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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 1.171 2002/05/16 22:09:59 stevesk 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 "uidswap.h" | |
57 | #include "channels.h" | |
58 | #include "key.h" | |
59 | #include "authfd.h" | |
60 | #include "authfile.h" | |
61 | #include "pathnames.h" | |
62 | #include "clientloop.h" | |
63 | #include "log.h" | |
64 | #include "readconf.h" | |
65 | #include "sshconnect.h" | |
66 | #include "tildexpand.h" | |
67 | #include "dispatch.h" | |
68 | #include "misc.h" | |
69 | #include "kex.h" | |
70 | #include "mac.h" | |
71 | #include "sshtty.h" | |
72 | ||
73 | #ifdef SMARTCARD | |
74 | #include "scard.h" | |
75 | #endif | |
76 | ||
77 | #ifdef HAVE___PROGNAME | |
78 | extern char *__progname; | |
79 | #else | |
80 | char *__progname; | |
81 | #endif | |
82 | ||
83 | /* Flag indicating whether IPv4 or IPv6. This can be set on the command line. | |
84 | Default value is AF_UNSPEC means both IPv4 and IPv6. */ | |
85 | #ifdef IPV4_DEFAULT | |
86 | int IPv4or6 = AF_INET; | |
87 | #else | |
88 | int IPv4or6 = AF_UNSPEC; | |
89 | #endif | |
90 | ||
91 | /* Flag indicating whether debug mode is on. This can be set on the command line. */ | |
92 | int debug_flag = 0; | |
93 | ||
94 | /* Flag indicating whether a tty should be allocated */ | |
95 | int tty_flag = 0; | |
96 | int no_tty_flag = 0; | |
97 | int force_tty_flag = 0; | |
98 | ||
99 | /* don't exec a shell */ | |
100 | int no_shell_flag = 0; | |
101 | ||
102 | /* | |
103 | * Flag indicating that nothing should be read from stdin. This can be set | |
104 | * on the command line. | |
105 | */ | |
106 | int stdin_null_flag = 0; | |
107 | ||
108 | /* | |
109 | * Flag indicating that ssh should fork after authentication. This is useful | |
110 | * so that the pasphrase can be entered manually, and then ssh goes to the | |
111 | * background. | |
112 | */ | |
113 | int fork_after_authentication_flag = 0; | |
114 | ||
115 | /* | |
116 | * General data structure for command line options and options configurable | |
117 | * in configuration files. See readconf.h. | |
118 | */ | |
119 | Options options; | |
120 | ||
121 | /* optional user configfile */ | |
122 | char *config = NULL; | |
123 | ||
124 | /* | |
125 | * Name of the host we are connecting to. This is the name given on the | |
126 | * command line, or the HostName specified for the user-supplied name in a | |
127 | * configuration file. | |
128 | */ | |
129 | char *host; | |
130 | ||
131 | /* socket address the host resolves to */ | |
132 | struct sockaddr_storage hostaddr; | |
133 | ||
134 | /* Private host keys. */ | |
135 | struct { | |
136 | Key **keys; | |
137 | int nkeys; | |
138 | } sensitive_data; | |
139 | ||
140 | /* Original real UID. */ | |
141 | uid_t original_real_uid; | |
142 | ||
143 | /* command to be executed */ | |
144 | Buffer command; | |
145 | ||
146 | /* Should we execute a command or invoke a subsystem? */ | |
147 | int subsystem_flag = 0; | |
148 | ||
149 | /* # of replies received for global requests */ | |
150 | static int client_global_request_id = 0; | |
151 | ||
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"); | |
180 | fprintf(stderr, " -P Don't allocate a privileged port.\n"); | |
181 | fprintf(stderr, " -q Quiet; don't display any warning messages.\n"); | |
182 | fprintf(stderr, " -f Fork into background after authentication.\n"); | |
183 | fprintf(stderr, " -e char Set escape character; ``none'' = disable (default: ~).\n"); | |
184 | ||
185 | fprintf(stderr, " -c cipher Select encryption algorithm\n"); | |
186 | fprintf(stderr, " -m macs Specify MAC algorithms for protocol version 2.\n"); | |
187 | fprintf(stderr, " -p port Connect to this port. Server must be on the same port.\n"); | |
188 | fprintf(stderr, " -L listen-port:host:port Forward local port to remote address\n"); | |
189 | fprintf(stderr, " -R listen-port:host:port Forward remote port to local address\n"); | |
190 | fprintf(stderr, " These cause %s to listen for connections on a port, and\n", __progname); | |
191 | fprintf(stderr, " forward them to the other side by connecting to host:port.\n"); | |
192 | fprintf(stderr, " -D port Enable dynamic application-level port forwarding.\n"); | |
193 | fprintf(stderr, " -C Enable compression.\n"); | |
194 | fprintf(stderr, " -N Do not execute a shell or command.\n"); | |
195 | fprintf(stderr, " -g Allow remote hosts to connect to forwarded ports.\n"); | |
196 | fprintf(stderr, " -1 Force protocol version 1.\n"); | |
197 | fprintf(stderr, " -2 Force protocol version 2.\n"); | |
198 | fprintf(stderr, " -4 Use IPv4 only.\n"); | |
199 | fprintf(stderr, " -6 Use IPv6 only.\n"); | |
200 | fprintf(stderr, " -o 'option' Process the option as if it was read from a configuration file.\n"); | |
201 | fprintf(stderr, " -s Invoke command (mandatory) as SSH2 subsystem.\n"); | |
202 | fprintf(stderr, " -b addr Local IP address.\n"); | |
203 | exit(1); | |
204 | } | |
205 | ||
206 | /* | |
207 | * Connects to the given host using rsh (or prints an error message and exits | |
208 | * if rsh is not available). This function never returns. | |
209 | */ | |
210 | static void | |
211 | rsh_connect(char *host, char *user, Buffer * command) | |
212 | { | |
213 | char *args[10]; | |
214 | int i; | |
215 | ||
216 | log("Using rsh. WARNING: Connection will not be encrypted."); | |
217 | /* Build argument list for rsh. */ | |
218 | i = 0; | |
219 | args[i++] = _PATH_RSH; | |
220 | /* host may have to come after user on some systems */ | |
221 | args[i++] = host; | |
222 | if (user) { | |
223 | args[i++] = "-l"; | |
224 | args[i++] = user; | |
225 | } | |
226 | if (buffer_len(command) > 0) { | |
227 | buffer_append(command, "\0", 1); | |
228 | args[i++] = buffer_ptr(command); | |
229 | } | |
230 | args[i++] = NULL; | |
231 | if (debug_flag) { | |
232 | for (i = 0; args[i]; i++) { | |
233 | if (i != 0) | |
234 | fprintf(stderr, " "); | |
235 | fprintf(stderr, "%s", args[i]); | |
236 | } | |
237 | fprintf(stderr, "\n"); | |
238 | } | |
239 | execv(_PATH_RSH, args); | |
240 | perror(_PATH_RSH); | |
241 | exit(1); | |
242 | } | |
243 | ||
244 | static int ssh_session(void); | |
245 | static int ssh_session2(void); | |
246 | static void load_public_identity_files(void); | |
247 | ||
248 | /* | |
249 | * Main program for the ssh client. | |
250 | */ | |
251 | int | |
252 | main(int ac, char **av) | |
253 | { | |
254 | int i, opt, exit_status, cerr; | |
255 | u_short fwd_port, fwd_host_port; | |
256 | char sfwd_port[6], sfwd_host_port[6]; | |
257 | char *p, *cp, buf[256]; | |
258 | struct stat st; | |
259 | struct passwd *pw; | |
260 | int dummy; | |
261 | uid_t original_effective_uid; | |
262 | extern int optind, optreset; | |
263 | extern char *optarg; | |
264 | ||
265 | __progname = get_progname(av[0]); | |
266 | init_rng(); | |
267 | ||
268 | /* | |
269 | * Save the original real uid. It will be needed later (uid-swapping | |
270 | * may clobber the real uid). | |
271 | */ | |
272 | original_real_uid = getuid(); | |
273 | original_effective_uid = geteuid(); | |
274 | ||
275 | #ifdef HAVE_SETRLIMIT | |
276 | /* If we are installed setuid root be careful to not drop core. */ | |
277 | if (original_real_uid != original_effective_uid) { | |
278 | struct rlimit rlim; | |
279 | rlim.rlim_cur = rlim.rlim_max = 0; | |
280 | if (setrlimit(RLIMIT_CORE, &rlim) < 0) | |
281 | fatal("setrlimit failed: %.100s", strerror(errno)); | |
282 | } | |
283 | #endif | |
284 | /* Get user data. */ | |
285 | pw = getpwuid(original_real_uid); | |
286 | if (!pw) { | |
287 | log("You don't exist, go away!"); | |
288 | exit(1); | |
289 | } | |
290 | /* Take a copy of the returned structure. */ | |
291 | pw = pwcopy(pw); | |
292 | ||
293 | /* | |
294 | * Use uid-swapping to give up root privileges for the duration of | |
295 | * option processing. We will re-instantiate the rights when we are | |
296 | * ready to create the privileged port, and will permanently drop | |
297 | * them when the port has been created (actually, when the connection | |
298 | * has been made, as we may need to create the port several times). | |
299 | */ | |
300 | temporarily_use_uid(pw); | |
301 | ||
302 | /* | |
303 | * Set our umask to something reasonable, as some files are created | |
304 | * with the default umask. This will make them world-readable but | |
305 | * writable only by the owner, which is ok for all files for which we | |
306 | * don't set the modes explicitly. | |
307 | */ | |
308 | umask(022); | |
309 | ||
310 | /* Initialize option structure to indicate that no values have been set. */ | |
311 | initialize_options(&options); | |
312 | ||
313 | /* Parse command-line arguments. */ | |
314 | host = NULL; | |
315 | ||
316 | again: | |
317 | while ((opt = getopt(ac, av, | |
318 | "1246ab:c:e:fgi:kl:m:no:p:qstvxACD:F:I:L:NPR:TVX")) != -1) { | |
319 | switch (opt) { | |
320 | case '1': | |
321 | options.protocol = SSH_PROTO_1; | |
322 | break; | |
323 | case '2': | |
324 | options.protocol = SSH_PROTO_2; | |
325 | break; | |
326 | case '4': | |
327 | IPv4or6 = AF_INET; | |
328 | break; | |
329 | case '6': | |
330 | IPv4or6 = AF_INET6; | |
331 | break; | |
332 | case 'n': | |
333 | stdin_null_flag = 1; | |
334 | break; | |
335 | case 'f': | |
336 | fork_after_authentication_flag = 1; | |
337 | stdin_null_flag = 1; | |
338 | break; | |
339 | case 'x': | |
340 | options.forward_x11 = 0; | |
341 | break; | |
342 | case 'X': | |
343 | options.forward_x11 = 1; | |
344 | break; | |
345 | case 'g': | |
346 | options.gateway_ports = 1; | |
347 | break; | |
348 | case 'P': | |
349 | options.use_privileged_port = 0; | |
350 | break; | |
351 | case 'a': | |
352 | options.forward_agent = 0; | |
353 | break; | |
354 | case 'A': | |
355 | options.forward_agent = 1; | |
356 | break; | |
357 | #ifdef AFS | |
358 | case 'k': | |
359 | options.kerberos_tgt_passing = 0; | |
360 | options.afs_token_passing = 0; | |
361 | break; | |
362 | #endif | |
363 | case 'i': | |
364 | if (stat(optarg, &st) < 0) { | |
365 | fprintf(stderr, "Warning: Identity file %s " | |
366 | "does not exist.\n", optarg); | |
367 | break; | |
368 | } | |
369 | if (options.num_identity_files >= | |
370 | SSH_MAX_IDENTITY_FILES) | |
371 | fatal("Too many identity files specified " | |
372 | "(max %d)", SSH_MAX_IDENTITY_FILES); | |
373 | options.identity_files[options.num_identity_files++] = | |
374 | xstrdup(optarg); | |
375 | break; | |
376 | case 'I': | |
377 | #ifdef SMARTCARD | |
378 | options.smartcard_device = xstrdup(optarg); | |
379 | #else | |
380 | fprintf(stderr, "no support for smartcards.\n"); | |
381 | #endif | |
382 | break; | |
383 | case 't': | |
384 | if (tty_flag) | |
385 | force_tty_flag = 1; | |
386 | tty_flag = 1; | |
387 | break; | |
388 | case 'v': | |
389 | if (0 == debug_flag) { | |
390 | debug_flag = 1; | |
391 | options.log_level = SYSLOG_LEVEL_DEBUG1; | |
392 | } else if (options.log_level < SYSLOG_LEVEL_DEBUG3) { | |
393 | options.log_level++; | |
394 | break; | |
395 | } else | |
396 | fatal("Too high debugging level."); | |
397 | /* fallthrough */ | |
398 | case 'V': | |
399 | fprintf(stderr, | |
400 | "%s, SSH protocols %d.%d/%d.%d, OpenSSL 0x%8.8lx\n", | |
401 | SSH_VERSION, | |
402 | PROTOCOL_MAJOR_1, PROTOCOL_MINOR_1, | |
403 | PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2, | |
404 | SSLeay()); | |
405 | if (opt == 'V') | |
406 | exit(0); | |
407 | break; | |
408 | case 'q': | |
409 | options.log_level = SYSLOG_LEVEL_QUIET; | |
410 | break; | |
411 | case 'e': | |
412 | if (optarg[0] == '^' && optarg[2] == 0 && | |
413 | (u_char) optarg[1] >= 64 && | |
414 | (u_char) optarg[1] < 128) | |
415 | options.escape_char = (u_char) optarg[1] & 31; | |
416 | else if (strlen(optarg) == 1) | |
417 | options.escape_char = (u_char) optarg[0]; | |
418 | else if (strcmp(optarg, "none") == 0) | |
419 | options.escape_char = SSH_ESCAPECHAR_NONE; | |
420 | else { | |
421 | fprintf(stderr, "Bad escape character '%s'.\n", | |
422 | optarg); | |
423 | exit(1); | |
424 | } | |
425 | break; | |
426 | case 'c': | |
427 | if (ciphers_valid(optarg)) { | |
428 | /* SSH2 only */ | |
429 | options.ciphers = xstrdup(optarg); | |
430 | options.cipher = SSH_CIPHER_ILLEGAL; | |
431 | } else { | |
432 | /* SSH1 only */ | |
433 | options.cipher = cipher_number(optarg); | |
434 | if (options.cipher == -1) { | |
435 | fprintf(stderr, | |
436 | "Unknown cipher type '%s'\n", | |
437 | optarg); | |
438 | exit(1); | |
439 | } | |
440 | if (options.cipher == SSH_CIPHER_3DES) | |
441 | options.ciphers = "3des-cbc"; | |
442 | else if (options.cipher == SSH_CIPHER_BLOWFISH) | |
443 | options.ciphers = "blowfish-cbc"; | |
444 | else | |
445 | options.ciphers = (char *)-1; | |
446 | } | |
447 | break; | |
448 | case 'm': | |
449 | if (mac_valid(optarg)) | |
450 | options.macs = xstrdup(optarg); | |
451 | else { | |
452 | fprintf(stderr, "Unknown mac type '%s'\n", | |
453 | optarg); | |
454 | exit(1); | |
455 | } | |
456 | break; | |
457 | case 'p': | |
458 | options.port = a2port(optarg); | |
459 | if (options.port == 0) { | |
460 | fprintf(stderr, "Bad port '%s'\n", optarg); | |
461 | exit(1); | |
462 | } | |
463 | break; | |
464 | case 'l': | |
465 | options.user = optarg; | |
466 | break; | |
467 | ||
468 | case 'L': | |
469 | case 'R': | |
470 | if (sscanf(optarg, "%5[0-9]:%255[^:]:%5[0-9]", | |
471 | sfwd_port, buf, sfwd_host_port) != 3 && | |
472 | sscanf(optarg, "%5[0-9]/%255[^/]/%5[0-9]", | |
473 | sfwd_port, buf, sfwd_host_port) != 3) { | |
474 | fprintf(stderr, | |
475 | "Bad forwarding specification '%s'\n", | |
476 | optarg); | |
477 | usage(); | |
478 | /* NOTREACHED */ | |
479 | } | |
480 | if ((fwd_port = a2port(sfwd_port)) == 0 || | |
481 | (fwd_host_port = a2port(sfwd_host_port)) == 0) { | |
482 | fprintf(stderr, | |
483 | "Bad forwarding port(s) '%s'\n", optarg); | |
484 | exit(1); | |
485 | } | |
486 | if (opt == 'L') | |
487 | add_local_forward(&options, fwd_port, buf, | |
488 | fwd_host_port); | |
489 | else if (opt == 'R') | |
490 | add_remote_forward(&options, fwd_port, buf, | |
491 | fwd_host_port); | |
492 | break; | |
493 | ||
494 | case 'D': | |
495 | fwd_port = a2port(optarg); | |
496 | if (fwd_port == 0) { | |
497 | fprintf(stderr, "Bad dynamic port '%s'\n", | |
498 | optarg); | |
499 | exit(1); | |
500 | } | |
501 | add_local_forward(&options, fwd_port, "socks4", 0); | |
502 | break; | |
503 | ||
504 | case 'C': | |
505 | options.compression = 1; | |
506 | break; | |
507 | case 'N': | |
508 | no_shell_flag = 1; | |
509 | no_tty_flag = 1; | |
510 | break; | |
511 | case 'T': | |
512 | no_tty_flag = 1; | |
513 | break; | |
514 | case 'o': | |
515 | dummy = 1; | |
516 | if (process_config_line(&options, host ? host : "", | |
517 | optarg, "command-line", 0, &dummy) != 0) | |
518 | exit(1); | |
519 | break; | |
520 | case 's': | |
521 | subsystem_flag = 1; | |
522 | break; | |
523 | case 'b': | |
524 | options.bind_address = optarg; | |
525 | break; | |
526 | case 'F': | |
527 | config = optarg; | |
528 | break; | |
529 | default: | |
530 | usage(); | |
531 | } | |
532 | } | |
533 | ||
534 | ac -= optind; | |
535 | av += optind; | |
536 | ||
537 | if (ac > 0 && !host && **av != '-') { | |
538 | if (strchr(*av, '@')) { | |
539 | p = xstrdup(*av); | |
540 | cp = strchr(p, '@'); | |
541 | if (cp == NULL || cp == p) | |
542 | usage(); | |
543 | options.user = p; | |
544 | *cp = '\0'; | |
545 | host = ++cp; | |
546 | } else | |
547 | host = *av; | |
548 | ac--, av++; | |
549 | if (ac > 0) { | |
550 | optind = 0; | |
551 | optreset = 1; | |
552 | goto again; | |
553 | } | |
554 | } | |
555 | ||
556 | /* Check that we got a host name. */ | |
557 | if (!host) | |
558 | usage(); | |
559 | ||
560 | SSLeay_add_all_algorithms(); | |
561 | ERR_load_crypto_strings(); | |
562 | channel_set_af(IPv4or6); | |
563 | ||
564 | /* Initialize the command to execute on remote host. */ | |
565 | buffer_init(&command); | |
566 | ||
567 | /* | |
568 | * Save the command to execute on the remote host in a buffer. There | |
569 | * is no limit on the length of the command, except by the maximum | |
570 | * packet size. Also sets the tty flag if there is no command. | |
571 | */ | |
572 | if (!ac) { | |
573 | /* No command specified - execute shell on a tty. */ | |
574 | tty_flag = 1; | |
575 | if (subsystem_flag) { | |
576 | fprintf(stderr, | |
577 | "You must specify a subsystem to invoke.\n"); | |
578 | usage(); | |
579 | } | |
580 | } else { | |
581 | /* A command has been specified. Store it into the buffer. */ | |
582 | for (i = 0; i < ac; i++) { | |
583 | if (i) | |
584 | buffer_append(&command, " ", 1); | |
585 | buffer_append(&command, av[i], strlen(av[i])); | |
586 | } | |
587 | } | |
588 | ||
589 | /* Cannot fork to background if no command. */ | |
590 | if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag) | |
591 | fatal("Cannot fork into background without a command to execute."); | |
592 | ||
593 | /* Allocate a tty by default if no command specified. */ | |
594 | if (buffer_len(&command) == 0) | |
595 | tty_flag = 1; | |
596 | ||
597 | /* Force no tty*/ | |
598 | if (no_tty_flag) | |
599 | tty_flag = 0; | |
600 | /* Do not allocate a tty if stdin is not a tty. */ | |
601 | if (!isatty(fileno(stdin)) && !force_tty_flag) { | |
602 | if (tty_flag) | |
603 | log("Pseudo-terminal will not be allocated because stdin is not a terminal."); | |
604 | tty_flag = 0; | |
605 | } | |
606 | ||
607 | /* | |
608 | * Initialize "log" output. Since we are the client all output | |
609 | * actually goes to stderr. | |
610 | */ | |
611 | log_init(av[0], options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level, | |
612 | SYSLOG_FACILITY_USER, 1); | |
613 | ||
614 | /* | |
615 | * Read per-user configuration file. Ignore the system wide config | |
616 | * file if the user specifies a config file on the command line. | |
617 | */ | |
618 | if (config != NULL) { | |
619 | if (!read_config_file(config, host, &options)) | |
620 | fatal("Can't open user config file %.100s: " | |
621 | "%.100s", config, strerror(errno)); | |
622 | } else { | |
623 | snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, | |
624 | _PATH_SSH_USER_CONFFILE); | |
625 | (void)read_config_file(buf, host, &options); | |
626 | ||
627 | /* Read systemwide configuration file after use config. */ | |
628 | (void)read_config_file(_PATH_HOST_CONFIG_FILE, host, &options); | |
629 | } | |
630 | ||
631 | /* Fill configuration defaults. */ | |
632 | fill_default_options(&options); | |
633 | ||
634 | /* reinit */ | |
635 | log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 1); | |
636 | ||
637 | seed_rng(); | |
638 | ||
639 | if (options.user == NULL) | |
640 | options.user = xstrdup(pw->pw_name); | |
641 | ||
642 | if (options.hostname != NULL) | |
643 | host = options.hostname; | |
644 | ||
645 | /* Disable rhosts authentication if not running as root. */ | |
646 | #ifdef HAVE_CYGWIN | |
647 | /* Ignore uid if running under Windows */ | |
648 | if (!options.use_privileged_port) { | |
649 | #else | |
650 | if (original_effective_uid != 0 || !options.use_privileged_port) { | |
651 | #endif | |
652 | debug("Rhosts Authentication disabled, " | |
653 | "originating port will not be trusted."); | |
654 | options.rhosts_authentication = 0; | |
655 | } | |
656 | /* | |
657 | * If using rsh has been selected, exec it now (without trying | |
658 | * anything else). Note that we must release privileges first. | |
659 | */ | |
660 | if (options.use_rsh) { | |
661 | /* | |
662 | * Restore our superuser privileges. This must be done | |
663 | * before permanently setting the uid. | |
664 | */ | |
665 | restore_uid(); | |
666 | ||
667 | /* Switch to the original uid permanently. */ | |
668 | permanently_set_uid(pw); | |
669 | ||
670 | /* Execute rsh. */ | |
671 | rsh_connect(host, options.user, &command); | |
672 | fatal("rsh_connect returned"); | |
673 | } | |
674 | /* Restore our superuser privileges. */ | |
675 | restore_uid(); | |
676 | ||
677 | /* Open a connection to the remote host. */ | |
678 | ||
679 | cerr = ssh_connect(host, &hostaddr, options.port, IPv4or6, | |
680 | options.connection_attempts, | |
681 | original_effective_uid != 0 || !options.use_privileged_port, | |
682 | pw, options.proxy_command); | |
683 | ||
684 | /* | |
685 | * If we successfully made the connection, load the host private key | |
686 | * in case we will need it later for combined rsa-rhosts | |
687 | * authentication. This must be done before releasing extra | |
688 | * privileges, because the file is only readable by root. | |
689 | */ | |
690 | sensitive_data.nkeys = 0; | |
691 | sensitive_data.keys = NULL; | |
692 | if (!cerr && (options.rhosts_rsa_authentication || | |
693 | options.hostbased_authentication)) { | |
694 | sensitive_data.nkeys = 3; | |
695 | sensitive_data.keys = xmalloc(sensitive_data.nkeys*sizeof(Key)); | |
696 | sensitive_data.keys[0] = key_load_private_type(KEY_RSA1, | |
697 | _PATH_HOST_KEY_FILE, "", NULL); | |
698 | sensitive_data.keys[1] = key_load_private_type(KEY_DSA, | |
699 | _PATH_HOST_DSA_KEY_FILE, "", NULL); | |
700 | sensitive_data.keys[2] = key_load_private_type(KEY_RSA, | |
701 | _PATH_HOST_RSA_KEY_FILE, "", NULL); | |
702 | } | |
703 | /* | |
704 | * Get rid of any extra privileges that we may have. We will no | |
705 | * longer need them. Also, extra privileges could make it very hard | |
706 | * to read identity files and other non-world-readable files from the | |
707 | * user's home directory if it happens to be on a NFS volume where | |
708 | * root is mapped to nobody. | |
709 | */ | |
710 | ||
711 | /* | |
712 | * Note that some legacy systems need to postpone the following call | |
713 | * to permanently_set_uid() until the private hostkey is destroyed | |
714 | * with RSA_free(). Otherwise the calling user could ptrace() the | |
715 | * process, read the private hostkey and impersonate the host. | |
716 | * OpenBSD does not allow ptracing of setuid processes. | |
717 | */ | |
718 | permanently_set_uid(pw); | |
719 | ||
720 | /* | |
721 | * Now that we are back to our own permissions, create ~/.ssh | |
722 | * directory if it doesn\'t already exist. | |
723 | */ | |
724 | snprintf(buf, sizeof buf, "%.100s%s%.100s", pw->pw_dir, strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR); | |
725 | if (stat(buf, &st) < 0) | |
726 | if (mkdir(buf, 0700) < 0) | |
727 | error("Could not create directory '%.200s'.", buf); | |
728 | ||
729 | /* Check if the connection failed, and try "rsh" if appropriate. */ | |
730 | if (cerr) { | |
731 | if (!options.fallback_to_rsh) | |
732 | exit(1); | |
733 | if (options.port != 0) | |
734 | log("Secure connection to %.100s on port %hu refused; " | |
735 | "reverting to insecure method", | |
736 | host, options.port); | |
737 | else | |
738 | log("Secure connection to %.100s refused; " | |
739 | "reverting to insecure method.", host); | |
740 | ||
741 | rsh_connect(host, options.user, &command); | |
742 | fatal("rsh_connect returned"); | |
743 | } | |
744 | /* load options.identity_files */ | |
745 | load_public_identity_files(); | |
746 | ||
747 | /* Expand ~ in known host file names. */ | |
748 | /* XXX mem-leaks: */ | |
749 | options.system_hostfile = | |
750 | tilde_expand_filename(options.system_hostfile, original_real_uid); | |
751 | options.user_hostfile = | |
752 | tilde_expand_filename(options.user_hostfile, original_real_uid); | |
753 | options.system_hostfile2 = | |
754 | tilde_expand_filename(options.system_hostfile2, original_real_uid); | |
755 | options.user_hostfile2 = | |
756 | tilde_expand_filename(options.user_hostfile2, original_real_uid); | |
757 | ||
758 | signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */ | |
759 | ||
760 | /* Log into the remote system. This never returns if the login fails. */ | |
761 | ssh_login(sensitive_data.keys, sensitive_data.nkeys, | |
762 | host, (struct sockaddr *)&hostaddr, pw); | |
763 | ||
764 | /* We no longer need the private host keys. Clear them now. */ | |
765 | if (sensitive_data.nkeys != 0) { | |
766 | for (i = 0; i < sensitive_data.nkeys; i++) { | |
767 | if (sensitive_data.keys[i] != NULL) { | |
768 | /* Destroys contents safely */ | |
769 | debug3("clear hostkey %d", i); | |
770 | key_free(sensitive_data.keys[i]); | |
771 | sensitive_data.keys[i] = NULL; | |
772 | } | |
773 | } | |
774 | xfree(sensitive_data.keys); | |
775 | } | |
776 | for (i = 0; i < options.num_identity_files; i++) { | |
777 | if (options.identity_files[i]) { | |
778 | xfree(options.identity_files[i]); | |
779 | options.identity_files[i] = NULL; | |
780 | } | |
781 | if (options.identity_keys[i]) { | |
782 | key_free(options.identity_keys[i]); | |
783 | options.identity_keys[i] = NULL; | |
784 | } | |
785 | } | |
786 | ||
787 | exit_status = compat20 ? ssh_session2() : ssh_session(); | |
788 | packet_close(); | |
789 | return exit_status; | |
790 | } | |
791 | ||
792 | static void | |
793 | x11_get_proto(char **_proto, char **_data) | |
794 | { | |
795 | char line[512]; | |
796 | static char proto[512], data[512]; | |
797 | FILE *f; | |
798 | int got_data = 0, i; | |
799 | char *display; | |
800 | ||
801 | *_proto = proto; | |
802 | *_data = data; | |
803 | proto[0] = data[0] = '\0'; | |
804 | if (options.xauth_location && (display = getenv("DISPLAY"))) { | |
805 | /* Try to get Xauthority information for the display. */ | |
806 | if (strncmp(display, "localhost:", 10) == 0) | |
807 | /* | |
808 | * Handle FamilyLocal case where $DISPLAY does | |
809 | * not match an authorization entry. For this we | |
810 | * just try "xauth list unix:displaynum.screennum". | |
811 | * XXX: "localhost" match to determine FamilyLocal | |
812 | * is not perfect. | |
813 | */ | |
814 | snprintf(line, sizeof line, "%s list unix:%s 2>" | |
815 | _PATH_DEVNULL, options.xauth_location, display+10); | |
816 | else | |
817 | snprintf(line, sizeof line, "%s list %.200s 2>" | |
818 | _PATH_DEVNULL, options.xauth_location, display); | |
819 | debug2("x11_get_proto %s", line); | |
820 | f = popen(line, "r"); | |
821 | if (f && fgets(line, sizeof(line), f) && | |
822 | sscanf(line, "%*s %511s %511s", proto, data) == 2) | |
823 | got_data = 1; | |
824 | if (f) | |
825 | pclose(f); | |
826 | } | |
827 | /* | |
828 | * If we didn't get authentication data, just make up some | |
829 | * data. The forwarding code will check the validity of the | |
830 | * response anyway, and substitute this data. The X11 | |
831 | * server, however, will ignore this fake data and use | |
832 | * whatever authentication mechanisms it was using otherwise | |
833 | * for the local connection. | |
834 | */ | |
835 | if (!got_data) { | |
836 | u_int32_t rand = 0; | |
837 | ||
838 | strlcpy(proto, "MIT-MAGIC-COOKIE-1", sizeof proto); | |
839 | for (i = 0; i < 16; i++) { | |
840 | if (i % 4 == 0) | |
841 | rand = arc4random(); | |
842 | snprintf(data + 2 * i, sizeof data - 2 * i, "%02x", rand & 0xff); | |
843 | rand >>= 8; | |
844 | } | |
845 | } | |
846 | } | |
847 | ||
848 | static void | |
849 | ssh_init_forwarding(void) | |
850 | { | |
851 | int success = 0; | |
852 | int i; | |
853 | ||
854 | /* Initiate local TCP/IP port forwardings. */ | |
855 | for (i = 0; i < options.num_local_forwards; i++) { | |
856 | debug("Connections to local port %d forwarded to remote address %.200s:%d", | |
857 | options.local_forwards[i].port, | |
858 | options.local_forwards[i].host, | |
859 | options.local_forwards[i].host_port); | |
860 | success += channel_setup_local_fwd_listener( | |
861 | options.local_forwards[i].port, | |
862 | options.local_forwards[i].host, | |
863 | options.local_forwards[i].host_port, | |
864 | options.gateway_ports); | |
865 | } | |
866 | if (i > 0 && success == 0) | |
867 | error("Could not request local forwarding."); | |
868 | ||
869 | /* Initiate remote TCP/IP port forwardings. */ | |
870 | for (i = 0; i < options.num_remote_forwards; i++) { | |
871 | debug("Connections to remote port %d forwarded to local address %.200s:%d", | |
872 | options.remote_forwards[i].port, | |
873 | options.remote_forwards[i].host, | |
874 | options.remote_forwards[i].host_port); | |
875 | channel_request_remote_forwarding( | |
876 | options.remote_forwards[i].port, | |
877 | options.remote_forwards[i].host, | |
878 | options.remote_forwards[i].host_port); | |
879 | } | |
880 | } | |
881 | ||
882 | static void | |
883 | check_agent_present(void) | |
884 | { | |
885 | if (options.forward_agent) { | |
886 | /* Clear agent forwarding if we don\'t have an agent. */ | |
887 | int authfd = ssh_get_authentication_socket(); | |
888 | if (authfd < 0) | |
889 | options.forward_agent = 0; | |
890 | else | |
891 | ssh_close_authentication_socket(authfd); | |
892 | } | |
893 | } | |
894 | ||
895 | static int | |
896 | ssh_session(void) | |
897 | { | |
898 | int type; | |
899 | int interactive = 0; | |
900 | int have_tty = 0; | |
901 | struct winsize ws; | |
902 | char *cp; | |
903 | ||
904 | /* Enable compression if requested. */ | |
905 | if (options.compression) { | |
906 | debug("Requesting compression at level %d.", options.compression_level); | |
907 | ||
908 | if (options.compression_level < 1 || options.compression_level > 9) | |
909 | fatal("Compression level must be from 1 (fast) to 9 (slow, best)."); | |
910 | ||
911 | /* Send the request. */ | |
912 | packet_start(SSH_CMSG_REQUEST_COMPRESSION); | |
913 | packet_put_int(options.compression_level); | |
914 | packet_send(); | |
915 | packet_write_wait(); | |
916 | type = packet_read(); | |
917 | if (type == SSH_SMSG_SUCCESS) | |
918 | packet_start_compression(options.compression_level); | |
919 | else if (type == SSH_SMSG_FAILURE) | |
920 | log("Warning: Remote host refused compression."); | |
921 | else | |
922 | packet_disconnect("Protocol error waiting for compression response."); | |
923 | } | |
924 | /* Allocate a pseudo tty if appropriate. */ | |
925 | if (tty_flag) { | |
926 | debug("Requesting pty."); | |
927 | ||
928 | /* Start the packet. */ | |
929 | packet_start(SSH_CMSG_REQUEST_PTY); | |
930 | ||
931 | /* Store TERM in the packet. There is no limit on the | |
932 | length of the string. */ | |
933 | cp = getenv("TERM"); | |
934 | if (!cp) | |
935 | cp = ""; | |
936 | packet_put_cstring(cp); | |
937 | ||
938 | /* Store window size in the packet. */ | |
939 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) | |
940 | memset(&ws, 0, sizeof(ws)); | |
941 | packet_put_int(ws.ws_row); | |
942 | packet_put_int(ws.ws_col); | |
943 | packet_put_int(ws.ws_xpixel); | |
944 | packet_put_int(ws.ws_ypixel); | |
945 | ||
946 | /* Store tty modes in the packet. */ | |
947 | tty_make_modes(fileno(stdin), NULL); | |
948 | ||
949 | /* Send the packet, and wait for it to leave. */ | |
950 | packet_send(); | |
951 | packet_write_wait(); | |
952 | ||
953 | /* Read response from the server. */ | |
954 | type = packet_read(); | |
955 | if (type == SSH_SMSG_SUCCESS) { | |
956 | interactive = 1; | |
957 | have_tty = 1; | |
958 | } else if (type == SSH_SMSG_FAILURE) | |
959 | log("Warning: Remote host failed or refused to allocate a pseudo tty."); | |
960 | else | |
961 | packet_disconnect("Protocol error waiting for pty request response."); | |
962 | } | |
963 | /* Request X11 forwarding if enabled and DISPLAY is set. */ | |
964 | if (options.forward_x11 && getenv("DISPLAY") != NULL) { | |
965 | char *proto, *data; | |
966 | /* Get reasonable local authentication information. */ | |
967 | x11_get_proto(&proto, &data); | |
968 | /* Request forwarding with authentication spoofing. */ | |
969 | debug("Requesting X11 forwarding with authentication spoofing."); | |
970 | x11_request_forwarding_with_spoofing(0, proto, data); | |
971 | ||
972 | /* Read response from the server. */ | |
973 | type = packet_read(); | |
974 | if (type == SSH_SMSG_SUCCESS) { | |
975 | interactive = 1; | |
976 | } else if (type == SSH_SMSG_FAILURE) { | |
977 | log("Warning: Remote host denied X11 forwarding."); | |
978 | } else { | |
979 | packet_disconnect("Protocol error waiting for X11 forwarding"); | |
980 | } | |
981 | } | |
982 | /* Tell the packet module whether this is an interactive session. */ | |
983 | packet_set_interactive(interactive); | |
984 | ||
985 | /* Request authentication agent forwarding if appropriate. */ | |
986 | check_agent_present(); | |
987 | ||
988 | if (options.forward_agent) { | |
989 | debug("Requesting authentication agent forwarding."); | |
990 | auth_request_forwarding(); | |
991 | ||
992 | /* Read response from the server. */ | |
993 | type = packet_read(); | |
994 | packet_check_eom(); | |
995 | if (type != SSH_SMSG_SUCCESS) | |
996 | log("Warning: Remote host denied authentication agent forwarding."); | |
997 | } | |
998 | ||
999 | /* Initiate port forwardings. */ | |
1000 | ssh_init_forwarding(); | |
1001 | ||
1002 | /* If requested, let ssh continue in the background. */ | |
1003 | if (fork_after_authentication_flag) | |
1004 | if (daemon(1, 1) < 0) | |
1005 | fatal("daemon() failed: %.200s", strerror(errno)); | |
1006 | ||
1007 | /* | |
1008 | * If a command was specified on the command line, execute the | |
1009 | * command now. Otherwise request the server to start a shell. | |
1010 | */ | |
1011 | if (buffer_len(&command) > 0) { | |
1012 | int len = buffer_len(&command); | |
1013 | if (len > 900) | |
1014 | len = 900; | |
1015 | debug("Sending command: %.*s", len, (u_char *)buffer_ptr(&command)); | |
1016 | packet_start(SSH_CMSG_EXEC_CMD); | |
1017 | packet_put_string(buffer_ptr(&command), buffer_len(&command)); | |
1018 | packet_send(); | |
1019 | packet_write_wait(); | |
1020 | } else { | |
1021 | debug("Requesting shell."); | |
1022 | packet_start(SSH_CMSG_EXEC_SHELL); | |
1023 | packet_send(); | |
1024 | packet_write_wait(); | |
1025 | } | |
1026 | ||
1027 | /* Enter the interactive session. */ | |
1028 | return client_loop(have_tty, tty_flag ? | |
1029 | options.escape_char : SSH_ESCAPECHAR_NONE, 0); | |
1030 | } | |
1031 | ||
1032 | static void | |
1033 | client_subsystem_reply(int type, u_int32_t seq, void *ctxt) | |
1034 | { | |
1035 | int id, len; | |
1036 | ||
1037 | id = packet_get_int(); | |
1038 | len = buffer_len(&command); | |
1039 | if (len > 900) | |
1040 | len = 900; | |
1041 | packet_check_eom(); | |
1042 | if (type == SSH2_MSG_CHANNEL_FAILURE) | |
1043 | fatal("Request for subsystem '%.*s' failed on channel %d", | |
1044 | len, (u_char *)buffer_ptr(&command), id); | |
1045 | } | |
1046 | ||
1047 | void | |
1048 | client_global_request_reply(int type, u_int32_t seq, void *ctxt) | |
1049 | { | |
1050 | int i; | |
1051 | ||
1052 | i = client_global_request_id++; | |
1053 | if (i >= options.num_remote_forwards) { | |
1054 | debug("client_global_request_reply: too many replies %d > %d", | |
1055 | i, options.num_remote_forwards); | |
1056 | return; | |
1057 | } | |
1058 | debug("remote forward %s for: listen %d, connect %s:%d", | |
1059 | type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure", | |
1060 | options.remote_forwards[i].port, | |
1061 | options.remote_forwards[i].host, | |
1062 | options.remote_forwards[i].host_port); | |
1063 | if (type == SSH2_MSG_REQUEST_FAILURE) | |
1064 | log("Warning: remote port forwarding failed for listen port %d", | |
1065 | options.remote_forwards[i].port); | |
1066 | } | |
1067 | ||
1068 | /* request pty/x11/agent/tcpfwd/shell for channel */ | |
1069 | static void | |
1070 | ssh_session2_setup(int id, void *arg) | |
1071 | { | |
1072 | int len; | |
1073 | int interactive = 0; | |
1074 | struct termios tio; | |
1075 | ||
1076 | debug("ssh_session2_setup: id %d", id); | |
1077 | ||
1078 | if (tty_flag) { | |
1079 | struct winsize ws; | |
1080 | char *cp; | |
1081 | cp = getenv("TERM"); | |
1082 | if (!cp) | |
1083 | cp = ""; | |
1084 | /* Store window size in the packet. */ | |
1085 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) | |
1086 | memset(&ws, 0, sizeof(ws)); | |
1087 | ||
1088 | channel_request_start(id, "pty-req", 0); | |
1089 | packet_put_cstring(cp); | |
1090 | packet_put_int(ws.ws_col); | |
1091 | packet_put_int(ws.ws_row); | |
1092 | packet_put_int(ws.ws_xpixel); | |
1093 | packet_put_int(ws.ws_ypixel); | |
1094 | tio = get_saved_tio(); | |
1095 | tty_make_modes(/*ignored*/ 0, &tio); | |
1096 | packet_send(); | |
1097 | interactive = 1; | |
1098 | /* XXX wait for reply */ | |
1099 | } | |
1100 | if (options.forward_x11 && | |
1101 | getenv("DISPLAY") != NULL) { | |
1102 | char *proto, *data; | |
1103 | /* Get reasonable local authentication information. */ | |
1104 | x11_get_proto(&proto, &data); | |
1105 | /* Request forwarding with authentication spoofing. */ | |
1106 | debug("Requesting X11 forwarding with authentication spoofing."); | |
1107 | x11_request_forwarding_with_spoofing(id, proto, data); | |
1108 | interactive = 1; | |
1109 | /* XXX wait for reply */ | |
1110 | } | |
1111 | ||
1112 | check_agent_present(); | |
1113 | if (options.forward_agent) { | |
1114 | debug("Requesting authentication agent forwarding."); | |
1115 | channel_request_start(id, "auth-agent-req@openssh.com", 0); | |
1116 | packet_send(); | |
1117 | } | |
1118 | ||
1119 | len = buffer_len(&command); | |
1120 | if (len > 0) { | |
1121 | if (len > 900) | |
1122 | len = 900; | |
1123 | if (subsystem_flag) { | |
1124 | debug("Sending subsystem: %.*s", len, (u_char *)buffer_ptr(&command)); | |
1125 | channel_request_start(id, "subsystem", /*want reply*/ 1); | |
1126 | /* register callback for reply */ | |
1127 | /* XXX we asume that client_loop has already been called */ | |
1128 | dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &client_subsystem_reply); | |
1129 | dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &client_subsystem_reply); | |
1130 | } else { | |
1131 | debug("Sending command: %.*s", len, (u_char *)buffer_ptr(&command)); | |
1132 | channel_request_start(id, "exec", 0); | |
1133 | } | |
1134 | packet_put_string(buffer_ptr(&command), buffer_len(&command)); | |
1135 | packet_send(); | |
1136 | } else { | |
1137 | channel_request_start(id, "shell", 0); | |
1138 | packet_send(); | |
1139 | } | |
1140 | ||
1141 | packet_set_interactive(interactive); | |
1142 | } | |
1143 | ||
1144 | /* open new channel for a session */ | |
1145 | static int | |
1146 | ssh_session2_open(void) | |
1147 | { | |
1148 | Channel *c; | |
1149 | int window, packetmax, in, out, err; | |
1150 | ||
1151 | if (stdin_null_flag) { | |
1152 | in = open(_PATH_DEVNULL, O_RDONLY); | |
1153 | } else { | |
1154 | in = dup(STDIN_FILENO); | |
1155 | } | |
1156 | out = dup(STDOUT_FILENO); | |
1157 | err = dup(STDERR_FILENO); | |
1158 | ||
1159 | if (in < 0 || out < 0 || err < 0) | |
1160 | fatal("dup() in/out/err failed"); | |
1161 | ||
1162 | /* enable nonblocking unless tty */ | |
1163 | if (!isatty(in)) | |
1164 | set_nonblock(in); | |
1165 | if (!isatty(out)) | |
1166 | set_nonblock(out); | |
1167 | if (!isatty(err)) | |
1168 | set_nonblock(err); | |
1169 | ||
1170 | window = CHAN_SES_WINDOW_DEFAULT; | |
1171 | packetmax = CHAN_SES_PACKET_DEFAULT; | |
1172 | if (tty_flag) { | |
1173 | window >>= 1; | |
1174 | packetmax >>= 1; | |
1175 | } | |
1176 | c = channel_new( | |
1177 | "session", SSH_CHANNEL_OPENING, in, out, err, | |
1178 | window, packetmax, CHAN_EXTENDED_WRITE, | |
1179 | xstrdup("client-session"), /*nonblock*/0); | |
1180 | ||
1181 | debug3("ssh_session2_open: channel_new: %d", c->self); | |
1182 | ||
1183 | channel_send_open(c->self); | |
1184 | if (!no_shell_flag) | |
1185 | channel_register_confirm(c->self, ssh_session2_setup); | |
1186 | ||
1187 | return c->self; | |
1188 | } | |
1189 | ||
1190 | static int | |
1191 | ssh_session2(void) | |
1192 | { | |
1193 | int id = -1; | |
1194 | ||
1195 | /* XXX should be pre-session */ | |
1196 | ssh_init_forwarding(); | |
1197 | ||
1198 | if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN)) | |
1199 | id = ssh_session2_open(); | |
1200 | ||
1201 | /* If requested, let ssh continue in the background. */ | |
1202 | if (fork_after_authentication_flag) | |
1203 | if (daemon(1, 1) < 0) | |
1204 | fatal("daemon() failed: %.200s", strerror(errno)); | |
1205 | ||
1206 | return client_loop(tty_flag, tty_flag ? | |
1207 | options.escape_char : SSH_ESCAPECHAR_NONE, id); | |
1208 | } | |
1209 | ||
1210 | static void | |
1211 | load_public_identity_files(void) | |
1212 | { | |
1213 | char *filename; | |
1214 | int i = 0; | |
1215 | Key *public; | |
1216 | #ifdef SMARTCARD | |
1217 | Key **keys; | |
1218 | ||
1219 | if (options.smartcard_device != NULL && | |
1220 | options.num_identity_files < SSH_MAX_IDENTITY_FILES && | |
1221 | (keys = sc_get_keys(options.smartcard_device, NULL)) != NULL ) { | |
1222 | int count = 0; | |
1223 | for (i = 0; keys[i] != NULL; i++) { | |
1224 | count++; | |
1225 | memmove(&options.identity_files[1], &options.identity_files[0], | |
1226 | sizeof(char *) * (SSH_MAX_IDENTITY_FILES - 1)); | |
1227 | memmove(&options.identity_keys[1], &options.identity_keys[0], | |
1228 | sizeof(Key *) * (SSH_MAX_IDENTITY_FILES - 1)); | |
1229 | options.num_identity_files++; | |
1230 | options.identity_keys[0] = keys[i]; | |
1231 | options.identity_files[0] = xstrdup("smartcard key");; | |
1232 | } | |
1233 | if (options.num_identity_files > SSH_MAX_IDENTITY_FILES) | |
1234 | options.num_identity_files = SSH_MAX_IDENTITY_FILES; | |
1235 | i = count; | |
1236 | xfree(keys); | |
1237 | } | |
1238 | #endif /* SMARTCARD */ | |
1239 | for (; i < options.num_identity_files; i++) { | |
1240 | filename = tilde_expand_filename(options.identity_files[i], | |
1241 | original_real_uid); | |
1242 | public = key_load_public(filename, NULL); | |
1243 | debug("identity file %s type %d", filename, | |
1244 | public ? public->type : -1); | |
1245 | xfree(options.identity_files[i]); | |
1246 | options.identity_files[i] = filename; | |
1247 | options.identity_keys[i] = public; | |
1248 | } | |
1249 | } |