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3c0ef626 | 1 | /* |
2 | * Author: Tatu Ylonen <ylo@cs.hut.fi> | |
3 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
4 | * All rights reserved | |
5 | * Ssh client program. This program can be used to log into a remote machine. | |
6 | * The software supports strong authentication, encryption, and forwarding | |
7 | * of X11, TCP/IP, and authentication connections. | |
8 | * | |
9 | * As far as I am concerned, the code I have written for this software | |
10 | * can be used freely for any purpose. Any derived versions of this | |
11 | * software must be clearly marked as such, and if the derived work is | |
12 | * incompatible with the protocol description in the RFC file, it must be | |
13 | * called by a name other than "ssh" or "Secure Shell". | |
14 | * | |
15 | * Copyright (c) 1999 Niels Provos. All rights reserved. | |
c6046bb0 | 16 | * Copyright (c) 2000, 2001, 2002 Markus Friedl. All rights reserved. |
3c0ef626 | 17 | * |
18 | * Modified to work with SSL by Niels Provos <provos@citi.umich.edu> | |
19 | * in Canada (German citizen). | |
20 | * | |
21 | * Redistribution and use in source and binary forms, with or without | |
22 | * modification, are permitted provided that the following conditions | |
23 | * are met: | |
24 | * 1. Redistributions of source code must retain the above copyright | |
25 | * notice, this list of conditions and the following disclaimer. | |
26 | * 2. Redistributions in binary form must reproduce the above copyright | |
27 | * notice, this list of conditions and the following disclaimer in the | |
28 | * documentation and/or other materials provided with the distribution. | |
29 | * | |
30 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
31 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
32 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
33 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
34 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
35 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
36 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
37 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
38 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
39 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
40 | */ | |
41 | ||
42 | #include "includes.h" | |
d03f4262 | 43 | RCSID("$OpenBSD: ssh.c,v 1.186 2002/09/19 01:58:18 djm Exp $"); |
3c0ef626 | 44 | |
45 | #include <openssl/evp.h> | |
46 | #include <openssl/err.h> | |
47 | ||
48 | #include "ssh.h" | |
49 | #include "ssh1.h" | |
50 | #include "ssh2.h" | |
51 | #include "compat.h" | |
52 | #include "cipher.h" | |
53 | #include "xmalloc.h" | |
54 | #include "packet.h" | |
55 | #include "buffer.h" | |
3c0ef626 | 56 | #include "channels.h" |
57 | #include "key.h" | |
58 | #include "authfd.h" | |
59 | #include "authfile.h" | |
60 | #include "pathnames.h" | |
61 | #include "clientloop.h" | |
62 | #include "log.h" | |
63 | #include "readconf.h" | |
64 | #include "sshconnect.h" | |
65 | #include "tildexpand.h" | |
66 | #include "dispatch.h" | |
67 | #include "misc.h" | |
68 | #include "kex.h" | |
69 | #include "mac.h" | |
70 | #include "sshtty.h" | |
71 | ||
72 | #ifdef SMARTCARD | |
3c0ef626 | 73 | #include "scard.h" |
74 | #endif | |
75 | ||
76 | #ifdef HAVE___PROGNAME | |
77 | extern char *__progname; | |
78 | #else | |
79 | char *__progname; | |
80 | #endif | |
81 | ||
82 | /* Flag indicating whether IPv4 or IPv6. This can be set on the command line. | |
83 | Default value is AF_UNSPEC means both IPv4 and IPv6. */ | |
84 | #ifdef IPV4_DEFAULT | |
85 | int IPv4or6 = AF_INET; | |
86 | #else | |
87 | int IPv4or6 = AF_UNSPEC; | |
88 | #endif | |
89 | ||
90 | /* Flag indicating whether debug mode is on. This can be set on the command line. */ | |
91 | int debug_flag = 0; | |
92 | ||
93 | /* Flag indicating whether a tty should be allocated */ | |
94 | int tty_flag = 0; | |
95 | int no_tty_flag = 0; | |
96 | int force_tty_flag = 0; | |
97 | ||
98 | /* don't exec a shell */ | |
99 | int no_shell_flag = 0; | |
100 | ||
101 | /* | |
102 | * Flag indicating that nothing should be read from stdin. This can be set | |
103 | * on the command line. | |
104 | */ | |
105 | int stdin_null_flag = 0; | |
106 | ||
107 | /* | |
108 | * Flag indicating that ssh should fork after authentication. This is useful | |
44a053a3 | 109 | * so that the passphrase can be entered manually, and then ssh goes to the |
3c0ef626 | 110 | * background. |
111 | */ | |
112 | int fork_after_authentication_flag = 0; | |
113 | ||
114 | /* | |
115 | * General data structure for command line options and options configurable | |
116 | * in configuration files. See readconf.h. | |
117 | */ | |
118 | Options options; | |
119 | ||
120 | /* optional user configfile */ | |
121 | char *config = NULL; | |
122 | ||
123 | /* | |
124 | * Name of the host we are connecting to. This is the name given on the | |
125 | * command line, or the HostName specified for the user-supplied name in a | |
126 | * configuration file. | |
127 | */ | |
128 | char *host; | |
129 | ||
130 | /* socket address the host resolves to */ | |
131 | struct sockaddr_storage hostaddr; | |
132 | ||
133 | /* Private host keys. */ | |
44a053a3 | 134 | Sensitive sensitive_data; |
3c0ef626 | 135 | |
136 | /* Original real UID. */ | |
137 | uid_t original_real_uid; | |
44a053a3 | 138 | uid_t original_effective_uid; |
3c0ef626 | 139 | |
140 | /* command to be executed */ | |
141 | Buffer command; | |
142 | ||
143 | /* Should we execute a command or invoke a subsystem? */ | |
144 | int subsystem_flag = 0; | |
145 | ||
c6046bb0 | 146 | /* # of replies received for global requests */ |
147 | static int client_global_request_id = 0; | |
148 | ||
d03f4262 | 149 | /* pid of proxycommand child process */ |
150 | pid_t proxy_command_pid = 0; | |
151 | ||
3c0ef626 | 152 | /* Prints a help message to the user. This function never returns. */ |
153 | ||
154 | static void | |
155 | usage(void) | |
156 | { | |
157 | fprintf(stderr, "Usage: %s [options] host [command]\n", __progname); | |
158 | fprintf(stderr, "Options:\n"); | |
159 | fprintf(stderr, " -l user Log in using this user name.\n"); | |
160 | fprintf(stderr, " -n Redirect input from " _PATH_DEVNULL ".\n"); | |
161 | fprintf(stderr, " -F config Config file (default: ~/%s).\n", | |
162 | _PATH_SSH_USER_CONFFILE); | |
163 | fprintf(stderr, " -A Enable authentication agent forwarding.\n"); | |
164 | fprintf(stderr, " -a Disable authentication agent forwarding (default).\n"); | |
165 | #ifdef AFS | |
166 | fprintf(stderr, " -k Disable Kerberos ticket and AFS token forwarding.\n"); | |
167 | #endif /* AFS */ | |
168 | fprintf(stderr, " -X Enable X11 connection forwarding.\n"); | |
169 | fprintf(stderr, " -x Disable X11 connection forwarding (default).\n"); | |
170 | fprintf(stderr, " -i file Identity for public key authentication " | |
171 | "(default: ~/.ssh/identity)\n"); | |
172 | #ifdef SMARTCARD | |
173 | fprintf(stderr, " -I reader Set smartcard reader.\n"); | |
174 | #endif | |
175 | fprintf(stderr, " -t Tty; allocate a tty even if command is given.\n"); | |
176 | fprintf(stderr, " -T Do not allocate a tty.\n"); | |
177 | fprintf(stderr, " -v Verbose; display verbose debugging messages.\n"); | |
178 | fprintf(stderr, " Multiple -v increases verbosity.\n"); | |
179 | fprintf(stderr, " -V Display version number only.\n"); | |
3c0ef626 | 180 | fprintf(stderr, " -q Quiet; don't display any warning messages.\n"); |
181 | fprintf(stderr, " -f Fork into background after authentication.\n"); | |
182 | fprintf(stderr, " -e char Set escape character; ``none'' = disable (default: ~).\n"); | |
183 | ||
184 | fprintf(stderr, " -c cipher Select encryption algorithm\n"); | |
185 | fprintf(stderr, " -m macs Specify MAC algorithms for protocol version 2.\n"); | |
186 | fprintf(stderr, " -p port Connect to this port. Server must be on the same port.\n"); | |
187 | fprintf(stderr, " -L listen-port:host:port Forward local port to remote address\n"); | |
188 | fprintf(stderr, " -R listen-port:host:port Forward remote port to local address\n"); | |
189 | fprintf(stderr, " These cause %s to listen for connections on a port, and\n", __progname); | |
190 | fprintf(stderr, " forward them to the other side by connecting to host:port.\n"); | |
191 | fprintf(stderr, " -D port Enable dynamic application-level port forwarding.\n"); | |
192 | fprintf(stderr, " -C Enable compression.\n"); | |
193 | fprintf(stderr, " -N Do not execute a shell or command.\n"); | |
194 | fprintf(stderr, " -g Allow remote hosts to connect to forwarded ports.\n"); | |
195 | fprintf(stderr, " -1 Force protocol version 1.\n"); | |
196 | fprintf(stderr, " -2 Force protocol version 2.\n"); | |
197 | fprintf(stderr, " -4 Use IPv4 only.\n"); | |
198 | fprintf(stderr, " -6 Use IPv6 only.\n"); | |
199 | fprintf(stderr, " -o 'option' Process the option as if it was read from a configuration file.\n"); | |
200 | fprintf(stderr, " -s Invoke command (mandatory) as SSH2 subsystem.\n"); | |
201 | fprintf(stderr, " -b addr Local IP address.\n"); | |
202 | exit(1); | |
203 | } | |
204 | ||
3c0ef626 | 205 | static int ssh_session(void); |
206 | static int ssh_session2(void); | |
207 | static void load_public_identity_files(void); | |
208 | ||
209 | /* | |
210 | * Main program for the ssh client. | |
211 | */ | |
212 | int | |
213 | main(int ac, char **av) | |
214 | { | |
44a053a3 | 215 | int i, opt, exit_status; |
3c0ef626 | 216 | u_short fwd_port, fwd_host_port; |
217 | char sfwd_port[6], sfwd_host_port[6]; | |
218 | char *p, *cp, buf[256]; | |
219 | struct stat st; | |
220 | struct passwd *pw; | |
221 | int dummy; | |
3c0ef626 | 222 | extern int optind, optreset; |
223 | extern char *optarg; | |
224 | ||
225 | __progname = get_progname(av[0]); | |
226 | init_rng(); | |
227 | ||
228 | /* | |
229 | * Save the original real uid. It will be needed later (uid-swapping | |
230 | * may clobber the real uid). | |
231 | */ | |
232 | original_real_uid = getuid(); | |
233 | original_effective_uid = geteuid(); | |
d03f4262 | 234 | |
235 | /* | |
236 | * Use uid-swapping to give up root privileges for the duration of | |
237 | * option processing. We will re-instantiate the rights when we are | |
238 | * ready to create the privileged port, and will permanently drop | |
239 | * them when the port has been created (actually, when the connection | |
240 | * has been made, as we may need to create the port several times). | |
241 | */ | |
242 | PRIV_END; | |
3c0ef626 | 243 | |
244 | #ifdef HAVE_SETRLIMIT | |
245 | /* If we are installed setuid root be careful to not drop core. */ | |
246 | if (original_real_uid != original_effective_uid) { | |
247 | struct rlimit rlim; | |
248 | rlim.rlim_cur = rlim.rlim_max = 0; | |
249 | if (setrlimit(RLIMIT_CORE, &rlim) < 0) | |
250 | fatal("setrlimit failed: %.100s", strerror(errno)); | |
251 | } | |
252 | #endif | |
253 | /* Get user data. */ | |
254 | pw = getpwuid(original_real_uid); | |
255 | if (!pw) { | |
256 | log("You don't exist, go away!"); | |
257 | exit(1); | |
258 | } | |
259 | /* Take a copy of the returned structure. */ | |
260 | pw = pwcopy(pw); | |
261 | ||
3c0ef626 | 262 | /* |
263 | * Set our umask to something reasonable, as some files are created | |
264 | * with the default umask. This will make them world-readable but | |
265 | * writable only by the owner, which is ok for all files for which we | |
266 | * don't set the modes explicitly. | |
267 | */ | |
268 | umask(022); | |
269 | ||
270 | /* Initialize option structure to indicate that no values have been set. */ | |
271 | initialize_options(&options); | |
272 | ||
273 | /* Parse command-line arguments. */ | |
274 | host = NULL; | |
275 | ||
276 | again: | |
277 | while ((opt = getopt(ac, av, | |
278 | "1246ab:c:e:fgi:kl:m:no:p:qstvxACD:F:I:L:NPR:TVX")) != -1) { | |
279 | switch (opt) { | |
280 | case '1': | |
281 | options.protocol = SSH_PROTO_1; | |
282 | break; | |
283 | case '2': | |
284 | options.protocol = SSH_PROTO_2; | |
285 | break; | |
286 | case '4': | |
287 | IPv4or6 = AF_INET; | |
288 | break; | |
289 | case '6': | |
290 | IPv4or6 = AF_INET6; | |
291 | break; | |
292 | case 'n': | |
293 | stdin_null_flag = 1; | |
294 | break; | |
295 | case 'f': | |
296 | fork_after_authentication_flag = 1; | |
297 | stdin_null_flag = 1; | |
298 | break; | |
299 | case 'x': | |
300 | options.forward_x11 = 0; | |
301 | break; | |
302 | case 'X': | |
303 | options.forward_x11 = 1; | |
304 | break; | |
305 | case 'g': | |
306 | options.gateway_ports = 1; | |
307 | break; | |
d03f4262 | 308 | case 'P': /* deprecated */ |
3c0ef626 | 309 | options.use_privileged_port = 0; |
310 | break; | |
311 | case 'a': | |
312 | options.forward_agent = 0; | |
313 | break; | |
314 | case 'A': | |
315 | options.forward_agent = 1; | |
316 | break; | |
317 | #ifdef AFS | |
318 | case 'k': | |
319 | options.kerberos_tgt_passing = 0; | |
320 | options.afs_token_passing = 0; | |
321 | break; | |
322 | #endif | |
323 | case 'i': | |
324 | if (stat(optarg, &st) < 0) { | |
325 | fprintf(stderr, "Warning: Identity file %s " | |
326 | "does not exist.\n", optarg); | |
327 | break; | |
328 | } | |
329 | if (options.num_identity_files >= | |
330 | SSH_MAX_IDENTITY_FILES) | |
331 | fatal("Too many identity files specified " | |
332 | "(max %d)", SSH_MAX_IDENTITY_FILES); | |
333 | options.identity_files[options.num_identity_files++] = | |
334 | xstrdup(optarg); | |
335 | break; | |
336 | case 'I': | |
337 | #ifdef SMARTCARD | |
338 | options.smartcard_device = xstrdup(optarg); | |
339 | #else | |
340 | fprintf(stderr, "no support for smartcards.\n"); | |
341 | #endif | |
342 | break; | |
343 | case 't': | |
344 | if (tty_flag) | |
345 | force_tty_flag = 1; | |
346 | tty_flag = 1; | |
347 | break; | |
348 | case 'v': | |
349 | if (0 == debug_flag) { | |
350 | debug_flag = 1; | |
351 | options.log_level = SYSLOG_LEVEL_DEBUG1; | |
352 | } else if (options.log_level < SYSLOG_LEVEL_DEBUG3) { | |
353 | options.log_level++; | |
354 | break; | |
355 | } else | |
356 | fatal("Too high debugging level."); | |
357 | /* fallthrough */ | |
358 | case 'V': | |
359 | fprintf(stderr, | |
360 | "%s, SSH protocols %d.%d/%d.%d, OpenSSL 0x%8.8lx\n", | |
361 | SSH_VERSION, | |
362 | PROTOCOL_MAJOR_1, PROTOCOL_MINOR_1, | |
363 | PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2, | |
364 | SSLeay()); | |
365 | if (opt == 'V') | |
366 | exit(0); | |
367 | break; | |
368 | case 'q': | |
369 | options.log_level = SYSLOG_LEVEL_QUIET; | |
370 | break; | |
371 | case 'e': | |
372 | if (optarg[0] == '^' && optarg[2] == 0 && | |
373 | (u_char) optarg[1] >= 64 && | |
374 | (u_char) optarg[1] < 128) | |
375 | options.escape_char = (u_char) optarg[1] & 31; | |
376 | else if (strlen(optarg) == 1) | |
377 | options.escape_char = (u_char) optarg[0]; | |
378 | else if (strcmp(optarg, "none") == 0) | |
379 | options.escape_char = SSH_ESCAPECHAR_NONE; | |
380 | else { | |
381 | fprintf(stderr, "Bad escape character '%s'.\n", | |
382 | optarg); | |
383 | exit(1); | |
384 | } | |
385 | break; | |
386 | case 'c': | |
387 | if (ciphers_valid(optarg)) { | |
388 | /* SSH2 only */ | |
389 | options.ciphers = xstrdup(optarg); | |
390 | options.cipher = SSH_CIPHER_ILLEGAL; | |
391 | } else { | |
392 | /* SSH1 only */ | |
393 | options.cipher = cipher_number(optarg); | |
394 | if (options.cipher == -1) { | |
395 | fprintf(stderr, | |
396 | "Unknown cipher type '%s'\n", | |
397 | optarg); | |
398 | exit(1); | |
399 | } | |
400 | if (options.cipher == SSH_CIPHER_3DES) | |
401 | options.ciphers = "3des-cbc"; | |
402 | else if (options.cipher == SSH_CIPHER_BLOWFISH) | |
403 | options.ciphers = "blowfish-cbc"; | |
404 | else | |
405 | options.ciphers = (char *)-1; | |
406 | } | |
407 | break; | |
408 | case 'm': | |
409 | if (mac_valid(optarg)) | |
410 | options.macs = xstrdup(optarg); | |
411 | else { | |
412 | fprintf(stderr, "Unknown mac type '%s'\n", | |
413 | optarg); | |
414 | exit(1); | |
415 | } | |
416 | break; | |
417 | case 'p': | |
418 | options.port = a2port(optarg); | |
419 | if (options.port == 0) { | |
420 | fprintf(stderr, "Bad port '%s'\n", optarg); | |
421 | exit(1); | |
422 | } | |
423 | break; | |
424 | case 'l': | |
425 | options.user = optarg; | |
426 | break; | |
427 | ||
428 | case 'L': | |
429 | case 'R': | |
430 | if (sscanf(optarg, "%5[0-9]:%255[^:]:%5[0-9]", | |
431 | sfwd_port, buf, sfwd_host_port) != 3 && | |
432 | sscanf(optarg, "%5[0-9]/%255[^/]/%5[0-9]", | |
433 | sfwd_port, buf, sfwd_host_port) != 3) { | |
434 | fprintf(stderr, | |
435 | "Bad forwarding specification '%s'\n", | |
436 | optarg); | |
437 | usage(); | |
438 | /* NOTREACHED */ | |
439 | } | |
440 | if ((fwd_port = a2port(sfwd_port)) == 0 || | |
c6046bb0 | 441 | (fwd_host_port = a2port(sfwd_host_port)) == 0) { |
3c0ef626 | 442 | fprintf(stderr, |
443 | "Bad forwarding port(s) '%s'\n", optarg); | |
444 | exit(1); | |
445 | } | |
446 | if (opt == 'L') | |
447 | add_local_forward(&options, fwd_port, buf, | |
448 | fwd_host_port); | |
449 | else if (opt == 'R') | |
450 | add_remote_forward(&options, fwd_port, buf, | |
c6046bb0 | 451 | fwd_host_port); |
3c0ef626 | 452 | break; |
453 | ||
454 | case 'D': | |
455 | fwd_port = a2port(optarg); | |
456 | if (fwd_port == 0) { | |
457 | fprintf(stderr, "Bad dynamic port '%s'\n", | |
458 | optarg); | |
459 | exit(1); | |
460 | } | |
461 | add_local_forward(&options, fwd_port, "socks4", 0); | |
462 | break; | |
463 | ||
464 | case 'C': | |
465 | options.compression = 1; | |
466 | break; | |
467 | case 'N': | |
468 | no_shell_flag = 1; | |
469 | no_tty_flag = 1; | |
470 | break; | |
471 | case 'T': | |
472 | no_tty_flag = 1; | |
473 | break; | |
474 | case 'o': | |
475 | dummy = 1; | |
476 | if (process_config_line(&options, host ? host : "", | |
477 | optarg, "command-line", 0, &dummy) != 0) | |
478 | exit(1); | |
479 | break; | |
480 | case 's': | |
481 | subsystem_flag = 1; | |
482 | break; | |
483 | case 'b': | |
484 | options.bind_address = optarg; | |
485 | break; | |
486 | case 'F': | |
487 | config = optarg; | |
488 | break; | |
489 | default: | |
490 | usage(); | |
491 | } | |
492 | } | |
493 | ||
494 | ac -= optind; | |
495 | av += optind; | |
496 | ||
497 | if (ac > 0 && !host && **av != '-') { | |
498 | if (strchr(*av, '@')) { | |
499 | p = xstrdup(*av); | |
500 | cp = strchr(p, '@'); | |
501 | if (cp == NULL || cp == p) | |
502 | usage(); | |
503 | options.user = p; | |
504 | *cp = '\0'; | |
505 | host = ++cp; | |
506 | } else | |
507 | host = *av; | |
508 | ac--, av++; | |
509 | if (ac > 0) { | |
510 | optind = 0; | |
511 | optreset = 1; | |
512 | goto again; | |
513 | } | |
514 | } | |
515 | ||
516 | /* Check that we got a host name. */ | |
517 | if (!host) | |
518 | usage(); | |
519 | ||
520 | SSLeay_add_all_algorithms(); | |
521 | ERR_load_crypto_strings(); | |
522 | channel_set_af(IPv4or6); | |
523 | ||
524 | /* Initialize the command to execute on remote host. */ | |
525 | buffer_init(&command); | |
526 | ||
527 | /* | |
528 | * Save the command to execute on the remote host in a buffer. There | |
529 | * is no limit on the length of the command, except by the maximum | |
530 | * packet size. Also sets the tty flag if there is no command. | |
531 | */ | |
532 | if (!ac) { | |
533 | /* No command specified - execute shell on a tty. */ | |
534 | tty_flag = 1; | |
535 | if (subsystem_flag) { | |
536 | fprintf(stderr, | |
537 | "You must specify a subsystem to invoke.\n"); | |
538 | usage(); | |
539 | } | |
540 | } else { | |
541 | /* A command has been specified. Store it into the buffer. */ | |
542 | for (i = 0; i < ac; i++) { | |
543 | if (i) | |
544 | buffer_append(&command, " ", 1); | |
545 | buffer_append(&command, av[i], strlen(av[i])); | |
546 | } | |
547 | } | |
548 | ||
549 | /* Cannot fork to background if no command. */ | |
550 | if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag) | |
551 | fatal("Cannot fork into background without a command to execute."); | |
552 | ||
553 | /* Allocate a tty by default if no command specified. */ | |
554 | if (buffer_len(&command) == 0) | |
555 | tty_flag = 1; | |
556 | ||
d03f4262 | 557 | /* Force no tty */ |
3c0ef626 | 558 | if (no_tty_flag) |
559 | tty_flag = 0; | |
560 | /* Do not allocate a tty if stdin is not a tty. */ | |
561 | if (!isatty(fileno(stdin)) && !force_tty_flag) { | |
562 | if (tty_flag) | |
563 | log("Pseudo-terminal will not be allocated because stdin is not a terminal."); | |
564 | tty_flag = 0; | |
565 | } | |
566 | ||
567 | /* | |
568 | * Initialize "log" output. Since we are the client all output | |
569 | * actually goes to stderr. | |
570 | */ | |
571 | log_init(av[0], options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level, | |
572 | SYSLOG_FACILITY_USER, 1); | |
573 | ||
574 | /* | |
575 | * Read per-user configuration file. Ignore the system wide config | |
576 | * file if the user specifies a config file on the command line. | |
577 | */ | |
578 | if (config != NULL) { | |
579 | if (!read_config_file(config, host, &options)) | |
580 | fatal("Can't open user config file %.100s: " | |
581 | "%.100s", config, strerror(errno)); | |
582 | } else { | |
c6046bb0 | 583 | /* |
584 | * Since the config file parsing code aborts if it sees | |
585 | * options it doesn't recognize, allow users to put | |
586 | * options specific to compile-time add-ons in alternate | |
587 | * config files so their primary config file will | |
588 | * interoperate SSH versions that don't support those | |
589 | * options. | |
590 | */ | |
591 | #ifdef GSSAPI | |
592 | snprintf(buf, sizeof buf, "%.100s/%.100s.gssapi", pw->pw_dir, | |
593 | _PATH_SSH_USER_CONFFILE); | |
594 | (void)read_config_file(buf, host, &options); | |
595 | #ifdef GSI | |
596 | snprintf(buf, sizeof buf, "%.100s/%.100s.gsi", pw->pw_dir, | |
597 | _PATH_SSH_USER_CONFFILE); | |
598 | (void)read_config_file(buf, host, &options); | |
599 | #endif | |
600 | #if defined(KRB4) || defined(KRB5) | |
601 | snprintf(buf, sizeof buf, "%.100s/%.100s.krb", pw->pw_dir, | |
602 | _PATH_SSH_USER_CONFFILE); | |
603 | (void)read_config_file(buf, host, &options); | |
604 | #endif | |
605 | #ifdef AFS | |
606 | snprintf(buf, sizeof buf, "%.100s/%.100s.afs", pw->pw_dir, | |
607 | _PATH_SSH_USER_CONFFILE); | |
608 | (void)read_config_file(buf, host, &options); | |
609 | #endif | |
610 | #endif | |
3c0ef626 | 611 | snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, |
612 | _PATH_SSH_USER_CONFFILE); | |
613 | (void)read_config_file(buf, host, &options); | |
614 | ||
615 | /* Read systemwide configuration file after use config. */ | |
616 | (void)read_config_file(_PATH_HOST_CONFIG_FILE, host, &options); | |
617 | } | |
618 | ||
619 | /* Fill configuration defaults. */ | |
620 | fill_default_options(&options); | |
621 | ||
622 | /* reinit */ | |
623 | log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 1); | |
624 | ||
625 | seed_rng(); | |
626 | ||
73a68d83 | 627 | if (options.user == NULL) { |
628 | options.user = xstrdup(pw->pw_name); | |
629 | options.implicit = 1; | |
630 | } | |
631 | else options.implicit = 0; | |
3c0ef626 | 632 | |
633 | if (options.hostname != NULL) | |
634 | host = options.hostname; | |
635 | ||
636 | /* Disable rhosts authentication if not running as root. */ | |
637 | #ifdef HAVE_CYGWIN | |
638 | /* Ignore uid if running under Windows */ | |
639 | if (!options.use_privileged_port) { | |
640 | #else | |
641 | if (original_effective_uid != 0 || !options.use_privileged_port) { | |
642 | #endif | |
643 | debug("Rhosts Authentication disabled, " | |
644 | "originating port will not be trusted."); | |
645 | options.rhosts_authentication = 0; | |
646 | } | |
3c0ef626 | 647 | /* Open a connection to the remote host. */ |
648 | ||
44a053a3 | 649 | if (ssh_connect(host, &hostaddr, options.port, IPv4or6, |
3c0ef626 | 650 | options.connection_attempts, |
44a053a3 | 651 | #ifdef HAVE_CYGWIN |
652 | options.use_privileged_port, | |
653 | #else | |
654 | original_effective_uid == 0 && options.use_privileged_port, | |
655 | #endif | |
656 | options.proxy_command) != 0) | |
657 | exit(1); | |
3c0ef626 | 658 | |
659 | /* | |
660 | * If we successfully made the connection, load the host private key | |
661 | * in case we will need it later for combined rsa-rhosts | |
662 | * authentication. This must be done before releasing extra | |
663 | * privileges, because the file is only readable by root. | |
44a053a3 | 664 | * If we cannot access the private keys, load the public keys |
665 | * instead and try to execute the ssh-keysign helper instead. | |
3c0ef626 | 666 | */ |
667 | sensitive_data.nkeys = 0; | |
668 | sensitive_data.keys = NULL; | |
44a053a3 | 669 | sensitive_data.external_keysign = 0; |
670 | if (options.rhosts_rsa_authentication || | |
671 | options.hostbased_authentication) { | |
3c0ef626 | 672 | sensitive_data.nkeys = 3; |
d03f4262 | 673 | sensitive_data.keys = xmalloc(sensitive_data.nkeys * |
674 | sizeof(Key)); | |
44a053a3 | 675 | |
676 | PRIV_START; | |
3c0ef626 | 677 | sensitive_data.keys[0] = key_load_private_type(KEY_RSA1, |
678 | _PATH_HOST_KEY_FILE, "", NULL); | |
679 | sensitive_data.keys[1] = key_load_private_type(KEY_DSA, | |
680 | _PATH_HOST_DSA_KEY_FILE, "", NULL); | |
681 | sensitive_data.keys[2] = key_load_private_type(KEY_RSA, | |
682 | _PATH_HOST_RSA_KEY_FILE, "", NULL); | |
44a053a3 | 683 | PRIV_END; |
684 | ||
d03f4262 | 685 | if (options.hostbased_authentication == 1 && |
686 | sensitive_data.keys[0] == NULL && | |
44a053a3 | 687 | sensitive_data.keys[1] == NULL && |
688 | sensitive_data.keys[2] == NULL) { | |
689 | sensitive_data.keys[1] = key_load_public( | |
690 | _PATH_HOST_DSA_KEY_FILE, NULL); | |
691 | sensitive_data.keys[2] = key_load_public( | |
692 | _PATH_HOST_RSA_KEY_FILE, NULL); | |
693 | sensitive_data.external_keysign = 1; | |
694 | } | |
3c0ef626 | 695 | } |
696 | /* | |
697 | * Get rid of any extra privileges that we may have. We will no | |
698 | * longer need them. Also, extra privileges could make it very hard | |
699 | * to read identity files and other non-world-readable files from the | |
700 | * user's home directory if it happens to be on a NFS volume where | |
701 | * root is mapped to nobody. | |
702 | */ | |
44a053a3 | 703 | seteuid(original_real_uid); |
704 | setuid(original_real_uid); | |
3c0ef626 | 705 | |
706 | /* | |
707 | * Now that we are back to our own permissions, create ~/.ssh | |
708 | * directory if it doesn\'t already exist. | |
709 | */ | |
710 | snprintf(buf, sizeof buf, "%.100s%s%.100s", pw->pw_dir, strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR); | |
711 | if (stat(buf, &st) < 0) | |
712 | if (mkdir(buf, 0700) < 0) | |
713 | error("Could not create directory '%.200s'.", buf); | |
714 | ||
3c0ef626 | 715 | /* load options.identity_files */ |
716 | load_public_identity_files(); | |
717 | ||
718 | /* Expand ~ in known host file names. */ | |
719 | /* XXX mem-leaks: */ | |
720 | options.system_hostfile = | |
721 | tilde_expand_filename(options.system_hostfile, original_real_uid); | |
722 | options.user_hostfile = | |
723 | tilde_expand_filename(options.user_hostfile, original_real_uid); | |
724 | options.system_hostfile2 = | |
725 | tilde_expand_filename(options.system_hostfile2, original_real_uid); | |
726 | options.user_hostfile2 = | |
727 | tilde_expand_filename(options.user_hostfile2, original_real_uid); | |
728 | ||
729 | signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */ | |
730 | ||
731 | /* Log into the remote system. This never returns if the login fails. */ | |
44a053a3 | 732 | ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr, pw); |
3c0ef626 | 733 | |
734 | /* We no longer need the private host keys. Clear them now. */ | |
735 | if (sensitive_data.nkeys != 0) { | |
736 | for (i = 0; i < sensitive_data.nkeys; i++) { | |
737 | if (sensitive_data.keys[i] != NULL) { | |
738 | /* Destroys contents safely */ | |
739 | debug3("clear hostkey %d", i); | |
740 | key_free(sensitive_data.keys[i]); | |
741 | sensitive_data.keys[i] = NULL; | |
742 | } | |
743 | } | |
744 | xfree(sensitive_data.keys); | |
745 | } | |
746 | for (i = 0; i < options.num_identity_files; i++) { | |
747 | if (options.identity_files[i]) { | |
748 | xfree(options.identity_files[i]); | |
749 | options.identity_files[i] = NULL; | |
750 | } | |
751 | if (options.identity_keys[i]) { | |
752 | key_free(options.identity_keys[i]); | |
753 | options.identity_keys[i] = NULL; | |
754 | } | |
755 | } | |
756 | ||
757 | exit_status = compat20 ? ssh_session2() : ssh_session(); | |
758 | packet_close(); | |
d03f4262 | 759 | |
760 | /* | |
761 | * Send SIGHUP to proxy command if used. We don't wait() in | |
762 | * case it hangs and instead rely on init to reap the child | |
763 | */ | |
764 | if (proxy_command_pid > 1) | |
765 | kill(proxy_command_pid, SIGHUP); | |
766 | ||
3c0ef626 | 767 | return exit_status; |
768 | } | |
769 | ||
770 | static void | |
c6046bb0 | 771 | x11_get_proto(char **_proto, char **_data) |
3c0ef626 | 772 | { |
773 | char line[512]; | |
c6046bb0 | 774 | static char proto[512], data[512]; |
3c0ef626 | 775 | FILE *f; |
776 | int got_data = 0, i; | |
c6046bb0 | 777 | char *display; |
d03f4262 | 778 | struct stat st; |
3c0ef626 | 779 | |
c6046bb0 | 780 | *_proto = proto; |
781 | *_data = data; | |
782 | proto[0] = data[0] = '\0'; | |
d03f4262 | 783 | if (!options.xauth_location || |
784 | (stat(options.xauth_location, &st) == -1)) { | |
785 | debug("No xauth program."); | |
786 | } else { | |
787 | if ((display = getenv("DISPLAY")) == NULL) { | |
788 | debug("x11_get_proto: DISPLAY not set"); | |
789 | return; | |
790 | } | |
3c0ef626 | 791 | /* Try to get Xauthority information for the display. */ |
c6046bb0 | 792 | if (strncmp(display, "localhost:", 10) == 0) |
793 | /* | |
794 | * Handle FamilyLocal case where $DISPLAY does | |
795 | * not match an authorization entry. For this we | |
796 | * just try "xauth list unix:displaynum.screennum". | |
797 | * XXX: "localhost" match to determine FamilyLocal | |
798 | * is not perfect. | |
799 | */ | |
44a053a3 | 800 | snprintf(line, sizeof line, "%s list unix:%s 2>" |
c6046bb0 | 801 | _PATH_DEVNULL, options.xauth_location, display+10); |
802 | else | |
44a053a3 | 803 | snprintf(line, sizeof line, "%s list %.200s 2>" |
c6046bb0 | 804 | _PATH_DEVNULL, options.xauth_location, display); |
d03f4262 | 805 | debug2("x11_get_proto: %s", line); |
3c0ef626 | 806 | f = popen(line, "r"); |
807 | if (f && fgets(line, sizeof(line), f) && | |
c6046bb0 | 808 | sscanf(line, "%*s %511s %511s", proto, data) == 2) |
3c0ef626 | 809 | got_data = 1; |
810 | if (f) | |
811 | pclose(f); | |
812 | } | |
813 | /* | |
814 | * If we didn't get authentication data, just make up some | |
815 | * data. The forwarding code will check the validity of the | |
816 | * response anyway, and substitute this data. The X11 | |
817 | * server, however, will ignore this fake data and use | |
818 | * whatever authentication mechanisms it was using otherwise | |
819 | * for the local connection. | |
820 | */ | |
821 | if (!got_data) { | |
822 | u_int32_t rand = 0; | |
823 | ||
d03f4262 | 824 | log("Warning: No xauth data; using fake authentication data for X11 forwarding."); |
c6046bb0 | 825 | strlcpy(proto, "MIT-MAGIC-COOKIE-1", sizeof proto); |
3c0ef626 | 826 | for (i = 0; i < 16; i++) { |
827 | if (i % 4 == 0) | |
828 | rand = arc4random(); | |
c6046bb0 | 829 | snprintf(data + 2 * i, sizeof data - 2 * i, "%02x", rand & 0xff); |
3c0ef626 | 830 | rand >>= 8; |
831 | } | |
832 | } | |
833 | } | |
834 | ||
835 | static void | |
836 | ssh_init_forwarding(void) | |
837 | { | |
838 | int success = 0; | |
839 | int i; | |
840 | ||
841 | /* Initiate local TCP/IP port forwardings. */ | |
842 | for (i = 0; i < options.num_local_forwards; i++) { | |
843 | debug("Connections to local port %d forwarded to remote address %.200s:%d", | |
844 | options.local_forwards[i].port, | |
845 | options.local_forwards[i].host, | |
846 | options.local_forwards[i].host_port); | |
c6046bb0 | 847 | success += channel_setup_local_fwd_listener( |
3c0ef626 | 848 | options.local_forwards[i].port, |
849 | options.local_forwards[i].host, | |
850 | options.local_forwards[i].host_port, | |
851 | options.gateway_ports); | |
852 | } | |
853 | if (i > 0 && success == 0) | |
854 | error("Could not request local forwarding."); | |
855 | ||
856 | /* Initiate remote TCP/IP port forwardings. */ | |
857 | for (i = 0; i < options.num_remote_forwards; i++) { | |
858 | debug("Connections to remote port %d forwarded to local address %.200s:%d", | |
859 | options.remote_forwards[i].port, | |
860 | options.remote_forwards[i].host, | |
861 | options.remote_forwards[i].host_port); | |
862 | channel_request_remote_forwarding( | |
863 | options.remote_forwards[i].port, | |
864 | options.remote_forwards[i].host, | |
865 | options.remote_forwards[i].host_port); | |
866 | } | |
867 | } | |
868 | ||
869 | static void | |
870 | check_agent_present(void) | |
871 | { | |
872 | if (options.forward_agent) { | |
873 | /* Clear agent forwarding if we don\'t have an agent. */ | |
d03f4262 | 874 | if (!ssh_agent_present()) |
3c0ef626 | 875 | options.forward_agent = 0; |
3c0ef626 | 876 | } |
877 | } | |
878 | ||
879 | static int | |
880 | ssh_session(void) | |
881 | { | |
882 | int type; | |
3c0ef626 | 883 | int interactive = 0; |
884 | int have_tty = 0; | |
885 | struct winsize ws; | |
886 | char *cp; | |
887 | ||
888 | /* Enable compression if requested. */ | |
889 | if (options.compression) { | |
890 | debug("Requesting compression at level %d.", options.compression_level); | |
891 | ||
892 | if (options.compression_level < 1 || options.compression_level > 9) | |
893 | fatal("Compression level must be from 1 (fast) to 9 (slow, best)."); | |
894 | ||
895 | /* Send the request. */ | |
896 | packet_start(SSH_CMSG_REQUEST_COMPRESSION); | |
897 | packet_put_int(options.compression_level); | |
898 | packet_send(); | |
899 | packet_write_wait(); | |
c6046bb0 | 900 | type = packet_read(); |
3c0ef626 | 901 | if (type == SSH_SMSG_SUCCESS) |
902 | packet_start_compression(options.compression_level); | |
903 | else if (type == SSH_SMSG_FAILURE) | |
904 | log("Warning: Remote host refused compression."); | |
905 | else | |
906 | packet_disconnect("Protocol error waiting for compression response."); | |
907 | } | |
908 | /* Allocate a pseudo tty if appropriate. */ | |
909 | if (tty_flag) { | |
910 | debug("Requesting pty."); | |
911 | ||
912 | /* Start the packet. */ | |
913 | packet_start(SSH_CMSG_REQUEST_PTY); | |
914 | ||
915 | /* Store TERM in the packet. There is no limit on the | |
916 | length of the string. */ | |
917 | cp = getenv("TERM"); | |
918 | if (!cp) | |
919 | cp = ""; | |
920 | packet_put_cstring(cp); | |
921 | ||
922 | /* Store window size in the packet. */ | |
923 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) | |
924 | memset(&ws, 0, sizeof(ws)); | |
925 | packet_put_int(ws.ws_row); | |
926 | packet_put_int(ws.ws_col); | |
927 | packet_put_int(ws.ws_xpixel); | |
928 | packet_put_int(ws.ws_ypixel); | |
929 | ||
930 | /* Store tty modes in the packet. */ | |
931 | tty_make_modes(fileno(stdin), NULL); | |
932 | ||
933 | /* Send the packet, and wait for it to leave. */ | |
934 | packet_send(); | |
935 | packet_write_wait(); | |
936 | ||
937 | /* Read response from the server. */ | |
c6046bb0 | 938 | type = packet_read(); |
3c0ef626 | 939 | if (type == SSH_SMSG_SUCCESS) { |
940 | interactive = 1; | |
941 | have_tty = 1; | |
942 | } else if (type == SSH_SMSG_FAILURE) | |
943 | log("Warning: Remote host failed or refused to allocate a pseudo tty."); | |
944 | else | |
945 | packet_disconnect("Protocol error waiting for pty request response."); | |
946 | } | |
947 | /* Request X11 forwarding if enabled and DISPLAY is set. */ | |
948 | if (options.forward_x11 && getenv("DISPLAY") != NULL) { | |
c6046bb0 | 949 | char *proto, *data; |
3c0ef626 | 950 | /* Get reasonable local authentication information. */ |
c6046bb0 | 951 | x11_get_proto(&proto, &data); |
3c0ef626 | 952 | /* Request forwarding with authentication spoofing. */ |
953 | debug("Requesting X11 forwarding with authentication spoofing."); | |
954 | x11_request_forwarding_with_spoofing(0, proto, data); | |
955 | ||
956 | /* Read response from the server. */ | |
c6046bb0 | 957 | type = packet_read(); |
3c0ef626 | 958 | if (type == SSH_SMSG_SUCCESS) { |
959 | interactive = 1; | |
960 | } else if (type == SSH_SMSG_FAILURE) { | |
961 | log("Warning: Remote host denied X11 forwarding."); | |
962 | } else { | |
963 | packet_disconnect("Protocol error waiting for X11 forwarding"); | |
964 | } | |
965 | } | |
966 | /* Tell the packet module whether this is an interactive session. */ | |
967 | packet_set_interactive(interactive); | |
968 | ||
969 | /* Request authentication agent forwarding if appropriate. */ | |
970 | check_agent_present(); | |
971 | ||
972 | if (options.forward_agent) { | |
973 | debug("Requesting authentication agent forwarding."); | |
974 | auth_request_forwarding(); | |
975 | ||
976 | /* Read response from the server. */ | |
c6046bb0 | 977 | type = packet_read(); |
978 | packet_check_eom(); | |
3c0ef626 | 979 | if (type != SSH_SMSG_SUCCESS) |
980 | log("Warning: Remote host denied authentication agent forwarding."); | |
981 | } | |
982 | ||
983 | /* Initiate port forwardings. */ | |
984 | ssh_init_forwarding(); | |
985 | ||
986 | /* If requested, let ssh continue in the background. */ | |
987 | if (fork_after_authentication_flag) | |
988 | if (daemon(1, 1) < 0) | |
989 | fatal("daemon() failed: %.200s", strerror(errno)); | |
990 | ||
991 | /* | |
992 | * If a command was specified on the command line, execute the | |
993 | * command now. Otherwise request the server to start a shell. | |
994 | */ | |
995 | if (buffer_len(&command) > 0) { | |
996 | int len = buffer_len(&command); | |
997 | if (len > 900) | |
998 | len = 900; | |
c6046bb0 | 999 | debug("Sending command: %.*s", len, (u_char *)buffer_ptr(&command)); |
3c0ef626 | 1000 | packet_start(SSH_CMSG_EXEC_CMD); |
1001 | packet_put_string(buffer_ptr(&command), buffer_len(&command)); | |
1002 | packet_send(); | |
1003 | packet_write_wait(); | |
1004 | } else { | |
1005 | debug("Requesting shell."); | |
1006 | packet_start(SSH_CMSG_EXEC_SHELL); | |
1007 | packet_send(); | |
1008 | packet_write_wait(); | |
1009 | } | |
1010 | ||
1011 | /* Enter the interactive session. */ | |
1012 | return client_loop(have_tty, tty_flag ? | |
1013 | options.escape_char : SSH_ESCAPECHAR_NONE, 0); | |
1014 | } | |
1015 | ||
1016 | static void | |
c6046bb0 | 1017 | client_subsystem_reply(int type, u_int32_t seq, void *ctxt) |
3c0ef626 | 1018 | { |
1019 | int id, len; | |
1020 | ||
1021 | id = packet_get_int(); | |
1022 | len = buffer_len(&command); | |
1023 | if (len > 900) | |
1024 | len = 900; | |
c6046bb0 | 1025 | packet_check_eom(); |
3c0ef626 | 1026 | if (type == SSH2_MSG_CHANNEL_FAILURE) |
1027 | fatal("Request for subsystem '%.*s' failed on channel %d", | |
c6046bb0 | 1028 | len, (u_char *)buffer_ptr(&command), id); |
1029 | } | |
1030 | ||
1031 | void | |
1032 | client_global_request_reply(int type, u_int32_t seq, void *ctxt) | |
1033 | { | |
1034 | int i; | |
1035 | ||
1036 | i = client_global_request_id++; | |
1037 | if (i >= options.num_remote_forwards) { | |
1038 | debug("client_global_request_reply: too many replies %d > %d", | |
1039 | i, options.num_remote_forwards); | |
1040 | return; | |
1041 | } | |
1042 | debug("remote forward %s for: listen %d, connect %s:%d", | |
1043 | type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure", | |
1044 | options.remote_forwards[i].port, | |
1045 | options.remote_forwards[i].host, | |
1046 | options.remote_forwards[i].host_port); | |
1047 | if (type == SSH2_MSG_REQUEST_FAILURE) | |
1048 | log("Warning: remote port forwarding failed for listen port %d", | |
1049 | options.remote_forwards[i].port); | |
3c0ef626 | 1050 | } |
1051 | ||
1052 | /* request pty/x11/agent/tcpfwd/shell for channel */ | |
1053 | static void | |
1054 | ssh_session2_setup(int id, void *arg) | |
1055 | { | |
1056 | int len; | |
1057 | int interactive = 0; | |
1058 | struct termios tio; | |
1059 | ||
1060 | debug("ssh_session2_setup: id %d", id); | |
1061 | ||
1062 | if (tty_flag) { | |
1063 | struct winsize ws; | |
1064 | char *cp; | |
1065 | cp = getenv("TERM"); | |
1066 | if (!cp) | |
1067 | cp = ""; | |
1068 | /* Store window size in the packet. */ | |
1069 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) | |
1070 | memset(&ws, 0, sizeof(ws)); | |
1071 | ||
1072 | channel_request_start(id, "pty-req", 0); | |
1073 | packet_put_cstring(cp); | |
1074 | packet_put_int(ws.ws_col); | |
1075 | packet_put_int(ws.ws_row); | |
1076 | packet_put_int(ws.ws_xpixel); | |
1077 | packet_put_int(ws.ws_ypixel); | |
1078 | tio = get_saved_tio(); | |
1079 | tty_make_modes(/*ignored*/ 0, &tio); | |
1080 | packet_send(); | |
1081 | interactive = 1; | |
1082 | /* XXX wait for reply */ | |
1083 | } | |
1084 | if (options.forward_x11 && | |
1085 | getenv("DISPLAY") != NULL) { | |
c6046bb0 | 1086 | char *proto, *data; |
3c0ef626 | 1087 | /* Get reasonable local authentication information. */ |
c6046bb0 | 1088 | x11_get_proto(&proto, &data); |
3c0ef626 | 1089 | /* Request forwarding with authentication spoofing. */ |
1090 | debug("Requesting X11 forwarding with authentication spoofing."); | |
1091 | x11_request_forwarding_with_spoofing(id, proto, data); | |
1092 | interactive = 1; | |
1093 | /* XXX wait for reply */ | |
1094 | } | |
1095 | ||
1096 | check_agent_present(); | |
1097 | if (options.forward_agent) { | |
1098 | debug("Requesting authentication agent forwarding."); | |
1099 | channel_request_start(id, "auth-agent-req@openssh.com", 0); | |
1100 | packet_send(); | |
1101 | } | |
1102 | ||
1103 | len = buffer_len(&command); | |
1104 | if (len > 0) { | |
1105 | if (len > 900) | |
1106 | len = 900; | |
1107 | if (subsystem_flag) { | |
c6046bb0 | 1108 | debug("Sending subsystem: %.*s", len, (u_char *)buffer_ptr(&command)); |
3c0ef626 | 1109 | channel_request_start(id, "subsystem", /*want reply*/ 1); |
1110 | /* register callback for reply */ | |
44a053a3 | 1111 | /* XXX we assume that client_loop has already been called */ |
3c0ef626 | 1112 | dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &client_subsystem_reply); |
1113 | dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &client_subsystem_reply); | |
1114 | } else { | |
c6046bb0 | 1115 | debug("Sending command: %.*s", len, (u_char *)buffer_ptr(&command)); |
3c0ef626 | 1116 | channel_request_start(id, "exec", 0); |
1117 | } | |
1118 | packet_put_string(buffer_ptr(&command), buffer_len(&command)); | |
1119 | packet_send(); | |
1120 | } else { | |
c6046bb0 | 1121 | channel_request_start(id, "shell", 0); |
1122 | packet_send(); | |
3c0ef626 | 1123 | } |
3c0ef626 | 1124 | |
3c0ef626 | 1125 | packet_set_interactive(interactive); |
1126 | } | |
1127 | ||
1128 | /* open new channel for a session */ | |
1129 | static int | |
1130 | ssh_session2_open(void) | |
1131 | { | |
1132 | Channel *c; | |
1133 | int window, packetmax, in, out, err; | |
1134 | ||
1135 | if (stdin_null_flag) { | |
1136 | in = open(_PATH_DEVNULL, O_RDONLY); | |
1137 | } else { | |
1138 | in = dup(STDIN_FILENO); | |
1139 | } | |
1140 | out = dup(STDOUT_FILENO); | |
1141 | err = dup(STDERR_FILENO); | |
1142 | ||
1143 | if (in < 0 || out < 0 || err < 0) | |
1144 | fatal("dup() in/out/err failed"); | |
1145 | ||
1146 | /* enable nonblocking unless tty */ | |
1147 | if (!isatty(in)) | |
1148 | set_nonblock(in); | |
1149 | if (!isatty(out)) | |
1150 | set_nonblock(out); | |
1151 | if (!isatty(err)) | |
1152 | set_nonblock(err); | |
1153 | ||
1154 | window = CHAN_SES_WINDOW_DEFAULT; | |
1155 | packetmax = CHAN_SES_PACKET_DEFAULT; | |
c6046bb0 | 1156 | if (tty_flag) { |
1157 | window >>= 1; | |
1158 | packetmax >>= 1; | |
3c0ef626 | 1159 | } |
1160 | c = channel_new( | |
1161 | "session", SSH_CHANNEL_OPENING, in, out, err, | |
1162 | window, packetmax, CHAN_EXTENDED_WRITE, | |
1163 | xstrdup("client-session"), /*nonblock*/0); | |
3c0ef626 | 1164 | |
1165 | debug3("ssh_session2_open: channel_new: %d", c->self); | |
1166 | ||
1167 | channel_send_open(c->self); | |
1168 | if (!no_shell_flag) | |
c6046bb0 | 1169 | channel_register_confirm(c->self, ssh_session2_setup); |
3c0ef626 | 1170 | |
1171 | return c->self; | |
1172 | } | |
1173 | ||
1174 | static int | |
1175 | ssh_session2(void) | |
1176 | { | |
1177 | int id = -1; | |
1178 | ||
1179 | /* XXX should be pre-session */ | |
1180 | ssh_init_forwarding(); | |
1181 | ||
1182 | if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN)) | |
1183 | id = ssh_session2_open(); | |
1184 | ||
1185 | /* If requested, let ssh continue in the background. */ | |
1186 | if (fork_after_authentication_flag) | |
1187 | if (daemon(1, 1) < 0) | |
1188 | fatal("daemon() failed: %.200s", strerror(errno)); | |
1189 | ||
1190 | return client_loop(tty_flag, tty_flag ? | |
1191 | options.escape_char : SSH_ESCAPECHAR_NONE, id); | |
1192 | } | |
1193 | ||
1194 | static void | |
1195 | load_public_identity_files(void) | |
1196 | { | |
1197 | char *filename; | |
3c0ef626 | 1198 | int i = 0; |
c6046bb0 | 1199 | Key *public; |
3c0ef626 | 1200 | #ifdef SMARTCARD |
c6046bb0 | 1201 | Key **keys; |
1202 | ||
3c0ef626 | 1203 | if (options.smartcard_device != NULL && |
c6046bb0 | 1204 | options.num_identity_files < SSH_MAX_IDENTITY_FILES && |
1205 | (keys = sc_get_keys(options.smartcard_device, NULL)) != NULL ) { | |
1206 | int count = 0; | |
1207 | for (i = 0; keys[i] != NULL; i++) { | |
1208 | count++; | |
1209 | memmove(&options.identity_files[1], &options.identity_files[0], | |
1210 | sizeof(char *) * (SSH_MAX_IDENTITY_FILES - 1)); | |
1211 | memmove(&options.identity_keys[1], &options.identity_keys[0], | |
1212 | sizeof(Key *) * (SSH_MAX_IDENTITY_FILES - 1)); | |
1213 | options.num_identity_files++; | |
1214 | options.identity_keys[0] = keys[i]; | |
1215 | options.identity_files[0] = xstrdup("smartcard key");; | |
1216 | } | |
1217 | if (options.num_identity_files > SSH_MAX_IDENTITY_FILES) | |
1218 | options.num_identity_files = SSH_MAX_IDENTITY_FILES; | |
1219 | i = count; | |
1220 | xfree(keys); | |
3c0ef626 | 1221 | } |
1222 | #endif /* SMARTCARD */ | |
1223 | for (; i < options.num_identity_files; i++) { | |
1224 | filename = tilde_expand_filename(options.identity_files[i], | |
1225 | original_real_uid); | |
1226 | public = key_load_public(filename, NULL); | |
1227 | debug("identity file %s type %d", filename, | |
1228 | public ? public->type : -1); | |
1229 | xfree(options.identity_files[i]); | |
1230 | options.identity_files[i] = filename; | |
1231 | options.identity_keys[i] = public; | |
1232 | } | |
1233 | } |