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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" | |
c3abff07 | 42 | RCSID("$OpenBSD: ssh.c,v 1.138 2001/08/11 22:51:27 jakob 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 | ||
aa3378df | 121 | /* |
122 | * Name of the host we are connecting to. This is the name given on the | |
123 | * command line, or the HostName specified for the user-supplied name in a | |
124 | * configuration file. | |
125 | */ | |
8efc0c15 | 126 | char *host; |
127 | ||
128 | /* socket address the host resolves to */ | |
48e671d5 | 129 | struct sockaddr_storage hostaddr; |
8efc0c15 | 130 | |
aa3378df | 131 | /* |
132 | * Flag to indicate that we have received a window change signal which has | |
133 | * not yet been processed. This will cause a message indicating the new | |
134 | * window size to be sent to the server a little later. This is volatile | |
135 | * because this is updated in a signal handler. | |
136 | */ | |
8efc0c15 | 137 | volatile int received_window_change_signal = 0; |
138 | ||
8002af61 | 139 | /* Private host keys. */ |
140 | struct { | |
141 | Key **keys; | |
142 | int nkeys; | |
143 | } sensitive_data; | |
8efc0c15 | 144 | |
145 | /* Original real UID. */ | |
146 | uid_t original_real_uid; | |
147 | ||
8ce64345 | 148 | /* command to be executed */ |
149 | Buffer command; | |
150 | ||
ae810de7 | 151 | /* Should we execute a command or invoke a subsystem? */ |
152 | int subsystem_flag = 0; | |
153 | ||
8efc0c15 | 154 | /* Prints a help message to the user. This function never returns. */ |
155 | ||
396c147e | 156 | static void |
5ca51e19 | 157 | usage(void) |
8efc0c15 | 158 | { |
1fe6a48f | 159 | fprintf(stderr, "Usage: %s [options] host [command]\n", __progname); |
5260325f | 160 | fprintf(stderr, "Options:\n"); |
161 | fprintf(stderr, " -l user Log in using this user name.\n"); | |
5ca51e19 | 162 | fprintf(stderr, " -n Redirect input from " _PATH_DEVNULL ".\n"); |
71276795 | 163 | fprintf(stderr, " -A Enable authentication agent forwarding.\n"); |
63cd7dd0 | 164 | fprintf(stderr, " -a Disable authentication agent forwarding (default).\n"); |
8efc0c15 | 165 | #ifdef AFS |
5260325f | 166 | fprintf(stderr, " -k Disable Kerberos ticket and AFS token forwarding.\n"); |
167 | #endif /* AFS */ | |
2b87da3b | 168 | fprintf(stderr, " -X Enable X11 connection forwarding.\n"); |
63cd7dd0 | 169 | fprintf(stderr, " -x Disable X11 connection forwarding (default).\n"); |
a01a5f30 | 170 | fprintf(stderr, " -i file Identity for public key authentication " |
171 | "(default: ~/.ssh/identity)\n"); | |
315dfb04 | 172 | #ifdef SMARTCARD |
173 | fprintf(stderr, " -I reader Set smartcard reader.\n"); | |
dd2495cb | 174 | #endif |
5260325f | 175 | fprintf(stderr, " -t Tty; allocate a tty even if command is given.\n"); |
8ce64345 | 176 | fprintf(stderr, " -T Do not allocate a tty.\n"); |
5260325f | 177 | fprintf(stderr, " -v Verbose; display verbose debugging messages.\n"); |
bcbf86ec | 178 | fprintf(stderr, " Multiple -v increases verbosity.\n"); |
5260325f | 179 | fprintf(stderr, " -V Display version number only.\n"); |
180 | fprintf(stderr, " -P Don't allocate a privileged port.\n"); | |
181 | fprintf(stderr, " -q Quiet; don't display any warning messages.\n"); | |
182 | fprintf(stderr, " -f Fork into background after authentication.\n"); | |
183 | fprintf(stderr, " -e char Set escape character; ``none'' = disable (default: ~).\n"); | |
184 | ||
63cd7dd0 | 185 | fprintf(stderr, " -c cipher Select encryption algorithm\n"); |
38967add | 186 | fprintf(stderr, " -m macs Specify MAC algorithms for protocol version 2.\n"); |
5260325f | 187 | fprintf(stderr, " -p port Connect to this port. Server must be on the same port.\n"); |
188 | fprintf(stderr, " -L listen-port:host:port Forward local port to remote address\n"); | |
189 | fprintf(stderr, " -R listen-port:host:port Forward remote port to local address\n"); | |
1fe6a48f | 190 | fprintf(stderr, " These cause %s to listen for connections on a port, and\n", __progname); |
5260325f | 191 | fprintf(stderr, " forward them to the other side by connecting to host:port.\n"); |
192 | fprintf(stderr, " -C Enable compression.\n"); | |
8ce64345 | 193 | fprintf(stderr, " -N Do not execute a shell or command.\n"); |
5260325f | 194 | fprintf(stderr, " -g Allow remote hosts to connect to forwarded ports.\n"); |
1f3bf5aa | 195 | fprintf(stderr, " -1 Force protocol version 1.\n"); |
196 | fprintf(stderr, " -2 Force protocol version 2.\n"); | |
48e671d5 | 197 | fprintf(stderr, " -4 Use IPv4 only.\n"); |
198 | fprintf(stderr, " -6 Use IPv6 only.\n"); | |
5260325f | 199 | fprintf(stderr, " -o 'option' Process the option as if it was read from a configuration file.\n"); |
ae810de7 | 200 | fprintf(stderr, " -s Invoke command (mandatory) as SSH2 subsystem.\n"); |
63cd7dd0 | 201 | fprintf(stderr, " -b addr Local IP address.\n"); |
5260325f | 202 | exit(1); |
8efc0c15 | 203 | } |
204 | ||
5260325f | 205 | /* |
206 | * Connects to the given host using rsh (or prints an error message and exits | |
207 | * if rsh is not available). This function never returns. | |
208 | */ | |
396c147e | 209 | static void |
5260325f | 210 | rsh_connect(char *host, char *user, Buffer * command) |
8efc0c15 | 211 | { |
5260325f | 212 | char *args[10]; |
213 | int i; | |
214 | ||
215 | log("Using rsh. WARNING: Connection will not be encrypted."); | |
216 | /* Build argument list for rsh. */ | |
217 | i = 0; | |
218 | args[i++] = _PATH_RSH; | |
219 | /* host may have to come after user on some systems */ | |
220 | args[i++] = host; | |
221 | if (user) { | |
222 | args[i++] = "-l"; | |
223 | args[i++] = user; | |
224 | } | |
225 | if (buffer_len(command) > 0) { | |
226 | buffer_append(command, "\0", 1); | |
227 | args[i++] = buffer_ptr(command); | |
228 | } | |
229 | args[i++] = NULL; | |
230 | if (debug_flag) { | |
231 | for (i = 0; args[i]; i++) { | |
232 | if (i != 0) | |
233 | fprintf(stderr, " "); | |
234 | fprintf(stderr, "%s", args[i]); | |
235 | } | |
236 | fprintf(stderr, "\n"); | |
8efc0c15 | 237 | } |
5260325f | 238 | execv(_PATH_RSH, args); |
239 | perror(_PATH_RSH); | |
240 | exit(1); | |
8efc0c15 | 241 | } |
242 | ||
396c147e | 243 | static int ssh_session(void); |
244 | static int ssh_session2(void); | |
245 | static void load_public_identity_files(void); | |
8ce64345 | 246 | |
5260325f | 247 | /* |
248 | * Main program for the ssh client. | |
249 | */ | |
8efc0c15 | 250 | int |
251 | main(int ac, char **av) | |
252 | { | |
ce773142 | 253 | int i, opt, exit_status, cerr; |
57112b5a | 254 | u_short fwd_port, fwd_host_port; |
f5a1a01a | 255 | char *p, *cp, buf[256]; |
5260325f | 256 | struct stat st; |
3b1a83df | 257 | struct passwd *pw; |
8ce64345 | 258 | int dummy; |
5260325f | 259 | uid_t original_effective_uid; |
1812a662 | 260 | extern int optopt; |
261 | extern int optind; | |
262 | extern int optreset; | |
263 | extern char *optarg; | |
5260325f | 264 | |
260d427b | 265 | __progname = get_progname(av[0]); |
264dce47 | 266 | init_rng(); |
267 | ||
aa3378df | 268 | /* |
269 | * Save the original real uid. It will be needed later (uid-swapping | |
270 | * may clobber the real uid). | |
271 | */ | |
5260325f | 272 | original_real_uid = getuid(); |
273 | original_effective_uid = geteuid(); | |
274 | ||
7322ef0e | 275 | #ifdef HAVE_SETRLIMIT |
5260325f | 276 | /* If we are installed setuid root be careful to not drop core. */ |
277 | if (original_real_uid != original_effective_uid) { | |
278 | struct rlimit rlim; | |
279 | rlim.rlim_cur = rlim.rlim_max = 0; | |
280 | if (setrlimit(RLIMIT_CORE, &rlim) < 0) | |
281 | fatal("setrlimit failed: %.100s", strerror(errno)); | |
8efc0c15 | 282 | } |
3c62e7eb | 283 | #endif |
63bd8c36 | 284 | /* Get user data. */ |
285 | pw = getpwuid(original_real_uid); | |
286 | if (!pw) { | |
287 | log("You don't exist, go away!"); | |
288 | exit(1); | |
289 | } | |
290 | /* Take a copy of the returned structure. */ | |
291 | pw = pwcopy(pw); | |
292 | ||
aa3378df | 293 | /* |
294 | * Use uid-swapping to give up root privileges for the duration of | |
295 | * option processing. We will re-instantiate the rights when we are | |
296 | * ready to create the privileged port, and will permanently drop | |
297 | * them when the port has been created (actually, when the connection | |
298 | * has been made, as we may need to create the port several times). | |
299 | */ | |
63bd8c36 | 300 | temporarily_use_uid(pw); |
5260325f | 301 | |
aa3378df | 302 | /* |
303 | * Set our umask to something reasonable, as some files are created | |
304 | * with the default umask. This will make them world-readable but | |
305 | * writable only by the owner, which is ok for all files for which we | |
306 | * don't set the modes explicitly. | |
307 | */ | |
5260325f | 308 | umask(022); |
309 | ||
5260325f | 310 | /* Initialize option structure to indicate that no values have been set. */ |
311 | initialize_options(&options); | |
312 | ||
313 | /* Parse command-line arguments. */ | |
314 | host = NULL; | |
315 | ||
f5a1a01a | 316 | again: |
317 | while ((opt = getopt(ac, av, | |
1783c29f | 318 | "1246ab:c:e:fgi:kl:m:no:p:qstvxACD:I:L:NPR:TVX")) != -1) { |
5260325f | 319 | switch (opt) { |
1f3bf5aa | 320 | case '1': |
321 | options.protocol = SSH_PROTO_1; | |
322 | break; | |
6ae2364d | 323 | case '2': |
324 | options.protocol = SSH_PROTO_2; | |
325 | break; | |
48e671d5 | 326 | case '4': |
327 | IPv4or6 = AF_INET; | |
328 | break; | |
48e671d5 | 329 | case '6': |
330 | IPv4or6 = AF_INET6; | |
331 | break; | |
5260325f | 332 | case 'n': |
333 | stdin_null_flag = 1; | |
334 | break; | |
5260325f | 335 | case 'f': |
336 | fork_after_authentication_flag = 1; | |
337 | stdin_null_flag = 1; | |
338 | break; | |
5260325f | 339 | case 'x': |
340 | options.forward_x11 = 0; | |
341 | break; | |
5260325f | 342 | case 'X': |
343 | options.forward_x11 = 1; | |
344 | break; | |
5260325f | 345 | case 'g': |
346 | options.gateway_ports = 1; | |
347 | break; | |
5260325f | 348 | case 'P': |
349 | options.use_privileged_port = 0; | |
350 | break; | |
5260325f | 351 | case 'a': |
352 | options.forward_agent = 0; | |
353 | break; | |
71276795 | 354 | case 'A': |
355 | options.forward_agent = 1; | |
356 | break; | |
5260325f | 357 | #ifdef AFS |
358 | case 'k': | |
359 | options.kerberos_tgt_passing = 0; | |
360 | options.afs_token_passing = 0; | |
361 | break; | |
362 | #endif | |
363 | case 'i': | |
364 | if (stat(optarg, &st) < 0) { | |
f5a1a01a | 365 | fprintf(stderr, "Warning: Identity file %s " |
366 | "does not exist.\n", optarg); | |
5260325f | 367 | break; |
368 | } | |
f5a1a01a | 369 | if (options.num_identity_files >= |
370 | SSH_MAX_IDENTITY_FILES) | |
371 | fatal("Too many identity files specified " | |
372 | "(max %d)", SSH_MAX_IDENTITY_FILES); | |
373 | options.identity_files[options.num_identity_files++] = | |
374 | xstrdup(optarg); | |
5260325f | 375 | break; |
383546c4 | 376 | case 'I': |
377 | #ifdef SMARTCARD | |
9ff6f66f | 378 | options.smartcard_device = xstrdup(optarg); |
dd2495cb | 379 | #else |
383546c4 | 380 | fprintf(stderr, "no support for smartcards.\n"); |
dd2495cb | 381 | #endif |
383546c4 | 382 | break; |
5260325f | 383 | case 't': |
8abcdba4 | 384 | if (tty_flag) |
385 | force_tty_flag = 1; | |
5260325f | 386 | tty_flag = 1; |
387 | break; | |
5260325f | 388 | case 'v': |
bcbf86ec | 389 | if (0 == debug_flag) { |
390 | debug_flag = 1; | |
391 | options.log_level = SYSLOG_LEVEL_DEBUG1; | |
392 | } else if (options.log_level < SYSLOG_LEVEL_DEBUG3) { | |
393 | options.log_level++; | |
394 | break; | |
f5a1a01a | 395 | } else |
54b974dc | 396 | fatal("Too high debugging level."); |
bcbf86ec | 397 | /* fallthrough */ |
5260325f | 398 | case 'V': |
e68225b2 | 399 | fprintf(stderr, |
400 | "%s, SSH protocols %d.%d/%d.%d, OpenSSL 0x%8.8lx\n", | |
a8be9f80 | 401 | SSH_VERSION, |
402 | PROTOCOL_MAJOR_1, PROTOCOL_MINOR_1, | |
e68225b2 | 403 | PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2, |
404 | SSLeay()); | |
5260325f | 405 | if (opt == 'V') |
406 | exit(0); | |
5260325f | 407 | break; |
5260325f | 408 | case 'q': |
409 | options.log_level = SYSLOG_LEVEL_QUIET; | |
410 | break; | |
5260325f | 411 | case 'e': |
412 | if (optarg[0] == '^' && optarg[2] == 0 && | |
f5a1a01a | 413 | (u_char) optarg[1] >= 64 && |
414 | (u_char) optarg[1] < 128) | |
1e3b8b07 | 415 | options.escape_char = (u_char) optarg[1] & 31; |
5260325f | 416 | else if (strlen(optarg) == 1) |
1e3b8b07 | 417 | options.escape_char = (u_char) optarg[0]; |
5260325f | 418 | else if (strcmp(optarg, "none") == 0) |
4bf9c10e | 419 | options.escape_char = SSH_ESCAPECHAR_NONE; |
5260325f | 420 | else { |
f5a1a01a | 421 | fprintf(stderr, "Bad escape character '%s'.\n", |
422 | optarg); | |
5260325f | 423 | exit(1); |
424 | } | |
425 | break; | |
5260325f | 426 | case 'c': |
a306f2dd | 427 | if (ciphers_valid(optarg)) { |
428 | /* SSH2 only */ | |
429 | options.ciphers = xstrdup(optarg); | |
d0c832f3 | 430 | options.cipher = SSH_CIPHER_ILLEGAL; |
a306f2dd | 431 | } else { |
432 | /* SSH1 only */ | |
c523303b | 433 | options.cipher = cipher_number(optarg); |
434 | if (options.cipher == -1) { | |
f5a1a01a | 435 | fprintf(stderr, |
436 | "Unknown cipher type '%s'\n", | |
437 | optarg); | |
a306f2dd | 438 | exit(1); |
439 | } | |
f5a1a01a | 440 | if (options.cipher == SSH_CIPHER_3DES) |
c523303b | 441 | options.ciphers = "3des-cbc"; |
f5a1a01a | 442 | else if (options.cipher == SSH_CIPHER_BLOWFISH) |
c523303b | 443 | options.ciphers = "blowfish-cbc"; |
f5a1a01a | 444 | else |
c523303b | 445 | options.ciphers = (char *)-1; |
5260325f | 446 | } |
447 | break; | |
b2552997 | 448 | case 'm': |
449 | if (mac_valid(optarg)) | |
450 | options.macs = xstrdup(optarg); | |
451 | else { | |
f5a1a01a | 452 | fprintf(stderr, "Unknown mac type '%s'\n", |
453 | optarg); | |
b2552997 | 454 | exit(1); |
455 | } | |
456 | break; | |
5260325f | 457 | case 'p': |
2d2a2c65 | 458 | options.port = a2port(optarg); |
459 | if (options.port == 0) { | |
6031af8d | 460 | fprintf(stderr, "Bad port '%s'\n", optarg); |
461 | exit(1); | |
462 | } | |
5260325f | 463 | break; |
5260325f | 464 | case 'l': |
465 | options.user = optarg; | |
466 | break; | |
5260325f | 467 | case 'R': |
48e671d5 | 468 | if (sscanf(optarg, "%hu/%255[^/]/%hu", &fwd_port, buf, |
469 | &fwd_host_port) != 3 && | |
470 | sscanf(optarg, "%hu:%255[^:]:%hu", &fwd_port, buf, | |
471 | &fwd_host_port) != 3) { | |
f5a1a01a | 472 | fprintf(stderr, |
473 | "Bad forwarding specification '%s'.\n", | |
474 | optarg); | |
5260325f | 475 | usage(); |
476 | /* NOTREACHED */ | |
477 | } | |
f5a1a01a | 478 | add_remote_forward(&options, fwd_port, buf, |
479 | fwd_host_port); | |
5260325f | 480 | break; |
5260325f | 481 | case 'L': |
48e671d5 | 482 | if (sscanf(optarg, "%hu/%255[^/]/%hu", &fwd_port, buf, |
483 | &fwd_host_port) != 3 && | |
484 | sscanf(optarg, "%hu:%255[^:]:%hu", &fwd_port, buf, | |
485 | &fwd_host_port) != 3) { | |
f5a1a01a | 486 | fprintf(stderr, |
487 | "Bad forwarding specification '%s'.\n", | |
488 | optarg); | |
5260325f | 489 | usage(); |
490 | /* NOTREACHED */ | |
491 | } | |
f5a1a01a | 492 | add_local_forward(&options, fwd_port, buf, |
493 | fwd_host_port); | |
5260325f | 494 | break; |
0490e609 | 495 | |
496 | case 'D': | |
2d2a2c65 | 497 | fwd_port = a2port(optarg); |
498 | if (fwd_port == 0) { | |
f5a1a01a | 499 | fprintf(stderr, "Bad dynamic port '%s'\n", |
500 | optarg); | |
6031af8d | 501 | exit(1); |
502 | } | |
0490e609 | 503 | add_local_forward(&options, fwd_port, "socks4", 0); |
504 | break; | |
505 | ||
5260325f | 506 | case 'C': |
507 | options.compression = 1; | |
508 | break; | |
8ce64345 | 509 | case 'N': |
510 | no_shell_flag = 1; | |
511 | no_tty_flag = 1; | |
512 | break; | |
8ce64345 | 513 | case 'T': |
514 | no_tty_flag = 1; | |
515 | break; | |
5260325f | 516 | case 'o': |
517 | dummy = 1; | |
f5a1a01a | 518 | if (process_config_line(&options, host ? host : "", |
519 | optarg, "command-line", 0, &dummy) != 0) | |
5260325f | 520 | exit(1); |
521 | break; | |
ae810de7 | 522 | case 's': |
523 | subsystem_flag = 1; | |
524 | break; | |
3435f5a6 | 525 | case 'b': |
526 | options.bind_address = optarg; | |
527 | break; | |
5260325f | 528 | default: |
529 | usage(); | |
530 | } | |
531 | } | |
532 | ||
f5a1a01a | 533 | ac -= optind; |
534 | av += optind; | |
535 | ||
536 | if (ac > 0 && !host && **av != '-') { | |
537 | if (strchr(*av, '@')) { | |
538 | p = xstrdup(*av); | |
539 | cp = strchr(p, '@'); | |
540 | if (cp == NULL || cp == p) | |
541 | usage(); | |
542 | options.user = p; | |
543 | *cp = '\0'; | |
544 | host = ++cp; | |
545 | } else | |
546 | host = *av; | |
547 | ac--, av++; | |
548 | if (ac > 0) { | |
549 | optind = 0; | |
550 | optreset = 1; | |
551 | goto again; | |
552 | } | |
553 | } | |
554 | ||
5260325f | 555 | /* Check that we got a host name. */ |
556 | if (!host) | |
8efc0c15 | 557 | usage(); |
5260325f | 558 | |
22d89d24 | 559 | SSLeay_add_all_algorithms(); |
fa08c86b | 560 | ERR_load_crypto_strings(); |
22d89d24 | 561 | |
5260325f | 562 | /* Initialize the command to execute on remote host. */ |
563 | buffer_init(&command); | |
564 | ||
aa3378df | 565 | /* |
566 | * Save the command to execute on the remote host in a buffer. There | |
567 | * is no limit on the length of the command, except by the maximum | |
568 | * packet size. Also sets the tty flag if there is no command. | |
569 | */ | |
f5a1a01a | 570 | if (!ac) { |
5260325f | 571 | /* No command specified - execute shell on a tty. */ |
572 | tty_flag = 1; | |
ae810de7 | 573 | if (subsystem_flag) { |
f5a1a01a | 574 | fprintf(stderr, |
575 | "You must specify a subsystem to invoke.\n"); | |
ae810de7 | 576 | usage(); |
577 | } | |
5260325f | 578 | } else { |
f5a1a01a | 579 | /* A command has been specified. Store it into the buffer. */ |
580 | for (i = 0; i < ac; i++) { | |
581 | if (i) | |
5260325f | 582 | buffer_append(&command, " ", 1); |
583 | buffer_append(&command, av[i], strlen(av[i])); | |
584 | } | |
8efc0c15 | 585 | } |
5260325f | 586 | |
587 | /* Cannot fork to background if no command. */ | |
14a9a859 | 588 | if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag) |
5260325f | 589 | fatal("Cannot fork into background without a command to execute."); |
590 | ||
591 | /* Allocate a tty by default if no command specified. */ | |
592 | if (buffer_len(&command) == 0) | |
593 | tty_flag = 1; | |
594 | ||
0b6fbf03 | 595 | /* Force no tty*/ |
596 | if (no_tty_flag) | |
597 | tty_flag = 0; | |
5260325f | 598 | /* Do not allocate a tty if stdin is not a tty. */ |
8abcdba4 | 599 | if (!isatty(fileno(stdin)) && !force_tty_flag) { |
5260325f | 600 | if (tty_flag) |
54b974dc | 601 | log("Pseudo-terminal will not be allocated because stdin is not a terminal."); |
5260325f | 602 | tty_flag = 0; |
603 | } | |
8ce64345 | 604 | |
20244695 | 605 | /* |
606 | * Initialize "log" output. Since we are the client all output | |
607 | * actually goes to stderr. | |
608 | */ | |
cc44f691 | 609 | log_init(av[0], options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level, |
610 | SYSLOG_FACILITY_USER, 1); | |
5260325f | 611 | |
612 | /* Read per-user configuration file. */ | |
42f11eb2 | 613 | snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, _PATH_SSH_USER_CONFFILE); |
5260325f | 614 | read_config_file(buf, host, &options); |
615 | ||
616 | /* Read systemwide configuration file. */ | |
42f11eb2 | 617 | read_config_file(_PATH_HOST_CONFIG_FILE, host, &options); |
5260325f | 618 | |
619 | /* Fill configuration defaults. */ | |
620 | fill_default_options(&options); | |
621 | ||
622 | /* reinit */ | |
20244695 | 623 | log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 1); |
5260325f | 624 | |
e339aa53 | 625 | seed_rng(); |
626 | ||
5260325f | 627 | if (options.user == NULL) |
628 | options.user = xstrdup(pw->pw_name); | |
629 | ||
630 | if (options.hostname != NULL) | |
631 | host = options.hostname; | |
632 | ||
5260325f | 633 | /* Disable rhosts authentication if not running as root. */ |
3c62e7eb | 634 | #ifdef HAVE_CYGWIN |
635 | /* Ignore uid if running under Windows */ | |
636 | if (!options.use_privileged_port) { | |
637 | #else | |
5260325f | 638 | if (original_effective_uid != 0 || !options.use_privileged_port) { |
3c62e7eb | 639 | #endif |
6ffc9c88 | 640 | debug("Rhosts Authentication disabled, " |
641 | "originating port will not be trusted."); | |
5260325f | 642 | options.rhosts_authentication = 0; |
5260325f | 643 | } |
aa3378df | 644 | /* |
645 | * If using rsh has been selected, exec it now (without trying | |
646 | * anything else). Note that we must release privileges first. | |
647 | */ | |
5260325f | 648 | if (options.use_rsh) { |
aa3378df | 649 | /* |
650 | * Restore our superuser privileges. This must be done | |
651 | * before permanently setting the uid. | |
652 | */ | |
5260325f | 653 | restore_uid(); |
654 | ||
655 | /* Switch to the original uid permanently. */ | |
63bd8c36 | 656 | permanently_set_uid(pw); |
5260325f | 657 | |
658 | /* Execute rsh. */ | |
659 | rsh_connect(host, options.user, &command); | |
660 | fatal("rsh_connect returned"); | |
8efc0c15 | 661 | } |
5260325f | 662 | /* Restore our superuser privileges. */ |
663 | restore_uid(); | |
664 | ||
6ffc9c88 | 665 | /* Open a connection to the remote host. */ |
5260325f | 666 | |
ce773142 | 667 | cerr = ssh_connect(host, &hostaddr, options.port, |
6ffc9c88 | 668 | options.connection_attempts, |
669 | original_effective_uid != 0 || !options.use_privileged_port, | |
63bd8c36 | 670 | pw, options.proxy_command); |
5260325f | 671 | |
aa3378df | 672 | /* |
673 | * If we successfully made the connection, load the host private key | |
674 | * in case we will need it later for combined rsa-rhosts | |
675 | * authentication. This must be done before releasing extra | |
676 | * privileges, because the file is only readable by root. | |
677 | */ | |
8002af61 | 678 | sensitive_data.nkeys = 0; |
679 | sensitive_data.keys = NULL; | |
ce773142 | 680 | if (!cerr && (options.rhosts_rsa_authentication || |
8002af61 | 681 | options.hostbased_authentication)) { |
682 | sensitive_data.nkeys = 3; | |
683 | sensitive_data.keys = xmalloc(sensitive_data.nkeys*sizeof(Key)); | |
684 | sensitive_data.keys[0] = key_load_private_type(KEY_RSA1, | |
aeaa3d9e | 685 | _PATH_HOST_KEY_FILE, "", NULL); |
8002af61 | 686 | sensitive_data.keys[1] = key_load_private_type(KEY_DSA, |
687 | _PATH_HOST_DSA_KEY_FILE, "", NULL); | |
688 | sensitive_data.keys[2] = key_load_private_type(KEY_RSA, | |
689 | _PATH_HOST_RSA_KEY_FILE, "", NULL); | |
5260325f | 690 | } |
aa3378df | 691 | /* |
692 | * Get rid of any extra privileges that we may have. We will no | |
693 | * longer need them. Also, extra privileges could make it very hard | |
694 | * to read identity files and other non-world-readable files from the | |
695 | * user's home directory if it happens to be on a NFS volume where | |
696 | * root is mapped to nobody. | |
697 | */ | |
698 | ||
699 | /* | |
700 | * Note that some legacy systems need to postpone the following call | |
701 | * to permanently_set_uid() until the private hostkey is destroyed | |
702 | * with RSA_free(). Otherwise the calling user could ptrace() the | |
703 | * process, read the private hostkey and impersonate the host. | |
704 | * OpenBSD does not allow ptracing of setuid processes. | |
705 | */ | |
63bd8c36 | 706 | permanently_set_uid(pw); |
5260325f | 707 | |
aa3378df | 708 | /* |
709 | * Now that we are back to our own permissions, create ~/.ssh | |
710 | * directory if it doesn\'t already exist. | |
711 | */ | |
c3abff07 | 712 | snprintf(buf, sizeof buf, "%.100s%s%.100s", pw->pw_dir, strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR); |
5260325f | 713 | if (stat(buf, &st) < 0) |
704b1659 | 714 | if (mkdir(buf, 0700) < 0) |
5260325f | 715 | error("Could not create directory '%.200s'.", buf); |
716 | ||
717 | /* Check if the connection failed, and try "rsh" if appropriate. */ | |
ce773142 | 718 | if (cerr) { |
719 | if (!options.fallback_to_rsh) | |
720 | exit(1); | |
5260325f | 721 | if (options.port != 0) |
ce773142 | 722 | log("Secure connection to %.100s on port %hu refused; " |
723 | "reverting to insecure method", | |
724 | host, options.port); | |
5260325f | 725 | else |
ce773142 | 726 | log("Secure connection to %.100s refused; " |
727 | "reverting to insecure method.", host); | |
5260325f | 728 | |
ce773142 | 729 | rsh_connect(host, options.user, &command); |
730 | fatal("rsh_connect returned"); | |
8efc0c15 | 731 | } |
fee56204 | 732 | /* load options.identity_files */ |
733 | load_public_identity_files(); | |
734 | ||
735 | /* Expand ~ in known host file names. */ | |
736 | /* XXX mem-leaks: */ | |
fa08c86b | 737 | options.system_hostfile = |
738 | tilde_expand_filename(options.system_hostfile, original_real_uid); | |
739 | options.user_hostfile = | |
740 | tilde_expand_filename(options.user_hostfile, original_real_uid); | |
741 | options.system_hostfile2 = | |
742 | tilde_expand_filename(options.system_hostfile2, original_real_uid); | |
743 | options.user_hostfile2 = | |
744 | tilde_expand_filename(options.user_hostfile2, original_real_uid); | |
5260325f | 745 | |
746 | /* Log into the remote system. This never returns if the login fails. */ | |
8002af61 | 747 | ssh_login(sensitive_data.keys, sensitive_data.nkeys, |
748 | host, (struct sockaddr *)&hostaddr, pw); | |
749 | ||
750 | /* We no longer need the private host keys. Clear them now. */ | |
751 | if (sensitive_data.nkeys != 0) { | |
752 | for (i = 0; i < sensitive_data.nkeys; i++) { | |
753 | if (sensitive_data.keys[i] != NULL) { | |
754 | /* Destroys contents safely */ | |
755 | debug3("clear hostkey %d", i); | |
756 | key_free(sensitive_data.keys[i]); | |
757 | sensitive_data.keys[i] = NULL; | |
758 | } | |
759 | } | |
760 | xfree(sensitive_data.keys); | |
761 | } | |
05b7537a | 762 | for (i = 0; i < options.num_identity_files; i++) { |
763 | if (options.identity_files[i]) { | |
764 | xfree(options.identity_files[i]); | |
765 | options.identity_files[i] = NULL; | |
766 | } | |
767 | if (options.identity_keys[i]) { | |
768 | key_free(options.identity_keys[i]); | |
769 | options.identity_keys[i] = NULL; | |
770 | } | |
771 | } | |
5260325f | 772 | |
8ce64345 | 773 | exit_status = compat20 ? ssh_session2() : ssh_session(); |
774 | packet_close(); | |
775 | return exit_status; | |
776 | } | |
777 | ||
396c147e | 778 | static void |
0b242b12 | 779 | x11_get_proto(char *proto, int proto_len, char *data, int data_len) |
780 | { | |
781 | char line[512]; | |
782 | FILE *f; | |
783 | int got_data = 0, i; | |
784 | ||
fa649821 | 785 | if (options.xauth_location) { |
786 | /* Try to get Xauthority information for the display. */ | |
5ca51e19 | 787 | snprintf(line, sizeof line, "%.100s list %.200s 2>" _PATH_DEVNULL, |
fa649821 | 788 | options.xauth_location, getenv("DISPLAY")); |
789 | f = popen(line, "r"); | |
790 | if (f && fgets(line, sizeof(line), f) && | |
791 | sscanf(line, "%*s %s %s", proto, data) == 2) | |
792 | got_data = 1; | |
793 | if (f) | |
794 | pclose(f); | |
795 | } | |
0b242b12 | 796 | /* |
797 | * If we didn't get authentication data, just make up some | |
798 | * data. The forwarding code will check the validity of the | |
799 | * response anyway, and substitute this data. The X11 | |
800 | * server, however, will ignore this fake data and use | |
801 | * whatever authentication mechanisms it was using otherwise | |
802 | * for the local connection. | |
803 | */ | |
804 | if (!got_data) { | |
805 | u_int32_t rand = 0; | |
806 | ||
807 | strlcpy(proto, "MIT-MAGIC-COOKIE-1", proto_len); | |
808 | for (i = 0; i < 16; i++) { | |
809 | if (i % 4 == 0) | |
810 | rand = arc4random(); | |
811 | snprintf(data + 2 * i, data_len - 2 * i, "%02x", rand & 0xff); | |
812 | rand >>= 8; | |
813 | } | |
814 | } | |
815 | } | |
816 | ||
396c147e | 817 | static void |
fa08c86b | 818 | ssh_init_forwarding(void) |
819 | { | |
02a024dd | 820 | int success = 0; |
fa08c86b | 821 | int i; |
02a024dd | 822 | |
fa08c86b | 823 | /* Initiate local TCP/IP port forwardings. */ |
824 | for (i = 0; i < options.num_local_forwards; i++) { | |
825 | debug("Connections to local port %d forwarded to remote address %.200s:%d", | |
826 | options.local_forwards[i].port, | |
827 | options.local_forwards[i].host, | |
828 | options.local_forwards[i].host_port); | |
02a024dd | 829 | success += channel_request_local_forwarding( |
fa08c86b | 830 | options.local_forwards[i].port, |
831 | options.local_forwards[i].host, | |
832 | options.local_forwards[i].host_port, | |
833 | options.gateway_ports); | |
834 | } | |
02a024dd | 835 | if (i > 0 && success == 0) |
836 | error("Could not request local forwarding."); | |
fa08c86b | 837 | |
838 | /* Initiate remote TCP/IP port forwardings. */ | |
839 | for (i = 0; i < options.num_remote_forwards; i++) { | |
840 | debug("Connections to remote port %d forwarded to local address %.200s:%d", | |
841 | options.remote_forwards[i].port, | |
842 | options.remote_forwards[i].host, | |
843 | options.remote_forwards[i].host_port); | |
844 | channel_request_remote_forwarding( | |
845 | options.remote_forwards[i].port, | |
846 | options.remote_forwards[i].host, | |
847 | options.remote_forwards[i].host_port); | |
848 | } | |
849 | } | |
850 | ||
396c147e | 851 | static void |
fa08c86b | 852 | check_agent_present(void) |
853 | { | |
854 | if (options.forward_agent) { | |
855 | /* Clear agent forwarding if we don\'t have an agent. */ | |
856 | int authfd = ssh_get_authentication_socket(); | |
857 | if (authfd < 0) | |
858 | options.forward_agent = 0; | |
859 | else | |
860 | ssh_close_authentication_socket(authfd); | |
861 | } | |
862 | } | |
863 | ||
396c147e | 864 | static int |
8ce64345 | 865 | ssh_session(void) |
866 | { | |
867 | int type; | |
8ce64345 | 868 | int plen; |
869 | int interactive = 0; | |
870 | int have_tty = 0; | |
871 | struct winsize ws; | |
8ce64345 | 872 | char *cp; |
873 | ||
5260325f | 874 | /* Enable compression if requested. */ |
875 | if (options.compression) { | |
876 | debug("Requesting compression at level %d.", options.compression_level); | |
877 | ||
878 | if (options.compression_level < 1 || options.compression_level > 9) | |
879 | fatal("Compression level must be from 1 (fast) to 9 (slow, best)."); | |
880 | ||
881 | /* Send the request. */ | |
882 | packet_start(SSH_CMSG_REQUEST_COMPRESSION); | |
883 | packet_put_int(options.compression_level); | |
884 | packet_send(); | |
885 | packet_write_wait(); | |
886 | type = packet_read(&plen); | |
887 | if (type == SSH_SMSG_SUCCESS) | |
888 | packet_start_compression(options.compression_level); | |
889 | else if (type == SSH_SMSG_FAILURE) | |
890 | log("Warning: Remote host refused compression."); | |
891 | else | |
892 | packet_disconnect("Protocol error waiting for compression response."); | |
893 | } | |
894 | /* Allocate a pseudo tty if appropriate. */ | |
895 | if (tty_flag) { | |
896 | debug("Requesting pty."); | |
897 | ||
898 | /* Start the packet. */ | |
899 | packet_start(SSH_CMSG_REQUEST_PTY); | |
900 | ||
901 | /* Store TERM in the packet. There is no limit on the | |
902 | length of the string. */ | |
903 | cp = getenv("TERM"); | |
904 | if (!cp) | |
905 | cp = ""; | |
449c5ba5 | 906 | packet_put_cstring(cp); |
5260325f | 907 | |
908 | /* Store window size in the packet. */ | |
909 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) | |
910 | memset(&ws, 0, sizeof(ws)); | |
911 | packet_put_int(ws.ws_row); | |
912 | packet_put_int(ws.ws_col); | |
913 | packet_put_int(ws.ws_xpixel); | |
914 | packet_put_int(ws.ws_ypixel); | |
915 | ||
916 | /* Store tty modes in the packet. */ | |
30dcc918 | 917 | tty_make_modes(fileno(stdin), NULL); |
5260325f | 918 | |
919 | /* Send the packet, and wait for it to leave. */ | |
920 | packet_send(); | |
921 | packet_write_wait(); | |
922 | ||
923 | /* Read response from the server. */ | |
924 | type = packet_read(&plen); | |
4fe2af09 | 925 | if (type == SSH_SMSG_SUCCESS) { |
5260325f | 926 | interactive = 1; |
8ce64345 | 927 | have_tty = 1; |
4fe2af09 | 928 | } else if (type == SSH_SMSG_FAILURE) |
5260325f | 929 | log("Warning: Remote host failed or refused to allocate a pseudo tty."); |
930 | else | |
931 | packet_disconnect("Protocol error waiting for pty request response."); | |
932 | } | |
933 | /* Request X11 forwarding if enabled and DISPLAY is set. */ | |
934 | if (options.forward_x11 && getenv("DISPLAY") != NULL) { | |
0b242b12 | 935 | char proto[512], data[512]; |
936 | /* Get reasonable local authentication information. */ | |
937 | x11_get_proto(proto, sizeof proto, data, sizeof data); | |
938 | /* Request forwarding with authentication spoofing. */ | |
5260325f | 939 | debug("Requesting X11 forwarding with authentication spoofing."); |
0b242b12 | 940 | x11_request_forwarding_with_spoofing(0, proto, data); |
5260325f | 941 | |
942 | /* Read response from the server. */ | |
943 | type = packet_read(&plen); | |
944 | if (type == SSH_SMSG_SUCCESS) { | |
5260325f | 945 | interactive = 1; |
0b242b12 | 946 | } else if (type == SSH_SMSG_FAILURE) { |
5260325f | 947 | log("Warning: Remote host denied X11 forwarding."); |
0b242b12 | 948 | } else { |
5260325f | 949 | packet_disconnect("Protocol error waiting for X11 forwarding"); |
0b242b12 | 950 | } |
5260325f | 951 | } |
952 | /* Tell the packet module whether this is an interactive session. */ | |
b5c334cc | 953 | packet_set_interactive(interactive); |
5260325f | 954 | |
955 | /* Request authentication agent forwarding if appropriate. */ | |
fa08c86b | 956 | check_agent_present(); |
957 | ||
5260325f | 958 | if (options.forward_agent) { |
959 | debug("Requesting authentication agent forwarding."); | |
960 | auth_request_forwarding(); | |
961 | ||
962 | /* Read response from the server. */ | |
963 | type = packet_read(&plen); | |
964 | packet_integrity_check(plen, 0, type); | |
965 | if (type != SSH_SMSG_SUCCESS) | |
966 | log("Warning: Remote host denied authentication agent forwarding."); | |
967 | } | |
8efc0c15 | 968 | |
fa08c86b | 969 | /* Initiate port forwardings. */ |
970 | ssh_init_forwarding(); | |
5260325f | 971 | |
aa3378df | 972 | /* If requested, let ssh continue in the background. */ |
6ae2364d | 973 | if (fork_after_authentication_flag) |
aa3378df | 974 | if (daemon(1, 1) < 0) |
975 | fatal("daemon() failed: %.200s", strerror(errno)); | |
976 | ||
977 | /* | |
978 | * If a command was specified on the command line, execute the | |
979 | * command now. Otherwise request the server to start a shell. | |
980 | */ | |
5260325f | 981 | if (buffer_len(&command) > 0) { |
982 | int len = buffer_len(&command); | |
983 | if (len > 900) | |
984 | len = 900; | |
985 | debug("Sending command: %.*s", len, buffer_ptr(&command)); | |
986 | packet_start(SSH_CMSG_EXEC_CMD); | |
987 | packet_put_string(buffer_ptr(&command), buffer_len(&command)); | |
988 | packet_send(); | |
989 | packet_write_wait(); | |
990 | } else { | |
991 | debug("Requesting shell."); | |
992 | packet_start(SSH_CMSG_EXEC_SHELL); | |
993 | packet_send(); | |
994 | packet_write_wait(); | |
995 | } | |
996 | ||
997 | /* Enter the interactive session. */ | |
4bf9c10e | 998 | return client_loop(have_tty, tty_flag ? |
999 | options.escape_char : SSH_ESCAPECHAR_NONE, 0); | |
8ce64345 | 1000 | } |
5260325f | 1001 | |
396c147e | 1002 | static void |
1f3bf5aa | 1003 | client_subsystem_reply(int type, int plen, void *ctxt) |
1004 | { | |
1005 | int id, len; | |
1006 | ||
1007 | id = packet_get_int(); | |
1008 | len = buffer_len(&command); | |
ce91d6f8 | 1009 | if (len > 900) |
1010 | len = 900; | |
1f3bf5aa | 1011 | packet_done(); |
1012 | if (type == SSH2_MSG_CHANNEL_FAILURE) | |
1013 | fatal("Request for subsystem '%.*s' failed on channel %d", | |
1014 | len, buffer_ptr(&command), id); | |
1015 | } | |
1016 | ||
396c147e | 1017 | static void |
fa08c86b | 1018 | ssh_session2_callback(int id, void *arg) |
8ce64345 | 1019 | { |
1020 | int len; | |
b5c334cc | 1021 | int interactive = 0; |
30dcc918 | 1022 | struct termios tio; |
b5c334cc | 1023 | |
6a416424 | 1024 | debug("client_init id %d arg %ld", id, (long)arg); |
8ce64345 | 1025 | |
8ce64345 | 1026 | if (tty_flag) { |
1027 | struct winsize ws; | |
1028 | char *cp; | |
1029 | cp = getenv("TERM"); | |
1030 | if (!cp) | |
1031 | cp = ""; | |
1032 | /* Store window size in the packet. */ | |
1033 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) | |
1034 | memset(&ws, 0, sizeof(ws)); | |
1035 | ||
1036 | channel_request_start(id, "pty-req", 0); | |
1037 | packet_put_cstring(cp); | |
1038 | packet_put_int(ws.ws_col); | |
1039 | packet_put_int(ws.ws_row); | |
1040 | packet_put_int(ws.ws_xpixel); | |
1041 | packet_put_int(ws.ws_ypixel); | |
30dcc918 | 1042 | tio = get_saved_tio(); |
1043 | tty_make_modes(/*ignored*/ 0, &tio); | |
8ce64345 | 1044 | packet_send(); |
b5c334cc | 1045 | interactive = 1; |
8ce64345 | 1046 | /* XXX wait for reply */ |
1047 | } | |
0b242b12 | 1048 | if (options.forward_x11 && |
1049 | getenv("DISPLAY") != NULL) { | |
1050 | char proto[512], data[512]; | |
1051 | /* Get reasonable local authentication information. */ | |
1052 | x11_get_proto(proto, sizeof proto, data, sizeof data); | |
1053 | /* Request forwarding with authentication spoofing. */ | |
1054 | debug("Requesting X11 forwarding with authentication spoofing."); | |
1055 | x11_request_forwarding_with_spoofing(id, proto, data); | |
b5c334cc | 1056 | interactive = 1; |
0b242b12 | 1057 | /* XXX wait for reply */ |
1058 | } | |
1059 | ||
fa08c86b | 1060 | check_agent_present(); |
1061 | if (options.forward_agent) { | |
1062 | debug("Requesting authentication agent forwarding."); | |
1063 | channel_request_start(id, "auth-agent-req@openssh.com", 0); | |
1064 | packet_send(); | |
1065 | } | |
1066 | ||
8ce64345 | 1067 | len = buffer_len(&command); |
1068 | if (len > 0) { | |
1069 | if (len > 900) | |
1070 | len = 900; | |
ae810de7 | 1071 | if (subsystem_flag) { |
1072 | debug("Sending subsystem: %.*s", len, buffer_ptr(&command)); | |
1f3bf5aa | 1073 | channel_request_start(id, "subsystem", /*want reply*/ 1); |
1074 | /* register callback for reply */ | |
1075 | /* XXX we asume that client_loop has already been called */ | |
1076 | dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &client_subsystem_reply); | |
1077 | dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &client_subsystem_reply); | |
ae810de7 | 1078 | } else { |
1079 | debug("Sending command: %.*s", len, buffer_ptr(&command)); | |
1080 | channel_request_start(id, "exec", 0); | |
1081 | } | |
ce91d6f8 | 1082 | packet_put_string(buffer_ptr(&command), buffer_len(&command)); |
8ce64345 | 1083 | packet_send(); |
1084 | } else { | |
1085 | channel_request(id, "shell", 0); | |
1086 | } | |
1087 | /* channel_callback(id, SSH2_MSG_OPEN_CONFIGMATION, client_init, 0); */ | |
1f3bf5aa | 1088 | |
8ce64345 | 1089 | /* register different callback, etc. XXX */ |
b5c334cc | 1090 | packet_set_interactive(interactive); |
8ce64345 | 1091 | } |
1092 | ||
396c147e | 1093 | static int |
eb0dd41f | 1094 | ssh_session2_command(void) |
8ce64345 | 1095 | { |
719fc62f | 1096 | Channel *c; |
1097 | int window, packetmax, in, out, err; | |
2e73a022 | 1098 | |
14a9a859 | 1099 | if (stdin_null_flag) { |
5ca51e19 | 1100 | in = open(_PATH_DEVNULL, O_RDONLY); |
14a9a859 | 1101 | } else { |
1102 | in = dup(STDIN_FILENO); | |
1103 | } | |
2e73a022 | 1104 | out = dup(STDOUT_FILENO); |
1105 | err = dup(STDERR_FILENO); | |
8ce64345 | 1106 | |
1107 | if (in < 0 || out < 0 || err < 0) | |
14a9a859 | 1108 | fatal("dup() in/out/err failed"); |
8ce64345 | 1109 | |
a22aff1f | 1110 | /* enable nonblocking unless tty */ |
1111 | if (!isatty(in)) | |
1112 | set_nonblock(in); | |
1113 | if (!isatty(out)) | |
1114 | set_nonblock(out); | |
1115 | if (!isatty(err)) | |
1116 | set_nonblock(err); | |
1117 | ||
bcbf86ec | 1118 | window = CHAN_SES_WINDOW_DEFAULT; |
1119 | packetmax = CHAN_SES_PACKET_DEFAULT; | |
1120 | if (!tty_flag) { | |
8ce64345 | 1121 | window *= 2; |
bcbf86ec | 1122 | packetmax *=2; |
8ce64345 | 1123 | } |
719fc62f | 1124 | c = channel_new( |
8ce64345 | 1125 | "session", SSH_CHANNEL_OPENING, in, out, err, |
bcbf86ec | 1126 | window, packetmax, CHAN_EXTENDED_WRITE, |
a22aff1f | 1127 | xstrdup("client-session"), /*nonblock*/0); |
719fc62f | 1128 | if (c == NULL) |
1129 | fatal("ssh_session2_command: channel_new failed"); | |
8ce64345 | 1130 | |
719fc62f | 1131 | debug3("ssh_session2_command: channel_new: %d", c->self); |
eb0dd41f | 1132 | |
36e1f6a1 | 1133 | channel_send_open(c->self); |
719fc62f | 1134 | channel_register_callback(c->self, SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, |
fa08c86b | 1135 | ssh_session2_callback, (void *)0); |
5260325f | 1136 | |
719fc62f | 1137 | return c->self; |
eb0dd41f | 1138 | } |
1139 | ||
396c147e | 1140 | static int |
eb0dd41f | 1141 | ssh_session2(void) |
1142 | { | |
1143 | int id; | |
1144 | ||
1145 | /* XXX should be pre-session */ | |
1146 | ssh_init_forwarding(); | |
1147 | ||
1148 | id = no_shell_flag ? -1 : ssh_session2_command(); | |
1149 | ||
1150 | /* If requested, let ssh continue in the background. */ | |
1151 | if (fork_after_authentication_flag) | |
1152 | if (daemon(1, 1) < 0) | |
1153 | fatal("daemon() failed: %.200s", strerror(errno)); | |
1154 | ||
4bf9c10e | 1155 | return client_loop(tty_flag, tty_flag ? |
1156 | options.escape_char : SSH_ESCAPECHAR_NONE, id); | |
8efc0c15 | 1157 | } |
fa08c86b | 1158 | |
396c147e | 1159 | static void |
fee56204 | 1160 | load_public_identity_files(void) |
1161 | { | |
1162 | char *filename; | |
1163 | Key *public; | |
2e23cde0 | 1164 | int i = 0; |
fee56204 | 1165 | |
383546c4 | 1166 | #ifdef SMARTCARD |
9ff6f66f | 1167 | if (options.smartcard_device != NULL && |
383546c4 | 1168 | options.num_identity_files + 1 < SSH_MAX_IDENTITY_FILES && |
eea098a3 | 1169 | (public = sc_get_key(options.smartcard_device)) != NULL ) { |
383546c4 | 1170 | Key *new; |
1171 | ||
2e23cde0 | 1172 | if (options.num_identity_files + 2 > SSH_MAX_IDENTITY_FILES) |
1173 | options.num_identity_files = SSH_MAX_IDENTITY_FILES - 2; | |
1174 | memmove(&options.identity_files[2], &options.identity_files[0], | |
1175 | sizeof(char *) * options.num_identity_files); | |
1176 | options.num_identity_files += 2; | |
1177 | i = 2; | |
1178 | ||
383546c4 | 1179 | /* XXX ssh1 vs ssh2 */ |
1180 | new = key_new(KEY_RSA); | |
1181 | new->flags = KEY_FLAG_EXT; | |
1182 | BN_copy(new->rsa->n, public->rsa->n); | |
1183 | BN_copy(new->rsa->e, public->rsa->e); | |
1184 | RSA_set_method(new->rsa, sc_get_engine()); | |
2e23cde0 | 1185 | options.identity_keys[0] = new; |
1186 | options.identity_files[0] = xstrdup("smartcard rsa key");; | |
383546c4 | 1187 | |
1188 | new = key_new(KEY_RSA1); | |
1189 | new->flags = KEY_FLAG_EXT; | |
1190 | BN_copy(new->rsa->n, public->rsa->n); | |
1191 | BN_copy(new->rsa->e, public->rsa->e); | |
1192 | RSA_set_method(new->rsa, sc_get_engine()); | |
2e23cde0 | 1193 | options.identity_keys[1] = new; |
1194 | options.identity_files[1] = xstrdup("smartcard rsa1 key"); | |
383546c4 | 1195 | |
1196 | key_free(public); | |
1197 | } | |
3e984472 | 1198 | #endif /* SMARTCARD */ |
2e23cde0 | 1199 | for (; i < options.num_identity_files; i++) { |
1200 | filename = tilde_expand_filename(options.identity_files[i], | |
1201 | original_real_uid); | |
1202 | public = key_load_public(filename, NULL); | |
1203 | debug("identity file %s type %d", filename, | |
1204 | public ? public->type : -1); | |
1205 | xfree(options.identity_files[i]); | |
1206 | options.identity_files[i] = filename; | |
1207 | options.identity_keys[i] = public; | |
1208 | } | |
fee56204 | 1209 | } |