Annotation of src/usr.bin/ssh/ssh.c, Revision 1.242
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"
1.242 ! djm 43: RCSID("$OpenBSD: ssh.c,v 1.241 2005/06/06 11:20:36 djm Exp $");
1.49 markus 44:
45: #include <openssl/evp.h>
1.72 markus 46: #include <openssl/err.h>
1.1 deraadt 47:
1.84 markus 48: #include "ssh.h"
49: #include "ssh1.h"
50: #include "ssh2.h"
51: #include "compat.h"
52: #include "cipher.h"
1.1 deraadt 53: #include "xmalloc.h"
54: #include "packet.h"
55: #include "buffer.h"
1.214 djm 56: #include "bufaux.h"
1.123 markus 57: #include "channels.h"
1.49 markus 58: #include "key.h"
1.58 markus 59: #include "authfd.h"
1.49 markus 60: #include "authfile.h"
1.83 markus 61: #include "pathnames.h"
1.214 djm 62: #include "dispatch.h"
1.81 markus 63: #include "clientloop.h"
1.84 markus 64: #include "log.h"
65: #include "readconf.h"
66: #include "sshconnect.h"
67: #include "misc.h"
1.95 markus 68: #include "kex.h"
69: #include "mac.h"
1.213 deraadt 70: #include "sshpty.h"
1.212 djm 71: #include "match.h"
1.214 djm 72: #include "msg.h"
73: #include "monitor_fdpass.h"
1.225 dtucker 74: #include "uidswap.h"
1.49 markus 75:
1.127 markus 76: #ifdef SMARTCARD
77: #include "scard.h"
1.137 jakob 78: #endif
1.127 markus 79:
1.49 markus 80: extern char *__progname;
1.1 deraadt 81:
1.31 markus 82: /* Flag indicating whether debug mode is on. This can be set on the command line. */
1.1 deraadt 83: int debug_flag = 0;
84:
1.46 markus 85: /* Flag indicating whether a tty should be allocated */
1.1 deraadt 86: int tty_flag = 0;
1.79 markus 87: int no_tty_flag = 0;
88: int force_tty_flag = 0;
1.1 deraadt 89:
1.45 markus 90: /* don't exec a shell */
91: int no_shell_flag = 0;
92:
1.33 markus 93: /*
94: * Flag indicating that nothing should be read from stdin. This can be set
95: * on the command line.
96: */
1.1 deraadt 97: int stdin_null_flag = 0;
98:
1.33 markus 99: /*
100: * Flag indicating that ssh should fork after authentication. This is useful
1.172 deraadt 101: * so that the passphrase can be entered manually, and then ssh goes to the
1.33 markus 102: * background.
103: */
1.1 deraadt 104: int fork_after_authentication_flag = 0;
105:
1.33 markus 106: /*
107: * General data structure for command line options and options configurable
108: * in configuration files. See readconf.h.
109: */
1.1 deraadt 110: Options options;
111:
1.139 markus 112: /* optional user configfile */
113: char *config = NULL;
114:
1.33 markus 115: /*
116: * Name of the host we are connecting to. This is the name given on the
117: * command line, or the HostName specified for the user-supplied name in a
118: * configuration file.
119: */
1.1 deraadt 120: char *host;
121:
1.22 provos 122: /* socket address the host resolves to */
1.37 markus 123: struct sockaddr_storage hostaddr;
1.1 deraadt 124:
1.112 markus 125: /* Private host keys. */
1.173 markus 126: Sensitive sensitive_data;
1.1 deraadt 127:
1.10 dugsong 128: /* Original real UID. */
129: uid_t original_real_uid;
1.177 markus 130: uid_t original_effective_uid;
1.1 deraadt 131:
1.45 markus 132: /* command to be executed */
133: Buffer command;
134:
1.85 djm 135: /* Should we execute a command or invoke a subsystem? */
136: int subsystem_flag = 0;
137:
1.170 markus 138: /* # of replies received for global requests */
139: static int client_global_request_id = 0;
140:
1.186 djm 141: /* pid of proxycommand child process */
142: pid_t proxy_command_pid = 0;
143:
1.214 djm 144: /* fd to control socket */
145: int control_fd = -1;
146:
1.229 djm 147: /* Multiplexing control command */
1.240 djm 148: static u_int mux_command = 0;
1.229 djm 149:
1.214 djm 150: /* Only used in control client mode */
151: volatile sig_atomic_t control_client_terminate = 0;
152: u_int control_server_pid = 0;
153:
1.1 deraadt 154: /* Prints a help message to the user. This function never returns. */
155:
1.126 itojun 156: static void
1.93 itojun 157: usage(void)
1.1 deraadt 158: {
1.208 markus 159: fprintf(stderr,
1.230 jmc 160: "usage: ssh [-1246AaCfgkMNnqsTtVvXxY] [-b bind_address] [-c cipher_spec]\n"
1.233 jmc 161: " [-D port] [-e escape_char] [-F configfile]\n"
162: " [-i identity_file] [-L [bind_address:]port:host:hostport]\n"
1.232 djm 163: " [-l login_name] [-m mac_spec] [-O ctl_cmd] [-o option] [-p port]\n"
1.233 jmc 164: " [-R [bind_address:]port:host:hostport] [-S ctl_path]\n"
1.230 jmc 165: " [user@]hostname [command]\n"
1.208 markus 166: );
1.31 markus 167: exit(1);
1.1 deraadt 168: }
169:
1.126 itojun 170: static int ssh_session(void);
171: static int ssh_session2(void);
172: static void load_public_identity_files(void);
1.214 djm 173: static void control_client(const char *path);
1.45 markus 174:
1.32 deraadt 175: /*
176: * Main program for the ssh client.
177: */
1.2 provos 178: int
179: main(int ac, char **av)
1.1 deraadt 180: {
1.178 markus 181: int i, opt, exit_status;
1.205 markus 182: char *p, *cp, *line, buf[256];
1.31 markus 183: struct stat st;
1.98 markus 184: struct passwd *pw;
1.45 markus 185: int dummy;
1.144 stevesk 186: extern int optind, optreset;
187: extern char *optarg;
1.232 djm 188: Forward fwd;
1.31 markus 189:
1.33 markus 190: /*
191: * Save the original real uid. It will be needed later (uid-swapping
192: * may clobber the real uid).
193: */
1.31 markus 194: original_real_uid = getuid();
195: original_effective_uid = geteuid();
196:
1.184 stevesk 197: /*
198: * Use uid-swapping to give up root privileges for the duration of
199: * option processing. We will re-instantiate the rights when we are
200: * ready to create the privileged port, and will permanently drop
201: * them when the port has been created (actually, when the connection
202: * has been made, as we may need to create the port several times).
203: */
204: PRIV_END;
205:
1.31 markus 206: /* If we are installed setuid root be careful to not drop core. */
207: if (original_real_uid != original_effective_uid) {
208: struct rlimit rlim;
209: rlim.rlim_cur = rlim.rlim_max = 0;
210: if (setrlimit(RLIMIT_CORE, &rlim) < 0)
211: fatal("setrlimit failed: %.100s", strerror(errno));
1.1 deraadt 212: }
1.107 markus 213: /* Get user data. */
214: pw = getpwuid(original_real_uid);
215: if (!pw) {
1.191 itojun 216: logit("You don't exist, go away!");
1.107 markus 217: exit(1);
218: }
219: /* Take a copy of the returned structure. */
220: pw = pwcopy(pw);
1.31 markus 221:
1.33 markus 222: /*
223: * Set our umask to something reasonable, as some files are created
224: * with the default umask. This will make them world-readable but
225: * writable only by the owner, which is ok for all files for which we
226: * don't set the modes explicitly.
227: */
1.31 markus 228: umask(022);
229:
230: /* Initialize option structure to indicate that no values have been set. */
231: initialize_options(&options);
232:
233: /* Parse command-line arguments. */
234: host = NULL;
235:
1.128 fgsch 236: again:
237: while ((opt = getopt(ac, av,
1.229 djm 238: "1246ab:c:e:fgi:kl:m:no:p:qstvxACD:F:I:L:MNO:PR:S:TVXY")) != -1) {
1.31 markus 239: switch (opt) {
1.91 jakob 240: case '1':
241: options.protocol = SSH_PROTO_1;
242: break;
1.47 markus 243: case '2':
244: options.protocol = SSH_PROTO_2;
245: break;
1.37 markus 246: case '4':
1.196 djm 247: options.address_family = AF_INET;
1.37 markus 248: break;
249: case '6':
1.196 djm 250: options.address_family = AF_INET6;
1.37 markus 251: break;
1.31 markus 252: case 'n':
253: stdin_null_flag = 1;
254: break;
255: case 'f':
256: fork_after_authentication_flag = 1;
257: stdin_null_flag = 1;
258: break;
259: case 'x':
260: options.forward_x11 = 0;
261: break;
262: case 'X':
263: options.forward_x11 = 1;
264: break;
1.202 markus 265: case 'Y':
266: options.forward_x11 = 1;
267: options.forward_x11_trusted = 1;
268: break;
1.31 markus 269: case 'g':
270: options.gateway_ports = 1;
271: break;
1.229 djm 272: case 'O':
273: if (strcmp(optarg, "check") == 0)
274: mux_command = SSHMUX_COMMAND_ALIVE_CHECK;
275: else if (strcmp(optarg, "exit") == 0)
276: mux_command = SSHMUX_COMMAND_TERMINATE;
277: else
278: fatal("Invalid multiplex command.");
279: break;
1.183 stevesk 280: case 'P': /* deprecated */
1.31 markus 281: options.use_privileged_port = 0;
282: break;
283: case 'a':
284: options.forward_agent = 0;
1.53 markus 285: break;
286: case 'A':
287: options.forward_agent = 1;
1.31 markus 288: break;
289: case 'k':
1.204 dtucker 290: options.gss_deleg_creds = 0;
1.31 markus 291: break;
292: case 'i':
293: if (stat(optarg, &st) < 0) {
1.128 fgsch 294: fprintf(stderr, "Warning: Identity file %s "
1.231 otto 295: "not accessible: %s.\n", optarg,
296: strerror(errno));
1.31 markus 297: break;
298: }
1.128 fgsch 299: if (options.num_identity_files >=
300: SSH_MAX_IDENTITY_FILES)
301: fatal("Too many identity files specified "
302: "(max %d)", SSH_MAX_IDENTITY_FILES);
303: options.identity_files[options.num_identity_files++] =
304: xstrdup(optarg);
1.31 markus 305: break;
1.127 markus 306: case 'I':
307: #ifdef SMARTCARD
1.133 markus 308: options.smartcard_device = xstrdup(optarg);
1.137 jakob 309: #else
1.127 markus 310: fprintf(stderr, "no support for smartcards.\n");
1.137 jakob 311: #endif
1.127 markus 312: break;
1.31 markus 313: case 't':
1.79 markus 314: if (tty_flag)
315: force_tty_flag = 1;
1.31 markus 316: tty_flag = 1;
317: break;
318: case 'v':
1.197 markus 319: if (debug_flag == 0) {
1.66 markus 320: debug_flag = 1;
321: options.log_level = SYSLOG_LEVEL_DEBUG1;
1.197 markus 322: } else {
323: if (options.log_level < SYSLOG_LEVEL_DEBUG3)
324: options.log_level++;
1.66 markus 325: break;
1.197 markus 326: }
1.227 deraadt 327: /* FALLTHROUGH */
1.31 markus 328: case 'V':
1.209 markus 329: fprintf(stderr, "%s, %s\n",
330: SSH_VERSION, SSLeay_version(SSLEAY_VERSION));
1.31 markus 331: if (opt == 'V')
332: exit(0);
333: break;
334: case 'q':
335: options.log_level = SYSLOG_LEVEL_QUIET;
336: break;
337: case 'e':
338: if (optarg[0] == '^' && optarg[2] == 0 &&
1.128 fgsch 339: (u_char) optarg[1] >= 64 &&
340: (u_char) optarg[1] < 128)
1.78 markus 341: options.escape_char = (u_char) optarg[1] & 31;
1.31 markus 342: else if (strlen(optarg) == 1)
1.78 markus 343: options.escape_char = (u_char) optarg[0];
1.31 markus 344: else if (strcmp(optarg, "none") == 0)
1.119 stevesk 345: options.escape_char = SSH_ESCAPECHAR_NONE;
1.31 markus 346: else {
1.128 fgsch 347: fprintf(stderr, "Bad escape character '%s'.\n",
348: optarg);
1.31 markus 349: exit(1);
350: }
351: break;
352: case 'c':
1.49 markus 353: if (ciphers_valid(optarg)) {
354: /* SSH2 only */
355: options.ciphers = xstrdup(optarg);
1.224 markus 356: options.cipher = SSH_CIPHER_INVALID;
1.49 markus 357: } else {
358: /* SSH1 only */
1.74 markus 359: options.cipher = cipher_number(optarg);
360: if (options.cipher == -1) {
1.128 fgsch 361: fprintf(stderr,
362: "Unknown cipher type '%s'\n",
363: optarg);
1.49 markus 364: exit(1);
365: }
1.128 fgsch 366: if (options.cipher == SSH_CIPHER_3DES)
1.74 markus 367: options.ciphers = "3des-cbc";
1.128 fgsch 368: else if (options.cipher == SSH_CIPHER_BLOWFISH)
1.74 markus 369: options.ciphers = "blowfish-cbc";
1.128 fgsch 370: else
1.74 markus 371: options.ciphers = (char *)-1;
1.95 markus 372: }
373: break;
374: case 'm':
375: if (mac_valid(optarg))
376: options.macs = xstrdup(optarg);
377: else {
1.128 fgsch 378: fprintf(stderr, "Unknown mac type '%s'\n",
379: optarg);
1.95 markus 380: exit(1);
1.31 markus 381: }
382: break;
1.214 djm 383: case 'M':
1.242 ! djm 384: if (options.control_master == SSHCTL_MASTER_YES)
! 385: options.control_master = SSHCTL_MASTER_ASK;
! 386: else
! 387: options.control_master = SSHCTL_MASTER_YES;
1.214 djm 388: break;
1.31 markus 389: case 'p':
1.113 stevesk 390: options.port = a2port(optarg);
391: if (options.port == 0) {
1.109 markus 392: fprintf(stderr, "Bad port '%s'\n", optarg);
393: exit(1);
394: }
1.31 markus 395: break;
396: case 'l':
397: options.user = optarg;
398: break;
1.141 stevesk 399:
400: case 'L':
1.232 djm 401: if (parse_forward(&fwd, optarg))
402: add_local_forward(&options, &fwd);
403: else {
1.128 fgsch 404: fprintf(stderr,
1.232 djm 405: "Bad local forwarding specification '%s'\n",
1.128 fgsch 406: optarg);
1.232 djm 407: exit(1);
1.31 markus 408: }
1.232 djm 409: break;
410:
411: case 'R':
412: if (parse_forward(&fwd, optarg)) {
413: add_remote_forward(&options, &fwd);
414: } else {
1.128 fgsch 415: fprintf(stderr,
1.232 djm 416: "Bad remote forwarding specification "
417: "'%s'\n", optarg);
1.141 stevesk 418: exit(1);
1.31 markus 419: }
420: break;
1.108 markus 421:
422: case 'D':
1.232 djm 423: cp = p = xstrdup(optarg);
424: memset(&fwd, '\0', sizeof(fwd));
425: fwd.connect_host = "socks";
426: if ((fwd.listen_host = hpdelim(&cp)) == NULL) {
427: fprintf(stderr, "Bad dynamic forwarding "
428: "specification '%.100s'\n", optarg);
429: exit(1);
430: }
431: if (cp != NULL) {
432: fwd.listen_port = a2port(cp);
433: fwd.listen_host = cleanhostname(fwd.listen_host);
434: } else {
435: fwd.listen_port = a2port(fwd.listen_host);
436: fwd.listen_host = "";
437: }
438:
439: if (fwd.listen_port == 0) {
1.128 fgsch 440: fprintf(stderr, "Bad dynamic port '%s'\n",
441: optarg);
1.109 markus 442: exit(1);
443: }
1.232 djm 444: add_local_forward(&options, &fwd);
445: xfree(p);
1.108 markus 446: break;
447:
1.31 markus 448: case 'C':
449: options.compression = 1;
450: break;
1.45 markus 451: case 'N':
452: no_shell_flag = 1;
453: no_tty_flag = 1;
454: break;
455: case 'T':
456: no_tty_flag = 1;
457: break;
1.31 markus 458: case 'o':
459: dummy = 1;
1.205 markus 460: line = xstrdup(optarg);
1.128 fgsch 461: if (process_config_line(&options, host ? host : "",
1.205 markus 462: line, "command-line", 0, &dummy) != 0)
1.31 markus 463: exit(1);
1.205 markus 464: xfree(line);
1.31 markus 465: break;
1.85 djm 466: case 's':
467: subsystem_flag = 1;
1.117 markus 468: break;
1.214 djm 469: case 'S':
470: if (options.control_path != NULL)
471: free(options.control_path);
472: options.control_path = xstrdup(optarg);
473: break;
1.117 markus 474: case 'b':
475: options.bind_address = optarg;
1.85 djm 476: break;
1.139 markus 477: case 'F':
478: config = optarg;
479: break;
1.31 markus 480: default:
481: usage();
1.1 deraadt 482: }
1.31 markus 483: }
484:
1.128 fgsch 485: ac -= optind;
486: av += optind;
487:
488: if (ac > 0 && !host && **av != '-') {
1.188 markus 489: if (strrchr(*av, '@')) {
1.128 fgsch 490: p = xstrdup(*av);
1.188 markus 491: cp = strrchr(p, '@');
1.128 fgsch 492: if (cp == NULL || cp == p)
493: usage();
494: options.user = p;
495: *cp = '\0';
496: host = ++cp;
497: } else
498: host = *av;
1.189 millert 499: if (ac > 1) {
500: optind = optreset = 1;
1.128 fgsch 501: goto again;
502: }
1.189 millert 503: ac--, av++;
1.128 fgsch 504: }
505:
1.31 markus 506: /* Check that we got a host name. */
507: if (!host)
508: usage();
509:
1.54 markus 510: SSLeay_add_all_algorithms();
1.72 markus 511: ERR_load_crypto_strings();
1.31 markus 512:
513: /* Initialize the command to execute on remote host. */
514: buffer_init(&command);
1.1 deraadt 515:
1.33 markus 516: /*
517: * Save the command to execute on the remote host in a buffer. There
518: * is no limit on the length of the command, except by the maximum
519: * packet size. Also sets the tty flag if there is no command.
520: */
1.128 fgsch 521: if (!ac) {
1.31 markus 522: /* No command specified - execute shell on a tty. */
523: tty_flag = 1;
1.85 djm 524: if (subsystem_flag) {
1.128 fgsch 525: fprintf(stderr,
526: "You must specify a subsystem to invoke.\n");
1.85 djm 527: usage();
528: }
1.31 markus 529: } else {
1.128 fgsch 530: /* A command has been specified. Store it into the buffer. */
531: for (i = 0; i < ac; i++) {
532: if (i)
1.31 markus 533: buffer_append(&command, " ", 1);
534: buffer_append(&command, av[i], strlen(av[i]));
535: }
536: }
537:
538: /* Cannot fork to background if no command. */
1.63 markus 539: if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag)
1.31 markus 540: fatal("Cannot fork into background without a command to execute.");
541:
542: /* Allocate a tty by default if no command specified. */
543: if (buffer_len(&command) == 0)
544: tty_flag = 1;
545:
1.180 deraadt 546: /* Force no tty */
1.75 markus 547: if (no_tty_flag)
548: tty_flag = 0;
1.31 markus 549: /* Do not allocate a tty if stdin is not a tty. */
1.236 djm 550: if ((!isatty(fileno(stdin)) || stdin_null_flag) && !force_tty_flag) {
1.31 markus 551: if (tty_flag)
1.191 itojun 552: logit("Pseudo-terminal will not be allocated because stdin is not a terminal.");
1.31 markus 553: tty_flag = 0;
554: }
1.45 markus 555:
1.101 markus 556: /*
557: * Initialize "log" output. Since we are the client all output
558: * actually goes to stderr.
559: */
1.111 markus 560: log_init(av[0], options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level,
561: SYSLOG_FACILITY_USER, 1);
1.31 markus 562:
1.139 markus 563: /*
564: * Read per-user configuration file. Ignore the system wide config
565: * file if the user specifies a config file on the command line.
566: */
567: if (config != NULL) {
1.211 djm 568: if (!read_config_file(config, host, &options, 0))
1.142 stevesk 569: fatal("Can't open user config file %.100s: "
570: "%.100s", config, strerror(errno));
1.139 markus 571: } else {
572: snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir,
573: _PATH_SSH_USER_CONFFILE);
1.210 djm 574: (void)read_config_file(buf, host, &options, 1);
1.139 markus 575:
1.145 markus 576: /* Read systemwide configuration file after use config. */
1.223 deraadt 577: (void)read_config_file(_PATH_HOST_CONFIG_FILE, host,
1.210 djm 578: &options, 0);
1.139 markus 579: }
1.31 markus 580:
581: /* Fill configuration defaults. */
582: fill_default_options(&options);
583:
1.196 djm 584: channel_set_af(options.address_family);
585:
1.31 markus 586: /* reinit */
1.101 markus 587: log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 1);
1.31 markus 588:
589: if (options.user == NULL)
590: options.user = xstrdup(pw->pw_name);
591:
592: if (options.hostname != NULL)
593: host = options.hostname;
1.195 markus 594:
595: /* force lowercase for hostkey matching */
596: if (options.host_key_alias != NULL) {
597: for (p = options.host_key_alias; *p; p++)
598: if (isupper(*p))
599: *p = tolower(*p);
600: }
1.190 markus 601:
602: if (options.proxy_command != NULL &&
603: strcmp(options.proxy_command, "none") == 0)
604: options.proxy_command = NULL;
1.31 markus 605:
1.214 djm 606: if (options.control_path != NULL) {
1.241 djm 607: snprintf(buf, sizeof(buf), "%d", options.port);
608: cp = tilde_expand_filename(options.control_path,
609: original_real_uid);
610: options.control_path = percent_expand(cp, "p", buf, "h", host,
611: "r", options.user, (char *)NULL);
612: xfree(cp);
1.214 djm 613: }
1.240 djm 614: if (mux_command != 0 && options.control_path == NULL)
615: fatal("No ControlPath specified for \"-O\" command");
1.242 ! djm 616: if (options.control_path != NULL)
1.237 jakob 617: control_client(options.control_path);
1.214 djm 618:
1.77 markus 619: /* Open a connection to the remote host. */
1.203 djm 620: if (ssh_connect(host, &hostaddr, options.port,
1.196 djm 621: options.address_family, options.connection_attempts,
1.177 markus 622: original_effective_uid == 0 && options.use_privileged_port,
1.179 markus 623: options.proxy_command) != 0)
1.178 markus 624: exit(1);
1.31 markus 625:
1.33 markus 626: /*
627: * If we successfully made the connection, load the host private key
628: * in case we will need it later for combined rsa-rhosts
629: * authentication. This must be done before releasing extra
630: * privileges, because the file is only readable by root.
1.174 markus 631: * If we cannot access the private keys, load the public keys
632: * instead and try to execute the ssh-keysign helper instead.
1.33 markus 633: */
1.112 markus 634: sensitive_data.nkeys = 0;
635: sensitive_data.keys = NULL;
1.173 markus 636: sensitive_data.external_keysign = 0;
1.178 markus 637: if (options.rhosts_rsa_authentication ||
638: options.hostbased_authentication) {
1.112 markus 639: sensitive_data.nkeys = 3;
1.180 deraadt 640: sensitive_data.keys = xmalloc(sensitive_data.nkeys *
641: sizeof(Key));
1.177 markus 642:
643: PRIV_START;
1.112 markus 644: sensitive_data.keys[0] = key_load_private_type(KEY_RSA1,
1.105 markus 645: _PATH_HOST_KEY_FILE, "", NULL);
1.112 markus 646: sensitive_data.keys[1] = key_load_private_type(KEY_DSA,
647: _PATH_HOST_DSA_KEY_FILE, "", NULL);
648: sensitive_data.keys[2] = key_load_private_type(KEY_RSA,
649: _PATH_HOST_RSA_KEY_FILE, "", NULL);
1.177 markus 650: PRIV_END;
1.173 markus 651:
1.181 markus 652: if (options.hostbased_authentication == 1 &&
653: sensitive_data.keys[0] == NULL &&
1.173 markus 654: sensitive_data.keys[1] == NULL &&
655: sensitive_data.keys[2] == NULL) {
656: sensitive_data.keys[1] = key_load_public(
657: _PATH_HOST_DSA_KEY_FILE, NULL);
658: sensitive_data.keys[2] = key_load_public(
659: _PATH_HOST_RSA_KEY_FILE, NULL);
660: sensitive_data.external_keysign = 1;
661: }
1.31 markus 662: }
1.33 markus 663: /*
664: * Get rid of any extra privileges that we may have. We will no
665: * longer need them. Also, extra privileges could make it very hard
666: * to read identity files and other non-world-readable files from the
667: * user's home directory if it happens to be on a NFS volume where
668: * root is mapped to nobody.
669: */
1.225 dtucker 670: if (original_effective_uid == 0) {
671: PRIV_START;
672: permanently_set_uid(pw);
673: }
1.31 markus 674:
1.33 markus 675: /*
676: * Now that we are back to our own permissions, create ~/.ssh
677: * directory if it doesn\'t already exist.
678: */
1.138 jakob 679: snprintf(buf, sizeof buf, "%.100s%s%.100s", pw->pw_dir, strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR);
1.31 markus 680: if (stat(buf, &st) < 0)
1.57 djm 681: if (mkdir(buf, 0700) < 0)
1.31 markus 682: error("Could not create directory '%.200s'.", buf);
683:
1.104 markus 684: /* load options.identity_files */
685: load_public_identity_files();
686:
687: /* Expand ~ in known host file names. */
688: /* XXX mem-leaks: */
1.72 markus 689: options.system_hostfile =
690: tilde_expand_filename(options.system_hostfile, original_real_uid);
691: options.user_hostfile =
692: tilde_expand_filename(options.user_hostfile, original_real_uid);
693: options.system_hostfile2 =
694: tilde_expand_filename(options.system_hostfile2, original_real_uid);
695: options.user_hostfile2 =
696: tilde_expand_filename(options.user_hostfile2, original_real_uid);
1.149 markus 697:
698: signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
1.31 markus 699:
700: /* Log into the remote system. This never returns if the login fails. */
1.173 markus 701: ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr, pw);
1.31 markus 702:
1.112 markus 703: /* We no longer need the private host keys. Clear them now. */
704: if (sensitive_data.nkeys != 0) {
705: for (i = 0; i < sensitive_data.nkeys; i++) {
706: if (sensitive_data.keys[i] != NULL) {
707: /* Destroys contents safely */
708: debug3("clear hostkey %d", i);
709: key_free(sensitive_data.keys[i]);
710: sensitive_data.keys[i] = NULL;
711: }
712: }
713: xfree(sensitive_data.keys);
1.134 markus 714: }
715: for (i = 0; i < options.num_identity_files; i++) {
716: if (options.identity_files[i]) {
717: xfree(options.identity_files[i]);
718: options.identity_files[i] = NULL;
719: }
720: if (options.identity_keys[i]) {
721: key_free(options.identity_keys[i]);
722: options.identity_keys[i] = NULL;
723: }
1.112 markus 724: }
1.31 markus 725:
1.45 markus 726: exit_status = compat20 ? ssh_session2() : ssh_session();
727: packet_close();
1.186 djm 728:
1.214 djm 729: if (options.control_path != NULL && control_fd != -1)
730: unlink(options.control_path);
731:
1.186 djm 732: /*
1.203 djm 733: * Send SIGHUP to proxy command if used. We don't wait() in
1.186 djm 734: * case it hangs and instead rely on init to reap the child
735: */
736: if (proxy_command_pid > 1)
737: kill(proxy_command_pid, SIGHUP);
738:
1.45 markus 739: return exit_status;
740: }
741:
1.202 markus 742: #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
743:
1.126 itojun 744: static void
1.150 stevesk 745: x11_get_proto(char **_proto, char **_data)
1.50 markus 746: {
1.202 markus 747: char cmd[1024];
1.50 markus 748: char line[512];
1.202 markus 749: char xdisplay[512];
1.150 stevesk 750: static char proto[512], data[512];
1.50 markus 751: FILE *f;
1.202 markus 752: int got_data = 0, generated = 0, do_unlink = 0, i;
753: char *display, *xauthdir, *xauthfile;
1.182 stevesk 754: struct stat st;
1.50 markus 755:
1.202 markus 756: xauthdir = xauthfile = NULL;
1.150 stevesk 757: *_proto = proto;
758: *_data = data;
759: proto[0] = data[0] = '\0';
1.202 markus 760:
1.182 stevesk 761: if (!options.xauth_location ||
762: (stat(options.xauth_location, &st) == -1)) {
763: debug("No xauth program.");
764: } else {
765: if ((display = getenv("DISPLAY")) == NULL) {
766: debug("x11_get_proto: DISPLAY not set");
767: return;
768: }
1.202 markus 769: /*
770: * Handle FamilyLocal case where $DISPLAY does
771: * not match an authorization entry. For this we
772: * just try "xauth list unix:displaynum.screennum".
773: * XXX: "localhost" match to determine FamilyLocal
774: * is not perfect.
775: */
776: if (strncmp(display, "localhost:", 10) == 0) {
777: snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
778: display + 10);
779: display = xdisplay;
780: }
781: if (options.forward_x11_trusted == 0) {
782: xauthdir = xmalloc(MAXPATHLEN);
783: xauthfile = xmalloc(MAXPATHLEN);
784: strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN);
785: if (mkdtemp(xauthdir) != NULL) {
786: do_unlink = 1;
787: snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile",
788: xauthdir);
789: snprintf(cmd, sizeof(cmd),
790: "%s -f %s generate %s " SSH_X11_PROTO
1.207 markus 791: " untrusted timeout 1200 2>" _PATH_DEVNULL,
1.202 markus 792: options.xauth_location, xauthfile, display);
793: debug2("x11_get_proto: %s", cmd);
794: if (system(cmd) == 0)
795: generated = 1;
796: }
797: }
798: snprintf(cmd, sizeof(cmd),
799: "%s %s%s list %s . 2>" _PATH_DEVNULL,
800: options.xauth_location,
801: generated ? "-f " : "" ,
802: generated ? xauthfile : "",
803: display);
804: debug2("x11_get_proto: %s", cmd);
805: f = popen(cmd, "r");
1.55 markus 806: if (f && fgets(line, sizeof(line), f) &&
1.150 stevesk 807: sscanf(line, "%*s %511s %511s", proto, data) == 2)
1.55 markus 808: got_data = 1;
809: if (f)
810: pclose(f);
811: }
1.202 markus 812:
813: if (do_unlink) {
814: unlink(xauthfile);
815: rmdir(xauthdir);
816: }
817: if (xauthdir)
818: xfree(xauthdir);
819: if (xauthfile)
820: xfree(xauthfile);
821:
1.50 markus 822: /*
823: * If we didn't get authentication data, just make up some
824: * data. The forwarding code will check the validity of the
825: * response anyway, and substitute this data. The X11
826: * server, however, will ignore this fake data and use
827: * whatever authentication mechanisms it was using otherwise
828: * for the local connection.
829: */
830: if (!got_data) {
1.221 avsm 831: u_int32_t rnd = 0;
1.50 markus 832:
1.202 markus 833: logit("Warning: No xauth data; "
834: "using fake authentication data for X11 forwarding.");
835: strlcpy(proto, SSH_X11_PROTO, sizeof proto);
1.50 markus 836: for (i = 0; i < 16; i++) {
837: if (i % 4 == 0)
1.221 avsm 838: rnd = arc4random();
1.202 markus 839: snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
1.221 avsm 840: rnd & 0xff);
841: rnd >>= 8;
1.50 markus 842: }
843: }
844: }
845:
1.126 itojun 846: static void
1.70 markus 847: ssh_init_forwarding(void)
848: {
1.86 markus 849: int success = 0;
1.70 markus 850: int i;
1.86 markus 851:
1.70 markus 852: /* Initiate local TCP/IP port forwardings. */
853: for (i = 0; i < options.num_local_forwards; i++) {
1.232 djm 854: debug("Local connections to %.200s:%d forwarded to remote "
855: "address %.200s:%d",
1.234 deraadt 856: (options.local_forwards[i].listen_host == NULL) ?
857: (options.gateway_ports ? "*" : "LOCALHOST") :
1.232 djm 858: options.local_forwards[i].listen_host,
859: options.local_forwards[i].listen_port,
860: options.local_forwards[i].connect_host,
861: options.local_forwards[i].connect_port);
1.158 markus 862: success += channel_setup_local_fwd_listener(
1.232 djm 863: options.local_forwards[i].listen_host,
864: options.local_forwards[i].listen_port,
865: options.local_forwards[i].connect_host,
866: options.local_forwards[i].connect_port,
1.70 markus 867: options.gateway_ports);
868: }
1.86 markus 869: if (i > 0 && success == 0)
870: error("Could not request local forwarding.");
1.70 markus 871:
872: /* Initiate remote TCP/IP port forwardings. */
873: for (i = 0; i < options.num_remote_forwards; i++) {
1.232 djm 874: debug("Remote connections from %.200s:%d forwarded to "
875: "local address %.200s:%d",
1.235 dtucker 876: (options.remote_forwards[i].listen_host == NULL) ?
877: (options.gateway_ports ? "*" : "LOCALHOST") :
1.232 djm 878: options.remote_forwards[i].listen_host,
879: options.remote_forwards[i].listen_port,
880: options.remote_forwards[i].connect_host,
881: options.remote_forwards[i].connect_port);
1.70 markus 882: channel_request_remote_forwarding(
1.232 djm 883: options.remote_forwards[i].listen_host,
884: options.remote_forwards[i].listen_port,
885: options.remote_forwards[i].connect_host,
886: options.remote_forwards[i].connect_port);
1.70 markus 887: }
888: }
889:
1.126 itojun 890: static void
1.70 markus 891: check_agent_present(void)
892: {
893: if (options.forward_agent) {
894: /* Clear agent forwarding if we don\'t have an agent. */
1.185 stevesk 895: if (!ssh_agent_present())
1.70 markus 896: options.forward_agent = 0;
897: }
898: }
899:
1.126 itojun 900: static int
1.45 markus 901: ssh_session(void)
902: {
903: int type;
904: int interactive = 0;
905: int have_tty = 0;
906: struct winsize ws;
907: char *cp;
908:
1.31 markus 909: /* Enable compression if requested. */
910: if (options.compression) {
911: debug("Requesting compression at level %d.", options.compression_level);
912:
913: if (options.compression_level < 1 || options.compression_level > 9)
914: fatal("Compression level must be from 1 (fast) to 9 (slow, best).");
915:
916: /* Send the request. */
917: packet_start(SSH_CMSG_REQUEST_COMPRESSION);
918: packet_put_int(options.compression_level);
919: packet_send();
920: packet_write_wait();
1.156 markus 921: type = packet_read();
1.31 markus 922: if (type == SSH_SMSG_SUCCESS)
923: packet_start_compression(options.compression_level);
924: else if (type == SSH_SMSG_FAILURE)
1.191 itojun 925: logit("Warning: Remote host refused compression.");
1.31 markus 926: else
927: packet_disconnect("Protocol error waiting for compression response.");
928: }
929: /* Allocate a pseudo tty if appropriate. */
930: if (tty_flag) {
931: debug("Requesting pty.");
932:
933: /* Start the packet. */
934: packet_start(SSH_CMSG_REQUEST_PTY);
935:
936: /* Store TERM in the packet. There is no limit on the
937: length of the string. */
938: cp = getenv("TERM");
939: if (!cp)
940: cp = "";
1.124 markus 941: packet_put_cstring(cp);
1.31 markus 942:
943: /* Store window size in the packet. */
944: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
945: memset(&ws, 0, sizeof(ws));
946: packet_put_int(ws.ws_row);
947: packet_put_int(ws.ws_col);
948: packet_put_int(ws.ws_xpixel);
949: packet_put_int(ws.ws_ypixel);
950:
951: /* Store tty modes in the packet. */
1.115 stevesk 952: tty_make_modes(fileno(stdin), NULL);
1.31 markus 953:
954: /* Send the packet, and wait for it to leave. */
955: packet_send();
956: packet_write_wait();
957:
958: /* Read response from the server. */
1.156 markus 959: type = packet_read();
1.43 markus 960: if (type == SSH_SMSG_SUCCESS) {
1.31 markus 961: interactive = 1;
1.45 markus 962: have_tty = 1;
1.43 markus 963: } else if (type == SSH_SMSG_FAILURE)
1.191 itojun 964: logit("Warning: Remote host failed or refused to allocate a pseudo tty.");
1.31 markus 965: else
966: packet_disconnect("Protocol error waiting for pty request response.");
967: }
968: /* Request X11 forwarding if enabled and DISPLAY is set. */
969: if (options.forward_x11 && getenv("DISPLAY") != NULL) {
1.150 stevesk 970: char *proto, *data;
1.50 markus 971: /* Get reasonable local authentication information. */
1.150 stevesk 972: x11_get_proto(&proto, &data);
1.50 markus 973: /* Request forwarding with authentication spoofing. */
1.31 markus 974: debug("Requesting X11 forwarding with authentication spoofing.");
1.50 markus 975: x11_request_forwarding_with_spoofing(0, proto, data);
1.31 markus 976:
977: /* Read response from the server. */
1.156 markus 978: type = packet_read();
1.31 markus 979: if (type == SSH_SMSG_SUCCESS) {
980: interactive = 1;
1.50 markus 981: } else if (type == SSH_SMSG_FAILURE) {
1.191 itojun 982: logit("Warning: Remote host denied X11 forwarding.");
1.50 markus 983: } else {
1.31 markus 984: packet_disconnect("Protocol error waiting for X11 forwarding");
1.50 markus 985: }
1.31 markus 986: }
987: /* Tell the packet module whether this is an interactive session. */
1.80 markus 988: packet_set_interactive(interactive);
1.31 markus 989:
990: /* Request authentication agent forwarding if appropriate. */
1.70 markus 991: check_agent_present();
992:
1.31 markus 993: if (options.forward_agent) {
994: debug("Requesting authentication agent forwarding.");
995: auth_request_forwarding();
996:
997: /* Read response from the server. */
1.156 markus 998: type = packet_read();
1.155 markus 999: packet_check_eom();
1.31 markus 1000: if (type != SSH_SMSG_SUCCESS)
1.191 itojun 1001: logit("Warning: Remote host denied authentication agent forwarding.");
1.31 markus 1002: }
1003:
1.70 markus 1004: /* Initiate port forwardings. */
1005: ssh_init_forwarding();
1.34 markus 1006:
1007: /* If requested, let ssh continue in the background. */
1.48 markus 1008: if (fork_after_authentication_flag)
1.34 markus 1009: if (daemon(1, 1) < 0)
1010: fatal("daemon() failed: %.200s", strerror(errno));
1.31 markus 1011:
1.33 markus 1012: /*
1013: * If a command was specified on the command line, execute the
1014: * command now. Otherwise request the server to start a shell.
1015: */
1.31 markus 1016: if (buffer_len(&command) > 0) {
1017: int len = buffer_len(&command);
1018: if (len > 900)
1019: len = 900;
1.152 stevesk 1020: debug("Sending command: %.*s", len, (u_char *)buffer_ptr(&command));
1.31 markus 1021: packet_start(SSH_CMSG_EXEC_CMD);
1022: packet_put_string(buffer_ptr(&command), buffer_len(&command));
1023: packet_send();
1024: packet_write_wait();
1025: } else {
1026: debug("Requesting shell.");
1027: packet_start(SSH_CMSG_EXEC_SHELL);
1028: packet_send();
1029: packet_write_wait();
1030: }
1031:
1032: /* Enter the interactive session. */
1.119 stevesk 1033: return client_loop(have_tty, tty_flag ?
1034: options.escape_char : SSH_ESCAPECHAR_NONE, 0);
1.45 markus 1035: }
1036:
1.126 itojun 1037: static void
1.214 djm 1038: ssh_subsystem_reply(int type, u_int32_t seq, void *ctxt)
1.89 markus 1039: {
1040: int id, len;
1041:
1042: id = packet_get_int();
1043: len = buffer_len(&command);
1.100 markus 1044: if (len > 900)
1045: len = 900;
1.155 markus 1046: packet_check_eom();
1.89 markus 1047: if (type == SSH2_MSG_CHANNEL_FAILURE)
1048: fatal("Request for subsystem '%.*s' failed on channel %d",
1.152 stevesk 1049: len, (u_char *)buffer_ptr(&command), id);
1.170 markus 1050: }
1051:
1052: void
1.206 markus 1053: client_global_request_reply_fwd(int type, u_int32_t seq, void *ctxt)
1.170 markus 1054: {
1055: int i;
1056:
1057: i = client_global_request_id++;
1.206 markus 1058: if (i >= options.num_remote_forwards)
1.170 markus 1059: return;
1060: debug("remote forward %s for: listen %d, connect %s:%d",
1061: type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
1.232 djm 1062: options.remote_forwards[i].listen_port,
1063: options.remote_forwards[i].connect_host,
1064: options.remote_forwards[i].connect_port);
1.170 markus 1065: if (type == SSH2_MSG_REQUEST_FAILURE)
1.232 djm 1066: logit("Warning: remote port forwarding failed for listen "
1067: "port %d", options.remote_forwards[i].listen_port);
1.89 markus 1068: }
1069:
1.126 itojun 1070: static void
1.214 djm 1071: ssh_control_listener(void)
1.45 markus 1072: {
1.214 djm 1073: struct sockaddr_un addr;
1074: mode_t old_umask;
1.223 deraadt 1075:
1.242 ! djm 1076: if (options.control_path == NULL ||
! 1077: options.control_master == SSHCTL_MASTER_NO)
1.214 djm 1078: return;
1079:
1.242 ! djm 1080: debug("setting up multiplex master socket");
! 1081:
1.214 djm 1082: memset(&addr, '\0', sizeof(addr));
1083: addr.sun_family = AF_UNIX;
1084: addr.sun_len = offsetof(struct sockaddr_un, sun_path) +
1085: strlen(options.control_path) + 1;
1086:
1087: if (strlcpy(addr.sun_path, options.control_path,
1088: sizeof(addr.sun_path)) >= sizeof(addr.sun_path))
1089: fatal("ControlPath too long");
1090:
1091: if ((control_fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0)
1092: fatal("%s socket(): %s\n", __func__, strerror(errno));
1093:
1094: old_umask = umask(0177);
1095: if (bind(control_fd, (struct sockaddr*)&addr, addr.sun_len) == -1) {
1096: control_fd = -1;
1.238 djm 1097: if (errno == EINVAL || errno == EADDRINUSE)
1.214 djm 1098: fatal("ControlSocket %s already exists",
1099: options.control_path);
1100: else
1101: fatal("%s bind(): %s\n", __func__, strerror(errno));
1102: }
1103: umask(old_umask);
1.80 markus 1104:
1.214 djm 1105: if (listen(control_fd, 64) == -1)
1106: fatal("%s listen(): %s\n", __func__, strerror(errno));
1.31 markus 1107:
1.214 djm 1108: set_nonblock(control_fd);
1109: }
1.45 markus 1110:
1.214 djm 1111: /* request pty/x11/agent/tcpfwd/shell for channel */
1112: static void
1113: ssh_session2_setup(int id, void *arg)
1114: {
1.215 djm 1115: extern char **environ;
1116:
1.214 djm 1117: int interactive = tty_flag;
1118: if (options.forward_x11 && getenv("DISPLAY") != NULL) {
1.150 stevesk 1119: char *proto, *data;
1.50 markus 1120: /* Get reasonable local authentication information. */
1.150 stevesk 1121: x11_get_proto(&proto, &data);
1.50 markus 1122: /* Request forwarding with authentication spoofing. */
1123: debug("Requesting X11 forwarding with authentication spoofing.");
1124: x11_request_forwarding_with_spoofing(id, proto, data);
1.80 markus 1125: interactive = 1;
1.50 markus 1126: /* XXX wait for reply */
1127: }
1128:
1.70 markus 1129: check_agent_present();
1130: if (options.forward_agent) {
1131: debug("Requesting authentication agent forwarding.");
1132: channel_request_start(id, "auth-agent-req@openssh.com", 0);
1133: packet_send();
1.212 djm 1134: }
1135:
1.214 djm 1136: client_session2_setup(id, tty_flag, subsystem_flag, getenv("TERM"),
1.215 djm 1137: NULL, fileno(stdin), &command, environ, &ssh_subsystem_reply);
1.90 markus 1138:
1.80 markus 1139: packet_set_interactive(interactive);
1.45 markus 1140: }
1141:
1.143 markus 1142: /* open new channel for a session */
1.126 itojun 1143: static int
1.143 markus 1144: ssh_session2_open(void)
1.45 markus 1145: {
1.118 markus 1146: Channel *c;
1147: int window, packetmax, in, out, err;
1.60 markus 1148:
1.62 markus 1149: if (stdin_null_flag) {
1.93 itojun 1150: in = open(_PATH_DEVNULL, O_RDONLY);
1.62 markus 1151: } else {
1152: in = dup(STDIN_FILENO);
1153: }
1.60 markus 1154: out = dup(STDOUT_FILENO);
1155: err = dup(STDERR_FILENO);
1.45 markus 1156:
1157: if (in < 0 || out < 0 || err < 0)
1.62 markus 1158: fatal("dup() in/out/err failed");
1.45 markus 1159:
1.69 markus 1160: /* enable nonblocking unless tty */
1161: if (!isatty(in))
1162: set_nonblock(in);
1163: if (!isatty(out))
1164: set_nonblock(out);
1165: if (!isatty(err))
1166: set_nonblock(err);
1167:
1.65 markus 1168: window = CHAN_SES_WINDOW_DEFAULT;
1169: packetmax = CHAN_SES_PACKET_DEFAULT;
1.164 markus 1170: if (tty_flag) {
1171: window >>= 1;
1172: packetmax >>= 1;
1.45 markus 1173: }
1.118 markus 1174: c = channel_new(
1.45 markus 1175: "session", SSH_CHANNEL_OPENING, in, out, err,
1.65 markus 1176: window, packetmax, CHAN_EXTENDED_WRITE,
1.192 markus 1177: "client-session", /*nonblock*/0);
1.45 markus 1178:
1.143 markus 1179: debug3("ssh_session2_open: channel_new: %d", c->self);
1.106 markus 1180:
1.122 markus 1181: channel_send_open(c->self);
1.143 markus 1182: if (!no_shell_flag)
1.214 djm 1183: channel_register_confirm(c->self, ssh_session2_setup, NULL);
1.106 markus 1184:
1.118 markus 1185: return c->self;
1.106 markus 1186: }
1187:
1.126 itojun 1188: static int
1.106 markus 1189: ssh_session2(void)
1190: {
1.143 markus 1191: int id = -1;
1.106 markus 1192:
1193: /* XXX should be pre-session */
1194: ssh_init_forwarding();
1.214 djm 1195: ssh_control_listener();
1.106 markus 1196:
1.143 markus 1197: if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN))
1198: id = ssh_session2_open();
1.106 markus 1199:
1200: /* If requested, let ssh continue in the background. */
1201: if (fork_after_authentication_flag)
1202: if (daemon(1, 1) < 0)
1203: fatal("daemon() failed: %.200s", strerror(errno));
1.31 markus 1204:
1.119 stevesk 1205: return client_loop(tty_flag, tty_flag ?
1206: options.escape_char : SSH_ESCAPECHAR_NONE, id);
1.72 markus 1207: }
1208:
1.126 itojun 1209: static void
1.104 markus 1210: load_public_identity_files(void)
1211: {
1212: char *filename;
1.167 markus 1213: int i = 0;
1.104 markus 1214: Key *public;
1.167 markus 1215: #ifdef SMARTCARD
1216: Key **keys;
1.104 markus 1217:
1.133 markus 1218: if (options.smartcard_device != NULL &&
1.167 markus 1219: options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
1220: (keys = sc_get_keys(options.smartcard_device, NULL)) != NULL ) {
1221: int count = 0;
1222: for (i = 0; keys[i] != NULL; i++) {
1223: count++;
1224: memmove(&options.identity_files[1], &options.identity_files[0],
1225: sizeof(char *) * (SSH_MAX_IDENTITY_FILES - 1));
1226: memmove(&options.identity_keys[1], &options.identity_keys[0],
1227: sizeof(Key *) * (SSH_MAX_IDENTITY_FILES - 1));
1228: options.num_identity_files++;
1229: options.identity_keys[0] = keys[i];
1.194 markus 1230: options.identity_files[0] = sc_get_key_label(keys[i]);
1.167 markus 1231: }
1.168 markus 1232: if (options.num_identity_files > SSH_MAX_IDENTITY_FILES)
1233: options.num_identity_files = SSH_MAX_IDENTITY_FILES;
1.167 markus 1234: i = count;
1235: xfree(keys);
1.127 markus 1236: }
1.136 jakob 1237: #endif /* SMARTCARD */
1.131 millert 1238: for (; i < options.num_identity_files; i++) {
1239: filename = tilde_expand_filename(options.identity_files[i],
1240: original_real_uid);
1241: public = key_load_public(filename, NULL);
1242: debug("identity file %s type %d", filename,
1243: public ? public->type : -1);
1244: xfree(options.identity_files[i]);
1245: options.identity_files[i] = filename;
1246: options.identity_keys[i] = public;
1247: }
1.214 djm 1248: }
1249:
1250: static void
1251: control_client_sighandler(int signo)
1252: {
1253: control_client_terminate = signo;
1254: }
1255:
1256: static void
1257: control_client_sigrelay(int signo)
1258: {
1259: if (control_server_pid > 1)
1260: kill(control_server_pid, signo);
1261: }
1262:
1.220 djm 1263: static int
1264: env_permitted(char *env)
1265: {
1266: int i;
1267: char name[1024], *cp;
1268:
1269: strlcpy(name, env, sizeof(name));
1270: if ((cp = strchr(name, '=')) == NULL)
1271: return (0);
1272:
1273: *cp = '\0';
1274:
1275: for (i = 0; i < options.num_send_env; i++)
1276: if (match_pattern(name, options.send_env[i]))
1277: return (1);
1278:
1279: return (0);
1280: }
1281:
1.214 djm 1282: static void
1283: control_client(const char *path)
1284: {
1285: struct sockaddr_un addr;
1.228 djm 1286: int i, r, fd, sock, exitval, num_env;
1.214 djm 1287: Buffer m;
1.229 djm 1288: char *term;
1.215 djm 1289: extern char **environ;
1.229 djm 1290: u_int flags;
1.242 ! djm 1291:
! 1292: if (mux_command == 0)
! 1293: mux_command = SSHMUX_COMMAND_OPEN;
! 1294:
! 1295: switch (options.control_master) {
! 1296: case SSHCTL_MASTER_AUTO:
! 1297: case SSHCTL_MASTER_AUTO_ASK:
! 1298: debug("auto-mux: Trying existing master");
! 1299: /* FALLTHROUGH */
! 1300: case SSHCTL_MASTER_NO:
! 1301: break;
! 1302: default:
! 1303: return;
! 1304: }
1.228 djm 1305:
1.214 djm 1306: memset(&addr, '\0', sizeof(addr));
1307: addr.sun_family = AF_UNIX;
1308: addr.sun_len = offsetof(struct sockaddr_un, sun_path) +
1309: strlen(path) + 1;
1310:
1311: if (strlcpy(addr.sun_path, path,
1312: sizeof(addr.sun_path)) >= sizeof(addr.sun_path))
1313: fatal("ControlPath too long");
1314:
1315: if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) < 0)
1316: fatal("%s socket(): %s", __func__, strerror(errno));
1317:
1.237 jakob 1318: if (connect(sock, (struct sockaddr*)&addr, addr.sun_len) == -1) {
1.240 djm 1319: if (mux_command != SSHMUX_COMMAND_OPEN) {
1320: fatal("Control socket connect(%.100s): %s", path,
1321: strerror(errno));
1322: }
1.239 djm 1323: if (errno == ENOENT)
1324: debug("Control socket \"%.100s\" does not exist", path);
1325: else {
1326: error("Control socket connect(%.100s): %s", path,
1327: strerror(errno));
1328: }
1.237 jakob 1329: close(sock);
1330: return;
1331: }
1332:
1333: if (stdin_null_flag) {
1334: if ((fd = open(_PATH_DEVNULL, O_RDONLY)) == -1)
1335: fatal("open(/dev/null): %s", strerror(errno));
1336: if (dup2(fd, STDIN_FILENO) == -1)
1337: fatal("dup2: %s", strerror(errno));
1338: if (fd > STDERR_FILENO)
1339: close(fd);
1340: }
1341:
1.229 djm 1342: if ((term = getenv("TERM")) == NULL)
1343: term = "";
1344:
1345: flags = 0;
1346: if (tty_flag)
1347: flags |= SSHMUX_FLAG_TTY;
1348: if (subsystem_flag)
1349: flags |= SSHMUX_FLAG_SUBSYS;
1.214 djm 1350:
1351: buffer_init(&m);
1352:
1.229 djm 1353: /* Send our command to server */
1354: buffer_put_int(&m, mux_command);
1355: buffer_put_int(&m, flags);
1356: if (ssh_msg_send(sock, /* version */1, &m) == -1)
1357: fatal("%s: msg_send", __func__);
1358: buffer_clear(&m);
1359:
1360: /* Get authorisation status and PID of controlee */
1.214 djm 1361: if (ssh_msg_recv(sock, &m) == -1)
1362: fatal("%s: msg_recv", __func__);
1.229 djm 1363: if (buffer_get_char(&m) != 1)
1.214 djm 1364: fatal("%s: wrong version", __func__);
1.216 djm 1365: if (buffer_get_int(&m) != 1)
1366: fatal("Connection to master denied");
1.214 djm 1367: control_server_pid = buffer_get_int(&m);
1368:
1369: buffer_clear(&m);
1370:
1.229 djm 1371: switch (mux_command) {
1372: case SSHMUX_COMMAND_ALIVE_CHECK:
1.234 deraadt 1373: fprintf(stderr, "Master running (pid=%d)\r\n",
1.229 djm 1374: control_server_pid);
1375: exit(0);
1376: case SSHMUX_COMMAND_TERMINATE:
1377: fprintf(stderr, "Exit request sent.\r\n");
1378: exit(0);
1379: case SSHMUX_COMMAND_OPEN:
1380: /* continue below */
1381: break;
1382: default:
1383: fatal("silly mux_command %d", mux_command);
1384: }
1385:
1386: /* SSHMUX_COMMAND_OPEN */
1387: buffer_put_cstring(&m, term);
1.214 djm 1388: buffer_append(&command, "\0", 1);
1389: buffer_put_cstring(&m, buffer_ptr(&command));
1.215 djm 1390:
1.220 djm 1391: if (options.num_send_env == 0 || environ == NULL) {
1392: buffer_put_int(&m, 0);
1.223 deraadt 1393: } else {
1.220 djm 1394: /* Pass environment */
1395: num_env = 0;
1396: for (i = 0; environ[i] != NULL; i++)
1397: if (env_permitted(environ[i]))
1398: num_env++; /* Count */
1.223 deraadt 1399:
1.220 djm 1400: buffer_put_int(&m, num_env);
1401:
1.222 dtucker 1402: for (i = 0; environ[i] != NULL && num_env >= 0; i++)
1403: if (env_permitted(environ[i])) {
1404: num_env--;
1.220 djm 1405: buffer_put_cstring(&m, environ[i]);
1.222 dtucker 1406: }
1.220 djm 1407: }
1.214 djm 1408:
1.229 djm 1409: if (ssh_msg_send(sock, /* version */1, &m) == -1)
1.214 djm 1410: fatal("%s: msg_send", __func__);
1411:
1412: mm_send_fd(sock, STDIN_FILENO);
1413: mm_send_fd(sock, STDOUT_FILENO);
1414: mm_send_fd(sock, STDERR_FILENO);
1415:
1416: /* Wait for reply, so master has a chance to gather ttymodes */
1417: buffer_clear(&m);
1418: if (ssh_msg_recv(sock, &m) == -1)
1419: fatal("%s: msg_recv", __func__);
1.229 djm 1420: if (buffer_get_char(&m) != 1)
1421: fatal("%s: wrong version", __func__);
1.214 djm 1422: buffer_free(&m);
1.218 djm 1423:
1.226 djm 1424: signal(SIGHUP, control_client_sighandler);
1.218 djm 1425: signal(SIGINT, control_client_sighandler);
1426: signal(SIGTERM, control_client_sighandler);
1427: signal(SIGWINCH, control_client_sigrelay);
1.214 djm 1428:
1429: if (tty_flag)
1430: enter_raw_mode();
1431:
1432: /* Stick around until the controlee closes the client_fd */
1433: exitval = 0;
1434: for (;!control_client_terminate;) {
1435: r = read(sock, &exitval, sizeof(exitval));
1436: if (r == 0) {
1437: debug2("Received EOF from master");
1438: break;
1439: }
1440: if (r > 0)
1441: debug2("Received exit status from master %d", exitval);
1442: if (r == -1 && errno != EINTR)
1443: fatal("%s: read %s", __func__, strerror(errno));
1444: }
1445:
1446: if (control_client_terminate)
1447: debug2("Exiting on signal %d", control_client_terminate);
1448:
1449: close(sock);
1450:
1451: leave_raw_mode();
1452:
1453: if (tty_flag && options.log_level != SYSLOG_LEVEL_QUIET)
1454: fprintf(stderr, "Connection to master closed.\r\n");
1455:
1456: exit(exitval);
1.1 deraadt 1457: }
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