Annotation of src/usr.bin/ssh/ssh.c, Revision 1.341
1.341 ! djm 1: /* $OpenBSD: ssh.c,v 1.340 2010/06/25 23:15:36 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"
1.341 ! djm 73: #include "canohost.h"
1.84 markus 74: #include "compat.h"
75: #include "cipher.h"
1.1 deraadt 76: #include "packet.h"
77: #include "buffer.h"
1.123 markus 78: #include "channels.h"
1.49 markus 79: #include "key.h"
1.58 markus 80: #include "authfd.h"
1.49 markus 81: #include "authfile.h"
1.83 markus 82: #include "pathnames.h"
1.214 djm 83: #include "dispatch.h"
1.81 markus 84: #include "clientloop.h"
1.84 markus 85: #include "log.h"
86: #include "readconf.h"
87: #include "sshconnect.h"
88: #include "misc.h"
1.95 markus 89: #include "kex.h"
90: #include "mac.h"
1.213 deraadt 91: #include "sshpty.h"
1.212 djm 92: #include "match.h"
1.214 djm 93: #include "msg.h"
1.225 dtucker 94: #include "uidswap.h"
1.327 andreas 95: #include "roaming.h"
1.278 stevesk 96: #include "version.h"
1.49 markus 97:
1.333 markus 98: #ifdef ENABLE_PKCS11
99: #include "ssh-pkcs11.h"
1.137 jakob 100: #endif
1.127 markus 101:
1.49 markus 102: extern char *__progname;
1.1 deraadt 103:
1.316 djm 104: /* Flag indicating whether debug mode is on. May be set on the command line. */
1.1 deraadt 105: int debug_flag = 0;
106:
1.46 markus 107: /* Flag indicating whether a tty should be allocated */
1.1 deraadt 108: int tty_flag = 0;
1.79 markus 109: int no_tty_flag = 0;
110: int force_tty_flag = 0;
1.1 deraadt 111:
1.45 markus 112: /* don't exec a shell */
113: int no_shell_flag = 0;
114:
1.33 markus 115: /*
116: * Flag indicating that nothing should be read from stdin. This can be set
117: * on the command line.
118: */
1.1 deraadt 119: int stdin_null_flag = 0;
120:
1.33 markus 121: /*
122: * Flag indicating that ssh should fork after authentication. This is useful
1.172 deraadt 123: * so that the passphrase can be entered manually, and then ssh goes to the
1.33 markus 124: * background.
125: */
1.1 deraadt 126: int fork_after_authentication_flag = 0;
127:
1.331 dtucker 128: /* forward stdio to remote host and port */
129: char *stdio_forward_host = NULL;
130: int stdio_forward_port = 0;
131:
1.33 markus 132: /*
133: * General data structure for command line options and options configurable
134: * in configuration files. See readconf.h.
135: */
1.1 deraadt 136: Options options;
137:
1.139 markus 138: /* optional user configfile */
139: char *config = NULL;
140:
1.33 markus 141: /*
142: * Name of the host we are connecting to. This is the name given on the
143: * command line, or the HostName specified for the user-supplied name in a
144: * configuration file.
145: */
1.1 deraadt 146: char *host;
147:
1.22 provos 148: /* socket address the host resolves to */
1.37 markus 149: struct sockaddr_storage hostaddr;
1.1 deraadt 150:
1.112 markus 151: /* Private host keys. */
1.173 markus 152: Sensitive sensitive_data;
1.1 deraadt 153:
1.10 dugsong 154: /* Original real UID. */
155: uid_t original_real_uid;
1.177 markus 156: uid_t original_effective_uid;
1.1 deraadt 157:
1.45 markus 158: /* command to be executed */
159: Buffer command;
160:
1.85 djm 161: /* Should we execute a command or invoke a subsystem? */
162: int subsystem_flag = 0;
163:
1.170 markus 164: /* # of replies received for global requests */
1.315 djm 165: static int remote_forward_confirms_received = 0;
1.170 markus 166:
1.186 djm 167: /* pid of proxycommand child process */
168: pid_t proxy_command_pid = 0;
1.313 djm 169:
170: /* mux.c */
171: extern int muxserver_sock;
172: extern u_int muxclient_command;
173:
1.186 djm 174:
1.1 deraadt 175: /* Prints a help message to the user. This function never returns. */
176:
1.126 itojun 177: static void
1.93 itojun 178: usage(void)
1.1 deraadt 179: {
1.208 markus 180: fprintf(stderr,
1.321 jmc 181: "usage: ssh [-1246AaCfgKkMNnqsTtVvXxYy] [-b bind_address] [-c cipher_spec]\n"
1.251 jmc 182: " [-D [bind_address:]port] [-e escape_char] [-F configfile]\n"
1.334 jmc 183: " [-I pkcs11] [-i identity_file]\n"
184: " [-L [bind_address:]port:host:hostport]\n"
1.232 djm 185: " [-l login_name] [-m mac_spec] [-O ctl_cmd] [-o option] [-p port]\n"
1.233 jmc 186: " [-R [bind_address:]port:host:hostport] [-S ctl_path]\n"
1.331 dtucker 187: " [-W host:port] [-w local_tun[:remote_tun]]\n"
188: " [user@]hostname [command]\n"
1.208 markus 189: );
1.257 dtucker 190: exit(255);
1.1 deraadt 191: }
192:
1.126 itojun 193: static int ssh_session(void);
194: static int ssh_session2(void);
195: static void load_public_identity_files(void);
1.312 djm 196:
197: /* from muxclient.c */
198: void muxclient(const char *);
199: void muxserver_listen(void);
1.45 markus 200:
1.32 deraadt 201: /*
202: * Main program for the ssh client.
203: */
1.2 provos 204: int
205: main(int ac, char **av)
1.1 deraadt 206: {
1.326 dtucker 207: int i, r, opt, exit_status, use_syslog;
208: char *p, *cp, *line, *argv0, buf[MAXPATHLEN];
1.31 markus 209: struct stat st;
1.98 markus 210: struct passwd *pw;
1.303 djm 211: int dummy, timeout_ms;
1.144 stevesk 212: extern int optind, optreset;
213: extern char *optarg;
1.244 djm 214: struct servent *sp;
1.232 djm 215: Forward fwd;
1.250 djm 216:
217: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
218: sanitise_stdfd();
1.31 markus 219:
1.33 markus 220: /*
221: * Save the original real uid. It will be needed later (uid-swapping
222: * may clobber the real uid).
223: */
1.31 markus 224: original_real_uid = getuid();
225: original_effective_uid = geteuid();
226:
1.184 stevesk 227: /*
228: * Use uid-swapping to give up root privileges for the duration of
229: * option processing. We will re-instantiate the rights when we are
230: * ready to create the privileged port, and will permanently drop
231: * them when the port has been created (actually, when the connection
232: * has been made, as we may need to create the port several times).
233: */
234: PRIV_END;
235:
1.31 markus 236: /* If we are installed setuid root be careful to not drop core. */
237: if (original_real_uid != original_effective_uid) {
238: struct rlimit rlim;
239: rlim.rlim_cur = rlim.rlim_max = 0;
240: if (setrlimit(RLIMIT_CORE, &rlim) < 0)
241: fatal("setrlimit failed: %.100s", strerror(errno));
1.1 deraadt 242: }
1.107 markus 243: /* Get user data. */
244: pw = getpwuid(original_real_uid);
245: if (!pw) {
1.191 itojun 246: logit("You don't exist, go away!");
1.257 dtucker 247: exit(255);
1.107 markus 248: }
249: /* Take a copy of the returned structure. */
250: pw = pwcopy(pw);
1.31 markus 251:
1.33 markus 252: /*
253: * Set our umask to something reasonable, as some files are created
254: * with the default umask. This will make them world-readable but
255: * writable only by the owner, which is ok for all files for which we
256: * don't set the modes explicitly.
257: */
1.31 markus 258: umask(022);
259:
1.316 djm 260: /*
261: * Initialize option structure to indicate that no values have been
262: * set.
263: */
1.31 markus 264: initialize_options(&options);
265:
266: /* Parse command-line arguments. */
267: host = NULL;
1.320 djm 268: use_syslog = 0;
1.325 markus 269: argv0 = av[0];
1.31 markus 270:
1.266 djm 271: again:
1.316 djm 272: while ((opt = getopt(ac, av, "1246ab:c:e:fgi:kl:m:no:p:qstvx"
1.331 dtucker 273: "ACD:F:I:KL:MNO:PR:S:TVw:W:XYy")) != -1) {
1.31 markus 274: switch (opt) {
1.91 jakob 275: case '1':
276: options.protocol = SSH_PROTO_1;
277: break;
1.47 markus 278: case '2':
279: options.protocol = SSH_PROTO_2;
280: break;
1.37 markus 281: case '4':
1.196 djm 282: options.address_family = AF_INET;
1.37 markus 283: break;
284: case '6':
1.196 djm 285: options.address_family = AF_INET6;
1.37 markus 286: break;
1.31 markus 287: case 'n':
288: stdin_null_flag = 1;
289: break;
290: case 'f':
291: fork_after_authentication_flag = 1;
292: stdin_null_flag = 1;
293: break;
294: case 'x':
295: options.forward_x11 = 0;
296: break;
297: case 'X':
298: options.forward_x11 = 1;
299: break;
1.320 djm 300: case 'y':
301: use_syslog = 1;
302: break;
1.202 markus 303: case 'Y':
304: options.forward_x11 = 1;
305: options.forward_x11_trusted = 1;
306: break;
1.31 markus 307: case 'g':
308: options.gateway_ports = 1;
309: break;
1.229 djm 310: case 'O':
1.332 djm 311: if (stdio_forward_host != NULL)
312: fatal("Cannot specify multiplexing "
313: "command with -W");
314: else if (muxclient_command != 0)
315: fatal("Multiplexing command already specified");
1.229 djm 316: if (strcmp(optarg, "check") == 0)
1.312 djm 317: muxclient_command = SSHMUX_COMMAND_ALIVE_CHECK;
1.338 markus 318: else if (strcmp(optarg, "forward") == 0)
319: muxclient_command = SSHMUX_COMMAND_FORWARD;
1.229 djm 320: else if (strcmp(optarg, "exit") == 0)
1.312 djm 321: muxclient_command = SSHMUX_COMMAND_TERMINATE;
1.229 djm 322: else
323: fatal("Invalid multiplex command.");
324: break;
1.183 stevesk 325: case 'P': /* deprecated */
1.31 markus 326: options.use_privileged_port = 0;
327: break;
328: case 'a':
329: options.forward_agent = 0;
1.53 markus 330: break;
331: case 'A':
332: options.forward_agent = 1;
1.31 markus 333: break;
334: case 'k':
1.204 dtucker 335: options.gss_deleg_creds = 0;
1.297 djm 336: break;
337: case 'K':
338: options.gss_authentication = 1;
339: options.gss_deleg_creds = 1;
1.31 markus 340: break;
341: case 'i':
342: if (stat(optarg, &st) < 0) {
1.128 fgsch 343: fprintf(stderr, "Warning: Identity file %s "
1.231 otto 344: "not accessible: %s.\n", optarg,
345: strerror(errno));
1.31 markus 346: break;
347: }
1.128 fgsch 348: if (options.num_identity_files >=
349: SSH_MAX_IDENTITY_FILES)
350: fatal("Too many identity files specified "
351: "(max %d)", SSH_MAX_IDENTITY_FILES);
352: options.identity_files[options.num_identity_files++] =
353: xstrdup(optarg);
1.31 markus 354: break;
1.127 markus 355: case 'I':
1.333 markus 356: #ifdef ENABLE_PKCS11
357: options.pkcs11_provider = xstrdup(optarg);
1.137 jakob 358: #else
1.333 markus 359: fprintf(stderr, "no support for PKCS#11.\n");
1.137 jakob 360: #endif
1.127 markus 361: break;
1.31 markus 362: case 't':
1.79 markus 363: if (tty_flag)
364: force_tty_flag = 1;
1.31 markus 365: tty_flag = 1;
366: break;
367: case 'v':
1.197 markus 368: if (debug_flag == 0) {
1.66 markus 369: debug_flag = 1;
370: options.log_level = SYSLOG_LEVEL_DEBUG1;
1.197 markus 371: } else {
372: if (options.log_level < SYSLOG_LEVEL_DEBUG3)
373: options.log_level++;
1.66 markus 374: break;
1.197 markus 375: }
1.227 deraadt 376: /* FALLTHROUGH */
1.31 markus 377: case 'V':
1.209 markus 378: fprintf(stderr, "%s, %s\n",
379: SSH_VERSION, SSLeay_version(SSLEAY_VERSION));
1.31 markus 380: if (opt == 'V')
381: exit(0);
382: break;
1.255 reyk 383: case 'w':
1.256 reyk 384: if (options.tun_open == -1)
385: options.tun_open = SSH_TUNMODE_DEFAULT;
1.255 reyk 386: options.tun_local = a2tun(optarg, &options.tun_remote);
1.256 reyk 387: if (options.tun_local == SSH_TUNID_ERR) {
1.316 djm 388: fprintf(stderr,
389: "Bad tun device '%s'\n", optarg);
1.257 dtucker 390: exit(255);
1.255 reyk 391: }
392: break;
1.331 dtucker 393: case 'W':
1.332 djm 394: if (stdio_forward_host != NULL)
395: fatal("stdio forward already specified");
396: if (muxclient_command != 0)
397: fatal("Cannot specify stdio forward with -O");
1.331 dtucker 398: if (parse_forward(&fwd, optarg, 1, 0)) {
399: stdio_forward_host = fwd.listen_host;
400: stdio_forward_port = fwd.listen_port;
401: xfree(fwd.connect_host);
402: } else {
403: fprintf(stderr,
404: "Bad stdio forwarding specification '%s'\n",
405: optarg);
406: exit(255);
407: }
408: no_tty_flag = 1;
409: no_shell_flag = 1;
410: options.clear_forwardings = 1;
411: options.exit_on_forward_failure = 1;
412: break;
1.31 markus 413: case 'q':
414: options.log_level = SYSLOG_LEVEL_QUIET;
415: break;
416: case 'e':
417: if (optarg[0] == '^' && optarg[2] == 0 &&
1.128 fgsch 418: (u_char) optarg[1] >= 64 &&
419: (u_char) optarg[1] < 128)
1.78 markus 420: options.escape_char = (u_char) optarg[1] & 31;
1.31 markus 421: else if (strlen(optarg) == 1)
1.78 markus 422: options.escape_char = (u_char) optarg[0];
1.31 markus 423: else if (strcmp(optarg, "none") == 0)
1.119 stevesk 424: options.escape_char = SSH_ESCAPECHAR_NONE;
1.31 markus 425: else {
1.128 fgsch 426: fprintf(stderr, "Bad escape character '%s'.\n",
427: optarg);
1.257 dtucker 428: exit(255);
1.31 markus 429: }
430: break;
431: case 'c':
1.49 markus 432: if (ciphers_valid(optarg)) {
433: /* SSH2 only */
434: options.ciphers = xstrdup(optarg);
1.224 markus 435: options.cipher = SSH_CIPHER_INVALID;
1.49 markus 436: } else {
437: /* SSH1 only */
1.74 markus 438: options.cipher = cipher_number(optarg);
439: if (options.cipher == -1) {
1.128 fgsch 440: fprintf(stderr,
441: "Unknown cipher type '%s'\n",
442: optarg);
1.257 dtucker 443: exit(255);
1.49 markus 444: }
1.128 fgsch 445: if (options.cipher == SSH_CIPHER_3DES)
1.74 markus 446: options.ciphers = "3des-cbc";
1.128 fgsch 447: else if (options.cipher == SSH_CIPHER_BLOWFISH)
1.74 markus 448: options.ciphers = "blowfish-cbc";
1.128 fgsch 449: else
1.74 markus 450: options.ciphers = (char *)-1;
1.95 markus 451: }
452: break;
453: case 'm':
454: if (mac_valid(optarg))
455: options.macs = xstrdup(optarg);
456: else {
1.128 fgsch 457: fprintf(stderr, "Unknown mac type '%s'\n",
458: optarg);
1.257 dtucker 459: exit(255);
1.31 markus 460: }
461: break;
1.214 djm 462: case 'M':
1.242 djm 463: if (options.control_master == SSHCTL_MASTER_YES)
464: options.control_master = SSHCTL_MASTER_ASK;
465: else
466: options.control_master = SSHCTL_MASTER_YES;
1.214 djm 467: break;
1.31 markus 468: case 'p':
1.113 stevesk 469: options.port = a2port(optarg);
1.323 djm 470: if (options.port <= 0) {
1.109 markus 471: fprintf(stderr, "Bad port '%s'\n", optarg);
1.257 dtucker 472: exit(255);
1.109 markus 473: }
1.31 markus 474: break;
475: case 'l':
476: options.user = optarg;
477: break;
1.141 stevesk 478:
479: case 'L':
1.324 djm 480: if (parse_forward(&fwd, optarg, 0, 0))
1.232 djm 481: add_local_forward(&options, &fwd);
482: else {
1.128 fgsch 483: fprintf(stderr,
1.232 djm 484: "Bad local forwarding specification '%s'\n",
1.128 fgsch 485: optarg);
1.257 dtucker 486: exit(255);
1.31 markus 487: }
1.232 djm 488: break;
489:
490: case 'R':
1.324 djm 491: if (parse_forward(&fwd, optarg, 0, 1)) {
1.232 djm 492: add_remote_forward(&options, &fwd);
493: } else {
1.128 fgsch 494: fprintf(stderr,
1.232 djm 495: "Bad remote forwarding specification "
496: "'%s'\n", optarg);
1.257 dtucker 497: exit(255);
1.31 markus 498: }
499: break;
1.108 markus 500:
501: case 'D':
1.324 djm 502: if (parse_forward(&fwd, optarg, 1, 0)) {
1.322 stevesk 503: add_local_forward(&options, &fwd);
1.232 djm 504: } else {
1.322 stevesk 505: fprintf(stderr,
506: "Bad dynamic forwarding specification "
507: "'%s'\n", optarg);
1.257 dtucker 508: exit(255);
1.109 markus 509: }
1.108 markus 510: break;
511:
1.31 markus 512: case 'C':
513: options.compression = 1;
514: break;
1.45 markus 515: case 'N':
516: no_shell_flag = 1;
517: no_tty_flag = 1;
518: break;
519: case 'T':
520: no_tty_flag = 1;
521: break;
1.31 markus 522: case 'o':
523: dummy = 1;
1.205 markus 524: line = xstrdup(optarg);
1.128 fgsch 525: if (process_config_line(&options, host ? host : "",
1.205 markus 526: line, "command-line", 0, &dummy) != 0)
1.257 dtucker 527: exit(255);
1.205 markus 528: xfree(line);
1.31 markus 529: break;
1.85 djm 530: case 's':
531: subsystem_flag = 1;
1.117 markus 532: break;
1.214 djm 533: case 'S':
534: if (options.control_path != NULL)
535: free(options.control_path);
536: options.control_path = xstrdup(optarg);
537: break;
1.117 markus 538: case 'b':
539: options.bind_address = optarg;
1.85 djm 540: break;
1.139 markus 541: case 'F':
542: config = optarg;
543: break;
1.31 markus 544: default:
545: usage();
1.1 deraadt 546: }
1.31 markus 547: }
548:
1.128 fgsch 549: ac -= optind;
550: av += optind;
551:
1.329 guenther 552: if (ac > 0 && !host) {
1.188 markus 553: if (strrchr(*av, '@')) {
1.128 fgsch 554: p = xstrdup(*av);
1.188 markus 555: cp = strrchr(p, '@');
1.128 fgsch 556: if (cp == NULL || cp == p)
557: usage();
558: options.user = p;
559: *cp = '\0';
560: host = ++cp;
561: } else
562: host = *av;
1.189 millert 563: if (ac > 1) {
564: optind = optreset = 1;
1.128 fgsch 565: goto again;
566: }
1.189 millert 567: ac--, av++;
1.128 fgsch 568: }
569:
1.31 markus 570: /* Check that we got a host name. */
571: if (!host)
572: usage();
573:
1.54 markus 574: SSLeay_add_all_algorithms();
1.72 markus 575: ERR_load_crypto_strings();
1.31 markus 576:
577: /* Initialize the command to execute on remote host. */
578: buffer_init(&command);
1.1 deraadt 579:
1.33 markus 580: /*
581: * Save the command to execute on the remote host in a buffer. There
582: * is no limit on the length of the command, except by the maximum
583: * packet size. Also sets the tty flag if there is no command.
584: */
1.128 fgsch 585: if (!ac) {
1.31 markus 586: /* No command specified - execute shell on a tty. */
587: tty_flag = 1;
1.85 djm 588: if (subsystem_flag) {
1.128 fgsch 589: fprintf(stderr,
590: "You must specify a subsystem to invoke.\n");
1.85 djm 591: usage();
592: }
1.31 markus 593: } else {
1.128 fgsch 594: /* A command has been specified. Store it into the buffer. */
595: for (i = 0; i < ac; i++) {
596: if (i)
1.31 markus 597: buffer_append(&command, " ", 1);
598: buffer_append(&command, av[i], strlen(av[i]));
599: }
600: }
601:
602: /* Cannot fork to background if no command. */
1.316 djm 603: if (fork_after_authentication_flag && buffer_len(&command) == 0 &&
604: !no_shell_flag)
605: fatal("Cannot fork into background without a command "
606: "to execute.");
1.31 markus 607:
608: /* Allocate a tty by default if no command specified. */
609: if (buffer_len(&command) == 0)
610: tty_flag = 1;
611:
1.180 deraadt 612: /* Force no tty */
1.336 djm 613: if (no_tty_flag || muxclient_command != 0)
1.75 markus 614: tty_flag = 0;
1.31 markus 615: /* Do not allocate a tty if stdin is not a tty. */
1.236 djm 616: if ((!isatty(fileno(stdin)) || stdin_null_flag) && !force_tty_flag) {
1.31 markus 617: if (tty_flag)
1.316 djm 618: logit("Pseudo-terminal will not be allocated because "
619: "stdin is not a terminal.");
1.31 markus 620: tty_flag = 0;
621: }
1.45 markus 622:
1.101 markus 623: /*
624: * Initialize "log" output. Since we are the client all output
625: * actually goes to stderr.
626: */
1.325 markus 627: log_init(argv0,
1.316 djm 628: options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level,
1.320 djm 629: SYSLOG_FACILITY_USER, !use_syslog);
1.31 markus 630:
1.139 markus 631: /*
632: * Read per-user configuration file. Ignore the system wide config
633: * file if the user specifies a config file on the command line.
634: */
635: if (config != NULL) {
1.211 djm 636: if (!read_config_file(config, host, &options, 0))
1.142 stevesk 637: fatal("Can't open user config file %.100s: "
638: "%.100s", config, strerror(errno));
1.295 stevesk 639: } else {
1.326 dtucker 640: r = snprintf(buf, sizeof buf, "%s/%s", pw->pw_dir,
1.139 markus 641: _PATH_SSH_USER_CONFFILE);
1.326 dtucker 642: if (r > 0 && (size_t)r < sizeof(buf))
643: (void)read_config_file(buf, host, &options, 1);
1.139 markus 644:
1.145 markus 645: /* Read systemwide configuration file after use config. */
1.223 deraadt 646: (void)read_config_file(_PATH_HOST_CONFIG_FILE, host,
1.210 djm 647: &options, 0);
1.139 markus 648: }
1.31 markus 649:
650: /* Fill configuration defaults. */
651: fill_default_options(&options);
652:
1.196 djm 653: channel_set_af(options.address_family);
654:
1.31 markus 655: /* reinit */
1.325 markus 656: log_init(argv0, options.log_level, SYSLOG_FACILITY_USER, !use_syslog);
1.31 markus 657:
658: if (options.user == NULL)
659: options.user = xstrdup(pw->pw_name);
660:
1.317 dtucker 661: /* Get default port if port has not been set. */
662: if (options.port == 0) {
663: sp = getservbyname(SSH_SERVICE_NAME, "tcp");
664: options.port = sp ? ntohs(sp->s_port) : SSH_DEFAULT_PORT;
665: }
666:
667: if (options.local_command != NULL) {
668: char thishost[NI_MAXHOST];
669:
670: if (gethostname(thishost, sizeof(thishost)) == -1)
671: fatal("gethostname: %s", strerror(errno));
672: snprintf(buf, sizeof(buf), "%d", options.port);
673: debug3("expanding LocalCommand: %s", options.local_command);
674: cp = options.local_command;
675: options.local_command = percent_expand(cp, "d", pw->pw_dir,
676: "h", options.hostname? options.hostname : host,
677: "l", thishost, "n", host, "r", options.user, "p", buf,
678: "u", pw->pw_name, (char *)NULL);
679: debug3("expanded LocalCommand: %s", options.local_command);
680: xfree(cp);
681: }
682:
1.31 markus 683: if (options.hostname != NULL)
684: host = options.hostname;
1.195 markus 685:
686: /* force lowercase for hostkey matching */
687: if (options.host_key_alias != NULL) {
688: for (p = options.host_key_alias; *p; p++)
689: if (isupper(*p))
1.271 deraadt 690: *p = (char)tolower(*p);
1.246 djm 691: }
692:
1.190 markus 693: if (options.proxy_command != NULL &&
1.304 dtucker 694: strcmp(options.proxy_command, "none") == 0) {
695: xfree(options.proxy_command);
1.190 markus 696: options.proxy_command = NULL;
1.304 dtucker 697: }
1.245 djm 698: if (options.control_path != NULL &&
1.304 dtucker 699: strcmp(options.control_path, "none") == 0) {
700: xfree(options.control_path);
1.245 djm 701: options.control_path = NULL;
1.304 dtucker 702: }
1.31 markus 703:
1.214 djm 704: if (options.control_path != NULL) {
1.275 djm 705: char thishost[NI_MAXHOST];
1.261 djm 706:
1.275 djm 707: if (gethostname(thishost, sizeof(thishost)) == -1)
1.261 djm 708: fatal("gethostname: %s", strerror(errno));
1.241 djm 709: snprintf(buf, sizeof(buf), "%d", options.port);
710: cp = tilde_expand_filename(options.control_path,
711: original_real_uid);
1.304 dtucker 712: xfree(options.control_path);
1.241 djm 713: options.control_path = percent_expand(cp, "p", buf, "h", host,
1.275 djm 714: "r", options.user, "l", thishost, (char *)NULL);
1.241 djm 715: xfree(cp);
1.214 djm 716: }
1.312 djm 717: if (muxclient_command != 0 && options.control_path == NULL)
1.240 djm 718: fatal("No ControlPath specified for \"-O\" command");
1.242 djm 719: if (options.control_path != NULL)
1.312 djm 720: muxclient(options.control_path);
1.214 djm 721:
1.303 djm 722: timeout_ms = options.connection_timeout * 1000;
723:
1.77 markus 724: /* Open a connection to the remote host. */
1.203 djm 725: if (ssh_connect(host, &hostaddr, options.port,
1.303 djm 726: options.address_family, options.connection_attempts, &timeout_ms,
727: options.tcp_keep_alive,
1.177 markus 728: original_effective_uid == 0 && options.use_privileged_port,
1.179 markus 729: options.proxy_command) != 0)
1.257 dtucker 730: exit(255);
1.31 markus 731:
1.303 djm 732: if (timeout_ms > 0)
733: debug3("timeout: %d ms remain after connect", timeout_ms);
734:
1.33 markus 735: /*
736: * If we successfully made the connection, load the host private key
737: * in case we will need it later for combined rsa-rhosts
738: * authentication. This must be done before releasing extra
739: * privileges, because the file is only readable by root.
1.174 markus 740: * If we cannot access the private keys, load the public keys
741: * instead and try to execute the ssh-keysign helper instead.
1.33 markus 742: */
1.112 markus 743: sensitive_data.nkeys = 0;
744: sensitive_data.keys = NULL;
1.173 markus 745: sensitive_data.external_keysign = 0;
1.178 markus 746: if (options.rhosts_rsa_authentication ||
747: options.hostbased_authentication) {
1.112 markus 748: sensitive_data.nkeys = 3;
1.274 deraadt 749: sensitive_data.keys = xcalloc(sensitive_data.nkeys,
1.180 deraadt 750: sizeof(Key));
1.177 markus 751:
752: PRIV_START;
1.112 markus 753: sensitive_data.keys[0] = key_load_private_type(KEY_RSA1,
1.276 dtucker 754: _PATH_HOST_KEY_FILE, "", NULL, NULL);
1.112 markus 755: sensitive_data.keys[1] = key_load_private_type(KEY_DSA,
1.276 dtucker 756: _PATH_HOST_DSA_KEY_FILE, "", NULL, NULL);
1.112 markus 757: sensitive_data.keys[2] = key_load_private_type(KEY_RSA,
1.276 dtucker 758: _PATH_HOST_RSA_KEY_FILE, "", NULL, NULL);
1.177 markus 759: PRIV_END;
1.173 markus 760:
1.181 markus 761: if (options.hostbased_authentication == 1 &&
762: sensitive_data.keys[0] == NULL &&
1.173 markus 763: sensitive_data.keys[1] == NULL &&
764: sensitive_data.keys[2] == NULL) {
765: sensitive_data.keys[1] = key_load_public(
766: _PATH_HOST_DSA_KEY_FILE, NULL);
767: sensitive_data.keys[2] = key_load_public(
768: _PATH_HOST_RSA_KEY_FILE, NULL);
769: sensitive_data.external_keysign = 1;
770: }
1.31 markus 771: }
1.33 markus 772: /*
773: * Get rid of any extra privileges that we may have. We will no
774: * longer need them. Also, extra privileges could make it very hard
775: * to read identity files and other non-world-readable files from the
776: * user's home directory if it happens to be on a NFS volume where
777: * root is mapped to nobody.
778: */
1.225 dtucker 779: if (original_effective_uid == 0) {
780: PRIV_START;
781: permanently_set_uid(pw);
782: }
1.31 markus 783:
1.33 markus 784: /*
785: * Now that we are back to our own permissions, create ~/.ssh
1.254 djm 786: * directory if it doesn't already exist.
1.33 markus 787: */
1.326 dtucker 788: r = snprintf(buf, sizeof buf, "%s%s%s", pw->pw_dir,
1.316 djm 789: strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR);
1.326 dtucker 790: if (r > 0 && (size_t)r < sizeof(buf) && stat(buf, &st) < 0)
1.57 djm 791: if (mkdir(buf, 0700) < 0)
1.31 markus 792: error("Could not create directory '%.200s'.", buf);
793:
1.104 markus 794: /* load options.identity_files */
795: load_public_identity_files();
796:
797: /* Expand ~ in known host file names. */
798: /* XXX mem-leaks: */
1.72 markus 799: options.system_hostfile =
800: tilde_expand_filename(options.system_hostfile, original_real_uid);
801: options.user_hostfile =
802: tilde_expand_filename(options.user_hostfile, original_real_uid);
803: options.system_hostfile2 =
804: tilde_expand_filename(options.system_hostfile2, original_real_uid);
805: options.user_hostfile2 =
806: tilde_expand_filename(options.user_hostfile2, original_real_uid);
1.149 markus 807:
808: signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
1.31 markus 809:
1.316 djm 810: /* Log into the remote system. Never returns if the login fails. */
1.303 djm 811: ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr,
812: pw, timeout_ms);
1.339 djm 813:
814: if (packet_connection_is_on_socket()) {
815: verbose("Authenticated to %s ([%s]:%d).", host,
816: get_remote_ipaddr(), get_remote_port());
817: } else {
818: verbose("Authenticated to %s (via proxy).", host);
819: }
1.31 markus 820:
1.112 markus 821: /* We no longer need the private host keys. Clear them now. */
822: if (sensitive_data.nkeys != 0) {
823: for (i = 0; i < sensitive_data.nkeys; i++) {
824: if (sensitive_data.keys[i] != NULL) {
825: /* Destroys contents safely */
826: debug3("clear hostkey %d", i);
827: key_free(sensitive_data.keys[i]);
828: sensitive_data.keys[i] = NULL;
829: }
830: }
831: xfree(sensitive_data.keys);
1.134 markus 832: }
833: for (i = 0; i < options.num_identity_files; i++) {
834: if (options.identity_files[i]) {
835: xfree(options.identity_files[i]);
836: options.identity_files[i] = NULL;
837: }
838: if (options.identity_keys[i]) {
839: key_free(options.identity_keys[i]);
840: options.identity_keys[i] = NULL;
841: }
1.112 markus 842: }
1.31 markus 843:
1.45 markus 844: exit_status = compat20 ? ssh_session2() : ssh_session();
845: packet_close();
1.186 djm 846:
1.312 djm 847: if (options.control_path != NULL && muxserver_sock != -1)
1.214 djm 848: unlink(options.control_path);
849:
1.186 djm 850: /*
1.203 djm 851: * Send SIGHUP to proxy command if used. We don't wait() in
1.186 djm 852: * case it hangs and instead rely on init to reap the child
853: */
854: if (proxy_command_pid > 1)
855: kill(proxy_command_pid, SIGHUP);
856:
1.45 markus 857: return exit_status;
858: }
859:
1.315 djm 860: /* Callback for remote forward global requests */
861: static void
862: ssh_confirm_remote_forward(int type, u_int32_t seq, void *ctxt)
863: {
864: Forward *rfwd = (Forward *)ctxt;
865:
1.324 djm 866: /* XXX verbose() on failure? */
1.315 djm 867: debug("remote forward %s for: listen %d, connect %s:%d",
868: type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
869: rfwd->listen_port, rfwd->connect_host, rfwd->connect_port);
1.324 djm 870: if (type == SSH2_MSG_REQUEST_SUCCESS && rfwd->listen_port == 0) {
1.338 markus 871: rfwd->allocated_port = packet_get_int();
1.324 djm 872: logit("Allocated port %u for remote forward to %s:%d",
1.338 markus 873: rfwd->allocated_port,
874: rfwd->connect_host, rfwd->connect_port);
1.324 djm 875: }
876:
1.315 djm 877: if (type == SSH2_MSG_REQUEST_FAILURE) {
878: if (options.exit_on_forward_failure)
879: fatal("Error: remote port forwarding failed for "
880: "listen port %d", rfwd->listen_port);
881: else
882: logit("Warning: remote port forwarding failed for "
883: "listen port %d", rfwd->listen_port);
884: }
1.318 djm 885: if (++remote_forward_confirms_received == options.num_remote_forwards) {
1.315 djm 886: debug("All remote forwarding requests processed");
1.318 djm 887: if (fork_after_authentication_flag) {
888: fork_after_authentication_flag = 0;
889: if (daemon(1, 1) < 0)
890: fatal("daemon() failed: %.200s",
891: strerror(errno));
892: }
893: }
1.315 djm 894: }
895:
1.126 itojun 896: static void
1.331 dtucker 897: client_cleanup_stdio_fwd(int id, void *arg)
898: {
899: debug("stdio forwarding: done");
900: cleanup_exit(0);
901: }
902:
903: static int
904: client_setup_stdio_fwd(const char *host_to_connect, u_short port_to_connect)
905: {
906: Channel *c;
1.332 djm 907: int in, out;
1.331 dtucker 908:
909: debug3("client_setup_stdio_fwd %s:%d", host_to_connect,
910: port_to_connect);
1.332 djm 911:
912: in = dup(STDIN_FILENO);
913: out = dup(STDOUT_FILENO);
914: if (in < 0 || out < 0)
915: fatal("channel_connect_stdio_fwd: dup() in/out failed");
916:
917: if ((c = channel_connect_stdio_fwd(host_to_connect, port_to_connect,
918: in, out)) == NULL)
1.331 dtucker 919: return 0;
920: channel_register_cleanup(c->self, client_cleanup_stdio_fwd, 0);
921: return 1;
922: }
923:
924: static void
1.70 markus 925: ssh_init_forwarding(void)
926: {
1.86 markus 927: int success = 0;
1.70 markus 928: int i;
1.331 dtucker 929:
930: if (stdio_forward_host != NULL) {
931: if (!compat20) {
932: fatal("stdio forwarding require Protocol 2");
933: }
934: if (!client_setup_stdio_fwd(stdio_forward_host,
935: stdio_forward_port))
936: fatal("Failed to connect in stdio forward mode.");
937: }
1.86 markus 938:
1.70 markus 939: /* Initiate local TCP/IP port forwardings. */
940: for (i = 0; i < options.num_local_forwards; i++) {
1.232 djm 941: debug("Local connections to %.200s:%d forwarded to remote "
942: "address %.200s:%d",
1.234 deraadt 943: (options.local_forwards[i].listen_host == NULL) ?
944: (options.gateway_ports ? "*" : "LOCALHOST") :
1.232 djm 945: options.local_forwards[i].listen_host,
946: options.local_forwards[i].listen_port,
947: options.local_forwards[i].connect_host,
948: options.local_forwards[i].connect_port);
1.158 markus 949: success += channel_setup_local_fwd_listener(
1.232 djm 950: options.local_forwards[i].listen_host,
951: options.local_forwards[i].listen_port,
952: options.local_forwards[i].connect_host,
953: options.local_forwards[i].connect_port,
1.70 markus 954: options.gateway_ports);
955: }
1.283 markus 956: if (i > 0 && success != i && options.exit_on_forward_failure)
957: fatal("Could not request local forwarding.");
1.86 markus 958: if (i > 0 && success == 0)
959: error("Could not request local forwarding.");
1.70 markus 960:
961: /* Initiate remote TCP/IP port forwardings. */
962: for (i = 0; i < options.num_remote_forwards; i++) {
1.232 djm 963: debug("Remote connections from %.200s:%d forwarded to "
964: "local address %.200s:%d",
1.248 djm 965: (options.remote_forwards[i].listen_host == NULL) ?
1.253 djm 966: "LOCALHOST" : options.remote_forwards[i].listen_host,
1.232 djm 967: options.remote_forwards[i].listen_port,
968: options.remote_forwards[i].connect_host,
969: options.remote_forwards[i].connect_port);
1.283 markus 970: if (channel_request_remote_forwarding(
1.232 djm 971: options.remote_forwards[i].listen_host,
972: options.remote_forwards[i].listen_port,
973: options.remote_forwards[i].connect_host,
1.283 markus 974: options.remote_forwards[i].connect_port) < 0) {
975: if (options.exit_on_forward_failure)
976: fatal("Could not request remote forwarding.");
977: else
978: logit("Warning: Could not request remote "
979: "forwarding.");
980: }
1.315 djm 981: client_register_global_confirm(ssh_confirm_remote_forward,
982: &options.remote_forwards[i]);
1.70 markus 983: }
1.301 djm 984:
985: /* Initiate tunnel forwarding. */
986: if (options.tun_open != SSH_TUNMODE_NO) {
987: if (client_request_tun_fwd(options.tun_open,
988: options.tun_local, options.tun_remote) == -1) {
989: if (options.exit_on_forward_failure)
990: fatal("Could not request tunnel forwarding.");
991: else
992: error("Could not request tunnel forwarding.");
993: }
994: }
1.70 markus 995: }
996:
1.126 itojun 997: static void
1.70 markus 998: check_agent_present(void)
999: {
1000: if (options.forward_agent) {
1.254 djm 1001: /* Clear agent forwarding if we don't have an agent. */
1.185 stevesk 1002: if (!ssh_agent_present())
1.70 markus 1003: options.forward_agent = 0;
1004: }
1005: }
1006:
1.126 itojun 1007: static int
1.45 markus 1008: ssh_session(void)
1009: {
1010: int type;
1011: int interactive = 0;
1012: int have_tty = 0;
1013: struct winsize ws;
1014: char *cp;
1.243 djm 1015: const char *display;
1.45 markus 1016:
1.31 markus 1017: /* Enable compression if requested. */
1018: if (options.compression) {
1.316 djm 1019: debug("Requesting compression at level %d.",
1020: options.compression_level);
1.31 markus 1021:
1.316 djm 1022: if (options.compression_level < 1 ||
1023: options.compression_level > 9)
1024: fatal("Compression level must be from 1 (fast) to "
1025: "9 (slow, best).");
1.31 markus 1026:
1027: /* Send the request. */
1028: packet_start(SSH_CMSG_REQUEST_COMPRESSION);
1029: packet_put_int(options.compression_level);
1030: packet_send();
1031: packet_write_wait();
1.156 markus 1032: type = packet_read();
1.31 markus 1033: if (type == SSH_SMSG_SUCCESS)
1034: packet_start_compression(options.compression_level);
1035: else if (type == SSH_SMSG_FAILURE)
1.191 itojun 1036: logit("Warning: Remote host refused compression.");
1.31 markus 1037: else
1.316 djm 1038: packet_disconnect("Protocol error waiting for "
1039: "compression response.");
1.31 markus 1040: }
1041: /* Allocate a pseudo tty if appropriate. */
1042: if (tty_flag) {
1043: debug("Requesting pty.");
1044:
1045: /* Start the packet. */
1046: packet_start(SSH_CMSG_REQUEST_PTY);
1047:
1048: /* Store TERM in the packet. There is no limit on the
1049: length of the string. */
1050: cp = getenv("TERM");
1051: if (!cp)
1052: cp = "";
1.124 markus 1053: packet_put_cstring(cp);
1.31 markus 1054:
1055: /* Store window size in the packet. */
1056: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
1057: memset(&ws, 0, sizeof(ws));
1.269 deraadt 1058: packet_put_int((u_int)ws.ws_row);
1059: packet_put_int((u_int)ws.ws_col);
1060: packet_put_int((u_int)ws.ws_xpixel);
1061: packet_put_int((u_int)ws.ws_ypixel);
1.31 markus 1062:
1063: /* Store tty modes in the packet. */
1.115 stevesk 1064: tty_make_modes(fileno(stdin), NULL);
1.31 markus 1065:
1066: /* Send the packet, and wait for it to leave. */
1067: packet_send();
1068: packet_write_wait();
1069:
1070: /* Read response from the server. */
1.156 markus 1071: type = packet_read();
1.43 markus 1072: if (type == SSH_SMSG_SUCCESS) {
1.31 markus 1073: interactive = 1;
1.45 markus 1074: have_tty = 1;
1.43 markus 1075: } else if (type == SSH_SMSG_FAILURE)
1.316 djm 1076: logit("Warning: Remote host failed or refused to "
1077: "allocate a pseudo tty.");
1.31 markus 1078: else
1.316 djm 1079: packet_disconnect("Protocol error waiting for pty "
1080: "request response.");
1.31 markus 1081: }
1082: /* Request X11 forwarding if enabled and DISPLAY is set. */
1.243 djm 1083: display = getenv("DISPLAY");
1084: if (options.forward_x11 && display != NULL) {
1.150 stevesk 1085: char *proto, *data;
1.50 markus 1086: /* Get reasonable local authentication information. */
1.243 djm 1087: client_x11_get_proto(display, options.xauth_location,
1.340 djm 1088: options.forward_x11_trusted,
1089: options.forward_x11_timeout,
1090: &proto, &data);
1.50 markus 1091: /* Request forwarding with authentication spoofing. */
1.316 djm 1092: debug("Requesting X11 forwarding with authentication "
1093: "spoofing.");
1.243 djm 1094: x11_request_forwarding_with_spoofing(0, display, proto, data);
1.31 markus 1095:
1096: /* Read response from the server. */
1.156 markus 1097: type = packet_read();
1.31 markus 1098: if (type == SSH_SMSG_SUCCESS) {
1099: interactive = 1;
1.50 markus 1100: } else if (type == SSH_SMSG_FAILURE) {
1.191 itojun 1101: logit("Warning: Remote host denied X11 forwarding.");
1.50 markus 1102: } else {
1.316 djm 1103: packet_disconnect("Protocol error waiting for X11 "
1104: "forwarding");
1.50 markus 1105: }
1.31 markus 1106: }
1107: /* Tell the packet module whether this is an interactive session. */
1.80 markus 1108: packet_set_interactive(interactive);
1.31 markus 1109:
1110: /* Request authentication agent forwarding if appropriate. */
1.70 markus 1111: check_agent_present();
1112:
1.31 markus 1113: if (options.forward_agent) {
1114: debug("Requesting authentication agent forwarding.");
1115: auth_request_forwarding();
1116:
1117: /* Read response from the server. */
1.156 markus 1118: type = packet_read();
1.155 markus 1119: packet_check_eom();
1.31 markus 1120: if (type != SSH_SMSG_SUCCESS)
1.191 itojun 1121: logit("Warning: Remote host denied authentication agent forwarding.");
1.31 markus 1122: }
1123:
1.70 markus 1124: /* Initiate port forwardings. */
1125: ssh_init_forwarding();
1.305 dtucker 1126:
1127: /* Execute a local command */
1128: if (options.local_command != NULL &&
1129: options.permit_local_command)
1130: ssh_local_cmd(options.local_command);
1.34 markus 1131:
1.318 djm 1132: /*
1133: * If requested and we are not interested in replies to remote
1134: * forwarding requests, then let ssh continue in the background.
1135: */
1136: if (fork_after_authentication_flag &&
1137: (!options.exit_on_forward_failure ||
1138: options.num_remote_forwards == 0)) {
1139: fork_after_authentication_flag = 0;
1.34 markus 1140: if (daemon(1, 1) < 0)
1141: fatal("daemon() failed: %.200s", strerror(errno));
1.318 djm 1142: }
1.31 markus 1143:
1.33 markus 1144: /*
1145: * If a command was specified on the command line, execute the
1146: * command now. Otherwise request the server to start a shell.
1147: */
1.31 markus 1148: if (buffer_len(&command) > 0) {
1149: int len = buffer_len(&command);
1150: if (len > 900)
1151: len = 900;
1.316 djm 1152: debug("Sending command: %.*s", len,
1153: (u_char *)buffer_ptr(&command));
1.31 markus 1154: packet_start(SSH_CMSG_EXEC_CMD);
1155: packet_put_string(buffer_ptr(&command), buffer_len(&command));
1156: packet_send();
1157: packet_write_wait();
1158: } else {
1159: debug("Requesting shell.");
1160: packet_start(SSH_CMSG_EXEC_SHELL);
1161: packet_send();
1162: packet_write_wait();
1163: }
1164:
1165: /* Enter the interactive session. */
1.119 stevesk 1166: return client_loop(have_tty, tty_flag ?
1167: options.escape_char : SSH_ESCAPECHAR_NONE, 0);
1.89 markus 1168: }
1169:
1.214 djm 1170: /* request pty/x11/agent/tcpfwd/shell for channel */
1171: static void
1.337 djm 1172: ssh_session2_setup(int id, int success, void *arg)
1.214 djm 1173: {
1.215 djm 1174: extern char **environ;
1.243 djm 1175: const char *display;
1176: int interactive = tty_flag;
1.337 djm 1177:
1178: if (!success)
1179: return; /* No need for error message, channels code sens one */
1.215 djm 1180:
1.248 djm 1181: display = getenv("DISPLAY");
1.243 djm 1182: if (options.forward_x11 && display != NULL) {
1.150 stevesk 1183: char *proto, *data;
1.50 markus 1184: /* Get reasonable local authentication information. */
1.243 djm 1185: client_x11_get_proto(display, options.xauth_location,
1.340 djm 1186: options.forward_x11_trusted,
1187: options.forward_x11_timeout, &proto, &data);
1.50 markus 1188: /* Request forwarding with authentication spoofing. */
1.316 djm 1189: debug("Requesting X11 forwarding with authentication "
1190: "spoofing.");
1.243 djm 1191: x11_request_forwarding_with_spoofing(id, display, proto, data);
1.80 markus 1192: interactive = 1;
1.50 markus 1193: /* XXX wait for reply */
1194: }
1195:
1.70 markus 1196: check_agent_present();
1197: if (options.forward_agent) {
1198: debug("Requesting authentication agent forwarding.");
1199: channel_request_start(id, "auth-agent-req@openssh.com", 0);
1200: packet_send();
1.212 djm 1201: }
1202:
1.214 djm 1203: client_session2_setup(id, tty_flag, subsystem_flag, getenv("TERM"),
1.311 djm 1204: NULL, fileno(stdin), &command, environ);
1.90 markus 1205:
1.80 markus 1206: packet_set_interactive(interactive);
1.45 markus 1207: }
1208:
1.143 markus 1209: /* open new channel for a session */
1.126 itojun 1210: static int
1.143 markus 1211: ssh_session2_open(void)
1.45 markus 1212: {
1.118 markus 1213: Channel *c;
1214: int window, packetmax, in, out, err;
1.60 markus 1215:
1.62 markus 1216: if (stdin_null_flag) {
1.93 itojun 1217: in = open(_PATH_DEVNULL, O_RDONLY);
1.62 markus 1218: } else {
1219: in = dup(STDIN_FILENO);
1220: }
1.60 markus 1221: out = dup(STDOUT_FILENO);
1222: err = dup(STDERR_FILENO);
1.45 markus 1223:
1224: if (in < 0 || out < 0 || err < 0)
1.62 markus 1225: fatal("dup() in/out/err failed");
1.45 markus 1226:
1.69 markus 1227: /* enable nonblocking unless tty */
1228: if (!isatty(in))
1229: set_nonblock(in);
1230: if (!isatty(out))
1231: set_nonblock(out);
1232: if (!isatty(err))
1233: set_nonblock(err);
1234:
1.65 markus 1235: window = CHAN_SES_WINDOW_DEFAULT;
1236: packetmax = CHAN_SES_PACKET_DEFAULT;
1.164 markus 1237: if (tty_flag) {
1238: window >>= 1;
1239: packetmax >>= 1;
1.45 markus 1240: }
1.118 markus 1241: c = channel_new(
1.45 markus 1242: "session", SSH_CHANNEL_OPENING, in, out, err,
1.65 markus 1243: window, packetmax, CHAN_EXTENDED_WRITE,
1.192 markus 1244: "client-session", /*nonblock*/0);
1.45 markus 1245:
1.143 markus 1246: debug3("ssh_session2_open: channel_new: %d", c->self);
1.106 markus 1247:
1.122 markus 1248: channel_send_open(c->self);
1.143 markus 1249: if (!no_shell_flag)
1.310 djm 1250: channel_register_open_confirm(c->self,
1251: ssh_session2_setup, NULL);
1.106 markus 1252:
1.118 markus 1253: return c->self;
1.106 markus 1254: }
1255:
1.126 itojun 1256: static int
1.106 markus 1257: ssh_session2(void)
1258: {
1.143 markus 1259: int id = -1;
1.106 markus 1260:
1261: /* XXX should be pre-session */
1262: ssh_init_forwarding();
1263:
1.143 markus 1264: if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN))
1265: id = ssh_session2_open();
1.314 djm 1266:
1267: /* If we don't expect to open a new session, then disallow it */
1.319 markus 1268: if (options.control_master == SSHCTL_MASTER_NO &&
1269: (datafellows & SSH_NEW_OPENSSH)) {
1.314 djm 1270: debug("Requesting no-more-sessions@openssh.com");
1271: packet_start(SSH2_MSG_GLOBAL_REQUEST);
1272: packet_put_cstring("no-more-sessions@openssh.com");
1273: packet_put_char(0);
1274: packet_send();
1275: }
1.255 reyk 1276:
1277: /* Execute a local command */
1278: if (options.local_command != NULL &&
1279: options.permit_local_command)
1280: ssh_local_cmd(options.local_command);
1.301 djm 1281:
1282: /* Start listening for multiplex clients */
1.312 djm 1283: muxserver_listen();
1.106 markus 1284:
1285: /* If requested, let ssh continue in the background. */
1.318 djm 1286: if (fork_after_authentication_flag) {
1287: fork_after_authentication_flag = 0;
1.106 markus 1288: if (daemon(1, 1) < 0)
1289: fatal("daemon() failed: %.200s", strerror(errno));
1.318 djm 1290: }
1.327 andreas 1291:
1292: if (options.use_roaming)
1293: request_roaming();
1.31 markus 1294:
1.119 stevesk 1295: return client_loop(tty_flag, tty_flag ?
1296: options.escape_char : SSH_ESCAPECHAR_NONE, id);
1.72 markus 1297: }
1298:
1.126 itojun 1299: static void
1.104 markus 1300: load_public_identity_files(void)
1301: {
1.275 djm 1302: char *filename, *cp, thishost[NI_MAXHOST];
1.306 deraadt 1303: char *pwdir = NULL, *pwname = NULL;
1.167 markus 1304: int i = 0;
1.104 markus 1305: Key *public;
1.275 djm 1306: struct passwd *pw;
1.335 djm 1307: u_int n_ids;
1308: char *identity_files[SSH_MAX_IDENTITY_FILES];
1309: Key *identity_keys[SSH_MAX_IDENTITY_FILES];
1.333 markus 1310: #ifdef ENABLE_PKCS11
1.167 markus 1311: Key **keys;
1.333 markus 1312: int nkeys;
1.335 djm 1313: #endif /* PKCS11 */
1.104 markus 1314:
1.335 djm 1315: n_ids = 0;
1316: bzero(identity_files, sizeof(identity_files));
1317: bzero(identity_keys, sizeof(identity_keys));
1318:
1319: #ifdef ENABLE_PKCS11
1.333 markus 1320: if (options.pkcs11_provider != NULL &&
1.167 markus 1321: options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
1.333 markus 1322: (pkcs11_init(!options.batch_mode) == 0) &&
1323: (nkeys = pkcs11_add_provider(options.pkcs11_provider, NULL,
1324: &keys)) > 0) {
1325: for (i = 0; i < nkeys; i++) {
1.335 djm 1326: if (n_ids >= SSH_MAX_IDENTITY_FILES) {
1327: key_free(keys[i]);
1328: continue;
1329: }
1330: identity_keys[n_ids] = keys[i];
1331: identity_files[n_ids] =
1.333 markus 1332: xstrdup(options.pkcs11_provider); /* XXX */
1.335 djm 1333: n_ids++;
1.167 markus 1334: }
1335: xfree(keys);
1.127 markus 1336: }
1.333 markus 1337: #endif /* ENABLE_PKCS11 */
1.275 djm 1338: if ((pw = getpwuid(original_real_uid)) == NULL)
1339: fatal("load_public_identity_files: getpwuid failed");
1.307 dtucker 1340: pwname = xstrdup(pw->pw_name);
1341: pwdir = xstrdup(pw->pw_dir);
1.275 djm 1342: if (gethostname(thishost, sizeof(thishost)) == -1)
1343: fatal("load_public_identity_files: gethostname: %s",
1344: strerror(errno));
1.335 djm 1345: for (i = 0; i < options.num_identity_files; i++) {
1346: if (n_ids >= SSH_MAX_IDENTITY_FILES) {
1347: xfree(options.identity_files[i]);
1348: continue;
1349: }
1.275 djm 1350: cp = tilde_expand_filename(options.identity_files[i],
1.131 millert 1351: original_real_uid);
1.306 deraadt 1352: filename = percent_expand(cp, "d", pwdir,
1353: "u", pwname, "l", thishost, "h", host,
1.275 djm 1354: "r", options.user, (char *)NULL);
1355: xfree(cp);
1.131 millert 1356: public = key_load_public(filename, NULL);
1357: debug("identity file %s type %d", filename,
1358: public ? public->type : -1);
1359: xfree(options.identity_files[i]);
1.335 djm 1360: identity_files[n_ids] = filename;
1361: identity_keys[n_ids] = public;
1362:
1363: if (++n_ids >= SSH_MAX_IDENTITY_FILES)
1364: continue;
1365:
1366: /* Try to add the certificate variant too */
1367: xasprintf(&cp, "%s-cert", filename);
1368: public = key_load_public(cp, NULL);
1369: debug("identity file %s type %d", cp,
1370: public ? public->type : -1);
1371: if (public == NULL) {
1372: xfree(cp);
1373: continue;
1374: }
1375: if (!key_is_cert(public)) {
1376: debug("%s: key %s type %s is not a certificate",
1377: __func__, cp, key_type(public));
1378: key_free(public);
1379: xfree(cp);
1380: continue;
1381: }
1382: identity_keys[n_ids] = public;
1383: /* point to the original path, most likely the private key */
1384: identity_files[n_ids] = xstrdup(filename);
1385: n_ids++;
1386: }
1387: options.num_identity_files = n_ids;
1388: memcpy(options.identity_files, identity_files, sizeof(identity_files));
1389: memcpy(options.identity_keys, identity_keys, sizeof(identity_keys));
1390:
1.306 deraadt 1391: bzero(pwname, strlen(pwname));
1.307 dtucker 1392: xfree(pwname);
1.306 deraadt 1393: bzero(pwdir, strlen(pwdir));
1.307 dtucker 1394: xfree(pwdir);
1.214 djm 1395: }
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