Annotation of src/usr.bin/ssh/ssh.c, Revision 1.450
1.450 ! djm 1: /* $OpenBSD: ssh.c,v 1.449 2017/02/17 02:04:15 djm Exp $ */
1.1 deraadt 2: /*
1.32 deraadt 3: * Author: Tatu Ylonen <ylo@cs.hut.fi>
4: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5: * All rights reserved
6: * Ssh client program. This program can be used to log into a remote machine.
7: * The software supports strong authentication, encryption, and forwarding
8: * of X11, TCP/IP, and authentication connections.
9: *
1.64 deraadt 10: * As far as I am concerned, the code I have written for this software
11: * can be used freely for any purpose. Any derived versions of this
12: * software must be clearly marked as such, and if the derived work is
13: * incompatible with the protocol description in the RFC file, it must be
14: * called by a name other than "ssh" or "Secure Shell".
15: *
16: * Copyright (c) 1999 Niels Provos. All rights reserved.
1.202 markus 17: * Copyright (c) 2000, 2001, 2002, 2003 Markus Friedl. All rights reserved.
1.64 deraadt 18: *
19: * Modified to work with SSL by Niels Provos <provos@citi.umich.edu>
20: * in Canada (German citizen).
21: *
22: * Redistribution and use in source and binary forms, with or without
23: * modification, are permitted provided that the following conditions
24: * are met:
25: * 1. Redistributions of source code must retain the above copyright
26: * notice, this list of conditions and the following disclaimer.
27: * 2. Redistributions in binary form must reproduce the above copyright
28: * notice, this list of conditions and the following disclaimer in the
29: * documentation and/or other materials provided with the distribution.
30: *
31: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
32: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
33: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
34: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
35: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
36: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
37: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
38: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
39: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
40: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.32 deraadt 41: */
1.1 deraadt 42:
1.293 deraadt 43: #include <sys/types.h>
1.312 djm 44: #include <sys/ioctl.h>
45: #include <sys/queue.h>
1.259 stevesk 46: #include <sys/resource.h>
1.280 stevesk 47: #include <sys/socket.h>
1.264 stevesk 48: #include <sys/stat.h>
1.312 djm 49: #include <sys/time.h>
1.352 djm 50: #include <sys/wait.h>
1.258 stevesk 51:
1.265 stevesk 52: #include <ctype.h>
1.285 stevesk 53: #include <errno.h>
1.281 stevesk 54: #include <fcntl.h>
1.286 stevesk 55: #include <netdb.h>
1.258 stevesk 56: #include <paths.h>
1.279 stevesk 57: #include <pwd.h>
1.263 stevesk 58: #include <signal.h>
1.287 stevesk 59: #include <stddef.h>
1.291 stevesk 60: #include <stdio.h>
1.290 stevesk 61: #include <stdlib.h>
1.289 stevesk 62: #include <string.h>
1.288 stevesk 63: #include <unistd.h>
1.414 deraadt 64: #include <limits.h>
1.445 djm 65: #include <locale.h>
1.49 markus 66:
1.402 markus 67: #ifdef WITH_OPENSSL
1.49 markus 68: #include <openssl/evp.h>
1.72 markus 69: #include <openssl/err.h>
1.402 markus 70: #endif
1.1 deraadt 71:
1.293 deraadt 72: #include "xmalloc.h"
1.84 markus 73: #include "ssh.h"
74: #include "ssh1.h"
75: #include "ssh2.h"
1.341 djm 76: #include "canohost.h"
1.84 markus 77: #include "compat.h"
78: #include "cipher.h"
1.405 djm 79: #include "digest.h"
1.1 deraadt 80: #include "packet.h"
81: #include "buffer.h"
1.123 markus 82: #include "channels.h"
1.49 markus 83: #include "key.h"
1.58 markus 84: #include "authfd.h"
1.49 markus 85: #include "authfile.h"
1.83 markus 86: #include "pathnames.h"
1.214 djm 87: #include "dispatch.h"
1.81 markus 88: #include "clientloop.h"
1.84 markus 89: #include "log.h"
1.406 millert 90: #include "misc.h"
1.84 markus 91: #include "readconf.h"
92: #include "sshconnect.h"
1.95 markus 93: #include "kex.h"
94: #include "mac.h"
1.213 deraadt 95: #include "sshpty.h"
1.212 djm 96: #include "match.h"
1.214 djm 97: #include "msg.h"
1.225 dtucker 98: #include "uidswap.h"
1.278 stevesk 99: #include "version.h"
1.412 djm 100: #include "ssherr.h"
1.420 djm 101: #include "myproposal.h"
1.49 markus 102:
1.333 markus 103: #ifdef ENABLE_PKCS11
104: #include "ssh-pkcs11.h"
1.137 jakob 105: #endif
1.127 markus 106:
1.49 markus 107: extern char *__progname;
1.1 deraadt 108:
1.316 djm 109: /* Flag indicating whether debug mode is on. May be set on the command line. */
1.1 deraadt 110: int debug_flag = 0;
111:
1.359 djm 112: /* Flag indicating whether a tty should be requested */
1.1 deraadt 113: int tty_flag = 0;
114:
1.45 markus 115: /* don't exec a shell */
116: int no_shell_flag = 0;
117:
1.33 markus 118: /*
119: * Flag indicating that nothing should be read from stdin. This can be set
120: * on the command line.
121: */
1.1 deraadt 122: int stdin_null_flag = 0;
123:
1.33 markus 124: /*
1.344 djm 125: * Flag indicating that the current process should be backgrounded and
126: * a new slave launched in the foreground for ControlPersist.
127: */
128: int need_controlpersist_detach = 0;
129:
130: /* Copies of flags for ControlPersist foreground slave */
1.359 djm 131: int ostdin_null_flag, ono_shell_flag, otty_flag, orequest_tty;
1.344 djm 132:
133: /*
1.33 markus 134: * Flag indicating that ssh should fork after authentication. This is useful
1.172 deraadt 135: * so that the passphrase can be entered manually, and then ssh goes to the
1.33 markus 136: * background.
137: */
1.1 deraadt 138: int fork_after_authentication_flag = 0;
139:
1.33 markus 140: /*
141: * General data structure for command line options and options configurable
142: * in configuration files. See readconf.h.
143: */
1.1 deraadt 144: Options options;
145:
1.139 markus 146: /* optional user configfile */
147: char *config = NULL;
148:
1.33 markus 149: /*
150: * Name of the host we are connecting to. This is the name given on the
151: * command line, or the HostName specified for the user-supplied name in a
152: * configuration file.
153: */
1.1 deraadt 154: char *host;
155:
1.22 provos 156: /* socket address the host resolves to */
1.37 markus 157: struct sockaddr_storage hostaddr;
1.1 deraadt 158:
1.112 markus 159: /* Private host keys. */
1.173 markus 160: Sensitive sensitive_data;
1.1 deraadt 161:
1.10 dugsong 162: /* Original real UID. */
163: uid_t original_real_uid;
1.177 markus 164: uid_t original_effective_uid;
1.1 deraadt 165:
1.45 markus 166: /* command to be executed */
167: Buffer command;
168:
1.85 djm 169: /* Should we execute a command or invoke a subsystem? */
170: int subsystem_flag = 0;
171:
1.170 markus 172: /* # of replies received for global requests */
1.315 djm 173: static int remote_forward_confirms_received = 0;
1.170 markus 174:
1.313 djm 175: /* mux.c */
176: extern int muxserver_sock;
177: extern u_int muxclient_command;
178:
1.1 deraadt 179: /* Prints a help message to the user. This function never returns. */
180:
1.126 itojun 181: static void
1.93 itojun 182: usage(void)
1.1 deraadt 183: {
1.208 markus 184: fprintf(stderr,
1.409 jmc 185: "usage: ssh [-1246AaCfGgKkMNnqsTtVvXxYy] [-b bind_address] [-c cipher_spec]\n"
1.375 dtucker 186: " [-D [bind_address:]port] [-E log_file] [-e escape_char]\n"
1.444 jmc 187: " [-F configfile] [-I pkcs11] [-i identity_file]\n"
188: " [-J [user@]host[:port]] [-L address] [-l login_name] [-m mac_spec]\n"
189: " [-O ctl_cmd] [-o option] [-p port] [-Q query_option] [-R address]\n"
190: " [-S ctl_path] [-W host:port] [-w local_tun[:remote_tun]]\n"
191: " [user@]hostname [command]\n"
1.208 markus 192: );
1.257 dtucker 193: exit(255);
1.1 deraadt 194: }
195:
1.126 itojun 196: static int ssh_session(void);
197: static int ssh_session2(void);
198: static void load_public_identity_files(void);
1.352 djm 199: static void main_sigchld_handler(int);
1.312 djm 200:
1.361 djm 201: /* ~/ expand a list of paths. NB. assumes path[n] is heap-allocated. */
202: static void
203: tilde_expand_paths(char **paths, u_int num_paths)
204: {
205: u_int i;
206: char *cp;
207:
208: for (i = 0; i < num_paths; i++) {
209: cp = tilde_expand_filename(paths[i], original_real_uid);
1.378 djm 210: free(paths[i]);
1.361 djm 211: paths[i] = cp;
212: }
213: }
214:
1.400 djm 215: /*
216: * Attempt to resolve a host name / port to a set of addresses and
217: * optionally return any CNAMEs encountered along the way.
218: * Returns NULL on failure.
219: * NB. this function must operate with a options having undefined members.
220: */
1.385 djm 221: static struct addrinfo *
1.400 djm 222: resolve_host(const char *name, int port, int logerr, char *cname, size_t clen)
1.385 djm 223: {
224: char strport[NI_MAXSERV];
225: struct addrinfo hints, *res;
226: int gaierr, loglevel = SYSLOG_LEVEL_DEBUG1;
227:
1.400 djm 228: if (port <= 0)
229: port = default_ssh_port();
230:
1.427 djm 231: snprintf(strport, sizeof strport, "%d", port);
1.398 tedu 232: memset(&hints, 0, sizeof(hints));
1.400 djm 233: hints.ai_family = options.address_family == -1 ?
234: AF_UNSPEC : options.address_family;
1.385 djm 235: hints.ai_socktype = SOCK_STREAM;
236: if (cname != NULL)
237: hints.ai_flags = AI_CANONNAME;
238: if ((gaierr = getaddrinfo(name, strport, &hints, &res)) != 0) {
239: if (logerr || (gaierr != EAI_NONAME && gaierr != EAI_NODATA))
240: loglevel = SYSLOG_LEVEL_ERROR;
241: do_log2(loglevel, "%s: Could not resolve hostname %.100s: %s",
242: __progname, name, ssh_gai_strerror(gaierr));
243: return NULL;
244: }
245: if (cname != NULL && res->ai_canonname != NULL) {
246: if (strlcpy(cname, res->ai_canonname, clen) >= clen) {
247: error("%s: host \"%s\" cname \"%s\" too long (max %lu)",
248: __func__, name, res->ai_canonname, (u_long)clen);
249: if (clen > 0)
250: *cname = '\0';
251: }
252: }
253: return res;
254: }
255:
256: /*
1.413 djm 257: * Attempt to resolve a numeric host address / port to a single address.
258: * Returns a canonical address string.
259: * Returns NULL on failure.
260: * NB. this function must operate with a options having undefined members.
261: */
262: static struct addrinfo *
263: resolve_addr(const char *name, int port, char *caddr, size_t clen)
264: {
265: char addr[NI_MAXHOST], strport[NI_MAXSERV];
266: struct addrinfo hints, *res;
267: int gaierr;
268:
269: if (port <= 0)
270: port = default_ssh_port();
271: snprintf(strport, sizeof strport, "%u", port);
272: memset(&hints, 0, sizeof(hints));
273: hints.ai_family = options.address_family == -1 ?
274: AF_UNSPEC : options.address_family;
275: hints.ai_socktype = SOCK_STREAM;
276: hints.ai_flags = AI_NUMERICHOST|AI_NUMERICSERV;
277: if ((gaierr = getaddrinfo(name, strport, &hints, &res)) != 0) {
278: debug2("%s: could not resolve name %.100s as address: %s",
279: __func__, name, ssh_gai_strerror(gaierr));
280: return NULL;
281: }
282: if (res == NULL) {
283: debug("%s: getaddrinfo %.100s returned no addresses",
284: __func__, name);
285: return NULL;
286: }
287: if (res->ai_next != NULL) {
288: debug("%s: getaddrinfo %.100s returned multiple addresses",
289: __func__, name);
290: goto fail;
291: }
292: if ((gaierr = getnameinfo(res->ai_addr, res->ai_addrlen,
293: addr, sizeof(addr), NULL, 0, NI_NUMERICHOST)) != 0) {
294: debug("%s: Could not format address for name %.100s: %s",
295: __func__, name, ssh_gai_strerror(gaierr));
296: goto fail;
297: }
298: if (strlcpy(caddr, addr, clen) >= clen) {
299: error("%s: host \"%s\" addr \"%s\" too long (max %lu)",
300: __func__, name, addr, (u_long)clen);
301: if (clen > 0)
302: *caddr = '\0';
303: fail:
304: freeaddrinfo(res);
305: return NULL;
306: }
307: return res;
308: }
309:
310: /*
1.385 djm 311: * Check whether the cname is a permitted replacement for the hostname
312: * and perform the replacement if it is.
1.400 djm 313: * NB. this function must operate with a options having undefined members.
1.385 djm 314: */
315: static int
1.443 djm 316: check_follow_cname(int direct, char **namep, const char *cname)
1.385 djm 317: {
318: int i;
319: struct allowed_cname *rule;
320:
321: if (*cname == '\0' || options.num_permitted_cnames == 0 ||
322: strcmp(*namep, cname) == 0)
323: return 0;
1.386 djm 324: if (options.canonicalize_hostname == SSH_CANONICALISE_NO)
1.385 djm 325: return 0;
326: /*
1.386 djm 327: * Don't attempt to canonicalize names that will be interpreted by
1.443 djm 328: * a proxy or jump host unless the user specifically requests so.
1.385 djm 329: */
1.443 djm 330: if (!direct &&
1.386 djm 331: options.canonicalize_hostname != SSH_CANONICALISE_ALWAYS)
1.385 djm 332: return 0;
333: debug3("%s: check \"%s\" CNAME \"%s\"", __func__, *namep, cname);
334: for (i = 0; i < options.num_permitted_cnames; i++) {
335: rule = options.permitted_cnames + i;
1.418 djm 336: if (match_pattern_list(*namep, rule->source_list, 1) != 1 ||
337: match_pattern_list(cname, rule->target_list, 1) != 1)
1.385 djm 338: continue;
1.386 djm 339: verbose("Canonicalized DNS aliased hostname "
1.385 djm 340: "\"%s\" => \"%s\"", *namep, cname);
341: free(*namep);
342: *namep = xstrdup(cname);
343: return 1;
344: }
345: return 0;
346: }
347:
348: /*
349: * Attempt to resolve the supplied hostname after applying the user's
1.387 djm 350: * canonicalization rules. Returns the address list for the host or NULL
351: * if no name was found after canonicalization.
1.400 djm 352: * NB. this function must operate with a options having undefined members.
1.385 djm 353: */
354: static struct addrinfo *
1.400 djm 355: resolve_canonicalize(char **hostp, int port)
1.385 djm 356: {
1.443 djm 357: int i, direct, ndots;
1.413 djm 358: char *cp, *fullhost, newname[NI_MAXHOST];
1.385 djm 359: struct addrinfo *addrs;
360:
1.386 djm 361: if (options.canonicalize_hostname == SSH_CANONICALISE_NO)
1.385 djm 362: return NULL;
1.400 djm 363:
1.385 djm 364: /*
1.386 djm 365: * Don't attempt to canonicalize names that will be interpreted by
1.385 djm 366: * a proxy unless the user specifically requests so.
367: */
1.443 djm 368: direct = option_clear_or_none(options.proxy_command) &&
369: options.jump_host == NULL;
370: if (!direct &&
1.386 djm 371: options.canonicalize_hostname != SSH_CANONICALISE_ALWAYS)
1.385 djm 372: return NULL;
1.400 djm 373:
1.413 djm 374: /* Try numeric hostnames first */
375: if ((addrs = resolve_addr(*hostp, port,
376: newname, sizeof(newname))) != NULL) {
377: debug2("%s: hostname %.100s is address", __func__, *hostp);
378: if (strcasecmp(*hostp, newname) != 0) {
379: debug2("%s: canonicalised address \"%s\" => \"%s\"",
380: __func__, *hostp, newname);
381: free(*hostp);
382: *hostp = xstrdup(newname);
383: }
384: return addrs;
385: }
386:
1.428 djm 387: /* If domain name is anchored, then resolve it now */
388: if ((*hostp)[strlen(*hostp) - 1] == '.') {
389: debug3("%s: name is fully qualified", __func__);
390: fullhost = xstrdup(*hostp);
391: if ((addrs = resolve_host(fullhost, port, 0,
392: newname, sizeof(newname))) != NULL)
393: goto found;
394: free(fullhost);
395: goto notfound;
396: }
397:
1.387 djm 398: /* Don't apply canonicalization to sufficiently-qualified hostnames */
1.385 djm 399: ndots = 0;
400: for (cp = *hostp; *cp != '\0'; cp++) {
401: if (*cp == '.')
402: ndots++;
403: }
1.386 djm 404: if (ndots > options.canonicalize_max_dots) {
405: debug3("%s: not canonicalizing hostname \"%s\" (max dots %d)",
406: __func__, *hostp, options.canonicalize_max_dots);
1.385 djm 407: return NULL;
408: }
409: /* Attempt each supplied suffix */
410: for (i = 0; i < options.num_canonical_domains; i++) {
1.413 djm 411: *newname = '\0';
1.385 djm 412: xasprintf(&fullhost, "%s.%s.", *hostp,
413: options.canonical_domains[i]);
1.400 djm 414: debug3("%s: attempting \"%s\" => \"%s\"", __func__,
415: *hostp, fullhost);
416: if ((addrs = resolve_host(fullhost, port, 0,
1.413 djm 417: newname, sizeof(newname))) == NULL) {
1.385 djm 418: free(fullhost);
419: continue;
420: }
1.428 djm 421: found:
1.385 djm 422: /* Remove trailing '.' */
423: fullhost[strlen(fullhost) - 1] = '\0';
424: /* Follow CNAME if requested */
1.443 djm 425: if (!check_follow_cname(direct, &fullhost, newname)) {
1.386 djm 426: debug("Canonicalized hostname \"%s\" => \"%s\"",
1.385 djm 427: *hostp, fullhost);
428: }
429: free(*hostp);
430: *hostp = fullhost;
431: return addrs;
432: }
1.428 djm 433: notfound:
1.386 djm 434: if (!options.canonicalize_fallback_local)
1.400 djm 435: fatal("%s: Could not resolve host \"%s\"", __progname, *hostp);
436: debug2("%s: host %s not found in any suffix", __func__, *hostp);
1.385 djm 437: return NULL;
438: }
439:
1.32 deraadt 440: /*
1.400 djm 441: * Read per-user configuration file. Ignore the system wide config
442: * file if the user specifies a config file on the command line.
443: */
444: static void
1.408 djm 445: process_config_files(const char *host_arg, struct passwd *pw, int post_canon)
1.400 djm 446: {
1.414 deraadt 447: char buf[PATH_MAX];
1.400 djm 448: int r;
449:
450: if (config != NULL) {
451: if (strcasecmp(config, "none") != 0 &&
1.408 djm 452: !read_config_file(config, pw, host, host_arg, &options,
453: SSHCONF_USERCONF | (post_canon ? SSHCONF_POSTCANON : 0)))
1.400 djm 454: fatal("Can't open user config file %.100s: "
455: "%.100s", config, strerror(errno));
456: } else {
457: r = snprintf(buf, sizeof buf, "%s/%s", pw->pw_dir,
458: _PATH_SSH_USER_CONFFILE);
459: if (r > 0 && (size_t)r < sizeof(buf))
1.408 djm 460: (void)read_config_file(buf, pw, host, host_arg,
461: &options, SSHCONF_CHECKPERM | SSHCONF_USERCONF |
462: (post_canon ? SSHCONF_POSTCANON : 0));
1.400 djm 463:
464: /* Read systemwide configuration file after user config. */
1.408 djm 465: (void)read_config_file(_PATH_HOST_CONFIG_FILE, pw,
466: host, host_arg, &options,
467: post_canon ? SSHCONF_POSTCANON : 0);
468: }
469: }
470:
471: /* Rewrite the port number in an addrinfo list of addresses */
472: static void
473: set_addrinfo_port(struct addrinfo *addrs, int port)
474: {
475: struct addrinfo *addr;
476:
477: for (addr = addrs; addr != NULL; addr = addr->ai_next) {
478: switch (addr->ai_family) {
479: case AF_INET:
480: ((struct sockaddr_in *)addr->ai_addr)->
481: sin_port = htons(port);
482: break;
483: case AF_INET6:
484: ((struct sockaddr_in6 *)addr->ai_addr)->
485: sin6_port = htons(port);
486: break;
487: }
1.400 djm 488: }
489: }
490:
491: /*
1.32 deraadt 492: * Main program for the ssh client.
493: */
1.2 provos 494: int
495: main(int ac, char **av)
1.1 deraadt 496: {
1.437 djm 497: struct ssh *ssh = NULL;
1.443 djm 498: int i, r, opt, exit_status, use_syslog, direct, config_test = 0;
1.414 deraadt 499: char *p, *cp, *line, *argv0, buf[PATH_MAX], *host_arg, *logfile;
1.358 djm 500: char thishost[NI_MAXHOST], shorthost[NI_MAXHOST], portstr[NI_MAXSERV];
1.423 djm 501: char cname[NI_MAXHOST], uidstr[32], *conn_hash_hex;
1.31 markus 502: struct stat st;
1.98 markus 503: struct passwd *pw;
1.382 djm 504: int timeout_ms;
1.144 stevesk 505: extern int optind, optreset;
506: extern char *optarg;
1.406 millert 507: struct Forward fwd;
1.385 djm 508: struct addrinfo *addrs = NULL;
1.405 djm 509: struct ssh_digest_ctx *md;
510: u_char conn_hash[SSH_DIGEST_MAX_LENGTH];
1.250 djm 511:
1.436 dtucker 512: ssh_malloc_init(); /* must be called before any mallocs */
1.250 djm 513: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
514: sanitise_stdfd();
1.31 markus 515:
1.33 markus 516: /*
1.346 djm 517: * Discard other fds that are hanging around. These can cause problem
518: * with backgrounded ssh processes started by ControlPersist.
519: */
520: closefrom(STDERR_FILENO + 1);
521:
522: /*
1.33 markus 523: * Save the original real uid. It will be needed later (uid-swapping
524: * may clobber the real uid).
525: */
1.31 markus 526: original_real_uid = getuid();
527: original_effective_uid = geteuid();
528:
1.184 stevesk 529: /*
530: * Use uid-swapping to give up root privileges for the duration of
531: * option processing. We will re-instantiate the rights when we are
532: * ready to create the privileged port, and will permanently drop
533: * them when the port has been created (actually, when the connection
534: * has been made, as we may need to create the port several times).
535: */
536: PRIV_END;
537:
1.31 markus 538: /* If we are installed setuid root be careful to not drop core. */
539: if (original_real_uid != original_effective_uid) {
540: struct rlimit rlim;
541: rlim.rlim_cur = rlim.rlim_max = 0;
542: if (setrlimit(RLIMIT_CORE, &rlim) < 0)
543: fatal("setrlimit failed: %.100s", strerror(errno));
1.1 deraadt 544: }
1.107 markus 545: /* Get user data. */
546: pw = getpwuid(original_real_uid);
547: if (!pw) {
1.380 djm 548: logit("No user exists for uid %lu", (u_long)original_real_uid);
1.257 dtucker 549: exit(255);
1.107 markus 550: }
551: /* Take a copy of the returned structure. */
552: pw = pwcopy(pw);
1.31 markus 553:
1.33 markus 554: /*
555: * Set our umask to something reasonable, as some files are created
556: * with the default umask. This will make them world-readable but
557: * writable only by the owner, which is ok for all files for which we
558: * don't set the modes explicitly.
559: */
1.31 markus 560: umask(022);
1.445 djm 561:
562: setlocale(LC_CTYPE, "");
1.31 markus 563:
1.316 djm 564: /*
565: * Initialize option structure to indicate that no values have been
566: * set.
567: */
1.31 markus 568: initialize_options(&options);
569:
570: /* Parse command-line arguments. */
571: host = NULL;
1.320 djm 572: use_syslog = 0;
1.375 dtucker 573: logfile = NULL;
1.325 markus 574: argv0 = av[0];
1.31 markus 575:
1.266 djm 576: again:
1.316 djm 577: while ((opt = getopt(ac, av, "1246ab:c:e:fgi:kl:m:no:p:qstvx"
1.443 djm 578: "ACD:E:F:GI:J:KL:MNO:PQ:R:S:TVw:W:XYy")) != -1) {
1.31 markus 579: switch (opt) {
1.91 jakob 580: case '1':
581: options.protocol = SSH_PROTO_1;
582: break;
1.47 markus 583: case '2':
584: options.protocol = SSH_PROTO_2;
585: break;
1.37 markus 586: case '4':
1.196 djm 587: options.address_family = AF_INET;
1.37 markus 588: break;
589: case '6':
1.196 djm 590: options.address_family = AF_INET6;
1.37 markus 591: break;
1.31 markus 592: case 'n':
593: stdin_null_flag = 1;
594: break;
595: case 'f':
596: fork_after_authentication_flag = 1;
597: stdin_null_flag = 1;
598: break;
599: case 'x':
600: options.forward_x11 = 0;
601: break;
602: case 'X':
603: options.forward_x11 = 1;
604: break;
1.320 djm 605: case 'y':
606: use_syslog = 1;
607: break;
1.375 dtucker 608: case 'E':
1.422 dtucker 609: logfile = optarg;
1.375 dtucker 610: break;
1.408 djm 611: case 'G':
612: config_test = 1;
613: break;
1.202 markus 614: case 'Y':
615: options.forward_x11 = 1;
616: options.forward_x11_trusted = 1;
617: break;
1.31 markus 618: case 'g':
1.406 millert 619: options.fwd_opts.gateway_ports = 1;
1.31 markus 620: break;
1.229 djm 621: case 'O':
1.441 dtucker 622: if (options.stdio_forward_host != NULL)
1.332 djm 623: fatal("Cannot specify multiplexing "
624: "command with -W");
625: else if (muxclient_command != 0)
626: fatal("Multiplexing command already specified");
1.229 djm 627: if (strcmp(optarg, "check") == 0)
1.312 djm 628: muxclient_command = SSHMUX_COMMAND_ALIVE_CHECK;
1.338 markus 629: else if (strcmp(optarg, "forward") == 0)
630: muxclient_command = SSHMUX_COMMAND_FORWARD;
1.229 djm 631: else if (strcmp(optarg, "exit") == 0)
1.312 djm 632: muxclient_command = SSHMUX_COMMAND_TERMINATE;
1.357 djm 633: else if (strcmp(optarg, "stop") == 0)
634: muxclient_command = SSHMUX_COMMAND_STOP;
1.365 djm 635: else if (strcmp(optarg, "cancel") == 0)
636: muxclient_command = SSHMUX_COMMAND_CANCEL_FWD;
1.447 markus 637: else if (strcmp(optarg, "proxy") == 0)
638: muxclient_command = SSHMUX_COMMAND_PROXY;
1.229 djm 639: else
640: fatal("Invalid multiplex command.");
641: break;
1.183 stevesk 642: case 'P': /* deprecated */
1.31 markus 643: options.use_privileged_port = 0;
1.376 djm 644: break;
1.394 deraadt 645: case 'Q':
1.376 djm 646: cp = NULL;
1.394 deraadt 647: if (strcmp(optarg, "cipher") == 0)
1.393 djm 648: cp = cipher_alg_list('\n', 0);
1.394 deraadt 649: else if (strcmp(optarg, "cipher-auth") == 0)
1.393 djm 650: cp = cipher_alg_list('\n', 1);
1.394 deraadt 651: else if (strcmp(optarg, "mac") == 0)
1.392 dtucker 652: cp = mac_alg_list('\n');
1.394 deraadt 653: else if (strcmp(optarg, "kex") == 0)
1.392 dtucker 654: cp = kex_alg_list('\n');
1.394 deraadt 655: else if (strcmp(optarg, "key") == 0)
1.446 djm 656: cp = sshkey_alg_list(0, 0, '\n');
1.396 markus 657: else if (strcmp(optarg, "key-cert") == 0)
1.446 djm 658: cp = sshkey_alg_list(1, 0, '\n');
1.396 markus 659: else if (strcmp(optarg, "key-plain") == 0)
1.446 djm 660: cp = sshkey_alg_list(0, 1, '\n');
1.416 djm 661: else if (strcmp(optarg, "protocol-version") == 0) {
662: #ifdef WITH_SSH1
663: cp = xstrdup("1\n2");
664: #else
665: cp = xstrdup("2");
666: #endif
667: }
1.376 djm 668: if (cp == NULL)
669: fatal("Unsupported query \"%s\"", optarg);
670: printf("%s\n", cp);
671: free(cp);
672: exit(0);
1.31 markus 673: break;
674: case 'a':
675: options.forward_agent = 0;
1.53 markus 676: break;
677: case 'A':
678: options.forward_agent = 1;
1.31 markus 679: break;
680: case 'k':
1.204 dtucker 681: options.gss_deleg_creds = 0;
1.297 djm 682: break;
683: case 'K':
684: options.gss_authentication = 1;
685: options.gss_deleg_creds = 1;
1.31 markus 686: break;
687: case 'i':
1.429 dtucker 688: p = tilde_expand_filename(optarg, original_real_uid);
689: if (stat(p, &st) < 0)
1.128 fgsch 690: fprintf(stderr, "Warning: Identity file %s "
1.429 dtucker 691: "not accessible: %s.\n", p,
1.231 otto 692: strerror(errno));
1.429 dtucker 693: else
694: add_identity_file(&options, NULL, p, 1);
695: free(p);
1.31 markus 696: break;
1.127 markus 697: case 'I':
1.333 markus 698: #ifdef ENABLE_PKCS11
1.422 dtucker 699: free(options.pkcs11_provider);
1.333 markus 700: options.pkcs11_provider = xstrdup(optarg);
1.137 jakob 701: #else
1.333 markus 702: fprintf(stderr, "no support for PKCS#11.\n");
1.137 jakob 703: #endif
1.127 markus 704: break;
1.443 djm 705: case 'J':
706: if (options.jump_host != NULL)
707: fatal("Only a single -J option permitted");
708: if (options.proxy_command != NULL)
709: fatal("Cannot specify -J with ProxyCommand");
710: if (parse_jump(optarg, &options, 1) == -1)
711: fatal("Invalid -J argument");
712: options.proxy_command = xstrdup("none");
713: break;
1.31 markus 714: case 't':
1.359 djm 715: if (options.request_tty == REQUEST_TTY_YES)
716: options.request_tty = REQUEST_TTY_FORCE;
717: else
718: options.request_tty = REQUEST_TTY_YES;
1.31 markus 719: break;
720: case 'v':
1.197 markus 721: if (debug_flag == 0) {
1.66 markus 722: debug_flag = 1;
723: options.log_level = SYSLOG_LEVEL_DEBUG1;
1.197 markus 724: } else {
1.443 djm 725: if (options.log_level < SYSLOG_LEVEL_DEBUG3) {
726: debug_flag++;
1.197 markus 727: options.log_level++;
1.443 djm 728: }
1.197 markus 729: }
1.375 dtucker 730: break;
1.31 markus 731: case 'V':
1.209 markus 732: fprintf(stderr, "%s, %s\n",
1.402 markus 733: SSH_VERSION,
734: #ifdef WITH_OPENSSL
735: SSLeay_version(SSLEAY_VERSION)
736: #else
737: "without OpenSSL"
738: #endif
739: );
1.31 markus 740: if (opt == 'V')
741: exit(0);
742: break;
1.255 reyk 743: case 'w':
1.256 reyk 744: if (options.tun_open == -1)
745: options.tun_open = SSH_TUNMODE_DEFAULT;
1.255 reyk 746: options.tun_local = a2tun(optarg, &options.tun_remote);
1.256 reyk 747: if (options.tun_local == SSH_TUNID_ERR) {
1.316 djm 748: fprintf(stderr,
749: "Bad tun device '%s'\n", optarg);
1.257 dtucker 750: exit(255);
1.255 reyk 751: }
752: break;
1.331 dtucker 753: case 'W':
1.441 dtucker 754: if (options.stdio_forward_host != NULL)
1.332 djm 755: fatal("stdio forward already specified");
756: if (muxclient_command != 0)
757: fatal("Cannot specify stdio forward with -O");
1.331 dtucker 758: if (parse_forward(&fwd, optarg, 1, 0)) {
1.441 dtucker 759: options.stdio_forward_host = fwd.listen_host;
760: options.stdio_forward_port = fwd.listen_port;
1.378 djm 761: free(fwd.connect_host);
1.331 dtucker 762: } else {
763: fprintf(stderr,
764: "Bad stdio forwarding specification '%s'\n",
765: optarg);
766: exit(255);
767: }
1.359 djm 768: options.request_tty = REQUEST_TTY_NO;
1.331 dtucker 769: no_shell_flag = 1;
770: break;
1.31 markus 771: case 'q':
772: options.log_level = SYSLOG_LEVEL_QUIET;
773: break;
774: case 'e':
775: if (optarg[0] == '^' && optarg[2] == 0 &&
1.128 fgsch 776: (u_char) optarg[1] >= 64 &&
777: (u_char) optarg[1] < 128)
1.78 markus 778: options.escape_char = (u_char) optarg[1] & 31;
1.31 markus 779: else if (strlen(optarg) == 1)
1.78 markus 780: options.escape_char = (u_char) optarg[0];
1.31 markus 781: else if (strcmp(optarg, "none") == 0)
1.119 stevesk 782: options.escape_char = SSH_ESCAPECHAR_NONE;
1.31 markus 783: else {
1.128 fgsch 784: fprintf(stderr, "Bad escape character '%s'.\n",
785: optarg);
1.257 dtucker 786: exit(255);
1.31 markus 787: }
788: break;
789: case 'c':
1.420 djm 790: if (ciphers_valid(*optarg == '+' ?
791: optarg + 1 : optarg)) {
1.49 markus 792: /* SSH2 only */
1.422 dtucker 793: free(options.ciphers);
1.49 markus 794: options.ciphers = xstrdup(optarg);
1.224 markus 795: options.cipher = SSH_CIPHER_INVALID;
1.420 djm 796: break;
797: }
798: /* SSH1 only */
799: options.cipher = cipher_number(optarg);
800: if (options.cipher == -1) {
801: fprintf(stderr, "Unknown cipher type '%s'\n",
802: optarg);
803: exit(255);
1.95 markus 804: }
1.420 djm 805: if (options.cipher == SSH_CIPHER_3DES)
806: options.ciphers = xstrdup("3des-cbc");
807: else if (options.cipher == SSH_CIPHER_BLOWFISH)
808: options.ciphers = xstrdup("blowfish-cbc");
809: else
810: options.ciphers = xstrdup(KEX_CLIENT_ENCRYPT);
1.95 markus 811: break;
812: case 'm':
1.422 dtucker 813: if (mac_valid(optarg)) {
814: free(options.macs);
1.95 markus 815: options.macs = xstrdup(optarg);
1.422 dtucker 816: } else {
1.128 fgsch 817: fprintf(stderr, "Unknown mac type '%s'\n",
818: optarg);
1.257 dtucker 819: exit(255);
1.31 markus 820: }
821: break;
1.214 djm 822: case 'M':
1.242 djm 823: if (options.control_master == SSHCTL_MASTER_YES)
824: options.control_master = SSHCTL_MASTER_ASK;
825: else
826: options.control_master = SSHCTL_MASTER_YES;
1.214 djm 827: break;
1.31 markus 828: case 'p':
1.113 stevesk 829: options.port = a2port(optarg);
1.323 djm 830: if (options.port <= 0) {
1.109 markus 831: fprintf(stderr, "Bad port '%s'\n", optarg);
1.257 dtucker 832: exit(255);
1.109 markus 833: }
1.31 markus 834: break;
835: case 'l':
836: options.user = optarg;
837: break;
1.141 stevesk 838:
839: case 'L':
1.324 djm 840: if (parse_forward(&fwd, optarg, 0, 0))
1.232 djm 841: add_local_forward(&options, &fwd);
842: else {
1.128 fgsch 843: fprintf(stderr,
1.232 djm 844: "Bad local forwarding specification '%s'\n",
1.128 fgsch 845: optarg);
1.257 dtucker 846: exit(255);
1.31 markus 847: }
1.232 djm 848: break;
849:
850: case 'R':
1.324 djm 851: if (parse_forward(&fwd, optarg, 0, 1)) {
1.232 djm 852: add_remote_forward(&options, &fwd);
853: } else {
1.128 fgsch 854: fprintf(stderr,
1.232 djm 855: "Bad remote forwarding specification "
856: "'%s'\n", optarg);
1.257 dtucker 857: exit(255);
1.31 markus 858: }
859: break;
1.108 markus 860:
861: case 'D':
1.324 djm 862: if (parse_forward(&fwd, optarg, 1, 0)) {
1.322 stevesk 863: add_local_forward(&options, &fwd);
1.232 djm 864: } else {
1.322 stevesk 865: fprintf(stderr,
866: "Bad dynamic forwarding specification "
867: "'%s'\n", optarg);
1.257 dtucker 868: exit(255);
1.109 markus 869: }
1.108 markus 870: break;
871:
1.31 markus 872: case 'C':
873: options.compression = 1;
874: break;
1.45 markus 875: case 'N':
876: no_shell_flag = 1;
1.359 djm 877: options.request_tty = REQUEST_TTY_NO;
1.45 markus 878: break;
879: case 'T':
1.359 djm 880: options.request_tty = REQUEST_TTY_NO;
1.45 markus 881: break;
1.31 markus 882: case 'o':
1.205 markus 883: line = xstrdup(optarg);
1.408 djm 884: if (process_config_line(&options, pw,
885: host ? host : "", host ? host : "", line,
886: "command-line", 0, NULL, SSHCONF_USERCONF) != 0)
1.257 dtucker 887: exit(255);
1.378 djm 888: free(line);
1.31 markus 889: break;
1.85 djm 890: case 's':
891: subsystem_flag = 1;
1.117 markus 892: break;
1.214 djm 893: case 'S':
1.431 mmcc 894: free(options.control_path);
1.214 djm 895: options.control_path = xstrdup(optarg);
896: break;
1.117 markus 897: case 'b':
898: options.bind_address = optarg;
1.85 djm 899: break;
1.139 markus 900: case 'F':
901: config = optarg;
902: break;
1.31 markus 903: default:
904: usage();
1.1 deraadt 905: }
1.31 markus 906: }
907:
1.128 fgsch 908: ac -= optind;
909: av += optind;
910:
1.329 guenther 911: if (ac > 0 && !host) {
1.188 markus 912: if (strrchr(*av, '@')) {
1.128 fgsch 913: p = xstrdup(*av);
1.188 markus 914: cp = strrchr(p, '@');
1.128 fgsch 915: if (cp == NULL || cp == p)
916: usage();
917: options.user = p;
918: *cp = '\0';
1.385 djm 919: host = xstrdup(++cp);
1.128 fgsch 920: } else
1.385 djm 921: host = xstrdup(*av);
1.189 millert 922: if (ac > 1) {
923: optind = optreset = 1;
1.128 fgsch 924: goto again;
925: }
1.189 millert 926: ac--, av++;
1.128 fgsch 927: }
928:
1.31 markus 929: /* Check that we got a host name. */
930: if (!host)
931: usage();
932:
1.385 djm 933: host_arg = xstrdup(host);
934:
1.402 markus 935: #ifdef WITH_OPENSSL
1.350 djm 936: OpenSSL_add_all_algorithms();
1.72 markus 937: ERR_load_crypto_strings();
1.402 markus 938: #endif
1.31 markus 939:
940: /* Initialize the command to execute on remote host. */
941: buffer_init(&command);
1.1 deraadt 942:
1.33 markus 943: /*
944: * Save the command to execute on the remote host in a buffer. There
945: * is no limit on the length of the command, except by the maximum
946: * packet size. Also sets the tty flag if there is no command.
947: */
1.128 fgsch 948: if (!ac) {
1.31 markus 949: /* No command specified - execute shell on a tty. */
1.85 djm 950: if (subsystem_flag) {
1.128 fgsch 951: fprintf(stderr,
952: "You must specify a subsystem to invoke.\n");
1.85 djm 953: usage();
954: }
1.31 markus 955: } else {
1.128 fgsch 956: /* A command has been specified. Store it into the buffer. */
957: for (i = 0; i < ac; i++) {
958: if (i)
1.31 markus 959: buffer_append(&command, " ", 1);
960: buffer_append(&command, av[i], strlen(av[i]));
961: }
962: }
963:
964: /* Cannot fork to background if no command. */
1.316 djm 965: if (fork_after_authentication_flag && buffer_len(&command) == 0 &&
966: !no_shell_flag)
967: fatal("Cannot fork into background without a command "
968: "to execute.");
1.31 markus 969:
1.101 markus 970: /*
971: * Initialize "log" output. Since we are the client all output
1.375 dtucker 972: * goes to stderr unless otherwise specified by -y or -E.
1.101 markus 973: */
1.375 dtucker 974: if (use_syslog && logfile != NULL)
975: fatal("Can't specify both -y and -E");
1.422 dtucker 976: if (logfile != NULL)
1.375 dtucker 977: log_redirect_stderr_to(logfile);
1.325 markus 978: log_init(argv0,
1.316 djm 979: options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level,
1.320 djm 980: SYSLOG_FACILITY_USER, !use_syslog);
1.375 dtucker 981:
982: if (debug_flag)
1.402 markus 983: logit("%s, %s", SSH_VERSION,
984: #ifdef WITH_OPENSSL
985: SSLeay_version(SSLEAY_VERSION)
986: #else
987: "without OpenSSL"
988: #endif
989: );
1.31 markus 990:
1.400 djm 991: /* Parse the configuration files */
1.408 djm 992: process_config_files(host_arg, pw, 0);
1.400 djm 993:
994: /* Hostname canonicalisation needs a few options filled. */
995: fill_default_options_for_canonicalization(&options);
996:
997: /* If the user has replaced the hostname then take it into use now */
998: if (options.hostname != NULL) {
999: /* NB. Please keep in sync with readconf.c:match_cfg_line() */
1000: cp = percent_expand(options.hostname,
1001: "h", host, (char *)NULL);
1002: free(host);
1003: host = cp;
1.408 djm 1004: free(options.hostname);
1005: options.hostname = xstrdup(host);
1.400 djm 1006: }
1007:
1008: /* If canonicalization requested then try to apply it */
1009: lowercase(host);
1010: if (options.canonicalize_hostname != SSH_CANONICALISE_NO)
1011: addrs = resolve_canonicalize(&host, options.port);
1012:
1.139 markus 1013: /*
1.401 djm 1014: * If CanonicalizePermittedCNAMEs have been specified but
1015: * other canonicalization did not happen (by not being requested
1016: * or by failing with fallback) then the hostname may still be changed
1017: * as a result of CNAME following.
1018: *
1019: * Try to resolve the bare hostname name using the system resolver's
1020: * usual search rules and then apply the CNAME follow rules.
1021: *
1022: * Skip the lookup if a ProxyCommand is being used unless the user
1023: * has specifically requested canonicalisation for this case via
1024: * CanonicalizeHostname=always
1.139 markus 1025: */
1.443 djm 1026: direct = option_clear_or_none(options.proxy_command) &&
1027: options.jump_host == NULL;
1028: if (addrs == NULL && options.num_permitted_cnames != 0 && (direct ||
1029: options.canonicalize_hostname == SSH_CANONICALISE_ALWAYS)) {
1.403 djm 1030: if ((addrs = resolve_host(host, options.port,
1031: option_clear_or_none(options.proxy_command),
1032: cname, sizeof(cname))) == NULL) {
1033: /* Don't fatal proxied host names not in the DNS */
1034: if (option_clear_or_none(options.proxy_command))
1035: cleanup_exit(255); /* logged in resolve_host */
1036: } else
1.443 djm 1037: check_follow_cname(direct, &host, cname);
1.400 djm 1038: }
1.139 markus 1039:
1.400 djm 1040: /*
1.408 djm 1041: * If canonicalisation is enabled then re-parse the configuration
1042: * files as new stanzas may match.
1.400 djm 1043: */
1.408 djm 1044: if (options.canonicalize_hostname != 0) {
1045: debug("Re-reading configuration after hostname "
1046: "canonicalisation");
1047: free(options.hostname);
1048: options.hostname = xstrdup(host);
1049: process_config_files(host_arg, pw, 1);
1050: /*
1051: * Address resolution happens early with canonicalisation
1052: * enabled and the port number may have changed since, so
1053: * reset it in address list
1054: */
1055: if (addrs != NULL && options.port > 0)
1056: set_addrinfo_port(addrs, options.port);
1.139 markus 1057: }
1.31 markus 1058:
1059: /* Fill configuration defaults. */
1060: fill_default_options(&options);
1.443 djm 1061:
1062: /*
1063: * If ProxyJump option specified, then construct a ProxyCommand now.
1064: */
1065: if (options.jump_host != NULL) {
1066: char port_s[8];
1067:
1068: /* Consistency check */
1069: if (options.proxy_command != NULL)
1070: fatal("inconsistent options: ProxyCommand+ProxyJump");
1071: /* Never use FD passing for ProxyJump */
1072: options.proxy_use_fdpass = 0;
1073: snprintf(port_s, sizeof(port_s), "%d", options.jump_port);
1074: xasprintf(&options.proxy_command,
1.450 ! djm 1075: "ssh%s%s%s%s%s%s%s%s%s%.*s -W '[%%h]:%%p' %s",
1.443 djm 1076: /* Optional "-l user" argument if jump_user set */
1077: options.jump_user == NULL ? "" : " -l ",
1078: options.jump_user == NULL ? "" : options.jump_user,
1079: /* Optional "-p port" argument if jump_port set */
1080: options.jump_port <= 0 ? "" : " -p ",
1081: options.jump_port <= 0 ? "" : port_s,
1082: /* Optional additional jump hosts ",..." */
1083: options.jump_extra == NULL ? "" : " -J ",
1084: options.jump_extra == NULL ? "" : options.jump_extra,
1085: /* Optional "-F" argumment if -F specified */
1086: config == NULL ? "" : " -F ",
1087: config == NULL ? "" : config,
1088: /* Optional "-v" arguments if -v set */
1089: debug_flag ? " -" : "",
1090: debug_flag, "vvv",
1091: /* Mandatory hostname */
1092: options.jump_host);
1093: debug("Setting implicit ProxyCommand from ProxyJump: %s",
1094: options.proxy_command);
1095: }
1.31 markus 1096:
1.400 djm 1097: if (options.port == 0)
1098: options.port = default_ssh_port();
1.196 djm 1099: channel_set_af(options.address_family);
1100:
1.383 djm 1101: /* Tidy and check options */
1102: if (options.host_key_alias != NULL)
1103: lowercase(options.host_key_alias);
1104: if (options.proxy_command != NULL &&
1105: strcmp(options.proxy_command, "-") == 0 &&
1106: options.proxy_use_fdpass)
1107: fatal("ProxyCommand=- and ProxyUseFDPass are incompatible");
1.415 djm 1108: if (options.control_persist &&
1109: options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK) {
1110: debug("UpdateHostKeys=ask is incompatible with ControlPersist; "
1111: "disabling");
1112: options.update_hostkeys = 0;
1113: }
1.430 djm 1114: if (options.connection_attempts <= 0)
1115: fatal("Invalid number of ConnectionAttempts");
1116:
1.388 djm 1117: if (original_effective_uid != 0)
1118: options.use_privileged_port = 0;
1.383 djm 1119:
1.31 markus 1120: /* reinit */
1.325 markus 1121: log_init(argv0, options.log_level, SYSLOG_FACILITY_USER, !use_syslog);
1.370 djm 1122:
1123: if (options.request_tty == REQUEST_TTY_YES ||
1124: options.request_tty == REQUEST_TTY_FORCE)
1125: tty_flag = 1;
1126:
1127: /* Allocate a tty by default if no command specified. */
1128: if (buffer_len(&command) == 0)
1129: tty_flag = options.request_tty != REQUEST_TTY_NO;
1130:
1131: /* Force no tty */
1.447 markus 1132: if (options.request_tty == REQUEST_TTY_NO ||
1133: (muxclient_command && muxclient_command != SSHMUX_COMMAND_PROXY))
1.370 djm 1134: tty_flag = 0;
1135: /* Do not allocate a tty if stdin is not a tty. */
1136: if ((!isatty(fileno(stdin)) || stdin_null_flag) &&
1137: options.request_tty != REQUEST_TTY_FORCE) {
1138: if (tty_flag)
1139: logit("Pseudo-terminal will not be allocated because "
1140: "stdin is not a terminal.");
1141: tty_flag = 0;
1142: }
1.31 markus 1143:
1144: if (options.user == NULL)
1145: options.user = xstrdup(pw->pw_name);
1.343 djm 1146:
1.358 djm 1147: if (gethostname(thishost, sizeof(thishost)) == -1)
1148: fatal("gethostname: %s", strerror(errno));
1149: strlcpy(shorthost, thishost, sizeof(shorthost));
1150: shorthost[strcspn(thishost, ".")] = '\0';
1151: snprintf(portstr, sizeof(portstr), "%d", options.port);
1.423 djm 1152: snprintf(uidstr, sizeof(uidstr), "%d", pw->pw_uid);
1.358 djm 1153:
1.405 djm 1154: if ((md = ssh_digest_start(SSH_DIGEST_SHA1)) == NULL ||
1155: ssh_digest_update(md, thishost, strlen(thishost)) < 0 ||
1156: ssh_digest_update(md, host, strlen(host)) < 0 ||
1157: ssh_digest_update(md, portstr, strlen(portstr)) < 0 ||
1158: ssh_digest_update(md, options.user, strlen(options.user)) < 0 ||
1159: ssh_digest_final(md, conn_hash, sizeof(conn_hash)) < 0)
1160: fatal("%s: mux digest failed", __func__);
1161: ssh_digest_free(md);
1162: conn_hash_hex = tohex(conn_hash, ssh_digest_bytes(SSH_DIGEST_SHA1));
1163:
1.317 dtucker 1164: if (options.local_command != NULL) {
1165: debug3("expanding LocalCommand: %s", options.local_command);
1166: cp = options.local_command;
1.405 djm 1167: options.local_command = percent_expand(cp,
1168: "C", conn_hash_hex,
1169: "L", shorthost,
1170: "d", pw->pw_dir,
1171: "h", host,
1172: "l", thishost,
1173: "n", host_arg,
1174: "p", portstr,
1175: "r", options.user,
1176: "u", pw->pw_name,
1.358 djm 1177: (char *)NULL);
1.317 dtucker 1178: debug3("expanded LocalCommand: %s", options.local_command);
1.378 djm 1179: free(cp);
1.304 dtucker 1180: }
1.31 markus 1181:
1.214 djm 1182: if (options.control_path != NULL) {
1.241 djm 1183: cp = tilde_expand_filename(options.control_path,
1184: original_real_uid);
1.378 djm 1185: free(options.control_path);
1.405 djm 1186: options.control_path = percent_expand(cp,
1187: "C", conn_hash_hex,
1188: "L", shorthost,
1189: "h", host,
1190: "l", thishost,
1191: "n", host_arg,
1192: "p", portstr,
1193: "r", options.user,
1194: "u", pw->pw_name,
1.423 djm 1195: "i", uidstr,
1.358 djm 1196: (char *)NULL);
1.378 djm 1197: free(cp);
1.214 djm 1198: }
1.405 djm 1199: free(conn_hash_hex);
1.408 djm 1200:
1201: if (config_test) {
1202: dump_client_config(&options, host);
1203: exit(0);
1204: }
1.405 djm 1205:
1.312 djm 1206: if (muxclient_command != 0 && options.control_path == NULL)
1.240 djm 1207: fatal("No ControlPath specified for \"-O\" command");
1.447 markus 1208: if (options.control_path != NULL) {
1209: int sock;
1210: if ((sock = muxclient(options.control_path)) >= 0) {
1211: packet_set_connection(sock, sock);
1212: ssh = active_state; /* XXX */
1213: enable_compat20(); /* XXX */
1214: packet_set_mux();
1215: goto skip_connect;
1216: }
1217: }
1.401 djm 1218:
1219: /*
1220: * If hostname canonicalisation was not enabled, then we may not
1221: * have yet resolved the hostname. Do so now.
1222: */
1223: if (addrs == NULL && options.proxy_command == NULL) {
1.421 djm 1224: debug2("resolving \"%s\" port %d", host, options.port);
1.401 djm 1225: if ((addrs = resolve_host(host, options.port, 1,
1226: cname, sizeof(cname))) == NULL)
1227: cleanup_exit(255); /* resolve_host logs the error */
1228: }
1.214 djm 1229:
1.303 djm 1230: timeout_ms = options.connection_timeout * 1000;
1231:
1.77 markus 1232: /* Open a connection to the remote host. */
1.385 djm 1233: if (ssh_connect(host, addrs, &hostaddr, options.port,
1234: options.address_family, options.connection_attempts,
1235: &timeout_ms, options.tcp_keep_alive,
1.388 djm 1236: options.use_privileged_port) != 0)
1.257 dtucker 1237: exit(255);
1.31 markus 1238:
1.391 djm 1239: if (addrs != NULL)
1240: freeaddrinfo(addrs);
1241:
1.385 djm 1242: packet_set_timeout(options.server_alive_interval,
1243: options.server_alive_count_max);
1244:
1.437 djm 1245: ssh = active_state; /* XXX */
1246:
1.303 djm 1247: if (timeout_ms > 0)
1248: debug3("timeout: %d ms remain after connect", timeout_ms);
1249:
1.33 markus 1250: /*
1251: * If we successfully made the connection, load the host private key
1252: * in case we will need it later for combined rsa-rhosts
1253: * authentication. This must be done before releasing extra
1254: * privileges, because the file is only readable by root.
1.174 markus 1255: * If we cannot access the private keys, load the public keys
1256: * instead and try to execute the ssh-keysign helper instead.
1.33 markus 1257: */
1.112 markus 1258: sensitive_data.nkeys = 0;
1259: sensitive_data.keys = NULL;
1.173 markus 1260: sensitive_data.external_keysign = 0;
1.178 markus 1261: if (options.rhosts_rsa_authentication ||
1262: options.hostbased_authentication) {
1.397 djm 1263: sensitive_data.nkeys = 9;
1.274 deraadt 1264: sensitive_data.keys = xcalloc(sensitive_data.nkeys,
1.180 deraadt 1265: sizeof(Key));
1.177 markus 1266:
1267: PRIV_START;
1.432 djm 1268: #if WITH_SSH1
1.112 markus 1269: sensitive_data.keys[0] = key_load_private_type(KEY_RSA1,
1.276 dtucker 1270: _PATH_HOST_KEY_FILE, "", NULL, NULL);
1.432 djm 1271: #endif
1.411 djm 1272: sensitive_data.keys[1] = key_load_private_cert(KEY_ECDSA,
1.349 djm 1273: _PATH_HOST_ECDSA_KEY_FILE, "", NULL);
1.411 djm 1274: sensitive_data.keys[2] = key_load_private_cert(KEY_ED25519,
1275: _PATH_HOST_ED25519_KEY_FILE, "", NULL);
1.349 djm 1276: sensitive_data.keys[3] = key_load_private_cert(KEY_RSA,
1.345 djm 1277: _PATH_HOST_RSA_KEY_FILE, "", NULL);
1.411 djm 1278: sensitive_data.keys[4] = key_load_private_cert(KEY_DSA,
1279: _PATH_HOST_DSA_KEY_FILE, "", NULL);
1280: sensitive_data.keys[5] = key_load_private_type(KEY_ECDSA,
1.349 djm 1281: _PATH_HOST_ECDSA_KEY_FILE, "", NULL, NULL);
1.411 djm 1282: sensitive_data.keys[6] = key_load_private_type(KEY_ED25519,
1283: _PATH_HOST_ED25519_KEY_FILE, "", NULL, NULL);
1.397 djm 1284: sensitive_data.keys[7] = key_load_private_type(KEY_RSA,
1.276 dtucker 1285: _PATH_HOST_RSA_KEY_FILE, "", NULL, NULL);
1.411 djm 1286: sensitive_data.keys[8] = key_load_private_type(KEY_DSA,
1287: _PATH_HOST_DSA_KEY_FILE, "", NULL, NULL);
1.177 markus 1288: PRIV_END;
1.173 markus 1289:
1.181 markus 1290: if (options.hostbased_authentication == 1 &&
1291: sensitive_data.keys[0] == NULL &&
1.349 djm 1292: sensitive_data.keys[5] == NULL &&
1.396 markus 1293: sensitive_data.keys[6] == NULL &&
1.397 djm 1294: sensitive_data.keys[7] == NULL &&
1295: sensitive_data.keys[8] == NULL) {
1.345 djm 1296: sensitive_data.keys[1] = key_load_cert(
1.411 djm 1297: _PATH_HOST_ECDSA_KEY_FILE);
1.345 djm 1298: sensitive_data.keys[2] = key_load_cert(
1.411 djm 1299: _PATH_HOST_ED25519_KEY_FILE);
1.349 djm 1300: sensitive_data.keys[3] = key_load_cert(
1.345 djm 1301: _PATH_HOST_RSA_KEY_FILE);
1.397 djm 1302: sensitive_data.keys[4] = key_load_cert(
1.411 djm 1303: _PATH_HOST_DSA_KEY_FILE);
1.397 djm 1304: sensitive_data.keys[5] = key_load_public(
1.411 djm 1305: _PATH_HOST_ECDSA_KEY_FILE, NULL);
1.397 djm 1306: sensitive_data.keys[6] = key_load_public(
1.411 djm 1307: _PATH_HOST_ED25519_KEY_FILE, NULL);
1.397 djm 1308: sensitive_data.keys[7] = key_load_public(
1.173 markus 1309: _PATH_HOST_RSA_KEY_FILE, NULL);
1.397 djm 1310: sensitive_data.keys[8] = key_load_public(
1.411 djm 1311: _PATH_HOST_DSA_KEY_FILE, NULL);
1.173 markus 1312: sensitive_data.external_keysign = 1;
1313: }
1.31 markus 1314: }
1.33 markus 1315: /*
1316: * Get rid of any extra privileges that we may have. We will no
1317: * longer need them. Also, extra privileges could make it very hard
1318: * to read identity files and other non-world-readable files from the
1319: * user's home directory if it happens to be on a NFS volume where
1320: * root is mapped to nobody.
1321: */
1.225 dtucker 1322: if (original_effective_uid == 0) {
1323: PRIV_START;
1324: permanently_set_uid(pw);
1325: }
1.31 markus 1326:
1.33 markus 1327: /*
1328: * Now that we are back to our own permissions, create ~/.ssh
1.254 djm 1329: * directory if it doesn't already exist.
1.33 markus 1330: */
1.367 djm 1331: if (config == NULL) {
1332: r = snprintf(buf, sizeof buf, "%s%s%s", pw->pw_dir,
1333: strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR);
1334: if (r > 0 && (size_t)r < sizeof(buf) && stat(buf, &st) < 0)
1335: if (mkdir(buf, 0700) < 0)
1336: error("Could not create directory '%.200s'.",
1337: buf);
1338: }
1.31 markus 1339:
1.104 markus 1340: /* load options.identity_files */
1341: load_public_identity_files();
1.439 markus 1342:
1343: /* optionally set the SSH_AUTHSOCKET_ENV_NAME varibale */
1.440 markus 1344: if (options.identity_agent &&
1345: strcmp(options.identity_agent, SSH_AUTHSOCKET_ENV_NAME) != 0) {
1.439 markus 1346: if (strcmp(options.identity_agent, "none") == 0) {
1347: unsetenv(SSH_AUTHSOCKET_ENV_NAME);
1348: } else {
1349: p = tilde_expand_filename(options.identity_agent,
1350: original_real_uid);
1351: cp = percent_expand(p, "d", pw->pw_dir,
1352: "u", pw->pw_name, "l", thishost, "h", host,
1353: "r", options.user, (char *)NULL);
1354: setenv(SSH_AUTHSOCKET_ENV_NAME, cp, 1);
1355: free(cp);
1356: free(p);
1357: }
1358: }
1.104 markus 1359:
1360: /* Expand ~ in known host file names. */
1.361 djm 1361: tilde_expand_paths(options.system_hostfiles,
1362: options.num_system_hostfiles);
1363: tilde_expand_paths(options.user_hostfiles, options.num_user_hostfiles);
1.149 markus 1364:
1365: signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
1.352 djm 1366: signal(SIGCHLD, main_sigchld_handler);
1.31 markus 1367:
1.316 djm 1368: /* Log into the remote system. Never returns if the login fails. */
1.303 djm 1369: ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr,
1.355 djm 1370: options.port, pw, timeout_ms);
1.339 djm 1371:
1372: if (packet_connection_is_on_socket()) {
1373: verbose("Authenticated to %s ([%s]:%d).", host,
1.437 djm 1374: ssh_remote_ipaddr(ssh), ssh_remote_port(ssh));
1.339 djm 1375: } else {
1376: verbose("Authenticated to %s (via proxy).", host);
1377: }
1.31 markus 1378:
1.112 markus 1379: /* We no longer need the private host keys. Clear them now. */
1380: if (sensitive_data.nkeys != 0) {
1381: for (i = 0; i < sensitive_data.nkeys; i++) {
1382: if (sensitive_data.keys[i] != NULL) {
1383: /* Destroys contents safely */
1384: debug3("clear hostkey %d", i);
1385: key_free(sensitive_data.keys[i]);
1386: sensitive_data.keys[i] = NULL;
1387: }
1388: }
1.378 djm 1389: free(sensitive_data.keys);
1.134 markus 1390: }
1391: for (i = 0; i < options.num_identity_files; i++) {
1.378 djm 1392: free(options.identity_files[i]);
1393: options.identity_files[i] = NULL;
1.134 markus 1394: if (options.identity_keys[i]) {
1395: key_free(options.identity_keys[i]);
1396: options.identity_keys[i] = NULL;
1397: }
1.112 markus 1398: }
1.426 djm 1399: for (i = 0; i < options.num_certificate_files; i++) {
1400: free(options.certificate_files[i]);
1401: options.certificate_files[i] = NULL;
1402: }
1.31 markus 1403:
1.447 markus 1404: skip_connect:
1.45 markus 1405: exit_status = compat20 ? ssh_session2() : ssh_session();
1406: packet_close();
1.186 djm 1407:
1.312 djm 1408: if (options.control_path != NULL && muxserver_sock != -1)
1.214 djm 1409: unlink(options.control_path);
1410:
1.353 djm 1411: /* Kill ProxyCommand if it is running. */
1412: ssh_kill_proxy_command();
1.186 djm 1413:
1.45 markus 1414: return exit_status;
1415: }
1416:
1.344 djm 1417: static void
1418: control_persist_detach(void)
1419: {
1420: pid_t pid;
1.438 djm 1421: int devnull, keep_stderr;
1.344 djm 1422:
1423: debug("%s: backgrounding master process", __func__);
1424:
1425: /*
1426: * master (current process) into the background, and make the
1427: * foreground process a client of the backgrounded master.
1428: */
1429: switch ((pid = fork())) {
1430: case -1:
1431: fatal("%s: fork: %s", __func__, strerror(errno));
1432: case 0:
1433: /* Child: master process continues mainloop */
1434: break;
1435: default:
1436: /* Parent: set up mux slave to connect to backgrounded master */
1437: debug2("%s: background process is %ld", __func__, (long)pid);
1438: stdin_null_flag = ostdin_null_flag;
1.359 djm 1439: options.request_tty = orequest_tty;
1.344 djm 1440: tty_flag = otty_flag;
1441: close(muxserver_sock);
1442: muxserver_sock = -1;
1.351 markus 1443: options.control_master = SSHCTL_MASTER_NO;
1.344 djm 1444: muxclient(options.control_path);
1445: /* muxclient() doesn't return on success. */
1446: fatal("Failed to connect to new control master");
1447: }
1.346 djm 1448: if ((devnull = open(_PATH_DEVNULL, O_RDWR)) == -1) {
1449: error("%s: open(\"/dev/null\"): %s", __func__,
1450: strerror(errno));
1451: } else {
1.438 djm 1452: keep_stderr = log_is_on_stderr() && debug_flag;
1.346 djm 1453: if (dup2(devnull, STDIN_FILENO) == -1 ||
1.438 djm 1454: dup2(devnull, STDOUT_FILENO) == -1 ||
1455: (!keep_stderr && dup2(devnull, STDERR_FILENO) == -1))
1.346 djm 1456: error("%s: dup2: %s", __func__, strerror(errno));
1457: if (devnull > STDERR_FILENO)
1458: close(devnull);
1459: }
1.381 djm 1460: daemon(1, 1);
1.362 djm 1461: setproctitle("%s [mux]", options.control_path);
1.344 djm 1462: }
1463:
1464: /* Do fork() after authentication. Used by "ssh -f" */
1465: static void
1466: fork_postauth(void)
1467: {
1468: if (need_controlpersist_detach)
1469: control_persist_detach();
1470: debug("forking to background");
1471: fork_after_authentication_flag = 0;
1472: if (daemon(1, 1) < 0)
1473: fatal("daemon() failed: %.200s", strerror(errno));
1474: }
1475:
1.315 djm 1476: /* Callback for remote forward global requests */
1477: static void
1478: ssh_confirm_remote_forward(int type, u_int32_t seq, void *ctxt)
1479: {
1.406 millert 1480: struct Forward *rfwd = (struct Forward *)ctxt;
1.315 djm 1481:
1.324 djm 1482: /* XXX verbose() on failure? */
1.404 markus 1483: debug("remote forward %s for: listen %s%s%d, connect %s:%d",
1.315 djm 1484: type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
1.406 millert 1485: rfwd->listen_path ? rfwd->listen_path :
1486: rfwd->listen_host ? rfwd->listen_host : "",
1487: (rfwd->listen_path || rfwd->listen_host) ? ":" : "",
1488: rfwd->listen_port, rfwd->connect_path ? rfwd->connect_path :
1489: rfwd->connect_host, rfwd->connect_port);
1490: if (rfwd->listen_path == NULL && rfwd->listen_port == 0) {
1.366 markus 1491: if (type == SSH2_MSG_REQUEST_SUCCESS) {
1492: rfwd->allocated_port = packet_get_int();
1493: logit("Allocated port %u for remote forward to %s:%d",
1494: rfwd->allocated_port,
1495: rfwd->connect_host, rfwd->connect_port);
1496: channel_update_permitted_opens(rfwd->handle,
1497: rfwd->allocated_port);
1498: } else {
1499: channel_update_permitted_opens(rfwd->handle, -1);
1500: }
1.324 djm 1501: }
1502:
1.315 djm 1503: if (type == SSH2_MSG_REQUEST_FAILURE) {
1.406 millert 1504: if (options.exit_on_forward_failure) {
1505: if (rfwd->listen_path != NULL)
1506: fatal("Error: remote port forwarding failed "
1507: "for listen path %s", rfwd->listen_path);
1508: else
1509: fatal("Error: remote port forwarding failed "
1510: "for listen port %d", rfwd->listen_port);
1511: } else {
1512: if (rfwd->listen_path != NULL)
1513: logit("Warning: remote port forwarding failed "
1514: "for listen path %s", rfwd->listen_path);
1515: else
1516: logit("Warning: remote port forwarding failed "
1517: "for listen port %d", rfwd->listen_port);
1518: }
1.315 djm 1519: }
1.318 djm 1520: if (++remote_forward_confirms_received == options.num_remote_forwards) {
1.315 djm 1521: debug("All remote forwarding requests processed");
1.344 djm 1522: if (fork_after_authentication_flag)
1523: fork_postauth();
1.318 djm 1524: }
1.315 djm 1525: }
1526:
1.126 itojun 1527: static void
1.331 dtucker 1528: client_cleanup_stdio_fwd(int id, void *arg)
1529: {
1530: debug("stdio forwarding: done");
1531: cleanup_exit(0);
1532: }
1533:
1.368 djm 1534: static void
1.407 djm 1535: ssh_stdio_confirm(int id, int success, void *arg)
1536: {
1537: if (!success)
1538: fatal("stdio forwarding failed");
1539: }
1540:
1541: static void
1.368 djm 1542: ssh_init_stdio_forwarding(void)
1.331 dtucker 1543: {
1544: Channel *c;
1.332 djm 1545: int in, out;
1.331 dtucker 1546:
1.441 dtucker 1547: if (options.stdio_forward_host == NULL)
1.368 djm 1548: return;
1.384 djm 1549: if (!compat20)
1.368 djm 1550: fatal("stdio forwarding require Protocol 2");
1551:
1.441 dtucker 1552: debug3("%s: %s:%d", __func__, options.stdio_forward_host,
1553: options.stdio_forward_port);
1.332 djm 1554:
1.368 djm 1555: if ((in = dup(STDIN_FILENO)) < 0 ||
1556: (out = dup(STDOUT_FILENO)) < 0)
1.332 djm 1557: fatal("channel_connect_stdio_fwd: dup() in/out failed");
1.441 dtucker 1558: if ((c = channel_connect_stdio_fwd(options.stdio_forward_host,
1559: options.stdio_forward_port, in, out)) == NULL)
1.368 djm 1560: fatal("%s: channel_connect_stdio_fwd failed", __func__);
1.331 dtucker 1561: channel_register_cleanup(c->self, client_cleanup_stdio_fwd, 0);
1.407 djm 1562: channel_register_open_confirm(c->self, ssh_stdio_confirm, NULL);
1.331 dtucker 1563: }
1564:
1565: static void
1.70 markus 1566: ssh_init_forwarding(void)
1567: {
1.86 markus 1568: int success = 0;
1.70 markus 1569: int i;
1.331 dtucker 1570:
1.70 markus 1571: /* Initiate local TCP/IP port forwardings. */
1572: for (i = 0; i < options.num_local_forwards; i++) {
1.232 djm 1573: debug("Local connections to %.200s:%d forwarded to remote "
1574: "address %.200s:%d",
1.406 millert 1575: (options.local_forwards[i].listen_path != NULL) ?
1576: options.local_forwards[i].listen_path :
1.234 deraadt 1577: (options.local_forwards[i].listen_host == NULL) ?
1.406 millert 1578: (options.fwd_opts.gateway_ports ? "*" : "LOCALHOST") :
1.232 djm 1579: options.local_forwards[i].listen_host,
1580: options.local_forwards[i].listen_port,
1.406 millert 1581: (options.local_forwards[i].connect_path != NULL) ?
1582: options.local_forwards[i].connect_path :
1.232 djm 1583: options.local_forwards[i].connect_host,
1584: options.local_forwards[i].connect_port);
1.158 markus 1585: success += channel_setup_local_fwd_listener(
1.406 millert 1586: &options.local_forwards[i], &options.fwd_opts);
1.70 markus 1587: }
1.283 markus 1588: if (i > 0 && success != i && options.exit_on_forward_failure)
1589: fatal("Could not request local forwarding.");
1.86 markus 1590: if (i > 0 && success == 0)
1591: error("Could not request local forwarding.");
1.70 markus 1592:
1593: /* Initiate remote TCP/IP port forwardings. */
1594: for (i = 0; i < options.num_remote_forwards; i++) {
1.232 djm 1595: debug("Remote connections from %.200s:%d forwarded to "
1596: "local address %.200s:%d",
1.406 millert 1597: (options.remote_forwards[i].listen_path != NULL) ?
1598: options.remote_forwards[i].listen_path :
1.248 djm 1599: (options.remote_forwards[i].listen_host == NULL) ?
1.253 djm 1600: "LOCALHOST" : options.remote_forwards[i].listen_host,
1.232 djm 1601: options.remote_forwards[i].listen_port,
1.406 millert 1602: (options.remote_forwards[i].connect_path != NULL) ?
1603: options.remote_forwards[i].connect_path :
1.232 djm 1604: options.remote_forwards[i].connect_host,
1605: options.remote_forwards[i].connect_port);
1.366 markus 1606: options.remote_forwards[i].handle =
1607: channel_request_remote_forwarding(
1.406 millert 1608: &options.remote_forwards[i]);
1.366 markus 1609: if (options.remote_forwards[i].handle < 0) {
1.283 markus 1610: if (options.exit_on_forward_failure)
1611: fatal("Could not request remote forwarding.");
1612: else
1613: logit("Warning: Could not request remote "
1614: "forwarding.");
1.366 markus 1615: } else {
1616: client_register_global_confirm(ssh_confirm_remote_forward,
1617: &options.remote_forwards[i]);
1.283 markus 1618: }
1.70 markus 1619: }
1.301 djm 1620:
1621: /* Initiate tunnel forwarding. */
1622: if (options.tun_open != SSH_TUNMODE_NO) {
1623: if (client_request_tun_fwd(options.tun_open,
1624: options.tun_local, options.tun_remote) == -1) {
1625: if (options.exit_on_forward_failure)
1626: fatal("Could not request tunnel forwarding.");
1627: else
1628: error("Could not request tunnel forwarding.");
1629: }
1630: }
1.70 markus 1631: }
1632:
1.126 itojun 1633: static void
1.70 markus 1634: check_agent_present(void)
1635: {
1.412 djm 1636: int r;
1637:
1.70 markus 1638: if (options.forward_agent) {
1.254 djm 1639: /* Clear agent forwarding if we don't have an agent. */
1.412 djm 1640: if ((r = ssh_get_authentication_socket(NULL)) != 0) {
1.70 markus 1641: options.forward_agent = 0;
1.412 djm 1642: if (r != SSH_ERR_AGENT_NOT_PRESENT)
1643: debug("ssh_get_authentication_socket: %s",
1644: ssh_err(r));
1645: }
1.70 markus 1646: }
1647: }
1648:
1.126 itojun 1649: static int
1.45 markus 1650: ssh_session(void)
1651: {
1652: int type;
1653: int interactive = 0;
1654: int have_tty = 0;
1655: struct winsize ws;
1656: char *cp;
1.243 djm 1657: const char *display;
1.433 djm 1658: char *proto = NULL, *data = NULL;
1.45 markus 1659:
1.31 markus 1660: /* Enable compression if requested. */
1661: if (options.compression) {
1.316 djm 1662: debug("Requesting compression at level %d.",
1663: options.compression_level);
1.31 markus 1664:
1.316 djm 1665: if (options.compression_level < 1 ||
1666: options.compression_level > 9)
1667: fatal("Compression level must be from 1 (fast) to "
1668: "9 (slow, best).");
1.31 markus 1669:
1670: /* Send the request. */
1671: packet_start(SSH_CMSG_REQUEST_COMPRESSION);
1672: packet_put_int(options.compression_level);
1673: packet_send();
1674: packet_write_wait();
1.156 markus 1675: type = packet_read();
1.31 markus 1676: if (type == SSH_SMSG_SUCCESS)
1677: packet_start_compression(options.compression_level);
1678: else if (type == SSH_SMSG_FAILURE)
1.191 itojun 1679: logit("Warning: Remote host refused compression.");
1.31 markus 1680: else
1.316 djm 1681: packet_disconnect("Protocol error waiting for "
1682: "compression response.");
1.31 markus 1683: }
1684: /* Allocate a pseudo tty if appropriate. */
1685: if (tty_flag) {
1686: debug("Requesting pty.");
1687:
1688: /* Start the packet. */
1689: packet_start(SSH_CMSG_REQUEST_PTY);
1690:
1691: /* Store TERM in the packet. There is no limit on the
1692: length of the string. */
1693: cp = getenv("TERM");
1694: if (!cp)
1695: cp = "";
1.124 markus 1696: packet_put_cstring(cp);
1.31 markus 1697:
1698: /* Store window size in the packet. */
1699: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
1700: memset(&ws, 0, sizeof(ws));
1.269 deraadt 1701: packet_put_int((u_int)ws.ws_row);
1702: packet_put_int((u_int)ws.ws_col);
1703: packet_put_int((u_int)ws.ws_xpixel);
1704: packet_put_int((u_int)ws.ws_ypixel);
1.31 markus 1705:
1706: /* Store tty modes in the packet. */
1.115 stevesk 1707: tty_make_modes(fileno(stdin), NULL);
1.31 markus 1708:
1709: /* Send the packet, and wait for it to leave. */
1710: packet_send();
1711: packet_write_wait();
1712:
1713: /* Read response from the server. */
1.156 markus 1714: type = packet_read();
1.43 markus 1715: if (type == SSH_SMSG_SUCCESS) {
1.31 markus 1716: interactive = 1;
1.45 markus 1717: have_tty = 1;
1.43 markus 1718: } else if (type == SSH_SMSG_FAILURE)
1.316 djm 1719: logit("Warning: Remote host failed or refused to "
1720: "allocate a pseudo tty.");
1.31 markus 1721: else
1.316 djm 1722: packet_disconnect("Protocol error waiting for pty "
1723: "request response.");
1.31 markus 1724: }
1725: /* Request X11 forwarding if enabled and DISPLAY is set. */
1.243 djm 1726: display = getenv("DISPLAY");
1.417 djm 1727: if (display == NULL && options.forward_x11)
1728: debug("X11 forwarding requested but DISPLAY not set");
1.433 djm 1729: if (options.forward_x11 && client_x11_get_proto(display,
1730: options.xauth_location, options.forward_x11_trusted,
1731: options.forward_x11_timeout, &proto, &data) == 0) {
1.50 markus 1732: /* Request forwarding with authentication spoofing. */
1.316 djm 1733: debug("Requesting X11 forwarding with authentication "
1734: "spoofing.");
1.363 djm 1735: x11_request_forwarding_with_spoofing(0, display, proto,
1736: data, 0);
1.31 markus 1737: /* Read response from the server. */
1.156 markus 1738: type = packet_read();
1.31 markus 1739: if (type == SSH_SMSG_SUCCESS) {
1740: interactive = 1;
1.50 markus 1741: } else if (type == SSH_SMSG_FAILURE) {
1.191 itojun 1742: logit("Warning: Remote host denied X11 forwarding.");
1.50 markus 1743: } else {
1.316 djm 1744: packet_disconnect("Protocol error waiting for X11 "
1745: "forwarding");
1.50 markus 1746: }
1.31 markus 1747: }
1748: /* Tell the packet module whether this is an interactive session. */
1.354 djm 1749: packet_set_interactive(interactive,
1750: options.ip_qos_interactive, options.ip_qos_bulk);
1.31 markus 1751:
1752: /* Request authentication agent forwarding if appropriate. */
1.70 markus 1753: check_agent_present();
1754:
1.31 markus 1755: if (options.forward_agent) {
1756: debug("Requesting authentication agent forwarding.");
1757: auth_request_forwarding();
1758:
1759: /* Read response from the server. */
1.156 markus 1760: type = packet_read();
1.155 markus 1761: packet_check_eom();
1.31 markus 1762: if (type != SSH_SMSG_SUCCESS)
1.191 itojun 1763: logit("Warning: Remote host denied authentication agent forwarding.");
1.31 markus 1764: }
1765:
1.70 markus 1766: /* Initiate port forwardings. */
1.368 djm 1767: ssh_init_stdio_forwarding();
1.70 markus 1768: ssh_init_forwarding();
1.305 dtucker 1769:
1770: /* Execute a local command */
1771: if (options.local_command != NULL &&
1772: options.permit_local_command)
1773: ssh_local_cmd(options.local_command);
1.34 markus 1774:
1.318 djm 1775: /*
1776: * If requested and we are not interested in replies to remote
1777: * forwarding requests, then let ssh continue in the background.
1778: */
1.344 djm 1779: if (fork_after_authentication_flag) {
1780: if (options.exit_on_forward_failure &&
1781: options.num_remote_forwards > 0) {
1782: debug("deferring postauth fork until remote forward "
1783: "confirmation received");
1784: } else
1785: fork_postauth();
1.318 djm 1786: }
1.31 markus 1787:
1.33 markus 1788: /*
1789: * If a command was specified on the command line, execute the
1790: * command now. Otherwise request the server to start a shell.
1791: */
1.31 markus 1792: if (buffer_len(&command) > 0) {
1793: int len = buffer_len(&command);
1794: if (len > 900)
1795: len = 900;
1.316 djm 1796: debug("Sending command: %.*s", len,
1797: (u_char *)buffer_ptr(&command));
1.31 markus 1798: packet_start(SSH_CMSG_EXEC_CMD);
1799: packet_put_string(buffer_ptr(&command), buffer_len(&command));
1800: packet_send();
1801: packet_write_wait();
1802: } else {
1803: debug("Requesting shell.");
1804: packet_start(SSH_CMSG_EXEC_SHELL);
1805: packet_send();
1806: packet_write_wait();
1807: }
1808:
1809: /* Enter the interactive session. */
1.119 stevesk 1810: return client_loop(have_tty, tty_flag ?
1811: options.escape_char : SSH_ESCAPECHAR_NONE, 0);
1.89 markus 1812: }
1813:
1.214 djm 1814: /* request pty/x11/agent/tcpfwd/shell for channel */
1815: static void
1.337 djm 1816: ssh_session2_setup(int id, int success, void *arg)
1.214 djm 1817: {
1.215 djm 1818: extern char **environ;
1.243 djm 1819: const char *display;
1820: int interactive = tty_flag;
1.433 djm 1821: char *proto = NULL, *data = NULL;
1.337 djm 1822:
1823: if (!success)
1824: return; /* No need for error message, channels code sens one */
1.215 djm 1825:
1.248 djm 1826: display = getenv("DISPLAY");
1.417 djm 1827: if (display == NULL && options.forward_x11)
1828: debug("X11 forwarding requested but DISPLAY not set");
1.433 djm 1829: if (options.forward_x11 && client_x11_get_proto(display,
1830: options.xauth_location, options.forward_x11_trusted,
1831: options.forward_x11_timeout, &proto, &data) == 0) {
1.50 markus 1832: /* Request forwarding with authentication spoofing. */
1.316 djm 1833: debug("Requesting X11 forwarding with authentication "
1834: "spoofing.");
1.363 djm 1835: x11_request_forwarding_with_spoofing(id, display, proto,
1836: data, 1);
1837: client_expect_confirm(id, "X11 forwarding", CONFIRM_WARN);
1838: /* XXX exit_on_forward_failure */
1.80 markus 1839: interactive = 1;
1.50 markus 1840: }
1841:
1.70 markus 1842: check_agent_present();
1843: if (options.forward_agent) {
1844: debug("Requesting authentication agent forwarding.");
1845: channel_request_start(id, "auth-agent-req@openssh.com", 0);
1846: packet_send();
1.212 djm 1847: }
1.369 dtucker 1848:
1849: /* Tell the packet module whether this is an interactive session. */
1850: packet_set_interactive(interactive,
1851: options.ip_qos_interactive, options.ip_qos_bulk);
1.212 djm 1852:
1.214 djm 1853: client_session2_setup(id, tty_flag, subsystem_flag, getenv("TERM"),
1.311 djm 1854: NULL, fileno(stdin), &command, environ);
1.45 markus 1855: }
1856:
1.143 markus 1857: /* open new channel for a session */
1.126 itojun 1858: static int
1.143 markus 1859: ssh_session2_open(void)
1.45 markus 1860: {
1.118 markus 1861: Channel *c;
1862: int window, packetmax, in, out, err;
1.60 markus 1863:
1.62 markus 1864: if (stdin_null_flag) {
1.93 itojun 1865: in = open(_PATH_DEVNULL, O_RDONLY);
1.62 markus 1866: } else {
1867: in = dup(STDIN_FILENO);
1868: }
1.60 markus 1869: out = dup(STDOUT_FILENO);
1870: err = dup(STDERR_FILENO);
1.45 markus 1871:
1872: if (in < 0 || out < 0 || err < 0)
1.62 markus 1873: fatal("dup() in/out/err failed");
1.45 markus 1874:
1.69 markus 1875: /* enable nonblocking unless tty */
1876: if (!isatty(in))
1877: set_nonblock(in);
1878: if (!isatty(out))
1879: set_nonblock(out);
1880: if (!isatty(err))
1881: set_nonblock(err);
1882:
1.65 markus 1883: window = CHAN_SES_WINDOW_DEFAULT;
1884: packetmax = CHAN_SES_PACKET_DEFAULT;
1.164 markus 1885: if (tty_flag) {
1886: window >>= 1;
1887: packetmax >>= 1;
1.45 markus 1888: }
1.118 markus 1889: c = channel_new(
1.45 markus 1890: "session", SSH_CHANNEL_OPENING, in, out, err,
1.65 markus 1891: window, packetmax, CHAN_EXTENDED_WRITE,
1.192 markus 1892: "client-session", /*nonblock*/0);
1.45 markus 1893:
1.143 markus 1894: debug3("ssh_session2_open: channel_new: %d", c->self);
1.106 markus 1895:
1.122 markus 1896: channel_send_open(c->self);
1.143 markus 1897: if (!no_shell_flag)
1.310 djm 1898: channel_register_open_confirm(c->self,
1899: ssh_session2_setup, NULL);
1.106 markus 1900:
1.118 markus 1901: return c->self;
1.106 markus 1902: }
1903:
1.126 itojun 1904: static int
1.106 markus 1905: ssh_session2(void)
1906: {
1.143 markus 1907: int id = -1;
1.106 markus 1908:
1909: /* XXX should be pre-session */
1.368 djm 1910: if (!options.control_persist)
1911: ssh_init_stdio_forwarding();
1.106 markus 1912: ssh_init_forwarding();
1913:
1.344 djm 1914: /* Start listening for multiplex clients */
1.447 markus 1915: if (!packet_get_mux())
1916: muxserver_listen();
1.344 djm 1917:
1918: /*
1.368 djm 1919: * If we are in control persist mode and have a working mux listen
1920: * socket, then prepare to background ourselves and have a foreground
1921: * client attach as a control slave.
1922: * NB. we must save copies of the flags that we override for
1.344 djm 1923: * the backgrounding, since we defer attachment of the slave until
1924: * after the connection is fully established (in particular,
1925: * async rfwd replies have been received for ExitOnForwardFailure).
1926: */
1927: if (options.control_persist && muxserver_sock != -1) {
1928: ostdin_null_flag = stdin_null_flag;
1929: ono_shell_flag = no_shell_flag;
1.359 djm 1930: orequest_tty = options.request_tty;
1.344 djm 1931: otty_flag = tty_flag;
1932: stdin_null_flag = 1;
1933: no_shell_flag = 1;
1934: tty_flag = 0;
1935: if (!fork_after_authentication_flag)
1936: need_controlpersist_detach = 1;
1937: fork_after_authentication_flag = 1;
1938: }
1.368 djm 1939: /*
1940: * ControlPersist mux listen socket setup failed, attempt the
1941: * stdio forward setup that we skipped earlier.
1942: */
1943: if (options.control_persist && muxserver_sock == -1)
1944: ssh_init_stdio_forwarding();
1.344 djm 1945:
1.143 markus 1946: if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN))
1947: id = ssh_session2_open();
1.379 djm 1948: else {
1949: packet_set_interactive(
1950: options.control_master == SSHCTL_MASTER_NO,
1951: options.ip_qos_interactive, options.ip_qos_bulk);
1952: }
1.314 djm 1953:
1954: /* If we don't expect to open a new session, then disallow it */
1.319 markus 1955: if (options.control_master == SSHCTL_MASTER_NO &&
1956: (datafellows & SSH_NEW_OPENSSH)) {
1.314 djm 1957: debug("Requesting no-more-sessions@openssh.com");
1958: packet_start(SSH2_MSG_GLOBAL_REQUEST);
1959: packet_put_cstring("no-more-sessions@openssh.com");
1960: packet_put_char(0);
1961: packet_send();
1962: }
1.255 reyk 1963:
1964: /* Execute a local command */
1965: if (options.local_command != NULL &&
1966: options.permit_local_command)
1967: ssh_local_cmd(options.local_command);
1.301 djm 1968:
1.342 djm 1969: /*
1970: * If requested and we are not interested in replies to remote
1971: * forwarding requests, then let ssh continue in the background.
1972: */
1.344 djm 1973: if (fork_after_authentication_flag) {
1974: if (options.exit_on_forward_failure &&
1975: options.num_remote_forwards > 0) {
1976: debug("deferring postauth fork until remote forward "
1977: "confirmation received");
1978: } else
1979: fork_postauth();
1.318 djm 1980: }
1.31 markus 1981:
1.119 stevesk 1982: return client_loop(tty_flag, tty_flag ?
1983: options.escape_char : SSH_ESCAPECHAR_NONE, id);
1.72 markus 1984: }
1985:
1.426 djm 1986: /* Loads all IdentityFile and CertificateFile keys */
1.126 itojun 1987: static void
1.104 markus 1988: load_public_identity_files(void)
1989: {
1.275 djm 1990: char *filename, *cp, thishost[NI_MAXHOST];
1.306 deraadt 1991: char *pwdir = NULL, *pwname = NULL;
1.104 markus 1992: Key *public;
1.275 djm 1993: struct passwd *pw;
1.426 djm 1994: int i;
1995: u_int n_ids, n_certs;
1.335 djm 1996: char *identity_files[SSH_MAX_IDENTITY_FILES];
1997: Key *identity_keys[SSH_MAX_IDENTITY_FILES];
1.426 djm 1998: char *certificate_files[SSH_MAX_CERTIFICATE_FILES];
1999: struct sshkey *certificates[SSH_MAX_CERTIFICATE_FILES];
1.333 markus 2000: #ifdef ENABLE_PKCS11
1.167 markus 2001: Key **keys;
1.333 markus 2002: int nkeys;
1.335 djm 2003: #endif /* PKCS11 */
1.104 markus 2004:
1.426 djm 2005: n_ids = n_certs = 0;
1.398 tedu 2006: memset(identity_files, 0, sizeof(identity_files));
2007: memset(identity_keys, 0, sizeof(identity_keys));
1.426 djm 2008: memset(certificate_files, 0, sizeof(certificate_files));
2009: memset(certificates, 0, sizeof(certificates));
1.335 djm 2010:
2011: #ifdef ENABLE_PKCS11
1.333 markus 2012: if (options.pkcs11_provider != NULL &&
1.167 markus 2013: options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
1.333 markus 2014: (pkcs11_init(!options.batch_mode) == 0) &&
2015: (nkeys = pkcs11_add_provider(options.pkcs11_provider, NULL,
2016: &keys)) > 0) {
2017: for (i = 0; i < nkeys; i++) {
1.335 djm 2018: if (n_ids >= SSH_MAX_IDENTITY_FILES) {
2019: key_free(keys[i]);
2020: continue;
2021: }
2022: identity_keys[n_ids] = keys[i];
2023: identity_files[n_ids] =
1.333 markus 2024: xstrdup(options.pkcs11_provider); /* XXX */
1.335 djm 2025: n_ids++;
1.167 markus 2026: }
1.378 djm 2027: free(keys);
1.127 markus 2028: }
1.333 markus 2029: #endif /* ENABLE_PKCS11 */
1.275 djm 2030: if ((pw = getpwuid(original_real_uid)) == NULL)
2031: fatal("load_public_identity_files: getpwuid failed");
1.307 dtucker 2032: pwname = xstrdup(pw->pw_name);
2033: pwdir = xstrdup(pw->pw_dir);
1.275 djm 2034: if (gethostname(thishost, sizeof(thishost)) == -1)
2035: fatal("load_public_identity_files: gethostname: %s",
2036: strerror(errno));
1.335 djm 2037: for (i = 0; i < options.num_identity_files; i++) {
1.373 djm 2038: if (n_ids >= SSH_MAX_IDENTITY_FILES ||
2039: strcasecmp(options.identity_files[i], "none") == 0) {
1.378 djm 2040: free(options.identity_files[i]);
1.426 djm 2041: options.identity_files[i] = NULL;
1.335 djm 2042: continue;
2043: }
1.275 djm 2044: cp = tilde_expand_filename(options.identity_files[i],
1.131 millert 2045: original_real_uid);
1.306 deraadt 2046: filename = percent_expand(cp, "d", pwdir,
2047: "u", pwname, "l", thishost, "h", host,
1.275 djm 2048: "r", options.user, (char *)NULL);
1.378 djm 2049: free(cp);
1.131 millert 2050: public = key_load_public(filename, NULL);
2051: debug("identity file %s type %d", filename,
2052: public ? public->type : -1);
1.378 djm 2053: free(options.identity_files[i]);
1.335 djm 2054: identity_files[n_ids] = filename;
2055: identity_keys[n_ids] = public;
2056:
2057: if (++n_ids >= SSH_MAX_IDENTITY_FILES)
2058: continue;
2059:
1.426 djm 2060: /*
2061: * If no certificates have been explicitly listed then try
2062: * to add the default certificate variant too.
2063: */
2064: if (options.num_certificate_files != 0)
2065: continue;
1.335 djm 2066: xasprintf(&cp, "%s-cert", filename);
2067: public = key_load_public(cp, NULL);
2068: debug("identity file %s type %d", cp,
2069: public ? public->type : -1);
2070: if (public == NULL) {
1.378 djm 2071: free(cp);
1.335 djm 2072: continue;
2073: }
2074: if (!key_is_cert(public)) {
2075: debug("%s: key %s type %s is not a certificate",
2076: __func__, cp, key_type(public));
2077: key_free(public);
1.378 djm 2078: free(cp);
1.335 djm 2079: continue;
2080: }
1.448 djm 2081: /* NB. leave filename pointing to private key */
2082: identity_files[n_ids] = xstrdup(filename);
1.335 djm 2083: identity_keys[n_ids] = public;
2084: n_ids++;
2085: }
1.426 djm 2086:
2087: if (options.num_certificate_files > SSH_MAX_CERTIFICATE_FILES)
2088: fatal("%s: too many certificates", __func__);
2089: for (i = 0; i < options.num_certificate_files; i++) {
2090: cp = tilde_expand_filename(options.certificate_files[i],
2091: original_real_uid);
2092: filename = percent_expand(cp, "d", pwdir,
2093: "u", pwname, "l", thishost, "h", host,
2094: "r", options.user, (char *)NULL);
2095: free(cp);
2096:
2097: public = key_load_public(filename, NULL);
2098: debug("certificate file %s type %d", filename,
2099: public ? public->type : -1);
2100: free(options.certificate_files[i]);
2101: options.certificate_files[i] = NULL;
2102: if (public == NULL) {
2103: free(filename);
2104: continue;
2105: }
2106: if (!key_is_cert(public)) {
2107: debug("%s: key %s type %s is not a certificate",
2108: __func__, filename, key_type(public));
2109: key_free(public);
2110: free(filename);
2111: continue;
2112: }
2113: certificate_files[n_certs] = filename;
2114: certificates[n_certs] = public;
2115: ++n_certs;
2116: }
2117:
1.335 djm 2118: options.num_identity_files = n_ids;
2119: memcpy(options.identity_files, identity_files, sizeof(identity_files));
2120: memcpy(options.identity_keys, identity_keys, sizeof(identity_keys));
1.426 djm 2121:
2122: options.num_certificate_files = n_certs;
2123: memcpy(options.certificate_files,
2124: certificate_files, sizeof(certificate_files));
2125: memcpy(options.certificates, certificates, sizeof(certificates));
1.335 djm 2126:
1.398 tedu 2127: explicit_bzero(pwname, strlen(pwname));
1.378 djm 2128: free(pwname);
1.398 tedu 2129: explicit_bzero(pwdir, strlen(pwdir));
1.378 djm 2130: free(pwdir);
1.214 djm 2131: }
1.352 djm 2132:
2133: static void
2134: main_sigchld_handler(int sig)
2135: {
2136: int save_errno = errno;
2137: pid_t pid;
2138: int status;
2139:
2140: while ((pid = waitpid(-1, &status, WNOHANG)) > 0 ||
2141: (pid < 0 && errno == EINTR))
2142: ;
2143:
2144: signal(sig, main_sigchld_handler);
2145: errno = save_errno;
2146: }