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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. | |
d73a67d7 | 16 | * Copyright (c) 2000, 2001, 2002, 2003 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" | |
f7926e97 | 43 | RCSID("$OpenBSD: ssh.c,v 1.204 2003/11/24 00:16:35 dtucker 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"); |
2b87da3b | 157 | fprintf(stderr, " -X Enable X11 connection forwarding.\n"); |
d73a67d7 | 158 | fprintf(stderr, " -Y Enable trusted 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 | |
fda04d7d | 215 | __progname = ssh_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(); | |
aff51935 | 224 | |
9f324470 | 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, | |
d73a67d7 | 268 | "1246ab:c:e:fgi:kl:m:no:p:qstvxACD:F:I:L:NPR:TVXY")) != -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; | |
d73a67d7 | 295 | case 'Y': |
296 | options.forward_x11 = 1; | |
297 | options.forward_x11_trusted = 1; | |
298 | break; | |
5260325f | 299 | case 'g': |
300 | options.gateway_ports = 1; | |
301 | break; | |
e59404d1 | 302 | case 'P': /* deprecated */ |
5260325f | 303 | options.use_privileged_port = 0; |
304 | break; | |
5260325f | 305 | case 'a': |
306 | options.forward_agent = 0; | |
307 | break; | |
71276795 | 308 | case 'A': |
309 | options.forward_agent = 1; | |
310 | break; | |
5260325f | 311 | case 'k': |
f7926e97 | 312 | options.gss_deleg_creds = 0; |
5260325f | 313 | break; |
5260325f | 314 | case 'i': |
315 | if (stat(optarg, &st) < 0) { | |
f5a1a01a | 316 | fprintf(stderr, "Warning: Identity file %s " |
317 | "does not exist.\n", optarg); | |
5260325f | 318 | break; |
319 | } | |
f5a1a01a | 320 | if (options.num_identity_files >= |
321 | SSH_MAX_IDENTITY_FILES) | |
322 | fatal("Too many identity files specified " | |
323 | "(max %d)", SSH_MAX_IDENTITY_FILES); | |
324 | options.identity_files[options.num_identity_files++] = | |
325 | xstrdup(optarg); | |
5260325f | 326 | break; |
383546c4 | 327 | case 'I': |
328 | #ifdef SMARTCARD | |
9ff6f66f | 329 | options.smartcard_device = xstrdup(optarg); |
dd2495cb | 330 | #else |
383546c4 | 331 | fprintf(stderr, "no support for smartcards.\n"); |
dd2495cb | 332 | #endif |
383546c4 | 333 | break; |
5260325f | 334 | case 't': |
8abcdba4 | 335 | if (tty_flag) |
336 | force_tty_flag = 1; | |
5260325f | 337 | tty_flag = 1; |
338 | break; | |
5260325f | 339 | case 'v': |
e053cd2c | 340 | if (debug_flag == 0) { |
bcbf86ec | 341 | debug_flag = 1; |
342 | options.log_level = SYSLOG_LEVEL_DEBUG1; | |
e053cd2c | 343 | } else { |
344 | if (options.log_level < SYSLOG_LEVEL_DEBUG3) | |
345 | options.log_level++; | |
bcbf86ec | 346 | break; |
e053cd2c | 347 | } |
bcbf86ec | 348 | /* fallthrough */ |
5260325f | 349 | case 'V': |
e68225b2 | 350 | fprintf(stderr, |
c936c243 | 351 | "%s, SSH protocols %d.%d/%d.%d, %s\n", |
a8be9f80 | 352 | SSH_VERSION, |
353 | PROTOCOL_MAJOR_1, PROTOCOL_MINOR_1, | |
e68225b2 | 354 | PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2, |
c936c243 | 355 | SSLeay_version(SSLEAY_VERSION)); |
5260325f | 356 | if (opt == 'V') |
357 | exit(0); | |
5260325f | 358 | break; |
5260325f | 359 | case 'q': |
360 | options.log_level = SYSLOG_LEVEL_QUIET; | |
361 | break; | |
5260325f | 362 | case 'e': |
363 | if (optarg[0] == '^' && optarg[2] == 0 && | |
f5a1a01a | 364 | (u_char) optarg[1] >= 64 && |
365 | (u_char) optarg[1] < 128) | |
1e3b8b07 | 366 | options.escape_char = (u_char) optarg[1] & 31; |
5260325f | 367 | else if (strlen(optarg) == 1) |
1e3b8b07 | 368 | options.escape_char = (u_char) optarg[0]; |
5260325f | 369 | else if (strcmp(optarg, "none") == 0) |
4bf9c10e | 370 | options.escape_char = SSH_ESCAPECHAR_NONE; |
5260325f | 371 | else { |
f5a1a01a | 372 | fprintf(stderr, "Bad escape character '%s'.\n", |
373 | optarg); | |
5260325f | 374 | exit(1); |
375 | } | |
376 | break; | |
5260325f | 377 | case 'c': |
a306f2dd | 378 | if (ciphers_valid(optarg)) { |
379 | /* SSH2 only */ | |
380 | options.ciphers = xstrdup(optarg); | |
d0c832f3 | 381 | options.cipher = SSH_CIPHER_ILLEGAL; |
a306f2dd | 382 | } else { |
383 | /* SSH1 only */ | |
c523303b | 384 | options.cipher = cipher_number(optarg); |
385 | if (options.cipher == -1) { | |
f5a1a01a | 386 | fprintf(stderr, |
387 | "Unknown cipher type '%s'\n", | |
388 | optarg); | |
a306f2dd | 389 | exit(1); |
390 | } | |
f5a1a01a | 391 | if (options.cipher == SSH_CIPHER_3DES) |
c523303b | 392 | options.ciphers = "3des-cbc"; |
f5a1a01a | 393 | else if (options.cipher == SSH_CIPHER_BLOWFISH) |
c523303b | 394 | options.ciphers = "blowfish-cbc"; |
f5a1a01a | 395 | else |
c523303b | 396 | options.ciphers = (char *)-1; |
5260325f | 397 | } |
398 | break; | |
b2552997 | 399 | case 'm': |
400 | if (mac_valid(optarg)) | |
401 | options.macs = xstrdup(optarg); | |
402 | else { | |
f5a1a01a | 403 | fprintf(stderr, "Unknown mac type '%s'\n", |
404 | optarg); | |
b2552997 | 405 | exit(1); |
406 | } | |
407 | break; | |
5260325f | 408 | case 'p': |
2d2a2c65 | 409 | options.port = a2port(optarg); |
410 | if (options.port == 0) { | |
6031af8d | 411 | fprintf(stderr, "Bad port '%s'\n", optarg); |
412 | exit(1); | |
413 | } | |
5260325f | 414 | break; |
5260325f | 415 | case 'l': |
416 | options.user = optarg; | |
417 | break; | |
d2e3df16 | 418 | |
419 | case 'L': | |
5260325f | 420 | case 'R': |
fa065de2 | 421 | if (sscanf(optarg, "%5[0123456789]:%255[^:]:%5[0123456789]", |
d2e3df16 | 422 | sfwd_port, buf, sfwd_host_port) != 3 && |
fa065de2 | 423 | sscanf(optarg, "%5[0123456789]/%255[^/]/%5[0123456789]", |
d2e3df16 | 424 | sfwd_port, buf, sfwd_host_port) != 3) { |
f5a1a01a | 425 | fprintf(stderr, |
d2e3df16 | 426 | "Bad forwarding specification '%s'\n", |
f5a1a01a | 427 | optarg); |
5260325f | 428 | usage(); |
429 | /* NOTREACHED */ | |
430 | } | |
d2e3df16 | 431 | if ((fwd_port = a2port(sfwd_port)) == 0 || |
762715ce | 432 | (fwd_host_port = a2port(sfwd_host_port)) == 0) { |
f5a1a01a | 433 | fprintf(stderr, |
d2e3df16 | 434 | "Bad forwarding port(s) '%s'\n", optarg); |
435 | exit(1); | |
5260325f | 436 | } |
d2e3df16 | 437 | if (opt == 'L') |
438 | add_local_forward(&options, fwd_port, buf, | |
439 | fwd_host_port); | |
440 | else if (opt == 'R') | |
441 | add_remote_forward(&options, fwd_port, buf, | |
184eed6a | 442 | fwd_host_port); |
5260325f | 443 | break; |
0490e609 | 444 | |
445 | case 'D': | |
2d2a2c65 | 446 | fwd_port = a2port(optarg); |
447 | if (fwd_port == 0) { | |
f5a1a01a | 448 | fprintf(stderr, "Bad dynamic port '%s'\n", |
449 | optarg); | |
6031af8d | 450 | exit(1); |
451 | } | |
37ba5172 | 452 | add_local_forward(&options, fwd_port, "socks", 0); |
0490e609 | 453 | break; |
454 | ||
5260325f | 455 | case 'C': |
456 | options.compression = 1; | |
457 | break; | |
8ce64345 | 458 | case 'N': |
459 | no_shell_flag = 1; | |
460 | no_tty_flag = 1; | |
461 | break; | |
8ce64345 | 462 | case 'T': |
463 | no_tty_flag = 1; | |
464 | break; | |
5260325f | 465 | case 'o': |
466 | dummy = 1; | |
f5a1a01a | 467 | if (process_config_line(&options, host ? host : "", |
468 | optarg, "command-line", 0, &dummy) != 0) | |
5260325f | 469 | exit(1); |
470 | break; | |
ae810de7 | 471 | case 's': |
472 | subsystem_flag = 1; | |
473 | break; | |
3435f5a6 | 474 | case 'b': |
475 | options.bind_address = optarg; | |
476 | break; | |
e591b98a | 477 | case 'F': |
478 | config = optarg; | |
479 | break; | |
5260325f | 480 | default: |
481 | usage(); | |
482 | } | |
483 | } | |
484 | ||
f5a1a01a | 485 | ac -= optind; |
486 | av += optind; | |
487 | ||
488 | if (ac > 0 && !host && **av != '-') { | |
15748b4d | 489 | if (strrchr(*av, '@')) { |
f5a1a01a | 490 | p = xstrdup(*av); |
15748b4d | 491 | cp = strrchr(p, '@'); |
f5a1a01a | 492 | if (cp == NULL || cp == p) |
493 | usage(); | |
494 | options.user = p; | |
495 | *cp = '\0'; | |
496 | host = ++cp; | |
497 | } else | |
498 | host = *av; | |
978ebf99 | 499 | if (ac > 1) { |
500 | optind = optreset = 1; | |
f5a1a01a | 501 | goto again; |
502 | } | |
978ebf99 | 503 | ac--, av++; |
f5a1a01a | 504 | } |
505 | ||
5260325f | 506 | /* Check that we got a host name. */ |
507 | if (!host) | |
8efc0c15 | 508 | usage(); |
5260325f | 509 | |
22d89d24 | 510 | SSLeay_add_all_algorithms(); |
fa08c86b | 511 | ERR_load_crypto_strings(); |
22d89d24 | 512 | |
5260325f | 513 | /* Initialize the command to execute on remote host. */ |
514 | buffer_init(&command); | |
515 | ||
aa3378df | 516 | /* |
517 | * Save the command to execute on the remote host in a buffer. There | |
518 | * is no limit on the length of the command, except by the maximum | |
519 | * packet size. Also sets the tty flag if there is no command. | |
520 | */ | |
f5a1a01a | 521 | if (!ac) { |
5260325f | 522 | /* No command specified - execute shell on a tty. */ |
523 | tty_flag = 1; | |
ae810de7 | 524 | if (subsystem_flag) { |
f5a1a01a | 525 | fprintf(stderr, |
526 | "You must specify a subsystem to invoke.\n"); | |
ae810de7 | 527 | usage(); |
528 | } | |
5260325f | 529 | } else { |
f5a1a01a | 530 | /* A command has been specified. Store it into the buffer. */ |
531 | for (i = 0; i < ac; i++) { | |
532 | if (i) | |
5260325f | 533 | buffer_append(&command, " ", 1); |
534 | buffer_append(&command, av[i], strlen(av[i])); | |
535 | } | |
8efc0c15 | 536 | } |
5260325f | 537 | |
538 | /* Cannot fork to background if no command. */ | |
14a9a859 | 539 | if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag) |
5260325f | 540 | fatal("Cannot fork into background without a command to execute."); |
541 | ||
542 | /* Allocate a tty by default if no command specified. */ | |
543 | if (buffer_len(&command) == 0) | |
544 | tty_flag = 1; | |
545 | ||
343288b8 | 546 | /* Force no tty */ |
0b6fbf03 | 547 | if (no_tty_flag) |
548 | tty_flag = 0; | |
5260325f | 549 | /* Do not allocate a tty if stdin is not a tty. */ |
8abcdba4 | 550 | if (!isatty(fileno(stdin)) && !force_tty_flag) { |
5260325f | 551 | if (tty_flag) |
bbe88b6d | 552 | logit("Pseudo-terminal will not be allocated because stdin is not a terminal."); |
5260325f | 553 | tty_flag = 0; |
554 | } | |
8ce64345 | 555 | |
20244695 | 556 | /* |
557 | * Initialize "log" output. Since we are the client all output | |
558 | * actually goes to stderr. | |
559 | */ | |
cc44f691 | 560 | log_init(av[0], options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level, |
561 | SYSLOG_FACILITY_USER, 1); | |
5260325f | 562 | |
e591b98a | 563 | /* |
564 | * Read per-user configuration file. Ignore the system wide config | |
565 | * file if the user specifies a config file on the command line. | |
566 | */ | |
567 | if (config != NULL) { | |
93111dfa | 568 | if (!read_config_file(config, host, &options)) |
569 | fatal("Can't open user config file %.100s: " | |
570 | "%.100s", config, strerror(errno)); | |
e591b98a | 571 | } else { |
572 | snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, | |
573 | _PATH_SSH_USER_CONFFILE); | |
f67792f2 | 574 | (void)read_config_file(buf, host, &options); |
e591b98a | 575 | |
f67792f2 | 576 | /* Read systemwide configuration file after use config. */ |
93111dfa | 577 | (void)read_config_file(_PATH_HOST_CONFIG_FILE, host, &options); |
e591b98a | 578 | } |
5260325f | 579 | |
580 | /* Fill configuration defaults. */ | |
581 | fill_default_options(&options); | |
582 | ||
1572b90f | 583 | channel_set_af(options.address_family); |
584 | ||
5260325f | 585 | /* reinit */ |
20244695 | 586 | log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 1); |
5260325f | 587 | |
e339aa53 | 588 | seed_rng(); |
589 | ||
5260325f | 590 | if (options.user == NULL) |
591 | options.user = xstrdup(pw->pw_name); | |
592 | ||
593 | if (options.hostname != NULL) | |
594 | host = options.hostname; | |
595 | ||
03c82656 | 596 | /* force lowercase for hostkey matching */ |
597 | if (options.host_key_alias != NULL) { | |
598 | for (p = options.host_key_alias; *p; p++) | |
599 | if (isupper(*p)) | |
600 | *p = tolower(*p); | |
601 | } | |
602 | ||
f78bde70 | 603 | if (options.proxy_command != NULL && |
604 | strcmp(options.proxy_command, "none") == 0) | |
605 | options.proxy_command = NULL; | |
606 | ||
6ffc9c88 | 607 | /* Open a connection to the remote host. */ |
1572b90f | 608 | if (ssh_connect(host, &hostaddr, options.port, |
609 | options.address_family, options.connection_attempts, | |
d514c907 | 610 | #ifdef HAVE_CYGWIN |
611 | options.use_privileged_port, | |
612 | #else | |
3fb156df | 613 | original_effective_uid == 0 && options.use_privileged_port, |
d514c907 | 614 | #endif |
de60473e | 615 | options.proxy_command) != 0) |
b34bec32 | 616 | exit(1); |
5260325f | 617 | |
aa3378df | 618 | /* |
619 | * If we successfully made the connection, load the host private key | |
620 | * in case we will need it later for combined rsa-rhosts | |
621 | * authentication. This must be done before releasing extra | |
622 | * privileges, because the file is only readable by root. | |
78660ed4 | 623 | * If we cannot access the private keys, load the public keys |
624 | * instead and try to execute the ssh-keysign helper instead. | |
aa3378df | 625 | */ |
8002af61 | 626 | sensitive_data.nkeys = 0; |
627 | sensitive_data.keys = NULL; | |
39c00dc2 | 628 | sensitive_data.external_keysign = 0; |
b34bec32 | 629 | if (options.rhosts_rsa_authentication || |
630 | options.hostbased_authentication) { | |
8002af61 | 631 | sensitive_data.nkeys = 3; |
343288b8 | 632 | sensitive_data.keys = xmalloc(sensitive_data.nkeys * |
633 | sizeof(Key)); | |
3fb156df | 634 | |
635 | PRIV_START; | |
8002af61 | 636 | sensitive_data.keys[0] = key_load_private_type(KEY_RSA1, |
aeaa3d9e | 637 | _PATH_HOST_KEY_FILE, "", NULL); |
8002af61 | 638 | sensitive_data.keys[1] = key_load_private_type(KEY_DSA, |
639 | _PATH_HOST_DSA_KEY_FILE, "", NULL); | |
640 | sensitive_data.keys[2] = key_load_private_type(KEY_RSA, | |
641 | _PATH_HOST_RSA_KEY_FILE, "", NULL); | |
3fb156df | 642 | PRIV_END; |
39c00dc2 | 643 | |
60cd0a97 | 644 | if (options.hostbased_authentication == 1 && |
645 | sensitive_data.keys[0] == NULL && | |
39c00dc2 | 646 | sensitive_data.keys[1] == NULL && |
647 | sensitive_data.keys[2] == NULL) { | |
648 | sensitive_data.keys[1] = key_load_public( | |
649 | _PATH_HOST_DSA_KEY_FILE, NULL); | |
650 | sensitive_data.keys[2] = key_load_public( | |
651 | _PATH_HOST_RSA_KEY_FILE, NULL); | |
652 | sensitive_data.external_keysign = 1; | |
653 | } | |
5260325f | 654 | } |
aa3378df | 655 | /* |
656 | * Get rid of any extra privileges that we may have. We will no | |
657 | * longer need them. Also, extra privileges could make it very hard | |
658 | * to read identity files and other non-world-readable files from the | |
659 | * user's home directory if it happens to be on a NFS volume where | |
660 | * root is mapped to nobody. | |
661 | */ | |
3fb156df | 662 | seteuid(original_real_uid); |
663 | setuid(original_real_uid); | |
5260325f | 664 | |
aa3378df | 665 | /* |
666 | * Now that we are back to our own permissions, create ~/.ssh | |
667 | * directory if it doesn\'t already exist. | |
668 | */ | |
c3abff07 | 669 | snprintf(buf, sizeof buf, "%.100s%s%.100s", pw->pw_dir, strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR); |
5260325f | 670 | if (stat(buf, &st) < 0) |
704b1659 | 671 | if (mkdir(buf, 0700) < 0) |
5260325f | 672 | error("Could not create directory '%.200s'.", buf); |
673 | ||
fee56204 | 674 | /* load options.identity_files */ |
675 | load_public_identity_files(); | |
676 | ||
677 | /* Expand ~ in known host file names. */ | |
678 | /* XXX mem-leaks: */ | |
fa08c86b | 679 | options.system_hostfile = |
680 | tilde_expand_filename(options.system_hostfile, original_real_uid); | |
681 | options.user_hostfile = | |
682 | tilde_expand_filename(options.user_hostfile, original_real_uid); | |
683 | options.system_hostfile2 = | |
684 | tilde_expand_filename(options.system_hostfile2, original_real_uid); | |
685 | options.user_hostfile2 = | |
686 | tilde_expand_filename(options.user_hostfile2, original_real_uid); | |
5260325f | 687 | |
67b75437 | 688 | signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */ |
689 | ||
5260325f | 690 | /* Log into the remote system. This never returns if the login fails. */ |
39c00dc2 | 691 | ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr, pw); |
8002af61 | 692 | |
693 | /* We no longer need the private host keys. Clear them now. */ | |
694 | if (sensitive_data.nkeys != 0) { | |
695 | for (i = 0; i < sensitive_data.nkeys; i++) { | |
696 | if (sensitive_data.keys[i] != NULL) { | |
697 | /* Destroys contents safely */ | |
698 | debug3("clear hostkey %d", i); | |
699 | key_free(sensitive_data.keys[i]); | |
700 | sensitive_data.keys[i] = NULL; | |
701 | } | |
702 | } | |
703 | xfree(sensitive_data.keys); | |
704 | } | |
05b7537a | 705 | for (i = 0; i < options.num_identity_files; i++) { |
706 | if (options.identity_files[i]) { | |
707 | xfree(options.identity_files[i]); | |
708 | options.identity_files[i] = NULL; | |
709 | } | |
710 | if (options.identity_keys[i]) { | |
711 | key_free(options.identity_keys[i]); | |
712 | options.identity_keys[i] = NULL; | |
713 | } | |
714 | } | |
5260325f | 715 | |
8ce64345 | 716 | exit_status = compat20 ? ssh_session2() : ssh_session(); |
717 | packet_close(); | |
6939bbd4 | 718 | |
719 | /* | |
aff51935 | 720 | * Send SIGHUP to proxy command if used. We don't wait() in |
6939bbd4 | 721 | * case it hangs and instead rely on init to reap the child |
722 | */ | |
723 | if (proxy_command_pid > 1) | |
724 | kill(proxy_command_pid, SIGHUP); | |
725 | ||
8ce64345 | 726 | return exit_status; |
727 | } | |
728 | ||
d73a67d7 | 729 | #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1" |
730 | ||
396c147e | 731 | static void |
b48eeb07 | 732 | x11_get_proto(char **_proto, char **_data) |
0b242b12 | 733 | { |
d73a67d7 | 734 | char cmd[1024]; |
0b242b12 | 735 | char line[512]; |
d73a67d7 | 736 | char xdisplay[512]; |
b48eeb07 | 737 | static char proto[512], data[512]; |
0b242b12 | 738 | FILE *f; |
d73a67d7 | 739 | int got_data = 0, generated = 0, do_unlink = 0, i; |
740 | char *display, *xauthdir, *xauthfile; | |
5d185586 | 741 | struct stat st; |
0b242b12 | 742 | |
d73a67d7 | 743 | xauthdir = xauthfile = NULL; |
b48eeb07 | 744 | *_proto = proto; |
745 | *_data = data; | |
746 | proto[0] = data[0] = '\0'; | |
d73a67d7 | 747 | |
5d185586 | 748 | if (!options.xauth_location || |
749 | (stat(options.xauth_location, &st) == -1)) { | |
750 | debug("No xauth program."); | |
751 | } else { | |
752 | if ((display = getenv("DISPLAY")) == NULL) { | |
753 | debug("x11_get_proto: DISPLAY not set"); | |
754 | return; | |
755 | } | |
d73a67d7 | 756 | /* |
757 | * Handle FamilyLocal case where $DISPLAY does | |
758 | * not match an authorization entry. For this we | |
759 | * just try "xauth list unix:displaynum.screennum". | |
760 | * XXX: "localhost" match to determine FamilyLocal | |
761 | * is not perfect. | |
762 | */ | |
763 | if (strncmp(display, "localhost:", 10) == 0) { | |
764 | snprintf(xdisplay, sizeof(xdisplay), "unix:%s", | |
765 | display + 10); | |
766 | display = xdisplay; | |
767 | } | |
768 | if (options.forward_x11_trusted == 0) { | |
769 | xauthdir = xmalloc(MAXPATHLEN); | |
770 | xauthfile = xmalloc(MAXPATHLEN); | |
771 | strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN); | |
772 | if (mkdtemp(xauthdir) != NULL) { | |
773 | do_unlink = 1; | |
774 | snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile", | |
775 | xauthdir); | |
776 | snprintf(cmd, sizeof(cmd), | |
777 | "%s -f %s generate %s " SSH_X11_PROTO | |
778 | " untrusted timeout 120 2>" _PATH_DEVNULL, | |
779 | options.xauth_location, xauthfile, display); | |
780 | debug2("x11_get_proto: %s", cmd); | |
781 | if (system(cmd) == 0) | |
782 | generated = 1; | |
783 | } | |
784 | } | |
785 | snprintf(cmd, sizeof(cmd), | |
786 | "%s %s%s list %s . 2>" _PATH_DEVNULL, | |
787 | options.xauth_location, | |
788 | generated ? "-f " : "" , | |
789 | generated ? xauthfile : "", | |
790 | display); | |
791 | debug2("x11_get_proto: %s", cmd); | |
792 | f = popen(cmd, "r"); | |
fa649821 | 793 | if (f && fgets(line, sizeof(line), f) && |
b48eeb07 | 794 | sscanf(line, "%*s %511s %511s", proto, data) == 2) |
fa649821 | 795 | got_data = 1; |
796 | if (f) | |
797 | pclose(f); | |
798 | } | |
d73a67d7 | 799 | |
800 | if (do_unlink) { | |
801 | unlink(xauthfile); | |
802 | rmdir(xauthdir); | |
803 | } | |
804 | if (xauthdir) | |
805 | xfree(xauthdir); | |
806 | if (xauthfile) | |
807 | xfree(xauthfile); | |
808 | ||
0b242b12 | 809 | /* |
810 | * If we didn't get authentication data, just make up some | |
811 | * data. The forwarding code will check the validity of the | |
812 | * response anyway, and substitute this data. The X11 | |
813 | * server, however, will ignore this fake data and use | |
814 | * whatever authentication mechanisms it was using otherwise | |
815 | * for the local connection. | |
816 | */ | |
817 | if (!got_data) { | |
818 | u_int32_t rand = 0; | |
819 | ||
d73a67d7 | 820 | logit("Warning: No xauth data; " |
821 | "using fake authentication data for X11 forwarding."); | |
822 | strlcpy(proto, SSH_X11_PROTO, sizeof proto); | |
0b242b12 | 823 | for (i = 0; i < 16; i++) { |
824 | if (i % 4 == 0) | |
825 | rand = arc4random(); | |
d73a67d7 | 826 | snprintf(data + 2 * i, sizeof data - 2 * i, "%02x", |
827 | rand & 0xff); | |
0b242b12 | 828 | rand >>= 8; |
829 | } | |
830 | } | |
831 | } | |
832 | ||
396c147e | 833 | static void |
fa08c86b | 834 | ssh_init_forwarding(void) |
835 | { | |
02a024dd | 836 | int success = 0; |
fa08c86b | 837 | int i; |
02a024dd | 838 | |
fa08c86b | 839 | /* Initiate local TCP/IP port forwardings. */ |
840 | for (i = 0; i < options.num_local_forwards; i++) { | |
841 | debug("Connections to local port %d forwarded to remote address %.200s:%d", | |
842 | options.local_forwards[i].port, | |
843 | options.local_forwards[i].host, | |
844 | options.local_forwards[i].host_port); | |
5641aefa | 845 | success += channel_setup_local_fwd_listener( |
fa08c86b | 846 | options.local_forwards[i].port, |
847 | options.local_forwards[i].host, | |
848 | options.local_forwards[i].host_port, | |
849 | options.gateway_ports); | |
850 | } | |
02a024dd | 851 | if (i > 0 && success == 0) |
852 | error("Could not request local forwarding."); | |
fa08c86b | 853 | |
854 | /* Initiate remote TCP/IP port forwardings. */ | |
855 | for (i = 0; i < options.num_remote_forwards; i++) { | |
856 | debug("Connections to remote port %d forwarded to local address %.200s:%d", | |
857 | options.remote_forwards[i].port, | |
858 | options.remote_forwards[i].host, | |
859 | options.remote_forwards[i].host_port); | |
860 | channel_request_remote_forwarding( | |
861 | options.remote_forwards[i].port, | |
862 | options.remote_forwards[i].host, | |
863 | options.remote_forwards[i].host_port); | |
864 | } | |
865 | } | |
866 | ||
396c147e | 867 | static void |
fa08c86b | 868 | check_agent_present(void) |
869 | { | |
870 | if (options.forward_agent) { | |
871 | /* Clear agent forwarding if we don\'t have an agent. */ | |
8b10e20e | 872 | if (!ssh_agent_present()) |
fa08c86b | 873 | options.forward_agent = 0; |
fa08c86b | 874 | } |
875 | } | |
876 | ||
396c147e | 877 | static int |
8ce64345 | 878 | ssh_session(void) |
879 | { | |
880 | int type; | |
8ce64345 | 881 | int interactive = 0; |
882 | int have_tty = 0; | |
883 | struct winsize ws; | |
8ce64345 | 884 | char *cp; |
885 | ||
5260325f | 886 | /* Enable compression if requested. */ |
887 | if (options.compression) { | |
888 | debug("Requesting compression at level %d.", options.compression_level); | |
889 | ||
890 | if (options.compression_level < 1 || options.compression_level > 9) | |
891 | fatal("Compression level must be from 1 (fast) to 9 (slow, best)."); | |
892 | ||
893 | /* Send the request. */ | |
894 | packet_start(SSH_CMSG_REQUEST_COMPRESSION); | |
895 | packet_put_int(options.compression_level); | |
896 | packet_send(); | |
897 | packet_write_wait(); | |
54a5250f | 898 | type = packet_read(); |
5260325f | 899 | if (type == SSH_SMSG_SUCCESS) |
900 | packet_start_compression(options.compression_level); | |
901 | else if (type == SSH_SMSG_FAILURE) | |
bbe88b6d | 902 | logit("Warning: Remote host refused compression."); |
5260325f | 903 | else |
904 | packet_disconnect("Protocol error waiting for compression response."); | |
905 | } | |
906 | /* Allocate a pseudo tty if appropriate. */ | |
907 | if (tty_flag) { | |
908 | debug("Requesting pty."); | |
909 | ||
910 | /* Start the packet. */ | |
911 | packet_start(SSH_CMSG_REQUEST_PTY); | |
912 | ||
913 | /* Store TERM in the packet. There is no limit on the | |
914 | length of the string. */ | |
915 | cp = getenv("TERM"); | |
916 | if (!cp) | |
917 | cp = ""; | |
449c5ba5 | 918 | packet_put_cstring(cp); |
5260325f | 919 | |
920 | /* Store window size in the packet. */ | |
921 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) | |
922 | memset(&ws, 0, sizeof(ws)); | |
923 | packet_put_int(ws.ws_row); | |
924 | packet_put_int(ws.ws_col); | |
925 | packet_put_int(ws.ws_xpixel); | |
926 | packet_put_int(ws.ws_ypixel); | |
927 | ||
928 | /* Store tty modes in the packet. */ | |
30dcc918 | 929 | tty_make_modes(fileno(stdin), NULL); |
5260325f | 930 | |
931 | /* Send the packet, and wait for it to leave. */ | |
932 | packet_send(); | |
933 | packet_write_wait(); | |
934 | ||
935 | /* Read response from the server. */ | |
54a5250f | 936 | type = packet_read(); |
4fe2af09 | 937 | if (type == SSH_SMSG_SUCCESS) { |
5260325f | 938 | interactive = 1; |
8ce64345 | 939 | have_tty = 1; |
4fe2af09 | 940 | } else if (type == SSH_SMSG_FAILURE) |
bbe88b6d | 941 | logit("Warning: Remote host failed or refused to allocate a pseudo tty."); |
5260325f | 942 | else |
943 | packet_disconnect("Protocol error waiting for pty request response."); | |
944 | } | |
945 | /* Request X11 forwarding if enabled and DISPLAY is set. */ | |
946 | if (options.forward_x11 && getenv("DISPLAY") != NULL) { | |
b48eeb07 | 947 | char *proto, *data; |
0b242b12 | 948 | /* Get reasonable local authentication information. */ |
b48eeb07 | 949 | x11_get_proto(&proto, &data); |
0b242b12 | 950 | /* Request forwarding with authentication spoofing. */ |
5260325f | 951 | debug("Requesting X11 forwarding with authentication spoofing."); |
0b242b12 | 952 | x11_request_forwarding_with_spoofing(0, proto, data); |
5260325f | 953 | |
954 | /* Read response from the server. */ | |
54a5250f | 955 | type = packet_read(); |
5260325f | 956 | if (type == SSH_SMSG_SUCCESS) { |
5260325f | 957 | interactive = 1; |
0b242b12 | 958 | } else if (type == SSH_SMSG_FAILURE) { |
bbe88b6d | 959 | logit("Warning: Remote host denied X11 forwarding."); |
0b242b12 | 960 | } else { |
5260325f | 961 | packet_disconnect("Protocol error waiting for X11 forwarding"); |
0b242b12 | 962 | } |
5260325f | 963 | } |
964 | /* Tell the packet module whether this is an interactive session. */ | |
b5c334cc | 965 | packet_set_interactive(interactive); |
5260325f | 966 | |
967 | /* Request authentication agent forwarding if appropriate. */ | |
fa08c86b | 968 | check_agent_present(); |
969 | ||
5260325f | 970 | if (options.forward_agent) { |
971 | debug("Requesting authentication agent forwarding."); | |
972 | auth_request_forwarding(); | |
973 | ||
974 | /* Read response from the server. */ | |
54a5250f | 975 | type = packet_read(); |
95500969 | 976 | packet_check_eom(); |
5260325f | 977 | if (type != SSH_SMSG_SUCCESS) |
bbe88b6d | 978 | logit("Warning: Remote host denied authentication agent forwarding."); |
5260325f | 979 | } |
8efc0c15 | 980 | |
fa08c86b | 981 | /* Initiate port forwardings. */ |
982 | ssh_init_forwarding(); | |
5260325f | 983 | |
aa3378df | 984 | /* If requested, let ssh continue in the background. */ |
6ae2364d | 985 | if (fork_after_authentication_flag) |
aa3378df | 986 | if (daemon(1, 1) < 0) |
987 | fatal("daemon() failed: %.200s", strerror(errno)); | |
988 | ||
989 | /* | |
990 | * If a command was specified on the command line, execute the | |
991 | * command now. Otherwise request the server to start a shell. | |
992 | */ | |
5260325f | 993 | if (buffer_len(&command) > 0) { |
994 | int len = buffer_len(&command); | |
995 | if (len > 900) | |
996 | len = 900; | |
6c0fa2b1 | 997 | debug("Sending command: %.*s", len, (u_char *)buffer_ptr(&command)); |
5260325f | 998 | packet_start(SSH_CMSG_EXEC_CMD); |
999 | packet_put_string(buffer_ptr(&command), buffer_len(&command)); | |
1000 | packet_send(); | |
1001 | packet_write_wait(); | |
1002 | } else { | |
1003 | debug("Requesting shell."); | |
1004 | packet_start(SSH_CMSG_EXEC_SHELL); | |
1005 | packet_send(); | |
1006 | packet_write_wait(); | |
1007 | } | |
1008 | ||
1009 | /* Enter the interactive session. */ | |
4bf9c10e | 1010 | return client_loop(have_tty, tty_flag ? |
1011 | options.escape_char : SSH_ESCAPECHAR_NONE, 0); | |
8ce64345 | 1012 | } |
5260325f | 1013 | |
396c147e | 1014 | static void |
7819b5c3 | 1015 | client_subsystem_reply(int type, u_int32_t seq, void *ctxt) |
1f3bf5aa | 1016 | { |
1017 | int id, len; | |
1018 | ||
1019 | id = packet_get_int(); | |
1020 | len = buffer_len(&command); | |
ce91d6f8 | 1021 | if (len > 900) |
1022 | len = 900; | |
95500969 | 1023 | packet_check_eom(); |
1f3bf5aa | 1024 | if (type == SSH2_MSG_CHANNEL_FAILURE) |
1025 | fatal("Request for subsystem '%.*s' failed on channel %d", | |
6c0fa2b1 | 1026 | len, (u_char *)buffer_ptr(&command), id); |
1f3bf5aa | 1027 | } |
1028 | ||
e0ae8728 | 1029 | void |
1030 | client_global_request_reply(int type, u_int32_t seq, void *ctxt) | |
1031 | { | |
1032 | int i; | |
1033 | ||
1034 | i = client_global_request_id++; | |
1035 | if (i >= options.num_remote_forwards) { | |
1036 | debug("client_global_request_reply: too many replies %d > %d", | |
1037 | i, options.num_remote_forwards); | |
1038 | return; | |
1039 | } | |
1040 | debug("remote forward %s for: listen %d, connect %s:%d", | |
1041 | type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure", | |
1042 | options.remote_forwards[i].port, | |
1043 | options.remote_forwards[i].host, | |
1044 | options.remote_forwards[i].host_port); | |
1045 | if (type == SSH2_MSG_REQUEST_FAILURE) | |
bbe88b6d | 1046 | logit("Warning: remote port forwarding failed for listen port %d", |
e0ae8728 | 1047 | options.remote_forwards[i].port); |
1048 | } | |
1049 | ||
bcdb96c2 | 1050 | /* request pty/x11/agent/tcpfwd/shell for channel */ |
396c147e | 1051 | static void |
bcdb96c2 | 1052 | ssh_session2_setup(int id, void *arg) |
8ce64345 | 1053 | { |
1054 | int len; | |
b5c334cc | 1055 | int interactive = 0; |
30dcc918 | 1056 | struct termios tio; |
b5c334cc | 1057 | |
83bbc162 | 1058 | debug2("ssh_session2_setup: id %d", id); |
8ce64345 | 1059 | |
8ce64345 | 1060 | if (tty_flag) { |
1061 | struct winsize ws; | |
1062 | char *cp; | |
1063 | cp = getenv("TERM"); | |
1064 | if (!cp) | |
1065 | cp = ""; | |
1066 | /* Store window size in the packet. */ | |
1067 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) | |
1068 | memset(&ws, 0, sizeof(ws)); | |
1069 | ||
1070 | channel_request_start(id, "pty-req", 0); | |
1071 | packet_put_cstring(cp); | |
1072 | packet_put_int(ws.ws_col); | |
1073 | packet_put_int(ws.ws_row); | |
1074 | packet_put_int(ws.ws_xpixel); | |
1075 | packet_put_int(ws.ws_ypixel); | |
30dcc918 | 1076 | tio = get_saved_tio(); |
1077 | tty_make_modes(/*ignored*/ 0, &tio); | |
8ce64345 | 1078 | packet_send(); |
b5c334cc | 1079 | interactive = 1; |
8ce64345 | 1080 | /* XXX wait for reply */ |
1081 | } | |
0b242b12 | 1082 | if (options.forward_x11 && |
1083 | getenv("DISPLAY") != NULL) { | |
b48eeb07 | 1084 | char *proto, *data; |
0b242b12 | 1085 | /* Get reasonable local authentication information. */ |
b48eeb07 | 1086 | x11_get_proto(&proto, &data); |
0b242b12 | 1087 | /* Request forwarding with authentication spoofing. */ |
1088 | debug("Requesting X11 forwarding with authentication spoofing."); | |
1089 | x11_request_forwarding_with_spoofing(id, proto, data); | |
b5c334cc | 1090 | interactive = 1; |
0b242b12 | 1091 | /* XXX wait for reply */ |
1092 | } | |
1093 | ||
fa08c86b | 1094 | check_agent_present(); |
1095 | if (options.forward_agent) { | |
1096 | debug("Requesting authentication agent forwarding."); | |
1097 | channel_request_start(id, "auth-agent-req@openssh.com", 0); | |
1098 | packet_send(); | |
1099 | } | |
1100 | ||
8ce64345 | 1101 | len = buffer_len(&command); |
1102 | if (len > 0) { | |
1103 | if (len > 900) | |
1104 | len = 900; | |
ae810de7 | 1105 | if (subsystem_flag) { |
6c0fa2b1 | 1106 | debug("Sending subsystem: %.*s", len, (u_char *)buffer_ptr(&command)); |
1f3bf5aa | 1107 | channel_request_start(id, "subsystem", /*want reply*/ 1); |
1108 | /* register callback for reply */ | |
c242fc96 | 1109 | /* XXX we assume that client_loop has already been called */ |
1f3bf5aa | 1110 | dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &client_subsystem_reply); |
1111 | dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &client_subsystem_reply); | |
ae810de7 | 1112 | } else { |
6c0fa2b1 | 1113 | debug("Sending command: %.*s", len, (u_char *)buffer_ptr(&command)); |
ae810de7 | 1114 | channel_request_start(id, "exec", 0); |
1115 | } | |
ce91d6f8 | 1116 | packet_put_string(buffer_ptr(&command), buffer_len(&command)); |
8ce64345 | 1117 | packet_send(); |
1118 | } else { | |
06ee33fb | 1119 | channel_request_start(id, "shell", 0); |
1120 | packet_send(); | |
8ce64345 | 1121 | } |
1f3bf5aa | 1122 | |
b5c334cc | 1123 | packet_set_interactive(interactive); |
8ce64345 | 1124 | } |
1125 | ||
bcdb96c2 | 1126 | /* open new channel for a session */ |
396c147e | 1127 | static int |
bcdb96c2 | 1128 | ssh_session2_open(void) |
8ce64345 | 1129 | { |
719fc62f | 1130 | Channel *c; |
1131 | int window, packetmax, in, out, err; | |
2e73a022 | 1132 | |
14a9a859 | 1133 | if (stdin_null_flag) { |
5ca51e19 | 1134 | in = open(_PATH_DEVNULL, O_RDONLY); |
14a9a859 | 1135 | } else { |
1136 | in = dup(STDIN_FILENO); | |
1137 | } | |
2e73a022 | 1138 | out = dup(STDOUT_FILENO); |
1139 | err = dup(STDERR_FILENO); | |
8ce64345 | 1140 | |
1141 | if (in < 0 || out < 0 || err < 0) | |
14a9a859 | 1142 | fatal("dup() in/out/err failed"); |
8ce64345 | 1143 | |
a22aff1f | 1144 | /* enable nonblocking unless tty */ |
1145 | if (!isatty(in)) | |
1146 | set_nonblock(in); | |
1147 | if (!isatty(out)) | |
1148 | set_nonblock(out); | |
1149 | if (!isatty(err)) | |
1150 | set_nonblock(err); | |
1151 | ||
bcbf86ec | 1152 | window = CHAN_SES_WINDOW_DEFAULT; |
1153 | packetmax = CHAN_SES_PACKET_DEFAULT; | |
ea9700ba | 1154 | if (tty_flag) { |
1155 | window >>= 1; | |
1156 | packetmax >>= 1; | |
8ce64345 | 1157 | } |
719fc62f | 1158 | c = channel_new( |
8ce64345 | 1159 | "session", SSH_CHANNEL_OPENING, in, out, err, |
bcbf86ec | 1160 | window, packetmax, CHAN_EXTENDED_WRITE, |
0d942eff | 1161 | "client-session", /*nonblock*/0); |
8ce64345 | 1162 | |
bcdb96c2 | 1163 | debug3("ssh_session2_open: channel_new: %d", c->self); |
eb0dd41f | 1164 | |
36e1f6a1 | 1165 | channel_send_open(c->self); |
bcdb96c2 | 1166 | if (!no_shell_flag) |
05ca0898 | 1167 | channel_register_confirm(c->self, ssh_session2_setup); |
5260325f | 1168 | |
719fc62f | 1169 | return c->self; |
eb0dd41f | 1170 | } |
1171 | ||
396c147e | 1172 | static int |
eb0dd41f | 1173 | ssh_session2(void) |
1174 | { | |
bcdb96c2 | 1175 | int id = -1; |
eb0dd41f | 1176 | |
1177 | /* XXX should be pre-session */ | |
1178 | ssh_init_forwarding(); | |
1179 | ||
bcdb96c2 | 1180 | if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN)) |
1181 | id = ssh_session2_open(); | |
eb0dd41f | 1182 | |
1183 | /* If requested, let ssh continue in the background. */ | |
1184 | if (fork_after_authentication_flag) | |
1185 | if (daemon(1, 1) < 0) | |
1186 | fatal("daemon() failed: %.200s", strerror(errno)); | |
1187 | ||
4bf9c10e | 1188 | return client_loop(tty_flag, tty_flag ? |
1189 | options.escape_char : SSH_ESCAPECHAR_NONE, id); | |
8efc0c15 | 1190 | } |
fa08c86b | 1191 | |
396c147e | 1192 | static void |
fee56204 | 1193 | load_public_identity_files(void) |
1194 | { | |
1195 | char *filename; | |
2e23cde0 | 1196 | int i = 0; |
0659cace | 1197 | Key *public; |
383546c4 | 1198 | #ifdef SMARTCARD |
0659cace | 1199 | Key **keys; |
1200 | ||
9ff6f66f | 1201 | if (options.smartcard_device != NULL && |
0659cace | 1202 | options.num_identity_files < SSH_MAX_IDENTITY_FILES && |
1203 | (keys = sc_get_keys(options.smartcard_device, NULL)) != NULL ) { | |
1204 | int count = 0; | |
1205 | for (i = 0; keys[i] != NULL; i++) { | |
1206 | count++; | |
0659cace | 1207 | memmove(&options.identity_files[1], &options.identity_files[0], |
1208 | sizeof(char *) * (SSH_MAX_IDENTITY_FILES - 1)); | |
1209 | memmove(&options.identity_keys[1], &options.identity_keys[0], | |
1210 | sizeof(Key *) * (SSH_MAX_IDENTITY_FILES - 1)); | |
1211 | options.num_identity_files++; | |
1212 | options.identity_keys[0] = keys[i]; | |
244e796f | 1213 | options.identity_files[0] = sc_get_key_label(keys[i]); |
0659cace | 1214 | } |
1c2deed1 | 1215 | if (options.num_identity_files > SSH_MAX_IDENTITY_FILES) |
1216 | options.num_identity_files = SSH_MAX_IDENTITY_FILES; | |
0659cace | 1217 | i = count; |
1218 | xfree(keys); | |
383546c4 | 1219 | } |
3e984472 | 1220 | #endif /* SMARTCARD */ |
2e23cde0 | 1221 | for (; i < options.num_identity_files; i++) { |
1222 | filename = tilde_expand_filename(options.identity_files[i], | |
1223 | original_real_uid); | |
1224 | public = key_load_public(filename, NULL); | |
1225 | debug("identity file %s type %d", filename, | |
1226 | public ? public->type : -1); | |
1227 | xfree(options.identity_files[i]); | |
1228 | options.identity_files[i] = filename; | |
1229 | options.identity_keys[i] = public; | |
1230 | } | |
fee56204 | 1231 | } |