Annotation of src/usr.bin/ssh/ssh.c, Revision 1.204
1.1 deraadt 1: /*
1.32 deraadt 2: * Author: Tatu Ylonen <ylo@cs.hut.fi>
3: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
4: * All rights reserved
5: * Ssh client program. This program can be used to log into a remote machine.
6: * The software supports strong authentication, encryption, and forwarding
7: * of X11, TCP/IP, and authentication connections.
8: *
1.64 deraadt 9: * As far as I am concerned, the code I have written for this software
10: * can be used freely for any purpose. Any derived versions of this
11: * software must be clearly marked as such, and if the derived work is
12: * incompatible with the protocol description in the RFC file, it must be
13: * called by a name other than "ssh" or "Secure Shell".
14: *
15: * Copyright (c) 1999 Niels Provos. All rights reserved.
1.202 markus 16: * Copyright (c) 2000, 2001, 2002, 2003 Markus Friedl. All rights reserved.
1.64 deraadt 17: *
18: * Modified to work with SSL by Niels Provos <provos@citi.umich.edu>
19: * in Canada (German citizen).
20: *
21: * Redistribution and use in source and binary forms, with or without
22: * modification, are permitted provided that the following conditions
23: * are met:
24: * 1. Redistributions of source code must retain the above copyright
25: * notice, this list of conditions and the following disclaimer.
26: * 2. Redistributions in binary form must reproduce the above copyright
27: * notice, this list of conditions and the following disclaimer in the
28: * documentation and/or other materials provided with the distribution.
29: *
30: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
31: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
32: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
33: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
34: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
35: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
36: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
37: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
38: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
39: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.32 deraadt 40: */
1.1 deraadt 41:
42: #include "includes.h"
1.204 ! dtucker 43: RCSID("$OpenBSD: ssh.c,v 1.203 2003/11/21 11:57:03 djm Exp $");
1.49 markus 44:
45: #include <openssl/evp.h>
1.72 markus 46: #include <openssl/err.h>
1.1 deraadt 47:
1.84 markus 48: #include "ssh.h"
49: #include "ssh1.h"
50: #include "ssh2.h"
51: #include "compat.h"
52: #include "cipher.h"
1.1 deraadt 53: #include "xmalloc.h"
54: #include "packet.h"
55: #include "buffer.h"
1.123 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");
1.88 stevesk 153: fprintf(stderr, " -X Enable X11 connection forwarding.\n");
1.202 markus 154: fprintf(stderr, " -Y Enable trusted 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,
1.202 markus 259: "1246ab:c:e:fgi:kl:m:no:p:qstvxACD:F:I:L:NPR:TVXY")) != -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;
1.202 markus 286: case 'Y':
287: options.forward_x11 = 1;
288: options.forward_x11_trusted = 1;
289: break;
1.31 markus 290: case 'g':
291: options.gateway_ports = 1;
292: break;
1.183 stevesk 293: case 'P': /* deprecated */
1.31 markus 294: options.use_privileged_port = 0;
295: break;
296: case 'a':
297: options.forward_agent = 0;
1.53 markus 298: break;
299: case 'A':
300: options.forward_agent = 1;
1.31 markus 301: break;
302: case 'k':
1.204 ! dtucker 303: options.gss_deleg_creds = 0;
1.31 markus 304: break;
305: case 'i':
306: if (stat(optarg, &st) < 0) {
1.128 fgsch 307: fprintf(stderr, "Warning: Identity file %s "
308: "does not exist.\n", optarg);
1.31 markus 309: break;
310: }
1.128 fgsch 311: if (options.num_identity_files >=
312: SSH_MAX_IDENTITY_FILES)
313: fatal("Too many identity files specified "
314: "(max %d)", SSH_MAX_IDENTITY_FILES);
315: options.identity_files[options.num_identity_files++] =
316: xstrdup(optarg);
1.31 markus 317: break;
1.127 markus 318: case 'I':
319: #ifdef SMARTCARD
1.133 markus 320: options.smartcard_device = xstrdup(optarg);
1.137 jakob 321: #else
1.127 markus 322: fprintf(stderr, "no support for smartcards.\n");
1.137 jakob 323: #endif
1.127 markus 324: break;
1.31 markus 325: case 't':
1.79 markus 326: if (tty_flag)
327: force_tty_flag = 1;
1.31 markus 328: tty_flag = 1;
329: break;
330: case 'v':
1.197 markus 331: if (debug_flag == 0) {
1.66 markus 332: debug_flag = 1;
333: options.log_level = SYSLOG_LEVEL_DEBUG1;
1.197 markus 334: } else {
335: if (options.log_level < SYSLOG_LEVEL_DEBUG3)
336: options.log_level++;
1.66 markus 337: break;
1.197 markus 338: }
1.66 markus 339: /* fallthrough */
1.31 markus 340: case 'V':
1.96 deraadt 341: fprintf(stderr,
1.193 djm 342: "%s, SSH protocols %d.%d/%d.%d, %s\n",
1.46 markus 343: SSH_VERSION,
344: PROTOCOL_MAJOR_1, PROTOCOL_MINOR_1,
1.96 deraadt 345: PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2,
1.193 djm 346: SSLeay_version(SSLEAY_VERSION));
1.31 markus 347: if (opt == 'V')
348: exit(0);
349: break;
350: case 'q':
351: options.log_level = SYSLOG_LEVEL_QUIET;
352: break;
353: case 'e':
354: if (optarg[0] == '^' && optarg[2] == 0 &&
1.128 fgsch 355: (u_char) optarg[1] >= 64 &&
356: (u_char) optarg[1] < 128)
1.78 markus 357: options.escape_char = (u_char) optarg[1] & 31;
1.31 markus 358: else if (strlen(optarg) == 1)
1.78 markus 359: options.escape_char = (u_char) optarg[0];
1.31 markus 360: else if (strcmp(optarg, "none") == 0)
1.119 stevesk 361: options.escape_char = SSH_ESCAPECHAR_NONE;
1.31 markus 362: else {
1.128 fgsch 363: fprintf(stderr, "Bad escape character '%s'.\n",
364: optarg);
1.31 markus 365: exit(1);
366: }
367: break;
368: case 'c':
1.49 markus 369: if (ciphers_valid(optarg)) {
370: /* SSH2 only */
371: options.ciphers = xstrdup(optarg);
1.51 markus 372: options.cipher = SSH_CIPHER_ILLEGAL;
1.49 markus 373: } else {
374: /* SSH1 only */
1.74 markus 375: options.cipher = cipher_number(optarg);
376: if (options.cipher == -1) {
1.128 fgsch 377: fprintf(stderr,
378: "Unknown cipher type '%s'\n",
379: optarg);
1.49 markus 380: exit(1);
381: }
1.128 fgsch 382: if (options.cipher == SSH_CIPHER_3DES)
1.74 markus 383: options.ciphers = "3des-cbc";
1.128 fgsch 384: else if (options.cipher == SSH_CIPHER_BLOWFISH)
1.74 markus 385: options.ciphers = "blowfish-cbc";
1.128 fgsch 386: else
1.74 markus 387: options.ciphers = (char *)-1;
1.95 markus 388: }
389: break;
390: case 'm':
391: if (mac_valid(optarg))
392: options.macs = xstrdup(optarg);
393: else {
1.128 fgsch 394: fprintf(stderr, "Unknown mac type '%s'\n",
395: optarg);
1.95 markus 396: exit(1);
1.31 markus 397: }
398: break;
399: case 'p':
1.113 stevesk 400: options.port = a2port(optarg);
401: if (options.port == 0) {
1.109 markus 402: fprintf(stderr, "Bad port '%s'\n", optarg);
403: exit(1);
404: }
1.31 markus 405: break;
406: case 'l':
407: options.user = optarg;
408: break;
1.141 stevesk 409:
410: case 'L':
1.31 markus 411: case 'R':
1.141 stevesk 412: if (sscanf(optarg, "%5[0-9]:%255[^:]:%5[0-9]",
413: sfwd_port, buf, sfwd_host_port) != 3 &&
414: sscanf(optarg, "%5[0-9]/%255[^/]/%5[0-9]",
415: sfwd_port, buf, sfwd_host_port) != 3) {
1.128 fgsch 416: fprintf(stderr,
1.141 stevesk 417: "Bad forwarding specification '%s'\n",
1.128 fgsch 418: optarg);
1.31 markus 419: usage();
420: /* NOTREACHED */
421: }
1.141 stevesk 422: if ((fwd_port = a2port(sfwd_port)) == 0 ||
1.165 markus 423: (fwd_host_port = a2port(sfwd_host_port)) == 0) {
1.128 fgsch 424: fprintf(stderr,
1.141 stevesk 425: "Bad forwarding port(s) '%s'\n", optarg);
426: exit(1);
1.31 markus 427: }
1.141 stevesk 428: if (opt == 'L')
429: add_local_forward(&options, fwd_port, buf,
430: fwd_host_port);
431: else if (opt == 'R')
432: add_remote_forward(&options, fwd_port, buf,
1.151 deraadt 433: fwd_host_port);
1.31 markus 434: break;
1.108 markus 435:
436: case 'D':
1.113 stevesk 437: fwd_port = a2port(optarg);
438: if (fwd_port == 0) {
1.128 fgsch 439: fprintf(stderr, "Bad dynamic port '%s'\n",
440: optarg);
1.109 markus 441: exit(1);
442: }
1.200 markus 443: add_local_forward(&options, fwd_port, "socks", 0);
1.108 markus 444: break;
445:
1.31 markus 446: case 'C':
447: options.compression = 1;
448: break;
1.45 markus 449: case 'N':
450: no_shell_flag = 1;
451: no_tty_flag = 1;
452: break;
453: case 'T':
454: no_tty_flag = 1;
455: break;
1.31 markus 456: case 'o':
457: dummy = 1;
1.128 fgsch 458: if (process_config_line(&options, host ? host : "",
459: optarg, "command-line", 0, &dummy) != 0)
1.31 markus 460: exit(1);
461: break;
1.85 djm 462: case 's':
463: subsystem_flag = 1;
1.117 markus 464: break;
465: case 'b':
466: options.bind_address = optarg;
1.85 djm 467: break;
1.139 markus 468: case 'F':
469: config = optarg;
470: break;
1.31 markus 471: default:
472: usage();
1.1 deraadt 473: }
1.31 markus 474: }
475:
1.128 fgsch 476: ac -= optind;
477: av += optind;
478:
479: if (ac > 0 && !host && **av != '-') {
1.188 markus 480: if (strrchr(*av, '@')) {
1.128 fgsch 481: p = xstrdup(*av);
1.188 markus 482: cp = strrchr(p, '@');
1.128 fgsch 483: if (cp == NULL || cp == p)
484: usage();
485: options.user = p;
486: *cp = '\0';
487: host = ++cp;
488: } else
489: host = *av;
1.189 millert 490: if (ac > 1) {
491: optind = optreset = 1;
1.128 fgsch 492: goto again;
493: }
1.189 millert 494: ac--, av++;
1.128 fgsch 495: }
496:
1.31 markus 497: /* Check that we got a host name. */
498: if (!host)
499: usage();
500:
1.54 markus 501: SSLeay_add_all_algorithms();
1.72 markus 502: ERR_load_crypto_strings();
1.31 markus 503:
504: /* Initialize the command to execute on remote host. */
505: buffer_init(&command);
1.1 deraadt 506:
1.33 markus 507: /*
508: * Save the command to execute on the remote host in a buffer. There
509: * is no limit on the length of the command, except by the maximum
510: * packet size. Also sets the tty flag if there is no command.
511: */
1.128 fgsch 512: if (!ac) {
1.31 markus 513: /* No command specified - execute shell on a tty. */
514: tty_flag = 1;
1.85 djm 515: if (subsystem_flag) {
1.128 fgsch 516: fprintf(stderr,
517: "You must specify a subsystem to invoke.\n");
1.85 djm 518: usage();
519: }
1.31 markus 520: } else {
1.128 fgsch 521: /* A command has been specified. Store it into the buffer. */
522: for (i = 0; i < ac; i++) {
523: if (i)
1.31 markus 524: buffer_append(&command, " ", 1);
525: buffer_append(&command, av[i], strlen(av[i]));
526: }
527: }
528:
529: /* Cannot fork to background if no command. */
1.63 markus 530: if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag)
1.31 markus 531: fatal("Cannot fork into background without a command to execute.");
532:
533: /* Allocate a tty by default if no command specified. */
534: if (buffer_len(&command) == 0)
535: tty_flag = 1;
536:
1.180 deraadt 537: /* Force no tty */
1.75 markus 538: if (no_tty_flag)
539: tty_flag = 0;
1.31 markus 540: /* Do not allocate a tty if stdin is not a tty. */
1.79 markus 541: if (!isatty(fileno(stdin)) && !force_tty_flag) {
1.31 markus 542: if (tty_flag)
1.191 itojun 543: logit("Pseudo-terminal will not be allocated because stdin is not a terminal.");
1.31 markus 544: tty_flag = 0;
545: }
1.45 markus 546:
1.101 markus 547: /*
548: * Initialize "log" output. Since we are the client all output
549: * actually goes to stderr.
550: */
1.111 markus 551: log_init(av[0], options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level,
552: SYSLOG_FACILITY_USER, 1);
1.31 markus 553:
1.139 markus 554: /*
555: * Read per-user configuration file. Ignore the system wide config
556: * file if the user specifies a config file on the command line.
557: */
558: if (config != NULL) {
1.142 stevesk 559: if (!read_config_file(config, host, &options))
560: fatal("Can't open user config file %.100s: "
561: "%.100s", config, strerror(errno));
1.139 markus 562: } else {
563: snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir,
564: _PATH_SSH_USER_CONFFILE);
1.145 markus 565: (void)read_config_file(buf, host, &options);
1.139 markus 566:
1.145 markus 567: /* Read systemwide configuration file after use config. */
1.142 stevesk 568: (void)read_config_file(_PATH_HOST_CONFIG_FILE, host, &options);
1.139 markus 569: }
1.31 markus 570:
571: /* Fill configuration defaults. */
572: fill_default_options(&options);
573:
1.196 djm 574: channel_set_af(options.address_family);
575:
1.31 markus 576: /* reinit */
1.101 markus 577: log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 1);
1.31 markus 578:
579: if (options.user == NULL)
580: options.user = xstrdup(pw->pw_name);
581:
582: if (options.hostname != NULL)
583: host = options.hostname;
1.195 markus 584:
585: /* force lowercase for hostkey matching */
586: if (options.host_key_alias != NULL) {
587: for (p = options.host_key_alias; *p; p++)
588: if (isupper(*p))
589: *p = tolower(*p);
590: }
1.190 markus 591:
592: if (options.proxy_command != NULL &&
593: strcmp(options.proxy_command, "none") == 0)
594: options.proxy_command = NULL;
1.31 markus 595:
1.77 markus 596: /* Open a connection to the remote host. */
1.203 djm 597: if (ssh_connect(host, &hostaddr, options.port,
1.196 djm 598: options.address_family, options.connection_attempts,
1.177 markus 599: original_effective_uid == 0 && options.use_privileged_port,
1.179 markus 600: options.proxy_command) != 0)
1.178 markus 601: exit(1);
1.31 markus 602:
1.33 markus 603: /*
604: * If we successfully made the connection, load the host private key
605: * in case we will need it later for combined rsa-rhosts
606: * authentication. This must be done before releasing extra
607: * privileges, because the file is only readable by root.
1.174 markus 608: * If we cannot access the private keys, load the public keys
609: * instead and try to execute the ssh-keysign helper instead.
1.33 markus 610: */
1.112 markus 611: sensitive_data.nkeys = 0;
612: sensitive_data.keys = NULL;
1.173 markus 613: sensitive_data.external_keysign = 0;
1.178 markus 614: if (options.rhosts_rsa_authentication ||
615: options.hostbased_authentication) {
1.112 markus 616: sensitive_data.nkeys = 3;
1.180 deraadt 617: sensitive_data.keys = xmalloc(sensitive_data.nkeys *
618: sizeof(Key));
1.177 markus 619:
620: PRIV_START;
1.112 markus 621: sensitive_data.keys[0] = key_load_private_type(KEY_RSA1,
1.105 markus 622: _PATH_HOST_KEY_FILE, "", NULL);
1.112 markus 623: sensitive_data.keys[1] = key_load_private_type(KEY_DSA,
624: _PATH_HOST_DSA_KEY_FILE, "", NULL);
625: sensitive_data.keys[2] = key_load_private_type(KEY_RSA,
626: _PATH_HOST_RSA_KEY_FILE, "", NULL);
1.177 markus 627: PRIV_END;
1.173 markus 628:
1.181 markus 629: if (options.hostbased_authentication == 1 &&
630: sensitive_data.keys[0] == NULL &&
1.173 markus 631: sensitive_data.keys[1] == NULL &&
632: sensitive_data.keys[2] == NULL) {
633: sensitive_data.keys[1] = key_load_public(
634: _PATH_HOST_DSA_KEY_FILE, NULL);
635: sensitive_data.keys[2] = key_load_public(
636: _PATH_HOST_RSA_KEY_FILE, NULL);
637: sensitive_data.external_keysign = 1;
638: }
1.31 markus 639: }
1.33 markus 640: /*
641: * Get rid of any extra privileges that we may have. We will no
642: * longer need them. Also, extra privileges could make it very hard
643: * to read identity files and other non-world-readable files from the
644: * user's home directory if it happens to be on a NFS volume where
645: * root is mapped to nobody.
646: */
1.177 markus 647: seteuid(original_real_uid);
648: setuid(original_real_uid);
1.31 markus 649:
1.33 markus 650: /*
651: * Now that we are back to our own permissions, create ~/.ssh
652: * directory if it doesn\'t already exist.
653: */
1.138 jakob 654: snprintf(buf, sizeof buf, "%.100s%s%.100s", pw->pw_dir, strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR);
1.31 markus 655: if (stat(buf, &st) < 0)
1.57 djm 656: if (mkdir(buf, 0700) < 0)
1.31 markus 657: error("Could not create directory '%.200s'.", buf);
658:
1.104 markus 659: /* load options.identity_files */
660: load_public_identity_files();
661:
662: /* Expand ~ in known host file names. */
663: /* XXX mem-leaks: */
1.72 markus 664: options.system_hostfile =
665: tilde_expand_filename(options.system_hostfile, original_real_uid);
666: options.user_hostfile =
667: tilde_expand_filename(options.user_hostfile, original_real_uid);
668: options.system_hostfile2 =
669: tilde_expand_filename(options.system_hostfile2, original_real_uid);
670: options.user_hostfile2 =
671: tilde_expand_filename(options.user_hostfile2, original_real_uid);
1.149 markus 672:
673: signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
1.31 markus 674:
675: /* Log into the remote system. This never returns if the login fails. */
1.173 markus 676: ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr, pw);
1.31 markus 677:
1.112 markus 678: /* We no longer need the private host keys. Clear them now. */
679: if (sensitive_data.nkeys != 0) {
680: for (i = 0; i < sensitive_data.nkeys; i++) {
681: if (sensitive_data.keys[i] != NULL) {
682: /* Destroys contents safely */
683: debug3("clear hostkey %d", i);
684: key_free(sensitive_data.keys[i]);
685: sensitive_data.keys[i] = NULL;
686: }
687: }
688: xfree(sensitive_data.keys);
1.134 markus 689: }
690: for (i = 0; i < options.num_identity_files; i++) {
691: if (options.identity_files[i]) {
692: xfree(options.identity_files[i]);
693: options.identity_files[i] = NULL;
694: }
695: if (options.identity_keys[i]) {
696: key_free(options.identity_keys[i]);
697: options.identity_keys[i] = NULL;
698: }
1.112 markus 699: }
1.31 markus 700:
1.45 markus 701: exit_status = compat20 ? ssh_session2() : ssh_session();
702: packet_close();
1.186 djm 703:
704: /*
1.203 djm 705: * Send SIGHUP to proxy command if used. We don't wait() in
1.186 djm 706: * case it hangs and instead rely on init to reap the child
707: */
708: if (proxy_command_pid > 1)
709: kill(proxy_command_pid, SIGHUP);
710:
1.45 markus 711: return exit_status;
712: }
713:
1.202 markus 714: #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
715:
1.126 itojun 716: static void
1.150 stevesk 717: x11_get_proto(char **_proto, char **_data)
1.50 markus 718: {
1.202 markus 719: char cmd[1024];
1.50 markus 720: char line[512];
1.202 markus 721: char xdisplay[512];
1.150 stevesk 722: static char proto[512], data[512];
1.50 markus 723: FILE *f;
1.202 markus 724: int got_data = 0, generated = 0, do_unlink = 0, i;
725: char *display, *xauthdir, *xauthfile;
1.182 stevesk 726: struct stat st;
1.50 markus 727:
1.202 markus 728: xauthdir = xauthfile = NULL;
1.150 stevesk 729: *_proto = proto;
730: *_data = data;
731: proto[0] = data[0] = '\0';
1.202 markus 732:
1.182 stevesk 733: if (!options.xauth_location ||
734: (stat(options.xauth_location, &st) == -1)) {
735: debug("No xauth program.");
736: } else {
737: if ((display = getenv("DISPLAY")) == NULL) {
738: debug("x11_get_proto: DISPLAY not set");
739: return;
740: }
1.202 markus 741: /*
742: * Handle FamilyLocal case where $DISPLAY does
743: * not match an authorization entry. For this we
744: * just try "xauth list unix:displaynum.screennum".
745: * XXX: "localhost" match to determine FamilyLocal
746: * is not perfect.
747: */
748: if (strncmp(display, "localhost:", 10) == 0) {
749: snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
750: display + 10);
751: display = xdisplay;
752: }
753: if (options.forward_x11_trusted == 0) {
754: xauthdir = xmalloc(MAXPATHLEN);
755: xauthfile = xmalloc(MAXPATHLEN);
756: strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN);
757: if (mkdtemp(xauthdir) != NULL) {
758: do_unlink = 1;
759: snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile",
760: xauthdir);
761: snprintf(cmd, sizeof(cmd),
762: "%s -f %s generate %s " SSH_X11_PROTO
763: " untrusted timeout 120 2>" _PATH_DEVNULL,
764: options.xauth_location, xauthfile, display);
765: debug2("x11_get_proto: %s", cmd);
766: if (system(cmd) == 0)
767: generated = 1;
768: }
769: }
770: snprintf(cmd, sizeof(cmd),
771: "%s %s%s list %s . 2>" _PATH_DEVNULL,
772: options.xauth_location,
773: generated ? "-f " : "" ,
774: generated ? xauthfile : "",
775: display);
776: debug2("x11_get_proto: %s", cmd);
777: f = popen(cmd, "r");
1.55 markus 778: if (f && fgets(line, sizeof(line), f) &&
1.150 stevesk 779: sscanf(line, "%*s %511s %511s", proto, data) == 2)
1.55 markus 780: got_data = 1;
781: if (f)
782: pclose(f);
783: }
1.202 markus 784:
785: if (do_unlink) {
786: unlink(xauthfile);
787: rmdir(xauthdir);
788: }
789: if (xauthdir)
790: xfree(xauthdir);
791: if (xauthfile)
792: xfree(xauthfile);
793:
1.50 markus 794: /*
795: * If we didn't get authentication data, just make up some
796: * data. The forwarding code will check the validity of the
797: * response anyway, and substitute this data. The X11
798: * server, however, will ignore this fake data and use
799: * whatever authentication mechanisms it was using otherwise
800: * for the local connection.
801: */
802: if (!got_data) {
803: u_int32_t rand = 0;
804:
1.202 markus 805: logit("Warning: No xauth data; "
806: "using fake authentication data for X11 forwarding.");
807: strlcpy(proto, SSH_X11_PROTO, sizeof proto);
1.50 markus 808: for (i = 0; i < 16; i++) {
809: if (i % 4 == 0)
810: rand = arc4random();
1.202 markus 811: snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
812: rand & 0xff);
1.50 markus 813: rand >>= 8;
814: }
815: }
816: }
817:
1.126 itojun 818: static void
1.70 markus 819: ssh_init_forwarding(void)
820: {
1.86 markus 821: int success = 0;
1.70 markus 822: int i;
1.86 markus 823:
1.70 markus 824: /* Initiate local TCP/IP port forwardings. */
825: for (i = 0; i < options.num_local_forwards; i++) {
826: debug("Connections to local port %d forwarded to remote address %.200s:%d",
827: options.local_forwards[i].port,
828: options.local_forwards[i].host,
829: options.local_forwards[i].host_port);
1.158 markus 830: success += channel_setup_local_fwd_listener(
1.70 markus 831: options.local_forwards[i].port,
832: options.local_forwards[i].host,
833: options.local_forwards[i].host_port,
834: options.gateway_ports);
835: }
1.86 markus 836: if (i > 0 && success == 0)
837: error("Could not request local forwarding.");
1.70 markus 838:
839: /* Initiate remote TCP/IP port forwardings. */
840: for (i = 0; i < options.num_remote_forwards; i++) {
841: debug("Connections to remote port %d forwarded to local address %.200s:%d",
842: options.remote_forwards[i].port,
843: options.remote_forwards[i].host,
844: options.remote_forwards[i].host_port);
845: channel_request_remote_forwarding(
846: options.remote_forwards[i].port,
847: options.remote_forwards[i].host,
848: options.remote_forwards[i].host_port);
849: }
850: }
851:
1.126 itojun 852: static void
1.70 markus 853: check_agent_present(void)
854: {
855: if (options.forward_agent) {
856: /* Clear agent forwarding if we don\'t have an agent. */
1.185 stevesk 857: if (!ssh_agent_present())
1.70 markus 858: options.forward_agent = 0;
859: }
860: }
861:
1.126 itojun 862: static int
1.45 markus 863: ssh_session(void)
864: {
865: int type;
866: int interactive = 0;
867: int have_tty = 0;
868: struct winsize ws;
869: char *cp;
870:
1.31 markus 871: /* Enable compression if requested. */
872: if (options.compression) {
873: debug("Requesting compression at level %d.", options.compression_level);
874:
875: if (options.compression_level < 1 || options.compression_level > 9)
876: fatal("Compression level must be from 1 (fast) to 9 (slow, best).");
877:
878: /* Send the request. */
879: packet_start(SSH_CMSG_REQUEST_COMPRESSION);
880: packet_put_int(options.compression_level);
881: packet_send();
882: packet_write_wait();
1.156 markus 883: type = packet_read();
1.31 markus 884: if (type == SSH_SMSG_SUCCESS)
885: packet_start_compression(options.compression_level);
886: else if (type == SSH_SMSG_FAILURE)
1.191 itojun 887: logit("Warning: Remote host refused compression.");
1.31 markus 888: else
889: packet_disconnect("Protocol error waiting for compression response.");
890: }
891: /* Allocate a pseudo tty if appropriate. */
892: if (tty_flag) {
893: debug("Requesting pty.");
894:
895: /* Start the packet. */
896: packet_start(SSH_CMSG_REQUEST_PTY);
897:
898: /* Store TERM in the packet. There is no limit on the
899: length of the string. */
900: cp = getenv("TERM");
901: if (!cp)
902: cp = "";
1.124 markus 903: packet_put_cstring(cp);
1.31 markus 904:
905: /* Store window size in the packet. */
906: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
907: memset(&ws, 0, sizeof(ws));
908: packet_put_int(ws.ws_row);
909: packet_put_int(ws.ws_col);
910: packet_put_int(ws.ws_xpixel);
911: packet_put_int(ws.ws_ypixel);
912:
913: /* Store tty modes in the packet. */
1.115 stevesk 914: tty_make_modes(fileno(stdin), NULL);
1.31 markus 915:
916: /* Send the packet, and wait for it to leave. */
917: packet_send();
918: packet_write_wait();
919:
920: /* Read response from the server. */
1.156 markus 921: type = packet_read();
1.43 markus 922: if (type == SSH_SMSG_SUCCESS) {
1.31 markus 923: interactive = 1;
1.45 markus 924: have_tty = 1;
1.43 markus 925: } else if (type == SSH_SMSG_FAILURE)
1.191 itojun 926: logit("Warning: Remote host failed or refused to allocate a pseudo tty.");
1.31 markus 927: else
928: packet_disconnect("Protocol error waiting for pty request response.");
929: }
930: /* Request X11 forwarding if enabled and DISPLAY is set. */
931: if (options.forward_x11 && getenv("DISPLAY") != NULL) {
1.150 stevesk 932: char *proto, *data;
1.50 markus 933: /* Get reasonable local authentication information. */
1.150 stevesk 934: x11_get_proto(&proto, &data);
1.50 markus 935: /* Request forwarding with authentication spoofing. */
1.31 markus 936: debug("Requesting X11 forwarding with authentication spoofing.");
1.50 markus 937: x11_request_forwarding_with_spoofing(0, proto, data);
1.31 markus 938:
939: /* Read response from the server. */
1.156 markus 940: type = packet_read();
1.31 markus 941: if (type == SSH_SMSG_SUCCESS) {
942: interactive = 1;
1.50 markus 943: } else if (type == SSH_SMSG_FAILURE) {
1.191 itojun 944: logit("Warning: Remote host denied X11 forwarding.");
1.50 markus 945: } else {
1.31 markus 946: packet_disconnect("Protocol error waiting for X11 forwarding");
1.50 markus 947: }
1.31 markus 948: }
949: /* Tell the packet module whether this is an interactive session. */
1.80 markus 950: packet_set_interactive(interactive);
1.31 markus 951:
952: /* Request authentication agent forwarding if appropriate. */
1.70 markus 953: check_agent_present();
954:
1.31 markus 955: if (options.forward_agent) {
956: debug("Requesting authentication agent forwarding.");
957: auth_request_forwarding();
958:
959: /* Read response from the server. */
1.156 markus 960: type = packet_read();
1.155 markus 961: packet_check_eom();
1.31 markus 962: if (type != SSH_SMSG_SUCCESS)
1.191 itojun 963: logit("Warning: Remote host denied authentication agent forwarding.");
1.31 markus 964: }
965:
1.70 markus 966: /* Initiate port forwardings. */
967: ssh_init_forwarding();
1.34 markus 968:
969: /* If requested, let ssh continue in the background. */
1.48 markus 970: if (fork_after_authentication_flag)
1.34 markus 971: if (daemon(1, 1) < 0)
972: fatal("daemon() failed: %.200s", strerror(errno));
1.31 markus 973:
1.33 markus 974: /*
975: * If a command was specified on the command line, execute the
976: * command now. Otherwise request the server to start a shell.
977: */
1.31 markus 978: if (buffer_len(&command) > 0) {
979: int len = buffer_len(&command);
980: if (len > 900)
981: len = 900;
1.152 stevesk 982: debug("Sending command: %.*s", len, (u_char *)buffer_ptr(&command));
1.31 markus 983: packet_start(SSH_CMSG_EXEC_CMD);
984: packet_put_string(buffer_ptr(&command), buffer_len(&command));
985: packet_send();
986: packet_write_wait();
987: } else {
988: debug("Requesting shell.");
989: packet_start(SSH_CMSG_EXEC_SHELL);
990: packet_send();
991: packet_write_wait();
992: }
993:
994: /* Enter the interactive session. */
1.119 stevesk 995: return client_loop(have_tty, tty_flag ?
996: options.escape_char : SSH_ESCAPECHAR_NONE, 0);
1.45 markus 997: }
998:
1.126 itojun 999: static void
1.157 markus 1000: client_subsystem_reply(int type, u_int32_t seq, void *ctxt)
1.89 markus 1001: {
1002: int id, len;
1003:
1004: id = packet_get_int();
1005: len = buffer_len(&command);
1.100 markus 1006: if (len > 900)
1007: len = 900;
1.155 markus 1008: packet_check_eom();
1.89 markus 1009: if (type == SSH2_MSG_CHANNEL_FAILURE)
1010: fatal("Request for subsystem '%.*s' failed on channel %d",
1.152 stevesk 1011: len, (u_char *)buffer_ptr(&command), id);
1.170 markus 1012: }
1013:
1014: void
1015: client_global_request_reply(int type, u_int32_t seq, void *ctxt)
1016: {
1017: int i;
1018:
1019: i = client_global_request_id++;
1020: if (i >= options.num_remote_forwards) {
1021: debug("client_global_request_reply: too many replies %d > %d",
1022: i, options.num_remote_forwards);
1023: return;
1024: }
1025: debug("remote forward %s for: listen %d, connect %s:%d",
1026: type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
1027: options.remote_forwards[i].port,
1028: options.remote_forwards[i].host,
1029: options.remote_forwards[i].host_port);
1030: if (type == SSH2_MSG_REQUEST_FAILURE)
1.191 itojun 1031: logit("Warning: remote port forwarding failed for listen port %d",
1.170 markus 1032: options.remote_forwards[i].port);
1.89 markus 1033: }
1034:
1.143 markus 1035: /* request pty/x11/agent/tcpfwd/shell for channel */
1.126 itojun 1036: static void
1.143 markus 1037: ssh_session2_setup(int id, void *arg)
1.45 markus 1038: {
1039: int len;
1.80 markus 1040: int interactive = 0;
1.115 stevesk 1041: struct termios tio;
1.80 markus 1042:
1.187 markus 1043: debug2("ssh_session2_setup: id %d", id);
1.31 markus 1044:
1.45 markus 1045: if (tty_flag) {
1046: struct winsize ws;
1047: char *cp;
1048: cp = getenv("TERM");
1049: if (!cp)
1050: cp = "";
1051: /* Store window size in the packet. */
1052: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
1053: memset(&ws, 0, sizeof(ws));
1054:
1055: channel_request_start(id, "pty-req", 0);
1056: packet_put_cstring(cp);
1057: packet_put_int(ws.ws_col);
1058: packet_put_int(ws.ws_row);
1059: packet_put_int(ws.ws_xpixel);
1060: packet_put_int(ws.ws_ypixel);
1.115 stevesk 1061: tio = get_saved_tio();
1062: tty_make_modes(/*ignored*/ 0, &tio);
1.45 markus 1063: packet_send();
1.80 markus 1064: interactive = 1;
1.45 markus 1065: /* XXX wait for reply */
1066: }
1.50 markus 1067: if (options.forward_x11 &&
1068: getenv("DISPLAY") != NULL) {
1.150 stevesk 1069: char *proto, *data;
1.50 markus 1070: /* Get reasonable local authentication information. */
1.150 stevesk 1071: x11_get_proto(&proto, &data);
1.50 markus 1072: /* Request forwarding with authentication spoofing. */
1073: debug("Requesting X11 forwarding with authentication spoofing.");
1074: x11_request_forwarding_with_spoofing(id, proto, data);
1.80 markus 1075: interactive = 1;
1.50 markus 1076: /* XXX wait for reply */
1077: }
1078:
1.70 markus 1079: check_agent_present();
1080: if (options.forward_agent) {
1081: debug("Requesting authentication agent forwarding.");
1082: channel_request_start(id, "auth-agent-req@openssh.com", 0);
1083: packet_send();
1084: }
1085:
1.45 markus 1086: len = buffer_len(&command);
1087: if (len > 0) {
1088: if (len > 900)
1089: len = 900;
1.85 djm 1090: if (subsystem_flag) {
1.152 stevesk 1091: debug("Sending subsystem: %.*s", len, (u_char *)buffer_ptr(&command));
1.89 markus 1092: channel_request_start(id, "subsystem", /*want reply*/ 1);
1093: /* register callback for reply */
1.172 deraadt 1094: /* XXX we assume that client_loop has already been called */
1.89 markus 1095: dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &client_subsystem_reply);
1096: dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &client_subsystem_reply);
1.85 djm 1097: } else {
1.152 stevesk 1098: debug("Sending command: %.*s", len, (u_char *)buffer_ptr(&command));
1.85 djm 1099: channel_request_start(id, "exec", 0);
1100: }
1.100 markus 1101: packet_put_string(buffer_ptr(&command), buffer_len(&command));
1.45 markus 1102: packet_send();
1103: } else {
1.161 markus 1104: channel_request_start(id, "shell", 0);
1105: packet_send();
1.45 markus 1106: }
1.90 markus 1107:
1.80 markus 1108: packet_set_interactive(interactive);
1.45 markus 1109: }
1110:
1.143 markus 1111: /* open new channel for a session */
1.126 itojun 1112: static int
1.143 markus 1113: ssh_session2_open(void)
1.45 markus 1114: {
1.118 markus 1115: Channel *c;
1116: int window, packetmax, in, out, err;
1.60 markus 1117:
1.62 markus 1118: if (stdin_null_flag) {
1.93 itojun 1119: in = open(_PATH_DEVNULL, O_RDONLY);
1.62 markus 1120: } else {
1121: in = dup(STDIN_FILENO);
1122: }
1.60 markus 1123: out = dup(STDOUT_FILENO);
1124: err = dup(STDERR_FILENO);
1.45 markus 1125:
1126: if (in < 0 || out < 0 || err < 0)
1.62 markus 1127: fatal("dup() in/out/err failed");
1.45 markus 1128:
1.69 markus 1129: /* enable nonblocking unless tty */
1130: if (!isatty(in))
1131: set_nonblock(in);
1132: if (!isatty(out))
1133: set_nonblock(out);
1134: if (!isatty(err))
1135: set_nonblock(err);
1136:
1.65 markus 1137: window = CHAN_SES_WINDOW_DEFAULT;
1138: packetmax = CHAN_SES_PACKET_DEFAULT;
1.164 markus 1139: if (tty_flag) {
1140: window >>= 1;
1141: packetmax >>= 1;
1.45 markus 1142: }
1.118 markus 1143: c = channel_new(
1.45 markus 1144: "session", SSH_CHANNEL_OPENING, in, out, err,
1.65 markus 1145: window, packetmax, CHAN_EXTENDED_WRITE,
1.192 markus 1146: "client-session", /*nonblock*/0);
1.45 markus 1147:
1.143 markus 1148: debug3("ssh_session2_open: channel_new: %d", c->self);
1.106 markus 1149:
1.122 markus 1150: channel_send_open(c->self);
1.143 markus 1151: if (!no_shell_flag)
1.160 markus 1152: channel_register_confirm(c->self, ssh_session2_setup);
1.106 markus 1153:
1.118 markus 1154: return c->self;
1.106 markus 1155: }
1156:
1.126 itojun 1157: static int
1.106 markus 1158: ssh_session2(void)
1159: {
1.143 markus 1160: int id = -1;
1.106 markus 1161:
1162: /* XXX should be pre-session */
1163: ssh_init_forwarding();
1164:
1.143 markus 1165: if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN))
1166: id = ssh_session2_open();
1.106 markus 1167:
1168: /* If requested, let ssh continue in the background. */
1169: if (fork_after_authentication_flag)
1170: if (daemon(1, 1) < 0)
1171: fatal("daemon() failed: %.200s", strerror(errno));
1.31 markus 1172:
1.119 stevesk 1173: return client_loop(tty_flag, tty_flag ?
1174: options.escape_char : SSH_ESCAPECHAR_NONE, id);
1.72 markus 1175: }
1176:
1.126 itojun 1177: static void
1.104 markus 1178: load_public_identity_files(void)
1179: {
1180: char *filename;
1.167 markus 1181: int i = 0;
1.104 markus 1182: Key *public;
1.167 markus 1183: #ifdef SMARTCARD
1184: Key **keys;
1.104 markus 1185:
1.133 markus 1186: if (options.smartcard_device != NULL &&
1.167 markus 1187: options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
1188: (keys = sc_get_keys(options.smartcard_device, NULL)) != NULL ) {
1189: int count = 0;
1190: for (i = 0; keys[i] != NULL; i++) {
1191: count++;
1192: memmove(&options.identity_files[1], &options.identity_files[0],
1193: sizeof(char *) * (SSH_MAX_IDENTITY_FILES - 1));
1194: memmove(&options.identity_keys[1], &options.identity_keys[0],
1195: sizeof(Key *) * (SSH_MAX_IDENTITY_FILES - 1));
1196: options.num_identity_files++;
1197: options.identity_keys[0] = keys[i];
1.194 markus 1198: options.identity_files[0] = sc_get_key_label(keys[i]);
1.167 markus 1199: }
1.168 markus 1200: if (options.num_identity_files > SSH_MAX_IDENTITY_FILES)
1201: options.num_identity_files = SSH_MAX_IDENTITY_FILES;
1.167 markus 1202: i = count;
1203: xfree(keys);
1.127 markus 1204: }
1.136 jakob 1205: #endif /* SMARTCARD */
1.131 millert 1206: for (; i < options.num_identity_files; i++) {
1207: filename = tilde_expand_filename(options.identity_files[i],
1208: original_real_uid);
1209: public = key_load_public(filename, NULL);
1210: debug("identity file %s type %d", filename,
1211: public ? public->type : -1);
1212: xfree(options.identity_files[i]);
1213: options.identity_files[i] = filename;
1214: options.identity_keys[i] = public;
1215: }
1.1 deraadt 1216: }
![[BACK]](/icons/back.gif){kind=icon}
Return to ssh.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / src / usr.bin / ssh