Annotation of src/usr.bin/ssh/ssh.c, Revision 1.168
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.
16: *
17: * Modified to work with SSL by Niels Provos <provos@citi.umich.edu>
18: * in Canada (German citizen).
19: *
20: * Redistribution and use in source and binary forms, with or without
21: * modification, are permitted provided that the following conditions
22: * are met:
23: * 1. Redistributions of source code must retain the above copyright
24: * notice, this list of conditions and the following disclaimer.
25: * 2. Redistributions in binary form must reproduce the above copyright
26: * notice, this list of conditions and the following disclaimer in the
27: * documentation and/or other materials provided with the distribution.
28: *
29: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
30: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
31: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
32: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
33: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
34: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
35: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
36: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
37: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
38: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.32 deraadt 39: */
1.1 deraadt 40:
41: #include "includes.h"
1.168 ! markus 42: RCSID("$OpenBSD: ssh.c,v 1.167 2002/03/25 17:34:27 markus Exp $");
1.49 markus 43:
44: #include <openssl/evp.h>
1.72 markus 45: #include <openssl/err.h>
1.1 deraadt 46:
1.84 markus 47: #include "ssh.h"
48: #include "ssh1.h"
49: #include "ssh2.h"
50: #include "compat.h"
51: #include "cipher.h"
1.1 deraadt 52: #include "xmalloc.h"
53: #include "packet.h"
54: #include "buffer.h"
55: #include "uidswap.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:
1.37 markus 78: /* Flag indicating whether IPv4 or IPv6. This can be set on the command line.
79: Default value is AF_UNSPEC means both IPv4 and IPv6. */
80: int IPv4or6 = AF_UNSPEC;
81:
1.31 markus 82: /* Flag indicating whether debug mode is on. This can be set on the command line. */
1.1 deraadt 83: int debug_flag = 0;
84:
1.46 markus 85: /* Flag indicating whether a tty should be allocated */
1.1 deraadt 86: int tty_flag = 0;
1.79 markus 87: int no_tty_flag = 0;
88: int force_tty_flag = 0;
1.1 deraadt 89:
1.45 markus 90: /* don't exec a shell */
91: int no_shell_flag = 0;
92:
1.33 markus 93: /*
94: * Flag indicating that nothing should be read from stdin. This can be set
95: * on the command line.
96: */
1.1 deraadt 97: int stdin_null_flag = 0;
98:
1.33 markus 99: /*
100: * Flag indicating that ssh should fork after authentication. This is useful
101: * so that the pasphrase can be entered manually, and then ssh goes to the
102: * background.
103: */
1.1 deraadt 104: int fork_after_authentication_flag = 0;
105:
1.33 markus 106: /*
107: * General data structure for command line options and options configurable
108: * in configuration files. See readconf.h.
109: */
1.1 deraadt 110: Options options;
111:
1.139 markus 112: /* optional user configfile */
113: char *config = NULL;
114:
1.33 markus 115: /*
116: * Name of the host we are connecting to. This is the name given on the
117: * command line, or the HostName specified for the user-supplied name in a
118: * configuration file.
119: */
1.1 deraadt 120: char *host;
121:
1.22 provos 122: /* socket address the host resolves to */
1.37 markus 123: struct sockaddr_storage hostaddr;
1.1 deraadt 124:
1.112 markus 125: /* Private host keys. */
126: struct {
127: Key **keys;
128: int nkeys;
129: } sensitive_data;
1.1 deraadt 130:
1.10 dugsong 131: /* Original real UID. */
132: uid_t original_real_uid;
1.1 deraadt 133:
1.45 markus 134: /* command to be executed */
135: Buffer command;
136:
1.85 djm 137: /* Should we execute a command or invoke a subsystem? */
138: int subsystem_flag = 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");
1.9 dugsong 153: #ifdef AFS
1.31 markus 154: fprintf(stderr, " -k Disable Kerberos ticket and AFS token forwarding.\n");
155: #endif /* AFS */
1.88 stevesk 156: fprintf(stderr, " -X Enable X11 connection forwarding.\n");
1.120 markus 157: fprintf(stderr, " -x Disable X11 connection forwarding (default).\n");
1.99 deraadt 158: fprintf(stderr, " -i file Identity for public key authentication "
159: "(default: ~/.ssh/identity)\n");
1.135 jakob 160: #ifdef SMARTCARD
161: fprintf(stderr, " -I reader Set smartcard reader.\n");
1.137 jakob 162: #endif
1.31 markus 163: fprintf(stderr, " -t Tty; allocate a tty even if command is given.\n");
1.45 markus 164: fprintf(stderr, " -T Do not allocate a tty.\n");
1.31 markus 165: fprintf(stderr, " -v Verbose; display verbose debugging messages.\n");
1.66 markus 166: fprintf(stderr, " Multiple -v increases verbosity.\n");
1.31 markus 167: fprintf(stderr, " -V Display version number only.\n");
168: fprintf(stderr, " -P Don't allocate a privileged port.\n");
169: fprintf(stderr, " -q Quiet; don't display any warning messages.\n");
170: fprintf(stderr, " -f Fork into background after authentication.\n");
171: fprintf(stderr, " -e char Set escape character; ``none'' = disable (default: ~).\n");
172:
1.120 markus 173: fprintf(stderr, " -c cipher Select encryption algorithm\n");
1.102 stevesk 174: fprintf(stderr, " -m macs Specify MAC algorithms for protocol version 2.\n");
1.31 markus 175: fprintf(stderr, " -p port Connect to this port. Server must be on the same port.\n");
176: fprintf(stderr, " -L listen-port:host:port Forward local port to remote address\n");
177: fprintf(stderr, " -R listen-port:host:port Forward remote port to local address\n");
1.76 markus 178: fprintf(stderr, " These cause %s to listen for connections on a port, and\n", __progname);
1.31 markus 179: fprintf(stderr, " forward them to the other side by connecting to host:port.\n");
1.140 stevesk 180: fprintf(stderr, " -D port Enable dynamic application-level port forwarding.\n");
1.31 markus 181: fprintf(stderr, " -C Enable compression.\n");
1.45 markus 182: fprintf(stderr, " -N Do not execute a shell or command.\n");
1.31 markus 183: fprintf(stderr, " -g Allow remote hosts to connect to forwarded ports.\n");
1.92 jakob 184: fprintf(stderr, " -1 Force protocol version 1.\n");
185: fprintf(stderr, " -2 Force protocol version 2.\n");
1.37 markus 186: fprintf(stderr, " -4 Use IPv4 only.\n");
187: fprintf(stderr, " -6 Use IPv6 only.\n");
1.31 markus 188: fprintf(stderr, " -o 'option' Process the option as if it was read from a configuration file.\n");
1.85 djm 189: fprintf(stderr, " -s Invoke command (mandatory) as SSH2 subsystem.\n");
1.120 markus 190: fprintf(stderr, " -b addr Local IP address.\n");
1.31 markus 191: exit(1);
1.1 deraadt 192: }
193:
1.32 deraadt 194: /*
195: * Connects to the given host using rsh (or prints an error message and exits
196: * if rsh is not available). This function never returns.
197: */
1.126 itojun 198: static void
1.31 markus 199: rsh_connect(char *host, char *user, Buffer * command)
1.1 deraadt 200: {
1.31 markus 201: char *args[10];
202: int i;
203:
204: log("Using rsh. WARNING: Connection will not be encrypted.");
205: /* Build argument list for rsh. */
206: i = 0;
207: args[i++] = _PATH_RSH;
208: /* host may have to come after user on some systems */
209: args[i++] = host;
210: if (user) {
211: args[i++] = "-l";
212: args[i++] = user;
213: }
214: if (buffer_len(command) > 0) {
215: buffer_append(command, "\0", 1);
216: args[i++] = buffer_ptr(command);
217: }
218: args[i++] = NULL;
219: if (debug_flag) {
220: for (i = 0; args[i]; i++) {
221: if (i != 0)
222: fprintf(stderr, " ");
223: fprintf(stderr, "%s", args[i]);
224: }
225: fprintf(stderr, "\n");
226: }
227: execv(_PATH_RSH, args);
228: perror(_PATH_RSH);
229: exit(1);
1.1 deraadt 230: }
231:
1.126 itojun 232: static int ssh_session(void);
233: static int ssh_session2(void);
234: static void load_public_identity_files(void);
1.45 markus 235:
1.32 deraadt 236: /*
237: * Main program for the ssh client.
238: */
1.2 provos 239: int
240: main(int ac, char **av)
1.1 deraadt 241: {
1.130 markus 242: int i, opt, exit_status, cerr;
1.35 markus 243: u_short fwd_port, fwd_host_port;
1.141 stevesk 244: char sfwd_port[6], sfwd_host_port[6];
1.128 fgsch 245: char *p, *cp, buf[256];
1.31 markus 246: struct stat st;
1.98 markus 247: struct passwd *pw;
1.45 markus 248: int dummy;
1.31 markus 249: uid_t original_effective_uid;
1.144 stevesk 250: extern int optind, optreset;
251: extern char *optarg;
1.31 markus 252:
1.33 markus 253: /*
254: * Save the original real uid. It will be needed later (uid-swapping
255: * may clobber the real uid).
256: */
1.31 markus 257: original_real_uid = getuid();
258: original_effective_uid = geteuid();
259:
260: /* If we are installed setuid root be careful to not drop core. */
261: if (original_real_uid != original_effective_uid) {
262: struct rlimit rlim;
263: rlim.rlim_cur = rlim.rlim_max = 0;
264: if (setrlimit(RLIMIT_CORE, &rlim) < 0)
265: fatal("setrlimit failed: %.100s", strerror(errno));
1.1 deraadt 266: }
1.107 markus 267: /* Get user data. */
268: pw = getpwuid(original_real_uid);
269: if (!pw) {
270: log("You don't exist, go away!");
271: exit(1);
272: }
273: /* Take a copy of the returned structure. */
274: pw = pwcopy(pw);
275:
1.33 markus 276: /*
277: * Use uid-swapping to give up root privileges for the duration of
278: * option processing. We will re-instantiate the rights when we are
279: * ready to create the privileged port, and will permanently drop
280: * them when the port has been created (actually, when the connection
281: * has been made, as we may need to create the port several times).
282: */
1.107 markus 283: temporarily_use_uid(pw);
1.31 markus 284:
1.33 markus 285: /*
286: * Set our umask to something reasonable, as some files are created
287: * with the default umask. This will make them world-readable but
288: * writable only by the owner, which is ok for all files for which we
289: * don't set the modes explicitly.
290: */
1.31 markus 291: umask(022);
292:
293: /* Initialize option structure to indicate that no values have been set. */
294: initialize_options(&options);
295:
296: /* Parse command-line arguments. */
297: host = NULL;
298:
1.128 fgsch 299: again:
300: while ((opt = getopt(ac, av,
1.139 markus 301: "1246ab:c:e:fgi:kl:m:no:p:qstvxACD:F:I:L:NPR:TVX")) != -1) {
1.31 markus 302: switch (opt) {
1.91 jakob 303: case '1':
304: options.protocol = SSH_PROTO_1;
305: break;
1.47 markus 306: case '2':
307: options.protocol = SSH_PROTO_2;
308: break;
1.37 markus 309: case '4':
310: IPv4or6 = AF_INET;
311: break;
312: case '6':
313: IPv4or6 = AF_INET6;
314: break;
1.31 markus 315: case 'n':
316: stdin_null_flag = 1;
317: break;
318: case 'f':
319: fork_after_authentication_flag = 1;
320: stdin_null_flag = 1;
321: break;
322: case 'x':
323: options.forward_x11 = 0;
324: break;
325: case 'X':
326: options.forward_x11 = 1;
327: break;
328: case 'g':
329: options.gateway_ports = 1;
330: break;
331: case 'P':
332: options.use_privileged_port = 0;
333: break;
334: case 'a':
335: options.forward_agent = 0;
1.53 markus 336: break;
337: case 'A':
338: options.forward_agent = 1;
1.31 markus 339: break;
1.9 dugsong 340: #ifdef AFS
1.31 markus 341: case 'k':
342: options.kerberos_tgt_passing = 0;
343: options.afs_token_passing = 0;
344: break;
1.1 deraadt 345: #endif
1.31 markus 346: case 'i':
347: if (stat(optarg, &st) < 0) {
1.128 fgsch 348: fprintf(stderr, "Warning: Identity file %s "
349: "does not exist.\n", optarg);
1.31 markus 350: break;
351: }
1.128 fgsch 352: if (options.num_identity_files >=
353: SSH_MAX_IDENTITY_FILES)
354: fatal("Too many identity files specified "
355: "(max %d)", SSH_MAX_IDENTITY_FILES);
356: options.identity_files[options.num_identity_files++] =
357: xstrdup(optarg);
1.31 markus 358: break;
1.127 markus 359: case 'I':
360: #ifdef SMARTCARD
1.133 markus 361: options.smartcard_device = xstrdup(optarg);
1.137 jakob 362: #else
1.127 markus 363: fprintf(stderr, "no support for smartcards.\n");
1.137 jakob 364: #endif
1.127 markus 365: break;
1.31 markus 366: case 't':
1.79 markus 367: if (tty_flag)
368: force_tty_flag = 1;
1.31 markus 369: tty_flag = 1;
370: break;
371: case 'v':
1.66 markus 372: if (0 == debug_flag) {
373: debug_flag = 1;
374: options.log_level = SYSLOG_LEVEL_DEBUG1;
375: } else if (options.log_level < SYSLOG_LEVEL_DEBUG3) {
376: options.log_level++;
377: break;
1.128 fgsch 378: } else
1.103 millert 379: fatal("Too high debugging level.");
1.66 markus 380: /* fallthrough */
1.31 markus 381: case 'V':
1.96 deraadt 382: fprintf(stderr,
383: "%s, SSH protocols %d.%d/%d.%d, OpenSSL 0x%8.8lx\n",
1.46 markus 384: SSH_VERSION,
385: PROTOCOL_MAJOR_1, PROTOCOL_MINOR_1,
1.96 deraadt 386: PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2,
387: SSLeay());
1.31 markus 388: if (opt == 'V')
389: exit(0);
390: break;
391: case 'q':
392: options.log_level = SYSLOG_LEVEL_QUIET;
393: break;
394: case 'e':
395: if (optarg[0] == '^' && optarg[2] == 0 &&
1.128 fgsch 396: (u_char) optarg[1] >= 64 &&
397: (u_char) optarg[1] < 128)
1.78 markus 398: options.escape_char = (u_char) optarg[1] & 31;
1.31 markus 399: else if (strlen(optarg) == 1)
1.78 markus 400: options.escape_char = (u_char) optarg[0];
1.31 markus 401: else if (strcmp(optarg, "none") == 0)
1.119 stevesk 402: options.escape_char = SSH_ESCAPECHAR_NONE;
1.31 markus 403: else {
1.128 fgsch 404: fprintf(stderr, "Bad escape character '%s'.\n",
405: optarg);
1.31 markus 406: exit(1);
407: }
408: break;
409: case 'c':
1.49 markus 410: if (ciphers_valid(optarg)) {
411: /* SSH2 only */
412: options.ciphers = xstrdup(optarg);
1.51 markus 413: options.cipher = SSH_CIPHER_ILLEGAL;
1.49 markus 414: } else {
415: /* SSH1 only */
1.74 markus 416: options.cipher = cipher_number(optarg);
417: if (options.cipher == -1) {
1.128 fgsch 418: fprintf(stderr,
419: "Unknown cipher type '%s'\n",
420: optarg);
1.49 markus 421: exit(1);
422: }
1.128 fgsch 423: if (options.cipher == SSH_CIPHER_3DES)
1.74 markus 424: options.ciphers = "3des-cbc";
1.128 fgsch 425: else if (options.cipher == SSH_CIPHER_BLOWFISH)
1.74 markus 426: options.ciphers = "blowfish-cbc";
1.128 fgsch 427: else
1.74 markus 428: options.ciphers = (char *)-1;
1.95 markus 429: }
430: break;
431: case 'm':
432: if (mac_valid(optarg))
433: options.macs = xstrdup(optarg);
434: else {
1.128 fgsch 435: fprintf(stderr, "Unknown mac type '%s'\n",
436: optarg);
1.95 markus 437: exit(1);
1.31 markus 438: }
439: break;
440: case 'p':
1.113 stevesk 441: options.port = a2port(optarg);
442: if (options.port == 0) {
1.109 markus 443: fprintf(stderr, "Bad port '%s'\n", optarg);
444: exit(1);
445: }
1.31 markus 446: break;
447: case 'l':
448: options.user = optarg;
449: break;
1.141 stevesk 450:
451: case 'L':
1.31 markus 452: case 'R':
1.141 stevesk 453: if (sscanf(optarg, "%5[0-9]:%255[^:]:%5[0-9]",
454: sfwd_port, buf, sfwd_host_port) != 3 &&
455: sscanf(optarg, "%5[0-9]/%255[^/]/%5[0-9]",
456: sfwd_port, buf, sfwd_host_port) != 3) {
1.128 fgsch 457: fprintf(stderr,
1.141 stevesk 458: "Bad forwarding specification '%s'\n",
1.128 fgsch 459: optarg);
1.31 markus 460: usage();
461: /* NOTREACHED */
462: }
1.141 stevesk 463: if ((fwd_port = a2port(sfwd_port)) == 0 ||
1.165 markus 464: (fwd_host_port = a2port(sfwd_host_port)) == 0) {
1.128 fgsch 465: fprintf(stderr,
1.141 stevesk 466: "Bad forwarding port(s) '%s'\n", optarg);
467: exit(1);
1.31 markus 468: }
1.141 stevesk 469: if (opt == 'L')
470: add_local_forward(&options, fwd_port, buf,
471: fwd_host_port);
472: else if (opt == 'R')
473: add_remote_forward(&options, fwd_port, buf,
1.151 deraadt 474: fwd_host_port);
1.31 markus 475: break;
1.108 markus 476:
477: case 'D':
1.113 stevesk 478: fwd_port = a2port(optarg);
479: if (fwd_port == 0) {
1.128 fgsch 480: fprintf(stderr, "Bad dynamic port '%s'\n",
481: optarg);
1.109 markus 482: exit(1);
483: }
1.108 markus 484: add_local_forward(&options, fwd_port, "socks4", 0);
485: break;
486:
1.31 markus 487: case 'C':
488: options.compression = 1;
489: break;
1.45 markus 490: case 'N':
491: no_shell_flag = 1;
492: no_tty_flag = 1;
493: break;
494: case 'T':
495: no_tty_flag = 1;
496: break;
1.31 markus 497: case 'o':
498: dummy = 1;
1.128 fgsch 499: if (process_config_line(&options, host ? host : "",
500: optarg, "command-line", 0, &dummy) != 0)
1.31 markus 501: exit(1);
502: break;
1.85 djm 503: case 's':
504: subsystem_flag = 1;
1.117 markus 505: break;
506: case 'b':
507: options.bind_address = optarg;
1.85 djm 508: break;
1.139 markus 509: case 'F':
510: config = optarg;
511: break;
1.31 markus 512: default:
513: usage();
1.1 deraadt 514: }
1.31 markus 515: }
516:
1.128 fgsch 517: ac -= optind;
518: av += optind;
519:
520: if (ac > 0 && !host && **av != '-') {
521: if (strchr(*av, '@')) {
522: p = xstrdup(*av);
523: cp = strchr(p, '@');
524: if (cp == NULL || cp == p)
525: usage();
526: options.user = p;
527: *cp = '\0';
528: host = ++cp;
529: } else
530: host = *av;
531: ac--, av++;
532: if (ac > 0) {
533: optind = 0;
534: optreset = 1;
535: goto again;
536: }
537: }
538:
1.31 markus 539: /* Check that we got a host name. */
540: if (!host)
541: usage();
542:
1.54 markus 543: SSLeay_add_all_algorithms();
1.72 markus 544: ERR_load_crypto_strings();
1.146 markus 545: channel_set_af(IPv4or6);
1.31 markus 546:
547: /* Initialize the command to execute on remote host. */
548: buffer_init(&command);
1.1 deraadt 549:
1.33 markus 550: /*
551: * Save the command to execute on the remote host in a buffer. There
552: * is no limit on the length of the command, except by the maximum
553: * packet size. Also sets the tty flag if there is no command.
554: */
1.128 fgsch 555: if (!ac) {
1.31 markus 556: /* No command specified - execute shell on a tty. */
557: tty_flag = 1;
1.85 djm 558: if (subsystem_flag) {
1.128 fgsch 559: fprintf(stderr,
560: "You must specify a subsystem to invoke.\n");
1.85 djm 561: usage();
562: }
1.31 markus 563: } else {
1.128 fgsch 564: /* A command has been specified. Store it into the buffer. */
565: for (i = 0; i < ac; i++) {
566: if (i)
1.31 markus 567: buffer_append(&command, " ", 1);
568: buffer_append(&command, av[i], strlen(av[i]));
569: }
570: }
571:
572: /* Cannot fork to background if no command. */
1.63 markus 573: if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag)
1.31 markus 574: fatal("Cannot fork into background without a command to execute.");
575:
576: /* Allocate a tty by default if no command specified. */
577: if (buffer_len(&command) == 0)
578: tty_flag = 1;
579:
1.75 markus 580: /* Force no tty*/
581: if (no_tty_flag)
582: tty_flag = 0;
1.31 markus 583: /* Do not allocate a tty if stdin is not a tty. */
1.79 markus 584: if (!isatty(fileno(stdin)) && !force_tty_flag) {
1.31 markus 585: if (tty_flag)
1.103 millert 586: log("Pseudo-terminal will not be allocated because stdin is not a terminal.");
1.31 markus 587: tty_flag = 0;
588: }
1.45 markus 589:
1.101 markus 590: /*
591: * Initialize "log" output. Since we are the client all output
592: * actually goes to stderr.
593: */
1.111 markus 594: log_init(av[0], options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level,
595: SYSLOG_FACILITY_USER, 1);
1.31 markus 596:
1.139 markus 597: /*
598: * Read per-user configuration file. Ignore the system wide config
599: * file if the user specifies a config file on the command line.
600: */
601: if (config != NULL) {
1.142 stevesk 602: if (!read_config_file(config, host, &options))
603: fatal("Can't open user config file %.100s: "
604: "%.100s", config, strerror(errno));
1.139 markus 605: } else {
606: snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir,
607: _PATH_SSH_USER_CONFFILE);
1.145 markus 608: (void)read_config_file(buf, host, &options);
1.139 markus 609:
1.145 markus 610: /* Read systemwide configuration file after use config. */
1.142 stevesk 611: (void)read_config_file(_PATH_HOST_CONFIG_FILE, host, &options);
1.139 markus 612: }
1.31 markus 613:
614: /* Fill configuration defaults. */
615: fill_default_options(&options);
616:
617: /* reinit */
1.101 markus 618: log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 1);
1.31 markus 619:
620: if (options.user == NULL)
621: options.user = xstrdup(pw->pw_name);
622:
623: if (options.hostname != NULL)
624: host = options.hostname;
625:
626: /* Disable rhosts authentication if not running as root. */
627: if (original_effective_uid != 0 || !options.use_privileged_port) {
1.77 markus 628: debug("Rhosts Authentication disabled, "
1.71 markus 629: "originating port will not be trusted.");
1.31 markus 630: options.rhosts_authentication = 0;
631: }
1.33 markus 632: /*
633: * If using rsh has been selected, exec it now (without trying
634: * anything else). Note that we must release privileges first.
635: */
1.31 markus 636: if (options.use_rsh) {
1.33 markus 637: /*
638: * Restore our superuser privileges. This must be done
639: * before permanently setting the uid.
640: */
1.31 markus 641: restore_uid();
642:
643: /* Switch to the original uid permanently. */
1.107 markus 644: permanently_set_uid(pw);
1.31 markus 645:
646: /* Execute rsh. */
647: rsh_connect(host, options.user, &command);
648: fatal("rsh_connect returned");
649: }
650: /* Restore our superuser privileges. */
651: restore_uid();
652:
1.77 markus 653: /* Open a connection to the remote host. */
1.31 markus 654:
1.147 markus 655: cerr = ssh_connect(host, &hostaddr, options.port, IPv4or6,
1.77 markus 656: options.connection_attempts,
657: original_effective_uid != 0 || !options.use_privileged_port,
1.107 markus 658: pw, options.proxy_command);
1.31 markus 659:
1.33 markus 660: /*
661: * If we successfully made the connection, load the host private key
662: * in case we will need it later for combined rsa-rhosts
663: * authentication. This must be done before releasing extra
664: * privileges, because the file is only readable by root.
665: */
1.112 markus 666: sensitive_data.nkeys = 0;
667: sensitive_data.keys = NULL;
1.130 markus 668: if (!cerr && (options.rhosts_rsa_authentication ||
1.112 markus 669: options.hostbased_authentication)) {
670: sensitive_data.nkeys = 3;
671: sensitive_data.keys = xmalloc(sensitive_data.nkeys*sizeof(Key));
672: sensitive_data.keys[0] = key_load_private_type(KEY_RSA1,
1.105 markus 673: _PATH_HOST_KEY_FILE, "", NULL);
1.112 markus 674: sensitive_data.keys[1] = key_load_private_type(KEY_DSA,
675: _PATH_HOST_DSA_KEY_FILE, "", NULL);
676: sensitive_data.keys[2] = key_load_private_type(KEY_RSA,
677: _PATH_HOST_RSA_KEY_FILE, "", NULL);
1.31 markus 678: }
1.33 markus 679: /*
680: * Get rid of any extra privileges that we may have. We will no
681: * longer need them. Also, extra privileges could make it very hard
682: * to read identity files and other non-world-readable files from the
683: * user's home directory if it happens to be on a NFS volume where
684: * root is mapped to nobody.
685: */
686:
687: /*
688: * Note that some legacy systems need to postpone the following call
689: * to permanently_set_uid() until the private hostkey is destroyed
690: * with RSA_free(). Otherwise the calling user could ptrace() the
691: * process, read the private hostkey and impersonate the host.
692: * OpenBSD does not allow ptracing of setuid processes.
693: */
1.107 markus 694: permanently_set_uid(pw);
1.31 markus 695:
1.33 markus 696: /*
697: * Now that we are back to our own permissions, create ~/.ssh
698: * directory if it doesn\'t already exist.
699: */
1.138 jakob 700: snprintf(buf, sizeof buf, "%.100s%s%.100s", pw->pw_dir, strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR);
1.31 markus 701: if (stat(buf, &st) < 0)
1.57 djm 702: if (mkdir(buf, 0700) < 0)
1.31 markus 703: error("Could not create directory '%.200s'.", buf);
704:
705: /* Check if the connection failed, and try "rsh" if appropriate. */
1.130 markus 706: if (cerr) {
707: if (!options.fallback_to_rsh)
708: exit(1);
1.31 markus 709: if (options.port != 0)
1.130 markus 710: log("Secure connection to %.100s on port %hu refused; "
711: "reverting to insecure method",
712: host, options.port);
1.31 markus 713: else
1.130 markus 714: log("Secure connection to %.100s refused; "
715: "reverting to insecure method.", host);
1.31 markus 716:
1.130 markus 717: rsh_connect(host, options.user, &command);
718: fatal("rsh_connect returned");
1.31 markus 719: }
1.104 markus 720: /* load options.identity_files */
721: load_public_identity_files();
722:
723: /* Expand ~ in known host file names. */
724: /* XXX mem-leaks: */
1.72 markus 725: options.system_hostfile =
726: tilde_expand_filename(options.system_hostfile, original_real_uid);
727: options.user_hostfile =
728: tilde_expand_filename(options.user_hostfile, original_real_uid);
729: options.system_hostfile2 =
730: tilde_expand_filename(options.system_hostfile2, original_real_uid);
731: options.user_hostfile2 =
732: tilde_expand_filename(options.user_hostfile2, original_real_uid);
1.149 markus 733:
734: signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
1.31 markus 735:
736: /* Log into the remote system. This never returns if the login fails. */
1.112 markus 737: ssh_login(sensitive_data.keys, sensitive_data.nkeys,
738: host, (struct sockaddr *)&hostaddr, pw);
1.31 markus 739:
1.112 markus 740: /* We no longer need the private host keys. Clear them now. */
741: if (sensitive_data.nkeys != 0) {
742: for (i = 0; i < sensitive_data.nkeys; i++) {
743: if (sensitive_data.keys[i] != NULL) {
744: /* Destroys contents safely */
745: debug3("clear hostkey %d", i);
746: key_free(sensitive_data.keys[i]);
747: sensitive_data.keys[i] = NULL;
748: }
749: }
750: xfree(sensitive_data.keys);
1.134 markus 751: }
752: for (i = 0; i < options.num_identity_files; i++) {
753: if (options.identity_files[i]) {
754: xfree(options.identity_files[i]);
755: options.identity_files[i] = NULL;
756: }
757: if (options.identity_keys[i]) {
758: key_free(options.identity_keys[i]);
759: options.identity_keys[i] = NULL;
760: }
1.112 markus 761: }
1.31 markus 762:
1.45 markus 763: exit_status = compat20 ? ssh_session2() : ssh_session();
764: packet_close();
765: return exit_status;
766: }
767:
1.126 itojun 768: static void
1.150 stevesk 769: x11_get_proto(char **_proto, char **_data)
1.50 markus 770: {
771: char line[512];
1.150 stevesk 772: static char proto[512], data[512];
1.50 markus 773: FILE *f;
774: int got_data = 0, i;
1.159 stevesk 775: char *display;
1.50 markus 776:
1.150 stevesk 777: *_proto = proto;
778: *_data = data;
779: proto[0] = data[0] = '\0';
1.159 stevesk 780: if (options.xauth_location && (display = getenv("DISPLAY"))) {
1.55 markus 781: /* Try to get Xauthority information for the display. */
1.159 stevesk 782: if (strncmp(display, "localhost:", 10) == 0)
783: /*
784: * Handle FamilyLocal case where $DISPLAY does
785: * not match an authorization entry. For this we
786: * just try "xauth list unix:displaynum.screennum".
787: * XXX: "localhost" match to determine FamilyLocal
788: * is not perfect.
789: */
790: snprintf(line, sizeof line, "%.100s list unix:%s 2>"
791: _PATH_DEVNULL, options.xauth_location, display+10);
792: else
793: snprintf(line, sizeof line, "%.100s list %.200s 2>"
794: _PATH_DEVNULL, options.xauth_location, display);
795: debug2("x11_get_proto %s", line);
1.55 markus 796: f = popen(line, "r");
797: if (f && fgets(line, sizeof(line), f) &&
1.150 stevesk 798: sscanf(line, "%*s %511s %511s", proto, data) == 2)
1.55 markus 799: got_data = 1;
800: if (f)
801: pclose(f);
802: }
1.50 markus 803: /*
804: * If we didn't get authentication data, just make up some
805: * data. The forwarding code will check the validity of the
806: * response anyway, and substitute this data. The X11
807: * server, however, will ignore this fake data and use
808: * whatever authentication mechanisms it was using otherwise
809: * for the local connection.
810: */
811: if (!got_data) {
812: u_int32_t rand = 0;
813:
1.150 stevesk 814: strlcpy(proto, "MIT-MAGIC-COOKIE-1", sizeof proto);
1.50 markus 815: for (i = 0; i < 16; i++) {
816: if (i % 4 == 0)
817: rand = arc4random();
1.150 stevesk 818: snprintf(data + 2 * i, sizeof data - 2 * i, "%02x", rand & 0xff);
1.50 markus 819: rand >>= 8;
820: }
821: }
822: }
823:
1.126 itojun 824: static void
1.70 markus 825: ssh_init_forwarding(void)
826: {
1.86 markus 827: int success = 0;
1.70 markus 828: int i;
1.86 markus 829:
1.70 markus 830: /* Initiate local TCP/IP port forwardings. */
831: for (i = 0; i < options.num_local_forwards; i++) {
832: debug("Connections to local port %d forwarded to remote address %.200s:%d",
833: options.local_forwards[i].port,
834: options.local_forwards[i].host,
835: options.local_forwards[i].host_port);
1.158 markus 836: success += channel_setup_local_fwd_listener(
1.70 markus 837: options.local_forwards[i].port,
838: options.local_forwards[i].host,
839: options.local_forwards[i].host_port,
840: options.gateway_ports);
841: }
1.86 markus 842: if (i > 0 && success == 0)
843: error("Could not request local forwarding.");
1.70 markus 844:
845: /* Initiate remote TCP/IP port forwardings. */
846: for (i = 0; i < options.num_remote_forwards; i++) {
847: debug("Connections to remote port %d forwarded to local address %.200s:%d",
848: options.remote_forwards[i].port,
849: options.remote_forwards[i].host,
850: options.remote_forwards[i].host_port);
851: channel_request_remote_forwarding(
852: options.remote_forwards[i].port,
853: options.remote_forwards[i].host,
854: options.remote_forwards[i].host_port);
855: }
856: }
857:
1.126 itojun 858: static void
1.70 markus 859: check_agent_present(void)
860: {
861: if (options.forward_agent) {
862: /* Clear agent forwarding if we don\'t have an agent. */
863: int authfd = ssh_get_authentication_socket();
864: if (authfd < 0)
865: options.forward_agent = 0;
866: else
867: ssh_close_authentication_socket(authfd);
868: }
869: }
870:
1.126 itojun 871: static int
1.45 markus 872: ssh_session(void)
873: {
874: int type;
875: int interactive = 0;
876: int have_tty = 0;
877: struct winsize ws;
878: char *cp;
879:
1.31 markus 880: /* Enable compression if requested. */
881: if (options.compression) {
882: debug("Requesting compression at level %d.", options.compression_level);
883:
884: if (options.compression_level < 1 || options.compression_level > 9)
885: fatal("Compression level must be from 1 (fast) to 9 (slow, best).");
886:
887: /* Send the request. */
888: packet_start(SSH_CMSG_REQUEST_COMPRESSION);
889: packet_put_int(options.compression_level);
890: packet_send();
891: packet_write_wait();
1.156 markus 892: type = packet_read();
1.31 markus 893: if (type == SSH_SMSG_SUCCESS)
894: packet_start_compression(options.compression_level);
895: else if (type == SSH_SMSG_FAILURE)
896: log("Warning: Remote host refused compression.");
897: else
898: packet_disconnect("Protocol error waiting for compression response.");
899: }
900: /* Allocate a pseudo tty if appropriate. */
901: if (tty_flag) {
902: debug("Requesting pty.");
903:
904: /* Start the packet. */
905: packet_start(SSH_CMSG_REQUEST_PTY);
906:
907: /* Store TERM in the packet. There is no limit on the
908: length of the string. */
909: cp = getenv("TERM");
910: if (!cp)
911: cp = "";
1.124 markus 912: packet_put_cstring(cp);
1.31 markus 913:
914: /* Store window size in the packet. */
915: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
916: memset(&ws, 0, sizeof(ws));
917: packet_put_int(ws.ws_row);
918: packet_put_int(ws.ws_col);
919: packet_put_int(ws.ws_xpixel);
920: packet_put_int(ws.ws_ypixel);
921:
922: /* Store tty modes in the packet. */
1.115 stevesk 923: tty_make_modes(fileno(stdin), NULL);
1.31 markus 924:
925: /* Send the packet, and wait for it to leave. */
926: packet_send();
927: packet_write_wait();
928:
929: /* Read response from the server. */
1.156 markus 930: type = packet_read();
1.43 markus 931: if (type == SSH_SMSG_SUCCESS) {
1.31 markus 932: interactive = 1;
1.45 markus 933: have_tty = 1;
1.43 markus 934: } else if (type == SSH_SMSG_FAILURE)
1.31 markus 935: log("Warning: Remote host failed or refused to allocate a pseudo tty.");
936: else
937: packet_disconnect("Protocol error waiting for pty request response.");
938: }
939: /* Request X11 forwarding if enabled and DISPLAY is set. */
940: if (options.forward_x11 && getenv("DISPLAY") != NULL) {
1.150 stevesk 941: char *proto, *data;
1.50 markus 942: /* Get reasonable local authentication information. */
1.150 stevesk 943: x11_get_proto(&proto, &data);
1.50 markus 944: /* Request forwarding with authentication spoofing. */
1.31 markus 945: debug("Requesting X11 forwarding with authentication spoofing.");
1.50 markus 946: x11_request_forwarding_with_spoofing(0, 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) {
1.31 markus 953: log("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)
972: log("Warning: Remote host denied authentication agent forwarding.");
973: }
974:
1.70 markus 975: /* Initiate port forwardings. */
976: ssh_init_forwarding();
1.34 markus 977:
978: /* If requested, let ssh continue in the background. */
1.48 markus 979: if (fork_after_authentication_flag)
1.34 markus 980: if (daemon(1, 1) < 0)
981: fatal("daemon() failed: %.200s", strerror(errno));
1.31 markus 982:
1.33 markus 983: /*
984: * If a command was specified on the command line, execute the
985: * command now. Otherwise request the server to start a shell.
986: */
1.31 markus 987: if (buffer_len(&command) > 0) {
988: int len = buffer_len(&command);
989: if (len > 900)
990: len = 900;
1.152 stevesk 991: debug("Sending command: %.*s", len, (u_char *)buffer_ptr(&command));
1.31 markus 992: packet_start(SSH_CMSG_EXEC_CMD);
993: packet_put_string(buffer_ptr(&command), buffer_len(&command));
994: packet_send();
995: packet_write_wait();
996: } else {
997: debug("Requesting shell.");
998: packet_start(SSH_CMSG_EXEC_SHELL);
999: packet_send();
1000: packet_write_wait();
1001: }
1002:
1003: /* Enter the interactive session. */
1.119 stevesk 1004: return client_loop(have_tty, tty_flag ?
1005: options.escape_char : SSH_ESCAPECHAR_NONE, 0);
1.45 markus 1006: }
1007:
1.126 itojun 1008: static void
1.157 markus 1009: client_subsystem_reply(int type, u_int32_t seq, void *ctxt)
1.89 markus 1010: {
1011: int id, len;
1012:
1013: id = packet_get_int();
1014: len = buffer_len(&command);
1.100 markus 1015: if (len > 900)
1016: len = 900;
1.155 markus 1017: packet_check_eom();
1.89 markus 1018: if (type == SSH2_MSG_CHANNEL_FAILURE)
1019: fatal("Request for subsystem '%.*s' failed on channel %d",
1.152 stevesk 1020: len, (u_char *)buffer_ptr(&command), id);
1.89 markus 1021: }
1022:
1.143 markus 1023: /* request pty/x11/agent/tcpfwd/shell for channel */
1.126 itojun 1024: static void
1.143 markus 1025: ssh_session2_setup(int id, void *arg)
1.45 markus 1026: {
1027: int len;
1.80 markus 1028: int interactive = 0;
1.115 stevesk 1029: struct termios tio;
1.80 markus 1030:
1.143 markus 1031: debug("ssh_session2_setup: id %d", id);
1.31 markus 1032:
1.45 markus 1033: if (tty_flag) {
1034: struct winsize ws;
1035: char *cp;
1036: cp = getenv("TERM");
1037: if (!cp)
1038: cp = "";
1039: /* Store window size in the packet. */
1040: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
1041: memset(&ws, 0, sizeof(ws));
1042:
1043: channel_request_start(id, "pty-req", 0);
1044: packet_put_cstring(cp);
1045: packet_put_int(ws.ws_col);
1046: packet_put_int(ws.ws_row);
1047: packet_put_int(ws.ws_xpixel);
1048: packet_put_int(ws.ws_ypixel);
1.115 stevesk 1049: tio = get_saved_tio();
1050: tty_make_modes(/*ignored*/ 0, &tio);
1.45 markus 1051: packet_send();
1.80 markus 1052: interactive = 1;
1.45 markus 1053: /* XXX wait for reply */
1054: }
1.50 markus 1055: if (options.forward_x11 &&
1056: getenv("DISPLAY") != NULL) {
1.150 stevesk 1057: char *proto, *data;
1.50 markus 1058: /* Get reasonable local authentication information. */
1.150 stevesk 1059: x11_get_proto(&proto, &data);
1.50 markus 1060: /* Request forwarding with authentication spoofing. */
1061: debug("Requesting X11 forwarding with authentication spoofing.");
1062: x11_request_forwarding_with_spoofing(id, proto, data);
1.80 markus 1063: interactive = 1;
1.50 markus 1064: /* XXX wait for reply */
1065: }
1066:
1.70 markus 1067: check_agent_present();
1068: if (options.forward_agent) {
1069: debug("Requesting authentication agent forwarding.");
1070: channel_request_start(id, "auth-agent-req@openssh.com", 0);
1071: packet_send();
1072: }
1073:
1.45 markus 1074: len = buffer_len(&command);
1075: if (len > 0) {
1076: if (len > 900)
1077: len = 900;
1.85 djm 1078: if (subsystem_flag) {
1.152 stevesk 1079: debug("Sending subsystem: %.*s", len, (u_char *)buffer_ptr(&command));
1.89 markus 1080: channel_request_start(id, "subsystem", /*want reply*/ 1);
1081: /* register callback for reply */
1082: /* XXX we asume that client_loop has already been called */
1083: dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &client_subsystem_reply);
1084: dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &client_subsystem_reply);
1.85 djm 1085: } else {
1.152 stevesk 1086: debug("Sending command: %.*s", len, (u_char *)buffer_ptr(&command));
1.85 djm 1087: channel_request_start(id, "exec", 0);
1088: }
1.100 markus 1089: packet_put_string(buffer_ptr(&command), buffer_len(&command));
1.45 markus 1090: packet_send();
1091: } else {
1.161 markus 1092: channel_request_start(id, "shell", 0);
1093: packet_send();
1.45 markus 1094: }
1.90 markus 1095:
1.80 markus 1096: packet_set_interactive(interactive);
1.45 markus 1097: }
1098:
1.143 markus 1099: /* open new channel for a session */
1.126 itojun 1100: static int
1.143 markus 1101: ssh_session2_open(void)
1.45 markus 1102: {
1.118 markus 1103: Channel *c;
1104: int window, packetmax, in, out, err;
1.60 markus 1105:
1.62 markus 1106: if (stdin_null_flag) {
1.93 itojun 1107: in = open(_PATH_DEVNULL, O_RDONLY);
1.62 markus 1108: } else {
1109: in = dup(STDIN_FILENO);
1110: }
1.60 markus 1111: out = dup(STDOUT_FILENO);
1112: err = dup(STDERR_FILENO);
1.45 markus 1113:
1114: if (in < 0 || out < 0 || err < 0)
1.62 markus 1115: fatal("dup() in/out/err failed");
1.45 markus 1116:
1.69 markus 1117: /* enable nonblocking unless tty */
1118: if (!isatty(in))
1119: set_nonblock(in);
1120: if (!isatty(out))
1121: set_nonblock(out);
1122: if (!isatty(err))
1123: set_nonblock(err);
1124:
1.65 markus 1125: window = CHAN_SES_WINDOW_DEFAULT;
1126: packetmax = CHAN_SES_PACKET_DEFAULT;
1.164 markus 1127: if (tty_flag) {
1128: window >>= 1;
1129: packetmax >>= 1;
1.45 markus 1130: }
1.118 markus 1131: c = channel_new(
1.45 markus 1132: "session", SSH_CHANNEL_OPENING, in, out, err,
1.65 markus 1133: window, packetmax, CHAN_EXTENDED_WRITE,
1.69 markus 1134: xstrdup("client-session"), /*nonblock*/0);
1.45 markus 1135:
1.143 markus 1136: debug3("ssh_session2_open: channel_new: %d", c->self);
1.106 markus 1137:
1.122 markus 1138: channel_send_open(c->self);
1.143 markus 1139: if (!no_shell_flag)
1.160 markus 1140: channel_register_confirm(c->self, ssh_session2_setup);
1.106 markus 1141:
1.118 markus 1142: return c->self;
1.106 markus 1143: }
1144:
1.126 itojun 1145: static int
1.106 markus 1146: ssh_session2(void)
1147: {
1.143 markus 1148: int id = -1;
1.106 markus 1149:
1150: /* XXX should be pre-session */
1151: ssh_init_forwarding();
1152:
1.143 markus 1153: if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN))
1154: id = ssh_session2_open();
1.106 markus 1155:
1156: /* If requested, let ssh continue in the background. */
1157: if (fork_after_authentication_flag)
1158: if (daemon(1, 1) < 0)
1159: fatal("daemon() failed: %.200s", strerror(errno));
1.31 markus 1160:
1.119 stevesk 1161: return client_loop(tty_flag, tty_flag ?
1162: options.escape_char : SSH_ESCAPECHAR_NONE, id);
1.72 markus 1163: }
1164:
1.126 itojun 1165: static void
1.104 markus 1166: load_public_identity_files(void)
1167: {
1168: char *filename;
1.167 markus 1169: int i = 0;
1.104 markus 1170: Key *public;
1.167 markus 1171: #ifdef SMARTCARD
1172: Key **keys;
1.104 markus 1173:
1.133 markus 1174: if (options.smartcard_device != NULL &&
1.167 markus 1175: options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
1176: (keys = sc_get_keys(options.smartcard_device, NULL)) != NULL ) {
1177: int count = 0;
1178: for (i = 0; keys[i] != NULL; i++) {
1179: count++;
1180: memmove(&options.identity_files[1], &options.identity_files[0],
1181: sizeof(char *) * (SSH_MAX_IDENTITY_FILES - 1));
1182: memmove(&options.identity_keys[1], &options.identity_keys[0],
1183: sizeof(Key *) * (SSH_MAX_IDENTITY_FILES - 1));
1184: options.num_identity_files++;
1185: options.identity_keys[0] = keys[i];
1186: options.identity_files[0] = xstrdup("smartcard key");;
1187: }
1.168 ! markus 1188: if (options.num_identity_files > SSH_MAX_IDENTITY_FILES)
! 1189: options.num_identity_files = SSH_MAX_IDENTITY_FILES;
1.167 markus 1190: i = count;
1191: xfree(keys);
1.127 markus 1192: }
1.136 jakob 1193: #endif /* SMARTCARD */
1.131 millert 1194: for (; i < options.num_identity_files; i++) {
1195: filename = tilde_expand_filename(options.identity_files[i],
1196: original_real_uid);
1197: public = key_load_public(filename, NULL);
1198: debug("identity file %s type %d", filename,
1199: public ? public->type : -1);
1200: xfree(options.identity_files[i]);
1201: options.identity_files[i] = filename;
1202: options.identity_keys[i] = public;
1203: }
1.1 deraadt 1204: }
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