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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" | |
6683b40f | 42 | RCSID("$OpenBSD: ssh.c,v 1.110 2001/04/11 13:56:13 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" |
7368a6c8 | 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" | |
8efc0c15 | 70 | |
f601d847 | 71 | #ifdef HAVE___PROGNAME |
72 | extern char *__progname; | |
260d427b | 73 | #else |
74 | char *__progname; | |
75 | #endif | |
f601d847 | 76 | |
48e671d5 | 77 | /* Flag indicating whether IPv4 or IPv6. This can be set on the command line. |
78 | Default value is AF_UNSPEC means both IPv4 and IPv6. */ | |
59e76f33 | 79 | #ifdef IPV4_DEFAULT |
80 | int IPv4or6 = AF_INET; | |
81 | #else | |
48e671d5 | 82 | int IPv4or6 = AF_UNSPEC; |
59e76f33 | 83 | #endif |
48e671d5 | 84 | |
5260325f | 85 | /* Flag indicating whether debug mode is on. This can be set on the command line. */ |
8efc0c15 | 86 | int debug_flag = 0; |
87 | ||
a8be9f80 | 88 | /* Flag indicating whether a tty should be allocated */ |
8efc0c15 | 89 | int tty_flag = 0; |
8abcdba4 | 90 | int no_tty_flag = 0; |
91 | int force_tty_flag = 0; | |
8efc0c15 | 92 | |
8ce64345 | 93 | /* don't exec a shell */ |
94 | int no_shell_flag = 0; | |
8ce64345 | 95 | |
aa3378df | 96 | /* |
97 | * Flag indicating that nothing should be read from stdin. This can be set | |
98 | * on the command line. | |
99 | */ | |
8efc0c15 | 100 | int stdin_null_flag = 0; |
101 | ||
aa3378df | 102 | /* |
103 | * Flag indicating that ssh should fork after authentication. This is useful | |
104 | * so that the pasphrase can be entered manually, and then ssh goes to the | |
105 | * background. | |
106 | */ | |
8efc0c15 | 107 | int fork_after_authentication_flag = 0; |
108 | ||
aa3378df | 109 | /* |
110 | * General data structure for command line options and options configurable | |
111 | * in configuration files. See readconf.h. | |
112 | */ | |
8efc0c15 | 113 | Options options; |
114 | ||
aa3378df | 115 | /* |
116 | * Name of the host we are connecting to. This is the name given on the | |
117 | * command line, or the HostName specified for the user-supplied name in a | |
118 | * configuration file. | |
119 | */ | |
8efc0c15 | 120 | char *host; |
121 | ||
122 | /* socket address the host resolves to */ | |
48e671d5 | 123 | struct sockaddr_storage hostaddr; |
8efc0c15 | 124 | |
aa3378df | 125 | /* |
126 | * Flag to indicate that we have received a window change signal which has | |
127 | * not yet been processed. This will cause a message indicating the new | |
128 | * window size to be sent to the server a little later. This is volatile | |
129 | * because this is updated in a signal handler. | |
130 | */ | |
8efc0c15 | 131 | volatile int received_window_change_signal = 0; |
132 | ||
8efc0c15 | 133 | /* Host private key. */ |
aeaa3d9e | 134 | Key *host_private_key = NULL; |
8efc0c15 | 135 | |
136 | /* Original real UID. */ | |
137 | uid_t original_real_uid; | |
138 | ||
8ce64345 | 139 | /* command to be executed */ |
140 | Buffer command; | |
141 | ||
ae810de7 | 142 | /* Should we execute a command or invoke a subsystem? */ |
143 | int subsystem_flag = 0; | |
144 | ||
8efc0c15 | 145 | /* Prints a help message to the user. This function never returns. */ |
146 | ||
147 | void | |
5ca51e19 | 148 | usage(void) |
8efc0c15 | 149 | { |
1fe6a48f | 150 | fprintf(stderr, "Usage: %s [options] host [command]\n", __progname); |
5260325f | 151 | fprintf(stderr, "Options:\n"); |
152 | fprintf(stderr, " -l user Log in using this user name.\n"); | |
5ca51e19 | 153 | fprintf(stderr, " -n Redirect input from " _PATH_DEVNULL ".\n"); |
71276795 | 154 | fprintf(stderr, " -A Enable authentication agent forwarding.\n"); |
5260325f | 155 | fprintf(stderr, " -a Disable authentication agent forwarding.\n"); |
8efc0c15 | 156 | #ifdef AFS |
5260325f | 157 | fprintf(stderr, " -k Disable Kerberos ticket and AFS token forwarding.\n"); |
158 | #endif /* AFS */ | |
2b87da3b | 159 | fprintf(stderr, " -X Enable X11 connection forwarding.\n"); |
5260325f | 160 | fprintf(stderr, " -x Disable X11 connection forwarding.\n"); |
a01a5f30 | 161 | fprintf(stderr, " -i file Identity for public key authentication " |
162 | "(default: ~/.ssh/identity)\n"); | |
5260325f | 163 | fprintf(stderr, " -t Tty; allocate a tty even if command is given.\n"); |
8ce64345 | 164 | fprintf(stderr, " -T Do not allocate a tty.\n"); |
5260325f | 165 | fprintf(stderr, " -v Verbose; display verbose debugging messages.\n"); |
bcbf86ec | 166 | fprintf(stderr, " Multiple -v increases verbosity.\n"); |
5260325f | 167 | fprintf(stderr, " -V Display version number only.\n"); |
168 | fprintf(stderr, " -P Don't allocate a privileged port.\n"); | |
169 | fprintf(stderr, " -q Quiet; don't display any warning messages.\n"); | |
170 | fprintf(stderr, " -f Fork into background after authentication.\n"); | |
171 | fprintf(stderr, " -e char Set escape character; ``none'' = disable (default: ~).\n"); | |
172 | ||
173 | fprintf(stderr, " -c cipher Select encryption algorithm: " | |
a01a5f30 | 174 | "``3des'', ``blowfish''\n"); |
38967add | 175 | fprintf(stderr, " -m macs Specify MAC algorithms for protocol version 2.\n"); |
5260325f | 176 | fprintf(stderr, " -p port Connect to this port. Server must be on the same port.\n"); |
177 | fprintf(stderr, " -L listen-port:host:port Forward local port to remote address\n"); | |
178 | fprintf(stderr, " -R listen-port:host:port Forward remote port to local address\n"); | |
1fe6a48f | 179 | fprintf(stderr, " These cause %s to listen for connections on a port, and\n", __progname); |
5260325f | 180 | fprintf(stderr, " forward them to the other side by connecting to host:port.\n"); |
0490e609 | 181 | fprintf(stderr, " -D port Dynamically forward local port to multiple remote addresses.\n"); |
6683b40f | 182 | fprintf(stderr, " Allows %s to act as an application-layer proxy.\n", |
183 | __progname); | |
184 | fprintf(stderr, " Protocols supported: SOCKS4, SOCKS5, HTTPS\n"); | |
5260325f | 185 | fprintf(stderr, " -C Enable compression.\n"); |
8ce64345 | 186 | fprintf(stderr, " -N Do not execute a shell or command.\n"); |
5260325f | 187 | fprintf(stderr, " -g Allow remote hosts to connect to forwarded ports.\n"); |
1f3bf5aa | 188 | fprintf(stderr, " -1 Force protocol version 1.\n"); |
189 | fprintf(stderr, " -2 Force protocol version 2.\n"); | |
48e671d5 | 190 | fprintf(stderr, " -4 Use IPv4 only.\n"); |
191 | fprintf(stderr, " -6 Use IPv6 only.\n"); | |
5260325f | 192 | fprintf(stderr, " -o 'option' Process the option as if it was read from a configuration file.\n"); |
ae810de7 | 193 | fprintf(stderr, " -s Invoke command (mandatory) as SSH2 subsystem.\n"); |
5260325f | 194 | exit(1); |
8efc0c15 | 195 | } |
196 | ||
5260325f | 197 | /* |
198 | * Connects to the given host using rsh (or prints an error message and exits | |
199 | * if rsh is not available). This function never returns. | |
200 | */ | |
8efc0c15 | 201 | void |
5260325f | 202 | rsh_connect(char *host, char *user, Buffer * command) |
8efc0c15 | 203 | { |
5260325f | 204 | char *args[10]; |
205 | int i; | |
206 | ||
207 | log("Using rsh. WARNING: Connection will not be encrypted."); | |
208 | /* Build argument list for rsh. */ | |
209 | i = 0; | |
210 | args[i++] = _PATH_RSH; | |
211 | /* host may have to come after user on some systems */ | |
212 | args[i++] = host; | |
213 | if (user) { | |
214 | args[i++] = "-l"; | |
215 | args[i++] = user; | |
216 | } | |
217 | if (buffer_len(command) > 0) { | |
218 | buffer_append(command, "\0", 1); | |
219 | args[i++] = buffer_ptr(command); | |
220 | } | |
221 | args[i++] = NULL; | |
222 | if (debug_flag) { | |
223 | for (i = 0; args[i]; i++) { | |
224 | if (i != 0) | |
225 | fprintf(stderr, " "); | |
226 | fprintf(stderr, "%s", args[i]); | |
227 | } | |
228 | fprintf(stderr, "\n"); | |
8efc0c15 | 229 | } |
5260325f | 230 | execv(_PATH_RSH, args); |
231 | perror(_PATH_RSH); | |
232 | exit(1); | |
8efc0c15 | 233 | } |
234 | ||
fa08c86b | 235 | int ssh_session(void); |
236 | int ssh_session2(void); | |
fee56204 | 237 | void load_public_identity_files(void); |
8ce64345 | 238 | |
5260325f | 239 | /* |
240 | * Main program for the ssh client. | |
241 | */ | |
8efc0c15 | 242 | int |
243 | main(int ac, char **av) | |
244 | { | |
8ce64345 | 245 | int i, opt, optind, exit_status, ok; |
57112b5a | 246 | u_short fwd_port, fwd_host_port; |
6031af8d | 247 | char *optarg, *cp, *endofnumber, buf[256]; |
5260325f | 248 | struct stat st; |
3b1a83df | 249 | struct passwd *pw; |
8ce64345 | 250 | int dummy; |
5260325f | 251 | uid_t original_effective_uid; |
5260325f | 252 | |
260d427b | 253 | __progname = get_progname(av[0]); |
264dce47 | 254 | init_rng(); |
255 | ||
aa3378df | 256 | /* |
257 | * Save the original real uid. It will be needed later (uid-swapping | |
258 | * may clobber the real uid). | |
259 | */ | |
5260325f | 260 | original_real_uid = getuid(); |
261 | original_effective_uid = geteuid(); | |
262 | ||
7322ef0e | 263 | #ifdef HAVE_SETRLIMIT |
5260325f | 264 | /* If we are installed setuid root be careful to not drop core. */ |
265 | if (original_real_uid != original_effective_uid) { | |
266 | struct rlimit rlim; | |
267 | rlim.rlim_cur = rlim.rlim_max = 0; | |
268 | if (setrlimit(RLIMIT_CORE, &rlim) < 0) | |
269 | fatal("setrlimit failed: %.100s", strerror(errno)); | |
8efc0c15 | 270 | } |
3c62e7eb | 271 | #endif |
63bd8c36 | 272 | /* Get user data. */ |
273 | pw = getpwuid(original_real_uid); | |
274 | if (!pw) { | |
275 | log("You don't exist, go away!"); | |
276 | exit(1); | |
277 | } | |
278 | /* Take a copy of the returned structure. */ | |
279 | pw = pwcopy(pw); | |
280 | ||
aa3378df | 281 | /* |
282 | * Use uid-swapping to give up root privileges for the duration of | |
283 | * option processing. We will re-instantiate the rights when we are | |
284 | * ready to create the privileged port, and will permanently drop | |
285 | * them when the port has been created (actually, when the connection | |
286 | * has been made, as we may need to create the port several times). | |
287 | */ | |
63bd8c36 | 288 | temporarily_use_uid(pw); |
5260325f | 289 | |
aa3378df | 290 | /* |
291 | * Set our umask to something reasonable, as some files are created | |
292 | * with the default umask. This will make them world-readable but | |
293 | * writable only by the owner, which is ok for all files for which we | |
294 | * don't set the modes explicitly. | |
295 | */ | |
5260325f | 296 | umask(022); |
297 | ||
5260325f | 298 | /* Initialize option structure to indicate that no values have been set. */ |
299 | initialize_options(&options); | |
300 | ||
301 | /* Parse command-line arguments. */ | |
302 | host = NULL; | |
303 | ||
5260325f | 304 | for (optind = 1; optind < ac; optind++) { |
305 | if (av[optind][0] != '-') { | |
306 | if (host) | |
307 | break; | |
308 | if ((cp = strchr(av[optind], '@'))) { | |
6ae2364d | 309 | if(cp == av[optind]) |
310 | usage(); | |
5260325f | 311 | options.user = av[optind]; |
312 | *cp = '\0'; | |
313 | host = ++cp; | |
314 | } else | |
315 | host = av[optind]; | |
316 | continue; | |
317 | } | |
318 | opt = av[optind][1]; | |
319 | if (!opt) | |
320 | usage(); | |
0490e609 | 321 | if (strchr("eilcmpLRDo", opt)) { /* options with arguments */ |
5260325f | 322 | optarg = av[optind] + 2; |
323 | if (strcmp(optarg, "") == 0) { | |
324 | if (optind >= ac - 1) | |
325 | usage(); | |
326 | optarg = av[++optind]; | |
327 | } | |
328 | } else { | |
329 | if (av[optind][2]) | |
330 | usage(); | |
331 | optarg = NULL; | |
332 | } | |
333 | switch (opt) { | |
1f3bf5aa | 334 | case '1': |
335 | options.protocol = SSH_PROTO_1; | |
336 | break; | |
6ae2364d | 337 | case '2': |
338 | options.protocol = SSH_PROTO_2; | |
339 | break; | |
48e671d5 | 340 | case '4': |
341 | IPv4or6 = AF_INET; | |
342 | break; | |
48e671d5 | 343 | case '6': |
344 | IPv4or6 = AF_INET6; | |
345 | break; | |
5260325f | 346 | case 'n': |
347 | stdin_null_flag = 1; | |
348 | break; | |
5260325f | 349 | case 'f': |
350 | fork_after_authentication_flag = 1; | |
351 | stdin_null_flag = 1; | |
352 | break; | |
5260325f | 353 | case 'x': |
354 | options.forward_x11 = 0; | |
355 | break; | |
5260325f | 356 | case 'X': |
357 | options.forward_x11 = 1; | |
358 | break; | |
5260325f | 359 | case 'g': |
360 | options.gateway_ports = 1; | |
361 | break; | |
5260325f | 362 | case 'P': |
363 | options.use_privileged_port = 0; | |
364 | break; | |
5260325f | 365 | case 'a': |
366 | options.forward_agent = 0; | |
367 | break; | |
71276795 | 368 | case 'A': |
369 | options.forward_agent = 1; | |
370 | break; | |
5260325f | 371 | #ifdef AFS |
372 | case 'k': | |
373 | options.kerberos_tgt_passing = 0; | |
374 | options.afs_token_passing = 0; | |
375 | break; | |
376 | #endif | |
377 | case 'i': | |
378 | if (stat(optarg, &st) < 0) { | |
379 | fprintf(stderr, "Warning: Identity file %s does not exist.\n", | |
fa08c86b | 380 | optarg); |
5260325f | 381 | break; |
382 | } | |
383 | if (options.num_identity_files >= SSH_MAX_IDENTITY_FILES) | |
384 | fatal("Too many identity files specified (max %d)", | |
fa08c86b | 385 | SSH_MAX_IDENTITY_FILES); |
386 | options.identity_files[options.num_identity_files++] = xstrdup(optarg); | |
5260325f | 387 | break; |
5260325f | 388 | case 't': |
8abcdba4 | 389 | if (tty_flag) |
390 | force_tty_flag = 1; | |
5260325f | 391 | tty_flag = 1; |
392 | break; | |
5260325f | 393 | case 'v': |
bcbf86ec | 394 | if (0 == debug_flag) { |
395 | debug_flag = 1; | |
396 | options.log_level = SYSLOG_LEVEL_DEBUG1; | |
397 | } else if (options.log_level < SYSLOG_LEVEL_DEBUG3) { | |
398 | options.log_level++; | |
399 | break; | |
400 | } else { | |
54b974dc | 401 | fatal("Too high debugging level."); |
bcbf86ec | 402 | } |
403 | /* fallthrough */ | |
5260325f | 404 | case 'V': |
e68225b2 | 405 | fprintf(stderr, |
406 | "%s, SSH protocols %d.%d/%d.%d, OpenSSL 0x%8.8lx\n", | |
a8be9f80 | 407 | SSH_VERSION, |
408 | PROTOCOL_MAJOR_1, PROTOCOL_MINOR_1, | |
e68225b2 | 409 | PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2, |
410 | SSLeay()); | |
5260325f | 411 | if (opt == 'V') |
412 | exit(0); | |
5260325f | 413 | break; |
5260325f | 414 | case 'q': |
415 | options.log_level = SYSLOG_LEVEL_QUIET; | |
416 | break; | |
5260325f | 417 | case 'e': |
418 | if (optarg[0] == '^' && optarg[2] == 0 && | |
1e3b8b07 | 419 | (u_char) optarg[1] >= 64 && (u_char) optarg[1] < 128) |
420 | options.escape_char = (u_char) optarg[1] & 31; | |
5260325f | 421 | else if (strlen(optarg) == 1) |
1e3b8b07 | 422 | options.escape_char = (u_char) optarg[0]; |
5260325f | 423 | else if (strcmp(optarg, "none") == 0) |
424 | options.escape_char = -2; | |
425 | else { | |
426 | fprintf(stderr, "Bad escape character '%s'.\n", optarg); | |
427 | exit(1); | |
428 | } | |
429 | break; | |
5260325f | 430 | case 'c': |
a306f2dd | 431 | if (ciphers_valid(optarg)) { |
432 | /* SSH2 only */ | |
433 | options.ciphers = xstrdup(optarg); | |
d0c832f3 | 434 | options.cipher = SSH_CIPHER_ILLEGAL; |
a306f2dd | 435 | } else { |
436 | /* SSH1 only */ | |
c523303b | 437 | options.cipher = cipher_number(optarg); |
438 | if (options.cipher == -1) { | |
a306f2dd | 439 | fprintf(stderr, "Unknown cipher type '%s'\n", optarg); |
440 | exit(1); | |
441 | } | |
c523303b | 442 | if (options.cipher == SSH_CIPHER_3DES) { |
443 | options.ciphers = "3des-cbc"; | |
444 | } else if (options.cipher == SSH_CIPHER_BLOWFISH) { | |
445 | options.ciphers = "blowfish-cbc"; | |
446 | } else { | |
447 | options.ciphers = (char *)-1; | |
448 | } | |
5260325f | 449 | } |
450 | break; | |
b2552997 | 451 | case 'm': |
452 | if (mac_valid(optarg)) | |
453 | options.macs = xstrdup(optarg); | |
454 | else { | |
455 | fprintf(stderr, "Unknown mac type '%s'\n", optarg); | |
456 | exit(1); | |
457 | } | |
458 | break; | |
5260325f | 459 | case 'p': |
6031af8d | 460 | options.port = strtol(optarg, &endofnumber, 0); |
461 | if (optarg == endofnumber) { | |
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) { | |
5260325f | 474 | fprintf(stderr, "Bad forwarding specification '%s'.\n", optarg); |
475 | usage(); | |
476 | /* NOTREACHED */ | |
477 | } | |
478 | add_remote_forward(&options, fwd_port, buf, fwd_host_port); | |
479 | break; | |
5260325f | 480 | case 'L': |
48e671d5 | 481 | if (sscanf(optarg, "%hu/%255[^/]/%hu", &fwd_port, buf, |
482 | &fwd_host_port) != 3 && | |
483 | sscanf(optarg, "%hu:%255[^:]:%hu", &fwd_port, buf, | |
484 | &fwd_host_port) != 3) { | |
5260325f | 485 | fprintf(stderr, "Bad forwarding specification '%s'.\n", optarg); |
486 | usage(); | |
487 | /* NOTREACHED */ | |
488 | } | |
489 | add_local_forward(&options, fwd_port, buf, fwd_host_port); | |
490 | break; | |
0490e609 | 491 | |
492 | case 'D': | |
6031af8d | 493 | fwd_port = strtol(optarg, &endofnumber, 0); |
494 | if (optarg == endofnumber) { | |
495 | fprintf(stderr, "Bad port '%s'\n", optarg); | |
496 | exit(1); | |
497 | } | |
0490e609 | 498 | add_local_forward(&options, fwd_port, "socks4", 0); |
499 | break; | |
500 | ||
5260325f | 501 | case 'C': |
502 | options.compression = 1; | |
503 | break; | |
8ce64345 | 504 | case 'N': |
505 | no_shell_flag = 1; | |
506 | no_tty_flag = 1; | |
507 | break; | |
8ce64345 | 508 | case 'T': |
509 | no_tty_flag = 1; | |
510 | break; | |
5260325f | 511 | case 'o': |
512 | dummy = 1; | |
513 | if (process_config_line(&options, host ? host : "", optarg, | |
514 | "command-line", 0, &dummy) != 0) | |
515 | exit(1); | |
516 | break; | |
ae810de7 | 517 | case 's': |
518 | subsystem_flag = 1; | |
519 | break; | |
5260325f | 520 | default: |
521 | usage(); | |
522 | } | |
523 | } | |
524 | ||
525 | /* Check that we got a host name. */ | |
526 | if (!host) | |
8efc0c15 | 527 | usage(); |
5260325f | 528 | |
22d89d24 | 529 | SSLeay_add_all_algorithms(); |
fa08c86b | 530 | ERR_load_crypto_strings(); |
22d89d24 | 531 | |
5260325f | 532 | /* Initialize the command to execute on remote host. */ |
533 | buffer_init(&command); | |
534 | ||
aa3378df | 535 | /* |
536 | * Save the command to execute on the remote host in a buffer. There | |
537 | * is no limit on the length of the command, except by the maximum | |
538 | * packet size. Also sets the tty flag if there is no command. | |
539 | */ | |
5260325f | 540 | if (optind == ac) { |
541 | /* No command specified - execute shell on a tty. */ | |
542 | tty_flag = 1; | |
ae810de7 | 543 | if (subsystem_flag) { |
544 | fprintf(stderr, "You must specify a subsystem to invoke."); | |
545 | usage(); | |
546 | } | |
5260325f | 547 | } else { |
548 | /* A command has been specified. Store it into the | |
549 | buffer. */ | |
550 | for (i = optind; i < ac; i++) { | |
551 | if (i > optind) | |
552 | buffer_append(&command, " ", 1); | |
553 | buffer_append(&command, av[i], strlen(av[i])); | |
554 | } | |
8efc0c15 | 555 | } |
5260325f | 556 | |
557 | /* Cannot fork to background if no command. */ | |
14a9a859 | 558 | if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag) |
5260325f | 559 | fatal("Cannot fork into background without a command to execute."); |
560 | ||
561 | /* Allocate a tty by default if no command specified. */ | |
562 | if (buffer_len(&command) == 0) | |
563 | tty_flag = 1; | |
564 | ||
0b6fbf03 | 565 | /* Force no tty*/ |
566 | if (no_tty_flag) | |
567 | tty_flag = 0; | |
5260325f | 568 | /* Do not allocate a tty if stdin is not a tty. */ |
8abcdba4 | 569 | if (!isatty(fileno(stdin)) && !force_tty_flag) { |
5260325f | 570 | if (tty_flag) |
54b974dc | 571 | log("Pseudo-terminal will not be allocated because stdin is not a terminal."); |
5260325f | 572 | tty_flag = 0; |
573 | } | |
8ce64345 | 574 | |
20244695 | 575 | /* |
576 | * Initialize "log" output. Since we are the client all output | |
577 | * actually goes to stderr. | |
578 | */ | |
579 | log_init(av[0], SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_USER, 1); | |
5260325f | 580 | |
581 | /* Read per-user configuration file. */ | |
42f11eb2 | 582 | snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, _PATH_SSH_USER_CONFFILE); |
5260325f | 583 | read_config_file(buf, host, &options); |
584 | ||
585 | /* Read systemwide configuration file. */ | |
42f11eb2 | 586 | read_config_file(_PATH_HOST_CONFIG_FILE, host, &options); |
5260325f | 587 | |
588 | /* Fill configuration defaults. */ | |
589 | fill_default_options(&options); | |
590 | ||
591 | /* reinit */ | |
20244695 | 592 | log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 1); |
5260325f | 593 | |
e339aa53 | 594 | seed_rng(); |
595 | ||
5260325f | 596 | if (options.user == NULL) |
597 | options.user = xstrdup(pw->pw_name); | |
598 | ||
599 | if (options.hostname != NULL) | |
600 | host = options.hostname; | |
601 | ||
5260325f | 602 | /* Disable rhosts authentication if not running as root. */ |
3c62e7eb | 603 | #ifdef HAVE_CYGWIN |
604 | /* Ignore uid if running under Windows */ | |
605 | if (!options.use_privileged_port) { | |
606 | #else | |
5260325f | 607 | if (original_effective_uid != 0 || !options.use_privileged_port) { |
3c62e7eb | 608 | #endif |
6ffc9c88 | 609 | debug("Rhosts Authentication disabled, " |
610 | "originating port will not be trusted."); | |
5260325f | 611 | options.rhosts_authentication = 0; |
5260325f | 612 | } |
63bd8c36 | 613 | |
aa3378df | 614 | /* |
615 | * If using rsh has been selected, exec it now (without trying | |
616 | * anything else). Note that we must release privileges first. | |
617 | */ | |
5260325f | 618 | if (options.use_rsh) { |
aa3378df | 619 | /* |
620 | * Restore our superuser privileges. This must be done | |
621 | * before permanently setting the uid. | |
622 | */ | |
5260325f | 623 | restore_uid(); |
624 | ||
625 | /* Switch to the original uid permanently. */ | |
63bd8c36 | 626 | permanently_set_uid(pw); |
5260325f | 627 | |
628 | /* Execute rsh. */ | |
629 | rsh_connect(host, options.user, &command); | |
630 | fatal("rsh_connect returned"); | |
8efc0c15 | 631 | } |
5260325f | 632 | /* Restore our superuser privileges. */ |
633 | restore_uid(); | |
634 | ||
6ffc9c88 | 635 | /* Open a connection to the remote host. */ |
5260325f | 636 | |
637 | ok = ssh_connect(host, &hostaddr, options.port, | |
6ffc9c88 | 638 | options.connection_attempts, |
639 | original_effective_uid != 0 || !options.use_privileged_port, | |
63bd8c36 | 640 | pw, options.proxy_command); |
5260325f | 641 | |
aa3378df | 642 | /* |
643 | * If we successfully made the connection, load the host private key | |
644 | * in case we will need it later for combined rsa-rhosts | |
645 | * authentication. This must be done before releasing extra | |
646 | * privileges, because the file is only readable by root. | |
647 | */ | |
a306f2dd | 648 | if (ok && (options.protocol & SSH_PROTO_1)) { |
aeaa3d9e | 649 | host_private_key = key_load_private_type(KEY_RSA1, |
650 | _PATH_HOST_KEY_FILE, "", NULL); | |
5260325f | 651 | } |
aa3378df | 652 | /* |
653 | * Get rid of any extra privileges that we may have. We will no | |
654 | * longer need them. Also, extra privileges could make it very hard | |
655 | * to read identity files and other non-world-readable files from the | |
656 | * user's home directory if it happens to be on a NFS volume where | |
657 | * root is mapped to nobody. | |
658 | */ | |
659 | ||
660 | /* | |
661 | * Note that some legacy systems need to postpone the following call | |
662 | * to permanently_set_uid() until the private hostkey is destroyed | |
663 | * with RSA_free(). Otherwise the calling user could ptrace() the | |
664 | * process, read the private hostkey and impersonate the host. | |
665 | * OpenBSD does not allow ptracing of setuid processes. | |
666 | */ | |
63bd8c36 | 667 | permanently_set_uid(pw); |
5260325f | 668 | |
aa3378df | 669 | /* |
670 | * Now that we are back to our own permissions, create ~/.ssh | |
671 | * directory if it doesn\'t already exist. | |
672 | */ | |
42f11eb2 | 673 | snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, _PATH_SSH_USER_DIR); |
5260325f | 674 | if (stat(buf, &st) < 0) |
704b1659 | 675 | if (mkdir(buf, 0700) < 0) |
5260325f | 676 | error("Could not create directory '%.200s'.", buf); |
677 | ||
678 | /* Check if the connection failed, and try "rsh" if appropriate. */ | |
679 | if (!ok) { | |
680 | if (options.port != 0) | |
57112b5a | 681 | log("Secure connection to %.100s on port %hu refused%.100s.", |
5260325f | 682 | host, options.port, |
683 | options.fallback_to_rsh ? "; reverting to insecure method" : ""); | |
684 | else | |
685 | log("Secure connection to %.100s refused%.100s.", host, | |
686 | options.fallback_to_rsh ? "; reverting to insecure method" : ""); | |
687 | ||
688 | if (options.fallback_to_rsh) { | |
689 | rsh_connect(host, options.user, &command); | |
690 | fatal("rsh_connect returned"); | |
691 | } | |
692 | exit(1); | |
8efc0c15 | 693 | } |
fee56204 | 694 | /* load options.identity_files */ |
695 | load_public_identity_files(); | |
696 | ||
697 | /* Expand ~ in known host file names. */ | |
698 | /* XXX mem-leaks: */ | |
fa08c86b | 699 | options.system_hostfile = |
700 | tilde_expand_filename(options.system_hostfile, original_real_uid); | |
701 | options.user_hostfile = | |
702 | tilde_expand_filename(options.user_hostfile, original_real_uid); | |
703 | options.system_hostfile2 = | |
704 | tilde_expand_filename(options.system_hostfile2, original_real_uid); | |
705 | options.user_hostfile2 = | |
706 | tilde_expand_filename(options.user_hostfile2, original_real_uid); | |
5260325f | 707 | |
708 | /* Log into the remote system. This never returns if the login fails. */ | |
63bd8c36 | 709 | ssh_login(host_private_key, host, (struct sockaddr *)&hostaddr, pw); |
5260325f | 710 | |
711 | /* We no longer need the host private key. Clear it now. */ | |
aeaa3d9e | 712 | if (host_private_key != NULL) |
713 | key_free(host_private_key); /* Destroys contents safely */ | |
5260325f | 714 | |
8ce64345 | 715 | exit_status = compat20 ? ssh_session2() : ssh_session(); |
716 | packet_close(); | |
717 | return exit_status; | |
718 | } | |
719 | ||
0b242b12 | 720 | void |
721 | x11_get_proto(char *proto, int proto_len, char *data, int data_len) | |
722 | { | |
723 | char line[512]; | |
724 | FILE *f; | |
725 | int got_data = 0, i; | |
726 | ||
fa649821 | 727 | if (options.xauth_location) { |
728 | /* Try to get Xauthority information for the display. */ | |
5ca51e19 | 729 | snprintf(line, sizeof line, "%.100s list %.200s 2>" _PATH_DEVNULL, |
fa649821 | 730 | options.xauth_location, getenv("DISPLAY")); |
731 | f = popen(line, "r"); | |
732 | if (f && fgets(line, sizeof(line), f) && | |
733 | sscanf(line, "%*s %s %s", proto, data) == 2) | |
734 | got_data = 1; | |
735 | if (f) | |
736 | pclose(f); | |
737 | } | |
0b242b12 | 738 | /* |
739 | * If we didn't get authentication data, just make up some | |
740 | * data. The forwarding code will check the validity of the | |
741 | * response anyway, and substitute this data. The X11 | |
742 | * server, however, will ignore this fake data and use | |
743 | * whatever authentication mechanisms it was using otherwise | |
744 | * for the local connection. | |
745 | */ | |
746 | if (!got_data) { | |
747 | u_int32_t rand = 0; | |
748 | ||
749 | strlcpy(proto, "MIT-MAGIC-COOKIE-1", proto_len); | |
750 | for (i = 0; i < 16; i++) { | |
751 | if (i % 4 == 0) | |
752 | rand = arc4random(); | |
753 | snprintf(data + 2 * i, data_len - 2 * i, "%02x", rand & 0xff); | |
754 | rand >>= 8; | |
755 | } | |
756 | } | |
757 | } | |
758 | ||
fa08c86b | 759 | void |
760 | ssh_init_forwarding(void) | |
761 | { | |
02a024dd | 762 | int success = 0; |
fa08c86b | 763 | int i; |
02a024dd | 764 | |
fa08c86b | 765 | /* Initiate local TCP/IP port forwardings. */ |
766 | for (i = 0; i < options.num_local_forwards; i++) { | |
767 | debug("Connections to local port %d forwarded to remote address %.200s:%d", | |
768 | options.local_forwards[i].port, | |
769 | options.local_forwards[i].host, | |
770 | options.local_forwards[i].host_port); | |
02a024dd | 771 | success += channel_request_local_forwarding( |
fa08c86b | 772 | options.local_forwards[i].port, |
773 | options.local_forwards[i].host, | |
774 | options.local_forwards[i].host_port, | |
775 | options.gateway_ports); | |
776 | } | |
02a024dd | 777 | if (i > 0 && success == 0) |
778 | error("Could not request local forwarding."); | |
fa08c86b | 779 | |
780 | /* Initiate remote TCP/IP port forwardings. */ | |
781 | for (i = 0; i < options.num_remote_forwards; i++) { | |
782 | debug("Connections to remote port %d forwarded to local address %.200s:%d", | |
783 | options.remote_forwards[i].port, | |
784 | options.remote_forwards[i].host, | |
785 | options.remote_forwards[i].host_port); | |
786 | channel_request_remote_forwarding( | |
787 | options.remote_forwards[i].port, | |
788 | options.remote_forwards[i].host, | |
789 | options.remote_forwards[i].host_port); | |
790 | } | |
791 | } | |
792 | ||
793 | void | |
794 | check_agent_present(void) | |
795 | { | |
796 | if (options.forward_agent) { | |
797 | /* Clear agent forwarding if we don\'t have an agent. */ | |
798 | int authfd = ssh_get_authentication_socket(); | |
799 | if (authfd < 0) | |
800 | options.forward_agent = 0; | |
801 | else | |
802 | ssh_close_authentication_socket(authfd); | |
803 | } | |
804 | } | |
805 | ||
8ce64345 | 806 | int |
807 | ssh_session(void) | |
808 | { | |
809 | int type; | |
8ce64345 | 810 | int plen; |
811 | int interactive = 0; | |
812 | int have_tty = 0; | |
813 | struct winsize ws; | |
8ce64345 | 814 | char *cp; |
815 | ||
5260325f | 816 | /* Enable compression if requested. */ |
817 | if (options.compression) { | |
818 | debug("Requesting compression at level %d.", options.compression_level); | |
819 | ||
820 | if (options.compression_level < 1 || options.compression_level > 9) | |
821 | fatal("Compression level must be from 1 (fast) to 9 (slow, best)."); | |
822 | ||
823 | /* Send the request. */ | |
824 | packet_start(SSH_CMSG_REQUEST_COMPRESSION); | |
825 | packet_put_int(options.compression_level); | |
826 | packet_send(); | |
827 | packet_write_wait(); | |
828 | type = packet_read(&plen); | |
829 | if (type == SSH_SMSG_SUCCESS) | |
830 | packet_start_compression(options.compression_level); | |
831 | else if (type == SSH_SMSG_FAILURE) | |
832 | log("Warning: Remote host refused compression."); | |
833 | else | |
834 | packet_disconnect("Protocol error waiting for compression response."); | |
835 | } | |
836 | /* Allocate a pseudo tty if appropriate. */ | |
837 | if (tty_flag) { | |
838 | debug("Requesting pty."); | |
839 | ||
840 | /* Start the packet. */ | |
841 | packet_start(SSH_CMSG_REQUEST_PTY); | |
842 | ||
843 | /* Store TERM in the packet. There is no limit on the | |
844 | length of the string. */ | |
845 | cp = getenv("TERM"); | |
846 | if (!cp) | |
847 | cp = ""; | |
848 | packet_put_string(cp, strlen(cp)); | |
849 | ||
850 | /* Store window size in the packet. */ | |
851 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) | |
852 | memset(&ws, 0, sizeof(ws)); | |
853 | packet_put_int(ws.ws_row); | |
854 | packet_put_int(ws.ws_col); | |
855 | packet_put_int(ws.ws_xpixel); | |
856 | packet_put_int(ws.ws_ypixel); | |
857 | ||
858 | /* Store tty modes in the packet. */ | |
859 | tty_make_modes(fileno(stdin)); | |
860 | ||
861 | /* Send the packet, and wait for it to leave. */ | |
862 | packet_send(); | |
863 | packet_write_wait(); | |
864 | ||
865 | /* Read response from the server. */ | |
866 | type = packet_read(&plen); | |
4fe2af09 | 867 | if (type == SSH_SMSG_SUCCESS) { |
5260325f | 868 | interactive = 1; |
8ce64345 | 869 | have_tty = 1; |
4fe2af09 | 870 | } else if (type == SSH_SMSG_FAILURE) |
5260325f | 871 | log("Warning: Remote host failed or refused to allocate a pseudo tty."); |
872 | else | |
873 | packet_disconnect("Protocol error waiting for pty request response."); | |
874 | } | |
875 | /* Request X11 forwarding if enabled and DISPLAY is set. */ | |
876 | if (options.forward_x11 && getenv("DISPLAY") != NULL) { | |
0b242b12 | 877 | char proto[512], data[512]; |
878 | /* Get reasonable local authentication information. */ | |
879 | x11_get_proto(proto, sizeof proto, data, sizeof data); | |
880 | /* Request forwarding with authentication spoofing. */ | |
5260325f | 881 | debug("Requesting X11 forwarding with authentication spoofing."); |
0b242b12 | 882 | x11_request_forwarding_with_spoofing(0, proto, data); |
5260325f | 883 | |
884 | /* Read response from the server. */ | |
885 | type = packet_read(&plen); | |
886 | if (type == SSH_SMSG_SUCCESS) { | |
5260325f | 887 | interactive = 1; |
0b242b12 | 888 | } else if (type == SSH_SMSG_FAILURE) { |
5260325f | 889 | log("Warning: Remote host denied X11 forwarding."); |
0b242b12 | 890 | } else { |
5260325f | 891 | packet_disconnect("Protocol error waiting for X11 forwarding"); |
0b242b12 | 892 | } |
5260325f | 893 | } |
894 | /* Tell the packet module whether this is an interactive session. */ | |
b5c334cc | 895 | packet_set_interactive(interactive); |
5260325f | 896 | |
897 | /* Request authentication agent forwarding if appropriate. */ | |
fa08c86b | 898 | check_agent_present(); |
899 | ||
5260325f | 900 | if (options.forward_agent) { |
901 | debug("Requesting authentication agent forwarding."); | |
902 | auth_request_forwarding(); | |
903 | ||
904 | /* Read response from the server. */ | |
905 | type = packet_read(&plen); | |
906 | packet_integrity_check(plen, 0, type); | |
907 | if (type != SSH_SMSG_SUCCESS) | |
908 | log("Warning: Remote host denied authentication agent forwarding."); | |
909 | } | |
8efc0c15 | 910 | |
fa08c86b | 911 | /* Initiate port forwardings. */ |
912 | ssh_init_forwarding(); | |
5260325f | 913 | |
aa3378df | 914 | /* If requested, let ssh continue in the background. */ |
6ae2364d | 915 | if (fork_after_authentication_flag) |
aa3378df | 916 | if (daemon(1, 1) < 0) |
917 | fatal("daemon() failed: %.200s", strerror(errno)); | |
918 | ||
919 | /* | |
920 | * If a command was specified on the command line, execute the | |
921 | * command now. Otherwise request the server to start a shell. | |
922 | */ | |
5260325f | 923 | if (buffer_len(&command) > 0) { |
924 | int len = buffer_len(&command); | |
925 | if (len > 900) | |
926 | len = 900; | |
927 | debug("Sending command: %.*s", len, buffer_ptr(&command)); | |
928 | packet_start(SSH_CMSG_EXEC_CMD); | |
929 | packet_put_string(buffer_ptr(&command), buffer_len(&command)); | |
930 | packet_send(); | |
931 | packet_write_wait(); | |
932 | } else { | |
933 | debug("Requesting shell."); | |
934 | packet_start(SSH_CMSG_EXEC_SHELL); | |
935 | packet_send(); | |
936 | packet_write_wait(); | |
937 | } | |
938 | ||
939 | /* Enter the interactive session. */ | |
2e73a022 | 940 | return client_loop(have_tty, tty_flag ? options.escape_char : -1, 0); |
8ce64345 | 941 | } |
5260325f | 942 | |
1f3bf5aa | 943 | void |
944 | client_subsystem_reply(int type, int plen, void *ctxt) | |
945 | { | |
946 | int id, len; | |
947 | ||
948 | id = packet_get_int(); | |
949 | len = buffer_len(&command); | |
ce91d6f8 | 950 | if (len > 900) |
951 | len = 900; | |
1f3bf5aa | 952 | packet_done(); |
953 | if (type == SSH2_MSG_CHANNEL_FAILURE) | |
954 | fatal("Request for subsystem '%.*s' failed on channel %d", | |
955 | len, buffer_ptr(&command), id); | |
956 | } | |
957 | ||
8ce64345 | 958 | void |
fa08c86b | 959 | ssh_session2_callback(int id, void *arg) |
8ce64345 | 960 | { |
961 | int len; | |
b5c334cc | 962 | int interactive = 0; |
963 | ||
6a416424 | 964 | debug("client_init id %d arg %ld", id, (long)arg); |
8ce64345 | 965 | |
8ce64345 | 966 | if (tty_flag) { |
967 | struct winsize ws; | |
968 | char *cp; | |
969 | cp = getenv("TERM"); | |
970 | if (!cp) | |
971 | cp = ""; | |
972 | /* Store window size in the packet. */ | |
973 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) | |
974 | memset(&ws, 0, sizeof(ws)); | |
975 | ||
976 | channel_request_start(id, "pty-req", 0); | |
977 | packet_put_cstring(cp); | |
978 | packet_put_int(ws.ws_col); | |
979 | packet_put_int(ws.ws_row); | |
980 | packet_put_int(ws.ws_xpixel); | |
981 | packet_put_int(ws.ws_ypixel); | |
982 | packet_put_cstring(""); /* XXX: encode terminal modes */ | |
983 | packet_send(); | |
b5c334cc | 984 | interactive = 1; |
8ce64345 | 985 | /* XXX wait for reply */ |
986 | } | |
0b242b12 | 987 | if (options.forward_x11 && |
988 | getenv("DISPLAY") != NULL) { | |
989 | char proto[512], data[512]; | |
990 | /* Get reasonable local authentication information. */ | |
991 | x11_get_proto(proto, sizeof proto, data, sizeof data); | |
992 | /* Request forwarding with authentication spoofing. */ | |
993 | debug("Requesting X11 forwarding with authentication spoofing."); | |
994 | x11_request_forwarding_with_spoofing(id, proto, data); | |
b5c334cc | 995 | interactive = 1; |
0b242b12 | 996 | /* XXX wait for reply */ |
997 | } | |
998 | ||
fa08c86b | 999 | check_agent_present(); |
1000 | if (options.forward_agent) { | |
1001 | debug("Requesting authentication agent forwarding."); | |
1002 | channel_request_start(id, "auth-agent-req@openssh.com", 0); | |
1003 | packet_send(); | |
1004 | } | |
1005 | ||
8ce64345 | 1006 | len = buffer_len(&command); |
1007 | if (len > 0) { | |
1008 | if (len > 900) | |
1009 | len = 900; | |
ae810de7 | 1010 | if (subsystem_flag) { |
1011 | debug("Sending subsystem: %.*s", len, buffer_ptr(&command)); | |
1f3bf5aa | 1012 | channel_request_start(id, "subsystem", /*want reply*/ 1); |
1013 | /* register callback for reply */ | |
1014 | /* XXX we asume that client_loop has already been called */ | |
1015 | dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &client_subsystem_reply); | |
1016 | dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &client_subsystem_reply); | |
ae810de7 | 1017 | } else { |
1018 | debug("Sending command: %.*s", len, buffer_ptr(&command)); | |
1019 | channel_request_start(id, "exec", 0); | |
1020 | } | |
ce91d6f8 | 1021 | packet_put_string(buffer_ptr(&command), buffer_len(&command)); |
8ce64345 | 1022 | packet_send(); |
1023 | } else { | |
1024 | channel_request(id, "shell", 0); | |
1025 | } | |
1026 | /* channel_callback(id, SSH2_MSG_OPEN_CONFIGMATION, client_init, 0); */ | |
1f3bf5aa | 1027 | |
8ce64345 | 1028 | /* register different callback, etc. XXX */ |
b5c334cc | 1029 | packet_set_interactive(interactive); |
8ce64345 | 1030 | } |
1031 | ||
1032 | int | |
eb0dd41f | 1033 | ssh_session2_command(void) |
8ce64345 | 1034 | { |
eb0dd41f | 1035 | int id, window, packetmax; |
2e73a022 | 1036 | int in, out, err; |
1037 | ||
14a9a859 | 1038 | if (stdin_null_flag) { |
5ca51e19 | 1039 | in = open(_PATH_DEVNULL, O_RDONLY); |
14a9a859 | 1040 | } else { |
1041 | in = dup(STDIN_FILENO); | |
1042 | } | |
2e73a022 | 1043 | out = dup(STDOUT_FILENO); |
1044 | err = dup(STDERR_FILENO); | |
8ce64345 | 1045 | |
1046 | if (in < 0 || out < 0 || err < 0) | |
14a9a859 | 1047 | fatal("dup() in/out/err failed"); |
8ce64345 | 1048 | |
a22aff1f | 1049 | /* enable nonblocking unless tty */ |
1050 | if (!isatty(in)) | |
1051 | set_nonblock(in); | |
1052 | if (!isatty(out)) | |
1053 | set_nonblock(out); | |
1054 | if (!isatty(err)) | |
1055 | set_nonblock(err); | |
1056 | ||
bcbf86ec | 1057 | window = CHAN_SES_WINDOW_DEFAULT; |
1058 | packetmax = CHAN_SES_PACKET_DEFAULT; | |
1059 | if (!tty_flag) { | |
8ce64345 | 1060 | window *= 2; |
bcbf86ec | 1061 | packetmax *=2; |
8ce64345 | 1062 | } |
8ce64345 | 1063 | id = channel_new( |
1064 | "session", SSH_CHANNEL_OPENING, in, out, err, | |
bcbf86ec | 1065 | window, packetmax, CHAN_EXTENDED_WRITE, |
a22aff1f | 1066 | xstrdup("client-session"), /*nonblock*/0); |
8ce64345 | 1067 | |
eb0dd41f | 1068 | debug("channel_new: %d", id); |
1069 | ||
8ce64345 | 1070 | channel_open(id); |
fa08c86b | 1071 | channel_register_callback(id, SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, |
1072 | ssh_session2_callback, (void *)0); | |
5260325f | 1073 | |
eb0dd41f | 1074 | return id; |
1075 | } | |
1076 | ||
1077 | int | |
1078 | ssh_session2(void) | |
1079 | { | |
1080 | int id; | |
1081 | ||
1082 | /* XXX should be pre-session */ | |
1083 | ssh_init_forwarding(); | |
1084 | ||
1085 | id = no_shell_flag ? -1 : ssh_session2_command(); | |
1086 | ||
1087 | /* If requested, let ssh continue in the background. */ | |
1088 | if (fork_after_authentication_flag) | |
1089 | if (daemon(1, 1) < 0) | |
1090 | fatal("daemon() failed: %.200s", strerror(errno)); | |
1091 | ||
2e73a022 | 1092 | return client_loop(tty_flag, tty_flag ? options.escape_char : -1, id); |
8efc0c15 | 1093 | } |
fa08c86b | 1094 | |
fee56204 | 1095 | void |
1096 | load_public_identity_files(void) | |
1097 | { | |
1098 | char *filename; | |
1099 | Key *public; | |
1100 | int i; | |
1101 | ||
1102 | for (i = 0; i < options.num_identity_files; i++) { | |
1103 | filename = tilde_expand_filename(options.identity_files[i], | |
1104 | original_real_uid); | |
aeaa3d9e | 1105 | public = key_load_public(filename, NULL); |
fee56204 | 1106 | debug("identity file %s type %d", filename, |
1107 | public ? public->type : -1); | |
1108 | xfree(options.identity_files[i]); | |
1109 | options.identity_files[i] = filename; | |
1110 | options.identity_keys[i] = public; | |
1111 | } | |
1112 | } |