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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" | |
42f11eb2 | 42 | RCSID("$OpenBSD: ssh.c,v 1.84 2001/01/21 19:05:58 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" | |
66 | #include "misc.h" | |
8efc0c15 | 67 | |
f601d847 | 68 | #ifdef HAVE___PROGNAME |
69 | extern char *__progname; | |
260d427b | 70 | #else |
71 | char *__progname; | |
72 | #endif | |
f601d847 | 73 | |
48e671d5 | 74 | /* Flag indicating whether IPv4 or IPv6. This can be set on the command line. |
75 | Default value is AF_UNSPEC means both IPv4 and IPv6. */ | |
59e76f33 | 76 | #ifdef IPV4_DEFAULT |
77 | int IPv4or6 = AF_INET; | |
78 | #else | |
48e671d5 | 79 | int IPv4or6 = AF_UNSPEC; |
59e76f33 | 80 | #endif |
48e671d5 | 81 | |
5260325f | 82 | /* Flag indicating whether debug mode is on. This can be set on the command line. */ |
8efc0c15 | 83 | int debug_flag = 0; |
84 | ||
a8be9f80 | 85 | /* Flag indicating whether a tty should be allocated */ |
8efc0c15 | 86 | int tty_flag = 0; |
8abcdba4 | 87 | int no_tty_flag = 0; |
88 | int force_tty_flag = 0; | |
8efc0c15 | 89 | |
8ce64345 | 90 | /* don't exec a shell */ |
91 | int no_shell_flag = 0; | |
8ce64345 | 92 | |
aa3378df | 93 | /* |
94 | * Flag indicating that nothing should be read from stdin. This can be set | |
95 | * on the command line. | |
96 | */ | |
8efc0c15 | 97 | int stdin_null_flag = 0; |
98 | ||
aa3378df | 99 | /* |
100 | * Flag indicating that ssh should fork after authentication. This is useful | |
101 | * so that the pasphrase can be entered manually, and then ssh goes to the | |
102 | * background. | |
103 | */ | |
8efc0c15 | 104 | int fork_after_authentication_flag = 0; |
105 | ||
aa3378df | 106 | /* |
107 | * General data structure for command line options and options configurable | |
108 | * in configuration files. See readconf.h. | |
109 | */ | |
8efc0c15 | 110 | Options options; |
111 | ||
aa3378df | 112 | /* |
113 | * Name of the host we are connecting to. This is the name given on the | |
114 | * command line, or the HostName specified for the user-supplied name in a | |
115 | * configuration file. | |
116 | */ | |
8efc0c15 | 117 | char *host; |
118 | ||
119 | /* socket address the host resolves to */ | |
48e671d5 | 120 | struct sockaddr_storage hostaddr; |
8efc0c15 | 121 | |
aa3378df | 122 | /* |
123 | * Flag to indicate that we have received a window change signal which has | |
124 | * not yet been processed. This will cause a message indicating the new | |
125 | * window size to be sent to the server a little later. This is volatile | |
126 | * because this is updated in a signal handler. | |
127 | */ | |
8efc0c15 | 128 | volatile int received_window_change_signal = 0; |
129 | ||
8efc0c15 | 130 | /* Flag indicating whether we have a valid host private key loaded. */ |
131 | int host_private_key_loaded = 0; | |
132 | ||
133 | /* Host private key. */ | |
134 | RSA *host_private_key = NULL; | |
135 | ||
136 | /* Original real UID. */ | |
137 | uid_t original_real_uid; | |
138 | ||
8ce64345 | 139 | /* command to be executed */ |
140 | Buffer command; | |
141 | ||
8efc0c15 | 142 | /* Prints a help message to the user. This function never returns. */ |
143 | ||
144 | void | |
145 | usage() | |
146 | { | |
1fe6a48f | 147 | fprintf(stderr, "Usage: %s [options] host [command]\n", __progname); |
5260325f | 148 | fprintf(stderr, "Options:\n"); |
149 | fprintf(stderr, " -l user Log in using this user name.\n"); | |
150 | fprintf(stderr, " -n Redirect input from /dev/null.\n"); | |
71276795 | 151 | fprintf(stderr, " -A Enable authentication agent forwarding.\n"); |
5260325f | 152 | fprintf(stderr, " -a Disable authentication agent forwarding.\n"); |
8efc0c15 | 153 | #ifdef AFS |
5260325f | 154 | fprintf(stderr, " -k Disable Kerberos ticket and AFS token forwarding.\n"); |
155 | #endif /* AFS */ | |
0e73cc53 | 156 | fprintf(stderr, " -X Enable X11 connection forwarding.\n"); |
5260325f | 157 | fprintf(stderr, " -x Disable X11 connection forwarding.\n"); |
158 | fprintf(stderr, " -i file Identity for RSA authentication (default: ~/.ssh/identity).\n"); | |
159 | fprintf(stderr, " -t Tty; allocate a tty even if command is given.\n"); | |
8ce64345 | 160 | fprintf(stderr, " -T Do not allocate a tty.\n"); |
5260325f | 161 | fprintf(stderr, " -v Verbose; display verbose debugging messages.\n"); |
bcbf86ec | 162 | fprintf(stderr, " Multiple -v increases verbosity.\n"); |
5260325f | 163 | fprintf(stderr, " -V Display version number only.\n"); |
164 | fprintf(stderr, " -P Don't allocate a privileged port.\n"); | |
165 | fprintf(stderr, " -q Quiet; don't display any warning messages.\n"); | |
166 | fprintf(stderr, " -f Fork into background after authentication.\n"); | |
167 | fprintf(stderr, " -e char Set escape character; ``none'' = disable (default: ~).\n"); | |
168 | ||
169 | fprintf(stderr, " -c cipher Select encryption algorithm: " | |
170 | "``3des'', " | |
171 | "``blowfish''\n"); | |
172 | fprintf(stderr, " -p port Connect to this port. Server must be on the same port.\n"); | |
173 | fprintf(stderr, " -L listen-port:host:port Forward local port to remote address\n"); | |
174 | fprintf(stderr, " -R listen-port:host:port Forward remote port to local address\n"); | |
1fe6a48f | 175 | fprintf(stderr, " These cause %s to listen for connections on a port, and\n", __progname); |
5260325f | 176 | fprintf(stderr, " forward them to the other side by connecting to host:port.\n"); |
177 | fprintf(stderr, " -C Enable compression.\n"); | |
8ce64345 | 178 | fprintf(stderr, " -N Do not execute a shell or command.\n"); |
5260325f | 179 | fprintf(stderr, " -g Allow remote hosts to connect to forwarded ports.\n"); |
48e671d5 | 180 | fprintf(stderr, " -4 Use IPv4 only.\n"); |
181 | fprintf(stderr, " -6 Use IPv6 only.\n"); | |
6ae2364d | 182 | fprintf(stderr, " -2 Force protocol version 2.\n"); |
5260325f | 183 | fprintf(stderr, " -o 'option' Process the option as if it was read from a configuration file.\n"); |
184 | exit(1); | |
8efc0c15 | 185 | } |
186 | ||
5260325f | 187 | /* |
188 | * Connects to the given host using rsh (or prints an error message and exits | |
189 | * if rsh is not available). This function never returns. | |
190 | */ | |
8efc0c15 | 191 | void |
5260325f | 192 | rsh_connect(char *host, char *user, Buffer * command) |
8efc0c15 | 193 | { |
5260325f | 194 | char *args[10]; |
195 | int i; | |
196 | ||
197 | log("Using rsh. WARNING: Connection will not be encrypted."); | |
198 | /* Build argument list for rsh. */ | |
199 | i = 0; | |
200 | args[i++] = _PATH_RSH; | |
201 | /* host may have to come after user on some systems */ | |
202 | args[i++] = host; | |
203 | if (user) { | |
204 | args[i++] = "-l"; | |
205 | args[i++] = user; | |
206 | } | |
207 | if (buffer_len(command) > 0) { | |
208 | buffer_append(command, "\0", 1); | |
209 | args[i++] = buffer_ptr(command); | |
210 | } | |
211 | args[i++] = NULL; | |
212 | if (debug_flag) { | |
213 | for (i = 0; args[i]; i++) { | |
214 | if (i != 0) | |
215 | fprintf(stderr, " "); | |
216 | fprintf(stderr, "%s", args[i]); | |
217 | } | |
218 | fprintf(stderr, "\n"); | |
8efc0c15 | 219 | } |
5260325f | 220 | execv(_PATH_RSH, args); |
221 | perror(_PATH_RSH); | |
222 | exit(1); | |
8efc0c15 | 223 | } |
224 | ||
fa08c86b | 225 | int ssh_session(void); |
226 | int ssh_session2(void); | |
227 | int guess_identity_file_type(const char *filename); | |
8ce64345 | 228 | |
5260325f | 229 | /* |
230 | * Main program for the ssh client. | |
231 | */ | |
8efc0c15 | 232 | int |
233 | main(int ac, char **av) | |
234 | { | |
8ce64345 | 235 | int i, opt, optind, exit_status, ok; |
57112b5a | 236 | u_short fwd_port, fwd_host_port; |
5260325f | 237 | char *optarg, *cp, buf[256]; |
5260325f | 238 | struct stat st; |
239 | struct passwd *pw, pwcopy; | |
8ce64345 | 240 | int dummy; |
5260325f | 241 | uid_t original_effective_uid; |
5260325f | 242 | |
260d427b | 243 | __progname = get_progname(av[0]); |
264dce47 | 244 | init_rng(); |
245 | ||
aa3378df | 246 | /* |
247 | * Save the original real uid. It will be needed later (uid-swapping | |
248 | * may clobber the real uid). | |
249 | */ | |
5260325f | 250 | original_real_uid = getuid(); |
251 | original_effective_uid = geteuid(); | |
252 | ||
7322ef0e | 253 | #ifdef HAVE_SETRLIMIT |
5260325f | 254 | /* If we are installed setuid root be careful to not drop core. */ |
255 | if (original_real_uid != original_effective_uid) { | |
256 | struct rlimit rlim; | |
257 | rlim.rlim_cur = rlim.rlim_max = 0; | |
258 | if (setrlimit(RLIMIT_CORE, &rlim) < 0) | |
259 | fatal("setrlimit failed: %.100s", strerror(errno)); | |
8efc0c15 | 260 | } |
3c62e7eb | 261 | #endif |
aa3378df | 262 | /* |
263 | * Use uid-swapping to give up root privileges for the duration of | |
264 | * option processing. We will re-instantiate the rights when we are | |
265 | * ready to create the privileged port, and will permanently drop | |
266 | * them when the port has been created (actually, when the connection | |
267 | * has been made, as we may need to create the port several times). | |
268 | */ | |
5260325f | 269 | temporarily_use_uid(original_real_uid); |
270 | ||
aa3378df | 271 | /* |
272 | * Set our umask to something reasonable, as some files are created | |
273 | * with the default umask. This will make them world-readable but | |
274 | * writable only by the owner, which is ok for all files for which we | |
275 | * don't set the modes explicitly. | |
276 | */ | |
5260325f | 277 | umask(022); |
278 | ||
5260325f | 279 | /* Initialize option structure to indicate that no values have been set. */ |
280 | initialize_options(&options); | |
281 | ||
282 | /* Parse command-line arguments. */ | |
283 | host = NULL; | |
284 | ||
285 | /* If program name is not one of the standard names, use it as host name. */ | |
1fe6a48f | 286 | cp = __progname; |
3c62e7eb | 287 | #ifdef HAVE_CYGWIN |
288 | if (strcasecmp(cp, "rsh") && strcasecmp(cp, "ssh") && | |
289 | strcasecmp(cp, "rlogin") && strcasecmp(cp, "slogin") && | |
290 | strcasecmp(cp, "remsh") && | |
291 | strcasecmp(cp, "rsh.exe") && strcasecmp(cp, "ssh.exe") && | |
292 | strcasecmp(cp, "rlogin.exe") && strcasecmp(cp, "slogin.exe") && | |
293 | strcasecmp(cp, "remsh.exe")) | |
294 | #else | |
2e73a022 | 295 | if (strcmp(cp, "rsh") && strcmp(cp, "ssh") && strcmp(cp, "rlogin") && |
296 | strcmp(cp, "slogin") && strcmp(cp, "remsh")) | |
3c62e7eb | 297 | #endif |
5260325f | 298 | host = cp; |
299 | ||
300 | for (optind = 1; optind < ac; optind++) { | |
301 | if (av[optind][0] != '-') { | |
302 | if (host) | |
303 | break; | |
304 | if ((cp = strchr(av[optind], '@'))) { | |
6ae2364d | 305 | if(cp == av[optind]) |
306 | usage(); | |
5260325f | 307 | options.user = av[optind]; |
308 | *cp = '\0'; | |
309 | host = ++cp; | |
310 | } else | |
311 | host = av[optind]; | |
312 | continue; | |
313 | } | |
314 | opt = av[optind][1]; | |
315 | if (!opt) | |
316 | usage(); | |
317 | if (strchr("eilcpLRo", opt)) { /* options with arguments */ | |
318 | optarg = av[optind] + 2; | |
319 | if (strcmp(optarg, "") == 0) { | |
320 | if (optind >= ac - 1) | |
321 | usage(); | |
322 | optarg = av[++optind]; | |
323 | } | |
324 | } else { | |
325 | if (av[optind][2]) | |
326 | usage(); | |
327 | optarg = NULL; | |
328 | } | |
329 | switch (opt) { | |
6ae2364d | 330 | case '2': |
331 | options.protocol = SSH_PROTO_2; | |
332 | break; | |
48e671d5 | 333 | case '4': |
334 | IPv4or6 = AF_INET; | |
335 | break; | |
48e671d5 | 336 | case '6': |
337 | IPv4or6 = AF_INET6; | |
338 | break; | |
5260325f | 339 | case 'n': |
340 | stdin_null_flag = 1; | |
341 | break; | |
5260325f | 342 | case 'f': |
343 | fork_after_authentication_flag = 1; | |
344 | stdin_null_flag = 1; | |
345 | break; | |
5260325f | 346 | case 'x': |
347 | options.forward_x11 = 0; | |
348 | break; | |
5260325f | 349 | case 'X': |
350 | options.forward_x11 = 1; | |
351 | break; | |
5260325f | 352 | case 'g': |
353 | options.gateway_ports = 1; | |
354 | break; | |
5260325f | 355 | case 'P': |
356 | options.use_privileged_port = 0; | |
357 | break; | |
5260325f | 358 | case 'a': |
359 | options.forward_agent = 0; | |
360 | break; | |
71276795 | 361 | case 'A': |
362 | options.forward_agent = 1; | |
363 | break; | |
5260325f | 364 | #ifdef AFS |
365 | case 'k': | |
366 | options.kerberos_tgt_passing = 0; | |
367 | options.afs_token_passing = 0; | |
368 | break; | |
369 | #endif | |
370 | case 'i': | |
371 | if (stat(optarg, &st) < 0) { | |
372 | fprintf(stderr, "Warning: Identity file %s does not exist.\n", | |
fa08c86b | 373 | optarg); |
5260325f | 374 | break; |
375 | } | |
376 | if (options.num_identity_files >= SSH_MAX_IDENTITY_FILES) | |
377 | fatal("Too many identity files specified (max %d)", | |
fa08c86b | 378 | SSH_MAX_IDENTITY_FILES); |
379 | options.identity_files[options.num_identity_files++] = xstrdup(optarg); | |
5260325f | 380 | break; |
5260325f | 381 | case 't': |
8abcdba4 | 382 | if (tty_flag) |
383 | force_tty_flag = 1; | |
5260325f | 384 | tty_flag = 1; |
385 | break; | |
5260325f | 386 | case 'v': |
bcbf86ec | 387 | if (0 == debug_flag) { |
388 | debug_flag = 1; | |
389 | options.log_level = SYSLOG_LEVEL_DEBUG1; | |
390 | } else if (options.log_level < SYSLOG_LEVEL_DEBUG3) { | |
391 | options.log_level++; | |
392 | break; | |
393 | } else { | |
394 | fatal("Too high debugging level.\n"); | |
395 | } | |
396 | /* fallthrough */ | |
5260325f | 397 | case 'V': |
a8be9f80 | 398 | fprintf(stderr, "SSH Version %s, protocol versions %d.%d/%d.%d.\n", |
399 | SSH_VERSION, | |
400 | PROTOCOL_MAJOR_1, PROTOCOL_MINOR_1, | |
401 | PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2); | |
8ce64345 | 402 | fprintf(stderr, "Compiled with SSL (0x%8.8lx).\n", SSLeay()); |
5260325f | 403 | if (opt == 'V') |
404 | exit(0); | |
5260325f | 405 | break; |
5260325f | 406 | case 'q': |
407 | options.log_level = SYSLOG_LEVEL_QUIET; | |
408 | break; | |
5260325f | 409 | case 'e': |
410 | if (optarg[0] == '^' && optarg[2] == 0 && | |
1e3b8b07 | 411 | (u_char) optarg[1] >= 64 && (u_char) optarg[1] < 128) |
412 | options.escape_char = (u_char) optarg[1] & 31; | |
5260325f | 413 | else if (strlen(optarg) == 1) |
1e3b8b07 | 414 | options.escape_char = (u_char) optarg[0]; |
5260325f | 415 | else if (strcmp(optarg, "none") == 0) |
416 | options.escape_char = -2; | |
417 | else { | |
418 | fprintf(stderr, "Bad escape character '%s'.\n", optarg); | |
419 | exit(1); | |
420 | } | |
421 | break; | |
5260325f | 422 | case 'c': |
a306f2dd | 423 | if (ciphers_valid(optarg)) { |
424 | /* SSH2 only */ | |
425 | options.ciphers = xstrdup(optarg); | |
d0c832f3 | 426 | options.cipher = SSH_CIPHER_ILLEGAL; |
a306f2dd | 427 | } else { |
428 | /* SSH1 only */ | |
c523303b | 429 | options.cipher = cipher_number(optarg); |
430 | if (options.cipher == -1) { | |
a306f2dd | 431 | fprintf(stderr, "Unknown cipher type '%s'\n", optarg); |
432 | exit(1); | |
433 | } | |
c523303b | 434 | if (options.cipher == SSH_CIPHER_3DES) { |
435 | options.ciphers = "3des-cbc"; | |
436 | } else if (options.cipher == SSH_CIPHER_BLOWFISH) { | |
437 | options.ciphers = "blowfish-cbc"; | |
438 | } else { | |
439 | options.ciphers = (char *)-1; | |
440 | } | |
5260325f | 441 | } |
442 | break; | |
5260325f | 443 | case 'p': |
444 | options.port = atoi(optarg); | |
5260325f | 445 | break; |
5260325f | 446 | case 'l': |
447 | options.user = optarg; | |
448 | break; | |
5260325f | 449 | case 'R': |
48e671d5 | 450 | if (sscanf(optarg, "%hu/%255[^/]/%hu", &fwd_port, buf, |
451 | &fwd_host_port) != 3 && | |
452 | sscanf(optarg, "%hu:%255[^:]:%hu", &fwd_port, buf, | |
453 | &fwd_host_port) != 3) { | |
5260325f | 454 | fprintf(stderr, "Bad forwarding specification '%s'.\n", optarg); |
455 | usage(); | |
456 | /* NOTREACHED */ | |
457 | } | |
458 | add_remote_forward(&options, fwd_port, buf, fwd_host_port); | |
459 | break; | |
5260325f | 460 | case 'L': |
48e671d5 | 461 | if (sscanf(optarg, "%hu/%255[^/]/%hu", &fwd_port, buf, |
462 | &fwd_host_port) != 3 && | |
463 | sscanf(optarg, "%hu:%255[^:]:%hu", &fwd_port, buf, | |
464 | &fwd_host_port) != 3) { | |
5260325f | 465 | fprintf(stderr, "Bad forwarding specification '%s'.\n", optarg); |
466 | usage(); | |
467 | /* NOTREACHED */ | |
468 | } | |
469 | add_local_forward(&options, fwd_port, buf, fwd_host_port); | |
470 | break; | |
5260325f | 471 | case 'C': |
472 | options.compression = 1; | |
473 | break; | |
8ce64345 | 474 | case 'N': |
475 | no_shell_flag = 1; | |
476 | no_tty_flag = 1; | |
477 | break; | |
8ce64345 | 478 | case 'T': |
479 | no_tty_flag = 1; | |
480 | break; | |
5260325f | 481 | case 'o': |
482 | dummy = 1; | |
483 | if (process_config_line(&options, host ? host : "", optarg, | |
484 | "command-line", 0, &dummy) != 0) | |
485 | exit(1); | |
486 | break; | |
5260325f | 487 | default: |
488 | usage(); | |
489 | } | |
490 | } | |
491 | ||
492 | /* Check that we got a host name. */ | |
493 | if (!host) | |
8efc0c15 | 494 | usage(); |
5260325f | 495 | |
22d89d24 | 496 | SSLeay_add_all_algorithms(); |
fa08c86b | 497 | ERR_load_crypto_strings(); |
22d89d24 | 498 | |
5260325f | 499 | /* Initialize the command to execute on remote host. */ |
500 | buffer_init(&command); | |
501 | ||
aa3378df | 502 | /* |
503 | * Save the command to execute on the remote host in a buffer. There | |
504 | * is no limit on the length of the command, except by the maximum | |
505 | * packet size. Also sets the tty flag if there is no command. | |
506 | */ | |
5260325f | 507 | if (optind == ac) { |
508 | /* No command specified - execute shell on a tty. */ | |
509 | tty_flag = 1; | |
510 | } else { | |
511 | /* A command has been specified. Store it into the | |
512 | buffer. */ | |
513 | for (i = optind; i < ac; i++) { | |
514 | if (i > optind) | |
515 | buffer_append(&command, " ", 1); | |
516 | buffer_append(&command, av[i], strlen(av[i])); | |
517 | } | |
8efc0c15 | 518 | } |
5260325f | 519 | |
520 | /* Cannot fork to background if no command. */ | |
14a9a859 | 521 | if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag) |
5260325f | 522 | fatal("Cannot fork into background without a command to execute."); |
523 | ||
524 | /* Allocate a tty by default if no command specified. */ | |
525 | if (buffer_len(&command) == 0) | |
526 | tty_flag = 1; | |
527 | ||
0b6fbf03 | 528 | /* Force no tty*/ |
529 | if (no_tty_flag) | |
530 | tty_flag = 0; | |
5260325f | 531 | /* Do not allocate a tty if stdin is not a tty. */ |
8abcdba4 | 532 | if (!isatty(fileno(stdin)) && !force_tty_flag) { |
5260325f | 533 | if (tty_flag) |
b5c334cc | 534 | log("Pseudo-terminal will not be allocated because stdin is not a terminal.\n"); |
5260325f | 535 | tty_flag = 0; |
536 | } | |
8ce64345 | 537 | |
5260325f | 538 | /* Get user data. */ |
539 | pw = getpwuid(original_real_uid); | |
540 | if (!pw) { | |
b5c334cc | 541 | log("You don't exist, go away!\n"); |
5260325f | 542 | exit(1); |
543 | } | |
544 | /* Take a copy of the returned structure. */ | |
545 | memset(&pwcopy, 0, sizeof(pwcopy)); | |
546 | pwcopy.pw_name = xstrdup(pw->pw_name); | |
547 | pwcopy.pw_passwd = xstrdup(pw->pw_passwd); | |
548 | pwcopy.pw_uid = pw->pw_uid; | |
549 | pwcopy.pw_gid = pw->pw_gid; | |
2e73a022 | 550 | #ifdef HAVE_PW_CLASS_IN_PASSWD |
551 | pwcopy.pw_class = xstrdup(pw->pw_class); | |
552 | #endif | |
5260325f | 553 | pwcopy.pw_dir = xstrdup(pw->pw_dir); |
554 | pwcopy.pw_shell = xstrdup(pw->pw_shell); | |
555 | pw = &pwcopy; | |
556 | ||
557 | /* Initialize "log" output. Since we are the client all output | |
558 | actually goes to the terminal. */ | |
559 | log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 0); | |
560 | ||
561 | /* Read per-user configuration file. */ | |
42f11eb2 | 562 | snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, _PATH_SSH_USER_CONFFILE); |
5260325f | 563 | read_config_file(buf, host, &options); |
564 | ||
565 | /* Read systemwide configuration file. */ | |
42f11eb2 | 566 | read_config_file(_PATH_HOST_CONFIG_FILE, host, &options); |
5260325f | 567 | |
568 | /* Fill configuration defaults. */ | |
569 | fill_default_options(&options); | |
570 | ||
571 | /* reinit */ | |
572 | log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 0); | |
573 | ||
574 | if (options.user == NULL) | |
575 | options.user = xstrdup(pw->pw_name); | |
576 | ||
577 | if (options.hostname != NULL) | |
578 | host = options.hostname; | |
579 | ||
5260325f | 580 | /* Disable rhosts authentication if not running as root. */ |
3c62e7eb | 581 | #ifdef HAVE_CYGWIN |
582 | /* Ignore uid if running under Windows */ | |
583 | if (!options.use_privileged_port) { | |
584 | #else | |
5260325f | 585 | if (original_effective_uid != 0 || !options.use_privileged_port) { |
3c62e7eb | 586 | #endif |
6ffc9c88 | 587 | debug("Rhosts Authentication disabled, " |
588 | "originating port will not be trusted."); | |
5260325f | 589 | options.rhosts_authentication = 0; |
5260325f | 590 | } |
aa3378df | 591 | /* |
592 | * If using rsh has been selected, exec it now (without trying | |
593 | * anything else). Note that we must release privileges first. | |
594 | */ | |
5260325f | 595 | if (options.use_rsh) { |
aa3378df | 596 | /* |
597 | * Restore our superuser privileges. This must be done | |
598 | * before permanently setting the uid. | |
599 | */ | |
5260325f | 600 | restore_uid(); |
601 | ||
602 | /* Switch to the original uid permanently. */ | |
603 | permanently_set_uid(original_real_uid); | |
604 | ||
605 | /* Execute rsh. */ | |
606 | rsh_connect(host, options.user, &command); | |
607 | fatal("rsh_connect returned"); | |
8efc0c15 | 608 | } |
5260325f | 609 | /* Restore our superuser privileges. */ |
610 | restore_uid(); | |
611 | ||
6ffc9c88 | 612 | /* Open a connection to the remote host. */ |
5260325f | 613 | |
614 | ok = ssh_connect(host, &hostaddr, options.port, | |
6ffc9c88 | 615 | options.connection_attempts, |
616 | original_effective_uid != 0 || !options.use_privileged_port, | |
617 | original_real_uid, | |
618 | options.proxy_command); | |
5260325f | 619 | |
aa3378df | 620 | /* |
621 | * If we successfully made the connection, load the host private key | |
622 | * in case we will need it later for combined rsa-rhosts | |
623 | * authentication. This must be done before releasing extra | |
624 | * privileges, because the file is only readable by root. | |
625 | */ | |
a306f2dd | 626 | if (ok && (options.protocol & SSH_PROTO_1)) { |
627 | Key k; | |
5260325f | 628 | host_private_key = RSA_new(); |
fa08c86b | 629 | k.type = KEY_RSA1; |
a306f2dd | 630 | k.rsa = host_private_key; |
42f11eb2 | 631 | if (load_private_key(_PATH_HOST_KEY_FILE, "", &k, NULL)) |
5260325f | 632 | host_private_key_loaded = 1; |
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 | } |
fa08c86b | 676 | /* Expand ~ in options.identity_files, known host file names. */ |
a306f2dd | 677 | /* XXX mem-leaks */ |
fa08c86b | 678 | for (i = 0; i < options.num_identity_files; i++) { |
5260325f | 679 | options.identity_files[i] = |
fa08c86b | 680 | tilde_expand_filename(options.identity_files[i], original_real_uid); |
681 | options.identity_files_type[i] = guess_identity_file_type(options.identity_files[i]); | |
682 | debug("identity file %s type %d", options.identity_files[i], | |
683 | options.identity_files_type[i]); | |
684 | } | |
685 | options.system_hostfile = | |
686 | tilde_expand_filename(options.system_hostfile, original_real_uid); | |
687 | options.user_hostfile = | |
688 | tilde_expand_filename(options.user_hostfile, original_real_uid); | |
689 | options.system_hostfile2 = | |
690 | tilde_expand_filename(options.system_hostfile2, original_real_uid); | |
691 | options.user_hostfile2 = | |
692 | tilde_expand_filename(options.user_hostfile2, original_real_uid); | |
5260325f | 693 | |
694 | /* Log into the remote system. This never returns if the login fails. */ | |
695 | ssh_login(host_private_key_loaded, host_private_key, | |
48e671d5 | 696 | host, (struct sockaddr *)&hostaddr, original_real_uid); |
5260325f | 697 | |
698 | /* We no longer need the host private key. Clear it now. */ | |
699 | if (host_private_key_loaded) | |
700 | RSA_free(host_private_key); /* Destroys contents safely */ | |
701 | ||
8ce64345 | 702 | exit_status = compat20 ? ssh_session2() : ssh_session(); |
703 | packet_close(); | |
704 | return exit_status; | |
705 | } | |
706 | ||
0b242b12 | 707 | void |
708 | x11_get_proto(char *proto, int proto_len, char *data, int data_len) | |
709 | { | |
710 | char line[512]; | |
711 | FILE *f; | |
712 | int got_data = 0, i; | |
713 | ||
fa649821 | 714 | if (options.xauth_location) { |
715 | /* Try to get Xauthority information for the display. */ | |
716 | snprintf(line, sizeof line, "%.100s list %.200s 2>/dev/null", | |
717 | options.xauth_location, getenv("DISPLAY")); | |
718 | f = popen(line, "r"); | |
719 | if (f && fgets(line, sizeof(line), f) && | |
720 | sscanf(line, "%*s %s %s", proto, data) == 2) | |
721 | got_data = 1; | |
722 | if (f) | |
723 | pclose(f); | |
724 | } | |
0b242b12 | 725 | /* |
726 | * If we didn't get authentication data, just make up some | |
727 | * data. The forwarding code will check the validity of the | |
728 | * response anyway, and substitute this data. The X11 | |
729 | * server, however, will ignore this fake data and use | |
730 | * whatever authentication mechanisms it was using otherwise | |
731 | * for the local connection. | |
732 | */ | |
733 | if (!got_data) { | |
734 | u_int32_t rand = 0; | |
735 | ||
736 | strlcpy(proto, "MIT-MAGIC-COOKIE-1", proto_len); | |
737 | for (i = 0; i < 16; i++) { | |
738 | if (i % 4 == 0) | |
739 | rand = arc4random(); | |
740 | snprintf(data + 2 * i, data_len - 2 * i, "%02x", rand & 0xff); | |
741 | rand >>= 8; | |
742 | } | |
743 | } | |
744 | } | |
745 | ||
fa08c86b | 746 | void |
747 | ssh_init_forwarding(void) | |
748 | { | |
749 | int i; | |
750 | /* Initiate local TCP/IP port forwardings. */ | |
751 | for (i = 0; i < options.num_local_forwards; i++) { | |
752 | debug("Connections to local port %d forwarded to remote address %.200s:%d", | |
753 | options.local_forwards[i].port, | |
754 | options.local_forwards[i].host, | |
755 | options.local_forwards[i].host_port); | |
756 | channel_request_local_forwarding( | |
757 | options.local_forwards[i].port, | |
758 | options.local_forwards[i].host, | |
759 | options.local_forwards[i].host_port, | |
760 | options.gateway_ports); | |
761 | } | |
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 | |
8ce64345 | 926 | void |
fa08c86b | 927 | ssh_session2_callback(int id, void *arg) |
8ce64345 | 928 | { |
929 | int len; | |
b5c334cc | 930 | int interactive = 0; |
931 | ||
8ce64345 | 932 | debug("client_init id %d arg %d", id, (int)arg); |
933 | ||
934 | if (no_shell_flag) | |
935 | goto done; | |
936 | ||
937 | if (tty_flag) { | |
938 | struct winsize ws; | |
939 | char *cp; | |
940 | cp = getenv("TERM"); | |
941 | if (!cp) | |
942 | cp = ""; | |
943 | /* Store window size in the packet. */ | |
944 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) | |
945 | memset(&ws, 0, sizeof(ws)); | |
946 | ||
947 | channel_request_start(id, "pty-req", 0); | |
948 | packet_put_cstring(cp); | |
949 | packet_put_int(ws.ws_col); | |
950 | packet_put_int(ws.ws_row); | |
951 | packet_put_int(ws.ws_xpixel); | |
952 | packet_put_int(ws.ws_ypixel); | |
953 | packet_put_cstring(""); /* XXX: encode terminal modes */ | |
954 | packet_send(); | |
b5c334cc | 955 | interactive = 1; |
8ce64345 | 956 | /* XXX wait for reply */ |
957 | } | |
0b242b12 | 958 | if (options.forward_x11 && |
959 | getenv("DISPLAY") != NULL) { | |
960 | char proto[512], data[512]; | |
961 | /* Get reasonable local authentication information. */ | |
962 | x11_get_proto(proto, sizeof proto, data, sizeof data); | |
963 | /* Request forwarding with authentication spoofing. */ | |
964 | debug("Requesting X11 forwarding with authentication spoofing."); | |
965 | x11_request_forwarding_with_spoofing(id, proto, data); | |
b5c334cc | 966 | interactive = 1; |
0b242b12 | 967 | /* XXX wait for reply */ |
968 | } | |
969 | ||
fa08c86b | 970 | check_agent_present(); |
971 | if (options.forward_agent) { | |
972 | debug("Requesting authentication agent forwarding."); | |
973 | channel_request_start(id, "auth-agent-req@openssh.com", 0); | |
974 | packet_send(); | |
975 | } | |
976 | ||
8ce64345 | 977 | len = buffer_len(&command); |
978 | if (len > 0) { | |
979 | if (len > 900) | |
980 | len = 900; | |
981 | debug("Sending command: %.*s", len, buffer_ptr(&command)); | |
982 | channel_request_start(id, "exec", 0); | |
983 | packet_put_string(buffer_ptr(&command), len); | |
984 | packet_send(); | |
985 | } else { | |
986 | channel_request(id, "shell", 0); | |
987 | } | |
988 | /* channel_callback(id, SSH2_MSG_OPEN_CONFIGMATION, client_init, 0); */ | |
989 | done: | |
990 | /* register different callback, etc. XXX */ | |
b5c334cc | 991 | packet_set_interactive(interactive); |
992 | clientloop_set_session_ident(id); | |
8ce64345 | 993 | } |
994 | ||
995 | int | |
996 | ssh_session2(void) | |
997 | { | |
998 | int window, packetmax, id; | |
2e73a022 | 999 | int in, out, err; |
1000 | ||
14a9a859 | 1001 | if (stdin_null_flag) { |
1002 | in = open("/dev/null", O_RDONLY); | |
1003 | } else { | |
1004 | in = dup(STDIN_FILENO); | |
1005 | } | |
2e73a022 | 1006 | out = dup(STDOUT_FILENO); |
1007 | err = dup(STDERR_FILENO); | |
8ce64345 | 1008 | |
1009 | if (in < 0 || out < 0 || err < 0) | |
14a9a859 | 1010 | fatal("dup() in/out/err failed"); |
8ce64345 | 1011 | |
a22aff1f | 1012 | /* enable nonblocking unless tty */ |
1013 | if (!isatty(in)) | |
1014 | set_nonblock(in); | |
1015 | if (!isatty(out)) | |
1016 | set_nonblock(out); | |
1017 | if (!isatty(err)) | |
1018 | set_nonblock(err); | |
1019 | ||
fa08c86b | 1020 | /* XXX should be pre-session */ |
1021 | ssh_init_forwarding(); | |
8ce64345 | 1022 | |
14a9a859 | 1023 | /* If requested, let ssh continue in the background. */ |
1024 | if (fork_after_authentication_flag) | |
1025 | if (daemon(1, 1) < 0) | |
1026 | fatal("daemon() failed: %.200s", strerror(errno)); | |
1027 | ||
bcbf86ec | 1028 | window = CHAN_SES_WINDOW_DEFAULT; |
1029 | packetmax = CHAN_SES_PACKET_DEFAULT; | |
1030 | if (!tty_flag) { | |
8ce64345 | 1031 | window *= 2; |
bcbf86ec | 1032 | packetmax *=2; |
8ce64345 | 1033 | } |
8ce64345 | 1034 | id = channel_new( |
1035 | "session", SSH_CHANNEL_OPENING, in, out, err, | |
bcbf86ec | 1036 | window, packetmax, CHAN_EXTENDED_WRITE, |
a22aff1f | 1037 | xstrdup("client-session"), /*nonblock*/0); |
8ce64345 | 1038 | |
8ce64345 | 1039 | channel_open(id); |
fa08c86b | 1040 | channel_register_callback(id, SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, |
1041 | ssh_session2_callback, (void *)0); | |
5260325f | 1042 | |
2e73a022 | 1043 | return client_loop(tty_flag, tty_flag ? options.escape_char : -1, id); |
8efc0c15 | 1044 | } |
fa08c86b | 1045 | |
1046 | int | |
1047 | guess_identity_file_type(const char *filename) | |
1048 | { | |
1049 | struct stat st; | |
1050 | Key *public; | |
1051 | int type = KEY_RSA1; /* default */ | |
1052 | ||
1053 | if (stat(filename, &st) < 0) { | |
d343d900 | 1054 | /* ignore this key */ |
fa08c86b | 1055 | return KEY_UNSPEC; |
1056 | } | |
1057 | public = key_new(type); | |
1058 | if (!load_public_key(filename, public, NULL)) { | |
1059 | /* ok, so we will assume this is 'some' key */ | |
1060 | type = KEY_UNSPEC; | |
1061 | } | |
1062 | key_free(public); | |
1063 | return type; | |
1064 | } |