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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. | |
16 | * | |
17 | * Modified to work with SSL by Niels Provos <provos@citi.umich.edu> | |
18 | * in Canada (German citizen). | |
19 | * | |
20 | * Redistribution and use in source and binary forms, with or without | |
21 | * modification, are permitted provided that the following conditions | |
22 | * are met: | |
23 | * 1. Redistributions of source code must retain the above copyright | |
24 | * notice, this list of conditions and the following disclaimer. | |
25 | * 2. Redistributions in binary form must reproduce the above copyright | |
26 | * notice, this list of conditions and the following disclaimer in the | |
27 | * documentation and/or other materials provided with the distribution. | |
28 | * | |
29 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
30 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
31 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
32 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
33 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
34 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
35 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
36 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
37 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
38 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
5260325f | 39 | */ |
8efc0c15 | 40 | |
41 | #include "includes.h" | |
3b1a83df | 42 | RCSID("$OpenBSD: ssh.c,v 1.98 2001/02/22 21:59:44 markus Exp $"); |
8efc0c15 | 43 | |
a306f2dd | 44 | #include <openssl/evp.h> |
fa08c86b | 45 | #include <openssl/err.h> |
a306f2dd | 46 | |
8efc0c15 | 47 | #include "ssh.h" |
42f11eb2 | 48 | #include "ssh1.h" |
49 | #include "ssh2.h" | |
50 | #include "compat.h" | |
51 | #include "cipher.h" | |
52 | #include "xmalloc.h" | |
8efc0c15 | 53 | #include "packet.h" |
54 | #include "buffer.h" | |
8efc0c15 | 55 | #include "uidswap.h" |
7368a6c8 | 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" | |
8efc0c15 | 70 | |
f601d847 | 71 | #ifdef HAVE___PROGNAME |
72 | extern char *__progname; | |
260d427b | 73 | #else |
74 | char *__progname; | |
75 | #endif | |
f601d847 | 76 | |
48e671d5 | 77 | /* Flag indicating whether IPv4 or IPv6. This can be set on the command line. |
78 | Default value is AF_UNSPEC means both IPv4 and IPv6. */ | |
59e76f33 | 79 | #ifdef IPV4_DEFAULT |
80 | int IPv4or6 = AF_INET; | |
81 | #else | |
48e671d5 | 82 | int IPv4or6 = AF_UNSPEC; |
59e76f33 | 83 | #endif |
48e671d5 | 84 | |
5260325f | 85 | /* Flag indicating whether debug mode is on. This can be set on the command line. */ |
8efc0c15 | 86 | int debug_flag = 0; |
87 | ||
a8be9f80 | 88 | /* Flag indicating whether a tty should be allocated */ |
8efc0c15 | 89 | int tty_flag = 0; |
8abcdba4 | 90 | int no_tty_flag = 0; |
91 | int force_tty_flag = 0; | |
8efc0c15 | 92 | |
8ce64345 | 93 | /* don't exec a shell */ |
94 | int no_shell_flag = 0; | |
8ce64345 | 95 | |
aa3378df | 96 | /* |
97 | * Flag indicating that nothing should be read from stdin. This can be set | |
98 | * on the command line. | |
99 | */ | |
8efc0c15 | 100 | int stdin_null_flag = 0; |
101 | ||
aa3378df | 102 | /* |
103 | * Flag indicating that ssh should fork after authentication. This is useful | |
104 | * so that the pasphrase can be entered manually, and then ssh goes to the | |
105 | * background. | |
106 | */ | |
8efc0c15 | 107 | int fork_after_authentication_flag = 0; |
108 | ||
aa3378df | 109 | /* |
110 | * General data structure for command line options and options configurable | |
111 | * in configuration files. See readconf.h. | |
112 | */ | |
8efc0c15 | 113 | Options options; |
114 | ||
aa3378df | 115 | /* |
116 | * Name of the host we are connecting to. This is the name given on the | |
117 | * command line, or the HostName specified for the user-supplied name in a | |
118 | * configuration file. | |
119 | */ | |
8efc0c15 | 120 | char *host; |
121 | ||
122 | /* socket address the host resolves to */ | |
48e671d5 | 123 | struct sockaddr_storage hostaddr; |
8efc0c15 | 124 | |
aa3378df | 125 | /* |
126 | * Flag to indicate that we have received a window change signal which has | |
127 | * not yet been processed. This will cause a message indicating the new | |
128 | * window size to be sent to the server a little later. This is volatile | |
129 | * because this is updated in a signal handler. | |
130 | */ | |
8efc0c15 | 131 | volatile int received_window_change_signal = 0; |
132 | ||
8efc0c15 | 133 | /* Flag indicating whether we have a valid host private key loaded. */ |
134 | int host_private_key_loaded = 0; | |
135 | ||
136 | /* Host private key. */ | |
137 | RSA *host_private_key = NULL; | |
138 | ||
139 | /* Original real UID. */ | |
140 | uid_t original_real_uid; | |
141 | ||
8ce64345 | 142 | /* command to be executed */ |
143 | Buffer command; | |
144 | ||
ae810de7 | 145 | /* Should we execute a command or invoke a subsystem? */ |
146 | int subsystem_flag = 0; | |
147 | ||
8efc0c15 | 148 | /* Prints a help message to the user. This function never returns. */ |
149 | ||
150 | 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"); |
71276795 | 157 | fprintf(stderr, " -A Enable authentication agent forwarding.\n"); |
5260325f | 158 | fprintf(stderr, " -a Disable authentication agent forwarding.\n"); |
8efc0c15 | 159 | #ifdef AFS |
5260325f | 160 | fprintf(stderr, " -k Disable Kerberos ticket and AFS token forwarding.\n"); |
161 | #endif /* AFS */ | |
2b87da3b | 162 | fprintf(stderr, " -X Enable X11 connection forwarding.\n"); |
5260325f | 163 | fprintf(stderr, " -x Disable X11 connection forwarding.\n"); |
96ee8386 | 164 | fprintf(stderr, " -i file Identity for public key authentication\n"); |
165 | fprintf(stderr, " (default: ~/.ssh/identity).\n"); | |
5260325f | 166 | fprintf(stderr, " -t Tty; allocate a tty even if command is given.\n"); |
8ce64345 | 167 | fprintf(stderr, " -T Do not allocate a tty.\n"); |
5260325f | 168 | fprintf(stderr, " -v Verbose; display verbose debugging messages.\n"); |
bcbf86ec | 169 | fprintf(stderr, " Multiple -v increases verbosity.\n"); |
5260325f | 170 | fprintf(stderr, " -V Display version number only.\n"); |
171 | fprintf(stderr, " -P Don't allocate a privileged port.\n"); | |
172 | fprintf(stderr, " -q Quiet; don't display any warning messages.\n"); | |
173 | fprintf(stderr, " -f Fork into background after authentication.\n"); | |
174 | fprintf(stderr, " -e char Set escape character; ``none'' = disable (default: ~).\n"); | |
175 | ||
176 | fprintf(stderr, " -c cipher Select encryption algorithm: " | |
177 | "``3des'', " | |
178 | "``blowfish''\n"); | |
179 | fprintf(stderr, " -p port Connect to this port. Server must be on the same port.\n"); | |
180 | fprintf(stderr, " -L listen-port:host:port Forward local port to remote address\n"); | |
181 | fprintf(stderr, " -R listen-port:host:port Forward remote port to local address\n"); | |
1fe6a48f | 182 | fprintf(stderr, " These cause %s to listen for connections on a port, and\n", __progname); |
5260325f | 183 | fprintf(stderr, " forward them to the other side by connecting to host:port.\n"); |
184 | fprintf(stderr, " -C Enable compression.\n"); | |
8ce64345 | 185 | fprintf(stderr, " -N Do not execute a shell or command.\n"); |
5260325f | 186 | fprintf(stderr, " -g Allow remote hosts to connect to forwarded ports.\n"); |
1f3bf5aa | 187 | fprintf(stderr, " -1 Force protocol version 1.\n"); |
188 | fprintf(stderr, " -2 Force protocol version 2.\n"); | |
48e671d5 | 189 | fprintf(stderr, " -4 Use IPv4 only.\n"); |
190 | fprintf(stderr, " -6 Use IPv6 only.\n"); | |
5260325f | 191 | fprintf(stderr, " -o 'option' Process the option as if it was read from a configuration file.\n"); |
ae810de7 | 192 | fprintf(stderr, " -s Invoke command (mandatory) as SSH2 subsystem.\n"); |
5260325f | 193 | exit(1); |
8efc0c15 | 194 | } |
195 | ||
5260325f | 196 | /* |
197 | * Connects to the given host using rsh (or prints an error message and exits | |
198 | * if rsh is not available). This function never returns. | |
199 | */ | |
8efc0c15 | 200 | void |
5260325f | 201 | rsh_connect(char *host, char *user, Buffer * command) |
8efc0c15 | 202 | { |
5260325f | 203 | char *args[10]; |
204 | int i; | |
205 | ||
206 | log("Using rsh. WARNING: Connection will not be encrypted."); | |
207 | /* Build argument list for rsh. */ | |
208 | i = 0; | |
209 | args[i++] = _PATH_RSH; | |
210 | /* host may have to come after user on some systems */ | |
211 | args[i++] = host; | |
212 | if (user) { | |
213 | args[i++] = "-l"; | |
214 | args[i++] = user; | |
215 | } | |
216 | if (buffer_len(command) > 0) { | |
217 | buffer_append(command, "\0", 1); | |
218 | args[i++] = buffer_ptr(command); | |
219 | } | |
220 | args[i++] = NULL; | |
221 | if (debug_flag) { | |
222 | for (i = 0; args[i]; i++) { | |
223 | if (i != 0) | |
224 | fprintf(stderr, " "); | |
225 | fprintf(stderr, "%s", args[i]); | |
226 | } | |
227 | fprintf(stderr, "\n"); | |
8efc0c15 | 228 | } |
5260325f | 229 | execv(_PATH_RSH, args); |
230 | perror(_PATH_RSH); | |
231 | exit(1); | |
8efc0c15 | 232 | } |
233 | ||
fa08c86b | 234 | int ssh_session(void); |
235 | int ssh_session2(void); | |
236 | int guess_identity_file_type(const char *filename); | |
8ce64345 | 237 | |
5260325f | 238 | /* |
239 | * Main program for the ssh client. | |
240 | */ | |
8efc0c15 | 241 | int |
242 | main(int ac, char **av) | |
243 | { | |
8ce64345 | 244 | int i, opt, optind, exit_status, ok; |
57112b5a | 245 | u_short fwd_port, fwd_host_port; |
5260325f | 246 | char *optarg, *cp, buf[256]; |
5260325f | 247 | struct stat st; |
3b1a83df | 248 | struct passwd *pw; |
8ce64345 | 249 | int dummy; |
5260325f | 250 | uid_t original_effective_uid; |
5260325f | 251 | |
260d427b | 252 | __progname = get_progname(av[0]); |
264dce47 | 253 | init_rng(); |
254 | ||
aa3378df | 255 | /* |
256 | * Save the original real uid. It will be needed later (uid-swapping | |
257 | * may clobber the real uid). | |
258 | */ | |
5260325f | 259 | original_real_uid = getuid(); |
260 | original_effective_uid = geteuid(); | |
261 | ||
7322ef0e | 262 | #ifdef HAVE_SETRLIMIT |
5260325f | 263 | /* If we are installed setuid root be careful to not drop core. */ |
264 | if (original_real_uid != original_effective_uid) { | |
265 | struct rlimit rlim; | |
266 | rlim.rlim_cur = rlim.rlim_max = 0; | |
267 | if (setrlimit(RLIMIT_CORE, &rlim) < 0) | |
268 | fatal("setrlimit failed: %.100s", strerror(errno)); | |
8efc0c15 | 269 | } |
3c62e7eb | 270 | #endif |
aa3378df | 271 | /* |
272 | * Use uid-swapping to give up root privileges for the duration of | |
273 | * option processing. We will re-instantiate the rights when we are | |
274 | * ready to create the privileged port, and will permanently drop | |
275 | * them when the port has been created (actually, when the connection | |
276 | * has been made, as we may need to create the port several times). | |
277 | */ | |
5260325f | 278 | temporarily_use_uid(original_real_uid); |
279 | ||
aa3378df | 280 | /* |
281 | * Set our umask to something reasonable, as some files are created | |
282 | * with the default umask. This will make them world-readable but | |
283 | * writable only by the owner, which is ok for all files for which we | |
284 | * don't set the modes explicitly. | |
285 | */ | |
5260325f | 286 | umask(022); |
287 | ||
5260325f | 288 | /* Initialize option structure to indicate that no values have been set. */ |
289 | initialize_options(&options); | |
290 | ||
291 | /* Parse command-line arguments. */ | |
292 | host = NULL; | |
293 | ||
5260325f | 294 | for (optind = 1; optind < ac; optind++) { |
295 | if (av[optind][0] != '-') { | |
296 | if (host) | |
297 | break; | |
298 | if ((cp = strchr(av[optind], '@'))) { | |
6ae2364d | 299 | if(cp == av[optind]) |
300 | usage(); | |
5260325f | 301 | options.user = av[optind]; |
302 | *cp = '\0'; | |
303 | host = ++cp; | |
304 | } else | |
305 | host = av[optind]; | |
306 | continue; | |
307 | } | |
308 | opt = av[optind][1]; | |
309 | if (!opt) | |
310 | usage(); | |
b2552997 | 311 | if (strchr("eilcmpLRo", opt)) { /* options with arguments */ |
5260325f | 312 | optarg = av[optind] + 2; |
313 | if (strcmp(optarg, "") == 0) { | |
314 | if (optind >= ac - 1) | |
315 | usage(); | |
316 | optarg = av[++optind]; | |
317 | } | |
318 | } else { | |
319 | if (av[optind][2]) | |
320 | usage(); | |
321 | optarg = NULL; | |
322 | } | |
323 | switch (opt) { | |
1f3bf5aa | 324 | case '1': |
325 | options.protocol = SSH_PROTO_1; | |
326 | break; | |
6ae2364d | 327 | case '2': |
328 | options.protocol = SSH_PROTO_2; | |
329 | break; | |
48e671d5 | 330 | case '4': |
331 | IPv4or6 = AF_INET; | |
332 | break; | |
48e671d5 | 333 | case '6': |
334 | IPv4or6 = AF_INET6; | |
335 | break; | |
5260325f | 336 | case 'n': |
337 | stdin_null_flag = 1; | |
338 | break; | |
5260325f | 339 | case 'f': |
340 | fork_after_authentication_flag = 1; | |
341 | stdin_null_flag = 1; | |
342 | break; | |
5260325f | 343 | case 'x': |
344 | options.forward_x11 = 0; | |
345 | break; | |
5260325f | 346 | case 'X': |
347 | options.forward_x11 = 1; | |
348 | break; | |
5260325f | 349 | case 'g': |
350 | options.gateway_ports = 1; | |
351 | break; | |
5260325f | 352 | case 'P': |
353 | options.use_privileged_port = 0; | |
354 | break; | |
5260325f | 355 | case 'a': |
356 | options.forward_agent = 0; | |
357 | break; | |
71276795 | 358 | case 'A': |
359 | options.forward_agent = 1; | |
360 | break; | |
5260325f | 361 | #ifdef AFS |
362 | case 'k': | |
363 | options.kerberos_tgt_passing = 0; | |
364 | options.afs_token_passing = 0; | |
365 | break; | |
366 | #endif | |
367 | case 'i': | |
368 | if (stat(optarg, &st) < 0) { | |
369 | fprintf(stderr, "Warning: Identity file %s does not exist.\n", | |
fa08c86b | 370 | optarg); |
5260325f | 371 | break; |
372 | } | |
373 | if (options.num_identity_files >= SSH_MAX_IDENTITY_FILES) | |
374 | fatal("Too many identity files specified (max %d)", | |
fa08c86b | 375 | SSH_MAX_IDENTITY_FILES); |
376 | options.identity_files[options.num_identity_files++] = xstrdup(optarg); | |
5260325f | 377 | break; |
5260325f | 378 | case 't': |
8abcdba4 | 379 | if (tty_flag) |
380 | force_tty_flag = 1; | |
5260325f | 381 | tty_flag = 1; |
382 | break; | |
5260325f | 383 | case 'v': |
bcbf86ec | 384 | if (0 == debug_flag) { |
385 | debug_flag = 1; | |
386 | options.log_level = SYSLOG_LEVEL_DEBUG1; | |
387 | } else if (options.log_level < SYSLOG_LEVEL_DEBUG3) { | |
388 | options.log_level++; | |
389 | break; | |
390 | } else { | |
391 | fatal("Too high debugging level.\n"); | |
392 | } | |
393 | /* fallthrough */ | |
5260325f | 394 | case 'V': |
e68225b2 | 395 | fprintf(stderr, |
396 | "%s, SSH protocols %d.%d/%d.%d, OpenSSL 0x%8.8lx\n", | |
a8be9f80 | 397 | SSH_VERSION, |
398 | PROTOCOL_MAJOR_1, PROTOCOL_MINOR_1, | |
e68225b2 | 399 | PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2, |
400 | SSLeay()); | |
5260325f | 401 | if (opt == 'V') |
402 | exit(0); | |
5260325f | 403 | break; |
5260325f | 404 | case 'q': |
405 | options.log_level = SYSLOG_LEVEL_QUIET; | |
406 | break; | |
5260325f | 407 | case 'e': |
408 | if (optarg[0] == '^' && optarg[2] == 0 && | |
1e3b8b07 | 409 | (u_char) optarg[1] >= 64 && (u_char) optarg[1] < 128) |
410 | options.escape_char = (u_char) optarg[1] & 31; | |
5260325f | 411 | else if (strlen(optarg) == 1) |
1e3b8b07 | 412 | options.escape_char = (u_char) optarg[0]; |
5260325f | 413 | else if (strcmp(optarg, "none") == 0) |
414 | options.escape_char = -2; | |
415 | else { | |
416 | fprintf(stderr, "Bad escape character '%s'.\n", optarg); | |
417 | exit(1); | |
418 | } | |
419 | break; | |
5260325f | 420 | case 'c': |
a306f2dd | 421 | if (ciphers_valid(optarg)) { |
422 | /* SSH2 only */ | |
423 | options.ciphers = xstrdup(optarg); | |
d0c832f3 | 424 | options.cipher = SSH_CIPHER_ILLEGAL; |
a306f2dd | 425 | } else { |
426 | /* SSH1 only */ | |
c523303b | 427 | options.cipher = cipher_number(optarg); |
428 | if (options.cipher == -1) { | |
a306f2dd | 429 | fprintf(stderr, "Unknown cipher type '%s'\n", optarg); |
430 | exit(1); | |
431 | } | |
c523303b | 432 | if (options.cipher == SSH_CIPHER_3DES) { |
433 | options.ciphers = "3des-cbc"; | |
434 | } else if (options.cipher == SSH_CIPHER_BLOWFISH) { | |
435 | options.ciphers = "blowfish-cbc"; | |
436 | } else { | |
437 | options.ciphers = (char *)-1; | |
438 | } | |
5260325f | 439 | } |
440 | break; | |
b2552997 | 441 | case 'm': |
442 | if (mac_valid(optarg)) | |
443 | options.macs = xstrdup(optarg); | |
444 | else { | |
445 | fprintf(stderr, "Unknown mac type '%s'\n", optarg); | |
446 | exit(1); | |
447 | } | |
448 | break; | |
5260325f | 449 | case 'p': |
450 | options.port = atoi(optarg); | |
5260325f | 451 | break; |
5260325f | 452 | case 'l': |
453 | options.user = optarg; | |
454 | break; | |
5260325f | 455 | case 'R': |
48e671d5 | 456 | if (sscanf(optarg, "%hu/%255[^/]/%hu", &fwd_port, buf, |
457 | &fwd_host_port) != 3 && | |
458 | sscanf(optarg, "%hu:%255[^:]:%hu", &fwd_port, buf, | |
459 | &fwd_host_port) != 3) { | |
5260325f | 460 | fprintf(stderr, "Bad forwarding specification '%s'.\n", optarg); |
461 | usage(); | |
462 | /* NOTREACHED */ | |
463 | } | |
464 | add_remote_forward(&options, fwd_port, buf, fwd_host_port); | |
465 | break; | |
5260325f | 466 | case 'L': |
48e671d5 | 467 | if (sscanf(optarg, "%hu/%255[^/]/%hu", &fwd_port, buf, |
468 | &fwd_host_port) != 3 && | |
469 | sscanf(optarg, "%hu:%255[^:]:%hu", &fwd_port, buf, | |
470 | &fwd_host_port) != 3) { | |
5260325f | 471 | fprintf(stderr, "Bad forwarding specification '%s'.\n", optarg); |
472 | usage(); | |
473 | /* NOTREACHED */ | |
474 | } | |
475 | add_local_forward(&options, fwd_port, buf, fwd_host_port); | |
476 | break; | |
5260325f | 477 | case 'C': |
478 | options.compression = 1; | |
479 | break; | |
8ce64345 | 480 | case 'N': |
481 | no_shell_flag = 1; | |
482 | no_tty_flag = 1; | |
483 | break; | |
8ce64345 | 484 | case 'T': |
485 | no_tty_flag = 1; | |
486 | break; | |
5260325f | 487 | case 'o': |
488 | dummy = 1; | |
489 | if (process_config_line(&options, host ? host : "", optarg, | |
490 | "command-line", 0, &dummy) != 0) | |
491 | exit(1); | |
492 | break; | |
ae810de7 | 493 | case 's': |
494 | subsystem_flag = 1; | |
495 | break; | |
5260325f | 496 | default: |
497 | usage(); | |
498 | } | |
499 | } | |
500 | ||
501 | /* Check that we got a host name. */ | |
502 | if (!host) | |
8efc0c15 | 503 | usage(); |
5260325f | 504 | |
22d89d24 | 505 | SSLeay_add_all_algorithms(); |
fa08c86b | 506 | ERR_load_crypto_strings(); |
22d89d24 | 507 | |
5260325f | 508 | /* Initialize the command to execute on remote host. */ |
509 | buffer_init(&command); | |
510 | ||
aa3378df | 511 | /* |
512 | * Save the command to execute on the remote host in a buffer. There | |
513 | * is no limit on the length of the command, except by the maximum | |
514 | * packet size. Also sets the tty flag if there is no command. | |
515 | */ | |
5260325f | 516 | if (optind == ac) { |
517 | /* No command specified - execute shell on a tty. */ | |
518 | tty_flag = 1; | |
ae810de7 | 519 | if (subsystem_flag) { |
520 | fprintf(stderr, "You must specify a subsystem to invoke."); | |
521 | usage(); | |
522 | } | |
5260325f | 523 | } else { |
524 | /* A command has been specified. Store it into the | |
525 | buffer. */ | |
526 | for (i = optind; i < ac; i++) { | |
527 | if (i > optind) | |
528 | buffer_append(&command, " ", 1); | |
529 | buffer_append(&command, av[i], strlen(av[i])); | |
530 | } | |
8efc0c15 | 531 | } |
5260325f | 532 | |
533 | /* Cannot fork to background if no command. */ | |
14a9a859 | 534 | if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag) |
5260325f | 535 | fatal("Cannot fork into background without a command to execute."); |
536 | ||
537 | /* Allocate a tty by default if no command specified. */ | |
538 | if (buffer_len(&command) == 0) | |
539 | tty_flag = 1; | |
540 | ||
0b6fbf03 | 541 | /* Force no tty*/ |
542 | if (no_tty_flag) | |
543 | tty_flag = 0; | |
5260325f | 544 | /* Do not allocate a tty if stdin is not a tty. */ |
8abcdba4 | 545 | if (!isatty(fileno(stdin)) && !force_tty_flag) { |
5260325f | 546 | if (tty_flag) |
b5c334cc | 547 | log("Pseudo-terminal will not be allocated because stdin is not a terminal.\n"); |
5260325f | 548 | tty_flag = 0; |
549 | } | |
8ce64345 | 550 | |
5260325f | 551 | /* Get user data. */ |
552 | pw = getpwuid(original_real_uid); | |
553 | if (!pw) { | |
b5c334cc | 554 | log("You don't exist, go away!\n"); |
5260325f | 555 | exit(1); |
556 | } | |
557 | /* Take a copy of the returned structure. */ | |
3b1a83df | 558 | pw = pwcopy(pw); |
5260325f | 559 | |
560 | /* Initialize "log" output. Since we are the client all output | |
561 | actually goes to the terminal. */ | |
562 | log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 0); | |
563 | ||
564 | /* Read per-user configuration file. */ | |
42f11eb2 | 565 | snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, _PATH_SSH_USER_CONFFILE); |
5260325f | 566 | read_config_file(buf, host, &options); |
567 | ||
568 | /* Read systemwide configuration file. */ | |
42f11eb2 | 569 | read_config_file(_PATH_HOST_CONFIG_FILE, host, &options); |
5260325f | 570 | |
571 | /* Fill configuration defaults. */ | |
572 | fill_default_options(&options); | |
573 | ||
574 | /* reinit */ | |
575 | log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 0); | |
576 | ||
577 | if (options.user == NULL) | |
578 | options.user = xstrdup(pw->pw_name); | |
579 | ||
580 | if (options.hostname != NULL) | |
581 | host = options.hostname; | |
582 | ||
5260325f | 583 | /* Disable rhosts authentication if not running as root. */ |
3c62e7eb | 584 | #ifdef HAVE_CYGWIN |
585 | /* Ignore uid if running under Windows */ | |
586 | if (!options.use_privileged_port) { | |
587 | #else | |
5260325f | 588 | if (original_effective_uid != 0 || !options.use_privileged_port) { |
3c62e7eb | 589 | #endif |
6ffc9c88 | 590 | debug("Rhosts Authentication disabled, " |
591 | "originating port will not be trusted."); | |
5260325f | 592 | options.rhosts_authentication = 0; |
5260325f | 593 | } |
aa3378df | 594 | /* |
595 | * If using rsh has been selected, exec it now (without trying | |
596 | * anything else). Note that we must release privileges first. | |
597 | */ | |
5260325f | 598 | if (options.use_rsh) { |
aa3378df | 599 | /* |
600 | * Restore our superuser privileges. This must be done | |
601 | * before permanently setting the uid. | |
602 | */ | |
5260325f | 603 | restore_uid(); |
604 | ||
605 | /* Switch to the original uid permanently. */ | |
606 | permanently_set_uid(original_real_uid); | |
607 | ||
608 | /* Execute rsh. */ | |
609 | rsh_connect(host, options.user, &command); | |
610 | fatal("rsh_connect returned"); | |
8efc0c15 | 611 | } |
5260325f | 612 | /* Restore our superuser privileges. */ |
613 | restore_uid(); | |
614 | ||
6ffc9c88 | 615 | /* Open a connection to the remote host. */ |
5260325f | 616 | |
617 | ok = ssh_connect(host, &hostaddr, options.port, | |
6ffc9c88 | 618 | options.connection_attempts, |
619 | original_effective_uid != 0 || !options.use_privileged_port, | |
620 | original_real_uid, | |
621 | options.proxy_command); | |
5260325f | 622 | |
aa3378df | 623 | /* |
624 | * If we successfully made the connection, load the host private key | |
625 | * in case we will need it later for combined rsa-rhosts | |
626 | * authentication. This must be done before releasing extra | |
627 | * privileges, because the file is only readable by root. | |
628 | */ | |
a306f2dd | 629 | if (ok && (options.protocol & SSH_PROTO_1)) { |
630 | Key k; | |
5260325f | 631 | host_private_key = RSA_new(); |
fa08c86b | 632 | k.type = KEY_RSA1; |
a306f2dd | 633 | k.rsa = host_private_key; |
42f11eb2 | 634 | if (load_private_key(_PATH_HOST_KEY_FILE, "", &k, NULL)) |
5260325f | 635 | host_private_key_loaded = 1; |
636 | } | |
aa3378df | 637 | /* |
638 | * Get rid of any extra privileges that we may have. We will no | |
639 | * longer need them. Also, extra privileges could make it very hard | |
640 | * to read identity files and other non-world-readable files from the | |
641 | * user's home directory if it happens to be on a NFS volume where | |
642 | * root is mapped to nobody. | |
643 | */ | |
644 | ||
645 | /* | |
646 | * Note that some legacy systems need to postpone the following call | |
647 | * to permanently_set_uid() until the private hostkey is destroyed | |
648 | * with RSA_free(). Otherwise the calling user could ptrace() the | |
649 | * process, read the private hostkey and impersonate the host. | |
650 | * OpenBSD does not allow ptracing of setuid processes. | |
651 | */ | |
5260325f | 652 | permanently_set_uid(original_real_uid); |
653 | ||
aa3378df | 654 | /* |
655 | * Now that we are back to our own permissions, create ~/.ssh | |
656 | * directory if it doesn\'t already exist. | |
657 | */ | |
42f11eb2 | 658 | snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, _PATH_SSH_USER_DIR); |
5260325f | 659 | if (stat(buf, &st) < 0) |
704b1659 | 660 | if (mkdir(buf, 0700) < 0) |
5260325f | 661 | error("Could not create directory '%.200s'.", buf); |
662 | ||
663 | /* Check if the connection failed, and try "rsh" if appropriate. */ | |
664 | if (!ok) { | |
665 | if (options.port != 0) | |
57112b5a | 666 | log("Secure connection to %.100s on port %hu refused%.100s.", |
5260325f | 667 | host, options.port, |
668 | options.fallback_to_rsh ? "; reverting to insecure method" : ""); | |
669 | else | |
670 | log("Secure connection to %.100s refused%.100s.", host, | |
671 | options.fallback_to_rsh ? "; reverting to insecure method" : ""); | |
672 | ||
673 | if (options.fallback_to_rsh) { | |
674 | rsh_connect(host, options.user, &command); | |
675 | fatal("rsh_connect returned"); | |
676 | } | |
677 | exit(1); | |
8efc0c15 | 678 | } |
fa08c86b | 679 | /* Expand ~ in options.identity_files, known host file names. */ |
a306f2dd | 680 | /* XXX mem-leaks */ |
fa08c86b | 681 | for (i = 0; i < options.num_identity_files; i++) { |
5260325f | 682 | options.identity_files[i] = |
fa08c86b | 683 | tilde_expand_filename(options.identity_files[i], original_real_uid); |
684 | options.identity_files_type[i] = guess_identity_file_type(options.identity_files[i]); | |
685 | debug("identity file %s type %d", options.identity_files[i], | |
686 | options.identity_files_type[i]); | |
687 | } | |
688 | options.system_hostfile = | |
689 | tilde_expand_filename(options.system_hostfile, original_real_uid); | |
690 | options.user_hostfile = | |
691 | tilde_expand_filename(options.user_hostfile, original_real_uid); | |
692 | options.system_hostfile2 = | |
693 | tilde_expand_filename(options.system_hostfile2, original_real_uid); | |
694 | options.user_hostfile2 = | |
695 | tilde_expand_filename(options.user_hostfile2, original_real_uid); | |
5260325f | 696 | |
697 | /* Log into the remote system. This never returns if the login fails. */ | |
698 | ssh_login(host_private_key_loaded, host_private_key, | |
48e671d5 | 699 | host, (struct sockaddr *)&hostaddr, original_real_uid); |
5260325f | 700 | |
701 | /* We no longer need the host private key. Clear it now. */ | |
702 | if (host_private_key_loaded) | |
703 | RSA_free(host_private_key); /* Destroys contents safely */ | |
704 | ||
8ce64345 | 705 | exit_status = compat20 ? ssh_session2() : ssh_session(); |
706 | packet_close(); | |
707 | return exit_status; | |
708 | } | |
709 | ||
0b242b12 | 710 | void |
711 | x11_get_proto(char *proto, int proto_len, char *data, int data_len) | |
712 | { | |
713 | char line[512]; | |
714 | FILE *f; | |
715 | int got_data = 0, i; | |
716 | ||
fa649821 | 717 | if (options.xauth_location) { |
718 | /* Try to get Xauthority information for the display. */ | |
5ca51e19 | 719 | snprintf(line, sizeof line, "%.100s list %.200s 2>" _PATH_DEVNULL, |
fa649821 | 720 | options.xauth_location, getenv("DISPLAY")); |
721 | f = popen(line, "r"); | |
722 | if (f && fgets(line, sizeof(line), f) && | |
723 | sscanf(line, "%*s %s %s", proto, data) == 2) | |
724 | got_data = 1; | |
725 | if (f) | |
726 | pclose(f); | |
727 | } | |
0b242b12 | 728 | /* |
729 | * If we didn't get authentication data, just make up some | |
730 | * data. The forwarding code will check the validity of the | |
731 | * response anyway, and substitute this data. The X11 | |
732 | * server, however, will ignore this fake data and use | |
733 | * whatever authentication mechanisms it was using otherwise | |
734 | * for the local connection. | |
735 | */ | |
736 | if (!got_data) { | |
737 | u_int32_t rand = 0; | |
738 | ||
739 | strlcpy(proto, "MIT-MAGIC-COOKIE-1", proto_len); | |
740 | for (i = 0; i < 16; i++) { | |
741 | if (i % 4 == 0) | |
742 | rand = arc4random(); | |
743 | snprintf(data + 2 * i, data_len - 2 * i, "%02x", rand & 0xff); | |
744 | rand >>= 8; | |
745 | } | |
746 | } | |
747 | } | |
748 | ||
fa08c86b | 749 | void |
750 | ssh_init_forwarding(void) | |
751 | { | |
02a024dd | 752 | int success = 0; |
fa08c86b | 753 | int i; |
02a024dd | 754 | |
fa08c86b | 755 | /* Initiate local TCP/IP port forwardings. */ |
756 | for (i = 0; i < options.num_local_forwards; i++) { | |
757 | debug("Connections to local port %d forwarded to remote address %.200s:%d", | |
758 | options.local_forwards[i].port, | |
759 | options.local_forwards[i].host, | |
760 | options.local_forwards[i].host_port); | |
02a024dd | 761 | success += channel_request_local_forwarding( |
fa08c86b | 762 | options.local_forwards[i].port, |
763 | options.local_forwards[i].host, | |
764 | options.local_forwards[i].host_port, | |
765 | options.gateway_ports); | |
766 | } | |
02a024dd | 767 | if (i > 0 && success == 0) |
768 | error("Could not request local forwarding."); | |
fa08c86b | 769 | |
770 | /* Initiate remote TCP/IP port forwardings. */ | |
771 | for (i = 0; i < options.num_remote_forwards; i++) { | |
772 | debug("Connections to remote port %d forwarded to local address %.200s:%d", | |
773 | options.remote_forwards[i].port, | |
774 | options.remote_forwards[i].host, | |
775 | options.remote_forwards[i].host_port); | |
776 | channel_request_remote_forwarding( | |
777 | options.remote_forwards[i].port, | |
778 | options.remote_forwards[i].host, | |
779 | options.remote_forwards[i].host_port); | |
780 | } | |
781 | } | |
782 | ||
783 | void | |
784 | check_agent_present(void) | |
785 | { | |
786 | if (options.forward_agent) { | |
787 | /* Clear agent forwarding if we don\'t have an agent. */ | |
788 | int authfd = ssh_get_authentication_socket(); | |
789 | if (authfd < 0) | |
790 | options.forward_agent = 0; | |
791 | else | |
792 | ssh_close_authentication_socket(authfd); | |
793 | } | |
794 | } | |
795 | ||
8ce64345 | 796 | int |
797 | ssh_session(void) | |
798 | { | |
799 | int type; | |
8ce64345 | 800 | int plen; |
801 | int interactive = 0; | |
802 | int have_tty = 0; | |
803 | struct winsize ws; | |
8ce64345 | 804 | char *cp; |
805 | ||
5260325f | 806 | /* Enable compression if requested. */ |
807 | if (options.compression) { | |
808 | debug("Requesting compression at level %d.", options.compression_level); | |
809 | ||
810 | if (options.compression_level < 1 || options.compression_level > 9) | |
811 | fatal("Compression level must be from 1 (fast) to 9 (slow, best)."); | |
812 | ||
813 | /* Send the request. */ | |
814 | packet_start(SSH_CMSG_REQUEST_COMPRESSION); | |
815 | packet_put_int(options.compression_level); | |
816 | packet_send(); | |
817 | packet_write_wait(); | |
818 | type = packet_read(&plen); | |
819 | if (type == SSH_SMSG_SUCCESS) | |
820 | packet_start_compression(options.compression_level); | |
821 | else if (type == SSH_SMSG_FAILURE) | |
822 | log("Warning: Remote host refused compression."); | |
823 | else | |
824 | packet_disconnect("Protocol error waiting for compression response."); | |
825 | } | |
826 | /* Allocate a pseudo tty if appropriate. */ | |
827 | if (tty_flag) { | |
828 | debug("Requesting pty."); | |
829 | ||
830 | /* Start the packet. */ | |
831 | packet_start(SSH_CMSG_REQUEST_PTY); | |
832 | ||
833 | /* Store TERM in the packet. There is no limit on the | |
834 | length of the string. */ | |
835 | cp = getenv("TERM"); | |
836 | if (!cp) | |
837 | cp = ""; | |
838 | packet_put_string(cp, strlen(cp)); | |
839 | ||
840 | /* Store window size in the packet. */ | |
841 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) | |
842 | memset(&ws, 0, sizeof(ws)); | |
843 | packet_put_int(ws.ws_row); | |
844 | packet_put_int(ws.ws_col); | |
845 | packet_put_int(ws.ws_xpixel); | |
846 | packet_put_int(ws.ws_ypixel); | |
847 | ||
848 | /* Store tty modes in the packet. */ | |
849 | tty_make_modes(fileno(stdin)); | |
850 | ||
851 | /* Send the packet, and wait for it to leave. */ | |
852 | packet_send(); | |
853 | packet_write_wait(); | |
854 | ||
855 | /* Read response from the server. */ | |
856 | type = packet_read(&plen); | |
4fe2af09 | 857 | if (type == SSH_SMSG_SUCCESS) { |
5260325f | 858 | interactive = 1; |
8ce64345 | 859 | have_tty = 1; |
4fe2af09 | 860 | } else if (type == SSH_SMSG_FAILURE) |
5260325f | 861 | log("Warning: Remote host failed or refused to allocate a pseudo tty."); |
862 | else | |
863 | packet_disconnect("Protocol error waiting for pty request response."); | |
864 | } | |
865 | /* Request X11 forwarding if enabled and DISPLAY is set. */ | |
866 | if (options.forward_x11 && getenv("DISPLAY") != NULL) { | |
0b242b12 | 867 | char proto[512], data[512]; |
868 | /* Get reasonable local authentication information. */ | |
869 | x11_get_proto(proto, sizeof proto, data, sizeof data); | |
870 | /* Request forwarding with authentication spoofing. */ | |
5260325f | 871 | debug("Requesting X11 forwarding with authentication spoofing."); |
0b242b12 | 872 | x11_request_forwarding_with_spoofing(0, proto, data); |
5260325f | 873 | |
874 | /* Read response from the server. */ | |
875 | type = packet_read(&plen); | |
876 | if (type == SSH_SMSG_SUCCESS) { | |
5260325f | 877 | interactive = 1; |
0b242b12 | 878 | } else if (type == SSH_SMSG_FAILURE) { |
5260325f | 879 | log("Warning: Remote host denied X11 forwarding."); |
0b242b12 | 880 | } else { |
5260325f | 881 | packet_disconnect("Protocol error waiting for X11 forwarding"); |
0b242b12 | 882 | } |
5260325f | 883 | } |
884 | /* Tell the packet module whether this is an interactive session. */ | |
b5c334cc | 885 | packet_set_interactive(interactive); |
5260325f | 886 | |
887 | /* Request authentication agent forwarding if appropriate. */ | |
fa08c86b | 888 | check_agent_present(); |
889 | ||
5260325f | 890 | if (options.forward_agent) { |
891 | debug("Requesting authentication agent forwarding."); | |
892 | auth_request_forwarding(); | |
893 | ||
894 | /* Read response from the server. */ | |
895 | type = packet_read(&plen); | |
896 | packet_integrity_check(plen, 0, type); | |
897 | if (type != SSH_SMSG_SUCCESS) | |
898 | log("Warning: Remote host denied authentication agent forwarding."); | |
899 | } | |
8efc0c15 | 900 | |
fa08c86b | 901 | /* Initiate port forwardings. */ |
902 | ssh_init_forwarding(); | |
5260325f | 903 | |
aa3378df | 904 | /* If requested, let ssh continue in the background. */ |
6ae2364d | 905 | if (fork_after_authentication_flag) |
aa3378df | 906 | if (daemon(1, 1) < 0) |
907 | fatal("daemon() failed: %.200s", strerror(errno)); | |
908 | ||
909 | /* | |
910 | * If a command was specified on the command line, execute the | |
911 | * command now. Otherwise request the server to start a shell. | |
912 | */ | |
5260325f | 913 | if (buffer_len(&command) > 0) { |
914 | int len = buffer_len(&command); | |
915 | if (len > 900) | |
916 | len = 900; | |
917 | debug("Sending command: %.*s", len, buffer_ptr(&command)); | |
918 | packet_start(SSH_CMSG_EXEC_CMD); | |
919 | packet_put_string(buffer_ptr(&command), buffer_len(&command)); | |
920 | packet_send(); | |
921 | packet_write_wait(); | |
922 | } else { | |
923 | debug("Requesting shell."); | |
924 | packet_start(SSH_CMSG_EXEC_SHELL); | |
925 | packet_send(); | |
926 | packet_write_wait(); | |
927 | } | |
928 | ||
929 | /* Enter the interactive session. */ | |
2e73a022 | 930 | return client_loop(have_tty, tty_flag ? options.escape_char : -1, 0); |
8ce64345 | 931 | } |
5260325f | 932 | |
1f3bf5aa | 933 | void |
934 | client_subsystem_reply(int type, int plen, void *ctxt) | |
935 | { | |
936 | int id, len; | |
937 | ||
938 | id = packet_get_int(); | |
939 | len = buffer_len(&command); | |
940 | len = MAX(len, 900); | |
941 | packet_done(); | |
942 | if (type == SSH2_MSG_CHANNEL_FAILURE) | |
943 | fatal("Request for subsystem '%.*s' failed on channel %d", | |
944 | len, buffer_ptr(&command), id); | |
945 | } | |
946 | ||
8ce64345 | 947 | void |
fa08c86b | 948 | ssh_session2_callback(int id, void *arg) |
8ce64345 | 949 | { |
950 | int len; | |
b5c334cc | 951 | int interactive = 0; |
952 | ||
6a416424 | 953 | debug("client_init id %d arg %ld", id, (long)arg); |
8ce64345 | 954 | |
955 | if (no_shell_flag) | |
956 | goto done; | |
957 | ||
958 | if (tty_flag) { | |
959 | struct winsize ws; | |
960 | char *cp; | |
961 | cp = getenv("TERM"); | |
962 | if (!cp) | |
963 | cp = ""; | |
964 | /* Store window size in the packet. */ | |
965 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) | |
966 | memset(&ws, 0, sizeof(ws)); | |
967 | ||
968 | channel_request_start(id, "pty-req", 0); | |
969 | packet_put_cstring(cp); | |
970 | packet_put_int(ws.ws_col); | |
971 | packet_put_int(ws.ws_row); | |
972 | packet_put_int(ws.ws_xpixel); | |
973 | packet_put_int(ws.ws_ypixel); | |
974 | packet_put_cstring(""); /* XXX: encode terminal modes */ | |
975 | packet_send(); | |
b5c334cc | 976 | interactive = 1; |
8ce64345 | 977 | /* XXX wait for reply */ |
978 | } | |
0b242b12 | 979 | if (options.forward_x11 && |
980 | getenv("DISPLAY") != NULL) { | |
981 | char proto[512], data[512]; | |
982 | /* Get reasonable local authentication information. */ | |
983 | x11_get_proto(proto, sizeof proto, data, sizeof data); | |
984 | /* Request forwarding with authentication spoofing. */ | |
985 | debug("Requesting X11 forwarding with authentication spoofing."); | |
986 | x11_request_forwarding_with_spoofing(id, proto, data); | |
b5c334cc | 987 | interactive = 1; |
0b242b12 | 988 | /* XXX wait for reply */ |
989 | } | |
990 | ||
fa08c86b | 991 | check_agent_present(); |
992 | if (options.forward_agent) { | |
993 | debug("Requesting authentication agent forwarding."); | |
994 | channel_request_start(id, "auth-agent-req@openssh.com", 0); | |
995 | packet_send(); | |
996 | } | |
997 | ||
8ce64345 | 998 | len = buffer_len(&command); |
999 | if (len > 0) { | |
1000 | if (len > 900) | |
1001 | len = 900; | |
ae810de7 | 1002 | if (subsystem_flag) { |
1003 | debug("Sending subsystem: %.*s", len, buffer_ptr(&command)); | |
1f3bf5aa | 1004 | channel_request_start(id, "subsystem", /*want reply*/ 1); |
1005 | /* register callback for reply */ | |
1006 | /* XXX we asume that client_loop has already been called */ | |
1007 | dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &client_subsystem_reply); | |
1008 | dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &client_subsystem_reply); | |
ae810de7 | 1009 | } else { |
1010 | debug("Sending command: %.*s", len, buffer_ptr(&command)); | |
1011 | channel_request_start(id, "exec", 0); | |
1012 | } | |
8ce64345 | 1013 | packet_put_string(buffer_ptr(&command), len); |
1014 | packet_send(); | |
1015 | } else { | |
1016 | channel_request(id, "shell", 0); | |
1017 | } | |
1018 | /* channel_callback(id, SSH2_MSG_OPEN_CONFIGMATION, client_init, 0); */ | |
1f3bf5aa | 1019 | |
8ce64345 | 1020 | done: |
1021 | /* register different callback, etc. XXX */ | |
b5c334cc | 1022 | packet_set_interactive(interactive); |
8ce64345 | 1023 | } |
1024 | ||
1025 | int | |
1026 | ssh_session2(void) | |
1027 | { | |
1028 | int window, packetmax, id; | |
2e73a022 | 1029 | int in, out, err; |
1030 | ||
14a9a859 | 1031 | if (stdin_null_flag) { |
5ca51e19 | 1032 | in = open(_PATH_DEVNULL, O_RDONLY); |
14a9a859 | 1033 | } else { |
1034 | in = dup(STDIN_FILENO); | |
1035 | } | |
2e73a022 | 1036 | out = dup(STDOUT_FILENO); |
1037 | err = dup(STDERR_FILENO); | |
8ce64345 | 1038 | |
1039 | if (in < 0 || out < 0 || err < 0) | |
14a9a859 | 1040 | fatal("dup() in/out/err failed"); |
8ce64345 | 1041 | |
a22aff1f | 1042 | /* enable nonblocking unless tty */ |
1043 | if (!isatty(in)) | |
1044 | set_nonblock(in); | |
1045 | if (!isatty(out)) | |
1046 | set_nonblock(out); | |
1047 | if (!isatty(err)) | |
1048 | set_nonblock(err); | |
1049 | ||
fa08c86b | 1050 | /* XXX should be pre-session */ |
1051 | ssh_init_forwarding(); | |
2b87da3b | 1052 | |
14a9a859 | 1053 | /* If requested, let ssh continue in the background. */ |
1054 | if (fork_after_authentication_flag) | |
1055 | if (daemon(1, 1) < 0) | |
1056 | fatal("daemon() failed: %.200s", strerror(errno)); | |
1057 | ||
bcbf86ec | 1058 | window = CHAN_SES_WINDOW_DEFAULT; |
1059 | packetmax = CHAN_SES_PACKET_DEFAULT; | |
1060 | if (!tty_flag) { | |
8ce64345 | 1061 | window *= 2; |
bcbf86ec | 1062 | packetmax *=2; |
8ce64345 | 1063 | } |
8ce64345 | 1064 | id = channel_new( |
1065 | "session", SSH_CHANNEL_OPENING, in, out, err, | |
bcbf86ec | 1066 | window, packetmax, CHAN_EXTENDED_WRITE, |
a22aff1f | 1067 | xstrdup("client-session"), /*nonblock*/0); |
8ce64345 | 1068 | |
8ce64345 | 1069 | channel_open(id); |
fa08c86b | 1070 | channel_register_callback(id, SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, |
1071 | ssh_session2_callback, (void *)0); | |
5260325f | 1072 | |
2e73a022 | 1073 | return client_loop(tty_flag, tty_flag ? options.escape_char : -1, id); |
8efc0c15 | 1074 | } |
fa08c86b | 1075 | |
1076 | int | |
1077 | guess_identity_file_type(const char *filename) | |
1078 | { | |
1079 | struct stat st; | |
1080 | Key *public; | |
1081 | int type = KEY_RSA1; /* default */ | |
1082 | ||
1083 | if (stat(filename, &st) < 0) { | |
d343d900 | 1084 | /* ignore this key */ |
fa08c86b | 1085 | return KEY_UNSPEC; |
1086 | } | |
1087 | public = key_new(type); | |
1088 | if (!load_public_key(filename, public, NULL)) { | |
1089 | /* ok, so we will assume this is 'some' key */ | |
1090 | type = KEY_UNSPEC; | |
1091 | } | |
1092 | key_free(public); | |
1093 | return type; | |
1094 | } |