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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" | |
bcdb96c2 | 42 | RCSID("$OpenBSD: ssh.c,v 1.143 2001/09/20 13:50:40 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 | |
aa3378df | 134 | /* |
135 | * Flag to indicate that we have received a window change signal which has | |
136 | * not yet been processed. This will cause a message indicating the new | |
137 | * window size to be sent to the server a little later. This is volatile | |
138 | * because this is updated in a signal handler. | |
139 | */ | |
8efc0c15 | 140 | volatile int received_window_change_signal = 0; |
141 | ||
8002af61 | 142 | /* Private host keys. */ |
143 | struct { | |
144 | Key **keys; | |
145 | int nkeys; | |
146 | } sensitive_data; | |
8efc0c15 | 147 | |
148 | /* Original real UID. */ | |
149 | uid_t original_real_uid; | |
150 | ||
8ce64345 | 151 | /* command to be executed */ |
152 | Buffer command; | |
153 | ||
ae810de7 | 154 | /* Should we execute a command or invoke a subsystem? */ |
155 | int subsystem_flag = 0; | |
156 | ||
8efc0c15 | 157 | /* Prints a help message to the user. This function never returns. */ |
158 | ||
396c147e | 159 | static void |
5ca51e19 | 160 | usage(void) |
8efc0c15 | 161 | { |
1fe6a48f | 162 | fprintf(stderr, "Usage: %s [options] host [command]\n", __progname); |
5260325f | 163 | fprintf(stderr, "Options:\n"); |
164 | fprintf(stderr, " -l user Log in using this user name.\n"); | |
5ca51e19 | 165 | fprintf(stderr, " -n Redirect input from " _PATH_DEVNULL ".\n"); |
e591b98a | 166 | fprintf(stderr, " -F config Config file (default: ~/%s).\n", |
167 | _PATH_SSH_USER_CONFFILE); | |
71276795 | 168 | fprintf(stderr, " -A Enable authentication agent forwarding.\n"); |
63cd7dd0 | 169 | fprintf(stderr, " -a Disable authentication agent forwarding (default).\n"); |
8efc0c15 | 170 | #ifdef AFS |
5260325f | 171 | fprintf(stderr, " -k Disable Kerberos ticket and AFS token forwarding.\n"); |
172 | #endif /* AFS */ | |
2b87da3b | 173 | fprintf(stderr, " -X Enable X11 connection forwarding.\n"); |
63cd7dd0 | 174 | fprintf(stderr, " -x Disable X11 connection forwarding (default).\n"); |
a01a5f30 | 175 | fprintf(stderr, " -i file Identity for public key authentication " |
176 | "(default: ~/.ssh/identity)\n"); | |
315dfb04 | 177 | #ifdef SMARTCARD |
178 | fprintf(stderr, " -I reader Set smartcard reader.\n"); | |
dd2495cb | 179 | #endif |
5260325f | 180 | fprintf(stderr, " -t Tty; allocate a tty even if command is given.\n"); |
8ce64345 | 181 | fprintf(stderr, " -T Do not allocate a tty.\n"); |
5260325f | 182 | fprintf(stderr, " -v Verbose; display verbose debugging messages.\n"); |
bcbf86ec | 183 | fprintf(stderr, " Multiple -v increases verbosity.\n"); |
5260325f | 184 | fprintf(stderr, " -V Display version number only.\n"); |
185 | fprintf(stderr, " -P Don't allocate a privileged port.\n"); | |
186 | fprintf(stderr, " -q Quiet; don't display any warning messages.\n"); | |
187 | fprintf(stderr, " -f Fork into background after authentication.\n"); | |
188 | fprintf(stderr, " -e char Set escape character; ``none'' = disable (default: ~).\n"); | |
189 | ||
63cd7dd0 | 190 | fprintf(stderr, " -c cipher Select encryption algorithm\n"); |
38967add | 191 | fprintf(stderr, " -m macs Specify MAC algorithms for protocol version 2.\n"); |
5260325f | 192 | fprintf(stderr, " -p port Connect to this port. Server must be on the same port.\n"); |
193 | fprintf(stderr, " -L listen-port:host:port Forward local port to remote address\n"); | |
194 | fprintf(stderr, " -R listen-port:host:port Forward remote port to local address\n"); | |
1fe6a48f | 195 | fprintf(stderr, " These cause %s to listen for connections on a port, and\n", __progname); |
5260325f | 196 | fprintf(stderr, " forward them to the other side by connecting to host:port.\n"); |
4c780c2a | 197 | fprintf(stderr, " -D port Enable dynamic application-level port forwarding.\n"); |
5260325f | 198 | fprintf(stderr, " -C Enable compression.\n"); |
8ce64345 | 199 | fprintf(stderr, " -N Do not execute a shell or command.\n"); |
5260325f | 200 | fprintf(stderr, " -g Allow remote hosts to connect to forwarded ports.\n"); |
1f3bf5aa | 201 | fprintf(stderr, " -1 Force protocol version 1.\n"); |
202 | fprintf(stderr, " -2 Force protocol version 2.\n"); | |
48e671d5 | 203 | fprintf(stderr, " -4 Use IPv4 only.\n"); |
204 | fprintf(stderr, " -6 Use IPv6 only.\n"); | |
5260325f | 205 | fprintf(stderr, " -o 'option' Process the option as if it was read from a configuration file.\n"); |
ae810de7 | 206 | fprintf(stderr, " -s Invoke command (mandatory) as SSH2 subsystem.\n"); |
63cd7dd0 | 207 | fprintf(stderr, " -b addr Local IP address.\n"); |
5260325f | 208 | exit(1); |
8efc0c15 | 209 | } |
210 | ||
5260325f | 211 | /* |
212 | * Connects to the given host using rsh (or prints an error message and exits | |
213 | * if rsh is not available). This function never returns. | |
214 | */ | |
396c147e | 215 | static void |
5260325f | 216 | rsh_connect(char *host, char *user, Buffer * command) |
8efc0c15 | 217 | { |
5260325f | 218 | char *args[10]; |
219 | int i; | |
220 | ||
221 | log("Using rsh. WARNING: Connection will not be encrypted."); | |
222 | /* Build argument list for rsh. */ | |
223 | i = 0; | |
224 | args[i++] = _PATH_RSH; | |
225 | /* host may have to come after user on some systems */ | |
226 | args[i++] = host; | |
227 | if (user) { | |
228 | args[i++] = "-l"; | |
229 | args[i++] = user; | |
230 | } | |
231 | if (buffer_len(command) > 0) { | |
232 | buffer_append(command, "\0", 1); | |
233 | args[i++] = buffer_ptr(command); | |
234 | } | |
235 | args[i++] = NULL; | |
236 | if (debug_flag) { | |
237 | for (i = 0; args[i]; i++) { | |
238 | if (i != 0) | |
239 | fprintf(stderr, " "); | |
240 | fprintf(stderr, "%s", args[i]); | |
241 | } | |
242 | fprintf(stderr, "\n"); | |
8efc0c15 | 243 | } |
5260325f | 244 | execv(_PATH_RSH, args); |
245 | perror(_PATH_RSH); | |
246 | exit(1); | |
8efc0c15 | 247 | } |
248 | ||
396c147e | 249 | static int ssh_session(void); |
250 | static int ssh_session2(void); | |
251 | static void load_public_identity_files(void); | |
8ce64345 | 252 | |
5260325f | 253 | /* |
254 | * Main program for the ssh client. | |
255 | */ | |
8efc0c15 | 256 | int |
257 | main(int ac, char **av) | |
258 | { | |
ce773142 | 259 | int i, opt, exit_status, cerr; |
57112b5a | 260 | u_short fwd_port, fwd_host_port; |
d2e3df16 | 261 | char sfwd_port[6], sfwd_host_port[6]; |
f5a1a01a | 262 | char *p, *cp, buf[256]; |
5260325f | 263 | struct stat st; |
3b1a83df | 264 | struct passwd *pw; |
8ce64345 | 265 | int dummy; |
5260325f | 266 | uid_t original_effective_uid; |
1812a662 | 267 | extern int optopt; |
268 | extern int optind; | |
269 | extern int optreset; | |
270 | extern char *optarg; | |
5260325f | 271 | |
260d427b | 272 | __progname = get_progname(av[0]); |
264dce47 | 273 | init_rng(); |
274 | ||
aa3378df | 275 | /* |
276 | * Save the original real uid. It will be needed later (uid-swapping | |
277 | * may clobber the real uid). | |
278 | */ | |
5260325f | 279 | original_real_uid = getuid(); |
280 | original_effective_uid = geteuid(); | |
281 | ||
7322ef0e | 282 | #ifdef HAVE_SETRLIMIT |
5260325f | 283 | /* If we are installed setuid root be careful to not drop core. */ |
284 | if (original_real_uid != original_effective_uid) { | |
285 | struct rlimit rlim; | |
286 | rlim.rlim_cur = rlim.rlim_max = 0; | |
287 | if (setrlimit(RLIMIT_CORE, &rlim) < 0) | |
288 | fatal("setrlimit failed: %.100s", strerror(errno)); | |
8efc0c15 | 289 | } |
3c62e7eb | 290 | #endif |
63bd8c36 | 291 | /* Get user data. */ |
292 | pw = getpwuid(original_real_uid); | |
293 | if (!pw) { | |
294 | log("You don't exist, go away!"); | |
295 | exit(1); | |
296 | } | |
297 | /* Take a copy of the returned structure. */ | |
298 | pw = pwcopy(pw); | |
299 | ||
aa3378df | 300 | /* |
301 | * Use uid-swapping to give up root privileges for the duration of | |
302 | * option processing. We will re-instantiate the rights when we are | |
303 | * ready to create the privileged port, and will permanently drop | |
304 | * them when the port has been created (actually, when the connection | |
305 | * has been made, as we may need to create the port several times). | |
306 | */ | |
63bd8c36 | 307 | temporarily_use_uid(pw); |
5260325f | 308 | |
aa3378df | 309 | /* |
310 | * Set our umask to something reasonable, as some files are created | |
311 | * with the default umask. This will make them world-readable but | |
312 | * writable only by the owner, which is ok for all files for which we | |
313 | * don't set the modes explicitly. | |
314 | */ | |
5260325f | 315 | umask(022); |
316 | ||
5260325f | 317 | /* Initialize option structure to indicate that no values have been set. */ |
318 | initialize_options(&options); | |
319 | ||
320 | /* Parse command-line arguments. */ | |
321 | host = NULL; | |
322 | ||
f5a1a01a | 323 | again: |
324 | while ((opt = getopt(ac, av, | |
e591b98a | 325 | "1246ab:c:e:fgi:kl:m:no:p:qstvxACD:F:I:L:NPR:TVX")) != -1) { |
5260325f | 326 | switch (opt) { |
1f3bf5aa | 327 | case '1': |
328 | options.protocol = SSH_PROTO_1; | |
329 | break; | |
6ae2364d | 330 | case '2': |
331 | options.protocol = SSH_PROTO_2; | |
332 | break; | |
48e671d5 | 333 | case '4': |
334 | IPv4or6 = AF_INET; | |
335 | break; | |
48e671d5 | 336 | case '6': |
337 | IPv4or6 = AF_INET6; | |
338 | break; | |
5260325f | 339 | case 'n': |
340 | stdin_null_flag = 1; | |
341 | break; | |
5260325f | 342 | case 'f': |
343 | fork_after_authentication_flag = 1; | |
344 | stdin_null_flag = 1; | |
345 | break; | |
5260325f | 346 | case 'x': |
347 | options.forward_x11 = 0; | |
348 | break; | |
5260325f | 349 | case 'X': |
350 | options.forward_x11 = 1; | |
351 | break; | |
5260325f | 352 | case 'g': |
353 | options.gateway_ports = 1; | |
354 | break; | |
5260325f | 355 | case 'P': |
356 | options.use_privileged_port = 0; | |
357 | break; | |
5260325f | 358 | case 'a': |
359 | options.forward_agent = 0; | |
360 | break; | |
71276795 | 361 | case 'A': |
362 | options.forward_agent = 1; | |
363 | break; | |
5260325f | 364 | #ifdef AFS |
365 | case 'k': | |
366 | options.kerberos_tgt_passing = 0; | |
367 | options.afs_token_passing = 0; | |
368 | break; | |
369 | #endif | |
370 | case 'i': | |
371 | if (stat(optarg, &st) < 0) { | |
f5a1a01a | 372 | fprintf(stderr, "Warning: Identity file %s " |
373 | "does not exist.\n", optarg); | |
5260325f | 374 | break; |
375 | } | |
f5a1a01a | 376 | if (options.num_identity_files >= |
377 | SSH_MAX_IDENTITY_FILES) | |
378 | fatal("Too many identity files specified " | |
379 | "(max %d)", SSH_MAX_IDENTITY_FILES); | |
380 | options.identity_files[options.num_identity_files++] = | |
381 | xstrdup(optarg); | |
5260325f | 382 | break; |
383546c4 | 383 | case 'I': |
384 | #ifdef SMARTCARD | |
9ff6f66f | 385 | options.smartcard_device = xstrdup(optarg); |
dd2495cb | 386 | #else |
383546c4 | 387 | fprintf(stderr, "no support for smartcards.\n"); |
dd2495cb | 388 | #endif |
383546c4 | 389 | break; |
5260325f | 390 | case 't': |
8abcdba4 | 391 | if (tty_flag) |
392 | force_tty_flag = 1; | |
5260325f | 393 | tty_flag = 1; |
394 | break; | |
5260325f | 395 | case 'v': |
bcbf86ec | 396 | if (0 == debug_flag) { |
397 | debug_flag = 1; | |
398 | options.log_level = SYSLOG_LEVEL_DEBUG1; | |
399 | } else if (options.log_level < SYSLOG_LEVEL_DEBUG3) { | |
400 | options.log_level++; | |
401 | break; | |
f5a1a01a | 402 | } else |
54b974dc | 403 | fatal("Too high debugging level."); |
bcbf86ec | 404 | /* fallthrough */ |
5260325f | 405 | case 'V': |
e68225b2 | 406 | fprintf(stderr, |
407 | "%s, SSH protocols %d.%d/%d.%d, OpenSSL 0x%8.8lx\n", | |
a8be9f80 | 408 | SSH_VERSION, |
409 | PROTOCOL_MAJOR_1, PROTOCOL_MINOR_1, | |
e68225b2 | 410 | PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2, |
411 | SSLeay()); | |
5260325f | 412 | if (opt == 'V') |
413 | exit(0); | |
5260325f | 414 | break; |
5260325f | 415 | case 'q': |
416 | options.log_level = SYSLOG_LEVEL_QUIET; | |
417 | break; | |
5260325f | 418 | case 'e': |
419 | if (optarg[0] == '^' && optarg[2] == 0 && | |
f5a1a01a | 420 | (u_char) optarg[1] >= 64 && |
421 | (u_char) optarg[1] < 128) | |
1e3b8b07 | 422 | options.escape_char = (u_char) optarg[1] & 31; |
5260325f | 423 | else if (strlen(optarg) == 1) |
1e3b8b07 | 424 | options.escape_char = (u_char) optarg[0]; |
5260325f | 425 | else if (strcmp(optarg, "none") == 0) |
4bf9c10e | 426 | options.escape_char = SSH_ESCAPECHAR_NONE; |
5260325f | 427 | else { |
f5a1a01a | 428 | fprintf(stderr, "Bad escape character '%s'.\n", |
429 | optarg); | |
5260325f | 430 | exit(1); |
431 | } | |
432 | break; | |
5260325f | 433 | case 'c': |
a306f2dd | 434 | if (ciphers_valid(optarg)) { |
435 | /* SSH2 only */ | |
436 | options.ciphers = xstrdup(optarg); | |
d0c832f3 | 437 | options.cipher = SSH_CIPHER_ILLEGAL; |
a306f2dd | 438 | } else { |
439 | /* SSH1 only */ | |
c523303b | 440 | options.cipher = cipher_number(optarg); |
441 | if (options.cipher == -1) { | |
f5a1a01a | 442 | fprintf(stderr, |
443 | "Unknown cipher type '%s'\n", | |
444 | optarg); | |
a306f2dd | 445 | exit(1); |
446 | } | |
f5a1a01a | 447 | if (options.cipher == SSH_CIPHER_3DES) |
c523303b | 448 | options.ciphers = "3des-cbc"; |
f5a1a01a | 449 | else if (options.cipher == SSH_CIPHER_BLOWFISH) |
c523303b | 450 | options.ciphers = "blowfish-cbc"; |
f5a1a01a | 451 | else |
c523303b | 452 | options.ciphers = (char *)-1; |
5260325f | 453 | } |
454 | break; | |
b2552997 | 455 | case 'm': |
456 | if (mac_valid(optarg)) | |
457 | options.macs = xstrdup(optarg); | |
458 | else { | |
f5a1a01a | 459 | fprintf(stderr, "Unknown mac type '%s'\n", |
460 | optarg); | |
b2552997 | 461 | exit(1); |
462 | } | |
463 | break; | |
5260325f | 464 | case 'p': |
2d2a2c65 | 465 | options.port = a2port(optarg); |
466 | if (options.port == 0) { | |
6031af8d | 467 | fprintf(stderr, "Bad port '%s'\n", optarg); |
468 | exit(1); | |
469 | } | |
5260325f | 470 | break; |
5260325f | 471 | case 'l': |
472 | options.user = optarg; | |
473 | break; | |
d2e3df16 | 474 | |
475 | case 'L': | |
5260325f | 476 | case 'R': |
d2e3df16 | 477 | if (sscanf(optarg, "%5[0-9]:%255[^:]:%5[0-9]", |
478 | sfwd_port, buf, sfwd_host_port) != 3 && | |
479 | sscanf(optarg, "%5[0-9]/%255[^/]/%5[0-9]", | |
480 | sfwd_port, buf, sfwd_host_port) != 3) { | |
f5a1a01a | 481 | fprintf(stderr, |
d2e3df16 | 482 | "Bad forwarding specification '%s'\n", |
f5a1a01a | 483 | optarg); |
5260325f | 484 | usage(); |
485 | /* NOTREACHED */ | |
486 | } | |
d2e3df16 | 487 | if ((fwd_port = a2port(sfwd_port)) == 0 || |
488 | (fwd_host_port = a2port(sfwd_host_port)) == 0) { | |
f5a1a01a | 489 | fprintf(stderr, |
d2e3df16 | 490 | "Bad forwarding port(s) '%s'\n", optarg); |
491 | exit(1); | |
5260325f | 492 | } |
d2e3df16 | 493 | if (opt == 'L') |
494 | add_local_forward(&options, fwd_port, buf, | |
495 | fwd_host_port); | |
496 | else if (opt == 'R') | |
497 | add_remote_forward(&options, fwd_port, buf, | |
498 | fwd_host_port); | |
5260325f | 499 | break; |
0490e609 | 500 | |
501 | case 'D': | |
2d2a2c65 | 502 | fwd_port = a2port(optarg); |
503 | if (fwd_port == 0) { | |
f5a1a01a | 504 | fprintf(stderr, "Bad dynamic port '%s'\n", |
505 | optarg); | |
6031af8d | 506 | exit(1); |
507 | } | |
0490e609 | 508 | add_local_forward(&options, fwd_port, "socks4", 0); |
509 | break; | |
510 | ||
5260325f | 511 | case 'C': |
512 | options.compression = 1; | |
513 | break; | |
8ce64345 | 514 | case 'N': |
515 | no_shell_flag = 1; | |
516 | no_tty_flag = 1; | |
517 | break; | |
8ce64345 | 518 | case 'T': |
519 | no_tty_flag = 1; | |
520 | break; | |
5260325f | 521 | case 'o': |
522 | dummy = 1; | |
f5a1a01a | 523 | if (process_config_line(&options, host ? host : "", |
524 | optarg, "command-line", 0, &dummy) != 0) | |
5260325f | 525 | exit(1); |
526 | break; | |
ae810de7 | 527 | case 's': |
528 | subsystem_flag = 1; | |
529 | break; | |
3435f5a6 | 530 | case 'b': |
531 | options.bind_address = optarg; | |
532 | break; | |
e591b98a | 533 | case 'F': |
534 | config = optarg; | |
535 | break; | |
5260325f | 536 | default: |
537 | usage(); | |
538 | } | |
539 | } | |
540 | ||
f5a1a01a | 541 | ac -= optind; |
542 | av += optind; | |
543 | ||
544 | if (ac > 0 && !host && **av != '-') { | |
545 | if (strchr(*av, '@')) { | |
546 | p = xstrdup(*av); | |
547 | cp = strchr(p, '@'); | |
548 | if (cp == NULL || cp == p) | |
549 | usage(); | |
550 | options.user = p; | |
551 | *cp = '\0'; | |
552 | host = ++cp; | |
553 | } else | |
554 | host = *av; | |
555 | ac--, av++; | |
556 | if (ac > 0) { | |
557 | optind = 0; | |
558 | optreset = 1; | |
559 | goto again; | |
560 | } | |
561 | } | |
562 | ||
5260325f | 563 | /* Check that we got a host name. */ |
564 | if (!host) | |
8efc0c15 | 565 | usage(); |
5260325f | 566 | |
22d89d24 | 567 | SSLeay_add_all_algorithms(); |
fa08c86b | 568 | ERR_load_crypto_strings(); |
22d89d24 | 569 | |
5260325f | 570 | /* Initialize the command to execute on remote host. */ |
571 | buffer_init(&command); | |
572 | ||
aa3378df | 573 | /* |
574 | * Save the command to execute on the remote host in a buffer. There | |
575 | * is no limit on the length of the command, except by the maximum | |
576 | * packet size. Also sets the tty flag if there is no command. | |
577 | */ | |
f5a1a01a | 578 | if (!ac) { |
5260325f | 579 | /* No command specified - execute shell on a tty. */ |
580 | tty_flag = 1; | |
ae810de7 | 581 | if (subsystem_flag) { |
f5a1a01a | 582 | fprintf(stderr, |
583 | "You must specify a subsystem to invoke.\n"); | |
ae810de7 | 584 | usage(); |
585 | } | |
5260325f | 586 | } else { |
f5a1a01a | 587 | /* A command has been specified. Store it into the buffer. */ |
588 | for (i = 0; i < ac; i++) { | |
589 | if (i) | |
5260325f | 590 | buffer_append(&command, " ", 1); |
591 | buffer_append(&command, av[i], strlen(av[i])); | |
592 | } | |
8efc0c15 | 593 | } |
5260325f | 594 | |
595 | /* Cannot fork to background if no command. */ | |
14a9a859 | 596 | if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag) |
5260325f | 597 | fatal("Cannot fork into background without a command to execute."); |
598 | ||
599 | /* Allocate a tty by default if no command specified. */ | |
600 | if (buffer_len(&command) == 0) | |
601 | tty_flag = 1; | |
602 | ||
0b6fbf03 | 603 | /* Force no tty*/ |
604 | if (no_tty_flag) | |
605 | tty_flag = 0; | |
5260325f | 606 | /* Do not allocate a tty if stdin is not a tty. */ |
8abcdba4 | 607 | if (!isatty(fileno(stdin)) && !force_tty_flag) { |
5260325f | 608 | if (tty_flag) |
54b974dc | 609 | log("Pseudo-terminal will not be allocated because stdin is not a terminal."); |
5260325f | 610 | tty_flag = 0; |
611 | } | |
8ce64345 | 612 | |
20244695 | 613 | /* |
614 | * Initialize "log" output. Since we are the client all output | |
615 | * actually goes to stderr. | |
616 | */ | |
cc44f691 | 617 | log_init(av[0], options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level, |
618 | SYSLOG_FACILITY_USER, 1); | |
5260325f | 619 | |
e591b98a | 620 | /* |
621 | * Read per-user configuration file. Ignore the system wide config | |
622 | * file if the user specifies a config file on the command line. | |
623 | */ | |
624 | if (config != NULL) { | |
93111dfa | 625 | if (!read_config_file(config, host, &options)) |
626 | fatal("Can't open user config file %.100s: " | |
627 | "%.100s", config, strerror(errno)); | |
e591b98a | 628 | } else { |
629 | snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, | |
630 | _PATH_SSH_USER_CONFFILE); | |
631 | ||
632 | /* Read systemwide configuration file. */ | |
93111dfa | 633 | (void)read_config_file(_PATH_HOST_CONFIG_FILE, host, &options); |
634 | (void)read_config_file(buf, host, &options); | |
e591b98a | 635 | } |
5260325f | 636 | |
637 | /* Fill configuration defaults. */ | |
638 | fill_default_options(&options); | |
639 | ||
640 | /* reinit */ | |
20244695 | 641 | log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 1); |
5260325f | 642 | |
e339aa53 | 643 | seed_rng(); |
644 | ||
5260325f | 645 | if (options.user == NULL) |
646 | options.user = xstrdup(pw->pw_name); | |
647 | ||
648 | if (options.hostname != NULL) | |
649 | host = options.hostname; | |
650 | ||
5260325f | 651 | /* Disable rhosts authentication if not running as root. */ |
3c62e7eb | 652 | #ifdef HAVE_CYGWIN |
653 | /* Ignore uid if running under Windows */ | |
654 | if (!options.use_privileged_port) { | |
655 | #else | |
5260325f | 656 | if (original_effective_uid != 0 || !options.use_privileged_port) { |
3c62e7eb | 657 | #endif |
6ffc9c88 | 658 | debug("Rhosts Authentication disabled, " |
659 | "originating port will not be trusted."); | |
5260325f | 660 | options.rhosts_authentication = 0; |
5260325f | 661 | } |
aa3378df | 662 | /* |
663 | * If using rsh has been selected, exec it now (without trying | |
664 | * anything else). Note that we must release privileges first. | |
665 | */ | |
5260325f | 666 | if (options.use_rsh) { |
aa3378df | 667 | /* |
668 | * Restore our superuser privileges. This must be done | |
669 | * before permanently setting the uid. | |
670 | */ | |
5260325f | 671 | restore_uid(); |
672 | ||
673 | /* Switch to the original uid permanently. */ | |
63bd8c36 | 674 | permanently_set_uid(pw); |
5260325f | 675 | |
676 | /* Execute rsh. */ | |
677 | rsh_connect(host, options.user, &command); | |
678 | fatal("rsh_connect returned"); | |
8efc0c15 | 679 | } |
5260325f | 680 | /* Restore our superuser privileges. */ |
681 | restore_uid(); | |
682 | ||
6ffc9c88 | 683 | /* Open a connection to the remote host. */ |
5260325f | 684 | |
ce773142 | 685 | cerr = ssh_connect(host, &hostaddr, options.port, |
6ffc9c88 | 686 | options.connection_attempts, |
687 | original_effective_uid != 0 || !options.use_privileged_port, | |
63bd8c36 | 688 | pw, options.proxy_command); |
5260325f | 689 | |
aa3378df | 690 | /* |
691 | * If we successfully made the connection, load the host private key | |
692 | * in case we will need it later for combined rsa-rhosts | |
693 | * authentication. This must be done before releasing extra | |
694 | * privileges, because the file is only readable by root. | |
695 | */ | |
8002af61 | 696 | sensitive_data.nkeys = 0; |
697 | sensitive_data.keys = NULL; | |
ce773142 | 698 | if (!cerr && (options.rhosts_rsa_authentication || |
8002af61 | 699 | options.hostbased_authentication)) { |
700 | sensitive_data.nkeys = 3; | |
701 | sensitive_data.keys = xmalloc(sensitive_data.nkeys*sizeof(Key)); | |
702 | sensitive_data.keys[0] = key_load_private_type(KEY_RSA1, | |
aeaa3d9e | 703 | _PATH_HOST_KEY_FILE, "", NULL); |
8002af61 | 704 | sensitive_data.keys[1] = key_load_private_type(KEY_DSA, |
705 | _PATH_HOST_DSA_KEY_FILE, "", NULL); | |
706 | sensitive_data.keys[2] = key_load_private_type(KEY_RSA, | |
707 | _PATH_HOST_RSA_KEY_FILE, "", NULL); | |
5260325f | 708 | } |
aa3378df | 709 | /* |
710 | * Get rid of any extra privileges that we may have. We will no | |
711 | * longer need them. Also, extra privileges could make it very hard | |
712 | * to read identity files and other non-world-readable files from the | |
713 | * user's home directory if it happens to be on a NFS volume where | |
714 | * root is mapped to nobody. | |
715 | */ | |
716 | ||
717 | /* | |
718 | * Note that some legacy systems need to postpone the following call | |
719 | * to permanently_set_uid() until the private hostkey is destroyed | |
720 | * with RSA_free(). Otherwise the calling user could ptrace() the | |
721 | * process, read the private hostkey and impersonate the host. | |
722 | * OpenBSD does not allow ptracing of setuid processes. | |
723 | */ | |
63bd8c36 | 724 | permanently_set_uid(pw); |
5260325f | 725 | |
aa3378df | 726 | /* |
727 | * Now that we are back to our own permissions, create ~/.ssh | |
728 | * directory if it doesn\'t already exist. | |
729 | */ | |
c3abff07 | 730 | snprintf(buf, sizeof buf, "%.100s%s%.100s", pw->pw_dir, strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR); |
5260325f | 731 | if (stat(buf, &st) < 0) |
704b1659 | 732 | if (mkdir(buf, 0700) < 0) |
5260325f | 733 | error("Could not create directory '%.200s'.", buf); |
734 | ||
735 | /* Check if the connection failed, and try "rsh" if appropriate. */ | |
ce773142 | 736 | if (cerr) { |
737 | if (!options.fallback_to_rsh) | |
738 | exit(1); | |
5260325f | 739 | if (options.port != 0) |
ce773142 | 740 | log("Secure connection to %.100s on port %hu refused; " |
741 | "reverting to insecure method", | |
742 | host, options.port); | |
5260325f | 743 | else |
ce773142 | 744 | log("Secure connection to %.100s refused; " |
745 | "reverting to insecure method.", host); | |
5260325f | 746 | |
ce773142 | 747 | rsh_connect(host, options.user, &command); |
748 | fatal("rsh_connect returned"); | |
8efc0c15 | 749 | } |
fee56204 | 750 | /* load options.identity_files */ |
751 | load_public_identity_files(); | |
752 | ||
753 | /* Expand ~ in known host file names. */ | |
754 | /* XXX mem-leaks: */ | |
fa08c86b | 755 | options.system_hostfile = |
756 | tilde_expand_filename(options.system_hostfile, original_real_uid); | |
757 | options.user_hostfile = | |
758 | tilde_expand_filename(options.user_hostfile, original_real_uid); | |
759 | options.system_hostfile2 = | |
760 | tilde_expand_filename(options.system_hostfile2, original_real_uid); | |
761 | options.user_hostfile2 = | |
762 | tilde_expand_filename(options.user_hostfile2, original_real_uid); | |
5260325f | 763 | |
764 | /* Log into the remote system. This never returns if the login fails. */ | |
8002af61 | 765 | ssh_login(sensitive_data.keys, sensitive_data.nkeys, |
766 | host, (struct sockaddr *)&hostaddr, pw); | |
767 | ||
768 | /* We no longer need the private host keys. Clear them now. */ | |
769 | if (sensitive_data.nkeys != 0) { | |
770 | for (i = 0; i < sensitive_data.nkeys; i++) { | |
771 | if (sensitive_data.keys[i] != NULL) { | |
772 | /* Destroys contents safely */ | |
773 | debug3("clear hostkey %d", i); | |
774 | key_free(sensitive_data.keys[i]); | |
775 | sensitive_data.keys[i] = NULL; | |
776 | } | |
777 | } | |
778 | xfree(sensitive_data.keys); | |
779 | } | |
05b7537a | 780 | for (i = 0; i < options.num_identity_files; i++) { |
781 | if (options.identity_files[i]) { | |
782 | xfree(options.identity_files[i]); | |
783 | options.identity_files[i] = NULL; | |
784 | } | |
785 | if (options.identity_keys[i]) { | |
786 | key_free(options.identity_keys[i]); | |
787 | options.identity_keys[i] = NULL; | |
788 | } | |
789 | } | |
5260325f | 790 | |
8ce64345 | 791 | exit_status = compat20 ? ssh_session2() : ssh_session(); |
792 | packet_close(); | |
793 | return exit_status; | |
794 | } | |
795 | ||
396c147e | 796 | static void |
0b242b12 | 797 | x11_get_proto(char *proto, int proto_len, char *data, int data_len) |
798 | { | |
799 | char line[512]; | |
800 | FILE *f; | |
801 | int got_data = 0, i; | |
802 | ||
fa649821 | 803 | if (options.xauth_location) { |
804 | /* Try to get Xauthority information for the display. */ | |
5ca51e19 | 805 | snprintf(line, sizeof line, "%.100s list %.200s 2>" _PATH_DEVNULL, |
fa649821 | 806 | options.xauth_location, getenv("DISPLAY")); |
807 | f = popen(line, "r"); | |
808 | if (f && fgets(line, sizeof(line), f) && | |
809 | sscanf(line, "%*s %s %s", proto, data) == 2) | |
810 | got_data = 1; | |
811 | if (f) | |
812 | pclose(f); | |
813 | } | |
0b242b12 | 814 | /* |
815 | * If we didn't get authentication data, just make up some | |
816 | * data. The forwarding code will check the validity of the | |
817 | * response anyway, and substitute this data. The X11 | |
818 | * server, however, will ignore this fake data and use | |
819 | * whatever authentication mechanisms it was using otherwise | |
820 | * for the local connection. | |
821 | */ | |
822 | if (!got_data) { | |
823 | u_int32_t rand = 0; | |
824 | ||
825 | strlcpy(proto, "MIT-MAGIC-COOKIE-1", proto_len); | |
826 | for (i = 0; i < 16; i++) { | |
827 | if (i % 4 == 0) | |
828 | rand = arc4random(); | |
829 | snprintf(data + 2 * i, data_len - 2 * i, "%02x", rand & 0xff); | |
830 | rand >>= 8; | |
831 | } | |
832 | } | |
833 | } | |
834 | ||
396c147e | 835 | static void |
fa08c86b | 836 | ssh_init_forwarding(void) |
837 | { | |
02a024dd | 838 | int success = 0; |
fa08c86b | 839 | int i; |
02a024dd | 840 | |
fa08c86b | 841 | /* Initiate local TCP/IP port forwardings. */ |
842 | for (i = 0; i < options.num_local_forwards; i++) { | |
843 | debug("Connections to local port %d forwarded to remote address %.200s:%d", | |
844 | options.local_forwards[i].port, | |
845 | options.local_forwards[i].host, | |
846 | options.local_forwards[i].host_port); | |
02a024dd | 847 | success += channel_request_local_forwarding( |
fa08c86b | 848 | options.local_forwards[i].port, |
849 | options.local_forwards[i].host, | |
850 | options.local_forwards[i].host_port, | |
851 | options.gateway_ports); | |
852 | } | |
02a024dd | 853 | if (i > 0 && success == 0) |
854 | error("Could not request local forwarding."); | |
fa08c86b | 855 | |
856 | /* Initiate remote TCP/IP port forwardings. */ | |
857 | for (i = 0; i < options.num_remote_forwards; i++) { | |
858 | debug("Connections to remote port %d forwarded to local address %.200s:%d", | |
859 | options.remote_forwards[i].port, | |
860 | options.remote_forwards[i].host, | |
861 | options.remote_forwards[i].host_port); | |
862 | channel_request_remote_forwarding( | |
863 | options.remote_forwards[i].port, | |
864 | options.remote_forwards[i].host, | |
865 | options.remote_forwards[i].host_port); | |
866 | } | |
867 | } | |
868 | ||
396c147e | 869 | static void |
fa08c86b | 870 | check_agent_present(void) |
871 | { | |
872 | if (options.forward_agent) { | |
873 | /* Clear agent forwarding if we don\'t have an agent. */ | |
874 | int authfd = ssh_get_authentication_socket(); | |
875 | if (authfd < 0) | |
876 | options.forward_agent = 0; | |
877 | else | |
878 | ssh_close_authentication_socket(authfd); | |
879 | } | |
880 | } | |
881 | ||
396c147e | 882 | static int |
8ce64345 | 883 | ssh_session(void) |
884 | { | |
885 | int type; | |
8ce64345 | 886 | int plen; |
887 | int interactive = 0; | |
888 | int have_tty = 0; | |
889 | struct winsize ws; | |
8ce64345 | 890 | char *cp; |
891 | ||
5260325f | 892 | /* Enable compression if requested. */ |
893 | if (options.compression) { | |
894 | debug("Requesting compression at level %d.", options.compression_level); | |
895 | ||
896 | if (options.compression_level < 1 || options.compression_level > 9) | |
897 | fatal("Compression level must be from 1 (fast) to 9 (slow, best)."); | |
898 | ||
899 | /* Send the request. */ | |
900 | packet_start(SSH_CMSG_REQUEST_COMPRESSION); | |
901 | packet_put_int(options.compression_level); | |
902 | packet_send(); | |
903 | packet_write_wait(); | |
904 | type = packet_read(&plen); | |
905 | if (type == SSH_SMSG_SUCCESS) | |
906 | packet_start_compression(options.compression_level); | |
907 | else if (type == SSH_SMSG_FAILURE) | |
908 | log("Warning: Remote host refused compression."); | |
909 | else | |
910 | packet_disconnect("Protocol error waiting for compression response."); | |
911 | } | |
912 | /* Allocate a pseudo tty if appropriate. */ | |
913 | if (tty_flag) { | |
914 | debug("Requesting pty."); | |
915 | ||
916 | /* Start the packet. */ | |
917 | packet_start(SSH_CMSG_REQUEST_PTY); | |
918 | ||
919 | /* Store TERM in the packet. There is no limit on the | |
920 | length of the string. */ | |
921 | cp = getenv("TERM"); | |
922 | if (!cp) | |
923 | cp = ""; | |
449c5ba5 | 924 | packet_put_cstring(cp); |
5260325f | 925 | |
926 | /* Store window size in the packet. */ | |
927 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) | |
928 | memset(&ws, 0, sizeof(ws)); | |
929 | packet_put_int(ws.ws_row); | |
930 | packet_put_int(ws.ws_col); | |
931 | packet_put_int(ws.ws_xpixel); | |
932 | packet_put_int(ws.ws_ypixel); | |
933 | ||
934 | /* Store tty modes in the packet. */ | |
30dcc918 | 935 | tty_make_modes(fileno(stdin), NULL); |
5260325f | 936 | |
937 | /* Send the packet, and wait for it to leave. */ | |
938 | packet_send(); | |
939 | packet_write_wait(); | |
940 | ||
941 | /* Read response from the server. */ | |
942 | type = packet_read(&plen); | |
4fe2af09 | 943 | if (type == SSH_SMSG_SUCCESS) { |
5260325f | 944 | interactive = 1; |
8ce64345 | 945 | have_tty = 1; |
4fe2af09 | 946 | } else if (type == SSH_SMSG_FAILURE) |
5260325f | 947 | log("Warning: Remote host failed or refused to allocate a pseudo tty."); |
948 | else | |
949 | packet_disconnect("Protocol error waiting for pty request response."); | |
950 | } | |
951 | /* Request X11 forwarding if enabled and DISPLAY is set. */ | |
952 | if (options.forward_x11 && getenv("DISPLAY") != NULL) { | |
0b242b12 | 953 | char proto[512], data[512]; |
954 | /* Get reasonable local authentication information. */ | |
955 | x11_get_proto(proto, sizeof proto, data, sizeof data); | |
956 | /* Request forwarding with authentication spoofing. */ | |
5260325f | 957 | debug("Requesting X11 forwarding with authentication spoofing."); |
0b242b12 | 958 | x11_request_forwarding_with_spoofing(0, proto, data); |
5260325f | 959 | |
960 | /* Read response from the server. */ | |
961 | type = packet_read(&plen); | |
962 | if (type == SSH_SMSG_SUCCESS) { | |
5260325f | 963 | interactive = 1; |
0b242b12 | 964 | } else if (type == SSH_SMSG_FAILURE) { |
5260325f | 965 | log("Warning: Remote host denied X11 forwarding."); |
0b242b12 | 966 | } else { |
5260325f | 967 | packet_disconnect("Protocol error waiting for X11 forwarding"); |
0b242b12 | 968 | } |
5260325f | 969 | } |
970 | /* Tell the packet module whether this is an interactive session. */ | |
b5c334cc | 971 | packet_set_interactive(interactive); |
5260325f | 972 | |
973 | /* Request authentication agent forwarding if appropriate. */ | |
fa08c86b | 974 | check_agent_present(); |
975 | ||
5260325f | 976 | if (options.forward_agent) { |
977 | debug("Requesting authentication agent forwarding."); | |
978 | auth_request_forwarding(); | |
979 | ||
980 | /* Read response from the server. */ | |
981 | type = packet_read(&plen); | |
982 | packet_integrity_check(plen, 0, type); | |
983 | if (type != SSH_SMSG_SUCCESS) | |
984 | log("Warning: Remote host denied authentication agent forwarding."); | |
985 | } | |
8efc0c15 | 986 | |
fa08c86b | 987 | /* Initiate port forwardings. */ |
988 | ssh_init_forwarding(); | |
5260325f | 989 | |
aa3378df | 990 | /* If requested, let ssh continue in the background. */ |
6ae2364d | 991 | if (fork_after_authentication_flag) |
aa3378df | 992 | if (daemon(1, 1) < 0) |
993 | fatal("daemon() failed: %.200s", strerror(errno)); | |
994 | ||
995 | /* | |
996 | * If a command was specified on the command line, execute the | |
997 | * command now. Otherwise request the server to start a shell. | |
998 | */ | |
5260325f | 999 | if (buffer_len(&command) > 0) { |
1000 | int len = buffer_len(&command); | |
1001 | if (len > 900) | |
1002 | len = 900; | |
1003 | debug("Sending command: %.*s", len, buffer_ptr(&command)); | |
1004 | packet_start(SSH_CMSG_EXEC_CMD); | |
1005 | packet_put_string(buffer_ptr(&command), buffer_len(&command)); | |
1006 | packet_send(); | |
1007 | packet_write_wait(); | |
1008 | } else { | |
1009 | debug("Requesting shell."); | |
1010 | packet_start(SSH_CMSG_EXEC_SHELL); | |
1011 | packet_send(); | |
1012 | packet_write_wait(); | |
1013 | } | |
1014 | ||
1015 | /* Enter the interactive session. */ | |
4bf9c10e | 1016 | return client_loop(have_tty, tty_flag ? |
1017 | options.escape_char : SSH_ESCAPECHAR_NONE, 0); | |
8ce64345 | 1018 | } |
5260325f | 1019 | |
396c147e | 1020 | static void |
1f3bf5aa | 1021 | client_subsystem_reply(int type, int plen, void *ctxt) |
1022 | { | |
1023 | int id, len; | |
1024 | ||
1025 | id = packet_get_int(); | |
1026 | len = buffer_len(&command); | |
ce91d6f8 | 1027 | if (len > 900) |
1028 | len = 900; | |
1f3bf5aa | 1029 | packet_done(); |
1030 | if (type == SSH2_MSG_CHANNEL_FAILURE) | |
1031 | fatal("Request for subsystem '%.*s' failed on channel %d", | |
1032 | len, buffer_ptr(&command), id); | |
1033 | } | |
1034 | ||
bcdb96c2 | 1035 | /* request pty/x11/agent/tcpfwd/shell for channel */ |
396c147e | 1036 | static void |
bcdb96c2 | 1037 | ssh_session2_setup(int id, void *arg) |
8ce64345 | 1038 | { |
1039 | int len; | |
b5c334cc | 1040 | int interactive = 0; |
30dcc918 | 1041 | struct termios tio; |
b5c334cc | 1042 | |
bcdb96c2 | 1043 | debug("ssh_session2_setup: id %d", id); |
8ce64345 | 1044 | |
8ce64345 | 1045 | if (tty_flag) { |
1046 | struct winsize ws; | |
1047 | char *cp; | |
1048 | cp = getenv("TERM"); | |
1049 | if (!cp) | |
1050 | cp = ""; | |
1051 | /* Store window size in the packet. */ | |
1052 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) | |
1053 | memset(&ws, 0, sizeof(ws)); | |
1054 | ||
1055 | channel_request_start(id, "pty-req", 0); | |
1056 | packet_put_cstring(cp); | |
1057 | packet_put_int(ws.ws_col); | |
1058 | packet_put_int(ws.ws_row); | |
1059 | packet_put_int(ws.ws_xpixel); | |
1060 | packet_put_int(ws.ws_ypixel); | |
30dcc918 | 1061 | tio = get_saved_tio(); |
1062 | tty_make_modes(/*ignored*/ 0, &tio); | |
8ce64345 | 1063 | packet_send(); |
b5c334cc | 1064 | interactive = 1; |
8ce64345 | 1065 | /* XXX wait for reply */ |
1066 | } | |
0b242b12 | 1067 | if (options.forward_x11 && |
1068 | getenv("DISPLAY") != NULL) { | |
1069 | char proto[512], data[512]; | |
1070 | /* Get reasonable local authentication information. */ | |
1071 | x11_get_proto(proto, sizeof proto, data, sizeof data); | |
1072 | /* Request forwarding with authentication spoofing. */ | |
1073 | debug("Requesting X11 forwarding with authentication spoofing."); | |
1074 | x11_request_forwarding_with_spoofing(id, proto, data); | |
b5c334cc | 1075 | interactive = 1; |
0b242b12 | 1076 | /* XXX wait for reply */ |
1077 | } | |
1078 | ||
fa08c86b | 1079 | check_agent_present(); |
1080 | if (options.forward_agent) { | |
1081 | debug("Requesting authentication agent forwarding."); | |
1082 | channel_request_start(id, "auth-agent-req@openssh.com", 0); | |
1083 | packet_send(); | |
1084 | } | |
1085 | ||
8ce64345 | 1086 | len = buffer_len(&command); |
1087 | if (len > 0) { | |
1088 | if (len > 900) | |
1089 | len = 900; | |
ae810de7 | 1090 | if (subsystem_flag) { |
1091 | debug("Sending subsystem: %.*s", len, buffer_ptr(&command)); | |
1f3bf5aa | 1092 | channel_request_start(id, "subsystem", /*want reply*/ 1); |
1093 | /* register callback for reply */ | |
1094 | /* XXX we asume that client_loop has already been called */ | |
1095 | dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &client_subsystem_reply); | |
1096 | dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &client_subsystem_reply); | |
ae810de7 | 1097 | } else { |
1098 | debug("Sending command: %.*s", len, buffer_ptr(&command)); | |
1099 | channel_request_start(id, "exec", 0); | |
1100 | } | |
ce91d6f8 | 1101 | packet_put_string(buffer_ptr(&command), buffer_len(&command)); |
8ce64345 | 1102 | packet_send(); |
1103 | } else { | |
1104 | channel_request(id, "shell", 0); | |
1105 | } | |
1106 | /* channel_callback(id, SSH2_MSG_OPEN_CONFIGMATION, client_init, 0); */ | |
1f3bf5aa | 1107 | |
8ce64345 | 1108 | /* register different callback, etc. XXX */ |
b5c334cc | 1109 | packet_set_interactive(interactive); |
8ce64345 | 1110 | } |
1111 | ||
bcdb96c2 | 1112 | /* open new channel for a session */ |
396c147e | 1113 | static int |
bcdb96c2 | 1114 | ssh_session2_open(void) |
8ce64345 | 1115 | { |
719fc62f | 1116 | Channel *c; |
1117 | int window, packetmax, in, out, err; | |
2e73a022 | 1118 | |
14a9a859 | 1119 | if (stdin_null_flag) { |
5ca51e19 | 1120 | in = open(_PATH_DEVNULL, O_RDONLY); |
14a9a859 | 1121 | } else { |
1122 | in = dup(STDIN_FILENO); | |
1123 | } | |
2e73a022 | 1124 | out = dup(STDOUT_FILENO); |
1125 | err = dup(STDERR_FILENO); | |
8ce64345 | 1126 | |
1127 | if (in < 0 || out < 0 || err < 0) | |
14a9a859 | 1128 | fatal("dup() in/out/err failed"); |
8ce64345 | 1129 | |
a22aff1f | 1130 | /* enable nonblocking unless tty */ |
1131 | if (!isatty(in)) | |
1132 | set_nonblock(in); | |
1133 | if (!isatty(out)) | |
1134 | set_nonblock(out); | |
1135 | if (!isatty(err)) | |
1136 | set_nonblock(err); | |
1137 | ||
bcbf86ec | 1138 | window = CHAN_SES_WINDOW_DEFAULT; |
1139 | packetmax = CHAN_SES_PACKET_DEFAULT; | |
1140 | if (!tty_flag) { | |
8ce64345 | 1141 | window *= 2; |
bcbf86ec | 1142 | packetmax *=2; |
8ce64345 | 1143 | } |
719fc62f | 1144 | c = channel_new( |
8ce64345 | 1145 | "session", SSH_CHANNEL_OPENING, in, out, err, |
bcbf86ec | 1146 | window, packetmax, CHAN_EXTENDED_WRITE, |
a22aff1f | 1147 | xstrdup("client-session"), /*nonblock*/0); |
719fc62f | 1148 | if (c == NULL) |
bcdb96c2 | 1149 | fatal("ssh_session2_open: channel_new failed"); |
8ce64345 | 1150 | |
bcdb96c2 | 1151 | debug3("ssh_session2_open: channel_new: %d", c->self); |
eb0dd41f | 1152 | |
36e1f6a1 | 1153 | channel_send_open(c->self); |
bcdb96c2 | 1154 | if (!no_shell_flag) |
1155 | channel_register_callback(c->self, | |
1156 | SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, | |
1157 | ssh_session2_setup, (void *)0); | |
5260325f | 1158 | |
719fc62f | 1159 | return c->self; |
eb0dd41f | 1160 | } |
1161 | ||
396c147e | 1162 | static int |
eb0dd41f | 1163 | ssh_session2(void) |
1164 | { | |
bcdb96c2 | 1165 | int id = -1; |
eb0dd41f | 1166 | |
1167 | /* XXX should be pre-session */ | |
1168 | ssh_init_forwarding(); | |
1169 | ||
bcdb96c2 | 1170 | if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN)) |
1171 | id = ssh_session2_open(); | |
eb0dd41f | 1172 | |
1173 | /* If requested, let ssh continue in the background. */ | |
1174 | if (fork_after_authentication_flag) | |
1175 | if (daemon(1, 1) < 0) | |
1176 | fatal("daemon() failed: %.200s", strerror(errno)); | |
1177 | ||
4bf9c10e | 1178 | return client_loop(tty_flag, tty_flag ? |
1179 | options.escape_char : SSH_ESCAPECHAR_NONE, id); | |
8efc0c15 | 1180 | } |
fa08c86b | 1181 | |
396c147e | 1182 | static void |
fee56204 | 1183 | load_public_identity_files(void) |
1184 | { | |
1185 | char *filename; | |
1186 | Key *public; | |
2e23cde0 | 1187 | int i = 0; |
fee56204 | 1188 | |
383546c4 | 1189 | #ifdef SMARTCARD |
9ff6f66f | 1190 | if (options.smartcard_device != NULL && |
383546c4 | 1191 | options.num_identity_files + 1 < SSH_MAX_IDENTITY_FILES && |
eea098a3 | 1192 | (public = sc_get_key(options.smartcard_device)) != NULL ) { |
383546c4 | 1193 | Key *new; |
1194 | ||
2e23cde0 | 1195 | if (options.num_identity_files + 2 > SSH_MAX_IDENTITY_FILES) |
1196 | options.num_identity_files = SSH_MAX_IDENTITY_FILES - 2; | |
1197 | memmove(&options.identity_files[2], &options.identity_files[0], | |
1198 | sizeof(char *) * options.num_identity_files); | |
1199 | options.num_identity_files += 2; | |
1200 | i = 2; | |
1201 | ||
383546c4 | 1202 | /* XXX ssh1 vs ssh2 */ |
1203 | new = key_new(KEY_RSA); | |
1204 | new->flags = KEY_FLAG_EXT; | |
1205 | BN_copy(new->rsa->n, public->rsa->n); | |
1206 | BN_copy(new->rsa->e, public->rsa->e); | |
1207 | RSA_set_method(new->rsa, sc_get_engine()); | |
2e23cde0 | 1208 | options.identity_keys[0] = new; |
1209 | options.identity_files[0] = xstrdup("smartcard rsa key");; | |
383546c4 | 1210 | |
1211 | new = key_new(KEY_RSA1); | |
1212 | new->flags = KEY_FLAG_EXT; | |
1213 | BN_copy(new->rsa->n, public->rsa->n); | |
1214 | BN_copy(new->rsa->e, public->rsa->e); | |
1215 | RSA_set_method(new->rsa, sc_get_engine()); | |
2e23cde0 | 1216 | options.identity_keys[1] = new; |
1217 | options.identity_files[1] = xstrdup("smartcard rsa1 key"); | |
383546c4 | 1218 | |
1219 | key_free(public); | |
1220 | } | |
3e984472 | 1221 | #endif /* SMARTCARD */ |
2e23cde0 | 1222 | for (; i < options.num_identity_files; i++) { |
1223 | filename = tilde_expand_filename(options.identity_files[i], | |
1224 | original_real_uid); | |
1225 | public = key_load_public(filename, NULL); | |
1226 | debug("identity file %s type %d", filename, | |
1227 | public ? public->type : -1); | |
1228 | xfree(options.identity_files[i]); | |
1229 | options.identity_files[i] = filename; | |
1230 | options.identity_keys[i] = public; | |
1231 | } | |
fee56204 | 1232 | } |