Annotation of src/usr.bin/ssh/ssh.c, Revision 1.340
1.340 ! djm 1: /* $OpenBSD: ssh.c,v 1.339 2010/06/25 23:10:30 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>
1.312 djm 44: #include <sys/ioctl.h>
1.326 dtucker 45: #include <sys/param.h>
1.312 djm 46: #include <sys/queue.h>
1.259 stevesk 47: #include <sys/resource.h>
1.280 stevesk 48: #include <sys/socket.h>
1.264 stevesk 49: #include <sys/stat.h>
1.312 djm 50: #include <sys/types.h>
51: #include <sys/time.h>
1.258 stevesk 52:
1.265 stevesk 53: #include <ctype.h>
1.285 stevesk 54: #include <errno.h>
1.281 stevesk 55: #include <fcntl.h>
1.286 stevesk 56: #include <netdb.h>
1.258 stevesk 57: #include <paths.h>
1.279 stevesk 58: #include <pwd.h>
1.263 stevesk 59: #include <signal.h>
1.287 stevesk 60: #include <stddef.h>
1.291 stevesk 61: #include <stdio.h>
1.290 stevesk 62: #include <stdlib.h>
1.289 stevesk 63: #include <string.h>
1.288 stevesk 64: #include <unistd.h>
1.49 markus 65:
66: #include <openssl/evp.h>
1.72 markus 67: #include <openssl/err.h>
1.1 deraadt 68:
1.293 deraadt 69: #include "xmalloc.h"
1.84 markus 70: #include "ssh.h"
71: #include "ssh1.h"
72: #include "ssh2.h"
73: #include "compat.h"
74: #include "cipher.h"
1.1 deraadt 75: #include "packet.h"
76: #include "buffer.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"
1.225 dtucker 93: #include "uidswap.h"
1.327 andreas 94: #include "roaming.h"
1.278 stevesk 95: #include "version.h"
1.49 markus 96:
1.333 markus 97: #ifdef ENABLE_PKCS11
98: #include "ssh-pkcs11.h"
1.137 jakob 99: #endif
1.127 markus 100:
1.49 markus 101: extern char *__progname;
1.1 deraadt 102:
1.316 djm 103: /* Flag indicating whether debug mode is on. May 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:
1.331 dtucker 127: /* forward stdio to remote host and port */
128: char *stdio_forward_host = NULL;
129: int stdio_forward_port = 0;
130:
1.33 markus 131: /*
132: * General data structure for command line options and options configurable
133: * in configuration files. See readconf.h.
134: */
1.1 deraadt 135: Options options;
136:
1.139 markus 137: /* optional user configfile */
138: char *config = NULL;
139:
1.33 markus 140: /*
141: * Name of the host we are connecting to. This is the name given on the
142: * command line, or the HostName specified for the user-supplied name in a
143: * configuration file.
144: */
1.1 deraadt 145: char *host;
146:
1.22 provos 147: /* socket address the host resolves to */
1.37 markus 148: struct sockaddr_storage hostaddr;
1.1 deraadt 149:
1.112 markus 150: /* Private host keys. */
1.173 markus 151: Sensitive sensitive_data;
1.1 deraadt 152:
1.10 dugsong 153: /* Original real UID. */
154: uid_t original_real_uid;
1.177 markus 155: uid_t original_effective_uid;
1.1 deraadt 156:
1.45 markus 157: /* command to be executed */
158: Buffer command;
159:
1.85 djm 160: /* Should we execute a command or invoke a subsystem? */
161: int subsystem_flag = 0;
162:
1.170 markus 163: /* # of replies received for global requests */
1.315 djm 164: static int remote_forward_confirms_received = 0;
1.170 markus 165:
1.186 djm 166: /* pid of proxycommand child process */
167: pid_t proxy_command_pid = 0;
1.313 djm 168:
169: /* mux.c */
170: extern int muxserver_sock;
171: extern u_int muxclient_command;
172:
1.186 djm 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,
1.321 jmc 180: "usage: ssh [-1246AaCfgKkMNnqsTtVvXxYy] [-b bind_address] [-c cipher_spec]\n"
1.251 jmc 181: " [-D [bind_address:]port] [-e escape_char] [-F configfile]\n"
1.334 jmc 182: " [-I pkcs11] [-i identity_file]\n"
183: " [-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"
1.331 dtucker 186: " [-W host:port] [-w local_tun[:remote_tun]]\n"
187: " [user@]hostname [command]\n"
1.208 markus 188: );
1.257 dtucker 189: exit(255);
1.1 deraadt 190: }
191:
1.126 itojun 192: static int ssh_session(void);
193: static int ssh_session2(void);
194: static void load_public_identity_files(void);
1.312 djm 195:
196: /* from muxclient.c */
197: void muxclient(const char *);
198: void muxserver_listen(void);
1.45 markus 199:
1.32 deraadt 200: /*
201: * Main program for the ssh client.
202: */
1.2 provos 203: int
204: main(int ac, char **av)
1.1 deraadt 205: {
1.326 dtucker 206: int i, r, opt, exit_status, use_syslog;
207: char *p, *cp, *line, *argv0, buf[MAXPATHLEN];
1.31 markus 208: struct stat st;
1.98 markus 209: struct passwd *pw;
1.303 djm 210: int dummy, timeout_ms;
1.144 stevesk 211: extern int optind, optreset;
212: extern char *optarg;
1.244 djm 213: struct servent *sp;
1.232 djm 214: Forward fwd;
1.250 djm 215:
216: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
217: sanitise_stdfd();
1.31 markus 218:
1.33 markus 219: /*
220: * Save the original real uid. It will be needed later (uid-swapping
221: * may clobber the real uid).
222: */
1.31 markus 223: original_real_uid = getuid();
224: original_effective_uid = geteuid();
225:
1.184 stevesk 226: /*
227: * Use uid-swapping to give up root privileges for the duration of
228: * option processing. We will re-instantiate the rights when we are
229: * ready to create the privileged port, and will permanently drop
230: * them when the port has been created (actually, when the connection
231: * has been made, as we may need to create the port several times).
232: */
233: PRIV_END;
234:
1.31 markus 235: /* If we are installed setuid root be careful to not drop core. */
236: if (original_real_uid != original_effective_uid) {
237: struct rlimit rlim;
238: rlim.rlim_cur = rlim.rlim_max = 0;
239: if (setrlimit(RLIMIT_CORE, &rlim) < 0)
240: fatal("setrlimit failed: %.100s", strerror(errno));
1.1 deraadt 241: }
1.107 markus 242: /* Get user data. */
243: pw = getpwuid(original_real_uid);
244: if (!pw) {
1.191 itojun 245: logit("You don't exist, go away!");
1.257 dtucker 246: exit(255);
1.107 markus 247: }
248: /* Take a copy of the returned structure. */
249: pw = pwcopy(pw);
1.31 markus 250:
1.33 markus 251: /*
252: * Set our umask to something reasonable, as some files are created
253: * with the default umask. This will make them world-readable but
254: * writable only by the owner, which is ok for all files for which we
255: * don't set the modes explicitly.
256: */
1.31 markus 257: umask(022);
258:
1.316 djm 259: /*
260: * Initialize option structure to indicate that no values have been
261: * set.
262: */
1.31 markus 263: initialize_options(&options);
264:
265: /* Parse command-line arguments. */
266: host = NULL;
1.320 djm 267: use_syslog = 0;
1.325 markus 268: argv0 = av[0];
1.31 markus 269:
1.266 djm 270: again:
1.316 djm 271: while ((opt = getopt(ac, av, "1246ab:c:e:fgi:kl:m:no:p:qstvx"
1.331 dtucker 272: "ACD:F:I:KL:MNO:PR:S:TVw:W:XYy")) != -1) {
1.31 markus 273: switch (opt) {
1.91 jakob 274: case '1':
275: options.protocol = SSH_PROTO_1;
276: break;
1.47 markus 277: case '2':
278: options.protocol = SSH_PROTO_2;
279: break;
1.37 markus 280: case '4':
1.196 djm 281: options.address_family = AF_INET;
1.37 markus 282: break;
283: case '6':
1.196 djm 284: options.address_family = AF_INET6;
1.37 markus 285: break;
1.31 markus 286: case 'n':
287: stdin_null_flag = 1;
288: break;
289: case 'f':
290: fork_after_authentication_flag = 1;
291: stdin_null_flag = 1;
292: break;
293: case 'x':
294: options.forward_x11 = 0;
295: break;
296: case 'X':
297: options.forward_x11 = 1;
298: break;
1.320 djm 299: case 'y':
300: use_syslog = 1;
301: break;
1.202 markus 302: case 'Y':
303: options.forward_x11 = 1;
304: options.forward_x11_trusted = 1;
305: break;
1.31 markus 306: case 'g':
307: options.gateway_ports = 1;
308: break;
1.229 djm 309: case 'O':
1.332 djm 310: if (stdio_forward_host != NULL)
311: fatal("Cannot specify multiplexing "
312: "command with -W");
313: else if (muxclient_command != 0)
314: fatal("Multiplexing command already specified");
1.229 djm 315: if (strcmp(optarg, "check") == 0)
1.312 djm 316: muxclient_command = SSHMUX_COMMAND_ALIVE_CHECK;
1.338 markus 317: else if (strcmp(optarg, "forward") == 0)
318: muxclient_command = SSHMUX_COMMAND_FORWARD;
1.229 djm 319: else if (strcmp(optarg, "exit") == 0)
1.312 djm 320: muxclient_command = SSHMUX_COMMAND_TERMINATE;
1.229 djm 321: else
322: fatal("Invalid multiplex command.");
323: break;
1.183 stevesk 324: case 'P': /* deprecated */
1.31 markus 325: options.use_privileged_port = 0;
326: break;
327: case 'a':
328: options.forward_agent = 0;
1.53 markus 329: break;
330: case 'A':
331: options.forward_agent = 1;
1.31 markus 332: break;
333: case 'k':
1.204 dtucker 334: options.gss_deleg_creds = 0;
1.297 djm 335: break;
336: case 'K':
337: options.gss_authentication = 1;
338: options.gss_deleg_creds = 1;
1.31 markus 339: break;
340: case 'i':
341: if (stat(optarg, &st) < 0) {
1.128 fgsch 342: fprintf(stderr, "Warning: Identity file %s "
1.231 otto 343: "not accessible: %s.\n", optarg,
344: strerror(errno));
1.31 markus 345: break;
346: }
1.128 fgsch 347: if (options.num_identity_files >=
348: SSH_MAX_IDENTITY_FILES)
349: fatal("Too many identity files specified "
350: "(max %d)", SSH_MAX_IDENTITY_FILES);
351: options.identity_files[options.num_identity_files++] =
352: xstrdup(optarg);
1.31 markus 353: break;
1.127 markus 354: case 'I':
1.333 markus 355: #ifdef ENABLE_PKCS11
356: options.pkcs11_provider = xstrdup(optarg);
1.137 jakob 357: #else
1.333 markus 358: fprintf(stderr, "no support for PKCS#11.\n");
1.137 jakob 359: #endif
1.127 markus 360: break;
1.31 markus 361: case 't':
1.79 markus 362: if (tty_flag)
363: force_tty_flag = 1;
1.31 markus 364: tty_flag = 1;
365: break;
366: case 'v':
1.197 markus 367: if (debug_flag == 0) {
1.66 markus 368: debug_flag = 1;
369: options.log_level = SYSLOG_LEVEL_DEBUG1;
1.197 markus 370: } else {
371: if (options.log_level < SYSLOG_LEVEL_DEBUG3)
372: options.log_level++;
1.66 markus 373: break;
1.197 markus 374: }
1.227 deraadt 375: /* FALLTHROUGH */
1.31 markus 376: case 'V':
1.209 markus 377: fprintf(stderr, "%s, %s\n",
378: SSH_VERSION, SSLeay_version(SSLEAY_VERSION));
1.31 markus 379: if (opt == 'V')
380: exit(0);
381: break;
1.255 reyk 382: case 'w':
1.256 reyk 383: if (options.tun_open == -1)
384: options.tun_open = SSH_TUNMODE_DEFAULT;
1.255 reyk 385: options.tun_local = a2tun(optarg, &options.tun_remote);
1.256 reyk 386: if (options.tun_local == SSH_TUNID_ERR) {
1.316 djm 387: fprintf(stderr,
388: "Bad tun device '%s'\n", optarg);
1.257 dtucker 389: exit(255);
1.255 reyk 390: }
391: break;
1.331 dtucker 392: case 'W':
1.332 djm 393: if (stdio_forward_host != NULL)
394: fatal("stdio forward already specified");
395: if (muxclient_command != 0)
396: fatal("Cannot specify stdio forward with -O");
1.331 dtucker 397: if (parse_forward(&fwd, optarg, 1, 0)) {
398: stdio_forward_host = fwd.listen_host;
399: stdio_forward_port = fwd.listen_port;
400: xfree(fwd.connect_host);
401: } else {
402: fprintf(stderr,
403: "Bad stdio forwarding specification '%s'\n",
404: optarg);
405: exit(255);
406: }
407: no_tty_flag = 1;
408: no_shell_flag = 1;
409: options.clear_forwardings = 1;
410: options.exit_on_forward_failure = 1;
411: break;
1.31 markus 412: case 'q':
413: options.log_level = SYSLOG_LEVEL_QUIET;
414: break;
415: case 'e':
416: if (optarg[0] == '^' && optarg[2] == 0 &&
1.128 fgsch 417: (u_char) optarg[1] >= 64 &&
418: (u_char) optarg[1] < 128)
1.78 markus 419: options.escape_char = (u_char) optarg[1] & 31;
1.31 markus 420: else if (strlen(optarg) == 1)
1.78 markus 421: options.escape_char = (u_char) optarg[0];
1.31 markus 422: else if (strcmp(optarg, "none") == 0)
1.119 stevesk 423: options.escape_char = SSH_ESCAPECHAR_NONE;
1.31 markus 424: else {
1.128 fgsch 425: fprintf(stderr, "Bad escape character '%s'.\n",
426: optarg);
1.257 dtucker 427: exit(255);
1.31 markus 428: }
429: break;
430: case 'c':
1.49 markus 431: if (ciphers_valid(optarg)) {
432: /* SSH2 only */
433: options.ciphers = xstrdup(optarg);
1.224 markus 434: options.cipher = SSH_CIPHER_INVALID;
1.49 markus 435: } else {
436: /* SSH1 only */
1.74 markus 437: options.cipher = cipher_number(optarg);
438: if (options.cipher == -1) {
1.128 fgsch 439: fprintf(stderr,
440: "Unknown cipher type '%s'\n",
441: optarg);
1.257 dtucker 442: exit(255);
1.49 markus 443: }
1.128 fgsch 444: if (options.cipher == SSH_CIPHER_3DES)
1.74 markus 445: options.ciphers = "3des-cbc";
1.128 fgsch 446: else if (options.cipher == SSH_CIPHER_BLOWFISH)
1.74 markus 447: options.ciphers = "blowfish-cbc";
1.128 fgsch 448: else
1.74 markus 449: options.ciphers = (char *)-1;
1.95 markus 450: }
451: break;
452: case 'm':
453: if (mac_valid(optarg))
454: options.macs = xstrdup(optarg);
455: else {
1.128 fgsch 456: fprintf(stderr, "Unknown mac type '%s'\n",
457: optarg);
1.257 dtucker 458: exit(255);
1.31 markus 459: }
460: break;
1.214 djm 461: case 'M':
1.242 djm 462: if (options.control_master == SSHCTL_MASTER_YES)
463: options.control_master = SSHCTL_MASTER_ASK;
464: else
465: options.control_master = SSHCTL_MASTER_YES;
1.214 djm 466: break;
1.31 markus 467: case 'p':
1.113 stevesk 468: options.port = a2port(optarg);
1.323 djm 469: if (options.port <= 0) {
1.109 markus 470: fprintf(stderr, "Bad port '%s'\n", optarg);
1.257 dtucker 471: exit(255);
1.109 markus 472: }
1.31 markus 473: break;
474: case 'l':
475: options.user = optarg;
476: break;
1.141 stevesk 477:
478: case 'L':
1.324 djm 479: if (parse_forward(&fwd, optarg, 0, 0))
1.232 djm 480: add_local_forward(&options, &fwd);
481: else {
1.128 fgsch 482: fprintf(stderr,
1.232 djm 483: "Bad local forwarding specification '%s'\n",
1.128 fgsch 484: optarg);
1.257 dtucker 485: exit(255);
1.31 markus 486: }
1.232 djm 487: break;
488:
489: case 'R':
1.324 djm 490: if (parse_forward(&fwd, optarg, 0, 1)) {
1.232 djm 491: add_remote_forward(&options, &fwd);
492: } else {
1.128 fgsch 493: fprintf(stderr,
1.232 djm 494: "Bad remote forwarding specification "
495: "'%s'\n", optarg);
1.257 dtucker 496: exit(255);
1.31 markus 497: }
498: break;
1.108 markus 499:
500: case 'D':
1.324 djm 501: if (parse_forward(&fwd, optarg, 1, 0)) {
1.322 stevesk 502: add_local_forward(&options, &fwd);
1.232 djm 503: } else {
1.322 stevesk 504: fprintf(stderr,
505: "Bad dynamic forwarding specification "
506: "'%s'\n", optarg);
1.257 dtucker 507: exit(255);
1.109 markus 508: }
1.108 markus 509: break;
510:
1.31 markus 511: case 'C':
512: options.compression = 1;
513: break;
1.45 markus 514: case 'N':
515: no_shell_flag = 1;
516: no_tty_flag = 1;
517: break;
518: case 'T':
519: no_tty_flag = 1;
520: break;
1.31 markus 521: case 'o':
522: dummy = 1;
1.205 markus 523: line = xstrdup(optarg);
1.128 fgsch 524: if (process_config_line(&options, host ? host : "",
1.205 markus 525: line, "command-line", 0, &dummy) != 0)
1.257 dtucker 526: exit(255);
1.205 markus 527: xfree(line);
1.31 markus 528: break;
1.85 djm 529: case 's':
530: subsystem_flag = 1;
1.117 markus 531: break;
1.214 djm 532: case 'S':
533: if (options.control_path != NULL)
534: free(options.control_path);
535: options.control_path = xstrdup(optarg);
536: break;
1.117 markus 537: case 'b':
538: options.bind_address = optarg;
1.85 djm 539: break;
1.139 markus 540: case 'F':
541: config = optarg;
542: break;
1.31 markus 543: default:
544: usage();
1.1 deraadt 545: }
1.31 markus 546: }
547:
1.128 fgsch 548: ac -= optind;
549: av += optind;
550:
1.329 guenther 551: if (ac > 0 && !host) {
1.188 markus 552: if (strrchr(*av, '@')) {
1.128 fgsch 553: p = xstrdup(*av);
1.188 markus 554: cp = strrchr(p, '@');
1.128 fgsch 555: if (cp == NULL || cp == p)
556: usage();
557: options.user = p;
558: *cp = '\0';
559: host = ++cp;
560: } else
561: host = *av;
1.189 millert 562: if (ac > 1) {
563: optind = optreset = 1;
1.128 fgsch 564: goto again;
565: }
1.189 millert 566: ac--, av++;
1.128 fgsch 567: }
568:
1.31 markus 569: /* Check that we got a host name. */
570: if (!host)
571: usage();
572:
1.54 markus 573: SSLeay_add_all_algorithms();
1.72 markus 574: ERR_load_crypto_strings();
1.31 markus 575:
576: /* Initialize the command to execute on remote host. */
577: buffer_init(&command);
1.1 deraadt 578:
1.33 markus 579: /*
580: * Save the command to execute on the remote host in a buffer. There
581: * is no limit on the length of the command, except by the maximum
582: * packet size. Also sets the tty flag if there is no command.
583: */
1.128 fgsch 584: if (!ac) {
1.31 markus 585: /* No command specified - execute shell on a tty. */
586: tty_flag = 1;
1.85 djm 587: if (subsystem_flag) {
1.128 fgsch 588: fprintf(stderr,
589: "You must specify a subsystem to invoke.\n");
1.85 djm 590: usage();
591: }
1.31 markus 592: } else {
1.128 fgsch 593: /* A command has been specified. Store it into the buffer. */
594: for (i = 0; i < ac; i++) {
595: if (i)
1.31 markus 596: buffer_append(&command, " ", 1);
597: buffer_append(&command, av[i], strlen(av[i]));
598: }
599: }
600:
601: /* Cannot fork to background if no command. */
1.316 djm 602: if (fork_after_authentication_flag && buffer_len(&command) == 0 &&
603: !no_shell_flag)
604: fatal("Cannot fork into background without a command "
605: "to execute.");
1.31 markus 606:
607: /* Allocate a tty by default if no command specified. */
608: if (buffer_len(&command) == 0)
609: tty_flag = 1;
610:
1.180 deraadt 611: /* Force no tty */
1.336 djm 612: if (no_tty_flag || muxclient_command != 0)
1.75 markus 613: tty_flag = 0;
1.31 markus 614: /* Do not allocate a tty if stdin is not a tty. */
1.236 djm 615: if ((!isatty(fileno(stdin)) || stdin_null_flag) && !force_tty_flag) {
1.31 markus 616: if (tty_flag)
1.316 djm 617: logit("Pseudo-terminal will not be allocated because "
618: "stdin is not a terminal.");
1.31 markus 619: tty_flag = 0;
620: }
1.45 markus 621:
1.101 markus 622: /*
623: * Initialize "log" output. Since we are the client all output
624: * actually goes to stderr.
625: */
1.325 markus 626: log_init(argv0,
1.316 djm 627: options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level,
1.320 djm 628: SYSLOG_FACILITY_USER, !use_syslog);
1.31 markus 629:
1.139 markus 630: /*
631: * Read per-user configuration file. Ignore the system wide config
632: * file if the user specifies a config file on the command line.
633: */
634: if (config != NULL) {
1.211 djm 635: if (!read_config_file(config, host, &options, 0))
1.142 stevesk 636: fatal("Can't open user config file %.100s: "
637: "%.100s", config, strerror(errno));
1.295 stevesk 638: } else {
1.326 dtucker 639: r = snprintf(buf, sizeof buf, "%s/%s", pw->pw_dir,
1.139 markus 640: _PATH_SSH_USER_CONFFILE);
1.326 dtucker 641: if (r > 0 && (size_t)r < sizeof(buf))
642: (void)read_config_file(buf, host, &options, 1);
1.139 markus 643:
1.145 markus 644: /* Read systemwide configuration file after use config. */
1.223 deraadt 645: (void)read_config_file(_PATH_HOST_CONFIG_FILE, host,
1.210 djm 646: &options, 0);
1.139 markus 647: }
1.31 markus 648:
649: /* Fill configuration defaults. */
650: fill_default_options(&options);
651:
1.196 djm 652: channel_set_af(options.address_family);
653:
1.31 markus 654: /* reinit */
1.325 markus 655: log_init(argv0, options.log_level, SYSLOG_FACILITY_USER, !use_syslog);
1.31 markus 656:
657: if (options.user == NULL)
658: options.user = xstrdup(pw->pw_name);
659:
1.317 dtucker 660: /* Get default port if port has not been set. */
661: if (options.port == 0) {
662: sp = getservbyname(SSH_SERVICE_NAME, "tcp");
663: options.port = sp ? ntohs(sp->s_port) : SSH_DEFAULT_PORT;
664: }
665:
666: if (options.local_command != NULL) {
667: char thishost[NI_MAXHOST];
668:
669: if (gethostname(thishost, sizeof(thishost)) == -1)
670: fatal("gethostname: %s", strerror(errno));
671: snprintf(buf, sizeof(buf), "%d", options.port);
672: debug3("expanding LocalCommand: %s", options.local_command);
673: cp = options.local_command;
674: options.local_command = percent_expand(cp, "d", pw->pw_dir,
675: "h", options.hostname? options.hostname : host,
676: "l", thishost, "n", host, "r", options.user, "p", buf,
677: "u", pw->pw_name, (char *)NULL);
678: debug3("expanded LocalCommand: %s", options.local_command);
679: xfree(cp);
680: }
681:
1.31 markus 682: if (options.hostname != NULL)
683: host = options.hostname;
1.195 markus 684:
685: /* force lowercase for hostkey matching */
686: if (options.host_key_alias != NULL) {
687: for (p = options.host_key_alias; *p; p++)
688: if (isupper(*p))
1.271 deraadt 689: *p = (char)tolower(*p);
1.246 djm 690: }
691:
1.190 markus 692: if (options.proxy_command != NULL &&
1.304 dtucker 693: strcmp(options.proxy_command, "none") == 0) {
694: xfree(options.proxy_command);
1.190 markus 695: options.proxy_command = NULL;
1.304 dtucker 696: }
1.245 djm 697: if (options.control_path != NULL &&
1.304 dtucker 698: strcmp(options.control_path, "none") == 0) {
699: xfree(options.control_path);
1.245 djm 700: options.control_path = NULL;
1.304 dtucker 701: }
1.31 markus 702:
1.214 djm 703: if (options.control_path != NULL) {
1.275 djm 704: char thishost[NI_MAXHOST];
1.261 djm 705:
1.275 djm 706: if (gethostname(thishost, sizeof(thishost)) == -1)
1.261 djm 707: fatal("gethostname: %s", strerror(errno));
1.241 djm 708: snprintf(buf, sizeof(buf), "%d", options.port);
709: cp = tilde_expand_filename(options.control_path,
710: original_real_uid);
1.304 dtucker 711: xfree(options.control_path);
1.241 djm 712: options.control_path = percent_expand(cp, "p", buf, "h", host,
1.275 djm 713: "r", options.user, "l", thishost, (char *)NULL);
1.241 djm 714: xfree(cp);
1.214 djm 715: }
1.312 djm 716: if (muxclient_command != 0 && options.control_path == NULL)
1.240 djm 717: fatal("No ControlPath specified for \"-O\" command");
1.242 djm 718: if (options.control_path != NULL)
1.312 djm 719: muxclient(options.control_path);
1.214 djm 720:
1.303 djm 721: timeout_ms = options.connection_timeout * 1000;
722:
1.77 markus 723: /* Open a connection to the remote host. */
1.203 djm 724: if (ssh_connect(host, &hostaddr, options.port,
1.303 djm 725: options.address_family, options.connection_attempts, &timeout_ms,
726: options.tcp_keep_alive,
1.177 markus 727: original_effective_uid == 0 && options.use_privileged_port,
1.179 markus 728: options.proxy_command) != 0)
1.257 dtucker 729: exit(255);
1.31 markus 730:
1.303 djm 731: if (timeout_ms > 0)
732: debug3("timeout: %d ms remain after connect", timeout_ms);
733:
1.33 markus 734: /*
735: * If we successfully made the connection, load the host private key
736: * in case we will need it later for combined rsa-rhosts
737: * authentication. This must be done before releasing extra
738: * privileges, because the file is only readable by root.
1.174 markus 739: * If we cannot access the private keys, load the public keys
740: * instead and try to execute the ssh-keysign helper instead.
1.33 markus 741: */
1.112 markus 742: sensitive_data.nkeys = 0;
743: sensitive_data.keys = NULL;
1.173 markus 744: sensitive_data.external_keysign = 0;
1.178 markus 745: if (options.rhosts_rsa_authentication ||
746: options.hostbased_authentication) {
1.112 markus 747: sensitive_data.nkeys = 3;
1.274 deraadt 748: sensitive_data.keys = xcalloc(sensitive_data.nkeys,
1.180 deraadt 749: sizeof(Key));
1.177 markus 750:
751: PRIV_START;
1.112 markus 752: sensitive_data.keys[0] = key_load_private_type(KEY_RSA1,
1.276 dtucker 753: _PATH_HOST_KEY_FILE, "", NULL, NULL);
1.112 markus 754: sensitive_data.keys[1] = key_load_private_type(KEY_DSA,
1.276 dtucker 755: _PATH_HOST_DSA_KEY_FILE, "", NULL, NULL);
1.112 markus 756: sensitive_data.keys[2] = key_load_private_type(KEY_RSA,
1.276 dtucker 757: _PATH_HOST_RSA_KEY_FILE, "", NULL, NULL);
1.177 markus 758: PRIV_END;
1.173 markus 759:
1.181 markus 760: if (options.hostbased_authentication == 1 &&
761: sensitive_data.keys[0] == NULL &&
1.173 markus 762: sensitive_data.keys[1] == NULL &&
763: sensitive_data.keys[2] == NULL) {
764: sensitive_data.keys[1] = key_load_public(
765: _PATH_HOST_DSA_KEY_FILE, NULL);
766: sensitive_data.keys[2] = key_load_public(
767: _PATH_HOST_RSA_KEY_FILE, NULL);
768: sensitive_data.external_keysign = 1;
769: }
1.31 markus 770: }
1.33 markus 771: /*
772: * Get rid of any extra privileges that we may have. We will no
773: * longer need them. Also, extra privileges could make it very hard
774: * to read identity files and other non-world-readable files from the
775: * user's home directory if it happens to be on a NFS volume where
776: * root is mapped to nobody.
777: */
1.225 dtucker 778: if (original_effective_uid == 0) {
779: PRIV_START;
780: permanently_set_uid(pw);
781: }
1.31 markus 782:
1.33 markus 783: /*
784: * Now that we are back to our own permissions, create ~/.ssh
1.254 djm 785: * directory if it doesn't already exist.
1.33 markus 786: */
1.326 dtucker 787: r = snprintf(buf, sizeof buf, "%s%s%s", pw->pw_dir,
1.316 djm 788: strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR);
1.326 dtucker 789: if (r > 0 && (size_t)r < sizeof(buf) && stat(buf, &st) < 0)
1.57 djm 790: if (mkdir(buf, 0700) < 0)
1.31 markus 791: error("Could not create directory '%.200s'.", buf);
792:
1.104 markus 793: /* load options.identity_files */
794: load_public_identity_files();
795:
796: /* Expand ~ in known host file names. */
797: /* XXX mem-leaks: */
1.72 markus 798: options.system_hostfile =
799: tilde_expand_filename(options.system_hostfile, original_real_uid);
800: options.user_hostfile =
801: tilde_expand_filename(options.user_hostfile, original_real_uid);
802: options.system_hostfile2 =
803: tilde_expand_filename(options.system_hostfile2, original_real_uid);
804: options.user_hostfile2 =
805: tilde_expand_filename(options.user_hostfile2, original_real_uid);
1.149 markus 806:
807: signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
1.31 markus 808:
1.316 djm 809: /* Log into the remote system. Never returns if the login fails. */
1.303 djm 810: ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr,
811: pw, timeout_ms);
1.339 djm 812:
813: if (packet_connection_is_on_socket()) {
814: verbose("Authenticated to %s ([%s]:%d).", host,
815: get_remote_ipaddr(), get_remote_port());
816: } else {
817: verbose("Authenticated to %s (via proxy).", host);
818: }
1.31 markus 819:
1.112 markus 820: /* We no longer need the private host keys. Clear them now. */
821: if (sensitive_data.nkeys != 0) {
822: for (i = 0; i < sensitive_data.nkeys; i++) {
823: if (sensitive_data.keys[i] != NULL) {
824: /* Destroys contents safely */
825: debug3("clear hostkey %d", i);
826: key_free(sensitive_data.keys[i]);
827: sensitive_data.keys[i] = NULL;
828: }
829: }
830: xfree(sensitive_data.keys);
1.134 markus 831: }
832: for (i = 0; i < options.num_identity_files; i++) {
833: if (options.identity_files[i]) {
834: xfree(options.identity_files[i]);
835: options.identity_files[i] = NULL;
836: }
837: if (options.identity_keys[i]) {
838: key_free(options.identity_keys[i]);
839: options.identity_keys[i] = NULL;
840: }
1.112 markus 841: }
1.31 markus 842:
1.45 markus 843: exit_status = compat20 ? ssh_session2() : ssh_session();
844: packet_close();
1.186 djm 845:
1.312 djm 846: if (options.control_path != NULL && muxserver_sock != -1)
1.214 djm 847: unlink(options.control_path);
848:
1.186 djm 849: /*
1.203 djm 850: * Send SIGHUP to proxy command if used. We don't wait() in
1.186 djm 851: * case it hangs and instead rely on init to reap the child
852: */
853: if (proxy_command_pid > 1)
854: kill(proxy_command_pid, SIGHUP);
855:
1.45 markus 856: return exit_status;
857: }
858:
1.315 djm 859: /* Callback for remote forward global requests */
860: static void
861: ssh_confirm_remote_forward(int type, u_int32_t seq, void *ctxt)
862: {
863: Forward *rfwd = (Forward *)ctxt;
864:
1.324 djm 865: /* XXX verbose() on failure? */
1.315 djm 866: debug("remote forward %s for: listen %d, connect %s:%d",
867: type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
868: rfwd->listen_port, rfwd->connect_host, rfwd->connect_port);
1.324 djm 869: if (type == SSH2_MSG_REQUEST_SUCCESS && rfwd->listen_port == 0) {
1.338 markus 870: rfwd->allocated_port = packet_get_int();
1.324 djm 871: logit("Allocated port %u for remote forward to %s:%d",
1.338 markus 872: rfwd->allocated_port,
873: rfwd->connect_host, rfwd->connect_port);
1.324 djm 874: }
875:
1.315 djm 876: if (type == SSH2_MSG_REQUEST_FAILURE) {
877: if (options.exit_on_forward_failure)
878: fatal("Error: remote port forwarding failed for "
879: "listen port %d", rfwd->listen_port);
880: else
881: logit("Warning: remote port forwarding failed for "
882: "listen port %d", rfwd->listen_port);
883: }
1.318 djm 884: if (++remote_forward_confirms_received == options.num_remote_forwards) {
1.315 djm 885: debug("All remote forwarding requests processed");
1.318 djm 886: if (fork_after_authentication_flag) {
887: fork_after_authentication_flag = 0;
888: if (daemon(1, 1) < 0)
889: fatal("daemon() failed: %.200s",
890: strerror(errno));
891: }
892: }
1.315 djm 893: }
894:
1.126 itojun 895: static void
1.331 dtucker 896: client_cleanup_stdio_fwd(int id, void *arg)
897: {
898: debug("stdio forwarding: done");
899: cleanup_exit(0);
900: }
901:
902: static int
903: client_setup_stdio_fwd(const char *host_to_connect, u_short port_to_connect)
904: {
905: Channel *c;
1.332 djm 906: int in, out;
1.331 dtucker 907:
908: debug3("client_setup_stdio_fwd %s:%d", host_to_connect,
909: port_to_connect);
1.332 djm 910:
911: in = dup(STDIN_FILENO);
912: out = dup(STDOUT_FILENO);
913: if (in < 0 || out < 0)
914: fatal("channel_connect_stdio_fwd: dup() in/out failed");
915:
916: if ((c = channel_connect_stdio_fwd(host_to_connect, port_to_connect,
917: in, out)) == NULL)
1.331 dtucker 918: return 0;
919: channel_register_cleanup(c->self, client_cleanup_stdio_fwd, 0);
920: return 1;
921: }
922:
923: static void
1.70 markus 924: ssh_init_forwarding(void)
925: {
1.86 markus 926: int success = 0;
1.70 markus 927: int i;
1.331 dtucker 928:
929: if (stdio_forward_host != NULL) {
930: if (!compat20) {
931: fatal("stdio forwarding require Protocol 2");
932: }
933: if (!client_setup_stdio_fwd(stdio_forward_host,
934: stdio_forward_port))
935: fatal("Failed to connect in stdio forward mode.");
936: }
1.86 markus 937:
1.70 markus 938: /* Initiate local TCP/IP port forwardings. */
939: for (i = 0; i < options.num_local_forwards; i++) {
1.232 djm 940: debug("Local connections to %.200s:%d forwarded to remote "
941: "address %.200s:%d",
1.234 deraadt 942: (options.local_forwards[i].listen_host == NULL) ?
943: (options.gateway_ports ? "*" : "LOCALHOST") :
1.232 djm 944: options.local_forwards[i].listen_host,
945: options.local_forwards[i].listen_port,
946: options.local_forwards[i].connect_host,
947: options.local_forwards[i].connect_port);
1.158 markus 948: success += channel_setup_local_fwd_listener(
1.232 djm 949: options.local_forwards[i].listen_host,
950: options.local_forwards[i].listen_port,
951: options.local_forwards[i].connect_host,
952: options.local_forwards[i].connect_port,
1.70 markus 953: options.gateway_ports);
954: }
1.283 markus 955: if (i > 0 && success != i && options.exit_on_forward_failure)
956: fatal("Could not request local forwarding.");
1.86 markus 957: if (i > 0 && success == 0)
958: error("Could not request local forwarding.");
1.70 markus 959:
960: /* Initiate remote TCP/IP port forwardings. */
961: for (i = 0; i < options.num_remote_forwards; i++) {
1.232 djm 962: debug("Remote connections from %.200s:%d forwarded to "
963: "local address %.200s:%d",
1.248 djm 964: (options.remote_forwards[i].listen_host == NULL) ?
1.253 djm 965: "LOCALHOST" : options.remote_forwards[i].listen_host,
1.232 djm 966: options.remote_forwards[i].listen_port,
967: options.remote_forwards[i].connect_host,
968: options.remote_forwards[i].connect_port);
1.283 markus 969: if (channel_request_remote_forwarding(
1.232 djm 970: options.remote_forwards[i].listen_host,
971: options.remote_forwards[i].listen_port,
972: options.remote_forwards[i].connect_host,
1.283 markus 973: options.remote_forwards[i].connect_port) < 0) {
974: if (options.exit_on_forward_failure)
975: fatal("Could not request remote forwarding.");
976: else
977: logit("Warning: Could not request remote "
978: "forwarding.");
979: }
1.315 djm 980: client_register_global_confirm(ssh_confirm_remote_forward,
981: &options.remote_forwards[i]);
1.70 markus 982: }
1.301 djm 983:
984: /* Initiate tunnel forwarding. */
985: if (options.tun_open != SSH_TUNMODE_NO) {
986: if (client_request_tun_fwd(options.tun_open,
987: options.tun_local, options.tun_remote) == -1) {
988: if (options.exit_on_forward_failure)
989: fatal("Could not request tunnel forwarding.");
990: else
991: error("Could not request tunnel forwarding.");
992: }
993: }
1.70 markus 994: }
995:
1.126 itojun 996: static void
1.70 markus 997: check_agent_present(void)
998: {
999: if (options.forward_agent) {
1.254 djm 1000: /* Clear agent forwarding if we don't have an agent. */
1.185 stevesk 1001: if (!ssh_agent_present())
1.70 markus 1002: options.forward_agent = 0;
1003: }
1004: }
1005:
1.126 itojun 1006: static int
1.45 markus 1007: ssh_session(void)
1008: {
1009: int type;
1010: int interactive = 0;
1011: int have_tty = 0;
1012: struct winsize ws;
1013: char *cp;
1.243 djm 1014: const char *display;
1.45 markus 1015:
1.31 markus 1016: /* Enable compression if requested. */
1017: if (options.compression) {
1.316 djm 1018: debug("Requesting compression at level %d.",
1019: options.compression_level);
1.31 markus 1020:
1.316 djm 1021: if (options.compression_level < 1 ||
1022: options.compression_level > 9)
1023: fatal("Compression level must be from 1 (fast) to "
1024: "9 (slow, best).");
1.31 markus 1025:
1026: /* Send the request. */
1027: packet_start(SSH_CMSG_REQUEST_COMPRESSION);
1028: packet_put_int(options.compression_level);
1029: packet_send();
1030: packet_write_wait();
1.156 markus 1031: type = packet_read();
1.31 markus 1032: if (type == SSH_SMSG_SUCCESS)
1033: packet_start_compression(options.compression_level);
1034: else if (type == SSH_SMSG_FAILURE)
1.191 itojun 1035: logit("Warning: Remote host refused compression.");
1.31 markus 1036: else
1.316 djm 1037: packet_disconnect("Protocol error waiting for "
1038: "compression response.");
1.31 markus 1039: }
1040: /* Allocate a pseudo tty if appropriate. */
1041: if (tty_flag) {
1042: debug("Requesting pty.");
1043:
1044: /* Start the packet. */
1045: packet_start(SSH_CMSG_REQUEST_PTY);
1046:
1047: /* Store TERM in the packet. There is no limit on the
1048: length of the string. */
1049: cp = getenv("TERM");
1050: if (!cp)
1051: cp = "";
1.124 markus 1052: packet_put_cstring(cp);
1.31 markus 1053:
1054: /* Store window size in the packet. */
1055: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
1056: memset(&ws, 0, sizeof(ws));
1.269 deraadt 1057: packet_put_int((u_int)ws.ws_row);
1058: packet_put_int((u_int)ws.ws_col);
1059: packet_put_int((u_int)ws.ws_xpixel);
1060: packet_put_int((u_int)ws.ws_ypixel);
1.31 markus 1061:
1062: /* Store tty modes in the packet. */
1.115 stevesk 1063: tty_make_modes(fileno(stdin), NULL);
1.31 markus 1064:
1065: /* Send the packet, and wait for it to leave. */
1066: packet_send();
1067: packet_write_wait();
1068:
1069: /* Read response from the server. */
1.156 markus 1070: type = packet_read();
1.43 markus 1071: if (type == SSH_SMSG_SUCCESS) {
1.31 markus 1072: interactive = 1;
1.45 markus 1073: have_tty = 1;
1.43 markus 1074: } else if (type == SSH_SMSG_FAILURE)
1.316 djm 1075: logit("Warning: Remote host failed or refused to "
1076: "allocate a pseudo tty.");
1.31 markus 1077: else
1.316 djm 1078: packet_disconnect("Protocol error waiting for pty "
1079: "request response.");
1.31 markus 1080: }
1081: /* Request X11 forwarding if enabled and DISPLAY is set. */
1.243 djm 1082: display = getenv("DISPLAY");
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,
1.340 ! djm 1087: options.forward_x11_trusted,
! 1088: options.forward_x11_timeout,
! 1089: &proto, &data);
1.50 markus 1090: /* Request forwarding with authentication spoofing. */
1.316 djm 1091: debug("Requesting X11 forwarding with authentication "
1092: "spoofing.");
1.243 djm 1093: x11_request_forwarding_with_spoofing(0, display, proto, data);
1.31 markus 1094:
1095: /* Read response from the server. */
1.156 markus 1096: type = packet_read();
1.31 markus 1097: if (type == SSH_SMSG_SUCCESS) {
1098: interactive = 1;
1.50 markus 1099: } else if (type == SSH_SMSG_FAILURE) {
1.191 itojun 1100: logit("Warning: Remote host denied X11 forwarding.");
1.50 markus 1101: } else {
1.316 djm 1102: packet_disconnect("Protocol error waiting for X11 "
1103: "forwarding");
1.50 markus 1104: }
1.31 markus 1105: }
1106: /* Tell the packet module whether this is an interactive session. */
1.80 markus 1107: packet_set_interactive(interactive);
1.31 markus 1108:
1109: /* Request authentication agent forwarding if appropriate. */
1.70 markus 1110: check_agent_present();
1111:
1.31 markus 1112: if (options.forward_agent) {
1113: debug("Requesting authentication agent forwarding.");
1114: auth_request_forwarding();
1115:
1116: /* Read response from the server. */
1.156 markus 1117: type = packet_read();
1.155 markus 1118: packet_check_eom();
1.31 markus 1119: if (type != SSH_SMSG_SUCCESS)
1.191 itojun 1120: logit("Warning: Remote host denied authentication agent forwarding.");
1.31 markus 1121: }
1122:
1.70 markus 1123: /* Initiate port forwardings. */
1124: ssh_init_forwarding();
1.305 dtucker 1125:
1126: /* Execute a local command */
1127: if (options.local_command != NULL &&
1128: options.permit_local_command)
1129: ssh_local_cmd(options.local_command);
1.34 markus 1130:
1.318 djm 1131: /*
1132: * If requested and we are not interested in replies to remote
1133: * forwarding requests, then let ssh continue in the background.
1134: */
1135: if (fork_after_authentication_flag &&
1136: (!options.exit_on_forward_failure ||
1137: options.num_remote_forwards == 0)) {
1138: fork_after_authentication_flag = 0;
1.34 markus 1139: if (daemon(1, 1) < 0)
1140: fatal("daemon() failed: %.200s", strerror(errno));
1.318 djm 1141: }
1.31 markus 1142:
1.33 markus 1143: /*
1144: * If a command was specified on the command line, execute the
1145: * command now. Otherwise request the server to start a shell.
1146: */
1.31 markus 1147: if (buffer_len(&command) > 0) {
1148: int len = buffer_len(&command);
1149: if (len > 900)
1150: len = 900;
1.316 djm 1151: debug("Sending command: %.*s", len,
1152: (u_char *)buffer_ptr(&command));
1.31 markus 1153: packet_start(SSH_CMSG_EXEC_CMD);
1154: packet_put_string(buffer_ptr(&command), buffer_len(&command));
1155: packet_send();
1156: packet_write_wait();
1157: } else {
1158: debug("Requesting shell.");
1159: packet_start(SSH_CMSG_EXEC_SHELL);
1160: packet_send();
1161: packet_write_wait();
1162: }
1163:
1164: /* Enter the interactive session. */
1.119 stevesk 1165: return client_loop(have_tty, tty_flag ?
1166: options.escape_char : SSH_ESCAPECHAR_NONE, 0);
1.89 markus 1167: }
1168:
1.214 djm 1169: /* request pty/x11/agent/tcpfwd/shell for channel */
1170: static void
1.337 djm 1171: ssh_session2_setup(int id, int success, void *arg)
1.214 djm 1172: {
1.215 djm 1173: extern char **environ;
1.243 djm 1174: const char *display;
1175: int interactive = tty_flag;
1.337 djm 1176:
1177: if (!success)
1178: return; /* No need for error message, channels code sens one */
1.215 djm 1179:
1.248 djm 1180: display = getenv("DISPLAY");
1.243 djm 1181: if (options.forward_x11 && display != NULL) {
1.150 stevesk 1182: char *proto, *data;
1.50 markus 1183: /* Get reasonable local authentication information. */
1.243 djm 1184: client_x11_get_proto(display, options.xauth_location,
1.340 ! djm 1185: options.forward_x11_trusted,
! 1186: options.forward_x11_timeout, &proto, &data);
1.50 markus 1187: /* Request forwarding with authentication spoofing. */
1.316 djm 1188: debug("Requesting X11 forwarding with authentication "
1189: "spoofing.");
1.243 djm 1190: x11_request_forwarding_with_spoofing(id, display, proto, data);
1.80 markus 1191: interactive = 1;
1.50 markus 1192: /* XXX wait for reply */
1193: }
1194:
1.70 markus 1195: check_agent_present();
1196: if (options.forward_agent) {
1197: debug("Requesting authentication agent forwarding.");
1198: channel_request_start(id, "auth-agent-req@openssh.com", 0);
1199: packet_send();
1.212 djm 1200: }
1201:
1.214 djm 1202: client_session2_setup(id, tty_flag, subsystem_flag, getenv("TERM"),
1.311 djm 1203: NULL, fileno(stdin), &command, environ);
1.90 markus 1204:
1.80 markus 1205: packet_set_interactive(interactive);
1.45 markus 1206: }
1207:
1.143 markus 1208: /* open new channel for a session */
1.126 itojun 1209: static int
1.143 markus 1210: ssh_session2_open(void)
1.45 markus 1211: {
1.118 markus 1212: Channel *c;
1213: int window, packetmax, in, out, err;
1.60 markus 1214:
1.62 markus 1215: if (stdin_null_flag) {
1.93 itojun 1216: in = open(_PATH_DEVNULL, O_RDONLY);
1.62 markus 1217: } else {
1218: in = dup(STDIN_FILENO);
1219: }
1.60 markus 1220: out = dup(STDOUT_FILENO);
1221: err = dup(STDERR_FILENO);
1.45 markus 1222:
1223: if (in < 0 || out < 0 || err < 0)
1.62 markus 1224: fatal("dup() in/out/err failed");
1.45 markus 1225:
1.69 markus 1226: /* enable nonblocking unless tty */
1227: if (!isatty(in))
1228: set_nonblock(in);
1229: if (!isatty(out))
1230: set_nonblock(out);
1231: if (!isatty(err))
1232: set_nonblock(err);
1233:
1.65 markus 1234: window = CHAN_SES_WINDOW_DEFAULT;
1235: packetmax = CHAN_SES_PACKET_DEFAULT;
1.164 markus 1236: if (tty_flag) {
1237: window >>= 1;
1238: packetmax >>= 1;
1.45 markus 1239: }
1.118 markus 1240: c = channel_new(
1.45 markus 1241: "session", SSH_CHANNEL_OPENING, in, out, err,
1.65 markus 1242: window, packetmax, CHAN_EXTENDED_WRITE,
1.192 markus 1243: "client-session", /*nonblock*/0);
1.45 markus 1244:
1.143 markus 1245: debug3("ssh_session2_open: channel_new: %d", c->self);
1.106 markus 1246:
1.122 markus 1247: channel_send_open(c->self);
1.143 markus 1248: if (!no_shell_flag)
1.310 djm 1249: channel_register_open_confirm(c->self,
1250: ssh_session2_setup, NULL);
1.106 markus 1251:
1.118 markus 1252: return c->self;
1.106 markus 1253: }
1254:
1.126 itojun 1255: static int
1.106 markus 1256: ssh_session2(void)
1257: {
1.143 markus 1258: int id = -1;
1.106 markus 1259:
1260: /* XXX should be pre-session */
1261: ssh_init_forwarding();
1262:
1.143 markus 1263: if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN))
1264: id = ssh_session2_open();
1.314 djm 1265:
1266: /* If we don't expect to open a new session, then disallow it */
1.319 markus 1267: if (options.control_master == SSHCTL_MASTER_NO &&
1268: (datafellows & SSH_NEW_OPENSSH)) {
1.314 djm 1269: debug("Requesting no-more-sessions@openssh.com");
1270: packet_start(SSH2_MSG_GLOBAL_REQUEST);
1271: packet_put_cstring("no-more-sessions@openssh.com");
1272: packet_put_char(0);
1273: packet_send();
1274: }
1.255 reyk 1275:
1276: /* Execute a local command */
1277: if (options.local_command != NULL &&
1278: options.permit_local_command)
1279: ssh_local_cmd(options.local_command);
1.301 djm 1280:
1281: /* Start listening for multiplex clients */
1.312 djm 1282: muxserver_listen();
1.106 markus 1283:
1284: /* If requested, let ssh continue in the background. */
1.318 djm 1285: if (fork_after_authentication_flag) {
1286: fork_after_authentication_flag = 0;
1.106 markus 1287: if (daemon(1, 1) < 0)
1288: fatal("daemon() failed: %.200s", strerror(errno));
1.318 djm 1289: }
1.327 andreas 1290:
1291: if (options.use_roaming)
1292: request_roaming();
1.31 markus 1293:
1.119 stevesk 1294: return client_loop(tty_flag, tty_flag ?
1295: options.escape_char : SSH_ESCAPECHAR_NONE, id);
1.72 markus 1296: }
1297:
1.126 itojun 1298: static void
1.104 markus 1299: load_public_identity_files(void)
1300: {
1.275 djm 1301: char *filename, *cp, thishost[NI_MAXHOST];
1.306 deraadt 1302: char *pwdir = NULL, *pwname = NULL;
1.167 markus 1303: int i = 0;
1.104 markus 1304: Key *public;
1.275 djm 1305: struct passwd *pw;
1.335 djm 1306: u_int n_ids;
1307: char *identity_files[SSH_MAX_IDENTITY_FILES];
1308: Key *identity_keys[SSH_MAX_IDENTITY_FILES];
1.333 markus 1309: #ifdef ENABLE_PKCS11
1.167 markus 1310: Key **keys;
1.333 markus 1311: int nkeys;
1.335 djm 1312: #endif /* PKCS11 */
1.104 markus 1313:
1.335 djm 1314: n_ids = 0;
1315: bzero(identity_files, sizeof(identity_files));
1316: bzero(identity_keys, sizeof(identity_keys));
1317:
1318: #ifdef ENABLE_PKCS11
1.333 markus 1319: if (options.pkcs11_provider != NULL &&
1.167 markus 1320: options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
1.333 markus 1321: (pkcs11_init(!options.batch_mode) == 0) &&
1322: (nkeys = pkcs11_add_provider(options.pkcs11_provider, NULL,
1323: &keys)) > 0) {
1324: for (i = 0; i < nkeys; i++) {
1.335 djm 1325: if (n_ids >= SSH_MAX_IDENTITY_FILES) {
1326: key_free(keys[i]);
1327: continue;
1328: }
1329: identity_keys[n_ids] = keys[i];
1330: identity_files[n_ids] =
1.333 markus 1331: xstrdup(options.pkcs11_provider); /* XXX */
1.335 djm 1332: n_ids++;
1.167 markus 1333: }
1334: xfree(keys);
1.127 markus 1335: }
1.333 markus 1336: #endif /* ENABLE_PKCS11 */
1.275 djm 1337: if ((pw = getpwuid(original_real_uid)) == NULL)
1338: fatal("load_public_identity_files: getpwuid failed");
1.307 dtucker 1339: pwname = xstrdup(pw->pw_name);
1340: pwdir = xstrdup(pw->pw_dir);
1.275 djm 1341: if (gethostname(thishost, sizeof(thishost)) == -1)
1342: fatal("load_public_identity_files: gethostname: %s",
1343: strerror(errno));
1.335 djm 1344: for (i = 0; i < options.num_identity_files; i++) {
1345: if (n_ids >= SSH_MAX_IDENTITY_FILES) {
1346: xfree(options.identity_files[i]);
1347: continue;
1348: }
1.275 djm 1349: cp = tilde_expand_filename(options.identity_files[i],
1.131 millert 1350: original_real_uid);
1.306 deraadt 1351: filename = percent_expand(cp, "d", pwdir,
1352: "u", pwname, "l", thishost, "h", host,
1.275 djm 1353: "r", options.user, (char *)NULL);
1354: xfree(cp);
1.131 millert 1355: public = key_load_public(filename, NULL);
1356: debug("identity file %s type %d", filename,
1357: public ? public->type : -1);
1358: xfree(options.identity_files[i]);
1.335 djm 1359: identity_files[n_ids] = filename;
1360: identity_keys[n_ids] = public;
1361:
1362: if (++n_ids >= SSH_MAX_IDENTITY_FILES)
1363: continue;
1364:
1365: /* Try to add the certificate variant too */
1366: xasprintf(&cp, "%s-cert", filename);
1367: public = key_load_public(cp, NULL);
1368: debug("identity file %s type %d", cp,
1369: public ? public->type : -1);
1370: if (public == NULL) {
1371: xfree(cp);
1372: continue;
1373: }
1374: if (!key_is_cert(public)) {
1375: debug("%s: key %s type %s is not a certificate",
1376: __func__, cp, key_type(public));
1377: key_free(public);
1378: xfree(cp);
1379: continue;
1380: }
1381: identity_keys[n_ids] = public;
1382: /* point to the original path, most likely the private key */
1383: identity_files[n_ids] = xstrdup(filename);
1384: n_ids++;
1385: }
1386: options.num_identity_files = n_ids;
1387: memcpy(options.identity_files, identity_files, sizeof(identity_files));
1388: memcpy(options.identity_keys, identity_keys, sizeof(identity_keys));
1389:
1.306 deraadt 1390: bzero(pwname, strlen(pwname));
1.307 dtucker 1391: xfree(pwname);
1.306 deraadt 1392: bzero(pwdir, strlen(pwdir));
1.307 dtucker 1393: xfree(pwdir);
1.214 djm 1394: }
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