Annotation of src/usr.bin/ssh/ssh.c, Revision 1.402
1.402 ! markus 1: /* $OpenBSD: ssh.c,v 1.401 2014/02/26 20:18:37 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:
1.402 ! markus 67: #ifdef WITH_OPENSSL
1.49 markus 68: #include <openssl/evp.h>
1.72 markus 69: #include <openssl/err.h>
1.402 ! markus 70: #endif
1.1 deraadt 71:
1.293 deraadt 72: #include "xmalloc.h"
1.84 markus 73: #include "ssh.h"
74: #include "ssh1.h"
75: #include "ssh2.h"
1.341 djm 76: #include "canohost.h"
1.84 markus 77: #include "compat.h"
78: #include "cipher.h"
1.1 deraadt 79: #include "packet.h"
80: #include "buffer.h"
1.123 markus 81: #include "channels.h"
1.49 markus 82: #include "key.h"
1.58 markus 83: #include "authfd.h"
1.49 markus 84: #include "authfile.h"
1.83 markus 85: #include "pathnames.h"
1.214 djm 86: #include "dispatch.h"
1.81 markus 87: #include "clientloop.h"
1.84 markus 88: #include "log.h"
89: #include "readconf.h"
90: #include "sshconnect.h"
91: #include "misc.h"
1.95 markus 92: #include "kex.h"
93: #include "mac.h"
1.213 deraadt 94: #include "sshpty.h"
1.212 djm 95: #include "match.h"
1.214 djm 96: #include "msg.h"
1.225 dtucker 97: #include "uidswap.h"
1.327 andreas 98: #include "roaming.h"
1.278 stevesk 99: #include "version.h"
1.49 markus 100:
1.333 markus 101: #ifdef ENABLE_PKCS11
102: #include "ssh-pkcs11.h"
1.137 jakob 103: #endif
1.127 markus 104:
1.49 markus 105: extern char *__progname;
1.1 deraadt 106:
1.316 djm 107: /* Flag indicating whether debug mode is on. May be set on the command line. */
1.1 deraadt 108: int debug_flag = 0;
109:
1.359 djm 110: /* Flag indicating whether a tty should be requested */
1.1 deraadt 111: int tty_flag = 0;
112:
1.45 markus 113: /* don't exec a shell */
114: int no_shell_flag = 0;
115:
1.33 markus 116: /*
117: * Flag indicating that nothing should be read from stdin. This can be set
118: * on the command line.
119: */
1.1 deraadt 120: int stdin_null_flag = 0;
121:
1.33 markus 122: /*
1.344 djm 123: * Flag indicating that the current process should be backgrounded and
124: * a new slave launched in the foreground for ControlPersist.
125: */
126: int need_controlpersist_detach = 0;
127:
128: /* Copies of flags for ControlPersist foreground slave */
1.359 djm 129: int ostdin_null_flag, ono_shell_flag, otty_flag, orequest_tty;
1.344 djm 130:
131: /*
1.33 markus 132: * Flag indicating that ssh should fork after authentication. This is useful
1.172 deraadt 133: * so that the passphrase can be entered manually, and then ssh goes to the
1.33 markus 134: * background.
135: */
1.1 deraadt 136: int fork_after_authentication_flag = 0;
137:
1.331 dtucker 138: /* forward stdio to remote host and port */
139: char *stdio_forward_host = NULL;
140: int stdio_forward_port = 0;
141:
1.33 markus 142: /*
143: * General data structure for command line options and options configurable
144: * in configuration files. See readconf.h.
145: */
1.1 deraadt 146: Options options;
147:
1.139 markus 148: /* optional user configfile */
149: char *config = NULL;
150:
1.33 markus 151: /*
152: * Name of the host we are connecting to. This is the name given on the
153: * command line, or the HostName specified for the user-supplied name in a
154: * configuration file.
155: */
1.1 deraadt 156: char *host;
157:
1.22 provos 158: /* socket address the host resolves to */
1.37 markus 159: struct sockaddr_storage hostaddr;
1.1 deraadt 160:
1.112 markus 161: /* Private host keys. */
1.173 markus 162: Sensitive sensitive_data;
1.1 deraadt 163:
1.10 dugsong 164: /* Original real UID. */
165: uid_t original_real_uid;
1.177 markus 166: uid_t original_effective_uid;
1.1 deraadt 167:
1.45 markus 168: /* command to be executed */
169: Buffer command;
170:
1.85 djm 171: /* Should we execute a command or invoke a subsystem? */
172: int subsystem_flag = 0;
173:
1.170 markus 174: /* # of replies received for global requests */
1.315 djm 175: static int remote_forward_confirms_received = 0;
1.170 markus 176:
1.313 djm 177: /* mux.c */
178: extern int muxserver_sock;
179: extern u_int muxclient_command;
180:
1.186 djm 181:
1.1 deraadt 182: /* Prints a help message to the user. This function never returns. */
183:
1.126 itojun 184: static void
1.93 itojun 185: usage(void)
1.1 deraadt 186: {
1.208 markus 187: fprintf(stderr,
1.321 jmc 188: "usage: ssh [-1246AaCfgKkMNnqsTtVvXxYy] [-b bind_address] [-c cipher_spec]\n"
1.375 dtucker 189: " [-D [bind_address:]port] [-E log_file] [-e escape_char]\n"
190: " [-F configfile] [-I pkcs11] [-i identity_file]\n"
1.394 deraadt 191: " [-L [bind_address:]port:host:hostport] [-l login_name] [-m mac_spec]\n"
1.395 jmc 192: " [-O ctl_cmd] [-o option] [-p port]\n"
193: " [-Q cipher | cipher-auth | mac | kex | key]\n"
194: " [-R [bind_address:]port:host:hostport] [-S ctl_path] [-W host:port]\n"
195: " [-w local_tun[:remote_tun]] [user@]hostname [command]\n"
1.208 markus 196: );
1.257 dtucker 197: exit(255);
1.1 deraadt 198: }
199:
1.126 itojun 200: static int ssh_session(void);
201: static int ssh_session2(void);
202: static void load_public_identity_files(void);
1.352 djm 203: static void main_sigchld_handler(int);
1.312 djm 204:
205: /* from muxclient.c */
206: void muxclient(const char *);
207: void muxserver_listen(void);
1.45 markus 208:
1.361 djm 209: /* ~/ expand a list of paths. NB. assumes path[n] is heap-allocated. */
210: static void
211: tilde_expand_paths(char **paths, u_int num_paths)
212: {
213: u_int i;
214: char *cp;
215:
216: for (i = 0; i < num_paths; i++) {
217: cp = tilde_expand_filename(paths[i], original_real_uid);
1.378 djm 218: free(paths[i]);
1.361 djm 219: paths[i] = cp;
220: }
221: }
222:
1.400 djm 223: /*
224: * Attempt to resolve a host name / port to a set of addresses and
225: * optionally return any CNAMEs encountered along the way.
226: * Returns NULL on failure.
227: * NB. this function must operate with a options having undefined members.
228: */
1.385 djm 229: static struct addrinfo *
1.400 djm 230: resolve_host(const char *name, int port, int logerr, char *cname, size_t clen)
1.385 djm 231: {
232: char strport[NI_MAXSERV];
233: struct addrinfo hints, *res;
234: int gaierr, loglevel = SYSLOG_LEVEL_DEBUG1;
235:
1.400 djm 236: if (port <= 0)
237: port = default_ssh_port();
238:
1.385 djm 239: snprintf(strport, sizeof strport, "%u", port);
1.398 tedu 240: memset(&hints, 0, sizeof(hints));
1.400 djm 241: hints.ai_family = options.address_family == -1 ?
242: AF_UNSPEC : options.address_family;
1.385 djm 243: hints.ai_socktype = SOCK_STREAM;
244: if (cname != NULL)
245: hints.ai_flags = AI_CANONNAME;
246: if ((gaierr = getaddrinfo(name, strport, &hints, &res)) != 0) {
247: if (logerr || (gaierr != EAI_NONAME && gaierr != EAI_NODATA))
248: loglevel = SYSLOG_LEVEL_ERROR;
249: do_log2(loglevel, "%s: Could not resolve hostname %.100s: %s",
250: __progname, name, ssh_gai_strerror(gaierr));
251: return NULL;
252: }
253: if (cname != NULL && res->ai_canonname != NULL) {
254: if (strlcpy(cname, res->ai_canonname, clen) >= clen) {
255: error("%s: host \"%s\" cname \"%s\" too long (max %lu)",
256: __func__, name, res->ai_canonname, (u_long)clen);
257: if (clen > 0)
258: *cname = '\0';
259: }
260: }
261: return res;
262: }
263:
264: /*
265: * Check whether the cname is a permitted replacement for the hostname
266: * and perform the replacement if it is.
1.400 djm 267: * NB. this function must operate with a options having undefined members.
1.385 djm 268: */
269: static int
270: check_follow_cname(char **namep, const char *cname)
271: {
272: int i;
273: struct allowed_cname *rule;
274:
275: if (*cname == '\0' || options.num_permitted_cnames == 0 ||
276: strcmp(*namep, cname) == 0)
277: return 0;
1.386 djm 278: if (options.canonicalize_hostname == SSH_CANONICALISE_NO)
1.385 djm 279: return 0;
280: /*
1.386 djm 281: * Don't attempt to canonicalize names that will be interpreted by
1.385 djm 282: * a proxy unless the user specifically requests so.
283: */
1.400 djm 284: if (!option_clear_or_none(options.proxy_command) &&
1.386 djm 285: options.canonicalize_hostname != SSH_CANONICALISE_ALWAYS)
1.385 djm 286: return 0;
287: debug3("%s: check \"%s\" CNAME \"%s\"", __func__, *namep, cname);
288: for (i = 0; i < options.num_permitted_cnames; i++) {
289: rule = options.permitted_cnames + i;
290: if (match_pattern_list(*namep, rule->source_list,
291: strlen(rule->source_list), 1) != 1 ||
292: match_pattern_list(cname, rule->target_list,
293: strlen(rule->target_list), 1) != 1)
294: continue;
1.386 djm 295: verbose("Canonicalized DNS aliased hostname "
1.385 djm 296: "\"%s\" => \"%s\"", *namep, cname);
297: free(*namep);
298: *namep = xstrdup(cname);
299: return 1;
300: }
301: return 0;
302: }
303:
304: /*
305: * Attempt to resolve the supplied hostname after applying the user's
1.387 djm 306: * canonicalization rules. Returns the address list for the host or NULL
307: * if no name was found after canonicalization.
1.400 djm 308: * NB. this function must operate with a options having undefined members.
1.385 djm 309: */
310: static struct addrinfo *
1.400 djm 311: resolve_canonicalize(char **hostp, int port)
1.385 djm 312: {
313: int i, ndots;
314: char *cp, *fullhost, cname_target[NI_MAXHOST];
315: struct addrinfo *addrs;
316:
1.386 djm 317: if (options.canonicalize_hostname == SSH_CANONICALISE_NO)
1.385 djm 318: return NULL;
1.400 djm 319:
1.385 djm 320: /*
1.386 djm 321: * Don't attempt to canonicalize names that will be interpreted by
1.385 djm 322: * a proxy unless the user specifically requests so.
323: */
1.400 djm 324: if (!option_clear_or_none(options.proxy_command) &&
1.386 djm 325: options.canonicalize_hostname != SSH_CANONICALISE_ALWAYS)
1.385 djm 326: return NULL;
1.400 djm 327:
1.387 djm 328: /* Don't apply canonicalization to sufficiently-qualified hostnames */
1.385 djm 329: ndots = 0;
330: for (cp = *hostp; *cp != '\0'; cp++) {
331: if (*cp == '.')
332: ndots++;
333: }
1.386 djm 334: if (ndots > options.canonicalize_max_dots) {
335: debug3("%s: not canonicalizing hostname \"%s\" (max dots %d)",
336: __func__, *hostp, options.canonicalize_max_dots);
1.385 djm 337: return NULL;
338: }
339: /* Attempt each supplied suffix */
340: for (i = 0; i < options.num_canonical_domains; i++) {
341: *cname_target = '\0';
342: xasprintf(&fullhost, "%s.%s.", *hostp,
343: options.canonical_domains[i]);
1.400 djm 344: debug3("%s: attempting \"%s\" => \"%s\"", __func__,
345: *hostp, fullhost);
346: if ((addrs = resolve_host(fullhost, port, 0,
1.385 djm 347: cname_target, sizeof(cname_target))) == NULL) {
348: free(fullhost);
349: continue;
350: }
351: /* Remove trailing '.' */
352: fullhost[strlen(fullhost) - 1] = '\0';
353: /* Follow CNAME if requested */
354: if (!check_follow_cname(&fullhost, cname_target)) {
1.386 djm 355: debug("Canonicalized hostname \"%s\" => \"%s\"",
1.385 djm 356: *hostp, fullhost);
357: }
358: free(*hostp);
359: *hostp = fullhost;
360: return addrs;
361: }
1.386 djm 362: if (!options.canonicalize_fallback_local)
1.400 djm 363: fatal("%s: Could not resolve host \"%s\"", __progname, *hostp);
364: debug2("%s: host %s not found in any suffix", __func__, *hostp);
1.385 djm 365: return NULL;
366: }
367:
1.32 deraadt 368: /*
1.400 djm 369: * Read per-user configuration file. Ignore the system wide config
370: * file if the user specifies a config file on the command line.
371: */
372: static void
373: process_config_files(struct passwd *pw)
374: {
375: char buf[MAXPATHLEN];
376: int r;
377:
378: if (config != NULL) {
379: if (strcasecmp(config, "none") != 0 &&
380: !read_config_file(config, pw, host, &options,
381: SSHCONF_USERCONF))
382: fatal("Can't open user config file %.100s: "
383: "%.100s", config, strerror(errno));
384: } else {
385: r = snprintf(buf, sizeof buf, "%s/%s", pw->pw_dir,
386: _PATH_SSH_USER_CONFFILE);
387: if (r > 0 && (size_t)r < sizeof(buf))
388: (void)read_config_file(buf, pw, host, &options,
389: SSHCONF_CHECKPERM|SSHCONF_USERCONF);
390:
391: /* Read systemwide configuration file after user config. */
392: (void)read_config_file(_PATH_HOST_CONFIG_FILE, pw, host,
393: &options, 0);
394: }
395: }
396:
397: /*
1.32 deraadt 398: * Main program for the ssh client.
399: */
1.2 provos 400: int
401: main(int ac, char **av)
1.1 deraadt 402: {
1.326 dtucker 403: int i, r, opt, exit_status, use_syslog;
1.375 dtucker 404: char *p, *cp, *line, *argv0, buf[MAXPATHLEN], *host_arg, *logfile;
1.358 djm 405: char thishost[NI_MAXHOST], shorthost[NI_MAXHOST], portstr[NI_MAXSERV];
1.385 djm 406: char cname[NI_MAXHOST];
1.31 markus 407: struct stat st;
1.98 markus 408: struct passwd *pw;
1.382 djm 409: int timeout_ms;
1.144 stevesk 410: extern int optind, optreset;
411: extern char *optarg;
1.232 djm 412: Forward fwd;
1.385 djm 413: struct addrinfo *addrs = NULL;
1.250 djm 414:
415: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
416: sanitise_stdfd();
1.31 markus 417:
1.33 markus 418: /*
1.346 djm 419: * Discard other fds that are hanging around. These can cause problem
420: * with backgrounded ssh processes started by ControlPersist.
421: */
422: closefrom(STDERR_FILENO + 1);
423:
424: /*
1.33 markus 425: * Save the original real uid. It will be needed later (uid-swapping
426: * may clobber the real uid).
427: */
1.31 markus 428: original_real_uid = getuid();
429: original_effective_uid = geteuid();
430:
1.184 stevesk 431: /*
432: * Use uid-swapping to give up root privileges for the duration of
433: * option processing. We will re-instantiate the rights when we are
434: * ready to create the privileged port, and will permanently drop
435: * them when the port has been created (actually, when the connection
436: * has been made, as we may need to create the port several times).
437: */
438: PRIV_END;
439:
1.31 markus 440: /* If we are installed setuid root be careful to not drop core. */
441: if (original_real_uid != original_effective_uid) {
442: struct rlimit rlim;
443: rlim.rlim_cur = rlim.rlim_max = 0;
444: if (setrlimit(RLIMIT_CORE, &rlim) < 0)
445: fatal("setrlimit failed: %.100s", strerror(errno));
1.1 deraadt 446: }
1.107 markus 447: /* Get user data. */
448: pw = getpwuid(original_real_uid);
449: if (!pw) {
1.380 djm 450: logit("No user exists for uid %lu", (u_long)original_real_uid);
1.257 dtucker 451: exit(255);
1.107 markus 452: }
453: /* Take a copy of the returned structure. */
454: pw = pwcopy(pw);
1.31 markus 455:
1.33 markus 456: /*
457: * Set our umask to something reasonable, as some files are created
458: * with the default umask. This will make them world-readable but
459: * writable only by the owner, which is ok for all files for which we
460: * don't set the modes explicitly.
461: */
1.31 markus 462: umask(022);
463:
1.316 djm 464: /*
465: * Initialize option structure to indicate that no values have been
466: * set.
467: */
1.31 markus 468: initialize_options(&options);
469:
470: /* Parse command-line arguments. */
471: host = NULL;
1.320 djm 472: use_syslog = 0;
1.375 dtucker 473: logfile = NULL;
1.325 markus 474: argv0 = av[0];
1.31 markus 475:
1.266 djm 476: again:
1.316 djm 477: while ((opt = getopt(ac, av, "1246ab:c:e:fgi:kl:m:no:p:qstvx"
1.376 djm 478: "ACD:E:F:I:KL:MNO:PQ:R:S:TVw:W:XYy")) != -1) {
1.31 markus 479: switch (opt) {
1.91 jakob 480: case '1':
481: options.protocol = SSH_PROTO_1;
482: break;
1.47 markus 483: case '2':
484: options.protocol = SSH_PROTO_2;
485: break;
1.37 markus 486: case '4':
1.196 djm 487: options.address_family = AF_INET;
1.37 markus 488: break;
489: case '6':
1.196 djm 490: options.address_family = AF_INET6;
1.37 markus 491: break;
1.31 markus 492: case 'n':
493: stdin_null_flag = 1;
494: break;
495: case 'f':
496: fork_after_authentication_flag = 1;
497: stdin_null_flag = 1;
498: break;
499: case 'x':
500: options.forward_x11 = 0;
501: break;
502: case 'X':
503: options.forward_x11 = 1;
504: break;
1.320 djm 505: case 'y':
506: use_syslog = 1;
507: break;
1.375 dtucker 508: case 'E':
509: logfile = xstrdup(optarg);
510: break;
1.202 markus 511: case 'Y':
512: options.forward_x11 = 1;
513: options.forward_x11_trusted = 1;
514: break;
1.31 markus 515: case 'g':
516: options.gateway_ports = 1;
517: break;
1.229 djm 518: case 'O':
1.332 djm 519: if (stdio_forward_host != NULL)
520: fatal("Cannot specify multiplexing "
521: "command with -W");
522: else if (muxclient_command != 0)
523: fatal("Multiplexing command already specified");
1.229 djm 524: if (strcmp(optarg, "check") == 0)
1.312 djm 525: muxclient_command = SSHMUX_COMMAND_ALIVE_CHECK;
1.338 markus 526: else if (strcmp(optarg, "forward") == 0)
527: muxclient_command = SSHMUX_COMMAND_FORWARD;
1.229 djm 528: else if (strcmp(optarg, "exit") == 0)
1.312 djm 529: muxclient_command = SSHMUX_COMMAND_TERMINATE;
1.357 djm 530: else if (strcmp(optarg, "stop") == 0)
531: muxclient_command = SSHMUX_COMMAND_STOP;
1.365 djm 532: else if (strcmp(optarg, "cancel") == 0)
533: muxclient_command = SSHMUX_COMMAND_CANCEL_FWD;
1.229 djm 534: else
535: fatal("Invalid multiplex command.");
536: break;
1.183 stevesk 537: case 'P': /* deprecated */
1.31 markus 538: options.use_privileged_port = 0;
1.376 djm 539: break;
1.394 deraadt 540: case 'Q':
1.376 djm 541: cp = NULL;
1.394 deraadt 542: if (strcmp(optarg, "cipher") == 0)
1.393 djm 543: cp = cipher_alg_list('\n', 0);
1.394 deraadt 544: else if (strcmp(optarg, "cipher-auth") == 0)
1.393 djm 545: cp = cipher_alg_list('\n', 1);
1.394 deraadt 546: else if (strcmp(optarg, "mac") == 0)
1.392 dtucker 547: cp = mac_alg_list('\n');
1.394 deraadt 548: else if (strcmp(optarg, "kex") == 0)
1.392 dtucker 549: cp = kex_alg_list('\n');
1.394 deraadt 550: else if (strcmp(optarg, "key") == 0)
1.396 markus 551: cp = key_alg_list(0, 0);
552: else if (strcmp(optarg, "key-cert") == 0)
553: cp = key_alg_list(1, 0);
554: else if (strcmp(optarg, "key-plain") == 0)
555: cp = key_alg_list(0, 1);
1.376 djm 556: if (cp == NULL)
557: fatal("Unsupported query \"%s\"", optarg);
558: printf("%s\n", cp);
559: free(cp);
560: exit(0);
1.31 markus 561: break;
562: case 'a':
563: options.forward_agent = 0;
1.53 markus 564: break;
565: case 'A':
566: options.forward_agent = 1;
1.31 markus 567: break;
568: case 'k':
1.204 dtucker 569: options.gss_deleg_creds = 0;
1.297 djm 570: break;
571: case 'K':
572: options.gss_authentication = 1;
573: options.gss_deleg_creds = 1;
1.31 markus 574: break;
575: case 'i':
576: if (stat(optarg, &st) < 0) {
1.128 fgsch 577: fprintf(stderr, "Warning: Identity file %s "
1.231 otto 578: "not accessible: %s.\n", optarg,
579: strerror(errno));
1.31 markus 580: break;
581: }
1.371 dtucker 582: add_identity_file(&options, NULL, optarg, 1);
1.31 markus 583: break;
1.127 markus 584: case 'I':
1.333 markus 585: #ifdef ENABLE_PKCS11
586: options.pkcs11_provider = xstrdup(optarg);
1.137 jakob 587: #else
1.333 markus 588: fprintf(stderr, "no support for PKCS#11.\n");
1.137 jakob 589: #endif
1.127 markus 590: break;
1.31 markus 591: case 't':
1.359 djm 592: if (options.request_tty == REQUEST_TTY_YES)
593: options.request_tty = REQUEST_TTY_FORCE;
594: else
595: options.request_tty = REQUEST_TTY_YES;
1.31 markus 596: break;
597: case 'v':
1.197 markus 598: if (debug_flag == 0) {
1.66 markus 599: debug_flag = 1;
600: options.log_level = SYSLOG_LEVEL_DEBUG1;
1.197 markus 601: } else {
602: if (options.log_level < SYSLOG_LEVEL_DEBUG3)
603: options.log_level++;
604: }
1.375 dtucker 605: break;
1.31 markus 606: case 'V':
1.209 markus 607: fprintf(stderr, "%s, %s\n",
1.402 ! markus 608: SSH_VERSION,
! 609: #ifdef WITH_OPENSSL
! 610: SSLeay_version(SSLEAY_VERSION)
! 611: #else
! 612: "without OpenSSL"
! 613: #endif
! 614: );
1.31 markus 615: if (opt == 'V')
616: exit(0);
617: break;
1.255 reyk 618: case 'w':
1.256 reyk 619: if (options.tun_open == -1)
620: options.tun_open = SSH_TUNMODE_DEFAULT;
1.255 reyk 621: options.tun_local = a2tun(optarg, &options.tun_remote);
1.256 reyk 622: if (options.tun_local == SSH_TUNID_ERR) {
1.316 djm 623: fprintf(stderr,
624: "Bad tun device '%s'\n", optarg);
1.257 dtucker 625: exit(255);
1.255 reyk 626: }
627: break;
1.331 dtucker 628: case 'W':
1.332 djm 629: if (stdio_forward_host != NULL)
630: fatal("stdio forward already specified");
631: if (muxclient_command != 0)
632: fatal("Cannot specify stdio forward with -O");
1.331 dtucker 633: if (parse_forward(&fwd, optarg, 1, 0)) {
634: stdio_forward_host = fwd.listen_host;
635: stdio_forward_port = fwd.listen_port;
1.378 djm 636: free(fwd.connect_host);
1.331 dtucker 637: } else {
638: fprintf(stderr,
639: "Bad stdio forwarding specification '%s'\n",
640: optarg);
641: exit(255);
642: }
1.359 djm 643: options.request_tty = REQUEST_TTY_NO;
1.331 dtucker 644: no_shell_flag = 1;
645: options.clear_forwardings = 1;
646: options.exit_on_forward_failure = 1;
647: break;
1.31 markus 648: case 'q':
649: options.log_level = SYSLOG_LEVEL_QUIET;
650: break;
651: case 'e':
652: if (optarg[0] == '^' && optarg[2] == 0 &&
1.128 fgsch 653: (u_char) optarg[1] >= 64 &&
654: (u_char) optarg[1] < 128)
1.78 markus 655: options.escape_char = (u_char) optarg[1] & 31;
1.31 markus 656: else if (strlen(optarg) == 1)
1.78 markus 657: options.escape_char = (u_char) optarg[0];
1.31 markus 658: else if (strcmp(optarg, "none") == 0)
1.119 stevesk 659: options.escape_char = SSH_ESCAPECHAR_NONE;
1.31 markus 660: else {
1.128 fgsch 661: fprintf(stderr, "Bad escape character '%s'.\n",
662: optarg);
1.257 dtucker 663: exit(255);
1.31 markus 664: }
665: break;
666: case 'c':
1.49 markus 667: if (ciphers_valid(optarg)) {
668: /* SSH2 only */
669: options.ciphers = xstrdup(optarg);
1.224 markus 670: options.cipher = SSH_CIPHER_INVALID;
1.49 markus 671: } else {
672: /* SSH1 only */
1.74 markus 673: options.cipher = cipher_number(optarg);
674: if (options.cipher == -1) {
1.128 fgsch 675: fprintf(stderr,
676: "Unknown cipher type '%s'\n",
677: optarg);
1.257 dtucker 678: exit(255);
1.49 markus 679: }
1.128 fgsch 680: if (options.cipher == SSH_CIPHER_3DES)
1.74 markus 681: options.ciphers = "3des-cbc";
1.128 fgsch 682: else if (options.cipher == SSH_CIPHER_BLOWFISH)
1.74 markus 683: options.ciphers = "blowfish-cbc";
1.128 fgsch 684: else
1.74 markus 685: options.ciphers = (char *)-1;
1.95 markus 686: }
687: break;
688: case 'm':
689: if (mac_valid(optarg))
690: options.macs = xstrdup(optarg);
691: else {
1.128 fgsch 692: fprintf(stderr, "Unknown mac type '%s'\n",
693: optarg);
1.257 dtucker 694: exit(255);
1.31 markus 695: }
696: break;
1.214 djm 697: case 'M':
1.242 djm 698: if (options.control_master == SSHCTL_MASTER_YES)
699: options.control_master = SSHCTL_MASTER_ASK;
700: else
701: options.control_master = SSHCTL_MASTER_YES;
1.214 djm 702: break;
1.31 markus 703: case 'p':
1.113 stevesk 704: options.port = a2port(optarg);
1.323 djm 705: if (options.port <= 0) {
1.109 markus 706: fprintf(stderr, "Bad port '%s'\n", optarg);
1.257 dtucker 707: exit(255);
1.109 markus 708: }
1.31 markus 709: break;
710: case 'l':
711: options.user = optarg;
712: break;
1.141 stevesk 713:
714: case 'L':
1.324 djm 715: if (parse_forward(&fwd, optarg, 0, 0))
1.232 djm 716: add_local_forward(&options, &fwd);
717: else {
1.128 fgsch 718: fprintf(stderr,
1.232 djm 719: "Bad local forwarding specification '%s'\n",
1.128 fgsch 720: optarg);
1.257 dtucker 721: exit(255);
1.31 markus 722: }
1.232 djm 723: break;
724:
725: case 'R':
1.324 djm 726: if (parse_forward(&fwd, optarg, 0, 1)) {
1.232 djm 727: add_remote_forward(&options, &fwd);
728: } else {
1.128 fgsch 729: fprintf(stderr,
1.232 djm 730: "Bad remote forwarding specification "
731: "'%s'\n", optarg);
1.257 dtucker 732: exit(255);
1.31 markus 733: }
734: break;
1.108 markus 735:
736: case 'D':
1.324 djm 737: if (parse_forward(&fwd, optarg, 1, 0)) {
1.322 stevesk 738: add_local_forward(&options, &fwd);
1.232 djm 739: } else {
1.322 stevesk 740: fprintf(stderr,
741: "Bad dynamic forwarding specification "
742: "'%s'\n", optarg);
1.257 dtucker 743: exit(255);
1.109 markus 744: }
1.108 markus 745: break;
746:
1.31 markus 747: case 'C':
748: options.compression = 1;
749: break;
1.45 markus 750: case 'N':
751: no_shell_flag = 1;
1.359 djm 752: options.request_tty = REQUEST_TTY_NO;
1.45 markus 753: break;
754: case 'T':
1.359 djm 755: options.request_tty = REQUEST_TTY_NO;
1.45 markus 756: break;
1.31 markus 757: case 'o':
1.205 markus 758: line = xstrdup(optarg);
1.382 djm 759: if (process_config_line(&options, pw, host ? host : "",
760: line, "command-line", 0, NULL, SSHCONF_USERCONF)
1.372 dtucker 761: != 0)
1.257 dtucker 762: exit(255);
1.378 djm 763: free(line);
1.31 markus 764: break;
1.85 djm 765: case 's':
766: subsystem_flag = 1;
1.117 markus 767: break;
1.214 djm 768: case 'S':
769: if (options.control_path != NULL)
770: free(options.control_path);
771: options.control_path = xstrdup(optarg);
772: break;
1.117 markus 773: case 'b':
774: options.bind_address = optarg;
1.85 djm 775: break;
1.139 markus 776: case 'F':
777: config = optarg;
778: break;
1.31 markus 779: default:
780: usage();
1.1 deraadt 781: }
1.31 markus 782: }
783:
1.128 fgsch 784: ac -= optind;
785: av += optind;
786:
1.329 guenther 787: if (ac > 0 && !host) {
1.188 markus 788: if (strrchr(*av, '@')) {
1.128 fgsch 789: p = xstrdup(*av);
1.188 markus 790: cp = strrchr(p, '@');
1.128 fgsch 791: if (cp == NULL || cp == p)
792: usage();
793: options.user = p;
794: *cp = '\0';
1.385 djm 795: host = xstrdup(++cp);
1.128 fgsch 796: } else
1.385 djm 797: host = xstrdup(*av);
1.189 millert 798: if (ac > 1) {
799: optind = optreset = 1;
1.128 fgsch 800: goto again;
801: }
1.189 millert 802: ac--, av++;
1.128 fgsch 803: }
804:
1.31 markus 805: /* Check that we got a host name. */
806: if (!host)
807: usage();
808:
1.385 djm 809: host_arg = xstrdup(host);
810:
1.402 ! markus 811: #ifdef WITH_OPENSSL
1.350 djm 812: OpenSSL_add_all_algorithms();
1.72 markus 813: ERR_load_crypto_strings();
1.402 ! markus 814: #endif
1.31 markus 815:
816: /* Initialize the command to execute on remote host. */
817: buffer_init(&command);
1.1 deraadt 818:
1.33 markus 819: /*
820: * Save the command to execute on the remote host in a buffer. There
821: * is no limit on the length of the command, except by the maximum
822: * packet size. Also sets the tty flag if there is no command.
823: */
1.128 fgsch 824: if (!ac) {
1.31 markus 825: /* No command specified - execute shell on a tty. */
1.85 djm 826: if (subsystem_flag) {
1.128 fgsch 827: fprintf(stderr,
828: "You must specify a subsystem to invoke.\n");
1.85 djm 829: usage();
830: }
1.31 markus 831: } else {
1.128 fgsch 832: /* A command has been specified. Store it into the buffer. */
833: for (i = 0; i < ac; i++) {
834: if (i)
1.31 markus 835: buffer_append(&command, " ", 1);
836: buffer_append(&command, av[i], strlen(av[i]));
837: }
838: }
839:
840: /* Cannot fork to background if no command. */
1.316 djm 841: if (fork_after_authentication_flag && buffer_len(&command) == 0 &&
842: !no_shell_flag)
843: fatal("Cannot fork into background without a command "
844: "to execute.");
1.31 markus 845:
1.101 markus 846: /*
847: * Initialize "log" output. Since we are the client all output
1.375 dtucker 848: * goes to stderr unless otherwise specified by -y or -E.
1.101 markus 849: */
1.375 dtucker 850: if (use_syslog && logfile != NULL)
851: fatal("Can't specify both -y and -E");
852: if (logfile != NULL) {
853: log_redirect_stderr_to(logfile);
1.378 djm 854: free(logfile);
1.375 dtucker 855: }
1.325 markus 856: log_init(argv0,
1.316 djm 857: options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level,
1.320 djm 858: SYSLOG_FACILITY_USER, !use_syslog);
1.375 dtucker 859:
860: if (debug_flag)
1.402 ! markus 861: logit("%s, %s", SSH_VERSION,
! 862: #ifdef WITH_OPENSSL
! 863: SSLeay_version(SSLEAY_VERSION)
! 864: #else
! 865: "without OpenSSL"
! 866: #endif
! 867: );
1.31 markus 868:
1.400 djm 869: /* Parse the configuration files */
870: process_config_files(pw);
871:
872: /* Hostname canonicalisation needs a few options filled. */
873: fill_default_options_for_canonicalization(&options);
874:
875: /* If the user has replaced the hostname then take it into use now */
876: if (options.hostname != NULL) {
877: /* NB. Please keep in sync with readconf.c:match_cfg_line() */
878: cp = percent_expand(options.hostname,
879: "h", host, (char *)NULL);
880: free(host);
881: host = cp;
882: }
883:
884: /* If canonicalization requested then try to apply it */
885: lowercase(host);
886: if (options.canonicalize_hostname != SSH_CANONICALISE_NO)
887: addrs = resolve_canonicalize(&host, options.port);
888:
1.139 markus 889: /*
1.401 djm 890: * If CanonicalizePermittedCNAMEs have been specified but
891: * other canonicalization did not happen (by not being requested
892: * or by failing with fallback) then the hostname may still be changed
893: * as a result of CNAME following.
894: *
895: * Try to resolve the bare hostname name using the system resolver's
896: * usual search rules and then apply the CNAME follow rules.
897: *
898: * Skip the lookup if a ProxyCommand is being used unless the user
899: * has specifically requested canonicalisation for this case via
900: * CanonicalizeHostname=always
1.139 markus 901: */
1.401 djm 902: if (addrs == NULL && options.num_permitted_cnames != 0 &&
903: (option_clear_or_none(options.proxy_command) ||
1.400 djm 904: options.canonicalize_hostname == SSH_CANONICALISE_ALWAYS)) {
905: if ((addrs = resolve_host(host, options.port, 1,
906: cname, sizeof(cname))) == NULL)
907: cleanup_exit(255); /* resolve_host logs the error */
908: check_follow_cname(&host, cname);
909: }
1.139 markus 910:
1.400 djm 911: /*
912: * If the target hostname has changed as a result of canonicalisation
913: * then re-parse the configuration files as new stanzas may match.
914: */
915: if (strcasecmp(host_arg, host) != 0) {
916: debug("Hostname has changed; re-reading configuration");
917: process_config_files(pw);
1.139 markus 918: }
1.31 markus 919:
920: /* Fill configuration defaults. */
921: fill_default_options(&options);
922:
1.400 djm 923: if (options.port == 0)
924: options.port = default_ssh_port();
1.196 djm 925: channel_set_af(options.address_family);
926:
1.383 djm 927: /* Tidy and check options */
928: if (options.host_key_alias != NULL)
929: lowercase(options.host_key_alias);
930: if (options.proxy_command != NULL &&
931: strcmp(options.proxy_command, "-") == 0 &&
932: options.proxy_use_fdpass)
933: fatal("ProxyCommand=- and ProxyUseFDPass are incompatible");
1.388 djm 934: if (original_effective_uid != 0)
935: options.use_privileged_port = 0;
1.383 djm 936:
1.31 markus 937: /* reinit */
1.325 markus 938: log_init(argv0, options.log_level, SYSLOG_FACILITY_USER, !use_syslog);
1.370 djm 939:
940: if (options.request_tty == REQUEST_TTY_YES ||
941: options.request_tty == REQUEST_TTY_FORCE)
942: tty_flag = 1;
943:
944: /* Allocate a tty by default if no command specified. */
945: if (buffer_len(&command) == 0)
946: tty_flag = options.request_tty != REQUEST_TTY_NO;
947:
948: /* Force no tty */
949: if (options.request_tty == REQUEST_TTY_NO || muxclient_command != 0)
950: tty_flag = 0;
951: /* Do not allocate a tty if stdin is not a tty. */
952: if ((!isatty(fileno(stdin)) || stdin_null_flag) &&
953: options.request_tty != REQUEST_TTY_FORCE) {
954: if (tty_flag)
955: logit("Pseudo-terminal will not be allocated because "
956: "stdin is not a terminal.");
957: tty_flag = 0;
958: }
1.31 markus 959:
960: if (options.user == NULL)
961: options.user = xstrdup(pw->pw_name);
1.343 djm 962:
1.358 djm 963: if (gethostname(thishost, sizeof(thishost)) == -1)
964: fatal("gethostname: %s", strerror(errno));
965: strlcpy(shorthost, thishost, sizeof(shorthost));
966: shorthost[strcspn(thishost, ".")] = '\0';
967: snprintf(portstr, sizeof(portstr), "%d", options.port);
968:
1.317 dtucker 969: if (options.local_command != NULL) {
970: debug3("expanding LocalCommand: %s", options.local_command);
971: cp = options.local_command;
972: options.local_command = percent_expand(cp, "d", pw->pw_dir,
1.356 djm 973: "h", host, "l", thishost, "n", host_arg, "r", options.user,
1.358 djm 974: "p", portstr, "u", pw->pw_name, "L", shorthost,
975: (char *)NULL);
1.317 dtucker 976: debug3("expanded LocalCommand: %s", options.local_command);
1.378 djm 977: free(cp);
1.304 dtucker 978: }
1.31 markus 979:
1.214 djm 980: if (options.control_path != NULL) {
1.241 djm 981: cp = tilde_expand_filename(options.control_path,
982: original_real_uid);
1.378 djm 983: free(options.control_path);
1.358 djm 984: options.control_path = percent_expand(cp, "h", host,
985: "l", thishost, "n", host_arg, "r", options.user,
986: "p", portstr, "u", pw->pw_name, "L", shorthost,
987: (char *)NULL);
1.378 djm 988: free(cp);
1.214 djm 989: }
1.312 djm 990: if (muxclient_command != 0 && options.control_path == NULL)
1.240 djm 991: fatal("No ControlPath specified for \"-O\" command");
1.242 djm 992: if (options.control_path != NULL)
1.312 djm 993: muxclient(options.control_path);
1.401 djm 994:
995: /*
996: * If hostname canonicalisation was not enabled, then we may not
997: * have yet resolved the hostname. Do so now.
998: */
999: if (addrs == NULL && options.proxy_command == NULL) {
1000: if ((addrs = resolve_host(host, options.port, 1,
1001: cname, sizeof(cname))) == NULL)
1002: cleanup_exit(255); /* resolve_host logs the error */
1003: }
1.214 djm 1004:
1.303 djm 1005: timeout_ms = options.connection_timeout * 1000;
1006:
1.77 markus 1007: /* Open a connection to the remote host. */
1.385 djm 1008: if (ssh_connect(host, addrs, &hostaddr, options.port,
1009: options.address_family, options.connection_attempts,
1010: &timeout_ms, options.tcp_keep_alive,
1.388 djm 1011: options.use_privileged_port) != 0)
1.257 dtucker 1012: exit(255);
1.31 markus 1013:
1.391 djm 1014: if (addrs != NULL)
1015: freeaddrinfo(addrs);
1016:
1.385 djm 1017: packet_set_timeout(options.server_alive_interval,
1018: options.server_alive_count_max);
1019:
1.303 djm 1020: if (timeout_ms > 0)
1021: debug3("timeout: %d ms remain after connect", timeout_ms);
1022:
1.33 markus 1023: /*
1024: * If we successfully made the connection, load the host private key
1025: * in case we will need it later for combined rsa-rhosts
1026: * authentication. This must be done before releasing extra
1027: * privileges, because the file is only readable by root.
1.174 markus 1028: * If we cannot access the private keys, load the public keys
1029: * instead and try to execute the ssh-keysign helper instead.
1.33 markus 1030: */
1.112 markus 1031: sensitive_data.nkeys = 0;
1032: sensitive_data.keys = NULL;
1.173 markus 1033: sensitive_data.external_keysign = 0;
1.178 markus 1034: if (options.rhosts_rsa_authentication ||
1035: options.hostbased_authentication) {
1.397 djm 1036: sensitive_data.nkeys = 9;
1.274 deraadt 1037: sensitive_data.keys = xcalloc(sensitive_data.nkeys,
1.180 deraadt 1038: sizeof(Key));
1.177 markus 1039:
1040: PRIV_START;
1.112 markus 1041: sensitive_data.keys[0] = key_load_private_type(KEY_RSA1,
1.276 dtucker 1042: _PATH_HOST_KEY_FILE, "", NULL, NULL);
1.345 djm 1043: sensitive_data.keys[1] = key_load_private_cert(KEY_DSA,
1044: _PATH_HOST_DSA_KEY_FILE, "", NULL);
1.349 djm 1045: sensitive_data.keys[2] = key_load_private_cert(KEY_ECDSA,
1046: _PATH_HOST_ECDSA_KEY_FILE, "", NULL);
1047: sensitive_data.keys[3] = key_load_private_cert(KEY_RSA,
1.345 djm 1048: _PATH_HOST_RSA_KEY_FILE, "", NULL);
1.397 djm 1049: sensitive_data.keys[4] = key_load_private_cert(KEY_ED25519,
1050: _PATH_HOST_ED25519_KEY_FILE, "", NULL);
1051: sensitive_data.keys[5] = key_load_private_type(KEY_DSA,
1.276 dtucker 1052: _PATH_HOST_DSA_KEY_FILE, "", NULL, NULL);
1.397 djm 1053: sensitive_data.keys[6] = key_load_private_type(KEY_ECDSA,
1.349 djm 1054: _PATH_HOST_ECDSA_KEY_FILE, "", NULL, NULL);
1.397 djm 1055: sensitive_data.keys[7] = key_load_private_type(KEY_RSA,
1.276 dtucker 1056: _PATH_HOST_RSA_KEY_FILE, "", NULL, NULL);
1.397 djm 1057: sensitive_data.keys[8] = key_load_private_type(KEY_ED25519,
1.396 markus 1058: _PATH_HOST_ED25519_KEY_FILE, "", NULL, NULL);
1.177 markus 1059: PRIV_END;
1.173 markus 1060:
1.181 markus 1061: if (options.hostbased_authentication == 1 &&
1062: sensitive_data.keys[0] == NULL &&
1.349 djm 1063: sensitive_data.keys[5] == NULL &&
1.396 markus 1064: sensitive_data.keys[6] == NULL &&
1.397 djm 1065: sensitive_data.keys[7] == NULL &&
1066: sensitive_data.keys[8] == NULL) {
1.345 djm 1067: sensitive_data.keys[1] = key_load_cert(
1068: _PATH_HOST_DSA_KEY_FILE);
1069: sensitive_data.keys[2] = key_load_cert(
1.349 djm 1070: _PATH_HOST_ECDSA_KEY_FILE);
1071: sensitive_data.keys[3] = key_load_cert(
1.345 djm 1072: _PATH_HOST_RSA_KEY_FILE);
1.397 djm 1073: sensitive_data.keys[4] = key_load_cert(
1074: _PATH_HOST_ED25519_KEY_FILE);
1075: sensitive_data.keys[5] = key_load_public(
1.173 markus 1076: _PATH_HOST_DSA_KEY_FILE, NULL);
1.397 djm 1077: sensitive_data.keys[6] = key_load_public(
1.349 djm 1078: _PATH_HOST_ECDSA_KEY_FILE, NULL);
1.397 djm 1079: sensitive_data.keys[7] = key_load_public(
1.173 markus 1080: _PATH_HOST_RSA_KEY_FILE, NULL);
1.397 djm 1081: sensitive_data.keys[8] = key_load_public(
1.396 markus 1082: _PATH_HOST_ED25519_KEY_FILE, NULL);
1.173 markus 1083: sensitive_data.external_keysign = 1;
1084: }
1.31 markus 1085: }
1.33 markus 1086: /*
1087: * Get rid of any extra privileges that we may have. We will no
1088: * longer need them. Also, extra privileges could make it very hard
1089: * to read identity files and other non-world-readable files from the
1090: * user's home directory if it happens to be on a NFS volume where
1091: * root is mapped to nobody.
1092: */
1.225 dtucker 1093: if (original_effective_uid == 0) {
1094: PRIV_START;
1095: permanently_set_uid(pw);
1096: }
1.31 markus 1097:
1.33 markus 1098: /*
1099: * Now that we are back to our own permissions, create ~/.ssh
1.254 djm 1100: * directory if it doesn't already exist.
1.33 markus 1101: */
1.367 djm 1102: if (config == NULL) {
1103: r = snprintf(buf, sizeof buf, "%s%s%s", pw->pw_dir,
1104: strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR);
1105: if (r > 0 && (size_t)r < sizeof(buf) && stat(buf, &st) < 0)
1106: if (mkdir(buf, 0700) < 0)
1107: error("Could not create directory '%.200s'.",
1108: buf);
1109: }
1.31 markus 1110:
1.104 markus 1111: /* load options.identity_files */
1112: load_public_identity_files();
1113:
1114: /* Expand ~ in known host file names. */
1.361 djm 1115: tilde_expand_paths(options.system_hostfiles,
1116: options.num_system_hostfiles);
1117: tilde_expand_paths(options.user_hostfiles, options.num_user_hostfiles);
1.149 markus 1118:
1119: signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
1.352 djm 1120: signal(SIGCHLD, main_sigchld_handler);
1.31 markus 1121:
1.316 djm 1122: /* Log into the remote system. Never returns if the login fails. */
1.303 djm 1123: ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr,
1.355 djm 1124: options.port, pw, timeout_ms);
1.339 djm 1125:
1126: if (packet_connection_is_on_socket()) {
1127: verbose("Authenticated to %s ([%s]:%d).", host,
1128: get_remote_ipaddr(), get_remote_port());
1129: } else {
1130: verbose("Authenticated to %s (via proxy).", host);
1131: }
1.31 markus 1132:
1.112 markus 1133: /* We no longer need the private host keys. Clear them now. */
1134: if (sensitive_data.nkeys != 0) {
1135: for (i = 0; i < sensitive_data.nkeys; i++) {
1136: if (sensitive_data.keys[i] != NULL) {
1137: /* Destroys contents safely */
1138: debug3("clear hostkey %d", i);
1139: key_free(sensitive_data.keys[i]);
1140: sensitive_data.keys[i] = NULL;
1141: }
1142: }
1.378 djm 1143: free(sensitive_data.keys);
1.134 markus 1144: }
1145: for (i = 0; i < options.num_identity_files; i++) {
1.378 djm 1146: free(options.identity_files[i]);
1147: options.identity_files[i] = NULL;
1.134 markus 1148: if (options.identity_keys[i]) {
1149: key_free(options.identity_keys[i]);
1150: options.identity_keys[i] = NULL;
1151: }
1.112 markus 1152: }
1.31 markus 1153:
1.45 markus 1154: exit_status = compat20 ? ssh_session2() : ssh_session();
1155: packet_close();
1.186 djm 1156:
1.312 djm 1157: if (options.control_path != NULL && muxserver_sock != -1)
1.214 djm 1158: unlink(options.control_path);
1159:
1.353 djm 1160: /* Kill ProxyCommand if it is running. */
1161: ssh_kill_proxy_command();
1.186 djm 1162:
1.45 markus 1163: return exit_status;
1164: }
1165:
1.344 djm 1166: static void
1167: control_persist_detach(void)
1168: {
1169: pid_t pid;
1.346 djm 1170: int devnull;
1.344 djm 1171:
1172: debug("%s: backgrounding master process", __func__);
1173:
1174: /*
1175: * master (current process) into the background, and make the
1176: * foreground process a client of the backgrounded master.
1177: */
1178: switch ((pid = fork())) {
1179: case -1:
1180: fatal("%s: fork: %s", __func__, strerror(errno));
1181: case 0:
1182: /* Child: master process continues mainloop */
1183: break;
1184: default:
1185: /* Parent: set up mux slave to connect to backgrounded master */
1186: debug2("%s: background process is %ld", __func__, (long)pid);
1187: stdin_null_flag = ostdin_null_flag;
1.359 djm 1188: options.request_tty = orequest_tty;
1.344 djm 1189: tty_flag = otty_flag;
1190: close(muxserver_sock);
1191: muxserver_sock = -1;
1.351 markus 1192: options.control_master = SSHCTL_MASTER_NO;
1.344 djm 1193: muxclient(options.control_path);
1194: /* muxclient() doesn't return on success. */
1195: fatal("Failed to connect to new control master");
1196: }
1.346 djm 1197: if ((devnull = open(_PATH_DEVNULL, O_RDWR)) == -1) {
1198: error("%s: open(\"/dev/null\"): %s", __func__,
1199: strerror(errno));
1200: } else {
1201: if (dup2(devnull, STDIN_FILENO) == -1 ||
1202: dup2(devnull, STDOUT_FILENO) == -1)
1203: error("%s: dup2: %s", __func__, strerror(errno));
1204: if (devnull > STDERR_FILENO)
1205: close(devnull);
1206: }
1.381 djm 1207: daemon(1, 1);
1.362 djm 1208: setproctitle("%s [mux]", options.control_path);
1.344 djm 1209: }
1210:
1211: /* Do fork() after authentication. Used by "ssh -f" */
1212: static void
1213: fork_postauth(void)
1214: {
1215: if (need_controlpersist_detach)
1216: control_persist_detach();
1217: debug("forking to background");
1218: fork_after_authentication_flag = 0;
1219: if (daemon(1, 1) < 0)
1220: fatal("daemon() failed: %.200s", strerror(errno));
1221: }
1222:
1.315 djm 1223: /* Callback for remote forward global requests */
1224: static void
1225: ssh_confirm_remote_forward(int type, u_int32_t seq, void *ctxt)
1226: {
1227: Forward *rfwd = (Forward *)ctxt;
1228:
1.324 djm 1229: /* XXX verbose() on failure? */
1.315 djm 1230: debug("remote forward %s for: listen %d, connect %s:%d",
1231: type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
1232: rfwd->listen_port, rfwd->connect_host, rfwd->connect_port);
1.366 markus 1233: if (rfwd->listen_port == 0) {
1234: if (type == SSH2_MSG_REQUEST_SUCCESS) {
1235: rfwd->allocated_port = packet_get_int();
1236: logit("Allocated port %u for remote forward to %s:%d",
1237: rfwd->allocated_port,
1238: rfwd->connect_host, rfwd->connect_port);
1239: channel_update_permitted_opens(rfwd->handle,
1240: rfwd->allocated_port);
1241: } else {
1242: channel_update_permitted_opens(rfwd->handle, -1);
1243: }
1.324 djm 1244: }
1245:
1.315 djm 1246: if (type == SSH2_MSG_REQUEST_FAILURE) {
1247: if (options.exit_on_forward_failure)
1248: fatal("Error: remote port forwarding failed for "
1249: "listen port %d", rfwd->listen_port);
1250: else
1251: logit("Warning: remote port forwarding failed for "
1252: "listen port %d", rfwd->listen_port);
1253: }
1.318 djm 1254: if (++remote_forward_confirms_received == options.num_remote_forwards) {
1.315 djm 1255: debug("All remote forwarding requests processed");
1.344 djm 1256: if (fork_after_authentication_flag)
1257: fork_postauth();
1.318 djm 1258: }
1.315 djm 1259: }
1260:
1.126 itojun 1261: static void
1.331 dtucker 1262: client_cleanup_stdio_fwd(int id, void *arg)
1263: {
1264: debug("stdio forwarding: done");
1265: cleanup_exit(0);
1266: }
1267:
1.368 djm 1268: static void
1269: ssh_init_stdio_forwarding(void)
1.331 dtucker 1270: {
1271: Channel *c;
1.332 djm 1272: int in, out;
1.331 dtucker 1273:
1.368 djm 1274: if (stdio_forward_host == NULL)
1275: return;
1.384 djm 1276: if (!compat20)
1.368 djm 1277: fatal("stdio forwarding require Protocol 2");
1278:
1279: debug3("%s: %s:%d", __func__, stdio_forward_host, stdio_forward_port);
1.332 djm 1280:
1.368 djm 1281: if ((in = dup(STDIN_FILENO)) < 0 ||
1282: (out = dup(STDOUT_FILENO)) < 0)
1.332 djm 1283: fatal("channel_connect_stdio_fwd: dup() in/out failed");
1.368 djm 1284: if ((c = channel_connect_stdio_fwd(stdio_forward_host,
1285: stdio_forward_port, in, out)) == NULL)
1286: fatal("%s: channel_connect_stdio_fwd failed", __func__);
1.331 dtucker 1287: channel_register_cleanup(c->self, client_cleanup_stdio_fwd, 0);
1288: }
1289:
1290: static void
1.70 markus 1291: ssh_init_forwarding(void)
1292: {
1.86 markus 1293: int success = 0;
1.70 markus 1294: int i;
1.331 dtucker 1295:
1.70 markus 1296: /* Initiate local TCP/IP port forwardings. */
1297: for (i = 0; i < options.num_local_forwards; i++) {
1.232 djm 1298: debug("Local connections to %.200s:%d forwarded to remote "
1299: "address %.200s:%d",
1.234 deraadt 1300: (options.local_forwards[i].listen_host == NULL) ?
1301: (options.gateway_ports ? "*" : "LOCALHOST") :
1.232 djm 1302: options.local_forwards[i].listen_host,
1303: options.local_forwards[i].listen_port,
1304: options.local_forwards[i].connect_host,
1305: options.local_forwards[i].connect_port);
1.158 markus 1306: success += channel_setup_local_fwd_listener(
1.232 djm 1307: options.local_forwards[i].listen_host,
1308: options.local_forwards[i].listen_port,
1309: options.local_forwards[i].connect_host,
1310: options.local_forwards[i].connect_port,
1.70 markus 1311: options.gateway_ports);
1312: }
1.283 markus 1313: if (i > 0 && success != i && options.exit_on_forward_failure)
1314: fatal("Could not request local forwarding.");
1.86 markus 1315: if (i > 0 && success == 0)
1316: error("Could not request local forwarding.");
1.70 markus 1317:
1318: /* Initiate remote TCP/IP port forwardings. */
1319: for (i = 0; i < options.num_remote_forwards; i++) {
1.232 djm 1320: debug("Remote connections from %.200s:%d forwarded to "
1321: "local address %.200s:%d",
1.248 djm 1322: (options.remote_forwards[i].listen_host == NULL) ?
1.253 djm 1323: "LOCALHOST" : options.remote_forwards[i].listen_host,
1.232 djm 1324: options.remote_forwards[i].listen_port,
1325: options.remote_forwards[i].connect_host,
1326: options.remote_forwards[i].connect_port);
1.366 markus 1327: options.remote_forwards[i].handle =
1328: channel_request_remote_forwarding(
1.232 djm 1329: options.remote_forwards[i].listen_host,
1330: options.remote_forwards[i].listen_port,
1331: options.remote_forwards[i].connect_host,
1.366 markus 1332: options.remote_forwards[i].connect_port);
1333: if (options.remote_forwards[i].handle < 0) {
1.283 markus 1334: if (options.exit_on_forward_failure)
1335: fatal("Could not request remote forwarding.");
1336: else
1337: logit("Warning: Could not request remote "
1338: "forwarding.");
1.366 markus 1339: } else {
1340: client_register_global_confirm(ssh_confirm_remote_forward,
1341: &options.remote_forwards[i]);
1.283 markus 1342: }
1.70 markus 1343: }
1.301 djm 1344:
1345: /* Initiate tunnel forwarding. */
1346: if (options.tun_open != SSH_TUNMODE_NO) {
1347: if (client_request_tun_fwd(options.tun_open,
1348: options.tun_local, options.tun_remote) == -1) {
1349: if (options.exit_on_forward_failure)
1350: fatal("Could not request tunnel forwarding.");
1351: else
1352: error("Could not request tunnel forwarding.");
1353: }
1354: }
1.70 markus 1355: }
1356:
1.126 itojun 1357: static void
1.70 markus 1358: check_agent_present(void)
1359: {
1360: if (options.forward_agent) {
1.254 djm 1361: /* Clear agent forwarding if we don't have an agent. */
1.185 stevesk 1362: if (!ssh_agent_present())
1.70 markus 1363: options.forward_agent = 0;
1364: }
1365: }
1366:
1.126 itojun 1367: static int
1.45 markus 1368: ssh_session(void)
1369: {
1370: int type;
1371: int interactive = 0;
1372: int have_tty = 0;
1373: struct winsize ws;
1374: char *cp;
1.243 djm 1375: const char *display;
1.45 markus 1376:
1.31 markus 1377: /* Enable compression if requested. */
1378: if (options.compression) {
1.316 djm 1379: debug("Requesting compression at level %d.",
1380: options.compression_level);
1.31 markus 1381:
1.316 djm 1382: if (options.compression_level < 1 ||
1383: options.compression_level > 9)
1384: fatal("Compression level must be from 1 (fast) to "
1385: "9 (slow, best).");
1.31 markus 1386:
1387: /* Send the request. */
1388: packet_start(SSH_CMSG_REQUEST_COMPRESSION);
1389: packet_put_int(options.compression_level);
1390: packet_send();
1391: packet_write_wait();
1.156 markus 1392: type = packet_read();
1.31 markus 1393: if (type == SSH_SMSG_SUCCESS)
1394: packet_start_compression(options.compression_level);
1395: else if (type == SSH_SMSG_FAILURE)
1.191 itojun 1396: logit("Warning: Remote host refused compression.");
1.31 markus 1397: else
1.316 djm 1398: packet_disconnect("Protocol error waiting for "
1399: "compression response.");
1.31 markus 1400: }
1401: /* Allocate a pseudo tty if appropriate. */
1402: if (tty_flag) {
1403: debug("Requesting pty.");
1404:
1405: /* Start the packet. */
1406: packet_start(SSH_CMSG_REQUEST_PTY);
1407:
1408: /* Store TERM in the packet. There is no limit on the
1409: length of the string. */
1410: cp = getenv("TERM");
1411: if (!cp)
1412: cp = "";
1.124 markus 1413: packet_put_cstring(cp);
1.31 markus 1414:
1415: /* Store window size in the packet. */
1416: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
1417: memset(&ws, 0, sizeof(ws));
1.269 deraadt 1418: packet_put_int((u_int)ws.ws_row);
1419: packet_put_int((u_int)ws.ws_col);
1420: packet_put_int((u_int)ws.ws_xpixel);
1421: packet_put_int((u_int)ws.ws_ypixel);
1.31 markus 1422:
1423: /* Store tty modes in the packet. */
1.115 stevesk 1424: tty_make_modes(fileno(stdin), NULL);
1.31 markus 1425:
1426: /* Send the packet, and wait for it to leave. */
1427: packet_send();
1428: packet_write_wait();
1429:
1430: /* Read response from the server. */
1.156 markus 1431: type = packet_read();
1.43 markus 1432: if (type == SSH_SMSG_SUCCESS) {
1.31 markus 1433: interactive = 1;
1.45 markus 1434: have_tty = 1;
1.43 markus 1435: } else if (type == SSH_SMSG_FAILURE)
1.316 djm 1436: logit("Warning: Remote host failed or refused to "
1437: "allocate a pseudo tty.");
1.31 markus 1438: else
1.316 djm 1439: packet_disconnect("Protocol error waiting for pty "
1440: "request response.");
1.31 markus 1441: }
1442: /* Request X11 forwarding if enabled and DISPLAY is set. */
1.243 djm 1443: display = getenv("DISPLAY");
1444: if (options.forward_x11 && display != NULL) {
1.150 stevesk 1445: char *proto, *data;
1.50 markus 1446: /* Get reasonable local authentication information. */
1.243 djm 1447: client_x11_get_proto(display, options.xauth_location,
1.384 djm 1448: options.forward_x11_trusted,
1.340 djm 1449: options.forward_x11_timeout,
1450: &proto, &data);
1.50 markus 1451: /* Request forwarding with authentication spoofing. */
1.316 djm 1452: debug("Requesting X11 forwarding with authentication "
1453: "spoofing.");
1.363 djm 1454: x11_request_forwarding_with_spoofing(0, display, proto,
1455: data, 0);
1.31 markus 1456: /* Read response from the server. */
1.156 markus 1457: type = packet_read();
1.31 markus 1458: if (type == SSH_SMSG_SUCCESS) {
1459: interactive = 1;
1.50 markus 1460: } else if (type == SSH_SMSG_FAILURE) {
1.191 itojun 1461: logit("Warning: Remote host denied X11 forwarding.");
1.50 markus 1462: } else {
1.316 djm 1463: packet_disconnect("Protocol error waiting for X11 "
1464: "forwarding");
1.50 markus 1465: }
1.31 markus 1466: }
1467: /* Tell the packet module whether this is an interactive session. */
1.354 djm 1468: packet_set_interactive(interactive,
1469: options.ip_qos_interactive, options.ip_qos_bulk);
1.31 markus 1470:
1471: /* Request authentication agent forwarding if appropriate. */
1.70 markus 1472: check_agent_present();
1473:
1.31 markus 1474: if (options.forward_agent) {
1475: debug("Requesting authentication agent forwarding.");
1476: auth_request_forwarding();
1477:
1478: /* Read response from the server. */
1.156 markus 1479: type = packet_read();
1.155 markus 1480: packet_check_eom();
1.31 markus 1481: if (type != SSH_SMSG_SUCCESS)
1.191 itojun 1482: logit("Warning: Remote host denied authentication agent forwarding.");
1.31 markus 1483: }
1484:
1.70 markus 1485: /* Initiate port forwardings. */
1.368 djm 1486: ssh_init_stdio_forwarding();
1.70 markus 1487: ssh_init_forwarding();
1.305 dtucker 1488:
1489: /* Execute a local command */
1490: if (options.local_command != NULL &&
1491: options.permit_local_command)
1492: ssh_local_cmd(options.local_command);
1.34 markus 1493:
1.318 djm 1494: /*
1495: * If requested and we are not interested in replies to remote
1496: * forwarding requests, then let ssh continue in the background.
1497: */
1.344 djm 1498: if (fork_after_authentication_flag) {
1499: if (options.exit_on_forward_failure &&
1500: options.num_remote_forwards > 0) {
1501: debug("deferring postauth fork until remote forward "
1502: "confirmation received");
1503: } else
1504: fork_postauth();
1.318 djm 1505: }
1.31 markus 1506:
1.33 markus 1507: /*
1508: * If a command was specified on the command line, execute the
1509: * command now. Otherwise request the server to start a shell.
1510: */
1.31 markus 1511: if (buffer_len(&command) > 0) {
1512: int len = buffer_len(&command);
1513: if (len > 900)
1514: len = 900;
1.316 djm 1515: debug("Sending command: %.*s", len,
1516: (u_char *)buffer_ptr(&command));
1.31 markus 1517: packet_start(SSH_CMSG_EXEC_CMD);
1518: packet_put_string(buffer_ptr(&command), buffer_len(&command));
1519: packet_send();
1520: packet_write_wait();
1521: } else {
1522: debug("Requesting shell.");
1523: packet_start(SSH_CMSG_EXEC_SHELL);
1524: packet_send();
1525: packet_write_wait();
1526: }
1527:
1528: /* Enter the interactive session. */
1.119 stevesk 1529: return client_loop(have_tty, tty_flag ?
1530: options.escape_char : SSH_ESCAPECHAR_NONE, 0);
1.89 markus 1531: }
1532:
1.214 djm 1533: /* request pty/x11/agent/tcpfwd/shell for channel */
1534: static void
1.337 djm 1535: ssh_session2_setup(int id, int success, void *arg)
1.214 djm 1536: {
1.215 djm 1537: extern char **environ;
1.243 djm 1538: const char *display;
1539: int interactive = tty_flag;
1.337 djm 1540:
1541: if (!success)
1542: return; /* No need for error message, channels code sens one */
1.215 djm 1543:
1.248 djm 1544: display = getenv("DISPLAY");
1.243 djm 1545: if (options.forward_x11 && display != NULL) {
1.150 stevesk 1546: char *proto, *data;
1.50 markus 1547: /* Get reasonable local authentication information. */
1.243 djm 1548: client_x11_get_proto(display, options.xauth_location,
1.340 djm 1549: options.forward_x11_trusted,
1550: options.forward_x11_timeout, &proto, &data);
1.50 markus 1551: /* Request forwarding with authentication spoofing. */
1.316 djm 1552: debug("Requesting X11 forwarding with authentication "
1553: "spoofing.");
1.363 djm 1554: x11_request_forwarding_with_spoofing(id, display, proto,
1555: data, 1);
1556: client_expect_confirm(id, "X11 forwarding", CONFIRM_WARN);
1557: /* XXX exit_on_forward_failure */
1.80 markus 1558: interactive = 1;
1.50 markus 1559: }
1560:
1.70 markus 1561: check_agent_present();
1562: if (options.forward_agent) {
1563: debug("Requesting authentication agent forwarding.");
1564: channel_request_start(id, "auth-agent-req@openssh.com", 0);
1565: packet_send();
1.212 djm 1566: }
1.369 dtucker 1567:
1568: /* Tell the packet module whether this is an interactive session. */
1569: packet_set_interactive(interactive,
1570: options.ip_qos_interactive, options.ip_qos_bulk);
1.212 djm 1571:
1.214 djm 1572: client_session2_setup(id, tty_flag, subsystem_flag, getenv("TERM"),
1.311 djm 1573: NULL, fileno(stdin), &command, environ);
1.45 markus 1574: }
1575:
1.143 markus 1576: /* open new channel for a session */
1.126 itojun 1577: static int
1.143 markus 1578: ssh_session2_open(void)
1.45 markus 1579: {
1.118 markus 1580: Channel *c;
1581: int window, packetmax, in, out, err;
1.60 markus 1582:
1.62 markus 1583: if (stdin_null_flag) {
1.93 itojun 1584: in = open(_PATH_DEVNULL, O_RDONLY);
1.62 markus 1585: } else {
1586: in = dup(STDIN_FILENO);
1587: }
1.60 markus 1588: out = dup(STDOUT_FILENO);
1589: err = dup(STDERR_FILENO);
1.45 markus 1590:
1591: if (in < 0 || out < 0 || err < 0)
1.62 markus 1592: fatal("dup() in/out/err failed");
1.45 markus 1593:
1.69 markus 1594: /* enable nonblocking unless tty */
1595: if (!isatty(in))
1596: set_nonblock(in);
1597: if (!isatty(out))
1598: set_nonblock(out);
1599: if (!isatty(err))
1600: set_nonblock(err);
1601:
1.65 markus 1602: window = CHAN_SES_WINDOW_DEFAULT;
1603: packetmax = CHAN_SES_PACKET_DEFAULT;
1.164 markus 1604: if (tty_flag) {
1605: window >>= 1;
1606: packetmax >>= 1;
1.45 markus 1607: }
1.118 markus 1608: c = channel_new(
1.45 markus 1609: "session", SSH_CHANNEL_OPENING, in, out, err,
1.65 markus 1610: window, packetmax, CHAN_EXTENDED_WRITE,
1.192 markus 1611: "client-session", /*nonblock*/0);
1.45 markus 1612:
1.143 markus 1613: debug3("ssh_session2_open: channel_new: %d", c->self);
1.106 markus 1614:
1.122 markus 1615: channel_send_open(c->self);
1.143 markus 1616: if (!no_shell_flag)
1.310 djm 1617: channel_register_open_confirm(c->self,
1618: ssh_session2_setup, NULL);
1.106 markus 1619:
1.118 markus 1620: return c->self;
1.106 markus 1621: }
1622:
1.126 itojun 1623: static int
1.106 markus 1624: ssh_session2(void)
1625: {
1.143 markus 1626: int id = -1;
1.106 markus 1627:
1628: /* XXX should be pre-session */
1.368 djm 1629: if (!options.control_persist)
1630: ssh_init_stdio_forwarding();
1.106 markus 1631: ssh_init_forwarding();
1632:
1.344 djm 1633: /* Start listening for multiplex clients */
1634: muxserver_listen();
1635:
1636: /*
1.368 djm 1637: * If we are in control persist mode and have a working mux listen
1638: * socket, then prepare to background ourselves and have a foreground
1639: * client attach as a control slave.
1640: * NB. we must save copies of the flags that we override for
1.344 djm 1641: * the backgrounding, since we defer attachment of the slave until
1642: * after the connection is fully established (in particular,
1643: * async rfwd replies have been received for ExitOnForwardFailure).
1644: */
1645: if (options.control_persist && muxserver_sock != -1) {
1646: ostdin_null_flag = stdin_null_flag;
1647: ono_shell_flag = no_shell_flag;
1.359 djm 1648: orequest_tty = options.request_tty;
1.344 djm 1649: otty_flag = tty_flag;
1650: stdin_null_flag = 1;
1651: no_shell_flag = 1;
1652: tty_flag = 0;
1653: if (!fork_after_authentication_flag)
1654: need_controlpersist_detach = 1;
1655: fork_after_authentication_flag = 1;
1656: }
1.368 djm 1657: /*
1658: * ControlPersist mux listen socket setup failed, attempt the
1659: * stdio forward setup that we skipped earlier.
1660: */
1661: if (options.control_persist && muxserver_sock == -1)
1662: ssh_init_stdio_forwarding();
1.344 djm 1663:
1.143 markus 1664: if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN))
1665: id = ssh_session2_open();
1.379 djm 1666: else {
1667: packet_set_interactive(
1668: options.control_master == SSHCTL_MASTER_NO,
1669: options.ip_qos_interactive, options.ip_qos_bulk);
1670: }
1.314 djm 1671:
1672: /* If we don't expect to open a new session, then disallow it */
1.319 markus 1673: if (options.control_master == SSHCTL_MASTER_NO &&
1674: (datafellows & SSH_NEW_OPENSSH)) {
1.314 djm 1675: debug("Requesting no-more-sessions@openssh.com");
1676: packet_start(SSH2_MSG_GLOBAL_REQUEST);
1677: packet_put_cstring("no-more-sessions@openssh.com");
1678: packet_put_char(0);
1679: packet_send();
1680: }
1.255 reyk 1681:
1682: /* Execute a local command */
1683: if (options.local_command != NULL &&
1684: options.permit_local_command)
1685: ssh_local_cmd(options.local_command);
1.301 djm 1686:
1.342 djm 1687: /*
1688: * If requested and we are not interested in replies to remote
1689: * forwarding requests, then let ssh continue in the background.
1690: */
1.344 djm 1691: if (fork_after_authentication_flag) {
1692: if (options.exit_on_forward_failure &&
1693: options.num_remote_forwards > 0) {
1694: debug("deferring postauth fork until remote forward "
1695: "confirmation received");
1696: } else
1697: fork_postauth();
1.318 djm 1698: }
1.327 andreas 1699:
1700: if (options.use_roaming)
1701: request_roaming();
1.31 markus 1702:
1.119 stevesk 1703: return client_loop(tty_flag, tty_flag ?
1704: options.escape_char : SSH_ESCAPECHAR_NONE, id);
1.72 markus 1705: }
1706:
1.126 itojun 1707: static void
1.104 markus 1708: load_public_identity_files(void)
1709: {
1.275 djm 1710: char *filename, *cp, thishost[NI_MAXHOST];
1.306 deraadt 1711: char *pwdir = NULL, *pwname = NULL;
1.167 markus 1712: int i = 0;
1.104 markus 1713: Key *public;
1.275 djm 1714: struct passwd *pw;
1.335 djm 1715: u_int n_ids;
1716: char *identity_files[SSH_MAX_IDENTITY_FILES];
1717: Key *identity_keys[SSH_MAX_IDENTITY_FILES];
1.333 markus 1718: #ifdef ENABLE_PKCS11
1.167 markus 1719: Key **keys;
1.333 markus 1720: int nkeys;
1.335 djm 1721: #endif /* PKCS11 */
1.104 markus 1722:
1.335 djm 1723: n_ids = 0;
1.398 tedu 1724: memset(identity_files, 0, sizeof(identity_files));
1725: memset(identity_keys, 0, sizeof(identity_keys));
1.335 djm 1726:
1727: #ifdef ENABLE_PKCS11
1.333 markus 1728: if (options.pkcs11_provider != NULL &&
1.167 markus 1729: options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
1.333 markus 1730: (pkcs11_init(!options.batch_mode) == 0) &&
1731: (nkeys = pkcs11_add_provider(options.pkcs11_provider, NULL,
1732: &keys)) > 0) {
1733: for (i = 0; i < nkeys; i++) {
1.335 djm 1734: if (n_ids >= SSH_MAX_IDENTITY_FILES) {
1735: key_free(keys[i]);
1736: continue;
1737: }
1738: identity_keys[n_ids] = keys[i];
1739: identity_files[n_ids] =
1.333 markus 1740: xstrdup(options.pkcs11_provider); /* XXX */
1.335 djm 1741: n_ids++;
1.167 markus 1742: }
1.378 djm 1743: free(keys);
1.127 markus 1744: }
1.333 markus 1745: #endif /* ENABLE_PKCS11 */
1.275 djm 1746: if ((pw = getpwuid(original_real_uid)) == NULL)
1747: fatal("load_public_identity_files: getpwuid failed");
1.307 dtucker 1748: pwname = xstrdup(pw->pw_name);
1749: pwdir = xstrdup(pw->pw_dir);
1.275 djm 1750: if (gethostname(thishost, sizeof(thishost)) == -1)
1751: fatal("load_public_identity_files: gethostname: %s",
1752: strerror(errno));
1.335 djm 1753: for (i = 0; i < options.num_identity_files; i++) {
1.373 djm 1754: if (n_ids >= SSH_MAX_IDENTITY_FILES ||
1755: strcasecmp(options.identity_files[i], "none") == 0) {
1.378 djm 1756: free(options.identity_files[i]);
1.335 djm 1757: continue;
1758: }
1.275 djm 1759: cp = tilde_expand_filename(options.identity_files[i],
1.131 millert 1760: original_real_uid);
1.306 deraadt 1761: filename = percent_expand(cp, "d", pwdir,
1762: "u", pwname, "l", thishost, "h", host,
1.275 djm 1763: "r", options.user, (char *)NULL);
1.378 djm 1764: free(cp);
1.131 millert 1765: public = key_load_public(filename, NULL);
1766: debug("identity file %s type %d", filename,
1767: public ? public->type : -1);
1.378 djm 1768: free(options.identity_files[i]);
1.335 djm 1769: identity_files[n_ids] = filename;
1770: identity_keys[n_ids] = public;
1771:
1772: if (++n_ids >= SSH_MAX_IDENTITY_FILES)
1773: continue;
1774:
1775: /* Try to add the certificate variant too */
1776: xasprintf(&cp, "%s-cert", filename);
1777: public = key_load_public(cp, NULL);
1778: debug("identity file %s type %d", cp,
1779: public ? public->type : -1);
1780: if (public == NULL) {
1.378 djm 1781: free(cp);
1.335 djm 1782: continue;
1783: }
1784: if (!key_is_cert(public)) {
1785: debug("%s: key %s type %s is not a certificate",
1786: __func__, cp, key_type(public));
1787: key_free(public);
1.378 djm 1788: free(cp);
1.335 djm 1789: continue;
1790: }
1791: identity_keys[n_ids] = public;
1792: /* point to the original path, most likely the private key */
1793: identity_files[n_ids] = xstrdup(filename);
1794: n_ids++;
1795: }
1796: options.num_identity_files = n_ids;
1797: memcpy(options.identity_files, identity_files, sizeof(identity_files));
1798: memcpy(options.identity_keys, identity_keys, sizeof(identity_keys));
1799:
1.398 tedu 1800: explicit_bzero(pwname, strlen(pwname));
1.378 djm 1801: free(pwname);
1.398 tedu 1802: explicit_bzero(pwdir, strlen(pwdir));
1.378 djm 1803: free(pwdir);
1.214 djm 1804: }
1.352 djm 1805:
1806: static void
1807: main_sigchld_handler(int sig)
1808: {
1809: int save_errno = errno;
1810: pid_t pid;
1811: int status;
1812:
1813: while ((pid = waitpid(-1, &status, WNOHANG)) > 0 ||
1814: (pid < 0 && errno == EINTR))
1815: ;
1816:
1817: signal(sig, main_sigchld_handler);
1818: errno = save_errno;
1819: }
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