Annotation of src/usr.bin/ssh/ssh.c, Revision 1.257
1.1 deraadt 1: /*
1.32 deraadt 2: * Author: Tatu Ylonen <ylo@cs.hut.fi>
3: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
4: * All rights reserved
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: *
1.64 deraadt 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.
1.202 markus 16: * Copyright (c) 2000, 2001, 2002, 2003 Markus Friedl. All rights reserved.
1.64 deraadt 17: *
18: * Modified to work with SSL by Niels Provos <provos@citi.umich.edu>
19: * in Canada (German citizen).
20: *
21: * Redistribution and use in source and binary forms, with or without
22: * modification, are permitted provided that the following conditions
23: * are met:
24: * 1. Redistributions of source code must retain the above copyright
25: * notice, this list of conditions and the following disclaimer.
26: * 2. Redistributions in binary form must reproduce the above copyright
27: * notice, this list of conditions and the following disclaimer in the
28: * documentation and/or other materials provided with the distribution.
29: *
30: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
31: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
32: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
33: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
34: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
35: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
36: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
37: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
38: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
39: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.32 deraadt 40: */
1.1 deraadt 41:
42: #include "includes.h"
1.257 ! dtucker 43: RCSID("$OpenBSD: ssh.c,v 1.256 2005/12/08 18:34:11 reyk Exp $");
1.49 markus 44:
45: #include <openssl/evp.h>
1.72 markus 46: #include <openssl/err.h>
1.1 deraadt 47:
1.84 markus 48: #include "ssh.h"
49: #include "ssh1.h"
50: #include "ssh2.h"
51: #include "compat.h"
52: #include "cipher.h"
1.1 deraadt 53: #include "xmalloc.h"
54: #include "packet.h"
55: #include "buffer.h"
1.214 djm 56: #include "bufaux.h"
1.123 markus 57: #include "channels.h"
1.49 markus 58: #include "key.h"
1.58 markus 59: #include "authfd.h"
1.49 markus 60: #include "authfile.h"
1.83 markus 61: #include "pathnames.h"
1.214 djm 62: #include "dispatch.h"
1.81 markus 63: #include "clientloop.h"
1.84 markus 64: #include "log.h"
65: #include "readconf.h"
66: #include "sshconnect.h"
67: #include "misc.h"
1.95 markus 68: #include "kex.h"
69: #include "mac.h"
1.213 deraadt 70: #include "sshpty.h"
1.212 djm 71: #include "match.h"
1.214 djm 72: #include "msg.h"
73: #include "monitor_fdpass.h"
1.225 dtucker 74: #include "uidswap.h"
1.49 markus 75:
1.127 markus 76: #ifdef SMARTCARD
77: #include "scard.h"
1.137 jakob 78: #endif
1.127 markus 79:
1.49 markus 80: extern char *__progname;
1.1 deraadt 81:
1.31 markus 82: /* Flag indicating whether debug mode is on. This can be set on the command line. */
1.1 deraadt 83: int debug_flag = 0;
84:
1.46 markus 85: /* Flag indicating whether a tty should be allocated */
1.1 deraadt 86: int tty_flag = 0;
1.79 markus 87: int no_tty_flag = 0;
88: int force_tty_flag = 0;
1.1 deraadt 89:
1.45 markus 90: /* don't exec a shell */
91: int no_shell_flag = 0;
92:
1.33 markus 93: /*
94: * Flag indicating that nothing should be read from stdin. This can be set
95: * on the command line.
96: */
1.1 deraadt 97: int stdin_null_flag = 0;
98:
1.33 markus 99: /*
100: * Flag indicating that ssh should fork after authentication. This is useful
1.172 deraadt 101: * so that the passphrase can be entered manually, and then ssh goes to the
1.33 markus 102: * background.
103: */
1.1 deraadt 104: int fork_after_authentication_flag = 0;
105:
1.33 markus 106: /*
107: * General data structure for command line options and options configurable
108: * in configuration files. See readconf.h.
109: */
1.1 deraadt 110: Options options;
111:
1.139 markus 112: /* optional user configfile */
113: char *config = NULL;
114:
1.33 markus 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: */
1.1 deraadt 120: char *host;
121:
1.22 provos 122: /* socket address the host resolves to */
1.37 markus 123: struct sockaddr_storage hostaddr;
1.1 deraadt 124:
1.112 markus 125: /* Private host keys. */
1.173 markus 126: Sensitive sensitive_data;
1.1 deraadt 127:
1.10 dugsong 128: /* Original real UID. */
129: uid_t original_real_uid;
1.177 markus 130: uid_t original_effective_uid;
1.1 deraadt 131:
1.45 markus 132: /* command to be executed */
133: Buffer command;
134:
1.85 djm 135: /* Should we execute a command or invoke a subsystem? */
136: int subsystem_flag = 0;
137:
1.170 markus 138: /* # of replies received for global requests */
139: static int client_global_request_id = 0;
140:
1.186 djm 141: /* pid of proxycommand child process */
142: pid_t proxy_command_pid = 0;
143:
1.214 djm 144: /* fd to control socket */
145: int control_fd = -1;
146:
1.229 djm 147: /* Multiplexing control command */
1.240 djm 148: static u_int mux_command = 0;
1.229 djm 149:
1.214 djm 150: /* Only used in control client mode */
151: volatile sig_atomic_t control_client_terminate = 0;
152: u_int control_server_pid = 0;
153:
1.1 deraadt 154: /* Prints a help message to the user. This function never returns. */
155:
1.126 itojun 156: static void
1.93 itojun 157: usage(void)
1.1 deraadt 158: {
1.208 markus 159: fprintf(stderr,
1.230 jmc 160: "usage: ssh [-1246AaCfgkMNnqsTtVvXxY] [-b bind_address] [-c cipher_spec]\n"
1.251 jmc 161: " [-D [bind_address:]port] [-e escape_char] [-F configfile]\n"
1.233 jmc 162: " [-i identity_file] [-L [bind_address:]port:host:hostport]\n"
1.232 djm 163: " [-l login_name] [-m mac_spec] [-O ctl_cmd] [-o option] [-p port]\n"
1.233 jmc 164: " [-R [bind_address:]port:host:hostport] [-S ctl_path]\n"
1.255 reyk 165: " [-w tunnel:tunnel] [user@]hostname [command]\n"
1.208 markus 166: );
1.257 ! dtucker 167: exit(255);
1.1 deraadt 168: }
169:
1.126 itojun 170: static int ssh_session(void);
171: static int ssh_session2(void);
172: static void load_public_identity_files(void);
1.214 djm 173: static void control_client(const char *path);
1.45 markus 174:
1.32 deraadt 175: /*
176: * Main program for the ssh client.
177: */
1.2 provos 178: int
179: main(int ac, char **av)
1.1 deraadt 180: {
1.178 markus 181: int i, opt, exit_status;
1.205 markus 182: char *p, *cp, *line, buf[256];
1.31 markus 183: struct stat st;
1.98 markus 184: struct passwd *pw;
1.45 markus 185: int dummy;
1.144 stevesk 186: extern int optind, optreset;
187: extern char *optarg;
1.244 djm 188: struct servent *sp;
1.232 djm 189: Forward fwd;
1.250 djm 190:
191: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
192: sanitise_stdfd();
1.31 markus 193:
1.33 markus 194: /*
195: * Save the original real uid. It will be needed later (uid-swapping
196: * may clobber the real uid).
197: */
1.31 markus 198: original_real_uid = getuid();
199: original_effective_uid = geteuid();
200:
1.184 stevesk 201: /*
202: * Use uid-swapping to give up root privileges for the duration of
203: * option processing. We will re-instantiate the rights when we are
204: * ready to create the privileged port, and will permanently drop
205: * them when the port has been created (actually, when the connection
206: * has been made, as we may need to create the port several times).
207: */
208: PRIV_END;
209:
1.31 markus 210: /* If we are installed setuid root be careful to not drop core. */
211: if (original_real_uid != original_effective_uid) {
212: struct rlimit rlim;
213: rlim.rlim_cur = rlim.rlim_max = 0;
214: if (setrlimit(RLIMIT_CORE, &rlim) < 0)
215: fatal("setrlimit failed: %.100s", strerror(errno));
1.1 deraadt 216: }
1.107 markus 217: /* Get user data. */
218: pw = getpwuid(original_real_uid);
219: if (!pw) {
1.191 itojun 220: logit("You don't exist, go away!");
1.257 ! dtucker 221: exit(255);
1.107 markus 222: }
223: /* Take a copy of the returned structure. */
224: pw = pwcopy(pw);
1.31 markus 225:
1.33 markus 226: /*
227: * Set our umask to something reasonable, as some files are created
228: * with the default umask. This will make them world-readable but
229: * writable only by the owner, which is ok for all files for which we
230: * don't set the modes explicitly.
231: */
1.31 markus 232: umask(022);
233:
234: /* Initialize option structure to indicate that no values have been set. */
235: initialize_options(&options);
236:
237: /* Parse command-line arguments. */
238: host = NULL;
239:
1.128 fgsch 240: again:
241: while ((opt = getopt(ac, av,
1.255 reyk 242: "1246ab:c:e:fgi:kl:m:no:p:qstvxACD:F:I:L:MNO:PR:S:TVw:XY")) != -1) {
1.31 markus 243: switch (opt) {
1.91 jakob 244: case '1':
245: options.protocol = SSH_PROTO_1;
246: break;
1.47 markus 247: case '2':
248: options.protocol = SSH_PROTO_2;
249: break;
1.37 markus 250: case '4':
1.196 djm 251: options.address_family = AF_INET;
1.37 markus 252: break;
253: case '6':
1.196 djm 254: options.address_family = AF_INET6;
1.37 markus 255: break;
1.31 markus 256: case 'n':
257: stdin_null_flag = 1;
258: break;
259: case 'f':
260: fork_after_authentication_flag = 1;
261: stdin_null_flag = 1;
262: break;
263: case 'x':
264: options.forward_x11 = 0;
265: break;
266: case 'X':
267: options.forward_x11 = 1;
268: break;
1.202 markus 269: case 'Y':
270: options.forward_x11 = 1;
271: options.forward_x11_trusted = 1;
272: break;
1.31 markus 273: case 'g':
274: options.gateway_ports = 1;
275: break;
1.229 djm 276: case 'O':
277: if (strcmp(optarg, "check") == 0)
278: mux_command = SSHMUX_COMMAND_ALIVE_CHECK;
279: else if (strcmp(optarg, "exit") == 0)
280: mux_command = SSHMUX_COMMAND_TERMINATE;
281: else
282: fatal("Invalid multiplex command.");
283: break;
1.183 stevesk 284: case 'P': /* deprecated */
1.31 markus 285: options.use_privileged_port = 0;
286: break;
287: case 'a':
288: options.forward_agent = 0;
1.53 markus 289: break;
290: case 'A':
291: options.forward_agent = 1;
1.31 markus 292: break;
293: case 'k':
1.204 dtucker 294: options.gss_deleg_creds = 0;
1.31 markus 295: break;
296: case 'i':
297: if (stat(optarg, &st) < 0) {
1.128 fgsch 298: fprintf(stderr, "Warning: Identity file %s "
1.231 otto 299: "not accessible: %s.\n", optarg,
300: strerror(errno));
1.31 markus 301: break;
302: }
1.128 fgsch 303: if (options.num_identity_files >=
304: SSH_MAX_IDENTITY_FILES)
305: fatal("Too many identity files specified "
306: "(max %d)", SSH_MAX_IDENTITY_FILES);
307: options.identity_files[options.num_identity_files++] =
308: xstrdup(optarg);
1.31 markus 309: break;
1.127 markus 310: case 'I':
311: #ifdef SMARTCARD
1.133 markus 312: options.smartcard_device = xstrdup(optarg);
1.137 jakob 313: #else
1.127 markus 314: fprintf(stderr, "no support for smartcards.\n");
1.137 jakob 315: #endif
1.127 markus 316: break;
1.31 markus 317: case 't':
1.79 markus 318: if (tty_flag)
319: force_tty_flag = 1;
1.31 markus 320: tty_flag = 1;
321: break;
322: case 'v':
1.197 markus 323: if (debug_flag == 0) {
1.66 markus 324: debug_flag = 1;
325: options.log_level = SYSLOG_LEVEL_DEBUG1;
1.197 markus 326: } else {
327: if (options.log_level < SYSLOG_LEVEL_DEBUG3)
328: options.log_level++;
1.66 markus 329: break;
1.197 markus 330: }
1.227 deraadt 331: /* FALLTHROUGH */
1.31 markus 332: case 'V':
1.209 markus 333: fprintf(stderr, "%s, %s\n",
334: SSH_VERSION, SSLeay_version(SSLEAY_VERSION));
1.31 markus 335: if (opt == 'V')
336: exit(0);
337: break;
1.255 reyk 338: case 'w':
1.256 reyk 339: if (options.tun_open == -1)
340: options.tun_open = SSH_TUNMODE_DEFAULT;
1.255 reyk 341: options.tun_local = a2tun(optarg, &options.tun_remote);
1.256 reyk 342: if (options.tun_local == SSH_TUNID_ERR) {
1.255 reyk 343: fprintf(stderr, "Bad tun device '%s'\n", optarg);
1.257 ! dtucker 344: exit(255);
1.255 reyk 345: }
346: break;
1.31 markus 347: case 'q':
348: options.log_level = SYSLOG_LEVEL_QUIET;
349: break;
350: case 'e':
351: if (optarg[0] == '^' && optarg[2] == 0 &&
1.128 fgsch 352: (u_char) optarg[1] >= 64 &&
353: (u_char) optarg[1] < 128)
1.78 markus 354: options.escape_char = (u_char) optarg[1] & 31;
1.31 markus 355: else if (strlen(optarg) == 1)
1.78 markus 356: options.escape_char = (u_char) optarg[0];
1.31 markus 357: else if (strcmp(optarg, "none") == 0)
1.119 stevesk 358: options.escape_char = SSH_ESCAPECHAR_NONE;
1.31 markus 359: else {
1.128 fgsch 360: fprintf(stderr, "Bad escape character '%s'.\n",
361: optarg);
1.257 ! dtucker 362: exit(255);
1.31 markus 363: }
364: break;
365: case 'c':
1.49 markus 366: if (ciphers_valid(optarg)) {
367: /* SSH2 only */
368: options.ciphers = xstrdup(optarg);
1.224 markus 369: options.cipher = SSH_CIPHER_INVALID;
1.49 markus 370: } else {
371: /* SSH1 only */
1.74 markus 372: options.cipher = cipher_number(optarg);
373: if (options.cipher == -1) {
1.128 fgsch 374: fprintf(stderr,
375: "Unknown cipher type '%s'\n",
376: optarg);
1.257 ! dtucker 377: exit(255);
1.49 markus 378: }
1.128 fgsch 379: if (options.cipher == SSH_CIPHER_3DES)
1.74 markus 380: options.ciphers = "3des-cbc";
1.128 fgsch 381: else if (options.cipher == SSH_CIPHER_BLOWFISH)
1.74 markus 382: options.ciphers = "blowfish-cbc";
1.128 fgsch 383: else
1.74 markus 384: options.ciphers = (char *)-1;
1.95 markus 385: }
386: break;
387: case 'm':
388: if (mac_valid(optarg))
389: options.macs = xstrdup(optarg);
390: else {
1.128 fgsch 391: fprintf(stderr, "Unknown mac type '%s'\n",
392: optarg);
1.257 ! dtucker 393: exit(255);
1.31 markus 394: }
395: break;
1.214 djm 396: case 'M':
1.242 djm 397: if (options.control_master == SSHCTL_MASTER_YES)
398: options.control_master = SSHCTL_MASTER_ASK;
399: else
400: options.control_master = SSHCTL_MASTER_YES;
1.214 djm 401: break;
1.31 markus 402: case 'p':
1.113 stevesk 403: options.port = a2port(optarg);
404: if (options.port == 0) {
1.109 markus 405: fprintf(stderr, "Bad port '%s'\n", optarg);
1.257 ! dtucker 406: exit(255);
1.109 markus 407: }
1.31 markus 408: break;
409: case 'l':
410: options.user = optarg;
411: break;
1.141 stevesk 412:
413: case 'L':
1.232 djm 414: if (parse_forward(&fwd, optarg))
415: add_local_forward(&options, &fwd);
416: else {
1.128 fgsch 417: fprintf(stderr,
1.232 djm 418: "Bad local forwarding specification '%s'\n",
1.128 fgsch 419: optarg);
1.257 ! dtucker 420: exit(255);
1.31 markus 421: }
1.232 djm 422: break;
423:
424: case 'R':
425: if (parse_forward(&fwd, optarg)) {
426: add_remote_forward(&options, &fwd);
427: } else {
1.128 fgsch 428: fprintf(stderr,
1.232 djm 429: "Bad remote forwarding specification "
430: "'%s'\n", optarg);
1.257 ! dtucker 431: exit(255);
1.31 markus 432: }
433: break;
1.108 markus 434:
435: case 'D':
1.232 djm 436: cp = p = xstrdup(optarg);
437: memset(&fwd, '\0', sizeof(fwd));
438: fwd.connect_host = "socks";
439: if ((fwd.listen_host = hpdelim(&cp)) == NULL) {
440: fprintf(stderr, "Bad dynamic forwarding "
441: "specification '%.100s'\n", optarg);
1.257 ! dtucker 442: exit(255);
1.232 djm 443: }
444: if (cp != NULL) {
445: fwd.listen_port = a2port(cp);
446: fwd.listen_host = cleanhostname(fwd.listen_host);
447: } else {
448: fwd.listen_port = a2port(fwd.listen_host);
1.249 djm 449: fwd.listen_host = NULL;
1.232 djm 450: }
451:
452: if (fwd.listen_port == 0) {
1.128 fgsch 453: fprintf(stderr, "Bad dynamic port '%s'\n",
454: optarg);
1.257 ! dtucker 455: exit(255);
1.109 markus 456: }
1.232 djm 457: add_local_forward(&options, &fwd);
458: xfree(p);
1.108 markus 459: break;
460:
1.31 markus 461: case 'C':
462: options.compression = 1;
463: break;
1.45 markus 464: case 'N':
465: no_shell_flag = 1;
466: no_tty_flag = 1;
467: break;
468: case 'T':
469: no_tty_flag = 1;
470: break;
1.31 markus 471: case 'o':
472: dummy = 1;
1.205 markus 473: line = xstrdup(optarg);
1.128 fgsch 474: if (process_config_line(&options, host ? host : "",
1.205 markus 475: line, "command-line", 0, &dummy) != 0)
1.257 ! dtucker 476: exit(255);
1.205 markus 477: xfree(line);
1.31 markus 478: break;
1.85 djm 479: case 's':
480: subsystem_flag = 1;
1.117 markus 481: break;
1.214 djm 482: case 'S':
483: if (options.control_path != NULL)
484: free(options.control_path);
485: options.control_path = xstrdup(optarg);
486: break;
1.117 markus 487: case 'b':
488: options.bind_address = optarg;
1.85 djm 489: break;
1.139 markus 490: case 'F':
491: config = optarg;
492: break;
1.31 markus 493: default:
494: usage();
1.1 deraadt 495: }
1.31 markus 496: }
497:
1.128 fgsch 498: ac -= optind;
499: av += optind;
500:
501: if (ac > 0 && !host && **av != '-') {
1.188 markus 502: if (strrchr(*av, '@')) {
1.128 fgsch 503: p = xstrdup(*av);
1.188 markus 504: cp = strrchr(p, '@');
1.128 fgsch 505: if (cp == NULL || cp == p)
506: usage();
507: options.user = p;
508: *cp = '\0';
509: host = ++cp;
510: } else
511: host = *av;
1.189 millert 512: if (ac > 1) {
513: optind = optreset = 1;
1.128 fgsch 514: goto again;
515: }
1.189 millert 516: ac--, av++;
1.128 fgsch 517: }
518:
1.31 markus 519: /* Check that we got a host name. */
520: if (!host)
521: usage();
522:
1.54 markus 523: SSLeay_add_all_algorithms();
1.72 markus 524: ERR_load_crypto_strings();
1.31 markus 525:
526: /* Initialize the command to execute on remote host. */
527: buffer_init(&command);
1.1 deraadt 528:
1.33 markus 529: /*
530: * Save the command to execute on the remote host in a buffer. There
531: * is no limit on the length of the command, except by the maximum
532: * packet size. Also sets the tty flag if there is no command.
533: */
1.128 fgsch 534: if (!ac) {
1.31 markus 535: /* No command specified - execute shell on a tty. */
536: tty_flag = 1;
1.85 djm 537: if (subsystem_flag) {
1.128 fgsch 538: fprintf(stderr,
539: "You must specify a subsystem to invoke.\n");
1.85 djm 540: usage();
541: }
1.31 markus 542: } else {
1.128 fgsch 543: /* A command has been specified. Store it into the buffer. */
544: for (i = 0; i < ac; i++) {
545: if (i)
1.31 markus 546: buffer_append(&command, " ", 1);
547: buffer_append(&command, av[i], strlen(av[i]));
548: }
549: }
550:
551: /* Cannot fork to background if no command. */
1.63 markus 552: if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag)
1.31 markus 553: fatal("Cannot fork into background without a command to execute.");
554:
555: /* Allocate a tty by default if no command specified. */
556: if (buffer_len(&command) == 0)
557: tty_flag = 1;
558:
1.180 deraadt 559: /* Force no tty */
1.75 markus 560: if (no_tty_flag)
561: tty_flag = 0;
1.31 markus 562: /* Do not allocate a tty if stdin is not a tty. */
1.236 djm 563: if ((!isatty(fileno(stdin)) || stdin_null_flag) && !force_tty_flag) {
1.31 markus 564: if (tty_flag)
1.191 itojun 565: logit("Pseudo-terminal will not be allocated because stdin is not a terminal.");
1.31 markus 566: tty_flag = 0;
567: }
1.45 markus 568:
1.101 markus 569: /*
570: * Initialize "log" output. Since we are the client all output
571: * actually goes to stderr.
572: */
1.111 markus 573: log_init(av[0], options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level,
574: SYSLOG_FACILITY_USER, 1);
1.31 markus 575:
1.139 markus 576: /*
577: * Read per-user configuration file. Ignore the system wide config
578: * file if the user specifies a config file on the command line.
579: */
580: if (config != NULL) {
1.211 djm 581: if (!read_config_file(config, host, &options, 0))
1.142 stevesk 582: fatal("Can't open user config file %.100s: "
583: "%.100s", config, strerror(errno));
1.139 markus 584: } else {
585: snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir,
586: _PATH_SSH_USER_CONFFILE);
1.210 djm 587: (void)read_config_file(buf, host, &options, 1);
1.139 markus 588:
1.145 markus 589: /* Read systemwide configuration file after use config. */
1.223 deraadt 590: (void)read_config_file(_PATH_HOST_CONFIG_FILE, host,
1.210 djm 591: &options, 0);
1.139 markus 592: }
1.31 markus 593:
594: /* Fill configuration defaults. */
595: fill_default_options(&options);
596:
1.196 djm 597: channel_set_af(options.address_family);
598:
1.31 markus 599: /* reinit */
1.101 markus 600: log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 1);
1.31 markus 601:
602: if (options.user == NULL)
603: options.user = xstrdup(pw->pw_name);
604:
605: if (options.hostname != NULL)
606: host = options.hostname;
1.195 markus 607:
608: /* force lowercase for hostkey matching */
609: if (options.host_key_alias != NULL) {
610: for (p = options.host_key_alias; *p; p++)
611: if (isupper(*p))
612: *p = tolower(*p);
613: }
1.190 markus 614:
1.246 djm 615: /* Get default port if port has not been set. */
616: if (options.port == 0) {
617: sp = getservbyname(SSH_SERVICE_NAME, "tcp");
618: options.port = sp ? ntohs(sp->s_port) : SSH_DEFAULT_PORT;
619: }
620:
1.190 markus 621: if (options.proxy_command != NULL &&
622: strcmp(options.proxy_command, "none") == 0)
623: options.proxy_command = NULL;
1.245 djm 624: if (options.control_path != NULL &&
625: strcmp(options.control_path, "none") == 0)
626: options.control_path = NULL;
1.31 markus 627:
1.214 djm 628: if (options.control_path != NULL) {
1.241 djm 629: snprintf(buf, sizeof(buf), "%d", options.port);
630: cp = tilde_expand_filename(options.control_path,
631: original_real_uid);
632: options.control_path = percent_expand(cp, "p", buf, "h", host,
633: "r", options.user, (char *)NULL);
634: xfree(cp);
1.214 djm 635: }
1.240 djm 636: if (mux_command != 0 && options.control_path == NULL)
637: fatal("No ControlPath specified for \"-O\" command");
1.242 djm 638: if (options.control_path != NULL)
1.237 jakob 639: control_client(options.control_path);
1.214 djm 640:
1.77 markus 641: /* Open a connection to the remote host. */
1.203 djm 642: if (ssh_connect(host, &hostaddr, options.port,
1.196 djm 643: options.address_family, options.connection_attempts,
1.177 markus 644: original_effective_uid == 0 && options.use_privileged_port,
1.179 markus 645: options.proxy_command) != 0)
1.257 ! dtucker 646: exit(255);
1.31 markus 647:
1.33 markus 648: /*
649: * If we successfully made the connection, load the host private key
650: * in case we will need it later for combined rsa-rhosts
651: * authentication. This must be done before releasing extra
652: * privileges, because the file is only readable by root.
1.174 markus 653: * If we cannot access the private keys, load the public keys
654: * instead and try to execute the ssh-keysign helper instead.
1.33 markus 655: */
1.112 markus 656: sensitive_data.nkeys = 0;
657: sensitive_data.keys = NULL;
1.173 markus 658: sensitive_data.external_keysign = 0;
1.178 markus 659: if (options.rhosts_rsa_authentication ||
660: options.hostbased_authentication) {
1.112 markus 661: sensitive_data.nkeys = 3;
1.180 deraadt 662: sensitive_data.keys = xmalloc(sensitive_data.nkeys *
663: sizeof(Key));
1.177 markus 664:
665: PRIV_START;
1.112 markus 666: sensitive_data.keys[0] = key_load_private_type(KEY_RSA1,
1.105 markus 667: _PATH_HOST_KEY_FILE, "", NULL);
1.112 markus 668: sensitive_data.keys[1] = key_load_private_type(KEY_DSA,
669: _PATH_HOST_DSA_KEY_FILE, "", NULL);
670: sensitive_data.keys[2] = key_load_private_type(KEY_RSA,
671: _PATH_HOST_RSA_KEY_FILE, "", NULL);
1.177 markus 672: PRIV_END;
1.173 markus 673:
1.181 markus 674: if (options.hostbased_authentication == 1 &&
675: sensitive_data.keys[0] == NULL &&
1.173 markus 676: sensitive_data.keys[1] == NULL &&
677: sensitive_data.keys[2] == NULL) {
678: sensitive_data.keys[1] = key_load_public(
679: _PATH_HOST_DSA_KEY_FILE, NULL);
680: sensitive_data.keys[2] = key_load_public(
681: _PATH_HOST_RSA_KEY_FILE, NULL);
682: sensitive_data.external_keysign = 1;
683: }
1.31 markus 684: }
1.33 markus 685: /*
686: * Get rid of any extra privileges that we may have. We will no
687: * longer need them. Also, extra privileges could make it very hard
688: * to read identity files and other non-world-readable files from the
689: * user's home directory if it happens to be on a NFS volume where
690: * root is mapped to nobody.
691: */
1.225 dtucker 692: if (original_effective_uid == 0) {
693: PRIV_START;
694: permanently_set_uid(pw);
695: }
1.31 markus 696:
1.33 markus 697: /*
698: * Now that we are back to our own permissions, create ~/.ssh
1.254 djm 699: * directory if it doesn't already exist.
1.33 markus 700: */
1.138 jakob 701: snprintf(buf, sizeof buf, "%.100s%s%.100s", pw->pw_dir, strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR);
1.31 markus 702: if (stat(buf, &st) < 0)
1.57 djm 703: if (mkdir(buf, 0700) < 0)
1.31 markus 704: error("Could not create directory '%.200s'.", buf);
705:
1.104 markus 706: /* load options.identity_files */
707: load_public_identity_files();
708:
709: /* Expand ~ in known host file names. */
710: /* XXX mem-leaks: */
1.72 markus 711: options.system_hostfile =
712: tilde_expand_filename(options.system_hostfile, original_real_uid);
713: options.user_hostfile =
714: tilde_expand_filename(options.user_hostfile, original_real_uid);
715: options.system_hostfile2 =
716: tilde_expand_filename(options.system_hostfile2, original_real_uid);
717: options.user_hostfile2 =
718: tilde_expand_filename(options.user_hostfile2, original_real_uid);
1.149 markus 719:
720: signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
1.31 markus 721:
722: /* Log into the remote system. This never returns if the login fails. */
1.173 markus 723: ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr, pw);
1.31 markus 724:
1.112 markus 725: /* We no longer need the private host keys. Clear them now. */
726: if (sensitive_data.nkeys != 0) {
727: for (i = 0; i < sensitive_data.nkeys; i++) {
728: if (sensitive_data.keys[i] != NULL) {
729: /* Destroys contents safely */
730: debug3("clear hostkey %d", i);
731: key_free(sensitive_data.keys[i]);
732: sensitive_data.keys[i] = NULL;
733: }
734: }
735: xfree(sensitive_data.keys);
1.134 markus 736: }
737: for (i = 0; i < options.num_identity_files; i++) {
738: if (options.identity_files[i]) {
739: xfree(options.identity_files[i]);
740: options.identity_files[i] = NULL;
741: }
742: if (options.identity_keys[i]) {
743: key_free(options.identity_keys[i]);
744: options.identity_keys[i] = NULL;
745: }
1.112 markus 746: }
1.31 markus 747:
1.45 markus 748: exit_status = compat20 ? ssh_session2() : ssh_session();
749: packet_close();
1.186 djm 750:
1.214 djm 751: if (options.control_path != NULL && control_fd != -1)
752: unlink(options.control_path);
753:
1.186 djm 754: /*
1.203 djm 755: * Send SIGHUP to proxy command if used. We don't wait() in
1.186 djm 756: * case it hangs and instead rely on init to reap the child
757: */
758: if (proxy_command_pid > 1)
759: kill(proxy_command_pid, SIGHUP);
760:
1.45 markus 761: return exit_status;
762: }
763:
1.126 itojun 764: static void
1.70 markus 765: ssh_init_forwarding(void)
766: {
1.86 markus 767: int success = 0;
1.70 markus 768: int i;
1.86 markus 769:
1.70 markus 770: /* Initiate local TCP/IP port forwardings. */
771: for (i = 0; i < options.num_local_forwards; i++) {
1.232 djm 772: debug("Local connections to %.200s:%d forwarded to remote "
773: "address %.200s:%d",
1.234 deraadt 774: (options.local_forwards[i].listen_host == NULL) ?
775: (options.gateway_ports ? "*" : "LOCALHOST") :
1.232 djm 776: options.local_forwards[i].listen_host,
777: options.local_forwards[i].listen_port,
778: options.local_forwards[i].connect_host,
779: options.local_forwards[i].connect_port);
1.158 markus 780: success += channel_setup_local_fwd_listener(
1.232 djm 781: options.local_forwards[i].listen_host,
782: options.local_forwards[i].listen_port,
783: options.local_forwards[i].connect_host,
784: options.local_forwards[i].connect_port,
1.70 markus 785: options.gateway_ports);
786: }
1.86 markus 787: if (i > 0 && success == 0)
788: error("Could not request local forwarding.");
1.70 markus 789:
790: /* Initiate remote TCP/IP port forwardings. */
791: for (i = 0; i < options.num_remote_forwards; i++) {
1.232 djm 792: debug("Remote connections from %.200s:%d forwarded to "
793: "local address %.200s:%d",
1.248 djm 794: (options.remote_forwards[i].listen_host == NULL) ?
1.253 djm 795: "LOCALHOST" : options.remote_forwards[i].listen_host,
1.232 djm 796: options.remote_forwards[i].listen_port,
797: options.remote_forwards[i].connect_host,
798: options.remote_forwards[i].connect_port);
1.70 markus 799: channel_request_remote_forwarding(
1.232 djm 800: options.remote_forwards[i].listen_host,
801: options.remote_forwards[i].listen_port,
802: options.remote_forwards[i].connect_host,
803: options.remote_forwards[i].connect_port);
1.70 markus 804: }
805: }
806:
1.126 itojun 807: static void
1.70 markus 808: check_agent_present(void)
809: {
810: if (options.forward_agent) {
1.254 djm 811: /* Clear agent forwarding if we don't have an agent. */
1.185 stevesk 812: if (!ssh_agent_present())
1.70 markus 813: options.forward_agent = 0;
814: }
815: }
816:
1.126 itojun 817: static int
1.45 markus 818: ssh_session(void)
819: {
820: int type;
821: int interactive = 0;
822: int have_tty = 0;
823: struct winsize ws;
824: char *cp;
1.243 djm 825: const char *display;
1.45 markus 826:
1.31 markus 827: /* Enable compression if requested. */
828: if (options.compression) {
829: debug("Requesting compression at level %d.", options.compression_level);
830:
831: if (options.compression_level < 1 || options.compression_level > 9)
832: fatal("Compression level must be from 1 (fast) to 9 (slow, best).");
833:
834: /* Send the request. */
835: packet_start(SSH_CMSG_REQUEST_COMPRESSION);
836: packet_put_int(options.compression_level);
837: packet_send();
838: packet_write_wait();
1.156 markus 839: type = packet_read();
1.31 markus 840: if (type == SSH_SMSG_SUCCESS)
841: packet_start_compression(options.compression_level);
842: else if (type == SSH_SMSG_FAILURE)
1.191 itojun 843: logit("Warning: Remote host refused compression.");
1.31 markus 844: else
845: packet_disconnect("Protocol error waiting for compression response.");
846: }
847: /* Allocate a pseudo tty if appropriate. */
848: if (tty_flag) {
849: debug("Requesting pty.");
850:
851: /* Start the packet. */
852: packet_start(SSH_CMSG_REQUEST_PTY);
853:
854: /* Store TERM in the packet. There is no limit on the
855: length of the string. */
856: cp = getenv("TERM");
857: if (!cp)
858: cp = "";
1.124 markus 859: packet_put_cstring(cp);
1.31 markus 860:
861: /* Store window size in the packet. */
862: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
863: memset(&ws, 0, sizeof(ws));
864: packet_put_int(ws.ws_row);
865: packet_put_int(ws.ws_col);
866: packet_put_int(ws.ws_xpixel);
867: packet_put_int(ws.ws_ypixel);
868:
869: /* Store tty modes in the packet. */
1.115 stevesk 870: tty_make_modes(fileno(stdin), NULL);
1.31 markus 871:
872: /* Send the packet, and wait for it to leave. */
873: packet_send();
874: packet_write_wait();
875:
876: /* Read response from the server. */
1.156 markus 877: type = packet_read();
1.43 markus 878: if (type == SSH_SMSG_SUCCESS) {
1.31 markus 879: interactive = 1;
1.45 markus 880: have_tty = 1;
1.43 markus 881: } else if (type == SSH_SMSG_FAILURE)
1.191 itojun 882: logit("Warning: Remote host failed or refused to allocate a pseudo tty.");
1.31 markus 883: else
884: packet_disconnect("Protocol error waiting for pty request response.");
885: }
886: /* Request X11 forwarding if enabled and DISPLAY is set. */
1.243 djm 887: display = getenv("DISPLAY");
888: if (options.forward_x11 && display != NULL) {
1.150 stevesk 889: char *proto, *data;
1.50 markus 890: /* Get reasonable local authentication information. */
1.243 djm 891: client_x11_get_proto(display, options.xauth_location,
892: options.forward_x11_trusted, &proto, &data);
1.50 markus 893: /* Request forwarding with authentication spoofing. */
1.31 markus 894: debug("Requesting X11 forwarding with authentication spoofing.");
1.243 djm 895: x11_request_forwarding_with_spoofing(0, display, proto, data);
1.31 markus 896:
897: /* Read response from the server. */
1.156 markus 898: type = packet_read();
1.31 markus 899: if (type == SSH_SMSG_SUCCESS) {
900: interactive = 1;
1.50 markus 901: } else if (type == SSH_SMSG_FAILURE) {
1.191 itojun 902: logit("Warning: Remote host denied X11 forwarding.");
1.50 markus 903: } else {
1.31 markus 904: packet_disconnect("Protocol error waiting for X11 forwarding");
1.50 markus 905: }
1.31 markus 906: }
907: /* Tell the packet module whether this is an interactive session. */
1.80 markus 908: packet_set_interactive(interactive);
1.31 markus 909:
910: /* Request authentication agent forwarding if appropriate. */
1.70 markus 911: check_agent_present();
912:
1.31 markus 913: if (options.forward_agent) {
914: debug("Requesting authentication agent forwarding.");
915: auth_request_forwarding();
916:
917: /* Read response from the server. */
1.156 markus 918: type = packet_read();
1.155 markus 919: packet_check_eom();
1.31 markus 920: if (type != SSH_SMSG_SUCCESS)
1.191 itojun 921: logit("Warning: Remote host denied authentication agent forwarding.");
1.31 markus 922: }
923:
1.70 markus 924: /* Initiate port forwardings. */
925: ssh_init_forwarding();
1.34 markus 926:
927: /* If requested, let ssh continue in the background. */
1.48 markus 928: if (fork_after_authentication_flag)
1.34 markus 929: if (daemon(1, 1) < 0)
930: fatal("daemon() failed: %.200s", strerror(errno));
1.31 markus 931:
1.33 markus 932: /*
933: * If a command was specified on the command line, execute the
934: * command now. Otherwise request the server to start a shell.
935: */
1.31 markus 936: if (buffer_len(&command) > 0) {
937: int len = buffer_len(&command);
938: if (len > 900)
939: len = 900;
1.152 stevesk 940: debug("Sending command: %.*s", len, (u_char *)buffer_ptr(&command));
1.31 markus 941: packet_start(SSH_CMSG_EXEC_CMD);
942: packet_put_string(buffer_ptr(&command), buffer_len(&command));
943: packet_send();
944: packet_write_wait();
945: } else {
946: debug("Requesting shell.");
947: packet_start(SSH_CMSG_EXEC_SHELL);
948: packet_send();
949: packet_write_wait();
950: }
951:
952: /* Enter the interactive session. */
1.119 stevesk 953: return client_loop(have_tty, tty_flag ?
954: options.escape_char : SSH_ESCAPECHAR_NONE, 0);
1.45 markus 955: }
956:
1.126 itojun 957: static void
1.214 djm 958: ssh_subsystem_reply(int type, u_int32_t seq, void *ctxt)
1.89 markus 959: {
960: int id, len;
961:
962: id = packet_get_int();
963: len = buffer_len(&command);
1.100 markus 964: if (len > 900)
965: len = 900;
1.155 markus 966: packet_check_eom();
1.89 markus 967: if (type == SSH2_MSG_CHANNEL_FAILURE)
968: fatal("Request for subsystem '%.*s' failed on channel %d",
1.152 stevesk 969: len, (u_char *)buffer_ptr(&command), id);
1.170 markus 970: }
971:
972: void
1.206 markus 973: client_global_request_reply_fwd(int type, u_int32_t seq, void *ctxt)
1.170 markus 974: {
975: int i;
976:
977: i = client_global_request_id++;
1.206 markus 978: if (i >= options.num_remote_forwards)
1.170 markus 979: return;
980: debug("remote forward %s for: listen %d, connect %s:%d",
981: type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
1.232 djm 982: options.remote_forwards[i].listen_port,
983: options.remote_forwards[i].connect_host,
984: options.remote_forwards[i].connect_port);
1.170 markus 985: if (type == SSH2_MSG_REQUEST_FAILURE)
1.232 djm 986: logit("Warning: remote port forwarding failed for listen "
987: "port %d", options.remote_forwards[i].listen_port);
1.89 markus 988: }
989:
1.126 itojun 990: static void
1.214 djm 991: ssh_control_listener(void)
1.45 markus 992: {
1.214 djm 993: struct sockaddr_un addr;
994: mode_t old_umask;
1.223 deraadt 995:
1.242 djm 996: if (options.control_path == NULL ||
997: options.control_master == SSHCTL_MASTER_NO)
1.214 djm 998: return;
999:
1.242 djm 1000: debug("setting up multiplex master socket");
1001:
1.214 djm 1002: memset(&addr, '\0', sizeof(addr));
1003: addr.sun_family = AF_UNIX;
1004: addr.sun_len = offsetof(struct sockaddr_un, sun_path) +
1005: strlen(options.control_path) + 1;
1006:
1007: if (strlcpy(addr.sun_path, options.control_path,
1008: sizeof(addr.sun_path)) >= sizeof(addr.sun_path))
1009: fatal("ControlPath too long");
1010:
1011: if ((control_fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0)
1.252 stevesk 1012: fatal("%s socket(): %s", __func__, strerror(errno));
1.214 djm 1013:
1014: old_umask = umask(0177);
1015: if (bind(control_fd, (struct sockaddr*)&addr, addr.sun_len) == -1) {
1016: control_fd = -1;
1.238 djm 1017: if (errno == EINVAL || errno == EADDRINUSE)
1.214 djm 1018: fatal("ControlSocket %s already exists",
1019: options.control_path);
1020: else
1.252 stevesk 1021: fatal("%s bind(): %s", __func__, strerror(errno));
1.214 djm 1022: }
1023: umask(old_umask);
1.80 markus 1024:
1.214 djm 1025: if (listen(control_fd, 64) == -1)
1.252 stevesk 1026: fatal("%s listen(): %s", __func__, strerror(errno));
1.31 markus 1027:
1.214 djm 1028: set_nonblock(control_fd);
1029: }
1.45 markus 1030:
1.214 djm 1031: /* request pty/x11/agent/tcpfwd/shell for channel */
1032: static void
1033: ssh_session2_setup(int id, void *arg)
1034: {
1.215 djm 1035: extern char **environ;
1.243 djm 1036: const char *display;
1037: int interactive = tty_flag;
1.215 djm 1038:
1.248 djm 1039: display = getenv("DISPLAY");
1.243 djm 1040: if (options.forward_x11 && display != NULL) {
1.150 stevesk 1041: char *proto, *data;
1.50 markus 1042: /* Get reasonable local authentication information. */
1.243 djm 1043: client_x11_get_proto(display, options.xauth_location,
1044: options.forward_x11_trusted, &proto, &data);
1.50 markus 1045: /* Request forwarding with authentication spoofing. */
1046: debug("Requesting X11 forwarding with authentication spoofing.");
1.243 djm 1047: x11_request_forwarding_with_spoofing(id, display, proto, data);
1.80 markus 1048: interactive = 1;
1.50 markus 1049: /* XXX wait for reply */
1050: }
1051:
1.70 markus 1052: check_agent_present();
1053: if (options.forward_agent) {
1054: debug("Requesting authentication agent forwarding.");
1055: channel_request_start(id, "auth-agent-req@openssh.com", 0);
1056: packet_send();
1.212 djm 1057: }
1058:
1.256 reyk 1059: if (options.tun_open != SSH_TUNMODE_NO) {
1.255 reyk 1060: Channel *c;
1061: int fd;
1062:
1063: debug("Requesting tun.");
1.256 reyk 1064: if ((fd = tun_open(options.tun_local,
1065: options.tun_open)) >= 0) {
1.255 reyk 1066: c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1,
1067: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT,
1068: 0, "tun", 1);
1069: c->datagram = 1;
1070: packet_start(SSH2_MSG_CHANNEL_OPEN);
1071: packet_put_cstring("tun@openssh.com");
1072: packet_put_int(c->self);
1073: packet_put_int(c->local_window_max);
1074: packet_put_int(c->local_maxpacket);
1.256 reyk 1075: packet_put_int(options.tun_open);
1.255 reyk 1076: packet_put_int(options.tun_remote);
1077: packet_send();
1078: }
1079: }
1080:
1.214 djm 1081: client_session2_setup(id, tty_flag, subsystem_flag, getenv("TERM"),
1.215 djm 1082: NULL, fileno(stdin), &command, environ, &ssh_subsystem_reply);
1.90 markus 1083:
1.80 markus 1084: packet_set_interactive(interactive);
1.45 markus 1085: }
1086:
1.143 markus 1087: /* open new channel for a session */
1.126 itojun 1088: static int
1.143 markus 1089: ssh_session2_open(void)
1.45 markus 1090: {
1.118 markus 1091: Channel *c;
1092: int window, packetmax, in, out, err;
1.60 markus 1093:
1.62 markus 1094: if (stdin_null_flag) {
1.93 itojun 1095: in = open(_PATH_DEVNULL, O_RDONLY);
1.62 markus 1096: } else {
1097: in = dup(STDIN_FILENO);
1098: }
1.60 markus 1099: out = dup(STDOUT_FILENO);
1100: err = dup(STDERR_FILENO);
1.45 markus 1101:
1102: if (in < 0 || out < 0 || err < 0)
1.62 markus 1103: fatal("dup() in/out/err failed");
1.45 markus 1104:
1.69 markus 1105: /* enable nonblocking unless tty */
1106: if (!isatty(in))
1107: set_nonblock(in);
1108: if (!isatty(out))
1109: set_nonblock(out);
1110: if (!isatty(err))
1111: set_nonblock(err);
1112:
1.65 markus 1113: window = CHAN_SES_WINDOW_DEFAULT;
1114: packetmax = CHAN_SES_PACKET_DEFAULT;
1.164 markus 1115: if (tty_flag) {
1116: window >>= 1;
1117: packetmax >>= 1;
1.45 markus 1118: }
1.118 markus 1119: c = channel_new(
1.45 markus 1120: "session", SSH_CHANNEL_OPENING, in, out, err,
1.65 markus 1121: window, packetmax, CHAN_EXTENDED_WRITE,
1.192 markus 1122: "client-session", /*nonblock*/0);
1.45 markus 1123:
1.143 markus 1124: debug3("ssh_session2_open: channel_new: %d", c->self);
1.106 markus 1125:
1.122 markus 1126: channel_send_open(c->self);
1.143 markus 1127: if (!no_shell_flag)
1.214 djm 1128: channel_register_confirm(c->self, ssh_session2_setup, NULL);
1.106 markus 1129:
1.118 markus 1130: return c->self;
1.106 markus 1131: }
1132:
1.126 itojun 1133: static int
1.106 markus 1134: ssh_session2(void)
1135: {
1.143 markus 1136: int id = -1;
1.106 markus 1137:
1138: /* XXX should be pre-session */
1139: ssh_init_forwarding();
1.214 djm 1140: ssh_control_listener();
1.106 markus 1141:
1.143 markus 1142: if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN))
1143: id = ssh_session2_open();
1.255 reyk 1144:
1145: /* Execute a local command */
1146: if (options.local_command != NULL &&
1147: options.permit_local_command)
1148: ssh_local_cmd(options.local_command);
1.106 markus 1149:
1150: /* If requested, let ssh continue in the background. */
1151: if (fork_after_authentication_flag)
1152: if (daemon(1, 1) < 0)
1153: fatal("daemon() failed: %.200s", strerror(errno));
1.31 markus 1154:
1.119 stevesk 1155: return client_loop(tty_flag, tty_flag ?
1156: options.escape_char : SSH_ESCAPECHAR_NONE, id);
1.72 markus 1157: }
1158:
1.126 itojun 1159: static void
1.104 markus 1160: load_public_identity_files(void)
1161: {
1162: char *filename;
1.167 markus 1163: int i = 0;
1.104 markus 1164: Key *public;
1.167 markus 1165: #ifdef SMARTCARD
1166: Key **keys;
1.104 markus 1167:
1.133 markus 1168: if (options.smartcard_device != NULL &&
1.167 markus 1169: options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
1170: (keys = sc_get_keys(options.smartcard_device, NULL)) != NULL ) {
1171: int count = 0;
1172: for (i = 0; keys[i] != NULL; i++) {
1173: count++;
1174: memmove(&options.identity_files[1], &options.identity_files[0],
1175: sizeof(char *) * (SSH_MAX_IDENTITY_FILES - 1));
1176: memmove(&options.identity_keys[1], &options.identity_keys[0],
1177: sizeof(Key *) * (SSH_MAX_IDENTITY_FILES - 1));
1178: options.num_identity_files++;
1179: options.identity_keys[0] = keys[i];
1.194 markus 1180: options.identity_files[0] = sc_get_key_label(keys[i]);
1.167 markus 1181: }
1.168 markus 1182: if (options.num_identity_files > SSH_MAX_IDENTITY_FILES)
1183: options.num_identity_files = SSH_MAX_IDENTITY_FILES;
1.167 markus 1184: i = count;
1185: xfree(keys);
1.127 markus 1186: }
1.136 jakob 1187: #endif /* SMARTCARD */
1.131 millert 1188: for (; i < options.num_identity_files; i++) {
1189: filename = tilde_expand_filename(options.identity_files[i],
1190: original_real_uid);
1191: public = key_load_public(filename, NULL);
1192: debug("identity file %s type %d", filename,
1193: public ? public->type : -1);
1194: xfree(options.identity_files[i]);
1195: options.identity_files[i] = filename;
1196: options.identity_keys[i] = public;
1197: }
1.214 djm 1198: }
1199:
1200: static void
1201: control_client_sighandler(int signo)
1202: {
1203: control_client_terminate = signo;
1204: }
1205:
1206: static void
1207: control_client_sigrelay(int signo)
1208: {
1209: if (control_server_pid > 1)
1210: kill(control_server_pid, signo);
1211: }
1212:
1.220 djm 1213: static int
1214: env_permitted(char *env)
1215: {
1216: int i;
1217: char name[1024], *cp;
1218:
1219: strlcpy(name, env, sizeof(name));
1220: if ((cp = strchr(name, '=')) == NULL)
1221: return (0);
1222:
1223: *cp = '\0';
1224:
1225: for (i = 0; i < options.num_send_env; i++)
1226: if (match_pattern(name, options.send_env[i]))
1227: return (1);
1228:
1229: return (0);
1230: }
1231:
1.214 djm 1232: static void
1233: control_client(const char *path)
1234: {
1235: struct sockaddr_un addr;
1.228 djm 1236: int i, r, fd, sock, exitval, num_env;
1.214 djm 1237: Buffer m;
1.229 djm 1238: char *term;
1.215 djm 1239: extern char **environ;
1.229 djm 1240: u_int flags;
1.242 djm 1241:
1242: if (mux_command == 0)
1243: mux_command = SSHMUX_COMMAND_OPEN;
1244:
1245: switch (options.control_master) {
1246: case SSHCTL_MASTER_AUTO:
1247: case SSHCTL_MASTER_AUTO_ASK:
1248: debug("auto-mux: Trying existing master");
1249: /* FALLTHROUGH */
1250: case SSHCTL_MASTER_NO:
1251: break;
1252: default:
1253: return;
1254: }
1.228 djm 1255:
1.214 djm 1256: memset(&addr, '\0', sizeof(addr));
1257: addr.sun_family = AF_UNIX;
1258: addr.sun_len = offsetof(struct sockaddr_un, sun_path) +
1259: strlen(path) + 1;
1260:
1261: if (strlcpy(addr.sun_path, path,
1262: sizeof(addr.sun_path)) >= sizeof(addr.sun_path))
1263: fatal("ControlPath too long");
1264:
1265: if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) < 0)
1266: fatal("%s socket(): %s", __func__, strerror(errno));
1267:
1.237 jakob 1268: if (connect(sock, (struct sockaddr*)&addr, addr.sun_len) == -1) {
1.240 djm 1269: if (mux_command != SSHMUX_COMMAND_OPEN) {
1270: fatal("Control socket connect(%.100s): %s", path,
1271: strerror(errno));
1272: }
1.239 djm 1273: if (errno == ENOENT)
1274: debug("Control socket \"%.100s\" does not exist", path);
1275: else {
1276: error("Control socket connect(%.100s): %s", path,
1277: strerror(errno));
1278: }
1.237 jakob 1279: close(sock);
1280: return;
1281: }
1.248 djm 1282:
1.237 jakob 1283: if (stdin_null_flag) {
1284: if ((fd = open(_PATH_DEVNULL, O_RDONLY)) == -1)
1285: fatal("open(/dev/null): %s", strerror(errno));
1286: if (dup2(fd, STDIN_FILENO) == -1)
1287: fatal("dup2: %s", strerror(errno));
1288: if (fd > STDERR_FILENO)
1289: close(fd);
1290: }
1.248 djm 1291:
1.247 djm 1292: term = getenv("TERM");
1.229 djm 1293:
1294: flags = 0;
1295: if (tty_flag)
1296: flags |= SSHMUX_FLAG_TTY;
1297: if (subsystem_flag)
1298: flags |= SSHMUX_FLAG_SUBSYS;
1.247 djm 1299: if (options.forward_x11)
1300: flags |= SSHMUX_FLAG_X11_FWD;
1301: if (options.forward_agent)
1302: flags |= SSHMUX_FLAG_AGENT_FWD;
1.214 djm 1303:
1304: buffer_init(&m);
1305:
1.229 djm 1306: /* Send our command to server */
1307: buffer_put_int(&m, mux_command);
1308: buffer_put_int(&m, flags);
1.247 djm 1309: if (ssh_msg_send(sock, SSHMUX_VER, &m) == -1)
1.229 djm 1310: fatal("%s: msg_send", __func__);
1311: buffer_clear(&m);
1312:
1313: /* Get authorisation status and PID of controlee */
1.214 djm 1314: if (ssh_msg_recv(sock, &m) == -1)
1315: fatal("%s: msg_recv", __func__);
1.247 djm 1316: if (buffer_get_char(&m) != SSHMUX_VER)
1.214 djm 1317: fatal("%s: wrong version", __func__);
1.216 djm 1318: if (buffer_get_int(&m) != 1)
1319: fatal("Connection to master denied");
1.214 djm 1320: control_server_pid = buffer_get_int(&m);
1321:
1322: buffer_clear(&m);
1323:
1.229 djm 1324: switch (mux_command) {
1325: case SSHMUX_COMMAND_ALIVE_CHECK:
1.234 deraadt 1326: fprintf(stderr, "Master running (pid=%d)\r\n",
1.229 djm 1327: control_server_pid);
1328: exit(0);
1329: case SSHMUX_COMMAND_TERMINATE:
1330: fprintf(stderr, "Exit request sent.\r\n");
1331: exit(0);
1332: case SSHMUX_COMMAND_OPEN:
1333: /* continue below */
1334: break;
1335: default:
1336: fatal("silly mux_command %d", mux_command);
1337: }
1338:
1339: /* SSHMUX_COMMAND_OPEN */
1.247 djm 1340: buffer_put_cstring(&m, term ? term : "");
1.214 djm 1341: buffer_append(&command, "\0", 1);
1342: buffer_put_cstring(&m, buffer_ptr(&command));
1.215 djm 1343:
1.220 djm 1344: if (options.num_send_env == 0 || environ == NULL) {
1345: buffer_put_int(&m, 0);
1.223 deraadt 1346: } else {
1.220 djm 1347: /* Pass environment */
1348: num_env = 0;
1349: for (i = 0; environ[i] != NULL; i++)
1350: if (env_permitted(environ[i]))
1351: num_env++; /* Count */
1.223 deraadt 1352:
1.220 djm 1353: buffer_put_int(&m, num_env);
1354:
1.222 dtucker 1355: for (i = 0; environ[i] != NULL && num_env >= 0; i++)
1356: if (env_permitted(environ[i])) {
1357: num_env--;
1.220 djm 1358: buffer_put_cstring(&m, environ[i]);
1.222 dtucker 1359: }
1.220 djm 1360: }
1.214 djm 1361:
1.247 djm 1362: if (ssh_msg_send(sock, SSHMUX_VER, &m) == -1)
1.214 djm 1363: fatal("%s: msg_send", __func__);
1364:
1365: mm_send_fd(sock, STDIN_FILENO);
1366: mm_send_fd(sock, STDOUT_FILENO);
1367: mm_send_fd(sock, STDERR_FILENO);
1368:
1369: /* Wait for reply, so master has a chance to gather ttymodes */
1370: buffer_clear(&m);
1371: if (ssh_msg_recv(sock, &m) == -1)
1372: fatal("%s: msg_recv", __func__);
1.247 djm 1373: if (buffer_get_char(&m) != SSHMUX_VER)
1.229 djm 1374: fatal("%s: wrong version", __func__);
1.214 djm 1375: buffer_free(&m);
1.218 djm 1376:
1.226 djm 1377: signal(SIGHUP, control_client_sighandler);
1.218 djm 1378: signal(SIGINT, control_client_sighandler);
1379: signal(SIGTERM, control_client_sighandler);
1380: signal(SIGWINCH, control_client_sigrelay);
1.214 djm 1381:
1382: if (tty_flag)
1383: enter_raw_mode();
1384:
1385: /* Stick around until the controlee closes the client_fd */
1386: exitval = 0;
1387: for (;!control_client_terminate;) {
1388: r = read(sock, &exitval, sizeof(exitval));
1389: if (r == 0) {
1390: debug2("Received EOF from master");
1391: break;
1392: }
1393: if (r > 0)
1394: debug2("Received exit status from master %d", exitval);
1395: if (r == -1 && errno != EINTR)
1396: fatal("%s: read %s", __func__, strerror(errno));
1397: }
1398:
1399: if (control_client_terminate)
1400: debug2("Exiting on signal %d", control_client_terminate);
1401:
1402: close(sock);
1403:
1404: leave_raw_mode();
1405:
1406: if (tty_flag && options.log_level != SYSLOG_LEVEL_QUIET)
1407: fprintf(stderr, "Connection to master closed.\r\n");
1408:
1409: exit(exitval);
1.1 deraadt 1410: }
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