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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" | |
396c147e | 42 | RCSID("$OpenBSD: ssh.c,v 1.126 2001/06/23 15:12:21 itojun 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 | |
f601d847 | 72 | #ifdef HAVE___PROGNAME |
73 | extern char *__progname; | |
260d427b | 74 | #else |
75 | char *__progname; | |
76 | #endif | |
f601d847 | 77 | |
48e671d5 | 78 | /* Flag indicating whether IPv4 or IPv6. This can be set on the command line. |
79 | Default value is AF_UNSPEC means both IPv4 and IPv6. */ | |
59e76f33 | 80 | #ifdef IPV4_DEFAULT |
81 | int IPv4or6 = AF_INET; | |
82 | #else | |
48e671d5 | 83 | int IPv4or6 = AF_UNSPEC; |
59e76f33 | 84 | #endif |
48e671d5 | 85 | |
5260325f | 86 | /* Flag indicating whether debug mode is on. This can be set on the command line. */ |
8efc0c15 | 87 | int debug_flag = 0; |
88 | ||
a8be9f80 | 89 | /* Flag indicating whether a tty should be allocated */ |
8efc0c15 | 90 | int tty_flag = 0; |
8abcdba4 | 91 | int no_tty_flag = 0; |
92 | int force_tty_flag = 0; | |
8efc0c15 | 93 | |
8ce64345 | 94 | /* don't exec a shell */ |
95 | int no_shell_flag = 0; | |
8ce64345 | 96 | |
aa3378df | 97 | /* |
98 | * Flag indicating that nothing should be read from stdin. This can be set | |
99 | * on the command line. | |
100 | */ | |
8efc0c15 | 101 | int stdin_null_flag = 0; |
102 | ||
aa3378df | 103 | /* |
104 | * Flag indicating that ssh should fork after authentication. This is useful | |
105 | * so that the pasphrase can be entered manually, and then ssh goes to the | |
106 | * background. | |
107 | */ | |
8efc0c15 | 108 | int fork_after_authentication_flag = 0; |
109 | ||
aa3378df | 110 | /* |
111 | * General data structure for command line options and options configurable | |
112 | * in configuration files. See readconf.h. | |
113 | */ | |
8efc0c15 | 114 | Options options; |
115 | ||
aa3378df | 116 | /* |
117 | * Name of the host we are connecting to. This is the name given on the | |
118 | * command line, or the HostName specified for the user-supplied name in a | |
119 | * configuration file. | |
120 | */ | |
8efc0c15 | 121 | char *host; |
122 | ||
123 | /* socket address the host resolves to */ | |
48e671d5 | 124 | struct sockaddr_storage hostaddr; |
8efc0c15 | 125 | |
aa3378df | 126 | /* |
127 | * Flag to indicate that we have received a window change signal which has | |
128 | * not yet been processed. This will cause a message indicating the new | |
129 | * window size to be sent to the server a little later. This is volatile | |
130 | * because this is updated in a signal handler. | |
131 | */ | |
8efc0c15 | 132 | volatile int received_window_change_signal = 0; |
133 | ||
8002af61 | 134 | /* Private host keys. */ |
135 | struct { | |
136 | Key **keys; | |
137 | int nkeys; | |
138 | } sensitive_data; | |
8efc0c15 | 139 | |
140 | /* Original real UID. */ | |
141 | uid_t original_real_uid; | |
142 | ||
8ce64345 | 143 | /* command to be executed */ |
144 | Buffer command; | |
145 | ||
ae810de7 | 146 | /* Should we execute a command or invoke a subsystem? */ |
147 | int subsystem_flag = 0; | |
148 | ||
8efc0c15 | 149 | /* Prints a help message to the user. This function never returns. */ |
150 | ||
396c147e | 151 | static void |
5ca51e19 | 152 | usage(void) |
8efc0c15 | 153 | { |
1fe6a48f | 154 | fprintf(stderr, "Usage: %s [options] host [command]\n", __progname); |
5260325f | 155 | fprintf(stderr, "Options:\n"); |
156 | fprintf(stderr, " -l user Log in using this user name.\n"); | |
5ca51e19 | 157 | fprintf(stderr, " -n Redirect input from " _PATH_DEVNULL ".\n"); |
71276795 | 158 | fprintf(stderr, " -A Enable authentication agent forwarding.\n"); |
63cd7dd0 | 159 | fprintf(stderr, " -a Disable authentication agent forwarding (default).\n"); |
8efc0c15 | 160 | #ifdef AFS |
5260325f | 161 | fprintf(stderr, " -k Disable Kerberos ticket and AFS token forwarding.\n"); |
162 | #endif /* AFS */ | |
2b87da3b | 163 | fprintf(stderr, " -X Enable X11 connection forwarding.\n"); |
63cd7dd0 | 164 | fprintf(stderr, " -x Disable X11 connection forwarding (default).\n"); |
a01a5f30 | 165 | fprintf(stderr, " -i file Identity for public key authentication " |
166 | "(default: ~/.ssh/identity)\n"); | |
5260325f | 167 | fprintf(stderr, " -t Tty; allocate a tty even if command is given.\n"); |
8ce64345 | 168 | fprintf(stderr, " -T Do not allocate a tty.\n"); |
5260325f | 169 | fprintf(stderr, " -v Verbose; display verbose debugging messages.\n"); |
bcbf86ec | 170 | fprintf(stderr, " Multiple -v increases verbosity.\n"); |
5260325f | 171 | fprintf(stderr, " -V Display version number only.\n"); |
172 | fprintf(stderr, " -P Don't allocate a privileged port.\n"); | |
173 | fprintf(stderr, " -q Quiet; don't display any warning messages.\n"); | |
174 | fprintf(stderr, " -f Fork into background after authentication.\n"); | |
175 | fprintf(stderr, " -e char Set escape character; ``none'' = disable (default: ~).\n"); | |
176 | ||
63cd7dd0 | 177 | fprintf(stderr, " -c cipher Select encryption algorithm\n"); |
38967add | 178 | fprintf(stderr, " -m macs Specify MAC algorithms for protocol version 2.\n"); |
5260325f | 179 | fprintf(stderr, " -p port Connect to this port. Server must be on the same port.\n"); |
180 | fprintf(stderr, " -L listen-port:host:port Forward local port to remote address\n"); | |
181 | fprintf(stderr, " -R listen-port:host:port Forward remote port to local address\n"); | |
1fe6a48f | 182 | fprintf(stderr, " These cause %s to listen for connections on a port, and\n", __progname); |
5260325f | 183 | fprintf(stderr, " forward them to the other side by connecting to host:port.\n"); |
184 | fprintf(stderr, " -C Enable compression.\n"); | |
8ce64345 | 185 | fprintf(stderr, " -N Do not execute a shell or command.\n"); |
5260325f | 186 | fprintf(stderr, " -g Allow remote hosts to connect to forwarded ports.\n"); |
1f3bf5aa | 187 | fprintf(stderr, " -1 Force protocol version 1.\n"); |
188 | fprintf(stderr, " -2 Force protocol version 2.\n"); | |
48e671d5 | 189 | fprintf(stderr, " -4 Use IPv4 only.\n"); |
190 | fprintf(stderr, " -6 Use IPv6 only.\n"); | |
5260325f | 191 | fprintf(stderr, " -o 'option' Process the option as if it was read from a configuration file.\n"); |
ae810de7 | 192 | fprintf(stderr, " -s Invoke command (mandatory) as SSH2 subsystem.\n"); |
63cd7dd0 | 193 | fprintf(stderr, " -b addr Local IP address.\n"); |
5260325f | 194 | exit(1); |
8efc0c15 | 195 | } |
196 | ||
5260325f | 197 | /* |
198 | * Connects to the given host using rsh (or prints an error message and exits | |
199 | * if rsh is not available). This function never returns. | |
200 | */ | |
396c147e | 201 | static void |
5260325f | 202 | rsh_connect(char *host, char *user, Buffer * command) |
8efc0c15 | 203 | { |
5260325f | 204 | char *args[10]; |
205 | int i; | |
206 | ||
207 | log("Using rsh. WARNING: Connection will not be encrypted."); | |
208 | /* Build argument list for rsh. */ | |
209 | i = 0; | |
210 | args[i++] = _PATH_RSH; | |
211 | /* host may have to come after user on some systems */ | |
212 | args[i++] = host; | |
213 | if (user) { | |
214 | args[i++] = "-l"; | |
215 | args[i++] = user; | |
216 | } | |
217 | if (buffer_len(command) > 0) { | |
218 | buffer_append(command, "\0", 1); | |
219 | args[i++] = buffer_ptr(command); | |
220 | } | |
221 | args[i++] = NULL; | |
222 | if (debug_flag) { | |
223 | for (i = 0; args[i]; i++) { | |
224 | if (i != 0) | |
225 | fprintf(stderr, " "); | |
226 | fprintf(stderr, "%s", args[i]); | |
227 | } | |
228 | fprintf(stderr, "\n"); | |
8efc0c15 | 229 | } |
5260325f | 230 | execv(_PATH_RSH, args); |
231 | perror(_PATH_RSH); | |
232 | exit(1); | |
8efc0c15 | 233 | } |
234 | ||
396c147e | 235 | static int ssh_session(void); |
236 | static int ssh_session2(void); | |
237 | static void load_public_identity_files(void); | |
8ce64345 | 238 | |
5260325f | 239 | /* |
240 | * Main program for the ssh client. | |
241 | */ | |
8efc0c15 | 242 | int |
243 | main(int ac, char **av) | |
244 | { | |
8ce64345 | 245 | int i, opt, optind, exit_status, ok; |
57112b5a | 246 | u_short fwd_port, fwd_host_port; |
2e000c58 | 247 | char *optarg, *p, *cp, buf[256]; |
5260325f | 248 | struct stat st; |
3b1a83df | 249 | struct passwd *pw; |
8ce64345 | 250 | int dummy; |
5260325f | 251 | uid_t original_effective_uid; |
5260325f | 252 | |
260d427b | 253 | __progname = get_progname(av[0]); |
264dce47 | 254 | init_rng(); |
255 | ||
aa3378df | 256 | /* |
257 | * Save the original real uid. It will be needed later (uid-swapping | |
258 | * may clobber the real uid). | |
259 | */ | |
5260325f | 260 | original_real_uid = getuid(); |
261 | original_effective_uid = geteuid(); | |
262 | ||
7322ef0e | 263 | #ifdef HAVE_SETRLIMIT |
5260325f | 264 | /* If we are installed setuid root be careful to not drop core. */ |
265 | if (original_real_uid != original_effective_uid) { | |
266 | struct rlimit rlim; | |
267 | rlim.rlim_cur = rlim.rlim_max = 0; | |
268 | if (setrlimit(RLIMIT_CORE, &rlim) < 0) | |
269 | fatal("setrlimit failed: %.100s", strerror(errno)); | |
8efc0c15 | 270 | } |
3c62e7eb | 271 | #endif |
63bd8c36 | 272 | /* Get user data. */ |
273 | pw = getpwuid(original_real_uid); | |
274 | if (!pw) { | |
275 | log("You don't exist, go away!"); | |
276 | exit(1); | |
277 | } | |
278 | /* Take a copy of the returned structure. */ | |
279 | pw = pwcopy(pw); | |
280 | ||
aa3378df | 281 | /* |
282 | * Use uid-swapping to give up root privileges for the duration of | |
283 | * option processing. We will re-instantiate the rights when we are | |
284 | * ready to create the privileged port, and will permanently drop | |
285 | * them when the port has been created (actually, when the connection | |
286 | * has been made, as we may need to create the port several times). | |
287 | */ | |
63bd8c36 | 288 | temporarily_use_uid(pw); |
5260325f | 289 | |
aa3378df | 290 | /* |
291 | * Set our umask to something reasonable, as some files are created | |
292 | * with the default umask. This will make them world-readable but | |
293 | * writable only by the owner, which is ok for all files for which we | |
294 | * don't set the modes explicitly. | |
295 | */ | |
5260325f | 296 | umask(022); |
297 | ||
5260325f | 298 | /* Initialize option structure to indicate that no values have been set. */ |
299 | initialize_options(&options); | |
300 | ||
301 | /* Parse command-line arguments. */ | |
302 | host = NULL; | |
303 | ||
5260325f | 304 | for (optind = 1; optind < ac; optind++) { |
305 | if (av[optind][0] != '-') { | |
306 | if (host) | |
307 | break; | |
2e000c58 | 308 | if (strchr(av[optind], '@')) { |
309 | p = xstrdup(av[optind]); | |
310 | cp = strchr(p, '@'); | |
311 | if(cp == NULL || cp == p) | |
6ae2364d | 312 | usage(); |
2e000c58 | 313 | options.user = p; |
5260325f | 314 | *cp = '\0'; |
315 | host = ++cp; | |
316 | } else | |
317 | host = av[optind]; | |
318 | continue; | |
319 | } | |
320 | opt = av[optind][1]; | |
321 | if (!opt) | |
322 | usage(); | |
3435f5a6 | 323 | if (strchr("eilcmpbLRDo", opt)) { /* options with arguments */ |
5260325f | 324 | optarg = av[optind] + 2; |
325 | if (strcmp(optarg, "") == 0) { | |
326 | if (optind >= ac - 1) | |
327 | usage(); | |
328 | optarg = av[++optind]; | |
329 | } | |
330 | } else { | |
331 | if (av[optind][2]) | |
332 | usage(); | |
333 | optarg = NULL; | |
334 | } | |
335 | switch (opt) { | |
1f3bf5aa | 336 | case '1': |
337 | options.protocol = SSH_PROTO_1; | |
338 | break; | |
6ae2364d | 339 | case '2': |
340 | options.protocol = SSH_PROTO_2; | |
341 | break; | |
48e671d5 | 342 | case '4': |
343 | IPv4or6 = AF_INET; | |
344 | break; | |
48e671d5 | 345 | case '6': |
346 | IPv4or6 = AF_INET6; | |
347 | break; | |
5260325f | 348 | case 'n': |
349 | stdin_null_flag = 1; | |
350 | break; | |
5260325f | 351 | case 'f': |
352 | fork_after_authentication_flag = 1; | |
353 | stdin_null_flag = 1; | |
354 | break; | |
5260325f | 355 | case 'x': |
356 | options.forward_x11 = 0; | |
357 | break; | |
5260325f | 358 | case 'X': |
359 | options.forward_x11 = 1; | |
360 | break; | |
5260325f | 361 | case 'g': |
362 | options.gateway_ports = 1; | |
363 | break; | |
5260325f | 364 | case 'P': |
365 | options.use_privileged_port = 0; | |
366 | break; | |
5260325f | 367 | case 'a': |
368 | options.forward_agent = 0; | |
369 | break; | |
71276795 | 370 | case 'A': |
371 | options.forward_agent = 1; | |
372 | break; | |
5260325f | 373 | #ifdef AFS |
374 | case 'k': | |
375 | options.kerberos_tgt_passing = 0; | |
376 | options.afs_token_passing = 0; | |
377 | break; | |
378 | #endif | |
379 | case 'i': | |
380 | if (stat(optarg, &st) < 0) { | |
381 | fprintf(stderr, "Warning: Identity file %s does not exist.\n", | |
fa08c86b | 382 | optarg); |
5260325f | 383 | break; |
384 | } | |
385 | if (options.num_identity_files >= SSH_MAX_IDENTITY_FILES) | |
386 | fatal("Too many identity files specified (max %d)", | |
fa08c86b | 387 | SSH_MAX_IDENTITY_FILES); |
388 | options.identity_files[options.num_identity_files++] = xstrdup(optarg); | |
5260325f | 389 | break; |
5260325f | 390 | case 't': |
8abcdba4 | 391 | if (tty_flag) |
392 | force_tty_flag = 1; | |
5260325f | 393 | tty_flag = 1; |
394 | break; | |
5260325f | 395 | case 'v': |
bcbf86ec | 396 | if (0 == debug_flag) { |
397 | debug_flag = 1; | |
398 | options.log_level = SYSLOG_LEVEL_DEBUG1; | |
399 | } else if (options.log_level < SYSLOG_LEVEL_DEBUG3) { | |
400 | options.log_level++; | |
401 | break; | |
402 | } else { | |
54b974dc | 403 | fatal("Too high debugging level."); |
bcbf86ec | 404 | } |
405 | /* fallthrough */ | |
5260325f | 406 | case 'V': |
e68225b2 | 407 | fprintf(stderr, |
408 | "%s, SSH protocols %d.%d/%d.%d, OpenSSL 0x%8.8lx\n", | |
a8be9f80 | 409 | SSH_VERSION, |
410 | PROTOCOL_MAJOR_1, PROTOCOL_MINOR_1, | |
e68225b2 | 411 | PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2, |
412 | SSLeay()); | |
5260325f | 413 | if (opt == 'V') |
414 | exit(0); | |
5260325f | 415 | break; |
5260325f | 416 | case 'q': |
417 | options.log_level = SYSLOG_LEVEL_QUIET; | |
418 | break; | |
5260325f | 419 | case 'e': |
420 | if (optarg[0] == '^' && optarg[2] == 0 && | |
1e3b8b07 | 421 | (u_char) optarg[1] >= 64 && (u_char) optarg[1] < 128) |
422 | options.escape_char = (u_char) optarg[1] & 31; | |
5260325f | 423 | else if (strlen(optarg) == 1) |
1e3b8b07 | 424 | options.escape_char = (u_char) optarg[0]; |
5260325f | 425 | else if (strcmp(optarg, "none") == 0) |
4bf9c10e | 426 | options.escape_char = SSH_ESCAPECHAR_NONE; |
5260325f | 427 | else { |
428 | fprintf(stderr, "Bad escape character '%s'.\n", optarg); | |
429 | exit(1); | |
430 | } | |
431 | break; | |
5260325f | 432 | case 'c': |
a306f2dd | 433 | if (ciphers_valid(optarg)) { |
434 | /* SSH2 only */ | |
435 | options.ciphers = xstrdup(optarg); | |
d0c832f3 | 436 | options.cipher = SSH_CIPHER_ILLEGAL; |
a306f2dd | 437 | } else { |
438 | /* SSH1 only */ | |
c523303b | 439 | options.cipher = cipher_number(optarg); |
440 | if (options.cipher == -1) { | |
a306f2dd | 441 | fprintf(stderr, "Unknown cipher type '%s'\n", optarg); |
442 | exit(1); | |
443 | } | |
c523303b | 444 | if (options.cipher == SSH_CIPHER_3DES) { |
445 | options.ciphers = "3des-cbc"; | |
446 | } else if (options.cipher == SSH_CIPHER_BLOWFISH) { | |
447 | options.ciphers = "blowfish-cbc"; | |
448 | } else { | |
449 | options.ciphers = (char *)-1; | |
450 | } | |
5260325f | 451 | } |
452 | break; | |
b2552997 | 453 | case 'm': |
454 | if (mac_valid(optarg)) | |
455 | options.macs = xstrdup(optarg); | |
456 | else { | |
457 | fprintf(stderr, "Unknown mac type '%s'\n", optarg); | |
458 | exit(1); | |
459 | } | |
460 | break; | |
5260325f | 461 | case 'p': |
2d2a2c65 | 462 | options.port = a2port(optarg); |
463 | if (options.port == 0) { | |
6031af8d | 464 | fprintf(stderr, "Bad port '%s'\n", optarg); |
465 | exit(1); | |
466 | } | |
5260325f | 467 | break; |
5260325f | 468 | case 'l': |
469 | options.user = optarg; | |
470 | break; | |
5260325f | 471 | case 'R': |
48e671d5 | 472 | if (sscanf(optarg, "%hu/%255[^/]/%hu", &fwd_port, buf, |
473 | &fwd_host_port) != 3 && | |
474 | sscanf(optarg, "%hu:%255[^:]:%hu", &fwd_port, buf, | |
475 | &fwd_host_port) != 3) { | |
5260325f | 476 | fprintf(stderr, "Bad forwarding specification '%s'.\n", optarg); |
477 | usage(); | |
478 | /* NOTREACHED */ | |
479 | } | |
480 | add_remote_forward(&options, fwd_port, buf, fwd_host_port); | |
481 | break; | |
5260325f | 482 | case 'L': |
48e671d5 | 483 | if (sscanf(optarg, "%hu/%255[^/]/%hu", &fwd_port, buf, |
484 | &fwd_host_port) != 3 && | |
485 | sscanf(optarg, "%hu:%255[^:]:%hu", &fwd_port, buf, | |
486 | &fwd_host_port) != 3) { | |
5260325f | 487 | fprintf(stderr, "Bad forwarding specification '%s'.\n", optarg); |
488 | usage(); | |
489 | /* NOTREACHED */ | |
490 | } | |
491 | add_local_forward(&options, fwd_port, buf, fwd_host_port); | |
492 | break; | |
0490e609 | 493 | |
494 | case 'D': | |
2d2a2c65 | 495 | fwd_port = a2port(optarg); |
496 | if (fwd_port == 0) { | |
497 | fprintf(stderr, "Bad dynamic port '%s'\n", optarg); | |
6031af8d | 498 | exit(1); |
499 | } | |
0490e609 | 500 | add_local_forward(&options, fwd_port, "socks4", 0); |
501 | break; | |
502 | ||
5260325f | 503 | case 'C': |
504 | options.compression = 1; | |
505 | break; | |
8ce64345 | 506 | case 'N': |
507 | no_shell_flag = 1; | |
508 | no_tty_flag = 1; | |
509 | break; | |
8ce64345 | 510 | case 'T': |
511 | no_tty_flag = 1; | |
512 | break; | |
5260325f | 513 | case 'o': |
514 | dummy = 1; | |
515 | if (process_config_line(&options, host ? host : "", optarg, | |
516 | "command-line", 0, &dummy) != 0) | |
517 | exit(1); | |
518 | break; | |
ae810de7 | 519 | case 's': |
520 | subsystem_flag = 1; | |
521 | break; | |
3435f5a6 | 522 | case 'b': |
523 | options.bind_address = optarg; | |
524 | break; | |
5260325f | 525 | default: |
526 | usage(); | |
527 | } | |
528 | } | |
529 | ||
530 | /* Check that we got a host name. */ | |
531 | if (!host) | |
8efc0c15 | 532 | usage(); |
5260325f | 533 | |
22d89d24 | 534 | SSLeay_add_all_algorithms(); |
fa08c86b | 535 | ERR_load_crypto_strings(); |
22d89d24 | 536 | |
5260325f | 537 | /* Initialize the command to execute on remote host. */ |
538 | buffer_init(&command); | |
539 | ||
aa3378df | 540 | /* |
541 | * Save the command to execute on the remote host in a buffer. There | |
542 | * is no limit on the length of the command, except by the maximum | |
543 | * packet size. Also sets the tty flag if there is no command. | |
544 | */ | |
5260325f | 545 | if (optind == ac) { |
546 | /* No command specified - execute shell on a tty. */ | |
547 | tty_flag = 1; | |
ae810de7 | 548 | if (subsystem_flag) { |
57aa8961 | 549 | fprintf(stderr, "You must specify a subsystem to invoke.\n"); |
ae810de7 | 550 | usage(); |
551 | } | |
5260325f | 552 | } else { |
553 | /* A command has been specified. Store it into the | |
554 | buffer. */ | |
555 | for (i = optind; i < ac; i++) { | |
556 | if (i > optind) | |
557 | buffer_append(&command, " ", 1); | |
558 | buffer_append(&command, av[i], strlen(av[i])); | |
559 | } | |
8efc0c15 | 560 | } |
5260325f | 561 | |
562 | /* Cannot fork to background if no command. */ | |
14a9a859 | 563 | if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag) |
5260325f | 564 | fatal("Cannot fork into background without a command to execute."); |
565 | ||
566 | /* Allocate a tty by default if no command specified. */ | |
567 | if (buffer_len(&command) == 0) | |
568 | tty_flag = 1; | |
569 | ||
0b6fbf03 | 570 | /* Force no tty*/ |
571 | if (no_tty_flag) | |
572 | tty_flag = 0; | |
5260325f | 573 | /* Do not allocate a tty if stdin is not a tty. */ |
8abcdba4 | 574 | if (!isatty(fileno(stdin)) && !force_tty_flag) { |
5260325f | 575 | if (tty_flag) |
54b974dc | 576 | log("Pseudo-terminal will not be allocated because stdin is not a terminal."); |
5260325f | 577 | tty_flag = 0; |
578 | } | |
8ce64345 | 579 | |
20244695 | 580 | /* |
581 | * Initialize "log" output. Since we are the client all output | |
582 | * actually goes to stderr. | |
583 | */ | |
cc44f691 | 584 | log_init(av[0], options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level, |
585 | SYSLOG_FACILITY_USER, 1); | |
5260325f | 586 | |
587 | /* Read per-user configuration file. */ | |
42f11eb2 | 588 | snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, _PATH_SSH_USER_CONFFILE); |
5260325f | 589 | read_config_file(buf, host, &options); |
590 | ||
591 | /* Read systemwide configuration file. */ | |
42f11eb2 | 592 | read_config_file(_PATH_HOST_CONFIG_FILE, host, &options); |
5260325f | 593 | |
594 | /* Fill configuration defaults. */ | |
595 | fill_default_options(&options); | |
596 | ||
597 | /* reinit */ | |
20244695 | 598 | log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 1); |
5260325f | 599 | |
e339aa53 | 600 | seed_rng(); |
601 | ||
5260325f | 602 | if (options.user == NULL) |
603 | options.user = xstrdup(pw->pw_name); | |
604 | ||
605 | if (options.hostname != NULL) | |
606 | host = options.hostname; | |
607 | ||
5260325f | 608 | /* Disable rhosts authentication if not running as root. */ |
3c62e7eb | 609 | #ifdef HAVE_CYGWIN |
610 | /* Ignore uid if running under Windows */ | |
611 | if (!options.use_privileged_port) { | |
612 | #else | |
5260325f | 613 | if (original_effective_uid != 0 || !options.use_privileged_port) { |
3c62e7eb | 614 | #endif |
6ffc9c88 | 615 | debug("Rhosts Authentication disabled, " |
616 | "originating port will not be trusted."); | |
5260325f | 617 | options.rhosts_authentication = 0; |
5260325f | 618 | } |
63bd8c36 | 619 | |
aa3378df | 620 | /* |
621 | * If using rsh has been selected, exec it now (without trying | |
622 | * anything else). Note that we must release privileges first. | |
623 | */ | |
5260325f | 624 | if (options.use_rsh) { |
aa3378df | 625 | /* |
626 | * Restore our superuser privileges. This must be done | |
627 | * before permanently setting the uid. | |
628 | */ | |
5260325f | 629 | restore_uid(); |
630 | ||
631 | /* Switch to the original uid permanently. */ | |
63bd8c36 | 632 | permanently_set_uid(pw); |
5260325f | 633 | |
634 | /* Execute rsh. */ | |
635 | rsh_connect(host, options.user, &command); | |
636 | fatal("rsh_connect returned"); | |
8efc0c15 | 637 | } |
5260325f | 638 | /* Restore our superuser privileges. */ |
639 | restore_uid(); | |
640 | ||
6ffc9c88 | 641 | /* Open a connection to the remote host. */ |
5260325f | 642 | |
643 | ok = ssh_connect(host, &hostaddr, options.port, | |
6ffc9c88 | 644 | options.connection_attempts, |
645 | original_effective_uid != 0 || !options.use_privileged_port, | |
63bd8c36 | 646 | pw, options.proxy_command); |
5260325f | 647 | |
aa3378df | 648 | /* |
649 | * If we successfully made the connection, load the host private key | |
650 | * in case we will need it later for combined rsa-rhosts | |
651 | * authentication. This must be done before releasing extra | |
652 | * privileges, because the file is only readable by root. | |
653 | */ | |
8002af61 | 654 | sensitive_data.nkeys = 0; |
655 | sensitive_data.keys = NULL; | |
656 | if (ok && (options.rhosts_rsa_authentication || | |
657 | options.hostbased_authentication)) { | |
658 | sensitive_data.nkeys = 3; | |
659 | sensitive_data.keys = xmalloc(sensitive_data.nkeys*sizeof(Key)); | |
660 | sensitive_data.keys[0] = key_load_private_type(KEY_RSA1, | |
aeaa3d9e | 661 | _PATH_HOST_KEY_FILE, "", NULL); |
8002af61 | 662 | sensitive_data.keys[1] = key_load_private_type(KEY_DSA, |
663 | _PATH_HOST_DSA_KEY_FILE, "", NULL); | |
664 | sensitive_data.keys[2] = key_load_private_type(KEY_RSA, | |
665 | _PATH_HOST_RSA_KEY_FILE, "", NULL); | |
5260325f | 666 | } |
aa3378df | 667 | /* |
668 | * Get rid of any extra privileges that we may have. We will no | |
669 | * longer need them. Also, extra privileges could make it very hard | |
670 | * to read identity files and other non-world-readable files from the | |
671 | * user's home directory if it happens to be on a NFS volume where | |
672 | * root is mapped to nobody. | |
673 | */ | |
674 | ||
675 | /* | |
676 | * Note that some legacy systems need to postpone the following call | |
677 | * to permanently_set_uid() until the private hostkey is destroyed | |
678 | * with RSA_free(). Otherwise the calling user could ptrace() the | |
679 | * process, read the private hostkey and impersonate the host. | |
680 | * OpenBSD does not allow ptracing of setuid processes. | |
681 | */ | |
63bd8c36 | 682 | permanently_set_uid(pw); |
5260325f | 683 | |
aa3378df | 684 | /* |
685 | * Now that we are back to our own permissions, create ~/.ssh | |
686 | * directory if it doesn\'t already exist. | |
687 | */ | |
42f11eb2 | 688 | snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, _PATH_SSH_USER_DIR); |
5260325f | 689 | if (stat(buf, &st) < 0) |
704b1659 | 690 | if (mkdir(buf, 0700) < 0) |
5260325f | 691 | error("Could not create directory '%.200s'.", buf); |
692 | ||
693 | /* Check if the connection failed, and try "rsh" if appropriate. */ | |
694 | if (!ok) { | |
695 | if (options.port != 0) | |
57112b5a | 696 | log("Secure connection to %.100s on port %hu refused%.100s.", |
5260325f | 697 | host, options.port, |
698 | options.fallback_to_rsh ? "; reverting to insecure method" : ""); | |
699 | else | |
700 | log("Secure connection to %.100s refused%.100s.", host, | |
701 | options.fallback_to_rsh ? "; reverting to insecure method" : ""); | |
702 | ||
703 | if (options.fallback_to_rsh) { | |
704 | rsh_connect(host, options.user, &command); | |
705 | fatal("rsh_connect returned"); | |
706 | } | |
707 | exit(1); | |
8efc0c15 | 708 | } |
fee56204 | 709 | /* load options.identity_files */ |
710 | load_public_identity_files(); | |
711 | ||
712 | /* Expand ~ in known host file names. */ | |
713 | /* XXX mem-leaks: */ | |
fa08c86b | 714 | options.system_hostfile = |
715 | tilde_expand_filename(options.system_hostfile, original_real_uid); | |
716 | options.user_hostfile = | |
717 | tilde_expand_filename(options.user_hostfile, original_real_uid); | |
718 | options.system_hostfile2 = | |
719 | tilde_expand_filename(options.system_hostfile2, original_real_uid); | |
720 | options.user_hostfile2 = | |
721 | tilde_expand_filename(options.user_hostfile2, original_real_uid); | |
5260325f | 722 | |
723 | /* Log into the remote system. This never returns if the login fails. */ | |
8002af61 | 724 | ssh_login(sensitive_data.keys, sensitive_data.nkeys, |
725 | host, (struct sockaddr *)&hostaddr, pw); | |
726 | ||
727 | /* We no longer need the private host keys. Clear them now. */ | |
728 | if (sensitive_data.nkeys != 0) { | |
729 | for (i = 0; i < sensitive_data.nkeys; i++) { | |
730 | if (sensitive_data.keys[i] != NULL) { | |
731 | /* Destroys contents safely */ | |
732 | debug3("clear hostkey %d", i); | |
733 | key_free(sensitive_data.keys[i]); | |
734 | sensitive_data.keys[i] = NULL; | |
735 | } | |
736 | } | |
737 | xfree(sensitive_data.keys); | |
738 | } | |
5260325f | 739 | |
8ce64345 | 740 | exit_status = compat20 ? ssh_session2() : ssh_session(); |
741 | packet_close(); | |
742 | return exit_status; | |
743 | } | |
744 | ||
396c147e | 745 | static void |
0b242b12 | 746 | x11_get_proto(char *proto, int proto_len, char *data, int data_len) |
747 | { | |
748 | char line[512]; | |
749 | FILE *f; | |
750 | int got_data = 0, i; | |
751 | ||
fa649821 | 752 | if (options.xauth_location) { |
753 | /* Try to get Xauthority information for the display. */ | |
5ca51e19 | 754 | snprintf(line, sizeof line, "%.100s list %.200s 2>" _PATH_DEVNULL, |
fa649821 | 755 | options.xauth_location, getenv("DISPLAY")); |
756 | f = popen(line, "r"); | |
757 | if (f && fgets(line, sizeof(line), f) && | |
758 | sscanf(line, "%*s %s %s", proto, data) == 2) | |
759 | got_data = 1; | |
760 | if (f) | |
761 | pclose(f); | |
762 | } | |
0b242b12 | 763 | /* |
764 | * If we didn't get authentication data, just make up some | |
765 | * data. The forwarding code will check the validity of the | |
766 | * response anyway, and substitute this data. The X11 | |
767 | * server, however, will ignore this fake data and use | |
768 | * whatever authentication mechanisms it was using otherwise | |
769 | * for the local connection. | |
770 | */ | |
771 | if (!got_data) { | |
772 | u_int32_t rand = 0; | |
773 | ||
774 | strlcpy(proto, "MIT-MAGIC-COOKIE-1", proto_len); | |
775 | for (i = 0; i < 16; i++) { | |
776 | if (i % 4 == 0) | |
777 | rand = arc4random(); | |
778 | snprintf(data + 2 * i, data_len - 2 * i, "%02x", rand & 0xff); | |
779 | rand >>= 8; | |
780 | } | |
781 | } | |
782 | } | |
783 | ||
396c147e | 784 | static void |
fa08c86b | 785 | ssh_init_forwarding(void) |
786 | { | |
02a024dd | 787 | int success = 0; |
fa08c86b | 788 | int i; |
02a024dd | 789 | |
fa08c86b | 790 | /* Initiate local TCP/IP port forwardings. */ |
791 | for (i = 0; i < options.num_local_forwards; i++) { | |
792 | debug("Connections to local port %d forwarded to remote address %.200s:%d", | |
793 | options.local_forwards[i].port, | |
794 | options.local_forwards[i].host, | |
795 | options.local_forwards[i].host_port); | |
02a024dd | 796 | success += channel_request_local_forwarding( |
fa08c86b | 797 | options.local_forwards[i].port, |
798 | options.local_forwards[i].host, | |
799 | options.local_forwards[i].host_port, | |
800 | options.gateway_ports); | |
801 | } | |
02a024dd | 802 | if (i > 0 && success == 0) |
803 | error("Could not request local forwarding."); | |
fa08c86b | 804 | |
805 | /* Initiate remote TCP/IP port forwardings. */ | |
806 | for (i = 0; i < options.num_remote_forwards; i++) { | |
807 | debug("Connections to remote port %d forwarded to local address %.200s:%d", | |
808 | options.remote_forwards[i].port, | |
809 | options.remote_forwards[i].host, | |
810 | options.remote_forwards[i].host_port); | |
811 | channel_request_remote_forwarding( | |
812 | options.remote_forwards[i].port, | |
813 | options.remote_forwards[i].host, | |
814 | options.remote_forwards[i].host_port); | |
815 | } | |
816 | } | |
817 | ||
396c147e | 818 | static void |
fa08c86b | 819 | check_agent_present(void) |
820 | { | |
821 | if (options.forward_agent) { | |
822 | /* Clear agent forwarding if we don\'t have an agent. */ | |
823 | int authfd = ssh_get_authentication_socket(); | |
824 | if (authfd < 0) | |
825 | options.forward_agent = 0; | |
826 | else | |
827 | ssh_close_authentication_socket(authfd); | |
828 | } | |
829 | } | |
830 | ||
396c147e | 831 | static int |
8ce64345 | 832 | ssh_session(void) |
833 | { | |
834 | int type; | |
8ce64345 | 835 | int plen; |
836 | int interactive = 0; | |
837 | int have_tty = 0; | |
838 | struct winsize ws; | |
8ce64345 | 839 | char *cp; |
840 | ||
5260325f | 841 | /* Enable compression if requested. */ |
842 | if (options.compression) { | |
843 | debug("Requesting compression at level %d.", options.compression_level); | |
844 | ||
845 | if (options.compression_level < 1 || options.compression_level > 9) | |
846 | fatal("Compression level must be from 1 (fast) to 9 (slow, best)."); | |
847 | ||
848 | /* Send the request. */ | |
849 | packet_start(SSH_CMSG_REQUEST_COMPRESSION); | |
850 | packet_put_int(options.compression_level); | |
851 | packet_send(); | |
852 | packet_write_wait(); | |
853 | type = packet_read(&plen); | |
854 | if (type == SSH_SMSG_SUCCESS) | |
855 | packet_start_compression(options.compression_level); | |
856 | else if (type == SSH_SMSG_FAILURE) | |
857 | log("Warning: Remote host refused compression."); | |
858 | else | |
859 | packet_disconnect("Protocol error waiting for compression response."); | |
860 | } | |
861 | /* Allocate a pseudo tty if appropriate. */ | |
862 | if (tty_flag) { | |
863 | debug("Requesting pty."); | |
864 | ||
865 | /* Start the packet. */ | |
866 | packet_start(SSH_CMSG_REQUEST_PTY); | |
867 | ||
868 | /* Store TERM in the packet. There is no limit on the | |
869 | length of the string. */ | |
870 | cp = getenv("TERM"); | |
871 | if (!cp) | |
872 | cp = ""; | |
449c5ba5 | 873 | packet_put_cstring(cp); |
5260325f | 874 | |
875 | /* Store window size in the packet. */ | |
876 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) | |
877 | memset(&ws, 0, sizeof(ws)); | |
878 | packet_put_int(ws.ws_row); | |
879 | packet_put_int(ws.ws_col); | |
880 | packet_put_int(ws.ws_xpixel); | |
881 | packet_put_int(ws.ws_ypixel); | |
882 | ||
883 | /* Store tty modes in the packet. */ | |
30dcc918 | 884 | tty_make_modes(fileno(stdin), NULL); |
5260325f | 885 | |
886 | /* Send the packet, and wait for it to leave. */ | |
887 | packet_send(); | |
888 | packet_write_wait(); | |
889 | ||
890 | /* Read response from the server. */ | |
891 | type = packet_read(&plen); | |
4fe2af09 | 892 | if (type == SSH_SMSG_SUCCESS) { |
5260325f | 893 | interactive = 1; |
8ce64345 | 894 | have_tty = 1; |
4fe2af09 | 895 | } else if (type == SSH_SMSG_FAILURE) |
5260325f | 896 | log("Warning: Remote host failed or refused to allocate a pseudo tty."); |
897 | else | |
898 | packet_disconnect("Protocol error waiting for pty request response."); | |
899 | } | |
900 | /* Request X11 forwarding if enabled and DISPLAY is set. */ | |
901 | if (options.forward_x11 && getenv("DISPLAY") != NULL) { | |
0b242b12 | 902 | char proto[512], data[512]; |
903 | /* Get reasonable local authentication information. */ | |
904 | x11_get_proto(proto, sizeof proto, data, sizeof data); | |
905 | /* Request forwarding with authentication spoofing. */ | |
5260325f | 906 | debug("Requesting X11 forwarding with authentication spoofing."); |
0b242b12 | 907 | x11_request_forwarding_with_spoofing(0, proto, data); |
5260325f | 908 | |
909 | /* Read response from the server. */ | |
910 | type = packet_read(&plen); | |
911 | if (type == SSH_SMSG_SUCCESS) { | |
5260325f | 912 | interactive = 1; |
0b242b12 | 913 | } else if (type == SSH_SMSG_FAILURE) { |
5260325f | 914 | log("Warning: Remote host denied X11 forwarding."); |
0b242b12 | 915 | } else { |
5260325f | 916 | packet_disconnect("Protocol error waiting for X11 forwarding"); |
0b242b12 | 917 | } |
5260325f | 918 | } |
919 | /* Tell the packet module whether this is an interactive session. */ | |
b5c334cc | 920 | packet_set_interactive(interactive); |
5260325f | 921 | |
922 | /* Request authentication agent forwarding if appropriate. */ | |
fa08c86b | 923 | check_agent_present(); |
924 | ||
5260325f | 925 | if (options.forward_agent) { |
926 | debug("Requesting authentication agent forwarding."); | |
927 | auth_request_forwarding(); | |
928 | ||
929 | /* Read response from the server. */ | |
930 | type = packet_read(&plen); | |
931 | packet_integrity_check(plen, 0, type); | |
932 | if (type != SSH_SMSG_SUCCESS) | |
933 | log("Warning: Remote host denied authentication agent forwarding."); | |
934 | } | |
8efc0c15 | 935 | |
fa08c86b | 936 | /* Initiate port forwardings. */ |
937 | ssh_init_forwarding(); | |
5260325f | 938 | |
aa3378df | 939 | /* If requested, let ssh continue in the background. */ |
6ae2364d | 940 | if (fork_after_authentication_flag) |
aa3378df | 941 | if (daemon(1, 1) < 0) |
942 | fatal("daemon() failed: %.200s", strerror(errno)); | |
943 | ||
944 | /* | |
945 | * If a command was specified on the command line, execute the | |
946 | * command now. Otherwise request the server to start a shell. | |
947 | */ | |
5260325f | 948 | if (buffer_len(&command) > 0) { |
949 | int len = buffer_len(&command); | |
950 | if (len > 900) | |
951 | len = 900; | |
952 | debug("Sending command: %.*s", len, buffer_ptr(&command)); | |
953 | packet_start(SSH_CMSG_EXEC_CMD); | |
954 | packet_put_string(buffer_ptr(&command), buffer_len(&command)); | |
955 | packet_send(); | |
956 | packet_write_wait(); | |
957 | } else { | |
958 | debug("Requesting shell."); | |
959 | packet_start(SSH_CMSG_EXEC_SHELL); | |
960 | packet_send(); | |
961 | packet_write_wait(); | |
962 | } | |
963 | ||
964 | /* Enter the interactive session. */ | |
4bf9c10e | 965 | return client_loop(have_tty, tty_flag ? |
966 | options.escape_char : SSH_ESCAPECHAR_NONE, 0); | |
8ce64345 | 967 | } |
5260325f | 968 | |
396c147e | 969 | static void |
1f3bf5aa | 970 | client_subsystem_reply(int type, int plen, void *ctxt) |
971 | { | |
972 | int id, len; | |
973 | ||
974 | id = packet_get_int(); | |
975 | len = buffer_len(&command); | |
ce91d6f8 | 976 | if (len > 900) |
977 | len = 900; | |
1f3bf5aa | 978 | packet_done(); |
979 | if (type == SSH2_MSG_CHANNEL_FAILURE) | |
980 | fatal("Request for subsystem '%.*s' failed on channel %d", | |
981 | len, buffer_ptr(&command), id); | |
982 | } | |
983 | ||
396c147e | 984 | static void |
fa08c86b | 985 | ssh_session2_callback(int id, void *arg) |
8ce64345 | 986 | { |
987 | int len; | |
b5c334cc | 988 | int interactive = 0; |
30dcc918 | 989 | struct termios tio; |
b5c334cc | 990 | |
6a416424 | 991 | debug("client_init id %d arg %ld", id, (long)arg); |
8ce64345 | 992 | |
8ce64345 | 993 | if (tty_flag) { |
994 | struct winsize ws; | |
995 | char *cp; | |
996 | cp = getenv("TERM"); | |
997 | if (!cp) | |
998 | cp = ""; | |
999 | /* Store window size in the packet. */ | |
1000 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) | |
1001 | memset(&ws, 0, sizeof(ws)); | |
1002 | ||
1003 | channel_request_start(id, "pty-req", 0); | |
1004 | packet_put_cstring(cp); | |
1005 | packet_put_int(ws.ws_col); | |
1006 | packet_put_int(ws.ws_row); | |
1007 | packet_put_int(ws.ws_xpixel); | |
1008 | packet_put_int(ws.ws_ypixel); | |
30dcc918 | 1009 | tio = get_saved_tio(); |
1010 | tty_make_modes(/*ignored*/ 0, &tio); | |
8ce64345 | 1011 | packet_send(); |
b5c334cc | 1012 | interactive = 1; |
8ce64345 | 1013 | /* XXX wait for reply */ |
1014 | } | |
0b242b12 | 1015 | if (options.forward_x11 && |
1016 | getenv("DISPLAY") != NULL) { | |
1017 | char proto[512], data[512]; | |
1018 | /* Get reasonable local authentication information. */ | |
1019 | x11_get_proto(proto, sizeof proto, data, sizeof data); | |
1020 | /* Request forwarding with authentication spoofing. */ | |
1021 | debug("Requesting X11 forwarding with authentication spoofing."); | |
1022 | x11_request_forwarding_with_spoofing(id, proto, data); | |
b5c334cc | 1023 | interactive = 1; |
0b242b12 | 1024 | /* XXX wait for reply */ |
1025 | } | |
1026 | ||
fa08c86b | 1027 | check_agent_present(); |
1028 | if (options.forward_agent) { | |
1029 | debug("Requesting authentication agent forwarding."); | |
1030 | channel_request_start(id, "auth-agent-req@openssh.com", 0); | |
1031 | packet_send(); | |
1032 | } | |
1033 | ||
8ce64345 | 1034 | len = buffer_len(&command); |
1035 | if (len > 0) { | |
1036 | if (len > 900) | |
1037 | len = 900; | |
ae810de7 | 1038 | if (subsystem_flag) { |
1039 | debug("Sending subsystem: %.*s", len, buffer_ptr(&command)); | |
1f3bf5aa | 1040 | channel_request_start(id, "subsystem", /*want reply*/ 1); |
1041 | /* register callback for reply */ | |
1042 | /* XXX we asume that client_loop has already been called */ | |
1043 | dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &client_subsystem_reply); | |
1044 | dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &client_subsystem_reply); | |
ae810de7 | 1045 | } else { |
1046 | debug("Sending command: %.*s", len, buffer_ptr(&command)); | |
1047 | channel_request_start(id, "exec", 0); | |
1048 | } | |
ce91d6f8 | 1049 | packet_put_string(buffer_ptr(&command), buffer_len(&command)); |
8ce64345 | 1050 | packet_send(); |
1051 | } else { | |
1052 | channel_request(id, "shell", 0); | |
1053 | } | |
1054 | /* channel_callback(id, SSH2_MSG_OPEN_CONFIGMATION, client_init, 0); */ | |
1f3bf5aa | 1055 | |
8ce64345 | 1056 | /* register different callback, etc. XXX */ |
b5c334cc | 1057 | packet_set_interactive(interactive); |
8ce64345 | 1058 | } |
1059 | ||
396c147e | 1060 | static int |
eb0dd41f | 1061 | ssh_session2_command(void) |
8ce64345 | 1062 | { |
719fc62f | 1063 | Channel *c; |
1064 | int window, packetmax, in, out, err; | |
2e73a022 | 1065 | |
14a9a859 | 1066 | if (stdin_null_flag) { |
5ca51e19 | 1067 | in = open(_PATH_DEVNULL, O_RDONLY); |
14a9a859 | 1068 | } else { |
1069 | in = dup(STDIN_FILENO); | |
1070 | } | |
2e73a022 | 1071 | out = dup(STDOUT_FILENO); |
1072 | err = dup(STDERR_FILENO); | |
8ce64345 | 1073 | |
1074 | if (in < 0 || out < 0 || err < 0) | |
14a9a859 | 1075 | fatal("dup() in/out/err failed"); |
8ce64345 | 1076 | |
a22aff1f | 1077 | /* enable nonblocking unless tty */ |
1078 | if (!isatty(in)) | |
1079 | set_nonblock(in); | |
1080 | if (!isatty(out)) | |
1081 | set_nonblock(out); | |
1082 | if (!isatty(err)) | |
1083 | set_nonblock(err); | |
1084 | ||
bcbf86ec | 1085 | window = CHAN_SES_WINDOW_DEFAULT; |
1086 | packetmax = CHAN_SES_PACKET_DEFAULT; | |
1087 | if (!tty_flag) { | |
8ce64345 | 1088 | window *= 2; |
bcbf86ec | 1089 | packetmax *=2; |
8ce64345 | 1090 | } |
719fc62f | 1091 | c = channel_new( |
8ce64345 | 1092 | "session", SSH_CHANNEL_OPENING, in, out, err, |
bcbf86ec | 1093 | window, packetmax, CHAN_EXTENDED_WRITE, |
a22aff1f | 1094 | xstrdup("client-session"), /*nonblock*/0); |
719fc62f | 1095 | if (c == NULL) |
1096 | fatal("ssh_session2_command: channel_new failed"); | |
8ce64345 | 1097 | |
719fc62f | 1098 | debug3("ssh_session2_command: channel_new: %d", c->self); |
eb0dd41f | 1099 | |
36e1f6a1 | 1100 | channel_send_open(c->self); |
719fc62f | 1101 | channel_register_callback(c->self, SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, |
fa08c86b | 1102 | ssh_session2_callback, (void *)0); |
5260325f | 1103 | |
719fc62f | 1104 | return c->self; |
eb0dd41f | 1105 | } |
1106 | ||
396c147e | 1107 | static int |
eb0dd41f | 1108 | ssh_session2(void) |
1109 | { | |
1110 | int id; | |
1111 | ||
1112 | /* XXX should be pre-session */ | |
1113 | ssh_init_forwarding(); | |
1114 | ||
1115 | id = no_shell_flag ? -1 : ssh_session2_command(); | |
1116 | ||
1117 | /* If requested, let ssh continue in the background. */ | |
1118 | if (fork_after_authentication_flag) | |
1119 | if (daemon(1, 1) < 0) | |
1120 | fatal("daemon() failed: %.200s", strerror(errno)); | |
1121 | ||
4bf9c10e | 1122 | return client_loop(tty_flag, tty_flag ? |
1123 | options.escape_char : SSH_ESCAPECHAR_NONE, id); | |
8efc0c15 | 1124 | } |
fa08c86b | 1125 | |
396c147e | 1126 | static void |
fee56204 | 1127 | load_public_identity_files(void) |
1128 | { | |
1129 | char *filename; | |
1130 | Key *public; | |
1131 | int i; | |
1132 | ||
1133 | for (i = 0; i < options.num_identity_files; i++) { | |
1134 | filename = tilde_expand_filename(options.identity_files[i], | |
1135 | original_real_uid); | |
aeaa3d9e | 1136 | public = key_load_public(filename, NULL); |
fee56204 | 1137 | debug("identity file %s type %d", filename, |
1138 | public ? public->type : -1); | |
1139 | xfree(options.identity_files[i]); | |
1140 | options.identity_files[i] = filename; | |
1141 | options.identity_keys[i] = public; | |
1142 | } | |
1143 | } |