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3d738e65 | 1 | /* $OpenBSD: ssh.c,v 1.326 2009/07/02 02:11:47 dtucker 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> | |
3d738e65 | 51 | #include <sys/param.h> |
9108f8d9 | 52 | #include <sys/socket.h> |
9108f8d9 | 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" |
22616013 | 76 | #include "openbsd-compat/sys-queue.h" |
3c0ef626 | 77 | |
9108f8d9 | 78 | #include "xmalloc.h" |
3c0ef626 | 79 | #include "ssh.h" |
80 | #include "ssh1.h" | |
81 | #include "ssh2.h" | |
82 | #include "compat.h" | |
83 | #include "cipher.h" | |
3c0ef626 | 84 | #include "packet.h" |
85 | #include "buffer.h" | |
3c0ef626 | 86 | #include "channels.h" |
87 | #include "key.h" | |
88 | #include "authfd.h" | |
89 | #include "authfile.h" | |
90 | #include "pathnames.h" | |
c9f39d2c | 91 | #include "dispatch.h" |
3c0ef626 | 92 | #include "clientloop.h" |
93 | #include "log.h" | |
94 | #include "readconf.h" | |
95 | #include "sshconnect.h" | |
3c0ef626 | 96 | #include "misc.h" |
97 | #include "kex.h" | |
98 | #include "mac.h" | |
c9f39d2c | 99 | #include "sshpty.h" |
100 | #include "match.h" | |
101 | #include "msg.h" | |
c9f39d2c | 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 | |
22616013 | 111 | /* Flag indicating whether debug mode is on. May be set on the command line. */ |
3c0ef626 | 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 */ |
22616013 | 168 | static int remote_forward_confirms_received = 0; |
700318f3 | 169 | |
41b2f314 | 170 | /* pid of proxycommand child process */ |
171 | pid_t proxy_command_pid = 0; | |
172 | ||
22616013 | 173 | /* mux.c */ |
174 | extern int muxserver_sock; | |
175 | extern u_int muxclient_command; | |
c9f39d2c | 176 | |
3c0ef626 | 177 | /* Prints a help message to the user. This function never returns. */ |
178 | ||
179 | static void | |
180 | usage(void) | |
181 | { | |
99be0775 | 182 | fprintf(stderr, |
91d9cdd3 | 183 | "usage: ssh [-1246AaCfgKkMNnqsTtVvXxYy] [-b bind_address] [-c cipher_spec]\n" |
2c06c99b | 184 | " [-D [bind_address:]port] [-e escape_char] [-F configfile]\n" |
996d5e62 | 185 | " [-i identity_file] [-L [bind_address:]port:host:hostport]\n" |
186 | " [-l login_name] [-m mac_spec] [-O ctl_cmd] [-o option] [-p port]\n" | |
187 | " [-R [bind_address:]port:host:hostport] [-S ctl_path]\n" | |
9108f8d9 | 188 | " [-w local_tun[:remote_tun]] [user@]hostname [command]\n" |
99be0775 | 189 | ); |
2c06c99b | 190 | exit(255); |
3c0ef626 | 191 | } |
192 | ||
3c0ef626 | 193 | static int ssh_session(void); |
194 | static int ssh_session2(void); | |
195 | static void load_public_identity_files(void); | |
22616013 | 196 | |
197 | /* from muxclient.c */ | |
198 | void muxclient(const char *); | |
199 | void muxserver_listen(void); | |
3c0ef626 | 200 | |
201 | /* | |
202 | * Main program for the ssh client. | |
203 | */ | |
204 | int | |
205 | main(int ac, char **av) | |
206 | { | |
3d738e65 | 207 | int i, r, opt, exit_status, use_syslog; |
208 | char *p, *cp, *line, *argv0, buf[MAXPATHLEN]; | |
3c0ef626 | 209 | struct stat st; |
210 | struct passwd *pw; | |
47686178 | 211 | int dummy, timeout_ms; |
3c0ef626 | 212 | extern int optind, optreset; |
213 | extern char *optarg; | |
665a873d | 214 | struct servent *sp; |
996d5e62 | 215 | Forward fwd; |
3c0ef626 | 216 | |
2c06c99b | 217 | /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ |
218 | sanitise_stdfd(); | |
219 | ||
0fff78ff | 220 | __progname = ssh_get_progname(av[0]); |
3c0ef626 | 221 | init_rng(); |
222 | ||
223 | /* | |
224 | * Save the original real uid. It will be needed later (uid-swapping | |
225 | * may clobber the real uid). | |
226 | */ | |
227 | original_real_uid = getuid(); | |
228 | original_effective_uid = geteuid(); | |
cdd66111 | 229 | |
41b2f314 | 230 | /* |
231 | * Use uid-swapping to give up root privileges for the duration of | |
232 | * option processing. We will re-instantiate the rights when we are | |
233 | * ready to create the privileged port, and will permanently drop | |
234 | * them when the port has been created (actually, when the connection | |
235 | * has been made, as we may need to create the port several times). | |
236 | */ | |
237 | PRIV_END; | |
3c0ef626 | 238 | |
239 | #ifdef HAVE_SETRLIMIT | |
240 | /* If we are installed setuid root be careful to not drop core. */ | |
241 | if (original_real_uid != original_effective_uid) { | |
242 | struct rlimit rlim; | |
243 | rlim.rlim_cur = rlim.rlim_max = 0; | |
244 | if (setrlimit(RLIMIT_CORE, &rlim) < 0) | |
245 | fatal("setrlimit failed: %.100s", strerror(errno)); | |
246 | } | |
247 | #endif | |
248 | /* Get user data. */ | |
249 | pw = getpwuid(original_real_uid); | |
250 | if (!pw) { | |
0fff78ff | 251 | logit("You don't exist, go away!"); |
2c06c99b | 252 | exit(255); |
3c0ef626 | 253 | } |
254 | /* Take a copy of the returned structure. */ | |
255 | pw = pwcopy(pw); | |
256 | ||
3c0ef626 | 257 | /* |
258 | * Set our umask to something reasonable, as some files are created | |
259 | * with the default umask. This will make them world-readable but | |
260 | * writable only by the owner, which is ok for all files for which we | |
261 | * don't set the modes explicitly. | |
262 | */ | |
263 | umask(022); | |
264 | ||
22616013 | 265 | /* |
266 | * Initialize option structure to indicate that no values have been | |
267 | * set. | |
268 | */ | |
3c0ef626 | 269 | initialize_options(&options); |
270 | ||
271 | /* Parse command-line arguments. */ | |
272 | host = NULL; | |
91d9cdd3 | 273 | use_syslog = 0; |
3d738e65 | 274 | argv0 = av[0]; |
3c0ef626 | 275 | |
9108f8d9 | 276 | again: |
22616013 | 277 | while ((opt = getopt(ac, av, "1246ab:c:e:fgi:kl:m:no:p:qstvx" |
91d9cdd3 | 278 | "ACD:F:I:KL:MNO:PR:S:TVw:XYy")) != -1) { |
3c0ef626 | 279 | switch (opt) { |
280 | case '1': | |
281 | options.protocol = SSH_PROTO_1; | |
282 | break; | |
283 | case '2': | |
284 | options.protocol = SSH_PROTO_2; | |
285 | break; | |
286 | case '4': | |
0fff78ff | 287 | options.address_family = AF_INET; |
3c0ef626 | 288 | break; |
289 | case '6': | |
0fff78ff | 290 | options.address_family = AF_INET6; |
3c0ef626 | 291 | break; |
292 | case 'n': | |
293 | stdin_null_flag = 1; | |
294 | break; | |
295 | case 'f': | |
296 | fork_after_authentication_flag = 1; | |
297 | stdin_null_flag = 1; | |
298 | break; | |
299 | case 'x': | |
300 | options.forward_x11 = 0; | |
301 | break; | |
302 | case 'X': | |
303 | options.forward_x11 = 1; | |
304 | break; | |
91d9cdd3 | 305 | case 'y': |
306 | use_syslog = 1; | |
307 | break; | |
cdd66111 | 308 | case 'Y': |
309 | options.forward_x11 = 1; | |
310 | options.forward_x11_trusted = 1; | |
311 | break; | |
3c0ef626 | 312 | case 'g': |
313 | options.gateway_ports = 1; | |
314 | break; | |
996d5e62 | 315 | case 'O': |
316 | if (strcmp(optarg, "check") == 0) | |
22616013 | 317 | muxclient_command = SSHMUX_COMMAND_ALIVE_CHECK; |
996d5e62 | 318 | else if (strcmp(optarg, "exit") == 0) |
22616013 | 319 | muxclient_command = SSHMUX_COMMAND_TERMINATE; |
996d5e62 | 320 | else |
321 | fatal("Invalid multiplex command."); | |
322 | break; | |
41b2f314 | 323 | case 'P': /* deprecated */ |
3c0ef626 | 324 | options.use_privileged_port = 0; |
325 | break; | |
326 | case 'a': | |
327 | options.forward_agent = 0; | |
328 | break; | |
329 | case 'A': | |
330 | options.forward_agent = 1; | |
331 | break; | |
3c0ef626 | 332 | case 'k': |
cdd66111 | 333 | options.gss_deleg_creds = 0; |
3c0ef626 | 334 | break; |
d4487008 | 335 | case 'K': |
336 | options.gss_authentication = 1; | |
337 | options.gss_deleg_creds = 1; | |
338 | break; | |
3c0ef626 | 339 | case 'i': |
340 | if (stat(optarg, &st) < 0) { | |
341 | fprintf(stderr, "Warning: Identity file %s " | |
996d5e62 | 342 | "not accessible: %s.\n", optarg, |
343 | strerror(errno)); | |
3c0ef626 | 344 | break; |
345 | } | |
346 | if (options.num_identity_files >= | |
347 | SSH_MAX_IDENTITY_FILES) | |
348 | fatal("Too many identity files specified " | |
349 | "(max %d)", SSH_MAX_IDENTITY_FILES); | |
350 | options.identity_files[options.num_identity_files++] = | |
351 | xstrdup(optarg); | |
352 | break; | |
353 | case 'I': | |
354 | #ifdef SMARTCARD | |
355 | options.smartcard_device = xstrdup(optarg); | |
356 | #else | |
357 | fprintf(stderr, "no support for smartcards.\n"); | |
358 | #endif | |
359 | break; | |
360 | case 't': | |
361 | if (tty_flag) | |
362 | force_tty_flag = 1; | |
363 | tty_flag = 1; | |
364 | break; | |
365 | case 'v': | |
0fff78ff | 366 | if (debug_flag == 0) { |
3c0ef626 | 367 | debug_flag = 1; |
368 | options.log_level = SYSLOG_LEVEL_DEBUG1; | |
0fff78ff | 369 | } else { |
370 | if (options.log_level < SYSLOG_LEVEL_DEBUG3) | |
371 | options.log_level++; | |
3c0ef626 | 372 | break; |
0fff78ff | 373 | } |
996d5e62 | 374 | /* FALLTHROUGH */ |
3c0ef626 | 375 | case 'V': |
99be0775 | 376 | fprintf(stderr, "%s, %s\n", |
996d5e62 | 377 | SSH_RELEASE, SSLeay_version(SSLEAY_VERSION)); |
3c0ef626 | 378 | if (opt == 'V') |
379 | exit(0); | |
380 | break; | |
2c06c99b | 381 | case 'w': |
382 | if (options.tun_open == -1) | |
383 | options.tun_open = SSH_TUNMODE_DEFAULT; | |
384 | options.tun_local = a2tun(optarg, &options.tun_remote); | |
385 | if (options.tun_local == SSH_TUNID_ERR) { | |
22616013 | 386 | fprintf(stderr, |
387 | "Bad tun device '%s'\n", optarg); | |
2c06c99b | 388 | exit(255); |
389 | } | |
390 | break; | |
3c0ef626 | 391 | case 'q': |
392 | options.log_level = SYSLOG_LEVEL_QUIET; | |
393 | break; | |
394 | case 'e': | |
395 | if (optarg[0] == '^' && optarg[2] == 0 && | |
396 | (u_char) optarg[1] >= 64 && | |
397 | (u_char) optarg[1] < 128) | |
398 | options.escape_char = (u_char) optarg[1] & 31; | |
399 | else if (strlen(optarg) == 1) | |
400 | options.escape_char = (u_char) optarg[0]; | |
401 | else if (strcmp(optarg, "none") == 0) | |
402 | options.escape_char = SSH_ESCAPECHAR_NONE; | |
403 | else { | |
404 | fprintf(stderr, "Bad escape character '%s'.\n", | |
405 | optarg); | |
2c06c99b | 406 | exit(255); |
3c0ef626 | 407 | } |
408 | break; | |
409 | case 'c': | |
410 | if (ciphers_valid(optarg)) { | |
411 | /* SSH2 only */ | |
412 | options.ciphers = xstrdup(optarg); | |
c9f39d2c | 413 | options.cipher = SSH_CIPHER_INVALID; |
3c0ef626 | 414 | } else { |
415 | /* SSH1 only */ | |
416 | options.cipher = cipher_number(optarg); | |
417 | if (options.cipher == -1) { | |
418 | fprintf(stderr, | |
419 | "Unknown cipher type '%s'\n", | |
420 | optarg); | |
2c06c99b | 421 | exit(255); |
3c0ef626 | 422 | } |
423 | if (options.cipher == SSH_CIPHER_3DES) | |
424 | options.ciphers = "3des-cbc"; | |
425 | else if (options.cipher == SSH_CIPHER_BLOWFISH) | |
426 | options.ciphers = "blowfish-cbc"; | |
427 | else | |
428 | options.ciphers = (char *)-1; | |
429 | } | |
430 | break; | |
431 | case 'm': | |
432 | if (mac_valid(optarg)) | |
433 | options.macs = xstrdup(optarg); | |
434 | else { | |
435 | fprintf(stderr, "Unknown mac type '%s'\n", | |
436 | optarg); | |
2c06c99b | 437 | exit(255); |
3c0ef626 | 438 | } |
439 | break; | |
c9f39d2c | 440 | case 'M': |
665a873d | 441 | if (options.control_master == SSHCTL_MASTER_YES) |
442 | options.control_master = SSHCTL_MASTER_ASK; | |
443 | else | |
444 | options.control_master = SSHCTL_MASTER_YES; | |
c9f39d2c | 445 | break; |
3c0ef626 | 446 | case 'p': |
447 | options.port = a2port(optarg); | |
91d9cdd3 | 448 | if (options.port <= 0) { |
3c0ef626 | 449 | fprintf(stderr, "Bad port '%s'\n", optarg); |
2c06c99b | 450 | exit(255); |
3c0ef626 | 451 | } |
452 | break; | |
453 | case 'l': | |
454 | options.user = optarg; | |
455 | break; | |
456 | ||
457 | case 'L': | |
91d9cdd3 | 458 | if (parse_forward(&fwd, optarg, 0, 0)) |
996d5e62 | 459 | add_local_forward(&options, &fwd); |
460 | else { | |
3c0ef626 | 461 | fprintf(stderr, |
996d5e62 | 462 | "Bad local forwarding specification '%s'\n", |
3c0ef626 | 463 | optarg); |
2c06c99b | 464 | exit(255); |
3c0ef626 | 465 | } |
996d5e62 | 466 | break; |
467 | ||
468 | case 'R': | |
91d9cdd3 | 469 | if (parse_forward(&fwd, optarg, 0, 1)) { |
996d5e62 | 470 | add_remote_forward(&options, &fwd); |
471 | } else { | |
3c0ef626 | 472 | fprintf(stderr, |
996d5e62 | 473 | "Bad remote forwarding specification " |
474 | "'%s'\n", optarg); | |
2c06c99b | 475 | exit(255); |
3c0ef626 | 476 | } |
3c0ef626 | 477 | break; |
478 | ||
479 | case 'D': | |
91d9cdd3 | 480 | if (parse_forward(&fwd, optarg, 1, 0)) { |
481 | add_local_forward(&options, &fwd); | |
996d5e62 | 482 | } else { |
91d9cdd3 | 483 | fprintf(stderr, |
484 | "Bad dynamic forwarding specification " | |
485 | "'%s'\n", optarg); | |
2c06c99b | 486 | exit(255); |
3c0ef626 | 487 | } |
3c0ef626 | 488 | break; |
489 | ||
490 | case 'C': | |
491 | options.compression = 1; | |
492 | break; | |
493 | case 'N': | |
494 | no_shell_flag = 1; | |
495 | no_tty_flag = 1; | |
496 | break; | |
497 | case 'T': | |
498 | no_tty_flag = 1; | |
499 | break; | |
500 | case 'o': | |
501 | dummy = 1; | |
cdd66111 | 502 | line = xstrdup(optarg); |
3c0ef626 | 503 | if (process_config_line(&options, host ? host : "", |
cdd66111 | 504 | line, "command-line", 0, &dummy) != 0) |
2c06c99b | 505 | exit(255); |
cdd66111 | 506 | xfree(line); |
3c0ef626 | 507 | break; |
508 | case 's': | |
509 | subsystem_flag = 1; | |
510 | break; | |
c9f39d2c | 511 | case 'S': |
512 | if (options.control_path != NULL) | |
513 | free(options.control_path); | |
514 | options.control_path = xstrdup(optarg); | |
515 | break; | |
3c0ef626 | 516 | case 'b': |
517 | options.bind_address = optarg; | |
518 | break; | |
519 | case 'F': | |
520 | config = optarg; | |
521 | break; | |
522 | default: | |
523 | usage(); | |
524 | } | |
525 | } | |
526 | ||
527 | ac -= optind; | |
528 | av += optind; | |
529 | ||
530 | if (ac > 0 && !host && **av != '-') { | |
6a9b3198 | 531 | if (strrchr(*av, '@')) { |
3c0ef626 | 532 | p = xstrdup(*av); |
6a9b3198 | 533 | cp = strrchr(p, '@'); |
3c0ef626 | 534 | if (cp == NULL || cp == p) |
535 | usage(); | |
536 | options.user = p; | |
537 | *cp = '\0'; | |
538 | host = ++cp; | |
539 | } else | |
540 | host = *av; | |
6a9b3198 | 541 | if (ac > 1) { |
542 | optind = optreset = 1; | |
3c0ef626 | 543 | goto again; |
544 | } | |
6a9b3198 | 545 | ac--, av++; |
3c0ef626 | 546 | } |
547 | ||
548 | /* Check that we got a host name. */ | |
549 | if (!host) | |
550 | usage(); | |
551 | ||
552 | SSLeay_add_all_algorithms(); | |
553 | ERR_load_crypto_strings(); | |
3c0ef626 | 554 | |
555 | /* Initialize the command to execute on remote host. */ | |
556 | buffer_init(&command); | |
557 | ||
558 | /* | |
559 | * Save the command to execute on the remote host in a buffer. There | |
560 | * is no limit on the length of the command, except by the maximum | |
561 | * packet size. Also sets the tty flag if there is no command. | |
562 | */ | |
563 | if (!ac) { | |
564 | /* No command specified - execute shell on a tty. */ | |
565 | tty_flag = 1; | |
566 | if (subsystem_flag) { | |
567 | fprintf(stderr, | |
568 | "You must specify a subsystem to invoke.\n"); | |
569 | usage(); | |
570 | } | |
571 | } else { | |
572 | /* A command has been specified. Store it into the buffer. */ | |
573 | for (i = 0; i < ac; i++) { | |
574 | if (i) | |
575 | buffer_append(&command, " ", 1); | |
576 | buffer_append(&command, av[i], strlen(av[i])); | |
577 | } | |
578 | } | |
579 | ||
580 | /* Cannot fork to background if no command. */ | |
22616013 | 581 | if (fork_after_authentication_flag && buffer_len(&command) == 0 && |
582 | !no_shell_flag) | |
583 | fatal("Cannot fork into background without a command " | |
584 | "to execute."); | |
3c0ef626 | 585 | |
586 | /* Allocate a tty by default if no command specified. */ | |
587 | if (buffer_len(&command) == 0) | |
588 | tty_flag = 1; | |
589 | ||
41b2f314 | 590 | /* Force no tty */ |
3c0ef626 | 591 | if (no_tty_flag) |
592 | tty_flag = 0; | |
593 | /* Do not allocate a tty if stdin is not a tty. */ | |
665a873d | 594 | if ((!isatty(fileno(stdin)) || stdin_null_flag) && !force_tty_flag) { |
3c0ef626 | 595 | if (tty_flag) |
22616013 | 596 | logit("Pseudo-terminal will not be allocated because " |
597 | "stdin is not a terminal."); | |
3c0ef626 | 598 | tty_flag = 0; |
599 | } | |
600 | ||
601 | /* | |
602 | * Initialize "log" output. Since we are the client all output | |
603 | * actually goes to stderr. | |
604 | */ | |
3d738e65 | 605 | log_init(argv0, |
22616013 | 606 | options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level, |
91d9cdd3 | 607 | SYSLOG_FACILITY_USER, !use_syslog); |
3c0ef626 | 608 | |
609 | /* | |
610 | * Read per-user configuration file. Ignore the system wide config | |
611 | * file if the user specifies a config file on the command line. | |
612 | */ | |
613 | if (config != NULL) { | |
c9f39d2c | 614 | if (!read_config_file(config, host, &options, 0)) |
3c0ef626 | 615 | fatal("Can't open user config file %.100s: " |
616 | "%.100s", config, strerror(errno)); | |
799ae497 | 617 | } else { |
3d738e65 | 618 | r = snprintf(buf, sizeof buf, "%s/%s", pw->pw_dir, |
3c0ef626 | 619 | _PATH_SSH_USER_CONFFILE); |
3d738e65 | 620 | if (r > 0 && (size_t)r < sizeof(buf)) |
621 | (void)read_config_file(buf, host, &options, 1); | |
3c0ef626 | 622 | |
623 | /* Read systemwide configuration file after use config. */ | |
c9f39d2c | 624 | (void)read_config_file(_PATH_HOST_CONFIG_FILE, host, |
625 | &options, 0); | |
3c0ef626 | 626 | } |
627 | ||
628 | /* Fill configuration defaults. */ | |
629 | fill_default_options(&options); | |
630 | ||
0fff78ff | 631 | channel_set_af(options.address_family); |
632 | ||
3c0ef626 | 633 | /* reinit */ |
3d738e65 | 634 | log_init(argv0, options.log_level, SYSLOG_FACILITY_USER, !use_syslog); |
3c0ef626 | 635 | |
636 | seed_rng(); | |
637 | ||
638 | if (options.user == NULL) | |
639 | options.user = xstrdup(pw->pw_name); | |
640 | ||
22616013 | 641 | /* Get default port if port has not been set. */ |
642 | if (options.port == 0) { | |
643 | sp = getservbyname(SSH_SERVICE_NAME, "tcp"); | |
644 | options.port = sp ? ntohs(sp->s_port) : SSH_DEFAULT_PORT; | |
645 | } | |
646 | ||
647 | if (options.local_command != NULL) { | |
648 | char thishost[NI_MAXHOST]; | |
649 | ||
650 | if (gethostname(thishost, sizeof(thishost)) == -1) | |
651 | fatal("gethostname: %s", strerror(errno)); | |
652 | snprintf(buf, sizeof(buf), "%d", options.port); | |
653 | debug3("expanding LocalCommand: %s", options.local_command); | |
654 | cp = options.local_command; | |
655 | options.local_command = percent_expand(cp, "d", pw->pw_dir, | |
656 | "h", options.hostname? options.hostname : host, | |
657 | "l", thishost, "n", host, "r", options.user, "p", buf, | |
658 | "u", pw->pw_name, (char *)NULL); | |
659 | debug3("expanded LocalCommand: %s", options.local_command); | |
660 | xfree(cp); | |
661 | } | |
662 | ||
3c0ef626 | 663 | if (options.hostname != NULL) |
664 | host = options.hostname; | |
665 | ||
0fff78ff | 666 | /* force lowercase for hostkey matching */ |
667 | if (options.host_key_alias != NULL) { | |
668 | for (p = options.host_key_alias; *p; p++) | |
669 | if (isupper(*p)) | |
9108f8d9 | 670 | *p = (char)tolower(*p); |
0fff78ff | 671 | } |
672 | ||
6a9b3198 | 673 | if (options.proxy_command != NULL && |
47686178 | 674 | strcmp(options.proxy_command, "none") == 0) { |
675 | xfree(options.proxy_command); | |
6a9b3198 | 676 | options.proxy_command = NULL; |
47686178 | 677 | } |
665a873d | 678 | if (options.control_path != NULL && |
47686178 | 679 | strcmp(options.control_path, "none") == 0) { |
680 | xfree(options.control_path); | |
665a873d | 681 | options.control_path = NULL; |
47686178 | 682 | } |
6a9b3198 | 683 | |
c9f39d2c | 684 | if (options.control_path != NULL) { |
9108f8d9 | 685 | char thishost[NI_MAXHOST]; |
686 | ||
687 | if (gethostname(thishost, sizeof(thishost)) == -1) | |
688 | fatal("gethostname: %s", strerror(errno)); | |
665a873d | 689 | snprintf(buf, sizeof(buf), "%d", options.port); |
690 | cp = tilde_expand_filename(options.control_path, | |
691 | original_real_uid); | |
47686178 | 692 | xfree(options.control_path); |
665a873d | 693 | options.control_path = percent_expand(cp, "p", buf, "h", host, |
9108f8d9 | 694 | "r", options.user, "l", thishost, (char *)NULL); |
665a873d | 695 | xfree(cp); |
c9f39d2c | 696 | } |
22616013 | 697 | if (muxclient_command != 0 && options.control_path == NULL) |
665a873d | 698 | fatal("No ControlPath specified for \"-O\" command"); |
699 | if (options.control_path != NULL) | |
22616013 | 700 | muxclient(options.control_path); |
c9f39d2c | 701 | |
47686178 | 702 | timeout_ms = options.connection_timeout * 1000; |
703 | ||
3c0ef626 | 704 | /* Open a connection to the remote host. */ |
0fff78ff | 705 | if (ssh_connect(host, &hostaddr, options.port, |
47686178 | 706 | options.address_family, options.connection_attempts, &timeout_ms, |
707 | options.tcp_keep_alive, | |
f5799ae1 | 708 | #ifdef HAVE_CYGWIN |
709 | options.use_privileged_port, | |
710 | #else | |
711 | original_effective_uid == 0 && options.use_privileged_port, | |
712 | #endif | |
713 | options.proxy_command) != 0) | |
2c06c99b | 714 | exit(255); |
3c0ef626 | 715 | |
47686178 | 716 | if (timeout_ms > 0) |
717 | debug3("timeout: %d ms remain after connect", timeout_ms); | |
718 | ||
3c0ef626 | 719 | /* |
720 | * If we successfully made the connection, load the host private key | |
721 | * in case we will need it later for combined rsa-rhosts | |
722 | * authentication. This must be done before releasing extra | |
723 | * privileges, because the file is only readable by root. | |
f5799ae1 | 724 | * If we cannot access the private keys, load the public keys |
725 | * instead and try to execute the ssh-keysign helper instead. | |
3c0ef626 | 726 | */ |
727 | sensitive_data.nkeys = 0; | |
728 | sensitive_data.keys = NULL; | |
f5799ae1 | 729 | sensitive_data.external_keysign = 0; |
730 | if (options.rhosts_rsa_authentication || | |
731 | options.hostbased_authentication) { | |
3c0ef626 | 732 | sensitive_data.nkeys = 3; |
9108f8d9 | 733 | sensitive_data.keys = xcalloc(sensitive_data.nkeys, |
41b2f314 | 734 | sizeof(Key)); |
f5799ae1 | 735 | |
736 | PRIV_START; | |
3c0ef626 | 737 | sensitive_data.keys[0] = key_load_private_type(KEY_RSA1, |
9108f8d9 | 738 | _PATH_HOST_KEY_FILE, "", NULL, NULL); |
3c0ef626 | 739 | sensitive_data.keys[1] = key_load_private_type(KEY_DSA, |
9108f8d9 | 740 | _PATH_HOST_DSA_KEY_FILE, "", NULL, NULL); |
3c0ef626 | 741 | sensitive_data.keys[2] = key_load_private_type(KEY_RSA, |
9108f8d9 | 742 | _PATH_HOST_RSA_KEY_FILE, "", NULL, NULL); |
f5799ae1 | 743 | PRIV_END; |
744 | ||
41b2f314 | 745 | if (options.hostbased_authentication == 1 && |
746 | sensitive_data.keys[0] == NULL && | |
f5799ae1 | 747 | sensitive_data.keys[1] == NULL && |
748 | sensitive_data.keys[2] == NULL) { | |
749 | sensitive_data.keys[1] = key_load_public( | |
750 | _PATH_HOST_DSA_KEY_FILE, NULL); | |
751 | sensitive_data.keys[2] = key_load_public( | |
752 | _PATH_HOST_RSA_KEY_FILE, NULL); | |
753 | sensitive_data.external_keysign = 1; | |
754 | } | |
3c0ef626 | 755 | } |
756 | /* | |
757 | * Get rid of any extra privileges that we may have. We will no | |
758 | * longer need them. Also, extra privileges could make it very hard | |
759 | * to read identity files and other non-world-readable files from the | |
760 | * user's home directory if it happens to be on a NFS volume where | |
761 | * root is mapped to nobody. | |
762 | */ | |
c9f39d2c | 763 | if (original_effective_uid == 0) { |
764 | PRIV_START; | |
765 | permanently_set_uid(pw); | |
766 | } | |
3c0ef626 | 767 | |
768 | /* | |
769 | * Now that we are back to our own permissions, create ~/.ssh | |
2c06c99b | 770 | * directory if it doesn't already exist. |
3c0ef626 | 771 | */ |
3d738e65 | 772 | r = snprintf(buf, sizeof buf, "%s%s%s", pw->pw_dir, |
22616013 | 773 | strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR); |
3d738e65 | 774 | if (r > 0 && (size_t)r < sizeof(buf) && stat(buf, &st) < 0) |
3c0ef626 | 775 | if (mkdir(buf, 0700) < 0) |
776 | error("Could not create directory '%.200s'.", buf); | |
777 | ||
3c0ef626 | 778 | /* load options.identity_files */ |
779 | load_public_identity_files(); | |
780 | ||
781 | /* Expand ~ in known host file names. */ | |
782 | /* XXX mem-leaks: */ | |
783 | options.system_hostfile = | |
784 | tilde_expand_filename(options.system_hostfile, original_real_uid); | |
785 | options.user_hostfile = | |
786 | tilde_expand_filename(options.user_hostfile, original_real_uid); | |
787 | options.system_hostfile2 = | |
788 | tilde_expand_filename(options.system_hostfile2, original_real_uid); | |
789 | options.user_hostfile2 = | |
790 | tilde_expand_filename(options.user_hostfile2, original_real_uid); | |
791 | ||
792 | signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */ | |
793 | ||
22616013 | 794 | /* Log into the remote system. Never returns if the login fails. */ |
47686178 | 795 | ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr, |
796 | pw, timeout_ms); | |
3c0ef626 | 797 | |
798 | /* We no longer need the private host keys. Clear them now. */ | |
799 | if (sensitive_data.nkeys != 0) { | |
800 | for (i = 0; i < sensitive_data.nkeys; i++) { | |
801 | if (sensitive_data.keys[i] != NULL) { | |
802 | /* Destroys contents safely */ | |
803 | debug3("clear hostkey %d", i); | |
804 | key_free(sensitive_data.keys[i]); | |
805 | sensitive_data.keys[i] = NULL; | |
806 | } | |
807 | } | |
808 | xfree(sensitive_data.keys); | |
809 | } | |
810 | for (i = 0; i < options.num_identity_files; i++) { | |
811 | if (options.identity_files[i]) { | |
812 | xfree(options.identity_files[i]); | |
813 | options.identity_files[i] = NULL; | |
814 | } | |
815 | if (options.identity_keys[i]) { | |
816 | key_free(options.identity_keys[i]); | |
817 | options.identity_keys[i] = NULL; | |
818 | } | |
819 | } | |
820 | ||
821 | exit_status = compat20 ? ssh_session2() : ssh_session(); | |
822 | packet_close(); | |
41b2f314 | 823 | |
22616013 | 824 | if (options.control_path != NULL && muxserver_sock != -1) |
c9f39d2c | 825 | unlink(options.control_path); |
826 | ||
41b2f314 | 827 | /* |
cdd66111 | 828 | * Send SIGHUP to proxy command if used. We don't wait() in |
41b2f314 | 829 | * case it hangs and instead rely on init to reap the child |
830 | */ | |
831 | if (proxy_command_pid > 1) | |
832 | kill(proxy_command_pid, SIGHUP); | |
833 | ||
3c0ef626 | 834 | return exit_status; |
835 | } | |
836 | ||
22616013 | 837 | /* Callback for remote forward global requests */ |
838 | static void | |
839 | ssh_confirm_remote_forward(int type, u_int32_t seq, void *ctxt) | |
840 | { | |
841 | Forward *rfwd = (Forward *)ctxt; | |
842 | ||
91d9cdd3 | 843 | /* XXX verbose() on failure? */ |
22616013 | 844 | debug("remote forward %s for: listen %d, connect %s:%d", |
845 | type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure", | |
846 | rfwd->listen_port, rfwd->connect_host, rfwd->connect_port); | |
91d9cdd3 | 847 | if (type == SSH2_MSG_REQUEST_SUCCESS && rfwd->listen_port == 0) { |
848 | logit("Allocated port %u for remote forward to %s:%d", | |
849 | packet_get_int(), | |
850 | rfwd->connect_host, rfwd->connect_port); | |
851 | } | |
852 | ||
22616013 | 853 | if (type == SSH2_MSG_REQUEST_FAILURE) { |
854 | if (options.exit_on_forward_failure) | |
855 | fatal("Error: remote port forwarding failed for " | |
856 | "listen port %d", rfwd->listen_port); | |
857 | else | |
858 | logit("Warning: remote port forwarding failed for " | |
859 | "listen port %d", rfwd->listen_port); | |
860 | } | |
861 | if (++remote_forward_confirms_received == options.num_remote_forwards) { | |
862 | debug("All remote forwarding requests processed"); | |
863 | if (fork_after_authentication_flag) { | |
864 | fork_after_authentication_flag = 0; | |
865 | if (daemon(1, 1) < 0) | |
866 | fatal("daemon() failed: %.200s", | |
867 | strerror(errno)); | |
868 | } | |
869 | } | |
870 | } | |
871 | ||
3c0ef626 | 872 | static void |
873 | ssh_init_forwarding(void) | |
874 | { | |
875 | int success = 0; | |
876 | int i; | |
877 | ||
878 | /* Initiate local TCP/IP port forwardings. */ | |
879 | for (i = 0; i < options.num_local_forwards; i++) { | |
996d5e62 | 880 | debug("Local connections to %.200s:%d forwarded to remote " |
881 | "address %.200s:%d", | |
dec6d9fe | 882 | (options.local_forwards[i].listen_host == NULL) ? |
883 | (options.gateway_ports ? "*" : "LOCALHOST") : | |
996d5e62 | 884 | options.local_forwards[i].listen_host, |
885 | options.local_forwards[i].listen_port, | |
886 | options.local_forwards[i].connect_host, | |
887 | options.local_forwards[i].connect_port); | |
e9a17296 | 888 | success += channel_setup_local_fwd_listener( |
996d5e62 | 889 | options.local_forwards[i].listen_host, |
890 | options.local_forwards[i].listen_port, | |
891 | options.local_forwards[i].connect_host, | |
892 | options.local_forwards[i].connect_port, | |
3c0ef626 | 893 | options.gateway_ports); |
894 | } | |
9108f8d9 | 895 | if (i > 0 && success != i && options.exit_on_forward_failure) |
896 | fatal("Could not request local forwarding."); | |
3c0ef626 | 897 | if (i > 0 && success == 0) |
898 | error("Could not request local forwarding."); | |
899 | ||
900 | /* Initiate remote TCP/IP port forwardings. */ | |
901 | for (i = 0; i < options.num_remote_forwards; i++) { | |
996d5e62 | 902 | debug("Remote connections from %.200s:%d forwarded to " |
903 | "local address %.200s:%d", | |
665a873d | 904 | (options.remote_forwards[i].listen_host == NULL) ? |
2c06c99b | 905 | "LOCALHOST" : options.remote_forwards[i].listen_host, |
996d5e62 | 906 | options.remote_forwards[i].listen_port, |
907 | options.remote_forwards[i].connect_host, | |
908 | options.remote_forwards[i].connect_port); | |
9108f8d9 | 909 | if (channel_request_remote_forwarding( |
996d5e62 | 910 | options.remote_forwards[i].listen_host, |
911 | options.remote_forwards[i].listen_port, | |
912 | options.remote_forwards[i].connect_host, | |
9108f8d9 | 913 | options.remote_forwards[i].connect_port) < 0) { |
914 | if (options.exit_on_forward_failure) | |
915 | fatal("Could not request remote forwarding."); | |
916 | else | |
917 | logit("Warning: Could not request remote " | |
918 | "forwarding."); | |
919 | } | |
22616013 | 920 | client_register_global_confirm(ssh_confirm_remote_forward, |
921 | &options.remote_forwards[i]); | |
3c0ef626 | 922 | } |
d4487008 | 923 | |
924 | /* Initiate tunnel forwarding. */ | |
925 | if (options.tun_open != SSH_TUNMODE_NO) { | |
926 | if (client_request_tun_fwd(options.tun_open, | |
927 | options.tun_local, options.tun_remote) == -1) { | |
928 | if (options.exit_on_forward_failure) | |
929 | fatal("Could not request tunnel forwarding."); | |
930 | else | |
931 | error("Could not request tunnel forwarding."); | |
932 | } | |
933 | } | |
3c0ef626 | 934 | } |
935 | ||
936 | static void | |
937 | check_agent_present(void) | |
938 | { | |
939 | if (options.forward_agent) { | |
2c06c99b | 940 | /* Clear agent forwarding if we don't have an agent. */ |
41b2f314 | 941 | if (!ssh_agent_present()) |
3c0ef626 | 942 | options.forward_agent = 0; |
3c0ef626 | 943 | } |
944 | } | |
945 | ||
946 | static int | |
947 | ssh_session(void) | |
948 | { | |
949 | int type; | |
3c0ef626 | 950 | int interactive = 0; |
951 | int have_tty = 0; | |
952 | struct winsize ws; | |
953 | char *cp; | |
665a873d | 954 | const char *display; |
3c0ef626 | 955 | |
956 | /* Enable compression if requested. */ | |
957 | if (options.compression) { | |
22616013 | 958 | debug("Requesting compression at level %d.", |
959 | options.compression_level); | |
3c0ef626 | 960 | |
22616013 | 961 | if (options.compression_level < 1 || |
962 | options.compression_level > 9) | |
963 | fatal("Compression level must be from 1 (fast) to " | |
964 | "9 (slow, best)."); | |
3c0ef626 | 965 | |
966 | /* Send the request. */ | |
967 | packet_start(SSH_CMSG_REQUEST_COMPRESSION); | |
968 | packet_put_int(options.compression_level); | |
969 | packet_send(); | |
970 | packet_write_wait(); | |
e9a17296 | 971 | type = packet_read(); |
3c0ef626 | 972 | if (type == SSH_SMSG_SUCCESS) |
973 | packet_start_compression(options.compression_level); | |
974 | else if (type == SSH_SMSG_FAILURE) | |
0fff78ff | 975 | logit("Warning: Remote host refused compression."); |
3c0ef626 | 976 | else |
22616013 | 977 | packet_disconnect("Protocol error waiting for " |
978 | "compression response."); | |
3c0ef626 | 979 | } |
980 | /* Allocate a pseudo tty if appropriate. */ | |
981 | if (tty_flag) { | |
982 | debug("Requesting pty."); | |
983 | ||
984 | /* Start the packet. */ | |
985 | packet_start(SSH_CMSG_REQUEST_PTY); | |
986 | ||
987 | /* Store TERM in the packet. There is no limit on the | |
988 | length of the string. */ | |
989 | cp = getenv("TERM"); | |
990 | if (!cp) | |
991 | cp = ""; | |
992 | packet_put_cstring(cp); | |
993 | ||
994 | /* Store window size in the packet. */ | |
995 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) | |
996 | memset(&ws, 0, sizeof(ws)); | |
9108f8d9 | 997 | packet_put_int((u_int)ws.ws_row); |
998 | packet_put_int((u_int)ws.ws_col); | |
999 | packet_put_int((u_int)ws.ws_xpixel); | |
1000 | packet_put_int((u_int)ws.ws_ypixel); | |
3c0ef626 | 1001 | |
1002 | /* Store tty modes in the packet. */ | |
1003 | tty_make_modes(fileno(stdin), NULL); | |
1004 | ||
1005 | /* Send the packet, and wait for it to leave. */ | |
1006 | packet_send(); | |
1007 | packet_write_wait(); | |
1008 | ||
1009 | /* Read response from the server. */ | |
e9a17296 | 1010 | type = packet_read(); |
3c0ef626 | 1011 | if (type == SSH_SMSG_SUCCESS) { |
1012 | interactive = 1; | |
1013 | have_tty = 1; | |
1014 | } else if (type == SSH_SMSG_FAILURE) | |
22616013 | 1015 | logit("Warning: Remote host failed or refused to " |
1016 | "allocate a pseudo tty."); | |
3c0ef626 | 1017 | else |
22616013 | 1018 | packet_disconnect("Protocol error waiting for pty " |
1019 | "request response."); | |
3c0ef626 | 1020 | } |
1021 | /* Request X11 forwarding if enabled and DISPLAY is set. */ | |
665a873d | 1022 | display = getenv("DISPLAY"); |
1023 | if (options.forward_x11 && display != NULL) { | |
e9a17296 | 1024 | char *proto, *data; |
3c0ef626 | 1025 | /* Get reasonable local authentication information. */ |
665a873d | 1026 | client_x11_get_proto(display, options.xauth_location, |
1027 | options.forward_x11_trusted, &proto, &data); | |
3c0ef626 | 1028 | /* Request forwarding with authentication spoofing. */ |
22616013 | 1029 | debug("Requesting X11 forwarding with authentication " |
1030 | "spoofing."); | |
665a873d | 1031 | x11_request_forwarding_with_spoofing(0, display, proto, data); |
3c0ef626 | 1032 | |
1033 | /* Read response from the server. */ | |
e9a17296 | 1034 | type = packet_read(); |
3c0ef626 | 1035 | if (type == SSH_SMSG_SUCCESS) { |
1036 | interactive = 1; | |
1037 | } else if (type == SSH_SMSG_FAILURE) { | |
0fff78ff | 1038 | logit("Warning: Remote host denied X11 forwarding."); |
3c0ef626 | 1039 | } else { |
22616013 | 1040 | packet_disconnect("Protocol error waiting for X11 " |
1041 | "forwarding"); | |
3c0ef626 | 1042 | } |
1043 | } | |
1044 | /* Tell the packet module whether this is an interactive session. */ | |
1045 | packet_set_interactive(interactive); | |
1046 | ||
1047 | /* Request authentication agent forwarding if appropriate. */ | |
1048 | check_agent_present(); | |
1049 | ||
1050 | if (options.forward_agent) { | |
1051 | debug("Requesting authentication agent forwarding."); | |
1052 | auth_request_forwarding(); | |
1053 | ||
1054 | /* Read response from the server. */ | |
e9a17296 | 1055 | type = packet_read(); |
1056 | packet_check_eom(); | |
3c0ef626 | 1057 | if (type != SSH_SMSG_SUCCESS) |
0fff78ff | 1058 | logit("Warning: Remote host denied authentication agent forwarding."); |
3c0ef626 | 1059 | } |
1060 | ||
1061 | /* Initiate port forwardings. */ | |
1062 | ssh_init_forwarding(); | |
1063 | ||
47686178 | 1064 | /* Execute a local command */ |
1065 | if (options.local_command != NULL && | |
1066 | options.permit_local_command) | |
1067 | ssh_local_cmd(options.local_command); | |
1068 | ||
22616013 | 1069 | /* |
1070 | * If requested and we are not interested in replies to remote | |
1071 | * forwarding requests, then let ssh continue in the background. | |
1072 | */ | |
1073 | if (fork_after_authentication_flag && | |
1074 | (!options.exit_on_forward_failure || | |
1075 | options.num_remote_forwards == 0)) { | |
1076 | fork_after_authentication_flag = 0; | |
3c0ef626 | 1077 | if (daemon(1, 1) < 0) |
1078 | fatal("daemon() failed: %.200s", strerror(errno)); | |
22616013 | 1079 | } |
3c0ef626 | 1080 | |
1081 | /* | |
1082 | * If a command was specified on the command line, execute the | |
1083 | * command now. Otherwise request the server to start a shell. | |
1084 | */ | |
1085 | if (buffer_len(&command) > 0) { | |
1086 | int len = buffer_len(&command); | |
1087 | if (len > 900) | |
1088 | len = 900; | |
22616013 | 1089 | debug("Sending command: %.*s", len, |
1090 | (u_char *)buffer_ptr(&command)); | |
3c0ef626 | 1091 | packet_start(SSH_CMSG_EXEC_CMD); |
1092 | packet_put_string(buffer_ptr(&command), buffer_len(&command)); | |
1093 | packet_send(); | |
1094 | packet_write_wait(); | |
1095 | } else { | |
1096 | debug("Requesting shell."); | |
1097 | packet_start(SSH_CMSG_EXEC_SHELL); | |
1098 | packet_send(); | |
1099 | packet_write_wait(); | |
1100 | } | |
1101 | ||
1102 | /* Enter the interactive session. */ | |
1103 | return client_loop(have_tty, tty_flag ? | |
1104 | options.escape_char : SSH_ESCAPECHAR_NONE, 0); | |
1105 | } | |
1106 | ||
c9f39d2c | 1107 | /* request pty/x11/agent/tcpfwd/shell for channel */ |
1108 | static void | |
1109 | ssh_session2_setup(int id, void *arg) | |
1110 | { | |
1111 | extern char **environ; | |
665a873d | 1112 | const char *display; |
c9f39d2c | 1113 | int interactive = tty_flag; |
665a873d | 1114 | |
1115 | display = getenv("DISPLAY"); | |
1116 | if (options.forward_x11 && display != NULL) { | |
e9a17296 | 1117 | char *proto, *data; |
3c0ef626 | 1118 | /* Get reasonable local authentication information. */ |
665a873d | 1119 | client_x11_get_proto(display, options.xauth_location, |
1120 | options.forward_x11_trusted, &proto, &data); | |
3c0ef626 | 1121 | /* Request forwarding with authentication spoofing. */ |
22616013 | 1122 | debug("Requesting X11 forwarding with authentication " |
1123 | "spoofing."); | |
665a873d | 1124 | x11_request_forwarding_with_spoofing(id, display, proto, data); |
3c0ef626 | 1125 | interactive = 1; |
1126 | /* XXX wait for reply */ | |
1127 | } | |
1128 | ||
1129 | check_agent_present(); | |
1130 | if (options.forward_agent) { | |
1131 | debug("Requesting authentication agent forwarding."); | |
1132 | channel_request_start(id, "auth-agent-req@openssh.com", 0); | |
1133 | packet_send(); | |
1134 | } | |
1135 | ||
c9f39d2c | 1136 | client_session2_setup(id, tty_flag, subsystem_flag, getenv("TERM"), |
22616013 | 1137 | NULL, fileno(stdin), &command, environ); |
3c0ef626 | 1138 | |
3c0ef626 | 1139 | packet_set_interactive(interactive); |
1140 | } | |
1141 | ||
1142 | /* open new channel for a session */ | |
1143 | static int | |
1144 | ssh_session2_open(void) | |
1145 | { | |
1146 | Channel *c; | |
1147 | int window, packetmax, in, out, err; | |
1148 | ||
1149 | if (stdin_null_flag) { | |
1150 | in = open(_PATH_DEVNULL, O_RDONLY); | |
1151 | } else { | |
1152 | in = dup(STDIN_FILENO); | |
1153 | } | |
1154 | out = dup(STDOUT_FILENO); | |
1155 | err = dup(STDERR_FILENO); | |
1156 | ||
1157 | if (in < 0 || out < 0 || err < 0) | |
1158 | fatal("dup() in/out/err failed"); | |
1159 | ||
1160 | /* enable nonblocking unless tty */ | |
1161 | if (!isatty(in)) | |
1162 | set_nonblock(in); | |
1163 | if (!isatty(out)) | |
1164 | set_nonblock(out); | |
1165 | if (!isatty(err)) | |
1166 | set_nonblock(err); | |
1167 | ||
1168 | window = CHAN_SES_WINDOW_DEFAULT; | |
1169 | packetmax = CHAN_SES_PACKET_DEFAULT; | |
e9a17296 | 1170 | if (tty_flag) { |
1171 | window >>= 1; | |
1172 | packetmax >>= 1; | |
3c0ef626 | 1173 | } |
1174 | c = channel_new( | |
1175 | "session", SSH_CHANNEL_OPENING, in, out, err, | |
1176 | window, packetmax, CHAN_EXTENDED_WRITE, | |
0fff78ff | 1177 | "client-session", /*nonblock*/0); |
3c0ef626 | 1178 | |
1179 | debug3("ssh_session2_open: channel_new: %d", c->self); | |
1180 | ||
1181 | channel_send_open(c->self); | |
1182 | if (!no_shell_flag) | |
22616013 | 1183 | channel_register_open_confirm(c->self, |
1184 | ssh_session2_setup, NULL); | |
3c0ef626 | 1185 | |
1186 | return c->self; | |
1187 | } | |
1188 | ||
1189 | static int | |
1190 | ssh_session2(void) | |
1191 | { | |
1192 | int id = -1; | |
1193 | ||
1194 | /* XXX should be pre-session */ | |
1195 | ssh_init_forwarding(); | |
1196 | ||
1197 | if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN)) | |
1198 | id = ssh_session2_open(); | |
1199 | ||
22616013 | 1200 | /* If we don't expect to open a new session, then disallow it */ |
91d9cdd3 | 1201 | if (options.control_master == SSHCTL_MASTER_NO && |
1202 | (datafellows & SSH_NEW_OPENSSH)) { | |
22616013 | 1203 | debug("Requesting no-more-sessions@openssh.com"); |
1204 | packet_start(SSH2_MSG_GLOBAL_REQUEST); | |
1205 | packet_put_cstring("no-more-sessions@openssh.com"); | |
1206 | packet_put_char(0); | |
1207 | packet_send(); | |
1208 | } | |
1209 | ||
2c06c99b | 1210 | /* Execute a local command */ |
1211 | if (options.local_command != NULL && | |
1212 | options.permit_local_command) | |
1213 | ssh_local_cmd(options.local_command); | |
1214 | ||
d4487008 | 1215 | /* Start listening for multiplex clients */ |
22616013 | 1216 | muxserver_listen(); |
d4487008 | 1217 | |
3c0ef626 | 1218 | /* If requested, let ssh continue in the background. */ |
22616013 | 1219 | if (fork_after_authentication_flag) { |
1220 | fork_after_authentication_flag = 0; | |
3c0ef626 | 1221 | if (daemon(1, 1) < 0) |
1222 | fatal("daemon() failed: %.200s", strerror(errno)); | |
22616013 | 1223 | } |
3c0ef626 | 1224 | |
1225 | return client_loop(tty_flag, tty_flag ? | |
1226 | options.escape_char : SSH_ESCAPECHAR_NONE, id); | |
1227 | } | |
1228 | ||
1229 | static void | |
1230 | load_public_identity_files(void) | |
1231 | { | |
9108f8d9 | 1232 | char *filename, *cp, thishost[NI_MAXHOST]; |
47686178 | 1233 | char *pwdir = NULL, *pwname = NULL; |
3c0ef626 | 1234 | int i = 0; |
700318f3 | 1235 | Key *public; |
9108f8d9 | 1236 | struct passwd *pw; |
3c0ef626 | 1237 | #ifdef SMARTCARD |
700318f3 | 1238 | Key **keys; |
1239 | ||
3c0ef626 | 1240 | if (options.smartcard_device != NULL && |
700318f3 | 1241 | options.num_identity_files < SSH_MAX_IDENTITY_FILES && |
9108f8d9 | 1242 | (keys = sc_get_keys(options.smartcard_device, NULL)) != NULL) { |
700318f3 | 1243 | int count = 0; |
1244 | for (i = 0; keys[i] != NULL; i++) { | |
1245 | count++; | |
22616013 | 1246 | memmove(&options.identity_files[1], |
1247 | &options.identity_files[0], | |
700318f3 | 1248 | sizeof(char *) * (SSH_MAX_IDENTITY_FILES - 1)); |
22616013 | 1249 | memmove(&options.identity_keys[1], |
1250 | &options.identity_keys[0], | |
700318f3 | 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 | } |