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e6780883 | 1 | /* $OpenBSD: ssh.c,v 1.331 2010/01/11 01:39:46 dtucker Exp $ */ |
8efc0c15 | 2 | /* |
5260325f | 3 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
4 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
5 | * All rights reserved | |
5260325f | 6 | * Ssh client program. This program can be used to log into a remote machine. |
7 | * The software supports strong authentication, encryption, and forwarding | |
8 | * of X11, TCP/IP, and authentication connections. | |
9 | * | |
bcbf86ec | 10 | * As far as I am concerned, the code I have written for this software |
11 | * can be used freely for any purpose. Any derived versions of this | |
12 | * software must be clearly marked as such, and if the derived work is | |
13 | * incompatible with the protocol description in the RFC file, it must be | |
14 | * called by a name other than "ssh" or "Secure Shell". | |
15 | * | |
16 | * Copyright (c) 1999 Niels Provos. All rights reserved. | |
d73a67d7 | 17 | * Copyright (c) 2000, 2001, 2002, 2003 Markus Friedl. All rights reserved. |
bcbf86ec | 18 | * |
19 | * Modified to work with SSL by Niels Provos <provos@citi.umich.edu> | |
20 | * in Canada (German citizen). | |
21 | * | |
22 | * Redistribution and use in source and binary forms, with or without | |
23 | * modification, are permitted provided that the following conditions | |
24 | * are met: | |
25 | * 1. Redistributions of source code must retain the above copyright | |
26 | * notice, this list of conditions and the following disclaimer. | |
27 | * 2. Redistributions in binary form must reproduce the above copyright | |
28 | * notice, this list of conditions and the following disclaimer in the | |
29 | * documentation and/or other materials provided with the distribution. | |
30 | * | |
31 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
32 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
33 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
34 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
35 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
36 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
37 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
38 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
39 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
40 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
5260325f | 41 | */ |
8efc0c15 | 42 | |
43 | #include "includes.h" | |
876faccd | 44 | |
4095f623 | 45 | #include <sys/types.h> |
46 | #ifdef HAVE_SYS_STAT_H | |
47 | # include <sys/stat.h> | |
48 | #endif | |
876faccd | 49 | #include <sys/resource.h> |
bd7c69ea | 50 | #include <sys/ioctl.h> |
0f63ab10 | 51 | #include <sys/param.h> |
5b04a8bf | 52 | #include <sys/socket.h> |
a75f5360 | 53 | |
b6438382 | 54 | #include <ctype.h> |
dd984467 | 55 | #include <errno.h> |
d3221cca | 56 | #include <fcntl.h> |
28cb0a43 | 57 | #include <netdb.h> |
b5b88c19 | 58 | #ifdef HAVE_PATHS_H |
a75f5360 | 59 | #include <paths.h> |
b5b88c19 | 60 | #endif |
b1842393 | 61 | #include <pwd.h> |
ada68823 | 62 | #include <signal.h> |
24436b92 | 63 | #include <stdarg.h> |
bcaab305 | 64 | #include <stddef.h> |
cf851879 | 65 | #include <stdio.h> |
ffa517a8 | 66 | #include <stdlib.h> |
00146caa | 67 | #include <string.h> |
5188ba17 | 68 | #include <unistd.h> |
8efc0c15 | 69 | |
5e837c7b | 70 | #include <netinet/in.h> |
71 | #include <arpa/inet.h> | |
72 | ||
a306f2dd | 73 | #include <openssl/evp.h> |
fa08c86b | 74 | #include <openssl/err.h> |
f5f25d17 | 75 | #include "openbsd-compat/openssl-compat.h" |
3593bdc0 | 76 | #include "openbsd-compat/sys-queue.h" |
a306f2dd | 77 | |
31652869 | 78 | #include "xmalloc.h" |
8efc0c15 | 79 | #include "ssh.h" |
42f11eb2 | 80 | #include "ssh1.h" |
81 | #include "ssh2.h" | |
82 | #include "compat.h" | |
83 | #include "cipher.h" | |
8efc0c15 | 84 | #include "packet.h" |
85 | #include "buffer.h" | |
a5efa1bb | 86 | #include "channels.h" |
a306f2dd | 87 | #include "key.h" |
4c8722d9 | 88 | #include "authfd.h" |
a306f2dd | 89 | #include "authfile.h" |
42f11eb2 | 90 | #include "pathnames.h" |
5e96b616 | 91 | #include "dispatch.h" |
b5c334cc | 92 | #include "clientloop.h" |
42f11eb2 | 93 | #include "log.h" |
94 | #include "readconf.h" | |
95 | #include "sshconnect.h" | |
42f11eb2 | 96 | #include "misc.h" |
b2552997 | 97 | #include "kex.h" |
98 | #include "mac.h" | |
07d80252 | 99 | #include "sshpty.h" |
61a2c1da | 100 | #include "match.h" |
5e96b616 | 101 | #include "msg.h" |
6213295d | 102 | #include "uidswap.h" |
1cb94277 | 103 | #include "roaming.h" |
28015df4 | 104 | #include "version.h" |
8efc0c15 | 105 | |
383546c4 | 106 | #ifdef SMARTCARD |
383546c4 | 107 | #include "scard.h" |
dd2495cb | 108 | #endif |
383546c4 | 109 | |
f601d847 | 110 | extern char *__progname; |
f601d847 | 111 | |
e8097dc9 | 112 | /* Flag indicating whether debug mode is on. May be set on the command line. */ |
8efc0c15 | 113 | int debug_flag = 0; |
114 | ||
a8be9f80 | 115 | /* Flag indicating whether a tty should be allocated */ |
8efc0c15 | 116 | int tty_flag = 0; |
8abcdba4 | 117 | int no_tty_flag = 0; |
118 | int force_tty_flag = 0; | |
8efc0c15 | 119 | |
8ce64345 | 120 | /* don't exec a shell */ |
121 | int no_shell_flag = 0; | |
8ce64345 | 122 | |
aa3378df | 123 | /* |
124 | * Flag indicating that nothing should be read from stdin. This can be set | |
125 | * on the command line. | |
126 | */ | |
8efc0c15 | 127 | int stdin_null_flag = 0; |
128 | ||
aa3378df | 129 | /* |
130 | * Flag indicating that ssh should fork after authentication. This is useful | |
c242fc96 | 131 | * so that the passphrase can be entered manually, and then ssh goes to the |
aa3378df | 132 | * background. |
133 | */ | |
8efc0c15 | 134 | int fork_after_authentication_flag = 0; |
135 | ||
e6780883 | 136 | /* forward stdio to remote host and port */ |
137 | char *stdio_forward_host = NULL; | |
138 | int stdio_forward_port = 0; | |
139 | ||
aa3378df | 140 | /* |
141 | * General data structure for command line options and options configurable | |
142 | * in configuration files. See readconf.h. | |
143 | */ | |
8efc0c15 | 144 | Options options; |
145 | ||
e591b98a | 146 | /* optional user configfile */ |
147 | char *config = NULL; | |
148 | ||
aa3378df | 149 | /* |
150 | * Name of the host we are connecting to. This is the name given on the | |
151 | * command line, or the HostName specified for the user-supplied name in a | |
152 | * configuration file. | |
153 | */ | |
8efc0c15 | 154 | char *host; |
155 | ||
156 | /* socket address the host resolves to */ | |
48e671d5 | 157 | struct sockaddr_storage hostaddr; |
8efc0c15 | 158 | |
8002af61 | 159 | /* Private host keys. */ |
39c00dc2 | 160 | Sensitive sensitive_data; |
8efc0c15 | 161 | |
162 | /* Original real UID. */ | |
163 | uid_t original_real_uid; | |
3fb156df | 164 | uid_t original_effective_uid; |
8efc0c15 | 165 | |
8ce64345 | 166 | /* command to be executed */ |
167 | Buffer command; | |
168 | ||
ae810de7 | 169 | /* Should we execute a command or invoke a subsystem? */ |
170 | int subsystem_flag = 0; | |
171 | ||
e0ae8728 | 172 | /* # of replies received for global requests */ |
72becb62 | 173 | static int remote_forward_confirms_received = 0; |
e0ae8728 | 174 | |
6939bbd4 | 175 | /* pid of proxycommand child process */ |
176 | pid_t proxy_command_pid = 0; | |
177 | ||
3bcced4c | 178 | /* mux.c */ |
179 | extern int muxserver_sock; | |
180 | extern u_int muxclient_command; | |
5e96b616 | 181 | |
8efc0c15 | 182 | /* Prints a help message to the user. This function never returns. */ |
183 | ||
396c147e | 184 | static void |
5ca51e19 | 185 | usage(void) |
8efc0c15 | 186 | { |
182ccbba | 187 | fprintf(stderr, |
f3a4d0d0 | 188 | "usage: ssh [-1246AaCfgKkMNnqsTtVvXxYy] [-b bind_address] [-c cipher_spec]\n" |
80e29ee6 | 189 | " [-D [bind_address:]port] [-e escape_char] [-F configfile]\n" |
8cf98c65 | 190 | " [-i identity_file] [-L [bind_address:]port:host:hostport]\n" |
3867aa0a | 191 | " [-l login_name] [-m mac_spec] [-O ctl_cmd] [-o option] [-p port]\n" |
8cf98c65 | 192 | " [-R [bind_address:]port:host:hostport] [-S ctl_path]\n" |
e6780883 | 193 | " [-W host:port] [-w local_tun[:remote_tun]]\n" |
194 | " [user@]hostname [command]\n" | |
182ccbba | 195 | ); |
3aa43b24 | 196 | exit(255); |
8efc0c15 | 197 | } |
198 | ||
396c147e | 199 | static int ssh_session(void); |
200 | static int ssh_session2(void); | |
201 | static void load_public_identity_files(void); | |
3bcced4c | 202 | |
203 | /* from muxclient.c */ | |
204 | void muxclient(const char *); | |
205 | void muxserver_listen(void); | |
8ce64345 | 206 | |
5260325f | 207 | /* |
208 | * Main program for the ssh client. | |
209 | */ | |
8efc0c15 | 210 | int |
211 | main(int ac, char **av) | |
212 | { | |
0f63ab10 | 213 | int i, r, opt, exit_status, use_syslog; |
214 | char *p, *cp, *line, *argv0, buf[MAXPATHLEN]; | |
5260325f | 215 | struct stat st; |
3b1a83df | 216 | struct passwd *pw; |
71300a43 | 217 | int dummy, timeout_ms; |
57dade33 | 218 | extern int optind, optreset; |
1812a662 | 219 | extern char *optarg; |
c1cbe68a | 220 | struct servent *sp; |
3867aa0a | 221 | Forward fwd; |
5260325f | 222 | |
fd6168c1 | 223 | /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ |
224 | sanitise_stdfd(); | |
225 | ||
fda04d7d | 226 | __progname = ssh_get_progname(av[0]); |
264dce47 | 227 | init_rng(); |
228 | ||
aa3378df | 229 | /* |
230 | * Save the original real uid. It will be needed later (uid-swapping | |
231 | * may clobber the real uid). | |
232 | */ | |
5260325f | 233 | original_real_uid = getuid(); |
234 | original_effective_uid = geteuid(); | |
aff51935 | 235 | |
9f324470 | 236 | /* |
237 | * Use uid-swapping to give up root privileges for the duration of | |
238 | * option processing. We will re-instantiate the rights when we are | |
239 | * ready to create the privileged port, and will permanently drop | |
240 | * them when the port has been created (actually, when the connection | |
241 | * has been made, as we may need to create the port several times). | |
242 | */ | |
243 | PRIV_END; | |
5260325f | 244 | |
7322ef0e | 245 | #ifdef HAVE_SETRLIMIT |
5260325f | 246 | /* If we are installed setuid root be careful to not drop core. */ |
247 | if (original_real_uid != original_effective_uid) { | |
248 | struct rlimit rlim; | |
249 | rlim.rlim_cur = rlim.rlim_max = 0; | |
250 | if (setrlimit(RLIMIT_CORE, &rlim) < 0) | |
251 | fatal("setrlimit failed: %.100s", strerror(errno)); | |
8efc0c15 | 252 | } |
3c62e7eb | 253 | #endif |
63bd8c36 | 254 | /* Get user data. */ |
255 | pw = getpwuid(original_real_uid); | |
256 | if (!pw) { | |
bbe88b6d | 257 | logit("You don't exist, go away!"); |
3aa43b24 | 258 | exit(255); |
63bd8c36 | 259 | } |
260 | /* Take a copy of the returned structure. */ | |
261 | pw = pwcopy(pw); | |
262 | ||
aa3378df | 263 | /* |
264 | * Set our umask to something reasonable, as some files are created | |
265 | * with the default umask. This will make them world-readable but | |
266 | * writable only by the owner, which is ok for all files for which we | |
267 | * don't set the modes explicitly. | |
268 | */ | |
5260325f | 269 | umask(022); |
270 | ||
e8097dc9 | 271 | /* |
272 | * Initialize option structure to indicate that no values have been | |
273 | * set. | |
274 | */ | |
5260325f | 275 | initialize_options(&options); |
276 | ||
277 | /* Parse command-line arguments. */ | |
278 | host = NULL; | |
bf793210 | 279 | use_syslog = 0; |
f0956980 | 280 | argv0 = av[0]; |
5260325f | 281 | |
16a5525d | 282 | again: |
e8097dc9 | 283 | while ((opt = getopt(ac, av, "1246ab:c:e:fgi:kl:m:no:p:qstvx" |
e6780883 | 284 | "ACD:F:I:KL:MNO:PR:S:TVw:W:XYy")) != -1) { |
5260325f | 285 | switch (opt) { |
1f3bf5aa | 286 | case '1': |
287 | options.protocol = SSH_PROTO_1; | |
288 | break; | |
6ae2364d | 289 | case '2': |
290 | options.protocol = SSH_PROTO_2; | |
291 | break; | |
48e671d5 | 292 | case '4': |
1572b90f | 293 | options.address_family = AF_INET; |
48e671d5 | 294 | break; |
48e671d5 | 295 | case '6': |
1572b90f | 296 | options.address_family = AF_INET6; |
48e671d5 | 297 | break; |
5260325f | 298 | case 'n': |
299 | stdin_null_flag = 1; | |
300 | break; | |
5260325f | 301 | case 'f': |
302 | fork_after_authentication_flag = 1; | |
303 | stdin_null_flag = 1; | |
304 | break; | |
5260325f | 305 | case 'x': |
306 | options.forward_x11 = 0; | |
307 | break; | |
5260325f | 308 | case 'X': |
309 | options.forward_x11 = 1; | |
310 | break; | |
bf793210 | 311 | case 'y': |
312 | use_syslog = 1; | |
313 | break; | |
d73a67d7 | 314 | case 'Y': |
315 | options.forward_x11 = 1; | |
316 | options.forward_x11_trusted = 1; | |
317 | break; | |
5260325f | 318 | case 'g': |
319 | options.gateway_ports = 1; | |
320 | break; | |
f8c6db83 | 321 | case 'O': |
322 | if (strcmp(optarg, "check") == 0) | |
3bcced4c | 323 | muxclient_command = SSHMUX_COMMAND_ALIVE_CHECK; |
f8c6db83 | 324 | else if (strcmp(optarg, "exit") == 0) |
3bcced4c | 325 | muxclient_command = SSHMUX_COMMAND_TERMINATE; |
f8c6db83 | 326 | else |
327 | fatal("Invalid multiplex command."); | |
328 | break; | |
e59404d1 | 329 | case 'P': /* deprecated */ |
5260325f | 330 | options.use_privileged_port = 0; |
331 | break; | |
5260325f | 332 | case 'a': |
333 | options.forward_agent = 0; | |
334 | break; | |
71276795 | 335 | case 'A': |
336 | options.forward_agent = 1; | |
337 | break; | |
5260325f | 338 | case 'k': |
f7926e97 | 339 | options.gss_deleg_creds = 0; |
5260325f | 340 | break; |
b2f4d5cc | 341 | case 'K': |
342 | options.gss_authentication = 1; | |
343 | options.gss_deleg_creds = 1; | |
344 | break; | |
5260325f | 345 | case 'i': |
346 | if (stat(optarg, &st) < 0) { | |
f5a1a01a | 347 | fprintf(stderr, "Warning: Identity file %s " |
ec304d66 | 348 | "not accessible: %s.\n", optarg, |
349 | strerror(errno)); | |
5260325f | 350 | break; |
351 | } | |
f5a1a01a | 352 | if (options.num_identity_files >= |
353 | SSH_MAX_IDENTITY_FILES) | |
354 | fatal("Too many identity files specified " | |
355 | "(max %d)", SSH_MAX_IDENTITY_FILES); | |
356 | options.identity_files[options.num_identity_files++] = | |
357 | xstrdup(optarg); | |
5260325f | 358 | break; |
383546c4 | 359 | case 'I': |
360 | #ifdef SMARTCARD | |
9ff6f66f | 361 | options.smartcard_device = xstrdup(optarg); |
dd2495cb | 362 | #else |
383546c4 | 363 | fprintf(stderr, "no support for smartcards.\n"); |
dd2495cb | 364 | #endif |
383546c4 | 365 | break; |
5260325f | 366 | case 't': |
8abcdba4 | 367 | if (tty_flag) |
368 | force_tty_flag = 1; | |
5260325f | 369 | tty_flag = 1; |
370 | break; | |
5260325f | 371 | case 'v': |
e053cd2c | 372 | if (debug_flag == 0) { |
bcbf86ec | 373 | debug_flag = 1; |
374 | options.log_level = SYSLOG_LEVEL_DEBUG1; | |
e053cd2c | 375 | } else { |
376 | if (options.log_level < SYSLOG_LEVEL_DEBUG3) | |
377 | options.log_level++; | |
bcbf86ec | 378 | break; |
e053cd2c | 379 | } |
59d4718a | 380 | /* FALLTHROUGH */ |
5260325f | 381 | case 'V': |
85ac7a84 | 382 | fprintf(stderr, "%s, %s\n", |
4526e8c2 | 383 | SSH_RELEASE, SSLeay_version(SSLEAY_VERSION)); |
5260325f | 384 | if (opt == 'V') |
385 | exit(0); | |
5260325f | 386 | break; |
d20f3c9e | 387 | case 'w': |
a4f24bf8 | 388 | if (options.tun_open == -1) |
389 | options.tun_open = SSH_TUNMODE_DEFAULT; | |
d20f3c9e | 390 | options.tun_local = a2tun(optarg, &options.tun_remote); |
a4f24bf8 | 391 | if (options.tun_local == SSH_TUNID_ERR) { |
e8097dc9 | 392 | fprintf(stderr, |
393 | "Bad tun device '%s'\n", optarg); | |
3aa43b24 | 394 | exit(255); |
d20f3c9e | 395 | } |
396 | break; | |
e6780883 | 397 | case 'W': |
398 | if (parse_forward(&fwd, optarg, 1, 0)) { | |
399 | stdio_forward_host = fwd.listen_host; | |
400 | stdio_forward_port = fwd.listen_port; | |
401 | xfree(fwd.connect_host); | |
402 | } else { | |
403 | fprintf(stderr, | |
404 | "Bad stdio forwarding specification '%s'\n", | |
405 | optarg); | |
406 | exit(255); | |
407 | } | |
408 | no_tty_flag = 1; | |
409 | no_shell_flag = 1; | |
410 | options.clear_forwardings = 1; | |
411 | options.exit_on_forward_failure = 1; | |
412 | break; | |
5260325f | 413 | case 'q': |
414 | options.log_level = SYSLOG_LEVEL_QUIET; | |
415 | break; | |
5260325f | 416 | case 'e': |
417 | if (optarg[0] == '^' && optarg[2] == 0 && | |
f5a1a01a | 418 | (u_char) optarg[1] >= 64 && |
419 | (u_char) optarg[1] < 128) | |
1e3b8b07 | 420 | options.escape_char = (u_char) optarg[1] & 31; |
5260325f | 421 | else if (strlen(optarg) == 1) |
1e3b8b07 | 422 | options.escape_char = (u_char) optarg[0]; |
5260325f | 423 | else if (strcmp(optarg, "none") == 0) |
4bf9c10e | 424 | options.escape_char = SSH_ESCAPECHAR_NONE; |
5260325f | 425 | else { |
f5a1a01a | 426 | fprintf(stderr, "Bad escape character '%s'.\n", |
427 | optarg); | |
3aa43b24 | 428 | exit(255); |
5260325f | 429 | } |
430 | break; | |
5260325f | 431 | case 'c': |
a306f2dd | 432 | if (ciphers_valid(optarg)) { |
433 | /* SSH2 only */ | |
434 | options.ciphers = xstrdup(optarg); | |
d77347cc | 435 | options.cipher = SSH_CIPHER_INVALID; |
a306f2dd | 436 | } else { |
437 | /* SSH1 only */ | |
c523303b | 438 | options.cipher = cipher_number(optarg); |
439 | if (options.cipher == -1) { | |
f5a1a01a | 440 | fprintf(stderr, |
441 | "Unknown cipher type '%s'\n", | |
442 | optarg); | |
3aa43b24 | 443 | exit(255); |
a306f2dd | 444 | } |
f5a1a01a | 445 | if (options.cipher == SSH_CIPHER_3DES) |
c523303b | 446 | options.ciphers = "3des-cbc"; |
f5a1a01a | 447 | else if (options.cipher == SSH_CIPHER_BLOWFISH) |
c523303b | 448 | options.ciphers = "blowfish-cbc"; |
f5a1a01a | 449 | else |
c523303b | 450 | options.ciphers = (char *)-1; |
5260325f | 451 | } |
452 | break; | |
b2552997 | 453 | case 'm': |
454 | if (mac_valid(optarg)) | |
455 | options.macs = xstrdup(optarg); | |
456 | else { | |
f5a1a01a | 457 | fprintf(stderr, "Unknown mac type '%s'\n", |
458 | optarg); | |
3aa43b24 | 459 | exit(255); |
b2552997 | 460 | } |
461 | break; | |
5e96b616 | 462 | case 'M': |
9dfd96d6 | 463 | if (options.control_master == SSHCTL_MASTER_YES) |
464 | options.control_master = SSHCTL_MASTER_ASK; | |
465 | else | |
466 | options.control_master = SSHCTL_MASTER_YES; | |
5e96b616 | 467 | break; |
5260325f | 468 | case 'p': |
2d2a2c65 | 469 | options.port = a2port(optarg); |
5134115d | 470 | if (options.port <= 0) { |
6031af8d | 471 | fprintf(stderr, "Bad port '%s'\n", optarg); |
3aa43b24 | 472 | exit(255); |
6031af8d | 473 | } |
5260325f | 474 | break; |
5260325f | 475 | case 'l': |
476 | options.user = optarg; | |
477 | break; | |
d2e3df16 | 478 | |
479 | case 'L': | |
17525a70 | 480 | if (parse_forward(&fwd, optarg, 0, 0)) |
3867aa0a | 481 | add_local_forward(&options, &fwd); |
482 | else { | |
f5a1a01a | 483 | fprintf(stderr, |
3867aa0a | 484 | "Bad local forwarding specification '%s'\n", |
f5a1a01a | 485 | optarg); |
3aa43b24 | 486 | exit(255); |
5260325f | 487 | } |
3867aa0a | 488 | break; |
489 | ||
490 | case 'R': | |
17525a70 | 491 | if (parse_forward(&fwd, optarg, 0, 1)) { |
3867aa0a | 492 | add_remote_forward(&options, &fwd); |
493 | } else { | |
f5a1a01a | 494 | fprintf(stderr, |
3867aa0a | 495 | "Bad remote forwarding specification " |
496 | "'%s'\n", optarg); | |
3aa43b24 | 497 | exit(255); |
5260325f | 498 | } |
5260325f | 499 | break; |
0490e609 | 500 | |
501 | case 'D': | |
17525a70 | 502 | if (parse_forward(&fwd, optarg, 1, 0)) { |
30573fea | 503 | add_local_forward(&options, &fwd); |
3867aa0a | 504 | } else { |
30573fea | 505 | fprintf(stderr, |
506 | "Bad dynamic forwarding specification " | |
507 | "'%s'\n", optarg); | |
3aa43b24 | 508 | exit(255); |
6031af8d | 509 | } |
0490e609 | 510 | break; |
511 | ||
5260325f | 512 | case 'C': |
513 | options.compression = 1; | |
514 | break; | |
8ce64345 | 515 | case 'N': |
516 | no_shell_flag = 1; | |
517 | no_tty_flag = 1; | |
518 | break; | |
8ce64345 | 519 | case 'T': |
520 | no_tty_flag = 1; | |
521 | break; | |
5260325f | 522 | case 'o': |
523 | dummy = 1; | |
1aafd17a | 524 | line = xstrdup(optarg); |
f5a1a01a | 525 | if (process_config_line(&options, host ? host : "", |
1aafd17a | 526 | line, "command-line", 0, &dummy) != 0) |
3aa43b24 | 527 | exit(255); |
1aafd17a | 528 | xfree(line); |
5260325f | 529 | break; |
ae810de7 | 530 | case 's': |
531 | subsystem_flag = 1; | |
532 | break; | |
5e96b616 | 533 | case 'S': |
534 | if (options.control_path != NULL) | |
535 | free(options.control_path); | |
536 | options.control_path = xstrdup(optarg); | |
5e96b616 | 537 | break; |
3435f5a6 | 538 | case 'b': |
539 | options.bind_address = optarg; | |
540 | break; | |
e591b98a | 541 | case 'F': |
542 | config = optarg; | |
543 | break; | |
5260325f | 544 | default: |
545 | usage(); | |
546 | } | |
547 | } | |
548 | ||
f5a1a01a | 549 | ac -= optind; |
550 | av += optind; | |
551 | ||
c3773c6e | 552 | if (ac > 0 && !host) { |
15748b4d | 553 | if (strrchr(*av, '@')) { |
f5a1a01a | 554 | p = xstrdup(*av); |
15748b4d | 555 | cp = strrchr(p, '@'); |
f5a1a01a | 556 | if (cp == NULL || cp == p) |
557 | usage(); | |
558 | options.user = p; | |
559 | *cp = '\0'; | |
560 | host = ++cp; | |
561 | } else | |
562 | host = *av; | |
978ebf99 | 563 | if (ac > 1) { |
564 | optind = optreset = 1; | |
f5a1a01a | 565 | goto again; |
566 | } | |
978ebf99 | 567 | ac--, av++; |
f5a1a01a | 568 | } |
569 | ||
5260325f | 570 | /* Check that we got a host name. */ |
571 | if (!host) | |
8efc0c15 | 572 | usage(); |
5260325f | 573 | |
22d89d24 | 574 | SSLeay_add_all_algorithms(); |
fa08c86b | 575 | ERR_load_crypto_strings(); |
22d89d24 | 576 | |
5260325f | 577 | /* Initialize the command to execute on remote host. */ |
578 | buffer_init(&command); | |
579 | ||
aa3378df | 580 | /* |
581 | * Save the command to execute on the remote host in a buffer. There | |
582 | * is no limit on the length of the command, except by the maximum | |
583 | * packet size. Also sets the tty flag if there is no command. | |
584 | */ | |
f5a1a01a | 585 | if (!ac) { |
5260325f | 586 | /* No command specified - execute shell on a tty. */ |
587 | tty_flag = 1; | |
ae810de7 | 588 | if (subsystem_flag) { |
f5a1a01a | 589 | fprintf(stderr, |
590 | "You must specify a subsystem to invoke.\n"); | |
ae810de7 | 591 | usage(); |
592 | } | |
5260325f | 593 | } else { |
f5a1a01a | 594 | /* A command has been specified. Store it into the buffer. */ |
595 | for (i = 0; i < ac; i++) { | |
596 | if (i) | |
5260325f | 597 | buffer_append(&command, " ", 1); |
598 | buffer_append(&command, av[i], strlen(av[i])); | |
599 | } | |
8efc0c15 | 600 | } |
5260325f | 601 | |
602 | /* Cannot fork to background if no command. */ | |
e8097dc9 | 603 | if (fork_after_authentication_flag && buffer_len(&command) == 0 && |
604 | !no_shell_flag) | |
605 | fatal("Cannot fork into background without a command " | |
606 | "to execute."); | |
5260325f | 607 | |
608 | /* Allocate a tty by default if no command specified. */ | |
609 | if (buffer_len(&command) == 0) | |
610 | tty_flag = 1; | |
611 | ||
343288b8 | 612 | /* Force no tty */ |
0b6fbf03 | 613 | if (no_tty_flag) |
614 | tty_flag = 0; | |
5260325f | 615 | /* Do not allocate a tty if stdin is not a tty. */ |
7697ac2b | 616 | if ((!isatty(fileno(stdin)) || stdin_null_flag) && !force_tty_flag) { |
5260325f | 617 | if (tty_flag) |
e8097dc9 | 618 | logit("Pseudo-terminal will not be allocated because " |
619 | "stdin is not a terminal."); | |
5260325f | 620 | tty_flag = 0; |
621 | } | |
8ce64345 | 622 | |
20244695 | 623 | /* |
624 | * Initialize "log" output. Since we are the client all output | |
625 | * actually goes to stderr. | |
626 | */ | |
f0956980 | 627 | log_init(argv0, |
e8097dc9 | 628 | options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level, |
bf793210 | 629 | SYSLOG_FACILITY_USER, !use_syslog); |
5260325f | 630 | |
e591b98a | 631 | /* |
632 | * Read per-user configuration file. Ignore the system wide config | |
633 | * file if the user specifies a config file on the command line. | |
634 | */ | |
635 | if (config != NULL) { | |
f7f14143 | 636 | if (!read_config_file(config, host, &options, 0)) |
93111dfa | 637 | fatal("Can't open user config file %.100s: " |
638 | "%.100s", config, strerror(errno)); | |
4f6e2ba9 | 639 | } else { |
0f63ab10 | 640 | r = snprintf(buf, sizeof buf, "%s/%s", pw->pw_dir, |
e591b98a | 641 | _PATH_SSH_USER_CONFFILE); |
0f63ab10 | 642 | if (r > 0 && (size_t)r < sizeof(buf)) |
643 | (void)read_config_file(buf, host, &options, 1); | |
e591b98a | 644 | |
f67792f2 | 645 | /* Read systemwide configuration file after use config. */ |
f2107e97 | 646 | (void)read_config_file(_PATH_HOST_CONFIG_FILE, host, |
9f6cab4b | 647 | &options, 0); |
e591b98a | 648 | } |
5260325f | 649 | |
650 | /* Fill configuration defaults. */ | |
651 | fill_default_options(&options); | |
652 | ||
1572b90f | 653 | channel_set_af(options.address_family); |
654 | ||
5260325f | 655 | /* reinit */ |
f0956980 | 656 | log_init(argv0, options.log_level, SYSLOG_FACILITY_USER, !use_syslog); |
5260325f | 657 | |
e339aa53 | 658 | seed_rng(); |
659 | ||
5260325f | 660 | if (options.user == NULL) |
661 | options.user = xstrdup(pw->pw_name); | |
662 | ||
e9d0b573 | 663 | /* Get default port if port has not been set. */ |
664 | if (options.port == 0) { | |
665 | sp = getservbyname(SSH_SERVICE_NAME, "tcp"); | |
666 | options.port = sp ? ntohs(sp->s_port) : SSH_DEFAULT_PORT; | |
667 | } | |
668 | ||
669 | if (options.local_command != NULL) { | |
670 | char thishost[NI_MAXHOST]; | |
671 | ||
672 | if (gethostname(thishost, sizeof(thishost)) == -1) | |
673 | fatal("gethostname: %s", strerror(errno)); | |
674 | snprintf(buf, sizeof(buf), "%d", options.port); | |
675 | debug3("expanding LocalCommand: %s", options.local_command); | |
676 | cp = options.local_command; | |
677 | options.local_command = percent_expand(cp, "d", pw->pw_dir, | |
678 | "h", options.hostname? options.hostname : host, | |
679 | "l", thishost, "n", host, "r", options.user, "p", buf, | |
680 | "u", pw->pw_name, (char *)NULL); | |
681 | debug3("expanded LocalCommand: %s", options.local_command); | |
682 | xfree(cp); | |
683 | } | |
684 | ||
5260325f | 685 | if (options.hostname != NULL) |
686 | host = options.hostname; | |
687 | ||
03c82656 | 688 | /* force lowercase for hostkey matching */ |
689 | if (options.host_key_alias != NULL) { | |
690 | for (p = options.host_key_alias; *p; p++) | |
691 | if (isupper(*p)) | |
9555d258 | 692 | *p = (char)tolower(*p); |
03c82656 | 693 | } |
694 | ||
f78bde70 | 695 | if (options.proxy_command != NULL && |
d0420e01 | 696 | strcmp(options.proxy_command, "none") == 0) { |
697 | xfree(options.proxy_command); | |
f78bde70 | 698 | options.proxy_command = NULL; |
d0420e01 | 699 | } |
699255b5 | 700 | if (options.control_path != NULL && |
d0420e01 | 701 | strcmp(options.control_path, "none") == 0) { |
702 | xfree(options.control_path); | |
699255b5 | 703 | options.control_path = NULL; |
d0420e01 | 704 | } |
f78bde70 | 705 | |
5e96b616 | 706 | if (options.control_path != NULL) { |
8cffe22a | 707 | char thishost[NI_MAXHOST]; |
f7b8224d | 708 | |
8cffe22a | 709 | if (gethostname(thishost, sizeof(thishost)) == -1) |
f7b8224d | 710 | fatal("gethostname: %s", strerror(errno)); |
a980cbd7 | 711 | snprintf(buf, sizeof(buf), "%d", options.port); |
712 | cp = tilde_expand_filename(options.control_path, | |
713 | original_real_uid); | |
d0420e01 | 714 | xfree(options.control_path); |
a980cbd7 | 715 | options.control_path = percent_expand(cp, "p", buf, "h", host, |
8cffe22a | 716 | "r", options.user, "l", thishost, (char *)NULL); |
a980cbd7 | 717 | xfree(cp); |
5e96b616 | 718 | } |
3bcced4c | 719 | if (muxclient_command != 0 && options.control_path == NULL) |
19186c3d | 720 | fatal("No ControlPath specified for \"-O\" command"); |
9dfd96d6 | 721 | if (options.control_path != NULL) |
3bcced4c | 722 | muxclient(options.control_path); |
5e96b616 | 723 | |
71300a43 | 724 | timeout_ms = options.connection_timeout * 1000; |
725 | ||
6ffc9c88 | 726 | /* Open a connection to the remote host. */ |
1572b90f | 727 | if (ssh_connect(host, &hostaddr, options.port, |
71300a43 | 728 | options.address_family, options.connection_attempts, &timeout_ms, |
729 | options.tcp_keep_alive, | |
d514c907 | 730 | #ifdef HAVE_CYGWIN |
731 | options.use_privileged_port, | |
732 | #else | |
3fb156df | 733 | original_effective_uid == 0 && options.use_privileged_port, |
d514c907 | 734 | #endif |
de60473e | 735 | options.proxy_command) != 0) |
3aa43b24 | 736 | exit(255); |
5260325f | 737 | |
71300a43 | 738 | if (timeout_ms > 0) |
739 | debug3("timeout: %d ms remain after connect", timeout_ms); | |
740 | ||
aa3378df | 741 | /* |
742 | * If we successfully made the connection, load the host private key | |
743 | * in case we will need it later for combined rsa-rhosts | |
744 | * authentication. This must be done before releasing extra | |
745 | * privileges, because the file is only readable by root. | |
78660ed4 | 746 | * If we cannot access the private keys, load the public keys |
747 | * instead and try to execute the ssh-keysign helper instead. | |
aa3378df | 748 | */ |
8002af61 | 749 | sensitive_data.nkeys = 0; |
750 | sensitive_data.keys = NULL; | |
39c00dc2 | 751 | sensitive_data.external_keysign = 0; |
b34bec32 | 752 | if (options.rhosts_rsa_authentication || |
753 | options.hostbased_authentication) { | |
8002af61 | 754 | sensitive_data.nkeys = 3; |
19e79961 | 755 | sensitive_data.keys = xcalloc(sensitive_data.nkeys, |
343288b8 | 756 | sizeof(Key)); |
3fb156df | 757 | |
758 | PRIV_START; | |
8002af61 | 759 | sensitive_data.keys[0] = key_load_private_type(KEY_RSA1, |
fc231518 | 760 | _PATH_HOST_KEY_FILE, "", NULL, NULL); |
8002af61 | 761 | sensitive_data.keys[1] = key_load_private_type(KEY_DSA, |
fc231518 | 762 | _PATH_HOST_DSA_KEY_FILE, "", NULL, NULL); |
8002af61 | 763 | sensitive_data.keys[2] = key_load_private_type(KEY_RSA, |
fc231518 | 764 | _PATH_HOST_RSA_KEY_FILE, "", NULL, NULL); |
3fb156df | 765 | PRIV_END; |
39c00dc2 | 766 | |
60cd0a97 | 767 | if (options.hostbased_authentication == 1 && |
768 | sensitive_data.keys[0] == NULL && | |
39c00dc2 | 769 | sensitive_data.keys[1] == NULL && |
770 | sensitive_data.keys[2] == NULL) { | |
771 | sensitive_data.keys[1] = key_load_public( | |
772 | _PATH_HOST_DSA_KEY_FILE, NULL); | |
773 | sensitive_data.keys[2] = key_load_public( | |
774 | _PATH_HOST_RSA_KEY_FILE, NULL); | |
775 | sensitive_data.external_keysign = 1; | |
776 | } | |
5260325f | 777 | } |
aa3378df | 778 | /* |
779 | * Get rid of any extra privileges that we may have. We will no | |
780 | * longer need them. Also, extra privileges could make it very hard | |
781 | * to read identity files and other non-world-readable files from the | |
782 | * user's home directory if it happens to be on a NFS volume where | |
783 | * root is mapped to nobody. | |
784 | */ | |
6213295d | 785 | if (original_effective_uid == 0) { |
786 | PRIV_START; | |
787 | permanently_set_uid(pw); | |
788 | } | |
5260325f | 789 | |
aa3378df | 790 | /* |
791 | * Now that we are back to our own permissions, create ~/.ssh | |
7b9b0103 | 792 | * directory if it doesn't already exist. |
aa3378df | 793 | */ |
0f63ab10 | 794 | r = snprintf(buf, sizeof buf, "%s%s%s", pw->pw_dir, |
e8097dc9 | 795 | strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR); |
0f63ab10 | 796 | if (r > 0 && (size_t)r < sizeof(buf) && stat(buf, &st) < 0) |
704b1659 | 797 | if (mkdir(buf, 0700) < 0) |
5260325f | 798 | error("Could not create directory '%.200s'.", buf); |
799 | ||
fee56204 | 800 | /* load options.identity_files */ |
801 | load_public_identity_files(); | |
802 | ||
803 | /* Expand ~ in known host file names. */ | |
804 | /* XXX mem-leaks: */ | |
fa08c86b | 805 | options.system_hostfile = |
806 | tilde_expand_filename(options.system_hostfile, original_real_uid); | |
807 | options.user_hostfile = | |
808 | tilde_expand_filename(options.user_hostfile, original_real_uid); | |
809 | options.system_hostfile2 = | |
810 | tilde_expand_filename(options.system_hostfile2, original_real_uid); | |
811 | options.user_hostfile2 = | |
812 | tilde_expand_filename(options.user_hostfile2, original_real_uid); | |
5260325f | 813 | |
67b75437 | 814 | signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */ |
815 | ||
e8097dc9 | 816 | /* Log into the remote system. Never returns if the login fails. */ |
71300a43 | 817 | ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr, |
818 | pw, timeout_ms); | |
8002af61 | 819 | |
820 | /* We no longer need the private host keys. Clear them now. */ | |
821 | if (sensitive_data.nkeys != 0) { | |
822 | for (i = 0; i < sensitive_data.nkeys; i++) { | |
823 | if (sensitive_data.keys[i] != NULL) { | |
824 | /* Destroys contents safely */ | |
825 | debug3("clear hostkey %d", i); | |
826 | key_free(sensitive_data.keys[i]); | |
827 | sensitive_data.keys[i] = NULL; | |
828 | } | |
829 | } | |
830 | xfree(sensitive_data.keys); | |
831 | } | |
05b7537a | 832 | for (i = 0; i < options.num_identity_files; i++) { |
833 | if (options.identity_files[i]) { | |
834 | xfree(options.identity_files[i]); | |
835 | options.identity_files[i] = NULL; | |
836 | } | |
837 | if (options.identity_keys[i]) { | |
838 | key_free(options.identity_keys[i]); | |
839 | options.identity_keys[i] = NULL; | |
840 | } | |
841 | } | |
5260325f | 842 | |
8ce64345 | 843 | exit_status = compat20 ? ssh_session2() : ssh_session(); |
844 | packet_close(); | |
6939bbd4 | 845 | |
3bcced4c | 846 | if (options.control_path != NULL && muxserver_sock != -1) |
5e96b616 | 847 | unlink(options.control_path); |
848 | ||
6939bbd4 | 849 | /* |
aff51935 | 850 | * Send SIGHUP to proxy command if used. We don't wait() in |
6939bbd4 | 851 | * case it hangs and instead rely on init to reap the child |
852 | */ | |
853 | if (proxy_command_pid > 1) | |
854 | kill(proxy_command_pid, SIGHUP); | |
855 | ||
8ce64345 | 856 | return exit_status; |
857 | } | |
858 | ||
72becb62 | 859 | /* Callback for remote forward global requests */ |
860 | static void | |
861 | ssh_confirm_remote_forward(int type, u_int32_t seq, void *ctxt) | |
862 | { | |
863 | Forward *rfwd = (Forward *)ctxt; | |
864 | ||
17525a70 | 865 | /* XXX verbose() on failure? */ |
72becb62 | 866 | debug("remote forward %s for: listen %d, connect %s:%d", |
867 | type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure", | |
868 | rfwd->listen_port, rfwd->connect_host, rfwd->connect_port); | |
17525a70 | 869 | if (type == SSH2_MSG_REQUEST_SUCCESS && rfwd->listen_port == 0) { |
870 | logit("Allocated port %u for remote forward to %s:%d", | |
871 | packet_get_int(), | |
872 | rfwd->connect_host, rfwd->connect_port); | |
873 | } | |
874 | ||
72becb62 | 875 | if (type == SSH2_MSG_REQUEST_FAILURE) { |
876 | if (options.exit_on_forward_failure) | |
877 | fatal("Error: remote port forwarding failed for " | |
878 | "listen port %d", rfwd->listen_port); | |
879 | else | |
880 | logit("Warning: remote port forwarding failed for " | |
881 | "listen port %d", rfwd->listen_port); | |
882 | } | |
6c777090 | 883 | if (++remote_forward_confirms_received == options.num_remote_forwards) { |
72becb62 | 884 | debug("All remote forwarding requests processed"); |
6c777090 | 885 | if (fork_after_authentication_flag) { |
886 | fork_after_authentication_flag = 0; | |
887 | if (daemon(1, 1) < 0) | |
888 | fatal("daemon() failed: %.200s", | |
889 | strerror(errno)); | |
890 | } | |
891 | } | |
72becb62 | 892 | } |
893 | ||
e6780883 | 894 | static void |
895 | client_cleanup_stdio_fwd(int id, void *arg) | |
896 | { | |
897 | debug("stdio forwarding: done"); | |
898 | cleanup_exit(0); | |
899 | } | |
900 | ||
901 | static int | |
902 | client_setup_stdio_fwd(const char *host_to_connect, u_short port_to_connect) | |
903 | { | |
904 | Channel *c; | |
905 | ||
906 | debug3("client_setup_stdio_fwd %s:%d", host_to_connect, | |
907 | port_to_connect); | |
908 | if ((c = channel_connect_stdio_fwd(host_to_connect, port_to_connect)) | |
909 | == NULL) | |
910 | return 0; | |
911 | channel_register_cleanup(c->self, client_cleanup_stdio_fwd, 0); | |
912 | return 1; | |
913 | } | |
914 | ||
396c147e | 915 | static void |
fa08c86b | 916 | ssh_init_forwarding(void) |
917 | { | |
02a024dd | 918 | int success = 0; |
fa08c86b | 919 | int i; |
02a024dd | 920 | |
e6780883 | 921 | if (stdio_forward_host != NULL) { |
922 | if (!compat20) { | |
923 | fatal("stdio forwarding require Protocol 2"); | |
924 | } | |
925 | if (!client_setup_stdio_fwd(stdio_forward_host, | |
926 | stdio_forward_port)) | |
927 | fatal("Failed to connect in stdio forward mode."); | |
928 | } | |
929 | ||
fa08c86b | 930 | /* Initiate local TCP/IP port forwardings. */ |
931 | for (i = 0; i < options.num_local_forwards; i++) { | |
3867aa0a | 932 | debug("Local connections to %.200s:%d forwarded to remote " |
933 | "address %.200s:%d", | |
f8cc7664 | 934 | (options.local_forwards[i].listen_host == NULL) ? |
935 | (options.gateway_ports ? "*" : "LOCALHOST") : | |
3867aa0a | 936 | options.local_forwards[i].listen_host, |
937 | options.local_forwards[i].listen_port, | |
938 | options.local_forwards[i].connect_host, | |
939 | options.local_forwards[i].connect_port); | |
5641aefa | 940 | success += channel_setup_local_fwd_listener( |
3867aa0a | 941 | options.local_forwards[i].listen_host, |
942 | options.local_forwards[i].listen_port, | |
943 | options.local_forwards[i].connect_host, | |
944 | options.local_forwards[i].connect_port, | |
fa08c86b | 945 | options.gateway_ports); |
946 | } | |
42ea6f5e | 947 | if (i > 0 && success != i && options.exit_on_forward_failure) |
948 | fatal("Could not request local forwarding."); | |
02a024dd | 949 | if (i > 0 && success == 0) |
950 | error("Could not request local forwarding."); | |
fa08c86b | 951 | |
952 | /* Initiate remote TCP/IP port forwardings. */ | |
953 | for (i = 0; i < options.num_remote_forwards; i++) { | |
3867aa0a | 954 | debug("Remote connections from %.200s:%d forwarded to " |
955 | "local address %.200s:%d", | |
56964485 | 956 | (options.remote_forwards[i].listen_host == NULL) ? |
aa9bc1de | 957 | "LOCALHOST" : options.remote_forwards[i].listen_host, |
3867aa0a | 958 | options.remote_forwards[i].listen_port, |
959 | options.remote_forwards[i].connect_host, | |
960 | options.remote_forwards[i].connect_port); | |
42ea6f5e | 961 | if (channel_request_remote_forwarding( |
3867aa0a | 962 | options.remote_forwards[i].listen_host, |
963 | options.remote_forwards[i].listen_port, | |
964 | options.remote_forwards[i].connect_host, | |
42ea6f5e | 965 | options.remote_forwards[i].connect_port) < 0) { |
966 | if (options.exit_on_forward_failure) | |
967 | fatal("Could not request remote forwarding."); | |
968 | else | |
969 | logit("Warning: Could not request remote " | |
970 | "forwarding."); | |
971 | } | |
72becb62 | 972 | client_register_global_confirm(ssh_confirm_remote_forward, |
973 | &options.remote_forwards[i]); | |
fa08c86b | 974 | } |
79303c5a | 975 | |
976 | /* Initiate tunnel forwarding. */ | |
977 | if (options.tun_open != SSH_TUNMODE_NO) { | |
978 | if (client_request_tun_fwd(options.tun_open, | |
979 | options.tun_local, options.tun_remote) == -1) { | |
980 | if (options.exit_on_forward_failure) | |
981 | fatal("Could not request tunnel forwarding."); | |
982 | else | |
983 | error("Could not request tunnel forwarding."); | |
984 | } | |
985 | } | |
fa08c86b | 986 | } |
987 | ||
396c147e | 988 | static void |
fa08c86b | 989 | check_agent_present(void) |
990 | { | |
991 | if (options.forward_agent) { | |
7b9b0103 | 992 | /* Clear agent forwarding if we don't have an agent. */ |
8b10e20e | 993 | if (!ssh_agent_present()) |
fa08c86b | 994 | options.forward_agent = 0; |
fa08c86b | 995 | } |
996 | } | |
997 | ||
396c147e | 998 | static int |
8ce64345 | 999 | ssh_session(void) |
1000 | { | |
1001 | int type; | |
8ce64345 | 1002 | int interactive = 0; |
1003 | int have_tty = 0; | |
1004 | struct winsize ws; | |
8ce64345 | 1005 | char *cp; |
9bf083eb | 1006 | const char *display; |
8ce64345 | 1007 | |
5260325f | 1008 | /* Enable compression if requested. */ |
1009 | if (options.compression) { | |
e8097dc9 | 1010 | debug("Requesting compression at level %d.", |
1011 | options.compression_level); | |
5260325f | 1012 | |
e8097dc9 | 1013 | if (options.compression_level < 1 || |
1014 | options.compression_level > 9) | |
1015 | fatal("Compression level must be from 1 (fast) to " | |
1016 | "9 (slow, best)."); | |
5260325f | 1017 | |
1018 | /* Send the request. */ | |
1019 | packet_start(SSH_CMSG_REQUEST_COMPRESSION); | |
1020 | packet_put_int(options.compression_level); | |
1021 | packet_send(); | |
1022 | packet_write_wait(); | |
54a5250f | 1023 | type = packet_read(); |
5260325f | 1024 | if (type == SSH_SMSG_SUCCESS) |
1025 | packet_start_compression(options.compression_level); | |
1026 | else if (type == SSH_SMSG_FAILURE) | |
bbe88b6d | 1027 | logit("Warning: Remote host refused compression."); |
5260325f | 1028 | else |
e8097dc9 | 1029 | packet_disconnect("Protocol error waiting for " |
1030 | "compression response."); | |
5260325f | 1031 | } |
1032 | /* Allocate a pseudo tty if appropriate. */ | |
1033 | if (tty_flag) { | |
1034 | debug("Requesting pty."); | |
1035 | ||
1036 | /* Start the packet. */ | |
1037 | packet_start(SSH_CMSG_REQUEST_PTY); | |
1038 | ||
1039 | /* Store TERM in the packet. There is no limit on the | |
1040 | length of the string. */ | |
1041 | cp = getenv("TERM"); | |
1042 | if (!cp) | |
1043 | cp = ""; | |
449c5ba5 | 1044 | packet_put_cstring(cp); |
5260325f | 1045 | |
1046 | /* Store window size in the packet. */ | |
1047 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) | |
1048 | memset(&ws, 0, sizeof(ws)); | |
148de80c | 1049 | packet_put_int((u_int)ws.ws_row); |
1050 | packet_put_int((u_int)ws.ws_col); | |
1051 | packet_put_int((u_int)ws.ws_xpixel); | |
1052 | packet_put_int((u_int)ws.ws_ypixel); | |
5260325f | 1053 | |
1054 | /* Store tty modes in the packet. */ | |
30dcc918 | 1055 | tty_make_modes(fileno(stdin), NULL); |
5260325f | 1056 | |
1057 | /* Send the packet, and wait for it to leave. */ | |
1058 | packet_send(); | |
1059 | packet_write_wait(); | |
1060 | ||
1061 | /* Read response from the server. */ | |
54a5250f | 1062 | type = packet_read(); |
4fe2af09 | 1063 | if (type == SSH_SMSG_SUCCESS) { |
5260325f | 1064 | interactive = 1; |
8ce64345 | 1065 | have_tty = 1; |
4fe2af09 | 1066 | } else if (type == SSH_SMSG_FAILURE) |
e8097dc9 | 1067 | logit("Warning: Remote host failed or refused to " |
1068 | "allocate a pseudo tty."); | |
5260325f | 1069 | else |
e8097dc9 | 1070 | packet_disconnect("Protocol error waiting for pty " |
1071 | "request response."); | |
5260325f | 1072 | } |
1073 | /* Request X11 forwarding if enabled and DISPLAY is set. */ | |
9bf083eb | 1074 | display = getenv("DISPLAY"); |
1075 | if (options.forward_x11 && display != NULL) { | |
b48eeb07 | 1076 | char *proto, *data; |
0b242b12 | 1077 | /* Get reasonable local authentication information. */ |
9bf083eb | 1078 | client_x11_get_proto(display, options.xauth_location, |
1079 | options.forward_x11_trusted, &proto, &data); | |
0b242b12 | 1080 | /* Request forwarding with authentication spoofing. */ |
e8097dc9 | 1081 | debug("Requesting X11 forwarding with authentication " |
1082 | "spoofing."); | |
9bf083eb | 1083 | x11_request_forwarding_with_spoofing(0, display, proto, data); |
5260325f | 1084 | |
1085 | /* Read response from the server. */ | |
54a5250f | 1086 | type = packet_read(); |
5260325f | 1087 | if (type == SSH_SMSG_SUCCESS) { |
5260325f | 1088 | interactive = 1; |
0b242b12 | 1089 | } else if (type == SSH_SMSG_FAILURE) { |
bbe88b6d | 1090 | logit("Warning: Remote host denied X11 forwarding."); |
0b242b12 | 1091 | } else { |
e8097dc9 | 1092 | packet_disconnect("Protocol error waiting for X11 " |
1093 | "forwarding"); | |
0b242b12 | 1094 | } |
5260325f | 1095 | } |
1096 | /* Tell the packet module whether this is an interactive session. */ | |
b5c334cc | 1097 | packet_set_interactive(interactive); |
5260325f | 1098 | |
1099 | /* Request authentication agent forwarding if appropriate. */ | |
fa08c86b | 1100 | check_agent_present(); |
1101 | ||
5260325f | 1102 | if (options.forward_agent) { |
1103 | debug("Requesting authentication agent forwarding."); | |
1104 | auth_request_forwarding(); | |
1105 | ||
1106 | /* Read response from the server. */ | |
54a5250f | 1107 | type = packet_read(); |
95500969 | 1108 | packet_check_eom(); |
5260325f | 1109 | if (type != SSH_SMSG_SUCCESS) |
bbe88b6d | 1110 | logit("Warning: Remote host denied authentication agent forwarding."); |
5260325f | 1111 | } |
8efc0c15 | 1112 | |
fa08c86b | 1113 | /* Initiate port forwardings. */ |
1114 | ssh_init_forwarding(); | |
5260325f | 1115 | |
c80e7e5d | 1116 | /* Execute a local command */ |
1117 | if (options.local_command != NULL && | |
1118 | options.permit_local_command) | |
1119 | ssh_local_cmd(options.local_command); | |
1120 | ||
6c777090 | 1121 | /* |
1122 | * If requested and we are not interested in replies to remote | |
1123 | * forwarding requests, then let ssh continue in the background. | |
1124 | */ | |
1125 | if (fork_after_authentication_flag && | |
1126 | (!options.exit_on_forward_failure || | |
1127 | options.num_remote_forwards == 0)) { | |
1128 | fork_after_authentication_flag = 0; | |
aa3378df | 1129 | if (daemon(1, 1) < 0) |
1130 | fatal("daemon() failed: %.200s", strerror(errno)); | |
6c777090 | 1131 | } |
aa3378df | 1132 | |
1133 | /* | |
1134 | * If a command was specified on the command line, execute the | |
1135 | * command now. Otherwise request the server to start a shell. | |
1136 | */ | |
5260325f | 1137 | if (buffer_len(&command) > 0) { |
1138 | int len = buffer_len(&command); | |
1139 | if (len > 900) | |
1140 | len = 900; | |
e8097dc9 | 1141 | debug("Sending command: %.*s", len, |
1142 | (u_char *)buffer_ptr(&command)); | |
5260325f | 1143 | packet_start(SSH_CMSG_EXEC_CMD); |
1144 | packet_put_string(buffer_ptr(&command), buffer_len(&command)); | |
1145 | packet_send(); | |
1146 | packet_write_wait(); | |
1147 | } else { | |
1148 | debug("Requesting shell."); | |
1149 | packet_start(SSH_CMSG_EXEC_SHELL); | |
1150 | packet_send(); | |
1151 | packet_write_wait(); | |
1152 | } | |
1153 | ||
1154 | /* Enter the interactive session. */ | |
4bf9c10e | 1155 | return client_loop(have_tty, tty_flag ? |
1156 | options.escape_char : SSH_ESCAPECHAR_NONE, 0); | |
8ce64345 | 1157 | } |
5260325f | 1158 | |
5e96b616 | 1159 | /* request pty/x11/agent/tcpfwd/shell for channel */ |
1160 | static void | |
1161 | ssh_session2_setup(int id, void *arg) | |
1162 | { | |
1786be35 | 1163 | extern char **environ; |
9bf083eb | 1164 | const char *display; |
5e96b616 | 1165 | int interactive = tty_flag; |
9bf083eb | 1166 | |
56964485 | 1167 | display = getenv("DISPLAY"); |
9bf083eb | 1168 | if (options.forward_x11 && display != NULL) { |
b48eeb07 | 1169 | char *proto, *data; |
0b242b12 | 1170 | /* Get reasonable local authentication information. */ |
9bf083eb | 1171 | client_x11_get_proto(display, options.xauth_location, |
1172 | options.forward_x11_trusted, &proto, &data); | |
0b242b12 | 1173 | /* Request forwarding with authentication spoofing. */ |
e8097dc9 | 1174 | debug("Requesting X11 forwarding with authentication " |
1175 | "spoofing."); | |
9bf083eb | 1176 | x11_request_forwarding_with_spoofing(id, display, proto, data); |
b5c334cc | 1177 | interactive = 1; |
0b242b12 | 1178 | /* XXX wait for reply */ |
1179 | } | |
1180 | ||
fa08c86b | 1181 | check_agent_present(); |
1182 | if (options.forward_agent) { | |
1183 | debug("Requesting authentication agent forwarding."); | |
1184 | channel_request_start(id, "auth-agent-req@openssh.com", 0); | |
1185 | packet_send(); | |
1186 | } | |
1187 | ||
5e96b616 | 1188 | client_session2_setup(id, tty_flag, subsystem_flag, getenv("TERM"), |
95d3c124 | 1189 | NULL, fileno(stdin), &command, environ); |
1f3bf5aa | 1190 | |
b5c334cc | 1191 | packet_set_interactive(interactive); |
8ce64345 | 1192 | } |
1193 | ||
bcdb96c2 | 1194 | /* open new channel for a session */ |
396c147e | 1195 | static int |
bcdb96c2 | 1196 | ssh_session2_open(void) |
8ce64345 | 1197 | { |
719fc62f | 1198 | Channel *c; |
1199 | int window, packetmax, in, out, err; | |
2e73a022 | 1200 | |
14a9a859 | 1201 | if (stdin_null_flag) { |
5ca51e19 | 1202 | in = open(_PATH_DEVNULL, O_RDONLY); |
14a9a859 | 1203 | } else { |
1204 | in = dup(STDIN_FILENO); | |
1205 | } | |
2e73a022 | 1206 | out = dup(STDOUT_FILENO); |
1207 | err = dup(STDERR_FILENO); | |
8ce64345 | 1208 | |
1209 | if (in < 0 || out < 0 || err < 0) | |
14a9a859 | 1210 | fatal("dup() in/out/err failed"); |
8ce64345 | 1211 | |
a22aff1f | 1212 | /* enable nonblocking unless tty */ |
1213 | if (!isatty(in)) | |
1214 | set_nonblock(in); | |
1215 | if (!isatty(out)) | |
1216 | set_nonblock(out); | |
1217 | if (!isatty(err)) | |
1218 | set_nonblock(err); | |
1219 | ||
bcbf86ec | 1220 | window = CHAN_SES_WINDOW_DEFAULT; |
1221 | packetmax = CHAN_SES_PACKET_DEFAULT; | |
ea9700ba | 1222 | if (tty_flag) { |
1223 | window >>= 1; | |
1224 | packetmax >>= 1; | |
8ce64345 | 1225 | } |
719fc62f | 1226 | c = channel_new( |
8ce64345 | 1227 | "session", SSH_CHANNEL_OPENING, in, out, err, |
bcbf86ec | 1228 | window, packetmax, CHAN_EXTENDED_WRITE, |
0d942eff | 1229 | "client-session", /*nonblock*/0); |
8ce64345 | 1230 | |
bcdb96c2 | 1231 | debug3("ssh_session2_open: channel_new: %d", c->self); |
eb0dd41f | 1232 | |
36e1f6a1 | 1233 | channel_send_open(c->self); |
bcdb96c2 | 1234 | if (!no_shell_flag) |
3593bdc0 | 1235 | channel_register_open_confirm(c->self, |
1236 | ssh_session2_setup, NULL); | |
5260325f | 1237 | |
719fc62f | 1238 | return c->self; |
eb0dd41f | 1239 | } |
1240 | ||
396c147e | 1241 | static int |
eb0dd41f | 1242 | ssh_session2(void) |
1243 | { | |
bcdb96c2 | 1244 | int id = -1; |
eb0dd41f | 1245 | |
1246 | /* XXX should be pre-session */ | |
1247 | ssh_init_forwarding(); | |
1248 | ||
bcdb96c2 | 1249 | if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN)) |
1250 | id = ssh_session2_open(); | |
eb0dd41f | 1251 | |
3f0444ca | 1252 | /* If we don't expect to open a new session, then disallow it */ |
72bd2fca | 1253 | if (options.control_master == SSHCTL_MASTER_NO && |
1254 | (datafellows & SSH_NEW_OPENSSH)) { | |
3f0444ca | 1255 | debug("Requesting no-more-sessions@openssh.com"); |
1256 | packet_start(SSH2_MSG_GLOBAL_REQUEST); | |
1257 | packet_put_cstring("no-more-sessions@openssh.com"); | |
1258 | packet_put_char(0); | |
1259 | packet_send(); | |
1260 | } | |
1261 | ||
d20f3c9e | 1262 | /* Execute a local command */ |
1263 | if (options.local_command != NULL && | |
1264 | options.permit_local_command) | |
1265 | ssh_local_cmd(options.local_command); | |
1266 | ||
79303c5a | 1267 | /* Start listening for multiplex clients */ |
3bcced4c | 1268 | muxserver_listen(); |
79303c5a | 1269 | |
eb0dd41f | 1270 | /* If requested, let ssh continue in the background. */ |
6c777090 | 1271 | if (fork_after_authentication_flag) { |
1272 | fork_after_authentication_flag = 0; | |
eb0dd41f | 1273 | if (daemon(1, 1) < 0) |
1274 | fatal("daemon() failed: %.200s", strerror(errno)); | |
6c777090 | 1275 | } |
eb0dd41f | 1276 | |
1cb94277 | 1277 | if (options.use_roaming) |
1278 | request_roaming(); | |
1279 | ||
4bf9c10e | 1280 | return client_loop(tty_flag, tty_flag ? |
1281 | options.escape_char : SSH_ESCAPECHAR_NONE, id); | |
8efc0c15 | 1282 | } |
fa08c86b | 1283 | |
396c147e | 1284 | static void |
fee56204 | 1285 | load_public_identity_files(void) |
1286 | { | |
8cffe22a | 1287 | char *filename, *cp, thishost[NI_MAXHOST]; |
a7082e17 | 1288 | char *pwdir = NULL, *pwname = NULL; |
2e23cde0 | 1289 | int i = 0; |
0659cace | 1290 | Key *public; |
8cffe22a | 1291 | struct passwd *pw; |
383546c4 | 1292 | #ifdef SMARTCARD |
0659cace | 1293 | Key **keys; |
1294 | ||
9ff6f66f | 1295 | if (options.smartcard_device != NULL && |
0659cace | 1296 | options.num_identity_files < SSH_MAX_IDENTITY_FILES && |
d4f40d92 | 1297 | (keys = sc_get_keys(options.smartcard_device, NULL)) != NULL) { |
0659cace | 1298 | int count = 0; |
1299 | for (i = 0; keys[i] != NULL; i++) { | |
1300 | count++; | |
e8097dc9 | 1301 | memmove(&options.identity_files[1], |
1302 | &options.identity_files[0], | |
0659cace | 1303 | sizeof(char *) * (SSH_MAX_IDENTITY_FILES - 1)); |
e8097dc9 | 1304 | memmove(&options.identity_keys[1], |
1305 | &options.identity_keys[0], | |
0659cace | 1306 | sizeof(Key *) * (SSH_MAX_IDENTITY_FILES - 1)); |
1307 | options.num_identity_files++; | |
1308 | options.identity_keys[0] = keys[i]; | |
244e796f | 1309 | options.identity_files[0] = sc_get_key_label(keys[i]); |
0659cace | 1310 | } |
1c2deed1 | 1311 | if (options.num_identity_files > SSH_MAX_IDENTITY_FILES) |
1312 | options.num_identity_files = SSH_MAX_IDENTITY_FILES; | |
0659cace | 1313 | i = count; |
1314 | xfree(keys); | |
383546c4 | 1315 | } |
3e984472 | 1316 | #endif /* SMARTCARD */ |
8cffe22a | 1317 | if ((pw = getpwuid(original_real_uid)) == NULL) |
1318 | fatal("load_public_identity_files: getpwuid failed"); | |
42f4b33f | 1319 | pwname = xstrdup(pw->pw_name); |
1320 | pwdir = xstrdup(pw->pw_dir); | |
8cffe22a | 1321 | if (gethostname(thishost, sizeof(thishost)) == -1) |
1322 | fatal("load_public_identity_files: gethostname: %s", | |
1323 | strerror(errno)); | |
2e23cde0 | 1324 | for (; i < options.num_identity_files; i++) { |
8cffe22a | 1325 | cp = tilde_expand_filename(options.identity_files[i], |
2e23cde0 | 1326 | original_real_uid); |
a7082e17 | 1327 | filename = percent_expand(cp, "d", pwdir, |
1328 | "u", pwname, "l", thishost, "h", host, | |
8cffe22a | 1329 | "r", options.user, (char *)NULL); |
1330 | xfree(cp); | |
2e23cde0 | 1331 | public = key_load_public(filename, NULL); |
1332 | debug("identity file %s type %d", filename, | |
1333 | public ? public->type : -1); | |
1334 | xfree(options.identity_files[i]); | |
1335 | options.identity_files[i] = filename; | |
1336 | options.identity_keys[i] = public; | |
1337 | } | |
a7082e17 | 1338 | bzero(pwname, strlen(pwname)); |
42f4b33f | 1339 | xfree(pwname); |
a7082e17 | 1340 | bzero(pwdir, strlen(pwdir)); |
42f4b33f | 1341 | xfree(pwdir); |
fee56204 | 1342 | } |