Annotation of src/usr.bin/ssh/ssh.c, Revision 1.445
1.445 ! djm 1: /* $OpenBSD: ssh.c,v 1.444 2016/07/16 06:57:55 jmc 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 "ssh1.h"
75: #include "ssh2.h"
1.341 djm 76: #include "canohost.h"
1.84 markus 77: #include "compat.h"
78: #include "cipher.h"
1.405 djm 79: #include "digest.h"
1.1 deraadt 80: #include "packet.h"
81: #include "buffer.h"
1.123 markus 82: #include "channels.h"
1.49 markus 83: #include "key.h"
1.58 markus 84: #include "authfd.h"
1.49 markus 85: #include "authfile.h"
1.83 markus 86: #include "pathnames.h"
1.214 djm 87: #include "dispatch.h"
1.81 markus 88: #include "clientloop.h"
1.84 markus 89: #include "log.h"
1.406 millert 90: #include "misc.h"
1.84 markus 91: #include "readconf.h"
92: #include "sshconnect.h"
1.95 markus 93: #include "kex.h"
94: #include "mac.h"
1.213 deraadt 95: #include "sshpty.h"
1.212 djm 96: #include "match.h"
1.214 djm 97: #include "msg.h"
1.225 dtucker 98: #include "uidswap.h"
1.278 stevesk 99: #include "version.h"
1.412 djm 100: #include "ssherr.h"
1.420 djm 101: #include "myproposal.h"
1.49 markus 102:
1.333 markus 103: #ifdef ENABLE_PKCS11
104: #include "ssh-pkcs11.h"
1.137 jakob 105: #endif
1.127 markus 106:
1.49 markus 107: extern char *__progname;
1.1 deraadt 108:
1.316 djm 109: /* Flag indicating whether debug mode is on. May be set on the command line. */
1.1 deraadt 110: int debug_flag = 0;
111:
1.359 djm 112: /* Flag indicating whether a tty should be requested */
1.1 deraadt 113: int tty_flag = 0;
114:
1.45 markus 115: /* don't exec a shell */
116: int no_shell_flag = 0;
117:
1.33 markus 118: /*
119: * Flag indicating that nothing should be read from stdin. This can be set
120: * on the command line.
121: */
1.1 deraadt 122: int stdin_null_flag = 0;
123:
1.33 markus 124: /*
1.344 djm 125: * Flag indicating that the current process should be backgrounded and
126: * a new slave launched in the foreground for ControlPersist.
127: */
128: int need_controlpersist_detach = 0;
129:
130: /* Copies of flags for ControlPersist foreground slave */
1.359 djm 131: int ostdin_null_flag, ono_shell_flag, otty_flag, orequest_tty;
1.344 djm 132:
133: /*
1.33 markus 134: * Flag indicating that ssh should fork after authentication. This is useful
1.172 deraadt 135: * so that the passphrase can be entered manually, and then ssh goes to the
1.33 markus 136: * background.
137: */
1.1 deraadt 138: int fork_after_authentication_flag = 0;
139:
1.33 markus 140: /*
141: * General data structure for command line options and options configurable
142: * in configuration files. See readconf.h.
143: */
1.1 deraadt 144: Options options;
145:
1.139 markus 146: /* optional user configfile */
147: char *config = NULL;
148:
1.33 markus 149: /*
150: * Name of the host we are connecting to. This is the name given on the
151: * command line, or the HostName specified for the user-supplied name in a
152: * configuration file.
153: */
1.1 deraadt 154: char *host;
155:
1.22 provos 156: /* socket address the host resolves to */
1.37 markus 157: struct sockaddr_storage hostaddr;
1.1 deraadt 158:
1.112 markus 159: /* Private host keys. */
1.173 markus 160: Sensitive sensitive_data;
1.1 deraadt 161:
1.10 dugsong 162: /* Original real UID. */
163: uid_t original_real_uid;
1.177 markus 164: uid_t original_effective_uid;
1.1 deraadt 165:
1.45 markus 166: /* command to be executed */
167: Buffer command;
168:
1.85 djm 169: /* Should we execute a command or invoke a subsystem? */
170: int subsystem_flag = 0;
171:
1.170 markus 172: /* # of replies received for global requests */
1.315 djm 173: static int remote_forward_confirms_received = 0;
1.170 markus 174:
1.313 djm 175: /* mux.c */
176: extern int muxserver_sock;
177: extern u_int muxclient_command;
178:
1.1 deraadt 179: /* Prints a help message to the user. This function never returns. */
180:
1.126 itojun 181: static void
1.93 itojun 182: usage(void)
1.1 deraadt 183: {
1.208 markus 184: fprintf(stderr,
1.409 jmc 185: "usage: ssh [-1246AaCfGgKkMNnqsTtVvXxYy] [-b bind_address] [-c cipher_spec]\n"
1.375 dtucker 186: " [-D [bind_address:]port] [-E log_file] [-e escape_char]\n"
1.444 jmc 187: " [-F configfile] [-I pkcs11] [-i identity_file]\n"
188: " [-J [user@]host[:port]] [-L address] [-l login_name] [-m mac_spec]\n"
189: " [-O ctl_cmd] [-o option] [-p port] [-Q query_option] [-R address]\n"
190: " [-S ctl_path] [-W host:port] [-w local_tun[:remote_tun]]\n"
191: " [user@]hostname [command]\n"
1.208 markus 192: );
1.257 dtucker 193: exit(255);
1.1 deraadt 194: }
195:
1.126 itojun 196: static int ssh_session(void);
197: static int ssh_session2(void);
198: static void load_public_identity_files(void);
1.352 djm 199: static void main_sigchld_handler(int);
1.312 djm 200:
201: /* from muxclient.c */
202: void muxclient(const char *);
203: void muxserver_listen(void);
1.45 markus 204:
1.361 djm 205: /* ~/ expand a list of paths. NB. assumes path[n] is heap-allocated. */
206: static void
207: tilde_expand_paths(char **paths, u_int num_paths)
208: {
209: u_int i;
210: char *cp;
211:
212: for (i = 0; i < num_paths; i++) {
213: cp = tilde_expand_filename(paths[i], original_real_uid);
1.378 djm 214: free(paths[i]);
1.361 djm 215: paths[i] = cp;
216: }
217: }
218:
1.400 djm 219: /*
220: * Attempt to resolve a host name / port to a set of addresses and
221: * optionally return any CNAMEs encountered along the way.
222: * Returns NULL on failure.
223: * NB. this function must operate with a options having undefined members.
224: */
1.385 djm 225: static struct addrinfo *
1.400 djm 226: resolve_host(const char *name, int port, int logerr, char *cname, size_t clen)
1.385 djm 227: {
228: char strport[NI_MAXSERV];
229: struct addrinfo hints, *res;
230: int gaierr, loglevel = SYSLOG_LEVEL_DEBUG1;
231:
1.400 djm 232: if (port <= 0)
233: port = default_ssh_port();
234:
1.427 djm 235: snprintf(strport, sizeof strport, "%d", port);
1.398 tedu 236: memset(&hints, 0, sizeof(hints));
1.400 djm 237: hints.ai_family = options.address_family == -1 ?
238: AF_UNSPEC : options.address_family;
1.385 djm 239: hints.ai_socktype = SOCK_STREAM;
240: if (cname != NULL)
241: hints.ai_flags = AI_CANONNAME;
242: if ((gaierr = getaddrinfo(name, strport, &hints, &res)) != 0) {
243: if (logerr || (gaierr != EAI_NONAME && gaierr != EAI_NODATA))
244: loglevel = SYSLOG_LEVEL_ERROR;
245: do_log2(loglevel, "%s: Could not resolve hostname %.100s: %s",
246: __progname, name, ssh_gai_strerror(gaierr));
247: return NULL;
248: }
249: if (cname != NULL && res->ai_canonname != NULL) {
250: if (strlcpy(cname, res->ai_canonname, clen) >= clen) {
251: error("%s: host \"%s\" cname \"%s\" too long (max %lu)",
252: __func__, name, res->ai_canonname, (u_long)clen);
253: if (clen > 0)
254: *cname = '\0';
255: }
256: }
257: return res;
258: }
259:
260: /*
1.413 djm 261: * Attempt to resolve a numeric host address / port to a single address.
262: * Returns a canonical address string.
263: * Returns NULL on failure.
264: * NB. this function must operate with a options having undefined members.
265: */
266: static struct addrinfo *
267: resolve_addr(const char *name, int port, char *caddr, size_t clen)
268: {
269: char addr[NI_MAXHOST], strport[NI_MAXSERV];
270: struct addrinfo hints, *res;
271: int gaierr;
272:
273: if (port <= 0)
274: port = default_ssh_port();
275: snprintf(strport, sizeof strport, "%u", port);
276: memset(&hints, 0, sizeof(hints));
277: hints.ai_family = options.address_family == -1 ?
278: AF_UNSPEC : options.address_family;
279: hints.ai_socktype = SOCK_STREAM;
280: hints.ai_flags = AI_NUMERICHOST|AI_NUMERICSERV;
281: if ((gaierr = getaddrinfo(name, strport, &hints, &res)) != 0) {
282: debug2("%s: could not resolve name %.100s as address: %s",
283: __func__, name, ssh_gai_strerror(gaierr));
284: return NULL;
285: }
286: if (res == NULL) {
287: debug("%s: getaddrinfo %.100s returned no addresses",
288: __func__, name);
289: return NULL;
290: }
291: if (res->ai_next != NULL) {
292: debug("%s: getaddrinfo %.100s returned multiple addresses",
293: __func__, name);
294: goto fail;
295: }
296: if ((gaierr = getnameinfo(res->ai_addr, res->ai_addrlen,
297: addr, sizeof(addr), NULL, 0, NI_NUMERICHOST)) != 0) {
298: debug("%s: Could not format address for name %.100s: %s",
299: __func__, name, ssh_gai_strerror(gaierr));
300: goto fail;
301: }
302: if (strlcpy(caddr, addr, clen) >= clen) {
303: error("%s: host \"%s\" addr \"%s\" too long (max %lu)",
304: __func__, name, addr, (u_long)clen);
305: if (clen > 0)
306: *caddr = '\0';
307: fail:
308: freeaddrinfo(res);
309: return NULL;
310: }
311: return res;
312: }
313:
314: /*
1.385 djm 315: * Check whether the cname is a permitted replacement for the hostname
316: * and perform the replacement if it is.
1.400 djm 317: * NB. this function must operate with a options having undefined members.
1.385 djm 318: */
319: static int
1.443 djm 320: check_follow_cname(int direct, char **namep, const char *cname)
1.385 djm 321: {
322: int i;
323: struct allowed_cname *rule;
324:
325: if (*cname == '\0' || options.num_permitted_cnames == 0 ||
326: strcmp(*namep, cname) == 0)
327: return 0;
1.386 djm 328: if (options.canonicalize_hostname == SSH_CANONICALISE_NO)
1.385 djm 329: return 0;
330: /*
1.386 djm 331: * Don't attempt to canonicalize names that will be interpreted by
1.443 djm 332: * a proxy or jump host unless the user specifically requests so.
1.385 djm 333: */
1.443 djm 334: if (!direct &&
1.386 djm 335: options.canonicalize_hostname != SSH_CANONICALISE_ALWAYS)
1.385 djm 336: return 0;
337: debug3("%s: check \"%s\" CNAME \"%s\"", __func__, *namep, cname);
338: for (i = 0; i < options.num_permitted_cnames; i++) {
339: rule = options.permitted_cnames + i;
1.418 djm 340: if (match_pattern_list(*namep, rule->source_list, 1) != 1 ||
341: match_pattern_list(cname, rule->target_list, 1) != 1)
1.385 djm 342: continue;
1.386 djm 343: verbose("Canonicalized DNS aliased hostname "
1.385 djm 344: "\"%s\" => \"%s\"", *namep, cname);
345: free(*namep);
346: *namep = xstrdup(cname);
347: return 1;
348: }
349: return 0;
350: }
351:
352: /*
353: * Attempt to resolve the supplied hostname after applying the user's
1.387 djm 354: * canonicalization rules. Returns the address list for the host or NULL
355: * if no name was found after canonicalization.
1.400 djm 356: * NB. this function must operate with a options having undefined members.
1.385 djm 357: */
358: static struct addrinfo *
1.400 djm 359: resolve_canonicalize(char **hostp, int port)
1.385 djm 360: {
1.443 djm 361: int i, direct, ndots;
1.413 djm 362: char *cp, *fullhost, newname[NI_MAXHOST];
1.385 djm 363: struct addrinfo *addrs;
364:
1.386 djm 365: if (options.canonicalize_hostname == SSH_CANONICALISE_NO)
1.385 djm 366: return NULL;
1.400 djm 367:
1.385 djm 368: /*
1.386 djm 369: * Don't attempt to canonicalize names that will be interpreted by
1.385 djm 370: * a proxy unless the user specifically requests so.
371: */
1.443 djm 372: direct = option_clear_or_none(options.proxy_command) &&
373: options.jump_host == NULL;
374: if (!direct &&
1.386 djm 375: options.canonicalize_hostname != SSH_CANONICALISE_ALWAYS)
1.385 djm 376: return NULL;
1.400 djm 377:
1.413 djm 378: /* Try numeric hostnames first */
379: if ((addrs = resolve_addr(*hostp, port,
380: newname, sizeof(newname))) != NULL) {
381: debug2("%s: hostname %.100s is address", __func__, *hostp);
382: if (strcasecmp(*hostp, newname) != 0) {
383: debug2("%s: canonicalised address \"%s\" => \"%s\"",
384: __func__, *hostp, newname);
385: free(*hostp);
386: *hostp = xstrdup(newname);
387: }
388: return addrs;
389: }
390:
1.428 djm 391: /* If domain name is anchored, then resolve it now */
392: if ((*hostp)[strlen(*hostp) - 1] == '.') {
393: debug3("%s: name is fully qualified", __func__);
394: fullhost = xstrdup(*hostp);
395: if ((addrs = resolve_host(fullhost, port, 0,
396: newname, sizeof(newname))) != NULL)
397: goto found;
398: free(fullhost);
399: goto notfound;
400: }
401:
1.387 djm 402: /* Don't apply canonicalization to sufficiently-qualified hostnames */
1.385 djm 403: ndots = 0;
404: for (cp = *hostp; *cp != '\0'; cp++) {
405: if (*cp == '.')
406: ndots++;
407: }
1.386 djm 408: if (ndots > options.canonicalize_max_dots) {
409: debug3("%s: not canonicalizing hostname \"%s\" (max dots %d)",
410: __func__, *hostp, options.canonicalize_max_dots);
1.385 djm 411: return NULL;
412: }
413: /* Attempt each supplied suffix */
414: for (i = 0; i < options.num_canonical_domains; i++) {
1.413 djm 415: *newname = '\0';
1.385 djm 416: xasprintf(&fullhost, "%s.%s.", *hostp,
417: options.canonical_domains[i]);
1.400 djm 418: debug3("%s: attempting \"%s\" => \"%s\"", __func__,
419: *hostp, fullhost);
420: if ((addrs = resolve_host(fullhost, port, 0,
1.413 djm 421: newname, sizeof(newname))) == NULL) {
1.385 djm 422: free(fullhost);
423: continue;
424: }
1.428 djm 425: found:
1.385 djm 426: /* Remove trailing '.' */
427: fullhost[strlen(fullhost) - 1] = '\0';
428: /* Follow CNAME if requested */
1.443 djm 429: if (!check_follow_cname(direct, &fullhost, newname)) {
1.386 djm 430: debug("Canonicalized hostname \"%s\" => \"%s\"",
1.385 djm 431: *hostp, fullhost);
432: }
433: free(*hostp);
434: *hostp = fullhost;
435: return addrs;
436: }
1.428 djm 437: notfound:
1.386 djm 438: if (!options.canonicalize_fallback_local)
1.400 djm 439: fatal("%s: Could not resolve host \"%s\"", __progname, *hostp);
440: debug2("%s: host %s not found in any suffix", __func__, *hostp);
1.385 djm 441: return NULL;
442: }
443:
1.32 deraadt 444: /*
1.400 djm 445: * Read per-user configuration file. Ignore the system wide config
446: * file if the user specifies a config file on the command line.
447: */
448: static void
1.408 djm 449: process_config_files(const char *host_arg, struct passwd *pw, int post_canon)
1.400 djm 450: {
1.414 deraadt 451: char buf[PATH_MAX];
1.400 djm 452: int r;
453:
454: if (config != NULL) {
455: if (strcasecmp(config, "none") != 0 &&
1.408 djm 456: !read_config_file(config, pw, host, host_arg, &options,
457: SSHCONF_USERCONF | (post_canon ? SSHCONF_POSTCANON : 0)))
1.400 djm 458: fatal("Can't open user config file %.100s: "
459: "%.100s", config, strerror(errno));
460: } else {
461: r = snprintf(buf, sizeof buf, "%s/%s", pw->pw_dir,
462: _PATH_SSH_USER_CONFFILE);
463: if (r > 0 && (size_t)r < sizeof(buf))
1.408 djm 464: (void)read_config_file(buf, pw, host, host_arg,
465: &options, SSHCONF_CHECKPERM | SSHCONF_USERCONF |
466: (post_canon ? SSHCONF_POSTCANON : 0));
1.400 djm 467:
468: /* Read systemwide configuration file after user config. */
1.408 djm 469: (void)read_config_file(_PATH_HOST_CONFIG_FILE, pw,
470: host, host_arg, &options,
471: post_canon ? SSHCONF_POSTCANON : 0);
472: }
473: }
474:
475: /* Rewrite the port number in an addrinfo list of addresses */
476: static void
477: set_addrinfo_port(struct addrinfo *addrs, int port)
478: {
479: struct addrinfo *addr;
480:
481: for (addr = addrs; addr != NULL; addr = addr->ai_next) {
482: switch (addr->ai_family) {
483: case AF_INET:
484: ((struct sockaddr_in *)addr->ai_addr)->
485: sin_port = htons(port);
486: break;
487: case AF_INET6:
488: ((struct sockaddr_in6 *)addr->ai_addr)->
489: sin6_port = htons(port);
490: break;
491: }
1.400 djm 492: }
493: }
494:
495: /*
1.32 deraadt 496: * Main program for the ssh client.
497: */
1.2 provos 498: int
499: main(int ac, char **av)
1.1 deraadt 500: {
1.437 djm 501: struct ssh *ssh = NULL;
1.443 djm 502: int i, r, opt, exit_status, use_syslog, direct, config_test = 0;
1.414 deraadt 503: char *p, *cp, *line, *argv0, buf[PATH_MAX], *host_arg, *logfile;
1.358 djm 504: char thishost[NI_MAXHOST], shorthost[NI_MAXHOST], portstr[NI_MAXSERV];
1.423 djm 505: char cname[NI_MAXHOST], uidstr[32], *conn_hash_hex;
1.31 markus 506: struct stat st;
1.98 markus 507: struct passwd *pw;
1.382 djm 508: int timeout_ms;
1.144 stevesk 509: extern int optind, optreset;
510: extern char *optarg;
1.406 millert 511: struct Forward fwd;
1.385 djm 512: struct addrinfo *addrs = NULL;
1.405 djm 513: struct ssh_digest_ctx *md;
514: u_char conn_hash[SSH_DIGEST_MAX_LENGTH];
1.250 djm 515:
1.436 dtucker 516: ssh_malloc_init(); /* must be called before any mallocs */
1.250 djm 517: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
518: sanitise_stdfd();
1.31 markus 519:
1.33 markus 520: /*
1.346 djm 521: * Discard other fds that are hanging around. These can cause problem
522: * with backgrounded ssh processes started by ControlPersist.
523: */
524: closefrom(STDERR_FILENO + 1);
525:
526: /*
1.33 markus 527: * Save the original real uid. It will be needed later (uid-swapping
528: * may clobber the real uid).
529: */
1.31 markus 530: original_real_uid = getuid();
531: original_effective_uid = geteuid();
532:
1.184 stevesk 533: /*
534: * Use uid-swapping to give up root privileges for the duration of
535: * option processing. We will re-instantiate the rights when we are
536: * ready to create the privileged port, and will permanently drop
537: * them when the port has been created (actually, when the connection
538: * has been made, as we may need to create the port several times).
539: */
540: PRIV_END;
541:
1.31 markus 542: /* If we are installed setuid root be careful to not drop core. */
543: if (original_real_uid != original_effective_uid) {
544: struct rlimit rlim;
545: rlim.rlim_cur = rlim.rlim_max = 0;
546: if (setrlimit(RLIMIT_CORE, &rlim) < 0)
547: fatal("setrlimit failed: %.100s", strerror(errno));
1.1 deraadt 548: }
1.107 markus 549: /* Get user data. */
550: pw = getpwuid(original_real_uid);
551: if (!pw) {
1.380 djm 552: logit("No user exists for uid %lu", (u_long)original_real_uid);
1.257 dtucker 553: exit(255);
1.107 markus 554: }
555: /* Take a copy of the returned structure. */
556: pw = pwcopy(pw);
1.31 markus 557:
1.33 markus 558: /*
559: * Set our umask to something reasonable, as some files are created
560: * with the default umask. This will make them world-readable but
561: * writable only by the owner, which is ok for all files for which we
562: * don't set the modes explicitly.
563: */
1.31 markus 564: umask(022);
1.445 ! djm 565:
! 566: setlocale(LC_CTYPE, "");
1.31 markus 567:
1.316 djm 568: /*
569: * Initialize option structure to indicate that no values have been
570: * set.
571: */
1.31 markus 572: initialize_options(&options);
573:
574: /* Parse command-line arguments. */
575: host = NULL;
1.320 djm 576: use_syslog = 0;
1.375 dtucker 577: logfile = NULL;
1.325 markus 578: argv0 = av[0];
1.31 markus 579:
1.266 djm 580: again:
1.316 djm 581: while ((opt = getopt(ac, av, "1246ab:c:e:fgi:kl:m:no:p:qstvx"
1.443 djm 582: "ACD:E:F:GI:J:KL:MNO:PQ:R:S:TVw:W:XYy")) != -1) {
1.31 markus 583: switch (opt) {
1.91 jakob 584: case '1':
585: options.protocol = SSH_PROTO_1;
586: break;
1.47 markus 587: case '2':
588: options.protocol = SSH_PROTO_2;
589: break;
1.37 markus 590: case '4':
1.196 djm 591: options.address_family = AF_INET;
1.37 markus 592: break;
593: case '6':
1.196 djm 594: options.address_family = AF_INET6;
1.37 markus 595: break;
1.31 markus 596: case 'n':
597: stdin_null_flag = 1;
598: break;
599: case 'f':
600: fork_after_authentication_flag = 1;
601: stdin_null_flag = 1;
602: break;
603: case 'x':
604: options.forward_x11 = 0;
605: break;
606: case 'X':
607: options.forward_x11 = 1;
608: break;
1.320 djm 609: case 'y':
610: use_syslog = 1;
611: break;
1.375 dtucker 612: case 'E':
1.422 dtucker 613: logfile = optarg;
1.375 dtucker 614: break;
1.408 djm 615: case 'G':
616: config_test = 1;
617: break;
1.202 markus 618: case 'Y':
619: options.forward_x11 = 1;
620: options.forward_x11_trusted = 1;
621: break;
1.31 markus 622: case 'g':
1.406 millert 623: options.fwd_opts.gateway_ports = 1;
1.31 markus 624: break;
1.229 djm 625: case 'O':
1.441 dtucker 626: if (options.stdio_forward_host != NULL)
1.332 djm 627: fatal("Cannot specify multiplexing "
628: "command with -W");
629: else if (muxclient_command != 0)
630: fatal("Multiplexing command already specified");
1.229 djm 631: if (strcmp(optarg, "check") == 0)
1.312 djm 632: muxclient_command = SSHMUX_COMMAND_ALIVE_CHECK;
1.338 markus 633: else if (strcmp(optarg, "forward") == 0)
634: muxclient_command = SSHMUX_COMMAND_FORWARD;
1.229 djm 635: else if (strcmp(optarg, "exit") == 0)
1.312 djm 636: muxclient_command = SSHMUX_COMMAND_TERMINATE;
1.357 djm 637: else if (strcmp(optarg, "stop") == 0)
638: muxclient_command = SSHMUX_COMMAND_STOP;
1.365 djm 639: else if (strcmp(optarg, "cancel") == 0)
640: muxclient_command = SSHMUX_COMMAND_CANCEL_FWD;
1.229 djm 641: else
642: fatal("Invalid multiplex command.");
643: break;
1.183 stevesk 644: case 'P': /* deprecated */
1.31 markus 645: options.use_privileged_port = 0;
1.376 djm 646: break;
1.394 deraadt 647: case 'Q':
1.376 djm 648: cp = NULL;
1.394 deraadt 649: if (strcmp(optarg, "cipher") == 0)
1.393 djm 650: cp = cipher_alg_list('\n', 0);
1.394 deraadt 651: else if (strcmp(optarg, "cipher-auth") == 0)
1.393 djm 652: cp = cipher_alg_list('\n', 1);
1.394 deraadt 653: else if (strcmp(optarg, "mac") == 0)
1.392 dtucker 654: cp = mac_alg_list('\n');
1.394 deraadt 655: else if (strcmp(optarg, "kex") == 0)
1.392 dtucker 656: cp = kex_alg_list('\n');
1.394 deraadt 657: else if (strcmp(optarg, "key") == 0)
1.396 markus 658: cp = key_alg_list(0, 0);
659: else if (strcmp(optarg, "key-cert") == 0)
660: cp = key_alg_list(1, 0);
661: else if (strcmp(optarg, "key-plain") == 0)
662: cp = key_alg_list(0, 1);
1.416 djm 663: else if (strcmp(optarg, "protocol-version") == 0) {
664: #ifdef WITH_SSH1
665: cp = xstrdup("1\n2");
666: #else
667: cp = xstrdup("2");
668: #endif
669: }
1.376 djm 670: if (cp == NULL)
671: fatal("Unsupported query \"%s\"", optarg);
672: printf("%s\n", cp);
673: free(cp);
674: exit(0);
1.31 markus 675: break;
676: case 'a':
677: options.forward_agent = 0;
1.53 markus 678: break;
679: case 'A':
680: options.forward_agent = 1;
1.31 markus 681: break;
682: case 'k':
1.204 dtucker 683: options.gss_deleg_creds = 0;
1.297 djm 684: break;
685: case 'K':
686: options.gss_authentication = 1;
687: options.gss_deleg_creds = 1;
1.31 markus 688: break;
689: case 'i':
1.429 dtucker 690: p = tilde_expand_filename(optarg, original_real_uid);
691: if (stat(p, &st) < 0)
1.128 fgsch 692: fprintf(stderr, "Warning: Identity file %s "
1.429 dtucker 693: "not accessible: %s.\n", p,
1.231 otto 694: strerror(errno));
1.429 dtucker 695: else
696: add_identity_file(&options, NULL, p, 1);
697: free(p);
1.31 markus 698: break;
1.127 markus 699: case 'I':
1.333 markus 700: #ifdef ENABLE_PKCS11
1.422 dtucker 701: free(options.pkcs11_provider);
1.333 markus 702: options.pkcs11_provider = xstrdup(optarg);
1.137 jakob 703: #else
1.333 markus 704: fprintf(stderr, "no support for PKCS#11.\n");
1.137 jakob 705: #endif
1.127 markus 706: break;
1.443 djm 707: case 'J':
708: if (options.jump_host != NULL)
709: fatal("Only a single -J option permitted");
710: if (options.proxy_command != NULL)
711: fatal("Cannot specify -J with ProxyCommand");
712: if (parse_jump(optarg, &options, 1) == -1)
713: fatal("Invalid -J argument");
714: options.proxy_command = xstrdup("none");
715: break;
1.31 markus 716: case 't':
1.359 djm 717: if (options.request_tty == REQUEST_TTY_YES)
718: options.request_tty = REQUEST_TTY_FORCE;
719: else
720: options.request_tty = REQUEST_TTY_YES;
1.31 markus 721: break;
722: case 'v':
1.197 markus 723: if (debug_flag == 0) {
1.66 markus 724: debug_flag = 1;
725: options.log_level = SYSLOG_LEVEL_DEBUG1;
1.197 markus 726: } else {
1.443 djm 727: if (options.log_level < SYSLOG_LEVEL_DEBUG3) {
728: debug_flag++;
1.197 markus 729: options.log_level++;
1.443 djm 730: }
1.197 markus 731: }
1.375 dtucker 732: break;
1.31 markus 733: case 'V':
1.209 markus 734: fprintf(stderr, "%s, %s\n",
1.402 markus 735: SSH_VERSION,
736: #ifdef WITH_OPENSSL
737: SSLeay_version(SSLEAY_VERSION)
738: #else
739: "without OpenSSL"
740: #endif
741: );
1.31 markus 742: if (opt == 'V')
743: exit(0);
744: break;
1.255 reyk 745: case 'w':
1.256 reyk 746: if (options.tun_open == -1)
747: options.tun_open = SSH_TUNMODE_DEFAULT;
1.255 reyk 748: options.tun_local = a2tun(optarg, &options.tun_remote);
1.256 reyk 749: if (options.tun_local == SSH_TUNID_ERR) {
1.316 djm 750: fprintf(stderr,
751: "Bad tun device '%s'\n", optarg);
1.257 dtucker 752: exit(255);
1.255 reyk 753: }
754: break;
1.331 dtucker 755: case 'W':
1.441 dtucker 756: if (options.stdio_forward_host != NULL)
1.332 djm 757: fatal("stdio forward already specified");
758: if (muxclient_command != 0)
759: fatal("Cannot specify stdio forward with -O");
1.331 dtucker 760: if (parse_forward(&fwd, optarg, 1, 0)) {
1.441 dtucker 761: options.stdio_forward_host = fwd.listen_host;
762: options.stdio_forward_port = fwd.listen_port;
1.378 djm 763: free(fwd.connect_host);
1.331 dtucker 764: } else {
765: fprintf(stderr,
766: "Bad stdio forwarding specification '%s'\n",
767: optarg);
768: exit(255);
769: }
1.359 djm 770: options.request_tty = REQUEST_TTY_NO;
1.331 dtucker 771: no_shell_flag = 1;
772: break;
1.31 markus 773: case 'q':
774: options.log_level = SYSLOG_LEVEL_QUIET;
775: break;
776: case 'e':
777: if (optarg[0] == '^' && optarg[2] == 0 &&
1.128 fgsch 778: (u_char) optarg[1] >= 64 &&
779: (u_char) optarg[1] < 128)
1.78 markus 780: options.escape_char = (u_char) optarg[1] & 31;
1.31 markus 781: else if (strlen(optarg) == 1)
1.78 markus 782: options.escape_char = (u_char) optarg[0];
1.31 markus 783: else if (strcmp(optarg, "none") == 0)
1.119 stevesk 784: options.escape_char = SSH_ESCAPECHAR_NONE;
1.31 markus 785: else {
1.128 fgsch 786: fprintf(stderr, "Bad escape character '%s'.\n",
787: optarg);
1.257 dtucker 788: exit(255);
1.31 markus 789: }
790: break;
791: case 'c':
1.420 djm 792: if (ciphers_valid(*optarg == '+' ?
793: optarg + 1 : optarg)) {
1.49 markus 794: /* SSH2 only */
1.422 dtucker 795: free(options.ciphers);
1.49 markus 796: options.ciphers = xstrdup(optarg);
1.224 markus 797: options.cipher = SSH_CIPHER_INVALID;
1.420 djm 798: break;
799: }
800: /* SSH1 only */
801: options.cipher = cipher_number(optarg);
802: if (options.cipher == -1) {
803: fprintf(stderr, "Unknown cipher type '%s'\n",
804: optarg);
805: exit(255);
1.95 markus 806: }
1.420 djm 807: if (options.cipher == SSH_CIPHER_3DES)
808: options.ciphers = xstrdup("3des-cbc");
809: else if (options.cipher == SSH_CIPHER_BLOWFISH)
810: options.ciphers = xstrdup("blowfish-cbc");
811: else
812: options.ciphers = xstrdup(KEX_CLIENT_ENCRYPT);
1.95 markus 813: break;
814: case 'm':
1.422 dtucker 815: if (mac_valid(optarg)) {
816: free(options.macs);
1.95 markus 817: options.macs = xstrdup(optarg);
1.422 dtucker 818: } else {
1.128 fgsch 819: fprintf(stderr, "Unknown mac type '%s'\n",
820: optarg);
1.257 dtucker 821: exit(255);
1.31 markus 822: }
823: break;
1.214 djm 824: case 'M':
1.242 djm 825: if (options.control_master == SSHCTL_MASTER_YES)
826: options.control_master = SSHCTL_MASTER_ASK;
827: else
828: options.control_master = SSHCTL_MASTER_YES;
1.214 djm 829: break;
1.31 markus 830: case 'p':
1.113 stevesk 831: options.port = a2port(optarg);
1.323 djm 832: if (options.port <= 0) {
1.109 markus 833: fprintf(stderr, "Bad port '%s'\n", optarg);
1.257 dtucker 834: exit(255);
1.109 markus 835: }
1.31 markus 836: break;
837: case 'l':
838: options.user = optarg;
839: break;
1.141 stevesk 840:
841: case 'L':
1.324 djm 842: if (parse_forward(&fwd, optarg, 0, 0))
1.232 djm 843: add_local_forward(&options, &fwd);
844: else {
1.128 fgsch 845: fprintf(stderr,
1.232 djm 846: "Bad local forwarding specification '%s'\n",
1.128 fgsch 847: optarg);
1.257 dtucker 848: exit(255);
1.31 markus 849: }
1.232 djm 850: break;
851:
852: case 'R':
1.324 djm 853: if (parse_forward(&fwd, optarg, 0, 1)) {
1.232 djm 854: add_remote_forward(&options, &fwd);
855: } else {
1.128 fgsch 856: fprintf(stderr,
1.232 djm 857: "Bad remote forwarding specification "
858: "'%s'\n", optarg);
1.257 dtucker 859: exit(255);
1.31 markus 860: }
861: break;
1.108 markus 862:
863: case 'D':
1.324 djm 864: if (parse_forward(&fwd, optarg, 1, 0)) {
1.322 stevesk 865: add_local_forward(&options, &fwd);
1.232 djm 866: } else {
1.322 stevesk 867: fprintf(stderr,
868: "Bad dynamic forwarding specification "
869: "'%s'\n", optarg);
1.257 dtucker 870: exit(255);
1.109 markus 871: }
1.108 markus 872: break;
873:
1.31 markus 874: case 'C':
875: options.compression = 1;
876: break;
1.45 markus 877: case 'N':
878: no_shell_flag = 1;
1.359 djm 879: options.request_tty = REQUEST_TTY_NO;
1.45 markus 880: break;
881: case 'T':
1.359 djm 882: options.request_tty = REQUEST_TTY_NO;
1.45 markus 883: break;
1.31 markus 884: case 'o':
1.205 markus 885: line = xstrdup(optarg);
1.408 djm 886: if (process_config_line(&options, pw,
887: host ? host : "", host ? host : "", line,
888: "command-line", 0, NULL, SSHCONF_USERCONF) != 0)
1.257 dtucker 889: exit(255);
1.378 djm 890: free(line);
1.31 markus 891: break;
1.85 djm 892: case 's':
893: subsystem_flag = 1;
1.117 markus 894: break;
1.214 djm 895: case 'S':
1.431 mmcc 896: free(options.control_path);
1.214 djm 897: options.control_path = xstrdup(optarg);
898: break;
1.117 markus 899: case 'b':
900: options.bind_address = optarg;
1.85 djm 901: break;
1.139 markus 902: case 'F':
903: config = optarg;
904: break;
1.31 markus 905: default:
906: usage();
1.1 deraadt 907: }
1.31 markus 908: }
909:
1.128 fgsch 910: ac -= optind;
911: av += optind;
912:
1.329 guenther 913: if (ac > 0 && !host) {
1.188 markus 914: if (strrchr(*av, '@')) {
1.128 fgsch 915: p = xstrdup(*av);
1.188 markus 916: cp = strrchr(p, '@');
1.128 fgsch 917: if (cp == NULL || cp == p)
918: usage();
919: options.user = p;
920: *cp = '\0';
1.385 djm 921: host = xstrdup(++cp);
1.128 fgsch 922: } else
1.385 djm 923: host = xstrdup(*av);
1.189 millert 924: if (ac > 1) {
925: optind = optreset = 1;
1.128 fgsch 926: goto again;
927: }
1.189 millert 928: ac--, av++;
1.128 fgsch 929: }
930:
1.31 markus 931: /* Check that we got a host name. */
932: if (!host)
933: usage();
934:
1.385 djm 935: host_arg = xstrdup(host);
936:
1.402 markus 937: #ifdef WITH_OPENSSL
1.350 djm 938: OpenSSL_add_all_algorithms();
1.72 markus 939: ERR_load_crypto_strings();
1.402 markus 940: #endif
1.31 markus 941:
942: /* Initialize the command to execute on remote host. */
943: buffer_init(&command);
1.1 deraadt 944:
1.33 markus 945: /*
946: * Save the command to execute on the remote host in a buffer. There
947: * is no limit on the length of the command, except by the maximum
948: * packet size. Also sets the tty flag if there is no command.
949: */
1.128 fgsch 950: if (!ac) {
1.31 markus 951: /* No command specified - execute shell on a tty. */
1.85 djm 952: if (subsystem_flag) {
1.128 fgsch 953: fprintf(stderr,
954: "You must specify a subsystem to invoke.\n");
1.85 djm 955: usage();
956: }
1.31 markus 957: } else {
1.128 fgsch 958: /* A command has been specified. Store it into the buffer. */
959: for (i = 0; i < ac; i++) {
960: if (i)
1.31 markus 961: buffer_append(&command, " ", 1);
962: buffer_append(&command, av[i], strlen(av[i]));
963: }
964: }
965:
966: /* Cannot fork to background if no command. */
1.316 djm 967: if (fork_after_authentication_flag && buffer_len(&command) == 0 &&
968: !no_shell_flag)
969: fatal("Cannot fork into background without a command "
970: "to execute.");
1.31 markus 971:
1.101 markus 972: /*
973: * Initialize "log" output. Since we are the client all output
1.375 dtucker 974: * goes to stderr unless otherwise specified by -y or -E.
1.101 markus 975: */
1.375 dtucker 976: if (use_syslog && logfile != NULL)
977: fatal("Can't specify both -y and -E");
1.422 dtucker 978: if (logfile != NULL)
1.375 dtucker 979: log_redirect_stderr_to(logfile);
1.325 markus 980: log_init(argv0,
1.316 djm 981: options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level,
1.320 djm 982: SYSLOG_FACILITY_USER, !use_syslog);
1.375 dtucker 983:
984: if (debug_flag)
1.402 markus 985: logit("%s, %s", SSH_VERSION,
986: #ifdef WITH_OPENSSL
987: SSLeay_version(SSLEAY_VERSION)
988: #else
989: "without OpenSSL"
990: #endif
991: );
1.31 markus 992:
1.400 djm 993: /* Parse the configuration files */
1.408 djm 994: process_config_files(host_arg, pw, 0);
1.400 djm 995:
996: /* Hostname canonicalisation needs a few options filled. */
997: fill_default_options_for_canonicalization(&options);
998:
999: /* If the user has replaced the hostname then take it into use now */
1000: if (options.hostname != NULL) {
1001: /* NB. Please keep in sync with readconf.c:match_cfg_line() */
1002: cp = percent_expand(options.hostname,
1003: "h", host, (char *)NULL);
1004: free(host);
1005: host = cp;
1.408 djm 1006: free(options.hostname);
1007: options.hostname = xstrdup(host);
1.400 djm 1008: }
1009:
1010: /* If canonicalization requested then try to apply it */
1011: lowercase(host);
1012: if (options.canonicalize_hostname != SSH_CANONICALISE_NO)
1013: addrs = resolve_canonicalize(&host, options.port);
1014:
1.139 markus 1015: /*
1.401 djm 1016: * If CanonicalizePermittedCNAMEs have been specified but
1017: * other canonicalization did not happen (by not being requested
1018: * or by failing with fallback) then the hostname may still be changed
1019: * as a result of CNAME following.
1020: *
1021: * Try to resolve the bare hostname name using the system resolver's
1022: * usual search rules and then apply the CNAME follow rules.
1023: *
1024: * Skip the lookup if a ProxyCommand is being used unless the user
1025: * has specifically requested canonicalisation for this case via
1026: * CanonicalizeHostname=always
1.139 markus 1027: */
1.443 djm 1028: direct = option_clear_or_none(options.proxy_command) &&
1029: options.jump_host == NULL;
1030: if (addrs == NULL && options.num_permitted_cnames != 0 && (direct ||
1031: options.canonicalize_hostname == SSH_CANONICALISE_ALWAYS)) {
1.403 djm 1032: if ((addrs = resolve_host(host, options.port,
1033: option_clear_or_none(options.proxy_command),
1034: cname, sizeof(cname))) == NULL) {
1035: /* Don't fatal proxied host names not in the DNS */
1036: if (option_clear_or_none(options.proxy_command))
1037: cleanup_exit(255); /* logged in resolve_host */
1038: } else
1.443 djm 1039: check_follow_cname(direct, &host, cname);
1.400 djm 1040: }
1.139 markus 1041:
1.400 djm 1042: /*
1.408 djm 1043: * If canonicalisation is enabled then re-parse the configuration
1044: * files as new stanzas may match.
1.400 djm 1045: */
1.408 djm 1046: if (options.canonicalize_hostname != 0) {
1047: debug("Re-reading configuration after hostname "
1048: "canonicalisation");
1049: free(options.hostname);
1050: options.hostname = xstrdup(host);
1051: process_config_files(host_arg, pw, 1);
1052: /*
1053: * Address resolution happens early with canonicalisation
1054: * enabled and the port number may have changed since, so
1055: * reset it in address list
1056: */
1057: if (addrs != NULL && options.port > 0)
1058: set_addrinfo_port(addrs, options.port);
1.139 markus 1059: }
1.31 markus 1060:
1061: /* Fill configuration defaults. */
1062: fill_default_options(&options);
1.443 djm 1063:
1064: /*
1065: * If ProxyJump option specified, then construct a ProxyCommand now.
1066: */
1067: if (options.jump_host != NULL) {
1068: char port_s[8];
1069:
1070: /* Consistency check */
1071: if (options.proxy_command != NULL)
1072: fatal("inconsistent options: ProxyCommand+ProxyJump");
1073: /* Never use FD passing for ProxyJump */
1074: options.proxy_use_fdpass = 0;
1075: snprintf(port_s, sizeof(port_s), "%d", options.jump_port);
1076: xasprintf(&options.proxy_command,
1077: "ssh%s%s%s%s%s%s%s%s%s%.*s -W %%h:%%p %s",
1078: /* Optional "-l user" argument if jump_user set */
1079: options.jump_user == NULL ? "" : " -l ",
1080: options.jump_user == NULL ? "" : options.jump_user,
1081: /* Optional "-p port" argument if jump_port set */
1082: options.jump_port <= 0 ? "" : " -p ",
1083: options.jump_port <= 0 ? "" : port_s,
1084: /* Optional additional jump hosts ",..." */
1085: options.jump_extra == NULL ? "" : " -J ",
1086: options.jump_extra == NULL ? "" : options.jump_extra,
1087: /* Optional "-F" argumment if -F specified */
1088: config == NULL ? "" : " -F ",
1089: config == NULL ? "" : config,
1090: /* Optional "-v" arguments if -v set */
1091: debug_flag ? " -" : "",
1092: debug_flag, "vvv",
1093: /* Mandatory hostname */
1094: options.jump_host);
1095: debug("Setting implicit ProxyCommand from ProxyJump: %s",
1096: options.proxy_command);
1097: }
1.31 markus 1098:
1.400 djm 1099: if (options.port == 0)
1100: options.port = default_ssh_port();
1.196 djm 1101: channel_set_af(options.address_family);
1102:
1.383 djm 1103: /* Tidy and check options */
1104: if (options.host_key_alias != NULL)
1105: lowercase(options.host_key_alias);
1106: if (options.proxy_command != NULL &&
1107: strcmp(options.proxy_command, "-") == 0 &&
1108: options.proxy_use_fdpass)
1109: fatal("ProxyCommand=- and ProxyUseFDPass are incompatible");
1.415 djm 1110: if (options.control_persist &&
1111: options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK) {
1112: debug("UpdateHostKeys=ask is incompatible with ControlPersist; "
1113: "disabling");
1114: options.update_hostkeys = 0;
1115: }
1.430 djm 1116: if (options.connection_attempts <= 0)
1117: fatal("Invalid number of ConnectionAttempts");
1118:
1.388 djm 1119: if (original_effective_uid != 0)
1120: options.use_privileged_port = 0;
1.383 djm 1121:
1.31 markus 1122: /* reinit */
1.325 markus 1123: log_init(argv0, options.log_level, SYSLOG_FACILITY_USER, !use_syslog);
1.370 djm 1124:
1125: if (options.request_tty == REQUEST_TTY_YES ||
1126: options.request_tty == REQUEST_TTY_FORCE)
1127: tty_flag = 1;
1128:
1129: /* Allocate a tty by default if no command specified. */
1130: if (buffer_len(&command) == 0)
1131: tty_flag = options.request_tty != REQUEST_TTY_NO;
1132:
1133: /* Force no tty */
1134: if (options.request_tty == REQUEST_TTY_NO || muxclient_command != 0)
1135: tty_flag = 0;
1136: /* Do not allocate a tty if stdin is not a tty. */
1137: if ((!isatty(fileno(stdin)) || stdin_null_flag) &&
1138: options.request_tty != REQUEST_TTY_FORCE) {
1139: if (tty_flag)
1140: logit("Pseudo-terminal will not be allocated because "
1141: "stdin is not a terminal.");
1142: tty_flag = 0;
1143: }
1.31 markus 1144:
1145: if (options.user == NULL)
1146: options.user = xstrdup(pw->pw_name);
1.343 djm 1147:
1.358 djm 1148: if (gethostname(thishost, sizeof(thishost)) == -1)
1149: fatal("gethostname: %s", strerror(errno));
1150: strlcpy(shorthost, thishost, sizeof(shorthost));
1151: shorthost[strcspn(thishost, ".")] = '\0';
1152: snprintf(portstr, sizeof(portstr), "%d", options.port);
1.423 djm 1153: snprintf(uidstr, sizeof(uidstr), "%d", pw->pw_uid);
1.358 djm 1154:
1.405 djm 1155: if ((md = ssh_digest_start(SSH_DIGEST_SHA1)) == NULL ||
1156: ssh_digest_update(md, thishost, strlen(thishost)) < 0 ||
1157: ssh_digest_update(md, host, strlen(host)) < 0 ||
1158: ssh_digest_update(md, portstr, strlen(portstr)) < 0 ||
1159: ssh_digest_update(md, options.user, strlen(options.user)) < 0 ||
1160: ssh_digest_final(md, conn_hash, sizeof(conn_hash)) < 0)
1161: fatal("%s: mux digest failed", __func__);
1162: ssh_digest_free(md);
1163: conn_hash_hex = tohex(conn_hash, ssh_digest_bytes(SSH_DIGEST_SHA1));
1164:
1.317 dtucker 1165: if (options.local_command != NULL) {
1166: debug3("expanding LocalCommand: %s", options.local_command);
1167: cp = options.local_command;
1.405 djm 1168: options.local_command = percent_expand(cp,
1169: "C", conn_hash_hex,
1170: "L", shorthost,
1171: "d", pw->pw_dir,
1172: "h", host,
1173: "l", thishost,
1174: "n", host_arg,
1175: "p", portstr,
1176: "r", options.user,
1177: "u", pw->pw_name,
1.358 djm 1178: (char *)NULL);
1.317 dtucker 1179: debug3("expanded LocalCommand: %s", options.local_command);
1.378 djm 1180: free(cp);
1.304 dtucker 1181: }
1.31 markus 1182:
1.214 djm 1183: if (options.control_path != NULL) {
1.241 djm 1184: cp = tilde_expand_filename(options.control_path,
1185: original_real_uid);
1.378 djm 1186: free(options.control_path);
1.405 djm 1187: options.control_path = percent_expand(cp,
1188: "C", conn_hash_hex,
1189: "L", shorthost,
1190: "h", host,
1191: "l", thishost,
1192: "n", host_arg,
1193: "p", portstr,
1194: "r", options.user,
1195: "u", pw->pw_name,
1.423 djm 1196: "i", uidstr,
1.358 djm 1197: (char *)NULL);
1.378 djm 1198: free(cp);
1.214 djm 1199: }
1.405 djm 1200: free(conn_hash_hex);
1.408 djm 1201:
1202: if (config_test) {
1203: dump_client_config(&options, host);
1204: exit(0);
1205: }
1.405 djm 1206:
1.312 djm 1207: if (muxclient_command != 0 && options.control_path == NULL)
1.240 djm 1208: fatal("No ControlPath specified for \"-O\" command");
1.242 djm 1209: if (options.control_path != NULL)
1.312 djm 1210: muxclient(options.control_path);
1.401 djm 1211:
1212: /*
1213: * If hostname canonicalisation was not enabled, then we may not
1214: * have yet resolved the hostname. Do so now.
1215: */
1216: if (addrs == NULL && options.proxy_command == NULL) {
1.421 djm 1217: debug2("resolving \"%s\" port %d", host, options.port);
1.401 djm 1218: if ((addrs = resolve_host(host, options.port, 1,
1219: cname, sizeof(cname))) == NULL)
1220: cleanup_exit(255); /* resolve_host logs the error */
1221: }
1.214 djm 1222:
1.303 djm 1223: timeout_ms = options.connection_timeout * 1000;
1224:
1.77 markus 1225: /* Open a connection to the remote host. */
1.385 djm 1226: if (ssh_connect(host, addrs, &hostaddr, options.port,
1227: options.address_family, options.connection_attempts,
1228: &timeout_ms, options.tcp_keep_alive,
1.388 djm 1229: options.use_privileged_port) != 0)
1.257 dtucker 1230: exit(255);
1.31 markus 1231:
1.391 djm 1232: if (addrs != NULL)
1233: freeaddrinfo(addrs);
1234:
1.385 djm 1235: packet_set_timeout(options.server_alive_interval,
1236: options.server_alive_count_max);
1237:
1.437 djm 1238: ssh = active_state; /* XXX */
1239:
1.303 djm 1240: if (timeout_ms > 0)
1241: debug3("timeout: %d ms remain after connect", timeout_ms);
1242:
1.33 markus 1243: /*
1244: * If we successfully made the connection, load the host private key
1245: * in case we will need it later for combined rsa-rhosts
1246: * authentication. This must be done before releasing extra
1247: * privileges, because the file is only readable by root.
1.174 markus 1248: * If we cannot access the private keys, load the public keys
1249: * instead and try to execute the ssh-keysign helper instead.
1.33 markus 1250: */
1.112 markus 1251: sensitive_data.nkeys = 0;
1252: sensitive_data.keys = NULL;
1.173 markus 1253: sensitive_data.external_keysign = 0;
1.178 markus 1254: if (options.rhosts_rsa_authentication ||
1255: options.hostbased_authentication) {
1.397 djm 1256: sensitive_data.nkeys = 9;
1.274 deraadt 1257: sensitive_data.keys = xcalloc(sensitive_data.nkeys,
1.180 deraadt 1258: sizeof(Key));
1.177 markus 1259:
1260: PRIV_START;
1.432 djm 1261: #if WITH_SSH1
1.112 markus 1262: sensitive_data.keys[0] = key_load_private_type(KEY_RSA1,
1.276 dtucker 1263: _PATH_HOST_KEY_FILE, "", NULL, NULL);
1.432 djm 1264: #endif
1.411 djm 1265: sensitive_data.keys[1] = key_load_private_cert(KEY_ECDSA,
1.349 djm 1266: _PATH_HOST_ECDSA_KEY_FILE, "", NULL);
1.411 djm 1267: sensitive_data.keys[2] = key_load_private_cert(KEY_ED25519,
1268: _PATH_HOST_ED25519_KEY_FILE, "", NULL);
1.349 djm 1269: sensitive_data.keys[3] = key_load_private_cert(KEY_RSA,
1.345 djm 1270: _PATH_HOST_RSA_KEY_FILE, "", NULL);
1.411 djm 1271: sensitive_data.keys[4] = key_load_private_cert(KEY_DSA,
1272: _PATH_HOST_DSA_KEY_FILE, "", NULL);
1273: sensitive_data.keys[5] = key_load_private_type(KEY_ECDSA,
1.349 djm 1274: _PATH_HOST_ECDSA_KEY_FILE, "", NULL, NULL);
1.411 djm 1275: sensitive_data.keys[6] = key_load_private_type(KEY_ED25519,
1276: _PATH_HOST_ED25519_KEY_FILE, "", NULL, NULL);
1.397 djm 1277: sensitive_data.keys[7] = key_load_private_type(KEY_RSA,
1.276 dtucker 1278: _PATH_HOST_RSA_KEY_FILE, "", NULL, NULL);
1.411 djm 1279: sensitive_data.keys[8] = key_load_private_type(KEY_DSA,
1280: _PATH_HOST_DSA_KEY_FILE, "", NULL, NULL);
1.177 markus 1281: PRIV_END;
1.173 markus 1282:
1.181 markus 1283: if (options.hostbased_authentication == 1 &&
1284: sensitive_data.keys[0] == NULL &&
1.349 djm 1285: sensitive_data.keys[5] == NULL &&
1.396 markus 1286: sensitive_data.keys[6] == NULL &&
1.397 djm 1287: sensitive_data.keys[7] == NULL &&
1288: sensitive_data.keys[8] == NULL) {
1.345 djm 1289: sensitive_data.keys[1] = key_load_cert(
1.411 djm 1290: _PATH_HOST_ECDSA_KEY_FILE);
1.345 djm 1291: sensitive_data.keys[2] = key_load_cert(
1.411 djm 1292: _PATH_HOST_ED25519_KEY_FILE);
1.349 djm 1293: sensitive_data.keys[3] = key_load_cert(
1.345 djm 1294: _PATH_HOST_RSA_KEY_FILE);
1.397 djm 1295: sensitive_data.keys[4] = key_load_cert(
1.411 djm 1296: _PATH_HOST_DSA_KEY_FILE);
1.397 djm 1297: sensitive_data.keys[5] = key_load_public(
1.411 djm 1298: _PATH_HOST_ECDSA_KEY_FILE, NULL);
1.397 djm 1299: sensitive_data.keys[6] = key_load_public(
1.411 djm 1300: _PATH_HOST_ED25519_KEY_FILE, NULL);
1.397 djm 1301: sensitive_data.keys[7] = key_load_public(
1.173 markus 1302: _PATH_HOST_RSA_KEY_FILE, NULL);
1.397 djm 1303: sensitive_data.keys[8] = key_load_public(
1.411 djm 1304: _PATH_HOST_DSA_KEY_FILE, NULL);
1.173 markus 1305: sensitive_data.external_keysign = 1;
1306: }
1.31 markus 1307: }
1.33 markus 1308: /*
1309: * Get rid of any extra privileges that we may have. We will no
1310: * longer need them. Also, extra privileges could make it very hard
1311: * to read identity files and other non-world-readable files from the
1312: * user's home directory if it happens to be on a NFS volume where
1313: * root is mapped to nobody.
1314: */
1.225 dtucker 1315: if (original_effective_uid == 0) {
1316: PRIV_START;
1317: permanently_set_uid(pw);
1318: }
1.31 markus 1319:
1.33 markus 1320: /*
1321: * Now that we are back to our own permissions, create ~/.ssh
1.254 djm 1322: * directory if it doesn't already exist.
1.33 markus 1323: */
1.367 djm 1324: if (config == NULL) {
1325: r = snprintf(buf, sizeof buf, "%s%s%s", pw->pw_dir,
1326: strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR);
1327: if (r > 0 && (size_t)r < sizeof(buf) && stat(buf, &st) < 0)
1328: if (mkdir(buf, 0700) < 0)
1329: error("Could not create directory '%.200s'.",
1330: buf);
1331: }
1.31 markus 1332:
1.104 markus 1333: /* load options.identity_files */
1334: load_public_identity_files();
1.439 markus 1335:
1336: /* optionally set the SSH_AUTHSOCKET_ENV_NAME varibale */
1.440 markus 1337: if (options.identity_agent &&
1338: strcmp(options.identity_agent, SSH_AUTHSOCKET_ENV_NAME) != 0) {
1.439 markus 1339: if (strcmp(options.identity_agent, "none") == 0) {
1340: unsetenv(SSH_AUTHSOCKET_ENV_NAME);
1341: } else {
1342: p = tilde_expand_filename(options.identity_agent,
1343: original_real_uid);
1344: cp = percent_expand(p, "d", pw->pw_dir,
1345: "u", pw->pw_name, "l", thishost, "h", host,
1346: "r", options.user, (char *)NULL);
1347: setenv(SSH_AUTHSOCKET_ENV_NAME, cp, 1);
1348: free(cp);
1349: free(p);
1350: }
1351: }
1.104 markus 1352:
1353: /* Expand ~ in known host file names. */
1.361 djm 1354: tilde_expand_paths(options.system_hostfiles,
1355: options.num_system_hostfiles);
1356: tilde_expand_paths(options.user_hostfiles, options.num_user_hostfiles);
1.149 markus 1357:
1358: signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
1.352 djm 1359: signal(SIGCHLD, main_sigchld_handler);
1.31 markus 1360:
1.316 djm 1361: /* Log into the remote system. Never returns if the login fails. */
1.303 djm 1362: ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr,
1.355 djm 1363: options.port, pw, timeout_ms);
1.339 djm 1364:
1365: if (packet_connection_is_on_socket()) {
1366: verbose("Authenticated to %s ([%s]:%d).", host,
1.437 djm 1367: ssh_remote_ipaddr(ssh), ssh_remote_port(ssh));
1.339 djm 1368: } else {
1369: verbose("Authenticated to %s (via proxy).", host);
1370: }
1.31 markus 1371:
1.112 markus 1372: /* We no longer need the private host keys. Clear them now. */
1373: if (sensitive_data.nkeys != 0) {
1374: for (i = 0; i < sensitive_data.nkeys; i++) {
1375: if (sensitive_data.keys[i] != NULL) {
1376: /* Destroys contents safely */
1377: debug3("clear hostkey %d", i);
1378: key_free(sensitive_data.keys[i]);
1379: sensitive_data.keys[i] = NULL;
1380: }
1381: }
1.378 djm 1382: free(sensitive_data.keys);
1.134 markus 1383: }
1384: for (i = 0; i < options.num_identity_files; i++) {
1.378 djm 1385: free(options.identity_files[i]);
1386: options.identity_files[i] = NULL;
1.134 markus 1387: if (options.identity_keys[i]) {
1388: key_free(options.identity_keys[i]);
1389: options.identity_keys[i] = NULL;
1390: }
1.112 markus 1391: }
1.426 djm 1392: for (i = 0; i < options.num_certificate_files; i++) {
1393: free(options.certificate_files[i]);
1394: options.certificate_files[i] = NULL;
1395: }
1.31 markus 1396:
1.45 markus 1397: exit_status = compat20 ? ssh_session2() : ssh_session();
1398: packet_close();
1.186 djm 1399:
1.312 djm 1400: if (options.control_path != NULL && muxserver_sock != -1)
1.214 djm 1401: unlink(options.control_path);
1402:
1.353 djm 1403: /* Kill ProxyCommand if it is running. */
1404: ssh_kill_proxy_command();
1.186 djm 1405:
1.45 markus 1406: return exit_status;
1407: }
1408:
1.344 djm 1409: static void
1410: control_persist_detach(void)
1411: {
1412: pid_t pid;
1.438 djm 1413: int devnull, keep_stderr;
1.344 djm 1414:
1415: debug("%s: backgrounding master process", __func__);
1416:
1417: /*
1418: * master (current process) into the background, and make the
1419: * foreground process a client of the backgrounded master.
1420: */
1421: switch ((pid = fork())) {
1422: case -1:
1423: fatal("%s: fork: %s", __func__, strerror(errno));
1424: case 0:
1425: /* Child: master process continues mainloop */
1426: break;
1427: default:
1428: /* Parent: set up mux slave to connect to backgrounded master */
1429: debug2("%s: background process is %ld", __func__, (long)pid);
1430: stdin_null_flag = ostdin_null_flag;
1.359 djm 1431: options.request_tty = orequest_tty;
1.344 djm 1432: tty_flag = otty_flag;
1433: close(muxserver_sock);
1434: muxserver_sock = -1;
1.351 markus 1435: options.control_master = SSHCTL_MASTER_NO;
1.344 djm 1436: muxclient(options.control_path);
1437: /* muxclient() doesn't return on success. */
1438: fatal("Failed to connect to new control master");
1439: }
1.346 djm 1440: if ((devnull = open(_PATH_DEVNULL, O_RDWR)) == -1) {
1441: error("%s: open(\"/dev/null\"): %s", __func__,
1442: strerror(errno));
1443: } else {
1.438 djm 1444: keep_stderr = log_is_on_stderr() && debug_flag;
1.346 djm 1445: if (dup2(devnull, STDIN_FILENO) == -1 ||
1.438 djm 1446: dup2(devnull, STDOUT_FILENO) == -1 ||
1447: (!keep_stderr && dup2(devnull, STDERR_FILENO) == -1))
1.346 djm 1448: error("%s: dup2: %s", __func__, strerror(errno));
1449: if (devnull > STDERR_FILENO)
1450: close(devnull);
1451: }
1.381 djm 1452: daemon(1, 1);
1.362 djm 1453: setproctitle("%s [mux]", options.control_path);
1.344 djm 1454: }
1455:
1456: /* Do fork() after authentication. Used by "ssh -f" */
1457: static void
1458: fork_postauth(void)
1459: {
1460: if (need_controlpersist_detach)
1461: control_persist_detach();
1462: debug("forking to background");
1463: fork_after_authentication_flag = 0;
1464: if (daemon(1, 1) < 0)
1465: fatal("daemon() failed: %.200s", strerror(errno));
1466: }
1467:
1.315 djm 1468: /* Callback for remote forward global requests */
1469: static void
1470: ssh_confirm_remote_forward(int type, u_int32_t seq, void *ctxt)
1471: {
1.406 millert 1472: struct Forward *rfwd = (struct Forward *)ctxt;
1.315 djm 1473:
1.324 djm 1474: /* XXX verbose() on failure? */
1.404 markus 1475: debug("remote forward %s for: listen %s%s%d, connect %s:%d",
1.315 djm 1476: type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
1.406 millert 1477: rfwd->listen_path ? rfwd->listen_path :
1478: rfwd->listen_host ? rfwd->listen_host : "",
1479: (rfwd->listen_path || rfwd->listen_host) ? ":" : "",
1480: rfwd->listen_port, rfwd->connect_path ? rfwd->connect_path :
1481: rfwd->connect_host, rfwd->connect_port);
1482: if (rfwd->listen_path == NULL && rfwd->listen_port == 0) {
1.366 markus 1483: if (type == SSH2_MSG_REQUEST_SUCCESS) {
1484: rfwd->allocated_port = packet_get_int();
1485: logit("Allocated port %u for remote forward to %s:%d",
1486: rfwd->allocated_port,
1487: rfwd->connect_host, rfwd->connect_port);
1488: channel_update_permitted_opens(rfwd->handle,
1489: rfwd->allocated_port);
1490: } else {
1491: channel_update_permitted_opens(rfwd->handle, -1);
1492: }
1.324 djm 1493: }
1494:
1.315 djm 1495: if (type == SSH2_MSG_REQUEST_FAILURE) {
1.406 millert 1496: if (options.exit_on_forward_failure) {
1497: if (rfwd->listen_path != NULL)
1498: fatal("Error: remote port forwarding failed "
1499: "for listen path %s", rfwd->listen_path);
1500: else
1501: fatal("Error: remote port forwarding failed "
1502: "for listen port %d", rfwd->listen_port);
1503: } else {
1504: if (rfwd->listen_path != NULL)
1505: logit("Warning: remote port forwarding failed "
1506: "for listen path %s", rfwd->listen_path);
1507: else
1508: logit("Warning: remote port forwarding failed "
1509: "for listen port %d", rfwd->listen_port);
1510: }
1.315 djm 1511: }
1.318 djm 1512: if (++remote_forward_confirms_received == options.num_remote_forwards) {
1.315 djm 1513: debug("All remote forwarding requests processed");
1.344 djm 1514: if (fork_after_authentication_flag)
1515: fork_postauth();
1.318 djm 1516: }
1.315 djm 1517: }
1518:
1.126 itojun 1519: static void
1.331 dtucker 1520: client_cleanup_stdio_fwd(int id, void *arg)
1521: {
1522: debug("stdio forwarding: done");
1523: cleanup_exit(0);
1524: }
1525:
1.368 djm 1526: static void
1.407 djm 1527: ssh_stdio_confirm(int id, int success, void *arg)
1528: {
1529: if (!success)
1530: fatal("stdio forwarding failed");
1531: }
1532:
1533: static void
1.368 djm 1534: ssh_init_stdio_forwarding(void)
1.331 dtucker 1535: {
1536: Channel *c;
1.332 djm 1537: int in, out;
1.331 dtucker 1538:
1.441 dtucker 1539: if (options.stdio_forward_host == NULL)
1.368 djm 1540: return;
1.384 djm 1541: if (!compat20)
1.368 djm 1542: fatal("stdio forwarding require Protocol 2");
1543:
1.441 dtucker 1544: debug3("%s: %s:%d", __func__, options.stdio_forward_host,
1545: options.stdio_forward_port);
1.332 djm 1546:
1.368 djm 1547: if ((in = dup(STDIN_FILENO)) < 0 ||
1548: (out = dup(STDOUT_FILENO)) < 0)
1.332 djm 1549: fatal("channel_connect_stdio_fwd: dup() in/out failed");
1.441 dtucker 1550: if ((c = channel_connect_stdio_fwd(options.stdio_forward_host,
1551: options.stdio_forward_port, in, out)) == NULL)
1.368 djm 1552: fatal("%s: channel_connect_stdio_fwd failed", __func__);
1.331 dtucker 1553: channel_register_cleanup(c->self, client_cleanup_stdio_fwd, 0);
1.407 djm 1554: channel_register_open_confirm(c->self, ssh_stdio_confirm, NULL);
1.331 dtucker 1555: }
1556:
1557: static void
1.70 markus 1558: ssh_init_forwarding(void)
1559: {
1.86 markus 1560: int success = 0;
1.70 markus 1561: int i;
1.331 dtucker 1562:
1.70 markus 1563: /* Initiate local TCP/IP port forwardings. */
1564: for (i = 0; i < options.num_local_forwards; i++) {
1.232 djm 1565: debug("Local connections to %.200s:%d forwarded to remote "
1566: "address %.200s:%d",
1.406 millert 1567: (options.local_forwards[i].listen_path != NULL) ?
1568: options.local_forwards[i].listen_path :
1.234 deraadt 1569: (options.local_forwards[i].listen_host == NULL) ?
1.406 millert 1570: (options.fwd_opts.gateway_ports ? "*" : "LOCALHOST") :
1.232 djm 1571: options.local_forwards[i].listen_host,
1572: options.local_forwards[i].listen_port,
1.406 millert 1573: (options.local_forwards[i].connect_path != NULL) ?
1574: options.local_forwards[i].connect_path :
1.232 djm 1575: options.local_forwards[i].connect_host,
1576: options.local_forwards[i].connect_port);
1.158 markus 1577: success += channel_setup_local_fwd_listener(
1.406 millert 1578: &options.local_forwards[i], &options.fwd_opts);
1.70 markus 1579: }
1.283 markus 1580: if (i > 0 && success != i && options.exit_on_forward_failure)
1581: fatal("Could not request local forwarding.");
1.86 markus 1582: if (i > 0 && success == 0)
1583: error("Could not request local forwarding.");
1.70 markus 1584:
1585: /* Initiate remote TCP/IP port forwardings. */
1586: for (i = 0; i < options.num_remote_forwards; i++) {
1.232 djm 1587: debug("Remote connections from %.200s:%d forwarded to "
1588: "local address %.200s:%d",
1.406 millert 1589: (options.remote_forwards[i].listen_path != NULL) ?
1590: options.remote_forwards[i].listen_path :
1.248 djm 1591: (options.remote_forwards[i].listen_host == NULL) ?
1.253 djm 1592: "LOCALHOST" : options.remote_forwards[i].listen_host,
1.232 djm 1593: options.remote_forwards[i].listen_port,
1.406 millert 1594: (options.remote_forwards[i].connect_path != NULL) ?
1595: options.remote_forwards[i].connect_path :
1.232 djm 1596: options.remote_forwards[i].connect_host,
1597: options.remote_forwards[i].connect_port);
1.366 markus 1598: options.remote_forwards[i].handle =
1599: channel_request_remote_forwarding(
1.406 millert 1600: &options.remote_forwards[i]);
1.366 markus 1601: if (options.remote_forwards[i].handle < 0) {
1.283 markus 1602: if (options.exit_on_forward_failure)
1603: fatal("Could not request remote forwarding.");
1604: else
1605: logit("Warning: Could not request remote "
1606: "forwarding.");
1.366 markus 1607: } else {
1608: client_register_global_confirm(ssh_confirm_remote_forward,
1609: &options.remote_forwards[i]);
1.283 markus 1610: }
1.70 markus 1611: }
1.301 djm 1612:
1613: /* Initiate tunnel forwarding. */
1614: if (options.tun_open != SSH_TUNMODE_NO) {
1615: if (client_request_tun_fwd(options.tun_open,
1616: options.tun_local, options.tun_remote) == -1) {
1617: if (options.exit_on_forward_failure)
1618: fatal("Could not request tunnel forwarding.");
1619: else
1620: error("Could not request tunnel forwarding.");
1621: }
1622: }
1.70 markus 1623: }
1624:
1.126 itojun 1625: static void
1.70 markus 1626: check_agent_present(void)
1627: {
1.412 djm 1628: int r;
1629:
1.70 markus 1630: if (options.forward_agent) {
1.254 djm 1631: /* Clear agent forwarding if we don't have an agent. */
1.412 djm 1632: if ((r = ssh_get_authentication_socket(NULL)) != 0) {
1.70 markus 1633: options.forward_agent = 0;
1.412 djm 1634: if (r != SSH_ERR_AGENT_NOT_PRESENT)
1635: debug("ssh_get_authentication_socket: %s",
1636: ssh_err(r));
1637: }
1.70 markus 1638: }
1639: }
1640:
1.126 itojun 1641: static int
1.45 markus 1642: ssh_session(void)
1643: {
1644: int type;
1645: int interactive = 0;
1646: int have_tty = 0;
1647: struct winsize ws;
1648: char *cp;
1.243 djm 1649: const char *display;
1.433 djm 1650: char *proto = NULL, *data = NULL;
1.45 markus 1651:
1.31 markus 1652: /* Enable compression if requested. */
1653: if (options.compression) {
1.316 djm 1654: debug("Requesting compression at level %d.",
1655: options.compression_level);
1.31 markus 1656:
1.316 djm 1657: if (options.compression_level < 1 ||
1658: options.compression_level > 9)
1659: fatal("Compression level must be from 1 (fast) to "
1660: "9 (slow, best).");
1.31 markus 1661:
1662: /* Send the request. */
1663: packet_start(SSH_CMSG_REQUEST_COMPRESSION);
1664: packet_put_int(options.compression_level);
1665: packet_send();
1666: packet_write_wait();
1.156 markus 1667: type = packet_read();
1.31 markus 1668: if (type == SSH_SMSG_SUCCESS)
1669: packet_start_compression(options.compression_level);
1670: else if (type == SSH_SMSG_FAILURE)
1.191 itojun 1671: logit("Warning: Remote host refused compression.");
1.31 markus 1672: else
1.316 djm 1673: packet_disconnect("Protocol error waiting for "
1674: "compression response.");
1.31 markus 1675: }
1676: /* Allocate a pseudo tty if appropriate. */
1677: if (tty_flag) {
1678: debug("Requesting pty.");
1679:
1680: /* Start the packet. */
1681: packet_start(SSH_CMSG_REQUEST_PTY);
1682:
1683: /* Store TERM in the packet. There is no limit on the
1684: length of the string. */
1685: cp = getenv("TERM");
1686: if (!cp)
1687: cp = "";
1.124 markus 1688: packet_put_cstring(cp);
1.31 markus 1689:
1690: /* Store window size in the packet. */
1691: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
1692: memset(&ws, 0, sizeof(ws));
1.269 deraadt 1693: packet_put_int((u_int)ws.ws_row);
1694: packet_put_int((u_int)ws.ws_col);
1695: packet_put_int((u_int)ws.ws_xpixel);
1696: packet_put_int((u_int)ws.ws_ypixel);
1.31 markus 1697:
1698: /* Store tty modes in the packet. */
1.115 stevesk 1699: tty_make_modes(fileno(stdin), NULL);
1.31 markus 1700:
1701: /* Send the packet, and wait for it to leave. */
1702: packet_send();
1703: packet_write_wait();
1704:
1705: /* Read response from the server. */
1.156 markus 1706: type = packet_read();
1.43 markus 1707: if (type == SSH_SMSG_SUCCESS) {
1.31 markus 1708: interactive = 1;
1.45 markus 1709: have_tty = 1;
1.43 markus 1710: } else if (type == SSH_SMSG_FAILURE)
1.316 djm 1711: logit("Warning: Remote host failed or refused to "
1712: "allocate a pseudo tty.");
1.31 markus 1713: else
1.316 djm 1714: packet_disconnect("Protocol error waiting for pty "
1715: "request response.");
1.31 markus 1716: }
1717: /* Request X11 forwarding if enabled and DISPLAY is set. */
1.243 djm 1718: display = getenv("DISPLAY");
1.417 djm 1719: if (display == NULL && options.forward_x11)
1720: debug("X11 forwarding requested but DISPLAY not set");
1.433 djm 1721: if (options.forward_x11 && client_x11_get_proto(display,
1722: options.xauth_location, options.forward_x11_trusted,
1723: options.forward_x11_timeout, &proto, &data) == 0) {
1.50 markus 1724: /* Request forwarding with authentication spoofing. */
1.316 djm 1725: debug("Requesting X11 forwarding with authentication "
1726: "spoofing.");
1.363 djm 1727: x11_request_forwarding_with_spoofing(0, display, proto,
1728: data, 0);
1.31 markus 1729: /* Read response from the server. */
1.156 markus 1730: type = packet_read();
1.31 markus 1731: if (type == SSH_SMSG_SUCCESS) {
1732: interactive = 1;
1.50 markus 1733: } else if (type == SSH_SMSG_FAILURE) {
1.191 itojun 1734: logit("Warning: Remote host denied X11 forwarding.");
1.50 markus 1735: } else {
1.316 djm 1736: packet_disconnect("Protocol error waiting for X11 "
1737: "forwarding");
1.50 markus 1738: }
1.31 markus 1739: }
1740: /* Tell the packet module whether this is an interactive session. */
1.354 djm 1741: packet_set_interactive(interactive,
1742: options.ip_qos_interactive, options.ip_qos_bulk);
1.31 markus 1743:
1744: /* Request authentication agent forwarding if appropriate. */
1.70 markus 1745: check_agent_present();
1746:
1.31 markus 1747: if (options.forward_agent) {
1748: debug("Requesting authentication agent forwarding.");
1749: auth_request_forwarding();
1750:
1751: /* Read response from the server. */
1.156 markus 1752: type = packet_read();
1.155 markus 1753: packet_check_eom();
1.31 markus 1754: if (type != SSH_SMSG_SUCCESS)
1.191 itojun 1755: logit("Warning: Remote host denied authentication agent forwarding.");
1.31 markus 1756: }
1757:
1.70 markus 1758: /* Initiate port forwardings. */
1.368 djm 1759: ssh_init_stdio_forwarding();
1.70 markus 1760: ssh_init_forwarding();
1.305 dtucker 1761:
1762: /* Execute a local command */
1763: if (options.local_command != NULL &&
1764: options.permit_local_command)
1765: ssh_local_cmd(options.local_command);
1.34 markus 1766:
1.318 djm 1767: /*
1768: * If requested and we are not interested in replies to remote
1769: * forwarding requests, then let ssh continue in the background.
1770: */
1.344 djm 1771: if (fork_after_authentication_flag) {
1772: if (options.exit_on_forward_failure &&
1773: options.num_remote_forwards > 0) {
1774: debug("deferring postauth fork until remote forward "
1775: "confirmation received");
1776: } else
1777: fork_postauth();
1.318 djm 1778: }
1.31 markus 1779:
1.33 markus 1780: /*
1781: * If a command was specified on the command line, execute the
1782: * command now. Otherwise request the server to start a shell.
1783: */
1.31 markus 1784: if (buffer_len(&command) > 0) {
1785: int len = buffer_len(&command);
1786: if (len > 900)
1787: len = 900;
1.316 djm 1788: debug("Sending command: %.*s", len,
1789: (u_char *)buffer_ptr(&command));
1.31 markus 1790: packet_start(SSH_CMSG_EXEC_CMD);
1791: packet_put_string(buffer_ptr(&command), buffer_len(&command));
1792: packet_send();
1793: packet_write_wait();
1794: } else {
1795: debug("Requesting shell.");
1796: packet_start(SSH_CMSG_EXEC_SHELL);
1797: packet_send();
1798: packet_write_wait();
1799: }
1800:
1801: /* Enter the interactive session. */
1.119 stevesk 1802: return client_loop(have_tty, tty_flag ?
1803: options.escape_char : SSH_ESCAPECHAR_NONE, 0);
1.89 markus 1804: }
1805:
1.214 djm 1806: /* request pty/x11/agent/tcpfwd/shell for channel */
1807: static void
1.337 djm 1808: ssh_session2_setup(int id, int success, void *arg)
1.214 djm 1809: {
1.215 djm 1810: extern char **environ;
1.243 djm 1811: const char *display;
1812: int interactive = tty_flag;
1.433 djm 1813: char *proto = NULL, *data = NULL;
1.337 djm 1814:
1815: if (!success)
1816: return; /* No need for error message, channels code sens one */
1.215 djm 1817:
1.248 djm 1818: display = getenv("DISPLAY");
1.417 djm 1819: if (display == NULL && options.forward_x11)
1820: debug("X11 forwarding requested but DISPLAY not set");
1.433 djm 1821: if (options.forward_x11 && client_x11_get_proto(display,
1822: options.xauth_location, options.forward_x11_trusted,
1823: options.forward_x11_timeout, &proto, &data) == 0) {
1.50 markus 1824: /* Request forwarding with authentication spoofing. */
1.316 djm 1825: debug("Requesting X11 forwarding with authentication "
1826: "spoofing.");
1.363 djm 1827: x11_request_forwarding_with_spoofing(id, display, proto,
1828: data, 1);
1829: client_expect_confirm(id, "X11 forwarding", CONFIRM_WARN);
1830: /* XXX exit_on_forward_failure */
1.80 markus 1831: interactive = 1;
1.50 markus 1832: }
1833:
1.70 markus 1834: check_agent_present();
1835: if (options.forward_agent) {
1836: debug("Requesting authentication agent forwarding.");
1837: channel_request_start(id, "auth-agent-req@openssh.com", 0);
1838: packet_send();
1.212 djm 1839: }
1.369 dtucker 1840:
1841: /* Tell the packet module whether this is an interactive session. */
1842: packet_set_interactive(interactive,
1843: options.ip_qos_interactive, options.ip_qos_bulk);
1.212 djm 1844:
1.214 djm 1845: client_session2_setup(id, tty_flag, subsystem_flag, getenv("TERM"),
1.311 djm 1846: NULL, fileno(stdin), &command, environ);
1.45 markus 1847: }
1848:
1.143 markus 1849: /* open new channel for a session */
1.126 itojun 1850: static int
1.143 markus 1851: ssh_session2_open(void)
1.45 markus 1852: {
1.118 markus 1853: Channel *c;
1854: int window, packetmax, in, out, err;
1.60 markus 1855:
1.62 markus 1856: if (stdin_null_flag) {
1.93 itojun 1857: in = open(_PATH_DEVNULL, O_RDONLY);
1.62 markus 1858: } else {
1859: in = dup(STDIN_FILENO);
1860: }
1.60 markus 1861: out = dup(STDOUT_FILENO);
1862: err = dup(STDERR_FILENO);
1.45 markus 1863:
1864: if (in < 0 || out < 0 || err < 0)
1.62 markus 1865: fatal("dup() in/out/err failed");
1.45 markus 1866:
1.69 markus 1867: /* enable nonblocking unless tty */
1868: if (!isatty(in))
1869: set_nonblock(in);
1870: if (!isatty(out))
1871: set_nonblock(out);
1872: if (!isatty(err))
1873: set_nonblock(err);
1874:
1.65 markus 1875: window = CHAN_SES_WINDOW_DEFAULT;
1876: packetmax = CHAN_SES_PACKET_DEFAULT;
1.164 markus 1877: if (tty_flag) {
1878: window >>= 1;
1879: packetmax >>= 1;
1.45 markus 1880: }
1.118 markus 1881: c = channel_new(
1.45 markus 1882: "session", SSH_CHANNEL_OPENING, in, out, err,
1.65 markus 1883: window, packetmax, CHAN_EXTENDED_WRITE,
1.192 markus 1884: "client-session", /*nonblock*/0);
1.45 markus 1885:
1.143 markus 1886: debug3("ssh_session2_open: channel_new: %d", c->self);
1.106 markus 1887:
1.122 markus 1888: channel_send_open(c->self);
1.143 markus 1889: if (!no_shell_flag)
1.310 djm 1890: channel_register_open_confirm(c->self,
1891: ssh_session2_setup, NULL);
1.106 markus 1892:
1.118 markus 1893: return c->self;
1.106 markus 1894: }
1895:
1.126 itojun 1896: static int
1.106 markus 1897: ssh_session2(void)
1898: {
1.143 markus 1899: int id = -1;
1.106 markus 1900:
1901: /* XXX should be pre-session */
1.368 djm 1902: if (!options.control_persist)
1903: ssh_init_stdio_forwarding();
1.106 markus 1904: ssh_init_forwarding();
1905:
1.344 djm 1906: /* Start listening for multiplex clients */
1907: muxserver_listen();
1908:
1909: /*
1.368 djm 1910: * If we are in control persist mode and have a working mux listen
1911: * socket, then prepare to background ourselves and have a foreground
1912: * client attach as a control slave.
1913: * NB. we must save copies of the flags that we override for
1.344 djm 1914: * the backgrounding, since we defer attachment of the slave until
1915: * after the connection is fully established (in particular,
1916: * async rfwd replies have been received for ExitOnForwardFailure).
1917: */
1918: if (options.control_persist && muxserver_sock != -1) {
1919: ostdin_null_flag = stdin_null_flag;
1920: ono_shell_flag = no_shell_flag;
1.359 djm 1921: orequest_tty = options.request_tty;
1.344 djm 1922: otty_flag = tty_flag;
1923: stdin_null_flag = 1;
1924: no_shell_flag = 1;
1925: tty_flag = 0;
1926: if (!fork_after_authentication_flag)
1927: need_controlpersist_detach = 1;
1928: fork_after_authentication_flag = 1;
1929: }
1.368 djm 1930: /*
1931: * ControlPersist mux listen socket setup failed, attempt the
1932: * stdio forward setup that we skipped earlier.
1933: */
1934: if (options.control_persist && muxserver_sock == -1)
1935: ssh_init_stdio_forwarding();
1.344 djm 1936:
1.143 markus 1937: if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN))
1938: id = ssh_session2_open();
1.379 djm 1939: else {
1940: packet_set_interactive(
1941: options.control_master == SSHCTL_MASTER_NO,
1942: options.ip_qos_interactive, options.ip_qos_bulk);
1943: }
1.314 djm 1944:
1945: /* If we don't expect to open a new session, then disallow it */
1.319 markus 1946: if (options.control_master == SSHCTL_MASTER_NO &&
1947: (datafellows & SSH_NEW_OPENSSH)) {
1.314 djm 1948: debug("Requesting no-more-sessions@openssh.com");
1949: packet_start(SSH2_MSG_GLOBAL_REQUEST);
1950: packet_put_cstring("no-more-sessions@openssh.com");
1951: packet_put_char(0);
1952: packet_send();
1953: }
1.255 reyk 1954:
1955: /* Execute a local command */
1956: if (options.local_command != NULL &&
1957: options.permit_local_command)
1958: ssh_local_cmd(options.local_command);
1.301 djm 1959:
1.342 djm 1960: /*
1961: * If requested and we are not interested in replies to remote
1962: * forwarding requests, then let ssh continue in the background.
1963: */
1.344 djm 1964: if (fork_after_authentication_flag) {
1965: if (options.exit_on_forward_failure &&
1966: options.num_remote_forwards > 0) {
1967: debug("deferring postauth fork until remote forward "
1968: "confirmation received");
1969: } else
1970: fork_postauth();
1.318 djm 1971: }
1.31 markus 1972:
1.119 stevesk 1973: return client_loop(tty_flag, tty_flag ?
1974: options.escape_char : SSH_ESCAPECHAR_NONE, id);
1.72 markus 1975: }
1976:
1.426 djm 1977: /* Loads all IdentityFile and CertificateFile keys */
1.126 itojun 1978: static void
1.104 markus 1979: load_public_identity_files(void)
1980: {
1.275 djm 1981: char *filename, *cp, thishost[NI_MAXHOST];
1.306 deraadt 1982: char *pwdir = NULL, *pwname = NULL;
1.104 markus 1983: Key *public;
1.275 djm 1984: struct passwd *pw;
1.426 djm 1985: int i;
1986: u_int n_ids, n_certs;
1.335 djm 1987: char *identity_files[SSH_MAX_IDENTITY_FILES];
1988: Key *identity_keys[SSH_MAX_IDENTITY_FILES];
1.426 djm 1989: char *certificate_files[SSH_MAX_CERTIFICATE_FILES];
1990: struct sshkey *certificates[SSH_MAX_CERTIFICATE_FILES];
1.333 markus 1991: #ifdef ENABLE_PKCS11
1.167 markus 1992: Key **keys;
1.333 markus 1993: int nkeys;
1.335 djm 1994: #endif /* PKCS11 */
1.104 markus 1995:
1.426 djm 1996: n_ids = n_certs = 0;
1.398 tedu 1997: memset(identity_files, 0, sizeof(identity_files));
1998: memset(identity_keys, 0, sizeof(identity_keys));
1.426 djm 1999: memset(certificate_files, 0, sizeof(certificate_files));
2000: memset(certificates, 0, sizeof(certificates));
1.335 djm 2001:
2002: #ifdef ENABLE_PKCS11
1.333 markus 2003: if (options.pkcs11_provider != NULL &&
1.167 markus 2004: options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
1.333 markus 2005: (pkcs11_init(!options.batch_mode) == 0) &&
2006: (nkeys = pkcs11_add_provider(options.pkcs11_provider, NULL,
2007: &keys)) > 0) {
2008: for (i = 0; i < nkeys; i++) {
1.335 djm 2009: if (n_ids >= SSH_MAX_IDENTITY_FILES) {
2010: key_free(keys[i]);
2011: continue;
2012: }
2013: identity_keys[n_ids] = keys[i];
2014: identity_files[n_ids] =
1.333 markus 2015: xstrdup(options.pkcs11_provider); /* XXX */
1.335 djm 2016: n_ids++;
1.167 markus 2017: }
1.378 djm 2018: free(keys);
1.127 markus 2019: }
1.333 markus 2020: #endif /* ENABLE_PKCS11 */
1.275 djm 2021: if ((pw = getpwuid(original_real_uid)) == NULL)
2022: fatal("load_public_identity_files: getpwuid failed");
1.307 dtucker 2023: pwname = xstrdup(pw->pw_name);
2024: pwdir = xstrdup(pw->pw_dir);
1.275 djm 2025: if (gethostname(thishost, sizeof(thishost)) == -1)
2026: fatal("load_public_identity_files: gethostname: %s",
2027: strerror(errno));
1.335 djm 2028: for (i = 0; i < options.num_identity_files; i++) {
1.373 djm 2029: if (n_ids >= SSH_MAX_IDENTITY_FILES ||
2030: strcasecmp(options.identity_files[i], "none") == 0) {
1.378 djm 2031: free(options.identity_files[i]);
1.426 djm 2032: options.identity_files[i] = NULL;
1.335 djm 2033: continue;
2034: }
1.275 djm 2035: cp = tilde_expand_filename(options.identity_files[i],
1.131 millert 2036: original_real_uid);
1.306 deraadt 2037: filename = percent_expand(cp, "d", pwdir,
2038: "u", pwname, "l", thishost, "h", host,
1.275 djm 2039: "r", options.user, (char *)NULL);
1.378 djm 2040: free(cp);
1.131 millert 2041: public = key_load_public(filename, NULL);
2042: debug("identity file %s type %d", filename,
2043: public ? public->type : -1);
1.378 djm 2044: free(options.identity_files[i]);
1.335 djm 2045: identity_files[n_ids] = filename;
2046: identity_keys[n_ids] = public;
2047:
2048: if (++n_ids >= SSH_MAX_IDENTITY_FILES)
2049: continue;
2050:
1.426 djm 2051: /*
2052: * If no certificates have been explicitly listed then try
2053: * to add the default certificate variant too.
2054: */
2055: if (options.num_certificate_files != 0)
2056: continue;
1.335 djm 2057: xasprintf(&cp, "%s-cert", filename);
2058: public = key_load_public(cp, NULL);
2059: debug("identity file %s type %d", cp,
2060: public ? public->type : -1);
2061: if (public == NULL) {
1.378 djm 2062: free(cp);
1.335 djm 2063: continue;
2064: }
2065: if (!key_is_cert(public)) {
2066: debug("%s: key %s type %s is not a certificate",
2067: __func__, cp, key_type(public));
2068: key_free(public);
1.378 djm 2069: free(cp);
1.335 djm 2070: continue;
2071: }
2072: identity_keys[n_ids] = public;
1.426 djm 2073: identity_files[n_ids] = cp;
1.335 djm 2074: n_ids++;
2075: }
1.426 djm 2076:
2077: if (options.num_certificate_files > SSH_MAX_CERTIFICATE_FILES)
2078: fatal("%s: too many certificates", __func__);
2079: for (i = 0; i < options.num_certificate_files; i++) {
2080: cp = tilde_expand_filename(options.certificate_files[i],
2081: original_real_uid);
2082: filename = percent_expand(cp, "d", pwdir,
2083: "u", pwname, "l", thishost, "h", host,
2084: "r", options.user, (char *)NULL);
2085: free(cp);
2086:
2087: public = key_load_public(filename, NULL);
2088: debug("certificate file %s type %d", filename,
2089: public ? public->type : -1);
2090: free(options.certificate_files[i]);
2091: options.certificate_files[i] = NULL;
2092: if (public == NULL) {
2093: free(filename);
2094: continue;
2095: }
2096: if (!key_is_cert(public)) {
2097: debug("%s: key %s type %s is not a certificate",
2098: __func__, filename, key_type(public));
2099: key_free(public);
2100: free(filename);
2101: continue;
2102: }
2103: certificate_files[n_certs] = filename;
2104: certificates[n_certs] = public;
2105: ++n_certs;
2106: }
2107:
1.335 djm 2108: options.num_identity_files = n_ids;
2109: memcpy(options.identity_files, identity_files, sizeof(identity_files));
2110: memcpy(options.identity_keys, identity_keys, sizeof(identity_keys));
1.426 djm 2111:
2112: options.num_certificate_files = n_certs;
2113: memcpy(options.certificate_files,
2114: certificate_files, sizeof(certificate_files));
2115: memcpy(options.certificates, certificates, sizeof(certificates));
1.335 djm 2116:
1.398 tedu 2117: explicit_bzero(pwname, strlen(pwname));
1.378 djm 2118: free(pwname);
1.398 tedu 2119: explicit_bzero(pwdir, strlen(pwdir));
1.378 djm 2120: free(pwdir);
1.214 djm 2121: }
1.352 djm 2122:
2123: static void
2124: main_sigchld_handler(int sig)
2125: {
2126: int save_errno = errno;
2127: pid_t pid;
2128: int status;
2129:
2130: while ((pid = waitpid(-1, &status, WNOHANG)) > 0 ||
2131: (pid < 0 && errno == EINTR))
2132: ;
2133:
2134: signal(sig, main_sigchld_handler);
2135: errno = save_errno;
2136: }
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