Annotation of src/usr.bin/ssh/ssh.c, Revision 1.293.4.1
1.293.4.1! brad 1: /* $OpenBSD: ssh.c,v 1.294 2006/10/06 02:29:19 djm Exp $ */
1.1 deraadt 2: /*
1.32 deraadt 3: * Author: Tatu Ylonen <ylo@cs.hut.fi>
4: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5: * All rights reserved
6: * Ssh client program. This program can be used to log into a remote machine.
7: * The software supports strong authentication, encryption, and forwarding
8: * of X11, TCP/IP, and authentication connections.
9: *
1.64 deraadt 10: * As far as I am concerned, the code I have written for this software
11: * can be used freely for any purpose. Any derived versions of this
12: * software must be clearly marked as such, and if the derived work is
13: * incompatible with the protocol description in the RFC file, it must be
14: * called by a name other than "ssh" or "Secure Shell".
15: *
16: * Copyright (c) 1999 Niels Provos. All rights reserved.
1.202 markus 17: * Copyright (c) 2000, 2001, 2002, 2003 Markus Friedl. All rights reserved.
1.64 deraadt 18: *
19: * Modified to work with SSL by Niels Provos <provos@citi.umich.edu>
20: * in Canada (German citizen).
21: *
22: * Redistribution and use in source and binary forms, with or without
23: * modification, are permitted provided that the following conditions
24: * are met:
25: * 1. Redistributions of source code must retain the above copyright
26: * notice, this list of conditions and the following disclaimer.
27: * 2. Redistributions in binary form must reproduce the above copyright
28: * notice, this list of conditions and the following disclaimer in the
29: * documentation and/or other materials provided with the distribution.
30: *
31: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
32: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
33: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
34: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
35: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
36: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
37: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
38: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
39: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
40: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.32 deraadt 41: */
1.1 deraadt 42:
1.293 deraadt 43: #include <sys/types.h>
1.293.4.1! brad 44: #include <sys/time.h>
1.259 stevesk 45: #include <sys/resource.h>
1.260 stevesk 46: #include <sys/ioctl.h>
1.262 stevesk 47: #include <sys/types.h>
1.280 stevesk 48: #include <sys/socket.h>
1.262 stevesk 49: #include <sys/un.h>
1.264 stevesk 50: #include <sys/stat.h>
1.258 stevesk 51:
1.265 stevesk 52: #include <ctype.h>
1.285 stevesk 53: #include <errno.h>
1.281 stevesk 54: #include <fcntl.h>
1.286 stevesk 55: #include <netdb.h>
1.258 stevesk 56: #include <paths.h>
1.279 stevesk 57: #include <pwd.h>
1.263 stevesk 58: #include <signal.h>
1.287 stevesk 59: #include <stddef.h>
1.291 stevesk 60: #include <stdio.h>
1.290 stevesk 61: #include <stdlib.h>
1.289 stevesk 62: #include <string.h>
1.288 stevesk 63: #include <unistd.h>
1.49 markus 64:
65: #include <openssl/evp.h>
1.72 markus 66: #include <openssl/err.h>
1.1 deraadt 67:
1.293 deraadt 68: #include "xmalloc.h"
1.84 markus 69: #include "ssh.h"
70: #include "ssh1.h"
71: #include "ssh2.h"
72: #include "compat.h"
73: #include "cipher.h"
1.1 deraadt 74: #include "packet.h"
75: #include "buffer.h"
1.123 markus 76: #include "channels.h"
1.49 markus 77: #include "key.h"
1.58 markus 78: #include "authfd.h"
1.49 markus 79: #include "authfile.h"
1.83 markus 80: #include "pathnames.h"
1.214 djm 81: #include "dispatch.h"
1.81 markus 82: #include "clientloop.h"
1.84 markus 83: #include "log.h"
84: #include "readconf.h"
85: #include "sshconnect.h"
86: #include "misc.h"
1.95 markus 87: #include "kex.h"
88: #include "mac.h"
1.213 deraadt 89: #include "sshpty.h"
1.212 djm 90: #include "match.h"
1.214 djm 91: #include "msg.h"
92: #include "monitor_fdpass.h"
1.225 dtucker 93: #include "uidswap.h"
1.278 stevesk 94: #include "version.h"
1.49 markus 95:
1.127 markus 96: #ifdef SMARTCARD
97: #include "scard.h"
1.137 jakob 98: #endif
1.127 markus 99:
1.49 markus 100: extern char *__progname;
1.1 deraadt 101:
1.31 markus 102: /* Flag indicating whether debug mode is on. This can be set on the command line. */
1.1 deraadt 103: int debug_flag = 0;
104:
1.46 markus 105: /* Flag indicating whether a tty should be allocated */
1.1 deraadt 106: int tty_flag = 0;
1.79 markus 107: int no_tty_flag = 0;
108: int force_tty_flag = 0;
1.1 deraadt 109:
1.45 markus 110: /* don't exec a shell */
111: int no_shell_flag = 0;
112:
1.33 markus 113: /*
114: * Flag indicating that nothing should be read from stdin. This can be set
115: * on the command line.
116: */
1.1 deraadt 117: int stdin_null_flag = 0;
118:
1.33 markus 119: /*
120: * Flag indicating that ssh should fork after authentication. This is useful
1.172 deraadt 121: * so that the passphrase can be entered manually, and then ssh goes to the
1.33 markus 122: * background.
123: */
1.1 deraadt 124: int fork_after_authentication_flag = 0;
125:
1.33 markus 126: /*
127: * General data structure for command line options and options configurable
128: * in configuration files. See readconf.h.
129: */
1.1 deraadt 130: Options options;
131:
1.139 markus 132: /* optional user configfile */
133: char *config = NULL;
134:
1.33 markus 135: /*
136: * Name of the host we are connecting to. This is the name given on the
137: * command line, or the HostName specified for the user-supplied name in a
138: * configuration file.
139: */
1.1 deraadt 140: char *host;
141:
1.22 provos 142: /* socket address the host resolves to */
1.37 markus 143: struct sockaddr_storage hostaddr;
1.1 deraadt 144:
1.112 markus 145: /* Private host keys. */
1.173 markus 146: Sensitive sensitive_data;
1.1 deraadt 147:
1.10 dugsong 148: /* Original real UID. */
149: uid_t original_real_uid;
1.177 markus 150: uid_t original_effective_uid;
1.1 deraadt 151:
1.45 markus 152: /* command to be executed */
153: Buffer command;
154:
1.85 djm 155: /* Should we execute a command or invoke a subsystem? */
156: int subsystem_flag = 0;
157:
1.170 markus 158: /* # of replies received for global requests */
159: static int client_global_request_id = 0;
160:
1.186 djm 161: /* pid of proxycommand child process */
162: pid_t proxy_command_pid = 0;
163:
1.214 djm 164: /* fd to control socket */
165: int control_fd = -1;
166:
1.229 djm 167: /* Multiplexing control command */
1.240 djm 168: static u_int mux_command = 0;
1.229 djm 169:
1.214 djm 170: /* Only used in control client mode */
171: volatile sig_atomic_t control_client_terminate = 0;
172: u_int control_server_pid = 0;
173:
1.1 deraadt 174: /* Prints a help message to the user. This function never returns. */
175:
1.126 itojun 176: static void
1.93 itojun 177: usage(void)
1.1 deraadt 178: {
1.208 markus 179: fprintf(stderr,
1.230 jmc 180: "usage: ssh [-1246AaCfgkMNnqsTtVvXxY] [-b bind_address] [-c cipher_spec]\n"
1.251 jmc 181: " [-D [bind_address:]port] [-e escape_char] [-F configfile]\n"
1.233 jmc 182: " [-i identity_file] [-L [bind_address:]port:host:hostport]\n"
1.232 djm 183: " [-l login_name] [-m mac_spec] [-O ctl_cmd] [-o option] [-p port]\n"
1.233 jmc 184: " [-R [bind_address:]port:host:hostport] [-S ctl_path]\n"
1.277 stevesk 185: " [-w local_tun[:remote_tun]] [user@]hostname [command]\n"
1.208 markus 186: );
1.257 dtucker 187: exit(255);
1.1 deraadt 188: }
189:
1.126 itojun 190: static int ssh_session(void);
191: static int ssh_session2(void);
192: static void load_public_identity_files(void);
1.214 djm 193: static void control_client(const char *path);
1.45 markus 194:
1.32 deraadt 195: /*
196: * Main program for the ssh client.
197: */
1.2 provos 198: int
199: main(int ac, char **av)
1.1 deraadt 200: {
1.178 markus 201: int i, opt, exit_status;
1.205 markus 202: char *p, *cp, *line, buf[256];
1.31 markus 203: struct stat st;
1.98 markus 204: struct passwd *pw;
1.45 markus 205: int dummy;
1.144 stevesk 206: extern int optind, optreset;
207: extern char *optarg;
1.244 djm 208: struct servent *sp;
1.232 djm 209: Forward fwd;
1.250 djm 210:
211: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
212: sanitise_stdfd();
1.31 markus 213:
1.33 markus 214: /*
215: * Save the original real uid. It will be needed later (uid-swapping
216: * may clobber the real uid).
217: */
1.31 markus 218: original_real_uid = getuid();
219: original_effective_uid = geteuid();
220:
1.184 stevesk 221: /*
222: * Use uid-swapping to give up root privileges for the duration of
223: * option processing. We will re-instantiate the rights when we are
224: * ready to create the privileged port, and will permanently drop
225: * them when the port has been created (actually, when the connection
226: * has been made, as we may need to create the port several times).
227: */
228: PRIV_END;
229:
1.31 markus 230: /* If we are installed setuid root be careful to not drop core. */
231: if (original_real_uid != original_effective_uid) {
232: struct rlimit rlim;
233: rlim.rlim_cur = rlim.rlim_max = 0;
234: if (setrlimit(RLIMIT_CORE, &rlim) < 0)
235: fatal("setrlimit failed: %.100s", strerror(errno));
1.1 deraadt 236: }
1.107 markus 237: /* Get user data. */
238: pw = getpwuid(original_real_uid);
239: if (!pw) {
1.191 itojun 240: logit("You don't exist, go away!");
1.257 dtucker 241: exit(255);
1.107 markus 242: }
243: /* Take a copy of the returned structure. */
244: pw = pwcopy(pw);
1.31 markus 245:
1.33 markus 246: /*
247: * Set our umask to something reasonable, as some files are created
248: * with the default umask. This will make them world-readable but
249: * writable only by the owner, which is ok for all files for which we
250: * don't set the modes explicitly.
251: */
1.31 markus 252: umask(022);
253:
254: /* Initialize option structure to indicate that no values have been set. */
255: initialize_options(&options);
256:
257: /* Parse command-line arguments. */
258: host = NULL;
259:
1.266 djm 260: again:
1.128 fgsch 261: while ((opt = getopt(ac, av,
1.255 reyk 262: "1246ab:c:e:fgi:kl:m:no:p:qstvxACD:F:I:L:MNO:PR:S:TVw:XY")) != -1) {
1.31 markus 263: switch (opt) {
1.91 jakob 264: case '1':
265: options.protocol = SSH_PROTO_1;
266: break;
1.47 markus 267: case '2':
268: options.protocol = SSH_PROTO_2;
269: break;
1.37 markus 270: case '4':
1.196 djm 271: options.address_family = AF_INET;
1.37 markus 272: break;
273: case '6':
1.196 djm 274: options.address_family = AF_INET6;
1.37 markus 275: break;
1.31 markus 276: case 'n':
277: stdin_null_flag = 1;
278: break;
279: case 'f':
280: fork_after_authentication_flag = 1;
281: stdin_null_flag = 1;
282: break;
283: case 'x':
284: options.forward_x11 = 0;
285: break;
286: case 'X':
287: options.forward_x11 = 1;
288: break;
1.202 markus 289: case 'Y':
290: options.forward_x11 = 1;
291: options.forward_x11_trusted = 1;
292: break;
1.31 markus 293: case 'g':
294: options.gateway_ports = 1;
295: break;
1.229 djm 296: case 'O':
297: if (strcmp(optarg, "check") == 0)
298: mux_command = SSHMUX_COMMAND_ALIVE_CHECK;
299: else if (strcmp(optarg, "exit") == 0)
300: mux_command = SSHMUX_COMMAND_TERMINATE;
301: else
302: fatal("Invalid multiplex command.");
303: break;
1.183 stevesk 304: case 'P': /* deprecated */
1.31 markus 305: options.use_privileged_port = 0;
306: break;
307: case 'a':
308: options.forward_agent = 0;
1.53 markus 309: break;
310: case 'A':
311: options.forward_agent = 1;
1.31 markus 312: break;
313: case 'k':
1.204 dtucker 314: options.gss_deleg_creds = 0;
1.31 markus 315: break;
316: case 'i':
317: if (stat(optarg, &st) < 0) {
1.128 fgsch 318: fprintf(stderr, "Warning: Identity file %s "
1.231 otto 319: "not accessible: %s.\n", optarg,
320: strerror(errno));
1.31 markus 321: break;
322: }
1.128 fgsch 323: if (options.num_identity_files >=
324: SSH_MAX_IDENTITY_FILES)
325: fatal("Too many identity files specified "
326: "(max %d)", SSH_MAX_IDENTITY_FILES);
327: options.identity_files[options.num_identity_files++] =
328: xstrdup(optarg);
1.31 markus 329: break;
1.127 markus 330: case 'I':
331: #ifdef SMARTCARD
1.133 markus 332: options.smartcard_device = xstrdup(optarg);
1.137 jakob 333: #else
1.127 markus 334: fprintf(stderr, "no support for smartcards.\n");
1.137 jakob 335: #endif
1.127 markus 336: break;
1.31 markus 337: case 't':
1.79 markus 338: if (tty_flag)
339: force_tty_flag = 1;
1.31 markus 340: tty_flag = 1;
341: break;
342: case 'v':
1.197 markus 343: if (debug_flag == 0) {
1.66 markus 344: debug_flag = 1;
345: options.log_level = SYSLOG_LEVEL_DEBUG1;
1.197 markus 346: } else {
347: if (options.log_level < SYSLOG_LEVEL_DEBUG3)
348: options.log_level++;
1.66 markus 349: break;
1.197 markus 350: }
1.227 deraadt 351: /* FALLTHROUGH */
1.31 markus 352: case 'V':
1.209 markus 353: fprintf(stderr, "%s, %s\n",
354: SSH_VERSION, SSLeay_version(SSLEAY_VERSION));
1.31 markus 355: if (opt == 'V')
356: exit(0);
357: break;
1.255 reyk 358: case 'w':
1.256 reyk 359: if (options.tun_open == -1)
360: options.tun_open = SSH_TUNMODE_DEFAULT;
1.255 reyk 361: options.tun_local = a2tun(optarg, &options.tun_remote);
1.256 reyk 362: if (options.tun_local == SSH_TUNID_ERR) {
1.255 reyk 363: fprintf(stderr, "Bad tun device '%s'\n", optarg);
1.257 dtucker 364: exit(255);
1.255 reyk 365: }
366: break;
1.31 markus 367: case 'q':
368: options.log_level = SYSLOG_LEVEL_QUIET;
369: break;
370: case 'e':
371: if (optarg[0] == '^' && optarg[2] == 0 &&
1.128 fgsch 372: (u_char) optarg[1] >= 64 &&
373: (u_char) optarg[1] < 128)
1.78 markus 374: options.escape_char = (u_char) optarg[1] & 31;
1.31 markus 375: else if (strlen(optarg) == 1)
1.78 markus 376: options.escape_char = (u_char) optarg[0];
1.31 markus 377: else if (strcmp(optarg, "none") == 0)
1.119 stevesk 378: options.escape_char = SSH_ESCAPECHAR_NONE;
1.31 markus 379: else {
1.128 fgsch 380: fprintf(stderr, "Bad escape character '%s'.\n",
381: optarg);
1.257 dtucker 382: exit(255);
1.31 markus 383: }
384: break;
385: case 'c':
1.49 markus 386: if (ciphers_valid(optarg)) {
387: /* SSH2 only */
388: options.ciphers = xstrdup(optarg);
1.224 markus 389: options.cipher = SSH_CIPHER_INVALID;
1.49 markus 390: } else {
391: /* SSH1 only */
1.74 markus 392: options.cipher = cipher_number(optarg);
393: if (options.cipher == -1) {
1.128 fgsch 394: fprintf(stderr,
395: "Unknown cipher type '%s'\n",
396: optarg);
1.257 dtucker 397: exit(255);
1.49 markus 398: }
1.128 fgsch 399: if (options.cipher == SSH_CIPHER_3DES)
1.74 markus 400: options.ciphers = "3des-cbc";
1.128 fgsch 401: else if (options.cipher == SSH_CIPHER_BLOWFISH)
1.74 markus 402: options.ciphers = "blowfish-cbc";
1.128 fgsch 403: else
1.74 markus 404: options.ciphers = (char *)-1;
1.95 markus 405: }
406: break;
407: case 'm':
408: if (mac_valid(optarg))
409: options.macs = xstrdup(optarg);
410: else {
1.128 fgsch 411: fprintf(stderr, "Unknown mac type '%s'\n",
412: optarg);
1.257 dtucker 413: exit(255);
1.31 markus 414: }
415: break;
1.214 djm 416: case 'M':
1.242 djm 417: if (options.control_master == SSHCTL_MASTER_YES)
418: options.control_master = SSHCTL_MASTER_ASK;
419: else
420: options.control_master = SSHCTL_MASTER_YES;
1.214 djm 421: break;
1.31 markus 422: case 'p':
1.113 stevesk 423: options.port = a2port(optarg);
424: if (options.port == 0) {
1.109 markus 425: fprintf(stderr, "Bad port '%s'\n", optarg);
1.257 dtucker 426: exit(255);
1.109 markus 427: }
1.31 markus 428: break;
429: case 'l':
430: options.user = optarg;
431: break;
1.141 stevesk 432:
433: case 'L':
1.232 djm 434: if (parse_forward(&fwd, optarg))
435: add_local_forward(&options, &fwd);
436: else {
1.128 fgsch 437: fprintf(stderr,
1.232 djm 438: "Bad local forwarding specification '%s'\n",
1.128 fgsch 439: optarg);
1.257 dtucker 440: exit(255);
1.31 markus 441: }
1.232 djm 442: break;
443:
444: case 'R':
445: if (parse_forward(&fwd, optarg)) {
446: add_remote_forward(&options, &fwd);
447: } else {
1.128 fgsch 448: fprintf(stderr,
1.232 djm 449: "Bad remote forwarding specification "
450: "'%s'\n", optarg);
1.257 dtucker 451: exit(255);
1.31 markus 452: }
453: break;
1.108 markus 454:
455: case 'D':
1.232 djm 456: cp = p = xstrdup(optarg);
457: memset(&fwd, '\0', sizeof(fwd));
458: fwd.connect_host = "socks";
459: if ((fwd.listen_host = hpdelim(&cp)) == NULL) {
460: fprintf(stderr, "Bad dynamic forwarding "
461: "specification '%.100s'\n", optarg);
1.257 dtucker 462: exit(255);
1.232 djm 463: }
464: if (cp != NULL) {
465: fwd.listen_port = a2port(cp);
466: fwd.listen_host = cleanhostname(fwd.listen_host);
467: } else {
468: fwd.listen_port = a2port(fwd.listen_host);
1.249 djm 469: fwd.listen_host = NULL;
1.232 djm 470: }
471:
472: if (fwd.listen_port == 0) {
1.128 fgsch 473: fprintf(stderr, "Bad dynamic port '%s'\n",
474: optarg);
1.257 dtucker 475: exit(255);
1.109 markus 476: }
1.232 djm 477: add_local_forward(&options, &fwd);
478: xfree(p);
1.108 markus 479: break;
480:
1.31 markus 481: case 'C':
482: options.compression = 1;
483: break;
1.45 markus 484: case 'N':
485: no_shell_flag = 1;
486: no_tty_flag = 1;
487: break;
488: case 'T':
489: no_tty_flag = 1;
490: break;
1.31 markus 491: case 'o':
492: dummy = 1;
1.205 markus 493: line = xstrdup(optarg);
1.128 fgsch 494: if (process_config_line(&options, host ? host : "",
1.205 markus 495: line, "command-line", 0, &dummy) != 0)
1.257 dtucker 496: exit(255);
1.205 markus 497: xfree(line);
1.31 markus 498: break;
1.85 djm 499: case 's':
500: subsystem_flag = 1;
1.117 markus 501: break;
1.214 djm 502: case 'S':
503: if (options.control_path != NULL)
504: free(options.control_path);
505: options.control_path = xstrdup(optarg);
506: break;
1.117 markus 507: case 'b':
508: options.bind_address = optarg;
1.85 djm 509: break;
1.139 markus 510: case 'F':
511: config = optarg;
512: break;
1.31 markus 513: default:
514: usage();
1.1 deraadt 515: }
1.31 markus 516: }
517:
1.128 fgsch 518: ac -= optind;
519: av += optind;
520:
521: if (ac > 0 && !host && **av != '-') {
1.188 markus 522: if (strrchr(*av, '@')) {
1.128 fgsch 523: p = xstrdup(*av);
1.188 markus 524: cp = strrchr(p, '@');
1.128 fgsch 525: if (cp == NULL || cp == p)
526: usage();
527: options.user = p;
528: *cp = '\0';
529: host = ++cp;
530: } else
531: host = *av;
1.189 millert 532: if (ac > 1) {
533: optind = optreset = 1;
1.128 fgsch 534: goto again;
535: }
1.189 millert 536: ac--, av++;
1.128 fgsch 537: }
538:
1.31 markus 539: /* Check that we got a host name. */
540: if (!host)
541: usage();
542:
1.54 markus 543: SSLeay_add_all_algorithms();
1.72 markus 544: ERR_load_crypto_strings();
1.31 markus 545:
546: /* Initialize the command to execute on remote host. */
547: buffer_init(&command);
1.1 deraadt 548:
1.33 markus 549: /*
550: * Save the command to execute on the remote host in a buffer. There
551: * is no limit on the length of the command, except by the maximum
552: * packet size. Also sets the tty flag if there is no command.
553: */
1.128 fgsch 554: if (!ac) {
1.31 markus 555: /* No command specified - execute shell on a tty. */
556: tty_flag = 1;
1.85 djm 557: if (subsystem_flag) {
1.128 fgsch 558: fprintf(stderr,
559: "You must specify a subsystem to invoke.\n");
1.85 djm 560: usage();
561: }
1.31 markus 562: } else {
1.128 fgsch 563: /* A command has been specified. Store it into the buffer. */
564: for (i = 0; i < ac; i++) {
565: if (i)
1.31 markus 566: buffer_append(&command, " ", 1);
567: buffer_append(&command, av[i], strlen(av[i]));
568: }
569: }
570:
571: /* Cannot fork to background if no command. */
1.63 markus 572: if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag)
1.31 markus 573: fatal("Cannot fork into background without a command to execute.");
574:
575: /* Allocate a tty by default if no command specified. */
576: if (buffer_len(&command) == 0)
577: tty_flag = 1;
578:
1.180 deraadt 579: /* Force no tty */
1.75 markus 580: if (no_tty_flag)
581: tty_flag = 0;
1.31 markus 582: /* Do not allocate a tty if stdin is not a tty. */
1.236 djm 583: if ((!isatty(fileno(stdin)) || stdin_null_flag) && !force_tty_flag) {
1.31 markus 584: if (tty_flag)
1.191 itojun 585: logit("Pseudo-terminal will not be allocated because stdin is not a terminal.");
1.31 markus 586: tty_flag = 0;
587: }
1.45 markus 588:
1.101 markus 589: /*
590: * Initialize "log" output. Since we are the client all output
591: * actually goes to stderr.
592: */
1.111 markus 593: log_init(av[0], options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level,
594: SYSLOG_FACILITY_USER, 1);
1.31 markus 595:
1.139 markus 596: /*
597: * Read per-user configuration file. Ignore the system wide config
598: * file if the user specifies a config file on the command line.
599: */
600: if (config != NULL) {
1.211 djm 601: if (!read_config_file(config, host, &options, 0))
1.142 stevesk 602: fatal("Can't open user config file %.100s: "
603: "%.100s", config, strerror(errno));
1.139 markus 604: } else {
605: snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir,
606: _PATH_SSH_USER_CONFFILE);
1.210 djm 607: (void)read_config_file(buf, host, &options, 1);
1.139 markus 608:
1.145 markus 609: /* Read systemwide configuration file after use config. */
1.223 deraadt 610: (void)read_config_file(_PATH_HOST_CONFIG_FILE, host,
1.210 djm 611: &options, 0);
1.139 markus 612: }
1.31 markus 613:
614: /* Fill configuration defaults. */
615: fill_default_options(&options);
616:
1.196 djm 617: channel_set_af(options.address_family);
618:
1.31 markus 619: /* reinit */
1.101 markus 620: log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 1);
1.31 markus 621:
622: if (options.user == NULL)
623: options.user = xstrdup(pw->pw_name);
624:
625: if (options.hostname != NULL)
626: host = options.hostname;
1.195 markus 627:
628: /* force lowercase for hostkey matching */
629: if (options.host_key_alias != NULL) {
630: for (p = options.host_key_alias; *p; p++)
631: if (isupper(*p))
1.271 deraadt 632: *p = (char)tolower(*p);
1.195 markus 633: }
1.190 markus 634:
1.246 djm 635: /* Get default port if port has not been set. */
636: if (options.port == 0) {
637: sp = getservbyname(SSH_SERVICE_NAME, "tcp");
638: options.port = sp ? ntohs(sp->s_port) : SSH_DEFAULT_PORT;
639: }
640:
1.190 markus 641: if (options.proxy_command != NULL &&
642: strcmp(options.proxy_command, "none") == 0)
643: options.proxy_command = NULL;
1.245 djm 644: if (options.control_path != NULL &&
645: strcmp(options.control_path, "none") == 0)
646: options.control_path = NULL;
1.31 markus 647:
1.214 djm 648: if (options.control_path != NULL) {
1.275 djm 649: char thishost[NI_MAXHOST];
1.261 djm 650:
1.275 djm 651: if (gethostname(thishost, sizeof(thishost)) == -1)
1.261 djm 652: fatal("gethostname: %s", strerror(errno));
1.241 djm 653: snprintf(buf, sizeof(buf), "%d", options.port);
654: cp = tilde_expand_filename(options.control_path,
655: original_real_uid);
656: options.control_path = percent_expand(cp, "p", buf, "h", host,
1.275 djm 657: "r", options.user, "l", thishost, (char *)NULL);
1.241 djm 658: xfree(cp);
1.214 djm 659: }
1.240 djm 660: if (mux_command != 0 && options.control_path == NULL)
661: fatal("No ControlPath specified for \"-O\" command");
1.242 djm 662: if (options.control_path != NULL)
1.237 jakob 663: control_client(options.control_path);
1.214 djm 664:
1.77 markus 665: /* Open a connection to the remote host. */
1.203 djm 666: if (ssh_connect(host, &hostaddr, options.port,
1.196 djm 667: options.address_family, options.connection_attempts,
1.177 markus 668: original_effective_uid == 0 && options.use_privileged_port,
1.179 markus 669: options.proxy_command) != 0)
1.257 dtucker 670: exit(255);
1.31 markus 671:
1.33 markus 672: /*
673: * If we successfully made the connection, load the host private key
674: * in case we will need it later for combined rsa-rhosts
675: * authentication. This must be done before releasing extra
676: * privileges, because the file is only readable by root.
1.174 markus 677: * If we cannot access the private keys, load the public keys
678: * instead and try to execute the ssh-keysign helper instead.
1.33 markus 679: */
1.112 markus 680: sensitive_data.nkeys = 0;
681: sensitive_data.keys = NULL;
1.173 markus 682: sensitive_data.external_keysign = 0;
1.178 markus 683: if (options.rhosts_rsa_authentication ||
684: options.hostbased_authentication) {
1.112 markus 685: sensitive_data.nkeys = 3;
1.274 deraadt 686: sensitive_data.keys = xcalloc(sensitive_data.nkeys,
1.180 deraadt 687: sizeof(Key));
1.177 markus 688:
689: PRIV_START;
1.112 markus 690: sensitive_data.keys[0] = key_load_private_type(KEY_RSA1,
1.276 dtucker 691: _PATH_HOST_KEY_FILE, "", NULL, NULL);
1.112 markus 692: sensitive_data.keys[1] = key_load_private_type(KEY_DSA,
1.276 dtucker 693: _PATH_HOST_DSA_KEY_FILE, "", NULL, NULL);
1.112 markus 694: sensitive_data.keys[2] = key_load_private_type(KEY_RSA,
1.276 dtucker 695: _PATH_HOST_RSA_KEY_FILE, "", NULL, NULL);
1.177 markus 696: PRIV_END;
1.173 markus 697:
1.181 markus 698: if (options.hostbased_authentication == 1 &&
699: sensitive_data.keys[0] == NULL &&
1.173 markus 700: sensitive_data.keys[1] == NULL &&
701: sensitive_data.keys[2] == NULL) {
702: sensitive_data.keys[1] = key_load_public(
703: _PATH_HOST_DSA_KEY_FILE, NULL);
704: sensitive_data.keys[2] = key_load_public(
705: _PATH_HOST_RSA_KEY_FILE, NULL);
706: sensitive_data.external_keysign = 1;
707: }
1.31 markus 708: }
1.33 markus 709: /*
710: * Get rid of any extra privileges that we may have. We will no
711: * longer need them. Also, extra privileges could make it very hard
712: * to read identity files and other non-world-readable files from the
713: * user's home directory if it happens to be on a NFS volume where
714: * root is mapped to nobody.
715: */
1.225 dtucker 716: if (original_effective_uid == 0) {
717: PRIV_START;
718: permanently_set_uid(pw);
719: }
1.31 markus 720:
1.33 markus 721: /*
722: * Now that we are back to our own permissions, create ~/.ssh
1.254 djm 723: * directory if it doesn't already exist.
1.33 markus 724: */
1.138 jakob 725: snprintf(buf, sizeof buf, "%.100s%s%.100s", pw->pw_dir, strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR);
1.31 markus 726: if (stat(buf, &st) < 0)
1.57 djm 727: if (mkdir(buf, 0700) < 0)
1.31 markus 728: error("Could not create directory '%.200s'.", buf);
729:
1.104 markus 730: /* load options.identity_files */
731: load_public_identity_files();
732:
733: /* Expand ~ in known host file names. */
734: /* XXX mem-leaks: */
1.72 markus 735: options.system_hostfile =
736: tilde_expand_filename(options.system_hostfile, original_real_uid);
737: options.user_hostfile =
738: tilde_expand_filename(options.user_hostfile, original_real_uid);
739: options.system_hostfile2 =
740: tilde_expand_filename(options.system_hostfile2, original_real_uid);
741: options.user_hostfile2 =
742: tilde_expand_filename(options.user_hostfile2, original_real_uid);
1.149 markus 743:
744: signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
1.31 markus 745:
746: /* Log into the remote system. This never returns if the login fails. */
1.173 markus 747: ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr, pw);
1.31 markus 748:
1.112 markus 749: /* We no longer need the private host keys. Clear them now. */
750: if (sensitive_data.nkeys != 0) {
751: for (i = 0; i < sensitive_data.nkeys; i++) {
752: if (sensitive_data.keys[i] != NULL) {
753: /* Destroys contents safely */
754: debug3("clear hostkey %d", i);
755: key_free(sensitive_data.keys[i]);
756: sensitive_data.keys[i] = NULL;
757: }
758: }
759: xfree(sensitive_data.keys);
1.134 markus 760: }
761: for (i = 0; i < options.num_identity_files; i++) {
762: if (options.identity_files[i]) {
763: xfree(options.identity_files[i]);
764: options.identity_files[i] = NULL;
765: }
766: if (options.identity_keys[i]) {
767: key_free(options.identity_keys[i]);
768: options.identity_keys[i] = NULL;
769: }
1.112 markus 770: }
1.31 markus 771:
1.45 markus 772: exit_status = compat20 ? ssh_session2() : ssh_session();
773: packet_close();
1.186 djm 774:
1.214 djm 775: if (options.control_path != NULL && control_fd != -1)
776: unlink(options.control_path);
777:
1.186 djm 778: /*
1.203 djm 779: * Send SIGHUP to proxy command if used. We don't wait() in
1.186 djm 780: * case it hangs and instead rely on init to reap the child
781: */
782: if (proxy_command_pid > 1)
783: kill(proxy_command_pid, SIGHUP);
784:
1.45 markus 785: return exit_status;
786: }
787:
1.126 itojun 788: static void
1.70 markus 789: ssh_init_forwarding(void)
790: {
1.86 markus 791: int success = 0;
1.70 markus 792: int i;
1.86 markus 793:
1.70 markus 794: /* Initiate local TCP/IP port forwardings. */
795: for (i = 0; i < options.num_local_forwards; i++) {
1.232 djm 796: debug("Local connections to %.200s:%d forwarded to remote "
797: "address %.200s:%d",
1.234 deraadt 798: (options.local_forwards[i].listen_host == NULL) ?
799: (options.gateway_ports ? "*" : "LOCALHOST") :
1.232 djm 800: options.local_forwards[i].listen_host,
801: options.local_forwards[i].listen_port,
802: options.local_forwards[i].connect_host,
803: options.local_forwards[i].connect_port);
1.158 markus 804: success += channel_setup_local_fwd_listener(
1.232 djm 805: options.local_forwards[i].listen_host,
806: options.local_forwards[i].listen_port,
807: options.local_forwards[i].connect_host,
808: options.local_forwards[i].connect_port,
1.70 markus 809: options.gateway_ports);
810: }
1.283 markus 811: if (i > 0 && success != i && options.exit_on_forward_failure)
812: fatal("Could not request local forwarding.");
1.86 markus 813: if (i > 0 && success == 0)
814: error("Could not request local forwarding.");
1.70 markus 815:
816: /* Initiate remote TCP/IP port forwardings. */
817: for (i = 0; i < options.num_remote_forwards; i++) {
1.232 djm 818: debug("Remote connections from %.200s:%d forwarded to "
819: "local address %.200s:%d",
1.248 djm 820: (options.remote_forwards[i].listen_host == NULL) ?
1.253 djm 821: "LOCALHOST" : options.remote_forwards[i].listen_host,
1.232 djm 822: options.remote_forwards[i].listen_port,
823: options.remote_forwards[i].connect_host,
824: options.remote_forwards[i].connect_port);
1.283 markus 825: if (channel_request_remote_forwarding(
1.232 djm 826: options.remote_forwards[i].listen_host,
827: options.remote_forwards[i].listen_port,
828: options.remote_forwards[i].connect_host,
1.283 markus 829: options.remote_forwards[i].connect_port) < 0) {
830: if (options.exit_on_forward_failure)
831: fatal("Could not request remote forwarding.");
832: else
833: logit("Warning: Could not request remote "
834: "forwarding.");
835: }
1.70 markus 836: }
837: }
838:
1.126 itojun 839: static void
1.70 markus 840: check_agent_present(void)
841: {
842: if (options.forward_agent) {
1.254 djm 843: /* Clear agent forwarding if we don't have an agent. */
1.185 stevesk 844: if (!ssh_agent_present())
1.70 markus 845: options.forward_agent = 0;
846: }
847: }
848:
1.126 itojun 849: static int
1.45 markus 850: ssh_session(void)
851: {
852: int type;
853: int interactive = 0;
854: int have_tty = 0;
855: struct winsize ws;
856: char *cp;
1.243 djm 857: const char *display;
1.45 markus 858:
1.31 markus 859: /* Enable compression if requested. */
860: if (options.compression) {
861: debug("Requesting compression at level %d.", options.compression_level);
862:
863: if (options.compression_level < 1 || options.compression_level > 9)
864: fatal("Compression level must be from 1 (fast) to 9 (slow, best).");
865:
866: /* Send the request. */
867: packet_start(SSH_CMSG_REQUEST_COMPRESSION);
868: packet_put_int(options.compression_level);
869: packet_send();
870: packet_write_wait();
1.156 markus 871: type = packet_read();
1.31 markus 872: if (type == SSH_SMSG_SUCCESS)
873: packet_start_compression(options.compression_level);
874: else if (type == SSH_SMSG_FAILURE)
1.191 itojun 875: logit("Warning: Remote host refused compression.");
1.31 markus 876: else
877: packet_disconnect("Protocol error waiting for compression response.");
878: }
879: /* Allocate a pseudo tty if appropriate. */
880: if (tty_flag) {
881: debug("Requesting pty.");
882:
883: /* Start the packet. */
884: packet_start(SSH_CMSG_REQUEST_PTY);
885:
886: /* Store TERM in the packet. There is no limit on the
887: length of the string. */
888: cp = getenv("TERM");
889: if (!cp)
890: cp = "";
1.124 markus 891: packet_put_cstring(cp);
1.31 markus 892:
893: /* Store window size in the packet. */
894: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
895: memset(&ws, 0, sizeof(ws));
1.269 deraadt 896: packet_put_int((u_int)ws.ws_row);
897: packet_put_int((u_int)ws.ws_col);
898: packet_put_int((u_int)ws.ws_xpixel);
899: packet_put_int((u_int)ws.ws_ypixel);
1.31 markus 900:
901: /* Store tty modes in the packet. */
1.115 stevesk 902: tty_make_modes(fileno(stdin), NULL);
1.31 markus 903:
904: /* Send the packet, and wait for it to leave. */
905: packet_send();
906: packet_write_wait();
907:
908: /* Read response from the server. */
1.156 markus 909: type = packet_read();
1.43 markus 910: if (type == SSH_SMSG_SUCCESS) {
1.31 markus 911: interactive = 1;
1.45 markus 912: have_tty = 1;
1.43 markus 913: } else if (type == SSH_SMSG_FAILURE)
1.191 itojun 914: logit("Warning: Remote host failed or refused to allocate a pseudo tty.");
1.31 markus 915: else
916: packet_disconnect("Protocol error waiting for pty request response.");
917: }
918: /* Request X11 forwarding if enabled and DISPLAY is set. */
1.243 djm 919: display = getenv("DISPLAY");
920: if (options.forward_x11 && display != NULL) {
1.150 stevesk 921: char *proto, *data;
1.50 markus 922: /* Get reasonable local authentication information. */
1.243 djm 923: client_x11_get_proto(display, options.xauth_location,
924: options.forward_x11_trusted, &proto, &data);
1.50 markus 925: /* Request forwarding with authentication spoofing. */
1.31 markus 926: debug("Requesting X11 forwarding with authentication spoofing.");
1.243 djm 927: x11_request_forwarding_with_spoofing(0, display, proto, data);
1.31 markus 928:
929: /* Read response from the server. */
1.156 markus 930: type = packet_read();
1.31 markus 931: if (type == SSH_SMSG_SUCCESS) {
932: interactive = 1;
1.50 markus 933: } else if (type == SSH_SMSG_FAILURE) {
1.191 itojun 934: logit("Warning: Remote host denied X11 forwarding.");
1.50 markus 935: } else {
1.31 markus 936: packet_disconnect("Protocol error waiting for X11 forwarding");
1.50 markus 937: }
1.31 markus 938: }
939: /* Tell the packet module whether this is an interactive session. */
1.80 markus 940: packet_set_interactive(interactive);
1.31 markus 941:
942: /* Request authentication agent forwarding if appropriate. */
1.70 markus 943: check_agent_present();
944:
1.31 markus 945: if (options.forward_agent) {
946: debug("Requesting authentication agent forwarding.");
947: auth_request_forwarding();
948:
949: /* Read response from the server. */
1.156 markus 950: type = packet_read();
1.155 markus 951: packet_check_eom();
1.31 markus 952: if (type != SSH_SMSG_SUCCESS)
1.191 itojun 953: logit("Warning: Remote host denied authentication agent forwarding.");
1.31 markus 954: }
955:
1.70 markus 956: /* Initiate port forwardings. */
957: ssh_init_forwarding();
1.34 markus 958:
959: /* If requested, let ssh continue in the background. */
1.48 markus 960: if (fork_after_authentication_flag)
1.34 markus 961: if (daemon(1, 1) < 0)
962: fatal("daemon() failed: %.200s", strerror(errno));
1.31 markus 963:
1.33 markus 964: /*
965: * If a command was specified on the command line, execute the
966: * command now. Otherwise request the server to start a shell.
967: */
1.31 markus 968: if (buffer_len(&command) > 0) {
969: int len = buffer_len(&command);
970: if (len > 900)
971: len = 900;
1.152 stevesk 972: debug("Sending command: %.*s", len, (u_char *)buffer_ptr(&command));
1.31 markus 973: packet_start(SSH_CMSG_EXEC_CMD);
974: packet_put_string(buffer_ptr(&command), buffer_len(&command));
975: packet_send();
976: packet_write_wait();
977: } else {
978: debug("Requesting shell.");
979: packet_start(SSH_CMSG_EXEC_SHELL);
980: packet_send();
981: packet_write_wait();
982: }
983:
984: /* Enter the interactive session. */
1.119 stevesk 985: return client_loop(have_tty, tty_flag ?
986: options.escape_char : SSH_ESCAPECHAR_NONE, 0);
1.45 markus 987: }
988:
1.126 itojun 989: static void
1.214 djm 990: ssh_subsystem_reply(int type, u_int32_t seq, void *ctxt)
1.89 markus 991: {
992: int id, len;
993:
994: id = packet_get_int();
995: len = buffer_len(&command);
1.100 markus 996: if (len > 900)
997: len = 900;
1.155 markus 998: packet_check_eom();
1.89 markus 999: if (type == SSH2_MSG_CHANNEL_FAILURE)
1000: fatal("Request for subsystem '%.*s' failed on channel %d",
1.152 stevesk 1001: len, (u_char *)buffer_ptr(&command), id);
1.170 markus 1002: }
1003:
1004: void
1.206 markus 1005: client_global_request_reply_fwd(int type, u_int32_t seq, void *ctxt)
1.170 markus 1006: {
1007: int i;
1008:
1009: i = client_global_request_id++;
1.206 markus 1010: if (i >= options.num_remote_forwards)
1.170 markus 1011: return;
1012: debug("remote forward %s for: listen %d, connect %s:%d",
1013: type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
1.232 djm 1014: options.remote_forwards[i].listen_port,
1015: options.remote_forwards[i].connect_host,
1016: options.remote_forwards[i].connect_port);
1.283 markus 1017: if (type == SSH2_MSG_REQUEST_FAILURE) {
1018: if (options.exit_on_forward_failure)
1019: fatal("Error: remote port forwarding failed for "
1020: "listen port %d",
1021: options.remote_forwards[i].listen_port);
1022: else
1023: logit("Warning: remote port forwarding failed for "
1024: "listen port %d",
1025: options.remote_forwards[i].listen_port);
1026: }
1.89 markus 1027: }
1028:
1.126 itojun 1029: static void
1.214 djm 1030: ssh_control_listener(void)
1.45 markus 1031: {
1.214 djm 1032: struct sockaddr_un addr;
1033: mode_t old_umask;
1.223 deraadt 1034:
1.242 djm 1035: if (options.control_path == NULL ||
1036: options.control_master == SSHCTL_MASTER_NO)
1.214 djm 1037: return;
1038:
1.242 djm 1039: debug("setting up multiplex master socket");
1040:
1.214 djm 1041: memset(&addr, '\0', sizeof(addr));
1042: addr.sun_family = AF_UNIX;
1043: addr.sun_len = offsetof(struct sockaddr_un, sun_path) +
1044: strlen(options.control_path) + 1;
1045:
1046: if (strlcpy(addr.sun_path, options.control_path,
1047: sizeof(addr.sun_path)) >= sizeof(addr.sun_path))
1048: fatal("ControlPath too long");
1049:
1050: if ((control_fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0)
1.252 stevesk 1051: fatal("%s socket(): %s", __func__, strerror(errno));
1.214 djm 1052:
1053: old_umask = umask(0177);
1.270 deraadt 1054: if (bind(control_fd, (struct sockaddr *)&addr, addr.sun_len) == -1) {
1.214 djm 1055: control_fd = -1;
1.238 djm 1056: if (errno == EINVAL || errno == EADDRINUSE)
1.214 djm 1057: fatal("ControlSocket %s already exists",
1058: options.control_path);
1059: else
1.252 stevesk 1060: fatal("%s bind(): %s", __func__, strerror(errno));
1.214 djm 1061: }
1062: umask(old_umask);
1.80 markus 1063:
1.214 djm 1064: if (listen(control_fd, 64) == -1)
1.252 stevesk 1065: fatal("%s listen(): %s", __func__, strerror(errno));
1.31 markus 1066:
1.214 djm 1067: set_nonblock(control_fd);
1068: }
1.45 markus 1069:
1.214 djm 1070: /* request pty/x11/agent/tcpfwd/shell for channel */
1071: static void
1072: ssh_session2_setup(int id, void *arg)
1073: {
1.215 djm 1074: extern char **environ;
1.243 djm 1075: const char *display;
1076: int interactive = tty_flag;
1.215 djm 1077:
1.248 djm 1078: display = getenv("DISPLAY");
1.243 djm 1079: if (options.forward_x11 && display != NULL) {
1.150 stevesk 1080: char *proto, *data;
1.50 markus 1081: /* Get reasonable local authentication information. */
1.243 djm 1082: client_x11_get_proto(display, options.xauth_location,
1083: options.forward_x11_trusted, &proto, &data);
1.50 markus 1084: /* Request forwarding with authentication spoofing. */
1085: debug("Requesting X11 forwarding with authentication spoofing.");
1.243 djm 1086: x11_request_forwarding_with_spoofing(id, display, proto, data);
1.80 markus 1087: interactive = 1;
1.50 markus 1088: /* XXX wait for reply */
1089: }
1090:
1.70 markus 1091: check_agent_present();
1092: if (options.forward_agent) {
1093: debug("Requesting authentication agent forwarding.");
1094: channel_request_start(id, "auth-agent-req@openssh.com", 0);
1095: packet_send();
1.212 djm 1096: }
1097:
1.256 reyk 1098: if (options.tun_open != SSH_TUNMODE_NO) {
1.255 reyk 1099: Channel *c;
1100: int fd;
1101:
1102: debug("Requesting tun.");
1.256 reyk 1103: if ((fd = tun_open(options.tun_local,
1104: options.tun_open)) >= 0) {
1.255 reyk 1105: c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1,
1106: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT,
1107: 0, "tun", 1);
1108: c->datagram = 1;
1109: packet_start(SSH2_MSG_CHANNEL_OPEN);
1110: packet_put_cstring("tun@openssh.com");
1111: packet_put_int(c->self);
1112: packet_put_int(c->local_window_max);
1113: packet_put_int(c->local_maxpacket);
1.256 reyk 1114: packet_put_int(options.tun_open);
1.255 reyk 1115: packet_put_int(options.tun_remote);
1116: packet_send();
1117: }
1118: }
1119:
1.214 djm 1120: client_session2_setup(id, tty_flag, subsystem_flag, getenv("TERM"),
1.215 djm 1121: NULL, fileno(stdin), &command, environ, &ssh_subsystem_reply);
1.90 markus 1122:
1.80 markus 1123: packet_set_interactive(interactive);
1.45 markus 1124: }
1125:
1.143 markus 1126: /* open new channel for a session */
1.126 itojun 1127: static int
1.143 markus 1128: ssh_session2_open(void)
1.45 markus 1129: {
1.118 markus 1130: Channel *c;
1131: int window, packetmax, in, out, err;
1.60 markus 1132:
1.62 markus 1133: if (stdin_null_flag) {
1.93 itojun 1134: in = open(_PATH_DEVNULL, O_RDONLY);
1.62 markus 1135: } else {
1136: in = dup(STDIN_FILENO);
1137: }
1.60 markus 1138: out = dup(STDOUT_FILENO);
1139: err = dup(STDERR_FILENO);
1.45 markus 1140:
1141: if (in < 0 || out < 0 || err < 0)
1.62 markus 1142: fatal("dup() in/out/err failed");
1.45 markus 1143:
1.69 markus 1144: /* enable nonblocking unless tty */
1145: if (!isatty(in))
1146: set_nonblock(in);
1147: if (!isatty(out))
1148: set_nonblock(out);
1149: if (!isatty(err))
1150: set_nonblock(err);
1151:
1.65 markus 1152: window = CHAN_SES_WINDOW_DEFAULT;
1153: packetmax = CHAN_SES_PACKET_DEFAULT;
1.164 markus 1154: if (tty_flag) {
1155: window >>= 1;
1156: packetmax >>= 1;
1.45 markus 1157: }
1.118 markus 1158: c = channel_new(
1.45 markus 1159: "session", SSH_CHANNEL_OPENING, in, out, err,
1.65 markus 1160: window, packetmax, CHAN_EXTENDED_WRITE,
1.192 markus 1161: "client-session", /*nonblock*/0);
1.45 markus 1162:
1.143 markus 1163: debug3("ssh_session2_open: channel_new: %d", c->self);
1.106 markus 1164:
1.122 markus 1165: channel_send_open(c->self);
1.143 markus 1166: if (!no_shell_flag)
1.214 djm 1167: channel_register_confirm(c->self, ssh_session2_setup, NULL);
1.106 markus 1168:
1.118 markus 1169: return c->self;
1.106 markus 1170: }
1171:
1.126 itojun 1172: static int
1.106 markus 1173: ssh_session2(void)
1174: {
1.143 markus 1175: int id = -1;
1.106 markus 1176:
1177: /* XXX should be pre-session */
1178: ssh_init_forwarding();
1.214 djm 1179: ssh_control_listener();
1.106 markus 1180:
1.143 markus 1181: if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN))
1182: id = ssh_session2_open();
1.255 reyk 1183:
1184: /* Execute a local command */
1185: if (options.local_command != NULL &&
1186: options.permit_local_command)
1187: ssh_local_cmd(options.local_command);
1.106 markus 1188:
1189: /* If requested, let ssh continue in the background. */
1190: if (fork_after_authentication_flag)
1191: if (daemon(1, 1) < 0)
1192: fatal("daemon() failed: %.200s", strerror(errno));
1.31 markus 1193:
1.119 stevesk 1194: return client_loop(tty_flag, tty_flag ?
1195: options.escape_char : SSH_ESCAPECHAR_NONE, id);
1.72 markus 1196: }
1197:
1.126 itojun 1198: static void
1.104 markus 1199: load_public_identity_files(void)
1200: {
1.275 djm 1201: char *filename, *cp, thishost[NI_MAXHOST];
1.167 markus 1202: int i = 0;
1.104 markus 1203: Key *public;
1.275 djm 1204: struct passwd *pw;
1.167 markus 1205: #ifdef SMARTCARD
1206: Key **keys;
1.104 markus 1207:
1.133 markus 1208: if (options.smartcard_device != NULL &&
1.167 markus 1209: options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
1.292 stevesk 1210: (keys = sc_get_keys(options.smartcard_device, NULL)) != NULL) {
1.167 markus 1211: int count = 0;
1212: for (i = 0; keys[i] != NULL; i++) {
1213: count++;
1214: memmove(&options.identity_files[1], &options.identity_files[0],
1215: sizeof(char *) * (SSH_MAX_IDENTITY_FILES - 1));
1216: memmove(&options.identity_keys[1], &options.identity_keys[0],
1217: sizeof(Key *) * (SSH_MAX_IDENTITY_FILES - 1));
1218: options.num_identity_files++;
1219: options.identity_keys[0] = keys[i];
1.194 markus 1220: options.identity_files[0] = sc_get_key_label(keys[i]);
1.167 markus 1221: }
1.168 markus 1222: if (options.num_identity_files > SSH_MAX_IDENTITY_FILES)
1223: options.num_identity_files = SSH_MAX_IDENTITY_FILES;
1.167 markus 1224: i = count;
1225: xfree(keys);
1.127 markus 1226: }
1.136 jakob 1227: #endif /* SMARTCARD */
1.275 djm 1228: if ((pw = getpwuid(original_real_uid)) == NULL)
1229: fatal("load_public_identity_files: getpwuid failed");
1230: if (gethostname(thishost, sizeof(thishost)) == -1)
1231: fatal("load_public_identity_files: gethostname: %s",
1232: strerror(errno));
1.131 millert 1233: for (; i < options.num_identity_files; i++) {
1.275 djm 1234: cp = tilde_expand_filename(options.identity_files[i],
1.131 millert 1235: original_real_uid);
1.275 djm 1236: filename = percent_expand(cp, "d", pw->pw_dir,
1.293 deraadt 1237: "u", pw->pw_name, "l", thishost, "h", host,
1.275 djm 1238: "r", options.user, (char *)NULL);
1239: xfree(cp);
1.131 millert 1240: public = key_load_public(filename, NULL);
1241: debug("identity file %s type %d", filename,
1242: public ? public->type : -1);
1243: xfree(options.identity_files[i]);
1244: options.identity_files[i] = filename;
1245: options.identity_keys[i] = public;
1246: }
1.214 djm 1247: }
1248:
1249: static void
1250: control_client_sighandler(int signo)
1251: {
1252: control_client_terminate = signo;
1253: }
1254:
1255: static void
1256: control_client_sigrelay(int signo)
1257: {
1258: if (control_server_pid > 1)
1259: kill(control_server_pid, signo);
1260: }
1261:
1.220 djm 1262: static int
1263: env_permitted(char *env)
1264: {
1.282 dtucker 1265: int i, ret;
1.220 djm 1266: char name[1024], *cp;
1267:
1.282 dtucker 1268: if ((cp = strchr(env, '=')) == NULL || cp == env)
1.220 djm 1269: return (0);
1.284 stevesk 1270: ret = snprintf(name, sizeof(name), "%.*s", (int)(cp - env), env);
1.282 dtucker 1271: if (ret <= 0 || (size_t)ret >= sizeof(name))
1272: fatal("env_permitted: name '%.100s...' too long", env);
1.220 djm 1273:
1274: for (i = 0; i < options.num_send_env; i++)
1275: if (match_pattern(name, options.send_env[i]))
1276: return (1);
1277:
1278: return (0);
1279: }
1280:
1.214 djm 1281: static void
1282: control_client(const char *path)
1283: {
1284: struct sockaddr_un addr;
1.228 djm 1285: int i, r, fd, sock, exitval, num_env;
1.214 djm 1286: Buffer m;
1.229 djm 1287: char *term;
1.215 djm 1288: extern char **environ;
1.229 djm 1289: u_int flags;
1.242 djm 1290:
1291: if (mux_command == 0)
1292: mux_command = SSHMUX_COMMAND_OPEN;
1293:
1294: switch (options.control_master) {
1295: case SSHCTL_MASTER_AUTO:
1296: case SSHCTL_MASTER_AUTO_ASK:
1297: debug("auto-mux: Trying existing master");
1298: /* FALLTHROUGH */
1299: case SSHCTL_MASTER_NO:
1300: break;
1301: default:
1302: return;
1303: }
1.228 djm 1304:
1.214 djm 1305: memset(&addr, '\0', sizeof(addr));
1306: addr.sun_family = AF_UNIX;
1307: addr.sun_len = offsetof(struct sockaddr_un, sun_path) +
1308: strlen(path) + 1;
1309:
1310: if (strlcpy(addr.sun_path, path,
1311: sizeof(addr.sun_path)) >= sizeof(addr.sun_path))
1312: fatal("ControlPath too long");
1313:
1314: if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) < 0)
1315: fatal("%s socket(): %s", __func__, strerror(errno));
1316:
1.270 deraadt 1317: if (connect(sock, (struct sockaddr *)&addr, addr.sun_len) == -1) {
1.240 djm 1318: if (mux_command != SSHMUX_COMMAND_OPEN) {
1319: fatal("Control socket connect(%.100s): %s", path,
1320: strerror(errno));
1321: }
1.239 djm 1322: if (errno == ENOENT)
1.268 deraadt 1323: debug("Control socket \"%.100s\" does not exist", path);
1.239 djm 1324: else {
1.268 deraadt 1325: error("Control socket connect(%.100s): %s", path,
1.239 djm 1326: strerror(errno));
1327: }
1.268 deraadt 1328: close(sock);
1329: return;
1330: }
1.248 djm 1331:
1.268 deraadt 1332: if (stdin_null_flag) {
1333: if ((fd = open(_PATH_DEVNULL, O_RDONLY)) == -1)
1334: fatal("open(/dev/null): %s", strerror(errno));
1335: if (dup2(fd, STDIN_FILENO) == -1)
1336: fatal("dup2: %s", strerror(errno));
1337: if (fd > STDERR_FILENO)
1338: close(fd);
1339: }
1.248 djm 1340:
1.247 djm 1341: term = getenv("TERM");
1.229 djm 1342:
1343: flags = 0;
1344: if (tty_flag)
1345: flags |= SSHMUX_FLAG_TTY;
1346: if (subsystem_flag)
1347: flags |= SSHMUX_FLAG_SUBSYS;
1.247 djm 1348: if (options.forward_x11)
1349: flags |= SSHMUX_FLAG_X11_FWD;
1350: if (options.forward_agent)
1351: flags |= SSHMUX_FLAG_AGENT_FWD;
1.214 djm 1352:
1353: buffer_init(&m);
1354:
1.229 djm 1355: /* Send our command to server */
1356: buffer_put_int(&m, mux_command);
1357: buffer_put_int(&m, flags);
1.247 djm 1358: if (ssh_msg_send(sock, SSHMUX_VER, &m) == -1)
1.229 djm 1359: fatal("%s: msg_send", __func__);
1360: buffer_clear(&m);
1361:
1362: /* Get authorisation status and PID of controlee */
1.214 djm 1363: if (ssh_msg_recv(sock, &m) == -1)
1364: fatal("%s: msg_recv", __func__);
1.247 djm 1365: if (buffer_get_char(&m) != SSHMUX_VER)
1.214 djm 1366: fatal("%s: wrong version", __func__);
1.216 djm 1367: if (buffer_get_int(&m) != 1)
1368: fatal("Connection to master denied");
1.214 djm 1369: control_server_pid = buffer_get_int(&m);
1370:
1371: buffer_clear(&m);
1372:
1.229 djm 1373: switch (mux_command) {
1374: case SSHMUX_COMMAND_ALIVE_CHECK:
1.234 deraadt 1375: fprintf(stderr, "Master running (pid=%d)\r\n",
1.229 djm 1376: control_server_pid);
1377: exit(0);
1378: case SSHMUX_COMMAND_TERMINATE:
1379: fprintf(stderr, "Exit request sent.\r\n");
1380: exit(0);
1381: case SSHMUX_COMMAND_OPEN:
1382: /* continue below */
1383: break;
1384: default:
1385: fatal("silly mux_command %d", mux_command);
1386: }
1387:
1388: /* SSHMUX_COMMAND_OPEN */
1.247 djm 1389: buffer_put_cstring(&m, term ? term : "");
1.214 djm 1390: buffer_append(&command, "\0", 1);
1391: buffer_put_cstring(&m, buffer_ptr(&command));
1.215 djm 1392:
1.220 djm 1393: if (options.num_send_env == 0 || environ == NULL) {
1394: buffer_put_int(&m, 0);
1.223 deraadt 1395: } else {
1.220 djm 1396: /* Pass environment */
1397: num_env = 0;
1398: for (i = 0; environ[i] != NULL; i++)
1399: if (env_permitted(environ[i]))
1400: num_env++; /* Count */
1.223 deraadt 1401:
1.220 djm 1402: buffer_put_int(&m, num_env);
1403:
1.222 dtucker 1404: for (i = 0; environ[i] != NULL && num_env >= 0; i++)
1405: if (env_permitted(environ[i])) {
1406: num_env--;
1.220 djm 1407: buffer_put_cstring(&m, environ[i]);
1.222 dtucker 1408: }
1.220 djm 1409: }
1.214 djm 1410:
1.247 djm 1411: if (ssh_msg_send(sock, SSHMUX_VER, &m) == -1)
1.214 djm 1412: fatal("%s: msg_send", __func__);
1413:
1414: mm_send_fd(sock, STDIN_FILENO);
1415: mm_send_fd(sock, STDOUT_FILENO);
1416: mm_send_fd(sock, STDERR_FILENO);
1417:
1418: /* Wait for reply, so master has a chance to gather ttymodes */
1419: buffer_clear(&m);
1420: if (ssh_msg_recv(sock, &m) == -1)
1421: fatal("%s: msg_recv", __func__);
1.247 djm 1422: if (buffer_get_char(&m) != SSHMUX_VER)
1.229 djm 1423: fatal("%s: wrong version", __func__);
1.214 djm 1424: buffer_free(&m);
1.218 djm 1425:
1.226 djm 1426: signal(SIGHUP, control_client_sighandler);
1.218 djm 1427: signal(SIGINT, control_client_sighandler);
1428: signal(SIGTERM, control_client_sighandler);
1429: signal(SIGWINCH, control_client_sigrelay);
1.214 djm 1430:
1431: if (tty_flag)
1432: enter_raw_mode();
1433:
1434: /* Stick around until the controlee closes the client_fd */
1435: exitval = 0;
1436: for (;!control_client_terminate;) {
1437: r = read(sock, &exitval, sizeof(exitval));
1438: if (r == 0) {
1439: debug2("Received EOF from master");
1440: break;
1441: }
1442: if (r > 0)
1443: debug2("Received exit status from master %d", exitval);
1444: if (r == -1 && errno != EINTR)
1445: fatal("%s: read %s", __func__, strerror(errno));
1446: }
1447:
1448: if (control_client_terminate)
1449: debug2("Exiting on signal %d", control_client_terminate);
1450:
1451: close(sock);
1452:
1453: leave_raw_mode();
1454:
1455: if (tty_flag && options.log_level != SYSLOG_LEVEL_QUIET)
1456: fprintf(stderr, "Connection to master closed.\r\n");
1457:
1458: exit(exitval);
1.1 deraadt 1459: }
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