Annotation of src/usr.bin/ssh/ssh.c, Revision 1.218
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"
1.218 ! djm 43: RCSID("$OpenBSD: ssh.c,v 1.217 2004/06/17 23:56:57 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"
1.49 markus 74:
1.127 markus 75: #ifdef SMARTCARD
76: #include "scard.h"
1.137 jakob 77: #endif
1.127 markus 78:
1.49 markus 79: extern char *__progname;
1.1 deraadt 80:
1.31 markus 81: /* Flag indicating whether debug mode is on. This can be set on the command line. */
1.1 deraadt 82: int debug_flag = 0;
83:
1.46 markus 84: /* Flag indicating whether a tty should be allocated */
1.1 deraadt 85: int tty_flag = 0;
1.79 markus 86: int no_tty_flag = 0;
87: int force_tty_flag = 0;
1.1 deraadt 88:
1.45 markus 89: /* don't exec a shell */
90: int no_shell_flag = 0;
91:
1.33 markus 92: /*
93: * Flag indicating that nothing should be read from stdin. This can be set
94: * on the command line.
95: */
1.1 deraadt 96: int stdin_null_flag = 0;
97:
1.33 markus 98: /*
99: * Flag indicating that ssh should fork after authentication. This is useful
1.172 deraadt 100: * so that the passphrase can be entered manually, and then ssh goes to the
1.33 markus 101: * background.
102: */
1.1 deraadt 103: int fork_after_authentication_flag = 0;
104:
1.33 markus 105: /*
106: * General data structure for command line options and options configurable
107: * in configuration files. See readconf.h.
108: */
1.1 deraadt 109: Options options;
110:
1.139 markus 111: /* optional user configfile */
112: char *config = NULL;
113:
1.33 markus 114: /*
115: * Name of the host we are connecting to. This is the name given on the
116: * command line, or the HostName specified for the user-supplied name in a
117: * configuration file.
118: */
1.1 deraadt 119: char *host;
120:
1.22 provos 121: /* socket address the host resolves to */
1.37 markus 122: struct sockaddr_storage hostaddr;
1.1 deraadt 123:
1.112 markus 124: /* Private host keys. */
1.173 markus 125: Sensitive sensitive_data;
1.1 deraadt 126:
1.10 dugsong 127: /* Original real UID. */
128: uid_t original_real_uid;
1.177 markus 129: uid_t original_effective_uid;
1.1 deraadt 130:
1.45 markus 131: /* command to be executed */
132: Buffer command;
133:
1.85 djm 134: /* Should we execute a command or invoke a subsystem? */
135: int subsystem_flag = 0;
136:
1.170 markus 137: /* # of replies received for global requests */
138: static int client_global_request_id = 0;
139:
1.186 djm 140: /* pid of proxycommand child process */
141: pid_t proxy_command_pid = 0;
142:
1.214 djm 143: /* fd to control socket */
144: int control_fd = -1;
145:
146: /* Only used in control client mode */
147: volatile sig_atomic_t control_client_terminate = 0;
148: u_int control_server_pid = 0;
149:
1.1 deraadt 150: /* Prints a help message to the user. This function never returns. */
151:
1.126 itojun 152: static void
1.93 itojun 153: usage(void)
1.1 deraadt 154: {
1.208 markus 155: fprintf(stderr,
1.217 djm 156: "usage: ssh [-1246AaCfghkMNnqsTtVvXxY] [-b bind_address] [-c cipher_spec]\n"
1.208 markus 157: " [-D port] [-e escape_char] [-F configfile] [-i identity_file]\n"
158: " [-L port:host:hostport] [-l login_name] [-m mac_spec] [-o option]\n"
1.217 djm 159: " [-p port] [-R port:host:hostport] [-S ctl_path]\n"
160: " [user@]hostname [command]\n"
1.208 markus 161: );
1.31 markus 162: exit(1);
1.1 deraadt 163: }
164:
1.126 itojun 165: static int ssh_session(void);
166: static int ssh_session2(void);
167: static void load_public_identity_files(void);
1.214 djm 168: static void control_client(const char *path);
1.45 markus 169:
1.32 deraadt 170: /*
171: * Main program for the ssh client.
172: */
1.2 provos 173: int
174: main(int ac, char **av)
1.1 deraadt 175: {
1.178 markus 176: int i, opt, exit_status;
1.35 markus 177: u_short fwd_port, fwd_host_port;
1.141 stevesk 178: char sfwd_port[6], sfwd_host_port[6];
1.205 markus 179: char *p, *cp, *line, buf[256];
1.31 markus 180: struct stat st;
1.98 markus 181: struct passwd *pw;
1.45 markus 182: int dummy;
1.144 stevesk 183: extern int optind, optreset;
184: extern char *optarg;
1.31 markus 185:
1.33 markus 186: /*
187: * Save the original real uid. It will be needed later (uid-swapping
188: * may clobber the real uid).
189: */
1.31 markus 190: original_real_uid = getuid();
191: original_effective_uid = geteuid();
192:
1.184 stevesk 193: /*
194: * Use uid-swapping to give up root privileges for the duration of
195: * option processing. We will re-instantiate the rights when we are
196: * ready to create the privileged port, and will permanently drop
197: * them when the port has been created (actually, when the connection
198: * has been made, as we may need to create the port several times).
199: */
200: PRIV_END;
201:
1.31 markus 202: /* If we are installed setuid root be careful to not drop core. */
203: if (original_real_uid != original_effective_uid) {
204: struct rlimit rlim;
205: rlim.rlim_cur = rlim.rlim_max = 0;
206: if (setrlimit(RLIMIT_CORE, &rlim) < 0)
207: fatal("setrlimit failed: %.100s", strerror(errno));
1.1 deraadt 208: }
1.107 markus 209: /* Get user data. */
210: pw = getpwuid(original_real_uid);
211: if (!pw) {
1.191 itojun 212: logit("You don't exist, go away!");
1.107 markus 213: exit(1);
214: }
215: /* Take a copy of the returned structure. */
216: pw = pwcopy(pw);
1.31 markus 217:
1.33 markus 218: /*
219: * Set our umask to something reasonable, as some files are created
220: * with the default umask. This will make them world-readable but
221: * writable only by the owner, which is ok for all files for which we
222: * don't set the modes explicitly.
223: */
1.31 markus 224: umask(022);
225:
226: /* Initialize option structure to indicate that no values have been set. */
227: initialize_options(&options);
228:
229: /* Parse command-line arguments. */
230: host = NULL;
231:
1.128 fgsch 232: again:
233: while ((opt = getopt(ac, av,
1.214 djm 234: "1246ab:c:e:fgi:kl:m:no:p:qstvxACD:F:I:L:MNPR:S:TVXY")) != -1) {
1.31 markus 235: switch (opt) {
1.91 jakob 236: case '1':
237: options.protocol = SSH_PROTO_1;
238: break;
1.47 markus 239: case '2':
240: options.protocol = SSH_PROTO_2;
241: break;
1.37 markus 242: case '4':
1.196 djm 243: options.address_family = AF_INET;
1.37 markus 244: break;
245: case '6':
1.196 djm 246: options.address_family = AF_INET6;
1.37 markus 247: break;
1.31 markus 248: case 'n':
249: stdin_null_flag = 1;
250: break;
251: case 'f':
252: fork_after_authentication_flag = 1;
253: stdin_null_flag = 1;
254: break;
255: case 'x':
256: options.forward_x11 = 0;
257: break;
258: case 'X':
259: options.forward_x11 = 1;
260: break;
1.202 markus 261: case 'Y':
262: options.forward_x11 = 1;
263: options.forward_x11_trusted = 1;
264: break;
1.31 markus 265: case 'g':
266: options.gateway_ports = 1;
267: break;
1.183 stevesk 268: case 'P': /* deprecated */
1.31 markus 269: options.use_privileged_port = 0;
270: break;
271: case 'a':
272: options.forward_agent = 0;
1.53 markus 273: break;
274: case 'A':
275: options.forward_agent = 1;
1.31 markus 276: break;
277: case 'k':
1.204 dtucker 278: options.gss_deleg_creds = 0;
1.31 markus 279: break;
280: case 'i':
281: if (stat(optarg, &st) < 0) {
1.128 fgsch 282: fprintf(stderr, "Warning: Identity file %s "
283: "does not exist.\n", optarg);
1.31 markus 284: break;
285: }
1.128 fgsch 286: if (options.num_identity_files >=
287: SSH_MAX_IDENTITY_FILES)
288: fatal("Too many identity files specified "
289: "(max %d)", SSH_MAX_IDENTITY_FILES);
290: options.identity_files[options.num_identity_files++] =
291: xstrdup(optarg);
1.31 markus 292: break;
1.127 markus 293: case 'I':
294: #ifdef SMARTCARD
1.133 markus 295: options.smartcard_device = xstrdup(optarg);
1.137 jakob 296: #else
1.127 markus 297: fprintf(stderr, "no support for smartcards.\n");
1.137 jakob 298: #endif
1.127 markus 299: break;
1.31 markus 300: case 't':
1.79 markus 301: if (tty_flag)
302: force_tty_flag = 1;
1.31 markus 303: tty_flag = 1;
304: break;
305: case 'v':
1.197 markus 306: if (debug_flag == 0) {
1.66 markus 307: debug_flag = 1;
308: options.log_level = SYSLOG_LEVEL_DEBUG1;
1.197 markus 309: } else {
310: if (options.log_level < SYSLOG_LEVEL_DEBUG3)
311: options.log_level++;
1.66 markus 312: break;
1.197 markus 313: }
1.66 markus 314: /* fallthrough */
1.31 markus 315: case 'V':
1.209 markus 316: fprintf(stderr, "%s, %s\n",
317: SSH_VERSION, SSLeay_version(SSLEAY_VERSION));
1.31 markus 318: if (opt == 'V')
319: exit(0);
320: break;
321: case 'q':
322: options.log_level = SYSLOG_LEVEL_QUIET;
323: break;
324: case 'e':
325: if (optarg[0] == '^' && optarg[2] == 0 &&
1.128 fgsch 326: (u_char) optarg[1] >= 64 &&
327: (u_char) optarg[1] < 128)
1.78 markus 328: options.escape_char = (u_char) optarg[1] & 31;
1.31 markus 329: else if (strlen(optarg) == 1)
1.78 markus 330: options.escape_char = (u_char) optarg[0];
1.31 markus 331: else if (strcmp(optarg, "none") == 0)
1.119 stevesk 332: options.escape_char = SSH_ESCAPECHAR_NONE;
1.31 markus 333: else {
1.128 fgsch 334: fprintf(stderr, "Bad escape character '%s'.\n",
335: optarg);
1.31 markus 336: exit(1);
337: }
338: break;
339: case 'c':
1.49 markus 340: if (ciphers_valid(optarg)) {
341: /* SSH2 only */
342: options.ciphers = xstrdup(optarg);
1.51 markus 343: options.cipher = SSH_CIPHER_ILLEGAL;
1.49 markus 344: } else {
345: /* SSH1 only */
1.74 markus 346: options.cipher = cipher_number(optarg);
347: if (options.cipher == -1) {
1.128 fgsch 348: fprintf(stderr,
349: "Unknown cipher type '%s'\n",
350: optarg);
1.49 markus 351: exit(1);
352: }
1.128 fgsch 353: if (options.cipher == SSH_CIPHER_3DES)
1.74 markus 354: options.ciphers = "3des-cbc";
1.128 fgsch 355: else if (options.cipher == SSH_CIPHER_BLOWFISH)
1.74 markus 356: options.ciphers = "blowfish-cbc";
1.128 fgsch 357: else
1.74 markus 358: options.ciphers = (char *)-1;
1.95 markus 359: }
360: break;
361: case 'm':
362: if (mac_valid(optarg))
363: options.macs = xstrdup(optarg);
364: else {
1.128 fgsch 365: fprintf(stderr, "Unknown mac type '%s'\n",
366: optarg);
1.95 markus 367: exit(1);
1.31 markus 368: }
369: break;
1.214 djm 370: case 'M':
371: options.control_master = 1;
372: break;
1.31 markus 373: case 'p':
1.113 stevesk 374: options.port = a2port(optarg);
375: if (options.port == 0) {
1.109 markus 376: fprintf(stderr, "Bad port '%s'\n", optarg);
377: exit(1);
378: }
1.31 markus 379: break;
380: case 'l':
381: options.user = optarg;
382: break;
1.141 stevesk 383:
384: case 'L':
1.31 markus 385: case 'R':
1.141 stevesk 386: if (sscanf(optarg, "%5[0-9]:%255[^:]:%5[0-9]",
387: sfwd_port, buf, sfwd_host_port) != 3 &&
388: sscanf(optarg, "%5[0-9]/%255[^/]/%5[0-9]",
389: sfwd_port, buf, sfwd_host_port) != 3) {
1.128 fgsch 390: fprintf(stderr,
1.141 stevesk 391: "Bad forwarding specification '%s'\n",
1.128 fgsch 392: optarg);
1.31 markus 393: usage();
394: /* NOTREACHED */
395: }
1.141 stevesk 396: if ((fwd_port = a2port(sfwd_port)) == 0 ||
1.165 markus 397: (fwd_host_port = a2port(sfwd_host_port)) == 0) {
1.128 fgsch 398: fprintf(stderr,
1.141 stevesk 399: "Bad forwarding port(s) '%s'\n", optarg);
400: exit(1);
1.31 markus 401: }
1.141 stevesk 402: if (opt == 'L')
403: add_local_forward(&options, fwd_port, buf,
404: fwd_host_port);
405: else if (opt == 'R')
406: add_remote_forward(&options, fwd_port, buf,
1.151 deraadt 407: fwd_host_port);
1.31 markus 408: break;
1.108 markus 409:
410: case 'D':
1.113 stevesk 411: fwd_port = a2port(optarg);
412: if (fwd_port == 0) {
1.128 fgsch 413: fprintf(stderr, "Bad dynamic port '%s'\n",
414: optarg);
1.109 markus 415: exit(1);
416: }
1.200 markus 417: add_local_forward(&options, fwd_port, "socks", 0);
1.108 markus 418: break;
419:
1.31 markus 420: case 'C':
421: options.compression = 1;
422: break;
1.45 markus 423: case 'N':
424: no_shell_flag = 1;
425: no_tty_flag = 1;
426: break;
427: case 'T':
428: no_tty_flag = 1;
429: break;
1.31 markus 430: case 'o':
431: dummy = 1;
1.205 markus 432: line = xstrdup(optarg);
1.128 fgsch 433: if (process_config_line(&options, host ? host : "",
1.205 markus 434: line, "command-line", 0, &dummy) != 0)
1.31 markus 435: exit(1);
1.205 markus 436: xfree(line);
1.31 markus 437: break;
1.85 djm 438: case 's':
439: subsystem_flag = 1;
1.117 markus 440: break;
1.214 djm 441: case 'S':
442: if (options.control_path != NULL)
443: free(options.control_path);
444: options.control_path = xstrdup(optarg);
445: if (options.control_master == -1)
446: options.control_master = 0;
447: break;
1.117 markus 448: case 'b':
449: options.bind_address = optarg;
1.85 djm 450: break;
1.139 markus 451: case 'F':
452: config = optarg;
453: break;
1.31 markus 454: default:
455: usage();
1.1 deraadt 456: }
1.31 markus 457: }
458:
1.128 fgsch 459: ac -= optind;
460: av += optind;
461:
462: if (ac > 0 && !host && **av != '-') {
1.188 markus 463: if (strrchr(*av, '@')) {
1.128 fgsch 464: p = xstrdup(*av);
1.188 markus 465: cp = strrchr(p, '@');
1.128 fgsch 466: if (cp == NULL || cp == p)
467: usage();
468: options.user = p;
469: *cp = '\0';
470: host = ++cp;
471: } else
472: host = *av;
1.189 millert 473: if (ac > 1) {
474: optind = optreset = 1;
1.128 fgsch 475: goto again;
476: }
1.189 millert 477: ac--, av++;
1.128 fgsch 478: }
479:
1.31 markus 480: /* Check that we got a host name. */
481: if (!host)
482: usage();
483:
1.54 markus 484: SSLeay_add_all_algorithms();
1.72 markus 485: ERR_load_crypto_strings();
1.31 markus 486:
487: /* Initialize the command to execute on remote host. */
488: buffer_init(&command);
1.1 deraadt 489:
1.33 markus 490: /*
491: * Save the command to execute on the remote host in a buffer. There
492: * is no limit on the length of the command, except by the maximum
493: * packet size. Also sets the tty flag if there is no command.
494: */
1.128 fgsch 495: if (!ac) {
1.31 markus 496: /* No command specified - execute shell on a tty. */
497: tty_flag = 1;
1.85 djm 498: if (subsystem_flag) {
1.128 fgsch 499: fprintf(stderr,
500: "You must specify a subsystem to invoke.\n");
1.85 djm 501: usage();
502: }
1.31 markus 503: } else {
1.128 fgsch 504: /* A command has been specified. Store it into the buffer. */
505: for (i = 0; i < ac; i++) {
506: if (i)
1.31 markus 507: buffer_append(&command, " ", 1);
508: buffer_append(&command, av[i], strlen(av[i]));
509: }
510: }
511:
512: /* Cannot fork to background if no command. */
1.63 markus 513: if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag)
1.31 markus 514: fatal("Cannot fork into background without a command to execute.");
515:
516: /* Allocate a tty by default if no command specified. */
517: if (buffer_len(&command) == 0)
518: tty_flag = 1;
519:
1.180 deraadt 520: /* Force no tty */
1.75 markus 521: if (no_tty_flag)
522: tty_flag = 0;
1.31 markus 523: /* Do not allocate a tty if stdin is not a tty. */
1.79 markus 524: if (!isatty(fileno(stdin)) && !force_tty_flag) {
1.31 markus 525: if (tty_flag)
1.191 itojun 526: logit("Pseudo-terminal will not be allocated because stdin is not a terminal.");
1.31 markus 527: tty_flag = 0;
528: }
1.45 markus 529:
1.101 markus 530: /*
531: * Initialize "log" output. Since we are the client all output
532: * actually goes to stderr.
533: */
1.111 markus 534: log_init(av[0], options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level,
535: SYSLOG_FACILITY_USER, 1);
1.31 markus 536:
1.139 markus 537: /*
538: * Read per-user configuration file. Ignore the system wide config
539: * file if the user specifies a config file on the command line.
540: */
541: if (config != NULL) {
1.211 djm 542: if (!read_config_file(config, host, &options, 0))
1.142 stevesk 543: fatal("Can't open user config file %.100s: "
544: "%.100s", config, strerror(errno));
1.139 markus 545: } else {
546: snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir,
547: _PATH_SSH_USER_CONFFILE);
1.210 djm 548: (void)read_config_file(buf, host, &options, 1);
1.139 markus 549:
1.145 markus 550: /* Read systemwide configuration file after use config. */
1.210 djm 551: (void)read_config_file(_PATH_HOST_CONFIG_FILE, host,
552: &options, 0);
1.139 markus 553: }
1.31 markus 554:
555: /* Fill configuration defaults. */
556: fill_default_options(&options);
557:
1.196 djm 558: channel_set_af(options.address_family);
559:
1.31 markus 560: /* reinit */
1.101 markus 561: log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 1);
1.31 markus 562:
563: if (options.user == NULL)
564: options.user = xstrdup(pw->pw_name);
565:
566: if (options.hostname != NULL)
567: host = options.hostname;
1.195 markus 568:
569: /* force lowercase for hostkey matching */
570: if (options.host_key_alias != NULL) {
571: for (p = options.host_key_alias; *p; p++)
572: if (isupper(*p))
573: *p = tolower(*p);
574: }
1.190 markus 575:
576: if (options.proxy_command != NULL &&
577: strcmp(options.proxy_command, "none") == 0)
578: options.proxy_command = NULL;
1.31 markus 579:
1.214 djm 580: if (options.control_path != NULL) {
581: options.control_path = tilde_expand_filename(
582: options.control_path, original_real_uid);
583: }
584: if (options.control_path != NULL && options.control_master == 0)
585: control_client(options.control_path); /* This doesn't return */
586:
1.77 markus 587: /* Open a connection to the remote host. */
1.203 djm 588: if (ssh_connect(host, &hostaddr, options.port,
1.196 djm 589: options.address_family, options.connection_attempts,
1.177 markus 590: original_effective_uid == 0 && options.use_privileged_port,
1.179 markus 591: options.proxy_command) != 0)
1.178 markus 592: exit(1);
1.31 markus 593:
1.33 markus 594: /*
595: * If we successfully made the connection, load the host private key
596: * in case we will need it later for combined rsa-rhosts
597: * authentication. This must be done before releasing extra
598: * privileges, because the file is only readable by root.
1.174 markus 599: * If we cannot access the private keys, load the public keys
600: * instead and try to execute the ssh-keysign helper instead.
1.33 markus 601: */
1.112 markus 602: sensitive_data.nkeys = 0;
603: sensitive_data.keys = NULL;
1.173 markus 604: sensitive_data.external_keysign = 0;
1.178 markus 605: if (options.rhosts_rsa_authentication ||
606: options.hostbased_authentication) {
1.112 markus 607: sensitive_data.nkeys = 3;
1.180 deraadt 608: sensitive_data.keys = xmalloc(sensitive_data.nkeys *
609: sizeof(Key));
1.177 markus 610:
611: PRIV_START;
1.112 markus 612: sensitive_data.keys[0] = key_load_private_type(KEY_RSA1,
1.105 markus 613: _PATH_HOST_KEY_FILE, "", NULL);
1.112 markus 614: sensitive_data.keys[1] = key_load_private_type(KEY_DSA,
615: _PATH_HOST_DSA_KEY_FILE, "", NULL);
616: sensitive_data.keys[2] = key_load_private_type(KEY_RSA,
617: _PATH_HOST_RSA_KEY_FILE, "", NULL);
1.177 markus 618: PRIV_END;
1.173 markus 619:
1.181 markus 620: if (options.hostbased_authentication == 1 &&
621: sensitive_data.keys[0] == NULL &&
1.173 markus 622: sensitive_data.keys[1] == NULL &&
623: sensitive_data.keys[2] == NULL) {
624: sensitive_data.keys[1] = key_load_public(
625: _PATH_HOST_DSA_KEY_FILE, NULL);
626: sensitive_data.keys[2] = key_load_public(
627: _PATH_HOST_RSA_KEY_FILE, NULL);
628: sensitive_data.external_keysign = 1;
629: }
1.31 markus 630: }
1.33 markus 631: /*
632: * Get rid of any extra privileges that we may have. We will no
633: * longer need them. Also, extra privileges could make it very hard
634: * to read identity files and other non-world-readable files from the
635: * user's home directory if it happens to be on a NFS volume where
636: * root is mapped to nobody.
637: */
1.177 markus 638: seteuid(original_real_uid);
639: setuid(original_real_uid);
1.31 markus 640:
1.33 markus 641: /*
642: * Now that we are back to our own permissions, create ~/.ssh
643: * directory if it doesn\'t already exist.
644: */
1.138 jakob 645: snprintf(buf, sizeof buf, "%.100s%s%.100s", pw->pw_dir, strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR);
1.31 markus 646: if (stat(buf, &st) < 0)
1.57 djm 647: if (mkdir(buf, 0700) < 0)
1.31 markus 648: error("Could not create directory '%.200s'.", buf);
649:
1.104 markus 650: /* load options.identity_files */
651: load_public_identity_files();
652:
653: /* Expand ~ in known host file names. */
654: /* XXX mem-leaks: */
1.72 markus 655: options.system_hostfile =
656: tilde_expand_filename(options.system_hostfile, original_real_uid);
657: options.user_hostfile =
658: tilde_expand_filename(options.user_hostfile, original_real_uid);
659: options.system_hostfile2 =
660: tilde_expand_filename(options.system_hostfile2, original_real_uid);
661: options.user_hostfile2 =
662: tilde_expand_filename(options.user_hostfile2, original_real_uid);
1.149 markus 663:
664: signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
1.31 markus 665:
666: /* Log into the remote system. This never returns if the login fails. */
1.173 markus 667: ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr, pw);
1.31 markus 668:
1.112 markus 669: /* We no longer need the private host keys. Clear them now. */
670: if (sensitive_data.nkeys != 0) {
671: for (i = 0; i < sensitive_data.nkeys; i++) {
672: if (sensitive_data.keys[i] != NULL) {
673: /* Destroys contents safely */
674: debug3("clear hostkey %d", i);
675: key_free(sensitive_data.keys[i]);
676: sensitive_data.keys[i] = NULL;
677: }
678: }
679: xfree(sensitive_data.keys);
1.134 markus 680: }
681: for (i = 0; i < options.num_identity_files; i++) {
682: if (options.identity_files[i]) {
683: xfree(options.identity_files[i]);
684: options.identity_files[i] = NULL;
685: }
686: if (options.identity_keys[i]) {
687: key_free(options.identity_keys[i]);
688: options.identity_keys[i] = NULL;
689: }
1.112 markus 690: }
1.31 markus 691:
1.45 markus 692: exit_status = compat20 ? ssh_session2() : ssh_session();
693: packet_close();
1.186 djm 694:
1.214 djm 695: if (options.control_path != NULL && control_fd != -1)
696: unlink(options.control_path);
697:
1.186 djm 698: /*
1.203 djm 699: * Send SIGHUP to proxy command if used. We don't wait() in
1.186 djm 700: * case it hangs and instead rely on init to reap the child
701: */
702: if (proxy_command_pid > 1)
703: kill(proxy_command_pid, SIGHUP);
704:
1.45 markus 705: return exit_status;
706: }
707:
1.202 markus 708: #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
709:
1.126 itojun 710: static void
1.150 stevesk 711: x11_get_proto(char **_proto, char **_data)
1.50 markus 712: {
1.202 markus 713: char cmd[1024];
1.50 markus 714: char line[512];
1.202 markus 715: char xdisplay[512];
1.150 stevesk 716: static char proto[512], data[512];
1.50 markus 717: FILE *f;
1.202 markus 718: int got_data = 0, generated = 0, do_unlink = 0, i;
719: char *display, *xauthdir, *xauthfile;
1.182 stevesk 720: struct stat st;
1.50 markus 721:
1.202 markus 722: xauthdir = xauthfile = NULL;
1.150 stevesk 723: *_proto = proto;
724: *_data = data;
725: proto[0] = data[0] = '\0';
1.202 markus 726:
1.182 stevesk 727: if (!options.xauth_location ||
728: (stat(options.xauth_location, &st) == -1)) {
729: debug("No xauth program.");
730: } else {
731: if ((display = getenv("DISPLAY")) == NULL) {
732: debug("x11_get_proto: DISPLAY not set");
733: return;
734: }
1.202 markus 735: /*
736: * Handle FamilyLocal case where $DISPLAY does
737: * not match an authorization entry. For this we
738: * just try "xauth list unix:displaynum.screennum".
739: * XXX: "localhost" match to determine FamilyLocal
740: * is not perfect.
741: */
742: if (strncmp(display, "localhost:", 10) == 0) {
743: snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
744: display + 10);
745: display = xdisplay;
746: }
747: if (options.forward_x11_trusted == 0) {
748: xauthdir = xmalloc(MAXPATHLEN);
749: xauthfile = xmalloc(MAXPATHLEN);
750: strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN);
751: if (mkdtemp(xauthdir) != NULL) {
752: do_unlink = 1;
753: snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile",
754: xauthdir);
755: snprintf(cmd, sizeof(cmd),
756: "%s -f %s generate %s " SSH_X11_PROTO
1.207 markus 757: " untrusted timeout 1200 2>" _PATH_DEVNULL,
1.202 markus 758: options.xauth_location, xauthfile, display);
759: debug2("x11_get_proto: %s", cmd);
760: if (system(cmd) == 0)
761: generated = 1;
762: }
763: }
764: snprintf(cmd, sizeof(cmd),
765: "%s %s%s list %s . 2>" _PATH_DEVNULL,
766: options.xauth_location,
767: generated ? "-f " : "" ,
768: generated ? xauthfile : "",
769: display);
770: debug2("x11_get_proto: %s", cmd);
771: f = popen(cmd, "r");
1.55 markus 772: if (f && fgets(line, sizeof(line), f) &&
1.150 stevesk 773: sscanf(line, "%*s %511s %511s", proto, data) == 2)
1.55 markus 774: got_data = 1;
775: if (f)
776: pclose(f);
777: }
1.202 markus 778:
779: if (do_unlink) {
780: unlink(xauthfile);
781: rmdir(xauthdir);
782: }
783: if (xauthdir)
784: xfree(xauthdir);
785: if (xauthfile)
786: xfree(xauthfile);
787:
1.50 markus 788: /*
789: * If we didn't get authentication data, just make up some
790: * data. The forwarding code will check the validity of the
791: * response anyway, and substitute this data. The X11
792: * server, however, will ignore this fake data and use
793: * whatever authentication mechanisms it was using otherwise
794: * for the local connection.
795: */
796: if (!got_data) {
797: u_int32_t rand = 0;
798:
1.202 markus 799: logit("Warning: No xauth data; "
800: "using fake authentication data for X11 forwarding.");
801: strlcpy(proto, SSH_X11_PROTO, sizeof proto);
1.50 markus 802: for (i = 0; i < 16; i++) {
803: if (i % 4 == 0)
804: rand = arc4random();
1.202 markus 805: snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
806: rand & 0xff);
1.50 markus 807: rand >>= 8;
808: }
809: }
810: }
811:
1.126 itojun 812: static void
1.70 markus 813: ssh_init_forwarding(void)
814: {
1.86 markus 815: int success = 0;
1.70 markus 816: int i;
1.86 markus 817:
1.70 markus 818: /* Initiate local TCP/IP port forwardings. */
819: for (i = 0; i < options.num_local_forwards; i++) {
820: debug("Connections to local port %d forwarded to remote address %.200s:%d",
821: options.local_forwards[i].port,
822: options.local_forwards[i].host,
823: options.local_forwards[i].host_port);
1.158 markus 824: success += channel_setup_local_fwd_listener(
1.70 markus 825: options.local_forwards[i].port,
826: options.local_forwards[i].host,
827: options.local_forwards[i].host_port,
828: options.gateway_ports);
829: }
1.86 markus 830: if (i > 0 && success == 0)
831: error("Could not request local forwarding.");
1.70 markus 832:
833: /* Initiate remote TCP/IP port forwardings. */
834: for (i = 0; i < options.num_remote_forwards; i++) {
835: debug("Connections to remote port %d forwarded to local address %.200s:%d",
836: options.remote_forwards[i].port,
837: options.remote_forwards[i].host,
838: options.remote_forwards[i].host_port);
839: channel_request_remote_forwarding(
840: options.remote_forwards[i].port,
841: options.remote_forwards[i].host,
842: options.remote_forwards[i].host_port);
843: }
844: }
845:
1.126 itojun 846: static void
1.70 markus 847: check_agent_present(void)
848: {
849: if (options.forward_agent) {
850: /* Clear agent forwarding if we don\'t have an agent. */
1.185 stevesk 851: if (!ssh_agent_present())
1.70 markus 852: options.forward_agent = 0;
853: }
854: }
855:
1.126 itojun 856: static int
1.45 markus 857: ssh_session(void)
858: {
859: int type;
860: int interactive = 0;
861: int have_tty = 0;
862: struct winsize ws;
863: char *cp;
864:
1.31 markus 865: /* Enable compression if requested. */
866: if (options.compression) {
867: debug("Requesting compression at level %d.", options.compression_level);
868:
869: if (options.compression_level < 1 || options.compression_level > 9)
870: fatal("Compression level must be from 1 (fast) to 9 (slow, best).");
871:
872: /* Send the request. */
873: packet_start(SSH_CMSG_REQUEST_COMPRESSION);
874: packet_put_int(options.compression_level);
875: packet_send();
876: packet_write_wait();
1.156 markus 877: type = packet_read();
1.31 markus 878: if (type == SSH_SMSG_SUCCESS)
879: packet_start_compression(options.compression_level);
880: else if (type == SSH_SMSG_FAILURE)
1.191 itojun 881: logit("Warning: Remote host refused compression.");
1.31 markus 882: else
883: packet_disconnect("Protocol error waiting for compression response.");
884: }
885: /* Allocate a pseudo tty if appropriate. */
886: if (tty_flag) {
887: debug("Requesting pty.");
888:
889: /* Start the packet. */
890: packet_start(SSH_CMSG_REQUEST_PTY);
891:
892: /* Store TERM in the packet. There is no limit on the
893: length of the string. */
894: cp = getenv("TERM");
895: if (!cp)
896: cp = "";
1.124 markus 897: packet_put_cstring(cp);
1.31 markus 898:
899: /* Store window size in the packet. */
900: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
901: memset(&ws, 0, sizeof(ws));
902: packet_put_int(ws.ws_row);
903: packet_put_int(ws.ws_col);
904: packet_put_int(ws.ws_xpixel);
905: packet_put_int(ws.ws_ypixel);
906:
907: /* Store tty modes in the packet. */
1.115 stevesk 908: tty_make_modes(fileno(stdin), NULL);
1.31 markus 909:
910: /* Send the packet, and wait for it to leave. */
911: packet_send();
912: packet_write_wait();
913:
914: /* Read response from the server. */
1.156 markus 915: type = packet_read();
1.43 markus 916: if (type == SSH_SMSG_SUCCESS) {
1.31 markus 917: interactive = 1;
1.45 markus 918: have_tty = 1;
1.43 markus 919: } else if (type == SSH_SMSG_FAILURE)
1.191 itojun 920: logit("Warning: Remote host failed or refused to allocate a pseudo tty.");
1.31 markus 921: else
922: packet_disconnect("Protocol error waiting for pty request response.");
923: }
924: /* Request X11 forwarding if enabled and DISPLAY is set. */
925: if (options.forward_x11 && getenv("DISPLAY") != NULL) {
1.150 stevesk 926: char *proto, *data;
1.50 markus 927: /* Get reasonable local authentication information. */
1.150 stevesk 928: x11_get_proto(&proto, &data);
1.50 markus 929: /* Request forwarding with authentication spoofing. */
1.31 markus 930: debug("Requesting X11 forwarding with authentication spoofing.");
1.50 markus 931: x11_request_forwarding_with_spoofing(0, proto, data);
1.31 markus 932:
933: /* Read response from the server. */
1.156 markus 934: type = packet_read();
1.31 markus 935: if (type == SSH_SMSG_SUCCESS) {
936: interactive = 1;
1.50 markus 937: } else if (type == SSH_SMSG_FAILURE) {
1.191 itojun 938: logit("Warning: Remote host denied X11 forwarding.");
1.50 markus 939: } else {
1.31 markus 940: packet_disconnect("Protocol error waiting for X11 forwarding");
1.50 markus 941: }
1.31 markus 942: }
943: /* Tell the packet module whether this is an interactive session. */
1.80 markus 944: packet_set_interactive(interactive);
1.31 markus 945:
946: /* Request authentication agent forwarding if appropriate. */
1.70 markus 947: check_agent_present();
948:
1.31 markus 949: if (options.forward_agent) {
950: debug("Requesting authentication agent forwarding.");
951: auth_request_forwarding();
952:
953: /* Read response from the server. */
1.156 markus 954: type = packet_read();
1.155 markus 955: packet_check_eom();
1.31 markus 956: if (type != SSH_SMSG_SUCCESS)
1.191 itojun 957: logit("Warning: Remote host denied authentication agent forwarding.");
1.31 markus 958: }
959:
1.70 markus 960: /* Initiate port forwardings. */
961: ssh_init_forwarding();
1.34 markus 962:
963: /* If requested, let ssh continue in the background. */
1.48 markus 964: if (fork_after_authentication_flag)
1.34 markus 965: if (daemon(1, 1) < 0)
966: fatal("daemon() failed: %.200s", strerror(errno));
1.31 markus 967:
1.33 markus 968: /*
969: * If a command was specified on the command line, execute the
970: * command now. Otherwise request the server to start a shell.
971: */
1.31 markus 972: if (buffer_len(&command) > 0) {
973: int len = buffer_len(&command);
974: if (len > 900)
975: len = 900;
1.152 stevesk 976: debug("Sending command: %.*s", len, (u_char *)buffer_ptr(&command));
1.31 markus 977: packet_start(SSH_CMSG_EXEC_CMD);
978: packet_put_string(buffer_ptr(&command), buffer_len(&command));
979: packet_send();
980: packet_write_wait();
981: } else {
982: debug("Requesting shell.");
983: packet_start(SSH_CMSG_EXEC_SHELL);
984: packet_send();
985: packet_write_wait();
986: }
987:
988: /* Enter the interactive session. */
1.119 stevesk 989: return client_loop(have_tty, tty_flag ?
990: options.escape_char : SSH_ESCAPECHAR_NONE, 0);
1.45 markus 991: }
992:
1.126 itojun 993: static void
1.214 djm 994: ssh_subsystem_reply(int type, u_int32_t seq, void *ctxt)
1.89 markus 995: {
996: int id, len;
997:
998: id = packet_get_int();
999: len = buffer_len(&command);
1.100 markus 1000: if (len > 900)
1001: len = 900;
1.155 markus 1002: packet_check_eom();
1.89 markus 1003: if (type == SSH2_MSG_CHANNEL_FAILURE)
1004: fatal("Request for subsystem '%.*s' failed on channel %d",
1.152 stevesk 1005: len, (u_char *)buffer_ptr(&command), id);
1.170 markus 1006: }
1007:
1008: void
1.206 markus 1009: client_global_request_reply_fwd(int type, u_int32_t seq, void *ctxt)
1.170 markus 1010: {
1011: int i;
1012:
1013: i = client_global_request_id++;
1.206 markus 1014: if (i >= options.num_remote_forwards)
1.170 markus 1015: return;
1016: debug("remote forward %s for: listen %d, connect %s:%d",
1017: type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
1018: options.remote_forwards[i].port,
1019: options.remote_forwards[i].host,
1020: options.remote_forwards[i].host_port);
1021: if (type == SSH2_MSG_REQUEST_FAILURE)
1.191 itojun 1022: logit("Warning: remote port forwarding failed for listen port %d",
1.170 markus 1023: options.remote_forwards[i].port);
1.89 markus 1024: }
1025:
1.126 itojun 1026: static void
1.214 djm 1027: ssh_control_listener(void)
1.45 markus 1028: {
1.214 djm 1029: struct sockaddr_un addr;
1030: mode_t old_umask;
1031:
1.216 djm 1032: if (options.control_path == NULL || options.control_master <= 0)
1.214 djm 1033: return;
1034:
1035: memset(&addr, '\0', sizeof(addr));
1036: addr.sun_family = AF_UNIX;
1037: addr.sun_len = offsetof(struct sockaddr_un, sun_path) +
1038: strlen(options.control_path) + 1;
1039:
1040: if (strlcpy(addr.sun_path, options.control_path,
1041: sizeof(addr.sun_path)) >= sizeof(addr.sun_path))
1042: fatal("ControlPath too long");
1043:
1044: if ((control_fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0)
1045: fatal("%s socket(): %s\n", __func__, strerror(errno));
1046:
1047: old_umask = umask(0177);
1048: if (bind(control_fd, (struct sockaddr*)&addr, addr.sun_len) == -1) {
1049: control_fd = -1;
1050: if (errno == EINVAL)
1051: fatal("ControlSocket %s already exists",
1052: options.control_path);
1053: else
1054: fatal("%s bind(): %s\n", __func__, strerror(errno));
1055: }
1056: umask(old_umask);
1.80 markus 1057:
1.214 djm 1058: if (listen(control_fd, 64) == -1)
1059: fatal("%s listen(): %s\n", __func__, strerror(errno));
1.31 markus 1060:
1.214 djm 1061: set_nonblock(control_fd);
1062: }
1.45 markus 1063:
1.214 djm 1064: /* request pty/x11/agent/tcpfwd/shell for channel */
1065: static void
1066: ssh_session2_setup(int id, void *arg)
1067: {
1.215 djm 1068: extern char **environ;
1069:
1.214 djm 1070: int interactive = tty_flag;
1071: if (options.forward_x11 && getenv("DISPLAY") != NULL) {
1.150 stevesk 1072: char *proto, *data;
1.50 markus 1073: /* Get reasonable local authentication information. */
1.150 stevesk 1074: x11_get_proto(&proto, &data);
1.50 markus 1075: /* Request forwarding with authentication spoofing. */
1076: debug("Requesting X11 forwarding with authentication spoofing.");
1077: x11_request_forwarding_with_spoofing(id, proto, data);
1.80 markus 1078: interactive = 1;
1.50 markus 1079: /* XXX wait for reply */
1080: }
1081:
1.70 markus 1082: check_agent_present();
1083: if (options.forward_agent) {
1084: debug("Requesting authentication agent forwarding.");
1085: channel_request_start(id, "auth-agent-req@openssh.com", 0);
1086: packet_send();
1.212 djm 1087: }
1088:
1.214 djm 1089: client_session2_setup(id, tty_flag, subsystem_flag, getenv("TERM"),
1.215 djm 1090: NULL, fileno(stdin), &command, environ, &ssh_subsystem_reply);
1.90 markus 1091:
1.80 markus 1092: packet_set_interactive(interactive);
1.45 markus 1093: }
1094:
1.143 markus 1095: /* open new channel for a session */
1.126 itojun 1096: static int
1.143 markus 1097: ssh_session2_open(void)
1.45 markus 1098: {
1.118 markus 1099: Channel *c;
1100: int window, packetmax, in, out, err;
1.60 markus 1101:
1.62 markus 1102: if (stdin_null_flag) {
1.93 itojun 1103: in = open(_PATH_DEVNULL, O_RDONLY);
1.62 markus 1104: } else {
1105: in = dup(STDIN_FILENO);
1106: }
1.60 markus 1107: out = dup(STDOUT_FILENO);
1108: err = dup(STDERR_FILENO);
1.45 markus 1109:
1110: if (in < 0 || out < 0 || err < 0)
1.62 markus 1111: fatal("dup() in/out/err failed");
1.45 markus 1112:
1.69 markus 1113: /* enable nonblocking unless tty */
1114: if (!isatty(in))
1115: set_nonblock(in);
1116: if (!isatty(out))
1117: set_nonblock(out);
1118: if (!isatty(err))
1119: set_nonblock(err);
1120:
1.65 markus 1121: window = CHAN_SES_WINDOW_DEFAULT;
1122: packetmax = CHAN_SES_PACKET_DEFAULT;
1.164 markus 1123: if (tty_flag) {
1124: window >>= 1;
1125: packetmax >>= 1;
1.45 markus 1126: }
1.118 markus 1127: c = channel_new(
1.45 markus 1128: "session", SSH_CHANNEL_OPENING, in, out, err,
1.65 markus 1129: window, packetmax, CHAN_EXTENDED_WRITE,
1.192 markus 1130: "client-session", /*nonblock*/0);
1.45 markus 1131:
1.143 markus 1132: debug3("ssh_session2_open: channel_new: %d", c->self);
1.106 markus 1133:
1.122 markus 1134: channel_send_open(c->self);
1.143 markus 1135: if (!no_shell_flag)
1.214 djm 1136: channel_register_confirm(c->self, ssh_session2_setup, NULL);
1.106 markus 1137:
1.118 markus 1138: return c->self;
1.106 markus 1139: }
1140:
1.126 itojun 1141: static int
1.106 markus 1142: ssh_session2(void)
1143: {
1.143 markus 1144: int id = -1;
1.106 markus 1145:
1146: /* XXX should be pre-session */
1147: ssh_init_forwarding();
1.214 djm 1148: ssh_control_listener();
1.106 markus 1149:
1.143 markus 1150: if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN))
1151: id = ssh_session2_open();
1.106 markus 1152:
1153: /* If requested, let ssh continue in the background. */
1154: if (fork_after_authentication_flag)
1155: if (daemon(1, 1) < 0)
1156: fatal("daemon() failed: %.200s", strerror(errno));
1.31 markus 1157:
1.119 stevesk 1158: return client_loop(tty_flag, tty_flag ?
1159: options.escape_char : SSH_ESCAPECHAR_NONE, id);
1.72 markus 1160: }
1161:
1.126 itojun 1162: static void
1.104 markus 1163: load_public_identity_files(void)
1164: {
1165: char *filename;
1.167 markus 1166: int i = 0;
1.104 markus 1167: Key *public;
1.167 markus 1168: #ifdef SMARTCARD
1169: Key **keys;
1.104 markus 1170:
1.133 markus 1171: if (options.smartcard_device != NULL &&
1.167 markus 1172: options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
1173: (keys = sc_get_keys(options.smartcard_device, NULL)) != NULL ) {
1174: int count = 0;
1175: for (i = 0; keys[i] != NULL; i++) {
1176: count++;
1177: memmove(&options.identity_files[1], &options.identity_files[0],
1178: sizeof(char *) * (SSH_MAX_IDENTITY_FILES - 1));
1179: memmove(&options.identity_keys[1], &options.identity_keys[0],
1180: sizeof(Key *) * (SSH_MAX_IDENTITY_FILES - 1));
1181: options.num_identity_files++;
1182: options.identity_keys[0] = keys[i];
1.194 markus 1183: options.identity_files[0] = sc_get_key_label(keys[i]);
1.167 markus 1184: }
1.168 markus 1185: if (options.num_identity_files > SSH_MAX_IDENTITY_FILES)
1186: options.num_identity_files = SSH_MAX_IDENTITY_FILES;
1.167 markus 1187: i = count;
1188: xfree(keys);
1.127 markus 1189: }
1.136 jakob 1190: #endif /* SMARTCARD */
1.131 millert 1191: for (; i < options.num_identity_files; i++) {
1192: filename = tilde_expand_filename(options.identity_files[i],
1193: original_real_uid);
1194: public = key_load_public(filename, NULL);
1195: debug("identity file %s type %d", filename,
1196: public ? public->type : -1);
1197: xfree(options.identity_files[i]);
1198: options.identity_files[i] = filename;
1199: options.identity_keys[i] = public;
1200: }
1.214 djm 1201: }
1202:
1203: static void
1204: control_client_sighandler(int signo)
1205: {
1206: control_client_terminate = signo;
1207: }
1208:
1209: static void
1210: control_client_sigrelay(int signo)
1211: {
1212: if (control_server_pid > 1)
1213: kill(control_server_pid, signo);
1214: }
1215:
1216: static void
1217: control_client(const char *path)
1218: {
1219: struct sockaddr_un addr;
1.215 djm 1220: int i, r, sock, exitval;
1.214 djm 1221: Buffer m;
1222: char *cp;
1.215 djm 1223: extern char **environ;
1.214 djm 1224:
1225: memset(&addr, '\0', sizeof(addr));
1226: addr.sun_family = AF_UNIX;
1227: addr.sun_len = offsetof(struct sockaddr_un, sun_path) +
1228: strlen(path) + 1;
1229:
1230: if (strlcpy(addr.sun_path, path,
1231: sizeof(addr.sun_path)) >= sizeof(addr.sun_path))
1232: fatal("ControlPath too long");
1233:
1234: if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) < 0)
1235: fatal("%s socket(): %s", __func__, strerror(errno));
1236:
1237: if (connect(sock, (struct sockaddr*)&addr, addr.sun_len) == -1)
1238: fatal("Couldn't connect to %s: %s", path, strerror(errno));
1239:
1240: if ((cp = getenv("TERM")) == NULL)
1241: cp = "";
1242:
1243: buffer_init(&m);
1244:
1245: /* Get PID of controlee */
1246: if (ssh_msg_recv(sock, &m) == -1)
1247: fatal("%s: msg_recv", __func__);
1248: if (buffer_get_char(&m) != 0)
1249: fatal("%s: wrong version", __func__);
1.216 djm 1250: /* Connection allowed? */
1251: if (buffer_get_int(&m) != 1)
1252: fatal("Connection to master denied");
1.214 djm 1253: control_server_pid = buffer_get_int(&m);
1254:
1255: buffer_clear(&m);
1256: buffer_put_int(&m, tty_flag);
1257: buffer_put_int(&m, subsystem_flag);
1258: buffer_put_cstring(&m, cp);
1259:
1260: buffer_append(&command, "\0", 1);
1261: buffer_put_cstring(&m, buffer_ptr(&command));
1.215 djm 1262:
1263: /* Pass environment */
1264: for (i = 0; environ != NULL && environ[i] != NULL; i++)
1265: ;
1266: buffer_put_int(&m, i);
1267: for (i = 0; environ != NULL && environ[i] != NULL; i++)
1268: buffer_put_cstring(&m, environ[i]);
1.214 djm 1269:
1270: if (ssh_msg_send(sock, /* version */0, &m) == -1)
1271: fatal("%s: msg_send", __func__);
1272:
1273: mm_send_fd(sock, STDIN_FILENO);
1274: mm_send_fd(sock, STDOUT_FILENO);
1275: mm_send_fd(sock, STDERR_FILENO);
1276:
1277: /* Wait for reply, so master has a chance to gather ttymodes */
1278: buffer_clear(&m);
1279: if (ssh_msg_recv(sock, &m) == -1)
1280: fatal("%s: msg_recv", __func__);
1281: if (buffer_get_char(&m) != 0)
1282: fatal("%s: master returned error", __func__);
1283: buffer_free(&m);
1.218 ! djm 1284:
! 1285: signal(SIGINT, control_client_sighandler);
! 1286: signal(SIGTERM, control_client_sighandler);
! 1287: signal(SIGWINCH, control_client_sigrelay);
1.214 djm 1288:
1289: if (tty_flag)
1290: enter_raw_mode();
1291:
1292: /* Stick around until the controlee closes the client_fd */
1293: exitval = 0;
1294: for (;!control_client_terminate;) {
1295: r = read(sock, &exitval, sizeof(exitval));
1296: if (r == 0) {
1297: debug2("Received EOF from master");
1298: break;
1299: }
1300: if (r > 0)
1301: debug2("Received exit status from master %d", exitval);
1302: if (r == -1 && errno != EINTR)
1303: fatal("%s: read %s", __func__, strerror(errno));
1304: }
1305:
1306: if (control_client_terminate)
1307: debug2("Exiting on signal %d", control_client_terminate);
1308:
1309: close(sock);
1310:
1311: leave_raw_mode();
1312:
1313: if (tty_flag && options.log_level != SYSLOG_LEVEL_QUIET)
1314: fprintf(stderr, "Connection to master closed.\r\n");
1315:
1316: exit(exitval);
1.1 deraadt 1317: }
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