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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" | |
aeaa3d9e | 42 | RCSID("$OpenBSD: ssh.c,v 1.105 2001/03/26 08:07:09 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 | /* Host private key. */ |
aeaa3d9e | 134 | Key *host_private_key = NULL; |
8efc0c15 | 135 | |
136 | /* Original real UID. */ | |
137 | uid_t original_real_uid; | |
138 | ||
8ce64345 | 139 | /* command to be executed */ |
140 | Buffer command; | |
141 | ||
ae810de7 | 142 | /* Should we execute a command or invoke a subsystem? */ |
143 | int subsystem_flag = 0; | |
144 | ||
8efc0c15 | 145 | /* Prints a help message to the user. This function never returns. */ |
146 | ||
147 | void | |
5ca51e19 | 148 | usage(void) |
8efc0c15 | 149 | { |
1fe6a48f | 150 | fprintf(stderr, "Usage: %s [options] host [command]\n", __progname); |
5260325f | 151 | fprintf(stderr, "Options:\n"); |
152 | fprintf(stderr, " -l user Log in using this user name.\n"); | |
5ca51e19 | 153 | fprintf(stderr, " -n Redirect input from " _PATH_DEVNULL ".\n"); |
71276795 | 154 | fprintf(stderr, " -A Enable authentication agent forwarding.\n"); |
5260325f | 155 | fprintf(stderr, " -a Disable authentication agent forwarding.\n"); |
8efc0c15 | 156 | #ifdef AFS |
5260325f | 157 | fprintf(stderr, " -k Disable Kerberos ticket and AFS token forwarding.\n"); |
158 | #endif /* AFS */ | |
2b87da3b | 159 | fprintf(stderr, " -X Enable X11 connection forwarding.\n"); |
5260325f | 160 | fprintf(stderr, " -x Disable X11 connection forwarding.\n"); |
a01a5f30 | 161 | fprintf(stderr, " -i file Identity for public key authentication " |
162 | "(default: ~/.ssh/identity)\n"); | |
5260325f | 163 | fprintf(stderr, " -t Tty; allocate a tty even if command is given.\n"); |
8ce64345 | 164 | fprintf(stderr, " -T Do not allocate a tty.\n"); |
5260325f | 165 | fprintf(stderr, " -v Verbose; display verbose debugging messages.\n"); |
bcbf86ec | 166 | fprintf(stderr, " Multiple -v increases verbosity.\n"); |
5260325f | 167 | fprintf(stderr, " -V Display version number only.\n"); |
168 | fprintf(stderr, " -P Don't allocate a privileged port.\n"); | |
169 | fprintf(stderr, " -q Quiet; don't display any warning messages.\n"); | |
170 | fprintf(stderr, " -f Fork into background after authentication.\n"); | |
171 | fprintf(stderr, " -e char Set escape character; ``none'' = disable (default: ~).\n"); | |
172 | ||
173 | fprintf(stderr, " -c cipher Select encryption algorithm: " | |
a01a5f30 | 174 | "``3des'', ``blowfish''\n"); |
38967add | 175 | fprintf(stderr, " -m macs Specify MAC algorithms for protocol version 2.\n"); |
5260325f | 176 | fprintf(stderr, " -p port Connect to this port. Server must be on the same port.\n"); |
177 | fprintf(stderr, " -L listen-port:host:port Forward local port to remote address\n"); | |
178 | fprintf(stderr, " -R listen-port:host:port Forward remote port to local address\n"); | |
1fe6a48f | 179 | fprintf(stderr, " These cause %s to listen for connections on a port, and\n", __progname); |
5260325f | 180 | fprintf(stderr, " forward them to the other side by connecting to host:port.\n"); |
181 | fprintf(stderr, " -C Enable compression.\n"); | |
8ce64345 | 182 | fprintf(stderr, " -N Do not execute a shell or command.\n"); |
5260325f | 183 | fprintf(stderr, " -g Allow remote hosts to connect to forwarded ports.\n"); |
1f3bf5aa | 184 | fprintf(stderr, " -1 Force protocol version 1.\n"); |
185 | fprintf(stderr, " -2 Force protocol version 2.\n"); | |
48e671d5 | 186 | fprintf(stderr, " -4 Use IPv4 only.\n"); |
187 | fprintf(stderr, " -6 Use IPv6 only.\n"); | |
5260325f | 188 | fprintf(stderr, " -o 'option' Process the option as if it was read from a configuration file.\n"); |
ae810de7 | 189 | fprintf(stderr, " -s Invoke command (mandatory) as SSH2 subsystem.\n"); |
5260325f | 190 | exit(1); |
8efc0c15 | 191 | } |
192 | ||
5260325f | 193 | /* |
194 | * Connects to the given host using rsh (or prints an error message and exits | |
195 | * if rsh is not available). This function never returns. | |
196 | */ | |
8efc0c15 | 197 | void |
5260325f | 198 | rsh_connect(char *host, char *user, Buffer * command) |
8efc0c15 | 199 | { |
5260325f | 200 | char *args[10]; |
201 | int i; | |
202 | ||
203 | log("Using rsh. WARNING: Connection will not be encrypted."); | |
204 | /* Build argument list for rsh. */ | |
205 | i = 0; | |
206 | args[i++] = _PATH_RSH; | |
207 | /* host may have to come after user on some systems */ | |
208 | args[i++] = host; | |
209 | if (user) { | |
210 | args[i++] = "-l"; | |
211 | args[i++] = user; | |
212 | } | |
213 | if (buffer_len(command) > 0) { | |
214 | buffer_append(command, "\0", 1); | |
215 | args[i++] = buffer_ptr(command); | |
216 | } | |
217 | args[i++] = NULL; | |
218 | if (debug_flag) { | |
219 | for (i = 0; args[i]; i++) { | |
220 | if (i != 0) | |
221 | fprintf(stderr, " "); | |
222 | fprintf(stderr, "%s", args[i]); | |
223 | } | |
224 | fprintf(stderr, "\n"); | |
8efc0c15 | 225 | } |
5260325f | 226 | execv(_PATH_RSH, args); |
227 | perror(_PATH_RSH); | |
228 | exit(1); | |
8efc0c15 | 229 | } |
230 | ||
fa08c86b | 231 | int ssh_session(void); |
232 | int ssh_session2(void); | |
fee56204 | 233 | void load_public_identity_files(void); |
8ce64345 | 234 | |
5260325f | 235 | /* |
236 | * Main program for the ssh client. | |
237 | */ | |
8efc0c15 | 238 | int |
239 | main(int ac, char **av) | |
240 | { | |
8ce64345 | 241 | int i, opt, optind, exit_status, ok; |
57112b5a | 242 | u_short fwd_port, fwd_host_port; |
5260325f | 243 | char *optarg, *cp, buf[256]; |
5260325f | 244 | struct stat st; |
3b1a83df | 245 | struct passwd *pw; |
8ce64345 | 246 | int dummy; |
5260325f | 247 | uid_t original_effective_uid; |
5260325f | 248 | |
260d427b | 249 | __progname = get_progname(av[0]); |
264dce47 | 250 | init_rng(); |
251 | ||
aa3378df | 252 | /* |
253 | * Save the original real uid. It will be needed later (uid-swapping | |
254 | * may clobber the real uid). | |
255 | */ | |
5260325f | 256 | original_real_uid = getuid(); |
257 | original_effective_uid = geteuid(); | |
258 | ||
7322ef0e | 259 | #ifdef HAVE_SETRLIMIT |
5260325f | 260 | /* If we are installed setuid root be careful to not drop core. */ |
261 | if (original_real_uid != original_effective_uid) { | |
262 | struct rlimit rlim; | |
263 | rlim.rlim_cur = rlim.rlim_max = 0; | |
264 | if (setrlimit(RLIMIT_CORE, &rlim) < 0) | |
265 | fatal("setrlimit failed: %.100s", strerror(errno)); | |
8efc0c15 | 266 | } |
3c62e7eb | 267 | #endif |
aa3378df | 268 | /* |
269 | * Use uid-swapping to give up root privileges for the duration of | |
270 | * option processing. We will re-instantiate the rights when we are | |
271 | * ready to create the privileged port, and will permanently drop | |
272 | * them when the port has been created (actually, when the connection | |
273 | * has been made, as we may need to create the port several times). | |
274 | */ | |
5260325f | 275 | temporarily_use_uid(original_real_uid); |
276 | ||
aa3378df | 277 | /* |
278 | * Set our umask to something reasonable, as some files are created | |
279 | * with the default umask. This will make them world-readable but | |
280 | * writable only by the owner, which is ok for all files for which we | |
281 | * don't set the modes explicitly. | |
282 | */ | |
5260325f | 283 | umask(022); |
284 | ||
5260325f | 285 | /* Initialize option structure to indicate that no values have been set. */ |
286 | initialize_options(&options); | |
287 | ||
288 | /* Parse command-line arguments. */ | |
289 | host = NULL; | |
290 | ||
5260325f | 291 | for (optind = 1; optind < ac; optind++) { |
292 | if (av[optind][0] != '-') { | |
293 | if (host) | |
294 | break; | |
295 | if ((cp = strchr(av[optind], '@'))) { | |
6ae2364d | 296 | if(cp == av[optind]) |
297 | usage(); | |
5260325f | 298 | options.user = av[optind]; |
299 | *cp = '\0'; | |
300 | host = ++cp; | |
301 | } else | |
302 | host = av[optind]; | |
303 | continue; | |
304 | } | |
305 | opt = av[optind][1]; | |
306 | if (!opt) | |
307 | usage(); | |
b2552997 | 308 | if (strchr("eilcmpLRo", opt)) { /* options with arguments */ |
5260325f | 309 | optarg = av[optind] + 2; |
310 | if (strcmp(optarg, "") == 0) { | |
311 | if (optind >= ac - 1) | |
312 | usage(); | |
313 | optarg = av[++optind]; | |
314 | } | |
315 | } else { | |
316 | if (av[optind][2]) | |
317 | usage(); | |
318 | optarg = NULL; | |
319 | } | |
320 | switch (opt) { | |
1f3bf5aa | 321 | case '1': |
322 | options.protocol = SSH_PROTO_1; | |
323 | break; | |
6ae2364d | 324 | case '2': |
325 | options.protocol = SSH_PROTO_2; | |
326 | break; | |
48e671d5 | 327 | case '4': |
328 | IPv4or6 = AF_INET; | |
329 | break; | |
48e671d5 | 330 | case '6': |
331 | IPv4or6 = AF_INET6; | |
332 | break; | |
5260325f | 333 | case 'n': |
334 | stdin_null_flag = 1; | |
335 | break; | |
5260325f | 336 | case 'f': |
337 | fork_after_authentication_flag = 1; | |
338 | stdin_null_flag = 1; | |
339 | break; | |
5260325f | 340 | case 'x': |
341 | options.forward_x11 = 0; | |
342 | break; | |
5260325f | 343 | case 'X': |
344 | options.forward_x11 = 1; | |
345 | break; | |
5260325f | 346 | case 'g': |
347 | options.gateway_ports = 1; | |
348 | break; | |
5260325f | 349 | case 'P': |
350 | options.use_privileged_port = 0; | |
351 | break; | |
5260325f | 352 | case 'a': |
353 | options.forward_agent = 0; | |
354 | break; | |
71276795 | 355 | case 'A': |
356 | options.forward_agent = 1; | |
357 | break; | |
5260325f | 358 | #ifdef AFS |
359 | case 'k': | |
360 | options.kerberos_tgt_passing = 0; | |
361 | options.afs_token_passing = 0; | |
362 | break; | |
363 | #endif | |
364 | case 'i': | |
365 | if (stat(optarg, &st) < 0) { | |
366 | fprintf(stderr, "Warning: Identity file %s does not exist.\n", | |
fa08c86b | 367 | optarg); |
5260325f | 368 | break; |
369 | } | |
370 | if (options.num_identity_files >= SSH_MAX_IDENTITY_FILES) | |
371 | fatal("Too many identity files specified (max %d)", | |
fa08c86b | 372 | SSH_MAX_IDENTITY_FILES); |
373 | options.identity_files[options.num_identity_files++] = xstrdup(optarg); | |
5260325f | 374 | break; |
5260325f | 375 | case 't': |
8abcdba4 | 376 | if (tty_flag) |
377 | force_tty_flag = 1; | |
5260325f | 378 | tty_flag = 1; |
379 | break; | |
5260325f | 380 | case 'v': |
bcbf86ec | 381 | if (0 == debug_flag) { |
382 | debug_flag = 1; | |
383 | options.log_level = SYSLOG_LEVEL_DEBUG1; | |
384 | } else if (options.log_level < SYSLOG_LEVEL_DEBUG3) { | |
385 | options.log_level++; | |
386 | break; | |
387 | } else { | |
54b974dc | 388 | fatal("Too high debugging level."); |
bcbf86ec | 389 | } |
390 | /* fallthrough */ | |
5260325f | 391 | case 'V': |
e68225b2 | 392 | fprintf(stderr, |
393 | "%s, SSH protocols %d.%d/%d.%d, OpenSSL 0x%8.8lx\n", | |
a8be9f80 | 394 | SSH_VERSION, |
395 | PROTOCOL_MAJOR_1, PROTOCOL_MINOR_1, | |
e68225b2 | 396 | PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2, |
397 | SSLeay()); | |
5260325f | 398 | if (opt == 'V') |
399 | exit(0); | |
5260325f | 400 | break; |
5260325f | 401 | case 'q': |
402 | options.log_level = SYSLOG_LEVEL_QUIET; | |
403 | break; | |
5260325f | 404 | case 'e': |
405 | if (optarg[0] == '^' && optarg[2] == 0 && | |
1e3b8b07 | 406 | (u_char) optarg[1] >= 64 && (u_char) optarg[1] < 128) |
407 | options.escape_char = (u_char) optarg[1] & 31; | |
5260325f | 408 | else if (strlen(optarg) == 1) |
1e3b8b07 | 409 | options.escape_char = (u_char) optarg[0]; |
5260325f | 410 | else if (strcmp(optarg, "none") == 0) |
411 | options.escape_char = -2; | |
412 | else { | |
413 | fprintf(stderr, "Bad escape character '%s'.\n", optarg); | |
414 | exit(1); | |
415 | } | |
416 | break; | |
5260325f | 417 | case 'c': |
a306f2dd | 418 | if (ciphers_valid(optarg)) { |
419 | /* SSH2 only */ | |
420 | options.ciphers = xstrdup(optarg); | |
d0c832f3 | 421 | options.cipher = SSH_CIPHER_ILLEGAL; |
a306f2dd | 422 | } else { |
423 | /* SSH1 only */ | |
c523303b | 424 | options.cipher = cipher_number(optarg); |
425 | if (options.cipher == -1) { | |
a306f2dd | 426 | fprintf(stderr, "Unknown cipher type '%s'\n", optarg); |
427 | exit(1); | |
428 | } | |
c523303b | 429 | if (options.cipher == SSH_CIPHER_3DES) { |
430 | options.ciphers = "3des-cbc"; | |
431 | } else if (options.cipher == SSH_CIPHER_BLOWFISH) { | |
432 | options.ciphers = "blowfish-cbc"; | |
433 | } else { | |
434 | options.ciphers = (char *)-1; | |
435 | } | |
5260325f | 436 | } |
437 | break; | |
b2552997 | 438 | case 'm': |
439 | if (mac_valid(optarg)) | |
440 | options.macs = xstrdup(optarg); | |
441 | else { | |
442 | fprintf(stderr, "Unknown mac type '%s'\n", optarg); | |
443 | exit(1); | |
444 | } | |
445 | break; | |
5260325f | 446 | case 'p': |
447 | options.port = atoi(optarg); | |
5260325f | 448 | break; |
5260325f | 449 | case 'l': |
450 | options.user = optarg; | |
451 | break; | |
5260325f | 452 | case 'R': |
48e671d5 | 453 | if (sscanf(optarg, "%hu/%255[^/]/%hu", &fwd_port, buf, |
454 | &fwd_host_port) != 3 && | |
455 | sscanf(optarg, "%hu:%255[^:]:%hu", &fwd_port, buf, | |
456 | &fwd_host_port) != 3) { | |
5260325f | 457 | fprintf(stderr, "Bad forwarding specification '%s'.\n", optarg); |
458 | usage(); | |
459 | /* NOTREACHED */ | |
460 | } | |
461 | add_remote_forward(&options, fwd_port, buf, fwd_host_port); | |
462 | break; | |
5260325f | 463 | case 'L': |
48e671d5 | 464 | if (sscanf(optarg, "%hu/%255[^/]/%hu", &fwd_port, buf, |
465 | &fwd_host_port) != 3 && | |
466 | sscanf(optarg, "%hu:%255[^:]:%hu", &fwd_port, buf, | |
467 | &fwd_host_port) != 3) { | |
5260325f | 468 | fprintf(stderr, "Bad forwarding specification '%s'.\n", optarg); |
469 | usage(); | |
470 | /* NOTREACHED */ | |
471 | } | |
472 | add_local_forward(&options, fwd_port, buf, fwd_host_port); | |
473 | break; | |
5260325f | 474 | case 'C': |
475 | options.compression = 1; | |
476 | break; | |
8ce64345 | 477 | case 'N': |
478 | no_shell_flag = 1; | |
479 | no_tty_flag = 1; | |
480 | break; | |
8ce64345 | 481 | case 'T': |
482 | no_tty_flag = 1; | |
483 | break; | |
5260325f | 484 | case 'o': |
485 | dummy = 1; | |
486 | if (process_config_line(&options, host ? host : "", optarg, | |
487 | "command-line", 0, &dummy) != 0) | |
488 | exit(1); | |
489 | break; | |
ae810de7 | 490 | case 's': |
491 | subsystem_flag = 1; | |
492 | break; | |
5260325f | 493 | default: |
494 | usage(); | |
495 | } | |
496 | } | |
497 | ||
498 | /* Check that we got a host name. */ | |
499 | if (!host) | |
8efc0c15 | 500 | usage(); |
5260325f | 501 | |
22d89d24 | 502 | SSLeay_add_all_algorithms(); |
fa08c86b | 503 | ERR_load_crypto_strings(); |
22d89d24 | 504 | |
5260325f | 505 | /* Initialize the command to execute on remote host. */ |
506 | buffer_init(&command); | |
507 | ||
aa3378df | 508 | /* |
509 | * Save the command to execute on the remote host in a buffer. There | |
510 | * is no limit on the length of the command, except by the maximum | |
511 | * packet size. Also sets the tty flag if there is no command. | |
512 | */ | |
5260325f | 513 | if (optind == ac) { |
514 | /* No command specified - execute shell on a tty. */ | |
515 | tty_flag = 1; | |
ae810de7 | 516 | if (subsystem_flag) { |
517 | fprintf(stderr, "You must specify a subsystem to invoke."); | |
518 | usage(); | |
519 | } | |
5260325f | 520 | } else { |
521 | /* A command has been specified. Store it into the | |
522 | buffer. */ | |
523 | for (i = optind; i < ac; i++) { | |
524 | if (i > optind) | |
525 | buffer_append(&command, " ", 1); | |
526 | buffer_append(&command, av[i], strlen(av[i])); | |
527 | } | |
8efc0c15 | 528 | } |
5260325f | 529 | |
530 | /* Cannot fork to background if no command. */ | |
14a9a859 | 531 | if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag) |
5260325f | 532 | fatal("Cannot fork into background without a command to execute."); |
533 | ||
534 | /* Allocate a tty by default if no command specified. */ | |
535 | if (buffer_len(&command) == 0) | |
536 | tty_flag = 1; | |
537 | ||
0b6fbf03 | 538 | /* Force no tty*/ |
539 | if (no_tty_flag) | |
540 | tty_flag = 0; | |
5260325f | 541 | /* Do not allocate a tty if stdin is not a tty. */ |
8abcdba4 | 542 | if (!isatty(fileno(stdin)) && !force_tty_flag) { |
5260325f | 543 | if (tty_flag) |
54b974dc | 544 | log("Pseudo-terminal will not be allocated because stdin is not a terminal."); |
5260325f | 545 | tty_flag = 0; |
546 | } | |
8ce64345 | 547 | |
5260325f | 548 | /* Get user data. */ |
549 | pw = getpwuid(original_real_uid); | |
550 | if (!pw) { | |
54b974dc | 551 | log("You don't exist, go away!"); |
5260325f | 552 | exit(1); |
553 | } | |
554 | /* Take a copy of the returned structure. */ | |
3b1a83df | 555 | pw = pwcopy(pw); |
5260325f | 556 | |
20244695 | 557 | /* |
558 | * Initialize "log" output. Since we are the client all output | |
559 | * actually goes to stderr. | |
560 | */ | |
561 | log_init(av[0], SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_USER, 1); | |
5260325f | 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 */ | |
20244695 | 574 | log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 1); |
5260325f | 575 | |
e339aa53 | 576 | seed_rng(); |
577 | ||
5260325f | 578 | if (options.user == NULL) |
579 | options.user = xstrdup(pw->pw_name); | |
580 | ||
581 | if (options.hostname != NULL) | |
582 | host = options.hostname; | |
583 | ||
5260325f | 584 | /* Disable rhosts authentication if not running as root. */ |
3c62e7eb | 585 | #ifdef HAVE_CYGWIN |
586 | /* Ignore uid if running under Windows */ | |
587 | if (!options.use_privileged_port) { | |
588 | #else | |
5260325f | 589 | if (original_effective_uid != 0 || !options.use_privileged_port) { |
3c62e7eb | 590 | #endif |
6ffc9c88 | 591 | debug("Rhosts Authentication disabled, " |
592 | "originating port will not be trusted."); | |
5260325f | 593 | options.rhosts_authentication = 0; |
5260325f | 594 | } |
aa3378df | 595 | /* |
596 | * If using rsh has been selected, exec it now (without trying | |
597 | * anything else). Note that we must release privileges first. | |
598 | */ | |
5260325f | 599 | if (options.use_rsh) { |
aa3378df | 600 | /* |
601 | * Restore our superuser privileges. This must be done | |
602 | * before permanently setting the uid. | |
603 | */ | |
5260325f | 604 | restore_uid(); |
605 | ||
606 | /* Switch to the original uid permanently. */ | |
607 | permanently_set_uid(original_real_uid); | |
608 | ||
609 | /* Execute rsh. */ | |
610 | rsh_connect(host, options.user, &command); | |
611 | fatal("rsh_connect returned"); | |
8efc0c15 | 612 | } |
5260325f | 613 | /* Restore our superuser privileges. */ |
614 | restore_uid(); | |
615 | ||
6ffc9c88 | 616 | /* Open a connection to the remote host. */ |
5260325f | 617 | |
618 | ok = ssh_connect(host, &hostaddr, options.port, | |
6ffc9c88 | 619 | options.connection_attempts, |
620 | original_effective_uid != 0 || !options.use_privileged_port, | |
621 | original_real_uid, | |
622 | options.proxy_command); | |
5260325f | 623 | |
aa3378df | 624 | /* |
625 | * If we successfully made the connection, load the host private key | |
626 | * in case we will need it later for combined rsa-rhosts | |
627 | * authentication. This must be done before releasing extra | |
628 | * privileges, because the file is only readable by root. | |
629 | */ | |
a306f2dd | 630 | if (ok && (options.protocol & SSH_PROTO_1)) { |
aeaa3d9e | 631 | host_private_key = key_load_private_type(KEY_RSA1, |
632 | _PATH_HOST_KEY_FILE, "", NULL); | |
5260325f | 633 | } |
aa3378df | 634 | /* |
635 | * Get rid of any extra privileges that we may have. We will no | |
636 | * longer need them. Also, extra privileges could make it very hard | |
637 | * to read identity files and other non-world-readable files from the | |
638 | * user's home directory if it happens to be on a NFS volume where | |
639 | * root is mapped to nobody. | |
640 | */ | |
641 | ||
642 | /* | |
643 | * Note that some legacy systems need to postpone the following call | |
644 | * to permanently_set_uid() until the private hostkey is destroyed | |
645 | * with RSA_free(). Otherwise the calling user could ptrace() the | |
646 | * process, read the private hostkey and impersonate the host. | |
647 | * OpenBSD does not allow ptracing of setuid processes. | |
648 | */ | |
5260325f | 649 | permanently_set_uid(original_real_uid); |
650 | ||
aa3378df | 651 | /* |
652 | * Now that we are back to our own permissions, create ~/.ssh | |
653 | * directory if it doesn\'t already exist. | |
654 | */ | |
42f11eb2 | 655 | snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, _PATH_SSH_USER_DIR); |
5260325f | 656 | if (stat(buf, &st) < 0) |
704b1659 | 657 | if (mkdir(buf, 0700) < 0) |
5260325f | 658 | error("Could not create directory '%.200s'.", buf); |
659 | ||
660 | /* Check if the connection failed, and try "rsh" if appropriate. */ | |
661 | if (!ok) { | |
662 | if (options.port != 0) | |
57112b5a | 663 | log("Secure connection to %.100s on port %hu refused%.100s.", |
5260325f | 664 | host, options.port, |
665 | options.fallback_to_rsh ? "; reverting to insecure method" : ""); | |
666 | else | |
667 | log("Secure connection to %.100s refused%.100s.", host, | |
668 | options.fallback_to_rsh ? "; reverting to insecure method" : ""); | |
669 | ||
670 | if (options.fallback_to_rsh) { | |
671 | rsh_connect(host, options.user, &command); | |
672 | fatal("rsh_connect returned"); | |
673 | } | |
674 | exit(1); | |
8efc0c15 | 675 | } |
fee56204 | 676 | /* load options.identity_files */ |
677 | load_public_identity_files(); | |
678 | ||
679 | /* Expand ~ in known host file names. */ | |
680 | /* XXX mem-leaks: */ | |
fa08c86b | 681 | options.system_hostfile = |
682 | tilde_expand_filename(options.system_hostfile, original_real_uid); | |
683 | options.user_hostfile = | |
684 | tilde_expand_filename(options.user_hostfile, original_real_uid); | |
685 | options.system_hostfile2 = | |
686 | tilde_expand_filename(options.system_hostfile2, original_real_uid); | |
687 | options.user_hostfile2 = | |
688 | tilde_expand_filename(options.user_hostfile2, original_real_uid); | |
5260325f | 689 | |
690 | /* Log into the remote system. This never returns if the login fails. */ | |
aeaa3d9e | 691 | ssh_login(host_private_key, host, (struct sockaddr *)&hostaddr, |
692 | original_real_uid); | |
5260325f | 693 | |
694 | /* We no longer need the host private key. Clear it now. */ | |
aeaa3d9e | 695 | if (host_private_key != NULL) |
696 | key_free(host_private_key); /* Destroys contents safely */ | |
5260325f | 697 | |
8ce64345 | 698 | exit_status = compat20 ? ssh_session2() : ssh_session(); |
699 | packet_close(); | |
700 | return exit_status; | |
701 | } | |
702 | ||
0b242b12 | 703 | void |
704 | x11_get_proto(char *proto, int proto_len, char *data, int data_len) | |
705 | { | |
706 | char line[512]; | |
707 | FILE *f; | |
708 | int got_data = 0, i; | |
709 | ||
fa649821 | 710 | if (options.xauth_location) { |
711 | /* Try to get Xauthority information for the display. */ | |
5ca51e19 | 712 | snprintf(line, sizeof line, "%.100s list %.200s 2>" _PATH_DEVNULL, |
fa649821 | 713 | options.xauth_location, getenv("DISPLAY")); |
714 | f = popen(line, "r"); | |
715 | if (f && fgets(line, sizeof(line), f) && | |
716 | sscanf(line, "%*s %s %s", proto, data) == 2) | |
717 | got_data = 1; | |
718 | if (f) | |
719 | pclose(f); | |
720 | } | |
0b242b12 | 721 | /* |
722 | * If we didn't get authentication data, just make up some | |
723 | * data. The forwarding code will check the validity of the | |
724 | * response anyway, and substitute this data. The X11 | |
725 | * server, however, will ignore this fake data and use | |
726 | * whatever authentication mechanisms it was using otherwise | |
727 | * for the local connection. | |
728 | */ | |
729 | if (!got_data) { | |
730 | u_int32_t rand = 0; | |
731 | ||
732 | strlcpy(proto, "MIT-MAGIC-COOKIE-1", proto_len); | |
733 | for (i = 0; i < 16; i++) { | |
734 | if (i % 4 == 0) | |
735 | rand = arc4random(); | |
736 | snprintf(data + 2 * i, data_len - 2 * i, "%02x", rand & 0xff); | |
737 | rand >>= 8; | |
738 | } | |
739 | } | |
740 | } | |
741 | ||
fa08c86b | 742 | void |
743 | ssh_init_forwarding(void) | |
744 | { | |
02a024dd | 745 | int success = 0; |
fa08c86b | 746 | int i; |
02a024dd | 747 | |
fa08c86b | 748 | /* Initiate local TCP/IP port forwardings. */ |
749 | for (i = 0; i < options.num_local_forwards; i++) { | |
750 | debug("Connections to local port %d forwarded to remote address %.200s:%d", | |
751 | options.local_forwards[i].port, | |
752 | options.local_forwards[i].host, | |
753 | options.local_forwards[i].host_port); | |
02a024dd | 754 | success += channel_request_local_forwarding( |
fa08c86b | 755 | options.local_forwards[i].port, |
756 | options.local_forwards[i].host, | |
757 | options.local_forwards[i].host_port, | |
758 | options.gateway_ports); | |
759 | } | |
02a024dd | 760 | if (i > 0 && success == 0) |
761 | error("Could not request local forwarding."); | |
fa08c86b | 762 | |
763 | /* Initiate remote TCP/IP port forwardings. */ | |
764 | for (i = 0; i < options.num_remote_forwards; i++) { | |
765 | debug("Connections to remote port %d forwarded to local address %.200s:%d", | |
766 | options.remote_forwards[i].port, | |
767 | options.remote_forwards[i].host, | |
768 | options.remote_forwards[i].host_port); | |
769 | channel_request_remote_forwarding( | |
770 | options.remote_forwards[i].port, | |
771 | options.remote_forwards[i].host, | |
772 | options.remote_forwards[i].host_port); | |
773 | } | |
774 | } | |
775 | ||
776 | void | |
777 | check_agent_present(void) | |
778 | { | |
779 | if (options.forward_agent) { | |
780 | /* Clear agent forwarding if we don\'t have an agent. */ | |
781 | int authfd = ssh_get_authentication_socket(); | |
782 | if (authfd < 0) | |
783 | options.forward_agent = 0; | |
784 | else | |
785 | ssh_close_authentication_socket(authfd); | |
786 | } | |
787 | } | |
788 | ||
8ce64345 | 789 | int |
790 | ssh_session(void) | |
791 | { | |
792 | int type; | |
8ce64345 | 793 | int plen; |
794 | int interactive = 0; | |
795 | int have_tty = 0; | |
796 | struct winsize ws; | |
8ce64345 | 797 | char *cp; |
798 | ||
5260325f | 799 | /* Enable compression if requested. */ |
800 | if (options.compression) { | |
801 | debug("Requesting compression at level %d.", options.compression_level); | |
802 | ||
803 | if (options.compression_level < 1 || options.compression_level > 9) | |
804 | fatal("Compression level must be from 1 (fast) to 9 (slow, best)."); | |
805 | ||
806 | /* Send the request. */ | |
807 | packet_start(SSH_CMSG_REQUEST_COMPRESSION); | |
808 | packet_put_int(options.compression_level); | |
809 | packet_send(); | |
810 | packet_write_wait(); | |
811 | type = packet_read(&plen); | |
812 | if (type == SSH_SMSG_SUCCESS) | |
813 | packet_start_compression(options.compression_level); | |
814 | else if (type == SSH_SMSG_FAILURE) | |
815 | log("Warning: Remote host refused compression."); | |
816 | else | |
817 | packet_disconnect("Protocol error waiting for compression response."); | |
818 | } | |
819 | /* Allocate a pseudo tty if appropriate. */ | |
820 | if (tty_flag) { | |
821 | debug("Requesting pty."); | |
822 | ||
823 | /* Start the packet. */ | |
824 | packet_start(SSH_CMSG_REQUEST_PTY); | |
825 | ||
826 | /* Store TERM in the packet. There is no limit on the | |
827 | length of the string. */ | |
828 | cp = getenv("TERM"); | |
829 | if (!cp) | |
830 | cp = ""; | |
831 | packet_put_string(cp, strlen(cp)); | |
832 | ||
833 | /* Store window size in the packet. */ | |
834 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) | |
835 | memset(&ws, 0, sizeof(ws)); | |
836 | packet_put_int(ws.ws_row); | |
837 | packet_put_int(ws.ws_col); | |
838 | packet_put_int(ws.ws_xpixel); | |
839 | packet_put_int(ws.ws_ypixel); | |
840 | ||
841 | /* Store tty modes in the packet. */ | |
842 | tty_make_modes(fileno(stdin)); | |
843 | ||
844 | /* Send the packet, and wait for it to leave. */ | |
845 | packet_send(); | |
846 | packet_write_wait(); | |
847 | ||
848 | /* Read response from the server. */ | |
849 | type = packet_read(&plen); | |
4fe2af09 | 850 | if (type == SSH_SMSG_SUCCESS) { |
5260325f | 851 | interactive = 1; |
8ce64345 | 852 | have_tty = 1; |
4fe2af09 | 853 | } else if (type == SSH_SMSG_FAILURE) |
5260325f | 854 | log("Warning: Remote host failed or refused to allocate a pseudo tty."); |
855 | else | |
856 | packet_disconnect("Protocol error waiting for pty request response."); | |
857 | } | |
858 | /* Request X11 forwarding if enabled and DISPLAY is set. */ | |
859 | if (options.forward_x11 && getenv("DISPLAY") != NULL) { | |
0b242b12 | 860 | char proto[512], data[512]; |
861 | /* Get reasonable local authentication information. */ | |
862 | x11_get_proto(proto, sizeof proto, data, sizeof data); | |
863 | /* Request forwarding with authentication spoofing. */ | |
5260325f | 864 | debug("Requesting X11 forwarding with authentication spoofing."); |
0b242b12 | 865 | x11_request_forwarding_with_spoofing(0, proto, data); |
5260325f | 866 | |
867 | /* Read response from the server. */ | |
868 | type = packet_read(&plen); | |
869 | if (type == SSH_SMSG_SUCCESS) { | |
5260325f | 870 | interactive = 1; |
0b242b12 | 871 | } else if (type == SSH_SMSG_FAILURE) { |
5260325f | 872 | log("Warning: Remote host denied X11 forwarding."); |
0b242b12 | 873 | } else { |
5260325f | 874 | packet_disconnect("Protocol error waiting for X11 forwarding"); |
0b242b12 | 875 | } |
5260325f | 876 | } |
877 | /* Tell the packet module whether this is an interactive session. */ | |
b5c334cc | 878 | packet_set_interactive(interactive); |
5260325f | 879 | |
880 | /* Request authentication agent forwarding if appropriate. */ | |
fa08c86b | 881 | check_agent_present(); |
882 | ||
5260325f | 883 | if (options.forward_agent) { |
884 | debug("Requesting authentication agent forwarding."); | |
885 | auth_request_forwarding(); | |
886 | ||
887 | /* Read response from the server. */ | |
888 | type = packet_read(&plen); | |
889 | packet_integrity_check(plen, 0, type); | |
890 | if (type != SSH_SMSG_SUCCESS) | |
891 | log("Warning: Remote host denied authentication agent forwarding."); | |
892 | } | |
8efc0c15 | 893 | |
fa08c86b | 894 | /* Initiate port forwardings. */ |
895 | ssh_init_forwarding(); | |
5260325f | 896 | |
aa3378df | 897 | /* If requested, let ssh continue in the background. */ |
6ae2364d | 898 | if (fork_after_authentication_flag) |
aa3378df | 899 | if (daemon(1, 1) < 0) |
900 | fatal("daemon() failed: %.200s", strerror(errno)); | |
901 | ||
902 | /* | |
903 | * If a command was specified on the command line, execute the | |
904 | * command now. Otherwise request the server to start a shell. | |
905 | */ | |
5260325f | 906 | if (buffer_len(&command) > 0) { |
907 | int len = buffer_len(&command); | |
908 | if (len > 900) | |
909 | len = 900; | |
910 | debug("Sending command: %.*s", len, buffer_ptr(&command)); | |
911 | packet_start(SSH_CMSG_EXEC_CMD); | |
912 | packet_put_string(buffer_ptr(&command), buffer_len(&command)); | |
913 | packet_send(); | |
914 | packet_write_wait(); | |
915 | } else { | |
916 | debug("Requesting shell."); | |
917 | packet_start(SSH_CMSG_EXEC_SHELL); | |
918 | packet_send(); | |
919 | packet_write_wait(); | |
920 | } | |
921 | ||
922 | /* Enter the interactive session. */ | |
2e73a022 | 923 | return client_loop(have_tty, tty_flag ? options.escape_char : -1, 0); |
8ce64345 | 924 | } |
5260325f | 925 | |
1f3bf5aa | 926 | void |
927 | client_subsystem_reply(int type, int plen, void *ctxt) | |
928 | { | |
929 | int id, len; | |
930 | ||
931 | id = packet_get_int(); | |
932 | len = buffer_len(&command); | |
ce91d6f8 | 933 | if (len > 900) |
934 | len = 900; | |
1f3bf5aa | 935 | packet_done(); |
936 | if (type == SSH2_MSG_CHANNEL_FAILURE) | |
937 | fatal("Request for subsystem '%.*s' failed on channel %d", | |
938 | len, buffer_ptr(&command), id); | |
939 | } | |
940 | ||
8ce64345 | 941 | void |
fa08c86b | 942 | ssh_session2_callback(int id, void *arg) |
8ce64345 | 943 | { |
944 | int len; | |
b5c334cc | 945 | int interactive = 0; |
946 | ||
6a416424 | 947 | debug("client_init id %d arg %ld", id, (long)arg); |
8ce64345 | 948 | |
949 | if (no_shell_flag) | |
950 | goto done; | |
951 | ||
952 | if (tty_flag) { | |
953 | struct winsize ws; | |
954 | char *cp; | |
955 | cp = getenv("TERM"); | |
956 | if (!cp) | |
957 | cp = ""; | |
958 | /* Store window size in the packet. */ | |
959 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) | |
960 | memset(&ws, 0, sizeof(ws)); | |
961 | ||
962 | channel_request_start(id, "pty-req", 0); | |
963 | packet_put_cstring(cp); | |
964 | packet_put_int(ws.ws_col); | |
965 | packet_put_int(ws.ws_row); | |
966 | packet_put_int(ws.ws_xpixel); | |
967 | packet_put_int(ws.ws_ypixel); | |
968 | packet_put_cstring(""); /* XXX: encode terminal modes */ | |
969 | packet_send(); | |
b5c334cc | 970 | interactive = 1; |
8ce64345 | 971 | /* XXX wait for reply */ |
972 | } | |
0b242b12 | 973 | if (options.forward_x11 && |
974 | getenv("DISPLAY") != NULL) { | |
975 | char proto[512], data[512]; | |
976 | /* Get reasonable local authentication information. */ | |
977 | x11_get_proto(proto, sizeof proto, data, sizeof data); | |
978 | /* Request forwarding with authentication spoofing. */ | |
979 | debug("Requesting X11 forwarding with authentication spoofing."); | |
980 | x11_request_forwarding_with_spoofing(id, proto, data); | |
b5c334cc | 981 | interactive = 1; |
0b242b12 | 982 | /* XXX wait for reply */ |
983 | } | |
984 | ||
fa08c86b | 985 | check_agent_present(); |
986 | if (options.forward_agent) { | |
987 | debug("Requesting authentication agent forwarding."); | |
988 | channel_request_start(id, "auth-agent-req@openssh.com", 0); | |
989 | packet_send(); | |
990 | } | |
991 | ||
8ce64345 | 992 | len = buffer_len(&command); |
993 | if (len > 0) { | |
994 | if (len > 900) | |
995 | len = 900; | |
ae810de7 | 996 | if (subsystem_flag) { |
997 | debug("Sending subsystem: %.*s", len, buffer_ptr(&command)); | |
1f3bf5aa | 998 | channel_request_start(id, "subsystem", /*want reply*/ 1); |
999 | /* register callback for reply */ | |
1000 | /* XXX we asume that client_loop has already been called */ | |
1001 | dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &client_subsystem_reply); | |
1002 | dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &client_subsystem_reply); | |
ae810de7 | 1003 | } else { |
1004 | debug("Sending command: %.*s", len, buffer_ptr(&command)); | |
1005 | channel_request_start(id, "exec", 0); | |
1006 | } | |
ce91d6f8 | 1007 | packet_put_string(buffer_ptr(&command), buffer_len(&command)); |
8ce64345 | 1008 | packet_send(); |
1009 | } else { | |
1010 | channel_request(id, "shell", 0); | |
1011 | } | |
1012 | /* channel_callback(id, SSH2_MSG_OPEN_CONFIGMATION, client_init, 0); */ | |
1f3bf5aa | 1013 | |
8ce64345 | 1014 | done: |
1015 | /* register different callback, etc. XXX */ | |
b5c334cc | 1016 | packet_set_interactive(interactive); |
8ce64345 | 1017 | } |
1018 | ||
1019 | int | |
1020 | ssh_session2(void) | |
1021 | { | |
1022 | int window, packetmax, id; | |
2e73a022 | 1023 | int in, out, err; |
1024 | ||
14a9a859 | 1025 | if (stdin_null_flag) { |
5ca51e19 | 1026 | in = open(_PATH_DEVNULL, O_RDONLY); |
14a9a859 | 1027 | } else { |
1028 | in = dup(STDIN_FILENO); | |
1029 | } | |
2e73a022 | 1030 | out = dup(STDOUT_FILENO); |
1031 | err = dup(STDERR_FILENO); | |
8ce64345 | 1032 | |
1033 | if (in < 0 || out < 0 || err < 0) | |
14a9a859 | 1034 | fatal("dup() in/out/err failed"); |
8ce64345 | 1035 | |
a22aff1f | 1036 | /* enable nonblocking unless tty */ |
1037 | if (!isatty(in)) | |
1038 | set_nonblock(in); | |
1039 | if (!isatty(out)) | |
1040 | set_nonblock(out); | |
1041 | if (!isatty(err)) | |
1042 | set_nonblock(err); | |
1043 | ||
fa08c86b | 1044 | /* XXX should be pre-session */ |
1045 | ssh_init_forwarding(); | |
2b87da3b | 1046 | |
14a9a859 | 1047 | /* If requested, let ssh continue in the background. */ |
1048 | if (fork_after_authentication_flag) | |
1049 | if (daemon(1, 1) < 0) | |
1050 | fatal("daemon() failed: %.200s", strerror(errno)); | |
1051 | ||
bcbf86ec | 1052 | window = CHAN_SES_WINDOW_DEFAULT; |
1053 | packetmax = CHAN_SES_PACKET_DEFAULT; | |
1054 | if (!tty_flag) { | |
8ce64345 | 1055 | window *= 2; |
bcbf86ec | 1056 | packetmax *=2; |
8ce64345 | 1057 | } |
8ce64345 | 1058 | id = channel_new( |
1059 | "session", SSH_CHANNEL_OPENING, in, out, err, | |
bcbf86ec | 1060 | window, packetmax, CHAN_EXTENDED_WRITE, |
a22aff1f | 1061 | xstrdup("client-session"), /*nonblock*/0); |
8ce64345 | 1062 | |
8ce64345 | 1063 | channel_open(id); |
fa08c86b | 1064 | channel_register_callback(id, SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, |
1065 | ssh_session2_callback, (void *)0); | |
5260325f | 1066 | |
2e73a022 | 1067 | return client_loop(tty_flag, tty_flag ? options.escape_char : -1, id); |
8efc0c15 | 1068 | } |
fa08c86b | 1069 | |
fee56204 | 1070 | void |
1071 | load_public_identity_files(void) | |
1072 | { | |
1073 | char *filename; | |
1074 | Key *public; | |
1075 | int i; | |
1076 | ||
1077 | for (i = 0; i < options.num_identity_files; i++) { | |
1078 | filename = tilde_expand_filename(options.identity_files[i], | |
1079 | original_real_uid); | |
aeaa3d9e | 1080 | public = key_load_public(filename, NULL); |
fee56204 | 1081 | debug("identity file %s type %d", filename, |
1082 | public ? public->type : -1); | |
1083 | xfree(options.identity_files[i]); | |
1084 | options.identity_files[i] = filename; | |
1085 | options.identity_keys[i] = public; | |
1086 | } | |
1087 | } |