Annotation of src/usr.bin/ssh/ssh.c, Revision 1.437
1.437 ! djm 1: /* $OpenBSD: ssh.c,v 1.436 2016/02/15 09:47:49 dtucker 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"
1.278 stevesk 98: #include "version.h"
1.412 djm 99: #include "ssherr.h"
1.420 djm 100: #include "myproposal.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"
1.425 jmc 190: " [-F configfile] [-I pkcs11] [-i identity_file] [-L address]\n"
191: " [-l login_name] [-m mac_spec] [-O ctl_cmd] [-o option] [-p port]\n"
192: " [-Q query_option] [-R address] [-S ctl_path] [-W host:port]\n"
1.395 jmc 193: " [-w local_tun[:remote_tun]] [user@]hostname [command]\n"
1.208 markus 194: );
1.257 dtucker 195: exit(255);
1.1 deraadt 196: }
197:
1.126 itojun 198: static int ssh_session(void);
199: static int ssh_session2(void);
200: static void load_public_identity_files(void);
1.352 djm 201: static void main_sigchld_handler(int);
1.312 djm 202:
203: /* from muxclient.c */
204: void muxclient(const char *);
205: void muxserver_listen(void);
1.45 markus 206:
1.361 djm 207: /* ~/ expand a list of paths. NB. assumes path[n] is heap-allocated. */
208: static void
209: tilde_expand_paths(char **paths, u_int num_paths)
210: {
211: u_int i;
212: char *cp;
213:
214: for (i = 0; i < num_paths; i++) {
215: cp = tilde_expand_filename(paths[i], original_real_uid);
1.378 djm 216: free(paths[i]);
1.361 djm 217: paths[i] = cp;
218: }
219: }
220:
1.400 djm 221: /*
222: * Attempt to resolve a host name / port to a set of addresses and
223: * optionally return any CNAMEs encountered along the way.
224: * Returns NULL on failure.
225: * NB. this function must operate with a options having undefined members.
226: */
1.385 djm 227: static struct addrinfo *
1.400 djm 228: resolve_host(const char *name, int port, int logerr, char *cname, size_t clen)
1.385 djm 229: {
230: char strport[NI_MAXSERV];
231: struct addrinfo hints, *res;
232: int gaierr, loglevel = SYSLOG_LEVEL_DEBUG1;
233:
1.400 djm 234: if (port <= 0)
235: port = default_ssh_port();
236:
1.427 djm 237: snprintf(strport, sizeof strport, "%d", port);
1.398 tedu 238: memset(&hints, 0, sizeof(hints));
1.400 djm 239: hints.ai_family = options.address_family == -1 ?
240: AF_UNSPEC : options.address_family;
1.385 djm 241: hints.ai_socktype = SOCK_STREAM;
242: if (cname != NULL)
243: hints.ai_flags = AI_CANONNAME;
244: if ((gaierr = getaddrinfo(name, strport, &hints, &res)) != 0) {
245: if (logerr || (gaierr != EAI_NONAME && gaierr != EAI_NODATA))
246: loglevel = SYSLOG_LEVEL_ERROR;
247: do_log2(loglevel, "%s: Could not resolve hostname %.100s: %s",
248: __progname, name, ssh_gai_strerror(gaierr));
249: return NULL;
250: }
251: if (cname != NULL && res->ai_canonname != NULL) {
252: if (strlcpy(cname, res->ai_canonname, clen) >= clen) {
253: error("%s: host \"%s\" cname \"%s\" too long (max %lu)",
254: __func__, name, res->ai_canonname, (u_long)clen);
255: if (clen > 0)
256: *cname = '\0';
257: }
258: }
259: return res;
260: }
261:
262: /*
1.413 djm 263: * Attempt to resolve a numeric host address / port to a single address.
264: * Returns a canonical address string.
265: * Returns NULL on failure.
266: * NB. this function must operate with a options having undefined members.
267: */
268: static struct addrinfo *
269: resolve_addr(const char *name, int port, char *caddr, size_t clen)
270: {
271: char addr[NI_MAXHOST], strport[NI_MAXSERV];
272: struct addrinfo hints, *res;
273: int gaierr;
274:
275: if (port <= 0)
276: port = default_ssh_port();
277: snprintf(strport, sizeof strport, "%u", port);
278: memset(&hints, 0, sizeof(hints));
279: hints.ai_family = options.address_family == -1 ?
280: AF_UNSPEC : options.address_family;
281: hints.ai_socktype = SOCK_STREAM;
282: hints.ai_flags = AI_NUMERICHOST|AI_NUMERICSERV;
283: if ((gaierr = getaddrinfo(name, strport, &hints, &res)) != 0) {
284: debug2("%s: could not resolve name %.100s as address: %s",
285: __func__, name, ssh_gai_strerror(gaierr));
286: return NULL;
287: }
288: if (res == NULL) {
289: debug("%s: getaddrinfo %.100s returned no addresses",
290: __func__, name);
291: return NULL;
292: }
293: if (res->ai_next != NULL) {
294: debug("%s: getaddrinfo %.100s returned multiple addresses",
295: __func__, name);
296: goto fail;
297: }
298: if ((gaierr = getnameinfo(res->ai_addr, res->ai_addrlen,
299: addr, sizeof(addr), NULL, 0, NI_NUMERICHOST)) != 0) {
300: debug("%s: Could not format address for name %.100s: %s",
301: __func__, name, ssh_gai_strerror(gaierr));
302: goto fail;
303: }
304: if (strlcpy(caddr, addr, clen) >= clen) {
305: error("%s: host \"%s\" addr \"%s\" too long (max %lu)",
306: __func__, name, addr, (u_long)clen);
307: if (clen > 0)
308: *caddr = '\0';
309: fail:
310: freeaddrinfo(res);
311: return NULL;
312: }
313: return res;
314: }
315:
316: /*
1.385 djm 317: * Check whether the cname is a permitted replacement for the hostname
318: * and perform the replacement if it is.
1.400 djm 319: * NB. this function must operate with a options having undefined members.
1.385 djm 320: */
321: static int
322: check_follow_cname(char **namep, const char *cname)
323: {
324: int i;
325: struct allowed_cname *rule;
326:
327: if (*cname == '\0' || options.num_permitted_cnames == 0 ||
328: strcmp(*namep, cname) == 0)
329: return 0;
1.386 djm 330: if (options.canonicalize_hostname == SSH_CANONICALISE_NO)
1.385 djm 331: return 0;
332: /*
1.386 djm 333: * Don't attempt to canonicalize names that will be interpreted by
1.385 djm 334: * a proxy unless the user specifically requests so.
335: */
1.400 djm 336: if (!option_clear_or_none(options.proxy_command) &&
1.386 djm 337: options.canonicalize_hostname != SSH_CANONICALISE_ALWAYS)
1.385 djm 338: return 0;
339: debug3("%s: check \"%s\" CNAME \"%s\"", __func__, *namep, cname);
340: for (i = 0; i < options.num_permitted_cnames; i++) {
341: rule = options.permitted_cnames + i;
1.418 djm 342: if (match_pattern_list(*namep, rule->source_list, 1) != 1 ||
343: match_pattern_list(cname, rule->target_list, 1) != 1)
1.385 djm 344: continue;
1.386 djm 345: verbose("Canonicalized DNS aliased hostname "
1.385 djm 346: "\"%s\" => \"%s\"", *namep, cname);
347: free(*namep);
348: *namep = xstrdup(cname);
349: return 1;
350: }
351: return 0;
352: }
353:
354: /*
355: * Attempt to resolve the supplied hostname after applying the user's
1.387 djm 356: * canonicalization rules. Returns the address list for the host or NULL
357: * if no name was found after canonicalization.
1.400 djm 358: * NB. this function must operate with a options having undefined members.
1.385 djm 359: */
360: static struct addrinfo *
1.400 djm 361: resolve_canonicalize(char **hostp, int port)
1.385 djm 362: {
363: int i, ndots;
1.413 djm 364: char *cp, *fullhost, newname[NI_MAXHOST];
1.385 djm 365: struct addrinfo *addrs;
366:
1.386 djm 367: if (options.canonicalize_hostname == SSH_CANONICALISE_NO)
1.385 djm 368: return NULL;
1.400 djm 369:
1.385 djm 370: /*
1.386 djm 371: * Don't attempt to canonicalize names that will be interpreted by
1.385 djm 372: * a proxy unless the user specifically requests so.
373: */
1.400 djm 374: if (!option_clear_or_none(options.proxy_command) &&
1.386 djm 375: options.canonicalize_hostname != SSH_CANONICALISE_ALWAYS)
1.385 djm 376: return NULL;
1.400 djm 377:
1.413 djm 378: /* Try numeric hostnames first */
379: if ((addrs = resolve_addr(*hostp, port,
380: newname, sizeof(newname))) != NULL) {
381: debug2("%s: hostname %.100s is address", __func__, *hostp);
382: if (strcasecmp(*hostp, newname) != 0) {
383: debug2("%s: canonicalised address \"%s\" => \"%s\"",
384: __func__, *hostp, newname);
385: free(*hostp);
386: *hostp = xstrdup(newname);
387: }
388: return addrs;
389: }
390:
1.428 djm 391: /* If domain name is anchored, then resolve it now */
392: if ((*hostp)[strlen(*hostp) - 1] == '.') {
393: debug3("%s: name is fully qualified", __func__);
394: fullhost = xstrdup(*hostp);
395: if ((addrs = resolve_host(fullhost, port, 0,
396: newname, sizeof(newname))) != NULL)
397: goto found;
398: free(fullhost);
399: goto notfound;
400: }
401:
1.387 djm 402: /* Don't apply canonicalization to sufficiently-qualified hostnames */
1.385 djm 403: ndots = 0;
404: for (cp = *hostp; *cp != '\0'; cp++) {
405: if (*cp == '.')
406: ndots++;
407: }
1.386 djm 408: if (ndots > options.canonicalize_max_dots) {
409: debug3("%s: not canonicalizing hostname \"%s\" (max dots %d)",
410: __func__, *hostp, options.canonicalize_max_dots);
1.385 djm 411: return NULL;
412: }
413: /* Attempt each supplied suffix */
414: for (i = 0; i < options.num_canonical_domains; i++) {
1.413 djm 415: *newname = '\0';
1.385 djm 416: xasprintf(&fullhost, "%s.%s.", *hostp,
417: options.canonical_domains[i]);
1.400 djm 418: debug3("%s: attempting \"%s\" => \"%s\"", __func__,
419: *hostp, fullhost);
420: if ((addrs = resolve_host(fullhost, port, 0,
1.413 djm 421: newname, sizeof(newname))) == NULL) {
1.385 djm 422: free(fullhost);
423: continue;
424: }
1.428 djm 425: found:
1.385 djm 426: /* Remove trailing '.' */
427: fullhost[strlen(fullhost) - 1] = '\0';
428: /* Follow CNAME if requested */
1.413 djm 429: if (!check_follow_cname(&fullhost, newname)) {
1.386 djm 430: debug("Canonicalized hostname \"%s\" => \"%s\"",
1.385 djm 431: *hostp, fullhost);
432: }
433: free(*hostp);
434: *hostp = fullhost;
435: return addrs;
436: }
1.428 djm 437: notfound:
1.386 djm 438: if (!options.canonicalize_fallback_local)
1.400 djm 439: fatal("%s: Could not resolve host \"%s\"", __progname, *hostp);
440: debug2("%s: host %s not found in any suffix", __func__, *hostp);
1.385 djm 441: return NULL;
442: }
443:
1.32 deraadt 444: /*
1.400 djm 445: * Read per-user configuration file. Ignore the system wide config
446: * file if the user specifies a config file on the command line.
447: */
448: static void
1.408 djm 449: process_config_files(const char *host_arg, struct passwd *pw, int post_canon)
1.400 djm 450: {
1.414 deraadt 451: char buf[PATH_MAX];
1.400 djm 452: int r;
453:
454: if (config != NULL) {
455: if (strcasecmp(config, "none") != 0 &&
1.408 djm 456: !read_config_file(config, pw, host, host_arg, &options,
457: SSHCONF_USERCONF | (post_canon ? SSHCONF_POSTCANON : 0)))
1.400 djm 458: fatal("Can't open user config file %.100s: "
459: "%.100s", config, strerror(errno));
460: } else {
461: r = snprintf(buf, sizeof buf, "%s/%s", pw->pw_dir,
462: _PATH_SSH_USER_CONFFILE);
463: if (r > 0 && (size_t)r < sizeof(buf))
1.408 djm 464: (void)read_config_file(buf, pw, host, host_arg,
465: &options, SSHCONF_CHECKPERM | SSHCONF_USERCONF |
466: (post_canon ? SSHCONF_POSTCANON : 0));
1.400 djm 467:
468: /* Read systemwide configuration file after user config. */
1.408 djm 469: (void)read_config_file(_PATH_HOST_CONFIG_FILE, pw,
470: host, host_arg, &options,
471: post_canon ? SSHCONF_POSTCANON : 0);
472: }
473: }
474:
475: /* Rewrite the port number in an addrinfo list of addresses */
476: static void
477: set_addrinfo_port(struct addrinfo *addrs, int port)
478: {
479: struct addrinfo *addr;
480:
481: for (addr = addrs; addr != NULL; addr = addr->ai_next) {
482: switch (addr->ai_family) {
483: case AF_INET:
484: ((struct sockaddr_in *)addr->ai_addr)->
485: sin_port = htons(port);
486: break;
487: case AF_INET6:
488: ((struct sockaddr_in6 *)addr->ai_addr)->
489: sin6_port = htons(port);
490: break;
491: }
1.400 djm 492: }
493: }
494:
495: /*
1.32 deraadt 496: * Main program for the ssh client.
497: */
1.2 provos 498: int
499: main(int ac, char **av)
1.1 deraadt 500: {
1.437 ! djm 501: struct ssh *ssh = NULL;
1.408 djm 502: int i, r, opt, exit_status, use_syslog, config_test = 0;
1.414 deraadt 503: char *p, *cp, *line, *argv0, buf[PATH_MAX], *host_arg, *logfile;
1.358 djm 504: char thishost[NI_MAXHOST], shorthost[NI_MAXHOST], portstr[NI_MAXSERV];
1.423 djm 505: char cname[NI_MAXHOST], uidstr[32], *conn_hash_hex;
1.31 markus 506: struct stat st;
1.98 markus 507: struct passwd *pw;
1.382 djm 508: int timeout_ms;
1.144 stevesk 509: extern int optind, optreset;
510: extern char *optarg;
1.406 millert 511: struct Forward fwd;
1.385 djm 512: struct addrinfo *addrs = NULL;
1.405 djm 513: struct ssh_digest_ctx *md;
514: u_char conn_hash[SSH_DIGEST_MAX_LENGTH];
1.250 djm 515:
1.436 dtucker 516: ssh_malloc_init(); /* must be called before any mallocs */
1.250 djm 517: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
518: sanitise_stdfd();
1.31 markus 519:
1.33 markus 520: /*
1.346 djm 521: * Discard other fds that are hanging around. These can cause problem
522: * with backgrounded ssh processes started by ControlPersist.
523: */
524: closefrom(STDERR_FILENO + 1);
525:
526: /*
1.33 markus 527: * Save the original real uid. It will be needed later (uid-swapping
528: * may clobber the real uid).
529: */
1.31 markus 530: original_real_uid = getuid();
531: original_effective_uid = geteuid();
532:
1.184 stevesk 533: /*
534: * Use uid-swapping to give up root privileges for the duration of
535: * option processing. We will re-instantiate the rights when we are
536: * ready to create the privileged port, and will permanently drop
537: * them when the port has been created (actually, when the connection
538: * has been made, as we may need to create the port several times).
539: */
540: PRIV_END;
541:
1.31 markus 542: /* If we are installed setuid root be careful to not drop core. */
543: if (original_real_uid != original_effective_uid) {
544: struct rlimit rlim;
545: rlim.rlim_cur = rlim.rlim_max = 0;
546: if (setrlimit(RLIMIT_CORE, &rlim) < 0)
547: fatal("setrlimit failed: %.100s", strerror(errno));
1.1 deraadt 548: }
1.107 markus 549: /* Get user data. */
550: pw = getpwuid(original_real_uid);
551: if (!pw) {
1.380 djm 552: logit("No user exists for uid %lu", (u_long)original_real_uid);
1.257 dtucker 553: exit(255);
1.107 markus 554: }
555: /* Take a copy of the returned structure. */
556: pw = pwcopy(pw);
1.31 markus 557:
1.33 markus 558: /*
559: * Set our umask to something reasonable, as some files are created
560: * with the default umask. This will make them world-readable but
561: * writable only by the owner, which is ok for all files for which we
562: * don't set the modes explicitly.
563: */
1.31 markus 564: umask(022);
565:
1.316 djm 566: /*
567: * Initialize option structure to indicate that no values have been
568: * set.
569: */
1.31 markus 570: initialize_options(&options);
571:
572: /* Parse command-line arguments. */
573: host = NULL;
1.320 djm 574: use_syslog = 0;
1.375 dtucker 575: logfile = NULL;
1.325 markus 576: argv0 = av[0];
1.31 markus 577:
1.266 djm 578: again:
1.316 djm 579: while ((opt = getopt(ac, av, "1246ab:c:e:fgi:kl:m:no:p:qstvx"
1.408 djm 580: "ACD:E:F:GI:KL:MNO:PQ:R:S:TVw:W:XYy")) != -1) {
1.31 markus 581: switch (opt) {
1.91 jakob 582: case '1':
583: options.protocol = SSH_PROTO_1;
584: break;
1.47 markus 585: case '2':
586: options.protocol = SSH_PROTO_2;
587: break;
1.37 markus 588: case '4':
1.196 djm 589: options.address_family = AF_INET;
1.37 markus 590: break;
591: case '6':
1.196 djm 592: options.address_family = AF_INET6;
1.37 markus 593: break;
1.31 markus 594: case 'n':
595: stdin_null_flag = 1;
596: break;
597: case 'f':
598: fork_after_authentication_flag = 1;
599: stdin_null_flag = 1;
600: break;
601: case 'x':
602: options.forward_x11 = 0;
603: break;
604: case 'X':
605: options.forward_x11 = 1;
606: break;
1.320 djm 607: case 'y':
608: use_syslog = 1;
609: break;
1.375 dtucker 610: case 'E':
1.422 dtucker 611: logfile = optarg;
1.375 dtucker 612: break;
1.408 djm 613: case 'G':
614: config_test = 1;
615: break;
1.202 markus 616: case 'Y':
617: options.forward_x11 = 1;
618: options.forward_x11_trusted = 1;
619: break;
1.31 markus 620: case 'g':
1.406 millert 621: options.fwd_opts.gateway_ports = 1;
1.31 markus 622: break;
1.229 djm 623: case 'O':
1.332 djm 624: if (stdio_forward_host != NULL)
625: fatal("Cannot specify multiplexing "
626: "command with -W");
627: else if (muxclient_command != 0)
628: fatal("Multiplexing command already specified");
1.229 djm 629: if (strcmp(optarg, "check") == 0)
1.312 djm 630: muxclient_command = SSHMUX_COMMAND_ALIVE_CHECK;
1.338 markus 631: else if (strcmp(optarg, "forward") == 0)
632: muxclient_command = SSHMUX_COMMAND_FORWARD;
1.229 djm 633: else if (strcmp(optarg, "exit") == 0)
1.312 djm 634: muxclient_command = SSHMUX_COMMAND_TERMINATE;
1.357 djm 635: else if (strcmp(optarg, "stop") == 0)
636: muxclient_command = SSHMUX_COMMAND_STOP;
1.365 djm 637: else if (strcmp(optarg, "cancel") == 0)
638: muxclient_command = SSHMUX_COMMAND_CANCEL_FWD;
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)
1.396 markus 656: cp = key_alg_list(0, 0);
657: else if (strcmp(optarg, "key-cert") == 0)
658: cp = key_alg_list(1, 0);
659: else if (strcmp(optarg, "key-plain") == 0)
660: cp = key_alg_list(0, 1);
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;
1.31 markus 705: case 't':
1.359 djm 706: if (options.request_tty == REQUEST_TTY_YES)
707: options.request_tty = REQUEST_TTY_FORCE;
708: else
709: options.request_tty = REQUEST_TTY_YES;
1.31 markus 710: break;
711: case 'v':
1.197 markus 712: if (debug_flag == 0) {
1.66 markus 713: debug_flag = 1;
714: options.log_level = SYSLOG_LEVEL_DEBUG1;
1.197 markus 715: } else {
716: if (options.log_level < SYSLOG_LEVEL_DEBUG3)
717: options.log_level++;
718: }
1.375 dtucker 719: break;
1.31 markus 720: case 'V':
1.209 markus 721: fprintf(stderr, "%s, %s\n",
1.402 markus 722: SSH_VERSION,
723: #ifdef WITH_OPENSSL
724: SSLeay_version(SSLEAY_VERSION)
725: #else
726: "without OpenSSL"
727: #endif
728: );
1.31 markus 729: if (opt == 'V')
730: exit(0);
731: break;
1.255 reyk 732: case 'w':
1.256 reyk 733: if (options.tun_open == -1)
734: options.tun_open = SSH_TUNMODE_DEFAULT;
1.255 reyk 735: options.tun_local = a2tun(optarg, &options.tun_remote);
1.256 reyk 736: if (options.tun_local == SSH_TUNID_ERR) {
1.316 djm 737: fprintf(stderr,
738: "Bad tun device '%s'\n", optarg);
1.257 dtucker 739: exit(255);
1.255 reyk 740: }
741: break;
1.331 dtucker 742: case 'W':
1.332 djm 743: if (stdio_forward_host != NULL)
744: fatal("stdio forward already specified");
745: if (muxclient_command != 0)
746: fatal("Cannot specify stdio forward with -O");
1.331 dtucker 747: if (parse_forward(&fwd, optarg, 1, 0)) {
748: stdio_forward_host = fwd.listen_host;
749: stdio_forward_port = fwd.listen_port;
1.378 djm 750: free(fwd.connect_host);
1.331 dtucker 751: } else {
752: fprintf(stderr,
753: "Bad stdio forwarding specification '%s'\n",
754: optarg);
755: exit(255);
756: }
1.359 djm 757: options.request_tty = REQUEST_TTY_NO;
1.331 dtucker 758: no_shell_flag = 1;
759: options.clear_forwardings = 1;
760: options.exit_on_forward_failure = 1;
761: break;
1.31 markus 762: case 'q':
763: options.log_level = SYSLOG_LEVEL_QUIET;
764: break;
765: case 'e':
766: if (optarg[0] == '^' && optarg[2] == 0 &&
1.128 fgsch 767: (u_char) optarg[1] >= 64 &&
768: (u_char) optarg[1] < 128)
1.78 markus 769: options.escape_char = (u_char) optarg[1] & 31;
1.31 markus 770: else if (strlen(optarg) == 1)
1.78 markus 771: options.escape_char = (u_char) optarg[0];
1.31 markus 772: else if (strcmp(optarg, "none") == 0)
1.119 stevesk 773: options.escape_char = SSH_ESCAPECHAR_NONE;
1.31 markus 774: else {
1.128 fgsch 775: fprintf(stderr, "Bad escape character '%s'.\n",
776: optarg);
1.257 dtucker 777: exit(255);
1.31 markus 778: }
779: break;
780: case 'c':
1.420 djm 781: if (ciphers_valid(*optarg == '+' ?
782: optarg + 1 : optarg)) {
1.49 markus 783: /* SSH2 only */
1.422 dtucker 784: free(options.ciphers);
1.49 markus 785: options.ciphers = xstrdup(optarg);
1.224 markus 786: options.cipher = SSH_CIPHER_INVALID;
1.420 djm 787: break;
788: }
789: /* SSH1 only */
790: options.cipher = cipher_number(optarg);
791: if (options.cipher == -1) {
792: fprintf(stderr, "Unknown cipher type '%s'\n",
793: optarg);
794: exit(255);
1.95 markus 795: }
1.420 djm 796: if (options.cipher == SSH_CIPHER_3DES)
797: options.ciphers = xstrdup("3des-cbc");
798: else if (options.cipher == SSH_CIPHER_BLOWFISH)
799: options.ciphers = xstrdup("blowfish-cbc");
800: else
801: options.ciphers = xstrdup(KEX_CLIENT_ENCRYPT);
1.95 markus 802: break;
803: case 'm':
1.422 dtucker 804: if (mac_valid(optarg)) {
805: free(options.macs);
1.95 markus 806: options.macs = xstrdup(optarg);
1.422 dtucker 807: } else {
1.128 fgsch 808: fprintf(stderr, "Unknown mac type '%s'\n",
809: optarg);
1.257 dtucker 810: exit(255);
1.31 markus 811: }
812: break;
1.214 djm 813: case 'M':
1.242 djm 814: if (options.control_master == SSHCTL_MASTER_YES)
815: options.control_master = SSHCTL_MASTER_ASK;
816: else
817: options.control_master = SSHCTL_MASTER_YES;
1.214 djm 818: break;
1.31 markus 819: case 'p':
1.113 stevesk 820: options.port = a2port(optarg);
1.323 djm 821: if (options.port <= 0) {
1.109 markus 822: fprintf(stderr, "Bad port '%s'\n", optarg);
1.257 dtucker 823: exit(255);
1.109 markus 824: }
1.31 markus 825: break;
826: case 'l':
827: options.user = optarg;
828: break;
1.141 stevesk 829:
830: case 'L':
1.324 djm 831: if (parse_forward(&fwd, optarg, 0, 0))
1.232 djm 832: add_local_forward(&options, &fwd);
833: else {
1.128 fgsch 834: fprintf(stderr,
1.232 djm 835: "Bad local forwarding specification '%s'\n",
1.128 fgsch 836: optarg);
1.257 dtucker 837: exit(255);
1.31 markus 838: }
1.232 djm 839: break;
840:
841: case 'R':
1.324 djm 842: if (parse_forward(&fwd, optarg, 0, 1)) {
1.232 djm 843: add_remote_forward(&options, &fwd);
844: } else {
1.128 fgsch 845: fprintf(stderr,
1.232 djm 846: "Bad remote forwarding specification "
847: "'%s'\n", optarg);
1.257 dtucker 848: exit(255);
1.31 markus 849: }
850: break;
1.108 markus 851:
852: case 'D':
1.324 djm 853: if (parse_forward(&fwd, optarg, 1, 0)) {
1.322 stevesk 854: add_local_forward(&options, &fwd);
1.232 djm 855: } else {
1.322 stevesk 856: fprintf(stderr,
857: "Bad dynamic forwarding specification "
858: "'%s'\n", optarg);
1.257 dtucker 859: exit(255);
1.109 markus 860: }
1.108 markus 861: break;
862:
1.31 markus 863: case 'C':
864: options.compression = 1;
865: break;
1.45 markus 866: case 'N':
867: no_shell_flag = 1;
1.359 djm 868: options.request_tty = REQUEST_TTY_NO;
1.45 markus 869: break;
870: case 'T':
1.359 djm 871: options.request_tty = REQUEST_TTY_NO;
1.45 markus 872: break;
1.31 markus 873: case 'o':
1.205 markus 874: line = xstrdup(optarg);
1.408 djm 875: if (process_config_line(&options, pw,
876: host ? host : "", host ? host : "", line,
877: "command-line", 0, NULL, SSHCONF_USERCONF) != 0)
1.257 dtucker 878: exit(255);
1.378 djm 879: free(line);
1.31 markus 880: break;
1.85 djm 881: case 's':
882: subsystem_flag = 1;
1.117 markus 883: break;
1.214 djm 884: case 'S':
1.431 mmcc 885: free(options.control_path);
1.214 djm 886: options.control_path = xstrdup(optarg);
887: break;
1.117 markus 888: case 'b':
889: options.bind_address = optarg;
1.85 djm 890: break;
1.139 markus 891: case 'F':
892: config = optarg;
893: break;
1.31 markus 894: default:
895: usage();
1.1 deraadt 896: }
1.31 markus 897: }
898:
1.128 fgsch 899: ac -= optind;
900: av += optind;
901:
1.329 guenther 902: if (ac > 0 && !host) {
1.188 markus 903: if (strrchr(*av, '@')) {
1.128 fgsch 904: p = xstrdup(*av);
1.188 markus 905: cp = strrchr(p, '@');
1.128 fgsch 906: if (cp == NULL || cp == p)
907: usage();
908: options.user = p;
909: *cp = '\0';
1.385 djm 910: host = xstrdup(++cp);
1.128 fgsch 911: } else
1.385 djm 912: host = xstrdup(*av);
1.189 millert 913: if (ac > 1) {
914: optind = optreset = 1;
1.128 fgsch 915: goto again;
916: }
1.189 millert 917: ac--, av++;
1.128 fgsch 918: }
919:
1.31 markus 920: /* Check that we got a host name. */
921: if (!host)
922: usage();
923:
1.385 djm 924: host_arg = xstrdup(host);
925:
1.402 markus 926: #ifdef WITH_OPENSSL
1.350 djm 927: OpenSSL_add_all_algorithms();
1.72 markus 928: ERR_load_crypto_strings();
1.402 markus 929: #endif
1.31 markus 930:
931: /* Initialize the command to execute on remote host. */
932: buffer_init(&command);
1.1 deraadt 933:
1.33 markus 934: /*
935: * Save the command to execute on the remote host in a buffer. There
936: * is no limit on the length of the command, except by the maximum
937: * packet size. Also sets the tty flag if there is no command.
938: */
1.128 fgsch 939: if (!ac) {
1.31 markus 940: /* No command specified - execute shell on a tty. */
1.85 djm 941: if (subsystem_flag) {
1.128 fgsch 942: fprintf(stderr,
943: "You must specify a subsystem to invoke.\n");
1.85 djm 944: usage();
945: }
1.31 markus 946: } else {
1.128 fgsch 947: /* A command has been specified. Store it into the buffer. */
948: for (i = 0; i < ac; i++) {
949: if (i)
1.31 markus 950: buffer_append(&command, " ", 1);
951: buffer_append(&command, av[i], strlen(av[i]));
952: }
953: }
954:
955: /* Cannot fork to background if no command. */
1.316 djm 956: if (fork_after_authentication_flag && buffer_len(&command) == 0 &&
957: !no_shell_flag)
958: fatal("Cannot fork into background without a command "
959: "to execute.");
1.31 markus 960:
1.101 markus 961: /*
962: * Initialize "log" output. Since we are the client all output
1.375 dtucker 963: * goes to stderr unless otherwise specified by -y or -E.
1.101 markus 964: */
1.375 dtucker 965: if (use_syslog && logfile != NULL)
966: fatal("Can't specify both -y and -E");
1.422 dtucker 967: if (logfile != NULL)
1.375 dtucker 968: log_redirect_stderr_to(logfile);
1.325 markus 969: log_init(argv0,
1.316 djm 970: options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level,
1.320 djm 971: SYSLOG_FACILITY_USER, !use_syslog);
1.375 dtucker 972:
973: if (debug_flag)
1.402 markus 974: logit("%s, %s", SSH_VERSION,
975: #ifdef WITH_OPENSSL
976: SSLeay_version(SSLEAY_VERSION)
977: #else
978: "without OpenSSL"
979: #endif
980: );
1.31 markus 981:
1.400 djm 982: /* Parse the configuration files */
1.408 djm 983: process_config_files(host_arg, pw, 0);
1.400 djm 984:
985: /* Hostname canonicalisation needs a few options filled. */
986: fill_default_options_for_canonicalization(&options);
987:
988: /* If the user has replaced the hostname then take it into use now */
989: if (options.hostname != NULL) {
990: /* NB. Please keep in sync with readconf.c:match_cfg_line() */
991: cp = percent_expand(options.hostname,
992: "h", host, (char *)NULL);
993: free(host);
994: host = cp;
1.408 djm 995: free(options.hostname);
996: options.hostname = xstrdup(host);
1.400 djm 997: }
998:
999: /* If canonicalization requested then try to apply it */
1000: lowercase(host);
1001: if (options.canonicalize_hostname != SSH_CANONICALISE_NO)
1002: addrs = resolve_canonicalize(&host, options.port);
1003:
1.139 markus 1004: /*
1.401 djm 1005: * If CanonicalizePermittedCNAMEs have been specified but
1006: * other canonicalization did not happen (by not being requested
1007: * or by failing with fallback) then the hostname may still be changed
1008: * as a result of CNAME following.
1009: *
1010: * Try to resolve the bare hostname name using the system resolver's
1011: * usual search rules and then apply the CNAME follow rules.
1012: *
1013: * Skip the lookup if a ProxyCommand is being used unless the user
1014: * has specifically requested canonicalisation for this case via
1015: * CanonicalizeHostname=always
1.139 markus 1016: */
1.401 djm 1017: if (addrs == NULL && options.num_permitted_cnames != 0 &&
1018: (option_clear_or_none(options.proxy_command) ||
1.400 djm 1019: options.canonicalize_hostname == SSH_CANONICALISE_ALWAYS)) {
1.403 djm 1020: if ((addrs = resolve_host(host, options.port,
1021: option_clear_or_none(options.proxy_command),
1022: cname, sizeof(cname))) == NULL) {
1023: /* Don't fatal proxied host names not in the DNS */
1024: if (option_clear_or_none(options.proxy_command))
1025: cleanup_exit(255); /* logged in resolve_host */
1026: } else
1027: check_follow_cname(&host, cname);
1.400 djm 1028: }
1.139 markus 1029:
1.400 djm 1030: /*
1.408 djm 1031: * If canonicalisation is enabled then re-parse the configuration
1032: * files as new stanzas may match.
1.400 djm 1033: */
1.408 djm 1034: if (options.canonicalize_hostname != 0) {
1035: debug("Re-reading configuration after hostname "
1036: "canonicalisation");
1037: free(options.hostname);
1038: options.hostname = xstrdup(host);
1039: process_config_files(host_arg, pw, 1);
1040: /*
1041: * Address resolution happens early with canonicalisation
1042: * enabled and the port number may have changed since, so
1043: * reset it in address list
1044: */
1045: if (addrs != NULL && options.port > 0)
1046: set_addrinfo_port(addrs, options.port);
1.139 markus 1047: }
1.31 markus 1048:
1049: /* Fill configuration defaults. */
1050: fill_default_options(&options);
1051:
1.400 djm 1052: if (options.port == 0)
1053: options.port = default_ssh_port();
1.196 djm 1054: channel_set_af(options.address_family);
1055:
1.383 djm 1056: /* Tidy and check options */
1057: if (options.host_key_alias != NULL)
1058: lowercase(options.host_key_alias);
1059: if (options.proxy_command != NULL &&
1060: strcmp(options.proxy_command, "-") == 0 &&
1061: options.proxy_use_fdpass)
1062: fatal("ProxyCommand=- and ProxyUseFDPass are incompatible");
1.415 djm 1063: if (options.control_persist &&
1064: options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK) {
1065: debug("UpdateHostKeys=ask is incompatible with ControlPersist; "
1066: "disabling");
1067: options.update_hostkeys = 0;
1068: }
1.430 djm 1069: if (options.connection_attempts <= 0)
1070: fatal("Invalid number of ConnectionAttempts");
1071:
1.388 djm 1072: if (original_effective_uid != 0)
1073: options.use_privileged_port = 0;
1.383 djm 1074:
1.31 markus 1075: /* reinit */
1.325 markus 1076: log_init(argv0, options.log_level, SYSLOG_FACILITY_USER, !use_syslog);
1.370 djm 1077:
1078: if (options.request_tty == REQUEST_TTY_YES ||
1079: options.request_tty == REQUEST_TTY_FORCE)
1080: tty_flag = 1;
1081:
1082: /* Allocate a tty by default if no command specified. */
1083: if (buffer_len(&command) == 0)
1084: tty_flag = options.request_tty != REQUEST_TTY_NO;
1085:
1086: /* Force no tty */
1087: if (options.request_tty == REQUEST_TTY_NO || muxclient_command != 0)
1088: tty_flag = 0;
1089: /* Do not allocate a tty if stdin is not a tty. */
1090: if ((!isatty(fileno(stdin)) || stdin_null_flag) &&
1091: options.request_tty != REQUEST_TTY_FORCE) {
1092: if (tty_flag)
1093: logit("Pseudo-terminal will not be allocated because "
1094: "stdin is not a terminal.");
1095: tty_flag = 0;
1096: }
1.31 markus 1097:
1098: if (options.user == NULL)
1099: options.user = xstrdup(pw->pw_name);
1.343 djm 1100:
1.358 djm 1101: if (gethostname(thishost, sizeof(thishost)) == -1)
1102: fatal("gethostname: %s", strerror(errno));
1103: strlcpy(shorthost, thishost, sizeof(shorthost));
1104: shorthost[strcspn(thishost, ".")] = '\0';
1105: snprintf(portstr, sizeof(portstr), "%d", options.port);
1.423 djm 1106: snprintf(uidstr, sizeof(uidstr), "%d", pw->pw_uid);
1.358 djm 1107:
1.405 djm 1108: if ((md = ssh_digest_start(SSH_DIGEST_SHA1)) == NULL ||
1109: ssh_digest_update(md, thishost, strlen(thishost)) < 0 ||
1110: ssh_digest_update(md, host, strlen(host)) < 0 ||
1111: ssh_digest_update(md, portstr, strlen(portstr)) < 0 ||
1112: ssh_digest_update(md, options.user, strlen(options.user)) < 0 ||
1113: ssh_digest_final(md, conn_hash, sizeof(conn_hash)) < 0)
1114: fatal("%s: mux digest failed", __func__);
1115: ssh_digest_free(md);
1116: conn_hash_hex = tohex(conn_hash, ssh_digest_bytes(SSH_DIGEST_SHA1));
1117:
1.317 dtucker 1118: if (options.local_command != NULL) {
1119: debug3("expanding LocalCommand: %s", options.local_command);
1120: cp = options.local_command;
1.405 djm 1121: options.local_command = percent_expand(cp,
1122: "C", conn_hash_hex,
1123: "L", shorthost,
1124: "d", pw->pw_dir,
1125: "h", host,
1126: "l", thishost,
1127: "n", host_arg,
1128: "p", portstr,
1129: "r", options.user,
1130: "u", pw->pw_name,
1.358 djm 1131: (char *)NULL);
1.317 dtucker 1132: debug3("expanded LocalCommand: %s", options.local_command);
1.378 djm 1133: free(cp);
1.304 dtucker 1134: }
1.31 markus 1135:
1.214 djm 1136: if (options.control_path != NULL) {
1.241 djm 1137: cp = tilde_expand_filename(options.control_path,
1138: original_real_uid);
1.378 djm 1139: free(options.control_path);
1.405 djm 1140: options.control_path = percent_expand(cp,
1141: "C", conn_hash_hex,
1142: "L", shorthost,
1143: "h", host,
1144: "l", thishost,
1145: "n", host_arg,
1146: "p", portstr,
1147: "r", options.user,
1148: "u", pw->pw_name,
1.423 djm 1149: "i", uidstr,
1.358 djm 1150: (char *)NULL);
1.378 djm 1151: free(cp);
1.214 djm 1152: }
1.405 djm 1153: free(conn_hash_hex);
1.408 djm 1154:
1155: if (config_test) {
1156: dump_client_config(&options, host);
1157: exit(0);
1158: }
1.405 djm 1159:
1.312 djm 1160: if (muxclient_command != 0 && options.control_path == NULL)
1.240 djm 1161: fatal("No ControlPath specified for \"-O\" command");
1.242 djm 1162: if (options.control_path != NULL)
1.312 djm 1163: muxclient(options.control_path);
1.401 djm 1164:
1165: /*
1166: * If hostname canonicalisation was not enabled, then we may not
1167: * have yet resolved the hostname. Do so now.
1168: */
1169: if (addrs == NULL && options.proxy_command == NULL) {
1.421 djm 1170: debug2("resolving \"%s\" port %d", host, options.port);
1.401 djm 1171: if ((addrs = resolve_host(host, options.port, 1,
1172: cname, sizeof(cname))) == NULL)
1173: cleanup_exit(255); /* resolve_host logs the error */
1174: }
1.214 djm 1175:
1.303 djm 1176: timeout_ms = options.connection_timeout * 1000;
1177:
1.77 markus 1178: /* Open a connection to the remote host. */
1.385 djm 1179: if (ssh_connect(host, addrs, &hostaddr, options.port,
1180: options.address_family, options.connection_attempts,
1181: &timeout_ms, options.tcp_keep_alive,
1.388 djm 1182: options.use_privileged_port) != 0)
1.257 dtucker 1183: exit(255);
1.31 markus 1184:
1.391 djm 1185: if (addrs != NULL)
1186: freeaddrinfo(addrs);
1187:
1.385 djm 1188: packet_set_timeout(options.server_alive_interval,
1189: options.server_alive_count_max);
1190:
1.437 ! djm 1191: ssh = active_state; /* XXX */
! 1192:
1.303 djm 1193: if (timeout_ms > 0)
1194: debug3("timeout: %d ms remain after connect", timeout_ms);
1195:
1.33 markus 1196: /*
1197: * If we successfully made the connection, load the host private key
1198: * in case we will need it later for combined rsa-rhosts
1199: * authentication. This must be done before releasing extra
1200: * privileges, because the file is only readable by root.
1.174 markus 1201: * If we cannot access the private keys, load the public keys
1202: * instead and try to execute the ssh-keysign helper instead.
1.33 markus 1203: */
1.112 markus 1204: sensitive_data.nkeys = 0;
1205: sensitive_data.keys = NULL;
1.173 markus 1206: sensitive_data.external_keysign = 0;
1.178 markus 1207: if (options.rhosts_rsa_authentication ||
1208: options.hostbased_authentication) {
1.397 djm 1209: sensitive_data.nkeys = 9;
1.274 deraadt 1210: sensitive_data.keys = xcalloc(sensitive_data.nkeys,
1.180 deraadt 1211: sizeof(Key));
1.177 markus 1212:
1213: PRIV_START;
1.432 djm 1214: #if WITH_SSH1
1.112 markus 1215: sensitive_data.keys[0] = key_load_private_type(KEY_RSA1,
1.276 dtucker 1216: _PATH_HOST_KEY_FILE, "", NULL, NULL);
1.432 djm 1217: #endif
1.411 djm 1218: sensitive_data.keys[1] = key_load_private_cert(KEY_ECDSA,
1.349 djm 1219: _PATH_HOST_ECDSA_KEY_FILE, "", NULL);
1.411 djm 1220: sensitive_data.keys[2] = key_load_private_cert(KEY_ED25519,
1221: _PATH_HOST_ED25519_KEY_FILE, "", NULL);
1.349 djm 1222: sensitive_data.keys[3] = key_load_private_cert(KEY_RSA,
1.345 djm 1223: _PATH_HOST_RSA_KEY_FILE, "", NULL);
1.411 djm 1224: sensitive_data.keys[4] = key_load_private_cert(KEY_DSA,
1225: _PATH_HOST_DSA_KEY_FILE, "", NULL);
1226: sensitive_data.keys[5] = key_load_private_type(KEY_ECDSA,
1.349 djm 1227: _PATH_HOST_ECDSA_KEY_FILE, "", NULL, NULL);
1.411 djm 1228: sensitive_data.keys[6] = key_load_private_type(KEY_ED25519,
1229: _PATH_HOST_ED25519_KEY_FILE, "", NULL, NULL);
1.397 djm 1230: sensitive_data.keys[7] = key_load_private_type(KEY_RSA,
1.276 dtucker 1231: _PATH_HOST_RSA_KEY_FILE, "", NULL, NULL);
1.411 djm 1232: sensitive_data.keys[8] = key_load_private_type(KEY_DSA,
1233: _PATH_HOST_DSA_KEY_FILE, "", NULL, NULL);
1.177 markus 1234: PRIV_END;
1.173 markus 1235:
1.181 markus 1236: if (options.hostbased_authentication == 1 &&
1237: sensitive_data.keys[0] == NULL &&
1.349 djm 1238: sensitive_data.keys[5] == NULL &&
1.396 markus 1239: sensitive_data.keys[6] == NULL &&
1.397 djm 1240: sensitive_data.keys[7] == NULL &&
1241: sensitive_data.keys[8] == NULL) {
1.345 djm 1242: sensitive_data.keys[1] = key_load_cert(
1.411 djm 1243: _PATH_HOST_ECDSA_KEY_FILE);
1.345 djm 1244: sensitive_data.keys[2] = key_load_cert(
1.411 djm 1245: _PATH_HOST_ED25519_KEY_FILE);
1.349 djm 1246: sensitive_data.keys[3] = key_load_cert(
1.345 djm 1247: _PATH_HOST_RSA_KEY_FILE);
1.397 djm 1248: sensitive_data.keys[4] = key_load_cert(
1.411 djm 1249: _PATH_HOST_DSA_KEY_FILE);
1.397 djm 1250: sensitive_data.keys[5] = key_load_public(
1.411 djm 1251: _PATH_HOST_ECDSA_KEY_FILE, NULL);
1.397 djm 1252: sensitive_data.keys[6] = key_load_public(
1.411 djm 1253: _PATH_HOST_ED25519_KEY_FILE, NULL);
1.397 djm 1254: sensitive_data.keys[7] = key_load_public(
1.173 markus 1255: _PATH_HOST_RSA_KEY_FILE, NULL);
1.397 djm 1256: sensitive_data.keys[8] = key_load_public(
1.411 djm 1257: _PATH_HOST_DSA_KEY_FILE, NULL);
1.173 markus 1258: sensitive_data.external_keysign = 1;
1259: }
1.31 markus 1260: }
1.33 markus 1261: /*
1262: * Get rid of any extra privileges that we may have. We will no
1263: * longer need them. Also, extra privileges could make it very hard
1264: * to read identity files and other non-world-readable files from the
1265: * user's home directory if it happens to be on a NFS volume where
1266: * root is mapped to nobody.
1267: */
1.225 dtucker 1268: if (original_effective_uid == 0) {
1269: PRIV_START;
1270: permanently_set_uid(pw);
1271: }
1.31 markus 1272:
1.33 markus 1273: /*
1274: * Now that we are back to our own permissions, create ~/.ssh
1.254 djm 1275: * directory if it doesn't already exist.
1.33 markus 1276: */
1.367 djm 1277: if (config == NULL) {
1278: r = snprintf(buf, sizeof buf, "%s%s%s", pw->pw_dir,
1279: strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR);
1280: if (r > 0 && (size_t)r < sizeof(buf) && stat(buf, &st) < 0)
1281: if (mkdir(buf, 0700) < 0)
1282: error("Could not create directory '%.200s'.",
1283: buf);
1284: }
1.31 markus 1285:
1.104 markus 1286: /* load options.identity_files */
1287: load_public_identity_files();
1288:
1289: /* Expand ~ in known host file names. */
1.361 djm 1290: tilde_expand_paths(options.system_hostfiles,
1291: options.num_system_hostfiles);
1292: tilde_expand_paths(options.user_hostfiles, options.num_user_hostfiles);
1.149 markus 1293:
1294: signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
1.352 djm 1295: signal(SIGCHLD, main_sigchld_handler);
1.31 markus 1296:
1.316 djm 1297: /* Log into the remote system. Never returns if the login fails. */
1.303 djm 1298: ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr,
1.355 djm 1299: options.port, pw, timeout_ms);
1.339 djm 1300:
1301: if (packet_connection_is_on_socket()) {
1302: verbose("Authenticated to %s ([%s]:%d).", host,
1.437 ! djm 1303: ssh_remote_ipaddr(ssh), ssh_remote_port(ssh));
1.339 djm 1304: } else {
1305: verbose("Authenticated to %s (via proxy).", host);
1306: }
1.31 markus 1307:
1.112 markus 1308: /* We no longer need the private host keys. Clear them now. */
1309: if (sensitive_data.nkeys != 0) {
1310: for (i = 0; i < sensitive_data.nkeys; i++) {
1311: if (sensitive_data.keys[i] != NULL) {
1312: /* Destroys contents safely */
1313: debug3("clear hostkey %d", i);
1314: key_free(sensitive_data.keys[i]);
1315: sensitive_data.keys[i] = NULL;
1316: }
1317: }
1.378 djm 1318: free(sensitive_data.keys);
1.134 markus 1319: }
1320: for (i = 0; i < options.num_identity_files; i++) {
1.378 djm 1321: free(options.identity_files[i]);
1322: options.identity_files[i] = NULL;
1.134 markus 1323: if (options.identity_keys[i]) {
1324: key_free(options.identity_keys[i]);
1325: options.identity_keys[i] = NULL;
1326: }
1.112 markus 1327: }
1.426 djm 1328: for (i = 0; i < options.num_certificate_files; i++) {
1329: free(options.certificate_files[i]);
1330: options.certificate_files[i] = NULL;
1331: }
1.31 markus 1332:
1.45 markus 1333: exit_status = compat20 ? ssh_session2() : ssh_session();
1334: packet_close();
1.186 djm 1335:
1.312 djm 1336: if (options.control_path != NULL && muxserver_sock != -1)
1.214 djm 1337: unlink(options.control_path);
1338:
1.353 djm 1339: /* Kill ProxyCommand if it is running. */
1340: ssh_kill_proxy_command();
1.186 djm 1341:
1.45 markus 1342: return exit_status;
1343: }
1344:
1.344 djm 1345: static void
1346: control_persist_detach(void)
1347: {
1348: pid_t pid;
1.346 djm 1349: int devnull;
1.344 djm 1350:
1351: debug("%s: backgrounding master process", __func__);
1352:
1353: /*
1354: * master (current process) into the background, and make the
1355: * foreground process a client of the backgrounded master.
1356: */
1357: switch ((pid = fork())) {
1358: case -1:
1359: fatal("%s: fork: %s", __func__, strerror(errno));
1360: case 0:
1361: /* Child: master process continues mainloop */
1362: break;
1363: default:
1364: /* Parent: set up mux slave to connect to backgrounded master */
1365: debug2("%s: background process is %ld", __func__, (long)pid);
1366: stdin_null_flag = ostdin_null_flag;
1.359 djm 1367: options.request_tty = orequest_tty;
1.344 djm 1368: tty_flag = otty_flag;
1369: close(muxserver_sock);
1370: muxserver_sock = -1;
1.351 markus 1371: options.control_master = SSHCTL_MASTER_NO;
1.344 djm 1372: muxclient(options.control_path);
1373: /* muxclient() doesn't return on success. */
1374: fatal("Failed to connect to new control master");
1375: }
1.346 djm 1376: if ((devnull = open(_PATH_DEVNULL, O_RDWR)) == -1) {
1377: error("%s: open(\"/dev/null\"): %s", __func__,
1378: strerror(errno));
1379: } else {
1380: if (dup2(devnull, STDIN_FILENO) == -1 ||
1381: dup2(devnull, STDOUT_FILENO) == -1)
1382: error("%s: dup2: %s", __func__, strerror(errno));
1383: if (devnull > STDERR_FILENO)
1384: close(devnull);
1385: }
1.381 djm 1386: daemon(1, 1);
1.362 djm 1387: setproctitle("%s [mux]", options.control_path);
1.344 djm 1388: }
1389:
1390: /* Do fork() after authentication. Used by "ssh -f" */
1391: static void
1392: fork_postauth(void)
1393: {
1394: if (need_controlpersist_detach)
1395: control_persist_detach();
1396: debug("forking to background");
1397: fork_after_authentication_flag = 0;
1398: if (daemon(1, 1) < 0)
1399: fatal("daemon() failed: %.200s", strerror(errno));
1400: }
1401:
1.315 djm 1402: /* Callback for remote forward global requests */
1403: static void
1404: ssh_confirm_remote_forward(int type, u_int32_t seq, void *ctxt)
1405: {
1.406 millert 1406: struct Forward *rfwd = (struct Forward *)ctxt;
1.315 djm 1407:
1.324 djm 1408: /* XXX verbose() on failure? */
1.404 markus 1409: debug("remote forward %s for: listen %s%s%d, connect %s:%d",
1.315 djm 1410: type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
1.406 millert 1411: rfwd->listen_path ? rfwd->listen_path :
1412: rfwd->listen_host ? rfwd->listen_host : "",
1413: (rfwd->listen_path || rfwd->listen_host) ? ":" : "",
1414: rfwd->listen_port, rfwd->connect_path ? rfwd->connect_path :
1415: rfwd->connect_host, rfwd->connect_port);
1416: if (rfwd->listen_path == NULL && rfwd->listen_port == 0) {
1.366 markus 1417: if (type == SSH2_MSG_REQUEST_SUCCESS) {
1418: rfwd->allocated_port = packet_get_int();
1419: logit("Allocated port %u for remote forward to %s:%d",
1420: rfwd->allocated_port,
1421: rfwd->connect_host, rfwd->connect_port);
1422: channel_update_permitted_opens(rfwd->handle,
1423: rfwd->allocated_port);
1424: } else {
1425: channel_update_permitted_opens(rfwd->handle, -1);
1426: }
1.324 djm 1427: }
1428:
1.315 djm 1429: if (type == SSH2_MSG_REQUEST_FAILURE) {
1.406 millert 1430: if (options.exit_on_forward_failure) {
1431: if (rfwd->listen_path != NULL)
1432: fatal("Error: remote port forwarding failed "
1433: "for listen path %s", rfwd->listen_path);
1434: else
1435: fatal("Error: remote port forwarding failed "
1436: "for listen port %d", rfwd->listen_port);
1437: } else {
1438: if (rfwd->listen_path != NULL)
1439: logit("Warning: remote port forwarding failed "
1440: "for listen path %s", rfwd->listen_path);
1441: else
1442: logit("Warning: remote port forwarding failed "
1443: "for listen port %d", rfwd->listen_port);
1444: }
1.315 djm 1445: }
1.318 djm 1446: if (++remote_forward_confirms_received == options.num_remote_forwards) {
1.315 djm 1447: debug("All remote forwarding requests processed");
1.344 djm 1448: if (fork_after_authentication_flag)
1449: fork_postauth();
1.318 djm 1450: }
1.315 djm 1451: }
1452:
1.126 itojun 1453: static void
1.331 dtucker 1454: client_cleanup_stdio_fwd(int id, void *arg)
1455: {
1456: debug("stdio forwarding: done");
1457: cleanup_exit(0);
1458: }
1459:
1.368 djm 1460: static void
1.407 djm 1461: ssh_stdio_confirm(int id, int success, void *arg)
1462: {
1463: if (!success)
1464: fatal("stdio forwarding failed");
1465: }
1466:
1467: static void
1.368 djm 1468: ssh_init_stdio_forwarding(void)
1.331 dtucker 1469: {
1470: Channel *c;
1.332 djm 1471: int in, out;
1.331 dtucker 1472:
1.368 djm 1473: if (stdio_forward_host == NULL)
1474: return;
1.384 djm 1475: if (!compat20)
1.368 djm 1476: fatal("stdio forwarding require Protocol 2");
1477:
1478: debug3("%s: %s:%d", __func__, stdio_forward_host, stdio_forward_port);
1.332 djm 1479:
1.368 djm 1480: if ((in = dup(STDIN_FILENO)) < 0 ||
1481: (out = dup(STDOUT_FILENO)) < 0)
1.332 djm 1482: fatal("channel_connect_stdio_fwd: dup() in/out failed");
1.368 djm 1483: if ((c = channel_connect_stdio_fwd(stdio_forward_host,
1484: stdio_forward_port, in, out)) == NULL)
1485: fatal("%s: channel_connect_stdio_fwd failed", __func__);
1.331 dtucker 1486: channel_register_cleanup(c->self, client_cleanup_stdio_fwd, 0);
1.407 djm 1487: channel_register_open_confirm(c->self, ssh_stdio_confirm, NULL);
1.331 dtucker 1488: }
1489:
1490: static void
1.70 markus 1491: ssh_init_forwarding(void)
1492: {
1.86 markus 1493: int success = 0;
1.70 markus 1494: int i;
1.331 dtucker 1495:
1.70 markus 1496: /* Initiate local TCP/IP port forwardings. */
1497: for (i = 0; i < options.num_local_forwards; i++) {
1.232 djm 1498: debug("Local connections to %.200s:%d forwarded to remote "
1499: "address %.200s:%d",
1.406 millert 1500: (options.local_forwards[i].listen_path != NULL) ?
1501: options.local_forwards[i].listen_path :
1.234 deraadt 1502: (options.local_forwards[i].listen_host == NULL) ?
1.406 millert 1503: (options.fwd_opts.gateway_ports ? "*" : "LOCALHOST") :
1.232 djm 1504: options.local_forwards[i].listen_host,
1505: options.local_forwards[i].listen_port,
1.406 millert 1506: (options.local_forwards[i].connect_path != NULL) ?
1507: options.local_forwards[i].connect_path :
1.232 djm 1508: options.local_forwards[i].connect_host,
1509: options.local_forwards[i].connect_port);
1.158 markus 1510: success += channel_setup_local_fwd_listener(
1.406 millert 1511: &options.local_forwards[i], &options.fwd_opts);
1.70 markus 1512: }
1.283 markus 1513: if (i > 0 && success != i && options.exit_on_forward_failure)
1514: fatal("Could not request local forwarding.");
1.86 markus 1515: if (i > 0 && success == 0)
1516: error("Could not request local forwarding.");
1.70 markus 1517:
1518: /* Initiate remote TCP/IP port forwardings. */
1519: for (i = 0; i < options.num_remote_forwards; i++) {
1.232 djm 1520: debug("Remote connections from %.200s:%d forwarded to "
1521: "local address %.200s:%d",
1.406 millert 1522: (options.remote_forwards[i].listen_path != NULL) ?
1523: options.remote_forwards[i].listen_path :
1.248 djm 1524: (options.remote_forwards[i].listen_host == NULL) ?
1.253 djm 1525: "LOCALHOST" : options.remote_forwards[i].listen_host,
1.232 djm 1526: options.remote_forwards[i].listen_port,
1.406 millert 1527: (options.remote_forwards[i].connect_path != NULL) ?
1528: options.remote_forwards[i].connect_path :
1.232 djm 1529: options.remote_forwards[i].connect_host,
1530: options.remote_forwards[i].connect_port);
1.366 markus 1531: options.remote_forwards[i].handle =
1532: channel_request_remote_forwarding(
1.406 millert 1533: &options.remote_forwards[i]);
1.366 markus 1534: if (options.remote_forwards[i].handle < 0) {
1.283 markus 1535: if (options.exit_on_forward_failure)
1536: fatal("Could not request remote forwarding.");
1537: else
1538: logit("Warning: Could not request remote "
1539: "forwarding.");
1.366 markus 1540: } else {
1541: client_register_global_confirm(ssh_confirm_remote_forward,
1542: &options.remote_forwards[i]);
1.283 markus 1543: }
1.70 markus 1544: }
1.301 djm 1545:
1546: /* Initiate tunnel forwarding. */
1547: if (options.tun_open != SSH_TUNMODE_NO) {
1548: if (client_request_tun_fwd(options.tun_open,
1549: options.tun_local, options.tun_remote) == -1) {
1550: if (options.exit_on_forward_failure)
1551: fatal("Could not request tunnel forwarding.");
1552: else
1553: error("Could not request tunnel forwarding.");
1554: }
1555: }
1.70 markus 1556: }
1557:
1.126 itojun 1558: static void
1.70 markus 1559: check_agent_present(void)
1560: {
1.412 djm 1561: int r;
1562:
1.70 markus 1563: if (options.forward_agent) {
1.254 djm 1564: /* Clear agent forwarding if we don't have an agent. */
1.412 djm 1565: if ((r = ssh_get_authentication_socket(NULL)) != 0) {
1.70 markus 1566: options.forward_agent = 0;
1.412 djm 1567: if (r != SSH_ERR_AGENT_NOT_PRESENT)
1568: debug("ssh_get_authentication_socket: %s",
1569: ssh_err(r));
1570: }
1.70 markus 1571: }
1572: }
1573:
1.126 itojun 1574: static int
1.45 markus 1575: ssh_session(void)
1576: {
1577: int type;
1578: int interactive = 0;
1579: int have_tty = 0;
1580: struct winsize ws;
1581: char *cp;
1.243 djm 1582: const char *display;
1.433 djm 1583: char *proto = NULL, *data = NULL;
1.45 markus 1584:
1.31 markus 1585: /* Enable compression if requested. */
1586: if (options.compression) {
1.316 djm 1587: debug("Requesting compression at level %d.",
1588: options.compression_level);
1.31 markus 1589:
1.316 djm 1590: if (options.compression_level < 1 ||
1591: options.compression_level > 9)
1592: fatal("Compression level must be from 1 (fast) to "
1593: "9 (slow, best).");
1.31 markus 1594:
1595: /* Send the request. */
1596: packet_start(SSH_CMSG_REQUEST_COMPRESSION);
1597: packet_put_int(options.compression_level);
1598: packet_send();
1599: packet_write_wait();
1.156 markus 1600: type = packet_read();
1.31 markus 1601: if (type == SSH_SMSG_SUCCESS)
1602: packet_start_compression(options.compression_level);
1603: else if (type == SSH_SMSG_FAILURE)
1.191 itojun 1604: logit("Warning: Remote host refused compression.");
1.31 markus 1605: else
1.316 djm 1606: packet_disconnect("Protocol error waiting for "
1607: "compression response.");
1.31 markus 1608: }
1609: /* Allocate a pseudo tty if appropriate. */
1610: if (tty_flag) {
1611: debug("Requesting pty.");
1612:
1613: /* Start the packet. */
1614: packet_start(SSH_CMSG_REQUEST_PTY);
1615:
1616: /* Store TERM in the packet. There is no limit on the
1617: length of the string. */
1618: cp = getenv("TERM");
1619: if (!cp)
1620: cp = "";
1.124 markus 1621: packet_put_cstring(cp);
1.31 markus 1622:
1623: /* Store window size in the packet. */
1624: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
1625: memset(&ws, 0, sizeof(ws));
1.269 deraadt 1626: packet_put_int((u_int)ws.ws_row);
1627: packet_put_int((u_int)ws.ws_col);
1628: packet_put_int((u_int)ws.ws_xpixel);
1629: packet_put_int((u_int)ws.ws_ypixel);
1.31 markus 1630:
1631: /* Store tty modes in the packet. */
1.115 stevesk 1632: tty_make_modes(fileno(stdin), NULL);
1.31 markus 1633:
1634: /* Send the packet, and wait for it to leave. */
1635: packet_send();
1636: packet_write_wait();
1637:
1638: /* Read response from the server. */
1.156 markus 1639: type = packet_read();
1.43 markus 1640: if (type == SSH_SMSG_SUCCESS) {
1.31 markus 1641: interactive = 1;
1.45 markus 1642: have_tty = 1;
1.43 markus 1643: } else if (type == SSH_SMSG_FAILURE)
1.316 djm 1644: logit("Warning: Remote host failed or refused to "
1645: "allocate a pseudo tty.");
1.31 markus 1646: else
1.316 djm 1647: packet_disconnect("Protocol error waiting for pty "
1648: "request response.");
1.31 markus 1649: }
1650: /* Request X11 forwarding if enabled and DISPLAY is set. */
1.243 djm 1651: display = getenv("DISPLAY");
1.417 djm 1652: if (display == NULL && options.forward_x11)
1653: debug("X11 forwarding requested but DISPLAY not set");
1.433 djm 1654: if (options.forward_x11 && client_x11_get_proto(display,
1655: options.xauth_location, options.forward_x11_trusted,
1656: options.forward_x11_timeout, &proto, &data) == 0) {
1.50 markus 1657: /* Request forwarding with authentication spoofing. */
1.316 djm 1658: debug("Requesting X11 forwarding with authentication "
1659: "spoofing.");
1.363 djm 1660: x11_request_forwarding_with_spoofing(0, display, proto,
1661: data, 0);
1.31 markus 1662: /* Read response from the server. */
1.156 markus 1663: type = packet_read();
1.31 markus 1664: if (type == SSH_SMSG_SUCCESS) {
1665: interactive = 1;
1.50 markus 1666: } else if (type == SSH_SMSG_FAILURE) {
1.191 itojun 1667: logit("Warning: Remote host denied X11 forwarding.");
1.50 markus 1668: } else {
1.316 djm 1669: packet_disconnect("Protocol error waiting for X11 "
1670: "forwarding");
1.50 markus 1671: }
1.31 markus 1672: }
1673: /* Tell the packet module whether this is an interactive session. */
1.354 djm 1674: packet_set_interactive(interactive,
1675: options.ip_qos_interactive, options.ip_qos_bulk);
1.31 markus 1676:
1677: /* Request authentication agent forwarding if appropriate. */
1.70 markus 1678: check_agent_present();
1679:
1.31 markus 1680: if (options.forward_agent) {
1681: debug("Requesting authentication agent forwarding.");
1682: auth_request_forwarding();
1683:
1684: /* Read response from the server. */
1.156 markus 1685: type = packet_read();
1.155 markus 1686: packet_check_eom();
1.31 markus 1687: if (type != SSH_SMSG_SUCCESS)
1.191 itojun 1688: logit("Warning: Remote host denied authentication agent forwarding.");
1.31 markus 1689: }
1690:
1.70 markus 1691: /* Initiate port forwardings. */
1.368 djm 1692: ssh_init_stdio_forwarding();
1.70 markus 1693: ssh_init_forwarding();
1.305 dtucker 1694:
1695: /* Execute a local command */
1696: if (options.local_command != NULL &&
1697: options.permit_local_command)
1698: ssh_local_cmd(options.local_command);
1.34 markus 1699:
1.318 djm 1700: /*
1701: * If requested and we are not interested in replies to remote
1702: * forwarding requests, then let ssh continue in the background.
1703: */
1.344 djm 1704: if (fork_after_authentication_flag) {
1705: if (options.exit_on_forward_failure &&
1706: options.num_remote_forwards > 0) {
1707: debug("deferring postauth fork until remote forward "
1708: "confirmation received");
1709: } else
1710: fork_postauth();
1.318 djm 1711: }
1.31 markus 1712:
1.33 markus 1713: /*
1714: * If a command was specified on the command line, execute the
1715: * command now. Otherwise request the server to start a shell.
1716: */
1.31 markus 1717: if (buffer_len(&command) > 0) {
1718: int len = buffer_len(&command);
1719: if (len > 900)
1720: len = 900;
1.316 djm 1721: debug("Sending command: %.*s", len,
1722: (u_char *)buffer_ptr(&command));
1.31 markus 1723: packet_start(SSH_CMSG_EXEC_CMD);
1724: packet_put_string(buffer_ptr(&command), buffer_len(&command));
1725: packet_send();
1726: packet_write_wait();
1727: } else {
1728: debug("Requesting shell.");
1729: packet_start(SSH_CMSG_EXEC_SHELL);
1730: packet_send();
1731: packet_write_wait();
1732: }
1733:
1734: /* Enter the interactive session. */
1.119 stevesk 1735: return client_loop(have_tty, tty_flag ?
1736: options.escape_char : SSH_ESCAPECHAR_NONE, 0);
1.89 markus 1737: }
1738:
1.214 djm 1739: /* request pty/x11/agent/tcpfwd/shell for channel */
1740: static void
1.337 djm 1741: ssh_session2_setup(int id, int success, void *arg)
1.214 djm 1742: {
1.215 djm 1743: extern char **environ;
1.243 djm 1744: const char *display;
1745: int interactive = tty_flag;
1.433 djm 1746: char *proto = NULL, *data = NULL;
1.337 djm 1747:
1748: if (!success)
1749: return; /* No need for error message, channels code sens one */
1.215 djm 1750:
1.248 djm 1751: display = getenv("DISPLAY");
1.417 djm 1752: if (display == NULL && options.forward_x11)
1753: debug("X11 forwarding requested but DISPLAY not set");
1.433 djm 1754: if (options.forward_x11 && client_x11_get_proto(display,
1755: options.xauth_location, options.forward_x11_trusted,
1756: options.forward_x11_timeout, &proto, &data) == 0) {
1.50 markus 1757: /* Request forwarding with authentication spoofing. */
1.316 djm 1758: debug("Requesting X11 forwarding with authentication "
1759: "spoofing.");
1.363 djm 1760: x11_request_forwarding_with_spoofing(id, display, proto,
1761: data, 1);
1762: client_expect_confirm(id, "X11 forwarding", CONFIRM_WARN);
1763: /* XXX exit_on_forward_failure */
1.80 markus 1764: interactive = 1;
1.50 markus 1765: }
1766:
1.70 markus 1767: check_agent_present();
1768: if (options.forward_agent) {
1769: debug("Requesting authentication agent forwarding.");
1770: channel_request_start(id, "auth-agent-req@openssh.com", 0);
1771: packet_send();
1.212 djm 1772: }
1.369 dtucker 1773:
1774: /* Tell the packet module whether this is an interactive session. */
1775: packet_set_interactive(interactive,
1776: options.ip_qos_interactive, options.ip_qos_bulk);
1.212 djm 1777:
1.214 djm 1778: client_session2_setup(id, tty_flag, subsystem_flag, getenv("TERM"),
1.311 djm 1779: NULL, fileno(stdin), &command, environ);
1.45 markus 1780: }
1781:
1.143 markus 1782: /* open new channel for a session */
1.126 itojun 1783: static int
1.143 markus 1784: ssh_session2_open(void)
1.45 markus 1785: {
1.118 markus 1786: Channel *c;
1787: int window, packetmax, in, out, err;
1.60 markus 1788:
1.62 markus 1789: if (stdin_null_flag) {
1.93 itojun 1790: in = open(_PATH_DEVNULL, O_RDONLY);
1.62 markus 1791: } else {
1792: in = dup(STDIN_FILENO);
1793: }
1.60 markus 1794: out = dup(STDOUT_FILENO);
1795: err = dup(STDERR_FILENO);
1.45 markus 1796:
1797: if (in < 0 || out < 0 || err < 0)
1.62 markus 1798: fatal("dup() in/out/err failed");
1.45 markus 1799:
1.69 markus 1800: /* enable nonblocking unless tty */
1801: if (!isatty(in))
1802: set_nonblock(in);
1803: if (!isatty(out))
1804: set_nonblock(out);
1805: if (!isatty(err))
1806: set_nonblock(err);
1807:
1.65 markus 1808: window = CHAN_SES_WINDOW_DEFAULT;
1809: packetmax = CHAN_SES_PACKET_DEFAULT;
1.164 markus 1810: if (tty_flag) {
1811: window >>= 1;
1812: packetmax >>= 1;
1.45 markus 1813: }
1.118 markus 1814: c = channel_new(
1.45 markus 1815: "session", SSH_CHANNEL_OPENING, in, out, err,
1.65 markus 1816: window, packetmax, CHAN_EXTENDED_WRITE,
1.192 markus 1817: "client-session", /*nonblock*/0);
1.45 markus 1818:
1.143 markus 1819: debug3("ssh_session2_open: channel_new: %d", c->self);
1.106 markus 1820:
1.122 markus 1821: channel_send_open(c->self);
1.143 markus 1822: if (!no_shell_flag)
1.310 djm 1823: channel_register_open_confirm(c->self,
1824: ssh_session2_setup, NULL);
1.106 markus 1825:
1.118 markus 1826: return c->self;
1.106 markus 1827: }
1828:
1.126 itojun 1829: static int
1.106 markus 1830: ssh_session2(void)
1831: {
1.143 markus 1832: int id = -1;
1.106 markus 1833:
1834: /* XXX should be pre-session */
1.368 djm 1835: if (!options.control_persist)
1836: ssh_init_stdio_forwarding();
1.106 markus 1837: ssh_init_forwarding();
1838:
1.344 djm 1839: /* Start listening for multiplex clients */
1840: muxserver_listen();
1841:
1842: /*
1.368 djm 1843: * If we are in control persist mode and have a working mux listen
1844: * socket, then prepare to background ourselves and have a foreground
1845: * client attach as a control slave.
1846: * NB. we must save copies of the flags that we override for
1.344 djm 1847: * the backgrounding, since we defer attachment of the slave until
1848: * after the connection is fully established (in particular,
1849: * async rfwd replies have been received for ExitOnForwardFailure).
1850: */
1851: if (options.control_persist && muxserver_sock != -1) {
1852: ostdin_null_flag = stdin_null_flag;
1853: ono_shell_flag = no_shell_flag;
1.359 djm 1854: orequest_tty = options.request_tty;
1.344 djm 1855: otty_flag = tty_flag;
1856: stdin_null_flag = 1;
1857: no_shell_flag = 1;
1858: tty_flag = 0;
1859: if (!fork_after_authentication_flag)
1860: need_controlpersist_detach = 1;
1861: fork_after_authentication_flag = 1;
1862: }
1.368 djm 1863: /*
1864: * ControlPersist mux listen socket setup failed, attempt the
1865: * stdio forward setup that we skipped earlier.
1866: */
1867: if (options.control_persist && muxserver_sock == -1)
1868: ssh_init_stdio_forwarding();
1.344 djm 1869:
1.143 markus 1870: if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN))
1871: id = ssh_session2_open();
1.379 djm 1872: else {
1873: packet_set_interactive(
1874: options.control_master == SSHCTL_MASTER_NO,
1875: options.ip_qos_interactive, options.ip_qos_bulk);
1876: }
1.314 djm 1877:
1878: /* If we don't expect to open a new session, then disallow it */
1.319 markus 1879: if (options.control_master == SSHCTL_MASTER_NO &&
1880: (datafellows & SSH_NEW_OPENSSH)) {
1.314 djm 1881: debug("Requesting no-more-sessions@openssh.com");
1882: packet_start(SSH2_MSG_GLOBAL_REQUEST);
1883: packet_put_cstring("no-more-sessions@openssh.com");
1884: packet_put_char(0);
1885: packet_send();
1886: }
1.255 reyk 1887:
1888: /* Execute a local command */
1889: if (options.local_command != NULL &&
1890: options.permit_local_command)
1891: ssh_local_cmd(options.local_command);
1.301 djm 1892:
1.342 djm 1893: /*
1894: * If requested and we are not interested in replies to remote
1895: * forwarding requests, then let ssh continue in the background.
1896: */
1.344 djm 1897: if (fork_after_authentication_flag) {
1898: if (options.exit_on_forward_failure &&
1899: options.num_remote_forwards > 0) {
1900: debug("deferring postauth fork until remote forward "
1901: "confirmation received");
1902: } else
1903: fork_postauth();
1.318 djm 1904: }
1.31 markus 1905:
1.119 stevesk 1906: return client_loop(tty_flag, tty_flag ?
1907: options.escape_char : SSH_ESCAPECHAR_NONE, id);
1.72 markus 1908: }
1909:
1.426 djm 1910: /* Loads all IdentityFile and CertificateFile keys */
1.126 itojun 1911: static void
1.104 markus 1912: load_public_identity_files(void)
1913: {
1.275 djm 1914: char *filename, *cp, thishost[NI_MAXHOST];
1.306 deraadt 1915: char *pwdir = NULL, *pwname = NULL;
1.104 markus 1916: Key *public;
1.275 djm 1917: struct passwd *pw;
1.426 djm 1918: int i;
1919: u_int n_ids, n_certs;
1.335 djm 1920: char *identity_files[SSH_MAX_IDENTITY_FILES];
1921: Key *identity_keys[SSH_MAX_IDENTITY_FILES];
1.426 djm 1922: char *certificate_files[SSH_MAX_CERTIFICATE_FILES];
1923: struct sshkey *certificates[SSH_MAX_CERTIFICATE_FILES];
1.333 markus 1924: #ifdef ENABLE_PKCS11
1.167 markus 1925: Key **keys;
1.333 markus 1926: int nkeys;
1.335 djm 1927: #endif /* PKCS11 */
1.104 markus 1928:
1.426 djm 1929: n_ids = n_certs = 0;
1.398 tedu 1930: memset(identity_files, 0, sizeof(identity_files));
1931: memset(identity_keys, 0, sizeof(identity_keys));
1.426 djm 1932: memset(certificate_files, 0, sizeof(certificate_files));
1933: memset(certificates, 0, sizeof(certificates));
1.335 djm 1934:
1935: #ifdef ENABLE_PKCS11
1.333 markus 1936: if (options.pkcs11_provider != NULL &&
1.167 markus 1937: options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
1.333 markus 1938: (pkcs11_init(!options.batch_mode) == 0) &&
1939: (nkeys = pkcs11_add_provider(options.pkcs11_provider, NULL,
1940: &keys)) > 0) {
1941: for (i = 0; i < nkeys; i++) {
1.335 djm 1942: if (n_ids >= SSH_MAX_IDENTITY_FILES) {
1943: key_free(keys[i]);
1944: continue;
1945: }
1946: identity_keys[n_ids] = keys[i];
1947: identity_files[n_ids] =
1.333 markus 1948: xstrdup(options.pkcs11_provider); /* XXX */
1.335 djm 1949: n_ids++;
1.167 markus 1950: }
1.378 djm 1951: free(keys);
1.127 markus 1952: }
1.333 markus 1953: #endif /* ENABLE_PKCS11 */
1.275 djm 1954: if ((pw = getpwuid(original_real_uid)) == NULL)
1955: fatal("load_public_identity_files: getpwuid failed");
1.307 dtucker 1956: pwname = xstrdup(pw->pw_name);
1957: pwdir = xstrdup(pw->pw_dir);
1.275 djm 1958: if (gethostname(thishost, sizeof(thishost)) == -1)
1959: fatal("load_public_identity_files: gethostname: %s",
1960: strerror(errno));
1.335 djm 1961: for (i = 0; i < options.num_identity_files; i++) {
1.373 djm 1962: if (n_ids >= SSH_MAX_IDENTITY_FILES ||
1963: strcasecmp(options.identity_files[i], "none") == 0) {
1.378 djm 1964: free(options.identity_files[i]);
1.426 djm 1965: options.identity_files[i] = NULL;
1.335 djm 1966: continue;
1967: }
1.275 djm 1968: cp = tilde_expand_filename(options.identity_files[i],
1.131 millert 1969: original_real_uid);
1.306 deraadt 1970: filename = percent_expand(cp, "d", pwdir,
1971: "u", pwname, "l", thishost, "h", host,
1.275 djm 1972: "r", options.user, (char *)NULL);
1.378 djm 1973: free(cp);
1.131 millert 1974: public = key_load_public(filename, NULL);
1975: debug("identity file %s type %d", filename,
1976: public ? public->type : -1);
1.378 djm 1977: free(options.identity_files[i]);
1.335 djm 1978: identity_files[n_ids] = filename;
1979: identity_keys[n_ids] = public;
1980:
1981: if (++n_ids >= SSH_MAX_IDENTITY_FILES)
1982: continue;
1983:
1.426 djm 1984: /*
1985: * If no certificates have been explicitly listed then try
1986: * to add the default certificate variant too.
1987: */
1988: if (options.num_certificate_files != 0)
1989: continue;
1.335 djm 1990: xasprintf(&cp, "%s-cert", filename);
1991: public = key_load_public(cp, NULL);
1992: debug("identity file %s type %d", cp,
1993: public ? public->type : -1);
1994: if (public == NULL) {
1.378 djm 1995: free(cp);
1.335 djm 1996: continue;
1997: }
1998: if (!key_is_cert(public)) {
1999: debug("%s: key %s type %s is not a certificate",
2000: __func__, cp, key_type(public));
2001: key_free(public);
1.378 djm 2002: free(cp);
1.335 djm 2003: continue;
2004: }
2005: identity_keys[n_ids] = public;
1.426 djm 2006: identity_files[n_ids] = cp;
1.335 djm 2007: n_ids++;
2008: }
1.426 djm 2009:
2010: if (options.num_certificate_files > SSH_MAX_CERTIFICATE_FILES)
2011: fatal("%s: too many certificates", __func__);
2012: for (i = 0; i < options.num_certificate_files; i++) {
2013: cp = tilde_expand_filename(options.certificate_files[i],
2014: original_real_uid);
2015: filename = percent_expand(cp, "d", pwdir,
2016: "u", pwname, "l", thishost, "h", host,
2017: "r", options.user, (char *)NULL);
2018: free(cp);
2019:
2020: public = key_load_public(filename, NULL);
2021: debug("certificate file %s type %d", filename,
2022: public ? public->type : -1);
2023: free(options.certificate_files[i]);
2024: options.certificate_files[i] = NULL;
2025: if (public == NULL) {
2026: free(filename);
2027: continue;
2028: }
2029: if (!key_is_cert(public)) {
2030: debug("%s: key %s type %s is not a certificate",
2031: __func__, filename, key_type(public));
2032: key_free(public);
2033: free(filename);
2034: continue;
2035: }
2036: certificate_files[n_certs] = filename;
2037: certificates[n_certs] = public;
2038: ++n_certs;
2039: }
2040:
1.335 djm 2041: options.num_identity_files = n_ids;
2042: memcpy(options.identity_files, identity_files, sizeof(identity_files));
2043: memcpy(options.identity_keys, identity_keys, sizeof(identity_keys));
1.426 djm 2044:
2045: options.num_certificate_files = n_certs;
2046: memcpy(options.certificate_files,
2047: certificate_files, sizeof(certificate_files));
2048: memcpy(options.certificates, certificates, sizeof(certificates));
1.335 djm 2049:
1.398 tedu 2050: explicit_bzero(pwname, strlen(pwname));
1.378 djm 2051: free(pwname);
1.398 tedu 2052: explicit_bzero(pwdir, strlen(pwdir));
1.378 djm 2053: free(pwdir);
1.214 djm 2054: }
1.352 djm 2055:
2056: static void
2057: main_sigchld_handler(int sig)
2058: {
2059: int save_errno = errno;
2060: pid_t pid;
2061: int status;
2062:
2063: while ((pid = waitpid(-1, &status, WNOHANG)) > 0 ||
2064: (pid < 0 && errno == EINTR))
2065: ;
2066:
2067: signal(sig, main_sigchld_handler);
2068: errno = save_errno;
2069: }
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