Annotation of src/usr.bin/ssh/ssh.c, Revision 1.467
1.467 ! djm 1: /* $OpenBSD: ssh.c,v 1.466 2017/10/23 05:08:00 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>
45: #include <sys/queue.h>
1.259 stevesk 46: #include <sys/resource.h>
1.280 stevesk 47: #include <sys/socket.h>
1.264 stevesk 48: #include <sys/stat.h>
1.312 djm 49: #include <sys/time.h>
1.352 djm 50: #include <sys/wait.h>
1.258 stevesk 51:
1.265 stevesk 52: #include <ctype.h>
1.285 stevesk 53: #include <errno.h>
1.281 stevesk 54: #include <fcntl.h>
1.286 stevesk 55: #include <netdb.h>
1.258 stevesk 56: #include <paths.h>
1.279 stevesk 57: #include <pwd.h>
1.263 stevesk 58: #include <signal.h>
1.287 stevesk 59: #include <stddef.h>
1.291 stevesk 60: #include <stdio.h>
1.290 stevesk 61: #include <stdlib.h>
1.289 stevesk 62: #include <string.h>
1.288 stevesk 63: #include <unistd.h>
1.414 deraadt 64: #include <limits.h>
1.445 djm 65: #include <locale.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 "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"
1.278 stevesk 98: #include "version.h"
1.412 djm 99: #include "ssherr.h"
1.420 djm 100: #include "myproposal.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:
1.33 markus 139: /*
140: * General data structure for command line options and options configurable
141: * in configuration files. See readconf.h.
142: */
1.1 deraadt 143: Options options;
144:
1.139 markus 145: /* optional user configfile */
146: char *config = NULL;
147:
1.33 markus 148: /*
149: * Name of the host we are connecting to. This is the name given on the
150: * command line, or the HostName specified for the user-supplied name in a
151: * configuration file.
152: */
1.1 deraadt 153: char *host;
154:
1.466 djm 155: /* Various strings used to to percent_expand() arguments */
156: static char thishost[NI_MAXHOST], shorthost[NI_MAXHOST], portstr[NI_MAXSERV];
157: static char uidstr[32], *host_arg, *conn_hash_hex;
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,
1.459 jmc 188: "usage: ssh [-46AaCfGgKkMNnqsTtVvXxYy] [-b bind_address] [-c cipher_spec]\n"
1.375 dtucker 189: " [-D [bind_address:]port] [-E log_file] [-e escape_char]\n"
1.444 jmc 190: " [-F configfile] [-I pkcs11] [-i identity_file]\n"
191: " [-J [user@]host[:port]] [-L address] [-l login_name] [-m mac_spec]\n"
192: " [-O ctl_cmd] [-o option] [-p port] [-Q query_option] [-R address]\n"
193: " [-S ctl_path] [-W host:port] [-w local_tun[:remote_tun]]\n"
1.465 millert 194: " destination [command]\n"
1.208 markus 195: );
1.257 dtucker 196: exit(255);
1.1 deraadt 197: }
198:
1.466 djm 199: static int ssh_session2(struct ssh *, struct passwd *);
200: static void load_public_identity_files(struct passwd *);
1.352 djm 201: static void main_sigchld_handler(int);
1.312 djm 202:
1.361 djm 203: /* ~/ expand a list of paths. NB. assumes path[n] is heap-allocated. */
204: static void
205: tilde_expand_paths(char **paths, u_int num_paths)
206: {
207: u_int i;
208: char *cp;
209:
210: for (i = 0; i < num_paths; i++) {
211: cp = tilde_expand_filename(paths[i], original_real_uid);
1.378 djm 212: free(paths[i]);
1.361 djm 213: paths[i] = cp;
214: }
215: }
216:
1.400 djm 217: /*
218: * Attempt to resolve a host name / port to a set of addresses and
219: * optionally return any CNAMEs encountered along the way.
220: * Returns NULL on failure.
221: * NB. this function must operate with a options having undefined members.
222: */
1.385 djm 223: static struct addrinfo *
1.400 djm 224: resolve_host(const char *name, int port, int logerr, char *cname, size_t clen)
1.385 djm 225: {
226: char strport[NI_MAXSERV];
227: struct addrinfo hints, *res;
228: int gaierr, loglevel = SYSLOG_LEVEL_DEBUG1;
229:
1.400 djm 230: if (port <= 0)
231: port = default_ssh_port();
232:
1.427 djm 233: snprintf(strport, sizeof strport, "%d", port);
1.398 tedu 234: memset(&hints, 0, sizeof(hints));
1.400 djm 235: hints.ai_family = options.address_family == -1 ?
236: AF_UNSPEC : options.address_family;
1.385 djm 237: hints.ai_socktype = SOCK_STREAM;
238: if (cname != NULL)
239: hints.ai_flags = AI_CANONNAME;
240: if ((gaierr = getaddrinfo(name, strport, &hints, &res)) != 0) {
241: if (logerr || (gaierr != EAI_NONAME && gaierr != EAI_NODATA))
242: loglevel = SYSLOG_LEVEL_ERROR;
243: do_log2(loglevel, "%s: Could not resolve hostname %.100s: %s",
244: __progname, name, ssh_gai_strerror(gaierr));
245: return NULL;
246: }
247: if (cname != NULL && res->ai_canonname != NULL) {
248: if (strlcpy(cname, res->ai_canonname, clen) >= clen) {
249: error("%s: host \"%s\" cname \"%s\" too long (max %lu)",
250: __func__, name, res->ai_canonname, (u_long)clen);
251: if (clen > 0)
252: *cname = '\0';
253: }
254: }
255: return res;
256: }
257:
258: /*
1.413 djm 259: * Attempt to resolve a numeric host address / port to a single address.
260: * Returns a canonical address string.
261: * Returns NULL on failure.
262: * NB. this function must operate with a options having undefined members.
263: */
264: static struct addrinfo *
265: resolve_addr(const char *name, int port, char *caddr, size_t clen)
266: {
267: char addr[NI_MAXHOST], strport[NI_MAXSERV];
268: struct addrinfo hints, *res;
269: int gaierr;
270:
271: if (port <= 0)
272: port = default_ssh_port();
273: snprintf(strport, sizeof strport, "%u", port);
274: memset(&hints, 0, sizeof(hints));
275: hints.ai_family = options.address_family == -1 ?
276: AF_UNSPEC : options.address_family;
277: hints.ai_socktype = SOCK_STREAM;
278: hints.ai_flags = AI_NUMERICHOST|AI_NUMERICSERV;
279: if ((gaierr = getaddrinfo(name, strport, &hints, &res)) != 0) {
280: debug2("%s: could not resolve name %.100s as address: %s",
281: __func__, name, ssh_gai_strerror(gaierr));
282: return NULL;
283: }
284: if (res == NULL) {
285: debug("%s: getaddrinfo %.100s returned no addresses",
286: __func__, name);
287: return NULL;
288: }
289: if (res->ai_next != NULL) {
290: debug("%s: getaddrinfo %.100s returned multiple addresses",
291: __func__, name);
292: goto fail;
293: }
294: if ((gaierr = getnameinfo(res->ai_addr, res->ai_addrlen,
295: addr, sizeof(addr), NULL, 0, NI_NUMERICHOST)) != 0) {
296: debug("%s: Could not format address for name %.100s: %s",
297: __func__, name, ssh_gai_strerror(gaierr));
298: goto fail;
299: }
300: if (strlcpy(caddr, addr, clen) >= clen) {
301: error("%s: host \"%s\" addr \"%s\" too long (max %lu)",
302: __func__, name, addr, (u_long)clen);
303: if (clen > 0)
304: *caddr = '\0';
305: fail:
306: freeaddrinfo(res);
307: return NULL;
308: }
309: return res;
310: }
311:
312: /*
1.385 djm 313: * Check whether the cname is a permitted replacement for the hostname
314: * and perform the replacement if it is.
1.400 djm 315: * NB. this function must operate with a options having undefined members.
1.385 djm 316: */
317: static int
1.443 djm 318: check_follow_cname(int direct, char **namep, const char *cname)
1.385 djm 319: {
320: int i;
321: struct allowed_cname *rule;
322:
323: if (*cname == '\0' || options.num_permitted_cnames == 0 ||
324: strcmp(*namep, cname) == 0)
325: return 0;
1.386 djm 326: if (options.canonicalize_hostname == SSH_CANONICALISE_NO)
1.385 djm 327: return 0;
328: /*
1.386 djm 329: * Don't attempt to canonicalize names that will be interpreted by
1.443 djm 330: * a proxy or jump host unless the user specifically requests so.
1.385 djm 331: */
1.443 djm 332: if (!direct &&
1.386 djm 333: options.canonicalize_hostname != SSH_CANONICALISE_ALWAYS)
1.385 djm 334: return 0;
335: debug3("%s: check \"%s\" CNAME \"%s\"", __func__, *namep, cname);
336: for (i = 0; i < options.num_permitted_cnames; i++) {
337: rule = options.permitted_cnames + i;
1.418 djm 338: if (match_pattern_list(*namep, rule->source_list, 1) != 1 ||
339: match_pattern_list(cname, rule->target_list, 1) != 1)
1.385 djm 340: continue;
1.386 djm 341: verbose("Canonicalized DNS aliased hostname "
1.385 djm 342: "\"%s\" => \"%s\"", *namep, cname);
343: free(*namep);
344: *namep = xstrdup(cname);
345: return 1;
346: }
347: return 0;
348: }
349:
350: /*
351: * Attempt to resolve the supplied hostname after applying the user's
1.387 djm 352: * canonicalization rules. Returns the address list for the host or NULL
353: * if no name was found after canonicalization.
1.400 djm 354: * NB. this function must operate with a options having undefined members.
1.385 djm 355: */
356: static struct addrinfo *
1.400 djm 357: resolve_canonicalize(char **hostp, int port)
1.385 djm 358: {
1.443 djm 359: int i, direct, ndots;
1.413 djm 360: char *cp, *fullhost, newname[NI_MAXHOST];
1.385 djm 361: struct addrinfo *addrs;
362:
1.386 djm 363: if (options.canonicalize_hostname == SSH_CANONICALISE_NO)
1.385 djm 364: return NULL;
1.400 djm 365:
1.385 djm 366: /*
1.386 djm 367: * Don't attempt to canonicalize names that will be interpreted by
1.385 djm 368: * a proxy unless the user specifically requests so.
369: */
1.443 djm 370: direct = option_clear_or_none(options.proxy_command) &&
371: options.jump_host == NULL;
372: if (!direct &&
1.386 djm 373: options.canonicalize_hostname != SSH_CANONICALISE_ALWAYS)
1.385 djm 374: return NULL;
1.400 djm 375:
1.413 djm 376: /* Try numeric hostnames first */
377: if ((addrs = resolve_addr(*hostp, port,
378: newname, sizeof(newname))) != NULL) {
379: debug2("%s: hostname %.100s is address", __func__, *hostp);
380: if (strcasecmp(*hostp, newname) != 0) {
381: debug2("%s: canonicalised address \"%s\" => \"%s\"",
382: __func__, *hostp, newname);
383: free(*hostp);
384: *hostp = xstrdup(newname);
385: }
386: return addrs;
387: }
388:
1.428 djm 389: /* If domain name is anchored, then resolve it now */
390: if ((*hostp)[strlen(*hostp) - 1] == '.') {
391: debug3("%s: name is fully qualified", __func__);
392: fullhost = xstrdup(*hostp);
393: if ((addrs = resolve_host(fullhost, port, 0,
394: newname, sizeof(newname))) != NULL)
395: goto found;
396: free(fullhost);
397: goto notfound;
398: }
399:
1.387 djm 400: /* Don't apply canonicalization to sufficiently-qualified hostnames */
1.385 djm 401: ndots = 0;
402: for (cp = *hostp; *cp != '\0'; cp++) {
403: if (*cp == '.')
404: ndots++;
405: }
1.386 djm 406: if (ndots > options.canonicalize_max_dots) {
407: debug3("%s: not canonicalizing hostname \"%s\" (max dots %d)",
408: __func__, *hostp, options.canonicalize_max_dots);
1.385 djm 409: return NULL;
410: }
411: /* Attempt each supplied suffix */
412: for (i = 0; i < options.num_canonical_domains; i++) {
1.413 djm 413: *newname = '\0';
1.385 djm 414: xasprintf(&fullhost, "%s.%s.", *hostp,
415: options.canonical_domains[i]);
1.400 djm 416: debug3("%s: attempting \"%s\" => \"%s\"", __func__,
417: *hostp, fullhost);
418: if ((addrs = resolve_host(fullhost, port, 0,
1.413 djm 419: newname, sizeof(newname))) == NULL) {
1.385 djm 420: free(fullhost);
421: continue;
422: }
1.428 djm 423: found:
1.385 djm 424: /* Remove trailing '.' */
425: fullhost[strlen(fullhost) - 1] = '\0';
426: /* Follow CNAME if requested */
1.443 djm 427: if (!check_follow_cname(direct, &fullhost, newname)) {
1.386 djm 428: debug("Canonicalized hostname \"%s\" => \"%s\"",
1.385 djm 429: *hostp, fullhost);
430: }
431: free(*hostp);
432: *hostp = fullhost;
433: return addrs;
434: }
1.428 djm 435: notfound:
1.386 djm 436: if (!options.canonicalize_fallback_local)
1.400 djm 437: fatal("%s: Could not resolve host \"%s\"", __progname, *hostp);
438: debug2("%s: host %s not found in any suffix", __func__, *hostp);
1.385 djm 439: return NULL;
440: }
441:
1.32 deraadt 442: /*
1.400 djm 443: * Read per-user configuration file. Ignore the system wide config
444: * file if the user specifies a config file on the command line.
445: */
446: static void
1.466 djm 447: process_config_files(const char *host_name, struct passwd *pw, int post_canon)
1.400 djm 448: {
1.414 deraadt 449: char buf[PATH_MAX];
1.400 djm 450: int r;
451:
452: if (config != NULL) {
453: if (strcasecmp(config, "none") != 0 &&
1.466 djm 454: !read_config_file(config, pw, host, host_name, &options,
1.408 djm 455: SSHCONF_USERCONF | (post_canon ? SSHCONF_POSTCANON : 0)))
1.400 djm 456: fatal("Can't open user config file %.100s: "
457: "%.100s", config, strerror(errno));
458: } else {
459: r = snprintf(buf, sizeof buf, "%s/%s", pw->pw_dir,
460: _PATH_SSH_USER_CONFFILE);
461: if (r > 0 && (size_t)r < sizeof(buf))
1.466 djm 462: (void)read_config_file(buf, pw, host, host_name,
1.408 djm 463: &options, SSHCONF_CHECKPERM | SSHCONF_USERCONF |
464: (post_canon ? SSHCONF_POSTCANON : 0));
1.400 djm 465:
466: /* Read systemwide configuration file after user config. */
1.408 djm 467: (void)read_config_file(_PATH_HOST_CONFIG_FILE, pw,
1.466 djm 468: host, host_name, &options,
1.408 djm 469: post_canon ? SSHCONF_POSTCANON : 0);
470: }
471: }
472:
473: /* Rewrite the port number in an addrinfo list of addresses */
474: static void
475: set_addrinfo_port(struct addrinfo *addrs, int port)
476: {
477: struct addrinfo *addr;
478:
479: for (addr = addrs; addr != NULL; addr = addr->ai_next) {
480: switch (addr->ai_family) {
481: case AF_INET:
482: ((struct sockaddr_in *)addr->ai_addr)->
483: sin_port = htons(port);
484: break;
485: case AF_INET6:
486: ((struct sockaddr_in6 *)addr->ai_addr)->
487: sin6_port = htons(port);
488: break;
489: }
1.400 djm 490: }
491: }
492:
493: /*
1.32 deraadt 494: * Main program for the ssh client.
495: */
1.2 provos 496: int
497: main(int ac, char **av)
1.1 deraadt 498: {
1.437 djm 499: struct ssh *ssh = NULL;
1.462 djm 500: int i, r, opt, exit_status, use_syslog, direct, timeout_ms;
501: int config_test = 0, opt_terminated = 0;
1.466 djm 502: char *p, *cp, *line, *argv0, buf[PATH_MAX], *logfile;
503: char cname[NI_MAXHOST];
1.31 markus 504: struct stat st;
1.98 markus 505: struct passwd *pw;
1.144 stevesk 506: extern int optind, optreset;
507: extern char *optarg;
1.406 millert 508: struct Forward fwd;
1.385 djm 509: struct addrinfo *addrs = NULL;
1.405 djm 510: struct ssh_digest_ctx *md;
511: u_char conn_hash[SSH_DIGEST_MAX_LENGTH];
1.250 djm 512:
1.436 dtucker 513: ssh_malloc_init(); /* must be called before any mallocs */
1.250 djm 514: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
515: sanitise_stdfd();
1.31 markus 516:
1.33 markus 517: /*
1.346 djm 518: * Discard other fds that are hanging around. These can cause problem
519: * with backgrounded ssh processes started by ControlPersist.
520: */
521: closefrom(STDERR_FILENO + 1);
522:
523: /*
1.33 markus 524: * Save the original real uid. It will be needed later (uid-swapping
525: * may clobber the real uid).
526: */
1.31 markus 527: original_real_uid = getuid();
528: original_effective_uid = geteuid();
529:
1.184 stevesk 530: /*
531: * Use uid-swapping to give up root privileges for the duration of
532: * option processing. We will re-instantiate the rights when we are
533: * ready to create the privileged port, and will permanently drop
534: * them when the port has been created (actually, when the connection
535: * has been made, as we may need to create the port several times).
536: */
537: PRIV_END;
538:
1.31 markus 539: /* If we are installed setuid root be careful to not drop core. */
540: if (original_real_uid != original_effective_uid) {
541: struct rlimit rlim;
542: rlim.rlim_cur = rlim.rlim_max = 0;
543: if (setrlimit(RLIMIT_CORE, &rlim) < 0)
544: fatal("setrlimit failed: %.100s", strerror(errno));
1.1 deraadt 545: }
1.107 markus 546: /* Get user data. */
547: pw = getpwuid(original_real_uid);
548: if (!pw) {
1.380 djm 549: logit("No user exists for uid %lu", (u_long)original_real_uid);
1.257 dtucker 550: exit(255);
1.107 markus 551: }
552: /* Take a copy of the returned structure. */
553: pw = pwcopy(pw);
1.31 markus 554:
1.33 markus 555: /*
556: * Set our umask to something reasonable, as some files are created
557: * with the default umask. This will make them world-readable but
558: * writable only by the owner, which is ok for all files for which we
559: * don't set the modes explicitly.
560: */
1.31 markus 561: umask(022);
1.445 djm 562:
563: setlocale(LC_CTYPE, "");
1.31 markus 564:
1.316 djm 565: /*
566: * Initialize option structure to indicate that no values have been
567: * set.
568: */
1.31 markus 569: initialize_options(&options);
570:
1.463 djm 571: /*
572: * Prepare main ssh transport/connection structures
573: */
574: if ((ssh = ssh_alloc_session_state()) == NULL)
575: fatal("Couldn't allocate session state");
576: channel_init_channels(ssh);
577: active_state = ssh; /* XXX legacy API compat */
578:
1.31 markus 579: /* Parse command-line arguments. */
580: host = NULL;
1.320 djm 581: use_syslog = 0;
1.375 dtucker 582: logfile = NULL;
1.325 markus 583: argv0 = av[0];
1.31 markus 584:
1.266 djm 585: again:
1.316 djm 586: while ((opt = getopt(ac, av, "1246ab:c:e:fgi:kl:m:no:p:qstvx"
1.443 djm 587: "ACD:E:F:GI:J:KL:MNO:PQ:R:S:TVw:W:XYy")) != -1) {
1.31 markus 588: switch (opt) {
1.91 jakob 589: case '1':
1.454 djm 590: fatal("SSH protocol v.1 is no longer supported");
1.91 jakob 591: break;
1.47 markus 592: case '2':
1.454 djm 593: /* Ignored */
1.47 markus 594: break;
1.37 markus 595: case '4':
1.196 djm 596: options.address_family = AF_INET;
1.37 markus 597: break;
598: case '6':
1.196 djm 599: options.address_family = AF_INET6;
1.37 markus 600: break;
1.31 markus 601: case 'n':
602: stdin_null_flag = 1;
603: break;
604: case 'f':
605: fork_after_authentication_flag = 1;
606: stdin_null_flag = 1;
607: break;
608: case 'x':
609: options.forward_x11 = 0;
610: break;
611: case 'X':
612: options.forward_x11 = 1;
613: break;
1.320 djm 614: case 'y':
615: use_syslog = 1;
616: break;
1.375 dtucker 617: case 'E':
1.422 dtucker 618: logfile = optarg;
1.375 dtucker 619: break;
1.408 djm 620: case 'G':
621: config_test = 1;
622: break;
1.202 markus 623: case 'Y':
624: options.forward_x11 = 1;
625: options.forward_x11_trusted = 1;
626: break;
1.31 markus 627: case 'g':
1.406 millert 628: options.fwd_opts.gateway_ports = 1;
1.31 markus 629: break;
1.229 djm 630: case 'O':
1.441 dtucker 631: if (options.stdio_forward_host != NULL)
1.332 djm 632: fatal("Cannot specify multiplexing "
633: "command with -W");
634: else if (muxclient_command != 0)
635: fatal("Multiplexing command already specified");
1.229 djm 636: if (strcmp(optarg, "check") == 0)
1.312 djm 637: muxclient_command = SSHMUX_COMMAND_ALIVE_CHECK;
1.338 markus 638: else if (strcmp(optarg, "forward") == 0)
639: muxclient_command = SSHMUX_COMMAND_FORWARD;
1.229 djm 640: else if (strcmp(optarg, "exit") == 0)
1.312 djm 641: muxclient_command = SSHMUX_COMMAND_TERMINATE;
1.357 djm 642: else if (strcmp(optarg, "stop") == 0)
643: muxclient_command = SSHMUX_COMMAND_STOP;
1.365 djm 644: else if (strcmp(optarg, "cancel") == 0)
645: muxclient_command = SSHMUX_COMMAND_CANCEL_FWD;
1.447 markus 646: else if (strcmp(optarg, "proxy") == 0)
647: muxclient_command = SSHMUX_COMMAND_PROXY;
1.229 djm 648: else
649: fatal("Invalid multiplex command.");
650: break;
1.183 stevesk 651: case 'P': /* deprecated */
1.31 markus 652: options.use_privileged_port = 0;
1.376 djm 653: break;
1.394 deraadt 654: case 'Q':
1.376 djm 655: cp = NULL;
1.394 deraadt 656: if (strcmp(optarg, "cipher") == 0)
1.393 djm 657: cp = cipher_alg_list('\n', 0);
1.394 deraadt 658: else if (strcmp(optarg, "cipher-auth") == 0)
1.393 djm 659: cp = cipher_alg_list('\n', 1);
1.394 deraadt 660: else if (strcmp(optarg, "mac") == 0)
1.392 dtucker 661: cp = mac_alg_list('\n');
1.394 deraadt 662: else if (strcmp(optarg, "kex") == 0)
1.392 dtucker 663: cp = kex_alg_list('\n');
1.394 deraadt 664: else if (strcmp(optarg, "key") == 0)
1.451 djm 665: cp = sshkey_alg_list(0, 0, 0, '\n');
1.396 markus 666: else if (strcmp(optarg, "key-cert") == 0)
1.451 djm 667: cp = sshkey_alg_list(1, 0, 0, '\n');
1.396 markus 668: else if (strcmp(optarg, "key-plain") == 0)
1.451 djm 669: cp = sshkey_alg_list(0, 1, 0, '\n');
1.416 djm 670: else if (strcmp(optarg, "protocol-version") == 0) {
671: cp = xstrdup("2");
672: }
1.376 djm 673: if (cp == NULL)
674: fatal("Unsupported query \"%s\"", optarg);
675: printf("%s\n", cp);
676: free(cp);
677: exit(0);
1.31 markus 678: break;
679: case 'a':
680: options.forward_agent = 0;
1.53 markus 681: break;
682: case 'A':
683: options.forward_agent = 1;
1.31 markus 684: break;
685: case 'k':
1.204 dtucker 686: options.gss_deleg_creds = 0;
1.297 djm 687: break;
688: case 'K':
689: options.gss_authentication = 1;
690: options.gss_deleg_creds = 1;
1.31 markus 691: break;
692: case 'i':
1.429 dtucker 693: p = tilde_expand_filename(optarg, original_real_uid);
694: if (stat(p, &st) < 0)
1.128 fgsch 695: fprintf(stderr, "Warning: Identity file %s "
1.429 dtucker 696: "not accessible: %s.\n", p,
1.231 otto 697: strerror(errno));
1.429 dtucker 698: else
699: add_identity_file(&options, NULL, p, 1);
700: free(p);
1.31 markus 701: break;
1.127 markus 702: case 'I':
1.333 markus 703: #ifdef ENABLE_PKCS11
1.422 dtucker 704: free(options.pkcs11_provider);
1.333 markus 705: options.pkcs11_provider = xstrdup(optarg);
1.137 jakob 706: #else
1.333 markus 707: fprintf(stderr, "no support for PKCS#11.\n");
1.137 jakob 708: #endif
1.127 markus 709: break;
1.443 djm 710: case 'J':
711: if (options.jump_host != NULL)
712: fatal("Only a single -J option permitted");
713: if (options.proxy_command != NULL)
714: fatal("Cannot specify -J with ProxyCommand");
715: if (parse_jump(optarg, &options, 1) == -1)
716: fatal("Invalid -J argument");
717: options.proxy_command = xstrdup("none");
718: break;
1.31 markus 719: case 't':
1.359 djm 720: if (options.request_tty == REQUEST_TTY_YES)
721: options.request_tty = REQUEST_TTY_FORCE;
722: else
723: options.request_tty = REQUEST_TTY_YES;
1.31 markus 724: break;
725: case 'v':
1.197 markus 726: if (debug_flag == 0) {
1.66 markus 727: debug_flag = 1;
728: options.log_level = SYSLOG_LEVEL_DEBUG1;
1.197 markus 729: } else {
1.443 djm 730: if (options.log_level < SYSLOG_LEVEL_DEBUG3) {
731: debug_flag++;
1.197 markus 732: options.log_level++;
1.443 djm 733: }
1.197 markus 734: }
1.375 dtucker 735: break;
1.31 markus 736: case 'V':
1.209 markus 737: fprintf(stderr, "%s, %s\n",
1.402 markus 738: SSH_VERSION,
739: #ifdef WITH_OPENSSL
740: SSLeay_version(SSLEAY_VERSION)
741: #else
742: "without OpenSSL"
743: #endif
744: );
1.31 markus 745: if (opt == 'V')
746: exit(0);
747: break;
1.255 reyk 748: case 'w':
1.256 reyk 749: if (options.tun_open == -1)
750: options.tun_open = SSH_TUNMODE_DEFAULT;
1.255 reyk 751: options.tun_local = a2tun(optarg, &options.tun_remote);
1.256 reyk 752: if (options.tun_local == SSH_TUNID_ERR) {
1.316 djm 753: fprintf(stderr,
754: "Bad tun device '%s'\n", optarg);
1.257 dtucker 755: exit(255);
1.255 reyk 756: }
757: break;
1.331 dtucker 758: case 'W':
1.441 dtucker 759: if (options.stdio_forward_host != NULL)
1.332 djm 760: fatal("stdio forward already specified");
761: if (muxclient_command != 0)
762: fatal("Cannot specify stdio forward with -O");
1.331 dtucker 763: if (parse_forward(&fwd, optarg, 1, 0)) {
1.441 dtucker 764: options.stdio_forward_host = fwd.listen_host;
765: options.stdio_forward_port = fwd.listen_port;
1.378 djm 766: free(fwd.connect_host);
1.331 dtucker 767: } else {
768: fprintf(stderr,
769: "Bad stdio forwarding specification '%s'\n",
770: optarg);
771: exit(255);
772: }
1.359 djm 773: options.request_tty = REQUEST_TTY_NO;
1.331 dtucker 774: no_shell_flag = 1;
775: break;
1.31 markus 776: case 'q':
777: options.log_level = SYSLOG_LEVEL_QUIET;
778: break;
779: case 'e':
780: if (optarg[0] == '^' && optarg[2] == 0 &&
1.128 fgsch 781: (u_char) optarg[1] >= 64 &&
782: (u_char) optarg[1] < 128)
1.78 markus 783: options.escape_char = (u_char) optarg[1] & 31;
1.31 markus 784: else if (strlen(optarg) == 1)
1.78 markus 785: options.escape_char = (u_char) optarg[0];
1.31 markus 786: else if (strcmp(optarg, "none") == 0)
1.119 stevesk 787: options.escape_char = SSH_ESCAPECHAR_NONE;
1.31 markus 788: else {
1.128 fgsch 789: fprintf(stderr, "Bad escape character '%s'.\n",
790: optarg);
1.257 dtucker 791: exit(255);
1.31 markus 792: }
793: break;
794: case 'c':
1.456 djm 795: if (!ciphers_valid(*optarg == '+' ?
1.420 djm 796: optarg + 1 : optarg)) {
797: fprintf(stderr, "Unknown cipher type '%s'\n",
798: optarg);
799: exit(255);
1.95 markus 800: }
1.456 djm 801: free(options.ciphers);
802: options.ciphers = xstrdup(optarg);
1.95 markus 803: break;
804: case 'm':
1.422 dtucker 805: if (mac_valid(optarg)) {
806: free(options.macs);
1.95 markus 807: options.macs = xstrdup(optarg);
1.422 dtucker 808: } else {
1.128 fgsch 809: fprintf(stderr, "Unknown mac type '%s'\n",
810: optarg);
1.257 dtucker 811: exit(255);
1.31 markus 812: }
813: break;
1.214 djm 814: case 'M':
1.242 djm 815: if (options.control_master == SSHCTL_MASTER_YES)
816: options.control_master = SSHCTL_MASTER_ASK;
817: else
818: options.control_master = SSHCTL_MASTER_YES;
1.214 djm 819: break;
1.31 markus 820: case 'p':
1.465 millert 821: if (options.port == -1) {
822: options.port = a2port(optarg);
823: if (options.port <= 0) {
824: fprintf(stderr, "Bad port '%s'\n",
825: optarg);
826: exit(255);
827: }
1.109 markus 828: }
1.31 markus 829: break;
830: case 'l':
1.465 millert 831: if (options.user == NULL)
832: options.user = optarg;
1.31 markus 833: break;
1.141 stevesk 834:
835: case 'L':
1.324 djm 836: if (parse_forward(&fwd, optarg, 0, 0))
1.232 djm 837: add_local_forward(&options, &fwd);
838: else {
1.128 fgsch 839: fprintf(stderr,
1.232 djm 840: "Bad local forwarding specification '%s'\n",
1.128 fgsch 841: optarg);
1.257 dtucker 842: exit(255);
1.31 markus 843: }
1.232 djm 844: break;
845:
846: case 'R':
1.464 markus 847: if (parse_forward(&fwd, optarg, 0, 1) ||
848: parse_forward(&fwd, optarg, 1, 1)) {
1.232 djm 849: add_remote_forward(&options, &fwd);
850: } else {
1.128 fgsch 851: fprintf(stderr,
1.232 djm 852: "Bad remote forwarding specification "
853: "'%s'\n", optarg);
1.257 dtucker 854: exit(255);
1.31 markus 855: }
856: break;
1.108 markus 857:
858: case 'D':
1.324 djm 859: if (parse_forward(&fwd, optarg, 1, 0)) {
1.322 stevesk 860: add_local_forward(&options, &fwd);
1.232 djm 861: } else {
1.322 stevesk 862: fprintf(stderr,
863: "Bad dynamic forwarding specification "
864: "'%s'\n", optarg);
1.257 dtucker 865: exit(255);
1.109 markus 866: }
1.108 markus 867: break;
868:
1.31 markus 869: case 'C':
870: options.compression = 1;
871: break;
1.45 markus 872: case 'N':
873: no_shell_flag = 1;
1.359 djm 874: options.request_tty = REQUEST_TTY_NO;
1.45 markus 875: break;
876: case 'T':
1.359 djm 877: options.request_tty = REQUEST_TTY_NO;
1.45 markus 878: break;
1.31 markus 879: case 'o':
1.205 markus 880: line = xstrdup(optarg);
1.408 djm 881: if (process_config_line(&options, pw,
882: host ? host : "", host ? host : "", line,
883: "command-line", 0, NULL, SSHCONF_USERCONF) != 0)
1.257 dtucker 884: exit(255);
1.378 djm 885: free(line);
1.31 markus 886: break;
1.85 djm 887: case 's':
888: subsystem_flag = 1;
1.117 markus 889: break;
1.214 djm 890: case 'S':
1.431 mmcc 891: free(options.control_path);
1.214 djm 892: options.control_path = xstrdup(optarg);
893: break;
1.117 markus 894: case 'b':
895: options.bind_address = optarg;
1.85 djm 896: break;
1.139 markus 897: case 'F':
898: config = optarg;
899: break;
1.31 markus 900: default:
901: usage();
1.1 deraadt 902: }
1.31 markus 903: }
904:
1.462 djm 905: if (optind > 1 && strcmp(av[optind - 1], "--") == 0)
906: opt_terminated = 1;
907:
1.128 fgsch 908: ac -= optind;
909: av += optind;
910:
1.329 guenther 911: if (ac > 0 && !host) {
1.465 millert 912: int tport;
913: char *tuser;
914: switch (parse_ssh_uri(*av, &tuser, &host, &tport)) {
915: case -1:
916: usage();
917: break;
918: case 0:
919: if (options.user == NULL) {
920: options.user = tuser;
921: tuser = NULL;
922: }
923: free(tuser);
924: if (options.port == -1 && tport != -1)
925: options.port = tport;
926: break;
927: default:
1.128 fgsch 928: p = xstrdup(*av);
1.188 markus 929: cp = strrchr(p, '@');
1.465 millert 930: if (cp != NULL) {
931: if (cp == p)
932: usage();
933: if (options.user == NULL) {
934: options.user = p;
935: p = NULL;
936: }
937: *cp++ = '\0';
938: host = xstrdup(cp);
939: free(p);
940: } else
941: host = p;
942: break;
943: }
1.462 djm 944: if (ac > 1 && !opt_terminated) {
1.189 millert 945: optind = optreset = 1;
1.128 fgsch 946: goto again;
947: }
1.189 millert 948: ac--, av++;
1.128 fgsch 949: }
950:
1.31 markus 951: /* Check that we got a host name. */
952: if (!host)
953: usage();
954:
1.385 djm 955: host_arg = xstrdup(host);
956:
1.402 markus 957: #ifdef WITH_OPENSSL
1.350 djm 958: OpenSSL_add_all_algorithms();
1.72 markus 959: ERR_load_crypto_strings();
1.402 markus 960: #endif
1.31 markus 961:
962: /* Initialize the command to execute on remote host. */
963: buffer_init(&command);
1.1 deraadt 964:
1.33 markus 965: /*
966: * Save the command to execute on the remote host in a buffer. There
967: * is no limit on the length of the command, except by the maximum
968: * packet size. Also sets the tty flag if there is no command.
969: */
1.128 fgsch 970: if (!ac) {
1.31 markus 971: /* No command specified - execute shell on a tty. */
1.85 djm 972: if (subsystem_flag) {
1.128 fgsch 973: fprintf(stderr,
974: "You must specify a subsystem to invoke.\n");
1.85 djm 975: usage();
976: }
1.31 markus 977: } else {
1.128 fgsch 978: /* A command has been specified. Store it into the buffer. */
979: for (i = 0; i < ac; i++) {
980: if (i)
1.31 markus 981: buffer_append(&command, " ", 1);
982: buffer_append(&command, av[i], strlen(av[i]));
983: }
984: }
985:
1.101 markus 986: /*
987: * Initialize "log" output. Since we are the client all output
1.375 dtucker 988: * goes to stderr unless otherwise specified by -y or -E.
1.101 markus 989: */
1.375 dtucker 990: if (use_syslog && logfile != NULL)
991: fatal("Can't specify both -y and -E");
1.422 dtucker 992: if (logfile != NULL)
1.375 dtucker 993: log_redirect_stderr_to(logfile);
1.325 markus 994: log_init(argv0,
1.452 dtucker 995: options.log_level == SYSLOG_LEVEL_NOT_SET ?
996: SYSLOG_LEVEL_INFO : options.log_level,
997: options.log_facility == SYSLOG_FACILITY_NOT_SET ?
998: SYSLOG_FACILITY_USER : options.log_facility,
999: !use_syslog);
1.375 dtucker 1000:
1001: if (debug_flag)
1.402 markus 1002: logit("%s, %s", SSH_VERSION,
1003: #ifdef WITH_OPENSSL
1004: SSLeay_version(SSLEAY_VERSION)
1005: #else
1006: "without OpenSSL"
1007: #endif
1008: );
1.31 markus 1009:
1.400 djm 1010: /* Parse the configuration files */
1.408 djm 1011: process_config_files(host_arg, pw, 0);
1.400 djm 1012:
1013: /* Hostname canonicalisation needs a few options filled. */
1014: fill_default_options_for_canonicalization(&options);
1015:
1016: /* If the user has replaced the hostname then take it into use now */
1017: if (options.hostname != NULL) {
1018: /* NB. Please keep in sync with readconf.c:match_cfg_line() */
1019: cp = percent_expand(options.hostname,
1020: "h", host, (char *)NULL);
1021: free(host);
1022: host = cp;
1.408 djm 1023: free(options.hostname);
1024: options.hostname = xstrdup(host);
1.400 djm 1025: }
1026:
1027: /* If canonicalization requested then try to apply it */
1028: lowercase(host);
1029: if (options.canonicalize_hostname != SSH_CANONICALISE_NO)
1030: addrs = resolve_canonicalize(&host, options.port);
1031:
1.139 markus 1032: /*
1.401 djm 1033: * If CanonicalizePermittedCNAMEs have been specified but
1034: * other canonicalization did not happen (by not being requested
1035: * or by failing with fallback) then the hostname may still be changed
1036: * as a result of CNAME following.
1037: *
1038: * Try to resolve the bare hostname name using the system resolver's
1039: * usual search rules and then apply the CNAME follow rules.
1040: *
1041: * Skip the lookup if a ProxyCommand is being used unless the user
1042: * has specifically requested canonicalisation for this case via
1043: * CanonicalizeHostname=always
1.139 markus 1044: */
1.443 djm 1045: direct = option_clear_or_none(options.proxy_command) &&
1046: options.jump_host == NULL;
1047: if (addrs == NULL && options.num_permitted_cnames != 0 && (direct ||
1048: options.canonicalize_hostname == SSH_CANONICALISE_ALWAYS)) {
1.403 djm 1049: if ((addrs = resolve_host(host, options.port,
1050: option_clear_or_none(options.proxy_command),
1051: cname, sizeof(cname))) == NULL) {
1052: /* Don't fatal proxied host names not in the DNS */
1053: if (option_clear_or_none(options.proxy_command))
1054: cleanup_exit(255); /* logged in resolve_host */
1055: } else
1.443 djm 1056: check_follow_cname(direct, &host, cname);
1.400 djm 1057: }
1.139 markus 1058:
1.400 djm 1059: /*
1.408 djm 1060: * If canonicalisation is enabled then re-parse the configuration
1061: * files as new stanzas may match.
1.400 djm 1062: */
1.408 djm 1063: if (options.canonicalize_hostname != 0) {
1064: debug("Re-reading configuration after hostname "
1065: "canonicalisation");
1066: free(options.hostname);
1067: options.hostname = xstrdup(host);
1068: process_config_files(host_arg, pw, 1);
1069: /*
1070: * Address resolution happens early with canonicalisation
1071: * enabled and the port number may have changed since, so
1072: * reset it in address list
1073: */
1074: if (addrs != NULL && options.port > 0)
1075: set_addrinfo_port(addrs, options.port);
1.139 markus 1076: }
1.31 markus 1077:
1078: /* Fill configuration defaults. */
1079: fill_default_options(&options);
1.443 djm 1080:
1081: /*
1082: * If ProxyJump option specified, then construct a ProxyCommand now.
1083: */
1084: if (options.jump_host != NULL) {
1085: char port_s[8];
1086:
1087: /* Consistency check */
1088: if (options.proxy_command != NULL)
1089: fatal("inconsistent options: ProxyCommand+ProxyJump");
1090: /* Never use FD passing for ProxyJump */
1091: options.proxy_use_fdpass = 0;
1092: snprintf(port_s, sizeof(port_s), "%d", options.jump_port);
1093: xasprintf(&options.proxy_command,
1.450 djm 1094: "ssh%s%s%s%s%s%s%s%s%s%.*s -W '[%%h]:%%p' %s",
1.443 djm 1095: /* Optional "-l user" argument if jump_user set */
1096: options.jump_user == NULL ? "" : " -l ",
1097: options.jump_user == NULL ? "" : options.jump_user,
1098: /* Optional "-p port" argument if jump_port set */
1099: options.jump_port <= 0 ? "" : " -p ",
1100: options.jump_port <= 0 ? "" : port_s,
1101: /* Optional additional jump hosts ",..." */
1102: options.jump_extra == NULL ? "" : " -J ",
1103: options.jump_extra == NULL ? "" : options.jump_extra,
1104: /* Optional "-F" argumment if -F specified */
1105: config == NULL ? "" : " -F ",
1106: config == NULL ? "" : config,
1107: /* Optional "-v" arguments if -v set */
1108: debug_flag ? " -" : "",
1109: debug_flag, "vvv",
1110: /* Mandatory hostname */
1111: options.jump_host);
1112: debug("Setting implicit ProxyCommand from ProxyJump: %s",
1113: options.proxy_command);
1114: }
1.31 markus 1115:
1.400 djm 1116: if (options.port == 0)
1117: options.port = default_ssh_port();
1.463 djm 1118: channel_set_af(ssh, options.address_family);
1.196 djm 1119:
1.383 djm 1120: /* Tidy and check options */
1121: if (options.host_key_alias != NULL)
1122: lowercase(options.host_key_alias);
1123: if (options.proxy_command != NULL &&
1124: strcmp(options.proxy_command, "-") == 0 &&
1125: options.proxy_use_fdpass)
1126: fatal("ProxyCommand=- and ProxyUseFDPass are incompatible");
1.415 djm 1127: if (options.control_persist &&
1128: options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK) {
1129: debug("UpdateHostKeys=ask is incompatible with ControlPersist; "
1130: "disabling");
1131: options.update_hostkeys = 0;
1132: }
1.430 djm 1133: if (options.connection_attempts <= 0)
1134: fatal("Invalid number of ConnectionAttempts");
1135:
1.388 djm 1136: if (original_effective_uid != 0)
1137: options.use_privileged_port = 0;
1.383 djm 1138:
1.461 bluhm 1139: if (buffer_len(&command) != 0 && options.remote_command != NULL)
1140: fatal("Cannot execute command-line and remote command.");
1141:
1142: /* Cannot fork to background if no command. */
1143: if (fork_after_authentication_flag && buffer_len(&command) == 0 &&
1144: options.remote_command == NULL && !no_shell_flag)
1145: fatal("Cannot fork into background without a command "
1146: "to execute.");
1147:
1.31 markus 1148: /* reinit */
1.452 dtucker 1149: log_init(argv0, options.log_level, options.log_facility, !use_syslog);
1.370 djm 1150:
1151: if (options.request_tty == REQUEST_TTY_YES ||
1152: options.request_tty == REQUEST_TTY_FORCE)
1153: tty_flag = 1;
1154:
1155: /* Allocate a tty by default if no command specified. */
1.461 bluhm 1156: if (buffer_len(&command) == 0 && options.remote_command == NULL)
1.370 djm 1157: tty_flag = options.request_tty != REQUEST_TTY_NO;
1158:
1159: /* Force no tty */
1.447 markus 1160: if (options.request_tty == REQUEST_TTY_NO ||
1161: (muxclient_command && muxclient_command != SSHMUX_COMMAND_PROXY))
1.370 djm 1162: tty_flag = 0;
1163: /* Do not allocate a tty if stdin is not a tty. */
1164: if ((!isatty(fileno(stdin)) || stdin_null_flag) &&
1165: options.request_tty != REQUEST_TTY_FORCE) {
1166: if (tty_flag)
1167: logit("Pseudo-terminal will not be allocated because "
1168: "stdin is not a terminal.");
1169: tty_flag = 0;
1170: }
1.31 markus 1171:
1172: if (options.user == NULL)
1173: options.user = xstrdup(pw->pw_name);
1.343 djm 1174:
1.466 djm 1175: /* Set up strings used to percent_expand() arguments */
1.358 djm 1176: if (gethostname(thishost, sizeof(thishost)) == -1)
1177: fatal("gethostname: %s", strerror(errno));
1178: strlcpy(shorthost, thishost, sizeof(shorthost));
1179: shorthost[strcspn(thishost, ".")] = '\0';
1180: snprintf(portstr, sizeof(portstr), "%d", options.port);
1.423 djm 1181: snprintf(uidstr, sizeof(uidstr), "%d", pw->pw_uid);
1.358 djm 1182:
1.405 djm 1183: if ((md = ssh_digest_start(SSH_DIGEST_SHA1)) == NULL ||
1184: ssh_digest_update(md, thishost, strlen(thishost)) < 0 ||
1185: ssh_digest_update(md, host, strlen(host)) < 0 ||
1186: ssh_digest_update(md, portstr, strlen(portstr)) < 0 ||
1187: ssh_digest_update(md, options.user, strlen(options.user)) < 0 ||
1188: ssh_digest_final(md, conn_hash, sizeof(conn_hash)) < 0)
1189: fatal("%s: mux digest failed", __func__);
1190: ssh_digest_free(md);
1191: conn_hash_hex = tohex(conn_hash, ssh_digest_bytes(SSH_DIGEST_SHA1));
1192:
1.466 djm 1193: /*
1194: * Expand tokens in arguments. NB. LocalCommand is expanded later,
1195: * after port-forwarding is set up, so it may pick up any local
1196: * tunnel interface name allocated.
1197: */
1.461 bluhm 1198: if (options.remote_command != NULL) {
1199: debug3("expanding RemoteCommand: %s", options.remote_command);
1200: cp = options.remote_command;
1201: options.remote_command = percent_expand(cp,
1202: "C", conn_hash_hex,
1203: "L", shorthost,
1204: "d", pw->pw_dir,
1205: "h", host,
1206: "l", thishost,
1207: "n", host_arg,
1208: "p", portstr,
1209: "r", options.user,
1210: "u", pw->pw_name,
1211: (char *)NULL);
1212: debug3("expanded RemoteCommand: %s", options.remote_command);
1213: free(cp);
1214: buffer_append(&command, options.remote_command,
1215: strlen(options.remote_command));
1.304 dtucker 1216: }
1.31 markus 1217:
1.214 djm 1218: if (options.control_path != NULL) {
1.241 djm 1219: cp = tilde_expand_filename(options.control_path,
1220: original_real_uid);
1.378 djm 1221: free(options.control_path);
1.405 djm 1222: options.control_path = percent_expand(cp,
1223: "C", conn_hash_hex,
1224: "L", shorthost,
1225: "h", host,
1226: "l", thishost,
1227: "n", host_arg,
1228: "p", portstr,
1229: "r", options.user,
1230: "u", pw->pw_name,
1.423 djm 1231: "i", uidstr,
1.358 djm 1232: (char *)NULL);
1.378 djm 1233: free(cp);
1.214 djm 1234: }
1.405 djm 1235: free(conn_hash_hex);
1.408 djm 1236:
1237: if (config_test) {
1238: dump_client_config(&options, host);
1239: exit(0);
1240: }
1.405 djm 1241:
1.312 djm 1242: if (muxclient_command != 0 && options.control_path == NULL)
1.240 djm 1243: fatal("No ControlPath specified for \"-O\" command");
1.447 markus 1244: if (options.control_path != NULL) {
1245: int sock;
1246: if ((sock = muxclient(options.control_path)) >= 0) {
1.463 djm 1247: ssh_packet_set_connection(ssh, sock, sock);
1.447 markus 1248: packet_set_mux();
1249: goto skip_connect;
1250: }
1251: }
1.401 djm 1252:
1253: /*
1254: * If hostname canonicalisation was not enabled, then we may not
1255: * have yet resolved the hostname. Do so now.
1256: */
1257: if (addrs == NULL && options.proxy_command == NULL) {
1.421 djm 1258: debug2("resolving \"%s\" port %d", host, options.port);
1.401 djm 1259: if ((addrs = resolve_host(host, options.port, 1,
1260: cname, sizeof(cname))) == NULL)
1261: cleanup_exit(255); /* resolve_host logs the error */
1262: }
1.214 djm 1263:
1.303 djm 1264: timeout_ms = options.connection_timeout * 1000;
1265:
1.77 markus 1266: /* Open a connection to the remote host. */
1.463 djm 1267: if (ssh_connect(ssh, host, addrs, &hostaddr, options.port,
1.385 djm 1268: options.address_family, options.connection_attempts,
1269: &timeout_ms, options.tcp_keep_alive,
1.388 djm 1270: options.use_privileged_port) != 0)
1.257 dtucker 1271: exit(255);
1.31 markus 1272:
1.391 djm 1273: if (addrs != NULL)
1274: freeaddrinfo(addrs);
1275:
1.385 djm 1276: packet_set_timeout(options.server_alive_interval,
1277: options.server_alive_count_max);
1278:
1.437 djm 1279: ssh = active_state; /* XXX */
1280:
1.303 djm 1281: if (timeout_ms > 0)
1282: debug3("timeout: %d ms remain after connect", timeout_ms);
1283:
1.33 markus 1284: /*
1285: * If we successfully made the connection, load the host private key
1286: * in case we will need it later for combined rsa-rhosts
1287: * authentication. This must be done before releasing extra
1288: * privileges, because the file is only readable by root.
1.174 markus 1289: * If we cannot access the private keys, load the public keys
1290: * instead and try to execute the ssh-keysign helper instead.
1.33 markus 1291: */
1.112 markus 1292: sensitive_data.nkeys = 0;
1293: sensitive_data.keys = NULL;
1.173 markus 1294: sensitive_data.external_keysign = 0;
1.457 djm 1295: if (options.hostbased_authentication) {
1.397 djm 1296: sensitive_data.nkeys = 9;
1.274 deraadt 1297: sensitive_data.keys = xcalloc(sensitive_data.nkeys,
1.460 markus 1298: sizeof(struct sshkey)); /* XXX */
1.177 markus 1299:
1300: PRIV_START;
1.411 djm 1301: sensitive_data.keys[1] = key_load_private_cert(KEY_ECDSA,
1.349 djm 1302: _PATH_HOST_ECDSA_KEY_FILE, "", NULL);
1.411 djm 1303: sensitive_data.keys[2] = key_load_private_cert(KEY_ED25519,
1304: _PATH_HOST_ED25519_KEY_FILE, "", NULL);
1.349 djm 1305: sensitive_data.keys[3] = key_load_private_cert(KEY_RSA,
1.345 djm 1306: _PATH_HOST_RSA_KEY_FILE, "", NULL);
1.411 djm 1307: sensitive_data.keys[4] = key_load_private_cert(KEY_DSA,
1308: _PATH_HOST_DSA_KEY_FILE, "", NULL);
1309: sensitive_data.keys[5] = key_load_private_type(KEY_ECDSA,
1.349 djm 1310: _PATH_HOST_ECDSA_KEY_FILE, "", NULL, NULL);
1.411 djm 1311: sensitive_data.keys[6] = key_load_private_type(KEY_ED25519,
1312: _PATH_HOST_ED25519_KEY_FILE, "", NULL, NULL);
1.397 djm 1313: sensitive_data.keys[7] = key_load_private_type(KEY_RSA,
1.276 dtucker 1314: _PATH_HOST_RSA_KEY_FILE, "", NULL, NULL);
1.411 djm 1315: sensitive_data.keys[8] = key_load_private_type(KEY_DSA,
1316: _PATH_HOST_DSA_KEY_FILE, "", NULL, NULL);
1.177 markus 1317: PRIV_END;
1.173 markus 1318:
1.181 markus 1319: if (options.hostbased_authentication == 1 &&
1320: sensitive_data.keys[0] == NULL &&
1.349 djm 1321: sensitive_data.keys[5] == NULL &&
1.396 markus 1322: sensitive_data.keys[6] == NULL &&
1.397 djm 1323: sensitive_data.keys[7] == NULL &&
1324: sensitive_data.keys[8] == NULL) {
1.345 djm 1325: sensitive_data.keys[1] = key_load_cert(
1.411 djm 1326: _PATH_HOST_ECDSA_KEY_FILE);
1.345 djm 1327: sensitive_data.keys[2] = key_load_cert(
1.411 djm 1328: _PATH_HOST_ED25519_KEY_FILE);
1.349 djm 1329: sensitive_data.keys[3] = key_load_cert(
1.345 djm 1330: _PATH_HOST_RSA_KEY_FILE);
1.397 djm 1331: sensitive_data.keys[4] = key_load_cert(
1.411 djm 1332: _PATH_HOST_DSA_KEY_FILE);
1.397 djm 1333: sensitive_data.keys[5] = key_load_public(
1.411 djm 1334: _PATH_HOST_ECDSA_KEY_FILE, NULL);
1.397 djm 1335: sensitive_data.keys[6] = key_load_public(
1.411 djm 1336: _PATH_HOST_ED25519_KEY_FILE, NULL);
1.397 djm 1337: sensitive_data.keys[7] = key_load_public(
1.173 markus 1338: _PATH_HOST_RSA_KEY_FILE, NULL);
1.397 djm 1339: sensitive_data.keys[8] = key_load_public(
1.411 djm 1340: _PATH_HOST_DSA_KEY_FILE, NULL);
1.173 markus 1341: sensitive_data.external_keysign = 1;
1342: }
1.31 markus 1343: }
1.33 markus 1344: /*
1345: * Get rid of any extra privileges that we may have. We will no
1346: * longer need them. Also, extra privileges could make it very hard
1347: * to read identity files and other non-world-readable files from the
1348: * user's home directory if it happens to be on a NFS volume where
1349: * root is mapped to nobody.
1350: */
1.225 dtucker 1351: if (original_effective_uid == 0) {
1352: PRIV_START;
1353: permanently_set_uid(pw);
1354: }
1.31 markus 1355:
1.33 markus 1356: /*
1357: * Now that we are back to our own permissions, create ~/.ssh
1.254 djm 1358: * directory if it doesn't already exist.
1.33 markus 1359: */
1.367 djm 1360: if (config == NULL) {
1361: r = snprintf(buf, sizeof buf, "%s%s%s", pw->pw_dir,
1362: strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR);
1363: if (r > 0 && (size_t)r < sizeof(buf) && stat(buf, &st) < 0)
1364: if (mkdir(buf, 0700) < 0)
1365: error("Could not create directory '%.200s'.",
1366: buf);
1367: }
1.31 markus 1368:
1.104 markus 1369: /* load options.identity_files */
1.466 djm 1370: load_public_identity_files(pw);
1.439 markus 1371:
1372: /* optionally set the SSH_AUTHSOCKET_ENV_NAME varibale */
1.440 markus 1373: if (options.identity_agent &&
1374: strcmp(options.identity_agent, SSH_AUTHSOCKET_ENV_NAME) != 0) {
1.439 markus 1375: if (strcmp(options.identity_agent, "none") == 0) {
1376: unsetenv(SSH_AUTHSOCKET_ENV_NAME);
1377: } else {
1378: p = tilde_expand_filename(options.identity_agent,
1379: original_real_uid);
1380: cp = percent_expand(p, "d", pw->pw_dir,
1381: "u", pw->pw_name, "l", thishost, "h", host,
1382: "r", options.user, (char *)NULL);
1383: setenv(SSH_AUTHSOCKET_ENV_NAME, cp, 1);
1384: free(cp);
1385: free(p);
1386: }
1387: }
1.104 markus 1388:
1389: /* Expand ~ in known host file names. */
1.361 djm 1390: tilde_expand_paths(options.system_hostfiles,
1391: options.num_system_hostfiles);
1392: tilde_expand_paths(options.user_hostfiles, options.num_user_hostfiles);
1.149 markus 1393:
1394: signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
1.352 djm 1395: signal(SIGCHLD, main_sigchld_handler);
1.31 markus 1396:
1.316 djm 1397: /* Log into the remote system. Never returns if the login fails. */
1.303 djm 1398: ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr,
1.355 djm 1399: options.port, pw, timeout_ms);
1.339 djm 1400:
1401: if (packet_connection_is_on_socket()) {
1402: verbose("Authenticated to %s ([%s]:%d).", host,
1.437 djm 1403: ssh_remote_ipaddr(ssh), ssh_remote_port(ssh));
1.339 djm 1404: } else {
1405: verbose("Authenticated to %s (via proxy).", host);
1406: }
1.31 markus 1407:
1.112 markus 1408: /* We no longer need the private host keys. Clear them now. */
1409: if (sensitive_data.nkeys != 0) {
1410: for (i = 0; i < sensitive_data.nkeys; i++) {
1411: if (sensitive_data.keys[i] != NULL) {
1412: /* Destroys contents safely */
1413: debug3("clear hostkey %d", i);
1414: key_free(sensitive_data.keys[i]);
1415: sensitive_data.keys[i] = NULL;
1416: }
1417: }
1.378 djm 1418: free(sensitive_data.keys);
1.134 markus 1419: }
1420: for (i = 0; i < options.num_identity_files; i++) {
1.378 djm 1421: free(options.identity_files[i]);
1422: options.identity_files[i] = NULL;
1.134 markus 1423: if (options.identity_keys[i]) {
1424: key_free(options.identity_keys[i]);
1425: options.identity_keys[i] = NULL;
1426: }
1.112 markus 1427: }
1.426 djm 1428: for (i = 0; i < options.num_certificate_files; i++) {
1429: free(options.certificate_files[i]);
1430: options.certificate_files[i] = NULL;
1431: }
1.31 markus 1432:
1.447 markus 1433: skip_connect:
1.466 djm 1434: exit_status = ssh_session2(ssh, pw);
1.45 markus 1435: packet_close();
1.186 djm 1436:
1.312 djm 1437: if (options.control_path != NULL && muxserver_sock != -1)
1.214 djm 1438: unlink(options.control_path);
1439:
1.353 djm 1440: /* Kill ProxyCommand if it is running. */
1441: ssh_kill_proxy_command();
1.186 djm 1442:
1.45 markus 1443: return exit_status;
1444: }
1445:
1.344 djm 1446: static void
1447: control_persist_detach(void)
1448: {
1449: pid_t pid;
1.438 djm 1450: int devnull, keep_stderr;
1.344 djm 1451:
1452: debug("%s: backgrounding master process", __func__);
1453:
1454: /*
1455: * master (current process) into the background, and make the
1456: * foreground process a client of the backgrounded master.
1457: */
1458: switch ((pid = fork())) {
1459: case -1:
1460: fatal("%s: fork: %s", __func__, strerror(errno));
1461: case 0:
1462: /* Child: master process continues mainloop */
1463: break;
1464: default:
1465: /* Parent: set up mux slave to connect to backgrounded master */
1466: debug2("%s: background process is %ld", __func__, (long)pid);
1467: stdin_null_flag = ostdin_null_flag;
1.359 djm 1468: options.request_tty = orequest_tty;
1.344 djm 1469: tty_flag = otty_flag;
1470: close(muxserver_sock);
1471: muxserver_sock = -1;
1.351 markus 1472: options.control_master = SSHCTL_MASTER_NO;
1.344 djm 1473: muxclient(options.control_path);
1474: /* muxclient() doesn't return on success. */
1475: fatal("Failed to connect to new control master");
1476: }
1.346 djm 1477: if ((devnull = open(_PATH_DEVNULL, O_RDWR)) == -1) {
1478: error("%s: open(\"/dev/null\"): %s", __func__,
1479: strerror(errno));
1480: } else {
1.438 djm 1481: keep_stderr = log_is_on_stderr() && debug_flag;
1.346 djm 1482: if (dup2(devnull, STDIN_FILENO) == -1 ||
1.438 djm 1483: dup2(devnull, STDOUT_FILENO) == -1 ||
1484: (!keep_stderr && dup2(devnull, STDERR_FILENO) == -1))
1.346 djm 1485: error("%s: dup2: %s", __func__, strerror(errno));
1486: if (devnull > STDERR_FILENO)
1487: close(devnull);
1488: }
1.381 djm 1489: daemon(1, 1);
1.362 djm 1490: setproctitle("%s [mux]", options.control_path);
1.344 djm 1491: }
1492:
1493: /* Do fork() after authentication. Used by "ssh -f" */
1494: static void
1495: fork_postauth(void)
1496: {
1497: if (need_controlpersist_detach)
1498: control_persist_detach();
1499: debug("forking to background");
1500: fork_after_authentication_flag = 0;
1501: if (daemon(1, 1) < 0)
1502: fatal("daemon() failed: %.200s", strerror(errno));
1503: }
1504:
1.315 djm 1505: /* Callback for remote forward global requests */
1506: static void
1.463 djm 1507: ssh_confirm_remote_forward(struct ssh *ssh, int type, u_int32_t seq, void *ctxt)
1.315 djm 1508: {
1.406 millert 1509: struct Forward *rfwd = (struct Forward *)ctxt;
1.315 djm 1510:
1.324 djm 1511: /* XXX verbose() on failure? */
1.404 markus 1512: debug("remote forward %s for: listen %s%s%d, connect %s:%d",
1.315 djm 1513: type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
1.406 millert 1514: rfwd->listen_path ? rfwd->listen_path :
1515: rfwd->listen_host ? rfwd->listen_host : "",
1516: (rfwd->listen_path || rfwd->listen_host) ? ":" : "",
1517: rfwd->listen_port, rfwd->connect_path ? rfwd->connect_path :
1518: rfwd->connect_host, rfwd->connect_port);
1519: if (rfwd->listen_path == NULL && rfwd->listen_port == 0) {
1.366 markus 1520: if (type == SSH2_MSG_REQUEST_SUCCESS) {
1521: rfwd->allocated_port = packet_get_int();
1522: logit("Allocated port %u for remote forward to %s:%d",
1523: rfwd->allocated_port,
1524: rfwd->connect_host, rfwd->connect_port);
1.463 djm 1525: channel_update_permitted_opens(ssh,
1526: rfwd->handle, rfwd->allocated_port);
1.366 markus 1527: } else {
1.463 djm 1528: channel_update_permitted_opens(ssh, rfwd->handle, -1);
1.366 markus 1529: }
1.324 djm 1530: }
1531:
1.315 djm 1532: if (type == SSH2_MSG_REQUEST_FAILURE) {
1.406 millert 1533: if (options.exit_on_forward_failure) {
1534: if (rfwd->listen_path != NULL)
1535: fatal("Error: remote port forwarding failed "
1536: "for listen path %s", rfwd->listen_path);
1537: else
1538: fatal("Error: remote port forwarding failed "
1539: "for listen port %d", rfwd->listen_port);
1540: } else {
1541: if (rfwd->listen_path != NULL)
1542: logit("Warning: remote port forwarding failed "
1543: "for listen path %s", rfwd->listen_path);
1544: else
1545: logit("Warning: remote port forwarding failed "
1546: "for listen port %d", rfwd->listen_port);
1547: }
1.315 djm 1548: }
1.318 djm 1549: if (++remote_forward_confirms_received == options.num_remote_forwards) {
1.315 djm 1550: debug("All remote forwarding requests processed");
1.344 djm 1551: if (fork_after_authentication_flag)
1552: fork_postauth();
1.318 djm 1553: }
1.315 djm 1554: }
1555:
1.126 itojun 1556: static void
1.463 djm 1557: client_cleanup_stdio_fwd(struct ssh *ssh, int id, void *arg)
1.331 dtucker 1558: {
1559: debug("stdio forwarding: done");
1560: cleanup_exit(0);
1561: }
1562:
1.368 djm 1563: static void
1.463 djm 1564: ssh_stdio_confirm(struct ssh *ssh, int id, int success, void *arg)
1.407 djm 1565: {
1566: if (!success)
1567: fatal("stdio forwarding failed");
1568: }
1569:
1570: static void
1.463 djm 1571: ssh_init_stdio_forwarding(struct ssh *ssh)
1.331 dtucker 1572: {
1573: Channel *c;
1.332 djm 1574: int in, out;
1.331 dtucker 1575:
1.441 dtucker 1576: if (options.stdio_forward_host == NULL)
1.368 djm 1577: return;
1578:
1.441 dtucker 1579: debug3("%s: %s:%d", __func__, options.stdio_forward_host,
1580: options.stdio_forward_port);
1.332 djm 1581:
1.368 djm 1582: if ((in = dup(STDIN_FILENO)) < 0 ||
1583: (out = dup(STDOUT_FILENO)) < 0)
1.332 djm 1584: fatal("channel_connect_stdio_fwd: dup() in/out failed");
1.463 djm 1585: if ((c = channel_connect_stdio_fwd(ssh, options.stdio_forward_host,
1.441 dtucker 1586: options.stdio_forward_port, in, out)) == NULL)
1.368 djm 1587: fatal("%s: channel_connect_stdio_fwd failed", __func__);
1.463 djm 1588: channel_register_cleanup(ssh, c->self, client_cleanup_stdio_fwd, 0);
1589: channel_register_open_confirm(ssh, c->self, ssh_stdio_confirm, NULL);
1.331 dtucker 1590: }
1591:
1592: static void
1.466 djm 1593: ssh_init_forwarding(struct ssh *ssh, char **ifname)
1.70 markus 1594: {
1.86 markus 1595: int success = 0;
1.70 markus 1596: int i;
1.331 dtucker 1597:
1.70 markus 1598: /* Initiate local TCP/IP port forwardings. */
1599: for (i = 0; i < options.num_local_forwards; i++) {
1.232 djm 1600: debug("Local connections to %.200s:%d forwarded to remote "
1601: "address %.200s:%d",
1.406 millert 1602: (options.local_forwards[i].listen_path != NULL) ?
1603: options.local_forwards[i].listen_path :
1.234 deraadt 1604: (options.local_forwards[i].listen_host == NULL) ?
1.406 millert 1605: (options.fwd_opts.gateway_ports ? "*" : "LOCALHOST") :
1.232 djm 1606: options.local_forwards[i].listen_host,
1607: options.local_forwards[i].listen_port,
1.406 millert 1608: (options.local_forwards[i].connect_path != NULL) ?
1609: options.local_forwards[i].connect_path :
1.232 djm 1610: options.local_forwards[i].connect_host,
1611: options.local_forwards[i].connect_port);
1.463 djm 1612: success += channel_setup_local_fwd_listener(ssh,
1.406 millert 1613: &options.local_forwards[i], &options.fwd_opts);
1.70 markus 1614: }
1.283 markus 1615: if (i > 0 && success != i && options.exit_on_forward_failure)
1616: fatal("Could not request local forwarding.");
1.86 markus 1617: if (i > 0 && success == 0)
1618: error("Could not request local forwarding.");
1.70 markus 1619:
1620: /* Initiate remote TCP/IP port forwardings. */
1621: for (i = 0; i < options.num_remote_forwards; i++) {
1.232 djm 1622: debug("Remote connections from %.200s:%d forwarded to "
1623: "local address %.200s:%d",
1.406 millert 1624: (options.remote_forwards[i].listen_path != NULL) ?
1625: options.remote_forwards[i].listen_path :
1.248 djm 1626: (options.remote_forwards[i].listen_host == NULL) ?
1.253 djm 1627: "LOCALHOST" : options.remote_forwards[i].listen_host,
1.232 djm 1628: options.remote_forwards[i].listen_port,
1.406 millert 1629: (options.remote_forwards[i].connect_path != NULL) ?
1630: options.remote_forwards[i].connect_path :
1.232 djm 1631: options.remote_forwards[i].connect_host,
1632: options.remote_forwards[i].connect_port);
1.366 markus 1633: options.remote_forwards[i].handle =
1.463 djm 1634: channel_request_remote_forwarding(ssh,
1.406 millert 1635: &options.remote_forwards[i]);
1.366 markus 1636: if (options.remote_forwards[i].handle < 0) {
1.283 markus 1637: if (options.exit_on_forward_failure)
1638: fatal("Could not request remote forwarding.");
1639: else
1640: logit("Warning: Could not request remote "
1641: "forwarding.");
1.366 markus 1642: } else {
1.463 djm 1643: client_register_global_confirm(
1644: ssh_confirm_remote_forward,
1.366 markus 1645: &options.remote_forwards[i]);
1.283 markus 1646: }
1.70 markus 1647: }
1.301 djm 1648:
1649: /* Initiate tunnel forwarding. */
1650: if (options.tun_open != SSH_TUNMODE_NO) {
1.466 djm 1651: if ((*ifname = client_request_tun_fwd(ssh,
1652: options.tun_open, options.tun_local,
1653: options.tun_remote)) == NULL) {
1.301 djm 1654: if (options.exit_on_forward_failure)
1655: fatal("Could not request tunnel forwarding.");
1656: else
1657: error("Could not request tunnel forwarding.");
1658: }
1659: }
1.70 markus 1660: }
1661:
1.126 itojun 1662: static void
1.70 markus 1663: check_agent_present(void)
1664: {
1.412 djm 1665: int r;
1666:
1.70 markus 1667: if (options.forward_agent) {
1.254 djm 1668: /* Clear agent forwarding if we don't have an agent. */
1.412 djm 1669: if ((r = ssh_get_authentication_socket(NULL)) != 0) {
1.70 markus 1670: options.forward_agent = 0;
1.412 djm 1671: if (r != SSH_ERR_AGENT_NOT_PRESENT)
1672: debug("ssh_get_authentication_socket: %s",
1673: ssh_err(r));
1674: }
1.70 markus 1675: }
1676: }
1677:
1.214 djm 1678: static void
1.463 djm 1679: ssh_session2_setup(struct ssh *ssh, int id, int success, void *arg)
1.214 djm 1680: {
1.215 djm 1681: extern char **environ;
1.243 djm 1682: const char *display;
1683: int interactive = tty_flag;
1.433 djm 1684: char *proto = NULL, *data = NULL;
1.337 djm 1685:
1686: if (!success)
1687: return; /* No need for error message, channels code sens one */
1.215 djm 1688:
1.248 djm 1689: display = getenv("DISPLAY");
1.417 djm 1690: if (display == NULL && options.forward_x11)
1691: debug("X11 forwarding requested but DISPLAY not set");
1.463 djm 1692: if (options.forward_x11 && client_x11_get_proto(ssh, display,
1.433 djm 1693: options.xauth_location, options.forward_x11_trusted,
1694: options.forward_x11_timeout, &proto, &data) == 0) {
1.50 markus 1695: /* Request forwarding with authentication spoofing. */
1.316 djm 1696: debug("Requesting X11 forwarding with authentication "
1697: "spoofing.");
1.463 djm 1698: x11_request_forwarding_with_spoofing(ssh, id, display, proto,
1.363 djm 1699: data, 1);
1.463 djm 1700: client_expect_confirm(ssh, id, "X11 forwarding", CONFIRM_WARN);
1.363 djm 1701: /* XXX exit_on_forward_failure */
1.80 markus 1702: interactive = 1;
1.50 markus 1703: }
1704:
1.70 markus 1705: check_agent_present();
1706: if (options.forward_agent) {
1707: debug("Requesting authentication agent forwarding.");
1.463 djm 1708: channel_request_start(ssh, id, "auth-agent-req@openssh.com", 0);
1.70 markus 1709: packet_send();
1.212 djm 1710: }
1.369 dtucker 1711:
1712: /* Tell the packet module whether this is an interactive session. */
1713: packet_set_interactive(interactive,
1714: options.ip_qos_interactive, options.ip_qos_bulk);
1.212 djm 1715:
1.463 djm 1716: client_session2_setup(ssh, id, tty_flag, subsystem_flag, getenv("TERM"),
1.311 djm 1717: NULL, fileno(stdin), &command, environ);
1.45 markus 1718: }
1719:
1.143 markus 1720: /* open new channel for a session */
1.126 itojun 1721: static int
1.463 djm 1722: ssh_session2_open(struct ssh *ssh)
1.45 markus 1723: {
1.118 markus 1724: Channel *c;
1725: int window, packetmax, in, out, err;
1.60 markus 1726:
1.62 markus 1727: if (stdin_null_flag) {
1.93 itojun 1728: in = open(_PATH_DEVNULL, O_RDONLY);
1.62 markus 1729: } else {
1730: in = dup(STDIN_FILENO);
1731: }
1.60 markus 1732: out = dup(STDOUT_FILENO);
1733: err = dup(STDERR_FILENO);
1.45 markus 1734:
1735: if (in < 0 || out < 0 || err < 0)
1.62 markus 1736: fatal("dup() in/out/err failed");
1.45 markus 1737:
1.69 markus 1738: /* enable nonblocking unless tty */
1739: if (!isatty(in))
1740: set_nonblock(in);
1741: if (!isatty(out))
1742: set_nonblock(out);
1743: if (!isatty(err))
1744: set_nonblock(err);
1745:
1.65 markus 1746: window = CHAN_SES_WINDOW_DEFAULT;
1747: packetmax = CHAN_SES_PACKET_DEFAULT;
1.164 markus 1748: if (tty_flag) {
1749: window >>= 1;
1750: packetmax >>= 1;
1.45 markus 1751: }
1.463 djm 1752: c = channel_new(ssh,
1.45 markus 1753: "session", SSH_CHANNEL_OPENING, in, out, err,
1.65 markus 1754: window, packetmax, CHAN_EXTENDED_WRITE,
1.192 markus 1755: "client-session", /*nonblock*/0);
1.45 markus 1756:
1.463 djm 1757: debug3("%s: channel_new: %d", __func__, c->self);
1.106 markus 1758:
1.463 djm 1759: channel_send_open(ssh, c->self);
1.143 markus 1760: if (!no_shell_flag)
1.463 djm 1761: channel_register_open_confirm(ssh, c->self,
1.310 djm 1762: ssh_session2_setup, NULL);
1.106 markus 1763:
1.118 markus 1764: return c->self;
1.106 markus 1765: }
1766:
1.126 itojun 1767: static int
1.466 djm 1768: ssh_session2(struct ssh *ssh, struct passwd *pw)
1.106 markus 1769: {
1.467 ! djm 1770: int devnull, id = -1;
1.466 djm 1771: char *cp, *tun_fwd_ifname = NULL;
1.106 markus 1772:
1773: /* XXX should be pre-session */
1.368 djm 1774: if (!options.control_persist)
1.463 djm 1775: ssh_init_stdio_forwarding(ssh);
1.466 djm 1776:
1777: ssh_init_forwarding(ssh, &tun_fwd_ifname);
1778:
1779: if (options.local_command != NULL) {
1780: debug3("expanding LocalCommand: %s", options.local_command);
1781: cp = options.local_command;
1782: options.local_command = percent_expand(cp,
1783: "C", conn_hash_hex,
1784: "L", shorthost,
1785: "d", pw->pw_dir,
1786: "h", host,
1787: "l", thishost,
1788: "n", host_arg,
1789: "p", portstr,
1790: "r", options.user,
1791: "u", pw->pw_name,
1792: "T", tun_fwd_ifname == NULL ? "NONE" : tun_fwd_ifname,
1793: (char *)NULL);
1794: debug3("expanded LocalCommand: %s", options.local_command);
1795: free(cp);
1796: }
1.106 markus 1797:
1.344 djm 1798: /* Start listening for multiplex clients */
1.447 markus 1799: if (!packet_get_mux())
1.463 djm 1800: muxserver_listen(ssh);
1.344 djm 1801:
1802: /*
1.368 djm 1803: * If we are in control persist mode and have a working mux listen
1804: * socket, then prepare to background ourselves and have a foreground
1805: * client attach as a control slave.
1806: * NB. we must save copies of the flags that we override for
1.344 djm 1807: * the backgrounding, since we defer attachment of the slave until
1808: * after the connection is fully established (in particular,
1809: * async rfwd replies have been received for ExitOnForwardFailure).
1810: */
1811: if (options.control_persist && muxserver_sock != -1) {
1812: ostdin_null_flag = stdin_null_flag;
1813: ono_shell_flag = no_shell_flag;
1.359 djm 1814: orequest_tty = options.request_tty;
1.344 djm 1815: otty_flag = tty_flag;
1816: stdin_null_flag = 1;
1817: no_shell_flag = 1;
1818: tty_flag = 0;
1819: if (!fork_after_authentication_flag)
1820: need_controlpersist_detach = 1;
1821: fork_after_authentication_flag = 1;
1822: }
1.368 djm 1823: /*
1824: * ControlPersist mux listen socket setup failed, attempt the
1825: * stdio forward setup that we skipped earlier.
1826: */
1827: if (options.control_persist && muxserver_sock == -1)
1.463 djm 1828: ssh_init_stdio_forwarding(ssh);
1.344 djm 1829:
1.143 markus 1830: if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN))
1.463 djm 1831: id = ssh_session2_open(ssh);
1.379 djm 1832: else {
1833: packet_set_interactive(
1834: options.control_master == SSHCTL_MASTER_NO,
1835: options.ip_qos_interactive, options.ip_qos_bulk);
1836: }
1.314 djm 1837:
1838: /* If we don't expect to open a new session, then disallow it */
1.319 markus 1839: if (options.control_master == SSHCTL_MASTER_NO &&
1840: (datafellows & SSH_NEW_OPENSSH)) {
1.314 djm 1841: debug("Requesting no-more-sessions@openssh.com");
1842: packet_start(SSH2_MSG_GLOBAL_REQUEST);
1843: packet_put_cstring("no-more-sessions@openssh.com");
1844: packet_put_char(0);
1845: packet_send();
1846: }
1.255 reyk 1847:
1848: /* Execute a local command */
1849: if (options.local_command != NULL &&
1850: options.permit_local_command)
1851: ssh_local_cmd(options.local_command);
1.467 ! djm 1852:
! 1853: /*
! 1854: * stdout is now owned by the session channel; clobber it here
! 1855: * so future channel closes are propagated to the local fd.
! 1856: * NB. this can only happen after LocalCommand has completed,
! 1857: * as it may want to write to stdout.
! 1858: */
! 1859: if ((devnull = open(_PATH_DEVNULL, O_WRONLY)) == -1)
! 1860: error("%s: open %s: %s", __func__,
! 1861: _PATH_DEVNULL, strerror(errno));
! 1862: if (dup2(devnull, STDOUT_FILENO) < 0)
! 1863: fatal("%s: dup2() stdout failed", __func__);
! 1864: if (devnull > STDERR_FILENO)
! 1865: close(devnull);
1.301 djm 1866:
1.342 djm 1867: /*
1868: * If requested and we are not interested in replies to remote
1869: * forwarding requests, then let ssh continue in the background.
1870: */
1.344 djm 1871: if (fork_after_authentication_flag) {
1872: if (options.exit_on_forward_failure &&
1873: options.num_remote_forwards > 0) {
1874: debug("deferring postauth fork until remote forward "
1875: "confirmation received");
1876: } else
1877: fork_postauth();
1.318 djm 1878: }
1.31 markus 1879:
1.463 djm 1880: return client_loop(ssh, tty_flag, tty_flag ?
1.119 stevesk 1881: options.escape_char : SSH_ESCAPECHAR_NONE, id);
1.72 markus 1882: }
1883:
1.426 djm 1884: /* Loads all IdentityFile and CertificateFile keys */
1.126 itojun 1885: static void
1.466 djm 1886: load_public_identity_files(struct passwd *pw)
1.104 markus 1887: {
1.466 djm 1888: char *filename, *cp;
1.460 markus 1889: struct sshkey *public;
1.426 djm 1890: int i;
1891: u_int n_ids, n_certs;
1.335 djm 1892: char *identity_files[SSH_MAX_IDENTITY_FILES];
1.460 markus 1893: struct sshkey *identity_keys[SSH_MAX_IDENTITY_FILES];
1.426 djm 1894: char *certificate_files[SSH_MAX_CERTIFICATE_FILES];
1895: struct sshkey *certificates[SSH_MAX_CERTIFICATE_FILES];
1.333 markus 1896: #ifdef ENABLE_PKCS11
1.460 markus 1897: struct sshkey **keys;
1.333 markus 1898: int nkeys;
1.335 djm 1899: #endif /* PKCS11 */
1.104 markus 1900:
1.426 djm 1901: n_ids = n_certs = 0;
1.398 tedu 1902: memset(identity_files, 0, sizeof(identity_files));
1903: memset(identity_keys, 0, sizeof(identity_keys));
1.426 djm 1904: memset(certificate_files, 0, sizeof(certificate_files));
1905: memset(certificates, 0, sizeof(certificates));
1.335 djm 1906:
1907: #ifdef ENABLE_PKCS11
1.333 markus 1908: if (options.pkcs11_provider != NULL &&
1.167 markus 1909: options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
1.333 markus 1910: (pkcs11_init(!options.batch_mode) == 0) &&
1911: (nkeys = pkcs11_add_provider(options.pkcs11_provider, NULL,
1912: &keys)) > 0) {
1913: for (i = 0; i < nkeys; i++) {
1.335 djm 1914: if (n_ids >= SSH_MAX_IDENTITY_FILES) {
1915: key_free(keys[i]);
1916: continue;
1917: }
1918: identity_keys[n_ids] = keys[i];
1919: identity_files[n_ids] =
1.333 markus 1920: xstrdup(options.pkcs11_provider); /* XXX */
1.335 djm 1921: n_ids++;
1.167 markus 1922: }
1.378 djm 1923: free(keys);
1.127 markus 1924: }
1.333 markus 1925: #endif /* ENABLE_PKCS11 */
1.275 djm 1926: if ((pw = getpwuid(original_real_uid)) == NULL)
1927: fatal("load_public_identity_files: getpwuid failed");
1.335 djm 1928: for (i = 0; i < options.num_identity_files; i++) {
1.373 djm 1929: if (n_ids >= SSH_MAX_IDENTITY_FILES ||
1930: strcasecmp(options.identity_files[i], "none") == 0) {
1.378 djm 1931: free(options.identity_files[i]);
1.426 djm 1932: options.identity_files[i] = NULL;
1.335 djm 1933: continue;
1934: }
1.275 djm 1935: cp = tilde_expand_filename(options.identity_files[i],
1.131 millert 1936: original_real_uid);
1.466 djm 1937: filename = percent_expand(cp, "d", pw->pw_dir,
1938: "u", pw->pw_name, "l", thishost, "h", host,
1.275 djm 1939: "r", options.user, (char *)NULL);
1.378 djm 1940: free(cp);
1.131 millert 1941: public = key_load_public(filename, NULL);
1942: debug("identity file %s type %d", filename,
1943: public ? public->type : -1);
1.378 djm 1944: free(options.identity_files[i]);
1.335 djm 1945: identity_files[n_ids] = filename;
1946: identity_keys[n_ids] = public;
1947:
1948: if (++n_ids >= SSH_MAX_IDENTITY_FILES)
1949: continue;
1950:
1.426 djm 1951: /*
1952: * If no certificates have been explicitly listed then try
1953: * to add the default certificate variant too.
1954: */
1955: if (options.num_certificate_files != 0)
1956: continue;
1.335 djm 1957: xasprintf(&cp, "%s-cert", filename);
1958: public = key_load_public(cp, NULL);
1959: debug("identity file %s type %d", cp,
1960: public ? public->type : -1);
1961: if (public == NULL) {
1.378 djm 1962: free(cp);
1.335 djm 1963: continue;
1964: }
1965: if (!key_is_cert(public)) {
1966: debug("%s: key %s type %s is not a certificate",
1967: __func__, cp, key_type(public));
1968: key_free(public);
1.378 djm 1969: free(cp);
1.335 djm 1970: continue;
1971: }
1.448 djm 1972: /* NB. leave filename pointing to private key */
1973: identity_files[n_ids] = xstrdup(filename);
1.335 djm 1974: identity_keys[n_ids] = public;
1975: n_ids++;
1976: }
1.426 djm 1977:
1978: if (options.num_certificate_files > SSH_MAX_CERTIFICATE_FILES)
1979: fatal("%s: too many certificates", __func__);
1980: for (i = 0; i < options.num_certificate_files; i++) {
1981: cp = tilde_expand_filename(options.certificate_files[i],
1982: original_real_uid);
1.466 djm 1983: filename = percent_expand(cp, "d", pw->pw_dir,
1984: "u", pw->pw_name, "l", thishost, "h", host,
1.426 djm 1985: "r", options.user, (char *)NULL);
1986: free(cp);
1987:
1988: public = key_load_public(filename, NULL);
1989: debug("certificate file %s type %d", filename,
1990: public ? public->type : -1);
1991: free(options.certificate_files[i]);
1992: options.certificate_files[i] = NULL;
1993: if (public == NULL) {
1994: free(filename);
1995: continue;
1996: }
1997: if (!key_is_cert(public)) {
1998: debug("%s: key %s type %s is not a certificate",
1999: __func__, filename, key_type(public));
2000: key_free(public);
2001: free(filename);
2002: continue;
2003: }
2004: certificate_files[n_certs] = filename;
2005: certificates[n_certs] = public;
2006: ++n_certs;
2007: }
2008:
1.335 djm 2009: options.num_identity_files = n_ids;
2010: memcpy(options.identity_files, identity_files, sizeof(identity_files));
2011: memcpy(options.identity_keys, identity_keys, sizeof(identity_keys));
1.426 djm 2012:
2013: options.num_certificate_files = n_certs;
2014: memcpy(options.certificate_files,
2015: certificate_files, sizeof(certificate_files));
2016: memcpy(options.certificates, certificates, sizeof(certificates));
1.214 djm 2017: }
1.352 djm 2018:
2019: static void
2020: main_sigchld_handler(int sig)
2021: {
2022: int save_errno = errno;
2023: pid_t pid;
2024: int status;
2025:
2026: while ((pid = waitpid(-1, &status, WNOHANG)) > 0 ||
2027: (pid < 0 && errno == EINTR))
2028: ;
2029:
2030: signal(sig, main_sigchld_handler);
2031: errno = save_errno;
2032: }
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