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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" | |
03c82656 | 43 | RCSID("$OpenBSD: ssh.c,v 1.195 2003/07/02 20:37:48 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 | |
48e671d5 | 82 | /* Flag indicating whether IPv4 or IPv6. This can be set on the command line. |
83 | Default value is AF_UNSPEC means both IPv4 and IPv6. */ | |
84 | int IPv4or6 = AF_UNSPEC; | |
85 | ||
5260325f | 86 | /* Flag indicating whether debug mode is on. This can be set on the command line. */ |
8efc0c15 | 87 | int debug_flag = 0; |
88 | ||
a8be9f80 | 89 | /* Flag indicating whether a tty should be allocated */ |
8efc0c15 | 90 | int tty_flag = 0; |
8abcdba4 | 91 | int no_tty_flag = 0; |
92 | int force_tty_flag = 0; | |
8efc0c15 | 93 | |
8ce64345 | 94 | /* don't exec a shell */ |
95 | int no_shell_flag = 0; | |
8ce64345 | 96 | |
aa3378df | 97 | /* |
98 | * Flag indicating that nothing should be read from stdin. This can be set | |
99 | * on the command line. | |
100 | */ | |
8efc0c15 | 101 | int stdin_null_flag = 0; |
102 | ||
aa3378df | 103 | /* |
104 | * Flag indicating that ssh should fork after authentication. This is useful | |
c242fc96 | 105 | * so that the passphrase can be entered manually, and then ssh goes to the |
aa3378df | 106 | * background. |
107 | */ | |
8efc0c15 | 108 | int fork_after_authentication_flag = 0; |
109 | ||
aa3378df | 110 | /* |
111 | * General data structure for command line options and options configurable | |
112 | * in configuration files. See readconf.h. | |
113 | */ | |
8efc0c15 | 114 | Options options; |
115 | ||
e591b98a | 116 | /* optional user configfile */ |
117 | char *config = NULL; | |
118 | ||
aa3378df | 119 | /* |
120 | * Name of the host we are connecting to. This is the name given on the | |
121 | * command line, or the HostName specified for the user-supplied name in a | |
122 | * configuration file. | |
123 | */ | |
8efc0c15 | 124 | char *host; |
125 | ||
126 | /* socket address the host resolves to */ | |
48e671d5 | 127 | struct sockaddr_storage hostaddr; |
8efc0c15 | 128 | |
8002af61 | 129 | /* Private host keys. */ |
39c00dc2 | 130 | Sensitive sensitive_data; |
8efc0c15 | 131 | |
132 | /* Original real UID. */ | |
133 | uid_t original_real_uid; | |
3fb156df | 134 | uid_t original_effective_uid; |
8efc0c15 | 135 | |
8ce64345 | 136 | /* command to be executed */ |
137 | Buffer command; | |
138 | ||
ae810de7 | 139 | /* Should we execute a command or invoke a subsystem? */ |
140 | int subsystem_flag = 0; | |
141 | ||
e0ae8728 | 142 | /* # of replies received for global requests */ |
143 | static int client_global_request_id = 0; | |
144 | ||
6939bbd4 | 145 | /* pid of proxycommand child process */ |
146 | pid_t proxy_command_pid = 0; | |
147 | ||
8efc0c15 | 148 | /* Prints a help message to the user. This function never returns. */ |
149 | ||
396c147e | 150 | static void |
5ca51e19 | 151 | usage(void) |
8efc0c15 | 152 | { |
1fe6a48f | 153 | fprintf(stderr, "Usage: %s [options] host [command]\n", __progname); |
5260325f | 154 | fprintf(stderr, "Options:\n"); |
155 | fprintf(stderr, " -l user Log in using this user name.\n"); | |
5ca51e19 | 156 | fprintf(stderr, " -n Redirect input from " _PATH_DEVNULL ".\n"); |
e591b98a | 157 | fprintf(stderr, " -F config Config file (default: ~/%s).\n", |
158 | _PATH_SSH_USER_CONFFILE); | |
71276795 | 159 | fprintf(stderr, " -A Enable authentication agent forwarding.\n"); |
63cd7dd0 | 160 | fprintf(stderr, " -a Disable authentication agent forwarding (default).\n"); |
8efc0c15 | 161 | #ifdef AFS |
5260325f | 162 | fprintf(stderr, " -k Disable Kerberos ticket and AFS token forwarding.\n"); |
163 | #endif /* AFS */ | |
2b87da3b | 164 | fprintf(stderr, " -X Enable X11 connection forwarding.\n"); |
63cd7dd0 | 165 | fprintf(stderr, " -x Disable X11 connection forwarding (default).\n"); |
a01a5f30 | 166 | fprintf(stderr, " -i file Identity for public key authentication " |
167 | "(default: ~/.ssh/identity)\n"); | |
315dfb04 | 168 | #ifdef SMARTCARD |
169 | fprintf(stderr, " -I reader Set smartcard reader.\n"); | |
dd2495cb | 170 | #endif |
5260325f | 171 | fprintf(stderr, " -t Tty; allocate a tty even if command is given.\n"); |
8ce64345 | 172 | fprintf(stderr, " -T Do not allocate a tty.\n"); |
5260325f | 173 | fprintf(stderr, " -v Verbose; display verbose debugging messages.\n"); |
bcbf86ec | 174 | fprintf(stderr, " Multiple -v increases verbosity.\n"); |
5260325f | 175 | fprintf(stderr, " -V Display version number only.\n"); |
5260325f | 176 | fprintf(stderr, " -q Quiet; don't display any warning messages.\n"); |
177 | fprintf(stderr, " -f Fork into background after authentication.\n"); | |
178 | fprintf(stderr, " -e char Set escape character; ``none'' = disable (default: ~).\n"); | |
179 | ||
63cd7dd0 | 180 | fprintf(stderr, " -c cipher Select encryption algorithm\n"); |
38967add | 181 | fprintf(stderr, " -m macs Specify MAC algorithms for protocol version 2.\n"); |
5260325f | 182 | fprintf(stderr, " -p port Connect to this port. Server must be on the same port.\n"); |
183 | fprintf(stderr, " -L listen-port:host:port Forward local port to remote address\n"); | |
184 | fprintf(stderr, " -R listen-port:host:port Forward remote port to local address\n"); | |
1fe6a48f | 185 | fprintf(stderr, " These cause %s to listen for connections on a port, and\n", __progname); |
5260325f | 186 | fprintf(stderr, " forward them to the other side by connecting to host:port.\n"); |
4c780c2a | 187 | fprintf(stderr, " -D port Enable dynamic application-level port forwarding.\n"); |
5260325f | 188 | fprintf(stderr, " -C Enable compression.\n"); |
8ce64345 | 189 | fprintf(stderr, " -N Do not execute a shell or command.\n"); |
5260325f | 190 | fprintf(stderr, " -g Allow remote hosts to connect to forwarded ports.\n"); |
1f3bf5aa | 191 | fprintf(stderr, " -1 Force protocol version 1.\n"); |
192 | fprintf(stderr, " -2 Force protocol version 2.\n"); | |
48e671d5 | 193 | fprintf(stderr, " -4 Use IPv4 only.\n"); |
194 | fprintf(stderr, " -6 Use IPv6 only.\n"); | |
5260325f | 195 | fprintf(stderr, " -o 'option' Process the option as if it was read from a configuration file.\n"); |
ae810de7 | 196 | fprintf(stderr, " -s Invoke command (mandatory) as SSH2 subsystem.\n"); |
63cd7dd0 | 197 | fprintf(stderr, " -b addr Local IP address.\n"); |
5260325f | 198 | exit(1); |
8efc0c15 | 199 | } |
200 | ||
396c147e | 201 | static int ssh_session(void); |
202 | static int ssh_session2(void); | |
203 | static void load_public_identity_files(void); | |
8ce64345 | 204 | |
5260325f | 205 | /* |
206 | * Main program for the ssh client. | |
207 | */ | |
8efc0c15 | 208 | int |
209 | main(int ac, char **av) | |
210 | { | |
b34bec32 | 211 | int i, opt, exit_status; |
57112b5a | 212 | u_short fwd_port, fwd_host_port; |
d2e3df16 | 213 | char sfwd_port[6], sfwd_host_port[6]; |
f5a1a01a | 214 | char *p, *cp, buf[256]; |
5260325f | 215 | struct stat st; |
3b1a83df | 216 | struct passwd *pw; |
8ce64345 | 217 | int dummy; |
57dade33 | 218 | extern int optind, optreset; |
1812a662 | 219 | extern char *optarg; |
5260325f | 220 | |
260d427b | 221 | __progname = get_progname(av[0]); |
264dce47 | 222 | init_rng(); |
223 | ||
aa3378df | 224 | /* |
225 | * Save the original real uid. It will be needed later (uid-swapping | |
226 | * may clobber the real uid). | |
227 | */ | |
5260325f | 228 | original_real_uid = getuid(); |
229 | original_effective_uid = geteuid(); | |
9f324470 | 230 | |
231 | /* | |
232 | * Use uid-swapping to give up root privileges for the duration of | |
233 | * option processing. We will re-instantiate the rights when we are | |
234 | * ready to create the privileged port, and will permanently drop | |
235 | * them when the port has been created (actually, when the connection | |
236 | * has been made, as we may need to create the port several times). | |
237 | */ | |
238 | PRIV_END; | |
5260325f | 239 | |
7322ef0e | 240 | #ifdef HAVE_SETRLIMIT |
5260325f | 241 | /* If we are installed setuid root be careful to not drop core. */ |
242 | if (original_real_uid != original_effective_uid) { | |
243 | struct rlimit rlim; | |
244 | rlim.rlim_cur = rlim.rlim_max = 0; | |
245 | if (setrlimit(RLIMIT_CORE, &rlim) < 0) | |
246 | fatal("setrlimit failed: %.100s", strerror(errno)); | |
8efc0c15 | 247 | } |
3c62e7eb | 248 | #endif |
63bd8c36 | 249 | /* Get user data. */ |
250 | pw = getpwuid(original_real_uid); | |
251 | if (!pw) { | |
bbe88b6d | 252 | logit("You don't exist, go away!"); |
63bd8c36 | 253 | exit(1); |
254 | } | |
255 | /* Take a copy of the returned structure. */ | |
256 | pw = pwcopy(pw); | |
257 | ||
aa3378df | 258 | /* |
259 | * Set our umask to something reasonable, as some files are created | |
260 | * with the default umask. This will make them world-readable but | |
261 | * writable only by the owner, which is ok for all files for which we | |
262 | * don't set the modes explicitly. | |
263 | */ | |
5260325f | 264 | umask(022); |
265 | ||
5260325f | 266 | /* Initialize option structure to indicate that no values have been set. */ |
267 | initialize_options(&options); | |
268 | ||
269 | /* Parse command-line arguments. */ | |
270 | host = NULL; | |
271 | ||
f5a1a01a | 272 | again: |
273 | while ((opt = getopt(ac, av, | |
e591b98a | 274 | "1246ab:c:e:fgi:kl:m:no:p:qstvxACD:F:I:L:NPR:TVX")) != -1) { |
5260325f | 275 | switch (opt) { |
1f3bf5aa | 276 | case '1': |
277 | options.protocol = SSH_PROTO_1; | |
278 | break; | |
6ae2364d | 279 | case '2': |
280 | options.protocol = SSH_PROTO_2; | |
281 | break; | |
48e671d5 | 282 | case '4': |
283 | IPv4or6 = AF_INET; | |
284 | break; | |
48e671d5 | 285 | case '6': |
286 | IPv4or6 = AF_INET6; | |
287 | break; | |
5260325f | 288 | case 'n': |
289 | stdin_null_flag = 1; | |
290 | break; | |
5260325f | 291 | case 'f': |
292 | fork_after_authentication_flag = 1; | |
293 | stdin_null_flag = 1; | |
294 | break; | |
5260325f | 295 | case 'x': |
296 | options.forward_x11 = 0; | |
297 | break; | |
5260325f | 298 | case 'X': |
299 | options.forward_x11 = 1; | |
300 | break; | |
5260325f | 301 | case 'g': |
302 | options.gateway_ports = 1; | |
303 | break; | |
e59404d1 | 304 | case 'P': /* deprecated */ |
5260325f | 305 | options.use_privileged_port = 0; |
306 | break; | |
5260325f | 307 | case 'a': |
308 | options.forward_agent = 0; | |
309 | break; | |
71276795 | 310 | case 'A': |
311 | options.forward_agent = 1; | |
312 | break; | |
5260325f | 313 | #ifdef AFS |
314 | case 'k': | |
315 | options.kerberos_tgt_passing = 0; | |
316 | options.afs_token_passing = 0; | |
317 | break; | |
318 | #endif | |
319 | case 'i': | |
320 | if (stat(optarg, &st) < 0) { | |
f5a1a01a | 321 | fprintf(stderr, "Warning: Identity file %s " |
322 | "does not exist.\n", optarg); | |
5260325f | 323 | break; |
324 | } | |
f5a1a01a | 325 | if (options.num_identity_files >= |
326 | SSH_MAX_IDENTITY_FILES) | |
327 | fatal("Too many identity files specified " | |
328 | "(max %d)", SSH_MAX_IDENTITY_FILES); | |
329 | options.identity_files[options.num_identity_files++] = | |
330 | xstrdup(optarg); | |
5260325f | 331 | break; |
383546c4 | 332 | case 'I': |
333 | #ifdef SMARTCARD | |
9ff6f66f | 334 | options.smartcard_device = xstrdup(optarg); |
dd2495cb | 335 | #else |
383546c4 | 336 | fprintf(stderr, "no support for smartcards.\n"); |
dd2495cb | 337 | #endif |
383546c4 | 338 | break; |
5260325f | 339 | case 't': |
8abcdba4 | 340 | if (tty_flag) |
341 | force_tty_flag = 1; | |
5260325f | 342 | tty_flag = 1; |
343 | break; | |
5260325f | 344 | case 'v': |
bcbf86ec | 345 | if (0 == debug_flag) { |
346 | debug_flag = 1; | |
347 | options.log_level = SYSLOG_LEVEL_DEBUG1; | |
348 | } else if (options.log_level < SYSLOG_LEVEL_DEBUG3) { | |
349 | options.log_level++; | |
350 | break; | |
f5a1a01a | 351 | } else |
54b974dc | 352 | fatal("Too high debugging level."); |
bcbf86ec | 353 | /* fallthrough */ |
5260325f | 354 | case 'V': |
e68225b2 | 355 | fprintf(stderr, |
c936c243 | 356 | "%s, SSH protocols %d.%d/%d.%d, %s\n", |
a8be9f80 | 357 | SSH_VERSION, |
358 | PROTOCOL_MAJOR_1, PROTOCOL_MINOR_1, | |
e68225b2 | 359 | PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2, |
c936c243 | 360 | SSLeay_version(SSLEAY_VERSION)); |
5260325f | 361 | if (opt == 'V') |
362 | exit(0); | |
5260325f | 363 | break; |
5260325f | 364 | case 'q': |
365 | options.log_level = SYSLOG_LEVEL_QUIET; | |
366 | break; | |
5260325f | 367 | case 'e': |
368 | if (optarg[0] == '^' && optarg[2] == 0 && | |
f5a1a01a | 369 | (u_char) optarg[1] >= 64 && |
370 | (u_char) optarg[1] < 128) | |
1e3b8b07 | 371 | options.escape_char = (u_char) optarg[1] & 31; |
5260325f | 372 | else if (strlen(optarg) == 1) |
1e3b8b07 | 373 | options.escape_char = (u_char) optarg[0]; |
5260325f | 374 | else if (strcmp(optarg, "none") == 0) |
4bf9c10e | 375 | options.escape_char = SSH_ESCAPECHAR_NONE; |
5260325f | 376 | else { |
f5a1a01a | 377 | fprintf(stderr, "Bad escape character '%s'.\n", |
378 | optarg); | |
5260325f | 379 | exit(1); |
380 | } | |
381 | break; | |
5260325f | 382 | case 'c': |
a306f2dd | 383 | if (ciphers_valid(optarg)) { |
384 | /* SSH2 only */ | |
385 | options.ciphers = xstrdup(optarg); | |
d0c832f3 | 386 | options.cipher = SSH_CIPHER_ILLEGAL; |
a306f2dd | 387 | } else { |
388 | /* SSH1 only */ | |
c523303b | 389 | options.cipher = cipher_number(optarg); |
390 | if (options.cipher == -1) { | |
f5a1a01a | 391 | fprintf(stderr, |
392 | "Unknown cipher type '%s'\n", | |
393 | optarg); | |
a306f2dd | 394 | exit(1); |
395 | } | |
f5a1a01a | 396 | if (options.cipher == SSH_CIPHER_3DES) |
c523303b | 397 | options.ciphers = "3des-cbc"; |
f5a1a01a | 398 | else if (options.cipher == SSH_CIPHER_BLOWFISH) |
c523303b | 399 | options.ciphers = "blowfish-cbc"; |
f5a1a01a | 400 | else |
c523303b | 401 | options.ciphers = (char *)-1; |
5260325f | 402 | } |
403 | break; | |
b2552997 | 404 | case 'm': |
405 | if (mac_valid(optarg)) | |
406 | options.macs = xstrdup(optarg); | |
407 | else { | |
f5a1a01a | 408 | fprintf(stderr, "Unknown mac type '%s'\n", |
409 | optarg); | |
b2552997 | 410 | exit(1); |
411 | } | |
412 | break; | |
5260325f | 413 | case 'p': |
2d2a2c65 | 414 | options.port = a2port(optarg); |
415 | if (options.port == 0) { | |
6031af8d | 416 | fprintf(stderr, "Bad port '%s'\n", optarg); |
417 | exit(1); | |
418 | } | |
5260325f | 419 | break; |
5260325f | 420 | case 'l': |
421 | options.user = optarg; | |
422 | break; | |
d2e3df16 | 423 | |
424 | case 'L': | |
5260325f | 425 | case 'R': |
fa065de2 | 426 | if (sscanf(optarg, "%5[0123456789]:%255[^:]:%5[0123456789]", |
d2e3df16 | 427 | sfwd_port, buf, sfwd_host_port) != 3 && |
fa065de2 | 428 | sscanf(optarg, "%5[0123456789]/%255[^/]/%5[0123456789]", |
d2e3df16 | 429 | sfwd_port, buf, sfwd_host_port) != 3) { |
f5a1a01a | 430 | fprintf(stderr, |
d2e3df16 | 431 | "Bad forwarding specification '%s'\n", |
f5a1a01a | 432 | optarg); |
5260325f | 433 | usage(); |
434 | /* NOTREACHED */ | |
435 | } | |
d2e3df16 | 436 | if ((fwd_port = a2port(sfwd_port)) == 0 || |
762715ce | 437 | (fwd_host_port = a2port(sfwd_host_port)) == 0) { |
f5a1a01a | 438 | fprintf(stderr, |
d2e3df16 | 439 | "Bad forwarding port(s) '%s'\n", optarg); |
440 | exit(1); | |
5260325f | 441 | } |
d2e3df16 | 442 | if (opt == 'L') |
443 | add_local_forward(&options, fwd_port, buf, | |
444 | fwd_host_port); | |
445 | else if (opt == 'R') | |
446 | add_remote_forward(&options, fwd_port, buf, | |
184eed6a | 447 | fwd_host_port); |
5260325f | 448 | break; |
0490e609 | 449 | |
450 | case 'D': | |
2d2a2c65 | 451 | fwd_port = a2port(optarg); |
452 | if (fwd_port == 0) { | |
f5a1a01a | 453 | fprintf(stderr, "Bad dynamic port '%s'\n", |
454 | optarg); | |
6031af8d | 455 | exit(1); |
456 | } | |
0490e609 | 457 | add_local_forward(&options, fwd_port, "socks4", 0); |
458 | break; | |
459 | ||
5260325f | 460 | case 'C': |
461 | options.compression = 1; | |
462 | break; | |
8ce64345 | 463 | case 'N': |
464 | no_shell_flag = 1; | |
465 | no_tty_flag = 1; | |
466 | break; | |
8ce64345 | 467 | case 'T': |
468 | no_tty_flag = 1; | |
469 | break; | |
5260325f | 470 | case 'o': |
471 | dummy = 1; | |
f5a1a01a | 472 | if (process_config_line(&options, host ? host : "", |
473 | optarg, "command-line", 0, &dummy) != 0) | |
5260325f | 474 | exit(1); |
475 | break; | |
ae810de7 | 476 | case 's': |
477 | subsystem_flag = 1; | |
478 | break; | |
3435f5a6 | 479 | case 'b': |
480 | options.bind_address = optarg; | |
481 | break; | |
e591b98a | 482 | case 'F': |
483 | config = optarg; | |
484 | break; | |
5260325f | 485 | default: |
486 | usage(); | |
487 | } | |
488 | } | |
489 | ||
f5a1a01a | 490 | ac -= optind; |
491 | av += optind; | |
492 | ||
493 | if (ac > 0 && !host && **av != '-') { | |
15748b4d | 494 | if (strrchr(*av, '@')) { |
f5a1a01a | 495 | p = xstrdup(*av); |
15748b4d | 496 | cp = strrchr(p, '@'); |
f5a1a01a | 497 | if (cp == NULL || cp == p) |
498 | usage(); | |
499 | options.user = p; | |
500 | *cp = '\0'; | |
501 | host = ++cp; | |
502 | } else | |
503 | host = *av; | |
978ebf99 | 504 | if (ac > 1) { |
505 | optind = optreset = 1; | |
f5a1a01a | 506 | goto again; |
507 | } | |
978ebf99 | 508 | ac--, av++; |
f5a1a01a | 509 | } |
510 | ||
5260325f | 511 | /* Check that we got a host name. */ |
512 | if (!host) | |
8efc0c15 | 513 | usage(); |
5260325f | 514 | |
22d89d24 | 515 | SSLeay_add_all_algorithms(); |
fa08c86b | 516 | ERR_load_crypto_strings(); |
5e4a7219 | 517 | channel_set_af(IPv4or6); |
22d89d24 | 518 | |
5260325f | 519 | /* Initialize the command to execute on remote host. */ |
520 | buffer_init(&command); | |
521 | ||
aa3378df | 522 | /* |
523 | * Save the command to execute on the remote host in a buffer. There | |
524 | * is no limit on the length of the command, except by the maximum | |
525 | * packet size. Also sets the tty flag if there is no command. | |
526 | */ | |
f5a1a01a | 527 | if (!ac) { |
5260325f | 528 | /* No command specified - execute shell on a tty. */ |
529 | tty_flag = 1; | |
ae810de7 | 530 | if (subsystem_flag) { |
f5a1a01a | 531 | fprintf(stderr, |
532 | "You must specify a subsystem to invoke.\n"); | |
ae810de7 | 533 | usage(); |
534 | } | |
5260325f | 535 | } else { |
f5a1a01a | 536 | /* A command has been specified. Store it into the buffer. */ |
537 | for (i = 0; i < ac; i++) { | |
538 | if (i) | |
5260325f | 539 | buffer_append(&command, " ", 1); |
540 | buffer_append(&command, av[i], strlen(av[i])); | |
541 | } | |
8efc0c15 | 542 | } |
5260325f | 543 | |
544 | /* Cannot fork to background if no command. */ | |
14a9a859 | 545 | if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag) |
5260325f | 546 | fatal("Cannot fork into background without a command to execute."); |
547 | ||
548 | /* Allocate a tty by default if no command specified. */ | |
549 | if (buffer_len(&command) == 0) | |
550 | tty_flag = 1; | |
551 | ||
343288b8 | 552 | /* Force no tty */ |
0b6fbf03 | 553 | if (no_tty_flag) |
554 | tty_flag = 0; | |
5260325f | 555 | /* Do not allocate a tty if stdin is not a tty. */ |
8abcdba4 | 556 | if (!isatty(fileno(stdin)) && !force_tty_flag) { |
5260325f | 557 | if (tty_flag) |
bbe88b6d | 558 | logit("Pseudo-terminal will not be allocated because stdin is not a terminal."); |
5260325f | 559 | tty_flag = 0; |
560 | } | |
8ce64345 | 561 | |
20244695 | 562 | /* |
563 | * Initialize "log" output. Since we are the client all output | |
564 | * actually goes to stderr. | |
565 | */ | |
cc44f691 | 566 | log_init(av[0], options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level, |
567 | SYSLOG_FACILITY_USER, 1); | |
5260325f | 568 | |
e591b98a | 569 | /* |
570 | * Read per-user configuration file. Ignore the system wide config | |
571 | * file if the user specifies a config file on the command line. | |
572 | */ | |
573 | if (config != NULL) { | |
93111dfa | 574 | if (!read_config_file(config, host, &options)) |
575 | fatal("Can't open user config file %.100s: " | |
576 | "%.100s", config, strerror(errno)); | |
e591b98a | 577 | } else { |
578 | snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, | |
579 | _PATH_SSH_USER_CONFFILE); | |
f67792f2 | 580 | (void)read_config_file(buf, host, &options); |
e591b98a | 581 | |
f67792f2 | 582 | /* Read systemwide configuration file after use config. */ |
93111dfa | 583 | (void)read_config_file(_PATH_HOST_CONFIG_FILE, host, &options); |
e591b98a | 584 | } |
5260325f | 585 | |
586 | /* Fill configuration defaults. */ | |
587 | fill_default_options(&options); | |
588 | ||
589 | /* reinit */ | |
20244695 | 590 | log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 1); |
5260325f | 591 | |
e339aa53 | 592 | seed_rng(); |
593 | ||
5260325f | 594 | if (options.user == NULL) |
595 | options.user = xstrdup(pw->pw_name); | |
596 | ||
597 | if (options.hostname != NULL) | |
598 | host = options.hostname; | |
599 | ||
03c82656 | 600 | /* force lowercase for hostkey matching */ |
601 | if (options.host_key_alias != NULL) { | |
602 | for (p = options.host_key_alias; *p; p++) | |
603 | if (isupper(*p)) | |
604 | *p = tolower(*p); | |
605 | } | |
606 | ||
f78bde70 | 607 | if (options.proxy_command != NULL && |
608 | strcmp(options.proxy_command, "none") == 0) | |
609 | options.proxy_command = NULL; | |
610 | ||
5260325f | 611 | /* Disable rhosts authentication if not running as root. */ |
3c62e7eb | 612 | #ifdef HAVE_CYGWIN |
613 | /* Ignore uid if running under Windows */ | |
614 | if (!options.use_privileged_port) { | |
615 | #else | |
5260325f | 616 | if (original_effective_uid != 0 || !options.use_privileged_port) { |
3c62e7eb | 617 | #endif |
6ffc9c88 | 618 | debug("Rhosts Authentication disabled, " |
619 | "originating port will not be trusted."); | |
5260325f | 620 | options.rhosts_authentication = 0; |
5260325f | 621 | } |
6ffc9c88 | 622 | /* Open a connection to the remote host. */ |
5260325f | 623 | |
b34bec32 | 624 | if (ssh_connect(host, &hostaddr, options.port, IPv4or6, |
6ffc9c88 | 625 | options.connection_attempts, |
d514c907 | 626 | #ifdef HAVE_CYGWIN |
627 | options.use_privileged_port, | |
628 | #else | |
3fb156df | 629 | original_effective_uid == 0 && options.use_privileged_port, |
d514c907 | 630 | #endif |
de60473e | 631 | options.proxy_command) != 0) |
b34bec32 | 632 | exit(1); |
5260325f | 633 | |
aa3378df | 634 | /* |
635 | * If we successfully made the connection, load the host private key | |
636 | * in case we will need it later for combined rsa-rhosts | |
637 | * authentication. This must be done before releasing extra | |
638 | * privileges, because the file is only readable by root. | |
78660ed4 | 639 | * If we cannot access the private keys, load the public keys |
640 | * instead and try to execute the ssh-keysign helper instead. | |
aa3378df | 641 | */ |
8002af61 | 642 | sensitive_data.nkeys = 0; |
643 | sensitive_data.keys = NULL; | |
39c00dc2 | 644 | sensitive_data.external_keysign = 0; |
b34bec32 | 645 | if (options.rhosts_rsa_authentication || |
646 | options.hostbased_authentication) { | |
8002af61 | 647 | sensitive_data.nkeys = 3; |
343288b8 | 648 | sensitive_data.keys = xmalloc(sensitive_data.nkeys * |
649 | sizeof(Key)); | |
3fb156df | 650 | |
651 | PRIV_START; | |
8002af61 | 652 | sensitive_data.keys[0] = key_load_private_type(KEY_RSA1, |
aeaa3d9e | 653 | _PATH_HOST_KEY_FILE, "", NULL); |
8002af61 | 654 | sensitive_data.keys[1] = key_load_private_type(KEY_DSA, |
655 | _PATH_HOST_DSA_KEY_FILE, "", NULL); | |
656 | sensitive_data.keys[2] = key_load_private_type(KEY_RSA, | |
657 | _PATH_HOST_RSA_KEY_FILE, "", NULL); | |
3fb156df | 658 | PRIV_END; |
39c00dc2 | 659 | |
60cd0a97 | 660 | if (options.hostbased_authentication == 1 && |
661 | sensitive_data.keys[0] == NULL && | |
39c00dc2 | 662 | sensitive_data.keys[1] == NULL && |
663 | sensitive_data.keys[2] == NULL) { | |
664 | sensitive_data.keys[1] = key_load_public( | |
665 | _PATH_HOST_DSA_KEY_FILE, NULL); | |
666 | sensitive_data.keys[2] = key_load_public( | |
667 | _PATH_HOST_RSA_KEY_FILE, NULL); | |
668 | sensitive_data.external_keysign = 1; | |
669 | } | |
5260325f | 670 | } |
aa3378df | 671 | /* |
672 | * Get rid of any extra privileges that we may have. We will no | |
673 | * longer need them. Also, extra privileges could make it very hard | |
674 | * to read identity files and other non-world-readable files from the | |
675 | * user's home directory if it happens to be on a NFS volume where | |
676 | * root is mapped to nobody. | |
677 | */ | |
3fb156df | 678 | seteuid(original_real_uid); |
679 | setuid(original_real_uid); | |
5260325f | 680 | |
aa3378df | 681 | /* |
682 | * Now that we are back to our own permissions, create ~/.ssh | |
683 | * directory if it doesn\'t already exist. | |
684 | */ | |
c3abff07 | 685 | snprintf(buf, sizeof buf, "%.100s%s%.100s", pw->pw_dir, strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR); |
5260325f | 686 | if (stat(buf, &st) < 0) |
704b1659 | 687 | if (mkdir(buf, 0700) < 0) |
5260325f | 688 | error("Could not create directory '%.200s'.", buf); |
689 | ||
fee56204 | 690 | /* load options.identity_files */ |
691 | load_public_identity_files(); | |
692 | ||
693 | /* Expand ~ in known host file names. */ | |
694 | /* XXX mem-leaks: */ | |
fa08c86b | 695 | options.system_hostfile = |
696 | tilde_expand_filename(options.system_hostfile, original_real_uid); | |
697 | options.user_hostfile = | |
698 | tilde_expand_filename(options.user_hostfile, original_real_uid); | |
699 | options.system_hostfile2 = | |
700 | tilde_expand_filename(options.system_hostfile2, original_real_uid); | |
701 | options.user_hostfile2 = | |
702 | tilde_expand_filename(options.user_hostfile2, original_real_uid); | |
5260325f | 703 | |
67b75437 | 704 | signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */ |
705 | ||
5260325f | 706 | /* Log into the remote system. This never returns if the login fails. */ |
39c00dc2 | 707 | ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr, pw); |
8002af61 | 708 | |
709 | /* We no longer need the private host keys. Clear them now. */ | |
710 | if (sensitive_data.nkeys != 0) { | |
711 | for (i = 0; i < sensitive_data.nkeys; i++) { | |
712 | if (sensitive_data.keys[i] != NULL) { | |
713 | /* Destroys contents safely */ | |
714 | debug3("clear hostkey %d", i); | |
715 | key_free(sensitive_data.keys[i]); | |
716 | sensitive_data.keys[i] = NULL; | |
717 | } | |
718 | } | |
719 | xfree(sensitive_data.keys); | |
720 | } | |
05b7537a | 721 | for (i = 0; i < options.num_identity_files; i++) { |
722 | if (options.identity_files[i]) { | |
723 | xfree(options.identity_files[i]); | |
724 | options.identity_files[i] = NULL; | |
725 | } | |
726 | if (options.identity_keys[i]) { | |
727 | key_free(options.identity_keys[i]); | |
728 | options.identity_keys[i] = NULL; | |
729 | } | |
730 | } | |
5260325f | 731 | |
8ce64345 | 732 | exit_status = compat20 ? ssh_session2() : ssh_session(); |
733 | packet_close(); | |
6939bbd4 | 734 | |
735 | /* | |
736 | * Send SIGHUP to proxy command if used. We don't wait() in | |
737 | * case it hangs and instead rely on init to reap the child | |
738 | */ | |
739 | if (proxy_command_pid > 1) | |
740 | kill(proxy_command_pid, SIGHUP); | |
741 | ||
8ce64345 | 742 | return exit_status; |
743 | } | |
744 | ||
396c147e | 745 | static void |
b48eeb07 | 746 | x11_get_proto(char **_proto, char **_data) |
0b242b12 | 747 | { |
748 | char line[512]; | |
b48eeb07 | 749 | static char proto[512], data[512]; |
0b242b12 | 750 | FILE *f; |
751 | int got_data = 0, i; | |
75a624f0 | 752 | char *display; |
5d185586 | 753 | struct stat st; |
0b242b12 | 754 | |
b48eeb07 | 755 | *_proto = proto; |
756 | *_data = data; | |
757 | proto[0] = data[0] = '\0'; | |
5d185586 | 758 | if (!options.xauth_location || |
759 | (stat(options.xauth_location, &st) == -1)) { | |
760 | debug("No xauth program."); | |
761 | } else { | |
762 | if ((display = getenv("DISPLAY")) == NULL) { | |
763 | debug("x11_get_proto: DISPLAY not set"); | |
764 | return; | |
765 | } | |
fa649821 | 766 | /* Try to get Xauthority information for the display. */ |
75a624f0 | 767 | if (strncmp(display, "localhost:", 10) == 0) |
768 | /* | |
769 | * Handle FamilyLocal case where $DISPLAY does | |
770 | * not match an authorization entry. For this we | |
771 | * just try "xauth list unix:displaynum.screennum". | |
772 | * XXX: "localhost" match to determine FamilyLocal | |
773 | * is not perfect. | |
774 | */ | |
375e20e7 | 775 | snprintf(line, sizeof line, "%s list unix:%s 2>" |
75a624f0 | 776 | _PATH_DEVNULL, options.xauth_location, display+10); |
777 | else | |
375e20e7 | 778 | snprintf(line, sizeof line, "%s list %.200s 2>" |
75a624f0 | 779 | _PATH_DEVNULL, options.xauth_location, display); |
5d185586 | 780 | debug2("x11_get_proto: %s", line); |
fa649821 | 781 | f = popen(line, "r"); |
782 | if (f && fgets(line, sizeof(line), f) && | |
b48eeb07 | 783 | sscanf(line, "%*s %511s %511s", proto, data) == 2) |
fa649821 | 784 | got_data = 1; |
785 | if (f) | |
786 | pclose(f); | |
787 | } | |
0b242b12 | 788 | /* |
789 | * If we didn't get authentication data, just make up some | |
790 | * data. The forwarding code will check the validity of the | |
791 | * response anyway, and substitute this data. The X11 | |
792 | * server, however, will ignore this fake data and use | |
793 | * whatever authentication mechanisms it was using otherwise | |
794 | * for the local connection. | |
795 | */ | |
796 | if (!got_data) { | |
797 | u_int32_t rand = 0; | |
798 | ||
bbe88b6d | 799 | logit("Warning: No xauth data; using fake authentication data for X11 forwarding."); |
b48eeb07 | 800 | strlcpy(proto, "MIT-MAGIC-COOKIE-1", sizeof proto); |
0b242b12 | 801 | for (i = 0; i < 16; i++) { |
802 | if (i % 4 == 0) | |
803 | rand = arc4random(); | |
b48eeb07 | 804 | snprintf(data + 2 * i, sizeof data - 2 * i, "%02x", rand & 0xff); |
0b242b12 | 805 | rand >>= 8; |
806 | } | |
807 | } | |
808 | } | |
809 | ||
396c147e | 810 | static void |
fa08c86b | 811 | ssh_init_forwarding(void) |
812 | { | |
02a024dd | 813 | int success = 0; |
fa08c86b | 814 | int i; |
02a024dd | 815 | |
fa08c86b | 816 | /* Initiate local TCP/IP port forwardings. */ |
817 | for (i = 0; i < options.num_local_forwards; i++) { | |
818 | debug("Connections to local port %d forwarded to remote address %.200s:%d", | |
819 | options.local_forwards[i].port, | |
820 | options.local_forwards[i].host, | |
821 | options.local_forwards[i].host_port); | |
5641aefa | 822 | success += channel_setup_local_fwd_listener( |
fa08c86b | 823 | options.local_forwards[i].port, |
824 | options.local_forwards[i].host, | |
825 | options.local_forwards[i].host_port, | |
826 | options.gateway_ports); | |
827 | } | |
02a024dd | 828 | if (i > 0 && success == 0) |
829 | error("Could not request local forwarding."); | |
fa08c86b | 830 | |
831 | /* Initiate remote TCP/IP port forwardings. */ | |
832 | for (i = 0; i < options.num_remote_forwards; i++) { | |
833 | debug("Connections to remote port %d forwarded to local address %.200s:%d", | |
834 | options.remote_forwards[i].port, | |
835 | options.remote_forwards[i].host, | |
836 | options.remote_forwards[i].host_port); | |
837 | channel_request_remote_forwarding( | |
838 | options.remote_forwards[i].port, | |
839 | options.remote_forwards[i].host, | |
840 | options.remote_forwards[i].host_port); | |
841 | } | |
842 | } | |
843 | ||
396c147e | 844 | static void |
fa08c86b | 845 | check_agent_present(void) |
846 | { | |
847 | if (options.forward_agent) { | |
848 | /* Clear agent forwarding if we don\'t have an agent. */ | |
8b10e20e | 849 | if (!ssh_agent_present()) |
fa08c86b | 850 | options.forward_agent = 0; |
fa08c86b | 851 | } |
852 | } | |
853 | ||
396c147e | 854 | static int |
8ce64345 | 855 | ssh_session(void) |
856 | { | |
857 | int type; | |
8ce64345 | 858 | int interactive = 0; |
859 | int have_tty = 0; | |
860 | struct winsize ws; | |
8ce64345 | 861 | char *cp; |
862 | ||
5260325f | 863 | /* Enable compression if requested. */ |
864 | if (options.compression) { | |
865 | debug("Requesting compression at level %d.", options.compression_level); | |
866 | ||
867 | if (options.compression_level < 1 || options.compression_level > 9) | |
868 | fatal("Compression level must be from 1 (fast) to 9 (slow, best)."); | |
869 | ||
870 | /* Send the request. */ | |
871 | packet_start(SSH_CMSG_REQUEST_COMPRESSION); | |
872 | packet_put_int(options.compression_level); | |
873 | packet_send(); | |
874 | packet_write_wait(); | |
54a5250f | 875 | type = packet_read(); |
5260325f | 876 | if (type == SSH_SMSG_SUCCESS) |
877 | packet_start_compression(options.compression_level); | |
878 | else if (type == SSH_SMSG_FAILURE) | |
bbe88b6d | 879 | logit("Warning: Remote host refused compression."); |
5260325f | 880 | else |
881 | packet_disconnect("Protocol error waiting for compression response."); | |
882 | } | |
883 | /* Allocate a pseudo tty if appropriate. */ | |
884 | if (tty_flag) { | |
885 | debug("Requesting pty."); | |
886 | ||
887 | /* Start the packet. */ | |
888 | packet_start(SSH_CMSG_REQUEST_PTY); | |
889 | ||
890 | /* Store TERM in the packet. There is no limit on the | |
891 | length of the string. */ | |
892 | cp = getenv("TERM"); | |
893 | if (!cp) | |
894 | cp = ""; | |
449c5ba5 | 895 | packet_put_cstring(cp); |
5260325f | 896 | |
897 | /* Store window size in the packet. */ | |
898 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) | |
899 | memset(&ws, 0, sizeof(ws)); | |
900 | packet_put_int(ws.ws_row); | |
901 | packet_put_int(ws.ws_col); | |
902 | packet_put_int(ws.ws_xpixel); | |
903 | packet_put_int(ws.ws_ypixel); | |
904 | ||
905 | /* Store tty modes in the packet. */ | |
30dcc918 | 906 | tty_make_modes(fileno(stdin), NULL); |
5260325f | 907 | |
908 | /* Send the packet, and wait for it to leave. */ | |
909 | packet_send(); | |
910 | packet_write_wait(); | |
911 | ||
912 | /* Read response from the server. */ | |
54a5250f | 913 | type = packet_read(); |
4fe2af09 | 914 | if (type == SSH_SMSG_SUCCESS) { |
5260325f | 915 | interactive = 1; |
8ce64345 | 916 | have_tty = 1; |
4fe2af09 | 917 | } else if (type == SSH_SMSG_FAILURE) |
bbe88b6d | 918 | logit("Warning: Remote host failed or refused to allocate a pseudo tty."); |
5260325f | 919 | else |
920 | packet_disconnect("Protocol error waiting for pty request response."); | |
921 | } | |
922 | /* Request X11 forwarding if enabled and DISPLAY is set. */ | |
923 | if (options.forward_x11 && getenv("DISPLAY") != NULL) { | |
b48eeb07 | 924 | char *proto, *data; |
0b242b12 | 925 | /* Get reasonable local authentication information. */ |
b48eeb07 | 926 | x11_get_proto(&proto, &data); |
0b242b12 | 927 | /* Request forwarding with authentication spoofing. */ |
5260325f | 928 | debug("Requesting X11 forwarding with authentication spoofing."); |
0b242b12 | 929 | x11_request_forwarding_with_spoofing(0, proto, data); |
5260325f | 930 | |
931 | /* Read response from the server. */ | |
54a5250f | 932 | type = packet_read(); |
5260325f | 933 | if (type == SSH_SMSG_SUCCESS) { |
5260325f | 934 | interactive = 1; |
0b242b12 | 935 | } else if (type == SSH_SMSG_FAILURE) { |
bbe88b6d | 936 | logit("Warning: Remote host denied X11 forwarding."); |
0b242b12 | 937 | } else { |
5260325f | 938 | packet_disconnect("Protocol error waiting for X11 forwarding"); |
0b242b12 | 939 | } |
5260325f | 940 | } |
941 | /* Tell the packet module whether this is an interactive session. */ | |
b5c334cc | 942 | packet_set_interactive(interactive); |
5260325f | 943 | |
944 | /* Request authentication agent forwarding if appropriate. */ | |
fa08c86b | 945 | check_agent_present(); |
946 | ||
5260325f | 947 | if (options.forward_agent) { |
948 | debug("Requesting authentication agent forwarding."); | |
949 | auth_request_forwarding(); | |
950 | ||
951 | /* Read response from the server. */ | |
54a5250f | 952 | type = packet_read(); |
95500969 | 953 | packet_check_eom(); |
5260325f | 954 | if (type != SSH_SMSG_SUCCESS) |
bbe88b6d | 955 | logit("Warning: Remote host denied authentication agent forwarding."); |
5260325f | 956 | } |
8efc0c15 | 957 | |
fa08c86b | 958 | /* Initiate port forwardings. */ |
959 | ssh_init_forwarding(); | |
5260325f | 960 | |
aa3378df | 961 | /* If requested, let ssh continue in the background. */ |
6ae2364d | 962 | if (fork_after_authentication_flag) |
aa3378df | 963 | if (daemon(1, 1) < 0) |
964 | fatal("daemon() failed: %.200s", strerror(errno)); | |
965 | ||
966 | /* | |
967 | * If a command was specified on the command line, execute the | |
968 | * command now. Otherwise request the server to start a shell. | |
969 | */ | |
5260325f | 970 | if (buffer_len(&command) > 0) { |
971 | int len = buffer_len(&command); | |
972 | if (len > 900) | |
973 | len = 900; | |
6c0fa2b1 | 974 | debug("Sending command: %.*s", len, (u_char *)buffer_ptr(&command)); |
5260325f | 975 | packet_start(SSH_CMSG_EXEC_CMD); |
976 | packet_put_string(buffer_ptr(&command), buffer_len(&command)); | |
977 | packet_send(); | |
978 | packet_write_wait(); | |
979 | } else { | |
980 | debug("Requesting shell."); | |
981 | packet_start(SSH_CMSG_EXEC_SHELL); | |
982 | packet_send(); | |
983 | packet_write_wait(); | |
984 | } | |
985 | ||
986 | /* Enter the interactive session. */ | |
4bf9c10e | 987 | return client_loop(have_tty, tty_flag ? |
988 | options.escape_char : SSH_ESCAPECHAR_NONE, 0); | |
8ce64345 | 989 | } |
5260325f | 990 | |
396c147e | 991 | static void |
7819b5c3 | 992 | client_subsystem_reply(int type, u_int32_t seq, void *ctxt) |
1f3bf5aa | 993 | { |
994 | int id, len; | |
995 | ||
996 | id = packet_get_int(); | |
997 | len = buffer_len(&command); | |
ce91d6f8 | 998 | if (len > 900) |
999 | len = 900; | |
95500969 | 1000 | packet_check_eom(); |
1f3bf5aa | 1001 | if (type == SSH2_MSG_CHANNEL_FAILURE) |
1002 | fatal("Request for subsystem '%.*s' failed on channel %d", | |
6c0fa2b1 | 1003 | len, (u_char *)buffer_ptr(&command), id); |
1f3bf5aa | 1004 | } |
1005 | ||
e0ae8728 | 1006 | void |
1007 | client_global_request_reply(int type, u_int32_t seq, void *ctxt) | |
1008 | { | |
1009 | int i; | |
1010 | ||
1011 | i = client_global_request_id++; | |
1012 | if (i >= options.num_remote_forwards) { | |
1013 | debug("client_global_request_reply: too many replies %d > %d", | |
1014 | i, options.num_remote_forwards); | |
1015 | return; | |
1016 | } | |
1017 | debug("remote forward %s for: listen %d, connect %s:%d", | |
1018 | type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure", | |
1019 | options.remote_forwards[i].port, | |
1020 | options.remote_forwards[i].host, | |
1021 | options.remote_forwards[i].host_port); | |
1022 | if (type == SSH2_MSG_REQUEST_FAILURE) | |
bbe88b6d | 1023 | logit("Warning: remote port forwarding failed for listen port %d", |
e0ae8728 | 1024 | options.remote_forwards[i].port); |
1025 | } | |
1026 | ||
bcdb96c2 | 1027 | /* request pty/x11/agent/tcpfwd/shell for channel */ |
396c147e | 1028 | static void |
bcdb96c2 | 1029 | ssh_session2_setup(int id, void *arg) |
8ce64345 | 1030 | { |
1031 | int len; | |
b5c334cc | 1032 | int interactive = 0; |
30dcc918 | 1033 | struct termios tio; |
b5c334cc | 1034 | |
83bbc162 | 1035 | debug2("ssh_session2_setup: id %d", id); |
8ce64345 | 1036 | |
8ce64345 | 1037 | if (tty_flag) { |
1038 | struct winsize ws; | |
1039 | char *cp; | |
1040 | cp = getenv("TERM"); | |
1041 | if (!cp) | |
1042 | cp = ""; | |
1043 | /* Store window size in the packet. */ | |
1044 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) | |
1045 | memset(&ws, 0, sizeof(ws)); | |
1046 | ||
1047 | channel_request_start(id, "pty-req", 0); | |
1048 | packet_put_cstring(cp); | |
1049 | packet_put_int(ws.ws_col); | |
1050 | packet_put_int(ws.ws_row); | |
1051 | packet_put_int(ws.ws_xpixel); | |
1052 | packet_put_int(ws.ws_ypixel); | |
30dcc918 | 1053 | tio = get_saved_tio(); |
1054 | tty_make_modes(/*ignored*/ 0, &tio); | |
8ce64345 | 1055 | packet_send(); |
b5c334cc | 1056 | interactive = 1; |
8ce64345 | 1057 | /* XXX wait for reply */ |
1058 | } | |
0b242b12 | 1059 | if (options.forward_x11 && |
1060 | getenv("DISPLAY") != NULL) { | |
b48eeb07 | 1061 | char *proto, *data; |
0b242b12 | 1062 | /* Get reasonable local authentication information. */ |
b48eeb07 | 1063 | x11_get_proto(&proto, &data); |
0b242b12 | 1064 | /* Request forwarding with authentication spoofing. */ |
1065 | debug("Requesting X11 forwarding with authentication spoofing."); | |
1066 | x11_request_forwarding_with_spoofing(id, proto, data); | |
b5c334cc | 1067 | interactive = 1; |
0b242b12 | 1068 | /* XXX wait for reply */ |
1069 | } | |
1070 | ||
fa08c86b | 1071 | check_agent_present(); |
1072 | if (options.forward_agent) { | |
1073 | debug("Requesting authentication agent forwarding."); | |
1074 | channel_request_start(id, "auth-agent-req@openssh.com", 0); | |
1075 | packet_send(); | |
1076 | } | |
1077 | ||
8ce64345 | 1078 | len = buffer_len(&command); |
1079 | if (len > 0) { | |
1080 | if (len > 900) | |
1081 | len = 900; | |
ae810de7 | 1082 | if (subsystem_flag) { |
6c0fa2b1 | 1083 | debug("Sending subsystem: %.*s", len, (u_char *)buffer_ptr(&command)); |
1f3bf5aa | 1084 | channel_request_start(id, "subsystem", /*want reply*/ 1); |
1085 | /* register callback for reply */ | |
c242fc96 | 1086 | /* XXX we assume that client_loop has already been called */ |
1f3bf5aa | 1087 | dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &client_subsystem_reply); |
1088 | dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &client_subsystem_reply); | |
ae810de7 | 1089 | } else { |
6c0fa2b1 | 1090 | debug("Sending command: %.*s", len, (u_char *)buffer_ptr(&command)); |
ae810de7 | 1091 | channel_request_start(id, "exec", 0); |
1092 | } | |
ce91d6f8 | 1093 | packet_put_string(buffer_ptr(&command), buffer_len(&command)); |
8ce64345 | 1094 | packet_send(); |
1095 | } else { | |
06ee33fb | 1096 | channel_request_start(id, "shell", 0); |
1097 | packet_send(); | |
8ce64345 | 1098 | } |
1f3bf5aa | 1099 | |
b5c334cc | 1100 | packet_set_interactive(interactive); |
8ce64345 | 1101 | } |
1102 | ||
bcdb96c2 | 1103 | /* open new channel for a session */ |
396c147e | 1104 | static int |
bcdb96c2 | 1105 | ssh_session2_open(void) |
8ce64345 | 1106 | { |
719fc62f | 1107 | Channel *c; |
1108 | int window, packetmax, in, out, err; | |
2e73a022 | 1109 | |
14a9a859 | 1110 | if (stdin_null_flag) { |
5ca51e19 | 1111 | in = open(_PATH_DEVNULL, O_RDONLY); |
14a9a859 | 1112 | } else { |
1113 | in = dup(STDIN_FILENO); | |
1114 | } | |
2e73a022 | 1115 | out = dup(STDOUT_FILENO); |
1116 | err = dup(STDERR_FILENO); | |
8ce64345 | 1117 | |
1118 | if (in < 0 || out < 0 || err < 0) | |
14a9a859 | 1119 | fatal("dup() in/out/err failed"); |
8ce64345 | 1120 | |
a22aff1f | 1121 | /* enable nonblocking unless tty */ |
1122 | if (!isatty(in)) | |
1123 | set_nonblock(in); | |
1124 | if (!isatty(out)) | |
1125 | set_nonblock(out); | |
1126 | if (!isatty(err)) | |
1127 | set_nonblock(err); | |
1128 | ||
bcbf86ec | 1129 | window = CHAN_SES_WINDOW_DEFAULT; |
1130 | packetmax = CHAN_SES_PACKET_DEFAULT; | |
ea9700ba | 1131 | if (tty_flag) { |
1132 | window >>= 1; | |
1133 | packetmax >>= 1; | |
8ce64345 | 1134 | } |
719fc62f | 1135 | c = channel_new( |
8ce64345 | 1136 | "session", SSH_CHANNEL_OPENING, in, out, err, |
bcbf86ec | 1137 | window, packetmax, CHAN_EXTENDED_WRITE, |
0d942eff | 1138 | "client-session", /*nonblock*/0); |
8ce64345 | 1139 | |
bcdb96c2 | 1140 | debug3("ssh_session2_open: channel_new: %d", c->self); |
eb0dd41f | 1141 | |
36e1f6a1 | 1142 | channel_send_open(c->self); |
bcdb96c2 | 1143 | if (!no_shell_flag) |
05ca0898 | 1144 | channel_register_confirm(c->self, ssh_session2_setup); |
5260325f | 1145 | |
719fc62f | 1146 | return c->self; |
eb0dd41f | 1147 | } |
1148 | ||
396c147e | 1149 | static int |
eb0dd41f | 1150 | ssh_session2(void) |
1151 | { | |
bcdb96c2 | 1152 | int id = -1; |
eb0dd41f | 1153 | |
1154 | /* XXX should be pre-session */ | |
1155 | ssh_init_forwarding(); | |
1156 | ||
bcdb96c2 | 1157 | if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN)) |
1158 | id = ssh_session2_open(); | |
eb0dd41f | 1159 | |
1160 | /* If requested, let ssh continue in the background. */ | |
1161 | if (fork_after_authentication_flag) | |
1162 | if (daemon(1, 1) < 0) | |
1163 | fatal("daemon() failed: %.200s", strerror(errno)); | |
1164 | ||
4bf9c10e | 1165 | return client_loop(tty_flag, tty_flag ? |
1166 | options.escape_char : SSH_ESCAPECHAR_NONE, id); | |
8efc0c15 | 1167 | } |
fa08c86b | 1168 | |
396c147e | 1169 | static void |
fee56204 | 1170 | load_public_identity_files(void) |
1171 | { | |
1172 | char *filename; | |
2e23cde0 | 1173 | int i = 0; |
0659cace | 1174 | Key *public; |
383546c4 | 1175 | #ifdef SMARTCARD |
0659cace | 1176 | Key **keys; |
1177 | ||
9ff6f66f | 1178 | if (options.smartcard_device != NULL && |
0659cace | 1179 | options.num_identity_files < SSH_MAX_IDENTITY_FILES && |
1180 | (keys = sc_get_keys(options.smartcard_device, NULL)) != NULL ) { | |
1181 | int count = 0; | |
1182 | for (i = 0; keys[i] != NULL; i++) { | |
1183 | count++; | |
0659cace | 1184 | memmove(&options.identity_files[1], &options.identity_files[0], |
1185 | sizeof(char *) * (SSH_MAX_IDENTITY_FILES - 1)); | |
1186 | memmove(&options.identity_keys[1], &options.identity_keys[0], | |
1187 | sizeof(Key *) * (SSH_MAX_IDENTITY_FILES - 1)); | |
1188 | options.num_identity_files++; | |
1189 | options.identity_keys[0] = keys[i]; | |
244e796f | 1190 | options.identity_files[0] = sc_get_key_label(keys[i]); |
0659cace | 1191 | } |
1c2deed1 | 1192 | if (options.num_identity_files > SSH_MAX_IDENTITY_FILES) |
1193 | options.num_identity_files = SSH_MAX_IDENTITY_FILES; | |
0659cace | 1194 | i = count; |
1195 | xfree(keys); | |
383546c4 | 1196 | } |
3e984472 | 1197 | #endif /* SMARTCARD */ |
2e23cde0 | 1198 | for (; i < options.num_identity_files; i++) { |
1199 | filename = tilde_expand_filename(options.identity_files[i], | |
1200 | original_real_uid); | |
1201 | public = key_load_public(filename, NULL); | |
1202 | debug("identity file %s type %d", filename, | |
1203 | public ? public->type : -1); | |
1204 | xfree(options.identity_files[i]); | |
1205 | options.identity_files[i] = filename; | |
1206 | options.identity_keys[i] = public; | |
1207 | } | |
fee56204 | 1208 | } |