Annotation of src/usr.bin/ssh/ssh.c, Revision 1.286
1.286 ! stevesk 1: /* $OpenBSD: ssh.c,v 1.285 2006/07/11 20:27:56 stevesk 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:
43: #include "includes.h"
1.259 stevesk 44:
45: #include <sys/resource.h>
1.260 stevesk 46: #include <sys/ioctl.h>
1.262 stevesk 47: #include <sys/types.h>
1.280 stevesk 48: #include <sys/socket.h>
1.262 stevesk 49: #include <sys/un.h>
1.264 stevesk 50: #include <sys/stat.h>
1.258 stevesk 51:
1.265 stevesk 52: #include <ctype.h>
1.285 stevesk 53: #include <errno.h>
1.281 stevesk 54: #include <fcntl.h>
1.286 ! stevesk 55: #include <netdb.h>
1.258 stevesk 56: #include <paths.h>
1.279 stevesk 57: #include <pwd.h>
1.263 stevesk 58: #include <signal.h>
1.49 markus 59:
60: #include <openssl/evp.h>
1.72 markus 61: #include <openssl/err.h>
1.1 deraadt 62:
1.84 markus 63: #include "ssh.h"
64: #include "ssh1.h"
65: #include "ssh2.h"
66: #include "compat.h"
67: #include "cipher.h"
1.1 deraadt 68: #include "xmalloc.h"
69: #include "packet.h"
70: #include "buffer.h"
1.214 djm 71: #include "bufaux.h"
1.123 markus 72: #include "channels.h"
1.49 markus 73: #include "key.h"
1.58 markus 74: #include "authfd.h"
1.49 markus 75: #include "authfile.h"
1.83 markus 76: #include "pathnames.h"
1.214 djm 77: #include "dispatch.h"
1.81 markus 78: #include "clientloop.h"
1.84 markus 79: #include "log.h"
80: #include "readconf.h"
81: #include "sshconnect.h"
82: #include "misc.h"
1.95 markus 83: #include "kex.h"
84: #include "mac.h"
1.213 deraadt 85: #include "sshpty.h"
1.212 djm 86: #include "match.h"
1.214 djm 87: #include "msg.h"
88: #include "monitor_fdpass.h"
1.225 dtucker 89: #include "uidswap.h"
1.278 stevesk 90: #include "version.h"
1.49 markus 91:
1.127 markus 92: #ifdef SMARTCARD
93: #include "scard.h"
1.137 jakob 94: #endif
1.127 markus 95:
1.49 markus 96: extern char *__progname;
1.1 deraadt 97:
1.31 markus 98: /* Flag indicating whether debug mode is on. This can be set on the command line. */
1.1 deraadt 99: int debug_flag = 0;
100:
1.46 markus 101: /* Flag indicating whether a tty should be allocated */
1.1 deraadt 102: int tty_flag = 0;
1.79 markus 103: int no_tty_flag = 0;
104: int force_tty_flag = 0;
1.1 deraadt 105:
1.45 markus 106: /* don't exec a shell */
107: int no_shell_flag = 0;
108:
1.33 markus 109: /*
110: * Flag indicating that nothing should be read from stdin. This can be set
111: * on the command line.
112: */
1.1 deraadt 113: int stdin_null_flag = 0;
114:
1.33 markus 115: /*
116: * Flag indicating that ssh should fork after authentication. This is useful
1.172 deraadt 117: * so that the passphrase can be entered manually, and then ssh goes to the
1.33 markus 118: * background.
119: */
1.1 deraadt 120: int fork_after_authentication_flag = 0;
121:
1.33 markus 122: /*
123: * General data structure for command line options and options configurable
124: * in configuration files. See readconf.h.
125: */
1.1 deraadt 126: Options options;
127:
1.139 markus 128: /* optional user configfile */
129: char *config = NULL;
130:
1.33 markus 131: /*
132: * Name of the host we are connecting to. This is the name given on the
133: * command line, or the HostName specified for the user-supplied name in a
134: * configuration file.
135: */
1.1 deraadt 136: char *host;
137:
1.22 provos 138: /* socket address the host resolves to */
1.37 markus 139: struct sockaddr_storage hostaddr;
1.1 deraadt 140:
1.112 markus 141: /* Private host keys. */
1.173 markus 142: Sensitive sensitive_data;
1.1 deraadt 143:
1.10 dugsong 144: /* Original real UID. */
145: uid_t original_real_uid;
1.177 markus 146: uid_t original_effective_uid;
1.1 deraadt 147:
1.45 markus 148: /* command to be executed */
149: Buffer command;
150:
1.85 djm 151: /* Should we execute a command or invoke a subsystem? */
152: int subsystem_flag = 0;
153:
1.170 markus 154: /* # of replies received for global requests */
155: static int client_global_request_id = 0;
156:
1.186 djm 157: /* pid of proxycommand child process */
158: pid_t proxy_command_pid = 0;
159:
1.214 djm 160: /* fd to control socket */
161: int control_fd = -1;
162:
1.229 djm 163: /* Multiplexing control command */
1.240 djm 164: static u_int mux_command = 0;
1.229 djm 165:
1.214 djm 166: /* Only used in control client mode */
167: volatile sig_atomic_t control_client_terminate = 0;
168: u_int control_server_pid = 0;
169:
1.1 deraadt 170: /* Prints a help message to the user. This function never returns. */
171:
1.126 itojun 172: static void
1.93 itojun 173: usage(void)
1.1 deraadt 174: {
1.208 markus 175: fprintf(stderr,
1.230 jmc 176: "usage: ssh [-1246AaCfgkMNnqsTtVvXxY] [-b bind_address] [-c cipher_spec]\n"
1.251 jmc 177: " [-D [bind_address:]port] [-e escape_char] [-F configfile]\n"
1.233 jmc 178: " [-i identity_file] [-L [bind_address:]port:host:hostport]\n"
1.232 djm 179: " [-l login_name] [-m mac_spec] [-O ctl_cmd] [-o option] [-p port]\n"
1.233 jmc 180: " [-R [bind_address:]port:host:hostport] [-S ctl_path]\n"
1.277 stevesk 181: " [-w local_tun[:remote_tun]] [user@]hostname [command]\n"
1.208 markus 182: );
1.257 dtucker 183: exit(255);
1.1 deraadt 184: }
185:
1.126 itojun 186: static int ssh_session(void);
187: static int ssh_session2(void);
188: static void load_public_identity_files(void);
1.214 djm 189: static void control_client(const char *path);
1.45 markus 190:
1.32 deraadt 191: /*
192: * Main program for the ssh client.
193: */
1.2 provos 194: int
195: main(int ac, char **av)
1.1 deraadt 196: {
1.178 markus 197: int i, opt, exit_status;
1.205 markus 198: char *p, *cp, *line, buf[256];
1.31 markus 199: struct stat st;
1.98 markus 200: struct passwd *pw;
1.45 markus 201: int dummy;
1.144 stevesk 202: extern int optind, optreset;
203: extern char *optarg;
1.244 djm 204: struct servent *sp;
1.232 djm 205: Forward fwd;
1.250 djm 206:
207: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
208: sanitise_stdfd();
1.31 markus 209:
1.33 markus 210: /*
211: * Save the original real uid. It will be needed later (uid-swapping
212: * may clobber the real uid).
213: */
1.31 markus 214: original_real_uid = getuid();
215: original_effective_uid = geteuid();
216:
1.184 stevesk 217: /*
218: * Use uid-swapping to give up root privileges for the duration of
219: * option processing. We will re-instantiate the rights when we are
220: * ready to create the privileged port, and will permanently drop
221: * them when the port has been created (actually, when the connection
222: * has been made, as we may need to create the port several times).
223: */
224: PRIV_END;
225:
1.31 markus 226: /* If we are installed setuid root be careful to not drop core. */
227: if (original_real_uid != original_effective_uid) {
228: struct rlimit rlim;
229: rlim.rlim_cur = rlim.rlim_max = 0;
230: if (setrlimit(RLIMIT_CORE, &rlim) < 0)
231: fatal("setrlimit failed: %.100s", strerror(errno));
1.1 deraadt 232: }
1.107 markus 233: /* Get user data. */
234: pw = getpwuid(original_real_uid);
235: if (!pw) {
1.191 itojun 236: logit("You don't exist, go away!");
1.257 dtucker 237: exit(255);
1.107 markus 238: }
239: /* Take a copy of the returned structure. */
240: pw = pwcopy(pw);
1.31 markus 241:
1.33 markus 242: /*
243: * Set our umask to something reasonable, as some files are created
244: * with the default umask. This will make them world-readable but
245: * writable only by the owner, which is ok for all files for which we
246: * don't set the modes explicitly.
247: */
1.31 markus 248: umask(022);
249:
250: /* Initialize option structure to indicate that no values have been set. */
251: initialize_options(&options);
252:
253: /* Parse command-line arguments. */
254: host = NULL;
255:
1.266 djm 256: again:
1.128 fgsch 257: while ((opt = getopt(ac, av,
1.255 reyk 258: "1246ab:c:e:fgi:kl:m:no:p:qstvxACD:F:I:L:MNO:PR:S:TVw:XY")) != -1) {
1.31 markus 259: switch (opt) {
1.91 jakob 260: case '1':
261: options.protocol = SSH_PROTO_1;
262: break;
1.47 markus 263: case '2':
264: options.protocol = SSH_PROTO_2;
265: break;
1.37 markus 266: case '4':
1.196 djm 267: options.address_family = AF_INET;
1.37 markus 268: break;
269: case '6':
1.196 djm 270: options.address_family = AF_INET6;
1.37 markus 271: break;
1.31 markus 272: case 'n':
273: stdin_null_flag = 1;
274: break;
275: case 'f':
276: fork_after_authentication_flag = 1;
277: stdin_null_flag = 1;
278: break;
279: case 'x':
280: options.forward_x11 = 0;
281: break;
282: case 'X':
283: options.forward_x11 = 1;
284: break;
1.202 markus 285: case 'Y':
286: options.forward_x11 = 1;
287: options.forward_x11_trusted = 1;
288: break;
1.31 markus 289: case 'g':
290: options.gateway_ports = 1;
291: break;
1.229 djm 292: case 'O':
293: if (strcmp(optarg, "check") == 0)
294: mux_command = SSHMUX_COMMAND_ALIVE_CHECK;
295: else if (strcmp(optarg, "exit") == 0)
296: mux_command = SSHMUX_COMMAND_TERMINATE;
297: else
298: fatal("Invalid multiplex command.");
299: break;
1.183 stevesk 300: case 'P': /* deprecated */
1.31 markus 301: options.use_privileged_port = 0;
302: break;
303: case 'a':
304: options.forward_agent = 0;
1.53 markus 305: break;
306: case 'A':
307: options.forward_agent = 1;
1.31 markus 308: break;
309: case 'k':
1.204 dtucker 310: options.gss_deleg_creds = 0;
1.31 markus 311: break;
312: case 'i':
313: if (stat(optarg, &st) < 0) {
1.128 fgsch 314: fprintf(stderr, "Warning: Identity file %s "
1.231 otto 315: "not accessible: %s.\n", optarg,
316: strerror(errno));
1.31 markus 317: break;
318: }
1.128 fgsch 319: if (options.num_identity_files >=
320: SSH_MAX_IDENTITY_FILES)
321: fatal("Too many identity files specified "
322: "(max %d)", SSH_MAX_IDENTITY_FILES);
323: options.identity_files[options.num_identity_files++] =
324: xstrdup(optarg);
1.31 markus 325: break;
1.127 markus 326: case 'I':
327: #ifdef SMARTCARD
1.133 markus 328: options.smartcard_device = xstrdup(optarg);
1.137 jakob 329: #else
1.127 markus 330: fprintf(stderr, "no support for smartcards.\n");
1.137 jakob 331: #endif
1.127 markus 332: break;
1.31 markus 333: case 't':
1.79 markus 334: if (tty_flag)
335: force_tty_flag = 1;
1.31 markus 336: tty_flag = 1;
337: break;
338: case 'v':
1.197 markus 339: if (debug_flag == 0) {
1.66 markus 340: debug_flag = 1;
341: options.log_level = SYSLOG_LEVEL_DEBUG1;
1.197 markus 342: } else {
343: if (options.log_level < SYSLOG_LEVEL_DEBUG3)
344: options.log_level++;
1.66 markus 345: break;
1.197 markus 346: }
1.227 deraadt 347: /* FALLTHROUGH */
1.31 markus 348: case 'V':
1.209 markus 349: fprintf(stderr, "%s, %s\n",
350: SSH_VERSION, SSLeay_version(SSLEAY_VERSION));
1.31 markus 351: if (opt == 'V')
352: exit(0);
353: break;
1.255 reyk 354: case 'w':
1.256 reyk 355: if (options.tun_open == -1)
356: options.tun_open = SSH_TUNMODE_DEFAULT;
1.255 reyk 357: options.tun_local = a2tun(optarg, &options.tun_remote);
1.256 reyk 358: if (options.tun_local == SSH_TUNID_ERR) {
1.255 reyk 359: fprintf(stderr, "Bad tun device '%s'\n", optarg);
1.257 dtucker 360: exit(255);
1.255 reyk 361: }
362: break;
1.31 markus 363: case 'q':
364: options.log_level = SYSLOG_LEVEL_QUIET;
365: break;
366: case 'e':
367: if (optarg[0] == '^' && optarg[2] == 0 &&
1.128 fgsch 368: (u_char) optarg[1] >= 64 &&
369: (u_char) optarg[1] < 128)
1.78 markus 370: options.escape_char = (u_char) optarg[1] & 31;
1.31 markus 371: else if (strlen(optarg) == 1)
1.78 markus 372: options.escape_char = (u_char) optarg[0];
1.31 markus 373: else if (strcmp(optarg, "none") == 0)
1.119 stevesk 374: options.escape_char = SSH_ESCAPECHAR_NONE;
1.31 markus 375: else {
1.128 fgsch 376: fprintf(stderr, "Bad escape character '%s'.\n",
377: optarg);
1.257 dtucker 378: exit(255);
1.31 markus 379: }
380: break;
381: case 'c':
1.49 markus 382: if (ciphers_valid(optarg)) {
383: /* SSH2 only */
384: options.ciphers = xstrdup(optarg);
1.224 markus 385: options.cipher = SSH_CIPHER_INVALID;
1.49 markus 386: } else {
387: /* SSH1 only */
1.74 markus 388: options.cipher = cipher_number(optarg);
389: if (options.cipher == -1) {
1.128 fgsch 390: fprintf(stderr,
391: "Unknown cipher type '%s'\n",
392: optarg);
1.257 dtucker 393: exit(255);
1.49 markus 394: }
1.128 fgsch 395: if (options.cipher == SSH_CIPHER_3DES)
1.74 markus 396: options.ciphers = "3des-cbc";
1.128 fgsch 397: else if (options.cipher == SSH_CIPHER_BLOWFISH)
1.74 markus 398: options.ciphers = "blowfish-cbc";
1.128 fgsch 399: else
1.74 markus 400: options.ciphers = (char *)-1;
1.95 markus 401: }
402: break;
403: case 'm':
404: if (mac_valid(optarg))
405: options.macs = xstrdup(optarg);
406: else {
1.128 fgsch 407: fprintf(stderr, "Unknown mac type '%s'\n",
408: optarg);
1.257 dtucker 409: exit(255);
1.31 markus 410: }
411: break;
1.214 djm 412: case 'M':
1.242 djm 413: if (options.control_master == SSHCTL_MASTER_YES)
414: options.control_master = SSHCTL_MASTER_ASK;
415: else
416: options.control_master = SSHCTL_MASTER_YES;
1.214 djm 417: break;
1.31 markus 418: case 'p':
1.113 stevesk 419: options.port = a2port(optarg);
420: if (options.port == 0) {
1.109 markus 421: fprintf(stderr, "Bad port '%s'\n", optarg);
1.257 dtucker 422: exit(255);
1.109 markus 423: }
1.31 markus 424: break;
425: case 'l':
426: options.user = optarg;
427: break;
1.141 stevesk 428:
429: case 'L':
1.232 djm 430: if (parse_forward(&fwd, optarg))
431: add_local_forward(&options, &fwd);
432: else {
1.128 fgsch 433: fprintf(stderr,
1.232 djm 434: "Bad local forwarding specification '%s'\n",
1.128 fgsch 435: optarg);
1.257 dtucker 436: exit(255);
1.31 markus 437: }
1.232 djm 438: break;
439:
440: case 'R':
441: if (parse_forward(&fwd, optarg)) {
442: add_remote_forward(&options, &fwd);
443: } else {
1.128 fgsch 444: fprintf(stderr,
1.232 djm 445: "Bad remote forwarding specification "
446: "'%s'\n", optarg);
1.257 dtucker 447: exit(255);
1.31 markus 448: }
449: break;
1.108 markus 450:
451: case 'D':
1.232 djm 452: cp = p = xstrdup(optarg);
453: memset(&fwd, '\0', sizeof(fwd));
454: fwd.connect_host = "socks";
455: if ((fwd.listen_host = hpdelim(&cp)) == NULL) {
456: fprintf(stderr, "Bad dynamic forwarding "
457: "specification '%.100s'\n", optarg);
1.257 dtucker 458: exit(255);
1.232 djm 459: }
460: if (cp != NULL) {
461: fwd.listen_port = a2port(cp);
462: fwd.listen_host = cleanhostname(fwd.listen_host);
463: } else {
464: fwd.listen_port = a2port(fwd.listen_host);
1.249 djm 465: fwd.listen_host = NULL;
1.232 djm 466: }
467:
468: if (fwd.listen_port == 0) {
1.128 fgsch 469: fprintf(stderr, "Bad dynamic port '%s'\n",
470: optarg);
1.257 dtucker 471: exit(255);
1.109 markus 472: }
1.232 djm 473: add_local_forward(&options, &fwd);
474: xfree(p);
1.108 markus 475: break;
476:
1.31 markus 477: case 'C':
478: options.compression = 1;
479: break;
1.45 markus 480: case 'N':
481: no_shell_flag = 1;
482: no_tty_flag = 1;
483: break;
484: case 'T':
485: no_tty_flag = 1;
486: break;
1.31 markus 487: case 'o':
488: dummy = 1;
1.205 markus 489: line = xstrdup(optarg);
1.128 fgsch 490: if (process_config_line(&options, host ? host : "",
1.205 markus 491: line, "command-line", 0, &dummy) != 0)
1.257 dtucker 492: exit(255);
1.205 markus 493: xfree(line);
1.31 markus 494: break;
1.85 djm 495: case 's':
496: subsystem_flag = 1;
1.117 markus 497: break;
1.214 djm 498: case 'S':
499: if (options.control_path != NULL)
500: free(options.control_path);
501: options.control_path = xstrdup(optarg);
502: break;
1.117 markus 503: case 'b':
504: options.bind_address = optarg;
1.85 djm 505: break;
1.139 markus 506: case 'F':
507: config = optarg;
508: break;
1.31 markus 509: default:
510: usage();
1.1 deraadt 511: }
1.31 markus 512: }
513:
1.128 fgsch 514: ac -= optind;
515: av += optind;
516:
517: if (ac > 0 && !host && **av != '-') {
1.188 markus 518: if (strrchr(*av, '@')) {
1.128 fgsch 519: p = xstrdup(*av);
1.188 markus 520: cp = strrchr(p, '@');
1.128 fgsch 521: if (cp == NULL || cp == p)
522: usage();
523: options.user = p;
524: *cp = '\0';
525: host = ++cp;
526: } else
527: host = *av;
1.189 millert 528: if (ac > 1) {
529: optind = optreset = 1;
1.128 fgsch 530: goto again;
531: }
1.189 millert 532: ac--, av++;
1.128 fgsch 533: }
534:
1.31 markus 535: /* Check that we got a host name. */
536: if (!host)
537: usage();
538:
1.54 markus 539: SSLeay_add_all_algorithms();
1.72 markus 540: ERR_load_crypto_strings();
1.31 markus 541:
542: /* Initialize the command to execute on remote host. */
543: buffer_init(&command);
1.1 deraadt 544:
1.33 markus 545: /*
546: * Save the command to execute on the remote host in a buffer. There
547: * is no limit on the length of the command, except by the maximum
548: * packet size. Also sets the tty flag if there is no command.
549: */
1.128 fgsch 550: if (!ac) {
1.31 markus 551: /* No command specified - execute shell on a tty. */
552: tty_flag = 1;
1.85 djm 553: if (subsystem_flag) {
1.128 fgsch 554: fprintf(stderr,
555: "You must specify a subsystem to invoke.\n");
1.85 djm 556: usage();
557: }
1.31 markus 558: } else {
1.128 fgsch 559: /* A command has been specified. Store it into the buffer. */
560: for (i = 0; i < ac; i++) {
561: if (i)
1.31 markus 562: buffer_append(&command, " ", 1);
563: buffer_append(&command, av[i], strlen(av[i]));
564: }
565: }
566:
567: /* Cannot fork to background if no command. */
1.63 markus 568: if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag)
1.31 markus 569: fatal("Cannot fork into background without a command to execute.");
570:
571: /* Allocate a tty by default if no command specified. */
572: if (buffer_len(&command) == 0)
573: tty_flag = 1;
574:
1.180 deraadt 575: /* Force no tty */
1.75 markus 576: if (no_tty_flag)
577: tty_flag = 0;
1.31 markus 578: /* Do not allocate a tty if stdin is not a tty. */
1.236 djm 579: if ((!isatty(fileno(stdin)) || stdin_null_flag) && !force_tty_flag) {
1.31 markus 580: if (tty_flag)
1.191 itojun 581: logit("Pseudo-terminal will not be allocated because stdin is not a terminal.");
1.31 markus 582: tty_flag = 0;
583: }
1.45 markus 584:
1.101 markus 585: /*
586: * Initialize "log" output. Since we are the client all output
587: * actually goes to stderr.
588: */
1.111 markus 589: log_init(av[0], options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level,
590: SYSLOG_FACILITY_USER, 1);
1.31 markus 591:
1.139 markus 592: /*
593: * Read per-user configuration file. Ignore the system wide config
594: * file if the user specifies a config file on the command line.
595: */
596: if (config != NULL) {
1.211 djm 597: if (!read_config_file(config, host, &options, 0))
1.142 stevesk 598: fatal("Can't open user config file %.100s: "
599: "%.100s", config, strerror(errno));
1.139 markus 600: } else {
601: snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir,
602: _PATH_SSH_USER_CONFFILE);
1.210 djm 603: (void)read_config_file(buf, host, &options, 1);
1.139 markus 604:
1.145 markus 605: /* Read systemwide configuration file after use config. */
1.223 deraadt 606: (void)read_config_file(_PATH_HOST_CONFIG_FILE, host,
1.210 djm 607: &options, 0);
1.139 markus 608: }
1.31 markus 609:
610: /* Fill configuration defaults. */
611: fill_default_options(&options);
612:
1.196 djm 613: channel_set_af(options.address_family);
614:
1.31 markus 615: /* reinit */
1.101 markus 616: log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 1);
1.31 markus 617:
618: if (options.user == NULL)
619: options.user = xstrdup(pw->pw_name);
620:
621: if (options.hostname != NULL)
622: host = options.hostname;
1.195 markus 623:
624: /* force lowercase for hostkey matching */
625: if (options.host_key_alias != NULL) {
626: for (p = options.host_key_alias; *p; p++)
627: if (isupper(*p))
1.271 deraadt 628: *p = (char)tolower(*p);
1.195 markus 629: }
1.190 markus 630:
1.246 djm 631: /* Get default port if port has not been set. */
632: if (options.port == 0) {
633: sp = getservbyname(SSH_SERVICE_NAME, "tcp");
634: options.port = sp ? ntohs(sp->s_port) : SSH_DEFAULT_PORT;
635: }
636:
1.190 markus 637: if (options.proxy_command != NULL &&
638: strcmp(options.proxy_command, "none") == 0)
639: options.proxy_command = NULL;
1.245 djm 640: if (options.control_path != NULL &&
641: strcmp(options.control_path, "none") == 0)
642: options.control_path = NULL;
1.31 markus 643:
1.214 djm 644: if (options.control_path != NULL) {
1.275 djm 645: char thishost[NI_MAXHOST];
1.261 djm 646:
1.275 djm 647: if (gethostname(thishost, sizeof(thishost)) == -1)
1.261 djm 648: fatal("gethostname: %s", strerror(errno));
1.241 djm 649: snprintf(buf, sizeof(buf), "%d", options.port);
650: cp = tilde_expand_filename(options.control_path,
651: original_real_uid);
652: options.control_path = percent_expand(cp, "p", buf, "h", host,
1.275 djm 653: "r", options.user, "l", thishost, (char *)NULL);
1.241 djm 654: xfree(cp);
1.214 djm 655: }
1.240 djm 656: if (mux_command != 0 && options.control_path == NULL)
657: fatal("No ControlPath specified for \"-O\" command");
1.242 djm 658: if (options.control_path != NULL)
1.237 jakob 659: control_client(options.control_path);
1.214 djm 660:
1.77 markus 661: /* Open a connection to the remote host. */
1.203 djm 662: if (ssh_connect(host, &hostaddr, options.port,
1.196 djm 663: options.address_family, options.connection_attempts,
1.177 markus 664: original_effective_uid == 0 && options.use_privileged_port,
1.179 markus 665: options.proxy_command) != 0)
1.257 dtucker 666: exit(255);
1.31 markus 667:
1.33 markus 668: /*
669: * If we successfully made the connection, load the host private key
670: * in case we will need it later for combined rsa-rhosts
671: * authentication. This must be done before releasing extra
672: * privileges, because the file is only readable by root.
1.174 markus 673: * If we cannot access the private keys, load the public keys
674: * instead and try to execute the ssh-keysign helper instead.
1.33 markus 675: */
1.112 markus 676: sensitive_data.nkeys = 0;
677: sensitive_data.keys = NULL;
1.173 markus 678: sensitive_data.external_keysign = 0;
1.178 markus 679: if (options.rhosts_rsa_authentication ||
680: options.hostbased_authentication) {
1.112 markus 681: sensitive_data.nkeys = 3;
1.274 deraadt 682: sensitive_data.keys = xcalloc(sensitive_data.nkeys,
1.180 deraadt 683: sizeof(Key));
1.177 markus 684:
685: PRIV_START;
1.112 markus 686: sensitive_data.keys[0] = key_load_private_type(KEY_RSA1,
1.276 dtucker 687: _PATH_HOST_KEY_FILE, "", NULL, NULL);
1.112 markus 688: sensitive_data.keys[1] = key_load_private_type(KEY_DSA,
1.276 dtucker 689: _PATH_HOST_DSA_KEY_FILE, "", NULL, NULL);
1.112 markus 690: sensitive_data.keys[2] = key_load_private_type(KEY_RSA,
1.276 dtucker 691: _PATH_HOST_RSA_KEY_FILE, "", NULL, NULL);
1.177 markus 692: PRIV_END;
1.173 markus 693:
1.181 markus 694: if (options.hostbased_authentication == 1 &&
695: sensitive_data.keys[0] == NULL &&
1.173 markus 696: sensitive_data.keys[1] == NULL &&
697: sensitive_data.keys[2] == NULL) {
698: sensitive_data.keys[1] = key_load_public(
699: _PATH_HOST_DSA_KEY_FILE, NULL);
700: sensitive_data.keys[2] = key_load_public(
701: _PATH_HOST_RSA_KEY_FILE, NULL);
702: sensitive_data.external_keysign = 1;
703: }
1.31 markus 704: }
1.33 markus 705: /*
706: * Get rid of any extra privileges that we may have. We will no
707: * longer need them. Also, extra privileges could make it very hard
708: * to read identity files and other non-world-readable files from the
709: * user's home directory if it happens to be on a NFS volume where
710: * root is mapped to nobody.
711: */
1.225 dtucker 712: if (original_effective_uid == 0) {
713: PRIV_START;
714: permanently_set_uid(pw);
715: }
1.31 markus 716:
1.33 markus 717: /*
718: * Now that we are back to our own permissions, create ~/.ssh
1.254 djm 719: * directory if it doesn't already exist.
1.33 markus 720: */
1.138 jakob 721: snprintf(buf, sizeof buf, "%.100s%s%.100s", pw->pw_dir, strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR);
1.31 markus 722: if (stat(buf, &st) < 0)
1.57 djm 723: if (mkdir(buf, 0700) < 0)
1.31 markus 724: error("Could not create directory '%.200s'.", buf);
725:
1.104 markus 726: /* load options.identity_files */
727: load_public_identity_files();
728:
729: /* Expand ~ in known host file names. */
730: /* XXX mem-leaks: */
1.72 markus 731: options.system_hostfile =
732: tilde_expand_filename(options.system_hostfile, original_real_uid);
733: options.user_hostfile =
734: tilde_expand_filename(options.user_hostfile, original_real_uid);
735: options.system_hostfile2 =
736: tilde_expand_filename(options.system_hostfile2, original_real_uid);
737: options.user_hostfile2 =
738: tilde_expand_filename(options.user_hostfile2, original_real_uid);
1.149 markus 739:
740: signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
1.31 markus 741:
742: /* Log into the remote system. This never returns if the login fails. */
1.173 markus 743: ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr, pw);
1.31 markus 744:
1.112 markus 745: /* We no longer need the private host keys. Clear them now. */
746: if (sensitive_data.nkeys != 0) {
747: for (i = 0; i < sensitive_data.nkeys; i++) {
748: if (sensitive_data.keys[i] != NULL) {
749: /* Destroys contents safely */
750: debug3("clear hostkey %d", i);
751: key_free(sensitive_data.keys[i]);
752: sensitive_data.keys[i] = NULL;
753: }
754: }
755: xfree(sensitive_data.keys);
1.134 markus 756: }
757: for (i = 0; i < options.num_identity_files; i++) {
758: if (options.identity_files[i]) {
759: xfree(options.identity_files[i]);
760: options.identity_files[i] = NULL;
761: }
762: if (options.identity_keys[i]) {
763: key_free(options.identity_keys[i]);
764: options.identity_keys[i] = NULL;
765: }
1.112 markus 766: }
1.31 markus 767:
1.45 markus 768: exit_status = compat20 ? ssh_session2() : ssh_session();
769: packet_close();
1.186 djm 770:
1.214 djm 771: if (options.control_path != NULL && control_fd != -1)
772: unlink(options.control_path);
773:
1.186 djm 774: /*
1.203 djm 775: * Send SIGHUP to proxy command if used. We don't wait() in
1.186 djm 776: * case it hangs and instead rely on init to reap the child
777: */
778: if (proxy_command_pid > 1)
779: kill(proxy_command_pid, SIGHUP);
780:
1.45 markus 781: return exit_status;
782: }
783:
1.126 itojun 784: static void
1.70 markus 785: ssh_init_forwarding(void)
786: {
1.86 markus 787: int success = 0;
1.70 markus 788: int i;
1.86 markus 789:
1.70 markus 790: /* Initiate local TCP/IP port forwardings. */
791: for (i = 0; i < options.num_local_forwards; i++) {
1.232 djm 792: debug("Local connections to %.200s:%d forwarded to remote "
793: "address %.200s:%d",
1.234 deraadt 794: (options.local_forwards[i].listen_host == NULL) ?
795: (options.gateway_ports ? "*" : "LOCALHOST") :
1.232 djm 796: options.local_forwards[i].listen_host,
797: options.local_forwards[i].listen_port,
798: options.local_forwards[i].connect_host,
799: options.local_forwards[i].connect_port);
1.158 markus 800: success += channel_setup_local_fwd_listener(
1.232 djm 801: options.local_forwards[i].listen_host,
802: options.local_forwards[i].listen_port,
803: options.local_forwards[i].connect_host,
804: options.local_forwards[i].connect_port,
1.70 markus 805: options.gateway_ports);
806: }
1.283 markus 807: if (i > 0 && success != i && options.exit_on_forward_failure)
808: fatal("Could not request local forwarding.");
1.86 markus 809: if (i > 0 && success == 0)
810: error("Could not request local forwarding.");
1.70 markus 811:
812: /* Initiate remote TCP/IP port forwardings. */
813: for (i = 0; i < options.num_remote_forwards; i++) {
1.232 djm 814: debug("Remote connections from %.200s:%d forwarded to "
815: "local address %.200s:%d",
1.248 djm 816: (options.remote_forwards[i].listen_host == NULL) ?
1.253 djm 817: "LOCALHOST" : options.remote_forwards[i].listen_host,
1.232 djm 818: options.remote_forwards[i].listen_port,
819: options.remote_forwards[i].connect_host,
820: options.remote_forwards[i].connect_port);
1.283 markus 821: if (channel_request_remote_forwarding(
1.232 djm 822: options.remote_forwards[i].listen_host,
823: options.remote_forwards[i].listen_port,
824: options.remote_forwards[i].connect_host,
1.283 markus 825: options.remote_forwards[i].connect_port) < 0) {
826: if (options.exit_on_forward_failure)
827: fatal("Could not request remote forwarding.");
828: else
829: logit("Warning: Could not request remote "
830: "forwarding.");
831: }
1.70 markus 832: }
833: }
834:
1.126 itojun 835: static void
1.70 markus 836: check_agent_present(void)
837: {
838: if (options.forward_agent) {
1.254 djm 839: /* Clear agent forwarding if we don't have an agent. */
1.185 stevesk 840: if (!ssh_agent_present())
1.70 markus 841: options.forward_agent = 0;
842: }
843: }
844:
1.126 itojun 845: static int
1.45 markus 846: ssh_session(void)
847: {
848: int type;
849: int interactive = 0;
850: int have_tty = 0;
851: struct winsize ws;
852: char *cp;
1.243 djm 853: const char *display;
1.45 markus 854:
1.31 markus 855: /* Enable compression if requested. */
856: if (options.compression) {
857: debug("Requesting compression at level %d.", options.compression_level);
858:
859: if (options.compression_level < 1 || options.compression_level > 9)
860: fatal("Compression level must be from 1 (fast) to 9 (slow, best).");
861:
862: /* Send the request. */
863: packet_start(SSH_CMSG_REQUEST_COMPRESSION);
864: packet_put_int(options.compression_level);
865: packet_send();
866: packet_write_wait();
1.156 markus 867: type = packet_read();
1.31 markus 868: if (type == SSH_SMSG_SUCCESS)
869: packet_start_compression(options.compression_level);
870: else if (type == SSH_SMSG_FAILURE)
1.191 itojun 871: logit("Warning: Remote host refused compression.");
1.31 markus 872: else
873: packet_disconnect("Protocol error waiting for compression response.");
874: }
875: /* Allocate a pseudo tty if appropriate. */
876: if (tty_flag) {
877: debug("Requesting pty.");
878:
879: /* Start the packet. */
880: packet_start(SSH_CMSG_REQUEST_PTY);
881:
882: /* Store TERM in the packet. There is no limit on the
883: length of the string. */
884: cp = getenv("TERM");
885: if (!cp)
886: cp = "";
1.124 markus 887: packet_put_cstring(cp);
1.31 markus 888:
889: /* Store window size in the packet. */
890: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
891: memset(&ws, 0, sizeof(ws));
1.269 deraadt 892: packet_put_int((u_int)ws.ws_row);
893: packet_put_int((u_int)ws.ws_col);
894: packet_put_int((u_int)ws.ws_xpixel);
895: packet_put_int((u_int)ws.ws_ypixel);
1.31 markus 896:
897: /* Store tty modes in the packet. */
1.115 stevesk 898: tty_make_modes(fileno(stdin), NULL);
1.31 markus 899:
900: /* Send the packet, and wait for it to leave. */
901: packet_send();
902: packet_write_wait();
903:
904: /* Read response from the server. */
1.156 markus 905: type = packet_read();
1.43 markus 906: if (type == SSH_SMSG_SUCCESS) {
1.31 markus 907: interactive = 1;
1.45 markus 908: have_tty = 1;
1.43 markus 909: } else if (type == SSH_SMSG_FAILURE)
1.191 itojun 910: logit("Warning: Remote host failed or refused to allocate a pseudo tty.");
1.31 markus 911: else
912: packet_disconnect("Protocol error waiting for pty request response.");
913: }
914: /* Request X11 forwarding if enabled and DISPLAY is set. */
1.243 djm 915: display = getenv("DISPLAY");
916: if (options.forward_x11 && display != NULL) {
1.150 stevesk 917: char *proto, *data;
1.50 markus 918: /* Get reasonable local authentication information. */
1.243 djm 919: client_x11_get_proto(display, options.xauth_location,
920: options.forward_x11_trusted, &proto, &data);
1.50 markus 921: /* Request forwarding with authentication spoofing. */
1.31 markus 922: debug("Requesting X11 forwarding with authentication spoofing.");
1.243 djm 923: x11_request_forwarding_with_spoofing(0, display, proto, data);
1.31 markus 924:
925: /* Read response from the server. */
1.156 markus 926: type = packet_read();
1.31 markus 927: if (type == SSH_SMSG_SUCCESS) {
928: interactive = 1;
1.50 markus 929: } else if (type == SSH_SMSG_FAILURE) {
1.191 itojun 930: logit("Warning: Remote host denied X11 forwarding.");
1.50 markus 931: } else {
1.31 markus 932: packet_disconnect("Protocol error waiting for X11 forwarding");
1.50 markus 933: }
1.31 markus 934: }
935: /* Tell the packet module whether this is an interactive session. */
1.80 markus 936: packet_set_interactive(interactive);
1.31 markus 937:
938: /* Request authentication agent forwarding if appropriate. */
1.70 markus 939: check_agent_present();
940:
1.31 markus 941: if (options.forward_agent) {
942: debug("Requesting authentication agent forwarding.");
943: auth_request_forwarding();
944:
945: /* Read response from the server. */
1.156 markus 946: type = packet_read();
1.155 markus 947: packet_check_eom();
1.31 markus 948: if (type != SSH_SMSG_SUCCESS)
1.191 itojun 949: logit("Warning: Remote host denied authentication agent forwarding.");
1.31 markus 950: }
951:
1.70 markus 952: /* Initiate port forwardings. */
953: ssh_init_forwarding();
1.34 markus 954:
955: /* If requested, let ssh continue in the background. */
1.48 markus 956: if (fork_after_authentication_flag)
1.34 markus 957: if (daemon(1, 1) < 0)
958: fatal("daemon() failed: %.200s", strerror(errno));
1.31 markus 959:
1.33 markus 960: /*
961: * If a command was specified on the command line, execute the
962: * command now. Otherwise request the server to start a shell.
963: */
1.31 markus 964: if (buffer_len(&command) > 0) {
965: int len = buffer_len(&command);
966: if (len > 900)
967: len = 900;
1.152 stevesk 968: debug("Sending command: %.*s", len, (u_char *)buffer_ptr(&command));
1.31 markus 969: packet_start(SSH_CMSG_EXEC_CMD);
970: packet_put_string(buffer_ptr(&command), buffer_len(&command));
971: packet_send();
972: packet_write_wait();
973: } else {
974: debug("Requesting shell.");
975: packet_start(SSH_CMSG_EXEC_SHELL);
976: packet_send();
977: packet_write_wait();
978: }
979:
980: /* Enter the interactive session. */
1.119 stevesk 981: return client_loop(have_tty, tty_flag ?
982: options.escape_char : SSH_ESCAPECHAR_NONE, 0);
1.45 markus 983: }
984:
1.126 itojun 985: static void
1.214 djm 986: ssh_subsystem_reply(int type, u_int32_t seq, void *ctxt)
1.89 markus 987: {
988: int id, len;
989:
990: id = packet_get_int();
991: len = buffer_len(&command);
1.100 markus 992: if (len > 900)
993: len = 900;
1.155 markus 994: packet_check_eom();
1.89 markus 995: if (type == SSH2_MSG_CHANNEL_FAILURE)
996: fatal("Request for subsystem '%.*s' failed on channel %d",
1.152 stevesk 997: len, (u_char *)buffer_ptr(&command), id);
1.170 markus 998: }
999:
1000: void
1.206 markus 1001: client_global_request_reply_fwd(int type, u_int32_t seq, void *ctxt)
1.170 markus 1002: {
1003: int i;
1004:
1005: i = client_global_request_id++;
1.206 markus 1006: if (i >= options.num_remote_forwards)
1.170 markus 1007: return;
1008: debug("remote forward %s for: listen %d, connect %s:%d",
1009: type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
1.232 djm 1010: options.remote_forwards[i].listen_port,
1011: options.remote_forwards[i].connect_host,
1012: options.remote_forwards[i].connect_port);
1.283 markus 1013: if (type == SSH2_MSG_REQUEST_FAILURE) {
1014: if (options.exit_on_forward_failure)
1015: fatal("Error: remote port forwarding failed for "
1016: "listen port %d",
1017: options.remote_forwards[i].listen_port);
1018: else
1019: logit("Warning: remote port forwarding failed for "
1020: "listen port %d",
1021: options.remote_forwards[i].listen_port);
1022: }
1.89 markus 1023: }
1024:
1.126 itojun 1025: static void
1.214 djm 1026: ssh_control_listener(void)
1.45 markus 1027: {
1.214 djm 1028: struct sockaddr_un addr;
1029: mode_t old_umask;
1.223 deraadt 1030:
1.242 djm 1031: if (options.control_path == NULL ||
1032: options.control_master == SSHCTL_MASTER_NO)
1.214 djm 1033: return;
1034:
1.242 djm 1035: debug("setting up multiplex master socket");
1036:
1.214 djm 1037: memset(&addr, '\0', sizeof(addr));
1038: addr.sun_family = AF_UNIX;
1039: addr.sun_len = offsetof(struct sockaddr_un, sun_path) +
1040: strlen(options.control_path) + 1;
1041:
1042: if (strlcpy(addr.sun_path, options.control_path,
1043: sizeof(addr.sun_path)) >= sizeof(addr.sun_path))
1044: fatal("ControlPath too long");
1045:
1046: if ((control_fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0)
1.252 stevesk 1047: fatal("%s socket(): %s", __func__, strerror(errno));
1.214 djm 1048:
1049: old_umask = umask(0177);
1.270 deraadt 1050: if (bind(control_fd, (struct sockaddr *)&addr, addr.sun_len) == -1) {
1.214 djm 1051: control_fd = -1;
1.238 djm 1052: if (errno == EINVAL || errno == EADDRINUSE)
1.214 djm 1053: fatal("ControlSocket %s already exists",
1054: options.control_path);
1055: else
1.252 stevesk 1056: fatal("%s bind(): %s", __func__, strerror(errno));
1.214 djm 1057: }
1058: umask(old_umask);
1.80 markus 1059:
1.214 djm 1060: if (listen(control_fd, 64) == -1)
1.252 stevesk 1061: fatal("%s listen(): %s", __func__, strerror(errno));
1.31 markus 1062:
1.214 djm 1063: set_nonblock(control_fd);
1064: }
1.45 markus 1065:
1.214 djm 1066: /* request pty/x11/agent/tcpfwd/shell for channel */
1067: static void
1068: ssh_session2_setup(int id, void *arg)
1069: {
1.215 djm 1070: extern char **environ;
1.243 djm 1071: const char *display;
1072: int interactive = tty_flag;
1.215 djm 1073:
1.248 djm 1074: display = getenv("DISPLAY");
1.243 djm 1075: if (options.forward_x11 && display != NULL) {
1.150 stevesk 1076: char *proto, *data;
1.50 markus 1077: /* Get reasonable local authentication information. */
1.243 djm 1078: client_x11_get_proto(display, options.xauth_location,
1079: options.forward_x11_trusted, &proto, &data);
1.50 markus 1080: /* Request forwarding with authentication spoofing. */
1081: debug("Requesting X11 forwarding with authentication spoofing.");
1.243 djm 1082: x11_request_forwarding_with_spoofing(id, display, proto, data);
1.80 markus 1083: interactive = 1;
1.50 markus 1084: /* XXX wait for reply */
1085: }
1086:
1.70 markus 1087: check_agent_present();
1088: if (options.forward_agent) {
1089: debug("Requesting authentication agent forwarding.");
1090: channel_request_start(id, "auth-agent-req@openssh.com", 0);
1091: packet_send();
1.212 djm 1092: }
1093:
1.256 reyk 1094: if (options.tun_open != SSH_TUNMODE_NO) {
1.255 reyk 1095: Channel *c;
1096: int fd;
1097:
1098: debug("Requesting tun.");
1.256 reyk 1099: if ((fd = tun_open(options.tun_local,
1100: options.tun_open)) >= 0) {
1.255 reyk 1101: c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1,
1102: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT,
1103: 0, "tun", 1);
1104: c->datagram = 1;
1105: packet_start(SSH2_MSG_CHANNEL_OPEN);
1106: packet_put_cstring("tun@openssh.com");
1107: packet_put_int(c->self);
1108: packet_put_int(c->local_window_max);
1109: packet_put_int(c->local_maxpacket);
1.256 reyk 1110: packet_put_int(options.tun_open);
1.255 reyk 1111: packet_put_int(options.tun_remote);
1112: packet_send();
1113: }
1114: }
1115:
1.214 djm 1116: client_session2_setup(id, tty_flag, subsystem_flag, getenv("TERM"),
1.215 djm 1117: NULL, fileno(stdin), &command, environ, &ssh_subsystem_reply);
1.90 markus 1118:
1.80 markus 1119: packet_set_interactive(interactive);
1.45 markus 1120: }
1121:
1.143 markus 1122: /* open new channel for a session */
1.126 itojun 1123: static int
1.143 markus 1124: ssh_session2_open(void)
1.45 markus 1125: {
1.118 markus 1126: Channel *c;
1127: int window, packetmax, in, out, err;
1.60 markus 1128:
1.62 markus 1129: if (stdin_null_flag) {
1.93 itojun 1130: in = open(_PATH_DEVNULL, O_RDONLY);
1.62 markus 1131: } else {
1132: in = dup(STDIN_FILENO);
1133: }
1.60 markus 1134: out = dup(STDOUT_FILENO);
1135: err = dup(STDERR_FILENO);
1.45 markus 1136:
1137: if (in < 0 || out < 0 || err < 0)
1.62 markus 1138: fatal("dup() in/out/err failed");
1.45 markus 1139:
1.69 markus 1140: /* enable nonblocking unless tty */
1141: if (!isatty(in))
1142: set_nonblock(in);
1143: if (!isatty(out))
1144: set_nonblock(out);
1145: if (!isatty(err))
1146: set_nonblock(err);
1147:
1.65 markus 1148: window = CHAN_SES_WINDOW_DEFAULT;
1149: packetmax = CHAN_SES_PACKET_DEFAULT;
1.164 markus 1150: if (tty_flag) {
1151: window >>= 1;
1152: packetmax >>= 1;
1.45 markus 1153: }
1.118 markus 1154: c = channel_new(
1.45 markus 1155: "session", SSH_CHANNEL_OPENING, in, out, err,
1.65 markus 1156: window, packetmax, CHAN_EXTENDED_WRITE,
1.192 markus 1157: "client-session", /*nonblock*/0);
1.45 markus 1158:
1.143 markus 1159: debug3("ssh_session2_open: channel_new: %d", c->self);
1.106 markus 1160:
1.122 markus 1161: channel_send_open(c->self);
1.143 markus 1162: if (!no_shell_flag)
1.214 djm 1163: channel_register_confirm(c->self, ssh_session2_setup, NULL);
1.106 markus 1164:
1.118 markus 1165: return c->self;
1.106 markus 1166: }
1167:
1.126 itojun 1168: static int
1.106 markus 1169: ssh_session2(void)
1170: {
1.143 markus 1171: int id = -1;
1.106 markus 1172:
1173: /* XXX should be pre-session */
1174: ssh_init_forwarding();
1.214 djm 1175: ssh_control_listener();
1.106 markus 1176:
1.143 markus 1177: if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN))
1178: id = ssh_session2_open();
1.255 reyk 1179:
1180: /* Execute a local command */
1181: if (options.local_command != NULL &&
1182: options.permit_local_command)
1183: ssh_local_cmd(options.local_command);
1.106 markus 1184:
1185: /* If requested, let ssh continue in the background. */
1186: if (fork_after_authentication_flag)
1187: if (daemon(1, 1) < 0)
1188: fatal("daemon() failed: %.200s", strerror(errno));
1.31 markus 1189:
1.119 stevesk 1190: return client_loop(tty_flag, tty_flag ?
1191: options.escape_char : SSH_ESCAPECHAR_NONE, id);
1.72 markus 1192: }
1193:
1.126 itojun 1194: static void
1.104 markus 1195: load_public_identity_files(void)
1196: {
1.275 djm 1197: char *filename, *cp, thishost[NI_MAXHOST];
1.167 markus 1198: int i = 0;
1.104 markus 1199: Key *public;
1.275 djm 1200: struct passwd *pw;
1.167 markus 1201: #ifdef SMARTCARD
1202: Key **keys;
1.104 markus 1203:
1.133 markus 1204: if (options.smartcard_device != NULL &&
1.167 markus 1205: options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
1206: (keys = sc_get_keys(options.smartcard_device, NULL)) != NULL ) {
1207: int count = 0;
1208: for (i = 0; keys[i] != NULL; i++) {
1209: count++;
1210: memmove(&options.identity_files[1], &options.identity_files[0],
1211: sizeof(char *) * (SSH_MAX_IDENTITY_FILES - 1));
1212: memmove(&options.identity_keys[1], &options.identity_keys[0],
1213: sizeof(Key *) * (SSH_MAX_IDENTITY_FILES - 1));
1214: options.num_identity_files++;
1215: options.identity_keys[0] = keys[i];
1.194 markus 1216: options.identity_files[0] = sc_get_key_label(keys[i]);
1.167 markus 1217: }
1.168 markus 1218: if (options.num_identity_files > SSH_MAX_IDENTITY_FILES)
1219: options.num_identity_files = SSH_MAX_IDENTITY_FILES;
1.167 markus 1220: i = count;
1221: xfree(keys);
1.127 markus 1222: }
1.136 jakob 1223: #endif /* SMARTCARD */
1.275 djm 1224: if ((pw = getpwuid(original_real_uid)) == NULL)
1225: fatal("load_public_identity_files: getpwuid failed");
1226: if (gethostname(thishost, sizeof(thishost)) == -1)
1227: fatal("load_public_identity_files: gethostname: %s",
1228: strerror(errno));
1.131 millert 1229: for (; i < options.num_identity_files; i++) {
1.275 djm 1230: cp = tilde_expand_filename(options.identity_files[i],
1.131 millert 1231: original_real_uid);
1.275 djm 1232: filename = percent_expand(cp, "d", pw->pw_dir,
1233: "u", pw->pw_name, "l", thishost, "h", host,
1234: "r", options.user, (char *)NULL);
1235: xfree(cp);
1.131 millert 1236: public = key_load_public(filename, NULL);
1237: debug("identity file %s type %d", filename,
1238: public ? public->type : -1);
1239: xfree(options.identity_files[i]);
1240: options.identity_files[i] = filename;
1241: options.identity_keys[i] = public;
1242: }
1.214 djm 1243: }
1244:
1245: static void
1246: control_client_sighandler(int signo)
1247: {
1248: control_client_terminate = signo;
1249: }
1250:
1251: static void
1252: control_client_sigrelay(int signo)
1253: {
1254: if (control_server_pid > 1)
1255: kill(control_server_pid, signo);
1256: }
1257:
1.220 djm 1258: static int
1259: env_permitted(char *env)
1260: {
1.282 dtucker 1261: int i, ret;
1.220 djm 1262: char name[1024], *cp;
1263:
1.282 dtucker 1264: if ((cp = strchr(env, '=')) == NULL || cp == env)
1.220 djm 1265: return (0);
1.284 stevesk 1266: ret = snprintf(name, sizeof(name), "%.*s", (int)(cp - env), env);
1.282 dtucker 1267: if (ret <= 0 || (size_t)ret >= sizeof(name))
1268: fatal("env_permitted: name '%.100s...' too long", env);
1.220 djm 1269:
1270: for (i = 0; i < options.num_send_env; i++)
1271: if (match_pattern(name, options.send_env[i]))
1272: return (1);
1273:
1274: return (0);
1275: }
1276:
1.214 djm 1277: static void
1278: control_client(const char *path)
1279: {
1280: struct sockaddr_un addr;
1.228 djm 1281: int i, r, fd, sock, exitval, num_env;
1.214 djm 1282: Buffer m;
1.229 djm 1283: char *term;
1.215 djm 1284: extern char **environ;
1.229 djm 1285: u_int flags;
1.242 djm 1286:
1287: if (mux_command == 0)
1288: mux_command = SSHMUX_COMMAND_OPEN;
1289:
1290: switch (options.control_master) {
1291: case SSHCTL_MASTER_AUTO:
1292: case SSHCTL_MASTER_AUTO_ASK:
1293: debug("auto-mux: Trying existing master");
1294: /* FALLTHROUGH */
1295: case SSHCTL_MASTER_NO:
1296: break;
1297: default:
1298: return;
1299: }
1.228 djm 1300:
1.214 djm 1301: memset(&addr, '\0', sizeof(addr));
1302: addr.sun_family = AF_UNIX;
1303: addr.sun_len = offsetof(struct sockaddr_un, sun_path) +
1304: strlen(path) + 1;
1305:
1306: if (strlcpy(addr.sun_path, path,
1307: sizeof(addr.sun_path)) >= sizeof(addr.sun_path))
1308: fatal("ControlPath too long");
1309:
1310: if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) < 0)
1311: fatal("%s socket(): %s", __func__, strerror(errno));
1312:
1.270 deraadt 1313: if (connect(sock, (struct sockaddr *)&addr, addr.sun_len) == -1) {
1.240 djm 1314: if (mux_command != SSHMUX_COMMAND_OPEN) {
1315: fatal("Control socket connect(%.100s): %s", path,
1316: strerror(errno));
1317: }
1.239 djm 1318: if (errno == ENOENT)
1.268 deraadt 1319: debug("Control socket \"%.100s\" does not exist", path);
1.239 djm 1320: else {
1.268 deraadt 1321: error("Control socket connect(%.100s): %s", path,
1.239 djm 1322: strerror(errno));
1323: }
1.268 deraadt 1324: close(sock);
1325: return;
1326: }
1.248 djm 1327:
1.268 deraadt 1328: if (stdin_null_flag) {
1329: if ((fd = open(_PATH_DEVNULL, O_RDONLY)) == -1)
1330: fatal("open(/dev/null): %s", strerror(errno));
1331: if (dup2(fd, STDIN_FILENO) == -1)
1332: fatal("dup2: %s", strerror(errno));
1333: if (fd > STDERR_FILENO)
1334: close(fd);
1335: }
1.248 djm 1336:
1.247 djm 1337: term = getenv("TERM");
1.229 djm 1338:
1339: flags = 0;
1340: if (tty_flag)
1341: flags |= SSHMUX_FLAG_TTY;
1342: if (subsystem_flag)
1343: flags |= SSHMUX_FLAG_SUBSYS;
1.247 djm 1344: if (options.forward_x11)
1345: flags |= SSHMUX_FLAG_X11_FWD;
1346: if (options.forward_agent)
1347: flags |= SSHMUX_FLAG_AGENT_FWD;
1.214 djm 1348:
1349: buffer_init(&m);
1350:
1.229 djm 1351: /* Send our command to server */
1352: buffer_put_int(&m, mux_command);
1353: buffer_put_int(&m, flags);
1.247 djm 1354: if (ssh_msg_send(sock, SSHMUX_VER, &m) == -1)
1.229 djm 1355: fatal("%s: msg_send", __func__);
1356: buffer_clear(&m);
1357:
1358: /* Get authorisation status and PID of controlee */
1.214 djm 1359: if (ssh_msg_recv(sock, &m) == -1)
1360: fatal("%s: msg_recv", __func__);
1.247 djm 1361: if (buffer_get_char(&m) != SSHMUX_VER)
1.214 djm 1362: fatal("%s: wrong version", __func__);
1.216 djm 1363: if (buffer_get_int(&m) != 1)
1364: fatal("Connection to master denied");
1.214 djm 1365: control_server_pid = buffer_get_int(&m);
1366:
1367: buffer_clear(&m);
1368:
1.229 djm 1369: switch (mux_command) {
1370: case SSHMUX_COMMAND_ALIVE_CHECK:
1.234 deraadt 1371: fprintf(stderr, "Master running (pid=%d)\r\n",
1.229 djm 1372: control_server_pid);
1373: exit(0);
1374: case SSHMUX_COMMAND_TERMINATE:
1375: fprintf(stderr, "Exit request sent.\r\n");
1376: exit(0);
1377: case SSHMUX_COMMAND_OPEN:
1378: /* continue below */
1379: break;
1380: default:
1381: fatal("silly mux_command %d", mux_command);
1382: }
1383:
1384: /* SSHMUX_COMMAND_OPEN */
1.247 djm 1385: buffer_put_cstring(&m, term ? term : "");
1.214 djm 1386: buffer_append(&command, "\0", 1);
1387: buffer_put_cstring(&m, buffer_ptr(&command));
1.215 djm 1388:
1.220 djm 1389: if (options.num_send_env == 0 || environ == NULL) {
1390: buffer_put_int(&m, 0);
1.223 deraadt 1391: } else {
1.220 djm 1392: /* Pass environment */
1393: num_env = 0;
1394: for (i = 0; environ[i] != NULL; i++)
1395: if (env_permitted(environ[i]))
1396: num_env++; /* Count */
1.223 deraadt 1397:
1.220 djm 1398: buffer_put_int(&m, num_env);
1399:
1.222 dtucker 1400: for (i = 0; environ[i] != NULL && num_env >= 0; i++)
1401: if (env_permitted(environ[i])) {
1402: num_env--;
1.220 djm 1403: buffer_put_cstring(&m, environ[i]);
1.222 dtucker 1404: }
1.220 djm 1405: }
1.214 djm 1406:
1.247 djm 1407: if (ssh_msg_send(sock, SSHMUX_VER, &m) == -1)
1.214 djm 1408: fatal("%s: msg_send", __func__);
1409:
1410: mm_send_fd(sock, STDIN_FILENO);
1411: mm_send_fd(sock, STDOUT_FILENO);
1412: mm_send_fd(sock, STDERR_FILENO);
1413:
1414: /* Wait for reply, so master has a chance to gather ttymodes */
1415: buffer_clear(&m);
1416: if (ssh_msg_recv(sock, &m) == -1)
1417: fatal("%s: msg_recv", __func__);
1.247 djm 1418: if (buffer_get_char(&m) != SSHMUX_VER)
1.229 djm 1419: fatal("%s: wrong version", __func__);
1.214 djm 1420: buffer_free(&m);
1.218 djm 1421:
1.226 djm 1422: signal(SIGHUP, control_client_sighandler);
1.218 djm 1423: signal(SIGINT, control_client_sighandler);
1424: signal(SIGTERM, control_client_sighandler);
1425: signal(SIGWINCH, control_client_sigrelay);
1.214 djm 1426:
1427: if (tty_flag)
1428: enter_raw_mode();
1429:
1430: /* Stick around until the controlee closes the client_fd */
1431: exitval = 0;
1432: for (;!control_client_terminate;) {
1433: r = read(sock, &exitval, sizeof(exitval));
1434: if (r == 0) {
1435: debug2("Received EOF from master");
1436: break;
1437: }
1438: if (r > 0)
1439: debug2("Received exit status from master %d", exitval);
1440: if (r == -1 && errno != EINTR)
1441: fatal("%s: read %s", __func__, strerror(errno));
1442: }
1443:
1444: if (control_client_terminate)
1445: debug2("Exiting on signal %d", control_client_terminate);
1446:
1447: close(sock);
1448:
1449: leave_raw_mode();
1450:
1451: if (tty_flag && options.log_level != SYSLOG_LEVEL_QUIET)
1452: fprintf(stderr, "Connection to master closed.\r\n");
1453:
1454: exit(exitval);
1.1 deraadt 1455: }
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