Annotation of src/usr.bin/ssh/ssh.c, Revision 1.240
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"
1.240 ! djm 43: RCSID("$OpenBSD: ssh.c,v 1.239 2005/05/10 10:30:43 djm 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"
1.233 jmc 161: " [-D port] [-e escape_char] [-F configfile]\n"
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"
1.230 jmc 165: " [user@]hostname [command]\n"
1.208 markus 166: );
1.31 markus 167: exit(1);
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;
1.232 djm 188: Forward fwd;
1.31 markus 189:
1.33 markus 190: /*
191: * Save the original real uid. It will be needed later (uid-swapping
192: * may clobber the real uid).
193: */
1.31 markus 194: original_real_uid = getuid();
195: original_effective_uid = geteuid();
196:
1.184 stevesk 197: /*
198: * Use uid-swapping to give up root privileges for the duration of
199: * option processing. We will re-instantiate the rights when we are
200: * ready to create the privileged port, and will permanently drop
201: * them when the port has been created (actually, when the connection
202: * has been made, as we may need to create the port several times).
203: */
204: PRIV_END;
205:
1.31 markus 206: /* If we are installed setuid root be careful to not drop core. */
207: if (original_real_uid != original_effective_uid) {
208: struct rlimit rlim;
209: rlim.rlim_cur = rlim.rlim_max = 0;
210: if (setrlimit(RLIMIT_CORE, &rlim) < 0)
211: fatal("setrlimit failed: %.100s", strerror(errno));
1.1 deraadt 212: }
1.107 markus 213: /* Get user data. */
214: pw = getpwuid(original_real_uid);
215: if (!pw) {
1.191 itojun 216: logit("You don't exist, go away!");
1.107 markus 217: exit(1);
218: }
219: /* Take a copy of the returned structure. */
220: pw = pwcopy(pw);
1.31 markus 221:
1.33 markus 222: /*
223: * Set our umask to something reasonable, as some files are created
224: * with the default umask. This will make them world-readable but
225: * writable only by the owner, which is ok for all files for which we
226: * don't set the modes explicitly.
227: */
1.31 markus 228: umask(022);
229:
230: /* Initialize option structure to indicate that no values have been set. */
231: initialize_options(&options);
232:
233: /* Parse command-line arguments. */
234: host = NULL;
235:
1.128 fgsch 236: again:
237: while ((opt = getopt(ac, av,
1.229 djm 238: "1246ab:c:e:fgi:kl:m:no:p:qstvxACD:F:I:L:MNO:PR:S:TVXY")) != -1) {
1.31 markus 239: switch (opt) {
1.91 jakob 240: case '1':
241: options.protocol = SSH_PROTO_1;
242: break;
1.47 markus 243: case '2':
244: options.protocol = SSH_PROTO_2;
245: break;
1.37 markus 246: case '4':
1.196 djm 247: options.address_family = AF_INET;
1.37 markus 248: break;
249: case '6':
1.196 djm 250: options.address_family = AF_INET6;
1.37 markus 251: break;
1.31 markus 252: case 'n':
253: stdin_null_flag = 1;
254: break;
255: case 'f':
256: fork_after_authentication_flag = 1;
257: stdin_null_flag = 1;
258: break;
259: case 'x':
260: options.forward_x11 = 0;
261: break;
262: case 'X':
263: options.forward_x11 = 1;
264: break;
1.202 markus 265: case 'Y':
266: options.forward_x11 = 1;
267: options.forward_x11_trusted = 1;
268: break;
1.31 markus 269: case 'g':
270: options.gateway_ports = 1;
271: break;
1.229 djm 272: case 'O':
273: if (strcmp(optarg, "check") == 0)
274: mux_command = SSHMUX_COMMAND_ALIVE_CHECK;
275: else if (strcmp(optarg, "exit") == 0)
276: mux_command = SSHMUX_COMMAND_TERMINATE;
277: else
278: fatal("Invalid multiplex command.");
279: break;
1.183 stevesk 280: case 'P': /* deprecated */
1.31 markus 281: options.use_privileged_port = 0;
282: break;
283: case 'a':
284: options.forward_agent = 0;
1.53 markus 285: break;
286: case 'A':
287: options.forward_agent = 1;
1.31 markus 288: break;
289: case 'k':
1.204 dtucker 290: options.gss_deleg_creds = 0;
1.31 markus 291: break;
292: case 'i':
293: if (stat(optarg, &st) < 0) {
1.128 fgsch 294: fprintf(stderr, "Warning: Identity file %s "
1.231 otto 295: "not accessible: %s.\n", optarg,
296: strerror(errno));
1.31 markus 297: break;
298: }
1.128 fgsch 299: if (options.num_identity_files >=
300: SSH_MAX_IDENTITY_FILES)
301: fatal("Too many identity files specified "
302: "(max %d)", SSH_MAX_IDENTITY_FILES);
303: options.identity_files[options.num_identity_files++] =
304: xstrdup(optarg);
1.31 markus 305: break;
1.127 markus 306: case 'I':
307: #ifdef SMARTCARD
1.133 markus 308: options.smartcard_device = xstrdup(optarg);
1.137 jakob 309: #else
1.127 markus 310: fprintf(stderr, "no support for smartcards.\n");
1.137 jakob 311: #endif
1.127 markus 312: break;
1.31 markus 313: case 't':
1.79 markus 314: if (tty_flag)
315: force_tty_flag = 1;
1.31 markus 316: tty_flag = 1;
317: break;
318: case 'v':
1.197 markus 319: if (debug_flag == 0) {
1.66 markus 320: debug_flag = 1;
321: options.log_level = SYSLOG_LEVEL_DEBUG1;
1.197 markus 322: } else {
323: if (options.log_level < SYSLOG_LEVEL_DEBUG3)
324: options.log_level++;
1.66 markus 325: break;
1.197 markus 326: }
1.227 deraadt 327: /* FALLTHROUGH */
1.31 markus 328: case 'V':
1.209 markus 329: fprintf(stderr, "%s, %s\n",
330: SSH_VERSION, SSLeay_version(SSLEAY_VERSION));
1.31 markus 331: if (opt == 'V')
332: exit(0);
333: break;
334: case 'q':
335: options.log_level = SYSLOG_LEVEL_QUIET;
336: break;
337: case 'e':
338: if (optarg[0] == '^' && optarg[2] == 0 &&
1.128 fgsch 339: (u_char) optarg[1] >= 64 &&
340: (u_char) optarg[1] < 128)
1.78 markus 341: options.escape_char = (u_char) optarg[1] & 31;
1.31 markus 342: else if (strlen(optarg) == 1)
1.78 markus 343: options.escape_char = (u_char) optarg[0];
1.31 markus 344: else if (strcmp(optarg, "none") == 0)
1.119 stevesk 345: options.escape_char = SSH_ESCAPECHAR_NONE;
1.31 markus 346: else {
1.128 fgsch 347: fprintf(stderr, "Bad escape character '%s'.\n",
348: optarg);
1.31 markus 349: exit(1);
350: }
351: break;
352: case 'c':
1.49 markus 353: if (ciphers_valid(optarg)) {
354: /* SSH2 only */
355: options.ciphers = xstrdup(optarg);
1.224 markus 356: options.cipher = SSH_CIPHER_INVALID;
1.49 markus 357: } else {
358: /* SSH1 only */
1.74 markus 359: options.cipher = cipher_number(optarg);
360: if (options.cipher == -1) {
1.128 fgsch 361: fprintf(stderr,
362: "Unknown cipher type '%s'\n",
363: optarg);
1.49 markus 364: exit(1);
365: }
1.128 fgsch 366: if (options.cipher == SSH_CIPHER_3DES)
1.74 markus 367: options.ciphers = "3des-cbc";
1.128 fgsch 368: else if (options.cipher == SSH_CIPHER_BLOWFISH)
1.74 markus 369: options.ciphers = "blowfish-cbc";
1.128 fgsch 370: else
1.74 markus 371: options.ciphers = (char *)-1;
1.95 markus 372: }
373: break;
374: case 'm':
375: if (mac_valid(optarg))
376: options.macs = xstrdup(optarg);
377: else {
1.128 fgsch 378: fprintf(stderr, "Unknown mac type '%s'\n",
379: optarg);
1.95 markus 380: exit(1);
1.31 markus 381: }
382: break;
1.214 djm 383: case 'M':
1.219 markus 384: options.control_master =
385: (options.control_master >= 1) ? 2 : 1;
1.214 djm 386: break;
1.31 markus 387: case 'p':
1.113 stevesk 388: options.port = a2port(optarg);
389: if (options.port == 0) {
1.109 markus 390: fprintf(stderr, "Bad port '%s'\n", optarg);
391: exit(1);
392: }
1.31 markus 393: break;
394: case 'l':
395: options.user = optarg;
396: break;
1.141 stevesk 397:
398: case 'L':
1.232 djm 399: if (parse_forward(&fwd, optarg))
400: add_local_forward(&options, &fwd);
401: else {
1.128 fgsch 402: fprintf(stderr,
1.232 djm 403: "Bad local forwarding specification '%s'\n",
1.128 fgsch 404: optarg);
1.232 djm 405: exit(1);
1.31 markus 406: }
1.232 djm 407: break;
408:
409: case 'R':
410: if (parse_forward(&fwd, optarg)) {
411: add_remote_forward(&options, &fwd);
412: } else {
1.128 fgsch 413: fprintf(stderr,
1.232 djm 414: "Bad remote forwarding specification "
415: "'%s'\n", optarg);
1.141 stevesk 416: exit(1);
1.31 markus 417: }
418: break;
1.108 markus 419:
420: case 'D':
1.232 djm 421: cp = p = xstrdup(optarg);
422: memset(&fwd, '\0', sizeof(fwd));
423: fwd.connect_host = "socks";
424: if ((fwd.listen_host = hpdelim(&cp)) == NULL) {
425: fprintf(stderr, "Bad dynamic forwarding "
426: "specification '%.100s'\n", optarg);
427: exit(1);
428: }
429: if (cp != NULL) {
430: fwd.listen_port = a2port(cp);
431: fwd.listen_host = cleanhostname(fwd.listen_host);
432: } else {
433: fwd.listen_port = a2port(fwd.listen_host);
434: fwd.listen_host = "";
435: }
436:
437: if (fwd.listen_port == 0) {
1.128 fgsch 438: fprintf(stderr, "Bad dynamic port '%s'\n",
439: optarg);
1.109 markus 440: exit(1);
441: }
1.232 djm 442: add_local_forward(&options, &fwd);
443: xfree(p);
1.108 markus 444: break;
445:
1.31 markus 446: case 'C':
447: options.compression = 1;
448: break;
1.45 markus 449: case 'N':
450: no_shell_flag = 1;
451: no_tty_flag = 1;
452: break;
453: case 'T':
454: no_tty_flag = 1;
455: break;
1.31 markus 456: case 'o':
457: dummy = 1;
1.205 markus 458: line = xstrdup(optarg);
1.128 fgsch 459: if (process_config_line(&options, host ? host : "",
1.205 markus 460: line, "command-line", 0, &dummy) != 0)
1.31 markus 461: exit(1);
1.205 markus 462: xfree(line);
1.31 markus 463: break;
1.85 djm 464: case 's':
465: subsystem_flag = 1;
1.117 markus 466: break;
1.214 djm 467: case 'S':
468: if (options.control_path != NULL)
469: free(options.control_path);
470: options.control_path = xstrdup(optarg);
471: break;
1.117 markus 472: case 'b':
473: options.bind_address = optarg;
1.85 djm 474: break;
1.139 markus 475: case 'F':
476: config = optarg;
477: break;
1.31 markus 478: default:
479: usage();
1.1 deraadt 480: }
1.31 markus 481: }
482:
1.128 fgsch 483: ac -= optind;
484: av += optind;
485:
486: if (ac > 0 && !host && **av != '-') {
1.188 markus 487: if (strrchr(*av, '@')) {
1.128 fgsch 488: p = xstrdup(*av);
1.188 markus 489: cp = strrchr(p, '@');
1.128 fgsch 490: if (cp == NULL || cp == p)
491: usage();
492: options.user = p;
493: *cp = '\0';
494: host = ++cp;
495: } else
496: host = *av;
1.189 millert 497: if (ac > 1) {
498: optind = optreset = 1;
1.128 fgsch 499: goto again;
500: }
1.189 millert 501: ac--, av++;
1.128 fgsch 502: }
503:
1.31 markus 504: /* Check that we got a host name. */
505: if (!host)
506: usage();
507:
1.54 markus 508: SSLeay_add_all_algorithms();
1.72 markus 509: ERR_load_crypto_strings();
1.31 markus 510:
511: /* Initialize the command to execute on remote host. */
512: buffer_init(&command);
1.1 deraadt 513:
1.33 markus 514: /*
515: * Save the command to execute on the remote host in a buffer. There
516: * is no limit on the length of the command, except by the maximum
517: * packet size. Also sets the tty flag if there is no command.
518: */
1.128 fgsch 519: if (!ac) {
1.31 markus 520: /* No command specified - execute shell on a tty. */
521: tty_flag = 1;
1.85 djm 522: if (subsystem_flag) {
1.128 fgsch 523: fprintf(stderr,
524: "You must specify a subsystem to invoke.\n");
1.85 djm 525: usage();
526: }
1.31 markus 527: } else {
1.128 fgsch 528: /* A command has been specified. Store it into the buffer. */
529: for (i = 0; i < ac; i++) {
530: if (i)
1.31 markus 531: buffer_append(&command, " ", 1);
532: buffer_append(&command, av[i], strlen(av[i]));
533: }
534: }
535:
536: /* Cannot fork to background if no command. */
1.63 markus 537: if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag)
1.31 markus 538: fatal("Cannot fork into background without a command to execute.");
539:
540: /* Allocate a tty by default if no command specified. */
541: if (buffer_len(&command) == 0)
542: tty_flag = 1;
543:
1.180 deraadt 544: /* Force no tty */
1.75 markus 545: if (no_tty_flag)
546: tty_flag = 0;
1.31 markus 547: /* Do not allocate a tty if stdin is not a tty. */
1.236 djm 548: if ((!isatty(fileno(stdin)) || stdin_null_flag) && !force_tty_flag) {
1.31 markus 549: if (tty_flag)
1.191 itojun 550: logit("Pseudo-terminal will not be allocated because stdin is not a terminal.");
1.31 markus 551: tty_flag = 0;
552: }
1.45 markus 553:
1.101 markus 554: /*
555: * Initialize "log" output. Since we are the client all output
556: * actually goes to stderr.
557: */
1.111 markus 558: log_init(av[0], options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level,
559: SYSLOG_FACILITY_USER, 1);
1.31 markus 560:
1.139 markus 561: /*
562: * Read per-user configuration file. Ignore the system wide config
563: * file if the user specifies a config file on the command line.
564: */
565: if (config != NULL) {
1.211 djm 566: if (!read_config_file(config, host, &options, 0))
1.142 stevesk 567: fatal("Can't open user config file %.100s: "
568: "%.100s", config, strerror(errno));
1.139 markus 569: } else {
570: snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir,
571: _PATH_SSH_USER_CONFFILE);
1.210 djm 572: (void)read_config_file(buf, host, &options, 1);
1.139 markus 573:
1.145 markus 574: /* Read systemwide configuration file after use config. */
1.223 deraadt 575: (void)read_config_file(_PATH_HOST_CONFIG_FILE, host,
1.210 djm 576: &options, 0);
1.139 markus 577: }
1.31 markus 578:
579: /* Fill configuration defaults. */
580: fill_default_options(&options);
581:
1.196 djm 582: channel_set_af(options.address_family);
583:
1.31 markus 584: /* reinit */
1.101 markus 585: log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 1);
1.31 markus 586:
587: if (options.user == NULL)
588: options.user = xstrdup(pw->pw_name);
589:
590: if (options.hostname != NULL)
591: host = options.hostname;
1.195 markus 592:
593: /* force lowercase for hostkey matching */
594: if (options.host_key_alias != NULL) {
595: for (p = options.host_key_alias; *p; p++)
596: if (isupper(*p))
597: *p = tolower(*p);
598: }
1.190 markus 599:
600: if (options.proxy_command != NULL &&
601: strcmp(options.proxy_command, "none") == 0)
602: options.proxy_command = NULL;
1.31 markus 603:
1.214 djm 604: if (options.control_path != NULL) {
605: options.control_path = tilde_expand_filename(
606: options.control_path, original_real_uid);
607: }
1.240 ! djm 608: if (mux_command != 0 && options.control_path == NULL)
! 609: fatal("No ControlPath specified for \"-O\" command");
! 610: if (options.control_path != NULL && options.control_master == 0) {
! 611: if (mux_command == 0)
! 612: mux_command = SSHMUX_COMMAND_OPEN;
1.237 jakob 613: control_client(options.control_path);
1.240 ! djm 614: }
1.214 djm 615:
1.77 markus 616: /* Open a connection to the remote host. */
1.203 djm 617: if (ssh_connect(host, &hostaddr, options.port,
1.196 djm 618: options.address_family, options.connection_attempts,
1.177 markus 619: original_effective_uid == 0 && options.use_privileged_port,
1.179 markus 620: options.proxy_command) != 0)
1.178 markus 621: exit(1);
1.31 markus 622:
1.33 markus 623: /*
624: * If we successfully made the connection, load the host private key
625: * in case we will need it later for combined rsa-rhosts
626: * authentication. This must be done before releasing extra
627: * privileges, because the file is only readable by root.
1.174 markus 628: * If we cannot access the private keys, load the public keys
629: * instead and try to execute the ssh-keysign helper instead.
1.33 markus 630: */
1.112 markus 631: sensitive_data.nkeys = 0;
632: sensitive_data.keys = NULL;
1.173 markus 633: sensitive_data.external_keysign = 0;
1.178 markus 634: if (options.rhosts_rsa_authentication ||
635: options.hostbased_authentication) {
1.112 markus 636: sensitive_data.nkeys = 3;
1.180 deraadt 637: sensitive_data.keys = xmalloc(sensitive_data.nkeys *
638: sizeof(Key));
1.177 markus 639:
640: PRIV_START;
1.112 markus 641: sensitive_data.keys[0] = key_load_private_type(KEY_RSA1,
1.105 markus 642: _PATH_HOST_KEY_FILE, "", NULL);
1.112 markus 643: sensitive_data.keys[1] = key_load_private_type(KEY_DSA,
644: _PATH_HOST_DSA_KEY_FILE, "", NULL);
645: sensitive_data.keys[2] = key_load_private_type(KEY_RSA,
646: _PATH_HOST_RSA_KEY_FILE, "", NULL);
1.177 markus 647: PRIV_END;
1.173 markus 648:
1.181 markus 649: if (options.hostbased_authentication == 1 &&
650: sensitive_data.keys[0] == NULL &&
1.173 markus 651: sensitive_data.keys[1] == NULL &&
652: sensitive_data.keys[2] == NULL) {
653: sensitive_data.keys[1] = key_load_public(
654: _PATH_HOST_DSA_KEY_FILE, NULL);
655: sensitive_data.keys[2] = key_load_public(
656: _PATH_HOST_RSA_KEY_FILE, NULL);
657: sensitive_data.external_keysign = 1;
658: }
1.31 markus 659: }
1.33 markus 660: /*
661: * Get rid of any extra privileges that we may have. We will no
662: * longer need them. Also, extra privileges could make it very hard
663: * to read identity files and other non-world-readable files from the
664: * user's home directory if it happens to be on a NFS volume where
665: * root is mapped to nobody.
666: */
1.225 dtucker 667: if (original_effective_uid == 0) {
668: PRIV_START;
669: permanently_set_uid(pw);
670: }
1.31 markus 671:
1.33 markus 672: /*
673: * Now that we are back to our own permissions, create ~/.ssh
674: * directory if it doesn\'t already exist.
675: */
1.138 jakob 676: snprintf(buf, sizeof buf, "%.100s%s%.100s", pw->pw_dir, strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR);
1.31 markus 677: if (stat(buf, &st) < 0)
1.57 djm 678: if (mkdir(buf, 0700) < 0)
1.31 markus 679: error("Could not create directory '%.200s'.", buf);
680:
1.104 markus 681: /* load options.identity_files */
682: load_public_identity_files();
683:
684: /* Expand ~ in known host file names. */
685: /* XXX mem-leaks: */
1.72 markus 686: options.system_hostfile =
687: tilde_expand_filename(options.system_hostfile, original_real_uid);
688: options.user_hostfile =
689: tilde_expand_filename(options.user_hostfile, original_real_uid);
690: options.system_hostfile2 =
691: tilde_expand_filename(options.system_hostfile2, original_real_uid);
692: options.user_hostfile2 =
693: tilde_expand_filename(options.user_hostfile2, original_real_uid);
1.149 markus 694:
695: signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
1.31 markus 696:
697: /* Log into the remote system. This never returns if the login fails. */
1.173 markus 698: ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr, pw);
1.31 markus 699:
1.112 markus 700: /* We no longer need the private host keys. Clear them now. */
701: if (sensitive_data.nkeys != 0) {
702: for (i = 0; i < sensitive_data.nkeys; i++) {
703: if (sensitive_data.keys[i] != NULL) {
704: /* Destroys contents safely */
705: debug3("clear hostkey %d", i);
706: key_free(sensitive_data.keys[i]);
707: sensitive_data.keys[i] = NULL;
708: }
709: }
710: xfree(sensitive_data.keys);
1.134 markus 711: }
712: for (i = 0; i < options.num_identity_files; i++) {
713: if (options.identity_files[i]) {
714: xfree(options.identity_files[i]);
715: options.identity_files[i] = NULL;
716: }
717: if (options.identity_keys[i]) {
718: key_free(options.identity_keys[i]);
719: options.identity_keys[i] = NULL;
720: }
1.112 markus 721: }
1.31 markus 722:
1.45 markus 723: exit_status = compat20 ? ssh_session2() : ssh_session();
724: packet_close();
1.186 djm 725:
1.214 djm 726: if (options.control_path != NULL && control_fd != -1)
727: unlink(options.control_path);
728:
1.186 djm 729: /*
1.203 djm 730: * Send SIGHUP to proxy command if used. We don't wait() in
1.186 djm 731: * case it hangs and instead rely on init to reap the child
732: */
733: if (proxy_command_pid > 1)
734: kill(proxy_command_pid, SIGHUP);
735:
1.45 markus 736: return exit_status;
737: }
738:
1.202 markus 739: #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
740:
1.126 itojun 741: static void
1.150 stevesk 742: x11_get_proto(char **_proto, char **_data)
1.50 markus 743: {
1.202 markus 744: char cmd[1024];
1.50 markus 745: char line[512];
1.202 markus 746: char xdisplay[512];
1.150 stevesk 747: static char proto[512], data[512];
1.50 markus 748: FILE *f;
1.202 markus 749: int got_data = 0, generated = 0, do_unlink = 0, i;
750: char *display, *xauthdir, *xauthfile;
1.182 stevesk 751: struct stat st;
1.50 markus 752:
1.202 markus 753: xauthdir = xauthfile = NULL;
1.150 stevesk 754: *_proto = proto;
755: *_data = data;
756: proto[0] = data[0] = '\0';
1.202 markus 757:
1.182 stevesk 758: if (!options.xauth_location ||
759: (stat(options.xauth_location, &st) == -1)) {
760: debug("No xauth program.");
761: } else {
762: if ((display = getenv("DISPLAY")) == NULL) {
763: debug("x11_get_proto: DISPLAY not set");
764: return;
765: }
1.202 markus 766: /*
767: * Handle FamilyLocal case where $DISPLAY does
768: * not match an authorization entry. For this we
769: * just try "xauth list unix:displaynum.screennum".
770: * XXX: "localhost" match to determine FamilyLocal
771: * is not perfect.
772: */
773: if (strncmp(display, "localhost:", 10) == 0) {
774: snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
775: display + 10);
776: display = xdisplay;
777: }
778: if (options.forward_x11_trusted == 0) {
779: xauthdir = xmalloc(MAXPATHLEN);
780: xauthfile = xmalloc(MAXPATHLEN);
781: strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN);
782: if (mkdtemp(xauthdir) != NULL) {
783: do_unlink = 1;
784: snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile",
785: xauthdir);
786: snprintf(cmd, sizeof(cmd),
787: "%s -f %s generate %s " SSH_X11_PROTO
1.207 markus 788: " untrusted timeout 1200 2>" _PATH_DEVNULL,
1.202 markus 789: options.xauth_location, xauthfile, display);
790: debug2("x11_get_proto: %s", cmd);
791: if (system(cmd) == 0)
792: generated = 1;
793: }
794: }
795: snprintf(cmd, sizeof(cmd),
796: "%s %s%s list %s . 2>" _PATH_DEVNULL,
797: options.xauth_location,
798: generated ? "-f " : "" ,
799: generated ? xauthfile : "",
800: display);
801: debug2("x11_get_proto: %s", cmd);
802: f = popen(cmd, "r");
1.55 markus 803: if (f && fgets(line, sizeof(line), f) &&
1.150 stevesk 804: sscanf(line, "%*s %511s %511s", proto, data) == 2)
1.55 markus 805: got_data = 1;
806: if (f)
807: pclose(f);
808: }
1.202 markus 809:
810: if (do_unlink) {
811: unlink(xauthfile);
812: rmdir(xauthdir);
813: }
814: if (xauthdir)
815: xfree(xauthdir);
816: if (xauthfile)
817: xfree(xauthfile);
818:
1.50 markus 819: /*
820: * If we didn't get authentication data, just make up some
821: * data. The forwarding code will check the validity of the
822: * response anyway, and substitute this data. The X11
823: * server, however, will ignore this fake data and use
824: * whatever authentication mechanisms it was using otherwise
825: * for the local connection.
826: */
827: if (!got_data) {
1.221 avsm 828: u_int32_t rnd = 0;
1.50 markus 829:
1.202 markus 830: logit("Warning: No xauth data; "
831: "using fake authentication data for X11 forwarding.");
832: strlcpy(proto, SSH_X11_PROTO, sizeof proto);
1.50 markus 833: for (i = 0; i < 16; i++) {
834: if (i % 4 == 0)
1.221 avsm 835: rnd = arc4random();
1.202 markus 836: snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
1.221 avsm 837: rnd & 0xff);
838: rnd >>= 8;
1.50 markus 839: }
840: }
841: }
842:
1.126 itojun 843: static void
1.70 markus 844: ssh_init_forwarding(void)
845: {
1.86 markus 846: int success = 0;
1.70 markus 847: int i;
1.86 markus 848:
1.70 markus 849: /* Initiate local TCP/IP port forwardings. */
850: for (i = 0; i < options.num_local_forwards; i++) {
1.232 djm 851: debug("Local connections to %.200s:%d forwarded to remote "
852: "address %.200s:%d",
1.234 deraadt 853: (options.local_forwards[i].listen_host == NULL) ?
854: (options.gateway_ports ? "*" : "LOCALHOST") :
1.232 djm 855: options.local_forwards[i].listen_host,
856: options.local_forwards[i].listen_port,
857: options.local_forwards[i].connect_host,
858: options.local_forwards[i].connect_port);
1.158 markus 859: success += channel_setup_local_fwd_listener(
1.232 djm 860: options.local_forwards[i].listen_host,
861: options.local_forwards[i].listen_port,
862: options.local_forwards[i].connect_host,
863: options.local_forwards[i].connect_port,
1.70 markus 864: options.gateway_ports);
865: }
1.86 markus 866: if (i > 0 && success == 0)
867: error("Could not request local forwarding.");
1.70 markus 868:
869: /* Initiate remote TCP/IP port forwardings. */
870: for (i = 0; i < options.num_remote_forwards; i++) {
1.232 djm 871: debug("Remote connections from %.200s:%d forwarded to "
872: "local address %.200s:%d",
1.235 dtucker 873: (options.remote_forwards[i].listen_host == NULL) ?
874: (options.gateway_ports ? "*" : "LOCALHOST") :
1.232 djm 875: options.remote_forwards[i].listen_host,
876: options.remote_forwards[i].listen_port,
877: options.remote_forwards[i].connect_host,
878: options.remote_forwards[i].connect_port);
1.70 markus 879: channel_request_remote_forwarding(
1.232 djm 880: options.remote_forwards[i].listen_host,
881: options.remote_forwards[i].listen_port,
882: options.remote_forwards[i].connect_host,
883: options.remote_forwards[i].connect_port);
1.70 markus 884: }
885: }
886:
1.126 itojun 887: static void
1.70 markus 888: check_agent_present(void)
889: {
890: if (options.forward_agent) {
891: /* Clear agent forwarding if we don\'t have an agent. */
1.185 stevesk 892: if (!ssh_agent_present())
1.70 markus 893: options.forward_agent = 0;
894: }
895: }
896:
1.126 itojun 897: static int
1.45 markus 898: ssh_session(void)
899: {
900: int type;
901: int interactive = 0;
902: int have_tty = 0;
903: struct winsize ws;
904: char *cp;
905:
1.31 markus 906: /* Enable compression if requested. */
907: if (options.compression) {
908: debug("Requesting compression at level %d.", options.compression_level);
909:
910: if (options.compression_level < 1 || options.compression_level > 9)
911: fatal("Compression level must be from 1 (fast) to 9 (slow, best).");
912:
913: /* Send the request. */
914: packet_start(SSH_CMSG_REQUEST_COMPRESSION);
915: packet_put_int(options.compression_level);
916: packet_send();
917: packet_write_wait();
1.156 markus 918: type = packet_read();
1.31 markus 919: if (type == SSH_SMSG_SUCCESS)
920: packet_start_compression(options.compression_level);
921: else if (type == SSH_SMSG_FAILURE)
1.191 itojun 922: logit("Warning: Remote host refused compression.");
1.31 markus 923: else
924: packet_disconnect("Protocol error waiting for compression response.");
925: }
926: /* Allocate a pseudo tty if appropriate. */
927: if (tty_flag) {
928: debug("Requesting pty.");
929:
930: /* Start the packet. */
931: packet_start(SSH_CMSG_REQUEST_PTY);
932:
933: /* Store TERM in the packet. There is no limit on the
934: length of the string. */
935: cp = getenv("TERM");
936: if (!cp)
937: cp = "";
1.124 markus 938: packet_put_cstring(cp);
1.31 markus 939:
940: /* Store window size in the packet. */
941: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
942: memset(&ws, 0, sizeof(ws));
943: packet_put_int(ws.ws_row);
944: packet_put_int(ws.ws_col);
945: packet_put_int(ws.ws_xpixel);
946: packet_put_int(ws.ws_ypixel);
947:
948: /* Store tty modes in the packet. */
1.115 stevesk 949: tty_make_modes(fileno(stdin), NULL);
1.31 markus 950:
951: /* Send the packet, and wait for it to leave. */
952: packet_send();
953: packet_write_wait();
954:
955: /* Read response from the server. */
1.156 markus 956: type = packet_read();
1.43 markus 957: if (type == SSH_SMSG_SUCCESS) {
1.31 markus 958: interactive = 1;
1.45 markus 959: have_tty = 1;
1.43 markus 960: } else if (type == SSH_SMSG_FAILURE)
1.191 itojun 961: logit("Warning: Remote host failed or refused to allocate a pseudo tty.");
1.31 markus 962: else
963: packet_disconnect("Protocol error waiting for pty request response.");
964: }
965: /* Request X11 forwarding if enabled and DISPLAY is set. */
966: if (options.forward_x11 && getenv("DISPLAY") != NULL) {
1.150 stevesk 967: char *proto, *data;
1.50 markus 968: /* Get reasonable local authentication information. */
1.150 stevesk 969: x11_get_proto(&proto, &data);
1.50 markus 970: /* Request forwarding with authentication spoofing. */
1.31 markus 971: debug("Requesting X11 forwarding with authentication spoofing.");
1.50 markus 972: x11_request_forwarding_with_spoofing(0, proto, data);
1.31 markus 973:
974: /* Read response from the server. */
1.156 markus 975: type = packet_read();
1.31 markus 976: if (type == SSH_SMSG_SUCCESS) {
977: interactive = 1;
1.50 markus 978: } else if (type == SSH_SMSG_FAILURE) {
1.191 itojun 979: logit("Warning: Remote host denied X11 forwarding.");
1.50 markus 980: } else {
1.31 markus 981: packet_disconnect("Protocol error waiting for X11 forwarding");
1.50 markus 982: }
1.31 markus 983: }
984: /* Tell the packet module whether this is an interactive session. */
1.80 markus 985: packet_set_interactive(interactive);
1.31 markus 986:
987: /* Request authentication agent forwarding if appropriate. */
1.70 markus 988: check_agent_present();
989:
1.31 markus 990: if (options.forward_agent) {
991: debug("Requesting authentication agent forwarding.");
992: auth_request_forwarding();
993:
994: /* Read response from the server. */
1.156 markus 995: type = packet_read();
1.155 markus 996: packet_check_eom();
1.31 markus 997: if (type != SSH_SMSG_SUCCESS)
1.191 itojun 998: logit("Warning: Remote host denied authentication agent forwarding.");
1.31 markus 999: }
1000:
1.70 markus 1001: /* Initiate port forwardings. */
1002: ssh_init_forwarding();
1.34 markus 1003:
1004: /* If requested, let ssh continue in the background. */
1.48 markus 1005: if (fork_after_authentication_flag)
1.34 markus 1006: if (daemon(1, 1) < 0)
1007: fatal("daemon() failed: %.200s", strerror(errno));
1.31 markus 1008:
1.33 markus 1009: /*
1010: * If a command was specified on the command line, execute the
1011: * command now. Otherwise request the server to start a shell.
1012: */
1.31 markus 1013: if (buffer_len(&command) > 0) {
1014: int len = buffer_len(&command);
1015: if (len > 900)
1016: len = 900;
1.152 stevesk 1017: debug("Sending command: %.*s", len, (u_char *)buffer_ptr(&command));
1.31 markus 1018: packet_start(SSH_CMSG_EXEC_CMD);
1019: packet_put_string(buffer_ptr(&command), buffer_len(&command));
1020: packet_send();
1021: packet_write_wait();
1022: } else {
1023: debug("Requesting shell.");
1024: packet_start(SSH_CMSG_EXEC_SHELL);
1025: packet_send();
1026: packet_write_wait();
1027: }
1028:
1029: /* Enter the interactive session. */
1.119 stevesk 1030: return client_loop(have_tty, tty_flag ?
1031: options.escape_char : SSH_ESCAPECHAR_NONE, 0);
1.45 markus 1032: }
1033:
1.126 itojun 1034: static void
1.214 djm 1035: ssh_subsystem_reply(int type, u_int32_t seq, void *ctxt)
1.89 markus 1036: {
1037: int id, len;
1038:
1039: id = packet_get_int();
1040: len = buffer_len(&command);
1.100 markus 1041: if (len > 900)
1042: len = 900;
1.155 markus 1043: packet_check_eom();
1.89 markus 1044: if (type == SSH2_MSG_CHANNEL_FAILURE)
1045: fatal("Request for subsystem '%.*s' failed on channel %d",
1.152 stevesk 1046: len, (u_char *)buffer_ptr(&command), id);
1.170 markus 1047: }
1048:
1049: void
1.206 markus 1050: client_global_request_reply_fwd(int type, u_int32_t seq, void *ctxt)
1.170 markus 1051: {
1052: int i;
1053:
1054: i = client_global_request_id++;
1.206 markus 1055: if (i >= options.num_remote_forwards)
1.170 markus 1056: return;
1057: debug("remote forward %s for: listen %d, connect %s:%d",
1058: type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
1.232 djm 1059: options.remote_forwards[i].listen_port,
1060: options.remote_forwards[i].connect_host,
1061: options.remote_forwards[i].connect_port);
1.170 markus 1062: if (type == SSH2_MSG_REQUEST_FAILURE)
1.232 djm 1063: logit("Warning: remote port forwarding failed for listen "
1064: "port %d", options.remote_forwards[i].listen_port);
1.89 markus 1065: }
1066:
1.126 itojun 1067: static void
1.214 djm 1068: ssh_control_listener(void)
1.45 markus 1069: {
1.214 djm 1070: struct sockaddr_un addr;
1071: mode_t old_umask;
1.223 deraadt 1072:
1.216 djm 1073: if (options.control_path == NULL || options.control_master <= 0)
1.214 djm 1074: return;
1075:
1076: memset(&addr, '\0', sizeof(addr));
1077: addr.sun_family = AF_UNIX;
1078: addr.sun_len = offsetof(struct sockaddr_un, sun_path) +
1079: strlen(options.control_path) + 1;
1080:
1081: if (strlcpy(addr.sun_path, options.control_path,
1082: sizeof(addr.sun_path)) >= sizeof(addr.sun_path))
1083: fatal("ControlPath too long");
1084:
1085: if ((control_fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0)
1086: fatal("%s socket(): %s\n", __func__, strerror(errno));
1087:
1088: old_umask = umask(0177);
1089: if (bind(control_fd, (struct sockaddr*)&addr, addr.sun_len) == -1) {
1090: control_fd = -1;
1.238 djm 1091: if (errno == EINVAL || errno == EADDRINUSE)
1.214 djm 1092: fatal("ControlSocket %s already exists",
1093: options.control_path);
1094: else
1095: fatal("%s bind(): %s\n", __func__, strerror(errno));
1096: }
1097: umask(old_umask);
1.80 markus 1098:
1.214 djm 1099: if (listen(control_fd, 64) == -1)
1100: fatal("%s listen(): %s\n", __func__, strerror(errno));
1.31 markus 1101:
1.214 djm 1102: set_nonblock(control_fd);
1103: }
1.45 markus 1104:
1.214 djm 1105: /* request pty/x11/agent/tcpfwd/shell for channel */
1106: static void
1107: ssh_session2_setup(int id, void *arg)
1108: {
1.215 djm 1109: extern char **environ;
1110:
1.214 djm 1111: int interactive = tty_flag;
1112: if (options.forward_x11 && getenv("DISPLAY") != NULL) {
1.150 stevesk 1113: char *proto, *data;
1.50 markus 1114: /* Get reasonable local authentication information. */
1.150 stevesk 1115: x11_get_proto(&proto, &data);
1.50 markus 1116: /* Request forwarding with authentication spoofing. */
1117: debug("Requesting X11 forwarding with authentication spoofing.");
1118: x11_request_forwarding_with_spoofing(id, proto, data);
1.80 markus 1119: interactive = 1;
1.50 markus 1120: /* XXX wait for reply */
1121: }
1122:
1.70 markus 1123: check_agent_present();
1124: if (options.forward_agent) {
1125: debug("Requesting authentication agent forwarding.");
1126: channel_request_start(id, "auth-agent-req@openssh.com", 0);
1127: packet_send();
1.212 djm 1128: }
1129:
1.214 djm 1130: client_session2_setup(id, tty_flag, subsystem_flag, getenv("TERM"),
1.215 djm 1131: NULL, fileno(stdin), &command, environ, &ssh_subsystem_reply);
1.90 markus 1132:
1.80 markus 1133: packet_set_interactive(interactive);
1.45 markus 1134: }
1135:
1.143 markus 1136: /* open new channel for a session */
1.126 itojun 1137: static int
1.143 markus 1138: ssh_session2_open(void)
1.45 markus 1139: {
1.118 markus 1140: Channel *c;
1141: int window, packetmax, in, out, err;
1.60 markus 1142:
1.62 markus 1143: if (stdin_null_flag) {
1.93 itojun 1144: in = open(_PATH_DEVNULL, O_RDONLY);
1.62 markus 1145: } else {
1146: in = dup(STDIN_FILENO);
1147: }
1.60 markus 1148: out = dup(STDOUT_FILENO);
1149: err = dup(STDERR_FILENO);
1.45 markus 1150:
1151: if (in < 0 || out < 0 || err < 0)
1.62 markus 1152: fatal("dup() in/out/err failed");
1.45 markus 1153:
1.69 markus 1154: /* enable nonblocking unless tty */
1155: if (!isatty(in))
1156: set_nonblock(in);
1157: if (!isatty(out))
1158: set_nonblock(out);
1159: if (!isatty(err))
1160: set_nonblock(err);
1161:
1.65 markus 1162: window = CHAN_SES_WINDOW_DEFAULT;
1163: packetmax = CHAN_SES_PACKET_DEFAULT;
1.164 markus 1164: if (tty_flag) {
1165: window >>= 1;
1166: packetmax >>= 1;
1.45 markus 1167: }
1.118 markus 1168: c = channel_new(
1.45 markus 1169: "session", SSH_CHANNEL_OPENING, in, out, err,
1.65 markus 1170: window, packetmax, CHAN_EXTENDED_WRITE,
1.192 markus 1171: "client-session", /*nonblock*/0);
1.45 markus 1172:
1.143 markus 1173: debug3("ssh_session2_open: channel_new: %d", c->self);
1.106 markus 1174:
1.122 markus 1175: channel_send_open(c->self);
1.143 markus 1176: if (!no_shell_flag)
1.214 djm 1177: channel_register_confirm(c->self, ssh_session2_setup, NULL);
1.106 markus 1178:
1.118 markus 1179: return c->self;
1.106 markus 1180: }
1181:
1.126 itojun 1182: static int
1.106 markus 1183: ssh_session2(void)
1184: {
1.143 markus 1185: int id = -1;
1.106 markus 1186:
1187: /* XXX should be pre-session */
1188: ssh_init_forwarding();
1.214 djm 1189: ssh_control_listener();
1.106 markus 1190:
1.143 markus 1191: if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN))
1192: id = ssh_session2_open();
1.106 markus 1193:
1194: /* If requested, let ssh continue in the background. */
1195: if (fork_after_authentication_flag)
1196: if (daemon(1, 1) < 0)
1197: fatal("daemon() failed: %.200s", strerror(errno));
1.31 markus 1198:
1.119 stevesk 1199: return client_loop(tty_flag, tty_flag ?
1200: options.escape_char : SSH_ESCAPECHAR_NONE, id);
1.72 markus 1201: }
1202:
1.126 itojun 1203: static void
1.104 markus 1204: load_public_identity_files(void)
1205: {
1206: char *filename;
1.167 markus 1207: int i = 0;
1.104 markus 1208: Key *public;
1.167 markus 1209: #ifdef SMARTCARD
1210: Key **keys;
1.104 markus 1211:
1.133 markus 1212: if (options.smartcard_device != NULL &&
1.167 markus 1213: options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
1214: (keys = sc_get_keys(options.smartcard_device, NULL)) != NULL ) {
1215: int count = 0;
1216: for (i = 0; keys[i] != NULL; i++) {
1217: count++;
1218: memmove(&options.identity_files[1], &options.identity_files[0],
1219: sizeof(char *) * (SSH_MAX_IDENTITY_FILES - 1));
1220: memmove(&options.identity_keys[1], &options.identity_keys[0],
1221: sizeof(Key *) * (SSH_MAX_IDENTITY_FILES - 1));
1222: options.num_identity_files++;
1223: options.identity_keys[0] = keys[i];
1.194 markus 1224: options.identity_files[0] = sc_get_key_label(keys[i]);
1.167 markus 1225: }
1.168 markus 1226: if (options.num_identity_files > SSH_MAX_IDENTITY_FILES)
1227: options.num_identity_files = SSH_MAX_IDENTITY_FILES;
1.167 markus 1228: i = count;
1229: xfree(keys);
1.127 markus 1230: }
1.136 jakob 1231: #endif /* SMARTCARD */
1.131 millert 1232: for (; i < options.num_identity_files; i++) {
1233: filename = tilde_expand_filename(options.identity_files[i],
1234: original_real_uid);
1235: public = key_load_public(filename, NULL);
1236: debug("identity file %s type %d", filename,
1237: public ? public->type : -1);
1238: xfree(options.identity_files[i]);
1239: options.identity_files[i] = filename;
1240: options.identity_keys[i] = public;
1241: }
1.214 djm 1242: }
1243:
1244: static void
1245: control_client_sighandler(int signo)
1246: {
1247: control_client_terminate = signo;
1248: }
1249:
1250: static void
1251: control_client_sigrelay(int signo)
1252: {
1253: if (control_server_pid > 1)
1254: kill(control_server_pid, signo);
1255: }
1256:
1.220 djm 1257: static int
1258: env_permitted(char *env)
1259: {
1260: int i;
1261: char name[1024], *cp;
1262:
1263: strlcpy(name, env, sizeof(name));
1264: if ((cp = strchr(name, '=')) == NULL)
1265: return (0);
1266:
1267: *cp = '\0';
1268:
1269: for (i = 0; i < options.num_send_env; i++)
1270: if (match_pattern(name, options.send_env[i]))
1271: return (1);
1272:
1273: return (0);
1274: }
1275:
1.214 djm 1276: static void
1277: control_client(const char *path)
1278: {
1279: struct sockaddr_un addr;
1.228 djm 1280: int i, r, fd, sock, exitval, num_env;
1.214 djm 1281: Buffer m;
1.229 djm 1282: char *term;
1.215 djm 1283: extern char **environ;
1.229 djm 1284: u_int flags;
1.228 djm 1285:
1.214 djm 1286: memset(&addr, '\0', sizeof(addr));
1287: addr.sun_family = AF_UNIX;
1288: addr.sun_len = offsetof(struct sockaddr_un, sun_path) +
1289: strlen(path) + 1;
1290:
1291: if (strlcpy(addr.sun_path, path,
1292: sizeof(addr.sun_path)) >= sizeof(addr.sun_path))
1293: fatal("ControlPath too long");
1294:
1295: if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) < 0)
1296: fatal("%s socket(): %s", __func__, strerror(errno));
1297:
1.237 jakob 1298: if (connect(sock, (struct sockaddr*)&addr, addr.sun_len) == -1) {
1.240 ! djm 1299: if (mux_command != SSHMUX_COMMAND_OPEN) {
! 1300: fatal("Control socket connect(%.100s): %s", path,
! 1301: strerror(errno));
! 1302: }
1.239 djm 1303: if (errno == ENOENT)
1304: debug("Control socket \"%.100s\" does not exist", path);
1305: else {
1306: error("Control socket connect(%.100s): %s", path,
1307: strerror(errno));
1308: }
1.237 jakob 1309: close(sock);
1310: return;
1311: }
1312:
1313: if (stdin_null_flag) {
1314: if ((fd = open(_PATH_DEVNULL, O_RDONLY)) == -1)
1315: fatal("open(/dev/null): %s", strerror(errno));
1316: if (dup2(fd, STDIN_FILENO) == -1)
1317: fatal("dup2: %s", strerror(errno));
1318: if (fd > STDERR_FILENO)
1319: close(fd);
1320: }
1321:
1.229 djm 1322: if ((term = getenv("TERM")) == NULL)
1323: term = "";
1324:
1325: flags = 0;
1326: if (tty_flag)
1327: flags |= SSHMUX_FLAG_TTY;
1328: if (subsystem_flag)
1329: flags |= SSHMUX_FLAG_SUBSYS;
1.214 djm 1330:
1331: buffer_init(&m);
1332:
1.229 djm 1333: /* Send our command to server */
1334: buffer_put_int(&m, mux_command);
1335: buffer_put_int(&m, flags);
1336: if (ssh_msg_send(sock, /* version */1, &m) == -1)
1337: fatal("%s: msg_send", __func__);
1338: buffer_clear(&m);
1339:
1340: /* Get authorisation status and PID of controlee */
1.214 djm 1341: if (ssh_msg_recv(sock, &m) == -1)
1342: fatal("%s: msg_recv", __func__);
1.229 djm 1343: if (buffer_get_char(&m) != 1)
1.214 djm 1344: fatal("%s: wrong version", __func__);
1.216 djm 1345: if (buffer_get_int(&m) != 1)
1346: fatal("Connection to master denied");
1.214 djm 1347: control_server_pid = buffer_get_int(&m);
1348:
1349: buffer_clear(&m);
1350:
1.229 djm 1351: switch (mux_command) {
1352: case SSHMUX_COMMAND_ALIVE_CHECK:
1.234 deraadt 1353: fprintf(stderr, "Master running (pid=%d)\r\n",
1.229 djm 1354: control_server_pid);
1355: exit(0);
1356: case SSHMUX_COMMAND_TERMINATE:
1357: fprintf(stderr, "Exit request sent.\r\n");
1358: exit(0);
1359: case SSHMUX_COMMAND_OPEN:
1360: /* continue below */
1361: break;
1362: default:
1363: fatal("silly mux_command %d", mux_command);
1364: }
1365:
1366: /* SSHMUX_COMMAND_OPEN */
1367: buffer_put_cstring(&m, term);
1.214 djm 1368: buffer_append(&command, "\0", 1);
1369: buffer_put_cstring(&m, buffer_ptr(&command));
1.215 djm 1370:
1.220 djm 1371: if (options.num_send_env == 0 || environ == NULL) {
1372: buffer_put_int(&m, 0);
1.223 deraadt 1373: } else {
1.220 djm 1374: /* Pass environment */
1375: num_env = 0;
1376: for (i = 0; environ[i] != NULL; i++)
1377: if (env_permitted(environ[i]))
1378: num_env++; /* Count */
1.223 deraadt 1379:
1.220 djm 1380: buffer_put_int(&m, num_env);
1381:
1.222 dtucker 1382: for (i = 0; environ[i] != NULL && num_env >= 0; i++)
1383: if (env_permitted(environ[i])) {
1384: num_env--;
1.220 djm 1385: buffer_put_cstring(&m, environ[i]);
1.222 dtucker 1386: }
1.220 djm 1387: }
1.214 djm 1388:
1.229 djm 1389: if (ssh_msg_send(sock, /* version */1, &m) == -1)
1.214 djm 1390: fatal("%s: msg_send", __func__);
1391:
1392: mm_send_fd(sock, STDIN_FILENO);
1393: mm_send_fd(sock, STDOUT_FILENO);
1394: mm_send_fd(sock, STDERR_FILENO);
1395:
1396: /* Wait for reply, so master has a chance to gather ttymodes */
1397: buffer_clear(&m);
1398: if (ssh_msg_recv(sock, &m) == -1)
1399: fatal("%s: msg_recv", __func__);
1.229 djm 1400: if (buffer_get_char(&m) != 1)
1401: fatal("%s: wrong version", __func__);
1.214 djm 1402: buffer_free(&m);
1.218 djm 1403:
1.226 djm 1404: signal(SIGHUP, control_client_sighandler);
1.218 djm 1405: signal(SIGINT, control_client_sighandler);
1406: signal(SIGTERM, control_client_sighandler);
1407: signal(SIGWINCH, control_client_sigrelay);
1.214 djm 1408:
1409: if (tty_flag)
1410: enter_raw_mode();
1411:
1412: /* Stick around until the controlee closes the client_fd */
1413: exitval = 0;
1414: for (;!control_client_terminate;) {
1415: r = read(sock, &exitval, sizeof(exitval));
1416: if (r == 0) {
1417: debug2("Received EOF from master");
1418: break;
1419: }
1420: if (r > 0)
1421: debug2("Received exit status from master %d", exitval);
1422: if (r == -1 && errno != EINTR)
1423: fatal("%s: read %s", __func__, strerror(errno));
1424: }
1425:
1426: if (control_client_terminate)
1427: debug2("Exiting on signal %d", control_client_terminate);
1428:
1429: close(sock);
1430:
1431: leave_raw_mode();
1432:
1433: if (tty_flag && options.log_level != SYSLOG_LEVEL_QUIET)
1434: fprintf(stderr, "Connection to master closed.\r\n");
1435:
1436: exit(exitval);
1.1 deraadt 1437: }
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