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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. | |
5fb274c1 | 16 | * Copyright (c) 2000, 2001, 2002 Markus Friedl. All rights reserved. |
bcbf86ec | 17 | * |
18 | * Modified to work with SSL by Niels Provos <provos@citi.umich.edu> | |
19 | * in Canada (German citizen). | |
20 | * | |
21 | * Redistribution and use in source and binary forms, with or without | |
22 | * modification, are permitted provided that the following conditions | |
23 | * are met: | |
24 | * 1. Redistributions of source code must retain the above copyright | |
25 | * notice, this list of conditions and the following disclaimer. | |
26 | * 2. Redistributions in binary form must reproduce the above copyright | |
27 | * notice, this list of conditions and the following disclaimer in the | |
28 | * documentation and/or other materials provided with the distribution. | |
29 | * | |
30 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
31 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
32 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
33 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
34 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
35 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
36 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
37 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
38 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
39 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
5260325f | 40 | */ |
8efc0c15 | 41 | |
42 | #include "includes.h" | |
c242fc96 | 43 | RCSID("$OpenBSD: ssh.c,v 1.172 2002/05/22 23:18:25 deraadt Exp $"); |
8efc0c15 | 44 | |
a306f2dd | 45 | #include <openssl/evp.h> |
fa08c86b | 46 | #include <openssl/err.h> |
a306f2dd | 47 | |
8efc0c15 | 48 | #include "ssh.h" |
42f11eb2 | 49 | #include "ssh1.h" |
50 | #include "ssh2.h" | |
51 | #include "compat.h" | |
52 | #include "cipher.h" | |
53 | #include "xmalloc.h" | |
8efc0c15 | 54 | #include "packet.h" |
55 | #include "buffer.h" | |
8efc0c15 | 56 | #include "uidswap.h" |
a5efa1bb | 57 | #include "channels.h" |
a306f2dd | 58 | #include "key.h" |
4c8722d9 | 59 | #include "authfd.h" |
a306f2dd | 60 | #include "authfile.h" |
42f11eb2 | 61 | #include "pathnames.h" |
b5c334cc | 62 | #include "clientloop.h" |
42f11eb2 | 63 | #include "log.h" |
64 | #include "readconf.h" | |
65 | #include "sshconnect.h" | |
66 | #include "tildexpand.h" | |
1f3bf5aa | 67 | #include "dispatch.h" |
42f11eb2 | 68 | #include "misc.h" |
b2552997 | 69 | #include "kex.h" |
70 | #include "mac.h" | |
30dcc918 | 71 | #include "sshtty.h" |
8efc0c15 | 72 | |
383546c4 | 73 | #ifdef SMARTCARD |
383546c4 | 74 | #include "scard.h" |
dd2495cb | 75 | #endif |
383546c4 | 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 | |
c242fc96 | 110 | * so that the passphrase can be entered manually, and then ssh goes to the |
aa3378df | 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 | ||
e591b98a | 121 | /* optional user configfile */ |
122 | char *config = NULL; | |
123 | ||
aa3378df | 124 | /* |
125 | * Name of the host we are connecting to. This is the name given on the | |
126 | * command line, or the HostName specified for the user-supplied name in a | |
127 | * configuration file. | |
128 | */ | |
8efc0c15 | 129 | char *host; |
130 | ||
131 | /* socket address the host resolves to */ | |
48e671d5 | 132 | struct sockaddr_storage hostaddr; |
8efc0c15 | 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 | ||
e0ae8728 | 149 | /* # of replies received for global requests */ |
150 | static int client_global_request_id = 0; | |
151 | ||
8efc0c15 | 152 | /* Prints a help message to the user. This function never returns. */ |
153 | ||
396c147e | 154 | static void |
5ca51e19 | 155 | usage(void) |
8efc0c15 | 156 | { |
1fe6a48f | 157 | fprintf(stderr, "Usage: %s [options] host [command]\n", __progname); |
5260325f | 158 | fprintf(stderr, "Options:\n"); |
159 | fprintf(stderr, " -l user Log in using this user name.\n"); | |
5ca51e19 | 160 | fprintf(stderr, " -n Redirect input from " _PATH_DEVNULL ".\n"); |
e591b98a | 161 | fprintf(stderr, " -F config Config file (default: ~/%s).\n", |
162 | _PATH_SSH_USER_CONFFILE); | |
71276795 | 163 | fprintf(stderr, " -A Enable authentication agent forwarding.\n"); |
63cd7dd0 | 164 | fprintf(stderr, " -a Disable authentication agent forwarding (default).\n"); |
8efc0c15 | 165 | #ifdef AFS |
5260325f | 166 | fprintf(stderr, " -k Disable Kerberos ticket and AFS token forwarding.\n"); |
167 | #endif /* AFS */ | |
2b87da3b | 168 | fprintf(stderr, " -X Enable X11 connection forwarding.\n"); |
63cd7dd0 | 169 | fprintf(stderr, " -x Disable X11 connection forwarding (default).\n"); |
a01a5f30 | 170 | fprintf(stderr, " -i file Identity for public key authentication " |
171 | "(default: ~/.ssh/identity)\n"); | |
315dfb04 | 172 | #ifdef SMARTCARD |
173 | fprintf(stderr, " -I reader Set smartcard reader.\n"); | |
dd2495cb | 174 | #endif |
5260325f | 175 | fprintf(stderr, " -t Tty; allocate a tty even if command is given.\n"); |
8ce64345 | 176 | fprintf(stderr, " -T Do not allocate a tty.\n"); |
5260325f | 177 | fprintf(stderr, " -v Verbose; display verbose debugging messages.\n"); |
bcbf86ec | 178 | fprintf(stderr, " Multiple -v increases verbosity.\n"); |
5260325f | 179 | fprintf(stderr, " -V Display version number only.\n"); |
180 | fprintf(stderr, " -P Don't allocate a privileged port.\n"); | |
181 | fprintf(stderr, " -q Quiet; don't display any warning messages.\n"); | |
182 | fprintf(stderr, " -f Fork into background after authentication.\n"); | |
183 | fprintf(stderr, " -e char Set escape character; ``none'' = disable (default: ~).\n"); | |
184 | ||
63cd7dd0 | 185 | fprintf(stderr, " -c cipher Select encryption algorithm\n"); |
38967add | 186 | fprintf(stderr, " -m macs Specify MAC algorithms for protocol version 2.\n"); |
5260325f | 187 | fprintf(stderr, " -p port Connect to this port. Server must be on the same port.\n"); |
188 | fprintf(stderr, " -L listen-port:host:port Forward local port to remote address\n"); | |
189 | fprintf(stderr, " -R listen-port:host:port Forward remote port to local address\n"); | |
1fe6a48f | 190 | fprintf(stderr, " These cause %s to listen for connections on a port, and\n", __progname); |
5260325f | 191 | fprintf(stderr, " forward them to the other side by connecting to host:port.\n"); |
4c780c2a | 192 | fprintf(stderr, " -D port Enable dynamic application-level port forwarding.\n"); |
5260325f | 193 | fprintf(stderr, " -C Enable compression.\n"); |
8ce64345 | 194 | fprintf(stderr, " -N Do not execute a shell or command.\n"); |
5260325f | 195 | fprintf(stderr, " -g Allow remote hosts to connect to forwarded ports.\n"); |
1f3bf5aa | 196 | fprintf(stderr, " -1 Force protocol version 1.\n"); |
197 | fprintf(stderr, " -2 Force protocol version 2.\n"); | |
48e671d5 | 198 | fprintf(stderr, " -4 Use IPv4 only.\n"); |
199 | fprintf(stderr, " -6 Use IPv6 only.\n"); | |
5260325f | 200 | fprintf(stderr, " -o 'option' Process the option as if it was read from a configuration file.\n"); |
ae810de7 | 201 | fprintf(stderr, " -s Invoke command (mandatory) as SSH2 subsystem.\n"); |
63cd7dd0 | 202 | fprintf(stderr, " -b addr Local IP address.\n"); |
5260325f | 203 | exit(1); |
8efc0c15 | 204 | } |
205 | ||
5260325f | 206 | /* |
207 | * Connects to the given host using rsh (or prints an error message and exits | |
208 | * if rsh is not available). This function never returns. | |
209 | */ | |
396c147e | 210 | static void |
5260325f | 211 | rsh_connect(char *host, char *user, Buffer * command) |
8efc0c15 | 212 | { |
5260325f | 213 | char *args[10]; |
214 | int i; | |
215 | ||
216 | log("Using rsh. WARNING: Connection will not be encrypted."); | |
217 | /* Build argument list for rsh. */ | |
218 | i = 0; | |
219 | args[i++] = _PATH_RSH; | |
220 | /* host may have to come after user on some systems */ | |
221 | args[i++] = host; | |
222 | if (user) { | |
223 | args[i++] = "-l"; | |
224 | args[i++] = user; | |
225 | } | |
226 | if (buffer_len(command) > 0) { | |
227 | buffer_append(command, "\0", 1); | |
228 | args[i++] = buffer_ptr(command); | |
229 | } | |
230 | args[i++] = NULL; | |
231 | if (debug_flag) { | |
232 | for (i = 0; args[i]; i++) { | |
233 | if (i != 0) | |
234 | fprintf(stderr, " "); | |
235 | fprintf(stderr, "%s", args[i]); | |
236 | } | |
237 | fprintf(stderr, "\n"); | |
8efc0c15 | 238 | } |
5260325f | 239 | execv(_PATH_RSH, args); |
240 | perror(_PATH_RSH); | |
241 | exit(1); | |
8efc0c15 | 242 | } |
243 | ||
396c147e | 244 | static int ssh_session(void); |
245 | static int ssh_session2(void); | |
246 | static void load_public_identity_files(void); | |
8ce64345 | 247 | |
5260325f | 248 | /* |
249 | * Main program for the ssh client. | |
250 | */ | |
8efc0c15 | 251 | int |
252 | main(int ac, char **av) | |
253 | { | |
ce773142 | 254 | int i, opt, exit_status, cerr; |
57112b5a | 255 | u_short fwd_port, fwd_host_port; |
d2e3df16 | 256 | char sfwd_port[6], sfwd_host_port[6]; |
f5a1a01a | 257 | char *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; |
57dade33 | 262 | extern int optind, optreset; |
1812a662 | 263 | extern char *optarg; |
5260325f | 264 | |
260d427b | 265 | __progname = get_progname(av[0]); |
264dce47 | 266 | init_rng(); |
267 | ||
aa3378df | 268 | /* |
269 | * Save the original real uid. It will be needed later (uid-swapping | |
270 | * may clobber the real uid). | |
271 | */ | |
5260325f | 272 | original_real_uid = getuid(); |
273 | original_effective_uid = geteuid(); | |
274 | ||
7322ef0e | 275 | #ifdef HAVE_SETRLIMIT |
5260325f | 276 | /* If we are installed setuid root be careful to not drop core. */ |
277 | if (original_real_uid != original_effective_uid) { | |
278 | struct rlimit rlim; | |
279 | rlim.rlim_cur = rlim.rlim_max = 0; | |
280 | if (setrlimit(RLIMIT_CORE, &rlim) < 0) | |
281 | fatal("setrlimit failed: %.100s", strerror(errno)); | |
8efc0c15 | 282 | } |
3c62e7eb | 283 | #endif |
63bd8c36 | 284 | /* Get user data. */ |
285 | pw = getpwuid(original_real_uid); | |
286 | if (!pw) { | |
287 | log("You don't exist, go away!"); | |
288 | exit(1); | |
289 | } | |
290 | /* Take a copy of the returned structure. */ | |
291 | pw = pwcopy(pw); | |
292 | ||
aa3378df | 293 | /* |
294 | * Use uid-swapping to give up root privileges for the duration of | |
295 | * option processing. We will re-instantiate the rights when we are | |
296 | * ready to create the privileged port, and will permanently drop | |
297 | * them when the port has been created (actually, when the connection | |
298 | * has been made, as we may need to create the port several times). | |
299 | */ | |
63bd8c36 | 300 | temporarily_use_uid(pw); |
5260325f | 301 | |
aa3378df | 302 | /* |
303 | * Set our umask to something reasonable, as some files are created | |
304 | * with the default umask. This will make them world-readable but | |
305 | * writable only by the owner, which is ok for all files for which we | |
306 | * don't set the modes explicitly. | |
307 | */ | |
5260325f | 308 | umask(022); |
309 | ||
5260325f | 310 | /* Initialize option structure to indicate that no values have been set. */ |
311 | initialize_options(&options); | |
312 | ||
313 | /* Parse command-line arguments. */ | |
314 | host = NULL; | |
315 | ||
f5a1a01a | 316 | again: |
317 | while ((opt = getopt(ac, av, | |
e591b98a | 318 | "1246ab:c:e:fgi:kl:m:no:p:qstvxACD:F:I:L:NPR:TVX")) != -1) { |
5260325f | 319 | switch (opt) { |
1f3bf5aa | 320 | case '1': |
321 | options.protocol = SSH_PROTO_1; | |
322 | break; | |
6ae2364d | 323 | case '2': |
324 | options.protocol = SSH_PROTO_2; | |
325 | break; | |
48e671d5 | 326 | case '4': |
327 | IPv4or6 = AF_INET; | |
328 | break; | |
48e671d5 | 329 | case '6': |
330 | IPv4or6 = AF_INET6; | |
331 | break; | |
5260325f | 332 | case 'n': |
333 | stdin_null_flag = 1; | |
334 | break; | |
5260325f | 335 | case 'f': |
336 | fork_after_authentication_flag = 1; | |
337 | stdin_null_flag = 1; | |
338 | break; | |
5260325f | 339 | case 'x': |
340 | options.forward_x11 = 0; | |
341 | break; | |
5260325f | 342 | case 'X': |
343 | options.forward_x11 = 1; | |
344 | break; | |
5260325f | 345 | case 'g': |
346 | options.gateway_ports = 1; | |
347 | break; | |
5260325f | 348 | case 'P': |
349 | options.use_privileged_port = 0; | |
350 | break; | |
5260325f | 351 | case 'a': |
352 | options.forward_agent = 0; | |
353 | break; | |
71276795 | 354 | case 'A': |
355 | options.forward_agent = 1; | |
356 | break; | |
5260325f | 357 | #ifdef AFS |
358 | case 'k': | |
359 | options.kerberos_tgt_passing = 0; | |
360 | options.afs_token_passing = 0; | |
361 | break; | |
362 | #endif | |
363 | case 'i': | |
364 | if (stat(optarg, &st) < 0) { | |
f5a1a01a | 365 | fprintf(stderr, "Warning: Identity file %s " |
366 | "does not exist.\n", optarg); | |
5260325f | 367 | break; |
368 | } | |
f5a1a01a | 369 | if (options.num_identity_files >= |
370 | SSH_MAX_IDENTITY_FILES) | |
371 | fatal("Too many identity files specified " | |
372 | "(max %d)", SSH_MAX_IDENTITY_FILES); | |
373 | options.identity_files[options.num_identity_files++] = | |
374 | xstrdup(optarg); | |
5260325f | 375 | break; |
383546c4 | 376 | case 'I': |
377 | #ifdef SMARTCARD | |
9ff6f66f | 378 | options.smartcard_device = xstrdup(optarg); |
dd2495cb | 379 | #else |
383546c4 | 380 | fprintf(stderr, "no support for smartcards.\n"); |
dd2495cb | 381 | #endif |
383546c4 | 382 | break; |
5260325f | 383 | case 't': |
8abcdba4 | 384 | if (tty_flag) |
385 | force_tty_flag = 1; | |
5260325f | 386 | tty_flag = 1; |
387 | break; | |
5260325f | 388 | case 'v': |
bcbf86ec | 389 | if (0 == debug_flag) { |
390 | debug_flag = 1; | |
391 | options.log_level = SYSLOG_LEVEL_DEBUG1; | |
392 | } else if (options.log_level < SYSLOG_LEVEL_DEBUG3) { | |
393 | options.log_level++; | |
394 | break; | |
f5a1a01a | 395 | } else |
54b974dc | 396 | fatal("Too high debugging level."); |
bcbf86ec | 397 | /* fallthrough */ |
5260325f | 398 | case 'V': |
e68225b2 | 399 | fprintf(stderr, |
400 | "%s, SSH protocols %d.%d/%d.%d, OpenSSL 0x%8.8lx\n", | |
a8be9f80 | 401 | SSH_VERSION, |
402 | PROTOCOL_MAJOR_1, PROTOCOL_MINOR_1, | |
e68225b2 | 403 | PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2, |
404 | SSLeay()); | |
5260325f | 405 | if (opt == 'V') |
406 | exit(0); | |
5260325f | 407 | break; |
5260325f | 408 | case 'q': |
409 | options.log_level = SYSLOG_LEVEL_QUIET; | |
410 | break; | |
5260325f | 411 | case 'e': |
412 | if (optarg[0] == '^' && optarg[2] == 0 && | |
f5a1a01a | 413 | (u_char) optarg[1] >= 64 && |
414 | (u_char) optarg[1] < 128) | |
1e3b8b07 | 415 | options.escape_char = (u_char) optarg[1] & 31; |
5260325f | 416 | else if (strlen(optarg) == 1) |
1e3b8b07 | 417 | options.escape_char = (u_char) optarg[0]; |
5260325f | 418 | else if (strcmp(optarg, "none") == 0) |
4bf9c10e | 419 | options.escape_char = SSH_ESCAPECHAR_NONE; |
5260325f | 420 | else { |
f5a1a01a | 421 | fprintf(stderr, "Bad escape character '%s'.\n", |
422 | optarg); | |
5260325f | 423 | exit(1); |
424 | } | |
425 | break; | |
5260325f | 426 | case 'c': |
a306f2dd | 427 | if (ciphers_valid(optarg)) { |
428 | /* SSH2 only */ | |
429 | options.ciphers = xstrdup(optarg); | |
d0c832f3 | 430 | options.cipher = SSH_CIPHER_ILLEGAL; |
a306f2dd | 431 | } else { |
432 | /* SSH1 only */ | |
c523303b | 433 | options.cipher = cipher_number(optarg); |
434 | if (options.cipher == -1) { | |
f5a1a01a | 435 | fprintf(stderr, |
436 | "Unknown cipher type '%s'\n", | |
437 | optarg); | |
a306f2dd | 438 | exit(1); |
439 | } | |
f5a1a01a | 440 | if (options.cipher == SSH_CIPHER_3DES) |
c523303b | 441 | options.ciphers = "3des-cbc"; |
f5a1a01a | 442 | else if (options.cipher == SSH_CIPHER_BLOWFISH) |
c523303b | 443 | options.ciphers = "blowfish-cbc"; |
f5a1a01a | 444 | else |
c523303b | 445 | options.ciphers = (char *)-1; |
5260325f | 446 | } |
447 | break; | |
b2552997 | 448 | case 'm': |
449 | if (mac_valid(optarg)) | |
450 | options.macs = xstrdup(optarg); | |
451 | else { | |
f5a1a01a | 452 | fprintf(stderr, "Unknown mac type '%s'\n", |
453 | optarg); | |
b2552997 | 454 | exit(1); |
455 | } | |
456 | break; | |
5260325f | 457 | case 'p': |
2d2a2c65 | 458 | options.port = a2port(optarg); |
459 | if (options.port == 0) { | |
6031af8d | 460 | fprintf(stderr, "Bad port '%s'\n", optarg); |
461 | exit(1); | |
462 | } | |
5260325f | 463 | break; |
5260325f | 464 | case 'l': |
465 | options.user = optarg; | |
466 | break; | |
d2e3df16 | 467 | |
468 | case 'L': | |
5260325f | 469 | case 'R': |
d2e3df16 | 470 | if (sscanf(optarg, "%5[0-9]:%255[^:]:%5[0-9]", |
471 | sfwd_port, buf, sfwd_host_port) != 3 && | |
472 | sscanf(optarg, "%5[0-9]/%255[^/]/%5[0-9]", | |
473 | sfwd_port, buf, sfwd_host_port) != 3) { | |
f5a1a01a | 474 | fprintf(stderr, |
d2e3df16 | 475 | "Bad forwarding specification '%s'\n", |
f5a1a01a | 476 | optarg); |
5260325f | 477 | usage(); |
478 | /* NOTREACHED */ | |
479 | } | |
d2e3df16 | 480 | if ((fwd_port = a2port(sfwd_port)) == 0 || |
762715ce | 481 | (fwd_host_port = a2port(sfwd_host_port)) == 0) { |
f5a1a01a | 482 | fprintf(stderr, |
d2e3df16 | 483 | "Bad forwarding port(s) '%s'\n", optarg); |
484 | exit(1); | |
5260325f | 485 | } |
d2e3df16 | 486 | if (opt == 'L') |
487 | add_local_forward(&options, fwd_port, buf, | |
488 | fwd_host_port); | |
489 | else if (opt == 'R') | |
490 | add_remote_forward(&options, fwd_port, buf, | |
184eed6a | 491 | fwd_host_port); |
5260325f | 492 | break; |
0490e609 | 493 | |
494 | case 'D': | |
2d2a2c65 | 495 | fwd_port = a2port(optarg); |
496 | if (fwd_port == 0) { | |
f5a1a01a | 497 | fprintf(stderr, "Bad dynamic port '%s'\n", |
498 | optarg); | |
6031af8d | 499 | exit(1); |
500 | } | |
0490e609 | 501 | add_local_forward(&options, fwd_port, "socks4", 0); |
502 | break; | |
503 | ||
5260325f | 504 | case 'C': |
505 | options.compression = 1; | |
506 | break; | |
8ce64345 | 507 | case 'N': |
508 | no_shell_flag = 1; | |
509 | no_tty_flag = 1; | |
510 | break; | |
8ce64345 | 511 | case 'T': |
512 | no_tty_flag = 1; | |
513 | break; | |
5260325f | 514 | case 'o': |
515 | dummy = 1; | |
f5a1a01a | 516 | if (process_config_line(&options, host ? host : "", |
517 | optarg, "command-line", 0, &dummy) != 0) | |
5260325f | 518 | exit(1); |
519 | break; | |
ae810de7 | 520 | case 's': |
521 | subsystem_flag = 1; | |
522 | break; | |
3435f5a6 | 523 | case 'b': |
524 | options.bind_address = optarg; | |
525 | break; | |
e591b98a | 526 | case 'F': |
527 | config = optarg; | |
528 | break; | |
5260325f | 529 | default: |
530 | usage(); | |
531 | } | |
532 | } | |
533 | ||
f5a1a01a | 534 | ac -= optind; |
535 | av += optind; | |
536 | ||
537 | if (ac > 0 && !host && **av != '-') { | |
538 | if (strchr(*av, '@')) { | |
539 | p = xstrdup(*av); | |
540 | cp = strchr(p, '@'); | |
541 | if (cp == NULL || cp == p) | |
542 | usage(); | |
543 | options.user = p; | |
544 | *cp = '\0'; | |
545 | host = ++cp; | |
546 | } else | |
547 | host = *av; | |
548 | ac--, av++; | |
549 | if (ac > 0) { | |
550 | optind = 0; | |
551 | optreset = 1; | |
552 | goto again; | |
553 | } | |
554 | } | |
555 | ||
5260325f | 556 | /* Check that we got a host name. */ |
557 | if (!host) | |
8efc0c15 | 558 | usage(); |
5260325f | 559 | |
22d89d24 | 560 | SSLeay_add_all_algorithms(); |
fa08c86b | 561 | ERR_load_crypto_strings(); |
5e4a7219 | 562 | channel_set_af(IPv4or6); |
22d89d24 | 563 | |
5260325f | 564 | /* Initialize the command to execute on remote host. */ |
565 | buffer_init(&command); | |
566 | ||
aa3378df | 567 | /* |
568 | * Save the command to execute on the remote host in a buffer. There | |
569 | * is no limit on the length of the command, except by the maximum | |
570 | * packet size. Also sets the tty flag if there is no command. | |
571 | */ | |
f5a1a01a | 572 | if (!ac) { |
5260325f | 573 | /* No command specified - execute shell on a tty. */ |
574 | tty_flag = 1; | |
ae810de7 | 575 | if (subsystem_flag) { |
f5a1a01a | 576 | fprintf(stderr, |
577 | "You must specify a subsystem to invoke.\n"); | |
ae810de7 | 578 | usage(); |
579 | } | |
5260325f | 580 | } else { |
f5a1a01a | 581 | /* A command has been specified. Store it into the buffer. */ |
582 | for (i = 0; i < ac; i++) { | |
583 | if (i) | |
5260325f | 584 | buffer_append(&command, " ", 1); |
585 | buffer_append(&command, av[i], strlen(av[i])); | |
586 | } | |
8efc0c15 | 587 | } |
5260325f | 588 | |
589 | /* Cannot fork to background if no command. */ | |
14a9a859 | 590 | if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag) |
5260325f | 591 | fatal("Cannot fork into background without a command to execute."); |
592 | ||
593 | /* Allocate a tty by default if no command specified. */ | |
594 | if (buffer_len(&command) == 0) | |
595 | tty_flag = 1; | |
596 | ||
0b6fbf03 | 597 | /* Force no tty*/ |
598 | if (no_tty_flag) | |
599 | tty_flag = 0; | |
5260325f | 600 | /* Do not allocate a tty if stdin is not a tty. */ |
8abcdba4 | 601 | if (!isatty(fileno(stdin)) && !force_tty_flag) { |
5260325f | 602 | if (tty_flag) |
54b974dc | 603 | log("Pseudo-terminal will not be allocated because stdin is not a terminal."); |
5260325f | 604 | tty_flag = 0; |
605 | } | |
8ce64345 | 606 | |
20244695 | 607 | /* |
608 | * Initialize "log" output. Since we are the client all output | |
609 | * actually goes to stderr. | |
610 | */ | |
cc44f691 | 611 | log_init(av[0], options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level, |
612 | SYSLOG_FACILITY_USER, 1); | |
5260325f | 613 | |
e591b98a | 614 | /* |
615 | * Read per-user configuration file. Ignore the system wide config | |
616 | * file if the user specifies a config file on the command line. | |
617 | */ | |
618 | if (config != NULL) { | |
93111dfa | 619 | if (!read_config_file(config, host, &options)) |
620 | fatal("Can't open user config file %.100s: " | |
621 | "%.100s", config, strerror(errno)); | |
e591b98a | 622 | } else { |
623 | snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, | |
624 | _PATH_SSH_USER_CONFFILE); | |
f67792f2 | 625 | (void)read_config_file(buf, host, &options); |
e591b98a | 626 | |
f67792f2 | 627 | /* Read systemwide configuration file after use config. */ |
93111dfa | 628 | (void)read_config_file(_PATH_HOST_CONFIG_FILE, host, &options); |
e591b98a | 629 | } |
5260325f | 630 | |
631 | /* Fill configuration defaults. */ | |
632 | fill_default_options(&options); | |
633 | ||
634 | /* reinit */ | |
20244695 | 635 | log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 1); |
5260325f | 636 | |
e339aa53 | 637 | seed_rng(); |
638 | ||
5260325f | 639 | if (options.user == NULL) |
640 | options.user = xstrdup(pw->pw_name); | |
641 | ||
642 | if (options.hostname != NULL) | |
643 | host = options.hostname; | |
644 | ||
5260325f | 645 | /* Disable rhosts authentication if not running as root. */ |
3c62e7eb | 646 | #ifdef HAVE_CYGWIN |
647 | /* Ignore uid if running under Windows */ | |
648 | if (!options.use_privileged_port) { | |
649 | #else | |
5260325f | 650 | if (original_effective_uid != 0 || !options.use_privileged_port) { |
3c62e7eb | 651 | #endif |
6ffc9c88 | 652 | debug("Rhosts Authentication disabled, " |
653 | "originating port will not be trusted."); | |
5260325f | 654 | options.rhosts_authentication = 0; |
5260325f | 655 | } |
aa3378df | 656 | /* |
657 | * If using rsh has been selected, exec it now (without trying | |
658 | * anything else). Note that we must release privileges first. | |
659 | */ | |
5260325f | 660 | if (options.use_rsh) { |
aa3378df | 661 | /* |
662 | * Restore our superuser privileges. This must be done | |
663 | * before permanently setting the uid. | |
664 | */ | |
5260325f | 665 | restore_uid(); |
666 | ||
667 | /* Switch to the original uid permanently. */ | |
63bd8c36 | 668 | permanently_set_uid(pw); |
5260325f | 669 | |
670 | /* Execute rsh. */ | |
671 | rsh_connect(host, options.user, &command); | |
672 | fatal("rsh_connect returned"); | |
8efc0c15 | 673 | } |
5260325f | 674 | /* Restore our superuser privileges. */ |
675 | restore_uid(); | |
676 | ||
6ffc9c88 | 677 | /* Open a connection to the remote host. */ |
5260325f | 678 | |
dab89049 | 679 | cerr = ssh_connect(host, &hostaddr, options.port, IPv4or6, |
6ffc9c88 | 680 | options.connection_attempts, |
681 | original_effective_uid != 0 || !options.use_privileged_port, | |
63bd8c36 | 682 | pw, options.proxy_command); |
5260325f | 683 | |
aa3378df | 684 | /* |
685 | * If we successfully made the connection, load the host private key | |
686 | * in case we will need it later for combined rsa-rhosts | |
687 | * authentication. This must be done before releasing extra | |
688 | * privileges, because the file is only readable by root. | |
689 | */ | |
8002af61 | 690 | sensitive_data.nkeys = 0; |
691 | sensitive_data.keys = NULL; | |
ce773142 | 692 | if (!cerr && (options.rhosts_rsa_authentication || |
8002af61 | 693 | options.hostbased_authentication)) { |
694 | sensitive_data.nkeys = 3; | |
695 | sensitive_data.keys = xmalloc(sensitive_data.nkeys*sizeof(Key)); | |
696 | sensitive_data.keys[0] = key_load_private_type(KEY_RSA1, | |
aeaa3d9e | 697 | _PATH_HOST_KEY_FILE, "", NULL); |
8002af61 | 698 | sensitive_data.keys[1] = key_load_private_type(KEY_DSA, |
699 | _PATH_HOST_DSA_KEY_FILE, "", NULL); | |
700 | sensitive_data.keys[2] = key_load_private_type(KEY_RSA, | |
701 | _PATH_HOST_RSA_KEY_FILE, "", NULL); | |
5260325f | 702 | } |
aa3378df | 703 | /* |
704 | * Get rid of any extra privileges that we may have. We will no | |
705 | * longer need them. Also, extra privileges could make it very hard | |
706 | * to read identity files and other non-world-readable files from the | |
707 | * user's home directory if it happens to be on a NFS volume where | |
708 | * root is mapped to nobody. | |
709 | */ | |
710 | ||
711 | /* | |
712 | * Note that some legacy systems need to postpone the following call | |
713 | * to permanently_set_uid() until the private hostkey is destroyed | |
714 | * with RSA_free(). Otherwise the calling user could ptrace() the | |
715 | * process, read the private hostkey and impersonate the host. | |
716 | * OpenBSD does not allow ptracing of setuid processes. | |
717 | */ | |
63bd8c36 | 718 | permanently_set_uid(pw); |
5260325f | 719 | |
aa3378df | 720 | /* |
721 | * Now that we are back to our own permissions, create ~/.ssh | |
722 | * directory if it doesn\'t already exist. | |
723 | */ | |
c3abff07 | 724 | snprintf(buf, sizeof buf, "%.100s%s%.100s", pw->pw_dir, strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR); |
5260325f | 725 | if (stat(buf, &st) < 0) |
704b1659 | 726 | if (mkdir(buf, 0700) < 0) |
5260325f | 727 | error("Could not create directory '%.200s'.", buf); |
728 | ||
729 | /* Check if the connection failed, and try "rsh" if appropriate. */ | |
ce773142 | 730 | if (cerr) { |
731 | if (!options.fallback_to_rsh) | |
732 | exit(1); | |
5260325f | 733 | if (options.port != 0) |
ce773142 | 734 | log("Secure connection to %.100s on port %hu refused; " |
735 | "reverting to insecure method", | |
736 | host, options.port); | |
5260325f | 737 | else |
ce773142 | 738 | log("Secure connection to %.100s refused; " |
739 | "reverting to insecure method.", host); | |
5260325f | 740 | |
ce773142 | 741 | rsh_connect(host, options.user, &command); |
742 | fatal("rsh_connect returned"); | |
8efc0c15 | 743 | } |
fee56204 | 744 | /* load options.identity_files */ |
745 | load_public_identity_files(); | |
746 | ||
747 | /* Expand ~ in known host file names. */ | |
748 | /* XXX mem-leaks: */ | |
fa08c86b | 749 | options.system_hostfile = |
750 | tilde_expand_filename(options.system_hostfile, original_real_uid); | |
751 | options.user_hostfile = | |
752 | tilde_expand_filename(options.user_hostfile, original_real_uid); | |
753 | options.system_hostfile2 = | |
754 | tilde_expand_filename(options.system_hostfile2, original_real_uid); | |
755 | options.user_hostfile2 = | |
756 | tilde_expand_filename(options.user_hostfile2, original_real_uid); | |
5260325f | 757 | |
67b75437 | 758 | signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */ |
759 | ||
5260325f | 760 | /* Log into the remote system. This never returns if the login fails. */ |
8002af61 | 761 | ssh_login(sensitive_data.keys, sensitive_data.nkeys, |
762 | host, (struct sockaddr *)&hostaddr, pw); | |
763 | ||
764 | /* We no longer need the private host keys. Clear them now. */ | |
765 | if (sensitive_data.nkeys != 0) { | |
766 | for (i = 0; i < sensitive_data.nkeys; i++) { | |
767 | if (sensitive_data.keys[i] != NULL) { | |
768 | /* Destroys contents safely */ | |
769 | debug3("clear hostkey %d", i); | |
770 | key_free(sensitive_data.keys[i]); | |
771 | sensitive_data.keys[i] = NULL; | |
772 | } | |
773 | } | |
774 | xfree(sensitive_data.keys); | |
775 | } | |
05b7537a | 776 | for (i = 0; i < options.num_identity_files; i++) { |
777 | if (options.identity_files[i]) { | |
778 | xfree(options.identity_files[i]); | |
779 | options.identity_files[i] = NULL; | |
780 | } | |
781 | if (options.identity_keys[i]) { | |
782 | key_free(options.identity_keys[i]); | |
783 | options.identity_keys[i] = NULL; | |
784 | } | |
785 | } | |
5260325f | 786 | |
8ce64345 | 787 | exit_status = compat20 ? ssh_session2() : ssh_session(); |
788 | packet_close(); | |
789 | return exit_status; | |
790 | } | |
791 | ||
396c147e | 792 | static void |
b48eeb07 | 793 | x11_get_proto(char **_proto, char **_data) |
0b242b12 | 794 | { |
795 | char line[512]; | |
b48eeb07 | 796 | static char proto[512], data[512]; |
0b242b12 | 797 | FILE *f; |
798 | int got_data = 0, i; | |
75a624f0 | 799 | char *display; |
0b242b12 | 800 | |
b48eeb07 | 801 | *_proto = proto; |
802 | *_data = data; | |
803 | proto[0] = data[0] = '\0'; | |
75a624f0 | 804 | if (options.xauth_location && (display = getenv("DISPLAY"))) { |
fa649821 | 805 | /* Try to get Xauthority information for the display. */ |
75a624f0 | 806 | if (strncmp(display, "localhost:", 10) == 0) |
807 | /* | |
808 | * Handle FamilyLocal case where $DISPLAY does | |
809 | * not match an authorization entry. For this we | |
810 | * just try "xauth list unix:displaynum.screennum". | |
811 | * XXX: "localhost" match to determine FamilyLocal | |
812 | * is not perfect. | |
813 | */ | |
375e20e7 | 814 | snprintf(line, sizeof line, "%s list unix:%s 2>" |
75a624f0 | 815 | _PATH_DEVNULL, options.xauth_location, display+10); |
816 | else | |
375e20e7 | 817 | snprintf(line, sizeof line, "%s list %.200s 2>" |
75a624f0 | 818 | _PATH_DEVNULL, options.xauth_location, display); |
819 | debug2("x11_get_proto %s", line); | |
fa649821 | 820 | f = popen(line, "r"); |
821 | if (f && fgets(line, sizeof(line), f) && | |
b48eeb07 | 822 | sscanf(line, "%*s %511s %511s", proto, data) == 2) |
fa649821 | 823 | got_data = 1; |
824 | if (f) | |
825 | pclose(f); | |
826 | } | |
0b242b12 | 827 | /* |
828 | * If we didn't get authentication data, just make up some | |
829 | * data. The forwarding code will check the validity of the | |
830 | * response anyway, and substitute this data. The X11 | |
831 | * server, however, will ignore this fake data and use | |
832 | * whatever authentication mechanisms it was using otherwise | |
833 | * for the local connection. | |
834 | */ | |
835 | if (!got_data) { | |
836 | u_int32_t rand = 0; | |
837 | ||
b48eeb07 | 838 | strlcpy(proto, "MIT-MAGIC-COOKIE-1", sizeof proto); |
0b242b12 | 839 | for (i = 0; i < 16; i++) { |
840 | if (i % 4 == 0) | |
841 | rand = arc4random(); | |
b48eeb07 | 842 | snprintf(data + 2 * i, sizeof data - 2 * i, "%02x", rand & 0xff); |
0b242b12 | 843 | rand >>= 8; |
844 | } | |
845 | } | |
846 | } | |
847 | ||
396c147e | 848 | static void |
fa08c86b | 849 | ssh_init_forwarding(void) |
850 | { | |
02a024dd | 851 | int success = 0; |
fa08c86b | 852 | int i; |
02a024dd | 853 | |
fa08c86b | 854 | /* Initiate local TCP/IP port forwardings. */ |
855 | for (i = 0; i < options.num_local_forwards; i++) { | |
856 | debug("Connections to local port %d forwarded to remote address %.200s:%d", | |
857 | options.local_forwards[i].port, | |
858 | options.local_forwards[i].host, | |
859 | options.local_forwards[i].host_port); | |
5641aefa | 860 | success += channel_setup_local_fwd_listener( |
fa08c86b | 861 | options.local_forwards[i].port, |
862 | options.local_forwards[i].host, | |
863 | options.local_forwards[i].host_port, | |
864 | options.gateway_ports); | |
865 | } | |
02a024dd | 866 | if (i > 0 && success == 0) |
867 | error("Could not request local forwarding."); | |
fa08c86b | 868 | |
869 | /* Initiate remote TCP/IP port forwardings. */ | |
870 | for (i = 0; i < options.num_remote_forwards; i++) { | |
871 | debug("Connections to remote port %d forwarded to local address %.200s:%d", | |
872 | options.remote_forwards[i].port, | |
873 | options.remote_forwards[i].host, | |
874 | options.remote_forwards[i].host_port); | |
875 | channel_request_remote_forwarding( | |
876 | options.remote_forwards[i].port, | |
877 | options.remote_forwards[i].host, | |
878 | options.remote_forwards[i].host_port); | |
879 | } | |
880 | } | |
881 | ||
396c147e | 882 | static void |
fa08c86b | 883 | check_agent_present(void) |
884 | { | |
885 | if (options.forward_agent) { | |
886 | /* Clear agent forwarding if we don\'t have an agent. */ | |
887 | int authfd = ssh_get_authentication_socket(); | |
888 | if (authfd < 0) | |
889 | options.forward_agent = 0; | |
890 | else | |
891 | ssh_close_authentication_socket(authfd); | |
892 | } | |
893 | } | |
894 | ||
396c147e | 895 | static int |
8ce64345 | 896 | ssh_session(void) |
897 | { | |
898 | int type; | |
8ce64345 | 899 | int interactive = 0; |
900 | int have_tty = 0; | |
901 | struct winsize ws; | |
8ce64345 | 902 | char *cp; |
903 | ||
5260325f | 904 | /* Enable compression if requested. */ |
905 | if (options.compression) { | |
906 | debug("Requesting compression at level %d.", options.compression_level); | |
907 | ||
908 | if (options.compression_level < 1 || options.compression_level > 9) | |
909 | fatal("Compression level must be from 1 (fast) to 9 (slow, best)."); | |
910 | ||
911 | /* Send the request. */ | |
912 | packet_start(SSH_CMSG_REQUEST_COMPRESSION); | |
913 | packet_put_int(options.compression_level); | |
914 | packet_send(); | |
915 | packet_write_wait(); | |
54a5250f | 916 | type = packet_read(); |
5260325f | 917 | if (type == SSH_SMSG_SUCCESS) |
918 | packet_start_compression(options.compression_level); | |
919 | else if (type == SSH_SMSG_FAILURE) | |
920 | log("Warning: Remote host refused compression."); | |
921 | else | |
922 | packet_disconnect("Protocol error waiting for compression response."); | |
923 | } | |
924 | /* Allocate a pseudo tty if appropriate. */ | |
925 | if (tty_flag) { | |
926 | debug("Requesting pty."); | |
927 | ||
928 | /* Start the packet. */ | |
929 | packet_start(SSH_CMSG_REQUEST_PTY); | |
930 | ||
931 | /* Store TERM in the packet. There is no limit on the | |
932 | length of the string. */ | |
933 | cp = getenv("TERM"); | |
934 | if (!cp) | |
935 | cp = ""; | |
449c5ba5 | 936 | packet_put_cstring(cp); |
5260325f | 937 | |
938 | /* Store window size in the packet. */ | |
939 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) | |
940 | memset(&ws, 0, sizeof(ws)); | |
941 | packet_put_int(ws.ws_row); | |
942 | packet_put_int(ws.ws_col); | |
943 | packet_put_int(ws.ws_xpixel); | |
944 | packet_put_int(ws.ws_ypixel); | |
945 | ||
946 | /* Store tty modes in the packet. */ | |
30dcc918 | 947 | tty_make_modes(fileno(stdin), NULL); |
5260325f | 948 | |
949 | /* Send the packet, and wait for it to leave. */ | |
950 | packet_send(); | |
951 | packet_write_wait(); | |
952 | ||
953 | /* Read response from the server. */ | |
54a5250f | 954 | type = packet_read(); |
4fe2af09 | 955 | if (type == SSH_SMSG_SUCCESS) { |
5260325f | 956 | interactive = 1; |
8ce64345 | 957 | have_tty = 1; |
4fe2af09 | 958 | } else if (type == SSH_SMSG_FAILURE) |
5260325f | 959 | log("Warning: Remote host failed or refused to allocate a pseudo tty."); |
960 | else | |
961 | packet_disconnect("Protocol error waiting for pty request response."); | |
962 | } | |
963 | /* Request X11 forwarding if enabled and DISPLAY is set. */ | |
964 | if (options.forward_x11 && getenv("DISPLAY") != NULL) { | |
b48eeb07 | 965 | char *proto, *data; |
0b242b12 | 966 | /* Get reasonable local authentication information. */ |
b48eeb07 | 967 | x11_get_proto(&proto, &data); |
0b242b12 | 968 | /* Request forwarding with authentication spoofing. */ |
5260325f | 969 | debug("Requesting X11 forwarding with authentication spoofing."); |
0b242b12 | 970 | x11_request_forwarding_with_spoofing(0, proto, data); |
5260325f | 971 | |
972 | /* Read response from the server. */ | |
54a5250f | 973 | type = packet_read(); |
5260325f | 974 | if (type == SSH_SMSG_SUCCESS) { |
5260325f | 975 | interactive = 1; |
0b242b12 | 976 | } else if (type == SSH_SMSG_FAILURE) { |
5260325f | 977 | log("Warning: Remote host denied X11 forwarding."); |
0b242b12 | 978 | } else { |
5260325f | 979 | packet_disconnect("Protocol error waiting for X11 forwarding"); |
0b242b12 | 980 | } |
5260325f | 981 | } |
982 | /* Tell the packet module whether this is an interactive session. */ | |
b5c334cc | 983 | packet_set_interactive(interactive); |
5260325f | 984 | |
985 | /* Request authentication agent forwarding if appropriate. */ | |
fa08c86b | 986 | check_agent_present(); |
987 | ||
5260325f | 988 | if (options.forward_agent) { |
989 | debug("Requesting authentication agent forwarding."); | |
990 | auth_request_forwarding(); | |
991 | ||
992 | /* Read response from the server. */ | |
54a5250f | 993 | type = packet_read(); |
95500969 | 994 | packet_check_eom(); |
5260325f | 995 | if (type != SSH_SMSG_SUCCESS) |
996 | log("Warning: Remote host denied authentication agent forwarding."); | |
997 | } | |
8efc0c15 | 998 | |
fa08c86b | 999 | /* Initiate port forwardings. */ |
1000 | ssh_init_forwarding(); | |
5260325f | 1001 | |
aa3378df | 1002 | /* If requested, let ssh continue in the background. */ |
6ae2364d | 1003 | if (fork_after_authentication_flag) |
aa3378df | 1004 | if (daemon(1, 1) < 0) |
1005 | fatal("daemon() failed: %.200s", strerror(errno)); | |
1006 | ||
1007 | /* | |
1008 | * If a command was specified on the command line, execute the | |
1009 | * command now. Otherwise request the server to start a shell. | |
1010 | */ | |
5260325f | 1011 | if (buffer_len(&command) > 0) { |
1012 | int len = buffer_len(&command); | |
1013 | if (len > 900) | |
1014 | len = 900; | |
6c0fa2b1 | 1015 | debug("Sending command: %.*s", len, (u_char *)buffer_ptr(&command)); |
5260325f | 1016 | packet_start(SSH_CMSG_EXEC_CMD); |
1017 | packet_put_string(buffer_ptr(&command), buffer_len(&command)); | |
1018 | packet_send(); | |
1019 | packet_write_wait(); | |
1020 | } else { | |
1021 | debug("Requesting shell."); | |
1022 | packet_start(SSH_CMSG_EXEC_SHELL); | |
1023 | packet_send(); | |
1024 | packet_write_wait(); | |
1025 | } | |
1026 | ||
1027 | /* Enter the interactive session. */ | |
4bf9c10e | 1028 | return client_loop(have_tty, tty_flag ? |
1029 | options.escape_char : SSH_ESCAPECHAR_NONE, 0); | |
8ce64345 | 1030 | } |
5260325f | 1031 | |
396c147e | 1032 | static void |
7819b5c3 | 1033 | client_subsystem_reply(int type, u_int32_t seq, void *ctxt) |
1f3bf5aa | 1034 | { |
1035 | int id, len; | |
1036 | ||
1037 | id = packet_get_int(); | |
1038 | len = buffer_len(&command); | |
ce91d6f8 | 1039 | if (len > 900) |
1040 | len = 900; | |
95500969 | 1041 | packet_check_eom(); |
1f3bf5aa | 1042 | if (type == SSH2_MSG_CHANNEL_FAILURE) |
1043 | fatal("Request for subsystem '%.*s' failed on channel %d", | |
6c0fa2b1 | 1044 | len, (u_char *)buffer_ptr(&command), id); |
1f3bf5aa | 1045 | } |
1046 | ||
e0ae8728 | 1047 | void |
1048 | client_global_request_reply(int type, u_int32_t seq, void *ctxt) | |
1049 | { | |
1050 | int i; | |
1051 | ||
1052 | i = client_global_request_id++; | |
1053 | if (i >= options.num_remote_forwards) { | |
1054 | debug("client_global_request_reply: too many replies %d > %d", | |
1055 | i, options.num_remote_forwards); | |
1056 | return; | |
1057 | } | |
1058 | debug("remote forward %s for: listen %d, connect %s:%d", | |
1059 | type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure", | |
1060 | options.remote_forwards[i].port, | |
1061 | options.remote_forwards[i].host, | |
1062 | options.remote_forwards[i].host_port); | |
1063 | if (type == SSH2_MSG_REQUEST_FAILURE) | |
1064 | log("Warning: remote port forwarding failed for listen port %d", | |
1065 | options.remote_forwards[i].port); | |
1066 | } | |
1067 | ||
bcdb96c2 | 1068 | /* request pty/x11/agent/tcpfwd/shell for channel */ |
396c147e | 1069 | static void |
bcdb96c2 | 1070 | ssh_session2_setup(int id, void *arg) |
8ce64345 | 1071 | { |
1072 | int len; | |
b5c334cc | 1073 | int interactive = 0; |
30dcc918 | 1074 | struct termios tio; |
b5c334cc | 1075 | |
bcdb96c2 | 1076 | debug("ssh_session2_setup: id %d", id); |
8ce64345 | 1077 | |
8ce64345 | 1078 | if (tty_flag) { |
1079 | struct winsize ws; | |
1080 | char *cp; | |
1081 | cp = getenv("TERM"); | |
1082 | if (!cp) | |
1083 | cp = ""; | |
1084 | /* Store window size in the packet. */ | |
1085 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) | |
1086 | memset(&ws, 0, sizeof(ws)); | |
1087 | ||
1088 | channel_request_start(id, "pty-req", 0); | |
1089 | packet_put_cstring(cp); | |
1090 | packet_put_int(ws.ws_col); | |
1091 | packet_put_int(ws.ws_row); | |
1092 | packet_put_int(ws.ws_xpixel); | |
1093 | packet_put_int(ws.ws_ypixel); | |
30dcc918 | 1094 | tio = get_saved_tio(); |
1095 | tty_make_modes(/*ignored*/ 0, &tio); | |
8ce64345 | 1096 | packet_send(); |
b5c334cc | 1097 | interactive = 1; |
8ce64345 | 1098 | /* XXX wait for reply */ |
1099 | } | |
0b242b12 | 1100 | if (options.forward_x11 && |
1101 | getenv("DISPLAY") != NULL) { | |
b48eeb07 | 1102 | char *proto, *data; |
0b242b12 | 1103 | /* Get reasonable local authentication information. */ |
b48eeb07 | 1104 | x11_get_proto(&proto, &data); |
0b242b12 | 1105 | /* Request forwarding with authentication spoofing. */ |
1106 | debug("Requesting X11 forwarding with authentication spoofing."); | |
1107 | x11_request_forwarding_with_spoofing(id, proto, data); | |
b5c334cc | 1108 | interactive = 1; |
0b242b12 | 1109 | /* XXX wait for reply */ |
1110 | } | |
1111 | ||
fa08c86b | 1112 | check_agent_present(); |
1113 | if (options.forward_agent) { | |
1114 | debug("Requesting authentication agent forwarding."); | |
1115 | channel_request_start(id, "auth-agent-req@openssh.com", 0); | |
1116 | packet_send(); | |
1117 | } | |
1118 | ||
8ce64345 | 1119 | len = buffer_len(&command); |
1120 | if (len > 0) { | |
1121 | if (len > 900) | |
1122 | len = 900; | |
ae810de7 | 1123 | if (subsystem_flag) { |
6c0fa2b1 | 1124 | debug("Sending subsystem: %.*s", len, (u_char *)buffer_ptr(&command)); |
1f3bf5aa | 1125 | channel_request_start(id, "subsystem", /*want reply*/ 1); |
1126 | /* register callback for reply */ | |
c242fc96 | 1127 | /* XXX we assume that client_loop has already been called */ |
1f3bf5aa | 1128 | dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &client_subsystem_reply); |
1129 | dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &client_subsystem_reply); | |
ae810de7 | 1130 | } else { |
6c0fa2b1 | 1131 | debug("Sending command: %.*s", len, (u_char *)buffer_ptr(&command)); |
ae810de7 | 1132 | channel_request_start(id, "exec", 0); |
1133 | } | |
ce91d6f8 | 1134 | packet_put_string(buffer_ptr(&command), buffer_len(&command)); |
8ce64345 | 1135 | packet_send(); |
1136 | } else { | |
06ee33fb | 1137 | channel_request_start(id, "shell", 0); |
1138 | packet_send(); | |
8ce64345 | 1139 | } |
1f3bf5aa | 1140 | |
b5c334cc | 1141 | packet_set_interactive(interactive); |
8ce64345 | 1142 | } |
1143 | ||
bcdb96c2 | 1144 | /* open new channel for a session */ |
396c147e | 1145 | static int |
bcdb96c2 | 1146 | ssh_session2_open(void) |
8ce64345 | 1147 | { |
719fc62f | 1148 | Channel *c; |
1149 | int window, packetmax, in, out, err; | |
2e73a022 | 1150 | |
14a9a859 | 1151 | if (stdin_null_flag) { |
5ca51e19 | 1152 | in = open(_PATH_DEVNULL, O_RDONLY); |
14a9a859 | 1153 | } else { |
1154 | in = dup(STDIN_FILENO); | |
1155 | } | |
2e73a022 | 1156 | out = dup(STDOUT_FILENO); |
1157 | err = dup(STDERR_FILENO); | |
8ce64345 | 1158 | |
1159 | if (in < 0 || out < 0 || err < 0) | |
14a9a859 | 1160 | fatal("dup() in/out/err failed"); |
8ce64345 | 1161 | |
a22aff1f | 1162 | /* enable nonblocking unless tty */ |
1163 | if (!isatty(in)) | |
1164 | set_nonblock(in); | |
1165 | if (!isatty(out)) | |
1166 | set_nonblock(out); | |
1167 | if (!isatty(err)) | |
1168 | set_nonblock(err); | |
1169 | ||
bcbf86ec | 1170 | window = CHAN_SES_WINDOW_DEFAULT; |
1171 | packetmax = CHAN_SES_PACKET_DEFAULT; | |
ea9700ba | 1172 | if (tty_flag) { |
1173 | window >>= 1; | |
1174 | packetmax >>= 1; | |
8ce64345 | 1175 | } |
719fc62f | 1176 | c = channel_new( |
8ce64345 | 1177 | "session", SSH_CHANNEL_OPENING, in, out, err, |
bcbf86ec | 1178 | window, packetmax, CHAN_EXTENDED_WRITE, |
a22aff1f | 1179 | xstrdup("client-session"), /*nonblock*/0); |
8ce64345 | 1180 | |
bcdb96c2 | 1181 | debug3("ssh_session2_open: channel_new: %d", c->self); |
eb0dd41f | 1182 | |
36e1f6a1 | 1183 | channel_send_open(c->self); |
bcdb96c2 | 1184 | if (!no_shell_flag) |
05ca0898 | 1185 | channel_register_confirm(c->self, ssh_session2_setup); |
5260325f | 1186 | |
719fc62f | 1187 | return c->self; |
eb0dd41f | 1188 | } |
1189 | ||
396c147e | 1190 | static int |
eb0dd41f | 1191 | ssh_session2(void) |
1192 | { | |
bcdb96c2 | 1193 | int id = -1; |
eb0dd41f | 1194 | |
1195 | /* XXX should be pre-session */ | |
1196 | ssh_init_forwarding(); | |
1197 | ||
bcdb96c2 | 1198 | if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN)) |
1199 | id = ssh_session2_open(); | |
eb0dd41f | 1200 | |
1201 | /* If requested, let ssh continue in the background. */ | |
1202 | if (fork_after_authentication_flag) | |
1203 | if (daemon(1, 1) < 0) | |
1204 | fatal("daemon() failed: %.200s", strerror(errno)); | |
1205 | ||
4bf9c10e | 1206 | return client_loop(tty_flag, tty_flag ? |
1207 | options.escape_char : SSH_ESCAPECHAR_NONE, id); | |
8efc0c15 | 1208 | } |
fa08c86b | 1209 | |
396c147e | 1210 | static void |
fee56204 | 1211 | load_public_identity_files(void) |
1212 | { | |
1213 | char *filename; | |
2e23cde0 | 1214 | int i = 0; |
0659cace | 1215 | Key *public; |
383546c4 | 1216 | #ifdef SMARTCARD |
0659cace | 1217 | Key **keys; |
1218 | ||
9ff6f66f | 1219 | if (options.smartcard_device != NULL && |
0659cace | 1220 | options.num_identity_files < SSH_MAX_IDENTITY_FILES && |
1221 | (keys = sc_get_keys(options.smartcard_device, NULL)) != NULL ) { | |
1222 | int count = 0; | |
1223 | for (i = 0; keys[i] != NULL; i++) { | |
1224 | count++; | |
0659cace | 1225 | memmove(&options.identity_files[1], &options.identity_files[0], |
1226 | sizeof(char *) * (SSH_MAX_IDENTITY_FILES - 1)); | |
1227 | memmove(&options.identity_keys[1], &options.identity_keys[0], | |
1228 | sizeof(Key *) * (SSH_MAX_IDENTITY_FILES - 1)); | |
1229 | options.num_identity_files++; | |
1230 | options.identity_keys[0] = keys[i]; | |
1231 | options.identity_files[0] = xstrdup("smartcard key");; | |
1232 | } | |
1c2deed1 | 1233 | if (options.num_identity_files > SSH_MAX_IDENTITY_FILES) |
1234 | options.num_identity_files = SSH_MAX_IDENTITY_FILES; | |
0659cace | 1235 | i = count; |
1236 | xfree(keys); | |
383546c4 | 1237 | } |
3e984472 | 1238 | #endif /* SMARTCARD */ |
2e23cde0 | 1239 | for (; i < options.num_identity_files; i++) { |
1240 | filename = tilde_expand_filename(options.identity_files[i], | |
1241 | original_real_uid); | |
1242 | public = key_load_public(filename, NULL); | |
1243 | debug("identity file %s type %d", filename, | |
1244 | public ? public->type : -1); | |
1245 | xfree(options.identity_files[i]); | |
1246 | options.identity_files[i] = filename; | |
1247 | options.identity_keys[i] = public; | |
1248 | } | |
fee56204 | 1249 | } |