Annotation of src/usr.bin/ssh/ssh.c, Revision 1.415
1.415 ! djm 1: /* $OpenBSD: ssh.c,v 1.414 2015/01/20 23:14:00 deraadt 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);
1.376 djm 651: if (cp == NULL)
652: fatal("Unsupported query \"%s\"", optarg);
653: printf("%s\n", cp);
654: free(cp);
655: exit(0);
1.31 markus 656: break;
657: case 'a':
658: options.forward_agent = 0;
1.53 markus 659: break;
660: case 'A':
661: options.forward_agent = 1;
1.31 markus 662: break;
663: case 'k':
1.204 dtucker 664: options.gss_deleg_creds = 0;
1.297 djm 665: break;
666: case 'K':
667: options.gss_authentication = 1;
668: options.gss_deleg_creds = 1;
1.31 markus 669: break;
670: case 'i':
671: if (stat(optarg, &st) < 0) {
1.128 fgsch 672: fprintf(stderr, "Warning: Identity file %s "
1.231 otto 673: "not accessible: %s.\n", optarg,
674: strerror(errno));
1.31 markus 675: break;
676: }
1.371 dtucker 677: add_identity_file(&options, NULL, optarg, 1);
1.31 markus 678: break;
1.127 markus 679: case 'I':
1.333 markus 680: #ifdef ENABLE_PKCS11
681: options.pkcs11_provider = xstrdup(optarg);
1.137 jakob 682: #else
1.333 markus 683: fprintf(stderr, "no support for PKCS#11.\n");
1.137 jakob 684: #endif
1.127 markus 685: break;
1.31 markus 686: case 't':
1.359 djm 687: if (options.request_tty == REQUEST_TTY_YES)
688: options.request_tty = REQUEST_TTY_FORCE;
689: else
690: options.request_tty = REQUEST_TTY_YES;
1.31 markus 691: break;
692: case 'v':
1.197 markus 693: if (debug_flag == 0) {
1.66 markus 694: debug_flag = 1;
695: options.log_level = SYSLOG_LEVEL_DEBUG1;
1.197 markus 696: } else {
697: if (options.log_level < SYSLOG_LEVEL_DEBUG3)
698: options.log_level++;
699: }
1.375 dtucker 700: break;
1.31 markus 701: case 'V':
1.209 markus 702: fprintf(stderr, "%s, %s\n",
1.402 markus 703: SSH_VERSION,
704: #ifdef WITH_OPENSSL
705: SSLeay_version(SSLEAY_VERSION)
706: #else
707: "without OpenSSL"
708: #endif
709: );
1.31 markus 710: if (opt == 'V')
711: exit(0);
712: break;
1.255 reyk 713: case 'w':
1.256 reyk 714: if (options.tun_open == -1)
715: options.tun_open = SSH_TUNMODE_DEFAULT;
1.255 reyk 716: options.tun_local = a2tun(optarg, &options.tun_remote);
1.256 reyk 717: if (options.tun_local == SSH_TUNID_ERR) {
1.316 djm 718: fprintf(stderr,
719: "Bad tun device '%s'\n", optarg);
1.257 dtucker 720: exit(255);
1.255 reyk 721: }
722: break;
1.331 dtucker 723: case 'W':
1.332 djm 724: if (stdio_forward_host != NULL)
725: fatal("stdio forward already specified");
726: if (muxclient_command != 0)
727: fatal("Cannot specify stdio forward with -O");
1.331 dtucker 728: if (parse_forward(&fwd, optarg, 1, 0)) {
729: stdio_forward_host = fwd.listen_host;
730: stdio_forward_port = fwd.listen_port;
1.378 djm 731: free(fwd.connect_host);
1.331 dtucker 732: } else {
733: fprintf(stderr,
734: "Bad stdio forwarding specification '%s'\n",
735: optarg);
736: exit(255);
737: }
1.359 djm 738: options.request_tty = REQUEST_TTY_NO;
1.331 dtucker 739: no_shell_flag = 1;
740: options.clear_forwardings = 1;
741: options.exit_on_forward_failure = 1;
742: break;
1.31 markus 743: case 'q':
744: options.log_level = SYSLOG_LEVEL_QUIET;
745: break;
746: case 'e':
747: if (optarg[0] == '^' && optarg[2] == 0 &&
1.128 fgsch 748: (u_char) optarg[1] >= 64 &&
749: (u_char) optarg[1] < 128)
1.78 markus 750: options.escape_char = (u_char) optarg[1] & 31;
1.31 markus 751: else if (strlen(optarg) == 1)
1.78 markus 752: options.escape_char = (u_char) optarg[0];
1.31 markus 753: else if (strcmp(optarg, "none") == 0)
1.119 stevesk 754: options.escape_char = SSH_ESCAPECHAR_NONE;
1.31 markus 755: else {
1.128 fgsch 756: fprintf(stderr, "Bad escape character '%s'.\n",
757: optarg);
1.257 dtucker 758: exit(255);
1.31 markus 759: }
760: break;
761: case 'c':
1.49 markus 762: if (ciphers_valid(optarg)) {
763: /* SSH2 only */
764: options.ciphers = xstrdup(optarg);
1.224 markus 765: options.cipher = SSH_CIPHER_INVALID;
1.49 markus 766: } else {
767: /* SSH1 only */
1.74 markus 768: options.cipher = cipher_number(optarg);
769: if (options.cipher == -1) {
1.128 fgsch 770: fprintf(stderr,
771: "Unknown cipher type '%s'\n",
772: optarg);
1.257 dtucker 773: exit(255);
1.49 markus 774: }
1.128 fgsch 775: if (options.cipher == SSH_CIPHER_3DES)
1.74 markus 776: options.ciphers = "3des-cbc";
1.128 fgsch 777: else if (options.cipher == SSH_CIPHER_BLOWFISH)
1.74 markus 778: options.ciphers = "blowfish-cbc";
1.128 fgsch 779: else
1.74 markus 780: options.ciphers = (char *)-1;
1.95 markus 781: }
782: break;
783: case 'm':
784: if (mac_valid(optarg))
785: options.macs = xstrdup(optarg);
786: else {
1.128 fgsch 787: fprintf(stderr, "Unknown mac type '%s'\n",
788: optarg);
1.257 dtucker 789: exit(255);
1.31 markus 790: }
791: break;
1.214 djm 792: case 'M':
1.242 djm 793: if (options.control_master == SSHCTL_MASTER_YES)
794: options.control_master = SSHCTL_MASTER_ASK;
795: else
796: options.control_master = SSHCTL_MASTER_YES;
1.214 djm 797: break;
1.31 markus 798: case 'p':
1.113 stevesk 799: options.port = a2port(optarg);
1.323 djm 800: if (options.port <= 0) {
1.109 markus 801: fprintf(stderr, "Bad port '%s'\n", optarg);
1.257 dtucker 802: exit(255);
1.109 markus 803: }
1.31 markus 804: break;
805: case 'l':
806: options.user = optarg;
807: break;
1.141 stevesk 808:
809: case 'L':
1.324 djm 810: if (parse_forward(&fwd, optarg, 0, 0))
1.232 djm 811: add_local_forward(&options, &fwd);
812: else {
1.128 fgsch 813: fprintf(stderr,
1.232 djm 814: "Bad local forwarding specification '%s'\n",
1.128 fgsch 815: optarg);
1.257 dtucker 816: exit(255);
1.31 markus 817: }
1.232 djm 818: break;
819:
820: case 'R':
1.324 djm 821: if (parse_forward(&fwd, optarg, 0, 1)) {
1.232 djm 822: add_remote_forward(&options, &fwd);
823: } else {
1.128 fgsch 824: fprintf(stderr,
1.232 djm 825: "Bad remote forwarding specification "
826: "'%s'\n", optarg);
1.257 dtucker 827: exit(255);
1.31 markus 828: }
829: break;
1.108 markus 830:
831: case 'D':
1.324 djm 832: if (parse_forward(&fwd, optarg, 1, 0)) {
1.322 stevesk 833: add_local_forward(&options, &fwd);
1.232 djm 834: } else {
1.322 stevesk 835: fprintf(stderr,
836: "Bad dynamic forwarding specification "
837: "'%s'\n", optarg);
1.257 dtucker 838: exit(255);
1.109 markus 839: }
1.108 markus 840: break;
841:
1.31 markus 842: case 'C':
843: options.compression = 1;
844: break;
1.45 markus 845: case 'N':
846: no_shell_flag = 1;
1.359 djm 847: options.request_tty = REQUEST_TTY_NO;
1.45 markus 848: break;
849: case 'T':
1.359 djm 850: options.request_tty = REQUEST_TTY_NO;
1.45 markus 851: break;
1.31 markus 852: case 'o':
1.205 markus 853: line = xstrdup(optarg);
1.408 djm 854: if (process_config_line(&options, pw,
855: host ? host : "", host ? host : "", line,
856: "command-line", 0, NULL, SSHCONF_USERCONF) != 0)
1.257 dtucker 857: exit(255);
1.378 djm 858: free(line);
1.31 markus 859: break;
1.85 djm 860: case 's':
861: subsystem_flag = 1;
1.117 markus 862: break;
1.214 djm 863: case 'S':
864: if (options.control_path != NULL)
865: free(options.control_path);
866: options.control_path = xstrdup(optarg);
867: break;
1.117 markus 868: case 'b':
869: options.bind_address = optarg;
1.85 djm 870: break;
1.139 markus 871: case 'F':
872: config = optarg;
873: break;
1.31 markus 874: default:
875: usage();
1.1 deraadt 876: }
1.31 markus 877: }
878:
1.128 fgsch 879: ac -= optind;
880: av += optind;
881:
1.329 guenther 882: if (ac > 0 && !host) {
1.188 markus 883: if (strrchr(*av, '@')) {
1.128 fgsch 884: p = xstrdup(*av);
1.188 markus 885: cp = strrchr(p, '@');
1.128 fgsch 886: if (cp == NULL || cp == p)
887: usage();
888: options.user = p;
889: *cp = '\0';
1.385 djm 890: host = xstrdup(++cp);
1.128 fgsch 891: } else
1.385 djm 892: host = xstrdup(*av);
1.189 millert 893: if (ac > 1) {
894: optind = optreset = 1;
1.128 fgsch 895: goto again;
896: }
1.189 millert 897: ac--, av++;
1.128 fgsch 898: }
899:
1.31 markus 900: /* Check that we got a host name. */
901: if (!host)
902: usage();
903:
1.385 djm 904: host_arg = xstrdup(host);
905:
1.402 markus 906: #ifdef WITH_OPENSSL
1.350 djm 907: OpenSSL_add_all_algorithms();
1.72 markus 908: ERR_load_crypto_strings();
1.402 markus 909: #endif
1.31 markus 910:
911: /* Initialize the command to execute on remote host. */
912: buffer_init(&command);
1.1 deraadt 913:
1.33 markus 914: /*
915: * Save the command to execute on the remote host in a buffer. There
916: * is no limit on the length of the command, except by the maximum
917: * packet size. Also sets the tty flag if there is no command.
918: */
1.128 fgsch 919: if (!ac) {
1.31 markus 920: /* No command specified - execute shell on a tty. */
1.85 djm 921: if (subsystem_flag) {
1.128 fgsch 922: fprintf(stderr,
923: "You must specify a subsystem to invoke.\n");
1.85 djm 924: usage();
925: }
1.31 markus 926: } else {
1.128 fgsch 927: /* A command has been specified. Store it into the buffer. */
928: for (i = 0; i < ac; i++) {
929: if (i)
1.31 markus 930: buffer_append(&command, " ", 1);
931: buffer_append(&command, av[i], strlen(av[i]));
932: }
933: }
934:
935: /* Cannot fork to background if no command. */
1.316 djm 936: if (fork_after_authentication_flag && buffer_len(&command) == 0 &&
937: !no_shell_flag)
938: fatal("Cannot fork into background without a command "
939: "to execute.");
1.31 markus 940:
1.101 markus 941: /*
942: * Initialize "log" output. Since we are the client all output
1.375 dtucker 943: * goes to stderr unless otherwise specified by -y or -E.
1.101 markus 944: */
1.375 dtucker 945: if (use_syslog && logfile != NULL)
946: fatal("Can't specify both -y and -E");
947: if (logfile != NULL) {
948: log_redirect_stderr_to(logfile);
1.378 djm 949: free(logfile);
1.375 dtucker 950: }
1.325 markus 951: log_init(argv0,
1.316 djm 952: options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level,
1.320 djm 953: SYSLOG_FACILITY_USER, !use_syslog);
1.375 dtucker 954:
955: if (debug_flag)
1.402 markus 956: logit("%s, %s", SSH_VERSION,
957: #ifdef WITH_OPENSSL
958: SSLeay_version(SSLEAY_VERSION)
959: #else
960: "without OpenSSL"
961: #endif
962: );
1.31 markus 963:
1.400 djm 964: /* Parse the configuration files */
1.408 djm 965: process_config_files(host_arg, pw, 0);
1.400 djm 966:
967: /* Hostname canonicalisation needs a few options filled. */
968: fill_default_options_for_canonicalization(&options);
969:
970: /* If the user has replaced the hostname then take it into use now */
971: if (options.hostname != NULL) {
972: /* NB. Please keep in sync with readconf.c:match_cfg_line() */
973: cp = percent_expand(options.hostname,
974: "h", host, (char *)NULL);
975: free(host);
976: host = cp;
1.408 djm 977: free(options.hostname);
978: options.hostname = xstrdup(host);
1.400 djm 979: }
980:
981: /* If canonicalization requested then try to apply it */
982: lowercase(host);
983: if (options.canonicalize_hostname != SSH_CANONICALISE_NO)
984: addrs = resolve_canonicalize(&host, options.port);
985:
1.139 markus 986: /*
1.401 djm 987: * If CanonicalizePermittedCNAMEs have been specified but
988: * other canonicalization did not happen (by not being requested
989: * or by failing with fallback) then the hostname may still be changed
990: * as a result of CNAME following.
991: *
992: * Try to resolve the bare hostname name using the system resolver's
993: * usual search rules and then apply the CNAME follow rules.
994: *
995: * Skip the lookup if a ProxyCommand is being used unless the user
996: * has specifically requested canonicalisation for this case via
997: * CanonicalizeHostname=always
1.139 markus 998: */
1.401 djm 999: if (addrs == NULL && options.num_permitted_cnames != 0 &&
1000: (option_clear_or_none(options.proxy_command) ||
1.400 djm 1001: options.canonicalize_hostname == SSH_CANONICALISE_ALWAYS)) {
1.403 djm 1002: if ((addrs = resolve_host(host, options.port,
1003: option_clear_or_none(options.proxy_command),
1004: cname, sizeof(cname))) == NULL) {
1005: /* Don't fatal proxied host names not in the DNS */
1006: if (option_clear_or_none(options.proxy_command))
1007: cleanup_exit(255); /* logged in resolve_host */
1008: } else
1009: check_follow_cname(&host, cname);
1.400 djm 1010: }
1.139 markus 1011:
1.400 djm 1012: /*
1.408 djm 1013: * If canonicalisation is enabled then re-parse the configuration
1014: * files as new stanzas may match.
1.400 djm 1015: */
1.408 djm 1016: if (options.canonicalize_hostname != 0) {
1017: debug("Re-reading configuration after hostname "
1018: "canonicalisation");
1019: free(options.hostname);
1020: options.hostname = xstrdup(host);
1021: process_config_files(host_arg, pw, 1);
1022: /*
1023: * Address resolution happens early with canonicalisation
1024: * enabled and the port number may have changed since, so
1025: * reset it in address list
1026: */
1027: if (addrs != NULL && options.port > 0)
1028: set_addrinfo_port(addrs, options.port);
1.139 markus 1029: }
1.31 markus 1030:
1031: /* Fill configuration defaults. */
1032: fill_default_options(&options);
1033:
1.400 djm 1034: if (options.port == 0)
1035: options.port = default_ssh_port();
1.196 djm 1036: channel_set_af(options.address_family);
1037:
1.383 djm 1038: /* Tidy and check options */
1039: if (options.host_key_alias != NULL)
1040: lowercase(options.host_key_alias);
1041: if (options.proxy_command != NULL &&
1042: strcmp(options.proxy_command, "-") == 0 &&
1043: options.proxy_use_fdpass)
1044: fatal("ProxyCommand=- and ProxyUseFDPass are incompatible");
1.415 ! djm 1045: if (options.control_persist &&
! 1046: options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK) {
! 1047: debug("UpdateHostKeys=ask is incompatible with ControlPersist; "
! 1048: "disabling");
! 1049: options.update_hostkeys = 0;
! 1050: }
1.388 djm 1051: if (original_effective_uid != 0)
1052: options.use_privileged_port = 0;
1.383 djm 1053:
1.31 markus 1054: /* reinit */
1.325 markus 1055: log_init(argv0, options.log_level, SYSLOG_FACILITY_USER, !use_syslog);
1.370 djm 1056:
1057: if (options.request_tty == REQUEST_TTY_YES ||
1058: options.request_tty == REQUEST_TTY_FORCE)
1059: tty_flag = 1;
1060:
1061: /* Allocate a tty by default if no command specified. */
1062: if (buffer_len(&command) == 0)
1063: tty_flag = options.request_tty != REQUEST_TTY_NO;
1064:
1065: /* Force no tty */
1066: if (options.request_tty == REQUEST_TTY_NO || muxclient_command != 0)
1067: tty_flag = 0;
1068: /* Do not allocate a tty if stdin is not a tty. */
1069: if ((!isatty(fileno(stdin)) || stdin_null_flag) &&
1070: options.request_tty != REQUEST_TTY_FORCE) {
1071: if (tty_flag)
1072: logit("Pseudo-terminal will not be allocated because "
1073: "stdin is not a terminal.");
1074: tty_flag = 0;
1075: }
1.31 markus 1076:
1077: if (options.user == NULL)
1078: options.user = xstrdup(pw->pw_name);
1.343 djm 1079:
1.358 djm 1080: if (gethostname(thishost, sizeof(thishost)) == -1)
1081: fatal("gethostname: %s", strerror(errno));
1082: strlcpy(shorthost, thishost, sizeof(shorthost));
1083: shorthost[strcspn(thishost, ".")] = '\0';
1084: snprintf(portstr, sizeof(portstr), "%d", options.port);
1085:
1.405 djm 1086: if ((md = ssh_digest_start(SSH_DIGEST_SHA1)) == NULL ||
1087: ssh_digest_update(md, thishost, strlen(thishost)) < 0 ||
1088: ssh_digest_update(md, host, strlen(host)) < 0 ||
1089: ssh_digest_update(md, portstr, strlen(portstr)) < 0 ||
1090: ssh_digest_update(md, options.user, strlen(options.user)) < 0 ||
1091: ssh_digest_final(md, conn_hash, sizeof(conn_hash)) < 0)
1092: fatal("%s: mux digest failed", __func__);
1093: ssh_digest_free(md);
1094: conn_hash_hex = tohex(conn_hash, ssh_digest_bytes(SSH_DIGEST_SHA1));
1095:
1.317 dtucker 1096: if (options.local_command != NULL) {
1097: debug3("expanding LocalCommand: %s", options.local_command);
1098: cp = options.local_command;
1.405 djm 1099: options.local_command = percent_expand(cp,
1100: "C", conn_hash_hex,
1101: "L", shorthost,
1102: "d", pw->pw_dir,
1103: "h", host,
1104: "l", thishost,
1105: "n", host_arg,
1106: "p", portstr,
1107: "r", options.user,
1108: "u", pw->pw_name,
1.358 djm 1109: (char *)NULL);
1.317 dtucker 1110: debug3("expanded LocalCommand: %s", options.local_command);
1.378 djm 1111: free(cp);
1.304 dtucker 1112: }
1.31 markus 1113:
1.214 djm 1114: if (options.control_path != NULL) {
1.241 djm 1115: cp = tilde_expand_filename(options.control_path,
1116: original_real_uid);
1.378 djm 1117: free(options.control_path);
1.405 djm 1118: options.control_path = percent_expand(cp,
1119: "C", conn_hash_hex,
1120: "L", shorthost,
1121: "h", host,
1122: "l", thishost,
1123: "n", host_arg,
1124: "p", portstr,
1125: "r", options.user,
1126: "u", pw->pw_name,
1.358 djm 1127: (char *)NULL);
1.378 djm 1128: free(cp);
1.214 djm 1129: }
1.405 djm 1130: free(conn_hash_hex);
1.408 djm 1131:
1132: if (config_test) {
1133: dump_client_config(&options, host);
1134: exit(0);
1135: }
1.405 djm 1136:
1.312 djm 1137: if (muxclient_command != 0 && options.control_path == NULL)
1.240 djm 1138: fatal("No ControlPath specified for \"-O\" command");
1.242 djm 1139: if (options.control_path != NULL)
1.312 djm 1140: muxclient(options.control_path);
1.401 djm 1141:
1142: /*
1143: * If hostname canonicalisation was not enabled, then we may not
1144: * have yet resolved the hostname. Do so now.
1145: */
1146: if (addrs == NULL && options.proxy_command == NULL) {
1147: if ((addrs = resolve_host(host, options.port, 1,
1148: cname, sizeof(cname))) == NULL)
1149: cleanup_exit(255); /* resolve_host logs the error */
1150: }
1.214 djm 1151:
1.303 djm 1152: timeout_ms = options.connection_timeout * 1000;
1153:
1.77 markus 1154: /* Open a connection to the remote host. */
1.385 djm 1155: if (ssh_connect(host, addrs, &hostaddr, options.port,
1156: options.address_family, options.connection_attempts,
1157: &timeout_ms, options.tcp_keep_alive,
1.388 djm 1158: options.use_privileged_port) != 0)
1.257 dtucker 1159: exit(255);
1.31 markus 1160:
1.391 djm 1161: if (addrs != NULL)
1162: freeaddrinfo(addrs);
1163:
1.385 djm 1164: packet_set_timeout(options.server_alive_interval,
1165: options.server_alive_count_max);
1166:
1.303 djm 1167: if (timeout_ms > 0)
1168: debug3("timeout: %d ms remain after connect", timeout_ms);
1169:
1.33 markus 1170: /*
1171: * If we successfully made the connection, load the host private key
1172: * in case we will need it later for combined rsa-rhosts
1173: * authentication. This must be done before releasing extra
1174: * privileges, because the file is only readable by root.
1.174 markus 1175: * If we cannot access the private keys, load the public keys
1176: * instead and try to execute the ssh-keysign helper instead.
1.33 markus 1177: */
1.112 markus 1178: sensitive_data.nkeys = 0;
1179: sensitive_data.keys = NULL;
1.173 markus 1180: sensitive_data.external_keysign = 0;
1.178 markus 1181: if (options.rhosts_rsa_authentication ||
1182: options.hostbased_authentication) {
1.397 djm 1183: sensitive_data.nkeys = 9;
1.274 deraadt 1184: sensitive_data.keys = xcalloc(sensitive_data.nkeys,
1.180 deraadt 1185: sizeof(Key));
1.177 markus 1186:
1187: PRIV_START;
1.112 markus 1188: sensitive_data.keys[0] = key_load_private_type(KEY_RSA1,
1.276 dtucker 1189: _PATH_HOST_KEY_FILE, "", NULL, NULL);
1.411 djm 1190: sensitive_data.keys[1] = key_load_private_cert(KEY_ECDSA,
1.349 djm 1191: _PATH_HOST_ECDSA_KEY_FILE, "", NULL);
1.411 djm 1192: sensitive_data.keys[2] = key_load_private_cert(KEY_ED25519,
1193: _PATH_HOST_ED25519_KEY_FILE, "", NULL);
1.349 djm 1194: sensitive_data.keys[3] = key_load_private_cert(KEY_RSA,
1.345 djm 1195: _PATH_HOST_RSA_KEY_FILE, "", NULL);
1.411 djm 1196: sensitive_data.keys[4] = key_load_private_cert(KEY_DSA,
1197: _PATH_HOST_DSA_KEY_FILE, "", NULL);
1198: sensitive_data.keys[5] = key_load_private_type(KEY_ECDSA,
1.349 djm 1199: _PATH_HOST_ECDSA_KEY_FILE, "", NULL, NULL);
1.411 djm 1200: sensitive_data.keys[6] = key_load_private_type(KEY_ED25519,
1201: _PATH_HOST_ED25519_KEY_FILE, "", NULL, NULL);
1.397 djm 1202: sensitive_data.keys[7] = key_load_private_type(KEY_RSA,
1.276 dtucker 1203: _PATH_HOST_RSA_KEY_FILE, "", NULL, NULL);
1.411 djm 1204: sensitive_data.keys[8] = key_load_private_type(KEY_DSA,
1205: _PATH_HOST_DSA_KEY_FILE, "", NULL, NULL);
1.177 markus 1206: PRIV_END;
1.173 markus 1207:
1.181 markus 1208: if (options.hostbased_authentication == 1 &&
1209: sensitive_data.keys[0] == NULL &&
1.349 djm 1210: sensitive_data.keys[5] == NULL &&
1.396 markus 1211: sensitive_data.keys[6] == NULL &&
1.397 djm 1212: sensitive_data.keys[7] == NULL &&
1213: sensitive_data.keys[8] == NULL) {
1.345 djm 1214: sensitive_data.keys[1] = key_load_cert(
1.411 djm 1215: _PATH_HOST_ECDSA_KEY_FILE);
1.345 djm 1216: sensitive_data.keys[2] = key_load_cert(
1.411 djm 1217: _PATH_HOST_ED25519_KEY_FILE);
1.349 djm 1218: sensitive_data.keys[3] = key_load_cert(
1.345 djm 1219: _PATH_HOST_RSA_KEY_FILE);
1.397 djm 1220: sensitive_data.keys[4] = key_load_cert(
1.411 djm 1221: _PATH_HOST_DSA_KEY_FILE);
1.397 djm 1222: sensitive_data.keys[5] = key_load_public(
1.411 djm 1223: _PATH_HOST_ECDSA_KEY_FILE, NULL);
1.397 djm 1224: sensitive_data.keys[6] = key_load_public(
1.411 djm 1225: _PATH_HOST_ED25519_KEY_FILE, NULL);
1.397 djm 1226: sensitive_data.keys[7] = key_load_public(
1.173 markus 1227: _PATH_HOST_RSA_KEY_FILE, NULL);
1.397 djm 1228: sensitive_data.keys[8] = key_load_public(
1.411 djm 1229: _PATH_HOST_DSA_KEY_FILE, NULL);
1.173 markus 1230: sensitive_data.external_keysign = 1;
1231: }
1.31 markus 1232: }
1.33 markus 1233: /*
1234: * Get rid of any extra privileges that we may have. We will no
1235: * longer need them. Also, extra privileges could make it very hard
1236: * to read identity files and other non-world-readable files from the
1237: * user's home directory if it happens to be on a NFS volume where
1238: * root is mapped to nobody.
1239: */
1.225 dtucker 1240: if (original_effective_uid == 0) {
1241: PRIV_START;
1242: permanently_set_uid(pw);
1243: }
1.31 markus 1244:
1.33 markus 1245: /*
1246: * Now that we are back to our own permissions, create ~/.ssh
1.254 djm 1247: * directory if it doesn't already exist.
1.33 markus 1248: */
1.367 djm 1249: if (config == NULL) {
1250: r = snprintf(buf, sizeof buf, "%s%s%s", pw->pw_dir,
1251: strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR);
1252: if (r > 0 && (size_t)r < sizeof(buf) && stat(buf, &st) < 0)
1253: if (mkdir(buf, 0700) < 0)
1254: error("Could not create directory '%.200s'.",
1255: buf);
1256: }
1.31 markus 1257:
1.104 markus 1258: /* load options.identity_files */
1259: load_public_identity_files();
1260:
1261: /* Expand ~ in known host file names. */
1.361 djm 1262: tilde_expand_paths(options.system_hostfiles,
1263: options.num_system_hostfiles);
1264: tilde_expand_paths(options.user_hostfiles, options.num_user_hostfiles);
1.149 markus 1265:
1266: signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
1.352 djm 1267: signal(SIGCHLD, main_sigchld_handler);
1.31 markus 1268:
1.316 djm 1269: /* Log into the remote system. Never returns if the login fails. */
1.303 djm 1270: ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr,
1.355 djm 1271: options.port, pw, timeout_ms);
1.339 djm 1272:
1273: if (packet_connection_is_on_socket()) {
1274: verbose("Authenticated to %s ([%s]:%d).", host,
1275: get_remote_ipaddr(), get_remote_port());
1276: } else {
1277: verbose("Authenticated to %s (via proxy).", host);
1278: }
1.31 markus 1279:
1.112 markus 1280: /* We no longer need the private host keys. Clear them now. */
1281: if (sensitive_data.nkeys != 0) {
1282: for (i = 0; i < sensitive_data.nkeys; i++) {
1283: if (sensitive_data.keys[i] != NULL) {
1284: /* Destroys contents safely */
1285: debug3("clear hostkey %d", i);
1286: key_free(sensitive_data.keys[i]);
1287: sensitive_data.keys[i] = NULL;
1288: }
1289: }
1.378 djm 1290: free(sensitive_data.keys);
1.134 markus 1291: }
1292: for (i = 0; i < options.num_identity_files; i++) {
1.378 djm 1293: free(options.identity_files[i]);
1294: options.identity_files[i] = NULL;
1.134 markus 1295: if (options.identity_keys[i]) {
1296: key_free(options.identity_keys[i]);
1297: options.identity_keys[i] = NULL;
1298: }
1.112 markus 1299: }
1.31 markus 1300:
1.45 markus 1301: exit_status = compat20 ? ssh_session2() : ssh_session();
1302: packet_close();
1.186 djm 1303:
1.312 djm 1304: if (options.control_path != NULL && muxserver_sock != -1)
1.214 djm 1305: unlink(options.control_path);
1306:
1.353 djm 1307: /* Kill ProxyCommand if it is running. */
1308: ssh_kill_proxy_command();
1.186 djm 1309:
1.45 markus 1310: return exit_status;
1311: }
1312:
1.344 djm 1313: static void
1314: control_persist_detach(void)
1315: {
1316: pid_t pid;
1.346 djm 1317: int devnull;
1.344 djm 1318:
1319: debug("%s: backgrounding master process", __func__);
1320:
1321: /*
1322: * master (current process) into the background, and make the
1323: * foreground process a client of the backgrounded master.
1324: */
1325: switch ((pid = fork())) {
1326: case -1:
1327: fatal("%s: fork: %s", __func__, strerror(errno));
1328: case 0:
1329: /* Child: master process continues mainloop */
1330: break;
1331: default:
1332: /* Parent: set up mux slave to connect to backgrounded master */
1333: debug2("%s: background process is %ld", __func__, (long)pid);
1334: stdin_null_flag = ostdin_null_flag;
1.359 djm 1335: options.request_tty = orequest_tty;
1.344 djm 1336: tty_flag = otty_flag;
1337: close(muxserver_sock);
1338: muxserver_sock = -1;
1.351 markus 1339: options.control_master = SSHCTL_MASTER_NO;
1.344 djm 1340: muxclient(options.control_path);
1341: /* muxclient() doesn't return on success. */
1342: fatal("Failed to connect to new control master");
1343: }
1.346 djm 1344: if ((devnull = open(_PATH_DEVNULL, O_RDWR)) == -1) {
1345: error("%s: open(\"/dev/null\"): %s", __func__,
1346: strerror(errno));
1347: } else {
1348: if (dup2(devnull, STDIN_FILENO) == -1 ||
1349: dup2(devnull, STDOUT_FILENO) == -1)
1350: error("%s: dup2: %s", __func__, strerror(errno));
1351: if (devnull > STDERR_FILENO)
1352: close(devnull);
1353: }
1.381 djm 1354: daemon(1, 1);
1.362 djm 1355: setproctitle("%s [mux]", options.control_path);
1.344 djm 1356: }
1357:
1358: /* Do fork() after authentication. Used by "ssh -f" */
1359: static void
1360: fork_postauth(void)
1361: {
1362: if (need_controlpersist_detach)
1363: control_persist_detach();
1364: debug("forking to background");
1365: fork_after_authentication_flag = 0;
1366: if (daemon(1, 1) < 0)
1367: fatal("daemon() failed: %.200s", strerror(errno));
1368: }
1369:
1.315 djm 1370: /* Callback for remote forward global requests */
1371: static void
1372: ssh_confirm_remote_forward(int type, u_int32_t seq, void *ctxt)
1373: {
1.406 millert 1374: struct Forward *rfwd = (struct Forward *)ctxt;
1.315 djm 1375:
1.324 djm 1376: /* XXX verbose() on failure? */
1.404 markus 1377: debug("remote forward %s for: listen %s%s%d, connect %s:%d",
1.315 djm 1378: type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
1.406 millert 1379: rfwd->listen_path ? rfwd->listen_path :
1380: rfwd->listen_host ? rfwd->listen_host : "",
1381: (rfwd->listen_path || rfwd->listen_host) ? ":" : "",
1382: rfwd->listen_port, rfwd->connect_path ? rfwd->connect_path :
1383: rfwd->connect_host, rfwd->connect_port);
1384: if (rfwd->listen_path == NULL && rfwd->listen_port == 0) {
1.366 markus 1385: if (type == SSH2_MSG_REQUEST_SUCCESS) {
1386: rfwd->allocated_port = packet_get_int();
1387: logit("Allocated port %u for remote forward to %s:%d",
1388: rfwd->allocated_port,
1389: rfwd->connect_host, rfwd->connect_port);
1390: channel_update_permitted_opens(rfwd->handle,
1391: rfwd->allocated_port);
1392: } else {
1393: channel_update_permitted_opens(rfwd->handle, -1);
1394: }
1.324 djm 1395: }
1396:
1.315 djm 1397: if (type == SSH2_MSG_REQUEST_FAILURE) {
1.406 millert 1398: if (options.exit_on_forward_failure) {
1399: if (rfwd->listen_path != NULL)
1400: fatal("Error: remote port forwarding failed "
1401: "for listen path %s", rfwd->listen_path);
1402: else
1403: fatal("Error: remote port forwarding failed "
1404: "for listen port %d", rfwd->listen_port);
1405: } else {
1406: if (rfwd->listen_path != NULL)
1407: logit("Warning: remote port forwarding failed "
1408: "for listen path %s", rfwd->listen_path);
1409: else
1410: logit("Warning: remote port forwarding failed "
1411: "for listen port %d", rfwd->listen_port);
1412: }
1.315 djm 1413: }
1.318 djm 1414: if (++remote_forward_confirms_received == options.num_remote_forwards) {
1.315 djm 1415: debug("All remote forwarding requests processed");
1.344 djm 1416: if (fork_after_authentication_flag)
1417: fork_postauth();
1.318 djm 1418: }
1.315 djm 1419: }
1420:
1.126 itojun 1421: static void
1.331 dtucker 1422: client_cleanup_stdio_fwd(int id, void *arg)
1423: {
1424: debug("stdio forwarding: done");
1425: cleanup_exit(0);
1426: }
1427:
1.368 djm 1428: static void
1.407 djm 1429: ssh_stdio_confirm(int id, int success, void *arg)
1430: {
1431: if (!success)
1432: fatal("stdio forwarding failed");
1433: }
1434:
1435: static void
1.368 djm 1436: ssh_init_stdio_forwarding(void)
1.331 dtucker 1437: {
1438: Channel *c;
1.332 djm 1439: int in, out;
1.331 dtucker 1440:
1.368 djm 1441: if (stdio_forward_host == NULL)
1442: return;
1.384 djm 1443: if (!compat20)
1.368 djm 1444: fatal("stdio forwarding require Protocol 2");
1445:
1446: debug3("%s: %s:%d", __func__, stdio_forward_host, stdio_forward_port);
1.332 djm 1447:
1.368 djm 1448: if ((in = dup(STDIN_FILENO)) < 0 ||
1449: (out = dup(STDOUT_FILENO)) < 0)
1.332 djm 1450: fatal("channel_connect_stdio_fwd: dup() in/out failed");
1.368 djm 1451: if ((c = channel_connect_stdio_fwd(stdio_forward_host,
1452: stdio_forward_port, in, out)) == NULL)
1453: fatal("%s: channel_connect_stdio_fwd failed", __func__);
1.331 dtucker 1454: channel_register_cleanup(c->self, client_cleanup_stdio_fwd, 0);
1.407 djm 1455: channel_register_open_confirm(c->self, ssh_stdio_confirm, NULL);
1.331 dtucker 1456: }
1457:
1458: static void
1.70 markus 1459: ssh_init_forwarding(void)
1460: {
1.86 markus 1461: int success = 0;
1.70 markus 1462: int i;
1.331 dtucker 1463:
1.70 markus 1464: /* Initiate local TCP/IP port forwardings. */
1465: for (i = 0; i < options.num_local_forwards; i++) {
1.232 djm 1466: debug("Local connections to %.200s:%d forwarded to remote "
1467: "address %.200s:%d",
1.406 millert 1468: (options.local_forwards[i].listen_path != NULL) ?
1469: options.local_forwards[i].listen_path :
1.234 deraadt 1470: (options.local_forwards[i].listen_host == NULL) ?
1.406 millert 1471: (options.fwd_opts.gateway_ports ? "*" : "LOCALHOST") :
1.232 djm 1472: options.local_forwards[i].listen_host,
1473: options.local_forwards[i].listen_port,
1.406 millert 1474: (options.local_forwards[i].connect_path != NULL) ?
1475: options.local_forwards[i].connect_path :
1.232 djm 1476: options.local_forwards[i].connect_host,
1477: options.local_forwards[i].connect_port);
1.158 markus 1478: success += channel_setup_local_fwd_listener(
1.406 millert 1479: &options.local_forwards[i], &options.fwd_opts);
1.70 markus 1480: }
1.283 markus 1481: if (i > 0 && success != i && options.exit_on_forward_failure)
1482: fatal("Could not request local forwarding.");
1.86 markus 1483: if (i > 0 && success == 0)
1484: error("Could not request local forwarding.");
1.70 markus 1485:
1486: /* Initiate remote TCP/IP port forwardings. */
1487: for (i = 0; i < options.num_remote_forwards; i++) {
1.232 djm 1488: debug("Remote connections from %.200s:%d forwarded to "
1489: "local address %.200s:%d",
1.406 millert 1490: (options.remote_forwards[i].listen_path != NULL) ?
1491: options.remote_forwards[i].listen_path :
1.248 djm 1492: (options.remote_forwards[i].listen_host == NULL) ?
1.253 djm 1493: "LOCALHOST" : options.remote_forwards[i].listen_host,
1.232 djm 1494: options.remote_forwards[i].listen_port,
1.406 millert 1495: (options.remote_forwards[i].connect_path != NULL) ?
1496: options.remote_forwards[i].connect_path :
1.232 djm 1497: options.remote_forwards[i].connect_host,
1498: options.remote_forwards[i].connect_port);
1.366 markus 1499: options.remote_forwards[i].handle =
1500: channel_request_remote_forwarding(
1.406 millert 1501: &options.remote_forwards[i]);
1.366 markus 1502: if (options.remote_forwards[i].handle < 0) {
1.283 markus 1503: if (options.exit_on_forward_failure)
1504: fatal("Could not request remote forwarding.");
1505: else
1506: logit("Warning: Could not request remote "
1507: "forwarding.");
1.366 markus 1508: } else {
1509: client_register_global_confirm(ssh_confirm_remote_forward,
1510: &options.remote_forwards[i]);
1.283 markus 1511: }
1.70 markus 1512: }
1.301 djm 1513:
1514: /* Initiate tunnel forwarding. */
1515: if (options.tun_open != SSH_TUNMODE_NO) {
1516: if (client_request_tun_fwd(options.tun_open,
1517: options.tun_local, options.tun_remote) == -1) {
1518: if (options.exit_on_forward_failure)
1519: fatal("Could not request tunnel forwarding.");
1520: else
1521: error("Could not request tunnel forwarding.");
1522: }
1523: }
1.70 markus 1524: }
1525:
1.126 itojun 1526: static void
1.70 markus 1527: check_agent_present(void)
1528: {
1.412 djm 1529: int r;
1530:
1.70 markus 1531: if (options.forward_agent) {
1.254 djm 1532: /* Clear agent forwarding if we don't have an agent. */
1.412 djm 1533: if ((r = ssh_get_authentication_socket(NULL)) != 0) {
1.70 markus 1534: options.forward_agent = 0;
1.412 djm 1535: if (r != SSH_ERR_AGENT_NOT_PRESENT)
1536: debug("ssh_get_authentication_socket: %s",
1537: ssh_err(r));
1538: }
1.70 markus 1539: }
1540: }
1541:
1.126 itojun 1542: static int
1.45 markus 1543: ssh_session(void)
1544: {
1545: int type;
1546: int interactive = 0;
1547: int have_tty = 0;
1548: struct winsize ws;
1549: char *cp;
1.243 djm 1550: const char *display;
1.45 markus 1551:
1.31 markus 1552: /* Enable compression if requested. */
1553: if (options.compression) {
1.316 djm 1554: debug("Requesting compression at level %d.",
1555: options.compression_level);
1.31 markus 1556:
1.316 djm 1557: if (options.compression_level < 1 ||
1558: options.compression_level > 9)
1559: fatal("Compression level must be from 1 (fast) to "
1560: "9 (slow, best).");
1.31 markus 1561:
1562: /* Send the request. */
1563: packet_start(SSH_CMSG_REQUEST_COMPRESSION);
1564: packet_put_int(options.compression_level);
1565: packet_send();
1566: packet_write_wait();
1.156 markus 1567: type = packet_read();
1.31 markus 1568: if (type == SSH_SMSG_SUCCESS)
1569: packet_start_compression(options.compression_level);
1570: else if (type == SSH_SMSG_FAILURE)
1.191 itojun 1571: logit("Warning: Remote host refused compression.");
1.31 markus 1572: else
1.316 djm 1573: packet_disconnect("Protocol error waiting for "
1574: "compression response.");
1.31 markus 1575: }
1576: /* Allocate a pseudo tty if appropriate. */
1577: if (tty_flag) {
1578: debug("Requesting pty.");
1579:
1580: /* Start the packet. */
1581: packet_start(SSH_CMSG_REQUEST_PTY);
1582:
1583: /* Store TERM in the packet. There is no limit on the
1584: length of the string. */
1585: cp = getenv("TERM");
1586: if (!cp)
1587: cp = "";
1.124 markus 1588: packet_put_cstring(cp);
1.31 markus 1589:
1590: /* Store window size in the packet. */
1591: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
1592: memset(&ws, 0, sizeof(ws));
1.269 deraadt 1593: packet_put_int((u_int)ws.ws_row);
1594: packet_put_int((u_int)ws.ws_col);
1595: packet_put_int((u_int)ws.ws_xpixel);
1596: packet_put_int((u_int)ws.ws_ypixel);
1.31 markus 1597:
1598: /* Store tty modes in the packet. */
1.115 stevesk 1599: tty_make_modes(fileno(stdin), NULL);
1.31 markus 1600:
1601: /* Send the packet, and wait for it to leave. */
1602: packet_send();
1603: packet_write_wait();
1604:
1605: /* Read response from the server. */
1.156 markus 1606: type = packet_read();
1.43 markus 1607: if (type == SSH_SMSG_SUCCESS) {
1.31 markus 1608: interactive = 1;
1.45 markus 1609: have_tty = 1;
1.43 markus 1610: } else if (type == SSH_SMSG_FAILURE)
1.316 djm 1611: logit("Warning: Remote host failed or refused to "
1612: "allocate a pseudo tty.");
1.31 markus 1613: else
1.316 djm 1614: packet_disconnect("Protocol error waiting for pty "
1615: "request response.");
1.31 markus 1616: }
1617: /* Request X11 forwarding if enabled and DISPLAY is set. */
1.243 djm 1618: display = getenv("DISPLAY");
1619: if (options.forward_x11 && display != NULL) {
1.150 stevesk 1620: char *proto, *data;
1.50 markus 1621: /* Get reasonable local authentication information. */
1.243 djm 1622: client_x11_get_proto(display, options.xauth_location,
1.384 djm 1623: options.forward_x11_trusted,
1.340 djm 1624: options.forward_x11_timeout,
1625: &proto, &data);
1.50 markus 1626: /* Request forwarding with authentication spoofing. */
1.316 djm 1627: debug("Requesting X11 forwarding with authentication "
1628: "spoofing.");
1.363 djm 1629: x11_request_forwarding_with_spoofing(0, display, proto,
1630: data, 0);
1.31 markus 1631: /* Read response from the server. */
1.156 markus 1632: type = packet_read();
1.31 markus 1633: if (type == SSH_SMSG_SUCCESS) {
1634: interactive = 1;
1.50 markus 1635: } else if (type == SSH_SMSG_FAILURE) {
1.191 itojun 1636: logit("Warning: Remote host denied X11 forwarding.");
1.50 markus 1637: } else {
1.316 djm 1638: packet_disconnect("Protocol error waiting for X11 "
1639: "forwarding");
1.50 markus 1640: }
1.31 markus 1641: }
1642: /* Tell the packet module whether this is an interactive session. */
1.354 djm 1643: packet_set_interactive(interactive,
1644: options.ip_qos_interactive, options.ip_qos_bulk);
1.31 markus 1645:
1646: /* Request authentication agent forwarding if appropriate. */
1.70 markus 1647: check_agent_present();
1648:
1.31 markus 1649: if (options.forward_agent) {
1650: debug("Requesting authentication agent forwarding.");
1651: auth_request_forwarding();
1652:
1653: /* Read response from the server. */
1.156 markus 1654: type = packet_read();
1.155 markus 1655: packet_check_eom();
1.31 markus 1656: if (type != SSH_SMSG_SUCCESS)
1.191 itojun 1657: logit("Warning: Remote host denied authentication agent forwarding.");
1.31 markus 1658: }
1659:
1.70 markus 1660: /* Initiate port forwardings. */
1.368 djm 1661: ssh_init_stdio_forwarding();
1.70 markus 1662: ssh_init_forwarding();
1.305 dtucker 1663:
1664: /* Execute a local command */
1665: if (options.local_command != NULL &&
1666: options.permit_local_command)
1667: ssh_local_cmd(options.local_command);
1.34 markus 1668:
1.318 djm 1669: /*
1670: * If requested and we are not interested in replies to remote
1671: * forwarding requests, then let ssh continue in the background.
1672: */
1.344 djm 1673: if (fork_after_authentication_flag) {
1674: if (options.exit_on_forward_failure &&
1675: options.num_remote_forwards > 0) {
1676: debug("deferring postauth fork until remote forward "
1677: "confirmation received");
1678: } else
1679: fork_postauth();
1.318 djm 1680: }
1.31 markus 1681:
1.33 markus 1682: /*
1683: * If a command was specified on the command line, execute the
1684: * command now. Otherwise request the server to start a shell.
1685: */
1.31 markus 1686: if (buffer_len(&command) > 0) {
1687: int len = buffer_len(&command);
1688: if (len > 900)
1689: len = 900;
1.316 djm 1690: debug("Sending command: %.*s", len,
1691: (u_char *)buffer_ptr(&command));
1.31 markus 1692: packet_start(SSH_CMSG_EXEC_CMD);
1693: packet_put_string(buffer_ptr(&command), buffer_len(&command));
1694: packet_send();
1695: packet_write_wait();
1696: } else {
1697: debug("Requesting shell.");
1698: packet_start(SSH_CMSG_EXEC_SHELL);
1699: packet_send();
1700: packet_write_wait();
1701: }
1702:
1703: /* Enter the interactive session. */
1.119 stevesk 1704: return client_loop(have_tty, tty_flag ?
1705: options.escape_char : SSH_ESCAPECHAR_NONE, 0);
1.89 markus 1706: }
1707:
1.214 djm 1708: /* request pty/x11/agent/tcpfwd/shell for channel */
1709: static void
1.337 djm 1710: ssh_session2_setup(int id, int success, void *arg)
1.214 djm 1711: {
1.215 djm 1712: extern char **environ;
1.243 djm 1713: const char *display;
1714: int interactive = tty_flag;
1.337 djm 1715:
1716: if (!success)
1717: return; /* No need for error message, channels code sens one */
1.215 djm 1718:
1.248 djm 1719: display = getenv("DISPLAY");
1.243 djm 1720: if (options.forward_x11 && display != NULL) {
1.150 stevesk 1721: char *proto, *data;
1.50 markus 1722: /* Get reasonable local authentication information. */
1.243 djm 1723: client_x11_get_proto(display, options.xauth_location,
1.340 djm 1724: options.forward_x11_trusted,
1725: options.forward_x11_timeout, &proto, &data);
1.50 markus 1726: /* Request forwarding with authentication spoofing. */
1.316 djm 1727: debug("Requesting X11 forwarding with authentication "
1728: "spoofing.");
1.363 djm 1729: x11_request_forwarding_with_spoofing(id, display, proto,
1730: data, 1);
1731: client_expect_confirm(id, "X11 forwarding", CONFIRM_WARN);
1732: /* XXX exit_on_forward_failure */
1.80 markus 1733: interactive = 1;
1.50 markus 1734: }
1735:
1.70 markus 1736: check_agent_present();
1737: if (options.forward_agent) {
1738: debug("Requesting authentication agent forwarding.");
1739: channel_request_start(id, "auth-agent-req@openssh.com", 0);
1740: packet_send();
1.212 djm 1741: }
1.369 dtucker 1742:
1743: /* Tell the packet module whether this is an interactive session. */
1744: packet_set_interactive(interactive,
1745: options.ip_qos_interactive, options.ip_qos_bulk);
1.212 djm 1746:
1.214 djm 1747: client_session2_setup(id, tty_flag, subsystem_flag, getenv("TERM"),
1.311 djm 1748: NULL, fileno(stdin), &command, environ);
1.45 markus 1749: }
1750:
1.143 markus 1751: /* open new channel for a session */
1.126 itojun 1752: static int
1.143 markus 1753: ssh_session2_open(void)
1.45 markus 1754: {
1.118 markus 1755: Channel *c;
1756: int window, packetmax, in, out, err;
1.60 markus 1757:
1.62 markus 1758: if (stdin_null_flag) {
1.93 itojun 1759: in = open(_PATH_DEVNULL, O_RDONLY);
1.62 markus 1760: } else {
1761: in = dup(STDIN_FILENO);
1762: }
1.60 markus 1763: out = dup(STDOUT_FILENO);
1764: err = dup(STDERR_FILENO);
1.45 markus 1765:
1766: if (in < 0 || out < 0 || err < 0)
1.62 markus 1767: fatal("dup() in/out/err failed");
1.45 markus 1768:
1.69 markus 1769: /* enable nonblocking unless tty */
1770: if (!isatty(in))
1771: set_nonblock(in);
1772: if (!isatty(out))
1773: set_nonblock(out);
1774: if (!isatty(err))
1775: set_nonblock(err);
1776:
1.65 markus 1777: window = CHAN_SES_WINDOW_DEFAULT;
1778: packetmax = CHAN_SES_PACKET_DEFAULT;
1.164 markus 1779: if (tty_flag) {
1780: window >>= 1;
1781: packetmax >>= 1;
1.45 markus 1782: }
1.118 markus 1783: c = channel_new(
1.45 markus 1784: "session", SSH_CHANNEL_OPENING, in, out, err,
1.65 markus 1785: window, packetmax, CHAN_EXTENDED_WRITE,
1.192 markus 1786: "client-session", /*nonblock*/0);
1.45 markus 1787:
1.143 markus 1788: debug3("ssh_session2_open: channel_new: %d", c->self);
1.106 markus 1789:
1.122 markus 1790: channel_send_open(c->self);
1.143 markus 1791: if (!no_shell_flag)
1.310 djm 1792: channel_register_open_confirm(c->self,
1793: ssh_session2_setup, NULL);
1.106 markus 1794:
1.118 markus 1795: return c->self;
1.106 markus 1796: }
1797:
1.126 itojun 1798: static int
1.106 markus 1799: ssh_session2(void)
1800: {
1.143 markus 1801: int id = -1;
1.106 markus 1802:
1803: /* XXX should be pre-session */
1.368 djm 1804: if (!options.control_persist)
1805: ssh_init_stdio_forwarding();
1.106 markus 1806: ssh_init_forwarding();
1807:
1.344 djm 1808: /* Start listening for multiplex clients */
1809: muxserver_listen();
1810:
1811: /*
1.368 djm 1812: * If we are in control persist mode and have a working mux listen
1813: * socket, then prepare to background ourselves and have a foreground
1814: * client attach as a control slave.
1815: * NB. we must save copies of the flags that we override for
1.344 djm 1816: * the backgrounding, since we defer attachment of the slave until
1817: * after the connection is fully established (in particular,
1818: * async rfwd replies have been received for ExitOnForwardFailure).
1819: */
1820: if (options.control_persist && muxserver_sock != -1) {
1821: ostdin_null_flag = stdin_null_flag;
1822: ono_shell_flag = no_shell_flag;
1.359 djm 1823: orequest_tty = options.request_tty;
1.344 djm 1824: otty_flag = tty_flag;
1825: stdin_null_flag = 1;
1826: no_shell_flag = 1;
1827: tty_flag = 0;
1828: if (!fork_after_authentication_flag)
1829: need_controlpersist_detach = 1;
1830: fork_after_authentication_flag = 1;
1831: }
1.368 djm 1832: /*
1833: * ControlPersist mux listen socket setup failed, attempt the
1834: * stdio forward setup that we skipped earlier.
1835: */
1836: if (options.control_persist && muxserver_sock == -1)
1837: ssh_init_stdio_forwarding();
1.344 djm 1838:
1.143 markus 1839: if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN))
1840: id = ssh_session2_open();
1.379 djm 1841: else {
1842: packet_set_interactive(
1843: options.control_master == SSHCTL_MASTER_NO,
1844: options.ip_qos_interactive, options.ip_qos_bulk);
1845: }
1.314 djm 1846:
1847: /* If we don't expect to open a new session, then disallow it */
1.319 markus 1848: if (options.control_master == SSHCTL_MASTER_NO &&
1849: (datafellows & SSH_NEW_OPENSSH)) {
1.314 djm 1850: debug("Requesting no-more-sessions@openssh.com");
1851: packet_start(SSH2_MSG_GLOBAL_REQUEST);
1852: packet_put_cstring("no-more-sessions@openssh.com");
1853: packet_put_char(0);
1854: packet_send();
1855: }
1.255 reyk 1856:
1857: /* Execute a local command */
1858: if (options.local_command != NULL &&
1859: options.permit_local_command)
1860: ssh_local_cmd(options.local_command);
1.301 djm 1861:
1.342 djm 1862: /*
1863: * If requested and we are not interested in replies to remote
1864: * forwarding requests, then let ssh continue in the background.
1865: */
1.344 djm 1866: if (fork_after_authentication_flag) {
1867: if (options.exit_on_forward_failure &&
1868: options.num_remote_forwards > 0) {
1869: debug("deferring postauth fork until remote forward "
1870: "confirmation received");
1871: } else
1872: fork_postauth();
1.318 djm 1873: }
1.327 andreas 1874:
1875: if (options.use_roaming)
1876: request_roaming();
1.31 markus 1877:
1.119 stevesk 1878: return client_loop(tty_flag, tty_flag ?
1879: options.escape_char : SSH_ESCAPECHAR_NONE, id);
1.72 markus 1880: }
1881:
1.126 itojun 1882: static void
1.104 markus 1883: load_public_identity_files(void)
1884: {
1.275 djm 1885: char *filename, *cp, thishost[NI_MAXHOST];
1.306 deraadt 1886: char *pwdir = NULL, *pwname = NULL;
1.167 markus 1887: int i = 0;
1.104 markus 1888: Key *public;
1.275 djm 1889: struct passwd *pw;
1.335 djm 1890: u_int n_ids;
1891: char *identity_files[SSH_MAX_IDENTITY_FILES];
1892: Key *identity_keys[SSH_MAX_IDENTITY_FILES];
1.333 markus 1893: #ifdef ENABLE_PKCS11
1.167 markus 1894: Key **keys;
1.333 markus 1895: int nkeys;
1.335 djm 1896: #endif /* PKCS11 */
1.104 markus 1897:
1.335 djm 1898: n_ids = 0;
1.398 tedu 1899: memset(identity_files, 0, sizeof(identity_files));
1900: memset(identity_keys, 0, sizeof(identity_keys));
1.335 djm 1901:
1902: #ifdef ENABLE_PKCS11
1.333 markus 1903: if (options.pkcs11_provider != NULL &&
1.167 markus 1904: options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
1.333 markus 1905: (pkcs11_init(!options.batch_mode) == 0) &&
1906: (nkeys = pkcs11_add_provider(options.pkcs11_provider, NULL,
1907: &keys)) > 0) {
1908: for (i = 0; i < nkeys; i++) {
1.335 djm 1909: if (n_ids >= SSH_MAX_IDENTITY_FILES) {
1910: key_free(keys[i]);
1911: continue;
1912: }
1913: identity_keys[n_ids] = keys[i];
1914: identity_files[n_ids] =
1.333 markus 1915: xstrdup(options.pkcs11_provider); /* XXX */
1.335 djm 1916: n_ids++;
1.167 markus 1917: }
1.378 djm 1918: free(keys);
1.127 markus 1919: }
1.333 markus 1920: #endif /* ENABLE_PKCS11 */
1.275 djm 1921: if ((pw = getpwuid(original_real_uid)) == NULL)
1922: fatal("load_public_identity_files: getpwuid failed");
1.307 dtucker 1923: pwname = xstrdup(pw->pw_name);
1924: pwdir = xstrdup(pw->pw_dir);
1.275 djm 1925: if (gethostname(thishost, sizeof(thishost)) == -1)
1926: fatal("load_public_identity_files: gethostname: %s",
1927: strerror(errno));
1.335 djm 1928: for (i = 0; i < options.num_identity_files; i++) {
1.373 djm 1929: if (n_ids >= SSH_MAX_IDENTITY_FILES ||
1930: strcasecmp(options.identity_files[i], "none") == 0) {
1.378 djm 1931: free(options.identity_files[i]);
1.335 djm 1932: continue;
1933: }
1.275 djm 1934: cp = tilde_expand_filename(options.identity_files[i],
1.131 millert 1935: original_real_uid);
1.306 deraadt 1936: filename = percent_expand(cp, "d", pwdir,
1937: "u", pwname, "l", thishost, "h", host,
1.275 djm 1938: "r", options.user, (char *)NULL);
1.378 djm 1939: free(cp);
1.131 millert 1940: public = key_load_public(filename, NULL);
1941: debug("identity file %s type %d", filename,
1942: public ? public->type : -1);
1.378 djm 1943: free(options.identity_files[i]);
1.335 djm 1944: identity_files[n_ids] = filename;
1945: identity_keys[n_ids] = public;
1946:
1947: if (++n_ids >= SSH_MAX_IDENTITY_FILES)
1948: continue;
1949:
1950: /* Try to add the certificate variant too */
1951: xasprintf(&cp, "%s-cert", filename);
1952: public = key_load_public(cp, NULL);
1953: debug("identity file %s type %d", cp,
1954: public ? public->type : -1);
1955: if (public == NULL) {
1.378 djm 1956: free(cp);
1.335 djm 1957: continue;
1958: }
1959: if (!key_is_cert(public)) {
1960: debug("%s: key %s type %s is not a certificate",
1961: __func__, cp, key_type(public));
1962: key_free(public);
1.378 djm 1963: free(cp);
1.335 djm 1964: continue;
1965: }
1966: identity_keys[n_ids] = public;
1967: /* point to the original path, most likely the private key */
1968: identity_files[n_ids] = xstrdup(filename);
1969: n_ids++;
1970: }
1971: options.num_identity_files = n_ids;
1972: memcpy(options.identity_files, identity_files, sizeof(identity_files));
1973: memcpy(options.identity_keys, identity_keys, sizeof(identity_keys));
1974:
1.398 tedu 1975: explicit_bzero(pwname, strlen(pwname));
1.378 djm 1976: free(pwname);
1.398 tedu 1977: explicit_bzero(pwdir, strlen(pwdir));
1.378 djm 1978: free(pwdir);
1.214 djm 1979: }
1.352 djm 1980:
1981: static void
1982: main_sigchld_handler(int sig)
1983: {
1984: int save_errno = errno;
1985: pid_t pid;
1986: int status;
1987:
1988: while ((pid = waitpid(-1, &status, WNOHANG)) > 0 ||
1989: (pid < 0 && errno == EINTR))
1990: ;
1991:
1992: signal(sig, main_sigchld_handler);
1993: errno = save_errno;
1994: }
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