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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" | |
0b6fbf03 | 42 | RCSID("$OpenBSD: ssh.c,v 1.75 2000/11/30 07:02:35 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; |
82 | ||
8ce64345 | 83 | /* don't exec a shell */ |
84 | int no_shell_flag = 0; | |
85 | int no_tty_flag = 0; | |
86 | ||
aa3378df | 87 | /* |
88 | * Flag indicating that nothing should be read from stdin. This can be set | |
89 | * on the command line. | |
90 | */ | |
8efc0c15 | 91 | int stdin_null_flag = 0; |
92 | ||
aa3378df | 93 | /* |
94 | * Flag indicating that ssh should fork after authentication. This is useful | |
95 | * so that the pasphrase can be entered manually, and then ssh goes to the | |
96 | * background. | |
97 | */ | |
8efc0c15 | 98 | int fork_after_authentication_flag = 0; |
99 | ||
aa3378df | 100 | /* |
101 | * General data structure for command line options and options configurable | |
102 | * in configuration files. See readconf.h. | |
103 | */ | |
8efc0c15 | 104 | Options options; |
105 | ||
aa3378df | 106 | /* |
107 | * Name of the host we are connecting to. This is the name given on the | |
108 | * command line, or the HostName specified for the user-supplied name in a | |
109 | * configuration file. | |
110 | */ | |
8efc0c15 | 111 | char *host; |
112 | ||
113 | /* socket address the host resolves to */ | |
48e671d5 | 114 | struct sockaddr_storage hostaddr; |
8efc0c15 | 115 | |
aa3378df | 116 | /* |
117 | * Flag to indicate that we have received a window change signal which has | |
118 | * not yet been processed. This will cause a message indicating the new | |
119 | * window size to be sent to the server a little later. This is volatile | |
120 | * because this is updated in a signal handler. | |
121 | */ | |
8efc0c15 | 122 | volatile int received_window_change_signal = 0; |
123 | ||
124 | /* Value of argv[0] (set in the main program). */ | |
125 | char *av0; | |
126 | ||
127 | /* Flag indicating whether we have a valid host private key loaded. */ | |
128 | int host_private_key_loaded = 0; | |
129 | ||
130 | /* Host private key. */ | |
131 | RSA *host_private_key = NULL; | |
132 | ||
133 | /* Original real UID. */ | |
134 | uid_t original_real_uid; | |
135 | ||
8ce64345 | 136 | /* command to be executed */ |
137 | Buffer command; | |
138 | ||
8efc0c15 | 139 | /* Prints a help message to the user. This function never returns. */ |
140 | ||
141 | void | |
142 | usage() | |
143 | { | |
5260325f | 144 | fprintf(stderr, "Usage: %s [options] host [command]\n", av0); |
145 | fprintf(stderr, "Options:\n"); | |
146 | fprintf(stderr, " -l user Log in using this user name.\n"); | |
147 | fprintf(stderr, " -n Redirect input from /dev/null.\n"); | |
71276795 | 148 | fprintf(stderr, " -A Enable authentication agent forwarding.\n"); |
5260325f | 149 | fprintf(stderr, " -a Disable authentication agent forwarding.\n"); |
8efc0c15 | 150 | #ifdef AFS |
5260325f | 151 | fprintf(stderr, " -k Disable Kerberos ticket and AFS token forwarding.\n"); |
152 | #endif /* AFS */ | |
0e73cc53 | 153 | fprintf(stderr, " -X Enable X11 connection forwarding.\n"); |
5260325f | 154 | fprintf(stderr, " -x Disable X11 connection forwarding.\n"); |
155 | fprintf(stderr, " -i file Identity for RSA authentication (default: ~/.ssh/identity).\n"); | |
156 | fprintf(stderr, " -t Tty; allocate a tty even if command is given.\n"); | |
8ce64345 | 157 | fprintf(stderr, " -T Do not allocate a tty.\n"); |
5260325f | 158 | fprintf(stderr, " -v Verbose; display verbose debugging messages.\n"); |
bcbf86ec | 159 | fprintf(stderr, " Multiple -v increases verbosity.\n"); |
5260325f | 160 | fprintf(stderr, " -V Display version number only.\n"); |
161 | fprintf(stderr, " -P Don't allocate a privileged port.\n"); | |
162 | fprintf(stderr, " -q Quiet; don't display any warning messages.\n"); | |
163 | fprintf(stderr, " -f Fork into background after authentication.\n"); | |
164 | fprintf(stderr, " -e char Set escape character; ``none'' = disable (default: ~).\n"); | |
165 | ||
166 | fprintf(stderr, " -c cipher Select encryption algorithm: " | |
167 | "``3des'', " | |
168 | "``blowfish''\n"); | |
169 | fprintf(stderr, " -p port Connect to this port. Server must be on the same port.\n"); | |
170 | fprintf(stderr, " -L listen-port:host:port Forward local port to remote address\n"); | |
171 | fprintf(stderr, " -R listen-port:host:port Forward remote port to local address\n"); | |
172 | fprintf(stderr, " These cause %s to listen for connections on a port, and\n", av0); | |
173 | fprintf(stderr, " forward them to the other side by connecting to host:port.\n"); | |
174 | fprintf(stderr, " -C Enable compression.\n"); | |
8ce64345 | 175 | fprintf(stderr, " -N Do not execute a shell or command.\n"); |
5260325f | 176 | fprintf(stderr, " -g Allow remote hosts to connect to forwarded ports.\n"); |
48e671d5 | 177 | fprintf(stderr, " -4 Use IPv4 only.\n"); |
178 | fprintf(stderr, " -6 Use IPv6 only.\n"); | |
6ae2364d | 179 | fprintf(stderr, " -2 Force protocol version 2.\n"); |
5260325f | 180 | fprintf(stderr, " -o 'option' Process the option as if it was read from a configuration file.\n"); |
181 | exit(1); | |
8efc0c15 | 182 | } |
183 | ||
5260325f | 184 | /* |
185 | * Connects to the given host using rsh (or prints an error message and exits | |
186 | * if rsh is not available). This function never returns. | |
187 | */ | |
8efc0c15 | 188 | void |
5260325f | 189 | rsh_connect(char *host, char *user, Buffer * command) |
8efc0c15 | 190 | { |
5260325f | 191 | char *args[10]; |
192 | int i; | |
193 | ||
194 | log("Using rsh. WARNING: Connection will not be encrypted."); | |
195 | /* Build argument list for rsh. */ | |
196 | i = 0; | |
197 | args[i++] = _PATH_RSH; | |
198 | /* host may have to come after user on some systems */ | |
199 | args[i++] = host; | |
200 | if (user) { | |
201 | args[i++] = "-l"; | |
202 | args[i++] = user; | |
203 | } | |
204 | if (buffer_len(command) > 0) { | |
205 | buffer_append(command, "\0", 1); | |
206 | args[i++] = buffer_ptr(command); | |
207 | } | |
208 | args[i++] = NULL; | |
209 | if (debug_flag) { | |
210 | for (i = 0; args[i]; i++) { | |
211 | if (i != 0) | |
212 | fprintf(stderr, " "); | |
213 | fprintf(stderr, "%s", args[i]); | |
214 | } | |
215 | fprintf(stderr, "\n"); | |
8efc0c15 | 216 | } |
5260325f | 217 | execv(_PATH_RSH, args); |
218 | perror(_PATH_RSH); | |
219 | exit(1); | |
8efc0c15 | 220 | } |
221 | ||
fa08c86b | 222 | int ssh_session(void); |
223 | int ssh_session2(void); | |
224 | int guess_identity_file_type(const char *filename); | |
8ce64345 | 225 | |
5260325f | 226 | /* |
227 | * Main program for the ssh client. | |
228 | */ | |
8efc0c15 | 229 | int |
230 | main(int ac, char **av) | |
231 | { | |
8ce64345 | 232 | int i, opt, optind, exit_status, ok; |
57112b5a | 233 | u_short fwd_port, fwd_host_port; |
5260325f | 234 | char *optarg, *cp, buf[256]; |
5260325f | 235 | struct stat st; |
236 | struct passwd *pw, pwcopy; | |
8ce64345 | 237 | int dummy; |
5260325f | 238 | uid_t original_effective_uid; |
5260325f | 239 | |
260d427b | 240 | __progname = get_progname(av[0]); |
264dce47 | 241 | init_rng(); |
242 | ||
aa3378df | 243 | /* |
244 | * Save the original real uid. It will be needed later (uid-swapping | |
245 | * may clobber the real uid). | |
246 | */ | |
5260325f | 247 | original_real_uid = getuid(); |
248 | original_effective_uid = geteuid(); | |
249 | ||
7322ef0e | 250 | #ifdef HAVE_SETRLIMIT |
5260325f | 251 | /* If we are installed setuid root be careful to not drop core. */ |
252 | if (original_real_uid != original_effective_uid) { | |
253 | struct rlimit rlim; | |
254 | rlim.rlim_cur = rlim.rlim_max = 0; | |
255 | if (setrlimit(RLIMIT_CORE, &rlim) < 0) | |
256 | fatal("setrlimit failed: %.100s", strerror(errno)); | |
8efc0c15 | 257 | } |
3c62e7eb | 258 | #endif |
aa3378df | 259 | /* |
260 | * Use uid-swapping to give up root privileges for the duration of | |
261 | * option processing. We will re-instantiate the rights when we are | |
262 | * ready to create the privileged port, and will permanently drop | |
263 | * them when the port has been created (actually, when the connection | |
264 | * has been made, as we may need to create the port several times). | |
265 | */ | |
5260325f | 266 | temporarily_use_uid(original_real_uid); |
267 | ||
aa3378df | 268 | /* |
269 | * Set our umask to something reasonable, as some files are created | |
270 | * with the default umask. This will make them world-readable but | |
271 | * writable only by the owner, which is ok for all files for which we | |
272 | * don't set the modes explicitly. | |
273 | */ | |
5260325f | 274 | umask(022); |
275 | ||
276 | /* Save our own name. */ | |
277 | av0 = av[0]; | |
278 | ||
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. */ | |
286 | if (strchr(av0, '/')) | |
287 | cp = strrchr(av0, '/') + 1; | |
288 | else | |
289 | cp = av0; | |
3c62e7eb | 290 | #ifdef HAVE_CYGWIN |
291 | if (strcasecmp(cp, "rsh") && strcasecmp(cp, "ssh") && | |
292 | strcasecmp(cp, "rlogin") && strcasecmp(cp, "slogin") && | |
293 | strcasecmp(cp, "remsh") && | |
294 | strcasecmp(cp, "rsh.exe") && strcasecmp(cp, "ssh.exe") && | |
295 | strcasecmp(cp, "rlogin.exe") && strcasecmp(cp, "slogin.exe") && | |
296 | strcasecmp(cp, "remsh.exe")) | |
297 | #else | |
2e73a022 | 298 | if (strcmp(cp, "rsh") && strcmp(cp, "ssh") && strcmp(cp, "rlogin") && |
299 | strcmp(cp, "slogin") && strcmp(cp, "remsh")) | |
3c62e7eb | 300 | #endif |
5260325f | 301 | host = cp; |
302 | ||
303 | for (optind = 1; optind < ac; optind++) { | |
304 | if (av[optind][0] != '-') { | |
305 | if (host) | |
306 | break; | |
307 | if ((cp = strchr(av[optind], '@'))) { | |
6ae2364d | 308 | if(cp == av[optind]) |
309 | usage(); | |
5260325f | 310 | options.user = av[optind]; |
311 | *cp = '\0'; | |
312 | host = ++cp; | |
313 | } else | |
314 | host = av[optind]; | |
315 | continue; | |
316 | } | |
317 | opt = av[optind][1]; | |
318 | if (!opt) | |
319 | usage(); | |
320 | if (strchr("eilcpLRo", opt)) { /* options with arguments */ | |
321 | optarg = av[optind] + 2; | |
322 | if (strcmp(optarg, "") == 0) { | |
323 | if (optind >= ac - 1) | |
324 | usage(); | |
325 | optarg = av[++optind]; | |
326 | } | |
327 | } else { | |
328 | if (av[optind][2]) | |
329 | usage(); | |
330 | optarg = NULL; | |
331 | } | |
332 | switch (opt) { | |
6ae2364d | 333 | case '2': |
334 | options.protocol = SSH_PROTO_2; | |
335 | break; | |
48e671d5 | 336 | case '4': |
337 | IPv4or6 = AF_INET; | |
338 | break; | |
48e671d5 | 339 | case '6': |
340 | IPv4or6 = AF_INET6; | |
341 | break; | |
5260325f | 342 | case 'n': |
343 | stdin_null_flag = 1; | |
344 | break; | |
5260325f | 345 | case 'f': |
346 | fork_after_authentication_flag = 1; | |
347 | stdin_null_flag = 1; | |
348 | break; | |
5260325f | 349 | case 'x': |
350 | options.forward_x11 = 0; | |
351 | break; | |
5260325f | 352 | case 'X': |
353 | options.forward_x11 = 1; | |
354 | break; | |
5260325f | 355 | case 'g': |
356 | options.gateway_ports = 1; | |
357 | break; | |
5260325f | 358 | case 'P': |
359 | options.use_privileged_port = 0; | |
360 | break; | |
5260325f | 361 | case 'a': |
362 | options.forward_agent = 0; | |
363 | break; | |
71276795 | 364 | case 'A': |
365 | options.forward_agent = 1; | |
366 | break; | |
5260325f | 367 | #ifdef AFS |
368 | case 'k': | |
369 | options.kerberos_tgt_passing = 0; | |
370 | options.afs_token_passing = 0; | |
371 | break; | |
372 | #endif | |
373 | case 'i': | |
374 | if (stat(optarg, &st) < 0) { | |
375 | fprintf(stderr, "Warning: Identity file %s does not exist.\n", | |
fa08c86b | 376 | optarg); |
5260325f | 377 | break; |
378 | } | |
379 | if (options.num_identity_files >= SSH_MAX_IDENTITY_FILES) | |
380 | fatal("Too many identity files specified (max %d)", | |
fa08c86b | 381 | SSH_MAX_IDENTITY_FILES); |
382 | options.identity_files[options.num_identity_files++] = xstrdup(optarg); | |
5260325f | 383 | break; |
5260325f | 384 | case 't': |
385 | tty_flag = 1; | |
386 | break; | |
5260325f | 387 | case 'v': |
bcbf86ec | 388 | if (0 == debug_flag) { |
389 | debug_flag = 1; | |
390 | options.log_level = SYSLOG_LEVEL_DEBUG1; | |
391 | } else if (options.log_level < SYSLOG_LEVEL_DEBUG3) { | |
392 | options.log_level++; | |
393 | break; | |
394 | } else { | |
395 | fatal("Too high debugging level.\n"); | |
396 | } | |
397 | /* fallthrough */ | |
5260325f | 398 | case 'V': |
a8be9f80 | 399 | fprintf(stderr, "SSH Version %s, protocol versions %d.%d/%d.%d.\n", |
400 | SSH_VERSION, | |
401 | PROTOCOL_MAJOR_1, PROTOCOL_MINOR_1, | |
402 | PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2); | |
8ce64345 | 403 | fprintf(stderr, "Compiled with SSL (0x%8.8lx).\n", SSLeay()); |
5260325f | 404 | if (opt == 'V') |
405 | exit(0); | |
5260325f | 406 | break; |
5260325f | 407 | case 'q': |
408 | options.log_level = SYSLOG_LEVEL_QUIET; | |
409 | break; | |
5260325f | 410 | case 'e': |
411 | if (optarg[0] == '^' && optarg[2] == 0 && | |
412 | (unsigned char) optarg[1] >= 64 && (unsigned char) optarg[1] < 128) | |
413 | options.escape_char = (unsigned char) optarg[1] & 31; | |
414 | else if (strlen(optarg) == 1) | |
415 | options.escape_char = (unsigned char) optarg[0]; | |
416 | else if (strcmp(optarg, "none") == 0) | |
417 | options.escape_char = -2; | |
418 | else { | |
419 | fprintf(stderr, "Bad escape character '%s'.\n", optarg); | |
420 | exit(1); | |
421 | } | |
422 | break; | |
5260325f | 423 | case 'c': |
a306f2dd | 424 | if (ciphers_valid(optarg)) { |
425 | /* SSH2 only */ | |
426 | options.ciphers = xstrdup(optarg); | |
d0c832f3 | 427 | options.cipher = SSH_CIPHER_ILLEGAL; |
a306f2dd | 428 | } else { |
429 | /* SSH1 only */ | |
c523303b | 430 | options.cipher = cipher_number(optarg); |
431 | if (options.cipher == -1) { | |
a306f2dd | 432 | fprintf(stderr, "Unknown cipher type '%s'\n", optarg); |
433 | exit(1); | |
434 | } | |
c523303b | 435 | if (options.cipher == SSH_CIPHER_3DES) { |
436 | options.ciphers = "3des-cbc"; | |
437 | } else if (options.cipher == SSH_CIPHER_BLOWFISH) { | |
438 | options.ciphers = "blowfish-cbc"; | |
439 | } else { | |
440 | options.ciphers = (char *)-1; | |
441 | } | |
5260325f | 442 | } |
443 | break; | |
5260325f | 444 | case 'p': |
445 | options.port = atoi(optarg); | |
5260325f | 446 | break; |
5260325f | 447 | case 'l': |
448 | options.user = optarg; | |
449 | break; | |
5260325f | 450 | case 'R': |
48e671d5 | 451 | if (sscanf(optarg, "%hu/%255[^/]/%hu", &fwd_port, buf, |
452 | &fwd_host_port) != 3 && | |
453 | sscanf(optarg, "%hu:%255[^:]:%hu", &fwd_port, buf, | |
454 | &fwd_host_port) != 3) { | |
5260325f | 455 | fprintf(stderr, "Bad forwarding specification '%s'.\n", optarg); |
456 | usage(); | |
457 | /* NOTREACHED */ | |
458 | } | |
459 | add_remote_forward(&options, fwd_port, buf, fwd_host_port); | |
460 | break; | |
5260325f | 461 | case 'L': |
48e671d5 | 462 | if (sscanf(optarg, "%hu/%255[^/]/%hu", &fwd_port, buf, |
463 | &fwd_host_port) != 3 && | |
464 | sscanf(optarg, "%hu:%255[^:]:%hu", &fwd_port, buf, | |
465 | &fwd_host_port) != 3) { | |
5260325f | 466 | fprintf(stderr, "Bad forwarding specification '%s'.\n", optarg); |
467 | usage(); | |
468 | /* NOTREACHED */ | |
469 | } | |
470 | add_local_forward(&options, fwd_port, buf, fwd_host_port); | |
471 | break; | |
5260325f | 472 | case 'C': |
473 | options.compression = 1; | |
474 | break; | |
8ce64345 | 475 | case 'N': |
476 | no_shell_flag = 1; | |
477 | no_tty_flag = 1; | |
478 | break; | |
8ce64345 | 479 | case 'T': |
480 | no_tty_flag = 1; | |
481 | break; | |
5260325f | 482 | case 'o': |
483 | dummy = 1; | |
484 | if (process_config_line(&options, host ? host : "", optarg, | |
485 | "command-line", 0, &dummy) != 0) | |
486 | exit(1); | |
487 | break; | |
5260325f | 488 | default: |
489 | usage(); | |
490 | } | |
491 | } | |
492 | ||
493 | /* Check that we got a host name. */ | |
494 | if (!host) | |
8efc0c15 | 495 | usage(); |
5260325f | 496 | |
22d89d24 | 497 | SSLeay_add_all_algorithms(); |
fa08c86b | 498 | ERR_load_crypto_strings(); |
22d89d24 | 499 | |
5260325f | 500 | /* Initialize the command to execute on remote host. */ |
501 | buffer_init(&command); | |
502 | ||
aa3378df | 503 | /* |
504 | * Save the command to execute on the remote host in a buffer. There | |
505 | * is no limit on the length of the command, except by the maximum | |
506 | * packet size. Also sets the tty flag if there is no command. | |
507 | */ | |
5260325f | 508 | if (optind == ac) { |
509 | /* No command specified - execute shell on a tty. */ | |
510 | tty_flag = 1; | |
511 | } else { | |
512 | /* A command has been specified. Store it into the | |
513 | buffer. */ | |
514 | for (i = optind; i < ac; i++) { | |
515 | if (i > optind) | |
516 | buffer_append(&command, " ", 1); | |
517 | buffer_append(&command, av[i], strlen(av[i])); | |
518 | } | |
8efc0c15 | 519 | } |
5260325f | 520 | |
521 | /* Cannot fork to background if no command. */ | |
14a9a859 | 522 | if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag) |
5260325f | 523 | fatal("Cannot fork into background without a command to execute."); |
524 | ||
525 | /* Allocate a tty by default if no command specified. */ | |
526 | if (buffer_len(&command) == 0) | |
527 | tty_flag = 1; | |
528 | ||
0b6fbf03 | 529 | /* Force no tty*/ |
530 | if (no_tty_flag) | |
531 | tty_flag = 0; | |
5260325f | 532 | /* Do not allocate a tty if stdin is not a tty. */ |
533 | if (!isatty(fileno(stdin))) { | |
534 | if (tty_flag) | |
535 | fprintf(stderr, "Pseudo-terminal will not be allocated because stdin is not a terminal.\n"); | |
536 | tty_flag = 0; | |
537 | } | |
8ce64345 | 538 | |
5260325f | 539 | /* Get user data. */ |
540 | pw = getpwuid(original_real_uid); | |
541 | if (!pw) { | |
542 | fprintf(stderr, "You don't exist, go away!\n"); | |
543 | exit(1); | |
544 | } | |
545 | /* Take a copy of the returned structure. */ | |
546 | memset(&pwcopy, 0, sizeof(pwcopy)); | |
547 | pwcopy.pw_name = xstrdup(pw->pw_name); | |
548 | pwcopy.pw_passwd = xstrdup(pw->pw_passwd); | |
549 | pwcopy.pw_uid = pw->pw_uid; | |
550 | pwcopy.pw_gid = pw->pw_gid; | |
2e73a022 | 551 | #ifdef HAVE_PW_CLASS_IN_PASSWD |
552 | pwcopy.pw_class = xstrdup(pw->pw_class); | |
553 | #endif | |
5260325f | 554 | pwcopy.pw_dir = xstrdup(pw->pw_dir); |
555 | pwcopy.pw_shell = xstrdup(pw->pw_shell); | |
556 | pw = &pwcopy; | |
557 | ||
558 | /* Initialize "log" output. Since we are the client all output | |
559 | actually goes to the terminal. */ | |
560 | log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 0); | |
561 | ||
562 | /* Read per-user configuration file. */ | |
563 | snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, SSH_USER_CONFFILE); | |
564 | read_config_file(buf, host, &options); | |
565 | ||
566 | /* Read systemwide configuration file. */ | |
567 | read_config_file(HOST_CONFIG_FILE, host, &options); | |
568 | ||
569 | /* Fill configuration defaults. */ | |
570 | fill_default_options(&options); | |
571 | ||
572 | /* reinit */ | |
573 | log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 0); | |
574 | ||
575 | if (options.user == NULL) | |
576 | options.user = xstrdup(pw->pw_name); | |
577 | ||
578 | if (options.hostname != NULL) | |
579 | host = options.hostname; | |
580 | ||
5260325f | 581 | /* Disable rhosts authentication if not running as root. */ |
3c62e7eb | 582 | #ifdef HAVE_CYGWIN |
583 | /* Ignore uid if running under Windows */ | |
584 | if (!options.use_privileged_port) { | |
585 | #else | |
5260325f | 586 | if (original_effective_uid != 0 || !options.use_privileged_port) { |
fa08c86b | 587 | debug("Rhosts Authentication methods disabled, " |
588 | "originating port will not be trusted."); | |
3c62e7eb | 589 | #endif |
5260325f | 590 | options.rhosts_authentication = 0; |
591 | options.rhosts_rsa_authentication = 0; | |
592 | } | |
aa3378df | 593 | /* |
594 | * If using rsh has been selected, exec it now (without trying | |
595 | * anything else). Note that we must release privileges first. | |
596 | */ | |
5260325f | 597 | if (options.use_rsh) { |
aa3378df | 598 | /* |
599 | * Restore our superuser privileges. This must be done | |
600 | * before permanently setting the uid. | |
601 | */ | |
5260325f | 602 | restore_uid(); |
603 | ||
604 | /* Switch to the original uid permanently. */ | |
605 | permanently_set_uid(original_real_uid); | |
606 | ||
607 | /* Execute rsh. */ | |
608 | rsh_connect(host, options.user, &command); | |
609 | fatal("rsh_connect returned"); | |
8efc0c15 | 610 | } |
5260325f | 611 | /* Restore our superuser privileges. */ |
612 | restore_uid(); | |
613 | ||
aa3378df | 614 | /* |
615 | * Open a connection to the remote host. This needs root privileges | |
616 | * if rhosts_{rsa_}authentication is enabled. | |
617 | */ | |
5260325f | 618 | |
619 | ok = ssh_connect(host, &hostaddr, options.port, | |
620 | options.connection_attempts, | |
621 | !options.rhosts_authentication && | |
622 | !options.rhosts_rsa_authentication, | |
623 | original_real_uid, | |
624 | options.proxy_command); | |
625 | ||
aa3378df | 626 | /* |
627 | * If we successfully made the connection, load the host private key | |
628 | * in case we will need it later for combined rsa-rhosts | |
629 | * authentication. This must be done before releasing extra | |
630 | * privileges, because the file is only readable by root. | |
631 | */ | |
a306f2dd | 632 | if (ok && (options.protocol & SSH_PROTO_1)) { |
633 | Key k; | |
5260325f | 634 | host_private_key = RSA_new(); |
fa08c86b | 635 | k.type = KEY_RSA1; |
a306f2dd | 636 | k.rsa = host_private_key; |
637 | if (load_private_key(HOST_KEY_FILE, "", &k, NULL)) | |
5260325f | 638 | host_private_key_loaded = 1; |
639 | } | |
aa3378df | 640 | /* |
641 | * Get rid of any extra privileges that we may have. We will no | |
642 | * longer need them. Also, extra privileges could make it very hard | |
643 | * to read identity files and other non-world-readable files from the | |
644 | * user's home directory if it happens to be on a NFS volume where | |
645 | * root is mapped to nobody. | |
646 | */ | |
647 | ||
648 | /* | |
649 | * Note that some legacy systems need to postpone the following call | |
650 | * to permanently_set_uid() until the private hostkey is destroyed | |
651 | * with RSA_free(). Otherwise the calling user could ptrace() the | |
652 | * process, read the private hostkey and impersonate the host. | |
653 | * OpenBSD does not allow ptracing of setuid processes. | |
654 | */ | |
5260325f | 655 | permanently_set_uid(original_real_uid); |
656 | ||
aa3378df | 657 | /* |
658 | * Now that we are back to our own permissions, create ~/.ssh | |
659 | * directory if it doesn\'t already exist. | |
660 | */ | |
5260325f | 661 | snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, SSH_USER_DIR); |
662 | if (stat(buf, &st) < 0) | |
704b1659 | 663 | if (mkdir(buf, 0700) < 0) |
5260325f | 664 | error("Could not create directory '%.200s'.", buf); |
665 | ||
666 | /* Check if the connection failed, and try "rsh" if appropriate. */ | |
667 | if (!ok) { | |
668 | if (options.port != 0) | |
57112b5a | 669 | log("Secure connection to %.100s on port %hu refused%.100s.", |
5260325f | 670 | host, options.port, |
671 | options.fallback_to_rsh ? "; reverting to insecure method" : ""); | |
672 | else | |
673 | log("Secure connection to %.100s refused%.100s.", host, | |
674 | options.fallback_to_rsh ? "; reverting to insecure method" : ""); | |
675 | ||
676 | if (options.fallback_to_rsh) { | |
677 | rsh_connect(host, options.user, &command); | |
678 | fatal("rsh_connect returned"); | |
679 | } | |
680 | exit(1); | |
8efc0c15 | 681 | } |
fa08c86b | 682 | /* Expand ~ in options.identity_files, known host file names. */ |
a306f2dd | 683 | /* XXX mem-leaks */ |
fa08c86b | 684 | for (i = 0; i < options.num_identity_files; i++) { |
5260325f | 685 | options.identity_files[i] = |
fa08c86b | 686 | tilde_expand_filename(options.identity_files[i], original_real_uid); |
687 | options.identity_files_type[i] = guess_identity_file_type(options.identity_files[i]); | |
688 | debug("identity file %s type %d", options.identity_files[i], | |
689 | options.identity_files_type[i]); | |
690 | } | |
691 | options.system_hostfile = | |
692 | tilde_expand_filename(options.system_hostfile, original_real_uid); | |
693 | options.user_hostfile = | |
694 | tilde_expand_filename(options.user_hostfile, original_real_uid); | |
695 | options.system_hostfile2 = | |
696 | tilde_expand_filename(options.system_hostfile2, original_real_uid); | |
697 | options.user_hostfile2 = | |
698 | tilde_expand_filename(options.user_hostfile2, original_real_uid); | |
5260325f | 699 | |
700 | /* Log into the remote system. This never returns if the login fails. */ | |
701 | ssh_login(host_private_key_loaded, host_private_key, | |
48e671d5 | 702 | host, (struct sockaddr *)&hostaddr, original_real_uid); |
5260325f | 703 | |
704 | /* We no longer need the host private key. Clear it now. */ | |
705 | if (host_private_key_loaded) | |
706 | RSA_free(host_private_key); /* Destroys contents safely */ | |
707 | ||
8ce64345 | 708 | exit_status = compat20 ? ssh_session2() : ssh_session(); |
709 | packet_close(); | |
710 | return exit_status; | |
711 | } | |
712 | ||
0b242b12 | 713 | void |
714 | x11_get_proto(char *proto, int proto_len, char *data, int data_len) | |
715 | { | |
716 | char line[512]; | |
717 | FILE *f; | |
718 | int got_data = 0, i; | |
719 | ||
fa649821 | 720 | if (options.xauth_location) { |
721 | /* Try to get Xauthority information for the display. */ | |
722 | snprintf(line, sizeof line, "%.100s list %.200s 2>/dev/null", | |
723 | options.xauth_location, getenv("DISPLAY")); | |
724 | f = popen(line, "r"); | |
725 | if (f && fgets(line, sizeof(line), f) && | |
726 | sscanf(line, "%*s %s %s", proto, data) == 2) | |
727 | got_data = 1; | |
728 | if (f) | |
729 | pclose(f); | |
730 | } | |
0b242b12 | 731 | /* |
732 | * If we didn't get authentication data, just make up some | |
733 | * data. The forwarding code will check the validity of the | |
734 | * response anyway, and substitute this data. The X11 | |
735 | * server, however, will ignore this fake data and use | |
736 | * whatever authentication mechanisms it was using otherwise | |
737 | * for the local connection. | |
738 | */ | |
739 | if (!got_data) { | |
740 | u_int32_t rand = 0; | |
741 | ||
742 | strlcpy(proto, "MIT-MAGIC-COOKIE-1", proto_len); | |
743 | for (i = 0; i < 16; i++) { | |
744 | if (i % 4 == 0) | |
745 | rand = arc4random(); | |
746 | snprintf(data + 2 * i, data_len - 2 * i, "%02x", rand & 0xff); | |
747 | rand >>= 8; | |
748 | } | |
749 | } | |
750 | } | |
751 | ||
fa08c86b | 752 | void |
753 | ssh_init_forwarding(void) | |
754 | { | |
755 | int i; | |
756 | /* Initiate local TCP/IP port forwardings. */ | |
757 | for (i = 0; i < options.num_local_forwards; i++) { | |
758 | debug("Connections to local port %d forwarded to remote address %.200s:%d", | |
759 | options.local_forwards[i].port, | |
760 | options.local_forwards[i].host, | |
761 | options.local_forwards[i].host_port); | |
762 | channel_request_local_forwarding( | |
763 | options.local_forwards[i].port, | |
764 | options.local_forwards[i].host, | |
765 | options.local_forwards[i].host_port, | |
766 | options.gateway_ports); | |
767 | } | |
768 | ||
769 | /* Initiate remote TCP/IP port forwardings. */ | |
770 | for (i = 0; i < options.num_remote_forwards; i++) { | |
771 | debug("Connections to remote port %d forwarded to local address %.200s:%d", | |
772 | options.remote_forwards[i].port, | |
773 | options.remote_forwards[i].host, | |
774 | options.remote_forwards[i].host_port); | |
775 | channel_request_remote_forwarding( | |
776 | options.remote_forwards[i].port, | |
777 | options.remote_forwards[i].host, | |
778 | options.remote_forwards[i].host_port); | |
779 | } | |
780 | } | |
781 | ||
782 | void | |
783 | check_agent_present(void) | |
784 | { | |
785 | if (options.forward_agent) { | |
786 | /* Clear agent forwarding if we don\'t have an agent. */ | |
787 | int authfd = ssh_get_authentication_socket(); | |
788 | if (authfd < 0) | |
789 | options.forward_agent = 0; | |
790 | else | |
791 | ssh_close_authentication_socket(authfd); | |
792 | } | |
793 | } | |
794 | ||
8ce64345 | 795 | int |
796 | ssh_session(void) | |
797 | { | |
798 | int type; | |
8ce64345 | 799 | int plen; |
800 | int interactive = 0; | |
801 | int have_tty = 0; | |
802 | struct winsize ws; | |
8ce64345 | 803 | char *cp; |
804 | ||
5260325f | 805 | /* Enable compression if requested. */ |
806 | if (options.compression) { | |
807 | debug("Requesting compression at level %d.", options.compression_level); | |
808 | ||
809 | if (options.compression_level < 1 || options.compression_level > 9) | |
810 | fatal("Compression level must be from 1 (fast) to 9 (slow, best)."); | |
811 | ||
812 | /* Send the request. */ | |
813 | packet_start(SSH_CMSG_REQUEST_COMPRESSION); | |
814 | packet_put_int(options.compression_level); | |
815 | packet_send(); | |
816 | packet_write_wait(); | |
817 | type = packet_read(&plen); | |
818 | if (type == SSH_SMSG_SUCCESS) | |
819 | packet_start_compression(options.compression_level); | |
820 | else if (type == SSH_SMSG_FAILURE) | |
821 | log("Warning: Remote host refused compression."); | |
822 | else | |
823 | packet_disconnect("Protocol error waiting for compression response."); | |
824 | } | |
825 | /* Allocate a pseudo tty if appropriate. */ | |
826 | if (tty_flag) { | |
827 | debug("Requesting pty."); | |
828 | ||
829 | /* Start the packet. */ | |
830 | packet_start(SSH_CMSG_REQUEST_PTY); | |
831 | ||
832 | /* Store TERM in the packet. There is no limit on the | |
833 | length of the string. */ | |
834 | cp = getenv("TERM"); | |
835 | if (!cp) | |
836 | cp = ""; | |
837 | packet_put_string(cp, strlen(cp)); | |
838 | ||
839 | /* Store window size in the packet. */ | |
840 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) | |
841 | memset(&ws, 0, sizeof(ws)); | |
842 | packet_put_int(ws.ws_row); | |
843 | packet_put_int(ws.ws_col); | |
844 | packet_put_int(ws.ws_xpixel); | |
845 | packet_put_int(ws.ws_ypixel); | |
846 | ||
847 | /* Store tty modes in the packet. */ | |
848 | tty_make_modes(fileno(stdin)); | |
849 | ||
850 | /* Send the packet, and wait for it to leave. */ | |
851 | packet_send(); | |
852 | packet_write_wait(); | |
853 | ||
854 | /* Read response from the server. */ | |
855 | type = packet_read(&plen); | |
4fe2af09 | 856 | if (type == SSH_SMSG_SUCCESS) { |
5260325f | 857 | interactive = 1; |
8ce64345 | 858 | have_tty = 1; |
4fe2af09 | 859 | } else if (type == SSH_SMSG_FAILURE) |
5260325f | 860 | log("Warning: Remote host failed or refused to allocate a pseudo tty."); |
861 | else | |
862 | packet_disconnect("Protocol error waiting for pty request response."); | |
863 | } | |
864 | /* Request X11 forwarding if enabled and DISPLAY is set. */ | |
865 | if (options.forward_x11 && getenv("DISPLAY") != NULL) { | |
0b242b12 | 866 | char proto[512], data[512]; |
867 | /* Get reasonable local authentication information. */ | |
868 | x11_get_proto(proto, sizeof proto, data, sizeof data); | |
869 | /* Request forwarding with authentication spoofing. */ | |
5260325f | 870 | debug("Requesting X11 forwarding with authentication spoofing."); |
0b242b12 | 871 | x11_request_forwarding_with_spoofing(0, proto, data); |
5260325f | 872 | |
873 | /* Read response from the server. */ | |
874 | type = packet_read(&plen); | |
875 | if (type == SSH_SMSG_SUCCESS) { | |
5260325f | 876 | interactive = 1; |
0b242b12 | 877 | } else if (type == SSH_SMSG_FAILURE) { |
5260325f | 878 | log("Warning: Remote host denied X11 forwarding."); |
0b242b12 | 879 | } else { |
5260325f | 880 | packet_disconnect("Protocol error waiting for X11 forwarding"); |
0b242b12 | 881 | } |
5260325f | 882 | } |
883 | /* Tell the packet module whether this is an interactive session. */ | |
884 | packet_set_interactive(interactive, options.keepalives); | |
885 | ||
5260325f | 886 | |
887 | /* Request authentication agent forwarding if appropriate. */ | |
fa08c86b | 888 | check_agent_present(); |
889 | ||
5260325f | 890 | if (options.forward_agent) { |
891 | debug("Requesting authentication agent forwarding."); | |
892 | auth_request_forwarding(); | |
893 | ||
894 | /* Read response from the server. */ | |
895 | type = packet_read(&plen); | |
896 | packet_integrity_check(plen, 0, type); | |
897 | if (type != SSH_SMSG_SUCCESS) | |
898 | log("Warning: Remote host denied authentication agent forwarding."); | |
899 | } | |
8efc0c15 | 900 | |
fa08c86b | 901 | /* Initiate port forwardings. */ |
902 | ssh_init_forwarding(); | |
5260325f | 903 | |
aa3378df | 904 | /* If requested, let ssh continue in the background. */ |
6ae2364d | 905 | if (fork_after_authentication_flag) |
aa3378df | 906 | if (daemon(1, 1) < 0) |
907 | fatal("daemon() failed: %.200s", strerror(errno)); | |
908 | ||
909 | /* | |
910 | * If a command was specified on the command line, execute the | |
911 | * command now. Otherwise request the server to start a shell. | |
912 | */ | |
5260325f | 913 | if (buffer_len(&command) > 0) { |
914 | int len = buffer_len(&command); | |
915 | if (len > 900) | |
916 | len = 900; | |
917 | debug("Sending command: %.*s", len, buffer_ptr(&command)); | |
918 | packet_start(SSH_CMSG_EXEC_CMD); | |
919 | packet_put_string(buffer_ptr(&command), buffer_len(&command)); | |
920 | packet_send(); | |
921 | packet_write_wait(); | |
922 | } else { | |
923 | debug("Requesting shell."); | |
924 | packet_start(SSH_CMSG_EXEC_SHELL); | |
925 | packet_send(); | |
926 | packet_write_wait(); | |
927 | } | |
928 | ||
929 | /* Enter the interactive session. */ | |
2e73a022 | 930 | return client_loop(have_tty, tty_flag ? options.escape_char : -1, 0); |
8ce64345 | 931 | } |
5260325f | 932 | |
8ce64345 | 933 | extern void client_set_session_ident(int id); |
934 | ||
935 | void | |
fa08c86b | 936 | ssh_session2_callback(int id, void *arg) |
8ce64345 | 937 | { |
938 | int len; | |
939 | debug("client_init id %d arg %d", id, (int)arg); | |
940 | ||
941 | if (no_shell_flag) | |
942 | goto done; | |
943 | ||
944 | if (tty_flag) { | |
945 | struct winsize ws; | |
946 | char *cp; | |
947 | cp = getenv("TERM"); | |
948 | if (!cp) | |
949 | cp = ""; | |
950 | /* Store window size in the packet. */ | |
951 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) | |
952 | memset(&ws, 0, sizeof(ws)); | |
953 | ||
954 | channel_request_start(id, "pty-req", 0); | |
955 | packet_put_cstring(cp); | |
956 | packet_put_int(ws.ws_col); | |
957 | packet_put_int(ws.ws_row); | |
958 | packet_put_int(ws.ws_xpixel); | |
959 | packet_put_int(ws.ws_ypixel); | |
960 | packet_put_cstring(""); /* XXX: encode terminal modes */ | |
961 | packet_send(); | |
962 | /* XXX wait for reply */ | |
963 | } | |
0b242b12 | 964 | if (options.forward_x11 && |
965 | getenv("DISPLAY") != NULL) { | |
966 | char proto[512], data[512]; | |
967 | /* Get reasonable local authentication information. */ | |
968 | x11_get_proto(proto, sizeof proto, data, sizeof data); | |
969 | /* Request forwarding with authentication spoofing. */ | |
970 | debug("Requesting X11 forwarding with authentication spoofing."); | |
971 | x11_request_forwarding_with_spoofing(id, proto, data); | |
972 | /* XXX wait for reply */ | |
973 | } | |
974 | ||
fa08c86b | 975 | check_agent_present(); |
976 | if (options.forward_agent) { | |
977 | debug("Requesting authentication agent forwarding."); | |
978 | channel_request_start(id, "auth-agent-req@openssh.com", 0); | |
979 | packet_send(); | |
980 | } | |
981 | ||
8ce64345 | 982 | len = buffer_len(&command); |
983 | if (len > 0) { | |
984 | if (len > 900) | |
985 | len = 900; | |
986 | debug("Sending command: %.*s", len, buffer_ptr(&command)); | |
987 | channel_request_start(id, "exec", 0); | |
988 | packet_put_string(buffer_ptr(&command), len); | |
989 | packet_send(); | |
990 | } else { | |
991 | channel_request(id, "shell", 0); | |
992 | } | |
993 | /* channel_callback(id, SSH2_MSG_OPEN_CONFIGMATION, client_init, 0); */ | |
994 | done: | |
995 | /* register different callback, etc. XXX */ | |
996 | client_set_session_ident(id); | |
997 | } | |
998 | ||
999 | int | |
1000 | ssh_session2(void) | |
1001 | { | |
1002 | int window, packetmax, id; | |
2e73a022 | 1003 | int in, out, err; |
1004 | ||
14a9a859 | 1005 | if (stdin_null_flag) { |
1006 | in = open("/dev/null", O_RDONLY); | |
1007 | } else { | |
1008 | in = dup(STDIN_FILENO); | |
1009 | } | |
2e73a022 | 1010 | out = dup(STDOUT_FILENO); |
1011 | err = dup(STDERR_FILENO); | |
8ce64345 | 1012 | |
1013 | if (in < 0 || out < 0 || err < 0) | |
14a9a859 | 1014 | fatal("dup() in/out/err failed"); |
8ce64345 | 1015 | |
a22aff1f | 1016 | /* enable nonblocking unless tty */ |
1017 | if (!isatty(in)) | |
1018 | set_nonblock(in); | |
1019 | if (!isatty(out)) | |
1020 | set_nonblock(out); | |
1021 | if (!isatty(err)) | |
1022 | set_nonblock(err); | |
1023 | ||
fa08c86b | 1024 | /* XXX should be pre-session */ |
1025 | ssh_init_forwarding(); | |
8ce64345 | 1026 | |
14a9a859 | 1027 | /* If requested, let ssh continue in the background. */ |
1028 | if (fork_after_authentication_flag) | |
1029 | if (daemon(1, 1) < 0) | |
1030 | fatal("daemon() failed: %.200s", strerror(errno)); | |
1031 | ||
bcbf86ec | 1032 | window = CHAN_SES_WINDOW_DEFAULT; |
1033 | packetmax = CHAN_SES_PACKET_DEFAULT; | |
1034 | if (!tty_flag) { | |
8ce64345 | 1035 | window *= 2; |
bcbf86ec | 1036 | packetmax *=2; |
8ce64345 | 1037 | } |
8ce64345 | 1038 | id = channel_new( |
1039 | "session", SSH_CHANNEL_OPENING, in, out, err, | |
bcbf86ec | 1040 | window, packetmax, CHAN_EXTENDED_WRITE, |
a22aff1f | 1041 | xstrdup("client-session"), /*nonblock*/0); |
8ce64345 | 1042 | |
8ce64345 | 1043 | channel_open(id); |
fa08c86b | 1044 | channel_register_callback(id, SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, |
1045 | ssh_session2_callback, (void *)0); | |
5260325f | 1046 | |
2e73a022 | 1047 | return client_loop(tty_flag, tty_flag ? options.escape_char : -1, id); |
8efc0c15 | 1048 | } |
fa08c86b | 1049 | |
1050 | int | |
1051 | guess_identity_file_type(const char *filename) | |
1052 | { | |
1053 | struct stat st; | |
1054 | Key *public; | |
1055 | int type = KEY_RSA1; /* default */ | |
1056 | ||
1057 | if (stat(filename, &st) < 0) { | |
d343d900 | 1058 | /* ignore this key */ |
fa08c86b | 1059 | return KEY_UNSPEC; |
1060 | } | |
1061 | public = key_new(type); | |
1062 | if (!load_public_key(filename, public, NULL)) { | |
1063 | /* ok, so we will assume this is 'some' key */ | |
1064 | type = KEY_UNSPEC; | |
1065 | } | |
1066 | key_free(public); | |
1067 | return type; | |
1068 | } |