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799ae497 1/* $OpenBSD: ssh.c,v 1.295 2007/01/03 03:01:40 stevesk Exp $ */
3c0ef626 2/*
3 * Author: Tatu Ylonen <ylo@cs.hut.fi>
4 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5 * All rights reserved
6 * Ssh client program. This program can be used to log into a remote machine.
7 * The software supports strong authentication, encryption, and forwarding
8 * of X11, TCP/IP, and authentication connections.
9 *
10 * As far as I am concerned, the code I have written for this software
11 * can be used freely for any purpose. Any derived versions of this
12 * software must be clearly marked as such, and if the derived work is
13 * incompatible with the protocol description in the RFC file, it must be
14 * called by a name other than "ssh" or "Secure Shell".
15 *
16 * Copyright (c) 1999 Niels Provos. All rights reserved.
cdd66111 17 * Copyright (c) 2000, 2001, 2002, 2003 Markus Friedl. All rights reserved.
3c0ef626 18 *
19 * Modified to work with SSL by Niels Provos <provos@citi.umich.edu>
20 * in Canada (German citizen).
21 *
22 * Redistribution and use in source and binary forms, with or without
23 * modification, are permitted provided that the following conditions
24 * are met:
25 * 1. Redistributions of source code must retain the above copyright
26 * notice, this list of conditions and the following disclaimer.
27 * 2. Redistributions in binary form must reproduce the above copyright
28 * notice, this list of conditions and the following disclaimer in the
29 * documentation and/or other materials provided with the distribution.
30 *
31 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
32 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
33 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
34 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
35 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
36 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
37 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
38 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
39 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
40 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
41 */
42
43#include "includes.h"
9108f8d9 44
45#include <sys/types.h>
46#ifdef HAVE_SYS_STAT_H
47# include <sys/stat.h>
48#endif
49#include <sys/resource.h>
50#include <sys/ioctl.h>
51#include <sys/socket.h>
52#include <sys/un.h>
53
54#include <ctype.h>
55#include <errno.h>
56#include <fcntl.h>
57#include <netdb.h>
58#ifdef HAVE_PATHS_H
59#include <paths.h>
60#endif
61#include <pwd.h>
62#include <signal.h>
63#include <stdarg.h>
64#include <stddef.h>
65#include <stdio.h>
66#include <stdlib.h>
67#include <string.h>
68#include <unistd.h>
69
70#include <netinet/in.h>
71#include <arpa/inet.h>
3c0ef626 72
73#include <openssl/evp.h>
74#include <openssl/err.h>
75
9108f8d9 76#include "xmalloc.h"
3c0ef626 77#include "ssh.h"
78#include "ssh1.h"
79#include "ssh2.h"
80#include "compat.h"
81#include "cipher.h"
3c0ef626 82#include "packet.h"
83#include "buffer.h"
3c0ef626 84#include "channels.h"
85#include "key.h"
86#include "authfd.h"
87#include "authfile.h"
88#include "pathnames.h"
c9f39d2c 89#include "dispatch.h"
3c0ef626 90#include "clientloop.h"
91#include "log.h"
92#include "readconf.h"
93#include "sshconnect.h"
3c0ef626 94#include "misc.h"
95#include "kex.h"
96#include "mac.h"
c9f39d2c 97#include "sshpty.h"
98#include "match.h"
99#include "msg.h"
100#include "monitor_fdpass.h"
101#include "uidswap.h"
9108f8d9 102#include "version.h"
3c0ef626 103
104#ifdef SMARTCARD
3c0ef626 105#include "scard.h"
106#endif
107
3c0ef626 108extern char *__progname;
3c0ef626 109
3c0ef626 110/* Flag indicating whether debug mode is on. This can be set on the command line. */
111int debug_flag = 0;
112
113/* Flag indicating whether a tty should be allocated */
114int tty_flag = 0;
115int no_tty_flag = 0;
116int force_tty_flag = 0;
117
118/* don't exec a shell */
119int no_shell_flag = 0;
120
121/*
122 * Flag indicating that nothing should be read from stdin. This can be set
123 * on the command line.
124 */
125int stdin_null_flag = 0;
126
127/*
128 * Flag indicating that ssh should fork after authentication. This is useful
f5799ae1 129 * so that the passphrase can be entered manually, and then ssh goes to the
3c0ef626 130 * background.
131 */
132int fork_after_authentication_flag = 0;
133
134/*
135 * General data structure for command line options and options configurable
136 * in configuration files. See readconf.h.
137 */
138Options options;
139
140/* optional user configfile */
141char *config = NULL;
142
143/*
144 * Name of the host we are connecting to. This is the name given on the
145 * command line, or the HostName specified for the user-supplied name in a
146 * configuration file.
147 */
148char *host;
149
150/* socket address the host resolves to */
151struct sockaddr_storage hostaddr;
152
153/* Private host keys. */
f5799ae1 154Sensitive sensitive_data;
3c0ef626 155
156/* Original real UID. */
157uid_t original_real_uid;
f5799ae1 158uid_t original_effective_uid;
3c0ef626 159
160/* command to be executed */
161Buffer command;
162
163/* Should we execute a command or invoke a subsystem? */
164int subsystem_flag = 0;
165
700318f3 166/* # of replies received for global requests */
167static int client_global_request_id = 0;
168
41b2f314 169/* pid of proxycommand child process */
170pid_t proxy_command_pid = 0;
171
c9f39d2c 172/* fd to control socket */
173int control_fd = -1;
174
996d5e62 175/* Multiplexing control command */
665a873d 176static u_int mux_command = 0;
996d5e62 177
c9f39d2c 178/* Only used in control client mode */
179volatile sig_atomic_t control_client_terminate = 0;
180u_int control_server_pid = 0;
181
3c0ef626 182/* Prints a help message to the user. This function never returns. */
183
184static void
185usage(void)
186{
99be0775 187 fprintf(stderr,
996d5e62 188"usage: ssh [-1246AaCfgkMNnqsTtVvXxY] [-b bind_address] [-c cipher_spec]\n"
2c06c99b 189" [-D [bind_address:]port] [-e escape_char] [-F configfile]\n"
996d5e62 190" [-i identity_file] [-L [bind_address:]port:host:hostport]\n"
191" [-l login_name] [-m mac_spec] [-O ctl_cmd] [-o option] [-p port]\n"
192" [-R [bind_address:]port:host:hostport] [-S ctl_path]\n"
9108f8d9 193" [-w local_tun[:remote_tun]] [user@]hostname [command]\n"
99be0775 194 );
2c06c99b 195 exit(255);
3c0ef626 196}
197
3c0ef626 198static int ssh_session(void);
199static int ssh_session2(void);
200static void load_public_identity_files(void);
c9f39d2c 201static void control_client(const char *path);
3c0ef626 202
203/*
204 * Main program for the ssh client.
205 */
206int
207main(int ac, char **av)
208{
f5799ae1 209 int i, opt, exit_status;
cdd66111 210 char *p, *cp, *line, buf[256];
3c0ef626 211 struct stat st;
212 struct passwd *pw;
213 int dummy;
3c0ef626 214 extern int optind, optreset;
215 extern char *optarg;
665a873d 216 struct servent *sp;
996d5e62 217 Forward fwd;
3c0ef626 218
2c06c99b 219 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
220 sanitise_stdfd();
221
0fff78ff 222 __progname = ssh_get_progname(av[0]);
3c0ef626 223 init_rng();
224
225 /*
226 * Save the original real uid. It will be needed later (uid-swapping
227 * may clobber the real uid).
228 */
229 original_real_uid = getuid();
230 original_effective_uid = geteuid();
cdd66111 231
41b2f314 232 /*
233 * Use uid-swapping to give up root privileges for the duration of
234 * option processing. We will re-instantiate the rights when we are
235 * ready to create the privileged port, and will permanently drop
236 * them when the port has been created (actually, when the connection
237 * has been made, as we may need to create the port several times).
238 */
239 PRIV_END;
3c0ef626 240
241#ifdef HAVE_SETRLIMIT
242 /* If we are installed setuid root be careful to not drop core. */
243 if (original_real_uid != original_effective_uid) {
244 struct rlimit rlim;
245 rlim.rlim_cur = rlim.rlim_max = 0;
246 if (setrlimit(RLIMIT_CORE, &rlim) < 0)
247 fatal("setrlimit failed: %.100s", strerror(errno));
248 }
249#endif
250 /* Get user data. */
251 pw = getpwuid(original_real_uid);
252 if (!pw) {
0fff78ff 253 logit("You don't exist, go away!");
2c06c99b 254 exit(255);
3c0ef626 255 }
256 /* Take a copy of the returned structure. */
257 pw = pwcopy(pw);
258
3c0ef626 259 /*
260 * Set our umask to something reasonable, as some files are created
261 * with the default umask. This will make them world-readable but
262 * writable only by the owner, which is ok for all files for which we
263 * don't set the modes explicitly.
264 */
265 umask(022);
266
267 /* Initialize option structure to indicate that no values have been set. */
268 initialize_options(&options);
269
270 /* Parse command-line arguments. */
271 host = NULL;
272
9108f8d9 273 again:
3c0ef626 274 while ((opt = getopt(ac, av,
2c06c99b 275 "1246ab:c:e:fgi:kl:m:no:p:qstvxACD:F:I:L:MNO:PR:S:TVw:XY")) != -1) {
3c0ef626 276 switch (opt) {
277 case '1':
278 options.protocol = SSH_PROTO_1;
279 break;
280 case '2':
281 options.protocol = SSH_PROTO_2;
282 break;
283 case '4':
0fff78ff 284 options.address_family = AF_INET;
3c0ef626 285 break;
286 case '6':
0fff78ff 287 options.address_family = AF_INET6;
3c0ef626 288 break;
289 case 'n':
290 stdin_null_flag = 1;
291 break;
292 case 'f':
293 fork_after_authentication_flag = 1;
294 stdin_null_flag = 1;
295 break;
296 case 'x':
297 options.forward_x11 = 0;
298 break;
299 case 'X':
300 options.forward_x11 = 1;
301 break;
cdd66111 302 case 'Y':
303 options.forward_x11 = 1;
304 options.forward_x11_trusted = 1;
305 break;
3c0ef626 306 case 'g':
307 options.gateway_ports = 1;
308 break;
996d5e62 309 case 'O':
310 if (strcmp(optarg, "check") == 0)
311 mux_command = SSHMUX_COMMAND_ALIVE_CHECK;
312 else if (strcmp(optarg, "exit") == 0)
313 mux_command = SSHMUX_COMMAND_TERMINATE;
314 else
315 fatal("Invalid multiplex command.");
316 break;
41b2f314 317 case 'P': /* deprecated */
3c0ef626 318 options.use_privileged_port = 0;
319 break;
320 case 'a':
321 options.forward_agent = 0;
322 break;
323 case 'A':
324 options.forward_agent = 1;
325 break;
3c0ef626 326 case 'k':
cdd66111 327 options.gss_deleg_creds = 0;
3c0ef626 328 break;
3c0ef626 329 case 'i':
330 if (stat(optarg, &st) < 0) {
331 fprintf(stderr, "Warning: Identity file %s "
996d5e62 332 "not accessible: %s.\n", optarg,
333 strerror(errno));
3c0ef626 334 break;
335 }
336 if (options.num_identity_files >=
337 SSH_MAX_IDENTITY_FILES)
338 fatal("Too many identity files specified "
339 "(max %d)", SSH_MAX_IDENTITY_FILES);
340 options.identity_files[options.num_identity_files++] =
341 xstrdup(optarg);
342 break;
343 case 'I':
344#ifdef SMARTCARD
345 options.smartcard_device = xstrdup(optarg);
346#else
347 fprintf(stderr, "no support for smartcards.\n");
348#endif
349 break;
350 case 't':
351 if (tty_flag)
352 force_tty_flag = 1;
353 tty_flag = 1;
354 break;
355 case 'v':
0fff78ff 356 if (debug_flag == 0) {
3c0ef626 357 debug_flag = 1;
358 options.log_level = SYSLOG_LEVEL_DEBUG1;
0fff78ff 359 } else {
360 if (options.log_level < SYSLOG_LEVEL_DEBUG3)
361 options.log_level++;
3c0ef626 362 break;
0fff78ff 363 }
996d5e62 364 /* FALLTHROUGH */
3c0ef626 365 case 'V':
99be0775 366 fprintf(stderr, "%s, %s\n",
996d5e62 367 SSH_RELEASE, SSLeay_version(SSLEAY_VERSION));
3c0ef626 368 if (opt == 'V')
369 exit(0);
370 break;
2c06c99b 371 case 'w':
372 if (options.tun_open == -1)
373 options.tun_open = SSH_TUNMODE_DEFAULT;
374 options.tun_local = a2tun(optarg, &options.tun_remote);
375 if (options.tun_local == SSH_TUNID_ERR) {
376 fprintf(stderr, "Bad tun device '%s'\n", optarg);
377 exit(255);
378 }
379 break;
3c0ef626 380 case 'q':
381 options.log_level = SYSLOG_LEVEL_QUIET;
382 break;
383 case 'e':
384 if (optarg[0] == '^' && optarg[2] == 0 &&
385 (u_char) optarg[1] >= 64 &&
386 (u_char) optarg[1] < 128)
387 options.escape_char = (u_char) optarg[1] & 31;
388 else if (strlen(optarg) == 1)
389 options.escape_char = (u_char) optarg[0];
390 else if (strcmp(optarg, "none") == 0)
391 options.escape_char = SSH_ESCAPECHAR_NONE;
392 else {
393 fprintf(stderr, "Bad escape character '%s'.\n",
394 optarg);
2c06c99b 395 exit(255);
3c0ef626 396 }
397 break;
398 case 'c':
399 if (ciphers_valid(optarg)) {
400 /* SSH2 only */
401 options.ciphers = xstrdup(optarg);
c9f39d2c 402 options.cipher = SSH_CIPHER_INVALID;
3c0ef626 403 } else {
404 /* SSH1 only */
405 options.cipher = cipher_number(optarg);
406 if (options.cipher == -1) {
407 fprintf(stderr,
408 "Unknown cipher type '%s'\n",
409 optarg);
2c06c99b 410 exit(255);
3c0ef626 411 }
412 if (options.cipher == SSH_CIPHER_3DES)
413 options.ciphers = "3des-cbc";
414 else if (options.cipher == SSH_CIPHER_BLOWFISH)
415 options.ciphers = "blowfish-cbc";
416 else
417 options.ciphers = (char *)-1;
418 }
419 break;
420 case 'm':
421 if (mac_valid(optarg))
422 options.macs = xstrdup(optarg);
423 else {
424 fprintf(stderr, "Unknown mac type '%s'\n",
425 optarg);
2c06c99b 426 exit(255);
3c0ef626 427 }
428 break;
c9f39d2c 429 case 'M':
665a873d 430 if (options.control_master == SSHCTL_MASTER_YES)
431 options.control_master = SSHCTL_MASTER_ASK;
432 else
433 options.control_master = SSHCTL_MASTER_YES;
c9f39d2c 434 break;
3c0ef626 435 case 'p':
436 options.port = a2port(optarg);
437 if (options.port == 0) {
438 fprintf(stderr, "Bad port '%s'\n", optarg);
2c06c99b 439 exit(255);
3c0ef626 440 }
441 break;
442 case 'l':
443 options.user = optarg;
444 break;
445
446 case 'L':
996d5e62 447 if (parse_forward(&fwd, optarg))
448 add_local_forward(&options, &fwd);
449 else {
3c0ef626 450 fprintf(stderr,
996d5e62 451 "Bad local forwarding specification '%s'\n",
3c0ef626 452 optarg);
2c06c99b 453 exit(255);
3c0ef626 454 }
996d5e62 455 break;
456
457 case 'R':
458 if (parse_forward(&fwd, optarg)) {
459 add_remote_forward(&options, &fwd);
460 } else {
3c0ef626 461 fprintf(stderr,
996d5e62 462 "Bad remote forwarding specification "
463 "'%s'\n", optarg);
2c06c99b 464 exit(255);
3c0ef626 465 }
3c0ef626 466 break;
467
468 case 'D':
996d5e62 469 cp = p = xstrdup(optarg);
470 memset(&fwd, '\0', sizeof(fwd));
471 fwd.connect_host = "socks";
472 if ((fwd.listen_host = hpdelim(&cp)) == NULL) {
473 fprintf(stderr, "Bad dynamic forwarding "
474 "specification '%.100s'\n", optarg);
2c06c99b 475 exit(255);
996d5e62 476 }
477 if (cp != NULL) {
478 fwd.listen_port = a2port(cp);
479 fwd.listen_host = cleanhostname(fwd.listen_host);
480 } else {
481 fwd.listen_port = a2port(fwd.listen_host);
665a873d 482 fwd.listen_host = NULL;
996d5e62 483 }
484
485 if (fwd.listen_port == 0) {
3c0ef626 486 fprintf(stderr, "Bad dynamic port '%s'\n",
487 optarg);
2c06c99b 488 exit(255);
3c0ef626 489 }
996d5e62 490 add_local_forward(&options, &fwd);
491 xfree(p);
3c0ef626 492 break;
493
494 case 'C':
495 options.compression = 1;
496 break;
497 case 'N':
498 no_shell_flag = 1;
499 no_tty_flag = 1;
500 break;
501 case 'T':
502 no_tty_flag = 1;
503 break;
504 case 'o':
505 dummy = 1;
cdd66111 506 line = xstrdup(optarg);
3c0ef626 507 if (process_config_line(&options, host ? host : "",
cdd66111 508 line, "command-line", 0, &dummy) != 0)
2c06c99b 509 exit(255);
cdd66111 510 xfree(line);
3c0ef626 511 break;
512 case 's':
513 subsystem_flag = 1;
514 break;
c9f39d2c 515 case 'S':
516 if (options.control_path != NULL)
517 free(options.control_path);
518 options.control_path = xstrdup(optarg);
519 break;
3c0ef626 520 case 'b':
521 options.bind_address = optarg;
522 break;
523 case 'F':
524 config = optarg;
525 break;
526 default:
527 usage();
528 }
529 }
530
531 ac -= optind;
532 av += optind;
533
534 if (ac > 0 && !host && **av != '-') {
6a9b3198 535 if (strrchr(*av, '@')) {
3c0ef626 536 p = xstrdup(*av);
6a9b3198 537 cp = strrchr(p, '@');
3c0ef626 538 if (cp == NULL || cp == p)
539 usage();
540 options.user = p;
541 *cp = '\0';
542 host = ++cp;
543 } else
544 host = *av;
6a9b3198 545 if (ac > 1) {
546 optind = optreset = 1;
3c0ef626 547 goto again;
548 }
6a9b3198 549 ac--, av++;
3c0ef626 550 }
551
552 /* Check that we got a host name. */
553 if (!host)
554 usage();
555
556 SSLeay_add_all_algorithms();
557 ERR_load_crypto_strings();
3c0ef626 558
559 /* Initialize the command to execute on remote host. */
560 buffer_init(&command);
561
562 /*
563 * Save the command to execute on the remote host in a buffer. There
564 * is no limit on the length of the command, except by the maximum
565 * packet size. Also sets the tty flag if there is no command.
566 */
567 if (!ac) {
568 /* No command specified - execute shell on a tty. */
569 tty_flag = 1;
570 if (subsystem_flag) {
571 fprintf(stderr,
572 "You must specify a subsystem to invoke.\n");
573 usage();
574 }
575 } else {
576 /* A command has been specified. Store it into the buffer. */
577 for (i = 0; i < ac; i++) {
578 if (i)
579 buffer_append(&command, " ", 1);
580 buffer_append(&command, av[i], strlen(av[i]));
581 }
582 }
583
584 /* Cannot fork to background if no command. */
585 if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag)
586 fatal("Cannot fork into background without a command to execute.");
587
588 /* Allocate a tty by default if no command specified. */
589 if (buffer_len(&command) == 0)
590 tty_flag = 1;
591
41b2f314 592 /* Force no tty */
3c0ef626 593 if (no_tty_flag)
594 tty_flag = 0;
595 /* Do not allocate a tty if stdin is not a tty. */
665a873d 596 if ((!isatty(fileno(stdin)) || stdin_null_flag) && !force_tty_flag) {
3c0ef626 597 if (tty_flag)
0fff78ff 598 logit("Pseudo-terminal will not be allocated because stdin is not a terminal.");
3c0ef626 599 tty_flag = 0;
600 }
601
602 /*
603 * Initialize "log" output. Since we are the client all output
604 * actually goes to stderr.
605 */
606 log_init(av[0], options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level,
607 SYSLOG_FACILITY_USER, 1);
608
609 /*
610 * Read per-user configuration file. Ignore the system wide config
611 * file if the user specifies a config file on the command line.
612 */
613 if (config != NULL) {
c9f39d2c 614 if (!read_config_file(config, host, &options, 0))
3c0ef626 615 fatal("Can't open user config file %.100s: "
616 "%.100s", config, strerror(errno));
799ae497 617 } else {
3c0ef626 618 snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir,
619 _PATH_SSH_USER_CONFFILE);
c9f39d2c 620 (void)read_config_file(buf, host, &options, 1);
3c0ef626 621
622 /* Read systemwide configuration file after use config. */
c9f39d2c 623 (void)read_config_file(_PATH_HOST_CONFIG_FILE, host,
624 &options, 0);
3c0ef626 625 }
626
627 /* Fill configuration defaults. */
628 fill_default_options(&options);
629
0fff78ff 630 channel_set_af(options.address_family);
631
3c0ef626 632 /* reinit */
633 log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 1);
634
635 seed_rng();
636
637 if (options.user == NULL)
638 options.user = xstrdup(pw->pw_name);
639
640 if (options.hostname != NULL)
641 host = options.hostname;
642
0fff78ff 643 /* force lowercase for hostkey matching */
644 if (options.host_key_alias != NULL) {
645 for (p = options.host_key_alias; *p; p++)
646 if (isupper(*p))
9108f8d9 647 *p = (char)tolower(*p);
0fff78ff 648 }
649
665a873d 650 /* Get default port if port has not been set. */
651 if (options.port == 0) {
652 sp = getservbyname(SSH_SERVICE_NAME, "tcp");
653 options.port = sp ? ntohs(sp->s_port) : SSH_DEFAULT_PORT;
654 }
655
6a9b3198 656 if (options.proxy_command != NULL &&
657 strcmp(options.proxy_command, "none") == 0)
658 options.proxy_command = NULL;
665a873d 659 if (options.control_path != NULL &&
660 strcmp(options.control_path, "none") == 0)
661 options.control_path = NULL;
6a9b3198 662
c9f39d2c 663 if (options.control_path != NULL) {
9108f8d9 664 char thishost[NI_MAXHOST];
665
666 if (gethostname(thishost, sizeof(thishost)) == -1)
667 fatal("gethostname: %s", strerror(errno));
665a873d 668 snprintf(buf, sizeof(buf), "%d", options.port);
669 cp = tilde_expand_filename(options.control_path,
670 original_real_uid);
671 options.control_path = percent_expand(cp, "p", buf, "h", host,
9108f8d9 672 "r", options.user, "l", thishost, (char *)NULL);
665a873d 673 xfree(cp);
c9f39d2c 674 }
665a873d 675 if (mux_command != 0 && options.control_path == NULL)
676 fatal("No ControlPath specified for \"-O\" command");
677 if (options.control_path != NULL)
678 control_client(options.control_path);
c9f39d2c 679
3c0ef626 680 /* Open a connection to the remote host. */
0fff78ff 681 if (ssh_connect(host, &hostaddr, options.port,
682 options.address_family, options.connection_attempts,
f5799ae1 683#ifdef HAVE_CYGWIN
684 options.use_privileged_port,
685#else
686 original_effective_uid == 0 && options.use_privileged_port,
687#endif
688 options.proxy_command) != 0)
2c06c99b 689 exit(255);
3c0ef626 690
691 /*
692 * If we successfully made the connection, load the host private key
693 * in case we will need it later for combined rsa-rhosts
694 * authentication. This must be done before releasing extra
695 * privileges, because the file is only readable by root.
f5799ae1 696 * If we cannot access the private keys, load the public keys
697 * instead and try to execute the ssh-keysign helper instead.
3c0ef626 698 */
699 sensitive_data.nkeys = 0;
700 sensitive_data.keys = NULL;
f5799ae1 701 sensitive_data.external_keysign = 0;
702 if (options.rhosts_rsa_authentication ||
703 options.hostbased_authentication) {
3c0ef626 704 sensitive_data.nkeys = 3;
9108f8d9 705 sensitive_data.keys = xcalloc(sensitive_data.nkeys,
41b2f314 706 sizeof(Key));
f5799ae1 707
708 PRIV_START;
3c0ef626 709 sensitive_data.keys[0] = key_load_private_type(KEY_RSA1,
9108f8d9 710 _PATH_HOST_KEY_FILE, "", NULL, NULL);
3c0ef626 711 sensitive_data.keys[1] = key_load_private_type(KEY_DSA,
9108f8d9 712 _PATH_HOST_DSA_KEY_FILE, "", NULL, NULL);
3c0ef626 713 sensitive_data.keys[2] = key_load_private_type(KEY_RSA,
9108f8d9 714 _PATH_HOST_RSA_KEY_FILE, "", NULL, NULL);
f5799ae1 715 PRIV_END;
716
41b2f314 717 if (options.hostbased_authentication == 1 &&
718 sensitive_data.keys[0] == NULL &&
f5799ae1 719 sensitive_data.keys[1] == NULL &&
720 sensitive_data.keys[2] == NULL) {
721 sensitive_data.keys[1] = key_load_public(
722 _PATH_HOST_DSA_KEY_FILE, NULL);
723 sensitive_data.keys[2] = key_load_public(
724 _PATH_HOST_RSA_KEY_FILE, NULL);
725 sensitive_data.external_keysign = 1;
726 }
3c0ef626 727 }
728 /*
729 * Get rid of any extra privileges that we may have. We will no
730 * longer need them. Also, extra privileges could make it very hard
731 * to read identity files and other non-world-readable files from the
732 * user's home directory if it happens to be on a NFS volume where
733 * root is mapped to nobody.
734 */
c9f39d2c 735 if (original_effective_uid == 0) {
736 PRIV_START;
737 permanently_set_uid(pw);
738 }
3c0ef626 739
740 /*
741 * Now that we are back to our own permissions, create ~/.ssh
2c06c99b 742 * directory if it doesn't already exist.
3c0ef626 743 */
744 snprintf(buf, sizeof buf, "%.100s%s%.100s", pw->pw_dir, strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR);
745 if (stat(buf, &st) < 0)
746 if (mkdir(buf, 0700) < 0)
747 error("Could not create directory '%.200s'.", buf);
748
3c0ef626 749 /* load options.identity_files */
750 load_public_identity_files();
751
752 /* Expand ~ in known host file names. */
753 /* XXX mem-leaks: */
754 options.system_hostfile =
755 tilde_expand_filename(options.system_hostfile, original_real_uid);
756 options.user_hostfile =
757 tilde_expand_filename(options.user_hostfile, original_real_uid);
758 options.system_hostfile2 =
759 tilde_expand_filename(options.system_hostfile2, original_real_uid);
760 options.user_hostfile2 =
761 tilde_expand_filename(options.user_hostfile2, original_real_uid);
762
763 signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
764
765 /* Log into the remote system. This never returns if the login fails. */
f5799ae1 766 ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr, pw);
3c0ef626 767
768 /* We no longer need the private host keys. Clear them now. */
769 if (sensitive_data.nkeys != 0) {
770 for (i = 0; i < sensitive_data.nkeys; i++) {
771 if (sensitive_data.keys[i] != NULL) {
772 /* Destroys contents safely */
773 debug3("clear hostkey %d", i);
774 key_free(sensitive_data.keys[i]);
775 sensitive_data.keys[i] = NULL;
776 }
777 }
778 xfree(sensitive_data.keys);
779 }
780 for (i = 0; i < options.num_identity_files; i++) {
781 if (options.identity_files[i]) {
782 xfree(options.identity_files[i]);
783 options.identity_files[i] = NULL;
784 }
785 if (options.identity_keys[i]) {
786 key_free(options.identity_keys[i]);
787 options.identity_keys[i] = NULL;
788 }
789 }
790
791 exit_status = compat20 ? ssh_session2() : ssh_session();
792 packet_close();
41b2f314 793
c9f39d2c 794 if (options.control_path != NULL && control_fd != -1)
795 unlink(options.control_path);
796
41b2f314 797 /*
cdd66111 798 * Send SIGHUP to proxy command if used. We don't wait() in
41b2f314 799 * case it hangs and instead rely on init to reap the child
800 */
801 if (proxy_command_pid > 1)
802 kill(proxy_command_pid, SIGHUP);
803
3c0ef626 804 return exit_status;
805}
806
3c0ef626 807static void
808ssh_init_forwarding(void)
809{
810 int success = 0;
811 int i;
812
813 /* Initiate local TCP/IP port forwardings. */
814 for (i = 0; i < options.num_local_forwards; i++) {
996d5e62 815 debug("Local connections to %.200s:%d forwarded to remote "
816 "address %.200s:%d",
dec6d9fe 817 (options.local_forwards[i].listen_host == NULL) ?
818 (options.gateway_ports ? "*" : "LOCALHOST") :
996d5e62 819 options.local_forwards[i].listen_host,
820 options.local_forwards[i].listen_port,
821 options.local_forwards[i].connect_host,
822 options.local_forwards[i].connect_port);
e9a17296 823 success += channel_setup_local_fwd_listener(
996d5e62 824 options.local_forwards[i].listen_host,
825 options.local_forwards[i].listen_port,
826 options.local_forwards[i].connect_host,
827 options.local_forwards[i].connect_port,
3c0ef626 828 options.gateway_ports);
829 }
9108f8d9 830 if (i > 0 && success != i && options.exit_on_forward_failure)
831 fatal("Could not request local forwarding.");
3c0ef626 832 if (i > 0 && success == 0)
833 error("Could not request local forwarding.");
834
835 /* Initiate remote TCP/IP port forwardings. */
836 for (i = 0; i < options.num_remote_forwards; i++) {
996d5e62 837 debug("Remote connections from %.200s:%d forwarded to "
838 "local address %.200s:%d",
665a873d 839 (options.remote_forwards[i].listen_host == NULL) ?
2c06c99b 840 "LOCALHOST" : options.remote_forwards[i].listen_host,
996d5e62 841 options.remote_forwards[i].listen_port,
842 options.remote_forwards[i].connect_host,
843 options.remote_forwards[i].connect_port);
9108f8d9 844 if (channel_request_remote_forwarding(
996d5e62 845 options.remote_forwards[i].listen_host,
846 options.remote_forwards[i].listen_port,
847 options.remote_forwards[i].connect_host,
9108f8d9 848 options.remote_forwards[i].connect_port) < 0) {
849 if (options.exit_on_forward_failure)
850 fatal("Could not request remote forwarding.");
851 else
852 logit("Warning: Could not request remote "
853 "forwarding.");
854 }
3c0ef626 855 }
856}
857
858static void
859check_agent_present(void)
860{
861 if (options.forward_agent) {
2c06c99b 862 /* Clear agent forwarding if we don't have an agent. */
41b2f314 863 if (!ssh_agent_present())
3c0ef626 864 options.forward_agent = 0;
3c0ef626 865 }
866}
867
868static int
869ssh_session(void)
870{
871 int type;
3c0ef626 872 int interactive = 0;
873 int have_tty = 0;
874 struct winsize ws;
875 char *cp;
665a873d 876 const char *display;
3c0ef626 877
878 /* Enable compression if requested. */
879 if (options.compression) {
880 debug("Requesting compression at level %d.", options.compression_level);
881
882 if (options.compression_level < 1 || options.compression_level > 9)
883 fatal("Compression level must be from 1 (fast) to 9 (slow, best).");
884
885 /* Send the request. */
886 packet_start(SSH_CMSG_REQUEST_COMPRESSION);
887 packet_put_int(options.compression_level);
888 packet_send();
889 packet_write_wait();
e9a17296 890 type = packet_read();
3c0ef626 891 if (type == SSH_SMSG_SUCCESS)
892 packet_start_compression(options.compression_level);
893 else if (type == SSH_SMSG_FAILURE)
0fff78ff 894 logit("Warning: Remote host refused compression.");
3c0ef626 895 else
896 packet_disconnect("Protocol error waiting for compression response.");
897 }
898 /* Allocate a pseudo tty if appropriate. */
899 if (tty_flag) {
900 debug("Requesting pty.");
901
902 /* Start the packet. */
903 packet_start(SSH_CMSG_REQUEST_PTY);
904
905 /* Store TERM in the packet. There is no limit on the
906 length of the string. */
907 cp = getenv("TERM");
908 if (!cp)
909 cp = "";
910 packet_put_cstring(cp);
911
912 /* Store window size in the packet. */
913 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
914 memset(&ws, 0, sizeof(ws));
9108f8d9 915 packet_put_int((u_int)ws.ws_row);
916 packet_put_int((u_int)ws.ws_col);
917 packet_put_int((u_int)ws.ws_xpixel);
918 packet_put_int((u_int)ws.ws_ypixel);
3c0ef626 919
920 /* Store tty modes in the packet. */
921 tty_make_modes(fileno(stdin), NULL);
922
923 /* Send the packet, and wait for it to leave. */
924 packet_send();
925 packet_write_wait();
926
927 /* Read response from the server. */
e9a17296 928 type = packet_read();
3c0ef626 929 if (type == SSH_SMSG_SUCCESS) {
930 interactive = 1;
931 have_tty = 1;
932 } else if (type == SSH_SMSG_FAILURE)
0fff78ff 933 logit("Warning: Remote host failed or refused to allocate a pseudo tty.");
3c0ef626 934 else
935 packet_disconnect("Protocol error waiting for pty request response.");
936 }
937 /* Request X11 forwarding if enabled and DISPLAY is set. */
665a873d 938 display = getenv("DISPLAY");
939 if (options.forward_x11 && display != NULL) {
e9a17296 940 char *proto, *data;
3c0ef626 941 /* Get reasonable local authentication information. */
665a873d 942 client_x11_get_proto(display, options.xauth_location,
943 options.forward_x11_trusted, &proto, &data);
3c0ef626 944 /* Request forwarding with authentication spoofing. */
945 debug("Requesting X11 forwarding with authentication spoofing.");
665a873d 946 x11_request_forwarding_with_spoofing(0, display, proto, data);
3c0ef626 947
948 /* Read response from the server. */
e9a17296 949 type = packet_read();
3c0ef626 950 if (type == SSH_SMSG_SUCCESS) {
951 interactive = 1;
952 } else if (type == SSH_SMSG_FAILURE) {
0fff78ff 953 logit("Warning: Remote host denied X11 forwarding.");
3c0ef626 954 } else {
955 packet_disconnect("Protocol error waiting for X11 forwarding");
956 }
957 }
958 /* Tell the packet module whether this is an interactive session. */
959 packet_set_interactive(interactive);
960
961 /* Request authentication agent forwarding if appropriate. */
962 check_agent_present();
963
964 if (options.forward_agent) {
965 debug("Requesting authentication agent forwarding.");
966 auth_request_forwarding();
967
968 /* Read response from the server. */
e9a17296 969 type = packet_read();
970 packet_check_eom();
3c0ef626 971 if (type != SSH_SMSG_SUCCESS)
0fff78ff 972 logit("Warning: Remote host denied authentication agent forwarding.");
3c0ef626 973 }
974
975 /* Initiate port forwardings. */
976 ssh_init_forwarding();
977
978 /* If requested, let ssh continue in the background. */
979 if (fork_after_authentication_flag)
980 if (daemon(1, 1) < 0)
981 fatal("daemon() failed: %.200s", strerror(errno));
982
983 /*
984 * If a command was specified on the command line, execute the
985 * command now. Otherwise request the server to start a shell.
986 */
987 if (buffer_len(&command) > 0) {
988 int len = buffer_len(&command);
989 if (len > 900)
990 len = 900;
e9a17296 991 debug("Sending command: %.*s", len, (u_char *)buffer_ptr(&command));
3c0ef626 992 packet_start(SSH_CMSG_EXEC_CMD);
993 packet_put_string(buffer_ptr(&command), buffer_len(&command));
994 packet_send();
995 packet_write_wait();
996 } else {
997 debug("Requesting shell.");
998 packet_start(SSH_CMSG_EXEC_SHELL);
999 packet_send();
1000 packet_write_wait();
1001 }
1002
1003 /* Enter the interactive session. */
1004 return client_loop(have_tty, tty_flag ?
1005 options.escape_char : SSH_ESCAPECHAR_NONE, 0);
1006}
1007
1008static void
c9f39d2c 1009ssh_subsystem_reply(int type, u_int32_t seq, void *ctxt)
3c0ef626 1010{
1011 int id, len;
1012
1013 id = packet_get_int();
1014 len = buffer_len(&command);
1015 if (len > 900)
1016 len = 900;
e9a17296 1017 packet_check_eom();
3c0ef626 1018 if (type == SSH2_MSG_CHANNEL_FAILURE)
1019 fatal("Request for subsystem '%.*s' failed on channel %d",
e9a17296 1020 len, (u_char *)buffer_ptr(&command), id);
3c0ef626 1021}
1022
700318f3 1023void
cdd66111 1024client_global_request_reply_fwd(int type, u_int32_t seq, void *ctxt)
700318f3 1025{
1026 int i;
1027
1028 i = client_global_request_id++;
cdd66111 1029 if (i >= options.num_remote_forwards)
700318f3 1030 return;
700318f3 1031 debug("remote forward %s for: listen %d, connect %s:%d",
1032 type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
996d5e62 1033 options.remote_forwards[i].listen_port,
1034 options.remote_forwards[i].connect_host,
1035 options.remote_forwards[i].connect_port);
9108f8d9 1036 if (type == SSH2_MSG_REQUEST_FAILURE) {
1037 if (options.exit_on_forward_failure)
1038 fatal("Error: remote port forwarding failed for "
1039 "listen port %d",
1040 options.remote_forwards[i].listen_port);
1041 else
1042 logit("Warning: remote port forwarding failed for "
1043 "listen port %d",
1044 options.remote_forwards[i].listen_port);
1045 }
700318f3 1046}
1047
3c0ef626 1048static void
c9f39d2c 1049ssh_control_listener(void)
3c0ef626 1050{
c9f39d2c 1051 struct sockaddr_un addr;
1052 mode_t old_umask;
1053 int addr_len;
3c0ef626 1054
665a873d 1055 if (options.control_path == NULL ||
1056 options.control_master == SSHCTL_MASTER_NO)
c9f39d2c 1057 return;
3c0ef626 1058
665a873d 1059 debug("setting up multiplex master socket");
1060
c9f39d2c 1061 memset(&addr, '\0', sizeof(addr));
1062 addr.sun_family = AF_UNIX;
1063 addr_len = offsetof(struct sockaddr_un, sun_path) +
1064 strlen(options.control_path) + 1;
3c0ef626 1065
c9f39d2c 1066 if (strlcpy(addr.sun_path, options.control_path,
1067 sizeof(addr.sun_path)) >= sizeof(addr.sun_path))
1068 fatal("ControlPath too long");
1069
1070 if ((control_fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0)
2c06c99b 1071 fatal("%s socket(): %s", __func__, strerror(errno));
c9f39d2c 1072
1073 old_umask = umask(0177);
9108f8d9 1074 if (bind(control_fd, (struct sockaddr *)&addr, addr_len) == -1) {
c9f39d2c 1075 control_fd = -1;
dec6d9fe 1076 if (errno == EINVAL || errno == EADDRINUSE)
c9f39d2c 1077 fatal("ControlSocket %s already exists",
1078 options.control_path);
1079 else
2c06c99b 1080 fatal("%s bind(): %s", __func__, strerror(errno));
3c0ef626 1081 }
c9f39d2c 1082 umask(old_umask);
1083
1084 if (listen(control_fd, 64) == -1)
2c06c99b 1085 fatal("%s listen(): %s", __func__, strerror(errno));
c9f39d2c 1086
1087 set_nonblock(control_fd);
1088}
1089
1090/* request pty/x11/agent/tcpfwd/shell for channel */
1091static void
1092ssh_session2_setup(int id, void *arg)
1093{
1094 extern char **environ;
665a873d 1095 const char *display;
c9f39d2c 1096 int interactive = tty_flag;
665a873d 1097
1098 display = getenv("DISPLAY");
1099 if (options.forward_x11 && display != NULL) {
e9a17296 1100 char *proto, *data;
3c0ef626 1101 /* Get reasonable local authentication information. */
665a873d 1102 client_x11_get_proto(display, options.xauth_location,
1103 options.forward_x11_trusted, &proto, &data);
3c0ef626 1104 /* Request forwarding with authentication spoofing. */
1105 debug("Requesting X11 forwarding with authentication spoofing.");
665a873d 1106 x11_request_forwarding_with_spoofing(id, display, proto, data);
3c0ef626 1107 interactive = 1;
1108 /* XXX wait for reply */
1109 }
1110
1111 check_agent_present();
1112 if (options.forward_agent) {
1113 debug("Requesting authentication agent forwarding.");
1114 channel_request_start(id, "auth-agent-req@openssh.com", 0);
1115 packet_send();
1116 }
1117
2c06c99b 1118 if (options.tun_open != SSH_TUNMODE_NO) {
1119 Channel *c;
1120 int fd;
1121
1122 debug("Requesting tun.");
1123 if ((fd = tun_open(options.tun_local,
1124 options.tun_open)) >= 0) {
1125 c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1,
1126 CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT,
1127 0, "tun", 1);
1128 c->datagram = 1;
1129#if defined(SSH_TUN_FILTER)
1130 if (options.tun_open == SSH_TUNMODE_POINTOPOINT)
1131 channel_register_filter(c->self, sys_tun_infilter,
1132 sys_tun_outfilter);
1133#endif
1134 packet_start(SSH2_MSG_CHANNEL_OPEN);
1135 packet_put_cstring("tun@openssh.com");
1136 packet_put_int(c->self);
1137 packet_put_int(c->local_window_max);
1138 packet_put_int(c->local_maxpacket);
1139 packet_put_int(options.tun_open);
1140 packet_put_int(options.tun_remote);
1141 packet_send();
1142 }
1143 }
1144
c9f39d2c 1145 client_session2_setup(id, tty_flag, subsystem_flag, getenv("TERM"),
1146 NULL, fileno(stdin), &command, environ, &ssh_subsystem_reply);
3c0ef626 1147
3c0ef626 1148 packet_set_interactive(interactive);
1149}
1150
1151/* open new channel for a session */
1152static int
1153ssh_session2_open(void)
1154{
1155 Channel *c;
1156 int window, packetmax, in, out, err;
1157
1158 if (stdin_null_flag) {
1159 in = open(_PATH_DEVNULL, O_RDONLY);
1160 } else {
1161 in = dup(STDIN_FILENO);
1162 }
1163 out = dup(STDOUT_FILENO);
1164 err = dup(STDERR_FILENO);
1165
1166 if (in < 0 || out < 0 || err < 0)
1167 fatal("dup() in/out/err failed");
1168
1169 /* enable nonblocking unless tty */
1170 if (!isatty(in))
1171 set_nonblock(in);
1172 if (!isatty(out))
1173 set_nonblock(out);
1174 if (!isatty(err))
1175 set_nonblock(err);
1176
1177 window = CHAN_SES_WINDOW_DEFAULT;
1178 packetmax = CHAN_SES_PACKET_DEFAULT;
e9a17296 1179 if (tty_flag) {
1180 window >>= 1;
1181 packetmax >>= 1;
3c0ef626 1182 }
1183 c = channel_new(
1184 "session", SSH_CHANNEL_OPENING, in, out, err,
1185 window, packetmax, CHAN_EXTENDED_WRITE,
0fff78ff 1186 "client-session", /*nonblock*/0);
3c0ef626 1187
1188 debug3("ssh_session2_open: channel_new: %d", c->self);
1189
1190 channel_send_open(c->self);
1191 if (!no_shell_flag)
c9f39d2c 1192 channel_register_confirm(c->self, ssh_session2_setup, NULL);
3c0ef626 1193
1194 return c->self;
1195}
1196
1197static int
1198ssh_session2(void)
1199{
1200 int id = -1;
1201
1202 /* XXX should be pre-session */
1203 ssh_init_forwarding();
c9f39d2c 1204 ssh_control_listener();
3c0ef626 1205
1206 if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN))
1207 id = ssh_session2_open();
1208
2c06c99b 1209 /* Execute a local command */
1210 if (options.local_command != NULL &&
1211 options.permit_local_command)
1212 ssh_local_cmd(options.local_command);
1213
3c0ef626 1214 /* If requested, let ssh continue in the background. */
1215 if (fork_after_authentication_flag)
1216 if (daemon(1, 1) < 0)
1217 fatal("daemon() failed: %.200s", strerror(errno));
1218
1219 return client_loop(tty_flag, tty_flag ?
1220 options.escape_char : SSH_ESCAPECHAR_NONE, id);
1221}
1222
1223static void
1224load_public_identity_files(void)
1225{
9108f8d9 1226 char *filename, *cp, thishost[NI_MAXHOST];
3c0ef626 1227 int i = 0;
700318f3 1228 Key *public;
9108f8d9 1229 struct passwd *pw;
3c0ef626 1230#ifdef SMARTCARD
700318f3 1231 Key **keys;
1232
3c0ef626 1233 if (options.smartcard_device != NULL &&
700318f3 1234 options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
9108f8d9 1235 (keys = sc_get_keys(options.smartcard_device, NULL)) != NULL) {
700318f3 1236 int count = 0;
1237 for (i = 0; keys[i] != NULL; i++) {
1238 count++;
1239 memmove(&options.identity_files[1], &options.identity_files[0],
1240 sizeof(char *) * (SSH_MAX_IDENTITY_FILES - 1));
1241 memmove(&options.identity_keys[1], &options.identity_keys[0],
1242 sizeof(Key *) * (SSH_MAX_IDENTITY_FILES - 1));
1243 options.num_identity_files++;
1244 options.identity_keys[0] = keys[i];
0fff78ff 1245 options.identity_files[0] = sc_get_key_label(keys[i]);
700318f3 1246 }
1247 if (options.num_identity_files > SSH_MAX_IDENTITY_FILES)
1248 options.num_identity_files = SSH_MAX_IDENTITY_FILES;
1249 i = count;
1250 xfree(keys);
3c0ef626 1251 }
1252#endif /* SMARTCARD */
9108f8d9 1253 if ((pw = getpwuid(original_real_uid)) == NULL)
1254 fatal("load_public_identity_files: getpwuid failed");
1255 if (gethostname(thishost, sizeof(thishost)) == -1)
1256 fatal("load_public_identity_files: gethostname: %s",
1257 strerror(errno));
3c0ef626 1258 for (; i < options.num_identity_files; i++) {
9108f8d9 1259 cp = tilde_expand_filename(options.identity_files[i],
3c0ef626 1260 original_real_uid);
9108f8d9 1261 filename = percent_expand(cp, "d", pw->pw_dir,
1262 "u", pw->pw_name, "l", thishost, "h", host,
1263 "r", options.user, (char *)NULL);
1264 xfree(cp);
3c0ef626 1265 public = key_load_public(filename, NULL);
1266 debug("identity file %s type %d", filename,
1267 public ? public->type : -1);
1268 xfree(options.identity_files[i]);
1269 options.identity_files[i] = filename;
1270 options.identity_keys[i] = public;
1271 }
1272}
c9f39d2c 1273
1274static void
1275control_client_sighandler(int signo)
1276{
1277 control_client_terminate = signo;
1278}
1279
1280static void
1281control_client_sigrelay(int signo)
1282{
1283 if (control_server_pid > 1)
1284 kill(control_server_pid, signo);
1285}
1286
1287static int
1288env_permitted(char *env)
1289{
9108f8d9 1290 int i, ret;
c9f39d2c 1291 char name[1024], *cp;
1292
9108f8d9 1293 if ((cp = strchr(env, '=')) == NULL || cp == env)
c9f39d2c 1294 return (0);
9108f8d9 1295 ret = snprintf(name, sizeof(name), "%.*s", (int)(cp - env), env);
1296 if (ret <= 0 || (size_t)ret >= sizeof(name))
1297 fatal("env_permitted: name '%.100s...' too long", env);
c9f39d2c 1298
1299 for (i = 0; i < options.num_send_env; i++)
1300 if (match_pattern(name, options.send_env[i]))
1301 return (1);
1302
1303 return (0);
1304}
1305
1306static void
1307control_client(const char *path)
1308{
1309 struct sockaddr_un addr;
996d5e62 1310 int i, r, fd, sock, exitval, num_env, addr_len;
c9f39d2c 1311 Buffer m;
996d5e62 1312 char *term;
c9f39d2c 1313 extern char **environ;
996d5e62 1314 u_int flags;
1315
665a873d 1316 if (mux_command == 0)
1317 mux_command = SSHMUX_COMMAND_OPEN;
1318
1319 switch (options.control_master) {
1320 case SSHCTL_MASTER_AUTO:
1321 case SSHCTL_MASTER_AUTO_ASK:
1322 debug("auto-mux: Trying existing master");
1323 /* FALLTHROUGH */
1324 case SSHCTL_MASTER_NO:
1325 break;
1326 default:
1327 return;
996d5e62 1328 }
c9f39d2c 1329
1330 memset(&addr, '\0', sizeof(addr));
1331 addr.sun_family = AF_UNIX;
1332 addr_len = offsetof(struct sockaddr_un, sun_path) +
1333 strlen(path) + 1;
1334
1335 if (strlcpy(addr.sun_path, path,
1336 sizeof(addr.sun_path)) >= sizeof(addr.sun_path))
1337 fatal("ControlPath too long");
1338
1339 if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) < 0)
1340 fatal("%s socket(): %s", __func__, strerror(errno));
1341
9108f8d9 1342 if (connect(sock, (struct sockaddr *)&addr, addr_len) == -1) {
665a873d 1343 if (mux_command != SSHMUX_COMMAND_OPEN) {
1344 fatal("Control socket connect(%.100s): %s", path,
1345 strerror(errno));
1346 }
1347 if (errno == ENOENT)
9108f8d9 1348 debug("Control socket \"%.100s\" does not exist", path);
665a873d 1349 else {
9108f8d9 1350 error("Control socket connect(%.100s): %s", path,
665a873d 1351 strerror(errno));
1352 }
9108f8d9 1353 close(sock);
1354 return;
1355 }
1356
1357 if (stdin_null_flag) {
1358 if ((fd = open(_PATH_DEVNULL, O_RDONLY)) == -1)
1359 fatal("open(/dev/null): %s", strerror(errno));
1360 if (dup2(fd, STDIN_FILENO) == -1)
1361 fatal("dup2: %s", strerror(errno));
1362 if (fd > STDERR_FILENO)
1363 close(fd);
1364 }
c9f39d2c 1365
665a873d 1366 term = getenv("TERM");
996d5e62 1367
1368 flags = 0;
1369 if (tty_flag)
1370 flags |= SSHMUX_FLAG_TTY;
1371 if (subsystem_flag)
1372 flags |= SSHMUX_FLAG_SUBSYS;
665a873d 1373 if (options.forward_x11)
1374 flags |= SSHMUX_FLAG_X11_FWD;
1375 if (options.forward_agent)
1376 flags |= SSHMUX_FLAG_AGENT_FWD;
c9f39d2c 1377
1378 buffer_init(&m);
1379
996d5e62 1380 /* Send our command to server */
1381 buffer_put_int(&m, mux_command);
1382 buffer_put_int(&m, flags);
665a873d 1383 if (ssh_msg_send(sock, SSHMUX_VER, &m) == -1)
996d5e62 1384 fatal("%s: msg_send", __func__);
1385 buffer_clear(&m);
1386
1387 /* Get authorisation status and PID of controlee */
c9f39d2c 1388 if (ssh_msg_recv(sock, &m) == -1)
1389 fatal("%s: msg_recv", __func__);
665a873d 1390 if (buffer_get_char(&m) != SSHMUX_VER)
c9f39d2c 1391 fatal("%s: wrong version", __func__);
c9f39d2c 1392 if (buffer_get_int(&m) != 1)
1393 fatal("Connection to master denied");
1394 control_server_pid = buffer_get_int(&m);
1395
1396 buffer_clear(&m);
c9f39d2c 1397
996d5e62 1398 switch (mux_command) {
1399 case SSHMUX_COMMAND_ALIVE_CHECK:
dec6d9fe 1400 fprintf(stderr, "Master running (pid=%d)\r\n",
996d5e62 1401 control_server_pid);
1402 exit(0);
1403 case SSHMUX_COMMAND_TERMINATE:
1404 fprintf(stderr, "Exit request sent.\r\n");
1405 exit(0);
1406 case SSHMUX_COMMAND_OPEN:
1407 /* continue below */
1408 break;
1409 default:
1410 fatal("silly mux_command %d", mux_command);
1411 }
1412
1413 /* SSHMUX_COMMAND_OPEN */
665a873d 1414 buffer_put_cstring(&m, term ? term : "");
c9f39d2c 1415 buffer_append(&command, "\0", 1);
1416 buffer_put_cstring(&m, buffer_ptr(&command));
1417
1418 if (options.num_send_env == 0 || environ == NULL) {
1419 buffer_put_int(&m, 0);
1420 } else {
1421 /* Pass environment */
1422 num_env = 0;
1423 for (i = 0; environ[i] != NULL; i++)
1424 if (env_permitted(environ[i]))
1425 num_env++; /* Count */
1426
1427 buffer_put_int(&m, num_env);
1428
1429 for (i = 0; environ[i] != NULL && num_env >= 0; i++)
1430 if (env_permitted(environ[i])) {
1431 num_env--;
1432 buffer_put_cstring(&m, environ[i]);
1433 }
1434 }
1435
665a873d 1436 if (ssh_msg_send(sock, SSHMUX_VER, &m) == -1)
c9f39d2c 1437 fatal("%s: msg_send", __func__);
1438
1439 mm_send_fd(sock, STDIN_FILENO);
1440 mm_send_fd(sock, STDOUT_FILENO);
1441 mm_send_fd(sock, STDERR_FILENO);
1442
1443 /* Wait for reply, so master has a chance to gather ttymodes */
1444 buffer_clear(&m);
1445 if (ssh_msg_recv(sock, &m) == -1)
1446 fatal("%s: msg_recv", __func__);
665a873d 1447 if (buffer_get_char(&m) != SSHMUX_VER)
996d5e62 1448 fatal("%s: wrong version", __func__);
c9f39d2c 1449 buffer_free(&m);
1450
996d5e62 1451 signal(SIGHUP, control_client_sighandler);
c9f39d2c 1452 signal(SIGINT, control_client_sighandler);
1453 signal(SIGTERM, control_client_sighandler);
1454 signal(SIGWINCH, control_client_sigrelay);
1455
1456 if (tty_flag)
1457 enter_raw_mode();
1458
1459 /* Stick around until the controlee closes the client_fd */
1460 exitval = 0;
1461 for (;!control_client_terminate;) {
1462 r = read(sock, &exitval, sizeof(exitval));
1463 if (r == 0) {
1464 debug2("Received EOF from master");
1465 break;
1466 }
1467 if (r > 0)
1468 debug2("Received exit status from master %d", exitval);
1469 if (r == -1 && errno != EINTR)
1470 fatal("%s: read %s", __func__, strerror(errno));
1471 }
1472
1473 if (control_client_terminate)
1474 debug2("Exiting on signal %d", control_client_terminate);
1475
1476 close(sock);
1477
1478 leave_raw_mode();
1479
1480 if (tty_flag && options.log_level != SYSLOG_LEVEL_QUIET)
1481 fprintf(stderr, "Connection to master closed.\r\n");
1482
1483 exit(exitval);
1484}
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