Annotation of src/usr.bin/ssh/ssh.c, Revision 1.291
1.291 ! stevesk 1: /* $OpenBSD: ssh.c,v 1.290 2006/07/26 13:57:17 stevesk 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:
43: #include "includes.h"
1.259 stevesk 44:
45: #include <sys/resource.h>
1.260 stevesk 46: #include <sys/ioctl.h>
1.262 stevesk 47: #include <sys/types.h>
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:
1.84 markus 68: #include "ssh.h"
69: #include "ssh1.h"
70: #include "ssh2.h"
71: #include "compat.h"
72: #include "cipher.h"
1.1 deraadt 73: #include "xmalloc.h"
74: #include "packet.h"
75: #include "buffer.h"
1.214 djm 76: #include "bufaux.h"
1.123 markus 77: #include "channels.h"
1.49 markus 78: #include "key.h"
1.58 markus 79: #include "authfd.h"
1.49 markus 80: #include "authfile.h"
1.83 markus 81: #include "pathnames.h"
1.214 djm 82: #include "dispatch.h"
1.81 markus 83: #include "clientloop.h"
1.84 markus 84: #include "log.h"
85: #include "readconf.h"
86: #include "sshconnect.h"
87: #include "misc.h"
1.95 markus 88: #include "kex.h"
89: #include "mac.h"
1.213 deraadt 90: #include "sshpty.h"
1.212 djm 91: #include "match.h"
1.214 djm 92: #include "msg.h"
93: #include "monitor_fdpass.h"
1.225 dtucker 94: #include "uidswap.h"
1.278 stevesk 95: #include "version.h"
1.49 markus 96:
1.127 markus 97: #ifdef SMARTCARD
98: #include "scard.h"
1.137 jakob 99: #endif
1.127 markus 100:
1.49 markus 101: extern char *__progname;
1.1 deraadt 102:
1.31 markus 103: /* Flag indicating whether debug mode is on. This can be set on the command line. */
1.1 deraadt 104: int debug_flag = 0;
105:
1.46 markus 106: /* Flag indicating whether a tty should be allocated */
1.1 deraadt 107: int tty_flag = 0;
1.79 markus 108: int no_tty_flag = 0;
109: int force_tty_flag = 0;
1.1 deraadt 110:
1.45 markus 111: /* don't exec a shell */
112: int no_shell_flag = 0;
113:
1.33 markus 114: /*
115: * Flag indicating that nothing should be read from stdin. This can be set
116: * on the command line.
117: */
1.1 deraadt 118: int stdin_null_flag = 0;
119:
1.33 markus 120: /*
121: * Flag indicating that ssh should fork after authentication. This is useful
1.172 deraadt 122: * so that the passphrase can be entered manually, and then ssh goes to the
1.33 markus 123: * background.
124: */
1.1 deraadt 125: int fork_after_authentication_flag = 0;
126:
1.33 markus 127: /*
128: * General data structure for command line options and options configurable
129: * in configuration files. See readconf.h.
130: */
1.1 deraadt 131: Options options;
132:
1.139 markus 133: /* optional user configfile */
134: char *config = NULL;
135:
1.33 markus 136: /*
137: * Name of the host we are connecting to. This is the name given on the
138: * command line, or the HostName specified for the user-supplied name in a
139: * configuration file.
140: */
1.1 deraadt 141: char *host;
142:
1.22 provos 143: /* socket address the host resolves to */
1.37 markus 144: struct sockaddr_storage hostaddr;
1.1 deraadt 145:
1.112 markus 146: /* Private host keys. */
1.173 markus 147: Sensitive sensitive_data;
1.1 deraadt 148:
1.10 dugsong 149: /* Original real UID. */
150: uid_t original_real_uid;
1.177 markus 151: uid_t original_effective_uid;
1.1 deraadt 152:
1.45 markus 153: /* command to be executed */
154: Buffer command;
155:
1.85 djm 156: /* Should we execute a command or invoke a subsystem? */
157: int subsystem_flag = 0;
158:
1.170 markus 159: /* # of replies received for global requests */
160: static int client_global_request_id = 0;
161:
1.186 djm 162: /* pid of proxycommand child process */
163: pid_t proxy_command_pid = 0;
164:
1.214 djm 165: /* fd to control socket */
166: int control_fd = -1;
167:
1.229 djm 168: /* Multiplexing control command */
1.240 djm 169: static u_int mux_command = 0;
1.229 djm 170:
1.214 djm 171: /* Only used in control client mode */
172: volatile sig_atomic_t control_client_terminate = 0;
173: u_int control_server_pid = 0;
174:
1.1 deraadt 175: /* Prints a help message to the user. This function never returns. */
176:
1.126 itojun 177: static void
1.93 itojun 178: usage(void)
1.1 deraadt 179: {
1.208 markus 180: fprintf(stderr,
1.230 jmc 181: "usage: ssh [-1246AaCfgkMNnqsTtVvXxY] [-b bind_address] [-c cipher_spec]\n"
1.251 jmc 182: " [-D [bind_address:]port] [-e escape_char] [-F configfile]\n"
1.233 jmc 183: " [-i identity_file] [-L [bind_address:]port:host:hostport]\n"
1.232 djm 184: " [-l login_name] [-m mac_spec] [-O ctl_cmd] [-o option] [-p port]\n"
1.233 jmc 185: " [-R [bind_address:]port:host:hostport] [-S ctl_path]\n"
1.277 stevesk 186: " [-w local_tun[:remote_tun]] [user@]hostname [command]\n"
1.208 markus 187: );
1.257 dtucker 188: exit(255);
1.1 deraadt 189: }
190:
1.126 itojun 191: static int ssh_session(void);
192: static int ssh_session2(void);
193: static void load_public_identity_files(void);
1.214 djm 194: static void control_client(const char *path);
1.45 markus 195:
1.32 deraadt 196: /*
197: * Main program for the ssh client.
198: */
1.2 provos 199: int
200: main(int ac, char **av)
1.1 deraadt 201: {
1.178 markus 202: int i, opt, exit_status;
1.205 markus 203: char *p, *cp, *line, buf[256];
1.31 markus 204: struct stat st;
1.98 markus 205: struct passwd *pw;
1.45 markus 206: int dummy;
1.144 stevesk 207: extern int optind, optreset;
208: extern char *optarg;
1.244 djm 209: struct servent *sp;
1.232 djm 210: Forward fwd;
1.250 djm 211:
212: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
213: sanitise_stdfd();
1.31 markus 214:
1.33 markus 215: /*
216: * Save the original real uid. It will be needed later (uid-swapping
217: * may clobber the real uid).
218: */
1.31 markus 219: original_real_uid = getuid();
220: original_effective_uid = geteuid();
221:
1.184 stevesk 222: /*
223: * Use uid-swapping to give up root privileges for the duration of
224: * option processing. We will re-instantiate the rights when we are
225: * ready to create the privileged port, and will permanently drop
226: * them when the port has been created (actually, when the connection
227: * has been made, as we may need to create the port several times).
228: */
229: PRIV_END;
230:
1.31 markus 231: /* If we are installed setuid root be careful to not drop core. */
232: if (original_real_uid != original_effective_uid) {
233: struct rlimit rlim;
234: rlim.rlim_cur = rlim.rlim_max = 0;
235: if (setrlimit(RLIMIT_CORE, &rlim) < 0)
236: fatal("setrlimit failed: %.100s", strerror(errno));
1.1 deraadt 237: }
1.107 markus 238: /* Get user data. */
239: pw = getpwuid(original_real_uid);
240: if (!pw) {
1.191 itojun 241: logit("You don't exist, go away!");
1.257 dtucker 242: exit(255);
1.107 markus 243: }
244: /* Take a copy of the returned structure. */
245: pw = pwcopy(pw);
1.31 markus 246:
1.33 markus 247: /*
248: * Set our umask to something reasonable, as some files are created
249: * with the default umask. This will make them world-readable but
250: * writable only by the owner, which is ok for all files for which we
251: * don't set the modes explicitly.
252: */
1.31 markus 253: umask(022);
254:
255: /* Initialize option structure to indicate that no values have been set. */
256: initialize_options(&options);
257:
258: /* Parse command-line arguments. */
259: host = NULL;
260:
1.266 djm 261: again:
1.128 fgsch 262: while ((opt = getopt(ac, av,
1.255 reyk 263: "1246ab:c:e:fgi:kl:m:no:p:qstvxACD:F:I:L:MNO:PR:S:TVw:XY")) != -1) {
1.31 markus 264: switch (opt) {
1.91 jakob 265: case '1':
266: options.protocol = SSH_PROTO_1;
267: break;
1.47 markus 268: case '2':
269: options.protocol = SSH_PROTO_2;
270: break;
1.37 markus 271: case '4':
1.196 djm 272: options.address_family = AF_INET;
1.37 markus 273: break;
274: case '6':
1.196 djm 275: options.address_family = AF_INET6;
1.37 markus 276: break;
1.31 markus 277: case 'n':
278: stdin_null_flag = 1;
279: break;
280: case 'f':
281: fork_after_authentication_flag = 1;
282: stdin_null_flag = 1;
283: break;
284: case 'x':
285: options.forward_x11 = 0;
286: break;
287: case 'X':
288: options.forward_x11 = 1;
289: break;
1.202 markus 290: case 'Y':
291: options.forward_x11 = 1;
292: options.forward_x11_trusted = 1;
293: break;
1.31 markus 294: case 'g':
295: options.gateway_ports = 1;
296: break;
1.229 djm 297: case 'O':
298: if (strcmp(optarg, "check") == 0)
299: mux_command = SSHMUX_COMMAND_ALIVE_CHECK;
300: else if (strcmp(optarg, "exit") == 0)
301: mux_command = SSHMUX_COMMAND_TERMINATE;
302: else
303: fatal("Invalid multiplex command.");
304: break;
1.183 stevesk 305: case 'P': /* deprecated */
1.31 markus 306: options.use_privileged_port = 0;
307: break;
308: case 'a':
309: options.forward_agent = 0;
1.53 markus 310: break;
311: case 'A':
312: options.forward_agent = 1;
1.31 markus 313: break;
314: case 'k':
1.204 dtucker 315: options.gss_deleg_creds = 0;
1.31 markus 316: break;
317: case 'i':
318: if (stat(optarg, &st) < 0) {
1.128 fgsch 319: fprintf(stderr, "Warning: Identity file %s "
1.231 otto 320: "not accessible: %s.\n", optarg,
321: strerror(errno));
1.31 markus 322: break;
323: }
1.128 fgsch 324: if (options.num_identity_files >=
325: SSH_MAX_IDENTITY_FILES)
326: fatal("Too many identity files specified "
327: "(max %d)", SSH_MAX_IDENTITY_FILES);
328: options.identity_files[options.num_identity_files++] =
329: xstrdup(optarg);
1.31 markus 330: break;
1.127 markus 331: case 'I':
332: #ifdef SMARTCARD
1.133 markus 333: options.smartcard_device = xstrdup(optarg);
1.137 jakob 334: #else
1.127 markus 335: fprintf(stderr, "no support for smartcards.\n");
1.137 jakob 336: #endif
1.127 markus 337: break;
1.31 markus 338: case 't':
1.79 markus 339: if (tty_flag)
340: force_tty_flag = 1;
1.31 markus 341: tty_flag = 1;
342: break;
343: case 'v':
1.197 markus 344: if (debug_flag == 0) {
1.66 markus 345: debug_flag = 1;
346: options.log_level = SYSLOG_LEVEL_DEBUG1;
1.197 markus 347: } else {
348: if (options.log_level < SYSLOG_LEVEL_DEBUG3)
349: options.log_level++;
1.66 markus 350: break;
1.197 markus 351: }
1.227 deraadt 352: /* FALLTHROUGH */
1.31 markus 353: case 'V':
1.209 markus 354: fprintf(stderr, "%s, %s\n",
355: SSH_VERSION, SSLeay_version(SSLEAY_VERSION));
1.31 markus 356: if (opt == 'V')
357: exit(0);
358: break;
1.255 reyk 359: case 'w':
1.256 reyk 360: if (options.tun_open == -1)
361: options.tun_open = SSH_TUNMODE_DEFAULT;
1.255 reyk 362: options.tun_local = a2tun(optarg, &options.tun_remote);
1.256 reyk 363: if (options.tun_local == SSH_TUNID_ERR) {
1.255 reyk 364: fprintf(stderr, "Bad tun device '%s'\n", optarg);
1.257 dtucker 365: exit(255);
1.255 reyk 366: }
367: break;
1.31 markus 368: case 'q':
369: options.log_level = SYSLOG_LEVEL_QUIET;
370: break;
371: case 'e':
372: if (optarg[0] == '^' && optarg[2] == 0 &&
1.128 fgsch 373: (u_char) optarg[1] >= 64 &&
374: (u_char) optarg[1] < 128)
1.78 markus 375: options.escape_char = (u_char) optarg[1] & 31;
1.31 markus 376: else if (strlen(optarg) == 1)
1.78 markus 377: options.escape_char = (u_char) optarg[0];
1.31 markus 378: else if (strcmp(optarg, "none") == 0)
1.119 stevesk 379: options.escape_char = SSH_ESCAPECHAR_NONE;
1.31 markus 380: else {
1.128 fgsch 381: fprintf(stderr, "Bad escape character '%s'.\n",
382: optarg);
1.257 dtucker 383: exit(255);
1.31 markus 384: }
385: break;
386: case 'c':
1.49 markus 387: if (ciphers_valid(optarg)) {
388: /* SSH2 only */
389: options.ciphers = xstrdup(optarg);
1.224 markus 390: options.cipher = SSH_CIPHER_INVALID;
1.49 markus 391: } else {
392: /* SSH1 only */
1.74 markus 393: options.cipher = cipher_number(optarg);
394: if (options.cipher == -1) {
1.128 fgsch 395: fprintf(stderr,
396: "Unknown cipher type '%s'\n",
397: optarg);
1.257 dtucker 398: exit(255);
1.49 markus 399: }
1.128 fgsch 400: if (options.cipher == SSH_CIPHER_3DES)
1.74 markus 401: options.ciphers = "3des-cbc";
1.128 fgsch 402: else if (options.cipher == SSH_CIPHER_BLOWFISH)
1.74 markus 403: options.ciphers = "blowfish-cbc";
1.128 fgsch 404: else
1.74 markus 405: options.ciphers = (char *)-1;
1.95 markus 406: }
407: break;
408: case 'm':
409: if (mac_valid(optarg))
410: options.macs = xstrdup(optarg);
411: else {
1.128 fgsch 412: fprintf(stderr, "Unknown mac type '%s'\n",
413: optarg);
1.257 dtucker 414: exit(255);
1.31 markus 415: }
416: break;
1.214 djm 417: case 'M':
1.242 djm 418: if (options.control_master == SSHCTL_MASTER_YES)
419: options.control_master = SSHCTL_MASTER_ASK;
420: else
421: options.control_master = SSHCTL_MASTER_YES;
1.214 djm 422: break;
1.31 markus 423: case 'p':
1.113 stevesk 424: options.port = a2port(optarg);
425: if (options.port == 0) {
1.109 markus 426: fprintf(stderr, "Bad port '%s'\n", optarg);
1.257 dtucker 427: exit(255);
1.109 markus 428: }
1.31 markus 429: break;
430: case 'l':
431: options.user = optarg;
432: break;
1.141 stevesk 433:
434: case 'L':
1.232 djm 435: if (parse_forward(&fwd, optarg))
436: add_local_forward(&options, &fwd);
437: else {
1.128 fgsch 438: fprintf(stderr,
1.232 djm 439: "Bad local forwarding specification '%s'\n",
1.128 fgsch 440: optarg);
1.257 dtucker 441: exit(255);
1.31 markus 442: }
1.232 djm 443: break;
444:
445: case 'R':
446: if (parse_forward(&fwd, optarg)) {
447: add_remote_forward(&options, &fwd);
448: } else {
1.128 fgsch 449: fprintf(stderr,
1.232 djm 450: "Bad remote forwarding specification "
451: "'%s'\n", optarg);
1.257 dtucker 452: exit(255);
1.31 markus 453: }
454: break;
1.108 markus 455:
456: case 'D':
1.232 djm 457: cp = p = xstrdup(optarg);
458: memset(&fwd, '\0', sizeof(fwd));
459: fwd.connect_host = "socks";
460: if ((fwd.listen_host = hpdelim(&cp)) == NULL) {
461: fprintf(stderr, "Bad dynamic forwarding "
462: "specification '%.100s'\n", optarg);
1.257 dtucker 463: exit(255);
1.232 djm 464: }
465: if (cp != NULL) {
466: fwd.listen_port = a2port(cp);
467: fwd.listen_host = cleanhostname(fwd.listen_host);
468: } else {
469: fwd.listen_port = a2port(fwd.listen_host);
1.249 djm 470: fwd.listen_host = NULL;
1.232 djm 471: }
472:
473: if (fwd.listen_port == 0) {
1.128 fgsch 474: fprintf(stderr, "Bad dynamic port '%s'\n",
475: optarg);
1.257 dtucker 476: exit(255);
1.109 markus 477: }
1.232 djm 478: add_local_forward(&options, &fwd);
479: xfree(p);
1.108 markus 480: break;
481:
1.31 markus 482: case 'C':
483: options.compression = 1;
484: break;
1.45 markus 485: case 'N':
486: no_shell_flag = 1;
487: no_tty_flag = 1;
488: break;
489: case 'T':
490: no_tty_flag = 1;
491: break;
1.31 markus 492: case 'o':
493: dummy = 1;
1.205 markus 494: line = xstrdup(optarg);
1.128 fgsch 495: if (process_config_line(&options, host ? host : "",
1.205 markus 496: line, "command-line", 0, &dummy) != 0)
1.257 dtucker 497: exit(255);
1.205 markus 498: xfree(line);
1.31 markus 499: break;
1.85 djm 500: case 's':
501: subsystem_flag = 1;
1.117 markus 502: break;
1.214 djm 503: case 'S':
504: if (options.control_path != NULL)
505: free(options.control_path);
506: options.control_path = xstrdup(optarg);
507: break;
1.117 markus 508: case 'b':
509: options.bind_address = optarg;
1.85 djm 510: break;
1.139 markus 511: case 'F':
512: config = optarg;
513: break;
1.31 markus 514: default:
515: usage();
1.1 deraadt 516: }
1.31 markus 517: }
518:
1.128 fgsch 519: ac -= optind;
520: av += optind;
521:
522: if (ac > 0 && !host && **av != '-') {
1.188 markus 523: if (strrchr(*av, '@')) {
1.128 fgsch 524: p = xstrdup(*av);
1.188 markus 525: cp = strrchr(p, '@');
1.128 fgsch 526: if (cp == NULL || cp == p)
527: usage();
528: options.user = p;
529: *cp = '\0';
530: host = ++cp;
531: } else
532: host = *av;
1.189 millert 533: if (ac > 1) {
534: optind = optreset = 1;
1.128 fgsch 535: goto again;
536: }
1.189 millert 537: ac--, av++;
1.128 fgsch 538: }
539:
1.31 markus 540: /* Check that we got a host name. */
541: if (!host)
542: usage();
543:
1.54 markus 544: SSLeay_add_all_algorithms();
1.72 markus 545: ERR_load_crypto_strings();
1.31 markus 546:
547: /* Initialize the command to execute on remote host. */
548: buffer_init(&command);
1.1 deraadt 549:
1.33 markus 550: /*
551: * Save the command to execute on the remote host in a buffer. There
552: * is no limit on the length of the command, except by the maximum
553: * packet size. Also sets the tty flag if there is no command.
554: */
1.128 fgsch 555: if (!ac) {
1.31 markus 556: /* No command specified - execute shell on a tty. */
557: tty_flag = 1;
1.85 djm 558: if (subsystem_flag) {
1.128 fgsch 559: fprintf(stderr,
560: "You must specify a subsystem to invoke.\n");
1.85 djm 561: usage();
562: }
1.31 markus 563: } else {
1.128 fgsch 564: /* A command has been specified. Store it into the buffer. */
565: for (i = 0; i < ac; i++) {
566: if (i)
1.31 markus 567: buffer_append(&command, " ", 1);
568: buffer_append(&command, av[i], strlen(av[i]));
569: }
570: }
571:
572: /* Cannot fork to background if no command. */
1.63 markus 573: if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag)
1.31 markus 574: fatal("Cannot fork into background without a command to execute.");
575:
576: /* Allocate a tty by default if no command specified. */
577: if (buffer_len(&command) == 0)
578: tty_flag = 1;
579:
1.180 deraadt 580: /* Force no tty */
1.75 markus 581: if (no_tty_flag)
582: tty_flag = 0;
1.31 markus 583: /* Do not allocate a tty if stdin is not a tty. */
1.236 djm 584: if ((!isatty(fileno(stdin)) || stdin_null_flag) && !force_tty_flag) {
1.31 markus 585: if (tty_flag)
1.191 itojun 586: logit("Pseudo-terminal will not be allocated because stdin is not a terminal.");
1.31 markus 587: tty_flag = 0;
588: }
1.45 markus 589:
1.101 markus 590: /*
591: * Initialize "log" output. Since we are the client all output
592: * actually goes to stderr.
593: */
1.111 markus 594: log_init(av[0], options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level,
595: SYSLOG_FACILITY_USER, 1);
1.31 markus 596:
1.139 markus 597: /*
598: * Read per-user configuration file. Ignore the system wide config
599: * file if the user specifies a config file on the command line.
600: */
601: if (config != NULL) {
1.211 djm 602: if (!read_config_file(config, host, &options, 0))
1.142 stevesk 603: fatal("Can't open user config file %.100s: "
604: "%.100s", config, strerror(errno));
1.139 markus 605: } else {
606: snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir,
607: _PATH_SSH_USER_CONFFILE);
1.210 djm 608: (void)read_config_file(buf, host, &options, 1);
1.139 markus 609:
1.145 markus 610: /* Read systemwide configuration file after use config. */
1.223 deraadt 611: (void)read_config_file(_PATH_HOST_CONFIG_FILE, host,
1.210 djm 612: &options, 0);
1.139 markus 613: }
1.31 markus 614:
615: /* Fill configuration defaults. */
616: fill_default_options(&options);
617:
1.196 djm 618: channel_set_af(options.address_family);
619:
1.31 markus 620: /* reinit */
1.101 markus 621: log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 1);
1.31 markus 622:
623: if (options.user == NULL)
624: options.user = xstrdup(pw->pw_name);
625:
626: if (options.hostname != NULL)
627: host = options.hostname;
1.195 markus 628:
629: /* force lowercase for hostkey matching */
630: if (options.host_key_alias != NULL) {
631: for (p = options.host_key_alias; *p; p++)
632: if (isupper(*p))
1.271 deraadt 633: *p = (char)tolower(*p);
1.195 markus 634: }
1.190 markus 635:
1.246 djm 636: /* Get default port if port has not been set. */
637: if (options.port == 0) {
638: sp = getservbyname(SSH_SERVICE_NAME, "tcp");
639: options.port = sp ? ntohs(sp->s_port) : SSH_DEFAULT_PORT;
640: }
641:
1.190 markus 642: if (options.proxy_command != NULL &&
643: strcmp(options.proxy_command, "none") == 0)
644: options.proxy_command = NULL;
1.245 djm 645: if (options.control_path != NULL &&
646: strcmp(options.control_path, "none") == 0)
647: options.control_path = NULL;
1.31 markus 648:
1.214 djm 649: if (options.control_path != NULL) {
1.275 djm 650: char thishost[NI_MAXHOST];
1.261 djm 651:
1.275 djm 652: if (gethostname(thishost, sizeof(thishost)) == -1)
1.261 djm 653: fatal("gethostname: %s", strerror(errno));
1.241 djm 654: snprintf(buf, sizeof(buf), "%d", options.port);
655: cp = tilde_expand_filename(options.control_path,
656: original_real_uid);
657: options.control_path = percent_expand(cp, "p", buf, "h", host,
1.275 djm 658: "r", options.user, "l", thishost, (char *)NULL);
1.241 djm 659: xfree(cp);
1.214 djm 660: }
1.240 djm 661: if (mux_command != 0 && options.control_path == NULL)
662: fatal("No ControlPath specified for \"-O\" command");
1.242 djm 663: if (options.control_path != NULL)
1.237 jakob 664: control_client(options.control_path);
1.214 djm 665:
1.77 markus 666: /* Open a connection to the remote host. */
1.203 djm 667: if (ssh_connect(host, &hostaddr, options.port,
1.196 djm 668: options.address_family, options.connection_attempts,
1.177 markus 669: original_effective_uid == 0 && options.use_privileged_port,
1.179 markus 670: options.proxy_command) != 0)
1.257 dtucker 671: exit(255);
1.31 markus 672:
1.33 markus 673: /*
674: * If we successfully made the connection, load the host private key
675: * in case we will need it later for combined rsa-rhosts
676: * authentication. This must be done before releasing extra
677: * privileges, because the file is only readable by root.
1.174 markus 678: * If we cannot access the private keys, load the public keys
679: * instead and try to execute the ssh-keysign helper instead.
1.33 markus 680: */
1.112 markus 681: sensitive_data.nkeys = 0;
682: sensitive_data.keys = NULL;
1.173 markus 683: sensitive_data.external_keysign = 0;
1.178 markus 684: if (options.rhosts_rsa_authentication ||
685: options.hostbased_authentication) {
1.112 markus 686: sensitive_data.nkeys = 3;
1.274 deraadt 687: sensitive_data.keys = xcalloc(sensitive_data.nkeys,
1.180 deraadt 688: sizeof(Key));
1.177 markus 689:
690: PRIV_START;
1.112 markus 691: sensitive_data.keys[0] = key_load_private_type(KEY_RSA1,
1.276 dtucker 692: _PATH_HOST_KEY_FILE, "", NULL, NULL);
1.112 markus 693: sensitive_data.keys[1] = key_load_private_type(KEY_DSA,
1.276 dtucker 694: _PATH_HOST_DSA_KEY_FILE, "", NULL, NULL);
1.112 markus 695: sensitive_data.keys[2] = key_load_private_type(KEY_RSA,
1.276 dtucker 696: _PATH_HOST_RSA_KEY_FILE, "", NULL, NULL);
1.177 markus 697: PRIV_END;
1.173 markus 698:
1.181 markus 699: if (options.hostbased_authentication == 1 &&
700: sensitive_data.keys[0] == NULL &&
1.173 markus 701: sensitive_data.keys[1] == NULL &&
702: sensitive_data.keys[2] == NULL) {
703: sensitive_data.keys[1] = key_load_public(
704: _PATH_HOST_DSA_KEY_FILE, NULL);
705: sensitive_data.keys[2] = key_load_public(
706: _PATH_HOST_RSA_KEY_FILE, NULL);
707: sensitive_data.external_keysign = 1;
708: }
1.31 markus 709: }
1.33 markus 710: /*
711: * Get rid of any extra privileges that we may have. We will no
712: * longer need them. Also, extra privileges could make it very hard
713: * to read identity files and other non-world-readable files from the
714: * user's home directory if it happens to be on a NFS volume where
715: * root is mapped to nobody.
716: */
1.225 dtucker 717: if (original_effective_uid == 0) {
718: PRIV_START;
719: permanently_set_uid(pw);
720: }
1.31 markus 721:
1.33 markus 722: /*
723: * Now that we are back to our own permissions, create ~/.ssh
1.254 djm 724: * directory if it doesn't already exist.
1.33 markus 725: */
1.138 jakob 726: snprintf(buf, sizeof buf, "%.100s%s%.100s", pw->pw_dir, strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR);
1.31 markus 727: if (stat(buf, &st) < 0)
1.57 djm 728: if (mkdir(buf, 0700) < 0)
1.31 markus 729: error("Could not create directory '%.200s'.", buf);
730:
1.104 markus 731: /* load options.identity_files */
732: load_public_identity_files();
733:
734: /* Expand ~ in known host file names. */
735: /* XXX mem-leaks: */
1.72 markus 736: options.system_hostfile =
737: tilde_expand_filename(options.system_hostfile, original_real_uid);
738: options.user_hostfile =
739: tilde_expand_filename(options.user_hostfile, original_real_uid);
740: options.system_hostfile2 =
741: tilde_expand_filename(options.system_hostfile2, original_real_uid);
742: options.user_hostfile2 =
743: tilde_expand_filename(options.user_hostfile2, original_real_uid);
1.149 markus 744:
745: signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
1.31 markus 746:
747: /* Log into the remote system. This never returns if the login fails. */
1.173 markus 748: ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr, pw);
1.31 markus 749:
1.112 markus 750: /* We no longer need the private host keys. Clear them now. */
751: if (sensitive_data.nkeys != 0) {
752: for (i = 0; i < sensitive_data.nkeys; i++) {
753: if (sensitive_data.keys[i] != NULL) {
754: /* Destroys contents safely */
755: debug3("clear hostkey %d", i);
756: key_free(sensitive_data.keys[i]);
757: sensitive_data.keys[i] = NULL;
758: }
759: }
760: xfree(sensitive_data.keys);
1.134 markus 761: }
762: for (i = 0; i < options.num_identity_files; i++) {
763: if (options.identity_files[i]) {
764: xfree(options.identity_files[i]);
765: options.identity_files[i] = NULL;
766: }
767: if (options.identity_keys[i]) {
768: key_free(options.identity_keys[i]);
769: options.identity_keys[i] = NULL;
770: }
1.112 markus 771: }
1.31 markus 772:
1.45 markus 773: exit_status = compat20 ? ssh_session2() : ssh_session();
774: packet_close();
1.186 djm 775:
1.214 djm 776: if (options.control_path != NULL && control_fd != -1)
777: unlink(options.control_path);
778:
1.186 djm 779: /*
1.203 djm 780: * Send SIGHUP to proxy command if used. We don't wait() in
1.186 djm 781: * case it hangs and instead rely on init to reap the child
782: */
783: if (proxy_command_pid > 1)
784: kill(proxy_command_pid, SIGHUP);
785:
1.45 markus 786: return exit_status;
787: }
788:
1.126 itojun 789: static void
1.70 markus 790: ssh_init_forwarding(void)
791: {
1.86 markus 792: int success = 0;
1.70 markus 793: int i;
1.86 markus 794:
1.70 markus 795: /* Initiate local TCP/IP port forwardings. */
796: for (i = 0; i < options.num_local_forwards; i++) {
1.232 djm 797: debug("Local connections to %.200s:%d forwarded to remote "
798: "address %.200s:%d",
1.234 deraadt 799: (options.local_forwards[i].listen_host == NULL) ?
800: (options.gateway_ports ? "*" : "LOCALHOST") :
1.232 djm 801: options.local_forwards[i].listen_host,
802: options.local_forwards[i].listen_port,
803: options.local_forwards[i].connect_host,
804: options.local_forwards[i].connect_port);
1.158 markus 805: success += channel_setup_local_fwd_listener(
1.232 djm 806: options.local_forwards[i].listen_host,
807: options.local_forwards[i].listen_port,
808: options.local_forwards[i].connect_host,
809: options.local_forwards[i].connect_port,
1.70 markus 810: options.gateway_ports);
811: }
1.283 markus 812: if (i > 0 && success != i && options.exit_on_forward_failure)
813: fatal("Could not request local forwarding.");
1.86 markus 814: if (i > 0 && success == 0)
815: error("Could not request local forwarding.");
1.70 markus 816:
817: /* Initiate remote TCP/IP port forwardings. */
818: for (i = 0; i < options.num_remote_forwards; i++) {
1.232 djm 819: debug("Remote connections from %.200s:%d forwarded to "
820: "local address %.200s:%d",
1.248 djm 821: (options.remote_forwards[i].listen_host == NULL) ?
1.253 djm 822: "LOCALHOST" : options.remote_forwards[i].listen_host,
1.232 djm 823: options.remote_forwards[i].listen_port,
824: options.remote_forwards[i].connect_host,
825: options.remote_forwards[i].connect_port);
1.283 markus 826: if (channel_request_remote_forwarding(
1.232 djm 827: options.remote_forwards[i].listen_host,
828: options.remote_forwards[i].listen_port,
829: options.remote_forwards[i].connect_host,
1.283 markus 830: options.remote_forwards[i].connect_port) < 0) {
831: if (options.exit_on_forward_failure)
832: fatal("Could not request remote forwarding.");
833: else
834: logit("Warning: Could not request remote "
835: "forwarding.");
836: }
1.70 markus 837: }
838: }
839:
1.126 itojun 840: static void
1.70 markus 841: check_agent_present(void)
842: {
843: if (options.forward_agent) {
1.254 djm 844: /* Clear agent forwarding if we don't have an agent. */
1.185 stevesk 845: if (!ssh_agent_present())
1.70 markus 846: options.forward_agent = 0;
847: }
848: }
849:
1.126 itojun 850: static int
1.45 markus 851: ssh_session(void)
852: {
853: int type;
854: int interactive = 0;
855: int have_tty = 0;
856: struct winsize ws;
857: char *cp;
1.243 djm 858: const char *display;
1.45 markus 859:
1.31 markus 860: /* Enable compression if requested. */
861: if (options.compression) {
862: debug("Requesting compression at level %d.", options.compression_level);
863:
864: if (options.compression_level < 1 || options.compression_level > 9)
865: fatal("Compression level must be from 1 (fast) to 9 (slow, best).");
866:
867: /* Send the request. */
868: packet_start(SSH_CMSG_REQUEST_COMPRESSION);
869: packet_put_int(options.compression_level);
870: packet_send();
871: packet_write_wait();
1.156 markus 872: type = packet_read();
1.31 markus 873: if (type == SSH_SMSG_SUCCESS)
874: packet_start_compression(options.compression_level);
875: else if (type == SSH_SMSG_FAILURE)
1.191 itojun 876: logit("Warning: Remote host refused compression.");
1.31 markus 877: else
878: packet_disconnect("Protocol error waiting for compression response.");
879: }
880: /* Allocate a pseudo tty if appropriate. */
881: if (tty_flag) {
882: debug("Requesting pty.");
883:
884: /* Start the packet. */
885: packet_start(SSH_CMSG_REQUEST_PTY);
886:
887: /* Store TERM in the packet. There is no limit on the
888: length of the string. */
889: cp = getenv("TERM");
890: if (!cp)
891: cp = "";
1.124 markus 892: packet_put_cstring(cp);
1.31 markus 893:
894: /* Store window size in the packet. */
895: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
896: memset(&ws, 0, sizeof(ws));
1.269 deraadt 897: packet_put_int((u_int)ws.ws_row);
898: packet_put_int((u_int)ws.ws_col);
899: packet_put_int((u_int)ws.ws_xpixel);
900: packet_put_int((u_int)ws.ws_ypixel);
1.31 markus 901:
902: /* Store tty modes in the packet. */
1.115 stevesk 903: tty_make_modes(fileno(stdin), NULL);
1.31 markus 904:
905: /* Send the packet, and wait for it to leave. */
906: packet_send();
907: packet_write_wait();
908:
909: /* Read response from the server. */
1.156 markus 910: type = packet_read();
1.43 markus 911: if (type == SSH_SMSG_SUCCESS) {
1.31 markus 912: interactive = 1;
1.45 markus 913: have_tty = 1;
1.43 markus 914: } else if (type == SSH_SMSG_FAILURE)
1.191 itojun 915: logit("Warning: Remote host failed or refused to allocate a pseudo tty.");
1.31 markus 916: else
917: packet_disconnect("Protocol error waiting for pty request response.");
918: }
919: /* Request X11 forwarding if enabled and DISPLAY is set. */
1.243 djm 920: display = getenv("DISPLAY");
921: if (options.forward_x11 && display != NULL) {
1.150 stevesk 922: char *proto, *data;
1.50 markus 923: /* Get reasonable local authentication information. */
1.243 djm 924: client_x11_get_proto(display, options.xauth_location,
925: options.forward_x11_trusted, &proto, &data);
1.50 markus 926: /* Request forwarding with authentication spoofing. */
1.31 markus 927: debug("Requesting X11 forwarding with authentication spoofing.");
1.243 djm 928: x11_request_forwarding_with_spoofing(0, display, proto, data);
1.31 markus 929:
930: /* Read response from the server. */
1.156 markus 931: type = packet_read();
1.31 markus 932: if (type == SSH_SMSG_SUCCESS) {
933: interactive = 1;
1.50 markus 934: } else if (type == SSH_SMSG_FAILURE) {
1.191 itojun 935: logit("Warning: Remote host denied X11 forwarding.");
1.50 markus 936: } else {
1.31 markus 937: packet_disconnect("Protocol error waiting for X11 forwarding");
1.50 markus 938: }
1.31 markus 939: }
940: /* Tell the packet module whether this is an interactive session. */
1.80 markus 941: packet_set_interactive(interactive);
1.31 markus 942:
943: /* Request authentication agent forwarding if appropriate. */
1.70 markus 944: check_agent_present();
945:
1.31 markus 946: if (options.forward_agent) {
947: debug("Requesting authentication agent forwarding.");
948: auth_request_forwarding();
949:
950: /* Read response from the server. */
1.156 markus 951: type = packet_read();
1.155 markus 952: packet_check_eom();
1.31 markus 953: if (type != SSH_SMSG_SUCCESS)
1.191 itojun 954: logit("Warning: Remote host denied authentication agent forwarding.");
1.31 markus 955: }
956:
1.70 markus 957: /* Initiate port forwardings. */
958: ssh_init_forwarding();
1.34 markus 959:
960: /* If requested, let ssh continue in the background. */
1.48 markus 961: if (fork_after_authentication_flag)
1.34 markus 962: if (daemon(1, 1) < 0)
963: fatal("daemon() failed: %.200s", strerror(errno));
1.31 markus 964:
1.33 markus 965: /*
966: * If a command was specified on the command line, execute the
967: * command now. Otherwise request the server to start a shell.
968: */
1.31 markus 969: if (buffer_len(&command) > 0) {
970: int len = buffer_len(&command);
971: if (len > 900)
972: len = 900;
1.152 stevesk 973: debug("Sending command: %.*s", len, (u_char *)buffer_ptr(&command));
1.31 markus 974: packet_start(SSH_CMSG_EXEC_CMD);
975: packet_put_string(buffer_ptr(&command), buffer_len(&command));
976: packet_send();
977: packet_write_wait();
978: } else {
979: debug("Requesting shell.");
980: packet_start(SSH_CMSG_EXEC_SHELL);
981: packet_send();
982: packet_write_wait();
983: }
984:
985: /* Enter the interactive session. */
1.119 stevesk 986: return client_loop(have_tty, tty_flag ?
987: options.escape_char : SSH_ESCAPECHAR_NONE, 0);
1.45 markus 988: }
989:
1.126 itojun 990: static void
1.214 djm 991: ssh_subsystem_reply(int type, u_int32_t seq, void *ctxt)
1.89 markus 992: {
993: int id, len;
994:
995: id = packet_get_int();
996: len = buffer_len(&command);
1.100 markus 997: if (len > 900)
998: len = 900;
1.155 markus 999: packet_check_eom();
1.89 markus 1000: if (type == SSH2_MSG_CHANNEL_FAILURE)
1001: fatal("Request for subsystem '%.*s' failed on channel %d",
1.152 stevesk 1002: len, (u_char *)buffer_ptr(&command), id);
1.170 markus 1003: }
1004:
1005: void
1.206 markus 1006: client_global_request_reply_fwd(int type, u_int32_t seq, void *ctxt)
1.170 markus 1007: {
1008: int i;
1009:
1010: i = client_global_request_id++;
1.206 markus 1011: if (i >= options.num_remote_forwards)
1.170 markus 1012: return;
1013: debug("remote forward %s for: listen %d, connect %s:%d",
1014: type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
1.232 djm 1015: options.remote_forwards[i].listen_port,
1016: options.remote_forwards[i].connect_host,
1017: options.remote_forwards[i].connect_port);
1.283 markus 1018: if (type == SSH2_MSG_REQUEST_FAILURE) {
1019: if (options.exit_on_forward_failure)
1020: fatal("Error: remote port forwarding failed for "
1021: "listen port %d",
1022: options.remote_forwards[i].listen_port);
1023: else
1024: logit("Warning: remote port forwarding failed for "
1025: "listen port %d",
1026: options.remote_forwards[i].listen_port);
1027: }
1.89 markus 1028: }
1029:
1.126 itojun 1030: static void
1.214 djm 1031: ssh_control_listener(void)
1.45 markus 1032: {
1.214 djm 1033: struct sockaddr_un addr;
1034: mode_t old_umask;
1.223 deraadt 1035:
1.242 djm 1036: if (options.control_path == NULL ||
1037: options.control_master == SSHCTL_MASTER_NO)
1.214 djm 1038: return;
1039:
1.242 djm 1040: debug("setting up multiplex master socket");
1041:
1.214 djm 1042: memset(&addr, '\0', sizeof(addr));
1043: addr.sun_family = AF_UNIX;
1044: addr.sun_len = offsetof(struct sockaddr_un, sun_path) +
1045: strlen(options.control_path) + 1;
1046:
1047: if (strlcpy(addr.sun_path, options.control_path,
1048: sizeof(addr.sun_path)) >= sizeof(addr.sun_path))
1049: fatal("ControlPath too long");
1050:
1051: if ((control_fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0)
1.252 stevesk 1052: fatal("%s socket(): %s", __func__, strerror(errno));
1.214 djm 1053:
1054: old_umask = umask(0177);
1.270 deraadt 1055: if (bind(control_fd, (struct sockaddr *)&addr, addr.sun_len) == -1) {
1.214 djm 1056: control_fd = -1;
1.238 djm 1057: if (errno == EINVAL || errno == EADDRINUSE)
1.214 djm 1058: fatal("ControlSocket %s already exists",
1059: options.control_path);
1060: else
1.252 stevesk 1061: fatal("%s bind(): %s", __func__, strerror(errno));
1.214 djm 1062: }
1063: umask(old_umask);
1.80 markus 1064:
1.214 djm 1065: if (listen(control_fd, 64) == -1)
1.252 stevesk 1066: fatal("%s listen(): %s", __func__, strerror(errno));
1.31 markus 1067:
1.214 djm 1068: set_nonblock(control_fd);
1069: }
1.45 markus 1070:
1.214 djm 1071: /* request pty/x11/agent/tcpfwd/shell for channel */
1072: static void
1073: ssh_session2_setup(int id, void *arg)
1074: {
1.215 djm 1075: extern char **environ;
1.243 djm 1076: const char *display;
1077: int interactive = tty_flag;
1.215 djm 1078:
1.248 djm 1079: display = getenv("DISPLAY");
1.243 djm 1080: if (options.forward_x11 && display != NULL) {
1.150 stevesk 1081: char *proto, *data;
1.50 markus 1082: /* Get reasonable local authentication information. */
1.243 djm 1083: client_x11_get_proto(display, options.xauth_location,
1084: options.forward_x11_trusted, &proto, &data);
1.50 markus 1085: /* Request forwarding with authentication spoofing. */
1086: debug("Requesting X11 forwarding with authentication spoofing.");
1.243 djm 1087: x11_request_forwarding_with_spoofing(id, display, proto, data);
1.80 markus 1088: interactive = 1;
1.50 markus 1089: /* XXX wait for reply */
1090: }
1091:
1.70 markus 1092: check_agent_present();
1093: if (options.forward_agent) {
1094: debug("Requesting authentication agent forwarding.");
1095: channel_request_start(id, "auth-agent-req@openssh.com", 0);
1096: packet_send();
1.212 djm 1097: }
1098:
1.256 reyk 1099: if (options.tun_open != SSH_TUNMODE_NO) {
1.255 reyk 1100: Channel *c;
1101: int fd;
1102:
1103: debug("Requesting tun.");
1.256 reyk 1104: if ((fd = tun_open(options.tun_local,
1105: options.tun_open)) >= 0) {
1.255 reyk 1106: c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1,
1107: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT,
1108: 0, "tun", 1);
1109: c->datagram = 1;
1110: packet_start(SSH2_MSG_CHANNEL_OPEN);
1111: packet_put_cstring("tun@openssh.com");
1112: packet_put_int(c->self);
1113: packet_put_int(c->local_window_max);
1114: packet_put_int(c->local_maxpacket);
1.256 reyk 1115: packet_put_int(options.tun_open);
1.255 reyk 1116: packet_put_int(options.tun_remote);
1117: packet_send();
1118: }
1119: }
1120:
1.214 djm 1121: client_session2_setup(id, tty_flag, subsystem_flag, getenv("TERM"),
1.215 djm 1122: NULL, fileno(stdin), &command, environ, &ssh_subsystem_reply);
1.90 markus 1123:
1.80 markus 1124: packet_set_interactive(interactive);
1.45 markus 1125: }
1126:
1.143 markus 1127: /* open new channel for a session */
1.126 itojun 1128: static int
1.143 markus 1129: ssh_session2_open(void)
1.45 markus 1130: {
1.118 markus 1131: Channel *c;
1132: int window, packetmax, in, out, err;
1.60 markus 1133:
1.62 markus 1134: if (stdin_null_flag) {
1.93 itojun 1135: in = open(_PATH_DEVNULL, O_RDONLY);
1.62 markus 1136: } else {
1137: in = dup(STDIN_FILENO);
1138: }
1.60 markus 1139: out = dup(STDOUT_FILENO);
1140: err = dup(STDERR_FILENO);
1.45 markus 1141:
1142: if (in < 0 || out < 0 || err < 0)
1.62 markus 1143: fatal("dup() in/out/err failed");
1.45 markus 1144:
1.69 markus 1145: /* enable nonblocking unless tty */
1146: if (!isatty(in))
1147: set_nonblock(in);
1148: if (!isatty(out))
1149: set_nonblock(out);
1150: if (!isatty(err))
1151: set_nonblock(err);
1152:
1.65 markus 1153: window = CHAN_SES_WINDOW_DEFAULT;
1154: packetmax = CHAN_SES_PACKET_DEFAULT;
1.164 markus 1155: if (tty_flag) {
1156: window >>= 1;
1157: packetmax >>= 1;
1.45 markus 1158: }
1.118 markus 1159: c = channel_new(
1.45 markus 1160: "session", SSH_CHANNEL_OPENING, in, out, err,
1.65 markus 1161: window, packetmax, CHAN_EXTENDED_WRITE,
1.192 markus 1162: "client-session", /*nonblock*/0);
1.45 markus 1163:
1.143 markus 1164: debug3("ssh_session2_open: channel_new: %d", c->self);
1.106 markus 1165:
1.122 markus 1166: channel_send_open(c->self);
1.143 markus 1167: if (!no_shell_flag)
1.214 djm 1168: channel_register_confirm(c->self, ssh_session2_setup, NULL);
1.106 markus 1169:
1.118 markus 1170: return c->self;
1.106 markus 1171: }
1172:
1.126 itojun 1173: static int
1.106 markus 1174: ssh_session2(void)
1175: {
1.143 markus 1176: int id = -1;
1.106 markus 1177:
1178: /* XXX should be pre-session */
1179: ssh_init_forwarding();
1.214 djm 1180: ssh_control_listener();
1.106 markus 1181:
1.143 markus 1182: if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN))
1183: id = ssh_session2_open();
1.255 reyk 1184:
1185: /* Execute a local command */
1186: if (options.local_command != NULL &&
1187: options.permit_local_command)
1188: ssh_local_cmd(options.local_command);
1.106 markus 1189:
1190: /* If requested, let ssh continue in the background. */
1191: if (fork_after_authentication_flag)
1192: if (daemon(1, 1) < 0)
1193: fatal("daemon() failed: %.200s", strerror(errno));
1.31 markus 1194:
1.119 stevesk 1195: return client_loop(tty_flag, tty_flag ?
1196: options.escape_char : SSH_ESCAPECHAR_NONE, id);
1.72 markus 1197: }
1198:
1.126 itojun 1199: static void
1.104 markus 1200: load_public_identity_files(void)
1201: {
1.275 djm 1202: char *filename, *cp, thishost[NI_MAXHOST];
1.167 markus 1203: int i = 0;
1.104 markus 1204: Key *public;
1.275 djm 1205: struct passwd *pw;
1.167 markus 1206: #ifdef SMARTCARD
1207: Key **keys;
1.104 markus 1208:
1.133 markus 1209: if (options.smartcard_device != NULL &&
1.167 markus 1210: options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
1211: (keys = sc_get_keys(options.smartcard_device, NULL)) != NULL ) {
1212: int count = 0;
1213: for (i = 0; keys[i] != NULL; i++) {
1214: count++;
1215: memmove(&options.identity_files[1], &options.identity_files[0],
1216: sizeof(char *) * (SSH_MAX_IDENTITY_FILES - 1));
1217: memmove(&options.identity_keys[1], &options.identity_keys[0],
1218: sizeof(Key *) * (SSH_MAX_IDENTITY_FILES - 1));
1219: options.num_identity_files++;
1220: options.identity_keys[0] = keys[i];
1.194 markus 1221: options.identity_files[0] = sc_get_key_label(keys[i]);
1.167 markus 1222: }
1.168 markus 1223: if (options.num_identity_files > SSH_MAX_IDENTITY_FILES)
1224: options.num_identity_files = SSH_MAX_IDENTITY_FILES;
1.167 markus 1225: i = count;
1226: xfree(keys);
1.127 markus 1227: }
1.136 jakob 1228: #endif /* SMARTCARD */
1.275 djm 1229: if ((pw = getpwuid(original_real_uid)) == NULL)
1230: fatal("load_public_identity_files: getpwuid failed");
1231: if (gethostname(thishost, sizeof(thishost)) == -1)
1232: fatal("load_public_identity_files: gethostname: %s",
1233: strerror(errno));
1.131 millert 1234: for (; i < options.num_identity_files; i++) {
1.275 djm 1235: cp = tilde_expand_filename(options.identity_files[i],
1.131 millert 1236: original_real_uid);
1.275 djm 1237: filename = percent_expand(cp, "d", pw->pw_dir,
1238: "u", pw->pw_name, "l", thishost, "h", host,
1239: "r", options.user, (char *)NULL);
1240: xfree(cp);
1.131 millert 1241: public = key_load_public(filename, NULL);
1242: debug("identity file %s type %d", filename,
1243: public ? public->type : -1);
1244: xfree(options.identity_files[i]);
1245: options.identity_files[i] = filename;
1246: options.identity_keys[i] = public;
1247: }
1.214 djm 1248: }
1249:
1250: static void
1251: control_client_sighandler(int signo)
1252: {
1253: control_client_terminate = signo;
1254: }
1255:
1256: static void
1257: control_client_sigrelay(int signo)
1258: {
1259: if (control_server_pid > 1)
1260: kill(control_server_pid, signo);
1261: }
1262:
1.220 djm 1263: static int
1264: env_permitted(char *env)
1265: {
1.282 dtucker 1266: int i, ret;
1.220 djm 1267: char name[1024], *cp;
1268:
1.282 dtucker 1269: if ((cp = strchr(env, '=')) == NULL || cp == env)
1.220 djm 1270: return (0);
1.284 stevesk 1271: ret = snprintf(name, sizeof(name), "%.*s", (int)(cp - env), env);
1.282 dtucker 1272: if (ret <= 0 || (size_t)ret >= sizeof(name))
1273: fatal("env_permitted: name '%.100s...' too long", env);
1.220 djm 1274:
1275: for (i = 0; i < options.num_send_env; i++)
1276: if (match_pattern(name, options.send_env[i]))
1277: return (1);
1278:
1279: return (0);
1280: }
1281:
1.214 djm 1282: static void
1283: control_client(const char *path)
1284: {
1285: struct sockaddr_un addr;
1.228 djm 1286: int i, r, fd, sock, exitval, num_env;
1.214 djm 1287: Buffer m;
1.229 djm 1288: char *term;
1.215 djm 1289: extern char **environ;
1.229 djm 1290: u_int flags;
1.242 djm 1291:
1292: if (mux_command == 0)
1293: mux_command = SSHMUX_COMMAND_OPEN;
1294:
1295: switch (options.control_master) {
1296: case SSHCTL_MASTER_AUTO:
1297: case SSHCTL_MASTER_AUTO_ASK:
1298: debug("auto-mux: Trying existing master");
1299: /* FALLTHROUGH */
1300: case SSHCTL_MASTER_NO:
1301: break;
1302: default:
1303: return;
1304: }
1.228 djm 1305:
1.214 djm 1306: memset(&addr, '\0', sizeof(addr));
1307: addr.sun_family = AF_UNIX;
1308: addr.sun_len = offsetof(struct sockaddr_un, sun_path) +
1309: strlen(path) + 1;
1310:
1311: if (strlcpy(addr.sun_path, path,
1312: sizeof(addr.sun_path)) >= sizeof(addr.sun_path))
1313: fatal("ControlPath too long");
1314:
1315: if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) < 0)
1316: fatal("%s socket(): %s", __func__, strerror(errno));
1317:
1.270 deraadt 1318: if (connect(sock, (struct sockaddr *)&addr, addr.sun_len) == -1) {
1.240 djm 1319: if (mux_command != SSHMUX_COMMAND_OPEN) {
1320: fatal("Control socket connect(%.100s): %s", path,
1321: strerror(errno));
1322: }
1.239 djm 1323: if (errno == ENOENT)
1.268 deraadt 1324: debug("Control socket \"%.100s\" does not exist", path);
1.239 djm 1325: else {
1.268 deraadt 1326: error("Control socket connect(%.100s): %s", path,
1.239 djm 1327: strerror(errno));
1328: }
1.268 deraadt 1329: close(sock);
1330: return;
1331: }
1.248 djm 1332:
1.268 deraadt 1333: if (stdin_null_flag) {
1334: if ((fd = open(_PATH_DEVNULL, O_RDONLY)) == -1)
1335: fatal("open(/dev/null): %s", strerror(errno));
1336: if (dup2(fd, STDIN_FILENO) == -1)
1337: fatal("dup2: %s", strerror(errno));
1338: if (fd > STDERR_FILENO)
1339: close(fd);
1340: }
1.248 djm 1341:
1.247 djm 1342: term = getenv("TERM");
1.229 djm 1343:
1344: flags = 0;
1345: if (tty_flag)
1346: flags |= SSHMUX_FLAG_TTY;
1347: if (subsystem_flag)
1348: flags |= SSHMUX_FLAG_SUBSYS;
1.247 djm 1349: if (options.forward_x11)
1350: flags |= SSHMUX_FLAG_X11_FWD;
1351: if (options.forward_agent)
1352: flags |= SSHMUX_FLAG_AGENT_FWD;
1.214 djm 1353:
1354: buffer_init(&m);
1355:
1.229 djm 1356: /* Send our command to server */
1357: buffer_put_int(&m, mux_command);
1358: buffer_put_int(&m, flags);
1.247 djm 1359: if (ssh_msg_send(sock, SSHMUX_VER, &m) == -1)
1.229 djm 1360: fatal("%s: msg_send", __func__);
1361: buffer_clear(&m);
1362:
1363: /* Get authorisation status and PID of controlee */
1.214 djm 1364: if (ssh_msg_recv(sock, &m) == -1)
1365: fatal("%s: msg_recv", __func__);
1.247 djm 1366: if (buffer_get_char(&m) != SSHMUX_VER)
1.214 djm 1367: fatal("%s: wrong version", __func__);
1.216 djm 1368: if (buffer_get_int(&m) != 1)
1369: fatal("Connection to master denied");
1.214 djm 1370: control_server_pid = buffer_get_int(&m);
1371:
1372: buffer_clear(&m);
1373:
1.229 djm 1374: switch (mux_command) {
1375: case SSHMUX_COMMAND_ALIVE_CHECK:
1.234 deraadt 1376: fprintf(stderr, "Master running (pid=%d)\r\n",
1.229 djm 1377: control_server_pid);
1378: exit(0);
1379: case SSHMUX_COMMAND_TERMINATE:
1380: fprintf(stderr, "Exit request sent.\r\n");
1381: exit(0);
1382: case SSHMUX_COMMAND_OPEN:
1383: /* continue below */
1384: break;
1385: default:
1386: fatal("silly mux_command %d", mux_command);
1387: }
1388:
1389: /* SSHMUX_COMMAND_OPEN */
1.247 djm 1390: buffer_put_cstring(&m, term ? term : "");
1.214 djm 1391: buffer_append(&command, "\0", 1);
1392: buffer_put_cstring(&m, buffer_ptr(&command));
1.215 djm 1393:
1.220 djm 1394: if (options.num_send_env == 0 || environ == NULL) {
1395: buffer_put_int(&m, 0);
1.223 deraadt 1396: } else {
1.220 djm 1397: /* Pass environment */
1398: num_env = 0;
1399: for (i = 0; environ[i] != NULL; i++)
1400: if (env_permitted(environ[i]))
1401: num_env++; /* Count */
1.223 deraadt 1402:
1.220 djm 1403: buffer_put_int(&m, num_env);
1404:
1.222 dtucker 1405: for (i = 0; environ[i] != NULL && num_env >= 0; i++)
1406: if (env_permitted(environ[i])) {
1407: num_env--;
1.220 djm 1408: buffer_put_cstring(&m, environ[i]);
1.222 dtucker 1409: }
1.220 djm 1410: }
1.214 djm 1411:
1.247 djm 1412: if (ssh_msg_send(sock, SSHMUX_VER, &m) == -1)
1.214 djm 1413: fatal("%s: msg_send", __func__);
1414:
1415: mm_send_fd(sock, STDIN_FILENO);
1416: mm_send_fd(sock, STDOUT_FILENO);
1417: mm_send_fd(sock, STDERR_FILENO);
1418:
1419: /* Wait for reply, so master has a chance to gather ttymodes */
1420: buffer_clear(&m);
1421: if (ssh_msg_recv(sock, &m) == -1)
1422: fatal("%s: msg_recv", __func__);
1.247 djm 1423: if (buffer_get_char(&m) != SSHMUX_VER)
1.229 djm 1424: fatal("%s: wrong version", __func__);
1.214 djm 1425: buffer_free(&m);
1.218 djm 1426:
1.226 djm 1427: signal(SIGHUP, control_client_sighandler);
1.218 djm 1428: signal(SIGINT, control_client_sighandler);
1429: signal(SIGTERM, control_client_sighandler);
1430: signal(SIGWINCH, control_client_sigrelay);
1.214 djm 1431:
1432: if (tty_flag)
1433: enter_raw_mode();
1434:
1435: /* Stick around until the controlee closes the client_fd */
1436: exitval = 0;
1437: for (;!control_client_terminate;) {
1438: r = read(sock, &exitval, sizeof(exitval));
1439: if (r == 0) {
1440: debug2("Received EOF from master");
1441: break;
1442: }
1443: if (r > 0)
1444: debug2("Received exit status from master %d", exitval);
1445: if (r == -1 && errno != EINTR)
1446: fatal("%s: read %s", __func__, strerror(errno));
1447: }
1448:
1449: if (control_client_terminate)
1450: debug2("Exiting on signal %d", control_client_terminate);
1451:
1452: close(sock);
1453:
1454: leave_raw_mode();
1455:
1456: if (tty_flag && options.log_level != SYSLOG_LEVEL_QUIET)
1457: fprintf(stderr, "Connection to master closed.\r\n");
1458:
1459: exit(exitval);
1.1 deraadt 1460: }
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