Annotation of src/usr.bin/ssh/ssh.c, Revision 1.224
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"
1.224 ! markus 43: RCSID("$OpenBSD: ssh.c,v 1.223 2004/07/11 17:48:47 deraadt 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"
1.219 markus 159: " [-p port] [-R port:host:hostport] [-S ctl] [user@]hostname [command]\n"
1.208 markus 160: );
1.31 markus 161: exit(1);
1.1 deraadt 162: }
163:
1.126 itojun 164: static int ssh_session(void);
165: static int ssh_session2(void);
166: static void load_public_identity_files(void);
1.214 djm 167: static void control_client(const char *path);
1.45 markus 168:
1.32 deraadt 169: /*
170: * Main program for the ssh client.
171: */
1.2 provos 172: int
173: main(int ac, char **av)
1.1 deraadt 174: {
1.178 markus 175: int i, opt, exit_status;
1.35 markus 176: u_short fwd_port, fwd_host_port;
1.141 stevesk 177: char sfwd_port[6], sfwd_host_port[6];
1.205 markus 178: char *p, *cp, *line, buf[256];
1.31 markus 179: struct stat st;
1.98 markus 180: struct passwd *pw;
1.45 markus 181: int dummy;
1.144 stevesk 182: extern int optind, optreset;
183: extern char *optarg;
1.31 markus 184:
1.33 markus 185: /*
186: * Save the original real uid. It will be needed later (uid-swapping
187: * may clobber the real uid).
188: */
1.31 markus 189: original_real_uid = getuid();
190: original_effective_uid = geteuid();
191:
1.184 stevesk 192: /*
193: * Use uid-swapping to give up root privileges for the duration of
194: * option processing. We will re-instantiate the rights when we are
195: * ready to create the privileged port, and will permanently drop
196: * them when the port has been created (actually, when the connection
197: * has been made, as we may need to create the port several times).
198: */
199: PRIV_END;
200:
1.31 markus 201: /* If we are installed setuid root be careful to not drop core. */
202: if (original_real_uid != original_effective_uid) {
203: struct rlimit rlim;
204: rlim.rlim_cur = rlim.rlim_max = 0;
205: if (setrlimit(RLIMIT_CORE, &rlim) < 0)
206: fatal("setrlimit failed: %.100s", strerror(errno));
1.1 deraadt 207: }
1.107 markus 208: /* Get user data. */
209: pw = getpwuid(original_real_uid);
210: if (!pw) {
1.191 itojun 211: logit("You don't exist, go away!");
1.107 markus 212: exit(1);
213: }
214: /* Take a copy of the returned structure. */
215: pw = pwcopy(pw);
1.31 markus 216:
1.33 markus 217: /*
218: * Set our umask to something reasonable, as some files are created
219: * with the default umask. This will make them world-readable but
220: * writable only by the owner, which is ok for all files for which we
221: * don't set the modes explicitly.
222: */
1.31 markus 223: umask(022);
224:
225: /* Initialize option structure to indicate that no values have been set. */
226: initialize_options(&options);
227:
228: /* Parse command-line arguments. */
229: host = NULL;
230:
1.128 fgsch 231: again:
232: while ((opt = getopt(ac, av,
1.214 djm 233: "1246ab:c:e:fgi:kl:m:no:p:qstvxACD:F:I:L:MNPR:S:TVXY")) != -1) {
1.31 markus 234: switch (opt) {
1.91 jakob 235: case '1':
236: options.protocol = SSH_PROTO_1;
237: break;
1.47 markus 238: case '2':
239: options.protocol = SSH_PROTO_2;
240: break;
1.37 markus 241: case '4':
1.196 djm 242: options.address_family = AF_INET;
1.37 markus 243: break;
244: case '6':
1.196 djm 245: options.address_family = AF_INET6;
1.37 markus 246: break;
1.31 markus 247: case 'n':
248: stdin_null_flag = 1;
249: break;
250: case 'f':
251: fork_after_authentication_flag = 1;
252: stdin_null_flag = 1;
253: break;
254: case 'x':
255: options.forward_x11 = 0;
256: break;
257: case 'X':
258: options.forward_x11 = 1;
259: break;
1.202 markus 260: case 'Y':
261: options.forward_x11 = 1;
262: options.forward_x11_trusted = 1;
263: break;
1.31 markus 264: case 'g':
265: options.gateway_ports = 1;
266: break;
1.183 stevesk 267: case 'P': /* deprecated */
1.31 markus 268: options.use_privileged_port = 0;
269: break;
270: case 'a':
271: options.forward_agent = 0;
1.53 markus 272: break;
273: case 'A':
274: options.forward_agent = 1;
1.31 markus 275: break;
276: case 'k':
1.204 dtucker 277: options.gss_deleg_creds = 0;
1.31 markus 278: break;
279: case 'i':
280: if (stat(optarg, &st) < 0) {
1.128 fgsch 281: fprintf(stderr, "Warning: Identity file %s "
282: "does not exist.\n", optarg);
1.31 markus 283: break;
284: }
1.128 fgsch 285: if (options.num_identity_files >=
286: SSH_MAX_IDENTITY_FILES)
287: fatal("Too many identity files specified "
288: "(max %d)", SSH_MAX_IDENTITY_FILES);
289: options.identity_files[options.num_identity_files++] =
290: xstrdup(optarg);
1.31 markus 291: break;
1.127 markus 292: case 'I':
293: #ifdef SMARTCARD
1.133 markus 294: options.smartcard_device = xstrdup(optarg);
1.137 jakob 295: #else
1.127 markus 296: fprintf(stderr, "no support for smartcards.\n");
1.137 jakob 297: #endif
1.127 markus 298: break;
1.31 markus 299: case 't':
1.79 markus 300: if (tty_flag)
301: force_tty_flag = 1;
1.31 markus 302: tty_flag = 1;
303: break;
304: case 'v':
1.197 markus 305: if (debug_flag == 0) {
1.66 markus 306: debug_flag = 1;
307: options.log_level = SYSLOG_LEVEL_DEBUG1;
1.197 markus 308: } else {
309: if (options.log_level < SYSLOG_LEVEL_DEBUG3)
310: options.log_level++;
1.66 markus 311: break;
1.197 markus 312: }
1.66 markus 313: /* fallthrough */
1.31 markus 314: case 'V':
1.209 markus 315: fprintf(stderr, "%s, %s\n",
316: SSH_VERSION, SSLeay_version(SSLEAY_VERSION));
1.31 markus 317: if (opt == 'V')
318: exit(0);
319: break;
320: case 'q':
321: options.log_level = SYSLOG_LEVEL_QUIET;
322: break;
323: case 'e':
324: if (optarg[0] == '^' && optarg[2] == 0 &&
1.128 fgsch 325: (u_char) optarg[1] >= 64 &&
326: (u_char) optarg[1] < 128)
1.78 markus 327: options.escape_char = (u_char) optarg[1] & 31;
1.31 markus 328: else if (strlen(optarg) == 1)
1.78 markus 329: options.escape_char = (u_char) optarg[0];
1.31 markus 330: else if (strcmp(optarg, "none") == 0)
1.119 stevesk 331: options.escape_char = SSH_ESCAPECHAR_NONE;
1.31 markus 332: else {
1.128 fgsch 333: fprintf(stderr, "Bad escape character '%s'.\n",
334: optarg);
1.31 markus 335: exit(1);
336: }
337: break;
338: case 'c':
1.49 markus 339: if (ciphers_valid(optarg)) {
340: /* SSH2 only */
341: options.ciphers = xstrdup(optarg);
1.224 ! markus 342: options.cipher = SSH_CIPHER_INVALID;
1.49 markus 343: } else {
344: /* SSH1 only */
1.74 markus 345: options.cipher = cipher_number(optarg);
346: if (options.cipher == -1) {
1.128 fgsch 347: fprintf(stderr,
348: "Unknown cipher type '%s'\n",
349: optarg);
1.49 markus 350: exit(1);
351: }
1.128 fgsch 352: if (options.cipher == SSH_CIPHER_3DES)
1.74 markus 353: options.ciphers = "3des-cbc";
1.128 fgsch 354: else if (options.cipher == SSH_CIPHER_BLOWFISH)
1.74 markus 355: options.ciphers = "blowfish-cbc";
1.128 fgsch 356: else
1.74 markus 357: options.ciphers = (char *)-1;
1.95 markus 358: }
359: break;
360: case 'm':
361: if (mac_valid(optarg))
362: options.macs = xstrdup(optarg);
363: else {
1.128 fgsch 364: fprintf(stderr, "Unknown mac type '%s'\n",
365: optarg);
1.95 markus 366: exit(1);
1.31 markus 367: }
368: break;
1.214 djm 369: case 'M':
1.219 markus 370: options.control_master =
371: (options.control_master >= 1) ? 2 : 1;
1.214 djm 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: break;
1.117 markus 446: case 'b':
447: options.bind_address = optarg;
1.85 djm 448: break;
1.139 markus 449: case 'F':
450: config = optarg;
451: break;
1.31 markus 452: default:
453: usage();
1.1 deraadt 454: }
1.31 markus 455: }
456:
1.128 fgsch 457: ac -= optind;
458: av += optind;
459:
460: if (ac > 0 && !host && **av != '-') {
1.188 markus 461: if (strrchr(*av, '@')) {
1.128 fgsch 462: p = xstrdup(*av);
1.188 markus 463: cp = strrchr(p, '@');
1.128 fgsch 464: if (cp == NULL || cp == p)
465: usage();
466: options.user = p;
467: *cp = '\0';
468: host = ++cp;
469: } else
470: host = *av;
1.189 millert 471: if (ac > 1) {
472: optind = optreset = 1;
1.128 fgsch 473: goto again;
474: }
1.189 millert 475: ac--, av++;
1.128 fgsch 476: }
477:
1.31 markus 478: /* Check that we got a host name. */
479: if (!host)
480: usage();
481:
1.54 markus 482: SSLeay_add_all_algorithms();
1.72 markus 483: ERR_load_crypto_strings();
1.31 markus 484:
485: /* Initialize the command to execute on remote host. */
486: buffer_init(&command);
1.1 deraadt 487:
1.33 markus 488: /*
489: * Save the command to execute on the remote host in a buffer. There
490: * is no limit on the length of the command, except by the maximum
491: * packet size. Also sets the tty flag if there is no command.
492: */
1.128 fgsch 493: if (!ac) {
1.31 markus 494: /* No command specified - execute shell on a tty. */
495: tty_flag = 1;
1.85 djm 496: if (subsystem_flag) {
1.128 fgsch 497: fprintf(stderr,
498: "You must specify a subsystem to invoke.\n");
1.85 djm 499: usage();
500: }
1.31 markus 501: } else {
1.128 fgsch 502: /* A command has been specified. Store it into the buffer. */
503: for (i = 0; i < ac; i++) {
504: if (i)
1.31 markus 505: buffer_append(&command, " ", 1);
506: buffer_append(&command, av[i], strlen(av[i]));
507: }
508: }
509:
510: /* Cannot fork to background if no command. */
1.63 markus 511: if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag)
1.31 markus 512: fatal("Cannot fork into background without a command to execute.");
513:
514: /* Allocate a tty by default if no command specified. */
515: if (buffer_len(&command) == 0)
516: tty_flag = 1;
517:
1.180 deraadt 518: /* Force no tty */
1.75 markus 519: if (no_tty_flag)
520: tty_flag = 0;
1.31 markus 521: /* Do not allocate a tty if stdin is not a tty. */
1.79 markus 522: if (!isatty(fileno(stdin)) && !force_tty_flag) {
1.31 markus 523: if (tty_flag)
1.191 itojun 524: logit("Pseudo-terminal will not be allocated because stdin is not a terminal.");
1.31 markus 525: tty_flag = 0;
526: }
1.45 markus 527:
1.101 markus 528: /*
529: * Initialize "log" output. Since we are the client all output
530: * actually goes to stderr.
531: */
1.111 markus 532: log_init(av[0], options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level,
533: SYSLOG_FACILITY_USER, 1);
1.31 markus 534:
1.139 markus 535: /*
536: * Read per-user configuration file. Ignore the system wide config
537: * file if the user specifies a config file on the command line.
538: */
539: if (config != NULL) {
1.211 djm 540: if (!read_config_file(config, host, &options, 0))
1.142 stevesk 541: fatal("Can't open user config file %.100s: "
542: "%.100s", config, strerror(errno));
1.139 markus 543: } else {
544: snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir,
545: _PATH_SSH_USER_CONFFILE);
1.210 djm 546: (void)read_config_file(buf, host, &options, 1);
1.139 markus 547:
1.145 markus 548: /* Read systemwide configuration file after use config. */
1.223 deraadt 549: (void)read_config_file(_PATH_HOST_CONFIG_FILE, host,
1.210 djm 550: &options, 0);
1.139 markus 551: }
1.31 markus 552:
553: /* Fill configuration defaults. */
554: fill_default_options(&options);
555:
1.196 djm 556: channel_set_af(options.address_family);
557:
1.31 markus 558: /* reinit */
1.101 markus 559: log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 1);
1.31 markus 560:
561: if (options.user == NULL)
562: options.user = xstrdup(pw->pw_name);
563:
564: if (options.hostname != NULL)
565: host = options.hostname;
1.195 markus 566:
567: /* force lowercase for hostkey matching */
568: if (options.host_key_alias != NULL) {
569: for (p = options.host_key_alias; *p; p++)
570: if (isupper(*p))
571: *p = tolower(*p);
572: }
1.190 markus 573:
574: if (options.proxy_command != NULL &&
575: strcmp(options.proxy_command, "none") == 0)
576: options.proxy_command = NULL;
1.31 markus 577:
1.214 djm 578: if (options.control_path != NULL) {
579: options.control_path = tilde_expand_filename(
580: options.control_path, original_real_uid);
581: }
582: if (options.control_path != NULL && options.control_master == 0)
583: control_client(options.control_path); /* This doesn't return */
584:
1.77 markus 585: /* Open a connection to the remote host. */
1.203 djm 586: if (ssh_connect(host, &hostaddr, options.port,
1.196 djm 587: options.address_family, options.connection_attempts,
1.177 markus 588: original_effective_uid == 0 && options.use_privileged_port,
1.179 markus 589: options.proxy_command) != 0)
1.178 markus 590: exit(1);
1.31 markus 591:
1.33 markus 592: /*
593: * If we successfully made the connection, load the host private key
594: * in case we will need it later for combined rsa-rhosts
595: * authentication. This must be done before releasing extra
596: * privileges, because the file is only readable by root.
1.174 markus 597: * If we cannot access the private keys, load the public keys
598: * instead and try to execute the ssh-keysign helper instead.
1.33 markus 599: */
1.112 markus 600: sensitive_data.nkeys = 0;
601: sensitive_data.keys = NULL;
1.173 markus 602: sensitive_data.external_keysign = 0;
1.178 markus 603: if (options.rhosts_rsa_authentication ||
604: options.hostbased_authentication) {
1.112 markus 605: sensitive_data.nkeys = 3;
1.180 deraadt 606: sensitive_data.keys = xmalloc(sensitive_data.nkeys *
607: sizeof(Key));
1.177 markus 608:
609: PRIV_START;
1.112 markus 610: sensitive_data.keys[0] = key_load_private_type(KEY_RSA1,
1.105 markus 611: _PATH_HOST_KEY_FILE, "", NULL);
1.112 markus 612: sensitive_data.keys[1] = key_load_private_type(KEY_DSA,
613: _PATH_HOST_DSA_KEY_FILE, "", NULL);
614: sensitive_data.keys[2] = key_load_private_type(KEY_RSA,
615: _PATH_HOST_RSA_KEY_FILE, "", NULL);
1.177 markus 616: PRIV_END;
1.173 markus 617:
1.181 markus 618: if (options.hostbased_authentication == 1 &&
619: sensitive_data.keys[0] == NULL &&
1.173 markus 620: sensitive_data.keys[1] == NULL &&
621: sensitive_data.keys[2] == NULL) {
622: sensitive_data.keys[1] = key_load_public(
623: _PATH_HOST_DSA_KEY_FILE, NULL);
624: sensitive_data.keys[2] = key_load_public(
625: _PATH_HOST_RSA_KEY_FILE, NULL);
626: sensitive_data.external_keysign = 1;
627: }
1.31 markus 628: }
1.33 markus 629: /*
630: * Get rid of any extra privileges that we may have. We will no
631: * longer need them. Also, extra privileges could make it very hard
632: * to read identity files and other non-world-readable files from the
633: * user's home directory if it happens to be on a NFS volume where
634: * root is mapped to nobody.
635: */
1.177 markus 636: seteuid(original_real_uid);
637: setuid(original_real_uid);
1.31 markus 638:
1.33 markus 639: /*
640: * Now that we are back to our own permissions, create ~/.ssh
641: * directory if it doesn\'t already exist.
642: */
1.138 jakob 643: snprintf(buf, sizeof buf, "%.100s%s%.100s", pw->pw_dir, strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR);
1.31 markus 644: if (stat(buf, &st) < 0)
1.57 djm 645: if (mkdir(buf, 0700) < 0)
1.31 markus 646: error("Could not create directory '%.200s'.", buf);
647:
1.104 markus 648: /* load options.identity_files */
649: load_public_identity_files();
650:
651: /* Expand ~ in known host file names. */
652: /* XXX mem-leaks: */
1.72 markus 653: options.system_hostfile =
654: tilde_expand_filename(options.system_hostfile, original_real_uid);
655: options.user_hostfile =
656: tilde_expand_filename(options.user_hostfile, original_real_uid);
657: options.system_hostfile2 =
658: tilde_expand_filename(options.system_hostfile2, original_real_uid);
659: options.user_hostfile2 =
660: tilde_expand_filename(options.user_hostfile2, original_real_uid);
1.149 markus 661:
662: signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
1.31 markus 663:
664: /* Log into the remote system. This never returns if the login fails. */
1.173 markus 665: ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr, pw);
1.31 markus 666:
1.112 markus 667: /* We no longer need the private host keys. Clear them now. */
668: if (sensitive_data.nkeys != 0) {
669: for (i = 0; i < sensitive_data.nkeys; i++) {
670: if (sensitive_data.keys[i] != NULL) {
671: /* Destroys contents safely */
672: debug3("clear hostkey %d", i);
673: key_free(sensitive_data.keys[i]);
674: sensitive_data.keys[i] = NULL;
675: }
676: }
677: xfree(sensitive_data.keys);
1.134 markus 678: }
679: for (i = 0; i < options.num_identity_files; i++) {
680: if (options.identity_files[i]) {
681: xfree(options.identity_files[i]);
682: options.identity_files[i] = NULL;
683: }
684: if (options.identity_keys[i]) {
685: key_free(options.identity_keys[i]);
686: options.identity_keys[i] = NULL;
687: }
1.112 markus 688: }
1.31 markus 689:
1.45 markus 690: exit_status = compat20 ? ssh_session2() : ssh_session();
691: packet_close();
1.186 djm 692:
1.214 djm 693: if (options.control_path != NULL && control_fd != -1)
694: unlink(options.control_path);
695:
1.186 djm 696: /*
1.203 djm 697: * Send SIGHUP to proxy command if used. We don't wait() in
1.186 djm 698: * case it hangs and instead rely on init to reap the child
699: */
700: if (proxy_command_pid > 1)
701: kill(proxy_command_pid, SIGHUP);
702:
1.45 markus 703: return exit_status;
704: }
705:
1.202 markus 706: #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
707:
1.126 itojun 708: static void
1.150 stevesk 709: x11_get_proto(char **_proto, char **_data)
1.50 markus 710: {
1.202 markus 711: char cmd[1024];
1.50 markus 712: char line[512];
1.202 markus 713: char xdisplay[512];
1.150 stevesk 714: static char proto[512], data[512];
1.50 markus 715: FILE *f;
1.202 markus 716: int got_data = 0, generated = 0, do_unlink = 0, i;
717: char *display, *xauthdir, *xauthfile;
1.182 stevesk 718: struct stat st;
1.50 markus 719:
1.202 markus 720: xauthdir = xauthfile = NULL;
1.150 stevesk 721: *_proto = proto;
722: *_data = data;
723: proto[0] = data[0] = '\0';
1.202 markus 724:
1.182 stevesk 725: if (!options.xauth_location ||
726: (stat(options.xauth_location, &st) == -1)) {
727: debug("No xauth program.");
728: } else {
729: if ((display = getenv("DISPLAY")) == NULL) {
730: debug("x11_get_proto: DISPLAY not set");
731: return;
732: }
1.202 markus 733: /*
734: * Handle FamilyLocal case where $DISPLAY does
735: * not match an authorization entry. For this we
736: * just try "xauth list unix:displaynum.screennum".
737: * XXX: "localhost" match to determine FamilyLocal
738: * is not perfect.
739: */
740: if (strncmp(display, "localhost:", 10) == 0) {
741: snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
742: display + 10);
743: display = xdisplay;
744: }
745: if (options.forward_x11_trusted == 0) {
746: xauthdir = xmalloc(MAXPATHLEN);
747: xauthfile = xmalloc(MAXPATHLEN);
748: strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN);
749: if (mkdtemp(xauthdir) != NULL) {
750: do_unlink = 1;
751: snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile",
752: xauthdir);
753: snprintf(cmd, sizeof(cmd),
754: "%s -f %s generate %s " SSH_X11_PROTO
1.207 markus 755: " untrusted timeout 1200 2>" _PATH_DEVNULL,
1.202 markus 756: options.xauth_location, xauthfile, display);
757: debug2("x11_get_proto: %s", cmd);
758: if (system(cmd) == 0)
759: generated = 1;
760: }
761: }
762: snprintf(cmd, sizeof(cmd),
763: "%s %s%s list %s . 2>" _PATH_DEVNULL,
764: options.xauth_location,
765: generated ? "-f " : "" ,
766: generated ? xauthfile : "",
767: display);
768: debug2("x11_get_proto: %s", cmd);
769: f = popen(cmd, "r");
1.55 markus 770: if (f && fgets(line, sizeof(line), f) &&
1.150 stevesk 771: sscanf(line, "%*s %511s %511s", proto, data) == 2)
1.55 markus 772: got_data = 1;
773: if (f)
774: pclose(f);
775: }
1.202 markus 776:
777: if (do_unlink) {
778: unlink(xauthfile);
779: rmdir(xauthdir);
780: }
781: if (xauthdir)
782: xfree(xauthdir);
783: if (xauthfile)
784: xfree(xauthfile);
785:
1.50 markus 786: /*
787: * If we didn't get authentication data, just make up some
788: * data. The forwarding code will check the validity of the
789: * response anyway, and substitute this data. The X11
790: * server, however, will ignore this fake data and use
791: * whatever authentication mechanisms it was using otherwise
792: * for the local connection.
793: */
794: if (!got_data) {
1.221 avsm 795: u_int32_t rnd = 0;
1.50 markus 796:
1.202 markus 797: logit("Warning: No xauth data; "
798: "using fake authentication data for X11 forwarding.");
799: strlcpy(proto, SSH_X11_PROTO, sizeof proto);
1.50 markus 800: for (i = 0; i < 16; i++) {
801: if (i % 4 == 0)
1.221 avsm 802: rnd = arc4random();
1.202 markus 803: snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
1.221 avsm 804: rnd & 0xff);
805: rnd >>= 8;
1.50 markus 806: }
807: }
808: }
809:
1.126 itojun 810: static void
1.70 markus 811: ssh_init_forwarding(void)
812: {
1.86 markus 813: int success = 0;
1.70 markus 814: int i;
1.86 markus 815:
1.70 markus 816: /* Initiate local TCP/IP port forwardings. */
817: for (i = 0; i < options.num_local_forwards; i++) {
818: debug("Connections to local port %d forwarded to remote address %.200s:%d",
819: options.local_forwards[i].port,
820: options.local_forwards[i].host,
821: options.local_forwards[i].host_port);
1.158 markus 822: success += channel_setup_local_fwd_listener(
1.70 markus 823: options.local_forwards[i].port,
824: options.local_forwards[i].host,
825: options.local_forwards[i].host_port,
826: options.gateway_ports);
827: }
1.86 markus 828: if (i > 0 && success == 0)
829: error("Could not request local forwarding.");
1.70 markus 830:
831: /* Initiate remote TCP/IP port forwardings. */
832: for (i = 0; i < options.num_remote_forwards; i++) {
833: debug("Connections to remote port %d forwarded to local address %.200s:%d",
834: options.remote_forwards[i].port,
835: options.remote_forwards[i].host,
836: options.remote_forwards[i].host_port);
837: channel_request_remote_forwarding(
838: options.remote_forwards[i].port,
839: options.remote_forwards[i].host,
840: options.remote_forwards[i].host_port);
841: }
842: }
843:
1.126 itojun 844: static void
1.70 markus 845: check_agent_present(void)
846: {
847: if (options.forward_agent) {
848: /* Clear agent forwarding if we don\'t have an agent. */
1.185 stevesk 849: if (!ssh_agent_present())
1.70 markus 850: options.forward_agent = 0;
851: }
852: }
853:
1.126 itojun 854: static int
1.45 markus 855: ssh_session(void)
856: {
857: int type;
858: int interactive = 0;
859: int have_tty = 0;
860: struct winsize ws;
861: char *cp;
862:
1.31 markus 863: /* Enable compression if requested. */
864: if (options.compression) {
865: debug("Requesting compression at level %d.", options.compression_level);
866:
867: if (options.compression_level < 1 || options.compression_level > 9)
868: fatal("Compression level must be from 1 (fast) to 9 (slow, best).");
869:
870: /* Send the request. */
871: packet_start(SSH_CMSG_REQUEST_COMPRESSION);
872: packet_put_int(options.compression_level);
873: packet_send();
874: packet_write_wait();
1.156 markus 875: type = packet_read();
1.31 markus 876: if (type == SSH_SMSG_SUCCESS)
877: packet_start_compression(options.compression_level);
878: else if (type == SSH_SMSG_FAILURE)
1.191 itojun 879: logit("Warning: Remote host refused compression.");
1.31 markus 880: else
881: packet_disconnect("Protocol error waiting for compression response.");
882: }
883: /* Allocate a pseudo tty if appropriate. */
884: if (tty_flag) {
885: debug("Requesting pty.");
886:
887: /* Start the packet. */
888: packet_start(SSH_CMSG_REQUEST_PTY);
889:
890: /* Store TERM in the packet. There is no limit on the
891: length of the string. */
892: cp = getenv("TERM");
893: if (!cp)
894: cp = "";
1.124 markus 895: packet_put_cstring(cp);
1.31 markus 896:
897: /* Store window size in the packet. */
898: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
899: memset(&ws, 0, sizeof(ws));
900: packet_put_int(ws.ws_row);
901: packet_put_int(ws.ws_col);
902: packet_put_int(ws.ws_xpixel);
903: packet_put_int(ws.ws_ypixel);
904:
905: /* Store tty modes in the packet. */
1.115 stevesk 906: tty_make_modes(fileno(stdin), NULL);
1.31 markus 907:
908: /* Send the packet, and wait for it to leave. */
909: packet_send();
910: packet_write_wait();
911:
912: /* Read response from the server. */
1.156 markus 913: type = packet_read();
1.43 markus 914: if (type == SSH_SMSG_SUCCESS) {
1.31 markus 915: interactive = 1;
1.45 markus 916: have_tty = 1;
1.43 markus 917: } else if (type == SSH_SMSG_FAILURE)
1.191 itojun 918: logit("Warning: Remote host failed or refused to allocate a pseudo tty.");
1.31 markus 919: else
920: packet_disconnect("Protocol error waiting for pty request response.");
921: }
922: /* Request X11 forwarding if enabled and DISPLAY is set. */
923: if (options.forward_x11 && getenv("DISPLAY") != NULL) {
1.150 stevesk 924: char *proto, *data;
1.50 markus 925: /* Get reasonable local authentication information. */
1.150 stevesk 926: x11_get_proto(&proto, &data);
1.50 markus 927: /* Request forwarding with authentication spoofing. */
1.31 markus 928: debug("Requesting X11 forwarding with authentication spoofing.");
1.50 markus 929: x11_request_forwarding_with_spoofing(0, proto, data);
1.31 markus 930:
931: /* Read response from the server. */
1.156 markus 932: type = packet_read();
1.31 markus 933: if (type == SSH_SMSG_SUCCESS) {
934: interactive = 1;
1.50 markus 935: } else if (type == SSH_SMSG_FAILURE) {
1.191 itojun 936: logit("Warning: Remote host denied X11 forwarding.");
1.50 markus 937: } else {
1.31 markus 938: packet_disconnect("Protocol error waiting for X11 forwarding");
1.50 markus 939: }
1.31 markus 940: }
941: /* Tell the packet module whether this is an interactive session. */
1.80 markus 942: packet_set_interactive(interactive);
1.31 markus 943:
944: /* Request authentication agent forwarding if appropriate. */
1.70 markus 945: check_agent_present();
946:
1.31 markus 947: if (options.forward_agent) {
948: debug("Requesting authentication agent forwarding.");
949: auth_request_forwarding();
950:
951: /* Read response from the server. */
1.156 markus 952: type = packet_read();
1.155 markus 953: packet_check_eom();
1.31 markus 954: if (type != SSH_SMSG_SUCCESS)
1.191 itojun 955: logit("Warning: Remote host denied authentication agent forwarding.");
1.31 markus 956: }
957:
1.70 markus 958: /* Initiate port forwardings. */
959: ssh_init_forwarding();
1.34 markus 960:
961: /* If requested, let ssh continue in the background. */
1.48 markus 962: if (fork_after_authentication_flag)
1.34 markus 963: if (daemon(1, 1) < 0)
964: fatal("daemon() failed: %.200s", strerror(errno));
1.31 markus 965:
1.33 markus 966: /*
967: * If a command was specified on the command line, execute the
968: * command now. Otherwise request the server to start a shell.
969: */
1.31 markus 970: if (buffer_len(&command) > 0) {
971: int len = buffer_len(&command);
972: if (len > 900)
973: len = 900;
1.152 stevesk 974: debug("Sending command: %.*s", len, (u_char *)buffer_ptr(&command));
1.31 markus 975: packet_start(SSH_CMSG_EXEC_CMD);
976: packet_put_string(buffer_ptr(&command), buffer_len(&command));
977: packet_send();
978: packet_write_wait();
979: } else {
980: debug("Requesting shell.");
981: packet_start(SSH_CMSG_EXEC_SHELL);
982: packet_send();
983: packet_write_wait();
984: }
985:
986: /* Enter the interactive session. */
1.119 stevesk 987: return client_loop(have_tty, tty_flag ?
988: options.escape_char : SSH_ESCAPECHAR_NONE, 0);
1.45 markus 989: }
990:
1.126 itojun 991: static void
1.214 djm 992: ssh_subsystem_reply(int type, u_int32_t seq, void *ctxt)
1.89 markus 993: {
994: int id, len;
995:
996: id = packet_get_int();
997: len = buffer_len(&command);
1.100 markus 998: if (len > 900)
999: len = 900;
1.155 markus 1000: packet_check_eom();
1.89 markus 1001: if (type == SSH2_MSG_CHANNEL_FAILURE)
1002: fatal("Request for subsystem '%.*s' failed on channel %d",
1.152 stevesk 1003: len, (u_char *)buffer_ptr(&command), id);
1.170 markus 1004: }
1005:
1006: void
1.206 markus 1007: client_global_request_reply_fwd(int type, u_int32_t seq, void *ctxt)
1.170 markus 1008: {
1009: int i;
1010:
1011: i = client_global_request_id++;
1.206 markus 1012: if (i >= options.num_remote_forwards)
1.170 markus 1013: return;
1014: debug("remote forward %s for: listen %d, connect %s:%d",
1015: type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
1016: options.remote_forwards[i].port,
1017: options.remote_forwards[i].host,
1018: options.remote_forwards[i].host_port);
1019: if (type == SSH2_MSG_REQUEST_FAILURE)
1.191 itojun 1020: logit("Warning: remote port forwarding failed for listen port %d",
1.170 markus 1021: options.remote_forwards[i].port);
1.89 markus 1022: }
1023:
1.126 itojun 1024: static void
1.214 djm 1025: ssh_control_listener(void)
1.45 markus 1026: {
1.214 djm 1027: struct sockaddr_un addr;
1028: mode_t old_umask;
1.223 deraadt 1029:
1.216 djm 1030: if (options.control_path == NULL || options.control_master <= 0)
1.214 djm 1031: return;
1032:
1033: memset(&addr, '\0', sizeof(addr));
1034: addr.sun_family = AF_UNIX;
1035: addr.sun_len = offsetof(struct sockaddr_un, sun_path) +
1036: strlen(options.control_path) + 1;
1037:
1038: if (strlcpy(addr.sun_path, options.control_path,
1039: sizeof(addr.sun_path)) >= sizeof(addr.sun_path))
1040: fatal("ControlPath too long");
1041:
1042: if ((control_fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0)
1043: fatal("%s socket(): %s\n", __func__, strerror(errno));
1044:
1045: old_umask = umask(0177);
1046: if (bind(control_fd, (struct sockaddr*)&addr, addr.sun_len) == -1) {
1047: control_fd = -1;
1048: if (errno == EINVAL)
1049: fatal("ControlSocket %s already exists",
1050: options.control_path);
1051: else
1052: fatal("%s bind(): %s\n", __func__, strerror(errno));
1053: }
1054: umask(old_umask);
1.80 markus 1055:
1.214 djm 1056: if (listen(control_fd, 64) == -1)
1057: fatal("%s listen(): %s\n", __func__, strerror(errno));
1.31 markus 1058:
1.214 djm 1059: set_nonblock(control_fd);
1060: }
1.45 markus 1061:
1.214 djm 1062: /* request pty/x11/agent/tcpfwd/shell for channel */
1063: static void
1064: ssh_session2_setup(int id, void *arg)
1065: {
1.215 djm 1066: extern char **environ;
1067:
1.214 djm 1068: int interactive = tty_flag;
1069: if (options.forward_x11 && getenv("DISPLAY") != NULL) {
1.150 stevesk 1070: char *proto, *data;
1.50 markus 1071: /* Get reasonable local authentication information. */
1.150 stevesk 1072: x11_get_proto(&proto, &data);
1.50 markus 1073: /* Request forwarding with authentication spoofing. */
1074: debug("Requesting X11 forwarding with authentication spoofing.");
1075: x11_request_forwarding_with_spoofing(id, proto, data);
1.80 markus 1076: interactive = 1;
1.50 markus 1077: /* XXX wait for reply */
1078: }
1079:
1.70 markus 1080: check_agent_present();
1081: if (options.forward_agent) {
1082: debug("Requesting authentication agent forwarding.");
1083: channel_request_start(id, "auth-agent-req@openssh.com", 0);
1084: packet_send();
1.212 djm 1085: }
1086:
1.214 djm 1087: client_session2_setup(id, tty_flag, subsystem_flag, getenv("TERM"),
1.215 djm 1088: NULL, fileno(stdin), &command, environ, &ssh_subsystem_reply);
1.90 markus 1089:
1.80 markus 1090: packet_set_interactive(interactive);
1.45 markus 1091: }
1092:
1.143 markus 1093: /* open new channel for a session */
1.126 itojun 1094: static int
1.143 markus 1095: ssh_session2_open(void)
1.45 markus 1096: {
1.118 markus 1097: Channel *c;
1098: int window, packetmax, in, out, err;
1.60 markus 1099:
1.62 markus 1100: if (stdin_null_flag) {
1.93 itojun 1101: in = open(_PATH_DEVNULL, O_RDONLY);
1.62 markus 1102: } else {
1103: in = dup(STDIN_FILENO);
1104: }
1.60 markus 1105: out = dup(STDOUT_FILENO);
1106: err = dup(STDERR_FILENO);
1.45 markus 1107:
1108: if (in < 0 || out < 0 || err < 0)
1.62 markus 1109: fatal("dup() in/out/err failed");
1.45 markus 1110:
1.69 markus 1111: /* enable nonblocking unless tty */
1112: if (!isatty(in))
1113: set_nonblock(in);
1114: if (!isatty(out))
1115: set_nonblock(out);
1116: if (!isatty(err))
1117: set_nonblock(err);
1118:
1.65 markus 1119: window = CHAN_SES_WINDOW_DEFAULT;
1120: packetmax = CHAN_SES_PACKET_DEFAULT;
1.164 markus 1121: if (tty_flag) {
1122: window >>= 1;
1123: packetmax >>= 1;
1.45 markus 1124: }
1.118 markus 1125: c = channel_new(
1.45 markus 1126: "session", SSH_CHANNEL_OPENING, in, out, err,
1.65 markus 1127: window, packetmax, CHAN_EXTENDED_WRITE,
1.192 markus 1128: "client-session", /*nonblock*/0);
1.45 markus 1129:
1.143 markus 1130: debug3("ssh_session2_open: channel_new: %d", c->self);
1.106 markus 1131:
1.122 markus 1132: channel_send_open(c->self);
1.143 markus 1133: if (!no_shell_flag)
1.214 djm 1134: channel_register_confirm(c->self, ssh_session2_setup, NULL);
1.106 markus 1135:
1.118 markus 1136: return c->self;
1.106 markus 1137: }
1138:
1.126 itojun 1139: static int
1.106 markus 1140: ssh_session2(void)
1141: {
1.143 markus 1142: int id = -1;
1.106 markus 1143:
1144: /* XXX should be pre-session */
1145: ssh_init_forwarding();
1.214 djm 1146: ssh_control_listener();
1.106 markus 1147:
1.143 markus 1148: if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN))
1149: id = ssh_session2_open();
1.106 markus 1150:
1151: /* If requested, let ssh continue in the background. */
1152: if (fork_after_authentication_flag)
1153: if (daemon(1, 1) < 0)
1154: fatal("daemon() failed: %.200s", strerror(errno));
1.31 markus 1155:
1.119 stevesk 1156: return client_loop(tty_flag, tty_flag ?
1157: options.escape_char : SSH_ESCAPECHAR_NONE, id);
1.72 markus 1158: }
1159:
1.126 itojun 1160: static void
1.104 markus 1161: load_public_identity_files(void)
1162: {
1163: char *filename;
1.167 markus 1164: int i = 0;
1.104 markus 1165: Key *public;
1.167 markus 1166: #ifdef SMARTCARD
1167: Key **keys;
1.104 markus 1168:
1.133 markus 1169: if (options.smartcard_device != NULL &&
1.167 markus 1170: options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
1171: (keys = sc_get_keys(options.smartcard_device, NULL)) != NULL ) {
1172: int count = 0;
1173: for (i = 0; keys[i] != NULL; i++) {
1174: count++;
1175: memmove(&options.identity_files[1], &options.identity_files[0],
1176: sizeof(char *) * (SSH_MAX_IDENTITY_FILES - 1));
1177: memmove(&options.identity_keys[1], &options.identity_keys[0],
1178: sizeof(Key *) * (SSH_MAX_IDENTITY_FILES - 1));
1179: options.num_identity_files++;
1180: options.identity_keys[0] = keys[i];
1.194 markus 1181: options.identity_files[0] = sc_get_key_label(keys[i]);
1.167 markus 1182: }
1.168 markus 1183: if (options.num_identity_files > SSH_MAX_IDENTITY_FILES)
1184: options.num_identity_files = SSH_MAX_IDENTITY_FILES;
1.167 markus 1185: i = count;
1186: xfree(keys);
1.127 markus 1187: }
1.136 jakob 1188: #endif /* SMARTCARD */
1.131 millert 1189: for (; i < options.num_identity_files; i++) {
1190: filename = tilde_expand_filename(options.identity_files[i],
1191: original_real_uid);
1192: public = key_load_public(filename, NULL);
1193: debug("identity file %s type %d", filename,
1194: public ? public->type : -1);
1195: xfree(options.identity_files[i]);
1196: options.identity_files[i] = filename;
1197: options.identity_keys[i] = public;
1198: }
1.214 djm 1199: }
1200:
1201: static void
1202: control_client_sighandler(int signo)
1203: {
1204: control_client_terminate = signo;
1205: }
1206:
1207: static void
1208: control_client_sigrelay(int signo)
1209: {
1210: if (control_server_pid > 1)
1211: kill(control_server_pid, signo);
1212: }
1213:
1.220 djm 1214: static int
1215: env_permitted(char *env)
1216: {
1217: int i;
1218: char name[1024], *cp;
1219:
1220: strlcpy(name, env, sizeof(name));
1221: if ((cp = strchr(name, '=')) == NULL)
1222: return (0);
1223:
1224: *cp = '\0';
1225:
1226: for (i = 0; i < options.num_send_env; i++)
1227: if (match_pattern(name, options.send_env[i]))
1228: return (1);
1229:
1230: return (0);
1231: }
1232:
1.214 djm 1233: static void
1234: control_client(const char *path)
1235: {
1236: struct sockaddr_un addr;
1.220 djm 1237: int i, r, sock, exitval, num_env;
1.214 djm 1238: Buffer m;
1239: char *cp;
1.215 djm 1240: extern char **environ;
1.223 deraadt 1241:
1.214 djm 1242: memset(&addr, '\0', sizeof(addr));
1243: addr.sun_family = AF_UNIX;
1244: addr.sun_len = offsetof(struct sockaddr_un, sun_path) +
1245: strlen(path) + 1;
1246:
1247: if (strlcpy(addr.sun_path, path,
1248: sizeof(addr.sun_path)) >= sizeof(addr.sun_path))
1249: fatal("ControlPath too long");
1250:
1251: if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) < 0)
1252: fatal("%s socket(): %s", __func__, strerror(errno));
1253:
1254: if (connect(sock, (struct sockaddr*)&addr, addr.sun_len) == -1)
1255: fatal("Couldn't connect to %s: %s", path, strerror(errno));
1256:
1257: if ((cp = getenv("TERM")) == NULL)
1258: cp = "";
1259:
1260: buffer_init(&m);
1261:
1262: /* Get PID of controlee */
1263: if (ssh_msg_recv(sock, &m) == -1)
1264: fatal("%s: msg_recv", __func__);
1265: if (buffer_get_char(&m) != 0)
1266: fatal("%s: wrong version", __func__);
1.216 djm 1267: /* Connection allowed? */
1268: if (buffer_get_int(&m) != 1)
1269: fatal("Connection to master denied");
1.214 djm 1270: control_server_pid = buffer_get_int(&m);
1271:
1272: buffer_clear(&m);
1273: buffer_put_int(&m, tty_flag);
1274: buffer_put_int(&m, subsystem_flag);
1275: buffer_put_cstring(&m, cp);
1276:
1277: buffer_append(&command, "\0", 1);
1278: buffer_put_cstring(&m, buffer_ptr(&command));
1.215 djm 1279:
1.220 djm 1280: if (options.num_send_env == 0 || environ == NULL) {
1281: buffer_put_int(&m, 0);
1.223 deraadt 1282: } else {
1.220 djm 1283: /* Pass environment */
1284: num_env = 0;
1285: for (i = 0; environ[i] != NULL; i++)
1286: if (env_permitted(environ[i]))
1287: num_env++; /* Count */
1.223 deraadt 1288:
1.220 djm 1289: buffer_put_int(&m, num_env);
1290:
1.222 dtucker 1291: for (i = 0; environ[i] != NULL && num_env >= 0; i++)
1292: if (env_permitted(environ[i])) {
1293: num_env--;
1.220 djm 1294: buffer_put_cstring(&m, environ[i]);
1.222 dtucker 1295: }
1.220 djm 1296: }
1.214 djm 1297:
1298: if (ssh_msg_send(sock, /* version */0, &m) == -1)
1299: fatal("%s: msg_send", __func__);
1300:
1301: mm_send_fd(sock, STDIN_FILENO);
1302: mm_send_fd(sock, STDOUT_FILENO);
1303: mm_send_fd(sock, STDERR_FILENO);
1304:
1305: /* Wait for reply, so master has a chance to gather ttymodes */
1306: buffer_clear(&m);
1307: if (ssh_msg_recv(sock, &m) == -1)
1308: fatal("%s: msg_recv", __func__);
1309: if (buffer_get_char(&m) != 0)
1310: fatal("%s: master returned error", __func__);
1311: buffer_free(&m);
1.218 djm 1312:
1313: signal(SIGINT, control_client_sighandler);
1314: signal(SIGTERM, control_client_sighandler);
1315: signal(SIGWINCH, control_client_sigrelay);
1.214 djm 1316:
1317: if (tty_flag)
1318: enter_raw_mode();
1319:
1320: /* Stick around until the controlee closes the client_fd */
1321: exitval = 0;
1322: for (;!control_client_terminate;) {
1323: r = read(sock, &exitval, sizeof(exitval));
1324: if (r == 0) {
1325: debug2("Received EOF from master");
1326: break;
1327: }
1328: if (r > 0)
1329: debug2("Received exit status from master %d", exitval);
1330: if (r == -1 && errno != EINTR)
1331: fatal("%s: read %s", __func__, strerror(errno));
1332: }
1333:
1334: if (control_client_terminate)
1335: debug2("Exiting on signal %d", control_client_terminate);
1336:
1337: close(sock);
1338:
1339: leave_raw_mode();
1340:
1341: if (tty_flag && options.log_level != SYSLOG_LEVEL_QUIET)
1342: fprintf(stderr, "Connection to master closed.\r\n");
1343:
1344: exit(exitval);
1.1 deraadt 1345: }
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