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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" | |
5ca51e19 | 42 | RCSID("$OpenBSD: ssh.c,v 1.93 2001/02/08 19:30:52 itojun 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 | ||
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"); |
161 | fprintf(stderr, " -i file Identity for RSA authentication (default: ~/.ssh/identity).\n"); | |
162 | fprintf(stderr, " -t Tty; allocate a tty even if command is given.\n"); | |
8ce64345 | 163 | fprintf(stderr, " -T Do not allocate a tty.\n"); |
5260325f | 164 | fprintf(stderr, " -v Verbose; display verbose debugging messages.\n"); |
bcbf86ec | 165 | fprintf(stderr, " Multiple -v increases verbosity.\n"); |
5260325f | 166 | fprintf(stderr, " -V Display version number only.\n"); |
167 | fprintf(stderr, " -P Don't allocate a privileged port.\n"); | |
168 | fprintf(stderr, " -q Quiet; don't display any warning messages.\n"); | |
169 | fprintf(stderr, " -f Fork into background after authentication.\n"); | |
170 | fprintf(stderr, " -e char Set escape character; ``none'' = disable (default: ~).\n"); | |
171 | ||
172 | fprintf(stderr, " -c cipher Select encryption algorithm: " | |
173 | "``3des'', " | |
174 | "``blowfish''\n"); | |
175 | fprintf(stderr, " -p port Connect to this port. Server must be on the same port.\n"); | |
176 | fprintf(stderr, " -L listen-port:host:port Forward local port to remote address\n"); | |
177 | fprintf(stderr, " -R listen-port:host:port Forward remote port to local address\n"); | |
1fe6a48f | 178 | fprintf(stderr, " These cause %s to listen for connections on a port, and\n", __progname); |
5260325f | 179 | fprintf(stderr, " forward them to the other side by connecting to host:port.\n"); |
180 | fprintf(stderr, " -C Enable compression.\n"); | |
8ce64345 | 181 | fprintf(stderr, " -N Do not execute a shell or command.\n"); |
5260325f | 182 | fprintf(stderr, " -g Allow remote hosts to connect to forwarded ports.\n"); |
48e671d5 | 183 | fprintf(stderr, " -4 Use IPv4 only.\n"); |
184 | fprintf(stderr, " -6 Use IPv6 only.\n"); | |
6ae2364d | 185 | fprintf(stderr, " -2 Force protocol version 2.\n"); |
5260325f | 186 | fprintf(stderr, " -o 'option' Process the option as if it was read from a configuration file.\n"); |
ae810de7 | 187 | fprintf(stderr, " -s Invoke command (mandatory) as SSH2 subsystem.\n"); |
5260325f | 188 | exit(1); |
8efc0c15 | 189 | } |
190 | ||
5260325f | 191 | /* |
192 | * Connects to the given host using rsh (or prints an error message and exits | |
193 | * if rsh is not available). This function never returns. | |
194 | */ | |
8efc0c15 | 195 | void |
5260325f | 196 | rsh_connect(char *host, char *user, Buffer * command) |
8efc0c15 | 197 | { |
5260325f | 198 | char *args[10]; |
199 | int i; | |
200 | ||
201 | log("Using rsh. WARNING: Connection will not be encrypted."); | |
202 | /* Build argument list for rsh. */ | |
203 | i = 0; | |
204 | args[i++] = _PATH_RSH; | |
205 | /* host may have to come after user on some systems */ | |
206 | args[i++] = host; | |
207 | if (user) { | |
208 | args[i++] = "-l"; | |
209 | args[i++] = user; | |
210 | } | |
211 | if (buffer_len(command) > 0) { | |
212 | buffer_append(command, "\0", 1); | |
213 | args[i++] = buffer_ptr(command); | |
214 | } | |
215 | args[i++] = NULL; | |
216 | if (debug_flag) { | |
217 | for (i = 0; args[i]; i++) { | |
218 | if (i != 0) | |
219 | fprintf(stderr, " "); | |
220 | fprintf(stderr, "%s", args[i]); | |
221 | } | |
222 | fprintf(stderr, "\n"); | |
8efc0c15 | 223 | } |
5260325f | 224 | execv(_PATH_RSH, args); |
225 | perror(_PATH_RSH); | |
226 | exit(1); | |
8efc0c15 | 227 | } |
228 | ||
fa08c86b | 229 | int ssh_session(void); |
230 | int ssh_session2(void); | |
231 | int guess_identity_file_type(const char *filename); | |
8ce64345 | 232 | |
5260325f | 233 | /* |
234 | * Main program for the ssh client. | |
235 | */ | |
8efc0c15 | 236 | int |
237 | main(int ac, char **av) | |
238 | { | |
8ce64345 | 239 | int i, opt, optind, exit_status, ok; |
57112b5a | 240 | u_short fwd_port, fwd_host_port; |
5260325f | 241 | char *optarg, *cp, buf[256]; |
5260325f | 242 | struct stat st; |
243 | struct passwd *pw, pwcopy; | |
8ce64345 | 244 | int dummy; |
5260325f | 245 | uid_t original_effective_uid; |
5260325f | 246 | |
260d427b | 247 | __progname = get_progname(av[0]); |
264dce47 | 248 | init_rng(); |
249 | ||
aa3378df | 250 | /* |
251 | * Save the original real uid. It will be needed later (uid-swapping | |
252 | * may clobber the real uid). | |
253 | */ | |
5260325f | 254 | original_real_uid = getuid(); |
255 | original_effective_uid = geteuid(); | |
256 | ||
7322ef0e | 257 | #ifdef HAVE_SETRLIMIT |
5260325f | 258 | /* If we are installed setuid root be careful to not drop core. */ |
259 | if (original_real_uid != original_effective_uid) { | |
260 | struct rlimit rlim; | |
261 | rlim.rlim_cur = rlim.rlim_max = 0; | |
262 | if (setrlimit(RLIMIT_CORE, &rlim) < 0) | |
263 | fatal("setrlimit failed: %.100s", strerror(errno)); | |
8efc0c15 | 264 | } |
3c62e7eb | 265 | #endif |
aa3378df | 266 | /* |
267 | * Use uid-swapping to give up root privileges for the duration of | |
268 | * option processing. We will re-instantiate the rights when we are | |
269 | * ready to create the privileged port, and will permanently drop | |
270 | * them when the port has been created (actually, when the connection | |
271 | * has been made, as we may need to create the port several times). | |
272 | */ | |
5260325f | 273 | temporarily_use_uid(original_real_uid); |
274 | ||
aa3378df | 275 | /* |
276 | * Set our umask to something reasonable, as some files are created | |
277 | * with the default umask. This will make them world-readable but | |
278 | * writable only by the owner, which is ok for all files for which we | |
279 | * don't set the modes explicitly. | |
280 | */ | |
5260325f | 281 | umask(022); |
282 | ||
5260325f | 283 | /* Initialize option structure to indicate that no values have been set. */ |
284 | initialize_options(&options); | |
285 | ||
286 | /* Parse command-line arguments. */ | |
287 | host = NULL; | |
288 | ||
289 | /* If program name is not one of the standard names, use it as host name. */ | |
1fe6a48f | 290 | cp = __progname; |
3c62e7eb | 291 | #ifdef HAVE_CYGWIN |
292 | if (strcasecmp(cp, "rsh") && strcasecmp(cp, "ssh") && | |
293 | strcasecmp(cp, "rlogin") && strcasecmp(cp, "slogin") && | |
294 | strcasecmp(cp, "remsh") && | |
295 | strcasecmp(cp, "rsh.exe") && strcasecmp(cp, "ssh.exe") && | |
296 | strcasecmp(cp, "rlogin.exe") && strcasecmp(cp, "slogin.exe") && | |
297 | strcasecmp(cp, "remsh.exe")) | |
298 | #else | |
2e73a022 | 299 | if (strcmp(cp, "rsh") && strcmp(cp, "ssh") && strcmp(cp, "rlogin") && |
300 | strcmp(cp, "slogin") && strcmp(cp, "remsh")) | |
3c62e7eb | 301 | #endif |
5260325f | 302 | host = cp; |
303 | ||
304 | for (optind = 1; optind < ac; optind++) { | |
305 | if (av[optind][0] != '-') { | |
306 | if (host) | |
307 | break; | |
308 | if ((cp = strchr(av[optind], '@'))) { | |
6ae2364d | 309 | if(cp == av[optind]) |
310 | usage(); | |
5260325f | 311 | options.user = av[optind]; |
312 | *cp = '\0'; | |
313 | host = ++cp; | |
314 | } else | |
315 | host = av[optind]; | |
316 | continue; | |
317 | } | |
318 | opt = av[optind][1]; | |
319 | if (!opt) | |
320 | usage(); | |
321 | if (strchr("eilcpLRo", opt)) { /* options with arguments */ | |
322 | optarg = av[optind] + 2; | |
323 | if (strcmp(optarg, "") == 0) { | |
324 | if (optind >= ac - 1) | |
325 | usage(); | |
326 | optarg = av[++optind]; | |
327 | } | |
328 | } else { | |
329 | if (av[optind][2]) | |
330 | usage(); | |
331 | optarg = NULL; | |
332 | } | |
333 | switch (opt) { | |
6ae2364d | 334 | case '2': |
335 | options.protocol = SSH_PROTO_2; | |
336 | break; | |
48e671d5 | 337 | case '4': |
338 | IPv4or6 = AF_INET; | |
339 | break; | |
48e671d5 | 340 | case '6': |
341 | IPv4or6 = AF_INET6; | |
342 | break; | |
5260325f | 343 | case 'n': |
344 | stdin_null_flag = 1; | |
345 | break; | |
5260325f | 346 | case 'f': |
347 | fork_after_authentication_flag = 1; | |
348 | stdin_null_flag = 1; | |
349 | break; | |
5260325f | 350 | case 'x': |
351 | options.forward_x11 = 0; | |
352 | break; | |
5260325f | 353 | case 'X': |
354 | options.forward_x11 = 1; | |
355 | break; | |
5260325f | 356 | case 'g': |
357 | options.gateway_ports = 1; | |
358 | break; | |
5260325f | 359 | case 'P': |
360 | options.use_privileged_port = 0; | |
361 | break; | |
5260325f | 362 | case 'a': |
363 | options.forward_agent = 0; | |
364 | break; | |
71276795 | 365 | case 'A': |
366 | options.forward_agent = 1; | |
367 | break; | |
5260325f | 368 | #ifdef AFS |
369 | case 'k': | |
370 | options.kerberos_tgt_passing = 0; | |
371 | options.afs_token_passing = 0; | |
372 | break; | |
373 | #endif | |
374 | case 'i': | |
375 | if (stat(optarg, &st) < 0) { | |
376 | fprintf(stderr, "Warning: Identity file %s does not exist.\n", | |
fa08c86b | 377 | optarg); |
5260325f | 378 | break; |
379 | } | |
380 | if (options.num_identity_files >= SSH_MAX_IDENTITY_FILES) | |
381 | fatal("Too many identity files specified (max %d)", | |
fa08c86b | 382 | SSH_MAX_IDENTITY_FILES); |
383 | options.identity_files[options.num_identity_files++] = xstrdup(optarg); | |
5260325f | 384 | break; |
5260325f | 385 | case 't': |
8abcdba4 | 386 | if (tty_flag) |
387 | force_tty_flag = 1; | |
5260325f | 388 | tty_flag = 1; |
389 | break; | |
5260325f | 390 | case 'v': |
bcbf86ec | 391 | if (0 == debug_flag) { |
392 | debug_flag = 1; | |
393 | options.log_level = SYSLOG_LEVEL_DEBUG1; | |
394 | } else if (options.log_level < SYSLOG_LEVEL_DEBUG3) { | |
395 | options.log_level++; | |
396 | break; | |
397 | } else { | |
398 | fatal("Too high debugging level.\n"); | |
399 | } | |
400 | /* fallthrough */ | |
5260325f | 401 | case 'V': |
a8be9f80 | 402 | fprintf(stderr, "SSH Version %s, protocol versions %d.%d/%d.%d.\n", |
403 | SSH_VERSION, | |
404 | PROTOCOL_MAJOR_1, PROTOCOL_MINOR_1, | |
405 | PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2); | |
8ce64345 | 406 | fprintf(stderr, "Compiled with SSL (0x%8.8lx).\n", SSLeay()); |
5260325f | 407 | if (opt == 'V') |
408 | exit(0); | |
5260325f | 409 | break; |
5260325f | 410 | case 'q': |
411 | options.log_level = SYSLOG_LEVEL_QUIET; | |
412 | break; | |
5260325f | 413 | case 'e': |
414 | if (optarg[0] == '^' && optarg[2] == 0 && | |
1e3b8b07 | 415 | (u_char) optarg[1] >= 64 && (u_char) optarg[1] < 128) |
416 | options.escape_char = (u_char) optarg[1] & 31; | |
5260325f | 417 | else if (strlen(optarg) == 1) |
1e3b8b07 | 418 | options.escape_char = (u_char) optarg[0]; |
5260325f | 419 | else if (strcmp(optarg, "none") == 0) |
420 | options.escape_char = -2; | |
421 | else { | |
422 | fprintf(stderr, "Bad escape character '%s'.\n", optarg); | |
423 | exit(1); | |
424 | } | |
425 | break; | |
5260325f | 426 | case 'c': |
a306f2dd | 427 | if (ciphers_valid(optarg)) { |
428 | /* SSH2 only */ | |
429 | options.ciphers = xstrdup(optarg); | |
d0c832f3 | 430 | options.cipher = SSH_CIPHER_ILLEGAL; |
a306f2dd | 431 | } else { |
432 | /* SSH1 only */ | |
c523303b | 433 | options.cipher = cipher_number(optarg); |
434 | if (options.cipher == -1) { | |
a306f2dd | 435 | fprintf(stderr, "Unknown cipher type '%s'\n", optarg); |
436 | exit(1); | |
437 | } | |
c523303b | 438 | if (options.cipher == SSH_CIPHER_3DES) { |
439 | options.ciphers = "3des-cbc"; | |
440 | } else if (options.cipher == SSH_CIPHER_BLOWFISH) { | |
441 | options.ciphers = "blowfish-cbc"; | |
442 | } else { | |
443 | options.ciphers = (char *)-1; | |
444 | } | |
5260325f | 445 | } |
446 | break; | |
5260325f | 447 | case 'p': |
448 | options.port = atoi(optarg); | |
5260325f | 449 | break; |
5260325f | 450 | case 'l': |
451 | options.user = optarg; | |
452 | break; | |
5260325f | 453 | case 'R': |
48e671d5 | 454 | if (sscanf(optarg, "%hu/%255[^/]/%hu", &fwd_port, buf, |
455 | &fwd_host_port) != 3 && | |
456 | sscanf(optarg, "%hu:%255[^:]:%hu", &fwd_port, buf, | |
457 | &fwd_host_port) != 3) { | |
5260325f | 458 | fprintf(stderr, "Bad forwarding specification '%s'.\n", optarg); |
459 | usage(); | |
460 | /* NOTREACHED */ | |
461 | } | |
462 | add_remote_forward(&options, fwd_port, buf, fwd_host_port); | |
463 | break; | |
5260325f | 464 | case 'L': |
48e671d5 | 465 | if (sscanf(optarg, "%hu/%255[^/]/%hu", &fwd_port, buf, |
466 | &fwd_host_port) != 3 && | |
467 | sscanf(optarg, "%hu:%255[^:]:%hu", &fwd_port, buf, | |
468 | &fwd_host_port) != 3) { | |
5260325f | 469 | fprintf(stderr, "Bad forwarding specification '%s'.\n", optarg); |
470 | usage(); | |
471 | /* NOTREACHED */ | |
472 | } | |
473 | add_local_forward(&options, fwd_port, buf, fwd_host_port); | |
474 | break; | |
5260325f | 475 | case 'C': |
476 | options.compression = 1; | |
477 | break; | |
8ce64345 | 478 | case 'N': |
479 | no_shell_flag = 1; | |
480 | no_tty_flag = 1; | |
481 | break; | |
8ce64345 | 482 | case 'T': |
483 | no_tty_flag = 1; | |
484 | break; | |
5260325f | 485 | case 'o': |
486 | dummy = 1; | |
487 | if (process_config_line(&options, host ? host : "", optarg, | |
488 | "command-line", 0, &dummy) != 0) | |
489 | exit(1); | |
490 | break; | |
ae810de7 | 491 | case 's': |
492 | subsystem_flag = 1; | |
493 | break; | |
5260325f | 494 | default: |
495 | usage(); | |
496 | } | |
497 | } | |
498 | ||
499 | /* Check that we got a host name. */ | |
500 | if (!host) | |
8efc0c15 | 501 | usage(); |
5260325f | 502 | |
22d89d24 | 503 | SSLeay_add_all_algorithms(); |
fa08c86b | 504 | ERR_load_crypto_strings(); |
22d89d24 | 505 | |
5260325f | 506 | /* Initialize the command to execute on remote host. */ |
507 | buffer_init(&command); | |
508 | ||
aa3378df | 509 | /* |
510 | * Save the command to execute on the remote host in a buffer. There | |
511 | * is no limit on the length of the command, except by the maximum | |
512 | * packet size. Also sets the tty flag if there is no command. | |
513 | */ | |
5260325f | 514 | if (optind == ac) { |
515 | /* No command specified - execute shell on a tty. */ | |
516 | tty_flag = 1; | |
ae810de7 | 517 | if (subsystem_flag) { |
518 | fprintf(stderr, "You must specify a subsystem to invoke."); | |
519 | usage(); | |
520 | } | |
5260325f | 521 | } else { |
522 | /* A command has been specified. Store it into the | |
523 | buffer. */ | |
524 | for (i = optind; i < ac; i++) { | |
525 | if (i > optind) | |
526 | buffer_append(&command, " ", 1); | |
527 | buffer_append(&command, av[i], strlen(av[i])); | |
528 | } | |
8efc0c15 | 529 | } |
5260325f | 530 | |
531 | /* Cannot fork to background if no command. */ | |
14a9a859 | 532 | if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag) |
5260325f | 533 | fatal("Cannot fork into background without a command to execute."); |
534 | ||
535 | /* Allocate a tty by default if no command specified. */ | |
536 | if (buffer_len(&command) == 0) | |
537 | tty_flag = 1; | |
538 | ||
0b6fbf03 | 539 | /* Force no tty*/ |
540 | if (no_tty_flag) | |
541 | tty_flag = 0; | |
5260325f | 542 | /* Do not allocate a tty if stdin is not a tty. */ |
8abcdba4 | 543 | if (!isatty(fileno(stdin)) && !force_tty_flag) { |
5260325f | 544 | if (tty_flag) |
b5c334cc | 545 | log("Pseudo-terminal will not be allocated because stdin is not a terminal.\n"); |
5260325f | 546 | tty_flag = 0; |
547 | } | |
8ce64345 | 548 | |
5260325f | 549 | /* Get user data. */ |
550 | pw = getpwuid(original_real_uid); | |
551 | if (!pw) { | |
b5c334cc | 552 | log("You don't exist, go away!\n"); |
5260325f | 553 | exit(1); |
554 | } | |
555 | /* Take a copy of the returned structure. */ | |
556 | memset(&pwcopy, 0, sizeof(pwcopy)); | |
557 | pwcopy.pw_name = xstrdup(pw->pw_name); | |
558 | pwcopy.pw_passwd = xstrdup(pw->pw_passwd); | |
559 | pwcopy.pw_uid = pw->pw_uid; | |
560 | pwcopy.pw_gid = pw->pw_gid; | |
2e73a022 | 561 | #ifdef HAVE_PW_CLASS_IN_PASSWD |
562 | pwcopy.pw_class = xstrdup(pw->pw_class); | |
563 | #endif | |
5260325f | 564 | pwcopy.pw_dir = xstrdup(pw->pw_dir); |
565 | pwcopy.pw_shell = xstrdup(pw->pw_shell); | |
566 | pw = &pwcopy; | |
567 | ||
568 | /* Initialize "log" output. Since we are the client all output | |
569 | actually goes to the terminal. */ | |
570 | log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 0); | |
571 | ||
572 | /* Read per-user configuration file. */ | |
42f11eb2 | 573 | snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, _PATH_SSH_USER_CONFFILE); |
5260325f | 574 | read_config_file(buf, host, &options); |
575 | ||
576 | /* Read systemwide configuration file. */ | |
42f11eb2 | 577 | read_config_file(_PATH_HOST_CONFIG_FILE, host, &options); |
5260325f | 578 | |
579 | /* Fill configuration defaults. */ | |
580 | fill_default_options(&options); | |
581 | ||
582 | /* reinit */ | |
583 | log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 0); | |
584 | ||
585 | if (options.user == NULL) | |
586 | options.user = xstrdup(pw->pw_name); | |
587 | ||
588 | if (options.hostname != NULL) | |
589 | host = options.hostname; | |
590 | ||
5260325f | 591 | /* Disable rhosts authentication if not running as root. */ |
3c62e7eb | 592 | #ifdef HAVE_CYGWIN |
593 | /* Ignore uid if running under Windows */ | |
594 | if (!options.use_privileged_port) { | |
595 | #else | |
5260325f | 596 | if (original_effective_uid != 0 || !options.use_privileged_port) { |
3c62e7eb | 597 | #endif |
6ffc9c88 | 598 | debug("Rhosts Authentication disabled, " |
599 | "originating port will not be trusted."); | |
5260325f | 600 | options.rhosts_authentication = 0; |
5260325f | 601 | } |
aa3378df | 602 | /* |
603 | * If using rsh has been selected, exec it now (without trying | |
604 | * anything else). Note that we must release privileges first. | |
605 | */ | |
5260325f | 606 | if (options.use_rsh) { |
aa3378df | 607 | /* |
608 | * Restore our superuser privileges. This must be done | |
609 | * before permanently setting the uid. | |
610 | */ | |
5260325f | 611 | restore_uid(); |
612 | ||
613 | /* Switch to the original uid permanently. */ | |
614 | permanently_set_uid(original_real_uid); | |
615 | ||
616 | /* Execute rsh. */ | |
617 | rsh_connect(host, options.user, &command); | |
618 | fatal("rsh_connect returned"); | |
8efc0c15 | 619 | } |
5260325f | 620 | /* Restore our superuser privileges. */ |
621 | restore_uid(); | |
622 | ||
6ffc9c88 | 623 | /* Open a connection to the remote host. */ |
5260325f | 624 | |
625 | ok = ssh_connect(host, &hostaddr, options.port, | |
6ffc9c88 | 626 | options.connection_attempts, |
627 | original_effective_uid != 0 || !options.use_privileged_port, | |
628 | original_real_uid, | |
629 | options.proxy_command); | |
5260325f | 630 | |
aa3378df | 631 | /* |
632 | * If we successfully made the connection, load the host private key | |
633 | * in case we will need it later for combined rsa-rhosts | |
634 | * authentication. This must be done before releasing extra | |
635 | * privileges, because the file is only readable by root. | |
636 | */ | |
a306f2dd | 637 | if (ok && (options.protocol & SSH_PROTO_1)) { |
638 | Key k; | |
5260325f | 639 | host_private_key = RSA_new(); |
fa08c86b | 640 | k.type = KEY_RSA1; |
a306f2dd | 641 | k.rsa = host_private_key; |
42f11eb2 | 642 | if (load_private_key(_PATH_HOST_KEY_FILE, "", &k, NULL)) |
5260325f | 643 | host_private_key_loaded = 1; |
644 | } | |
aa3378df | 645 | /* |
646 | * Get rid of any extra privileges that we may have. We will no | |
647 | * longer need them. Also, extra privileges could make it very hard | |
648 | * to read identity files and other non-world-readable files from the | |
649 | * user's home directory if it happens to be on a NFS volume where | |
650 | * root is mapped to nobody. | |
651 | */ | |
652 | ||
653 | /* | |
654 | * Note that some legacy systems need to postpone the following call | |
655 | * to permanently_set_uid() until the private hostkey is destroyed | |
656 | * with RSA_free(). Otherwise the calling user could ptrace() the | |
657 | * process, read the private hostkey and impersonate the host. | |
658 | * OpenBSD does not allow ptracing of setuid processes. | |
659 | */ | |
5260325f | 660 | permanently_set_uid(original_real_uid); |
661 | ||
aa3378df | 662 | /* |
663 | * Now that we are back to our own permissions, create ~/.ssh | |
664 | * directory if it doesn\'t already exist. | |
665 | */ | |
42f11eb2 | 666 | snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, _PATH_SSH_USER_DIR); |
5260325f | 667 | if (stat(buf, &st) < 0) |
704b1659 | 668 | if (mkdir(buf, 0700) < 0) |
5260325f | 669 | error("Could not create directory '%.200s'.", buf); |
670 | ||
671 | /* Check if the connection failed, and try "rsh" if appropriate. */ | |
672 | if (!ok) { | |
673 | if (options.port != 0) | |
57112b5a | 674 | log("Secure connection to %.100s on port %hu refused%.100s.", |
5260325f | 675 | host, options.port, |
676 | options.fallback_to_rsh ? "; reverting to insecure method" : ""); | |
677 | else | |
678 | log("Secure connection to %.100s refused%.100s.", host, | |
679 | options.fallback_to_rsh ? "; reverting to insecure method" : ""); | |
680 | ||
681 | if (options.fallback_to_rsh) { | |
682 | rsh_connect(host, options.user, &command); | |
683 | fatal("rsh_connect returned"); | |
684 | } | |
685 | exit(1); | |
8efc0c15 | 686 | } |
fa08c86b | 687 | /* Expand ~ in options.identity_files, known host file names. */ |
a306f2dd | 688 | /* XXX mem-leaks */ |
fa08c86b | 689 | for (i = 0; i < options.num_identity_files; i++) { |
5260325f | 690 | options.identity_files[i] = |
fa08c86b | 691 | tilde_expand_filename(options.identity_files[i], original_real_uid); |
692 | options.identity_files_type[i] = guess_identity_file_type(options.identity_files[i]); | |
693 | debug("identity file %s type %d", options.identity_files[i], | |
694 | options.identity_files_type[i]); | |
695 | } | |
696 | options.system_hostfile = | |
697 | tilde_expand_filename(options.system_hostfile, original_real_uid); | |
698 | options.user_hostfile = | |
699 | tilde_expand_filename(options.user_hostfile, original_real_uid); | |
700 | options.system_hostfile2 = | |
701 | tilde_expand_filename(options.system_hostfile2, original_real_uid); | |
702 | options.user_hostfile2 = | |
703 | tilde_expand_filename(options.user_hostfile2, original_real_uid); | |
5260325f | 704 | |
705 | /* Log into the remote system. This never returns if the login fails. */ | |
706 | ssh_login(host_private_key_loaded, host_private_key, | |
48e671d5 | 707 | host, (struct sockaddr *)&hostaddr, original_real_uid); |
5260325f | 708 | |
709 | /* We no longer need the host private key. Clear it now. */ | |
710 | if (host_private_key_loaded) | |
711 | RSA_free(host_private_key); /* Destroys contents safely */ | |
712 | ||
8ce64345 | 713 | exit_status = compat20 ? ssh_session2() : ssh_session(); |
714 | packet_close(); | |
715 | return exit_status; | |
716 | } | |
717 | ||
0b242b12 | 718 | void |
719 | x11_get_proto(char *proto, int proto_len, char *data, int data_len) | |
720 | { | |
721 | char line[512]; | |
722 | FILE *f; | |
723 | int got_data = 0, i; | |
724 | ||
fa649821 | 725 | if (options.xauth_location) { |
726 | /* Try to get Xauthority information for the display. */ | |
5ca51e19 | 727 | snprintf(line, sizeof line, "%.100s list %.200s 2>" _PATH_DEVNULL, |
fa649821 | 728 | options.xauth_location, getenv("DISPLAY")); |
729 | f = popen(line, "r"); | |
730 | if (f && fgets(line, sizeof(line), f) && | |
731 | sscanf(line, "%*s %s %s", proto, data) == 2) | |
732 | got_data = 1; | |
733 | if (f) | |
734 | pclose(f); | |
735 | } | |
0b242b12 | 736 | /* |
737 | * If we didn't get authentication data, just make up some | |
738 | * data. The forwarding code will check the validity of the | |
739 | * response anyway, and substitute this data. The X11 | |
740 | * server, however, will ignore this fake data and use | |
741 | * whatever authentication mechanisms it was using otherwise | |
742 | * for the local connection. | |
743 | */ | |
744 | if (!got_data) { | |
745 | u_int32_t rand = 0; | |
746 | ||
747 | strlcpy(proto, "MIT-MAGIC-COOKIE-1", proto_len); | |
748 | for (i = 0; i < 16; i++) { | |
749 | if (i % 4 == 0) | |
750 | rand = arc4random(); | |
751 | snprintf(data + 2 * i, data_len - 2 * i, "%02x", rand & 0xff); | |
752 | rand >>= 8; | |
753 | } | |
754 | } | |
755 | } | |
756 | ||
fa08c86b | 757 | void |
758 | ssh_init_forwarding(void) | |
759 | { | |
02a024dd | 760 | int success = 0; |
fa08c86b | 761 | int i; |
02a024dd | 762 | |
fa08c86b | 763 | /* Initiate local TCP/IP port forwardings. */ |
764 | for (i = 0; i < options.num_local_forwards; i++) { | |
765 | debug("Connections to local port %d forwarded to remote address %.200s:%d", | |
766 | options.local_forwards[i].port, | |
767 | options.local_forwards[i].host, | |
768 | options.local_forwards[i].host_port); | |
02a024dd | 769 | success += channel_request_local_forwarding( |
fa08c86b | 770 | options.local_forwards[i].port, |
771 | options.local_forwards[i].host, | |
772 | options.local_forwards[i].host_port, | |
773 | options.gateway_ports); | |
774 | } | |
02a024dd | 775 | if (i > 0 && success == 0) |
776 | error("Could not request local forwarding."); | |
fa08c86b | 777 | |
778 | /* Initiate remote TCP/IP port forwardings. */ | |
779 | for (i = 0; i < options.num_remote_forwards; i++) { | |
780 | debug("Connections to remote port %d forwarded to local address %.200s:%d", | |
781 | options.remote_forwards[i].port, | |
782 | options.remote_forwards[i].host, | |
783 | options.remote_forwards[i].host_port); | |
784 | channel_request_remote_forwarding( | |
785 | options.remote_forwards[i].port, | |
786 | options.remote_forwards[i].host, | |
787 | options.remote_forwards[i].host_port); | |
788 | } | |
789 | } | |
790 | ||
791 | void | |
792 | check_agent_present(void) | |
793 | { | |
794 | if (options.forward_agent) { | |
795 | /* Clear agent forwarding if we don\'t have an agent. */ | |
796 | int authfd = ssh_get_authentication_socket(); | |
797 | if (authfd < 0) | |
798 | options.forward_agent = 0; | |
799 | else | |
800 | ssh_close_authentication_socket(authfd); | |
801 | } | |
802 | } | |
803 | ||
8ce64345 | 804 | int |
805 | ssh_session(void) | |
806 | { | |
807 | int type; | |
8ce64345 | 808 | int plen; |
809 | int interactive = 0; | |
810 | int have_tty = 0; | |
811 | struct winsize ws; | |
8ce64345 | 812 | char *cp; |
813 | ||
5260325f | 814 | /* Enable compression if requested. */ |
815 | if (options.compression) { | |
816 | debug("Requesting compression at level %d.", options.compression_level); | |
817 | ||
818 | if (options.compression_level < 1 || options.compression_level > 9) | |
819 | fatal("Compression level must be from 1 (fast) to 9 (slow, best)."); | |
820 | ||
821 | /* Send the request. */ | |
822 | packet_start(SSH_CMSG_REQUEST_COMPRESSION); | |
823 | packet_put_int(options.compression_level); | |
824 | packet_send(); | |
825 | packet_write_wait(); | |
826 | type = packet_read(&plen); | |
827 | if (type == SSH_SMSG_SUCCESS) | |
828 | packet_start_compression(options.compression_level); | |
829 | else if (type == SSH_SMSG_FAILURE) | |
830 | log("Warning: Remote host refused compression."); | |
831 | else | |
832 | packet_disconnect("Protocol error waiting for compression response."); | |
833 | } | |
834 | /* Allocate a pseudo tty if appropriate. */ | |
835 | if (tty_flag) { | |
836 | debug("Requesting pty."); | |
837 | ||
838 | /* Start the packet. */ | |
839 | packet_start(SSH_CMSG_REQUEST_PTY); | |
840 | ||
841 | /* Store TERM in the packet. There is no limit on the | |
842 | length of the string. */ | |
843 | cp = getenv("TERM"); | |
844 | if (!cp) | |
845 | cp = ""; | |
846 | packet_put_string(cp, strlen(cp)); | |
847 | ||
848 | /* Store window size in the packet. */ | |
849 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) | |
850 | memset(&ws, 0, sizeof(ws)); | |
851 | packet_put_int(ws.ws_row); | |
852 | packet_put_int(ws.ws_col); | |
853 | packet_put_int(ws.ws_xpixel); | |
854 | packet_put_int(ws.ws_ypixel); | |
855 | ||
856 | /* Store tty modes in the packet. */ | |
857 | tty_make_modes(fileno(stdin)); | |
858 | ||
859 | /* Send the packet, and wait for it to leave. */ | |
860 | packet_send(); | |
861 | packet_write_wait(); | |
862 | ||
863 | /* Read response from the server. */ | |
864 | type = packet_read(&plen); | |
4fe2af09 | 865 | if (type == SSH_SMSG_SUCCESS) { |
5260325f | 866 | interactive = 1; |
8ce64345 | 867 | have_tty = 1; |
4fe2af09 | 868 | } else if (type == SSH_SMSG_FAILURE) |
5260325f | 869 | log("Warning: Remote host failed or refused to allocate a pseudo tty."); |
870 | else | |
871 | packet_disconnect("Protocol error waiting for pty request response."); | |
872 | } | |
873 | /* Request X11 forwarding if enabled and DISPLAY is set. */ | |
874 | if (options.forward_x11 && getenv("DISPLAY") != NULL) { | |
0b242b12 | 875 | char proto[512], data[512]; |
876 | /* Get reasonable local authentication information. */ | |
877 | x11_get_proto(proto, sizeof proto, data, sizeof data); | |
878 | /* Request forwarding with authentication spoofing. */ | |
5260325f | 879 | debug("Requesting X11 forwarding with authentication spoofing."); |
0b242b12 | 880 | x11_request_forwarding_with_spoofing(0, proto, data); |
5260325f | 881 | |
882 | /* Read response from the server. */ | |
883 | type = packet_read(&plen); | |
884 | if (type == SSH_SMSG_SUCCESS) { | |
5260325f | 885 | interactive = 1; |
0b242b12 | 886 | } else if (type == SSH_SMSG_FAILURE) { |
5260325f | 887 | log("Warning: Remote host denied X11 forwarding."); |
0b242b12 | 888 | } else { |
5260325f | 889 | packet_disconnect("Protocol error waiting for X11 forwarding"); |
0b242b12 | 890 | } |
5260325f | 891 | } |
892 | /* Tell the packet module whether this is an interactive session. */ | |
b5c334cc | 893 | packet_set_interactive(interactive); |
5260325f | 894 | |
895 | /* Request authentication agent forwarding if appropriate. */ | |
fa08c86b | 896 | check_agent_present(); |
897 | ||
5260325f | 898 | if (options.forward_agent) { |
899 | debug("Requesting authentication agent forwarding."); | |
900 | auth_request_forwarding(); | |
901 | ||
902 | /* Read response from the server. */ | |
903 | type = packet_read(&plen); | |
904 | packet_integrity_check(plen, 0, type); | |
905 | if (type != SSH_SMSG_SUCCESS) | |
906 | log("Warning: Remote host denied authentication agent forwarding."); | |
907 | } | |
8efc0c15 | 908 | |
fa08c86b | 909 | /* Initiate port forwardings. */ |
910 | ssh_init_forwarding(); | |
5260325f | 911 | |
aa3378df | 912 | /* If requested, let ssh continue in the background. */ |
6ae2364d | 913 | if (fork_after_authentication_flag) |
aa3378df | 914 | if (daemon(1, 1) < 0) |
915 | fatal("daemon() failed: %.200s", strerror(errno)); | |
916 | ||
917 | /* | |
918 | * If a command was specified on the command line, execute the | |
919 | * command now. Otherwise request the server to start a shell. | |
920 | */ | |
5260325f | 921 | if (buffer_len(&command) > 0) { |
922 | int len = buffer_len(&command); | |
923 | if (len > 900) | |
924 | len = 900; | |
925 | debug("Sending command: %.*s", len, buffer_ptr(&command)); | |
926 | packet_start(SSH_CMSG_EXEC_CMD); | |
927 | packet_put_string(buffer_ptr(&command), buffer_len(&command)); | |
928 | packet_send(); | |
929 | packet_write_wait(); | |
930 | } else { | |
931 | debug("Requesting shell."); | |
932 | packet_start(SSH_CMSG_EXEC_SHELL); | |
933 | packet_send(); | |
934 | packet_write_wait(); | |
935 | } | |
936 | ||
937 | /* Enter the interactive session. */ | |
2e73a022 | 938 | return client_loop(have_tty, tty_flag ? options.escape_char : -1, 0); |
8ce64345 | 939 | } |
5260325f | 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)); | |
998 | channel_request_start(id, "subsystem", 0); | |
999 | } else { | |
1000 | debug("Sending command: %.*s", len, buffer_ptr(&command)); | |
1001 | channel_request_start(id, "exec", 0); | |
1002 | } | |
8ce64345 | 1003 | packet_put_string(buffer_ptr(&command), len); |
1004 | packet_send(); | |
1005 | } else { | |
1006 | channel_request(id, "shell", 0); | |
1007 | } | |
1008 | /* channel_callback(id, SSH2_MSG_OPEN_CONFIGMATION, client_init, 0); */ | |
1009 | done: | |
1010 | /* register different callback, etc. XXX */ | |
b5c334cc | 1011 | packet_set_interactive(interactive); |
1012 | clientloop_set_session_ident(id); | |
8ce64345 | 1013 | } |
1014 | ||
1015 | int | |
1016 | ssh_session2(void) | |
1017 | { | |
1018 | int window, packetmax, id; | |
2e73a022 | 1019 | int in, out, err; |
1020 | ||
14a9a859 | 1021 | if (stdin_null_flag) { |
5ca51e19 | 1022 | in = open(_PATH_DEVNULL, O_RDONLY); |
14a9a859 | 1023 | } else { |
1024 | in = dup(STDIN_FILENO); | |
1025 | } | |
2e73a022 | 1026 | out = dup(STDOUT_FILENO); |
1027 | err = dup(STDERR_FILENO); | |
8ce64345 | 1028 | |
1029 | if (in < 0 || out < 0 || err < 0) | |
14a9a859 | 1030 | fatal("dup() in/out/err failed"); |
8ce64345 | 1031 | |
a22aff1f | 1032 | /* enable nonblocking unless tty */ |
1033 | if (!isatty(in)) | |
1034 | set_nonblock(in); | |
1035 | if (!isatty(out)) | |
1036 | set_nonblock(out); | |
1037 | if (!isatty(err)) | |
1038 | set_nonblock(err); | |
1039 | ||
fa08c86b | 1040 | /* XXX should be pre-session */ |
1041 | ssh_init_forwarding(); | |
2b87da3b | 1042 | |
14a9a859 | 1043 | /* If requested, let ssh continue in the background. */ |
1044 | if (fork_after_authentication_flag) | |
1045 | if (daemon(1, 1) < 0) | |
1046 | fatal("daemon() failed: %.200s", strerror(errno)); | |
1047 | ||
bcbf86ec | 1048 | window = CHAN_SES_WINDOW_DEFAULT; |
1049 | packetmax = CHAN_SES_PACKET_DEFAULT; | |
1050 | if (!tty_flag) { | |
8ce64345 | 1051 | window *= 2; |
bcbf86ec | 1052 | packetmax *=2; |
8ce64345 | 1053 | } |
8ce64345 | 1054 | id = channel_new( |
1055 | "session", SSH_CHANNEL_OPENING, in, out, err, | |
bcbf86ec | 1056 | window, packetmax, CHAN_EXTENDED_WRITE, |
a22aff1f | 1057 | xstrdup("client-session"), /*nonblock*/0); |
8ce64345 | 1058 | |
8ce64345 | 1059 | channel_open(id); |
fa08c86b | 1060 | channel_register_callback(id, SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, |
1061 | ssh_session2_callback, (void *)0); | |
5260325f | 1062 | |
2e73a022 | 1063 | return client_loop(tty_flag, tty_flag ? options.escape_char : -1, id); |
8efc0c15 | 1064 | } |
fa08c86b | 1065 | |
1066 | int | |
1067 | guess_identity_file_type(const char *filename) | |
1068 | { | |
1069 | struct stat st; | |
1070 | Key *public; | |
1071 | int type = KEY_RSA1; /* default */ | |
1072 | ||
1073 | if (stat(filename, &st) < 0) { | |
d343d900 | 1074 | /* ignore this key */ |
fa08c86b | 1075 | return KEY_UNSPEC; |
1076 | } | |
1077 | public = key_new(type); | |
1078 | if (!load_public_key(filename, public, NULL)) { | |
1079 | /* ok, so we will assume this is 'some' key */ | |
1080 | type = KEY_UNSPEC; | |
1081 | } | |
1082 | key_free(public); | |
1083 | return type; | |
1084 | } |