Annotation of src/usr.bin/ssh/ssh.c, Revision 1.422
1.422 ! dtucker 1: /* $OpenBSD: ssh.c,v 1.421 2015/09/04 04:56:09 djm Exp $ */
1.1 deraadt 2: /*
1.32 deraadt 3: * Author: Tatu Ylonen <ylo@cs.hut.fi>
4: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5: * All rights reserved
6: * Ssh client program. This program can be used to log into a remote machine.
7: * The software supports strong authentication, encryption, and forwarding
8: * of X11, TCP/IP, and authentication connections.
9: *
1.64 deraadt 10: * As far as I am concerned, the code I have written for this software
11: * can be used freely for any purpose. Any derived versions of this
12: * software must be clearly marked as such, and if the derived work is
13: * incompatible with the protocol description in the RFC file, it must be
14: * called by a name other than "ssh" or "Secure Shell".
15: *
16: * Copyright (c) 1999 Niels Provos. All rights reserved.
1.202 markus 17: * Copyright (c) 2000, 2001, 2002, 2003 Markus Friedl. All rights reserved.
1.64 deraadt 18: *
19: * Modified to work with SSL by Niels Provos <provos@citi.umich.edu>
20: * in Canada (German citizen).
21: *
22: * Redistribution and use in source and binary forms, with or without
23: * modification, are permitted provided that the following conditions
24: * are met:
25: * 1. Redistributions of source code must retain the above copyright
26: * notice, this list of conditions and the following disclaimer.
27: * 2. Redistributions in binary form must reproduce the above copyright
28: * notice, this list of conditions and the following disclaimer in the
29: * documentation and/or other materials provided with the distribution.
30: *
31: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
32: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
33: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
34: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
35: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
36: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
37: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
38: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
39: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
40: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.32 deraadt 41: */
1.1 deraadt 42:
1.293 deraadt 43: #include <sys/types.h>
1.312 djm 44: #include <sys/ioctl.h>
45: #include <sys/queue.h>
1.259 stevesk 46: #include <sys/resource.h>
1.280 stevesk 47: #include <sys/socket.h>
1.264 stevesk 48: #include <sys/stat.h>
1.312 djm 49: #include <sys/time.h>
1.352 djm 50: #include <sys/wait.h>
1.258 stevesk 51:
1.265 stevesk 52: #include <ctype.h>
1.285 stevesk 53: #include <errno.h>
1.281 stevesk 54: #include <fcntl.h>
1.286 stevesk 55: #include <netdb.h>
1.258 stevesk 56: #include <paths.h>
1.279 stevesk 57: #include <pwd.h>
1.263 stevesk 58: #include <signal.h>
1.287 stevesk 59: #include <stddef.h>
1.291 stevesk 60: #include <stdio.h>
1.290 stevesk 61: #include <stdlib.h>
1.289 stevesk 62: #include <string.h>
1.288 stevesk 63: #include <unistd.h>
1.414 deraadt 64: #include <limits.h>
1.49 markus 65:
1.402 markus 66: #ifdef WITH_OPENSSL
1.49 markus 67: #include <openssl/evp.h>
1.72 markus 68: #include <openssl/err.h>
1.402 markus 69: #endif
1.1 deraadt 70:
1.293 deraadt 71: #include "xmalloc.h"
1.84 markus 72: #include "ssh.h"
73: #include "ssh1.h"
74: #include "ssh2.h"
1.341 djm 75: #include "canohost.h"
1.84 markus 76: #include "compat.h"
77: #include "cipher.h"
1.405 djm 78: #include "digest.h"
1.1 deraadt 79: #include "packet.h"
80: #include "buffer.h"
1.123 markus 81: #include "channels.h"
1.49 markus 82: #include "key.h"
1.58 markus 83: #include "authfd.h"
1.49 markus 84: #include "authfile.h"
1.83 markus 85: #include "pathnames.h"
1.214 djm 86: #include "dispatch.h"
1.81 markus 87: #include "clientloop.h"
1.84 markus 88: #include "log.h"
1.406 millert 89: #include "misc.h"
1.84 markus 90: #include "readconf.h"
91: #include "sshconnect.h"
1.95 markus 92: #include "kex.h"
93: #include "mac.h"
1.213 deraadt 94: #include "sshpty.h"
1.212 djm 95: #include "match.h"
1.214 djm 96: #include "msg.h"
1.225 dtucker 97: #include "uidswap.h"
1.327 andreas 98: #include "roaming.h"
1.278 stevesk 99: #include "version.h"
1.412 djm 100: #include "ssherr.h"
1.420 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:
1.331 dtucker 140: /* forward stdio to remote host and port */
141: char *stdio_forward_host = NULL;
142: int stdio_forward_port = 0;
143:
1.33 markus 144: /*
145: * General data structure for command line options and options configurable
146: * in configuration files. See readconf.h.
147: */
1.1 deraadt 148: Options options;
149:
1.139 markus 150: /* optional user configfile */
151: char *config = NULL;
152:
1.33 markus 153: /*
154: * Name of the host we are connecting to. This is the name given on the
155: * command line, or the HostName specified for the user-supplied name in a
156: * configuration file.
157: */
1.1 deraadt 158: char *host;
159:
1.22 provos 160: /* socket address the host resolves to */
1.37 markus 161: struct sockaddr_storage hostaddr;
1.1 deraadt 162:
1.112 markus 163: /* Private host keys. */
1.173 markus 164: Sensitive sensitive_data;
1.1 deraadt 165:
1.10 dugsong 166: /* Original real UID. */
167: uid_t original_real_uid;
1.177 markus 168: uid_t original_effective_uid;
1.1 deraadt 169:
1.45 markus 170: /* command to be executed */
171: Buffer command;
172:
1.85 djm 173: /* Should we execute a command or invoke a subsystem? */
174: int subsystem_flag = 0;
175:
1.170 markus 176: /* # of replies received for global requests */
1.315 djm 177: static int remote_forward_confirms_received = 0;
1.170 markus 178:
1.313 djm 179: /* mux.c */
180: extern int muxserver_sock;
181: extern u_int muxclient_command;
182:
1.1 deraadt 183: /* Prints a help message to the user. This function never returns. */
184:
1.126 itojun 185: static void
1.93 itojun 186: usage(void)
1.1 deraadt 187: {
1.208 markus 188: fprintf(stderr,
1.409 jmc 189: "usage: ssh [-1246AaCfGgKkMNnqsTtVvXxYy] [-b bind_address] [-c cipher_spec]\n"
1.375 dtucker 190: " [-D [bind_address:]port] [-E log_file] [-e escape_char]\n"
191: " [-F configfile] [-I pkcs11] [-i identity_file]\n"
1.419 millert 192: " [-L address] [-l login_name] [-m mac_spec]\n"
1.395 jmc 193: " [-O ctl_cmd] [-o option] [-p port]\n"
194: " [-Q cipher | cipher-auth | mac | kex | key]\n"
1.419 millert 195: " [-R address] [-S ctl_path] [-W host:port]\n"
1.395 jmc 196: " [-w local_tun[:remote_tun]] [user@]hostname [command]\n"
1.208 markus 197: );
1.257 dtucker 198: exit(255);
1.1 deraadt 199: }
200:
1.126 itojun 201: static int ssh_session(void);
202: static int ssh_session2(void);
203: static void load_public_identity_files(void);
1.352 djm 204: static void main_sigchld_handler(int);
1.312 djm 205:
206: /* from muxclient.c */
207: void muxclient(const char *);
208: void muxserver_listen(void);
1.45 markus 209:
1.361 djm 210: /* ~/ expand a list of paths. NB. assumes path[n] is heap-allocated. */
211: static void
212: tilde_expand_paths(char **paths, u_int num_paths)
213: {
214: u_int i;
215: char *cp;
216:
217: for (i = 0; i < num_paths; i++) {
218: cp = tilde_expand_filename(paths[i], original_real_uid);
1.378 djm 219: free(paths[i]);
1.361 djm 220: paths[i] = cp;
221: }
222: }
223:
1.400 djm 224: /*
225: * Attempt to resolve a host name / port to a set of addresses and
226: * optionally return any CNAMEs encountered along the way.
227: * Returns NULL on failure.
228: * NB. this function must operate with a options having undefined members.
229: */
1.385 djm 230: static struct addrinfo *
1.400 djm 231: resolve_host(const char *name, int port, int logerr, char *cname, size_t clen)
1.385 djm 232: {
233: char strport[NI_MAXSERV];
234: struct addrinfo hints, *res;
235: int gaierr, loglevel = SYSLOG_LEVEL_DEBUG1;
236:
1.400 djm 237: if (port <= 0)
238: port = default_ssh_port();
239:
1.385 djm 240: snprintf(strport, sizeof strport, "%u", port);
1.398 tedu 241: memset(&hints, 0, sizeof(hints));
1.400 djm 242: hints.ai_family = options.address_family == -1 ?
243: AF_UNSPEC : options.address_family;
1.385 djm 244: hints.ai_socktype = SOCK_STREAM;
245: if (cname != NULL)
246: hints.ai_flags = AI_CANONNAME;
247: if ((gaierr = getaddrinfo(name, strport, &hints, &res)) != 0) {
248: if (logerr || (gaierr != EAI_NONAME && gaierr != EAI_NODATA))
249: loglevel = SYSLOG_LEVEL_ERROR;
250: do_log2(loglevel, "%s: Could not resolve hostname %.100s: %s",
251: __progname, name, ssh_gai_strerror(gaierr));
252: return NULL;
253: }
254: if (cname != NULL && res->ai_canonname != NULL) {
255: if (strlcpy(cname, res->ai_canonname, clen) >= clen) {
256: error("%s: host \"%s\" cname \"%s\" too long (max %lu)",
257: __func__, name, res->ai_canonname, (u_long)clen);
258: if (clen > 0)
259: *cname = '\0';
260: }
261: }
262: return res;
263: }
264:
265: /*
1.413 djm 266: * Attempt to resolve a numeric host address / port to a single address.
267: * Returns a canonical address string.
268: * Returns NULL on failure.
269: * NB. this function must operate with a options having undefined members.
270: */
271: static struct addrinfo *
272: resolve_addr(const char *name, int port, char *caddr, size_t clen)
273: {
274: char addr[NI_MAXHOST], strport[NI_MAXSERV];
275: struct addrinfo hints, *res;
276: int gaierr;
277:
278: if (port <= 0)
279: port = default_ssh_port();
280: snprintf(strport, sizeof strport, "%u", port);
281: memset(&hints, 0, sizeof(hints));
282: hints.ai_family = options.address_family == -1 ?
283: AF_UNSPEC : options.address_family;
284: hints.ai_socktype = SOCK_STREAM;
285: hints.ai_flags = AI_NUMERICHOST|AI_NUMERICSERV;
286: if ((gaierr = getaddrinfo(name, strport, &hints, &res)) != 0) {
287: debug2("%s: could not resolve name %.100s as address: %s",
288: __func__, name, ssh_gai_strerror(gaierr));
289: return NULL;
290: }
291: if (res == NULL) {
292: debug("%s: getaddrinfo %.100s returned no addresses",
293: __func__, name);
294: return NULL;
295: }
296: if (res->ai_next != NULL) {
297: debug("%s: getaddrinfo %.100s returned multiple addresses",
298: __func__, name);
299: goto fail;
300: }
301: if ((gaierr = getnameinfo(res->ai_addr, res->ai_addrlen,
302: addr, sizeof(addr), NULL, 0, NI_NUMERICHOST)) != 0) {
303: debug("%s: Could not format address for name %.100s: %s",
304: __func__, name, ssh_gai_strerror(gaierr));
305: goto fail;
306: }
307: if (strlcpy(caddr, addr, clen) >= clen) {
308: error("%s: host \"%s\" addr \"%s\" too long (max %lu)",
309: __func__, name, addr, (u_long)clen);
310: if (clen > 0)
311: *caddr = '\0';
312: fail:
313: freeaddrinfo(res);
314: return NULL;
315: }
316: return res;
317: }
318:
319: /*
1.385 djm 320: * Check whether the cname is a permitted replacement for the hostname
321: * and perform the replacement if it is.
1.400 djm 322: * NB. this function must operate with a options having undefined members.
1.385 djm 323: */
324: static int
325: check_follow_cname(char **namep, const char *cname)
326: {
327: int i;
328: struct allowed_cname *rule;
329:
330: if (*cname == '\0' || options.num_permitted_cnames == 0 ||
331: strcmp(*namep, cname) == 0)
332: return 0;
1.386 djm 333: if (options.canonicalize_hostname == SSH_CANONICALISE_NO)
1.385 djm 334: return 0;
335: /*
1.386 djm 336: * Don't attempt to canonicalize names that will be interpreted by
1.385 djm 337: * a proxy unless the user specifically requests so.
338: */
1.400 djm 339: if (!option_clear_or_none(options.proxy_command) &&
1.386 djm 340: options.canonicalize_hostname != SSH_CANONICALISE_ALWAYS)
1.385 djm 341: return 0;
342: debug3("%s: check \"%s\" CNAME \"%s\"", __func__, *namep, cname);
343: for (i = 0; i < options.num_permitted_cnames; i++) {
344: rule = options.permitted_cnames + i;
1.418 djm 345: if (match_pattern_list(*namep, rule->source_list, 1) != 1 ||
346: match_pattern_list(cname, rule->target_list, 1) != 1)
1.385 djm 347: continue;
1.386 djm 348: verbose("Canonicalized DNS aliased hostname "
1.385 djm 349: "\"%s\" => \"%s\"", *namep, cname);
350: free(*namep);
351: *namep = xstrdup(cname);
352: return 1;
353: }
354: return 0;
355: }
356:
357: /*
358: * Attempt to resolve the supplied hostname after applying the user's
1.387 djm 359: * canonicalization rules. Returns the address list for the host or NULL
360: * if no name was found after canonicalization.
1.400 djm 361: * NB. this function must operate with a options having undefined members.
1.385 djm 362: */
363: static struct addrinfo *
1.400 djm 364: resolve_canonicalize(char **hostp, int port)
1.385 djm 365: {
366: int i, ndots;
1.413 djm 367: char *cp, *fullhost, newname[NI_MAXHOST];
1.385 djm 368: struct addrinfo *addrs;
369:
1.386 djm 370: if (options.canonicalize_hostname == SSH_CANONICALISE_NO)
1.385 djm 371: return NULL;
1.400 djm 372:
1.385 djm 373: /*
1.386 djm 374: * Don't attempt to canonicalize names that will be interpreted by
1.385 djm 375: * a proxy unless the user specifically requests so.
376: */
1.400 djm 377: if (!option_clear_or_none(options.proxy_command) &&
1.386 djm 378: options.canonicalize_hostname != SSH_CANONICALISE_ALWAYS)
1.385 djm 379: return NULL;
1.400 djm 380:
1.413 djm 381: /* Try numeric hostnames first */
382: if ((addrs = resolve_addr(*hostp, port,
383: newname, sizeof(newname))) != NULL) {
384: debug2("%s: hostname %.100s is address", __func__, *hostp);
385: if (strcasecmp(*hostp, newname) != 0) {
386: debug2("%s: canonicalised address \"%s\" => \"%s\"",
387: __func__, *hostp, newname);
388: free(*hostp);
389: *hostp = xstrdup(newname);
390: }
391: return addrs;
392: }
393:
1.387 djm 394: /* Don't apply canonicalization to sufficiently-qualified hostnames */
1.385 djm 395: ndots = 0;
396: for (cp = *hostp; *cp != '\0'; cp++) {
397: if (*cp == '.')
398: ndots++;
399: }
1.386 djm 400: if (ndots > options.canonicalize_max_dots) {
401: debug3("%s: not canonicalizing hostname \"%s\" (max dots %d)",
402: __func__, *hostp, options.canonicalize_max_dots);
1.385 djm 403: return NULL;
404: }
405: /* Attempt each supplied suffix */
406: for (i = 0; i < options.num_canonical_domains; i++) {
1.413 djm 407: *newname = '\0';
1.385 djm 408: xasprintf(&fullhost, "%s.%s.", *hostp,
409: options.canonical_domains[i]);
1.400 djm 410: debug3("%s: attempting \"%s\" => \"%s\"", __func__,
411: *hostp, fullhost);
412: if ((addrs = resolve_host(fullhost, port, 0,
1.413 djm 413: newname, sizeof(newname))) == NULL) {
1.385 djm 414: free(fullhost);
415: continue;
416: }
417: /* Remove trailing '.' */
418: fullhost[strlen(fullhost) - 1] = '\0';
419: /* Follow CNAME if requested */
1.413 djm 420: if (!check_follow_cname(&fullhost, newname)) {
1.386 djm 421: debug("Canonicalized hostname \"%s\" => \"%s\"",
1.385 djm 422: *hostp, fullhost);
423: }
424: free(*hostp);
425: *hostp = fullhost;
426: return addrs;
427: }
1.386 djm 428: if (!options.canonicalize_fallback_local)
1.400 djm 429: fatal("%s: Could not resolve host \"%s\"", __progname, *hostp);
430: debug2("%s: host %s not found in any suffix", __func__, *hostp);
1.385 djm 431: return NULL;
432: }
433:
1.32 deraadt 434: /*
1.400 djm 435: * Read per-user configuration file. Ignore the system wide config
436: * file if the user specifies a config file on the command line.
437: */
438: static void
1.408 djm 439: process_config_files(const char *host_arg, struct passwd *pw, int post_canon)
1.400 djm 440: {
1.414 deraadt 441: char buf[PATH_MAX];
1.400 djm 442: int r;
443:
444: if (config != NULL) {
445: if (strcasecmp(config, "none") != 0 &&
1.408 djm 446: !read_config_file(config, pw, host, host_arg, &options,
447: SSHCONF_USERCONF | (post_canon ? SSHCONF_POSTCANON : 0)))
1.400 djm 448: fatal("Can't open user config file %.100s: "
449: "%.100s", config, strerror(errno));
450: } else {
451: r = snprintf(buf, sizeof buf, "%s/%s", pw->pw_dir,
452: _PATH_SSH_USER_CONFFILE);
453: if (r > 0 && (size_t)r < sizeof(buf))
1.408 djm 454: (void)read_config_file(buf, pw, host, host_arg,
455: &options, SSHCONF_CHECKPERM | SSHCONF_USERCONF |
456: (post_canon ? SSHCONF_POSTCANON : 0));
1.400 djm 457:
458: /* Read systemwide configuration file after user config. */
1.408 djm 459: (void)read_config_file(_PATH_HOST_CONFIG_FILE, pw,
460: host, host_arg, &options,
461: post_canon ? SSHCONF_POSTCANON : 0);
462: }
463: }
464:
465: /* Rewrite the port number in an addrinfo list of addresses */
466: static void
467: set_addrinfo_port(struct addrinfo *addrs, int port)
468: {
469: struct addrinfo *addr;
470:
471: for (addr = addrs; addr != NULL; addr = addr->ai_next) {
472: switch (addr->ai_family) {
473: case AF_INET:
474: ((struct sockaddr_in *)addr->ai_addr)->
475: sin_port = htons(port);
476: break;
477: case AF_INET6:
478: ((struct sockaddr_in6 *)addr->ai_addr)->
479: sin6_port = htons(port);
480: break;
481: }
1.400 djm 482: }
483: }
484:
485: /*
1.32 deraadt 486: * Main program for the ssh client.
487: */
1.2 provos 488: int
489: main(int ac, char **av)
1.1 deraadt 490: {
1.408 djm 491: int i, r, opt, exit_status, use_syslog, config_test = 0;
1.414 deraadt 492: char *p, *cp, *line, *argv0, buf[PATH_MAX], *host_arg, *logfile;
1.358 djm 493: char thishost[NI_MAXHOST], shorthost[NI_MAXHOST], portstr[NI_MAXSERV];
1.385 djm 494: char cname[NI_MAXHOST];
1.31 markus 495: struct stat st;
1.98 markus 496: struct passwd *pw;
1.382 djm 497: int timeout_ms;
1.144 stevesk 498: extern int optind, optreset;
499: extern char *optarg;
1.406 millert 500: struct Forward fwd;
1.385 djm 501: struct addrinfo *addrs = NULL;
1.405 djm 502: struct ssh_digest_ctx *md;
503: u_char conn_hash[SSH_DIGEST_MAX_LENGTH];
504: char *conn_hash_hex;
1.250 djm 505:
506: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
507: sanitise_stdfd();
1.31 markus 508:
1.33 markus 509: /*
1.346 djm 510: * Discard other fds that are hanging around. These can cause problem
511: * with backgrounded ssh processes started by ControlPersist.
512: */
513: closefrom(STDERR_FILENO + 1);
514:
515: /*
1.33 markus 516: * Save the original real uid. It will be needed later (uid-swapping
517: * may clobber the real uid).
518: */
1.31 markus 519: original_real_uid = getuid();
520: original_effective_uid = geteuid();
521:
1.184 stevesk 522: /*
523: * Use uid-swapping to give up root privileges for the duration of
524: * option processing. We will re-instantiate the rights when we are
525: * ready to create the privileged port, and will permanently drop
526: * them when the port has been created (actually, when the connection
527: * has been made, as we may need to create the port several times).
528: */
529: PRIV_END;
530:
1.31 markus 531: /* If we are installed setuid root be careful to not drop core. */
532: if (original_real_uid != original_effective_uid) {
533: struct rlimit rlim;
534: rlim.rlim_cur = rlim.rlim_max = 0;
535: if (setrlimit(RLIMIT_CORE, &rlim) < 0)
536: fatal("setrlimit failed: %.100s", strerror(errno));
1.1 deraadt 537: }
1.107 markus 538: /* Get user data. */
539: pw = getpwuid(original_real_uid);
540: if (!pw) {
1.380 djm 541: logit("No user exists for uid %lu", (u_long)original_real_uid);
1.257 dtucker 542: exit(255);
1.107 markus 543: }
544: /* Take a copy of the returned structure. */
545: pw = pwcopy(pw);
1.31 markus 546:
1.33 markus 547: /*
548: * Set our umask to something reasonable, as some files are created
549: * with the default umask. This will make them world-readable but
550: * writable only by the owner, which is ok for all files for which we
551: * don't set the modes explicitly.
552: */
1.31 markus 553: umask(022);
554:
1.316 djm 555: /*
556: * Initialize option structure to indicate that no values have been
557: * set.
558: */
1.31 markus 559: initialize_options(&options);
560:
561: /* Parse command-line arguments. */
562: host = NULL;
1.320 djm 563: use_syslog = 0;
1.375 dtucker 564: logfile = NULL;
1.325 markus 565: argv0 = av[0];
1.31 markus 566:
1.266 djm 567: again:
1.316 djm 568: while ((opt = getopt(ac, av, "1246ab:c:e:fgi:kl:m:no:p:qstvx"
1.408 djm 569: "ACD:E:F:GI:KL:MNO:PQ:R:S:TVw:W:XYy")) != -1) {
1.31 markus 570: switch (opt) {
1.91 jakob 571: case '1':
572: options.protocol = SSH_PROTO_1;
573: break;
1.47 markus 574: case '2':
575: options.protocol = SSH_PROTO_2;
576: break;
1.37 markus 577: case '4':
1.196 djm 578: options.address_family = AF_INET;
1.37 markus 579: break;
580: case '6':
1.196 djm 581: options.address_family = AF_INET6;
1.37 markus 582: break;
1.31 markus 583: case 'n':
584: stdin_null_flag = 1;
585: break;
586: case 'f':
587: fork_after_authentication_flag = 1;
588: stdin_null_flag = 1;
589: break;
590: case 'x':
591: options.forward_x11 = 0;
592: break;
593: case 'X':
594: options.forward_x11 = 1;
595: break;
1.320 djm 596: case 'y':
597: use_syslog = 1;
598: break;
1.375 dtucker 599: case 'E':
1.422 ! dtucker 600: logfile = optarg;
1.375 dtucker 601: break;
1.408 djm 602: case 'G':
603: config_test = 1;
604: break;
1.202 markus 605: case 'Y':
606: options.forward_x11 = 1;
607: options.forward_x11_trusted = 1;
608: break;
1.31 markus 609: case 'g':
1.406 millert 610: options.fwd_opts.gateway_ports = 1;
1.31 markus 611: break;
1.229 djm 612: case 'O':
1.332 djm 613: if (stdio_forward_host != NULL)
614: fatal("Cannot specify multiplexing "
615: "command with -W");
616: else if (muxclient_command != 0)
617: fatal("Multiplexing command already specified");
1.229 djm 618: if (strcmp(optarg, "check") == 0)
1.312 djm 619: muxclient_command = SSHMUX_COMMAND_ALIVE_CHECK;
1.338 markus 620: else if (strcmp(optarg, "forward") == 0)
621: muxclient_command = SSHMUX_COMMAND_FORWARD;
1.229 djm 622: else if (strcmp(optarg, "exit") == 0)
1.312 djm 623: muxclient_command = SSHMUX_COMMAND_TERMINATE;
1.357 djm 624: else if (strcmp(optarg, "stop") == 0)
625: muxclient_command = SSHMUX_COMMAND_STOP;
1.365 djm 626: else if (strcmp(optarg, "cancel") == 0)
627: muxclient_command = SSHMUX_COMMAND_CANCEL_FWD;
1.229 djm 628: else
629: fatal("Invalid multiplex command.");
630: break;
1.183 stevesk 631: case 'P': /* deprecated */
1.31 markus 632: options.use_privileged_port = 0;
1.376 djm 633: break;
1.394 deraadt 634: case 'Q':
1.376 djm 635: cp = NULL;
1.394 deraadt 636: if (strcmp(optarg, "cipher") == 0)
1.393 djm 637: cp = cipher_alg_list('\n', 0);
1.394 deraadt 638: else if (strcmp(optarg, "cipher-auth") == 0)
1.393 djm 639: cp = cipher_alg_list('\n', 1);
1.394 deraadt 640: else if (strcmp(optarg, "mac") == 0)
1.392 dtucker 641: cp = mac_alg_list('\n');
1.394 deraadt 642: else if (strcmp(optarg, "kex") == 0)
1.392 dtucker 643: cp = kex_alg_list('\n');
1.394 deraadt 644: else if (strcmp(optarg, "key") == 0)
1.396 markus 645: cp = key_alg_list(0, 0);
646: else if (strcmp(optarg, "key-cert") == 0)
647: cp = key_alg_list(1, 0);
648: else if (strcmp(optarg, "key-plain") == 0)
649: cp = key_alg_list(0, 1);
1.416 djm 650: else if (strcmp(optarg, "protocol-version") == 0) {
651: #ifdef WITH_SSH1
652: cp = xstrdup("1\n2");
653: #else
654: cp = xstrdup("2");
655: #endif
656: }
1.376 djm 657: if (cp == NULL)
658: fatal("Unsupported query \"%s\"", optarg);
659: printf("%s\n", cp);
660: free(cp);
661: exit(0);
1.31 markus 662: break;
663: case 'a':
664: options.forward_agent = 0;
1.53 markus 665: break;
666: case 'A':
667: options.forward_agent = 1;
1.31 markus 668: break;
669: case 'k':
1.204 dtucker 670: options.gss_deleg_creds = 0;
1.297 djm 671: break;
672: case 'K':
673: options.gss_authentication = 1;
674: options.gss_deleg_creds = 1;
1.31 markus 675: break;
676: case 'i':
677: if (stat(optarg, &st) < 0) {
1.128 fgsch 678: fprintf(stderr, "Warning: Identity file %s "
1.231 otto 679: "not accessible: %s.\n", optarg,
680: strerror(errno));
1.31 markus 681: break;
682: }
1.371 dtucker 683: add_identity_file(&options, NULL, optarg, 1);
1.31 markus 684: break;
1.127 markus 685: case 'I':
1.333 markus 686: #ifdef ENABLE_PKCS11
1.422 ! dtucker 687: free(options.pkcs11_provider);
1.333 markus 688: options.pkcs11_provider = xstrdup(optarg);
1.137 jakob 689: #else
1.333 markus 690: fprintf(stderr, "no support for PKCS#11.\n");
1.137 jakob 691: #endif
1.127 markus 692: break;
1.31 markus 693: case 't':
1.359 djm 694: if (options.request_tty == REQUEST_TTY_YES)
695: options.request_tty = REQUEST_TTY_FORCE;
696: else
697: options.request_tty = REQUEST_TTY_YES;
1.31 markus 698: break;
699: case 'v':
1.197 markus 700: if (debug_flag == 0) {
1.66 markus 701: debug_flag = 1;
702: options.log_level = SYSLOG_LEVEL_DEBUG1;
1.197 markus 703: } else {
704: if (options.log_level < SYSLOG_LEVEL_DEBUG3)
705: options.log_level++;
706: }
1.375 dtucker 707: break;
1.31 markus 708: case 'V':
1.209 markus 709: fprintf(stderr, "%s, %s\n",
1.402 markus 710: SSH_VERSION,
711: #ifdef WITH_OPENSSL
712: SSLeay_version(SSLEAY_VERSION)
713: #else
714: "without OpenSSL"
715: #endif
716: );
1.31 markus 717: if (opt == 'V')
718: exit(0);
719: break;
1.255 reyk 720: case 'w':
1.256 reyk 721: if (options.tun_open == -1)
722: options.tun_open = SSH_TUNMODE_DEFAULT;
1.255 reyk 723: options.tun_local = a2tun(optarg, &options.tun_remote);
1.256 reyk 724: if (options.tun_local == SSH_TUNID_ERR) {
1.316 djm 725: fprintf(stderr,
726: "Bad tun device '%s'\n", optarg);
1.257 dtucker 727: exit(255);
1.255 reyk 728: }
729: break;
1.331 dtucker 730: case 'W':
1.332 djm 731: if (stdio_forward_host != NULL)
732: fatal("stdio forward already specified");
733: if (muxclient_command != 0)
734: fatal("Cannot specify stdio forward with -O");
1.331 dtucker 735: if (parse_forward(&fwd, optarg, 1, 0)) {
736: stdio_forward_host = fwd.listen_host;
737: stdio_forward_port = fwd.listen_port;
1.378 djm 738: free(fwd.connect_host);
1.331 dtucker 739: } else {
740: fprintf(stderr,
741: "Bad stdio forwarding specification '%s'\n",
742: optarg);
743: exit(255);
744: }
1.359 djm 745: options.request_tty = REQUEST_TTY_NO;
1.331 dtucker 746: no_shell_flag = 1;
747: options.clear_forwardings = 1;
748: options.exit_on_forward_failure = 1;
749: break;
1.31 markus 750: case 'q':
751: options.log_level = SYSLOG_LEVEL_QUIET;
752: break;
753: case 'e':
754: if (optarg[0] == '^' && optarg[2] == 0 &&
1.128 fgsch 755: (u_char) optarg[1] >= 64 &&
756: (u_char) optarg[1] < 128)
1.78 markus 757: options.escape_char = (u_char) optarg[1] & 31;
1.31 markus 758: else if (strlen(optarg) == 1)
1.78 markus 759: options.escape_char = (u_char) optarg[0];
1.31 markus 760: else if (strcmp(optarg, "none") == 0)
1.119 stevesk 761: options.escape_char = SSH_ESCAPECHAR_NONE;
1.31 markus 762: else {
1.128 fgsch 763: fprintf(stderr, "Bad escape character '%s'.\n",
764: optarg);
1.257 dtucker 765: exit(255);
1.31 markus 766: }
767: break;
768: case 'c':
1.420 djm 769: if (ciphers_valid(*optarg == '+' ?
770: optarg + 1 : optarg)) {
1.49 markus 771: /* SSH2 only */
1.422 ! dtucker 772: free(options.ciphers);
1.49 markus 773: options.ciphers = xstrdup(optarg);
1.224 markus 774: options.cipher = SSH_CIPHER_INVALID;
1.420 djm 775: break;
776: }
777: /* SSH1 only */
778: options.cipher = cipher_number(optarg);
779: if (options.cipher == -1) {
780: fprintf(stderr, "Unknown cipher type '%s'\n",
781: optarg);
782: exit(255);
1.95 markus 783: }
1.420 djm 784: if (options.cipher == SSH_CIPHER_3DES)
785: options.ciphers = xstrdup("3des-cbc");
786: else if (options.cipher == SSH_CIPHER_BLOWFISH)
787: options.ciphers = xstrdup("blowfish-cbc");
788: else
789: options.ciphers = xstrdup(KEX_CLIENT_ENCRYPT);
1.95 markus 790: break;
791: case 'm':
1.422 ! dtucker 792: if (mac_valid(optarg)) {
! 793: free(options.macs);
1.95 markus 794: options.macs = xstrdup(optarg);
1.422 ! dtucker 795: } else {
1.128 fgsch 796: fprintf(stderr, "Unknown mac type '%s'\n",
797: optarg);
1.257 dtucker 798: exit(255);
1.31 markus 799: }
800: break;
1.214 djm 801: case 'M':
1.242 djm 802: if (options.control_master == SSHCTL_MASTER_YES)
803: options.control_master = SSHCTL_MASTER_ASK;
804: else
805: options.control_master = SSHCTL_MASTER_YES;
1.214 djm 806: break;
1.31 markus 807: case 'p':
1.113 stevesk 808: options.port = a2port(optarg);
1.323 djm 809: if (options.port <= 0) {
1.109 markus 810: fprintf(stderr, "Bad port '%s'\n", optarg);
1.257 dtucker 811: exit(255);
1.109 markus 812: }
1.31 markus 813: break;
814: case 'l':
815: options.user = optarg;
816: break;
1.141 stevesk 817:
818: case 'L':
1.324 djm 819: if (parse_forward(&fwd, optarg, 0, 0))
1.232 djm 820: add_local_forward(&options, &fwd);
821: else {
1.128 fgsch 822: fprintf(stderr,
1.232 djm 823: "Bad local forwarding specification '%s'\n",
1.128 fgsch 824: optarg);
1.257 dtucker 825: exit(255);
1.31 markus 826: }
1.232 djm 827: break;
828:
829: case 'R':
1.324 djm 830: if (parse_forward(&fwd, optarg, 0, 1)) {
1.232 djm 831: add_remote_forward(&options, &fwd);
832: } else {
1.128 fgsch 833: fprintf(stderr,
1.232 djm 834: "Bad remote forwarding specification "
835: "'%s'\n", optarg);
1.257 dtucker 836: exit(255);
1.31 markus 837: }
838: break;
1.108 markus 839:
840: case 'D':
1.324 djm 841: if (parse_forward(&fwd, optarg, 1, 0)) {
1.322 stevesk 842: add_local_forward(&options, &fwd);
1.232 djm 843: } else {
1.322 stevesk 844: fprintf(stderr,
845: "Bad dynamic forwarding specification "
846: "'%s'\n", optarg);
1.257 dtucker 847: exit(255);
1.109 markus 848: }
1.108 markus 849: break;
850:
1.31 markus 851: case 'C':
852: options.compression = 1;
853: break;
1.45 markus 854: case 'N':
855: no_shell_flag = 1;
1.359 djm 856: options.request_tty = REQUEST_TTY_NO;
1.45 markus 857: break;
858: case 'T':
1.359 djm 859: options.request_tty = REQUEST_TTY_NO;
1.45 markus 860: break;
1.31 markus 861: case 'o':
1.205 markus 862: line = xstrdup(optarg);
1.408 djm 863: if (process_config_line(&options, pw,
864: host ? host : "", host ? host : "", line,
865: "command-line", 0, NULL, SSHCONF_USERCONF) != 0)
1.257 dtucker 866: exit(255);
1.378 djm 867: free(line);
1.31 markus 868: break;
1.85 djm 869: case 's':
870: subsystem_flag = 1;
1.117 markus 871: break;
1.214 djm 872: case 'S':
873: if (options.control_path != NULL)
874: free(options.control_path);
875: options.control_path = xstrdup(optarg);
876: break;
1.117 markus 877: case 'b':
878: options.bind_address = optarg;
1.85 djm 879: break;
1.139 markus 880: case 'F':
881: config = optarg;
882: break;
1.31 markus 883: default:
884: usage();
1.1 deraadt 885: }
1.31 markus 886: }
887:
1.128 fgsch 888: ac -= optind;
889: av += optind;
890:
1.329 guenther 891: if (ac > 0 && !host) {
1.188 markus 892: if (strrchr(*av, '@')) {
1.128 fgsch 893: p = xstrdup(*av);
1.188 markus 894: cp = strrchr(p, '@');
1.128 fgsch 895: if (cp == NULL || cp == p)
896: usage();
897: options.user = p;
898: *cp = '\0';
1.385 djm 899: host = xstrdup(++cp);
1.128 fgsch 900: } else
1.385 djm 901: host = xstrdup(*av);
1.189 millert 902: if (ac > 1) {
903: optind = optreset = 1;
1.128 fgsch 904: goto again;
905: }
1.189 millert 906: ac--, av++;
1.128 fgsch 907: }
908:
1.31 markus 909: /* Check that we got a host name. */
910: if (!host)
911: usage();
912:
1.385 djm 913: host_arg = xstrdup(host);
914:
1.402 markus 915: #ifdef WITH_OPENSSL
1.350 djm 916: OpenSSL_add_all_algorithms();
1.72 markus 917: ERR_load_crypto_strings();
1.402 markus 918: #endif
1.31 markus 919:
920: /* Initialize the command to execute on remote host. */
921: buffer_init(&command);
1.1 deraadt 922:
1.33 markus 923: /*
924: * Save the command to execute on the remote host in a buffer. There
925: * is no limit on the length of the command, except by the maximum
926: * packet size. Also sets the tty flag if there is no command.
927: */
1.128 fgsch 928: if (!ac) {
1.31 markus 929: /* No command specified - execute shell on a tty. */
1.85 djm 930: if (subsystem_flag) {
1.128 fgsch 931: fprintf(stderr,
932: "You must specify a subsystem to invoke.\n");
1.85 djm 933: usage();
934: }
1.31 markus 935: } else {
1.128 fgsch 936: /* A command has been specified. Store it into the buffer. */
937: for (i = 0; i < ac; i++) {
938: if (i)
1.31 markus 939: buffer_append(&command, " ", 1);
940: buffer_append(&command, av[i], strlen(av[i]));
941: }
942: }
943:
944: /* Cannot fork to background if no command. */
1.316 djm 945: if (fork_after_authentication_flag && buffer_len(&command) == 0 &&
946: !no_shell_flag)
947: fatal("Cannot fork into background without a command "
948: "to execute.");
1.31 markus 949:
1.101 markus 950: /*
951: * Initialize "log" output. Since we are the client all output
1.375 dtucker 952: * goes to stderr unless otherwise specified by -y or -E.
1.101 markus 953: */
1.375 dtucker 954: if (use_syslog && logfile != NULL)
955: fatal("Can't specify both -y and -E");
1.422 ! dtucker 956: if (logfile != NULL)
1.375 dtucker 957: log_redirect_stderr_to(logfile);
1.325 markus 958: log_init(argv0,
1.316 djm 959: options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level,
1.320 djm 960: SYSLOG_FACILITY_USER, !use_syslog);
1.375 dtucker 961:
962: if (debug_flag)
1.402 markus 963: logit("%s, %s", SSH_VERSION,
964: #ifdef WITH_OPENSSL
965: SSLeay_version(SSLEAY_VERSION)
966: #else
967: "without OpenSSL"
968: #endif
969: );
1.31 markus 970:
1.400 djm 971: /* Parse the configuration files */
1.408 djm 972: process_config_files(host_arg, pw, 0);
1.400 djm 973:
974: /* Hostname canonicalisation needs a few options filled. */
975: fill_default_options_for_canonicalization(&options);
976:
977: /* If the user has replaced the hostname then take it into use now */
978: if (options.hostname != NULL) {
979: /* NB. Please keep in sync with readconf.c:match_cfg_line() */
980: cp = percent_expand(options.hostname,
981: "h", host, (char *)NULL);
982: free(host);
983: host = cp;
1.408 djm 984: free(options.hostname);
985: options.hostname = xstrdup(host);
1.400 djm 986: }
987:
988: /* If canonicalization requested then try to apply it */
989: lowercase(host);
990: if (options.canonicalize_hostname != SSH_CANONICALISE_NO)
991: addrs = resolve_canonicalize(&host, options.port);
992:
1.139 markus 993: /*
1.401 djm 994: * If CanonicalizePermittedCNAMEs have been specified but
995: * other canonicalization did not happen (by not being requested
996: * or by failing with fallback) then the hostname may still be changed
997: * as a result of CNAME following.
998: *
999: * Try to resolve the bare hostname name using the system resolver's
1000: * usual search rules and then apply the CNAME follow rules.
1001: *
1002: * Skip the lookup if a ProxyCommand is being used unless the user
1003: * has specifically requested canonicalisation for this case via
1004: * CanonicalizeHostname=always
1.139 markus 1005: */
1.401 djm 1006: if (addrs == NULL && options.num_permitted_cnames != 0 &&
1007: (option_clear_or_none(options.proxy_command) ||
1.400 djm 1008: options.canonicalize_hostname == SSH_CANONICALISE_ALWAYS)) {
1.403 djm 1009: if ((addrs = resolve_host(host, options.port,
1010: option_clear_or_none(options.proxy_command),
1011: cname, sizeof(cname))) == NULL) {
1012: /* Don't fatal proxied host names not in the DNS */
1013: if (option_clear_or_none(options.proxy_command))
1014: cleanup_exit(255); /* logged in resolve_host */
1015: } else
1016: check_follow_cname(&host, cname);
1.400 djm 1017: }
1.139 markus 1018:
1.400 djm 1019: /*
1.408 djm 1020: * If canonicalisation is enabled then re-parse the configuration
1021: * files as new stanzas may match.
1.400 djm 1022: */
1.408 djm 1023: if (options.canonicalize_hostname != 0) {
1024: debug("Re-reading configuration after hostname "
1025: "canonicalisation");
1026: free(options.hostname);
1027: options.hostname = xstrdup(host);
1028: process_config_files(host_arg, pw, 1);
1029: /*
1030: * Address resolution happens early with canonicalisation
1031: * enabled and the port number may have changed since, so
1032: * reset it in address list
1033: */
1034: if (addrs != NULL && options.port > 0)
1035: set_addrinfo_port(addrs, options.port);
1.139 markus 1036: }
1.31 markus 1037:
1038: /* Fill configuration defaults. */
1039: fill_default_options(&options);
1040:
1.400 djm 1041: if (options.port == 0)
1042: options.port = default_ssh_port();
1.196 djm 1043: channel_set_af(options.address_family);
1044:
1.383 djm 1045: /* Tidy and check options */
1046: if (options.host_key_alias != NULL)
1047: lowercase(options.host_key_alias);
1048: if (options.proxy_command != NULL &&
1049: strcmp(options.proxy_command, "-") == 0 &&
1050: options.proxy_use_fdpass)
1051: fatal("ProxyCommand=- and ProxyUseFDPass are incompatible");
1.415 djm 1052: if (options.control_persist &&
1053: options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK) {
1054: debug("UpdateHostKeys=ask is incompatible with ControlPersist; "
1055: "disabling");
1056: options.update_hostkeys = 0;
1057: }
1.388 djm 1058: if (original_effective_uid != 0)
1059: options.use_privileged_port = 0;
1.383 djm 1060:
1.31 markus 1061: /* reinit */
1.325 markus 1062: log_init(argv0, options.log_level, SYSLOG_FACILITY_USER, !use_syslog);
1.370 djm 1063:
1064: if (options.request_tty == REQUEST_TTY_YES ||
1065: options.request_tty == REQUEST_TTY_FORCE)
1066: tty_flag = 1;
1067:
1068: /* Allocate a tty by default if no command specified. */
1069: if (buffer_len(&command) == 0)
1070: tty_flag = options.request_tty != REQUEST_TTY_NO;
1071:
1072: /* Force no tty */
1073: if (options.request_tty == REQUEST_TTY_NO || muxclient_command != 0)
1074: tty_flag = 0;
1075: /* Do not allocate a tty if stdin is not a tty. */
1076: if ((!isatty(fileno(stdin)) || stdin_null_flag) &&
1077: options.request_tty != REQUEST_TTY_FORCE) {
1078: if (tty_flag)
1079: logit("Pseudo-terminal will not be allocated because "
1080: "stdin is not a terminal.");
1081: tty_flag = 0;
1082: }
1.31 markus 1083:
1084: if (options.user == NULL)
1085: options.user = xstrdup(pw->pw_name);
1.343 djm 1086:
1.358 djm 1087: if (gethostname(thishost, sizeof(thishost)) == -1)
1088: fatal("gethostname: %s", strerror(errno));
1089: strlcpy(shorthost, thishost, sizeof(shorthost));
1090: shorthost[strcspn(thishost, ".")] = '\0';
1091: snprintf(portstr, sizeof(portstr), "%d", options.port);
1092:
1.405 djm 1093: if ((md = ssh_digest_start(SSH_DIGEST_SHA1)) == NULL ||
1094: ssh_digest_update(md, thishost, strlen(thishost)) < 0 ||
1095: ssh_digest_update(md, host, strlen(host)) < 0 ||
1096: ssh_digest_update(md, portstr, strlen(portstr)) < 0 ||
1097: ssh_digest_update(md, options.user, strlen(options.user)) < 0 ||
1098: ssh_digest_final(md, conn_hash, sizeof(conn_hash)) < 0)
1099: fatal("%s: mux digest failed", __func__);
1100: ssh_digest_free(md);
1101: conn_hash_hex = tohex(conn_hash, ssh_digest_bytes(SSH_DIGEST_SHA1));
1102:
1.317 dtucker 1103: if (options.local_command != NULL) {
1104: debug3("expanding LocalCommand: %s", options.local_command);
1105: cp = options.local_command;
1.405 djm 1106: options.local_command = percent_expand(cp,
1107: "C", conn_hash_hex,
1108: "L", shorthost,
1109: "d", pw->pw_dir,
1110: "h", host,
1111: "l", thishost,
1112: "n", host_arg,
1113: "p", portstr,
1114: "r", options.user,
1115: "u", pw->pw_name,
1.358 djm 1116: (char *)NULL);
1.317 dtucker 1117: debug3("expanded LocalCommand: %s", options.local_command);
1.378 djm 1118: free(cp);
1.304 dtucker 1119: }
1.31 markus 1120:
1.214 djm 1121: if (options.control_path != NULL) {
1.241 djm 1122: cp = tilde_expand_filename(options.control_path,
1123: original_real_uid);
1.378 djm 1124: free(options.control_path);
1.405 djm 1125: options.control_path = percent_expand(cp,
1126: "C", conn_hash_hex,
1127: "L", shorthost,
1128: "h", host,
1129: "l", thishost,
1130: "n", host_arg,
1131: "p", portstr,
1132: "r", options.user,
1133: "u", pw->pw_name,
1.358 djm 1134: (char *)NULL);
1.378 djm 1135: free(cp);
1.214 djm 1136: }
1.405 djm 1137: free(conn_hash_hex);
1.408 djm 1138:
1139: if (config_test) {
1140: dump_client_config(&options, host);
1141: exit(0);
1142: }
1.405 djm 1143:
1.312 djm 1144: if (muxclient_command != 0 && options.control_path == NULL)
1.240 djm 1145: fatal("No ControlPath specified for \"-O\" command");
1.242 djm 1146: if (options.control_path != NULL)
1.312 djm 1147: muxclient(options.control_path);
1.401 djm 1148:
1149: /*
1150: * If hostname canonicalisation was not enabled, then we may not
1151: * have yet resolved the hostname. Do so now.
1152: */
1153: if (addrs == NULL && options.proxy_command == NULL) {
1.421 djm 1154: debug2("resolving \"%s\" port %d", host, options.port);
1.401 djm 1155: if ((addrs = resolve_host(host, options.port, 1,
1156: cname, sizeof(cname))) == NULL)
1157: cleanup_exit(255); /* resolve_host logs the error */
1158: }
1.214 djm 1159:
1.303 djm 1160: timeout_ms = options.connection_timeout * 1000;
1161:
1.77 markus 1162: /* Open a connection to the remote host. */
1.385 djm 1163: if (ssh_connect(host, addrs, &hostaddr, options.port,
1164: options.address_family, options.connection_attempts,
1165: &timeout_ms, options.tcp_keep_alive,
1.388 djm 1166: options.use_privileged_port) != 0)
1.257 dtucker 1167: exit(255);
1.31 markus 1168:
1.391 djm 1169: if (addrs != NULL)
1170: freeaddrinfo(addrs);
1171:
1.385 djm 1172: packet_set_timeout(options.server_alive_interval,
1173: options.server_alive_count_max);
1174:
1.303 djm 1175: if (timeout_ms > 0)
1176: debug3("timeout: %d ms remain after connect", timeout_ms);
1177:
1.33 markus 1178: /*
1179: * If we successfully made the connection, load the host private key
1180: * in case we will need it later for combined rsa-rhosts
1181: * authentication. This must be done before releasing extra
1182: * privileges, because the file is only readable by root.
1.174 markus 1183: * If we cannot access the private keys, load the public keys
1184: * instead and try to execute the ssh-keysign helper instead.
1.33 markus 1185: */
1.112 markus 1186: sensitive_data.nkeys = 0;
1187: sensitive_data.keys = NULL;
1.173 markus 1188: sensitive_data.external_keysign = 0;
1.178 markus 1189: if (options.rhosts_rsa_authentication ||
1190: options.hostbased_authentication) {
1.397 djm 1191: sensitive_data.nkeys = 9;
1.274 deraadt 1192: sensitive_data.keys = xcalloc(sensitive_data.nkeys,
1.180 deraadt 1193: sizeof(Key));
1.177 markus 1194:
1195: PRIV_START;
1.112 markus 1196: sensitive_data.keys[0] = key_load_private_type(KEY_RSA1,
1.276 dtucker 1197: _PATH_HOST_KEY_FILE, "", NULL, NULL);
1.411 djm 1198: sensitive_data.keys[1] = key_load_private_cert(KEY_ECDSA,
1.349 djm 1199: _PATH_HOST_ECDSA_KEY_FILE, "", NULL);
1.411 djm 1200: sensitive_data.keys[2] = key_load_private_cert(KEY_ED25519,
1201: _PATH_HOST_ED25519_KEY_FILE, "", NULL);
1.349 djm 1202: sensitive_data.keys[3] = key_load_private_cert(KEY_RSA,
1.345 djm 1203: _PATH_HOST_RSA_KEY_FILE, "", NULL);
1.411 djm 1204: sensitive_data.keys[4] = key_load_private_cert(KEY_DSA,
1205: _PATH_HOST_DSA_KEY_FILE, "", NULL);
1206: sensitive_data.keys[5] = key_load_private_type(KEY_ECDSA,
1.349 djm 1207: _PATH_HOST_ECDSA_KEY_FILE, "", NULL, NULL);
1.411 djm 1208: sensitive_data.keys[6] = key_load_private_type(KEY_ED25519,
1209: _PATH_HOST_ED25519_KEY_FILE, "", NULL, NULL);
1.397 djm 1210: sensitive_data.keys[7] = key_load_private_type(KEY_RSA,
1.276 dtucker 1211: _PATH_HOST_RSA_KEY_FILE, "", NULL, NULL);
1.411 djm 1212: sensitive_data.keys[8] = key_load_private_type(KEY_DSA,
1213: _PATH_HOST_DSA_KEY_FILE, "", NULL, NULL);
1.177 markus 1214: PRIV_END;
1.173 markus 1215:
1.181 markus 1216: if (options.hostbased_authentication == 1 &&
1217: sensitive_data.keys[0] == NULL &&
1.349 djm 1218: sensitive_data.keys[5] == NULL &&
1.396 markus 1219: sensitive_data.keys[6] == NULL &&
1.397 djm 1220: sensitive_data.keys[7] == NULL &&
1221: sensitive_data.keys[8] == NULL) {
1.345 djm 1222: sensitive_data.keys[1] = key_load_cert(
1.411 djm 1223: _PATH_HOST_ECDSA_KEY_FILE);
1.345 djm 1224: sensitive_data.keys[2] = key_load_cert(
1.411 djm 1225: _PATH_HOST_ED25519_KEY_FILE);
1.349 djm 1226: sensitive_data.keys[3] = key_load_cert(
1.345 djm 1227: _PATH_HOST_RSA_KEY_FILE);
1.397 djm 1228: sensitive_data.keys[4] = key_load_cert(
1.411 djm 1229: _PATH_HOST_DSA_KEY_FILE);
1.397 djm 1230: sensitive_data.keys[5] = key_load_public(
1.411 djm 1231: _PATH_HOST_ECDSA_KEY_FILE, NULL);
1.397 djm 1232: sensitive_data.keys[6] = key_load_public(
1.411 djm 1233: _PATH_HOST_ED25519_KEY_FILE, NULL);
1.397 djm 1234: sensitive_data.keys[7] = key_load_public(
1.173 markus 1235: _PATH_HOST_RSA_KEY_FILE, NULL);
1.397 djm 1236: sensitive_data.keys[8] = key_load_public(
1.411 djm 1237: _PATH_HOST_DSA_KEY_FILE, NULL);
1.173 markus 1238: sensitive_data.external_keysign = 1;
1239: }
1.31 markus 1240: }
1.33 markus 1241: /*
1242: * Get rid of any extra privileges that we may have. We will no
1243: * longer need them. Also, extra privileges could make it very hard
1244: * to read identity files and other non-world-readable files from the
1245: * user's home directory if it happens to be on a NFS volume where
1246: * root is mapped to nobody.
1247: */
1.225 dtucker 1248: if (original_effective_uid == 0) {
1249: PRIV_START;
1250: permanently_set_uid(pw);
1251: }
1.31 markus 1252:
1.33 markus 1253: /*
1254: * Now that we are back to our own permissions, create ~/.ssh
1.254 djm 1255: * directory if it doesn't already exist.
1.33 markus 1256: */
1.367 djm 1257: if (config == NULL) {
1258: r = snprintf(buf, sizeof buf, "%s%s%s", pw->pw_dir,
1259: strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR);
1260: if (r > 0 && (size_t)r < sizeof(buf) && stat(buf, &st) < 0)
1261: if (mkdir(buf, 0700) < 0)
1262: error("Could not create directory '%.200s'.",
1263: buf);
1264: }
1.31 markus 1265:
1.104 markus 1266: /* load options.identity_files */
1267: load_public_identity_files();
1268:
1269: /* Expand ~ in known host file names. */
1.361 djm 1270: tilde_expand_paths(options.system_hostfiles,
1271: options.num_system_hostfiles);
1272: tilde_expand_paths(options.user_hostfiles, options.num_user_hostfiles);
1.149 markus 1273:
1274: signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
1.352 djm 1275: signal(SIGCHLD, main_sigchld_handler);
1.31 markus 1276:
1.316 djm 1277: /* Log into the remote system. Never returns if the login fails. */
1.303 djm 1278: ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr,
1.355 djm 1279: options.port, pw, timeout_ms);
1.339 djm 1280:
1281: if (packet_connection_is_on_socket()) {
1282: verbose("Authenticated to %s ([%s]:%d).", host,
1283: get_remote_ipaddr(), get_remote_port());
1284: } else {
1285: verbose("Authenticated to %s (via proxy).", host);
1286: }
1.31 markus 1287:
1.112 markus 1288: /* We no longer need the private host keys. Clear them now. */
1289: if (sensitive_data.nkeys != 0) {
1290: for (i = 0; i < sensitive_data.nkeys; i++) {
1291: if (sensitive_data.keys[i] != NULL) {
1292: /* Destroys contents safely */
1293: debug3("clear hostkey %d", i);
1294: key_free(sensitive_data.keys[i]);
1295: sensitive_data.keys[i] = NULL;
1296: }
1297: }
1.378 djm 1298: free(sensitive_data.keys);
1.134 markus 1299: }
1300: for (i = 0; i < options.num_identity_files; i++) {
1.378 djm 1301: free(options.identity_files[i]);
1302: options.identity_files[i] = NULL;
1.134 markus 1303: if (options.identity_keys[i]) {
1304: key_free(options.identity_keys[i]);
1305: options.identity_keys[i] = NULL;
1306: }
1.112 markus 1307: }
1.31 markus 1308:
1.45 markus 1309: exit_status = compat20 ? ssh_session2() : ssh_session();
1310: packet_close();
1.186 djm 1311:
1.312 djm 1312: if (options.control_path != NULL && muxserver_sock != -1)
1.214 djm 1313: unlink(options.control_path);
1314:
1.353 djm 1315: /* Kill ProxyCommand if it is running. */
1316: ssh_kill_proxy_command();
1.186 djm 1317:
1.45 markus 1318: return exit_status;
1319: }
1320:
1.344 djm 1321: static void
1322: control_persist_detach(void)
1323: {
1324: pid_t pid;
1.346 djm 1325: int devnull;
1.344 djm 1326:
1327: debug("%s: backgrounding master process", __func__);
1328:
1329: /*
1330: * master (current process) into the background, and make the
1331: * foreground process a client of the backgrounded master.
1332: */
1333: switch ((pid = fork())) {
1334: case -1:
1335: fatal("%s: fork: %s", __func__, strerror(errno));
1336: case 0:
1337: /* Child: master process continues mainloop */
1338: break;
1339: default:
1340: /* Parent: set up mux slave to connect to backgrounded master */
1341: debug2("%s: background process is %ld", __func__, (long)pid);
1342: stdin_null_flag = ostdin_null_flag;
1.359 djm 1343: options.request_tty = orequest_tty;
1.344 djm 1344: tty_flag = otty_flag;
1345: close(muxserver_sock);
1346: muxserver_sock = -1;
1.351 markus 1347: options.control_master = SSHCTL_MASTER_NO;
1.344 djm 1348: muxclient(options.control_path);
1349: /* muxclient() doesn't return on success. */
1350: fatal("Failed to connect to new control master");
1351: }
1.346 djm 1352: if ((devnull = open(_PATH_DEVNULL, O_RDWR)) == -1) {
1353: error("%s: open(\"/dev/null\"): %s", __func__,
1354: strerror(errno));
1355: } else {
1356: if (dup2(devnull, STDIN_FILENO) == -1 ||
1357: dup2(devnull, STDOUT_FILENO) == -1)
1358: error("%s: dup2: %s", __func__, strerror(errno));
1359: if (devnull > STDERR_FILENO)
1360: close(devnull);
1361: }
1.381 djm 1362: daemon(1, 1);
1.362 djm 1363: setproctitle("%s [mux]", options.control_path);
1.344 djm 1364: }
1365:
1366: /* Do fork() after authentication. Used by "ssh -f" */
1367: static void
1368: fork_postauth(void)
1369: {
1370: if (need_controlpersist_detach)
1371: control_persist_detach();
1372: debug("forking to background");
1373: fork_after_authentication_flag = 0;
1374: if (daemon(1, 1) < 0)
1375: fatal("daemon() failed: %.200s", strerror(errno));
1376: }
1377:
1.315 djm 1378: /* Callback for remote forward global requests */
1379: static void
1380: ssh_confirm_remote_forward(int type, u_int32_t seq, void *ctxt)
1381: {
1.406 millert 1382: struct Forward *rfwd = (struct Forward *)ctxt;
1.315 djm 1383:
1.324 djm 1384: /* XXX verbose() on failure? */
1.404 markus 1385: debug("remote forward %s for: listen %s%s%d, connect %s:%d",
1.315 djm 1386: type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
1.406 millert 1387: rfwd->listen_path ? rfwd->listen_path :
1388: rfwd->listen_host ? rfwd->listen_host : "",
1389: (rfwd->listen_path || rfwd->listen_host) ? ":" : "",
1390: rfwd->listen_port, rfwd->connect_path ? rfwd->connect_path :
1391: rfwd->connect_host, rfwd->connect_port);
1392: if (rfwd->listen_path == NULL && rfwd->listen_port == 0) {
1.366 markus 1393: if (type == SSH2_MSG_REQUEST_SUCCESS) {
1394: rfwd->allocated_port = packet_get_int();
1395: logit("Allocated port %u for remote forward to %s:%d",
1396: rfwd->allocated_port,
1397: rfwd->connect_host, rfwd->connect_port);
1398: channel_update_permitted_opens(rfwd->handle,
1399: rfwd->allocated_port);
1400: } else {
1401: channel_update_permitted_opens(rfwd->handle, -1);
1402: }
1.324 djm 1403: }
1404:
1.315 djm 1405: if (type == SSH2_MSG_REQUEST_FAILURE) {
1.406 millert 1406: if (options.exit_on_forward_failure) {
1407: if (rfwd->listen_path != NULL)
1408: fatal("Error: remote port forwarding failed "
1409: "for listen path %s", rfwd->listen_path);
1410: else
1411: fatal("Error: remote port forwarding failed "
1412: "for listen port %d", rfwd->listen_port);
1413: } else {
1414: if (rfwd->listen_path != NULL)
1415: logit("Warning: remote port forwarding failed "
1416: "for listen path %s", rfwd->listen_path);
1417: else
1418: logit("Warning: remote port forwarding failed "
1419: "for listen port %d", rfwd->listen_port);
1420: }
1.315 djm 1421: }
1.318 djm 1422: if (++remote_forward_confirms_received == options.num_remote_forwards) {
1.315 djm 1423: debug("All remote forwarding requests processed");
1.344 djm 1424: if (fork_after_authentication_flag)
1425: fork_postauth();
1.318 djm 1426: }
1.315 djm 1427: }
1428:
1.126 itojun 1429: static void
1.331 dtucker 1430: client_cleanup_stdio_fwd(int id, void *arg)
1431: {
1432: debug("stdio forwarding: done");
1433: cleanup_exit(0);
1434: }
1435:
1.368 djm 1436: static void
1.407 djm 1437: ssh_stdio_confirm(int id, int success, void *arg)
1438: {
1439: if (!success)
1440: fatal("stdio forwarding failed");
1441: }
1442:
1443: static void
1.368 djm 1444: ssh_init_stdio_forwarding(void)
1.331 dtucker 1445: {
1446: Channel *c;
1.332 djm 1447: int in, out;
1.331 dtucker 1448:
1.368 djm 1449: if (stdio_forward_host == NULL)
1450: return;
1.384 djm 1451: if (!compat20)
1.368 djm 1452: fatal("stdio forwarding require Protocol 2");
1453:
1454: debug3("%s: %s:%d", __func__, stdio_forward_host, stdio_forward_port);
1.332 djm 1455:
1.368 djm 1456: if ((in = dup(STDIN_FILENO)) < 0 ||
1457: (out = dup(STDOUT_FILENO)) < 0)
1.332 djm 1458: fatal("channel_connect_stdio_fwd: dup() in/out failed");
1.368 djm 1459: if ((c = channel_connect_stdio_fwd(stdio_forward_host,
1460: stdio_forward_port, in, out)) == NULL)
1461: fatal("%s: channel_connect_stdio_fwd failed", __func__);
1.331 dtucker 1462: channel_register_cleanup(c->self, client_cleanup_stdio_fwd, 0);
1.407 djm 1463: channel_register_open_confirm(c->self, ssh_stdio_confirm, NULL);
1.331 dtucker 1464: }
1465:
1466: static void
1.70 markus 1467: ssh_init_forwarding(void)
1468: {
1.86 markus 1469: int success = 0;
1.70 markus 1470: int i;
1.331 dtucker 1471:
1.70 markus 1472: /* Initiate local TCP/IP port forwardings. */
1473: for (i = 0; i < options.num_local_forwards; i++) {
1.232 djm 1474: debug("Local connections to %.200s:%d forwarded to remote "
1475: "address %.200s:%d",
1.406 millert 1476: (options.local_forwards[i].listen_path != NULL) ?
1477: options.local_forwards[i].listen_path :
1.234 deraadt 1478: (options.local_forwards[i].listen_host == NULL) ?
1.406 millert 1479: (options.fwd_opts.gateway_ports ? "*" : "LOCALHOST") :
1.232 djm 1480: options.local_forwards[i].listen_host,
1481: options.local_forwards[i].listen_port,
1.406 millert 1482: (options.local_forwards[i].connect_path != NULL) ?
1483: options.local_forwards[i].connect_path :
1.232 djm 1484: options.local_forwards[i].connect_host,
1485: options.local_forwards[i].connect_port);
1.158 markus 1486: success += channel_setup_local_fwd_listener(
1.406 millert 1487: &options.local_forwards[i], &options.fwd_opts);
1.70 markus 1488: }
1.283 markus 1489: if (i > 0 && success != i && options.exit_on_forward_failure)
1490: fatal("Could not request local forwarding.");
1.86 markus 1491: if (i > 0 && success == 0)
1492: error("Could not request local forwarding.");
1.70 markus 1493:
1494: /* Initiate remote TCP/IP port forwardings. */
1495: for (i = 0; i < options.num_remote_forwards; i++) {
1.232 djm 1496: debug("Remote connections from %.200s:%d forwarded to "
1497: "local address %.200s:%d",
1.406 millert 1498: (options.remote_forwards[i].listen_path != NULL) ?
1499: options.remote_forwards[i].listen_path :
1.248 djm 1500: (options.remote_forwards[i].listen_host == NULL) ?
1.253 djm 1501: "LOCALHOST" : options.remote_forwards[i].listen_host,
1.232 djm 1502: options.remote_forwards[i].listen_port,
1.406 millert 1503: (options.remote_forwards[i].connect_path != NULL) ?
1504: options.remote_forwards[i].connect_path :
1.232 djm 1505: options.remote_forwards[i].connect_host,
1506: options.remote_forwards[i].connect_port);
1.366 markus 1507: options.remote_forwards[i].handle =
1508: channel_request_remote_forwarding(
1.406 millert 1509: &options.remote_forwards[i]);
1.366 markus 1510: if (options.remote_forwards[i].handle < 0) {
1.283 markus 1511: if (options.exit_on_forward_failure)
1512: fatal("Could not request remote forwarding.");
1513: else
1514: logit("Warning: Could not request remote "
1515: "forwarding.");
1.366 markus 1516: } else {
1517: client_register_global_confirm(ssh_confirm_remote_forward,
1518: &options.remote_forwards[i]);
1.283 markus 1519: }
1.70 markus 1520: }
1.301 djm 1521:
1522: /* Initiate tunnel forwarding. */
1523: if (options.tun_open != SSH_TUNMODE_NO) {
1524: if (client_request_tun_fwd(options.tun_open,
1525: options.tun_local, options.tun_remote) == -1) {
1526: if (options.exit_on_forward_failure)
1527: fatal("Could not request tunnel forwarding.");
1528: else
1529: error("Could not request tunnel forwarding.");
1530: }
1531: }
1.70 markus 1532: }
1533:
1.126 itojun 1534: static void
1.70 markus 1535: check_agent_present(void)
1536: {
1.412 djm 1537: int r;
1538:
1.70 markus 1539: if (options.forward_agent) {
1.254 djm 1540: /* Clear agent forwarding if we don't have an agent. */
1.412 djm 1541: if ((r = ssh_get_authentication_socket(NULL)) != 0) {
1.70 markus 1542: options.forward_agent = 0;
1.412 djm 1543: if (r != SSH_ERR_AGENT_NOT_PRESENT)
1544: debug("ssh_get_authentication_socket: %s",
1545: ssh_err(r));
1546: }
1.70 markus 1547: }
1548: }
1549:
1.126 itojun 1550: static int
1.45 markus 1551: ssh_session(void)
1552: {
1553: int type;
1554: int interactive = 0;
1555: int have_tty = 0;
1556: struct winsize ws;
1557: char *cp;
1.243 djm 1558: const char *display;
1.45 markus 1559:
1.31 markus 1560: /* Enable compression if requested. */
1561: if (options.compression) {
1.316 djm 1562: debug("Requesting compression at level %d.",
1563: options.compression_level);
1.31 markus 1564:
1.316 djm 1565: if (options.compression_level < 1 ||
1566: options.compression_level > 9)
1567: fatal("Compression level must be from 1 (fast) to "
1568: "9 (slow, best).");
1.31 markus 1569:
1570: /* Send the request. */
1571: packet_start(SSH_CMSG_REQUEST_COMPRESSION);
1572: packet_put_int(options.compression_level);
1573: packet_send();
1574: packet_write_wait();
1.156 markus 1575: type = packet_read();
1.31 markus 1576: if (type == SSH_SMSG_SUCCESS)
1577: packet_start_compression(options.compression_level);
1578: else if (type == SSH_SMSG_FAILURE)
1.191 itojun 1579: logit("Warning: Remote host refused compression.");
1.31 markus 1580: else
1.316 djm 1581: packet_disconnect("Protocol error waiting for "
1582: "compression response.");
1.31 markus 1583: }
1584: /* Allocate a pseudo tty if appropriate. */
1585: if (tty_flag) {
1586: debug("Requesting pty.");
1587:
1588: /* Start the packet. */
1589: packet_start(SSH_CMSG_REQUEST_PTY);
1590:
1591: /* Store TERM in the packet. There is no limit on the
1592: length of the string. */
1593: cp = getenv("TERM");
1594: if (!cp)
1595: cp = "";
1.124 markus 1596: packet_put_cstring(cp);
1.31 markus 1597:
1598: /* Store window size in the packet. */
1599: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
1600: memset(&ws, 0, sizeof(ws));
1.269 deraadt 1601: packet_put_int((u_int)ws.ws_row);
1602: packet_put_int((u_int)ws.ws_col);
1603: packet_put_int((u_int)ws.ws_xpixel);
1604: packet_put_int((u_int)ws.ws_ypixel);
1.31 markus 1605:
1606: /* Store tty modes in the packet. */
1.115 stevesk 1607: tty_make_modes(fileno(stdin), NULL);
1.31 markus 1608:
1609: /* Send the packet, and wait for it to leave. */
1610: packet_send();
1611: packet_write_wait();
1612:
1613: /* Read response from the server. */
1.156 markus 1614: type = packet_read();
1.43 markus 1615: if (type == SSH_SMSG_SUCCESS) {
1.31 markus 1616: interactive = 1;
1.45 markus 1617: have_tty = 1;
1.43 markus 1618: } else if (type == SSH_SMSG_FAILURE)
1.316 djm 1619: logit("Warning: Remote host failed or refused to "
1620: "allocate a pseudo tty.");
1.31 markus 1621: else
1.316 djm 1622: packet_disconnect("Protocol error waiting for pty "
1623: "request response.");
1.31 markus 1624: }
1625: /* Request X11 forwarding if enabled and DISPLAY is set. */
1.243 djm 1626: display = getenv("DISPLAY");
1.417 djm 1627: if (display == NULL && options.forward_x11)
1628: debug("X11 forwarding requested but DISPLAY not set");
1.243 djm 1629: if (options.forward_x11 && display != NULL) {
1.150 stevesk 1630: char *proto, *data;
1.50 markus 1631: /* Get reasonable local authentication information. */
1.243 djm 1632: client_x11_get_proto(display, options.xauth_location,
1.384 djm 1633: options.forward_x11_trusted,
1.340 djm 1634: options.forward_x11_timeout,
1635: &proto, &data);
1.50 markus 1636: /* Request forwarding with authentication spoofing. */
1.316 djm 1637: debug("Requesting X11 forwarding with authentication "
1638: "spoofing.");
1.363 djm 1639: x11_request_forwarding_with_spoofing(0, display, proto,
1640: data, 0);
1.31 markus 1641: /* Read response from the server. */
1.156 markus 1642: type = packet_read();
1.31 markus 1643: if (type == SSH_SMSG_SUCCESS) {
1644: interactive = 1;
1.50 markus 1645: } else if (type == SSH_SMSG_FAILURE) {
1.191 itojun 1646: logit("Warning: Remote host denied X11 forwarding.");
1.50 markus 1647: } else {
1.316 djm 1648: packet_disconnect("Protocol error waiting for X11 "
1649: "forwarding");
1.50 markus 1650: }
1.31 markus 1651: }
1652: /* Tell the packet module whether this is an interactive session. */
1.354 djm 1653: packet_set_interactive(interactive,
1654: options.ip_qos_interactive, options.ip_qos_bulk);
1.31 markus 1655:
1656: /* Request authentication agent forwarding if appropriate. */
1.70 markus 1657: check_agent_present();
1658:
1.31 markus 1659: if (options.forward_agent) {
1660: debug("Requesting authentication agent forwarding.");
1661: auth_request_forwarding();
1662:
1663: /* Read response from the server. */
1.156 markus 1664: type = packet_read();
1.155 markus 1665: packet_check_eom();
1.31 markus 1666: if (type != SSH_SMSG_SUCCESS)
1.191 itojun 1667: logit("Warning: Remote host denied authentication agent forwarding.");
1.31 markus 1668: }
1669:
1.70 markus 1670: /* Initiate port forwardings. */
1.368 djm 1671: ssh_init_stdio_forwarding();
1.70 markus 1672: ssh_init_forwarding();
1.305 dtucker 1673:
1674: /* Execute a local command */
1675: if (options.local_command != NULL &&
1676: options.permit_local_command)
1677: ssh_local_cmd(options.local_command);
1.34 markus 1678:
1.318 djm 1679: /*
1680: * If requested and we are not interested in replies to remote
1681: * forwarding requests, then let ssh continue in the background.
1682: */
1.344 djm 1683: if (fork_after_authentication_flag) {
1684: if (options.exit_on_forward_failure &&
1685: options.num_remote_forwards > 0) {
1686: debug("deferring postauth fork until remote forward "
1687: "confirmation received");
1688: } else
1689: fork_postauth();
1.318 djm 1690: }
1.31 markus 1691:
1.33 markus 1692: /*
1693: * If a command was specified on the command line, execute the
1694: * command now. Otherwise request the server to start a shell.
1695: */
1.31 markus 1696: if (buffer_len(&command) > 0) {
1697: int len = buffer_len(&command);
1698: if (len > 900)
1699: len = 900;
1.316 djm 1700: debug("Sending command: %.*s", len,
1701: (u_char *)buffer_ptr(&command));
1.31 markus 1702: packet_start(SSH_CMSG_EXEC_CMD);
1703: packet_put_string(buffer_ptr(&command), buffer_len(&command));
1704: packet_send();
1705: packet_write_wait();
1706: } else {
1707: debug("Requesting shell.");
1708: packet_start(SSH_CMSG_EXEC_SHELL);
1709: packet_send();
1710: packet_write_wait();
1711: }
1712:
1713: /* Enter the interactive session. */
1.119 stevesk 1714: return client_loop(have_tty, tty_flag ?
1715: options.escape_char : SSH_ESCAPECHAR_NONE, 0);
1.89 markus 1716: }
1717:
1.214 djm 1718: /* request pty/x11/agent/tcpfwd/shell for channel */
1719: static void
1.337 djm 1720: ssh_session2_setup(int id, int success, void *arg)
1.214 djm 1721: {
1.215 djm 1722: extern char **environ;
1.243 djm 1723: const char *display;
1724: int interactive = tty_flag;
1.337 djm 1725:
1726: if (!success)
1727: return; /* No need for error message, channels code sens one */
1.215 djm 1728:
1.248 djm 1729: display = getenv("DISPLAY");
1.417 djm 1730: if (display == NULL && options.forward_x11)
1731: debug("X11 forwarding requested but DISPLAY not set");
1.243 djm 1732: if (options.forward_x11 && display != NULL) {
1.150 stevesk 1733: char *proto, *data;
1.50 markus 1734: /* Get reasonable local authentication information. */
1.243 djm 1735: client_x11_get_proto(display, options.xauth_location,
1.340 djm 1736: options.forward_x11_trusted,
1737: options.forward_x11_timeout, &proto, &data);
1.50 markus 1738: /* Request forwarding with authentication spoofing. */
1.316 djm 1739: debug("Requesting X11 forwarding with authentication "
1740: "spoofing.");
1.363 djm 1741: x11_request_forwarding_with_spoofing(id, display, proto,
1742: data, 1);
1743: client_expect_confirm(id, "X11 forwarding", CONFIRM_WARN);
1744: /* XXX exit_on_forward_failure */
1.80 markus 1745: interactive = 1;
1.50 markus 1746: }
1747:
1.70 markus 1748: check_agent_present();
1749: if (options.forward_agent) {
1750: debug("Requesting authentication agent forwarding.");
1751: channel_request_start(id, "auth-agent-req@openssh.com", 0);
1752: packet_send();
1.212 djm 1753: }
1.369 dtucker 1754:
1755: /* Tell the packet module whether this is an interactive session. */
1756: packet_set_interactive(interactive,
1757: options.ip_qos_interactive, options.ip_qos_bulk);
1.212 djm 1758:
1.214 djm 1759: client_session2_setup(id, tty_flag, subsystem_flag, getenv("TERM"),
1.311 djm 1760: NULL, fileno(stdin), &command, environ);
1.45 markus 1761: }
1762:
1.143 markus 1763: /* open new channel for a session */
1.126 itojun 1764: static int
1.143 markus 1765: ssh_session2_open(void)
1.45 markus 1766: {
1.118 markus 1767: Channel *c;
1768: int window, packetmax, in, out, err;
1.60 markus 1769:
1.62 markus 1770: if (stdin_null_flag) {
1.93 itojun 1771: in = open(_PATH_DEVNULL, O_RDONLY);
1.62 markus 1772: } else {
1773: in = dup(STDIN_FILENO);
1774: }
1.60 markus 1775: out = dup(STDOUT_FILENO);
1776: err = dup(STDERR_FILENO);
1.45 markus 1777:
1778: if (in < 0 || out < 0 || err < 0)
1.62 markus 1779: fatal("dup() in/out/err failed");
1.45 markus 1780:
1.69 markus 1781: /* enable nonblocking unless tty */
1782: if (!isatty(in))
1783: set_nonblock(in);
1784: if (!isatty(out))
1785: set_nonblock(out);
1786: if (!isatty(err))
1787: set_nonblock(err);
1788:
1.65 markus 1789: window = CHAN_SES_WINDOW_DEFAULT;
1790: packetmax = CHAN_SES_PACKET_DEFAULT;
1.164 markus 1791: if (tty_flag) {
1792: window >>= 1;
1793: packetmax >>= 1;
1.45 markus 1794: }
1.118 markus 1795: c = channel_new(
1.45 markus 1796: "session", SSH_CHANNEL_OPENING, in, out, err,
1.65 markus 1797: window, packetmax, CHAN_EXTENDED_WRITE,
1.192 markus 1798: "client-session", /*nonblock*/0);
1.45 markus 1799:
1.143 markus 1800: debug3("ssh_session2_open: channel_new: %d", c->self);
1.106 markus 1801:
1.122 markus 1802: channel_send_open(c->self);
1.143 markus 1803: if (!no_shell_flag)
1.310 djm 1804: channel_register_open_confirm(c->self,
1805: ssh_session2_setup, NULL);
1.106 markus 1806:
1.118 markus 1807: return c->self;
1.106 markus 1808: }
1809:
1.126 itojun 1810: static int
1.106 markus 1811: ssh_session2(void)
1812: {
1.143 markus 1813: int id = -1;
1.106 markus 1814:
1815: /* XXX should be pre-session */
1.368 djm 1816: if (!options.control_persist)
1817: ssh_init_stdio_forwarding();
1.106 markus 1818: ssh_init_forwarding();
1819:
1.344 djm 1820: /* Start listening for multiplex clients */
1821: muxserver_listen();
1822:
1823: /*
1.368 djm 1824: * If we are in control persist mode and have a working mux listen
1825: * socket, then prepare to background ourselves and have a foreground
1826: * client attach as a control slave.
1827: * NB. we must save copies of the flags that we override for
1.344 djm 1828: * the backgrounding, since we defer attachment of the slave until
1829: * after the connection is fully established (in particular,
1830: * async rfwd replies have been received for ExitOnForwardFailure).
1831: */
1832: if (options.control_persist && muxserver_sock != -1) {
1833: ostdin_null_flag = stdin_null_flag;
1834: ono_shell_flag = no_shell_flag;
1.359 djm 1835: orequest_tty = options.request_tty;
1.344 djm 1836: otty_flag = tty_flag;
1837: stdin_null_flag = 1;
1838: no_shell_flag = 1;
1839: tty_flag = 0;
1840: if (!fork_after_authentication_flag)
1841: need_controlpersist_detach = 1;
1842: fork_after_authentication_flag = 1;
1843: }
1.368 djm 1844: /*
1845: * ControlPersist mux listen socket setup failed, attempt the
1846: * stdio forward setup that we skipped earlier.
1847: */
1848: if (options.control_persist && muxserver_sock == -1)
1849: ssh_init_stdio_forwarding();
1.344 djm 1850:
1.143 markus 1851: if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN))
1852: id = ssh_session2_open();
1.379 djm 1853: else {
1854: packet_set_interactive(
1855: options.control_master == SSHCTL_MASTER_NO,
1856: options.ip_qos_interactive, options.ip_qos_bulk);
1857: }
1.314 djm 1858:
1859: /* If we don't expect to open a new session, then disallow it */
1.319 markus 1860: if (options.control_master == SSHCTL_MASTER_NO &&
1861: (datafellows & SSH_NEW_OPENSSH)) {
1.314 djm 1862: debug("Requesting no-more-sessions@openssh.com");
1863: packet_start(SSH2_MSG_GLOBAL_REQUEST);
1864: packet_put_cstring("no-more-sessions@openssh.com");
1865: packet_put_char(0);
1866: packet_send();
1867: }
1.255 reyk 1868:
1869: /* Execute a local command */
1870: if (options.local_command != NULL &&
1871: options.permit_local_command)
1872: ssh_local_cmd(options.local_command);
1.301 djm 1873:
1.342 djm 1874: /*
1875: * If requested and we are not interested in replies to remote
1876: * forwarding requests, then let ssh continue in the background.
1877: */
1.344 djm 1878: if (fork_after_authentication_flag) {
1879: if (options.exit_on_forward_failure &&
1880: options.num_remote_forwards > 0) {
1881: debug("deferring postauth fork until remote forward "
1882: "confirmation received");
1883: } else
1884: fork_postauth();
1.318 djm 1885: }
1.327 andreas 1886:
1887: if (options.use_roaming)
1888: request_roaming();
1.31 markus 1889:
1.119 stevesk 1890: return client_loop(tty_flag, tty_flag ?
1891: options.escape_char : SSH_ESCAPECHAR_NONE, id);
1.72 markus 1892: }
1893:
1.126 itojun 1894: static void
1.104 markus 1895: load_public_identity_files(void)
1896: {
1.275 djm 1897: char *filename, *cp, thishost[NI_MAXHOST];
1.306 deraadt 1898: char *pwdir = NULL, *pwname = NULL;
1.167 markus 1899: int i = 0;
1.104 markus 1900: Key *public;
1.275 djm 1901: struct passwd *pw;
1.335 djm 1902: u_int n_ids;
1903: char *identity_files[SSH_MAX_IDENTITY_FILES];
1904: Key *identity_keys[SSH_MAX_IDENTITY_FILES];
1.333 markus 1905: #ifdef ENABLE_PKCS11
1.167 markus 1906: Key **keys;
1.333 markus 1907: int nkeys;
1.335 djm 1908: #endif /* PKCS11 */
1.104 markus 1909:
1.335 djm 1910: n_ids = 0;
1.398 tedu 1911: memset(identity_files, 0, sizeof(identity_files));
1912: memset(identity_keys, 0, sizeof(identity_keys));
1.335 djm 1913:
1914: #ifdef ENABLE_PKCS11
1.333 markus 1915: if (options.pkcs11_provider != NULL &&
1.167 markus 1916: options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
1.333 markus 1917: (pkcs11_init(!options.batch_mode) == 0) &&
1918: (nkeys = pkcs11_add_provider(options.pkcs11_provider, NULL,
1919: &keys)) > 0) {
1920: for (i = 0; i < nkeys; i++) {
1.335 djm 1921: if (n_ids >= SSH_MAX_IDENTITY_FILES) {
1922: key_free(keys[i]);
1923: continue;
1924: }
1925: identity_keys[n_ids] = keys[i];
1926: identity_files[n_ids] =
1.333 markus 1927: xstrdup(options.pkcs11_provider); /* XXX */
1.335 djm 1928: n_ids++;
1.167 markus 1929: }
1.378 djm 1930: free(keys);
1.127 markus 1931: }
1.333 markus 1932: #endif /* ENABLE_PKCS11 */
1.275 djm 1933: if ((pw = getpwuid(original_real_uid)) == NULL)
1934: fatal("load_public_identity_files: getpwuid failed");
1.307 dtucker 1935: pwname = xstrdup(pw->pw_name);
1936: pwdir = xstrdup(pw->pw_dir);
1.275 djm 1937: if (gethostname(thishost, sizeof(thishost)) == -1)
1938: fatal("load_public_identity_files: gethostname: %s",
1939: strerror(errno));
1.335 djm 1940: for (i = 0; i < options.num_identity_files; i++) {
1.373 djm 1941: if (n_ids >= SSH_MAX_IDENTITY_FILES ||
1942: strcasecmp(options.identity_files[i], "none") == 0) {
1.378 djm 1943: free(options.identity_files[i]);
1.335 djm 1944: continue;
1945: }
1.275 djm 1946: cp = tilde_expand_filename(options.identity_files[i],
1.131 millert 1947: original_real_uid);
1.306 deraadt 1948: filename = percent_expand(cp, "d", pwdir,
1949: "u", pwname, "l", thishost, "h", host,
1.275 djm 1950: "r", options.user, (char *)NULL);
1.378 djm 1951: free(cp);
1.131 millert 1952: public = key_load_public(filename, NULL);
1953: debug("identity file %s type %d", filename,
1954: public ? public->type : -1);
1.378 djm 1955: free(options.identity_files[i]);
1.335 djm 1956: identity_files[n_ids] = filename;
1957: identity_keys[n_ids] = public;
1958:
1959: if (++n_ids >= SSH_MAX_IDENTITY_FILES)
1960: continue;
1961:
1962: /* Try to add the certificate variant too */
1963: xasprintf(&cp, "%s-cert", filename);
1964: public = key_load_public(cp, NULL);
1965: debug("identity file %s type %d", cp,
1966: public ? public->type : -1);
1967: if (public == NULL) {
1.378 djm 1968: free(cp);
1.335 djm 1969: continue;
1970: }
1971: if (!key_is_cert(public)) {
1972: debug("%s: key %s type %s is not a certificate",
1973: __func__, cp, key_type(public));
1974: key_free(public);
1.378 djm 1975: free(cp);
1.335 djm 1976: continue;
1977: }
1978: identity_keys[n_ids] = public;
1979: /* point to the original path, most likely the private key */
1980: identity_files[n_ids] = xstrdup(filename);
1981: n_ids++;
1982: }
1983: options.num_identity_files = n_ids;
1984: memcpy(options.identity_files, identity_files, sizeof(identity_files));
1985: memcpy(options.identity_keys, identity_keys, sizeof(identity_keys));
1986:
1.398 tedu 1987: explicit_bzero(pwname, strlen(pwname));
1.378 djm 1988: free(pwname);
1.398 tedu 1989: explicit_bzero(pwdir, strlen(pwdir));
1.378 djm 1990: free(pwdir);
1.214 djm 1991: }
1.352 djm 1992:
1993: static void
1994: main_sigchld_handler(int sig)
1995: {
1996: int save_errno = errno;
1997: pid_t pid;
1998: int status;
1999:
2000: while ((pid = waitpid(-1, &status, WNOHANG)) > 0 ||
2001: (pid < 0 && errno == EINTR))
2002: ;
2003:
2004: signal(sig, main_sigchld_handler);
2005: errno = save_errno;
2006: }
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