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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" | |
383546c4 | 42 | RCSID("$OpenBSD: ssh.c,v 1.127 2001/06/26 20:14:11 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" |
a5efa1bb | 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" | |
30dcc918 | 70 | #include "sshtty.h" |
8efc0c15 | 71 | |
383546c4 | 72 | #ifdef SMARTCARD |
73 | #include <openssl/engine.h> | |
74 | #include "scard.h" | |
75 | #endif | |
76 | ||
f601d847 | 77 | #ifdef HAVE___PROGNAME |
78 | extern char *__progname; | |
260d427b | 79 | #else |
80 | char *__progname; | |
81 | #endif | |
f601d847 | 82 | |
48e671d5 | 83 | /* Flag indicating whether IPv4 or IPv6. This can be set on the command line. |
84 | Default value is AF_UNSPEC means both IPv4 and IPv6. */ | |
59e76f33 | 85 | #ifdef IPV4_DEFAULT |
86 | int IPv4or6 = AF_INET; | |
87 | #else | |
48e671d5 | 88 | int IPv4or6 = AF_UNSPEC; |
59e76f33 | 89 | #endif |
48e671d5 | 90 | |
5260325f | 91 | /* Flag indicating whether debug mode is on. This can be set on the command line. */ |
8efc0c15 | 92 | int debug_flag = 0; |
93 | ||
a8be9f80 | 94 | /* Flag indicating whether a tty should be allocated */ |
8efc0c15 | 95 | int tty_flag = 0; |
8abcdba4 | 96 | int no_tty_flag = 0; |
97 | int force_tty_flag = 0; | |
8efc0c15 | 98 | |
8ce64345 | 99 | /* don't exec a shell */ |
100 | int no_shell_flag = 0; | |
8ce64345 | 101 | |
aa3378df | 102 | /* |
103 | * Flag indicating that nothing should be read from stdin. This can be set | |
104 | * on the command line. | |
105 | */ | |
8efc0c15 | 106 | int stdin_null_flag = 0; |
107 | ||
aa3378df | 108 | /* |
109 | * Flag indicating that ssh should fork after authentication. This is useful | |
110 | * so that the pasphrase can be entered manually, and then ssh goes to the | |
111 | * background. | |
112 | */ | |
8efc0c15 | 113 | int fork_after_authentication_flag = 0; |
114 | ||
aa3378df | 115 | /* |
116 | * General data structure for command line options and options configurable | |
117 | * in configuration files. See readconf.h. | |
118 | */ | |
8efc0c15 | 119 | Options options; |
120 | ||
aa3378df | 121 | /* |
122 | * Name of the host we are connecting to. This is the name given on the | |
123 | * command line, or the HostName specified for the user-supplied name in a | |
124 | * configuration file. | |
125 | */ | |
8efc0c15 | 126 | char *host; |
127 | ||
128 | /* socket address the host resolves to */ | |
48e671d5 | 129 | struct sockaddr_storage hostaddr; |
8efc0c15 | 130 | |
aa3378df | 131 | /* |
132 | * Flag to indicate that we have received a window change signal which has | |
133 | * not yet been processed. This will cause a message indicating the new | |
134 | * window size to be sent to the server a little later. This is volatile | |
135 | * because this is updated in a signal handler. | |
136 | */ | |
8efc0c15 | 137 | volatile int received_window_change_signal = 0; |
138 | ||
8002af61 | 139 | /* Private host keys. */ |
140 | struct { | |
141 | Key **keys; | |
142 | int nkeys; | |
143 | } sensitive_data; | |
8efc0c15 | 144 | |
145 | /* Original real UID. */ | |
146 | uid_t original_real_uid; | |
147 | ||
8ce64345 | 148 | /* command to be executed */ |
149 | Buffer command; | |
150 | ||
ae810de7 | 151 | /* Should we execute a command or invoke a subsystem? */ |
152 | int subsystem_flag = 0; | |
153 | ||
383546c4 | 154 | #ifdef SMARTCARD |
155 | /* Smartcard reader id */ | |
156 | int sc_reader_num = -1; | |
157 | #endif | |
158 | ||
8efc0c15 | 159 | /* Prints a help message to the user. This function never returns. */ |
160 | ||
396c147e | 161 | static void |
5ca51e19 | 162 | usage(void) |
8efc0c15 | 163 | { |
1fe6a48f | 164 | fprintf(stderr, "Usage: %s [options] host [command]\n", __progname); |
5260325f | 165 | fprintf(stderr, "Options:\n"); |
166 | fprintf(stderr, " -l user Log in using this user name.\n"); | |
5ca51e19 | 167 | fprintf(stderr, " -n Redirect input from " _PATH_DEVNULL ".\n"); |
71276795 | 168 | fprintf(stderr, " -A Enable authentication agent forwarding.\n"); |
63cd7dd0 | 169 | fprintf(stderr, " -a Disable authentication agent forwarding (default).\n"); |
8efc0c15 | 170 | #ifdef AFS |
5260325f | 171 | fprintf(stderr, " -k Disable Kerberos ticket and AFS token forwarding.\n"); |
172 | #endif /* AFS */ | |
2b87da3b | 173 | fprintf(stderr, " -X Enable X11 connection forwarding.\n"); |
63cd7dd0 | 174 | fprintf(stderr, " -x Disable X11 connection forwarding (default).\n"); |
a01a5f30 | 175 | fprintf(stderr, " -i file Identity for public key authentication " |
176 | "(default: ~/.ssh/identity)\n"); | |
5260325f | 177 | fprintf(stderr, " -t Tty; allocate a tty even if command is given.\n"); |
8ce64345 | 178 | fprintf(stderr, " -T Do not allocate a tty.\n"); |
5260325f | 179 | fprintf(stderr, " -v Verbose; display verbose debugging messages.\n"); |
bcbf86ec | 180 | fprintf(stderr, " Multiple -v increases verbosity.\n"); |
5260325f | 181 | fprintf(stderr, " -V Display version number only.\n"); |
182 | fprintf(stderr, " -P Don't allocate a privileged port.\n"); | |
183 | fprintf(stderr, " -q Quiet; don't display any warning messages.\n"); | |
184 | fprintf(stderr, " -f Fork into background after authentication.\n"); | |
185 | fprintf(stderr, " -e char Set escape character; ``none'' = disable (default: ~).\n"); | |
186 | ||
63cd7dd0 | 187 | fprintf(stderr, " -c cipher Select encryption algorithm\n"); |
38967add | 188 | fprintf(stderr, " -m macs Specify MAC algorithms for protocol version 2.\n"); |
5260325f | 189 | fprintf(stderr, " -p port Connect to this port. Server must be on the same port.\n"); |
190 | fprintf(stderr, " -L listen-port:host:port Forward local port to remote address\n"); | |
191 | fprintf(stderr, " -R listen-port:host:port Forward remote port to local address\n"); | |
1fe6a48f | 192 | fprintf(stderr, " These cause %s to listen for connections on a port, and\n", __progname); |
5260325f | 193 | fprintf(stderr, " forward them to the other side by connecting to host:port.\n"); |
194 | fprintf(stderr, " -C Enable compression.\n"); | |
8ce64345 | 195 | fprintf(stderr, " -N Do not execute a shell or command.\n"); |
5260325f | 196 | fprintf(stderr, " -g Allow remote hosts to connect to forwarded ports.\n"); |
1f3bf5aa | 197 | fprintf(stderr, " -1 Force protocol version 1.\n"); |
198 | fprintf(stderr, " -2 Force protocol version 2.\n"); | |
48e671d5 | 199 | fprintf(stderr, " -4 Use IPv4 only.\n"); |
200 | fprintf(stderr, " -6 Use IPv6 only.\n"); | |
5260325f | 201 | fprintf(stderr, " -o 'option' Process the option as if it was read from a configuration file.\n"); |
ae810de7 | 202 | fprintf(stderr, " -s Invoke command (mandatory) as SSH2 subsystem.\n"); |
63cd7dd0 | 203 | fprintf(stderr, " -b addr Local IP address.\n"); |
5260325f | 204 | exit(1); |
8efc0c15 | 205 | } |
206 | ||
5260325f | 207 | /* |
208 | * Connects to the given host using rsh (or prints an error message and exits | |
209 | * if rsh is not available). This function never returns. | |
210 | */ | |
396c147e | 211 | static void |
5260325f | 212 | rsh_connect(char *host, char *user, Buffer * command) |
8efc0c15 | 213 | { |
5260325f | 214 | char *args[10]; |
215 | int i; | |
216 | ||
217 | log("Using rsh. WARNING: Connection will not be encrypted."); | |
218 | /* Build argument list for rsh. */ | |
219 | i = 0; | |
220 | args[i++] = _PATH_RSH; | |
221 | /* host may have to come after user on some systems */ | |
222 | args[i++] = host; | |
223 | if (user) { | |
224 | args[i++] = "-l"; | |
225 | args[i++] = user; | |
226 | } | |
227 | if (buffer_len(command) > 0) { | |
228 | buffer_append(command, "\0", 1); | |
229 | args[i++] = buffer_ptr(command); | |
230 | } | |
231 | args[i++] = NULL; | |
232 | if (debug_flag) { | |
233 | for (i = 0; args[i]; i++) { | |
234 | if (i != 0) | |
235 | fprintf(stderr, " "); | |
236 | fprintf(stderr, "%s", args[i]); | |
237 | } | |
238 | fprintf(stderr, "\n"); | |
8efc0c15 | 239 | } |
5260325f | 240 | execv(_PATH_RSH, args); |
241 | perror(_PATH_RSH); | |
242 | exit(1); | |
8efc0c15 | 243 | } |
244 | ||
396c147e | 245 | static int ssh_session(void); |
246 | static int ssh_session2(void); | |
247 | static void load_public_identity_files(void); | |
8ce64345 | 248 | |
5260325f | 249 | /* |
250 | * Main program for the ssh client. | |
251 | */ | |
8efc0c15 | 252 | int |
253 | main(int ac, char **av) | |
254 | { | |
8ce64345 | 255 | int i, opt, optind, exit_status, ok; |
57112b5a | 256 | u_short fwd_port, fwd_host_port; |
2e000c58 | 257 | char *optarg, *p, *cp, buf[256]; |
5260325f | 258 | struct stat st; |
3b1a83df | 259 | struct passwd *pw; |
8ce64345 | 260 | int dummy; |
5260325f | 261 | uid_t original_effective_uid; |
5260325f | 262 | |
260d427b | 263 | __progname = get_progname(av[0]); |
264dce47 | 264 | init_rng(); |
265 | ||
aa3378df | 266 | /* |
267 | * Save the original real uid. It will be needed later (uid-swapping | |
268 | * may clobber the real uid). | |
269 | */ | |
5260325f | 270 | original_real_uid = getuid(); |
271 | original_effective_uid = geteuid(); | |
272 | ||
7322ef0e | 273 | #ifdef HAVE_SETRLIMIT |
5260325f | 274 | /* If we are installed setuid root be careful to not drop core. */ |
275 | if (original_real_uid != original_effective_uid) { | |
276 | struct rlimit rlim; | |
277 | rlim.rlim_cur = rlim.rlim_max = 0; | |
278 | if (setrlimit(RLIMIT_CORE, &rlim) < 0) | |
279 | fatal("setrlimit failed: %.100s", strerror(errno)); | |
8efc0c15 | 280 | } |
3c62e7eb | 281 | #endif |
63bd8c36 | 282 | /* Get user data. */ |
283 | pw = getpwuid(original_real_uid); | |
284 | if (!pw) { | |
285 | log("You don't exist, go away!"); | |
286 | exit(1); | |
287 | } | |
288 | /* Take a copy of the returned structure. */ | |
289 | pw = pwcopy(pw); | |
290 | ||
aa3378df | 291 | /* |
292 | * Use uid-swapping to give up root privileges for the duration of | |
293 | * option processing. We will re-instantiate the rights when we are | |
294 | * ready to create the privileged port, and will permanently drop | |
295 | * them when the port has been created (actually, when the connection | |
296 | * has been made, as we may need to create the port several times). | |
297 | */ | |
63bd8c36 | 298 | temporarily_use_uid(pw); |
5260325f | 299 | |
aa3378df | 300 | /* |
301 | * Set our umask to something reasonable, as some files are created | |
302 | * with the default umask. This will make them world-readable but | |
303 | * writable only by the owner, which is ok for all files for which we | |
304 | * don't set the modes explicitly. | |
305 | */ | |
5260325f | 306 | umask(022); |
307 | ||
5260325f | 308 | /* Initialize option structure to indicate that no values have been set. */ |
309 | initialize_options(&options); | |
310 | ||
311 | /* Parse command-line arguments. */ | |
312 | host = NULL; | |
313 | ||
5260325f | 314 | for (optind = 1; optind < ac; optind++) { |
315 | if (av[optind][0] != '-') { | |
316 | if (host) | |
317 | break; | |
2e000c58 | 318 | if (strchr(av[optind], '@')) { |
319 | p = xstrdup(av[optind]); | |
320 | cp = strchr(p, '@'); | |
321 | if(cp == NULL || cp == p) | |
6ae2364d | 322 | usage(); |
2e000c58 | 323 | options.user = p; |
5260325f | 324 | *cp = '\0'; |
325 | host = ++cp; | |
326 | } else | |
327 | host = av[optind]; | |
328 | continue; | |
329 | } | |
330 | opt = av[optind][1]; | |
331 | if (!opt) | |
332 | usage(); | |
383546c4 | 333 | if (strchr("eilcmpbILRDo", opt)) { /* options with arguments */ |
5260325f | 334 | optarg = av[optind] + 2; |
335 | if (strcmp(optarg, "") == 0) { | |
336 | if (optind >= ac - 1) | |
337 | usage(); | |
338 | optarg = av[++optind]; | |
339 | } | |
340 | } else { | |
341 | if (av[optind][2]) | |
342 | usage(); | |
343 | optarg = NULL; | |
344 | } | |
345 | switch (opt) { | |
1f3bf5aa | 346 | case '1': |
347 | options.protocol = SSH_PROTO_1; | |
348 | break; | |
6ae2364d | 349 | case '2': |
350 | options.protocol = SSH_PROTO_2; | |
351 | break; | |
48e671d5 | 352 | case '4': |
353 | IPv4or6 = AF_INET; | |
354 | break; | |
48e671d5 | 355 | case '6': |
356 | IPv4or6 = AF_INET6; | |
357 | break; | |
5260325f | 358 | case 'n': |
359 | stdin_null_flag = 1; | |
360 | break; | |
5260325f | 361 | case 'f': |
362 | fork_after_authentication_flag = 1; | |
363 | stdin_null_flag = 1; | |
364 | break; | |
5260325f | 365 | case 'x': |
366 | options.forward_x11 = 0; | |
367 | break; | |
5260325f | 368 | case 'X': |
369 | options.forward_x11 = 1; | |
370 | break; | |
5260325f | 371 | case 'g': |
372 | options.gateway_ports = 1; | |
373 | break; | |
5260325f | 374 | case 'P': |
375 | options.use_privileged_port = 0; | |
376 | break; | |
5260325f | 377 | case 'a': |
378 | options.forward_agent = 0; | |
379 | break; | |
71276795 | 380 | case 'A': |
381 | options.forward_agent = 1; | |
382 | break; | |
5260325f | 383 | #ifdef AFS |
384 | case 'k': | |
385 | options.kerberos_tgt_passing = 0; | |
386 | options.afs_token_passing = 0; | |
387 | break; | |
388 | #endif | |
389 | case 'i': | |
390 | if (stat(optarg, &st) < 0) { | |
391 | fprintf(stderr, "Warning: Identity file %s does not exist.\n", | |
fa08c86b | 392 | optarg); |
5260325f | 393 | break; |
394 | } | |
395 | if (options.num_identity_files >= SSH_MAX_IDENTITY_FILES) | |
396 | fatal("Too many identity files specified (max %d)", | |
fa08c86b | 397 | SSH_MAX_IDENTITY_FILES); |
398 | options.identity_files[options.num_identity_files++] = xstrdup(optarg); | |
5260325f | 399 | break; |
383546c4 | 400 | case 'I': |
401 | #ifdef SMARTCARD | |
402 | sc_reader_num = atoi(optarg); | |
403 | #else | |
404 | fprintf(stderr, "no support for smartcards.\n"); | |
405 | #endif | |
406 | break; | |
5260325f | 407 | case 't': |
8abcdba4 | 408 | if (tty_flag) |
409 | force_tty_flag = 1; | |
5260325f | 410 | tty_flag = 1; |
411 | break; | |
5260325f | 412 | case 'v': |
bcbf86ec | 413 | if (0 == debug_flag) { |
414 | debug_flag = 1; | |
415 | options.log_level = SYSLOG_LEVEL_DEBUG1; | |
416 | } else if (options.log_level < SYSLOG_LEVEL_DEBUG3) { | |
417 | options.log_level++; | |
418 | break; | |
419 | } else { | |
54b974dc | 420 | fatal("Too high debugging level."); |
bcbf86ec | 421 | } |
422 | /* fallthrough */ | |
5260325f | 423 | case 'V': |
e68225b2 | 424 | fprintf(stderr, |
425 | "%s, SSH protocols %d.%d/%d.%d, OpenSSL 0x%8.8lx\n", | |
a8be9f80 | 426 | SSH_VERSION, |
427 | PROTOCOL_MAJOR_1, PROTOCOL_MINOR_1, | |
e68225b2 | 428 | PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2, |
429 | SSLeay()); | |
5260325f | 430 | if (opt == 'V') |
431 | exit(0); | |
5260325f | 432 | break; |
5260325f | 433 | case 'q': |
434 | options.log_level = SYSLOG_LEVEL_QUIET; | |
435 | break; | |
5260325f | 436 | case 'e': |
437 | if (optarg[0] == '^' && optarg[2] == 0 && | |
1e3b8b07 | 438 | (u_char) optarg[1] >= 64 && (u_char) optarg[1] < 128) |
439 | options.escape_char = (u_char) optarg[1] & 31; | |
5260325f | 440 | else if (strlen(optarg) == 1) |
1e3b8b07 | 441 | options.escape_char = (u_char) optarg[0]; |
5260325f | 442 | else if (strcmp(optarg, "none") == 0) |
4bf9c10e | 443 | options.escape_char = SSH_ESCAPECHAR_NONE; |
5260325f | 444 | else { |
445 | fprintf(stderr, "Bad escape character '%s'.\n", optarg); | |
446 | exit(1); | |
447 | } | |
448 | break; | |
5260325f | 449 | case 'c': |
a306f2dd | 450 | if (ciphers_valid(optarg)) { |
451 | /* SSH2 only */ | |
452 | options.ciphers = xstrdup(optarg); | |
d0c832f3 | 453 | options.cipher = SSH_CIPHER_ILLEGAL; |
a306f2dd | 454 | } else { |
455 | /* SSH1 only */ | |
c523303b | 456 | options.cipher = cipher_number(optarg); |
457 | if (options.cipher == -1) { | |
a306f2dd | 458 | fprintf(stderr, "Unknown cipher type '%s'\n", optarg); |
459 | exit(1); | |
460 | } | |
c523303b | 461 | if (options.cipher == SSH_CIPHER_3DES) { |
462 | options.ciphers = "3des-cbc"; | |
463 | } else if (options.cipher == SSH_CIPHER_BLOWFISH) { | |
464 | options.ciphers = "blowfish-cbc"; | |
465 | } else { | |
466 | options.ciphers = (char *)-1; | |
467 | } | |
5260325f | 468 | } |
469 | break; | |
b2552997 | 470 | case 'm': |
471 | if (mac_valid(optarg)) | |
472 | options.macs = xstrdup(optarg); | |
473 | else { | |
474 | fprintf(stderr, "Unknown mac type '%s'\n", optarg); | |
475 | exit(1); | |
476 | } | |
477 | break; | |
5260325f | 478 | case 'p': |
2d2a2c65 | 479 | options.port = a2port(optarg); |
480 | if (options.port == 0) { | |
6031af8d | 481 | fprintf(stderr, "Bad port '%s'\n", optarg); |
482 | exit(1); | |
483 | } | |
5260325f | 484 | break; |
5260325f | 485 | case 'l': |
486 | options.user = optarg; | |
487 | break; | |
5260325f | 488 | case 'R': |
48e671d5 | 489 | if (sscanf(optarg, "%hu/%255[^/]/%hu", &fwd_port, buf, |
490 | &fwd_host_port) != 3 && | |
491 | sscanf(optarg, "%hu:%255[^:]:%hu", &fwd_port, buf, | |
492 | &fwd_host_port) != 3) { | |
5260325f | 493 | fprintf(stderr, "Bad forwarding specification '%s'.\n", optarg); |
494 | usage(); | |
495 | /* NOTREACHED */ | |
496 | } | |
497 | add_remote_forward(&options, fwd_port, buf, fwd_host_port); | |
498 | break; | |
5260325f | 499 | case 'L': |
48e671d5 | 500 | if (sscanf(optarg, "%hu/%255[^/]/%hu", &fwd_port, buf, |
501 | &fwd_host_port) != 3 && | |
502 | sscanf(optarg, "%hu:%255[^:]:%hu", &fwd_port, buf, | |
503 | &fwd_host_port) != 3) { | |
5260325f | 504 | fprintf(stderr, "Bad forwarding specification '%s'.\n", optarg); |
505 | usage(); | |
506 | /* NOTREACHED */ | |
507 | } | |
508 | add_local_forward(&options, fwd_port, buf, fwd_host_port); | |
509 | break; | |
0490e609 | 510 | |
511 | case 'D': | |
2d2a2c65 | 512 | fwd_port = a2port(optarg); |
513 | if (fwd_port == 0) { | |
514 | fprintf(stderr, "Bad dynamic port '%s'\n", optarg); | |
6031af8d | 515 | exit(1); |
516 | } | |
0490e609 | 517 | add_local_forward(&options, fwd_port, "socks4", 0); |
518 | break; | |
519 | ||
5260325f | 520 | case 'C': |
521 | options.compression = 1; | |
522 | break; | |
8ce64345 | 523 | case 'N': |
524 | no_shell_flag = 1; | |
525 | no_tty_flag = 1; | |
526 | break; | |
8ce64345 | 527 | case 'T': |
528 | no_tty_flag = 1; | |
529 | break; | |
5260325f | 530 | case 'o': |
531 | dummy = 1; | |
532 | if (process_config_line(&options, host ? host : "", optarg, | |
533 | "command-line", 0, &dummy) != 0) | |
534 | exit(1); | |
535 | break; | |
ae810de7 | 536 | case 's': |
537 | subsystem_flag = 1; | |
538 | break; | |
3435f5a6 | 539 | case 'b': |
540 | options.bind_address = optarg; | |
541 | break; | |
5260325f | 542 | default: |
543 | usage(); | |
544 | } | |
545 | } | |
546 | ||
547 | /* Check that we got a host name. */ | |
548 | if (!host) | |
8efc0c15 | 549 | usage(); |
5260325f | 550 | |
22d89d24 | 551 | SSLeay_add_all_algorithms(); |
fa08c86b | 552 | ERR_load_crypto_strings(); |
22d89d24 | 553 | |
5260325f | 554 | /* Initialize the command to execute on remote host. */ |
555 | buffer_init(&command); | |
556 | ||
aa3378df | 557 | /* |
558 | * Save the command to execute on the remote host in a buffer. There | |
559 | * is no limit on the length of the command, except by the maximum | |
560 | * packet size. Also sets the tty flag if there is no command. | |
561 | */ | |
5260325f | 562 | if (optind == ac) { |
563 | /* No command specified - execute shell on a tty. */ | |
564 | tty_flag = 1; | |
ae810de7 | 565 | if (subsystem_flag) { |
57aa8961 | 566 | fprintf(stderr, "You must specify a subsystem to invoke.\n"); |
ae810de7 | 567 | usage(); |
568 | } | |
5260325f | 569 | } else { |
570 | /* A command has been specified. Store it into the | |
571 | buffer. */ | |
572 | for (i = optind; i < ac; i++) { | |
573 | if (i > optind) | |
574 | buffer_append(&command, " ", 1); | |
575 | buffer_append(&command, av[i], strlen(av[i])); | |
576 | } | |
8efc0c15 | 577 | } |
5260325f | 578 | |
579 | /* Cannot fork to background if no command. */ | |
14a9a859 | 580 | if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag) |
5260325f | 581 | fatal("Cannot fork into background without a command to execute."); |
582 | ||
583 | /* Allocate a tty by default if no command specified. */ | |
584 | if (buffer_len(&command) == 0) | |
585 | tty_flag = 1; | |
586 | ||
0b6fbf03 | 587 | /* Force no tty*/ |
588 | if (no_tty_flag) | |
589 | tty_flag = 0; | |
5260325f | 590 | /* Do not allocate a tty if stdin is not a tty. */ |
8abcdba4 | 591 | if (!isatty(fileno(stdin)) && !force_tty_flag) { |
5260325f | 592 | if (tty_flag) |
54b974dc | 593 | log("Pseudo-terminal will not be allocated because stdin is not a terminal."); |
5260325f | 594 | tty_flag = 0; |
595 | } | |
8ce64345 | 596 | |
20244695 | 597 | /* |
598 | * Initialize "log" output. Since we are the client all output | |
599 | * actually goes to stderr. | |
600 | */ | |
cc44f691 | 601 | log_init(av[0], options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level, |
602 | SYSLOG_FACILITY_USER, 1); | |
5260325f | 603 | |
604 | /* Read per-user configuration file. */ | |
42f11eb2 | 605 | snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, _PATH_SSH_USER_CONFFILE); |
5260325f | 606 | read_config_file(buf, host, &options); |
607 | ||
608 | /* Read systemwide configuration file. */ | |
42f11eb2 | 609 | read_config_file(_PATH_HOST_CONFIG_FILE, host, &options); |
5260325f | 610 | |
611 | /* Fill configuration defaults. */ | |
612 | fill_default_options(&options); | |
613 | ||
614 | /* reinit */ | |
20244695 | 615 | log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 1); |
5260325f | 616 | |
e339aa53 | 617 | seed_rng(); |
618 | ||
5260325f | 619 | if (options.user == NULL) |
620 | options.user = xstrdup(pw->pw_name); | |
621 | ||
622 | if (options.hostname != NULL) | |
623 | host = options.hostname; | |
624 | ||
5260325f | 625 | /* Disable rhosts authentication if not running as root. */ |
3c62e7eb | 626 | #ifdef HAVE_CYGWIN |
627 | /* Ignore uid if running under Windows */ | |
628 | if (!options.use_privileged_port) { | |
629 | #else | |
5260325f | 630 | if (original_effective_uid != 0 || !options.use_privileged_port) { |
3c62e7eb | 631 | #endif |
6ffc9c88 | 632 | debug("Rhosts Authentication disabled, " |
633 | "originating port will not be trusted."); | |
5260325f | 634 | options.rhosts_authentication = 0; |
5260325f | 635 | } |
aa3378df | 636 | /* |
637 | * If using rsh has been selected, exec it now (without trying | |
638 | * anything else). Note that we must release privileges first. | |
639 | */ | |
5260325f | 640 | if (options.use_rsh) { |
aa3378df | 641 | /* |
642 | * Restore our superuser privileges. This must be done | |
643 | * before permanently setting the uid. | |
644 | */ | |
5260325f | 645 | restore_uid(); |
646 | ||
647 | /* Switch to the original uid permanently. */ | |
63bd8c36 | 648 | permanently_set_uid(pw); |
5260325f | 649 | |
650 | /* Execute rsh. */ | |
651 | rsh_connect(host, options.user, &command); | |
652 | fatal("rsh_connect returned"); | |
8efc0c15 | 653 | } |
5260325f | 654 | /* Restore our superuser privileges. */ |
655 | restore_uid(); | |
656 | ||
6ffc9c88 | 657 | /* Open a connection to the remote host. */ |
5260325f | 658 | |
659 | ok = ssh_connect(host, &hostaddr, options.port, | |
6ffc9c88 | 660 | options.connection_attempts, |
661 | original_effective_uid != 0 || !options.use_privileged_port, | |
63bd8c36 | 662 | pw, options.proxy_command); |
5260325f | 663 | |
aa3378df | 664 | /* |
665 | * If we successfully made the connection, load the host private key | |
666 | * in case we will need it later for combined rsa-rhosts | |
667 | * authentication. This must be done before releasing extra | |
668 | * privileges, because the file is only readable by root. | |
669 | */ | |
8002af61 | 670 | sensitive_data.nkeys = 0; |
671 | sensitive_data.keys = NULL; | |
672 | if (ok && (options.rhosts_rsa_authentication || | |
673 | options.hostbased_authentication)) { | |
674 | sensitive_data.nkeys = 3; | |
675 | sensitive_data.keys = xmalloc(sensitive_data.nkeys*sizeof(Key)); | |
676 | sensitive_data.keys[0] = key_load_private_type(KEY_RSA1, | |
aeaa3d9e | 677 | _PATH_HOST_KEY_FILE, "", NULL); |
8002af61 | 678 | sensitive_data.keys[1] = key_load_private_type(KEY_DSA, |
679 | _PATH_HOST_DSA_KEY_FILE, "", NULL); | |
680 | sensitive_data.keys[2] = key_load_private_type(KEY_RSA, | |
681 | _PATH_HOST_RSA_KEY_FILE, "", NULL); | |
5260325f | 682 | } |
aa3378df | 683 | /* |
684 | * Get rid of any extra privileges that we may have. We will no | |
685 | * longer need them. Also, extra privileges could make it very hard | |
686 | * to read identity files and other non-world-readable files from the | |
687 | * user's home directory if it happens to be on a NFS volume where | |
688 | * root is mapped to nobody. | |
689 | */ | |
690 | ||
691 | /* | |
692 | * Note that some legacy systems need to postpone the following call | |
693 | * to permanently_set_uid() until the private hostkey is destroyed | |
694 | * with RSA_free(). Otherwise the calling user could ptrace() the | |
695 | * process, read the private hostkey and impersonate the host. | |
696 | * OpenBSD does not allow ptracing of setuid processes. | |
697 | */ | |
63bd8c36 | 698 | permanently_set_uid(pw); |
5260325f | 699 | |
aa3378df | 700 | /* |
701 | * Now that we are back to our own permissions, create ~/.ssh | |
702 | * directory if it doesn\'t already exist. | |
703 | */ | |
42f11eb2 | 704 | snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, _PATH_SSH_USER_DIR); |
5260325f | 705 | if (stat(buf, &st) < 0) |
704b1659 | 706 | if (mkdir(buf, 0700) < 0) |
5260325f | 707 | error("Could not create directory '%.200s'.", buf); |
708 | ||
709 | /* Check if the connection failed, and try "rsh" if appropriate. */ | |
710 | if (!ok) { | |
711 | if (options.port != 0) | |
57112b5a | 712 | log("Secure connection to %.100s on port %hu refused%.100s.", |
5260325f | 713 | host, options.port, |
714 | options.fallback_to_rsh ? "; reverting to insecure method" : ""); | |
715 | else | |
716 | log("Secure connection to %.100s refused%.100s.", host, | |
717 | options.fallback_to_rsh ? "; reverting to insecure method" : ""); | |
718 | ||
719 | if (options.fallback_to_rsh) { | |
720 | rsh_connect(host, options.user, &command); | |
721 | fatal("rsh_connect returned"); | |
722 | } | |
723 | exit(1); | |
8efc0c15 | 724 | } |
fee56204 | 725 | /* load options.identity_files */ |
726 | load_public_identity_files(); | |
727 | ||
728 | /* Expand ~ in known host file names. */ | |
729 | /* XXX mem-leaks: */ | |
fa08c86b | 730 | options.system_hostfile = |
731 | tilde_expand_filename(options.system_hostfile, original_real_uid); | |
732 | options.user_hostfile = | |
733 | tilde_expand_filename(options.user_hostfile, original_real_uid); | |
734 | options.system_hostfile2 = | |
735 | tilde_expand_filename(options.system_hostfile2, original_real_uid); | |
736 | options.user_hostfile2 = | |
737 | tilde_expand_filename(options.user_hostfile2, original_real_uid); | |
5260325f | 738 | |
739 | /* Log into the remote system. This never returns if the login fails. */ | |
8002af61 | 740 | ssh_login(sensitive_data.keys, sensitive_data.nkeys, |
741 | host, (struct sockaddr *)&hostaddr, pw); | |
742 | ||
743 | /* We no longer need the private host keys. Clear them now. */ | |
744 | if (sensitive_data.nkeys != 0) { | |
745 | for (i = 0; i < sensitive_data.nkeys; i++) { | |
746 | if (sensitive_data.keys[i] != NULL) { | |
747 | /* Destroys contents safely */ | |
748 | debug3("clear hostkey %d", i); | |
749 | key_free(sensitive_data.keys[i]); | |
750 | sensitive_data.keys[i] = NULL; | |
751 | } | |
752 | } | |
753 | xfree(sensitive_data.keys); | |
754 | } | |
5260325f | 755 | |
8ce64345 | 756 | exit_status = compat20 ? ssh_session2() : ssh_session(); |
757 | packet_close(); | |
758 | return exit_status; | |
759 | } | |
760 | ||
396c147e | 761 | static void |
0b242b12 | 762 | x11_get_proto(char *proto, int proto_len, char *data, int data_len) |
763 | { | |
764 | char line[512]; | |
765 | FILE *f; | |
766 | int got_data = 0, i; | |
767 | ||
fa649821 | 768 | if (options.xauth_location) { |
769 | /* Try to get Xauthority information for the display. */ | |
5ca51e19 | 770 | snprintf(line, sizeof line, "%.100s list %.200s 2>" _PATH_DEVNULL, |
fa649821 | 771 | options.xauth_location, getenv("DISPLAY")); |
772 | f = popen(line, "r"); | |
773 | if (f && fgets(line, sizeof(line), f) && | |
774 | sscanf(line, "%*s %s %s", proto, data) == 2) | |
775 | got_data = 1; | |
776 | if (f) | |
777 | pclose(f); | |
778 | } | |
0b242b12 | 779 | /* |
780 | * If we didn't get authentication data, just make up some | |
781 | * data. The forwarding code will check the validity of the | |
782 | * response anyway, and substitute this data. The X11 | |
783 | * server, however, will ignore this fake data and use | |
784 | * whatever authentication mechanisms it was using otherwise | |
785 | * for the local connection. | |
786 | */ | |
787 | if (!got_data) { | |
788 | u_int32_t rand = 0; | |
789 | ||
790 | strlcpy(proto, "MIT-MAGIC-COOKIE-1", proto_len); | |
791 | for (i = 0; i < 16; i++) { | |
792 | if (i % 4 == 0) | |
793 | rand = arc4random(); | |
794 | snprintf(data + 2 * i, data_len - 2 * i, "%02x", rand & 0xff); | |
795 | rand >>= 8; | |
796 | } | |
797 | } | |
798 | } | |
799 | ||
396c147e | 800 | static void |
fa08c86b | 801 | ssh_init_forwarding(void) |
802 | { | |
02a024dd | 803 | int success = 0; |
fa08c86b | 804 | int i; |
02a024dd | 805 | |
fa08c86b | 806 | /* Initiate local TCP/IP port forwardings. */ |
807 | for (i = 0; i < options.num_local_forwards; i++) { | |
808 | debug("Connections to local port %d forwarded to remote address %.200s:%d", | |
809 | options.local_forwards[i].port, | |
810 | options.local_forwards[i].host, | |
811 | options.local_forwards[i].host_port); | |
02a024dd | 812 | success += channel_request_local_forwarding( |
fa08c86b | 813 | options.local_forwards[i].port, |
814 | options.local_forwards[i].host, | |
815 | options.local_forwards[i].host_port, | |
816 | options.gateway_ports); | |
817 | } | |
02a024dd | 818 | if (i > 0 && success == 0) |
819 | error("Could not request local forwarding."); | |
fa08c86b | 820 | |
821 | /* Initiate remote TCP/IP port forwardings. */ | |
822 | for (i = 0; i < options.num_remote_forwards; i++) { | |
823 | debug("Connections to remote port %d forwarded to local address %.200s:%d", | |
824 | options.remote_forwards[i].port, | |
825 | options.remote_forwards[i].host, | |
826 | options.remote_forwards[i].host_port); | |
827 | channel_request_remote_forwarding( | |
828 | options.remote_forwards[i].port, | |
829 | options.remote_forwards[i].host, | |
830 | options.remote_forwards[i].host_port); | |
831 | } | |
832 | } | |
833 | ||
396c147e | 834 | static void |
fa08c86b | 835 | check_agent_present(void) |
836 | { | |
837 | if (options.forward_agent) { | |
838 | /* Clear agent forwarding if we don\'t have an agent. */ | |
839 | int authfd = ssh_get_authentication_socket(); | |
840 | if (authfd < 0) | |
841 | options.forward_agent = 0; | |
842 | else | |
843 | ssh_close_authentication_socket(authfd); | |
844 | } | |
845 | } | |
846 | ||
396c147e | 847 | static int |
8ce64345 | 848 | ssh_session(void) |
849 | { | |
850 | int type; | |
8ce64345 | 851 | int plen; |
852 | int interactive = 0; | |
853 | int have_tty = 0; | |
854 | struct winsize ws; | |
8ce64345 | 855 | char *cp; |
856 | ||
5260325f | 857 | /* Enable compression if requested. */ |
858 | if (options.compression) { | |
859 | debug("Requesting compression at level %d.", options.compression_level); | |
860 | ||
861 | if (options.compression_level < 1 || options.compression_level > 9) | |
862 | fatal("Compression level must be from 1 (fast) to 9 (slow, best)."); | |
863 | ||
864 | /* Send the request. */ | |
865 | packet_start(SSH_CMSG_REQUEST_COMPRESSION); | |
866 | packet_put_int(options.compression_level); | |
867 | packet_send(); | |
868 | packet_write_wait(); | |
869 | type = packet_read(&plen); | |
870 | if (type == SSH_SMSG_SUCCESS) | |
871 | packet_start_compression(options.compression_level); | |
872 | else if (type == SSH_SMSG_FAILURE) | |
873 | log("Warning: Remote host refused compression."); | |
874 | else | |
875 | packet_disconnect("Protocol error waiting for compression response."); | |
876 | } | |
877 | /* Allocate a pseudo tty if appropriate. */ | |
878 | if (tty_flag) { | |
879 | debug("Requesting pty."); | |
880 | ||
881 | /* Start the packet. */ | |
882 | packet_start(SSH_CMSG_REQUEST_PTY); | |
883 | ||
884 | /* Store TERM in the packet. There is no limit on the | |
885 | length of the string. */ | |
886 | cp = getenv("TERM"); | |
887 | if (!cp) | |
888 | cp = ""; | |
449c5ba5 | 889 | packet_put_cstring(cp); |
5260325f | 890 | |
891 | /* Store window size in the packet. */ | |
892 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) | |
893 | memset(&ws, 0, sizeof(ws)); | |
894 | packet_put_int(ws.ws_row); | |
895 | packet_put_int(ws.ws_col); | |
896 | packet_put_int(ws.ws_xpixel); | |
897 | packet_put_int(ws.ws_ypixel); | |
898 | ||
899 | /* Store tty modes in the packet. */ | |
30dcc918 | 900 | tty_make_modes(fileno(stdin), NULL); |
5260325f | 901 | |
902 | /* Send the packet, and wait for it to leave. */ | |
903 | packet_send(); | |
904 | packet_write_wait(); | |
905 | ||
906 | /* Read response from the server. */ | |
907 | type = packet_read(&plen); | |
4fe2af09 | 908 | if (type == SSH_SMSG_SUCCESS) { |
5260325f | 909 | interactive = 1; |
8ce64345 | 910 | have_tty = 1; |
4fe2af09 | 911 | } else if (type == SSH_SMSG_FAILURE) |
5260325f | 912 | log("Warning: Remote host failed or refused to allocate a pseudo tty."); |
913 | else | |
914 | packet_disconnect("Protocol error waiting for pty request response."); | |
915 | } | |
916 | /* Request X11 forwarding if enabled and DISPLAY is set. */ | |
917 | if (options.forward_x11 && getenv("DISPLAY") != NULL) { | |
0b242b12 | 918 | char proto[512], data[512]; |
919 | /* Get reasonable local authentication information. */ | |
920 | x11_get_proto(proto, sizeof proto, data, sizeof data); | |
921 | /* Request forwarding with authentication spoofing. */ | |
5260325f | 922 | debug("Requesting X11 forwarding with authentication spoofing."); |
0b242b12 | 923 | x11_request_forwarding_with_spoofing(0, proto, data); |
5260325f | 924 | |
925 | /* Read response from the server. */ | |
926 | type = packet_read(&plen); | |
927 | if (type == SSH_SMSG_SUCCESS) { | |
5260325f | 928 | interactive = 1; |
0b242b12 | 929 | } else if (type == SSH_SMSG_FAILURE) { |
5260325f | 930 | log("Warning: Remote host denied X11 forwarding."); |
0b242b12 | 931 | } else { |
5260325f | 932 | packet_disconnect("Protocol error waiting for X11 forwarding"); |
0b242b12 | 933 | } |
5260325f | 934 | } |
935 | /* Tell the packet module whether this is an interactive session. */ | |
b5c334cc | 936 | packet_set_interactive(interactive); |
5260325f | 937 | |
938 | /* Request authentication agent forwarding if appropriate. */ | |
fa08c86b | 939 | check_agent_present(); |
940 | ||
5260325f | 941 | if (options.forward_agent) { |
942 | debug("Requesting authentication agent forwarding."); | |
943 | auth_request_forwarding(); | |
944 | ||
945 | /* Read response from the server. */ | |
946 | type = packet_read(&plen); | |
947 | packet_integrity_check(plen, 0, type); | |
948 | if (type != SSH_SMSG_SUCCESS) | |
949 | log("Warning: Remote host denied authentication agent forwarding."); | |
950 | } | |
8efc0c15 | 951 | |
fa08c86b | 952 | /* Initiate port forwardings. */ |
953 | ssh_init_forwarding(); | |
5260325f | 954 | |
aa3378df | 955 | /* If requested, let ssh continue in the background. */ |
6ae2364d | 956 | if (fork_after_authentication_flag) |
aa3378df | 957 | if (daemon(1, 1) < 0) |
958 | fatal("daemon() failed: %.200s", strerror(errno)); | |
959 | ||
960 | /* | |
961 | * If a command was specified on the command line, execute the | |
962 | * command now. Otherwise request the server to start a shell. | |
963 | */ | |
5260325f | 964 | if (buffer_len(&command) > 0) { |
965 | int len = buffer_len(&command); | |
966 | if (len > 900) | |
967 | len = 900; | |
968 | debug("Sending command: %.*s", len, buffer_ptr(&command)); | |
969 | packet_start(SSH_CMSG_EXEC_CMD); | |
970 | packet_put_string(buffer_ptr(&command), buffer_len(&command)); | |
971 | packet_send(); | |
972 | packet_write_wait(); | |
973 | } else { | |
974 | debug("Requesting shell."); | |
975 | packet_start(SSH_CMSG_EXEC_SHELL); | |
976 | packet_send(); | |
977 | packet_write_wait(); | |
978 | } | |
979 | ||
980 | /* Enter the interactive session. */ | |
4bf9c10e | 981 | return client_loop(have_tty, tty_flag ? |
982 | options.escape_char : SSH_ESCAPECHAR_NONE, 0); | |
8ce64345 | 983 | } |
5260325f | 984 | |
396c147e | 985 | static void |
1f3bf5aa | 986 | client_subsystem_reply(int type, int plen, void *ctxt) |
987 | { | |
988 | int id, len; | |
989 | ||
990 | id = packet_get_int(); | |
991 | len = buffer_len(&command); | |
ce91d6f8 | 992 | if (len > 900) |
993 | len = 900; | |
1f3bf5aa | 994 | packet_done(); |
995 | if (type == SSH2_MSG_CHANNEL_FAILURE) | |
996 | fatal("Request for subsystem '%.*s' failed on channel %d", | |
997 | len, buffer_ptr(&command), id); | |
998 | } | |
999 | ||
396c147e | 1000 | static void |
fa08c86b | 1001 | ssh_session2_callback(int id, void *arg) |
8ce64345 | 1002 | { |
1003 | int len; | |
b5c334cc | 1004 | int interactive = 0; |
30dcc918 | 1005 | struct termios tio; |
b5c334cc | 1006 | |
6a416424 | 1007 | debug("client_init id %d arg %ld", id, (long)arg); |
8ce64345 | 1008 | |
8ce64345 | 1009 | if (tty_flag) { |
1010 | struct winsize ws; | |
1011 | char *cp; | |
1012 | cp = getenv("TERM"); | |
1013 | if (!cp) | |
1014 | cp = ""; | |
1015 | /* Store window size in the packet. */ | |
1016 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) | |
1017 | memset(&ws, 0, sizeof(ws)); | |
1018 | ||
1019 | channel_request_start(id, "pty-req", 0); | |
1020 | packet_put_cstring(cp); | |
1021 | packet_put_int(ws.ws_col); | |
1022 | packet_put_int(ws.ws_row); | |
1023 | packet_put_int(ws.ws_xpixel); | |
1024 | packet_put_int(ws.ws_ypixel); | |
30dcc918 | 1025 | tio = get_saved_tio(); |
1026 | tty_make_modes(/*ignored*/ 0, &tio); | |
8ce64345 | 1027 | packet_send(); |
b5c334cc | 1028 | interactive = 1; |
8ce64345 | 1029 | /* XXX wait for reply */ |
1030 | } | |
0b242b12 | 1031 | if (options.forward_x11 && |
1032 | getenv("DISPLAY") != NULL) { | |
1033 | char proto[512], data[512]; | |
1034 | /* Get reasonable local authentication information. */ | |
1035 | x11_get_proto(proto, sizeof proto, data, sizeof data); | |
1036 | /* Request forwarding with authentication spoofing. */ | |
1037 | debug("Requesting X11 forwarding with authentication spoofing."); | |
1038 | x11_request_forwarding_with_spoofing(id, proto, data); | |
b5c334cc | 1039 | interactive = 1; |
0b242b12 | 1040 | /* XXX wait for reply */ |
1041 | } | |
1042 | ||
fa08c86b | 1043 | check_agent_present(); |
1044 | if (options.forward_agent) { | |
1045 | debug("Requesting authentication agent forwarding."); | |
1046 | channel_request_start(id, "auth-agent-req@openssh.com", 0); | |
1047 | packet_send(); | |
1048 | } | |
1049 | ||
8ce64345 | 1050 | len = buffer_len(&command); |
1051 | if (len > 0) { | |
1052 | if (len > 900) | |
1053 | len = 900; | |
ae810de7 | 1054 | if (subsystem_flag) { |
1055 | debug("Sending subsystem: %.*s", len, buffer_ptr(&command)); | |
1f3bf5aa | 1056 | channel_request_start(id, "subsystem", /*want reply*/ 1); |
1057 | /* register callback for reply */ | |
1058 | /* XXX we asume that client_loop has already been called */ | |
1059 | dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &client_subsystem_reply); | |
1060 | dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &client_subsystem_reply); | |
ae810de7 | 1061 | } else { |
1062 | debug("Sending command: %.*s", len, buffer_ptr(&command)); | |
1063 | channel_request_start(id, "exec", 0); | |
1064 | } | |
ce91d6f8 | 1065 | packet_put_string(buffer_ptr(&command), buffer_len(&command)); |
8ce64345 | 1066 | packet_send(); |
1067 | } else { | |
1068 | channel_request(id, "shell", 0); | |
1069 | } | |
1070 | /* channel_callback(id, SSH2_MSG_OPEN_CONFIGMATION, client_init, 0); */ | |
1f3bf5aa | 1071 | |
8ce64345 | 1072 | /* register different callback, etc. XXX */ |
b5c334cc | 1073 | packet_set_interactive(interactive); |
8ce64345 | 1074 | } |
1075 | ||
396c147e | 1076 | static int |
eb0dd41f | 1077 | ssh_session2_command(void) |
8ce64345 | 1078 | { |
719fc62f | 1079 | Channel *c; |
1080 | int window, packetmax, in, out, err; | |
2e73a022 | 1081 | |
14a9a859 | 1082 | if (stdin_null_flag) { |
5ca51e19 | 1083 | in = open(_PATH_DEVNULL, O_RDONLY); |
14a9a859 | 1084 | } else { |
1085 | in = dup(STDIN_FILENO); | |
1086 | } | |
2e73a022 | 1087 | out = dup(STDOUT_FILENO); |
1088 | err = dup(STDERR_FILENO); | |
8ce64345 | 1089 | |
1090 | if (in < 0 || out < 0 || err < 0) | |
14a9a859 | 1091 | fatal("dup() in/out/err failed"); |
8ce64345 | 1092 | |
a22aff1f | 1093 | /* enable nonblocking unless tty */ |
1094 | if (!isatty(in)) | |
1095 | set_nonblock(in); | |
1096 | if (!isatty(out)) | |
1097 | set_nonblock(out); | |
1098 | if (!isatty(err)) | |
1099 | set_nonblock(err); | |
1100 | ||
bcbf86ec | 1101 | window = CHAN_SES_WINDOW_DEFAULT; |
1102 | packetmax = CHAN_SES_PACKET_DEFAULT; | |
1103 | if (!tty_flag) { | |
8ce64345 | 1104 | window *= 2; |
bcbf86ec | 1105 | packetmax *=2; |
8ce64345 | 1106 | } |
719fc62f | 1107 | c = channel_new( |
8ce64345 | 1108 | "session", SSH_CHANNEL_OPENING, in, out, err, |
bcbf86ec | 1109 | window, packetmax, CHAN_EXTENDED_WRITE, |
a22aff1f | 1110 | xstrdup("client-session"), /*nonblock*/0); |
719fc62f | 1111 | if (c == NULL) |
1112 | fatal("ssh_session2_command: channel_new failed"); | |
8ce64345 | 1113 | |
719fc62f | 1114 | debug3("ssh_session2_command: channel_new: %d", c->self); |
eb0dd41f | 1115 | |
36e1f6a1 | 1116 | channel_send_open(c->self); |
719fc62f | 1117 | channel_register_callback(c->self, SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, |
fa08c86b | 1118 | ssh_session2_callback, (void *)0); |
5260325f | 1119 | |
719fc62f | 1120 | return c->self; |
eb0dd41f | 1121 | } |
1122 | ||
396c147e | 1123 | static int |
eb0dd41f | 1124 | ssh_session2(void) |
1125 | { | |
1126 | int id; | |
1127 | ||
1128 | /* XXX should be pre-session */ | |
1129 | ssh_init_forwarding(); | |
1130 | ||
1131 | id = no_shell_flag ? -1 : ssh_session2_command(); | |
1132 | ||
1133 | /* If requested, let ssh continue in the background. */ | |
1134 | if (fork_after_authentication_flag) | |
1135 | if (daemon(1, 1) < 0) | |
1136 | fatal("daemon() failed: %.200s", strerror(errno)); | |
1137 | ||
4bf9c10e | 1138 | return client_loop(tty_flag, tty_flag ? |
1139 | options.escape_char : SSH_ESCAPECHAR_NONE, id); | |
8efc0c15 | 1140 | } |
fa08c86b | 1141 | |
396c147e | 1142 | static void |
fee56204 | 1143 | load_public_identity_files(void) |
1144 | { | |
1145 | char *filename; | |
1146 | Key *public; | |
1147 | int i; | |
1148 | ||
1149 | for (i = 0; i < options.num_identity_files; i++) { | |
1150 | filename = tilde_expand_filename(options.identity_files[i], | |
1151 | original_real_uid); | |
aeaa3d9e | 1152 | public = key_load_public(filename, NULL); |
fee56204 | 1153 | debug("identity file %s type %d", filename, |
1154 | public ? public->type : -1); | |
1155 | xfree(options.identity_files[i]); | |
1156 | options.identity_files[i] = filename; | |
1157 | options.identity_keys[i] = public; | |
1158 | } | |
383546c4 | 1159 | #ifdef SMARTCARD |
1160 | if (sc_reader_num != -1 && | |
1161 | options.num_identity_files + 1 < SSH_MAX_IDENTITY_FILES && | |
1162 | (public = sc_get_key(sc_reader_num)) != NULL ) { | |
1163 | Key *new; | |
1164 | ||
1165 | /* XXX ssh1 vs ssh2 */ | |
1166 | new = key_new(KEY_RSA); | |
1167 | new->flags = KEY_FLAG_EXT; | |
1168 | BN_copy(new->rsa->n, public->rsa->n); | |
1169 | BN_copy(new->rsa->e, public->rsa->e); | |
1170 | RSA_set_method(new->rsa, sc_get_engine()); | |
1171 | i = options.num_identity_files++; | |
1172 | options.identity_keys[i] = new; | |
1173 | options.identity_files[i] = xstrdup("smartcard rsa key");; | |
1174 | ||
1175 | new = key_new(KEY_RSA1); | |
1176 | new->flags = KEY_FLAG_EXT; | |
1177 | BN_copy(new->rsa->n, public->rsa->n); | |
1178 | BN_copy(new->rsa->e, public->rsa->e); | |
1179 | RSA_set_method(new->rsa, sc_get_engine()); | |
1180 | i = options.num_identity_files++; | |
1181 | options.identity_keys[i] = new; | |
1182 | options.identity_files[i] = xstrdup("smartcard rsa1 key");; | |
1183 | ||
1184 | key_free(public); | |
1185 | } | |
1186 | #endif | |
fee56204 | 1187 | } |