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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" | |
fa08c86b | 42 | RCSID("$OpenBSD: ssh.c,v 1.72 2000/11/12 19:50:38 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; | |
65 | #else /* HAVE___PROGNAME */ | |
3fd95d9a | 66 | static const char *__progname = "ssh"; |
f601d847 | 67 | #endif /* HAVE___PROGNAME */ |
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 | |
264dce47 | 240 | init_rng(); |
241 | ||
aa3378df | 242 | /* |
243 | * Save the original real uid. It will be needed later (uid-swapping | |
244 | * may clobber the real uid). | |
245 | */ | |
5260325f | 246 | original_real_uid = getuid(); |
247 | original_effective_uid = geteuid(); | |
248 | ||
7322ef0e | 249 | #ifdef HAVE_SETRLIMIT |
5260325f | 250 | /* If we are installed setuid root be careful to not drop core. */ |
251 | if (original_real_uid != original_effective_uid) { | |
252 | struct rlimit rlim; | |
253 | rlim.rlim_cur = rlim.rlim_max = 0; | |
254 | if (setrlimit(RLIMIT_CORE, &rlim) < 0) | |
255 | fatal("setrlimit failed: %.100s", strerror(errno)); | |
8efc0c15 | 256 | } |
3c62e7eb | 257 | #endif |
aa3378df | 258 | /* |
259 | * Use uid-swapping to give up root privileges for the duration of | |
260 | * option processing. We will re-instantiate the rights when we are | |
261 | * ready to create the privileged port, and will permanently drop | |
262 | * them when the port has been created (actually, when the connection | |
263 | * has been made, as we may need to create the port several times). | |
264 | */ | |
5260325f | 265 | temporarily_use_uid(original_real_uid); |
266 | ||
aa3378df | 267 | /* |
268 | * Set our umask to something reasonable, as some files are created | |
269 | * with the default umask. This will make them world-readable but | |
270 | * writable only by the owner, which is ok for all files for which we | |
271 | * don't set the modes explicitly. | |
272 | */ | |
5260325f | 273 | umask(022); |
274 | ||
275 | /* Save our own name. */ | |
276 | av0 = av[0]; | |
277 | ||
278 | /* Initialize option structure to indicate that no values have been set. */ | |
279 | initialize_options(&options); | |
280 | ||
281 | /* Parse command-line arguments. */ | |
282 | host = NULL; | |
283 | ||
284 | /* If program name is not one of the standard names, use it as host name. */ | |
285 | if (strchr(av0, '/')) | |
286 | cp = strrchr(av0, '/') + 1; | |
287 | else | |
288 | cp = av0; | |
3c62e7eb | 289 | #ifdef HAVE_CYGWIN |
290 | if (strcasecmp(cp, "rsh") && strcasecmp(cp, "ssh") && | |
291 | strcasecmp(cp, "rlogin") && strcasecmp(cp, "slogin") && | |
292 | strcasecmp(cp, "remsh") && | |
293 | strcasecmp(cp, "rsh.exe") && strcasecmp(cp, "ssh.exe") && | |
294 | strcasecmp(cp, "rlogin.exe") && strcasecmp(cp, "slogin.exe") && | |
295 | strcasecmp(cp, "remsh.exe")) | |
296 | #else | |
2e73a022 | 297 | if (strcmp(cp, "rsh") && strcmp(cp, "ssh") && strcmp(cp, "rlogin") && |
298 | strcmp(cp, "slogin") && strcmp(cp, "remsh")) | |
3c62e7eb | 299 | #endif |
5260325f | 300 | host = cp; |
301 | ||
302 | for (optind = 1; optind < ac; optind++) { | |
303 | if (av[optind][0] != '-') { | |
304 | if (host) | |
305 | break; | |
306 | if ((cp = strchr(av[optind], '@'))) { | |
6ae2364d | 307 | if(cp == av[optind]) |
308 | usage(); | |
5260325f | 309 | options.user = av[optind]; |
310 | *cp = '\0'; | |
311 | host = ++cp; | |
312 | } else | |
313 | host = av[optind]; | |
314 | continue; | |
315 | } | |
316 | opt = av[optind][1]; | |
317 | if (!opt) | |
318 | usage(); | |
319 | if (strchr("eilcpLRo", opt)) { /* options with arguments */ | |
320 | optarg = av[optind] + 2; | |
321 | if (strcmp(optarg, "") == 0) { | |
322 | if (optind >= ac - 1) | |
323 | usage(); | |
324 | optarg = av[++optind]; | |
325 | } | |
326 | } else { | |
327 | if (av[optind][2]) | |
328 | usage(); | |
329 | optarg = NULL; | |
330 | } | |
331 | switch (opt) { | |
6ae2364d | 332 | case '2': |
333 | options.protocol = SSH_PROTO_2; | |
334 | break; | |
48e671d5 | 335 | case '4': |
336 | IPv4or6 = AF_INET; | |
337 | break; | |
48e671d5 | 338 | case '6': |
339 | IPv4or6 = AF_INET6; | |
340 | break; | |
5260325f | 341 | case 'n': |
342 | stdin_null_flag = 1; | |
343 | break; | |
5260325f | 344 | case 'f': |
345 | fork_after_authentication_flag = 1; | |
346 | stdin_null_flag = 1; | |
347 | break; | |
5260325f | 348 | case 'x': |
349 | options.forward_x11 = 0; | |
350 | break; | |
5260325f | 351 | case 'X': |
352 | options.forward_x11 = 1; | |
353 | break; | |
5260325f | 354 | case 'g': |
355 | options.gateway_ports = 1; | |
356 | break; | |
5260325f | 357 | case 'P': |
358 | options.use_privileged_port = 0; | |
359 | break; | |
5260325f | 360 | case 'a': |
361 | options.forward_agent = 0; | |
362 | break; | |
71276795 | 363 | case 'A': |
364 | options.forward_agent = 1; | |
365 | break; | |
5260325f | 366 | #ifdef AFS |
367 | case 'k': | |
368 | options.kerberos_tgt_passing = 0; | |
369 | options.afs_token_passing = 0; | |
370 | break; | |
371 | #endif | |
372 | case 'i': | |
373 | if (stat(optarg, &st) < 0) { | |
374 | fprintf(stderr, "Warning: Identity file %s does not exist.\n", | |
fa08c86b | 375 | optarg); |
5260325f | 376 | break; |
377 | } | |
378 | if (options.num_identity_files >= SSH_MAX_IDENTITY_FILES) | |
379 | fatal("Too many identity files specified (max %d)", | |
fa08c86b | 380 | SSH_MAX_IDENTITY_FILES); |
381 | options.identity_files[options.num_identity_files++] = xstrdup(optarg); | |
5260325f | 382 | break; |
5260325f | 383 | case 't': |
384 | tty_flag = 1; | |
385 | break; | |
5260325f | 386 | case 'v': |
bcbf86ec | 387 | if (0 == debug_flag) { |
388 | debug_flag = 1; | |
389 | options.log_level = SYSLOG_LEVEL_DEBUG1; | |
390 | } else if (options.log_level < SYSLOG_LEVEL_DEBUG3) { | |
391 | options.log_level++; | |
392 | break; | |
393 | } else { | |
394 | fatal("Too high debugging level.\n"); | |
395 | } | |
396 | /* fallthrough */ | |
5260325f | 397 | case 'V': |
a8be9f80 | 398 | fprintf(stderr, "SSH Version %s, protocol versions %d.%d/%d.%d.\n", |
399 | SSH_VERSION, | |
400 | PROTOCOL_MAJOR_1, PROTOCOL_MINOR_1, | |
401 | PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2); | |
8ce64345 | 402 | fprintf(stderr, "Compiled with SSL (0x%8.8lx).\n", SSLeay()); |
5260325f | 403 | if (opt == 'V') |
404 | exit(0); | |
5260325f | 405 | break; |
5260325f | 406 | case 'q': |
407 | options.log_level = SYSLOG_LEVEL_QUIET; | |
408 | break; | |
5260325f | 409 | case 'e': |
410 | if (optarg[0] == '^' && optarg[2] == 0 && | |
411 | (unsigned char) optarg[1] >= 64 && (unsigned char) optarg[1] < 128) | |
412 | options.escape_char = (unsigned char) optarg[1] & 31; | |
413 | else if (strlen(optarg) == 1) | |
414 | options.escape_char = (unsigned char) optarg[0]; | |
415 | else if (strcmp(optarg, "none") == 0) | |
416 | options.escape_char = -2; | |
417 | else { | |
418 | fprintf(stderr, "Bad escape character '%s'.\n", optarg); | |
419 | exit(1); | |
420 | } | |
421 | break; | |
5260325f | 422 | case 'c': |
a306f2dd | 423 | if (ciphers_valid(optarg)) { |
424 | /* SSH2 only */ | |
425 | options.ciphers = xstrdup(optarg); | |
d0c832f3 | 426 | options.cipher = SSH_CIPHER_ILLEGAL; |
a306f2dd | 427 | } else { |
428 | /* SSH1 only */ | |
94ec8c6b | 429 | Cipher *c = cipher_by_name(optarg); |
430 | if (c == NULL || c->number < 0) { | |
a306f2dd | 431 | fprintf(stderr, "Unknown cipher type '%s'\n", optarg); |
432 | exit(1); | |
433 | } | |
94ec8c6b | 434 | options.cipher = c->number; |
5260325f | 435 | } |
436 | break; | |
5260325f | 437 | case 'p': |
438 | options.port = atoi(optarg); | |
5260325f | 439 | break; |
5260325f | 440 | case 'l': |
441 | options.user = optarg; | |
442 | break; | |
5260325f | 443 | case 'R': |
48e671d5 | 444 | if (sscanf(optarg, "%hu/%255[^/]/%hu", &fwd_port, buf, |
445 | &fwd_host_port) != 3 && | |
446 | sscanf(optarg, "%hu:%255[^:]:%hu", &fwd_port, buf, | |
447 | &fwd_host_port) != 3) { | |
5260325f | 448 | fprintf(stderr, "Bad forwarding specification '%s'.\n", optarg); |
449 | usage(); | |
450 | /* NOTREACHED */ | |
451 | } | |
452 | add_remote_forward(&options, fwd_port, buf, fwd_host_port); | |
453 | break; | |
5260325f | 454 | case 'L': |
48e671d5 | 455 | if (sscanf(optarg, "%hu/%255[^/]/%hu", &fwd_port, buf, |
456 | &fwd_host_port) != 3 && | |
457 | sscanf(optarg, "%hu:%255[^:]:%hu", &fwd_port, buf, | |
458 | &fwd_host_port) != 3) { | |
5260325f | 459 | fprintf(stderr, "Bad forwarding specification '%s'.\n", optarg); |
460 | usage(); | |
461 | /* NOTREACHED */ | |
462 | } | |
463 | add_local_forward(&options, fwd_port, buf, fwd_host_port); | |
464 | break; | |
5260325f | 465 | case 'C': |
466 | options.compression = 1; | |
467 | break; | |
8ce64345 | 468 | case 'N': |
469 | no_shell_flag = 1; | |
470 | no_tty_flag = 1; | |
471 | break; | |
8ce64345 | 472 | case 'T': |
473 | no_tty_flag = 1; | |
474 | break; | |
5260325f | 475 | case 'o': |
476 | dummy = 1; | |
477 | if (process_config_line(&options, host ? host : "", optarg, | |
478 | "command-line", 0, &dummy) != 0) | |
479 | exit(1); | |
480 | break; | |
5260325f | 481 | default: |
482 | usage(); | |
483 | } | |
484 | } | |
485 | ||
486 | /* Check that we got a host name. */ | |
487 | if (!host) | |
8efc0c15 | 488 | usage(); |
5260325f | 489 | |
22d89d24 | 490 | SSLeay_add_all_algorithms(); |
fa08c86b | 491 | ERR_load_crypto_strings(); |
22d89d24 | 492 | |
5260325f | 493 | /* Initialize the command to execute on remote host. */ |
494 | buffer_init(&command); | |
495 | ||
aa3378df | 496 | /* |
497 | * Save the command to execute on the remote host in a buffer. There | |
498 | * is no limit on the length of the command, except by the maximum | |
499 | * packet size. Also sets the tty flag if there is no command. | |
500 | */ | |
5260325f | 501 | if (optind == ac) { |
502 | /* No command specified - execute shell on a tty. */ | |
503 | tty_flag = 1; | |
504 | } else { | |
505 | /* A command has been specified. Store it into the | |
506 | buffer. */ | |
507 | for (i = optind; i < ac; i++) { | |
508 | if (i > optind) | |
509 | buffer_append(&command, " ", 1); | |
510 | buffer_append(&command, av[i], strlen(av[i])); | |
511 | } | |
8efc0c15 | 512 | } |
5260325f | 513 | |
514 | /* Cannot fork to background if no command. */ | |
14a9a859 | 515 | if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag) |
5260325f | 516 | fatal("Cannot fork into background without a command to execute."); |
517 | ||
518 | /* Allocate a tty by default if no command specified. */ | |
519 | if (buffer_len(&command) == 0) | |
520 | tty_flag = 1; | |
521 | ||
522 | /* Do not allocate a tty if stdin is not a tty. */ | |
523 | if (!isatty(fileno(stdin))) { | |
524 | if (tty_flag) | |
525 | fprintf(stderr, "Pseudo-terminal will not be allocated because stdin is not a terminal.\n"); | |
526 | tty_flag = 0; | |
527 | } | |
8ce64345 | 528 | /* force */ |
529 | if (no_tty_flag) | |
530 | tty_flag = 0; | |
531 | ||
5260325f | 532 | /* Get user data. */ |
533 | pw = getpwuid(original_real_uid); | |
534 | if (!pw) { | |
535 | fprintf(stderr, "You don't exist, go away!\n"); | |
536 | exit(1); | |
537 | } | |
538 | /* Take a copy of the returned structure. */ | |
539 | memset(&pwcopy, 0, sizeof(pwcopy)); | |
540 | pwcopy.pw_name = xstrdup(pw->pw_name); | |
541 | pwcopy.pw_passwd = xstrdup(pw->pw_passwd); | |
542 | pwcopy.pw_uid = pw->pw_uid; | |
543 | pwcopy.pw_gid = pw->pw_gid; | |
2e73a022 | 544 | #ifdef HAVE_PW_CLASS_IN_PASSWD |
545 | pwcopy.pw_class = xstrdup(pw->pw_class); | |
546 | #endif | |
5260325f | 547 | pwcopy.pw_dir = xstrdup(pw->pw_dir); |
548 | pwcopy.pw_shell = xstrdup(pw->pw_shell); | |
549 | pw = &pwcopy; | |
550 | ||
551 | /* Initialize "log" output. Since we are the client all output | |
552 | actually goes to the terminal. */ | |
553 | log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 0); | |
554 | ||
555 | /* Read per-user configuration file. */ | |
556 | snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, SSH_USER_CONFFILE); | |
557 | read_config_file(buf, host, &options); | |
558 | ||
559 | /* Read systemwide configuration file. */ | |
560 | read_config_file(HOST_CONFIG_FILE, host, &options); | |
561 | ||
562 | /* Fill configuration defaults. */ | |
563 | fill_default_options(&options); | |
564 | ||
565 | /* reinit */ | |
566 | log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 0); | |
567 | ||
568 | if (options.user == NULL) | |
569 | options.user = xstrdup(pw->pw_name); | |
570 | ||
571 | if (options.hostname != NULL) | |
572 | host = options.hostname; | |
573 | ||
5260325f | 574 | /* Disable rhosts authentication if not running as root. */ |
3c62e7eb | 575 | #ifdef HAVE_CYGWIN |
576 | /* Ignore uid if running under Windows */ | |
577 | if (!options.use_privileged_port) { | |
578 | #else | |
5260325f | 579 | if (original_effective_uid != 0 || !options.use_privileged_port) { |
fa08c86b | 580 | debug("Rhosts Authentication methods disabled, " |
581 | "originating port will not be trusted."); | |
3c62e7eb | 582 | #endif |
5260325f | 583 | options.rhosts_authentication = 0; |
584 | options.rhosts_rsa_authentication = 0; | |
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 | ||
aa3378df | 607 | /* |
608 | * Open a connection to the remote host. This needs root privileges | |
609 | * if rhosts_{rsa_}authentication is enabled. | |
610 | */ | |
5260325f | 611 | |
612 | ok = ssh_connect(host, &hostaddr, options.port, | |
613 | options.connection_attempts, | |
614 | !options.rhosts_authentication && | |
615 | !options.rhosts_rsa_authentication, | |
616 | original_real_uid, | |
617 | options.proxy_command); | |
618 | ||
aa3378df | 619 | /* |
620 | * If we successfully made the connection, load the host private key | |
621 | * in case we will need it later for combined rsa-rhosts | |
622 | * authentication. This must be done before releasing extra | |
623 | * privileges, because the file is only readable by root. | |
624 | */ | |
a306f2dd | 625 | if (ok && (options.protocol & SSH_PROTO_1)) { |
626 | Key k; | |
5260325f | 627 | host_private_key = RSA_new(); |
fa08c86b | 628 | k.type = KEY_RSA1; |
a306f2dd | 629 | k.rsa = host_private_key; |
630 | if (load_private_key(HOST_KEY_FILE, "", &k, NULL)) | |
5260325f | 631 | host_private_key_loaded = 1; |
632 | } | |
aa3378df | 633 | /* |
634 | * Get rid of any extra privileges that we may have. We will no | |
635 | * longer need them. Also, extra privileges could make it very hard | |
636 | * to read identity files and other non-world-readable files from the | |
637 | * user's home directory if it happens to be on a NFS volume where | |
638 | * root is mapped to nobody. | |
639 | */ | |
640 | ||
641 | /* | |
642 | * Note that some legacy systems need to postpone the following call | |
643 | * to permanently_set_uid() until the private hostkey is destroyed | |
644 | * with RSA_free(). Otherwise the calling user could ptrace() the | |
645 | * process, read the private hostkey and impersonate the host. | |
646 | * OpenBSD does not allow ptracing of setuid processes. | |
647 | */ | |
5260325f | 648 | permanently_set_uid(original_real_uid); |
649 | ||
aa3378df | 650 | /* |
651 | * Now that we are back to our own permissions, create ~/.ssh | |
652 | * directory if it doesn\'t already exist. | |
653 | */ | |
5260325f | 654 | snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, SSH_USER_DIR); |
655 | if (stat(buf, &st) < 0) | |
704b1659 | 656 | if (mkdir(buf, 0700) < 0) |
5260325f | 657 | error("Could not create directory '%.200s'.", buf); |
658 | ||
659 | /* Check if the connection failed, and try "rsh" if appropriate. */ | |
660 | if (!ok) { | |
661 | if (options.port != 0) | |
57112b5a | 662 | log("Secure connection to %.100s on port %hu refused%.100s.", |
5260325f | 663 | host, options.port, |
664 | options.fallback_to_rsh ? "; reverting to insecure method" : ""); | |
665 | else | |
666 | log("Secure connection to %.100s refused%.100s.", host, | |
667 | options.fallback_to_rsh ? "; reverting to insecure method" : ""); | |
668 | ||
669 | if (options.fallback_to_rsh) { | |
670 | rsh_connect(host, options.user, &command); | |
671 | fatal("rsh_connect returned"); | |
672 | } | |
673 | exit(1); | |
8efc0c15 | 674 | } |
fa08c86b | 675 | /* Expand ~ in options.identity_files, known host file names. */ |
a306f2dd | 676 | /* XXX mem-leaks */ |
fa08c86b | 677 | for (i = 0; i < options.num_identity_files; i++) { |
5260325f | 678 | options.identity_files[i] = |
fa08c86b | 679 | tilde_expand_filename(options.identity_files[i], original_real_uid); |
680 | options.identity_files_type[i] = guess_identity_file_type(options.identity_files[i]); | |
681 | debug("identity file %s type %d", options.identity_files[i], | |
682 | options.identity_files_type[i]); | |
683 | } | |
684 | options.system_hostfile = | |
685 | tilde_expand_filename(options.system_hostfile, original_real_uid); | |
686 | options.user_hostfile = | |
687 | tilde_expand_filename(options.user_hostfile, original_real_uid); | |
688 | options.system_hostfile2 = | |
689 | tilde_expand_filename(options.system_hostfile2, original_real_uid); | |
690 | options.user_hostfile2 = | |
691 | tilde_expand_filename(options.user_hostfile2, original_real_uid); | |
5260325f | 692 | |
693 | /* Log into the remote system. This never returns if the login fails. */ | |
694 | ssh_login(host_private_key_loaded, host_private_key, | |
48e671d5 | 695 | host, (struct sockaddr *)&hostaddr, original_real_uid); |
5260325f | 696 | |
697 | /* We no longer need the host private key. Clear it now. */ | |
698 | if (host_private_key_loaded) | |
699 | RSA_free(host_private_key); /* Destroys contents safely */ | |
700 | ||
8ce64345 | 701 | exit_status = compat20 ? ssh_session2() : ssh_session(); |
702 | packet_close(); | |
703 | return exit_status; | |
704 | } | |
705 | ||
0b242b12 | 706 | void |
707 | x11_get_proto(char *proto, int proto_len, char *data, int data_len) | |
708 | { | |
709 | char line[512]; | |
710 | FILE *f; | |
711 | int got_data = 0, i; | |
712 | ||
fa649821 | 713 | if (options.xauth_location) { |
714 | /* Try to get Xauthority information for the display. */ | |
715 | snprintf(line, sizeof line, "%.100s list %.200s 2>/dev/null", | |
716 | options.xauth_location, getenv("DISPLAY")); | |
717 | f = popen(line, "r"); | |
718 | if (f && fgets(line, sizeof(line), f) && | |
719 | sscanf(line, "%*s %s %s", proto, data) == 2) | |
720 | got_data = 1; | |
721 | if (f) | |
722 | pclose(f); | |
723 | } | |
0b242b12 | 724 | /* |
725 | * If we didn't get authentication data, just make up some | |
726 | * data. The forwarding code will check the validity of the | |
727 | * response anyway, and substitute this data. The X11 | |
728 | * server, however, will ignore this fake data and use | |
729 | * whatever authentication mechanisms it was using otherwise | |
730 | * for the local connection. | |
731 | */ | |
732 | if (!got_data) { | |
733 | u_int32_t rand = 0; | |
734 | ||
735 | strlcpy(proto, "MIT-MAGIC-COOKIE-1", proto_len); | |
736 | for (i = 0; i < 16; i++) { | |
737 | if (i % 4 == 0) | |
738 | rand = arc4random(); | |
739 | snprintf(data + 2 * i, data_len - 2 * i, "%02x", rand & 0xff); | |
740 | rand >>= 8; | |
741 | } | |
742 | } | |
743 | } | |
744 | ||
fa08c86b | 745 | void |
746 | ssh_init_forwarding(void) | |
747 | { | |
748 | int i; | |
749 | /* Initiate local TCP/IP port forwardings. */ | |
750 | for (i = 0; i < options.num_local_forwards; i++) { | |
751 | debug("Connections to local port %d forwarded to remote address %.200s:%d", | |
752 | options.local_forwards[i].port, | |
753 | options.local_forwards[i].host, | |
754 | options.local_forwards[i].host_port); | |
755 | channel_request_local_forwarding( | |
756 | options.local_forwards[i].port, | |
757 | options.local_forwards[i].host, | |
758 | options.local_forwards[i].host_port, | |
759 | options.gateway_ports); | |
760 | } | |
761 | ||
762 | /* Initiate remote TCP/IP port forwardings. */ | |
763 | for (i = 0; i < options.num_remote_forwards; i++) { | |
764 | debug("Connections to remote port %d forwarded to local address %.200s:%d", | |
765 | options.remote_forwards[i].port, | |
766 | options.remote_forwards[i].host, | |
767 | options.remote_forwards[i].host_port); | |
768 | channel_request_remote_forwarding( | |
769 | options.remote_forwards[i].port, | |
770 | options.remote_forwards[i].host, | |
771 | options.remote_forwards[i].host_port); | |
772 | } | |
773 | } | |
774 | ||
775 | void | |
776 | check_agent_present(void) | |
777 | { | |
778 | if (options.forward_agent) { | |
779 | /* Clear agent forwarding if we don\'t have an agent. */ | |
780 | int authfd = ssh_get_authentication_socket(); | |
781 | if (authfd < 0) | |
782 | options.forward_agent = 0; | |
783 | else | |
784 | ssh_close_authentication_socket(authfd); | |
785 | } | |
786 | } | |
787 | ||
8ce64345 | 788 | int |
789 | ssh_session(void) | |
790 | { | |
791 | int type; | |
8ce64345 | 792 | int plen; |
793 | int interactive = 0; | |
794 | int have_tty = 0; | |
795 | struct winsize ws; | |
8ce64345 | 796 | char *cp; |
797 | ||
5260325f | 798 | /* Enable compression if requested. */ |
799 | if (options.compression) { | |
800 | debug("Requesting compression at level %d.", options.compression_level); | |
801 | ||
802 | if (options.compression_level < 1 || options.compression_level > 9) | |
803 | fatal("Compression level must be from 1 (fast) to 9 (slow, best)."); | |
804 | ||
805 | /* Send the request. */ | |
806 | packet_start(SSH_CMSG_REQUEST_COMPRESSION); | |
807 | packet_put_int(options.compression_level); | |
808 | packet_send(); | |
809 | packet_write_wait(); | |
810 | type = packet_read(&plen); | |
811 | if (type == SSH_SMSG_SUCCESS) | |
812 | packet_start_compression(options.compression_level); | |
813 | else if (type == SSH_SMSG_FAILURE) | |
814 | log("Warning: Remote host refused compression."); | |
815 | else | |
816 | packet_disconnect("Protocol error waiting for compression response."); | |
817 | } | |
818 | /* Allocate a pseudo tty if appropriate. */ | |
819 | if (tty_flag) { | |
820 | debug("Requesting pty."); | |
821 | ||
822 | /* Start the packet. */ | |
823 | packet_start(SSH_CMSG_REQUEST_PTY); | |
824 | ||
825 | /* Store TERM in the packet. There is no limit on the | |
826 | length of the string. */ | |
827 | cp = getenv("TERM"); | |
828 | if (!cp) | |
829 | cp = ""; | |
830 | packet_put_string(cp, strlen(cp)); | |
831 | ||
832 | /* Store window size in the packet. */ | |
833 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) | |
834 | memset(&ws, 0, sizeof(ws)); | |
835 | packet_put_int(ws.ws_row); | |
836 | packet_put_int(ws.ws_col); | |
837 | packet_put_int(ws.ws_xpixel); | |
838 | packet_put_int(ws.ws_ypixel); | |
839 | ||
840 | /* Store tty modes in the packet. */ | |
841 | tty_make_modes(fileno(stdin)); | |
842 | ||
843 | /* Send the packet, and wait for it to leave. */ | |
844 | packet_send(); | |
845 | packet_write_wait(); | |
846 | ||
847 | /* Read response from the server. */ | |
848 | type = packet_read(&plen); | |
4fe2af09 | 849 | if (type == SSH_SMSG_SUCCESS) { |
5260325f | 850 | interactive = 1; |
8ce64345 | 851 | have_tty = 1; |
4fe2af09 | 852 | } else if (type == SSH_SMSG_FAILURE) |
5260325f | 853 | log("Warning: Remote host failed or refused to allocate a pseudo tty."); |
854 | else | |
855 | packet_disconnect("Protocol error waiting for pty request response."); | |
856 | } | |
857 | /* Request X11 forwarding if enabled and DISPLAY is set. */ | |
858 | if (options.forward_x11 && getenv("DISPLAY") != NULL) { | |
0b242b12 | 859 | char proto[512], data[512]; |
860 | /* Get reasonable local authentication information. */ | |
861 | x11_get_proto(proto, sizeof proto, data, sizeof data); | |
862 | /* Request forwarding with authentication spoofing. */ | |
5260325f | 863 | debug("Requesting X11 forwarding with authentication spoofing."); |
0b242b12 | 864 | x11_request_forwarding_with_spoofing(0, proto, data); |
5260325f | 865 | |
866 | /* Read response from the server. */ | |
867 | type = packet_read(&plen); | |
868 | if (type == SSH_SMSG_SUCCESS) { | |
5260325f | 869 | interactive = 1; |
0b242b12 | 870 | } else if (type == SSH_SMSG_FAILURE) { |
5260325f | 871 | log("Warning: Remote host denied X11 forwarding."); |
0b242b12 | 872 | } else { |
5260325f | 873 | packet_disconnect("Protocol error waiting for X11 forwarding"); |
0b242b12 | 874 | } |
5260325f | 875 | } |
876 | /* Tell the packet module whether this is an interactive session. */ | |
877 | packet_set_interactive(interactive, options.keepalives); | |
878 | ||
5260325f | 879 | |
880 | /* Request authentication agent forwarding if appropriate. */ | |
fa08c86b | 881 | check_agent_present(); |
882 | ||
5260325f | 883 | if (options.forward_agent) { |
884 | debug("Requesting authentication agent forwarding."); | |
885 | auth_request_forwarding(); | |
886 | ||
887 | /* Read response from the server. */ | |
888 | type = packet_read(&plen); | |
889 | packet_integrity_check(plen, 0, type); | |
890 | if (type != SSH_SMSG_SUCCESS) | |
891 | log("Warning: Remote host denied authentication agent forwarding."); | |
892 | } | |
8efc0c15 | 893 | |
fa08c86b | 894 | /* Initiate port forwardings. */ |
895 | ssh_init_forwarding(); | |
5260325f | 896 | |
aa3378df | 897 | /* If requested, let ssh continue in the background. */ |
6ae2364d | 898 | if (fork_after_authentication_flag) |
aa3378df | 899 | if (daemon(1, 1) < 0) |
900 | fatal("daemon() failed: %.200s", strerror(errno)); | |
901 | ||
902 | /* | |
903 | * If a command was specified on the command line, execute the | |
904 | * command now. Otherwise request the server to start a shell. | |
905 | */ | |
5260325f | 906 | if (buffer_len(&command) > 0) { |
907 | int len = buffer_len(&command); | |
908 | if (len > 900) | |
909 | len = 900; | |
910 | debug("Sending command: %.*s", len, buffer_ptr(&command)); | |
911 | packet_start(SSH_CMSG_EXEC_CMD); | |
912 | packet_put_string(buffer_ptr(&command), buffer_len(&command)); | |
913 | packet_send(); | |
914 | packet_write_wait(); | |
915 | } else { | |
916 | debug("Requesting shell."); | |
917 | packet_start(SSH_CMSG_EXEC_SHELL); | |
918 | packet_send(); | |
919 | packet_write_wait(); | |
920 | } | |
921 | ||
922 | /* Enter the interactive session. */ | |
2e73a022 | 923 | return client_loop(have_tty, tty_flag ? options.escape_char : -1, 0); |
8ce64345 | 924 | } |
5260325f | 925 | |
8ce64345 | 926 | extern void client_set_session_ident(int id); |
927 | ||
928 | void | |
fa08c86b | 929 | ssh_session2_callback(int id, void *arg) |
8ce64345 | 930 | { |
931 | int len; | |
932 | debug("client_init id %d arg %d", id, (int)arg); | |
933 | ||
934 | if (no_shell_flag) | |
935 | goto done; | |
936 | ||
937 | if (tty_flag) { | |
938 | struct winsize ws; | |
939 | char *cp; | |
940 | cp = getenv("TERM"); | |
941 | if (!cp) | |
942 | cp = ""; | |
943 | /* Store window size in the packet. */ | |
944 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) | |
945 | memset(&ws, 0, sizeof(ws)); | |
946 | ||
947 | channel_request_start(id, "pty-req", 0); | |
948 | packet_put_cstring(cp); | |
949 | packet_put_int(ws.ws_col); | |
950 | packet_put_int(ws.ws_row); | |
951 | packet_put_int(ws.ws_xpixel); | |
952 | packet_put_int(ws.ws_ypixel); | |
953 | packet_put_cstring(""); /* XXX: encode terminal modes */ | |
954 | packet_send(); | |
955 | /* XXX wait for reply */ | |
956 | } | |
0b242b12 | 957 | if (options.forward_x11 && |
958 | getenv("DISPLAY") != NULL) { | |
959 | char proto[512], data[512]; | |
960 | /* Get reasonable local authentication information. */ | |
961 | x11_get_proto(proto, sizeof proto, data, sizeof data); | |
962 | /* Request forwarding with authentication spoofing. */ | |
963 | debug("Requesting X11 forwarding with authentication spoofing."); | |
964 | x11_request_forwarding_with_spoofing(id, proto, data); | |
965 | /* XXX wait for reply */ | |
966 | } | |
967 | ||
fa08c86b | 968 | check_agent_present(); |
969 | if (options.forward_agent) { | |
970 | debug("Requesting authentication agent forwarding."); | |
971 | channel_request_start(id, "auth-agent-req@openssh.com", 0); | |
972 | packet_send(); | |
973 | } | |
974 | ||
8ce64345 | 975 | len = buffer_len(&command); |
976 | if (len > 0) { | |
977 | if (len > 900) | |
978 | len = 900; | |
979 | debug("Sending command: %.*s", len, buffer_ptr(&command)); | |
980 | channel_request_start(id, "exec", 0); | |
981 | packet_put_string(buffer_ptr(&command), len); | |
982 | packet_send(); | |
983 | } else { | |
984 | channel_request(id, "shell", 0); | |
985 | } | |
986 | /* channel_callback(id, SSH2_MSG_OPEN_CONFIGMATION, client_init, 0); */ | |
987 | done: | |
988 | /* register different callback, etc. XXX */ | |
989 | client_set_session_ident(id); | |
990 | } | |
991 | ||
992 | int | |
993 | ssh_session2(void) | |
994 | { | |
995 | int window, packetmax, id; | |
2e73a022 | 996 | int in, out, err; |
997 | ||
14a9a859 | 998 | if (stdin_null_flag) { |
999 | in = open("/dev/null", O_RDONLY); | |
1000 | } else { | |
1001 | in = dup(STDIN_FILENO); | |
1002 | } | |
2e73a022 | 1003 | out = dup(STDOUT_FILENO); |
1004 | err = dup(STDERR_FILENO); | |
8ce64345 | 1005 | |
1006 | if (in < 0 || out < 0 || err < 0) | |
14a9a859 | 1007 | fatal("dup() in/out/err failed"); |
8ce64345 | 1008 | |
a22aff1f | 1009 | /* enable nonblocking unless tty */ |
1010 | if (!isatty(in)) | |
1011 | set_nonblock(in); | |
1012 | if (!isatty(out)) | |
1013 | set_nonblock(out); | |
1014 | if (!isatty(err)) | |
1015 | set_nonblock(err); | |
1016 | ||
fa08c86b | 1017 | /* XXX should be pre-session */ |
1018 | ssh_init_forwarding(); | |
8ce64345 | 1019 | |
14a9a859 | 1020 | /* If requested, let ssh continue in the background. */ |
1021 | if (fork_after_authentication_flag) | |
1022 | if (daemon(1, 1) < 0) | |
1023 | fatal("daemon() failed: %.200s", strerror(errno)); | |
1024 | ||
bcbf86ec | 1025 | window = CHAN_SES_WINDOW_DEFAULT; |
1026 | packetmax = CHAN_SES_PACKET_DEFAULT; | |
1027 | if (!tty_flag) { | |
8ce64345 | 1028 | window *= 2; |
bcbf86ec | 1029 | packetmax *=2; |
8ce64345 | 1030 | } |
8ce64345 | 1031 | id = channel_new( |
1032 | "session", SSH_CHANNEL_OPENING, in, out, err, | |
bcbf86ec | 1033 | window, packetmax, CHAN_EXTENDED_WRITE, |
a22aff1f | 1034 | xstrdup("client-session"), /*nonblock*/0); |
8ce64345 | 1035 | |
8ce64345 | 1036 | channel_open(id); |
fa08c86b | 1037 | channel_register_callback(id, SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, |
1038 | ssh_session2_callback, (void *)0); | |
5260325f | 1039 | |
2e73a022 | 1040 | return client_loop(tty_flag, tty_flag ? options.escape_char : -1, id); |
8efc0c15 | 1041 | } |
fa08c86b | 1042 | |
1043 | int | |
1044 | guess_identity_file_type(const char *filename) | |
1045 | { | |
1046 | struct stat st; | |
1047 | Key *public; | |
1048 | int type = KEY_RSA1; /* default */ | |
1049 | ||
1050 | if (stat(filename, &st) < 0) { | |
1051 | perror(filename); | |
1052 | return KEY_UNSPEC; | |
1053 | } | |
1054 | public = key_new(type); | |
1055 | if (!load_public_key(filename, public, NULL)) { | |
1056 | /* ok, so we will assume this is 'some' key */ | |
1057 | type = KEY_UNSPEC; | |
1058 | } | |
1059 | key_free(public); | |
1060 | return type; | |
1061 | } |