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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. | |
16 | * Copyright (c) 2000, 2001, 2002 Markus Friedl. All rights reserved. | |
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" | |
43 | RCSID("$OpenBSD: ssh.c,v 1.197 2003/07/16 10:34:53 markus Exp $"); | |
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" | |
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 | |
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 debug mode is on. This can be set on the command line. */ | |
83 | int debug_flag = 0; | |
84 | ||
85 | /* Flag indicating whether a tty should be allocated */ | |
86 | int tty_flag = 0; | |
87 | int no_tty_flag = 0; | |
88 | int force_tty_flag = 0; | |
89 | ||
90 | /* don't exec a shell */ | |
91 | int no_shell_flag = 0; | |
92 | ||
93 | /* | |
94 | * Flag indicating that nothing should be read from stdin. This can be set | |
95 | * on the command line. | |
96 | */ | |
97 | int stdin_null_flag = 0; | |
98 | ||
99 | /* | |
100 | * Flag indicating that ssh should fork after authentication. This is useful | |
101 | * so that the passphrase can be entered manually, and then ssh goes to the | |
102 | * background. | |
103 | */ | |
104 | int fork_after_authentication_flag = 0; | |
105 | ||
106 | /* | |
107 | * General data structure for command line options and options configurable | |
108 | * in configuration files. See readconf.h. | |
109 | */ | |
110 | Options options; | |
111 | ||
112 | /* optional user configfile */ | |
113 | char *config = NULL; | |
114 | ||
115 | /* | |
116 | * Name of the host we are connecting to. This is the name given on the | |
117 | * command line, or the HostName specified for the user-supplied name in a | |
118 | * configuration file. | |
119 | */ | |
120 | char *host; | |
121 | ||
122 | /* socket address the host resolves to */ | |
123 | struct sockaddr_storage hostaddr; | |
124 | ||
125 | /* Private host keys. */ | |
126 | Sensitive sensitive_data; | |
127 | ||
128 | /* Original real UID. */ | |
129 | uid_t original_real_uid; | |
130 | uid_t original_effective_uid; | |
131 | ||
132 | /* command to be executed */ | |
133 | Buffer command; | |
134 | ||
135 | /* Should we execute a command or invoke a subsystem? */ | |
136 | int subsystem_flag = 0; | |
137 | ||
138 | /* # of replies received for global requests */ | |
139 | static int client_global_request_id = 0; | |
140 | ||
141 | /* pid of proxycommand child process */ | |
142 | pid_t proxy_command_pid = 0; | |
143 | ||
144 | /* Prints a help message to the user. This function never returns. */ | |
145 | ||
146 | static void | |
147 | usage(void) | |
148 | { | |
149 | fprintf(stderr, "Usage: %s [options] host [command]\n", __progname); | |
150 | fprintf(stderr, "Options:\n"); | |
151 | fprintf(stderr, " -l user Log in using this user name.\n"); | |
152 | fprintf(stderr, " -n Redirect input from " _PATH_DEVNULL ".\n"); | |
153 | fprintf(stderr, " -F config Config file (default: ~/%s).\n", | |
154 | _PATH_SSH_USER_CONFFILE); | |
155 | fprintf(stderr, " -A Enable authentication agent forwarding.\n"); | |
156 | fprintf(stderr, " -a Disable authentication agent forwarding (default).\n"); | |
157 | #ifdef AFS | |
158 | fprintf(stderr, " -k Disable Kerberos ticket and AFS token forwarding.\n"); | |
159 | #endif /* AFS */ | |
160 | fprintf(stderr, " -X Enable X11 connection forwarding.\n"); | |
161 | fprintf(stderr, " -x Disable X11 connection forwarding (default).\n"); | |
162 | fprintf(stderr, " -i file Identity for public key authentication " | |
163 | "(default: ~/.ssh/identity)\n"); | |
164 | #ifdef SMARTCARD | |
165 | fprintf(stderr, " -I reader Set smartcard reader.\n"); | |
166 | #endif | |
167 | fprintf(stderr, " -t Tty; allocate a tty even if command is given.\n"); | |
168 | fprintf(stderr, " -T Do not allocate a tty.\n"); | |
169 | fprintf(stderr, " -v Verbose; display verbose debugging messages.\n"); | |
170 | fprintf(stderr, " Multiple -v increases verbosity.\n"); | |
171 | fprintf(stderr, " -V Display version number only.\n"); | |
172 | fprintf(stderr, " -q Quiet; don't display any warning messages.\n"); | |
173 | fprintf(stderr, " -f Fork into background after authentication.\n"); | |
174 | fprintf(stderr, " -e char Set escape character; ``none'' = disable (default: ~).\n"); | |
175 | ||
176 | fprintf(stderr, " -c cipher Select encryption algorithm\n"); | |
177 | fprintf(stderr, " -m macs Specify MAC algorithms for protocol version 2.\n"); | |
178 | fprintf(stderr, " -p port Connect to this port. Server must be on the same port.\n"); | |
179 | fprintf(stderr, " -L listen-port:host:port Forward local port to remote address\n"); | |
180 | fprintf(stderr, " -R listen-port:host:port Forward remote port to local address\n"); | |
181 | fprintf(stderr, " These cause %s to listen for connections on a port, and\n", __progname); | |
182 | fprintf(stderr, " forward them to the other side by connecting to host:port.\n"); | |
183 | fprintf(stderr, " -D port Enable dynamic application-level port forwarding.\n"); | |
184 | fprintf(stderr, " -C Enable compression.\n"); | |
185 | fprintf(stderr, " -N Do not execute a shell or command.\n"); | |
186 | fprintf(stderr, " -g Allow remote hosts to connect to forwarded ports.\n"); | |
187 | fprintf(stderr, " -1 Force protocol version 1.\n"); | |
188 | fprintf(stderr, " -2 Force protocol version 2.\n"); | |
189 | fprintf(stderr, " -4 Use IPv4 only.\n"); | |
190 | fprintf(stderr, " -6 Use IPv6 only.\n"); | |
191 | fprintf(stderr, " -o 'option' Process the option as if it was read from a configuration file.\n"); | |
192 | fprintf(stderr, " -s Invoke command (mandatory) as SSH2 subsystem.\n"); | |
193 | fprintf(stderr, " -b addr Local IP address.\n"); | |
194 | exit(1); | |
195 | } | |
196 | ||
197 | static int ssh_session(void); | |
198 | static int ssh_session2(void); | |
199 | static void load_public_identity_files(void); | |
200 | ||
201 | /* | |
202 | * Main program for the ssh client. | |
203 | */ | |
204 | int | |
205 | main(int ac, char **av) | |
206 | { | |
207 | int i, opt, exit_status; | |
208 | u_short fwd_port, fwd_host_port; | |
209 | char sfwd_port[6], sfwd_host_port[6]; | |
210 | char *p, *cp, buf[256]; | |
211 | struct stat st; | |
212 | struct passwd *pw; | |
213 | int dummy; | |
214 | extern int optind, optreset; | |
215 | extern char *optarg; | |
216 | ||
217 | __progname = get_progname(av[0]); | |
218 | init_rng(); | |
219 | ||
220 | /* | |
221 | * Save the original real uid. It will be needed later (uid-swapping | |
222 | * may clobber the real uid). | |
223 | */ | |
224 | original_real_uid = getuid(); | |
225 | original_effective_uid = geteuid(); | |
226 | ||
227 | /* | |
228 | * Use uid-swapping to give up root privileges for the duration of | |
229 | * option processing. We will re-instantiate the rights when we are | |
230 | * ready to create the privileged port, and will permanently drop | |
231 | * them when the port has been created (actually, when the connection | |
232 | * has been made, as we may need to create the port several times). | |
233 | */ | |
234 | PRIV_END; | |
235 | ||
236 | #ifdef HAVE_SETRLIMIT | |
237 | /* If we are installed setuid root be careful to not drop core. */ | |
238 | if (original_real_uid != original_effective_uid) { | |
239 | struct rlimit rlim; | |
240 | rlim.rlim_cur = rlim.rlim_max = 0; | |
241 | if (setrlimit(RLIMIT_CORE, &rlim) < 0) | |
242 | fatal("setrlimit failed: %.100s", strerror(errno)); | |
243 | } | |
244 | #endif | |
245 | /* Get user data. */ | |
246 | pw = getpwuid(original_real_uid); | |
247 | if (!pw) { | |
248 | logit("You don't exist, go away!"); | |
249 | exit(1); | |
250 | } | |
251 | /* Take a copy of the returned structure. */ | |
252 | pw = pwcopy(pw); | |
253 | ||
254 | /* | |
255 | * Set our umask to something reasonable, as some files are created | |
256 | * with the default umask. This will make them world-readable but | |
257 | * writable only by the owner, which is ok for all files for which we | |
258 | * don't set the modes explicitly. | |
259 | */ | |
260 | umask(022); | |
261 | ||
262 | /* Initialize option structure to indicate that no values have been set. */ | |
263 | initialize_options(&options); | |
264 | ||
265 | /* Parse command-line arguments. */ | |
266 | host = NULL; | |
267 | ||
268 | again: | |
269 | while ((opt = getopt(ac, av, | |
270 | "1246ab:c:e:fgi:kl:m:no:p:qstvxACD:F:I:L:NPR:TVX")) != -1) { | |
271 | switch (opt) { | |
272 | case '1': | |
273 | options.protocol = SSH_PROTO_1; | |
274 | break; | |
275 | case '2': | |
276 | options.protocol = SSH_PROTO_2; | |
277 | break; | |
278 | case '4': | |
279 | options.address_family = AF_INET; | |
280 | break; | |
281 | case '6': | |
282 | options.address_family = AF_INET6; | |
283 | break; | |
284 | case 'n': | |
285 | stdin_null_flag = 1; | |
286 | break; | |
287 | case 'f': | |
288 | fork_after_authentication_flag = 1; | |
289 | stdin_null_flag = 1; | |
290 | break; | |
291 | case 'x': | |
292 | options.forward_x11 = 0; | |
293 | break; | |
294 | case 'X': | |
295 | options.forward_x11 = 1; | |
296 | break; | |
297 | case 'g': | |
298 | options.gateway_ports = 1; | |
299 | break; | |
300 | case 'P': /* deprecated */ | |
301 | options.use_privileged_port = 0; | |
302 | break; | |
303 | case 'a': | |
304 | options.forward_agent = 0; | |
305 | break; | |
306 | case 'A': | |
307 | options.forward_agent = 1; | |
308 | break; | |
309 | #ifdef AFS | |
310 | case 'k': | |
311 | options.kerberos_tgt_passing = 0; | |
312 | options.afs_token_passing = 0; | |
313 | break; | |
314 | #endif | |
315 | case 'i': | |
316 | if (stat(optarg, &st) < 0) { | |
317 | fprintf(stderr, "Warning: Identity file %s " | |
318 | "does not exist.\n", optarg); | |
319 | break; | |
320 | } | |
321 | if (options.num_identity_files >= | |
322 | SSH_MAX_IDENTITY_FILES) | |
323 | fatal("Too many identity files specified " | |
324 | "(max %d)", SSH_MAX_IDENTITY_FILES); | |
325 | options.identity_files[options.num_identity_files++] = | |
326 | xstrdup(optarg); | |
327 | break; | |
328 | case 'I': | |
329 | #ifdef SMARTCARD | |
330 | options.smartcard_device = xstrdup(optarg); | |
331 | #else | |
332 | fprintf(stderr, "no support for smartcards.\n"); | |
333 | #endif | |
334 | break; | |
335 | case 't': | |
336 | if (tty_flag) | |
337 | force_tty_flag = 1; | |
338 | tty_flag = 1; | |
339 | break; | |
340 | case 'v': | |
341 | if (debug_flag == 0) { | |
342 | debug_flag = 1; | |
343 | options.log_level = SYSLOG_LEVEL_DEBUG1; | |
344 | } else { | |
345 | if (options.log_level < SYSLOG_LEVEL_DEBUG3) | |
346 | options.log_level++; | |
347 | break; | |
348 | } | |
349 | /* fallthrough */ | |
350 | case 'V': | |
351 | fprintf(stderr, | |
352 | "%s, SSH protocols %d.%d/%d.%d, %s\n", | |
353 | SSH_VERSION, | |
354 | PROTOCOL_MAJOR_1, PROTOCOL_MINOR_1, | |
355 | PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2, | |
356 | SSLeay_version(SSLEAY_VERSION)); | |
357 | if (opt == 'V') | |
358 | exit(0); | |
359 | break; | |
360 | case 'q': | |
361 | options.log_level = SYSLOG_LEVEL_QUIET; | |
362 | break; | |
363 | case 'e': | |
364 | if (optarg[0] == '^' && optarg[2] == 0 && | |
365 | (u_char) optarg[1] >= 64 && | |
366 | (u_char) optarg[1] < 128) | |
367 | options.escape_char = (u_char) optarg[1] & 31; | |
368 | else if (strlen(optarg) == 1) | |
369 | options.escape_char = (u_char) optarg[0]; | |
370 | else if (strcmp(optarg, "none") == 0) | |
371 | options.escape_char = SSH_ESCAPECHAR_NONE; | |
372 | else { | |
373 | fprintf(stderr, "Bad escape character '%s'.\n", | |
374 | optarg); | |
375 | exit(1); | |
376 | } | |
377 | break; | |
378 | case 'c': | |
379 | if (ciphers_valid(optarg)) { | |
380 | /* SSH2 only */ | |
381 | options.ciphers = xstrdup(optarg); | |
382 | options.cipher = SSH_CIPHER_ILLEGAL; | |
383 | } else { | |
384 | /* SSH1 only */ | |
385 | options.cipher = cipher_number(optarg); | |
386 | if (options.cipher == -1) { | |
387 | fprintf(stderr, | |
388 | "Unknown cipher type '%s'\n", | |
389 | optarg); | |
390 | exit(1); | |
391 | } | |
392 | if (options.cipher == SSH_CIPHER_3DES) | |
393 | options.ciphers = "3des-cbc"; | |
394 | else if (options.cipher == SSH_CIPHER_BLOWFISH) | |
395 | options.ciphers = "blowfish-cbc"; | |
396 | else | |
397 | options.ciphers = (char *)-1; | |
398 | } | |
399 | break; | |
400 | case 'm': | |
401 | if (mac_valid(optarg)) | |
402 | options.macs = xstrdup(optarg); | |
403 | else { | |
404 | fprintf(stderr, "Unknown mac type '%s'\n", | |
405 | optarg); | |
406 | exit(1); | |
407 | } | |
408 | break; | |
409 | case 'p': | |
410 | options.port = a2port(optarg); | |
411 | if (options.port == 0) { | |
412 | fprintf(stderr, "Bad port '%s'\n", optarg); | |
413 | exit(1); | |
414 | } | |
415 | break; | |
416 | case 'l': | |
417 | options.user = optarg; | |
418 | break; | |
419 | ||
420 | case 'L': | |
421 | case 'R': | |
422 | if (sscanf(optarg, "%5[0123456789]:%255[^:]:%5[0123456789]", | |
423 | sfwd_port, buf, sfwd_host_port) != 3 && | |
424 | sscanf(optarg, "%5[0123456789]/%255[^/]/%5[0123456789]", | |
425 | sfwd_port, buf, sfwd_host_port) != 3) { | |
426 | fprintf(stderr, | |
427 | "Bad forwarding specification '%s'\n", | |
428 | optarg); | |
429 | usage(); | |
430 | /* NOTREACHED */ | |
431 | } | |
432 | if ((fwd_port = a2port(sfwd_port)) == 0 || | |
433 | (fwd_host_port = a2port(sfwd_host_port)) == 0) { | |
434 | fprintf(stderr, | |
435 | "Bad forwarding port(s) '%s'\n", optarg); | |
436 | exit(1); | |
437 | } | |
438 | if (opt == 'L') | |
439 | add_local_forward(&options, fwd_port, buf, | |
440 | fwd_host_port); | |
441 | else if (opt == 'R') | |
442 | add_remote_forward(&options, fwd_port, buf, | |
443 | fwd_host_port); | |
444 | break; | |
445 | ||
446 | case 'D': | |
447 | fwd_port = a2port(optarg); | |
448 | if (fwd_port == 0) { | |
449 | fprintf(stderr, "Bad dynamic port '%s'\n", | |
450 | optarg); | |
451 | exit(1); | |
452 | } | |
453 | add_local_forward(&options, fwd_port, "socks4", 0); | |
454 | break; | |
455 | ||
456 | case 'C': | |
457 | options.compression = 1; | |
458 | break; | |
459 | case 'N': | |
460 | no_shell_flag = 1; | |
461 | no_tty_flag = 1; | |
462 | break; | |
463 | case 'T': | |
464 | no_tty_flag = 1; | |
465 | break; | |
466 | case 'o': | |
467 | dummy = 1; | |
468 | if (process_config_line(&options, host ? host : "", | |
469 | optarg, "command-line", 0, &dummy) != 0) | |
470 | exit(1); | |
471 | break; | |
472 | case 's': | |
473 | subsystem_flag = 1; | |
474 | break; | |
475 | case 'b': | |
476 | options.bind_address = optarg; | |
477 | break; | |
478 | case 'F': | |
479 | config = optarg; | |
480 | break; | |
481 | default: | |
482 | usage(); | |
483 | } | |
484 | } | |
485 | ||
486 | ac -= optind; | |
487 | av += optind; | |
488 | ||
489 | if (ac > 0 && !host && **av != '-') { | |
490 | if (strrchr(*av, '@')) { | |
491 | p = xstrdup(*av); | |
492 | cp = strrchr(p, '@'); | |
493 | if (cp == NULL || cp == p) | |
494 | usage(); | |
495 | options.user = p; | |
496 | *cp = '\0'; | |
497 | host = ++cp; | |
498 | } else | |
499 | host = *av; | |
500 | if (ac > 1) { | |
501 | optind = optreset = 1; | |
502 | goto again; | |
503 | } | |
504 | ac--, av++; | |
505 | } | |
506 | ||
507 | /* Check that we got a host name. */ | |
508 | if (!host) | |
509 | usage(); | |
510 | ||
511 | SSLeay_add_all_algorithms(); | |
512 | ERR_load_crypto_strings(); | |
513 | ||
514 | /* Initialize the command to execute on remote host. */ | |
515 | buffer_init(&command); | |
516 | ||
517 | /* | |
518 | * Save the command to execute on the remote host in a buffer. There | |
519 | * is no limit on the length of the command, except by the maximum | |
520 | * packet size. Also sets the tty flag if there is no command. | |
521 | */ | |
522 | if (!ac) { | |
523 | /* No command specified - execute shell on a tty. */ | |
524 | tty_flag = 1; | |
525 | if (subsystem_flag) { | |
526 | fprintf(stderr, | |
527 | "You must specify a subsystem to invoke.\n"); | |
528 | usage(); | |
529 | } | |
530 | } else { | |
531 | /* A command has been specified. Store it into the buffer. */ | |
532 | for (i = 0; i < ac; i++) { | |
533 | if (i) | |
534 | buffer_append(&command, " ", 1); | |
535 | buffer_append(&command, av[i], strlen(av[i])); | |
536 | } | |
537 | } | |
538 | ||
539 | /* Cannot fork to background if no command. */ | |
540 | if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag) | |
541 | fatal("Cannot fork into background without a command to execute."); | |
542 | ||
543 | /* Allocate a tty by default if no command specified. */ | |
544 | if (buffer_len(&command) == 0) | |
545 | tty_flag = 1; | |
546 | ||
547 | /* Force no tty */ | |
548 | if (no_tty_flag) | |
549 | tty_flag = 0; | |
550 | /* Do not allocate a tty if stdin is not a tty. */ | |
551 | if (!isatty(fileno(stdin)) && !force_tty_flag) { | |
552 | if (tty_flag) | |
553 | logit("Pseudo-terminal will not be allocated because stdin is not a terminal."); | |
554 | tty_flag = 0; | |
555 | } | |
556 | ||
557 | /* | |
558 | * Initialize "log" output. Since we are the client all output | |
559 | * actually goes to stderr. | |
560 | */ | |
561 | log_init(av[0], options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level, | |
562 | SYSLOG_FACILITY_USER, 1); | |
563 | ||
564 | /* | |
565 | * Read per-user configuration file. Ignore the system wide config | |
566 | * file if the user specifies a config file on the command line. | |
567 | */ | |
568 | if (config != NULL) { | |
569 | if (!read_config_file(config, host, &options)) | |
570 | fatal("Can't open user config file %.100s: " | |
571 | "%.100s", config, strerror(errno)); | |
572 | } else { | |
573 | snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, | |
574 | _PATH_SSH_USER_CONFFILE); | |
575 | (void)read_config_file(buf, host, &options); | |
576 | ||
577 | /* Read systemwide configuration file after use config. */ | |
578 | (void)read_config_file(_PATH_HOST_CONFIG_FILE, host, &options); | |
579 | } | |
580 | ||
581 | /* Fill configuration defaults. */ | |
582 | fill_default_options(&options); | |
583 | ||
584 | channel_set_af(options.address_family); | |
585 | ||
586 | /* reinit */ | |
587 | log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 1); | |
588 | ||
589 | seed_rng(); | |
590 | ||
591 | if (options.user == NULL) | |
592 | options.user = xstrdup(pw->pw_name); | |
593 | ||
594 | if (options.hostname != NULL) | |
595 | host = options.hostname; | |
596 | ||
597 | /* force lowercase for hostkey matching */ | |
598 | if (options.host_key_alias != NULL) { | |
599 | for (p = options.host_key_alias; *p; p++) | |
600 | if (isupper(*p)) | |
601 | *p = tolower(*p); | |
602 | } | |
603 | ||
604 | if (options.proxy_command != NULL && | |
605 | strcmp(options.proxy_command, "none") == 0) | |
606 | options.proxy_command = NULL; | |
607 | ||
608 | /* Disable rhosts authentication if not running as root. */ | |
609 | #ifdef HAVE_CYGWIN | |
610 | /* Ignore uid if running under Windows */ | |
611 | if (!options.use_privileged_port) { | |
612 | #else | |
613 | if (original_effective_uid != 0 || !options.use_privileged_port) { | |
614 | #endif | |
615 | debug("Rhosts Authentication disabled, " | |
616 | "originating port will not be trusted."); | |
617 | options.rhosts_authentication = 0; | |
618 | } | |
619 | /* Open a connection to the remote host. */ | |
620 | ||
621 | if (ssh_connect(host, &hostaddr, options.port, | |
622 | options.address_family, options.connection_attempts, | |
623 | #ifdef HAVE_CYGWIN | |
624 | options.use_privileged_port, | |
625 | #else | |
626 | original_effective_uid == 0 && options.use_privileged_port, | |
627 | #endif | |
628 | options.proxy_command) != 0) | |
629 | exit(1); | |
630 | ||
631 | /* | |
632 | * If we successfully made the connection, load the host private key | |
633 | * in case we will need it later for combined rsa-rhosts | |
634 | * authentication. This must be done before releasing extra | |
635 | * privileges, because the file is only readable by root. | |
636 | * If we cannot access the private keys, load the public keys | |
637 | * instead and try to execute the ssh-keysign helper instead. | |
638 | */ | |
639 | sensitive_data.nkeys = 0; | |
640 | sensitive_data.keys = NULL; | |
641 | sensitive_data.external_keysign = 0; | |
642 | if (options.rhosts_rsa_authentication || | |
643 | options.hostbased_authentication) { | |
644 | sensitive_data.nkeys = 3; | |
645 | sensitive_data.keys = xmalloc(sensitive_data.nkeys * | |
646 | sizeof(Key)); | |
647 | ||
648 | PRIV_START; | |
649 | sensitive_data.keys[0] = key_load_private_type(KEY_RSA1, | |
650 | _PATH_HOST_KEY_FILE, "", NULL); | |
651 | sensitive_data.keys[1] = key_load_private_type(KEY_DSA, | |
652 | _PATH_HOST_DSA_KEY_FILE, "", NULL); | |
653 | sensitive_data.keys[2] = key_load_private_type(KEY_RSA, | |
654 | _PATH_HOST_RSA_KEY_FILE, "", NULL); | |
655 | PRIV_END; | |
656 | ||
657 | if (options.hostbased_authentication == 1 && | |
658 | sensitive_data.keys[0] == NULL && | |
659 | sensitive_data.keys[1] == NULL && | |
660 | sensitive_data.keys[2] == NULL) { | |
661 | sensitive_data.keys[1] = key_load_public( | |
662 | _PATH_HOST_DSA_KEY_FILE, NULL); | |
663 | sensitive_data.keys[2] = key_load_public( | |
664 | _PATH_HOST_RSA_KEY_FILE, NULL); | |
665 | sensitive_data.external_keysign = 1; | |
666 | } | |
667 | } | |
668 | /* | |
669 | * Get rid of any extra privileges that we may have. We will no | |
670 | * longer need them. Also, extra privileges could make it very hard | |
671 | * to read identity files and other non-world-readable files from the | |
672 | * user's home directory if it happens to be on a NFS volume where | |
673 | * root is mapped to nobody. | |
674 | */ | |
675 | seteuid(original_real_uid); | |
676 | setuid(original_real_uid); | |
677 | ||
678 | /* | |
679 | * Now that we are back to our own permissions, create ~/.ssh | |
680 | * directory if it doesn\'t already exist. | |
681 | */ | |
682 | snprintf(buf, sizeof buf, "%.100s%s%.100s", pw->pw_dir, strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR); | |
683 | if (stat(buf, &st) < 0) | |
684 | if (mkdir(buf, 0700) < 0) | |
685 | error("Could not create directory '%.200s'.", buf); | |
686 | ||
687 | /* load options.identity_files */ | |
688 | load_public_identity_files(); | |
689 | ||
690 | /* Expand ~ in known host file names. */ | |
691 | /* XXX mem-leaks: */ | |
692 | options.system_hostfile = | |
693 | tilde_expand_filename(options.system_hostfile, original_real_uid); | |
694 | options.user_hostfile = | |
695 | tilde_expand_filename(options.user_hostfile, original_real_uid); | |
696 | options.system_hostfile2 = | |
697 | tilde_expand_filename(options.system_hostfile2, original_real_uid); | |
698 | options.user_hostfile2 = | |
699 | tilde_expand_filename(options.user_hostfile2, original_real_uid); | |
700 | ||
701 | signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */ | |
702 | ||
703 | /* Log into the remote system. This never returns if the login fails. */ | |
704 | ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr, pw); | |
705 | ||
706 | /* We no longer need the private host keys. Clear them now. */ | |
707 | if (sensitive_data.nkeys != 0) { | |
708 | for (i = 0; i < sensitive_data.nkeys; i++) { | |
709 | if (sensitive_data.keys[i] != NULL) { | |
710 | /* Destroys contents safely */ | |
711 | debug3("clear hostkey %d", i); | |
712 | key_free(sensitive_data.keys[i]); | |
713 | sensitive_data.keys[i] = NULL; | |
714 | } | |
715 | } | |
716 | xfree(sensitive_data.keys); | |
717 | } | |
718 | for (i = 0; i < options.num_identity_files; i++) { | |
719 | if (options.identity_files[i]) { | |
720 | xfree(options.identity_files[i]); | |
721 | options.identity_files[i] = NULL; | |
722 | } | |
723 | if (options.identity_keys[i]) { | |
724 | key_free(options.identity_keys[i]); | |
725 | options.identity_keys[i] = NULL; | |
726 | } | |
727 | } | |
728 | ||
729 | exit_status = compat20 ? ssh_session2() : ssh_session(); | |
730 | packet_close(); | |
731 | ||
732 | /* | |
733 | * Send SIGHUP to proxy command if used. We don't wait() in | |
734 | * case it hangs and instead rely on init to reap the child | |
735 | */ | |
736 | if (proxy_command_pid > 1) | |
737 | kill(proxy_command_pid, SIGHUP); | |
738 | ||
739 | return exit_status; | |
740 | } | |
741 | ||
742 | static void | |
743 | x11_get_proto(char **_proto, char **_data) | |
744 | { | |
745 | char line[512]; | |
746 | static char proto[512], data[512]; | |
747 | FILE *f; | |
748 | int got_data = 0, i; | |
749 | char *display; | |
750 | struct stat st; | |
751 | ||
752 | *_proto = proto; | |
753 | *_data = data; | |
754 | proto[0] = data[0] = '\0'; | |
755 | if (!options.xauth_location || | |
756 | (stat(options.xauth_location, &st) == -1)) { | |
757 | debug("No xauth program."); | |
758 | } else { | |
759 | if ((display = getenv("DISPLAY")) == NULL) { | |
760 | debug("x11_get_proto: DISPLAY not set"); | |
761 | return; | |
762 | } | |
763 | /* Try to get Xauthority information for the display. */ | |
764 | if (strncmp(display, "localhost:", 10) == 0) | |
765 | /* | |
766 | * Handle FamilyLocal case where $DISPLAY does | |
767 | * not match an authorization entry. For this we | |
768 | * just try "xauth list unix:displaynum.screennum". | |
769 | * XXX: "localhost" match to determine FamilyLocal | |
770 | * is not perfect. | |
771 | */ | |
772 | snprintf(line, sizeof line, "%s list unix:%s 2>" | |
773 | _PATH_DEVNULL, options.xauth_location, display+10); | |
774 | else | |
775 | snprintf(line, sizeof line, "%s list %.200s 2>" | |
776 | _PATH_DEVNULL, options.xauth_location, display); | |
777 | debug2("x11_get_proto: %s", line); | |
778 | f = popen(line, "r"); | |
779 | if (f && fgets(line, sizeof(line), f) && | |
780 | sscanf(line, "%*s %511s %511s", proto, data) == 2) | |
781 | got_data = 1; | |
782 | if (f) | |
783 | pclose(f); | |
784 | } | |
785 | /* | |
786 | * If we didn't get authentication data, just make up some | |
787 | * data. The forwarding code will check the validity of the | |
788 | * response anyway, and substitute this data. The X11 | |
789 | * server, however, will ignore this fake data and use | |
790 | * whatever authentication mechanisms it was using otherwise | |
791 | * for the local connection. | |
792 | */ | |
793 | if (!got_data) { | |
794 | u_int32_t rand = 0; | |
795 | ||
796 | logit("Warning: No xauth data; using fake authentication data for X11 forwarding."); | |
797 | strlcpy(proto, "MIT-MAGIC-COOKIE-1", sizeof proto); | |
798 | for (i = 0; i < 16; i++) { | |
799 | if (i % 4 == 0) | |
800 | rand = arc4random(); | |
801 | snprintf(data + 2 * i, sizeof data - 2 * i, "%02x", rand & 0xff); | |
802 | rand >>= 8; | |
803 | } | |
804 | } | |
805 | } | |
806 | ||
807 | static void | |
808 | ssh_init_forwarding(void) | |
809 | { | |
810 | int success = 0; | |
811 | int i; | |
812 | ||
813 | /* Initiate local TCP/IP port forwardings. */ | |
814 | for (i = 0; i < options.num_local_forwards; i++) { | |
815 | debug("Connections to local port %d forwarded to remote address %.200s:%d", | |
816 | options.local_forwards[i].port, | |
817 | options.local_forwards[i].host, | |
818 | options.local_forwards[i].host_port); | |
819 | success += channel_setup_local_fwd_listener( | |
820 | options.local_forwards[i].port, | |
821 | options.local_forwards[i].host, | |
822 | options.local_forwards[i].host_port, | |
823 | options.gateway_ports); | |
824 | } | |
825 | if (i > 0 && success == 0) | |
826 | error("Could not request local forwarding."); | |
827 | ||
828 | /* Initiate remote TCP/IP port forwardings. */ | |
829 | for (i = 0; i < options.num_remote_forwards; i++) { | |
830 | debug("Connections to remote port %d forwarded to local address %.200s:%d", | |
831 | options.remote_forwards[i].port, | |
832 | options.remote_forwards[i].host, | |
833 | options.remote_forwards[i].host_port); | |
834 | channel_request_remote_forwarding( | |
835 | options.remote_forwards[i].port, | |
836 | options.remote_forwards[i].host, | |
837 | options.remote_forwards[i].host_port); | |
838 | } | |
839 | } | |
840 | ||
841 | static void | |
842 | check_agent_present(void) | |
843 | { | |
844 | if (options.forward_agent) { | |
845 | /* Clear agent forwarding if we don\'t have an agent. */ | |
846 | if (!ssh_agent_present()) | |
847 | options.forward_agent = 0; | |
848 | } | |
849 | } | |
850 | ||
851 | static int | |
852 | ssh_session(void) | |
853 | { | |
854 | int type; | |
855 | int interactive = 0; | |
856 | int have_tty = 0; | |
857 | struct winsize ws; | |
858 | char *cp; | |
859 | ||
860 | /* Enable compression if requested. */ | |
861 | if (options.compression) { | |
862 | debug("Requesting compression at level %d.", options.compression_level); | |
863 | ||
864 | if (options.compression_level < 1 || options.compression_level > 9) | |
865 | fatal("Compression level must be from 1 (fast) to 9 (slow, best)."); | |
866 | ||
867 | /* Send the request. */ | |
868 | packet_start(SSH_CMSG_REQUEST_COMPRESSION); | |
869 | packet_put_int(options.compression_level); | |
870 | packet_send(); | |
871 | packet_write_wait(); | |
872 | type = packet_read(); | |
873 | if (type == SSH_SMSG_SUCCESS) | |
874 | packet_start_compression(options.compression_level); | |
875 | else if (type == SSH_SMSG_FAILURE) | |
876 | logit("Warning: Remote host refused compression."); | |
877 | else | |
878 | packet_disconnect("Protocol error waiting for compression response."); | |
879 | } | |
880 | /* Allocate a pseudo tty if appropriate. */ | |
881 | if (tty_flag) { | |
882 | debug("Requesting pty."); | |
883 | ||
884 | /* Start the packet. */ | |
885 | packet_start(SSH_CMSG_REQUEST_PTY); | |
886 | ||
887 | /* Store TERM in the packet. There is no limit on the | |
888 | length of the string. */ | |
889 | cp = getenv("TERM"); | |
890 | if (!cp) | |
891 | cp = ""; | |
892 | packet_put_cstring(cp); | |
893 | ||
894 | /* Store window size in the packet. */ | |
895 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) | |
896 | memset(&ws, 0, sizeof(ws)); | |
897 | packet_put_int(ws.ws_row); | |
898 | packet_put_int(ws.ws_col); | |
899 | packet_put_int(ws.ws_xpixel); | |
900 | packet_put_int(ws.ws_ypixel); | |
901 | ||
902 | /* Store tty modes in the packet. */ | |
903 | tty_make_modes(fileno(stdin), NULL); | |
904 | ||
905 | /* Send the packet, and wait for it to leave. */ | |
906 | packet_send(); | |
907 | packet_write_wait(); | |
908 | ||
909 | /* Read response from the server. */ | |
910 | type = packet_read(); | |
911 | if (type == SSH_SMSG_SUCCESS) { | |
912 | interactive = 1; | |
913 | have_tty = 1; | |
914 | } else if (type == SSH_SMSG_FAILURE) | |
915 | logit("Warning: Remote host failed or refused to allocate a pseudo tty."); | |
916 | else | |
917 | packet_disconnect("Protocol error waiting for pty request response."); | |
918 | } | |
919 | /* Request X11 forwarding if enabled and DISPLAY is set. */ | |
920 | if (options.forward_x11 && getenv("DISPLAY") != NULL) { | |
921 | char *proto, *data; | |
922 | /* Get reasonable local authentication information. */ | |
923 | x11_get_proto(&proto, &data); | |
924 | /* Request forwarding with authentication spoofing. */ | |
925 | debug("Requesting X11 forwarding with authentication spoofing."); | |
926 | x11_request_forwarding_with_spoofing(0, proto, data); | |
927 | ||
928 | /* Read response from the server. */ | |
929 | type = packet_read(); | |
930 | if (type == SSH_SMSG_SUCCESS) { | |
931 | interactive = 1; | |
932 | } else if (type == SSH_SMSG_FAILURE) { | |
933 | logit("Warning: Remote host denied X11 forwarding."); | |
934 | } else { | |
935 | packet_disconnect("Protocol error waiting for X11 forwarding"); | |
936 | } | |
937 | } | |
938 | /* Tell the packet module whether this is an interactive session. */ | |
939 | packet_set_interactive(interactive); | |
940 | ||
941 | /* Request authentication agent forwarding if appropriate. */ | |
942 | check_agent_present(); | |
943 | ||
944 | if (options.forward_agent) { | |
945 | debug("Requesting authentication agent forwarding."); | |
946 | auth_request_forwarding(); | |
947 | ||
948 | /* Read response from the server. */ | |
949 | type = packet_read(); | |
950 | packet_check_eom(); | |
951 | if (type != SSH_SMSG_SUCCESS) | |
952 | logit("Warning: Remote host denied authentication agent forwarding."); | |
953 | } | |
954 | ||
955 | /* Initiate port forwardings. */ | |
956 | ssh_init_forwarding(); | |
957 | ||
958 | /* If requested, let ssh continue in the background. */ | |
959 | if (fork_after_authentication_flag) | |
960 | if (daemon(1, 1) < 0) | |
961 | fatal("daemon() failed: %.200s", strerror(errno)); | |
962 | ||
963 | /* | |
964 | * If a command was specified on the command line, execute the | |
965 | * command now. Otherwise request the server to start a shell. | |
966 | */ | |
967 | if (buffer_len(&command) > 0) { | |
968 | int len = buffer_len(&command); | |
969 | if (len > 900) | |
970 | len = 900; | |
971 | debug("Sending command: %.*s", len, (u_char *)buffer_ptr(&command)); | |
972 | packet_start(SSH_CMSG_EXEC_CMD); | |
973 | packet_put_string(buffer_ptr(&command), buffer_len(&command)); | |
974 | packet_send(); | |
975 | packet_write_wait(); | |
976 | } else { | |
977 | debug("Requesting shell."); | |
978 | packet_start(SSH_CMSG_EXEC_SHELL); | |
979 | packet_send(); | |
980 | packet_write_wait(); | |
981 | } | |
982 | ||
983 | /* Enter the interactive session. */ | |
984 | return client_loop(have_tty, tty_flag ? | |
985 | options.escape_char : SSH_ESCAPECHAR_NONE, 0); | |
986 | } | |
987 | ||
988 | static void | |
989 | client_subsystem_reply(int type, u_int32_t seq, void *ctxt) | |
990 | { | |
991 | int id, len; | |
992 | ||
993 | id = packet_get_int(); | |
994 | len = buffer_len(&command); | |
995 | if (len > 900) | |
996 | len = 900; | |
997 | packet_check_eom(); | |
998 | if (type == SSH2_MSG_CHANNEL_FAILURE) | |
999 | fatal("Request for subsystem '%.*s' failed on channel %d", | |
1000 | len, (u_char *)buffer_ptr(&command), id); | |
1001 | } | |
1002 | ||
1003 | void | |
1004 | client_global_request_reply(int type, u_int32_t seq, void *ctxt) | |
1005 | { | |
1006 | int i; | |
1007 | ||
1008 | i = client_global_request_id++; | |
1009 | if (i >= options.num_remote_forwards) { | |
1010 | debug("client_global_request_reply: too many replies %d > %d", | |
1011 | i, options.num_remote_forwards); | |
1012 | return; | |
1013 | } | |
1014 | debug("remote forward %s for: listen %d, connect %s:%d", | |
1015 | type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure", | |
1016 | options.remote_forwards[i].port, | |
1017 | options.remote_forwards[i].host, | |
1018 | options.remote_forwards[i].host_port); | |
1019 | if (type == SSH2_MSG_REQUEST_FAILURE) | |
1020 | logit("Warning: remote port forwarding failed for listen port %d", | |
1021 | options.remote_forwards[i].port); | |
1022 | } | |
1023 | ||
1024 | /* request pty/x11/agent/tcpfwd/shell for channel */ | |
1025 | static void | |
1026 | ssh_session2_setup(int id, void *arg) | |
1027 | { | |
1028 | int len; | |
1029 | int interactive = 0; | |
1030 | struct termios tio; | |
1031 | ||
1032 | debug2("ssh_session2_setup: id %d", id); | |
1033 | ||
1034 | if (tty_flag) { | |
1035 | struct winsize ws; | |
1036 | char *cp; | |
1037 | cp = getenv("TERM"); | |
1038 | if (!cp) | |
1039 | cp = ""; | |
1040 | /* Store window size in the packet. */ | |
1041 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) | |
1042 | memset(&ws, 0, sizeof(ws)); | |
1043 | ||
1044 | channel_request_start(id, "pty-req", 0); | |
1045 | packet_put_cstring(cp); | |
1046 | packet_put_int(ws.ws_col); | |
1047 | packet_put_int(ws.ws_row); | |
1048 | packet_put_int(ws.ws_xpixel); | |
1049 | packet_put_int(ws.ws_ypixel); | |
1050 | tio = get_saved_tio(); | |
1051 | tty_make_modes(/*ignored*/ 0, &tio); | |
1052 | packet_send(); | |
1053 | interactive = 1; | |
1054 | /* XXX wait for reply */ | |
1055 | } | |
1056 | if (options.forward_x11 && | |
1057 | getenv("DISPLAY") != NULL) { | |
1058 | char *proto, *data; | |
1059 | /* Get reasonable local authentication information. */ | |
1060 | x11_get_proto(&proto, &data); | |
1061 | /* Request forwarding with authentication spoofing. */ | |
1062 | debug("Requesting X11 forwarding with authentication spoofing."); | |
1063 | x11_request_forwarding_with_spoofing(id, proto, data); | |
1064 | interactive = 1; | |
1065 | /* XXX wait for reply */ | |
1066 | } | |
1067 | ||
1068 | check_agent_present(); | |
1069 | if (options.forward_agent) { | |
1070 | debug("Requesting authentication agent forwarding."); | |
1071 | channel_request_start(id, "auth-agent-req@openssh.com", 0); | |
1072 | packet_send(); | |
1073 | } | |
1074 | ||
1075 | len = buffer_len(&command); | |
1076 | if (len > 0) { | |
1077 | if (len > 900) | |
1078 | len = 900; | |
1079 | if (subsystem_flag) { | |
1080 | debug("Sending subsystem: %.*s", len, (u_char *)buffer_ptr(&command)); | |
1081 | channel_request_start(id, "subsystem", /*want reply*/ 1); | |
1082 | /* register callback for reply */ | |
1083 | /* XXX we assume that client_loop has already been called */ | |
1084 | dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &client_subsystem_reply); | |
1085 | dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &client_subsystem_reply); | |
1086 | } else { | |
1087 | debug("Sending command: %.*s", len, (u_char *)buffer_ptr(&command)); | |
1088 | channel_request_start(id, "exec", 0); | |
1089 | } | |
1090 | packet_put_string(buffer_ptr(&command), buffer_len(&command)); | |
1091 | packet_send(); | |
1092 | } else { | |
1093 | channel_request_start(id, "shell", 0); | |
1094 | packet_send(); | |
1095 | } | |
1096 | ||
1097 | packet_set_interactive(interactive); | |
1098 | } | |
1099 | ||
1100 | /* open new channel for a session */ | |
1101 | static int | |
1102 | ssh_session2_open(void) | |
1103 | { | |
1104 | Channel *c; | |
1105 | int window, packetmax, in, out, err; | |
1106 | ||
1107 | if (stdin_null_flag) { | |
1108 | in = open(_PATH_DEVNULL, O_RDONLY); | |
1109 | } else { | |
1110 | in = dup(STDIN_FILENO); | |
1111 | } | |
1112 | out = dup(STDOUT_FILENO); | |
1113 | err = dup(STDERR_FILENO); | |
1114 | ||
1115 | if (in < 0 || out < 0 || err < 0) | |
1116 | fatal("dup() in/out/err failed"); | |
1117 | ||
1118 | /* enable nonblocking unless tty */ | |
1119 | if (!isatty(in)) | |
1120 | set_nonblock(in); | |
1121 | if (!isatty(out)) | |
1122 | set_nonblock(out); | |
1123 | if (!isatty(err)) | |
1124 | set_nonblock(err); | |
1125 | ||
1126 | window = CHAN_SES_WINDOW_DEFAULT; | |
1127 | packetmax = CHAN_SES_PACKET_DEFAULT; | |
1128 | if (tty_flag) { | |
1129 | window >>= 1; | |
1130 | packetmax >>= 1; | |
1131 | } | |
1132 | c = channel_new( | |
1133 | "session", SSH_CHANNEL_OPENING, in, out, err, | |
1134 | window, packetmax, CHAN_EXTENDED_WRITE, | |
1135 | "client-session", /*nonblock*/0); | |
1136 | ||
1137 | debug3("ssh_session2_open: channel_new: %d", c->self); | |
1138 | ||
1139 | channel_send_open(c->self); | |
1140 | if (!no_shell_flag) | |
1141 | channel_register_confirm(c->self, ssh_session2_setup); | |
1142 | ||
1143 | return c->self; | |
1144 | } | |
1145 | ||
1146 | static int | |
1147 | ssh_session2(void) | |
1148 | { | |
1149 | int id = -1; | |
1150 | ||
1151 | /* XXX should be pre-session */ | |
1152 | ssh_init_forwarding(); | |
1153 | ||
1154 | if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN)) | |
1155 | id = ssh_session2_open(); | |
1156 | ||
1157 | /* If requested, let ssh continue in the background. */ | |
1158 | if (fork_after_authentication_flag) | |
1159 | if (daemon(1, 1) < 0) | |
1160 | fatal("daemon() failed: %.200s", strerror(errno)); | |
1161 | ||
1162 | return client_loop(tty_flag, tty_flag ? | |
1163 | options.escape_char : SSH_ESCAPECHAR_NONE, id); | |
1164 | } | |
1165 | ||
1166 | static void | |
1167 | load_public_identity_files(void) | |
1168 | { | |
1169 | char *filename; | |
1170 | int i = 0; | |
1171 | Key *public; | |
1172 | #ifdef SMARTCARD | |
1173 | Key **keys; | |
1174 | ||
1175 | if (options.smartcard_device != NULL && | |
1176 | options.num_identity_files < SSH_MAX_IDENTITY_FILES && | |
1177 | (keys = sc_get_keys(options.smartcard_device, NULL)) != NULL ) { | |
1178 | int count = 0; | |
1179 | for (i = 0; keys[i] != NULL; i++) { | |
1180 | count++; | |
1181 | memmove(&options.identity_files[1], &options.identity_files[0], | |
1182 | sizeof(char *) * (SSH_MAX_IDENTITY_FILES - 1)); | |
1183 | memmove(&options.identity_keys[1], &options.identity_keys[0], | |
1184 | sizeof(Key *) * (SSH_MAX_IDENTITY_FILES - 1)); | |
1185 | options.num_identity_files++; | |
1186 | options.identity_keys[0] = keys[i]; | |
1187 | options.identity_files[0] = sc_get_key_label(keys[i]); | |
1188 | } | |
1189 | if (options.num_identity_files > SSH_MAX_IDENTITY_FILES) | |
1190 | options.num_identity_files = SSH_MAX_IDENTITY_FILES; | |
1191 | i = count; | |
1192 | xfree(keys); | |
1193 | } | |
1194 | #endif /* SMARTCARD */ | |
1195 | for (; i < options.num_identity_files; i++) { | |
1196 | filename = tilde_expand_filename(options.identity_files[i], | |
1197 | original_real_uid); | |
1198 | public = key_load_public(filename, NULL); | |
1199 | debug("identity file %s type %d", filename, | |
1200 | public ? public->type : -1); | |
1201 | xfree(options.identity_files[i]); | |
1202 | options.identity_files[i] = filename; | |
1203 | options.identity_keys[i] = public; | |
1204 | } | |
1205 | } |