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47686178 | 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. | |
cdd66111 | 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" | |
9108f8d9 | 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> | |
47686178 | 75 | #include "openbsd-compat/openssl-compat.h" |
3c0ef626 | 76 | |
9108f8d9 | 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" | |
c9f39d2c | 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" | |
c9f39d2c | 98 | #include "sshpty.h" |
99 | #include "match.h" | |
100 | #include "msg.h" | |
101 | #include "monitor_fdpass.h" | |
102 | #include "uidswap.h" | |
9108f8d9 | 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 | |
f5799ae1 | 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. */ | |
f5799ae1 | 155 | Sensitive sensitive_data; |
3c0ef626 | 156 | |
157 | /* Original real UID. */ | |
158 | uid_t original_real_uid; | |
f5799ae1 | 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 | ||
700318f3 | 167 | /* # of replies received for global requests */ |
168 | static int client_global_request_id = 0; | |
169 | ||
41b2f314 | 170 | /* pid of proxycommand child process */ |
171 | pid_t proxy_command_pid = 0; | |
172 | ||
c9f39d2c | 173 | /* fd to control socket */ |
174 | int control_fd = -1; | |
175 | ||
996d5e62 | 176 | /* Multiplexing control command */ |
665a873d | 177 | static u_int mux_command = 0; |
996d5e62 | 178 | |
c9f39d2c | 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 | { | |
99be0775 | 188 | fprintf(stderr, |
d4487008 | 189 | "usage: ssh [-1246AaCfgKkMNnqsTtVvXxY] [-b bind_address] [-c cipher_spec]\n" |
2c06c99b | 190 | " [-D [bind_address:]port] [-e escape_char] [-F configfile]\n" |
996d5e62 | 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" | |
9108f8d9 | 194 | " [-w local_tun[:remote_tun]] [user@]hostname [command]\n" |
99be0775 | 195 | ); |
2c06c99b | 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); | |
c9f39d2c | 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 | { | |
f5799ae1 | 210 | int i, opt, exit_status; |
cdd66111 | 211 | char *p, *cp, *line, buf[256]; |
3c0ef626 | 212 | struct stat st; |
213 | struct passwd *pw; | |
47686178 | 214 | int dummy, timeout_ms; |
3c0ef626 | 215 | extern int optind, optreset; |
216 | extern char *optarg; | |
665a873d | 217 | struct servent *sp; |
996d5e62 | 218 | Forward fwd; |
3c0ef626 | 219 | |
2c06c99b | 220 | /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ |
221 | sanitise_stdfd(); | |
222 | ||
0fff78ff | 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(); | |
cdd66111 | 232 | |
41b2f314 | 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) { | |
0fff78ff | 254 | logit("You don't exist, go away!"); |
2c06c99b | 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 | ||
9108f8d9 | 274 | again: |
3c0ef626 | 275 | while ((opt = getopt(ac, av, |
d4487008 | 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': | |
0fff78ff | 285 | options.address_family = AF_INET; |
3c0ef626 | 286 | break; |
287 | case '6': | |
0fff78ff | 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; | |
cdd66111 | 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; | |
996d5e62 | 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; | |
41b2f314 | 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': |
cdd66111 | 328 | options.gss_deleg_creds = 0; |
3c0ef626 | 329 | break; |
d4487008 | 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 " | |
996d5e62 | 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': | |
0fff78ff | 361 | if (debug_flag == 0) { |
3c0ef626 | 362 | debug_flag = 1; |
363 | options.log_level = SYSLOG_LEVEL_DEBUG1; | |
0fff78ff | 364 | } else { |
365 | if (options.log_level < SYSLOG_LEVEL_DEBUG3) | |
366 | options.log_level++; | |
3c0ef626 | 367 | break; |
0fff78ff | 368 | } |
996d5e62 | 369 | /* FALLTHROUGH */ |
3c0ef626 | 370 | case 'V': |
99be0775 | 371 | fprintf(stderr, "%s, %s\n", |
996d5e62 | 372 | SSH_RELEASE, SSLeay_version(SSLEAY_VERSION)); |
3c0ef626 | 373 | if (opt == 'V') |
374 | exit(0); | |
375 | break; | |
2c06c99b | 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); | |
2c06c99b | 400 | exit(255); |
3c0ef626 | 401 | } |
402 | break; | |
403 | case 'c': | |
404 | if (ciphers_valid(optarg)) { | |
405 | /* SSH2 only */ | |
406 | options.ciphers = xstrdup(optarg); | |
c9f39d2c | 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); | |
2c06c99b | 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); | |
2c06c99b | 431 | exit(255); |
3c0ef626 | 432 | } |
433 | break; | |
c9f39d2c | 434 | case 'M': |
665a873d | 435 | if (options.control_master == SSHCTL_MASTER_YES) |
436 | options.control_master = SSHCTL_MASTER_ASK; | |
437 | else | |
438 | options.control_master = SSHCTL_MASTER_YES; | |
c9f39d2c | 439 | break; |
3c0ef626 | 440 | case 'p': |
441 | options.port = a2port(optarg); | |
442 | if (options.port == 0) { | |
443 | fprintf(stderr, "Bad port '%s'\n", optarg); | |
2c06c99b | 444 | exit(255); |
3c0ef626 | 445 | } |
446 | break; | |
447 | case 'l': | |
448 | options.user = optarg; | |
449 | break; | |
450 | ||
451 | case 'L': | |
996d5e62 | 452 | if (parse_forward(&fwd, optarg)) |
453 | add_local_forward(&options, &fwd); | |
454 | else { | |
3c0ef626 | 455 | fprintf(stderr, |
996d5e62 | 456 | "Bad local forwarding specification '%s'\n", |
3c0ef626 | 457 | optarg); |
2c06c99b | 458 | exit(255); |
3c0ef626 | 459 | } |
996d5e62 | 460 | break; |
461 | ||
462 | case 'R': | |
463 | if (parse_forward(&fwd, optarg)) { | |
464 | add_remote_forward(&options, &fwd); | |
465 | } else { | |
3c0ef626 | 466 | fprintf(stderr, |
996d5e62 | 467 | "Bad remote forwarding specification " |
468 | "'%s'\n", optarg); | |
2c06c99b | 469 | exit(255); |
3c0ef626 | 470 | } |
3c0ef626 | 471 | break; |
472 | ||
473 | case 'D': | |
996d5e62 | 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); | |
2c06c99b | 480 | exit(255); |
996d5e62 | 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); | |
665a873d | 487 | fwd.listen_host = NULL; |
996d5e62 | 488 | } |
489 | ||
490 | if (fwd.listen_port == 0) { | |
3c0ef626 | 491 | fprintf(stderr, "Bad dynamic port '%s'\n", |
492 | optarg); | |
2c06c99b | 493 | exit(255); |
3c0ef626 | 494 | } |
996d5e62 | 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; | |
505 | break; | |
506 | case 'T': | |
507 | no_tty_flag = 1; | |
508 | break; | |
509 | case 'o': | |
510 | dummy = 1; | |
cdd66111 | 511 | line = xstrdup(optarg); |
3c0ef626 | 512 | if (process_config_line(&options, host ? host : "", |
cdd66111 | 513 | line, "command-line", 0, &dummy) != 0) |
2c06c99b | 514 | exit(255); |
cdd66111 | 515 | xfree(line); |
3c0ef626 | 516 | break; |
517 | case 's': | |
518 | subsystem_flag = 1; | |
519 | break; | |
c9f39d2c | 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 != '-') { | |
6a9b3198 | 540 | if (strrchr(*av, '@')) { |
3c0ef626 | 541 | p = xstrdup(*av); |
6a9b3198 | 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; | |
6a9b3198 | 550 | if (ac > 1) { |
551 | optind = optreset = 1; | |
3c0ef626 | 552 | goto again; |
553 | } | |
6a9b3198 | 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 | ||
41b2f314 | 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. */ | |
665a873d | 601 | if ((!isatty(fileno(stdin)) || stdin_null_flag) && !force_tty_flag) { |
3c0ef626 | 602 | if (tty_flag) |
0fff78ff | 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) { | |
c9f39d2c | 619 | if (!read_config_file(config, host, &options, 0)) |
3c0ef626 | 620 | fatal("Can't open user config file %.100s: " |
621 | "%.100s", config, strerror(errno)); | |
799ae497 | 622 | } else { |
3c0ef626 | 623 | snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, |
624 | _PATH_SSH_USER_CONFFILE); | |
c9f39d2c | 625 | (void)read_config_file(buf, host, &options, 1); |
3c0ef626 | 626 | |
627 | /* Read systemwide configuration file after use config. */ | |
c9f39d2c | 628 | (void)read_config_file(_PATH_HOST_CONFIG_FILE, host, |
629 | &options, 0); | |
3c0ef626 | 630 | } |
631 | ||
632 | /* Fill configuration defaults. */ | |
633 | fill_default_options(&options); | |
634 | ||
0fff78ff | 635 | channel_set_af(options.address_family); |
636 | ||
3c0ef626 | 637 | /* reinit */ |
638 | log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 1); | |
639 | ||
640 | seed_rng(); | |
641 | ||
642 | if (options.user == NULL) | |
643 | options.user = xstrdup(pw->pw_name); | |
644 | ||
645 | if (options.hostname != NULL) | |
646 | host = options.hostname; | |
647 | ||
0fff78ff | 648 | /* force lowercase for hostkey matching */ |
649 | if (options.host_key_alias != NULL) { | |
650 | for (p = options.host_key_alias; *p; p++) | |
651 | if (isupper(*p)) | |
9108f8d9 | 652 | *p = (char)tolower(*p); |
0fff78ff | 653 | } |
654 | ||
665a873d | 655 | /* Get default port if port has not been set. */ |
656 | if (options.port == 0) { | |
657 | sp = getservbyname(SSH_SERVICE_NAME, "tcp"); | |
658 | options.port = sp ? ntohs(sp->s_port) : SSH_DEFAULT_PORT; | |
659 | } | |
660 | ||
6a9b3198 | 661 | if (options.proxy_command != NULL && |
47686178 | 662 | strcmp(options.proxy_command, "none") == 0) { |
663 | xfree(options.proxy_command); | |
6a9b3198 | 664 | options.proxy_command = NULL; |
47686178 | 665 | } |
665a873d | 666 | if (options.control_path != NULL && |
47686178 | 667 | strcmp(options.control_path, "none") == 0) { |
668 | xfree(options.control_path); | |
665a873d | 669 | options.control_path = NULL; |
47686178 | 670 | } |
6a9b3198 | 671 | |
c9f39d2c | 672 | if (options.control_path != NULL) { |
9108f8d9 | 673 | char thishost[NI_MAXHOST]; |
674 | ||
675 | if (gethostname(thishost, sizeof(thishost)) == -1) | |
676 | fatal("gethostname: %s", strerror(errno)); | |
665a873d | 677 | snprintf(buf, sizeof(buf), "%d", options.port); |
678 | cp = tilde_expand_filename(options.control_path, | |
679 | original_real_uid); | |
47686178 | 680 | xfree(options.control_path); |
665a873d | 681 | options.control_path = percent_expand(cp, "p", buf, "h", host, |
9108f8d9 | 682 | "r", options.user, "l", thishost, (char *)NULL); |
665a873d | 683 | xfree(cp); |
c9f39d2c | 684 | } |
665a873d | 685 | if (mux_command != 0 && options.control_path == NULL) |
686 | fatal("No ControlPath specified for \"-O\" command"); | |
687 | if (options.control_path != NULL) | |
688 | control_client(options.control_path); | |
c9f39d2c | 689 | |
47686178 | 690 | timeout_ms = options.connection_timeout * 1000; |
691 | ||
3c0ef626 | 692 | /* Open a connection to the remote host. */ |
0fff78ff | 693 | if (ssh_connect(host, &hostaddr, options.port, |
47686178 | 694 | options.address_family, options.connection_attempts, &timeout_ms, |
695 | options.tcp_keep_alive, | |
f5799ae1 | 696 | #ifdef HAVE_CYGWIN |
697 | options.use_privileged_port, | |
698 | #else | |
699 | original_effective_uid == 0 && options.use_privileged_port, | |
700 | #endif | |
701 | options.proxy_command) != 0) | |
2c06c99b | 702 | exit(255); |
3c0ef626 | 703 | |
47686178 | 704 | if (timeout_ms > 0) |
705 | debug3("timeout: %d ms remain after connect", timeout_ms); | |
706 | ||
3c0ef626 | 707 | /* |
708 | * If we successfully made the connection, load the host private key | |
709 | * in case we will need it later for combined rsa-rhosts | |
710 | * authentication. This must be done before releasing extra | |
711 | * privileges, because the file is only readable by root. | |
f5799ae1 | 712 | * If we cannot access the private keys, load the public keys |
713 | * instead and try to execute the ssh-keysign helper instead. | |
3c0ef626 | 714 | */ |
715 | sensitive_data.nkeys = 0; | |
716 | sensitive_data.keys = NULL; | |
f5799ae1 | 717 | sensitive_data.external_keysign = 0; |
718 | if (options.rhosts_rsa_authentication || | |
719 | options.hostbased_authentication) { | |
3c0ef626 | 720 | sensitive_data.nkeys = 3; |
9108f8d9 | 721 | sensitive_data.keys = xcalloc(sensitive_data.nkeys, |
41b2f314 | 722 | sizeof(Key)); |
f5799ae1 | 723 | |
724 | PRIV_START; | |
3c0ef626 | 725 | sensitive_data.keys[0] = key_load_private_type(KEY_RSA1, |
9108f8d9 | 726 | _PATH_HOST_KEY_FILE, "", NULL, NULL); |
3c0ef626 | 727 | sensitive_data.keys[1] = key_load_private_type(KEY_DSA, |
9108f8d9 | 728 | _PATH_HOST_DSA_KEY_FILE, "", NULL, NULL); |
3c0ef626 | 729 | sensitive_data.keys[2] = key_load_private_type(KEY_RSA, |
9108f8d9 | 730 | _PATH_HOST_RSA_KEY_FILE, "", NULL, NULL); |
f5799ae1 | 731 | PRIV_END; |
732 | ||
41b2f314 | 733 | if (options.hostbased_authentication == 1 && |
734 | sensitive_data.keys[0] == NULL && | |
f5799ae1 | 735 | sensitive_data.keys[1] == NULL && |
736 | sensitive_data.keys[2] == NULL) { | |
737 | sensitive_data.keys[1] = key_load_public( | |
738 | _PATH_HOST_DSA_KEY_FILE, NULL); | |
739 | sensitive_data.keys[2] = key_load_public( | |
740 | _PATH_HOST_RSA_KEY_FILE, NULL); | |
741 | sensitive_data.external_keysign = 1; | |
742 | } | |
3c0ef626 | 743 | } |
744 | /* | |
745 | * Get rid of any extra privileges that we may have. We will no | |
746 | * longer need them. Also, extra privileges could make it very hard | |
747 | * to read identity files and other non-world-readable files from the | |
748 | * user's home directory if it happens to be on a NFS volume where | |
749 | * root is mapped to nobody. | |
750 | */ | |
c9f39d2c | 751 | if (original_effective_uid == 0) { |
752 | PRIV_START; | |
753 | permanently_set_uid(pw); | |
754 | } | |
3c0ef626 | 755 | |
756 | /* | |
757 | * Now that we are back to our own permissions, create ~/.ssh | |
2c06c99b | 758 | * directory if it doesn't already exist. |
3c0ef626 | 759 | */ |
760 | snprintf(buf, sizeof buf, "%.100s%s%.100s", pw->pw_dir, strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR); | |
761 | if (stat(buf, &st) < 0) | |
762 | if (mkdir(buf, 0700) < 0) | |
763 | error("Could not create directory '%.200s'.", buf); | |
764 | ||
3c0ef626 | 765 | /* load options.identity_files */ |
766 | load_public_identity_files(); | |
767 | ||
768 | /* Expand ~ in known host file names. */ | |
769 | /* XXX mem-leaks: */ | |
770 | options.system_hostfile = | |
771 | tilde_expand_filename(options.system_hostfile, original_real_uid); | |
772 | options.user_hostfile = | |
773 | tilde_expand_filename(options.user_hostfile, original_real_uid); | |
774 | options.system_hostfile2 = | |
775 | tilde_expand_filename(options.system_hostfile2, original_real_uid); | |
776 | options.user_hostfile2 = | |
777 | tilde_expand_filename(options.user_hostfile2, original_real_uid); | |
778 | ||
779 | signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */ | |
780 | ||
781 | /* Log into the remote system. This never returns if the login fails. */ | |
47686178 | 782 | ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr, |
783 | pw, timeout_ms); | |
3c0ef626 | 784 | |
785 | /* We no longer need the private host keys. Clear them now. */ | |
786 | if (sensitive_data.nkeys != 0) { | |
787 | for (i = 0; i < sensitive_data.nkeys; i++) { | |
788 | if (sensitive_data.keys[i] != NULL) { | |
789 | /* Destroys contents safely */ | |
790 | debug3("clear hostkey %d", i); | |
791 | key_free(sensitive_data.keys[i]); | |
792 | sensitive_data.keys[i] = NULL; | |
793 | } | |
794 | } | |
795 | xfree(sensitive_data.keys); | |
796 | } | |
797 | for (i = 0; i < options.num_identity_files; i++) { | |
798 | if (options.identity_files[i]) { | |
799 | xfree(options.identity_files[i]); | |
800 | options.identity_files[i] = NULL; | |
801 | } | |
802 | if (options.identity_keys[i]) { | |
803 | key_free(options.identity_keys[i]); | |
804 | options.identity_keys[i] = NULL; | |
805 | } | |
806 | } | |
807 | ||
808 | exit_status = compat20 ? ssh_session2() : ssh_session(); | |
809 | packet_close(); | |
41b2f314 | 810 | |
c9f39d2c | 811 | if (options.control_path != NULL && control_fd != -1) |
812 | unlink(options.control_path); | |
813 | ||
41b2f314 | 814 | /* |
cdd66111 | 815 | * Send SIGHUP to proxy command if used. We don't wait() in |
41b2f314 | 816 | * case it hangs and instead rely on init to reap the child |
817 | */ | |
818 | if (proxy_command_pid > 1) | |
819 | kill(proxy_command_pid, SIGHUP); | |
820 | ||
3c0ef626 | 821 | return exit_status; |
822 | } | |
823 | ||
3c0ef626 | 824 | static void |
825 | ssh_init_forwarding(void) | |
826 | { | |
827 | int success = 0; | |
828 | int i; | |
829 | ||
830 | /* Initiate local TCP/IP port forwardings. */ | |
831 | for (i = 0; i < options.num_local_forwards; i++) { | |
996d5e62 | 832 | debug("Local connections to %.200s:%d forwarded to remote " |
833 | "address %.200s:%d", | |
dec6d9fe | 834 | (options.local_forwards[i].listen_host == NULL) ? |
835 | (options.gateway_ports ? "*" : "LOCALHOST") : | |
996d5e62 | 836 | options.local_forwards[i].listen_host, |
837 | options.local_forwards[i].listen_port, | |
838 | options.local_forwards[i].connect_host, | |
839 | options.local_forwards[i].connect_port); | |
e9a17296 | 840 | success += channel_setup_local_fwd_listener( |
996d5e62 | 841 | options.local_forwards[i].listen_host, |
842 | options.local_forwards[i].listen_port, | |
843 | options.local_forwards[i].connect_host, | |
844 | options.local_forwards[i].connect_port, | |
3c0ef626 | 845 | options.gateway_ports); |
846 | } | |
9108f8d9 | 847 | if (i > 0 && success != i && options.exit_on_forward_failure) |
848 | fatal("Could not request local forwarding."); | |
3c0ef626 | 849 | if (i > 0 && success == 0) |
850 | error("Could not request local forwarding."); | |
851 | ||
852 | /* Initiate remote TCP/IP port forwardings. */ | |
853 | for (i = 0; i < options.num_remote_forwards; i++) { | |
996d5e62 | 854 | debug("Remote connections from %.200s:%d forwarded to " |
855 | "local address %.200s:%d", | |
665a873d | 856 | (options.remote_forwards[i].listen_host == NULL) ? |
2c06c99b | 857 | "LOCALHOST" : options.remote_forwards[i].listen_host, |
996d5e62 | 858 | options.remote_forwards[i].listen_port, |
859 | options.remote_forwards[i].connect_host, | |
860 | options.remote_forwards[i].connect_port); | |
9108f8d9 | 861 | if (channel_request_remote_forwarding( |
996d5e62 | 862 | options.remote_forwards[i].listen_host, |
863 | options.remote_forwards[i].listen_port, | |
864 | options.remote_forwards[i].connect_host, | |
9108f8d9 | 865 | options.remote_forwards[i].connect_port) < 0) { |
866 | if (options.exit_on_forward_failure) | |
867 | fatal("Could not request remote forwarding."); | |
868 | else | |
869 | logit("Warning: Could not request remote " | |
870 | "forwarding."); | |
871 | } | |
3c0ef626 | 872 | } |
d4487008 | 873 | |
874 | /* Initiate tunnel forwarding. */ | |
875 | if (options.tun_open != SSH_TUNMODE_NO) { | |
876 | if (client_request_tun_fwd(options.tun_open, | |
877 | options.tun_local, options.tun_remote) == -1) { | |
878 | if (options.exit_on_forward_failure) | |
879 | fatal("Could not request tunnel forwarding."); | |
880 | else | |
881 | error("Could not request tunnel forwarding."); | |
882 | } | |
883 | } | |
3c0ef626 | 884 | } |
885 | ||
886 | static void | |
887 | check_agent_present(void) | |
888 | { | |
889 | if (options.forward_agent) { | |
2c06c99b | 890 | /* Clear agent forwarding if we don't have an agent. */ |
41b2f314 | 891 | if (!ssh_agent_present()) |
3c0ef626 | 892 | options.forward_agent = 0; |
3c0ef626 | 893 | } |
894 | } | |
895 | ||
896 | static int | |
897 | ssh_session(void) | |
898 | { | |
899 | int type; | |
3c0ef626 | 900 | int interactive = 0; |
901 | int have_tty = 0; | |
902 | struct winsize ws; | |
903 | char *cp; | |
665a873d | 904 | const char *display; |
3c0ef626 | 905 | |
906 | /* Enable compression if requested. */ | |
907 | if (options.compression) { | |
908 | debug("Requesting compression at level %d.", options.compression_level); | |
909 | ||
910 | if (options.compression_level < 1 || options.compression_level > 9) | |
911 | fatal("Compression level must be from 1 (fast) to 9 (slow, best)."); | |
912 | ||
913 | /* Send the request. */ | |
914 | packet_start(SSH_CMSG_REQUEST_COMPRESSION); | |
915 | packet_put_int(options.compression_level); | |
916 | packet_send(); | |
917 | packet_write_wait(); | |
e9a17296 | 918 | type = packet_read(); |
3c0ef626 | 919 | if (type == SSH_SMSG_SUCCESS) |
920 | packet_start_compression(options.compression_level); | |
921 | else if (type == SSH_SMSG_FAILURE) | |
0fff78ff | 922 | logit("Warning: Remote host refused compression."); |
3c0ef626 | 923 | else |
924 | packet_disconnect("Protocol error waiting for compression response."); | |
925 | } | |
926 | /* Allocate a pseudo tty if appropriate. */ | |
927 | if (tty_flag) { | |
928 | debug("Requesting pty."); | |
929 | ||
930 | /* Start the packet. */ | |
931 | packet_start(SSH_CMSG_REQUEST_PTY); | |
932 | ||
933 | /* Store TERM in the packet. There is no limit on the | |
934 | length of the string. */ | |
935 | cp = getenv("TERM"); | |
936 | if (!cp) | |
937 | cp = ""; | |
938 | packet_put_cstring(cp); | |
939 | ||
940 | /* Store window size in the packet. */ | |
941 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) | |
942 | memset(&ws, 0, sizeof(ws)); | |
9108f8d9 | 943 | packet_put_int((u_int)ws.ws_row); |
944 | packet_put_int((u_int)ws.ws_col); | |
945 | packet_put_int((u_int)ws.ws_xpixel); | |
946 | packet_put_int((u_int)ws.ws_ypixel); | |
3c0ef626 | 947 | |
948 | /* Store tty modes in the packet. */ | |
949 | tty_make_modes(fileno(stdin), NULL); | |
950 | ||
951 | /* Send the packet, and wait for it to leave. */ | |
952 | packet_send(); | |
953 | packet_write_wait(); | |
954 | ||
955 | /* Read response from the server. */ | |
e9a17296 | 956 | type = packet_read(); |
3c0ef626 | 957 | if (type == SSH_SMSG_SUCCESS) { |
958 | interactive = 1; | |
959 | have_tty = 1; | |
960 | } else if (type == SSH_SMSG_FAILURE) | |
0fff78ff | 961 | logit("Warning: Remote host failed or refused to allocate a pseudo tty."); |
3c0ef626 | 962 | else |
963 | packet_disconnect("Protocol error waiting for pty request response."); | |
964 | } | |
965 | /* Request X11 forwarding if enabled and DISPLAY is set. */ | |
665a873d | 966 | display = getenv("DISPLAY"); |
967 | if (options.forward_x11 && display != NULL) { | |
e9a17296 | 968 | char *proto, *data; |
3c0ef626 | 969 | /* Get reasonable local authentication information. */ |
665a873d | 970 | client_x11_get_proto(display, options.xauth_location, |
971 | options.forward_x11_trusted, &proto, &data); | |
3c0ef626 | 972 | /* Request forwarding with authentication spoofing. */ |
973 | debug("Requesting X11 forwarding with authentication spoofing."); | |
665a873d | 974 | x11_request_forwarding_with_spoofing(0, display, proto, data); |
3c0ef626 | 975 | |
976 | /* Read response from the server. */ | |
e9a17296 | 977 | type = packet_read(); |
3c0ef626 | 978 | if (type == SSH_SMSG_SUCCESS) { |
979 | interactive = 1; | |
980 | } else if (type == SSH_SMSG_FAILURE) { | |
0fff78ff | 981 | logit("Warning: Remote host denied X11 forwarding."); |
3c0ef626 | 982 | } else { |
983 | packet_disconnect("Protocol error waiting for X11 forwarding"); | |
984 | } | |
985 | } | |
986 | /* Tell the packet module whether this is an interactive session. */ | |
987 | packet_set_interactive(interactive); | |
988 | ||
989 | /* Request authentication agent forwarding if appropriate. */ | |
990 | check_agent_present(); | |
991 | ||
992 | if (options.forward_agent) { | |
993 | debug("Requesting authentication agent forwarding."); | |
994 | auth_request_forwarding(); | |
995 | ||
996 | /* Read response from the server. */ | |
e9a17296 | 997 | type = packet_read(); |
998 | packet_check_eom(); | |
3c0ef626 | 999 | if (type != SSH_SMSG_SUCCESS) |
0fff78ff | 1000 | logit("Warning: Remote host denied authentication agent forwarding."); |
3c0ef626 | 1001 | } |
1002 | ||
1003 | /* Initiate port forwardings. */ | |
1004 | ssh_init_forwarding(); | |
1005 | ||
47686178 | 1006 | /* Execute a local command */ |
1007 | if (options.local_command != NULL && | |
1008 | options.permit_local_command) | |
1009 | ssh_local_cmd(options.local_command); | |
1010 | ||
3c0ef626 | 1011 | /* If requested, let ssh continue in the background. */ |
1012 | if (fork_after_authentication_flag) | |
1013 | if (daemon(1, 1) < 0) | |
1014 | fatal("daemon() failed: %.200s", strerror(errno)); | |
1015 | ||
1016 | /* | |
1017 | * If a command was specified on the command line, execute the | |
1018 | * command now. Otherwise request the server to start a shell. | |
1019 | */ | |
1020 | if (buffer_len(&command) > 0) { | |
1021 | int len = buffer_len(&command); | |
1022 | if (len > 900) | |
1023 | len = 900; | |
e9a17296 | 1024 | debug("Sending command: %.*s", len, (u_char *)buffer_ptr(&command)); |
3c0ef626 | 1025 | packet_start(SSH_CMSG_EXEC_CMD); |
1026 | packet_put_string(buffer_ptr(&command), buffer_len(&command)); | |
1027 | packet_send(); | |
1028 | packet_write_wait(); | |
1029 | } else { | |
1030 | debug("Requesting shell."); | |
1031 | packet_start(SSH_CMSG_EXEC_SHELL); | |
1032 | packet_send(); | |
1033 | packet_write_wait(); | |
1034 | } | |
1035 | ||
1036 | /* Enter the interactive session. */ | |
1037 | return client_loop(have_tty, tty_flag ? | |
1038 | options.escape_char : SSH_ESCAPECHAR_NONE, 0); | |
1039 | } | |
1040 | ||
1041 | static void | |
c9f39d2c | 1042 | ssh_subsystem_reply(int type, u_int32_t seq, void *ctxt) |
3c0ef626 | 1043 | { |
1044 | int id, len; | |
1045 | ||
1046 | id = packet_get_int(); | |
1047 | len = buffer_len(&command); | |
1048 | if (len > 900) | |
1049 | len = 900; | |
e9a17296 | 1050 | packet_check_eom(); |
3c0ef626 | 1051 | if (type == SSH2_MSG_CHANNEL_FAILURE) |
1052 | fatal("Request for subsystem '%.*s' failed on channel %d", | |
e9a17296 | 1053 | len, (u_char *)buffer_ptr(&command), id); |
3c0ef626 | 1054 | } |
1055 | ||
700318f3 | 1056 | void |
cdd66111 | 1057 | client_global_request_reply_fwd(int type, u_int32_t seq, void *ctxt) |
700318f3 | 1058 | { |
1059 | int i; | |
1060 | ||
1061 | i = client_global_request_id++; | |
cdd66111 | 1062 | if (i >= options.num_remote_forwards) |
700318f3 | 1063 | return; |
700318f3 | 1064 | debug("remote forward %s for: listen %d, connect %s:%d", |
1065 | type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure", | |
996d5e62 | 1066 | options.remote_forwards[i].listen_port, |
1067 | options.remote_forwards[i].connect_host, | |
1068 | options.remote_forwards[i].connect_port); | |
9108f8d9 | 1069 | if (type == SSH2_MSG_REQUEST_FAILURE) { |
1070 | if (options.exit_on_forward_failure) | |
1071 | fatal("Error: remote port forwarding failed for " | |
1072 | "listen port %d", | |
1073 | options.remote_forwards[i].listen_port); | |
1074 | else | |
1075 | logit("Warning: remote port forwarding failed for " | |
1076 | "listen port %d", | |
1077 | options.remote_forwards[i].listen_port); | |
1078 | } | |
700318f3 | 1079 | } |
1080 | ||
3c0ef626 | 1081 | static void |
c9f39d2c | 1082 | ssh_control_listener(void) |
3c0ef626 | 1083 | { |
c9f39d2c | 1084 | struct sockaddr_un addr; |
1085 | mode_t old_umask; | |
1086 | int addr_len; | |
3c0ef626 | 1087 | |
665a873d | 1088 | if (options.control_path == NULL || |
1089 | options.control_master == SSHCTL_MASTER_NO) | |
c9f39d2c | 1090 | return; |
3c0ef626 | 1091 | |
665a873d | 1092 | debug("setting up multiplex master socket"); |
1093 | ||
c9f39d2c | 1094 | memset(&addr, '\0', sizeof(addr)); |
1095 | addr.sun_family = AF_UNIX; | |
1096 | addr_len = offsetof(struct sockaddr_un, sun_path) + | |
1097 | strlen(options.control_path) + 1; | |
3c0ef626 | 1098 | |
c9f39d2c | 1099 | if (strlcpy(addr.sun_path, options.control_path, |
1100 | sizeof(addr.sun_path)) >= sizeof(addr.sun_path)) | |
1101 | fatal("ControlPath too long"); | |
1102 | ||
1103 | if ((control_fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) | |
2c06c99b | 1104 | fatal("%s socket(): %s", __func__, strerror(errno)); |
c9f39d2c | 1105 | |
1106 | old_umask = umask(0177); | |
9108f8d9 | 1107 | if (bind(control_fd, (struct sockaddr *)&addr, addr_len) == -1) { |
c9f39d2c | 1108 | control_fd = -1; |
dec6d9fe | 1109 | if (errno == EINVAL || errno == EADDRINUSE) |
c9f39d2c | 1110 | fatal("ControlSocket %s already exists", |
1111 | options.control_path); | |
1112 | else | |
2c06c99b | 1113 | fatal("%s bind(): %s", __func__, strerror(errno)); |
3c0ef626 | 1114 | } |
c9f39d2c | 1115 | umask(old_umask); |
1116 | ||
1117 | if (listen(control_fd, 64) == -1) | |
2c06c99b | 1118 | fatal("%s listen(): %s", __func__, strerror(errno)); |
c9f39d2c | 1119 | |
1120 | set_nonblock(control_fd); | |
1121 | } | |
1122 | ||
1123 | /* request pty/x11/agent/tcpfwd/shell for channel */ | |
1124 | static void | |
1125 | ssh_session2_setup(int id, void *arg) | |
1126 | { | |
1127 | extern char **environ; | |
665a873d | 1128 | const char *display; |
c9f39d2c | 1129 | int interactive = tty_flag; |
665a873d | 1130 | |
1131 | display = getenv("DISPLAY"); | |
1132 | if (options.forward_x11 && display != NULL) { | |
e9a17296 | 1133 | char *proto, *data; |
3c0ef626 | 1134 | /* Get reasonable local authentication information. */ |
665a873d | 1135 | client_x11_get_proto(display, options.xauth_location, |
1136 | options.forward_x11_trusted, &proto, &data); | |
3c0ef626 | 1137 | /* Request forwarding with authentication spoofing. */ |
1138 | debug("Requesting X11 forwarding with authentication spoofing."); | |
665a873d | 1139 | x11_request_forwarding_with_spoofing(id, display, proto, data); |
3c0ef626 | 1140 | interactive = 1; |
1141 | /* XXX wait for reply */ | |
1142 | } | |
1143 | ||
1144 | check_agent_present(); | |
1145 | if (options.forward_agent) { | |
1146 | debug("Requesting authentication agent forwarding."); | |
1147 | channel_request_start(id, "auth-agent-req@openssh.com", 0); | |
1148 | packet_send(); | |
1149 | } | |
1150 | ||
c9f39d2c | 1151 | client_session2_setup(id, tty_flag, subsystem_flag, getenv("TERM"), |
1152 | NULL, fileno(stdin), &command, environ, &ssh_subsystem_reply); | |
3c0ef626 | 1153 | |
3c0ef626 | 1154 | packet_set_interactive(interactive); |
1155 | } | |
1156 | ||
1157 | /* open new channel for a session */ | |
1158 | static int | |
1159 | ssh_session2_open(void) | |
1160 | { | |
1161 | Channel *c; | |
1162 | int window, packetmax, in, out, err; | |
1163 | ||
1164 | if (stdin_null_flag) { | |
1165 | in = open(_PATH_DEVNULL, O_RDONLY); | |
1166 | } else { | |
1167 | in = dup(STDIN_FILENO); | |
1168 | } | |
1169 | out = dup(STDOUT_FILENO); | |
1170 | err = dup(STDERR_FILENO); | |
1171 | ||
1172 | if (in < 0 || out < 0 || err < 0) | |
1173 | fatal("dup() in/out/err failed"); | |
1174 | ||
1175 | /* enable nonblocking unless tty */ | |
1176 | if (!isatty(in)) | |
1177 | set_nonblock(in); | |
1178 | if (!isatty(out)) | |
1179 | set_nonblock(out); | |
1180 | if (!isatty(err)) | |
1181 | set_nonblock(err); | |
1182 | ||
1183 | window = CHAN_SES_WINDOW_DEFAULT; | |
1184 | packetmax = CHAN_SES_PACKET_DEFAULT; | |
e9a17296 | 1185 | if (tty_flag) { |
1186 | window >>= 1; | |
1187 | packetmax >>= 1; | |
3c0ef626 | 1188 | } |
1189 | c = channel_new( | |
1190 | "session", SSH_CHANNEL_OPENING, in, out, err, | |
1191 | window, packetmax, CHAN_EXTENDED_WRITE, | |
0fff78ff | 1192 | "client-session", /*nonblock*/0); |
3c0ef626 | 1193 | |
1194 | debug3("ssh_session2_open: channel_new: %d", c->self); | |
1195 | ||
1196 | channel_send_open(c->self); | |
1197 | if (!no_shell_flag) | |
c9f39d2c | 1198 | channel_register_confirm(c->self, ssh_session2_setup, NULL); |
3c0ef626 | 1199 | |
1200 | return c->self; | |
1201 | } | |
1202 | ||
1203 | static int | |
1204 | ssh_session2(void) | |
1205 | { | |
1206 | int id = -1; | |
1207 | ||
1208 | /* XXX should be pre-session */ | |
1209 | ssh_init_forwarding(); | |
1210 | ||
1211 | if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN)) | |
1212 | id = ssh_session2_open(); | |
1213 | ||
2c06c99b | 1214 | /* Execute a local command */ |
1215 | if (options.local_command != NULL && | |
1216 | options.permit_local_command) | |
1217 | ssh_local_cmd(options.local_command); | |
1218 | ||
d4487008 | 1219 | /* Start listening for multiplex clients */ |
1220 | ssh_control_listener(); | |
1221 | ||
3c0ef626 | 1222 | /* If requested, let ssh continue in the background. */ |
1223 | if (fork_after_authentication_flag) | |
1224 | if (daemon(1, 1) < 0) | |
1225 | fatal("daemon() failed: %.200s", strerror(errno)); | |
1226 | ||
1227 | return client_loop(tty_flag, tty_flag ? | |
1228 | options.escape_char : SSH_ESCAPECHAR_NONE, id); | |
1229 | } | |
1230 | ||
1231 | static void | |
1232 | load_public_identity_files(void) | |
1233 | { | |
9108f8d9 | 1234 | char *filename, *cp, thishost[NI_MAXHOST]; |
47686178 | 1235 | char *pwdir = NULL, *pwname = NULL; |
3c0ef626 | 1236 | int i = 0; |
700318f3 | 1237 | Key *public; |
9108f8d9 | 1238 | struct passwd *pw; |
3c0ef626 | 1239 | #ifdef SMARTCARD |
700318f3 | 1240 | Key **keys; |
1241 | ||
3c0ef626 | 1242 | if (options.smartcard_device != NULL && |
700318f3 | 1243 | options.num_identity_files < SSH_MAX_IDENTITY_FILES && |
9108f8d9 | 1244 | (keys = sc_get_keys(options.smartcard_device, NULL)) != NULL) { |
700318f3 | 1245 | int count = 0; |
1246 | for (i = 0; keys[i] != NULL; i++) { | |
1247 | count++; | |
1248 | memmove(&options.identity_files[1], &options.identity_files[0], | |
1249 | sizeof(char *) * (SSH_MAX_IDENTITY_FILES - 1)); | |
1250 | memmove(&options.identity_keys[1], &options.identity_keys[0], | |
1251 | sizeof(Key *) * (SSH_MAX_IDENTITY_FILES - 1)); | |
1252 | options.num_identity_files++; | |
1253 | options.identity_keys[0] = keys[i]; | |
0fff78ff | 1254 | options.identity_files[0] = sc_get_key_label(keys[i]); |
700318f3 | 1255 | } |
1256 | if (options.num_identity_files > SSH_MAX_IDENTITY_FILES) | |
1257 | options.num_identity_files = SSH_MAX_IDENTITY_FILES; | |
1258 | i = count; | |
1259 | xfree(keys); | |
3c0ef626 | 1260 | } |
1261 | #endif /* SMARTCARD */ | |
9108f8d9 | 1262 | if ((pw = getpwuid(original_real_uid)) == NULL) |
1263 | fatal("load_public_identity_files: getpwuid failed"); | |
47686178 | 1264 | pwname = xstrdup(pw->pw_name); |
1265 | pwdir = xstrdup(pw->pw_dir); | |
9108f8d9 | 1266 | if (gethostname(thishost, sizeof(thishost)) == -1) |
1267 | fatal("load_public_identity_files: gethostname: %s", | |
1268 | strerror(errno)); | |
3c0ef626 | 1269 | for (; i < options.num_identity_files; i++) { |
9108f8d9 | 1270 | cp = tilde_expand_filename(options.identity_files[i], |
3c0ef626 | 1271 | original_real_uid); |
47686178 | 1272 | filename = percent_expand(cp, "d", pwdir, |
1273 | "u", pwname, "l", thishost, "h", host, | |
9108f8d9 | 1274 | "r", options.user, (char *)NULL); |
1275 | xfree(cp); | |
3c0ef626 | 1276 | public = key_load_public(filename, NULL); |
1277 | debug("identity file %s type %d", filename, | |
1278 | public ? public->type : -1); | |
1279 | xfree(options.identity_files[i]); | |
1280 | options.identity_files[i] = filename; | |
1281 | options.identity_keys[i] = public; | |
1282 | } | |
47686178 | 1283 | bzero(pwname, strlen(pwname)); |
1284 | xfree(pwname); | |
1285 | bzero(pwdir, strlen(pwdir)); | |
1286 | xfree(pwdir); | |
3c0ef626 | 1287 | } |
c9f39d2c | 1288 | |
1289 | static void | |
1290 | control_client_sighandler(int signo) | |
1291 | { | |
1292 | control_client_terminate = signo; | |
1293 | } | |
1294 | ||
1295 | static void | |
1296 | control_client_sigrelay(int signo) | |
1297 | { | |
47686178 | 1298 | int save_errno = errno; |
1299 | ||
c9f39d2c | 1300 | if (control_server_pid > 1) |
1301 | kill(control_server_pid, signo); | |
47686178 | 1302 | |
1303 | errno = save_errno; | |
c9f39d2c | 1304 | } |
1305 | ||
1306 | static int | |
1307 | env_permitted(char *env) | |
1308 | { | |
9108f8d9 | 1309 | int i, ret; |
c9f39d2c | 1310 | char name[1024], *cp; |
1311 | ||
9108f8d9 | 1312 | if ((cp = strchr(env, '=')) == NULL || cp == env) |
c9f39d2c | 1313 | return (0); |
9108f8d9 | 1314 | ret = snprintf(name, sizeof(name), "%.*s", (int)(cp - env), env); |
1315 | if (ret <= 0 || (size_t)ret >= sizeof(name)) | |
1316 | fatal("env_permitted: name '%.100s...' too long", env); | |
c9f39d2c | 1317 | |
1318 | for (i = 0; i < options.num_send_env; i++) | |
1319 | if (match_pattern(name, options.send_env[i])) | |
1320 | return (1); | |
1321 | ||
1322 | return (0); | |
1323 | } | |
1324 | ||
1325 | static void | |
1326 | control_client(const char *path) | |
1327 | { | |
1328 | struct sockaddr_un addr; | |
d4487008 | 1329 | int i, r, fd, sock, exitval[2], num_env, addr_len; |
c9f39d2c | 1330 | Buffer m; |
996d5e62 | 1331 | char *term; |
c9f39d2c | 1332 | extern char **environ; |
996d5e62 | 1333 | u_int flags; |
1334 | ||
665a873d | 1335 | if (mux_command == 0) |
1336 | mux_command = SSHMUX_COMMAND_OPEN; | |
1337 | ||
1338 | switch (options.control_master) { | |
1339 | case SSHCTL_MASTER_AUTO: | |
1340 | case SSHCTL_MASTER_AUTO_ASK: | |
1341 | debug("auto-mux: Trying existing master"); | |
1342 | /* FALLTHROUGH */ | |
1343 | case SSHCTL_MASTER_NO: | |
1344 | break; | |
1345 | default: | |
1346 | return; | |
996d5e62 | 1347 | } |
c9f39d2c | 1348 | |
1349 | memset(&addr, '\0', sizeof(addr)); | |
1350 | addr.sun_family = AF_UNIX; | |
1351 | addr_len = offsetof(struct sockaddr_un, sun_path) + | |
1352 | strlen(path) + 1; | |
1353 | ||
1354 | if (strlcpy(addr.sun_path, path, | |
1355 | sizeof(addr.sun_path)) >= sizeof(addr.sun_path)) | |
1356 | fatal("ControlPath too long"); | |
1357 | ||
1358 | if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) | |
1359 | fatal("%s socket(): %s", __func__, strerror(errno)); | |
1360 | ||
9108f8d9 | 1361 | if (connect(sock, (struct sockaddr *)&addr, addr_len) == -1) { |
665a873d | 1362 | if (mux_command != SSHMUX_COMMAND_OPEN) { |
1363 | fatal("Control socket connect(%.100s): %s", path, | |
1364 | strerror(errno)); | |
1365 | } | |
1366 | if (errno == ENOENT) | |
9108f8d9 | 1367 | debug("Control socket \"%.100s\" does not exist", path); |
665a873d | 1368 | else { |
9108f8d9 | 1369 | error("Control socket connect(%.100s): %s", path, |
665a873d | 1370 | strerror(errno)); |
1371 | } | |
9108f8d9 | 1372 | close(sock); |
1373 | return; | |
1374 | } | |
1375 | ||
1376 | if (stdin_null_flag) { | |
1377 | if ((fd = open(_PATH_DEVNULL, O_RDONLY)) == -1) | |
1378 | fatal("open(/dev/null): %s", strerror(errno)); | |
1379 | if (dup2(fd, STDIN_FILENO) == -1) | |
1380 | fatal("dup2: %s", strerror(errno)); | |
1381 | if (fd > STDERR_FILENO) | |
1382 | close(fd); | |
1383 | } | |
c9f39d2c | 1384 | |
665a873d | 1385 | term = getenv("TERM"); |
996d5e62 | 1386 | |
1387 | flags = 0; | |
1388 | if (tty_flag) | |
1389 | flags |= SSHMUX_FLAG_TTY; | |
1390 | if (subsystem_flag) | |
1391 | flags |= SSHMUX_FLAG_SUBSYS; | |
665a873d | 1392 | if (options.forward_x11) |
1393 | flags |= SSHMUX_FLAG_X11_FWD; | |
1394 | if (options.forward_agent) | |
1395 | flags |= SSHMUX_FLAG_AGENT_FWD; | |
c9f39d2c | 1396 | |
47686178 | 1397 | signal(SIGPIPE, SIG_IGN); |
1398 | ||
c9f39d2c | 1399 | buffer_init(&m); |
1400 | ||
996d5e62 | 1401 | /* Send our command to server */ |
1402 | buffer_put_int(&m, mux_command); | |
1403 | buffer_put_int(&m, flags); | |
665a873d | 1404 | if (ssh_msg_send(sock, SSHMUX_VER, &m) == -1) |
996d5e62 | 1405 | fatal("%s: msg_send", __func__); |
1406 | buffer_clear(&m); | |
1407 | ||
1408 | /* Get authorisation status and PID of controlee */ | |
c9f39d2c | 1409 | if (ssh_msg_recv(sock, &m) == -1) |
1410 | fatal("%s: msg_recv", __func__); | |
665a873d | 1411 | if (buffer_get_char(&m) != SSHMUX_VER) |
c9f39d2c | 1412 | fatal("%s: wrong version", __func__); |
c9f39d2c | 1413 | if (buffer_get_int(&m) != 1) |
1414 | fatal("Connection to master denied"); | |
1415 | control_server_pid = buffer_get_int(&m); | |
1416 | ||
1417 | buffer_clear(&m); | |
c9f39d2c | 1418 | |
996d5e62 | 1419 | switch (mux_command) { |
1420 | case SSHMUX_COMMAND_ALIVE_CHECK: | |
dec6d9fe | 1421 | fprintf(stderr, "Master running (pid=%d)\r\n", |
996d5e62 | 1422 | control_server_pid); |
1423 | exit(0); | |
1424 | case SSHMUX_COMMAND_TERMINATE: | |
1425 | fprintf(stderr, "Exit request sent.\r\n"); | |
1426 | exit(0); | |
1427 | case SSHMUX_COMMAND_OPEN: | |
1428 | /* continue below */ | |
1429 | break; | |
1430 | default: | |
1431 | fatal("silly mux_command %d", mux_command); | |
1432 | } | |
1433 | ||
1434 | /* SSHMUX_COMMAND_OPEN */ | |
665a873d | 1435 | buffer_put_cstring(&m, term ? term : ""); |
c9f39d2c | 1436 | buffer_append(&command, "\0", 1); |
1437 | buffer_put_cstring(&m, buffer_ptr(&command)); | |
1438 | ||
1439 | if (options.num_send_env == 0 || environ == NULL) { | |
1440 | buffer_put_int(&m, 0); | |
1441 | } else { | |
1442 | /* Pass environment */ | |
1443 | num_env = 0; | |
1444 | for (i = 0; environ[i] != NULL; i++) | |
1445 | if (env_permitted(environ[i])) | |
1446 | num_env++; /* Count */ | |
1447 | ||
1448 | buffer_put_int(&m, num_env); | |
1449 | ||
1450 | for (i = 0; environ[i] != NULL && num_env >= 0; i++) | |
1451 | if (env_permitted(environ[i])) { | |
1452 | num_env--; | |
1453 | buffer_put_cstring(&m, environ[i]); | |
1454 | } | |
1455 | } | |
1456 | ||
665a873d | 1457 | if (ssh_msg_send(sock, SSHMUX_VER, &m) == -1) |
c9f39d2c | 1458 | fatal("%s: msg_send", __func__); |
1459 | ||
47686178 | 1460 | if (mm_send_fd(sock, STDIN_FILENO) == -1 || |
1461 | mm_send_fd(sock, STDOUT_FILENO) == -1 || | |
1462 | mm_send_fd(sock, STDERR_FILENO) == -1) | |
1463 | fatal("%s: send fds failed", __func__); | |
c9f39d2c | 1464 | |
1465 | /* Wait for reply, so master has a chance to gather ttymodes */ | |
1466 | buffer_clear(&m); | |
1467 | if (ssh_msg_recv(sock, &m) == -1) | |
1468 | fatal("%s: msg_recv", __func__); | |
665a873d | 1469 | if (buffer_get_char(&m) != SSHMUX_VER) |
996d5e62 | 1470 | fatal("%s: wrong version", __func__); |
c9f39d2c | 1471 | buffer_free(&m); |
1472 | ||
996d5e62 | 1473 | signal(SIGHUP, control_client_sighandler); |
c9f39d2c | 1474 | signal(SIGINT, control_client_sighandler); |
1475 | signal(SIGTERM, control_client_sighandler); | |
1476 | signal(SIGWINCH, control_client_sigrelay); | |
1477 | ||
1478 | if (tty_flag) | |
1479 | enter_raw_mode(); | |
1480 | ||
d4487008 | 1481 | /* |
1482 | * Stick around until the controlee closes the client_fd. | |
1483 | * Before it does, it is expected to write this process' exit | |
1484 | * value (one int). This process must read the value and wait for | |
1485 | * the closure of the client_fd; if this one closes early, the | |
1486 | * multiplex master will terminate early too (possibly losing data). | |
1487 | */ | |
1488 | exitval[0] = 0; | |
1489 | for (i = 0; !control_client_terminate && i < (int)sizeof(exitval);) { | |
1490 | r = read(sock, (char *)exitval + i, sizeof(exitval) - i); | |
c9f39d2c | 1491 | if (r == 0) { |
1492 | debug2("Received EOF from master"); | |
1493 | break; | |
1494 | } | |
d4487008 | 1495 | if (r == -1) { |
1496 | if (errno == EINTR) | |
1497 | continue; | |
c9f39d2c | 1498 | fatal("%s: read %s", __func__, strerror(errno)); |
d4487008 | 1499 | } |
1500 | i += r; | |
c9f39d2c | 1501 | } |
1502 | ||
c9f39d2c | 1503 | close(sock); |
c9f39d2c | 1504 | leave_raw_mode(); |
d4487008 | 1505 | if (i > (int)sizeof(int)) |
1506 | fatal("%s: master returned too much data (%d > %lu)", | |
1507 | __func__, i, sizeof(int)); | |
1508 | if (control_client_terminate) { | |
1509 | debug2("Exiting on signal %d", control_client_terminate); | |
1510 | exitval[0] = 255; | |
1511 | } else if (i < (int)sizeof(int)) { | |
1512 | debug2("Control master terminated unexpectedly"); | |
1513 | exitval[0] = 255; | |
1514 | } else | |
1515 | debug2("Received exit status from master %d", exitval[0]); | |
c9f39d2c | 1516 | |
1517 | if (tty_flag && options.log_level != SYSLOG_LEVEL_QUIET) | |
d4487008 | 1518 | fprintf(stderr, "Shared connection to %s closed.\r\n", host); |
c9f39d2c | 1519 | |
d4487008 | 1520 | exit(exitval[0]); |
c9f39d2c | 1521 | } |