Annotation of src/usr.bin/ssh/ssh.c, Revision 1.416
1.416 ! djm 1: /* $OpenBSD: ssh.c,v 1.415 2015/02/20 22:17:21 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"
1.394 deraadt 191: " [-L [bind_address:]port:host:hostport] [-l login_name] [-m mac_spec]\n"
1.395 jmc 192: " [-O ctl_cmd] [-o option] [-p port]\n"
193: " [-Q cipher | cipher-auth | mac | kex | key]\n"
194: " [-R [bind_address:]port:host:hostport] [-S ctl_path] [-W host:port]\n"
195: " [-w local_tun[:remote_tun]] [user@]hostname [command]\n"
1.208 markus 196: );
1.257 dtucker 197: exit(255);
1.1 deraadt 198: }
199:
1.126 itojun 200: static int ssh_session(void);
201: static int ssh_session2(void);
202: static void load_public_identity_files(void);
1.352 djm 203: static void main_sigchld_handler(int);
1.312 djm 204:
205: /* from muxclient.c */
206: void muxclient(const char *);
207: void muxserver_listen(void);
1.45 markus 208:
1.361 djm 209: /* ~/ expand a list of paths. NB. assumes path[n] is heap-allocated. */
210: static void
211: tilde_expand_paths(char **paths, u_int num_paths)
212: {
213: u_int i;
214: char *cp;
215:
216: for (i = 0; i < num_paths; i++) {
217: cp = tilde_expand_filename(paths[i], original_real_uid);
1.378 djm 218: free(paths[i]);
1.361 djm 219: paths[i] = cp;
220: }
221: }
222:
1.400 djm 223: /*
224: * Attempt to resolve a host name / port to a set of addresses and
225: * optionally return any CNAMEs encountered along the way.
226: * Returns NULL on failure.
227: * NB. this function must operate with a options having undefined members.
228: */
1.385 djm 229: static struct addrinfo *
1.400 djm 230: resolve_host(const char *name, int port, int logerr, char *cname, size_t clen)
1.385 djm 231: {
232: char strport[NI_MAXSERV];
233: struct addrinfo hints, *res;
234: int gaierr, loglevel = SYSLOG_LEVEL_DEBUG1;
235:
1.400 djm 236: if (port <= 0)
237: port = default_ssh_port();
238:
1.385 djm 239: snprintf(strport, sizeof strport, "%u", port);
1.398 tedu 240: memset(&hints, 0, sizeof(hints));
1.400 djm 241: hints.ai_family = options.address_family == -1 ?
242: AF_UNSPEC : options.address_family;
1.385 djm 243: hints.ai_socktype = SOCK_STREAM;
244: if (cname != NULL)
245: hints.ai_flags = AI_CANONNAME;
246: if ((gaierr = getaddrinfo(name, strport, &hints, &res)) != 0) {
247: if (logerr || (gaierr != EAI_NONAME && gaierr != EAI_NODATA))
248: loglevel = SYSLOG_LEVEL_ERROR;
249: do_log2(loglevel, "%s: Could not resolve hostname %.100s: %s",
250: __progname, name, ssh_gai_strerror(gaierr));
251: return NULL;
252: }
253: if (cname != NULL && res->ai_canonname != NULL) {
254: if (strlcpy(cname, res->ai_canonname, clen) >= clen) {
255: error("%s: host \"%s\" cname \"%s\" too long (max %lu)",
256: __func__, name, res->ai_canonname, (u_long)clen);
257: if (clen > 0)
258: *cname = '\0';
259: }
260: }
261: return res;
262: }
263:
264: /*
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;
344: if (match_pattern_list(*namep, rule->source_list,
345: strlen(rule->source_list), 1) != 1 ||
346: match_pattern_list(cname, rule->target_list,
347: strlen(rule->target_list), 1) != 1)
348: continue;
1.386 djm 349: verbose("Canonicalized DNS aliased hostname "
1.385 djm 350: "\"%s\" => \"%s\"", *namep, cname);
351: free(*namep);
352: *namep = xstrdup(cname);
353: return 1;
354: }
355: return 0;
356: }
357:
358: /*
359: * Attempt to resolve the supplied hostname after applying the user's
1.387 djm 360: * canonicalization rules. Returns the address list for the host or NULL
361: * if no name was found after canonicalization.
1.400 djm 362: * NB. this function must operate with a options having undefined members.
1.385 djm 363: */
364: static struct addrinfo *
1.400 djm 365: resolve_canonicalize(char **hostp, int port)
1.385 djm 366: {
367: int i, ndots;
1.413 djm 368: char *cp, *fullhost, newname[NI_MAXHOST];
1.385 djm 369: struct addrinfo *addrs;
370:
1.386 djm 371: if (options.canonicalize_hostname == SSH_CANONICALISE_NO)
1.385 djm 372: return NULL;
1.400 djm 373:
1.385 djm 374: /*
1.386 djm 375: * Don't attempt to canonicalize names that will be interpreted by
1.385 djm 376: * a proxy unless the user specifically requests so.
377: */
1.400 djm 378: if (!option_clear_or_none(options.proxy_command) &&
1.386 djm 379: options.canonicalize_hostname != SSH_CANONICALISE_ALWAYS)
1.385 djm 380: return NULL;
1.400 djm 381:
1.413 djm 382: /* Try numeric hostnames first */
383: if ((addrs = resolve_addr(*hostp, port,
384: newname, sizeof(newname))) != NULL) {
385: debug2("%s: hostname %.100s is address", __func__, *hostp);
386: if (strcasecmp(*hostp, newname) != 0) {
387: debug2("%s: canonicalised address \"%s\" => \"%s\"",
388: __func__, *hostp, newname);
389: free(*hostp);
390: *hostp = xstrdup(newname);
391: }
392: return addrs;
393: }
394:
1.387 djm 395: /* Don't apply canonicalization to sufficiently-qualified hostnames */
1.385 djm 396: ndots = 0;
397: for (cp = *hostp; *cp != '\0'; cp++) {
398: if (*cp == '.')
399: ndots++;
400: }
1.386 djm 401: if (ndots > options.canonicalize_max_dots) {
402: debug3("%s: not canonicalizing hostname \"%s\" (max dots %d)",
403: __func__, *hostp, options.canonicalize_max_dots);
1.385 djm 404: return NULL;
405: }
406: /* Attempt each supplied suffix */
407: for (i = 0; i < options.num_canonical_domains; i++) {
1.413 djm 408: *newname = '\0';
1.385 djm 409: xasprintf(&fullhost, "%s.%s.", *hostp,
410: options.canonical_domains[i]);
1.400 djm 411: debug3("%s: attempting \"%s\" => \"%s\"", __func__,
412: *hostp, fullhost);
413: if ((addrs = resolve_host(fullhost, port, 0,
1.413 djm 414: newname, sizeof(newname))) == NULL) {
1.385 djm 415: free(fullhost);
416: continue;
417: }
418: /* Remove trailing '.' */
419: fullhost[strlen(fullhost) - 1] = '\0';
420: /* Follow CNAME if requested */
1.413 djm 421: if (!check_follow_cname(&fullhost, newname)) {
1.386 djm 422: debug("Canonicalized hostname \"%s\" => \"%s\"",
1.385 djm 423: *hostp, fullhost);
424: }
425: free(*hostp);
426: *hostp = fullhost;
427: return addrs;
428: }
1.386 djm 429: if (!options.canonicalize_fallback_local)
1.400 djm 430: fatal("%s: Could not resolve host \"%s\"", __progname, *hostp);
431: debug2("%s: host %s not found in any suffix", __func__, *hostp);
1.385 djm 432: return NULL;
433: }
434:
1.32 deraadt 435: /*
1.400 djm 436: * Read per-user configuration file. Ignore the system wide config
437: * file if the user specifies a config file on the command line.
438: */
439: static void
1.408 djm 440: process_config_files(const char *host_arg, struct passwd *pw, int post_canon)
1.400 djm 441: {
1.414 deraadt 442: char buf[PATH_MAX];
1.400 djm 443: int r;
444:
445: if (config != NULL) {
446: if (strcasecmp(config, "none") != 0 &&
1.408 djm 447: !read_config_file(config, pw, host, host_arg, &options,
448: SSHCONF_USERCONF | (post_canon ? SSHCONF_POSTCANON : 0)))
1.400 djm 449: fatal("Can't open user config file %.100s: "
450: "%.100s", config, strerror(errno));
451: } else {
452: r = snprintf(buf, sizeof buf, "%s/%s", pw->pw_dir,
453: _PATH_SSH_USER_CONFFILE);
454: if (r > 0 && (size_t)r < sizeof(buf))
1.408 djm 455: (void)read_config_file(buf, pw, host, host_arg,
456: &options, SSHCONF_CHECKPERM | SSHCONF_USERCONF |
457: (post_canon ? SSHCONF_POSTCANON : 0));
1.400 djm 458:
459: /* Read systemwide configuration file after user config. */
1.408 djm 460: (void)read_config_file(_PATH_HOST_CONFIG_FILE, pw,
461: host, host_arg, &options,
462: post_canon ? SSHCONF_POSTCANON : 0);
463: }
464: }
465:
466: /* Rewrite the port number in an addrinfo list of addresses */
467: static void
468: set_addrinfo_port(struct addrinfo *addrs, int port)
469: {
470: struct addrinfo *addr;
471:
472: for (addr = addrs; addr != NULL; addr = addr->ai_next) {
473: switch (addr->ai_family) {
474: case AF_INET:
475: ((struct sockaddr_in *)addr->ai_addr)->
476: sin_port = htons(port);
477: break;
478: case AF_INET6:
479: ((struct sockaddr_in6 *)addr->ai_addr)->
480: sin6_port = htons(port);
481: break;
482: }
1.400 djm 483: }
484: }
485:
486: /*
1.32 deraadt 487: * Main program for the ssh client.
488: */
1.2 provos 489: int
490: main(int ac, char **av)
1.1 deraadt 491: {
1.408 djm 492: int i, r, opt, exit_status, use_syslog, config_test = 0;
1.414 deraadt 493: char *p, *cp, *line, *argv0, buf[PATH_MAX], *host_arg, *logfile;
1.358 djm 494: char thishost[NI_MAXHOST], shorthost[NI_MAXHOST], portstr[NI_MAXSERV];
1.385 djm 495: char cname[NI_MAXHOST];
1.31 markus 496: struct stat st;
1.98 markus 497: struct passwd *pw;
1.382 djm 498: int timeout_ms;
1.144 stevesk 499: extern int optind, optreset;
500: extern char *optarg;
1.406 millert 501: struct Forward fwd;
1.385 djm 502: struct addrinfo *addrs = NULL;
1.405 djm 503: struct ssh_digest_ctx *md;
504: u_char conn_hash[SSH_DIGEST_MAX_LENGTH];
505: char *conn_hash_hex;
1.250 djm 506:
507: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
508: sanitise_stdfd();
1.31 markus 509:
1.33 markus 510: /*
1.346 djm 511: * Discard other fds that are hanging around. These can cause problem
512: * with backgrounded ssh processes started by ControlPersist.
513: */
514: closefrom(STDERR_FILENO + 1);
515:
516: /*
1.33 markus 517: * Save the original real uid. It will be needed later (uid-swapping
518: * may clobber the real uid).
519: */
1.31 markus 520: original_real_uid = getuid();
521: original_effective_uid = geteuid();
522:
1.184 stevesk 523: /*
524: * Use uid-swapping to give up root privileges for the duration of
525: * option processing. We will re-instantiate the rights when we are
526: * ready to create the privileged port, and will permanently drop
527: * them when the port has been created (actually, when the connection
528: * has been made, as we may need to create the port several times).
529: */
530: PRIV_END;
531:
1.31 markus 532: /* If we are installed setuid root be careful to not drop core. */
533: if (original_real_uid != original_effective_uid) {
534: struct rlimit rlim;
535: rlim.rlim_cur = rlim.rlim_max = 0;
536: if (setrlimit(RLIMIT_CORE, &rlim) < 0)
537: fatal("setrlimit failed: %.100s", strerror(errno));
1.1 deraadt 538: }
1.107 markus 539: /* Get user data. */
540: pw = getpwuid(original_real_uid);
541: if (!pw) {
1.380 djm 542: logit("No user exists for uid %lu", (u_long)original_real_uid);
1.257 dtucker 543: exit(255);
1.107 markus 544: }
545: /* Take a copy of the returned structure. */
546: pw = pwcopy(pw);
1.31 markus 547:
1.33 markus 548: /*
549: * Set our umask to something reasonable, as some files are created
550: * with the default umask. This will make them world-readable but
551: * writable only by the owner, which is ok for all files for which we
552: * don't set the modes explicitly.
553: */
1.31 markus 554: umask(022);
555:
1.316 djm 556: /*
557: * Initialize option structure to indicate that no values have been
558: * set.
559: */
1.31 markus 560: initialize_options(&options);
561:
562: /* Parse command-line arguments. */
563: host = NULL;
1.320 djm 564: use_syslog = 0;
1.375 dtucker 565: logfile = NULL;
1.325 markus 566: argv0 = av[0];
1.31 markus 567:
1.266 djm 568: again:
1.316 djm 569: while ((opt = getopt(ac, av, "1246ab:c:e:fgi:kl:m:no:p:qstvx"
1.408 djm 570: "ACD:E:F:GI:KL:MNO:PQ:R:S:TVw:W:XYy")) != -1) {
1.31 markus 571: switch (opt) {
1.91 jakob 572: case '1':
573: options.protocol = SSH_PROTO_1;
574: break;
1.47 markus 575: case '2':
576: options.protocol = SSH_PROTO_2;
577: break;
1.37 markus 578: case '4':
1.196 djm 579: options.address_family = AF_INET;
1.37 markus 580: break;
581: case '6':
1.196 djm 582: options.address_family = AF_INET6;
1.37 markus 583: break;
1.31 markus 584: case 'n':
585: stdin_null_flag = 1;
586: break;
587: case 'f':
588: fork_after_authentication_flag = 1;
589: stdin_null_flag = 1;
590: break;
591: case 'x':
592: options.forward_x11 = 0;
593: break;
594: case 'X':
595: options.forward_x11 = 1;
596: break;
1.320 djm 597: case 'y':
598: use_syslog = 1;
599: break;
1.375 dtucker 600: case 'E':
601: logfile = xstrdup(optarg);
602: break;
1.408 djm 603: case 'G':
604: config_test = 1;
605: break;
1.202 markus 606: case 'Y':
607: options.forward_x11 = 1;
608: options.forward_x11_trusted = 1;
609: break;
1.31 markus 610: case 'g':
1.406 millert 611: options.fwd_opts.gateway_ports = 1;
1.31 markus 612: break;
1.229 djm 613: case 'O':
1.332 djm 614: if (stdio_forward_host != NULL)
615: fatal("Cannot specify multiplexing "
616: "command with -W");
617: else if (muxclient_command != 0)
618: fatal("Multiplexing command already specified");
1.229 djm 619: if (strcmp(optarg, "check") == 0)
1.312 djm 620: muxclient_command = SSHMUX_COMMAND_ALIVE_CHECK;
1.338 markus 621: else if (strcmp(optarg, "forward") == 0)
622: muxclient_command = SSHMUX_COMMAND_FORWARD;
1.229 djm 623: else if (strcmp(optarg, "exit") == 0)
1.312 djm 624: muxclient_command = SSHMUX_COMMAND_TERMINATE;
1.357 djm 625: else if (strcmp(optarg, "stop") == 0)
626: muxclient_command = SSHMUX_COMMAND_STOP;
1.365 djm 627: else if (strcmp(optarg, "cancel") == 0)
628: muxclient_command = SSHMUX_COMMAND_CANCEL_FWD;
1.229 djm 629: else
630: fatal("Invalid multiplex command.");
631: break;
1.183 stevesk 632: case 'P': /* deprecated */
1.31 markus 633: options.use_privileged_port = 0;
1.376 djm 634: break;
1.394 deraadt 635: case 'Q':
1.376 djm 636: cp = NULL;
1.394 deraadt 637: if (strcmp(optarg, "cipher") == 0)
1.393 djm 638: cp = cipher_alg_list('\n', 0);
1.394 deraadt 639: else if (strcmp(optarg, "cipher-auth") == 0)
1.393 djm 640: cp = cipher_alg_list('\n', 1);
1.394 deraadt 641: else if (strcmp(optarg, "mac") == 0)
1.392 dtucker 642: cp = mac_alg_list('\n');
1.394 deraadt 643: else if (strcmp(optarg, "kex") == 0)
1.392 dtucker 644: cp = kex_alg_list('\n');
1.394 deraadt 645: else if (strcmp(optarg, "key") == 0)
1.396 markus 646: cp = key_alg_list(0, 0);
647: else if (strcmp(optarg, "key-cert") == 0)
648: cp = key_alg_list(1, 0);
649: else if (strcmp(optarg, "key-plain") == 0)
650: cp = key_alg_list(0, 1);
1.416 ! djm 651: else if (strcmp(optarg, "protocol-version") == 0) {
! 652: #ifdef WITH_SSH1
! 653: cp = xstrdup("1\n2");
! 654: #else
! 655: cp = xstrdup("2");
! 656: #endif
! 657: }
1.376 djm 658: if (cp == NULL)
659: fatal("Unsupported query \"%s\"", optarg);
660: printf("%s\n", cp);
661: free(cp);
662: exit(0);
1.31 markus 663: break;
664: case 'a':
665: options.forward_agent = 0;
1.53 markus 666: break;
667: case 'A':
668: options.forward_agent = 1;
1.31 markus 669: break;
670: case 'k':
1.204 dtucker 671: options.gss_deleg_creds = 0;
1.297 djm 672: break;
673: case 'K':
674: options.gss_authentication = 1;
675: options.gss_deleg_creds = 1;
1.31 markus 676: break;
677: case 'i':
678: if (stat(optarg, &st) < 0) {
1.128 fgsch 679: fprintf(stderr, "Warning: Identity file %s "
1.231 otto 680: "not accessible: %s.\n", optarg,
681: strerror(errno));
1.31 markus 682: break;
683: }
1.371 dtucker 684: add_identity_file(&options, NULL, optarg, 1);
1.31 markus 685: break;
1.127 markus 686: case 'I':
1.333 markus 687: #ifdef ENABLE_PKCS11
688: options.pkcs11_provider = xstrdup(optarg);
1.137 jakob 689: #else
1.333 markus 690: fprintf(stderr, "no support for PKCS#11.\n");
1.137 jakob 691: #endif
1.127 markus 692: break;
1.31 markus 693: case 't':
1.359 djm 694: if (options.request_tty == REQUEST_TTY_YES)
695: options.request_tty = REQUEST_TTY_FORCE;
696: else
697: options.request_tty = REQUEST_TTY_YES;
1.31 markus 698: break;
699: case 'v':
1.197 markus 700: if (debug_flag == 0) {
1.66 markus 701: debug_flag = 1;
702: options.log_level = SYSLOG_LEVEL_DEBUG1;
1.197 markus 703: } else {
704: if (options.log_level < SYSLOG_LEVEL_DEBUG3)
705: options.log_level++;
706: }
1.375 dtucker 707: break;
1.31 markus 708: case 'V':
1.209 markus 709: fprintf(stderr, "%s, %s\n",
1.402 markus 710: SSH_VERSION,
711: #ifdef WITH_OPENSSL
712: SSLeay_version(SSLEAY_VERSION)
713: #else
714: "without OpenSSL"
715: #endif
716: );
1.31 markus 717: if (opt == 'V')
718: exit(0);
719: break;
1.255 reyk 720: case 'w':
1.256 reyk 721: if (options.tun_open == -1)
722: options.tun_open = SSH_TUNMODE_DEFAULT;
1.255 reyk 723: options.tun_local = a2tun(optarg, &options.tun_remote);
1.256 reyk 724: if (options.tun_local == SSH_TUNID_ERR) {
1.316 djm 725: fprintf(stderr,
726: "Bad tun device '%s'\n", optarg);
1.257 dtucker 727: exit(255);
1.255 reyk 728: }
729: break;
1.331 dtucker 730: case 'W':
1.332 djm 731: if (stdio_forward_host != NULL)
732: fatal("stdio forward already specified");
733: if (muxclient_command != 0)
734: fatal("Cannot specify stdio forward with -O");
1.331 dtucker 735: if (parse_forward(&fwd, optarg, 1, 0)) {
736: stdio_forward_host = fwd.listen_host;
737: stdio_forward_port = fwd.listen_port;
1.378 djm 738: free(fwd.connect_host);
1.331 dtucker 739: } else {
740: fprintf(stderr,
741: "Bad stdio forwarding specification '%s'\n",
742: optarg);
743: exit(255);
744: }
1.359 djm 745: options.request_tty = REQUEST_TTY_NO;
1.331 dtucker 746: no_shell_flag = 1;
747: options.clear_forwardings = 1;
748: options.exit_on_forward_failure = 1;
749: break;
1.31 markus 750: case 'q':
751: options.log_level = SYSLOG_LEVEL_QUIET;
752: break;
753: case 'e':
754: if (optarg[0] == '^' && optarg[2] == 0 &&
1.128 fgsch 755: (u_char) optarg[1] >= 64 &&
756: (u_char) optarg[1] < 128)
1.78 markus 757: options.escape_char = (u_char) optarg[1] & 31;
1.31 markus 758: else if (strlen(optarg) == 1)
1.78 markus 759: options.escape_char = (u_char) optarg[0];
1.31 markus 760: else if (strcmp(optarg, "none") == 0)
1.119 stevesk 761: options.escape_char = SSH_ESCAPECHAR_NONE;
1.31 markus 762: else {
1.128 fgsch 763: fprintf(stderr, "Bad escape character '%s'.\n",
764: optarg);
1.257 dtucker 765: exit(255);
1.31 markus 766: }
767: break;
768: case 'c':
1.49 markus 769: if (ciphers_valid(optarg)) {
770: /* SSH2 only */
771: options.ciphers = xstrdup(optarg);
1.224 markus 772: options.cipher = SSH_CIPHER_INVALID;
1.49 markus 773: } else {
774: /* SSH1 only */
1.74 markus 775: options.cipher = cipher_number(optarg);
776: if (options.cipher == -1) {
1.128 fgsch 777: fprintf(stderr,
778: "Unknown cipher type '%s'\n",
779: optarg);
1.257 dtucker 780: exit(255);
1.49 markus 781: }
1.128 fgsch 782: if (options.cipher == SSH_CIPHER_3DES)
1.74 markus 783: options.ciphers = "3des-cbc";
1.128 fgsch 784: else if (options.cipher == SSH_CIPHER_BLOWFISH)
1.74 markus 785: options.ciphers = "blowfish-cbc";
1.128 fgsch 786: else
1.74 markus 787: options.ciphers = (char *)-1;
1.95 markus 788: }
789: break;
790: case 'm':
791: if (mac_valid(optarg))
792: options.macs = xstrdup(optarg);
793: else {
1.128 fgsch 794: fprintf(stderr, "Unknown mac type '%s'\n",
795: optarg);
1.257 dtucker 796: exit(255);
1.31 markus 797: }
798: break;
1.214 djm 799: case 'M':
1.242 djm 800: if (options.control_master == SSHCTL_MASTER_YES)
801: options.control_master = SSHCTL_MASTER_ASK;
802: else
803: options.control_master = SSHCTL_MASTER_YES;
1.214 djm 804: break;
1.31 markus 805: case 'p':
1.113 stevesk 806: options.port = a2port(optarg);
1.323 djm 807: if (options.port <= 0) {
1.109 markus 808: fprintf(stderr, "Bad port '%s'\n", optarg);
1.257 dtucker 809: exit(255);
1.109 markus 810: }
1.31 markus 811: break;
812: case 'l':
813: options.user = optarg;
814: break;
1.141 stevesk 815:
816: case 'L':
1.324 djm 817: if (parse_forward(&fwd, optarg, 0, 0))
1.232 djm 818: add_local_forward(&options, &fwd);
819: else {
1.128 fgsch 820: fprintf(stderr,
1.232 djm 821: "Bad local forwarding specification '%s'\n",
1.128 fgsch 822: optarg);
1.257 dtucker 823: exit(255);
1.31 markus 824: }
1.232 djm 825: break;
826:
827: case 'R':
1.324 djm 828: if (parse_forward(&fwd, optarg, 0, 1)) {
1.232 djm 829: add_remote_forward(&options, &fwd);
830: } else {
1.128 fgsch 831: fprintf(stderr,
1.232 djm 832: "Bad remote forwarding specification "
833: "'%s'\n", optarg);
1.257 dtucker 834: exit(255);
1.31 markus 835: }
836: break;
1.108 markus 837:
838: case 'D':
1.324 djm 839: if (parse_forward(&fwd, optarg, 1, 0)) {
1.322 stevesk 840: add_local_forward(&options, &fwd);
1.232 djm 841: } else {
1.322 stevesk 842: fprintf(stderr,
843: "Bad dynamic forwarding specification "
844: "'%s'\n", optarg);
1.257 dtucker 845: exit(255);
1.109 markus 846: }
1.108 markus 847: break;
848:
1.31 markus 849: case 'C':
850: options.compression = 1;
851: break;
1.45 markus 852: case 'N':
853: no_shell_flag = 1;
1.359 djm 854: options.request_tty = REQUEST_TTY_NO;
1.45 markus 855: break;
856: case 'T':
1.359 djm 857: options.request_tty = REQUEST_TTY_NO;
1.45 markus 858: break;
1.31 markus 859: case 'o':
1.205 markus 860: line = xstrdup(optarg);
1.408 djm 861: if (process_config_line(&options, pw,
862: host ? host : "", host ? host : "", line,
863: "command-line", 0, NULL, SSHCONF_USERCONF) != 0)
1.257 dtucker 864: exit(255);
1.378 djm 865: free(line);
1.31 markus 866: break;
1.85 djm 867: case 's':
868: subsystem_flag = 1;
1.117 markus 869: break;
1.214 djm 870: case 'S':
871: if (options.control_path != NULL)
872: free(options.control_path);
873: options.control_path = xstrdup(optarg);
874: break;
1.117 markus 875: case 'b':
876: options.bind_address = optarg;
1.85 djm 877: break;
1.139 markus 878: case 'F':
879: config = optarg;
880: break;
1.31 markus 881: default:
882: usage();
1.1 deraadt 883: }
1.31 markus 884: }
885:
1.128 fgsch 886: ac -= optind;
887: av += optind;
888:
1.329 guenther 889: if (ac > 0 && !host) {
1.188 markus 890: if (strrchr(*av, '@')) {
1.128 fgsch 891: p = xstrdup(*av);
1.188 markus 892: cp = strrchr(p, '@');
1.128 fgsch 893: if (cp == NULL || cp == p)
894: usage();
895: options.user = p;
896: *cp = '\0';
1.385 djm 897: host = xstrdup(++cp);
1.128 fgsch 898: } else
1.385 djm 899: host = xstrdup(*av);
1.189 millert 900: if (ac > 1) {
901: optind = optreset = 1;
1.128 fgsch 902: goto again;
903: }
1.189 millert 904: ac--, av++;
1.128 fgsch 905: }
906:
1.31 markus 907: /* Check that we got a host name. */
908: if (!host)
909: usage();
910:
1.385 djm 911: host_arg = xstrdup(host);
912:
1.402 markus 913: #ifdef WITH_OPENSSL
1.350 djm 914: OpenSSL_add_all_algorithms();
1.72 markus 915: ERR_load_crypto_strings();
1.402 markus 916: #endif
1.31 markus 917:
918: /* Initialize the command to execute on remote host. */
919: buffer_init(&command);
1.1 deraadt 920:
1.33 markus 921: /*
922: * Save the command to execute on the remote host in a buffer. There
923: * is no limit on the length of the command, except by the maximum
924: * packet size. Also sets the tty flag if there is no command.
925: */
1.128 fgsch 926: if (!ac) {
1.31 markus 927: /* No command specified - execute shell on a tty. */
1.85 djm 928: if (subsystem_flag) {
1.128 fgsch 929: fprintf(stderr,
930: "You must specify a subsystem to invoke.\n");
1.85 djm 931: usage();
932: }
1.31 markus 933: } else {
1.128 fgsch 934: /* A command has been specified. Store it into the buffer. */
935: for (i = 0; i < ac; i++) {
936: if (i)
1.31 markus 937: buffer_append(&command, " ", 1);
938: buffer_append(&command, av[i], strlen(av[i]));
939: }
940: }
941:
942: /* Cannot fork to background if no command. */
1.316 djm 943: if (fork_after_authentication_flag && buffer_len(&command) == 0 &&
944: !no_shell_flag)
945: fatal("Cannot fork into background without a command "
946: "to execute.");
1.31 markus 947:
1.101 markus 948: /*
949: * Initialize "log" output. Since we are the client all output
1.375 dtucker 950: * goes to stderr unless otherwise specified by -y or -E.
1.101 markus 951: */
1.375 dtucker 952: if (use_syslog && logfile != NULL)
953: fatal("Can't specify both -y and -E");
954: if (logfile != NULL) {
955: log_redirect_stderr_to(logfile);
1.378 djm 956: free(logfile);
1.375 dtucker 957: }
1.325 markus 958: log_init(argv0,
1.316 djm 959: options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level,
1.320 djm 960: SYSLOG_FACILITY_USER, !use_syslog);
1.375 dtucker 961:
962: if (debug_flag)
1.402 markus 963: logit("%s, %s", SSH_VERSION,
964: #ifdef WITH_OPENSSL
965: SSLeay_version(SSLEAY_VERSION)
966: #else
967: "without OpenSSL"
968: #endif
969: );
1.31 markus 970:
1.400 djm 971: /* Parse the configuration files */
1.408 djm 972: process_config_files(host_arg, pw, 0);
1.400 djm 973:
974: /* Hostname canonicalisation needs a few options filled. */
975: fill_default_options_for_canonicalization(&options);
976:
977: /* If the user has replaced the hostname then take it into use now */
978: if (options.hostname != NULL) {
979: /* NB. Please keep in sync with readconf.c:match_cfg_line() */
980: cp = percent_expand(options.hostname,
981: "h", host, (char *)NULL);
982: free(host);
983: host = cp;
1.408 djm 984: free(options.hostname);
985: options.hostname = xstrdup(host);
1.400 djm 986: }
987:
988: /* If canonicalization requested then try to apply it */
989: lowercase(host);
990: if (options.canonicalize_hostname != SSH_CANONICALISE_NO)
991: addrs = resolve_canonicalize(&host, options.port);
992:
1.139 markus 993: /*
1.401 djm 994: * If CanonicalizePermittedCNAMEs have been specified but
995: * other canonicalization did not happen (by not being requested
996: * or by failing with fallback) then the hostname may still be changed
997: * as a result of CNAME following.
998: *
999: * Try to resolve the bare hostname name using the system resolver's
1000: * usual search rules and then apply the CNAME follow rules.
1001: *
1002: * Skip the lookup if a ProxyCommand is being used unless the user
1003: * has specifically requested canonicalisation for this case via
1004: * CanonicalizeHostname=always
1.139 markus 1005: */
1.401 djm 1006: if (addrs == NULL && options.num_permitted_cnames != 0 &&
1007: (option_clear_or_none(options.proxy_command) ||
1.400 djm 1008: options.canonicalize_hostname == SSH_CANONICALISE_ALWAYS)) {
1.403 djm 1009: if ((addrs = resolve_host(host, options.port,
1010: option_clear_or_none(options.proxy_command),
1011: cname, sizeof(cname))) == NULL) {
1012: /* Don't fatal proxied host names not in the DNS */
1013: if (option_clear_or_none(options.proxy_command))
1014: cleanup_exit(255); /* logged in resolve_host */
1015: } else
1016: check_follow_cname(&host, cname);
1.400 djm 1017: }
1.139 markus 1018:
1.400 djm 1019: /*
1.408 djm 1020: * If canonicalisation is enabled then re-parse the configuration
1021: * files as new stanzas may match.
1.400 djm 1022: */
1.408 djm 1023: if (options.canonicalize_hostname != 0) {
1024: debug("Re-reading configuration after hostname "
1025: "canonicalisation");
1026: free(options.hostname);
1027: options.hostname = xstrdup(host);
1028: process_config_files(host_arg, pw, 1);
1029: /*
1030: * Address resolution happens early with canonicalisation
1031: * enabled and the port number may have changed since, so
1032: * reset it in address list
1033: */
1034: if (addrs != NULL && options.port > 0)
1035: set_addrinfo_port(addrs, options.port);
1.139 markus 1036: }
1.31 markus 1037:
1038: /* Fill configuration defaults. */
1039: fill_default_options(&options);
1040:
1.400 djm 1041: if (options.port == 0)
1042: options.port = default_ssh_port();
1.196 djm 1043: channel_set_af(options.address_family);
1044:
1.383 djm 1045: /* Tidy and check options */
1046: if (options.host_key_alias != NULL)
1047: lowercase(options.host_key_alias);
1048: if (options.proxy_command != NULL &&
1049: strcmp(options.proxy_command, "-") == 0 &&
1050: options.proxy_use_fdpass)
1051: fatal("ProxyCommand=- and ProxyUseFDPass are incompatible");
1.415 djm 1052: if (options.control_persist &&
1053: options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK) {
1054: debug("UpdateHostKeys=ask is incompatible with ControlPersist; "
1055: "disabling");
1056: options.update_hostkeys = 0;
1057: }
1.388 djm 1058: if (original_effective_uid != 0)
1059: options.use_privileged_port = 0;
1.383 djm 1060:
1.31 markus 1061: /* reinit */
1.325 markus 1062: log_init(argv0, options.log_level, SYSLOG_FACILITY_USER, !use_syslog);
1.370 djm 1063:
1064: if (options.request_tty == REQUEST_TTY_YES ||
1065: options.request_tty == REQUEST_TTY_FORCE)
1066: tty_flag = 1;
1067:
1068: /* Allocate a tty by default if no command specified. */
1069: if (buffer_len(&command) == 0)
1070: tty_flag = options.request_tty != REQUEST_TTY_NO;
1071:
1072: /* Force no tty */
1073: if (options.request_tty == REQUEST_TTY_NO || muxclient_command != 0)
1074: tty_flag = 0;
1075: /* Do not allocate a tty if stdin is not a tty. */
1076: if ((!isatty(fileno(stdin)) || stdin_null_flag) &&
1077: options.request_tty != REQUEST_TTY_FORCE) {
1078: if (tty_flag)
1079: logit("Pseudo-terminal will not be allocated because "
1080: "stdin is not a terminal.");
1081: tty_flag = 0;
1082: }
1.31 markus 1083:
1084: if (options.user == NULL)
1085: options.user = xstrdup(pw->pw_name);
1.343 djm 1086:
1.358 djm 1087: if (gethostname(thishost, sizeof(thishost)) == -1)
1088: fatal("gethostname: %s", strerror(errno));
1089: strlcpy(shorthost, thishost, sizeof(shorthost));
1090: shorthost[strcspn(thishost, ".")] = '\0';
1091: snprintf(portstr, sizeof(portstr), "%d", options.port);
1092:
1.405 djm 1093: if ((md = ssh_digest_start(SSH_DIGEST_SHA1)) == NULL ||
1094: ssh_digest_update(md, thishost, strlen(thishost)) < 0 ||
1095: ssh_digest_update(md, host, strlen(host)) < 0 ||
1096: ssh_digest_update(md, portstr, strlen(portstr)) < 0 ||
1097: ssh_digest_update(md, options.user, strlen(options.user)) < 0 ||
1098: ssh_digest_final(md, conn_hash, sizeof(conn_hash)) < 0)
1099: fatal("%s: mux digest failed", __func__);
1100: ssh_digest_free(md);
1101: conn_hash_hex = tohex(conn_hash, ssh_digest_bytes(SSH_DIGEST_SHA1));
1102:
1.317 dtucker 1103: if (options.local_command != NULL) {
1104: debug3("expanding LocalCommand: %s", options.local_command);
1105: cp = options.local_command;
1.405 djm 1106: options.local_command = percent_expand(cp,
1107: "C", conn_hash_hex,
1108: "L", shorthost,
1109: "d", pw->pw_dir,
1110: "h", host,
1111: "l", thishost,
1112: "n", host_arg,
1113: "p", portstr,
1114: "r", options.user,
1115: "u", pw->pw_name,
1.358 djm 1116: (char *)NULL);
1.317 dtucker 1117: debug3("expanded LocalCommand: %s", options.local_command);
1.378 djm 1118: free(cp);
1.304 dtucker 1119: }
1.31 markus 1120:
1.214 djm 1121: if (options.control_path != NULL) {
1.241 djm 1122: cp = tilde_expand_filename(options.control_path,
1123: original_real_uid);
1.378 djm 1124: free(options.control_path);
1.405 djm 1125: options.control_path = percent_expand(cp,
1126: "C", conn_hash_hex,
1127: "L", shorthost,
1128: "h", host,
1129: "l", thishost,
1130: "n", host_arg,
1131: "p", portstr,
1132: "r", options.user,
1133: "u", pw->pw_name,
1.358 djm 1134: (char *)NULL);
1.378 djm 1135: free(cp);
1.214 djm 1136: }
1.405 djm 1137: free(conn_hash_hex);
1.408 djm 1138:
1139: if (config_test) {
1140: dump_client_config(&options, host);
1141: exit(0);
1142: }
1.405 djm 1143:
1.312 djm 1144: if (muxclient_command != 0 && options.control_path == NULL)
1.240 djm 1145: fatal("No ControlPath specified for \"-O\" command");
1.242 djm 1146: if (options.control_path != NULL)
1.312 djm 1147: muxclient(options.control_path);
1.401 djm 1148:
1149: /*
1150: * If hostname canonicalisation was not enabled, then we may not
1151: * have yet resolved the hostname. Do so now.
1152: */
1153: if (addrs == NULL && options.proxy_command == NULL) {
1154: if ((addrs = resolve_host(host, options.port, 1,
1155: cname, sizeof(cname))) == NULL)
1156: cleanup_exit(255); /* resolve_host logs the error */
1157: }
1.214 djm 1158:
1.303 djm 1159: timeout_ms = options.connection_timeout * 1000;
1160:
1.77 markus 1161: /* Open a connection to the remote host. */
1.385 djm 1162: if (ssh_connect(host, addrs, &hostaddr, options.port,
1163: options.address_family, options.connection_attempts,
1164: &timeout_ms, options.tcp_keep_alive,
1.388 djm 1165: options.use_privileged_port) != 0)
1.257 dtucker 1166: exit(255);
1.31 markus 1167:
1.391 djm 1168: if (addrs != NULL)
1169: freeaddrinfo(addrs);
1170:
1.385 djm 1171: packet_set_timeout(options.server_alive_interval,
1172: options.server_alive_count_max);
1173:
1.303 djm 1174: if (timeout_ms > 0)
1175: debug3("timeout: %d ms remain after connect", timeout_ms);
1176:
1.33 markus 1177: /*
1178: * If we successfully made the connection, load the host private key
1179: * in case we will need it later for combined rsa-rhosts
1180: * authentication. This must be done before releasing extra
1181: * privileges, because the file is only readable by root.
1.174 markus 1182: * If we cannot access the private keys, load the public keys
1183: * instead and try to execute the ssh-keysign helper instead.
1.33 markus 1184: */
1.112 markus 1185: sensitive_data.nkeys = 0;
1186: sensitive_data.keys = NULL;
1.173 markus 1187: sensitive_data.external_keysign = 0;
1.178 markus 1188: if (options.rhosts_rsa_authentication ||
1189: options.hostbased_authentication) {
1.397 djm 1190: sensitive_data.nkeys = 9;
1.274 deraadt 1191: sensitive_data.keys = xcalloc(sensitive_data.nkeys,
1.180 deraadt 1192: sizeof(Key));
1.177 markus 1193:
1194: PRIV_START;
1.112 markus 1195: sensitive_data.keys[0] = key_load_private_type(KEY_RSA1,
1.276 dtucker 1196: _PATH_HOST_KEY_FILE, "", NULL, NULL);
1.411 djm 1197: sensitive_data.keys[1] = key_load_private_cert(KEY_ECDSA,
1.349 djm 1198: _PATH_HOST_ECDSA_KEY_FILE, "", NULL);
1.411 djm 1199: sensitive_data.keys[2] = key_load_private_cert(KEY_ED25519,
1200: _PATH_HOST_ED25519_KEY_FILE, "", NULL);
1.349 djm 1201: sensitive_data.keys[3] = key_load_private_cert(KEY_RSA,
1.345 djm 1202: _PATH_HOST_RSA_KEY_FILE, "", NULL);
1.411 djm 1203: sensitive_data.keys[4] = key_load_private_cert(KEY_DSA,
1204: _PATH_HOST_DSA_KEY_FILE, "", NULL);
1205: sensitive_data.keys[5] = key_load_private_type(KEY_ECDSA,
1.349 djm 1206: _PATH_HOST_ECDSA_KEY_FILE, "", NULL, NULL);
1.411 djm 1207: sensitive_data.keys[6] = key_load_private_type(KEY_ED25519,
1208: _PATH_HOST_ED25519_KEY_FILE, "", NULL, NULL);
1.397 djm 1209: sensitive_data.keys[7] = key_load_private_type(KEY_RSA,
1.276 dtucker 1210: _PATH_HOST_RSA_KEY_FILE, "", NULL, NULL);
1.411 djm 1211: sensitive_data.keys[8] = key_load_private_type(KEY_DSA,
1212: _PATH_HOST_DSA_KEY_FILE, "", NULL, NULL);
1.177 markus 1213: PRIV_END;
1.173 markus 1214:
1.181 markus 1215: if (options.hostbased_authentication == 1 &&
1216: sensitive_data.keys[0] == NULL &&
1.349 djm 1217: sensitive_data.keys[5] == NULL &&
1.396 markus 1218: sensitive_data.keys[6] == NULL &&
1.397 djm 1219: sensitive_data.keys[7] == NULL &&
1220: sensitive_data.keys[8] == NULL) {
1.345 djm 1221: sensitive_data.keys[1] = key_load_cert(
1.411 djm 1222: _PATH_HOST_ECDSA_KEY_FILE);
1.345 djm 1223: sensitive_data.keys[2] = key_load_cert(
1.411 djm 1224: _PATH_HOST_ED25519_KEY_FILE);
1.349 djm 1225: sensitive_data.keys[3] = key_load_cert(
1.345 djm 1226: _PATH_HOST_RSA_KEY_FILE);
1.397 djm 1227: sensitive_data.keys[4] = key_load_cert(
1.411 djm 1228: _PATH_HOST_DSA_KEY_FILE);
1.397 djm 1229: sensitive_data.keys[5] = key_load_public(
1.411 djm 1230: _PATH_HOST_ECDSA_KEY_FILE, NULL);
1.397 djm 1231: sensitive_data.keys[6] = key_load_public(
1.411 djm 1232: _PATH_HOST_ED25519_KEY_FILE, NULL);
1.397 djm 1233: sensitive_data.keys[7] = key_load_public(
1.173 markus 1234: _PATH_HOST_RSA_KEY_FILE, NULL);
1.397 djm 1235: sensitive_data.keys[8] = key_load_public(
1.411 djm 1236: _PATH_HOST_DSA_KEY_FILE, NULL);
1.173 markus 1237: sensitive_data.external_keysign = 1;
1238: }
1.31 markus 1239: }
1.33 markus 1240: /*
1241: * Get rid of any extra privileges that we may have. We will no
1242: * longer need them. Also, extra privileges could make it very hard
1243: * to read identity files and other non-world-readable files from the
1244: * user's home directory if it happens to be on a NFS volume where
1245: * root is mapped to nobody.
1246: */
1.225 dtucker 1247: if (original_effective_uid == 0) {
1248: PRIV_START;
1249: permanently_set_uid(pw);
1250: }
1.31 markus 1251:
1.33 markus 1252: /*
1253: * Now that we are back to our own permissions, create ~/.ssh
1.254 djm 1254: * directory if it doesn't already exist.
1.33 markus 1255: */
1.367 djm 1256: if (config == NULL) {
1257: r = snprintf(buf, sizeof buf, "%s%s%s", pw->pw_dir,
1258: strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR);
1259: if (r > 0 && (size_t)r < sizeof(buf) && stat(buf, &st) < 0)
1260: if (mkdir(buf, 0700) < 0)
1261: error("Could not create directory '%.200s'.",
1262: buf);
1263: }
1.31 markus 1264:
1.104 markus 1265: /* load options.identity_files */
1266: load_public_identity_files();
1267:
1268: /* Expand ~ in known host file names. */
1.361 djm 1269: tilde_expand_paths(options.system_hostfiles,
1270: options.num_system_hostfiles);
1271: tilde_expand_paths(options.user_hostfiles, options.num_user_hostfiles);
1.149 markus 1272:
1273: signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
1.352 djm 1274: signal(SIGCHLD, main_sigchld_handler);
1.31 markus 1275:
1.316 djm 1276: /* Log into the remote system. Never returns if the login fails. */
1.303 djm 1277: ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr,
1.355 djm 1278: options.port, pw, timeout_ms);
1.339 djm 1279:
1280: if (packet_connection_is_on_socket()) {
1281: verbose("Authenticated to %s ([%s]:%d).", host,
1282: get_remote_ipaddr(), get_remote_port());
1283: } else {
1284: verbose("Authenticated to %s (via proxy).", host);
1285: }
1.31 markus 1286:
1.112 markus 1287: /* We no longer need the private host keys. Clear them now. */
1288: if (sensitive_data.nkeys != 0) {
1289: for (i = 0; i < sensitive_data.nkeys; i++) {
1290: if (sensitive_data.keys[i] != NULL) {
1291: /* Destroys contents safely */
1292: debug3("clear hostkey %d", i);
1293: key_free(sensitive_data.keys[i]);
1294: sensitive_data.keys[i] = NULL;
1295: }
1296: }
1.378 djm 1297: free(sensitive_data.keys);
1.134 markus 1298: }
1299: for (i = 0; i < options.num_identity_files; i++) {
1.378 djm 1300: free(options.identity_files[i]);
1301: options.identity_files[i] = NULL;
1.134 markus 1302: if (options.identity_keys[i]) {
1303: key_free(options.identity_keys[i]);
1304: options.identity_keys[i] = NULL;
1305: }
1.112 markus 1306: }
1.31 markus 1307:
1.45 markus 1308: exit_status = compat20 ? ssh_session2() : ssh_session();
1309: packet_close();
1.186 djm 1310:
1.312 djm 1311: if (options.control_path != NULL && muxserver_sock != -1)
1.214 djm 1312: unlink(options.control_path);
1313:
1.353 djm 1314: /* Kill ProxyCommand if it is running. */
1315: ssh_kill_proxy_command();
1.186 djm 1316:
1.45 markus 1317: return exit_status;
1318: }
1319:
1.344 djm 1320: static void
1321: control_persist_detach(void)
1322: {
1323: pid_t pid;
1.346 djm 1324: int devnull;
1.344 djm 1325:
1326: debug("%s: backgrounding master process", __func__);
1327:
1328: /*
1329: * master (current process) into the background, and make the
1330: * foreground process a client of the backgrounded master.
1331: */
1332: switch ((pid = fork())) {
1333: case -1:
1334: fatal("%s: fork: %s", __func__, strerror(errno));
1335: case 0:
1336: /* Child: master process continues mainloop */
1337: break;
1338: default:
1339: /* Parent: set up mux slave to connect to backgrounded master */
1340: debug2("%s: background process is %ld", __func__, (long)pid);
1341: stdin_null_flag = ostdin_null_flag;
1.359 djm 1342: options.request_tty = orequest_tty;
1.344 djm 1343: tty_flag = otty_flag;
1344: close(muxserver_sock);
1345: muxserver_sock = -1;
1.351 markus 1346: options.control_master = SSHCTL_MASTER_NO;
1.344 djm 1347: muxclient(options.control_path);
1348: /* muxclient() doesn't return on success. */
1349: fatal("Failed to connect to new control master");
1350: }
1.346 djm 1351: if ((devnull = open(_PATH_DEVNULL, O_RDWR)) == -1) {
1352: error("%s: open(\"/dev/null\"): %s", __func__,
1353: strerror(errno));
1354: } else {
1355: if (dup2(devnull, STDIN_FILENO) == -1 ||
1356: dup2(devnull, STDOUT_FILENO) == -1)
1357: error("%s: dup2: %s", __func__, strerror(errno));
1358: if (devnull > STDERR_FILENO)
1359: close(devnull);
1360: }
1.381 djm 1361: daemon(1, 1);
1.362 djm 1362: setproctitle("%s [mux]", options.control_path);
1.344 djm 1363: }
1364:
1365: /* Do fork() after authentication. Used by "ssh -f" */
1366: static void
1367: fork_postauth(void)
1368: {
1369: if (need_controlpersist_detach)
1370: control_persist_detach();
1371: debug("forking to background");
1372: fork_after_authentication_flag = 0;
1373: if (daemon(1, 1) < 0)
1374: fatal("daemon() failed: %.200s", strerror(errno));
1375: }
1376:
1.315 djm 1377: /* Callback for remote forward global requests */
1378: static void
1379: ssh_confirm_remote_forward(int type, u_int32_t seq, void *ctxt)
1380: {
1.406 millert 1381: struct Forward *rfwd = (struct Forward *)ctxt;
1.315 djm 1382:
1.324 djm 1383: /* XXX verbose() on failure? */
1.404 markus 1384: debug("remote forward %s for: listen %s%s%d, connect %s:%d",
1.315 djm 1385: type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
1.406 millert 1386: rfwd->listen_path ? rfwd->listen_path :
1387: rfwd->listen_host ? rfwd->listen_host : "",
1388: (rfwd->listen_path || rfwd->listen_host) ? ":" : "",
1389: rfwd->listen_port, rfwd->connect_path ? rfwd->connect_path :
1390: rfwd->connect_host, rfwd->connect_port);
1391: if (rfwd->listen_path == NULL && rfwd->listen_port == 0) {
1.366 markus 1392: if (type == SSH2_MSG_REQUEST_SUCCESS) {
1393: rfwd->allocated_port = packet_get_int();
1394: logit("Allocated port %u for remote forward to %s:%d",
1395: rfwd->allocated_port,
1396: rfwd->connect_host, rfwd->connect_port);
1397: channel_update_permitted_opens(rfwd->handle,
1398: rfwd->allocated_port);
1399: } else {
1400: channel_update_permitted_opens(rfwd->handle, -1);
1401: }
1.324 djm 1402: }
1403:
1.315 djm 1404: if (type == SSH2_MSG_REQUEST_FAILURE) {
1.406 millert 1405: if (options.exit_on_forward_failure) {
1406: if (rfwd->listen_path != NULL)
1407: fatal("Error: remote port forwarding failed "
1408: "for listen path %s", rfwd->listen_path);
1409: else
1410: fatal("Error: remote port forwarding failed "
1411: "for listen port %d", rfwd->listen_port);
1412: } else {
1413: if (rfwd->listen_path != NULL)
1414: logit("Warning: remote port forwarding failed "
1415: "for listen path %s", rfwd->listen_path);
1416: else
1417: logit("Warning: remote port forwarding failed "
1418: "for listen port %d", rfwd->listen_port);
1419: }
1.315 djm 1420: }
1.318 djm 1421: if (++remote_forward_confirms_received == options.num_remote_forwards) {
1.315 djm 1422: debug("All remote forwarding requests processed");
1.344 djm 1423: if (fork_after_authentication_flag)
1424: fork_postauth();
1.318 djm 1425: }
1.315 djm 1426: }
1427:
1.126 itojun 1428: static void
1.331 dtucker 1429: client_cleanup_stdio_fwd(int id, void *arg)
1430: {
1431: debug("stdio forwarding: done");
1432: cleanup_exit(0);
1433: }
1434:
1.368 djm 1435: static void
1.407 djm 1436: ssh_stdio_confirm(int id, int success, void *arg)
1437: {
1438: if (!success)
1439: fatal("stdio forwarding failed");
1440: }
1441:
1442: static void
1.368 djm 1443: ssh_init_stdio_forwarding(void)
1.331 dtucker 1444: {
1445: Channel *c;
1.332 djm 1446: int in, out;
1.331 dtucker 1447:
1.368 djm 1448: if (stdio_forward_host == NULL)
1449: return;
1.384 djm 1450: if (!compat20)
1.368 djm 1451: fatal("stdio forwarding require Protocol 2");
1452:
1453: debug3("%s: %s:%d", __func__, stdio_forward_host, stdio_forward_port);
1.332 djm 1454:
1.368 djm 1455: if ((in = dup(STDIN_FILENO)) < 0 ||
1456: (out = dup(STDOUT_FILENO)) < 0)
1.332 djm 1457: fatal("channel_connect_stdio_fwd: dup() in/out failed");
1.368 djm 1458: if ((c = channel_connect_stdio_fwd(stdio_forward_host,
1459: stdio_forward_port, in, out)) == NULL)
1460: fatal("%s: channel_connect_stdio_fwd failed", __func__);
1.331 dtucker 1461: channel_register_cleanup(c->self, client_cleanup_stdio_fwd, 0);
1.407 djm 1462: channel_register_open_confirm(c->self, ssh_stdio_confirm, NULL);
1.331 dtucker 1463: }
1464:
1465: static void
1.70 markus 1466: ssh_init_forwarding(void)
1467: {
1.86 markus 1468: int success = 0;
1.70 markus 1469: int i;
1.331 dtucker 1470:
1.70 markus 1471: /* Initiate local TCP/IP port forwardings. */
1472: for (i = 0; i < options.num_local_forwards; i++) {
1.232 djm 1473: debug("Local connections to %.200s:%d forwarded to remote "
1474: "address %.200s:%d",
1.406 millert 1475: (options.local_forwards[i].listen_path != NULL) ?
1476: options.local_forwards[i].listen_path :
1.234 deraadt 1477: (options.local_forwards[i].listen_host == NULL) ?
1.406 millert 1478: (options.fwd_opts.gateway_ports ? "*" : "LOCALHOST") :
1.232 djm 1479: options.local_forwards[i].listen_host,
1480: options.local_forwards[i].listen_port,
1.406 millert 1481: (options.local_forwards[i].connect_path != NULL) ?
1482: options.local_forwards[i].connect_path :
1.232 djm 1483: options.local_forwards[i].connect_host,
1484: options.local_forwards[i].connect_port);
1.158 markus 1485: success += channel_setup_local_fwd_listener(
1.406 millert 1486: &options.local_forwards[i], &options.fwd_opts);
1.70 markus 1487: }
1.283 markus 1488: if (i > 0 && success != i && options.exit_on_forward_failure)
1489: fatal("Could not request local forwarding.");
1.86 markus 1490: if (i > 0 && success == 0)
1491: error("Could not request local forwarding.");
1.70 markus 1492:
1493: /* Initiate remote TCP/IP port forwardings. */
1494: for (i = 0; i < options.num_remote_forwards; i++) {
1.232 djm 1495: debug("Remote connections from %.200s:%d forwarded to "
1496: "local address %.200s:%d",
1.406 millert 1497: (options.remote_forwards[i].listen_path != NULL) ?
1498: options.remote_forwards[i].listen_path :
1.248 djm 1499: (options.remote_forwards[i].listen_host == NULL) ?
1.253 djm 1500: "LOCALHOST" : options.remote_forwards[i].listen_host,
1.232 djm 1501: options.remote_forwards[i].listen_port,
1.406 millert 1502: (options.remote_forwards[i].connect_path != NULL) ?
1503: options.remote_forwards[i].connect_path :
1.232 djm 1504: options.remote_forwards[i].connect_host,
1505: options.remote_forwards[i].connect_port);
1.366 markus 1506: options.remote_forwards[i].handle =
1507: channel_request_remote_forwarding(
1.406 millert 1508: &options.remote_forwards[i]);
1.366 markus 1509: if (options.remote_forwards[i].handle < 0) {
1.283 markus 1510: if (options.exit_on_forward_failure)
1511: fatal("Could not request remote forwarding.");
1512: else
1513: logit("Warning: Could not request remote "
1514: "forwarding.");
1.366 markus 1515: } else {
1516: client_register_global_confirm(ssh_confirm_remote_forward,
1517: &options.remote_forwards[i]);
1.283 markus 1518: }
1.70 markus 1519: }
1.301 djm 1520:
1521: /* Initiate tunnel forwarding. */
1522: if (options.tun_open != SSH_TUNMODE_NO) {
1523: if (client_request_tun_fwd(options.tun_open,
1524: options.tun_local, options.tun_remote) == -1) {
1525: if (options.exit_on_forward_failure)
1526: fatal("Could not request tunnel forwarding.");
1527: else
1528: error("Could not request tunnel forwarding.");
1529: }
1530: }
1.70 markus 1531: }
1532:
1.126 itojun 1533: static void
1.70 markus 1534: check_agent_present(void)
1535: {
1.412 djm 1536: int r;
1537:
1.70 markus 1538: if (options.forward_agent) {
1.254 djm 1539: /* Clear agent forwarding if we don't have an agent. */
1.412 djm 1540: if ((r = ssh_get_authentication_socket(NULL)) != 0) {
1.70 markus 1541: options.forward_agent = 0;
1.412 djm 1542: if (r != SSH_ERR_AGENT_NOT_PRESENT)
1543: debug("ssh_get_authentication_socket: %s",
1544: ssh_err(r));
1545: }
1.70 markus 1546: }
1547: }
1548:
1.126 itojun 1549: static int
1.45 markus 1550: ssh_session(void)
1551: {
1552: int type;
1553: int interactive = 0;
1554: int have_tty = 0;
1555: struct winsize ws;
1556: char *cp;
1.243 djm 1557: const char *display;
1.45 markus 1558:
1.31 markus 1559: /* Enable compression if requested. */
1560: if (options.compression) {
1.316 djm 1561: debug("Requesting compression at level %d.",
1562: options.compression_level);
1.31 markus 1563:
1.316 djm 1564: if (options.compression_level < 1 ||
1565: options.compression_level > 9)
1566: fatal("Compression level must be from 1 (fast) to "
1567: "9 (slow, best).");
1.31 markus 1568:
1569: /* Send the request. */
1570: packet_start(SSH_CMSG_REQUEST_COMPRESSION);
1571: packet_put_int(options.compression_level);
1572: packet_send();
1573: packet_write_wait();
1.156 markus 1574: type = packet_read();
1.31 markus 1575: if (type == SSH_SMSG_SUCCESS)
1576: packet_start_compression(options.compression_level);
1577: else if (type == SSH_SMSG_FAILURE)
1.191 itojun 1578: logit("Warning: Remote host refused compression.");
1.31 markus 1579: else
1.316 djm 1580: packet_disconnect("Protocol error waiting for "
1581: "compression response.");
1.31 markus 1582: }
1583: /* Allocate a pseudo tty if appropriate. */
1584: if (tty_flag) {
1585: debug("Requesting pty.");
1586:
1587: /* Start the packet. */
1588: packet_start(SSH_CMSG_REQUEST_PTY);
1589:
1590: /* Store TERM in the packet. There is no limit on the
1591: length of the string. */
1592: cp = getenv("TERM");
1593: if (!cp)
1594: cp = "";
1.124 markus 1595: packet_put_cstring(cp);
1.31 markus 1596:
1597: /* Store window size in the packet. */
1598: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
1599: memset(&ws, 0, sizeof(ws));
1.269 deraadt 1600: packet_put_int((u_int)ws.ws_row);
1601: packet_put_int((u_int)ws.ws_col);
1602: packet_put_int((u_int)ws.ws_xpixel);
1603: packet_put_int((u_int)ws.ws_ypixel);
1.31 markus 1604:
1605: /* Store tty modes in the packet. */
1.115 stevesk 1606: tty_make_modes(fileno(stdin), NULL);
1.31 markus 1607:
1608: /* Send the packet, and wait for it to leave. */
1609: packet_send();
1610: packet_write_wait();
1611:
1612: /* Read response from the server. */
1.156 markus 1613: type = packet_read();
1.43 markus 1614: if (type == SSH_SMSG_SUCCESS) {
1.31 markus 1615: interactive = 1;
1.45 markus 1616: have_tty = 1;
1.43 markus 1617: } else if (type == SSH_SMSG_FAILURE)
1.316 djm 1618: logit("Warning: Remote host failed or refused to "
1619: "allocate a pseudo tty.");
1.31 markus 1620: else
1.316 djm 1621: packet_disconnect("Protocol error waiting for pty "
1622: "request response.");
1.31 markus 1623: }
1624: /* Request X11 forwarding if enabled and DISPLAY is set. */
1.243 djm 1625: display = getenv("DISPLAY");
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");
1.243 djm 1727: if (options.forward_x11 && display != NULL) {
1.150 stevesk 1728: char *proto, *data;
1.50 markus 1729: /* Get reasonable local authentication information. */
1.243 djm 1730: client_x11_get_proto(display, options.xauth_location,
1.340 djm 1731: options.forward_x11_trusted,
1732: options.forward_x11_timeout, &proto, &data);
1.50 markus 1733: /* Request forwarding with authentication spoofing. */
1.316 djm 1734: debug("Requesting X11 forwarding with authentication "
1735: "spoofing.");
1.363 djm 1736: x11_request_forwarding_with_spoofing(id, display, proto,
1737: data, 1);
1738: client_expect_confirm(id, "X11 forwarding", CONFIRM_WARN);
1739: /* XXX exit_on_forward_failure */
1.80 markus 1740: interactive = 1;
1.50 markus 1741: }
1742:
1.70 markus 1743: check_agent_present();
1744: if (options.forward_agent) {
1745: debug("Requesting authentication agent forwarding.");
1746: channel_request_start(id, "auth-agent-req@openssh.com", 0);
1747: packet_send();
1.212 djm 1748: }
1.369 dtucker 1749:
1750: /* Tell the packet module whether this is an interactive session. */
1751: packet_set_interactive(interactive,
1752: options.ip_qos_interactive, options.ip_qos_bulk);
1.212 djm 1753:
1.214 djm 1754: client_session2_setup(id, tty_flag, subsystem_flag, getenv("TERM"),
1.311 djm 1755: NULL, fileno(stdin), &command, environ);
1.45 markus 1756: }
1757:
1.143 markus 1758: /* open new channel for a session */
1.126 itojun 1759: static int
1.143 markus 1760: ssh_session2_open(void)
1.45 markus 1761: {
1.118 markus 1762: Channel *c;
1763: int window, packetmax, in, out, err;
1.60 markus 1764:
1.62 markus 1765: if (stdin_null_flag) {
1.93 itojun 1766: in = open(_PATH_DEVNULL, O_RDONLY);
1.62 markus 1767: } else {
1768: in = dup(STDIN_FILENO);
1769: }
1.60 markus 1770: out = dup(STDOUT_FILENO);
1771: err = dup(STDERR_FILENO);
1.45 markus 1772:
1773: if (in < 0 || out < 0 || err < 0)
1.62 markus 1774: fatal("dup() in/out/err failed");
1.45 markus 1775:
1.69 markus 1776: /* enable nonblocking unless tty */
1777: if (!isatty(in))
1778: set_nonblock(in);
1779: if (!isatty(out))
1780: set_nonblock(out);
1781: if (!isatty(err))
1782: set_nonblock(err);
1783:
1.65 markus 1784: window = CHAN_SES_WINDOW_DEFAULT;
1785: packetmax = CHAN_SES_PACKET_DEFAULT;
1.164 markus 1786: if (tty_flag) {
1787: window >>= 1;
1788: packetmax >>= 1;
1.45 markus 1789: }
1.118 markus 1790: c = channel_new(
1.45 markus 1791: "session", SSH_CHANNEL_OPENING, in, out, err,
1.65 markus 1792: window, packetmax, CHAN_EXTENDED_WRITE,
1.192 markus 1793: "client-session", /*nonblock*/0);
1.45 markus 1794:
1.143 markus 1795: debug3("ssh_session2_open: channel_new: %d", c->self);
1.106 markus 1796:
1.122 markus 1797: channel_send_open(c->self);
1.143 markus 1798: if (!no_shell_flag)
1.310 djm 1799: channel_register_open_confirm(c->self,
1800: ssh_session2_setup, NULL);
1.106 markus 1801:
1.118 markus 1802: return c->self;
1.106 markus 1803: }
1804:
1.126 itojun 1805: static int
1.106 markus 1806: ssh_session2(void)
1807: {
1.143 markus 1808: int id = -1;
1.106 markus 1809:
1810: /* XXX should be pre-session */
1.368 djm 1811: if (!options.control_persist)
1812: ssh_init_stdio_forwarding();
1.106 markus 1813: ssh_init_forwarding();
1814:
1.344 djm 1815: /* Start listening for multiplex clients */
1816: muxserver_listen();
1817:
1818: /*
1.368 djm 1819: * If we are in control persist mode and have a working mux listen
1820: * socket, then prepare to background ourselves and have a foreground
1821: * client attach as a control slave.
1822: * NB. we must save copies of the flags that we override for
1.344 djm 1823: * the backgrounding, since we defer attachment of the slave until
1824: * after the connection is fully established (in particular,
1825: * async rfwd replies have been received for ExitOnForwardFailure).
1826: */
1827: if (options.control_persist && muxserver_sock != -1) {
1828: ostdin_null_flag = stdin_null_flag;
1829: ono_shell_flag = no_shell_flag;
1.359 djm 1830: orequest_tty = options.request_tty;
1.344 djm 1831: otty_flag = tty_flag;
1832: stdin_null_flag = 1;
1833: no_shell_flag = 1;
1834: tty_flag = 0;
1835: if (!fork_after_authentication_flag)
1836: need_controlpersist_detach = 1;
1837: fork_after_authentication_flag = 1;
1838: }
1.368 djm 1839: /*
1840: * ControlPersist mux listen socket setup failed, attempt the
1841: * stdio forward setup that we skipped earlier.
1842: */
1843: if (options.control_persist && muxserver_sock == -1)
1844: ssh_init_stdio_forwarding();
1.344 djm 1845:
1.143 markus 1846: if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN))
1847: id = ssh_session2_open();
1.379 djm 1848: else {
1849: packet_set_interactive(
1850: options.control_master == SSHCTL_MASTER_NO,
1851: options.ip_qos_interactive, options.ip_qos_bulk);
1852: }
1.314 djm 1853:
1854: /* If we don't expect to open a new session, then disallow it */
1.319 markus 1855: if (options.control_master == SSHCTL_MASTER_NO &&
1856: (datafellows & SSH_NEW_OPENSSH)) {
1.314 djm 1857: debug("Requesting no-more-sessions@openssh.com");
1858: packet_start(SSH2_MSG_GLOBAL_REQUEST);
1859: packet_put_cstring("no-more-sessions@openssh.com");
1860: packet_put_char(0);
1861: packet_send();
1862: }
1.255 reyk 1863:
1864: /* Execute a local command */
1865: if (options.local_command != NULL &&
1866: options.permit_local_command)
1867: ssh_local_cmd(options.local_command);
1.301 djm 1868:
1.342 djm 1869: /*
1870: * If requested and we are not interested in replies to remote
1871: * forwarding requests, then let ssh continue in the background.
1872: */
1.344 djm 1873: if (fork_after_authentication_flag) {
1874: if (options.exit_on_forward_failure &&
1875: options.num_remote_forwards > 0) {
1876: debug("deferring postauth fork until remote forward "
1877: "confirmation received");
1878: } else
1879: fork_postauth();
1.318 djm 1880: }
1.327 andreas 1881:
1882: if (options.use_roaming)
1883: request_roaming();
1.31 markus 1884:
1.119 stevesk 1885: return client_loop(tty_flag, tty_flag ?
1886: options.escape_char : SSH_ESCAPECHAR_NONE, id);
1.72 markus 1887: }
1888:
1.126 itojun 1889: static void
1.104 markus 1890: load_public_identity_files(void)
1891: {
1.275 djm 1892: char *filename, *cp, thishost[NI_MAXHOST];
1.306 deraadt 1893: char *pwdir = NULL, *pwname = NULL;
1.167 markus 1894: int i = 0;
1.104 markus 1895: Key *public;
1.275 djm 1896: struct passwd *pw;
1.335 djm 1897: u_int n_ids;
1898: char *identity_files[SSH_MAX_IDENTITY_FILES];
1899: Key *identity_keys[SSH_MAX_IDENTITY_FILES];
1.333 markus 1900: #ifdef ENABLE_PKCS11
1.167 markus 1901: Key **keys;
1.333 markus 1902: int nkeys;
1.335 djm 1903: #endif /* PKCS11 */
1.104 markus 1904:
1.335 djm 1905: n_ids = 0;
1.398 tedu 1906: memset(identity_files, 0, sizeof(identity_files));
1907: memset(identity_keys, 0, sizeof(identity_keys));
1.335 djm 1908:
1909: #ifdef ENABLE_PKCS11
1.333 markus 1910: if (options.pkcs11_provider != NULL &&
1.167 markus 1911: options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
1.333 markus 1912: (pkcs11_init(!options.batch_mode) == 0) &&
1913: (nkeys = pkcs11_add_provider(options.pkcs11_provider, NULL,
1914: &keys)) > 0) {
1915: for (i = 0; i < nkeys; i++) {
1.335 djm 1916: if (n_ids >= SSH_MAX_IDENTITY_FILES) {
1917: key_free(keys[i]);
1918: continue;
1919: }
1920: identity_keys[n_ids] = keys[i];
1921: identity_files[n_ids] =
1.333 markus 1922: xstrdup(options.pkcs11_provider); /* XXX */
1.335 djm 1923: n_ids++;
1.167 markus 1924: }
1.378 djm 1925: free(keys);
1.127 markus 1926: }
1.333 markus 1927: #endif /* ENABLE_PKCS11 */
1.275 djm 1928: if ((pw = getpwuid(original_real_uid)) == NULL)
1929: fatal("load_public_identity_files: getpwuid failed");
1.307 dtucker 1930: pwname = xstrdup(pw->pw_name);
1931: pwdir = xstrdup(pw->pw_dir);
1.275 djm 1932: if (gethostname(thishost, sizeof(thishost)) == -1)
1933: fatal("load_public_identity_files: gethostname: %s",
1934: strerror(errno));
1.335 djm 1935: for (i = 0; i < options.num_identity_files; i++) {
1.373 djm 1936: if (n_ids >= SSH_MAX_IDENTITY_FILES ||
1937: strcasecmp(options.identity_files[i], "none") == 0) {
1.378 djm 1938: free(options.identity_files[i]);
1.335 djm 1939: continue;
1940: }
1.275 djm 1941: cp = tilde_expand_filename(options.identity_files[i],
1.131 millert 1942: original_real_uid);
1.306 deraadt 1943: filename = percent_expand(cp, "d", pwdir,
1944: "u", pwname, "l", thishost, "h", host,
1.275 djm 1945: "r", options.user, (char *)NULL);
1.378 djm 1946: free(cp);
1.131 millert 1947: public = key_load_public(filename, NULL);
1948: debug("identity file %s type %d", filename,
1949: public ? public->type : -1);
1.378 djm 1950: free(options.identity_files[i]);
1.335 djm 1951: identity_files[n_ids] = filename;
1952: identity_keys[n_ids] = public;
1953:
1954: if (++n_ids >= SSH_MAX_IDENTITY_FILES)
1955: continue;
1956:
1957: /* Try to add the certificate variant too */
1958: xasprintf(&cp, "%s-cert", filename);
1959: public = key_load_public(cp, NULL);
1960: debug("identity file %s type %d", cp,
1961: public ? public->type : -1);
1962: if (public == NULL) {
1.378 djm 1963: free(cp);
1.335 djm 1964: continue;
1965: }
1966: if (!key_is_cert(public)) {
1967: debug("%s: key %s type %s is not a certificate",
1968: __func__, cp, key_type(public));
1969: key_free(public);
1.378 djm 1970: free(cp);
1.335 djm 1971: continue;
1972: }
1973: identity_keys[n_ids] = public;
1974: /* point to the original path, most likely the private key */
1975: identity_files[n_ids] = xstrdup(filename);
1976: n_ids++;
1977: }
1978: options.num_identity_files = n_ids;
1979: memcpy(options.identity_files, identity_files, sizeof(identity_files));
1980: memcpy(options.identity_keys, identity_keys, sizeof(identity_keys));
1981:
1.398 tedu 1982: explicit_bzero(pwname, strlen(pwname));
1.378 djm 1983: free(pwname);
1.398 tedu 1984: explicit_bzero(pwdir, strlen(pwdir));
1.378 djm 1985: free(pwdir);
1.214 djm 1986: }
1.352 djm 1987:
1988: static void
1989: main_sigchld_handler(int sig)
1990: {
1991: int save_errno = errno;
1992: pid_t pid;
1993: int status;
1994:
1995: while ((pid = waitpid(-1, &status, WNOHANG)) > 0 ||
1996: (pid < 0 && errno == EINTR))
1997: ;
1998:
1999: signal(sig, main_sigchld_handler);
2000: errno = save_errno;
2001: }
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