Annotation of src/usr.bin/ssh/ssh.c, Revision 1.312
1.312 ! djm 1: /* $OpenBSD: ssh.c,v 1.311 2008/05/08 13:06:11 djm Exp $ */
1.1 deraadt 2: /*
1.32 deraadt 3: * Author: Tatu Ylonen <ylo@cs.hut.fi>
4: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5: * All rights reserved
6: * Ssh client program. This program can be used to log into a remote machine.
7: * The software supports strong authentication, encryption, and forwarding
8: * of X11, TCP/IP, and authentication connections.
9: *
1.64 deraadt 10: * As far as I am concerned, the code I have written for this software
11: * can be used freely for any purpose. Any derived versions of this
12: * software must be clearly marked as such, and if the derived work is
13: * incompatible with the protocol description in the RFC file, it must be
14: * called by a name other than "ssh" or "Secure Shell".
15: *
16: * Copyright (c) 1999 Niels Provos. All rights reserved.
1.202 markus 17: * Copyright (c) 2000, 2001, 2002, 2003 Markus Friedl. All rights reserved.
1.64 deraadt 18: *
19: * Modified to work with SSL by Niels Provos <provos@citi.umich.edu>
20: * in Canada (German citizen).
21: *
22: * Redistribution and use in source and binary forms, with or without
23: * modification, are permitted provided that the following conditions
24: * are met:
25: * 1. Redistributions of source code must retain the above copyright
26: * notice, this list of conditions and the following disclaimer.
27: * 2. Redistributions in binary form must reproduce the above copyright
28: * notice, this list of conditions and the following disclaimer in the
29: * documentation and/or other materials provided with the distribution.
30: *
31: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
32: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
33: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
34: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
35: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
36: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
37: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
38: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
39: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
40: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.32 deraadt 41: */
1.1 deraadt 42:
1.293 deraadt 43: #include <sys/types.h>
1.312 ! djm 44: #include <sys/ioctl.h>
! 45: #include <sys/queue.h>
1.259 stevesk 46: #include <sys/resource.h>
1.280 stevesk 47: #include <sys/socket.h>
1.264 stevesk 48: #include <sys/stat.h>
1.312 ! djm 49: #include <sys/types.h>
! 50: #include <sys/time.h>
1.258 stevesk 51:
1.265 stevesk 52: #include <ctype.h>
1.285 stevesk 53: #include <errno.h>
1.281 stevesk 54: #include <fcntl.h>
1.286 stevesk 55: #include <netdb.h>
1.258 stevesk 56: #include <paths.h>
1.279 stevesk 57: #include <pwd.h>
1.263 stevesk 58: #include <signal.h>
1.287 stevesk 59: #include <stddef.h>
1.291 stevesk 60: #include <stdio.h>
1.290 stevesk 61: #include <stdlib.h>
1.289 stevesk 62: #include <string.h>
1.288 stevesk 63: #include <unistd.h>
1.49 markus 64:
65: #include <openssl/evp.h>
1.72 markus 66: #include <openssl/err.h>
1.1 deraadt 67:
1.293 deraadt 68: #include "xmalloc.h"
1.84 markus 69: #include "ssh.h"
70: #include "ssh1.h"
71: #include "ssh2.h"
72: #include "compat.h"
73: #include "cipher.h"
1.1 deraadt 74: #include "packet.h"
75: #include "buffer.h"
1.123 markus 76: #include "channels.h"
1.49 markus 77: #include "key.h"
1.58 markus 78: #include "authfd.h"
1.49 markus 79: #include "authfile.h"
1.83 markus 80: #include "pathnames.h"
1.214 djm 81: #include "dispatch.h"
1.81 markus 82: #include "clientloop.h"
1.84 markus 83: #include "log.h"
84: #include "readconf.h"
85: #include "sshconnect.h"
86: #include "misc.h"
1.95 markus 87: #include "kex.h"
88: #include "mac.h"
1.213 deraadt 89: #include "sshpty.h"
1.212 djm 90: #include "match.h"
1.214 djm 91: #include "msg.h"
1.225 dtucker 92: #include "uidswap.h"
1.278 stevesk 93: #include "version.h"
1.49 markus 94:
1.127 markus 95: #ifdef SMARTCARD
96: #include "scard.h"
1.137 jakob 97: #endif
1.127 markus 98:
1.49 markus 99: extern char *__progname;
1.1 deraadt 100:
1.31 markus 101: /* Flag indicating whether debug mode is on. This can be set on the command line. */
1.1 deraadt 102: int debug_flag = 0;
103:
1.46 markus 104: /* Flag indicating whether a tty should be allocated */
1.1 deraadt 105: int tty_flag = 0;
1.79 markus 106: int no_tty_flag = 0;
107: int force_tty_flag = 0;
1.1 deraadt 108:
1.45 markus 109: /* don't exec a shell */
110: int no_shell_flag = 0;
111:
1.33 markus 112: /*
113: * Flag indicating that nothing should be read from stdin. This can be set
114: * on the command line.
115: */
1.1 deraadt 116: int stdin_null_flag = 0;
117:
1.33 markus 118: /*
119: * Flag indicating that ssh should fork after authentication. This is useful
1.172 deraadt 120: * so that the passphrase can be entered manually, and then ssh goes to the
1.33 markus 121: * background.
122: */
1.1 deraadt 123: int fork_after_authentication_flag = 0;
124:
1.33 markus 125: /*
126: * General data structure for command line options and options configurable
127: * in configuration files. See readconf.h.
128: */
1.1 deraadt 129: Options options;
130:
1.139 markus 131: /* optional user configfile */
132: char *config = NULL;
133:
1.33 markus 134: /*
135: * Name of the host we are connecting to. This is the name given on the
136: * command line, or the HostName specified for the user-supplied name in a
137: * configuration file.
138: */
1.1 deraadt 139: char *host;
140:
1.22 provos 141: /* socket address the host resolves to */
1.37 markus 142: struct sockaddr_storage hostaddr;
1.1 deraadt 143:
1.112 markus 144: /* Private host keys. */
1.173 markus 145: Sensitive sensitive_data;
1.1 deraadt 146:
1.10 dugsong 147: /* Original real UID. */
148: uid_t original_real_uid;
1.177 markus 149: uid_t original_effective_uid;
1.1 deraadt 150:
1.45 markus 151: /* command to be executed */
152: Buffer command;
153:
1.85 djm 154: /* Should we execute a command or invoke a subsystem? */
155: int subsystem_flag = 0;
156:
1.170 markus 157: /* # of replies received for global requests */
158: static int client_global_request_id = 0;
159:
1.186 djm 160: /* pid of proxycommand child process */
161: pid_t proxy_command_pid = 0;
162:
1.1 deraadt 163: /* Prints a help message to the user. This function never returns. */
164:
1.126 itojun 165: static void
1.93 itojun 166: usage(void)
1.1 deraadt 167: {
1.208 markus 168: fprintf(stderr,
1.297 djm 169: "usage: ssh [-1246AaCfgKkMNnqsTtVvXxY] [-b bind_address] [-c cipher_spec]\n"
1.251 jmc 170: " [-D [bind_address:]port] [-e escape_char] [-F configfile]\n"
1.233 jmc 171: " [-i identity_file] [-L [bind_address:]port:host:hostport]\n"
1.232 djm 172: " [-l login_name] [-m mac_spec] [-O ctl_cmd] [-o option] [-p port]\n"
1.233 jmc 173: " [-R [bind_address:]port:host:hostport] [-S ctl_path]\n"
1.277 stevesk 174: " [-w local_tun[:remote_tun]] [user@]hostname [command]\n"
1.208 markus 175: );
1.257 dtucker 176: exit(255);
1.1 deraadt 177: }
178:
1.126 itojun 179: static int ssh_session(void);
180: static int ssh_session2(void);
181: static void load_public_identity_files(void);
1.312 ! djm 182:
! 183: /* from muxclient.c */
! 184: void muxclient(const char *);
! 185: void muxserver_listen(void);
1.45 markus 186:
1.32 deraadt 187: /*
188: * Main program for the ssh client.
189: */
1.2 provos 190: int
191: main(int ac, char **av)
1.1 deraadt 192: {
1.178 markus 193: int i, opt, exit_status;
1.205 markus 194: char *p, *cp, *line, buf[256];
1.31 markus 195: struct stat st;
1.98 markus 196: struct passwd *pw;
1.303 djm 197: int dummy, timeout_ms;
1.144 stevesk 198: extern int optind, optreset;
199: extern char *optarg;
1.244 djm 200: struct servent *sp;
1.232 djm 201: Forward fwd;
1.250 djm 202:
203: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
204: sanitise_stdfd();
1.31 markus 205:
1.33 markus 206: /*
207: * Save the original real uid. It will be needed later (uid-swapping
208: * may clobber the real uid).
209: */
1.31 markus 210: original_real_uid = getuid();
211: original_effective_uid = geteuid();
212:
1.184 stevesk 213: /*
214: * Use uid-swapping to give up root privileges for the duration of
215: * option processing. We will re-instantiate the rights when we are
216: * ready to create the privileged port, and will permanently drop
217: * them when the port has been created (actually, when the connection
218: * has been made, as we may need to create the port several times).
219: */
220: PRIV_END;
221:
1.31 markus 222: /* If we are installed setuid root be careful to not drop core. */
223: if (original_real_uid != original_effective_uid) {
224: struct rlimit rlim;
225: rlim.rlim_cur = rlim.rlim_max = 0;
226: if (setrlimit(RLIMIT_CORE, &rlim) < 0)
227: fatal("setrlimit failed: %.100s", strerror(errno));
1.1 deraadt 228: }
1.107 markus 229: /* Get user data. */
230: pw = getpwuid(original_real_uid);
231: if (!pw) {
1.191 itojun 232: logit("You don't exist, go away!");
1.257 dtucker 233: exit(255);
1.107 markus 234: }
235: /* Take a copy of the returned structure. */
236: pw = pwcopy(pw);
1.31 markus 237:
1.33 markus 238: /*
239: * Set our umask to something reasonable, as some files are created
240: * with the default umask. This will make them world-readable but
241: * writable only by the owner, which is ok for all files for which we
242: * don't set the modes explicitly.
243: */
1.31 markus 244: umask(022);
245:
246: /* Initialize option structure to indicate that no values have been set. */
247: initialize_options(&options);
248:
249: /* Parse command-line arguments. */
250: host = NULL;
251:
1.266 djm 252: again:
1.128 fgsch 253: while ((opt = getopt(ac, av,
1.297 djm 254: "1246ab:c:e:fgi:kl:m:no:p:qstvxACD:F:I:KL:MNO:PR:S:TVw:XY")) != -1) {
1.31 markus 255: switch (opt) {
1.91 jakob 256: case '1':
257: options.protocol = SSH_PROTO_1;
258: break;
1.47 markus 259: case '2':
260: options.protocol = SSH_PROTO_2;
261: break;
1.37 markus 262: case '4':
1.196 djm 263: options.address_family = AF_INET;
1.37 markus 264: break;
265: case '6':
1.196 djm 266: options.address_family = AF_INET6;
1.37 markus 267: break;
1.31 markus 268: case 'n':
269: stdin_null_flag = 1;
270: break;
271: case 'f':
272: fork_after_authentication_flag = 1;
273: stdin_null_flag = 1;
274: break;
275: case 'x':
276: options.forward_x11 = 0;
277: break;
278: case 'X':
279: options.forward_x11 = 1;
280: break;
1.202 markus 281: case 'Y':
282: options.forward_x11 = 1;
283: options.forward_x11_trusted = 1;
284: break;
1.31 markus 285: case 'g':
286: options.gateway_ports = 1;
287: break;
1.229 djm 288: case 'O':
289: if (strcmp(optarg, "check") == 0)
1.312 ! djm 290: muxclient_command = SSHMUX_COMMAND_ALIVE_CHECK;
1.229 djm 291: else if (strcmp(optarg, "exit") == 0)
1.312 ! djm 292: muxclient_command = SSHMUX_COMMAND_TERMINATE;
1.229 djm 293: else
294: fatal("Invalid multiplex command.");
295: break;
1.183 stevesk 296: case 'P': /* deprecated */
1.31 markus 297: options.use_privileged_port = 0;
298: break;
299: case 'a':
300: options.forward_agent = 0;
1.53 markus 301: break;
302: case 'A':
303: options.forward_agent = 1;
1.31 markus 304: break;
305: case 'k':
1.204 dtucker 306: options.gss_deleg_creds = 0;
1.297 djm 307: break;
308: case 'K':
309: options.gss_authentication = 1;
310: options.gss_deleg_creds = 1;
1.31 markus 311: break;
312: case 'i':
313: if (stat(optarg, &st) < 0) {
1.128 fgsch 314: fprintf(stderr, "Warning: Identity file %s "
1.231 otto 315: "not accessible: %s.\n", optarg,
316: strerror(errno));
1.31 markus 317: break;
318: }
1.128 fgsch 319: if (options.num_identity_files >=
320: SSH_MAX_IDENTITY_FILES)
321: fatal("Too many identity files specified "
322: "(max %d)", SSH_MAX_IDENTITY_FILES);
323: options.identity_files[options.num_identity_files++] =
324: xstrdup(optarg);
1.31 markus 325: break;
1.127 markus 326: case 'I':
327: #ifdef SMARTCARD
1.133 markus 328: options.smartcard_device = xstrdup(optarg);
1.137 jakob 329: #else
1.127 markus 330: fprintf(stderr, "no support for smartcards.\n");
1.137 jakob 331: #endif
1.127 markus 332: break;
1.31 markus 333: case 't':
1.79 markus 334: if (tty_flag)
335: force_tty_flag = 1;
1.31 markus 336: tty_flag = 1;
337: break;
338: case 'v':
1.197 markus 339: if (debug_flag == 0) {
1.66 markus 340: debug_flag = 1;
341: options.log_level = SYSLOG_LEVEL_DEBUG1;
1.197 markus 342: } else {
343: if (options.log_level < SYSLOG_LEVEL_DEBUG3)
344: options.log_level++;
1.66 markus 345: break;
1.197 markus 346: }
1.227 deraadt 347: /* FALLTHROUGH */
1.31 markus 348: case 'V':
1.209 markus 349: fprintf(stderr, "%s, %s\n",
350: SSH_VERSION, SSLeay_version(SSLEAY_VERSION));
1.31 markus 351: if (opt == 'V')
352: exit(0);
353: break;
1.255 reyk 354: case 'w':
1.256 reyk 355: if (options.tun_open == -1)
356: options.tun_open = SSH_TUNMODE_DEFAULT;
1.255 reyk 357: options.tun_local = a2tun(optarg, &options.tun_remote);
1.256 reyk 358: if (options.tun_local == SSH_TUNID_ERR) {
1.255 reyk 359: fprintf(stderr, "Bad tun device '%s'\n", optarg);
1.257 dtucker 360: exit(255);
1.255 reyk 361: }
362: break;
1.31 markus 363: case 'q':
364: options.log_level = SYSLOG_LEVEL_QUIET;
365: break;
366: case 'e':
367: if (optarg[0] == '^' && optarg[2] == 0 &&
1.128 fgsch 368: (u_char) optarg[1] >= 64 &&
369: (u_char) optarg[1] < 128)
1.78 markus 370: options.escape_char = (u_char) optarg[1] & 31;
1.31 markus 371: else if (strlen(optarg) == 1)
1.78 markus 372: options.escape_char = (u_char) optarg[0];
1.31 markus 373: else if (strcmp(optarg, "none") == 0)
1.119 stevesk 374: options.escape_char = SSH_ESCAPECHAR_NONE;
1.31 markus 375: else {
1.128 fgsch 376: fprintf(stderr, "Bad escape character '%s'.\n",
377: optarg);
1.257 dtucker 378: exit(255);
1.31 markus 379: }
380: break;
381: case 'c':
1.49 markus 382: if (ciphers_valid(optarg)) {
383: /* SSH2 only */
384: options.ciphers = xstrdup(optarg);
1.224 markus 385: options.cipher = SSH_CIPHER_INVALID;
1.49 markus 386: } else {
387: /* SSH1 only */
1.74 markus 388: options.cipher = cipher_number(optarg);
389: if (options.cipher == -1) {
1.128 fgsch 390: fprintf(stderr,
391: "Unknown cipher type '%s'\n",
392: optarg);
1.257 dtucker 393: exit(255);
1.49 markus 394: }
1.128 fgsch 395: if (options.cipher == SSH_CIPHER_3DES)
1.74 markus 396: options.ciphers = "3des-cbc";
1.128 fgsch 397: else if (options.cipher == SSH_CIPHER_BLOWFISH)
1.74 markus 398: options.ciphers = "blowfish-cbc";
1.128 fgsch 399: else
1.74 markus 400: options.ciphers = (char *)-1;
1.95 markus 401: }
402: break;
403: case 'm':
404: if (mac_valid(optarg))
405: options.macs = xstrdup(optarg);
406: else {
1.128 fgsch 407: fprintf(stderr, "Unknown mac type '%s'\n",
408: optarg);
1.257 dtucker 409: exit(255);
1.31 markus 410: }
411: break;
1.214 djm 412: case 'M':
1.242 djm 413: if (options.control_master == SSHCTL_MASTER_YES)
414: options.control_master = SSHCTL_MASTER_ASK;
415: else
416: options.control_master = SSHCTL_MASTER_YES;
1.214 djm 417: break;
1.31 markus 418: case 'p':
1.113 stevesk 419: options.port = a2port(optarg);
420: if (options.port == 0) {
1.109 markus 421: fprintf(stderr, "Bad port '%s'\n", optarg);
1.257 dtucker 422: exit(255);
1.109 markus 423: }
1.31 markus 424: break;
425: case 'l':
426: options.user = optarg;
427: break;
1.141 stevesk 428:
429: case 'L':
1.232 djm 430: if (parse_forward(&fwd, optarg))
431: add_local_forward(&options, &fwd);
432: else {
1.128 fgsch 433: fprintf(stderr,
1.232 djm 434: "Bad local forwarding specification '%s'\n",
1.128 fgsch 435: optarg);
1.257 dtucker 436: exit(255);
1.31 markus 437: }
1.232 djm 438: break;
439:
440: case 'R':
441: if (parse_forward(&fwd, optarg)) {
442: add_remote_forward(&options, &fwd);
443: } else {
1.128 fgsch 444: fprintf(stderr,
1.232 djm 445: "Bad remote forwarding specification "
446: "'%s'\n", optarg);
1.257 dtucker 447: exit(255);
1.31 markus 448: }
449: break;
1.108 markus 450:
451: case 'D':
1.232 djm 452: cp = p = xstrdup(optarg);
453: memset(&fwd, '\0', sizeof(fwd));
454: fwd.connect_host = "socks";
455: if ((fwd.listen_host = hpdelim(&cp)) == NULL) {
456: fprintf(stderr, "Bad dynamic forwarding "
457: "specification '%.100s'\n", optarg);
1.257 dtucker 458: exit(255);
1.232 djm 459: }
460: if (cp != NULL) {
461: fwd.listen_port = a2port(cp);
462: fwd.listen_host = cleanhostname(fwd.listen_host);
463: } else {
464: fwd.listen_port = a2port(fwd.listen_host);
1.249 djm 465: fwd.listen_host = NULL;
1.232 djm 466: }
467:
468: if (fwd.listen_port == 0) {
1.128 fgsch 469: fprintf(stderr, "Bad dynamic port '%s'\n",
470: optarg);
1.257 dtucker 471: exit(255);
1.109 markus 472: }
1.232 djm 473: add_local_forward(&options, &fwd);
474: xfree(p);
1.108 markus 475: break;
476:
1.31 markus 477: case 'C':
478: options.compression = 1;
479: break;
1.45 markus 480: case 'N':
481: no_shell_flag = 1;
482: no_tty_flag = 1;
483: break;
484: case 'T':
485: no_tty_flag = 1;
486: break;
1.31 markus 487: case 'o':
488: dummy = 1;
1.205 markus 489: line = xstrdup(optarg);
1.128 fgsch 490: if (process_config_line(&options, host ? host : "",
1.205 markus 491: line, "command-line", 0, &dummy) != 0)
1.257 dtucker 492: exit(255);
1.205 markus 493: xfree(line);
1.31 markus 494: break;
1.85 djm 495: case 's':
496: subsystem_flag = 1;
1.117 markus 497: break;
1.214 djm 498: case 'S':
499: if (options.control_path != NULL)
500: free(options.control_path);
501: options.control_path = xstrdup(optarg);
502: break;
1.117 markus 503: case 'b':
504: options.bind_address = optarg;
1.85 djm 505: break;
1.139 markus 506: case 'F':
507: config = optarg;
508: break;
1.31 markus 509: default:
510: usage();
1.1 deraadt 511: }
1.31 markus 512: }
513:
1.128 fgsch 514: ac -= optind;
515: av += optind;
516:
517: if (ac > 0 && !host && **av != '-') {
1.188 markus 518: if (strrchr(*av, '@')) {
1.128 fgsch 519: p = xstrdup(*av);
1.188 markus 520: cp = strrchr(p, '@');
1.128 fgsch 521: if (cp == NULL || cp == p)
522: usage();
523: options.user = p;
524: *cp = '\0';
525: host = ++cp;
526: } else
527: host = *av;
1.189 millert 528: if (ac > 1) {
529: optind = optreset = 1;
1.128 fgsch 530: goto again;
531: }
1.189 millert 532: ac--, av++;
1.128 fgsch 533: }
534:
1.31 markus 535: /* Check that we got a host name. */
536: if (!host)
537: usage();
538:
1.54 markus 539: SSLeay_add_all_algorithms();
1.72 markus 540: ERR_load_crypto_strings();
1.31 markus 541:
542: /* Initialize the command to execute on remote host. */
543: buffer_init(&command);
1.1 deraadt 544:
1.33 markus 545: /*
546: * Save the command to execute on the remote host in a buffer. There
547: * is no limit on the length of the command, except by the maximum
548: * packet size. Also sets the tty flag if there is no command.
549: */
1.128 fgsch 550: if (!ac) {
1.31 markus 551: /* No command specified - execute shell on a tty. */
552: tty_flag = 1;
1.85 djm 553: if (subsystem_flag) {
1.128 fgsch 554: fprintf(stderr,
555: "You must specify a subsystem to invoke.\n");
1.85 djm 556: usage();
557: }
1.31 markus 558: } else {
1.128 fgsch 559: /* A command has been specified. Store it into the buffer. */
560: for (i = 0; i < ac; i++) {
561: if (i)
1.31 markus 562: buffer_append(&command, " ", 1);
563: buffer_append(&command, av[i], strlen(av[i]));
564: }
565: }
566:
567: /* Cannot fork to background if no command. */
1.63 markus 568: if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag)
1.31 markus 569: fatal("Cannot fork into background without a command to execute.");
570:
571: /* Allocate a tty by default if no command specified. */
572: if (buffer_len(&command) == 0)
573: tty_flag = 1;
574:
1.180 deraadt 575: /* Force no tty */
1.75 markus 576: if (no_tty_flag)
577: tty_flag = 0;
1.31 markus 578: /* Do not allocate a tty if stdin is not a tty. */
1.236 djm 579: if ((!isatty(fileno(stdin)) || stdin_null_flag) && !force_tty_flag) {
1.31 markus 580: if (tty_flag)
1.191 itojun 581: logit("Pseudo-terminal will not be allocated because stdin is not a terminal.");
1.31 markus 582: tty_flag = 0;
583: }
1.45 markus 584:
1.101 markus 585: /*
586: * Initialize "log" output. Since we are the client all output
587: * actually goes to stderr.
588: */
1.111 markus 589: log_init(av[0], options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level,
590: SYSLOG_FACILITY_USER, 1);
1.31 markus 591:
1.139 markus 592: /*
593: * Read per-user configuration file. Ignore the system wide config
594: * file if the user specifies a config file on the command line.
595: */
596: if (config != NULL) {
1.211 djm 597: if (!read_config_file(config, host, &options, 0))
1.142 stevesk 598: fatal("Can't open user config file %.100s: "
599: "%.100s", config, strerror(errno));
1.295 stevesk 600: } else {
1.139 markus 601: snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir,
602: _PATH_SSH_USER_CONFFILE);
1.210 djm 603: (void)read_config_file(buf, host, &options, 1);
1.139 markus 604:
1.145 markus 605: /* Read systemwide configuration file after use config. */
1.223 deraadt 606: (void)read_config_file(_PATH_HOST_CONFIG_FILE, host,
1.210 djm 607: &options, 0);
1.139 markus 608: }
1.31 markus 609:
610: /* Fill configuration defaults. */
611: fill_default_options(&options);
612:
1.196 djm 613: channel_set_af(options.address_family);
614:
1.31 markus 615: /* reinit */
1.101 markus 616: log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 1);
1.31 markus 617:
618: if (options.user == NULL)
619: options.user = xstrdup(pw->pw_name);
620:
621: if (options.hostname != NULL)
622: host = options.hostname;
1.195 markus 623:
624: /* force lowercase for hostkey matching */
625: if (options.host_key_alias != NULL) {
626: for (p = options.host_key_alias; *p; p++)
627: if (isupper(*p))
1.271 deraadt 628: *p = (char)tolower(*p);
1.195 markus 629: }
1.190 markus 630:
1.246 djm 631: /* Get default port if port has not been set. */
632: if (options.port == 0) {
633: sp = getservbyname(SSH_SERVICE_NAME, "tcp");
634: options.port = sp ? ntohs(sp->s_port) : SSH_DEFAULT_PORT;
635: }
636:
1.190 markus 637: if (options.proxy_command != NULL &&
1.304 dtucker 638: strcmp(options.proxy_command, "none") == 0) {
639: xfree(options.proxy_command);
1.190 markus 640: options.proxy_command = NULL;
1.304 dtucker 641: }
1.245 djm 642: if (options.control_path != NULL &&
1.304 dtucker 643: strcmp(options.control_path, "none") == 0) {
644: xfree(options.control_path);
1.245 djm 645: options.control_path = NULL;
1.304 dtucker 646: }
1.31 markus 647:
1.214 djm 648: if (options.control_path != NULL) {
1.275 djm 649: char thishost[NI_MAXHOST];
1.261 djm 650:
1.275 djm 651: if (gethostname(thishost, sizeof(thishost)) == -1)
1.261 djm 652: fatal("gethostname: %s", strerror(errno));
1.241 djm 653: snprintf(buf, sizeof(buf), "%d", options.port);
654: cp = tilde_expand_filename(options.control_path,
655: original_real_uid);
1.304 dtucker 656: xfree(options.control_path);
1.241 djm 657: options.control_path = percent_expand(cp, "p", buf, "h", host,
1.275 djm 658: "r", options.user, "l", thishost, (char *)NULL);
1.241 djm 659: xfree(cp);
1.214 djm 660: }
1.312 ! djm 661: if (muxclient_command != 0 && options.control_path == NULL)
1.240 djm 662: fatal("No ControlPath specified for \"-O\" command");
1.242 djm 663: if (options.control_path != NULL)
1.312 ! djm 664: muxclient(options.control_path);
1.214 djm 665:
1.303 djm 666: timeout_ms = options.connection_timeout * 1000;
667:
1.77 markus 668: /* Open a connection to the remote host. */
1.203 djm 669: if (ssh_connect(host, &hostaddr, options.port,
1.303 djm 670: options.address_family, options.connection_attempts, &timeout_ms,
671: options.tcp_keep_alive,
1.177 markus 672: original_effective_uid == 0 && options.use_privileged_port,
1.179 markus 673: options.proxy_command) != 0)
1.257 dtucker 674: exit(255);
1.31 markus 675:
1.303 djm 676: if (timeout_ms > 0)
677: debug3("timeout: %d ms remain after connect", timeout_ms);
678:
1.33 markus 679: /*
680: * If we successfully made the connection, load the host private key
681: * in case we will need it later for combined rsa-rhosts
682: * authentication. This must be done before releasing extra
683: * privileges, because the file is only readable by root.
1.174 markus 684: * If we cannot access the private keys, load the public keys
685: * instead and try to execute the ssh-keysign helper instead.
1.33 markus 686: */
1.112 markus 687: sensitive_data.nkeys = 0;
688: sensitive_data.keys = NULL;
1.173 markus 689: sensitive_data.external_keysign = 0;
1.178 markus 690: if (options.rhosts_rsa_authentication ||
691: options.hostbased_authentication) {
1.112 markus 692: sensitive_data.nkeys = 3;
1.274 deraadt 693: sensitive_data.keys = xcalloc(sensitive_data.nkeys,
1.180 deraadt 694: sizeof(Key));
1.177 markus 695:
696: PRIV_START;
1.112 markus 697: sensitive_data.keys[0] = key_load_private_type(KEY_RSA1,
1.276 dtucker 698: _PATH_HOST_KEY_FILE, "", NULL, NULL);
1.112 markus 699: sensitive_data.keys[1] = key_load_private_type(KEY_DSA,
1.276 dtucker 700: _PATH_HOST_DSA_KEY_FILE, "", NULL, NULL);
1.112 markus 701: sensitive_data.keys[2] = key_load_private_type(KEY_RSA,
1.276 dtucker 702: _PATH_HOST_RSA_KEY_FILE, "", NULL, NULL);
1.177 markus 703: PRIV_END;
1.173 markus 704:
1.181 markus 705: if (options.hostbased_authentication == 1 &&
706: sensitive_data.keys[0] == NULL &&
1.173 markus 707: sensitive_data.keys[1] == NULL &&
708: sensitive_data.keys[2] == NULL) {
709: sensitive_data.keys[1] = key_load_public(
710: _PATH_HOST_DSA_KEY_FILE, NULL);
711: sensitive_data.keys[2] = key_load_public(
712: _PATH_HOST_RSA_KEY_FILE, NULL);
713: sensitive_data.external_keysign = 1;
714: }
1.31 markus 715: }
1.33 markus 716: /*
717: * Get rid of any extra privileges that we may have. We will no
718: * longer need them. Also, extra privileges could make it very hard
719: * to read identity files and other non-world-readable files from the
720: * user's home directory if it happens to be on a NFS volume where
721: * root is mapped to nobody.
722: */
1.225 dtucker 723: if (original_effective_uid == 0) {
724: PRIV_START;
725: permanently_set_uid(pw);
726: }
1.31 markus 727:
1.33 markus 728: /*
729: * Now that we are back to our own permissions, create ~/.ssh
1.254 djm 730: * directory if it doesn't already exist.
1.33 markus 731: */
1.138 jakob 732: snprintf(buf, sizeof buf, "%.100s%s%.100s", pw->pw_dir, strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR);
1.31 markus 733: if (stat(buf, &st) < 0)
1.57 djm 734: if (mkdir(buf, 0700) < 0)
1.31 markus 735: error("Could not create directory '%.200s'.", buf);
736:
1.104 markus 737: /* load options.identity_files */
738: load_public_identity_files();
739:
740: /* Expand ~ in known host file names. */
741: /* XXX mem-leaks: */
1.72 markus 742: options.system_hostfile =
743: tilde_expand_filename(options.system_hostfile, original_real_uid);
744: options.user_hostfile =
745: tilde_expand_filename(options.user_hostfile, original_real_uid);
746: options.system_hostfile2 =
747: tilde_expand_filename(options.system_hostfile2, original_real_uid);
748: options.user_hostfile2 =
749: tilde_expand_filename(options.user_hostfile2, original_real_uid);
1.149 markus 750:
751: signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
1.31 markus 752:
753: /* Log into the remote system. This never returns if the login fails. */
1.303 djm 754: ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr,
755: pw, timeout_ms);
1.31 markus 756:
1.112 markus 757: /* We no longer need the private host keys. Clear them now. */
758: if (sensitive_data.nkeys != 0) {
759: for (i = 0; i < sensitive_data.nkeys; i++) {
760: if (sensitive_data.keys[i] != NULL) {
761: /* Destroys contents safely */
762: debug3("clear hostkey %d", i);
763: key_free(sensitive_data.keys[i]);
764: sensitive_data.keys[i] = NULL;
765: }
766: }
767: xfree(sensitive_data.keys);
1.134 markus 768: }
769: for (i = 0; i < options.num_identity_files; i++) {
770: if (options.identity_files[i]) {
771: xfree(options.identity_files[i]);
772: options.identity_files[i] = NULL;
773: }
774: if (options.identity_keys[i]) {
775: key_free(options.identity_keys[i]);
776: options.identity_keys[i] = NULL;
777: }
1.112 markus 778: }
1.31 markus 779:
1.45 markus 780: exit_status = compat20 ? ssh_session2() : ssh_session();
781: packet_close();
1.186 djm 782:
1.312 ! djm 783: if (options.control_path != NULL && muxserver_sock != -1)
1.214 djm 784: unlink(options.control_path);
785:
1.186 djm 786: /*
1.203 djm 787: * Send SIGHUP to proxy command if used. We don't wait() in
1.186 djm 788: * case it hangs and instead rely on init to reap the child
789: */
790: if (proxy_command_pid > 1)
791: kill(proxy_command_pid, SIGHUP);
792:
1.45 markus 793: return exit_status;
794: }
795:
1.126 itojun 796: static void
1.70 markus 797: ssh_init_forwarding(void)
798: {
1.86 markus 799: int success = 0;
1.70 markus 800: int i;
1.86 markus 801:
1.70 markus 802: /* Initiate local TCP/IP port forwardings. */
803: for (i = 0; i < options.num_local_forwards; i++) {
1.232 djm 804: debug("Local connections to %.200s:%d forwarded to remote "
805: "address %.200s:%d",
1.234 deraadt 806: (options.local_forwards[i].listen_host == NULL) ?
807: (options.gateway_ports ? "*" : "LOCALHOST") :
1.232 djm 808: options.local_forwards[i].listen_host,
809: options.local_forwards[i].listen_port,
810: options.local_forwards[i].connect_host,
811: options.local_forwards[i].connect_port);
1.158 markus 812: success += channel_setup_local_fwd_listener(
1.232 djm 813: options.local_forwards[i].listen_host,
814: options.local_forwards[i].listen_port,
815: options.local_forwards[i].connect_host,
816: options.local_forwards[i].connect_port,
1.70 markus 817: options.gateway_ports);
818: }
1.283 markus 819: if (i > 0 && success != i && options.exit_on_forward_failure)
820: fatal("Could not request local forwarding.");
1.86 markus 821: if (i > 0 && success == 0)
822: error("Could not request local forwarding.");
1.70 markus 823:
824: /* Initiate remote TCP/IP port forwardings. */
825: for (i = 0; i < options.num_remote_forwards; i++) {
1.232 djm 826: debug("Remote connections from %.200s:%d forwarded to "
827: "local address %.200s:%d",
1.248 djm 828: (options.remote_forwards[i].listen_host == NULL) ?
1.253 djm 829: "LOCALHOST" : options.remote_forwards[i].listen_host,
1.232 djm 830: options.remote_forwards[i].listen_port,
831: options.remote_forwards[i].connect_host,
832: options.remote_forwards[i].connect_port);
1.283 markus 833: if (channel_request_remote_forwarding(
1.232 djm 834: options.remote_forwards[i].listen_host,
835: options.remote_forwards[i].listen_port,
836: options.remote_forwards[i].connect_host,
1.283 markus 837: options.remote_forwards[i].connect_port) < 0) {
838: if (options.exit_on_forward_failure)
839: fatal("Could not request remote forwarding.");
840: else
841: logit("Warning: Could not request remote "
842: "forwarding.");
843: }
1.70 markus 844: }
1.301 djm 845:
846: /* Initiate tunnel forwarding. */
847: if (options.tun_open != SSH_TUNMODE_NO) {
848: if (client_request_tun_fwd(options.tun_open,
849: options.tun_local, options.tun_remote) == -1) {
850: if (options.exit_on_forward_failure)
851: fatal("Could not request tunnel forwarding.");
852: else
853: error("Could not request tunnel forwarding.");
854: }
855: }
1.70 markus 856: }
857:
1.126 itojun 858: static void
1.70 markus 859: check_agent_present(void)
860: {
861: if (options.forward_agent) {
1.254 djm 862: /* Clear agent forwarding if we don't have an agent. */
1.185 stevesk 863: if (!ssh_agent_present())
1.70 markus 864: options.forward_agent = 0;
865: }
866: }
867:
1.126 itojun 868: static int
1.45 markus 869: ssh_session(void)
870: {
871: int type;
872: int interactive = 0;
873: int have_tty = 0;
874: struct winsize ws;
875: char *cp;
1.243 djm 876: const char *display;
1.45 markus 877:
1.31 markus 878: /* Enable compression if requested. */
879: if (options.compression) {
880: debug("Requesting compression at level %d.", options.compression_level);
881:
882: if (options.compression_level < 1 || options.compression_level > 9)
883: fatal("Compression level must be from 1 (fast) to 9 (slow, best).");
884:
885: /* Send the request. */
886: packet_start(SSH_CMSG_REQUEST_COMPRESSION);
887: packet_put_int(options.compression_level);
888: packet_send();
889: packet_write_wait();
1.156 markus 890: type = packet_read();
1.31 markus 891: if (type == SSH_SMSG_SUCCESS)
892: packet_start_compression(options.compression_level);
893: else if (type == SSH_SMSG_FAILURE)
1.191 itojun 894: logit("Warning: Remote host refused compression.");
1.31 markus 895: else
896: packet_disconnect("Protocol error waiting for compression response.");
897: }
898: /* Allocate a pseudo tty if appropriate. */
899: if (tty_flag) {
900: debug("Requesting pty.");
901:
902: /* Start the packet. */
903: packet_start(SSH_CMSG_REQUEST_PTY);
904:
905: /* Store TERM in the packet. There is no limit on the
906: length of the string. */
907: cp = getenv("TERM");
908: if (!cp)
909: cp = "";
1.124 markus 910: packet_put_cstring(cp);
1.31 markus 911:
912: /* Store window size in the packet. */
913: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
914: memset(&ws, 0, sizeof(ws));
1.269 deraadt 915: packet_put_int((u_int)ws.ws_row);
916: packet_put_int((u_int)ws.ws_col);
917: packet_put_int((u_int)ws.ws_xpixel);
918: packet_put_int((u_int)ws.ws_ypixel);
1.31 markus 919:
920: /* Store tty modes in the packet. */
1.115 stevesk 921: tty_make_modes(fileno(stdin), NULL);
1.31 markus 922:
923: /* Send the packet, and wait for it to leave. */
924: packet_send();
925: packet_write_wait();
926:
927: /* Read response from the server. */
1.156 markus 928: type = packet_read();
1.43 markus 929: if (type == SSH_SMSG_SUCCESS) {
1.31 markus 930: interactive = 1;
1.45 markus 931: have_tty = 1;
1.43 markus 932: } else if (type == SSH_SMSG_FAILURE)
1.191 itojun 933: logit("Warning: Remote host failed or refused to allocate a pseudo tty.");
1.31 markus 934: else
935: packet_disconnect("Protocol error waiting for pty request response.");
936: }
937: /* Request X11 forwarding if enabled and DISPLAY is set. */
1.243 djm 938: display = getenv("DISPLAY");
939: if (options.forward_x11 && display != NULL) {
1.150 stevesk 940: char *proto, *data;
1.50 markus 941: /* Get reasonable local authentication information. */
1.243 djm 942: client_x11_get_proto(display, options.xauth_location,
943: options.forward_x11_trusted, &proto, &data);
1.50 markus 944: /* Request forwarding with authentication spoofing. */
1.31 markus 945: debug("Requesting X11 forwarding with authentication spoofing.");
1.243 djm 946: x11_request_forwarding_with_spoofing(0, display, proto, data);
1.31 markus 947:
948: /* Read response from the server. */
1.156 markus 949: type = packet_read();
1.31 markus 950: if (type == SSH_SMSG_SUCCESS) {
951: interactive = 1;
1.50 markus 952: } else if (type == SSH_SMSG_FAILURE) {
1.191 itojun 953: logit("Warning: Remote host denied X11 forwarding.");
1.50 markus 954: } else {
1.31 markus 955: packet_disconnect("Protocol error waiting for X11 forwarding");
1.50 markus 956: }
1.31 markus 957: }
958: /* Tell the packet module whether this is an interactive session. */
1.80 markus 959: packet_set_interactive(interactive);
1.31 markus 960:
961: /* Request authentication agent forwarding if appropriate. */
1.70 markus 962: check_agent_present();
963:
1.31 markus 964: if (options.forward_agent) {
965: debug("Requesting authentication agent forwarding.");
966: auth_request_forwarding();
967:
968: /* Read response from the server. */
1.156 markus 969: type = packet_read();
1.155 markus 970: packet_check_eom();
1.31 markus 971: if (type != SSH_SMSG_SUCCESS)
1.191 itojun 972: logit("Warning: Remote host denied authentication agent forwarding.");
1.31 markus 973: }
974:
1.70 markus 975: /* Initiate port forwardings. */
976: ssh_init_forwarding();
1.305 dtucker 977:
978: /* Execute a local command */
979: if (options.local_command != NULL &&
980: options.permit_local_command)
981: ssh_local_cmd(options.local_command);
1.34 markus 982:
983: /* If requested, let ssh continue in the background. */
1.48 markus 984: if (fork_after_authentication_flag)
1.34 markus 985: if (daemon(1, 1) < 0)
986: fatal("daemon() failed: %.200s", strerror(errno));
1.31 markus 987:
1.33 markus 988: /*
989: * If a command was specified on the command line, execute the
990: * command now. Otherwise request the server to start a shell.
991: */
1.31 markus 992: if (buffer_len(&command) > 0) {
993: int len = buffer_len(&command);
994: if (len > 900)
995: len = 900;
1.152 stevesk 996: debug("Sending command: %.*s", len, (u_char *)buffer_ptr(&command));
1.31 markus 997: packet_start(SSH_CMSG_EXEC_CMD);
998: packet_put_string(buffer_ptr(&command), buffer_len(&command));
999: packet_send();
1000: packet_write_wait();
1001: } else {
1002: debug("Requesting shell.");
1003: packet_start(SSH_CMSG_EXEC_SHELL);
1004: packet_send();
1005: packet_write_wait();
1006: }
1007:
1008: /* Enter the interactive session. */
1.119 stevesk 1009: return client_loop(have_tty, tty_flag ?
1010: options.escape_char : SSH_ESCAPECHAR_NONE, 0);
1.45 markus 1011: }
1012:
1.170 markus 1013: void
1.206 markus 1014: client_global_request_reply_fwd(int type, u_int32_t seq, void *ctxt)
1.170 markus 1015: {
1016: int i;
1017:
1018: i = client_global_request_id++;
1.206 markus 1019: if (i >= options.num_remote_forwards)
1.170 markus 1020: return;
1021: debug("remote forward %s for: listen %d, connect %s:%d",
1022: type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
1.232 djm 1023: options.remote_forwards[i].listen_port,
1024: options.remote_forwards[i].connect_host,
1025: options.remote_forwards[i].connect_port);
1.283 markus 1026: if (type == SSH2_MSG_REQUEST_FAILURE) {
1027: if (options.exit_on_forward_failure)
1028: fatal("Error: remote port forwarding failed for "
1029: "listen port %d",
1030: options.remote_forwards[i].listen_port);
1031: else
1032: logit("Warning: remote port forwarding failed for "
1033: "listen port %d",
1034: options.remote_forwards[i].listen_port);
1035: }
1.89 markus 1036: }
1037:
1.214 djm 1038: /* request pty/x11/agent/tcpfwd/shell for channel */
1039: static void
1040: ssh_session2_setup(int id, void *arg)
1041: {
1.215 djm 1042: extern char **environ;
1.243 djm 1043: const char *display;
1044: int interactive = tty_flag;
1.215 djm 1045:
1.248 djm 1046: display = getenv("DISPLAY");
1.243 djm 1047: if (options.forward_x11 && display != NULL) {
1.150 stevesk 1048: char *proto, *data;
1.50 markus 1049: /* Get reasonable local authentication information. */
1.243 djm 1050: client_x11_get_proto(display, options.xauth_location,
1051: options.forward_x11_trusted, &proto, &data);
1.50 markus 1052: /* Request forwarding with authentication spoofing. */
1053: debug("Requesting X11 forwarding with authentication spoofing.");
1.243 djm 1054: x11_request_forwarding_with_spoofing(id, display, proto, data);
1.80 markus 1055: interactive = 1;
1.50 markus 1056: /* XXX wait for reply */
1057: }
1058:
1.70 markus 1059: check_agent_present();
1060: if (options.forward_agent) {
1061: debug("Requesting authentication agent forwarding.");
1062: channel_request_start(id, "auth-agent-req@openssh.com", 0);
1063: packet_send();
1.212 djm 1064: }
1065:
1.214 djm 1066: client_session2_setup(id, tty_flag, subsystem_flag, getenv("TERM"),
1.311 djm 1067: NULL, fileno(stdin), &command, environ);
1.90 markus 1068:
1.80 markus 1069: packet_set_interactive(interactive);
1.45 markus 1070: }
1071:
1.143 markus 1072: /* open new channel for a session */
1.126 itojun 1073: static int
1.143 markus 1074: ssh_session2_open(void)
1.45 markus 1075: {
1.118 markus 1076: Channel *c;
1077: int window, packetmax, in, out, err;
1.60 markus 1078:
1.62 markus 1079: if (stdin_null_flag) {
1.93 itojun 1080: in = open(_PATH_DEVNULL, O_RDONLY);
1.62 markus 1081: } else {
1082: in = dup(STDIN_FILENO);
1083: }
1.60 markus 1084: out = dup(STDOUT_FILENO);
1085: err = dup(STDERR_FILENO);
1.45 markus 1086:
1087: if (in < 0 || out < 0 || err < 0)
1.62 markus 1088: fatal("dup() in/out/err failed");
1.45 markus 1089:
1.69 markus 1090: /* enable nonblocking unless tty */
1091: if (!isatty(in))
1092: set_nonblock(in);
1093: if (!isatty(out))
1094: set_nonblock(out);
1095: if (!isatty(err))
1096: set_nonblock(err);
1097:
1.65 markus 1098: window = CHAN_SES_WINDOW_DEFAULT;
1099: packetmax = CHAN_SES_PACKET_DEFAULT;
1.164 markus 1100: if (tty_flag) {
1101: window >>= 1;
1102: packetmax >>= 1;
1.45 markus 1103: }
1.118 markus 1104: c = channel_new(
1.45 markus 1105: "session", SSH_CHANNEL_OPENING, in, out, err,
1.65 markus 1106: window, packetmax, CHAN_EXTENDED_WRITE,
1.192 markus 1107: "client-session", /*nonblock*/0);
1.45 markus 1108:
1.143 markus 1109: debug3("ssh_session2_open: channel_new: %d", c->self);
1.106 markus 1110:
1.122 markus 1111: channel_send_open(c->self);
1.143 markus 1112: if (!no_shell_flag)
1.310 djm 1113: channel_register_open_confirm(c->self,
1114: ssh_session2_setup, NULL);
1.106 markus 1115:
1.118 markus 1116: return c->self;
1.106 markus 1117: }
1118:
1.126 itojun 1119: static int
1.106 markus 1120: ssh_session2(void)
1121: {
1.143 markus 1122: int id = -1;
1.106 markus 1123:
1124: /* XXX should be pre-session */
1125: ssh_init_forwarding();
1126:
1.143 markus 1127: if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN))
1128: id = ssh_session2_open();
1.255 reyk 1129:
1130: /* Execute a local command */
1131: if (options.local_command != NULL &&
1132: options.permit_local_command)
1133: ssh_local_cmd(options.local_command);
1.301 djm 1134:
1135: /* Start listening for multiplex clients */
1.312 ! djm 1136: muxserver_listen();
1.106 markus 1137:
1138: /* If requested, let ssh continue in the background. */
1139: if (fork_after_authentication_flag)
1140: if (daemon(1, 1) < 0)
1141: fatal("daemon() failed: %.200s", strerror(errno));
1.31 markus 1142:
1.119 stevesk 1143: return client_loop(tty_flag, tty_flag ?
1144: options.escape_char : SSH_ESCAPECHAR_NONE, id);
1.72 markus 1145: }
1146:
1.126 itojun 1147: static void
1.104 markus 1148: load_public_identity_files(void)
1149: {
1.275 djm 1150: char *filename, *cp, thishost[NI_MAXHOST];
1.306 deraadt 1151: char *pwdir = NULL, *pwname = NULL;
1.167 markus 1152: int i = 0;
1.104 markus 1153: Key *public;
1.275 djm 1154: struct passwd *pw;
1.167 markus 1155: #ifdef SMARTCARD
1156: Key **keys;
1.104 markus 1157:
1.133 markus 1158: if (options.smartcard_device != NULL &&
1.167 markus 1159: options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
1.292 stevesk 1160: (keys = sc_get_keys(options.smartcard_device, NULL)) != NULL) {
1.167 markus 1161: int count = 0;
1162: for (i = 0; keys[i] != NULL; i++) {
1163: count++;
1164: memmove(&options.identity_files[1], &options.identity_files[0],
1165: sizeof(char *) * (SSH_MAX_IDENTITY_FILES - 1));
1166: memmove(&options.identity_keys[1], &options.identity_keys[0],
1167: sizeof(Key *) * (SSH_MAX_IDENTITY_FILES - 1));
1168: options.num_identity_files++;
1169: options.identity_keys[0] = keys[i];
1.194 markus 1170: options.identity_files[0] = sc_get_key_label(keys[i]);
1.167 markus 1171: }
1.168 markus 1172: if (options.num_identity_files > SSH_MAX_IDENTITY_FILES)
1173: options.num_identity_files = SSH_MAX_IDENTITY_FILES;
1.167 markus 1174: i = count;
1175: xfree(keys);
1.127 markus 1176: }
1.136 jakob 1177: #endif /* SMARTCARD */
1.275 djm 1178: if ((pw = getpwuid(original_real_uid)) == NULL)
1179: fatal("load_public_identity_files: getpwuid failed");
1.307 dtucker 1180: pwname = xstrdup(pw->pw_name);
1181: pwdir = xstrdup(pw->pw_dir);
1.275 djm 1182: if (gethostname(thishost, sizeof(thishost)) == -1)
1183: fatal("load_public_identity_files: gethostname: %s",
1184: strerror(errno));
1.131 millert 1185: for (; i < options.num_identity_files; i++) {
1.275 djm 1186: cp = tilde_expand_filename(options.identity_files[i],
1.131 millert 1187: original_real_uid);
1.306 deraadt 1188: filename = percent_expand(cp, "d", pwdir,
1189: "u", pwname, "l", thishost, "h", host,
1.275 djm 1190: "r", options.user, (char *)NULL);
1191: xfree(cp);
1.131 millert 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: }
1.306 deraadt 1199: bzero(pwname, strlen(pwname));
1.307 dtucker 1200: xfree(pwname);
1.306 deraadt 1201: bzero(pwdir, strlen(pwdir));
1.307 dtucker 1202: xfree(pwdir);
1.214 djm 1203: }
1204:
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