Annotation of src/usr.bin/ssh/ssh.c, Revision 1.419
1.419 ! millert 1: /* $OpenBSD: ssh.c,v 1.418 2015/05/04 06:10:48 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>
1.49 markus 65:
1.402 markus 66: #ifdef WITH_OPENSSL
1.49 markus 67: #include <openssl/evp.h>
1.72 markus 68: #include <openssl/err.h>
1.402 markus 69: #endif
1.1 deraadt 70:
1.293 deraadt 71: #include "xmalloc.h"
1.84 markus 72: #include "ssh.h"
73: #include "ssh1.h"
74: #include "ssh2.h"
1.341 djm 75: #include "canohost.h"
1.84 markus 76: #include "compat.h"
77: #include "cipher.h"
1.405 djm 78: #include "digest.h"
1.1 deraadt 79: #include "packet.h"
80: #include "buffer.h"
1.123 markus 81: #include "channels.h"
1.49 markus 82: #include "key.h"
1.58 markus 83: #include "authfd.h"
1.49 markus 84: #include "authfile.h"
1.83 markus 85: #include "pathnames.h"
1.214 djm 86: #include "dispatch.h"
1.81 markus 87: #include "clientloop.h"
1.84 markus 88: #include "log.h"
1.406 millert 89: #include "misc.h"
1.84 markus 90: #include "readconf.h"
91: #include "sshconnect.h"
1.95 markus 92: #include "kex.h"
93: #include "mac.h"
1.213 deraadt 94: #include "sshpty.h"
1.212 djm 95: #include "match.h"
1.214 djm 96: #include "msg.h"
1.225 dtucker 97: #include "uidswap.h"
1.327 andreas 98: #include "roaming.h"
1.278 stevesk 99: #include "version.h"
1.412 djm 100: #include "ssherr.h"
1.49 markus 101:
1.333 markus 102: #ifdef ENABLE_PKCS11
103: #include "ssh-pkcs11.h"
1.137 jakob 104: #endif
1.127 markus 105:
1.49 markus 106: extern char *__progname;
1.1 deraadt 107:
1.316 djm 108: /* Flag indicating whether debug mode is on. May be set on the command line. */
1.1 deraadt 109: int debug_flag = 0;
110:
1.359 djm 111: /* Flag indicating whether a tty should be requested */
1.1 deraadt 112: int tty_flag = 0;
113:
1.45 markus 114: /* don't exec a shell */
115: int no_shell_flag = 0;
116:
1.33 markus 117: /*
118: * Flag indicating that nothing should be read from stdin. This can be set
119: * on the command line.
120: */
1.1 deraadt 121: int stdin_null_flag = 0;
122:
1.33 markus 123: /*
1.344 djm 124: * Flag indicating that the current process should be backgrounded and
125: * a new slave launched in the foreground for ControlPersist.
126: */
127: int need_controlpersist_detach = 0;
128:
129: /* Copies of flags for ControlPersist foreground slave */
1.359 djm 130: int ostdin_null_flag, ono_shell_flag, otty_flag, orequest_tty;
1.344 djm 131:
132: /*
1.33 markus 133: * Flag indicating that ssh should fork after authentication. This is useful
1.172 deraadt 134: * so that the passphrase can be entered manually, and then ssh goes to the
1.33 markus 135: * background.
136: */
1.1 deraadt 137: int fork_after_authentication_flag = 0;
138:
1.331 dtucker 139: /* forward stdio to remote host and port */
140: char *stdio_forward_host = NULL;
141: int stdio_forward_port = 0;
142:
1.33 markus 143: /*
144: * General data structure for command line options and options configurable
145: * in configuration files. See readconf.h.
146: */
1.1 deraadt 147: Options options;
148:
1.139 markus 149: /* optional user configfile */
150: char *config = NULL;
151:
1.33 markus 152: /*
153: * Name of the host we are connecting to. This is the name given on the
154: * command line, or the HostName specified for the user-supplied name in a
155: * configuration file.
156: */
1.1 deraadt 157: char *host;
158:
1.22 provos 159: /* socket address the host resolves to */
1.37 markus 160: struct sockaddr_storage hostaddr;
1.1 deraadt 161:
1.112 markus 162: /* Private host keys. */
1.173 markus 163: Sensitive sensitive_data;
1.1 deraadt 164:
1.10 dugsong 165: /* Original real UID. */
166: uid_t original_real_uid;
1.177 markus 167: uid_t original_effective_uid;
1.1 deraadt 168:
1.45 markus 169: /* command to be executed */
170: Buffer command;
171:
1.85 djm 172: /* Should we execute a command or invoke a subsystem? */
173: int subsystem_flag = 0;
174:
1.170 markus 175: /* # of replies received for global requests */
1.315 djm 176: static int remote_forward_confirms_received = 0;
1.170 markus 177:
1.313 djm 178: /* mux.c */
179: extern int muxserver_sock;
180: extern u_int muxclient_command;
181:
1.1 deraadt 182: /* Prints a help message to the user. This function never returns. */
183:
1.126 itojun 184: static void
1.93 itojun 185: usage(void)
1.1 deraadt 186: {
1.208 markus 187: fprintf(stderr,
1.409 jmc 188: "usage: ssh [-1246AaCfGgKkMNnqsTtVvXxYy] [-b bind_address] [-c cipher_spec]\n"
1.375 dtucker 189: " [-D [bind_address:]port] [-E log_file] [-e escape_char]\n"
190: " [-F configfile] [-I pkcs11] [-i identity_file]\n"
1.419 ! millert 191: " [-L address] [-l login_name] [-m mac_spec]\n"
1.395 jmc 192: " [-O ctl_cmd] [-o option] [-p port]\n"
193: " [-Q cipher | cipher-auth | mac | kex | key]\n"
1.419 ! millert 194: " [-R address] [-S ctl_path] [-W host:port]\n"
1.395 jmc 195: " [-w local_tun[:remote_tun]] [user@]hostname [command]\n"
1.208 markus 196: );
1.257 dtucker 197: exit(255);
1.1 deraadt 198: }
199:
1.126 itojun 200: static int ssh_session(void);
201: static int ssh_session2(void);
202: static void load_public_identity_files(void);
1.352 djm 203: static void main_sigchld_handler(int);
1.312 djm 204:
205: /* from muxclient.c */
206: void muxclient(const char *);
207: void muxserver_listen(void);
1.45 markus 208:
1.361 djm 209: /* ~/ expand a list of paths. NB. assumes path[n] is heap-allocated. */
210: static void
211: tilde_expand_paths(char **paths, u_int num_paths)
212: {
213: u_int i;
214: char *cp;
215:
216: for (i = 0; i < num_paths; i++) {
217: cp = tilde_expand_filename(paths[i], original_real_uid);
1.378 djm 218: free(paths[i]);
1.361 djm 219: paths[i] = cp;
220: }
221: }
222:
1.400 djm 223: /*
224: * Attempt to resolve a host name / port to a set of addresses and
225: * optionally return any CNAMEs encountered along the way.
226: * Returns NULL on failure.
227: * NB. this function must operate with a options having undefined members.
228: */
1.385 djm 229: static struct addrinfo *
1.400 djm 230: resolve_host(const char *name, int port, int logerr, char *cname, size_t clen)
1.385 djm 231: {
232: char strport[NI_MAXSERV];
233: struct addrinfo hints, *res;
234: int gaierr, loglevel = SYSLOG_LEVEL_DEBUG1;
235:
1.400 djm 236: if (port <= 0)
237: port = default_ssh_port();
238:
1.385 djm 239: snprintf(strport, sizeof strport, "%u", port);
1.398 tedu 240: memset(&hints, 0, sizeof(hints));
1.400 djm 241: hints.ai_family = options.address_family == -1 ?
242: AF_UNSPEC : options.address_family;
1.385 djm 243: hints.ai_socktype = SOCK_STREAM;
244: if (cname != NULL)
245: hints.ai_flags = AI_CANONNAME;
246: if ((gaierr = getaddrinfo(name, strport, &hints, &res)) != 0) {
247: if (logerr || (gaierr != EAI_NONAME && gaierr != EAI_NODATA))
248: loglevel = SYSLOG_LEVEL_ERROR;
249: do_log2(loglevel, "%s: Could not resolve hostname %.100s: %s",
250: __progname, name, ssh_gai_strerror(gaierr));
251: return NULL;
252: }
253: if (cname != NULL && res->ai_canonname != NULL) {
254: if (strlcpy(cname, res->ai_canonname, clen) >= clen) {
255: error("%s: host \"%s\" cname \"%s\" too long (max %lu)",
256: __func__, name, res->ai_canonname, (u_long)clen);
257: if (clen > 0)
258: *cname = '\0';
259: }
260: }
261: return res;
262: }
263:
264: /*
1.413 djm 265: * Attempt to resolve a numeric host address / port to a single address.
266: * Returns a canonical address string.
267: * Returns NULL on failure.
268: * NB. this function must operate with a options having undefined members.
269: */
270: static struct addrinfo *
271: resolve_addr(const char *name, int port, char *caddr, size_t clen)
272: {
273: char addr[NI_MAXHOST], strport[NI_MAXSERV];
274: struct addrinfo hints, *res;
275: int gaierr;
276:
277: if (port <= 0)
278: port = default_ssh_port();
279: snprintf(strport, sizeof strport, "%u", port);
280: memset(&hints, 0, sizeof(hints));
281: hints.ai_family = options.address_family == -1 ?
282: AF_UNSPEC : options.address_family;
283: hints.ai_socktype = SOCK_STREAM;
284: hints.ai_flags = AI_NUMERICHOST|AI_NUMERICSERV;
285: if ((gaierr = getaddrinfo(name, strport, &hints, &res)) != 0) {
286: debug2("%s: could not resolve name %.100s as address: %s",
287: __func__, name, ssh_gai_strerror(gaierr));
288: return NULL;
289: }
290: if (res == NULL) {
291: debug("%s: getaddrinfo %.100s returned no addresses",
292: __func__, name);
293: return NULL;
294: }
295: if (res->ai_next != NULL) {
296: debug("%s: getaddrinfo %.100s returned multiple addresses",
297: __func__, name);
298: goto fail;
299: }
300: if ((gaierr = getnameinfo(res->ai_addr, res->ai_addrlen,
301: addr, sizeof(addr), NULL, 0, NI_NUMERICHOST)) != 0) {
302: debug("%s: Could not format address for name %.100s: %s",
303: __func__, name, ssh_gai_strerror(gaierr));
304: goto fail;
305: }
306: if (strlcpy(caddr, addr, clen) >= clen) {
307: error("%s: host \"%s\" addr \"%s\" too long (max %lu)",
308: __func__, name, addr, (u_long)clen);
309: if (clen > 0)
310: *caddr = '\0';
311: fail:
312: freeaddrinfo(res);
313: return NULL;
314: }
315: return res;
316: }
317:
318: /*
1.385 djm 319: * Check whether the cname is a permitted replacement for the hostname
320: * and perform the replacement if it is.
1.400 djm 321: * NB. this function must operate with a options having undefined members.
1.385 djm 322: */
323: static int
324: check_follow_cname(char **namep, const char *cname)
325: {
326: int i;
327: struct allowed_cname *rule;
328:
329: if (*cname == '\0' || options.num_permitted_cnames == 0 ||
330: strcmp(*namep, cname) == 0)
331: return 0;
1.386 djm 332: if (options.canonicalize_hostname == SSH_CANONICALISE_NO)
1.385 djm 333: return 0;
334: /*
1.386 djm 335: * Don't attempt to canonicalize names that will be interpreted by
1.385 djm 336: * a proxy unless the user specifically requests so.
337: */
1.400 djm 338: if (!option_clear_or_none(options.proxy_command) &&
1.386 djm 339: options.canonicalize_hostname != SSH_CANONICALISE_ALWAYS)
1.385 djm 340: return 0;
341: debug3("%s: check \"%s\" CNAME \"%s\"", __func__, *namep, cname);
342: for (i = 0; i < options.num_permitted_cnames; i++) {
343: rule = options.permitted_cnames + i;
1.418 djm 344: if (match_pattern_list(*namep, rule->source_list, 1) != 1 ||
345: match_pattern_list(cname, rule->target_list, 1) != 1)
1.385 djm 346: continue;
1.386 djm 347: verbose("Canonicalized DNS aliased hostname "
1.385 djm 348: "\"%s\" => \"%s\"", *namep, cname);
349: free(*namep);
350: *namep = xstrdup(cname);
351: return 1;
352: }
353: return 0;
354: }
355:
356: /*
357: * Attempt to resolve the supplied hostname after applying the user's
1.387 djm 358: * canonicalization rules. Returns the address list for the host or NULL
359: * if no name was found after canonicalization.
1.400 djm 360: * NB. this function must operate with a options having undefined members.
1.385 djm 361: */
362: static struct addrinfo *
1.400 djm 363: resolve_canonicalize(char **hostp, int port)
1.385 djm 364: {
365: int i, ndots;
1.413 djm 366: char *cp, *fullhost, newname[NI_MAXHOST];
1.385 djm 367: struct addrinfo *addrs;
368:
1.386 djm 369: if (options.canonicalize_hostname == SSH_CANONICALISE_NO)
1.385 djm 370: return NULL;
1.400 djm 371:
1.385 djm 372: /*
1.386 djm 373: * Don't attempt to canonicalize names that will be interpreted by
1.385 djm 374: * a proxy unless the user specifically requests so.
375: */
1.400 djm 376: if (!option_clear_or_none(options.proxy_command) &&
1.386 djm 377: options.canonicalize_hostname != SSH_CANONICALISE_ALWAYS)
1.385 djm 378: return NULL;
1.400 djm 379:
1.413 djm 380: /* Try numeric hostnames first */
381: if ((addrs = resolve_addr(*hostp, port,
382: newname, sizeof(newname))) != NULL) {
383: debug2("%s: hostname %.100s is address", __func__, *hostp);
384: if (strcasecmp(*hostp, newname) != 0) {
385: debug2("%s: canonicalised address \"%s\" => \"%s\"",
386: __func__, *hostp, newname);
387: free(*hostp);
388: *hostp = xstrdup(newname);
389: }
390: return addrs;
391: }
392:
1.387 djm 393: /* Don't apply canonicalization to sufficiently-qualified hostnames */
1.385 djm 394: ndots = 0;
395: for (cp = *hostp; *cp != '\0'; cp++) {
396: if (*cp == '.')
397: ndots++;
398: }
1.386 djm 399: if (ndots > options.canonicalize_max_dots) {
400: debug3("%s: not canonicalizing hostname \"%s\" (max dots %d)",
401: __func__, *hostp, options.canonicalize_max_dots);
1.385 djm 402: return NULL;
403: }
404: /* Attempt each supplied suffix */
405: for (i = 0; i < options.num_canonical_domains; i++) {
1.413 djm 406: *newname = '\0';
1.385 djm 407: xasprintf(&fullhost, "%s.%s.", *hostp,
408: options.canonical_domains[i]);
1.400 djm 409: debug3("%s: attempting \"%s\" => \"%s\"", __func__,
410: *hostp, fullhost);
411: if ((addrs = resolve_host(fullhost, port, 0,
1.413 djm 412: newname, sizeof(newname))) == NULL) {
1.385 djm 413: free(fullhost);
414: continue;
415: }
416: /* Remove trailing '.' */
417: fullhost[strlen(fullhost) - 1] = '\0';
418: /* Follow CNAME if requested */
1.413 djm 419: if (!check_follow_cname(&fullhost, newname)) {
1.386 djm 420: debug("Canonicalized hostname \"%s\" => \"%s\"",
1.385 djm 421: *hostp, fullhost);
422: }
423: free(*hostp);
424: *hostp = fullhost;
425: return addrs;
426: }
1.386 djm 427: if (!options.canonicalize_fallback_local)
1.400 djm 428: fatal("%s: Could not resolve host \"%s\"", __progname, *hostp);
429: debug2("%s: host %s not found in any suffix", __func__, *hostp);
1.385 djm 430: return NULL;
431: }
432:
1.32 deraadt 433: /*
1.400 djm 434: * Read per-user configuration file. Ignore the system wide config
435: * file if the user specifies a config file on the command line.
436: */
437: static void
1.408 djm 438: process_config_files(const char *host_arg, struct passwd *pw, int post_canon)
1.400 djm 439: {
1.414 deraadt 440: char buf[PATH_MAX];
1.400 djm 441: int r;
442:
443: if (config != NULL) {
444: if (strcasecmp(config, "none") != 0 &&
1.408 djm 445: !read_config_file(config, pw, host, host_arg, &options,
446: SSHCONF_USERCONF | (post_canon ? SSHCONF_POSTCANON : 0)))
1.400 djm 447: fatal("Can't open user config file %.100s: "
448: "%.100s", config, strerror(errno));
449: } else {
450: r = snprintf(buf, sizeof buf, "%s/%s", pw->pw_dir,
451: _PATH_SSH_USER_CONFFILE);
452: if (r > 0 && (size_t)r < sizeof(buf))
1.408 djm 453: (void)read_config_file(buf, pw, host, host_arg,
454: &options, SSHCONF_CHECKPERM | SSHCONF_USERCONF |
455: (post_canon ? SSHCONF_POSTCANON : 0));
1.400 djm 456:
457: /* Read systemwide configuration file after user config. */
1.408 djm 458: (void)read_config_file(_PATH_HOST_CONFIG_FILE, pw,
459: host, host_arg, &options,
460: post_canon ? SSHCONF_POSTCANON : 0);
461: }
462: }
463:
464: /* Rewrite the port number in an addrinfo list of addresses */
465: static void
466: set_addrinfo_port(struct addrinfo *addrs, int port)
467: {
468: struct addrinfo *addr;
469:
470: for (addr = addrs; addr != NULL; addr = addr->ai_next) {
471: switch (addr->ai_family) {
472: case AF_INET:
473: ((struct sockaddr_in *)addr->ai_addr)->
474: sin_port = htons(port);
475: break;
476: case AF_INET6:
477: ((struct sockaddr_in6 *)addr->ai_addr)->
478: sin6_port = htons(port);
479: break;
480: }
1.400 djm 481: }
482: }
483:
484: /*
1.32 deraadt 485: * Main program for the ssh client.
486: */
1.2 provos 487: int
488: main(int ac, char **av)
1.1 deraadt 489: {
1.408 djm 490: int i, r, opt, exit_status, use_syslog, config_test = 0;
1.414 deraadt 491: char *p, *cp, *line, *argv0, buf[PATH_MAX], *host_arg, *logfile;
1.358 djm 492: char thishost[NI_MAXHOST], shorthost[NI_MAXHOST], portstr[NI_MAXSERV];
1.385 djm 493: char cname[NI_MAXHOST];
1.31 markus 494: struct stat st;
1.98 markus 495: struct passwd *pw;
1.382 djm 496: int timeout_ms;
1.144 stevesk 497: extern int optind, optreset;
498: extern char *optarg;
1.406 millert 499: struct Forward fwd;
1.385 djm 500: struct addrinfo *addrs = NULL;
1.405 djm 501: struct ssh_digest_ctx *md;
502: u_char conn_hash[SSH_DIGEST_MAX_LENGTH];
503: char *conn_hash_hex;
1.250 djm 504:
505: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
506: sanitise_stdfd();
1.31 markus 507:
1.33 markus 508: /*
1.346 djm 509: * Discard other fds that are hanging around. These can cause problem
510: * with backgrounded ssh processes started by ControlPersist.
511: */
512: closefrom(STDERR_FILENO + 1);
513:
514: /*
1.33 markus 515: * Save the original real uid. It will be needed later (uid-swapping
516: * may clobber the real uid).
517: */
1.31 markus 518: original_real_uid = getuid();
519: original_effective_uid = geteuid();
520:
1.184 stevesk 521: /*
522: * Use uid-swapping to give up root privileges for the duration of
523: * option processing. We will re-instantiate the rights when we are
524: * ready to create the privileged port, and will permanently drop
525: * them when the port has been created (actually, when the connection
526: * has been made, as we may need to create the port several times).
527: */
528: PRIV_END;
529:
1.31 markus 530: /* If we are installed setuid root be careful to not drop core. */
531: if (original_real_uid != original_effective_uid) {
532: struct rlimit rlim;
533: rlim.rlim_cur = rlim.rlim_max = 0;
534: if (setrlimit(RLIMIT_CORE, &rlim) < 0)
535: fatal("setrlimit failed: %.100s", strerror(errno));
1.1 deraadt 536: }
1.107 markus 537: /* Get user data. */
538: pw = getpwuid(original_real_uid);
539: if (!pw) {
1.380 djm 540: logit("No user exists for uid %lu", (u_long)original_real_uid);
1.257 dtucker 541: exit(255);
1.107 markus 542: }
543: /* Take a copy of the returned structure. */
544: pw = pwcopy(pw);
1.31 markus 545:
1.33 markus 546: /*
547: * Set our umask to something reasonable, as some files are created
548: * with the default umask. This will make them world-readable but
549: * writable only by the owner, which is ok for all files for which we
550: * don't set the modes explicitly.
551: */
1.31 markus 552: umask(022);
553:
1.316 djm 554: /*
555: * Initialize option structure to indicate that no values have been
556: * set.
557: */
1.31 markus 558: initialize_options(&options);
559:
560: /* Parse command-line arguments. */
561: host = NULL;
1.320 djm 562: use_syslog = 0;
1.375 dtucker 563: logfile = NULL;
1.325 markus 564: argv0 = av[0];
1.31 markus 565:
1.266 djm 566: again:
1.316 djm 567: while ((opt = getopt(ac, av, "1246ab:c:e:fgi:kl:m:no:p:qstvx"
1.408 djm 568: "ACD:E:F:GI:KL:MNO:PQ:R:S:TVw:W:XYy")) != -1) {
1.31 markus 569: switch (opt) {
1.91 jakob 570: case '1':
571: options.protocol = SSH_PROTO_1;
572: break;
1.47 markus 573: case '2':
574: options.protocol = SSH_PROTO_2;
575: break;
1.37 markus 576: case '4':
1.196 djm 577: options.address_family = AF_INET;
1.37 markus 578: break;
579: case '6':
1.196 djm 580: options.address_family = AF_INET6;
1.37 markus 581: break;
1.31 markus 582: case 'n':
583: stdin_null_flag = 1;
584: break;
585: case 'f':
586: fork_after_authentication_flag = 1;
587: stdin_null_flag = 1;
588: break;
589: case 'x':
590: options.forward_x11 = 0;
591: break;
592: case 'X':
593: options.forward_x11 = 1;
594: break;
1.320 djm 595: case 'y':
596: use_syslog = 1;
597: break;
1.375 dtucker 598: case 'E':
599: logfile = xstrdup(optarg);
600: break;
1.408 djm 601: case 'G':
602: config_test = 1;
603: break;
1.202 markus 604: case 'Y':
605: options.forward_x11 = 1;
606: options.forward_x11_trusted = 1;
607: break;
1.31 markus 608: case 'g':
1.406 millert 609: options.fwd_opts.gateway_ports = 1;
1.31 markus 610: break;
1.229 djm 611: case 'O':
1.332 djm 612: if (stdio_forward_host != NULL)
613: fatal("Cannot specify multiplexing "
614: "command with -W");
615: else if (muxclient_command != 0)
616: fatal("Multiplexing command already specified");
1.229 djm 617: if (strcmp(optarg, "check") == 0)
1.312 djm 618: muxclient_command = SSHMUX_COMMAND_ALIVE_CHECK;
1.338 markus 619: else if (strcmp(optarg, "forward") == 0)
620: muxclient_command = SSHMUX_COMMAND_FORWARD;
1.229 djm 621: else if (strcmp(optarg, "exit") == 0)
1.312 djm 622: muxclient_command = SSHMUX_COMMAND_TERMINATE;
1.357 djm 623: else if (strcmp(optarg, "stop") == 0)
624: muxclient_command = SSHMUX_COMMAND_STOP;
1.365 djm 625: else if (strcmp(optarg, "cancel") == 0)
626: muxclient_command = SSHMUX_COMMAND_CANCEL_FWD;
1.229 djm 627: else
628: fatal("Invalid multiplex command.");
629: break;
1.183 stevesk 630: case 'P': /* deprecated */
1.31 markus 631: options.use_privileged_port = 0;
1.376 djm 632: break;
1.394 deraadt 633: case 'Q':
1.376 djm 634: cp = NULL;
1.394 deraadt 635: if (strcmp(optarg, "cipher") == 0)
1.393 djm 636: cp = cipher_alg_list('\n', 0);
1.394 deraadt 637: else if (strcmp(optarg, "cipher-auth") == 0)
1.393 djm 638: cp = cipher_alg_list('\n', 1);
1.394 deraadt 639: else if (strcmp(optarg, "mac") == 0)
1.392 dtucker 640: cp = mac_alg_list('\n');
1.394 deraadt 641: else if (strcmp(optarg, "kex") == 0)
1.392 dtucker 642: cp = kex_alg_list('\n');
1.394 deraadt 643: else if (strcmp(optarg, "key") == 0)
1.396 markus 644: cp = key_alg_list(0, 0);
645: else if (strcmp(optarg, "key-cert") == 0)
646: cp = key_alg_list(1, 0);
647: else if (strcmp(optarg, "key-plain") == 0)
648: cp = key_alg_list(0, 1);
1.416 djm 649: else if (strcmp(optarg, "protocol-version") == 0) {
650: #ifdef WITH_SSH1
651: cp = xstrdup("1\n2");
652: #else
653: cp = xstrdup("2");
654: #endif
655: }
1.376 djm 656: if (cp == NULL)
657: fatal("Unsupported query \"%s\"", optarg);
658: printf("%s\n", cp);
659: free(cp);
660: exit(0);
1.31 markus 661: break;
662: case 'a':
663: options.forward_agent = 0;
1.53 markus 664: break;
665: case 'A':
666: options.forward_agent = 1;
1.31 markus 667: break;
668: case 'k':
1.204 dtucker 669: options.gss_deleg_creds = 0;
1.297 djm 670: break;
671: case 'K':
672: options.gss_authentication = 1;
673: options.gss_deleg_creds = 1;
1.31 markus 674: break;
675: case 'i':
676: if (stat(optarg, &st) < 0) {
1.128 fgsch 677: fprintf(stderr, "Warning: Identity file %s "
1.231 otto 678: "not accessible: %s.\n", optarg,
679: strerror(errno));
1.31 markus 680: break;
681: }
1.371 dtucker 682: add_identity_file(&options, NULL, optarg, 1);
1.31 markus 683: break;
1.127 markus 684: case 'I':
1.333 markus 685: #ifdef ENABLE_PKCS11
686: options.pkcs11_provider = xstrdup(optarg);
1.137 jakob 687: #else
1.333 markus 688: fprintf(stderr, "no support for PKCS#11.\n");
1.137 jakob 689: #endif
1.127 markus 690: break;
1.31 markus 691: case 't':
1.359 djm 692: if (options.request_tty == REQUEST_TTY_YES)
693: options.request_tty = REQUEST_TTY_FORCE;
694: else
695: options.request_tty = REQUEST_TTY_YES;
1.31 markus 696: break;
697: case 'v':
1.197 markus 698: if (debug_flag == 0) {
1.66 markus 699: debug_flag = 1;
700: options.log_level = SYSLOG_LEVEL_DEBUG1;
1.197 markus 701: } else {
702: if (options.log_level < SYSLOG_LEVEL_DEBUG3)
703: options.log_level++;
704: }
1.375 dtucker 705: break;
1.31 markus 706: case 'V':
1.209 markus 707: fprintf(stderr, "%s, %s\n",
1.402 markus 708: SSH_VERSION,
709: #ifdef WITH_OPENSSL
710: SSLeay_version(SSLEAY_VERSION)
711: #else
712: "without OpenSSL"
713: #endif
714: );
1.31 markus 715: if (opt == 'V')
716: exit(0);
717: break;
1.255 reyk 718: case 'w':
1.256 reyk 719: if (options.tun_open == -1)
720: options.tun_open = SSH_TUNMODE_DEFAULT;
1.255 reyk 721: options.tun_local = a2tun(optarg, &options.tun_remote);
1.256 reyk 722: if (options.tun_local == SSH_TUNID_ERR) {
1.316 djm 723: fprintf(stderr,
724: "Bad tun device '%s'\n", optarg);
1.257 dtucker 725: exit(255);
1.255 reyk 726: }
727: break;
1.331 dtucker 728: case 'W':
1.332 djm 729: if (stdio_forward_host != NULL)
730: fatal("stdio forward already specified");
731: if (muxclient_command != 0)
732: fatal("Cannot specify stdio forward with -O");
1.331 dtucker 733: if (parse_forward(&fwd, optarg, 1, 0)) {
734: stdio_forward_host = fwd.listen_host;
735: stdio_forward_port = fwd.listen_port;
1.378 djm 736: free(fwd.connect_host);
1.331 dtucker 737: } else {
738: fprintf(stderr,
739: "Bad stdio forwarding specification '%s'\n",
740: optarg);
741: exit(255);
742: }
1.359 djm 743: options.request_tty = REQUEST_TTY_NO;
1.331 dtucker 744: no_shell_flag = 1;
745: options.clear_forwardings = 1;
746: options.exit_on_forward_failure = 1;
747: break;
1.31 markus 748: case 'q':
749: options.log_level = SYSLOG_LEVEL_QUIET;
750: break;
751: case 'e':
752: if (optarg[0] == '^' && optarg[2] == 0 &&
1.128 fgsch 753: (u_char) optarg[1] >= 64 &&
754: (u_char) optarg[1] < 128)
1.78 markus 755: options.escape_char = (u_char) optarg[1] & 31;
1.31 markus 756: else if (strlen(optarg) == 1)
1.78 markus 757: options.escape_char = (u_char) optarg[0];
1.31 markus 758: else if (strcmp(optarg, "none") == 0)
1.119 stevesk 759: options.escape_char = SSH_ESCAPECHAR_NONE;
1.31 markus 760: else {
1.128 fgsch 761: fprintf(stderr, "Bad escape character '%s'.\n",
762: optarg);
1.257 dtucker 763: exit(255);
1.31 markus 764: }
765: break;
766: case 'c':
1.49 markus 767: if (ciphers_valid(optarg)) {
768: /* SSH2 only */
769: options.ciphers = xstrdup(optarg);
1.224 markus 770: options.cipher = SSH_CIPHER_INVALID;
1.49 markus 771: } else {
772: /* SSH1 only */
1.74 markus 773: options.cipher = cipher_number(optarg);
774: if (options.cipher == -1) {
1.128 fgsch 775: fprintf(stderr,
776: "Unknown cipher type '%s'\n",
777: optarg);
1.257 dtucker 778: exit(255);
1.49 markus 779: }
1.128 fgsch 780: if (options.cipher == SSH_CIPHER_3DES)
1.74 markus 781: options.ciphers = "3des-cbc";
1.128 fgsch 782: else if (options.cipher == SSH_CIPHER_BLOWFISH)
1.74 markus 783: options.ciphers = "blowfish-cbc";
1.128 fgsch 784: else
1.74 markus 785: options.ciphers = (char *)-1;
1.95 markus 786: }
787: break;
788: case 'm':
789: if (mac_valid(optarg))
790: options.macs = xstrdup(optarg);
791: else {
1.128 fgsch 792: fprintf(stderr, "Unknown mac type '%s'\n",
793: optarg);
1.257 dtucker 794: exit(255);
1.31 markus 795: }
796: break;
1.214 djm 797: case 'M':
1.242 djm 798: if (options.control_master == SSHCTL_MASTER_YES)
799: options.control_master = SSHCTL_MASTER_ASK;
800: else
801: options.control_master = SSHCTL_MASTER_YES;
1.214 djm 802: break;
1.31 markus 803: case 'p':
1.113 stevesk 804: options.port = a2port(optarg);
1.323 djm 805: if (options.port <= 0) {
1.109 markus 806: fprintf(stderr, "Bad port '%s'\n", optarg);
1.257 dtucker 807: exit(255);
1.109 markus 808: }
1.31 markus 809: break;
810: case 'l':
811: options.user = optarg;
812: break;
1.141 stevesk 813:
814: case 'L':
1.324 djm 815: if (parse_forward(&fwd, optarg, 0, 0))
1.232 djm 816: add_local_forward(&options, &fwd);
817: else {
1.128 fgsch 818: fprintf(stderr,
1.232 djm 819: "Bad local forwarding specification '%s'\n",
1.128 fgsch 820: optarg);
1.257 dtucker 821: exit(255);
1.31 markus 822: }
1.232 djm 823: break;
824:
825: case 'R':
1.324 djm 826: if (parse_forward(&fwd, optarg, 0, 1)) {
1.232 djm 827: add_remote_forward(&options, &fwd);
828: } else {
1.128 fgsch 829: fprintf(stderr,
1.232 djm 830: "Bad remote forwarding specification "
831: "'%s'\n", optarg);
1.257 dtucker 832: exit(255);
1.31 markus 833: }
834: break;
1.108 markus 835:
836: case 'D':
1.324 djm 837: if (parse_forward(&fwd, optarg, 1, 0)) {
1.322 stevesk 838: add_local_forward(&options, &fwd);
1.232 djm 839: } else {
1.322 stevesk 840: fprintf(stderr,
841: "Bad dynamic forwarding specification "
842: "'%s'\n", optarg);
1.257 dtucker 843: exit(255);
1.109 markus 844: }
1.108 markus 845: break;
846:
1.31 markus 847: case 'C':
848: options.compression = 1;
849: break;
1.45 markus 850: case 'N':
851: no_shell_flag = 1;
1.359 djm 852: options.request_tty = REQUEST_TTY_NO;
1.45 markus 853: break;
854: case 'T':
1.359 djm 855: options.request_tty = REQUEST_TTY_NO;
1.45 markus 856: break;
1.31 markus 857: case 'o':
1.205 markus 858: line = xstrdup(optarg);
1.408 djm 859: if (process_config_line(&options, pw,
860: host ? host : "", host ? host : "", line,
861: "command-line", 0, NULL, SSHCONF_USERCONF) != 0)
1.257 dtucker 862: exit(255);
1.378 djm 863: free(line);
1.31 markus 864: break;
1.85 djm 865: case 's':
866: subsystem_flag = 1;
1.117 markus 867: break;
1.214 djm 868: case 'S':
869: if (options.control_path != NULL)
870: free(options.control_path);
871: options.control_path = xstrdup(optarg);
872: break;
1.117 markus 873: case 'b':
874: options.bind_address = optarg;
1.85 djm 875: break;
1.139 markus 876: case 'F':
877: config = optarg;
878: break;
1.31 markus 879: default:
880: usage();
1.1 deraadt 881: }
1.31 markus 882: }
883:
1.128 fgsch 884: ac -= optind;
885: av += optind;
886:
1.329 guenther 887: if (ac > 0 && !host) {
1.188 markus 888: if (strrchr(*av, '@')) {
1.128 fgsch 889: p = xstrdup(*av);
1.188 markus 890: cp = strrchr(p, '@');
1.128 fgsch 891: if (cp == NULL || cp == p)
892: usage();
893: options.user = p;
894: *cp = '\0';
1.385 djm 895: host = xstrdup(++cp);
1.128 fgsch 896: } else
1.385 djm 897: host = xstrdup(*av);
1.189 millert 898: if (ac > 1) {
899: optind = optreset = 1;
1.128 fgsch 900: goto again;
901: }
1.189 millert 902: ac--, av++;
1.128 fgsch 903: }
904:
1.31 markus 905: /* Check that we got a host name. */
906: if (!host)
907: usage();
908:
1.385 djm 909: host_arg = xstrdup(host);
910:
1.402 markus 911: #ifdef WITH_OPENSSL
1.350 djm 912: OpenSSL_add_all_algorithms();
1.72 markus 913: ERR_load_crypto_strings();
1.402 markus 914: #endif
1.31 markus 915:
916: /* Initialize the command to execute on remote host. */
917: buffer_init(&command);
1.1 deraadt 918:
1.33 markus 919: /*
920: * Save the command to execute on the remote host in a buffer. There
921: * is no limit on the length of the command, except by the maximum
922: * packet size. Also sets the tty flag if there is no command.
923: */
1.128 fgsch 924: if (!ac) {
1.31 markus 925: /* No command specified - execute shell on a tty. */
1.85 djm 926: if (subsystem_flag) {
1.128 fgsch 927: fprintf(stderr,
928: "You must specify a subsystem to invoke.\n");
1.85 djm 929: usage();
930: }
1.31 markus 931: } else {
1.128 fgsch 932: /* A command has been specified. Store it into the buffer. */
933: for (i = 0; i < ac; i++) {
934: if (i)
1.31 markus 935: buffer_append(&command, " ", 1);
936: buffer_append(&command, av[i], strlen(av[i]));
937: }
938: }
939:
940: /* Cannot fork to background if no command. */
1.316 djm 941: if (fork_after_authentication_flag && buffer_len(&command) == 0 &&
942: !no_shell_flag)
943: fatal("Cannot fork into background without a command "
944: "to execute.");
1.31 markus 945:
1.101 markus 946: /*
947: * Initialize "log" output. Since we are the client all output
1.375 dtucker 948: * goes to stderr unless otherwise specified by -y or -E.
1.101 markus 949: */
1.375 dtucker 950: if (use_syslog && logfile != NULL)
951: fatal("Can't specify both -y and -E");
952: if (logfile != NULL) {
953: log_redirect_stderr_to(logfile);
1.378 djm 954: free(logfile);
1.375 dtucker 955: }
1.325 markus 956: log_init(argv0,
1.316 djm 957: options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level,
1.320 djm 958: SYSLOG_FACILITY_USER, !use_syslog);
1.375 dtucker 959:
960: if (debug_flag)
1.402 markus 961: logit("%s, %s", SSH_VERSION,
962: #ifdef WITH_OPENSSL
963: SSLeay_version(SSLEAY_VERSION)
964: #else
965: "without OpenSSL"
966: #endif
967: );
1.31 markus 968:
1.400 djm 969: /* Parse the configuration files */
1.408 djm 970: process_config_files(host_arg, pw, 0);
1.400 djm 971:
972: /* Hostname canonicalisation needs a few options filled. */
973: fill_default_options_for_canonicalization(&options);
974:
975: /* If the user has replaced the hostname then take it into use now */
976: if (options.hostname != NULL) {
977: /* NB. Please keep in sync with readconf.c:match_cfg_line() */
978: cp = percent_expand(options.hostname,
979: "h", host, (char *)NULL);
980: free(host);
981: host = cp;
1.408 djm 982: free(options.hostname);
983: options.hostname = xstrdup(host);
1.400 djm 984: }
985:
986: /* If canonicalization requested then try to apply it */
987: lowercase(host);
988: if (options.canonicalize_hostname != SSH_CANONICALISE_NO)
989: addrs = resolve_canonicalize(&host, options.port);
990:
1.139 markus 991: /*
1.401 djm 992: * If CanonicalizePermittedCNAMEs have been specified but
993: * other canonicalization did not happen (by not being requested
994: * or by failing with fallback) then the hostname may still be changed
995: * as a result of CNAME following.
996: *
997: * Try to resolve the bare hostname name using the system resolver's
998: * usual search rules and then apply the CNAME follow rules.
999: *
1000: * Skip the lookup if a ProxyCommand is being used unless the user
1001: * has specifically requested canonicalisation for this case via
1002: * CanonicalizeHostname=always
1.139 markus 1003: */
1.401 djm 1004: if (addrs == NULL && options.num_permitted_cnames != 0 &&
1005: (option_clear_or_none(options.proxy_command) ||
1.400 djm 1006: options.canonicalize_hostname == SSH_CANONICALISE_ALWAYS)) {
1.403 djm 1007: if ((addrs = resolve_host(host, options.port,
1008: option_clear_or_none(options.proxy_command),
1009: cname, sizeof(cname))) == NULL) {
1010: /* Don't fatal proxied host names not in the DNS */
1011: if (option_clear_or_none(options.proxy_command))
1012: cleanup_exit(255); /* logged in resolve_host */
1013: } else
1014: check_follow_cname(&host, cname);
1.400 djm 1015: }
1.139 markus 1016:
1.400 djm 1017: /*
1.408 djm 1018: * If canonicalisation is enabled then re-parse the configuration
1019: * files as new stanzas may match.
1.400 djm 1020: */
1.408 djm 1021: if (options.canonicalize_hostname != 0) {
1022: debug("Re-reading configuration after hostname "
1023: "canonicalisation");
1024: free(options.hostname);
1025: options.hostname = xstrdup(host);
1026: process_config_files(host_arg, pw, 1);
1027: /*
1028: * Address resolution happens early with canonicalisation
1029: * enabled and the port number may have changed since, so
1030: * reset it in address list
1031: */
1032: if (addrs != NULL && options.port > 0)
1033: set_addrinfo_port(addrs, options.port);
1.139 markus 1034: }
1.31 markus 1035:
1036: /* Fill configuration defaults. */
1037: fill_default_options(&options);
1038:
1.400 djm 1039: if (options.port == 0)
1040: options.port = default_ssh_port();
1.196 djm 1041: channel_set_af(options.address_family);
1042:
1.383 djm 1043: /* Tidy and check options */
1044: if (options.host_key_alias != NULL)
1045: lowercase(options.host_key_alias);
1046: if (options.proxy_command != NULL &&
1047: strcmp(options.proxy_command, "-") == 0 &&
1048: options.proxy_use_fdpass)
1049: fatal("ProxyCommand=- and ProxyUseFDPass are incompatible");
1.415 djm 1050: if (options.control_persist &&
1051: options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK) {
1052: debug("UpdateHostKeys=ask is incompatible with ControlPersist; "
1053: "disabling");
1054: options.update_hostkeys = 0;
1055: }
1.388 djm 1056: if (original_effective_uid != 0)
1057: options.use_privileged_port = 0;
1.383 djm 1058:
1.31 markus 1059: /* reinit */
1.325 markus 1060: log_init(argv0, options.log_level, SYSLOG_FACILITY_USER, !use_syslog);
1.370 djm 1061:
1062: if (options.request_tty == REQUEST_TTY_YES ||
1063: options.request_tty == REQUEST_TTY_FORCE)
1064: tty_flag = 1;
1065:
1066: /* Allocate a tty by default if no command specified. */
1067: if (buffer_len(&command) == 0)
1068: tty_flag = options.request_tty != REQUEST_TTY_NO;
1069:
1070: /* Force no tty */
1071: if (options.request_tty == REQUEST_TTY_NO || muxclient_command != 0)
1072: tty_flag = 0;
1073: /* Do not allocate a tty if stdin is not a tty. */
1074: if ((!isatty(fileno(stdin)) || stdin_null_flag) &&
1075: options.request_tty != REQUEST_TTY_FORCE) {
1076: if (tty_flag)
1077: logit("Pseudo-terminal will not be allocated because "
1078: "stdin is not a terminal.");
1079: tty_flag = 0;
1080: }
1.31 markus 1081:
1082: if (options.user == NULL)
1083: options.user = xstrdup(pw->pw_name);
1.343 djm 1084:
1.358 djm 1085: if (gethostname(thishost, sizeof(thishost)) == -1)
1086: fatal("gethostname: %s", strerror(errno));
1087: strlcpy(shorthost, thishost, sizeof(shorthost));
1088: shorthost[strcspn(thishost, ".")] = '\0';
1089: snprintf(portstr, sizeof(portstr), "%d", options.port);
1090:
1.405 djm 1091: if ((md = ssh_digest_start(SSH_DIGEST_SHA1)) == NULL ||
1092: ssh_digest_update(md, thishost, strlen(thishost)) < 0 ||
1093: ssh_digest_update(md, host, strlen(host)) < 0 ||
1094: ssh_digest_update(md, portstr, strlen(portstr)) < 0 ||
1095: ssh_digest_update(md, options.user, strlen(options.user)) < 0 ||
1096: ssh_digest_final(md, conn_hash, sizeof(conn_hash)) < 0)
1097: fatal("%s: mux digest failed", __func__);
1098: ssh_digest_free(md);
1099: conn_hash_hex = tohex(conn_hash, ssh_digest_bytes(SSH_DIGEST_SHA1));
1100:
1.317 dtucker 1101: if (options.local_command != NULL) {
1102: debug3("expanding LocalCommand: %s", options.local_command);
1103: cp = options.local_command;
1.405 djm 1104: options.local_command = percent_expand(cp,
1105: "C", conn_hash_hex,
1106: "L", shorthost,
1107: "d", pw->pw_dir,
1108: "h", host,
1109: "l", thishost,
1110: "n", host_arg,
1111: "p", portstr,
1112: "r", options.user,
1113: "u", pw->pw_name,
1.358 djm 1114: (char *)NULL);
1.317 dtucker 1115: debug3("expanded LocalCommand: %s", options.local_command);
1.378 djm 1116: free(cp);
1.304 dtucker 1117: }
1.31 markus 1118:
1.214 djm 1119: if (options.control_path != NULL) {
1.241 djm 1120: cp = tilde_expand_filename(options.control_path,
1121: original_real_uid);
1.378 djm 1122: free(options.control_path);
1.405 djm 1123: options.control_path = percent_expand(cp,
1124: "C", conn_hash_hex,
1125: "L", shorthost,
1126: "h", host,
1127: "l", thishost,
1128: "n", host_arg,
1129: "p", portstr,
1130: "r", options.user,
1131: "u", pw->pw_name,
1.358 djm 1132: (char *)NULL);
1.378 djm 1133: free(cp);
1.214 djm 1134: }
1.405 djm 1135: free(conn_hash_hex);
1.408 djm 1136:
1137: if (config_test) {
1138: dump_client_config(&options, host);
1139: exit(0);
1140: }
1.405 djm 1141:
1.312 djm 1142: if (muxclient_command != 0 && options.control_path == NULL)
1.240 djm 1143: fatal("No ControlPath specified for \"-O\" command");
1.242 djm 1144: if (options.control_path != NULL)
1.312 djm 1145: muxclient(options.control_path);
1.401 djm 1146:
1147: /*
1148: * If hostname canonicalisation was not enabled, then we may not
1149: * have yet resolved the hostname. Do so now.
1150: */
1151: if (addrs == NULL && options.proxy_command == NULL) {
1152: if ((addrs = resolve_host(host, options.port, 1,
1153: cname, sizeof(cname))) == NULL)
1154: cleanup_exit(255); /* resolve_host logs the error */
1155: }
1.214 djm 1156:
1.303 djm 1157: timeout_ms = options.connection_timeout * 1000;
1158:
1.77 markus 1159: /* Open a connection to the remote host. */
1.385 djm 1160: if (ssh_connect(host, addrs, &hostaddr, options.port,
1161: options.address_family, options.connection_attempts,
1162: &timeout_ms, options.tcp_keep_alive,
1.388 djm 1163: options.use_privileged_port) != 0)
1.257 dtucker 1164: exit(255);
1.31 markus 1165:
1.391 djm 1166: if (addrs != NULL)
1167: freeaddrinfo(addrs);
1168:
1.385 djm 1169: packet_set_timeout(options.server_alive_interval,
1170: options.server_alive_count_max);
1171:
1.303 djm 1172: if (timeout_ms > 0)
1173: debug3("timeout: %d ms remain after connect", timeout_ms);
1174:
1.33 markus 1175: /*
1176: * If we successfully made the connection, load the host private key
1177: * in case we will need it later for combined rsa-rhosts
1178: * authentication. This must be done before releasing extra
1179: * privileges, because the file is only readable by root.
1.174 markus 1180: * If we cannot access the private keys, load the public keys
1181: * instead and try to execute the ssh-keysign helper instead.
1.33 markus 1182: */
1.112 markus 1183: sensitive_data.nkeys = 0;
1184: sensitive_data.keys = NULL;
1.173 markus 1185: sensitive_data.external_keysign = 0;
1.178 markus 1186: if (options.rhosts_rsa_authentication ||
1187: options.hostbased_authentication) {
1.397 djm 1188: sensitive_data.nkeys = 9;
1.274 deraadt 1189: sensitive_data.keys = xcalloc(sensitive_data.nkeys,
1.180 deraadt 1190: sizeof(Key));
1.177 markus 1191:
1192: PRIV_START;
1.112 markus 1193: sensitive_data.keys[0] = key_load_private_type(KEY_RSA1,
1.276 dtucker 1194: _PATH_HOST_KEY_FILE, "", NULL, NULL);
1.411 djm 1195: sensitive_data.keys[1] = key_load_private_cert(KEY_ECDSA,
1.349 djm 1196: _PATH_HOST_ECDSA_KEY_FILE, "", NULL);
1.411 djm 1197: sensitive_data.keys[2] = key_load_private_cert(KEY_ED25519,
1198: _PATH_HOST_ED25519_KEY_FILE, "", NULL);
1.349 djm 1199: sensitive_data.keys[3] = key_load_private_cert(KEY_RSA,
1.345 djm 1200: _PATH_HOST_RSA_KEY_FILE, "", NULL);
1.411 djm 1201: sensitive_data.keys[4] = key_load_private_cert(KEY_DSA,
1202: _PATH_HOST_DSA_KEY_FILE, "", NULL);
1203: sensitive_data.keys[5] = key_load_private_type(KEY_ECDSA,
1.349 djm 1204: _PATH_HOST_ECDSA_KEY_FILE, "", NULL, NULL);
1.411 djm 1205: sensitive_data.keys[6] = key_load_private_type(KEY_ED25519,
1206: _PATH_HOST_ED25519_KEY_FILE, "", NULL, NULL);
1.397 djm 1207: sensitive_data.keys[7] = key_load_private_type(KEY_RSA,
1.276 dtucker 1208: _PATH_HOST_RSA_KEY_FILE, "", NULL, NULL);
1.411 djm 1209: sensitive_data.keys[8] = key_load_private_type(KEY_DSA,
1210: _PATH_HOST_DSA_KEY_FILE, "", NULL, NULL);
1.177 markus 1211: PRIV_END;
1.173 markus 1212:
1.181 markus 1213: if (options.hostbased_authentication == 1 &&
1214: sensitive_data.keys[0] == NULL &&
1.349 djm 1215: sensitive_data.keys[5] == NULL &&
1.396 markus 1216: sensitive_data.keys[6] == NULL &&
1.397 djm 1217: sensitive_data.keys[7] == NULL &&
1218: sensitive_data.keys[8] == NULL) {
1.345 djm 1219: sensitive_data.keys[1] = key_load_cert(
1.411 djm 1220: _PATH_HOST_ECDSA_KEY_FILE);
1.345 djm 1221: sensitive_data.keys[2] = key_load_cert(
1.411 djm 1222: _PATH_HOST_ED25519_KEY_FILE);
1.349 djm 1223: sensitive_data.keys[3] = key_load_cert(
1.345 djm 1224: _PATH_HOST_RSA_KEY_FILE);
1.397 djm 1225: sensitive_data.keys[4] = key_load_cert(
1.411 djm 1226: _PATH_HOST_DSA_KEY_FILE);
1.397 djm 1227: sensitive_data.keys[5] = key_load_public(
1.411 djm 1228: _PATH_HOST_ECDSA_KEY_FILE, NULL);
1.397 djm 1229: sensitive_data.keys[6] = key_load_public(
1.411 djm 1230: _PATH_HOST_ED25519_KEY_FILE, NULL);
1.397 djm 1231: sensitive_data.keys[7] = key_load_public(
1.173 markus 1232: _PATH_HOST_RSA_KEY_FILE, NULL);
1.397 djm 1233: sensitive_data.keys[8] = key_load_public(
1.411 djm 1234: _PATH_HOST_DSA_KEY_FILE, NULL);
1.173 markus 1235: sensitive_data.external_keysign = 1;
1236: }
1.31 markus 1237: }
1.33 markus 1238: /*
1239: * Get rid of any extra privileges that we may have. We will no
1240: * longer need them. Also, extra privileges could make it very hard
1241: * to read identity files and other non-world-readable files from the
1242: * user's home directory if it happens to be on a NFS volume where
1243: * root is mapped to nobody.
1244: */
1.225 dtucker 1245: if (original_effective_uid == 0) {
1246: PRIV_START;
1247: permanently_set_uid(pw);
1248: }
1.31 markus 1249:
1.33 markus 1250: /*
1251: * Now that we are back to our own permissions, create ~/.ssh
1.254 djm 1252: * directory if it doesn't already exist.
1.33 markus 1253: */
1.367 djm 1254: if (config == NULL) {
1255: r = snprintf(buf, sizeof buf, "%s%s%s", pw->pw_dir,
1256: strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR);
1257: if (r > 0 && (size_t)r < sizeof(buf) && stat(buf, &st) < 0)
1258: if (mkdir(buf, 0700) < 0)
1259: error("Could not create directory '%.200s'.",
1260: buf);
1261: }
1.31 markus 1262:
1.104 markus 1263: /* load options.identity_files */
1264: load_public_identity_files();
1265:
1266: /* Expand ~ in known host file names. */
1.361 djm 1267: tilde_expand_paths(options.system_hostfiles,
1268: options.num_system_hostfiles);
1269: tilde_expand_paths(options.user_hostfiles, options.num_user_hostfiles);
1.149 markus 1270:
1271: signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
1.352 djm 1272: signal(SIGCHLD, main_sigchld_handler);
1.31 markus 1273:
1.316 djm 1274: /* Log into the remote system. Never returns if the login fails. */
1.303 djm 1275: ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr,
1.355 djm 1276: options.port, pw, timeout_ms);
1.339 djm 1277:
1278: if (packet_connection_is_on_socket()) {
1279: verbose("Authenticated to %s ([%s]:%d).", host,
1280: get_remote_ipaddr(), get_remote_port());
1281: } else {
1282: verbose("Authenticated to %s (via proxy).", host);
1283: }
1.31 markus 1284:
1.112 markus 1285: /* We no longer need the private host keys. Clear them now. */
1286: if (sensitive_data.nkeys != 0) {
1287: for (i = 0; i < sensitive_data.nkeys; i++) {
1288: if (sensitive_data.keys[i] != NULL) {
1289: /* Destroys contents safely */
1290: debug3("clear hostkey %d", i);
1291: key_free(sensitive_data.keys[i]);
1292: sensitive_data.keys[i] = NULL;
1293: }
1294: }
1.378 djm 1295: free(sensitive_data.keys);
1.134 markus 1296: }
1297: for (i = 0; i < options.num_identity_files; i++) {
1.378 djm 1298: free(options.identity_files[i]);
1299: options.identity_files[i] = NULL;
1.134 markus 1300: if (options.identity_keys[i]) {
1301: key_free(options.identity_keys[i]);
1302: options.identity_keys[i] = NULL;
1303: }
1.112 markus 1304: }
1.31 markus 1305:
1.45 markus 1306: exit_status = compat20 ? ssh_session2() : ssh_session();
1307: packet_close();
1.186 djm 1308:
1.312 djm 1309: if (options.control_path != NULL && muxserver_sock != -1)
1.214 djm 1310: unlink(options.control_path);
1311:
1.353 djm 1312: /* Kill ProxyCommand if it is running. */
1313: ssh_kill_proxy_command();
1.186 djm 1314:
1.45 markus 1315: return exit_status;
1316: }
1317:
1.344 djm 1318: static void
1319: control_persist_detach(void)
1320: {
1321: pid_t pid;
1.346 djm 1322: int devnull;
1.344 djm 1323:
1324: debug("%s: backgrounding master process", __func__);
1325:
1326: /*
1327: * master (current process) into the background, and make the
1328: * foreground process a client of the backgrounded master.
1329: */
1330: switch ((pid = fork())) {
1331: case -1:
1332: fatal("%s: fork: %s", __func__, strerror(errno));
1333: case 0:
1334: /* Child: master process continues mainloop */
1335: break;
1336: default:
1337: /* Parent: set up mux slave to connect to backgrounded master */
1338: debug2("%s: background process is %ld", __func__, (long)pid);
1339: stdin_null_flag = ostdin_null_flag;
1.359 djm 1340: options.request_tty = orequest_tty;
1.344 djm 1341: tty_flag = otty_flag;
1342: close(muxserver_sock);
1343: muxserver_sock = -1;
1.351 markus 1344: options.control_master = SSHCTL_MASTER_NO;
1.344 djm 1345: muxclient(options.control_path);
1346: /* muxclient() doesn't return on success. */
1347: fatal("Failed to connect to new control master");
1348: }
1.346 djm 1349: if ((devnull = open(_PATH_DEVNULL, O_RDWR)) == -1) {
1350: error("%s: open(\"/dev/null\"): %s", __func__,
1351: strerror(errno));
1352: } else {
1353: if (dup2(devnull, STDIN_FILENO) == -1 ||
1354: dup2(devnull, STDOUT_FILENO) == -1)
1355: error("%s: dup2: %s", __func__, strerror(errno));
1356: if (devnull > STDERR_FILENO)
1357: close(devnull);
1358: }
1.381 djm 1359: daemon(1, 1);
1.362 djm 1360: setproctitle("%s [mux]", options.control_path);
1.344 djm 1361: }
1362:
1363: /* Do fork() after authentication. Used by "ssh -f" */
1364: static void
1365: fork_postauth(void)
1366: {
1367: if (need_controlpersist_detach)
1368: control_persist_detach();
1369: debug("forking to background");
1370: fork_after_authentication_flag = 0;
1371: if (daemon(1, 1) < 0)
1372: fatal("daemon() failed: %.200s", strerror(errno));
1373: }
1374:
1.315 djm 1375: /* Callback for remote forward global requests */
1376: static void
1377: ssh_confirm_remote_forward(int type, u_int32_t seq, void *ctxt)
1378: {
1.406 millert 1379: struct Forward *rfwd = (struct Forward *)ctxt;
1.315 djm 1380:
1.324 djm 1381: /* XXX verbose() on failure? */
1.404 markus 1382: debug("remote forward %s for: listen %s%s%d, connect %s:%d",
1.315 djm 1383: type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
1.406 millert 1384: rfwd->listen_path ? rfwd->listen_path :
1385: rfwd->listen_host ? rfwd->listen_host : "",
1386: (rfwd->listen_path || rfwd->listen_host) ? ":" : "",
1387: rfwd->listen_port, rfwd->connect_path ? rfwd->connect_path :
1388: rfwd->connect_host, rfwd->connect_port);
1389: if (rfwd->listen_path == NULL && rfwd->listen_port == 0) {
1.366 markus 1390: if (type == SSH2_MSG_REQUEST_SUCCESS) {
1391: rfwd->allocated_port = packet_get_int();
1392: logit("Allocated port %u for remote forward to %s:%d",
1393: rfwd->allocated_port,
1394: rfwd->connect_host, rfwd->connect_port);
1395: channel_update_permitted_opens(rfwd->handle,
1396: rfwd->allocated_port);
1397: } else {
1398: channel_update_permitted_opens(rfwd->handle, -1);
1399: }
1.324 djm 1400: }
1401:
1.315 djm 1402: if (type == SSH2_MSG_REQUEST_FAILURE) {
1.406 millert 1403: if (options.exit_on_forward_failure) {
1404: if (rfwd->listen_path != NULL)
1405: fatal("Error: remote port forwarding failed "
1406: "for listen path %s", rfwd->listen_path);
1407: else
1408: fatal("Error: remote port forwarding failed "
1409: "for listen port %d", rfwd->listen_port);
1410: } else {
1411: if (rfwd->listen_path != NULL)
1412: logit("Warning: remote port forwarding failed "
1413: "for listen path %s", rfwd->listen_path);
1414: else
1415: logit("Warning: remote port forwarding failed "
1416: "for listen port %d", rfwd->listen_port);
1417: }
1.315 djm 1418: }
1.318 djm 1419: if (++remote_forward_confirms_received == options.num_remote_forwards) {
1.315 djm 1420: debug("All remote forwarding requests processed");
1.344 djm 1421: if (fork_after_authentication_flag)
1422: fork_postauth();
1.318 djm 1423: }
1.315 djm 1424: }
1425:
1.126 itojun 1426: static void
1.331 dtucker 1427: client_cleanup_stdio_fwd(int id, void *arg)
1428: {
1429: debug("stdio forwarding: done");
1430: cleanup_exit(0);
1431: }
1432:
1.368 djm 1433: static void
1.407 djm 1434: ssh_stdio_confirm(int id, int success, void *arg)
1435: {
1436: if (!success)
1437: fatal("stdio forwarding failed");
1438: }
1439:
1440: static void
1.368 djm 1441: ssh_init_stdio_forwarding(void)
1.331 dtucker 1442: {
1443: Channel *c;
1.332 djm 1444: int in, out;
1.331 dtucker 1445:
1.368 djm 1446: if (stdio_forward_host == NULL)
1447: return;
1.384 djm 1448: if (!compat20)
1.368 djm 1449: fatal("stdio forwarding require Protocol 2");
1450:
1451: debug3("%s: %s:%d", __func__, stdio_forward_host, stdio_forward_port);
1.332 djm 1452:
1.368 djm 1453: if ((in = dup(STDIN_FILENO)) < 0 ||
1454: (out = dup(STDOUT_FILENO)) < 0)
1.332 djm 1455: fatal("channel_connect_stdio_fwd: dup() in/out failed");
1.368 djm 1456: if ((c = channel_connect_stdio_fwd(stdio_forward_host,
1457: stdio_forward_port, in, out)) == NULL)
1458: fatal("%s: channel_connect_stdio_fwd failed", __func__);
1.331 dtucker 1459: channel_register_cleanup(c->self, client_cleanup_stdio_fwd, 0);
1.407 djm 1460: channel_register_open_confirm(c->self, ssh_stdio_confirm, NULL);
1.331 dtucker 1461: }
1462:
1463: static void
1.70 markus 1464: ssh_init_forwarding(void)
1465: {
1.86 markus 1466: int success = 0;
1.70 markus 1467: int i;
1.331 dtucker 1468:
1.70 markus 1469: /* Initiate local TCP/IP port forwardings. */
1470: for (i = 0; i < options.num_local_forwards; i++) {
1.232 djm 1471: debug("Local connections to %.200s:%d forwarded to remote "
1472: "address %.200s:%d",
1.406 millert 1473: (options.local_forwards[i].listen_path != NULL) ?
1474: options.local_forwards[i].listen_path :
1.234 deraadt 1475: (options.local_forwards[i].listen_host == NULL) ?
1.406 millert 1476: (options.fwd_opts.gateway_ports ? "*" : "LOCALHOST") :
1.232 djm 1477: options.local_forwards[i].listen_host,
1478: options.local_forwards[i].listen_port,
1.406 millert 1479: (options.local_forwards[i].connect_path != NULL) ?
1480: options.local_forwards[i].connect_path :
1.232 djm 1481: options.local_forwards[i].connect_host,
1482: options.local_forwards[i].connect_port);
1.158 markus 1483: success += channel_setup_local_fwd_listener(
1.406 millert 1484: &options.local_forwards[i], &options.fwd_opts);
1.70 markus 1485: }
1.283 markus 1486: if (i > 0 && success != i && options.exit_on_forward_failure)
1487: fatal("Could not request local forwarding.");
1.86 markus 1488: if (i > 0 && success == 0)
1489: error("Could not request local forwarding.");
1.70 markus 1490:
1491: /* Initiate remote TCP/IP port forwardings. */
1492: for (i = 0; i < options.num_remote_forwards; i++) {
1.232 djm 1493: debug("Remote connections from %.200s:%d forwarded to "
1494: "local address %.200s:%d",
1.406 millert 1495: (options.remote_forwards[i].listen_path != NULL) ?
1496: options.remote_forwards[i].listen_path :
1.248 djm 1497: (options.remote_forwards[i].listen_host == NULL) ?
1.253 djm 1498: "LOCALHOST" : options.remote_forwards[i].listen_host,
1.232 djm 1499: options.remote_forwards[i].listen_port,
1.406 millert 1500: (options.remote_forwards[i].connect_path != NULL) ?
1501: options.remote_forwards[i].connect_path :
1.232 djm 1502: options.remote_forwards[i].connect_host,
1503: options.remote_forwards[i].connect_port);
1.366 markus 1504: options.remote_forwards[i].handle =
1505: channel_request_remote_forwarding(
1.406 millert 1506: &options.remote_forwards[i]);
1.366 markus 1507: if (options.remote_forwards[i].handle < 0) {
1.283 markus 1508: if (options.exit_on_forward_failure)
1509: fatal("Could not request remote forwarding.");
1510: else
1511: logit("Warning: Could not request remote "
1512: "forwarding.");
1.366 markus 1513: } else {
1514: client_register_global_confirm(ssh_confirm_remote_forward,
1515: &options.remote_forwards[i]);
1.283 markus 1516: }
1.70 markus 1517: }
1.301 djm 1518:
1519: /* Initiate tunnel forwarding. */
1520: if (options.tun_open != SSH_TUNMODE_NO) {
1521: if (client_request_tun_fwd(options.tun_open,
1522: options.tun_local, options.tun_remote) == -1) {
1523: if (options.exit_on_forward_failure)
1524: fatal("Could not request tunnel forwarding.");
1525: else
1526: error("Could not request tunnel forwarding.");
1527: }
1528: }
1.70 markus 1529: }
1530:
1.126 itojun 1531: static void
1.70 markus 1532: check_agent_present(void)
1533: {
1.412 djm 1534: int r;
1535:
1.70 markus 1536: if (options.forward_agent) {
1.254 djm 1537: /* Clear agent forwarding if we don't have an agent. */
1.412 djm 1538: if ((r = ssh_get_authentication_socket(NULL)) != 0) {
1.70 markus 1539: options.forward_agent = 0;
1.412 djm 1540: if (r != SSH_ERR_AGENT_NOT_PRESENT)
1541: debug("ssh_get_authentication_socket: %s",
1542: ssh_err(r));
1543: }
1.70 markus 1544: }
1545: }
1546:
1.126 itojun 1547: static int
1.45 markus 1548: ssh_session(void)
1549: {
1550: int type;
1551: int interactive = 0;
1552: int have_tty = 0;
1553: struct winsize ws;
1554: char *cp;
1.243 djm 1555: const char *display;
1.45 markus 1556:
1.31 markus 1557: /* Enable compression if requested. */
1558: if (options.compression) {
1.316 djm 1559: debug("Requesting compression at level %d.",
1560: options.compression_level);
1.31 markus 1561:
1.316 djm 1562: if (options.compression_level < 1 ||
1563: options.compression_level > 9)
1564: fatal("Compression level must be from 1 (fast) to "
1565: "9 (slow, best).");
1.31 markus 1566:
1567: /* Send the request. */
1568: packet_start(SSH_CMSG_REQUEST_COMPRESSION);
1569: packet_put_int(options.compression_level);
1570: packet_send();
1571: packet_write_wait();
1.156 markus 1572: type = packet_read();
1.31 markus 1573: if (type == SSH_SMSG_SUCCESS)
1574: packet_start_compression(options.compression_level);
1575: else if (type == SSH_SMSG_FAILURE)
1.191 itojun 1576: logit("Warning: Remote host refused compression.");
1.31 markus 1577: else
1.316 djm 1578: packet_disconnect("Protocol error waiting for "
1579: "compression response.");
1.31 markus 1580: }
1581: /* Allocate a pseudo tty if appropriate. */
1582: if (tty_flag) {
1583: debug("Requesting pty.");
1584:
1585: /* Start the packet. */
1586: packet_start(SSH_CMSG_REQUEST_PTY);
1587:
1588: /* Store TERM in the packet. There is no limit on the
1589: length of the string. */
1590: cp = getenv("TERM");
1591: if (!cp)
1592: cp = "";
1.124 markus 1593: packet_put_cstring(cp);
1.31 markus 1594:
1595: /* Store window size in the packet. */
1596: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
1597: memset(&ws, 0, sizeof(ws));
1.269 deraadt 1598: packet_put_int((u_int)ws.ws_row);
1599: packet_put_int((u_int)ws.ws_col);
1600: packet_put_int((u_int)ws.ws_xpixel);
1601: packet_put_int((u_int)ws.ws_ypixel);
1.31 markus 1602:
1603: /* Store tty modes in the packet. */
1.115 stevesk 1604: tty_make_modes(fileno(stdin), NULL);
1.31 markus 1605:
1606: /* Send the packet, and wait for it to leave. */
1607: packet_send();
1608: packet_write_wait();
1609:
1610: /* Read response from the server. */
1.156 markus 1611: type = packet_read();
1.43 markus 1612: if (type == SSH_SMSG_SUCCESS) {
1.31 markus 1613: interactive = 1;
1.45 markus 1614: have_tty = 1;
1.43 markus 1615: } else if (type == SSH_SMSG_FAILURE)
1.316 djm 1616: logit("Warning: Remote host failed or refused to "
1617: "allocate a pseudo tty.");
1.31 markus 1618: else
1.316 djm 1619: packet_disconnect("Protocol error waiting for pty "
1620: "request response.");
1.31 markus 1621: }
1622: /* Request X11 forwarding if enabled and DISPLAY is set. */
1.243 djm 1623: display = getenv("DISPLAY");
1.417 djm 1624: if (display == NULL && options.forward_x11)
1625: debug("X11 forwarding requested but DISPLAY not set");
1.243 djm 1626: if (options.forward_x11 && display != NULL) {
1.150 stevesk 1627: char *proto, *data;
1.50 markus 1628: /* Get reasonable local authentication information. */
1.243 djm 1629: client_x11_get_proto(display, options.xauth_location,
1.384 djm 1630: options.forward_x11_trusted,
1.340 djm 1631: options.forward_x11_timeout,
1632: &proto, &data);
1.50 markus 1633: /* Request forwarding with authentication spoofing. */
1.316 djm 1634: debug("Requesting X11 forwarding with authentication "
1635: "spoofing.");
1.363 djm 1636: x11_request_forwarding_with_spoofing(0, display, proto,
1637: data, 0);
1.31 markus 1638: /* Read response from the server. */
1.156 markus 1639: type = packet_read();
1.31 markus 1640: if (type == SSH_SMSG_SUCCESS) {
1641: interactive = 1;
1.50 markus 1642: } else if (type == SSH_SMSG_FAILURE) {
1.191 itojun 1643: logit("Warning: Remote host denied X11 forwarding.");
1.50 markus 1644: } else {
1.316 djm 1645: packet_disconnect("Protocol error waiting for X11 "
1646: "forwarding");
1.50 markus 1647: }
1.31 markus 1648: }
1649: /* Tell the packet module whether this is an interactive session. */
1.354 djm 1650: packet_set_interactive(interactive,
1651: options.ip_qos_interactive, options.ip_qos_bulk);
1.31 markus 1652:
1653: /* Request authentication agent forwarding if appropriate. */
1.70 markus 1654: check_agent_present();
1655:
1.31 markus 1656: if (options.forward_agent) {
1657: debug("Requesting authentication agent forwarding.");
1658: auth_request_forwarding();
1659:
1660: /* Read response from the server. */
1.156 markus 1661: type = packet_read();
1.155 markus 1662: packet_check_eom();
1.31 markus 1663: if (type != SSH_SMSG_SUCCESS)
1.191 itojun 1664: logit("Warning: Remote host denied authentication agent forwarding.");
1.31 markus 1665: }
1666:
1.70 markus 1667: /* Initiate port forwardings. */
1.368 djm 1668: ssh_init_stdio_forwarding();
1.70 markus 1669: ssh_init_forwarding();
1.305 dtucker 1670:
1671: /* Execute a local command */
1672: if (options.local_command != NULL &&
1673: options.permit_local_command)
1674: ssh_local_cmd(options.local_command);
1.34 markus 1675:
1.318 djm 1676: /*
1677: * If requested and we are not interested in replies to remote
1678: * forwarding requests, then let ssh continue in the background.
1679: */
1.344 djm 1680: if (fork_after_authentication_flag) {
1681: if (options.exit_on_forward_failure &&
1682: options.num_remote_forwards > 0) {
1683: debug("deferring postauth fork until remote forward "
1684: "confirmation received");
1685: } else
1686: fork_postauth();
1.318 djm 1687: }
1.31 markus 1688:
1.33 markus 1689: /*
1690: * If a command was specified on the command line, execute the
1691: * command now. Otherwise request the server to start a shell.
1692: */
1.31 markus 1693: if (buffer_len(&command) > 0) {
1694: int len = buffer_len(&command);
1695: if (len > 900)
1696: len = 900;
1.316 djm 1697: debug("Sending command: %.*s", len,
1698: (u_char *)buffer_ptr(&command));
1.31 markus 1699: packet_start(SSH_CMSG_EXEC_CMD);
1700: packet_put_string(buffer_ptr(&command), buffer_len(&command));
1701: packet_send();
1702: packet_write_wait();
1703: } else {
1704: debug("Requesting shell.");
1705: packet_start(SSH_CMSG_EXEC_SHELL);
1706: packet_send();
1707: packet_write_wait();
1708: }
1709:
1710: /* Enter the interactive session. */
1.119 stevesk 1711: return client_loop(have_tty, tty_flag ?
1712: options.escape_char : SSH_ESCAPECHAR_NONE, 0);
1.89 markus 1713: }
1714:
1.214 djm 1715: /* request pty/x11/agent/tcpfwd/shell for channel */
1716: static void
1.337 djm 1717: ssh_session2_setup(int id, int success, void *arg)
1.214 djm 1718: {
1.215 djm 1719: extern char **environ;
1.243 djm 1720: const char *display;
1721: int interactive = tty_flag;
1.337 djm 1722:
1723: if (!success)
1724: return; /* No need for error message, channels code sens one */
1.215 djm 1725:
1.248 djm 1726: display = getenv("DISPLAY");
1.417 djm 1727: if (display == NULL && options.forward_x11)
1728: debug("X11 forwarding requested but DISPLAY not set");
1.243 djm 1729: if (options.forward_x11 && display != NULL) {
1.150 stevesk 1730: char *proto, *data;
1.50 markus 1731: /* Get reasonable local authentication information. */
1.243 djm 1732: client_x11_get_proto(display, options.xauth_location,
1.340 djm 1733: options.forward_x11_trusted,
1734: options.forward_x11_timeout, &proto, &data);
1.50 markus 1735: /* Request forwarding with authentication spoofing. */
1.316 djm 1736: debug("Requesting X11 forwarding with authentication "
1737: "spoofing.");
1.363 djm 1738: x11_request_forwarding_with_spoofing(id, display, proto,
1739: data, 1);
1740: client_expect_confirm(id, "X11 forwarding", CONFIRM_WARN);
1741: /* XXX exit_on_forward_failure */
1.80 markus 1742: interactive = 1;
1.50 markus 1743: }
1744:
1.70 markus 1745: check_agent_present();
1746: if (options.forward_agent) {
1747: debug("Requesting authentication agent forwarding.");
1748: channel_request_start(id, "auth-agent-req@openssh.com", 0);
1749: packet_send();
1.212 djm 1750: }
1.369 dtucker 1751:
1752: /* Tell the packet module whether this is an interactive session. */
1753: packet_set_interactive(interactive,
1754: options.ip_qos_interactive, options.ip_qos_bulk);
1.212 djm 1755:
1.214 djm 1756: client_session2_setup(id, tty_flag, subsystem_flag, getenv("TERM"),
1.311 djm 1757: NULL, fileno(stdin), &command, environ);
1.45 markus 1758: }
1759:
1.143 markus 1760: /* open new channel for a session */
1.126 itojun 1761: static int
1.143 markus 1762: ssh_session2_open(void)
1.45 markus 1763: {
1.118 markus 1764: Channel *c;
1765: int window, packetmax, in, out, err;
1.60 markus 1766:
1.62 markus 1767: if (stdin_null_flag) {
1.93 itojun 1768: in = open(_PATH_DEVNULL, O_RDONLY);
1.62 markus 1769: } else {
1770: in = dup(STDIN_FILENO);
1771: }
1.60 markus 1772: out = dup(STDOUT_FILENO);
1773: err = dup(STDERR_FILENO);
1.45 markus 1774:
1775: if (in < 0 || out < 0 || err < 0)
1.62 markus 1776: fatal("dup() in/out/err failed");
1.45 markus 1777:
1.69 markus 1778: /* enable nonblocking unless tty */
1779: if (!isatty(in))
1780: set_nonblock(in);
1781: if (!isatty(out))
1782: set_nonblock(out);
1783: if (!isatty(err))
1784: set_nonblock(err);
1785:
1.65 markus 1786: window = CHAN_SES_WINDOW_DEFAULT;
1787: packetmax = CHAN_SES_PACKET_DEFAULT;
1.164 markus 1788: if (tty_flag) {
1789: window >>= 1;
1790: packetmax >>= 1;
1.45 markus 1791: }
1.118 markus 1792: c = channel_new(
1.45 markus 1793: "session", SSH_CHANNEL_OPENING, in, out, err,
1.65 markus 1794: window, packetmax, CHAN_EXTENDED_WRITE,
1.192 markus 1795: "client-session", /*nonblock*/0);
1.45 markus 1796:
1.143 markus 1797: debug3("ssh_session2_open: channel_new: %d", c->self);
1.106 markus 1798:
1.122 markus 1799: channel_send_open(c->self);
1.143 markus 1800: if (!no_shell_flag)
1.310 djm 1801: channel_register_open_confirm(c->self,
1802: ssh_session2_setup, NULL);
1.106 markus 1803:
1.118 markus 1804: return c->self;
1.106 markus 1805: }
1806:
1.126 itojun 1807: static int
1.106 markus 1808: ssh_session2(void)
1809: {
1.143 markus 1810: int id = -1;
1.106 markus 1811:
1812: /* XXX should be pre-session */
1.368 djm 1813: if (!options.control_persist)
1814: ssh_init_stdio_forwarding();
1.106 markus 1815: ssh_init_forwarding();
1816:
1.344 djm 1817: /* Start listening for multiplex clients */
1818: muxserver_listen();
1819:
1820: /*
1.368 djm 1821: * If we are in control persist mode and have a working mux listen
1822: * socket, then prepare to background ourselves and have a foreground
1823: * client attach as a control slave.
1824: * NB. we must save copies of the flags that we override for
1.344 djm 1825: * the backgrounding, since we defer attachment of the slave until
1826: * after the connection is fully established (in particular,
1827: * async rfwd replies have been received for ExitOnForwardFailure).
1828: */
1829: if (options.control_persist && muxserver_sock != -1) {
1830: ostdin_null_flag = stdin_null_flag;
1831: ono_shell_flag = no_shell_flag;
1.359 djm 1832: orequest_tty = options.request_tty;
1.344 djm 1833: otty_flag = tty_flag;
1834: stdin_null_flag = 1;
1835: no_shell_flag = 1;
1836: tty_flag = 0;
1837: if (!fork_after_authentication_flag)
1838: need_controlpersist_detach = 1;
1839: fork_after_authentication_flag = 1;
1840: }
1.368 djm 1841: /*
1842: * ControlPersist mux listen socket setup failed, attempt the
1843: * stdio forward setup that we skipped earlier.
1844: */
1845: if (options.control_persist && muxserver_sock == -1)
1846: ssh_init_stdio_forwarding();
1.344 djm 1847:
1.143 markus 1848: if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN))
1849: id = ssh_session2_open();
1.379 djm 1850: else {
1851: packet_set_interactive(
1852: options.control_master == SSHCTL_MASTER_NO,
1853: options.ip_qos_interactive, options.ip_qos_bulk);
1854: }
1.314 djm 1855:
1856: /* If we don't expect to open a new session, then disallow it */
1.319 markus 1857: if (options.control_master == SSHCTL_MASTER_NO &&
1858: (datafellows & SSH_NEW_OPENSSH)) {
1.314 djm 1859: debug("Requesting no-more-sessions@openssh.com");
1860: packet_start(SSH2_MSG_GLOBAL_REQUEST);
1861: packet_put_cstring("no-more-sessions@openssh.com");
1862: packet_put_char(0);
1863: packet_send();
1864: }
1.255 reyk 1865:
1866: /* Execute a local command */
1867: if (options.local_command != NULL &&
1868: options.permit_local_command)
1869: ssh_local_cmd(options.local_command);
1.301 djm 1870:
1.342 djm 1871: /*
1872: * If requested and we are not interested in replies to remote
1873: * forwarding requests, then let ssh continue in the background.
1874: */
1.344 djm 1875: if (fork_after_authentication_flag) {
1876: if (options.exit_on_forward_failure &&
1877: options.num_remote_forwards > 0) {
1878: debug("deferring postauth fork until remote forward "
1879: "confirmation received");
1880: } else
1881: fork_postauth();
1.318 djm 1882: }
1.327 andreas 1883:
1884: if (options.use_roaming)
1885: request_roaming();
1.31 markus 1886:
1.119 stevesk 1887: return client_loop(tty_flag, tty_flag ?
1888: options.escape_char : SSH_ESCAPECHAR_NONE, id);
1.72 markus 1889: }
1890:
1.126 itojun 1891: static void
1.104 markus 1892: load_public_identity_files(void)
1893: {
1.275 djm 1894: char *filename, *cp, thishost[NI_MAXHOST];
1.306 deraadt 1895: char *pwdir = NULL, *pwname = NULL;
1.167 markus 1896: int i = 0;
1.104 markus 1897: Key *public;
1.275 djm 1898: struct passwd *pw;
1.335 djm 1899: u_int n_ids;
1900: char *identity_files[SSH_MAX_IDENTITY_FILES];
1901: Key *identity_keys[SSH_MAX_IDENTITY_FILES];
1.333 markus 1902: #ifdef ENABLE_PKCS11
1.167 markus 1903: Key **keys;
1.333 markus 1904: int nkeys;
1.335 djm 1905: #endif /* PKCS11 */
1.104 markus 1906:
1.335 djm 1907: n_ids = 0;
1.398 tedu 1908: memset(identity_files, 0, sizeof(identity_files));
1909: memset(identity_keys, 0, sizeof(identity_keys));
1.335 djm 1910:
1911: #ifdef ENABLE_PKCS11
1.333 markus 1912: if (options.pkcs11_provider != NULL &&
1.167 markus 1913: options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
1.333 markus 1914: (pkcs11_init(!options.batch_mode) == 0) &&
1915: (nkeys = pkcs11_add_provider(options.pkcs11_provider, NULL,
1916: &keys)) > 0) {
1917: for (i = 0; i < nkeys; i++) {
1.335 djm 1918: if (n_ids >= SSH_MAX_IDENTITY_FILES) {
1919: key_free(keys[i]);
1920: continue;
1921: }
1922: identity_keys[n_ids] = keys[i];
1923: identity_files[n_ids] =
1.333 markus 1924: xstrdup(options.pkcs11_provider); /* XXX */
1.335 djm 1925: n_ids++;
1.167 markus 1926: }
1.378 djm 1927: free(keys);
1.127 markus 1928: }
1.333 markus 1929: #endif /* ENABLE_PKCS11 */
1.275 djm 1930: if ((pw = getpwuid(original_real_uid)) == NULL)
1931: fatal("load_public_identity_files: getpwuid failed");
1.307 dtucker 1932: pwname = xstrdup(pw->pw_name);
1933: pwdir = xstrdup(pw->pw_dir);
1.275 djm 1934: if (gethostname(thishost, sizeof(thishost)) == -1)
1935: fatal("load_public_identity_files: gethostname: %s",
1936: strerror(errno));
1.335 djm 1937: for (i = 0; i < options.num_identity_files; i++) {
1.373 djm 1938: if (n_ids >= SSH_MAX_IDENTITY_FILES ||
1939: strcasecmp(options.identity_files[i], "none") == 0) {
1.378 djm 1940: free(options.identity_files[i]);
1.335 djm 1941: continue;
1942: }
1.275 djm 1943: cp = tilde_expand_filename(options.identity_files[i],
1.131 millert 1944: original_real_uid);
1.306 deraadt 1945: filename = percent_expand(cp, "d", pwdir,
1946: "u", pwname, "l", thishost, "h", host,
1.275 djm 1947: "r", options.user, (char *)NULL);
1.378 djm 1948: free(cp);
1.131 millert 1949: public = key_load_public(filename, NULL);
1950: debug("identity file %s type %d", filename,
1951: public ? public->type : -1);
1.378 djm 1952: free(options.identity_files[i]);
1.335 djm 1953: identity_files[n_ids] = filename;
1954: identity_keys[n_ids] = public;
1955:
1956: if (++n_ids >= SSH_MAX_IDENTITY_FILES)
1957: continue;
1958:
1959: /* Try to add the certificate variant too */
1960: xasprintf(&cp, "%s-cert", filename);
1961: public = key_load_public(cp, NULL);
1962: debug("identity file %s type %d", cp,
1963: public ? public->type : -1);
1964: if (public == NULL) {
1.378 djm 1965: free(cp);
1.335 djm 1966: continue;
1967: }
1968: if (!key_is_cert(public)) {
1969: debug("%s: key %s type %s is not a certificate",
1970: __func__, cp, key_type(public));
1971: key_free(public);
1.378 djm 1972: free(cp);
1.335 djm 1973: continue;
1974: }
1975: identity_keys[n_ids] = public;
1976: /* point to the original path, most likely the private key */
1977: identity_files[n_ids] = xstrdup(filename);
1978: n_ids++;
1979: }
1980: options.num_identity_files = n_ids;
1981: memcpy(options.identity_files, identity_files, sizeof(identity_files));
1982: memcpy(options.identity_keys, identity_keys, sizeof(identity_keys));
1983:
1.398 tedu 1984: explicit_bzero(pwname, strlen(pwname));
1.378 djm 1985: free(pwname);
1.398 tedu 1986: explicit_bzero(pwdir, strlen(pwdir));
1.378 djm 1987: free(pwdir);
1.214 djm 1988: }
1.352 djm 1989:
1990: static void
1991: main_sigchld_handler(int sig)
1992: {
1993: int save_errno = errno;
1994: pid_t pid;
1995: int status;
1996:
1997: while ((pid = waitpid(-1, &status, WNOHANG)) > 0 ||
1998: (pid < 0 && errno == EINTR))
1999: ;
2000:
2001: signal(sig, main_sigchld_handler);
2002: errno = save_errno;
2003: }
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