Annotation of src/usr.bin/ssh/ssh.c, Revision 1.258
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"
1.258 ! stevesk 43: RCSID("$OpenBSD: ssh.c,v 1.257 2005/12/20 04:41:07 dtucker Exp $");
! 44:
! 45: #include <paths.h>
1.49 markus 46:
47: #include <openssl/evp.h>
1.72 markus 48: #include <openssl/err.h>
1.1 deraadt 49:
1.84 markus 50: #include "ssh.h"
51: #include "ssh1.h"
52: #include "ssh2.h"
53: #include "compat.h"
54: #include "cipher.h"
1.1 deraadt 55: #include "xmalloc.h"
56: #include "packet.h"
57: #include "buffer.h"
1.214 djm 58: #include "bufaux.h"
1.123 markus 59: #include "channels.h"
1.49 markus 60: #include "key.h"
1.58 markus 61: #include "authfd.h"
1.49 markus 62: #include "authfile.h"
1.83 markus 63: #include "pathnames.h"
1.214 djm 64: #include "dispatch.h"
1.81 markus 65: #include "clientloop.h"
1.84 markus 66: #include "log.h"
67: #include "readconf.h"
68: #include "sshconnect.h"
69: #include "misc.h"
1.95 markus 70: #include "kex.h"
71: #include "mac.h"
1.213 deraadt 72: #include "sshpty.h"
1.212 djm 73: #include "match.h"
1.214 djm 74: #include "msg.h"
75: #include "monitor_fdpass.h"
1.225 dtucker 76: #include "uidswap.h"
1.49 markus 77:
1.127 markus 78: #ifdef SMARTCARD
79: #include "scard.h"
1.137 jakob 80: #endif
1.127 markus 81:
1.49 markus 82: extern char *__progname;
1.1 deraadt 83:
1.31 markus 84: /* Flag indicating whether debug mode is on. This can be set on the command line. */
1.1 deraadt 85: int debug_flag = 0;
86:
1.46 markus 87: /* Flag indicating whether a tty should be allocated */
1.1 deraadt 88: int tty_flag = 0;
1.79 markus 89: int no_tty_flag = 0;
90: int force_tty_flag = 0;
1.1 deraadt 91:
1.45 markus 92: /* don't exec a shell */
93: int no_shell_flag = 0;
94:
1.33 markus 95: /*
96: * Flag indicating that nothing should be read from stdin. This can be set
97: * on the command line.
98: */
1.1 deraadt 99: int stdin_null_flag = 0;
100:
1.33 markus 101: /*
102: * Flag indicating that ssh should fork after authentication. This is useful
1.172 deraadt 103: * so that the passphrase can be entered manually, and then ssh goes to the
1.33 markus 104: * background.
105: */
1.1 deraadt 106: int fork_after_authentication_flag = 0;
107:
1.33 markus 108: /*
109: * General data structure for command line options and options configurable
110: * in configuration files. See readconf.h.
111: */
1.1 deraadt 112: Options options;
113:
1.139 markus 114: /* optional user configfile */
115: char *config = NULL;
116:
1.33 markus 117: /*
118: * Name of the host we are connecting to. This is the name given on the
119: * command line, or the HostName specified for the user-supplied name in a
120: * configuration file.
121: */
1.1 deraadt 122: char *host;
123:
1.22 provos 124: /* socket address the host resolves to */
1.37 markus 125: struct sockaddr_storage hostaddr;
1.1 deraadt 126:
1.112 markus 127: /* Private host keys. */
1.173 markus 128: Sensitive sensitive_data;
1.1 deraadt 129:
1.10 dugsong 130: /* Original real UID. */
131: uid_t original_real_uid;
1.177 markus 132: uid_t original_effective_uid;
1.1 deraadt 133:
1.45 markus 134: /* command to be executed */
135: Buffer command;
136:
1.85 djm 137: /* Should we execute a command or invoke a subsystem? */
138: int subsystem_flag = 0;
139:
1.170 markus 140: /* # of replies received for global requests */
141: static int client_global_request_id = 0;
142:
1.186 djm 143: /* pid of proxycommand child process */
144: pid_t proxy_command_pid = 0;
145:
1.214 djm 146: /* fd to control socket */
147: int control_fd = -1;
148:
1.229 djm 149: /* Multiplexing control command */
1.240 djm 150: static u_int mux_command = 0;
1.229 djm 151:
1.214 djm 152: /* Only used in control client mode */
153: volatile sig_atomic_t control_client_terminate = 0;
154: u_int control_server_pid = 0;
155:
1.1 deraadt 156: /* Prints a help message to the user. This function never returns. */
157:
1.126 itojun 158: static void
1.93 itojun 159: usage(void)
1.1 deraadt 160: {
1.208 markus 161: fprintf(stderr,
1.230 jmc 162: "usage: ssh [-1246AaCfgkMNnqsTtVvXxY] [-b bind_address] [-c cipher_spec]\n"
1.251 jmc 163: " [-D [bind_address:]port] [-e escape_char] [-F configfile]\n"
1.233 jmc 164: " [-i identity_file] [-L [bind_address:]port:host:hostport]\n"
1.232 djm 165: " [-l login_name] [-m mac_spec] [-O ctl_cmd] [-o option] [-p port]\n"
1.233 jmc 166: " [-R [bind_address:]port:host:hostport] [-S ctl_path]\n"
1.255 reyk 167: " [-w tunnel:tunnel] [user@]hostname [command]\n"
1.208 markus 168: );
1.257 dtucker 169: exit(255);
1.1 deraadt 170: }
171:
1.126 itojun 172: static int ssh_session(void);
173: static int ssh_session2(void);
174: static void load_public_identity_files(void);
1.214 djm 175: static void control_client(const char *path);
1.45 markus 176:
1.32 deraadt 177: /*
178: * Main program for the ssh client.
179: */
1.2 provos 180: int
181: main(int ac, char **av)
1.1 deraadt 182: {
1.178 markus 183: int i, opt, exit_status;
1.205 markus 184: char *p, *cp, *line, buf[256];
1.31 markus 185: struct stat st;
1.98 markus 186: struct passwd *pw;
1.45 markus 187: int dummy;
1.144 stevesk 188: extern int optind, optreset;
189: extern char *optarg;
1.244 djm 190: struct servent *sp;
1.232 djm 191: Forward fwd;
1.250 djm 192:
193: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
194: sanitise_stdfd();
1.31 markus 195:
1.33 markus 196: /*
197: * Save the original real uid. It will be needed later (uid-swapping
198: * may clobber the real uid).
199: */
1.31 markus 200: original_real_uid = getuid();
201: original_effective_uid = geteuid();
202:
1.184 stevesk 203: /*
204: * Use uid-swapping to give up root privileges for the duration of
205: * option processing. We will re-instantiate the rights when we are
206: * ready to create the privileged port, and will permanently drop
207: * them when the port has been created (actually, when the connection
208: * has been made, as we may need to create the port several times).
209: */
210: PRIV_END;
211:
1.31 markus 212: /* If we are installed setuid root be careful to not drop core. */
213: if (original_real_uid != original_effective_uid) {
214: struct rlimit rlim;
215: rlim.rlim_cur = rlim.rlim_max = 0;
216: if (setrlimit(RLIMIT_CORE, &rlim) < 0)
217: fatal("setrlimit failed: %.100s", strerror(errno));
1.1 deraadt 218: }
1.107 markus 219: /* Get user data. */
220: pw = getpwuid(original_real_uid);
221: if (!pw) {
1.191 itojun 222: logit("You don't exist, go away!");
1.257 dtucker 223: exit(255);
1.107 markus 224: }
225: /* Take a copy of the returned structure. */
226: pw = pwcopy(pw);
1.31 markus 227:
1.33 markus 228: /*
229: * Set our umask to something reasonable, as some files are created
230: * with the default umask. This will make them world-readable but
231: * writable only by the owner, which is ok for all files for which we
232: * don't set the modes explicitly.
233: */
1.31 markus 234: umask(022);
235:
236: /* Initialize option structure to indicate that no values have been set. */
237: initialize_options(&options);
238:
239: /* Parse command-line arguments. */
240: host = NULL;
241:
1.128 fgsch 242: again:
243: while ((opt = getopt(ac, av,
1.255 reyk 244: "1246ab:c:e:fgi:kl:m:no:p:qstvxACD:F:I:L:MNO:PR:S:TVw:XY")) != -1) {
1.31 markus 245: switch (opt) {
1.91 jakob 246: case '1':
247: options.protocol = SSH_PROTO_1;
248: break;
1.47 markus 249: case '2':
250: options.protocol = SSH_PROTO_2;
251: break;
1.37 markus 252: case '4':
1.196 djm 253: options.address_family = AF_INET;
1.37 markus 254: break;
255: case '6':
1.196 djm 256: options.address_family = AF_INET6;
1.37 markus 257: break;
1.31 markus 258: case 'n':
259: stdin_null_flag = 1;
260: break;
261: case 'f':
262: fork_after_authentication_flag = 1;
263: stdin_null_flag = 1;
264: break;
265: case 'x':
266: options.forward_x11 = 0;
267: break;
268: case 'X':
269: options.forward_x11 = 1;
270: break;
1.202 markus 271: case 'Y':
272: options.forward_x11 = 1;
273: options.forward_x11_trusted = 1;
274: break;
1.31 markus 275: case 'g':
276: options.gateway_ports = 1;
277: break;
1.229 djm 278: case 'O':
279: if (strcmp(optarg, "check") == 0)
280: mux_command = SSHMUX_COMMAND_ALIVE_CHECK;
281: else if (strcmp(optarg, "exit") == 0)
282: mux_command = SSHMUX_COMMAND_TERMINATE;
283: else
284: fatal("Invalid multiplex command.");
285: break;
1.183 stevesk 286: case 'P': /* deprecated */
1.31 markus 287: options.use_privileged_port = 0;
288: break;
289: case 'a':
290: options.forward_agent = 0;
1.53 markus 291: break;
292: case 'A':
293: options.forward_agent = 1;
1.31 markus 294: break;
295: case 'k':
1.204 dtucker 296: options.gss_deleg_creds = 0;
1.31 markus 297: break;
298: case 'i':
299: if (stat(optarg, &st) < 0) {
1.128 fgsch 300: fprintf(stderr, "Warning: Identity file %s "
1.231 otto 301: "not accessible: %s.\n", optarg,
302: strerror(errno));
1.31 markus 303: break;
304: }
1.128 fgsch 305: if (options.num_identity_files >=
306: SSH_MAX_IDENTITY_FILES)
307: fatal("Too many identity files specified "
308: "(max %d)", SSH_MAX_IDENTITY_FILES);
309: options.identity_files[options.num_identity_files++] =
310: xstrdup(optarg);
1.31 markus 311: break;
1.127 markus 312: case 'I':
313: #ifdef SMARTCARD
1.133 markus 314: options.smartcard_device = xstrdup(optarg);
1.137 jakob 315: #else
1.127 markus 316: fprintf(stderr, "no support for smartcards.\n");
1.137 jakob 317: #endif
1.127 markus 318: break;
1.31 markus 319: case 't':
1.79 markus 320: if (tty_flag)
321: force_tty_flag = 1;
1.31 markus 322: tty_flag = 1;
323: break;
324: case 'v':
1.197 markus 325: if (debug_flag == 0) {
1.66 markus 326: debug_flag = 1;
327: options.log_level = SYSLOG_LEVEL_DEBUG1;
1.197 markus 328: } else {
329: if (options.log_level < SYSLOG_LEVEL_DEBUG3)
330: options.log_level++;
1.66 markus 331: break;
1.197 markus 332: }
1.227 deraadt 333: /* FALLTHROUGH */
1.31 markus 334: case 'V':
1.209 markus 335: fprintf(stderr, "%s, %s\n",
336: SSH_VERSION, SSLeay_version(SSLEAY_VERSION));
1.31 markus 337: if (opt == 'V')
338: exit(0);
339: break;
1.255 reyk 340: case 'w':
1.256 reyk 341: if (options.tun_open == -1)
342: options.tun_open = SSH_TUNMODE_DEFAULT;
1.255 reyk 343: options.tun_local = a2tun(optarg, &options.tun_remote);
1.256 reyk 344: if (options.tun_local == SSH_TUNID_ERR) {
1.255 reyk 345: fprintf(stderr, "Bad tun device '%s'\n", optarg);
1.257 dtucker 346: exit(255);
1.255 reyk 347: }
348: break;
1.31 markus 349: case 'q':
350: options.log_level = SYSLOG_LEVEL_QUIET;
351: break;
352: case 'e':
353: if (optarg[0] == '^' && optarg[2] == 0 &&
1.128 fgsch 354: (u_char) optarg[1] >= 64 &&
355: (u_char) optarg[1] < 128)
1.78 markus 356: options.escape_char = (u_char) optarg[1] & 31;
1.31 markus 357: else if (strlen(optarg) == 1)
1.78 markus 358: options.escape_char = (u_char) optarg[0];
1.31 markus 359: else if (strcmp(optarg, "none") == 0)
1.119 stevesk 360: options.escape_char = SSH_ESCAPECHAR_NONE;
1.31 markus 361: else {
1.128 fgsch 362: fprintf(stderr, "Bad escape character '%s'.\n",
363: optarg);
1.257 dtucker 364: exit(255);
1.31 markus 365: }
366: break;
367: case 'c':
1.49 markus 368: if (ciphers_valid(optarg)) {
369: /* SSH2 only */
370: options.ciphers = xstrdup(optarg);
1.224 markus 371: options.cipher = SSH_CIPHER_INVALID;
1.49 markus 372: } else {
373: /* SSH1 only */
1.74 markus 374: options.cipher = cipher_number(optarg);
375: if (options.cipher == -1) {
1.128 fgsch 376: fprintf(stderr,
377: "Unknown cipher type '%s'\n",
378: optarg);
1.257 dtucker 379: exit(255);
1.49 markus 380: }
1.128 fgsch 381: if (options.cipher == SSH_CIPHER_3DES)
1.74 markus 382: options.ciphers = "3des-cbc";
1.128 fgsch 383: else if (options.cipher == SSH_CIPHER_BLOWFISH)
1.74 markus 384: options.ciphers = "blowfish-cbc";
1.128 fgsch 385: else
1.74 markus 386: options.ciphers = (char *)-1;
1.95 markus 387: }
388: break;
389: case 'm':
390: if (mac_valid(optarg))
391: options.macs = xstrdup(optarg);
392: else {
1.128 fgsch 393: fprintf(stderr, "Unknown mac type '%s'\n",
394: optarg);
1.257 dtucker 395: exit(255);
1.31 markus 396: }
397: break;
1.214 djm 398: case 'M':
1.242 djm 399: if (options.control_master == SSHCTL_MASTER_YES)
400: options.control_master = SSHCTL_MASTER_ASK;
401: else
402: options.control_master = SSHCTL_MASTER_YES;
1.214 djm 403: break;
1.31 markus 404: case 'p':
1.113 stevesk 405: options.port = a2port(optarg);
406: if (options.port == 0) {
1.109 markus 407: fprintf(stderr, "Bad port '%s'\n", optarg);
1.257 dtucker 408: exit(255);
1.109 markus 409: }
1.31 markus 410: break;
411: case 'l':
412: options.user = optarg;
413: break;
1.141 stevesk 414:
415: case 'L':
1.232 djm 416: if (parse_forward(&fwd, optarg))
417: add_local_forward(&options, &fwd);
418: else {
1.128 fgsch 419: fprintf(stderr,
1.232 djm 420: "Bad local forwarding specification '%s'\n",
1.128 fgsch 421: optarg);
1.257 dtucker 422: exit(255);
1.31 markus 423: }
1.232 djm 424: break;
425:
426: case 'R':
427: if (parse_forward(&fwd, optarg)) {
428: add_remote_forward(&options, &fwd);
429: } else {
1.128 fgsch 430: fprintf(stderr,
1.232 djm 431: "Bad remote forwarding specification "
432: "'%s'\n", optarg);
1.257 dtucker 433: exit(255);
1.31 markus 434: }
435: break;
1.108 markus 436:
437: case 'D':
1.232 djm 438: cp = p = xstrdup(optarg);
439: memset(&fwd, '\0', sizeof(fwd));
440: fwd.connect_host = "socks";
441: if ((fwd.listen_host = hpdelim(&cp)) == NULL) {
442: fprintf(stderr, "Bad dynamic forwarding "
443: "specification '%.100s'\n", optarg);
1.257 dtucker 444: exit(255);
1.232 djm 445: }
446: if (cp != NULL) {
447: fwd.listen_port = a2port(cp);
448: fwd.listen_host = cleanhostname(fwd.listen_host);
449: } else {
450: fwd.listen_port = a2port(fwd.listen_host);
1.249 djm 451: fwd.listen_host = NULL;
1.232 djm 452: }
453:
454: if (fwd.listen_port == 0) {
1.128 fgsch 455: fprintf(stderr, "Bad dynamic port '%s'\n",
456: optarg);
1.257 dtucker 457: exit(255);
1.109 markus 458: }
1.232 djm 459: add_local_forward(&options, &fwd);
460: xfree(p);
1.108 markus 461: break;
462:
1.31 markus 463: case 'C':
464: options.compression = 1;
465: break;
1.45 markus 466: case 'N':
467: no_shell_flag = 1;
468: no_tty_flag = 1;
469: break;
470: case 'T':
471: no_tty_flag = 1;
472: break;
1.31 markus 473: case 'o':
474: dummy = 1;
1.205 markus 475: line = xstrdup(optarg);
1.128 fgsch 476: if (process_config_line(&options, host ? host : "",
1.205 markus 477: line, "command-line", 0, &dummy) != 0)
1.257 dtucker 478: exit(255);
1.205 markus 479: xfree(line);
1.31 markus 480: break;
1.85 djm 481: case 's':
482: subsystem_flag = 1;
1.117 markus 483: break;
1.214 djm 484: case 'S':
485: if (options.control_path != NULL)
486: free(options.control_path);
487: options.control_path = xstrdup(optarg);
488: break;
1.117 markus 489: case 'b':
490: options.bind_address = optarg;
1.85 djm 491: break;
1.139 markus 492: case 'F':
493: config = optarg;
494: break;
1.31 markus 495: default:
496: usage();
1.1 deraadt 497: }
1.31 markus 498: }
499:
1.128 fgsch 500: ac -= optind;
501: av += optind;
502:
503: if (ac > 0 && !host && **av != '-') {
1.188 markus 504: if (strrchr(*av, '@')) {
1.128 fgsch 505: p = xstrdup(*av);
1.188 markus 506: cp = strrchr(p, '@');
1.128 fgsch 507: if (cp == NULL || cp == p)
508: usage();
509: options.user = p;
510: *cp = '\0';
511: host = ++cp;
512: } else
513: host = *av;
1.189 millert 514: if (ac > 1) {
515: optind = optreset = 1;
1.128 fgsch 516: goto again;
517: }
1.189 millert 518: ac--, av++;
1.128 fgsch 519: }
520:
1.31 markus 521: /* Check that we got a host name. */
522: if (!host)
523: usage();
524:
1.54 markus 525: SSLeay_add_all_algorithms();
1.72 markus 526: ERR_load_crypto_strings();
1.31 markus 527:
528: /* Initialize the command to execute on remote host. */
529: buffer_init(&command);
1.1 deraadt 530:
1.33 markus 531: /*
532: * Save the command to execute on the remote host in a buffer. There
533: * is no limit on the length of the command, except by the maximum
534: * packet size. Also sets the tty flag if there is no command.
535: */
1.128 fgsch 536: if (!ac) {
1.31 markus 537: /* No command specified - execute shell on a tty. */
538: tty_flag = 1;
1.85 djm 539: if (subsystem_flag) {
1.128 fgsch 540: fprintf(stderr,
541: "You must specify a subsystem to invoke.\n");
1.85 djm 542: usage();
543: }
1.31 markus 544: } else {
1.128 fgsch 545: /* A command has been specified. Store it into the buffer. */
546: for (i = 0; i < ac; i++) {
547: if (i)
1.31 markus 548: buffer_append(&command, " ", 1);
549: buffer_append(&command, av[i], strlen(av[i]));
550: }
551: }
552:
553: /* Cannot fork to background if no command. */
1.63 markus 554: if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag)
1.31 markus 555: fatal("Cannot fork into background without a command to execute.");
556:
557: /* Allocate a tty by default if no command specified. */
558: if (buffer_len(&command) == 0)
559: tty_flag = 1;
560:
1.180 deraadt 561: /* Force no tty */
1.75 markus 562: if (no_tty_flag)
563: tty_flag = 0;
1.31 markus 564: /* Do not allocate a tty if stdin is not a tty. */
1.236 djm 565: if ((!isatty(fileno(stdin)) || stdin_null_flag) && !force_tty_flag) {
1.31 markus 566: if (tty_flag)
1.191 itojun 567: logit("Pseudo-terminal will not be allocated because stdin is not a terminal.");
1.31 markus 568: tty_flag = 0;
569: }
1.45 markus 570:
1.101 markus 571: /*
572: * Initialize "log" output. Since we are the client all output
573: * actually goes to stderr.
574: */
1.111 markus 575: log_init(av[0], options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level,
576: SYSLOG_FACILITY_USER, 1);
1.31 markus 577:
1.139 markus 578: /*
579: * Read per-user configuration file. Ignore the system wide config
580: * file if the user specifies a config file on the command line.
581: */
582: if (config != NULL) {
1.211 djm 583: if (!read_config_file(config, host, &options, 0))
1.142 stevesk 584: fatal("Can't open user config file %.100s: "
585: "%.100s", config, strerror(errno));
1.139 markus 586: } else {
587: snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir,
588: _PATH_SSH_USER_CONFFILE);
1.210 djm 589: (void)read_config_file(buf, host, &options, 1);
1.139 markus 590:
1.145 markus 591: /* Read systemwide configuration file after use config. */
1.223 deraadt 592: (void)read_config_file(_PATH_HOST_CONFIG_FILE, host,
1.210 djm 593: &options, 0);
1.139 markus 594: }
1.31 markus 595:
596: /* Fill configuration defaults. */
597: fill_default_options(&options);
598:
1.196 djm 599: channel_set_af(options.address_family);
600:
1.31 markus 601: /* reinit */
1.101 markus 602: log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 1);
1.31 markus 603:
604: if (options.user == NULL)
605: options.user = xstrdup(pw->pw_name);
606:
607: if (options.hostname != NULL)
608: host = options.hostname;
1.195 markus 609:
610: /* force lowercase for hostkey matching */
611: if (options.host_key_alias != NULL) {
612: for (p = options.host_key_alias; *p; p++)
613: if (isupper(*p))
614: *p = tolower(*p);
615: }
1.190 markus 616:
1.246 djm 617: /* Get default port if port has not been set. */
618: if (options.port == 0) {
619: sp = getservbyname(SSH_SERVICE_NAME, "tcp");
620: options.port = sp ? ntohs(sp->s_port) : SSH_DEFAULT_PORT;
621: }
622:
1.190 markus 623: if (options.proxy_command != NULL &&
624: strcmp(options.proxy_command, "none") == 0)
625: options.proxy_command = NULL;
1.245 djm 626: if (options.control_path != NULL &&
627: strcmp(options.control_path, "none") == 0)
628: options.control_path = NULL;
1.31 markus 629:
1.214 djm 630: if (options.control_path != NULL) {
1.241 djm 631: snprintf(buf, sizeof(buf), "%d", options.port);
632: cp = tilde_expand_filename(options.control_path,
633: original_real_uid);
634: options.control_path = percent_expand(cp, "p", buf, "h", host,
635: "r", options.user, (char *)NULL);
636: xfree(cp);
1.214 djm 637: }
1.240 djm 638: if (mux_command != 0 && options.control_path == NULL)
639: fatal("No ControlPath specified for \"-O\" command");
1.242 djm 640: if (options.control_path != NULL)
1.237 jakob 641: control_client(options.control_path);
1.214 djm 642:
1.77 markus 643: /* Open a connection to the remote host. */
1.203 djm 644: if (ssh_connect(host, &hostaddr, options.port,
1.196 djm 645: options.address_family, options.connection_attempts,
1.177 markus 646: original_effective_uid == 0 && options.use_privileged_port,
1.179 markus 647: options.proxy_command) != 0)
1.257 dtucker 648: exit(255);
1.31 markus 649:
1.33 markus 650: /*
651: * If we successfully made the connection, load the host private key
652: * in case we will need it later for combined rsa-rhosts
653: * authentication. This must be done before releasing extra
654: * privileges, because the file is only readable by root.
1.174 markus 655: * If we cannot access the private keys, load the public keys
656: * instead and try to execute the ssh-keysign helper instead.
1.33 markus 657: */
1.112 markus 658: sensitive_data.nkeys = 0;
659: sensitive_data.keys = NULL;
1.173 markus 660: sensitive_data.external_keysign = 0;
1.178 markus 661: if (options.rhosts_rsa_authentication ||
662: options.hostbased_authentication) {
1.112 markus 663: sensitive_data.nkeys = 3;
1.180 deraadt 664: sensitive_data.keys = xmalloc(sensitive_data.nkeys *
665: sizeof(Key));
1.177 markus 666:
667: PRIV_START;
1.112 markus 668: sensitive_data.keys[0] = key_load_private_type(KEY_RSA1,
1.105 markus 669: _PATH_HOST_KEY_FILE, "", NULL);
1.112 markus 670: sensitive_data.keys[1] = key_load_private_type(KEY_DSA,
671: _PATH_HOST_DSA_KEY_FILE, "", NULL);
672: sensitive_data.keys[2] = key_load_private_type(KEY_RSA,
673: _PATH_HOST_RSA_KEY_FILE, "", NULL);
1.177 markus 674: PRIV_END;
1.173 markus 675:
1.181 markus 676: if (options.hostbased_authentication == 1 &&
677: sensitive_data.keys[0] == NULL &&
1.173 markus 678: sensitive_data.keys[1] == NULL &&
679: sensitive_data.keys[2] == NULL) {
680: sensitive_data.keys[1] = key_load_public(
681: _PATH_HOST_DSA_KEY_FILE, NULL);
682: sensitive_data.keys[2] = key_load_public(
683: _PATH_HOST_RSA_KEY_FILE, NULL);
684: sensitive_data.external_keysign = 1;
685: }
1.31 markus 686: }
1.33 markus 687: /*
688: * Get rid of any extra privileges that we may have. We will no
689: * longer need them. Also, extra privileges could make it very hard
690: * to read identity files and other non-world-readable files from the
691: * user's home directory if it happens to be on a NFS volume where
692: * root is mapped to nobody.
693: */
1.225 dtucker 694: if (original_effective_uid == 0) {
695: PRIV_START;
696: permanently_set_uid(pw);
697: }
1.31 markus 698:
1.33 markus 699: /*
700: * Now that we are back to our own permissions, create ~/.ssh
1.254 djm 701: * directory if it doesn't already exist.
1.33 markus 702: */
1.138 jakob 703: snprintf(buf, sizeof buf, "%.100s%s%.100s", pw->pw_dir, strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR);
1.31 markus 704: if (stat(buf, &st) < 0)
1.57 djm 705: if (mkdir(buf, 0700) < 0)
1.31 markus 706: error("Could not create directory '%.200s'.", buf);
707:
1.104 markus 708: /* load options.identity_files */
709: load_public_identity_files();
710:
711: /* Expand ~ in known host file names. */
712: /* XXX mem-leaks: */
1.72 markus 713: options.system_hostfile =
714: tilde_expand_filename(options.system_hostfile, original_real_uid);
715: options.user_hostfile =
716: tilde_expand_filename(options.user_hostfile, original_real_uid);
717: options.system_hostfile2 =
718: tilde_expand_filename(options.system_hostfile2, original_real_uid);
719: options.user_hostfile2 =
720: tilde_expand_filename(options.user_hostfile2, original_real_uid);
1.149 markus 721:
722: signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
1.31 markus 723:
724: /* Log into the remote system. This never returns if the login fails. */
1.173 markus 725: ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr, pw);
1.31 markus 726:
1.112 markus 727: /* We no longer need the private host keys. Clear them now. */
728: if (sensitive_data.nkeys != 0) {
729: for (i = 0; i < sensitive_data.nkeys; i++) {
730: if (sensitive_data.keys[i] != NULL) {
731: /* Destroys contents safely */
732: debug3("clear hostkey %d", i);
733: key_free(sensitive_data.keys[i]);
734: sensitive_data.keys[i] = NULL;
735: }
736: }
737: xfree(sensitive_data.keys);
1.134 markus 738: }
739: for (i = 0; i < options.num_identity_files; i++) {
740: if (options.identity_files[i]) {
741: xfree(options.identity_files[i]);
742: options.identity_files[i] = NULL;
743: }
744: if (options.identity_keys[i]) {
745: key_free(options.identity_keys[i]);
746: options.identity_keys[i] = NULL;
747: }
1.112 markus 748: }
1.31 markus 749:
1.45 markus 750: exit_status = compat20 ? ssh_session2() : ssh_session();
751: packet_close();
1.186 djm 752:
1.214 djm 753: if (options.control_path != NULL && control_fd != -1)
754: unlink(options.control_path);
755:
1.186 djm 756: /*
1.203 djm 757: * Send SIGHUP to proxy command if used. We don't wait() in
1.186 djm 758: * case it hangs and instead rely on init to reap the child
759: */
760: if (proxy_command_pid > 1)
761: kill(proxy_command_pid, SIGHUP);
762:
1.45 markus 763: return exit_status;
764: }
765:
1.126 itojun 766: static void
1.70 markus 767: ssh_init_forwarding(void)
768: {
1.86 markus 769: int success = 0;
1.70 markus 770: int i;
1.86 markus 771:
1.70 markus 772: /* Initiate local TCP/IP port forwardings. */
773: for (i = 0; i < options.num_local_forwards; i++) {
1.232 djm 774: debug("Local connections to %.200s:%d forwarded to remote "
775: "address %.200s:%d",
1.234 deraadt 776: (options.local_forwards[i].listen_host == NULL) ?
777: (options.gateway_ports ? "*" : "LOCALHOST") :
1.232 djm 778: options.local_forwards[i].listen_host,
779: options.local_forwards[i].listen_port,
780: options.local_forwards[i].connect_host,
781: options.local_forwards[i].connect_port);
1.158 markus 782: success += channel_setup_local_fwd_listener(
1.232 djm 783: options.local_forwards[i].listen_host,
784: options.local_forwards[i].listen_port,
785: options.local_forwards[i].connect_host,
786: options.local_forwards[i].connect_port,
1.70 markus 787: options.gateway_ports);
788: }
1.86 markus 789: if (i > 0 && success == 0)
790: error("Could not request local forwarding.");
1.70 markus 791:
792: /* Initiate remote TCP/IP port forwardings. */
793: for (i = 0; i < options.num_remote_forwards; i++) {
1.232 djm 794: debug("Remote connections from %.200s:%d forwarded to "
795: "local address %.200s:%d",
1.248 djm 796: (options.remote_forwards[i].listen_host == NULL) ?
1.253 djm 797: "LOCALHOST" : options.remote_forwards[i].listen_host,
1.232 djm 798: options.remote_forwards[i].listen_port,
799: options.remote_forwards[i].connect_host,
800: options.remote_forwards[i].connect_port);
1.70 markus 801: channel_request_remote_forwarding(
1.232 djm 802: options.remote_forwards[i].listen_host,
803: options.remote_forwards[i].listen_port,
804: options.remote_forwards[i].connect_host,
805: options.remote_forwards[i].connect_port);
1.70 markus 806: }
807: }
808:
1.126 itojun 809: static void
1.70 markus 810: check_agent_present(void)
811: {
812: if (options.forward_agent) {
1.254 djm 813: /* Clear agent forwarding if we don't have an agent. */
1.185 stevesk 814: if (!ssh_agent_present())
1.70 markus 815: options.forward_agent = 0;
816: }
817: }
818:
1.126 itojun 819: static int
1.45 markus 820: ssh_session(void)
821: {
822: int type;
823: int interactive = 0;
824: int have_tty = 0;
825: struct winsize ws;
826: char *cp;
1.243 djm 827: const char *display;
1.45 markus 828:
1.31 markus 829: /* Enable compression if requested. */
830: if (options.compression) {
831: debug("Requesting compression at level %d.", options.compression_level);
832:
833: if (options.compression_level < 1 || options.compression_level > 9)
834: fatal("Compression level must be from 1 (fast) to 9 (slow, best).");
835:
836: /* Send the request. */
837: packet_start(SSH_CMSG_REQUEST_COMPRESSION);
838: packet_put_int(options.compression_level);
839: packet_send();
840: packet_write_wait();
1.156 markus 841: type = packet_read();
1.31 markus 842: if (type == SSH_SMSG_SUCCESS)
843: packet_start_compression(options.compression_level);
844: else if (type == SSH_SMSG_FAILURE)
1.191 itojun 845: logit("Warning: Remote host refused compression.");
1.31 markus 846: else
847: packet_disconnect("Protocol error waiting for compression response.");
848: }
849: /* Allocate a pseudo tty if appropriate. */
850: if (tty_flag) {
851: debug("Requesting pty.");
852:
853: /* Start the packet. */
854: packet_start(SSH_CMSG_REQUEST_PTY);
855:
856: /* Store TERM in the packet. There is no limit on the
857: length of the string. */
858: cp = getenv("TERM");
859: if (!cp)
860: cp = "";
1.124 markus 861: packet_put_cstring(cp);
1.31 markus 862:
863: /* Store window size in the packet. */
864: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
865: memset(&ws, 0, sizeof(ws));
866: packet_put_int(ws.ws_row);
867: packet_put_int(ws.ws_col);
868: packet_put_int(ws.ws_xpixel);
869: packet_put_int(ws.ws_ypixel);
870:
871: /* Store tty modes in the packet. */
1.115 stevesk 872: tty_make_modes(fileno(stdin), NULL);
1.31 markus 873:
874: /* Send the packet, and wait for it to leave. */
875: packet_send();
876: packet_write_wait();
877:
878: /* Read response from the server. */
1.156 markus 879: type = packet_read();
1.43 markus 880: if (type == SSH_SMSG_SUCCESS) {
1.31 markus 881: interactive = 1;
1.45 markus 882: have_tty = 1;
1.43 markus 883: } else if (type == SSH_SMSG_FAILURE)
1.191 itojun 884: logit("Warning: Remote host failed or refused to allocate a pseudo tty.");
1.31 markus 885: else
886: packet_disconnect("Protocol error waiting for pty request response.");
887: }
888: /* Request X11 forwarding if enabled and DISPLAY is set. */
1.243 djm 889: display = getenv("DISPLAY");
890: if (options.forward_x11 && display != NULL) {
1.150 stevesk 891: char *proto, *data;
1.50 markus 892: /* Get reasonable local authentication information. */
1.243 djm 893: client_x11_get_proto(display, options.xauth_location,
894: options.forward_x11_trusted, &proto, &data);
1.50 markus 895: /* Request forwarding with authentication spoofing. */
1.31 markus 896: debug("Requesting X11 forwarding with authentication spoofing.");
1.243 djm 897: x11_request_forwarding_with_spoofing(0, display, proto, data);
1.31 markus 898:
899: /* Read response from the server. */
1.156 markus 900: type = packet_read();
1.31 markus 901: if (type == SSH_SMSG_SUCCESS) {
902: interactive = 1;
1.50 markus 903: } else if (type == SSH_SMSG_FAILURE) {
1.191 itojun 904: logit("Warning: Remote host denied X11 forwarding.");
1.50 markus 905: } else {
1.31 markus 906: packet_disconnect("Protocol error waiting for X11 forwarding");
1.50 markus 907: }
1.31 markus 908: }
909: /* Tell the packet module whether this is an interactive session. */
1.80 markus 910: packet_set_interactive(interactive);
1.31 markus 911:
912: /* Request authentication agent forwarding if appropriate. */
1.70 markus 913: check_agent_present();
914:
1.31 markus 915: if (options.forward_agent) {
916: debug("Requesting authentication agent forwarding.");
917: auth_request_forwarding();
918:
919: /* Read response from the server. */
1.156 markus 920: type = packet_read();
1.155 markus 921: packet_check_eom();
1.31 markus 922: if (type != SSH_SMSG_SUCCESS)
1.191 itojun 923: logit("Warning: Remote host denied authentication agent forwarding.");
1.31 markus 924: }
925:
1.70 markus 926: /* Initiate port forwardings. */
927: ssh_init_forwarding();
1.34 markus 928:
929: /* If requested, let ssh continue in the background. */
1.48 markus 930: if (fork_after_authentication_flag)
1.34 markus 931: if (daemon(1, 1) < 0)
932: fatal("daemon() failed: %.200s", strerror(errno));
1.31 markus 933:
1.33 markus 934: /*
935: * If a command was specified on the command line, execute the
936: * command now. Otherwise request the server to start a shell.
937: */
1.31 markus 938: if (buffer_len(&command) > 0) {
939: int len = buffer_len(&command);
940: if (len > 900)
941: len = 900;
1.152 stevesk 942: debug("Sending command: %.*s", len, (u_char *)buffer_ptr(&command));
1.31 markus 943: packet_start(SSH_CMSG_EXEC_CMD);
944: packet_put_string(buffer_ptr(&command), buffer_len(&command));
945: packet_send();
946: packet_write_wait();
947: } else {
948: debug("Requesting shell.");
949: packet_start(SSH_CMSG_EXEC_SHELL);
950: packet_send();
951: packet_write_wait();
952: }
953:
954: /* Enter the interactive session. */
1.119 stevesk 955: return client_loop(have_tty, tty_flag ?
956: options.escape_char : SSH_ESCAPECHAR_NONE, 0);
1.45 markus 957: }
958:
1.126 itojun 959: static void
1.214 djm 960: ssh_subsystem_reply(int type, u_int32_t seq, void *ctxt)
1.89 markus 961: {
962: int id, len;
963:
964: id = packet_get_int();
965: len = buffer_len(&command);
1.100 markus 966: if (len > 900)
967: len = 900;
1.155 markus 968: packet_check_eom();
1.89 markus 969: if (type == SSH2_MSG_CHANNEL_FAILURE)
970: fatal("Request for subsystem '%.*s' failed on channel %d",
1.152 stevesk 971: len, (u_char *)buffer_ptr(&command), id);
1.170 markus 972: }
973:
974: void
1.206 markus 975: client_global_request_reply_fwd(int type, u_int32_t seq, void *ctxt)
1.170 markus 976: {
977: int i;
978:
979: i = client_global_request_id++;
1.206 markus 980: if (i >= options.num_remote_forwards)
1.170 markus 981: return;
982: debug("remote forward %s for: listen %d, connect %s:%d",
983: type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
1.232 djm 984: options.remote_forwards[i].listen_port,
985: options.remote_forwards[i].connect_host,
986: options.remote_forwards[i].connect_port);
1.170 markus 987: if (type == SSH2_MSG_REQUEST_FAILURE)
1.232 djm 988: logit("Warning: remote port forwarding failed for listen "
989: "port %d", options.remote_forwards[i].listen_port);
1.89 markus 990: }
991:
1.126 itojun 992: static void
1.214 djm 993: ssh_control_listener(void)
1.45 markus 994: {
1.214 djm 995: struct sockaddr_un addr;
996: mode_t old_umask;
1.223 deraadt 997:
1.242 djm 998: if (options.control_path == NULL ||
999: options.control_master == SSHCTL_MASTER_NO)
1.214 djm 1000: return;
1001:
1.242 djm 1002: debug("setting up multiplex master socket");
1003:
1.214 djm 1004: memset(&addr, '\0', sizeof(addr));
1005: addr.sun_family = AF_UNIX;
1006: addr.sun_len = offsetof(struct sockaddr_un, sun_path) +
1007: strlen(options.control_path) + 1;
1008:
1009: if (strlcpy(addr.sun_path, options.control_path,
1010: sizeof(addr.sun_path)) >= sizeof(addr.sun_path))
1011: fatal("ControlPath too long");
1012:
1013: if ((control_fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0)
1.252 stevesk 1014: fatal("%s socket(): %s", __func__, strerror(errno));
1.214 djm 1015:
1016: old_umask = umask(0177);
1017: if (bind(control_fd, (struct sockaddr*)&addr, addr.sun_len) == -1) {
1018: control_fd = -1;
1.238 djm 1019: if (errno == EINVAL || errno == EADDRINUSE)
1.214 djm 1020: fatal("ControlSocket %s already exists",
1021: options.control_path);
1022: else
1.252 stevesk 1023: fatal("%s bind(): %s", __func__, strerror(errno));
1.214 djm 1024: }
1025: umask(old_umask);
1.80 markus 1026:
1.214 djm 1027: if (listen(control_fd, 64) == -1)
1.252 stevesk 1028: fatal("%s listen(): %s", __func__, strerror(errno));
1.31 markus 1029:
1.214 djm 1030: set_nonblock(control_fd);
1031: }
1.45 markus 1032:
1.214 djm 1033: /* request pty/x11/agent/tcpfwd/shell for channel */
1034: static void
1035: ssh_session2_setup(int id, void *arg)
1036: {
1.215 djm 1037: extern char **environ;
1.243 djm 1038: const char *display;
1039: int interactive = tty_flag;
1.215 djm 1040:
1.248 djm 1041: display = getenv("DISPLAY");
1.243 djm 1042: if (options.forward_x11 && display != NULL) {
1.150 stevesk 1043: char *proto, *data;
1.50 markus 1044: /* Get reasonable local authentication information. */
1.243 djm 1045: client_x11_get_proto(display, options.xauth_location,
1046: options.forward_x11_trusted, &proto, &data);
1.50 markus 1047: /* Request forwarding with authentication spoofing. */
1048: debug("Requesting X11 forwarding with authentication spoofing.");
1.243 djm 1049: x11_request_forwarding_with_spoofing(id, display, proto, data);
1.80 markus 1050: interactive = 1;
1.50 markus 1051: /* XXX wait for reply */
1052: }
1053:
1.70 markus 1054: check_agent_present();
1055: if (options.forward_agent) {
1056: debug("Requesting authentication agent forwarding.");
1057: channel_request_start(id, "auth-agent-req@openssh.com", 0);
1058: packet_send();
1.212 djm 1059: }
1060:
1.256 reyk 1061: if (options.tun_open != SSH_TUNMODE_NO) {
1.255 reyk 1062: Channel *c;
1063: int fd;
1064:
1065: debug("Requesting tun.");
1.256 reyk 1066: if ((fd = tun_open(options.tun_local,
1067: options.tun_open)) >= 0) {
1.255 reyk 1068: c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1,
1069: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT,
1070: 0, "tun", 1);
1071: c->datagram = 1;
1072: packet_start(SSH2_MSG_CHANNEL_OPEN);
1073: packet_put_cstring("tun@openssh.com");
1074: packet_put_int(c->self);
1075: packet_put_int(c->local_window_max);
1076: packet_put_int(c->local_maxpacket);
1.256 reyk 1077: packet_put_int(options.tun_open);
1.255 reyk 1078: packet_put_int(options.tun_remote);
1079: packet_send();
1080: }
1081: }
1082:
1.214 djm 1083: client_session2_setup(id, tty_flag, subsystem_flag, getenv("TERM"),
1.215 djm 1084: NULL, fileno(stdin), &command, environ, &ssh_subsystem_reply);
1.90 markus 1085:
1.80 markus 1086: packet_set_interactive(interactive);
1.45 markus 1087: }
1088:
1.143 markus 1089: /* open new channel for a session */
1.126 itojun 1090: static int
1.143 markus 1091: ssh_session2_open(void)
1.45 markus 1092: {
1.118 markus 1093: Channel *c;
1094: int window, packetmax, in, out, err;
1.60 markus 1095:
1.62 markus 1096: if (stdin_null_flag) {
1.93 itojun 1097: in = open(_PATH_DEVNULL, O_RDONLY);
1.62 markus 1098: } else {
1099: in = dup(STDIN_FILENO);
1100: }
1.60 markus 1101: out = dup(STDOUT_FILENO);
1102: err = dup(STDERR_FILENO);
1.45 markus 1103:
1104: if (in < 0 || out < 0 || err < 0)
1.62 markus 1105: fatal("dup() in/out/err failed");
1.45 markus 1106:
1.69 markus 1107: /* enable nonblocking unless tty */
1108: if (!isatty(in))
1109: set_nonblock(in);
1110: if (!isatty(out))
1111: set_nonblock(out);
1112: if (!isatty(err))
1113: set_nonblock(err);
1114:
1.65 markus 1115: window = CHAN_SES_WINDOW_DEFAULT;
1116: packetmax = CHAN_SES_PACKET_DEFAULT;
1.164 markus 1117: if (tty_flag) {
1118: window >>= 1;
1119: packetmax >>= 1;
1.45 markus 1120: }
1.118 markus 1121: c = channel_new(
1.45 markus 1122: "session", SSH_CHANNEL_OPENING, in, out, err,
1.65 markus 1123: window, packetmax, CHAN_EXTENDED_WRITE,
1.192 markus 1124: "client-session", /*nonblock*/0);
1.45 markus 1125:
1.143 markus 1126: debug3("ssh_session2_open: channel_new: %d", c->self);
1.106 markus 1127:
1.122 markus 1128: channel_send_open(c->self);
1.143 markus 1129: if (!no_shell_flag)
1.214 djm 1130: channel_register_confirm(c->self, ssh_session2_setup, NULL);
1.106 markus 1131:
1.118 markus 1132: return c->self;
1.106 markus 1133: }
1134:
1.126 itojun 1135: static int
1.106 markus 1136: ssh_session2(void)
1137: {
1.143 markus 1138: int id = -1;
1.106 markus 1139:
1140: /* XXX should be pre-session */
1141: ssh_init_forwarding();
1.214 djm 1142: ssh_control_listener();
1.106 markus 1143:
1.143 markus 1144: if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN))
1145: id = ssh_session2_open();
1.255 reyk 1146:
1147: /* Execute a local command */
1148: if (options.local_command != NULL &&
1149: options.permit_local_command)
1150: ssh_local_cmd(options.local_command);
1.106 markus 1151:
1152: /* If requested, let ssh continue in the background. */
1153: if (fork_after_authentication_flag)
1154: if (daemon(1, 1) < 0)
1155: fatal("daemon() failed: %.200s", strerror(errno));
1.31 markus 1156:
1.119 stevesk 1157: return client_loop(tty_flag, tty_flag ?
1158: options.escape_char : SSH_ESCAPECHAR_NONE, id);
1.72 markus 1159: }
1160:
1.126 itojun 1161: static void
1.104 markus 1162: load_public_identity_files(void)
1163: {
1164: char *filename;
1.167 markus 1165: int i = 0;
1.104 markus 1166: Key *public;
1.167 markus 1167: #ifdef SMARTCARD
1168: Key **keys;
1.104 markus 1169:
1.133 markus 1170: if (options.smartcard_device != NULL &&
1.167 markus 1171: options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
1172: (keys = sc_get_keys(options.smartcard_device, NULL)) != NULL ) {
1173: int count = 0;
1174: for (i = 0; keys[i] != NULL; i++) {
1175: count++;
1176: memmove(&options.identity_files[1], &options.identity_files[0],
1177: sizeof(char *) * (SSH_MAX_IDENTITY_FILES - 1));
1178: memmove(&options.identity_keys[1], &options.identity_keys[0],
1179: sizeof(Key *) * (SSH_MAX_IDENTITY_FILES - 1));
1180: options.num_identity_files++;
1181: options.identity_keys[0] = keys[i];
1.194 markus 1182: options.identity_files[0] = sc_get_key_label(keys[i]);
1.167 markus 1183: }
1.168 markus 1184: if (options.num_identity_files > SSH_MAX_IDENTITY_FILES)
1185: options.num_identity_files = SSH_MAX_IDENTITY_FILES;
1.167 markus 1186: i = count;
1187: xfree(keys);
1.127 markus 1188: }
1.136 jakob 1189: #endif /* SMARTCARD */
1.131 millert 1190: for (; i < options.num_identity_files; i++) {
1191: filename = tilde_expand_filename(options.identity_files[i],
1192: original_real_uid);
1193: public = key_load_public(filename, NULL);
1194: debug("identity file %s type %d", filename,
1195: public ? public->type : -1);
1196: xfree(options.identity_files[i]);
1197: options.identity_files[i] = filename;
1198: options.identity_keys[i] = public;
1199: }
1.214 djm 1200: }
1201:
1202: static void
1203: control_client_sighandler(int signo)
1204: {
1205: control_client_terminate = signo;
1206: }
1207:
1208: static void
1209: control_client_sigrelay(int signo)
1210: {
1211: if (control_server_pid > 1)
1212: kill(control_server_pid, signo);
1213: }
1214:
1.220 djm 1215: static int
1216: env_permitted(char *env)
1217: {
1218: int i;
1219: char name[1024], *cp;
1220:
1221: strlcpy(name, env, sizeof(name));
1222: if ((cp = strchr(name, '=')) == NULL)
1223: return (0);
1224:
1225: *cp = '\0';
1226:
1227: for (i = 0; i < options.num_send_env; i++)
1228: if (match_pattern(name, options.send_env[i]))
1229: return (1);
1230:
1231: return (0);
1232: }
1233:
1.214 djm 1234: static void
1235: control_client(const char *path)
1236: {
1237: struct sockaddr_un addr;
1.228 djm 1238: int i, r, fd, sock, exitval, num_env;
1.214 djm 1239: Buffer m;
1.229 djm 1240: char *term;
1.215 djm 1241: extern char **environ;
1.229 djm 1242: u_int flags;
1.242 djm 1243:
1244: if (mux_command == 0)
1245: mux_command = SSHMUX_COMMAND_OPEN;
1246:
1247: switch (options.control_master) {
1248: case SSHCTL_MASTER_AUTO:
1249: case SSHCTL_MASTER_AUTO_ASK:
1250: debug("auto-mux: Trying existing master");
1251: /* FALLTHROUGH */
1252: case SSHCTL_MASTER_NO:
1253: break;
1254: default:
1255: return;
1256: }
1.228 djm 1257:
1.214 djm 1258: memset(&addr, '\0', sizeof(addr));
1259: addr.sun_family = AF_UNIX;
1260: addr.sun_len = offsetof(struct sockaddr_un, sun_path) +
1261: strlen(path) + 1;
1262:
1263: if (strlcpy(addr.sun_path, path,
1264: sizeof(addr.sun_path)) >= sizeof(addr.sun_path))
1265: fatal("ControlPath too long");
1266:
1267: if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) < 0)
1268: fatal("%s socket(): %s", __func__, strerror(errno));
1269:
1.237 jakob 1270: if (connect(sock, (struct sockaddr*)&addr, addr.sun_len) == -1) {
1.240 djm 1271: if (mux_command != SSHMUX_COMMAND_OPEN) {
1272: fatal("Control socket connect(%.100s): %s", path,
1273: strerror(errno));
1274: }
1.239 djm 1275: if (errno == ENOENT)
1276: debug("Control socket \"%.100s\" does not exist", path);
1277: else {
1278: error("Control socket connect(%.100s): %s", path,
1279: strerror(errno));
1280: }
1.237 jakob 1281: close(sock);
1282: return;
1283: }
1.248 djm 1284:
1.237 jakob 1285: if (stdin_null_flag) {
1286: if ((fd = open(_PATH_DEVNULL, O_RDONLY)) == -1)
1287: fatal("open(/dev/null): %s", strerror(errno));
1288: if (dup2(fd, STDIN_FILENO) == -1)
1289: fatal("dup2: %s", strerror(errno));
1290: if (fd > STDERR_FILENO)
1291: close(fd);
1292: }
1.248 djm 1293:
1.247 djm 1294: term = getenv("TERM");
1.229 djm 1295:
1296: flags = 0;
1297: if (tty_flag)
1298: flags |= SSHMUX_FLAG_TTY;
1299: if (subsystem_flag)
1300: flags |= SSHMUX_FLAG_SUBSYS;
1.247 djm 1301: if (options.forward_x11)
1302: flags |= SSHMUX_FLAG_X11_FWD;
1303: if (options.forward_agent)
1304: flags |= SSHMUX_FLAG_AGENT_FWD;
1.214 djm 1305:
1306: buffer_init(&m);
1307:
1.229 djm 1308: /* Send our command to server */
1309: buffer_put_int(&m, mux_command);
1310: buffer_put_int(&m, flags);
1.247 djm 1311: if (ssh_msg_send(sock, SSHMUX_VER, &m) == -1)
1.229 djm 1312: fatal("%s: msg_send", __func__);
1313: buffer_clear(&m);
1314:
1315: /* Get authorisation status and PID of controlee */
1.214 djm 1316: if (ssh_msg_recv(sock, &m) == -1)
1317: fatal("%s: msg_recv", __func__);
1.247 djm 1318: if (buffer_get_char(&m) != SSHMUX_VER)
1.214 djm 1319: fatal("%s: wrong version", __func__);
1.216 djm 1320: if (buffer_get_int(&m) != 1)
1321: fatal("Connection to master denied");
1.214 djm 1322: control_server_pid = buffer_get_int(&m);
1323:
1324: buffer_clear(&m);
1325:
1.229 djm 1326: switch (mux_command) {
1327: case SSHMUX_COMMAND_ALIVE_CHECK:
1.234 deraadt 1328: fprintf(stderr, "Master running (pid=%d)\r\n",
1.229 djm 1329: control_server_pid);
1330: exit(0);
1331: case SSHMUX_COMMAND_TERMINATE:
1332: fprintf(stderr, "Exit request sent.\r\n");
1333: exit(0);
1334: case SSHMUX_COMMAND_OPEN:
1335: /* continue below */
1336: break;
1337: default:
1338: fatal("silly mux_command %d", mux_command);
1339: }
1340:
1341: /* SSHMUX_COMMAND_OPEN */
1.247 djm 1342: buffer_put_cstring(&m, term ? term : "");
1.214 djm 1343: buffer_append(&command, "\0", 1);
1344: buffer_put_cstring(&m, buffer_ptr(&command));
1.215 djm 1345:
1.220 djm 1346: if (options.num_send_env == 0 || environ == NULL) {
1347: buffer_put_int(&m, 0);
1.223 deraadt 1348: } else {
1.220 djm 1349: /* Pass environment */
1350: num_env = 0;
1351: for (i = 0; environ[i] != NULL; i++)
1352: if (env_permitted(environ[i]))
1353: num_env++; /* Count */
1.223 deraadt 1354:
1.220 djm 1355: buffer_put_int(&m, num_env);
1356:
1.222 dtucker 1357: for (i = 0; environ[i] != NULL && num_env >= 0; i++)
1358: if (env_permitted(environ[i])) {
1359: num_env--;
1.220 djm 1360: buffer_put_cstring(&m, environ[i]);
1.222 dtucker 1361: }
1.220 djm 1362: }
1.214 djm 1363:
1.247 djm 1364: if (ssh_msg_send(sock, SSHMUX_VER, &m) == -1)
1.214 djm 1365: fatal("%s: msg_send", __func__);
1366:
1367: mm_send_fd(sock, STDIN_FILENO);
1368: mm_send_fd(sock, STDOUT_FILENO);
1369: mm_send_fd(sock, STDERR_FILENO);
1370:
1371: /* Wait for reply, so master has a chance to gather ttymodes */
1372: buffer_clear(&m);
1373: if (ssh_msg_recv(sock, &m) == -1)
1374: fatal("%s: msg_recv", __func__);
1.247 djm 1375: if (buffer_get_char(&m) != SSHMUX_VER)
1.229 djm 1376: fatal("%s: wrong version", __func__);
1.214 djm 1377: buffer_free(&m);
1.218 djm 1378:
1.226 djm 1379: signal(SIGHUP, control_client_sighandler);
1.218 djm 1380: signal(SIGINT, control_client_sighandler);
1381: signal(SIGTERM, control_client_sighandler);
1382: signal(SIGWINCH, control_client_sigrelay);
1.214 djm 1383:
1384: if (tty_flag)
1385: enter_raw_mode();
1386:
1387: /* Stick around until the controlee closes the client_fd */
1388: exitval = 0;
1389: for (;!control_client_terminate;) {
1390: r = read(sock, &exitval, sizeof(exitval));
1391: if (r == 0) {
1392: debug2("Received EOF from master");
1393: break;
1394: }
1395: if (r > 0)
1396: debug2("Received exit status from master %d", exitval);
1397: if (r == -1 && errno != EINTR)
1398: fatal("%s: read %s", __func__, strerror(errno));
1399: }
1400:
1401: if (control_client_terminate)
1402: debug2("Exiting on signal %d", control_client_terminate);
1403:
1404: close(sock);
1405:
1406: leave_raw_mode();
1407:
1408: if (tty_flag && options.log_level != SYSLOG_LEVEL_QUIET)
1409: fprintf(stderr, "Connection to master closed.\r\n");
1410:
1411: exit(exitval);
1.1 deraadt 1412: }
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