Annotation of src/usr.bin/ssh/ssh.c, Revision 1.377
1.377 ! djm 1: /* $OpenBSD: ssh.c,v 1.376 2013/04/19 01:06:50 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>
1.352 djm 52: #include <sys/wait.h>
1.258 stevesk 53:
1.265 stevesk 54: #include <ctype.h>
1.285 stevesk 55: #include <errno.h>
1.281 stevesk 56: #include <fcntl.h>
1.286 stevesk 57: #include <netdb.h>
1.258 stevesk 58: #include <paths.h>
1.279 stevesk 59: #include <pwd.h>
1.263 stevesk 60: #include <signal.h>
1.287 stevesk 61: #include <stddef.h>
1.291 stevesk 62: #include <stdio.h>
1.290 stevesk 63: #include <stdlib.h>
1.289 stevesk 64: #include <string.h>
1.288 stevesk 65: #include <unistd.h>
1.49 markus 66:
67: #include <openssl/evp.h>
1.72 markus 68: #include <openssl/err.h>
1.1 deraadt 69:
1.293 deraadt 70: #include "xmalloc.h"
1.84 markus 71: #include "ssh.h"
72: #include "ssh1.h"
73: #include "ssh2.h"
1.341 djm 74: #include "canohost.h"
1.84 markus 75: #include "compat.h"
76: #include "cipher.h"
1.1 deraadt 77: #include "packet.h"
78: #include "buffer.h"
1.123 markus 79: #include "channels.h"
1.49 markus 80: #include "key.h"
1.58 markus 81: #include "authfd.h"
1.49 markus 82: #include "authfile.h"
1.83 markus 83: #include "pathnames.h"
1.214 djm 84: #include "dispatch.h"
1.81 markus 85: #include "clientloop.h"
1.84 markus 86: #include "log.h"
87: #include "readconf.h"
88: #include "sshconnect.h"
89: #include "misc.h"
1.95 markus 90: #include "kex.h"
91: #include "mac.h"
1.213 deraadt 92: #include "sshpty.h"
1.212 djm 93: #include "match.h"
1.214 djm 94: #include "msg.h"
1.225 dtucker 95: #include "uidswap.h"
1.327 andreas 96: #include "roaming.h"
1.278 stevesk 97: #include "version.h"
1.49 markus 98:
1.333 markus 99: #ifdef ENABLE_PKCS11
100: #include "ssh-pkcs11.h"
1.137 jakob 101: #endif
1.127 markus 102:
1.49 markus 103: extern char *__progname;
1.1 deraadt 104:
1.316 djm 105: /* Flag indicating whether debug mode is on. May be set on the command line. */
1.1 deraadt 106: int debug_flag = 0;
107:
1.359 djm 108: /* Flag indicating whether a tty should be requested */
1.1 deraadt 109: int tty_flag = 0;
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: /*
1.344 djm 121: * Flag indicating that the current process should be backgrounded and
122: * a new slave launched in the foreground for ControlPersist.
123: */
124: int need_controlpersist_detach = 0;
125:
126: /* Copies of flags for ControlPersist foreground slave */
1.359 djm 127: int ostdin_null_flag, ono_shell_flag, otty_flag, orequest_tty;
1.344 djm 128:
129: /*
1.33 markus 130: * Flag indicating that ssh should fork after authentication. This is useful
1.172 deraadt 131: * so that the passphrase can be entered manually, and then ssh goes to the
1.33 markus 132: * background.
133: */
1.1 deraadt 134: int fork_after_authentication_flag = 0;
135:
1.331 dtucker 136: /* forward stdio to remote host and port */
137: char *stdio_forward_host = NULL;
138: int stdio_forward_port = 0;
139:
1.33 markus 140: /*
141: * General data structure for command line options and options configurable
142: * in configuration files. See readconf.h.
143: */
1.1 deraadt 144: Options options;
145:
1.139 markus 146: /* optional user configfile */
147: char *config = NULL;
148:
1.33 markus 149: /*
150: * Name of the host we are connecting to. This is the name given on the
151: * command line, or the HostName specified for the user-supplied name in a
152: * configuration file.
153: */
1.1 deraadt 154: char *host;
155:
1.22 provos 156: /* socket address the host resolves to */
1.37 markus 157: struct sockaddr_storage hostaddr;
1.1 deraadt 158:
1.112 markus 159: /* Private host keys. */
1.173 markus 160: Sensitive sensitive_data;
1.1 deraadt 161:
1.10 dugsong 162: /* Original real UID. */
163: uid_t original_real_uid;
1.177 markus 164: uid_t original_effective_uid;
1.1 deraadt 165:
1.45 markus 166: /* command to be executed */
167: Buffer command;
168:
1.85 djm 169: /* Should we execute a command or invoke a subsystem? */
170: int subsystem_flag = 0;
171:
1.170 markus 172: /* # of replies received for global requests */
1.315 djm 173: static int remote_forward_confirms_received = 0;
1.170 markus 174:
1.313 djm 175: /* mux.c */
176: extern int muxserver_sock;
177: extern u_int muxclient_command;
178:
1.186 djm 179:
1.1 deraadt 180: /* Prints a help message to the user. This function never returns. */
181:
1.126 itojun 182: static void
1.93 itojun 183: usage(void)
1.1 deraadt 184: {
1.208 markus 185: fprintf(stderr,
1.321 jmc 186: "usage: ssh [-1246AaCfgKkMNnqsTtVvXxYy] [-b bind_address] [-c cipher_spec]\n"
1.375 dtucker 187: " [-D [bind_address:]port] [-E log_file] [-e escape_char]\n"
188: " [-F configfile] [-I pkcs11] [-i identity_file]\n"
1.377 ! djm 189: " [-L [bind_address:]port:host:hostport] [-Q protocol_feature]\n"
1.232 djm 190: " [-l login_name] [-m mac_spec] [-O ctl_cmd] [-o option] [-p port]\n"
1.233 jmc 191: " [-R [bind_address:]port:host:hostport] [-S ctl_path]\n"
1.331 dtucker 192: " [-W host:port] [-w local_tun[:remote_tun]]\n"
193: " [user@]hostname [command]\n"
1.208 markus 194: );
1.257 dtucker 195: exit(255);
1.1 deraadt 196: }
197:
1.126 itojun 198: static int ssh_session(void);
199: static int ssh_session2(void);
200: static void load_public_identity_files(void);
1.352 djm 201: static void main_sigchld_handler(int);
1.312 djm 202:
203: /* from muxclient.c */
204: void muxclient(const char *);
205: void muxserver_listen(void);
1.45 markus 206:
1.361 djm 207: /* ~/ expand a list of paths. NB. assumes path[n] is heap-allocated. */
208: static void
209: tilde_expand_paths(char **paths, u_int num_paths)
210: {
211: u_int i;
212: char *cp;
213:
214: for (i = 0; i < num_paths; i++) {
215: cp = tilde_expand_filename(paths[i], original_real_uid);
216: xfree(paths[i]);
217: paths[i] = cp;
218: }
219: }
220:
1.32 deraadt 221: /*
222: * Main program for the ssh client.
223: */
1.2 provos 224: int
225: main(int ac, char **av)
1.1 deraadt 226: {
1.326 dtucker 227: int i, r, opt, exit_status, use_syslog;
1.375 dtucker 228: char *p, *cp, *line, *argv0, buf[MAXPATHLEN], *host_arg, *logfile;
1.358 djm 229: char thishost[NI_MAXHOST], shorthost[NI_MAXHOST], portstr[NI_MAXSERV];
1.31 markus 230: struct stat st;
1.98 markus 231: struct passwd *pw;
1.303 djm 232: int dummy, timeout_ms;
1.144 stevesk 233: extern int optind, optreset;
234: extern char *optarg;
1.244 djm 235: struct servent *sp;
1.232 djm 236: Forward fwd;
1.250 djm 237:
238: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
239: sanitise_stdfd();
1.31 markus 240:
1.33 markus 241: /*
1.346 djm 242: * Discard other fds that are hanging around. These can cause problem
243: * with backgrounded ssh processes started by ControlPersist.
244: */
245: closefrom(STDERR_FILENO + 1);
246:
247: /*
1.33 markus 248: * Save the original real uid. It will be needed later (uid-swapping
249: * may clobber the real uid).
250: */
1.31 markus 251: original_real_uid = getuid();
252: original_effective_uid = geteuid();
253:
1.184 stevesk 254: /*
255: * Use uid-swapping to give up root privileges for the duration of
256: * option processing. We will re-instantiate the rights when we are
257: * ready to create the privileged port, and will permanently drop
258: * them when the port has been created (actually, when the connection
259: * has been made, as we may need to create the port several times).
260: */
261: PRIV_END;
262:
1.31 markus 263: /* If we are installed setuid root be careful to not drop core. */
264: if (original_real_uid != original_effective_uid) {
265: struct rlimit rlim;
266: rlim.rlim_cur = rlim.rlim_max = 0;
267: if (setrlimit(RLIMIT_CORE, &rlim) < 0)
268: fatal("setrlimit failed: %.100s", strerror(errno));
1.1 deraadt 269: }
1.107 markus 270: /* Get user data. */
271: pw = getpwuid(original_real_uid);
272: if (!pw) {
1.191 itojun 273: logit("You don't exist, go away!");
1.257 dtucker 274: exit(255);
1.107 markus 275: }
276: /* Take a copy of the returned structure. */
277: pw = pwcopy(pw);
1.31 markus 278:
1.33 markus 279: /*
280: * Set our umask to something reasonable, as some files are created
281: * with the default umask. This will make them world-readable but
282: * writable only by the owner, which is ok for all files for which we
283: * don't set the modes explicitly.
284: */
1.31 markus 285: umask(022);
286:
1.316 djm 287: /*
288: * Initialize option structure to indicate that no values have been
289: * set.
290: */
1.31 markus 291: initialize_options(&options);
292:
293: /* Parse command-line arguments. */
294: host = NULL;
1.320 djm 295: use_syslog = 0;
1.375 dtucker 296: logfile = NULL;
1.325 markus 297: argv0 = av[0];
1.31 markus 298:
1.266 djm 299: again:
1.316 djm 300: while ((opt = getopt(ac, av, "1246ab:c:e:fgi:kl:m:no:p:qstvx"
1.376 djm 301: "ACD:E:F:I:KL:MNO:PQ:R:S:TVw:W:XYy")) != -1) {
1.31 markus 302: switch (opt) {
1.91 jakob 303: case '1':
304: options.protocol = SSH_PROTO_1;
305: break;
1.47 markus 306: case '2':
307: options.protocol = SSH_PROTO_2;
308: break;
1.37 markus 309: case '4':
1.196 djm 310: options.address_family = AF_INET;
1.37 markus 311: break;
312: case '6':
1.196 djm 313: options.address_family = AF_INET6;
1.37 markus 314: break;
1.31 markus 315: case 'n':
316: stdin_null_flag = 1;
317: break;
318: case 'f':
319: fork_after_authentication_flag = 1;
320: stdin_null_flag = 1;
321: break;
322: case 'x':
323: options.forward_x11 = 0;
324: break;
325: case 'X':
326: options.forward_x11 = 1;
327: break;
1.320 djm 328: case 'y':
329: use_syslog = 1;
330: break;
1.375 dtucker 331: case 'E':
332: logfile = xstrdup(optarg);
333: break;
1.202 markus 334: case 'Y':
335: options.forward_x11 = 1;
336: options.forward_x11_trusted = 1;
337: break;
1.31 markus 338: case 'g':
339: options.gateway_ports = 1;
340: break;
1.229 djm 341: case 'O':
1.332 djm 342: if (stdio_forward_host != NULL)
343: fatal("Cannot specify multiplexing "
344: "command with -W");
345: else if (muxclient_command != 0)
346: fatal("Multiplexing command already specified");
1.229 djm 347: if (strcmp(optarg, "check") == 0)
1.312 djm 348: muxclient_command = SSHMUX_COMMAND_ALIVE_CHECK;
1.338 markus 349: else if (strcmp(optarg, "forward") == 0)
350: muxclient_command = SSHMUX_COMMAND_FORWARD;
1.229 djm 351: else if (strcmp(optarg, "exit") == 0)
1.312 djm 352: muxclient_command = SSHMUX_COMMAND_TERMINATE;
1.357 djm 353: else if (strcmp(optarg, "stop") == 0)
354: muxclient_command = SSHMUX_COMMAND_STOP;
1.365 djm 355: else if (strcmp(optarg, "cancel") == 0)
356: muxclient_command = SSHMUX_COMMAND_CANCEL_FWD;
1.229 djm 357: else
358: fatal("Invalid multiplex command.");
359: break;
1.183 stevesk 360: case 'P': /* deprecated */
1.31 markus 361: options.use_privileged_port = 0;
1.376 djm 362: break;
363: case 'Q': /* deprecated */
364: cp = NULL;
365: if (strcasecmp(optarg, "cipher") == 0)
366: cp = cipher_alg_list();
367: else if (strcasecmp(optarg, "mac") == 0)
368: cp = mac_alg_list();
369: else if (strcasecmp(optarg, "kex") == 0)
370: cp = kex_alg_list();
371: else if (strcasecmp(optarg, "key") == 0)
372: cp = key_alg_list();
373: if (cp == NULL)
374: fatal("Unsupported query \"%s\"", optarg);
375: printf("%s\n", cp);
376: free(cp);
377: exit(0);
1.31 markus 378: break;
379: case 'a':
380: options.forward_agent = 0;
1.53 markus 381: break;
382: case 'A':
383: options.forward_agent = 1;
1.31 markus 384: break;
385: case 'k':
1.204 dtucker 386: options.gss_deleg_creds = 0;
1.297 djm 387: break;
388: case 'K':
389: options.gss_authentication = 1;
390: options.gss_deleg_creds = 1;
1.31 markus 391: break;
392: case 'i':
393: if (stat(optarg, &st) < 0) {
1.128 fgsch 394: fprintf(stderr, "Warning: Identity file %s "
1.231 otto 395: "not accessible: %s.\n", optarg,
396: strerror(errno));
1.31 markus 397: break;
398: }
1.371 dtucker 399: add_identity_file(&options, NULL, optarg, 1);
1.31 markus 400: break;
1.127 markus 401: case 'I':
1.333 markus 402: #ifdef ENABLE_PKCS11
403: options.pkcs11_provider = xstrdup(optarg);
1.137 jakob 404: #else
1.333 markus 405: fprintf(stderr, "no support for PKCS#11.\n");
1.137 jakob 406: #endif
1.127 markus 407: break;
1.31 markus 408: case 't':
1.359 djm 409: if (options.request_tty == REQUEST_TTY_YES)
410: options.request_tty = REQUEST_TTY_FORCE;
411: else
412: options.request_tty = REQUEST_TTY_YES;
1.31 markus 413: break;
414: case 'v':
1.197 markus 415: if (debug_flag == 0) {
1.66 markus 416: debug_flag = 1;
417: options.log_level = SYSLOG_LEVEL_DEBUG1;
1.197 markus 418: } else {
419: if (options.log_level < SYSLOG_LEVEL_DEBUG3)
420: options.log_level++;
421: }
1.375 dtucker 422: break;
1.31 markus 423: case 'V':
1.209 markus 424: fprintf(stderr, "%s, %s\n",
425: SSH_VERSION, SSLeay_version(SSLEAY_VERSION));
1.31 markus 426: if (opt == 'V')
427: exit(0);
428: break;
1.255 reyk 429: case 'w':
1.256 reyk 430: if (options.tun_open == -1)
431: options.tun_open = SSH_TUNMODE_DEFAULT;
1.255 reyk 432: options.tun_local = a2tun(optarg, &options.tun_remote);
1.256 reyk 433: if (options.tun_local == SSH_TUNID_ERR) {
1.316 djm 434: fprintf(stderr,
435: "Bad tun device '%s'\n", optarg);
1.257 dtucker 436: exit(255);
1.255 reyk 437: }
438: break;
1.331 dtucker 439: case 'W':
1.332 djm 440: if (stdio_forward_host != NULL)
441: fatal("stdio forward already specified");
442: if (muxclient_command != 0)
443: fatal("Cannot specify stdio forward with -O");
1.331 dtucker 444: if (parse_forward(&fwd, optarg, 1, 0)) {
445: stdio_forward_host = fwd.listen_host;
446: stdio_forward_port = fwd.listen_port;
447: xfree(fwd.connect_host);
448: } else {
449: fprintf(stderr,
450: "Bad stdio forwarding specification '%s'\n",
451: optarg);
452: exit(255);
453: }
1.359 djm 454: options.request_tty = REQUEST_TTY_NO;
1.331 dtucker 455: no_shell_flag = 1;
456: options.clear_forwardings = 1;
457: options.exit_on_forward_failure = 1;
458: break;
1.31 markus 459: case 'q':
460: options.log_level = SYSLOG_LEVEL_QUIET;
461: break;
462: case 'e':
463: if (optarg[0] == '^' && optarg[2] == 0 &&
1.128 fgsch 464: (u_char) optarg[1] >= 64 &&
465: (u_char) optarg[1] < 128)
1.78 markus 466: options.escape_char = (u_char) optarg[1] & 31;
1.31 markus 467: else if (strlen(optarg) == 1)
1.78 markus 468: options.escape_char = (u_char) optarg[0];
1.31 markus 469: else if (strcmp(optarg, "none") == 0)
1.119 stevesk 470: options.escape_char = SSH_ESCAPECHAR_NONE;
1.31 markus 471: else {
1.128 fgsch 472: fprintf(stderr, "Bad escape character '%s'.\n",
473: optarg);
1.257 dtucker 474: exit(255);
1.31 markus 475: }
476: break;
477: case 'c':
1.49 markus 478: if (ciphers_valid(optarg)) {
479: /* SSH2 only */
480: options.ciphers = xstrdup(optarg);
1.224 markus 481: options.cipher = SSH_CIPHER_INVALID;
1.49 markus 482: } else {
483: /* SSH1 only */
1.74 markus 484: options.cipher = cipher_number(optarg);
485: if (options.cipher == -1) {
1.128 fgsch 486: fprintf(stderr,
487: "Unknown cipher type '%s'\n",
488: optarg);
1.257 dtucker 489: exit(255);
1.49 markus 490: }
1.128 fgsch 491: if (options.cipher == SSH_CIPHER_3DES)
1.74 markus 492: options.ciphers = "3des-cbc";
1.128 fgsch 493: else if (options.cipher == SSH_CIPHER_BLOWFISH)
1.74 markus 494: options.ciphers = "blowfish-cbc";
1.128 fgsch 495: else
1.74 markus 496: options.ciphers = (char *)-1;
1.95 markus 497: }
498: break;
499: case 'm':
500: if (mac_valid(optarg))
501: options.macs = xstrdup(optarg);
502: else {
1.128 fgsch 503: fprintf(stderr, "Unknown mac type '%s'\n",
504: optarg);
1.257 dtucker 505: exit(255);
1.31 markus 506: }
507: break;
1.214 djm 508: case 'M':
1.242 djm 509: if (options.control_master == SSHCTL_MASTER_YES)
510: options.control_master = SSHCTL_MASTER_ASK;
511: else
512: options.control_master = SSHCTL_MASTER_YES;
1.214 djm 513: break;
1.31 markus 514: case 'p':
1.113 stevesk 515: options.port = a2port(optarg);
1.323 djm 516: if (options.port <= 0) {
1.109 markus 517: fprintf(stderr, "Bad port '%s'\n", optarg);
1.257 dtucker 518: exit(255);
1.109 markus 519: }
1.31 markus 520: break;
521: case 'l':
522: options.user = optarg;
523: break;
1.141 stevesk 524:
525: case 'L':
1.324 djm 526: if (parse_forward(&fwd, optarg, 0, 0))
1.232 djm 527: add_local_forward(&options, &fwd);
528: else {
1.128 fgsch 529: fprintf(stderr,
1.232 djm 530: "Bad local forwarding specification '%s'\n",
1.128 fgsch 531: optarg);
1.257 dtucker 532: exit(255);
1.31 markus 533: }
1.232 djm 534: break;
535:
536: case 'R':
1.324 djm 537: if (parse_forward(&fwd, optarg, 0, 1)) {
1.232 djm 538: add_remote_forward(&options, &fwd);
539: } else {
1.128 fgsch 540: fprintf(stderr,
1.232 djm 541: "Bad remote forwarding specification "
542: "'%s'\n", optarg);
1.257 dtucker 543: exit(255);
1.31 markus 544: }
545: break;
1.108 markus 546:
547: case 'D':
1.324 djm 548: if (parse_forward(&fwd, optarg, 1, 0)) {
1.322 stevesk 549: add_local_forward(&options, &fwd);
1.232 djm 550: } else {
1.322 stevesk 551: fprintf(stderr,
552: "Bad dynamic forwarding specification "
553: "'%s'\n", optarg);
1.257 dtucker 554: exit(255);
1.109 markus 555: }
1.108 markus 556: break;
557:
1.31 markus 558: case 'C':
559: options.compression = 1;
560: break;
1.45 markus 561: case 'N':
562: no_shell_flag = 1;
1.359 djm 563: options.request_tty = REQUEST_TTY_NO;
1.45 markus 564: break;
565: case 'T':
1.359 djm 566: options.request_tty = REQUEST_TTY_NO;
1.45 markus 567: break;
1.31 markus 568: case 'o':
569: dummy = 1;
1.205 markus 570: line = xstrdup(optarg);
1.128 fgsch 571: if (process_config_line(&options, host ? host : "",
1.372 dtucker 572: line, "command-line", 0, &dummy, SSHCONF_USERCONF)
573: != 0)
1.257 dtucker 574: exit(255);
1.205 markus 575: xfree(line);
1.31 markus 576: break;
1.85 djm 577: case 's':
578: subsystem_flag = 1;
1.117 markus 579: break;
1.214 djm 580: case 'S':
581: if (options.control_path != NULL)
582: free(options.control_path);
583: options.control_path = xstrdup(optarg);
584: break;
1.117 markus 585: case 'b':
586: options.bind_address = optarg;
1.85 djm 587: break;
1.139 markus 588: case 'F':
589: config = optarg;
590: break;
1.31 markus 591: default:
592: usage();
1.1 deraadt 593: }
1.31 markus 594: }
595:
1.128 fgsch 596: ac -= optind;
597: av += optind;
598:
1.329 guenther 599: if (ac > 0 && !host) {
1.188 markus 600: if (strrchr(*av, '@')) {
1.128 fgsch 601: p = xstrdup(*av);
1.188 markus 602: cp = strrchr(p, '@');
1.128 fgsch 603: if (cp == NULL || cp == p)
604: usage();
605: options.user = p;
606: *cp = '\0';
607: host = ++cp;
608: } else
609: host = *av;
1.189 millert 610: if (ac > 1) {
611: optind = optreset = 1;
1.128 fgsch 612: goto again;
613: }
1.189 millert 614: ac--, av++;
1.128 fgsch 615: }
616:
1.31 markus 617: /* Check that we got a host name. */
618: if (!host)
619: usage();
620:
1.350 djm 621: OpenSSL_add_all_algorithms();
1.72 markus 622: ERR_load_crypto_strings();
1.31 markus 623:
624: /* Initialize the command to execute on remote host. */
625: buffer_init(&command);
1.1 deraadt 626:
1.33 markus 627: /*
628: * Save the command to execute on the remote host in a buffer. There
629: * is no limit on the length of the command, except by the maximum
630: * packet size. Also sets the tty flag if there is no command.
631: */
1.128 fgsch 632: if (!ac) {
1.31 markus 633: /* No command specified - execute shell on a tty. */
1.85 djm 634: if (subsystem_flag) {
1.128 fgsch 635: fprintf(stderr,
636: "You must specify a subsystem to invoke.\n");
1.85 djm 637: usage();
638: }
1.31 markus 639: } else {
1.128 fgsch 640: /* A command has been specified. Store it into the buffer. */
641: for (i = 0; i < ac; i++) {
642: if (i)
1.31 markus 643: buffer_append(&command, " ", 1);
644: buffer_append(&command, av[i], strlen(av[i]));
645: }
646: }
647:
648: /* Cannot fork to background if no command. */
1.316 djm 649: if (fork_after_authentication_flag && buffer_len(&command) == 0 &&
650: !no_shell_flag)
651: fatal("Cannot fork into background without a command "
652: "to execute.");
1.31 markus 653:
1.101 markus 654: /*
655: * Initialize "log" output. Since we are the client all output
1.375 dtucker 656: * goes to stderr unless otherwise specified by -y or -E.
1.101 markus 657: */
1.375 dtucker 658: if (use_syslog && logfile != NULL)
659: fatal("Can't specify both -y and -E");
660: if (logfile != NULL) {
661: log_redirect_stderr_to(logfile);
662: xfree(logfile);
663: }
1.325 markus 664: log_init(argv0,
1.316 djm 665: options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level,
1.320 djm 666: SYSLOG_FACILITY_USER, !use_syslog);
1.375 dtucker 667:
668: if (debug_flag)
669: logit("%s, %s", SSH_VERSION, SSLeay_version(SSLEAY_VERSION));
1.31 markus 670:
1.139 markus 671: /*
672: * Read per-user configuration file. Ignore the system wide config
673: * file if the user specifies a config file on the command line.
674: */
675: if (config != NULL) {
1.374 djm 676: if (strcasecmp(config, "none") != 0 &&
677: !read_config_file(config, host, &options, SSHCONF_USERCONF))
1.142 stevesk 678: fatal("Can't open user config file %.100s: "
679: "%.100s", config, strerror(errno));
1.295 stevesk 680: } else {
1.326 dtucker 681: r = snprintf(buf, sizeof buf, "%s/%s", pw->pw_dir,
1.139 markus 682: _PATH_SSH_USER_CONFFILE);
1.326 dtucker 683: if (r > 0 && (size_t)r < sizeof(buf))
1.372 dtucker 684: (void)read_config_file(buf, host, &options,
685: SSHCONF_CHECKPERM|SSHCONF_USERCONF);
1.139 markus 686:
1.364 djm 687: /* Read systemwide configuration file after user config. */
1.223 deraadt 688: (void)read_config_file(_PATH_HOST_CONFIG_FILE, host,
1.210 djm 689: &options, 0);
1.139 markus 690: }
1.31 markus 691:
692: /* Fill configuration defaults. */
693: fill_default_options(&options);
694:
1.196 djm 695: channel_set_af(options.address_family);
696:
1.31 markus 697: /* reinit */
1.325 markus 698: log_init(argv0, options.log_level, SYSLOG_FACILITY_USER, !use_syslog);
1.370 djm 699:
700: if (options.request_tty == REQUEST_TTY_YES ||
701: options.request_tty == REQUEST_TTY_FORCE)
702: tty_flag = 1;
703:
704: /* Allocate a tty by default if no command specified. */
705: if (buffer_len(&command) == 0)
706: tty_flag = options.request_tty != REQUEST_TTY_NO;
707:
708: /* Force no tty */
709: if (options.request_tty == REQUEST_TTY_NO || muxclient_command != 0)
710: tty_flag = 0;
711: /* Do not allocate a tty if stdin is not a tty. */
712: if ((!isatty(fileno(stdin)) || stdin_null_flag) &&
713: options.request_tty != REQUEST_TTY_FORCE) {
714: if (tty_flag)
715: logit("Pseudo-terminal will not be allocated because "
716: "stdin is not a terminal.");
717: tty_flag = 0;
718: }
1.31 markus 719:
720: if (options.user == NULL)
721: options.user = xstrdup(pw->pw_name);
722:
1.317 dtucker 723: /* Get default port if port has not been set. */
724: if (options.port == 0) {
725: sp = getservbyname(SSH_SERVICE_NAME, "tcp");
726: options.port = sp ? ntohs(sp->s_port) : SSH_DEFAULT_PORT;
727: }
728:
1.356 djm 729: /* preserve host name given on command line for %n expansion */
730: host_arg = host;
1.343 djm 731: if (options.hostname != NULL) {
732: host = percent_expand(options.hostname,
733: "h", host, (char *)NULL);
734: }
735:
1.358 djm 736: if (gethostname(thishost, sizeof(thishost)) == -1)
737: fatal("gethostname: %s", strerror(errno));
738: strlcpy(shorthost, thishost, sizeof(shorthost));
739: shorthost[strcspn(thishost, ".")] = '\0';
740: snprintf(portstr, sizeof(portstr), "%d", options.port);
741:
1.317 dtucker 742: if (options.local_command != NULL) {
743: debug3("expanding LocalCommand: %s", options.local_command);
744: cp = options.local_command;
745: options.local_command = percent_expand(cp, "d", pw->pw_dir,
1.356 djm 746: "h", host, "l", thishost, "n", host_arg, "r", options.user,
1.358 djm 747: "p", portstr, "u", pw->pw_name, "L", shorthost,
748: (char *)NULL);
1.317 dtucker 749: debug3("expanded LocalCommand: %s", options.local_command);
750: xfree(cp);
751: }
1.195 markus 752:
753: /* force lowercase for hostkey matching */
754: if (options.host_key_alias != NULL) {
755: for (p = options.host_key_alias; *p; p++)
756: if (isupper(*p))
1.271 deraadt 757: *p = (char)tolower(*p);
1.246 djm 758: }
759:
1.190 markus 760: if (options.proxy_command != NULL &&
1.304 dtucker 761: strcmp(options.proxy_command, "none") == 0) {
762: xfree(options.proxy_command);
1.190 markus 763: options.proxy_command = NULL;
1.304 dtucker 764: }
1.245 djm 765: if (options.control_path != NULL &&
1.304 dtucker 766: strcmp(options.control_path, "none") == 0) {
767: xfree(options.control_path);
1.245 djm 768: options.control_path = NULL;
1.304 dtucker 769: }
1.31 markus 770:
1.214 djm 771: if (options.control_path != NULL) {
1.241 djm 772: cp = tilde_expand_filename(options.control_path,
773: original_real_uid);
1.304 dtucker 774: xfree(options.control_path);
1.358 djm 775: options.control_path = percent_expand(cp, "h", host,
776: "l", thishost, "n", host_arg, "r", options.user,
777: "p", portstr, "u", pw->pw_name, "L", shorthost,
778: (char *)NULL);
1.241 djm 779: xfree(cp);
1.214 djm 780: }
1.312 djm 781: if (muxclient_command != 0 && options.control_path == NULL)
1.240 djm 782: fatal("No ControlPath specified for \"-O\" command");
1.242 djm 783: if (options.control_path != NULL)
1.312 djm 784: muxclient(options.control_path);
1.214 djm 785:
1.303 djm 786: timeout_ms = options.connection_timeout * 1000;
787:
1.77 markus 788: /* Open a connection to the remote host. */
1.203 djm 789: if (ssh_connect(host, &hostaddr, options.port,
1.303 djm 790: options.address_family, options.connection_attempts, &timeout_ms,
791: options.tcp_keep_alive,
1.177 markus 792: original_effective_uid == 0 && options.use_privileged_port,
1.179 markus 793: options.proxy_command) != 0)
1.257 dtucker 794: exit(255);
1.31 markus 795:
1.303 djm 796: if (timeout_ms > 0)
797: debug3("timeout: %d ms remain after connect", timeout_ms);
798:
1.33 markus 799: /*
800: * If we successfully made the connection, load the host private key
801: * in case we will need it later for combined rsa-rhosts
802: * authentication. This must be done before releasing extra
803: * privileges, because the file is only readable by root.
1.174 markus 804: * If we cannot access the private keys, load the public keys
805: * instead and try to execute the ssh-keysign helper instead.
1.33 markus 806: */
1.112 markus 807: sensitive_data.nkeys = 0;
808: sensitive_data.keys = NULL;
1.173 markus 809: sensitive_data.external_keysign = 0;
1.178 markus 810: if (options.rhosts_rsa_authentication ||
811: options.hostbased_authentication) {
1.349 djm 812: sensitive_data.nkeys = 7;
1.274 deraadt 813: sensitive_data.keys = xcalloc(sensitive_data.nkeys,
1.180 deraadt 814: sizeof(Key));
1.177 markus 815:
816: PRIV_START;
1.112 markus 817: sensitive_data.keys[0] = key_load_private_type(KEY_RSA1,
1.276 dtucker 818: _PATH_HOST_KEY_FILE, "", NULL, NULL);
1.345 djm 819: sensitive_data.keys[1] = key_load_private_cert(KEY_DSA,
820: _PATH_HOST_DSA_KEY_FILE, "", NULL);
1.349 djm 821: sensitive_data.keys[2] = key_load_private_cert(KEY_ECDSA,
822: _PATH_HOST_ECDSA_KEY_FILE, "", NULL);
823: sensitive_data.keys[3] = key_load_private_cert(KEY_RSA,
1.345 djm 824: _PATH_HOST_RSA_KEY_FILE, "", NULL);
1.349 djm 825: sensitive_data.keys[4] = key_load_private_type(KEY_DSA,
1.276 dtucker 826: _PATH_HOST_DSA_KEY_FILE, "", NULL, NULL);
1.349 djm 827: sensitive_data.keys[5] = key_load_private_type(KEY_ECDSA,
828: _PATH_HOST_ECDSA_KEY_FILE, "", NULL, NULL);
829: sensitive_data.keys[6] = key_load_private_type(KEY_RSA,
1.276 dtucker 830: _PATH_HOST_RSA_KEY_FILE, "", NULL, NULL);
1.177 markus 831: PRIV_END;
1.173 markus 832:
1.181 markus 833: if (options.hostbased_authentication == 1 &&
834: sensitive_data.keys[0] == NULL &&
1.349 djm 835: sensitive_data.keys[4] == NULL &&
836: sensitive_data.keys[5] == NULL &&
837: sensitive_data.keys[6] == NULL) {
1.345 djm 838: sensitive_data.keys[1] = key_load_cert(
839: _PATH_HOST_DSA_KEY_FILE);
840: sensitive_data.keys[2] = key_load_cert(
1.349 djm 841: _PATH_HOST_ECDSA_KEY_FILE);
842: sensitive_data.keys[3] = key_load_cert(
1.345 djm 843: _PATH_HOST_RSA_KEY_FILE);
1.349 djm 844: sensitive_data.keys[4] = key_load_public(
1.173 markus 845: _PATH_HOST_DSA_KEY_FILE, NULL);
1.349 djm 846: sensitive_data.keys[5] = key_load_public(
847: _PATH_HOST_ECDSA_KEY_FILE, NULL);
848: sensitive_data.keys[6] = key_load_public(
1.173 markus 849: _PATH_HOST_RSA_KEY_FILE, NULL);
850: sensitive_data.external_keysign = 1;
851: }
1.31 markus 852: }
1.33 markus 853: /*
854: * Get rid of any extra privileges that we may have. We will no
855: * longer need them. Also, extra privileges could make it very hard
856: * to read identity files and other non-world-readable files from the
857: * user's home directory if it happens to be on a NFS volume where
858: * root is mapped to nobody.
859: */
1.225 dtucker 860: if (original_effective_uid == 0) {
861: PRIV_START;
862: permanently_set_uid(pw);
863: }
1.31 markus 864:
1.33 markus 865: /*
866: * Now that we are back to our own permissions, create ~/.ssh
1.254 djm 867: * directory if it doesn't already exist.
1.33 markus 868: */
1.367 djm 869: if (config == NULL) {
870: r = snprintf(buf, sizeof buf, "%s%s%s", pw->pw_dir,
871: strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR);
872: if (r > 0 && (size_t)r < sizeof(buf) && stat(buf, &st) < 0)
873: if (mkdir(buf, 0700) < 0)
874: error("Could not create directory '%.200s'.",
875: buf);
876: }
1.31 markus 877:
1.104 markus 878: /* load options.identity_files */
879: load_public_identity_files();
880:
881: /* Expand ~ in known host file names. */
1.361 djm 882: tilde_expand_paths(options.system_hostfiles,
883: options.num_system_hostfiles);
884: tilde_expand_paths(options.user_hostfiles, options.num_user_hostfiles);
1.149 markus 885:
886: signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
1.352 djm 887: signal(SIGCHLD, main_sigchld_handler);
1.31 markus 888:
1.316 djm 889: /* Log into the remote system. Never returns if the login fails. */
1.303 djm 890: ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr,
1.355 djm 891: options.port, pw, timeout_ms);
1.339 djm 892:
893: if (packet_connection_is_on_socket()) {
894: verbose("Authenticated to %s ([%s]:%d).", host,
895: get_remote_ipaddr(), get_remote_port());
896: } else {
897: verbose("Authenticated to %s (via proxy).", host);
898: }
1.31 markus 899:
1.112 markus 900: /* We no longer need the private host keys. Clear them now. */
901: if (sensitive_data.nkeys != 0) {
902: for (i = 0; i < sensitive_data.nkeys; i++) {
903: if (sensitive_data.keys[i] != NULL) {
904: /* Destroys contents safely */
905: debug3("clear hostkey %d", i);
906: key_free(sensitive_data.keys[i]);
907: sensitive_data.keys[i] = NULL;
908: }
909: }
910: xfree(sensitive_data.keys);
1.134 markus 911: }
912: for (i = 0; i < options.num_identity_files; i++) {
913: if (options.identity_files[i]) {
914: xfree(options.identity_files[i]);
915: options.identity_files[i] = NULL;
916: }
917: if (options.identity_keys[i]) {
918: key_free(options.identity_keys[i]);
919: options.identity_keys[i] = NULL;
920: }
1.112 markus 921: }
1.31 markus 922:
1.45 markus 923: exit_status = compat20 ? ssh_session2() : ssh_session();
924: packet_close();
1.186 djm 925:
1.312 djm 926: if (options.control_path != NULL && muxserver_sock != -1)
1.214 djm 927: unlink(options.control_path);
928:
1.353 djm 929: /* Kill ProxyCommand if it is running. */
930: ssh_kill_proxy_command();
1.186 djm 931:
1.45 markus 932: return exit_status;
933: }
934:
1.344 djm 935: static void
936: control_persist_detach(void)
937: {
938: pid_t pid;
1.346 djm 939: int devnull;
1.344 djm 940:
941: debug("%s: backgrounding master process", __func__);
942:
943: /*
944: * master (current process) into the background, and make the
945: * foreground process a client of the backgrounded master.
946: */
947: switch ((pid = fork())) {
948: case -1:
949: fatal("%s: fork: %s", __func__, strerror(errno));
950: case 0:
951: /* Child: master process continues mainloop */
952: break;
953: default:
954: /* Parent: set up mux slave to connect to backgrounded master */
955: debug2("%s: background process is %ld", __func__, (long)pid);
956: stdin_null_flag = ostdin_null_flag;
1.359 djm 957: options.request_tty = orequest_tty;
1.344 djm 958: tty_flag = otty_flag;
959: close(muxserver_sock);
960: muxserver_sock = -1;
1.351 markus 961: options.control_master = SSHCTL_MASTER_NO;
1.344 djm 962: muxclient(options.control_path);
963: /* muxclient() doesn't return on success. */
964: fatal("Failed to connect to new control master");
965: }
1.346 djm 966: if ((devnull = open(_PATH_DEVNULL, O_RDWR)) == -1) {
967: error("%s: open(\"/dev/null\"): %s", __func__,
968: strerror(errno));
969: } else {
970: if (dup2(devnull, STDIN_FILENO) == -1 ||
971: dup2(devnull, STDOUT_FILENO) == -1)
972: error("%s: dup2: %s", __func__, strerror(errno));
973: if (devnull > STDERR_FILENO)
974: close(devnull);
975: }
1.362 djm 976: setproctitle("%s [mux]", options.control_path);
1.344 djm 977: }
978:
979: /* Do fork() after authentication. Used by "ssh -f" */
980: static void
981: fork_postauth(void)
982: {
983: if (need_controlpersist_detach)
984: control_persist_detach();
985: debug("forking to background");
986: fork_after_authentication_flag = 0;
987: if (daemon(1, 1) < 0)
988: fatal("daemon() failed: %.200s", strerror(errno));
989: }
990:
1.315 djm 991: /* Callback for remote forward global requests */
992: static void
993: ssh_confirm_remote_forward(int type, u_int32_t seq, void *ctxt)
994: {
995: Forward *rfwd = (Forward *)ctxt;
996:
1.324 djm 997: /* XXX verbose() on failure? */
1.315 djm 998: debug("remote forward %s for: listen %d, connect %s:%d",
999: type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
1000: rfwd->listen_port, rfwd->connect_host, rfwd->connect_port);
1.366 markus 1001: if (rfwd->listen_port == 0) {
1002: if (type == SSH2_MSG_REQUEST_SUCCESS) {
1003: rfwd->allocated_port = packet_get_int();
1004: logit("Allocated port %u for remote forward to %s:%d",
1005: rfwd->allocated_port,
1006: rfwd->connect_host, rfwd->connect_port);
1007: channel_update_permitted_opens(rfwd->handle,
1008: rfwd->allocated_port);
1009: } else {
1010: channel_update_permitted_opens(rfwd->handle, -1);
1011: }
1.324 djm 1012: }
1013:
1.315 djm 1014: if (type == SSH2_MSG_REQUEST_FAILURE) {
1015: if (options.exit_on_forward_failure)
1016: fatal("Error: remote port forwarding failed for "
1017: "listen port %d", rfwd->listen_port);
1018: else
1019: logit("Warning: remote port forwarding failed for "
1020: "listen port %d", rfwd->listen_port);
1021: }
1.318 djm 1022: if (++remote_forward_confirms_received == options.num_remote_forwards) {
1.315 djm 1023: debug("All remote forwarding requests processed");
1.344 djm 1024: if (fork_after_authentication_flag)
1025: fork_postauth();
1.318 djm 1026: }
1.315 djm 1027: }
1028:
1.126 itojun 1029: static void
1.331 dtucker 1030: client_cleanup_stdio_fwd(int id, void *arg)
1031: {
1032: debug("stdio forwarding: done");
1033: cleanup_exit(0);
1034: }
1035:
1.368 djm 1036: static void
1037: ssh_init_stdio_forwarding(void)
1.331 dtucker 1038: {
1039: Channel *c;
1.332 djm 1040: int in, out;
1.331 dtucker 1041:
1.368 djm 1042: if (stdio_forward_host == NULL)
1043: return;
1044: if (!compat20)
1045: fatal("stdio forwarding require Protocol 2");
1046:
1047: debug3("%s: %s:%d", __func__, stdio_forward_host, stdio_forward_port);
1.332 djm 1048:
1.368 djm 1049: if ((in = dup(STDIN_FILENO)) < 0 ||
1050: (out = dup(STDOUT_FILENO)) < 0)
1.332 djm 1051: fatal("channel_connect_stdio_fwd: dup() in/out failed");
1.368 djm 1052: if ((c = channel_connect_stdio_fwd(stdio_forward_host,
1053: stdio_forward_port, in, out)) == NULL)
1054: fatal("%s: channel_connect_stdio_fwd failed", __func__);
1.331 dtucker 1055: channel_register_cleanup(c->self, client_cleanup_stdio_fwd, 0);
1056: }
1057:
1058: static void
1.70 markus 1059: ssh_init_forwarding(void)
1060: {
1.86 markus 1061: int success = 0;
1.70 markus 1062: int i;
1.331 dtucker 1063:
1.70 markus 1064: /* Initiate local TCP/IP port forwardings. */
1065: for (i = 0; i < options.num_local_forwards; i++) {
1.232 djm 1066: debug("Local connections to %.200s:%d forwarded to remote "
1067: "address %.200s:%d",
1.234 deraadt 1068: (options.local_forwards[i].listen_host == NULL) ?
1069: (options.gateway_ports ? "*" : "LOCALHOST") :
1.232 djm 1070: options.local_forwards[i].listen_host,
1071: options.local_forwards[i].listen_port,
1072: options.local_forwards[i].connect_host,
1073: options.local_forwards[i].connect_port);
1.158 markus 1074: success += channel_setup_local_fwd_listener(
1.232 djm 1075: options.local_forwards[i].listen_host,
1076: options.local_forwards[i].listen_port,
1077: options.local_forwards[i].connect_host,
1078: options.local_forwards[i].connect_port,
1.70 markus 1079: options.gateway_ports);
1080: }
1.283 markus 1081: if (i > 0 && success != i && options.exit_on_forward_failure)
1082: fatal("Could not request local forwarding.");
1.86 markus 1083: if (i > 0 && success == 0)
1084: error("Could not request local forwarding.");
1.70 markus 1085:
1086: /* Initiate remote TCP/IP port forwardings. */
1087: for (i = 0; i < options.num_remote_forwards; i++) {
1.232 djm 1088: debug("Remote connections from %.200s:%d forwarded to "
1089: "local address %.200s:%d",
1.248 djm 1090: (options.remote_forwards[i].listen_host == NULL) ?
1.253 djm 1091: "LOCALHOST" : options.remote_forwards[i].listen_host,
1.232 djm 1092: options.remote_forwards[i].listen_port,
1093: options.remote_forwards[i].connect_host,
1094: options.remote_forwards[i].connect_port);
1.366 markus 1095: options.remote_forwards[i].handle =
1096: channel_request_remote_forwarding(
1.232 djm 1097: options.remote_forwards[i].listen_host,
1098: options.remote_forwards[i].listen_port,
1099: options.remote_forwards[i].connect_host,
1.366 markus 1100: options.remote_forwards[i].connect_port);
1101: if (options.remote_forwards[i].handle < 0) {
1.283 markus 1102: if (options.exit_on_forward_failure)
1103: fatal("Could not request remote forwarding.");
1104: else
1105: logit("Warning: Could not request remote "
1106: "forwarding.");
1.366 markus 1107: } else {
1108: client_register_global_confirm(ssh_confirm_remote_forward,
1109: &options.remote_forwards[i]);
1.283 markus 1110: }
1.70 markus 1111: }
1.301 djm 1112:
1113: /* Initiate tunnel forwarding. */
1114: if (options.tun_open != SSH_TUNMODE_NO) {
1115: if (client_request_tun_fwd(options.tun_open,
1116: options.tun_local, options.tun_remote) == -1) {
1117: if (options.exit_on_forward_failure)
1118: fatal("Could not request tunnel forwarding.");
1119: else
1120: error("Could not request tunnel forwarding.");
1121: }
1122: }
1.70 markus 1123: }
1124:
1.126 itojun 1125: static void
1.70 markus 1126: check_agent_present(void)
1127: {
1128: if (options.forward_agent) {
1.254 djm 1129: /* Clear agent forwarding if we don't have an agent. */
1.185 stevesk 1130: if (!ssh_agent_present())
1.70 markus 1131: options.forward_agent = 0;
1132: }
1133: }
1134:
1.126 itojun 1135: static int
1.45 markus 1136: ssh_session(void)
1137: {
1138: int type;
1139: int interactive = 0;
1140: int have_tty = 0;
1141: struct winsize ws;
1142: char *cp;
1.243 djm 1143: const char *display;
1.45 markus 1144:
1.31 markus 1145: /* Enable compression if requested. */
1146: if (options.compression) {
1.316 djm 1147: debug("Requesting compression at level %d.",
1148: options.compression_level);
1.31 markus 1149:
1.316 djm 1150: if (options.compression_level < 1 ||
1151: options.compression_level > 9)
1152: fatal("Compression level must be from 1 (fast) to "
1153: "9 (slow, best).");
1.31 markus 1154:
1155: /* Send the request. */
1156: packet_start(SSH_CMSG_REQUEST_COMPRESSION);
1157: packet_put_int(options.compression_level);
1158: packet_send();
1159: packet_write_wait();
1.156 markus 1160: type = packet_read();
1.31 markus 1161: if (type == SSH_SMSG_SUCCESS)
1162: packet_start_compression(options.compression_level);
1163: else if (type == SSH_SMSG_FAILURE)
1.191 itojun 1164: logit("Warning: Remote host refused compression.");
1.31 markus 1165: else
1.316 djm 1166: packet_disconnect("Protocol error waiting for "
1167: "compression response.");
1.31 markus 1168: }
1169: /* Allocate a pseudo tty if appropriate. */
1170: if (tty_flag) {
1171: debug("Requesting pty.");
1172:
1173: /* Start the packet. */
1174: packet_start(SSH_CMSG_REQUEST_PTY);
1175:
1176: /* Store TERM in the packet. There is no limit on the
1177: length of the string. */
1178: cp = getenv("TERM");
1179: if (!cp)
1180: cp = "";
1.124 markus 1181: packet_put_cstring(cp);
1.31 markus 1182:
1183: /* Store window size in the packet. */
1184: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
1185: memset(&ws, 0, sizeof(ws));
1.269 deraadt 1186: packet_put_int((u_int)ws.ws_row);
1187: packet_put_int((u_int)ws.ws_col);
1188: packet_put_int((u_int)ws.ws_xpixel);
1189: packet_put_int((u_int)ws.ws_ypixel);
1.31 markus 1190:
1191: /* Store tty modes in the packet. */
1.115 stevesk 1192: tty_make_modes(fileno(stdin), NULL);
1.31 markus 1193:
1194: /* Send the packet, and wait for it to leave. */
1195: packet_send();
1196: packet_write_wait();
1197:
1198: /* Read response from the server. */
1.156 markus 1199: type = packet_read();
1.43 markus 1200: if (type == SSH_SMSG_SUCCESS) {
1.31 markus 1201: interactive = 1;
1.45 markus 1202: have_tty = 1;
1.43 markus 1203: } else if (type == SSH_SMSG_FAILURE)
1.316 djm 1204: logit("Warning: Remote host failed or refused to "
1205: "allocate a pseudo tty.");
1.31 markus 1206: else
1.316 djm 1207: packet_disconnect("Protocol error waiting for pty "
1208: "request response.");
1.31 markus 1209: }
1210: /* Request X11 forwarding if enabled and DISPLAY is set. */
1.243 djm 1211: display = getenv("DISPLAY");
1212: if (options.forward_x11 && display != NULL) {
1.150 stevesk 1213: char *proto, *data;
1.50 markus 1214: /* Get reasonable local authentication information. */
1.243 djm 1215: client_x11_get_proto(display, options.xauth_location,
1.340 djm 1216: options.forward_x11_trusted,
1217: options.forward_x11_timeout,
1218: &proto, &data);
1.50 markus 1219: /* Request forwarding with authentication spoofing. */
1.316 djm 1220: debug("Requesting X11 forwarding with authentication "
1221: "spoofing.");
1.363 djm 1222: x11_request_forwarding_with_spoofing(0, display, proto,
1223: data, 0);
1.31 markus 1224: /* Read response from the server. */
1.156 markus 1225: type = packet_read();
1.31 markus 1226: if (type == SSH_SMSG_SUCCESS) {
1227: interactive = 1;
1.50 markus 1228: } else if (type == SSH_SMSG_FAILURE) {
1.191 itojun 1229: logit("Warning: Remote host denied X11 forwarding.");
1.50 markus 1230: } else {
1.316 djm 1231: packet_disconnect("Protocol error waiting for X11 "
1232: "forwarding");
1.50 markus 1233: }
1.31 markus 1234: }
1235: /* Tell the packet module whether this is an interactive session. */
1.354 djm 1236: packet_set_interactive(interactive,
1237: options.ip_qos_interactive, options.ip_qos_bulk);
1.31 markus 1238:
1239: /* Request authentication agent forwarding if appropriate. */
1.70 markus 1240: check_agent_present();
1241:
1.31 markus 1242: if (options.forward_agent) {
1243: debug("Requesting authentication agent forwarding.");
1244: auth_request_forwarding();
1245:
1246: /* Read response from the server. */
1.156 markus 1247: type = packet_read();
1.155 markus 1248: packet_check_eom();
1.31 markus 1249: if (type != SSH_SMSG_SUCCESS)
1.191 itojun 1250: logit("Warning: Remote host denied authentication agent forwarding.");
1.31 markus 1251: }
1252:
1.70 markus 1253: /* Initiate port forwardings. */
1.368 djm 1254: ssh_init_stdio_forwarding();
1.70 markus 1255: ssh_init_forwarding();
1.305 dtucker 1256:
1257: /* Execute a local command */
1258: if (options.local_command != NULL &&
1259: options.permit_local_command)
1260: ssh_local_cmd(options.local_command);
1.34 markus 1261:
1.318 djm 1262: /*
1263: * If requested and we are not interested in replies to remote
1264: * forwarding requests, then let ssh continue in the background.
1265: */
1.344 djm 1266: if (fork_after_authentication_flag) {
1267: if (options.exit_on_forward_failure &&
1268: options.num_remote_forwards > 0) {
1269: debug("deferring postauth fork until remote forward "
1270: "confirmation received");
1271: } else
1272: fork_postauth();
1.318 djm 1273: }
1.31 markus 1274:
1.33 markus 1275: /*
1276: * If a command was specified on the command line, execute the
1277: * command now. Otherwise request the server to start a shell.
1278: */
1.31 markus 1279: if (buffer_len(&command) > 0) {
1280: int len = buffer_len(&command);
1281: if (len > 900)
1282: len = 900;
1.316 djm 1283: debug("Sending command: %.*s", len,
1284: (u_char *)buffer_ptr(&command));
1.31 markus 1285: packet_start(SSH_CMSG_EXEC_CMD);
1286: packet_put_string(buffer_ptr(&command), buffer_len(&command));
1287: packet_send();
1288: packet_write_wait();
1289: } else {
1290: debug("Requesting shell.");
1291: packet_start(SSH_CMSG_EXEC_SHELL);
1292: packet_send();
1293: packet_write_wait();
1294: }
1295:
1296: /* Enter the interactive session. */
1.119 stevesk 1297: return client_loop(have_tty, tty_flag ?
1298: options.escape_char : SSH_ESCAPECHAR_NONE, 0);
1.89 markus 1299: }
1300:
1.214 djm 1301: /* request pty/x11/agent/tcpfwd/shell for channel */
1302: static void
1.337 djm 1303: ssh_session2_setup(int id, int success, void *arg)
1.214 djm 1304: {
1.215 djm 1305: extern char **environ;
1.243 djm 1306: const char *display;
1307: int interactive = tty_flag;
1.337 djm 1308:
1309: if (!success)
1310: return; /* No need for error message, channels code sens one */
1.215 djm 1311:
1.248 djm 1312: display = getenv("DISPLAY");
1.243 djm 1313: if (options.forward_x11 && display != NULL) {
1.150 stevesk 1314: char *proto, *data;
1.50 markus 1315: /* Get reasonable local authentication information. */
1.243 djm 1316: client_x11_get_proto(display, options.xauth_location,
1.340 djm 1317: options.forward_x11_trusted,
1318: options.forward_x11_timeout, &proto, &data);
1.50 markus 1319: /* Request forwarding with authentication spoofing. */
1.316 djm 1320: debug("Requesting X11 forwarding with authentication "
1321: "spoofing.");
1.363 djm 1322: x11_request_forwarding_with_spoofing(id, display, proto,
1323: data, 1);
1324: client_expect_confirm(id, "X11 forwarding", CONFIRM_WARN);
1325: /* XXX exit_on_forward_failure */
1.80 markus 1326: interactive = 1;
1.50 markus 1327: }
1328:
1.70 markus 1329: check_agent_present();
1330: if (options.forward_agent) {
1331: debug("Requesting authentication agent forwarding.");
1332: channel_request_start(id, "auth-agent-req@openssh.com", 0);
1333: packet_send();
1.212 djm 1334: }
1.369 dtucker 1335:
1336: /* Tell the packet module whether this is an interactive session. */
1337: packet_set_interactive(interactive,
1338: options.ip_qos_interactive, options.ip_qos_bulk);
1.212 djm 1339:
1.214 djm 1340: client_session2_setup(id, tty_flag, subsystem_flag, getenv("TERM"),
1.311 djm 1341: NULL, fileno(stdin), &command, environ);
1.45 markus 1342: }
1343:
1.143 markus 1344: /* open new channel for a session */
1.126 itojun 1345: static int
1.143 markus 1346: ssh_session2_open(void)
1.45 markus 1347: {
1.118 markus 1348: Channel *c;
1349: int window, packetmax, in, out, err;
1.60 markus 1350:
1.62 markus 1351: if (stdin_null_flag) {
1.93 itojun 1352: in = open(_PATH_DEVNULL, O_RDONLY);
1.62 markus 1353: } else {
1354: in = dup(STDIN_FILENO);
1355: }
1.60 markus 1356: out = dup(STDOUT_FILENO);
1357: err = dup(STDERR_FILENO);
1.45 markus 1358:
1359: if (in < 0 || out < 0 || err < 0)
1.62 markus 1360: fatal("dup() in/out/err failed");
1.45 markus 1361:
1.69 markus 1362: /* enable nonblocking unless tty */
1363: if (!isatty(in))
1364: set_nonblock(in);
1365: if (!isatty(out))
1366: set_nonblock(out);
1367: if (!isatty(err))
1368: set_nonblock(err);
1369:
1.65 markus 1370: window = CHAN_SES_WINDOW_DEFAULT;
1371: packetmax = CHAN_SES_PACKET_DEFAULT;
1.164 markus 1372: if (tty_flag) {
1373: window >>= 1;
1374: packetmax >>= 1;
1.45 markus 1375: }
1.118 markus 1376: c = channel_new(
1.45 markus 1377: "session", SSH_CHANNEL_OPENING, in, out, err,
1.65 markus 1378: window, packetmax, CHAN_EXTENDED_WRITE,
1.192 markus 1379: "client-session", /*nonblock*/0);
1.45 markus 1380:
1.143 markus 1381: debug3("ssh_session2_open: channel_new: %d", c->self);
1.106 markus 1382:
1.122 markus 1383: channel_send_open(c->self);
1.143 markus 1384: if (!no_shell_flag)
1.310 djm 1385: channel_register_open_confirm(c->self,
1386: ssh_session2_setup, NULL);
1.106 markus 1387:
1.118 markus 1388: return c->self;
1.106 markus 1389: }
1390:
1.126 itojun 1391: static int
1.106 markus 1392: ssh_session2(void)
1393: {
1.143 markus 1394: int id = -1;
1.106 markus 1395:
1396: /* XXX should be pre-session */
1.368 djm 1397: if (!options.control_persist)
1398: ssh_init_stdio_forwarding();
1.106 markus 1399: ssh_init_forwarding();
1400:
1.344 djm 1401: /* Start listening for multiplex clients */
1402: muxserver_listen();
1403:
1404: /*
1.368 djm 1405: * If we are in control persist mode and have a working mux listen
1406: * socket, then prepare to background ourselves and have a foreground
1407: * client attach as a control slave.
1408: * NB. we must save copies of the flags that we override for
1.344 djm 1409: * the backgrounding, since we defer attachment of the slave until
1410: * after the connection is fully established (in particular,
1411: * async rfwd replies have been received for ExitOnForwardFailure).
1412: */
1413: if (options.control_persist && muxserver_sock != -1) {
1414: ostdin_null_flag = stdin_null_flag;
1415: ono_shell_flag = no_shell_flag;
1.359 djm 1416: orequest_tty = options.request_tty;
1.344 djm 1417: otty_flag = tty_flag;
1418: stdin_null_flag = 1;
1419: no_shell_flag = 1;
1420: tty_flag = 0;
1421: if (!fork_after_authentication_flag)
1422: need_controlpersist_detach = 1;
1423: fork_after_authentication_flag = 1;
1424: }
1.368 djm 1425: /*
1426: * ControlPersist mux listen socket setup failed, attempt the
1427: * stdio forward setup that we skipped earlier.
1428: */
1429: if (options.control_persist && muxserver_sock == -1)
1430: ssh_init_stdio_forwarding();
1.344 djm 1431:
1.143 markus 1432: if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN))
1433: id = ssh_session2_open();
1.314 djm 1434:
1435: /* If we don't expect to open a new session, then disallow it */
1.319 markus 1436: if (options.control_master == SSHCTL_MASTER_NO &&
1437: (datafellows & SSH_NEW_OPENSSH)) {
1.314 djm 1438: debug("Requesting no-more-sessions@openssh.com");
1439: packet_start(SSH2_MSG_GLOBAL_REQUEST);
1440: packet_put_cstring("no-more-sessions@openssh.com");
1441: packet_put_char(0);
1442: packet_send();
1443: }
1.255 reyk 1444:
1445: /* Execute a local command */
1446: if (options.local_command != NULL &&
1447: options.permit_local_command)
1448: ssh_local_cmd(options.local_command);
1.301 djm 1449:
1.342 djm 1450: /*
1451: * If requested and we are not interested in replies to remote
1452: * forwarding requests, then let ssh continue in the background.
1453: */
1.344 djm 1454: if (fork_after_authentication_flag) {
1455: if (options.exit_on_forward_failure &&
1456: options.num_remote_forwards > 0) {
1457: debug("deferring postauth fork until remote forward "
1458: "confirmation received");
1459: } else
1460: fork_postauth();
1.318 djm 1461: }
1.327 andreas 1462:
1463: if (options.use_roaming)
1464: request_roaming();
1.31 markus 1465:
1.119 stevesk 1466: return client_loop(tty_flag, tty_flag ?
1467: options.escape_char : SSH_ESCAPECHAR_NONE, id);
1.72 markus 1468: }
1469:
1.126 itojun 1470: static void
1.104 markus 1471: load_public_identity_files(void)
1472: {
1.275 djm 1473: char *filename, *cp, thishost[NI_MAXHOST];
1.306 deraadt 1474: char *pwdir = NULL, *pwname = NULL;
1.167 markus 1475: int i = 0;
1.104 markus 1476: Key *public;
1.275 djm 1477: struct passwd *pw;
1.335 djm 1478: u_int n_ids;
1479: char *identity_files[SSH_MAX_IDENTITY_FILES];
1480: Key *identity_keys[SSH_MAX_IDENTITY_FILES];
1.333 markus 1481: #ifdef ENABLE_PKCS11
1.167 markus 1482: Key **keys;
1.333 markus 1483: int nkeys;
1.335 djm 1484: #endif /* PKCS11 */
1.104 markus 1485:
1.335 djm 1486: n_ids = 0;
1487: bzero(identity_files, sizeof(identity_files));
1488: bzero(identity_keys, sizeof(identity_keys));
1489:
1490: #ifdef ENABLE_PKCS11
1.333 markus 1491: if (options.pkcs11_provider != NULL &&
1.167 markus 1492: options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
1.333 markus 1493: (pkcs11_init(!options.batch_mode) == 0) &&
1494: (nkeys = pkcs11_add_provider(options.pkcs11_provider, NULL,
1495: &keys)) > 0) {
1496: for (i = 0; i < nkeys; i++) {
1.335 djm 1497: if (n_ids >= SSH_MAX_IDENTITY_FILES) {
1498: key_free(keys[i]);
1499: continue;
1500: }
1501: identity_keys[n_ids] = keys[i];
1502: identity_files[n_ids] =
1.333 markus 1503: xstrdup(options.pkcs11_provider); /* XXX */
1.335 djm 1504: n_ids++;
1.167 markus 1505: }
1506: xfree(keys);
1.127 markus 1507: }
1.333 markus 1508: #endif /* ENABLE_PKCS11 */
1.275 djm 1509: if ((pw = getpwuid(original_real_uid)) == NULL)
1510: fatal("load_public_identity_files: getpwuid failed");
1.307 dtucker 1511: pwname = xstrdup(pw->pw_name);
1512: pwdir = xstrdup(pw->pw_dir);
1.275 djm 1513: if (gethostname(thishost, sizeof(thishost)) == -1)
1514: fatal("load_public_identity_files: gethostname: %s",
1515: strerror(errno));
1.335 djm 1516: for (i = 0; i < options.num_identity_files; i++) {
1.373 djm 1517: if (n_ids >= SSH_MAX_IDENTITY_FILES ||
1518: strcasecmp(options.identity_files[i], "none") == 0) {
1.335 djm 1519: xfree(options.identity_files[i]);
1520: continue;
1521: }
1.275 djm 1522: cp = tilde_expand_filename(options.identity_files[i],
1.131 millert 1523: original_real_uid);
1.306 deraadt 1524: filename = percent_expand(cp, "d", pwdir,
1525: "u", pwname, "l", thishost, "h", host,
1.275 djm 1526: "r", options.user, (char *)NULL);
1527: xfree(cp);
1.131 millert 1528: public = key_load_public(filename, NULL);
1529: debug("identity file %s type %d", filename,
1530: public ? public->type : -1);
1531: xfree(options.identity_files[i]);
1.335 djm 1532: identity_files[n_ids] = filename;
1533: identity_keys[n_ids] = public;
1534:
1535: if (++n_ids >= SSH_MAX_IDENTITY_FILES)
1536: continue;
1537:
1538: /* Try to add the certificate variant too */
1539: xasprintf(&cp, "%s-cert", filename);
1540: public = key_load_public(cp, NULL);
1541: debug("identity file %s type %d", cp,
1542: public ? public->type : -1);
1543: if (public == NULL) {
1544: xfree(cp);
1545: continue;
1546: }
1547: if (!key_is_cert(public)) {
1548: debug("%s: key %s type %s is not a certificate",
1549: __func__, cp, key_type(public));
1550: key_free(public);
1551: xfree(cp);
1552: continue;
1553: }
1554: identity_keys[n_ids] = public;
1555: /* point to the original path, most likely the private key */
1556: identity_files[n_ids] = xstrdup(filename);
1557: n_ids++;
1558: }
1559: options.num_identity_files = n_ids;
1560: memcpy(options.identity_files, identity_files, sizeof(identity_files));
1561: memcpy(options.identity_keys, identity_keys, sizeof(identity_keys));
1562:
1.306 deraadt 1563: bzero(pwname, strlen(pwname));
1.307 dtucker 1564: xfree(pwname);
1.306 deraadt 1565: bzero(pwdir, strlen(pwdir));
1.307 dtucker 1566: xfree(pwdir);
1.214 djm 1567: }
1.352 djm 1568:
1569: static void
1570: main_sigchld_handler(int sig)
1571: {
1572: int save_errno = errno;
1573: pid_t pid;
1574: int status;
1575:
1576: while ((pid = waitpid(-1, &status, WNOHANG)) > 0 ||
1577: (pid < 0 && errno == EINTR))
1578: ;
1579:
1580: signal(sig, main_sigchld_handler);
1581: errno = save_errno;
1582: }
1583: