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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. | |
416fd2a8 | 16 | * Copyright (c) 2000, 2001, 2002, 2003 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" | |
416fd2a8 | 43 | RCSID("$OpenBSD: ssh.c,v 1.206 2003/12/16 15:49:51 markus 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 | ||
3c0ef626 | 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 | |
ff2d7a98 | 101 | * so that the passphrase can be entered manually, and then ssh goes to the |
3c0ef626 | 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. */ | |
ff2d7a98 | 126 | Sensitive sensitive_data; |
3c0ef626 | 127 | |
128 | /* Original real UID. */ | |
129 | uid_t original_real_uid; | |
ff2d7a98 | 130 | uid_t original_effective_uid; |
3c0ef626 | 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 | ||
2980ea68 | 138 | /* # of replies received for global requests */ |
139 | static int client_global_request_id = 0; | |
140 | ||
e54b3d7c | 141 | /* pid of proxycommand child process */ |
142 | pid_t proxy_command_pid = 0; | |
143 | ||
3c0ef626 | 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"); | |
3c0ef626 | 157 | fprintf(stderr, " -X Enable X11 connection forwarding.\n"); |
416fd2a8 | 158 | fprintf(stderr, " -Y Enable trusted X11 connection forwarding.\n"); |
3c0ef626 | 159 | fprintf(stderr, " -x Disable X11 connection forwarding (default).\n"); |
160 | fprintf(stderr, " -i file Identity for public key authentication " | |
161 | "(default: ~/.ssh/identity)\n"); | |
162 | #ifdef SMARTCARD | |
163 | fprintf(stderr, " -I reader Set smartcard reader.\n"); | |
164 | #endif | |
165 | fprintf(stderr, " -t Tty; allocate a tty even if command is given.\n"); | |
166 | fprintf(stderr, " -T Do not allocate a tty.\n"); | |
167 | fprintf(stderr, " -v Verbose; display verbose debugging messages.\n"); | |
168 | fprintf(stderr, " Multiple -v increases verbosity.\n"); | |
169 | fprintf(stderr, " -V Display version number only.\n"); | |
3c0ef626 | 170 | fprintf(stderr, " -q Quiet; don't display any warning messages.\n"); |
171 | fprintf(stderr, " -f Fork into background after authentication.\n"); | |
172 | fprintf(stderr, " -e char Set escape character; ``none'' = disable (default: ~).\n"); | |
173 | ||
174 | fprintf(stderr, " -c cipher Select encryption algorithm\n"); | |
175 | fprintf(stderr, " -m macs Specify MAC algorithms for protocol version 2.\n"); | |
176 | fprintf(stderr, " -p port Connect to this port. Server must be on the same port.\n"); | |
177 | fprintf(stderr, " -L listen-port:host:port Forward local port to remote address\n"); | |
178 | fprintf(stderr, " -R listen-port:host:port Forward remote port to local address\n"); | |
179 | fprintf(stderr, " These cause %s to listen for connections on a port, and\n", __progname); | |
180 | fprintf(stderr, " forward them to the other side by connecting to host:port.\n"); | |
181 | fprintf(stderr, " -D port Enable dynamic application-level port forwarding.\n"); | |
182 | fprintf(stderr, " -C Enable compression.\n"); | |
183 | fprintf(stderr, " -N Do not execute a shell or command.\n"); | |
184 | fprintf(stderr, " -g Allow remote hosts to connect to forwarded ports.\n"); | |
185 | fprintf(stderr, " -1 Force protocol version 1.\n"); | |
186 | fprintf(stderr, " -2 Force protocol version 2.\n"); | |
187 | fprintf(stderr, " -4 Use IPv4 only.\n"); | |
188 | fprintf(stderr, " -6 Use IPv6 only.\n"); | |
189 | fprintf(stderr, " -o 'option' Process the option as if it was read from a configuration file.\n"); | |
190 | fprintf(stderr, " -s Invoke command (mandatory) as SSH2 subsystem.\n"); | |
191 | fprintf(stderr, " -b addr Local IP address.\n"); | |
192 | exit(1); | |
193 | } | |
194 | ||
3c0ef626 | 195 | static int ssh_session(void); |
196 | static int ssh_session2(void); | |
197 | static void load_public_identity_files(void); | |
198 | ||
199 | /* | |
200 | * Main program for the ssh client. | |
201 | */ | |
202 | int | |
203 | main(int ac, char **av) | |
204 | { | |
ff2d7a98 | 205 | int i, opt, exit_status; |
3c0ef626 | 206 | u_short fwd_port, fwd_host_port; |
207 | char sfwd_port[6], sfwd_host_port[6]; | |
416fd2a8 | 208 | char *p, *cp, *line, buf[256]; |
3c0ef626 | 209 | struct stat st; |
210 | struct passwd *pw; | |
211 | int dummy; | |
3c0ef626 | 212 | extern int optind, optreset; |
213 | extern char *optarg; | |
214 | ||
70791e56 | 215 | __progname = ssh_get_progname(av[0]); |
ae43c103 | 216 | init_pathnames(); |
3c0ef626 | 217 | init_rng(); |
218 | ||
219 | /* | |
220 | * Save the original real uid. It will be needed later (uid-swapping | |
221 | * may clobber the real uid). | |
222 | */ | |
223 | original_real_uid = getuid(); | |
224 | original_effective_uid = geteuid(); | |
416fd2a8 | 225 | |
e54b3d7c | 226 | /* |
227 | * Use uid-swapping to give up root privileges for the duration of | |
228 | * option processing. We will re-instantiate the rights when we are | |
229 | * ready to create the privileged port, and will permanently drop | |
230 | * them when the port has been created (actually, when the connection | |
231 | * has been made, as we may need to create the port several times). | |
232 | */ | |
233 | PRIV_END; | |
3c0ef626 | 234 | |
235 | #ifdef HAVE_SETRLIMIT | |
236 | /* If we are installed setuid root be careful to not drop core. */ | |
237 | if (original_real_uid != original_effective_uid) { | |
238 | struct rlimit rlim; | |
239 | rlim.rlim_cur = rlim.rlim_max = 0; | |
240 | if (setrlimit(RLIMIT_CORE, &rlim) < 0) | |
241 | fatal("setrlimit failed: %.100s", strerror(errno)); | |
242 | } | |
243 | #endif | |
244 | /* Get user data. */ | |
245 | pw = getpwuid(original_real_uid); | |
246 | if (!pw) { | |
70791e56 | 247 | logit("You don't exist, go away!"); |
3c0ef626 | 248 | exit(1); |
249 | } | |
250 | /* Take a copy of the returned structure. */ | |
251 | pw = pwcopy(pw); | |
252 | ||
3c0ef626 | 253 | /* |
254 | * Set our umask to something reasonable, as some files are created | |
255 | * with the default umask. This will make them world-readable but | |
256 | * writable only by the owner, which is ok for all files for which we | |
257 | * don't set the modes explicitly. | |
258 | */ | |
259 | umask(022); | |
260 | ||
261 | /* Initialize option structure to indicate that no values have been set. */ | |
262 | initialize_options(&options); | |
263 | ||
264 | /* Parse command-line arguments. */ | |
265 | host = NULL; | |
266 | ||
267 | again: | |
268 | while ((opt = getopt(ac, av, | |
416fd2a8 | 269 | "1246ab:c:e:fgi:kl:m:no:p:qstvxACD:F:I:L:NPR:TVXY")) != -1) { |
3c0ef626 | 270 | switch (opt) { |
271 | case '1': | |
272 | options.protocol = SSH_PROTO_1; | |
273 | break; | |
274 | case '2': | |
275 | options.protocol = SSH_PROTO_2; | |
276 | break; | |
277 | case '4': | |
70791e56 | 278 | options.address_family = AF_INET; |
3c0ef626 | 279 | break; |
280 | case '6': | |
70791e56 | 281 | options.address_family = AF_INET6; |
3c0ef626 | 282 | break; |
283 | case 'n': | |
284 | stdin_null_flag = 1; | |
285 | break; | |
286 | case 'f': | |
287 | fork_after_authentication_flag = 1; | |
288 | stdin_null_flag = 1; | |
289 | break; | |
290 | case 'x': | |
291 | options.forward_x11 = 0; | |
292 | break; | |
293 | case 'X': | |
294 | options.forward_x11 = 1; | |
295 | break; | |
416fd2a8 | 296 | case 'Y': |
297 | options.forward_x11 = 1; | |
298 | options.forward_x11_trusted = 1; | |
299 | break; | |
3c0ef626 | 300 | case 'g': |
301 | options.gateway_ports = 1; | |
302 | break; | |
e54b3d7c | 303 | case 'P': /* deprecated */ |
3c0ef626 | 304 | options.use_privileged_port = 0; |
305 | break; | |
306 | case 'a': | |
307 | options.forward_agent = 0; | |
308 | break; | |
309 | case 'A': | |
310 | options.forward_agent = 1; | |
311 | break; | |
3c0ef626 | 312 | case 'k': |
416fd2a8 | 313 | options.gss_deleg_creds = 0; |
3c0ef626 | 314 | break; |
3c0ef626 | 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': | |
70791e56 | 341 | if (debug_flag == 0) { |
3c0ef626 | 342 | debug_flag = 1; |
343 | options.log_level = SYSLOG_LEVEL_DEBUG1; | |
70791e56 | 344 | } else { |
345 | if (options.log_level < SYSLOG_LEVEL_DEBUG3) | |
346 | options.log_level++; | |
3c0ef626 | 347 | break; |
70791e56 | 348 | } |
3c0ef626 | 349 | /* fallthrough */ |
350 | case 'V': | |
351 | fprintf(stderr, | |
70791e56 | 352 | "%s, SSH protocols %d.%d/%d.%d, %s\n", |
3c0ef626 | 353 | SSH_VERSION, |
354 | PROTOCOL_MAJOR_1, PROTOCOL_MINOR_1, | |
355 | PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2, | |
70791e56 | 356 | SSLeay_version(SSLEAY_VERSION)); |
3c0ef626 | 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': | |
70791e56 | 422 | if (sscanf(optarg, "%5[0123456789]:%255[^:]:%5[0123456789]", |
3c0ef626 | 423 | sfwd_port, buf, sfwd_host_port) != 3 && |
70791e56 | 424 | sscanf(optarg, "%5[0123456789]/%255[^/]/%5[0123456789]", |
3c0ef626 | 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 || | |
2980ea68 | 433 | (fwd_host_port = a2port(sfwd_host_port)) == 0) { |
3c0ef626 | 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, | |
e9a17296 | 443 | fwd_host_port); |
3c0ef626 | 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 | } | |
70791e56 | 453 | add_local_forward(&options, fwd_port, "socks", 0); |
3c0ef626 | 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; | |
416fd2a8 | 468 | line = xstrdup(optarg); |
3c0ef626 | 469 | if (process_config_line(&options, host ? host : "", |
416fd2a8 | 470 | line, "command-line", 0, &dummy) != 0) |
3c0ef626 | 471 | exit(1); |
416fd2a8 | 472 | xfree(line); |
3c0ef626 | 473 | break; |
474 | case 's': | |
475 | subsystem_flag = 1; | |
476 | break; | |
477 | case 'b': | |
478 | options.bind_address = optarg; | |
479 | break; | |
480 | case 'F': | |
481 | config = optarg; | |
482 | break; | |
483 | default: | |
484 | usage(); | |
485 | } | |
486 | } | |
487 | ||
488 | ac -= optind; | |
489 | av += optind; | |
490 | ||
491 | if (ac > 0 && !host && **av != '-') { | |
1c14df9e | 492 | if (strrchr(*av, '@')) { |
3c0ef626 | 493 | p = xstrdup(*av); |
1c14df9e | 494 | cp = strrchr(p, '@'); |
3c0ef626 | 495 | if (cp == NULL || cp == p) |
496 | usage(); | |
497 | options.user = p; | |
498 | *cp = '\0'; | |
499 | host = ++cp; | |
500 | } else | |
501 | host = *av; | |
1c14df9e | 502 | if (ac > 1) { |
503 | optind = optreset = 1; | |
3c0ef626 | 504 | goto again; |
505 | } | |
1c14df9e | 506 | ac--, av++; |
3c0ef626 | 507 | } |
508 | ||
509 | /* Check that we got a host name. */ | |
510 | if (!host) | |
511 | usage(); | |
512 | ||
513 | SSLeay_add_all_algorithms(); | |
514 | ERR_load_crypto_strings(); | |
3c0ef626 | 515 | |
516 | /* Initialize the command to execute on remote host. */ | |
517 | buffer_init(&command); | |
518 | ||
519 | /* | |
520 | * Save the command to execute on the remote host in a buffer. There | |
521 | * is no limit on the length of the command, except by the maximum | |
522 | * packet size. Also sets the tty flag if there is no command. | |
523 | */ | |
524 | if (!ac) { | |
525 | /* No command specified - execute shell on a tty. */ | |
526 | tty_flag = 1; | |
527 | if (subsystem_flag) { | |
528 | fprintf(stderr, | |
529 | "You must specify a subsystem to invoke.\n"); | |
530 | usage(); | |
531 | } | |
532 | } else { | |
533 | /* A command has been specified. Store it into the buffer. */ | |
534 | for (i = 0; i < ac; i++) { | |
535 | if (i) | |
536 | buffer_append(&command, " ", 1); | |
537 | buffer_append(&command, av[i], strlen(av[i])); | |
538 | } | |
539 | } | |
540 | ||
541 | /* Cannot fork to background if no command. */ | |
542 | if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag) | |
543 | fatal("Cannot fork into background without a command to execute."); | |
544 | ||
545 | /* Allocate a tty by default if no command specified. */ | |
546 | if (buffer_len(&command) == 0) | |
547 | tty_flag = 1; | |
548 | ||
e54b3d7c | 549 | /* Force no tty */ |
3c0ef626 | 550 | if (no_tty_flag) |
551 | tty_flag = 0; | |
552 | /* Do not allocate a tty if stdin is not a tty. */ | |
553 | if (!isatty(fileno(stdin)) && !force_tty_flag) { | |
554 | if (tty_flag) | |
70791e56 | 555 | logit("Pseudo-terminal will not be allocated because stdin is not a terminal."); |
3c0ef626 | 556 | tty_flag = 0; |
557 | } | |
558 | ||
559 | /* | |
560 | * Initialize "log" output. Since we are the client all output | |
561 | * actually goes to stderr. | |
562 | */ | |
563 | log_init(av[0], options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level, | |
564 | SYSLOG_FACILITY_USER, 1); | |
565 | ||
566 | /* | |
567 | * Read per-user configuration file. Ignore the system wide config | |
568 | * file if the user specifies a config file on the command line. | |
569 | */ | |
570 | if (config != NULL) { | |
571 | if (!read_config_file(config, host, &options)) | |
572 | fatal("Can't open user config file %.100s: " | |
573 | "%.100s", config, strerror(errno)); | |
574 | } else { | |
078f71c2 | 575 | /* |
576 | * Since the config file parsing code aborts if it sees | |
577 | * options it doesn't recognize, allow users to put | |
578 | * options specific to compile-time add-ons in alternate | |
579 | * config files so their primary config file will | |
580 | * interoperate SSH versions that don't support those | |
581 | * options. | |
582 | */ | |
583 | #ifdef GSSAPI | |
584 | snprintf(buf, sizeof buf, "%.100s/%.100s.gssapi", pw->pw_dir, | |
585 | _PATH_SSH_USER_CONFFILE); | |
586 | (void)read_config_file(buf, host, &options); | |
587 | #ifdef GSI | |
588 | snprintf(buf, sizeof buf, "%.100s/%.100s.gsi", pw->pw_dir, | |
589 | _PATH_SSH_USER_CONFFILE); | |
590 | (void)read_config_file(buf, host, &options); | |
591 | #endif | |
70791e56 | 592 | #if defined(KRB5) |
078f71c2 | 593 | snprintf(buf, sizeof buf, "%.100s/%.100s.krb", pw->pw_dir, |
594 | _PATH_SSH_USER_CONFFILE); | |
595 | (void)read_config_file(buf, host, &options); | |
596 | #endif | |
078f71c2 | 597 | #endif |
3c0ef626 | 598 | snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, |
599 | _PATH_SSH_USER_CONFFILE); | |
600 | (void)read_config_file(buf, host, &options); | |
601 | ||
602 | /* Read systemwide configuration file after use config. */ | |
603 | (void)read_config_file(_PATH_HOST_CONFIG_FILE, host, &options); | |
604 | } | |
605 | ||
606 | /* Fill configuration defaults. */ | |
607 | fill_default_options(&options); | |
608 | ||
70791e56 | 609 | channel_set_af(options.address_family); |
610 | ||
3c0ef626 | 611 | /* reinit */ |
612 | log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 1); | |
613 | ||
614 | seed_rng(); | |
615 | ||
70791e56 | 616 | if (options.user == NULL) { |
617 | options.user = xstrdup(pw->pw_name); | |
618 | options.implicit = 1; | |
619 | } | |
2980ea68 | 620 | else options.implicit = 0; |
3c0ef626 | 621 | |
622 | if (options.hostname != NULL) | |
623 | host = options.hostname; | |
624 | ||
70791e56 | 625 | /* force lowercase for hostkey matching */ |
626 | if (options.host_key_alias != NULL) { | |
627 | for (p = options.host_key_alias; *p; p++) | |
628 | if (isupper(*p)) | |
629 | *p = tolower(*p); | |
630 | } | |
631 | ||
1c14df9e | 632 | if (options.proxy_command != NULL && |
633 | strcmp(options.proxy_command, "none") == 0) | |
634 | options.proxy_command = NULL; | |
635 | ||
3c0ef626 | 636 | /* Open a connection to the remote host. */ |
70791e56 | 637 | if (ssh_connect(host, &hostaddr, options.port, |
638 | options.address_family, options.connection_attempts, | |
ff2d7a98 | 639 | #ifdef HAVE_CYGWIN |
640 | options.use_privileged_port, | |
641 | #else | |
642 | original_effective_uid == 0 && options.use_privileged_port, | |
643 | #endif | |
644 | options.proxy_command) != 0) | |
645 | exit(1); | |
3c0ef626 | 646 | |
647 | /* | |
648 | * If we successfully made the connection, load the host private key | |
649 | * in case we will need it later for combined rsa-rhosts | |
650 | * authentication. This must be done before releasing extra | |
651 | * privileges, because the file is only readable by root. | |
ff2d7a98 | 652 | * If we cannot access the private keys, load the public keys |
653 | * instead and try to execute the ssh-keysign helper instead. | |
3c0ef626 | 654 | */ |
655 | sensitive_data.nkeys = 0; | |
656 | sensitive_data.keys = NULL; | |
ff2d7a98 | 657 | sensitive_data.external_keysign = 0; |
658 | if (options.rhosts_rsa_authentication || | |
659 | options.hostbased_authentication) { | |
3c0ef626 | 660 | sensitive_data.nkeys = 3; |
e54b3d7c | 661 | sensitive_data.keys = xmalloc(sensitive_data.nkeys * |
662 | sizeof(Key)); | |
ff2d7a98 | 663 | |
664 | PRIV_START; | |
3c0ef626 | 665 | sensitive_data.keys[0] = key_load_private_type(KEY_RSA1, |
666 | _PATH_HOST_KEY_FILE, "", NULL); | |
667 | sensitive_data.keys[1] = key_load_private_type(KEY_DSA, | |
668 | _PATH_HOST_DSA_KEY_FILE, "", NULL); | |
669 | sensitive_data.keys[2] = key_load_private_type(KEY_RSA, | |
670 | _PATH_HOST_RSA_KEY_FILE, "", NULL); | |
ff2d7a98 | 671 | PRIV_END; |
672 | ||
e54b3d7c | 673 | if (options.hostbased_authentication == 1 && |
674 | sensitive_data.keys[0] == NULL && | |
ff2d7a98 | 675 | sensitive_data.keys[1] == NULL && |
676 | sensitive_data.keys[2] == NULL) { | |
677 | sensitive_data.keys[1] = key_load_public( | |
678 | _PATH_HOST_DSA_KEY_FILE, NULL); | |
679 | sensitive_data.keys[2] = key_load_public( | |
680 | _PATH_HOST_RSA_KEY_FILE, NULL); | |
681 | sensitive_data.external_keysign = 1; | |
682 | } | |
3c0ef626 | 683 | } |
684 | /* | |
685 | * Get rid of any extra privileges that we may have. We will no | |
686 | * longer need them. Also, extra privileges could make it very hard | |
687 | * to read identity files and other non-world-readable files from the | |
688 | * user's home directory if it happens to be on a NFS volume where | |
689 | * root is mapped to nobody. | |
690 | */ | |
ff2d7a98 | 691 | seteuid(original_real_uid); |
692 | setuid(original_real_uid); | |
3c0ef626 | 693 | |
694 | /* | |
695 | * Now that we are back to our own permissions, create ~/.ssh | |
696 | * directory if it doesn\'t already exist. | |
697 | */ | |
698 | snprintf(buf, sizeof buf, "%.100s%s%.100s", pw->pw_dir, strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR); | |
699 | if (stat(buf, &st) < 0) | |
700 | if (mkdir(buf, 0700) < 0) | |
701 | error("Could not create directory '%.200s'.", buf); | |
702 | ||
3c0ef626 | 703 | /* load options.identity_files */ |
704 | load_public_identity_files(); | |
705 | ||
706 | /* Expand ~ in known host file names. */ | |
707 | /* XXX mem-leaks: */ | |
708 | options.system_hostfile = | |
709 | tilde_expand_filename(options.system_hostfile, original_real_uid); | |
710 | options.user_hostfile = | |
711 | tilde_expand_filename(options.user_hostfile, original_real_uid); | |
712 | options.system_hostfile2 = | |
713 | tilde_expand_filename(options.system_hostfile2, original_real_uid); | |
714 | options.user_hostfile2 = | |
715 | tilde_expand_filename(options.user_hostfile2, original_real_uid); | |
716 | ||
717 | signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */ | |
718 | ||
719 | /* Log into the remote system. This never returns if the login fails. */ | |
ff2d7a98 | 720 | ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr, pw); |
3c0ef626 | 721 | |
722 | /* We no longer need the private host keys. Clear them now. */ | |
723 | if (sensitive_data.nkeys != 0) { | |
724 | for (i = 0; i < sensitive_data.nkeys; i++) { | |
725 | if (sensitive_data.keys[i] != NULL) { | |
726 | /* Destroys contents safely */ | |
727 | debug3("clear hostkey %d", i); | |
728 | key_free(sensitive_data.keys[i]); | |
729 | sensitive_data.keys[i] = NULL; | |
730 | } | |
731 | } | |
732 | xfree(sensitive_data.keys); | |
733 | } | |
734 | for (i = 0; i < options.num_identity_files; i++) { | |
735 | if (options.identity_files[i]) { | |
736 | xfree(options.identity_files[i]); | |
737 | options.identity_files[i] = NULL; | |
738 | } | |
739 | if (options.identity_keys[i]) { | |
740 | key_free(options.identity_keys[i]); | |
741 | options.identity_keys[i] = NULL; | |
742 | } | |
743 | } | |
744 | ||
745 | exit_status = compat20 ? ssh_session2() : ssh_session(); | |
746 | packet_close(); | |
e54b3d7c | 747 | |
748 | /* | |
416fd2a8 | 749 | * Send SIGHUP to proxy command if used. We don't wait() in |
e54b3d7c | 750 | * case it hangs and instead rely on init to reap the child |
751 | */ | |
752 | if (proxy_command_pid > 1) | |
753 | kill(proxy_command_pid, SIGHUP); | |
754 | ||
3c0ef626 | 755 | return exit_status; |
756 | } | |
757 | ||
416fd2a8 | 758 | #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1" |
759 | ||
3c0ef626 | 760 | static void |
e9a17296 | 761 | x11_get_proto(char **_proto, char **_data) |
3c0ef626 | 762 | { |
416fd2a8 | 763 | char cmd[1024]; |
3c0ef626 | 764 | char line[512]; |
416fd2a8 | 765 | char xdisplay[512]; |
e9a17296 | 766 | static char proto[512], data[512]; |
3c0ef626 | 767 | FILE *f; |
416fd2a8 | 768 | int got_data = 0, generated = 0, do_unlink = 0, i; |
769 | char *display, *xauthdir, *xauthfile; | |
e54b3d7c | 770 | struct stat st; |
3c0ef626 | 771 | |
416fd2a8 | 772 | xauthdir = xauthfile = NULL; |
e9a17296 | 773 | *_proto = proto; |
774 | *_data = data; | |
775 | proto[0] = data[0] = '\0'; | |
416fd2a8 | 776 | |
e54b3d7c | 777 | if (!options.xauth_location || |
778 | (stat(options.xauth_location, &st) == -1)) { | |
779 | debug("No xauth program."); | |
780 | } else { | |
781 | if ((display = getenv("DISPLAY")) == NULL) { | |
782 | debug("x11_get_proto: DISPLAY not set"); | |
783 | return; | |
784 | } | |
416fd2a8 | 785 | /* |
786 | * Handle FamilyLocal case where $DISPLAY does | |
787 | * not match an authorization entry. For this we | |
788 | * just try "xauth list unix:displaynum.screennum". | |
789 | * XXX: "localhost" match to determine FamilyLocal | |
790 | * is not perfect. | |
791 | */ | |
792 | if (strncmp(display, "localhost:", 10) == 0) { | |
793 | snprintf(xdisplay, sizeof(xdisplay), "unix:%s", | |
794 | display + 10); | |
795 | display = xdisplay; | |
796 | } | |
797 | if (options.forward_x11_trusted == 0) { | |
798 | xauthdir = xmalloc(MAXPATHLEN); | |
799 | xauthfile = xmalloc(MAXPATHLEN); | |
800 | strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN); | |
801 | if (mkdtemp(xauthdir) != NULL) { | |
802 | do_unlink = 1; | |
803 | snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile", | |
804 | xauthdir); | |
805 | snprintf(cmd, sizeof(cmd), | |
806 | "%s -f %s generate %s " SSH_X11_PROTO | |
807 | " untrusted timeout 120 2>" _PATH_DEVNULL, | |
808 | options.xauth_location, xauthfile, display); | |
809 | debug2("x11_get_proto: %s", cmd); | |
810 | if (system(cmd) == 0) | |
811 | generated = 1; | |
812 | } | |
813 | } | |
814 | snprintf(cmd, sizeof(cmd), | |
815 | "%s %s%s list %s . 2>" _PATH_DEVNULL, | |
816 | options.xauth_location, | |
817 | generated ? "-f " : "" , | |
818 | generated ? xauthfile : "", | |
819 | display); | |
820 | debug2("x11_get_proto: %s", cmd); | |
821 | f = popen(cmd, "r"); | |
3c0ef626 | 822 | if (f && fgets(line, sizeof(line), f) && |
e9a17296 | 823 | sscanf(line, "%*s %511s %511s", proto, data) == 2) |
3c0ef626 | 824 | got_data = 1; |
825 | if (f) | |
826 | pclose(f); | |
827 | } | |
416fd2a8 | 828 | |
829 | if (do_unlink) { | |
830 | unlink(xauthfile); | |
831 | rmdir(xauthdir); | |
832 | } | |
833 | if (xauthdir) | |
834 | xfree(xauthdir); | |
835 | if (xauthfile) | |
836 | xfree(xauthfile); | |
837 | ||
3c0ef626 | 838 | /* |
839 | * If we didn't get authentication data, just make up some | |
840 | * data. The forwarding code will check the validity of the | |
841 | * response anyway, and substitute this data. The X11 | |
842 | * server, however, will ignore this fake data and use | |
843 | * whatever authentication mechanisms it was using otherwise | |
844 | * for the local connection. | |
845 | */ | |
846 | if (!got_data) { | |
847 | u_int32_t rand = 0; | |
848 | ||
416fd2a8 | 849 | logit("Warning: No xauth data; " |
850 | "using fake authentication data for X11 forwarding."); | |
851 | strlcpy(proto, SSH_X11_PROTO, sizeof proto); | |
3c0ef626 | 852 | for (i = 0; i < 16; i++) { |
853 | if (i % 4 == 0) | |
854 | rand = arc4random(); | |
416fd2a8 | 855 | snprintf(data + 2 * i, sizeof data - 2 * i, "%02x", |
856 | rand & 0xff); | |
3c0ef626 | 857 | rand >>= 8; |
858 | } | |
859 | } | |
860 | } | |
861 | ||
862 | static void | |
863 | ssh_init_forwarding(void) | |
864 | { | |
865 | int success = 0; | |
866 | int i; | |
867 | ||
868 | /* Initiate local TCP/IP port forwardings. */ | |
869 | for (i = 0; i < options.num_local_forwards; i++) { | |
870 | debug("Connections to local port %d forwarded to remote address %.200s:%d", | |
871 | options.local_forwards[i].port, | |
872 | options.local_forwards[i].host, | |
873 | options.local_forwards[i].host_port); | |
e9a17296 | 874 | success += channel_setup_local_fwd_listener( |
3c0ef626 | 875 | options.local_forwards[i].port, |
876 | options.local_forwards[i].host, | |
877 | options.local_forwards[i].host_port, | |
878 | options.gateway_ports); | |
879 | } | |
880 | if (i > 0 && success == 0) | |
881 | error("Could not request local forwarding."); | |
882 | ||
883 | /* Initiate remote TCP/IP port forwardings. */ | |
884 | for (i = 0; i < options.num_remote_forwards; i++) { | |
885 | debug("Connections to remote port %d forwarded to local address %.200s:%d", | |
886 | options.remote_forwards[i].port, | |
887 | options.remote_forwards[i].host, | |
888 | options.remote_forwards[i].host_port); | |
889 | channel_request_remote_forwarding( | |
890 | options.remote_forwards[i].port, | |
891 | options.remote_forwards[i].host, | |
892 | options.remote_forwards[i].host_port); | |
893 | } | |
894 | } | |
895 | ||
896 | static void | |
897 | check_agent_present(void) | |
898 | { | |
899 | if (options.forward_agent) { | |
900 | /* Clear agent forwarding if we don\'t have an agent. */ | |
e54b3d7c | 901 | if (!ssh_agent_present()) |
3c0ef626 | 902 | options.forward_agent = 0; |
3c0ef626 | 903 | } |
904 | } | |
905 | ||
906 | static int | |
907 | ssh_session(void) | |
908 | { | |
909 | int type; | |
3c0ef626 | 910 | int interactive = 0; |
911 | int have_tty = 0; | |
912 | struct winsize ws; | |
913 | char *cp; | |
914 | ||
915 | /* Enable compression if requested. */ | |
916 | if (options.compression) { | |
917 | debug("Requesting compression at level %d.", options.compression_level); | |
918 | ||
919 | if (options.compression_level < 1 || options.compression_level > 9) | |
920 | fatal("Compression level must be from 1 (fast) to 9 (slow, best)."); | |
921 | ||
922 | /* Send the request. */ | |
923 | packet_start(SSH_CMSG_REQUEST_COMPRESSION); | |
924 | packet_put_int(options.compression_level); | |
925 | packet_send(); | |
926 | packet_write_wait(); | |
e9a17296 | 927 | type = packet_read(); |
3c0ef626 | 928 | if (type == SSH_SMSG_SUCCESS) |
929 | packet_start_compression(options.compression_level); | |
930 | else if (type == SSH_SMSG_FAILURE) | |
70791e56 | 931 | logit("Warning: Remote host refused compression."); |
3c0ef626 | 932 | else |
933 | packet_disconnect("Protocol error waiting for compression response."); | |
934 | } | |
935 | /* Allocate a pseudo tty if appropriate. */ | |
936 | if (tty_flag) { | |
937 | debug("Requesting pty."); | |
938 | ||
939 | /* Start the packet. */ | |
940 | packet_start(SSH_CMSG_REQUEST_PTY); | |
941 | ||
942 | /* Store TERM in the packet. There is no limit on the | |
943 | length of the string. */ | |
944 | cp = getenv("TERM"); | |
945 | if (!cp) | |
946 | cp = ""; | |
947 | packet_put_cstring(cp); | |
948 | ||
949 | /* Store window size in the packet. */ | |
950 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) | |
951 | memset(&ws, 0, sizeof(ws)); | |
952 | packet_put_int(ws.ws_row); | |
953 | packet_put_int(ws.ws_col); | |
954 | packet_put_int(ws.ws_xpixel); | |
955 | packet_put_int(ws.ws_ypixel); | |
956 | ||
957 | /* Store tty modes in the packet. */ | |
958 | tty_make_modes(fileno(stdin), NULL); | |
959 | ||
960 | /* Send the packet, and wait for it to leave. */ | |
961 | packet_send(); | |
962 | packet_write_wait(); | |
963 | ||
964 | /* Read response from the server. */ | |
e9a17296 | 965 | type = packet_read(); |
3c0ef626 | 966 | if (type == SSH_SMSG_SUCCESS) { |
967 | interactive = 1; | |
968 | have_tty = 1; | |
969 | } else if (type == SSH_SMSG_FAILURE) | |
70791e56 | 970 | logit("Warning: Remote host failed or refused to allocate a pseudo tty."); |
3c0ef626 | 971 | else |
972 | packet_disconnect("Protocol error waiting for pty request response."); | |
973 | } | |
974 | /* Request X11 forwarding if enabled and DISPLAY is set. */ | |
975 | if (options.forward_x11 && getenv("DISPLAY") != NULL) { | |
e9a17296 | 976 | char *proto, *data; |
3c0ef626 | 977 | /* Get reasonable local authentication information. */ |
e9a17296 | 978 | x11_get_proto(&proto, &data); |
3c0ef626 | 979 | /* Request forwarding with authentication spoofing. */ |
980 | debug("Requesting X11 forwarding with authentication spoofing."); | |
981 | x11_request_forwarding_with_spoofing(0, proto, data); | |
982 | ||
983 | /* Read response from the server. */ | |
e9a17296 | 984 | type = packet_read(); |
3c0ef626 | 985 | if (type == SSH_SMSG_SUCCESS) { |
986 | interactive = 1; | |
987 | } else if (type == SSH_SMSG_FAILURE) { | |
70791e56 | 988 | logit("Warning: Remote host denied X11 forwarding."); |
3c0ef626 | 989 | } else { |
990 | packet_disconnect("Protocol error waiting for X11 forwarding"); | |
991 | } | |
992 | } | |
993 | /* Tell the packet module whether this is an interactive session. */ | |
994 | packet_set_interactive(interactive); | |
995 | ||
996 | /* Request authentication agent forwarding if appropriate. */ | |
997 | check_agent_present(); | |
998 | ||
999 | if (options.forward_agent) { | |
1000 | debug("Requesting authentication agent forwarding."); | |
1001 | auth_request_forwarding(); | |
1002 | ||
1003 | /* Read response from the server. */ | |
e9a17296 | 1004 | type = packet_read(); |
1005 | packet_check_eom(); | |
3c0ef626 | 1006 | if (type != SSH_SMSG_SUCCESS) |
70791e56 | 1007 | logit("Warning: Remote host denied authentication agent forwarding."); |
3c0ef626 | 1008 | } |
1009 | ||
1010 | /* Initiate port forwardings. */ | |
1011 | ssh_init_forwarding(); | |
1012 | ||
1013 | /* If requested, let ssh continue in the background. */ | |
1014 | if (fork_after_authentication_flag) | |
1015 | if (daemon(1, 1) < 0) | |
1016 | fatal("daemon() failed: %.200s", strerror(errno)); | |
1017 | ||
1018 | /* | |
1019 | * If a command was specified on the command line, execute the | |
1020 | * command now. Otherwise request the server to start a shell. | |
1021 | */ | |
1022 | if (buffer_len(&command) > 0) { | |
1023 | int len = buffer_len(&command); | |
1024 | if (len > 900) | |
1025 | len = 900; | |
e9a17296 | 1026 | debug("Sending command: %.*s", len, (u_char *)buffer_ptr(&command)); |
3c0ef626 | 1027 | packet_start(SSH_CMSG_EXEC_CMD); |
1028 | packet_put_string(buffer_ptr(&command), buffer_len(&command)); | |
1029 | packet_send(); | |
1030 | packet_write_wait(); | |
1031 | } else { | |
1032 | debug("Requesting shell."); | |
1033 | packet_start(SSH_CMSG_EXEC_SHELL); | |
1034 | packet_send(); | |
1035 | packet_write_wait(); | |
1036 | } | |
1037 | ||
1038 | /* Enter the interactive session. */ | |
1039 | return client_loop(have_tty, tty_flag ? | |
1040 | options.escape_char : SSH_ESCAPECHAR_NONE, 0); | |
1041 | } | |
1042 | ||
1043 | static void | |
e9a17296 | 1044 | client_subsystem_reply(int type, u_int32_t seq, void *ctxt) |
3c0ef626 | 1045 | { |
1046 | int id, len; | |
1047 | ||
1048 | id = packet_get_int(); | |
1049 | len = buffer_len(&command); | |
1050 | if (len > 900) | |
1051 | len = 900; | |
e9a17296 | 1052 | packet_check_eom(); |
3c0ef626 | 1053 | if (type == SSH2_MSG_CHANNEL_FAILURE) |
1054 | fatal("Request for subsystem '%.*s' failed on channel %d", | |
e9a17296 | 1055 | len, (u_char *)buffer_ptr(&command), id); |
3c0ef626 | 1056 | } |
1057 | ||
2980ea68 | 1058 | void |
416fd2a8 | 1059 | client_global_request_reply_fwd(int type, u_int32_t seq, void *ctxt) |
2980ea68 | 1060 | { |
1061 | int i; | |
1062 | ||
1063 | i = client_global_request_id++; | |
416fd2a8 | 1064 | if (i >= options.num_remote_forwards) |
2980ea68 | 1065 | return; |
2980ea68 | 1066 | debug("remote forward %s for: listen %d, connect %s:%d", |
1067 | type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure", | |
1068 | options.remote_forwards[i].port, | |
1069 | options.remote_forwards[i].host, | |
1070 | options.remote_forwards[i].host_port); | |
1071 | if (type == SSH2_MSG_REQUEST_FAILURE) | |
70791e56 | 1072 | logit("Warning: remote port forwarding failed for listen port %d", |
2980ea68 | 1073 | options.remote_forwards[i].port); |
1074 | } | |
1075 | ||
3c0ef626 | 1076 | /* request pty/x11/agent/tcpfwd/shell for channel */ |
1077 | static void | |
1078 | ssh_session2_setup(int id, void *arg) | |
1079 | { | |
1080 | int len; | |
1081 | int interactive = 0; | |
1082 | struct termios tio; | |
1083 | ||
1c14df9e | 1084 | debug2("ssh_session2_setup: id %d", id); |
3c0ef626 | 1085 | |
1086 | if (tty_flag) { | |
1087 | struct winsize ws; | |
1088 | char *cp; | |
1089 | cp = getenv("TERM"); | |
1090 | if (!cp) | |
1091 | cp = ""; | |
1092 | /* Store window size in the packet. */ | |
1093 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) | |
1094 | memset(&ws, 0, sizeof(ws)); | |
1095 | ||
1096 | channel_request_start(id, "pty-req", 0); | |
1097 | packet_put_cstring(cp); | |
1098 | packet_put_int(ws.ws_col); | |
1099 | packet_put_int(ws.ws_row); | |
1100 | packet_put_int(ws.ws_xpixel); | |
1101 | packet_put_int(ws.ws_ypixel); | |
1102 | tio = get_saved_tio(); | |
1103 | tty_make_modes(/*ignored*/ 0, &tio); | |
1104 | packet_send(); | |
1105 | interactive = 1; | |
1106 | /* XXX wait for reply */ | |
1107 | } | |
1108 | if (options.forward_x11 && | |
1109 | getenv("DISPLAY") != NULL) { | |
e9a17296 | 1110 | char *proto, *data; |
3c0ef626 | 1111 | /* Get reasonable local authentication information. */ |
e9a17296 | 1112 | x11_get_proto(&proto, &data); |
3c0ef626 | 1113 | /* Request forwarding with authentication spoofing. */ |
1114 | debug("Requesting X11 forwarding with authentication spoofing."); | |
1115 | x11_request_forwarding_with_spoofing(id, proto, data); | |
1116 | interactive = 1; | |
1117 | /* XXX wait for reply */ | |
1118 | } | |
1119 | ||
1120 | check_agent_present(); | |
1121 | if (options.forward_agent) { | |
1122 | debug("Requesting authentication agent forwarding."); | |
1123 | channel_request_start(id, "auth-agent-req@openssh.com", 0); | |
1124 | packet_send(); | |
1125 | } | |
1126 | ||
1127 | len = buffer_len(&command); | |
1128 | if (len > 0) { | |
1129 | if (len > 900) | |
1130 | len = 900; | |
1131 | if (subsystem_flag) { | |
e9a17296 | 1132 | debug("Sending subsystem: %.*s", len, (u_char *)buffer_ptr(&command)); |
3c0ef626 | 1133 | channel_request_start(id, "subsystem", /*want reply*/ 1); |
1134 | /* register callback for reply */ | |
ff2d7a98 | 1135 | /* XXX we assume that client_loop has already been called */ |
3c0ef626 | 1136 | dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &client_subsystem_reply); |
1137 | dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &client_subsystem_reply); | |
1138 | } else { | |
e9a17296 | 1139 | debug("Sending command: %.*s", len, (u_char *)buffer_ptr(&command)); |
3c0ef626 | 1140 | channel_request_start(id, "exec", 0); |
1141 | } | |
1142 | packet_put_string(buffer_ptr(&command), buffer_len(&command)); | |
1143 | packet_send(); | |
1144 | } else { | |
e9a17296 | 1145 | channel_request_start(id, "shell", 0); |
1146 | packet_send(); | |
3c0ef626 | 1147 | } |
3c0ef626 | 1148 | |
3c0ef626 | 1149 | packet_set_interactive(interactive); |
1150 | } | |
1151 | ||
1152 | /* open new channel for a session */ | |
1153 | static int | |
1154 | ssh_session2_open(void) | |
1155 | { | |
1156 | Channel *c; | |
1157 | int window, packetmax, in, out, err; | |
1158 | ||
1159 | if (stdin_null_flag) { | |
1160 | in = open(_PATH_DEVNULL, O_RDONLY); | |
1161 | } else { | |
1162 | in = dup(STDIN_FILENO); | |
1163 | } | |
1164 | out = dup(STDOUT_FILENO); | |
1165 | err = dup(STDERR_FILENO); | |
1166 | ||
1167 | if (in < 0 || out < 0 || err < 0) | |
1168 | fatal("dup() in/out/err failed"); | |
1169 | ||
1170 | /* enable nonblocking unless tty */ | |
1171 | if (!isatty(in)) | |
1172 | set_nonblock(in); | |
1173 | if (!isatty(out)) | |
1174 | set_nonblock(out); | |
1175 | if (!isatty(err)) | |
1176 | set_nonblock(err); | |
1177 | ||
1178 | window = CHAN_SES_WINDOW_DEFAULT; | |
1179 | packetmax = CHAN_SES_PACKET_DEFAULT; | |
e9a17296 | 1180 | if (tty_flag) { |
1181 | window >>= 1; | |
1182 | packetmax >>= 1; | |
3c0ef626 | 1183 | } |
1184 | c = channel_new( | |
1185 | "session", SSH_CHANNEL_OPENING, in, out, err, | |
1186 | window, packetmax, CHAN_EXTENDED_WRITE, | |
70791e56 | 1187 | "client-session", /*nonblock*/0); |
3c0ef626 | 1188 | |
1189 | debug3("ssh_session2_open: channel_new: %d", c->self); | |
1190 | ||
1191 | channel_send_open(c->self); | |
1192 | if (!no_shell_flag) | |
e9a17296 | 1193 | channel_register_confirm(c->self, ssh_session2_setup); |
3c0ef626 | 1194 | |
1195 | return c->self; | |
1196 | } | |
1197 | ||
1198 | static int | |
1199 | ssh_session2(void) | |
1200 | { | |
1201 | int id = -1; | |
1202 | ||
1203 | /* XXX should be pre-session */ | |
1204 | ssh_init_forwarding(); | |
1205 | ||
1206 | if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN)) | |
1207 | id = ssh_session2_open(); | |
1208 | ||
1209 | /* If requested, let ssh continue in the background. */ | |
1210 | if (fork_after_authentication_flag) | |
1211 | if (daemon(1, 1) < 0) | |
1212 | fatal("daemon() failed: %.200s", strerror(errno)); | |
1213 | ||
1214 | return client_loop(tty_flag, tty_flag ? | |
1215 | options.escape_char : SSH_ESCAPECHAR_NONE, id); | |
1216 | } | |
1217 | ||
1218 | static void | |
1219 | load_public_identity_files(void) | |
1220 | { | |
1221 | char *filename; | |
3c0ef626 | 1222 | int i = 0; |
2980ea68 | 1223 | Key *public; |
3c0ef626 | 1224 | #ifdef SMARTCARD |
2980ea68 | 1225 | Key **keys; |
1226 | ||
3c0ef626 | 1227 | if (options.smartcard_device != NULL && |
2980ea68 | 1228 | options.num_identity_files < SSH_MAX_IDENTITY_FILES && |
1229 | (keys = sc_get_keys(options.smartcard_device, NULL)) != NULL ) { | |
1230 | int count = 0; | |
1231 | for (i = 0; keys[i] != NULL; i++) { | |
1232 | count++; | |
1233 | memmove(&options.identity_files[1], &options.identity_files[0], | |
1234 | sizeof(char *) * (SSH_MAX_IDENTITY_FILES - 1)); | |
1235 | memmove(&options.identity_keys[1], &options.identity_keys[0], | |
1236 | sizeof(Key *) * (SSH_MAX_IDENTITY_FILES - 1)); | |
1237 | options.num_identity_files++; | |
1238 | options.identity_keys[0] = keys[i]; | |
70791e56 | 1239 | options.identity_files[0] = sc_get_key_label(keys[i]); |
2980ea68 | 1240 | } |
1241 | if (options.num_identity_files > SSH_MAX_IDENTITY_FILES) | |
1242 | options.num_identity_files = SSH_MAX_IDENTITY_FILES; | |
1243 | i = count; | |
1244 | xfree(keys); | |
3c0ef626 | 1245 | } |
1246 | #endif /* SMARTCARD */ | |
1247 | for (; i < options.num_identity_files; i++) { | |
1248 | filename = tilde_expand_filename(options.identity_files[i], | |
1249 | original_real_uid); | |
1250 | public = key_load_public(filename, NULL); | |
1251 | debug("identity file %s type %d", filename, | |
1252 | public ? public->type : -1); | |
1253 | xfree(options.identity_files[i]); | |
1254 | options.identity_files[i] = filename; | |
1255 | options.identity_keys[i] = public; | |
1256 | } | |
1257 | } |