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8efc0c15 | 1 | /* |
5260325f | 2 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
3 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
4 | * All rights reserved | |
5260325f | 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 | * | |
bcbf86ec | 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. | |
5fb274c1 | 16 | * Copyright (c) 2000, 2001, 2002 Markus Friedl. All rights reserved. |
bcbf86ec | 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. | |
5260325f | 40 | */ |
8efc0c15 | 41 | |
42 | #include "includes.h" | |
37ba5172 | 43 | RCSID("$OpenBSD: ssh.c,v 1.200 2003/08/13 09:07:10 markus Exp $"); |
8efc0c15 | 44 | |
a306f2dd | 45 | #include <openssl/evp.h> |
fa08c86b | 46 | #include <openssl/err.h> |
a306f2dd | 47 | |
8efc0c15 | 48 | #include "ssh.h" |
42f11eb2 | 49 | #include "ssh1.h" |
50 | #include "ssh2.h" | |
51 | #include "compat.h" | |
52 | #include "cipher.h" | |
53 | #include "xmalloc.h" | |
8efc0c15 | 54 | #include "packet.h" |
55 | #include "buffer.h" | |
a5efa1bb | 56 | #include "channels.h" |
a306f2dd | 57 | #include "key.h" |
4c8722d9 | 58 | #include "authfd.h" |
a306f2dd | 59 | #include "authfile.h" |
42f11eb2 | 60 | #include "pathnames.h" |
b5c334cc | 61 | #include "clientloop.h" |
42f11eb2 | 62 | #include "log.h" |
63 | #include "readconf.h" | |
64 | #include "sshconnect.h" | |
65 | #include "tildexpand.h" | |
1f3bf5aa | 66 | #include "dispatch.h" |
42f11eb2 | 67 | #include "misc.h" |
b2552997 | 68 | #include "kex.h" |
69 | #include "mac.h" | |
30dcc918 | 70 | #include "sshtty.h" |
8efc0c15 | 71 | |
383546c4 | 72 | #ifdef SMARTCARD |
383546c4 | 73 | #include "scard.h" |
dd2495cb | 74 | #endif |
383546c4 | 75 | |
f601d847 | 76 | #ifdef HAVE___PROGNAME |
77 | extern char *__progname; | |
260d427b | 78 | #else |
79 | char *__progname; | |
80 | #endif | |
f601d847 | 81 | |
5260325f | 82 | /* Flag indicating whether debug mode is on. This can be set on the command line. */ |
8efc0c15 | 83 | int debug_flag = 0; |
84 | ||
a8be9f80 | 85 | /* Flag indicating whether a tty should be allocated */ |
8efc0c15 | 86 | int tty_flag = 0; |
8abcdba4 | 87 | int no_tty_flag = 0; |
88 | int force_tty_flag = 0; | |
8efc0c15 | 89 | |
8ce64345 | 90 | /* don't exec a shell */ |
91 | int no_shell_flag = 0; | |
8ce64345 | 92 | |
aa3378df | 93 | /* |
94 | * Flag indicating that nothing should be read from stdin. This can be set | |
95 | * on the command line. | |
96 | */ | |
8efc0c15 | 97 | int stdin_null_flag = 0; |
98 | ||
aa3378df | 99 | /* |
100 | * Flag indicating that ssh should fork after authentication. This is useful | |
c242fc96 | 101 | * so that the passphrase can be entered manually, and then ssh goes to the |
aa3378df | 102 | * background. |
103 | */ | |
8efc0c15 | 104 | int fork_after_authentication_flag = 0; |
105 | ||
aa3378df | 106 | /* |
107 | * General data structure for command line options and options configurable | |
108 | * in configuration files. See readconf.h. | |
109 | */ | |
8efc0c15 | 110 | Options options; |
111 | ||
e591b98a | 112 | /* optional user configfile */ |
113 | char *config = NULL; | |
114 | ||
aa3378df | 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 | */ | |
8efc0c15 | 120 | char *host; |
121 | ||
122 | /* socket address the host resolves to */ | |
48e671d5 | 123 | struct sockaddr_storage hostaddr; |
8efc0c15 | 124 | |
8002af61 | 125 | /* Private host keys. */ |
39c00dc2 | 126 | Sensitive sensitive_data; |
8efc0c15 | 127 | |
128 | /* Original real UID. */ | |
129 | uid_t original_real_uid; | |
3fb156df | 130 | uid_t original_effective_uid; |
8efc0c15 | 131 | |
8ce64345 | 132 | /* command to be executed */ |
133 | Buffer command; | |
134 | ||
ae810de7 | 135 | /* Should we execute a command or invoke a subsystem? */ |
136 | int subsystem_flag = 0; | |
137 | ||
e0ae8728 | 138 | /* # of replies received for global requests */ |
139 | static int client_global_request_id = 0; | |
140 | ||
6939bbd4 | 141 | /* pid of proxycommand child process */ |
142 | pid_t proxy_command_pid = 0; | |
143 | ||
8efc0c15 | 144 | /* Prints a help message to the user. This function never returns. */ |
145 | ||
396c147e | 146 | static void |
5ca51e19 | 147 | usage(void) |
8efc0c15 | 148 | { |
1fe6a48f | 149 | fprintf(stderr, "Usage: %s [options] host [command]\n", __progname); |
5260325f | 150 | fprintf(stderr, "Options:\n"); |
151 | fprintf(stderr, " -l user Log in using this user name.\n"); | |
5ca51e19 | 152 | fprintf(stderr, " -n Redirect input from " _PATH_DEVNULL ".\n"); |
e591b98a | 153 | fprintf(stderr, " -F config Config file (default: ~/%s).\n", |
154 | _PATH_SSH_USER_CONFFILE); | |
71276795 | 155 | fprintf(stderr, " -A Enable authentication agent forwarding.\n"); |
63cd7dd0 | 156 | fprintf(stderr, " -a Disable authentication agent forwarding (default).\n"); |
1c590258 | 157 | fprintf(stderr, " -k Disable Kerberos ticket forwarding.\n"); |
2b87da3b | 158 | fprintf(stderr, " -X Enable X11 connection forwarding.\n"); |
63cd7dd0 | 159 | fprintf(stderr, " -x Disable X11 connection forwarding (default).\n"); |
a01a5f30 | 160 | fprintf(stderr, " -i file Identity for public key authentication " |
161 | "(default: ~/.ssh/identity)\n"); | |
315dfb04 | 162 | #ifdef SMARTCARD |
163 | fprintf(stderr, " -I reader Set smartcard reader.\n"); | |
dd2495cb | 164 | #endif |
5260325f | 165 | fprintf(stderr, " -t Tty; allocate a tty even if command is given.\n"); |
8ce64345 | 166 | fprintf(stderr, " -T Do not allocate a tty.\n"); |
5260325f | 167 | fprintf(stderr, " -v Verbose; display verbose debugging messages.\n"); |
bcbf86ec | 168 | fprintf(stderr, " Multiple -v increases verbosity.\n"); |
5260325f | 169 | fprintf(stderr, " -V Display version number only.\n"); |
5260325f | 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 | ||
63cd7dd0 | 174 | fprintf(stderr, " -c cipher Select encryption algorithm\n"); |
38967add | 175 | fprintf(stderr, " -m macs Specify MAC algorithms for protocol version 2.\n"); |
5260325f | 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"); | |
1fe6a48f | 179 | fprintf(stderr, " These cause %s to listen for connections on a port, and\n", __progname); |
5260325f | 180 | fprintf(stderr, " forward them to the other side by connecting to host:port.\n"); |
4c780c2a | 181 | fprintf(stderr, " -D port Enable dynamic application-level port forwarding.\n"); |
5260325f | 182 | fprintf(stderr, " -C Enable compression.\n"); |
8ce64345 | 183 | fprintf(stderr, " -N Do not execute a shell or command.\n"); |
5260325f | 184 | fprintf(stderr, " -g Allow remote hosts to connect to forwarded ports.\n"); |
1f3bf5aa | 185 | fprintf(stderr, " -1 Force protocol version 1.\n"); |
186 | fprintf(stderr, " -2 Force protocol version 2.\n"); | |
48e671d5 | 187 | fprintf(stderr, " -4 Use IPv4 only.\n"); |
188 | fprintf(stderr, " -6 Use IPv6 only.\n"); | |
5260325f | 189 | fprintf(stderr, " -o 'option' Process the option as if it was read from a configuration file.\n"); |
ae810de7 | 190 | fprintf(stderr, " -s Invoke command (mandatory) as SSH2 subsystem.\n"); |
63cd7dd0 | 191 | fprintf(stderr, " -b addr Local IP address.\n"); |
5260325f | 192 | exit(1); |
8efc0c15 | 193 | } |
194 | ||
396c147e | 195 | static int ssh_session(void); |
196 | static int ssh_session2(void); | |
197 | static void load_public_identity_files(void); | |
8ce64345 | 198 | |
5260325f | 199 | /* |
200 | * Main program for the ssh client. | |
201 | */ | |
8efc0c15 | 202 | int |
203 | main(int ac, char **av) | |
204 | { | |
b34bec32 | 205 | int i, opt, exit_status; |
57112b5a | 206 | u_short fwd_port, fwd_host_port; |
d2e3df16 | 207 | char sfwd_port[6], sfwd_host_port[6]; |
f5a1a01a | 208 | char *p, *cp, buf[256]; |
5260325f | 209 | struct stat st; |
3b1a83df | 210 | struct passwd *pw; |
8ce64345 | 211 | int dummy; |
57dade33 | 212 | extern int optind, optreset; |
1812a662 | 213 | extern char *optarg; |
5260325f | 214 | |
260d427b | 215 | __progname = get_progname(av[0]); |
264dce47 | 216 | init_rng(); |
217 | ||
aa3378df | 218 | /* |
219 | * Save the original real uid. It will be needed later (uid-swapping | |
220 | * may clobber the real uid). | |
221 | */ | |
5260325f | 222 | original_real_uid = getuid(); |
223 | original_effective_uid = geteuid(); | |
9f324470 | 224 | |
225 | /* | |
226 | * Use uid-swapping to give up root privileges for the duration of | |
227 | * option processing. We will re-instantiate the rights when we are | |
228 | * ready to create the privileged port, and will permanently drop | |
229 | * them when the port has been created (actually, when the connection | |
230 | * has been made, as we may need to create the port several times). | |
231 | */ | |
232 | PRIV_END; | |
5260325f | 233 | |
7322ef0e | 234 | #ifdef HAVE_SETRLIMIT |
5260325f | 235 | /* If we are installed setuid root be careful to not drop core. */ |
236 | if (original_real_uid != original_effective_uid) { | |
237 | struct rlimit rlim; | |
238 | rlim.rlim_cur = rlim.rlim_max = 0; | |
239 | if (setrlimit(RLIMIT_CORE, &rlim) < 0) | |
240 | fatal("setrlimit failed: %.100s", strerror(errno)); | |
8efc0c15 | 241 | } |
3c62e7eb | 242 | #endif |
63bd8c36 | 243 | /* Get user data. */ |
244 | pw = getpwuid(original_real_uid); | |
245 | if (!pw) { | |
bbe88b6d | 246 | logit("You don't exist, go away!"); |
63bd8c36 | 247 | exit(1); |
248 | } | |
249 | /* Take a copy of the returned structure. */ | |
250 | pw = pwcopy(pw); | |
251 | ||
aa3378df | 252 | /* |
253 | * Set our umask to something reasonable, as some files are created | |
254 | * with the default umask. This will make them world-readable but | |
255 | * writable only by the owner, which is ok for all files for which we | |
256 | * don't set the modes explicitly. | |
257 | */ | |
5260325f | 258 | umask(022); |
259 | ||
5260325f | 260 | /* Initialize option structure to indicate that no values have been set. */ |
261 | initialize_options(&options); | |
262 | ||
263 | /* Parse command-line arguments. */ | |
264 | host = NULL; | |
265 | ||
f5a1a01a | 266 | again: |
267 | while ((opt = getopt(ac, av, | |
e591b98a | 268 | "1246ab:c:e:fgi:kl:m:no:p:qstvxACD:F:I:L:NPR:TVX")) != -1) { |
5260325f | 269 | switch (opt) { |
1f3bf5aa | 270 | case '1': |
271 | options.protocol = SSH_PROTO_1; | |
272 | break; | |
6ae2364d | 273 | case '2': |
274 | options.protocol = SSH_PROTO_2; | |
275 | break; | |
48e671d5 | 276 | case '4': |
1572b90f | 277 | options.address_family = AF_INET; |
48e671d5 | 278 | break; |
48e671d5 | 279 | case '6': |
1572b90f | 280 | options.address_family = AF_INET6; |
48e671d5 | 281 | break; |
5260325f | 282 | case 'n': |
283 | stdin_null_flag = 1; | |
284 | break; | |
5260325f | 285 | case 'f': |
286 | fork_after_authentication_flag = 1; | |
287 | stdin_null_flag = 1; | |
288 | break; | |
5260325f | 289 | case 'x': |
290 | options.forward_x11 = 0; | |
291 | break; | |
5260325f | 292 | case 'X': |
293 | options.forward_x11 = 1; | |
294 | break; | |
5260325f | 295 | case 'g': |
296 | options.gateway_ports = 1; | |
297 | break; | |
e59404d1 | 298 | case 'P': /* deprecated */ |
5260325f | 299 | options.use_privileged_port = 0; |
300 | break; | |
5260325f | 301 | case 'a': |
302 | options.forward_agent = 0; | |
303 | break; | |
71276795 | 304 | case 'A': |
305 | options.forward_agent = 1; | |
306 | break; | |
5260325f | 307 | case 'k': |
308 | options.kerberos_tgt_passing = 0; | |
5260325f | 309 | break; |
5260325f | 310 | case 'i': |
311 | if (stat(optarg, &st) < 0) { | |
f5a1a01a | 312 | fprintf(stderr, "Warning: Identity file %s " |
313 | "does not exist.\n", optarg); | |
5260325f | 314 | break; |
315 | } | |
f5a1a01a | 316 | if (options.num_identity_files >= |
317 | SSH_MAX_IDENTITY_FILES) | |
318 | fatal("Too many identity files specified " | |
319 | "(max %d)", SSH_MAX_IDENTITY_FILES); | |
320 | options.identity_files[options.num_identity_files++] = | |
321 | xstrdup(optarg); | |
5260325f | 322 | break; |
383546c4 | 323 | case 'I': |
324 | #ifdef SMARTCARD | |
9ff6f66f | 325 | options.smartcard_device = xstrdup(optarg); |
dd2495cb | 326 | #else |
383546c4 | 327 | fprintf(stderr, "no support for smartcards.\n"); |
dd2495cb | 328 | #endif |
383546c4 | 329 | break; |
5260325f | 330 | case 't': |
8abcdba4 | 331 | if (tty_flag) |
332 | force_tty_flag = 1; | |
5260325f | 333 | tty_flag = 1; |
334 | break; | |
5260325f | 335 | case 'v': |
e053cd2c | 336 | if (debug_flag == 0) { |
bcbf86ec | 337 | debug_flag = 1; |
338 | options.log_level = SYSLOG_LEVEL_DEBUG1; | |
e053cd2c | 339 | } else { |
340 | if (options.log_level < SYSLOG_LEVEL_DEBUG3) | |
341 | options.log_level++; | |
bcbf86ec | 342 | break; |
e053cd2c | 343 | } |
bcbf86ec | 344 | /* fallthrough */ |
5260325f | 345 | case 'V': |
e68225b2 | 346 | fprintf(stderr, |
c936c243 | 347 | "%s, SSH protocols %d.%d/%d.%d, %s\n", |
a8be9f80 | 348 | SSH_VERSION, |
349 | PROTOCOL_MAJOR_1, PROTOCOL_MINOR_1, | |
e68225b2 | 350 | PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2, |
c936c243 | 351 | SSLeay_version(SSLEAY_VERSION)); |
5260325f | 352 | if (opt == 'V') |
353 | exit(0); | |
5260325f | 354 | break; |
5260325f | 355 | case 'q': |
356 | options.log_level = SYSLOG_LEVEL_QUIET; | |
357 | break; | |
5260325f | 358 | case 'e': |
359 | if (optarg[0] == '^' && optarg[2] == 0 && | |
f5a1a01a | 360 | (u_char) optarg[1] >= 64 && |
361 | (u_char) optarg[1] < 128) | |
1e3b8b07 | 362 | options.escape_char = (u_char) optarg[1] & 31; |
5260325f | 363 | else if (strlen(optarg) == 1) |
1e3b8b07 | 364 | options.escape_char = (u_char) optarg[0]; |
5260325f | 365 | else if (strcmp(optarg, "none") == 0) |
4bf9c10e | 366 | options.escape_char = SSH_ESCAPECHAR_NONE; |
5260325f | 367 | else { |
f5a1a01a | 368 | fprintf(stderr, "Bad escape character '%s'.\n", |
369 | optarg); | |
5260325f | 370 | exit(1); |
371 | } | |
372 | break; | |
5260325f | 373 | case 'c': |
a306f2dd | 374 | if (ciphers_valid(optarg)) { |
375 | /* SSH2 only */ | |
376 | options.ciphers = xstrdup(optarg); | |
d0c832f3 | 377 | options.cipher = SSH_CIPHER_ILLEGAL; |
a306f2dd | 378 | } else { |
379 | /* SSH1 only */ | |
c523303b | 380 | options.cipher = cipher_number(optarg); |
381 | if (options.cipher == -1) { | |
f5a1a01a | 382 | fprintf(stderr, |
383 | "Unknown cipher type '%s'\n", | |
384 | optarg); | |
a306f2dd | 385 | exit(1); |
386 | } | |
f5a1a01a | 387 | if (options.cipher == SSH_CIPHER_3DES) |
c523303b | 388 | options.ciphers = "3des-cbc"; |
f5a1a01a | 389 | else if (options.cipher == SSH_CIPHER_BLOWFISH) |
c523303b | 390 | options.ciphers = "blowfish-cbc"; |
f5a1a01a | 391 | else |
c523303b | 392 | options.ciphers = (char *)-1; |
5260325f | 393 | } |
394 | break; | |
b2552997 | 395 | case 'm': |
396 | if (mac_valid(optarg)) | |
397 | options.macs = xstrdup(optarg); | |
398 | else { | |
f5a1a01a | 399 | fprintf(stderr, "Unknown mac type '%s'\n", |
400 | optarg); | |
b2552997 | 401 | exit(1); |
402 | } | |
403 | break; | |
5260325f | 404 | case 'p': |
2d2a2c65 | 405 | options.port = a2port(optarg); |
406 | if (options.port == 0) { | |
6031af8d | 407 | fprintf(stderr, "Bad port '%s'\n", optarg); |
408 | exit(1); | |
409 | } | |
5260325f | 410 | break; |
5260325f | 411 | case 'l': |
412 | options.user = optarg; | |
413 | break; | |
d2e3df16 | 414 | |
415 | case 'L': | |
5260325f | 416 | case 'R': |
fa065de2 | 417 | if (sscanf(optarg, "%5[0123456789]:%255[^:]:%5[0123456789]", |
d2e3df16 | 418 | sfwd_port, buf, sfwd_host_port) != 3 && |
fa065de2 | 419 | sscanf(optarg, "%5[0123456789]/%255[^/]/%5[0123456789]", |
d2e3df16 | 420 | sfwd_port, buf, sfwd_host_port) != 3) { |
f5a1a01a | 421 | fprintf(stderr, |
d2e3df16 | 422 | "Bad forwarding specification '%s'\n", |
f5a1a01a | 423 | optarg); |
5260325f | 424 | usage(); |
425 | /* NOTREACHED */ | |
426 | } | |
d2e3df16 | 427 | if ((fwd_port = a2port(sfwd_port)) == 0 || |
762715ce | 428 | (fwd_host_port = a2port(sfwd_host_port)) == 0) { |
f5a1a01a | 429 | fprintf(stderr, |
d2e3df16 | 430 | "Bad forwarding port(s) '%s'\n", optarg); |
431 | exit(1); | |
5260325f | 432 | } |
d2e3df16 | 433 | if (opt == 'L') |
434 | add_local_forward(&options, fwd_port, buf, | |
435 | fwd_host_port); | |
436 | else if (opt == 'R') | |
437 | add_remote_forward(&options, fwd_port, buf, | |
184eed6a | 438 | fwd_host_port); |
5260325f | 439 | break; |
0490e609 | 440 | |
441 | case 'D': | |
2d2a2c65 | 442 | fwd_port = a2port(optarg); |
443 | if (fwd_port == 0) { | |
f5a1a01a | 444 | fprintf(stderr, "Bad dynamic port '%s'\n", |
445 | optarg); | |
6031af8d | 446 | exit(1); |
447 | } | |
37ba5172 | 448 | add_local_forward(&options, fwd_port, "socks", 0); |
0490e609 | 449 | break; |
450 | ||
5260325f | 451 | case 'C': |
452 | options.compression = 1; | |
453 | break; | |
8ce64345 | 454 | case 'N': |
455 | no_shell_flag = 1; | |
456 | no_tty_flag = 1; | |
457 | break; | |
8ce64345 | 458 | case 'T': |
459 | no_tty_flag = 1; | |
460 | break; | |
5260325f | 461 | case 'o': |
462 | dummy = 1; | |
f5a1a01a | 463 | if (process_config_line(&options, host ? host : "", |
464 | optarg, "command-line", 0, &dummy) != 0) | |
5260325f | 465 | exit(1); |
466 | break; | |
ae810de7 | 467 | case 's': |
468 | subsystem_flag = 1; | |
469 | break; | |
3435f5a6 | 470 | case 'b': |
471 | options.bind_address = optarg; | |
472 | break; | |
e591b98a | 473 | case 'F': |
474 | config = optarg; | |
475 | break; | |
5260325f | 476 | default: |
477 | usage(); | |
478 | } | |
479 | } | |
480 | ||
f5a1a01a | 481 | ac -= optind; |
482 | av += optind; | |
483 | ||
484 | if (ac > 0 && !host && **av != '-') { | |
15748b4d | 485 | if (strrchr(*av, '@')) { |
f5a1a01a | 486 | p = xstrdup(*av); |
15748b4d | 487 | cp = strrchr(p, '@'); |
f5a1a01a | 488 | if (cp == NULL || cp == p) |
489 | usage(); | |
490 | options.user = p; | |
491 | *cp = '\0'; | |
492 | host = ++cp; | |
493 | } else | |
494 | host = *av; | |
978ebf99 | 495 | if (ac > 1) { |
496 | optind = optreset = 1; | |
f5a1a01a | 497 | goto again; |
498 | } | |
978ebf99 | 499 | ac--, av++; |
f5a1a01a | 500 | } |
501 | ||
5260325f | 502 | /* Check that we got a host name. */ |
503 | if (!host) | |
8efc0c15 | 504 | usage(); |
5260325f | 505 | |
22d89d24 | 506 | SSLeay_add_all_algorithms(); |
fa08c86b | 507 | ERR_load_crypto_strings(); |
22d89d24 | 508 | |
5260325f | 509 | /* Initialize the command to execute on remote host. */ |
510 | buffer_init(&command); | |
511 | ||
aa3378df | 512 | /* |
513 | * Save the command to execute on the remote host in a buffer. There | |
514 | * is no limit on the length of the command, except by the maximum | |
515 | * packet size. Also sets the tty flag if there is no command. | |
516 | */ | |
f5a1a01a | 517 | if (!ac) { |
5260325f | 518 | /* No command specified - execute shell on a tty. */ |
519 | tty_flag = 1; | |
ae810de7 | 520 | if (subsystem_flag) { |
f5a1a01a | 521 | fprintf(stderr, |
522 | "You must specify a subsystem to invoke.\n"); | |
ae810de7 | 523 | usage(); |
524 | } | |
5260325f | 525 | } else { |
f5a1a01a | 526 | /* A command has been specified. Store it into the buffer. */ |
527 | for (i = 0; i < ac; i++) { | |
528 | if (i) | |
5260325f | 529 | buffer_append(&command, " ", 1); |
530 | buffer_append(&command, av[i], strlen(av[i])); | |
531 | } | |
8efc0c15 | 532 | } |
5260325f | 533 | |
534 | /* Cannot fork to background if no command. */ | |
14a9a859 | 535 | if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag) |
5260325f | 536 | fatal("Cannot fork into background without a command to execute."); |
537 | ||
538 | /* Allocate a tty by default if no command specified. */ | |
539 | if (buffer_len(&command) == 0) | |
540 | tty_flag = 1; | |
541 | ||
343288b8 | 542 | /* Force no tty */ |
0b6fbf03 | 543 | if (no_tty_flag) |
544 | tty_flag = 0; | |
5260325f | 545 | /* Do not allocate a tty if stdin is not a tty. */ |
8abcdba4 | 546 | if (!isatty(fileno(stdin)) && !force_tty_flag) { |
5260325f | 547 | if (tty_flag) |
bbe88b6d | 548 | logit("Pseudo-terminal will not be allocated because stdin is not a terminal."); |
5260325f | 549 | tty_flag = 0; |
550 | } | |
8ce64345 | 551 | |
20244695 | 552 | /* |
553 | * Initialize "log" output. Since we are the client all output | |
554 | * actually goes to stderr. | |
555 | */ | |
cc44f691 | 556 | log_init(av[0], options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level, |
557 | SYSLOG_FACILITY_USER, 1); | |
5260325f | 558 | |
e591b98a | 559 | /* |
560 | * Read per-user configuration file. Ignore the system wide config | |
561 | * file if the user specifies a config file on the command line. | |
562 | */ | |
563 | if (config != NULL) { | |
93111dfa | 564 | if (!read_config_file(config, host, &options)) |
565 | fatal("Can't open user config file %.100s: " | |
566 | "%.100s", config, strerror(errno)); | |
e591b98a | 567 | } else { |
568 | snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, | |
569 | _PATH_SSH_USER_CONFFILE); | |
f67792f2 | 570 | (void)read_config_file(buf, host, &options); |
e591b98a | 571 | |
f67792f2 | 572 | /* Read systemwide configuration file after use config. */ |
93111dfa | 573 | (void)read_config_file(_PATH_HOST_CONFIG_FILE, host, &options); |
e591b98a | 574 | } |
5260325f | 575 | |
576 | /* Fill configuration defaults. */ | |
577 | fill_default_options(&options); | |
578 | ||
1572b90f | 579 | channel_set_af(options.address_family); |
580 | ||
5260325f | 581 | /* reinit */ |
20244695 | 582 | log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 1); |
5260325f | 583 | |
e339aa53 | 584 | seed_rng(); |
585 | ||
5260325f | 586 | if (options.user == NULL) |
587 | options.user = xstrdup(pw->pw_name); | |
588 | ||
589 | if (options.hostname != NULL) | |
590 | host = options.hostname; | |
591 | ||
03c82656 | 592 | /* force lowercase for hostkey matching */ |
593 | if (options.host_key_alias != NULL) { | |
594 | for (p = options.host_key_alias; *p; p++) | |
595 | if (isupper(*p)) | |
596 | *p = tolower(*p); | |
597 | } | |
598 | ||
f78bde70 | 599 | if (options.proxy_command != NULL && |
600 | strcmp(options.proxy_command, "none") == 0) | |
601 | options.proxy_command = NULL; | |
602 | ||
6ffc9c88 | 603 | /* Open a connection to the remote host. */ |
1572b90f | 604 | if (ssh_connect(host, &hostaddr, options.port, |
605 | options.address_family, options.connection_attempts, | |
d514c907 | 606 | #ifdef HAVE_CYGWIN |
607 | options.use_privileged_port, | |
608 | #else | |
3fb156df | 609 | original_effective_uid == 0 && options.use_privileged_port, |
d514c907 | 610 | #endif |
de60473e | 611 | options.proxy_command) != 0) |
b34bec32 | 612 | exit(1); |
5260325f | 613 | |
aa3378df | 614 | /* |
615 | * If we successfully made the connection, load the host private key | |
616 | * in case we will need it later for combined rsa-rhosts | |
617 | * authentication. This must be done before releasing extra | |
618 | * privileges, because the file is only readable by root. | |
78660ed4 | 619 | * If we cannot access the private keys, load the public keys |
620 | * instead and try to execute the ssh-keysign helper instead. | |
aa3378df | 621 | */ |
8002af61 | 622 | sensitive_data.nkeys = 0; |
623 | sensitive_data.keys = NULL; | |
39c00dc2 | 624 | sensitive_data.external_keysign = 0; |
b34bec32 | 625 | if (options.rhosts_rsa_authentication || |
626 | options.hostbased_authentication) { | |
8002af61 | 627 | sensitive_data.nkeys = 3; |
343288b8 | 628 | sensitive_data.keys = xmalloc(sensitive_data.nkeys * |
629 | sizeof(Key)); | |
3fb156df | 630 | |
631 | PRIV_START; | |
8002af61 | 632 | sensitive_data.keys[0] = key_load_private_type(KEY_RSA1, |
aeaa3d9e | 633 | _PATH_HOST_KEY_FILE, "", NULL); |
8002af61 | 634 | sensitive_data.keys[1] = key_load_private_type(KEY_DSA, |
635 | _PATH_HOST_DSA_KEY_FILE, "", NULL); | |
636 | sensitive_data.keys[2] = key_load_private_type(KEY_RSA, | |
637 | _PATH_HOST_RSA_KEY_FILE, "", NULL); | |
3fb156df | 638 | PRIV_END; |
39c00dc2 | 639 | |
60cd0a97 | 640 | if (options.hostbased_authentication == 1 && |
641 | sensitive_data.keys[0] == NULL && | |
39c00dc2 | 642 | sensitive_data.keys[1] == NULL && |
643 | sensitive_data.keys[2] == NULL) { | |
644 | sensitive_data.keys[1] = key_load_public( | |
645 | _PATH_HOST_DSA_KEY_FILE, NULL); | |
646 | sensitive_data.keys[2] = key_load_public( | |
647 | _PATH_HOST_RSA_KEY_FILE, NULL); | |
648 | sensitive_data.external_keysign = 1; | |
649 | } | |
5260325f | 650 | } |
aa3378df | 651 | /* |
652 | * Get rid of any extra privileges that we may have. We will no | |
653 | * longer need them. Also, extra privileges could make it very hard | |
654 | * to read identity files and other non-world-readable files from the | |
655 | * user's home directory if it happens to be on a NFS volume where | |
656 | * root is mapped to nobody. | |
657 | */ | |
3fb156df | 658 | seteuid(original_real_uid); |
659 | setuid(original_real_uid); | |
5260325f | 660 | |
aa3378df | 661 | /* |
662 | * Now that we are back to our own permissions, create ~/.ssh | |
663 | * directory if it doesn\'t already exist. | |
664 | */ | |
c3abff07 | 665 | snprintf(buf, sizeof buf, "%.100s%s%.100s", pw->pw_dir, strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR); |
5260325f | 666 | if (stat(buf, &st) < 0) |
704b1659 | 667 | if (mkdir(buf, 0700) < 0) |
5260325f | 668 | error("Could not create directory '%.200s'.", buf); |
669 | ||
fee56204 | 670 | /* load options.identity_files */ |
671 | load_public_identity_files(); | |
672 | ||
673 | /* Expand ~ in known host file names. */ | |
674 | /* XXX mem-leaks: */ | |
fa08c86b | 675 | options.system_hostfile = |
676 | tilde_expand_filename(options.system_hostfile, original_real_uid); | |
677 | options.user_hostfile = | |
678 | tilde_expand_filename(options.user_hostfile, original_real_uid); | |
679 | options.system_hostfile2 = | |
680 | tilde_expand_filename(options.system_hostfile2, original_real_uid); | |
681 | options.user_hostfile2 = | |
682 | tilde_expand_filename(options.user_hostfile2, original_real_uid); | |
5260325f | 683 | |
67b75437 | 684 | signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */ |
685 | ||
5260325f | 686 | /* Log into the remote system. This never returns if the login fails. */ |
39c00dc2 | 687 | ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr, pw); |
8002af61 | 688 | |
689 | /* We no longer need the private host keys. Clear them now. */ | |
690 | if (sensitive_data.nkeys != 0) { | |
691 | for (i = 0; i < sensitive_data.nkeys; i++) { | |
692 | if (sensitive_data.keys[i] != NULL) { | |
693 | /* Destroys contents safely */ | |
694 | debug3("clear hostkey %d", i); | |
695 | key_free(sensitive_data.keys[i]); | |
696 | sensitive_data.keys[i] = NULL; | |
697 | } | |
698 | } | |
699 | xfree(sensitive_data.keys); | |
700 | } | |
05b7537a | 701 | for (i = 0; i < options.num_identity_files; i++) { |
702 | if (options.identity_files[i]) { | |
703 | xfree(options.identity_files[i]); | |
704 | options.identity_files[i] = NULL; | |
705 | } | |
706 | if (options.identity_keys[i]) { | |
707 | key_free(options.identity_keys[i]); | |
708 | options.identity_keys[i] = NULL; | |
709 | } | |
710 | } | |
5260325f | 711 | |
8ce64345 | 712 | exit_status = compat20 ? ssh_session2() : ssh_session(); |
713 | packet_close(); | |
6939bbd4 | 714 | |
715 | /* | |
716 | * Send SIGHUP to proxy command if used. We don't wait() in | |
717 | * case it hangs and instead rely on init to reap the child | |
718 | */ | |
719 | if (proxy_command_pid > 1) | |
720 | kill(proxy_command_pid, SIGHUP); | |
721 | ||
8ce64345 | 722 | return exit_status; |
723 | } | |
724 | ||
396c147e | 725 | static void |
b48eeb07 | 726 | x11_get_proto(char **_proto, char **_data) |
0b242b12 | 727 | { |
728 | char line[512]; | |
b48eeb07 | 729 | static char proto[512], data[512]; |
0b242b12 | 730 | FILE *f; |
731 | int got_data = 0, i; | |
75a624f0 | 732 | char *display; |
5d185586 | 733 | struct stat st; |
0b242b12 | 734 | |
b48eeb07 | 735 | *_proto = proto; |
736 | *_data = data; | |
737 | proto[0] = data[0] = '\0'; | |
5d185586 | 738 | if (!options.xauth_location || |
739 | (stat(options.xauth_location, &st) == -1)) { | |
740 | debug("No xauth program."); | |
741 | } else { | |
742 | if ((display = getenv("DISPLAY")) == NULL) { | |
743 | debug("x11_get_proto: DISPLAY not set"); | |
744 | return; | |
745 | } | |
fa649821 | 746 | /* Try to get Xauthority information for the display. */ |
75a624f0 | 747 | if (strncmp(display, "localhost:", 10) == 0) |
748 | /* | |
749 | * Handle FamilyLocal case where $DISPLAY does | |
750 | * not match an authorization entry. For this we | |
751 | * just try "xauth list unix:displaynum.screennum". | |
752 | * XXX: "localhost" match to determine FamilyLocal | |
753 | * is not perfect. | |
754 | */ | |
375e20e7 | 755 | snprintf(line, sizeof line, "%s list unix:%s 2>" |
75a624f0 | 756 | _PATH_DEVNULL, options.xauth_location, display+10); |
757 | else | |
375e20e7 | 758 | snprintf(line, sizeof line, "%s list %.200s 2>" |
75a624f0 | 759 | _PATH_DEVNULL, options.xauth_location, display); |
5d185586 | 760 | debug2("x11_get_proto: %s", line); |
fa649821 | 761 | f = popen(line, "r"); |
762 | if (f && fgets(line, sizeof(line), f) && | |
b48eeb07 | 763 | sscanf(line, "%*s %511s %511s", proto, data) == 2) |
fa649821 | 764 | got_data = 1; |
765 | if (f) | |
766 | pclose(f); | |
767 | } | |
0b242b12 | 768 | /* |
769 | * If we didn't get authentication data, just make up some | |
770 | * data. The forwarding code will check the validity of the | |
771 | * response anyway, and substitute this data. The X11 | |
772 | * server, however, will ignore this fake data and use | |
773 | * whatever authentication mechanisms it was using otherwise | |
774 | * for the local connection. | |
775 | */ | |
776 | if (!got_data) { | |
777 | u_int32_t rand = 0; | |
778 | ||
bbe88b6d | 779 | logit("Warning: No xauth data; using fake authentication data for X11 forwarding."); |
b48eeb07 | 780 | strlcpy(proto, "MIT-MAGIC-COOKIE-1", sizeof proto); |
0b242b12 | 781 | for (i = 0; i < 16; i++) { |
782 | if (i % 4 == 0) | |
783 | rand = arc4random(); | |
b48eeb07 | 784 | snprintf(data + 2 * i, sizeof data - 2 * i, "%02x", rand & 0xff); |
0b242b12 | 785 | rand >>= 8; |
786 | } | |
787 | } | |
788 | } | |
789 | ||
396c147e | 790 | static void |
fa08c86b | 791 | ssh_init_forwarding(void) |
792 | { | |
02a024dd | 793 | int success = 0; |
fa08c86b | 794 | int i; |
02a024dd | 795 | |
fa08c86b | 796 | /* Initiate local TCP/IP port forwardings. */ |
797 | for (i = 0; i < options.num_local_forwards; i++) { | |
798 | debug("Connections to local port %d forwarded to remote address %.200s:%d", | |
799 | options.local_forwards[i].port, | |
800 | options.local_forwards[i].host, | |
801 | options.local_forwards[i].host_port); | |
5641aefa | 802 | success += channel_setup_local_fwd_listener( |
fa08c86b | 803 | options.local_forwards[i].port, |
804 | options.local_forwards[i].host, | |
805 | options.local_forwards[i].host_port, | |
806 | options.gateway_ports); | |
807 | } | |
02a024dd | 808 | if (i > 0 && success == 0) |
809 | error("Could not request local forwarding."); | |
fa08c86b | 810 | |
811 | /* Initiate remote TCP/IP port forwardings. */ | |
812 | for (i = 0; i < options.num_remote_forwards; i++) { | |
813 | debug("Connections to remote port %d forwarded to local address %.200s:%d", | |
814 | options.remote_forwards[i].port, | |
815 | options.remote_forwards[i].host, | |
816 | options.remote_forwards[i].host_port); | |
817 | channel_request_remote_forwarding( | |
818 | options.remote_forwards[i].port, | |
819 | options.remote_forwards[i].host, | |
820 | options.remote_forwards[i].host_port); | |
821 | } | |
822 | } | |
823 | ||
396c147e | 824 | static void |
fa08c86b | 825 | check_agent_present(void) |
826 | { | |
827 | if (options.forward_agent) { | |
828 | /* Clear agent forwarding if we don\'t have an agent. */ | |
8b10e20e | 829 | if (!ssh_agent_present()) |
fa08c86b | 830 | options.forward_agent = 0; |
fa08c86b | 831 | } |
832 | } | |
833 | ||
396c147e | 834 | static int |
8ce64345 | 835 | ssh_session(void) |
836 | { | |
837 | int type; | |
8ce64345 | 838 | int interactive = 0; |
839 | int have_tty = 0; | |
840 | struct winsize ws; | |
8ce64345 | 841 | char *cp; |
842 | ||
5260325f | 843 | /* Enable compression if requested. */ |
844 | if (options.compression) { | |
845 | debug("Requesting compression at level %d.", options.compression_level); | |
846 | ||
847 | if (options.compression_level < 1 || options.compression_level > 9) | |
848 | fatal("Compression level must be from 1 (fast) to 9 (slow, best)."); | |
849 | ||
850 | /* Send the request. */ | |
851 | packet_start(SSH_CMSG_REQUEST_COMPRESSION); | |
852 | packet_put_int(options.compression_level); | |
853 | packet_send(); | |
854 | packet_write_wait(); | |
54a5250f | 855 | type = packet_read(); |
5260325f | 856 | if (type == SSH_SMSG_SUCCESS) |
857 | packet_start_compression(options.compression_level); | |
858 | else if (type == SSH_SMSG_FAILURE) | |
bbe88b6d | 859 | logit("Warning: Remote host refused compression."); |
5260325f | 860 | else |
861 | packet_disconnect("Protocol error waiting for compression response."); | |
862 | } | |
863 | /* Allocate a pseudo tty if appropriate. */ | |
864 | if (tty_flag) { | |
865 | debug("Requesting pty."); | |
866 | ||
867 | /* Start the packet. */ | |
868 | packet_start(SSH_CMSG_REQUEST_PTY); | |
869 | ||
870 | /* Store TERM in the packet. There is no limit on the | |
871 | length of the string. */ | |
872 | cp = getenv("TERM"); | |
873 | if (!cp) | |
874 | cp = ""; | |
449c5ba5 | 875 | packet_put_cstring(cp); |
5260325f | 876 | |
877 | /* Store window size in the packet. */ | |
878 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) | |
879 | memset(&ws, 0, sizeof(ws)); | |
880 | packet_put_int(ws.ws_row); | |
881 | packet_put_int(ws.ws_col); | |
882 | packet_put_int(ws.ws_xpixel); | |
883 | packet_put_int(ws.ws_ypixel); | |
884 | ||
885 | /* Store tty modes in the packet. */ | |
30dcc918 | 886 | tty_make_modes(fileno(stdin), NULL); |
5260325f | 887 | |
888 | /* Send the packet, and wait for it to leave. */ | |
889 | packet_send(); | |
890 | packet_write_wait(); | |
891 | ||
892 | /* Read response from the server. */ | |
54a5250f | 893 | type = packet_read(); |
4fe2af09 | 894 | if (type == SSH_SMSG_SUCCESS) { |
5260325f | 895 | interactive = 1; |
8ce64345 | 896 | have_tty = 1; |
4fe2af09 | 897 | } else if (type == SSH_SMSG_FAILURE) |
bbe88b6d | 898 | logit("Warning: Remote host failed or refused to allocate a pseudo tty."); |
5260325f | 899 | else |
900 | packet_disconnect("Protocol error waiting for pty request response."); | |
901 | } | |
902 | /* Request X11 forwarding if enabled and DISPLAY is set. */ | |
903 | if (options.forward_x11 && getenv("DISPLAY") != NULL) { | |
b48eeb07 | 904 | char *proto, *data; |
0b242b12 | 905 | /* Get reasonable local authentication information. */ |
b48eeb07 | 906 | x11_get_proto(&proto, &data); |
0b242b12 | 907 | /* Request forwarding with authentication spoofing. */ |
5260325f | 908 | debug("Requesting X11 forwarding with authentication spoofing."); |
0b242b12 | 909 | x11_request_forwarding_with_spoofing(0, proto, data); |
5260325f | 910 | |
911 | /* Read response from the server. */ | |
54a5250f | 912 | type = packet_read(); |
5260325f | 913 | if (type == SSH_SMSG_SUCCESS) { |
5260325f | 914 | interactive = 1; |
0b242b12 | 915 | } else if (type == SSH_SMSG_FAILURE) { |
bbe88b6d | 916 | logit("Warning: Remote host denied X11 forwarding."); |
0b242b12 | 917 | } else { |
5260325f | 918 | packet_disconnect("Protocol error waiting for X11 forwarding"); |
0b242b12 | 919 | } |
5260325f | 920 | } |
921 | /* Tell the packet module whether this is an interactive session. */ | |
b5c334cc | 922 | packet_set_interactive(interactive); |
5260325f | 923 | |
924 | /* Request authentication agent forwarding if appropriate. */ | |
fa08c86b | 925 | check_agent_present(); |
926 | ||
5260325f | 927 | if (options.forward_agent) { |
928 | debug("Requesting authentication agent forwarding."); | |
929 | auth_request_forwarding(); | |
930 | ||
931 | /* Read response from the server. */ | |
54a5250f | 932 | type = packet_read(); |
95500969 | 933 | packet_check_eom(); |
5260325f | 934 | if (type != SSH_SMSG_SUCCESS) |
bbe88b6d | 935 | logit("Warning: Remote host denied authentication agent forwarding."); |
5260325f | 936 | } |
8efc0c15 | 937 | |
fa08c86b | 938 | /* Initiate port forwardings. */ |
939 | ssh_init_forwarding(); | |
5260325f | 940 | |
aa3378df | 941 | /* If requested, let ssh continue in the background. */ |
6ae2364d | 942 | if (fork_after_authentication_flag) |
aa3378df | 943 | if (daemon(1, 1) < 0) |
944 | fatal("daemon() failed: %.200s", strerror(errno)); | |
945 | ||
946 | /* | |
947 | * If a command was specified on the command line, execute the | |
948 | * command now. Otherwise request the server to start a shell. | |
949 | */ | |
5260325f | 950 | if (buffer_len(&command) > 0) { |
951 | int len = buffer_len(&command); | |
952 | if (len > 900) | |
953 | len = 900; | |
6c0fa2b1 | 954 | debug("Sending command: %.*s", len, (u_char *)buffer_ptr(&command)); |
5260325f | 955 | packet_start(SSH_CMSG_EXEC_CMD); |
956 | packet_put_string(buffer_ptr(&command), buffer_len(&command)); | |
957 | packet_send(); | |
958 | packet_write_wait(); | |
959 | } else { | |
960 | debug("Requesting shell."); | |
961 | packet_start(SSH_CMSG_EXEC_SHELL); | |
962 | packet_send(); | |
963 | packet_write_wait(); | |
964 | } | |
965 | ||
966 | /* Enter the interactive session. */ | |
4bf9c10e | 967 | return client_loop(have_tty, tty_flag ? |
968 | options.escape_char : SSH_ESCAPECHAR_NONE, 0); | |
8ce64345 | 969 | } |
5260325f | 970 | |
396c147e | 971 | static void |
7819b5c3 | 972 | client_subsystem_reply(int type, u_int32_t seq, void *ctxt) |
1f3bf5aa | 973 | { |
974 | int id, len; | |
975 | ||
976 | id = packet_get_int(); | |
977 | len = buffer_len(&command); | |
ce91d6f8 | 978 | if (len > 900) |
979 | len = 900; | |
95500969 | 980 | packet_check_eom(); |
1f3bf5aa | 981 | if (type == SSH2_MSG_CHANNEL_FAILURE) |
982 | fatal("Request for subsystem '%.*s' failed on channel %d", | |
6c0fa2b1 | 983 | len, (u_char *)buffer_ptr(&command), id); |
1f3bf5aa | 984 | } |
985 | ||
e0ae8728 | 986 | void |
987 | client_global_request_reply(int type, u_int32_t seq, void *ctxt) | |
988 | { | |
989 | int i; | |
990 | ||
991 | i = client_global_request_id++; | |
992 | if (i >= options.num_remote_forwards) { | |
993 | debug("client_global_request_reply: too many replies %d > %d", | |
994 | i, options.num_remote_forwards); | |
995 | return; | |
996 | } | |
997 | debug("remote forward %s for: listen %d, connect %s:%d", | |
998 | type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure", | |
999 | options.remote_forwards[i].port, | |
1000 | options.remote_forwards[i].host, | |
1001 | options.remote_forwards[i].host_port); | |
1002 | if (type == SSH2_MSG_REQUEST_FAILURE) | |
bbe88b6d | 1003 | logit("Warning: remote port forwarding failed for listen port %d", |
e0ae8728 | 1004 | options.remote_forwards[i].port); |
1005 | } | |
1006 | ||
bcdb96c2 | 1007 | /* request pty/x11/agent/tcpfwd/shell for channel */ |
396c147e | 1008 | static void |
bcdb96c2 | 1009 | ssh_session2_setup(int id, void *arg) |
8ce64345 | 1010 | { |
1011 | int len; | |
b5c334cc | 1012 | int interactive = 0; |
30dcc918 | 1013 | struct termios tio; |
b5c334cc | 1014 | |
83bbc162 | 1015 | debug2("ssh_session2_setup: id %d", id); |
8ce64345 | 1016 | |
8ce64345 | 1017 | if (tty_flag) { |
1018 | struct winsize ws; | |
1019 | char *cp; | |
1020 | cp = getenv("TERM"); | |
1021 | if (!cp) | |
1022 | cp = ""; | |
1023 | /* Store window size in the packet. */ | |
1024 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) | |
1025 | memset(&ws, 0, sizeof(ws)); | |
1026 | ||
1027 | channel_request_start(id, "pty-req", 0); | |
1028 | packet_put_cstring(cp); | |
1029 | packet_put_int(ws.ws_col); | |
1030 | packet_put_int(ws.ws_row); | |
1031 | packet_put_int(ws.ws_xpixel); | |
1032 | packet_put_int(ws.ws_ypixel); | |
30dcc918 | 1033 | tio = get_saved_tio(); |
1034 | tty_make_modes(/*ignored*/ 0, &tio); | |
8ce64345 | 1035 | packet_send(); |
b5c334cc | 1036 | interactive = 1; |
8ce64345 | 1037 | /* XXX wait for reply */ |
1038 | } | |
0b242b12 | 1039 | if (options.forward_x11 && |
1040 | getenv("DISPLAY") != NULL) { | |
b48eeb07 | 1041 | char *proto, *data; |
0b242b12 | 1042 | /* Get reasonable local authentication information. */ |
b48eeb07 | 1043 | x11_get_proto(&proto, &data); |
0b242b12 | 1044 | /* Request forwarding with authentication spoofing. */ |
1045 | debug("Requesting X11 forwarding with authentication spoofing."); | |
1046 | x11_request_forwarding_with_spoofing(id, proto, data); | |
b5c334cc | 1047 | interactive = 1; |
0b242b12 | 1048 | /* XXX wait for reply */ |
1049 | } | |
1050 | ||
fa08c86b | 1051 | check_agent_present(); |
1052 | if (options.forward_agent) { | |
1053 | debug("Requesting authentication agent forwarding."); | |
1054 | channel_request_start(id, "auth-agent-req@openssh.com", 0); | |
1055 | packet_send(); | |
1056 | } | |
1057 | ||
8ce64345 | 1058 | len = buffer_len(&command); |
1059 | if (len > 0) { | |
1060 | if (len > 900) | |
1061 | len = 900; | |
ae810de7 | 1062 | if (subsystem_flag) { |
6c0fa2b1 | 1063 | debug("Sending subsystem: %.*s", len, (u_char *)buffer_ptr(&command)); |
1f3bf5aa | 1064 | channel_request_start(id, "subsystem", /*want reply*/ 1); |
1065 | /* register callback for reply */ | |
c242fc96 | 1066 | /* XXX we assume that client_loop has already been called */ |
1f3bf5aa | 1067 | dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &client_subsystem_reply); |
1068 | dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &client_subsystem_reply); | |
ae810de7 | 1069 | } else { |
6c0fa2b1 | 1070 | debug("Sending command: %.*s", len, (u_char *)buffer_ptr(&command)); |
ae810de7 | 1071 | channel_request_start(id, "exec", 0); |
1072 | } | |
ce91d6f8 | 1073 | packet_put_string(buffer_ptr(&command), buffer_len(&command)); |
8ce64345 | 1074 | packet_send(); |
1075 | } else { | |
06ee33fb | 1076 | channel_request_start(id, "shell", 0); |
1077 | packet_send(); | |
8ce64345 | 1078 | } |
1f3bf5aa | 1079 | |
b5c334cc | 1080 | packet_set_interactive(interactive); |
8ce64345 | 1081 | } |
1082 | ||
bcdb96c2 | 1083 | /* open new channel for a session */ |
396c147e | 1084 | static int |
bcdb96c2 | 1085 | ssh_session2_open(void) |
8ce64345 | 1086 | { |
719fc62f | 1087 | Channel *c; |
1088 | int window, packetmax, in, out, err; | |
2e73a022 | 1089 | |
14a9a859 | 1090 | if (stdin_null_flag) { |
5ca51e19 | 1091 | in = open(_PATH_DEVNULL, O_RDONLY); |
14a9a859 | 1092 | } else { |
1093 | in = dup(STDIN_FILENO); | |
1094 | } | |
2e73a022 | 1095 | out = dup(STDOUT_FILENO); |
1096 | err = dup(STDERR_FILENO); | |
8ce64345 | 1097 | |
1098 | if (in < 0 || out < 0 || err < 0) | |
14a9a859 | 1099 | fatal("dup() in/out/err failed"); |
8ce64345 | 1100 | |
a22aff1f | 1101 | /* enable nonblocking unless tty */ |
1102 | if (!isatty(in)) | |
1103 | set_nonblock(in); | |
1104 | if (!isatty(out)) | |
1105 | set_nonblock(out); | |
1106 | if (!isatty(err)) | |
1107 | set_nonblock(err); | |
1108 | ||
bcbf86ec | 1109 | window = CHAN_SES_WINDOW_DEFAULT; |
1110 | packetmax = CHAN_SES_PACKET_DEFAULT; | |
ea9700ba | 1111 | if (tty_flag) { |
1112 | window >>= 1; | |
1113 | packetmax >>= 1; | |
8ce64345 | 1114 | } |
719fc62f | 1115 | c = channel_new( |
8ce64345 | 1116 | "session", SSH_CHANNEL_OPENING, in, out, err, |
bcbf86ec | 1117 | window, packetmax, CHAN_EXTENDED_WRITE, |
0d942eff | 1118 | "client-session", /*nonblock*/0); |
8ce64345 | 1119 | |
bcdb96c2 | 1120 | debug3("ssh_session2_open: channel_new: %d", c->self); |
eb0dd41f | 1121 | |
36e1f6a1 | 1122 | channel_send_open(c->self); |
bcdb96c2 | 1123 | if (!no_shell_flag) |
05ca0898 | 1124 | channel_register_confirm(c->self, ssh_session2_setup); |
5260325f | 1125 | |
719fc62f | 1126 | return c->self; |
eb0dd41f | 1127 | } |
1128 | ||
396c147e | 1129 | static int |
eb0dd41f | 1130 | ssh_session2(void) |
1131 | { | |
bcdb96c2 | 1132 | int id = -1; |
eb0dd41f | 1133 | |
1134 | /* XXX should be pre-session */ | |
1135 | ssh_init_forwarding(); | |
1136 | ||
bcdb96c2 | 1137 | if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN)) |
1138 | id = ssh_session2_open(); | |
eb0dd41f | 1139 | |
1140 | /* If requested, let ssh continue in the background. */ | |
1141 | if (fork_after_authentication_flag) | |
1142 | if (daemon(1, 1) < 0) | |
1143 | fatal("daemon() failed: %.200s", strerror(errno)); | |
1144 | ||
4bf9c10e | 1145 | return client_loop(tty_flag, tty_flag ? |
1146 | options.escape_char : SSH_ESCAPECHAR_NONE, id); | |
8efc0c15 | 1147 | } |
fa08c86b | 1148 | |
396c147e | 1149 | static void |
fee56204 | 1150 | load_public_identity_files(void) |
1151 | { | |
1152 | char *filename; | |
2e23cde0 | 1153 | int i = 0; |
0659cace | 1154 | Key *public; |
383546c4 | 1155 | #ifdef SMARTCARD |
0659cace | 1156 | Key **keys; |
1157 | ||
9ff6f66f | 1158 | if (options.smartcard_device != NULL && |
0659cace | 1159 | options.num_identity_files < SSH_MAX_IDENTITY_FILES && |
1160 | (keys = sc_get_keys(options.smartcard_device, NULL)) != NULL ) { | |
1161 | int count = 0; | |
1162 | for (i = 0; keys[i] != NULL; i++) { | |
1163 | count++; | |
0659cace | 1164 | memmove(&options.identity_files[1], &options.identity_files[0], |
1165 | sizeof(char *) * (SSH_MAX_IDENTITY_FILES - 1)); | |
1166 | memmove(&options.identity_keys[1], &options.identity_keys[0], | |
1167 | sizeof(Key *) * (SSH_MAX_IDENTITY_FILES - 1)); | |
1168 | options.num_identity_files++; | |
1169 | options.identity_keys[0] = keys[i]; | |
244e796f | 1170 | options.identity_files[0] = sc_get_key_label(keys[i]); |
0659cace | 1171 | } |
1c2deed1 | 1172 | if (options.num_identity_files > SSH_MAX_IDENTITY_FILES) |
1173 | options.num_identity_files = SSH_MAX_IDENTITY_FILES; | |
0659cace | 1174 | i = count; |
1175 | xfree(keys); | |
383546c4 | 1176 | } |
3e984472 | 1177 | #endif /* SMARTCARD */ |
2e23cde0 | 1178 | for (; i < options.num_identity_files; i++) { |
1179 | filename = tilde_expand_filename(options.identity_files[i], | |
1180 | original_real_uid); | |
1181 | public = key_load_public(filename, NULL); | |
1182 | debug("identity file %s type %d", filename, | |
1183 | public ? public->type : -1); | |
1184 | xfree(options.identity_files[i]); | |
1185 | options.identity_files[i] = filename; | |
1186 | options.identity_keys[i] = public; | |
1187 | } | |
fee56204 | 1188 | } |