msg_send(sock, SSHMUX_VER, &m) == -1) |
1499 | fatal("%s: msg_send", __func__); | |
1500 | buffer_clear(&m); | |
1501 | ||
1502 | /* Get authorisation status and PID of controlee */ | |
1b56ff3d | 1503 | if (ssh_msg_recv(sock, &m) == -1) |
1504 | fatal("%s: msg_recv", __func__); | |
34fee935 | 1505 | if (buffer_get_char(&m) != SSHMUX_VER) |
1b56ff3d | 1506 | fatal("%s: wrong version", __func__); |
1b56ff3d | 1507 | if (buffer_get_int(&m) != 1) |
1508 | fatal("Connection to master denied"); | |
1509 | control_server_pid = buffer_get_int(&m); | |
1510 | ||
1511 | buffer_clear(&m); | |
1b56ff3d | 1512 | |
34fee935 | 1513 | switch (mux_command) { |
1514 | case SSHMUX_COMMAND_ALIVE_CHECK: | |
1515 | fprintf(stderr, "Master running (pid=%d)\r\n", | |
1516 | control_server_pid); | |
1517 | exit(0); | |
1518 | case SSHMUX_COMMAND_TERMINATE: | |
1519 | fprintf(stderr, "Exit request sent.\r\n"); | |
1520 | exit(0); | |
1521 | case SSHMUX_COMMAND_OPEN: | |
1522 | /* continue below */ | |
1523 | break; | |
1524 | default: | |
1525 | fatal("silly mux_command %d", mux_command); | |
1526 | } | |
1527 | ||
1528 | /* SSHMUX_COMMAND_OPEN */ | |
1529 | buffer_put_cstring(&m, term ? term : ""); | |
1b56ff3d | 1530 | buffer_append(&command, "\0", 1); |
1531 | buffer_put_cstring(&m, buffer_ptr(&command)); | |
1532 | ||
1533 | if (options.num_send_env == 0 || environ == NULL) { | |
1534 | buffer_put_int(&m, 0); | |
1535 | } else { | |
1536 | /* Pass environment */ | |
1537 | num_env = 0; | |
1538 | for (i = 0; environ[i] != NULL; i++) | |
1539 | if (env_permitted(environ[i])) | |
1540 | num_env++; /* Count */ | |
1541 | ||
1542 | buffer_put_int(&m, num_env); | |
1543 | ||
1544 | for (i = 0; environ[i] != NULL && num_env >= 0; i++) | |
1545 | if (env_permitted(environ[i])) { | |
1546 | num_env--; | |
1547 | buffer_put_cstring(&m, environ[i]); | |
1548 | } | |
1549 | } | |
1550 | ||
34fee935 | 1551 | if (ssh_msg_send(sock, SSHMUX_VER, &m) == -1) |
1b56ff3d | 1552 | fatal("%s: msg_send", __func__); |
1553 | ||
1554 | mm_send_fd(sock, STDIN_FILENO); | |
1555 | mm_send_fd(sock, STDOUT_FILENO); | |
1556 | mm_send_fd(sock, STDERR_FILENO); | |
1557 | ||
1558 | /* Wait for reply, so master has a chance to gather ttymodes */ | |
1559 | buffer_clear(&m); | |
1560 | if (ssh_msg_recv(sock, &m) == -1) | |
1561 | fatal("%s: msg_recv", __func__); | |
34fee935 | 1562 | if (buffer_get_char(&m) != SSHMUX_VER) |
1563 | fatal("%s: wrong version", __func__); | |
1b56ff3d | 1564 | buffer_free(&m); |
1565 | ||
34fee935 | 1566 | signal(SIGHUP, control_client_sighandler); |
1b56ff3d | 1567 | signal(SIGINT, control_client_sighandler); |
1568 | signal(SIGTERM, control_client_sighandler); | |
1569 | signal(SIGWINCH, control_client_sigrelay); | |
1570 | ||
1571 | if (tty_flag) | |
1572 | enter_raw_mode(); | |
1573 | ||
1574 | /* Stick around until the controlee closes the client_fd */ | |
1575 | exitval = 0; | |
1576 | for (;!control_client_terminate;) { | |
1577 | r = read(sock, &exitval, sizeof(exitval)); | |
1578 | if (r == 0) { | |
1579 | debug2("Received EOF from master"); | |
1580 | break; | |
1581 | } | |
1582 | if (r > 0) | |
1583 | debug2("Received exit status from master %d", exitval); | |
1584 | if (r == -1 && errno != EINTR) | |
1585 | fatal("%s: read %s", __func__, strerror(errno)); | |
1586 | } | |
1587 | ||
1588 | if (control_client_terminate) | |
1589 | debug2("Exiting on signal %d", control_client_terminate); | |
1590 | ||
1591 | close(sock); | |
1592 | ||
1593 | leave_raw_mode(); | |
1594 | ||
1595 | if (tty_flag && options.log_level != SYSLOG_LEVEL_QUIET) | |
1596 | fprintf(stderr, "Connection to master closed.\r\n"); | |
1597 | ||
1598 | exit(exitval); | |
1599 | } |