Annotation of src/usr.bin/ssh/ssh.c, Revision 1.299
1.299 ! djm 1: /* $OpenBSD: ssh.c,v 1.298 2007/06/12 11:45:27 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>
1.294 djm 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,
1.297 djm 180: "usage: ssh [-1246AaCfgKkMNnqsTtVvXxY] [-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,
1.297 djm 262: "1246ab:c:e:fgi:kl:m:no:p:qstvxACD:F:I:KL: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;
1.297 djm 315: break;
316: case 'K':
317: options.gss_authentication = 1;
318: options.gss_deleg_creds = 1;
1.31 markus 319: break;
320: case 'i':
321: if (stat(optarg, &st) < 0) {
1.128 fgsch 322: fprintf(stderr, "Warning: Identity file %s "
1.231 otto 323: "not accessible: %s.\n", optarg,
324: strerror(errno));
1.31 markus 325: break;
326: }
1.128 fgsch 327: if (options.num_identity_files >=
328: SSH_MAX_IDENTITY_FILES)
329: fatal("Too many identity files specified "
330: "(max %d)", SSH_MAX_IDENTITY_FILES);
331: options.identity_files[options.num_identity_files++] =
332: xstrdup(optarg);
1.31 markus 333: break;
1.127 markus 334: case 'I':
335: #ifdef SMARTCARD
1.133 markus 336: options.smartcard_device = xstrdup(optarg);
1.137 jakob 337: #else
1.127 markus 338: fprintf(stderr, "no support for smartcards.\n");
1.137 jakob 339: #endif
1.127 markus 340: break;
1.31 markus 341: case 't':
1.79 markus 342: if (tty_flag)
343: force_tty_flag = 1;
1.31 markus 344: tty_flag = 1;
345: break;
346: case 'v':
1.197 markus 347: if (debug_flag == 0) {
1.66 markus 348: debug_flag = 1;
349: options.log_level = SYSLOG_LEVEL_DEBUG1;
1.197 markus 350: } else {
351: if (options.log_level < SYSLOG_LEVEL_DEBUG3)
352: options.log_level++;
1.66 markus 353: break;
1.197 markus 354: }
1.227 deraadt 355: /* FALLTHROUGH */
1.31 markus 356: case 'V':
1.209 markus 357: fprintf(stderr, "%s, %s\n",
358: SSH_VERSION, SSLeay_version(SSLEAY_VERSION));
1.31 markus 359: if (opt == 'V')
360: exit(0);
361: break;
1.255 reyk 362: case 'w':
1.256 reyk 363: if (options.tun_open == -1)
364: options.tun_open = SSH_TUNMODE_DEFAULT;
1.255 reyk 365: options.tun_local = a2tun(optarg, &options.tun_remote);
1.256 reyk 366: if (options.tun_local == SSH_TUNID_ERR) {
1.255 reyk 367: fprintf(stderr, "Bad tun device '%s'\n", optarg);
1.257 dtucker 368: exit(255);
1.255 reyk 369: }
370: break;
1.31 markus 371: case 'q':
372: options.log_level = SYSLOG_LEVEL_QUIET;
373: break;
374: case 'e':
375: if (optarg[0] == '^' && optarg[2] == 0 &&
1.128 fgsch 376: (u_char) optarg[1] >= 64 &&
377: (u_char) optarg[1] < 128)
1.78 markus 378: options.escape_char = (u_char) optarg[1] & 31;
1.31 markus 379: else if (strlen(optarg) == 1)
1.78 markus 380: options.escape_char = (u_char) optarg[0];
1.31 markus 381: else if (strcmp(optarg, "none") == 0)
1.119 stevesk 382: options.escape_char = SSH_ESCAPECHAR_NONE;
1.31 markus 383: else {
1.128 fgsch 384: fprintf(stderr, "Bad escape character '%s'.\n",
385: optarg);
1.257 dtucker 386: exit(255);
1.31 markus 387: }
388: break;
389: case 'c':
1.49 markus 390: if (ciphers_valid(optarg)) {
391: /* SSH2 only */
392: options.ciphers = xstrdup(optarg);
1.224 markus 393: options.cipher = SSH_CIPHER_INVALID;
1.49 markus 394: } else {
395: /* SSH1 only */
1.74 markus 396: options.cipher = cipher_number(optarg);
397: if (options.cipher == -1) {
1.128 fgsch 398: fprintf(stderr,
399: "Unknown cipher type '%s'\n",
400: optarg);
1.257 dtucker 401: exit(255);
1.49 markus 402: }
1.128 fgsch 403: if (options.cipher == SSH_CIPHER_3DES)
1.74 markus 404: options.ciphers = "3des-cbc";
1.128 fgsch 405: else if (options.cipher == SSH_CIPHER_BLOWFISH)
1.74 markus 406: options.ciphers = "blowfish-cbc";
1.128 fgsch 407: else
1.74 markus 408: options.ciphers = (char *)-1;
1.95 markus 409: }
410: break;
411: case 'm':
412: if (mac_valid(optarg))
413: options.macs = xstrdup(optarg);
414: else {
1.128 fgsch 415: fprintf(stderr, "Unknown mac type '%s'\n",
416: optarg);
1.257 dtucker 417: exit(255);
1.31 markus 418: }
419: break;
1.214 djm 420: case 'M':
1.242 djm 421: if (options.control_master == SSHCTL_MASTER_YES)
422: options.control_master = SSHCTL_MASTER_ASK;
423: else
424: options.control_master = SSHCTL_MASTER_YES;
1.214 djm 425: break;
1.31 markus 426: case 'p':
1.113 stevesk 427: options.port = a2port(optarg);
428: if (options.port == 0) {
1.109 markus 429: fprintf(stderr, "Bad port '%s'\n", optarg);
1.257 dtucker 430: exit(255);
1.109 markus 431: }
1.31 markus 432: break;
433: case 'l':
434: options.user = optarg;
435: break;
1.141 stevesk 436:
437: case 'L':
1.232 djm 438: if (parse_forward(&fwd, optarg))
439: add_local_forward(&options, &fwd);
440: else {
1.128 fgsch 441: fprintf(stderr,
1.232 djm 442: "Bad local forwarding specification '%s'\n",
1.128 fgsch 443: optarg);
1.257 dtucker 444: exit(255);
1.31 markus 445: }
1.232 djm 446: break;
447:
448: case 'R':
449: if (parse_forward(&fwd, optarg)) {
450: add_remote_forward(&options, &fwd);
451: } else {
1.128 fgsch 452: fprintf(stderr,
1.232 djm 453: "Bad remote forwarding specification "
454: "'%s'\n", optarg);
1.257 dtucker 455: exit(255);
1.31 markus 456: }
457: break;
1.108 markus 458:
459: case 'D':
1.232 djm 460: cp = p = xstrdup(optarg);
461: memset(&fwd, '\0', sizeof(fwd));
462: fwd.connect_host = "socks";
463: if ((fwd.listen_host = hpdelim(&cp)) == NULL) {
464: fprintf(stderr, "Bad dynamic forwarding "
465: "specification '%.100s'\n", optarg);
1.257 dtucker 466: exit(255);
1.232 djm 467: }
468: if (cp != NULL) {
469: fwd.listen_port = a2port(cp);
470: fwd.listen_host = cleanhostname(fwd.listen_host);
471: } else {
472: fwd.listen_port = a2port(fwd.listen_host);
1.249 djm 473: fwd.listen_host = NULL;
1.232 djm 474: }
475:
476: if (fwd.listen_port == 0) {
1.128 fgsch 477: fprintf(stderr, "Bad dynamic port '%s'\n",
478: optarg);
1.257 dtucker 479: exit(255);
1.109 markus 480: }
1.232 djm 481: add_local_forward(&options, &fwd);
482: xfree(p);
1.108 markus 483: break;
484:
1.31 markus 485: case 'C':
486: options.compression = 1;
487: break;
1.45 markus 488: case 'N':
489: no_shell_flag = 1;
490: no_tty_flag = 1;
491: break;
492: case 'T':
493: no_tty_flag = 1;
494: break;
1.31 markus 495: case 'o':
496: dummy = 1;
1.205 markus 497: line = xstrdup(optarg);
1.128 fgsch 498: if (process_config_line(&options, host ? host : "",
1.205 markus 499: line, "command-line", 0, &dummy) != 0)
1.257 dtucker 500: exit(255);
1.205 markus 501: xfree(line);
1.31 markus 502: break;
1.85 djm 503: case 's':
504: subsystem_flag = 1;
1.117 markus 505: break;
1.214 djm 506: case 'S':
507: if (options.control_path != NULL)
508: free(options.control_path);
509: options.control_path = xstrdup(optarg);
510: break;
1.117 markus 511: case 'b':
512: options.bind_address = optarg;
1.85 djm 513: break;
1.139 markus 514: case 'F':
515: config = optarg;
516: break;
1.31 markus 517: default:
518: usage();
1.1 deraadt 519: }
1.31 markus 520: }
521:
1.128 fgsch 522: ac -= optind;
523: av += optind;
524:
525: if (ac > 0 && !host && **av != '-') {
1.188 markus 526: if (strrchr(*av, '@')) {
1.128 fgsch 527: p = xstrdup(*av);
1.188 markus 528: cp = strrchr(p, '@');
1.128 fgsch 529: if (cp == NULL || cp == p)
530: usage();
531: options.user = p;
532: *cp = '\0';
533: host = ++cp;
534: } else
535: host = *av;
1.189 millert 536: if (ac > 1) {
537: optind = optreset = 1;
1.128 fgsch 538: goto again;
539: }
1.189 millert 540: ac--, av++;
1.128 fgsch 541: }
542:
1.31 markus 543: /* Check that we got a host name. */
544: if (!host)
545: usage();
546:
1.54 markus 547: SSLeay_add_all_algorithms();
1.72 markus 548: ERR_load_crypto_strings();
1.31 markus 549:
550: /* Initialize the command to execute on remote host. */
551: buffer_init(&command);
1.1 deraadt 552:
1.33 markus 553: /*
554: * Save the command to execute on the remote host in a buffer. There
555: * is no limit on the length of the command, except by the maximum
556: * packet size. Also sets the tty flag if there is no command.
557: */
1.128 fgsch 558: if (!ac) {
1.31 markus 559: /* No command specified - execute shell on a tty. */
560: tty_flag = 1;
1.85 djm 561: if (subsystem_flag) {
1.128 fgsch 562: fprintf(stderr,
563: "You must specify a subsystem to invoke.\n");
1.85 djm 564: usage();
565: }
1.31 markus 566: } else {
1.128 fgsch 567: /* A command has been specified. Store it into the buffer. */
568: for (i = 0; i < ac; i++) {
569: if (i)
1.31 markus 570: buffer_append(&command, " ", 1);
571: buffer_append(&command, av[i], strlen(av[i]));
572: }
573: }
574:
575: /* Cannot fork to background if no command. */
1.63 markus 576: if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag)
1.31 markus 577: fatal("Cannot fork into background without a command to execute.");
578:
579: /* Allocate a tty by default if no command specified. */
580: if (buffer_len(&command) == 0)
581: tty_flag = 1;
582:
1.180 deraadt 583: /* Force no tty */
1.75 markus 584: if (no_tty_flag)
585: tty_flag = 0;
1.31 markus 586: /* Do not allocate a tty if stdin is not a tty. */
1.236 djm 587: if ((!isatty(fileno(stdin)) || stdin_null_flag) && !force_tty_flag) {
1.31 markus 588: if (tty_flag)
1.191 itojun 589: logit("Pseudo-terminal will not be allocated because stdin is not a terminal.");
1.31 markus 590: tty_flag = 0;
591: }
1.45 markus 592:
1.101 markus 593: /*
594: * Initialize "log" output. Since we are the client all output
595: * actually goes to stderr.
596: */
1.111 markus 597: log_init(av[0], options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level,
598: SYSLOG_FACILITY_USER, 1);
1.31 markus 599:
1.139 markus 600: /*
601: * Read per-user configuration file. Ignore the system wide config
602: * file if the user specifies a config file on the command line.
603: */
604: if (config != NULL) {
1.211 djm 605: if (!read_config_file(config, host, &options, 0))
1.142 stevesk 606: fatal("Can't open user config file %.100s: "
607: "%.100s", config, strerror(errno));
1.295 stevesk 608: } else {
1.139 markus 609: snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir,
610: _PATH_SSH_USER_CONFFILE);
1.210 djm 611: (void)read_config_file(buf, host, &options, 1);
1.139 markus 612:
1.145 markus 613: /* Read systemwide configuration file after use config. */
1.223 deraadt 614: (void)read_config_file(_PATH_HOST_CONFIG_FILE, host,
1.210 djm 615: &options, 0);
1.139 markus 616: }
1.31 markus 617:
618: /* Fill configuration defaults. */
619: fill_default_options(&options);
620:
1.196 djm 621: channel_set_af(options.address_family);
622:
1.31 markus 623: /* reinit */
1.101 markus 624: log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 1);
1.31 markus 625:
626: if (options.user == NULL)
627: options.user = xstrdup(pw->pw_name);
628:
629: if (options.hostname != NULL)
630: host = options.hostname;
1.195 markus 631:
632: /* force lowercase for hostkey matching */
633: if (options.host_key_alias != NULL) {
634: for (p = options.host_key_alias; *p; p++)
635: if (isupper(*p))
1.271 deraadt 636: *p = (char)tolower(*p);
1.195 markus 637: }
1.190 markus 638:
1.246 djm 639: /* Get default port if port has not been set. */
640: if (options.port == 0) {
641: sp = getservbyname(SSH_SERVICE_NAME, "tcp");
642: options.port = sp ? ntohs(sp->s_port) : SSH_DEFAULT_PORT;
643: }
644:
1.190 markus 645: if (options.proxy_command != NULL &&
646: strcmp(options.proxy_command, "none") == 0)
647: options.proxy_command = NULL;
1.245 djm 648: if (options.control_path != NULL &&
649: strcmp(options.control_path, "none") == 0)
650: options.control_path = NULL;
1.31 markus 651:
1.214 djm 652: if (options.control_path != NULL) {
1.275 djm 653: char thishost[NI_MAXHOST];
1.261 djm 654:
1.275 djm 655: if (gethostname(thishost, sizeof(thishost)) == -1)
1.261 djm 656: fatal("gethostname: %s", strerror(errno));
1.241 djm 657: snprintf(buf, sizeof(buf), "%d", options.port);
658: cp = tilde_expand_filename(options.control_path,
659: original_real_uid);
660: options.control_path = percent_expand(cp, "p", buf, "h", host,
1.275 djm 661: "r", options.user, "l", thishost, (char *)NULL);
1.241 djm 662: xfree(cp);
1.214 djm 663: }
1.240 djm 664: if (mux_command != 0 && options.control_path == NULL)
665: fatal("No ControlPath specified for \"-O\" command");
1.242 djm 666: if (options.control_path != NULL)
1.237 jakob 667: control_client(options.control_path);
1.214 djm 668:
1.77 markus 669: /* Open a connection to the remote host. */
1.203 djm 670: if (ssh_connect(host, &hostaddr, options.port,
1.196 djm 671: options.address_family, options.connection_attempts,
1.177 markus 672: original_effective_uid == 0 && options.use_privileged_port,
1.179 markus 673: options.proxy_command) != 0)
1.257 dtucker 674: exit(255);
1.31 markus 675:
1.33 markus 676: /*
677: * If we successfully made the connection, load the host private key
678: * in case we will need it later for combined rsa-rhosts
679: * authentication. This must be done before releasing extra
680: * privileges, because the file is only readable by root.
1.174 markus 681: * If we cannot access the private keys, load the public keys
682: * instead and try to execute the ssh-keysign helper instead.
1.33 markus 683: */
1.112 markus 684: sensitive_data.nkeys = 0;
685: sensitive_data.keys = NULL;
1.173 markus 686: sensitive_data.external_keysign = 0;
1.178 markus 687: if (options.rhosts_rsa_authentication ||
688: options.hostbased_authentication) {
1.112 markus 689: sensitive_data.nkeys = 3;
1.274 deraadt 690: sensitive_data.keys = xcalloc(sensitive_data.nkeys,
1.180 deraadt 691: sizeof(Key));
1.177 markus 692:
693: PRIV_START;
1.112 markus 694: sensitive_data.keys[0] = key_load_private_type(KEY_RSA1,
1.276 dtucker 695: _PATH_HOST_KEY_FILE, "", NULL, NULL);
1.112 markus 696: sensitive_data.keys[1] = key_load_private_type(KEY_DSA,
1.276 dtucker 697: _PATH_HOST_DSA_KEY_FILE, "", NULL, NULL);
1.112 markus 698: sensitive_data.keys[2] = key_load_private_type(KEY_RSA,
1.276 dtucker 699: _PATH_HOST_RSA_KEY_FILE, "", NULL, NULL);
1.177 markus 700: PRIV_END;
1.173 markus 701:
1.181 markus 702: if (options.hostbased_authentication == 1 &&
703: sensitive_data.keys[0] == NULL &&
1.173 markus 704: sensitive_data.keys[1] == NULL &&
705: sensitive_data.keys[2] == NULL) {
706: sensitive_data.keys[1] = key_load_public(
707: _PATH_HOST_DSA_KEY_FILE, NULL);
708: sensitive_data.keys[2] = key_load_public(
709: _PATH_HOST_RSA_KEY_FILE, NULL);
710: sensitive_data.external_keysign = 1;
711: }
1.31 markus 712: }
1.33 markus 713: /*
714: * Get rid of any extra privileges that we may have. We will no
715: * longer need them. Also, extra privileges could make it very hard
716: * to read identity files and other non-world-readable files from the
717: * user's home directory if it happens to be on a NFS volume where
718: * root is mapped to nobody.
719: */
1.225 dtucker 720: if (original_effective_uid == 0) {
721: PRIV_START;
722: permanently_set_uid(pw);
723: }
1.31 markus 724:
1.33 markus 725: /*
726: * Now that we are back to our own permissions, create ~/.ssh
1.254 djm 727: * directory if it doesn't already exist.
1.33 markus 728: */
1.138 jakob 729: snprintf(buf, sizeof buf, "%.100s%s%.100s", pw->pw_dir, strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR);
1.31 markus 730: if (stat(buf, &st) < 0)
1.57 djm 731: if (mkdir(buf, 0700) < 0)
1.31 markus 732: error("Could not create directory '%.200s'.", buf);
733:
1.104 markus 734: /* load options.identity_files */
735: load_public_identity_files();
736:
737: /* Expand ~ in known host file names. */
738: /* XXX mem-leaks: */
1.72 markus 739: options.system_hostfile =
740: tilde_expand_filename(options.system_hostfile, original_real_uid);
741: options.user_hostfile =
742: tilde_expand_filename(options.user_hostfile, original_real_uid);
743: options.system_hostfile2 =
744: tilde_expand_filename(options.system_hostfile2, original_real_uid);
745: options.user_hostfile2 =
746: tilde_expand_filename(options.user_hostfile2, original_real_uid);
1.149 markus 747:
748: signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
1.31 markus 749:
750: /* Log into the remote system. This never returns if the login fails. */
1.173 markus 751: ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr, pw);
1.31 markus 752:
1.112 markus 753: /* We no longer need the private host keys. Clear them now. */
754: if (sensitive_data.nkeys != 0) {
755: for (i = 0; i < sensitive_data.nkeys; i++) {
756: if (sensitive_data.keys[i] != NULL) {
757: /* Destroys contents safely */
758: debug3("clear hostkey %d", i);
759: key_free(sensitive_data.keys[i]);
760: sensitive_data.keys[i] = NULL;
761: }
762: }
763: xfree(sensitive_data.keys);
1.134 markus 764: }
765: for (i = 0; i < options.num_identity_files; i++) {
766: if (options.identity_files[i]) {
767: xfree(options.identity_files[i]);
768: options.identity_files[i] = NULL;
769: }
770: if (options.identity_keys[i]) {
771: key_free(options.identity_keys[i]);
772: options.identity_keys[i] = NULL;
773: }
1.112 markus 774: }
1.31 markus 775:
1.45 markus 776: exit_status = compat20 ? ssh_session2() : ssh_session();
777: packet_close();
1.186 djm 778:
1.214 djm 779: if (options.control_path != NULL && control_fd != -1)
780: unlink(options.control_path);
781:
1.186 djm 782: /*
1.203 djm 783: * Send SIGHUP to proxy command if used. We don't wait() in
1.186 djm 784: * case it hangs and instead rely on init to reap the child
785: */
786: if (proxy_command_pid > 1)
787: kill(proxy_command_pid, SIGHUP);
788:
1.45 markus 789: return exit_status;
790: }
791:
1.126 itojun 792: static void
1.70 markus 793: ssh_init_forwarding(void)
794: {
1.86 markus 795: int success = 0;
1.70 markus 796: int i;
1.86 markus 797:
1.70 markus 798: /* Initiate local TCP/IP port forwardings. */
799: for (i = 0; i < options.num_local_forwards; i++) {
1.232 djm 800: debug("Local connections to %.200s:%d forwarded to remote "
801: "address %.200s:%d",
1.234 deraadt 802: (options.local_forwards[i].listen_host == NULL) ?
803: (options.gateway_ports ? "*" : "LOCALHOST") :
1.232 djm 804: options.local_forwards[i].listen_host,
805: options.local_forwards[i].listen_port,
806: options.local_forwards[i].connect_host,
807: options.local_forwards[i].connect_port);
1.158 markus 808: success += channel_setup_local_fwd_listener(
1.232 djm 809: options.local_forwards[i].listen_host,
810: options.local_forwards[i].listen_port,
811: options.local_forwards[i].connect_host,
812: options.local_forwards[i].connect_port,
1.70 markus 813: options.gateway_ports);
814: }
1.283 markus 815: if (i > 0 && success != i && options.exit_on_forward_failure)
816: fatal("Could not request local forwarding.");
1.86 markus 817: if (i > 0 && success == 0)
818: error("Could not request local forwarding.");
1.70 markus 819:
820: /* Initiate remote TCP/IP port forwardings. */
821: for (i = 0; i < options.num_remote_forwards; i++) {
1.232 djm 822: debug("Remote connections from %.200s:%d forwarded to "
823: "local address %.200s:%d",
1.248 djm 824: (options.remote_forwards[i].listen_host == NULL) ?
1.253 djm 825: "LOCALHOST" : options.remote_forwards[i].listen_host,
1.232 djm 826: options.remote_forwards[i].listen_port,
827: options.remote_forwards[i].connect_host,
828: options.remote_forwards[i].connect_port);
1.283 markus 829: if (channel_request_remote_forwarding(
1.232 djm 830: options.remote_forwards[i].listen_host,
831: options.remote_forwards[i].listen_port,
832: options.remote_forwards[i].connect_host,
1.283 markus 833: options.remote_forwards[i].connect_port) < 0) {
834: if (options.exit_on_forward_failure)
835: fatal("Could not request remote forwarding.");
836: else
837: logit("Warning: Could not request remote "
838: "forwarding.");
839: }
1.70 markus 840: }
841: }
842:
1.126 itojun 843: static void
1.70 markus 844: check_agent_present(void)
845: {
846: if (options.forward_agent) {
1.254 djm 847: /* Clear agent forwarding if we don't have an agent. */
1.185 stevesk 848: if (!ssh_agent_present())
1.70 markus 849: options.forward_agent = 0;
850: }
851: }
852:
1.126 itojun 853: static int
1.45 markus 854: ssh_session(void)
855: {
856: int type;
857: int interactive = 0;
858: int have_tty = 0;
859: struct winsize ws;
860: char *cp;
1.243 djm 861: const char *display;
1.45 markus 862:
1.31 markus 863: /* Enable compression if requested. */
864: if (options.compression) {
865: debug("Requesting compression at level %d.", options.compression_level);
866:
867: if (options.compression_level < 1 || options.compression_level > 9)
868: fatal("Compression level must be from 1 (fast) to 9 (slow, best).");
869:
870: /* Send the request. */
871: packet_start(SSH_CMSG_REQUEST_COMPRESSION);
872: packet_put_int(options.compression_level);
873: packet_send();
874: packet_write_wait();
1.156 markus 875: type = packet_read();
1.31 markus 876: if (type == SSH_SMSG_SUCCESS)
877: packet_start_compression(options.compression_level);
878: else if (type == SSH_SMSG_FAILURE)
1.191 itojun 879: logit("Warning: Remote host refused compression.");
1.31 markus 880: else
881: packet_disconnect("Protocol error waiting for compression response.");
882: }
883: /* Allocate a pseudo tty if appropriate. */
884: if (tty_flag) {
885: debug("Requesting pty.");
886:
887: /* Start the packet. */
888: packet_start(SSH_CMSG_REQUEST_PTY);
889:
890: /* Store TERM in the packet. There is no limit on the
891: length of the string. */
892: cp = getenv("TERM");
893: if (!cp)
894: cp = "";
1.124 markus 895: packet_put_cstring(cp);
1.31 markus 896:
897: /* Store window size in the packet. */
898: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
899: memset(&ws, 0, sizeof(ws));
1.269 deraadt 900: packet_put_int((u_int)ws.ws_row);
901: packet_put_int((u_int)ws.ws_col);
902: packet_put_int((u_int)ws.ws_xpixel);
903: packet_put_int((u_int)ws.ws_ypixel);
1.31 markus 904:
905: /* Store tty modes in the packet. */
1.115 stevesk 906: tty_make_modes(fileno(stdin), NULL);
1.31 markus 907:
908: /* Send the packet, and wait for it to leave. */
909: packet_send();
910: packet_write_wait();
911:
912: /* Read response from the server. */
1.156 markus 913: type = packet_read();
1.43 markus 914: if (type == SSH_SMSG_SUCCESS) {
1.31 markus 915: interactive = 1;
1.45 markus 916: have_tty = 1;
1.43 markus 917: } else if (type == SSH_SMSG_FAILURE)
1.191 itojun 918: logit("Warning: Remote host failed or refused to allocate a pseudo tty.");
1.31 markus 919: else
920: packet_disconnect("Protocol error waiting for pty request response.");
921: }
922: /* Request X11 forwarding if enabled and DISPLAY is set. */
1.243 djm 923: display = getenv("DISPLAY");
924: if (options.forward_x11 && display != NULL) {
1.150 stevesk 925: char *proto, *data;
1.50 markus 926: /* Get reasonable local authentication information. */
1.243 djm 927: client_x11_get_proto(display, options.xauth_location,
928: options.forward_x11_trusted, &proto, &data);
1.50 markus 929: /* Request forwarding with authentication spoofing. */
1.31 markus 930: debug("Requesting X11 forwarding with authentication spoofing.");
1.243 djm 931: x11_request_forwarding_with_spoofing(0, display, proto, data);
1.31 markus 932:
933: /* Read response from the server. */
1.156 markus 934: type = packet_read();
1.31 markus 935: if (type == SSH_SMSG_SUCCESS) {
936: interactive = 1;
1.50 markus 937: } else if (type == SSH_SMSG_FAILURE) {
1.191 itojun 938: logit("Warning: Remote host denied X11 forwarding.");
1.50 markus 939: } else {
1.31 markus 940: packet_disconnect("Protocol error waiting for X11 forwarding");
1.50 markus 941: }
1.31 markus 942: }
943: /* Tell the packet module whether this is an interactive session. */
1.80 markus 944: packet_set_interactive(interactive);
1.31 markus 945:
946: /* Request authentication agent forwarding if appropriate. */
1.70 markus 947: check_agent_present();
948:
1.31 markus 949: if (options.forward_agent) {
950: debug("Requesting authentication agent forwarding.");
951: auth_request_forwarding();
952:
953: /* Read response from the server. */
1.156 markus 954: type = packet_read();
1.155 markus 955: packet_check_eom();
1.31 markus 956: if (type != SSH_SMSG_SUCCESS)
1.191 itojun 957: logit("Warning: Remote host denied authentication agent forwarding.");
1.31 markus 958: }
959:
1.70 markus 960: /* Initiate port forwardings. */
961: ssh_init_forwarding();
1.34 markus 962:
963: /* If requested, let ssh continue in the background. */
1.48 markus 964: if (fork_after_authentication_flag)
1.34 markus 965: if (daemon(1, 1) < 0)
966: fatal("daemon() failed: %.200s", strerror(errno));
1.31 markus 967:
1.33 markus 968: /*
969: * If a command was specified on the command line, execute the
970: * command now. Otherwise request the server to start a shell.
971: */
1.31 markus 972: if (buffer_len(&command) > 0) {
973: int len = buffer_len(&command);
974: if (len > 900)
975: len = 900;
1.152 stevesk 976: debug("Sending command: %.*s", len, (u_char *)buffer_ptr(&command));
1.31 markus 977: packet_start(SSH_CMSG_EXEC_CMD);
978: packet_put_string(buffer_ptr(&command), buffer_len(&command));
979: packet_send();
980: packet_write_wait();
981: } else {
982: debug("Requesting shell.");
983: packet_start(SSH_CMSG_EXEC_SHELL);
984: packet_send();
985: packet_write_wait();
986: }
987:
988: /* Enter the interactive session. */
1.119 stevesk 989: return client_loop(have_tty, tty_flag ?
990: options.escape_char : SSH_ESCAPECHAR_NONE, 0);
1.45 markus 991: }
992:
1.126 itojun 993: static void
1.214 djm 994: ssh_subsystem_reply(int type, u_int32_t seq, void *ctxt)
1.89 markus 995: {
996: int id, len;
997:
998: id = packet_get_int();
999: len = buffer_len(&command);
1.100 markus 1000: if (len > 900)
1001: len = 900;
1.155 markus 1002: packet_check_eom();
1.89 markus 1003: if (type == SSH2_MSG_CHANNEL_FAILURE)
1004: fatal("Request for subsystem '%.*s' failed on channel %d",
1.152 stevesk 1005: len, (u_char *)buffer_ptr(&command), id);
1.170 markus 1006: }
1007:
1008: void
1.206 markus 1009: client_global_request_reply_fwd(int type, u_int32_t seq, void *ctxt)
1.170 markus 1010: {
1011: int i;
1012:
1013: i = client_global_request_id++;
1.206 markus 1014: if (i >= options.num_remote_forwards)
1.170 markus 1015: return;
1016: debug("remote forward %s for: listen %d, connect %s:%d",
1017: type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
1.232 djm 1018: options.remote_forwards[i].listen_port,
1019: options.remote_forwards[i].connect_host,
1020: options.remote_forwards[i].connect_port);
1.283 markus 1021: if (type == SSH2_MSG_REQUEST_FAILURE) {
1022: if (options.exit_on_forward_failure)
1023: fatal("Error: remote port forwarding failed for "
1024: "listen port %d",
1025: options.remote_forwards[i].listen_port);
1026: else
1027: logit("Warning: remote port forwarding failed for "
1028: "listen port %d",
1029: options.remote_forwards[i].listen_port);
1030: }
1.89 markus 1031: }
1032:
1.126 itojun 1033: static void
1.214 djm 1034: ssh_control_listener(void)
1.45 markus 1035: {
1.214 djm 1036: struct sockaddr_un addr;
1037: mode_t old_umask;
1.223 deraadt 1038:
1.242 djm 1039: if (options.control_path == NULL ||
1040: options.control_master == SSHCTL_MASTER_NO)
1.214 djm 1041: return;
1042:
1.242 djm 1043: debug("setting up multiplex master socket");
1044:
1.214 djm 1045: memset(&addr, '\0', sizeof(addr));
1046: addr.sun_family = AF_UNIX;
1047: addr.sun_len = offsetof(struct sockaddr_un, sun_path) +
1048: strlen(options.control_path) + 1;
1049:
1050: if (strlcpy(addr.sun_path, options.control_path,
1051: sizeof(addr.sun_path)) >= sizeof(addr.sun_path))
1052: fatal("ControlPath too long");
1053:
1054: if ((control_fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0)
1.252 stevesk 1055: fatal("%s socket(): %s", __func__, strerror(errno));
1.214 djm 1056:
1057: old_umask = umask(0177);
1.270 deraadt 1058: if (bind(control_fd, (struct sockaddr *)&addr, addr.sun_len) == -1) {
1.214 djm 1059: control_fd = -1;
1.238 djm 1060: if (errno == EINVAL || errno == EADDRINUSE)
1.214 djm 1061: fatal("ControlSocket %s already exists",
1062: options.control_path);
1063: else
1.252 stevesk 1064: fatal("%s bind(): %s", __func__, strerror(errno));
1.214 djm 1065: }
1066: umask(old_umask);
1.80 markus 1067:
1.214 djm 1068: if (listen(control_fd, 64) == -1)
1.252 stevesk 1069: fatal("%s listen(): %s", __func__, strerror(errno));
1.31 markus 1070:
1.214 djm 1071: set_nonblock(control_fd);
1072: }
1.45 markus 1073:
1.214 djm 1074: /* request pty/x11/agent/tcpfwd/shell for channel */
1075: static void
1076: ssh_session2_setup(int id, void *arg)
1077: {
1.215 djm 1078: extern char **environ;
1.243 djm 1079: const char *display;
1080: int interactive = tty_flag;
1.215 djm 1081:
1.248 djm 1082: display = getenv("DISPLAY");
1.243 djm 1083: if (options.forward_x11 && display != NULL) {
1.150 stevesk 1084: char *proto, *data;
1.50 markus 1085: /* Get reasonable local authentication information. */
1.243 djm 1086: client_x11_get_proto(display, options.xauth_location,
1087: options.forward_x11_trusted, &proto, &data);
1.50 markus 1088: /* Request forwarding with authentication spoofing. */
1089: debug("Requesting X11 forwarding with authentication spoofing.");
1.243 djm 1090: x11_request_forwarding_with_spoofing(id, display, proto, data);
1.80 markus 1091: interactive = 1;
1.50 markus 1092: /* XXX wait for reply */
1093: }
1094:
1.70 markus 1095: check_agent_present();
1096: if (options.forward_agent) {
1097: debug("Requesting authentication agent forwarding.");
1098: channel_request_start(id, "auth-agent-req@openssh.com", 0);
1099: packet_send();
1.212 djm 1100: }
1101:
1.256 reyk 1102: if (options.tun_open != SSH_TUNMODE_NO) {
1.255 reyk 1103: Channel *c;
1104: int fd;
1105:
1106: debug("Requesting tun.");
1.256 reyk 1107: if ((fd = tun_open(options.tun_local,
1108: options.tun_open)) >= 0) {
1.255 reyk 1109: c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1,
1110: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT,
1111: 0, "tun", 1);
1112: c->datagram = 1;
1113: packet_start(SSH2_MSG_CHANNEL_OPEN);
1114: packet_put_cstring("tun@openssh.com");
1115: packet_put_int(c->self);
1116: packet_put_int(c->local_window_max);
1117: packet_put_int(c->local_maxpacket);
1.256 reyk 1118: packet_put_int(options.tun_open);
1.255 reyk 1119: packet_put_int(options.tun_remote);
1120: packet_send();
1121: }
1122: }
1123:
1.214 djm 1124: client_session2_setup(id, tty_flag, subsystem_flag, getenv("TERM"),
1.215 djm 1125: NULL, fileno(stdin), &command, environ, &ssh_subsystem_reply);
1.90 markus 1126:
1.80 markus 1127: packet_set_interactive(interactive);
1.45 markus 1128: }
1129:
1.143 markus 1130: /* open new channel for a session */
1.126 itojun 1131: static int
1.143 markus 1132: ssh_session2_open(void)
1.45 markus 1133: {
1.118 markus 1134: Channel *c;
1135: int window, packetmax, in, out, err;
1.60 markus 1136:
1.62 markus 1137: if (stdin_null_flag) {
1.93 itojun 1138: in = open(_PATH_DEVNULL, O_RDONLY);
1.62 markus 1139: } else {
1140: in = dup(STDIN_FILENO);
1141: }
1.60 markus 1142: out = dup(STDOUT_FILENO);
1143: err = dup(STDERR_FILENO);
1.45 markus 1144:
1145: if (in < 0 || out < 0 || err < 0)
1.62 markus 1146: fatal("dup() in/out/err failed");
1.45 markus 1147:
1.69 markus 1148: /* enable nonblocking unless tty */
1149: if (!isatty(in))
1150: set_nonblock(in);
1151: if (!isatty(out))
1152: set_nonblock(out);
1153: if (!isatty(err))
1154: set_nonblock(err);
1155:
1.65 markus 1156: window = CHAN_SES_WINDOW_DEFAULT;
1157: packetmax = CHAN_SES_PACKET_DEFAULT;
1.164 markus 1158: if (tty_flag) {
1159: window >>= 1;
1160: packetmax >>= 1;
1.45 markus 1161: }
1.118 markus 1162: c = channel_new(
1.45 markus 1163: "session", SSH_CHANNEL_OPENING, in, out, err,
1.65 markus 1164: window, packetmax, CHAN_EXTENDED_WRITE,
1.192 markus 1165: "client-session", /*nonblock*/0);
1.45 markus 1166:
1.143 markus 1167: debug3("ssh_session2_open: channel_new: %d", c->self);
1.106 markus 1168:
1.122 markus 1169: channel_send_open(c->self);
1.143 markus 1170: if (!no_shell_flag)
1.214 djm 1171: channel_register_confirm(c->self, ssh_session2_setup, NULL);
1.106 markus 1172:
1.118 markus 1173: return c->self;
1.106 markus 1174: }
1175:
1.126 itojun 1176: static int
1.106 markus 1177: ssh_session2(void)
1178: {
1.143 markus 1179: int id = -1;
1.106 markus 1180:
1181: /* XXX should be pre-session */
1182: ssh_init_forwarding();
1.214 djm 1183: ssh_control_listener();
1.106 markus 1184:
1.143 markus 1185: if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN))
1186: id = ssh_session2_open();
1.255 reyk 1187:
1188: /* Execute a local command */
1189: if (options.local_command != NULL &&
1190: options.permit_local_command)
1191: ssh_local_cmd(options.local_command);
1.106 markus 1192:
1193: /* If requested, let ssh continue in the background. */
1194: if (fork_after_authentication_flag)
1195: if (daemon(1, 1) < 0)
1196: fatal("daemon() failed: %.200s", strerror(errno));
1.31 markus 1197:
1.119 stevesk 1198: return client_loop(tty_flag, tty_flag ?
1199: options.escape_char : SSH_ESCAPECHAR_NONE, id);
1.72 markus 1200: }
1201:
1.126 itojun 1202: static void
1.104 markus 1203: load_public_identity_files(void)
1204: {
1.275 djm 1205: char *filename, *cp, thishost[NI_MAXHOST];
1.167 markus 1206: int i = 0;
1.104 markus 1207: Key *public;
1.275 djm 1208: struct passwd *pw;
1.167 markus 1209: #ifdef SMARTCARD
1210: Key **keys;
1.104 markus 1211:
1.133 markus 1212: if (options.smartcard_device != NULL &&
1.167 markus 1213: options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
1.292 stevesk 1214: (keys = sc_get_keys(options.smartcard_device, NULL)) != NULL) {
1.167 markus 1215: int count = 0;
1216: for (i = 0; keys[i] != NULL; i++) {
1217: count++;
1218: memmove(&options.identity_files[1], &options.identity_files[0],
1219: sizeof(char *) * (SSH_MAX_IDENTITY_FILES - 1));
1220: memmove(&options.identity_keys[1], &options.identity_keys[0],
1221: sizeof(Key *) * (SSH_MAX_IDENTITY_FILES - 1));
1222: options.num_identity_files++;
1223: options.identity_keys[0] = keys[i];
1.194 markus 1224: options.identity_files[0] = sc_get_key_label(keys[i]);
1.167 markus 1225: }
1.168 markus 1226: if (options.num_identity_files > SSH_MAX_IDENTITY_FILES)
1227: options.num_identity_files = SSH_MAX_IDENTITY_FILES;
1.167 markus 1228: i = count;
1229: xfree(keys);
1.127 markus 1230: }
1.136 jakob 1231: #endif /* SMARTCARD */
1.275 djm 1232: if ((pw = getpwuid(original_real_uid)) == NULL)
1233: fatal("load_public_identity_files: getpwuid failed");
1234: if (gethostname(thishost, sizeof(thishost)) == -1)
1235: fatal("load_public_identity_files: gethostname: %s",
1236: strerror(errno));
1.131 millert 1237: for (; i < options.num_identity_files; i++) {
1.275 djm 1238: cp = tilde_expand_filename(options.identity_files[i],
1.131 millert 1239: original_real_uid);
1.275 djm 1240: filename = percent_expand(cp, "d", pw->pw_dir,
1.293 deraadt 1241: "u", pw->pw_name, "l", thishost, "h", host,
1.275 djm 1242: "r", options.user, (char *)NULL);
1243: xfree(cp);
1.131 millert 1244: public = key_load_public(filename, NULL);
1245: debug("identity file %s type %d", filename,
1246: public ? public->type : -1);
1247: xfree(options.identity_files[i]);
1248: options.identity_files[i] = filename;
1249: options.identity_keys[i] = public;
1250: }
1.214 djm 1251: }
1252:
1253: static void
1254: control_client_sighandler(int signo)
1255: {
1256: control_client_terminate = signo;
1257: }
1258:
1259: static void
1260: control_client_sigrelay(int signo)
1261: {
1262: if (control_server_pid > 1)
1263: kill(control_server_pid, signo);
1264: }
1265:
1.220 djm 1266: static int
1267: env_permitted(char *env)
1268: {
1.282 dtucker 1269: int i, ret;
1.220 djm 1270: char name[1024], *cp;
1271:
1.282 dtucker 1272: if ((cp = strchr(env, '=')) == NULL || cp == env)
1.220 djm 1273: return (0);
1.284 stevesk 1274: ret = snprintf(name, sizeof(name), "%.*s", (int)(cp - env), env);
1.282 dtucker 1275: if (ret <= 0 || (size_t)ret >= sizeof(name))
1276: fatal("env_permitted: name '%.100s...' too long", env);
1.220 djm 1277:
1278: for (i = 0; i < options.num_send_env; i++)
1279: if (match_pattern(name, options.send_env[i]))
1280: return (1);
1281:
1282: return (0);
1283: }
1284:
1.214 djm 1285: static void
1286: control_client(const char *path)
1287: {
1288: struct sockaddr_un addr;
1.228 djm 1289: int i, r, fd, sock, exitval, num_env;
1.214 djm 1290: Buffer m;
1.229 djm 1291: char *term;
1.215 djm 1292: extern char **environ;
1.229 djm 1293: u_int flags;
1.242 djm 1294:
1295: if (mux_command == 0)
1296: mux_command = SSHMUX_COMMAND_OPEN;
1297:
1298: switch (options.control_master) {
1299: case SSHCTL_MASTER_AUTO:
1300: case SSHCTL_MASTER_AUTO_ASK:
1301: debug("auto-mux: Trying existing master");
1302: /* FALLTHROUGH */
1303: case SSHCTL_MASTER_NO:
1304: break;
1305: default:
1306: return;
1307: }
1.228 djm 1308:
1.214 djm 1309: memset(&addr, '\0', sizeof(addr));
1310: addr.sun_family = AF_UNIX;
1311: addr.sun_len = offsetof(struct sockaddr_un, sun_path) +
1312: strlen(path) + 1;
1313:
1314: if (strlcpy(addr.sun_path, path,
1315: sizeof(addr.sun_path)) >= sizeof(addr.sun_path))
1316: fatal("ControlPath too long");
1317:
1318: if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) < 0)
1319: fatal("%s socket(): %s", __func__, strerror(errno));
1320:
1.270 deraadt 1321: if (connect(sock, (struct sockaddr *)&addr, addr.sun_len) == -1) {
1.240 djm 1322: if (mux_command != SSHMUX_COMMAND_OPEN) {
1323: fatal("Control socket connect(%.100s): %s", path,
1324: strerror(errno));
1325: }
1.239 djm 1326: if (errno == ENOENT)
1.268 deraadt 1327: debug("Control socket \"%.100s\" does not exist", path);
1.239 djm 1328: else {
1.268 deraadt 1329: error("Control socket connect(%.100s): %s", path,
1.239 djm 1330: strerror(errno));
1331: }
1.268 deraadt 1332: close(sock);
1333: return;
1334: }
1.248 djm 1335:
1.268 deraadt 1336: if (stdin_null_flag) {
1337: if ((fd = open(_PATH_DEVNULL, O_RDONLY)) == -1)
1338: fatal("open(/dev/null): %s", strerror(errno));
1339: if (dup2(fd, STDIN_FILENO) == -1)
1340: fatal("dup2: %s", strerror(errno));
1341: if (fd > STDERR_FILENO)
1342: close(fd);
1343: }
1.248 djm 1344:
1.247 djm 1345: term = getenv("TERM");
1.229 djm 1346:
1347: flags = 0;
1348: if (tty_flag)
1349: flags |= SSHMUX_FLAG_TTY;
1350: if (subsystem_flag)
1351: flags |= SSHMUX_FLAG_SUBSYS;
1.247 djm 1352: if (options.forward_x11)
1353: flags |= SSHMUX_FLAG_X11_FWD;
1354: if (options.forward_agent)
1355: flags |= SSHMUX_FLAG_AGENT_FWD;
1.214 djm 1356:
1357: buffer_init(&m);
1358:
1.229 djm 1359: /* Send our command to server */
1360: buffer_put_int(&m, mux_command);
1361: buffer_put_int(&m, flags);
1.247 djm 1362: if (ssh_msg_send(sock, SSHMUX_VER, &m) == -1)
1.229 djm 1363: fatal("%s: msg_send", __func__);
1364: buffer_clear(&m);
1365:
1366: /* Get authorisation status and PID of controlee */
1.214 djm 1367: if (ssh_msg_recv(sock, &m) == -1)
1368: fatal("%s: msg_recv", __func__);
1.247 djm 1369: if (buffer_get_char(&m) != SSHMUX_VER)
1.214 djm 1370: fatal("%s: wrong version", __func__);
1.216 djm 1371: if (buffer_get_int(&m) != 1)
1372: fatal("Connection to master denied");
1.214 djm 1373: control_server_pid = buffer_get_int(&m);
1374:
1375: buffer_clear(&m);
1376:
1.229 djm 1377: switch (mux_command) {
1378: case SSHMUX_COMMAND_ALIVE_CHECK:
1.234 deraadt 1379: fprintf(stderr, "Master running (pid=%d)\r\n",
1.229 djm 1380: control_server_pid);
1381: exit(0);
1382: case SSHMUX_COMMAND_TERMINATE:
1383: fprintf(stderr, "Exit request sent.\r\n");
1384: exit(0);
1385: case SSHMUX_COMMAND_OPEN:
1386: /* continue below */
1387: break;
1388: default:
1389: fatal("silly mux_command %d", mux_command);
1390: }
1391:
1392: /* SSHMUX_COMMAND_OPEN */
1.247 djm 1393: buffer_put_cstring(&m, term ? term : "");
1.214 djm 1394: buffer_append(&command, "\0", 1);
1395: buffer_put_cstring(&m, buffer_ptr(&command));
1.215 djm 1396:
1.220 djm 1397: if (options.num_send_env == 0 || environ == NULL) {
1398: buffer_put_int(&m, 0);
1.223 deraadt 1399: } else {
1.220 djm 1400: /* Pass environment */
1401: num_env = 0;
1402: for (i = 0; environ[i] != NULL; i++)
1403: if (env_permitted(environ[i]))
1404: num_env++; /* Count */
1.223 deraadt 1405:
1.220 djm 1406: buffer_put_int(&m, num_env);
1407:
1.222 dtucker 1408: for (i = 0; environ[i] != NULL && num_env >= 0; i++)
1409: if (env_permitted(environ[i])) {
1410: num_env--;
1.220 djm 1411: buffer_put_cstring(&m, environ[i]);
1.222 dtucker 1412: }
1.220 djm 1413: }
1.214 djm 1414:
1.247 djm 1415: if (ssh_msg_send(sock, SSHMUX_VER, &m) == -1)
1.214 djm 1416: fatal("%s: msg_send", __func__);
1417:
1418: mm_send_fd(sock, STDIN_FILENO);
1419: mm_send_fd(sock, STDOUT_FILENO);
1420: mm_send_fd(sock, STDERR_FILENO);
1421:
1422: /* Wait for reply, so master has a chance to gather ttymodes */
1423: buffer_clear(&m);
1424: if (ssh_msg_recv(sock, &m) == -1)
1425: fatal("%s: msg_recv", __func__);
1.247 djm 1426: if (buffer_get_char(&m) != SSHMUX_VER)
1.229 djm 1427: fatal("%s: wrong version", __func__);
1.214 djm 1428: buffer_free(&m);
1.218 djm 1429:
1.226 djm 1430: signal(SIGHUP, control_client_sighandler);
1.218 djm 1431: signal(SIGINT, control_client_sighandler);
1432: signal(SIGTERM, control_client_sighandler);
1433: signal(SIGWINCH, control_client_sigrelay);
1.214 djm 1434:
1435: if (tty_flag)
1436: enter_raw_mode();
1437:
1438: /* Stick around until the controlee closes the client_fd */
1439: exitval = 0;
1.296 djm 1440: for (i = 0; !control_client_terminate && i < (int)sizeof(exitval);) {
1441: r = read(sock, (char *)&exitval + i, sizeof(exitval) - i);
1.214 djm 1442: if (r == 0) {
1443: debug2("Received EOF from master");
1444: break;
1445: }
1.299 ! djm 1446: if (r == -1) {
! 1447: if (errno == EINTR)
! 1448: continue;
1.214 djm 1449: fatal("%s: read %s", __func__, strerror(errno));
1.299 ! djm 1450: }
1.296 djm 1451: i += r;
1.214 djm 1452: }
1.296 djm 1453: close(sock);
1454: leave_raw_mode();
1.214 djm 1455:
1.296 djm 1456: if (control_client_terminate) {
1.214 djm 1457: debug2("Exiting on signal %d", control_client_terminate);
1.296 djm 1458: exitval = 255;
1459: } else if (i < (int)sizeof(exitval)) {
1460: debug2("Control master terminated unexpectedly");
1461: exitval = 255;
1462: } else
1463: debug2("Received exit status from master %d", exitval);
1.214 djm 1464:
1465: if (tty_flag && options.log_level != SYSLOG_LEVEL_QUIET)
1.298 djm 1466: fprintf(stderr, "Shared connection to %s closed.\r\n",
1467: host);
1.214 djm 1468:
1469: exit(exitval);
1.1 deraadt 1470: }
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