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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" | |
3a0d3d54 | 42 | RCSID("$OpenBSD: ssh.c,v 1.162 2002/02/06 14:55:16 markus Exp $"); |
8efc0c15 | 43 | |
a306f2dd | 44 | #include <openssl/evp.h> |
fa08c86b | 45 | #include <openssl/err.h> |
a306f2dd | 46 | |
8efc0c15 | 47 | #include "ssh.h" |
42f11eb2 | 48 | #include "ssh1.h" |
49 | #include "ssh2.h" | |
50 | #include "compat.h" | |
51 | #include "cipher.h" | |
52 | #include "xmalloc.h" | |
8efc0c15 | 53 | #include "packet.h" |
54 | #include "buffer.h" | |
8efc0c15 | 55 | #include "uidswap.h" |
a5efa1bb | 56 | #include "channels.h" |
a306f2dd | 57 | #include "key.h" |
4c8722d9 | 58 | #include "authfd.h" |
a306f2dd | 59 | #include "authfile.h" |
42f11eb2 | 60 | #include "pathnames.h" |
b5c334cc | 61 | #include "clientloop.h" |
42f11eb2 | 62 | #include "log.h" |
63 | #include "readconf.h" | |
64 | #include "sshconnect.h" | |
65 | #include "tildexpand.h" | |
1f3bf5aa | 66 | #include "dispatch.h" |
42f11eb2 | 67 | #include "misc.h" |
b2552997 | 68 | #include "kex.h" |
69 | #include "mac.h" | |
30dcc918 | 70 | #include "sshtty.h" |
8efc0c15 | 71 | |
383546c4 | 72 | #ifdef SMARTCARD |
73 | #include <openssl/engine.h> | |
74 | #include "scard.h" | |
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 | |
110 | * so that the pasphrase can be entered manually, and then ssh goes to the | |
111 | * background. | |
112 | */ | |
8efc0c15 | 113 | int fork_after_authentication_flag = 0; |
114 | ||
aa3378df | 115 | /* |
116 | * General data structure for command line options and options configurable | |
117 | * in configuration files. See readconf.h. | |
118 | */ | |
8efc0c15 | 119 | Options options; |
120 | ||
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 | ||
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"); |
e591b98a | 158 | fprintf(stderr, " -F config Config file (default: ~/%s).\n", |
159 | _PATH_SSH_USER_CONFFILE); | |
71276795 | 160 | fprintf(stderr, " -A Enable authentication agent forwarding.\n"); |
63cd7dd0 | 161 | fprintf(stderr, " -a Disable authentication agent forwarding (default).\n"); |
8efc0c15 | 162 | #ifdef AFS |
5260325f | 163 | fprintf(stderr, " -k Disable Kerberos ticket and AFS token forwarding.\n"); |
164 | #endif /* AFS */ | |
2b87da3b | 165 | fprintf(stderr, " -X Enable X11 connection forwarding.\n"); |
63cd7dd0 | 166 | fprintf(stderr, " -x Disable X11 connection forwarding (default).\n"); |
a01a5f30 | 167 | fprintf(stderr, " -i file Identity for public key authentication " |
168 | "(default: ~/.ssh/identity)\n"); | |
315dfb04 | 169 | #ifdef SMARTCARD |
170 | fprintf(stderr, " -I reader Set smartcard reader.\n"); | |
dd2495cb | 171 | #endif |
5260325f | 172 | fprintf(stderr, " -t Tty; allocate a tty even if command is given.\n"); |
8ce64345 | 173 | fprintf(stderr, " -T Do not allocate a tty.\n"); |
5260325f | 174 | fprintf(stderr, " -v Verbose; display verbose debugging messages.\n"); |
bcbf86ec | 175 | fprintf(stderr, " Multiple -v increases verbosity.\n"); |
5260325f | 176 | fprintf(stderr, " -V Display version number only.\n"); |
177 | fprintf(stderr, " -P Don't allocate a privileged port.\n"); | |
178 | fprintf(stderr, " -q Quiet; don't display any warning messages.\n"); | |
179 | fprintf(stderr, " -f Fork into background after authentication.\n"); | |
180 | fprintf(stderr, " -e char Set escape character; ``none'' = disable (default: ~).\n"); | |
181 | ||
63cd7dd0 | 182 | fprintf(stderr, " -c cipher Select encryption algorithm\n"); |
38967add | 183 | fprintf(stderr, " -m macs Specify MAC algorithms for protocol version 2.\n"); |
5260325f | 184 | fprintf(stderr, " -p port Connect to this port. Server must be on the same port.\n"); |
185 | fprintf(stderr, " -L listen-port:host:port Forward local port to remote address\n"); | |
186 | fprintf(stderr, " -R listen-port:host:port Forward remote port to local address\n"); | |
1fe6a48f | 187 | fprintf(stderr, " These cause %s to listen for connections on a port, and\n", __progname); |
5260325f | 188 | fprintf(stderr, " forward them to the other side by connecting to host:port.\n"); |
4c780c2a | 189 | fprintf(stderr, " -D port Enable dynamic application-level port forwarding.\n"); |
5260325f | 190 | fprintf(stderr, " -C Enable compression.\n"); |
8ce64345 | 191 | fprintf(stderr, " -N Do not execute a shell or command.\n"); |
5260325f | 192 | fprintf(stderr, " -g Allow remote hosts to connect to forwarded ports.\n"); |
1f3bf5aa | 193 | fprintf(stderr, " -1 Force protocol version 1.\n"); |
194 | fprintf(stderr, " -2 Force protocol version 2.\n"); | |
48e671d5 | 195 | fprintf(stderr, " -4 Use IPv4 only.\n"); |
196 | fprintf(stderr, " -6 Use IPv6 only.\n"); | |
5260325f | 197 | fprintf(stderr, " -o 'option' Process the option as if it was read from a configuration file.\n"); |
ae810de7 | 198 | fprintf(stderr, " -s Invoke command (mandatory) as SSH2 subsystem.\n"); |
63cd7dd0 | 199 | fprintf(stderr, " -b addr Local IP address.\n"); |
5260325f | 200 | exit(1); |
8efc0c15 | 201 | } |
202 | ||
5260325f | 203 | /* |
204 | * Connects to the given host using rsh (or prints an error message and exits | |
205 | * if rsh is not available). This function never returns. | |
206 | */ | |
396c147e | 207 | static void |
5260325f | 208 | rsh_connect(char *host, char *user, Buffer * command) |
8efc0c15 | 209 | { |
5260325f | 210 | char *args[10]; |
211 | int i; | |
212 | ||
213 | log("Using rsh. WARNING: Connection will not be encrypted."); | |
214 | /* Build argument list for rsh. */ | |
215 | i = 0; | |
216 | args[i++] = _PATH_RSH; | |
217 | /* host may have to come after user on some systems */ | |
218 | args[i++] = host; | |
219 | if (user) { | |
220 | args[i++] = "-l"; | |
221 | args[i++] = user; | |
222 | } | |
223 | if (buffer_len(command) > 0) { | |
224 | buffer_append(command, "\0", 1); | |
225 | args[i++] = buffer_ptr(command); | |
226 | } | |
227 | args[i++] = NULL; | |
228 | if (debug_flag) { | |
229 | for (i = 0; args[i]; i++) { | |
230 | if (i != 0) | |
231 | fprintf(stderr, " "); | |
232 | fprintf(stderr, "%s", args[i]); | |
233 | } | |
234 | fprintf(stderr, "\n"); | |
8efc0c15 | 235 | } |
5260325f | 236 | execv(_PATH_RSH, args); |
237 | perror(_PATH_RSH); | |
238 | exit(1); | |
8efc0c15 | 239 | } |
240 | ||
396c147e | 241 | static int ssh_session(void); |
242 | static int ssh_session2(void); | |
243 | static void load_public_identity_files(void); | |
8ce64345 | 244 | |
5260325f | 245 | /* |
246 | * Main program for the ssh client. | |
247 | */ | |
8efc0c15 | 248 | int |
249 | main(int ac, char **av) | |
250 | { | |
ce773142 | 251 | int i, opt, exit_status, cerr; |
57112b5a | 252 | u_short fwd_port, fwd_host_port; |
d2e3df16 | 253 | char sfwd_port[6], sfwd_host_port[6]; |
f5a1a01a | 254 | char *p, *cp, buf[256]; |
5260325f | 255 | struct stat st; |
3b1a83df | 256 | struct passwd *pw; |
8ce64345 | 257 | int dummy; |
5260325f | 258 | uid_t original_effective_uid; |
57dade33 | 259 | extern int optind, optreset; |
1812a662 | 260 | extern char *optarg; |
5260325f | 261 | |
260d427b | 262 | __progname = get_progname(av[0]); |
264dce47 | 263 | init_rng(); |
264 | ||
aa3378df | 265 | /* |
266 | * Save the original real uid. It will be needed later (uid-swapping | |
267 | * may clobber the real uid). | |
268 | */ | |
5260325f | 269 | original_real_uid = getuid(); |
270 | original_effective_uid = geteuid(); | |
271 | ||
7322ef0e | 272 | #ifdef HAVE_SETRLIMIT |
5260325f | 273 | /* If we are installed setuid root be careful to not drop core. */ |
274 | if (original_real_uid != original_effective_uid) { | |
275 | struct rlimit rlim; | |
276 | rlim.rlim_cur = rlim.rlim_max = 0; | |
277 | if (setrlimit(RLIMIT_CORE, &rlim) < 0) | |
278 | fatal("setrlimit failed: %.100s", strerror(errno)); | |
8efc0c15 | 279 | } |
3c62e7eb | 280 | #endif |
63bd8c36 | 281 | /* Get user data. */ |
282 | pw = getpwuid(original_real_uid); | |
283 | if (!pw) { | |
284 | log("You don't exist, go away!"); | |
285 | exit(1); | |
286 | } | |
287 | /* Take a copy of the returned structure. */ | |
288 | pw = pwcopy(pw); | |
289 | ||
aa3378df | 290 | /* |
291 | * Use uid-swapping to give up root privileges for the duration of | |
292 | * option processing. We will re-instantiate the rights when we are | |
293 | * ready to create the privileged port, and will permanently drop | |
294 | * them when the port has been created (actually, when the connection | |
295 | * has been made, as we may need to create the port several times). | |
296 | */ | |
63bd8c36 | 297 | temporarily_use_uid(pw); |
5260325f | 298 | |
aa3378df | 299 | /* |
300 | * Set our umask to something reasonable, as some files are created | |
301 | * with the default umask. This will make them world-readable but | |
302 | * writable only by the owner, which is ok for all files for which we | |
303 | * don't set the modes explicitly. | |
304 | */ | |
5260325f | 305 | umask(022); |
306 | ||
5260325f | 307 | /* Initialize option structure to indicate that no values have been set. */ |
308 | initialize_options(&options); | |
309 | ||
310 | /* Parse command-line arguments. */ | |
311 | host = NULL; | |
312 | ||
f5a1a01a | 313 | again: |
314 | while ((opt = getopt(ac, av, | |
e591b98a | 315 | "1246ab:c:e:fgi:kl:m:no:p:qstvxACD:F:I:L:NPR:TVX")) != -1) { |
5260325f | 316 | switch (opt) { |
1f3bf5aa | 317 | case '1': |
318 | options.protocol = SSH_PROTO_1; | |
319 | break; | |
6ae2364d | 320 | case '2': |
321 | options.protocol = SSH_PROTO_2; | |
322 | break; | |
48e671d5 | 323 | case '4': |
324 | IPv4or6 = AF_INET; | |
325 | break; | |
48e671d5 | 326 | case '6': |
327 | IPv4or6 = AF_INET6; | |
328 | break; | |
5260325f | 329 | case 'n': |
330 | stdin_null_flag = 1; | |
331 | break; | |
5260325f | 332 | case 'f': |
333 | fork_after_authentication_flag = 1; | |
334 | stdin_null_flag = 1; | |
335 | break; | |
5260325f | 336 | case 'x': |
337 | options.forward_x11 = 0; | |
338 | break; | |
5260325f | 339 | case 'X': |
340 | options.forward_x11 = 1; | |
341 | break; | |
5260325f | 342 | case 'g': |
343 | options.gateway_ports = 1; | |
344 | break; | |
5260325f | 345 | case 'P': |
346 | options.use_privileged_port = 0; | |
347 | break; | |
5260325f | 348 | case 'a': |
349 | options.forward_agent = 0; | |
350 | break; | |
71276795 | 351 | case 'A': |
352 | options.forward_agent = 1; | |
353 | break; | |
5260325f | 354 | #ifdef AFS |
355 | case 'k': | |
356 | options.kerberos_tgt_passing = 0; | |
357 | options.afs_token_passing = 0; | |
358 | break; | |
359 | #endif | |
360 | case 'i': | |
361 | if (stat(optarg, &st) < 0) { | |
f5a1a01a | 362 | fprintf(stderr, "Warning: Identity file %s " |
363 | "does not exist.\n", optarg); | |
5260325f | 364 | break; |
365 | } | |
f5a1a01a | 366 | if (options.num_identity_files >= |
367 | SSH_MAX_IDENTITY_FILES) | |
368 | fatal("Too many identity files specified " | |
369 | "(max %d)", SSH_MAX_IDENTITY_FILES); | |
370 | options.identity_files[options.num_identity_files++] = | |
371 | xstrdup(optarg); | |
5260325f | 372 | break; |
383546c4 | 373 | case 'I': |
374 | #ifdef SMARTCARD | |
9ff6f66f | 375 | options.smartcard_device = xstrdup(optarg); |
dd2495cb | 376 | #else |
383546c4 | 377 | fprintf(stderr, "no support for smartcards.\n"); |
dd2495cb | 378 | #endif |
383546c4 | 379 | break; |
5260325f | 380 | case 't': |
8abcdba4 | 381 | if (tty_flag) |
382 | force_tty_flag = 1; | |
5260325f | 383 | tty_flag = 1; |
384 | break; | |
5260325f | 385 | case 'v': |
bcbf86ec | 386 | if (0 == debug_flag) { |
387 | debug_flag = 1; | |
388 | options.log_level = SYSLOG_LEVEL_DEBUG1; | |
389 | } else if (options.log_level < SYSLOG_LEVEL_DEBUG3) { | |
390 | options.log_level++; | |
391 | break; | |
f5a1a01a | 392 | } else |
54b974dc | 393 | fatal("Too high debugging level."); |
bcbf86ec | 394 | /* fallthrough */ |
5260325f | 395 | case 'V': |
e68225b2 | 396 | fprintf(stderr, |
397 | "%s, SSH protocols %d.%d/%d.%d, OpenSSL 0x%8.8lx\n", | |
a8be9f80 | 398 | SSH_VERSION, |
399 | PROTOCOL_MAJOR_1, PROTOCOL_MINOR_1, | |
e68225b2 | 400 | PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2, |
401 | SSLeay()); | |
5260325f | 402 | if (opt == 'V') |
403 | exit(0); | |
5260325f | 404 | break; |
5260325f | 405 | case 'q': |
406 | options.log_level = SYSLOG_LEVEL_QUIET; | |
407 | break; | |
5260325f | 408 | case 'e': |
409 | if (optarg[0] == '^' && optarg[2] == 0 && | |
f5a1a01a | 410 | (u_char) optarg[1] >= 64 && |
411 | (u_char) optarg[1] < 128) | |
1e3b8b07 | 412 | options.escape_char = (u_char) optarg[1] & 31; |
5260325f | 413 | else if (strlen(optarg) == 1) |
1e3b8b07 | 414 | options.escape_char = (u_char) optarg[0]; |
5260325f | 415 | else if (strcmp(optarg, "none") == 0) |
4bf9c10e | 416 | options.escape_char = SSH_ESCAPECHAR_NONE; |
5260325f | 417 | else { |
f5a1a01a | 418 | fprintf(stderr, "Bad escape character '%s'.\n", |
419 | optarg); | |
5260325f | 420 | exit(1); |
421 | } | |
422 | break; | |
5260325f | 423 | case 'c': |
a306f2dd | 424 | if (ciphers_valid(optarg)) { |
425 | /* SSH2 only */ | |
426 | options.ciphers = xstrdup(optarg); | |
d0c832f3 | 427 | options.cipher = SSH_CIPHER_ILLEGAL; |
a306f2dd | 428 | } else { |
429 | /* SSH1 only */ | |
c523303b | 430 | options.cipher = cipher_number(optarg); |
431 | if (options.cipher == -1) { | |
f5a1a01a | 432 | fprintf(stderr, |
433 | "Unknown cipher type '%s'\n", | |
434 | optarg); | |
a306f2dd | 435 | exit(1); |
436 | } | |
f5a1a01a | 437 | if (options.cipher == SSH_CIPHER_3DES) |
c523303b | 438 | options.ciphers = "3des-cbc"; |
f5a1a01a | 439 | else if (options.cipher == SSH_CIPHER_BLOWFISH) |
c523303b | 440 | options.ciphers = "blowfish-cbc"; |
f5a1a01a | 441 | else |
c523303b | 442 | options.ciphers = (char *)-1; |
5260325f | 443 | } |
444 | break; | |
b2552997 | 445 | case 'm': |
446 | if (mac_valid(optarg)) | |
447 | options.macs = xstrdup(optarg); | |
448 | else { | |
f5a1a01a | 449 | fprintf(stderr, "Unknown mac type '%s'\n", |
450 | optarg); | |
b2552997 | 451 | exit(1); |
452 | } | |
453 | break; | |
5260325f | 454 | case 'p': |
2d2a2c65 | 455 | options.port = a2port(optarg); |
456 | if (options.port == 0) { | |
6031af8d | 457 | fprintf(stderr, "Bad port '%s'\n", optarg); |
458 | exit(1); | |
459 | } | |
5260325f | 460 | break; |
5260325f | 461 | case 'l': |
462 | options.user = optarg; | |
463 | break; | |
d2e3df16 | 464 | |
465 | case 'L': | |
5260325f | 466 | case 'R': |
d2e3df16 | 467 | if (sscanf(optarg, "%5[0-9]:%255[^:]:%5[0-9]", |
468 | sfwd_port, buf, sfwd_host_port) != 3 && | |
469 | sscanf(optarg, "%5[0-9]/%255[^/]/%5[0-9]", | |
470 | sfwd_port, buf, sfwd_host_port) != 3) { | |
f5a1a01a | 471 | fprintf(stderr, |
d2e3df16 | 472 | "Bad forwarding specification '%s'\n", |
f5a1a01a | 473 | optarg); |
5260325f | 474 | usage(); |
475 | /* NOTREACHED */ | |
476 | } | |
d2e3df16 | 477 | if ((fwd_port = a2port(sfwd_port)) == 0 || |
478 | (fwd_host_port = a2port(sfwd_host_port)) == 0) { | |
f5a1a01a | 479 | fprintf(stderr, |
d2e3df16 | 480 | "Bad forwarding port(s) '%s'\n", optarg); |
481 | exit(1); | |
5260325f | 482 | } |
d2e3df16 | 483 | if (opt == 'L') |
484 | add_local_forward(&options, fwd_port, buf, | |
485 | fwd_host_port); | |
486 | else if (opt == 'R') | |
487 | add_remote_forward(&options, fwd_port, buf, | |
184eed6a | 488 | fwd_host_port); |
5260325f | 489 | break; |
0490e609 | 490 | |
491 | case 'D': | |
2d2a2c65 | 492 | fwd_port = a2port(optarg); |
493 | if (fwd_port == 0) { | |
f5a1a01a | 494 | fprintf(stderr, "Bad dynamic port '%s'\n", |
495 | optarg); | |
6031af8d | 496 | exit(1); |
497 | } | |
0490e609 | 498 | add_local_forward(&options, fwd_port, "socks4", 0); |
499 | break; | |
500 | ||
5260325f | 501 | case 'C': |
502 | options.compression = 1; | |
503 | break; | |
8ce64345 | 504 | case 'N': |
505 | no_shell_flag = 1; | |
506 | no_tty_flag = 1; | |
507 | break; | |
8ce64345 | 508 | case 'T': |
509 | no_tty_flag = 1; | |
510 | break; | |
5260325f | 511 | case 'o': |
512 | dummy = 1; | |
f5a1a01a | 513 | if (process_config_line(&options, host ? host : "", |
514 | optarg, "command-line", 0, &dummy) != 0) | |
5260325f | 515 | exit(1); |
516 | break; | |
ae810de7 | 517 | case 's': |
518 | subsystem_flag = 1; | |
519 | break; | |
3435f5a6 | 520 | case 'b': |
521 | options.bind_address = optarg; | |
522 | break; | |
e591b98a | 523 | case 'F': |
524 | config = optarg; | |
525 | break; | |
5260325f | 526 | default: |
527 | usage(); | |
528 | } | |
529 | } | |
530 | ||
f5a1a01a | 531 | ac -= optind; |
532 | av += optind; | |
533 | ||
534 | if (ac > 0 && !host && **av != '-') { | |
535 | if (strchr(*av, '@')) { | |
536 | p = xstrdup(*av); | |
537 | cp = strchr(p, '@'); | |
538 | if (cp == NULL || cp == p) | |
539 | usage(); | |
540 | options.user = p; | |
541 | *cp = '\0'; | |
542 | host = ++cp; | |
543 | } else | |
544 | host = *av; | |
545 | ac--, av++; | |
546 | if (ac > 0) { | |
547 | optind = 0; | |
548 | optreset = 1; | |
549 | goto again; | |
550 | } | |
551 | } | |
552 | ||
5260325f | 553 | /* Check that we got a host name. */ |
554 | if (!host) | |
8efc0c15 | 555 | usage(); |
5260325f | 556 | |
22d89d24 | 557 | SSLeay_add_all_algorithms(); |
fa08c86b | 558 | ERR_load_crypto_strings(); |
5e4a7219 | 559 | channel_set_af(IPv4or6); |
22d89d24 | 560 | |
5260325f | 561 | /* Initialize the command to execute on remote host. */ |
562 | buffer_init(&command); | |
563 | ||
aa3378df | 564 | /* |
565 | * Save the command to execute on the remote host in a buffer. There | |
566 | * is no limit on the length of the command, except by the maximum | |
567 | * packet size. Also sets the tty flag if there is no command. | |
568 | */ | |
f5a1a01a | 569 | if (!ac) { |
5260325f | 570 | /* No command specified - execute shell on a tty. */ |
571 | tty_flag = 1; | |
ae810de7 | 572 | if (subsystem_flag) { |
f5a1a01a | 573 | fprintf(stderr, |
574 | "You must specify a subsystem to invoke.\n"); | |
ae810de7 | 575 | usage(); |
576 | } | |
5260325f | 577 | } else { |
f5a1a01a | 578 | /* A command has been specified. Store it into the buffer. */ |
579 | for (i = 0; i < ac; i++) { | |
580 | if (i) | |
5260325f | 581 | buffer_append(&command, " ", 1); |
582 | buffer_append(&command, av[i], strlen(av[i])); | |
583 | } | |
8efc0c15 | 584 | } |
5260325f | 585 | |
586 | /* Cannot fork to background if no command. */ | |
14a9a859 | 587 | if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag) |
5260325f | 588 | fatal("Cannot fork into background without a command to execute."); |
589 | ||
590 | /* Allocate a tty by default if no command specified. */ | |
591 | if (buffer_len(&command) == 0) | |
592 | tty_flag = 1; | |
593 | ||
0b6fbf03 | 594 | /* Force no tty*/ |
595 | if (no_tty_flag) | |
596 | tty_flag = 0; | |
5260325f | 597 | /* Do not allocate a tty if stdin is not a tty. */ |
8abcdba4 | 598 | if (!isatty(fileno(stdin)) && !force_tty_flag) { |
5260325f | 599 | if (tty_flag) |
54b974dc | 600 | log("Pseudo-terminal will not be allocated because stdin is not a terminal."); |
5260325f | 601 | tty_flag = 0; |
602 | } | |
8ce64345 | 603 | |
20244695 | 604 | /* |
605 | * Initialize "log" output. Since we are the client all output | |
606 | * actually goes to stderr. | |
607 | */ | |
cc44f691 | 608 | log_init(av[0], options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level, |
609 | SYSLOG_FACILITY_USER, 1); | |
5260325f | 610 | |
e591b98a | 611 | /* |
612 | * Read per-user configuration file. Ignore the system wide config | |
613 | * file if the user specifies a config file on the command line. | |
614 | */ | |
615 | if (config != NULL) { | |
93111dfa | 616 | if (!read_config_file(config, host, &options)) |
617 | fatal("Can't open user config file %.100s: " | |
618 | "%.100s", config, strerror(errno)); | |
e591b98a | 619 | } else { |
620 | snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, | |
621 | _PATH_SSH_USER_CONFFILE); | |
f67792f2 | 622 | (void)read_config_file(buf, host, &options); |
e591b98a | 623 | |
f67792f2 | 624 | /* Read systemwide configuration file after use config. */ |
93111dfa | 625 | (void)read_config_file(_PATH_HOST_CONFIG_FILE, host, &options); |
e591b98a | 626 | } |
5260325f | 627 | |
628 | /* Fill configuration defaults. */ | |
629 | fill_default_options(&options); | |
630 | ||
631 | /* reinit */ | |
20244695 | 632 | log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 1); |
5260325f | 633 | |
e339aa53 | 634 | seed_rng(); |
635 | ||
5260325f | 636 | if (options.user == NULL) |
637 | options.user = xstrdup(pw->pw_name); | |
638 | ||
639 | if (options.hostname != NULL) | |
640 | host = options.hostname; | |
641 | ||
5260325f | 642 | /* Disable rhosts authentication if not running as root. */ |
3c62e7eb | 643 | #ifdef HAVE_CYGWIN |
644 | /* Ignore uid if running under Windows */ | |
645 | if (!options.use_privileged_port) { | |
646 | #else | |
5260325f | 647 | if (original_effective_uid != 0 || !options.use_privileged_port) { |
3c62e7eb | 648 | #endif |
6ffc9c88 | 649 | debug("Rhosts Authentication disabled, " |
650 | "originating port will not be trusted."); | |
5260325f | 651 | options.rhosts_authentication = 0; |
5260325f | 652 | } |
aa3378df | 653 | /* |
654 | * If using rsh has been selected, exec it now (without trying | |
655 | * anything else). Note that we must release privileges first. | |
656 | */ | |
5260325f | 657 | if (options.use_rsh) { |
aa3378df | 658 | /* |
659 | * Restore our superuser privileges. This must be done | |
660 | * before permanently setting the uid. | |
661 | */ | |
5260325f | 662 | restore_uid(); |
663 | ||
664 | /* Switch to the original uid permanently. */ | |
63bd8c36 | 665 | permanently_set_uid(pw); |
5260325f | 666 | |
667 | /* Execute rsh. */ | |
668 | rsh_connect(host, options.user, &command); | |
669 | fatal("rsh_connect returned"); | |
8efc0c15 | 670 | } |
5260325f | 671 | /* Restore our superuser privileges. */ |
672 | restore_uid(); | |
673 | ||
6ffc9c88 | 674 | /* Open a connection to the remote host. */ |
5260325f | 675 | |
dab89049 | 676 | cerr = ssh_connect(host, &hostaddr, options.port, IPv4or6, |
6ffc9c88 | 677 | options.connection_attempts, |
678 | original_effective_uid != 0 || !options.use_privileged_port, | |
63bd8c36 | 679 | pw, options.proxy_command); |
5260325f | 680 | |
aa3378df | 681 | /* |
682 | * If we successfully made the connection, load the host private key | |
683 | * in case we will need it later for combined rsa-rhosts | |
684 | * authentication. This must be done before releasing extra | |
685 | * privileges, because the file is only readable by root. | |
686 | */ | |
8002af61 | 687 | sensitive_data.nkeys = 0; |
688 | sensitive_data.keys = NULL; | |
ce773142 | 689 | if (!cerr && (options.rhosts_rsa_authentication || |
8002af61 | 690 | options.hostbased_authentication)) { |
691 | sensitive_data.nkeys = 3; | |
692 | sensitive_data.keys = xmalloc(sensitive_data.nkeys*sizeof(Key)); | |
693 | sensitive_data.keys[0] = key_load_private_type(KEY_RSA1, | |
aeaa3d9e | 694 | _PATH_HOST_KEY_FILE, "", NULL); |
8002af61 | 695 | sensitive_data.keys[1] = key_load_private_type(KEY_DSA, |
696 | _PATH_HOST_DSA_KEY_FILE, "", NULL); | |
697 | sensitive_data.keys[2] = key_load_private_type(KEY_RSA, | |
698 | _PATH_HOST_RSA_KEY_FILE, "", NULL); | |
5260325f | 699 | } |
aa3378df | 700 | /* |
701 | * Get rid of any extra privileges that we may have. We will no | |
702 | * longer need them. Also, extra privileges could make it very hard | |
703 | * to read identity files and other non-world-readable files from the | |
704 | * user's home directory if it happens to be on a NFS volume where | |
705 | * root is mapped to nobody. | |
706 | */ | |
707 | ||
708 | /* | |
709 | * Note that some legacy systems need to postpone the following call | |
710 | * to permanently_set_uid() until the private hostkey is destroyed | |
711 | * with RSA_free(). Otherwise the calling user could ptrace() the | |
712 | * process, read the private hostkey and impersonate the host. | |
713 | * OpenBSD does not allow ptracing of setuid processes. | |
714 | */ | |
63bd8c36 | 715 | permanently_set_uid(pw); |
5260325f | 716 | |
aa3378df | 717 | /* |
718 | * Now that we are back to our own permissions, create ~/.ssh | |
719 | * directory if it doesn\'t already exist. | |
720 | */ | |
c3abff07 | 721 | snprintf(buf, sizeof buf, "%.100s%s%.100s", pw->pw_dir, strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR); |
5260325f | 722 | if (stat(buf, &st) < 0) |
704b1659 | 723 | if (mkdir(buf, 0700) < 0) |
5260325f | 724 | error("Could not create directory '%.200s'.", buf); |
725 | ||
726 | /* Check if the connection failed, and try "rsh" if appropriate. */ | |
ce773142 | 727 | if (cerr) { |
728 | if (!options.fallback_to_rsh) | |
729 | exit(1); | |
5260325f | 730 | if (options.port != 0) |
ce773142 | 731 | log("Secure connection to %.100s on port %hu refused; " |
732 | "reverting to insecure method", | |
733 | host, options.port); | |
5260325f | 734 | else |
ce773142 | 735 | log("Secure connection to %.100s refused; " |
736 | "reverting to insecure method.", host); | |
5260325f | 737 | |
ce773142 | 738 | rsh_connect(host, options.user, &command); |
739 | fatal("rsh_connect returned"); | |
8efc0c15 | 740 | } |
fee56204 | 741 | /* load options.identity_files */ |
742 | load_public_identity_files(); | |
743 | ||
744 | /* Expand ~ in known host file names. */ | |
745 | /* XXX mem-leaks: */ | |
fa08c86b | 746 | options.system_hostfile = |
747 | tilde_expand_filename(options.system_hostfile, original_real_uid); | |
748 | options.user_hostfile = | |
749 | tilde_expand_filename(options.user_hostfile, original_real_uid); | |
750 | options.system_hostfile2 = | |
751 | tilde_expand_filename(options.system_hostfile2, original_real_uid); | |
752 | options.user_hostfile2 = | |
753 | tilde_expand_filename(options.user_hostfile2, original_real_uid); | |
5260325f | 754 | |
67b75437 | 755 | signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */ |
756 | ||
5260325f | 757 | /* Log into the remote system. This never returns if the login fails. */ |
8002af61 | 758 | ssh_login(sensitive_data.keys, sensitive_data.nkeys, |
759 | host, (struct sockaddr *)&hostaddr, pw); | |
760 | ||
761 | /* We no longer need the private host keys. Clear them now. */ | |
762 | if (sensitive_data.nkeys != 0) { | |
763 | for (i = 0; i < sensitive_data.nkeys; i++) { | |
764 | if (sensitive_data.keys[i] != NULL) { | |
765 | /* Destroys contents safely */ | |
766 | debug3("clear hostkey %d", i); | |
767 | key_free(sensitive_data.keys[i]); | |
768 | sensitive_data.keys[i] = NULL; | |
769 | } | |
770 | } | |
771 | xfree(sensitive_data.keys); | |
772 | } | |
05b7537a | 773 | for (i = 0; i < options.num_identity_files; i++) { |
774 | if (options.identity_files[i]) { | |
775 | xfree(options.identity_files[i]); | |
776 | options.identity_files[i] = NULL; | |
777 | } | |
778 | if (options.identity_keys[i]) { | |
779 | key_free(options.identity_keys[i]); | |
780 | options.identity_keys[i] = NULL; | |
781 | } | |
782 | } | |
5260325f | 783 | |
8ce64345 | 784 | exit_status = compat20 ? ssh_session2() : ssh_session(); |
785 | packet_close(); | |
786 | return exit_status; | |
787 | } | |
788 | ||
396c147e | 789 | static void |
b48eeb07 | 790 | x11_get_proto(char **_proto, char **_data) |
0b242b12 | 791 | { |
792 | char line[512]; | |
b48eeb07 | 793 | static char proto[512], data[512]; |
0b242b12 | 794 | FILE *f; |
795 | int got_data = 0, i; | |
75a624f0 | 796 | char *display; |
0b242b12 | 797 | |
b48eeb07 | 798 | *_proto = proto; |
799 | *_data = data; | |
800 | proto[0] = data[0] = '\0'; | |
75a624f0 | 801 | if (options.xauth_location && (display = getenv("DISPLAY"))) { |
fa649821 | 802 | /* Try to get Xauthority information for the display. */ |
75a624f0 | 803 | if (strncmp(display, "localhost:", 10) == 0) |
804 | /* | |
805 | * Handle FamilyLocal case where $DISPLAY does | |
806 | * not match an authorization entry. For this we | |
807 | * just try "xauth list unix:displaynum.screennum". | |
808 | * XXX: "localhost" match to determine FamilyLocal | |
809 | * is not perfect. | |
810 | */ | |
811 | snprintf(line, sizeof line, "%.100s list unix:%s 2>" | |
812 | _PATH_DEVNULL, options.xauth_location, display+10); | |
813 | else | |
814 | snprintf(line, sizeof line, "%.100s list %.200s 2>" | |
815 | _PATH_DEVNULL, options.xauth_location, display); | |
816 | debug2("x11_get_proto %s", line); | |
fa649821 | 817 | f = popen(line, "r"); |
818 | if (f && fgets(line, sizeof(line), f) && | |
b48eeb07 | 819 | sscanf(line, "%*s %511s %511s", proto, data) == 2) |
fa649821 | 820 | got_data = 1; |
821 | if (f) | |
822 | pclose(f); | |
823 | } | |
0b242b12 | 824 | /* |
825 | * If we didn't get authentication data, just make up some | |
826 | * data. The forwarding code will check the validity of the | |
827 | * response anyway, and substitute this data. The X11 | |
828 | * server, however, will ignore this fake data and use | |
829 | * whatever authentication mechanisms it was using otherwise | |
830 | * for the local connection. | |
831 | */ | |
832 | if (!got_data) { | |
833 | u_int32_t rand = 0; | |
834 | ||
b48eeb07 | 835 | strlcpy(proto, "MIT-MAGIC-COOKIE-1", sizeof proto); |
0b242b12 | 836 | for (i = 0; i < 16; i++) { |
837 | if (i % 4 == 0) | |
838 | rand = arc4random(); | |
b48eeb07 | 839 | snprintf(data + 2 * i, sizeof data - 2 * i, "%02x", rand & 0xff); |
0b242b12 | 840 | rand >>= 8; |
841 | } | |
842 | } | |
843 | } | |
844 | ||
396c147e | 845 | static void |
fa08c86b | 846 | ssh_init_forwarding(void) |
847 | { | |
02a024dd | 848 | int success = 0; |
fa08c86b | 849 | int i; |
02a024dd | 850 | |
fa08c86b | 851 | /* Initiate local TCP/IP port forwardings. */ |
852 | for (i = 0; i < options.num_local_forwards; i++) { | |
853 | debug("Connections to local port %d forwarded to remote address %.200s:%d", | |
854 | options.local_forwards[i].port, | |
855 | options.local_forwards[i].host, | |
856 | options.local_forwards[i].host_port); | |
5641aefa | 857 | success += channel_setup_local_fwd_listener( |
fa08c86b | 858 | options.local_forwards[i].port, |
859 | options.local_forwards[i].host, | |
860 | options.local_forwards[i].host_port, | |
861 | options.gateway_ports); | |
862 | } | |
02a024dd | 863 | if (i > 0 && success == 0) |
864 | error("Could not request local forwarding."); | |
fa08c86b | 865 | |
866 | /* Initiate remote TCP/IP port forwardings. */ | |
867 | for (i = 0; i < options.num_remote_forwards; i++) { | |
868 | debug("Connections to remote port %d forwarded to local address %.200s:%d", | |
869 | options.remote_forwards[i].port, | |
870 | options.remote_forwards[i].host, | |
871 | options.remote_forwards[i].host_port); | |
872 | channel_request_remote_forwarding( | |
873 | options.remote_forwards[i].port, | |
874 | options.remote_forwards[i].host, | |
875 | options.remote_forwards[i].host_port); | |
876 | } | |
877 | } | |
878 | ||
396c147e | 879 | static void |
fa08c86b | 880 | check_agent_present(void) |
881 | { | |
882 | if (options.forward_agent) { | |
883 | /* Clear agent forwarding if we don\'t have an agent. */ | |
884 | int authfd = ssh_get_authentication_socket(); | |
885 | if (authfd < 0) | |
886 | options.forward_agent = 0; | |
887 | else | |
888 | ssh_close_authentication_socket(authfd); | |
889 | } | |
890 | } | |
891 | ||
396c147e | 892 | static int |
8ce64345 | 893 | ssh_session(void) |
894 | { | |
895 | int type; | |
8ce64345 | 896 | int interactive = 0; |
897 | int have_tty = 0; | |
898 | struct winsize ws; | |
8ce64345 | 899 | char *cp; |
900 | ||
5260325f | 901 | /* Enable compression if requested. */ |
902 | if (options.compression) { | |
903 | debug("Requesting compression at level %d.", options.compression_level); | |
904 | ||
905 | if (options.compression_level < 1 || options.compression_level > 9) | |
906 | fatal("Compression level must be from 1 (fast) to 9 (slow, best)."); | |
907 | ||
908 | /* Send the request. */ | |
909 | packet_start(SSH_CMSG_REQUEST_COMPRESSION); | |
910 | packet_put_int(options.compression_level); | |
911 | packet_send(); | |
912 | packet_write_wait(); | |
54a5250f | 913 | type = packet_read(); |
5260325f | 914 | if (type == SSH_SMSG_SUCCESS) |
915 | packet_start_compression(options.compression_level); | |
916 | else if (type == SSH_SMSG_FAILURE) | |
917 | log("Warning: Remote host refused compression."); | |
918 | else | |
919 | packet_disconnect("Protocol error waiting for compression response."); | |
920 | } | |
921 | /* Allocate a pseudo tty if appropriate. */ | |
922 | if (tty_flag) { | |
923 | debug("Requesting pty."); | |
924 | ||
925 | /* Start the packet. */ | |
926 | packet_start(SSH_CMSG_REQUEST_PTY); | |
927 | ||
928 | /* Store TERM in the packet. There is no limit on the | |
929 | length of the string. */ | |
930 | cp = getenv("TERM"); | |
931 | if (!cp) | |
932 | cp = ""; | |
449c5ba5 | 933 | packet_put_cstring(cp); |
5260325f | 934 | |
935 | /* Store window size in the packet. */ | |
936 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) | |
937 | memset(&ws, 0, sizeof(ws)); | |
938 | packet_put_int(ws.ws_row); | |
939 | packet_put_int(ws.ws_col); | |
940 | packet_put_int(ws.ws_xpixel); | |
941 | packet_put_int(ws.ws_ypixel); | |
942 | ||
943 | /* Store tty modes in the packet. */ | |
30dcc918 | 944 | tty_make_modes(fileno(stdin), NULL); |
5260325f | 945 | |
946 | /* Send the packet, and wait for it to leave. */ | |
947 | packet_send(); | |
948 | packet_write_wait(); | |
949 | ||
950 | /* Read response from the server. */ | |
54a5250f | 951 | type = packet_read(); |
4fe2af09 | 952 | if (type == SSH_SMSG_SUCCESS) { |
5260325f | 953 | interactive = 1; |
8ce64345 | 954 | have_tty = 1; |
4fe2af09 | 955 | } else if (type == SSH_SMSG_FAILURE) |
5260325f | 956 | log("Warning: Remote host failed or refused to allocate a pseudo tty."); |
957 | else | |
958 | packet_disconnect("Protocol error waiting for pty request response."); | |
959 | } | |
960 | /* Request X11 forwarding if enabled and DISPLAY is set. */ | |
961 | if (options.forward_x11 && getenv("DISPLAY") != NULL) { | |
b48eeb07 | 962 | char *proto, *data; |
0b242b12 | 963 | /* Get reasonable local authentication information. */ |
b48eeb07 | 964 | x11_get_proto(&proto, &data); |
0b242b12 | 965 | /* Request forwarding with authentication spoofing. */ |
5260325f | 966 | debug("Requesting X11 forwarding with authentication spoofing."); |
0b242b12 | 967 | x11_request_forwarding_with_spoofing(0, proto, data); |
5260325f | 968 | |
969 | /* Read response from the server. */ | |
54a5250f | 970 | type = packet_read(); |
5260325f | 971 | if (type == SSH_SMSG_SUCCESS) { |
5260325f | 972 | interactive = 1; |
0b242b12 | 973 | } else if (type == SSH_SMSG_FAILURE) { |
5260325f | 974 | log("Warning: Remote host denied X11 forwarding."); |
0b242b12 | 975 | } else { |
5260325f | 976 | packet_disconnect("Protocol error waiting for X11 forwarding"); |
0b242b12 | 977 | } |
5260325f | 978 | } |
979 | /* Tell the packet module whether this is an interactive session. */ | |
b5c334cc | 980 | packet_set_interactive(interactive); |
5260325f | 981 | |
982 | /* Request authentication agent forwarding if appropriate. */ | |
fa08c86b | 983 | check_agent_present(); |
984 | ||
5260325f | 985 | if (options.forward_agent) { |
986 | debug("Requesting authentication agent forwarding."); | |
987 | auth_request_forwarding(); | |
988 | ||
989 | /* Read response from the server. */ | |
54a5250f | 990 | type = packet_read(); |
95500969 | 991 | packet_check_eom(); |
5260325f | 992 | if (type != SSH_SMSG_SUCCESS) |
993 | log("Warning: Remote host denied authentication agent forwarding."); | |
994 | } | |
8efc0c15 | 995 | |
fa08c86b | 996 | /* Initiate port forwardings. */ |
997 | ssh_init_forwarding(); | |
5260325f | 998 | |
aa3378df | 999 | /* If requested, let ssh continue in the background. */ |
6ae2364d | 1000 | if (fork_after_authentication_flag) |
aa3378df | 1001 | if (daemon(1, 1) < 0) |
1002 | fatal("daemon() failed: %.200s", strerror(errno)); | |
1003 | ||
1004 | /* | |
1005 | * If a command was specified on the command line, execute the | |
1006 | * command now. Otherwise request the server to start a shell. | |
1007 | */ | |
5260325f | 1008 | if (buffer_len(&command) > 0) { |
1009 | int len = buffer_len(&command); | |
1010 | if (len > 900) | |
1011 | len = 900; | |
6c0fa2b1 | 1012 | debug("Sending command: %.*s", len, (u_char *)buffer_ptr(&command)); |
5260325f | 1013 | packet_start(SSH_CMSG_EXEC_CMD); |
1014 | packet_put_string(buffer_ptr(&command), buffer_len(&command)); | |
1015 | packet_send(); | |
1016 | packet_write_wait(); | |
1017 | } else { | |
1018 | debug("Requesting shell."); | |
1019 | packet_start(SSH_CMSG_EXEC_SHELL); | |
1020 | packet_send(); | |
1021 | packet_write_wait(); | |
1022 | } | |
1023 | ||
1024 | /* Enter the interactive session. */ | |
4bf9c10e | 1025 | return client_loop(have_tty, tty_flag ? |
1026 | options.escape_char : SSH_ESCAPECHAR_NONE, 0); | |
8ce64345 | 1027 | } |
5260325f | 1028 | |
396c147e | 1029 | static void |
7819b5c3 | 1030 | client_subsystem_reply(int type, u_int32_t seq, void *ctxt) |
1f3bf5aa | 1031 | { |
1032 | int id, len; | |
1033 | ||
1034 | id = packet_get_int(); | |
1035 | len = buffer_len(&command); | |
ce91d6f8 | 1036 | if (len > 900) |
1037 | len = 900; | |
95500969 | 1038 | packet_check_eom(); |
1f3bf5aa | 1039 | if (type == SSH2_MSG_CHANNEL_FAILURE) |
1040 | fatal("Request for subsystem '%.*s' failed on channel %d", | |
6c0fa2b1 | 1041 | len, (u_char *)buffer_ptr(&command), id); |
1f3bf5aa | 1042 | } |
1043 | ||
bcdb96c2 | 1044 | /* request pty/x11/agent/tcpfwd/shell for channel */ |
396c147e | 1045 | static void |
bcdb96c2 | 1046 | ssh_session2_setup(int id, void *arg) |
8ce64345 | 1047 | { |
1048 | int len; | |
b5c334cc | 1049 | int interactive = 0; |
30dcc918 | 1050 | struct termios tio; |
b5c334cc | 1051 | |
bcdb96c2 | 1052 | debug("ssh_session2_setup: id %d", id); |
8ce64345 | 1053 | |
8ce64345 | 1054 | if (tty_flag) { |
1055 | struct winsize ws; | |
1056 | char *cp; | |
1057 | cp = getenv("TERM"); | |
1058 | if (!cp) | |
1059 | cp = ""; | |
1060 | /* Store window size in the packet. */ | |
1061 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) | |
1062 | memset(&ws, 0, sizeof(ws)); | |
1063 | ||
1064 | channel_request_start(id, "pty-req", 0); | |
1065 | packet_put_cstring(cp); | |
1066 | packet_put_int(ws.ws_col); | |
1067 | packet_put_int(ws.ws_row); | |
1068 | packet_put_int(ws.ws_xpixel); | |
1069 | packet_put_int(ws.ws_ypixel); | |
30dcc918 | 1070 | tio = get_saved_tio(); |
1071 | tty_make_modes(/*ignored*/ 0, &tio); | |
8ce64345 | 1072 | packet_send(); |
b5c334cc | 1073 | interactive = 1; |
8ce64345 | 1074 | /* XXX wait for reply */ |
1075 | } | |
0b242b12 | 1076 | if (options.forward_x11 && |
1077 | getenv("DISPLAY") != NULL) { | |
b48eeb07 | 1078 | char *proto, *data; |
0b242b12 | 1079 | /* Get reasonable local authentication information. */ |
b48eeb07 | 1080 | x11_get_proto(&proto, &data); |
0b242b12 | 1081 | /* Request forwarding with authentication spoofing. */ |
1082 | debug("Requesting X11 forwarding with authentication spoofing."); | |
1083 | x11_request_forwarding_with_spoofing(id, proto, data); | |
b5c334cc | 1084 | interactive = 1; |
0b242b12 | 1085 | /* XXX wait for reply */ |
1086 | } | |
1087 | ||
fa08c86b | 1088 | check_agent_present(); |
1089 | if (options.forward_agent) { | |
1090 | debug("Requesting authentication agent forwarding."); | |
1091 | channel_request_start(id, "auth-agent-req@openssh.com", 0); | |
1092 | packet_send(); | |
1093 | } | |
1094 | ||
8ce64345 | 1095 | len = buffer_len(&command); |
1096 | if (len > 0) { | |
1097 | if (len > 900) | |
1098 | len = 900; | |
ae810de7 | 1099 | if (subsystem_flag) { |
6c0fa2b1 | 1100 | debug("Sending subsystem: %.*s", len, (u_char *)buffer_ptr(&command)); |
1f3bf5aa | 1101 | channel_request_start(id, "subsystem", /*want reply*/ 1); |
1102 | /* register callback for reply */ | |
1103 | /* XXX we asume that client_loop has already been called */ | |
1104 | dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &client_subsystem_reply); | |
1105 | dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &client_subsystem_reply); | |
ae810de7 | 1106 | } else { |
6c0fa2b1 | 1107 | debug("Sending command: %.*s", len, (u_char *)buffer_ptr(&command)); |
ae810de7 | 1108 | channel_request_start(id, "exec", 0); |
1109 | } | |
ce91d6f8 | 1110 | packet_put_string(buffer_ptr(&command), buffer_len(&command)); |
8ce64345 | 1111 | packet_send(); |
1112 | } else { | |
06ee33fb | 1113 | channel_request_start(id, "shell", 0); |
1114 | packet_send(); | |
8ce64345 | 1115 | } |
1116 | /* channel_callback(id, SSH2_MSG_OPEN_CONFIGMATION, client_init, 0); */ | |
1f3bf5aa | 1117 | |
8ce64345 | 1118 | /* register different callback, etc. XXX */ |
b5c334cc | 1119 | packet_set_interactive(interactive); |
8ce64345 | 1120 | } |
1121 | ||
bcdb96c2 | 1122 | /* open new channel for a session */ |
396c147e | 1123 | static int |
bcdb96c2 | 1124 | ssh_session2_open(void) |
8ce64345 | 1125 | { |
719fc62f | 1126 | Channel *c; |
1127 | int window, packetmax, in, out, err; | |
2e73a022 | 1128 | |
14a9a859 | 1129 | if (stdin_null_flag) { |
5ca51e19 | 1130 | in = open(_PATH_DEVNULL, O_RDONLY); |
14a9a859 | 1131 | } else { |
1132 | in = dup(STDIN_FILENO); | |
1133 | } | |
2e73a022 | 1134 | out = dup(STDOUT_FILENO); |
1135 | err = dup(STDERR_FILENO); | |
8ce64345 | 1136 | |
1137 | if (in < 0 || out < 0 || err < 0) | |
14a9a859 | 1138 | fatal("dup() in/out/err failed"); |
8ce64345 | 1139 | |
a22aff1f | 1140 | /* enable nonblocking unless tty */ |
1141 | if (!isatty(in)) | |
1142 | set_nonblock(in); | |
1143 | if (!isatty(out)) | |
1144 | set_nonblock(out); | |
1145 | if (!isatty(err)) | |
1146 | set_nonblock(err); | |
1147 | ||
bcbf86ec | 1148 | window = CHAN_SES_WINDOW_DEFAULT; |
1149 | packetmax = CHAN_SES_PACKET_DEFAULT; | |
1150 | if (!tty_flag) { | |
8ce64345 | 1151 | window *= 2; |
bcbf86ec | 1152 | packetmax *=2; |
8ce64345 | 1153 | } |
719fc62f | 1154 | c = channel_new( |
8ce64345 | 1155 | "session", SSH_CHANNEL_OPENING, in, out, err, |
bcbf86ec | 1156 | window, packetmax, CHAN_EXTENDED_WRITE, |
a22aff1f | 1157 | xstrdup("client-session"), /*nonblock*/0); |
8ce64345 | 1158 | |
bcdb96c2 | 1159 | debug3("ssh_session2_open: channel_new: %d", c->self); |
eb0dd41f | 1160 | |
36e1f6a1 | 1161 | channel_send_open(c->self); |
bcdb96c2 | 1162 | if (!no_shell_flag) |
05ca0898 | 1163 | channel_register_confirm(c->self, ssh_session2_setup); |
5260325f | 1164 | |
719fc62f | 1165 | return c->self; |
eb0dd41f | 1166 | } |
1167 | ||
396c147e | 1168 | static int |
eb0dd41f | 1169 | ssh_session2(void) |
1170 | { | |
bcdb96c2 | 1171 | int id = -1; |
eb0dd41f | 1172 | |
1173 | /* XXX should be pre-session */ | |
1174 | ssh_init_forwarding(); | |
1175 | ||
bcdb96c2 | 1176 | if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN)) |
1177 | id = ssh_session2_open(); | |
eb0dd41f | 1178 | |
1179 | /* If requested, let ssh continue in the background. */ | |
1180 | if (fork_after_authentication_flag) | |
1181 | if (daemon(1, 1) < 0) | |
1182 | fatal("daemon() failed: %.200s", strerror(errno)); | |
1183 | ||
4bf9c10e | 1184 | return client_loop(tty_flag, tty_flag ? |
1185 | options.escape_char : SSH_ESCAPECHAR_NONE, id); | |
8efc0c15 | 1186 | } |
fa08c86b | 1187 | |
396c147e | 1188 | static void |
fee56204 | 1189 | load_public_identity_files(void) |
1190 | { | |
1191 | char *filename; | |
1192 | Key *public; | |
2e23cde0 | 1193 | int i = 0; |
fee56204 | 1194 | |
383546c4 | 1195 | #ifdef SMARTCARD |
9ff6f66f | 1196 | if (options.smartcard_device != NULL && |
383546c4 | 1197 | options.num_identity_files + 1 < SSH_MAX_IDENTITY_FILES && |
eea098a3 | 1198 | (public = sc_get_key(options.smartcard_device)) != NULL ) { |
383546c4 | 1199 | Key *new; |
1200 | ||
2e23cde0 | 1201 | if (options.num_identity_files + 2 > SSH_MAX_IDENTITY_FILES) |
1202 | options.num_identity_files = SSH_MAX_IDENTITY_FILES - 2; | |
1203 | memmove(&options.identity_files[2], &options.identity_files[0], | |
1204 | sizeof(char *) * options.num_identity_files); | |
1205 | options.num_identity_files += 2; | |
1206 | i = 2; | |
1207 | ||
383546c4 | 1208 | /* XXX ssh1 vs ssh2 */ |
1209 | new = key_new(KEY_RSA); | |
1210 | new->flags = KEY_FLAG_EXT; | |
1211 | BN_copy(new->rsa->n, public->rsa->n); | |
1212 | BN_copy(new->rsa->e, public->rsa->e); | |
1213 | RSA_set_method(new->rsa, sc_get_engine()); | |
2e23cde0 | 1214 | options.identity_keys[0] = new; |
1215 | options.identity_files[0] = xstrdup("smartcard rsa key");; | |
383546c4 | 1216 | |
1217 | new = key_new(KEY_RSA1); | |
1218 | new->flags = KEY_FLAG_EXT; | |
1219 | BN_copy(new->rsa->n, public->rsa->n); | |
1220 | BN_copy(new->rsa->e, public->rsa->e); | |
1221 | RSA_set_method(new->rsa, sc_get_engine()); | |
2e23cde0 | 1222 | options.identity_keys[1] = new; |
1223 | options.identity_files[1] = xstrdup("smartcard rsa1 key"); | |
383546c4 | 1224 | |
1225 | key_free(public); | |
1226 | } | |
3e984472 | 1227 | #endif /* SMARTCARD */ |
2e23cde0 | 1228 | for (; i < options.num_identity_files; i++) { |
1229 | filename = tilde_expand_filename(options.identity_files[i], | |
1230 | original_real_uid); | |
1231 | public = key_load_public(filename, NULL); | |
1232 | debug("identity file %s type %d", filename, | |
1233 | public ? public->type : -1); | |
1234 | xfree(options.identity_files[i]); | |
1235 | options.identity_files[i] = filename; | |
1236 | options.identity_keys[i] = public; | |
1237 | } | |
fee56204 | 1238 | } |