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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" | |
63bd8c36 | 42 | RCSID("$OpenBSD: ssh.c,v 1.107 2001/04/06 21:00:13 markus Exp $"); |
8efc0c15 | 43 | |
a306f2dd | 44 | #include <openssl/evp.h> |
fa08c86b | 45 | #include <openssl/err.h> |
a306f2dd | 46 | |
8efc0c15 | 47 | #include "ssh.h" |
42f11eb2 | 48 | #include "ssh1.h" |
49 | #include "ssh2.h" | |
50 | #include "compat.h" | |
51 | #include "cipher.h" | |
52 | #include "xmalloc.h" | |
8efc0c15 | 53 | #include "packet.h" |
54 | #include "buffer.h" | |
8efc0c15 | 55 | #include "uidswap.h" |
7368a6c8 | 56 | #include "channels.h" |
a306f2dd | 57 | #include "key.h" |
4c8722d9 | 58 | #include "authfd.h" |
a306f2dd | 59 | #include "authfile.h" |
42f11eb2 | 60 | #include "pathnames.h" |
b5c334cc | 61 | #include "clientloop.h" |
42f11eb2 | 62 | #include "log.h" |
63 | #include "readconf.h" | |
64 | #include "sshconnect.h" | |
65 | #include "tildexpand.h" | |
1f3bf5aa | 66 | #include "dispatch.h" |
42f11eb2 | 67 | #include "misc.h" |
b2552997 | 68 | #include "kex.h" |
69 | #include "mac.h" | |
8efc0c15 | 70 | |
f601d847 | 71 | #ifdef HAVE___PROGNAME |
72 | extern char *__progname; | |
260d427b | 73 | #else |
74 | char *__progname; | |
75 | #endif | |
f601d847 | 76 | |
48e671d5 | 77 | /* Flag indicating whether IPv4 or IPv6. This can be set on the command line. |
78 | Default value is AF_UNSPEC means both IPv4 and IPv6. */ | |
59e76f33 | 79 | #ifdef IPV4_DEFAULT |
80 | int IPv4or6 = AF_INET; | |
81 | #else | |
48e671d5 | 82 | int IPv4or6 = AF_UNSPEC; |
59e76f33 | 83 | #endif |
48e671d5 | 84 | |
5260325f | 85 | /* Flag indicating whether debug mode is on. This can be set on the command line. */ |
8efc0c15 | 86 | int debug_flag = 0; |
87 | ||
a8be9f80 | 88 | /* Flag indicating whether a tty should be allocated */ |
8efc0c15 | 89 | int tty_flag = 0; |
8abcdba4 | 90 | int no_tty_flag = 0; |
91 | int force_tty_flag = 0; | |
8efc0c15 | 92 | |
8ce64345 | 93 | /* don't exec a shell */ |
94 | int no_shell_flag = 0; | |
8ce64345 | 95 | |
aa3378df | 96 | /* |
97 | * Flag indicating that nothing should be read from stdin. This can be set | |
98 | * on the command line. | |
99 | */ | |
8efc0c15 | 100 | int stdin_null_flag = 0; |
101 | ||
aa3378df | 102 | /* |
103 | * Flag indicating that ssh should fork after authentication. This is useful | |
104 | * so that the pasphrase can be entered manually, and then ssh goes to the | |
105 | * background. | |
106 | */ | |
8efc0c15 | 107 | int fork_after_authentication_flag = 0; |
108 | ||
aa3378df | 109 | /* |
110 | * General data structure for command line options and options configurable | |
111 | * in configuration files. See readconf.h. | |
112 | */ | |
8efc0c15 | 113 | Options options; |
114 | ||
aa3378df | 115 | /* |
116 | * Name of the host we are connecting to. This is the name given on the | |
117 | * command line, or the HostName specified for the user-supplied name in a | |
118 | * configuration file. | |
119 | */ | |
8efc0c15 | 120 | char *host; |
121 | ||
122 | /* socket address the host resolves to */ | |
48e671d5 | 123 | struct sockaddr_storage hostaddr; |
8efc0c15 | 124 | |
aa3378df | 125 | /* |
126 | * Flag to indicate that we have received a window change signal which has | |
127 | * not yet been processed. This will cause a message indicating the new | |
128 | * window size to be sent to the server a little later. This is volatile | |
129 | * because this is updated in a signal handler. | |
130 | */ | |
8efc0c15 | 131 | volatile int received_window_change_signal = 0; |
132 | ||
8efc0c15 | 133 | /* Host private key. */ |
aeaa3d9e | 134 | Key *host_private_key = NULL; |
8efc0c15 | 135 | |
136 | /* Original real UID. */ | |
137 | uid_t original_real_uid; | |
138 | ||
8ce64345 | 139 | /* command to be executed */ |
140 | Buffer command; | |
141 | ||
ae810de7 | 142 | /* Should we execute a command or invoke a subsystem? */ |
143 | int subsystem_flag = 0; | |
144 | ||
8efc0c15 | 145 | /* Prints a help message to the user. This function never returns. */ |
146 | ||
147 | void | |
5ca51e19 | 148 | usage(void) |
8efc0c15 | 149 | { |
1fe6a48f | 150 | fprintf(stderr, "Usage: %s [options] host [command]\n", __progname); |
5260325f | 151 | fprintf(stderr, "Options:\n"); |
152 | fprintf(stderr, " -l user Log in using this user name.\n"); | |
5ca51e19 | 153 | fprintf(stderr, " -n Redirect input from " _PATH_DEVNULL ".\n"); |
71276795 | 154 | fprintf(stderr, " -A Enable authentication agent forwarding.\n"); |
5260325f | 155 | fprintf(stderr, " -a Disable authentication agent forwarding.\n"); |
8efc0c15 | 156 | #ifdef AFS |
5260325f | 157 | fprintf(stderr, " -k Disable Kerberos ticket and AFS token forwarding.\n"); |
158 | #endif /* AFS */ | |
2b87da3b | 159 | fprintf(stderr, " -X Enable X11 connection forwarding.\n"); |
5260325f | 160 | fprintf(stderr, " -x Disable X11 connection forwarding.\n"); |
a01a5f30 | 161 | fprintf(stderr, " -i file Identity for public key authentication " |
162 | "(default: ~/.ssh/identity)\n"); | |
5260325f | 163 | fprintf(stderr, " -t Tty; allocate a tty even if command is given.\n"); |
8ce64345 | 164 | fprintf(stderr, " -T Do not allocate a tty.\n"); |
5260325f | 165 | fprintf(stderr, " -v Verbose; display verbose debugging messages.\n"); |
bcbf86ec | 166 | fprintf(stderr, " Multiple -v increases verbosity.\n"); |
5260325f | 167 | fprintf(stderr, " -V Display version number only.\n"); |
168 | fprintf(stderr, " -P Don't allocate a privileged port.\n"); | |
169 | fprintf(stderr, " -q Quiet; don't display any warning messages.\n"); | |
170 | fprintf(stderr, " -f Fork into background after authentication.\n"); | |
171 | fprintf(stderr, " -e char Set escape character; ``none'' = disable (default: ~).\n"); | |
172 | ||
173 | fprintf(stderr, " -c cipher Select encryption algorithm: " | |
a01a5f30 | 174 | "``3des'', ``blowfish''\n"); |
38967add | 175 | fprintf(stderr, " -m macs Specify MAC algorithms for protocol version 2.\n"); |
5260325f | 176 | fprintf(stderr, " -p port Connect to this port. Server must be on the same port.\n"); |
177 | fprintf(stderr, " -L listen-port:host:port Forward local port to remote address\n"); | |
178 | fprintf(stderr, " -R listen-port:host:port Forward remote port to local address\n"); | |
1fe6a48f | 179 | fprintf(stderr, " These cause %s to listen for connections on a port, and\n", __progname); |
5260325f | 180 | fprintf(stderr, " forward them to the other side by connecting to host:port.\n"); |
181 | fprintf(stderr, " -C Enable compression.\n"); | |
8ce64345 | 182 | fprintf(stderr, " -N Do not execute a shell or command.\n"); |
5260325f | 183 | fprintf(stderr, " -g Allow remote hosts to connect to forwarded ports.\n"); |
1f3bf5aa | 184 | fprintf(stderr, " -1 Force protocol version 1.\n"); |
185 | fprintf(stderr, " -2 Force protocol version 2.\n"); | |
48e671d5 | 186 | fprintf(stderr, " -4 Use IPv4 only.\n"); |
187 | fprintf(stderr, " -6 Use IPv6 only.\n"); | |
5260325f | 188 | fprintf(stderr, " -o 'option' Process the option as if it was read from a configuration file.\n"); |
ae810de7 | 189 | fprintf(stderr, " -s Invoke command (mandatory) as SSH2 subsystem.\n"); |
5260325f | 190 | exit(1); |
8efc0c15 | 191 | } |
192 | ||
5260325f | 193 | /* |
194 | * Connects to the given host using rsh (or prints an error message and exits | |
195 | * if rsh is not available). This function never returns. | |
196 | */ | |
8efc0c15 | 197 | void |
5260325f | 198 | rsh_connect(char *host, char *user, Buffer * command) |
8efc0c15 | 199 | { |
5260325f | 200 | char *args[10]; |
201 | int i; | |
202 | ||
203 | log("Using rsh. WARNING: Connection will not be encrypted."); | |
204 | /* Build argument list for rsh. */ | |
205 | i = 0; | |
206 | args[i++] = _PATH_RSH; | |
207 | /* host may have to come after user on some systems */ | |
208 | args[i++] = host; | |
209 | if (user) { | |
210 | args[i++] = "-l"; | |
211 | args[i++] = user; | |
212 | } | |
213 | if (buffer_len(command) > 0) { | |
214 | buffer_append(command, "\0", 1); | |
215 | args[i++] = buffer_ptr(command); | |
216 | } | |
217 | args[i++] = NULL; | |
218 | if (debug_flag) { | |
219 | for (i = 0; args[i]; i++) { | |
220 | if (i != 0) | |
221 | fprintf(stderr, " "); | |
222 | fprintf(stderr, "%s", args[i]); | |
223 | } | |
224 | fprintf(stderr, "\n"); | |
8efc0c15 | 225 | } |
5260325f | 226 | execv(_PATH_RSH, args); |
227 | perror(_PATH_RSH); | |
228 | exit(1); | |
8efc0c15 | 229 | } |
230 | ||
fa08c86b | 231 | int ssh_session(void); |
232 | int ssh_session2(void); | |
fee56204 | 233 | void load_public_identity_files(void); |
8ce64345 | 234 | |
5260325f | 235 | /* |
236 | * Main program for the ssh client. | |
237 | */ | |
8efc0c15 | 238 | int |
239 | main(int ac, char **av) | |
240 | { | |
8ce64345 | 241 | int i, opt, optind, exit_status, ok; |
57112b5a | 242 | u_short fwd_port, fwd_host_port; |
5260325f | 243 | char *optarg, *cp, buf[256]; |
5260325f | 244 | struct stat st; |
3b1a83df | 245 | struct passwd *pw; |
8ce64345 | 246 | int dummy; |
5260325f | 247 | uid_t original_effective_uid; |
5260325f | 248 | |
260d427b | 249 | __progname = get_progname(av[0]); |
264dce47 | 250 | init_rng(); |
251 | ||
aa3378df | 252 | /* |
253 | * Save the original real uid. It will be needed later (uid-swapping | |
254 | * may clobber the real uid). | |
255 | */ | |
5260325f | 256 | original_real_uid = getuid(); |
257 | original_effective_uid = geteuid(); | |
258 | ||
7322ef0e | 259 | #ifdef HAVE_SETRLIMIT |
5260325f | 260 | /* If we are installed setuid root be careful to not drop core. */ |
261 | if (original_real_uid != original_effective_uid) { | |
262 | struct rlimit rlim; | |
263 | rlim.rlim_cur = rlim.rlim_max = 0; | |
264 | if (setrlimit(RLIMIT_CORE, &rlim) < 0) | |
265 | fatal("setrlimit failed: %.100s", strerror(errno)); | |
8efc0c15 | 266 | } |
3c62e7eb | 267 | #endif |
63bd8c36 | 268 | /* Get user data. */ |
269 | pw = getpwuid(original_real_uid); | |
270 | if (!pw) { | |
271 | log("You don't exist, go away!"); | |
272 | exit(1); | |
273 | } | |
274 | /* Take a copy of the returned structure. */ | |
275 | pw = pwcopy(pw); | |
276 | ||
aa3378df | 277 | /* |
278 | * Use uid-swapping to give up root privileges for the duration of | |
279 | * option processing. We will re-instantiate the rights when we are | |
280 | * ready to create the privileged port, and will permanently drop | |
281 | * them when the port has been created (actually, when the connection | |
282 | * has been made, as we may need to create the port several times). | |
283 | */ | |
63bd8c36 | 284 | temporarily_use_uid(pw); |
5260325f | 285 | |
aa3378df | 286 | /* |
287 | * Set our umask to something reasonable, as some files are created | |
288 | * with the default umask. This will make them world-readable but | |
289 | * writable only by the owner, which is ok for all files for which we | |
290 | * don't set the modes explicitly. | |
291 | */ | |
5260325f | 292 | umask(022); |
293 | ||
5260325f | 294 | /* Initialize option structure to indicate that no values have been set. */ |
295 | initialize_options(&options); | |
296 | ||
297 | /* Parse command-line arguments. */ | |
298 | host = NULL; | |
299 | ||
5260325f | 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(); | |
b2552997 | 317 | if (strchr("eilcmpLRo", opt)) { /* options with arguments */ |
5260325f | 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) { | |
1f3bf5aa | 330 | case '1': |
331 | options.protocol = SSH_PROTO_1; | |
332 | break; | |
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': |
8abcdba4 | 385 | if (tty_flag) |
386 | force_tty_flag = 1; | |
5260325f | 387 | tty_flag = 1; |
388 | break; | |
5260325f | 389 | case 'v': |
bcbf86ec | 390 | if (0 == debug_flag) { |
391 | debug_flag = 1; | |
392 | options.log_level = SYSLOG_LEVEL_DEBUG1; | |
393 | } else if (options.log_level < SYSLOG_LEVEL_DEBUG3) { | |
394 | options.log_level++; | |
395 | break; | |
396 | } else { | |
54b974dc | 397 | fatal("Too high debugging level."); |
bcbf86ec | 398 | } |
399 | /* fallthrough */ | |
5260325f | 400 | case 'V': |
e68225b2 | 401 | fprintf(stderr, |
402 | "%s, SSH protocols %d.%d/%d.%d, OpenSSL 0x%8.8lx\n", | |
a8be9f80 | 403 | SSH_VERSION, |
404 | PROTOCOL_MAJOR_1, PROTOCOL_MINOR_1, | |
e68225b2 | 405 | PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2, |
406 | SSLeay()); | |
5260325f | 407 | if (opt == 'V') |
408 | exit(0); | |
5260325f | 409 | break; |
5260325f | 410 | case 'q': |
411 | options.log_level = SYSLOG_LEVEL_QUIET; | |
412 | break; | |
5260325f | 413 | case 'e': |
414 | if (optarg[0] == '^' && optarg[2] == 0 && | |
1e3b8b07 | 415 | (u_char) optarg[1] >= 64 && (u_char) optarg[1] < 128) |
416 | options.escape_char = (u_char) optarg[1] & 31; | |
5260325f | 417 | else if (strlen(optarg) == 1) |
1e3b8b07 | 418 | options.escape_char = (u_char) optarg[0]; |
5260325f | 419 | else if (strcmp(optarg, "none") == 0) |
420 | options.escape_char = -2; | |
421 | else { | |
422 | fprintf(stderr, "Bad escape character '%s'.\n", optarg); | |
423 | exit(1); | |
424 | } | |
425 | break; | |
5260325f | 426 | case 'c': |
a306f2dd | 427 | if (ciphers_valid(optarg)) { |
428 | /* SSH2 only */ | |
429 | options.ciphers = xstrdup(optarg); | |
d0c832f3 | 430 | options.cipher = SSH_CIPHER_ILLEGAL; |
a306f2dd | 431 | } else { |
432 | /* SSH1 only */ | |
c523303b | 433 | options.cipher = cipher_number(optarg); |
434 | if (options.cipher == -1) { | |
a306f2dd | 435 | fprintf(stderr, "Unknown cipher type '%s'\n", optarg); |
436 | exit(1); | |
437 | } | |
c523303b | 438 | if (options.cipher == SSH_CIPHER_3DES) { |
439 | options.ciphers = "3des-cbc"; | |
440 | } else if (options.cipher == SSH_CIPHER_BLOWFISH) { | |
441 | options.ciphers = "blowfish-cbc"; | |
442 | } else { | |
443 | options.ciphers = (char *)-1; | |
444 | } | |
5260325f | 445 | } |
446 | break; | |
b2552997 | 447 | case 'm': |
448 | if (mac_valid(optarg)) | |
449 | options.macs = xstrdup(optarg); | |
450 | else { | |
451 | fprintf(stderr, "Unknown mac type '%s'\n", optarg); | |
452 | exit(1); | |
453 | } | |
454 | break; | |
5260325f | 455 | case 'p': |
456 | options.port = atoi(optarg); | |
5260325f | 457 | break; |
5260325f | 458 | case 'l': |
459 | options.user = optarg; | |
460 | break; | |
5260325f | 461 | case 'R': |
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_remote_forward(&options, fwd_port, buf, fwd_host_port); | |
471 | break; | |
5260325f | 472 | case 'L': |
48e671d5 | 473 | if (sscanf(optarg, "%hu/%255[^/]/%hu", &fwd_port, buf, |
474 | &fwd_host_port) != 3 && | |
475 | sscanf(optarg, "%hu:%255[^:]:%hu", &fwd_port, buf, | |
476 | &fwd_host_port) != 3) { | |
5260325f | 477 | fprintf(stderr, "Bad forwarding specification '%s'.\n", optarg); |
478 | usage(); | |
479 | /* NOTREACHED */ | |
480 | } | |
481 | add_local_forward(&options, fwd_port, buf, fwd_host_port); | |
482 | break; | |
5260325f | 483 | case 'C': |
484 | options.compression = 1; | |
485 | break; | |
8ce64345 | 486 | case 'N': |
487 | no_shell_flag = 1; | |
488 | no_tty_flag = 1; | |
489 | break; | |
8ce64345 | 490 | case 'T': |
491 | no_tty_flag = 1; | |
492 | break; | |
5260325f | 493 | case 'o': |
494 | dummy = 1; | |
495 | if (process_config_line(&options, host ? host : "", optarg, | |
496 | "command-line", 0, &dummy) != 0) | |
497 | exit(1); | |
498 | break; | |
ae810de7 | 499 | case 's': |
500 | subsystem_flag = 1; | |
501 | break; | |
5260325f | 502 | default: |
503 | usage(); | |
504 | } | |
505 | } | |
506 | ||
507 | /* Check that we got a host name. */ | |
508 | if (!host) | |
8efc0c15 | 509 | usage(); |
5260325f | 510 | |
22d89d24 | 511 | SSLeay_add_all_algorithms(); |
fa08c86b | 512 | ERR_load_crypto_strings(); |
22d89d24 | 513 | |
5260325f | 514 | /* Initialize the command to execute on remote host. */ |
515 | buffer_init(&command); | |
516 | ||
aa3378df | 517 | /* |
518 | * Save the command to execute on the remote host in a buffer. There | |
519 | * is no limit on the length of the command, except by the maximum | |
520 | * packet size. Also sets the tty flag if there is no command. | |
521 | */ | |
5260325f | 522 | if (optind == ac) { |
523 | /* No command specified - execute shell on a tty. */ | |
524 | tty_flag = 1; | |
ae810de7 | 525 | if (subsystem_flag) { |
526 | fprintf(stderr, "You must specify a subsystem to invoke."); | |
527 | usage(); | |
528 | } | |
5260325f | 529 | } else { |
530 | /* A command has been specified. Store it into the | |
531 | buffer. */ | |
532 | for (i = optind; i < ac; i++) { | |
533 | if (i > optind) | |
534 | buffer_append(&command, " ", 1); | |
535 | buffer_append(&command, av[i], strlen(av[i])); | |
536 | } | |
8efc0c15 | 537 | } |
5260325f | 538 | |
539 | /* Cannot fork to background if no command. */ | |
14a9a859 | 540 | if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag) |
5260325f | 541 | fatal("Cannot fork into background without a command to execute."); |
542 | ||
543 | /* Allocate a tty by default if no command specified. */ | |
544 | if (buffer_len(&command) == 0) | |
545 | tty_flag = 1; | |
546 | ||
0b6fbf03 | 547 | /* Force no tty*/ |
548 | if (no_tty_flag) | |
549 | tty_flag = 0; | |
5260325f | 550 | /* Do not allocate a tty if stdin is not a tty. */ |
8abcdba4 | 551 | if (!isatty(fileno(stdin)) && !force_tty_flag) { |
5260325f | 552 | if (tty_flag) |
54b974dc | 553 | log("Pseudo-terminal will not be allocated because stdin is not a terminal."); |
5260325f | 554 | tty_flag = 0; |
555 | } | |
8ce64345 | 556 | |
20244695 | 557 | /* |
558 | * Initialize "log" output. Since we are the client all output | |
559 | * actually goes to stderr. | |
560 | */ | |
561 | log_init(av[0], SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_USER, 1); | |
5260325f | 562 | |
563 | /* Read per-user configuration file. */ | |
42f11eb2 | 564 | snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, _PATH_SSH_USER_CONFFILE); |
5260325f | 565 | read_config_file(buf, host, &options); |
566 | ||
567 | /* Read systemwide configuration file. */ | |
42f11eb2 | 568 | read_config_file(_PATH_HOST_CONFIG_FILE, host, &options); |
5260325f | 569 | |
570 | /* Fill configuration defaults. */ | |
571 | fill_default_options(&options); | |
572 | ||
573 | /* reinit */ | |
20244695 | 574 | log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 1); |
5260325f | 575 | |
e339aa53 | 576 | seed_rng(); |
577 | ||
5260325f | 578 | if (options.user == NULL) |
579 | options.user = xstrdup(pw->pw_name); | |
580 | ||
581 | if (options.hostname != NULL) | |
582 | host = options.hostname; | |
583 | ||
5260325f | 584 | /* Disable rhosts authentication if not running as root. */ |
3c62e7eb | 585 | #ifdef HAVE_CYGWIN |
586 | /* Ignore uid if running under Windows */ | |
587 | if (!options.use_privileged_port) { | |
588 | #else | |
5260325f | 589 | if (original_effective_uid != 0 || !options.use_privileged_port) { |
3c62e7eb | 590 | #endif |
6ffc9c88 | 591 | debug("Rhosts Authentication disabled, " |
592 | "originating port will not be trusted."); | |
5260325f | 593 | options.rhosts_authentication = 0; |
5260325f | 594 | } |
63bd8c36 | 595 | |
aa3378df | 596 | /* |
597 | * If using rsh has been selected, exec it now (without trying | |
598 | * anything else). Note that we must release privileges first. | |
599 | */ | |
5260325f | 600 | if (options.use_rsh) { |
aa3378df | 601 | /* |
602 | * Restore our superuser privileges. This must be done | |
603 | * before permanently setting the uid. | |
604 | */ | |
5260325f | 605 | restore_uid(); |
606 | ||
607 | /* Switch to the original uid permanently. */ | |
63bd8c36 | 608 | permanently_set_uid(pw); |
5260325f | 609 | |
610 | /* Execute rsh. */ | |
611 | rsh_connect(host, options.user, &command); | |
612 | fatal("rsh_connect returned"); | |
8efc0c15 | 613 | } |
5260325f | 614 | /* Restore our superuser privileges. */ |
615 | restore_uid(); | |
616 | ||
6ffc9c88 | 617 | /* Open a connection to the remote host. */ |
5260325f | 618 | |
619 | ok = ssh_connect(host, &hostaddr, options.port, | |
6ffc9c88 | 620 | options.connection_attempts, |
621 | original_effective_uid != 0 || !options.use_privileged_port, | |
63bd8c36 | 622 | pw, options.proxy_command); |
5260325f | 623 | |
aa3378df | 624 | /* |
625 | * If we successfully made the connection, load the host private key | |
626 | * in case we will need it later for combined rsa-rhosts | |
627 | * authentication. This must be done before releasing extra | |
628 | * privileges, because the file is only readable by root. | |
629 | */ | |
a306f2dd | 630 | if (ok && (options.protocol & SSH_PROTO_1)) { |
aeaa3d9e | 631 | host_private_key = key_load_private_type(KEY_RSA1, |
632 | _PATH_HOST_KEY_FILE, "", NULL); | |
5260325f | 633 | } |
aa3378df | 634 | /* |
635 | * Get rid of any extra privileges that we may have. We will no | |
636 | * longer need them. Also, extra privileges could make it very hard | |
637 | * to read identity files and other non-world-readable files from the | |
638 | * user's home directory if it happens to be on a NFS volume where | |
639 | * root is mapped to nobody. | |
640 | */ | |
641 | ||
642 | /* | |
643 | * Note that some legacy systems need to postpone the following call | |
644 | * to permanently_set_uid() until the private hostkey is destroyed | |
645 | * with RSA_free(). Otherwise the calling user could ptrace() the | |
646 | * process, read the private hostkey and impersonate the host. | |
647 | * OpenBSD does not allow ptracing of setuid processes. | |
648 | */ | |
63bd8c36 | 649 | permanently_set_uid(pw); |
5260325f | 650 | |
aa3378df | 651 | /* |
652 | * Now that we are back to our own permissions, create ~/.ssh | |
653 | * directory if it doesn\'t already exist. | |
654 | */ | |
42f11eb2 | 655 | snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, _PATH_SSH_USER_DIR); |
5260325f | 656 | if (stat(buf, &st) < 0) |
704b1659 | 657 | if (mkdir(buf, 0700) < 0) |
5260325f | 658 | error("Could not create directory '%.200s'.", buf); |
659 | ||
660 | /* Check if the connection failed, and try "rsh" if appropriate. */ | |
661 | if (!ok) { | |
662 | if (options.port != 0) | |
57112b5a | 663 | log("Secure connection to %.100s on port %hu refused%.100s.", |
5260325f | 664 | host, options.port, |
665 | options.fallback_to_rsh ? "; reverting to insecure method" : ""); | |
666 | else | |
667 | log("Secure connection to %.100s refused%.100s.", host, | |
668 | options.fallback_to_rsh ? "; reverting to insecure method" : ""); | |
669 | ||
670 | if (options.fallback_to_rsh) { | |
671 | rsh_connect(host, options.user, &command); | |
672 | fatal("rsh_connect returned"); | |
673 | } | |
674 | exit(1); | |
8efc0c15 | 675 | } |
fee56204 | 676 | /* load options.identity_files */ |
677 | load_public_identity_files(); | |
678 | ||
679 | /* Expand ~ in known host file names. */ | |
680 | /* XXX mem-leaks: */ | |
fa08c86b | 681 | options.system_hostfile = |
682 | tilde_expand_filename(options.system_hostfile, original_real_uid); | |
683 | options.user_hostfile = | |
684 | tilde_expand_filename(options.user_hostfile, original_real_uid); | |
685 | options.system_hostfile2 = | |
686 | tilde_expand_filename(options.system_hostfile2, original_real_uid); | |
687 | options.user_hostfile2 = | |
688 | tilde_expand_filename(options.user_hostfile2, original_real_uid); | |
5260325f | 689 | |
690 | /* Log into the remote system. This never returns if the login fails. */ | |
63bd8c36 | 691 | ssh_login(host_private_key, host, (struct sockaddr *)&hostaddr, pw); |
5260325f | 692 | |
693 | /* We no longer need the host private key. Clear it now. */ | |
aeaa3d9e | 694 | if (host_private_key != NULL) |
695 | key_free(host_private_key); /* Destroys contents safely */ | |
5260325f | 696 | |
8ce64345 | 697 | exit_status = compat20 ? ssh_session2() : ssh_session(); |
698 | packet_close(); | |
699 | return exit_status; | |
700 | } | |
701 | ||
0b242b12 | 702 | void |
703 | x11_get_proto(char *proto, int proto_len, char *data, int data_len) | |
704 | { | |
705 | char line[512]; | |
706 | FILE *f; | |
707 | int got_data = 0, i; | |
708 | ||
fa649821 | 709 | if (options.xauth_location) { |
710 | /* Try to get Xauthority information for the display. */ | |
5ca51e19 | 711 | snprintf(line, sizeof line, "%.100s list %.200s 2>" _PATH_DEVNULL, |
fa649821 | 712 | options.xauth_location, getenv("DISPLAY")); |
713 | f = popen(line, "r"); | |
714 | if (f && fgets(line, sizeof(line), f) && | |
715 | sscanf(line, "%*s %s %s", proto, data) == 2) | |
716 | got_data = 1; | |
717 | if (f) | |
718 | pclose(f); | |
719 | } | |
0b242b12 | 720 | /* |
721 | * If we didn't get authentication data, just make up some | |
722 | * data. The forwarding code will check the validity of the | |
723 | * response anyway, and substitute this data. The X11 | |
724 | * server, however, will ignore this fake data and use | |
725 | * whatever authentication mechanisms it was using otherwise | |
726 | * for the local connection. | |
727 | */ | |
728 | if (!got_data) { | |
729 | u_int32_t rand = 0; | |
730 | ||
731 | strlcpy(proto, "MIT-MAGIC-COOKIE-1", proto_len); | |
732 | for (i = 0; i < 16; i++) { | |
733 | if (i % 4 == 0) | |
734 | rand = arc4random(); | |
735 | snprintf(data + 2 * i, data_len - 2 * i, "%02x", rand & 0xff); | |
736 | rand >>= 8; | |
737 | } | |
738 | } | |
739 | } | |
740 | ||
fa08c86b | 741 | void |
742 | ssh_init_forwarding(void) | |
743 | { | |
02a024dd | 744 | int success = 0; |
fa08c86b | 745 | int i; |
02a024dd | 746 | |
fa08c86b | 747 | /* Initiate local TCP/IP port forwardings. */ |
748 | for (i = 0; i < options.num_local_forwards; i++) { | |
749 | debug("Connections to local port %d forwarded to remote address %.200s:%d", | |
750 | options.local_forwards[i].port, | |
751 | options.local_forwards[i].host, | |
752 | options.local_forwards[i].host_port); | |
02a024dd | 753 | success += channel_request_local_forwarding( |
fa08c86b | 754 | options.local_forwards[i].port, |
755 | options.local_forwards[i].host, | |
756 | options.local_forwards[i].host_port, | |
757 | options.gateway_ports); | |
758 | } | |
02a024dd | 759 | if (i > 0 && success == 0) |
760 | error("Could not request local forwarding."); | |
fa08c86b | 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. */ | |
b5c334cc | 877 | packet_set_interactive(interactive); |
5260325f | 878 | |
879 | /* Request authentication agent forwarding if appropriate. */ | |
fa08c86b | 880 | check_agent_present(); |
881 | ||
5260325f | 882 | if (options.forward_agent) { |
883 | debug("Requesting authentication agent forwarding."); | |
884 | auth_request_forwarding(); | |
885 | ||
886 | /* Read response from the server. */ | |
887 | type = packet_read(&plen); | |
888 | packet_integrity_check(plen, 0, type); | |
889 | if (type != SSH_SMSG_SUCCESS) | |
890 | log("Warning: Remote host denied authentication agent forwarding."); | |
891 | } | |
8efc0c15 | 892 | |
fa08c86b | 893 | /* Initiate port forwardings. */ |
894 | ssh_init_forwarding(); | |
5260325f | 895 | |
aa3378df | 896 | /* If requested, let ssh continue in the background. */ |
6ae2364d | 897 | if (fork_after_authentication_flag) |
aa3378df | 898 | if (daemon(1, 1) < 0) |
899 | fatal("daemon() failed: %.200s", strerror(errno)); | |
900 | ||
901 | /* | |
902 | * If a command was specified on the command line, execute the | |
903 | * command now. Otherwise request the server to start a shell. | |
904 | */ | |
5260325f | 905 | if (buffer_len(&command) > 0) { |
906 | int len = buffer_len(&command); | |
907 | if (len > 900) | |
908 | len = 900; | |
909 | debug("Sending command: %.*s", len, buffer_ptr(&command)); | |
910 | packet_start(SSH_CMSG_EXEC_CMD); | |
911 | packet_put_string(buffer_ptr(&command), buffer_len(&command)); | |
912 | packet_send(); | |
913 | packet_write_wait(); | |
914 | } else { | |
915 | debug("Requesting shell."); | |
916 | packet_start(SSH_CMSG_EXEC_SHELL); | |
917 | packet_send(); | |
918 | packet_write_wait(); | |
919 | } | |
920 | ||
921 | /* Enter the interactive session. */ | |
2e73a022 | 922 | return client_loop(have_tty, tty_flag ? options.escape_char : -1, 0); |
8ce64345 | 923 | } |
5260325f | 924 | |
1f3bf5aa | 925 | void |
926 | client_subsystem_reply(int type, int plen, void *ctxt) | |
927 | { | |
928 | int id, len; | |
929 | ||
930 | id = packet_get_int(); | |
931 | len = buffer_len(&command); | |
ce91d6f8 | 932 | if (len > 900) |
933 | len = 900; | |
1f3bf5aa | 934 | packet_done(); |
935 | if (type == SSH2_MSG_CHANNEL_FAILURE) | |
936 | fatal("Request for subsystem '%.*s' failed on channel %d", | |
937 | len, buffer_ptr(&command), id); | |
938 | } | |
939 | ||
8ce64345 | 940 | void |
fa08c86b | 941 | ssh_session2_callback(int id, void *arg) |
8ce64345 | 942 | { |
943 | int len; | |
b5c334cc | 944 | int interactive = 0; |
945 | ||
6a416424 | 946 | debug("client_init id %d arg %ld", id, (long)arg); |
8ce64345 | 947 | |
8ce64345 | 948 | if (tty_flag) { |
949 | struct winsize ws; | |
950 | char *cp; | |
951 | cp = getenv("TERM"); | |
952 | if (!cp) | |
953 | cp = ""; | |
954 | /* Store window size in the packet. */ | |
955 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) | |
956 | memset(&ws, 0, sizeof(ws)); | |
957 | ||
958 | channel_request_start(id, "pty-req", 0); | |
959 | packet_put_cstring(cp); | |
960 | packet_put_int(ws.ws_col); | |
961 | packet_put_int(ws.ws_row); | |
962 | packet_put_int(ws.ws_xpixel); | |
963 | packet_put_int(ws.ws_ypixel); | |
964 | packet_put_cstring(""); /* XXX: encode terminal modes */ | |
965 | packet_send(); | |
b5c334cc | 966 | interactive = 1; |
8ce64345 | 967 | /* XXX wait for reply */ |
968 | } | |
0b242b12 | 969 | if (options.forward_x11 && |
970 | getenv("DISPLAY") != NULL) { | |
971 | char proto[512], data[512]; | |
972 | /* Get reasonable local authentication information. */ | |
973 | x11_get_proto(proto, sizeof proto, data, sizeof data); | |
974 | /* Request forwarding with authentication spoofing. */ | |
975 | debug("Requesting X11 forwarding with authentication spoofing."); | |
976 | x11_request_forwarding_with_spoofing(id, proto, data); | |
b5c334cc | 977 | interactive = 1; |
0b242b12 | 978 | /* XXX wait for reply */ |
979 | } | |
980 | ||
fa08c86b | 981 | check_agent_present(); |
982 | if (options.forward_agent) { | |
983 | debug("Requesting authentication agent forwarding."); | |
984 | channel_request_start(id, "auth-agent-req@openssh.com", 0); | |
985 | packet_send(); | |
986 | } | |
987 | ||
8ce64345 | 988 | len = buffer_len(&command); |
989 | if (len > 0) { | |
990 | if (len > 900) | |
991 | len = 900; | |
ae810de7 | 992 | if (subsystem_flag) { |
993 | debug("Sending subsystem: %.*s", len, buffer_ptr(&command)); | |
1f3bf5aa | 994 | channel_request_start(id, "subsystem", /*want reply*/ 1); |
995 | /* register callback for reply */ | |
996 | /* XXX we asume that client_loop has already been called */ | |
997 | dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &client_subsystem_reply); | |
998 | dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &client_subsystem_reply); | |
ae810de7 | 999 | } else { |
1000 | debug("Sending command: %.*s", len, buffer_ptr(&command)); | |
1001 | channel_request_start(id, "exec", 0); | |
1002 | } | |
ce91d6f8 | 1003 | packet_put_string(buffer_ptr(&command), buffer_len(&command)); |
8ce64345 | 1004 | packet_send(); |
1005 | } else { | |
1006 | channel_request(id, "shell", 0); | |
1007 | } | |
1008 | /* channel_callback(id, SSH2_MSG_OPEN_CONFIGMATION, client_init, 0); */ | |
1f3bf5aa | 1009 | |
8ce64345 | 1010 | /* register different callback, etc. XXX */ |
b5c334cc | 1011 | packet_set_interactive(interactive); |
8ce64345 | 1012 | } |
1013 | ||
1014 | int | |
eb0dd41f | 1015 | ssh_session2_command(void) |
8ce64345 | 1016 | { |
eb0dd41f | 1017 | int id, window, packetmax; |
2e73a022 | 1018 | int in, out, err; |
1019 | ||
14a9a859 | 1020 | if (stdin_null_flag) { |
5ca51e19 | 1021 | in = open(_PATH_DEVNULL, O_RDONLY); |
14a9a859 | 1022 | } else { |
1023 | in = dup(STDIN_FILENO); | |
1024 | } | |
2e73a022 | 1025 | out = dup(STDOUT_FILENO); |
1026 | err = dup(STDERR_FILENO); | |
8ce64345 | 1027 | |
1028 | if (in < 0 || out < 0 || err < 0) | |
14a9a859 | 1029 | fatal("dup() in/out/err failed"); |
8ce64345 | 1030 | |
a22aff1f | 1031 | /* enable nonblocking unless tty */ |
1032 | if (!isatty(in)) | |
1033 | set_nonblock(in); | |
1034 | if (!isatty(out)) | |
1035 | set_nonblock(out); | |
1036 | if (!isatty(err)) | |
1037 | set_nonblock(err); | |
1038 | ||
bcbf86ec | 1039 | window = CHAN_SES_WINDOW_DEFAULT; |
1040 | packetmax = CHAN_SES_PACKET_DEFAULT; | |
1041 | if (!tty_flag) { | |
8ce64345 | 1042 | window *= 2; |
bcbf86ec | 1043 | packetmax *=2; |
8ce64345 | 1044 | } |
8ce64345 | 1045 | id = channel_new( |
1046 | "session", SSH_CHANNEL_OPENING, in, out, err, | |
bcbf86ec | 1047 | window, packetmax, CHAN_EXTENDED_WRITE, |
a22aff1f | 1048 | xstrdup("client-session"), /*nonblock*/0); |
8ce64345 | 1049 | |
eb0dd41f | 1050 | debug("channel_new: %d", id); |
1051 | ||
8ce64345 | 1052 | channel_open(id); |
fa08c86b | 1053 | channel_register_callback(id, SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, |
1054 | ssh_session2_callback, (void *)0); | |
5260325f | 1055 | |
eb0dd41f | 1056 | return id; |
1057 | } | |
1058 | ||
1059 | int | |
1060 | ssh_session2(void) | |
1061 | { | |
1062 | int id; | |
1063 | ||
1064 | /* XXX should be pre-session */ | |
1065 | ssh_init_forwarding(); | |
1066 | ||
1067 | id = no_shell_flag ? -1 : ssh_session2_command(); | |
1068 | ||
1069 | /* If requested, let ssh continue in the background. */ | |
1070 | if (fork_after_authentication_flag) | |
1071 | if (daemon(1, 1) < 0) | |
1072 | fatal("daemon() failed: %.200s", strerror(errno)); | |
1073 | ||
2e73a022 | 1074 | return client_loop(tty_flag, tty_flag ? options.escape_char : -1, id); |
8efc0c15 | 1075 | } |
fa08c86b | 1076 | |
fee56204 | 1077 | void |
1078 | load_public_identity_files(void) | |
1079 | { | |
1080 | char *filename; | |
1081 | Key *public; | |
1082 | int i; | |
1083 | ||
1084 | for (i = 0; i < options.num_identity_files; i++) { | |
1085 | filename = tilde_expand_filename(options.identity_files[i], | |
1086 | original_real_uid); | |
aeaa3d9e | 1087 | public = key_load_public(filename, NULL); |
fee56204 | 1088 | debug("identity file %s type %d", filename, |
1089 | public ? public->type : -1); | |
1090 | xfree(options.identity_files[i]); | |
1091 | options.identity_files[i] = filename; | |
1092 | options.identity_keys[i] = public; | |
1093 | } | |
1094 | } |