Annotation of src/usr.bin/ssh/ssh.c, Revision 1.412
1.412 ! djm 1: /* $OpenBSD: ssh.c,v 1.411 2015/01/08 10:15:45 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/time.h>
1.352 djm 51: #include <sys/wait.h>
1.258 stevesk 52:
1.265 stevesk 53: #include <ctype.h>
1.285 stevesk 54: #include <errno.h>
1.281 stevesk 55: #include <fcntl.h>
1.286 stevesk 56: #include <netdb.h>
1.258 stevesk 57: #include <paths.h>
1.279 stevesk 58: #include <pwd.h>
1.263 stevesk 59: #include <signal.h>
1.287 stevesk 60: #include <stddef.h>
1.291 stevesk 61: #include <stdio.h>
1.290 stevesk 62: #include <stdlib.h>
1.289 stevesk 63: #include <string.h>
1.288 stevesk 64: #include <unistd.h>
1.49 markus 65:
1.402 markus 66: #ifdef WITH_OPENSSL
1.49 markus 67: #include <openssl/evp.h>
1.72 markus 68: #include <openssl/err.h>
1.402 markus 69: #endif
1.1 deraadt 70:
1.293 deraadt 71: #include "xmalloc.h"
1.84 markus 72: #include "ssh.h"
73: #include "ssh1.h"
74: #include "ssh2.h"
1.341 djm 75: #include "canohost.h"
1.84 markus 76: #include "compat.h"
77: #include "cipher.h"
1.405 djm 78: #include "digest.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"
1.406 millert 89: #include "misc.h"
1.84 markus 90: #include "readconf.h"
91: #include "sshconnect.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"
1.412 ! djm 100: #include "ssherr.h"
1.49 markus 101:
1.333 markus 102: #ifdef ENABLE_PKCS11
103: #include "ssh-pkcs11.h"
1.137 jakob 104: #endif
1.127 markus 105:
1.49 markus 106: extern char *__progname;
1.1 deraadt 107:
1.316 djm 108: /* Flag indicating whether debug mode is on. May be set on the command line. */
1.1 deraadt 109: int debug_flag = 0;
110:
1.359 djm 111: /* Flag indicating whether a tty should be requested */
1.1 deraadt 112: int tty_flag = 0;
113:
1.45 markus 114: /* don't exec a shell */
115: int no_shell_flag = 0;
116:
1.33 markus 117: /*
118: * Flag indicating that nothing should be read from stdin. This can be set
119: * on the command line.
120: */
1.1 deraadt 121: int stdin_null_flag = 0;
122:
1.33 markus 123: /*
1.344 djm 124: * Flag indicating that the current process should be backgrounded and
125: * a new slave launched in the foreground for ControlPersist.
126: */
127: int need_controlpersist_detach = 0;
128:
129: /* Copies of flags for ControlPersist foreground slave */
1.359 djm 130: int ostdin_null_flag, ono_shell_flag, otty_flag, orequest_tty;
1.344 djm 131:
132: /*
1.33 markus 133: * Flag indicating that ssh should fork after authentication. This is useful
1.172 deraadt 134: * so that the passphrase can be entered manually, and then ssh goes to the
1.33 markus 135: * background.
136: */
1.1 deraadt 137: int fork_after_authentication_flag = 0;
138:
1.331 dtucker 139: /* forward stdio to remote host and port */
140: char *stdio_forward_host = NULL;
141: int stdio_forward_port = 0;
142:
1.33 markus 143: /*
144: * General data structure for command line options and options configurable
145: * in configuration files. See readconf.h.
146: */
1.1 deraadt 147: Options options;
148:
1.139 markus 149: /* optional user configfile */
150: char *config = NULL;
151:
1.33 markus 152: /*
153: * Name of the host we are connecting to. This is the name given on the
154: * command line, or the HostName specified for the user-supplied name in a
155: * configuration file.
156: */
1.1 deraadt 157: char *host;
158:
1.22 provos 159: /* socket address the host resolves to */
1.37 markus 160: struct sockaddr_storage hostaddr;
1.1 deraadt 161:
1.112 markus 162: /* Private host keys. */
1.173 markus 163: Sensitive sensitive_data;
1.1 deraadt 164:
1.10 dugsong 165: /* Original real UID. */
166: uid_t original_real_uid;
1.177 markus 167: uid_t original_effective_uid;
1.1 deraadt 168:
1.45 markus 169: /* command to be executed */
170: Buffer command;
171:
1.85 djm 172: /* Should we execute a command or invoke a subsystem? */
173: int subsystem_flag = 0;
174:
1.170 markus 175: /* # of replies received for global requests */
1.315 djm 176: static int remote_forward_confirms_received = 0;
1.170 markus 177:
1.313 djm 178: /* mux.c */
179: extern int muxserver_sock;
180: extern u_int muxclient_command;
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,
1.409 jmc 188: "usage: ssh [-1246AaCfGgKkMNnqsTtVvXxYy] [-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
1.408 djm 373: process_config_files(const char *host_arg, struct passwd *pw, int post_canon)
1.400 djm 374: {
375: char buf[MAXPATHLEN];
376: int r;
377:
378: if (config != NULL) {
379: if (strcasecmp(config, "none") != 0 &&
1.408 djm 380: !read_config_file(config, pw, host, host_arg, &options,
381: SSHCONF_USERCONF | (post_canon ? SSHCONF_POSTCANON : 0)))
1.400 djm 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))
1.408 djm 388: (void)read_config_file(buf, pw, host, host_arg,
389: &options, SSHCONF_CHECKPERM | SSHCONF_USERCONF |
390: (post_canon ? SSHCONF_POSTCANON : 0));
1.400 djm 391:
392: /* Read systemwide configuration file after user config. */
1.408 djm 393: (void)read_config_file(_PATH_HOST_CONFIG_FILE, pw,
394: host, host_arg, &options,
395: post_canon ? SSHCONF_POSTCANON : 0);
396: }
397: }
398:
399: /* Rewrite the port number in an addrinfo list of addresses */
400: static void
401: set_addrinfo_port(struct addrinfo *addrs, int port)
402: {
403: struct addrinfo *addr;
404:
405: for (addr = addrs; addr != NULL; addr = addr->ai_next) {
406: switch (addr->ai_family) {
407: case AF_INET:
408: ((struct sockaddr_in *)addr->ai_addr)->
409: sin_port = htons(port);
410: break;
411: case AF_INET6:
412: ((struct sockaddr_in6 *)addr->ai_addr)->
413: sin6_port = htons(port);
414: break;
415: }
1.400 djm 416: }
417: }
418:
419: /*
1.32 deraadt 420: * Main program for the ssh client.
421: */
1.2 provos 422: int
423: main(int ac, char **av)
1.1 deraadt 424: {
1.408 djm 425: int i, r, opt, exit_status, use_syslog, config_test = 0;
1.375 dtucker 426: char *p, *cp, *line, *argv0, buf[MAXPATHLEN], *host_arg, *logfile;
1.358 djm 427: char thishost[NI_MAXHOST], shorthost[NI_MAXHOST], portstr[NI_MAXSERV];
1.385 djm 428: char cname[NI_MAXHOST];
1.31 markus 429: struct stat st;
1.98 markus 430: struct passwd *pw;
1.382 djm 431: int timeout_ms;
1.144 stevesk 432: extern int optind, optreset;
433: extern char *optarg;
1.406 millert 434: struct Forward fwd;
1.385 djm 435: struct addrinfo *addrs = NULL;
1.405 djm 436: struct ssh_digest_ctx *md;
437: u_char conn_hash[SSH_DIGEST_MAX_LENGTH];
438: char *conn_hash_hex;
1.250 djm 439:
440: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
441: sanitise_stdfd();
1.31 markus 442:
1.33 markus 443: /*
1.346 djm 444: * Discard other fds that are hanging around. These can cause problem
445: * with backgrounded ssh processes started by ControlPersist.
446: */
447: closefrom(STDERR_FILENO + 1);
448:
449: /*
1.33 markus 450: * Save the original real uid. It will be needed later (uid-swapping
451: * may clobber the real uid).
452: */
1.31 markus 453: original_real_uid = getuid();
454: original_effective_uid = geteuid();
455:
1.184 stevesk 456: /*
457: * Use uid-swapping to give up root privileges for the duration of
458: * option processing. We will re-instantiate the rights when we are
459: * ready to create the privileged port, and will permanently drop
460: * them when the port has been created (actually, when the connection
461: * has been made, as we may need to create the port several times).
462: */
463: PRIV_END;
464:
1.31 markus 465: /* If we are installed setuid root be careful to not drop core. */
466: if (original_real_uid != original_effective_uid) {
467: struct rlimit rlim;
468: rlim.rlim_cur = rlim.rlim_max = 0;
469: if (setrlimit(RLIMIT_CORE, &rlim) < 0)
470: fatal("setrlimit failed: %.100s", strerror(errno));
1.1 deraadt 471: }
1.107 markus 472: /* Get user data. */
473: pw = getpwuid(original_real_uid);
474: if (!pw) {
1.380 djm 475: logit("No user exists for uid %lu", (u_long)original_real_uid);
1.257 dtucker 476: exit(255);
1.107 markus 477: }
478: /* Take a copy of the returned structure. */
479: pw = pwcopy(pw);
1.31 markus 480:
1.33 markus 481: /*
482: * Set our umask to something reasonable, as some files are created
483: * with the default umask. This will make them world-readable but
484: * writable only by the owner, which is ok for all files for which we
485: * don't set the modes explicitly.
486: */
1.31 markus 487: umask(022);
488:
1.316 djm 489: /*
490: * Initialize option structure to indicate that no values have been
491: * set.
492: */
1.31 markus 493: initialize_options(&options);
494:
495: /* Parse command-line arguments. */
496: host = NULL;
1.320 djm 497: use_syslog = 0;
1.375 dtucker 498: logfile = NULL;
1.325 markus 499: argv0 = av[0];
1.31 markus 500:
1.266 djm 501: again:
1.316 djm 502: while ((opt = getopt(ac, av, "1246ab:c:e:fgi:kl:m:no:p:qstvx"
1.408 djm 503: "ACD:E:F:GI:KL:MNO:PQ:R:S:TVw:W:XYy")) != -1) {
1.31 markus 504: switch (opt) {
1.91 jakob 505: case '1':
506: options.protocol = SSH_PROTO_1;
507: break;
1.47 markus 508: case '2':
509: options.protocol = SSH_PROTO_2;
510: break;
1.37 markus 511: case '4':
1.196 djm 512: options.address_family = AF_INET;
1.37 markus 513: break;
514: case '6':
1.196 djm 515: options.address_family = AF_INET6;
1.37 markus 516: break;
1.31 markus 517: case 'n':
518: stdin_null_flag = 1;
519: break;
520: case 'f':
521: fork_after_authentication_flag = 1;
522: stdin_null_flag = 1;
523: break;
524: case 'x':
525: options.forward_x11 = 0;
526: break;
527: case 'X':
528: options.forward_x11 = 1;
529: break;
1.320 djm 530: case 'y':
531: use_syslog = 1;
532: break;
1.375 dtucker 533: case 'E':
534: logfile = xstrdup(optarg);
535: break;
1.408 djm 536: case 'G':
537: config_test = 1;
538: break;
1.202 markus 539: case 'Y':
540: options.forward_x11 = 1;
541: options.forward_x11_trusted = 1;
542: break;
1.31 markus 543: case 'g':
1.406 millert 544: options.fwd_opts.gateway_ports = 1;
1.31 markus 545: break;
1.229 djm 546: case 'O':
1.332 djm 547: if (stdio_forward_host != NULL)
548: fatal("Cannot specify multiplexing "
549: "command with -W");
550: else if (muxclient_command != 0)
551: fatal("Multiplexing command already specified");
1.229 djm 552: if (strcmp(optarg, "check") == 0)
1.312 djm 553: muxclient_command = SSHMUX_COMMAND_ALIVE_CHECK;
1.338 markus 554: else if (strcmp(optarg, "forward") == 0)
555: muxclient_command = SSHMUX_COMMAND_FORWARD;
1.229 djm 556: else if (strcmp(optarg, "exit") == 0)
1.312 djm 557: muxclient_command = SSHMUX_COMMAND_TERMINATE;
1.357 djm 558: else if (strcmp(optarg, "stop") == 0)
559: muxclient_command = SSHMUX_COMMAND_STOP;
1.365 djm 560: else if (strcmp(optarg, "cancel") == 0)
561: muxclient_command = SSHMUX_COMMAND_CANCEL_FWD;
1.229 djm 562: else
563: fatal("Invalid multiplex command.");
564: break;
1.183 stevesk 565: case 'P': /* deprecated */
1.31 markus 566: options.use_privileged_port = 0;
1.376 djm 567: break;
1.394 deraadt 568: case 'Q':
1.376 djm 569: cp = NULL;
1.394 deraadt 570: if (strcmp(optarg, "cipher") == 0)
1.393 djm 571: cp = cipher_alg_list('\n', 0);
1.394 deraadt 572: else if (strcmp(optarg, "cipher-auth") == 0)
1.393 djm 573: cp = cipher_alg_list('\n', 1);
1.394 deraadt 574: else if (strcmp(optarg, "mac") == 0)
1.392 dtucker 575: cp = mac_alg_list('\n');
1.394 deraadt 576: else if (strcmp(optarg, "kex") == 0)
1.392 dtucker 577: cp = kex_alg_list('\n');
1.394 deraadt 578: else if (strcmp(optarg, "key") == 0)
1.396 markus 579: cp = key_alg_list(0, 0);
580: else if (strcmp(optarg, "key-cert") == 0)
581: cp = key_alg_list(1, 0);
582: else if (strcmp(optarg, "key-plain") == 0)
583: cp = key_alg_list(0, 1);
1.376 djm 584: if (cp == NULL)
585: fatal("Unsupported query \"%s\"", optarg);
586: printf("%s\n", cp);
587: free(cp);
588: exit(0);
1.31 markus 589: break;
590: case 'a':
591: options.forward_agent = 0;
1.53 markus 592: break;
593: case 'A':
594: options.forward_agent = 1;
1.31 markus 595: break;
596: case 'k':
1.204 dtucker 597: options.gss_deleg_creds = 0;
1.297 djm 598: break;
599: case 'K':
600: options.gss_authentication = 1;
601: options.gss_deleg_creds = 1;
1.31 markus 602: break;
603: case 'i':
604: if (stat(optarg, &st) < 0) {
1.128 fgsch 605: fprintf(stderr, "Warning: Identity file %s "
1.231 otto 606: "not accessible: %s.\n", optarg,
607: strerror(errno));
1.31 markus 608: break;
609: }
1.371 dtucker 610: add_identity_file(&options, NULL, optarg, 1);
1.31 markus 611: break;
1.127 markus 612: case 'I':
1.333 markus 613: #ifdef ENABLE_PKCS11
614: options.pkcs11_provider = xstrdup(optarg);
1.137 jakob 615: #else
1.333 markus 616: fprintf(stderr, "no support for PKCS#11.\n");
1.137 jakob 617: #endif
1.127 markus 618: break;
1.31 markus 619: case 't':
1.359 djm 620: if (options.request_tty == REQUEST_TTY_YES)
621: options.request_tty = REQUEST_TTY_FORCE;
622: else
623: options.request_tty = REQUEST_TTY_YES;
1.31 markus 624: break;
625: case 'v':
1.197 markus 626: if (debug_flag == 0) {
1.66 markus 627: debug_flag = 1;
628: options.log_level = SYSLOG_LEVEL_DEBUG1;
1.197 markus 629: } else {
630: if (options.log_level < SYSLOG_LEVEL_DEBUG3)
631: options.log_level++;
632: }
1.375 dtucker 633: break;
1.31 markus 634: case 'V':
1.209 markus 635: fprintf(stderr, "%s, %s\n",
1.402 markus 636: SSH_VERSION,
637: #ifdef WITH_OPENSSL
638: SSLeay_version(SSLEAY_VERSION)
639: #else
640: "without OpenSSL"
641: #endif
642: );
1.31 markus 643: if (opt == 'V')
644: exit(0);
645: break;
1.255 reyk 646: case 'w':
1.256 reyk 647: if (options.tun_open == -1)
648: options.tun_open = SSH_TUNMODE_DEFAULT;
1.255 reyk 649: options.tun_local = a2tun(optarg, &options.tun_remote);
1.256 reyk 650: if (options.tun_local == SSH_TUNID_ERR) {
1.316 djm 651: fprintf(stderr,
652: "Bad tun device '%s'\n", optarg);
1.257 dtucker 653: exit(255);
1.255 reyk 654: }
655: break;
1.331 dtucker 656: case 'W':
1.332 djm 657: if (stdio_forward_host != NULL)
658: fatal("stdio forward already specified");
659: if (muxclient_command != 0)
660: fatal("Cannot specify stdio forward with -O");
1.331 dtucker 661: if (parse_forward(&fwd, optarg, 1, 0)) {
662: stdio_forward_host = fwd.listen_host;
663: stdio_forward_port = fwd.listen_port;
1.378 djm 664: free(fwd.connect_host);
1.331 dtucker 665: } else {
666: fprintf(stderr,
667: "Bad stdio forwarding specification '%s'\n",
668: optarg);
669: exit(255);
670: }
1.359 djm 671: options.request_tty = REQUEST_TTY_NO;
1.331 dtucker 672: no_shell_flag = 1;
673: options.clear_forwardings = 1;
674: options.exit_on_forward_failure = 1;
675: break;
1.31 markus 676: case 'q':
677: options.log_level = SYSLOG_LEVEL_QUIET;
678: break;
679: case 'e':
680: if (optarg[0] == '^' && optarg[2] == 0 &&
1.128 fgsch 681: (u_char) optarg[1] >= 64 &&
682: (u_char) optarg[1] < 128)
1.78 markus 683: options.escape_char = (u_char) optarg[1] & 31;
1.31 markus 684: else if (strlen(optarg) == 1)
1.78 markus 685: options.escape_char = (u_char) optarg[0];
1.31 markus 686: else if (strcmp(optarg, "none") == 0)
1.119 stevesk 687: options.escape_char = SSH_ESCAPECHAR_NONE;
1.31 markus 688: else {
1.128 fgsch 689: fprintf(stderr, "Bad escape character '%s'.\n",
690: optarg);
1.257 dtucker 691: exit(255);
1.31 markus 692: }
693: break;
694: case 'c':
1.49 markus 695: if (ciphers_valid(optarg)) {
696: /* SSH2 only */
697: options.ciphers = xstrdup(optarg);
1.224 markus 698: options.cipher = SSH_CIPHER_INVALID;
1.49 markus 699: } else {
700: /* SSH1 only */
1.74 markus 701: options.cipher = cipher_number(optarg);
702: if (options.cipher == -1) {
1.128 fgsch 703: fprintf(stderr,
704: "Unknown cipher type '%s'\n",
705: optarg);
1.257 dtucker 706: exit(255);
1.49 markus 707: }
1.128 fgsch 708: if (options.cipher == SSH_CIPHER_3DES)
1.74 markus 709: options.ciphers = "3des-cbc";
1.128 fgsch 710: else if (options.cipher == SSH_CIPHER_BLOWFISH)
1.74 markus 711: options.ciphers = "blowfish-cbc";
1.128 fgsch 712: else
1.74 markus 713: options.ciphers = (char *)-1;
1.95 markus 714: }
715: break;
716: case 'm':
717: if (mac_valid(optarg))
718: options.macs = xstrdup(optarg);
719: else {
1.128 fgsch 720: fprintf(stderr, "Unknown mac type '%s'\n",
721: optarg);
1.257 dtucker 722: exit(255);
1.31 markus 723: }
724: break;
1.214 djm 725: case 'M':
1.242 djm 726: if (options.control_master == SSHCTL_MASTER_YES)
727: options.control_master = SSHCTL_MASTER_ASK;
728: else
729: options.control_master = SSHCTL_MASTER_YES;
1.214 djm 730: break;
1.31 markus 731: case 'p':
1.113 stevesk 732: options.port = a2port(optarg);
1.323 djm 733: if (options.port <= 0) {
1.109 markus 734: fprintf(stderr, "Bad port '%s'\n", optarg);
1.257 dtucker 735: exit(255);
1.109 markus 736: }
1.31 markus 737: break;
738: case 'l':
739: options.user = optarg;
740: break;
1.141 stevesk 741:
742: case 'L':
1.324 djm 743: if (parse_forward(&fwd, optarg, 0, 0))
1.232 djm 744: add_local_forward(&options, &fwd);
745: else {
1.128 fgsch 746: fprintf(stderr,
1.232 djm 747: "Bad local forwarding specification '%s'\n",
1.128 fgsch 748: optarg);
1.257 dtucker 749: exit(255);
1.31 markus 750: }
1.232 djm 751: break;
752:
753: case 'R':
1.324 djm 754: if (parse_forward(&fwd, optarg, 0, 1)) {
1.232 djm 755: add_remote_forward(&options, &fwd);
756: } else {
1.128 fgsch 757: fprintf(stderr,
1.232 djm 758: "Bad remote forwarding specification "
759: "'%s'\n", optarg);
1.257 dtucker 760: exit(255);
1.31 markus 761: }
762: break;
1.108 markus 763:
764: case 'D':
1.324 djm 765: if (parse_forward(&fwd, optarg, 1, 0)) {
1.322 stevesk 766: add_local_forward(&options, &fwd);
1.232 djm 767: } else {
1.322 stevesk 768: fprintf(stderr,
769: "Bad dynamic forwarding specification "
770: "'%s'\n", optarg);
1.257 dtucker 771: exit(255);
1.109 markus 772: }
1.108 markus 773: break;
774:
1.31 markus 775: case 'C':
776: options.compression = 1;
777: break;
1.45 markus 778: case 'N':
779: no_shell_flag = 1;
1.359 djm 780: options.request_tty = REQUEST_TTY_NO;
1.45 markus 781: break;
782: case 'T':
1.359 djm 783: options.request_tty = REQUEST_TTY_NO;
1.45 markus 784: break;
1.31 markus 785: case 'o':
1.205 markus 786: line = xstrdup(optarg);
1.408 djm 787: if (process_config_line(&options, pw,
788: host ? host : "", host ? host : "", line,
789: "command-line", 0, NULL, SSHCONF_USERCONF) != 0)
1.257 dtucker 790: exit(255);
1.378 djm 791: free(line);
1.31 markus 792: break;
1.85 djm 793: case 's':
794: subsystem_flag = 1;
1.117 markus 795: break;
1.214 djm 796: case 'S':
797: if (options.control_path != NULL)
798: free(options.control_path);
799: options.control_path = xstrdup(optarg);
800: break;
1.117 markus 801: case 'b':
802: options.bind_address = optarg;
1.85 djm 803: break;
1.139 markus 804: case 'F':
805: config = optarg;
806: break;
1.31 markus 807: default:
808: usage();
1.1 deraadt 809: }
1.31 markus 810: }
811:
1.128 fgsch 812: ac -= optind;
813: av += optind;
814:
1.329 guenther 815: if (ac > 0 && !host) {
1.188 markus 816: if (strrchr(*av, '@')) {
1.128 fgsch 817: p = xstrdup(*av);
1.188 markus 818: cp = strrchr(p, '@');
1.128 fgsch 819: if (cp == NULL || cp == p)
820: usage();
821: options.user = p;
822: *cp = '\0';
1.385 djm 823: host = xstrdup(++cp);
1.128 fgsch 824: } else
1.385 djm 825: host = xstrdup(*av);
1.189 millert 826: if (ac > 1) {
827: optind = optreset = 1;
1.128 fgsch 828: goto again;
829: }
1.189 millert 830: ac--, av++;
1.128 fgsch 831: }
832:
1.31 markus 833: /* Check that we got a host name. */
834: if (!host)
835: usage();
836:
1.385 djm 837: host_arg = xstrdup(host);
838:
1.402 markus 839: #ifdef WITH_OPENSSL
1.350 djm 840: OpenSSL_add_all_algorithms();
1.72 markus 841: ERR_load_crypto_strings();
1.402 markus 842: #endif
1.31 markus 843:
844: /* Initialize the command to execute on remote host. */
845: buffer_init(&command);
1.1 deraadt 846:
1.33 markus 847: /*
848: * Save the command to execute on the remote host in a buffer. There
849: * is no limit on the length of the command, except by the maximum
850: * packet size. Also sets the tty flag if there is no command.
851: */
1.128 fgsch 852: if (!ac) {
1.31 markus 853: /* No command specified - execute shell on a tty. */
1.85 djm 854: if (subsystem_flag) {
1.128 fgsch 855: fprintf(stderr,
856: "You must specify a subsystem to invoke.\n");
1.85 djm 857: usage();
858: }
1.31 markus 859: } else {
1.128 fgsch 860: /* A command has been specified. Store it into the buffer. */
861: for (i = 0; i < ac; i++) {
862: if (i)
1.31 markus 863: buffer_append(&command, " ", 1);
864: buffer_append(&command, av[i], strlen(av[i]));
865: }
866: }
867:
868: /* Cannot fork to background if no command. */
1.316 djm 869: if (fork_after_authentication_flag && buffer_len(&command) == 0 &&
870: !no_shell_flag)
871: fatal("Cannot fork into background without a command "
872: "to execute.");
1.31 markus 873:
1.101 markus 874: /*
875: * Initialize "log" output. Since we are the client all output
1.375 dtucker 876: * goes to stderr unless otherwise specified by -y or -E.
1.101 markus 877: */
1.375 dtucker 878: if (use_syslog && logfile != NULL)
879: fatal("Can't specify both -y and -E");
880: if (logfile != NULL) {
881: log_redirect_stderr_to(logfile);
1.378 djm 882: free(logfile);
1.375 dtucker 883: }
1.325 markus 884: log_init(argv0,
1.316 djm 885: options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level,
1.320 djm 886: SYSLOG_FACILITY_USER, !use_syslog);
1.375 dtucker 887:
888: if (debug_flag)
1.402 markus 889: logit("%s, %s", SSH_VERSION,
890: #ifdef WITH_OPENSSL
891: SSLeay_version(SSLEAY_VERSION)
892: #else
893: "without OpenSSL"
894: #endif
895: );
1.31 markus 896:
1.400 djm 897: /* Parse the configuration files */
1.408 djm 898: process_config_files(host_arg, pw, 0);
1.400 djm 899:
900: /* Hostname canonicalisation needs a few options filled. */
901: fill_default_options_for_canonicalization(&options);
902:
903: /* If the user has replaced the hostname then take it into use now */
904: if (options.hostname != NULL) {
905: /* NB. Please keep in sync with readconf.c:match_cfg_line() */
906: cp = percent_expand(options.hostname,
907: "h", host, (char *)NULL);
908: free(host);
909: host = cp;
1.408 djm 910: free(options.hostname);
911: options.hostname = xstrdup(host);
1.400 djm 912: }
913:
914: /* If canonicalization requested then try to apply it */
915: lowercase(host);
916: if (options.canonicalize_hostname != SSH_CANONICALISE_NO)
917: addrs = resolve_canonicalize(&host, options.port);
918:
1.139 markus 919: /*
1.401 djm 920: * If CanonicalizePermittedCNAMEs have been specified but
921: * other canonicalization did not happen (by not being requested
922: * or by failing with fallback) then the hostname may still be changed
923: * as a result of CNAME following.
924: *
925: * Try to resolve the bare hostname name using the system resolver's
926: * usual search rules and then apply the CNAME follow rules.
927: *
928: * Skip the lookup if a ProxyCommand is being used unless the user
929: * has specifically requested canonicalisation for this case via
930: * CanonicalizeHostname=always
1.139 markus 931: */
1.401 djm 932: if (addrs == NULL && options.num_permitted_cnames != 0 &&
933: (option_clear_or_none(options.proxy_command) ||
1.400 djm 934: options.canonicalize_hostname == SSH_CANONICALISE_ALWAYS)) {
1.403 djm 935: if ((addrs = resolve_host(host, options.port,
936: option_clear_or_none(options.proxy_command),
937: cname, sizeof(cname))) == NULL) {
938: /* Don't fatal proxied host names not in the DNS */
939: if (option_clear_or_none(options.proxy_command))
940: cleanup_exit(255); /* logged in resolve_host */
941: } else
942: check_follow_cname(&host, cname);
1.400 djm 943: }
1.139 markus 944:
1.400 djm 945: /*
1.408 djm 946: * If canonicalisation is enabled then re-parse the configuration
947: * files as new stanzas may match.
1.400 djm 948: */
1.408 djm 949: if (options.canonicalize_hostname != 0) {
950: debug("Re-reading configuration after hostname "
951: "canonicalisation");
952: free(options.hostname);
953: options.hostname = xstrdup(host);
954: process_config_files(host_arg, pw, 1);
955: /*
956: * Address resolution happens early with canonicalisation
957: * enabled and the port number may have changed since, so
958: * reset it in address list
959: */
960: if (addrs != NULL && options.port > 0)
961: set_addrinfo_port(addrs, options.port);
1.139 markus 962: }
1.31 markus 963:
964: /* Fill configuration defaults. */
965: fill_default_options(&options);
966:
1.400 djm 967: if (options.port == 0)
968: options.port = default_ssh_port();
1.196 djm 969: channel_set_af(options.address_family);
970:
1.383 djm 971: /* Tidy and check options */
972: if (options.host_key_alias != NULL)
973: lowercase(options.host_key_alias);
974: if (options.proxy_command != NULL &&
975: strcmp(options.proxy_command, "-") == 0 &&
976: options.proxy_use_fdpass)
977: fatal("ProxyCommand=- and ProxyUseFDPass are incompatible");
1.388 djm 978: if (original_effective_uid != 0)
979: options.use_privileged_port = 0;
1.383 djm 980:
1.31 markus 981: /* reinit */
1.325 markus 982: log_init(argv0, options.log_level, SYSLOG_FACILITY_USER, !use_syslog);
1.370 djm 983:
984: if (options.request_tty == REQUEST_TTY_YES ||
985: options.request_tty == REQUEST_TTY_FORCE)
986: tty_flag = 1;
987:
988: /* Allocate a tty by default if no command specified. */
989: if (buffer_len(&command) == 0)
990: tty_flag = options.request_tty != REQUEST_TTY_NO;
991:
992: /* Force no tty */
993: if (options.request_tty == REQUEST_TTY_NO || muxclient_command != 0)
994: tty_flag = 0;
995: /* Do not allocate a tty if stdin is not a tty. */
996: if ((!isatty(fileno(stdin)) || stdin_null_flag) &&
997: options.request_tty != REQUEST_TTY_FORCE) {
998: if (tty_flag)
999: logit("Pseudo-terminal will not be allocated because "
1000: "stdin is not a terminal.");
1001: tty_flag = 0;
1002: }
1.31 markus 1003:
1004: if (options.user == NULL)
1005: options.user = xstrdup(pw->pw_name);
1.343 djm 1006:
1.358 djm 1007: if (gethostname(thishost, sizeof(thishost)) == -1)
1008: fatal("gethostname: %s", strerror(errno));
1009: strlcpy(shorthost, thishost, sizeof(shorthost));
1010: shorthost[strcspn(thishost, ".")] = '\0';
1011: snprintf(portstr, sizeof(portstr), "%d", options.port);
1012:
1.405 djm 1013: if ((md = ssh_digest_start(SSH_DIGEST_SHA1)) == NULL ||
1014: ssh_digest_update(md, thishost, strlen(thishost)) < 0 ||
1015: ssh_digest_update(md, host, strlen(host)) < 0 ||
1016: ssh_digest_update(md, portstr, strlen(portstr)) < 0 ||
1017: ssh_digest_update(md, options.user, strlen(options.user)) < 0 ||
1018: ssh_digest_final(md, conn_hash, sizeof(conn_hash)) < 0)
1019: fatal("%s: mux digest failed", __func__);
1020: ssh_digest_free(md);
1021: conn_hash_hex = tohex(conn_hash, ssh_digest_bytes(SSH_DIGEST_SHA1));
1022:
1.317 dtucker 1023: if (options.local_command != NULL) {
1024: debug3("expanding LocalCommand: %s", options.local_command);
1025: cp = options.local_command;
1.405 djm 1026: options.local_command = percent_expand(cp,
1027: "C", conn_hash_hex,
1028: "L", shorthost,
1029: "d", pw->pw_dir,
1030: "h", host,
1031: "l", thishost,
1032: "n", host_arg,
1033: "p", portstr,
1034: "r", options.user,
1035: "u", pw->pw_name,
1.358 djm 1036: (char *)NULL);
1.317 dtucker 1037: debug3("expanded LocalCommand: %s", options.local_command);
1.378 djm 1038: free(cp);
1.304 dtucker 1039: }
1.31 markus 1040:
1.214 djm 1041: if (options.control_path != NULL) {
1.241 djm 1042: cp = tilde_expand_filename(options.control_path,
1043: original_real_uid);
1.378 djm 1044: free(options.control_path);
1.405 djm 1045: options.control_path = percent_expand(cp,
1046: "C", conn_hash_hex,
1047: "L", shorthost,
1048: "h", host,
1049: "l", thishost,
1050: "n", host_arg,
1051: "p", portstr,
1052: "r", options.user,
1053: "u", pw->pw_name,
1.358 djm 1054: (char *)NULL);
1.378 djm 1055: free(cp);
1.214 djm 1056: }
1.405 djm 1057: free(conn_hash_hex);
1.408 djm 1058:
1059: if (config_test) {
1060: dump_client_config(&options, host);
1061: exit(0);
1062: }
1.405 djm 1063:
1.312 djm 1064: if (muxclient_command != 0 && options.control_path == NULL)
1.240 djm 1065: fatal("No ControlPath specified for \"-O\" command");
1.242 djm 1066: if (options.control_path != NULL)
1.312 djm 1067: muxclient(options.control_path);
1.401 djm 1068:
1069: /*
1070: * If hostname canonicalisation was not enabled, then we may not
1071: * have yet resolved the hostname. Do so now.
1072: */
1073: if (addrs == NULL && options.proxy_command == NULL) {
1074: if ((addrs = resolve_host(host, options.port, 1,
1075: cname, sizeof(cname))) == NULL)
1076: cleanup_exit(255); /* resolve_host logs the error */
1077: }
1.214 djm 1078:
1.303 djm 1079: timeout_ms = options.connection_timeout * 1000;
1080:
1.77 markus 1081: /* Open a connection to the remote host. */
1.385 djm 1082: if (ssh_connect(host, addrs, &hostaddr, options.port,
1083: options.address_family, options.connection_attempts,
1084: &timeout_ms, options.tcp_keep_alive,
1.388 djm 1085: options.use_privileged_port) != 0)
1.257 dtucker 1086: exit(255);
1.31 markus 1087:
1.391 djm 1088: if (addrs != NULL)
1089: freeaddrinfo(addrs);
1090:
1.385 djm 1091: packet_set_timeout(options.server_alive_interval,
1092: options.server_alive_count_max);
1093:
1.303 djm 1094: if (timeout_ms > 0)
1095: debug3("timeout: %d ms remain after connect", timeout_ms);
1096:
1.33 markus 1097: /*
1098: * If we successfully made the connection, load the host private key
1099: * in case we will need it later for combined rsa-rhosts
1100: * authentication. This must be done before releasing extra
1101: * privileges, because the file is only readable by root.
1.174 markus 1102: * If we cannot access the private keys, load the public keys
1103: * instead and try to execute the ssh-keysign helper instead.
1.33 markus 1104: */
1.112 markus 1105: sensitive_data.nkeys = 0;
1106: sensitive_data.keys = NULL;
1.173 markus 1107: sensitive_data.external_keysign = 0;
1.178 markus 1108: if (options.rhosts_rsa_authentication ||
1109: options.hostbased_authentication) {
1.397 djm 1110: sensitive_data.nkeys = 9;
1.274 deraadt 1111: sensitive_data.keys = xcalloc(sensitive_data.nkeys,
1.180 deraadt 1112: sizeof(Key));
1.177 markus 1113:
1114: PRIV_START;
1.112 markus 1115: sensitive_data.keys[0] = key_load_private_type(KEY_RSA1,
1.276 dtucker 1116: _PATH_HOST_KEY_FILE, "", NULL, NULL);
1.411 djm 1117: sensitive_data.keys[1] = key_load_private_cert(KEY_ECDSA,
1.349 djm 1118: _PATH_HOST_ECDSA_KEY_FILE, "", NULL);
1.411 djm 1119: sensitive_data.keys[2] = key_load_private_cert(KEY_ED25519,
1120: _PATH_HOST_ED25519_KEY_FILE, "", NULL);
1.349 djm 1121: sensitive_data.keys[3] = key_load_private_cert(KEY_RSA,
1.345 djm 1122: _PATH_HOST_RSA_KEY_FILE, "", NULL);
1.411 djm 1123: sensitive_data.keys[4] = key_load_private_cert(KEY_DSA,
1124: _PATH_HOST_DSA_KEY_FILE, "", NULL);
1125: sensitive_data.keys[5] = key_load_private_type(KEY_ECDSA,
1.349 djm 1126: _PATH_HOST_ECDSA_KEY_FILE, "", NULL, NULL);
1.411 djm 1127: sensitive_data.keys[6] = key_load_private_type(KEY_ED25519,
1128: _PATH_HOST_ED25519_KEY_FILE, "", NULL, NULL);
1.397 djm 1129: sensitive_data.keys[7] = key_load_private_type(KEY_RSA,
1.276 dtucker 1130: _PATH_HOST_RSA_KEY_FILE, "", NULL, NULL);
1.411 djm 1131: sensitive_data.keys[8] = key_load_private_type(KEY_DSA,
1132: _PATH_HOST_DSA_KEY_FILE, "", NULL, NULL);
1.177 markus 1133: PRIV_END;
1.173 markus 1134:
1.181 markus 1135: if (options.hostbased_authentication == 1 &&
1136: sensitive_data.keys[0] == NULL &&
1.349 djm 1137: sensitive_data.keys[5] == NULL &&
1.396 markus 1138: sensitive_data.keys[6] == NULL &&
1.397 djm 1139: sensitive_data.keys[7] == NULL &&
1140: sensitive_data.keys[8] == NULL) {
1.345 djm 1141: sensitive_data.keys[1] = key_load_cert(
1.411 djm 1142: _PATH_HOST_ECDSA_KEY_FILE);
1.345 djm 1143: sensitive_data.keys[2] = key_load_cert(
1.411 djm 1144: _PATH_HOST_ED25519_KEY_FILE);
1.349 djm 1145: sensitive_data.keys[3] = key_load_cert(
1.345 djm 1146: _PATH_HOST_RSA_KEY_FILE);
1.397 djm 1147: sensitive_data.keys[4] = key_load_cert(
1.411 djm 1148: _PATH_HOST_DSA_KEY_FILE);
1.397 djm 1149: sensitive_data.keys[5] = key_load_public(
1.411 djm 1150: _PATH_HOST_ECDSA_KEY_FILE, NULL);
1.397 djm 1151: sensitive_data.keys[6] = key_load_public(
1.411 djm 1152: _PATH_HOST_ED25519_KEY_FILE, NULL);
1.397 djm 1153: sensitive_data.keys[7] = key_load_public(
1.173 markus 1154: _PATH_HOST_RSA_KEY_FILE, NULL);
1.397 djm 1155: sensitive_data.keys[8] = key_load_public(
1.411 djm 1156: _PATH_HOST_DSA_KEY_FILE, NULL);
1.173 markus 1157: sensitive_data.external_keysign = 1;
1158: }
1.31 markus 1159: }
1.33 markus 1160: /*
1161: * Get rid of any extra privileges that we may have. We will no
1162: * longer need them. Also, extra privileges could make it very hard
1163: * to read identity files and other non-world-readable files from the
1164: * user's home directory if it happens to be on a NFS volume where
1165: * root is mapped to nobody.
1166: */
1.225 dtucker 1167: if (original_effective_uid == 0) {
1168: PRIV_START;
1169: permanently_set_uid(pw);
1170: }
1.31 markus 1171:
1.33 markus 1172: /*
1173: * Now that we are back to our own permissions, create ~/.ssh
1.254 djm 1174: * directory if it doesn't already exist.
1.33 markus 1175: */
1.367 djm 1176: if (config == NULL) {
1177: r = snprintf(buf, sizeof buf, "%s%s%s", pw->pw_dir,
1178: strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR);
1179: if (r > 0 && (size_t)r < sizeof(buf) && stat(buf, &st) < 0)
1180: if (mkdir(buf, 0700) < 0)
1181: error("Could not create directory '%.200s'.",
1182: buf);
1183: }
1.31 markus 1184:
1.104 markus 1185: /* load options.identity_files */
1186: load_public_identity_files();
1187:
1188: /* Expand ~ in known host file names. */
1.361 djm 1189: tilde_expand_paths(options.system_hostfiles,
1190: options.num_system_hostfiles);
1191: tilde_expand_paths(options.user_hostfiles, options.num_user_hostfiles);
1.149 markus 1192:
1193: signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
1.352 djm 1194: signal(SIGCHLD, main_sigchld_handler);
1.31 markus 1195:
1.316 djm 1196: /* Log into the remote system. Never returns if the login fails. */
1.303 djm 1197: ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr,
1.355 djm 1198: options.port, pw, timeout_ms);
1.339 djm 1199:
1200: if (packet_connection_is_on_socket()) {
1201: verbose("Authenticated to %s ([%s]:%d).", host,
1202: get_remote_ipaddr(), get_remote_port());
1203: } else {
1204: verbose("Authenticated to %s (via proxy).", host);
1205: }
1.31 markus 1206:
1.112 markus 1207: /* We no longer need the private host keys. Clear them now. */
1208: if (sensitive_data.nkeys != 0) {
1209: for (i = 0; i < sensitive_data.nkeys; i++) {
1210: if (sensitive_data.keys[i] != NULL) {
1211: /* Destroys contents safely */
1212: debug3("clear hostkey %d", i);
1213: key_free(sensitive_data.keys[i]);
1214: sensitive_data.keys[i] = NULL;
1215: }
1216: }
1.378 djm 1217: free(sensitive_data.keys);
1.134 markus 1218: }
1219: for (i = 0; i < options.num_identity_files; i++) {
1.378 djm 1220: free(options.identity_files[i]);
1221: options.identity_files[i] = NULL;
1.134 markus 1222: if (options.identity_keys[i]) {
1223: key_free(options.identity_keys[i]);
1224: options.identity_keys[i] = NULL;
1225: }
1.112 markus 1226: }
1.31 markus 1227:
1.45 markus 1228: exit_status = compat20 ? ssh_session2() : ssh_session();
1229: packet_close();
1.186 djm 1230:
1.312 djm 1231: if (options.control_path != NULL && muxserver_sock != -1)
1.214 djm 1232: unlink(options.control_path);
1233:
1.353 djm 1234: /* Kill ProxyCommand if it is running. */
1235: ssh_kill_proxy_command();
1.186 djm 1236:
1.45 markus 1237: return exit_status;
1238: }
1239:
1.344 djm 1240: static void
1241: control_persist_detach(void)
1242: {
1243: pid_t pid;
1.346 djm 1244: int devnull;
1.344 djm 1245:
1246: debug("%s: backgrounding master process", __func__);
1247:
1248: /*
1249: * master (current process) into the background, and make the
1250: * foreground process a client of the backgrounded master.
1251: */
1252: switch ((pid = fork())) {
1253: case -1:
1254: fatal("%s: fork: %s", __func__, strerror(errno));
1255: case 0:
1256: /* Child: master process continues mainloop */
1257: break;
1258: default:
1259: /* Parent: set up mux slave to connect to backgrounded master */
1260: debug2("%s: background process is %ld", __func__, (long)pid);
1261: stdin_null_flag = ostdin_null_flag;
1.359 djm 1262: options.request_tty = orequest_tty;
1.344 djm 1263: tty_flag = otty_flag;
1264: close(muxserver_sock);
1265: muxserver_sock = -1;
1.351 markus 1266: options.control_master = SSHCTL_MASTER_NO;
1.344 djm 1267: muxclient(options.control_path);
1268: /* muxclient() doesn't return on success. */
1269: fatal("Failed to connect to new control master");
1270: }
1.346 djm 1271: if ((devnull = open(_PATH_DEVNULL, O_RDWR)) == -1) {
1272: error("%s: open(\"/dev/null\"): %s", __func__,
1273: strerror(errno));
1274: } else {
1275: if (dup2(devnull, STDIN_FILENO) == -1 ||
1276: dup2(devnull, STDOUT_FILENO) == -1)
1277: error("%s: dup2: %s", __func__, strerror(errno));
1278: if (devnull > STDERR_FILENO)
1279: close(devnull);
1280: }
1.381 djm 1281: daemon(1, 1);
1.362 djm 1282: setproctitle("%s [mux]", options.control_path);
1.344 djm 1283: }
1284:
1285: /* Do fork() after authentication. Used by "ssh -f" */
1286: static void
1287: fork_postauth(void)
1288: {
1289: if (need_controlpersist_detach)
1290: control_persist_detach();
1291: debug("forking to background");
1292: fork_after_authentication_flag = 0;
1293: if (daemon(1, 1) < 0)
1294: fatal("daemon() failed: %.200s", strerror(errno));
1295: }
1296:
1.315 djm 1297: /* Callback for remote forward global requests */
1298: static void
1299: ssh_confirm_remote_forward(int type, u_int32_t seq, void *ctxt)
1300: {
1.406 millert 1301: struct Forward *rfwd = (struct Forward *)ctxt;
1.315 djm 1302:
1.324 djm 1303: /* XXX verbose() on failure? */
1.404 markus 1304: debug("remote forward %s for: listen %s%s%d, connect %s:%d",
1.315 djm 1305: type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
1.406 millert 1306: rfwd->listen_path ? rfwd->listen_path :
1307: rfwd->listen_host ? rfwd->listen_host : "",
1308: (rfwd->listen_path || rfwd->listen_host) ? ":" : "",
1309: rfwd->listen_port, rfwd->connect_path ? rfwd->connect_path :
1310: rfwd->connect_host, rfwd->connect_port);
1311: if (rfwd->listen_path == NULL && rfwd->listen_port == 0) {
1.366 markus 1312: if (type == SSH2_MSG_REQUEST_SUCCESS) {
1313: rfwd->allocated_port = packet_get_int();
1314: logit("Allocated port %u for remote forward to %s:%d",
1315: rfwd->allocated_port,
1316: rfwd->connect_host, rfwd->connect_port);
1317: channel_update_permitted_opens(rfwd->handle,
1318: rfwd->allocated_port);
1319: } else {
1320: channel_update_permitted_opens(rfwd->handle, -1);
1321: }
1.324 djm 1322: }
1323:
1.315 djm 1324: if (type == SSH2_MSG_REQUEST_FAILURE) {
1.406 millert 1325: if (options.exit_on_forward_failure) {
1326: if (rfwd->listen_path != NULL)
1327: fatal("Error: remote port forwarding failed "
1328: "for listen path %s", rfwd->listen_path);
1329: else
1330: fatal("Error: remote port forwarding failed "
1331: "for listen port %d", rfwd->listen_port);
1332: } else {
1333: if (rfwd->listen_path != NULL)
1334: logit("Warning: remote port forwarding failed "
1335: "for listen path %s", rfwd->listen_path);
1336: else
1337: logit("Warning: remote port forwarding failed "
1338: "for listen port %d", rfwd->listen_port);
1339: }
1.315 djm 1340: }
1.318 djm 1341: if (++remote_forward_confirms_received == options.num_remote_forwards) {
1.315 djm 1342: debug("All remote forwarding requests processed");
1.344 djm 1343: if (fork_after_authentication_flag)
1344: fork_postauth();
1.318 djm 1345: }
1.315 djm 1346: }
1347:
1.126 itojun 1348: static void
1.331 dtucker 1349: client_cleanup_stdio_fwd(int id, void *arg)
1350: {
1351: debug("stdio forwarding: done");
1352: cleanup_exit(0);
1353: }
1354:
1.368 djm 1355: static void
1.407 djm 1356: ssh_stdio_confirm(int id, int success, void *arg)
1357: {
1358: if (!success)
1359: fatal("stdio forwarding failed");
1360: }
1361:
1362: static void
1.368 djm 1363: ssh_init_stdio_forwarding(void)
1.331 dtucker 1364: {
1365: Channel *c;
1.332 djm 1366: int in, out;
1.331 dtucker 1367:
1.368 djm 1368: if (stdio_forward_host == NULL)
1369: return;
1.384 djm 1370: if (!compat20)
1.368 djm 1371: fatal("stdio forwarding require Protocol 2");
1372:
1373: debug3("%s: %s:%d", __func__, stdio_forward_host, stdio_forward_port);
1.332 djm 1374:
1.368 djm 1375: if ((in = dup(STDIN_FILENO)) < 0 ||
1376: (out = dup(STDOUT_FILENO)) < 0)
1.332 djm 1377: fatal("channel_connect_stdio_fwd: dup() in/out failed");
1.368 djm 1378: if ((c = channel_connect_stdio_fwd(stdio_forward_host,
1379: stdio_forward_port, in, out)) == NULL)
1380: fatal("%s: channel_connect_stdio_fwd failed", __func__);
1.331 dtucker 1381: channel_register_cleanup(c->self, client_cleanup_stdio_fwd, 0);
1.407 djm 1382: channel_register_open_confirm(c->self, ssh_stdio_confirm, NULL);
1.331 dtucker 1383: }
1384:
1385: static void
1.70 markus 1386: ssh_init_forwarding(void)
1387: {
1.86 markus 1388: int success = 0;
1.70 markus 1389: int i;
1.331 dtucker 1390:
1.70 markus 1391: /* Initiate local TCP/IP port forwardings. */
1392: for (i = 0; i < options.num_local_forwards; i++) {
1.232 djm 1393: debug("Local connections to %.200s:%d forwarded to remote "
1394: "address %.200s:%d",
1.406 millert 1395: (options.local_forwards[i].listen_path != NULL) ?
1396: options.local_forwards[i].listen_path :
1.234 deraadt 1397: (options.local_forwards[i].listen_host == NULL) ?
1.406 millert 1398: (options.fwd_opts.gateway_ports ? "*" : "LOCALHOST") :
1.232 djm 1399: options.local_forwards[i].listen_host,
1400: options.local_forwards[i].listen_port,
1.406 millert 1401: (options.local_forwards[i].connect_path != NULL) ?
1402: options.local_forwards[i].connect_path :
1.232 djm 1403: options.local_forwards[i].connect_host,
1404: options.local_forwards[i].connect_port);
1.158 markus 1405: success += channel_setup_local_fwd_listener(
1.406 millert 1406: &options.local_forwards[i], &options.fwd_opts);
1.70 markus 1407: }
1.283 markus 1408: if (i > 0 && success != i && options.exit_on_forward_failure)
1409: fatal("Could not request local forwarding.");
1.86 markus 1410: if (i > 0 && success == 0)
1411: error("Could not request local forwarding.");
1.70 markus 1412:
1413: /* Initiate remote TCP/IP port forwardings. */
1414: for (i = 0; i < options.num_remote_forwards; i++) {
1.232 djm 1415: debug("Remote connections from %.200s:%d forwarded to "
1416: "local address %.200s:%d",
1.406 millert 1417: (options.remote_forwards[i].listen_path != NULL) ?
1418: options.remote_forwards[i].listen_path :
1.248 djm 1419: (options.remote_forwards[i].listen_host == NULL) ?
1.253 djm 1420: "LOCALHOST" : options.remote_forwards[i].listen_host,
1.232 djm 1421: options.remote_forwards[i].listen_port,
1.406 millert 1422: (options.remote_forwards[i].connect_path != NULL) ?
1423: options.remote_forwards[i].connect_path :
1.232 djm 1424: options.remote_forwards[i].connect_host,
1425: options.remote_forwards[i].connect_port);
1.366 markus 1426: options.remote_forwards[i].handle =
1427: channel_request_remote_forwarding(
1.406 millert 1428: &options.remote_forwards[i]);
1.366 markus 1429: if (options.remote_forwards[i].handle < 0) {
1.283 markus 1430: if (options.exit_on_forward_failure)
1431: fatal("Could not request remote forwarding.");
1432: else
1433: logit("Warning: Could not request remote "
1434: "forwarding.");
1.366 markus 1435: } else {
1436: client_register_global_confirm(ssh_confirm_remote_forward,
1437: &options.remote_forwards[i]);
1.283 markus 1438: }
1.70 markus 1439: }
1.301 djm 1440:
1441: /* Initiate tunnel forwarding. */
1442: if (options.tun_open != SSH_TUNMODE_NO) {
1443: if (client_request_tun_fwd(options.tun_open,
1444: options.tun_local, options.tun_remote) == -1) {
1445: if (options.exit_on_forward_failure)
1446: fatal("Could not request tunnel forwarding.");
1447: else
1448: error("Could not request tunnel forwarding.");
1449: }
1450: }
1.70 markus 1451: }
1452:
1.126 itojun 1453: static void
1.70 markus 1454: check_agent_present(void)
1455: {
1.412 ! djm 1456: int r;
! 1457:
1.70 markus 1458: if (options.forward_agent) {
1.254 djm 1459: /* Clear agent forwarding if we don't have an agent. */
1.412 ! djm 1460: if ((r = ssh_get_authentication_socket(NULL)) != 0) {
1.70 markus 1461: options.forward_agent = 0;
1.412 ! djm 1462: if (r != SSH_ERR_AGENT_NOT_PRESENT)
! 1463: debug("ssh_get_authentication_socket: %s",
! 1464: ssh_err(r));
! 1465: }
1.70 markus 1466: }
1467: }
1468:
1.126 itojun 1469: static int
1.45 markus 1470: ssh_session(void)
1471: {
1472: int type;
1473: int interactive = 0;
1474: int have_tty = 0;
1475: struct winsize ws;
1476: char *cp;
1.243 djm 1477: const char *display;
1.45 markus 1478:
1.31 markus 1479: /* Enable compression if requested. */
1480: if (options.compression) {
1.316 djm 1481: debug("Requesting compression at level %d.",
1482: options.compression_level);
1.31 markus 1483:
1.316 djm 1484: if (options.compression_level < 1 ||
1485: options.compression_level > 9)
1486: fatal("Compression level must be from 1 (fast) to "
1487: "9 (slow, best).");
1.31 markus 1488:
1489: /* Send the request. */
1490: packet_start(SSH_CMSG_REQUEST_COMPRESSION);
1491: packet_put_int(options.compression_level);
1492: packet_send();
1493: packet_write_wait();
1.156 markus 1494: type = packet_read();
1.31 markus 1495: if (type == SSH_SMSG_SUCCESS)
1496: packet_start_compression(options.compression_level);
1497: else if (type == SSH_SMSG_FAILURE)
1.191 itojun 1498: logit("Warning: Remote host refused compression.");
1.31 markus 1499: else
1.316 djm 1500: packet_disconnect("Protocol error waiting for "
1501: "compression response.");
1.31 markus 1502: }
1503: /* Allocate a pseudo tty if appropriate. */
1504: if (tty_flag) {
1505: debug("Requesting pty.");
1506:
1507: /* Start the packet. */
1508: packet_start(SSH_CMSG_REQUEST_PTY);
1509:
1510: /* Store TERM in the packet. There is no limit on the
1511: length of the string. */
1512: cp = getenv("TERM");
1513: if (!cp)
1514: cp = "";
1.124 markus 1515: packet_put_cstring(cp);
1.31 markus 1516:
1517: /* Store window size in the packet. */
1518: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
1519: memset(&ws, 0, sizeof(ws));
1.269 deraadt 1520: packet_put_int((u_int)ws.ws_row);
1521: packet_put_int((u_int)ws.ws_col);
1522: packet_put_int((u_int)ws.ws_xpixel);
1523: packet_put_int((u_int)ws.ws_ypixel);
1.31 markus 1524:
1525: /* Store tty modes in the packet. */
1.115 stevesk 1526: tty_make_modes(fileno(stdin), NULL);
1.31 markus 1527:
1528: /* Send the packet, and wait for it to leave. */
1529: packet_send();
1530: packet_write_wait();
1531:
1532: /* Read response from the server. */
1.156 markus 1533: type = packet_read();
1.43 markus 1534: if (type == SSH_SMSG_SUCCESS) {
1.31 markus 1535: interactive = 1;
1.45 markus 1536: have_tty = 1;
1.43 markus 1537: } else if (type == SSH_SMSG_FAILURE)
1.316 djm 1538: logit("Warning: Remote host failed or refused to "
1539: "allocate a pseudo tty.");
1.31 markus 1540: else
1.316 djm 1541: packet_disconnect("Protocol error waiting for pty "
1542: "request response.");
1.31 markus 1543: }
1544: /* Request X11 forwarding if enabled and DISPLAY is set. */
1.243 djm 1545: display = getenv("DISPLAY");
1546: if (options.forward_x11 && display != NULL) {
1.150 stevesk 1547: char *proto, *data;
1.50 markus 1548: /* Get reasonable local authentication information. */
1.243 djm 1549: client_x11_get_proto(display, options.xauth_location,
1.384 djm 1550: options.forward_x11_trusted,
1.340 djm 1551: options.forward_x11_timeout,
1552: &proto, &data);
1.50 markus 1553: /* Request forwarding with authentication spoofing. */
1.316 djm 1554: debug("Requesting X11 forwarding with authentication "
1555: "spoofing.");
1.363 djm 1556: x11_request_forwarding_with_spoofing(0, display, proto,
1557: data, 0);
1.31 markus 1558: /* Read response from the server. */
1.156 markus 1559: type = packet_read();
1.31 markus 1560: if (type == SSH_SMSG_SUCCESS) {
1561: interactive = 1;
1.50 markus 1562: } else if (type == SSH_SMSG_FAILURE) {
1.191 itojun 1563: logit("Warning: Remote host denied X11 forwarding.");
1.50 markus 1564: } else {
1.316 djm 1565: packet_disconnect("Protocol error waiting for X11 "
1566: "forwarding");
1.50 markus 1567: }
1.31 markus 1568: }
1569: /* Tell the packet module whether this is an interactive session. */
1.354 djm 1570: packet_set_interactive(interactive,
1571: options.ip_qos_interactive, options.ip_qos_bulk);
1.31 markus 1572:
1573: /* Request authentication agent forwarding if appropriate. */
1.70 markus 1574: check_agent_present();
1575:
1.31 markus 1576: if (options.forward_agent) {
1577: debug("Requesting authentication agent forwarding.");
1578: auth_request_forwarding();
1579:
1580: /* Read response from the server. */
1.156 markus 1581: type = packet_read();
1.155 markus 1582: packet_check_eom();
1.31 markus 1583: if (type != SSH_SMSG_SUCCESS)
1.191 itojun 1584: logit("Warning: Remote host denied authentication agent forwarding.");
1.31 markus 1585: }
1586:
1.70 markus 1587: /* Initiate port forwardings. */
1.368 djm 1588: ssh_init_stdio_forwarding();
1.70 markus 1589: ssh_init_forwarding();
1.305 dtucker 1590:
1591: /* Execute a local command */
1592: if (options.local_command != NULL &&
1593: options.permit_local_command)
1594: ssh_local_cmd(options.local_command);
1.34 markus 1595:
1.318 djm 1596: /*
1597: * If requested and we are not interested in replies to remote
1598: * forwarding requests, then let ssh continue in the background.
1599: */
1.344 djm 1600: if (fork_after_authentication_flag) {
1601: if (options.exit_on_forward_failure &&
1602: options.num_remote_forwards > 0) {
1603: debug("deferring postauth fork until remote forward "
1604: "confirmation received");
1605: } else
1606: fork_postauth();
1.318 djm 1607: }
1.31 markus 1608:
1.33 markus 1609: /*
1610: * If a command was specified on the command line, execute the
1611: * command now. Otherwise request the server to start a shell.
1612: */
1.31 markus 1613: if (buffer_len(&command) > 0) {
1614: int len = buffer_len(&command);
1615: if (len > 900)
1616: len = 900;
1.316 djm 1617: debug("Sending command: %.*s", len,
1618: (u_char *)buffer_ptr(&command));
1.31 markus 1619: packet_start(SSH_CMSG_EXEC_CMD);
1620: packet_put_string(buffer_ptr(&command), buffer_len(&command));
1621: packet_send();
1622: packet_write_wait();
1623: } else {
1624: debug("Requesting shell.");
1625: packet_start(SSH_CMSG_EXEC_SHELL);
1626: packet_send();
1627: packet_write_wait();
1628: }
1629:
1630: /* Enter the interactive session. */
1.119 stevesk 1631: return client_loop(have_tty, tty_flag ?
1632: options.escape_char : SSH_ESCAPECHAR_NONE, 0);
1.89 markus 1633: }
1634:
1.214 djm 1635: /* request pty/x11/agent/tcpfwd/shell for channel */
1636: static void
1.337 djm 1637: ssh_session2_setup(int id, int success, void *arg)
1.214 djm 1638: {
1.215 djm 1639: extern char **environ;
1.243 djm 1640: const char *display;
1641: int interactive = tty_flag;
1.337 djm 1642:
1643: if (!success)
1644: return; /* No need for error message, channels code sens one */
1.215 djm 1645:
1.248 djm 1646: display = getenv("DISPLAY");
1.243 djm 1647: if (options.forward_x11 && display != NULL) {
1.150 stevesk 1648: char *proto, *data;
1.50 markus 1649: /* Get reasonable local authentication information. */
1.243 djm 1650: client_x11_get_proto(display, options.xauth_location,
1.340 djm 1651: options.forward_x11_trusted,
1652: options.forward_x11_timeout, &proto, &data);
1.50 markus 1653: /* Request forwarding with authentication spoofing. */
1.316 djm 1654: debug("Requesting X11 forwarding with authentication "
1655: "spoofing.");
1.363 djm 1656: x11_request_forwarding_with_spoofing(id, display, proto,
1657: data, 1);
1658: client_expect_confirm(id, "X11 forwarding", CONFIRM_WARN);
1659: /* XXX exit_on_forward_failure */
1.80 markus 1660: interactive = 1;
1.50 markus 1661: }
1662:
1.70 markus 1663: check_agent_present();
1664: if (options.forward_agent) {
1665: debug("Requesting authentication agent forwarding.");
1666: channel_request_start(id, "auth-agent-req@openssh.com", 0);
1667: packet_send();
1.212 djm 1668: }
1.369 dtucker 1669:
1670: /* Tell the packet module whether this is an interactive session. */
1671: packet_set_interactive(interactive,
1672: options.ip_qos_interactive, options.ip_qos_bulk);
1.212 djm 1673:
1.214 djm 1674: client_session2_setup(id, tty_flag, subsystem_flag, getenv("TERM"),
1.311 djm 1675: NULL, fileno(stdin), &command, environ);
1.45 markus 1676: }
1677:
1.143 markus 1678: /* open new channel for a session */
1.126 itojun 1679: static int
1.143 markus 1680: ssh_session2_open(void)
1.45 markus 1681: {
1.118 markus 1682: Channel *c;
1683: int window, packetmax, in, out, err;
1.60 markus 1684:
1.62 markus 1685: if (stdin_null_flag) {
1.93 itojun 1686: in = open(_PATH_DEVNULL, O_RDONLY);
1.62 markus 1687: } else {
1688: in = dup(STDIN_FILENO);
1689: }
1.60 markus 1690: out = dup(STDOUT_FILENO);
1691: err = dup(STDERR_FILENO);
1.45 markus 1692:
1693: if (in < 0 || out < 0 || err < 0)
1.62 markus 1694: fatal("dup() in/out/err failed");
1.45 markus 1695:
1.69 markus 1696: /* enable nonblocking unless tty */
1697: if (!isatty(in))
1698: set_nonblock(in);
1699: if (!isatty(out))
1700: set_nonblock(out);
1701: if (!isatty(err))
1702: set_nonblock(err);
1703:
1.65 markus 1704: window = CHAN_SES_WINDOW_DEFAULT;
1705: packetmax = CHAN_SES_PACKET_DEFAULT;
1.164 markus 1706: if (tty_flag) {
1707: window >>= 1;
1708: packetmax >>= 1;
1.45 markus 1709: }
1.118 markus 1710: c = channel_new(
1.45 markus 1711: "session", SSH_CHANNEL_OPENING, in, out, err,
1.65 markus 1712: window, packetmax, CHAN_EXTENDED_WRITE,
1.192 markus 1713: "client-session", /*nonblock*/0);
1.45 markus 1714:
1.143 markus 1715: debug3("ssh_session2_open: channel_new: %d", c->self);
1.106 markus 1716:
1.122 markus 1717: channel_send_open(c->self);
1.143 markus 1718: if (!no_shell_flag)
1.310 djm 1719: channel_register_open_confirm(c->self,
1720: ssh_session2_setup, NULL);
1.106 markus 1721:
1.118 markus 1722: return c->self;
1.106 markus 1723: }
1724:
1.126 itojun 1725: static int
1.106 markus 1726: ssh_session2(void)
1727: {
1.143 markus 1728: int id = -1;
1.106 markus 1729:
1730: /* XXX should be pre-session */
1.368 djm 1731: if (!options.control_persist)
1732: ssh_init_stdio_forwarding();
1.106 markus 1733: ssh_init_forwarding();
1734:
1.344 djm 1735: /* Start listening for multiplex clients */
1736: muxserver_listen();
1737:
1738: /*
1.368 djm 1739: * If we are in control persist mode and have a working mux listen
1740: * socket, then prepare to background ourselves and have a foreground
1741: * client attach as a control slave.
1742: * NB. we must save copies of the flags that we override for
1.344 djm 1743: * the backgrounding, since we defer attachment of the slave until
1744: * after the connection is fully established (in particular,
1745: * async rfwd replies have been received for ExitOnForwardFailure).
1746: */
1747: if (options.control_persist && muxserver_sock != -1) {
1748: ostdin_null_flag = stdin_null_flag;
1749: ono_shell_flag = no_shell_flag;
1.359 djm 1750: orequest_tty = options.request_tty;
1.344 djm 1751: otty_flag = tty_flag;
1752: stdin_null_flag = 1;
1753: no_shell_flag = 1;
1754: tty_flag = 0;
1755: if (!fork_after_authentication_flag)
1756: need_controlpersist_detach = 1;
1757: fork_after_authentication_flag = 1;
1758: }
1.368 djm 1759: /*
1760: * ControlPersist mux listen socket setup failed, attempt the
1761: * stdio forward setup that we skipped earlier.
1762: */
1763: if (options.control_persist && muxserver_sock == -1)
1764: ssh_init_stdio_forwarding();
1.344 djm 1765:
1.143 markus 1766: if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN))
1767: id = ssh_session2_open();
1.379 djm 1768: else {
1769: packet_set_interactive(
1770: options.control_master == SSHCTL_MASTER_NO,
1771: options.ip_qos_interactive, options.ip_qos_bulk);
1772: }
1.314 djm 1773:
1774: /* If we don't expect to open a new session, then disallow it */
1.319 markus 1775: if (options.control_master == SSHCTL_MASTER_NO &&
1776: (datafellows & SSH_NEW_OPENSSH)) {
1.314 djm 1777: debug("Requesting no-more-sessions@openssh.com");
1778: packet_start(SSH2_MSG_GLOBAL_REQUEST);
1779: packet_put_cstring("no-more-sessions@openssh.com");
1780: packet_put_char(0);
1781: packet_send();
1782: }
1.255 reyk 1783:
1784: /* Execute a local command */
1785: if (options.local_command != NULL &&
1786: options.permit_local_command)
1787: ssh_local_cmd(options.local_command);
1.301 djm 1788:
1.342 djm 1789: /*
1790: * If requested and we are not interested in replies to remote
1791: * forwarding requests, then let ssh continue in the background.
1792: */
1.344 djm 1793: if (fork_after_authentication_flag) {
1794: if (options.exit_on_forward_failure &&
1795: options.num_remote_forwards > 0) {
1796: debug("deferring postauth fork until remote forward "
1797: "confirmation received");
1798: } else
1799: fork_postauth();
1.318 djm 1800: }
1.327 andreas 1801:
1802: if (options.use_roaming)
1803: request_roaming();
1.31 markus 1804:
1.119 stevesk 1805: return client_loop(tty_flag, tty_flag ?
1806: options.escape_char : SSH_ESCAPECHAR_NONE, id);
1.72 markus 1807: }
1808:
1.126 itojun 1809: static void
1.104 markus 1810: load_public_identity_files(void)
1811: {
1.275 djm 1812: char *filename, *cp, thishost[NI_MAXHOST];
1.306 deraadt 1813: char *pwdir = NULL, *pwname = NULL;
1.167 markus 1814: int i = 0;
1.104 markus 1815: Key *public;
1.275 djm 1816: struct passwd *pw;
1.335 djm 1817: u_int n_ids;
1818: char *identity_files[SSH_MAX_IDENTITY_FILES];
1819: Key *identity_keys[SSH_MAX_IDENTITY_FILES];
1.333 markus 1820: #ifdef ENABLE_PKCS11
1.167 markus 1821: Key **keys;
1.333 markus 1822: int nkeys;
1.335 djm 1823: #endif /* PKCS11 */
1.104 markus 1824:
1.335 djm 1825: n_ids = 0;
1.398 tedu 1826: memset(identity_files, 0, sizeof(identity_files));
1827: memset(identity_keys, 0, sizeof(identity_keys));
1.335 djm 1828:
1829: #ifdef ENABLE_PKCS11
1.333 markus 1830: if (options.pkcs11_provider != NULL &&
1.167 markus 1831: options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
1.333 markus 1832: (pkcs11_init(!options.batch_mode) == 0) &&
1833: (nkeys = pkcs11_add_provider(options.pkcs11_provider, NULL,
1834: &keys)) > 0) {
1835: for (i = 0; i < nkeys; i++) {
1.335 djm 1836: if (n_ids >= SSH_MAX_IDENTITY_FILES) {
1837: key_free(keys[i]);
1838: continue;
1839: }
1840: identity_keys[n_ids] = keys[i];
1841: identity_files[n_ids] =
1.333 markus 1842: xstrdup(options.pkcs11_provider); /* XXX */
1.335 djm 1843: n_ids++;
1.167 markus 1844: }
1.378 djm 1845: free(keys);
1.127 markus 1846: }
1.333 markus 1847: #endif /* ENABLE_PKCS11 */
1.275 djm 1848: if ((pw = getpwuid(original_real_uid)) == NULL)
1849: fatal("load_public_identity_files: getpwuid failed");
1.307 dtucker 1850: pwname = xstrdup(pw->pw_name);
1851: pwdir = xstrdup(pw->pw_dir);
1.275 djm 1852: if (gethostname(thishost, sizeof(thishost)) == -1)
1853: fatal("load_public_identity_files: gethostname: %s",
1854: strerror(errno));
1.335 djm 1855: for (i = 0; i < options.num_identity_files; i++) {
1.373 djm 1856: if (n_ids >= SSH_MAX_IDENTITY_FILES ||
1857: strcasecmp(options.identity_files[i], "none") == 0) {
1.378 djm 1858: free(options.identity_files[i]);
1.335 djm 1859: continue;
1860: }
1.275 djm 1861: cp = tilde_expand_filename(options.identity_files[i],
1.131 millert 1862: original_real_uid);
1.306 deraadt 1863: filename = percent_expand(cp, "d", pwdir,
1864: "u", pwname, "l", thishost, "h", host,
1.275 djm 1865: "r", options.user, (char *)NULL);
1.378 djm 1866: free(cp);
1.131 millert 1867: public = key_load_public(filename, NULL);
1868: debug("identity file %s type %d", filename,
1869: public ? public->type : -1);
1.378 djm 1870: free(options.identity_files[i]);
1.335 djm 1871: identity_files[n_ids] = filename;
1872: identity_keys[n_ids] = public;
1873:
1874: if (++n_ids >= SSH_MAX_IDENTITY_FILES)
1875: continue;
1876:
1877: /* Try to add the certificate variant too */
1878: xasprintf(&cp, "%s-cert", filename);
1879: public = key_load_public(cp, NULL);
1880: debug("identity file %s type %d", cp,
1881: public ? public->type : -1);
1882: if (public == NULL) {
1.378 djm 1883: free(cp);
1.335 djm 1884: continue;
1885: }
1886: if (!key_is_cert(public)) {
1887: debug("%s: key %s type %s is not a certificate",
1888: __func__, cp, key_type(public));
1889: key_free(public);
1.378 djm 1890: free(cp);
1.335 djm 1891: continue;
1892: }
1893: identity_keys[n_ids] = public;
1894: /* point to the original path, most likely the private key */
1895: identity_files[n_ids] = xstrdup(filename);
1896: n_ids++;
1897: }
1898: options.num_identity_files = n_ids;
1899: memcpy(options.identity_files, identity_files, sizeof(identity_files));
1900: memcpy(options.identity_keys, identity_keys, sizeof(identity_keys));
1901:
1.398 tedu 1902: explicit_bzero(pwname, strlen(pwname));
1.378 djm 1903: free(pwname);
1.398 tedu 1904: explicit_bzero(pwdir, strlen(pwdir));
1.378 djm 1905: free(pwdir);
1.214 djm 1906: }
1.352 djm 1907:
1908: static void
1909: main_sigchld_handler(int sig)
1910: {
1911: int save_errno = errno;
1912: pid_t pid;
1913: int status;
1914:
1915: while ((pid = waitpid(-1, &status, WNOHANG)) > 0 ||
1916: (pid < 0 && errno == EINTR))
1917: ;
1918:
1919: signal(sig, main_sigchld_handler);
1920: errno = save_errno;
1921: }
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