Annotation of src/usr.bin/ssh/ssh.c, Revision 1.198
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.
1.169 markus 16: * Copyright (c) 2000, 2001, 2002 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"
1.198 ! markus 43: RCSID("$OpenBSD: ssh.c,v 1.197 2003/07/16 10:34:53 markus 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"
1.123 markus 56: #include "channels.h"
1.49 markus 57: #include "key.h"
1.58 markus 58: #include "authfd.h"
1.49 markus 59: #include "authfile.h"
1.83 markus 60: #include "pathnames.h"
1.81 markus 61: #include "clientloop.h"
1.84 markus 62: #include "log.h"
63: #include "readconf.h"
64: #include "sshconnect.h"
65: #include "tildexpand.h"
1.89 markus 66: #include "dispatch.h"
1.84 markus 67: #include "misc.h"
1.95 markus 68: #include "kex.h"
69: #include "mac.h"
1.115 stevesk 70: #include "sshtty.h"
1.49 markus 71:
1.127 markus 72: #ifdef SMARTCARD
73: #include "scard.h"
1.137 jakob 74: #endif
1.127 markus 75:
1.49 markus 76: extern char *__progname;
1.1 deraadt 77:
1.31 markus 78: /* Flag indicating whether debug mode is on. This can be set on the command line. */
1.1 deraadt 79: int debug_flag = 0;
80:
1.46 markus 81: /* Flag indicating whether a tty should be allocated */
1.1 deraadt 82: int tty_flag = 0;
1.79 markus 83: int no_tty_flag = 0;
84: int force_tty_flag = 0;
1.1 deraadt 85:
1.45 markus 86: /* don't exec a shell */
87: int no_shell_flag = 0;
88:
1.33 markus 89: /*
90: * Flag indicating that nothing should be read from stdin. This can be set
91: * on the command line.
92: */
1.1 deraadt 93: int stdin_null_flag = 0;
94:
1.33 markus 95: /*
96: * Flag indicating that ssh should fork after authentication. This is useful
1.172 deraadt 97: * so that the passphrase can be entered manually, and then ssh goes to the
1.33 markus 98: * background.
99: */
1.1 deraadt 100: int fork_after_authentication_flag = 0;
101:
1.33 markus 102: /*
103: * General data structure for command line options and options configurable
104: * in configuration files. See readconf.h.
105: */
1.1 deraadt 106: Options options;
107:
1.139 markus 108: /* optional user configfile */
109: char *config = NULL;
110:
1.33 markus 111: /*
112: * Name of the host we are connecting to. This is the name given on the
113: * command line, or the HostName specified for the user-supplied name in a
114: * configuration file.
115: */
1.1 deraadt 116: char *host;
117:
1.22 provos 118: /* socket address the host resolves to */
1.37 markus 119: struct sockaddr_storage hostaddr;
1.1 deraadt 120:
1.112 markus 121: /* Private host keys. */
1.173 markus 122: Sensitive sensitive_data;
1.1 deraadt 123:
1.10 dugsong 124: /* Original real UID. */
125: uid_t original_real_uid;
1.177 markus 126: uid_t original_effective_uid;
1.1 deraadt 127:
1.45 markus 128: /* command to be executed */
129: Buffer command;
130:
1.85 djm 131: /* Should we execute a command or invoke a subsystem? */
132: int subsystem_flag = 0;
133:
1.170 markus 134: /* # of replies received for global requests */
135: static int client_global_request_id = 0;
136:
1.186 djm 137: /* pid of proxycommand child process */
138: pid_t proxy_command_pid = 0;
139:
1.1 deraadt 140: /* Prints a help message to the user. This function never returns. */
141:
1.126 itojun 142: static void
1.93 itojun 143: usage(void)
1.1 deraadt 144: {
1.76 markus 145: fprintf(stderr, "Usage: %s [options] host [command]\n", __progname);
1.31 markus 146: fprintf(stderr, "Options:\n");
147: fprintf(stderr, " -l user Log in using this user name.\n");
1.93 itojun 148: fprintf(stderr, " -n Redirect input from " _PATH_DEVNULL ".\n");
1.139 markus 149: fprintf(stderr, " -F config Config file (default: ~/%s).\n",
150: _PATH_SSH_USER_CONFFILE);
1.53 markus 151: fprintf(stderr, " -A Enable authentication agent forwarding.\n");
1.120 markus 152: fprintf(stderr, " -a Disable authentication agent forwarding (default).\n");
1.198 ! markus 153: fprintf(stderr, " -k Disable Kerberos ticket forwarding.\n");
1.88 stevesk 154: fprintf(stderr, " -X Enable X11 connection forwarding.\n");
1.120 markus 155: fprintf(stderr, " -x Disable X11 connection forwarding (default).\n");
1.99 deraadt 156: fprintf(stderr, " -i file Identity for public key authentication "
157: "(default: ~/.ssh/identity)\n");
1.135 jakob 158: #ifdef SMARTCARD
159: fprintf(stderr, " -I reader Set smartcard reader.\n");
1.137 jakob 160: #endif
1.31 markus 161: fprintf(stderr, " -t Tty; allocate a tty even if command is given.\n");
1.45 markus 162: fprintf(stderr, " -T Do not allocate a tty.\n");
1.31 markus 163: fprintf(stderr, " -v Verbose; display verbose debugging messages.\n");
1.66 markus 164: fprintf(stderr, " Multiple -v increases verbosity.\n");
1.31 markus 165: fprintf(stderr, " -V Display version number only.\n");
166: fprintf(stderr, " -q Quiet; don't display any warning messages.\n");
167: fprintf(stderr, " -f Fork into background after authentication.\n");
168: fprintf(stderr, " -e char Set escape character; ``none'' = disable (default: ~).\n");
169:
1.120 markus 170: fprintf(stderr, " -c cipher Select encryption algorithm\n");
1.102 stevesk 171: fprintf(stderr, " -m macs Specify MAC algorithms for protocol version 2.\n");
1.31 markus 172: fprintf(stderr, " -p port Connect to this port. Server must be on the same port.\n");
173: fprintf(stderr, " -L listen-port:host:port Forward local port to remote address\n");
174: fprintf(stderr, " -R listen-port:host:port Forward remote port to local address\n");
1.76 markus 175: fprintf(stderr, " These cause %s to listen for connections on a port, and\n", __progname);
1.31 markus 176: fprintf(stderr, " forward them to the other side by connecting to host:port.\n");
1.140 stevesk 177: fprintf(stderr, " -D port Enable dynamic application-level port forwarding.\n");
1.31 markus 178: fprintf(stderr, " -C Enable compression.\n");
1.45 markus 179: fprintf(stderr, " -N Do not execute a shell or command.\n");
1.31 markus 180: fprintf(stderr, " -g Allow remote hosts to connect to forwarded ports.\n");
1.92 jakob 181: fprintf(stderr, " -1 Force protocol version 1.\n");
182: fprintf(stderr, " -2 Force protocol version 2.\n");
1.37 markus 183: fprintf(stderr, " -4 Use IPv4 only.\n");
184: fprintf(stderr, " -6 Use IPv6 only.\n");
1.31 markus 185: fprintf(stderr, " -o 'option' Process the option as if it was read from a configuration file.\n");
1.85 djm 186: fprintf(stderr, " -s Invoke command (mandatory) as SSH2 subsystem.\n");
1.120 markus 187: fprintf(stderr, " -b addr Local IP address.\n");
1.31 markus 188: exit(1);
1.1 deraadt 189: }
190:
1.126 itojun 191: static int ssh_session(void);
192: static int ssh_session2(void);
193: static void load_public_identity_files(void);
1.45 markus 194:
1.32 deraadt 195: /*
196: * Main program for the ssh client.
197: */
1.2 provos 198: int
199: main(int ac, char **av)
1.1 deraadt 200: {
1.178 markus 201: int i, opt, exit_status;
1.35 markus 202: u_short fwd_port, fwd_host_port;
1.141 stevesk 203: char sfwd_port[6], sfwd_host_port[6];
1.128 fgsch 204: char *p, *cp, buf[256];
1.31 markus 205: struct stat st;
1.98 markus 206: struct passwd *pw;
1.45 markus 207: int dummy;
1.144 stevesk 208: extern int optind, optreset;
209: extern char *optarg;
1.31 markus 210:
1.33 markus 211: /*
212: * Save the original real uid. It will be needed later (uid-swapping
213: * may clobber the real uid).
214: */
1.31 markus 215: original_real_uid = getuid();
216: original_effective_uid = geteuid();
217:
1.184 stevesk 218: /*
219: * Use uid-swapping to give up root privileges for the duration of
220: * option processing. We will re-instantiate the rights when we are
221: * ready to create the privileged port, and will permanently drop
222: * them when the port has been created (actually, when the connection
223: * has been made, as we may need to create the port several times).
224: */
225: PRIV_END;
226:
1.31 markus 227: /* If we are installed setuid root be careful to not drop core. */
228: if (original_real_uid != original_effective_uid) {
229: struct rlimit rlim;
230: rlim.rlim_cur = rlim.rlim_max = 0;
231: if (setrlimit(RLIMIT_CORE, &rlim) < 0)
232: fatal("setrlimit failed: %.100s", strerror(errno));
1.1 deraadt 233: }
1.107 markus 234: /* Get user data. */
235: pw = getpwuid(original_real_uid);
236: if (!pw) {
1.191 itojun 237: logit("You don't exist, go away!");
1.107 markus 238: exit(1);
239: }
240: /* Take a copy of the returned structure. */
241: pw = pwcopy(pw);
1.31 markus 242:
1.33 markus 243: /*
244: * Set our umask to something reasonable, as some files are created
245: * with the default umask. This will make them world-readable but
246: * writable only by the owner, which is ok for all files for which we
247: * don't set the modes explicitly.
248: */
1.31 markus 249: umask(022);
250:
251: /* Initialize option structure to indicate that no values have been set. */
252: initialize_options(&options);
253:
254: /* Parse command-line arguments. */
255: host = NULL;
256:
1.128 fgsch 257: again:
258: while ((opt = getopt(ac, av,
1.139 markus 259: "1246ab:c:e:fgi:kl:m:no:p:qstvxACD:F:I:L:NPR:TVX")) != -1) {
1.31 markus 260: switch (opt) {
1.91 jakob 261: case '1':
262: options.protocol = SSH_PROTO_1;
263: break;
1.47 markus 264: case '2':
265: options.protocol = SSH_PROTO_2;
266: break;
1.37 markus 267: case '4':
1.196 djm 268: options.address_family = AF_INET;
1.37 markus 269: break;
270: case '6':
1.196 djm 271: options.address_family = AF_INET6;
1.37 markus 272: break;
1.31 markus 273: case 'n':
274: stdin_null_flag = 1;
275: break;
276: case 'f':
277: fork_after_authentication_flag = 1;
278: stdin_null_flag = 1;
279: break;
280: case 'x':
281: options.forward_x11 = 0;
282: break;
283: case 'X':
284: options.forward_x11 = 1;
285: break;
286: case 'g':
287: options.gateway_ports = 1;
288: break;
1.183 stevesk 289: case 'P': /* deprecated */
1.31 markus 290: options.use_privileged_port = 0;
291: break;
292: case 'a':
293: options.forward_agent = 0;
1.53 markus 294: break;
295: case 'A':
296: options.forward_agent = 1;
1.31 markus 297: break;
298: case 'k':
299: options.kerberos_tgt_passing = 0;
300: break;
301: case 'i':
302: if (stat(optarg, &st) < 0) {
1.128 fgsch 303: fprintf(stderr, "Warning: Identity file %s "
304: "does not exist.\n", optarg);
1.31 markus 305: break;
306: }
1.128 fgsch 307: if (options.num_identity_files >=
308: SSH_MAX_IDENTITY_FILES)
309: fatal("Too many identity files specified "
310: "(max %d)", SSH_MAX_IDENTITY_FILES);
311: options.identity_files[options.num_identity_files++] =
312: xstrdup(optarg);
1.31 markus 313: break;
1.127 markus 314: case 'I':
315: #ifdef SMARTCARD
1.133 markus 316: options.smartcard_device = xstrdup(optarg);
1.137 jakob 317: #else
1.127 markus 318: fprintf(stderr, "no support for smartcards.\n");
1.137 jakob 319: #endif
1.127 markus 320: break;
1.31 markus 321: case 't':
1.79 markus 322: if (tty_flag)
323: force_tty_flag = 1;
1.31 markus 324: tty_flag = 1;
325: break;
326: case 'v':
1.197 markus 327: if (debug_flag == 0) {
1.66 markus 328: debug_flag = 1;
329: options.log_level = SYSLOG_LEVEL_DEBUG1;
1.197 markus 330: } else {
331: if (options.log_level < SYSLOG_LEVEL_DEBUG3)
332: options.log_level++;
1.66 markus 333: break;
1.197 markus 334: }
1.66 markus 335: /* fallthrough */
1.31 markus 336: case 'V':
1.96 deraadt 337: fprintf(stderr,
1.193 djm 338: "%s, SSH protocols %d.%d/%d.%d, %s\n",
1.46 markus 339: SSH_VERSION,
340: PROTOCOL_MAJOR_1, PROTOCOL_MINOR_1,
1.96 deraadt 341: PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2,
1.193 djm 342: SSLeay_version(SSLEAY_VERSION));
1.31 markus 343: if (opt == 'V')
344: exit(0);
345: break;
346: case 'q':
347: options.log_level = SYSLOG_LEVEL_QUIET;
348: break;
349: case 'e':
350: if (optarg[0] == '^' && optarg[2] == 0 &&
1.128 fgsch 351: (u_char) optarg[1] >= 64 &&
352: (u_char) optarg[1] < 128)
1.78 markus 353: options.escape_char = (u_char) optarg[1] & 31;
1.31 markus 354: else if (strlen(optarg) == 1)
1.78 markus 355: options.escape_char = (u_char) optarg[0];
1.31 markus 356: else if (strcmp(optarg, "none") == 0)
1.119 stevesk 357: options.escape_char = SSH_ESCAPECHAR_NONE;
1.31 markus 358: else {
1.128 fgsch 359: fprintf(stderr, "Bad escape character '%s'.\n",
360: optarg);
1.31 markus 361: exit(1);
362: }
363: break;
364: case 'c':
1.49 markus 365: if (ciphers_valid(optarg)) {
366: /* SSH2 only */
367: options.ciphers = xstrdup(optarg);
1.51 markus 368: options.cipher = SSH_CIPHER_ILLEGAL;
1.49 markus 369: } else {
370: /* SSH1 only */
1.74 markus 371: options.cipher = cipher_number(optarg);
372: if (options.cipher == -1) {
1.128 fgsch 373: fprintf(stderr,
374: "Unknown cipher type '%s'\n",
375: optarg);
1.49 markus 376: exit(1);
377: }
1.128 fgsch 378: if (options.cipher == SSH_CIPHER_3DES)
1.74 markus 379: options.ciphers = "3des-cbc";
1.128 fgsch 380: else if (options.cipher == SSH_CIPHER_BLOWFISH)
1.74 markus 381: options.ciphers = "blowfish-cbc";
1.128 fgsch 382: else
1.74 markus 383: options.ciphers = (char *)-1;
1.95 markus 384: }
385: break;
386: case 'm':
387: if (mac_valid(optarg))
388: options.macs = xstrdup(optarg);
389: else {
1.128 fgsch 390: fprintf(stderr, "Unknown mac type '%s'\n",
391: optarg);
1.95 markus 392: exit(1);
1.31 markus 393: }
394: break;
395: case 'p':
1.113 stevesk 396: options.port = a2port(optarg);
397: if (options.port == 0) {
1.109 markus 398: fprintf(stderr, "Bad port '%s'\n", optarg);
399: exit(1);
400: }
1.31 markus 401: break;
402: case 'l':
403: options.user = optarg;
404: break;
1.141 stevesk 405:
406: case 'L':
1.31 markus 407: case 'R':
1.141 stevesk 408: if (sscanf(optarg, "%5[0-9]:%255[^:]:%5[0-9]",
409: sfwd_port, buf, sfwd_host_port) != 3 &&
410: sscanf(optarg, "%5[0-9]/%255[^/]/%5[0-9]",
411: sfwd_port, buf, sfwd_host_port) != 3) {
1.128 fgsch 412: fprintf(stderr,
1.141 stevesk 413: "Bad forwarding specification '%s'\n",
1.128 fgsch 414: optarg);
1.31 markus 415: usage();
416: /* NOTREACHED */
417: }
1.141 stevesk 418: if ((fwd_port = a2port(sfwd_port)) == 0 ||
1.165 markus 419: (fwd_host_port = a2port(sfwd_host_port)) == 0) {
1.128 fgsch 420: fprintf(stderr,
1.141 stevesk 421: "Bad forwarding port(s) '%s'\n", optarg);
422: exit(1);
1.31 markus 423: }
1.141 stevesk 424: if (opt == 'L')
425: add_local_forward(&options, fwd_port, buf,
426: fwd_host_port);
427: else if (opt == 'R')
428: add_remote_forward(&options, fwd_port, buf,
1.151 deraadt 429: fwd_host_port);
1.31 markus 430: break;
1.108 markus 431:
432: case 'D':
1.113 stevesk 433: fwd_port = a2port(optarg);
434: if (fwd_port == 0) {
1.128 fgsch 435: fprintf(stderr, "Bad dynamic port '%s'\n",
436: optarg);
1.109 markus 437: exit(1);
438: }
1.108 markus 439: add_local_forward(&options, fwd_port, "socks4", 0);
440: break;
441:
1.31 markus 442: case 'C':
443: options.compression = 1;
444: break;
1.45 markus 445: case 'N':
446: no_shell_flag = 1;
447: no_tty_flag = 1;
448: break;
449: case 'T':
450: no_tty_flag = 1;
451: break;
1.31 markus 452: case 'o':
453: dummy = 1;
1.128 fgsch 454: if (process_config_line(&options, host ? host : "",
455: optarg, "command-line", 0, &dummy) != 0)
1.31 markus 456: exit(1);
457: break;
1.85 djm 458: case 's':
459: subsystem_flag = 1;
1.117 markus 460: break;
461: case 'b':
462: options.bind_address = optarg;
1.85 djm 463: break;
1.139 markus 464: case 'F':
465: config = optarg;
466: break;
1.31 markus 467: default:
468: usage();
1.1 deraadt 469: }
1.31 markus 470: }
471:
1.128 fgsch 472: ac -= optind;
473: av += optind;
474:
475: if (ac > 0 && !host && **av != '-') {
1.188 markus 476: if (strrchr(*av, '@')) {
1.128 fgsch 477: p = xstrdup(*av);
1.188 markus 478: cp = strrchr(p, '@');
1.128 fgsch 479: if (cp == NULL || cp == p)
480: usage();
481: options.user = p;
482: *cp = '\0';
483: host = ++cp;
484: } else
485: host = *av;
1.189 millert 486: if (ac > 1) {
487: optind = optreset = 1;
1.128 fgsch 488: goto again;
489: }
1.189 millert 490: ac--, av++;
1.128 fgsch 491: }
492:
1.31 markus 493: /* Check that we got a host name. */
494: if (!host)
495: usage();
496:
1.54 markus 497: SSLeay_add_all_algorithms();
1.72 markus 498: ERR_load_crypto_strings();
1.31 markus 499:
500: /* Initialize the command to execute on remote host. */
501: buffer_init(&command);
1.1 deraadt 502:
1.33 markus 503: /*
504: * Save the command to execute on the remote host in a buffer. There
505: * is no limit on the length of the command, except by the maximum
506: * packet size. Also sets the tty flag if there is no command.
507: */
1.128 fgsch 508: if (!ac) {
1.31 markus 509: /* No command specified - execute shell on a tty. */
510: tty_flag = 1;
1.85 djm 511: if (subsystem_flag) {
1.128 fgsch 512: fprintf(stderr,
513: "You must specify a subsystem to invoke.\n");
1.85 djm 514: usage();
515: }
1.31 markus 516: } else {
1.128 fgsch 517: /* A command has been specified. Store it into the buffer. */
518: for (i = 0; i < ac; i++) {
519: if (i)
1.31 markus 520: buffer_append(&command, " ", 1);
521: buffer_append(&command, av[i], strlen(av[i]));
522: }
523: }
524:
525: /* Cannot fork to background if no command. */
1.63 markus 526: if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag)
1.31 markus 527: fatal("Cannot fork into background without a command to execute.");
528:
529: /* Allocate a tty by default if no command specified. */
530: if (buffer_len(&command) == 0)
531: tty_flag = 1;
532:
1.180 deraadt 533: /* Force no tty */
1.75 markus 534: if (no_tty_flag)
535: tty_flag = 0;
1.31 markus 536: /* Do not allocate a tty if stdin is not a tty. */
1.79 markus 537: if (!isatty(fileno(stdin)) && !force_tty_flag) {
1.31 markus 538: if (tty_flag)
1.191 itojun 539: logit("Pseudo-terminal will not be allocated because stdin is not a terminal.");
1.31 markus 540: tty_flag = 0;
541: }
1.45 markus 542:
1.101 markus 543: /*
544: * Initialize "log" output. Since we are the client all output
545: * actually goes to stderr.
546: */
1.111 markus 547: log_init(av[0], options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level,
548: SYSLOG_FACILITY_USER, 1);
1.31 markus 549:
1.139 markus 550: /*
551: * Read per-user configuration file. Ignore the system wide config
552: * file if the user specifies a config file on the command line.
553: */
554: if (config != NULL) {
1.142 stevesk 555: if (!read_config_file(config, host, &options))
556: fatal("Can't open user config file %.100s: "
557: "%.100s", config, strerror(errno));
1.139 markus 558: } else {
559: snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir,
560: _PATH_SSH_USER_CONFFILE);
1.145 markus 561: (void)read_config_file(buf, host, &options);
1.139 markus 562:
1.145 markus 563: /* Read systemwide configuration file after use config. */
1.142 stevesk 564: (void)read_config_file(_PATH_HOST_CONFIG_FILE, host, &options);
1.139 markus 565: }
1.31 markus 566:
567: /* Fill configuration defaults. */
568: fill_default_options(&options);
569:
1.196 djm 570: channel_set_af(options.address_family);
571:
1.31 markus 572: /* reinit */
1.101 markus 573: log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 1);
1.31 markus 574:
575: if (options.user == NULL)
576: options.user = xstrdup(pw->pw_name);
577:
578: if (options.hostname != NULL)
579: host = options.hostname;
1.195 markus 580:
581: /* force lowercase for hostkey matching */
582: if (options.host_key_alias != NULL) {
583: for (p = options.host_key_alias; *p; p++)
584: if (isupper(*p))
585: *p = tolower(*p);
586: }
1.190 markus 587:
588: if (options.proxy_command != NULL &&
589: strcmp(options.proxy_command, "none") == 0)
590: options.proxy_command = NULL;
1.31 markus 591:
592: /* Disable rhosts authentication if not running as root. */
593: if (original_effective_uid != 0 || !options.use_privileged_port) {
1.77 markus 594: debug("Rhosts Authentication disabled, "
1.71 markus 595: "originating port will not be trusted.");
1.31 markus 596: options.rhosts_authentication = 0;
597: }
1.77 markus 598: /* Open a connection to the remote host. */
1.31 markus 599:
1.196 djm 600: if (ssh_connect(host, &hostaddr, options.port,
601: options.address_family, options.connection_attempts,
1.177 markus 602: original_effective_uid == 0 && options.use_privileged_port,
1.179 markus 603: options.proxy_command) != 0)
1.178 markus 604: exit(1);
1.31 markus 605:
1.33 markus 606: /*
607: * If we successfully made the connection, load the host private key
608: * in case we will need it later for combined rsa-rhosts
609: * authentication. This must be done before releasing extra
610: * privileges, because the file is only readable by root.
1.174 markus 611: * If we cannot access the private keys, load the public keys
612: * instead and try to execute the ssh-keysign helper instead.
1.33 markus 613: */
1.112 markus 614: sensitive_data.nkeys = 0;
615: sensitive_data.keys = NULL;
1.173 markus 616: sensitive_data.external_keysign = 0;
1.178 markus 617: if (options.rhosts_rsa_authentication ||
618: options.hostbased_authentication) {
1.112 markus 619: sensitive_data.nkeys = 3;
1.180 deraadt 620: sensitive_data.keys = xmalloc(sensitive_data.nkeys *
621: sizeof(Key));
1.177 markus 622:
623: PRIV_START;
1.112 markus 624: sensitive_data.keys[0] = key_load_private_type(KEY_RSA1,
1.105 markus 625: _PATH_HOST_KEY_FILE, "", NULL);
1.112 markus 626: sensitive_data.keys[1] = key_load_private_type(KEY_DSA,
627: _PATH_HOST_DSA_KEY_FILE, "", NULL);
628: sensitive_data.keys[2] = key_load_private_type(KEY_RSA,
629: _PATH_HOST_RSA_KEY_FILE, "", NULL);
1.177 markus 630: PRIV_END;
1.173 markus 631:
1.181 markus 632: if (options.hostbased_authentication == 1 &&
633: sensitive_data.keys[0] == NULL &&
1.173 markus 634: sensitive_data.keys[1] == NULL &&
635: sensitive_data.keys[2] == NULL) {
636: sensitive_data.keys[1] = key_load_public(
637: _PATH_HOST_DSA_KEY_FILE, NULL);
638: sensitive_data.keys[2] = key_load_public(
639: _PATH_HOST_RSA_KEY_FILE, NULL);
640: sensitive_data.external_keysign = 1;
641: }
1.31 markus 642: }
1.33 markus 643: /*
644: * Get rid of any extra privileges that we may have. We will no
645: * longer need them. Also, extra privileges could make it very hard
646: * to read identity files and other non-world-readable files from the
647: * user's home directory if it happens to be on a NFS volume where
648: * root is mapped to nobody.
649: */
1.177 markus 650: seteuid(original_real_uid);
651: setuid(original_real_uid);
1.31 markus 652:
1.33 markus 653: /*
654: * Now that we are back to our own permissions, create ~/.ssh
655: * directory if it doesn\'t already exist.
656: */
1.138 jakob 657: snprintf(buf, sizeof buf, "%.100s%s%.100s", pw->pw_dir, strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR);
1.31 markus 658: if (stat(buf, &st) < 0)
1.57 djm 659: if (mkdir(buf, 0700) < 0)
1.31 markus 660: error("Could not create directory '%.200s'.", buf);
661:
1.104 markus 662: /* load options.identity_files */
663: load_public_identity_files();
664:
665: /* Expand ~ in known host file names. */
666: /* XXX mem-leaks: */
1.72 markus 667: options.system_hostfile =
668: tilde_expand_filename(options.system_hostfile, original_real_uid);
669: options.user_hostfile =
670: tilde_expand_filename(options.user_hostfile, original_real_uid);
671: options.system_hostfile2 =
672: tilde_expand_filename(options.system_hostfile2, original_real_uid);
673: options.user_hostfile2 =
674: tilde_expand_filename(options.user_hostfile2, original_real_uid);
1.149 markus 675:
676: signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
1.31 markus 677:
678: /* Log into the remote system. This never returns if the login fails. */
1.173 markus 679: ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr, pw);
1.31 markus 680:
1.112 markus 681: /* We no longer need the private host keys. Clear them now. */
682: if (sensitive_data.nkeys != 0) {
683: for (i = 0; i < sensitive_data.nkeys; i++) {
684: if (sensitive_data.keys[i] != NULL) {
685: /* Destroys contents safely */
686: debug3("clear hostkey %d", i);
687: key_free(sensitive_data.keys[i]);
688: sensitive_data.keys[i] = NULL;
689: }
690: }
691: xfree(sensitive_data.keys);
1.134 markus 692: }
693: for (i = 0; i < options.num_identity_files; i++) {
694: if (options.identity_files[i]) {
695: xfree(options.identity_files[i]);
696: options.identity_files[i] = NULL;
697: }
698: if (options.identity_keys[i]) {
699: key_free(options.identity_keys[i]);
700: options.identity_keys[i] = NULL;
701: }
1.112 markus 702: }
1.31 markus 703:
1.45 markus 704: exit_status = compat20 ? ssh_session2() : ssh_session();
705: packet_close();
1.186 djm 706:
707: /*
708: * Send SIGHUP to proxy command if used. We don't wait() in
709: * case it hangs and instead rely on init to reap the child
710: */
711: if (proxy_command_pid > 1)
712: kill(proxy_command_pid, SIGHUP);
713:
1.45 markus 714: return exit_status;
715: }
716:
1.126 itojun 717: static void
1.150 stevesk 718: x11_get_proto(char **_proto, char **_data)
1.50 markus 719: {
720: char line[512];
1.150 stevesk 721: static char proto[512], data[512];
1.50 markus 722: FILE *f;
723: int got_data = 0, i;
1.159 stevesk 724: char *display;
1.182 stevesk 725: struct stat st;
1.50 markus 726:
1.150 stevesk 727: *_proto = proto;
728: *_data = data;
729: proto[0] = data[0] = '\0';
1.182 stevesk 730: if (!options.xauth_location ||
731: (stat(options.xauth_location, &st) == -1)) {
732: debug("No xauth program.");
733: } else {
734: if ((display = getenv("DISPLAY")) == NULL) {
735: debug("x11_get_proto: DISPLAY not set");
736: return;
737: }
1.55 markus 738: /* Try to get Xauthority information for the display. */
1.159 stevesk 739: if (strncmp(display, "localhost:", 10) == 0)
740: /*
741: * Handle FamilyLocal case where $DISPLAY does
742: * not match an authorization entry. For this we
743: * just try "xauth list unix:displaynum.screennum".
744: * XXX: "localhost" match to determine FamilyLocal
745: * is not perfect.
746: */
1.171 stevesk 747: snprintf(line, sizeof line, "%s list unix:%s 2>"
1.159 stevesk 748: _PATH_DEVNULL, options.xauth_location, display+10);
749: else
1.171 stevesk 750: snprintf(line, sizeof line, "%s list %.200s 2>"
1.159 stevesk 751: _PATH_DEVNULL, options.xauth_location, display);
1.182 stevesk 752: debug2("x11_get_proto: %s", line);
1.55 markus 753: f = popen(line, "r");
754: if (f && fgets(line, sizeof(line), f) &&
1.150 stevesk 755: sscanf(line, "%*s %511s %511s", proto, data) == 2)
1.55 markus 756: got_data = 1;
757: if (f)
758: pclose(f);
759: }
1.50 markus 760: /*
761: * If we didn't get authentication data, just make up some
762: * data. The forwarding code will check the validity of the
763: * response anyway, and substitute this data. The X11
764: * server, however, will ignore this fake data and use
765: * whatever authentication mechanisms it was using otherwise
766: * for the local connection.
767: */
768: if (!got_data) {
769: u_int32_t rand = 0;
770:
1.191 itojun 771: logit("Warning: No xauth data; using fake authentication data for X11 forwarding.");
1.150 stevesk 772: strlcpy(proto, "MIT-MAGIC-COOKIE-1", sizeof proto);
1.50 markus 773: for (i = 0; i < 16; i++) {
774: if (i % 4 == 0)
775: rand = arc4random();
1.150 stevesk 776: snprintf(data + 2 * i, sizeof data - 2 * i, "%02x", rand & 0xff);
1.50 markus 777: rand >>= 8;
778: }
779: }
780: }
781:
1.126 itojun 782: static void
1.70 markus 783: ssh_init_forwarding(void)
784: {
1.86 markus 785: int success = 0;
1.70 markus 786: int i;
1.86 markus 787:
1.70 markus 788: /* Initiate local TCP/IP port forwardings. */
789: for (i = 0; i < options.num_local_forwards; i++) {
790: debug("Connections to local port %d forwarded to remote address %.200s:%d",
791: options.local_forwards[i].port,
792: options.local_forwards[i].host,
793: options.local_forwards[i].host_port);
1.158 markus 794: success += channel_setup_local_fwd_listener(
1.70 markus 795: options.local_forwards[i].port,
796: options.local_forwards[i].host,
797: options.local_forwards[i].host_port,
798: options.gateway_ports);
799: }
1.86 markus 800: if (i > 0 && success == 0)
801: error("Could not request local forwarding.");
1.70 markus 802:
803: /* Initiate remote TCP/IP port forwardings. */
804: for (i = 0; i < options.num_remote_forwards; i++) {
805: debug("Connections to remote port %d forwarded to local address %.200s:%d",
806: options.remote_forwards[i].port,
807: options.remote_forwards[i].host,
808: options.remote_forwards[i].host_port);
809: channel_request_remote_forwarding(
810: options.remote_forwards[i].port,
811: options.remote_forwards[i].host,
812: options.remote_forwards[i].host_port);
813: }
814: }
815:
1.126 itojun 816: static void
1.70 markus 817: check_agent_present(void)
818: {
819: if (options.forward_agent) {
820: /* Clear agent forwarding if we don\'t have an agent. */
1.185 stevesk 821: if (!ssh_agent_present())
1.70 markus 822: options.forward_agent = 0;
823: }
824: }
825:
1.126 itojun 826: static int
1.45 markus 827: ssh_session(void)
828: {
829: int type;
830: int interactive = 0;
831: int have_tty = 0;
832: struct winsize ws;
833: char *cp;
834:
1.31 markus 835: /* Enable compression if requested. */
836: if (options.compression) {
837: debug("Requesting compression at level %d.", options.compression_level);
838:
839: if (options.compression_level < 1 || options.compression_level > 9)
840: fatal("Compression level must be from 1 (fast) to 9 (slow, best).");
841:
842: /* Send the request. */
843: packet_start(SSH_CMSG_REQUEST_COMPRESSION);
844: packet_put_int(options.compression_level);
845: packet_send();
846: packet_write_wait();
1.156 markus 847: type = packet_read();
1.31 markus 848: if (type == SSH_SMSG_SUCCESS)
849: packet_start_compression(options.compression_level);
850: else if (type == SSH_SMSG_FAILURE)
1.191 itojun 851: logit("Warning: Remote host refused compression.");
1.31 markus 852: else
853: packet_disconnect("Protocol error waiting for compression response.");
854: }
855: /* Allocate a pseudo tty if appropriate. */
856: if (tty_flag) {
857: debug("Requesting pty.");
858:
859: /* Start the packet. */
860: packet_start(SSH_CMSG_REQUEST_PTY);
861:
862: /* Store TERM in the packet. There is no limit on the
863: length of the string. */
864: cp = getenv("TERM");
865: if (!cp)
866: cp = "";
1.124 markus 867: packet_put_cstring(cp);
1.31 markus 868:
869: /* Store window size in the packet. */
870: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
871: memset(&ws, 0, sizeof(ws));
872: packet_put_int(ws.ws_row);
873: packet_put_int(ws.ws_col);
874: packet_put_int(ws.ws_xpixel);
875: packet_put_int(ws.ws_ypixel);
876:
877: /* Store tty modes in the packet. */
1.115 stevesk 878: tty_make_modes(fileno(stdin), NULL);
1.31 markus 879:
880: /* Send the packet, and wait for it to leave. */
881: packet_send();
882: packet_write_wait();
883:
884: /* Read response from the server. */
1.156 markus 885: type = packet_read();
1.43 markus 886: if (type == SSH_SMSG_SUCCESS) {
1.31 markus 887: interactive = 1;
1.45 markus 888: have_tty = 1;
1.43 markus 889: } else if (type == SSH_SMSG_FAILURE)
1.191 itojun 890: logit("Warning: Remote host failed or refused to allocate a pseudo tty.");
1.31 markus 891: else
892: packet_disconnect("Protocol error waiting for pty request response.");
893: }
894: /* Request X11 forwarding if enabled and DISPLAY is set. */
895: if (options.forward_x11 && getenv("DISPLAY") != NULL) {
1.150 stevesk 896: char *proto, *data;
1.50 markus 897: /* Get reasonable local authentication information. */
1.150 stevesk 898: x11_get_proto(&proto, &data);
1.50 markus 899: /* Request forwarding with authentication spoofing. */
1.31 markus 900: debug("Requesting X11 forwarding with authentication spoofing.");
1.50 markus 901: x11_request_forwarding_with_spoofing(0, proto, data);
1.31 markus 902:
903: /* Read response from the server. */
1.156 markus 904: type = packet_read();
1.31 markus 905: if (type == SSH_SMSG_SUCCESS) {
906: interactive = 1;
1.50 markus 907: } else if (type == SSH_SMSG_FAILURE) {
1.191 itojun 908: logit("Warning: Remote host denied X11 forwarding.");
1.50 markus 909: } else {
1.31 markus 910: packet_disconnect("Protocol error waiting for X11 forwarding");
1.50 markus 911: }
1.31 markus 912: }
913: /* Tell the packet module whether this is an interactive session. */
1.80 markus 914: packet_set_interactive(interactive);
1.31 markus 915:
916: /* Request authentication agent forwarding if appropriate. */
1.70 markus 917: check_agent_present();
918:
1.31 markus 919: if (options.forward_agent) {
920: debug("Requesting authentication agent forwarding.");
921: auth_request_forwarding();
922:
923: /* Read response from the server. */
1.156 markus 924: type = packet_read();
1.155 markus 925: packet_check_eom();
1.31 markus 926: if (type != SSH_SMSG_SUCCESS)
1.191 itojun 927: logit("Warning: Remote host denied authentication agent forwarding.");
1.31 markus 928: }
929:
1.70 markus 930: /* Initiate port forwardings. */
931: ssh_init_forwarding();
1.34 markus 932:
933: /* If requested, let ssh continue in the background. */
1.48 markus 934: if (fork_after_authentication_flag)
1.34 markus 935: if (daemon(1, 1) < 0)
936: fatal("daemon() failed: %.200s", strerror(errno));
1.31 markus 937:
1.33 markus 938: /*
939: * If a command was specified on the command line, execute the
940: * command now. Otherwise request the server to start a shell.
941: */
1.31 markus 942: if (buffer_len(&command) > 0) {
943: int len = buffer_len(&command);
944: if (len > 900)
945: len = 900;
1.152 stevesk 946: debug("Sending command: %.*s", len, (u_char *)buffer_ptr(&command));
1.31 markus 947: packet_start(SSH_CMSG_EXEC_CMD);
948: packet_put_string(buffer_ptr(&command), buffer_len(&command));
949: packet_send();
950: packet_write_wait();
951: } else {
952: debug("Requesting shell.");
953: packet_start(SSH_CMSG_EXEC_SHELL);
954: packet_send();
955: packet_write_wait();
956: }
957:
958: /* Enter the interactive session. */
1.119 stevesk 959: return client_loop(have_tty, tty_flag ?
960: options.escape_char : SSH_ESCAPECHAR_NONE, 0);
1.45 markus 961: }
962:
1.126 itojun 963: static void
1.157 markus 964: client_subsystem_reply(int type, u_int32_t seq, void *ctxt)
1.89 markus 965: {
966: int id, len;
967:
968: id = packet_get_int();
969: len = buffer_len(&command);
1.100 markus 970: if (len > 900)
971: len = 900;
1.155 markus 972: packet_check_eom();
1.89 markus 973: if (type == SSH2_MSG_CHANNEL_FAILURE)
974: fatal("Request for subsystem '%.*s' failed on channel %d",
1.152 stevesk 975: len, (u_char *)buffer_ptr(&command), id);
1.170 markus 976: }
977:
978: void
979: client_global_request_reply(int type, u_int32_t seq, void *ctxt)
980: {
981: int i;
982:
983: i = client_global_request_id++;
984: if (i >= options.num_remote_forwards) {
985: debug("client_global_request_reply: too many replies %d > %d",
986: i, options.num_remote_forwards);
987: return;
988: }
989: debug("remote forward %s for: listen %d, connect %s:%d",
990: type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
991: options.remote_forwards[i].port,
992: options.remote_forwards[i].host,
993: options.remote_forwards[i].host_port);
994: if (type == SSH2_MSG_REQUEST_FAILURE)
1.191 itojun 995: logit("Warning: remote port forwarding failed for listen port %d",
1.170 markus 996: options.remote_forwards[i].port);
1.89 markus 997: }
998:
1.143 markus 999: /* request pty/x11/agent/tcpfwd/shell for channel */
1.126 itojun 1000: static void
1.143 markus 1001: ssh_session2_setup(int id, void *arg)
1.45 markus 1002: {
1003: int len;
1.80 markus 1004: int interactive = 0;
1.115 stevesk 1005: struct termios tio;
1.80 markus 1006:
1.187 markus 1007: debug2("ssh_session2_setup: id %d", id);
1.31 markus 1008:
1.45 markus 1009: if (tty_flag) {
1010: struct winsize ws;
1011: char *cp;
1012: cp = getenv("TERM");
1013: if (!cp)
1014: cp = "";
1015: /* Store window size in the packet. */
1016: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
1017: memset(&ws, 0, sizeof(ws));
1018:
1019: channel_request_start(id, "pty-req", 0);
1020: packet_put_cstring(cp);
1021: packet_put_int(ws.ws_col);
1022: packet_put_int(ws.ws_row);
1023: packet_put_int(ws.ws_xpixel);
1024: packet_put_int(ws.ws_ypixel);
1.115 stevesk 1025: tio = get_saved_tio();
1026: tty_make_modes(/*ignored*/ 0, &tio);
1.45 markus 1027: packet_send();
1.80 markus 1028: interactive = 1;
1.45 markus 1029: /* XXX wait for reply */
1030: }
1.50 markus 1031: if (options.forward_x11 &&
1032: getenv("DISPLAY") != NULL) {
1.150 stevesk 1033: char *proto, *data;
1.50 markus 1034: /* Get reasonable local authentication information. */
1.150 stevesk 1035: x11_get_proto(&proto, &data);
1.50 markus 1036: /* Request forwarding with authentication spoofing. */
1037: debug("Requesting X11 forwarding with authentication spoofing.");
1038: x11_request_forwarding_with_spoofing(id, proto, data);
1.80 markus 1039: interactive = 1;
1.50 markus 1040: /* XXX wait for reply */
1041: }
1042:
1.70 markus 1043: check_agent_present();
1044: if (options.forward_agent) {
1045: debug("Requesting authentication agent forwarding.");
1046: channel_request_start(id, "auth-agent-req@openssh.com", 0);
1047: packet_send();
1048: }
1049:
1.45 markus 1050: len = buffer_len(&command);
1051: if (len > 0) {
1052: if (len > 900)
1053: len = 900;
1.85 djm 1054: if (subsystem_flag) {
1.152 stevesk 1055: debug("Sending subsystem: %.*s", len, (u_char *)buffer_ptr(&command));
1.89 markus 1056: channel_request_start(id, "subsystem", /*want reply*/ 1);
1057: /* register callback for reply */
1.172 deraadt 1058: /* XXX we assume that client_loop has already been called */
1.89 markus 1059: dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &client_subsystem_reply);
1060: dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &client_subsystem_reply);
1.85 djm 1061: } else {
1.152 stevesk 1062: debug("Sending command: %.*s", len, (u_char *)buffer_ptr(&command));
1.85 djm 1063: channel_request_start(id, "exec", 0);
1064: }
1.100 markus 1065: packet_put_string(buffer_ptr(&command), buffer_len(&command));
1.45 markus 1066: packet_send();
1067: } else {
1.161 markus 1068: channel_request_start(id, "shell", 0);
1069: packet_send();
1.45 markus 1070: }
1.90 markus 1071:
1.80 markus 1072: packet_set_interactive(interactive);
1.45 markus 1073: }
1074:
1.143 markus 1075: /* open new channel for a session */
1.126 itojun 1076: static int
1.143 markus 1077: ssh_session2_open(void)
1.45 markus 1078: {
1.118 markus 1079: Channel *c;
1080: int window, packetmax, in, out, err;
1.60 markus 1081:
1.62 markus 1082: if (stdin_null_flag) {
1.93 itojun 1083: in = open(_PATH_DEVNULL, O_RDONLY);
1.62 markus 1084: } else {
1085: in = dup(STDIN_FILENO);
1086: }
1.60 markus 1087: out = dup(STDOUT_FILENO);
1088: err = dup(STDERR_FILENO);
1.45 markus 1089:
1090: if (in < 0 || out < 0 || err < 0)
1.62 markus 1091: fatal("dup() in/out/err failed");
1.45 markus 1092:
1.69 markus 1093: /* enable nonblocking unless tty */
1094: if (!isatty(in))
1095: set_nonblock(in);
1096: if (!isatty(out))
1097: set_nonblock(out);
1098: if (!isatty(err))
1099: set_nonblock(err);
1100:
1.65 markus 1101: window = CHAN_SES_WINDOW_DEFAULT;
1102: packetmax = CHAN_SES_PACKET_DEFAULT;
1.164 markus 1103: if (tty_flag) {
1104: window >>= 1;
1105: packetmax >>= 1;
1.45 markus 1106: }
1.118 markus 1107: c = channel_new(
1.45 markus 1108: "session", SSH_CHANNEL_OPENING, in, out, err,
1.65 markus 1109: window, packetmax, CHAN_EXTENDED_WRITE,
1.192 markus 1110: "client-session", /*nonblock*/0);
1.45 markus 1111:
1.143 markus 1112: debug3("ssh_session2_open: channel_new: %d", c->self);
1.106 markus 1113:
1.122 markus 1114: channel_send_open(c->self);
1.143 markus 1115: if (!no_shell_flag)
1.160 markus 1116: channel_register_confirm(c->self, ssh_session2_setup);
1.106 markus 1117:
1.118 markus 1118: return c->self;
1.106 markus 1119: }
1120:
1.126 itojun 1121: static int
1.106 markus 1122: ssh_session2(void)
1123: {
1.143 markus 1124: int id = -1;
1.106 markus 1125:
1126: /* XXX should be pre-session */
1127: ssh_init_forwarding();
1128:
1.143 markus 1129: if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN))
1130: id = ssh_session2_open();
1.106 markus 1131:
1132: /* If requested, let ssh continue in the background. */
1133: if (fork_after_authentication_flag)
1134: if (daemon(1, 1) < 0)
1135: fatal("daemon() failed: %.200s", strerror(errno));
1.31 markus 1136:
1.119 stevesk 1137: return client_loop(tty_flag, tty_flag ?
1138: options.escape_char : SSH_ESCAPECHAR_NONE, id);
1.72 markus 1139: }
1140:
1.126 itojun 1141: static void
1.104 markus 1142: load_public_identity_files(void)
1143: {
1144: char *filename;
1.167 markus 1145: int i = 0;
1.104 markus 1146: Key *public;
1.167 markus 1147: #ifdef SMARTCARD
1148: Key **keys;
1.104 markus 1149:
1.133 markus 1150: if (options.smartcard_device != NULL &&
1.167 markus 1151: options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
1152: (keys = sc_get_keys(options.smartcard_device, NULL)) != NULL ) {
1153: int count = 0;
1154: for (i = 0; keys[i] != NULL; i++) {
1155: count++;
1156: memmove(&options.identity_files[1], &options.identity_files[0],
1157: sizeof(char *) * (SSH_MAX_IDENTITY_FILES - 1));
1158: memmove(&options.identity_keys[1], &options.identity_keys[0],
1159: sizeof(Key *) * (SSH_MAX_IDENTITY_FILES - 1));
1160: options.num_identity_files++;
1161: options.identity_keys[0] = keys[i];
1.194 markus 1162: options.identity_files[0] = sc_get_key_label(keys[i]);
1.167 markus 1163: }
1.168 markus 1164: if (options.num_identity_files > SSH_MAX_IDENTITY_FILES)
1165: options.num_identity_files = SSH_MAX_IDENTITY_FILES;
1.167 markus 1166: i = count;
1167: xfree(keys);
1.127 markus 1168: }
1.136 jakob 1169: #endif /* SMARTCARD */
1.131 millert 1170: for (; i < options.num_identity_files; i++) {
1171: filename = tilde_expand_filename(options.identity_files[i],
1172: original_real_uid);
1173: public = key_load_public(filename, NULL);
1174: debug("identity file %s type %d", filename,
1175: public ? public->type : -1);
1176: xfree(options.identity_files[i]);
1177: options.identity_files[i] = filename;
1178: options.identity_keys[i] = public;
1179: }
1.1 deraadt 1180: }
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