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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" | |
8abcdba4 | 42 | RCSID("$OpenBSD: ssh.c,v 1.79 2000/12/27 11:51:54 markus Exp $"); |
8efc0c15 | 43 | |
a306f2dd | 44 | #include <openssl/evp.h> |
45 | #include <openssl/dsa.h> | |
46 | #include <openssl/rsa.h> | |
fa08c86b | 47 | #include <openssl/err.h> |
a306f2dd | 48 | |
8efc0c15 | 49 | #include "xmalloc.h" |
50 | #include "ssh.h" | |
51 | #include "packet.h" | |
52 | #include "buffer.h" | |
8efc0c15 | 53 | #include "readconf.h" |
54 | #include "uidswap.h" | |
8ce64345 | 55 | |
56 | #include "ssh2.h" | |
57 | #include "compat.h" | |
7368a6c8 | 58 | #include "channels.h" |
a306f2dd | 59 | #include "key.h" |
4c8722d9 | 60 | #include "authfd.h" |
a306f2dd | 61 | #include "authfile.h" |
8efc0c15 | 62 | |
f601d847 | 63 | #ifdef HAVE___PROGNAME |
64 | extern char *__progname; | |
260d427b | 65 | #else |
66 | char *__progname; | |
67 | #endif | |
f601d847 | 68 | |
48e671d5 | 69 | /* Flag indicating whether IPv4 or IPv6. This can be set on the command line. |
70 | Default value is AF_UNSPEC means both IPv4 and IPv6. */ | |
59e76f33 | 71 | #ifdef IPV4_DEFAULT |
72 | int IPv4or6 = AF_INET; | |
73 | #else | |
48e671d5 | 74 | int IPv4or6 = AF_UNSPEC; |
59e76f33 | 75 | #endif |
48e671d5 | 76 | |
5260325f | 77 | /* Flag indicating whether debug mode is on. This can be set on the command line. */ |
8efc0c15 | 78 | int debug_flag = 0; |
79 | ||
a8be9f80 | 80 | /* Flag indicating whether a tty should be allocated */ |
8efc0c15 | 81 | int tty_flag = 0; |
8abcdba4 | 82 | int no_tty_flag = 0; |
83 | int force_tty_flag = 0; | |
8efc0c15 | 84 | |
8ce64345 | 85 | /* don't exec a shell */ |
86 | int no_shell_flag = 0; | |
8ce64345 | 87 | |
aa3378df | 88 | /* |
89 | * Flag indicating that nothing should be read from stdin. This can be set | |
90 | * on the command line. | |
91 | */ | |
8efc0c15 | 92 | int stdin_null_flag = 0; |
93 | ||
aa3378df | 94 | /* |
95 | * Flag indicating that ssh should fork after authentication. This is useful | |
96 | * so that the pasphrase can be entered manually, and then ssh goes to the | |
97 | * background. | |
98 | */ | |
8efc0c15 | 99 | int fork_after_authentication_flag = 0; |
100 | ||
aa3378df | 101 | /* |
102 | * General data structure for command line options and options configurable | |
103 | * in configuration files. See readconf.h. | |
104 | */ | |
8efc0c15 | 105 | Options options; |
106 | ||
aa3378df | 107 | /* |
108 | * Name of the host we are connecting to. This is the name given on the | |
109 | * command line, or the HostName specified for the user-supplied name in a | |
110 | * configuration file. | |
111 | */ | |
8efc0c15 | 112 | char *host; |
113 | ||
114 | /* socket address the host resolves to */ | |
48e671d5 | 115 | struct sockaddr_storage hostaddr; |
8efc0c15 | 116 | |
aa3378df | 117 | /* |
118 | * Flag to indicate that we have received a window change signal which has | |
119 | * not yet been processed. This will cause a message indicating the new | |
120 | * window size to be sent to the server a little later. This is volatile | |
121 | * because this is updated in a signal handler. | |
122 | */ | |
8efc0c15 | 123 | volatile int received_window_change_signal = 0; |
124 | ||
8efc0c15 | 125 | /* Flag indicating whether we have a valid host private key loaded. */ |
126 | int host_private_key_loaded = 0; | |
127 | ||
128 | /* Host private key. */ | |
129 | RSA *host_private_key = NULL; | |
130 | ||
131 | /* Original real UID. */ | |
132 | uid_t original_real_uid; | |
133 | ||
8ce64345 | 134 | /* command to be executed */ |
135 | Buffer command; | |
136 | ||
8efc0c15 | 137 | /* Prints a help message to the user. This function never returns. */ |
138 | ||
139 | void | |
140 | usage() | |
141 | { | |
1fe6a48f | 142 | fprintf(stderr, "Usage: %s [options] host [command]\n", __progname); |
5260325f | 143 | fprintf(stderr, "Options:\n"); |
144 | fprintf(stderr, " -l user Log in using this user name.\n"); | |
145 | fprintf(stderr, " -n Redirect input from /dev/null.\n"); | |
71276795 | 146 | fprintf(stderr, " -A Enable authentication agent forwarding.\n"); |
5260325f | 147 | fprintf(stderr, " -a Disable authentication agent forwarding.\n"); |
8efc0c15 | 148 | #ifdef AFS |
5260325f | 149 | fprintf(stderr, " -k Disable Kerberos ticket and AFS token forwarding.\n"); |
150 | #endif /* AFS */ | |
0e73cc53 | 151 | fprintf(stderr, " -X Enable X11 connection forwarding.\n"); |
5260325f | 152 | fprintf(stderr, " -x Disable X11 connection forwarding.\n"); |
153 | fprintf(stderr, " -i file Identity for RSA authentication (default: ~/.ssh/identity).\n"); | |
154 | fprintf(stderr, " -t Tty; allocate a tty even if command is given.\n"); | |
8ce64345 | 155 | fprintf(stderr, " -T Do not allocate a tty.\n"); |
5260325f | 156 | fprintf(stderr, " -v Verbose; display verbose debugging messages.\n"); |
bcbf86ec | 157 | fprintf(stderr, " Multiple -v increases verbosity.\n"); |
5260325f | 158 | fprintf(stderr, " -V Display version number only.\n"); |
159 | fprintf(stderr, " -P Don't allocate a privileged port.\n"); | |
160 | fprintf(stderr, " -q Quiet; don't display any warning messages.\n"); | |
161 | fprintf(stderr, " -f Fork into background after authentication.\n"); | |
162 | fprintf(stderr, " -e char Set escape character; ``none'' = disable (default: ~).\n"); | |
163 | ||
164 | fprintf(stderr, " -c cipher Select encryption algorithm: " | |
165 | "``3des'', " | |
166 | "``blowfish''\n"); | |
167 | fprintf(stderr, " -p port Connect to this port. Server must be on the same port.\n"); | |
168 | fprintf(stderr, " -L listen-port:host:port Forward local port to remote address\n"); | |
169 | fprintf(stderr, " -R listen-port:host:port Forward remote port to local address\n"); | |
1fe6a48f | 170 | fprintf(stderr, " These cause %s to listen for connections on a port, and\n", __progname); |
5260325f | 171 | fprintf(stderr, " forward them to the other side by connecting to host:port.\n"); |
172 | fprintf(stderr, " -C Enable compression.\n"); | |
8ce64345 | 173 | fprintf(stderr, " -N Do not execute a shell or command.\n"); |
5260325f | 174 | fprintf(stderr, " -g Allow remote hosts to connect to forwarded ports.\n"); |
48e671d5 | 175 | fprintf(stderr, " -4 Use IPv4 only.\n"); |
176 | fprintf(stderr, " -6 Use IPv6 only.\n"); | |
6ae2364d | 177 | fprintf(stderr, " -2 Force protocol version 2.\n"); |
5260325f | 178 | fprintf(stderr, " -o 'option' Process the option as if it was read from a configuration file.\n"); |
179 | exit(1); | |
8efc0c15 | 180 | } |
181 | ||
5260325f | 182 | /* |
183 | * Connects to the given host using rsh (or prints an error message and exits | |
184 | * if rsh is not available). This function never returns. | |
185 | */ | |
8efc0c15 | 186 | void |
5260325f | 187 | rsh_connect(char *host, char *user, Buffer * command) |
8efc0c15 | 188 | { |
5260325f | 189 | char *args[10]; |
190 | int i; | |
191 | ||
192 | log("Using rsh. WARNING: Connection will not be encrypted."); | |
193 | /* Build argument list for rsh. */ | |
194 | i = 0; | |
195 | args[i++] = _PATH_RSH; | |
196 | /* host may have to come after user on some systems */ | |
197 | args[i++] = host; | |
198 | if (user) { | |
199 | args[i++] = "-l"; | |
200 | args[i++] = user; | |
201 | } | |
202 | if (buffer_len(command) > 0) { | |
203 | buffer_append(command, "\0", 1); | |
204 | args[i++] = buffer_ptr(command); | |
205 | } | |
206 | args[i++] = NULL; | |
207 | if (debug_flag) { | |
208 | for (i = 0; args[i]; i++) { | |
209 | if (i != 0) | |
210 | fprintf(stderr, " "); | |
211 | fprintf(stderr, "%s", args[i]); | |
212 | } | |
213 | fprintf(stderr, "\n"); | |
8efc0c15 | 214 | } |
5260325f | 215 | execv(_PATH_RSH, args); |
216 | perror(_PATH_RSH); | |
217 | exit(1); | |
8efc0c15 | 218 | } |
219 | ||
fa08c86b | 220 | int ssh_session(void); |
221 | int ssh_session2(void); | |
222 | int guess_identity_file_type(const char *filename); | |
8ce64345 | 223 | |
5260325f | 224 | /* |
225 | * Main program for the ssh client. | |
226 | */ | |
8efc0c15 | 227 | int |
228 | main(int ac, char **av) | |
229 | { | |
8ce64345 | 230 | int i, opt, optind, exit_status, ok; |
57112b5a | 231 | u_short fwd_port, fwd_host_port; |
5260325f | 232 | char *optarg, *cp, buf[256]; |
5260325f | 233 | struct stat st; |
234 | struct passwd *pw, pwcopy; | |
8ce64345 | 235 | int dummy; |
5260325f | 236 | uid_t original_effective_uid; |
5260325f | 237 | |
260d427b | 238 | __progname = get_progname(av[0]); |
264dce47 | 239 | init_rng(); |
240 | ||
aa3378df | 241 | /* |
242 | * Save the original real uid. It will be needed later (uid-swapping | |
243 | * may clobber the real uid). | |
244 | */ | |
5260325f | 245 | original_real_uid = getuid(); |
246 | original_effective_uid = geteuid(); | |
247 | ||
7322ef0e | 248 | #ifdef HAVE_SETRLIMIT |
5260325f | 249 | /* If we are installed setuid root be careful to not drop core. */ |
250 | if (original_real_uid != original_effective_uid) { | |
251 | struct rlimit rlim; | |
252 | rlim.rlim_cur = rlim.rlim_max = 0; | |
253 | if (setrlimit(RLIMIT_CORE, &rlim) < 0) | |
254 | fatal("setrlimit failed: %.100s", strerror(errno)); | |
8efc0c15 | 255 | } |
3c62e7eb | 256 | #endif |
aa3378df | 257 | /* |
258 | * Use uid-swapping to give up root privileges for the duration of | |
259 | * option processing. We will re-instantiate the rights when we are | |
260 | * ready to create the privileged port, and will permanently drop | |
261 | * them when the port has been created (actually, when the connection | |
262 | * has been made, as we may need to create the port several times). | |
263 | */ | |
5260325f | 264 | temporarily_use_uid(original_real_uid); |
265 | ||
aa3378df | 266 | /* |
267 | * Set our umask to something reasonable, as some files are created | |
268 | * with the default umask. This will make them world-readable but | |
269 | * writable only by the owner, which is ok for all files for which we | |
270 | * don't set the modes explicitly. | |
271 | */ | |
5260325f | 272 | umask(022); |
273 | ||
5260325f | 274 | /* Initialize option structure to indicate that no values have been set. */ |
275 | initialize_options(&options); | |
276 | ||
277 | /* Parse command-line arguments. */ | |
278 | host = NULL; | |
279 | ||
280 | /* If program name is not one of the standard names, use it as host name. */ | |
1fe6a48f | 281 | cp = __progname; |
3c62e7eb | 282 | #ifdef HAVE_CYGWIN |
283 | if (strcasecmp(cp, "rsh") && strcasecmp(cp, "ssh") && | |
284 | strcasecmp(cp, "rlogin") && strcasecmp(cp, "slogin") && | |
285 | strcasecmp(cp, "remsh") && | |
286 | strcasecmp(cp, "rsh.exe") && strcasecmp(cp, "ssh.exe") && | |
287 | strcasecmp(cp, "rlogin.exe") && strcasecmp(cp, "slogin.exe") && | |
288 | strcasecmp(cp, "remsh.exe")) | |
289 | #else | |
2e73a022 | 290 | if (strcmp(cp, "rsh") && strcmp(cp, "ssh") && strcmp(cp, "rlogin") && |
291 | strcmp(cp, "slogin") && strcmp(cp, "remsh")) | |
3c62e7eb | 292 | #endif |
5260325f | 293 | host = cp; |
294 | ||
295 | for (optind = 1; optind < ac; optind++) { | |
296 | if (av[optind][0] != '-') { | |
297 | if (host) | |
298 | break; | |
299 | if ((cp = strchr(av[optind], '@'))) { | |
6ae2364d | 300 | if(cp == av[optind]) |
301 | usage(); | |
5260325f | 302 | options.user = av[optind]; |
303 | *cp = '\0'; | |
304 | host = ++cp; | |
305 | } else | |
306 | host = av[optind]; | |
307 | continue; | |
308 | } | |
309 | opt = av[optind][1]; | |
310 | if (!opt) | |
311 | usage(); | |
312 | if (strchr("eilcpLRo", opt)) { /* options with arguments */ | |
313 | optarg = av[optind] + 2; | |
314 | if (strcmp(optarg, "") == 0) { | |
315 | if (optind >= ac - 1) | |
316 | usage(); | |
317 | optarg = av[++optind]; | |
318 | } | |
319 | } else { | |
320 | if (av[optind][2]) | |
321 | usage(); | |
322 | optarg = NULL; | |
323 | } | |
324 | switch (opt) { | |
6ae2364d | 325 | case '2': |
326 | options.protocol = SSH_PROTO_2; | |
327 | break; | |
48e671d5 | 328 | case '4': |
329 | IPv4or6 = AF_INET; | |
330 | break; | |
48e671d5 | 331 | case '6': |
332 | IPv4or6 = AF_INET6; | |
333 | break; | |
5260325f | 334 | case 'n': |
335 | stdin_null_flag = 1; | |
336 | break; | |
5260325f | 337 | case 'f': |
338 | fork_after_authentication_flag = 1; | |
339 | stdin_null_flag = 1; | |
340 | break; | |
5260325f | 341 | case 'x': |
342 | options.forward_x11 = 0; | |
343 | break; | |
5260325f | 344 | case 'X': |
345 | options.forward_x11 = 1; | |
346 | break; | |
5260325f | 347 | case 'g': |
348 | options.gateway_ports = 1; | |
349 | break; | |
5260325f | 350 | case 'P': |
351 | options.use_privileged_port = 0; | |
352 | break; | |
5260325f | 353 | case 'a': |
354 | options.forward_agent = 0; | |
355 | break; | |
71276795 | 356 | case 'A': |
357 | options.forward_agent = 1; | |
358 | break; | |
5260325f | 359 | #ifdef AFS |
360 | case 'k': | |
361 | options.kerberos_tgt_passing = 0; | |
362 | options.afs_token_passing = 0; | |
363 | break; | |
364 | #endif | |
365 | case 'i': | |
366 | if (stat(optarg, &st) < 0) { | |
367 | fprintf(stderr, "Warning: Identity file %s does not exist.\n", | |
fa08c86b | 368 | optarg); |
5260325f | 369 | break; |
370 | } | |
371 | if (options.num_identity_files >= SSH_MAX_IDENTITY_FILES) | |
372 | fatal("Too many identity files specified (max %d)", | |
fa08c86b | 373 | SSH_MAX_IDENTITY_FILES); |
374 | options.identity_files[options.num_identity_files++] = xstrdup(optarg); | |
5260325f | 375 | break; |
5260325f | 376 | case 't': |
8abcdba4 | 377 | if (tty_flag) |
378 | force_tty_flag = 1; | |
5260325f | 379 | tty_flag = 1; |
380 | break; | |
5260325f | 381 | case 'v': |
bcbf86ec | 382 | if (0 == debug_flag) { |
383 | debug_flag = 1; | |
384 | options.log_level = SYSLOG_LEVEL_DEBUG1; | |
385 | } else if (options.log_level < SYSLOG_LEVEL_DEBUG3) { | |
386 | options.log_level++; | |
387 | break; | |
388 | } else { | |
389 | fatal("Too high debugging level.\n"); | |
390 | } | |
391 | /* fallthrough */ | |
5260325f | 392 | case 'V': |
a8be9f80 | 393 | fprintf(stderr, "SSH Version %s, protocol versions %d.%d/%d.%d.\n", |
394 | SSH_VERSION, | |
395 | PROTOCOL_MAJOR_1, PROTOCOL_MINOR_1, | |
396 | PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2); | |
8ce64345 | 397 | fprintf(stderr, "Compiled with SSL (0x%8.8lx).\n", 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; | |
5260325f | 438 | case 'p': |
439 | options.port = atoi(optarg); | |
5260325f | 440 | break; |
5260325f | 441 | case 'l': |
442 | options.user = optarg; | |
443 | break; | |
5260325f | 444 | case 'R': |
48e671d5 | 445 | if (sscanf(optarg, "%hu/%255[^/]/%hu", &fwd_port, buf, |
446 | &fwd_host_port) != 3 && | |
447 | sscanf(optarg, "%hu:%255[^:]:%hu", &fwd_port, buf, | |
448 | &fwd_host_port) != 3) { | |
5260325f | 449 | fprintf(stderr, "Bad forwarding specification '%s'.\n", optarg); |
450 | usage(); | |
451 | /* NOTREACHED */ | |
452 | } | |
453 | add_remote_forward(&options, fwd_port, buf, fwd_host_port); | |
454 | break; | |
5260325f | 455 | case 'L': |
48e671d5 | 456 | if (sscanf(optarg, "%hu/%255[^/]/%hu", &fwd_port, buf, |
457 | &fwd_host_port) != 3 && | |
458 | sscanf(optarg, "%hu:%255[^:]:%hu", &fwd_port, buf, | |
459 | &fwd_host_port) != 3) { | |
5260325f | 460 | fprintf(stderr, "Bad forwarding specification '%s'.\n", optarg); |
461 | usage(); | |
462 | /* NOTREACHED */ | |
463 | } | |
464 | add_local_forward(&options, fwd_port, buf, fwd_host_port); | |
465 | break; | |
5260325f | 466 | case 'C': |
467 | options.compression = 1; | |
468 | break; | |
8ce64345 | 469 | case 'N': |
470 | no_shell_flag = 1; | |
471 | no_tty_flag = 1; | |
472 | break; | |
8ce64345 | 473 | case 'T': |
474 | no_tty_flag = 1; | |
475 | break; | |
5260325f | 476 | case 'o': |
477 | dummy = 1; | |
478 | if (process_config_line(&options, host ? host : "", optarg, | |
479 | "command-line", 0, &dummy) != 0) | |
480 | exit(1); | |
481 | break; | |
5260325f | 482 | default: |
483 | usage(); | |
484 | } | |
485 | } | |
486 | ||
487 | /* Check that we got a host name. */ | |
488 | if (!host) | |
8efc0c15 | 489 | usage(); |
5260325f | 490 | |
22d89d24 | 491 | SSLeay_add_all_algorithms(); |
fa08c86b | 492 | ERR_load_crypto_strings(); |
22d89d24 | 493 | |
5260325f | 494 | /* Initialize the command to execute on remote host. */ |
495 | buffer_init(&command); | |
496 | ||
aa3378df | 497 | /* |
498 | * Save the command to execute on the remote host in a buffer. There | |
499 | * is no limit on the length of the command, except by the maximum | |
500 | * packet size. Also sets the tty flag if there is no command. | |
501 | */ | |
5260325f | 502 | if (optind == ac) { |
503 | /* No command specified - execute shell on a tty. */ | |
504 | tty_flag = 1; | |
505 | } else { | |
506 | /* A command has been specified. Store it into the | |
507 | buffer. */ | |
508 | for (i = optind; i < ac; i++) { | |
509 | if (i > optind) | |
510 | buffer_append(&command, " ", 1); | |
511 | buffer_append(&command, av[i], strlen(av[i])); | |
512 | } | |
8efc0c15 | 513 | } |
5260325f | 514 | |
515 | /* Cannot fork to background if no command. */ | |
14a9a859 | 516 | if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag) |
5260325f | 517 | fatal("Cannot fork into background without a command to execute."); |
518 | ||
519 | /* Allocate a tty by default if no command specified. */ | |
520 | if (buffer_len(&command) == 0) | |
521 | tty_flag = 1; | |
522 | ||
0b6fbf03 | 523 | /* Force no tty*/ |
524 | if (no_tty_flag) | |
525 | tty_flag = 0; | |
5260325f | 526 | /* Do not allocate a tty if stdin is not a tty. */ |
8abcdba4 | 527 | if (!isatty(fileno(stdin)) && !force_tty_flag) { |
5260325f | 528 | if (tty_flag) |
529 | fprintf(stderr, "Pseudo-terminal will not be allocated because stdin is not a terminal.\n"); | |
530 | tty_flag = 0; | |
531 | } | |
8ce64345 | 532 | |
5260325f | 533 | /* Get user data. */ |
534 | pw = getpwuid(original_real_uid); | |
535 | if (!pw) { | |
536 | fprintf(stderr, "You don't exist, go away!\n"); | |
537 | exit(1); | |
538 | } | |
539 | /* Take a copy of the returned structure. */ | |
540 | memset(&pwcopy, 0, sizeof(pwcopy)); | |
541 | pwcopy.pw_name = xstrdup(pw->pw_name); | |
542 | pwcopy.pw_passwd = xstrdup(pw->pw_passwd); | |
543 | pwcopy.pw_uid = pw->pw_uid; | |
544 | pwcopy.pw_gid = pw->pw_gid; | |
2e73a022 | 545 | #ifdef HAVE_PW_CLASS_IN_PASSWD |
546 | pwcopy.pw_class = xstrdup(pw->pw_class); | |
547 | #endif | |
5260325f | 548 | pwcopy.pw_dir = xstrdup(pw->pw_dir); |
549 | pwcopy.pw_shell = xstrdup(pw->pw_shell); | |
550 | pw = &pwcopy; | |
551 | ||
552 | /* Initialize "log" output. Since we are the client all output | |
553 | actually goes to the terminal. */ | |
554 | log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 0); | |
555 | ||
556 | /* Read per-user configuration file. */ | |
557 | snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, SSH_USER_CONFFILE); | |
558 | read_config_file(buf, host, &options); | |
559 | ||
560 | /* Read systemwide configuration file. */ | |
561 | read_config_file(HOST_CONFIG_FILE, host, &options); | |
562 | ||
563 | /* Fill configuration defaults. */ | |
564 | fill_default_options(&options); | |
565 | ||
566 | /* reinit */ | |
567 | log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 0); | |
568 | ||
569 | if (options.user == NULL) | |
570 | options.user = xstrdup(pw->pw_name); | |
571 | ||
572 | if (options.hostname != NULL) | |
573 | host = options.hostname; | |
574 | ||
5260325f | 575 | /* Disable rhosts authentication if not running as root. */ |
3c62e7eb | 576 | #ifdef HAVE_CYGWIN |
577 | /* Ignore uid if running under Windows */ | |
578 | if (!options.use_privileged_port) { | |
579 | #else | |
5260325f | 580 | if (original_effective_uid != 0 || !options.use_privileged_port) { |
3c62e7eb | 581 | #endif |
6ffc9c88 | 582 | debug("Rhosts Authentication disabled, " |
583 | "originating port will not be trusted."); | |
5260325f | 584 | options.rhosts_authentication = 0; |
5260325f | 585 | } |
aa3378df | 586 | /* |
587 | * If using rsh has been selected, exec it now (without trying | |
588 | * anything else). Note that we must release privileges first. | |
589 | */ | |
5260325f | 590 | if (options.use_rsh) { |
aa3378df | 591 | /* |
592 | * Restore our superuser privileges. This must be done | |
593 | * before permanently setting the uid. | |
594 | */ | |
5260325f | 595 | restore_uid(); |
596 | ||
597 | /* Switch to the original uid permanently. */ | |
598 | permanently_set_uid(original_real_uid); | |
599 | ||
600 | /* Execute rsh. */ | |
601 | rsh_connect(host, options.user, &command); | |
602 | fatal("rsh_connect returned"); | |
8efc0c15 | 603 | } |
5260325f | 604 | /* Restore our superuser privileges. */ |
605 | restore_uid(); | |
606 | ||
6ffc9c88 | 607 | /* Open a connection to the remote host. */ |
5260325f | 608 | |
609 | ok = ssh_connect(host, &hostaddr, options.port, | |
6ffc9c88 | 610 | options.connection_attempts, |
611 | original_effective_uid != 0 || !options.use_privileged_port, | |
612 | original_real_uid, | |
613 | options.proxy_command); | |
5260325f | 614 | |
aa3378df | 615 | /* |
616 | * If we successfully made the connection, load the host private key | |
617 | * in case we will need it later for combined rsa-rhosts | |
618 | * authentication. This must be done before releasing extra | |
619 | * privileges, because the file is only readable by root. | |
620 | */ | |
a306f2dd | 621 | if (ok && (options.protocol & SSH_PROTO_1)) { |
622 | Key k; | |
5260325f | 623 | host_private_key = RSA_new(); |
fa08c86b | 624 | k.type = KEY_RSA1; |
a306f2dd | 625 | k.rsa = host_private_key; |
626 | if (load_private_key(HOST_KEY_FILE, "", &k, NULL)) | |
5260325f | 627 | host_private_key_loaded = 1; |
628 | } | |
aa3378df | 629 | /* |
630 | * Get rid of any extra privileges that we may have. We will no | |
631 | * longer need them. Also, extra privileges could make it very hard | |
632 | * to read identity files and other non-world-readable files from the | |
633 | * user's home directory if it happens to be on a NFS volume where | |
634 | * root is mapped to nobody. | |
635 | */ | |
636 | ||
637 | /* | |
638 | * Note that some legacy systems need to postpone the following call | |
639 | * to permanently_set_uid() until the private hostkey is destroyed | |
640 | * with RSA_free(). Otherwise the calling user could ptrace() the | |
641 | * process, read the private hostkey and impersonate the host. | |
642 | * OpenBSD does not allow ptracing of setuid processes. | |
643 | */ | |
5260325f | 644 | permanently_set_uid(original_real_uid); |
645 | ||
aa3378df | 646 | /* |
647 | * Now that we are back to our own permissions, create ~/.ssh | |
648 | * directory if it doesn\'t already exist. | |
649 | */ | |
5260325f | 650 | snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, SSH_USER_DIR); |
651 | if (stat(buf, &st) < 0) | |
704b1659 | 652 | if (mkdir(buf, 0700) < 0) |
5260325f | 653 | error("Could not create directory '%.200s'.", buf); |
654 | ||
655 | /* Check if the connection failed, and try "rsh" if appropriate. */ | |
656 | if (!ok) { | |
657 | if (options.port != 0) | |
57112b5a | 658 | log("Secure connection to %.100s on port %hu refused%.100s.", |
5260325f | 659 | host, options.port, |
660 | options.fallback_to_rsh ? "; reverting to insecure method" : ""); | |
661 | else | |
662 | log("Secure connection to %.100s refused%.100s.", host, | |
663 | options.fallback_to_rsh ? "; reverting to insecure method" : ""); | |
664 | ||
665 | if (options.fallback_to_rsh) { | |
666 | rsh_connect(host, options.user, &command); | |
667 | fatal("rsh_connect returned"); | |
668 | } | |
669 | exit(1); | |
8efc0c15 | 670 | } |
fa08c86b | 671 | /* Expand ~ in options.identity_files, known host file names. */ |
a306f2dd | 672 | /* XXX mem-leaks */ |
fa08c86b | 673 | for (i = 0; i < options.num_identity_files; i++) { |
5260325f | 674 | options.identity_files[i] = |
fa08c86b | 675 | tilde_expand_filename(options.identity_files[i], original_real_uid); |
676 | options.identity_files_type[i] = guess_identity_file_type(options.identity_files[i]); | |
677 | debug("identity file %s type %d", options.identity_files[i], | |
678 | options.identity_files_type[i]); | |
679 | } | |
680 | options.system_hostfile = | |
681 | tilde_expand_filename(options.system_hostfile, original_real_uid); | |
682 | options.user_hostfile = | |
683 | tilde_expand_filename(options.user_hostfile, original_real_uid); | |
684 | options.system_hostfile2 = | |
685 | tilde_expand_filename(options.system_hostfile2, original_real_uid); | |
686 | options.user_hostfile2 = | |
687 | tilde_expand_filename(options.user_hostfile2, original_real_uid); | |
5260325f | 688 | |
689 | /* Log into the remote system. This never returns if the login fails. */ | |
690 | ssh_login(host_private_key_loaded, host_private_key, | |
48e671d5 | 691 | host, (struct sockaddr *)&hostaddr, original_real_uid); |
5260325f | 692 | |
693 | /* We no longer need the host private key. Clear it now. */ | |
694 | if (host_private_key_loaded) | |
695 | RSA_free(host_private_key); /* Destroys contents safely */ | |
696 | ||
8ce64345 | 697 | exit_status = compat20 ? ssh_session2() : ssh_session(); |
698 | packet_close(); | |
699 | return exit_status; | |
700 | } | |
701 | ||
0b242b12 | 702 | void |
703 | x11_get_proto(char *proto, int proto_len, char *data, int data_len) | |
704 | { | |
705 | char line[512]; | |
706 | FILE *f; | |
707 | int got_data = 0, i; | |
708 | ||
fa649821 | 709 | if (options.xauth_location) { |
710 | /* Try to get Xauthority information for the display. */ | |
711 | snprintf(line, sizeof line, "%.100s list %.200s 2>/dev/null", | |
712 | options.xauth_location, getenv("DISPLAY")); | |
713 | f = popen(line, "r"); | |
714 | if (f && fgets(line, sizeof(line), f) && | |
715 | sscanf(line, "%*s %s %s", proto, data) == 2) | |
716 | got_data = 1; | |
717 | if (f) | |
718 | pclose(f); | |
719 | } | |
0b242b12 | 720 | /* |
721 | * If we didn't get authentication data, just make up some | |
722 | * data. The forwarding code will check the validity of the | |
723 | * response anyway, and substitute this data. The X11 | |
724 | * server, however, will ignore this fake data and use | |
725 | * whatever authentication mechanisms it was using otherwise | |
726 | * for the local connection. | |
727 | */ | |
728 | if (!got_data) { | |
729 | u_int32_t rand = 0; | |
730 | ||
731 | strlcpy(proto, "MIT-MAGIC-COOKIE-1", proto_len); | |
732 | for (i = 0; i < 16; i++) { | |
733 | if (i % 4 == 0) | |
734 | rand = arc4random(); | |
735 | snprintf(data + 2 * i, data_len - 2 * i, "%02x", rand & 0xff); | |
736 | rand >>= 8; | |
737 | } | |
738 | } | |
739 | } | |
740 | ||
fa08c86b | 741 | void |
742 | ssh_init_forwarding(void) | |
743 | { | |
744 | int i; | |
745 | /* Initiate local TCP/IP port forwardings. */ | |
746 | for (i = 0; i < options.num_local_forwards; i++) { | |
747 | debug("Connections to local port %d forwarded to remote address %.200s:%d", | |
748 | options.local_forwards[i].port, | |
749 | options.local_forwards[i].host, | |
750 | options.local_forwards[i].host_port); | |
751 | channel_request_local_forwarding( | |
752 | options.local_forwards[i].port, | |
753 | options.local_forwards[i].host, | |
754 | options.local_forwards[i].host_port, | |
755 | options.gateway_ports); | |
756 | } | |
757 | ||
758 | /* Initiate remote TCP/IP port forwardings. */ | |
759 | for (i = 0; i < options.num_remote_forwards; i++) { | |
760 | debug("Connections to remote port %d forwarded to local address %.200s:%d", | |
761 | options.remote_forwards[i].port, | |
762 | options.remote_forwards[i].host, | |
763 | options.remote_forwards[i].host_port); | |
764 | channel_request_remote_forwarding( | |
765 | options.remote_forwards[i].port, | |
766 | options.remote_forwards[i].host, | |
767 | options.remote_forwards[i].host_port); | |
768 | } | |
769 | } | |
770 | ||
771 | void | |
772 | check_agent_present(void) | |
773 | { | |
774 | if (options.forward_agent) { | |
775 | /* Clear agent forwarding if we don\'t have an agent. */ | |
776 | int authfd = ssh_get_authentication_socket(); | |
777 | if (authfd < 0) | |
778 | options.forward_agent = 0; | |
779 | else | |
780 | ssh_close_authentication_socket(authfd); | |
781 | } | |
782 | } | |
783 | ||
8ce64345 | 784 | int |
785 | ssh_session(void) | |
786 | { | |
787 | int type; | |
8ce64345 | 788 | int plen; |
789 | int interactive = 0; | |
790 | int have_tty = 0; | |
791 | struct winsize ws; | |
8ce64345 | 792 | char *cp; |
793 | ||
5260325f | 794 | /* Enable compression if requested. */ |
795 | if (options.compression) { | |
796 | debug("Requesting compression at level %d.", options.compression_level); | |
797 | ||
798 | if (options.compression_level < 1 || options.compression_level > 9) | |
799 | fatal("Compression level must be from 1 (fast) to 9 (slow, best)."); | |
800 | ||
801 | /* Send the request. */ | |
802 | packet_start(SSH_CMSG_REQUEST_COMPRESSION); | |
803 | packet_put_int(options.compression_level); | |
804 | packet_send(); | |
805 | packet_write_wait(); | |
806 | type = packet_read(&plen); | |
807 | if (type == SSH_SMSG_SUCCESS) | |
808 | packet_start_compression(options.compression_level); | |
809 | else if (type == SSH_SMSG_FAILURE) | |
810 | log("Warning: Remote host refused compression."); | |
811 | else | |
812 | packet_disconnect("Protocol error waiting for compression response."); | |
813 | } | |
814 | /* Allocate a pseudo tty if appropriate. */ | |
815 | if (tty_flag) { | |
816 | debug("Requesting pty."); | |
817 | ||
818 | /* Start the packet. */ | |
819 | packet_start(SSH_CMSG_REQUEST_PTY); | |
820 | ||
821 | /* Store TERM in the packet. There is no limit on the | |
822 | length of the string. */ | |
823 | cp = getenv("TERM"); | |
824 | if (!cp) | |
825 | cp = ""; | |
826 | packet_put_string(cp, strlen(cp)); | |
827 | ||
828 | /* Store window size in the packet. */ | |
829 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) | |
830 | memset(&ws, 0, sizeof(ws)); | |
831 | packet_put_int(ws.ws_row); | |
832 | packet_put_int(ws.ws_col); | |
833 | packet_put_int(ws.ws_xpixel); | |
834 | packet_put_int(ws.ws_ypixel); | |
835 | ||
836 | /* Store tty modes in the packet. */ | |
837 | tty_make_modes(fileno(stdin)); | |
838 | ||
839 | /* Send the packet, and wait for it to leave. */ | |
840 | packet_send(); | |
841 | packet_write_wait(); | |
842 | ||
843 | /* Read response from the server. */ | |
844 | type = packet_read(&plen); | |
4fe2af09 | 845 | if (type == SSH_SMSG_SUCCESS) { |
5260325f | 846 | interactive = 1; |
8ce64345 | 847 | have_tty = 1; |
4fe2af09 | 848 | } else if (type == SSH_SMSG_FAILURE) |
5260325f | 849 | log("Warning: Remote host failed or refused to allocate a pseudo tty."); |
850 | else | |
851 | packet_disconnect("Protocol error waiting for pty request response."); | |
852 | } | |
853 | /* Request X11 forwarding if enabled and DISPLAY is set. */ | |
854 | if (options.forward_x11 && getenv("DISPLAY") != NULL) { | |
0b242b12 | 855 | char proto[512], data[512]; |
856 | /* Get reasonable local authentication information. */ | |
857 | x11_get_proto(proto, sizeof proto, data, sizeof data); | |
858 | /* Request forwarding with authentication spoofing. */ | |
5260325f | 859 | debug("Requesting X11 forwarding with authentication spoofing."); |
0b242b12 | 860 | x11_request_forwarding_with_spoofing(0, proto, data); |
5260325f | 861 | |
862 | /* Read response from the server. */ | |
863 | type = packet_read(&plen); | |
864 | if (type == SSH_SMSG_SUCCESS) { | |
5260325f | 865 | interactive = 1; |
0b242b12 | 866 | } else if (type == SSH_SMSG_FAILURE) { |
5260325f | 867 | log("Warning: Remote host denied X11 forwarding."); |
0b242b12 | 868 | } else { |
5260325f | 869 | packet_disconnect("Protocol error waiting for X11 forwarding"); |
0b242b12 | 870 | } |
5260325f | 871 | } |
872 | /* Tell the packet module whether this is an interactive session. */ | |
873 | packet_set_interactive(interactive, options.keepalives); | |
874 | ||
5260325f | 875 | |
876 | /* Request authentication agent forwarding if appropriate. */ | |
fa08c86b | 877 | check_agent_present(); |
878 | ||
5260325f | 879 | if (options.forward_agent) { |
880 | debug("Requesting authentication agent forwarding."); | |
881 | auth_request_forwarding(); | |
882 | ||
883 | /* Read response from the server. */ | |
884 | type = packet_read(&plen); | |
885 | packet_integrity_check(plen, 0, type); | |
886 | if (type != SSH_SMSG_SUCCESS) | |
887 | log("Warning: Remote host denied authentication agent forwarding."); | |
888 | } | |
8efc0c15 | 889 | |
fa08c86b | 890 | /* Initiate port forwardings. */ |
891 | ssh_init_forwarding(); | |
5260325f | 892 | |
aa3378df | 893 | /* If requested, let ssh continue in the background. */ |
6ae2364d | 894 | if (fork_after_authentication_flag) |
aa3378df | 895 | if (daemon(1, 1) < 0) |
896 | fatal("daemon() failed: %.200s", strerror(errno)); | |
897 | ||
898 | /* | |
899 | * If a command was specified on the command line, execute the | |
900 | * command now. Otherwise request the server to start a shell. | |
901 | */ | |
5260325f | 902 | if (buffer_len(&command) > 0) { |
903 | int len = buffer_len(&command); | |
904 | if (len > 900) | |
905 | len = 900; | |
906 | debug("Sending command: %.*s", len, buffer_ptr(&command)); | |
907 | packet_start(SSH_CMSG_EXEC_CMD); | |
908 | packet_put_string(buffer_ptr(&command), buffer_len(&command)); | |
909 | packet_send(); | |
910 | packet_write_wait(); | |
911 | } else { | |
912 | debug("Requesting shell."); | |
913 | packet_start(SSH_CMSG_EXEC_SHELL); | |
914 | packet_send(); | |
915 | packet_write_wait(); | |
916 | } | |
917 | ||
918 | /* Enter the interactive session. */ | |
2e73a022 | 919 | return client_loop(have_tty, tty_flag ? options.escape_char : -1, 0); |
8ce64345 | 920 | } |
5260325f | 921 | |
8ce64345 | 922 | extern void client_set_session_ident(int id); |
923 | ||
924 | void | |
fa08c86b | 925 | ssh_session2_callback(int id, void *arg) |
8ce64345 | 926 | { |
927 | int len; | |
928 | debug("client_init id %d arg %d", id, (int)arg); | |
929 | ||
930 | if (no_shell_flag) | |
931 | goto done; | |
932 | ||
933 | if (tty_flag) { | |
934 | struct winsize ws; | |
935 | char *cp; | |
936 | cp = getenv("TERM"); | |
937 | if (!cp) | |
938 | cp = ""; | |
939 | /* Store window size in the packet. */ | |
940 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) | |
941 | memset(&ws, 0, sizeof(ws)); | |
942 | ||
943 | channel_request_start(id, "pty-req", 0); | |
944 | packet_put_cstring(cp); | |
945 | packet_put_int(ws.ws_col); | |
946 | packet_put_int(ws.ws_row); | |
947 | packet_put_int(ws.ws_xpixel); | |
948 | packet_put_int(ws.ws_ypixel); | |
949 | packet_put_cstring(""); /* XXX: encode terminal modes */ | |
950 | packet_send(); | |
951 | /* XXX wait for reply */ | |
952 | } | |
0b242b12 | 953 | if (options.forward_x11 && |
954 | getenv("DISPLAY") != NULL) { | |
955 | char proto[512], data[512]; | |
956 | /* Get reasonable local authentication information. */ | |
957 | x11_get_proto(proto, sizeof proto, data, sizeof data); | |
958 | /* Request forwarding with authentication spoofing. */ | |
959 | debug("Requesting X11 forwarding with authentication spoofing."); | |
960 | x11_request_forwarding_with_spoofing(id, proto, data); | |
961 | /* XXX wait for reply */ | |
962 | } | |
963 | ||
fa08c86b | 964 | check_agent_present(); |
965 | if (options.forward_agent) { | |
966 | debug("Requesting authentication agent forwarding."); | |
967 | channel_request_start(id, "auth-agent-req@openssh.com", 0); | |
968 | packet_send(); | |
969 | } | |
970 | ||
8ce64345 | 971 | len = buffer_len(&command); |
972 | if (len > 0) { | |
973 | if (len > 900) | |
974 | len = 900; | |
975 | debug("Sending command: %.*s", len, buffer_ptr(&command)); | |
976 | channel_request_start(id, "exec", 0); | |
977 | packet_put_string(buffer_ptr(&command), len); | |
978 | packet_send(); | |
979 | } else { | |
980 | channel_request(id, "shell", 0); | |
981 | } | |
982 | /* channel_callback(id, SSH2_MSG_OPEN_CONFIGMATION, client_init, 0); */ | |
983 | done: | |
984 | /* register different callback, etc. XXX */ | |
985 | client_set_session_ident(id); | |
986 | } | |
987 | ||
988 | int | |
989 | ssh_session2(void) | |
990 | { | |
991 | int window, packetmax, id; | |
2e73a022 | 992 | int in, out, err; |
993 | ||
14a9a859 | 994 | if (stdin_null_flag) { |
995 | in = open("/dev/null", O_RDONLY); | |
996 | } else { | |
997 | in = dup(STDIN_FILENO); | |
998 | } | |
2e73a022 | 999 | out = dup(STDOUT_FILENO); |
1000 | err = dup(STDERR_FILENO); | |
8ce64345 | 1001 | |
1002 | if (in < 0 || out < 0 || err < 0) | |
14a9a859 | 1003 | fatal("dup() in/out/err failed"); |
8ce64345 | 1004 | |
a22aff1f | 1005 | /* enable nonblocking unless tty */ |
1006 | if (!isatty(in)) | |
1007 | set_nonblock(in); | |
1008 | if (!isatty(out)) | |
1009 | set_nonblock(out); | |
1010 | if (!isatty(err)) | |
1011 | set_nonblock(err); | |
1012 | ||
fa08c86b | 1013 | /* XXX should be pre-session */ |
1014 | ssh_init_forwarding(); | |
8ce64345 | 1015 | |
14a9a859 | 1016 | /* If requested, let ssh continue in the background. */ |
1017 | if (fork_after_authentication_flag) | |
1018 | if (daemon(1, 1) < 0) | |
1019 | fatal("daemon() failed: %.200s", strerror(errno)); | |
1020 | ||
bcbf86ec | 1021 | window = CHAN_SES_WINDOW_DEFAULT; |
1022 | packetmax = CHAN_SES_PACKET_DEFAULT; | |
1023 | if (!tty_flag) { | |
8ce64345 | 1024 | window *= 2; |
bcbf86ec | 1025 | packetmax *=2; |
8ce64345 | 1026 | } |
8ce64345 | 1027 | id = channel_new( |
1028 | "session", SSH_CHANNEL_OPENING, in, out, err, | |
bcbf86ec | 1029 | window, packetmax, CHAN_EXTENDED_WRITE, |
a22aff1f | 1030 | xstrdup("client-session"), /*nonblock*/0); |
8ce64345 | 1031 | |
8ce64345 | 1032 | channel_open(id); |
fa08c86b | 1033 | channel_register_callback(id, SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, |
1034 | ssh_session2_callback, (void *)0); | |
5260325f | 1035 | |
2e73a022 | 1036 | return client_loop(tty_flag, tty_flag ? options.escape_char : -1, id); |
8efc0c15 | 1037 | } |
fa08c86b | 1038 | |
1039 | int | |
1040 | guess_identity_file_type(const char *filename) | |
1041 | { | |
1042 | struct stat st; | |
1043 | Key *public; | |
1044 | int type = KEY_RSA1; /* default */ | |
1045 | ||
1046 | if (stat(filename, &st) < 0) { | |
d343d900 | 1047 | /* ignore this key */ |
fa08c86b | 1048 | return KEY_UNSPEC; |
1049 | } | |
1050 | public = key_new(type); | |
1051 | if (!load_public_key(filename, public, NULL)) { | |
1052 | /* ok, so we will assume this is 'some' key */ | |
1053 | type = KEY_UNSPEC; | |
1054 | } | |
1055 | key_free(public); | |
1056 | return type; | |
1057 | } |