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bf793210 | 1 | /* $OpenBSD: ssh.c,v 1.320 2008/10/08 23:34:03 djm 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> |
5b04a8bf | 51 | #include <sys/socket.h> |
a75f5360 | 52 | |
b6438382 | 53 | #include <ctype.h> |
dd984467 | 54 | #include <errno.h> |
d3221cca | 55 | #include <fcntl.h> |
28cb0a43 | 56 | #include <netdb.h> |
b5b88c19 | 57 | #ifdef HAVE_PATHS_H |
a75f5360 | 58 | #include <paths.h> |
b5b88c19 | 59 | #endif |
b1842393 | 60 | #include <pwd.h> |
ada68823 | 61 | #include <signal.h> |
24436b92 | 62 | #include <stdarg.h> |
bcaab305 | 63 | #include <stddef.h> |
cf851879 | 64 | #include <stdio.h> |
ffa517a8 | 65 | #include <stdlib.h> |
00146caa | 66 | #include <string.h> |
5188ba17 | 67 | #include <unistd.h> |
8efc0c15 | 68 | |
5e837c7b | 69 | #include <netinet/in.h> |
70 | #include <arpa/inet.h> | |
71 | ||
a306f2dd | 72 | #include <openssl/evp.h> |
fa08c86b | 73 | #include <openssl/err.h> |
f5f25d17 | 74 | #include "openbsd-compat/openssl-compat.h" |
3593bdc0 | 75 | #include "openbsd-compat/sys-queue.h" |
a306f2dd | 76 | |
31652869 | 77 | #include "xmalloc.h" |
8efc0c15 | 78 | #include "ssh.h" |
42f11eb2 | 79 | #include "ssh1.h" |
80 | #include "ssh2.h" | |
81 | #include "compat.h" | |
82 | #include "cipher.h" | |
8efc0c15 | 83 | #include "packet.h" |
84 | #include "buffer.h" | |
a5efa1bb | 85 | #include "channels.h" |
a306f2dd | 86 | #include "key.h" |
4c8722d9 | 87 | #include "authfd.h" |
a306f2dd | 88 | #include "authfile.h" |
42f11eb2 | 89 | #include "pathnames.h" |
5e96b616 | 90 | #include "dispatch.h" |
b5c334cc | 91 | #include "clientloop.h" |
42f11eb2 | 92 | #include "log.h" |
93 | #include "readconf.h" | |
94 | #include "sshconnect.h" | |
42f11eb2 | 95 | #include "misc.h" |
b2552997 | 96 | #include "kex.h" |
97 | #include "mac.h" | |
07d80252 | 98 | #include "sshpty.h" |
61a2c1da | 99 | #include "match.h" |
5e96b616 | 100 | #include "msg.h" |
6213295d | 101 | #include "uidswap.h" |
28015df4 | 102 | #include "version.h" |
8efc0c15 | 103 | |
383546c4 | 104 | #ifdef SMARTCARD |
383546c4 | 105 | #include "scard.h" |
dd2495cb | 106 | #endif |
383546c4 | 107 | |
f601d847 | 108 | extern char *__progname; |
f601d847 | 109 | |
e8097dc9 | 110 | /* Flag indicating whether debug mode is on. May be set on the command line. */ |
8efc0c15 | 111 | int debug_flag = 0; |
112 | ||
a8be9f80 | 113 | /* Flag indicating whether a tty should be allocated */ |
8efc0c15 | 114 | int tty_flag = 0; |
8abcdba4 | 115 | int no_tty_flag = 0; |
116 | int force_tty_flag = 0; | |
8efc0c15 | 117 | |
8ce64345 | 118 | /* don't exec a shell */ |
119 | int no_shell_flag = 0; | |
8ce64345 | 120 | |
aa3378df | 121 | /* |
122 | * Flag indicating that nothing should be read from stdin. This can be set | |
123 | * on the command line. | |
124 | */ | |
8efc0c15 | 125 | int stdin_null_flag = 0; |
126 | ||
aa3378df | 127 | /* |
128 | * Flag indicating that ssh should fork after authentication. This is useful | |
c242fc96 | 129 | * so that the passphrase can be entered manually, and then ssh goes to the |
aa3378df | 130 | * background. |
131 | */ | |
8efc0c15 | 132 | int fork_after_authentication_flag = 0; |
133 | ||
aa3378df | 134 | /* |
135 | * General data structure for command line options and options configurable | |
136 | * in configuration files. See readconf.h. | |
137 | */ | |
8efc0c15 | 138 | Options options; |
139 | ||
e591b98a | 140 | /* optional user configfile */ |
141 | char *config = NULL; | |
142 | ||
aa3378df | 143 | /* |
144 | * Name of the host we are connecting to. This is the name given on the | |
145 | * command line, or the HostName specified for the user-supplied name in a | |
146 | * configuration file. | |
147 | */ | |
8efc0c15 | 148 | char *host; |
149 | ||
150 | /* socket address the host resolves to */ | |
48e671d5 | 151 | struct sockaddr_storage hostaddr; |
8efc0c15 | 152 | |
8002af61 | 153 | /* Private host keys. */ |
39c00dc2 | 154 | Sensitive sensitive_data; |
8efc0c15 | 155 | |
156 | /* Original real UID. */ | |
157 | uid_t original_real_uid; | |
3fb156df | 158 | uid_t original_effective_uid; |
8efc0c15 | 159 | |
8ce64345 | 160 | /* command to be executed */ |
161 | Buffer command; | |
162 | ||
ae810de7 | 163 | /* Should we execute a command or invoke a subsystem? */ |
164 | int subsystem_flag = 0; | |
165 | ||
e0ae8728 | 166 | /* # of replies received for global requests */ |
72becb62 | 167 | static int remote_forward_confirms_received = 0; |
e0ae8728 | 168 | |
6939bbd4 | 169 | /* pid of proxycommand child process */ |
170 | pid_t proxy_command_pid = 0; | |
171 | ||
3bcced4c | 172 | /* mux.c */ |
173 | extern int muxserver_sock; | |
174 | extern u_int muxclient_command; | |
5e96b616 | 175 | |
8efc0c15 | 176 | /* Prints a help message to the user. This function never returns. */ |
177 | ||
396c147e | 178 | static void |
5ca51e19 | 179 | usage(void) |
8efc0c15 | 180 | { |
182ccbba | 181 | fprintf(stderr, |
b2f4d5cc | 182 | "usage: ssh [-1246AaCfgKkMNnqsTtVvXxY] [-b bind_address] [-c cipher_spec]\n" |
80e29ee6 | 183 | " [-D [bind_address:]port] [-e escape_char] [-F configfile]\n" |
8cf98c65 | 184 | " [-i identity_file] [-L [bind_address:]port:host:hostport]\n" |
3867aa0a | 185 | " [-l login_name] [-m mac_spec] [-O ctl_cmd] [-o option] [-p port]\n" |
8cf98c65 | 186 | " [-R [bind_address:]port:host:hostport] [-S ctl_path]\n" |
06fa4ac1 | 187 | " [-w local_tun[:remote_tun]] [user@]hostname [command]\n" |
182ccbba | 188 | ); |
3aa43b24 | 189 | exit(255); |
8efc0c15 | 190 | } |
191 | ||
396c147e | 192 | static int ssh_session(void); |
193 | static int ssh_session2(void); | |
194 | static void load_public_identity_files(void); | |
3bcced4c | 195 | |
196 | /* from muxclient.c */ | |
197 | void muxclient(const char *); | |
198 | void muxserver_listen(void); | |
8ce64345 | 199 | |
5260325f | 200 | /* |
201 | * Main program for the ssh client. | |
202 | */ | |
8efc0c15 | 203 | int |
204 | main(int ac, char **av) | |
205 | { | |
bf793210 | 206 | int i, opt, exit_status, use_syslog; |
1aafd17a | 207 | char *p, *cp, *line, buf[256]; |
5260325f | 208 | struct stat st; |
3b1a83df | 209 | struct passwd *pw; |
71300a43 | 210 | int dummy, timeout_ms; |
57dade33 | 211 | extern int optind, optreset; |
1812a662 | 212 | extern char *optarg; |
c1cbe68a | 213 | struct servent *sp; |
3867aa0a | 214 | Forward fwd; |
5260325f | 215 | |
fd6168c1 | 216 | /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ |
217 | sanitise_stdfd(); | |
218 | ||
fda04d7d | 219 | __progname = ssh_get_progname(av[0]); |
264dce47 | 220 | init_rng(); |
221 | ||
aa3378df | 222 | /* |
223 | * Save the original real uid. It will be needed later (uid-swapping | |
224 | * may clobber the real uid). | |
225 | */ | |
5260325f | 226 | original_real_uid = getuid(); |
227 | original_effective_uid = geteuid(); | |
aff51935 | 228 | |
9f324470 | 229 | /* |
230 | * Use uid-swapping to give up root privileges for the duration of | |
231 | * option processing. We will re-instantiate the rights when we are | |
232 | * ready to create the privileged port, and will permanently drop | |
233 | * them when the port has been created (actually, when the connection | |
234 | * has been made, as we may need to create the port several times). | |
235 | */ | |
236 | PRIV_END; | |
5260325f | 237 | |
7322ef0e | 238 | #ifdef HAVE_SETRLIMIT |
5260325f | 239 | /* If we are installed setuid root be careful to not drop core. */ |
240 | if (original_real_uid != original_effective_uid) { | |
241 | struct rlimit rlim; | |
242 | rlim.rlim_cur = rlim.rlim_max = 0; | |
243 | if (setrlimit(RLIMIT_CORE, &rlim) < 0) | |
244 | fatal("setrlimit failed: %.100s", strerror(errno)); | |
8efc0c15 | 245 | } |
3c62e7eb | 246 | #endif |
63bd8c36 | 247 | /* Get user data. */ |
248 | pw = getpwuid(original_real_uid); | |
249 | if (!pw) { | |
bbe88b6d | 250 | logit("You don't exist, go away!"); |
3aa43b24 | 251 | exit(255); |
63bd8c36 | 252 | } |
253 | /* Take a copy of the returned structure. */ | |
254 | pw = pwcopy(pw); | |
255 | ||
aa3378df | 256 | /* |
257 | * Set our umask to something reasonable, as some files are created | |
258 | * with the default umask. This will make them world-readable but | |
259 | * writable only by the owner, which is ok for all files for which we | |
260 | * don't set the modes explicitly. | |
261 | */ | |
5260325f | 262 | umask(022); |
263 | ||
e8097dc9 | 264 | /* |
265 | * Initialize option structure to indicate that no values have been | |
266 | * set. | |
267 | */ | |
5260325f | 268 | initialize_options(&options); |
269 | ||
270 | /* Parse command-line arguments. */ | |
271 | host = NULL; | |
bf793210 | 272 | use_syslog = 0; |
5260325f | 273 | |
16a5525d | 274 | again: |
e8097dc9 | 275 | while ((opt = getopt(ac, av, "1246ab:c:e:fgi:kl:m:no:p:qstvx" |
bf793210 | 276 | "ACD:F:I:KL:MNO:PR:S:TVw:XYy")) != -1) { |
5260325f | 277 | switch (opt) { |
1f3bf5aa | 278 | case '1': |
279 | options.protocol = SSH_PROTO_1; | |
280 | break; | |
6ae2364d | 281 | case '2': |
282 | options.protocol = SSH_PROTO_2; | |
283 | break; | |
48e671d5 | 284 | case '4': |
1572b90f | 285 | options.address_family = AF_INET; |
48e671d5 | 286 | break; |
48e671d5 | 287 | case '6': |
1572b90f | 288 | options.address_family = AF_INET6; |
48e671d5 | 289 | break; |
5260325f | 290 | case 'n': |
291 | stdin_null_flag = 1; | |
292 | break; | |
5260325f | 293 | case 'f': |
294 | fork_after_authentication_flag = 1; | |
295 | stdin_null_flag = 1; | |
296 | break; | |
5260325f | 297 | case 'x': |
298 | options.forward_x11 = 0; | |
299 | break; | |
5260325f | 300 | case 'X': |
301 | options.forward_x11 = 1; | |
302 | break; | |
bf793210 | 303 | case 'y': |
304 | use_syslog = 1; | |
305 | break; | |
d73a67d7 | 306 | case 'Y': |
307 | options.forward_x11 = 1; | |
308 | options.forward_x11_trusted = 1; | |
309 | break; | |
5260325f | 310 | case 'g': |
311 | options.gateway_ports = 1; | |
312 | break; | |
f8c6db83 | 313 | case 'O': |
314 | if (strcmp(optarg, "check") == 0) | |
3bcced4c | 315 | muxclient_command = SSHMUX_COMMAND_ALIVE_CHECK; |
f8c6db83 | 316 | else if (strcmp(optarg, "exit") == 0) |
3bcced4c | 317 | muxclient_command = SSHMUX_COMMAND_TERMINATE; |
f8c6db83 | 318 | else |
319 | fatal("Invalid multiplex command."); | |
320 | break; | |
e59404d1 | 321 | case 'P': /* deprecated */ |
5260325f | 322 | options.use_privileged_port = 0; |
323 | break; | |
5260325f | 324 | case 'a': |
325 | options.forward_agent = 0; | |
326 | break; | |
71276795 | 327 | case 'A': |
328 | options.forward_agent = 1; | |
329 | break; | |
5260325f | 330 | case 'k': |
f7926e97 | 331 | options.gss_deleg_creds = 0; |
5260325f | 332 | break; |
b2f4d5cc | 333 | case 'K': |
334 | options.gss_authentication = 1; | |
335 | options.gss_deleg_creds = 1; | |
336 | break; | |
5260325f | 337 | case 'i': |
338 | if (stat(optarg, &st) < 0) { | |
f5a1a01a | 339 | fprintf(stderr, "Warning: Identity file %s " |
ec304d66 | 340 | "not accessible: %s.\n", optarg, |
341 | strerror(errno)); | |
5260325f | 342 | break; |
343 | } | |
f5a1a01a | 344 | if (options.num_identity_files >= |
345 | SSH_MAX_IDENTITY_FILES) | |
346 | fatal("Too many identity files specified " | |
347 | "(max %d)", SSH_MAX_IDENTITY_FILES); | |
348 | options.identity_files[options.num_identity_files++] = | |
349 | xstrdup(optarg); | |
5260325f | 350 | break; |
383546c4 | 351 | case 'I': |
352 | #ifdef SMARTCARD | |
9ff6f66f | 353 | options.smartcard_device = xstrdup(optarg); |
dd2495cb | 354 | #else |
383546c4 | 355 | fprintf(stderr, "no support for smartcards.\n"); |
dd2495cb | 356 | #endif |
383546c4 | 357 | break; |
5260325f | 358 | case 't': |
8abcdba4 | 359 | if (tty_flag) |
360 | force_tty_flag = 1; | |
5260325f | 361 | tty_flag = 1; |
362 | break; | |
5260325f | 363 | case 'v': |
e053cd2c | 364 | if (debug_flag == 0) { |
bcbf86ec | 365 | debug_flag = 1; |
366 | options.log_level = SYSLOG_LEVEL_DEBUG1; | |
e053cd2c | 367 | } else { |
368 | if (options.log_level < SYSLOG_LEVEL_DEBUG3) | |
369 | options.log_level++; | |
bcbf86ec | 370 | break; |
e053cd2c | 371 | } |
59d4718a | 372 | /* FALLTHROUGH */ |
5260325f | 373 | case 'V': |
85ac7a84 | 374 | fprintf(stderr, "%s, %s\n", |
4526e8c2 | 375 | SSH_RELEASE, SSLeay_version(SSLEAY_VERSION)); |
5260325f | 376 | if (opt == 'V') |
377 | exit(0); | |
5260325f | 378 | break; |
d20f3c9e | 379 | case 'w': |
a4f24bf8 | 380 | if (options.tun_open == -1) |
381 | options.tun_open = SSH_TUNMODE_DEFAULT; | |
d20f3c9e | 382 | options.tun_local = a2tun(optarg, &options.tun_remote); |
a4f24bf8 | 383 | if (options.tun_local == SSH_TUNID_ERR) { |
e8097dc9 | 384 | fprintf(stderr, |
385 | "Bad tun device '%s'\n", optarg); | |
3aa43b24 | 386 | exit(255); |
d20f3c9e | 387 | } |
388 | break; | |
5260325f | 389 | case 'q': |
390 | options.log_level = SYSLOG_LEVEL_QUIET; | |
391 | break; | |
5260325f | 392 | case 'e': |
393 | if (optarg[0] == '^' && optarg[2] == 0 && | |
f5a1a01a | 394 | (u_char) optarg[1] >= 64 && |
395 | (u_char) optarg[1] < 128) | |
1e3b8b07 | 396 | options.escape_char = (u_char) optarg[1] & 31; |
5260325f | 397 | else if (strlen(optarg) == 1) |
1e3b8b07 | 398 | options.escape_char = (u_char) optarg[0]; |
5260325f | 399 | else if (strcmp(optarg, "none") == 0) |
4bf9c10e | 400 | options.escape_char = SSH_ESCAPECHAR_NONE; |
5260325f | 401 | else { |
f5a1a01a | 402 | fprintf(stderr, "Bad escape character '%s'.\n", |
403 | optarg); | |
3aa43b24 | 404 | exit(255); |
5260325f | 405 | } |
406 | break; | |
5260325f | 407 | case 'c': |
a306f2dd | 408 | if (ciphers_valid(optarg)) { |
409 | /* SSH2 only */ | |
410 | options.ciphers = xstrdup(optarg); | |
d77347cc | 411 | options.cipher = SSH_CIPHER_INVALID; |
a306f2dd | 412 | } else { |
413 | /* SSH1 only */ | |
c523303b | 414 | options.cipher = cipher_number(optarg); |
415 | if (options.cipher == -1) { | |
f5a1a01a | 416 | fprintf(stderr, |
417 | "Unknown cipher type '%s'\n", | |
418 | optarg); | |
3aa43b24 | 419 | exit(255); |
a306f2dd | 420 | } |
f5a1a01a | 421 | if (options.cipher == SSH_CIPHER_3DES) |
c523303b | 422 | options.ciphers = "3des-cbc"; |
f5a1a01a | 423 | else if (options.cipher == SSH_CIPHER_BLOWFISH) |
c523303b | 424 | options.ciphers = "blowfish-cbc"; |
f5a1a01a | 425 | else |
c523303b | 426 | options.ciphers = (char *)-1; |
5260325f | 427 | } |
428 | break; | |
b2552997 | 429 | case 'm': |
430 | if (mac_valid(optarg)) | |
431 | options.macs = xstrdup(optarg); | |
432 | else { | |
f5a1a01a | 433 | fprintf(stderr, "Unknown mac type '%s'\n", |
434 | optarg); | |
3aa43b24 | 435 | exit(255); |
b2552997 | 436 | } |
437 | break; | |
5e96b616 | 438 | case 'M': |
9dfd96d6 | 439 | if (options.control_master == SSHCTL_MASTER_YES) |
440 | options.control_master = SSHCTL_MASTER_ASK; | |
441 | else | |
442 | options.control_master = SSHCTL_MASTER_YES; | |
5e96b616 | 443 | break; |
5260325f | 444 | case 'p': |
2d2a2c65 | 445 | options.port = a2port(optarg); |
446 | if (options.port == 0) { | |
6031af8d | 447 | fprintf(stderr, "Bad port '%s'\n", optarg); |
3aa43b24 | 448 | exit(255); |
6031af8d | 449 | } |
5260325f | 450 | break; |
5260325f | 451 | case 'l': |
452 | options.user = optarg; | |
453 | break; | |
d2e3df16 | 454 | |
455 | case 'L': | |
3867aa0a | 456 | if (parse_forward(&fwd, optarg)) |
457 | add_local_forward(&options, &fwd); | |
458 | else { | |
f5a1a01a | 459 | fprintf(stderr, |
3867aa0a | 460 | "Bad local forwarding specification '%s'\n", |
f5a1a01a | 461 | optarg); |
3aa43b24 | 462 | exit(255); |
5260325f | 463 | } |
3867aa0a | 464 | break; |
465 | ||
466 | case 'R': | |
467 | if (parse_forward(&fwd, optarg)) { | |
468 | add_remote_forward(&options, &fwd); | |
469 | } else { | |
f5a1a01a | 470 | fprintf(stderr, |
3867aa0a | 471 | "Bad remote forwarding specification " |
472 | "'%s'\n", optarg); | |
3aa43b24 | 473 | exit(255); |
5260325f | 474 | } |
5260325f | 475 | break; |
0490e609 | 476 | |
477 | case 'D': | |
3867aa0a | 478 | cp = p = xstrdup(optarg); |
479 | memset(&fwd, '\0', sizeof(fwd)); | |
480 | fwd.connect_host = "socks"; | |
481 | if ((fwd.listen_host = hpdelim(&cp)) == NULL) { | |
482 | fprintf(stderr, "Bad dynamic forwarding " | |
483 | "specification '%.100s'\n", optarg); | |
3aa43b24 | 484 | exit(255); |
3867aa0a | 485 | } |
486 | if (cp != NULL) { | |
487 | fwd.listen_port = a2port(cp); | |
e8097dc9 | 488 | fwd.listen_host = |
489 | cleanhostname(fwd.listen_host); | |
3867aa0a | 490 | } else { |
491 | fwd.listen_port = a2port(fwd.listen_host); | |
7c840747 | 492 | fwd.listen_host = NULL; |
3867aa0a | 493 | } |
494 | ||
495 | if (fwd.listen_port == 0) { | |
f5a1a01a | 496 | fprintf(stderr, "Bad dynamic port '%s'\n", |
497 | optarg); | |
3aa43b24 | 498 | exit(255); |
6031af8d | 499 | } |
3867aa0a | 500 | add_local_forward(&options, &fwd); |
501 | xfree(p); | |
0490e609 | 502 | break; |
503 | ||
5260325f | 504 | case 'C': |
505 | options.compression = 1; | |
506 | break; | |
8ce64345 | 507 | case 'N': |
508 | no_shell_flag = 1; | |
509 | no_tty_flag = 1; | |
510 | break; | |
8ce64345 | 511 | case 'T': |
512 | no_tty_flag = 1; | |
513 | break; | |
5260325f | 514 | case 'o': |
515 | dummy = 1; | |
1aafd17a | 516 | line = xstrdup(optarg); |
f5a1a01a | 517 | if (process_config_line(&options, host ? host : "", |
1aafd17a | 518 | line, "command-line", 0, &dummy) != 0) |
3aa43b24 | 519 | exit(255); |
1aafd17a | 520 | xfree(line); |
5260325f | 521 | break; |
ae810de7 | 522 | case 's': |
523 | subsystem_flag = 1; | |
524 | break; | |
5e96b616 | 525 | case 'S': |
526 | if (options.control_path != NULL) | |
527 | free(options.control_path); | |
528 | options.control_path = xstrdup(optarg); | |
5e96b616 | 529 | break; |
3435f5a6 | 530 | case 'b': |
531 | options.bind_address = optarg; | |
532 | break; | |
e591b98a | 533 | case 'F': |
534 | config = optarg; | |
535 | break; | |
5260325f | 536 | default: |
537 | usage(); | |
538 | } | |
539 | } | |
540 | ||
f5a1a01a | 541 | ac -= optind; |
542 | av += optind; | |
543 | ||
544 | if (ac > 0 && !host && **av != '-') { | |
15748b4d | 545 | if (strrchr(*av, '@')) { |
f5a1a01a | 546 | p = xstrdup(*av); |
15748b4d | 547 | cp = strrchr(p, '@'); |
f5a1a01a | 548 | if (cp == NULL || cp == p) |
549 | usage(); | |
550 | options.user = p; | |
551 | *cp = '\0'; | |
552 | host = ++cp; | |
553 | } else | |
554 | host = *av; | |
978ebf99 | 555 | if (ac > 1) { |
556 | optind = optreset = 1; | |
f5a1a01a | 557 | goto again; |
558 | } | |
978ebf99 | 559 | ac--, av++; |
f5a1a01a | 560 | } |
561 | ||
5260325f | 562 | /* Check that we got a host name. */ |
563 | if (!host) | |
8efc0c15 | 564 | usage(); |
5260325f | 565 | |
22d89d24 | 566 | SSLeay_add_all_algorithms(); |
fa08c86b | 567 | ERR_load_crypto_strings(); |
22d89d24 | 568 | |
5260325f | 569 | /* Initialize the command to execute on remote host. */ |
570 | buffer_init(&command); | |
571 | ||
aa3378df | 572 | /* |
573 | * Save the command to execute on the remote host in a buffer. There | |
574 | * is no limit on the length of the command, except by the maximum | |
575 | * packet size. Also sets the tty flag if there is no command. | |
576 | */ | |
f5a1a01a | 577 | if (!ac) { |
5260325f | 578 | /* No command specified - execute shell on a tty. */ |
579 | tty_flag = 1; | |
ae810de7 | 580 | if (subsystem_flag) { |
f5a1a01a | 581 | fprintf(stderr, |
582 | "You must specify a subsystem to invoke.\n"); | |
ae810de7 | 583 | usage(); |
584 | } | |
5260325f | 585 | } else { |
f5a1a01a | 586 | /* A command has been specified. Store it into the buffer. */ |
587 | for (i = 0; i < ac; i++) { | |
588 | if (i) | |
5260325f | 589 | buffer_append(&command, " ", 1); |
590 | buffer_append(&command, av[i], strlen(av[i])); | |
591 | } | |
8efc0c15 | 592 | } |
5260325f | 593 | |
594 | /* Cannot fork to background if no command. */ | |
e8097dc9 | 595 | if (fork_after_authentication_flag && buffer_len(&command) == 0 && |
596 | !no_shell_flag) | |
597 | fatal("Cannot fork into background without a command " | |
598 | "to execute."); | |
5260325f | 599 | |
600 | /* Allocate a tty by default if no command specified. */ | |
601 | if (buffer_len(&command) == 0) | |
602 | tty_flag = 1; | |
603 | ||
343288b8 | 604 | /* Force no tty */ |
0b6fbf03 | 605 | if (no_tty_flag) |
606 | tty_flag = 0; | |
5260325f | 607 | /* Do not allocate a tty if stdin is not a tty. */ |
7697ac2b | 608 | if ((!isatty(fileno(stdin)) || stdin_null_flag) && !force_tty_flag) { |
5260325f | 609 | if (tty_flag) |
e8097dc9 | 610 | logit("Pseudo-terminal will not be allocated because " |
611 | "stdin is not a terminal."); | |
5260325f | 612 | tty_flag = 0; |
613 | } | |
8ce64345 | 614 | |
20244695 | 615 | /* |
616 | * Initialize "log" output. Since we are the client all output | |
617 | * actually goes to stderr. | |
618 | */ | |
e8097dc9 | 619 | log_init(av[0], |
620 | options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level, | |
bf793210 | 621 | SYSLOG_FACILITY_USER, !use_syslog); |
5260325f | 622 | |
e591b98a | 623 | /* |
624 | * Read per-user configuration file. Ignore the system wide config | |
625 | * file if the user specifies a config file on the command line. | |
626 | */ | |
627 | if (config != NULL) { | |
f7f14143 | 628 | if (!read_config_file(config, host, &options, 0)) |
93111dfa | 629 | fatal("Can't open user config file %.100s: " |
630 | "%.100s", config, strerror(errno)); | |
4f6e2ba9 | 631 | } else { |
e591b98a | 632 | snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, |
633 | _PATH_SSH_USER_CONFFILE); | |
9f6cab4b | 634 | (void)read_config_file(buf, host, &options, 1); |
e591b98a | 635 | |
f67792f2 | 636 | /* Read systemwide configuration file after use config. */ |
f2107e97 | 637 | (void)read_config_file(_PATH_HOST_CONFIG_FILE, host, |
9f6cab4b | 638 | &options, 0); |
e591b98a | 639 | } |
5260325f | 640 | |
641 | /* Fill configuration defaults. */ | |
642 | fill_default_options(&options); | |
643 | ||
1572b90f | 644 | channel_set_af(options.address_family); |
645 | ||
5260325f | 646 | /* reinit */ |
bf793210 | 647 | log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, !use_syslog); |
5260325f | 648 | |
e339aa53 | 649 | seed_rng(); |
650 | ||
5260325f | 651 | if (options.user == NULL) |
652 | options.user = xstrdup(pw->pw_name); | |
653 | ||
e9d0b573 | 654 | /* Get default port if port has not been set. */ |
655 | if (options.port == 0) { | |
656 | sp = getservbyname(SSH_SERVICE_NAME, "tcp"); | |
657 | options.port = sp ? ntohs(sp->s_port) : SSH_DEFAULT_PORT; | |
658 | } | |
659 | ||
660 | if (options.local_command != NULL) { | |
661 | char thishost[NI_MAXHOST]; | |
662 | ||
663 | if (gethostname(thishost, sizeof(thishost)) == -1) | |
664 | fatal("gethostname: %s", strerror(errno)); | |
665 | snprintf(buf, sizeof(buf), "%d", options.port); | |
666 | debug3("expanding LocalCommand: %s", options.local_command); | |
667 | cp = options.local_command; | |
668 | options.local_command = percent_expand(cp, "d", pw->pw_dir, | |
669 | "h", options.hostname? options.hostname : host, | |
670 | "l", thishost, "n", host, "r", options.user, "p", buf, | |
671 | "u", pw->pw_name, (char *)NULL); | |
672 | debug3("expanded LocalCommand: %s", options.local_command); | |
673 | xfree(cp); | |
674 | } | |
675 | ||
5260325f | 676 | if (options.hostname != NULL) |
677 | host = options.hostname; | |
678 | ||
03c82656 | 679 | /* force lowercase for hostkey matching */ |
680 | if (options.host_key_alias != NULL) { | |
681 | for (p = options.host_key_alias; *p; p++) | |
682 | if (isupper(*p)) | |
9555d258 | 683 | *p = (char)tolower(*p); |
03c82656 | 684 | } |
685 | ||
f78bde70 | 686 | if (options.proxy_command != NULL && |
d0420e01 | 687 | strcmp(options.proxy_command, "none") == 0) { |
688 | xfree(options.proxy_command); | |
f78bde70 | 689 | options.proxy_command = NULL; |
d0420e01 | 690 | } |
699255b5 | 691 | if (options.control_path != NULL && |
d0420e01 | 692 | strcmp(options.control_path, "none") == 0) { |
693 | xfree(options.control_path); | |
699255b5 | 694 | options.control_path = NULL; |
d0420e01 | 695 | } |
f78bde70 | 696 | |
5e96b616 | 697 | if (options.control_path != NULL) { |
8cffe22a | 698 | char thishost[NI_MAXHOST]; |
f7b8224d | 699 | |
8cffe22a | 700 | if (gethostname(thishost, sizeof(thishost)) == -1) |
f7b8224d | 701 | fatal("gethostname: %s", strerror(errno)); |
a980cbd7 | 702 | snprintf(buf, sizeof(buf), "%d", options.port); |
703 | cp = tilde_expand_filename(options.control_path, | |
704 | original_real_uid); | |
d0420e01 | 705 | xfree(options.control_path); |
a980cbd7 | 706 | options.control_path = percent_expand(cp, "p", buf, "h", host, |
8cffe22a | 707 | "r", options.user, "l", thishost, (char *)NULL); |
a980cbd7 | 708 | xfree(cp); |
5e96b616 | 709 | } |
3bcced4c | 710 | if (muxclient_command != 0 && options.control_path == NULL) |
19186c3d | 711 | fatal("No ControlPath specified for \"-O\" command"); |
9dfd96d6 | 712 | if (options.control_path != NULL) |
3bcced4c | 713 | muxclient(options.control_path); |
5e96b616 | 714 | |
71300a43 | 715 | timeout_ms = options.connection_timeout * 1000; |
716 | ||
6ffc9c88 | 717 | /* Open a connection to the remote host. */ |
1572b90f | 718 | if (ssh_connect(host, &hostaddr, options.port, |
71300a43 | 719 | options.address_family, options.connection_attempts, &timeout_ms, |
720 | options.tcp_keep_alive, | |
d514c907 | 721 | #ifdef HAVE_CYGWIN |
722 | options.use_privileged_port, | |
723 | #else | |
3fb156df | 724 | original_effective_uid == 0 && options.use_privileged_port, |
d514c907 | 725 | #endif |
de60473e | 726 | options.proxy_command) != 0) |
3aa43b24 | 727 | exit(255); |
5260325f | 728 | |
71300a43 | 729 | if (timeout_ms > 0) |
730 | debug3("timeout: %d ms remain after connect", timeout_ms); | |
731 | ||
aa3378df | 732 | /* |
733 | * If we successfully made the connection, load the host private key | |
734 | * in case we will need it later for combined rsa-rhosts | |
735 | * authentication. This must be done before releasing extra | |
736 | * privileges, because the file is only readable by root. | |
78660ed4 | 737 | * If we cannot access the private keys, load the public keys |
738 | * instead and try to execute the ssh-keysign helper instead. | |
aa3378df | 739 | */ |
8002af61 | 740 | sensitive_data.nkeys = 0; |
741 | sensitive_data.keys = NULL; | |
39c00dc2 | 742 | sensitive_data.external_keysign = 0; |
b34bec32 | 743 | if (options.rhosts_rsa_authentication || |
744 | options.hostbased_authentication) { | |
8002af61 | 745 | sensitive_data.nkeys = 3; |
19e79961 | 746 | sensitive_data.keys = xcalloc(sensitive_data.nkeys, |
343288b8 | 747 | sizeof(Key)); |
3fb156df | 748 | |
749 | PRIV_START; | |
8002af61 | 750 | sensitive_data.keys[0] = key_load_private_type(KEY_RSA1, |
fc231518 | 751 | _PATH_HOST_KEY_FILE, "", NULL, NULL); |
8002af61 | 752 | sensitive_data.keys[1] = key_load_private_type(KEY_DSA, |
fc231518 | 753 | _PATH_HOST_DSA_KEY_FILE, "", NULL, NULL); |
8002af61 | 754 | sensitive_data.keys[2] = key_load_private_type(KEY_RSA, |
fc231518 | 755 | _PATH_HOST_RSA_KEY_FILE, "", NULL, NULL); |
3fb156df | 756 | PRIV_END; |
39c00dc2 | 757 | |
60cd0a97 | 758 | if (options.hostbased_authentication == 1 && |
759 | sensitive_data.keys[0] == NULL && | |
39c00dc2 | 760 | sensitive_data.keys[1] == NULL && |
761 | sensitive_data.keys[2] == NULL) { | |
762 | sensitive_data.keys[1] = key_load_public( | |
763 | _PATH_HOST_DSA_KEY_FILE, NULL); | |
764 | sensitive_data.keys[2] = key_load_public( | |
765 | _PATH_HOST_RSA_KEY_FILE, NULL); | |
766 | sensitive_data.external_keysign = 1; | |
767 | } | |
5260325f | 768 | } |
aa3378df | 769 | /* |
770 | * Get rid of any extra privileges that we may have. We will no | |
771 | * longer need them. Also, extra privileges could make it very hard | |
772 | * to read identity files and other non-world-readable files from the | |
773 | * user's home directory if it happens to be on a NFS volume where | |
774 | * root is mapped to nobody. | |
775 | */ | |
6213295d | 776 | if (original_effective_uid == 0) { |
777 | PRIV_START; | |
778 | permanently_set_uid(pw); | |
779 | } | |
5260325f | 780 | |
aa3378df | 781 | /* |
782 | * Now that we are back to our own permissions, create ~/.ssh | |
7b9b0103 | 783 | * directory if it doesn't already exist. |
aa3378df | 784 | */ |
e8097dc9 | 785 | snprintf(buf, sizeof buf, "%.100s%s%.100s", pw->pw_dir, |
786 | strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR); | |
5260325f | 787 | if (stat(buf, &st) < 0) |
704b1659 | 788 | if (mkdir(buf, 0700) < 0) |
5260325f | 789 | error("Could not create directory '%.200s'.", buf); |
790 | ||
fee56204 | 791 | /* load options.identity_files */ |
792 | load_public_identity_files(); | |
793 | ||
794 | /* Expand ~ in known host file names. */ | |
795 | /* XXX mem-leaks: */ | |
fa08c86b | 796 | options.system_hostfile = |
797 | tilde_expand_filename(options.system_hostfile, original_real_uid); | |
798 | options.user_hostfile = | |
799 | tilde_expand_filename(options.user_hostfile, original_real_uid); | |
800 | options.system_hostfile2 = | |
801 | tilde_expand_filename(options.system_hostfile2, original_real_uid); | |
802 | options.user_hostfile2 = | |
803 | tilde_expand_filename(options.user_hostfile2, original_real_uid); | |
5260325f | 804 | |
67b75437 | 805 | signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */ |
806 | ||
e8097dc9 | 807 | /* Log into the remote system. Never returns if the login fails. */ |
71300a43 | 808 | ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr, |
809 | pw, timeout_ms); | |
8002af61 | 810 | |
811 | /* We no longer need the private host keys. Clear them now. */ | |
812 | if (sensitive_data.nkeys != 0) { | |
813 | for (i = 0; i < sensitive_data.nkeys; i++) { | |
814 | if (sensitive_data.keys[i] != NULL) { | |
815 | /* Destroys contents safely */ | |
816 | debug3("clear hostkey %d", i); | |
817 | key_free(sensitive_data.keys[i]); | |
818 | sensitive_data.keys[i] = NULL; | |
819 | } | |
820 | } | |
821 | xfree(sensitive_data.keys); | |
822 | } | |
05b7537a | 823 | for (i = 0; i < options.num_identity_files; i++) { |
824 | if (options.identity_files[i]) { | |
825 | xfree(options.identity_files[i]); | |
826 | options.identity_files[i] = NULL; | |
827 | } | |
828 | if (options.identity_keys[i]) { | |
829 | key_free(options.identity_keys[i]); | |
830 | options.identity_keys[i] = NULL; | |
831 | } | |
832 | } | |
5260325f | 833 | |
8ce64345 | 834 | exit_status = compat20 ? ssh_session2() : ssh_session(); |
835 | packet_close(); | |
6939bbd4 | 836 | |
3bcced4c | 837 | if (options.control_path != NULL && muxserver_sock != -1) |
5e96b616 | 838 | unlink(options.control_path); |
839 | ||
6939bbd4 | 840 | /* |
aff51935 | 841 | * Send SIGHUP to proxy command if used. We don't wait() in |
6939bbd4 | 842 | * case it hangs and instead rely on init to reap the child |
843 | */ | |
844 | if (proxy_command_pid > 1) | |
845 | kill(proxy_command_pid, SIGHUP); | |
846 | ||
8ce64345 | 847 | return exit_status; |
848 | } | |
849 | ||
72becb62 | 850 | /* Callback for remote forward global requests */ |
851 | static void | |
852 | ssh_confirm_remote_forward(int type, u_int32_t seq, void *ctxt) | |
853 | { | |
854 | Forward *rfwd = (Forward *)ctxt; | |
855 | ||
856 | debug("remote forward %s for: listen %d, connect %s:%d", | |
857 | type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure", | |
858 | rfwd->listen_port, rfwd->connect_host, rfwd->connect_port); | |
859 | if (type == SSH2_MSG_REQUEST_FAILURE) { | |
860 | if (options.exit_on_forward_failure) | |
861 | fatal("Error: remote port forwarding failed for " | |
862 | "listen port %d", rfwd->listen_port); | |
863 | else | |
864 | logit("Warning: remote port forwarding failed for " | |
865 | "listen port %d", rfwd->listen_port); | |
866 | } | |
6c777090 | 867 | if (++remote_forward_confirms_received == options.num_remote_forwards) { |
72becb62 | 868 | debug("All remote forwarding requests processed"); |
6c777090 | 869 | if (fork_after_authentication_flag) { |
870 | fork_after_authentication_flag = 0; | |
871 | if (daemon(1, 1) < 0) | |
872 | fatal("daemon() failed: %.200s", | |
873 | strerror(errno)); | |
874 | } | |
875 | } | |
72becb62 | 876 | } |
877 | ||
396c147e | 878 | static void |
fa08c86b | 879 | ssh_init_forwarding(void) |
880 | { | |
02a024dd | 881 | int success = 0; |
fa08c86b | 882 | int i; |
02a024dd | 883 | |
fa08c86b | 884 | /* Initiate local TCP/IP port forwardings. */ |
885 | for (i = 0; i < options.num_local_forwards; i++) { | |
3867aa0a | 886 | debug("Local connections to %.200s:%d forwarded to remote " |
887 | "address %.200s:%d", | |
f8cc7664 | 888 | (options.local_forwards[i].listen_host == NULL) ? |
889 | (options.gateway_ports ? "*" : "LOCALHOST") : | |
3867aa0a | 890 | options.local_forwards[i].listen_host, |
891 | options.local_forwards[i].listen_port, | |
892 | options.local_forwards[i].connect_host, | |
893 | options.local_forwards[i].connect_port); | |
5641aefa | 894 | success += channel_setup_local_fwd_listener( |
3867aa0a | 895 | options.local_forwards[i].listen_host, |
896 | options.local_forwards[i].listen_port, | |
897 | options.local_forwards[i].connect_host, | |
898 | options.local_forwards[i].connect_port, | |
fa08c86b | 899 | options.gateway_ports); |
900 | } | |
42ea6f5e | 901 | if (i > 0 && success != i && options.exit_on_forward_failure) |
902 | fatal("Could not request local forwarding."); | |
02a024dd | 903 | if (i > 0 && success == 0) |
904 | error("Could not request local forwarding."); | |
fa08c86b | 905 | |
906 | /* Initiate remote TCP/IP port forwardings. */ | |
907 | for (i = 0; i < options.num_remote_forwards; i++) { | |
3867aa0a | 908 | debug("Remote connections from %.200s:%d forwarded to " |
909 | "local address %.200s:%d", | |
56964485 | 910 | (options.remote_forwards[i].listen_host == NULL) ? |
aa9bc1de | 911 | "LOCALHOST" : options.remote_forwards[i].listen_host, |
3867aa0a | 912 | options.remote_forwards[i].listen_port, |
913 | options.remote_forwards[i].connect_host, | |
914 | options.remote_forwards[i].connect_port); | |
42ea6f5e | 915 | if (channel_request_remote_forwarding( |
3867aa0a | 916 | options.remote_forwards[i].listen_host, |
917 | options.remote_forwards[i].listen_port, | |
918 | options.remote_forwards[i].connect_host, | |
42ea6f5e | 919 | options.remote_forwards[i].connect_port) < 0) { |
920 | if (options.exit_on_forward_failure) | |
921 | fatal("Could not request remote forwarding."); | |
922 | else | |
923 | logit("Warning: Could not request remote " | |
924 | "forwarding."); | |
925 | } | |
72becb62 | 926 | client_register_global_confirm(ssh_confirm_remote_forward, |
927 | &options.remote_forwards[i]); | |
fa08c86b | 928 | } |
79303c5a | 929 | |
930 | /* Initiate tunnel forwarding. */ | |
931 | if (options.tun_open != SSH_TUNMODE_NO) { | |
932 | if (client_request_tun_fwd(options.tun_open, | |
933 | options.tun_local, options.tun_remote) == -1) { | |
934 | if (options.exit_on_forward_failure) | |
935 | fatal("Could not request tunnel forwarding."); | |
936 | else | |
937 | error("Could not request tunnel forwarding."); | |
938 | } | |
939 | } | |
fa08c86b | 940 | } |
941 | ||
396c147e | 942 | static void |
fa08c86b | 943 | check_agent_present(void) |
944 | { | |
945 | if (options.forward_agent) { | |
7b9b0103 | 946 | /* Clear agent forwarding if we don't have an agent. */ |
8b10e20e | 947 | if (!ssh_agent_present()) |
fa08c86b | 948 | options.forward_agent = 0; |
fa08c86b | 949 | } |
950 | } | |
951 | ||
396c147e | 952 | static int |
8ce64345 | 953 | ssh_session(void) |
954 | { | |
955 | int type; | |
8ce64345 | 956 | int interactive = 0; |
957 | int have_tty = 0; | |
958 | struct winsize ws; | |
8ce64345 | 959 | char *cp; |
9bf083eb | 960 | const char *display; |
8ce64345 | 961 | |
5260325f | 962 | /* Enable compression if requested. */ |
963 | if (options.compression) { | |
e8097dc9 | 964 | debug("Requesting compression at level %d.", |
965 | options.compression_level); | |
5260325f | 966 | |
e8097dc9 | 967 | if (options.compression_level < 1 || |
968 | options.compression_level > 9) | |
969 | fatal("Compression level must be from 1 (fast) to " | |
970 | "9 (slow, best)."); | |
5260325f | 971 | |
972 | /* Send the request. */ | |
973 | packet_start(SSH_CMSG_REQUEST_COMPRESSION); | |
974 | packet_put_int(options.compression_level); | |
975 | packet_send(); | |
976 | packet_write_wait(); | |
54a5250f | 977 | type = packet_read(); |
5260325f | 978 | if (type == SSH_SMSG_SUCCESS) |
979 | packet_start_compression(options.compression_level); | |
980 | else if (type == SSH_SMSG_FAILURE) | |
bbe88b6d | 981 | logit("Warning: Remote host refused compression."); |
5260325f | 982 | else |
e8097dc9 | 983 | packet_disconnect("Protocol error waiting for " |
984 | "compression response."); | |
5260325f | 985 | } |
986 | /* Allocate a pseudo tty if appropriate. */ | |
987 | if (tty_flag) { | |
988 | debug("Requesting pty."); | |
989 | ||
990 | /* Start the packet. */ | |
991 | packet_start(SSH_CMSG_REQUEST_PTY); | |
992 | ||
993 | /* Store TERM in the packet. There is no limit on the | |
994 | length of the string. */ | |
995 | cp = getenv("TERM"); | |
996 | if (!cp) | |
997 | cp = ""; | |
449c5ba5 | 998 | packet_put_cstring(cp); |
5260325f | 999 | |
1000 | /* Store window size in the packet. */ | |
1001 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) | |
1002 | memset(&ws, 0, sizeof(ws)); | |
148de80c | 1003 | packet_put_int((u_int)ws.ws_row); |
1004 | packet_put_int((u_int)ws.ws_col); | |
1005 | packet_put_int((u_int)ws.ws_xpixel); | |
1006 | packet_put_int((u_int)ws.ws_ypixel); | |
5260325f | 1007 | |
1008 | /* Store tty modes in the packet. */ | |
30dcc918 | 1009 | tty_make_modes(fileno(stdin), NULL); |
5260325f | 1010 | |
1011 | /* Send the packet, and wait for it to leave. */ | |
1012 | packet_send(); | |
1013 | packet_write_wait(); | |
1014 | ||
1015 | /* Read response from the server. */ | |
54a5250f | 1016 | type = packet_read(); |
4fe2af09 | 1017 | if (type == SSH_SMSG_SUCCESS) { |
5260325f | 1018 | interactive = 1; |
8ce64345 | 1019 | have_tty = 1; |
4fe2af09 | 1020 | } else if (type == SSH_SMSG_FAILURE) |
e8097dc9 | 1021 | logit("Warning: Remote host failed or refused to " |
1022 | "allocate a pseudo tty."); | |
5260325f | 1023 | else |
e8097dc9 | 1024 | packet_disconnect("Protocol error waiting for pty " |
1025 | "request response."); | |
5260325f | 1026 | } |
1027 | /* Request X11 forwarding if enabled and DISPLAY is set. */ | |
9bf083eb | 1028 | display = getenv("DISPLAY"); |
1029 | if (options.forward_x11 && display != NULL) { | |
b48eeb07 | 1030 | char *proto, *data; |
0b242b12 | 1031 | /* Get reasonable local authentication information. */ |
9bf083eb | 1032 | client_x11_get_proto(display, options.xauth_location, |
1033 | options.forward_x11_trusted, &proto, &data); | |
0b242b12 | 1034 | /* Request forwarding with authentication spoofing. */ |
e8097dc9 | 1035 | debug("Requesting X11 forwarding with authentication " |
1036 | "spoofing."); | |
9bf083eb | 1037 | x11_request_forwarding_with_spoofing(0, display, proto, data); |
5260325f | 1038 | |
1039 | /* Read response from the server. */ | |
54a5250f | 1040 | type = packet_read(); |
5260325f | 1041 | if (type == SSH_SMSG_SUCCESS) { |
5260325f | 1042 | interactive = 1; |
0b242b12 | 1043 | } else if (type == SSH_SMSG_FAILURE) { |
bbe88b6d | 1044 | logit("Warning: Remote host denied X11 forwarding."); |
0b242b12 | 1045 | } else { |
e8097dc9 | 1046 | packet_disconnect("Protocol error waiting for X11 " |
1047 | "forwarding"); | |
0b242b12 | 1048 | } |
5260325f | 1049 | } |
1050 | /* Tell the packet module whether this is an interactive session. */ | |
b5c334cc | 1051 | packet_set_interactive(interactive); |
5260325f | 1052 | |
1053 | /* Request authentication agent forwarding if appropriate. */ | |
fa08c86b | 1054 | check_agent_present(); |
1055 | ||
5260325f | 1056 | if (options.forward_agent) { |
1057 | debug("Requesting authentication agent forwarding."); | |
1058 | auth_request_forwarding(); | |
1059 | ||
1060 | /* Read response from the server. */ | |
54a5250f | 1061 | type = packet_read(); |
95500969 | 1062 | packet_check_eom(); |
5260325f | 1063 | if (type != SSH_SMSG_SUCCESS) |
bbe88b6d | 1064 | logit("Warning: Remote host denied authentication agent forwarding."); |
5260325f | 1065 | } |
8efc0c15 | 1066 | |
fa08c86b | 1067 | /* Initiate port forwardings. */ |
1068 | ssh_init_forwarding(); | |
5260325f | 1069 | |
c80e7e5d | 1070 | /* Execute a local command */ |
1071 | if (options.local_command != NULL && | |
1072 | options.permit_local_command) | |
1073 | ssh_local_cmd(options.local_command); | |
1074 | ||
6c777090 | 1075 | /* |
1076 | * If requested and we are not interested in replies to remote | |
1077 | * forwarding requests, then let ssh continue in the background. | |
1078 | */ | |
1079 | if (fork_after_authentication_flag && | |
1080 | (!options.exit_on_forward_failure || | |
1081 | options.num_remote_forwards == 0)) { | |
1082 | fork_after_authentication_flag = 0; | |
aa3378df | 1083 | if (daemon(1, 1) < 0) |
1084 | fatal("daemon() failed: %.200s", strerror(errno)); | |
6c777090 | 1085 | } |
aa3378df | 1086 | |
1087 | /* | |
1088 | * If a command was specified on the command line, execute the | |
1089 | * command now. Otherwise request the server to start a shell. | |
1090 | */ | |
5260325f | 1091 | if (buffer_len(&command) > 0) { |
1092 | int len = buffer_len(&command); | |
1093 | if (len > 900) | |
1094 | len = 900; | |
e8097dc9 | 1095 | debug("Sending command: %.*s", len, |
1096 | (u_char *)buffer_ptr(&command)); | |
5260325f | 1097 | packet_start(SSH_CMSG_EXEC_CMD); |
1098 | packet_put_string(buffer_ptr(&command), buffer_len(&command)); | |
1099 | packet_send(); | |
1100 | packet_write_wait(); | |
1101 | } else { | |
1102 | debug("Requesting shell."); | |
1103 | packet_start(SSH_CMSG_EXEC_SHELL); | |
1104 | packet_send(); | |
1105 | packet_write_wait(); | |
1106 | } | |
1107 | ||
1108 | /* Enter the interactive session. */ | |
4bf9c10e | 1109 | return client_loop(have_tty, tty_flag ? |
1110 | options.escape_char : SSH_ESCAPECHAR_NONE, 0); | |
8ce64345 | 1111 | } |
5260325f | 1112 | |
5e96b616 | 1113 | /* request pty/x11/agent/tcpfwd/shell for channel */ |
1114 | static void | |
1115 | ssh_session2_setup(int id, void *arg) | |
1116 | { | |
1786be35 | 1117 | extern char **environ; |
9bf083eb | 1118 | const char *display; |
5e96b616 | 1119 | int interactive = tty_flag; |
9bf083eb | 1120 | |
56964485 | 1121 | display = getenv("DISPLAY"); |
9bf083eb | 1122 | if (options.forward_x11 && display != NULL) { |
b48eeb07 | 1123 | char *proto, *data; |
0b242b12 | 1124 | /* Get reasonable local authentication information. */ |
9bf083eb | 1125 | client_x11_get_proto(display, options.xauth_location, |
1126 | options.forward_x11_trusted, &proto, &data); | |
0b242b12 | 1127 | /* Request forwarding with authentication spoofing. */ |
e8097dc9 | 1128 | debug("Requesting X11 forwarding with authentication " |
1129 | "spoofing."); | |
9bf083eb | 1130 | x11_request_forwarding_with_spoofing(id, display, proto, data); |
b5c334cc | 1131 | interactive = 1; |
0b242b12 | 1132 | /* XXX wait for reply */ |
1133 | } | |
1134 | ||
fa08c86b | 1135 | check_agent_present(); |
1136 | if (options.forward_agent) { | |
1137 | debug("Requesting authentication agent forwarding."); | |
1138 | channel_request_start(id, "auth-agent-req@openssh.com", 0); | |
1139 | packet_send(); | |
1140 | } | |
1141 | ||
5e96b616 | 1142 | client_session2_setup(id, tty_flag, subsystem_flag, getenv("TERM"), |
95d3c124 | 1143 | NULL, fileno(stdin), &command, environ); |
1f3bf5aa | 1144 | |
b5c334cc | 1145 | packet_set_interactive(interactive); |
8ce64345 | 1146 | } |
1147 | ||
bcdb96c2 | 1148 | /* open new channel for a session */ |
396c147e | 1149 | static int |
bcdb96c2 | 1150 | ssh_session2_open(void) |
8ce64345 | 1151 | { |
719fc62f | 1152 | Channel *c; |
1153 | int window, packetmax, in, out, err; | |
2e73a022 | 1154 | |
14a9a859 | 1155 | if (stdin_null_flag) { |
5ca51e19 | 1156 | in = open(_PATH_DEVNULL, O_RDONLY); |
14a9a859 | 1157 | } else { |
1158 | in = dup(STDIN_FILENO); | |
1159 | } | |
2e73a022 | 1160 | out = dup(STDOUT_FILENO); |
1161 | err = dup(STDERR_FILENO); | |
8ce64345 | 1162 | |
1163 | if (in < 0 || out < 0 || err < 0) | |
14a9a859 | 1164 | fatal("dup() in/out/err failed"); |
8ce64345 | 1165 | |
a22aff1f | 1166 | /* enable nonblocking unless tty */ |
1167 | if (!isatty(in)) | |
1168 | set_nonblock(in); | |
1169 | if (!isatty(out)) | |
1170 | set_nonblock(out); | |
1171 | if (!isatty(err)) | |
1172 | set_nonblock(err); | |
1173 | ||
bcbf86ec | 1174 | window = CHAN_SES_WINDOW_DEFAULT; |
1175 | packetmax = CHAN_SES_PACKET_DEFAULT; | |
ea9700ba | 1176 | if (tty_flag) { |
1177 | window >>= 1; | |
1178 | packetmax >>= 1; | |
8ce64345 | 1179 | } |
719fc62f | 1180 | c = channel_new( |
8ce64345 | 1181 | "session", SSH_CHANNEL_OPENING, in, out, err, |
bcbf86ec | 1182 | window, packetmax, CHAN_EXTENDED_WRITE, |
0d942eff | 1183 | "client-session", /*nonblock*/0); |
8ce64345 | 1184 | |
bcdb96c2 | 1185 | debug3("ssh_session2_open: channel_new: %d", c->self); |
eb0dd41f | 1186 | |
36e1f6a1 | 1187 | channel_send_open(c->self); |
bcdb96c2 | 1188 | if (!no_shell_flag) |
3593bdc0 | 1189 | channel_register_open_confirm(c->self, |
1190 | ssh_session2_setup, NULL); | |
5260325f | 1191 | |
719fc62f | 1192 | return c->self; |
eb0dd41f | 1193 | } |
1194 | ||
396c147e | 1195 | static int |
eb0dd41f | 1196 | ssh_session2(void) |
1197 | { | |
bcdb96c2 | 1198 | int id = -1; |
eb0dd41f | 1199 | |
1200 | /* XXX should be pre-session */ | |
1201 | ssh_init_forwarding(); | |
1202 | ||
bcdb96c2 | 1203 | if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN)) |
1204 | id = ssh_session2_open(); | |
eb0dd41f | 1205 | |
3f0444ca | 1206 | /* If we don't expect to open a new session, then disallow it */ |
72bd2fca | 1207 | if (options.control_master == SSHCTL_MASTER_NO && |
1208 | (datafellows & SSH_NEW_OPENSSH)) { | |
3f0444ca | 1209 | debug("Requesting no-more-sessions@openssh.com"); |
1210 | packet_start(SSH2_MSG_GLOBAL_REQUEST); | |
1211 | packet_put_cstring("no-more-sessions@openssh.com"); | |
1212 | packet_put_char(0); | |
1213 | packet_send(); | |
1214 | } | |
1215 | ||
d20f3c9e | 1216 | /* Execute a local command */ |
1217 | if (options.local_command != NULL && | |
1218 | options.permit_local_command) | |
1219 | ssh_local_cmd(options.local_command); | |
1220 | ||
79303c5a | 1221 | /* Start listening for multiplex clients */ |
3bcced4c | 1222 | muxserver_listen(); |
79303c5a | 1223 | |
eb0dd41f | 1224 | /* If requested, let ssh continue in the background. */ |
6c777090 | 1225 | if (fork_after_authentication_flag) { |
1226 | fork_after_authentication_flag = 0; | |
eb0dd41f | 1227 | if (daemon(1, 1) < 0) |
1228 | fatal("daemon() failed: %.200s", strerror(errno)); | |
6c777090 | 1229 | } |
eb0dd41f | 1230 | |
4bf9c10e | 1231 | return client_loop(tty_flag, tty_flag ? |
1232 | options.escape_char : SSH_ESCAPECHAR_NONE, id); | |
8efc0c15 | 1233 | } |
fa08c86b | 1234 | |
396c147e | 1235 | static void |
fee56204 | 1236 | load_public_identity_files(void) |
1237 | { | |
8cffe22a | 1238 | char *filename, *cp, thishost[NI_MAXHOST]; |
a7082e17 | 1239 | char *pwdir = NULL, *pwname = NULL; |
2e23cde0 | 1240 | int i = 0; |
0659cace | 1241 | Key *public; |
8cffe22a | 1242 | struct passwd *pw; |
383546c4 | 1243 | #ifdef SMARTCARD |
0659cace | 1244 | Key **keys; |
1245 | ||
9ff6f66f | 1246 | if (options.smartcard_device != NULL && |
0659cace | 1247 | options.num_identity_files < SSH_MAX_IDENTITY_FILES && |
d4f40d92 | 1248 | (keys = sc_get_keys(options.smartcard_device, NULL)) != NULL) { |
0659cace | 1249 | int count = 0; |
1250 | for (i = 0; keys[i] != NULL; i++) { | |
1251 | count++; | |
e8097dc9 | 1252 | memmove(&options.identity_files[1], |
1253 | &options.identity_files[0], | |
0659cace | 1254 | sizeof(char *) * (SSH_MAX_IDENTITY_FILES - 1)); |
e8097dc9 | 1255 | memmove(&options.identity_keys[1], |
1256 | &options.identity_keys[0], | |
0659cace | 1257 | sizeof(Key *) * (SSH_MAX_IDENTITY_FILES - 1)); |
1258 | options.num_identity_files++; | |
1259 | options.identity_keys[0] = keys[i]; | |
244e796f | 1260 | options.identity_files[0] = sc_get_key_label(keys[i]); |
0659cace | 1261 | } |
1c2deed1 | 1262 | if (options.num_identity_files > SSH_MAX_IDENTITY_FILES) |
1263 | options.num_identity_files = SSH_MAX_IDENTITY_FILES; | |
0659cace | 1264 | i = count; |
1265 | xfree(keys); | |
383546c4 | 1266 | } |
3e984472 | 1267 | #endif /* SMARTCARD */ |
8cffe22a | 1268 | if ((pw = getpwuid(original_real_uid)) == NULL) |
1269 | fatal("load_public_identity_files: getpwuid failed"); | |
42f4b33f | 1270 | pwname = xstrdup(pw->pw_name); |
1271 | pwdir = xstrdup(pw->pw_dir); | |
8cffe22a | 1272 | if (gethostname(thishost, sizeof(thishost)) == -1) |
1273 | fatal("load_public_identity_files: gethostname: %s", | |
1274 | strerror(errno)); | |
2e23cde0 | 1275 | for (; i < options.num_identity_files; i++) { |
8cffe22a | 1276 | cp = tilde_expand_filename(options.identity_files[i], |
2e23cde0 | 1277 | original_real_uid); |
a7082e17 | 1278 | filename = percent_expand(cp, "d", pwdir, |
1279 | "u", pwname, "l", thishost, "h", host, | |
8cffe22a | 1280 | "r", options.user, (char *)NULL); |
1281 | xfree(cp); | |
2e23cde0 | 1282 | public = key_load_public(filename, NULL); |
1283 | debug("identity file %s type %d", filename, | |
1284 | public ? public->type : -1); | |
1285 | xfree(options.identity_files[i]); | |
1286 | options.identity_files[i] = filename; | |
1287 | options.identity_keys[i] = public; | |
1288 | } | |
a7082e17 | 1289 | bzero(pwname, strlen(pwname)); |
42f4b33f | 1290 | xfree(pwname); |
a7082e17 | 1291 | bzero(pwdir, strlen(pwdir)); |
42f4b33f | 1292 | xfree(pwdir); |
fee56204 | 1293 | } |