Annotation of src/usr.bin/ssh/ssh.c, Revision 1.216
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"
1.216 ! djm 43: RCSID("$OpenBSD: ssh.c,v 1.215 2004/06/17 14:52:48 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,
156: "usage: ssh [-1246AaCfghkNnqsTtVvXxY] [-b bind_address] [-c cipher_spec]\n"
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"
159: " [-p port] [-R port:host:hostport] [user@]hostname [command]\n"
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);
1.51 markus 342: options.cipher = SSH_CIPHER_ILLEGAL;
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':
370: options.control_master = 1;
371: break;
1.31 markus 372: case 'p':
1.113 stevesk 373: options.port = a2port(optarg);
374: if (options.port == 0) {
1.109 markus 375: fprintf(stderr, "Bad port '%s'\n", optarg);
376: exit(1);
377: }
1.31 markus 378: break;
379: case 'l':
380: options.user = optarg;
381: break;
1.141 stevesk 382:
383: case 'L':
1.31 markus 384: case 'R':
1.141 stevesk 385: if (sscanf(optarg, "%5[0-9]:%255[^:]:%5[0-9]",
386: sfwd_port, buf, sfwd_host_port) != 3 &&
387: sscanf(optarg, "%5[0-9]/%255[^/]/%5[0-9]",
388: sfwd_port, buf, sfwd_host_port) != 3) {
1.128 fgsch 389: fprintf(stderr,
1.141 stevesk 390: "Bad forwarding specification '%s'\n",
1.128 fgsch 391: optarg);
1.31 markus 392: usage();
393: /* NOTREACHED */
394: }
1.141 stevesk 395: if ((fwd_port = a2port(sfwd_port)) == 0 ||
1.165 markus 396: (fwd_host_port = a2port(sfwd_host_port)) == 0) {
1.128 fgsch 397: fprintf(stderr,
1.141 stevesk 398: "Bad forwarding port(s) '%s'\n", optarg);
399: exit(1);
1.31 markus 400: }
1.141 stevesk 401: if (opt == 'L')
402: add_local_forward(&options, fwd_port, buf,
403: fwd_host_port);
404: else if (opt == 'R')
405: add_remote_forward(&options, fwd_port, buf,
1.151 deraadt 406: fwd_host_port);
1.31 markus 407: break;
1.108 markus 408:
409: case 'D':
1.113 stevesk 410: fwd_port = a2port(optarg);
411: if (fwd_port == 0) {
1.128 fgsch 412: fprintf(stderr, "Bad dynamic port '%s'\n",
413: optarg);
1.109 markus 414: exit(1);
415: }
1.200 markus 416: add_local_forward(&options, fwd_port, "socks", 0);
1.108 markus 417: break;
418:
1.31 markus 419: case 'C':
420: options.compression = 1;
421: break;
1.45 markus 422: case 'N':
423: no_shell_flag = 1;
424: no_tty_flag = 1;
425: break;
426: case 'T':
427: no_tty_flag = 1;
428: break;
1.31 markus 429: case 'o':
430: dummy = 1;
1.205 markus 431: line = xstrdup(optarg);
1.128 fgsch 432: if (process_config_line(&options, host ? host : "",
1.205 markus 433: line, "command-line", 0, &dummy) != 0)
1.31 markus 434: exit(1);
1.205 markus 435: xfree(line);
1.31 markus 436: break;
1.85 djm 437: case 's':
438: subsystem_flag = 1;
1.117 markus 439: break;
1.214 djm 440: case 'S':
441: if (options.control_path != NULL)
442: free(options.control_path);
443: options.control_path = xstrdup(optarg);
444: if (options.control_master == -1)
445: options.control_master = 0;
446: break;
1.117 markus 447: case 'b':
448: options.bind_address = optarg;
1.85 djm 449: break;
1.139 markus 450: case 'F':
451: config = optarg;
452: break;
1.31 markus 453: default:
454: usage();
1.1 deraadt 455: }
1.31 markus 456: }
457:
1.128 fgsch 458: ac -= optind;
459: av += optind;
460:
461: if (ac > 0 && !host && **av != '-') {
1.188 markus 462: if (strrchr(*av, '@')) {
1.128 fgsch 463: p = xstrdup(*av);
1.188 markus 464: cp = strrchr(p, '@');
1.128 fgsch 465: if (cp == NULL || cp == p)
466: usage();
467: options.user = p;
468: *cp = '\0';
469: host = ++cp;
470: } else
471: host = *av;
1.189 millert 472: if (ac > 1) {
473: optind = optreset = 1;
1.128 fgsch 474: goto again;
475: }
1.189 millert 476: ac--, av++;
1.128 fgsch 477: }
478:
1.31 markus 479: /* Check that we got a host name. */
480: if (!host)
481: usage();
482:
1.54 markus 483: SSLeay_add_all_algorithms();
1.72 markus 484: ERR_load_crypto_strings();
1.31 markus 485:
486: /* Initialize the command to execute on remote host. */
487: buffer_init(&command);
1.1 deraadt 488:
1.33 markus 489: /*
490: * Save the command to execute on the remote host in a buffer. There
491: * is no limit on the length of the command, except by the maximum
492: * packet size. Also sets the tty flag if there is no command.
493: */
1.128 fgsch 494: if (!ac) {
1.31 markus 495: /* No command specified - execute shell on a tty. */
496: tty_flag = 1;
1.85 djm 497: if (subsystem_flag) {
1.128 fgsch 498: fprintf(stderr,
499: "You must specify a subsystem to invoke.\n");
1.85 djm 500: usage();
501: }
1.31 markus 502: } else {
1.128 fgsch 503: /* A command has been specified. Store it into the buffer. */
504: for (i = 0; i < ac; i++) {
505: if (i)
1.31 markus 506: buffer_append(&command, " ", 1);
507: buffer_append(&command, av[i], strlen(av[i]));
508: }
509: }
510:
511: /* Cannot fork to background if no command. */
1.63 markus 512: if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag)
1.31 markus 513: fatal("Cannot fork into background without a command to execute.");
514:
515: /* Allocate a tty by default if no command specified. */
516: if (buffer_len(&command) == 0)
517: tty_flag = 1;
518:
1.180 deraadt 519: /* Force no tty */
1.75 markus 520: if (no_tty_flag)
521: tty_flag = 0;
1.31 markus 522: /* Do not allocate a tty if stdin is not a tty. */
1.79 markus 523: if (!isatty(fileno(stdin)) && !force_tty_flag) {
1.31 markus 524: if (tty_flag)
1.191 itojun 525: logit("Pseudo-terminal will not be allocated because stdin is not a terminal.");
1.31 markus 526: tty_flag = 0;
527: }
1.45 markus 528:
1.101 markus 529: /*
530: * Initialize "log" output. Since we are the client all output
531: * actually goes to stderr.
532: */
1.111 markus 533: log_init(av[0], options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level,
534: SYSLOG_FACILITY_USER, 1);
1.31 markus 535:
1.139 markus 536: /*
537: * Read per-user configuration file. Ignore the system wide config
538: * file if the user specifies a config file on the command line.
539: */
540: if (config != NULL) {
1.211 djm 541: if (!read_config_file(config, host, &options, 0))
1.142 stevesk 542: fatal("Can't open user config file %.100s: "
543: "%.100s", config, strerror(errno));
1.139 markus 544: } else {
545: snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir,
546: _PATH_SSH_USER_CONFFILE);
1.210 djm 547: (void)read_config_file(buf, host, &options, 1);
1.139 markus 548:
1.145 markus 549: /* Read systemwide configuration file after use config. */
1.210 djm 550: (void)read_config_file(_PATH_HOST_CONFIG_FILE, host,
551: &options, 0);
1.139 markus 552: }
1.31 markus 553:
554: /* Fill configuration defaults. */
555: fill_default_options(&options);
556:
1.196 djm 557: channel_set_af(options.address_family);
558:
1.31 markus 559: /* reinit */
1.101 markus 560: log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 1);
1.31 markus 561:
562: if (options.user == NULL)
563: options.user = xstrdup(pw->pw_name);
564:
565: if (options.hostname != NULL)
566: host = options.hostname;
1.195 markus 567:
568: /* force lowercase for hostkey matching */
569: if (options.host_key_alias != NULL) {
570: for (p = options.host_key_alias; *p; p++)
571: if (isupper(*p))
572: *p = tolower(*p);
573: }
1.190 markus 574:
575: if (options.proxy_command != NULL &&
576: strcmp(options.proxy_command, "none") == 0)
577: options.proxy_command = NULL;
1.31 markus 578:
1.214 djm 579: if (options.control_path != NULL) {
580: options.control_path = tilde_expand_filename(
581: options.control_path, original_real_uid);
582: }
583: if (options.control_path != NULL && options.control_master == 0)
584: control_client(options.control_path); /* This doesn't return */
585:
1.77 markus 586: /* Open a connection to the remote host. */
1.203 djm 587: if (ssh_connect(host, &hostaddr, options.port,
1.196 djm 588: options.address_family, options.connection_attempts,
1.177 markus 589: original_effective_uid == 0 && options.use_privileged_port,
1.179 markus 590: options.proxy_command) != 0)
1.178 markus 591: exit(1);
1.31 markus 592:
1.33 markus 593: /*
594: * If we successfully made the connection, load the host private key
595: * in case we will need it later for combined rsa-rhosts
596: * authentication. This must be done before releasing extra
597: * privileges, because the file is only readable by root.
1.174 markus 598: * If we cannot access the private keys, load the public keys
599: * instead and try to execute the ssh-keysign helper instead.
1.33 markus 600: */
1.112 markus 601: sensitive_data.nkeys = 0;
602: sensitive_data.keys = NULL;
1.173 markus 603: sensitive_data.external_keysign = 0;
1.178 markus 604: if (options.rhosts_rsa_authentication ||
605: options.hostbased_authentication) {
1.112 markus 606: sensitive_data.nkeys = 3;
1.180 deraadt 607: sensitive_data.keys = xmalloc(sensitive_data.nkeys *
608: sizeof(Key));
1.177 markus 609:
610: PRIV_START;
1.112 markus 611: sensitive_data.keys[0] = key_load_private_type(KEY_RSA1,
1.105 markus 612: _PATH_HOST_KEY_FILE, "", NULL);
1.112 markus 613: sensitive_data.keys[1] = key_load_private_type(KEY_DSA,
614: _PATH_HOST_DSA_KEY_FILE, "", NULL);
615: sensitive_data.keys[2] = key_load_private_type(KEY_RSA,
616: _PATH_HOST_RSA_KEY_FILE, "", NULL);
1.177 markus 617: PRIV_END;
1.173 markus 618:
1.181 markus 619: if (options.hostbased_authentication == 1 &&
620: sensitive_data.keys[0] == NULL &&
1.173 markus 621: sensitive_data.keys[1] == NULL &&
622: sensitive_data.keys[2] == NULL) {
623: sensitive_data.keys[1] = key_load_public(
624: _PATH_HOST_DSA_KEY_FILE, NULL);
625: sensitive_data.keys[2] = key_load_public(
626: _PATH_HOST_RSA_KEY_FILE, NULL);
627: sensitive_data.external_keysign = 1;
628: }
1.31 markus 629: }
1.33 markus 630: /*
631: * Get rid of any extra privileges that we may have. We will no
632: * longer need them. Also, extra privileges could make it very hard
633: * to read identity files and other non-world-readable files from the
634: * user's home directory if it happens to be on a NFS volume where
635: * root is mapped to nobody.
636: */
1.177 markus 637: seteuid(original_real_uid);
638: setuid(original_real_uid);
1.31 markus 639:
1.33 markus 640: /*
641: * Now that we are back to our own permissions, create ~/.ssh
642: * directory if it doesn\'t already exist.
643: */
1.138 jakob 644: snprintf(buf, sizeof buf, "%.100s%s%.100s", pw->pw_dir, strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR);
1.31 markus 645: if (stat(buf, &st) < 0)
1.57 djm 646: if (mkdir(buf, 0700) < 0)
1.31 markus 647: error("Could not create directory '%.200s'.", buf);
648:
1.104 markus 649: /* load options.identity_files */
650: load_public_identity_files();
651:
652: /* Expand ~ in known host file names. */
653: /* XXX mem-leaks: */
1.72 markus 654: options.system_hostfile =
655: tilde_expand_filename(options.system_hostfile, original_real_uid);
656: options.user_hostfile =
657: tilde_expand_filename(options.user_hostfile, original_real_uid);
658: options.system_hostfile2 =
659: tilde_expand_filename(options.system_hostfile2, original_real_uid);
660: options.user_hostfile2 =
661: tilde_expand_filename(options.user_hostfile2, original_real_uid);
1.149 markus 662:
663: signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
1.31 markus 664:
665: /* Log into the remote system. This never returns if the login fails. */
1.173 markus 666: ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr, pw);
1.31 markus 667:
1.112 markus 668: /* We no longer need the private host keys. Clear them now. */
669: if (sensitive_data.nkeys != 0) {
670: for (i = 0; i < sensitive_data.nkeys; i++) {
671: if (sensitive_data.keys[i] != NULL) {
672: /* Destroys contents safely */
673: debug3("clear hostkey %d", i);
674: key_free(sensitive_data.keys[i]);
675: sensitive_data.keys[i] = NULL;
676: }
677: }
678: xfree(sensitive_data.keys);
1.134 markus 679: }
680: for (i = 0; i < options.num_identity_files; i++) {
681: if (options.identity_files[i]) {
682: xfree(options.identity_files[i]);
683: options.identity_files[i] = NULL;
684: }
685: if (options.identity_keys[i]) {
686: key_free(options.identity_keys[i]);
687: options.identity_keys[i] = NULL;
688: }
1.112 markus 689: }
1.31 markus 690:
1.45 markus 691: exit_status = compat20 ? ssh_session2() : ssh_session();
692: packet_close();
1.186 djm 693:
1.214 djm 694: if (options.control_path != NULL && control_fd != -1)
695: unlink(options.control_path);
696:
1.186 djm 697: /*
1.203 djm 698: * Send SIGHUP to proxy command if used. We don't wait() in
1.186 djm 699: * case it hangs and instead rely on init to reap the child
700: */
701: if (proxy_command_pid > 1)
702: kill(proxy_command_pid, SIGHUP);
703:
1.45 markus 704: return exit_status;
705: }
706:
1.202 markus 707: #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
708:
1.126 itojun 709: static void
1.150 stevesk 710: x11_get_proto(char **_proto, char **_data)
1.50 markus 711: {
1.202 markus 712: char cmd[1024];
1.50 markus 713: char line[512];
1.202 markus 714: char xdisplay[512];
1.150 stevesk 715: static char proto[512], data[512];
1.50 markus 716: FILE *f;
1.202 markus 717: int got_data = 0, generated = 0, do_unlink = 0, i;
718: char *display, *xauthdir, *xauthfile;
1.182 stevesk 719: struct stat st;
1.50 markus 720:
1.202 markus 721: xauthdir = xauthfile = NULL;
1.150 stevesk 722: *_proto = proto;
723: *_data = data;
724: proto[0] = data[0] = '\0';
1.202 markus 725:
1.182 stevesk 726: if (!options.xauth_location ||
727: (stat(options.xauth_location, &st) == -1)) {
728: debug("No xauth program.");
729: } else {
730: if ((display = getenv("DISPLAY")) == NULL) {
731: debug("x11_get_proto: DISPLAY not set");
732: return;
733: }
1.202 markus 734: /*
735: * Handle FamilyLocal case where $DISPLAY does
736: * not match an authorization entry. For this we
737: * just try "xauth list unix:displaynum.screennum".
738: * XXX: "localhost" match to determine FamilyLocal
739: * is not perfect.
740: */
741: if (strncmp(display, "localhost:", 10) == 0) {
742: snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
743: display + 10);
744: display = xdisplay;
745: }
746: if (options.forward_x11_trusted == 0) {
747: xauthdir = xmalloc(MAXPATHLEN);
748: xauthfile = xmalloc(MAXPATHLEN);
749: strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN);
750: if (mkdtemp(xauthdir) != NULL) {
751: do_unlink = 1;
752: snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile",
753: xauthdir);
754: snprintf(cmd, sizeof(cmd),
755: "%s -f %s generate %s " SSH_X11_PROTO
1.207 markus 756: " untrusted timeout 1200 2>" _PATH_DEVNULL,
1.202 markus 757: options.xauth_location, xauthfile, display);
758: debug2("x11_get_proto: %s", cmd);
759: if (system(cmd) == 0)
760: generated = 1;
761: }
762: }
763: snprintf(cmd, sizeof(cmd),
764: "%s %s%s list %s . 2>" _PATH_DEVNULL,
765: options.xauth_location,
766: generated ? "-f " : "" ,
767: generated ? xauthfile : "",
768: display);
769: debug2("x11_get_proto: %s", cmd);
770: f = popen(cmd, "r");
1.55 markus 771: if (f && fgets(line, sizeof(line), f) &&
1.150 stevesk 772: sscanf(line, "%*s %511s %511s", proto, data) == 2)
1.55 markus 773: got_data = 1;
774: if (f)
775: pclose(f);
776: }
1.202 markus 777:
778: if (do_unlink) {
779: unlink(xauthfile);
780: rmdir(xauthdir);
781: }
782: if (xauthdir)
783: xfree(xauthdir);
784: if (xauthfile)
785: xfree(xauthfile);
786:
1.50 markus 787: /*
788: * If we didn't get authentication data, just make up some
789: * data. The forwarding code will check the validity of the
790: * response anyway, and substitute this data. The X11
791: * server, however, will ignore this fake data and use
792: * whatever authentication mechanisms it was using otherwise
793: * for the local connection.
794: */
795: if (!got_data) {
796: u_int32_t rand = 0;
797:
1.202 markus 798: logit("Warning: No xauth data; "
799: "using fake authentication data for X11 forwarding.");
800: strlcpy(proto, SSH_X11_PROTO, sizeof proto);
1.50 markus 801: for (i = 0; i < 16; i++) {
802: if (i % 4 == 0)
803: rand = arc4random();
1.202 markus 804: snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
805: rand & 0xff);
1.50 markus 806: rand >>= 8;
807: }
808: }
809: }
810:
1.126 itojun 811: static void
1.70 markus 812: ssh_init_forwarding(void)
813: {
1.86 markus 814: int success = 0;
1.70 markus 815: int i;
1.86 markus 816:
1.70 markus 817: /* Initiate local TCP/IP port forwardings. */
818: for (i = 0; i < options.num_local_forwards; i++) {
819: debug("Connections to local port %d forwarded to remote address %.200s:%d",
820: options.local_forwards[i].port,
821: options.local_forwards[i].host,
822: options.local_forwards[i].host_port);
1.158 markus 823: success += channel_setup_local_fwd_listener(
1.70 markus 824: options.local_forwards[i].port,
825: options.local_forwards[i].host,
826: options.local_forwards[i].host_port,
827: options.gateway_ports);
828: }
1.86 markus 829: if (i > 0 && success == 0)
830: error("Could not request local forwarding.");
1.70 markus 831:
832: /* Initiate remote TCP/IP port forwardings. */
833: for (i = 0; i < options.num_remote_forwards; i++) {
834: debug("Connections to remote port %d forwarded to local address %.200s:%d",
835: options.remote_forwards[i].port,
836: options.remote_forwards[i].host,
837: options.remote_forwards[i].host_port);
838: channel_request_remote_forwarding(
839: options.remote_forwards[i].port,
840: options.remote_forwards[i].host,
841: options.remote_forwards[i].host_port);
842: }
843: }
844:
1.126 itojun 845: static void
1.70 markus 846: check_agent_present(void)
847: {
848: if (options.forward_agent) {
849: /* Clear agent forwarding if we don\'t have an agent. */
1.185 stevesk 850: if (!ssh_agent_present())
1.70 markus 851: options.forward_agent = 0;
852: }
853: }
854:
1.126 itojun 855: static int
1.45 markus 856: ssh_session(void)
857: {
858: int type;
859: int interactive = 0;
860: int have_tty = 0;
861: struct winsize ws;
862: char *cp;
863:
1.31 markus 864: /* Enable compression if requested. */
865: if (options.compression) {
866: debug("Requesting compression at level %d.", options.compression_level);
867:
868: if (options.compression_level < 1 || options.compression_level > 9)
869: fatal("Compression level must be from 1 (fast) to 9 (slow, best).");
870:
871: /* Send the request. */
872: packet_start(SSH_CMSG_REQUEST_COMPRESSION);
873: packet_put_int(options.compression_level);
874: packet_send();
875: packet_write_wait();
1.156 markus 876: type = packet_read();
1.31 markus 877: if (type == SSH_SMSG_SUCCESS)
878: packet_start_compression(options.compression_level);
879: else if (type == SSH_SMSG_FAILURE)
1.191 itojun 880: logit("Warning: Remote host refused compression.");
1.31 markus 881: else
882: packet_disconnect("Protocol error waiting for compression response.");
883: }
884: /* Allocate a pseudo tty if appropriate. */
885: if (tty_flag) {
886: debug("Requesting pty.");
887:
888: /* Start the packet. */
889: packet_start(SSH_CMSG_REQUEST_PTY);
890:
891: /* Store TERM in the packet. There is no limit on the
892: length of the string. */
893: cp = getenv("TERM");
894: if (!cp)
895: cp = "";
1.124 markus 896: packet_put_cstring(cp);
1.31 markus 897:
898: /* Store window size in the packet. */
899: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
900: memset(&ws, 0, sizeof(ws));
901: packet_put_int(ws.ws_row);
902: packet_put_int(ws.ws_col);
903: packet_put_int(ws.ws_xpixel);
904: packet_put_int(ws.ws_ypixel);
905:
906: /* Store tty modes in the packet. */
1.115 stevesk 907: tty_make_modes(fileno(stdin), NULL);
1.31 markus 908:
909: /* Send the packet, and wait for it to leave. */
910: packet_send();
911: packet_write_wait();
912:
913: /* Read response from the server. */
1.156 markus 914: type = packet_read();
1.43 markus 915: if (type == SSH_SMSG_SUCCESS) {
1.31 markus 916: interactive = 1;
1.45 markus 917: have_tty = 1;
1.43 markus 918: } else if (type == SSH_SMSG_FAILURE)
1.191 itojun 919: logit("Warning: Remote host failed or refused to allocate a pseudo tty.");
1.31 markus 920: else
921: packet_disconnect("Protocol error waiting for pty request response.");
922: }
923: /* Request X11 forwarding if enabled and DISPLAY is set. */
924: if (options.forward_x11 && getenv("DISPLAY") != NULL) {
1.150 stevesk 925: char *proto, *data;
1.50 markus 926: /* Get reasonable local authentication information. */
1.150 stevesk 927: x11_get_proto(&proto, &data);
1.50 markus 928: /* Request forwarding with authentication spoofing. */
1.31 markus 929: debug("Requesting X11 forwarding with authentication spoofing.");
1.50 markus 930: x11_request_forwarding_with_spoofing(0, proto, data);
1.31 markus 931:
932: /* Read response from the server. */
1.156 markus 933: type = packet_read();
1.31 markus 934: if (type == SSH_SMSG_SUCCESS) {
935: interactive = 1;
1.50 markus 936: } else if (type == SSH_SMSG_FAILURE) {
1.191 itojun 937: logit("Warning: Remote host denied X11 forwarding.");
1.50 markus 938: } else {
1.31 markus 939: packet_disconnect("Protocol error waiting for X11 forwarding");
1.50 markus 940: }
1.31 markus 941: }
942: /* Tell the packet module whether this is an interactive session. */
1.80 markus 943: packet_set_interactive(interactive);
1.31 markus 944:
945: /* Request authentication agent forwarding if appropriate. */
1.70 markus 946: check_agent_present();
947:
1.31 markus 948: if (options.forward_agent) {
949: debug("Requesting authentication agent forwarding.");
950: auth_request_forwarding();
951:
952: /* Read response from the server. */
1.156 markus 953: type = packet_read();
1.155 markus 954: packet_check_eom();
1.31 markus 955: if (type != SSH_SMSG_SUCCESS)
1.191 itojun 956: logit("Warning: Remote host denied authentication agent forwarding.");
1.31 markus 957: }
958:
1.70 markus 959: /* Initiate port forwardings. */
960: ssh_init_forwarding();
1.34 markus 961:
962: /* If requested, let ssh continue in the background. */
1.48 markus 963: if (fork_after_authentication_flag)
1.34 markus 964: if (daemon(1, 1) < 0)
965: fatal("daemon() failed: %.200s", strerror(errno));
1.31 markus 966:
1.33 markus 967: /*
968: * If a command was specified on the command line, execute the
969: * command now. Otherwise request the server to start a shell.
970: */
1.31 markus 971: if (buffer_len(&command) > 0) {
972: int len = buffer_len(&command);
973: if (len > 900)
974: len = 900;
1.152 stevesk 975: debug("Sending command: %.*s", len, (u_char *)buffer_ptr(&command));
1.31 markus 976: packet_start(SSH_CMSG_EXEC_CMD);
977: packet_put_string(buffer_ptr(&command), buffer_len(&command));
978: packet_send();
979: packet_write_wait();
980: } else {
981: debug("Requesting shell.");
982: packet_start(SSH_CMSG_EXEC_SHELL);
983: packet_send();
984: packet_write_wait();
985: }
986:
987: /* Enter the interactive session. */
1.119 stevesk 988: return client_loop(have_tty, tty_flag ?
989: options.escape_char : SSH_ESCAPECHAR_NONE, 0);
1.45 markus 990: }
991:
1.126 itojun 992: static void
1.214 djm 993: ssh_subsystem_reply(int type, u_int32_t seq, void *ctxt)
1.89 markus 994: {
995: int id, len;
996:
997: id = packet_get_int();
998: len = buffer_len(&command);
1.100 markus 999: if (len > 900)
1000: len = 900;
1.155 markus 1001: packet_check_eom();
1.89 markus 1002: if (type == SSH2_MSG_CHANNEL_FAILURE)
1003: fatal("Request for subsystem '%.*s' failed on channel %d",
1.152 stevesk 1004: len, (u_char *)buffer_ptr(&command), id);
1.170 markus 1005: }
1006:
1007: void
1.206 markus 1008: client_global_request_reply_fwd(int type, u_int32_t seq, void *ctxt)
1.170 markus 1009: {
1010: int i;
1011:
1012: i = client_global_request_id++;
1.206 markus 1013: if (i >= options.num_remote_forwards)
1.170 markus 1014: return;
1015: debug("remote forward %s for: listen %d, connect %s:%d",
1016: type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
1017: options.remote_forwards[i].port,
1018: options.remote_forwards[i].host,
1019: options.remote_forwards[i].host_port);
1020: if (type == SSH2_MSG_REQUEST_FAILURE)
1.191 itojun 1021: logit("Warning: remote port forwarding failed for listen port %d",
1.170 markus 1022: options.remote_forwards[i].port);
1.89 markus 1023: }
1024:
1.126 itojun 1025: static void
1.214 djm 1026: ssh_control_listener(void)
1.45 markus 1027: {
1.214 djm 1028: struct sockaddr_un addr;
1029: mode_t old_umask;
1030:
1.216 ! djm 1031: if (options.control_path == NULL || options.control_master <= 0)
1.214 djm 1032: return;
1033:
1034: memset(&addr, '\0', sizeof(addr));
1035: addr.sun_family = AF_UNIX;
1036: addr.sun_len = offsetof(struct sockaddr_un, sun_path) +
1037: strlen(options.control_path) + 1;
1038:
1039: if (strlcpy(addr.sun_path, options.control_path,
1040: sizeof(addr.sun_path)) >= sizeof(addr.sun_path))
1041: fatal("ControlPath too long");
1042:
1043: if ((control_fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0)
1044: fatal("%s socket(): %s\n", __func__, strerror(errno));
1045:
1046: old_umask = umask(0177);
1047: if (bind(control_fd, (struct sockaddr*)&addr, addr.sun_len) == -1) {
1048: control_fd = -1;
1049: if (errno == EINVAL)
1050: fatal("ControlSocket %s already exists",
1051: options.control_path);
1052: else
1053: fatal("%s bind(): %s\n", __func__, strerror(errno));
1054: }
1055: umask(old_umask);
1.80 markus 1056:
1.214 djm 1057: if (listen(control_fd, 64) == -1)
1058: fatal("%s listen(): %s\n", __func__, strerror(errno));
1.31 markus 1059:
1.214 djm 1060: set_nonblock(control_fd);
1061: }
1.45 markus 1062:
1.214 djm 1063: /* request pty/x11/agent/tcpfwd/shell for channel */
1064: static void
1065: ssh_session2_setup(int id, void *arg)
1066: {
1.215 djm 1067: extern char **environ;
1068:
1.214 djm 1069: int interactive = tty_flag;
1070: if (options.forward_x11 && getenv("DISPLAY") != NULL) {
1.150 stevesk 1071: char *proto, *data;
1.50 markus 1072: /* Get reasonable local authentication information. */
1.150 stevesk 1073: x11_get_proto(&proto, &data);
1.50 markus 1074: /* Request forwarding with authentication spoofing. */
1075: debug("Requesting X11 forwarding with authentication spoofing.");
1076: x11_request_forwarding_with_spoofing(id, proto, data);
1.80 markus 1077: interactive = 1;
1.50 markus 1078: /* XXX wait for reply */
1079: }
1080:
1.70 markus 1081: check_agent_present();
1082: if (options.forward_agent) {
1083: debug("Requesting authentication agent forwarding.");
1084: channel_request_start(id, "auth-agent-req@openssh.com", 0);
1085: packet_send();
1.212 djm 1086: }
1087:
1.214 djm 1088: client_session2_setup(id, tty_flag, subsystem_flag, getenv("TERM"),
1.215 djm 1089: NULL, fileno(stdin), &command, environ, &ssh_subsystem_reply);
1.90 markus 1090:
1.80 markus 1091: packet_set_interactive(interactive);
1.45 markus 1092: }
1093:
1.143 markus 1094: /* open new channel for a session */
1.126 itojun 1095: static int
1.143 markus 1096: ssh_session2_open(void)
1.45 markus 1097: {
1.118 markus 1098: Channel *c;
1099: int window, packetmax, in, out, err;
1.60 markus 1100:
1.62 markus 1101: if (stdin_null_flag) {
1.93 itojun 1102: in = open(_PATH_DEVNULL, O_RDONLY);
1.62 markus 1103: } else {
1104: in = dup(STDIN_FILENO);
1105: }
1.60 markus 1106: out = dup(STDOUT_FILENO);
1107: err = dup(STDERR_FILENO);
1.45 markus 1108:
1109: if (in < 0 || out < 0 || err < 0)
1.62 markus 1110: fatal("dup() in/out/err failed");
1.45 markus 1111:
1.69 markus 1112: /* enable nonblocking unless tty */
1113: if (!isatty(in))
1114: set_nonblock(in);
1115: if (!isatty(out))
1116: set_nonblock(out);
1117: if (!isatty(err))
1118: set_nonblock(err);
1119:
1.65 markus 1120: window = CHAN_SES_WINDOW_DEFAULT;
1121: packetmax = CHAN_SES_PACKET_DEFAULT;
1.164 markus 1122: if (tty_flag) {
1123: window >>= 1;
1124: packetmax >>= 1;
1.45 markus 1125: }
1.118 markus 1126: c = channel_new(
1.45 markus 1127: "session", SSH_CHANNEL_OPENING, in, out, err,
1.65 markus 1128: window, packetmax, CHAN_EXTENDED_WRITE,
1.192 markus 1129: "client-session", /*nonblock*/0);
1.45 markus 1130:
1.143 markus 1131: debug3("ssh_session2_open: channel_new: %d", c->self);
1.106 markus 1132:
1.122 markus 1133: channel_send_open(c->self);
1.143 markus 1134: if (!no_shell_flag)
1.214 djm 1135: channel_register_confirm(c->self, ssh_session2_setup, NULL);
1.106 markus 1136:
1.118 markus 1137: return c->self;
1.106 markus 1138: }
1139:
1.126 itojun 1140: static int
1.106 markus 1141: ssh_session2(void)
1142: {
1.143 markus 1143: int id = -1;
1.106 markus 1144:
1145: /* XXX should be pre-session */
1146: ssh_init_forwarding();
1.214 djm 1147: ssh_control_listener();
1.106 markus 1148:
1.143 markus 1149: if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN))
1150: id = ssh_session2_open();
1.106 markus 1151:
1152: /* If requested, let ssh continue in the background. */
1153: if (fork_after_authentication_flag)
1154: if (daemon(1, 1) < 0)
1155: fatal("daemon() failed: %.200s", strerror(errno));
1.31 markus 1156:
1.119 stevesk 1157: return client_loop(tty_flag, tty_flag ?
1158: options.escape_char : SSH_ESCAPECHAR_NONE, id);
1.72 markus 1159: }
1160:
1.126 itojun 1161: static void
1.104 markus 1162: load_public_identity_files(void)
1163: {
1164: char *filename;
1.167 markus 1165: int i = 0;
1.104 markus 1166: Key *public;
1.167 markus 1167: #ifdef SMARTCARD
1168: Key **keys;
1.104 markus 1169:
1.133 markus 1170: if (options.smartcard_device != NULL &&
1.167 markus 1171: options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
1172: (keys = sc_get_keys(options.smartcard_device, NULL)) != NULL ) {
1173: int count = 0;
1174: for (i = 0; keys[i] != NULL; i++) {
1175: count++;
1176: memmove(&options.identity_files[1], &options.identity_files[0],
1177: sizeof(char *) * (SSH_MAX_IDENTITY_FILES - 1));
1178: memmove(&options.identity_keys[1], &options.identity_keys[0],
1179: sizeof(Key *) * (SSH_MAX_IDENTITY_FILES - 1));
1180: options.num_identity_files++;
1181: options.identity_keys[0] = keys[i];
1.194 markus 1182: options.identity_files[0] = sc_get_key_label(keys[i]);
1.167 markus 1183: }
1.168 markus 1184: if (options.num_identity_files > SSH_MAX_IDENTITY_FILES)
1185: options.num_identity_files = SSH_MAX_IDENTITY_FILES;
1.167 markus 1186: i = count;
1187: xfree(keys);
1.127 markus 1188: }
1.136 jakob 1189: #endif /* SMARTCARD */
1.131 millert 1190: for (; i < options.num_identity_files; i++) {
1191: filename = tilde_expand_filename(options.identity_files[i],
1192: original_real_uid);
1193: public = key_load_public(filename, NULL);
1194: debug("identity file %s type %d", filename,
1195: public ? public->type : -1);
1196: xfree(options.identity_files[i]);
1197: options.identity_files[i] = filename;
1198: options.identity_keys[i] = public;
1199: }
1.214 djm 1200: }
1201:
1202: static void
1203: control_client_sighandler(int signo)
1204: {
1205: control_client_terminate = signo;
1206: }
1207:
1208: static void
1209: control_client_sigrelay(int signo)
1210: {
1211: if (control_server_pid > 1)
1212: kill(control_server_pid, signo);
1213: }
1214:
1215: static void
1216: control_client(const char *path)
1217: {
1218: struct sockaddr_un addr;
1.215 djm 1219: int i, r, sock, exitval;
1.214 djm 1220: Buffer m;
1221: char *cp;
1.215 djm 1222: extern char **environ;
1.214 djm 1223:
1224: memset(&addr, '\0', sizeof(addr));
1225: addr.sun_family = AF_UNIX;
1226: addr.sun_len = offsetof(struct sockaddr_un, sun_path) +
1227: strlen(path) + 1;
1228:
1229: if (strlcpy(addr.sun_path, path,
1230: sizeof(addr.sun_path)) >= sizeof(addr.sun_path))
1231: fatal("ControlPath too long");
1232:
1233: if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) < 0)
1234: fatal("%s socket(): %s", __func__, strerror(errno));
1235:
1236: if (connect(sock, (struct sockaddr*)&addr, addr.sun_len) == -1)
1237: fatal("Couldn't connect to %s: %s", path, strerror(errno));
1238:
1239: if ((cp = getenv("TERM")) == NULL)
1240: cp = "";
1241:
1242: signal(SIGINT, control_client_sighandler);
1243: signal(SIGTERM, control_client_sighandler);
1244: signal(SIGWINCH, control_client_sigrelay);
1245:
1246: buffer_init(&m);
1247:
1248: /* Get PID of controlee */
1249: if (ssh_msg_recv(sock, &m) == -1)
1250: fatal("%s: msg_recv", __func__);
1251: if (buffer_get_char(&m) != 0)
1252: fatal("%s: wrong version", __func__);
1.216 ! djm 1253: /* Connection allowed? */
! 1254: if (buffer_get_int(&m) != 1)
! 1255: fatal("Connection to master denied");
1.214 djm 1256: control_server_pid = buffer_get_int(&m);
1257:
1258: buffer_clear(&m);
1259: buffer_put_int(&m, tty_flag);
1260: buffer_put_int(&m, subsystem_flag);
1261: buffer_put_cstring(&m, cp);
1262:
1263: buffer_append(&command, "\0", 1);
1264: buffer_put_cstring(&m, buffer_ptr(&command));
1.215 djm 1265:
1266: /* Pass environment */
1267: for (i = 0; environ != NULL && environ[i] != NULL; i++)
1268: ;
1269: buffer_put_int(&m, i);
1270: for (i = 0; environ != NULL && environ[i] != NULL; i++)
1271: buffer_put_cstring(&m, environ[i]);
1.214 djm 1272:
1273: if (ssh_msg_send(sock, /* version */0, &m) == -1)
1274: fatal("%s: msg_send", __func__);
1275:
1276: mm_send_fd(sock, STDIN_FILENO);
1277: mm_send_fd(sock, STDOUT_FILENO);
1278: mm_send_fd(sock, STDERR_FILENO);
1279:
1280: /* Wait for reply, so master has a chance to gather ttymodes */
1281: buffer_clear(&m);
1282: if (ssh_msg_recv(sock, &m) == -1)
1283: fatal("%s: msg_recv", __func__);
1284: if (buffer_get_char(&m) != 0)
1285: fatal("%s: master returned error", __func__);
1286: buffer_free(&m);
1287:
1288: if (tty_flag)
1289: enter_raw_mode();
1290:
1291: /* Stick around until the controlee closes the client_fd */
1292: exitval = 0;
1293: for (;!control_client_terminate;) {
1294: r = read(sock, &exitval, sizeof(exitval));
1295: if (r == 0) {
1296: debug2("Received EOF from master");
1297: break;
1298: }
1299: if (r > 0)
1300: debug2("Received exit status from master %d", exitval);
1301: if (r == -1 && errno != EINTR)
1302: fatal("%s: read %s", __func__, strerror(errno));
1303: }
1304:
1305: if (control_client_terminate)
1306: debug2("Exiting on signal %d", control_client_terminate);
1307:
1308: close(sock);
1309:
1310: leave_raw_mode();
1311:
1312: if (tty_flag && options.log_level != SYSLOG_LEVEL_QUIET)
1313: fprintf(stderr, "Connection to master closed.\r\n");
1314:
1315: exit(exitval);
1.1 deraadt 1316: }
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