]>
Commit | Line | Data |
---|---|---|
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" | |
a01a5f30 | 42 | RCSID("$OpenBSD: ssh.c,v 1.99 2001/03/01 02:29:04 deraadt 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"); |
a01a5f30 | 164 | fprintf(stderr, " -i file Identity for public key authentication " |
165 | "(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: " | |
a01a5f30 | 177 | "``3des'', ``blowfish''\n"); |
5260325f | 178 | fprintf(stderr, " -p port Connect to this port. Server must be on the same port.\n"); |
179 | fprintf(stderr, " -L listen-port:host:port Forward local port to remote address\n"); | |
180 | fprintf(stderr, " -R listen-port:host:port Forward remote port to local address\n"); | |
1fe6a48f | 181 | fprintf(stderr, " These cause %s to listen for connections on a port, and\n", __progname); |
5260325f | 182 | fprintf(stderr, " forward them to the other side by connecting to host:port.\n"); |
183 | fprintf(stderr, " -C Enable compression.\n"); | |
8ce64345 | 184 | fprintf(stderr, " -N Do not execute a shell or command.\n"); |
5260325f | 185 | fprintf(stderr, " -g Allow remote hosts to connect to forwarded ports.\n"); |
1f3bf5aa | 186 | fprintf(stderr, " -1 Force protocol version 1.\n"); |
187 | fprintf(stderr, " -2 Force protocol version 2.\n"); | |
48e671d5 | 188 | fprintf(stderr, " -4 Use IPv4 only.\n"); |
189 | fprintf(stderr, " -6 Use IPv6 only.\n"); | |
5260325f | 190 | fprintf(stderr, " -o 'option' Process the option as if it was read from a configuration file.\n"); |
ae810de7 | 191 | fprintf(stderr, " -s Invoke command (mandatory) as SSH2 subsystem.\n"); |
5260325f | 192 | exit(1); |
8efc0c15 | 193 | } |
194 | ||
5260325f | 195 | /* |
196 | * Connects to the given host using rsh (or prints an error message and exits | |
197 | * if rsh is not available). This function never returns. | |
198 | */ | |
8efc0c15 | 199 | void |
5260325f | 200 | rsh_connect(char *host, char *user, Buffer * command) |
8efc0c15 | 201 | { |
5260325f | 202 | char *args[10]; |
203 | int i; | |
204 | ||
205 | log("Using rsh. WARNING: Connection will not be encrypted."); | |
206 | /* Build argument list for rsh. */ | |
207 | i = 0; | |
208 | args[i++] = _PATH_RSH; | |
209 | /* host may have to come after user on some systems */ | |
210 | args[i++] = host; | |
211 | if (user) { | |
212 | args[i++] = "-l"; | |
213 | args[i++] = user; | |
214 | } | |
215 | if (buffer_len(command) > 0) { | |
216 | buffer_append(command, "\0", 1); | |
217 | args[i++] = buffer_ptr(command); | |
218 | } | |
219 | args[i++] = NULL; | |
220 | if (debug_flag) { | |
221 | for (i = 0; args[i]; i++) { | |
222 | if (i != 0) | |
223 | fprintf(stderr, " "); | |
224 | fprintf(stderr, "%s", args[i]); | |
225 | } | |
226 | fprintf(stderr, "\n"); | |
8efc0c15 | 227 | } |
5260325f | 228 | execv(_PATH_RSH, args); |
229 | perror(_PATH_RSH); | |
230 | exit(1); | |
8efc0c15 | 231 | } |
232 | ||
fa08c86b | 233 | int ssh_session(void); |
234 | int ssh_session2(void); | |
235 | int guess_identity_file_type(const char *filename); | |
8ce64345 | 236 | |
5260325f | 237 | /* |
238 | * Main program for the ssh client. | |
239 | */ | |
8efc0c15 | 240 | int |
241 | main(int ac, char **av) | |
242 | { | |
8ce64345 | 243 | int i, opt, optind, exit_status, ok; |
57112b5a | 244 | u_short fwd_port, fwd_host_port; |
5260325f | 245 | char *optarg, *cp, buf[256]; |
5260325f | 246 | struct stat st; |
3b1a83df | 247 | struct passwd *pw; |
8ce64345 | 248 | int dummy; |
5260325f | 249 | uid_t original_effective_uid; |
5260325f | 250 | |
260d427b | 251 | __progname = get_progname(av[0]); |
264dce47 | 252 | init_rng(); |
253 | ||
aa3378df | 254 | /* |
255 | * Save the original real uid. It will be needed later (uid-swapping | |
256 | * may clobber the real uid). | |
257 | */ | |
5260325f | 258 | original_real_uid = getuid(); |
259 | original_effective_uid = geteuid(); | |
260 | ||
7322ef0e | 261 | #ifdef HAVE_SETRLIMIT |
5260325f | 262 | /* If we are installed setuid root be careful to not drop core. */ |
263 | if (original_real_uid != original_effective_uid) { | |
264 | struct rlimit rlim; | |
265 | rlim.rlim_cur = rlim.rlim_max = 0; | |
266 | if (setrlimit(RLIMIT_CORE, &rlim) < 0) | |
267 | fatal("setrlimit failed: %.100s", strerror(errno)); | |
8efc0c15 | 268 | } |
3c62e7eb | 269 | #endif |
aa3378df | 270 | /* |
271 | * Use uid-swapping to give up root privileges for the duration of | |
272 | * option processing. We will re-instantiate the rights when we are | |
273 | * ready to create the privileged port, and will permanently drop | |
274 | * them when the port has been created (actually, when the connection | |
275 | * has been made, as we may need to create the port several times). | |
276 | */ | |
5260325f | 277 | temporarily_use_uid(original_real_uid); |
278 | ||
aa3378df | 279 | /* |
280 | * Set our umask to something reasonable, as some files are created | |
281 | * with the default umask. This will make them world-readable but | |
282 | * writable only by the owner, which is ok for all files for which we | |
283 | * don't set the modes explicitly. | |
284 | */ | |
5260325f | 285 | umask(022); |
286 | ||
5260325f | 287 | /* Initialize option structure to indicate that no values have been set. */ |
288 | initialize_options(&options); | |
289 | ||
290 | /* Parse command-line arguments. */ | |
291 | host = NULL; | |
292 | ||
5260325f | 293 | for (optind = 1; optind < ac; optind++) { |
294 | if (av[optind][0] != '-') { | |
295 | if (host) | |
296 | break; | |
297 | if ((cp = strchr(av[optind], '@'))) { | |
6ae2364d | 298 | if(cp == av[optind]) |
299 | usage(); | |
5260325f | 300 | options.user = av[optind]; |
301 | *cp = '\0'; | |
302 | host = ++cp; | |
303 | } else | |
304 | host = av[optind]; | |
305 | continue; | |
306 | } | |
307 | opt = av[optind][1]; | |
308 | if (!opt) | |
309 | usage(); | |
b2552997 | 310 | if (strchr("eilcmpLRo", opt)) { /* options with arguments */ |
5260325f | 311 | optarg = av[optind] + 2; |
312 | if (strcmp(optarg, "") == 0) { | |
313 | if (optind >= ac - 1) | |
314 | usage(); | |
315 | optarg = av[++optind]; | |
316 | } | |
317 | } else { | |
318 | if (av[optind][2]) | |
319 | usage(); | |
320 | optarg = NULL; | |
321 | } | |
322 | switch (opt) { | |
1f3bf5aa | 323 | case '1': |
324 | options.protocol = SSH_PROTO_1; | |
325 | break; | |
6ae2364d | 326 | case '2': |
327 | options.protocol = SSH_PROTO_2; | |
328 | break; | |
48e671d5 | 329 | case '4': |
330 | IPv4or6 = AF_INET; | |
331 | break; | |
48e671d5 | 332 | case '6': |
333 | IPv4or6 = AF_INET6; | |
334 | break; | |
5260325f | 335 | case 'n': |
336 | stdin_null_flag = 1; | |
337 | break; | |
5260325f | 338 | case 'f': |
339 | fork_after_authentication_flag = 1; | |
340 | stdin_null_flag = 1; | |
341 | break; | |
5260325f | 342 | case 'x': |
343 | options.forward_x11 = 0; | |
344 | break; | |
5260325f | 345 | case 'X': |
346 | options.forward_x11 = 1; | |
347 | break; | |
5260325f | 348 | case 'g': |
349 | options.gateway_ports = 1; | |
350 | break; | |
5260325f | 351 | case 'P': |
352 | options.use_privileged_port = 0; | |
353 | break; | |
5260325f | 354 | case 'a': |
355 | options.forward_agent = 0; | |
356 | break; | |
71276795 | 357 | case 'A': |
358 | options.forward_agent = 1; | |
359 | break; | |
5260325f | 360 | #ifdef AFS |
361 | case 'k': | |
362 | options.kerberos_tgt_passing = 0; | |
363 | options.afs_token_passing = 0; | |
364 | break; | |
365 | #endif | |
366 | case 'i': | |
367 | if (stat(optarg, &st) < 0) { | |
368 | fprintf(stderr, "Warning: Identity file %s does not exist.\n", | |
fa08c86b | 369 | optarg); |
5260325f | 370 | break; |
371 | } | |
372 | if (options.num_identity_files >= SSH_MAX_IDENTITY_FILES) | |
373 | fatal("Too many identity files specified (max %d)", | |
fa08c86b | 374 | SSH_MAX_IDENTITY_FILES); |
375 | options.identity_files[options.num_identity_files++] = xstrdup(optarg); | |
5260325f | 376 | break; |
5260325f | 377 | case 't': |
8abcdba4 | 378 | if (tty_flag) |
379 | force_tty_flag = 1; | |
5260325f | 380 | tty_flag = 1; |
381 | break; | |
5260325f | 382 | case 'v': |
bcbf86ec | 383 | if (0 == debug_flag) { |
384 | debug_flag = 1; | |
385 | options.log_level = SYSLOG_LEVEL_DEBUG1; | |
386 | } else if (options.log_level < SYSLOG_LEVEL_DEBUG3) { | |
387 | options.log_level++; | |
388 | break; | |
389 | } else { | |
390 | fatal("Too high debugging level.\n"); | |
391 | } | |
392 | /* fallthrough */ | |
5260325f | 393 | case 'V': |
e68225b2 | 394 | fprintf(stderr, |
395 | "%s, SSH protocols %d.%d/%d.%d, OpenSSL 0x%8.8lx\n", | |
a8be9f80 | 396 | SSH_VERSION, |
397 | PROTOCOL_MAJOR_1, PROTOCOL_MINOR_1, | |
e68225b2 | 398 | PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2, |
399 | SSLeay()); | |
5260325f | 400 | if (opt == 'V') |
401 | exit(0); | |
5260325f | 402 | break; |
5260325f | 403 | case 'q': |
404 | options.log_level = SYSLOG_LEVEL_QUIET; | |
405 | break; | |
5260325f | 406 | case 'e': |
407 | if (optarg[0] == '^' && optarg[2] == 0 && | |
1e3b8b07 | 408 | (u_char) optarg[1] >= 64 && (u_char) optarg[1] < 128) |
409 | options.escape_char = (u_char) optarg[1] & 31; | |
5260325f | 410 | else if (strlen(optarg) == 1) |
1e3b8b07 | 411 | options.escape_char = (u_char) optarg[0]; |
5260325f | 412 | else if (strcmp(optarg, "none") == 0) |
413 | options.escape_char = -2; | |
414 | else { | |
415 | fprintf(stderr, "Bad escape character '%s'.\n", optarg); | |
416 | exit(1); | |
417 | } | |
418 | break; | |
5260325f | 419 | case 'c': |
a306f2dd | 420 | if (ciphers_valid(optarg)) { |
421 | /* SSH2 only */ | |
422 | options.ciphers = xstrdup(optarg); | |
d0c832f3 | 423 | options.cipher = SSH_CIPHER_ILLEGAL; |
a306f2dd | 424 | } else { |
425 | /* SSH1 only */ | |
c523303b | 426 | options.cipher = cipher_number(optarg); |
427 | if (options.cipher == -1) { | |
a306f2dd | 428 | fprintf(stderr, "Unknown cipher type '%s'\n", optarg); |
429 | exit(1); | |
430 | } | |
c523303b | 431 | if (options.cipher == SSH_CIPHER_3DES) { |
432 | options.ciphers = "3des-cbc"; | |
433 | } else if (options.cipher == SSH_CIPHER_BLOWFISH) { | |
434 | options.ciphers = "blowfish-cbc"; | |
435 | } else { | |
436 | options.ciphers = (char *)-1; | |
437 | } | |
5260325f | 438 | } |
439 | break; | |
b2552997 | 440 | case 'm': |
441 | if (mac_valid(optarg)) | |
442 | options.macs = xstrdup(optarg); | |
443 | else { | |
444 | fprintf(stderr, "Unknown mac type '%s'\n", optarg); | |
445 | exit(1); | |
446 | } | |
447 | break; | |
5260325f | 448 | case 'p': |
449 | options.port = atoi(optarg); | |
5260325f | 450 | break; |
5260325f | 451 | case 'l': |
452 | options.user = optarg; | |
453 | break; | |
5260325f | 454 | case 'R': |
48e671d5 | 455 | if (sscanf(optarg, "%hu/%255[^/]/%hu", &fwd_port, buf, |
456 | &fwd_host_port) != 3 && | |
457 | sscanf(optarg, "%hu:%255[^:]:%hu", &fwd_port, buf, | |
458 | &fwd_host_port) != 3) { | |
5260325f | 459 | fprintf(stderr, "Bad forwarding specification '%s'.\n", optarg); |
460 | usage(); | |
461 | /* NOTREACHED */ | |
462 | } | |
463 | add_remote_forward(&options, fwd_port, buf, fwd_host_port); | |
464 | break; | |
5260325f | 465 | case 'L': |
48e671d5 | 466 | if (sscanf(optarg, "%hu/%255[^/]/%hu", &fwd_port, buf, |
467 | &fwd_host_port) != 3 && | |
468 | sscanf(optarg, "%hu:%255[^:]:%hu", &fwd_port, buf, | |
469 | &fwd_host_port) != 3) { | |
5260325f | 470 | fprintf(stderr, "Bad forwarding specification '%s'.\n", optarg); |
471 | usage(); | |
472 | /* NOTREACHED */ | |
473 | } | |
474 | add_local_forward(&options, fwd_port, buf, fwd_host_port); | |
475 | break; | |
5260325f | 476 | case 'C': |
477 | options.compression = 1; | |
478 | break; | |
8ce64345 | 479 | case 'N': |
480 | no_shell_flag = 1; | |
481 | no_tty_flag = 1; | |
482 | break; | |
8ce64345 | 483 | case 'T': |
484 | no_tty_flag = 1; | |
485 | break; | |
5260325f | 486 | case 'o': |
487 | dummy = 1; | |
488 | if (process_config_line(&options, host ? host : "", optarg, | |
489 | "command-line", 0, &dummy) != 0) | |
490 | exit(1); | |
491 | break; | |
ae810de7 | 492 | case 's': |
493 | subsystem_flag = 1; | |
494 | break; | |
5260325f | 495 | default: |
496 | usage(); | |
497 | } | |
498 | } | |
499 | ||
500 | /* Check that we got a host name. */ | |
501 | if (!host) | |
8efc0c15 | 502 | usage(); |
5260325f | 503 | |
22d89d24 | 504 | SSLeay_add_all_algorithms(); |
fa08c86b | 505 | ERR_load_crypto_strings(); |
22d89d24 | 506 | |
5260325f | 507 | /* Initialize the command to execute on remote host. */ |
508 | buffer_init(&command); | |
509 | ||
aa3378df | 510 | /* |
511 | * Save the command to execute on the remote host in a buffer. There | |
512 | * is no limit on the length of the command, except by the maximum | |
513 | * packet size. Also sets the tty flag if there is no command. | |
514 | */ | |
5260325f | 515 | if (optind == ac) { |
516 | /* No command specified - execute shell on a tty. */ | |
517 | tty_flag = 1; | |
ae810de7 | 518 | if (subsystem_flag) { |
519 | fprintf(stderr, "You must specify a subsystem to invoke."); | |
520 | usage(); | |
521 | } | |
5260325f | 522 | } else { |
523 | /* A command has been specified. Store it into the | |
524 | buffer. */ | |
525 | for (i = optind; i < ac; i++) { | |
526 | if (i > optind) | |
527 | buffer_append(&command, " ", 1); | |
528 | buffer_append(&command, av[i], strlen(av[i])); | |
529 | } | |
8efc0c15 | 530 | } |
5260325f | 531 | |
532 | /* Cannot fork to background if no command. */ | |
14a9a859 | 533 | if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag) |
5260325f | 534 | fatal("Cannot fork into background without a command to execute."); |
535 | ||
536 | /* Allocate a tty by default if no command specified. */ | |
537 | if (buffer_len(&command) == 0) | |
538 | tty_flag = 1; | |
539 | ||
0b6fbf03 | 540 | /* Force no tty*/ |
541 | if (no_tty_flag) | |
542 | tty_flag = 0; | |
5260325f | 543 | /* Do not allocate a tty if stdin is not a tty. */ |
8abcdba4 | 544 | if (!isatty(fileno(stdin)) && !force_tty_flag) { |
5260325f | 545 | if (tty_flag) |
b5c334cc | 546 | log("Pseudo-terminal will not be allocated because stdin is not a terminal.\n"); |
5260325f | 547 | tty_flag = 0; |
548 | } | |
8ce64345 | 549 | |
5260325f | 550 | /* Get user data. */ |
551 | pw = getpwuid(original_real_uid); | |
552 | if (!pw) { | |
b5c334cc | 553 | log("You don't exist, go away!\n"); |
5260325f | 554 | exit(1); |
555 | } | |
556 | /* Take a copy of the returned structure. */ | |
3b1a83df | 557 | pw = pwcopy(pw); |
5260325f | 558 | |
559 | /* Initialize "log" output. Since we are the client all output | |
560 | actually goes to the terminal. */ | |
561 | log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 0); | |
562 | ||
563 | /* Read per-user configuration file. */ | |
42f11eb2 | 564 | snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, _PATH_SSH_USER_CONFFILE); |
5260325f | 565 | read_config_file(buf, host, &options); |
566 | ||
567 | /* Read systemwide configuration file. */ | |
42f11eb2 | 568 | read_config_file(_PATH_HOST_CONFIG_FILE, host, &options); |
5260325f | 569 | |
570 | /* Fill configuration defaults. */ | |
571 | fill_default_options(&options); | |
572 | ||
573 | /* reinit */ | |
574 | log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 0); | |
575 | ||
576 | if (options.user == NULL) | |
577 | options.user = xstrdup(pw->pw_name); | |
578 | ||
579 | if (options.hostname != NULL) | |
580 | host = options.hostname; | |
581 | ||
5260325f | 582 | /* Disable rhosts authentication if not running as root. */ |
3c62e7eb | 583 | #ifdef HAVE_CYGWIN |
584 | /* Ignore uid if running under Windows */ | |
585 | if (!options.use_privileged_port) { | |
586 | #else | |
5260325f | 587 | if (original_effective_uid != 0 || !options.use_privileged_port) { |
3c62e7eb | 588 | #endif |
6ffc9c88 | 589 | debug("Rhosts Authentication disabled, " |
590 | "originating port will not be trusted."); | |
5260325f | 591 | options.rhosts_authentication = 0; |
5260325f | 592 | } |
aa3378df | 593 | /* |
594 | * If using rsh has been selected, exec it now (without trying | |
595 | * anything else). Note that we must release privileges first. | |
596 | */ | |
5260325f | 597 | if (options.use_rsh) { |
aa3378df | 598 | /* |
599 | * Restore our superuser privileges. This must be done | |
600 | * before permanently setting the uid. | |
601 | */ | |
5260325f | 602 | restore_uid(); |
603 | ||
604 | /* Switch to the original uid permanently. */ | |
605 | permanently_set_uid(original_real_uid); | |
606 | ||
607 | /* Execute rsh. */ | |
608 | rsh_connect(host, options.user, &command); | |
609 | fatal("rsh_connect returned"); | |
8efc0c15 | 610 | } |
5260325f | 611 | /* Restore our superuser privileges. */ |
612 | restore_uid(); | |
613 | ||
6ffc9c88 | 614 | /* Open a connection to the remote host. */ |
5260325f | 615 | |
616 | ok = ssh_connect(host, &hostaddr, options.port, | |
6ffc9c88 | 617 | options.connection_attempts, |
618 | original_effective_uid != 0 || !options.use_privileged_port, | |
619 | original_real_uid, | |
620 | options.proxy_command); | |
5260325f | 621 | |
aa3378df | 622 | /* |
623 | * If we successfully made the connection, load the host private key | |
624 | * in case we will need it later for combined rsa-rhosts | |
625 | * authentication. This must be done before releasing extra | |
626 | * privileges, because the file is only readable by root. | |
627 | */ | |
a306f2dd | 628 | if (ok && (options.protocol & SSH_PROTO_1)) { |
629 | Key k; | |
5260325f | 630 | host_private_key = RSA_new(); |
fa08c86b | 631 | k.type = KEY_RSA1; |
a306f2dd | 632 | k.rsa = host_private_key; |
42f11eb2 | 633 | if (load_private_key(_PATH_HOST_KEY_FILE, "", &k, NULL)) |
5260325f | 634 | host_private_key_loaded = 1; |
635 | } | |
aa3378df | 636 | /* |
637 | * Get rid of any extra privileges that we may have. We will no | |
638 | * longer need them. Also, extra privileges could make it very hard | |
639 | * to read identity files and other non-world-readable files from the | |
640 | * user's home directory if it happens to be on a NFS volume where | |
641 | * root is mapped to nobody. | |
642 | */ | |
643 | ||
644 | /* | |
645 | * Note that some legacy systems need to postpone the following call | |
646 | * to permanently_set_uid() until the private hostkey is destroyed | |
647 | * with RSA_free(). Otherwise the calling user could ptrace() the | |
648 | * process, read the private hostkey and impersonate the host. | |
649 | * OpenBSD does not allow ptracing of setuid processes. | |
650 | */ | |
5260325f | 651 | permanently_set_uid(original_real_uid); |
652 | ||
aa3378df | 653 | /* |
654 | * Now that we are back to our own permissions, create ~/.ssh | |
655 | * directory if it doesn\'t already exist. | |
656 | */ | |
42f11eb2 | 657 | snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, _PATH_SSH_USER_DIR); |
5260325f | 658 | if (stat(buf, &st) < 0) |
704b1659 | 659 | if (mkdir(buf, 0700) < 0) |
5260325f | 660 | error("Could not create directory '%.200s'.", buf); |
661 | ||
662 | /* Check if the connection failed, and try "rsh" if appropriate. */ | |
663 | if (!ok) { | |
664 | if (options.port != 0) | |
57112b5a | 665 | log("Secure connection to %.100s on port %hu refused%.100s.", |
5260325f | 666 | host, options.port, |
667 | options.fallback_to_rsh ? "; reverting to insecure method" : ""); | |
668 | else | |
669 | log("Secure connection to %.100s refused%.100s.", host, | |
670 | options.fallback_to_rsh ? "; reverting to insecure method" : ""); | |
671 | ||
672 | if (options.fallback_to_rsh) { | |
673 | rsh_connect(host, options.user, &command); | |
674 | fatal("rsh_connect returned"); | |
675 | } | |
676 | exit(1); | |
8efc0c15 | 677 | } |
fa08c86b | 678 | /* Expand ~ in options.identity_files, known host file names. */ |
a306f2dd | 679 | /* XXX mem-leaks */ |
fa08c86b | 680 | for (i = 0; i < options.num_identity_files; i++) { |
5260325f | 681 | options.identity_files[i] = |
fa08c86b | 682 | tilde_expand_filename(options.identity_files[i], original_real_uid); |
683 | options.identity_files_type[i] = guess_identity_file_type(options.identity_files[i]); | |
684 | debug("identity file %s type %d", options.identity_files[i], | |
685 | options.identity_files_type[i]); | |
686 | } | |
687 | options.system_hostfile = | |
688 | tilde_expand_filename(options.system_hostfile, original_real_uid); | |
689 | options.user_hostfile = | |
690 | tilde_expand_filename(options.user_hostfile, original_real_uid); | |
691 | options.system_hostfile2 = | |
692 | tilde_expand_filename(options.system_hostfile2, original_real_uid); | |
693 | options.user_hostfile2 = | |
694 | tilde_expand_filename(options.user_hostfile2, original_real_uid); | |
5260325f | 695 | |
696 | /* Log into the remote system. This never returns if the login fails. */ | |
697 | ssh_login(host_private_key_loaded, host_private_key, | |
48e671d5 | 698 | host, (struct sockaddr *)&hostaddr, original_real_uid); |
5260325f | 699 | |
700 | /* We no longer need the host private key. Clear it now. */ | |
701 | if (host_private_key_loaded) | |
702 | RSA_free(host_private_key); /* Destroys contents safely */ | |
703 | ||
8ce64345 | 704 | exit_status = compat20 ? ssh_session2() : ssh_session(); |
705 | packet_close(); | |
706 | return exit_status; | |
707 | } | |
708 | ||
0b242b12 | 709 | void |
710 | x11_get_proto(char *proto, int proto_len, char *data, int data_len) | |
711 | { | |
712 | char line[512]; | |
713 | FILE *f; | |
714 | int got_data = 0, i; | |
715 | ||
fa649821 | 716 | if (options.xauth_location) { |
717 | /* Try to get Xauthority information for the display. */ | |
5ca51e19 | 718 | snprintf(line, sizeof line, "%.100s list %.200s 2>" _PATH_DEVNULL, |
fa649821 | 719 | options.xauth_location, getenv("DISPLAY")); |
720 | f = popen(line, "r"); | |
721 | if (f && fgets(line, sizeof(line), f) && | |
722 | sscanf(line, "%*s %s %s", proto, data) == 2) | |
723 | got_data = 1; | |
724 | if (f) | |
725 | pclose(f); | |
726 | } | |
0b242b12 | 727 | /* |
728 | * If we didn't get authentication data, just make up some | |
729 | * data. The forwarding code will check the validity of the | |
730 | * response anyway, and substitute this data. The X11 | |
731 | * server, however, will ignore this fake data and use | |
732 | * whatever authentication mechanisms it was using otherwise | |
733 | * for the local connection. | |
734 | */ | |
735 | if (!got_data) { | |
736 | u_int32_t rand = 0; | |
737 | ||
738 | strlcpy(proto, "MIT-MAGIC-COOKIE-1", proto_len); | |
739 | for (i = 0; i < 16; i++) { | |
740 | if (i % 4 == 0) | |
741 | rand = arc4random(); | |
742 | snprintf(data + 2 * i, data_len - 2 * i, "%02x", rand & 0xff); | |
743 | rand >>= 8; | |
744 | } | |
745 | } | |
746 | } | |
747 | ||
fa08c86b | 748 | void |
749 | ssh_init_forwarding(void) | |
750 | { | |
02a024dd | 751 | int success = 0; |
fa08c86b | 752 | int i; |
02a024dd | 753 | |
fa08c86b | 754 | /* Initiate local TCP/IP port forwardings. */ |
755 | for (i = 0; i < options.num_local_forwards; i++) { | |
756 | debug("Connections to local port %d forwarded to remote address %.200s:%d", | |
757 | options.local_forwards[i].port, | |
758 | options.local_forwards[i].host, | |
759 | options.local_forwards[i].host_port); | |
02a024dd | 760 | success += channel_request_local_forwarding( |
fa08c86b | 761 | options.local_forwards[i].port, |
762 | options.local_forwards[i].host, | |
763 | options.local_forwards[i].host_port, | |
764 | options.gateway_ports); | |
765 | } | |
02a024dd | 766 | if (i > 0 && success == 0) |
767 | error("Could not request local forwarding."); | |
fa08c86b | 768 | |
769 | /* Initiate remote TCP/IP port forwardings. */ | |
770 | for (i = 0; i < options.num_remote_forwards; i++) { | |
771 | debug("Connections to remote port %d forwarded to local address %.200s:%d", | |
772 | options.remote_forwards[i].port, | |
773 | options.remote_forwards[i].host, | |
774 | options.remote_forwards[i].host_port); | |
775 | channel_request_remote_forwarding( | |
776 | options.remote_forwards[i].port, | |
777 | options.remote_forwards[i].host, | |
778 | options.remote_forwards[i].host_port); | |
779 | } | |
780 | } | |
781 | ||
782 | void | |
783 | check_agent_present(void) | |
784 | { | |
785 | if (options.forward_agent) { | |
786 | /* Clear agent forwarding if we don\'t have an agent. */ | |
787 | int authfd = ssh_get_authentication_socket(); | |
788 | if (authfd < 0) | |
789 | options.forward_agent = 0; | |
790 | else | |
791 | ssh_close_authentication_socket(authfd); | |
792 | } | |
793 | } | |
794 | ||
8ce64345 | 795 | int |
796 | ssh_session(void) | |
797 | { | |
798 | int type; | |
8ce64345 | 799 | int plen; |
800 | int interactive = 0; | |
801 | int have_tty = 0; | |
802 | struct winsize ws; | |
8ce64345 | 803 | char *cp; |
804 | ||
5260325f | 805 | /* Enable compression if requested. */ |
806 | if (options.compression) { | |
807 | debug("Requesting compression at level %d.", options.compression_level); | |
808 | ||
809 | if (options.compression_level < 1 || options.compression_level > 9) | |
810 | fatal("Compression level must be from 1 (fast) to 9 (slow, best)."); | |
811 | ||
812 | /* Send the request. */ | |
813 | packet_start(SSH_CMSG_REQUEST_COMPRESSION); | |
814 | packet_put_int(options.compression_level); | |
815 | packet_send(); | |
816 | packet_write_wait(); | |
817 | type = packet_read(&plen); | |
818 | if (type == SSH_SMSG_SUCCESS) | |
819 | packet_start_compression(options.compression_level); | |
820 | else if (type == SSH_SMSG_FAILURE) | |
821 | log("Warning: Remote host refused compression."); | |
822 | else | |
823 | packet_disconnect("Protocol error waiting for compression response."); | |
824 | } | |
825 | /* Allocate a pseudo tty if appropriate. */ | |
826 | if (tty_flag) { | |
827 | debug("Requesting pty."); | |
828 | ||
829 | /* Start the packet. */ | |
830 | packet_start(SSH_CMSG_REQUEST_PTY); | |
831 | ||
832 | /* Store TERM in the packet. There is no limit on the | |
833 | length of the string. */ | |
834 | cp = getenv("TERM"); | |
835 | if (!cp) | |
836 | cp = ""; | |
837 | packet_put_string(cp, strlen(cp)); | |
838 | ||
839 | /* Store window size in the packet. */ | |
840 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) | |
841 | memset(&ws, 0, sizeof(ws)); | |
842 | packet_put_int(ws.ws_row); | |
843 | packet_put_int(ws.ws_col); | |
844 | packet_put_int(ws.ws_xpixel); | |
845 | packet_put_int(ws.ws_ypixel); | |
846 | ||
847 | /* Store tty modes in the packet. */ | |
848 | tty_make_modes(fileno(stdin)); | |
849 | ||
850 | /* Send the packet, and wait for it to leave. */ | |
851 | packet_send(); | |
852 | packet_write_wait(); | |
853 | ||
854 | /* Read response from the server. */ | |
855 | type = packet_read(&plen); | |
4fe2af09 | 856 | if (type == SSH_SMSG_SUCCESS) { |
5260325f | 857 | interactive = 1; |
8ce64345 | 858 | have_tty = 1; |
4fe2af09 | 859 | } else if (type == SSH_SMSG_FAILURE) |
5260325f | 860 | log("Warning: Remote host failed or refused to allocate a pseudo tty."); |
861 | else | |
862 | packet_disconnect("Protocol error waiting for pty request response."); | |
863 | } | |
864 | /* Request X11 forwarding if enabled and DISPLAY is set. */ | |
865 | if (options.forward_x11 && getenv("DISPLAY") != NULL) { | |
0b242b12 | 866 | char proto[512], data[512]; |
867 | /* Get reasonable local authentication information. */ | |
868 | x11_get_proto(proto, sizeof proto, data, sizeof data); | |
869 | /* Request forwarding with authentication spoofing. */ | |
5260325f | 870 | debug("Requesting X11 forwarding with authentication spoofing."); |
0b242b12 | 871 | x11_request_forwarding_with_spoofing(0, proto, data); |
5260325f | 872 | |
873 | /* Read response from the server. */ | |
874 | type = packet_read(&plen); | |
875 | if (type == SSH_SMSG_SUCCESS) { | |
5260325f | 876 | interactive = 1; |
0b242b12 | 877 | } else if (type == SSH_SMSG_FAILURE) { |
5260325f | 878 | log("Warning: Remote host denied X11 forwarding."); |
0b242b12 | 879 | } else { |
5260325f | 880 | packet_disconnect("Protocol error waiting for X11 forwarding"); |
0b242b12 | 881 | } |
5260325f | 882 | } |
883 | /* Tell the packet module whether this is an interactive session. */ | |
b5c334cc | 884 | packet_set_interactive(interactive); |
5260325f | 885 | |
886 | /* Request authentication agent forwarding if appropriate. */ | |
fa08c86b | 887 | check_agent_present(); |
888 | ||
5260325f | 889 | if (options.forward_agent) { |
890 | debug("Requesting authentication agent forwarding."); | |
891 | auth_request_forwarding(); | |
892 | ||
893 | /* Read response from the server. */ | |
894 | type = packet_read(&plen); | |
895 | packet_integrity_check(plen, 0, type); | |
896 | if (type != SSH_SMSG_SUCCESS) | |
897 | log("Warning: Remote host denied authentication agent forwarding."); | |
898 | } | |
8efc0c15 | 899 | |
fa08c86b | 900 | /* Initiate port forwardings. */ |
901 | ssh_init_forwarding(); | |
5260325f | 902 | |
aa3378df | 903 | /* If requested, let ssh continue in the background. */ |
6ae2364d | 904 | if (fork_after_authentication_flag) |
aa3378df | 905 | if (daemon(1, 1) < 0) |
906 | fatal("daemon() failed: %.200s", strerror(errno)); | |
907 | ||
908 | /* | |
909 | * If a command was specified on the command line, execute the | |
910 | * command now. Otherwise request the server to start a shell. | |
911 | */ | |
5260325f | 912 | if (buffer_len(&command) > 0) { |
913 | int len = buffer_len(&command); | |
914 | if (len > 900) | |
915 | len = 900; | |
916 | debug("Sending command: %.*s", len, buffer_ptr(&command)); | |
917 | packet_start(SSH_CMSG_EXEC_CMD); | |
918 | packet_put_string(buffer_ptr(&command), buffer_len(&command)); | |
919 | packet_send(); | |
920 | packet_write_wait(); | |
921 | } else { | |
922 | debug("Requesting shell."); | |
923 | packet_start(SSH_CMSG_EXEC_SHELL); | |
924 | packet_send(); | |
925 | packet_write_wait(); | |
926 | } | |
927 | ||
928 | /* Enter the interactive session. */ | |
2e73a022 | 929 | return client_loop(have_tty, tty_flag ? options.escape_char : -1, 0); |
8ce64345 | 930 | } |
5260325f | 931 | |
1f3bf5aa | 932 | void |
933 | client_subsystem_reply(int type, int plen, void *ctxt) | |
934 | { | |
935 | int id, len; | |
936 | ||
937 | id = packet_get_int(); | |
938 | len = buffer_len(&command); | |
939 | len = MAX(len, 900); | |
940 | packet_done(); | |
941 | if (type == SSH2_MSG_CHANNEL_FAILURE) | |
942 | fatal("Request for subsystem '%.*s' failed on channel %d", | |
943 | len, buffer_ptr(&command), id); | |
944 | } | |
945 | ||
8ce64345 | 946 | void |
fa08c86b | 947 | ssh_session2_callback(int id, void *arg) |
8ce64345 | 948 | { |
949 | int len; | |
b5c334cc | 950 | int interactive = 0; |
951 | ||
6a416424 | 952 | debug("client_init id %d arg %ld", id, (long)arg); |
8ce64345 | 953 | |
954 | if (no_shell_flag) | |
955 | goto done; | |
956 | ||
957 | if (tty_flag) { | |
958 | struct winsize ws; | |
959 | char *cp; | |
960 | cp = getenv("TERM"); | |
961 | if (!cp) | |
962 | cp = ""; | |
963 | /* Store window size in the packet. */ | |
964 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) | |
965 | memset(&ws, 0, sizeof(ws)); | |
966 | ||
967 | channel_request_start(id, "pty-req", 0); | |
968 | packet_put_cstring(cp); | |
969 | packet_put_int(ws.ws_col); | |
970 | packet_put_int(ws.ws_row); | |
971 | packet_put_int(ws.ws_xpixel); | |
972 | packet_put_int(ws.ws_ypixel); | |
973 | packet_put_cstring(""); /* XXX: encode terminal modes */ | |
974 | packet_send(); | |
b5c334cc | 975 | interactive = 1; |
8ce64345 | 976 | /* XXX wait for reply */ |
977 | } | |
0b242b12 | 978 | if (options.forward_x11 && |
979 | getenv("DISPLAY") != NULL) { | |
980 | char proto[512], data[512]; | |
981 | /* Get reasonable local authentication information. */ | |
982 | x11_get_proto(proto, sizeof proto, data, sizeof data); | |
983 | /* Request forwarding with authentication spoofing. */ | |
984 | debug("Requesting X11 forwarding with authentication spoofing."); | |
985 | x11_request_forwarding_with_spoofing(id, proto, data); | |
b5c334cc | 986 | interactive = 1; |
0b242b12 | 987 | /* XXX wait for reply */ |
988 | } | |
989 | ||
fa08c86b | 990 | check_agent_present(); |
991 | if (options.forward_agent) { | |
992 | debug("Requesting authentication agent forwarding."); | |
993 | channel_request_start(id, "auth-agent-req@openssh.com", 0); | |
994 | packet_send(); | |
995 | } | |
996 | ||
8ce64345 | 997 | len = buffer_len(&command); |
998 | if (len > 0) { | |
999 | if (len > 900) | |
1000 | len = 900; | |
ae810de7 | 1001 | if (subsystem_flag) { |
1002 | debug("Sending subsystem: %.*s", len, buffer_ptr(&command)); | |
1f3bf5aa | 1003 | channel_request_start(id, "subsystem", /*want reply*/ 1); |
1004 | /* register callback for reply */ | |
1005 | /* XXX we asume that client_loop has already been called */ | |
1006 | dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &client_subsystem_reply); | |
1007 | dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &client_subsystem_reply); | |
ae810de7 | 1008 | } else { |
1009 | debug("Sending command: %.*s", len, buffer_ptr(&command)); | |
1010 | channel_request_start(id, "exec", 0); | |
1011 | } | |
8ce64345 | 1012 | packet_put_string(buffer_ptr(&command), len); |
1013 | packet_send(); | |
1014 | } else { | |
1015 | channel_request(id, "shell", 0); | |
1016 | } | |
1017 | /* channel_callback(id, SSH2_MSG_OPEN_CONFIGMATION, client_init, 0); */ | |
1f3bf5aa | 1018 | |
8ce64345 | 1019 | done: |
1020 | /* register different callback, etc. XXX */ | |
b5c334cc | 1021 | packet_set_interactive(interactive); |
8ce64345 | 1022 | } |
1023 | ||
1024 | int | |
1025 | ssh_session2(void) | |
1026 | { | |
1027 | int window, packetmax, id; | |
2e73a022 | 1028 | int in, out, err; |
1029 | ||
14a9a859 | 1030 | if (stdin_null_flag) { |
5ca51e19 | 1031 | in = open(_PATH_DEVNULL, O_RDONLY); |
14a9a859 | 1032 | } else { |
1033 | in = dup(STDIN_FILENO); | |
1034 | } | |
2e73a022 | 1035 | out = dup(STDOUT_FILENO); |
1036 | err = dup(STDERR_FILENO); | |
8ce64345 | 1037 | |
1038 | if (in < 0 || out < 0 || err < 0) | |
14a9a859 | 1039 | fatal("dup() in/out/err failed"); |
8ce64345 | 1040 | |
a22aff1f | 1041 | /* enable nonblocking unless tty */ |
1042 | if (!isatty(in)) | |
1043 | set_nonblock(in); | |
1044 | if (!isatty(out)) | |
1045 | set_nonblock(out); | |
1046 | if (!isatty(err)) | |
1047 | set_nonblock(err); | |
1048 | ||
fa08c86b | 1049 | /* XXX should be pre-session */ |
1050 | ssh_init_forwarding(); | |
2b87da3b | 1051 | |
14a9a859 | 1052 | /* If requested, let ssh continue in the background. */ |
1053 | if (fork_after_authentication_flag) | |
1054 | if (daemon(1, 1) < 0) | |
1055 | fatal("daemon() failed: %.200s", strerror(errno)); | |
1056 | ||
bcbf86ec | 1057 | window = CHAN_SES_WINDOW_DEFAULT; |
1058 | packetmax = CHAN_SES_PACKET_DEFAULT; | |
1059 | if (!tty_flag) { | |
8ce64345 | 1060 | window *= 2; |
bcbf86ec | 1061 | packetmax *=2; |
8ce64345 | 1062 | } |
8ce64345 | 1063 | id = channel_new( |
1064 | "session", SSH_CHANNEL_OPENING, in, out, err, | |
bcbf86ec | 1065 | window, packetmax, CHAN_EXTENDED_WRITE, |
a22aff1f | 1066 | xstrdup("client-session"), /*nonblock*/0); |
8ce64345 | 1067 | |
8ce64345 | 1068 | channel_open(id); |
fa08c86b | 1069 | channel_register_callback(id, SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, |
1070 | ssh_session2_callback, (void *)0); | |
5260325f | 1071 | |
2e73a022 | 1072 | return client_loop(tty_flag, tty_flag ? options.escape_char : -1, id); |
8efc0c15 | 1073 | } |
fa08c86b | 1074 | |
1075 | int | |
1076 | guess_identity_file_type(const char *filename) | |
1077 | { | |
1078 | struct stat st; | |
1079 | Key *public; | |
1080 | int type = KEY_RSA1; /* default */ | |
1081 | ||
1082 | if (stat(filename, &st) < 0) { | |
d343d900 | 1083 | /* ignore this key */ |
fa08c86b | 1084 | return KEY_UNSPEC; |
1085 | } | |
1086 | public = key_new(type); | |
1087 | if (!load_public_key(filename, public, NULL)) { | |
1088 | /* ok, so we will assume this is 'some' key */ | |
1089 | type = KEY_UNSPEC; | |
1090 | } | |
1091 | key_free(public); | |
1092 | return type; | |
1093 | } |