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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" | |
ce773142 | 42 | RCSID("$OpenBSD: ssh.c,v 1.130 2001/07/25 14:35:18 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" | |
75 | #endif | |
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 | ||
383546c4 | 154 | #ifdef SMARTCARD |
155 | /* Smartcard reader id */ | |
156 | int sc_reader_num = -1; | |
157 | #endif | |
158 | ||
8efc0c15 | 159 | /* Prints a help message to the user. This function never returns. */ |
160 | ||
396c147e | 161 | static void |
5ca51e19 | 162 | usage(void) |
8efc0c15 | 163 | { |
1fe6a48f | 164 | fprintf(stderr, "Usage: %s [options] host [command]\n", __progname); |
5260325f | 165 | fprintf(stderr, "Options:\n"); |
166 | fprintf(stderr, " -l user Log in using this user name.\n"); | |
5ca51e19 | 167 | fprintf(stderr, " -n Redirect input from " _PATH_DEVNULL ".\n"); |
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"); | |
5260325f | 177 | fprintf(stderr, " -t Tty; allocate a tty even if command is given.\n"); |
8ce64345 | 178 | fprintf(stderr, " -T Do not allocate a tty.\n"); |
5260325f | 179 | fprintf(stderr, " -v Verbose; display verbose debugging messages.\n"); |
bcbf86ec | 180 | fprintf(stderr, " Multiple -v increases verbosity.\n"); |
5260325f | 181 | fprintf(stderr, " -V Display version number only.\n"); |
182 | fprintf(stderr, " -P Don't allocate a privileged port.\n"); | |
183 | fprintf(stderr, " -q Quiet; don't display any warning messages.\n"); | |
184 | fprintf(stderr, " -f Fork into background after authentication.\n"); | |
185 | fprintf(stderr, " -e char Set escape character; ``none'' = disable (default: ~).\n"); | |
186 | ||
63cd7dd0 | 187 | fprintf(stderr, " -c cipher Select encryption algorithm\n"); |
38967add | 188 | fprintf(stderr, " -m macs Specify MAC algorithms for protocol version 2.\n"); |
5260325f | 189 | fprintf(stderr, " -p port Connect to this port. Server must be on the same port.\n"); |
190 | fprintf(stderr, " -L listen-port:host:port Forward local port to remote address\n"); | |
191 | fprintf(stderr, " -R listen-port:host:port Forward remote port to local address\n"); | |
1fe6a48f | 192 | fprintf(stderr, " These cause %s to listen for connections on a port, and\n", __progname); |
5260325f | 193 | fprintf(stderr, " forward them to the other side by connecting to host:port.\n"); |
194 | fprintf(stderr, " -C Enable compression.\n"); | |
8ce64345 | 195 | fprintf(stderr, " -N Do not execute a shell or command.\n"); |
5260325f | 196 | fprintf(stderr, " -g Allow remote hosts to connect to forwarded ports.\n"); |
1f3bf5aa | 197 | fprintf(stderr, " -1 Force protocol version 1.\n"); |
198 | fprintf(stderr, " -2 Force protocol version 2.\n"); | |
48e671d5 | 199 | fprintf(stderr, " -4 Use IPv4 only.\n"); |
200 | fprintf(stderr, " -6 Use IPv6 only.\n"); | |
5260325f | 201 | fprintf(stderr, " -o 'option' Process the option as if it was read from a configuration file.\n"); |
ae810de7 | 202 | fprintf(stderr, " -s Invoke command (mandatory) as SSH2 subsystem.\n"); |
63cd7dd0 | 203 | fprintf(stderr, " -b addr Local IP address.\n"); |
5260325f | 204 | exit(1); |
8efc0c15 | 205 | } |
206 | ||
5260325f | 207 | /* |
208 | * Connects to the given host using rsh (or prints an error message and exits | |
209 | * if rsh is not available). This function never returns. | |
210 | */ | |
396c147e | 211 | static void |
5260325f | 212 | rsh_connect(char *host, char *user, Buffer * command) |
8efc0c15 | 213 | { |
5260325f | 214 | char *args[10]; |
215 | int i; | |
216 | ||
217 | log("Using rsh. WARNING: Connection will not be encrypted."); | |
218 | /* Build argument list for rsh. */ | |
219 | i = 0; | |
220 | args[i++] = _PATH_RSH; | |
221 | /* host may have to come after user on some systems */ | |
222 | args[i++] = host; | |
223 | if (user) { | |
224 | args[i++] = "-l"; | |
225 | args[i++] = user; | |
226 | } | |
227 | if (buffer_len(command) > 0) { | |
228 | buffer_append(command, "\0", 1); | |
229 | args[i++] = buffer_ptr(command); | |
230 | } | |
231 | args[i++] = NULL; | |
232 | if (debug_flag) { | |
233 | for (i = 0; args[i]; i++) { | |
234 | if (i != 0) | |
235 | fprintf(stderr, " "); | |
236 | fprintf(stderr, "%s", args[i]); | |
237 | } | |
238 | fprintf(stderr, "\n"); | |
8efc0c15 | 239 | } |
5260325f | 240 | execv(_PATH_RSH, args); |
241 | perror(_PATH_RSH); | |
242 | exit(1); | |
8efc0c15 | 243 | } |
244 | ||
396c147e | 245 | static int ssh_session(void); |
246 | static int ssh_session2(void); | |
247 | static void load_public_identity_files(void); | |
8ce64345 | 248 | |
5260325f | 249 | /* |
250 | * Main program for the ssh client. | |
251 | */ | |
8efc0c15 | 252 | int |
253 | main(int ac, char **av) | |
254 | { | |
ce773142 | 255 | int i, opt, exit_status, cerr; |
57112b5a | 256 | u_short fwd_port, fwd_host_port; |
f5a1a01a | 257 | char *p, *cp, buf[256]; |
5260325f | 258 | struct stat st; |
3b1a83df | 259 | struct passwd *pw; |
8ce64345 | 260 | int dummy; |
5260325f | 261 | uid_t original_effective_uid; |
1812a662 | 262 | extern int optopt; |
263 | extern int optind; | |
264 | extern int optreset; | |
265 | extern char *optarg; | |
5260325f | 266 | |
260d427b | 267 | __progname = get_progname(av[0]); |
264dce47 | 268 | init_rng(); |
269 | ||
aa3378df | 270 | /* |
271 | * Save the original real uid. It will be needed later (uid-swapping | |
272 | * may clobber the real uid). | |
273 | */ | |
5260325f | 274 | original_real_uid = getuid(); |
275 | original_effective_uid = geteuid(); | |
276 | ||
7322ef0e | 277 | #ifdef HAVE_SETRLIMIT |
5260325f | 278 | /* If we are installed setuid root be careful to not drop core. */ |
279 | if (original_real_uid != original_effective_uid) { | |
280 | struct rlimit rlim; | |
281 | rlim.rlim_cur = rlim.rlim_max = 0; | |
282 | if (setrlimit(RLIMIT_CORE, &rlim) < 0) | |
283 | fatal("setrlimit failed: %.100s", strerror(errno)); | |
8efc0c15 | 284 | } |
3c62e7eb | 285 | #endif |
63bd8c36 | 286 | /* Get user data. */ |
287 | pw = getpwuid(original_real_uid); | |
288 | if (!pw) { | |
289 | log("You don't exist, go away!"); | |
290 | exit(1); | |
291 | } | |
292 | /* Take a copy of the returned structure. */ | |
293 | pw = pwcopy(pw); | |
294 | ||
aa3378df | 295 | /* |
296 | * Use uid-swapping to give up root privileges for the duration of | |
297 | * option processing. We will re-instantiate the rights when we are | |
298 | * ready to create the privileged port, and will permanently drop | |
299 | * them when the port has been created (actually, when the connection | |
300 | * has been made, as we may need to create the port several times). | |
301 | */ | |
63bd8c36 | 302 | temporarily_use_uid(pw); |
5260325f | 303 | |
aa3378df | 304 | /* |
305 | * Set our umask to something reasonable, as some files are created | |
306 | * with the default umask. This will make them world-readable but | |
307 | * writable only by the owner, which is ok for all files for which we | |
308 | * don't set the modes explicitly. | |
309 | */ | |
5260325f | 310 | umask(022); |
311 | ||
5260325f | 312 | /* Initialize option structure to indicate that no values have been set. */ |
313 | initialize_options(&options); | |
314 | ||
315 | /* Parse command-line arguments. */ | |
316 | host = NULL; | |
317 | ||
f5a1a01a | 318 | again: |
319 | while ((opt = getopt(ac, av, | |
1783c29f | 320 | "1246ab:c:e:fgi:kl:m:no:p:qstvxACD:I:L:NPR:TVX")) != -1) { |
5260325f | 321 | switch (opt) { |
1f3bf5aa | 322 | case '1': |
323 | options.protocol = SSH_PROTO_1; | |
324 | break; | |
6ae2364d | 325 | case '2': |
326 | options.protocol = SSH_PROTO_2; | |
327 | break; | |
48e671d5 | 328 | case '4': |
329 | IPv4or6 = AF_INET; | |
330 | break; | |
48e671d5 | 331 | case '6': |
332 | IPv4or6 = AF_INET6; | |
333 | break; | |
5260325f | 334 | case 'n': |
335 | stdin_null_flag = 1; | |
336 | break; | |
5260325f | 337 | case 'f': |
338 | fork_after_authentication_flag = 1; | |
339 | stdin_null_flag = 1; | |
340 | break; | |
5260325f | 341 | case 'x': |
342 | options.forward_x11 = 0; | |
343 | break; | |
5260325f | 344 | case 'X': |
345 | options.forward_x11 = 1; | |
346 | break; | |
5260325f | 347 | case 'g': |
348 | options.gateway_ports = 1; | |
349 | break; | |
5260325f | 350 | case 'P': |
351 | options.use_privileged_port = 0; | |
352 | break; | |
5260325f | 353 | case 'a': |
354 | options.forward_agent = 0; | |
355 | break; | |
71276795 | 356 | case 'A': |
357 | options.forward_agent = 1; | |
358 | break; | |
5260325f | 359 | #ifdef AFS |
360 | case 'k': | |
361 | options.kerberos_tgt_passing = 0; | |
362 | options.afs_token_passing = 0; | |
363 | break; | |
364 | #endif | |
365 | case 'i': | |
366 | if (stat(optarg, &st) < 0) { | |
f5a1a01a | 367 | fprintf(stderr, "Warning: Identity file %s " |
368 | "does not exist.\n", optarg); | |
5260325f | 369 | break; |
370 | } | |
f5a1a01a | 371 | if (options.num_identity_files >= |
372 | SSH_MAX_IDENTITY_FILES) | |
373 | fatal("Too many identity files specified " | |
374 | "(max %d)", SSH_MAX_IDENTITY_FILES); | |
375 | options.identity_files[options.num_identity_files++] = | |
376 | xstrdup(optarg); | |
5260325f | 377 | break; |
383546c4 | 378 | case 'I': |
379 | #ifdef SMARTCARD | |
380 | sc_reader_num = atoi(optarg); | |
381 | #else | |
382 | fprintf(stderr, "no support for smartcards.\n"); | |
383 | #endif | |
384 | break; | |
5260325f | 385 | case 't': |
8abcdba4 | 386 | if (tty_flag) |
387 | force_tty_flag = 1; | |
5260325f | 388 | tty_flag = 1; |
389 | break; | |
5260325f | 390 | case 'v': |
bcbf86ec | 391 | if (0 == debug_flag) { |
392 | debug_flag = 1; | |
393 | options.log_level = SYSLOG_LEVEL_DEBUG1; | |
394 | } else if (options.log_level < SYSLOG_LEVEL_DEBUG3) { | |
395 | options.log_level++; | |
396 | break; | |
f5a1a01a | 397 | } else |
54b974dc | 398 | fatal("Too high debugging level."); |
bcbf86ec | 399 | /* fallthrough */ |
5260325f | 400 | case 'V': |
e68225b2 | 401 | fprintf(stderr, |
402 | "%s, SSH protocols %d.%d/%d.%d, OpenSSL 0x%8.8lx\n", | |
a8be9f80 | 403 | SSH_VERSION, |
404 | PROTOCOL_MAJOR_1, PROTOCOL_MINOR_1, | |
e68225b2 | 405 | PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2, |
406 | SSLeay()); | |
5260325f | 407 | if (opt == 'V') |
408 | exit(0); | |
5260325f | 409 | break; |
5260325f | 410 | case 'q': |
411 | options.log_level = SYSLOG_LEVEL_QUIET; | |
412 | break; | |
5260325f | 413 | case 'e': |
414 | if (optarg[0] == '^' && optarg[2] == 0 && | |
f5a1a01a | 415 | (u_char) optarg[1] >= 64 && |
416 | (u_char) optarg[1] < 128) | |
1e3b8b07 | 417 | options.escape_char = (u_char) optarg[1] & 31; |
5260325f | 418 | else if (strlen(optarg) == 1) |
1e3b8b07 | 419 | options.escape_char = (u_char) optarg[0]; |
5260325f | 420 | else if (strcmp(optarg, "none") == 0) |
4bf9c10e | 421 | options.escape_char = SSH_ESCAPECHAR_NONE; |
5260325f | 422 | else { |
f5a1a01a | 423 | fprintf(stderr, "Bad escape character '%s'.\n", |
424 | optarg); | |
5260325f | 425 | exit(1); |
426 | } | |
427 | break; | |
5260325f | 428 | case 'c': |
a306f2dd | 429 | if (ciphers_valid(optarg)) { |
430 | /* SSH2 only */ | |
431 | options.ciphers = xstrdup(optarg); | |
d0c832f3 | 432 | options.cipher = SSH_CIPHER_ILLEGAL; |
a306f2dd | 433 | } else { |
434 | /* SSH1 only */ | |
c523303b | 435 | options.cipher = cipher_number(optarg); |
436 | if (options.cipher == -1) { | |
f5a1a01a | 437 | fprintf(stderr, |
438 | "Unknown cipher type '%s'\n", | |
439 | optarg); | |
a306f2dd | 440 | exit(1); |
441 | } | |
f5a1a01a | 442 | if (options.cipher == SSH_CIPHER_3DES) |
c523303b | 443 | options.ciphers = "3des-cbc"; |
f5a1a01a | 444 | else if (options.cipher == SSH_CIPHER_BLOWFISH) |
c523303b | 445 | options.ciphers = "blowfish-cbc"; |
f5a1a01a | 446 | else |
c523303b | 447 | options.ciphers = (char *)-1; |
5260325f | 448 | } |
449 | break; | |
b2552997 | 450 | case 'm': |
451 | if (mac_valid(optarg)) | |
452 | options.macs = xstrdup(optarg); | |
453 | else { | |
f5a1a01a | 454 | fprintf(stderr, "Unknown mac type '%s'\n", |
455 | optarg); | |
b2552997 | 456 | exit(1); |
457 | } | |
458 | break; | |
5260325f | 459 | case 'p': |
2d2a2c65 | 460 | options.port = a2port(optarg); |
461 | if (options.port == 0) { | |
6031af8d | 462 | fprintf(stderr, "Bad port '%s'\n", optarg); |
463 | exit(1); | |
464 | } | |
5260325f | 465 | break; |
5260325f | 466 | case 'l': |
467 | options.user = optarg; | |
468 | break; | |
5260325f | 469 | case 'R': |
48e671d5 | 470 | if (sscanf(optarg, "%hu/%255[^/]/%hu", &fwd_port, buf, |
471 | &fwd_host_port) != 3 && | |
472 | sscanf(optarg, "%hu:%255[^:]:%hu", &fwd_port, buf, | |
473 | &fwd_host_port) != 3) { | |
f5a1a01a | 474 | fprintf(stderr, |
475 | "Bad forwarding specification '%s'.\n", | |
476 | optarg); | |
5260325f | 477 | usage(); |
478 | /* NOTREACHED */ | |
479 | } | |
f5a1a01a | 480 | add_remote_forward(&options, fwd_port, buf, |
481 | fwd_host_port); | |
5260325f | 482 | break; |
5260325f | 483 | case 'L': |
48e671d5 | 484 | if (sscanf(optarg, "%hu/%255[^/]/%hu", &fwd_port, buf, |
485 | &fwd_host_port) != 3 && | |
486 | sscanf(optarg, "%hu:%255[^:]:%hu", &fwd_port, buf, | |
487 | &fwd_host_port) != 3) { | |
f5a1a01a | 488 | fprintf(stderr, |
489 | "Bad forwarding specification '%s'.\n", | |
490 | optarg); | |
5260325f | 491 | usage(); |
492 | /* NOTREACHED */ | |
493 | } | |
f5a1a01a | 494 | add_local_forward(&options, fwd_port, buf, |
495 | fwd_host_port); | |
5260325f | 496 | break; |
0490e609 | 497 | |
498 | case 'D': | |
2d2a2c65 | 499 | fwd_port = a2port(optarg); |
500 | if (fwd_port == 0) { | |
f5a1a01a | 501 | fprintf(stderr, "Bad dynamic port '%s'\n", |
502 | optarg); | |
6031af8d | 503 | exit(1); |
504 | } | |
0490e609 | 505 | add_local_forward(&options, fwd_port, "socks4", 0); |
506 | break; | |
507 | ||
5260325f | 508 | case 'C': |
509 | options.compression = 1; | |
510 | break; | |
8ce64345 | 511 | case 'N': |
512 | no_shell_flag = 1; | |
513 | no_tty_flag = 1; | |
514 | break; | |
8ce64345 | 515 | case 'T': |
516 | no_tty_flag = 1; | |
517 | break; | |
5260325f | 518 | case 'o': |
519 | dummy = 1; | |
f5a1a01a | 520 | if (process_config_line(&options, host ? host : "", |
521 | optarg, "command-line", 0, &dummy) != 0) | |
5260325f | 522 | exit(1); |
523 | break; | |
ae810de7 | 524 | case 's': |
525 | subsystem_flag = 1; | |
526 | break; | |
3435f5a6 | 527 | case 'b': |
528 | options.bind_address = optarg; | |
529 | break; | |
5260325f | 530 | default: |
531 | usage(); | |
532 | } | |
533 | } | |
534 | ||
f5a1a01a | 535 | ac -= optind; |
536 | av += optind; | |
537 | ||
538 | if (ac > 0 && !host && **av != '-') { | |
539 | if (strchr(*av, '@')) { | |
540 | p = xstrdup(*av); | |
541 | cp = strchr(p, '@'); | |
542 | if (cp == NULL || cp == p) | |
543 | usage(); | |
544 | options.user = p; | |
545 | *cp = '\0'; | |
546 | host = ++cp; | |
547 | } else | |
548 | host = *av; | |
549 | ac--, av++; | |
550 | if (ac > 0) { | |
551 | optind = 0; | |
552 | optreset = 1; | |
553 | goto again; | |
554 | } | |
555 | } | |
556 | ||
5260325f | 557 | /* Check that we got a host name. */ |
558 | if (!host) | |
8efc0c15 | 559 | usage(); |
5260325f | 560 | |
22d89d24 | 561 | SSLeay_add_all_algorithms(); |
fa08c86b | 562 | ERR_load_crypto_strings(); |
22d89d24 | 563 | |
5260325f | 564 | /* Initialize the command to execute on remote host. */ |
565 | buffer_init(&command); | |
566 | ||
aa3378df | 567 | /* |
568 | * Save the command to execute on the remote host in a buffer. There | |
569 | * is no limit on the length of the command, except by the maximum | |
570 | * packet size. Also sets the tty flag if there is no command. | |
571 | */ | |
f5a1a01a | 572 | if (!ac) { |
5260325f | 573 | /* No command specified - execute shell on a tty. */ |
574 | tty_flag = 1; | |
ae810de7 | 575 | if (subsystem_flag) { |
f5a1a01a | 576 | fprintf(stderr, |
577 | "You must specify a subsystem to invoke.\n"); | |
ae810de7 | 578 | usage(); |
579 | } | |
5260325f | 580 | } else { |
f5a1a01a | 581 | /* A command has been specified. Store it into the buffer. */ |
582 | for (i = 0; i < ac; i++) { | |
583 | if (i) | |
5260325f | 584 | buffer_append(&command, " ", 1); |
585 | buffer_append(&command, av[i], strlen(av[i])); | |
586 | } | |
8efc0c15 | 587 | } |
5260325f | 588 | |
589 | /* Cannot fork to background if no command. */ | |
14a9a859 | 590 | if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag) |
5260325f | 591 | fatal("Cannot fork into background without a command to execute."); |
592 | ||
593 | /* Allocate a tty by default if no command specified. */ | |
594 | if (buffer_len(&command) == 0) | |
595 | tty_flag = 1; | |
596 | ||
0b6fbf03 | 597 | /* Force no tty*/ |
598 | if (no_tty_flag) | |
599 | tty_flag = 0; | |
5260325f | 600 | /* Do not allocate a tty if stdin is not a tty. */ |
8abcdba4 | 601 | if (!isatty(fileno(stdin)) && !force_tty_flag) { |
5260325f | 602 | if (tty_flag) |
54b974dc | 603 | log("Pseudo-terminal will not be allocated because stdin is not a terminal."); |
5260325f | 604 | tty_flag = 0; |
605 | } | |
8ce64345 | 606 | |
20244695 | 607 | /* |
608 | * Initialize "log" output. Since we are the client all output | |
609 | * actually goes to stderr. | |
610 | */ | |
cc44f691 | 611 | log_init(av[0], options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level, |
612 | SYSLOG_FACILITY_USER, 1); | |
5260325f | 613 | |
614 | /* Read per-user configuration file. */ | |
42f11eb2 | 615 | snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, _PATH_SSH_USER_CONFFILE); |
5260325f | 616 | read_config_file(buf, host, &options); |
617 | ||
618 | /* Read systemwide configuration file. */ | |
42f11eb2 | 619 | read_config_file(_PATH_HOST_CONFIG_FILE, host, &options); |
5260325f | 620 | |
621 | /* Fill configuration defaults. */ | |
622 | fill_default_options(&options); | |
623 | ||
624 | /* reinit */ | |
20244695 | 625 | log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 1); |
5260325f | 626 | |
e339aa53 | 627 | seed_rng(); |
628 | ||
5260325f | 629 | if (options.user == NULL) |
630 | options.user = xstrdup(pw->pw_name); | |
631 | ||
632 | if (options.hostname != NULL) | |
633 | host = options.hostname; | |
634 | ||
5260325f | 635 | /* Disable rhosts authentication if not running as root. */ |
3c62e7eb | 636 | #ifdef HAVE_CYGWIN |
637 | /* Ignore uid if running under Windows */ | |
638 | if (!options.use_privileged_port) { | |
639 | #else | |
5260325f | 640 | if (original_effective_uid != 0 || !options.use_privileged_port) { |
3c62e7eb | 641 | #endif |
6ffc9c88 | 642 | debug("Rhosts Authentication disabled, " |
643 | "originating port will not be trusted."); | |
5260325f | 644 | options.rhosts_authentication = 0; |
5260325f | 645 | } |
aa3378df | 646 | /* |
647 | * If using rsh has been selected, exec it now (without trying | |
648 | * anything else). Note that we must release privileges first. | |
649 | */ | |
5260325f | 650 | if (options.use_rsh) { |
aa3378df | 651 | /* |
652 | * Restore our superuser privileges. This must be done | |
653 | * before permanently setting the uid. | |
654 | */ | |
5260325f | 655 | restore_uid(); |
656 | ||
657 | /* Switch to the original uid permanently. */ | |
63bd8c36 | 658 | permanently_set_uid(pw); |
5260325f | 659 | |
660 | /* Execute rsh. */ | |
661 | rsh_connect(host, options.user, &command); | |
662 | fatal("rsh_connect returned"); | |
8efc0c15 | 663 | } |
5260325f | 664 | /* Restore our superuser privileges. */ |
665 | restore_uid(); | |
666 | ||
6ffc9c88 | 667 | /* Open a connection to the remote host. */ |
5260325f | 668 | |
ce773142 | 669 | cerr = ssh_connect(host, &hostaddr, options.port, |
6ffc9c88 | 670 | options.connection_attempts, |
671 | original_effective_uid != 0 || !options.use_privileged_port, | |
63bd8c36 | 672 | pw, options.proxy_command); |
5260325f | 673 | |
aa3378df | 674 | /* |
675 | * If we successfully made the connection, load the host private key | |
676 | * in case we will need it later for combined rsa-rhosts | |
677 | * authentication. This must be done before releasing extra | |
678 | * privileges, because the file is only readable by root. | |
679 | */ | |
8002af61 | 680 | sensitive_data.nkeys = 0; |
681 | sensitive_data.keys = NULL; | |
ce773142 | 682 | if (!cerr && (options.rhosts_rsa_authentication || |
8002af61 | 683 | options.hostbased_authentication)) { |
684 | sensitive_data.nkeys = 3; | |
685 | sensitive_data.keys = xmalloc(sensitive_data.nkeys*sizeof(Key)); | |
686 | sensitive_data.keys[0] = key_load_private_type(KEY_RSA1, | |
aeaa3d9e | 687 | _PATH_HOST_KEY_FILE, "", NULL); |
8002af61 | 688 | sensitive_data.keys[1] = key_load_private_type(KEY_DSA, |
689 | _PATH_HOST_DSA_KEY_FILE, "", NULL); | |
690 | sensitive_data.keys[2] = key_load_private_type(KEY_RSA, | |
691 | _PATH_HOST_RSA_KEY_FILE, "", NULL); | |
5260325f | 692 | } |
aa3378df | 693 | /* |
694 | * Get rid of any extra privileges that we may have. We will no | |
695 | * longer need them. Also, extra privileges could make it very hard | |
696 | * to read identity files and other non-world-readable files from the | |
697 | * user's home directory if it happens to be on a NFS volume where | |
698 | * root is mapped to nobody. | |
699 | */ | |
700 | ||
701 | /* | |
702 | * Note that some legacy systems need to postpone the following call | |
703 | * to permanently_set_uid() until the private hostkey is destroyed | |
704 | * with RSA_free(). Otherwise the calling user could ptrace() the | |
705 | * process, read the private hostkey and impersonate the host. | |
706 | * OpenBSD does not allow ptracing of setuid processes. | |
707 | */ | |
63bd8c36 | 708 | permanently_set_uid(pw); |
5260325f | 709 | |
aa3378df | 710 | /* |
711 | * Now that we are back to our own permissions, create ~/.ssh | |
712 | * directory if it doesn\'t already exist. | |
713 | */ | |
42f11eb2 | 714 | snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, _PATH_SSH_USER_DIR); |
5260325f | 715 | if (stat(buf, &st) < 0) |
704b1659 | 716 | if (mkdir(buf, 0700) < 0) |
5260325f | 717 | error("Could not create directory '%.200s'.", buf); |
718 | ||
719 | /* Check if the connection failed, and try "rsh" if appropriate. */ | |
ce773142 | 720 | if (cerr) { |
721 | if (!options.fallback_to_rsh) | |
722 | exit(1); | |
5260325f | 723 | if (options.port != 0) |
ce773142 | 724 | log("Secure connection to %.100s on port %hu refused; " |
725 | "reverting to insecure method", | |
726 | host, options.port); | |
5260325f | 727 | else |
ce773142 | 728 | log("Secure connection to %.100s refused; " |
729 | "reverting to insecure method.", host); | |
5260325f | 730 | |
ce773142 | 731 | rsh_connect(host, options.user, &command); |
732 | fatal("rsh_connect returned"); | |
8efc0c15 | 733 | } |
fee56204 | 734 | /* load options.identity_files */ |
735 | load_public_identity_files(); | |
736 | ||
737 | /* Expand ~ in known host file names. */ | |
738 | /* XXX mem-leaks: */ | |
fa08c86b | 739 | options.system_hostfile = |
740 | tilde_expand_filename(options.system_hostfile, original_real_uid); | |
741 | options.user_hostfile = | |
742 | tilde_expand_filename(options.user_hostfile, original_real_uid); | |
743 | options.system_hostfile2 = | |
744 | tilde_expand_filename(options.system_hostfile2, original_real_uid); | |
745 | options.user_hostfile2 = | |
746 | tilde_expand_filename(options.user_hostfile2, original_real_uid); | |
5260325f | 747 | |
748 | /* Log into the remote system. This never returns if the login fails. */ | |
8002af61 | 749 | ssh_login(sensitive_data.keys, sensitive_data.nkeys, |
750 | host, (struct sockaddr *)&hostaddr, pw); | |
751 | ||
752 | /* We no longer need the private host keys. Clear them now. */ | |
753 | if (sensitive_data.nkeys != 0) { | |
754 | for (i = 0; i < sensitive_data.nkeys; i++) { | |
755 | if (sensitive_data.keys[i] != NULL) { | |
756 | /* Destroys contents safely */ | |
757 | debug3("clear hostkey %d", i); | |
758 | key_free(sensitive_data.keys[i]); | |
759 | sensitive_data.keys[i] = NULL; | |
760 | } | |
761 | } | |
762 | xfree(sensitive_data.keys); | |
763 | } | |
5260325f | 764 | |
8ce64345 | 765 | exit_status = compat20 ? ssh_session2() : ssh_session(); |
766 | packet_close(); | |
767 | return exit_status; | |
768 | } | |
769 | ||
396c147e | 770 | static void |
0b242b12 | 771 | x11_get_proto(char *proto, int proto_len, char *data, int data_len) |
772 | { | |
773 | char line[512]; | |
774 | FILE *f; | |
775 | int got_data = 0, i; | |
776 | ||
fa649821 | 777 | if (options.xauth_location) { |
778 | /* Try to get Xauthority information for the display. */ | |
5ca51e19 | 779 | snprintf(line, sizeof line, "%.100s list %.200s 2>" _PATH_DEVNULL, |
fa649821 | 780 | options.xauth_location, getenv("DISPLAY")); |
781 | f = popen(line, "r"); | |
782 | if (f && fgets(line, sizeof(line), f) && | |
783 | sscanf(line, "%*s %s %s", proto, data) == 2) | |
784 | got_data = 1; | |
785 | if (f) | |
786 | pclose(f); | |
787 | } | |
0b242b12 | 788 | /* |
789 | * If we didn't get authentication data, just make up some | |
790 | * data. The forwarding code will check the validity of the | |
791 | * response anyway, and substitute this data. The X11 | |
792 | * server, however, will ignore this fake data and use | |
793 | * whatever authentication mechanisms it was using otherwise | |
794 | * for the local connection. | |
795 | */ | |
796 | if (!got_data) { | |
797 | u_int32_t rand = 0; | |
798 | ||
799 | strlcpy(proto, "MIT-MAGIC-COOKIE-1", proto_len); | |
800 | for (i = 0; i < 16; i++) { | |
801 | if (i % 4 == 0) | |
802 | rand = arc4random(); | |
803 | snprintf(data + 2 * i, data_len - 2 * i, "%02x", rand & 0xff); | |
804 | rand >>= 8; | |
805 | } | |
806 | } | |
807 | } | |
808 | ||
396c147e | 809 | static void |
fa08c86b | 810 | ssh_init_forwarding(void) |
811 | { | |
02a024dd | 812 | int success = 0; |
fa08c86b | 813 | int i; |
02a024dd | 814 | |
fa08c86b | 815 | /* Initiate local TCP/IP port forwardings. */ |
816 | for (i = 0; i < options.num_local_forwards; i++) { | |
817 | debug("Connections to local port %d forwarded to remote address %.200s:%d", | |
818 | options.local_forwards[i].port, | |
819 | options.local_forwards[i].host, | |
820 | options.local_forwards[i].host_port); | |
02a024dd | 821 | success += channel_request_local_forwarding( |
fa08c86b | 822 | options.local_forwards[i].port, |
823 | options.local_forwards[i].host, | |
824 | options.local_forwards[i].host_port, | |
825 | options.gateway_ports); | |
826 | } | |
02a024dd | 827 | if (i > 0 && success == 0) |
828 | error("Could not request local forwarding."); | |
fa08c86b | 829 | |
830 | /* Initiate remote TCP/IP port forwardings. */ | |
831 | for (i = 0; i < options.num_remote_forwards; i++) { | |
832 | debug("Connections to remote port %d forwarded to local address %.200s:%d", | |
833 | options.remote_forwards[i].port, | |
834 | options.remote_forwards[i].host, | |
835 | options.remote_forwards[i].host_port); | |
836 | channel_request_remote_forwarding( | |
837 | options.remote_forwards[i].port, | |
838 | options.remote_forwards[i].host, | |
839 | options.remote_forwards[i].host_port); | |
840 | } | |
841 | } | |
842 | ||
396c147e | 843 | static void |
fa08c86b | 844 | check_agent_present(void) |
845 | { | |
846 | if (options.forward_agent) { | |
847 | /* Clear agent forwarding if we don\'t have an agent. */ | |
848 | int authfd = ssh_get_authentication_socket(); | |
849 | if (authfd < 0) | |
850 | options.forward_agent = 0; | |
851 | else | |
852 | ssh_close_authentication_socket(authfd); | |
853 | } | |
854 | } | |
855 | ||
396c147e | 856 | static int |
8ce64345 | 857 | ssh_session(void) |
858 | { | |
859 | int type; | |
8ce64345 | 860 | int plen; |
861 | int interactive = 0; | |
862 | int have_tty = 0; | |
863 | struct winsize ws; | |
8ce64345 | 864 | char *cp; |
865 | ||
5260325f | 866 | /* Enable compression if requested. */ |
867 | if (options.compression) { | |
868 | debug("Requesting compression at level %d.", options.compression_level); | |
869 | ||
870 | if (options.compression_level < 1 || options.compression_level > 9) | |
871 | fatal("Compression level must be from 1 (fast) to 9 (slow, best)."); | |
872 | ||
873 | /* Send the request. */ | |
874 | packet_start(SSH_CMSG_REQUEST_COMPRESSION); | |
875 | packet_put_int(options.compression_level); | |
876 | packet_send(); | |
877 | packet_write_wait(); | |
878 | type = packet_read(&plen); | |
879 | if (type == SSH_SMSG_SUCCESS) | |
880 | packet_start_compression(options.compression_level); | |
881 | else if (type == SSH_SMSG_FAILURE) | |
882 | log("Warning: Remote host refused compression."); | |
883 | else | |
884 | packet_disconnect("Protocol error waiting for compression response."); | |
885 | } | |
886 | /* Allocate a pseudo tty if appropriate. */ | |
887 | if (tty_flag) { | |
888 | debug("Requesting pty."); | |
889 | ||
890 | /* Start the packet. */ | |
891 | packet_start(SSH_CMSG_REQUEST_PTY); | |
892 | ||
893 | /* Store TERM in the packet. There is no limit on the | |
894 | length of the string. */ | |
895 | cp = getenv("TERM"); | |
896 | if (!cp) | |
897 | cp = ""; | |
449c5ba5 | 898 | packet_put_cstring(cp); |
5260325f | 899 | |
900 | /* Store window size in the packet. */ | |
901 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) | |
902 | memset(&ws, 0, sizeof(ws)); | |
903 | packet_put_int(ws.ws_row); | |
904 | packet_put_int(ws.ws_col); | |
905 | packet_put_int(ws.ws_xpixel); | |
906 | packet_put_int(ws.ws_ypixel); | |
907 | ||
908 | /* Store tty modes in the packet. */ | |
30dcc918 | 909 | tty_make_modes(fileno(stdin), NULL); |
5260325f | 910 | |
911 | /* Send the packet, and wait for it to leave. */ | |
912 | packet_send(); | |
913 | packet_write_wait(); | |
914 | ||
915 | /* Read response from the server. */ | |
916 | type = packet_read(&plen); | |
4fe2af09 | 917 | if (type == SSH_SMSG_SUCCESS) { |
5260325f | 918 | interactive = 1; |
8ce64345 | 919 | have_tty = 1; |
4fe2af09 | 920 | } else if (type == SSH_SMSG_FAILURE) |
5260325f | 921 | log("Warning: Remote host failed or refused to allocate a pseudo tty."); |
922 | else | |
923 | packet_disconnect("Protocol error waiting for pty request response."); | |
924 | } | |
925 | /* Request X11 forwarding if enabled and DISPLAY is set. */ | |
926 | if (options.forward_x11 && getenv("DISPLAY") != NULL) { | |
0b242b12 | 927 | char proto[512], data[512]; |
928 | /* Get reasonable local authentication information. */ | |
929 | x11_get_proto(proto, sizeof proto, data, sizeof data); | |
930 | /* Request forwarding with authentication spoofing. */ | |
5260325f | 931 | debug("Requesting X11 forwarding with authentication spoofing."); |
0b242b12 | 932 | x11_request_forwarding_with_spoofing(0, proto, data); |
5260325f | 933 | |
934 | /* Read response from the server. */ | |
935 | type = packet_read(&plen); | |
936 | if (type == SSH_SMSG_SUCCESS) { | |
5260325f | 937 | interactive = 1; |
0b242b12 | 938 | } else if (type == SSH_SMSG_FAILURE) { |
5260325f | 939 | log("Warning: Remote host denied X11 forwarding."); |
0b242b12 | 940 | } else { |
5260325f | 941 | packet_disconnect("Protocol error waiting for X11 forwarding"); |
0b242b12 | 942 | } |
5260325f | 943 | } |
944 | /* Tell the packet module whether this is an interactive session. */ | |
b5c334cc | 945 | packet_set_interactive(interactive); |
5260325f | 946 | |
947 | /* Request authentication agent forwarding if appropriate. */ | |
fa08c86b | 948 | check_agent_present(); |
949 | ||
5260325f | 950 | if (options.forward_agent) { |
951 | debug("Requesting authentication agent forwarding."); | |
952 | auth_request_forwarding(); | |
953 | ||
954 | /* Read response from the server. */ | |
955 | type = packet_read(&plen); | |
956 | packet_integrity_check(plen, 0, type); | |
957 | if (type != SSH_SMSG_SUCCESS) | |
958 | log("Warning: Remote host denied authentication agent forwarding."); | |
959 | } | |
8efc0c15 | 960 | |
fa08c86b | 961 | /* Initiate port forwardings. */ |
962 | ssh_init_forwarding(); | |
5260325f | 963 | |
aa3378df | 964 | /* If requested, let ssh continue in the background. */ |
6ae2364d | 965 | if (fork_after_authentication_flag) |
aa3378df | 966 | if (daemon(1, 1) < 0) |
967 | fatal("daemon() failed: %.200s", strerror(errno)); | |
968 | ||
969 | /* | |
970 | * If a command was specified on the command line, execute the | |
971 | * command now. Otherwise request the server to start a shell. | |
972 | */ | |
5260325f | 973 | if (buffer_len(&command) > 0) { |
974 | int len = buffer_len(&command); | |
975 | if (len > 900) | |
976 | len = 900; | |
977 | debug("Sending command: %.*s", len, buffer_ptr(&command)); | |
978 | packet_start(SSH_CMSG_EXEC_CMD); | |
979 | packet_put_string(buffer_ptr(&command), buffer_len(&command)); | |
980 | packet_send(); | |
981 | packet_write_wait(); | |
982 | } else { | |
983 | debug("Requesting shell."); | |
984 | packet_start(SSH_CMSG_EXEC_SHELL); | |
985 | packet_send(); | |
986 | packet_write_wait(); | |
987 | } | |
988 | ||
989 | /* Enter the interactive session. */ | |
4bf9c10e | 990 | return client_loop(have_tty, tty_flag ? |
991 | options.escape_char : SSH_ESCAPECHAR_NONE, 0); | |
8ce64345 | 992 | } |
5260325f | 993 | |
396c147e | 994 | static void |
1f3bf5aa | 995 | client_subsystem_reply(int type, int plen, void *ctxt) |
996 | { | |
997 | int id, len; | |
998 | ||
999 | id = packet_get_int(); | |
1000 | len = buffer_len(&command); | |
ce91d6f8 | 1001 | if (len > 900) |
1002 | len = 900; | |
1f3bf5aa | 1003 | packet_done(); |
1004 | if (type == SSH2_MSG_CHANNEL_FAILURE) | |
1005 | fatal("Request for subsystem '%.*s' failed on channel %d", | |
1006 | len, buffer_ptr(&command), id); | |
1007 | } | |
1008 | ||
396c147e | 1009 | static void |
fa08c86b | 1010 | ssh_session2_callback(int id, void *arg) |
8ce64345 | 1011 | { |
1012 | int len; | |
b5c334cc | 1013 | int interactive = 0; |
30dcc918 | 1014 | struct termios tio; |
b5c334cc | 1015 | |
6a416424 | 1016 | debug("client_init id %d arg %ld", id, (long)arg); |
8ce64345 | 1017 | |
8ce64345 | 1018 | if (tty_flag) { |
1019 | struct winsize ws; | |
1020 | char *cp; | |
1021 | cp = getenv("TERM"); | |
1022 | if (!cp) | |
1023 | cp = ""; | |
1024 | /* Store window size in the packet. */ | |
1025 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) | |
1026 | memset(&ws, 0, sizeof(ws)); | |
1027 | ||
1028 | channel_request_start(id, "pty-req", 0); | |
1029 | packet_put_cstring(cp); | |
1030 | packet_put_int(ws.ws_col); | |
1031 | packet_put_int(ws.ws_row); | |
1032 | packet_put_int(ws.ws_xpixel); | |
1033 | packet_put_int(ws.ws_ypixel); | |
30dcc918 | 1034 | tio = get_saved_tio(); |
1035 | tty_make_modes(/*ignored*/ 0, &tio); | |
8ce64345 | 1036 | packet_send(); |
b5c334cc | 1037 | interactive = 1; |
8ce64345 | 1038 | /* XXX wait for reply */ |
1039 | } | |
0b242b12 | 1040 | if (options.forward_x11 && |
1041 | getenv("DISPLAY") != NULL) { | |
1042 | char proto[512], data[512]; | |
1043 | /* Get reasonable local authentication information. */ | |
1044 | x11_get_proto(proto, sizeof proto, data, sizeof data); | |
1045 | /* Request forwarding with authentication spoofing. */ | |
1046 | debug("Requesting X11 forwarding with authentication spoofing."); | |
1047 | x11_request_forwarding_with_spoofing(id, proto, data); | |
b5c334cc | 1048 | interactive = 1; |
0b242b12 | 1049 | /* XXX wait for reply */ |
1050 | } | |
1051 | ||
fa08c86b | 1052 | check_agent_present(); |
1053 | if (options.forward_agent) { | |
1054 | debug("Requesting authentication agent forwarding."); | |
1055 | channel_request_start(id, "auth-agent-req@openssh.com", 0); | |
1056 | packet_send(); | |
1057 | } | |
1058 | ||
8ce64345 | 1059 | len = buffer_len(&command); |
1060 | if (len > 0) { | |
1061 | if (len > 900) | |
1062 | len = 900; | |
ae810de7 | 1063 | if (subsystem_flag) { |
1064 | debug("Sending subsystem: %.*s", len, buffer_ptr(&command)); | |
1f3bf5aa | 1065 | channel_request_start(id, "subsystem", /*want reply*/ 1); |
1066 | /* register callback for reply */ | |
1067 | /* XXX we asume that client_loop has already been called */ | |
1068 | dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &client_subsystem_reply); | |
1069 | dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &client_subsystem_reply); | |
ae810de7 | 1070 | } else { |
1071 | debug("Sending command: %.*s", len, buffer_ptr(&command)); | |
1072 | channel_request_start(id, "exec", 0); | |
1073 | } | |
ce91d6f8 | 1074 | packet_put_string(buffer_ptr(&command), buffer_len(&command)); |
8ce64345 | 1075 | packet_send(); |
1076 | } else { | |
1077 | channel_request(id, "shell", 0); | |
1078 | } | |
1079 | /* channel_callback(id, SSH2_MSG_OPEN_CONFIGMATION, client_init, 0); */ | |
1f3bf5aa | 1080 | |
8ce64345 | 1081 | /* register different callback, etc. XXX */ |
b5c334cc | 1082 | packet_set_interactive(interactive); |
8ce64345 | 1083 | } |
1084 | ||
396c147e | 1085 | static int |
eb0dd41f | 1086 | ssh_session2_command(void) |
8ce64345 | 1087 | { |
719fc62f | 1088 | Channel *c; |
1089 | int window, packetmax, in, out, err; | |
2e73a022 | 1090 | |
14a9a859 | 1091 | if (stdin_null_flag) { |
5ca51e19 | 1092 | in = open(_PATH_DEVNULL, O_RDONLY); |
14a9a859 | 1093 | } else { |
1094 | in = dup(STDIN_FILENO); | |
1095 | } | |
2e73a022 | 1096 | out = dup(STDOUT_FILENO); |
1097 | err = dup(STDERR_FILENO); | |
8ce64345 | 1098 | |
1099 | if (in < 0 || out < 0 || err < 0) | |
14a9a859 | 1100 | fatal("dup() in/out/err failed"); |
8ce64345 | 1101 | |
a22aff1f | 1102 | /* enable nonblocking unless tty */ |
1103 | if (!isatty(in)) | |
1104 | set_nonblock(in); | |
1105 | if (!isatty(out)) | |
1106 | set_nonblock(out); | |
1107 | if (!isatty(err)) | |
1108 | set_nonblock(err); | |
1109 | ||
bcbf86ec | 1110 | window = CHAN_SES_WINDOW_DEFAULT; |
1111 | packetmax = CHAN_SES_PACKET_DEFAULT; | |
1112 | if (!tty_flag) { | |
8ce64345 | 1113 | window *= 2; |
bcbf86ec | 1114 | packetmax *=2; |
8ce64345 | 1115 | } |
719fc62f | 1116 | c = channel_new( |
8ce64345 | 1117 | "session", SSH_CHANNEL_OPENING, in, out, err, |
bcbf86ec | 1118 | window, packetmax, CHAN_EXTENDED_WRITE, |
a22aff1f | 1119 | xstrdup("client-session"), /*nonblock*/0); |
719fc62f | 1120 | if (c == NULL) |
1121 | fatal("ssh_session2_command: channel_new failed"); | |
8ce64345 | 1122 | |
719fc62f | 1123 | debug3("ssh_session2_command: channel_new: %d", c->self); |
eb0dd41f | 1124 | |
36e1f6a1 | 1125 | channel_send_open(c->self); |
719fc62f | 1126 | channel_register_callback(c->self, SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, |
fa08c86b | 1127 | ssh_session2_callback, (void *)0); |
5260325f | 1128 | |
719fc62f | 1129 | return c->self; |
eb0dd41f | 1130 | } |
1131 | ||
396c147e | 1132 | static int |
eb0dd41f | 1133 | ssh_session2(void) |
1134 | { | |
1135 | int id; | |
1136 | ||
1137 | /* XXX should be pre-session */ | |
1138 | ssh_init_forwarding(); | |
1139 | ||
1140 | id = no_shell_flag ? -1 : ssh_session2_command(); | |
1141 | ||
1142 | /* If requested, let ssh continue in the background. */ | |
1143 | if (fork_after_authentication_flag) | |
1144 | if (daemon(1, 1) < 0) | |
1145 | fatal("daemon() failed: %.200s", strerror(errno)); | |
1146 | ||
4bf9c10e | 1147 | return client_loop(tty_flag, tty_flag ? |
1148 | options.escape_char : SSH_ESCAPECHAR_NONE, id); | |
8efc0c15 | 1149 | } |
fa08c86b | 1150 | |
396c147e | 1151 | static void |
fee56204 | 1152 | load_public_identity_files(void) |
1153 | { | |
1154 | char *filename; | |
1155 | Key *public; | |
1156 | int i; | |
1157 | ||
1158 | for (i = 0; i < options.num_identity_files; i++) { | |
1159 | filename = tilde_expand_filename(options.identity_files[i], | |
1160 | original_real_uid); | |
aeaa3d9e | 1161 | public = key_load_public(filename, NULL); |
fee56204 | 1162 | debug("identity file %s type %d", filename, |
1163 | public ? public->type : -1); | |
1164 | xfree(options.identity_files[i]); | |
1165 | options.identity_files[i] = filename; | |
1166 | options.identity_keys[i] = public; | |
1167 | } | |
383546c4 | 1168 | #ifdef SMARTCARD |
1169 | if (sc_reader_num != -1 && | |
1170 | options.num_identity_files + 1 < SSH_MAX_IDENTITY_FILES && | |
1171 | (public = sc_get_key(sc_reader_num)) != NULL ) { | |
1172 | Key *new; | |
1173 | ||
1174 | /* XXX ssh1 vs ssh2 */ | |
1175 | new = key_new(KEY_RSA); | |
1176 | new->flags = KEY_FLAG_EXT; | |
1177 | BN_copy(new->rsa->n, public->rsa->n); | |
1178 | BN_copy(new->rsa->e, public->rsa->e); | |
1179 | RSA_set_method(new->rsa, sc_get_engine()); | |
1180 | i = options.num_identity_files++; | |
1181 | options.identity_keys[i] = new; | |
1182 | options.identity_files[i] = xstrdup("smartcard rsa key");; | |
1183 | ||
1184 | new = key_new(KEY_RSA1); | |
1185 | new->flags = KEY_FLAG_EXT; | |
1186 | BN_copy(new->rsa->n, public->rsa->n); | |
1187 | BN_copy(new->rsa->e, public->rsa->e); | |
1188 | RSA_set_method(new->rsa, sc_get_engine()); | |
1189 | i = options.num_identity_files++; | |
1190 | options.identity_keys[i] = new; | |
1191 | options.identity_files[i] = xstrdup("smartcard rsa1 key");; | |
1192 | ||
1193 | key_free(public); | |
1194 | } | |
1195 | #endif | |
fee56204 | 1196 | } |