Annotation of src/usr.bin/ssh/ssh.c, Revision 1.262
1.1 deraadt 1: /*
1.32 deraadt 2: * Author: Tatu Ylonen <ylo@cs.hut.fi>
3: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
4: * All rights reserved
5: * Ssh client program. This program can be used to log into a remote machine.
6: * The software supports strong authentication, encryption, and forwarding
7: * of X11, TCP/IP, and authentication connections.
8: *
1.64 deraadt 9: * As far as I am concerned, the code I have written for this software
10: * can be used freely for any purpose. Any derived versions of this
11: * software must be clearly marked as such, and if the derived work is
12: * incompatible with the protocol description in the RFC file, it must be
13: * called by a name other than "ssh" or "Secure Shell".
14: *
15: * Copyright (c) 1999 Niels Provos. All rights reserved.
1.202 markus 16: * Copyright (c) 2000, 2001, 2002, 2003 Markus Friedl. All rights reserved.
1.64 deraadt 17: *
18: * Modified to work with SSL by Niels Provos <provos@citi.umich.edu>
19: * in Canada (German citizen).
20: *
21: * Redistribution and use in source and binary forms, with or without
22: * modification, are permitted provided that the following conditions
23: * are met:
24: * 1. Redistributions of source code must retain the above copyright
25: * notice, this list of conditions and the following disclaimer.
26: * 2. Redistributions in binary form must reproduce the above copyright
27: * notice, this list of conditions and the following disclaimer in the
28: * documentation and/or other materials provided with the distribution.
29: *
30: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
31: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
32: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
33: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
34: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
35: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
36: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
37: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
38: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
39: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.32 deraadt 40: */
1.1 deraadt 41:
42: #include "includes.h"
1.262 ! stevesk 43: RCSID("$OpenBSD: ssh.c,v 1.261 2006/02/12 06:45:34 djm Exp $");
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>
! 48: #include <sys/un.h>
1.258 stevesk 49:
50: #include <paths.h>
1.49 markus 51:
52: #include <openssl/evp.h>
1.72 markus 53: #include <openssl/err.h>
1.1 deraadt 54:
1.84 markus 55: #include "ssh.h"
56: #include "ssh1.h"
57: #include "ssh2.h"
58: #include "compat.h"
59: #include "cipher.h"
1.1 deraadt 60: #include "xmalloc.h"
61: #include "packet.h"
62: #include "buffer.h"
1.214 djm 63: #include "bufaux.h"
1.123 markus 64: #include "channels.h"
1.49 markus 65: #include "key.h"
1.58 markus 66: #include "authfd.h"
1.49 markus 67: #include "authfile.h"
1.83 markus 68: #include "pathnames.h"
1.214 djm 69: #include "dispatch.h"
1.81 markus 70: #include "clientloop.h"
1.84 markus 71: #include "log.h"
72: #include "readconf.h"
73: #include "sshconnect.h"
74: #include "misc.h"
1.95 markus 75: #include "kex.h"
76: #include "mac.h"
1.213 deraadt 77: #include "sshpty.h"
1.212 djm 78: #include "match.h"
1.214 djm 79: #include "msg.h"
80: #include "monitor_fdpass.h"
1.225 dtucker 81: #include "uidswap.h"
1.49 markus 82:
1.127 markus 83: #ifdef SMARTCARD
84: #include "scard.h"
1.137 jakob 85: #endif
1.127 markus 86:
1.49 markus 87: extern char *__progname;
1.1 deraadt 88:
1.31 markus 89: /* Flag indicating whether debug mode is on. This can be set on the command line. */
1.1 deraadt 90: int debug_flag = 0;
91:
1.46 markus 92: /* Flag indicating whether a tty should be allocated */
1.1 deraadt 93: int tty_flag = 0;
1.79 markus 94: int no_tty_flag = 0;
95: int force_tty_flag = 0;
1.1 deraadt 96:
1.45 markus 97: /* don't exec a shell */
98: int no_shell_flag = 0;
99:
1.33 markus 100: /*
101: * Flag indicating that nothing should be read from stdin. This can be set
102: * on the command line.
103: */
1.1 deraadt 104: int stdin_null_flag = 0;
105:
1.33 markus 106: /*
107: * Flag indicating that ssh should fork after authentication. This is useful
1.172 deraadt 108: * so that the passphrase can be entered manually, and then ssh goes to the
1.33 markus 109: * background.
110: */
1.1 deraadt 111: int fork_after_authentication_flag = 0;
112:
1.33 markus 113: /*
114: * General data structure for command line options and options configurable
115: * in configuration files. See readconf.h.
116: */
1.1 deraadt 117: Options options;
118:
1.139 markus 119: /* optional user configfile */
120: char *config = NULL;
121:
1.33 markus 122: /*
123: * Name of the host we are connecting to. This is the name given on the
124: * command line, or the HostName specified for the user-supplied name in a
125: * configuration file.
126: */
1.1 deraadt 127: char *host;
128:
1.22 provos 129: /* socket address the host resolves to */
1.37 markus 130: struct sockaddr_storage hostaddr;
1.1 deraadt 131:
1.112 markus 132: /* Private host keys. */
1.173 markus 133: Sensitive sensitive_data;
1.1 deraadt 134:
1.10 dugsong 135: /* Original real UID. */
136: uid_t original_real_uid;
1.177 markus 137: uid_t original_effective_uid;
1.1 deraadt 138:
1.45 markus 139: /* command to be executed */
140: Buffer command;
141:
1.85 djm 142: /* Should we execute a command or invoke a subsystem? */
143: int subsystem_flag = 0;
144:
1.170 markus 145: /* # of replies received for global requests */
146: static int client_global_request_id = 0;
147:
1.186 djm 148: /* pid of proxycommand child process */
149: pid_t proxy_command_pid = 0;
150:
1.214 djm 151: /* fd to control socket */
152: int control_fd = -1;
153:
1.229 djm 154: /* Multiplexing control command */
1.240 djm 155: static u_int mux_command = 0;
1.229 djm 156:
1.214 djm 157: /* Only used in control client mode */
158: volatile sig_atomic_t control_client_terminate = 0;
159: u_int control_server_pid = 0;
160:
1.1 deraadt 161: /* Prints a help message to the user. This function never returns. */
162:
1.126 itojun 163: static void
1.93 itojun 164: usage(void)
1.1 deraadt 165: {
1.208 markus 166: fprintf(stderr,
1.230 jmc 167: "usage: ssh [-1246AaCfgkMNnqsTtVvXxY] [-b bind_address] [-c cipher_spec]\n"
1.251 jmc 168: " [-D [bind_address:]port] [-e escape_char] [-F configfile]\n"
1.233 jmc 169: " [-i identity_file] [-L [bind_address:]port:host:hostport]\n"
1.232 djm 170: " [-l login_name] [-m mac_spec] [-O ctl_cmd] [-o option] [-p port]\n"
1.233 jmc 171: " [-R [bind_address:]port:host:hostport] [-S ctl_path]\n"
1.255 reyk 172: " [-w tunnel:tunnel] [user@]hostname [command]\n"
1.208 markus 173: );
1.257 dtucker 174: exit(255);
1.1 deraadt 175: }
176:
1.126 itojun 177: static int ssh_session(void);
178: static int ssh_session2(void);
179: static void load_public_identity_files(void);
1.214 djm 180: static void control_client(const char *path);
1.45 markus 181:
1.32 deraadt 182: /*
183: * Main program for the ssh client.
184: */
1.2 provos 185: int
186: main(int ac, char **av)
1.1 deraadt 187: {
1.178 markus 188: int i, opt, exit_status;
1.205 markus 189: char *p, *cp, *line, buf[256];
1.31 markus 190: struct stat st;
1.98 markus 191: struct passwd *pw;
1.45 markus 192: int dummy;
1.144 stevesk 193: extern int optind, optreset;
194: extern char *optarg;
1.244 djm 195: struct servent *sp;
1.232 djm 196: Forward fwd;
1.250 djm 197:
198: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
199: sanitise_stdfd();
1.31 markus 200:
1.33 markus 201: /*
202: * Save the original real uid. It will be needed later (uid-swapping
203: * may clobber the real uid).
204: */
1.31 markus 205: original_real_uid = getuid();
206: original_effective_uid = geteuid();
207:
1.184 stevesk 208: /*
209: * Use uid-swapping to give up root privileges for the duration of
210: * option processing. We will re-instantiate the rights when we are
211: * ready to create the privileged port, and will permanently drop
212: * them when the port has been created (actually, when the connection
213: * has been made, as we may need to create the port several times).
214: */
215: PRIV_END;
216:
1.31 markus 217: /* If we are installed setuid root be careful to not drop core. */
218: if (original_real_uid != original_effective_uid) {
219: struct rlimit rlim;
220: rlim.rlim_cur = rlim.rlim_max = 0;
221: if (setrlimit(RLIMIT_CORE, &rlim) < 0)
222: fatal("setrlimit failed: %.100s", strerror(errno));
1.1 deraadt 223: }
1.107 markus 224: /* Get user data. */
225: pw = getpwuid(original_real_uid);
226: if (!pw) {
1.191 itojun 227: logit("You don't exist, go away!");
1.257 dtucker 228: exit(255);
1.107 markus 229: }
230: /* Take a copy of the returned structure. */
231: pw = pwcopy(pw);
1.31 markus 232:
1.33 markus 233: /*
234: * Set our umask to something reasonable, as some files are created
235: * with the default umask. This will make them world-readable but
236: * writable only by the owner, which is ok for all files for which we
237: * don't set the modes explicitly.
238: */
1.31 markus 239: umask(022);
240:
241: /* Initialize option structure to indicate that no values have been set. */
242: initialize_options(&options);
243:
244: /* Parse command-line arguments. */
245: host = NULL;
246:
1.128 fgsch 247: again:
248: while ((opt = getopt(ac, av,
1.255 reyk 249: "1246ab:c:e:fgi:kl:m:no:p:qstvxACD:F:I:L:MNO:PR:S:TVw:XY")) != -1) {
1.31 markus 250: switch (opt) {
1.91 jakob 251: case '1':
252: options.protocol = SSH_PROTO_1;
253: break;
1.47 markus 254: case '2':
255: options.protocol = SSH_PROTO_2;
256: break;
1.37 markus 257: case '4':
1.196 djm 258: options.address_family = AF_INET;
1.37 markus 259: break;
260: case '6':
1.196 djm 261: options.address_family = AF_INET6;
1.37 markus 262: break;
1.31 markus 263: case 'n':
264: stdin_null_flag = 1;
265: break;
266: case 'f':
267: fork_after_authentication_flag = 1;
268: stdin_null_flag = 1;
269: break;
270: case 'x':
271: options.forward_x11 = 0;
272: break;
273: case 'X':
274: options.forward_x11 = 1;
275: break;
1.202 markus 276: case 'Y':
277: options.forward_x11 = 1;
278: options.forward_x11_trusted = 1;
279: break;
1.31 markus 280: case 'g':
281: options.gateway_ports = 1;
282: break;
1.229 djm 283: case 'O':
284: if (strcmp(optarg, "check") == 0)
285: mux_command = SSHMUX_COMMAND_ALIVE_CHECK;
286: else if (strcmp(optarg, "exit") == 0)
287: mux_command = SSHMUX_COMMAND_TERMINATE;
288: else
289: fatal("Invalid multiplex command.");
290: break;
1.183 stevesk 291: case 'P': /* deprecated */
1.31 markus 292: options.use_privileged_port = 0;
293: break;
294: case 'a':
295: options.forward_agent = 0;
1.53 markus 296: break;
297: case 'A':
298: options.forward_agent = 1;
1.31 markus 299: break;
300: case 'k':
1.204 dtucker 301: options.gss_deleg_creds = 0;
1.31 markus 302: break;
303: case 'i':
304: if (stat(optarg, &st) < 0) {
1.128 fgsch 305: fprintf(stderr, "Warning: Identity file %s "
1.231 otto 306: "not accessible: %s.\n", optarg,
307: strerror(errno));
1.31 markus 308: break;
309: }
1.128 fgsch 310: if (options.num_identity_files >=
311: SSH_MAX_IDENTITY_FILES)
312: fatal("Too many identity files specified "
313: "(max %d)", SSH_MAX_IDENTITY_FILES);
314: options.identity_files[options.num_identity_files++] =
315: xstrdup(optarg);
1.31 markus 316: break;
1.127 markus 317: case 'I':
318: #ifdef SMARTCARD
1.133 markus 319: options.smartcard_device = xstrdup(optarg);
1.137 jakob 320: #else
1.127 markus 321: fprintf(stderr, "no support for smartcards.\n");
1.137 jakob 322: #endif
1.127 markus 323: break;
1.31 markus 324: case 't':
1.79 markus 325: if (tty_flag)
326: force_tty_flag = 1;
1.31 markus 327: tty_flag = 1;
328: break;
329: case 'v':
1.197 markus 330: if (debug_flag == 0) {
1.66 markus 331: debug_flag = 1;
332: options.log_level = SYSLOG_LEVEL_DEBUG1;
1.197 markus 333: } else {
334: if (options.log_level < SYSLOG_LEVEL_DEBUG3)
335: options.log_level++;
1.66 markus 336: break;
1.197 markus 337: }
1.227 deraadt 338: /* FALLTHROUGH */
1.31 markus 339: case 'V':
1.209 markus 340: fprintf(stderr, "%s, %s\n",
341: SSH_VERSION, SSLeay_version(SSLEAY_VERSION));
1.31 markus 342: if (opt == 'V')
343: exit(0);
344: break;
1.255 reyk 345: case 'w':
1.256 reyk 346: if (options.tun_open == -1)
347: options.tun_open = SSH_TUNMODE_DEFAULT;
1.255 reyk 348: options.tun_local = a2tun(optarg, &options.tun_remote);
1.256 reyk 349: if (options.tun_local == SSH_TUNID_ERR) {
1.255 reyk 350: fprintf(stderr, "Bad tun device '%s'\n", optarg);
1.257 dtucker 351: exit(255);
1.255 reyk 352: }
353: break;
1.31 markus 354: case 'q':
355: options.log_level = SYSLOG_LEVEL_QUIET;
356: break;
357: case 'e':
358: if (optarg[0] == '^' && optarg[2] == 0 &&
1.128 fgsch 359: (u_char) optarg[1] >= 64 &&
360: (u_char) optarg[1] < 128)
1.78 markus 361: options.escape_char = (u_char) optarg[1] & 31;
1.31 markus 362: else if (strlen(optarg) == 1)
1.78 markus 363: options.escape_char = (u_char) optarg[0];
1.31 markus 364: else if (strcmp(optarg, "none") == 0)
1.119 stevesk 365: options.escape_char = SSH_ESCAPECHAR_NONE;
1.31 markus 366: else {
1.128 fgsch 367: fprintf(stderr, "Bad escape character '%s'.\n",
368: optarg);
1.257 dtucker 369: exit(255);
1.31 markus 370: }
371: break;
372: case 'c':
1.49 markus 373: if (ciphers_valid(optarg)) {
374: /* SSH2 only */
375: options.ciphers = xstrdup(optarg);
1.224 markus 376: options.cipher = SSH_CIPHER_INVALID;
1.49 markus 377: } else {
378: /* SSH1 only */
1.74 markus 379: options.cipher = cipher_number(optarg);
380: if (options.cipher == -1) {
1.128 fgsch 381: fprintf(stderr,
382: "Unknown cipher type '%s'\n",
383: optarg);
1.257 dtucker 384: exit(255);
1.49 markus 385: }
1.128 fgsch 386: if (options.cipher == SSH_CIPHER_3DES)
1.74 markus 387: options.ciphers = "3des-cbc";
1.128 fgsch 388: else if (options.cipher == SSH_CIPHER_BLOWFISH)
1.74 markus 389: options.ciphers = "blowfish-cbc";
1.128 fgsch 390: else
1.74 markus 391: options.ciphers = (char *)-1;
1.95 markus 392: }
393: break;
394: case 'm':
395: if (mac_valid(optarg))
396: options.macs = xstrdup(optarg);
397: else {
1.128 fgsch 398: fprintf(stderr, "Unknown mac type '%s'\n",
399: optarg);
1.257 dtucker 400: exit(255);
1.31 markus 401: }
402: break;
1.214 djm 403: case 'M':
1.242 djm 404: if (options.control_master == SSHCTL_MASTER_YES)
405: options.control_master = SSHCTL_MASTER_ASK;
406: else
407: options.control_master = SSHCTL_MASTER_YES;
1.214 djm 408: break;
1.31 markus 409: case 'p':
1.113 stevesk 410: options.port = a2port(optarg);
411: if (options.port == 0) {
1.109 markus 412: fprintf(stderr, "Bad port '%s'\n", optarg);
1.257 dtucker 413: exit(255);
1.109 markus 414: }
1.31 markus 415: break;
416: case 'l':
417: options.user = optarg;
418: break;
1.141 stevesk 419:
420: case 'L':
1.232 djm 421: if (parse_forward(&fwd, optarg))
422: add_local_forward(&options, &fwd);
423: else {
1.128 fgsch 424: fprintf(stderr,
1.232 djm 425: "Bad local forwarding specification '%s'\n",
1.128 fgsch 426: optarg);
1.257 dtucker 427: exit(255);
1.31 markus 428: }
1.232 djm 429: break;
430:
431: case 'R':
432: if (parse_forward(&fwd, optarg)) {
433: add_remote_forward(&options, &fwd);
434: } else {
1.128 fgsch 435: fprintf(stderr,
1.232 djm 436: "Bad remote forwarding specification "
437: "'%s'\n", optarg);
1.257 dtucker 438: exit(255);
1.31 markus 439: }
440: break;
1.108 markus 441:
442: case 'D':
1.232 djm 443: cp = p = xstrdup(optarg);
444: memset(&fwd, '\0', sizeof(fwd));
445: fwd.connect_host = "socks";
446: if ((fwd.listen_host = hpdelim(&cp)) == NULL) {
447: fprintf(stderr, "Bad dynamic forwarding "
448: "specification '%.100s'\n", optarg);
1.257 dtucker 449: exit(255);
1.232 djm 450: }
451: if (cp != NULL) {
452: fwd.listen_port = a2port(cp);
453: fwd.listen_host = cleanhostname(fwd.listen_host);
454: } else {
455: fwd.listen_port = a2port(fwd.listen_host);
1.249 djm 456: fwd.listen_host = NULL;
1.232 djm 457: }
458:
459: if (fwd.listen_port == 0) {
1.128 fgsch 460: fprintf(stderr, "Bad dynamic port '%s'\n",
461: optarg);
1.257 dtucker 462: exit(255);
1.109 markus 463: }
1.232 djm 464: add_local_forward(&options, &fwd);
465: xfree(p);
1.108 markus 466: break;
467:
1.31 markus 468: case 'C':
469: options.compression = 1;
470: break;
1.45 markus 471: case 'N':
472: no_shell_flag = 1;
473: no_tty_flag = 1;
474: break;
475: case 'T':
476: no_tty_flag = 1;
477: break;
1.31 markus 478: case 'o':
479: dummy = 1;
1.205 markus 480: line = xstrdup(optarg);
1.128 fgsch 481: if (process_config_line(&options, host ? host : "",
1.205 markus 482: line, "command-line", 0, &dummy) != 0)
1.257 dtucker 483: exit(255);
1.205 markus 484: xfree(line);
1.31 markus 485: break;
1.85 djm 486: case 's':
487: subsystem_flag = 1;
1.117 markus 488: break;
1.214 djm 489: case 'S':
490: if (options.control_path != NULL)
491: free(options.control_path);
492: options.control_path = xstrdup(optarg);
493: break;
1.117 markus 494: case 'b':
495: options.bind_address = optarg;
1.85 djm 496: break;
1.139 markus 497: case 'F':
498: config = optarg;
499: break;
1.31 markus 500: default:
501: usage();
1.1 deraadt 502: }
1.31 markus 503: }
504:
1.128 fgsch 505: ac -= optind;
506: av += optind;
507:
508: if (ac > 0 && !host && **av != '-') {
1.188 markus 509: if (strrchr(*av, '@')) {
1.128 fgsch 510: p = xstrdup(*av);
1.188 markus 511: cp = strrchr(p, '@');
1.128 fgsch 512: if (cp == NULL || cp == p)
513: usage();
514: options.user = p;
515: *cp = '\0';
516: host = ++cp;
517: } else
518: host = *av;
1.189 millert 519: if (ac > 1) {
520: optind = optreset = 1;
1.128 fgsch 521: goto again;
522: }
1.189 millert 523: ac--, av++;
1.128 fgsch 524: }
525:
1.31 markus 526: /* Check that we got a host name. */
527: if (!host)
528: usage();
529:
1.54 markus 530: SSLeay_add_all_algorithms();
1.72 markus 531: ERR_load_crypto_strings();
1.31 markus 532:
533: /* Initialize the command to execute on remote host. */
534: buffer_init(&command);
1.1 deraadt 535:
1.33 markus 536: /*
537: * Save the command to execute on the remote host in a buffer. There
538: * is no limit on the length of the command, except by the maximum
539: * packet size. Also sets the tty flag if there is no command.
540: */
1.128 fgsch 541: if (!ac) {
1.31 markus 542: /* No command specified - execute shell on a tty. */
543: tty_flag = 1;
1.85 djm 544: if (subsystem_flag) {
1.128 fgsch 545: fprintf(stderr,
546: "You must specify a subsystem to invoke.\n");
1.85 djm 547: usage();
548: }
1.31 markus 549: } else {
1.128 fgsch 550: /* A command has been specified. Store it into the buffer. */
551: for (i = 0; i < ac; i++) {
552: if (i)
1.31 markus 553: buffer_append(&command, " ", 1);
554: buffer_append(&command, av[i], strlen(av[i]));
555: }
556: }
557:
558: /* Cannot fork to background if no command. */
1.63 markus 559: if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag)
1.31 markus 560: fatal("Cannot fork into background without a command to execute.");
561:
562: /* Allocate a tty by default if no command specified. */
563: if (buffer_len(&command) == 0)
564: tty_flag = 1;
565:
1.180 deraadt 566: /* Force no tty */
1.75 markus 567: if (no_tty_flag)
568: tty_flag = 0;
1.31 markus 569: /* Do not allocate a tty if stdin is not a tty. */
1.236 djm 570: if ((!isatty(fileno(stdin)) || stdin_null_flag) && !force_tty_flag) {
1.31 markus 571: if (tty_flag)
1.191 itojun 572: logit("Pseudo-terminal will not be allocated because stdin is not a terminal.");
1.31 markus 573: tty_flag = 0;
574: }
1.45 markus 575:
1.101 markus 576: /*
577: * Initialize "log" output. Since we are the client all output
578: * actually goes to stderr.
579: */
1.111 markus 580: log_init(av[0], options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level,
581: SYSLOG_FACILITY_USER, 1);
1.31 markus 582:
1.139 markus 583: /*
584: * Read per-user configuration file. Ignore the system wide config
585: * file if the user specifies a config file on the command line.
586: */
587: if (config != NULL) {
1.211 djm 588: if (!read_config_file(config, host, &options, 0))
1.142 stevesk 589: fatal("Can't open user config file %.100s: "
590: "%.100s", config, strerror(errno));
1.139 markus 591: } else {
592: snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir,
593: _PATH_SSH_USER_CONFFILE);
1.210 djm 594: (void)read_config_file(buf, host, &options, 1);
1.139 markus 595:
1.145 markus 596: /* Read systemwide configuration file after use config. */
1.223 deraadt 597: (void)read_config_file(_PATH_HOST_CONFIG_FILE, host,
1.210 djm 598: &options, 0);
1.139 markus 599: }
1.31 markus 600:
601: /* Fill configuration defaults. */
602: fill_default_options(&options);
603:
1.196 djm 604: channel_set_af(options.address_family);
605:
1.31 markus 606: /* reinit */
1.101 markus 607: log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 1);
1.31 markus 608:
609: if (options.user == NULL)
610: options.user = xstrdup(pw->pw_name);
611:
612: if (options.hostname != NULL)
613: host = options.hostname;
1.195 markus 614:
615: /* force lowercase for hostkey matching */
616: if (options.host_key_alias != NULL) {
617: for (p = options.host_key_alias; *p; p++)
618: if (isupper(*p))
619: *p = tolower(*p);
620: }
1.190 markus 621:
1.246 djm 622: /* Get default port if port has not been set. */
623: if (options.port == 0) {
624: sp = getservbyname(SSH_SERVICE_NAME, "tcp");
625: options.port = sp ? ntohs(sp->s_port) : SSH_DEFAULT_PORT;
626: }
627:
1.190 markus 628: if (options.proxy_command != NULL &&
629: strcmp(options.proxy_command, "none") == 0)
630: options.proxy_command = NULL;
1.245 djm 631: if (options.control_path != NULL &&
632: strcmp(options.control_path, "none") == 0)
633: options.control_path = NULL;
1.31 markus 634:
1.214 djm 635: if (options.control_path != NULL) {
1.261 djm 636: char me[NI_MAXHOST];
637:
638: if (gethostname(me, sizeof(me)) == -1)
639: fatal("gethostname: %s", strerror(errno));
1.241 djm 640: snprintf(buf, sizeof(buf), "%d", options.port);
641: cp = tilde_expand_filename(options.control_path,
642: original_real_uid);
643: options.control_path = percent_expand(cp, "p", buf, "h", host,
1.261 djm 644: "r", options.user, "l", me, (char *)NULL);
1.241 djm 645: xfree(cp);
1.214 djm 646: }
1.240 djm 647: if (mux_command != 0 && options.control_path == NULL)
648: fatal("No ControlPath specified for \"-O\" command");
1.242 djm 649: if (options.control_path != NULL)
1.237 jakob 650: control_client(options.control_path);
1.214 djm 651:
1.77 markus 652: /* Open a connection to the remote host. */
1.203 djm 653: if (ssh_connect(host, &hostaddr, options.port,
1.196 djm 654: options.address_family, options.connection_attempts,
1.177 markus 655: original_effective_uid == 0 && options.use_privileged_port,
1.179 markus 656: options.proxy_command) != 0)
1.257 dtucker 657: exit(255);
1.31 markus 658:
1.33 markus 659: /*
660: * If we successfully made the connection, load the host private key
661: * in case we will need it later for combined rsa-rhosts
662: * authentication. This must be done before releasing extra
663: * privileges, because the file is only readable by root.
1.174 markus 664: * If we cannot access the private keys, load the public keys
665: * instead and try to execute the ssh-keysign helper instead.
1.33 markus 666: */
1.112 markus 667: sensitive_data.nkeys = 0;
668: sensitive_data.keys = NULL;
1.173 markus 669: sensitive_data.external_keysign = 0;
1.178 markus 670: if (options.rhosts_rsa_authentication ||
671: options.hostbased_authentication) {
1.112 markus 672: sensitive_data.nkeys = 3;
1.180 deraadt 673: sensitive_data.keys = xmalloc(sensitive_data.nkeys *
674: sizeof(Key));
1.177 markus 675:
676: PRIV_START;
1.112 markus 677: sensitive_data.keys[0] = key_load_private_type(KEY_RSA1,
1.105 markus 678: _PATH_HOST_KEY_FILE, "", NULL);
1.112 markus 679: sensitive_data.keys[1] = key_load_private_type(KEY_DSA,
680: _PATH_HOST_DSA_KEY_FILE, "", NULL);
681: sensitive_data.keys[2] = key_load_private_type(KEY_RSA,
682: _PATH_HOST_RSA_KEY_FILE, "", NULL);
1.177 markus 683: PRIV_END;
1.173 markus 684:
1.181 markus 685: if (options.hostbased_authentication == 1 &&
686: sensitive_data.keys[0] == NULL &&
1.173 markus 687: sensitive_data.keys[1] == NULL &&
688: sensitive_data.keys[2] == NULL) {
689: sensitive_data.keys[1] = key_load_public(
690: _PATH_HOST_DSA_KEY_FILE, NULL);
691: sensitive_data.keys[2] = key_load_public(
692: _PATH_HOST_RSA_KEY_FILE, NULL);
693: sensitive_data.external_keysign = 1;
694: }
1.31 markus 695: }
1.33 markus 696: /*
697: * Get rid of any extra privileges that we may have. We will no
698: * longer need them. Also, extra privileges could make it very hard
699: * to read identity files and other non-world-readable files from the
700: * user's home directory if it happens to be on a NFS volume where
701: * root is mapped to nobody.
702: */
1.225 dtucker 703: if (original_effective_uid == 0) {
704: PRIV_START;
705: permanently_set_uid(pw);
706: }
1.31 markus 707:
1.33 markus 708: /*
709: * Now that we are back to our own permissions, create ~/.ssh
1.254 djm 710: * directory if it doesn't already exist.
1.33 markus 711: */
1.138 jakob 712: snprintf(buf, sizeof buf, "%.100s%s%.100s", pw->pw_dir, strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR);
1.31 markus 713: if (stat(buf, &st) < 0)
1.57 djm 714: if (mkdir(buf, 0700) < 0)
1.31 markus 715: error("Could not create directory '%.200s'.", buf);
716:
1.104 markus 717: /* load options.identity_files */
718: load_public_identity_files();
719:
720: /* Expand ~ in known host file names. */
721: /* XXX mem-leaks: */
1.72 markus 722: options.system_hostfile =
723: tilde_expand_filename(options.system_hostfile, original_real_uid);
724: options.user_hostfile =
725: tilde_expand_filename(options.user_hostfile, original_real_uid);
726: options.system_hostfile2 =
727: tilde_expand_filename(options.system_hostfile2, original_real_uid);
728: options.user_hostfile2 =
729: tilde_expand_filename(options.user_hostfile2, original_real_uid);
1.149 markus 730:
731: signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
1.31 markus 732:
733: /* Log into the remote system. This never returns if the login fails. */
1.173 markus 734: ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr, pw);
1.31 markus 735:
1.112 markus 736: /* We no longer need the private host keys. Clear them now. */
737: if (sensitive_data.nkeys != 0) {
738: for (i = 0; i < sensitive_data.nkeys; i++) {
739: if (sensitive_data.keys[i] != NULL) {
740: /* Destroys contents safely */
741: debug3("clear hostkey %d", i);
742: key_free(sensitive_data.keys[i]);
743: sensitive_data.keys[i] = NULL;
744: }
745: }
746: xfree(sensitive_data.keys);
1.134 markus 747: }
748: for (i = 0; i < options.num_identity_files; i++) {
749: if (options.identity_files[i]) {
750: xfree(options.identity_files[i]);
751: options.identity_files[i] = NULL;
752: }
753: if (options.identity_keys[i]) {
754: key_free(options.identity_keys[i]);
755: options.identity_keys[i] = NULL;
756: }
1.112 markus 757: }
1.31 markus 758:
1.45 markus 759: exit_status = compat20 ? ssh_session2() : ssh_session();
760: packet_close();
1.186 djm 761:
1.214 djm 762: if (options.control_path != NULL && control_fd != -1)
763: unlink(options.control_path);
764:
1.186 djm 765: /*
1.203 djm 766: * Send SIGHUP to proxy command if used. We don't wait() in
1.186 djm 767: * case it hangs and instead rely on init to reap the child
768: */
769: if (proxy_command_pid > 1)
770: kill(proxy_command_pid, SIGHUP);
771:
1.45 markus 772: return exit_status;
773: }
774:
1.126 itojun 775: static void
1.70 markus 776: ssh_init_forwarding(void)
777: {
1.86 markus 778: int success = 0;
1.70 markus 779: int i;
1.86 markus 780:
1.70 markus 781: /* Initiate local TCP/IP port forwardings. */
782: for (i = 0; i < options.num_local_forwards; i++) {
1.232 djm 783: debug("Local connections to %.200s:%d forwarded to remote "
784: "address %.200s:%d",
1.234 deraadt 785: (options.local_forwards[i].listen_host == NULL) ?
786: (options.gateway_ports ? "*" : "LOCALHOST") :
1.232 djm 787: options.local_forwards[i].listen_host,
788: options.local_forwards[i].listen_port,
789: options.local_forwards[i].connect_host,
790: options.local_forwards[i].connect_port);
1.158 markus 791: success += channel_setup_local_fwd_listener(
1.232 djm 792: options.local_forwards[i].listen_host,
793: options.local_forwards[i].listen_port,
794: options.local_forwards[i].connect_host,
795: options.local_forwards[i].connect_port,
1.70 markus 796: options.gateway_ports);
797: }
1.86 markus 798: if (i > 0 && success == 0)
799: error("Could not request local forwarding.");
1.70 markus 800:
801: /* Initiate remote TCP/IP port forwardings. */
802: for (i = 0; i < options.num_remote_forwards; i++) {
1.232 djm 803: debug("Remote connections from %.200s:%d forwarded to "
804: "local address %.200s:%d",
1.248 djm 805: (options.remote_forwards[i].listen_host == NULL) ?
1.253 djm 806: "LOCALHOST" : options.remote_forwards[i].listen_host,
1.232 djm 807: options.remote_forwards[i].listen_port,
808: options.remote_forwards[i].connect_host,
809: options.remote_forwards[i].connect_port);
1.70 markus 810: channel_request_remote_forwarding(
1.232 djm 811: options.remote_forwards[i].listen_host,
812: options.remote_forwards[i].listen_port,
813: options.remote_forwards[i].connect_host,
814: options.remote_forwards[i].connect_port);
1.70 markus 815: }
816: }
817:
1.126 itojun 818: static void
1.70 markus 819: check_agent_present(void)
820: {
821: if (options.forward_agent) {
1.254 djm 822: /* Clear agent forwarding if we don't have an agent. */
1.185 stevesk 823: if (!ssh_agent_present())
1.70 markus 824: options.forward_agent = 0;
825: }
826: }
827:
1.126 itojun 828: static int
1.45 markus 829: ssh_session(void)
830: {
831: int type;
832: int interactive = 0;
833: int have_tty = 0;
834: struct winsize ws;
835: char *cp;
1.243 djm 836: const char *display;
1.45 markus 837:
1.31 markus 838: /* Enable compression if requested. */
839: if (options.compression) {
840: debug("Requesting compression at level %d.", options.compression_level);
841:
842: if (options.compression_level < 1 || options.compression_level > 9)
843: fatal("Compression level must be from 1 (fast) to 9 (slow, best).");
844:
845: /* Send the request. */
846: packet_start(SSH_CMSG_REQUEST_COMPRESSION);
847: packet_put_int(options.compression_level);
848: packet_send();
849: packet_write_wait();
1.156 markus 850: type = packet_read();
1.31 markus 851: if (type == SSH_SMSG_SUCCESS)
852: packet_start_compression(options.compression_level);
853: else if (type == SSH_SMSG_FAILURE)
1.191 itojun 854: logit("Warning: Remote host refused compression.");
1.31 markus 855: else
856: packet_disconnect("Protocol error waiting for compression response.");
857: }
858: /* Allocate a pseudo tty if appropriate. */
859: if (tty_flag) {
860: debug("Requesting pty.");
861:
862: /* Start the packet. */
863: packet_start(SSH_CMSG_REQUEST_PTY);
864:
865: /* Store TERM in the packet. There is no limit on the
866: length of the string. */
867: cp = getenv("TERM");
868: if (!cp)
869: cp = "";
1.124 markus 870: packet_put_cstring(cp);
1.31 markus 871:
872: /* Store window size in the packet. */
873: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
874: memset(&ws, 0, sizeof(ws));
875: packet_put_int(ws.ws_row);
876: packet_put_int(ws.ws_col);
877: packet_put_int(ws.ws_xpixel);
878: packet_put_int(ws.ws_ypixel);
879:
880: /* Store tty modes in the packet. */
1.115 stevesk 881: tty_make_modes(fileno(stdin), NULL);
1.31 markus 882:
883: /* Send the packet, and wait for it to leave. */
884: packet_send();
885: packet_write_wait();
886:
887: /* Read response from the server. */
1.156 markus 888: type = packet_read();
1.43 markus 889: if (type == SSH_SMSG_SUCCESS) {
1.31 markus 890: interactive = 1;
1.45 markus 891: have_tty = 1;
1.43 markus 892: } else if (type == SSH_SMSG_FAILURE)
1.191 itojun 893: logit("Warning: Remote host failed or refused to allocate a pseudo tty.");
1.31 markus 894: else
895: packet_disconnect("Protocol error waiting for pty request response.");
896: }
897: /* Request X11 forwarding if enabled and DISPLAY is set. */
1.243 djm 898: display = getenv("DISPLAY");
899: if (options.forward_x11 && display != NULL) {
1.150 stevesk 900: char *proto, *data;
1.50 markus 901: /* Get reasonable local authentication information. */
1.243 djm 902: client_x11_get_proto(display, options.xauth_location,
903: options.forward_x11_trusted, &proto, &data);
1.50 markus 904: /* Request forwarding with authentication spoofing. */
1.31 markus 905: debug("Requesting X11 forwarding with authentication spoofing.");
1.243 djm 906: x11_request_forwarding_with_spoofing(0, display, proto, data);
1.31 markus 907:
908: /* Read response from the server. */
1.156 markus 909: type = packet_read();
1.31 markus 910: if (type == SSH_SMSG_SUCCESS) {
911: interactive = 1;
1.50 markus 912: } else if (type == SSH_SMSG_FAILURE) {
1.191 itojun 913: logit("Warning: Remote host denied X11 forwarding.");
1.50 markus 914: } else {
1.31 markus 915: packet_disconnect("Protocol error waiting for X11 forwarding");
1.50 markus 916: }
1.31 markus 917: }
918: /* Tell the packet module whether this is an interactive session. */
1.80 markus 919: packet_set_interactive(interactive);
1.31 markus 920:
921: /* Request authentication agent forwarding if appropriate. */
1.70 markus 922: check_agent_present();
923:
1.31 markus 924: if (options.forward_agent) {
925: debug("Requesting authentication agent forwarding.");
926: auth_request_forwarding();
927:
928: /* Read response from the server. */
1.156 markus 929: type = packet_read();
1.155 markus 930: packet_check_eom();
1.31 markus 931: if (type != SSH_SMSG_SUCCESS)
1.191 itojun 932: logit("Warning: Remote host denied authentication agent forwarding.");
1.31 markus 933: }
934:
1.70 markus 935: /* Initiate port forwardings. */
936: ssh_init_forwarding();
1.34 markus 937:
938: /* If requested, let ssh continue in the background. */
1.48 markus 939: if (fork_after_authentication_flag)
1.34 markus 940: if (daemon(1, 1) < 0)
941: fatal("daemon() failed: %.200s", strerror(errno));
1.31 markus 942:
1.33 markus 943: /*
944: * If a command was specified on the command line, execute the
945: * command now. Otherwise request the server to start a shell.
946: */
1.31 markus 947: if (buffer_len(&command) > 0) {
948: int len = buffer_len(&command);
949: if (len > 900)
950: len = 900;
1.152 stevesk 951: debug("Sending command: %.*s", len, (u_char *)buffer_ptr(&command));
1.31 markus 952: packet_start(SSH_CMSG_EXEC_CMD);
953: packet_put_string(buffer_ptr(&command), buffer_len(&command));
954: packet_send();
955: packet_write_wait();
956: } else {
957: debug("Requesting shell.");
958: packet_start(SSH_CMSG_EXEC_SHELL);
959: packet_send();
960: packet_write_wait();
961: }
962:
963: /* Enter the interactive session. */
1.119 stevesk 964: return client_loop(have_tty, tty_flag ?
965: options.escape_char : SSH_ESCAPECHAR_NONE, 0);
1.45 markus 966: }
967:
1.126 itojun 968: static void
1.214 djm 969: ssh_subsystem_reply(int type, u_int32_t seq, void *ctxt)
1.89 markus 970: {
971: int id, len;
972:
973: id = packet_get_int();
974: len = buffer_len(&command);
1.100 markus 975: if (len > 900)
976: len = 900;
1.155 markus 977: packet_check_eom();
1.89 markus 978: if (type == SSH2_MSG_CHANNEL_FAILURE)
979: fatal("Request for subsystem '%.*s' failed on channel %d",
1.152 stevesk 980: len, (u_char *)buffer_ptr(&command), id);
1.170 markus 981: }
982:
983: void
1.206 markus 984: client_global_request_reply_fwd(int type, u_int32_t seq, void *ctxt)
1.170 markus 985: {
986: int i;
987:
988: i = client_global_request_id++;
1.206 markus 989: if (i >= options.num_remote_forwards)
1.170 markus 990: return;
991: debug("remote forward %s for: listen %d, connect %s:%d",
992: type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
1.232 djm 993: options.remote_forwards[i].listen_port,
994: options.remote_forwards[i].connect_host,
995: options.remote_forwards[i].connect_port);
1.170 markus 996: if (type == SSH2_MSG_REQUEST_FAILURE)
1.232 djm 997: logit("Warning: remote port forwarding failed for listen "
998: "port %d", options.remote_forwards[i].listen_port);
1.89 markus 999: }
1000:
1.126 itojun 1001: static void
1.214 djm 1002: ssh_control_listener(void)
1.45 markus 1003: {
1.214 djm 1004: struct sockaddr_un addr;
1005: mode_t old_umask;
1.223 deraadt 1006:
1.242 djm 1007: if (options.control_path == NULL ||
1008: options.control_master == SSHCTL_MASTER_NO)
1.214 djm 1009: return;
1010:
1.242 djm 1011: debug("setting up multiplex master socket");
1012:
1.214 djm 1013: memset(&addr, '\0', sizeof(addr));
1014: addr.sun_family = AF_UNIX;
1015: addr.sun_len = offsetof(struct sockaddr_un, sun_path) +
1016: strlen(options.control_path) + 1;
1017:
1018: if (strlcpy(addr.sun_path, options.control_path,
1019: sizeof(addr.sun_path)) >= sizeof(addr.sun_path))
1020: fatal("ControlPath too long");
1021:
1022: if ((control_fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0)
1.252 stevesk 1023: fatal("%s socket(): %s", __func__, strerror(errno));
1.214 djm 1024:
1025: old_umask = umask(0177);
1026: if (bind(control_fd, (struct sockaddr*)&addr, addr.sun_len) == -1) {
1027: control_fd = -1;
1.238 djm 1028: if (errno == EINVAL || errno == EADDRINUSE)
1.214 djm 1029: fatal("ControlSocket %s already exists",
1030: options.control_path);
1031: else
1.252 stevesk 1032: fatal("%s bind(): %s", __func__, strerror(errno));
1.214 djm 1033: }
1034: umask(old_umask);
1.80 markus 1035:
1.214 djm 1036: if (listen(control_fd, 64) == -1)
1.252 stevesk 1037: fatal("%s listen(): %s", __func__, strerror(errno));
1.31 markus 1038:
1.214 djm 1039: set_nonblock(control_fd);
1040: }
1.45 markus 1041:
1.214 djm 1042: /* request pty/x11/agent/tcpfwd/shell for channel */
1043: static void
1044: ssh_session2_setup(int id, void *arg)
1045: {
1.215 djm 1046: extern char **environ;
1.243 djm 1047: const char *display;
1048: int interactive = tty_flag;
1.215 djm 1049:
1.248 djm 1050: display = getenv("DISPLAY");
1.243 djm 1051: if (options.forward_x11 && display != NULL) {
1.150 stevesk 1052: char *proto, *data;
1.50 markus 1053: /* Get reasonable local authentication information. */
1.243 djm 1054: client_x11_get_proto(display, options.xauth_location,
1055: options.forward_x11_trusted, &proto, &data);
1.50 markus 1056: /* Request forwarding with authentication spoofing. */
1057: debug("Requesting X11 forwarding with authentication spoofing.");
1.243 djm 1058: x11_request_forwarding_with_spoofing(id, display, proto, data);
1.80 markus 1059: interactive = 1;
1.50 markus 1060: /* XXX wait for reply */
1061: }
1062:
1.70 markus 1063: check_agent_present();
1064: if (options.forward_agent) {
1065: debug("Requesting authentication agent forwarding.");
1066: channel_request_start(id, "auth-agent-req@openssh.com", 0);
1067: packet_send();
1.212 djm 1068: }
1069:
1.256 reyk 1070: if (options.tun_open != SSH_TUNMODE_NO) {
1.255 reyk 1071: Channel *c;
1072: int fd;
1073:
1074: debug("Requesting tun.");
1.256 reyk 1075: if ((fd = tun_open(options.tun_local,
1076: options.tun_open)) >= 0) {
1.255 reyk 1077: c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1,
1078: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT,
1079: 0, "tun", 1);
1080: c->datagram = 1;
1081: packet_start(SSH2_MSG_CHANNEL_OPEN);
1082: packet_put_cstring("tun@openssh.com");
1083: packet_put_int(c->self);
1084: packet_put_int(c->local_window_max);
1085: packet_put_int(c->local_maxpacket);
1.256 reyk 1086: packet_put_int(options.tun_open);
1.255 reyk 1087: packet_put_int(options.tun_remote);
1088: packet_send();
1089: }
1090: }
1091:
1.214 djm 1092: client_session2_setup(id, tty_flag, subsystem_flag, getenv("TERM"),
1.215 djm 1093: NULL, fileno(stdin), &command, environ, &ssh_subsystem_reply);
1.90 markus 1094:
1.80 markus 1095: packet_set_interactive(interactive);
1.45 markus 1096: }
1097:
1.143 markus 1098: /* open new channel for a session */
1.126 itojun 1099: static int
1.143 markus 1100: ssh_session2_open(void)
1.45 markus 1101: {
1.118 markus 1102: Channel *c;
1103: int window, packetmax, in, out, err;
1.60 markus 1104:
1.62 markus 1105: if (stdin_null_flag) {
1.93 itojun 1106: in = open(_PATH_DEVNULL, O_RDONLY);
1.62 markus 1107: } else {
1108: in = dup(STDIN_FILENO);
1109: }
1.60 markus 1110: out = dup(STDOUT_FILENO);
1111: err = dup(STDERR_FILENO);
1.45 markus 1112:
1113: if (in < 0 || out < 0 || err < 0)
1.62 markus 1114: fatal("dup() in/out/err failed");
1.45 markus 1115:
1.69 markus 1116: /* enable nonblocking unless tty */
1117: if (!isatty(in))
1118: set_nonblock(in);
1119: if (!isatty(out))
1120: set_nonblock(out);
1121: if (!isatty(err))
1122: set_nonblock(err);
1123:
1.65 markus 1124: window = CHAN_SES_WINDOW_DEFAULT;
1125: packetmax = CHAN_SES_PACKET_DEFAULT;
1.164 markus 1126: if (tty_flag) {
1127: window >>= 1;
1128: packetmax >>= 1;
1.45 markus 1129: }
1.118 markus 1130: c = channel_new(
1.45 markus 1131: "session", SSH_CHANNEL_OPENING, in, out, err,
1.65 markus 1132: window, packetmax, CHAN_EXTENDED_WRITE,
1.192 markus 1133: "client-session", /*nonblock*/0);
1.45 markus 1134:
1.143 markus 1135: debug3("ssh_session2_open: channel_new: %d", c->self);
1.106 markus 1136:
1.122 markus 1137: channel_send_open(c->self);
1.143 markus 1138: if (!no_shell_flag)
1.214 djm 1139: channel_register_confirm(c->self, ssh_session2_setup, NULL);
1.106 markus 1140:
1.118 markus 1141: return c->self;
1.106 markus 1142: }
1143:
1.126 itojun 1144: static int
1.106 markus 1145: ssh_session2(void)
1146: {
1.143 markus 1147: int id = -1;
1.106 markus 1148:
1149: /* XXX should be pre-session */
1150: ssh_init_forwarding();
1.214 djm 1151: ssh_control_listener();
1.106 markus 1152:
1.143 markus 1153: if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN))
1154: id = ssh_session2_open();
1.255 reyk 1155:
1156: /* Execute a local command */
1157: if (options.local_command != NULL &&
1158: options.permit_local_command)
1159: ssh_local_cmd(options.local_command);
1.106 markus 1160:
1161: /* If requested, let ssh continue in the background. */
1162: if (fork_after_authentication_flag)
1163: if (daemon(1, 1) < 0)
1164: fatal("daemon() failed: %.200s", strerror(errno));
1.31 markus 1165:
1.119 stevesk 1166: return client_loop(tty_flag, tty_flag ?
1167: options.escape_char : SSH_ESCAPECHAR_NONE, id);
1.72 markus 1168: }
1169:
1.126 itojun 1170: static void
1.104 markus 1171: load_public_identity_files(void)
1172: {
1173: char *filename;
1.167 markus 1174: int i = 0;
1.104 markus 1175: Key *public;
1.167 markus 1176: #ifdef SMARTCARD
1177: Key **keys;
1.104 markus 1178:
1.133 markus 1179: if (options.smartcard_device != NULL &&
1.167 markus 1180: options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
1181: (keys = sc_get_keys(options.smartcard_device, NULL)) != NULL ) {
1182: int count = 0;
1183: for (i = 0; keys[i] != NULL; i++) {
1184: count++;
1185: memmove(&options.identity_files[1], &options.identity_files[0],
1186: sizeof(char *) * (SSH_MAX_IDENTITY_FILES - 1));
1187: memmove(&options.identity_keys[1], &options.identity_keys[0],
1188: sizeof(Key *) * (SSH_MAX_IDENTITY_FILES - 1));
1189: options.num_identity_files++;
1190: options.identity_keys[0] = keys[i];
1.194 markus 1191: options.identity_files[0] = sc_get_key_label(keys[i]);
1.167 markus 1192: }
1.168 markus 1193: if (options.num_identity_files > SSH_MAX_IDENTITY_FILES)
1194: options.num_identity_files = SSH_MAX_IDENTITY_FILES;
1.167 markus 1195: i = count;
1196: xfree(keys);
1.127 markus 1197: }
1.136 jakob 1198: #endif /* SMARTCARD */
1.131 millert 1199: for (; i < options.num_identity_files; i++) {
1200: filename = tilde_expand_filename(options.identity_files[i],
1201: original_real_uid);
1202: public = key_load_public(filename, NULL);
1203: debug("identity file %s type %d", filename,
1204: public ? public->type : -1);
1205: xfree(options.identity_files[i]);
1206: options.identity_files[i] = filename;
1207: options.identity_keys[i] = public;
1208: }
1.214 djm 1209: }
1210:
1211: static void
1212: control_client_sighandler(int signo)
1213: {
1214: control_client_terminate = signo;
1215: }
1216:
1217: static void
1218: control_client_sigrelay(int signo)
1219: {
1220: if (control_server_pid > 1)
1221: kill(control_server_pid, signo);
1222: }
1223:
1.220 djm 1224: static int
1225: env_permitted(char *env)
1226: {
1227: int i;
1228: char name[1024], *cp;
1229:
1230: strlcpy(name, env, sizeof(name));
1231: if ((cp = strchr(name, '=')) == NULL)
1232: return (0);
1233:
1234: *cp = '\0';
1235:
1236: for (i = 0; i < options.num_send_env; i++)
1237: if (match_pattern(name, options.send_env[i]))
1238: return (1);
1239:
1240: return (0);
1241: }
1242:
1.214 djm 1243: static void
1244: control_client(const char *path)
1245: {
1246: struct sockaddr_un addr;
1.228 djm 1247: int i, r, fd, sock, exitval, num_env;
1.214 djm 1248: Buffer m;
1.229 djm 1249: char *term;
1.215 djm 1250: extern char **environ;
1.229 djm 1251: u_int flags;
1.242 djm 1252:
1253: if (mux_command == 0)
1254: mux_command = SSHMUX_COMMAND_OPEN;
1255:
1256: switch (options.control_master) {
1257: case SSHCTL_MASTER_AUTO:
1258: case SSHCTL_MASTER_AUTO_ASK:
1259: debug("auto-mux: Trying existing master");
1260: /* FALLTHROUGH */
1261: case SSHCTL_MASTER_NO:
1262: break;
1263: default:
1264: return;
1265: }
1.228 djm 1266:
1.214 djm 1267: memset(&addr, '\0', sizeof(addr));
1268: addr.sun_family = AF_UNIX;
1269: addr.sun_len = offsetof(struct sockaddr_un, sun_path) +
1270: strlen(path) + 1;
1271:
1272: if (strlcpy(addr.sun_path, path,
1273: sizeof(addr.sun_path)) >= sizeof(addr.sun_path))
1274: fatal("ControlPath too long");
1275:
1276: if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) < 0)
1277: fatal("%s socket(): %s", __func__, strerror(errno));
1278:
1.237 jakob 1279: if (connect(sock, (struct sockaddr*)&addr, addr.sun_len) == -1) {
1.240 djm 1280: if (mux_command != SSHMUX_COMMAND_OPEN) {
1281: fatal("Control socket connect(%.100s): %s", path,
1282: strerror(errno));
1283: }
1.239 djm 1284: if (errno == ENOENT)
1285: debug("Control socket \"%.100s\" does not exist", path);
1286: else {
1287: error("Control socket connect(%.100s): %s", path,
1288: strerror(errno));
1289: }
1.237 jakob 1290: close(sock);
1291: return;
1292: }
1.248 djm 1293:
1.237 jakob 1294: if (stdin_null_flag) {
1295: if ((fd = open(_PATH_DEVNULL, O_RDONLY)) == -1)
1296: fatal("open(/dev/null): %s", strerror(errno));
1297: if (dup2(fd, STDIN_FILENO) == -1)
1298: fatal("dup2: %s", strerror(errno));
1299: if (fd > STDERR_FILENO)
1300: close(fd);
1301: }
1.248 djm 1302:
1.247 djm 1303: term = getenv("TERM");
1.229 djm 1304:
1305: flags = 0;
1306: if (tty_flag)
1307: flags |= SSHMUX_FLAG_TTY;
1308: if (subsystem_flag)
1309: flags |= SSHMUX_FLAG_SUBSYS;
1.247 djm 1310: if (options.forward_x11)
1311: flags |= SSHMUX_FLAG_X11_FWD;
1312: if (options.forward_agent)
1313: flags |= SSHMUX_FLAG_AGENT_FWD;
1.214 djm 1314:
1315: buffer_init(&m);
1316:
1.229 djm 1317: /* Send our command to server */
1318: buffer_put_int(&m, mux_command);
1319: buffer_put_int(&m, flags);
1.247 djm 1320: if (ssh_msg_send(sock, SSHMUX_VER, &m) == -1)
1.229 djm 1321: fatal("%s: msg_send", __func__);
1322: buffer_clear(&m);
1323:
1324: /* Get authorisation status and PID of controlee */
1.214 djm 1325: if (ssh_msg_recv(sock, &m) == -1)
1326: fatal("%s: msg_recv", __func__);
1.247 djm 1327: if (buffer_get_char(&m) != SSHMUX_VER)
1.214 djm 1328: fatal("%s: wrong version", __func__);
1.216 djm 1329: if (buffer_get_int(&m) != 1)
1330: fatal("Connection to master denied");
1.214 djm 1331: control_server_pid = buffer_get_int(&m);
1332:
1333: buffer_clear(&m);
1334:
1.229 djm 1335: switch (mux_command) {
1336: case SSHMUX_COMMAND_ALIVE_CHECK:
1.234 deraadt 1337: fprintf(stderr, "Master running (pid=%d)\r\n",
1.229 djm 1338: control_server_pid);
1339: exit(0);
1340: case SSHMUX_COMMAND_TERMINATE:
1341: fprintf(stderr, "Exit request sent.\r\n");
1342: exit(0);
1343: case SSHMUX_COMMAND_OPEN:
1344: /* continue below */
1345: break;
1346: default:
1347: fatal("silly mux_command %d", mux_command);
1348: }
1349:
1350: /* SSHMUX_COMMAND_OPEN */
1.247 djm 1351: buffer_put_cstring(&m, term ? term : "");
1.214 djm 1352: buffer_append(&command, "\0", 1);
1353: buffer_put_cstring(&m, buffer_ptr(&command));
1.215 djm 1354:
1.220 djm 1355: if (options.num_send_env == 0 || environ == NULL) {
1356: buffer_put_int(&m, 0);
1.223 deraadt 1357: } else {
1.220 djm 1358: /* Pass environment */
1359: num_env = 0;
1360: for (i = 0; environ[i] != NULL; i++)
1361: if (env_permitted(environ[i]))
1362: num_env++; /* Count */
1.223 deraadt 1363:
1.220 djm 1364: buffer_put_int(&m, num_env);
1365:
1.222 dtucker 1366: for (i = 0; environ[i] != NULL && num_env >= 0; i++)
1367: if (env_permitted(environ[i])) {
1368: num_env--;
1.220 djm 1369: buffer_put_cstring(&m, environ[i]);
1.222 dtucker 1370: }
1.220 djm 1371: }
1.214 djm 1372:
1.247 djm 1373: if (ssh_msg_send(sock, SSHMUX_VER, &m) == -1)
1.214 djm 1374: fatal("%s: msg_send", __func__);
1375:
1376: mm_send_fd(sock, STDIN_FILENO);
1377: mm_send_fd(sock, STDOUT_FILENO);
1378: mm_send_fd(sock, STDERR_FILENO);
1379:
1380: /* Wait for reply, so master has a chance to gather ttymodes */
1381: buffer_clear(&m);
1382: if (ssh_msg_recv(sock, &m) == -1)
1383: fatal("%s: msg_recv", __func__);
1.247 djm 1384: if (buffer_get_char(&m) != SSHMUX_VER)
1.229 djm 1385: fatal("%s: wrong version", __func__);
1.214 djm 1386: buffer_free(&m);
1.218 djm 1387:
1.226 djm 1388: signal(SIGHUP, control_client_sighandler);
1.218 djm 1389: signal(SIGINT, control_client_sighandler);
1390: signal(SIGTERM, control_client_sighandler);
1391: signal(SIGWINCH, control_client_sigrelay);
1.214 djm 1392:
1393: if (tty_flag)
1394: enter_raw_mode();
1395:
1396: /* Stick around until the controlee closes the client_fd */
1397: exitval = 0;
1398: for (;!control_client_terminate;) {
1399: r = read(sock, &exitval, sizeof(exitval));
1400: if (r == 0) {
1401: debug2("Received EOF from master");
1402: break;
1403: }
1404: if (r > 0)
1405: debug2("Received exit status from master %d", exitval);
1406: if (r == -1 && errno != EINTR)
1407: fatal("%s: read %s", __func__, strerror(errno));
1408: }
1409:
1410: if (control_client_terminate)
1411: debug2("Exiting on signal %d", control_client_terminate);
1412:
1413: close(sock);
1414:
1415: leave_raw_mode();
1416:
1417: if (tty_flag && options.log_level != SYSLOG_LEVEL_QUIET)
1418: fprintf(stderr, "Connection to master closed.\r\n");
1419:
1420: exit(exitval);
1.1 deraadt 1421: }
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