Annotation of src/usr.bin/ssh/ssh.c, Revision 1.333
1.333 ! markus 1: /* $OpenBSD: ssh.c,v 1.332 2010/01/26 01:28:35 djm Exp $ */
1.1 deraadt 2: /*
1.32 deraadt 3: * Author: Tatu Ylonen <ylo@cs.hut.fi>
4: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5: * All rights reserved
6: * Ssh client program. This program can be used to log into a remote machine.
7: * The software supports strong authentication, encryption, and forwarding
8: * of X11, TCP/IP, and authentication connections.
9: *
1.64 deraadt 10: * As far as I am concerned, the code I have written for this software
11: * can be used freely for any purpose. Any derived versions of this
12: * software must be clearly marked as such, and if the derived work is
13: * incompatible with the protocol description in the RFC file, it must be
14: * called by a name other than "ssh" or "Secure Shell".
15: *
16: * Copyright (c) 1999 Niels Provos. All rights reserved.
1.202 markus 17: * Copyright (c) 2000, 2001, 2002, 2003 Markus Friedl. All rights reserved.
1.64 deraadt 18: *
19: * Modified to work with SSL by Niels Provos <provos@citi.umich.edu>
20: * in Canada (German citizen).
21: *
22: * Redistribution and use in source and binary forms, with or without
23: * modification, are permitted provided that the following conditions
24: * are met:
25: * 1. Redistributions of source code must retain the above copyright
26: * notice, this list of conditions and the following disclaimer.
27: * 2. Redistributions in binary form must reproduce the above copyright
28: * notice, this list of conditions and the following disclaimer in the
29: * documentation and/or other materials provided with the distribution.
30: *
31: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
32: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
33: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
34: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
35: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
36: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
37: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
38: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
39: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
40: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.32 deraadt 41: */
1.1 deraadt 42:
1.293 deraadt 43: #include <sys/types.h>
1.312 djm 44: #include <sys/ioctl.h>
1.326 dtucker 45: #include <sys/param.h>
1.312 djm 46: #include <sys/queue.h>
1.259 stevesk 47: #include <sys/resource.h>
1.280 stevesk 48: #include <sys/socket.h>
1.264 stevesk 49: #include <sys/stat.h>
1.312 djm 50: #include <sys/types.h>
51: #include <sys/time.h>
1.258 stevesk 52:
1.265 stevesk 53: #include <ctype.h>
1.285 stevesk 54: #include <errno.h>
1.281 stevesk 55: #include <fcntl.h>
1.286 stevesk 56: #include <netdb.h>
1.258 stevesk 57: #include <paths.h>
1.279 stevesk 58: #include <pwd.h>
1.263 stevesk 59: #include <signal.h>
1.287 stevesk 60: #include <stddef.h>
1.291 stevesk 61: #include <stdio.h>
1.290 stevesk 62: #include <stdlib.h>
1.289 stevesk 63: #include <string.h>
1.288 stevesk 64: #include <unistd.h>
1.49 markus 65:
66: #include <openssl/evp.h>
1.72 markus 67: #include <openssl/err.h>
1.1 deraadt 68:
1.293 deraadt 69: #include "xmalloc.h"
1.84 markus 70: #include "ssh.h"
71: #include "ssh1.h"
72: #include "ssh2.h"
73: #include "compat.h"
74: #include "cipher.h"
1.1 deraadt 75: #include "packet.h"
76: #include "buffer.h"
1.123 markus 77: #include "channels.h"
1.49 markus 78: #include "key.h"
1.58 markus 79: #include "authfd.h"
1.49 markus 80: #include "authfile.h"
1.83 markus 81: #include "pathnames.h"
1.214 djm 82: #include "dispatch.h"
1.81 markus 83: #include "clientloop.h"
1.84 markus 84: #include "log.h"
85: #include "readconf.h"
86: #include "sshconnect.h"
87: #include "misc.h"
1.95 markus 88: #include "kex.h"
89: #include "mac.h"
1.213 deraadt 90: #include "sshpty.h"
1.212 djm 91: #include "match.h"
1.214 djm 92: #include "msg.h"
1.225 dtucker 93: #include "uidswap.h"
1.327 andreas 94: #include "roaming.h"
1.278 stevesk 95: #include "version.h"
1.49 markus 96:
1.333 ! markus 97: #ifdef ENABLE_PKCS11
! 98: #include "ssh-pkcs11.h"
1.137 jakob 99: #endif
1.127 markus 100:
1.49 markus 101: extern char *__progname;
1.1 deraadt 102:
1.316 djm 103: /* Flag indicating whether debug mode is on. May be set on the command line. */
1.1 deraadt 104: int debug_flag = 0;
105:
1.46 markus 106: /* Flag indicating whether a tty should be allocated */
1.1 deraadt 107: int tty_flag = 0;
1.79 markus 108: int no_tty_flag = 0;
109: int force_tty_flag = 0;
1.1 deraadt 110:
1.45 markus 111: /* don't exec a shell */
112: int no_shell_flag = 0;
113:
1.33 markus 114: /*
115: * Flag indicating that nothing should be read from stdin. This can be set
116: * on the command line.
117: */
1.1 deraadt 118: int stdin_null_flag = 0;
119:
1.33 markus 120: /*
121: * Flag indicating that ssh should fork after authentication. This is useful
1.172 deraadt 122: * so that the passphrase can be entered manually, and then ssh goes to the
1.33 markus 123: * background.
124: */
1.1 deraadt 125: int fork_after_authentication_flag = 0;
126:
1.331 dtucker 127: /* forward stdio to remote host and port */
128: char *stdio_forward_host = NULL;
129: int stdio_forward_port = 0;
130:
1.33 markus 131: /*
132: * General data structure for command line options and options configurable
133: * in configuration files. See readconf.h.
134: */
1.1 deraadt 135: Options options;
136:
1.139 markus 137: /* optional user configfile */
138: char *config = NULL;
139:
1.33 markus 140: /*
141: * Name of the host we are connecting to. This is the name given on the
142: * command line, or the HostName specified for the user-supplied name in a
143: * configuration file.
144: */
1.1 deraadt 145: char *host;
146:
1.22 provos 147: /* socket address the host resolves to */
1.37 markus 148: struct sockaddr_storage hostaddr;
1.1 deraadt 149:
1.112 markus 150: /* Private host keys. */
1.173 markus 151: Sensitive sensitive_data;
1.1 deraadt 152:
1.10 dugsong 153: /* Original real UID. */
154: uid_t original_real_uid;
1.177 markus 155: uid_t original_effective_uid;
1.1 deraadt 156:
1.45 markus 157: /* command to be executed */
158: Buffer command;
159:
1.85 djm 160: /* Should we execute a command or invoke a subsystem? */
161: int subsystem_flag = 0;
162:
1.170 markus 163: /* # of replies received for global requests */
1.315 djm 164: static int remote_forward_confirms_received = 0;
1.170 markus 165:
1.186 djm 166: /* pid of proxycommand child process */
167: pid_t proxy_command_pid = 0;
1.313 djm 168:
169: /* mux.c */
170: extern int muxserver_sock;
171: extern u_int muxclient_command;
172:
1.186 djm 173:
1.1 deraadt 174: /* Prints a help message to the user. This function never returns. */
175:
1.126 itojun 176: static void
1.93 itojun 177: usage(void)
1.1 deraadt 178: {
1.208 markus 179: fprintf(stderr,
1.321 jmc 180: "usage: ssh [-1246AaCfgKkMNnqsTtVvXxYy] [-b bind_address] [-c cipher_spec]\n"
1.251 jmc 181: " [-D [bind_address:]port] [-e escape_char] [-F configfile]\n"
1.233 jmc 182: " [-i identity_file] [-L [bind_address:]port:host:hostport]\n"
1.232 djm 183: " [-l login_name] [-m mac_spec] [-O ctl_cmd] [-o option] [-p port]\n"
1.233 jmc 184: " [-R [bind_address:]port:host:hostport] [-S ctl_path]\n"
1.331 dtucker 185: " [-W host:port] [-w local_tun[:remote_tun]]\n"
186: " [user@]hostname [command]\n"
1.208 markus 187: );
1.257 dtucker 188: exit(255);
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);
1.312 djm 194:
195: /* from muxclient.c */
196: void muxclient(const char *);
197: void muxserver_listen(void);
1.45 markus 198:
1.32 deraadt 199: /*
200: * Main program for the ssh client.
201: */
1.2 provos 202: int
203: main(int ac, char **av)
1.1 deraadt 204: {
1.326 dtucker 205: int i, r, opt, exit_status, use_syslog;
206: char *p, *cp, *line, *argv0, buf[MAXPATHLEN];
1.31 markus 207: struct stat st;
1.98 markus 208: struct passwd *pw;
1.303 djm 209: int dummy, timeout_ms;
1.144 stevesk 210: extern int optind, optreset;
211: extern char *optarg;
1.244 djm 212: struct servent *sp;
1.232 djm 213: Forward fwd;
1.250 djm 214:
215: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
216: sanitise_stdfd();
1.31 markus 217:
1.33 markus 218: /*
219: * Save the original real uid. It will be needed later (uid-swapping
220: * may clobber the real uid).
221: */
1.31 markus 222: original_real_uid = getuid();
223: original_effective_uid = geteuid();
224:
1.184 stevesk 225: /*
226: * Use uid-swapping to give up root privileges for the duration of
227: * option processing. We will re-instantiate the rights when we are
228: * ready to create the privileged port, and will permanently drop
229: * them when the port has been created (actually, when the connection
230: * has been made, as we may need to create the port several times).
231: */
232: PRIV_END;
233:
1.31 markus 234: /* If we are installed setuid root be careful to not drop core. */
235: if (original_real_uid != original_effective_uid) {
236: struct rlimit rlim;
237: rlim.rlim_cur = rlim.rlim_max = 0;
238: if (setrlimit(RLIMIT_CORE, &rlim) < 0)
239: fatal("setrlimit failed: %.100s", strerror(errno));
1.1 deraadt 240: }
1.107 markus 241: /* Get user data. */
242: pw = getpwuid(original_real_uid);
243: if (!pw) {
1.191 itojun 244: logit("You don't exist, go away!");
1.257 dtucker 245: exit(255);
1.107 markus 246: }
247: /* Take a copy of the returned structure. */
248: pw = pwcopy(pw);
1.31 markus 249:
1.33 markus 250: /*
251: * Set our umask to something reasonable, as some files are created
252: * with the default umask. This will make them world-readable but
253: * writable only by the owner, which is ok for all files for which we
254: * don't set the modes explicitly.
255: */
1.31 markus 256: umask(022);
257:
1.316 djm 258: /*
259: * Initialize option structure to indicate that no values have been
260: * set.
261: */
1.31 markus 262: initialize_options(&options);
263:
264: /* Parse command-line arguments. */
265: host = NULL;
1.320 djm 266: use_syslog = 0;
1.325 markus 267: argv0 = av[0];
1.31 markus 268:
1.266 djm 269: again:
1.316 djm 270: while ((opt = getopt(ac, av, "1246ab:c:e:fgi:kl:m:no:p:qstvx"
1.331 dtucker 271: "ACD:F:I:KL:MNO:PR:S:TVw:W:XYy")) != -1) {
1.31 markus 272: switch (opt) {
1.91 jakob 273: case '1':
274: options.protocol = SSH_PROTO_1;
275: break;
1.47 markus 276: case '2':
277: options.protocol = SSH_PROTO_2;
278: break;
1.37 markus 279: case '4':
1.196 djm 280: options.address_family = AF_INET;
1.37 markus 281: break;
282: case '6':
1.196 djm 283: options.address_family = AF_INET6;
1.37 markus 284: break;
1.31 markus 285: case 'n':
286: stdin_null_flag = 1;
287: break;
288: case 'f':
289: fork_after_authentication_flag = 1;
290: stdin_null_flag = 1;
291: break;
292: case 'x':
293: options.forward_x11 = 0;
294: break;
295: case 'X':
296: options.forward_x11 = 1;
297: break;
1.320 djm 298: case 'y':
299: use_syslog = 1;
300: break;
1.202 markus 301: case 'Y':
302: options.forward_x11 = 1;
303: options.forward_x11_trusted = 1;
304: break;
1.31 markus 305: case 'g':
306: options.gateway_ports = 1;
307: break;
1.229 djm 308: case 'O':
1.332 djm 309: if (stdio_forward_host != NULL)
310: fatal("Cannot specify multiplexing "
311: "command with -W");
312: else if (muxclient_command != 0)
313: fatal("Multiplexing command already specified");
1.229 djm 314: if (strcmp(optarg, "check") == 0)
1.312 djm 315: muxclient_command = SSHMUX_COMMAND_ALIVE_CHECK;
1.229 djm 316: else if (strcmp(optarg, "exit") == 0)
1.312 djm 317: muxclient_command = SSHMUX_COMMAND_TERMINATE;
1.229 djm 318: else
319: fatal("Invalid multiplex command.");
320: break;
1.183 stevesk 321: case 'P': /* deprecated */
1.31 markus 322: options.use_privileged_port = 0;
323: break;
324: case 'a':
325: options.forward_agent = 0;
1.53 markus 326: break;
327: case 'A':
328: options.forward_agent = 1;
1.31 markus 329: break;
330: case 'k':
1.204 dtucker 331: options.gss_deleg_creds = 0;
1.297 djm 332: break;
333: case 'K':
334: options.gss_authentication = 1;
335: options.gss_deleg_creds = 1;
1.31 markus 336: break;
337: case 'i':
338: if (stat(optarg, &st) < 0) {
1.128 fgsch 339: fprintf(stderr, "Warning: Identity file %s "
1.231 otto 340: "not accessible: %s.\n", optarg,
341: strerror(errno));
1.31 markus 342: break;
343: }
1.128 fgsch 344: if (options.num_identity_files >=
345: SSH_MAX_IDENTITY_FILES)
346: fatal("Too many identity files specified "
347: "(max %d)", SSH_MAX_IDENTITY_FILES);
348: options.identity_files[options.num_identity_files++] =
349: xstrdup(optarg);
1.31 markus 350: break;
1.127 markus 351: case 'I':
1.333 ! markus 352: #ifdef ENABLE_PKCS11
! 353: options.pkcs11_provider = xstrdup(optarg);
1.137 jakob 354: #else
1.333 ! markus 355: fprintf(stderr, "no support for PKCS#11.\n");
1.137 jakob 356: #endif
1.127 markus 357: break;
1.31 markus 358: case 't':
1.79 markus 359: if (tty_flag)
360: force_tty_flag = 1;
1.31 markus 361: tty_flag = 1;
362: break;
363: case 'v':
1.197 markus 364: if (debug_flag == 0) {
1.66 markus 365: debug_flag = 1;
366: options.log_level = SYSLOG_LEVEL_DEBUG1;
1.197 markus 367: } else {
368: if (options.log_level < SYSLOG_LEVEL_DEBUG3)
369: options.log_level++;
1.66 markus 370: break;
1.197 markus 371: }
1.227 deraadt 372: /* FALLTHROUGH */
1.31 markus 373: case 'V':
1.209 markus 374: fprintf(stderr, "%s, %s\n",
375: SSH_VERSION, SSLeay_version(SSLEAY_VERSION));
1.31 markus 376: if (opt == 'V')
377: exit(0);
378: break;
1.255 reyk 379: case 'w':
1.256 reyk 380: if (options.tun_open == -1)
381: options.tun_open = SSH_TUNMODE_DEFAULT;
1.255 reyk 382: options.tun_local = a2tun(optarg, &options.tun_remote);
1.256 reyk 383: if (options.tun_local == SSH_TUNID_ERR) {
1.316 djm 384: fprintf(stderr,
385: "Bad tun device '%s'\n", optarg);
1.257 dtucker 386: exit(255);
1.255 reyk 387: }
388: break;
1.331 dtucker 389: case 'W':
1.332 djm 390: if (stdio_forward_host != NULL)
391: fatal("stdio forward already specified");
392: if (muxclient_command != 0)
393: fatal("Cannot specify stdio forward with -O");
1.331 dtucker 394: if (parse_forward(&fwd, optarg, 1, 0)) {
395: stdio_forward_host = fwd.listen_host;
396: stdio_forward_port = fwd.listen_port;
397: xfree(fwd.connect_host);
398: } else {
399: fprintf(stderr,
400: "Bad stdio forwarding specification '%s'\n",
401: optarg);
402: exit(255);
403: }
404: no_tty_flag = 1;
405: no_shell_flag = 1;
406: options.clear_forwardings = 1;
407: options.exit_on_forward_failure = 1;
408: break;
1.31 markus 409: case 'q':
410: options.log_level = SYSLOG_LEVEL_QUIET;
411: break;
412: case 'e':
413: if (optarg[0] == '^' && optarg[2] == 0 &&
1.128 fgsch 414: (u_char) optarg[1] >= 64 &&
415: (u_char) optarg[1] < 128)
1.78 markus 416: options.escape_char = (u_char) optarg[1] & 31;
1.31 markus 417: else if (strlen(optarg) == 1)
1.78 markus 418: options.escape_char = (u_char) optarg[0];
1.31 markus 419: else if (strcmp(optarg, "none") == 0)
1.119 stevesk 420: options.escape_char = SSH_ESCAPECHAR_NONE;
1.31 markus 421: else {
1.128 fgsch 422: fprintf(stderr, "Bad escape character '%s'.\n",
423: optarg);
1.257 dtucker 424: exit(255);
1.31 markus 425: }
426: break;
427: case 'c':
1.49 markus 428: if (ciphers_valid(optarg)) {
429: /* SSH2 only */
430: options.ciphers = xstrdup(optarg);
1.224 markus 431: options.cipher = SSH_CIPHER_INVALID;
1.49 markus 432: } else {
433: /* SSH1 only */
1.74 markus 434: options.cipher = cipher_number(optarg);
435: if (options.cipher == -1) {
1.128 fgsch 436: fprintf(stderr,
437: "Unknown cipher type '%s'\n",
438: optarg);
1.257 dtucker 439: exit(255);
1.49 markus 440: }
1.128 fgsch 441: if (options.cipher == SSH_CIPHER_3DES)
1.74 markus 442: options.ciphers = "3des-cbc";
1.128 fgsch 443: else if (options.cipher == SSH_CIPHER_BLOWFISH)
1.74 markus 444: options.ciphers = "blowfish-cbc";
1.128 fgsch 445: else
1.74 markus 446: options.ciphers = (char *)-1;
1.95 markus 447: }
448: break;
449: case 'm':
450: if (mac_valid(optarg))
451: options.macs = xstrdup(optarg);
452: else {
1.128 fgsch 453: fprintf(stderr, "Unknown mac type '%s'\n",
454: optarg);
1.257 dtucker 455: exit(255);
1.31 markus 456: }
457: break;
1.214 djm 458: case 'M':
1.242 djm 459: if (options.control_master == SSHCTL_MASTER_YES)
460: options.control_master = SSHCTL_MASTER_ASK;
461: else
462: options.control_master = SSHCTL_MASTER_YES;
1.214 djm 463: break;
1.31 markus 464: case 'p':
1.113 stevesk 465: options.port = a2port(optarg);
1.323 djm 466: if (options.port <= 0) {
1.109 markus 467: fprintf(stderr, "Bad port '%s'\n", optarg);
1.257 dtucker 468: exit(255);
1.109 markus 469: }
1.31 markus 470: break;
471: case 'l':
472: options.user = optarg;
473: break;
1.141 stevesk 474:
475: case 'L':
1.324 djm 476: if (parse_forward(&fwd, optarg, 0, 0))
1.232 djm 477: add_local_forward(&options, &fwd);
478: else {
1.128 fgsch 479: fprintf(stderr,
1.232 djm 480: "Bad local forwarding specification '%s'\n",
1.128 fgsch 481: optarg);
1.257 dtucker 482: exit(255);
1.31 markus 483: }
1.232 djm 484: break;
485:
486: case 'R':
1.324 djm 487: if (parse_forward(&fwd, optarg, 0, 1)) {
1.232 djm 488: add_remote_forward(&options, &fwd);
489: } else {
1.128 fgsch 490: fprintf(stderr,
1.232 djm 491: "Bad remote forwarding specification "
492: "'%s'\n", optarg);
1.257 dtucker 493: exit(255);
1.31 markus 494: }
495: break;
1.108 markus 496:
497: case 'D':
1.324 djm 498: if (parse_forward(&fwd, optarg, 1, 0)) {
1.322 stevesk 499: add_local_forward(&options, &fwd);
1.232 djm 500: } else {
1.322 stevesk 501: fprintf(stderr,
502: "Bad dynamic forwarding specification "
503: "'%s'\n", optarg);
1.257 dtucker 504: exit(255);
1.109 markus 505: }
1.108 markus 506: break;
507:
1.31 markus 508: case 'C':
509: options.compression = 1;
510: break;
1.45 markus 511: case 'N':
512: no_shell_flag = 1;
513: no_tty_flag = 1;
514: break;
515: case 'T':
516: no_tty_flag = 1;
517: break;
1.31 markus 518: case 'o':
519: dummy = 1;
1.205 markus 520: line = xstrdup(optarg);
1.128 fgsch 521: if (process_config_line(&options, host ? host : "",
1.205 markus 522: line, "command-line", 0, &dummy) != 0)
1.257 dtucker 523: exit(255);
1.205 markus 524: xfree(line);
1.31 markus 525: break;
1.85 djm 526: case 's':
527: subsystem_flag = 1;
1.117 markus 528: break;
1.214 djm 529: case 'S':
530: if (options.control_path != NULL)
531: free(options.control_path);
532: options.control_path = xstrdup(optarg);
533: break;
1.117 markus 534: case 'b':
535: options.bind_address = optarg;
1.85 djm 536: break;
1.139 markus 537: case 'F':
538: config = optarg;
539: break;
1.31 markus 540: default:
541: usage();
1.1 deraadt 542: }
1.31 markus 543: }
544:
1.128 fgsch 545: ac -= optind;
546: av += optind;
547:
1.329 guenther 548: if (ac > 0 && !host) {
1.188 markus 549: if (strrchr(*av, '@')) {
1.128 fgsch 550: p = xstrdup(*av);
1.188 markus 551: cp = strrchr(p, '@');
1.128 fgsch 552: if (cp == NULL || cp == p)
553: usage();
554: options.user = p;
555: *cp = '\0';
556: host = ++cp;
557: } else
558: host = *av;
1.189 millert 559: if (ac > 1) {
560: optind = optreset = 1;
1.128 fgsch 561: goto again;
562: }
1.189 millert 563: ac--, av++;
1.128 fgsch 564: }
565:
1.31 markus 566: /* Check that we got a host name. */
567: if (!host)
568: usage();
569:
1.54 markus 570: SSLeay_add_all_algorithms();
1.72 markus 571: ERR_load_crypto_strings();
1.31 markus 572:
573: /* Initialize the command to execute on remote host. */
574: buffer_init(&command);
1.1 deraadt 575:
1.33 markus 576: /*
577: * Save the command to execute on the remote host in a buffer. There
578: * is no limit on the length of the command, except by the maximum
579: * packet size. Also sets the tty flag if there is no command.
580: */
1.128 fgsch 581: if (!ac) {
1.31 markus 582: /* No command specified - execute shell on a tty. */
583: tty_flag = 1;
1.85 djm 584: if (subsystem_flag) {
1.128 fgsch 585: fprintf(stderr,
586: "You must specify a subsystem to invoke.\n");
1.85 djm 587: usage();
588: }
1.31 markus 589: } else {
1.128 fgsch 590: /* A command has been specified. Store it into the buffer. */
591: for (i = 0; i < ac; i++) {
592: if (i)
1.31 markus 593: buffer_append(&command, " ", 1);
594: buffer_append(&command, av[i], strlen(av[i]));
595: }
596: }
597:
598: /* Cannot fork to background if no command. */
1.316 djm 599: if (fork_after_authentication_flag && buffer_len(&command) == 0 &&
600: !no_shell_flag)
601: fatal("Cannot fork into background without a command "
602: "to execute.");
1.31 markus 603:
604: /* Allocate a tty by default if no command specified. */
605: if (buffer_len(&command) == 0)
606: tty_flag = 1;
607:
1.180 deraadt 608: /* Force no tty */
1.75 markus 609: if (no_tty_flag)
610: tty_flag = 0;
1.31 markus 611: /* Do not allocate a tty if stdin is not a tty. */
1.236 djm 612: if ((!isatty(fileno(stdin)) || stdin_null_flag) && !force_tty_flag) {
1.31 markus 613: if (tty_flag)
1.316 djm 614: logit("Pseudo-terminal will not be allocated because "
615: "stdin is not a terminal.");
1.31 markus 616: tty_flag = 0;
617: }
1.45 markus 618:
1.101 markus 619: /*
620: * Initialize "log" output. Since we are the client all output
621: * actually goes to stderr.
622: */
1.325 markus 623: log_init(argv0,
1.316 djm 624: options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level,
1.320 djm 625: SYSLOG_FACILITY_USER, !use_syslog);
1.31 markus 626:
1.139 markus 627: /*
628: * Read per-user configuration file. Ignore the system wide config
629: * file if the user specifies a config file on the command line.
630: */
631: if (config != NULL) {
1.211 djm 632: if (!read_config_file(config, host, &options, 0))
1.142 stevesk 633: fatal("Can't open user config file %.100s: "
634: "%.100s", config, strerror(errno));
1.295 stevesk 635: } else {
1.326 dtucker 636: r = snprintf(buf, sizeof buf, "%s/%s", pw->pw_dir,
1.139 markus 637: _PATH_SSH_USER_CONFFILE);
1.326 dtucker 638: if (r > 0 && (size_t)r < sizeof(buf))
639: (void)read_config_file(buf, host, &options, 1);
1.139 markus 640:
1.145 markus 641: /* Read systemwide configuration file after use config. */
1.223 deraadt 642: (void)read_config_file(_PATH_HOST_CONFIG_FILE, host,
1.210 djm 643: &options, 0);
1.139 markus 644: }
1.31 markus 645:
646: /* Fill configuration defaults. */
647: fill_default_options(&options);
648:
1.196 djm 649: channel_set_af(options.address_family);
650:
1.31 markus 651: /* reinit */
1.325 markus 652: log_init(argv0, options.log_level, SYSLOG_FACILITY_USER, !use_syslog);
1.31 markus 653:
654: if (options.user == NULL)
655: options.user = xstrdup(pw->pw_name);
656:
1.317 dtucker 657: /* Get default port if port has not been set. */
658: if (options.port == 0) {
659: sp = getservbyname(SSH_SERVICE_NAME, "tcp");
660: options.port = sp ? ntohs(sp->s_port) : SSH_DEFAULT_PORT;
661: }
662:
663: if (options.local_command != NULL) {
664: char thishost[NI_MAXHOST];
665:
666: if (gethostname(thishost, sizeof(thishost)) == -1)
667: fatal("gethostname: %s", strerror(errno));
668: snprintf(buf, sizeof(buf), "%d", options.port);
669: debug3("expanding LocalCommand: %s", options.local_command);
670: cp = options.local_command;
671: options.local_command = percent_expand(cp, "d", pw->pw_dir,
672: "h", options.hostname? options.hostname : host,
673: "l", thishost, "n", host, "r", options.user, "p", buf,
674: "u", pw->pw_name, (char *)NULL);
675: debug3("expanded LocalCommand: %s", options.local_command);
676: xfree(cp);
677: }
678:
1.31 markus 679: if (options.hostname != NULL)
680: host = options.hostname;
1.195 markus 681:
682: /* force lowercase for hostkey matching */
683: if (options.host_key_alias != NULL) {
684: for (p = options.host_key_alias; *p; p++)
685: if (isupper(*p))
1.271 deraadt 686: *p = (char)tolower(*p);
1.246 djm 687: }
688:
1.190 markus 689: if (options.proxy_command != NULL &&
1.304 dtucker 690: strcmp(options.proxy_command, "none") == 0) {
691: xfree(options.proxy_command);
1.190 markus 692: options.proxy_command = NULL;
1.304 dtucker 693: }
1.245 djm 694: if (options.control_path != NULL &&
1.304 dtucker 695: strcmp(options.control_path, "none") == 0) {
696: xfree(options.control_path);
1.245 djm 697: options.control_path = NULL;
1.304 dtucker 698: }
1.31 markus 699:
1.214 djm 700: if (options.control_path != NULL) {
1.275 djm 701: char thishost[NI_MAXHOST];
1.261 djm 702:
1.275 djm 703: if (gethostname(thishost, sizeof(thishost)) == -1)
1.261 djm 704: fatal("gethostname: %s", strerror(errno));
1.241 djm 705: snprintf(buf, sizeof(buf), "%d", options.port);
706: cp = tilde_expand_filename(options.control_path,
707: original_real_uid);
1.304 dtucker 708: xfree(options.control_path);
1.241 djm 709: options.control_path = percent_expand(cp, "p", buf, "h", host,
1.275 djm 710: "r", options.user, "l", thishost, (char *)NULL);
1.241 djm 711: xfree(cp);
1.214 djm 712: }
1.312 djm 713: if (muxclient_command != 0 && options.control_path == NULL)
1.240 djm 714: fatal("No ControlPath specified for \"-O\" command");
1.242 djm 715: if (options.control_path != NULL)
1.312 djm 716: muxclient(options.control_path);
1.214 djm 717:
1.303 djm 718: timeout_ms = options.connection_timeout * 1000;
719:
1.77 markus 720: /* Open a connection to the remote host. */
1.203 djm 721: if (ssh_connect(host, &hostaddr, options.port,
1.303 djm 722: options.address_family, options.connection_attempts, &timeout_ms,
723: options.tcp_keep_alive,
1.177 markus 724: original_effective_uid == 0 && options.use_privileged_port,
1.179 markus 725: options.proxy_command) != 0)
1.257 dtucker 726: exit(255);
1.31 markus 727:
1.303 djm 728: if (timeout_ms > 0)
729: debug3("timeout: %d ms remain after connect", timeout_ms);
730:
1.33 markus 731: /*
732: * If we successfully made the connection, load the host private key
733: * in case we will need it later for combined rsa-rhosts
734: * authentication. This must be done before releasing extra
735: * privileges, because the file is only readable by root.
1.174 markus 736: * If we cannot access the private keys, load the public keys
737: * instead and try to execute the ssh-keysign helper instead.
1.33 markus 738: */
1.112 markus 739: sensitive_data.nkeys = 0;
740: sensitive_data.keys = NULL;
1.173 markus 741: sensitive_data.external_keysign = 0;
1.178 markus 742: if (options.rhosts_rsa_authentication ||
743: options.hostbased_authentication) {
1.112 markus 744: sensitive_data.nkeys = 3;
1.274 deraadt 745: sensitive_data.keys = xcalloc(sensitive_data.nkeys,
1.180 deraadt 746: sizeof(Key));
1.177 markus 747:
748: PRIV_START;
1.112 markus 749: sensitive_data.keys[0] = key_load_private_type(KEY_RSA1,
1.276 dtucker 750: _PATH_HOST_KEY_FILE, "", NULL, NULL);
1.112 markus 751: sensitive_data.keys[1] = key_load_private_type(KEY_DSA,
1.276 dtucker 752: _PATH_HOST_DSA_KEY_FILE, "", NULL, NULL);
1.112 markus 753: sensitive_data.keys[2] = key_load_private_type(KEY_RSA,
1.276 dtucker 754: _PATH_HOST_RSA_KEY_FILE, "", NULL, NULL);
1.177 markus 755: PRIV_END;
1.173 markus 756:
1.181 markus 757: if (options.hostbased_authentication == 1 &&
758: sensitive_data.keys[0] == NULL &&
1.173 markus 759: sensitive_data.keys[1] == NULL &&
760: sensitive_data.keys[2] == NULL) {
761: sensitive_data.keys[1] = key_load_public(
762: _PATH_HOST_DSA_KEY_FILE, NULL);
763: sensitive_data.keys[2] = key_load_public(
764: _PATH_HOST_RSA_KEY_FILE, NULL);
765: sensitive_data.external_keysign = 1;
766: }
1.31 markus 767: }
1.33 markus 768: /*
769: * Get rid of any extra privileges that we may have. We will no
770: * longer need them. Also, extra privileges could make it very hard
771: * to read identity files and other non-world-readable files from the
772: * user's home directory if it happens to be on a NFS volume where
773: * root is mapped to nobody.
774: */
1.225 dtucker 775: if (original_effective_uid == 0) {
776: PRIV_START;
777: permanently_set_uid(pw);
778: }
1.31 markus 779:
1.33 markus 780: /*
781: * Now that we are back to our own permissions, create ~/.ssh
1.254 djm 782: * directory if it doesn't already exist.
1.33 markus 783: */
1.326 dtucker 784: r = snprintf(buf, sizeof buf, "%s%s%s", pw->pw_dir,
1.316 djm 785: strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR);
1.326 dtucker 786: if (r > 0 && (size_t)r < sizeof(buf) && stat(buf, &st) < 0)
1.57 djm 787: if (mkdir(buf, 0700) < 0)
1.31 markus 788: error("Could not create directory '%.200s'.", buf);
789:
1.104 markus 790: /* load options.identity_files */
791: load_public_identity_files();
792:
793: /* Expand ~ in known host file names. */
794: /* XXX mem-leaks: */
1.72 markus 795: options.system_hostfile =
796: tilde_expand_filename(options.system_hostfile, original_real_uid);
797: options.user_hostfile =
798: tilde_expand_filename(options.user_hostfile, original_real_uid);
799: options.system_hostfile2 =
800: tilde_expand_filename(options.system_hostfile2, original_real_uid);
801: options.user_hostfile2 =
802: tilde_expand_filename(options.user_hostfile2, original_real_uid);
1.149 markus 803:
804: signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
1.31 markus 805:
1.316 djm 806: /* Log into the remote system. Never returns if the login fails. */
1.303 djm 807: ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr,
808: pw, timeout_ms);
1.31 markus 809:
1.112 markus 810: /* We no longer need the private host keys. Clear them now. */
811: if (sensitive_data.nkeys != 0) {
812: for (i = 0; i < sensitive_data.nkeys; i++) {
813: if (sensitive_data.keys[i] != NULL) {
814: /* Destroys contents safely */
815: debug3("clear hostkey %d", i);
816: key_free(sensitive_data.keys[i]);
817: sensitive_data.keys[i] = NULL;
818: }
819: }
820: xfree(sensitive_data.keys);
1.134 markus 821: }
822: for (i = 0; i < options.num_identity_files; i++) {
823: if (options.identity_files[i]) {
824: xfree(options.identity_files[i]);
825: options.identity_files[i] = NULL;
826: }
827: if (options.identity_keys[i]) {
828: key_free(options.identity_keys[i]);
829: options.identity_keys[i] = NULL;
830: }
1.112 markus 831: }
1.31 markus 832:
1.45 markus 833: exit_status = compat20 ? ssh_session2() : ssh_session();
834: packet_close();
1.186 djm 835:
1.312 djm 836: if (options.control_path != NULL && muxserver_sock != -1)
1.214 djm 837: unlink(options.control_path);
838:
1.186 djm 839: /*
1.203 djm 840: * Send SIGHUP to proxy command if used. We don't wait() in
1.186 djm 841: * case it hangs and instead rely on init to reap the child
842: */
843: if (proxy_command_pid > 1)
844: kill(proxy_command_pid, SIGHUP);
845:
1.45 markus 846: return exit_status;
847: }
848:
1.315 djm 849: /* Callback for remote forward global requests */
850: static void
851: ssh_confirm_remote_forward(int type, u_int32_t seq, void *ctxt)
852: {
853: Forward *rfwd = (Forward *)ctxt;
854:
1.324 djm 855: /* XXX verbose() on failure? */
1.315 djm 856: debug("remote forward %s for: listen %d, connect %s:%d",
857: type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
858: rfwd->listen_port, rfwd->connect_host, rfwd->connect_port);
1.324 djm 859: if (type == SSH2_MSG_REQUEST_SUCCESS && rfwd->listen_port == 0) {
860: logit("Allocated port %u for remote forward to %s:%d",
861: packet_get_int(),
862: rfwd->connect_host, rfwd->connect_port);
863: }
864:
1.315 djm 865: if (type == SSH2_MSG_REQUEST_FAILURE) {
866: if (options.exit_on_forward_failure)
867: fatal("Error: remote port forwarding failed for "
868: "listen port %d", rfwd->listen_port);
869: else
870: logit("Warning: remote port forwarding failed for "
871: "listen port %d", rfwd->listen_port);
872: }
1.318 djm 873: if (++remote_forward_confirms_received == options.num_remote_forwards) {
1.315 djm 874: debug("All remote forwarding requests processed");
1.318 djm 875: if (fork_after_authentication_flag) {
876: fork_after_authentication_flag = 0;
877: if (daemon(1, 1) < 0)
878: fatal("daemon() failed: %.200s",
879: strerror(errno));
880: }
881: }
1.315 djm 882: }
883:
1.126 itojun 884: static void
1.331 dtucker 885: client_cleanup_stdio_fwd(int id, void *arg)
886: {
887: debug("stdio forwarding: done");
888: cleanup_exit(0);
889: }
890:
891: static int
892: client_setup_stdio_fwd(const char *host_to_connect, u_short port_to_connect)
893: {
894: Channel *c;
1.332 djm 895: int in, out;
1.331 dtucker 896:
897: debug3("client_setup_stdio_fwd %s:%d", host_to_connect,
898: port_to_connect);
1.332 djm 899:
900: in = dup(STDIN_FILENO);
901: out = dup(STDOUT_FILENO);
902: if (in < 0 || out < 0)
903: fatal("channel_connect_stdio_fwd: dup() in/out failed");
904:
905: if ((c = channel_connect_stdio_fwd(host_to_connect, port_to_connect,
906: in, out)) == NULL)
1.331 dtucker 907: return 0;
908: channel_register_cleanup(c->self, client_cleanup_stdio_fwd, 0);
909: return 1;
910: }
911:
912: static void
1.70 markus 913: ssh_init_forwarding(void)
914: {
1.86 markus 915: int success = 0;
1.70 markus 916: int i;
1.331 dtucker 917:
918: if (stdio_forward_host != NULL) {
919: if (!compat20) {
920: fatal("stdio forwarding require Protocol 2");
921: }
922: if (!client_setup_stdio_fwd(stdio_forward_host,
923: stdio_forward_port))
924: fatal("Failed to connect in stdio forward mode.");
925: }
1.86 markus 926:
1.70 markus 927: /* Initiate local TCP/IP port forwardings. */
928: for (i = 0; i < options.num_local_forwards; i++) {
1.232 djm 929: debug("Local connections to %.200s:%d forwarded to remote "
930: "address %.200s:%d",
1.234 deraadt 931: (options.local_forwards[i].listen_host == NULL) ?
932: (options.gateway_ports ? "*" : "LOCALHOST") :
1.232 djm 933: options.local_forwards[i].listen_host,
934: options.local_forwards[i].listen_port,
935: options.local_forwards[i].connect_host,
936: options.local_forwards[i].connect_port);
1.158 markus 937: success += channel_setup_local_fwd_listener(
1.232 djm 938: options.local_forwards[i].listen_host,
939: options.local_forwards[i].listen_port,
940: options.local_forwards[i].connect_host,
941: options.local_forwards[i].connect_port,
1.70 markus 942: options.gateway_ports);
943: }
1.283 markus 944: if (i > 0 && success != i && options.exit_on_forward_failure)
945: fatal("Could not request local forwarding.");
1.86 markus 946: if (i > 0 && success == 0)
947: error("Could not request local forwarding.");
1.70 markus 948:
949: /* Initiate remote TCP/IP port forwardings. */
950: for (i = 0; i < options.num_remote_forwards; i++) {
1.232 djm 951: debug("Remote connections from %.200s:%d forwarded to "
952: "local address %.200s:%d",
1.248 djm 953: (options.remote_forwards[i].listen_host == NULL) ?
1.253 djm 954: "LOCALHOST" : options.remote_forwards[i].listen_host,
1.232 djm 955: options.remote_forwards[i].listen_port,
956: options.remote_forwards[i].connect_host,
957: options.remote_forwards[i].connect_port);
1.283 markus 958: if (channel_request_remote_forwarding(
1.232 djm 959: options.remote_forwards[i].listen_host,
960: options.remote_forwards[i].listen_port,
961: options.remote_forwards[i].connect_host,
1.283 markus 962: options.remote_forwards[i].connect_port) < 0) {
963: if (options.exit_on_forward_failure)
964: fatal("Could not request remote forwarding.");
965: else
966: logit("Warning: Could not request remote "
967: "forwarding.");
968: }
1.315 djm 969: client_register_global_confirm(ssh_confirm_remote_forward,
970: &options.remote_forwards[i]);
1.70 markus 971: }
1.301 djm 972:
973: /* Initiate tunnel forwarding. */
974: if (options.tun_open != SSH_TUNMODE_NO) {
975: if (client_request_tun_fwd(options.tun_open,
976: options.tun_local, options.tun_remote) == -1) {
977: if (options.exit_on_forward_failure)
978: fatal("Could not request tunnel forwarding.");
979: else
980: error("Could not request tunnel forwarding.");
981: }
982: }
1.70 markus 983: }
984:
1.126 itojun 985: static void
1.70 markus 986: check_agent_present(void)
987: {
988: if (options.forward_agent) {
1.254 djm 989: /* Clear agent forwarding if we don't have an agent. */
1.185 stevesk 990: if (!ssh_agent_present())
1.70 markus 991: options.forward_agent = 0;
992: }
993: }
994:
1.126 itojun 995: static int
1.45 markus 996: ssh_session(void)
997: {
998: int type;
999: int interactive = 0;
1000: int have_tty = 0;
1001: struct winsize ws;
1002: char *cp;
1.243 djm 1003: const char *display;
1.45 markus 1004:
1.31 markus 1005: /* Enable compression if requested. */
1006: if (options.compression) {
1.316 djm 1007: debug("Requesting compression at level %d.",
1008: options.compression_level);
1.31 markus 1009:
1.316 djm 1010: if (options.compression_level < 1 ||
1011: options.compression_level > 9)
1012: fatal("Compression level must be from 1 (fast) to "
1013: "9 (slow, best).");
1.31 markus 1014:
1015: /* Send the request. */
1016: packet_start(SSH_CMSG_REQUEST_COMPRESSION);
1017: packet_put_int(options.compression_level);
1018: packet_send();
1019: packet_write_wait();
1.156 markus 1020: type = packet_read();
1.31 markus 1021: if (type == SSH_SMSG_SUCCESS)
1022: packet_start_compression(options.compression_level);
1023: else if (type == SSH_SMSG_FAILURE)
1.191 itojun 1024: logit("Warning: Remote host refused compression.");
1.31 markus 1025: else
1.316 djm 1026: packet_disconnect("Protocol error waiting for "
1027: "compression response.");
1.31 markus 1028: }
1029: /* Allocate a pseudo tty if appropriate. */
1030: if (tty_flag) {
1031: debug("Requesting pty.");
1032:
1033: /* Start the packet. */
1034: packet_start(SSH_CMSG_REQUEST_PTY);
1035:
1036: /* Store TERM in the packet. There is no limit on the
1037: length of the string. */
1038: cp = getenv("TERM");
1039: if (!cp)
1040: cp = "";
1.124 markus 1041: packet_put_cstring(cp);
1.31 markus 1042:
1043: /* Store window size in the packet. */
1044: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
1045: memset(&ws, 0, sizeof(ws));
1.269 deraadt 1046: packet_put_int((u_int)ws.ws_row);
1047: packet_put_int((u_int)ws.ws_col);
1048: packet_put_int((u_int)ws.ws_xpixel);
1049: packet_put_int((u_int)ws.ws_ypixel);
1.31 markus 1050:
1051: /* Store tty modes in the packet. */
1.115 stevesk 1052: tty_make_modes(fileno(stdin), NULL);
1.31 markus 1053:
1054: /* Send the packet, and wait for it to leave. */
1055: packet_send();
1056: packet_write_wait();
1057:
1058: /* Read response from the server. */
1.156 markus 1059: type = packet_read();
1.43 markus 1060: if (type == SSH_SMSG_SUCCESS) {
1.31 markus 1061: interactive = 1;
1.45 markus 1062: have_tty = 1;
1.43 markus 1063: } else if (type == SSH_SMSG_FAILURE)
1.316 djm 1064: logit("Warning: Remote host failed or refused to "
1065: "allocate a pseudo tty.");
1.31 markus 1066: else
1.316 djm 1067: packet_disconnect("Protocol error waiting for pty "
1068: "request response.");
1.31 markus 1069: }
1070: /* Request X11 forwarding if enabled and DISPLAY is set. */
1.243 djm 1071: display = getenv("DISPLAY");
1072: if (options.forward_x11 && display != NULL) {
1.150 stevesk 1073: char *proto, *data;
1.50 markus 1074: /* Get reasonable local authentication information. */
1.243 djm 1075: client_x11_get_proto(display, options.xauth_location,
1076: options.forward_x11_trusted, &proto, &data);
1.50 markus 1077: /* Request forwarding with authentication spoofing. */
1.316 djm 1078: debug("Requesting X11 forwarding with authentication "
1079: "spoofing.");
1.243 djm 1080: x11_request_forwarding_with_spoofing(0, display, proto, data);
1.31 markus 1081:
1082: /* Read response from the server. */
1.156 markus 1083: type = packet_read();
1.31 markus 1084: if (type == SSH_SMSG_SUCCESS) {
1085: interactive = 1;
1.50 markus 1086: } else if (type == SSH_SMSG_FAILURE) {
1.191 itojun 1087: logit("Warning: Remote host denied X11 forwarding.");
1.50 markus 1088: } else {
1.316 djm 1089: packet_disconnect("Protocol error waiting for X11 "
1090: "forwarding");
1.50 markus 1091: }
1.31 markus 1092: }
1093: /* Tell the packet module whether this is an interactive session. */
1.80 markus 1094: packet_set_interactive(interactive);
1.31 markus 1095:
1096: /* Request authentication agent forwarding if appropriate. */
1.70 markus 1097: check_agent_present();
1098:
1.31 markus 1099: if (options.forward_agent) {
1100: debug("Requesting authentication agent forwarding.");
1101: auth_request_forwarding();
1102:
1103: /* Read response from the server. */
1.156 markus 1104: type = packet_read();
1.155 markus 1105: packet_check_eom();
1.31 markus 1106: if (type != SSH_SMSG_SUCCESS)
1.191 itojun 1107: logit("Warning: Remote host denied authentication agent forwarding.");
1.31 markus 1108: }
1109:
1.70 markus 1110: /* Initiate port forwardings. */
1111: ssh_init_forwarding();
1.305 dtucker 1112:
1113: /* Execute a local command */
1114: if (options.local_command != NULL &&
1115: options.permit_local_command)
1116: ssh_local_cmd(options.local_command);
1.34 markus 1117:
1.318 djm 1118: /*
1119: * If requested and we are not interested in replies to remote
1120: * forwarding requests, then let ssh continue in the background.
1121: */
1122: if (fork_after_authentication_flag &&
1123: (!options.exit_on_forward_failure ||
1124: options.num_remote_forwards == 0)) {
1125: fork_after_authentication_flag = 0;
1.34 markus 1126: if (daemon(1, 1) < 0)
1127: fatal("daemon() failed: %.200s", strerror(errno));
1.318 djm 1128: }
1.31 markus 1129:
1.33 markus 1130: /*
1131: * If a command was specified on the command line, execute the
1132: * command now. Otherwise request the server to start a shell.
1133: */
1.31 markus 1134: if (buffer_len(&command) > 0) {
1135: int len = buffer_len(&command);
1136: if (len > 900)
1137: len = 900;
1.316 djm 1138: debug("Sending command: %.*s", len,
1139: (u_char *)buffer_ptr(&command));
1.31 markus 1140: packet_start(SSH_CMSG_EXEC_CMD);
1141: packet_put_string(buffer_ptr(&command), buffer_len(&command));
1142: packet_send();
1143: packet_write_wait();
1144: } else {
1145: debug("Requesting shell.");
1146: packet_start(SSH_CMSG_EXEC_SHELL);
1147: packet_send();
1148: packet_write_wait();
1149: }
1150:
1151: /* Enter the interactive session. */
1.119 stevesk 1152: return client_loop(have_tty, tty_flag ?
1153: options.escape_char : SSH_ESCAPECHAR_NONE, 0);
1.89 markus 1154: }
1155:
1.214 djm 1156: /* request pty/x11/agent/tcpfwd/shell for channel */
1157: static void
1158: ssh_session2_setup(int id, void *arg)
1159: {
1.215 djm 1160: extern char **environ;
1.243 djm 1161: const char *display;
1162: int interactive = tty_flag;
1.215 djm 1163:
1.248 djm 1164: display = getenv("DISPLAY");
1.243 djm 1165: if (options.forward_x11 && display != NULL) {
1.150 stevesk 1166: char *proto, *data;
1.50 markus 1167: /* Get reasonable local authentication information. */
1.243 djm 1168: client_x11_get_proto(display, options.xauth_location,
1169: options.forward_x11_trusted, &proto, &data);
1.50 markus 1170: /* Request forwarding with authentication spoofing. */
1.316 djm 1171: debug("Requesting X11 forwarding with authentication "
1172: "spoofing.");
1.243 djm 1173: x11_request_forwarding_with_spoofing(id, display, proto, data);
1.80 markus 1174: interactive = 1;
1.50 markus 1175: /* XXX wait for reply */
1176: }
1177:
1.70 markus 1178: check_agent_present();
1179: if (options.forward_agent) {
1180: debug("Requesting authentication agent forwarding.");
1181: channel_request_start(id, "auth-agent-req@openssh.com", 0);
1182: packet_send();
1.212 djm 1183: }
1184:
1.214 djm 1185: client_session2_setup(id, tty_flag, subsystem_flag, getenv("TERM"),
1.311 djm 1186: NULL, fileno(stdin), &command, environ);
1.90 markus 1187:
1.80 markus 1188: packet_set_interactive(interactive);
1.45 markus 1189: }
1190:
1.143 markus 1191: /* open new channel for a session */
1.126 itojun 1192: static int
1.143 markus 1193: ssh_session2_open(void)
1.45 markus 1194: {
1.118 markus 1195: Channel *c;
1196: int window, packetmax, in, out, err;
1.60 markus 1197:
1.62 markus 1198: if (stdin_null_flag) {
1.93 itojun 1199: in = open(_PATH_DEVNULL, O_RDONLY);
1.62 markus 1200: } else {
1201: in = dup(STDIN_FILENO);
1202: }
1.60 markus 1203: out = dup(STDOUT_FILENO);
1204: err = dup(STDERR_FILENO);
1.45 markus 1205:
1206: if (in < 0 || out < 0 || err < 0)
1.62 markus 1207: fatal("dup() in/out/err failed");
1.45 markus 1208:
1.69 markus 1209: /* enable nonblocking unless tty */
1210: if (!isatty(in))
1211: set_nonblock(in);
1212: if (!isatty(out))
1213: set_nonblock(out);
1214: if (!isatty(err))
1215: set_nonblock(err);
1216:
1.65 markus 1217: window = CHAN_SES_WINDOW_DEFAULT;
1218: packetmax = CHAN_SES_PACKET_DEFAULT;
1.164 markus 1219: if (tty_flag) {
1220: window >>= 1;
1221: packetmax >>= 1;
1.45 markus 1222: }
1.118 markus 1223: c = channel_new(
1.45 markus 1224: "session", SSH_CHANNEL_OPENING, in, out, err,
1.65 markus 1225: window, packetmax, CHAN_EXTENDED_WRITE,
1.192 markus 1226: "client-session", /*nonblock*/0);
1.45 markus 1227:
1.143 markus 1228: debug3("ssh_session2_open: channel_new: %d", c->self);
1.106 markus 1229:
1.122 markus 1230: channel_send_open(c->self);
1.143 markus 1231: if (!no_shell_flag)
1.310 djm 1232: channel_register_open_confirm(c->self,
1233: ssh_session2_setup, NULL);
1.106 markus 1234:
1.118 markus 1235: return c->self;
1.106 markus 1236: }
1237:
1.126 itojun 1238: static int
1.106 markus 1239: ssh_session2(void)
1240: {
1.143 markus 1241: int id = -1;
1.106 markus 1242:
1243: /* XXX should be pre-session */
1244: ssh_init_forwarding();
1245:
1.143 markus 1246: if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN))
1247: id = ssh_session2_open();
1.314 djm 1248:
1249: /* If we don't expect to open a new session, then disallow it */
1.319 markus 1250: if (options.control_master == SSHCTL_MASTER_NO &&
1251: (datafellows & SSH_NEW_OPENSSH)) {
1.314 djm 1252: debug("Requesting no-more-sessions@openssh.com");
1253: packet_start(SSH2_MSG_GLOBAL_REQUEST);
1254: packet_put_cstring("no-more-sessions@openssh.com");
1255: packet_put_char(0);
1256: packet_send();
1257: }
1.255 reyk 1258:
1259: /* Execute a local command */
1260: if (options.local_command != NULL &&
1261: options.permit_local_command)
1262: ssh_local_cmd(options.local_command);
1.301 djm 1263:
1264: /* Start listening for multiplex clients */
1.312 djm 1265: muxserver_listen();
1.106 markus 1266:
1267: /* If requested, let ssh continue in the background. */
1.318 djm 1268: if (fork_after_authentication_flag) {
1269: fork_after_authentication_flag = 0;
1.106 markus 1270: if (daemon(1, 1) < 0)
1271: fatal("daemon() failed: %.200s", strerror(errno));
1.318 djm 1272: }
1.327 andreas 1273:
1274: if (options.use_roaming)
1275: request_roaming();
1.31 markus 1276:
1.119 stevesk 1277: return client_loop(tty_flag, tty_flag ?
1278: options.escape_char : SSH_ESCAPECHAR_NONE, id);
1.72 markus 1279: }
1280:
1.126 itojun 1281: static void
1.104 markus 1282: load_public_identity_files(void)
1283: {
1.275 djm 1284: char *filename, *cp, thishost[NI_MAXHOST];
1.306 deraadt 1285: char *pwdir = NULL, *pwname = NULL;
1.167 markus 1286: int i = 0;
1.104 markus 1287: Key *public;
1.275 djm 1288: struct passwd *pw;
1.333 ! markus 1289: #ifdef ENABLE_PKCS11
1.167 markus 1290: Key **keys;
1.333 ! markus 1291: int nkeys;
1.104 markus 1292:
1.333 ! markus 1293: if (options.pkcs11_provider != NULL &&
1.167 markus 1294: options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
1.333 ! markus 1295: (pkcs11_init(!options.batch_mode) == 0) &&
! 1296: (nkeys = pkcs11_add_provider(options.pkcs11_provider, NULL,
! 1297: &keys)) > 0) {
1.167 markus 1298: int count = 0;
1.333 ! markus 1299: for (i = 0; i < nkeys; i++) {
1.167 markus 1300: count++;
1.316 djm 1301: memmove(&options.identity_files[1],
1302: &options.identity_files[0],
1.167 markus 1303: sizeof(char *) * (SSH_MAX_IDENTITY_FILES - 1));
1.316 djm 1304: memmove(&options.identity_keys[1],
1305: &options.identity_keys[0],
1.167 markus 1306: sizeof(Key *) * (SSH_MAX_IDENTITY_FILES - 1));
1307: options.num_identity_files++;
1308: options.identity_keys[0] = keys[i];
1.333 ! markus 1309: options.identity_files[0] =
! 1310: xstrdup(options.pkcs11_provider); /* XXX */
1.167 markus 1311: }
1.168 markus 1312: if (options.num_identity_files > SSH_MAX_IDENTITY_FILES)
1313: options.num_identity_files = SSH_MAX_IDENTITY_FILES;
1.167 markus 1314: i = count;
1315: xfree(keys);
1.333 ! markus 1316: /* XXX leaks some keys */
1.127 markus 1317: }
1.333 ! markus 1318: #endif /* ENABLE_PKCS11 */
1.275 djm 1319: if ((pw = getpwuid(original_real_uid)) == NULL)
1320: fatal("load_public_identity_files: getpwuid failed");
1.307 dtucker 1321: pwname = xstrdup(pw->pw_name);
1322: pwdir = xstrdup(pw->pw_dir);
1.275 djm 1323: if (gethostname(thishost, sizeof(thishost)) == -1)
1324: fatal("load_public_identity_files: gethostname: %s",
1325: strerror(errno));
1.131 millert 1326: for (; i < options.num_identity_files; i++) {
1.275 djm 1327: cp = tilde_expand_filename(options.identity_files[i],
1.131 millert 1328: original_real_uid);
1.306 deraadt 1329: filename = percent_expand(cp, "d", pwdir,
1330: "u", pwname, "l", thishost, "h", host,
1.275 djm 1331: "r", options.user, (char *)NULL);
1332: xfree(cp);
1.131 millert 1333: public = key_load_public(filename, NULL);
1334: debug("identity file %s type %d", filename,
1335: public ? public->type : -1);
1336: xfree(options.identity_files[i]);
1337: options.identity_files[i] = filename;
1338: options.identity_keys[i] = public;
1339: }
1.306 deraadt 1340: bzero(pwname, strlen(pwname));
1.307 dtucker 1341: xfree(pwname);
1.306 deraadt 1342: bzero(pwdir, strlen(pwdir));
1.307 dtucker 1343: xfree(pwdir);
1.214 djm 1344: }
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