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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" | |
6939bbd4 | 43 | RCSID("$OpenBSD: ssh.c,v 1.186 2002/09/19 01:58:18 djm 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. */ | |
59e76f33 | 84 | #ifdef IPV4_DEFAULT |
85 | int IPv4or6 = AF_INET; | |
86 | #else | |
48e671d5 | 87 | int IPv4or6 = AF_UNSPEC; |
59e76f33 | 88 | #endif |
48e671d5 | 89 | |
5260325f | 90 | /* Flag indicating whether debug mode is on. This can be set on the command line. */ |
8efc0c15 | 91 | int debug_flag = 0; |
92 | ||
a8be9f80 | 93 | /* Flag indicating whether a tty should be allocated */ |
8efc0c15 | 94 | int tty_flag = 0; |
8abcdba4 | 95 | int no_tty_flag = 0; |
96 | int force_tty_flag = 0; | |
8efc0c15 | 97 | |
8ce64345 | 98 | /* don't exec a shell */ |
99 | int no_shell_flag = 0; | |
8ce64345 | 100 | |
aa3378df | 101 | /* |
102 | * Flag indicating that nothing should be read from stdin. This can be set | |
103 | * on the command line. | |
104 | */ | |
8efc0c15 | 105 | int stdin_null_flag = 0; |
106 | ||
aa3378df | 107 | /* |
108 | * Flag indicating that ssh should fork after authentication. This is useful | |
c242fc96 | 109 | * so that the passphrase can be entered manually, and then ssh goes to the |
aa3378df | 110 | * background. |
111 | */ | |
8efc0c15 | 112 | int fork_after_authentication_flag = 0; |
113 | ||
aa3378df | 114 | /* |
115 | * General data structure for command line options and options configurable | |
116 | * in configuration files. See readconf.h. | |
117 | */ | |
8efc0c15 | 118 | Options options; |
119 | ||
e591b98a | 120 | /* optional user configfile */ |
121 | char *config = NULL; | |
122 | ||
aa3378df | 123 | /* |
124 | * Name of the host we are connecting to. This is the name given on the | |
125 | * command line, or the HostName specified for the user-supplied name in a | |
126 | * configuration file. | |
127 | */ | |
8efc0c15 | 128 | char *host; |
129 | ||
130 | /* socket address the host resolves to */ | |
48e671d5 | 131 | struct sockaddr_storage hostaddr; |
8efc0c15 | 132 | |
8002af61 | 133 | /* Private host keys. */ |
39c00dc2 | 134 | Sensitive sensitive_data; |
8efc0c15 | 135 | |
136 | /* Original real UID. */ | |
137 | uid_t original_real_uid; | |
3fb156df | 138 | uid_t original_effective_uid; |
8efc0c15 | 139 | |
8ce64345 | 140 | /* command to be executed */ |
141 | Buffer command; | |
142 | ||
ae810de7 | 143 | /* Should we execute a command or invoke a subsystem? */ |
144 | int subsystem_flag = 0; | |
145 | ||
e0ae8728 | 146 | /* # of replies received for global requests */ |
147 | static int client_global_request_id = 0; | |
148 | ||
6939bbd4 | 149 | /* pid of proxycommand child process */ |
150 | pid_t proxy_command_pid = 0; | |
151 | ||
8efc0c15 | 152 | /* Prints a help message to the user. This function never returns. */ |
153 | ||
396c147e | 154 | static void |
5ca51e19 | 155 | usage(void) |
8efc0c15 | 156 | { |
1fe6a48f | 157 | fprintf(stderr, "Usage: %s [options] host [command]\n", __progname); |
5260325f | 158 | fprintf(stderr, "Options:\n"); |
159 | fprintf(stderr, " -l user Log in using this user name.\n"); | |
5ca51e19 | 160 | fprintf(stderr, " -n Redirect input from " _PATH_DEVNULL ".\n"); |
e591b98a | 161 | fprintf(stderr, " -F config Config file (default: ~/%s).\n", |
162 | _PATH_SSH_USER_CONFFILE); | |
71276795 | 163 | fprintf(stderr, " -A Enable authentication agent forwarding.\n"); |
63cd7dd0 | 164 | fprintf(stderr, " -a Disable authentication agent forwarding (default).\n"); |
8efc0c15 | 165 | #ifdef AFS |
5260325f | 166 | fprintf(stderr, " -k Disable Kerberos ticket and AFS token forwarding.\n"); |
167 | #endif /* AFS */ | |
2b87da3b | 168 | fprintf(stderr, " -X Enable X11 connection forwarding.\n"); |
63cd7dd0 | 169 | fprintf(stderr, " -x Disable X11 connection forwarding (default).\n"); |
a01a5f30 | 170 | fprintf(stderr, " -i file Identity for public key authentication " |
171 | "(default: ~/.ssh/identity)\n"); | |
315dfb04 | 172 | #ifdef SMARTCARD |
173 | fprintf(stderr, " -I reader Set smartcard reader.\n"); | |
dd2495cb | 174 | #endif |
5260325f | 175 | fprintf(stderr, " -t Tty; allocate a tty even if command is given.\n"); |
8ce64345 | 176 | fprintf(stderr, " -T Do not allocate a tty.\n"); |
5260325f | 177 | fprintf(stderr, " -v Verbose; display verbose debugging messages.\n"); |
bcbf86ec | 178 | fprintf(stderr, " Multiple -v increases verbosity.\n"); |
5260325f | 179 | fprintf(stderr, " -V Display version number only.\n"); |
5260325f | 180 | fprintf(stderr, " -q Quiet; don't display any warning messages.\n"); |
181 | fprintf(stderr, " -f Fork into background after authentication.\n"); | |
182 | fprintf(stderr, " -e char Set escape character; ``none'' = disable (default: ~).\n"); | |
183 | ||
63cd7dd0 | 184 | fprintf(stderr, " -c cipher Select encryption algorithm\n"); |
38967add | 185 | fprintf(stderr, " -m macs Specify MAC algorithms for protocol version 2.\n"); |
5260325f | 186 | fprintf(stderr, " -p port Connect to this port. Server must be on the same port.\n"); |
187 | fprintf(stderr, " -L listen-port:host:port Forward local port to remote address\n"); | |
188 | fprintf(stderr, " -R listen-port:host:port Forward remote port to local address\n"); | |
1fe6a48f | 189 | fprintf(stderr, " These cause %s to listen for connections on a port, and\n", __progname); |
5260325f | 190 | fprintf(stderr, " forward them to the other side by connecting to host:port.\n"); |
4c780c2a | 191 | fprintf(stderr, " -D port Enable dynamic application-level port forwarding.\n"); |
5260325f | 192 | fprintf(stderr, " -C Enable compression.\n"); |
8ce64345 | 193 | fprintf(stderr, " -N Do not execute a shell or command.\n"); |
5260325f | 194 | fprintf(stderr, " -g Allow remote hosts to connect to forwarded ports.\n"); |
1f3bf5aa | 195 | fprintf(stderr, " -1 Force protocol version 1.\n"); |
196 | fprintf(stderr, " -2 Force protocol version 2.\n"); | |
48e671d5 | 197 | fprintf(stderr, " -4 Use IPv4 only.\n"); |
198 | fprintf(stderr, " -6 Use IPv6 only.\n"); | |
5260325f | 199 | fprintf(stderr, " -o 'option' Process the option as if it was read from a configuration file.\n"); |
ae810de7 | 200 | fprintf(stderr, " -s Invoke command (mandatory) as SSH2 subsystem.\n"); |
63cd7dd0 | 201 | fprintf(stderr, " -b addr Local IP address.\n"); |
5260325f | 202 | exit(1); |
8efc0c15 | 203 | } |
204 | ||
396c147e | 205 | static int ssh_session(void); |
206 | static int ssh_session2(void); | |
207 | static void load_public_identity_files(void); | |
8ce64345 | 208 | |
5260325f | 209 | /* |
210 | * Main program for the ssh client. | |
211 | */ | |
8efc0c15 | 212 | int |
213 | main(int ac, char **av) | |
214 | { | |
b34bec32 | 215 | int i, opt, exit_status; |
57112b5a | 216 | u_short fwd_port, fwd_host_port; |
d2e3df16 | 217 | char sfwd_port[6], sfwd_host_port[6]; |
f5a1a01a | 218 | char *p, *cp, buf[256]; |
5260325f | 219 | struct stat st; |
3b1a83df | 220 | struct passwd *pw; |
8ce64345 | 221 | int dummy; |
57dade33 | 222 | extern int optind, optreset; |
1812a662 | 223 | extern char *optarg; |
5260325f | 224 | |
260d427b | 225 | __progname = get_progname(av[0]); |
264dce47 | 226 | init_rng(); |
227 | ||
aa3378df | 228 | /* |
229 | * Save the original real uid. It will be needed later (uid-swapping | |
230 | * may clobber the real uid). | |
231 | */ | |
5260325f | 232 | original_real_uid = getuid(); |
233 | original_effective_uid = geteuid(); | |
9f324470 | 234 | |
235 | /* | |
236 | * Use uid-swapping to give up root privileges for the duration of | |
237 | * option processing. We will re-instantiate the rights when we are | |
238 | * ready to create the privileged port, and will permanently drop | |
239 | * them when the port has been created (actually, when the connection | |
240 | * has been made, as we may need to create the port several times). | |
241 | */ | |
242 | PRIV_END; | |
5260325f | 243 | |
7322ef0e | 244 | #ifdef HAVE_SETRLIMIT |
5260325f | 245 | /* If we are installed setuid root be careful to not drop core. */ |
246 | if (original_real_uid != original_effective_uid) { | |
247 | struct rlimit rlim; | |
248 | rlim.rlim_cur = rlim.rlim_max = 0; | |
249 | if (setrlimit(RLIMIT_CORE, &rlim) < 0) | |
250 | fatal("setrlimit failed: %.100s", strerror(errno)); | |
8efc0c15 | 251 | } |
3c62e7eb | 252 | #endif |
63bd8c36 | 253 | /* Get user data. */ |
254 | pw = getpwuid(original_real_uid); | |
255 | if (!pw) { | |
256 | log("You don't exist, go away!"); | |
257 | exit(1); | |
258 | } | |
259 | /* Take a copy of the returned structure. */ | |
260 | pw = pwcopy(pw); | |
261 | ||
aa3378df | 262 | /* |
263 | * Set our umask to something reasonable, as some files are created | |
264 | * with the default umask. This will make them world-readable but | |
265 | * writable only by the owner, which is ok for all files for which we | |
266 | * don't set the modes explicitly. | |
267 | */ | |
5260325f | 268 | umask(022); |
269 | ||
5260325f | 270 | /* Initialize option structure to indicate that no values have been set. */ |
271 | initialize_options(&options); | |
272 | ||
273 | /* Parse command-line arguments. */ | |
274 | host = NULL; | |
275 | ||
f5a1a01a | 276 | again: |
277 | while ((opt = getopt(ac, av, | |
e591b98a | 278 | "1246ab:c:e:fgi:kl:m:no:p:qstvxACD:F:I:L:NPR:TVX")) != -1) { |
5260325f | 279 | switch (opt) { |
1f3bf5aa | 280 | case '1': |
281 | options.protocol = SSH_PROTO_1; | |
282 | break; | |
6ae2364d | 283 | case '2': |
284 | options.protocol = SSH_PROTO_2; | |
285 | break; | |
48e671d5 | 286 | case '4': |
287 | IPv4or6 = AF_INET; | |
288 | break; | |
48e671d5 | 289 | case '6': |
290 | IPv4or6 = AF_INET6; | |
291 | break; | |
5260325f | 292 | case 'n': |
293 | stdin_null_flag = 1; | |
294 | break; | |
5260325f | 295 | case 'f': |
296 | fork_after_authentication_flag = 1; | |
297 | stdin_null_flag = 1; | |
298 | break; | |
5260325f | 299 | case 'x': |
300 | options.forward_x11 = 0; | |
301 | break; | |
5260325f | 302 | case 'X': |
303 | options.forward_x11 = 1; | |
304 | break; | |
5260325f | 305 | case 'g': |
306 | options.gateway_ports = 1; | |
307 | break; | |
e59404d1 | 308 | case 'P': /* deprecated */ |
5260325f | 309 | options.use_privileged_port = 0; |
310 | break; | |
5260325f | 311 | case 'a': |
312 | options.forward_agent = 0; | |
313 | break; | |
71276795 | 314 | case 'A': |
315 | options.forward_agent = 1; | |
316 | break; | |
5260325f | 317 | #ifdef AFS |
318 | case 'k': | |
319 | options.kerberos_tgt_passing = 0; | |
320 | options.afs_token_passing = 0; | |
321 | break; | |
322 | #endif | |
323 | case 'i': | |
324 | if (stat(optarg, &st) < 0) { | |
f5a1a01a | 325 | fprintf(stderr, "Warning: Identity file %s " |
326 | "does not exist.\n", optarg); | |
5260325f | 327 | break; |
328 | } | |
f5a1a01a | 329 | if (options.num_identity_files >= |
330 | SSH_MAX_IDENTITY_FILES) | |
331 | fatal("Too many identity files specified " | |
332 | "(max %d)", SSH_MAX_IDENTITY_FILES); | |
333 | options.identity_files[options.num_identity_files++] = | |
334 | xstrdup(optarg); | |
5260325f | 335 | break; |
383546c4 | 336 | case 'I': |
337 | #ifdef SMARTCARD | |
9ff6f66f | 338 | options.smartcard_device = xstrdup(optarg); |
dd2495cb | 339 | #else |
383546c4 | 340 | fprintf(stderr, "no support for smartcards.\n"); |
dd2495cb | 341 | #endif |
383546c4 | 342 | break; |
5260325f | 343 | case 't': |
8abcdba4 | 344 | if (tty_flag) |
345 | force_tty_flag = 1; | |
5260325f | 346 | tty_flag = 1; |
347 | break; | |
5260325f | 348 | case 'v': |
bcbf86ec | 349 | if (0 == debug_flag) { |
350 | debug_flag = 1; | |
351 | options.log_level = SYSLOG_LEVEL_DEBUG1; | |
352 | } else if (options.log_level < SYSLOG_LEVEL_DEBUG3) { | |
353 | options.log_level++; | |
354 | break; | |
f5a1a01a | 355 | } else |
54b974dc | 356 | fatal("Too high debugging level."); |
bcbf86ec | 357 | /* fallthrough */ |
5260325f | 358 | case 'V': |
e68225b2 | 359 | fprintf(stderr, |
360 | "%s, SSH protocols %d.%d/%d.%d, OpenSSL 0x%8.8lx\n", | |
a8be9f80 | 361 | SSH_VERSION, |
362 | PROTOCOL_MAJOR_1, PROTOCOL_MINOR_1, | |
e68225b2 | 363 | PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2, |
364 | SSLeay()); | |
5260325f | 365 | if (opt == 'V') |
366 | exit(0); | |
5260325f | 367 | break; |
5260325f | 368 | case 'q': |
369 | options.log_level = SYSLOG_LEVEL_QUIET; | |
370 | break; | |
5260325f | 371 | case 'e': |
372 | if (optarg[0] == '^' && optarg[2] == 0 && | |
f5a1a01a | 373 | (u_char) optarg[1] >= 64 && |
374 | (u_char) optarg[1] < 128) | |
1e3b8b07 | 375 | options.escape_char = (u_char) optarg[1] & 31; |
5260325f | 376 | else if (strlen(optarg) == 1) |
1e3b8b07 | 377 | options.escape_char = (u_char) optarg[0]; |
5260325f | 378 | else if (strcmp(optarg, "none") == 0) |
4bf9c10e | 379 | options.escape_char = SSH_ESCAPECHAR_NONE; |
5260325f | 380 | else { |
f5a1a01a | 381 | fprintf(stderr, "Bad escape character '%s'.\n", |
382 | optarg); | |
5260325f | 383 | exit(1); |
384 | } | |
385 | break; | |
5260325f | 386 | case 'c': |
a306f2dd | 387 | if (ciphers_valid(optarg)) { |
388 | /* SSH2 only */ | |
389 | options.ciphers = xstrdup(optarg); | |
d0c832f3 | 390 | options.cipher = SSH_CIPHER_ILLEGAL; |
a306f2dd | 391 | } else { |
392 | /* SSH1 only */ | |
c523303b | 393 | options.cipher = cipher_number(optarg); |
394 | if (options.cipher == -1) { | |
f5a1a01a | 395 | fprintf(stderr, |
396 | "Unknown cipher type '%s'\n", | |
397 | optarg); | |
a306f2dd | 398 | exit(1); |
399 | } | |
f5a1a01a | 400 | if (options.cipher == SSH_CIPHER_3DES) |
c523303b | 401 | options.ciphers = "3des-cbc"; |
f5a1a01a | 402 | else if (options.cipher == SSH_CIPHER_BLOWFISH) |
c523303b | 403 | options.ciphers = "blowfish-cbc"; |
f5a1a01a | 404 | else |
c523303b | 405 | options.ciphers = (char *)-1; |
5260325f | 406 | } |
407 | break; | |
b2552997 | 408 | case 'm': |
409 | if (mac_valid(optarg)) | |
410 | options.macs = xstrdup(optarg); | |
411 | else { | |
f5a1a01a | 412 | fprintf(stderr, "Unknown mac type '%s'\n", |
413 | optarg); | |
b2552997 | 414 | exit(1); |
415 | } | |
416 | break; | |
5260325f | 417 | case 'p': |
2d2a2c65 | 418 | options.port = a2port(optarg); |
419 | if (options.port == 0) { | |
6031af8d | 420 | fprintf(stderr, "Bad port '%s'\n", optarg); |
421 | exit(1); | |
422 | } | |
5260325f | 423 | break; |
5260325f | 424 | case 'l': |
425 | options.user = optarg; | |
426 | break; | |
d2e3df16 | 427 | |
428 | case 'L': | |
5260325f | 429 | case 'R': |
d2e3df16 | 430 | if (sscanf(optarg, "%5[0-9]:%255[^:]:%5[0-9]", |
431 | sfwd_port, buf, sfwd_host_port) != 3 && | |
432 | sscanf(optarg, "%5[0-9]/%255[^/]/%5[0-9]", | |
433 | sfwd_port, buf, sfwd_host_port) != 3) { | |
f5a1a01a | 434 | fprintf(stderr, |
d2e3df16 | 435 | "Bad forwarding specification '%s'\n", |
f5a1a01a | 436 | optarg); |
5260325f | 437 | usage(); |
438 | /* NOTREACHED */ | |
439 | } | |
d2e3df16 | 440 | if ((fwd_port = a2port(sfwd_port)) == 0 || |
762715ce | 441 | (fwd_host_port = a2port(sfwd_host_port)) == 0) { |
f5a1a01a | 442 | fprintf(stderr, |
d2e3df16 | 443 | "Bad forwarding port(s) '%s'\n", optarg); |
444 | exit(1); | |
5260325f | 445 | } |
d2e3df16 | 446 | if (opt == 'L') |
447 | add_local_forward(&options, fwd_port, buf, | |
448 | fwd_host_port); | |
449 | else if (opt == 'R') | |
450 | add_remote_forward(&options, fwd_port, buf, | |
184eed6a | 451 | fwd_host_port); |
5260325f | 452 | break; |
0490e609 | 453 | |
454 | case 'D': | |
2d2a2c65 | 455 | fwd_port = a2port(optarg); |
456 | if (fwd_port == 0) { | |
f5a1a01a | 457 | fprintf(stderr, "Bad dynamic port '%s'\n", |
458 | optarg); | |
6031af8d | 459 | exit(1); |
460 | } | |
0490e609 | 461 | add_local_forward(&options, fwd_port, "socks4", 0); |
462 | break; | |
463 | ||
5260325f | 464 | case 'C': |
465 | options.compression = 1; | |
466 | break; | |
8ce64345 | 467 | case 'N': |
468 | no_shell_flag = 1; | |
469 | no_tty_flag = 1; | |
470 | break; | |
8ce64345 | 471 | case 'T': |
472 | no_tty_flag = 1; | |
473 | break; | |
5260325f | 474 | case 'o': |
475 | dummy = 1; | |
f5a1a01a | 476 | if (process_config_line(&options, host ? host : "", |
477 | optarg, "command-line", 0, &dummy) != 0) | |
5260325f | 478 | exit(1); |
479 | break; | |
ae810de7 | 480 | case 's': |
481 | subsystem_flag = 1; | |
482 | break; | |
3435f5a6 | 483 | case 'b': |
484 | options.bind_address = optarg; | |
485 | break; | |
e591b98a | 486 | case 'F': |
487 | config = optarg; | |
488 | break; | |
5260325f | 489 | default: |
490 | usage(); | |
491 | } | |
492 | } | |
493 | ||
f5a1a01a | 494 | ac -= optind; |
495 | av += optind; | |
496 | ||
497 | if (ac > 0 && !host && **av != '-') { | |
498 | if (strchr(*av, '@')) { | |
499 | p = xstrdup(*av); | |
500 | cp = strchr(p, '@'); | |
501 | if (cp == NULL || cp == p) | |
502 | usage(); | |
503 | options.user = p; | |
504 | *cp = '\0'; | |
505 | host = ++cp; | |
506 | } else | |
507 | host = *av; | |
508 | ac--, av++; | |
509 | if (ac > 0) { | |
510 | optind = 0; | |
511 | optreset = 1; | |
512 | goto again; | |
513 | } | |
514 | } | |
515 | ||
5260325f | 516 | /* Check that we got a host name. */ |
517 | if (!host) | |
8efc0c15 | 518 | usage(); |
5260325f | 519 | |
22d89d24 | 520 | SSLeay_add_all_algorithms(); |
fa08c86b | 521 | ERR_load_crypto_strings(); |
5e4a7219 | 522 | channel_set_af(IPv4or6); |
22d89d24 | 523 | |
5260325f | 524 | /* Initialize the command to execute on remote host. */ |
525 | buffer_init(&command); | |
526 | ||
aa3378df | 527 | /* |
528 | * Save the command to execute on the remote host in a buffer. There | |
529 | * is no limit on the length of the command, except by the maximum | |
530 | * packet size. Also sets the tty flag if there is no command. | |
531 | */ | |
f5a1a01a | 532 | if (!ac) { |
5260325f | 533 | /* No command specified - execute shell on a tty. */ |
534 | tty_flag = 1; | |
ae810de7 | 535 | if (subsystem_flag) { |
f5a1a01a | 536 | fprintf(stderr, |
537 | "You must specify a subsystem to invoke.\n"); | |
ae810de7 | 538 | usage(); |
539 | } | |
5260325f | 540 | } else { |
f5a1a01a | 541 | /* A command has been specified. Store it into the buffer. */ |
542 | for (i = 0; i < ac; i++) { | |
543 | if (i) | |
5260325f | 544 | buffer_append(&command, " ", 1); |
545 | buffer_append(&command, av[i], strlen(av[i])); | |
546 | } | |
8efc0c15 | 547 | } |
5260325f | 548 | |
549 | /* Cannot fork to background if no command. */ | |
14a9a859 | 550 | if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag) |
5260325f | 551 | fatal("Cannot fork into background without a command to execute."); |
552 | ||
553 | /* Allocate a tty by default if no command specified. */ | |
554 | if (buffer_len(&command) == 0) | |
555 | tty_flag = 1; | |
556 | ||
343288b8 | 557 | /* Force no tty */ |
0b6fbf03 | 558 | if (no_tty_flag) |
559 | tty_flag = 0; | |
5260325f | 560 | /* Do not allocate a tty if stdin is not a tty. */ |
8abcdba4 | 561 | if (!isatty(fileno(stdin)) && !force_tty_flag) { |
5260325f | 562 | if (tty_flag) |
54b974dc | 563 | log("Pseudo-terminal will not be allocated because stdin is not a terminal."); |
5260325f | 564 | tty_flag = 0; |
565 | } | |
8ce64345 | 566 | |
20244695 | 567 | /* |
568 | * Initialize "log" output. Since we are the client all output | |
569 | * actually goes to stderr. | |
570 | */ | |
cc44f691 | 571 | log_init(av[0], options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level, |
572 | SYSLOG_FACILITY_USER, 1); | |
5260325f | 573 | |
e591b98a | 574 | /* |
575 | * Read per-user configuration file. Ignore the system wide config | |
576 | * file if the user specifies a config file on the command line. | |
577 | */ | |
578 | if (config != NULL) { | |
93111dfa | 579 | if (!read_config_file(config, host, &options)) |
580 | fatal("Can't open user config file %.100s: " | |
581 | "%.100s", config, strerror(errno)); | |
e591b98a | 582 | } else { |
583 | snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, | |
584 | _PATH_SSH_USER_CONFFILE); | |
f67792f2 | 585 | (void)read_config_file(buf, host, &options); |
e591b98a | 586 | |
f67792f2 | 587 | /* Read systemwide configuration file after use config. */ |
93111dfa | 588 | (void)read_config_file(_PATH_HOST_CONFIG_FILE, host, &options); |
e591b98a | 589 | } |
5260325f | 590 | |
591 | /* Fill configuration defaults. */ | |
592 | fill_default_options(&options); | |
593 | ||
594 | /* reinit */ | |
20244695 | 595 | log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 1); |
5260325f | 596 | |
e339aa53 | 597 | seed_rng(); |
598 | ||
5260325f | 599 | if (options.user == NULL) |
600 | options.user = xstrdup(pw->pw_name); | |
601 | ||
602 | if (options.hostname != NULL) | |
603 | host = options.hostname; | |
604 | ||
5260325f | 605 | /* Disable rhosts authentication if not running as root. */ |
3c62e7eb | 606 | #ifdef HAVE_CYGWIN |
607 | /* Ignore uid if running under Windows */ | |
608 | if (!options.use_privileged_port) { | |
609 | #else | |
5260325f | 610 | if (original_effective_uid != 0 || !options.use_privileged_port) { |
3c62e7eb | 611 | #endif |
6ffc9c88 | 612 | debug("Rhosts Authentication disabled, " |
613 | "originating port will not be trusted."); | |
5260325f | 614 | options.rhosts_authentication = 0; |
5260325f | 615 | } |
6ffc9c88 | 616 | /* Open a connection to the remote host. */ |
5260325f | 617 | |
b34bec32 | 618 | if (ssh_connect(host, &hostaddr, options.port, IPv4or6, |
6ffc9c88 | 619 | options.connection_attempts, |
d514c907 | 620 | #ifdef HAVE_CYGWIN |
621 | options.use_privileged_port, | |
622 | #else | |
3fb156df | 623 | original_effective_uid == 0 && options.use_privileged_port, |
d514c907 | 624 | #endif |
de60473e | 625 | options.proxy_command) != 0) |
b34bec32 | 626 | exit(1); |
5260325f | 627 | |
aa3378df | 628 | /* |
629 | * If we successfully made the connection, load the host private key | |
630 | * in case we will need it later for combined rsa-rhosts | |
631 | * authentication. This must be done before releasing extra | |
632 | * privileges, because the file is only readable by root. | |
78660ed4 | 633 | * If we cannot access the private keys, load the public keys |
634 | * instead and try to execute the ssh-keysign helper instead. | |
aa3378df | 635 | */ |
8002af61 | 636 | sensitive_data.nkeys = 0; |
637 | sensitive_data.keys = NULL; | |
39c00dc2 | 638 | sensitive_data.external_keysign = 0; |
b34bec32 | 639 | if (options.rhosts_rsa_authentication || |
640 | options.hostbased_authentication) { | |
8002af61 | 641 | sensitive_data.nkeys = 3; |
343288b8 | 642 | sensitive_data.keys = xmalloc(sensitive_data.nkeys * |
643 | sizeof(Key)); | |
3fb156df | 644 | |
645 | PRIV_START; | |
8002af61 | 646 | sensitive_data.keys[0] = key_load_private_type(KEY_RSA1, |
aeaa3d9e | 647 | _PATH_HOST_KEY_FILE, "", NULL); |
8002af61 | 648 | sensitive_data.keys[1] = key_load_private_type(KEY_DSA, |
649 | _PATH_HOST_DSA_KEY_FILE, "", NULL); | |
650 | sensitive_data.keys[2] = key_load_private_type(KEY_RSA, | |
651 | _PATH_HOST_RSA_KEY_FILE, "", NULL); | |
3fb156df | 652 | PRIV_END; |
39c00dc2 | 653 | |
60cd0a97 | 654 | if (options.hostbased_authentication == 1 && |
655 | sensitive_data.keys[0] == NULL && | |
39c00dc2 | 656 | sensitive_data.keys[1] == NULL && |
657 | sensitive_data.keys[2] == NULL) { | |
658 | sensitive_data.keys[1] = key_load_public( | |
659 | _PATH_HOST_DSA_KEY_FILE, NULL); | |
660 | sensitive_data.keys[2] = key_load_public( | |
661 | _PATH_HOST_RSA_KEY_FILE, NULL); | |
662 | sensitive_data.external_keysign = 1; | |
663 | } | |
5260325f | 664 | } |
aa3378df | 665 | /* |
666 | * Get rid of any extra privileges that we may have. We will no | |
667 | * longer need them. Also, extra privileges could make it very hard | |
668 | * to read identity files and other non-world-readable files from the | |
669 | * user's home directory if it happens to be on a NFS volume where | |
670 | * root is mapped to nobody. | |
671 | */ | |
3fb156df | 672 | seteuid(original_real_uid); |
673 | setuid(original_real_uid); | |
5260325f | 674 | |
aa3378df | 675 | /* |
676 | * Now that we are back to our own permissions, create ~/.ssh | |
677 | * directory if it doesn\'t already exist. | |
678 | */ | |
c3abff07 | 679 | snprintf(buf, sizeof buf, "%.100s%s%.100s", pw->pw_dir, strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR); |
5260325f | 680 | if (stat(buf, &st) < 0) |
704b1659 | 681 | if (mkdir(buf, 0700) < 0) |
5260325f | 682 | error("Could not create directory '%.200s'.", buf); |
683 | ||
fee56204 | 684 | /* load options.identity_files */ |
685 | load_public_identity_files(); | |
686 | ||
687 | /* Expand ~ in known host file names. */ | |
688 | /* XXX mem-leaks: */ | |
fa08c86b | 689 | options.system_hostfile = |
690 | tilde_expand_filename(options.system_hostfile, original_real_uid); | |
691 | options.user_hostfile = | |
692 | tilde_expand_filename(options.user_hostfile, original_real_uid); | |
693 | options.system_hostfile2 = | |
694 | tilde_expand_filename(options.system_hostfile2, original_real_uid); | |
695 | options.user_hostfile2 = | |
696 | tilde_expand_filename(options.user_hostfile2, original_real_uid); | |
5260325f | 697 | |
67b75437 | 698 | signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */ |
699 | ||
5260325f | 700 | /* Log into the remote system. This never returns if the login fails. */ |
39c00dc2 | 701 | ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr, pw); |
8002af61 | 702 | |
703 | /* We no longer need the private host keys. Clear them now. */ | |
704 | if (sensitive_data.nkeys != 0) { | |
705 | for (i = 0; i < sensitive_data.nkeys; i++) { | |
706 | if (sensitive_data.keys[i] != NULL) { | |
707 | /* Destroys contents safely */ | |
708 | debug3("clear hostkey %d", i); | |
709 | key_free(sensitive_data.keys[i]); | |
710 | sensitive_data.keys[i] = NULL; | |
711 | } | |
712 | } | |
713 | xfree(sensitive_data.keys); | |
714 | } | |
05b7537a | 715 | for (i = 0; i < options.num_identity_files; i++) { |
716 | if (options.identity_files[i]) { | |
717 | xfree(options.identity_files[i]); | |
718 | options.identity_files[i] = NULL; | |
719 | } | |
720 | if (options.identity_keys[i]) { | |
721 | key_free(options.identity_keys[i]); | |
722 | options.identity_keys[i] = NULL; | |
723 | } | |
724 | } | |
5260325f | 725 | |
8ce64345 | 726 | exit_status = compat20 ? ssh_session2() : ssh_session(); |
727 | packet_close(); | |
6939bbd4 | 728 | |
729 | /* | |
730 | * Send SIGHUP to proxy command if used. We don't wait() in | |
731 | * case it hangs and instead rely on init to reap the child | |
732 | */ | |
733 | if (proxy_command_pid > 1) | |
734 | kill(proxy_command_pid, SIGHUP); | |
735 | ||
8ce64345 | 736 | return exit_status; |
737 | } | |
738 | ||
396c147e | 739 | static void |
b48eeb07 | 740 | x11_get_proto(char **_proto, char **_data) |
0b242b12 | 741 | { |
742 | char line[512]; | |
b48eeb07 | 743 | static char proto[512], data[512]; |
0b242b12 | 744 | FILE *f; |
745 | int got_data = 0, i; | |
75a624f0 | 746 | char *display; |
5d185586 | 747 | struct stat st; |
0b242b12 | 748 | |
b48eeb07 | 749 | *_proto = proto; |
750 | *_data = data; | |
751 | proto[0] = data[0] = '\0'; | |
5d185586 | 752 | if (!options.xauth_location || |
753 | (stat(options.xauth_location, &st) == -1)) { | |
754 | debug("No xauth program."); | |
755 | } else { | |
756 | if ((display = getenv("DISPLAY")) == NULL) { | |
757 | debug("x11_get_proto: DISPLAY not set"); | |
758 | return; | |
759 | } | |
fa649821 | 760 | /* Try to get Xauthority information for the display. */ |
75a624f0 | 761 | if (strncmp(display, "localhost:", 10) == 0) |
762 | /* | |
763 | * Handle FamilyLocal case where $DISPLAY does | |
764 | * not match an authorization entry. For this we | |
765 | * just try "xauth list unix:displaynum.screennum". | |
766 | * XXX: "localhost" match to determine FamilyLocal | |
767 | * is not perfect. | |
768 | */ | |
375e20e7 | 769 | snprintf(line, sizeof line, "%s list unix:%s 2>" |
75a624f0 | 770 | _PATH_DEVNULL, options.xauth_location, display+10); |
771 | else | |
375e20e7 | 772 | snprintf(line, sizeof line, "%s list %.200s 2>" |
75a624f0 | 773 | _PATH_DEVNULL, options.xauth_location, display); |
5d185586 | 774 | debug2("x11_get_proto: %s", line); |
fa649821 | 775 | f = popen(line, "r"); |
776 | if (f && fgets(line, sizeof(line), f) && | |
b48eeb07 | 777 | sscanf(line, "%*s %511s %511s", proto, data) == 2) |
fa649821 | 778 | got_data = 1; |
779 | if (f) | |
780 | pclose(f); | |
781 | } | |
0b242b12 | 782 | /* |
783 | * If we didn't get authentication data, just make up some | |
784 | * data. The forwarding code will check the validity of the | |
785 | * response anyway, and substitute this data. The X11 | |
786 | * server, however, will ignore this fake data and use | |
787 | * whatever authentication mechanisms it was using otherwise | |
788 | * for the local connection. | |
789 | */ | |
790 | if (!got_data) { | |
791 | u_int32_t rand = 0; | |
792 | ||
5d185586 | 793 | log("Warning: No xauth data; using fake authentication data for X11 forwarding."); |
b48eeb07 | 794 | strlcpy(proto, "MIT-MAGIC-COOKIE-1", sizeof proto); |
0b242b12 | 795 | for (i = 0; i < 16; i++) { |
796 | if (i % 4 == 0) | |
797 | rand = arc4random(); | |
b48eeb07 | 798 | snprintf(data + 2 * i, sizeof data - 2 * i, "%02x", rand & 0xff); |
0b242b12 | 799 | rand >>= 8; |
800 | } | |
801 | } | |
802 | } | |
803 | ||
396c147e | 804 | static void |
fa08c86b | 805 | ssh_init_forwarding(void) |
806 | { | |
02a024dd | 807 | int success = 0; |
fa08c86b | 808 | int i; |
02a024dd | 809 | |
fa08c86b | 810 | /* Initiate local TCP/IP port forwardings. */ |
811 | for (i = 0; i < options.num_local_forwards; i++) { | |
812 | debug("Connections to local port %d forwarded to remote address %.200s:%d", | |
813 | options.local_forwards[i].port, | |
814 | options.local_forwards[i].host, | |
815 | options.local_forwards[i].host_port); | |
5641aefa | 816 | success += channel_setup_local_fwd_listener( |
fa08c86b | 817 | options.local_forwards[i].port, |
818 | options.local_forwards[i].host, | |
819 | options.local_forwards[i].host_port, | |
820 | options.gateway_ports); | |
821 | } | |
02a024dd | 822 | if (i > 0 && success == 0) |
823 | error("Could not request local forwarding."); | |
fa08c86b | 824 | |
825 | /* Initiate remote TCP/IP port forwardings. */ | |
826 | for (i = 0; i < options.num_remote_forwards; i++) { | |
827 | debug("Connections to remote port %d forwarded to local address %.200s:%d", | |
828 | options.remote_forwards[i].port, | |
829 | options.remote_forwards[i].host, | |
830 | options.remote_forwards[i].host_port); | |
831 | channel_request_remote_forwarding( | |
832 | options.remote_forwards[i].port, | |
833 | options.remote_forwards[i].host, | |
834 | options.remote_forwards[i].host_port); | |
835 | } | |
836 | } | |
837 | ||
396c147e | 838 | static void |
fa08c86b | 839 | check_agent_present(void) |
840 | { | |
841 | if (options.forward_agent) { | |
842 | /* Clear agent forwarding if we don\'t have an agent. */ | |
8b10e20e | 843 | if (!ssh_agent_present()) |
fa08c86b | 844 | options.forward_agent = 0; |
fa08c86b | 845 | } |
846 | } | |
847 | ||
396c147e | 848 | static int |
8ce64345 | 849 | ssh_session(void) |
850 | { | |
851 | int type; | |
8ce64345 | 852 | int interactive = 0; |
853 | int have_tty = 0; | |
854 | struct winsize ws; | |
8ce64345 | 855 | char *cp; |
856 | ||
5260325f | 857 | /* Enable compression if requested. */ |
858 | if (options.compression) { | |
859 | debug("Requesting compression at level %d.", options.compression_level); | |
860 | ||
861 | if (options.compression_level < 1 || options.compression_level > 9) | |
862 | fatal("Compression level must be from 1 (fast) to 9 (slow, best)."); | |
863 | ||
864 | /* Send the request. */ | |
865 | packet_start(SSH_CMSG_REQUEST_COMPRESSION); | |
866 | packet_put_int(options.compression_level); | |
867 | packet_send(); | |
868 | packet_write_wait(); | |
54a5250f | 869 | type = packet_read(); |
5260325f | 870 | if (type == SSH_SMSG_SUCCESS) |
871 | packet_start_compression(options.compression_level); | |
872 | else if (type == SSH_SMSG_FAILURE) | |
873 | log("Warning: Remote host refused compression."); | |
874 | else | |
875 | packet_disconnect("Protocol error waiting for compression response."); | |
876 | } | |
877 | /* Allocate a pseudo tty if appropriate. */ | |
878 | if (tty_flag) { | |
879 | debug("Requesting pty."); | |
880 | ||
881 | /* Start the packet. */ | |
882 | packet_start(SSH_CMSG_REQUEST_PTY); | |
883 | ||
884 | /* Store TERM in the packet. There is no limit on the | |
885 | length of the string. */ | |
886 | cp = getenv("TERM"); | |
887 | if (!cp) | |
888 | cp = ""; | |
449c5ba5 | 889 | packet_put_cstring(cp); |
5260325f | 890 | |
891 | /* Store window size in the packet. */ | |
892 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) | |
893 | memset(&ws, 0, sizeof(ws)); | |
894 | packet_put_int(ws.ws_row); | |
895 | packet_put_int(ws.ws_col); | |
896 | packet_put_int(ws.ws_xpixel); | |
897 | packet_put_int(ws.ws_ypixel); | |
898 | ||
899 | /* Store tty modes in the packet. */ | |
30dcc918 | 900 | tty_make_modes(fileno(stdin), NULL); |
5260325f | 901 | |
902 | /* Send the packet, and wait for it to leave. */ | |
903 | packet_send(); | |
904 | packet_write_wait(); | |
905 | ||
906 | /* Read response from the server. */ | |
54a5250f | 907 | type = packet_read(); |
4fe2af09 | 908 | if (type == SSH_SMSG_SUCCESS) { |
5260325f | 909 | interactive = 1; |
8ce64345 | 910 | have_tty = 1; |
4fe2af09 | 911 | } else if (type == SSH_SMSG_FAILURE) |
5260325f | 912 | log("Warning: Remote host failed or refused to allocate a pseudo tty."); |
913 | else | |
914 | packet_disconnect("Protocol error waiting for pty request response."); | |
915 | } | |
916 | /* Request X11 forwarding if enabled and DISPLAY is set. */ | |
917 | if (options.forward_x11 && getenv("DISPLAY") != NULL) { | |
b48eeb07 | 918 | char *proto, *data; |
0b242b12 | 919 | /* Get reasonable local authentication information. */ |
b48eeb07 | 920 | x11_get_proto(&proto, &data); |
0b242b12 | 921 | /* Request forwarding with authentication spoofing. */ |
5260325f | 922 | debug("Requesting X11 forwarding with authentication spoofing."); |
0b242b12 | 923 | x11_request_forwarding_with_spoofing(0, proto, data); |
5260325f | 924 | |
925 | /* Read response from the server. */ | |
54a5250f | 926 | type = packet_read(); |
5260325f | 927 | if (type == SSH_SMSG_SUCCESS) { |
5260325f | 928 | interactive = 1; |
0b242b12 | 929 | } else if (type == SSH_SMSG_FAILURE) { |
5260325f | 930 | log("Warning: Remote host denied X11 forwarding."); |
0b242b12 | 931 | } else { |
5260325f | 932 | packet_disconnect("Protocol error waiting for X11 forwarding"); |
0b242b12 | 933 | } |
5260325f | 934 | } |
935 | /* Tell the packet module whether this is an interactive session. */ | |
b5c334cc | 936 | packet_set_interactive(interactive); |
5260325f | 937 | |
938 | /* Request authentication agent forwarding if appropriate. */ | |
fa08c86b | 939 | check_agent_present(); |
940 | ||
5260325f | 941 | if (options.forward_agent) { |
942 | debug("Requesting authentication agent forwarding."); | |
943 | auth_request_forwarding(); | |
944 | ||
945 | /* Read response from the server. */ | |
54a5250f | 946 | type = packet_read(); |
95500969 | 947 | packet_check_eom(); |
5260325f | 948 | if (type != SSH_SMSG_SUCCESS) |
949 | log("Warning: Remote host denied authentication agent forwarding."); | |
950 | } | |
8efc0c15 | 951 | |
fa08c86b | 952 | /* Initiate port forwardings. */ |
953 | ssh_init_forwarding(); | |
5260325f | 954 | |
aa3378df | 955 | /* If requested, let ssh continue in the background. */ |
6ae2364d | 956 | if (fork_after_authentication_flag) |
aa3378df | 957 | if (daemon(1, 1) < 0) |
958 | fatal("daemon() failed: %.200s", strerror(errno)); | |
959 | ||
960 | /* | |
961 | * If a command was specified on the command line, execute the | |
962 | * command now. Otherwise request the server to start a shell. | |
963 | */ | |
5260325f | 964 | if (buffer_len(&command) > 0) { |
965 | int len = buffer_len(&command); | |
966 | if (len > 900) | |
967 | len = 900; | |
6c0fa2b1 | 968 | debug("Sending command: %.*s", len, (u_char *)buffer_ptr(&command)); |
5260325f | 969 | packet_start(SSH_CMSG_EXEC_CMD); |
970 | packet_put_string(buffer_ptr(&command), buffer_len(&command)); | |
971 | packet_send(); | |
972 | packet_write_wait(); | |
973 | } else { | |
974 | debug("Requesting shell."); | |
975 | packet_start(SSH_CMSG_EXEC_SHELL); | |
976 | packet_send(); | |
977 | packet_write_wait(); | |
978 | } | |
979 | ||
980 | /* Enter the interactive session. */ | |
4bf9c10e | 981 | return client_loop(have_tty, tty_flag ? |
982 | options.escape_char : SSH_ESCAPECHAR_NONE, 0); | |
8ce64345 | 983 | } |
5260325f | 984 | |
396c147e | 985 | static void |
7819b5c3 | 986 | client_subsystem_reply(int type, u_int32_t seq, void *ctxt) |
1f3bf5aa | 987 | { |
988 | int id, len; | |
989 | ||
990 | id = packet_get_int(); | |
991 | len = buffer_len(&command); | |
ce91d6f8 | 992 | if (len > 900) |
993 | len = 900; | |
95500969 | 994 | packet_check_eom(); |
1f3bf5aa | 995 | if (type == SSH2_MSG_CHANNEL_FAILURE) |
996 | fatal("Request for subsystem '%.*s' failed on channel %d", | |
6c0fa2b1 | 997 | len, (u_char *)buffer_ptr(&command), id); |
1f3bf5aa | 998 | } |
999 | ||
e0ae8728 | 1000 | void |
1001 | client_global_request_reply(int type, u_int32_t seq, void *ctxt) | |
1002 | { | |
1003 | int i; | |
1004 | ||
1005 | i = client_global_request_id++; | |
1006 | if (i >= options.num_remote_forwards) { | |
1007 | debug("client_global_request_reply: too many replies %d > %d", | |
1008 | i, options.num_remote_forwards); | |
1009 | return; | |
1010 | } | |
1011 | debug("remote forward %s for: listen %d, connect %s:%d", | |
1012 | type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure", | |
1013 | options.remote_forwards[i].port, | |
1014 | options.remote_forwards[i].host, | |
1015 | options.remote_forwards[i].host_port); | |
1016 | if (type == SSH2_MSG_REQUEST_FAILURE) | |
1017 | log("Warning: remote port forwarding failed for listen port %d", | |
1018 | options.remote_forwards[i].port); | |
1019 | } | |
1020 | ||
bcdb96c2 | 1021 | /* request pty/x11/agent/tcpfwd/shell for channel */ |
396c147e | 1022 | static void |
bcdb96c2 | 1023 | ssh_session2_setup(int id, void *arg) |
8ce64345 | 1024 | { |
1025 | int len; | |
b5c334cc | 1026 | int interactive = 0; |
30dcc918 | 1027 | struct termios tio; |
b5c334cc | 1028 | |
bcdb96c2 | 1029 | debug("ssh_session2_setup: id %d", id); |
8ce64345 | 1030 | |
8ce64345 | 1031 | if (tty_flag) { |
1032 | struct winsize ws; | |
1033 | char *cp; | |
1034 | cp = getenv("TERM"); | |
1035 | if (!cp) | |
1036 | cp = ""; | |
1037 | /* Store window size in the packet. */ | |
1038 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) | |
1039 | memset(&ws, 0, sizeof(ws)); | |
1040 | ||
1041 | channel_request_start(id, "pty-req", 0); | |
1042 | packet_put_cstring(cp); | |
1043 | packet_put_int(ws.ws_col); | |
1044 | packet_put_int(ws.ws_row); | |
1045 | packet_put_int(ws.ws_xpixel); | |
1046 | packet_put_int(ws.ws_ypixel); | |
30dcc918 | 1047 | tio = get_saved_tio(); |
1048 | tty_make_modes(/*ignored*/ 0, &tio); | |
8ce64345 | 1049 | packet_send(); |
b5c334cc | 1050 | interactive = 1; |
8ce64345 | 1051 | /* XXX wait for reply */ |
1052 | } | |
0b242b12 | 1053 | if (options.forward_x11 && |
1054 | getenv("DISPLAY") != NULL) { | |
b48eeb07 | 1055 | char *proto, *data; |
0b242b12 | 1056 | /* Get reasonable local authentication information. */ |
b48eeb07 | 1057 | x11_get_proto(&proto, &data); |
0b242b12 | 1058 | /* Request forwarding with authentication spoofing. */ |
1059 | debug("Requesting X11 forwarding with authentication spoofing."); | |
1060 | x11_request_forwarding_with_spoofing(id, proto, data); | |
b5c334cc | 1061 | interactive = 1; |
0b242b12 | 1062 | /* XXX wait for reply */ |
1063 | } | |
1064 | ||
fa08c86b | 1065 | check_agent_present(); |
1066 | if (options.forward_agent) { | |
1067 | debug("Requesting authentication agent forwarding."); | |
1068 | channel_request_start(id, "auth-agent-req@openssh.com", 0); | |
1069 | packet_send(); | |
1070 | } | |
1071 | ||
8ce64345 | 1072 | len = buffer_len(&command); |
1073 | if (len > 0) { | |
1074 | if (len > 900) | |
1075 | len = 900; | |
ae810de7 | 1076 | if (subsystem_flag) { |
6c0fa2b1 | 1077 | debug("Sending subsystem: %.*s", len, (u_char *)buffer_ptr(&command)); |
1f3bf5aa | 1078 | channel_request_start(id, "subsystem", /*want reply*/ 1); |
1079 | /* register callback for reply */ | |
c242fc96 | 1080 | /* XXX we assume that client_loop has already been called */ |
1f3bf5aa | 1081 | dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &client_subsystem_reply); |
1082 | dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &client_subsystem_reply); | |
ae810de7 | 1083 | } else { |
6c0fa2b1 | 1084 | debug("Sending command: %.*s", len, (u_char *)buffer_ptr(&command)); |
ae810de7 | 1085 | channel_request_start(id, "exec", 0); |
1086 | } | |
ce91d6f8 | 1087 | packet_put_string(buffer_ptr(&command), buffer_len(&command)); |
8ce64345 | 1088 | packet_send(); |
1089 | } else { | |
06ee33fb | 1090 | channel_request_start(id, "shell", 0); |
1091 | packet_send(); | |
8ce64345 | 1092 | } |
1f3bf5aa | 1093 | |
b5c334cc | 1094 | packet_set_interactive(interactive); |
8ce64345 | 1095 | } |
1096 | ||
bcdb96c2 | 1097 | /* open new channel for a session */ |
396c147e | 1098 | static int |
bcdb96c2 | 1099 | ssh_session2_open(void) |
8ce64345 | 1100 | { |
719fc62f | 1101 | Channel *c; |
1102 | int window, packetmax, in, out, err; | |
2e73a022 | 1103 | |
14a9a859 | 1104 | if (stdin_null_flag) { |
5ca51e19 | 1105 | in = open(_PATH_DEVNULL, O_RDONLY); |
14a9a859 | 1106 | } else { |
1107 | in = dup(STDIN_FILENO); | |
1108 | } | |
2e73a022 | 1109 | out = dup(STDOUT_FILENO); |
1110 | err = dup(STDERR_FILENO); | |
8ce64345 | 1111 | |
1112 | if (in < 0 || out < 0 || err < 0) | |
14a9a859 | 1113 | fatal("dup() in/out/err failed"); |
8ce64345 | 1114 | |
a22aff1f | 1115 | /* enable nonblocking unless tty */ |
1116 | if (!isatty(in)) | |
1117 | set_nonblock(in); | |
1118 | if (!isatty(out)) | |
1119 | set_nonblock(out); | |
1120 | if (!isatty(err)) | |
1121 | set_nonblock(err); | |
1122 | ||
bcbf86ec | 1123 | window = CHAN_SES_WINDOW_DEFAULT; |
1124 | packetmax = CHAN_SES_PACKET_DEFAULT; | |
ea9700ba | 1125 | if (tty_flag) { |
1126 | window >>= 1; | |
1127 | packetmax >>= 1; | |
8ce64345 | 1128 | } |
719fc62f | 1129 | c = channel_new( |
8ce64345 | 1130 | "session", SSH_CHANNEL_OPENING, in, out, err, |
bcbf86ec | 1131 | window, packetmax, CHAN_EXTENDED_WRITE, |
a22aff1f | 1132 | xstrdup("client-session"), /*nonblock*/0); |
8ce64345 | 1133 | |
bcdb96c2 | 1134 | debug3("ssh_session2_open: channel_new: %d", c->self); |
eb0dd41f | 1135 | |
36e1f6a1 | 1136 | channel_send_open(c->self); |
bcdb96c2 | 1137 | if (!no_shell_flag) |
05ca0898 | 1138 | channel_register_confirm(c->self, ssh_session2_setup); |
5260325f | 1139 | |
719fc62f | 1140 | return c->self; |
eb0dd41f | 1141 | } |
1142 | ||
396c147e | 1143 | static int |
eb0dd41f | 1144 | ssh_session2(void) |
1145 | { | |
bcdb96c2 | 1146 | int id = -1; |
eb0dd41f | 1147 | |
1148 | /* XXX should be pre-session */ | |
1149 | ssh_init_forwarding(); | |
1150 | ||
bcdb96c2 | 1151 | if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN)) |
1152 | id = ssh_session2_open(); | |
eb0dd41f | 1153 | |
1154 | /* If requested, let ssh continue in the background. */ | |
1155 | if (fork_after_authentication_flag) | |
1156 | if (daemon(1, 1) < 0) | |
1157 | fatal("daemon() failed: %.200s", strerror(errno)); | |
1158 | ||
4bf9c10e | 1159 | return client_loop(tty_flag, tty_flag ? |
1160 | options.escape_char : SSH_ESCAPECHAR_NONE, id); | |
8efc0c15 | 1161 | } |
fa08c86b | 1162 | |
396c147e | 1163 | static void |
fee56204 | 1164 | load_public_identity_files(void) |
1165 | { | |
1166 | char *filename; | |
2e23cde0 | 1167 | int i = 0; |
0659cace | 1168 | Key *public; |
383546c4 | 1169 | #ifdef SMARTCARD |
0659cace | 1170 | Key **keys; |
1171 | ||
9ff6f66f | 1172 | if (options.smartcard_device != NULL && |
0659cace | 1173 | options.num_identity_files < SSH_MAX_IDENTITY_FILES && |
1174 | (keys = sc_get_keys(options.smartcard_device, NULL)) != NULL ) { | |
1175 | int count = 0; | |
1176 | for (i = 0; keys[i] != NULL; i++) { | |
1177 | count++; | |
0659cace | 1178 | memmove(&options.identity_files[1], &options.identity_files[0], |
1179 | sizeof(char *) * (SSH_MAX_IDENTITY_FILES - 1)); | |
1180 | memmove(&options.identity_keys[1], &options.identity_keys[0], | |
1181 | sizeof(Key *) * (SSH_MAX_IDENTITY_FILES - 1)); | |
1182 | options.num_identity_files++; | |
1183 | options.identity_keys[0] = keys[i]; | |
1184 | options.identity_files[0] = xstrdup("smartcard key");; | |
1185 | } | |
1c2deed1 | 1186 | if (options.num_identity_files > SSH_MAX_IDENTITY_FILES) |
1187 | options.num_identity_files = SSH_MAX_IDENTITY_FILES; | |
0659cace | 1188 | i = count; |
1189 | xfree(keys); | |
383546c4 | 1190 | } |
3e984472 | 1191 | #endif /* SMARTCARD */ |
2e23cde0 | 1192 | for (; i < options.num_identity_files; i++) { |
1193 | filename = tilde_expand_filename(options.identity_files[i], | |
1194 | original_real_uid); | |
1195 | public = key_load_public(filename, NULL); | |
1196 | debug("identity file %s type %d", filename, | |
1197 | public ? public->type : -1); | |
1198 | xfree(options.identity_files[i]); | |
1199 | options.identity_files[i] = filename; | |
1200 | options.identity_keys[i] = public; | |
1201 | } | |
fee56204 | 1202 | } |