Annotation of src/usr.bin/ssh/ssh.c, Revision 1.230
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"
1.230 ! jmc 43: RCSID("$OpenBSD: ssh.c,v 1.229 2004/11/07 00:01:46 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 */
148: static u_int mux_command = SSHMUX_COMMAND_OPEN;
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"
1.208 markus 161: " [-D port] [-e escape_char] [-F configfile] [-i identity_file]\n"
1.230 ! jmc 162: " [-L port:host:hostport] [-l login_name] [-m mac_spec] [-O ctl_cmd]\n"
! 163: " [-o option] [-p port] [-R port:host:hostport] [-S ctl_path]\n"
! 164: " [user@]hostname [command]\n"
1.208 markus 165: );
1.31 markus 166: exit(1);
1.1 deraadt 167: }
168:
1.126 itojun 169: static int ssh_session(void);
170: static int ssh_session2(void);
171: static void load_public_identity_files(void);
1.214 djm 172: static void control_client(const char *path);
1.45 markus 173:
1.32 deraadt 174: /*
175: * Main program for the ssh client.
176: */
1.2 provos 177: int
178: main(int ac, char **av)
1.1 deraadt 179: {
1.178 markus 180: int i, opt, exit_status;
1.35 markus 181: u_short fwd_port, fwd_host_port;
1.141 stevesk 182: char sfwd_port[6], sfwd_host_port[6];
1.205 markus 183: char *p, *cp, *line, buf[256];
1.31 markus 184: struct stat st;
1.98 markus 185: struct passwd *pw;
1.45 markus 186: int dummy;
1.144 stevesk 187: extern int optind, optreset;
188: extern char *optarg;
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 "
295: "does not exist.\n", optarg);
1.31 markus 296: break;
297: }
1.128 fgsch 298: if (options.num_identity_files >=
299: SSH_MAX_IDENTITY_FILES)
300: fatal("Too many identity files specified "
301: "(max %d)", SSH_MAX_IDENTITY_FILES);
302: options.identity_files[options.num_identity_files++] =
303: xstrdup(optarg);
1.31 markus 304: break;
1.127 markus 305: case 'I':
306: #ifdef SMARTCARD
1.133 markus 307: options.smartcard_device = xstrdup(optarg);
1.137 jakob 308: #else
1.127 markus 309: fprintf(stderr, "no support for smartcards.\n");
1.137 jakob 310: #endif
1.127 markus 311: break;
1.31 markus 312: case 't':
1.79 markus 313: if (tty_flag)
314: force_tty_flag = 1;
1.31 markus 315: tty_flag = 1;
316: break;
317: case 'v':
1.197 markus 318: if (debug_flag == 0) {
1.66 markus 319: debug_flag = 1;
320: options.log_level = SYSLOG_LEVEL_DEBUG1;
1.197 markus 321: } else {
322: if (options.log_level < SYSLOG_LEVEL_DEBUG3)
323: options.log_level++;
1.66 markus 324: break;
1.197 markus 325: }
1.227 deraadt 326: /* FALLTHROUGH */
1.31 markus 327: case 'V':
1.209 markus 328: fprintf(stderr, "%s, %s\n",
329: SSH_VERSION, SSLeay_version(SSLEAY_VERSION));
1.31 markus 330: if (opt == 'V')
331: exit(0);
332: break;
333: case 'q':
334: options.log_level = SYSLOG_LEVEL_QUIET;
335: break;
336: case 'e':
337: if (optarg[0] == '^' && optarg[2] == 0 &&
1.128 fgsch 338: (u_char) optarg[1] >= 64 &&
339: (u_char) optarg[1] < 128)
1.78 markus 340: options.escape_char = (u_char) optarg[1] & 31;
1.31 markus 341: else if (strlen(optarg) == 1)
1.78 markus 342: options.escape_char = (u_char) optarg[0];
1.31 markus 343: else if (strcmp(optarg, "none") == 0)
1.119 stevesk 344: options.escape_char = SSH_ESCAPECHAR_NONE;
1.31 markus 345: else {
1.128 fgsch 346: fprintf(stderr, "Bad escape character '%s'.\n",
347: optarg);
1.31 markus 348: exit(1);
349: }
350: break;
351: case 'c':
1.49 markus 352: if (ciphers_valid(optarg)) {
353: /* SSH2 only */
354: options.ciphers = xstrdup(optarg);
1.224 markus 355: options.cipher = SSH_CIPHER_INVALID;
1.49 markus 356: } else {
357: /* SSH1 only */
1.74 markus 358: options.cipher = cipher_number(optarg);
359: if (options.cipher == -1) {
1.128 fgsch 360: fprintf(stderr,
361: "Unknown cipher type '%s'\n",
362: optarg);
1.49 markus 363: exit(1);
364: }
1.128 fgsch 365: if (options.cipher == SSH_CIPHER_3DES)
1.74 markus 366: options.ciphers = "3des-cbc";
1.128 fgsch 367: else if (options.cipher == SSH_CIPHER_BLOWFISH)
1.74 markus 368: options.ciphers = "blowfish-cbc";
1.128 fgsch 369: else
1.74 markus 370: options.ciphers = (char *)-1;
1.95 markus 371: }
372: break;
373: case 'm':
374: if (mac_valid(optarg))
375: options.macs = xstrdup(optarg);
376: else {
1.128 fgsch 377: fprintf(stderr, "Unknown mac type '%s'\n",
378: optarg);
1.95 markus 379: exit(1);
1.31 markus 380: }
381: break;
1.214 djm 382: case 'M':
1.219 markus 383: options.control_master =
384: (options.control_master >= 1) ? 2 : 1;
1.214 djm 385: break;
1.31 markus 386: case 'p':
1.113 stevesk 387: options.port = a2port(optarg);
388: if (options.port == 0) {
1.109 markus 389: fprintf(stderr, "Bad port '%s'\n", optarg);
390: exit(1);
391: }
1.31 markus 392: break;
393: case 'l':
394: options.user = optarg;
395: break;
1.141 stevesk 396:
397: case 'L':
1.31 markus 398: case 'R':
1.141 stevesk 399: if (sscanf(optarg, "%5[0-9]:%255[^:]:%5[0-9]",
400: sfwd_port, buf, sfwd_host_port) != 3 &&
401: sscanf(optarg, "%5[0-9]/%255[^/]/%5[0-9]",
402: sfwd_port, buf, sfwd_host_port) != 3) {
1.128 fgsch 403: fprintf(stderr,
1.141 stevesk 404: "Bad forwarding specification '%s'\n",
1.128 fgsch 405: optarg);
1.31 markus 406: usage();
407: /* NOTREACHED */
408: }
1.141 stevesk 409: if ((fwd_port = a2port(sfwd_port)) == 0 ||
1.165 markus 410: (fwd_host_port = a2port(sfwd_host_port)) == 0) {
1.128 fgsch 411: fprintf(stderr,
1.141 stevesk 412: "Bad forwarding port(s) '%s'\n", optarg);
413: exit(1);
1.31 markus 414: }
1.141 stevesk 415: if (opt == 'L')
416: add_local_forward(&options, fwd_port, buf,
417: fwd_host_port);
418: else if (opt == 'R')
419: add_remote_forward(&options, fwd_port, buf,
1.151 deraadt 420: fwd_host_port);
1.31 markus 421: break;
1.108 markus 422:
423: case 'D':
1.113 stevesk 424: fwd_port = a2port(optarg);
425: if (fwd_port == 0) {
1.128 fgsch 426: fprintf(stderr, "Bad dynamic port '%s'\n",
427: optarg);
1.109 markus 428: exit(1);
429: }
1.200 markus 430: add_local_forward(&options, fwd_port, "socks", 0);
1.108 markus 431: break;
432:
1.31 markus 433: case 'C':
434: options.compression = 1;
435: break;
1.45 markus 436: case 'N':
437: no_shell_flag = 1;
438: no_tty_flag = 1;
439: break;
440: case 'T':
441: no_tty_flag = 1;
442: break;
1.31 markus 443: case 'o':
444: dummy = 1;
1.205 markus 445: line = xstrdup(optarg);
1.128 fgsch 446: if (process_config_line(&options, host ? host : "",
1.205 markus 447: line, "command-line", 0, &dummy) != 0)
1.31 markus 448: exit(1);
1.205 markus 449: xfree(line);
1.31 markus 450: break;
1.85 djm 451: case 's':
452: subsystem_flag = 1;
1.117 markus 453: break;
1.214 djm 454: case 'S':
455: if (options.control_path != NULL)
456: free(options.control_path);
457: options.control_path = xstrdup(optarg);
458: break;
1.117 markus 459: case 'b':
460: options.bind_address = optarg;
1.85 djm 461: break;
1.139 markus 462: case 'F':
463: config = optarg;
464: break;
1.31 markus 465: default:
466: usage();
1.1 deraadt 467: }
1.31 markus 468: }
469:
1.128 fgsch 470: ac -= optind;
471: av += optind;
472:
473: if (ac > 0 && !host && **av != '-') {
1.188 markus 474: if (strrchr(*av, '@')) {
1.128 fgsch 475: p = xstrdup(*av);
1.188 markus 476: cp = strrchr(p, '@');
1.128 fgsch 477: if (cp == NULL || cp == p)
478: usage();
479: options.user = p;
480: *cp = '\0';
481: host = ++cp;
482: } else
483: host = *av;
1.189 millert 484: if (ac > 1) {
485: optind = optreset = 1;
1.128 fgsch 486: goto again;
487: }
1.189 millert 488: ac--, av++;
1.128 fgsch 489: }
490:
1.31 markus 491: /* Check that we got a host name. */
492: if (!host)
493: usage();
494:
1.54 markus 495: SSLeay_add_all_algorithms();
1.72 markus 496: ERR_load_crypto_strings();
1.31 markus 497:
498: /* Initialize the command to execute on remote host. */
499: buffer_init(&command);
1.1 deraadt 500:
1.33 markus 501: /*
502: * Save the command to execute on the remote host in a buffer. There
503: * is no limit on the length of the command, except by the maximum
504: * packet size. Also sets the tty flag if there is no command.
505: */
1.128 fgsch 506: if (!ac) {
1.31 markus 507: /* No command specified - execute shell on a tty. */
508: tty_flag = 1;
1.85 djm 509: if (subsystem_flag) {
1.128 fgsch 510: fprintf(stderr,
511: "You must specify a subsystem to invoke.\n");
1.85 djm 512: usage();
513: }
1.31 markus 514: } else {
1.128 fgsch 515: /* A command has been specified. Store it into the buffer. */
516: for (i = 0; i < ac; i++) {
517: if (i)
1.31 markus 518: buffer_append(&command, " ", 1);
519: buffer_append(&command, av[i], strlen(av[i]));
520: }
521: }
522:
523: /* Cannot fork to background if no command. */
1.63 markus 524: if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag)
1.31 markus 525: fatal("Cannot fork into background without a command to execute.");
526:
527: /* Allocate a tty by default if no command specified. */
528: if (buffer_len(&command) == 0)
529: tty_flag = 1;
530:
1.180 deraadt 531: /* Force no tty */
1.75 markus 532: if (no_tty_flag)
533: tty_flag = 0;
1.31 markus 534: /* Do not allocate a tty if stdin is not a tty. */
1.79 markus 535: if (!isatty(fileno(stdin)) && !force_tty_flag) {
1.31 markus 536: if (tty_flag)
1.191 itojun 537: logit("Pseudo-terminal will not be allocated because stdin is not a terminal.");
1.31 markus 538: tty_flag = 0;
539: }
1.45 markus 540:
1.101 markus 541: /*
542: * Initialize "log" output. Since we are the client all output
543: * actually goes to stderr.
544: */
1.111 markus 545: log_init(av[0], options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level,
546: SYSLOG_FACILITY_USER, 1);
1.31 markus 547:
1.139 markus 548: /*
549: * Read per-user configuration file. Ignore the system wide config
550: * file if the user specifies a config file on the command line.
551: */
552: if (config != NULL) {
1.211 djm 553: if (!read_config_file(config, host, &options, 0))
1.142 stevesk 554: fatal("Can't open user config file %.100s: "
555: "%.100s", config, strerror(errno));
1.139 markus 556: } else {
557: snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir,
558: _PATH_SSH_USER_CONFFILE);
1.210 djm 559: (void)read_config_file(buf, host, &options, 1);
1.139 markus 560:
1.145 markus 561: /* Read systemwide configuration file after use config. */
1.223 deraadt 562: (void)read_config_file(_PATH_HOST_CONFIG_FILE, host,
1.210 djm 563: &options, 0);
1.139 markus 564: }
1.31 markus 565:
566: /* Fill configuration defaults. */
567: fill_default_options(&options);
568:
1.196 djm 569: channel_set_af(options.address_family);
570:
1.31 markus 571: /* reinit */
1.101 markus 572: log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 1);
1.31 markus 573:
574: if (options.user == NULL)
575: options.user = xstrdup(pw->pw_name);
576:
577: if (options.hostname != NULL)
578: host = options.hostname;
1.195 markus 579:
580: /* force lowercase for hostkey matching */
581: if (options.host_key_alias != NULL) {
582: for (p = options.host_key_alias; *p; p++)
583: if (isupper(*p))
584: *p = tolower(*p);
585: }
1.190 markus 586:
587: if (options.proxy_command != NULL &&
588: strcmp(options.proxy_command, "none") == 0)
589: options.proxy_command = NULL;
1.31 markus 590:
1.214 djm 591: if (options.control_path != NULL) {
592: options.control_path = tilde_expand_filename(
593: options.control_path, original_real_uid);
594: }
595: if (options.control_path != NULL && options.control_master == 0)
596: control_client(options.control_path); /* This doesn't return */
597:
1.77 markus 598: /* Open a connection to the remote host. */
1.203 djm 599: if (ssh_connect(host, &hostaddr, options.port,
1.196 djm 600: options.address_family, options.connection_attempts,
1.177 markus 601: original_effective_uid == 0 && options.use_privileged_port,
1.179 markus 602: options.proxy_command) != 0)
1.178 markus 603: exit(1);
1.31 markus 604:
1.33 markus 605: /*
606: * If we successfully made the connection, load the host private key
607: * in case we will need it later for combined rsa-rhosts
608: * authentication. This must be done before releasing extra
609: * privileges, because the file is only readable by root.
1.174 markus 610: * If we cannot access the private keys, load the public keys
611: * instead and try to execute the ssh-keysign helper instead.
1.33 markus 612: */
1.112 markus 613: sensitive_data.nkeys = 0;
614: sensitive_data.keys = NULL;
1.173 markus 615: sensitive_data.external_keysign = 0;
1.178 markus 616: if (options.rhosts_rsa_authentication ||
617: options.hostbased_authentication) {
1.112 markus 618: sensitive_data.nkeys = 3;
1.180 deraadt 619: sensitive_data.keys = xmalloc(sensitive_data.nkeys *
620: sizeof(Key));
1.177 markus 621:
622: PRIV_START;
1.112 markus 623: sensitive_data.keys[0] = key_load_private_type(KEY_RSA1,
1.105 markus 624: _PATH_HOST_KEY_FILE, "", NULL);
1.112 markus 625: sensitive_data.keys[1] = key_load_private_type(KEY_DSA,
626: _PATH_HOST_DSA_KEY_FILE, "", NULL);
627: sensitive_data.keys[2] = key_load_private_type(KEY_RSA,
628: _PATH_HOST_RSA_KEY_FILE, "", NULL);
1.177 markus 629: PRIV_END;
1.173 markus 630:
1.181 markus 631: if (options.hostbased_authentication == 1 &&
632: sensitive_data.keys[0] == NULL &&
1.173 markus 633: sensitive_data.keys[1] == NULL &&
634: sensitive_data.keys[2] == NULL) {
635: sensitive_data.keys[1] = key_load_public(
636: _PATH_HOST_DSA_KEY_FILE, NULL);
637: sensitive_data.keys[2] = key_load_public(
638: _PATH_HOST_RSA_KEY_FILE, NULL);
639: sensitive_data.external_keysign = 1;
640: }
1.31 markus 641: }
1.33 markus 642: /*
643: * Get rid of any extra privileges that we may have. We will no
644: * longer need them. Also, extra privileges could make it very hard
645: * to read identity files and other non-world-readable files from the
646: * user's home directory if it happens to be on a NFS volume where
647: * root is mapped to nobody.
648: */
1.225 dtucker 649: if (original_effective_uid == 0) {
650: PRIV_START;
651: permanently_set_uid(pw);
652: }
1.31 markus 653:
1.33 markus 654: /*
655: * Now that we are back to our own permissions, create ~/.ssh
656: * directory if it doesn\'t already exist.
657: */
1.138 jakob 658: snprintf(buf, sizeof buf, "%.100s%s%.100s", pw->pw_dir, strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR);
1.31 markus 659: if (stat(buf, &st) < 0)
1.57 djm 660: if (mkdir(buf, 0700) < 0)
1.31 markus 661: error("Could not create directory '%.200s'.", buf);
662:
1.104 markus 663: /* load options.identity_files */
664: load_public_identity_files();
665:
666: /* Expand ~ in known host file names. */
667: /* XXX mem-leaks: */
1.72 markus 668: options.system_hostfile =
669: tilde_expand_filename(options.system_hostfile, original_real_uid);
670: options.user_hostfile =
671: tilde_expand_filename(options.user_hostfile, original_real_uid);
672: options.system_hostfile2 =
673: tilde_expand_filename(options.system_hostfile2, original_real_uid);
674: options.user_hostfile2 =
675: tilde_expand_filename(options.user_hostfile2, original_real_uid);
1.149 markus 676:
677: signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
1.31 markus 678:
679: /* Log into the remote system. This never returns if the login fails. */
1.173 markus 680: ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr, pw);
1.31 markus 681:
1.112 markus 682: /* We no longer need the private host keys. Clear them now. */
683: if (sensitive_data.nkeys != 0) {
684: for (i = 0; i < sensitive_data.nkeys; i++) {
685: if (sensitive_data.keys[i] != NULL) {
686: /* Destroys contents safely */
687: debug3("clear hostkey %d", i);
688: key_free(sensitive_data.keys[i]);
689: sensitive_data.keys[i] = NULL;
690: }
691: }
692: xfree(sensitive_data.keys);
1.134 markus 693: }
694: for (i = 0; i < options.num_identity_files; i++) {
695: if (options.identity_files[i]) {
696: xfree(options.identity_files[i]);
697: options.identity_files[i] = NULL;
698: }
699: if (options.identity_keys[i]) {
700: key_free(options.identity_keys[i]);
701: options.identity_keys[i] = NULL;
702: }
1.112 markus 703: }
1.31 markus 704:
1.45 markus 705: exit_status = compat20 ? ssh_session2() : ssh_session();
706: packet_close();
1.186 djm 707:
1.214 djm 708: if (options.control_path != NULL && control_fd != -1)
709: unlink(options.control_path);
710:
1.186 djm 711: /*
1.203 djm 712: * Send SIGHUP to proxy command if used. We don't wait() in
1.186 djm 713: * case it hangs and instead rely on init to reap the child
714: */
715: if (proxy_command_pid > 1)
716: kill(proxy_command_pid, SIGHUP);
717:
1.45 markus 718: return exit_status;
719: }
720:
1.202 markus 721: #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
722:
1.126 itojun 723: static void
1.150 stevesk 724: x11_get_proto(char **_proto, char **_data)
1.50 markus 725: {
1.202 markus 726: char cmd[1024];
1.50 markus 727: char line[512];
1.202 markus 728: char xdisplay[512];
1.150 stevesk 729: static char proto[512], data[512];
1.50 markus 730: FILE *f;
1.202 markus 731: int got_data = 0, generated = 0, do_unlink = 0, i;
732: char *display, *xauthdir, *xauthfile;
1.182 stevesk 733: struct stat st;
1.50 markus 734:
1.202 markus 735: xauthdir = xauthfile = NULL;
1.150 stevesk 736: *_proto = proto;
737: *_data = data;
738: proto[0] = data[0] = '\0';
1.202 markus 739:
1.182 stevesk 740: if (!options.xauth_location ||
741: (stat(options.xauth_location, &st) == -1)) {
742: debug("No xauth program.");
743: } else {
744: if ((display = getenv("DISPLAY")) == NULL) {
745: debug("x11_get_proto: DISPLAY not set");
746: return;
747: }
1.202 markus 748: /*
749: * Handle FamilyLocal case where $DISPLAY does
750: * not match an authorization entry. For this we
751: * just try "xauth list unix:displaynum.screennum".
752: * XXX: "localhost" match to determine FamilyLocal
753: * is not perfect.
754: */
755: if (strncmp(display, "localhost:", 10) == 0) {
756: snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
757: display + 10);
758: display = xdisplay;
759: }
760: if (options.forward_x11_trusted == 0) {
761: xauthdir = xmalloc(MAXPATHLEN);
762: xauthfile = xmalloc(MAXPATHLEN);
763: strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN);
764: if (mkdtemp(xauthdir) != NULL) {
765: do_unlink = 1;
766: snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile",
767: xauthdir);
768: snprintf(cmd, sizeof(cmd),
769: "%s -f %s generate %s " SSH_X11_PROTO
1.207 markus 770: " untrusted timeout 1200 2>" _PATH_DEVNULL,
1.202 markus 771: options.xauth_location, xauthfile, display);
772: debug2("x11_get_proto: %s", cmd);
773: if (system(cmd) == 0)
774: generated = 1;
775: }
776: }
777: snprintf(cmd, sizeof(cmd),
778: "%s %s%s list %s . 2>" _PATH_DEVNULL,
779: options.xauth_location,
780: generated ? "-f " : "" ,
781: generated ? xauthfile : "",
782: display);
783: debug2("x11_get_proto: %s", cmd);
784: f = popen(cmd, "r");
1.55 markus 785: if (f && fgets(line, sizeof(line), f) &&
1.150 stevesk 786: sscanf(line, "%*s %511s %511s", proto, data) == 2)
1.55 markus 787: got_data = 1;
788: if (f)
789: pclose(f);
790: }
1.202 markus 791:
792: if (do_unlink) {
793: unlink(xauthfile);
794: rmdir(xauthdir);
795: }
796: if (xauthdir)
797: xfree(xauthdir);
798: if (xauthfile)
799: xfree(xauthfile);
800:
1.50 markus 801: /*
802: * If we didn't get authentication data, just make up some
803: * data. The forwarding code will check the validity of the
804: * response anyway, and substitute this data. The X11
805: * server, however, will ignore this fake data and use
806: * whatever authentication mechanisms it was using otherwise
807: * for the local connection.
808: */
809: if (!got_data) {
1.221 avsm 810: u_int32_t rnd = 0;
1.50 markus 811:
1.202 markus 812: logit("Warning: No xauth data; "
813: "using fake authentication data for X11 forwarding.");
814: strlcpy(proto, SSH_X11_PROTO, sizeof proto);
1.50 markus 815: for (i = 0; i < 16; i++) {
816: if (i % 4 == 0)
1.221 avsm 817: rnd = arc4random();
1.202 markus 818: snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
1.221 avsm 819: rnd & 0xff);
820: rnd >>= 8;
1.50 markus 821: }
822: }
823: }
824:
1.126 itojun 825: static void
1.70 markus 826: ssh_init_forwarding(void)
827: {
1.86 markus 828: int success = 0;
1.70 markus 829: int i;
1.86 markus 830:
1.70 markus 831: /* Initiate local TCP/IP port forwardings. */
832: for (i = 0; i < options.num_local_forwards; i++) {
833: debug("Connections to local port %d forwarded to remote address %.200s:%d",
834: options.local_forwards[i].port,
835: options.local_forwards[i].host,
836: options.local_forwards[i].host_port);
1.158 markus 837: success += channel_setup_local_fwd_listener(
1.70 markus 838: options.local_forwards[i].port,
839: options.local_forwards[i].host,
840: options.local_forwards[i].host_port,
841: options.gateway_ports);
842: }
1.86 markus 843: if (i > 0 && success == 0)
844: error("Could not request local forwarding.");
1.70 markus 845:
846: /* Initiate remote TCP/IP port forwardings. */
847: for (i = 0; i < options.num_remote_forwards; i++) {
848: debug("Connections to remote port %d forwarded to local address %.200s:%d",
849: options.remote_forwards[i].port,
850: options.remote_forwards[i].host,
851: options.remote_forwards[i].host_port);
852: channel_request_remote_forwarding(
853: options.remote_forwards[i].port,
854: options.remote_forwards[i].host,
855: options.remote_forwards[i].host_port);
856: }
857: }
858:
1.126 itojun 859: static void
1.70 markus 860: check_agent_present(void)
861: {
862: if (options.forward_agent) {
863: /* Clear agent forwarding if we don\'t have an agent. */
1.185 stevesk 864: if (!ssh_agent_present())
1.70 markus 865: options.forward_agent = 0;
866: }
867: }
868:
1.126 itojun 869: static int
1.45 markus 870: ssh_session(void)
871: {
872: int type;
873: int interactive = 0;
874: int have_tty = 0;
875: struct winsize ws;
876: char *cp;
877:
1.31 markus 878: /* Enable compression if requested. */
879: if (options.compression) {
880: debug("Requesting compression at level %d.", options.compression_level);
881:
882: if (options.compression_level < 1 || options.compression_level > 9)
883: fatal("Compression level must be from 1 (fast) to 9 (slow, best).");
884:
885: /* Send the request. */
886: packet_start(SSH_CMSG_REQUEST_COMPRESSION);
887: packet_put_int(options.compression_level);
888: packet_send();
889: packet_write_wait();
1.156 markus 890: type = packet_read();
1.31 markus 891: if (type == SSH_SMSG_SUCCESS)
892: packet_start_compression(options.compression_level);
893: else if (type == SSH_SMSG_FAILURE)
1.191 itojun 894: logit("Warning: Remote host refused compression.");
1.31 markus 895: else
896: packet_disconnect("Protocol error waiting for compression response.");
897: }
898: /* Allocate a pseudo tty if appropriate. */
899: if (tty_flag) {
900: debug("Requesting pty.");
901:
902: /* Start the packet. */
903: packet_start(SSH_CMSG_REQUEST_PTY);
904:
905: /* Store TERM in the packet. There is no limit on the
906: length of the string. */
907: cp = getenv("TERM");
908: if (!cp)
909: cp = "";
1.124 markus 910: packet_put_cstring(cp);
1.31 markus 911:
912: /* Store window size in the packet. */
913: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
914: memset(&ws, 0, sizeof(ws));
915: packet_put_int(ws.ws_row);
916: packet_put_int(ws.ws_col);
917: packet_put_int(ws.ws_xpixel);
918: packet_put_int(ws.ws_ypixel);
919:
920: /* Store tty modes in the packet. */
1.115 stevesk 921: tty_make_modes(fileno(stdin), NULL);
1.31 markus 922:
923: /* Send the packet, and wait for it to leave. */
924: packet_send();
925: packet_write_wait();
926:
927: /* Read response from the server. */
1.156 markus 928: type = packet_read();
1.43 markus 929: if (type == SSH_SMSG_SUCCESS) {
1.31 markus 930: interactive = 1;
1.45 markus 931: have_tty = 1;
1.43 markus 932: } else if (type == SSH_SMSG_FAILURE)
1.191 itojun 933: logit("Warning: Remote host failed or refused to allocate a pseudo tty.");
1.31 markus 934: else
935: packet_disconnect("Protocol error waiting for pty request response.");
936: }
937: /* Request X11 forwarding if enabled and DISPLAY is set. */
938: if (options.forward_x11 && getenv("DISPLAY") != NULL) {
1.150 stevesk 939: char *proto, *data;
1.50 markus 940: /* Get reasonable local authentication information. */
1.150 stevesk 941: x11_get_proto(&proto, &data);
1.50 markus 942: /* Request forwarding with authentication spoofing. */
1.31 markus 943: debug("Requesting X11 forwarding with authentication spoofing.");
1.50 markus 944: x11_request_forwarding_with_spoofing(0, proto, data);
1.31 markus 945:
946: /* Read response from the server. */
1.156 markus 947: type = packet_read();
1.31 markus 948: if (type == SSH_SMSG_SUCCESS) {
949: interactive = 1;
1.50 markus 950: } else if (type == SSH_SMSG_FAILURE) {
1.191 itojun 951: logit("Warning: Remote host denied X11 forwarding.");
1.50 markus 952: } else {
1.31 markus 953: packet_disconnect("Protocol error waiting for X11 forwarding");
1.50 markus 954: }
1.31 markus 955: }
956: /* Tell the packet module whether this is an interactive session. */
1.80 markus 957: packet_set_interactive(interactive);
1.31 markus 958:
959: /* Request authentication agent forwarding if appropriate. */
1.70 markus 960: check_agent_present();
961:
1.31 markus 962: if (options.forward_agent) {
963: debug("Requesting authentication agent forwarding.");
964: auth_request_forwarding();
965:
966: /* Read response from the server. */
1.156 markus 967: type = packet_read();
1.155 markus 968: packet_check_eom();
1.31 markus 969: if (type != SSH_SMSG_SUCCESS)
1.191 itojun 970: logit("Warning: Remote host denied authentication agent forwarding.");
1.31 markus 971: }
972:
1.70 markus 973: /* Initiate port forwardings. */
974: ssh_init_forwarding();
1.34 markus 975:
976: /* If requested, let ssh continue in the background. */
1.48 markus 977: if (fork_after_authentication_flag)
1.34 markus 978: if (daemon(1, 1) < 0)
979: fatal("daemon() failed: %.200s", strerror(errno));
1.31 markus 980:
1.33 markus 981: /*
982: * If a command was specified on the command line, execute the
983: * command now. Otherwise request the server to start a shell.
984: */
1.31 markus 985: if (buffer_len(&command) > 0) {
986: int len = buffer_len(&command);
987: if (len > 900)
988: len = 900;
1.152 stevesk 989: debug("Sending command: %.*s", len, (u_char *)buffer_ptr(&command));
1.31 markus 990: packet_start(SSH_CMSG_EXEC_CMD);
991: packet_put_string(buffer_ptr(&command), buffer_len(&command));
992: packet_send();
993: packet_write_wait();
994: } else {
995: debug("Requesting shell.");
996: packet_start(SSH_CMSG_EXEC_SHELL);
997: packet_send();
998: packet_write_wait();
999: }
1000:
1001: /* Enter the interactive session. */
1.119 stevesk 1002: return client_loop(have_tty, tty_flag ?
1003: options.escape_char : SSH_ESCAPECHAR_NONE, 0);
1.45 markus 1004: }
1005:
1.126 itojun 1006: static void
1.214 djm 1007: ssh_subsystem_reply(int type, u_int32_t seq, void *ctxt)
1.89 markus 1008: {
1009: int id, len;
1010:
1011: id = packet_get_int();
1012: len = buffer_len(&command);
1.100 markus 1013: if (len > 900)
1014: len = 900;
1.155 markus 1015: packet_check_eom();
1.89 markus 1016: if (type == SSH2_MSG_CHANNEL_FAILURE)
1017: fatal("Request for subsystem '%.*s' failed on channel %d",
1.152 stevesk 1018: len, (u_char *)buffer_ptr(&command), id);
1.170 markus 1019: }
1020:
1021: void
1.206 markus 1022: client_global_request_reply_fwd(int type, u_int32_t seq, void *ctxt)
1.170 markus 1023: {
1024: int i;
1025:
1026: i = client_global_request_id++;
1.206 markus 1027: if (i >= options.num_remote_forwards)
1.170 markus 1028: return;
1029: debug("remote forward %s for: listen %d, connect %s:%d",
1030: type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
1031: options.remote_forwards[i].port,
1032: options.remote_forwards[i].host,
1033: options.remote_forwards[i].host_port);
1034: if (type == SSH2_MSG_REQUEST_FAILURE)
1.191 itojun 1035: logit("Warning: remote port forwarding failed for listen port %d",
1.170 markus 1036: options.remote_forwards[i].port);
1.89 markus 1037: }
1038:
1.126 itojun 1039: static void
1.214 djm 1040: ssh_control_listener(void)
1.45 markus 1041: {
1.214 djm 1042: struct sockaddr_un addr;
1043: mode_t old_umask;
1.223 deraadt 1044:
1.216 djm 1045: if (options.control_path == NULL || options.control_master <= 0)
1.214 djm 1046: return;
1047:
1048: memset(&addr, '\0', sizeof(addr));
1049: addr.sun_family = AF_UNIX;
1050: addr.sun_len = offsetof(struct sockaddr_un, sun_path) +
1051: strlen(options.control_path) + 1;
1052:
1053: if (strlcpy(addr.sun_path, options.control_path,
1054: sizeof(addr.sun_path)) >= sizeof(addr.sun_path))
1055: fatal("ControlPath too long");
1056:
1057: if ((control_fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0)
1058: fatal("%s socket(): %s\n", __func__, strerror(errno));
1059:
1060: old_umask = umask(0177);
1061: if (bind(control_fd, (struct sockaddr*)&addr, addr.sun_len) == -1) {
1062: control_fd = -1;
1063: if (errno == EINVAL)
1064: fatal("ControlSocket %s already exists",
1065: options.control_path);
1066: else
1067: fatal("%s bind(): %s\n", __func__, strerror(errno));
1068: }
1069: umask(old_umask);
1.80 markus 1070:
1.214 djm 1071: if (listen(control_fd, 64) == -1)
1072: fatal("%s listen(): %s\n", __func__, strerror(errno));
1.31 markus 1073:
1.214 djm 1074: set_nonblock(control_fd);
1075: }
1.45 markus 1076:
1.214 djm 1077: /* request pty/x11/agent/tcpfwd/shell for channel */
1078: static void
1079: ssh_session2_setup(int id, void *arg)
1080: {
1.215 djm 1081: extern char **environ;
1082:
1.214 djm 1083: int interactive = tty_flag;
1084: if (options.forward_x11 && getenv("DISPLAY") != NULL) {
1.150 stevesk 1085: char *proto, *data;
1.50 markus 1086: /* Get reasonable local authentication information. */
1.150 stevesk 1087: x11_get_proto(&proto, &data);
1.50 markus 1088: /* Request forwarding with authentication spoofing. */
1089: debug("Requesting X11 forwarding with authentication spoofing.");
1090: x11_request_forwarding_with_spoofing(id, proto, data);
1.80 markus 1091: interactive = 1;
1.50 markus 1092: /* XXX wait for reply */
1093: }
1094:
1.70 markus 1095: check_agent_present();
1096: if (options.forward_agent) {
1097: debug("Requesting authentication agent forwarding.");
1098: channel_request_start(id, "auth-agent-req@openssh.com", 0);
1099: packet_send();
1.212 djm 1100: }
1101:
1.214 djm 1102: client_session2_setup(id, tty_flag, subsystem_flag, getenv("TERM"),
1.215 djm 1103: NULL, fileno(stdin), &command, environ, &ssh_subsystem_reply);
1.90 markus 1104:
1.80 markus 1105: packet_set_interactive(interactive);
1.45 markus 1106: }
1107:
1.143 markus 1108: /* open new channel for a session */
1.126 itojun 1109: static int
1.143 markus 1110: ssh_session2_open(void)
1.45 markus 1111: {
1.118 markus 1112: Channel *c;
1113: int window, packetmax, in, out, err;
1.60 markus 1114:
1.62 markus 1115: if (stdin_null_flag) {
1.93 itojun 1116: in = open(_PATH_DEVNULL, O_RDONLY);
1.62 markus 1117: } else {
1118: in = dup(STDIN_FILENO);
1119: }
1.60 markus 1120: out = dup(STDOUT_FILENO);
1121: err = dup(STDERR_FILENO);
1.45 markus 1122:
1123: if (in < 0 || out < 0 || err < 0)
1.62 markus 1124: fatal("dup() in/out/err failed");
1.45 markus 1125:
1.69 markus 1126: /* enable nonblocking unless tty */
1127: if (!isatty(in))
1128: set_nonblock(in);
1129: if (!isatty(out))
1130: set_nonblock(out);
1131: if (!isatty(err))
1132: set_nonblock(err);
1133:
1.65 markus 1134: window = CHAN_SES_WINDOW_DEFAULT;
1135: packetmax = CHAN_SES_PACKET_DEFAULT;
1.164 markus 1136: if (tty_flag) {
1137: window >>= 1;
1138: packetmax >>= 1;
1.45 markus 1139: }
1.118 markus 1140: c = channel_new(
1.45 markus 1141: "session", SSH_CHANNEL_OPENING, in, out, err,
1.65 markus 1142: window, packetmax, CHAN_EXTENDED_WRITE,
1.192 markus 1143: "client-session", /*nonblock*/0);
1.45 markus 1144:
1.143 markus 1145: debug3("ssh_session2_open: channel_new: %d", c->self);
1.106 markus 1146:
1.122 markus 1147: channel_send_open(c->self);
1.143 markus 1148: if (!no_shell_flag)
1.214 djm 1149: channel_register_confirm(c->self, ssh_session2_setup, NULL);
1.106 markus 1150:
1.118 markus 1151: return c->self;
1.106 markus 1152: }
1153:
1.126 itojun 1154: static int
1.106 markus 1155: ssh_session2(void)
1156: {
1.143 markus 1157: int id = -1;
1.106 markus 1158:
1159: /* XXX should be pre-session */
1160: ssh_init_forwarding();
1.214 djm 1161: ssh_control_listener();
1.106 markus 1162:
1.143 markus 1163: if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN))
1164: id = ssh_session2_open();
1.106 markus 1165:
1166: /* If requested, let ssh continue in the background. */
1167: if (fork_after_authentication_flag)
1168: if (daemon(1, 1) < 0)
1169: fatal("daemon() failed: %.200s", strerror(errno));
1.31 markus 1170:
1.119 stevesk 1171: return client_loop(tty_flag, tty_flag ?
1172: options.escape_char : SSH_ESCAPECHAR_NONE, id);
1.72 markus 1173: }
1174:
1.126 itojun 1175: static void
1.104 markus 1176: load_public_identity_files(void)
1177: {
1178: char *filename;
1.167 markus 1179: int i = 0;
1.104 markus 1180: Key *public;
1.167 markus 1181: #ifdef SMARTCARD
1182: Key **keys;
1.104 markus 1183:
1.133 markus 1184: if (options.smartcard_device != NULL &&
1.167 markus 1185: options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
1186: (keys = sc_get_keys(options.smartcard_device, NULL)) != NULL ) {
1187: int count = 0;
1188: for (i = 0; keys[i] != NULL; i++) {
1189: count++;
1190: memmove(&options.identity_files[1], &options.identity_files[0],
1191: sizeof(char *) * (SSH_MAX_IDENTITY_FILES - 1));
1192: memmove(&options.identity_keys[1], &options.identity_keys[0],
1193: sizeof(Key *) * (SSH_MAX_IDENTITY_FILES - 1));
1194: options.num_identity_files++;
1195: options.identity_keys[0] = keys[i];
1.194 markus 1196: options.identity_files[0] = sc_get_key_label(keys[i]);
1.167 markus 1197: }
1.168 markus 1198: if (options.num_identity_files > SSH_MAX_IDENTITY_FILES)
1199: options.num_identity_files = SSH_MAX_IDENTITY_FILES;
1.167 markus 1200: i = count;
1201: xfree(keys);
1.127 markus 1202: }
1.136 jakob 1203: #endif /* SMARTCARD */
1.131 millert 1204: for (; i < options.num_identity_files; i++) {
1205: filename = tilde_expand_filename(options.identity_files[i],
1206: original_real_uid);
1207: public = key_load_public(filename, NULL);
1208: debug("identity file %s type %d", filename,
1209: public ? public->type : -1);
1210: xfree(options.identity_files[i]);
1211: options.identity_files[i] = filename;
1212: options.identity_keys[i] = public;
1213: }
1.214 djm 1214: }
1215:
1216: static void
1217: control_client_sighandler(int signo)
1218: {
1219: control_client_terminate = signo;
1220: }
1221:
1222: static void
1223: control_client_sigrelay(int signo)
1224: {
1225: if (control_server_pid > 1)
1226: kill(control_server_pid, signo);
1227: }
1228:
1.220 djm 1229: static int
1230: env_permitted(char *env)
1231: {
1232: int i;
1233: char name[1024], *cp;
1234:
1235: strlcpy(name, env, sizeof(name));
1236: if ((cp = strchr(name, '=')) == NULL)
1237: return (0);
1238:
1239: *cp = '\0';
1240:
1241: for (i = 0; i < options.num_send_env; i++)
1242: if (match_pattern(name, options.send_env[i]))
1243: return (1);
1244:
1245: return (0);
1246: }
1247:
1.214 djm 1248: static void
1249: control_client(const char *path)
1250: {
1251: struct sockaddr_un addr;
1.228 djm 1252: int i, r, fd, sock, exitval, num_env;
1.214 djm 1253: Buffer m;
1.229 djm 1254: char *term;
1.215 djm 1255: extern char **environ;
1.229 djm 1256: u_int flags;
1.228 djm 1257:
1258: if (stdin_null_flag) {
1259: if ((fd = open(_PATH_DEVNULL, O_RDONLY)) == -1)
1260: fatal("open(/dev/null): %s", strerror(errno));
1261: if (dup2(fd, STDIN_FILENO) == -1)
1262: fatal("dup2: %s", strerror(errno));
1263: if (fd > STDERR_FILENO)
1264: close(fd);
1265: }
1.223 deraadt 1266:
1.214 djm 1267: memset(&addr, '\0', sizeof(addr));
1268: addr.sun_family = AF_UNIX;
1269: addr.sun_len = offsetof(struct sockaddr_un, sun_path) +
1270: strlen(path) + 1;
1271:
1272: if (strlcpy(addr.sun_path, path,
1273: sizeof(addr.sun_path)) >= sizeof(addr.sun_path))
1274: fatal("ControlPath too long");
1275:
1276: if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) < 0)
1277: fatal("%s socket(): %s", __func__, strerror(errno));
1278:
1279: if (connect(sock, (struct sockaddr*)&addr, addr.sun_len) == -1)
1280: fatal("Couldn't connect to %s: %s", path, strerror(errno));
1281:
1.229 djm 1282: if ((term = getenv("TERM")) == NULL)
1283: term = "";
1284:
1285: flags = 0;
1286: if (tty_flag)
1287: flags |= SSHMUX_FLAG_TTY;
1288: if (subsystem_flag)
1289: flags |= SSHMUX_FLAG_SUBSYS;
1.214 djm 1290:
1291: buffer_init(&m);
1292:
1.229 djm 1293: /* Send our command to server */
1294: buffer_put_int(&m, mux_command);
1295: buffer_put_int(&m, flags);
1296: if (ssh_msg_send(sock, /* version */1, &m) == -1)
1297: fatal("%s: msg_send", __func__);
1298: buffer_clear(&m);
1299:
1300: /* Get authorisation status and PID of controlee */
1.214 djm 1301: if (ssh_msg_recv(sock, &m) == -1)
1302: fatal("%s: msg_recv", __func__);
1.229 djm 1303: if (buffer_get_char(&m) != 1)
1.214 djm 1304: fatal("%s: wrong version", __func__);
1.216 djm 1305: if (buffer_get_int(&m) != 1)
1306: fatal("Connection to master denied");
1.214 djm 1307: control_server_pid = buffer_get_int(&m);
1308:
1309: buffer_clear(&m);
1310:
1.229 djm 1311: switch (mux_command) {
1312: case SSHMUX_COMMAND_ALIVE_CHECK:
1313: fprintf(stderr, "Master running (pid=%d)\r\n",
1314: control_server_pid);
1315: exit(0);
1316: case SSHMUX_COMMAND_TERMINATE:
1317: fprintf(stderr, "Exit request sent.\r\n");
1318: exit(0);
1319: case SSHMUX_COMMAND_OPEN:
1320: /* continue below */
1321: break;
1322: default:
1323: fatal("silly mux_command %d", mux_command);
1324: }
1325:
1326: /* SSHMUX_COMMAND_OPEN */
1327: buffer_put_cstring(&m, term);
1.214 djm 1328: buffer_append(&command, "\0", 1);
1329: buffer_put_cstring(&m, buffer_ptr(&command));
1.215 djm 1330:
1.220 djm 1331: if (options.num_send_env == 0 || environ == NULL) {
1332: buffer_put_int(&m, 0);
1.223 deraadt 1333: } else {
1.220 djm 1334: /* Pass environment */
1335: num_env = 0;
1336: for (i = 0; environ[i] != NULL; i++)
1337: if (env_permitted(environ[i]))
1338: num_env++; /* Count */
1.223 deraadt 1339:
1.220 djm 1340: buffer_put_int(&m, num_env);
1341:
1.222 dtucker 1342: for (i = 0; environ[i] != NULL && num_env >= 0; i++)
1343: if (env_permitted(environ[i])) {
1344: num_env--;
1.220 djm 1345: buffer_put_cstring(&m, environ[i]);
1.222 dtucker 1346: }
1.220 djm 1347: }
1.214 djm 1348:
1.229 djm 1349: if (ssh_msg_send(sock, /* version */1, &m) == -1)
1.214 djm 1350: fatal("%s: msg_send", __func__);
1351:
1352: mm_send_fd(sock, STDIN_FILENO);
1353: mm_send_fd(sock, STDOUT_FILENO);
1354: mm_send_fd(sock, STDERR_FILENO);
1355:
1356: /* Wait for reply, so master has a chance to gather ttymodes */
1357: buffer_clear(&m);
1358: if (ssh_msg_recv(sock, &m) == -1)
1359: fatal("%s: msg_recv", __func__);
1.229 djm 1360: if (buffer_get_char(&m) != 1)
1361: fatal("%s: wrong version", __func__);
1.214 djm 1362: buffer_free(&m);
1.218 djm 1363:
1.226 djm 1364: signal(SIGHUP, control_client_sighandler);
1.218 djm 1365: signal(SIGINT, control_client_sighandler);
1366: signal(SIGTERM, control_client_sighandler);
1367: signal(SIGWINCH, control_client_sigrelay);
1.214 djm 1368:
1369: if (tty_flag)
1370: enter_raw_mode();
1371:
1372: /* Stick around until the controlee closes the client_fd */
1373: exitval = 0;
1374: for (;!control_client_terminate;) {
1375: r = read(sock, &exitval, sizeof(exitval));
1376: if (r == 0) {
1377: debug2("Received EOF from master");
1378: break;
1379: }
1380: if (r > 0)
1381: debug2("Received exit status from master %d", exitval);
1382: if (r == -1 && errno != EINTR)
1383: fatal("%s: read %s", __func__, strerror(errno));
1384: }
1385:
1386: if (control_client_terminate)
1387: debug2("Exiting on signal %d", control_client_terminate);
1388:
1389: close(sock);
1390:
1391: leave_raw_mode();
1392:
1393: if (tty_flag && options.log_level != SYSLOG_LEVEL_QUIET)
1394: fprintf(stderr, "Connection to master closed.\r\n");
1395:
1396: exit(exitval);
1.1 deraadt 1397: }
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