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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" | |
bcbf86ec | 42 | RCSID("$OpenBSD: ssh.c,v 1.66 2000/09/12 20:53:10 markus Exp $"); |
8efc0c15 | 43 | |
a306f2dd | 44 | #include <openssl/evp.h> |
45 | #include <openssl/dsa.h> | |
46 | #include <openssl/rsa.h> | |
47 | ||
8efc0c15 | 48 | #include "xmalloc.h" |
49 | #include "ssh.h" | |
50 | #include "packet.h" | |
51 | #include "buffer.h" | |
8efc0c15 | 52 | #include "readconf.h" |
53 | #include "uidswap.h" | |
8ce64345 | 54 | |
55 | #include "ssh2.h" | |
56 | #include "compat.h" | |
7368a6c8 | 57 | #include "channels.h" |
a306f2dd | 58 | #include "key.h" |
4c8722d9 | 59 | #include "authfd.h" |
a306f2dd | 60 | #include "authfile.h" |
8efc0c15 | 61 | |
f601d847 | 62 | #ifdef HAVE___PROGNAME |
63 | extern char *__progname; | |
64 | #else /* HAVE___PROGNAME */ | |
3fd95d9a | 65 | static const char *__progname = "ssh"; |
f601d847 | 66 | #endif /* HAVE___PROGNAME */ |
67 | ||
48e671d5 | 68 | /* Flag indicating whether IPv4 or IPv6. This can be set on the command line. |
69 | Default value is AF_UNSPEC means both IPv4 and IPv6. */ | |
59e76f33 | 70 | #ifdef IPV4_DEFAULT |
71 | int IPv4or6 = AF_INET; | |
72 | #else | |
48e671d5 | 73 | int IPv4or6 = AF_UNSPEC; |
59e76f33 | 74 | #endif |
48e671d5 | 75 | |
5260325f | 76 | /* Flag indicating whether debug mode is on. This can be set on the command line. */ |
8efc0c15 | 77 | int debug_flag = 0; |
78 | ||
a8be9f80 | 79 | /* Flag indicating whether a tty should be allocated */ |
8efc0c15 | 80 | int tty_flag = 0; |
81 | ||
8ce64345 | 82 | /* don't exec a shell */ |
83 | int no_shell_flag = 0; | |
84 | int no_tty_flag = 0; | |
85 | ||
aa3378df | 86 | /* |
87 | * Flag indicating that nothing should be read from stdin. This can be set | |
88 | * on the command line. | |
89 | */ | |
8efc0c15 | 90 | int stdin_null_flag = 0; |
91 | ||
aa3378df | 92 | /* |
93 | * Flag indicating that ssh should fork after authentication. This is useful | |
94 | * so that the pasphrase can be entered manually, and then ssh goes to the | |
95 | * background. | |
96 | */ | |
8efc0c15 | 97 | int fork_after_authentication_flag = 0; |
98 | ||
aa3378df | 99 | /* |
100 | * General data structure for command line options and options configurable | |
101 | * in configuration files. See readconf.h. | |
102 | */ | |
8efc0c15 | 103 | Options options; |
104 | ||
aa3378df | 105 | /* |
106 | * Name of the host we are connecting to. This is the name given on the | |
107 | * command line, or the HostName specified for the user-supplied name in a | |
108 | * configuration file. | |
109 | */ | |
8efc0c15 | 110 | char *host; |
111 | ||
112 | /* socket address the host resolves to */ | |
48e671d5 | 113 | struct sockaddr_storage hostaddr; |
8efc0c15 | 114 | |
aa3378df | 115 | /* |
116 | * Flag to indicate that we have received a window change signal which has | |
117 | * not yet been processed. This will cause a message indicating the new | |
118 | * window size to be sent to the server a little later. This is volatile | |
119 | * because this is updated in a signal handler. | |
120 | */ | |
8efc0c15 | 121 | volatile int received_window_change_signal = 0; |
122 | ||
123 | /* Value of argv[0] (set in the main program). */ | |
124 | char *av0; | |
125 | ||
126 | /* Flag indicating whether we have a valid host private key loaded. */ | |
127 | int host_private_key_loaded = 0; | |
128 | ||
129 | /* Host private key. */ | |
130 | RSA *host_private_key = NULL; | |
131 | ||
132 | /* Original real UID. */ | |
133 | uid_t original_real_uid; | |
134 | ||
8ce64345 | 135 | /* command to be executed */ |
136 | Buffer command; | |
137 | ||
8efc0c15 | 138 | /* Prints a help message to the user. This function never returns. */ |
139 | ||
140 | void | |
141 | usage() | |
142 | { | |
5260325f | 143 | fprintf(stderr, "Usage: %s [options] host [command]\n", av0); |
144 | fprintf(stderr, "Options:\n"); | |
145 | fprintf(stderr, " -l user Log in using this user name.\n"); | |
146 | fprintf(stderr, " -n Redirect input from /dev/null.\n"); | |
71276795 | 147 | fprintf(stderr, " -A Enable authentication agent forwarding.\n"); |
5260325f | 148 | fprintf(stderr, " -a Disable authentication agent forwarding.\n"); |
8efc0c15 | 149 | #ifdef AFS |
5260325f | 150 | fprintf(stderr, " -k Disable Kerberos ticket and AFS token forwarding.\n"); |
151 | #endif /* AFS */ | |
0e73cc53 | 152 | fprintf(stderr, " -X Enable X11 connection forwarding.\n"); |
5260325f | 153 | fprintf(stderr, " -x Disable X11 connection forwarding.\n"); |
154 | fprintf(stderr, " -i file Identity for RSA authentication (default: ~/.ssh/identity).\n"); | |
155 | fprintf(stderr, " -t Tty; allocate a tty even if command is given.\n"); | |
8ce64345 | 156 | fprintf(stderr, " -T Do not allocate a tty.\n"); |
5260325f | 157 | fprintf(stderr, " -v Verbose; display verbose debugging messages.\n"); |
bcbf86ec | 158 | fprintf(stderr, " Multiple -v increases verbosity.\n"); |
5260325f | 159 | fprintf(stderr, " -V Display version number only.\n"); |
160 | fprintf(stderr, " -P Don't allocate a privileged port.\n"); | |
161 | fprintf(stderr, " -q Quiet; don't display any warning messages.\n"); | |
162 | fprintf(stderr, " -f Fork into background after authentication.\n"); | |
163 | fprintf(stderr, " -e char Set escape character; ``none'' = disable (default: ~).\n"); | |
164 | ||
165 | fprintf(stderr, " -c cipher Select encryption algorithm: " | |
166 | "``3des'', " | |
167 | "``blowfish''\n"); | |
168 | fprintf(stderr, " -p port Connect to this port. Server must be on the same port.\n"); | |
169 | fprintf(stderr, " -L listen-port:host:port Forward local port to remote address\n"); | |
170 | fprintf(stderr, " -R listen-port:host:port Forward remote port to local address\n"); | |
171 | fprintf(stderr, " These cause %s to listen for connections on a port, and\n", av0); | |
172 | fprintf(stderr, " forward them to the other side by connecting to host:port.\n"); | |
173 | fprintf(stderr, " -C Enable compression.\n"); | |
8ce64345 | 174 | fprintf(stderr, " -N Do not execute a shell or command.\n"); |
5260325f | 175 | fprintf(stderr, " -g Allow remote hosts to connect to forwarded ports.\n"); |
48e671d5 | 176 | fprintf(stderr, " -4 Use IPv4 only.\n"); |
177 | fprintf(stderr, " -6 Use IPv6 only.\n"); | |
6ae2364d | 178 | fprintf(stderr, " -2 Force protocol version 2.\n"); |
5260325f | 179 | fprintf(stderr, " -o 'option' Process the option as if it was read from a configuration file.\n"); |
180 | exit(1); | |
8efc0c15 | 181 | } |
182 | ||
5260325f | 183 | /* |
184 | * Connects to the given host using rsh (or prints an error message and exits | |
185 | * if rsh is not available). This function never returns. | |
186 | */ | |
8efc0c15 | 187 | void |
5260325f | 188 | rsh_connect(char *host, char *user, Buffer * command) |
8efc0c15 | 189 | { |
5260325f | 190 | char *args[10]; |
191 | int i; | |
192 | ||
193 | log("Using rsh. WARNING: Connection will not be encrypted."); | |
194 | /* Build argument list for rsh. */ | |
195 | i = 0; | |
196 | args[i++] = _PATH_RSH; | |
197 | /* host may have to come after user on some systems */ | |
198 | args[i++] = host; | |
199 | if (user) { | |
200 | args[i++] = "-l"; | |
201 | args[i++] = user; | |
202 | } | |
203 | if (buffer_len(command) > 0) { | |
204 | buffer_append(command, "\0", 1); | |
205 | args[i++] = buffer_ptr(command); | |
206 | } | |
207 | args[i++] = NULL; | |
208 | if (debug_flag) { | |
209 | for (i = 0; args[i]; i++) { | |
210 | if (i != 0) | |
211 | fprintf(stderr, " "); | |
212 | fprintf(stderr, "%s", args[i]); | |
213 | } | |
214 | fprintf(stderr, "\n"); | |
8efc0c15 | 215 | } |
5260325f | 216 | execv(_PATH_RSH, args); |
217 | perror(_PATH_RSH); | |
218 | exit(1); | |
8efc0c15 | 219 | } |
220 | ||
8ce64345 | 221 | int ssh_session(void); |
222 | int ssh_session2(void); | |
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 | |
264dce47 | 238 | init_rng(); |
239 | ||
aa3378df | 240 | /* |
241 | * Save the original real uid. It will be needed later (uid-swapping | |
242 | * may clobber the real uid). | |
243 | */ | |
5260325f | 244 | original_real_uid = getuid(); |
245 | original_effective_uid = geteuid(); | |
246 | ||
77bb0bca | 247 | #if !defined(HAVE_SETRLIMIT) || !defined(HAVE_CYGWIN) |
5260325f | 248 | /* If we are installed setuid root be careful to not drop core. */ |
249 | if (original_real_uid != original_effective_uid) { | |
250 | struct rlimit rlim; | |
251 | rlim.rlim_cur = rlim.rlim_max = 0; | |
252 | if (setrlimit(RLIMIT_CORE, &rlim) < 0) | |
253 | fatal("setrlimit failed: %.100s", strerror(errno)); | |
8efc0c15 | 254 | } |
3c62e7eb | 255 | #endif |
aa3378df | 256 | /* |
257 | * Use uid-swapping to give up root privileges for the duration of | |
258 | * option processing. We will re-instantiate the rights when we are | |
259 | * ready to create the privileged port, and will permanently drop | |
260 | * them when the port has been created (actually, when the connection | |
261 | * has been made, as we may need to create the port several times). | |
262 | */ | |
5260325f | 263 | temporarily_use_uid(original_real_uid); |
264 | ||
aa3378df | 265 | /* |
266 | * Set our umask to something reasonable, as some files are created | |
267 | * with the default umask. This will make them world-readable but | |
268 | * writable only by the owner, which is ok for all files for which we | |
269 | * don't set the modes explicitly. | |
270 | */ | |
5260325f | 271 | umask(022); |
272 | ||
273 | /* Save our own name. */ | |
274 | av0 = av[0]; | |
275 | ||
276 | /* Initialize option structure to indicate that no values have been set. */ | |
277 | initialize_options(&options); | |
278 | ||
279 | /* Parse command-line arguments. */ | |
280 | host = NULL; | |
281 | ||
282 | /* If program name is not one of the standard names, use it as host name. */ | |
283 | if (strchr(av0, '/')) | |
284 | cp = strrchr(av0, '/') + 1; | |
285 | else | |
286 | cp = av0; | |
3c62e7eb | 287 | #ifdef HAVE_CYGWIN |
288 | if (strcasecmp(cp, "rsh") && strcasecmp(cp, "ssh") && | |
289 | strcasecmp(cp, "rlogin") && strcasecmp(cp, "slogin") && | |
290 | strcasecmp(cp, "remsh") && | |
291 | strcasecmp(cp, "rsh.exe") && strcasecmp(cp, "ssh.exe") && | |
292 | strcasecmp(cp, "rlogin.exe") && strcasecmp(cp, "slogin.exe") && | |
293 | strcasecmp(cp, "remsh.exe")) | |
294 | #else | |
2e73a022 | 295 | if (strcmp(cp, "rsh") && strcmp(cp, "ssh") && strcmp(cp, "rlogin") && |
296 | strcmp(cp, "slogin") && strcmp(cp, "remsh")) | |
3c62e7eb | 297 | #endif |
5260325f | 298 | host = cp; |
299 | ||
300 | for (optind = 1; optind < ac; optind++) { | |
301 | if (av[optind][0] != '-') { | |
302 | if (host) | |
303 | break; | |
304 | if ((cp = strchr(av[optind], '@'))) { | |
6ae2364d | 305 | if(cp == av[optind]) |
306 | usage(); | |
5260325f | 307 | options.user = av[optind]; |
308 | *cp = '\0'; | |
309 | host = ++cp; | |
310 | } else | |
311 | host = av[optind]; | |
312 | continue; | |
313 | } | |
314 | opt = av[optind][1]; | |
315 | if (!opt) | |
316 | usage(); | |
317 | if (strchr("eilcpLRo", opt)) { /* options with arguments */ | |
318 | optarg = av[optind] + 2; | |
319 | if (strcmp(optarg, "") == 0) { | |
320 | if (optind >= ac - 1) | |
321 | usage(); | |
322 | optarg = av[++optind]; | |
323 | } | |
324 | } else { | |
325 | if (av[optind][2]) | |
326 | usage(); | |
327 | optarg = NULL; | |
328 | } | |
329 | switch (opt) { | |
6ae2364d | 330 | case '2': |
331 | options.protocol = SSH_PROTO_2; | |
332 | break; | |
48e671d5 | 333 | case '4': |
334 | IPv4or6 = AF_INET; | |
335 | break; | |
48e671d5 | 336 | case '6': |
337 | IPv4or6 = AF_INET6; | |
338 | break; | |
5260325f | 339 | case 'n': |
340 | stdin_null_flag = 1; | |
341 | break; | |
5260325f | 342 | case 'f': |
343 | fork_after_authentication_flag = 1; | |
344 | stdin_null_flag = 1; | |
345 | break; | |
5260325f | 346 | case 'x': |
347 | options.forward_x11 = 0; | |
348 | break; | |
5260325f | 349 | case 'X': |
350 | options.forward_x11 = 1; | |
351 | break; | |
5260325f | 352 | case 'g': |
353 | options.gateway_ports = 1; | |
354 | break; | |
5260325f | 355 | case 'P': |
356 | options.use_privileged_port = 0; | |
357 | break; | |
5260325f | 358 | case 'a': |
359 | options.forward_agent = 0; | |
360 | break; | |
71276795 | 361 | case 'A': |
362 | options.forward_agent = 1; | |
363 | break; | |
5260325f | 364 | #ifdef AFS |
365 | case 'k': | |
366 | options.kerberos_tgt_passing = 0; | |
367 | options.afs_token_passing = 0; | |
368 | break; | |
369 | #endif | |
370 | case 'i': | |
371 | if (stat(optarg, &st) < 0) { | |
372 | fprintf(stderr, "Warning: Identity file %s does not exist.\n", | |
373 | optarg); | |
374 | break; | |
375 | } | |
376 | if (options.num_identity_files >= SSH_MAX_IDENTITY_FILES) | |
377 | fatal("Too many identity files specified (max %d)", | |
378 | SSH_MAX_IDENTITY_FILES); | |
379 | options.identity_files[options.num_identity_files++] = | |
380 | xstrdup(optarg); | |
381 | break; | |
5260325f | 382 | case 't': |
383 | tty_flag = 1; | |
384 | break; | |
5260325f | 385 | case 'v': |
bcbf86ec | 386 | if (0 == debug_flag) { |
387 | debug_flag = 1; | |
388 | options.log_level = SYSLOG_LEVEL_DEBUG1; | |
389 | } else if (options.log_level < SYSLOG_LEVEL_DEBUG3) { | |
390 | options.log_level++; | |
391 | break; | |
392 | } else { | |
393 | fatal("Too high debugging level.\n"); | |
394 | } | |
395 | /* fallthrough */ | |
5260325f | 396 | case 'V': |
a8be9f80 | 397 | fprintf(stderr, "SSH Version %s, protocol versions %d.%d/%d.%d.\n", |
398 | SSH_VERSION, | |
399 | PROTOCOL_MAJOR_1, PROTOCOL_MINOR_1, | |
400 | PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2); | |
8ce64345 | 401 | fprintf(stderr, "Compiled with SSL (0x%8.8lx).\n", SSLeay()); |
5260325f | 402 | if (opt == 'V') |
403 | exit(0); | |
5260325f | 404 | break; |
5260325f | 405 | case 'q': |
406 | options.log_level = SYSLOG_LEVEL_QUIET; | |
407 | break; | |
5260325f | 408 | case 'e': |
409 | if (optarg[0] == '^' && optarg[2] == 0 && | |
410 | (unsigned char) optarg[1] >= 64 && (unsigned char) optarg[1] < 128) | |
411 | options.escape_char = (unsigned char) optarg[1] & 31; | |
412 | else if (strlen(optarg) == 1) | |
413 | options.escape_char = (unsigned char) optarg[0]; | |
414 | else if (strcmp(optarg, "none") == 0) | |
415 | options.escape_char = -2; | |
416 | else { | |
417 | fprintf(stderr, "Bad escape character '%s'.\n", optarg); | |
418 | exit(1); | |
419 | } | |
420 | break; | |
5260325f | 421 | case 'c': |
a306f2dd | 422 | if (ciphers_valid(optarg)) { |
423 | /* SSH2 only */ | |
424 | options.ciphers = xstrdup(optarg); | |
d0c832f3 | 425 | options.cipher = SSH_CIPHER_ILLEGAL; |
a306f2dd | 426 | } else { |
427 | /* SSH1 only */ | |
428 | options.cipher = cipher_number(optarg); | |
429 | if (options.cipher == -1) { | |
430 | fprintf(stderr, "Unknown cipher type '%s'\n", optarg); | |
431 | exit(1); | |
432 | } | |
5260325f | 433 | } |
434 | break; | |
5260325f | 435 | case 'p': |
436 | options.port = atoi(optarg); | |
5260325f | 437 | break; |
5260325f | 438 | case 'l': |
439 | options.user = optarg; | |
440 | break; | |
5260325f | 441 | case 'R': |
48e671d5 | 442 | if (sscanf(optarg, "%hu/%255[^/]/%hu", &fwd_port, buf, |
443 | &fwd_host_port) != 3 && | |
444 | sscanf(optarg, "%hu:%255[^:]:%hu", &fwd_port, buf, | |
445 | &fwd_host_port) != 3) { | |
5260325f | 446 | fprintf(stderr, "Bad forwarding specification '%s'.\n", optarg); |
447 | usage(); | |
448 | /* NOTREACHED */ | |
449 | } | |
450 | add_remote_forward(&options, fwd_port, buf, fwd_host_port); | |
451 | break; | |
5260325f | 452 | case 'L': |
48e671d5 | 453 | if (sscanf(optarg, "%hu/%255[^/]/%hu", &fwd_port, buf, |
454 | &fwd_host_port) != 3 && | |
455 | sscanf(optarg, "%hu:%255[^:]:%hu", &fwd_port, buf, | |
456 | &fwd_host_port) != 3) { | |
5260325f | 457 | fprintf(stderr, "Bad forwarding specification '%s'.\n", optarg); |
458 | usage(); | |
459 | /* NOTREACHED */ | |
460 | } | |
461 | add_local_forward(&options, fwd_port, buf, fwd_host_port); | |
462 | break; | |
5260325f | 463 | case 'C': |
464 | options.compression = 1; | |
465 | break; | |
8ce64345 | 466 | case 'N': |
467 | no_shell_flag = 1; | |
468 | no_tty_flag = 1; | |
469 | break; | |
8ce64345 | 470 | case 'T': |
471 | no_tty_flag = 1; | |
472 | break; | |
5260325f | 473 | case 'o': |
474 | dummy = 1; | |
475 | if (process_config_line(&options, host ? host : "", optarg, | |
476 | "command-line", 0, &dummy) != 0) | |
477 | exit(1); | |
478 | break; | |
5260325f | 479 | default: |
480 | usage(); | |
481 | } | |
482 | } | |
483 | ||
484 | /* Check that we got a host name. */ | |
485 | if (!host) | |
8efc0c15 | 486 | usage(); |
5260325f | 487 | |
22d89d24 | 488 | SSLeay_add_all_algorithms(); |
489 | ||
5260325f | 490 | /* Initialize the command to execute on remote host. */ |
491 | buffer_init(&command); | |
492 | ||
aa3378df | 493 | /* |
494 | * Save the command to execute on the remote host in a buffer. There | |
495 | * is no limit on the length of the command, except by the maximum | |
496 | * packet size. Also sets the tty flag if there is no command. | |
497 | */ | |
5260325f | 498 | if (optind == ac) { |
499 | /* No command specified - execute shell on a tty. */ | |
500 | tty_flag = 1; | |
501 | } else { | |
502 | /* A command has been specified. Store it into the | |
503 | buffer. */ | |
504 | for (i = optind; i < ac; i++) { | |
505 | if (i > optind) | |
506 | buffer_append(&command, " ", 1); | |
507 | buffer_append(&command, av[i], strlen(av[i])); | |
508 | } | |
8efc0c15 | 509 | } |
5260325f | 510 | |
511 | /* Cannot fork to background if no command. */ | |
14a9a859 | 512 | if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag) |
5260325f | 513 | fatal("Cannot fork into background without a command to execute."); |
514 | ||
515 | /* Allocate a tty by default if no command specified. */ | |
516 | if (buffer_len(&command) == 0) | |
517 | tty_flag = 1; | |
518 | ||
519 | /* Do not allocate a tty if stdin is not a tty. */ | |
520 | if (!isatty(fileno(stdin))) { | |
521 | if (tty_flag) | |
522 | fprintf(stderr, "Pseudo-terminal will not be allocated because stdin is not a terminal.\n"); | |
523 | tty_flag = 0; | |
524 | } | |
8ce64345 | 525 | /* force */ |
526 | if (no_tty_flag) | |
527 | tty_flag = 0; | |
528 | ||
5260325f | 529 | /* Get user data. */ |
530 | pw = getpwuid(original_real_uid); | |
531 | if (!pw) { | |
532 | fprintf(stderr, "You don't exist, go away!\n"); | |
533 | exit(1); | |
534 | } | |
535 | /* Take a copy of the returned structure. */ | |
536 | memset(&pwcopy, 0, sizeof(pwcopy)); | |
537 | pwcopy.pw_name = xstrdup(pw->pw_name); | |
538 | pwcopy.pw_passwd = xstrdup(pw->pw_passwd); | |
539 | pwcopy.pw_uid = pw->pw_uid; | |
540 | pwcopy.pw_gid = pw->pw_gid; | |
2e73a022 | 541 | #ifdef HAVE_PW_CLASS_IN_PASSWD |
542 | pwcopy.pw_class = xstrdup(pw->pw_class); | |
543 | #endif | |
5260325f | 544 | pwcopy.pw_dir = xstrdup(pw->pw_dir); |
545 | pwcopy.pw_shell = xstrdup(pw->pw_shell); | |
546 | pw = &pwcopy; | |
547 | ||
548 | /* Initialize "log" output. Since we are the client all output | |
549 | actually goes to the terminal. */ | |
550 | log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 0); | |
551 | ||
552 | /* Read per-user configuration file. */ | |
553 | snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, SSH_USER_CONFFILE); | |
554 | read_config_file(buf, host, &options); | |
555 | ||
556 | /* Read systemwide configuration file. */ | |
557 | read_config_file(HOST_CONFIG_FILE, host, &options); | |
558 | ||
559 | /* Fill configuration defaults. */ | |
560 | fill_default_options(&options); | |
561 | ||
562 | /* reinit */ | |
563 | log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 0); | |
564 | ||
a306f2dd | 565 | /* check if RSA support exists */ |
566 | if ((options.protocol & SSH_PROTO_1) && | |
567 | rsa_alive() == 0) { | |
568 | log("%s: no RSA support in libssl and libcrypto. See ssl(8).", | |
569 | __progname); | |
570 | log("Disabling protocol version 1"); | |
571 | options.protocol &= ~ (SSH_PROTO_1|SSH_PROTO_1_PREFERRED); | |
572 | } | |
573 | if (! options.protocol & (SSH_PROTO_1|SSH_PROTO_2)) { | |
574 | fprintf(stderr, "%s: No protocol version available.\n", | |
575 | __progname); | |
576 | exit(1); | |
577 | } | |
578 | ||
5260325f | 579 | if (options.user == NULL) |
580 | options.user = xstrdup(pw->pw_name); | |
581 | ||
582 | if (options.hostname != NULL) | |
583 | host = options.hostname; | |
584 | ||
585 | /* Find canonic host name. */ | |
586 | if (strchr(host, '.') == 0) { | |
48e671d5 | 587 | struct addrinfo hints; |
588 | struct addrinfo *ai = NULL; | |
589 | int errgai; | |
590 | memset(&hints, 0, sizeof(hints)); | |
c8d54615 | 591 | hints.ai_family = IPv4or6; |
48e671d5 | 592 | hints.ai_flags = AI_CANONNAME; |
593 | hints.ai_socktype = SOCK_STREAM; | |
594 | errgai = getaddrinfo(host, NULL, &hints, &ai); | |
595 | if (errgai == 0) { | |
596 | if (ai->ai_canonname != NULL) | |
597 | host = xstrdup(ai->ai_canonname); | |
598 | freeaddrinfo(ai); | |
8efc0c15 | 599 | } |
8efc0c15 | 600 | } |
5260325f | 601 | /* Disable rhosts authentication if not running as root. */ |
3c62e7eb | 602 | #ifdef HAVE_CYGWIN |
603 | /* Ignore uid if running under Windows */ | |
604 | if (!options.use_privileged_port) { | |
605 | #else | |
5260325f | 606 | if (original_effective_uid != 0 || !options.use_privileged_port) { |
3c62e7eb | 607 | #endif |
5260325f | 608 | options.rhosts_authentication = 0; |
609 | options.rhosts_rsa_authentication = 0; | |
610 | } | |
aa3378df | 611 | /* |
612 | * If using rsh has been selected, exec it now (without trying | |
613 | * anything else). Note that we must release privileges first. | |
614 | */ | |
5260325f | 615 | if (options.use_rsh) { |
aa3378df | 616 | /* |
617 | * Restore our superuser privileges. This must be done | |
618 | * before permanently setting the uid. | |
619 | */ | |
5260325f | 620 | restore_uid(); |
621 | ||
622 | /* Switch to the original uid permanently. */ | |
623 | permanently_set_uid(original_real_uid); | |
624 | ||
625 | /* Execute rsh. */ | |
626 | rsh_connect(host, options.user, &command); | |
627 | fatal("rsh_connect returned"); | |
8efc0c15 | 628 | } |
5260325f | 629 | /* Restore our superuser privileges. */ |
630 | restore_uid(); | |
631 | ||
aa3378df | 632 | /* |
633 | * Open a connection to the remote host. This needs root privileges | |
634 | * if rhosts_{rsa_}authentication is enabled. | |
635 | */ | |
5260325f | 636 | |
637 | ok = ssh_connect(host, &hostaddr, options.port, | |
638 | options.connection_attempts, | |
639 | !options.rhosts_authentication && | |
640 | !options.rhosts_rsa_authentication, | |
641 | original_real_uid, | |
642 | options.proxy_command); | |
643 | ||
aa3378df | 644 | /* |
645 | * If we successfully made the connection, load the host private key | |
646 | * in case we will need it later for combined rsa-rhosts | |
647 | * authentication. This must be done before releasing extra | |
648 | * privileges, because the file is only readable by root. | |
649 | */ | |
a306f2dd | 650 | if (ok && (options.protocol & SSH_PROTO_1)) { |
651 | Key k; | |
5260325f | 652 | host_private_key = RSA_new(); |
a306f2dd | 653 | k.type = KEY_RSA; |
654 | k.rsa = host_private_key; | |
655 | if (load_private_key(HOST_KEY_FILE, "", &k, NULL)) | |
5260325f | 656 | host_private_key_loaded = 1; |
657 | } | |
aa3378df | 658 | /* |
659 | * Get rid of any extra privileges that we may have. We will no | |
660 | * longer need them. Also, extra privileges could make it very hard | |
661 | * to read identity files and other non-world-readable files from the | |
662 | * user's home directory if it happens to be on a NFS volume where | |
663 | * root is mapped to nobody. | |
664 | */ | |
665 | ||
666 | /* | |
667 | * Note that some legacy systems need to postpone the following call | |
668 | * to permanently_set_uid() until the private hostkey is destroyed | |
669 | * with RSA_free(). Otherwise the calling user could ptrace() the | |
670 | * process, read the private hostkey and impersonate the host. | |
671 | * OpenBSD does not allow ptracing of setuid processes. | |
672 | */ | |
5260325f | 673 | permanently_set_uid(original_real_uid); |
674 | ||
aa3378df | 675 | /* |
676 | * Now that we are back to our own permissions, create ~/.ssh | |
677 | * directory if it doesn\'t already exist. | |
678 | */ | |
5260325f | 679 | snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, SSH_USER_DIR); |
680 | if (stat(buf, &st) < 0) | |
704b1659 | 681 | if (mkdir(buf, 0700) < 0) |
5260325f | 682 | error("Could not create directory '%.200s'.", buf); |
683 | ||
684 | /* Check if the connection failed, and try "rsh" if appropriate. */ | |
685 | if (!ok) { | |
686 | if (options.port != 0) | |
57112b5a | 687 | log("Secure connection to %.100s on port %hu refused%.100s.", |
5260325f | 688 | host, options.port, |
689 | options.fallback_to_rsh ? "; reverting to insecure method" : ""); | |
690 | else | |
691 | log("Secure connection to %.100s refused%.100s.", host, | |
692 | options.fallback_to_rsh ? "; reverting to insecure method" : ""); | |
693 | ||
694 | if (options.fallback_to_rsh) { | |
695 | rsh_connect(host, options.user, &command); | |
696 | fatal("rsh_connect returned"); | |
697 | } | |
698 | exit(1); | |
8efc0c15 | 699 | } |
5260325f | 700 | /* Expand ~ in options.identity_files. */ |
a306f2dd | 701 | /* XXX mem-leaks */ |
5260325f | 702 | for (i = 0; i < options.num_identity_files; i++) |
703 | options.identity_files[i] = | |
704 | tilde_expand_filename(options.identity_files[i], original_real_uid); | |
a306f2dd | 705 | for (i = 0; i < options.num_identity_files2; i++) |
706 | options.identity_files2[i] = | |
707 | tilde_expand_filename(options.identity_files2[i], original_real_uid); | |
5260325f | 708 | /* Expand ~ in known host file names. */ |
709 | options.system_hostfile = tilde_expand_filename(options.system_hostfile, | |
a306f2dd | 710 | original_real_uid); |
5260325f | 711 | options.user_hostfile = tilde_expand_filename(options.user_hostfile, |
a306f2dd | 712 | original_real_uid); |
713 | options.system_hostfile2 = tilde_expand_filename(options.system_hostfile2, | |
714 | original_real_uid); | |
715 | options.user_hostfile2 = tilde_expand_filename(options.user_hostfile2, | |
716 | original_real_uid); | |
5260325f | 717 | |
718 | /* Log into the remote system. This never returns if the login fails. */ | |
719 | ssh_login(host_private_key_loaded, host_private_key, | |
48e671d5 | 720 | host, (struct sockaddr *)&hostaddr, original_real_uid); |
5260325f | 721 | |
722 | /* We no longer need the host private key. Clear it now. */ | |
723 | if (host_private_key_loaded) | |
724 | RSA_free(host_private_key); /* Destroys contents safely */ | |
725 | ||
8ce64345 | 726 | exit_status = compat20 ? ssh_session2() : ssh_session(); |
727 | packet_close(); | |
728 | return exit_status; | |
729 | } | |
730 | ||
0b242b12 | 731 | void |
732 | x11_get_proto(char *proto, int proto_len, char *data, int data_len) | |
733 | { | |
734 | char line[512]; | |
735 | FILE *f; | |
736 | int got_data = 0, i; | |
737 | ||
fa649821 | 738 | if (options.xauth_location) { |
739 | /* Try to get Xauthority information for the display. */ | |
740 | snprintf(line, sizeof line, "%.100s list %.200s 2>/dev/null", | |
741 | options.xauth_location, getenv("DISPLAY")); | |
742 | f = popen(line, "r"); | |
743 | if (f && fgets(line, sizeof(line), f) && | |
744 | sscanf(line, "%*s %s %s", proto, data) == 2) | |
745 | got_data = 1; | |
746 | if (f) | |
747 | pclose(f); | |
748 | } | |
0b242b12 | 749 | /* |
750 | * If we didn't get authentication data, just make up some | |
751 | * data. The forwarding code will check the validity of the | |
752 | * response anyway, and substitute this data. The X11 | |
753 | * server, however, will ignore this fake data and use | |
754 | * whatever authentication mechanisms it was using otherwise | |
755 | * for the local connection. | |
756 | */ | |
757 | if (!got_data) { | |
758 | u_int32_t rand = 0; | |
759 | ||
760 | strlcpy(proto, "MIT-MAGIC-COOKIE-1", proto_len); | |
761 | for (i = 0; i < 16; i++) { | |
762 | if (i % 4 == 0) | |
763 | rand = arc4random(); | |
764 | snprintf(data + 2 * i, data_len - 2 * i, "%02x", rand & 0xff); | |
765 | rand >>= 8; | |
766 | } | |
767 | } | |
768 | } | |
769 | ||
8ce64345 | 770 | int |
771 | ssh_session(void) | |
772 | { | |
773 | int type; | |
774 | int i; | |
775 | int plen; | |
776 | int interactive = 0; | |
777 | int have_tty = 0; | |
778 | struct winsize ws; | |
779 | int authfd; | |
780 | char *cp; | |
781 | ||
5260325f | 782 | /* Enable compression if requested. */ |
783 | if (options.compression) { | |
784 | debug("Requesting compression at level %d.", options.compression_level); | |
785 | ||
786 | if (options.compression_level < 1 || options.compression_level > 9) | |
787 | fatal("Compression level must be from 1 (fast) to 9 (slow, best)."); | |
788 | ||
789 | /* Send the request. */ | |
790 | packet_start(SSH_CMSG_REQUEST_COMPRESSION); | |
791 | packet_put_int(options.compression_level); | |
792 | packet_send(); | |
793 | packet_write_wait(); | |
794 | type = packet_read(&plen); | |
795 | if (type == SSH_SMSG_SUCCESS) | |
796 | packet_start_compression(options.compression_level); | |
797 | else if (type == SSH_SMSG_FAILURE) | |
798 | log("Warning: Remote host refused compression."); | |
799 | else | |
800 | packet_disconnect("Protocol error waiting for compression response."); | |
801 | } | |
802 | /* Allocate a pseudo tty if appropriate. */ | |
803 | if (tty_flag) { | |
804 | debug("Requesting pty."); | |
805 | ||
806 | /* Start the packet. */ | |
807 | packet_start(SSH_CMSG_REQUEST_PTY); | |
808 | ||
809 | /* Store TERM in the packet. There is no limit on the | |
810 | length of the string. */ | |
811 | cp = getenv("TERM"); | |
812 | if (!cp) | |
813 | cp = ""; | |
814 | packet_put_string(cp, strlen(cp)); | |
815 | ||
816 | /* Store window size in the packet. */ | |
817 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) | |
818 | memset(&ws, 0, sizeof(ws)); | |
819 | packet_put_int(ws.ws_row); | |
820 | packet_put_int(ws.ws_col); | |
821 | packet_put_int(ws.ws_xpixel); | |
822 | packet_put_int(ws.ws_ypixel); | |
823 | ||
824 | /* Store tty modes in the packet. */ | |
825 | tty_make_modes(fileno(stdin)); | |
826 | ||
827 | /* Send the packet, and wait for it to leave. */ | |
828 | packet_send(); | |
829 | packet_write_wait(); | |
830 | ||
831 | /* Read response from the server. */ | |
832 | type = packet_read(&plen); | |
4fe2af09 | 833 | if (type == SSH_SMSG_SUCCESS) { |
5260325f | 834 | interactive = 1; |
8ce64345 | 835 | have_tty = 1; |
4fe2af09 | 836 | } else if (type == SSH_SMSG_FAILURE) |
5260325f | 837 | log("Warning: Remote host failed or refused to allocate a pseudo tty."); |
838 | else | |
839 | packet_disconnect("Protocol error waiting for pty request response."); | |
840 | } | |
841 | /* Request X11 forwarding if enabled and DISPLAY is set. */ | |
842 | if (options.forward_x11 && getenv("DISPLAY") != NULL) { | |
0b242b12 | 843 | char proto[512], data[512]; |
844 | /* Get reasonable local authentication information. */ | |
845 | x11_get_proto(proto, sizeof proto, data, sizeof data); | |
846 | /* Request forwarding with authentication spoofing. */ | |
5260325f | 847 | debug("Requesting X11 forwarding with authentication spoofing."); |
0b242b12 | 848 | x11_request_forwarding_with_spoofing(0, proto, data); |
5260325f | 849 | |
850 | /* Read response from the server. */ | |
851 | type = packet_read(&plen); | |
852 | if (type == SSH_SMSG_SUCCESS) { | |
5260325f | 853 | interactive = 1; |
0b242b12 | 854 | } else if (type == SSH_SMSG_FAILURE) { |
5260325f | 855 | log("Warning: Remote host denied X11 forwarding."); |
0b242b12 | 856 | } else { |
5260325f | 857 | packet_disconnect("Protocol error waiting for X11 forwarding"); |
0b242b12 | 858 | } |
5260325f | 859 | } |
860 | /* Tell the packet module whether this is an interactive session. */ | |
861 | packet_set_interactive(interactive, options.keepalives); | |
862 | ||
863 | /* Clear agent forwarding if we don\'t have an agent. */ | |
864 | authfd = ssh_get_authentication_socket(); | |
865 | if (authfd < 0) | |
866 | options.forward_agent = 0; | |
867 | else | |
868 | ssh_close_authentication_socket(authfd); | |
869 | ||
870 | /* Request authentication agent forwarding if appropriate. */ | |
871 | if (options.forward_agent) { | |
872 | debug("Requesting authentication agent forwarding."); | |
873 | auth_request_forwarding(); | |
874 | ||
875 | /* Read response from the server. */ | |
876 | type = packet_read(&plen); | |
877 | packet_integrity_check(plen, 0, type); | |
878 | if (type != SSH_SMSG_SUCCESS) | |
879 | log("Warning: Remote host denied authentication agent forwarding."); | |
880 | } | |
881 | /* Initiate local TCP/IP port forwardings. */ | |
882 | for (i = 0; i < options.num_local_forwards; i++) { | |
883 | debug("Connections to local port %d forwarded to remote address %.200s:%d", | |
884 | options.local_forwards[i].port, | |
885 | options.local_forwards[i].host, | |
886 | options.local_forwards[i].host_port); | |
887 | channel_request_local_forwarding(options.local_forwards[i].port, | |
6ae2364d | 888 | options.local_forwards[i].host, |
95f1eccc | 889 | options.local_forwards[i].host_port, |
890 | options.gateway_ports); | |
8efc0c15 | 891 | } |
892 | ||
5260325f | 893 | /* Initiate remote TCP/IP port forwardings. */ |
894 | for (i = 0; i < options.num_remote_forwards; i++) { | |
895 | debug("Connections to remote port %d forwarded to local address %.200s:%d", | |
896 | options.remote_forwards[i].port, | |
897 | options.remote_forwards[i].host, | |
898 | options.remote_forwards[i].host_port); | |
899 | channel_request_remote_forwarding(options.remote_forwards[i].port, | |
900 | options.remote_forwards[i].host, | |
6ae2364d | 901 | options.remote_forwards[i].host_port); |
8efc0c15 | 902 | } |
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 | void |
934 | init_local_fwd(void) | |
935 | { | |
936 | int i; | |
937 | /* Initiate local TCP/IP port forwardings. */ | |
938 | for (i = 0; i < options.num_local_forwards; i++) { | |
939 | debug("Connections to local port %d forwarded to remote address %.200s:%d", | |
940 | options.local_forwards[i].port, | |
941 | options.local_forwards[i].host, | |
942 | options.local_forwards[i].host_port); | |
943 | channel_request_local_forwarding(options.local_forwards[i].port, | |
6ae2364d | 944 | options.local_forwards[i].host, |
8ce64345 | 945 | options.local_forwards[i].host_port, |
946 | options.gateway_ports); | |
947 | } | |
948 | } | |
949 | ||
950 | extern void client_set_session_ident(int id); | |
951 | ||
952 | void | |
953 | client_init(int id, void *arg) | |
954 | { | |
955 | int len; | |
956 | debug("client_init id %d arg %d", id, (int)arg); | |
957 | ||
958 | if (no_shell_flag) | |
959 | goto done; | |
960 | ||
961 | if (tty_flag) { | |
962 | struct winsize ws; | |
963 | char *cp; | |
964 | cp = getenv("TERM"); | |
965 | if (!cp) | |
966 | cp = ""; | |
967 | /* Store window size in the packet. */ | |
968 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) | |
969 | memset(&ws, 0, sizeof(ws)); | |
970 | ||
971 | channel_request_start(id, "pty-req", 0); | |
972 | packet_put_cstring(cp); | |
973 | packet_put_int(ws.ws_col); | |
974 | packet_put_int(ws.ws_row); | |
975 | packet_put_int(ws.ws_xpixel); | |
976 | packet_put_int(ws.ws_ypixel); | |
977 | packet_put_cstring(""); /* XXX: encode terminal modes */ | |
978 | packet_send(); | |
979 | /* XXX wait for reply */ | |
980 | } | |
0b242b12 | 981 | if (options.forward_x11 && |
982 | getenv("DISPLAY") != NULL) { | |
983 | char proto[512], data[512]; | |
984 | /* Get reasonable local authentication information. */ | |
985 | x11_get_proto(proto, sizeof proto, data, sizeof data); | |
986 | /* Request forwarding with authentication spoofing. */ | |
987 | debug("Requesting X11 forwarding with authentication spoofing."); | |
988 | x11_request_forwarding_with_spoofing(id, proto, data); | |
989 | /* XXX wait for reply */ | |
990 | } | |
991 | ||
8ce64345 | 992 | len = buffer_len(&command); |
993 | if (len > 0) { | |
994 | if (len > 900) | |
995 | len = 900; | |
996 | debug("Sending command: %.*s", len, buffer_ptr(&command)); | |
997 | channel_request_start(id, "exec", 0); | |
998 | packet_put_string(buffer_ptr(&command), len); | |
999 | packet_send(); | |
1000 | } else { | |
1001 | channel_request(id, "shell", 0); | |
1002 | } | |
1003 | /* channel_callback(id, SSH2_MSG_OPEN_CONFIGMATION, client_init, 0); */ | |
1004 | done: | |
1005 | /* register different callback, etc. XXX */ | |
1006 | client_set_session_ident(id); | |
1007 | } | |
1008 | ||
1009 | int | |
1010 | ssh_session2(void) | |
1011 | { | |
1012 | int window, packetmax, id; | |
2e73a022 | 1013 | int in, out, err; |
1014 | ||
14a9a859 | 1015 | if (stdin_null_flag) { |
1016 | in = open("/dev/null", O_RDONLY); | |
1017 | } else { | |
1018 | in = dup(STDIN_FILENO); | |
1019 | } | |
2e73a022 | 1020 | out = dup(STDOUT_FILENO); |
1021 | err = dup(STDERR_FILENO); | |
8ce64345 | 1022 | |
1023 | if (in < 0 || out < 0 || err < 0) | |
14a9a859 | 1024 | fatal("dup() in/out/err failed"); |
8ce64345 | 1025 | |
1026 | /* should be pre-session */ | |
1027 | init_local_fwd(); | |
1028 | ||
14a9a859 | 1029 | /* If requested, let ssh continue in the background. */ |
1030 | if (fork_after_authentication_flag) | |
1031 | if (daemon(1, 1) < 0) | |
1032 | fatal("daemon() failed: %.200s", strerror(errno)); | |
1033 | ||
bcbf86ec | 1034 | window = CHAN_SES_WINDOW_DEFAULT; |
1035 | packetmax = CHAN_SES_PACKET_DEFAULT; | |
1036 | if (!tty_flag) { | |
8ce64345 | 1037 | window *= 2; |
bcbf86ec | 1038 | packetmax *=2; |
8ce64345 | 1039 | } |
8ce64345 | 1040 | id = channel_new( |
1041 | "session", SSH_CHANNEL_OPENING, in, out, err, | |
bcbf86ec | 1042 | window, packetmax, CHAN_EXTENDED_WRITE, |
1043 | xstrdup("client-session")); | |
8ce64345 | 1044 | |
8ce64345 | 1045 | channel_open(id); |
1046 | channel_register_callback(id, SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, client_init, (void *)0); | |
5260325f | 1047 | |
2e73a022 | 1048 | return client_loop(tty_flag, tty_flag ? options.escape_char : -1, id); |
8efc0c15 | 1049 | } |