Annotation of src/usr.bin/ssh/ssh.c, Revision 1.420.2.2
1.420.2.2! sthen 1: /* $OpenBSD: ssh.c,v 1.420.2.1 2016/01/14 11:50:37 sthen 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':
600: logfile = xstrdup(optarg);
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
687: options.pkcs11_provider = xstrdup(optarg);
1.137 jakob 688: #else
1.333 markus 689: fprintf(stderr, "no support for PKCS#11.\n");
1.137 jakob 690: #endif
1.127 markus 691: break;
1.31 markus 692: case 't':
1.359 djm 693: if (options.request_tty == REQUEST_TTY_YES)
694: options.request_tty = REQUEST_TTY_FORCE;
695: else
696: options.request_tty = REQUEST_TTY_YES;
1.31 markus 697: break;
698: case 'v':
1.197 markus 699: if (debug_flag == 0) {
1.66 markus 700: debug_flag = 1;
701: options.log_level = SYSLOG_LEVEL_DEBUG1;
1.197 markus 702: } else {
703: if (options.log_level < SYSLOG_LEVEL_DEBUG3)
704: options.log_level++;
705: }
1.375 dtucker 706: break;
1.31 markus 707: case 'V':
1.209 markus 708: fprintf(stderr, "%s, %s\n",
1.402 markus 709: SSH_VERSION,
710: #ifdef WITH_OPENSSL
711: SSLeay_version(SSLEAY_VERSION)
712: #else
713: "without OpenSSL"
714: #endif
715: );
1.31 markus 716: if (opt == 'V')
717: exit(0);
718: break;
1.255 reyk 719: case 'w':
1.256 reyk 720: if (options.tun_open == -1)
721: options.tun_open = SSH_TUNMODE_DEFAULT;
1.255 reyk 722: options.tun_local = a2tun(optarg, &options.tun_remote);
1.256 reyk 723: if (options.tun_local == SSH_TUNID_ERR) {
1.316 djm 724: fprintf(stderr,
725: "Bad tun device '%s'\n", optarg);
1.257 dtucker 726: exit(255);
1.255 reyk 727: }
728: break;
1.331 dtucker 729: case 'W':
1.332 djm 730: if (stdio_forward_host != NULL)
731: fatal("stdio forward already specified");
732: if (muxclient_command != 0)
733: fatal("Cannot specify stdio forward with -O");
1.331 dtucker 734: if (parse_forward(&fwd, optarg, 1, 0)) {
735: stdio_forward_host = fwd.listen_host;
736: stdio_forward_port = fwd.listen_port;
1.378 djm 737: free(fwd.connect_host);
1.331 dtucker 738: } else {
739: fprintf(stderr,
740: "Bad stdio forwarding specification '%s'\n",
741: optarg);
742: exit(255);
743: }
1.359 djm 744: options.request_tty = REQUEST_TTY_NO;
1.331 dtucker 745: no_shell_flag = 1;
746: options.clear_forwardings = 1;
747: options.exit_on_forward_failure = 1;
748: break;
1.31 markus 749: case 'q':
750: options.log_level = SYSLOG_LEVEL_QUIET;
751: break;
752: case 'e':
753: if (optarg[0] == '^' && optarg[2] == 0 &&
1.128 fgsch 754: (u_char) optarg[1] >= 64 &&
755: (u_char) optarg[1] < 128)
1.78 markus 756: options.escape_char = (u_char) optarg[1] & 31;
1.31 markus 757: else if (strlen(optarg) == 1)
1.78 markus 758: options.escape_char = (u_char) optarg[0];
1.31 markus 759: else if (strcmp(optarg, "none") == 0)
1.119 stevesk 760: options.escape_char = SSH_ESCAPECHAR_NONE;
1.31 markus 761: else {
1.128 fgsch 762: fprintf(stderr, "Bad escape character '%s'.\n",
763: optarg);
1.257 dtucker 764: exit(255);
1.31 markus 765: }
766: break;
767: case 'c':
1.420 djm 768: if (ciphers_valid(*optarg == '+' ?
769: optarg + 1 : optarg)) {
1.49 markus 770: /* SSH2 only */
771: options.ciphers = xstrdup(optarg);
1.224 markus 772: options.cipher = SSH_CIPHER_INVALID;
1.420 djm 773: break;
774: }
775: /* SSH1 only */
776: options.cipher = cipher_number(optarg);
777: if (options.cipher == -1) {
778: fprintf(stderr, "Unknown cipher type '%s'\n",
779: optarg);
780: exit(255);
1.95 markus 781: }
1.420 djm 782: if (options.cipher == SSH_CIPHER_3DES)
783: options.ciphers = xstrdup("3des-cbc");
784: else if (options.cipher == SSH_CIPHER_BLOWFISH)
785: options.ciphers = xstrdup("blowfish-cbc");
786: else
787: options.ciphers = xstrdup(KEX_CLIENT_ENCRYPT);
1.95 markus 788: break;
789: case 'm':
790: if (mac_valid(optarg))
791: options.macs = xstrdup(optarg);
792: else {
1.128 fgsch 793: fprintf(stderr, "Unknown mac type '%s'\n",
794: optarg);
1.257 dtucker 795: exit(255);
1.31 markus 796: }
797: break;
1.214 djm 798: case 'M':
1.242 djm 799: if (options.control_master == SSHCTL_MASTER_YES)
800: options.control_master = SSHCTL_MASTER_ASK;
801: else
802: options.control_master = SSHCTL_MASTER_YES;
1.214 djm 803: break;
1.31 markus 804: case 'p':
1.113 stevesk 805: options.port = a2port(optarg);
1.323 djm 806: if (options.port <= 0) {
1.109 markus 807: fprintf(stderr, "Bad port '%s'\n", optarg);
1.257 dtucker 808: exit(255);
1.109 markus 809: }
1.31 markus 810: break;
811: case 'l':
812: options.user = optarg;
813: break;
1.141 stevesk 814:
815: case 'L':
1.324 djm 816: if (parse_forward(&fwd, optarg, 0, 0))
1.232 djm 817: add_local_forward(&options, &fwd);
818: else {
1.128 fgsch 819: fprintf(stderr,
1.232 djm 820: "Bad local forwarding specification '%s'\n",
1.128 fgsch 821: optarg);
1.257 dtucker 822: exit(255);
1.31 markus 823: }
1.232 djm 824: break;
825:
826: case 'R':
1.324 djm 827: if (parse_forward(&fwd, optarg, 0, 1)) {
1.232 djm 828: add_remote_forward(&options, &fwd);
829: } else {
1.128 fgsch 830: fprintf(stderr,
1.232 djm 831: "Bad remote forwarding specification "
832: "'%s'\n", optarg);
1.257 dtucker 833: exit(255);
1.31 markus 834: }
835: break;
1.108 markus 836:
837: case 'D':
1.324 djm 838: if (parse_forward(&fwd, optarg, 1, 0)) {
1.322 stevesk 839: add_local_forward(&options, &fwd);
1.232 djm 840: } else {
1.322 stevesk 841: fprintf(stderr,
842: "Bad dynamic forwarding specification "
843: "'%s'\n", optarg);
1.257 dtucker 844: exit(255);
1.109 markus 845: }
1.108 markus 846: break;
847:
1.31 markus 848: case 'C':
849: options.compression = 1;
850: break;
1.45 markus 851: case 'N':
852: no_shell_flag = 1;
1.359 djm 853: options.request_tty = REQUEST_TTY_NO;
1.45 markus 854: break;
855: case 'T':
1.359 djm 856: options.request_tty = REQUEST_TTY_NO;
1.45 markus 857: break;
1.31 markus 858: case 'o':
1.205 markus 859: line = xstrdup(optarg);
1.408 djm 860: if (process_config_line(&options, pw,
861: host ? host : "", host ? host : "", line,
862: "command-line", 0, NULL, SSHCONF_USERCONF) != 0)
1.257 dtucker 863: exit(255);
1.378 djm 864: free(line);
1.31 markus 865: break;
1.85 djm 866: case 's':
867: subsystem_flag = 1;
1.117 markus 868: break;
1.214 djm 869: case 'S':
870: if (options.control_path != NULL)
871: free(options.control_path);
872: options.control_path = xstrdup(optarg);
873: break;
1.117 markus 874: case 'b':
875: options.bind_address = optarg;
1.85 djm 876: break;
1.139 markus 877: case 'F':
878: config = optarg;
879: break;
1.31 markus 880: default:
881: usage();
1.1 deraadt 882: }
1.31 markus 883: }
884:
1.128 fgsch 885: ac -= optind;
886: av += optind;
887:
1.329 guenther 888: if (ac > 0 && !host) {
1.188 markus 889: if (strrchr(*av, '@')) {
1.128 fgsch 890: p = xstrdup(*av);
1.188 markus 891: cp = strrchr(p, '@');
1.128 fgsch 892: if (cp == NULL || cp == p)
893: usage();
894: options.user = p;
895: *cp = '\0';
1.385 djm 896: host = xstrdup(++cp);
1.128 fgsch 897: } else
1.385 djm 898: host = xstrdup(*av);
1.189 millert 899: if (ac > 1) {
900: optind = optreset = 1;
1.128 fgsch 901: goto again;
902: }
1.189 millert 903: ac--, av++;
1.128 fgsch 904: }
905:
1.31 markus 906: /* Check that we got a host name. */
907: if (!host)
908: usage();
909:
1.385 djm 910: host_arg = xstrdup(host);
911:
1.402 markus 912: #ifdef WITH_OPENSSL
1.350 djm 913: OpenSSL_add_all_algorithms();
1.72 markus 914: ERR_load_crypto_strings();
1.402 markus 915: #endif
1.31 markus 916:
917: /* Initialize the command to execute on remote host. */
918: buffer_init(&command);
1.1 deraadt 919:
1.33 markus 920: /*
921: * Save the command to execute on the remote host in a buffer. There
922: * is no limit on the length of the command, except by the maximum
923: * packet size. Also sets the tty flag if there is no command.
924: */
1.128 fgsch 925: if (!ac) {
1.31 markus 926: /* No command specified - execute shell on a tty. */
1.85 djm 927: if (subsystem_flag) {
1.128 fgsch 928: fprintf(stderr,
929: "You must specify a subsystem to invoke.\n");
1.85 djm 930: usage();
931: }
1.31 markus 932: } else {
1.128 fgsch 933: /* A command has been specified. Store it into the buffer. */
934: for (i = 0; i < ac; i++) {
935: if (i)
1.31 markus 936: buffer_append(&command, " ", 1);
937: buffer_append(&command, av[i], strlen(av[i]));
938: }
939: }
940:
941: /* Cannot fork to background if no command. */
1.316 djm 942: if (fork_after_authentication_flag && buffer_len(&command) == 0 &&
943: !no_shell_flag)
944: fatal("Cannot fork into background without a command "
945: "to execute.");
1.31 markus 946:
1.101 markus 947: /*
948: * Initialize "log" output. Since we are the client all output
1.375 dtucker 949: * goes to stderr unless otherwise specified by -y or -E.
1.101 markus 950: */
1.375 dtucker 951: if (use_syslog && logfile != NULL)
952: fatal("Can't specify both -y and -E");
953: if (logfile != NULL) {
954: log_redirect_stderr_to(logfile);
1.378 djm 955: free(logfile);
1.375 dtucker 956: }
1.325 markus 957: log_init(argv0,
1.316 djm 958: options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level,
1.320 djm 959: SYSLOG_FACILITY_USER, !use_syslog);
1.375 dtucker 960:
961: if (debug_flag)
1.402 markus 962: logit("%s, %s", SSH_VERSION,
963: #ifdef WITH_OPENSSL
964: SSLeay_version(SSLEAY_VERSION)
965: #else
966: "without OpenSSL"
967: #endif
968: );
1.31 markus 969:
1.400 djm 970: /* Parse the configuration files */
1.408 djm 971: process_config_files(host_arg, pw, 0);
1.400 djm 972:
973: /* Hostname canonicalisation needs a few options filled. */
974: fill_default_options_for_canonicalization(&options);
975:
976: /* If the user has replaced the hostname then take it into use now */
977: if (options.hostname != NULL) {
978: /* NB. Please keep in sync with readconf.c:match_cfg_line() */
979: cp = percent_expand(options.hostname,
980: "h", host, (char *)NULL);
981: free(host);
982: host = cp;
1.408 djm 983: free(options.hostname);
984: options.hostname = xstrdup(host);
1.400 djm 985: }
986:
987: /* If canonicalization requested then try to apply it */
988: lowercase(host);
989: if (options.canonicalize_hostname != SSH_CANONICALISE_NO)
990: addrs = resolve_canonicalize(&host, options.port);
991:
1.139 markus 992: /*
1.401 djm 993: * If CanonicalizePermittedCNAMEs have been specified but
994: * other canonicalization did not happen (by not being requested
995: * or by failing with fallback) then the hostname may still be changed
996: * as a result of CNAME following.
997: *
998: * Try to resolve the bare hostname name using the system resolver's
999: * usual search rules and then apply the CNAME follow rules.
1000: *
1001: * Skip the lookup if a ProxyCommand is being used unless the user
1002: * has specifically requested canonicalisation for this case via
1003: * CanonicalizeHostname=always
1.139 markus 1004: */
1.401 djm 1005: if (addrs == NULL && options.num_permitted_cnames != 0 &&
1006: (option_clear_or_none(options.proxy_command) ||
1.400 djm 1007: options.canonicalize_hostname == SSH_CANONICALISE_ALWAYS)) {
1.403 djm 1008: if ((addrs = resolve_host(host, options.port,
1009: option_clear_or_none(options.proxy_command),
1010: cname, sizeof(cname))) == NULL) {
1011: /* Don't fatal proxied host names not in the DNS */
1012: if (option_clear_or_none(options.proxy_command))
1013: cleanup_exit(255); /* logged in resolve_host */
1014: } else
1015: check_follow_cname(&host, cname);
1.400 djm 1016: }
1.139 markus 1017:
1.400 djm 1018: /*
1.408 djm 1019: * If canonicalisation is enabled then re-parse the configuration
1020: * files as new stanzas may match.
1.400 djm 1021: */
1.408 djm 1022: if (options.canonicalize_hostname != 0) {
1023: debug("Re-reading configuration after hostname "
1024: "canonicalisation");
1025: free(options.hostname);
1026: options.hostname = xstrdup(host);
1027: process_config_files(host_arg, pw, 1);
1028: /*
1029: * Address resolution happens early with canonicalisation
1030: * enabled and the port number may have changed since, so
1031: * reset it in address list
1032: */
1033: if (addrs != NULL && options.port > 0)
1034: set_addrinfo_port(addrs, options.port);
1.139 markus 1035: }
1.31 markus 1036:
1037: /* Fill configuration defaults. */
1038: fill_default_options(&options);
1039:
1.400 djm 1040: if (options.port == 0)
1041: options.port = default_ssh_port();
1.196 djm 1042: channel_set_af(options.address_family);
1043:
1.383 djm 1044: /* Tidy and check options */
1045: if (options.host_key_alias != NULL)
1046: lowercase(options.host_key_alias);
1047: if (options.proxy_command != NULL &&
1048: strcmp(options.proxy_command, "-") == 0 &&
1049: options.proxy_use_fdpass)
1050: fatal("ProxyCommand=- and ProxyUseFDPass are incompatible");
1.415 djm 1051: if (options.control_persist &&
1052: options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK) {
1053: debug("UpdateHostKeys=ask is incompatible with ControlPersist; "
1054: "disabling");
1055: options.update_hostkeys = 0;
1056: }
1.388 djm 1057: if (original_effective_uid != 0)
1058: options.use_privileged_port = 0;
1.383 djm 1059:
1.31 markus 1060: /* reinit */
1.325 markus 1061: log_init(argv0, options.log_level, SYSLOG_FACILITY_USER, !use_syslog);
1.370 djm 1062:
1063: if (options.request_tty == REQUEST_TTY_YES ||
1064: options.request_tty == REQUEST_TTY_FORCE)
1065: tty_flag = 1;
1066:
1067: /* Allocate a tty by default if no command specified. */
1068: if (buffer_len(&command) == 0)
1069: tty_flag = options.request_tty != REQUEST_TTY_NO;
1070:
1071: /* Force no tty */
1072: if (options.request_tty == REQUEST_TTY_NO || muxclient_command != 0)
1073: tty_flag = 0;
1074: /* Do not allocate a tty if stdin is not a tty. */
1075: if ((!isatty(fileno(stdin)) || stdin_null_flag) &&
1076: options.request_tty != REQUEST_TTY_FORCE) {
1077: if (tty_flag)
1078: logit("Pseudo-terminal will not be allocated because "
1079: "stdin is not a terminal.");
1080: tty_flag = 0;
1081: }
1.31 markus 1082:
1083: if (options.user == NULL)
1084: options.user = xstrdup(pw->pw_name);
1.343 djm 1085:
1.358 djm 1086: if (gethostname(thishost, sizeof(thishost)) == -1)
1087: fatal("gethostname: %s", strerror(errno));
1088: strlcpy(shorthost, thishost, sizeof(shorthost));
1089: shorthost[strcspn(thishost, ".")] = '\0';
1090: snprintf(portstr, sizeof(portstr), "%d", options.port);
1091:
1.405 djm 1092: if ((md = ssh_digest_start(SSH_DIGEST_SHA1)) == NULL ||
1093: ssh_digest_update(md, thishost, strlen(thishost)) < 0 ||
1094: ssh_digest_update(md, host, strlen(host)) < 0 ||
1095: ssh_digest_update(md, portstr, strlen(portstr)) < 0 ||
1096: ssh_digest_update(md, options.user, strlen(options.user)) < 0 ||
1097: ssh_digest_final(md, conn_hash, sizeof(conn_hash)) < 0)
1098: fatal("%s: mux digest failed", __func__);
1099: ssh_digest_free(md);
1100: conn_hash_hex = tohex(conn_hash, ssh_digest_bytes(SSH_DIGEST_SHA1));
1101:
1.317 dtucker 1102: if (options.local_command != NULL) {
1103: debug3("expanding LocalCommand: %s", options.local_command);
1104: cp = options.local_command;
1.405 djm 1105: options.local_command = percent_expand(cp,
1106: "C", conn_hash_hex,
1107: "L", shorthost,
1108: "d", pw->pw_dir,
1109: "h", host,
1110: "l", thishost,
1111: "n", host_arg,
1112: "p", portstr,
1113: "r", options.user,
1114: "u", pw->pw_name,
1.358 djm 1115: (char *)NULL);
1.317 dtucker 1116: debug3("expanded LocalCommand: %s", options.local_command);
1.378 djm 1117: free(cp);
1.304 dtucker 1118: }
1.31 markus 1119:
1.214 djm 1120: if (options.control_path != NULL) {
1.241 djm 1121: cp = tilde_expand_filename(options.control_path,
1122: original_real_uid);
1.378 djm 1123: free(options.control_path);
1.405 djm 1124: options.control_path = percent_expand(cp,
1125: "C", conn_hash_hex,
1126: "L", shorthost,
1127: "h", host,
1128: "l", thishost,
1129: "n", host_arg,
1130: "p", portstr,
1131: "r", options.user,
1132: "u", pw->pw_name,
1.358 djm 1133: (char *)NULL);
1.378 djm 1134: free(cp);
1.214 djm 1135: }
1.405 djm 1136: free(conn_hash_hex);
1.408 djm 1137:
1138: if (config_test) {
1139: dump_client_config(&options, host);
1140: exit(0);
1141: }
1.405 djm 1142:
1.312 djm 1143: if (muxclient_command != 0 && options.control_path == NULL)
1.240 djm 1144: fatal("No ControlPath specified for \"-O\" command");
1.242 djm 1145: if (options.control_path != NULL)
1.312 djm 1146: muxclient(options.control_path);
1.401 djm 1147:
1148: /*
1149: * If hostname canonicalisation was not enabled, then we may not
1150: * have yet resolved the hostname. Do so now.
1151: */
1152: if (addrs == NULL && options.proxy_command == NULL) {
1153: if ((addrs = resolve_host(host, options.port, 1,
1154: cname, sizeof(cname))) == NULL)
1155: cleanup_exit(255); /* resolve_host logs the error */
1156: }
1.214 djm 1157:
1.303 djm 1158: timeout_ms = options.connection_timeout * 1000;
1159:
1.77 markus 1160: /* Open a connection to the remote host. */
1.385 djm 1161: if (ssh_connect(host, addrs, &hostaddr, options.port,
1162: options.address_family, options.connection_attempts,
1163: &timeout_ms, options.tcp_keep_alive,
1.388 djm 1164: options.use_privileged_port) != 0)
1.257 dtucker 1165: exit(255);
1.31 markus 1166:
1.391 djm 1167: if (addrs != NULL)
1168: freeaddrinfo(addrs);
1169:
1.385 djm 1170: packet_set_timeout(options.server_alive_interval,
1171: options.server_alive_count_max);
1172:
1.303 djm 1173: if (timeout_ms > 0)
1174: debug3("timeout: %d ms remain after connect", timeout_ms);
1175:
1.33 markus 1176: /*
1177: * If we successfully made the connection, load the host private key
1178: * in case we will need it later for combined rsa-rhosts
1179: * authentication. This must be done before releasing extra
1180: * privileges, because the file is only readable by root.
1.174 markus 1181: * If we cannot access the private keys, load the public keys
1182: * instead and try to execute the ssh-keysign helper instead.
1.33 markus 1183: */
1.112 markus 1184: sensitive_data.nkeys = 0;
1185: sensitive_data.keys = NULL;
1.173 markus 1186: sensitive_data.external_keysign = 0;
1.178 markus 1187: if (options.rhosts_rsa_authentication ||
1188: options.hostbased_authentication) {
1.397 djm 1189: sensitive_data.nkeys = 9;
1.274 deraadt 1190: sensitive_data.keys = xcalloc(sensitive_data.nkeys,
1.180 deraadt 1191: sizeof(Key));
1.177 markus 1192:
1193: PRIV_START;
1.112 markus 1194: sensitive_data.keys[0] = key_load_private_type(KEY_RSA1,
1.276 dtucker 1195: _PATH_HOST_KEY_FILE, "", NULL, NULL);
1.411 djm 1196: sensitive_data.keys[1] = key_load_private_cert(KEY_ECDSA,
1.349 djm 1197: _PATH_HOST_ECDSA_KEY_FILE, "", NULL);
1.411 djm 1198: sensitive_data.keys[2] = key_load_private_cert(KEY_ED25519,
1199: _PATH_HOST_ED25519_KEY_FILE, "", NULL);
1.349 djm 1200: sensitive_data.keys[3] = key_load_private_cert(KEY_RSA,
1.345 djm 1201: _PATH_HOST_RSA_KEY_FILE, "", NULL);
1.411 djm 1202: sensitive_data.keys[4] = key_load_private_cert(KEY_DSA,
1203: _PATH_HOST_DSA_KEY_FILE, "", NULL);
1204: sensitive_data.keys[5] = key_load_private_type(KEY_ECDSA,
1.349 djm 1205: _PATH_HOST_ECDSA_KEY_FILE, "", NULL, NULL);
1.411 djm 1206: sensitive_data.keys[6] = key_load_private_type(KEY_ED25519,
1207: _PATH_HOST_ED25519_KEY_FILE, "", NULL, NULL);
1.397 djm 1208: sensitive_data.keys[7] = key_load_private_type(KEY_RSA,
1.276 dtucker 1209: _PATH_HOST_RSA_KEY_FILE, "", NULL, NULL);
1.411 djm 1210: sensitive_data.keys[8] = key_load_private_type(KEY_DSA,
1211: _PATH_HOST_DSA_KEY_FILE, "", NULL, NULL);
1.177 markus 1212: PRIV_END;
1.173 markus 1213:
1.181 markus 1214: if (options.hostbased_authentication == 1 &&
1215: sensitive_data.keys[0] == NULL &&
1.349 djm 1216: sensitive_data.keys[5] == NULL &&
1.396 markus 1217: sensitive_data.keys[6] == NULL &&
1.397 djm 1218: sensitive_data.keys[7] == NULL &&
1219: sensitive_data.keys[8] == NULL) {
1.345 djm 1220: sensitive_data.keys[1] = key_load_cert(
1.411 djm 1221: _PATH_HOST_ECDSA_KEY_FILE);
1.345 djm 1222: sensitive_data.keys[2] = key_load_cert(
1.411 djm 1223: _PATH_HOST_ED25519_KEY_FILE);
1.349 djm 1224: sensitive_data.keys[3] = key_load_cert(
1.345 djm 1225: _PATH_HOST_RSA_KEY_FILE);
1.397 djm 1226: sensitive_data.keys[4] = key_load_cert(
1.411 djm 1227: _PATH_HOST_DSA_KEY_FILE);
1.397 djm 1228: sensitive_data.keys[5] = key_load_public(
1.411 djm 1229: _PATH_HOST_ECDSA_KEY_FILE, NULL);
1.397 djm 1230: sensitive_data.keys[6] = key_load_public(
1.411 djm 1231: _PATH_HOST_ED25519_KEY_FILE, NULL);
1.397 djm 1232: sensitive_data.keys[7] = key_load_public(
1.173 markus 1233: _PATH_HOST_RSA_KEY_FILE, NULL);
1.397 djm 1234: sensitive_data.keys[8] = key_load_public(
1.411 djm 1235: _PATH_HOST_DSA_KEY_FILE, NULL);
1.173 markus 1236: sensitive_data.external_keysign = 1;
1237: }
1.31 markus 1238: }
1.33 markus 1239: /*
1240: * Get rid of any extra privileges that we may have. We will no
1241: * longer need them. Also, extra privileges could make it very hard
1242: * to read identity files and other non-world-readable files from the
1243: * user's home directory if it happens to be on a NFS volume where
1244: * root is mapped to nobody.
1245: */
1.225 dtucker 1246: if (original_effective_uid == 0) {
1247: PRIV_START;
1248: permanently_set_uid(pw);
1249: }
1.31 markus 1250:
1.33 markus 1251: /*
1252: * Now that we are back to our own permissions, create ~/.ssh
1.254 djm 1253: * directory if it doesn't already exist.
1.33 markus 1254: */
1.367 djm 1255: if (config == NULL) {
1256: r = snprintf(buf, sizeof buf, "%s%s%s", pw->pw_dir,
1257: strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR);
1258: if (r > 0 && (size_t)r < sizeof(buf) && stat(buf, &st) < 0)
1259: if (mkdir(buf, 0700) < 0)
1260: error("Could not create directory '%.200s'.",
1261: buf);
1262: }
1.31 markus 1263:
1.104 markus 1264: /* load options.identity_files */
1265: load_public_identity_files();
1266:
1267: /* Expand ~ in known host file names. */
1.361 djm 1268: tilde_expand_paths(options.system_hostfiles,
1269: options.num_system_hostfiles);
1270: tilde_expand_paths(options.user_hostfiles, options.num_user_hostfiles);
1.149 markus 1271:
1272: signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
1.352 djm 1273: signal(SIGCHLD, main_sigchld_handler);
1.31 markus 1274:
1.316 djm 1275: /* Log into the remote system. Never returns if the login fails. */
1.303 djm 1276: ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr,
1.355 djm 1277: options.port, pw, timeout_ms);
1.339 djm 1278:
1279: if (packet_connection_is_on_socket()) {
1280: verbose("Authenticated to %s ([%s]:%d).", host,
1281: get_remote_ipaddr(), get_remote_port());
1282: } else {
1283: verbose("Authenticated to %s (via proxy).", host);
1284: }
1.31 markus 1285:
1.112 markus 1286: /* We no longer need the private host keys. Clear them now. */
1287: if (sensitive_data.nkeys != 0) {
1288: for (i = 0; i < sensitive_data.nkeys; i++) {
1289: if (sensitive_data.keys[i] != NULL) {
1290: /* Destroys contents safely */
1291: debug3("clear hostkey %d", i);
1292: key_free(sensitive_data.keys[i]);
1293: sensitive_data.keys[i] = NULL;
1294: }
1295: }
1.378 djm 1296: free(sensitive_data.keys);
1.134 markus 1297: }
1298: for (i = 0; i < options.num_identity_files; i++) {
1.378 djm 1299: free(options.identity_files[i]);
1300: options.identity_files[i] = NULL;
1.134 markus 1301: if (options.identity_keys[i]) {
1302: key_free(options.identity_keys[i]);
1303: options.identity_keys[i] = NULL;
1304: }
1.112 markus 1305: }
1.31 markus 1306:
1.45 markus 1307: exit_status = compat20 ? ssh_session2() : ssh_session();
1308: packet_close();
1.186 djm 1309:
1.312 djm 1310: if (options.control_path != NULL && muxserver_sock != -1)
1.214 djm 1311: unlink(options.control_path);
1312:
1.353 djm 1313: /* Kill ProxyCommand if it is running. */
1314: ssh_kill_proxy_command();
1.186 djm 1315:
1.45 markus 1316: return exit_status;
1317: }
1318:
1.344 djm 1319: static void
1320: control_persist_detach(void)
1321: {
1322: pid_t pid;
1.346 djm 1323: int devnull;
1.344 djm 1324:
1325: debug("%s: backgrounding master process", __func__);
1326:
1327: /*
1328: * master (current process) into the background, and make the
1329: * foreground process a client of the backgrounded master.
1330: */
1331: switch ((pid = fork())) {
1332: case -1:
1333: fatal("%s: fork: %s", __func__, strerror(errno));
1334: case 0:
1335: /* Child: master process continues mainloop */
1336: break;
1337: default:
1338: /* Parent: set up mux slave to connect to backgrounded master */
1339: debug2("%s: background process is %ld", __func__, (long)pid);
1340: stdin_null_flag = ostdin_null_flag;
1.359 djm 1341: options.request_tty = orequest_tty;
1.344 djm 1342: tty_flag = otty_flag;
1343: close(muxserver_sock);
1344: muxserver_sock = -1;
1.351 markus 1345: options.control_master = SSHCTL_MASTER_NO;
1.344 djm 1346: muxclient(options.control_path);
1347: /* muxclient() doesn't return on success. */
1348: fatal("Failed to connect to new control master");
1349: }
1.346 djm 1350: if ((devnull = open(_PATH_DEVNULL, O_RDWR)) == -1) {
1351: error("%s: open(\"/dev/null\"): %s", __func__,
1352: strerror(errno));
1353: } else {
1354: if (dup2(devnull, STDIN_FILENO) == -1 ||
1355: dup2(devnull, STDOUT_FILENO) == -1)
1356: error("%s: dup2: %s", __func__, strerror(errno));
1357: if (devnull > STDERR_FILENO)
1358: close(devnull);
1359: }
1.381 djm 1360: daemon(1, 1);
1.362 djm 1361: setproctitle("%s [mux]", options.control_path);
1.344 djm 1362: }
1363:
1364: /* Do fork() after authentication. Used by "ssh -f" */
1365: static void
1366: fork_postauth(void)
1367: {
1368: if (need_controlpersist_detach)
1369: control_persist_detach();
1370: debug("forking to background");
1371: fork_after_authentication_flag = 0;
1372: if (daemon(1, 1) < 0)
1373: fatal("daemon() failed: %.200s", strerror(errno));
1374: }
1375:
1.315 djm 1376: /* Callback for remote forward global requests */
1377: static void
1378: ssh_confirm_remote_forward(int type, u_int32_t seq, void *ctxt)
1379: {
1.406 millert 1380: struct Forward *rfwd = (struct Forward *)ctxt;
1.315 djm 1381:
1.324 djm 1382: /* XXX verbose() on failure? */
1.404 markus 1383: debug("remote forward %s for: listen %s%s%d, connect %s:%d",
1.315 djm 1384: type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
1.406 millert 1385: rfwd->listen_path ? rfwd->listen_path :
1386: rfwd->listen_host ? rfwd->listen_host : "",
1387: (rfwd->listen_path || rfwd->listen_host) ? ":" : "",
1388: rfwd->listen_port, rfwd->connect_path ? rfwd->connect_path :
1389: rfwd->connect_host, rfwd->connect_port);
1390: if (rfwd->listen_path == NULL && rfwd->listen_port == 0) {
1.366 markus 1391: if (type == SSH2_MSG_REQUEST_SUCCESS) {
1392: rfwd->allocated_port = packet_get_int();
1393: logit("Allocated port %u for remote forward to %s:%d",
1394: rfwd->allocated_port,
1395: rfwd->connect_host, rfwd->connect_port);
1396: channel_update_permitted_opens(rfwd->handle,
1397: rfwd->allocated_port);
1398: } else {
1399: channel_update_permitted_opens(rfwd->handle, -1);
1400: }
1.324 djm 1401: }
1402:
1.315 djm 1403: if (type == SSH2_MSG_REQUEST_FAILURE) {
1.406 millert 1404: if (options.exit_on_forward_failure) {
1405: if (rfwd->listen_path != NULL)
1406: fatal("Error: remote port forwarding failed "
1407: "for listen path %s", rfwd->listen_path);
1408: else
1409: fatal("Error: remote port forwarding failed "
1410: "for listen port %d", rfwd->listen_port);
1411: } else {
1412: if (rfwd->listen_path != NULL)
1413: logit("Warning: remote port forwarding failed "
1414: "for listen path %s", rfwd->listen_path);
1415: else
1416: logit("Warning: remote port forwarding failed "
1417: "for listen port %d", rfwd->listen_port);
1418: }
1.315 djm 1419: }
1.318 djm 1420: if (++remote_forward_confirms_received == options.num_remote_forwards) {
1.315 djm 1421: debug("All remote forwarding requests processed");
1.344 djm 1422: if (fork_after_authentication_flag)
1423: fork_postauth();
1.318 djm 1424: }
1.315 djm 1425: }
1426:
1.126 itojun 1427: static void
1.331 dtucker 1428: client_cleanup_stdio_fwd(int id, void *arg)
1429: {
1430: debug("stdio forwarding: done");
1431: cleanup_exit(0);
1432: }
1433:
1.368 djm 1434: static void
1.407 djm 1435: ssh_stdio_confirm(int id, int success, void *arg)
1436: {
1437: if (!success)
1438: fatal("stdio forwarding failed");
1439: }
1440:
1441: static void
1.368 djm 1442: ssh_init_stdio_forwarding(void)
1.331 dtucker 1443: {
1444: Channel *c;
1.332 djm 1445: int in, out;
1.331 dtucker 1446:
1.368 djm 1447: if (stdio_forward_host == NULL)
1448: return;
1.384 djm 1449: if (!compat20)
1.368 djm 1450: fatal("stdio forwarding require Protocol 2");
1451:
1452: debug3("%s: %s:%d", __func__, stdio_forward_host, stdio_forward_port);
1.332 djm 1453:
1.368 djm 1454: if ((in = dup(STDIN_FILENO)) < 0 ||
1455: (out = dup(STDOUT_FILENO)) < 0)
1.332 djm 1456: fatal("channel_connect_stdio_fwd: dup() in/out failed");
1.368 djm 1457: if ((c = channel_connect_stdio_fwd(stdio_forward_host,
1458: stdio_forward_port, in, out)) == NULL)
1459: fatal("%s: channel_connect_stdio_fwd failed", __func__);
1.331 dtucker 1460: channel_register_cleanup(c->self, client_cleanup_stdio_fwd, 0);
1.407 djm 1461: channel_register_open_confirm(c->self, ssh_stdio_confirm, NULL);
1.331 dtucker 1462: }
1463:
1464: static void
1.70 markus 1465: ssh_init_forwarding(void)
1466: {
1.86 markus 1467: int success = 0;
1.70 markus 1468: int i;
1.331 dtucker 1469:
1.70 markus 1470: /* Initiate local TCP/IP port forwardings. */
1471: for (i = 0; i < options.num_local_forwards; i++) {
1.232 djm 1472: debug("Local connections to %.200s:%d forwarded to remote "
1473: "address %.200s:%d",
1.406 millert 1474: (options.local_forwards[i].listen_path != NULL) ?
1475: options.local_forwards[i].listen_path :
1.234 deraadt 1476: (options.local_forwards[i].listen_host == NULL) ?
1.406 millert 1477: (options.fwd_opts.gateway_ports ? "*" : "LOCALHOST") :
1.232 djm 1478: options.local_forwards[i].listen_host,
1479: options.local_forwards[i].listen_port,
1.406 millert 1480: (options.local_forwards[i].connect_path != NULL) ?
1481: options.local_forwards[i].connect_path :
1.232 djm 1482: options.local_forwards[i].connect_host,
1483: options.local_forwards[i].connect_port);
1.158 markus 1484: success += channel_setup_local_fwd_listener(
1.406 millert 1485: &options.local_forwards[i], &options.fwd_opts);
1.70 markus 1486: }
1.283 markus 1487: if (i > 0 && success != i && options.exit_on_forward_failure)
1488: fatal("Could not request local forwarding.");
1.86 markus 1489: if (i > 0 && success == 0)
1490: error("Could not request local forwarding.");
1.70 markus 1491:
1492: /* Initiate remote TCP/IP port forwardings. */
1493: for (i = 0; i < options.num_remote_forwards; i++) {
1.232 djm 1494: debug("Remote connections from %.200s:%d forwarded to "
1495: "local address %.200s:%d",
1.406 millert 1496: (options.remote_forwards[i].listen_path != NULL) ?
1497: options.remote_forwards[i].listen_path :
1.248 djm 1498: (options.remote_forwards[i].listen_host == NULL) ?
1.253 djm 1499: "LOCALHOST" : options.remote_forwards[i].listen_host,
1.232 djm 1500: options.remote_forwards[i].listen_port,
1.406 millert 1501: (options.remote_forwards[i].connect_path != NULL) ?
1502: options.remote_forwards[i].connect_path :
1.232 djm 1503: options.remote_forwards[i].connect_host,
1504: options.remote_forwards[i].connect_port);
1.366 markus 1505: options.remote_forwards[i].handle =
1506: channel_request_remote_forwarding(
1.406 millert 1507: &options.remote_forwards[i]);
1.366 markus 1508: if (options.remote_forwards[i].handle < 0) {
1.283 markus 1509: if (options.exit_on_forward_failure)
1510: fatal("Could not request remote forwarding.");
1511: else
1512: logit("Warning: Could not request remote "
1513: "forwarding.");
1.366 markus 1514: } else {
1515: client_register_global_confirm(ssh_confirm_remote_forward,
1516: &options.remote_forwards[i]);
1.283 markus 1517: }
1.70 markus 1518: }
1.301 djm 1519:
1520: /* Initiate tunnel forwarding. */
1521: if (options.tun_open != SSH_TUNMODE_NO) {
1522: if (client_request_tun_fwd(options.tun_open,
1523: options.tun_local, options.tun_remote) == -1) {
1524: if (options.exit_on_forward_failure)
1525: fatal("Could not request tunnel forwarding.");
1526: else
1527: error("Could not request tunnel forwarding.");
1528: }
1529: }
1.70 markus 1530: }
1531:
1.126 itojun 1532: static void
1.70 markus 1533: check_agent_present(void)
1534: {
1.412 djm 1535: int r;
1536:
1.70 markus 1537: if (options.forward_agent) {
1.254 djm 1538: /* Clear agent forwarding if we don't have an agent. */
1.412 djm 1539: if ((r = ssh_get_authentication_socket(NULL)) != 0) {
1.70 markus 1540: options.forward_agent = 0;
1.412 djm 1541: if (r != SSH_ERR_AGENT_NOT_PRESENT)
1542: debug("ssh_get_authentication_socket: %s",
1543: ssh_err(r));
1544: }
1.70 markus 1545: }
1546: }
1547:
1.126 itojun 1548: static int
1.45 markus 1549: ssh_session(void)
1550: {
1551: int type;
1552: int interactive = 0;
1553: int have_tty = 0;
1554: struct winsize ws;
1555: char *cp;
1.243 djm 1556: const char *display;
1.420.2.1 sthen 1557: char *proto = NULL, *data = NULL;
1.45 markus 1558:
1.31 markus 1559: /* Enable compression if requested. */
1560: if (options.compression) {
1.316 djm 1561: debug("Requesting compression at level %d.",
1562: options.compression_level);
1.31 markus 1563:
1.316 djm 1564: if (options.compression_level < 1 ||
1565: options.compression_level > 9)
1566: fatal("Compression level must be from 1 (fast) to "
1567: "9 (slow, best).");
1.31 markus 1568:
1569: /* Send the request. */
1570: packet_start(SSH_CMSG_REQUEST_COMPRESSION);
1571: packet_put_int(options.compression_level);
1572: packet_send();
1573: packet_write_wait();
1.156 markus 1574: type = packet_read();
1.31 markus 1575: if (type == SSH_SMSG_SUCCESS)
1576: packet_start_compression(options.compression_level);
1577: else if (type == SSH_SMSG_FAILURE)
1.191 itojun 1578: logit("Warning: Remote host refused compression.");
1.31 markus 1579: else
1.316 djm 1580: packet_disconnect("Protocol error waiting for "
1581: "compression response.");
1.31 markus 1582: }
1583: /* Allocate a pseudo tty if appropriate. */
1584: if (tty_flag) {
1585: debug("Requesting pty.");
1586:
1587: /* Start the packet. */
1588: packet_start(SSH_CMSG_REQUEST_PTY);
1589:
1590: /* Store TERM in the packet. There is no limit on the
1591: length of the string. */
1592: cp = getenv("TERM");
1593: if (!cp)
1594: cp = "";
1.124 markus 1595: packet_put_cstring(cp);
1.31 markus 1596:
1597: /* Store window size in the packet. */
1598: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
1599: memset(&ws, 0, sizeof(ws));
1.269 deraadt 1600: packet_put_int((u_int)ws.ws_row);
1601: packet_put_int((u_int)ws.ws_col);
1602: packet_put_int((u_int)ws.ws_xpixel);
1603: packet_put_int((u_int)ws.ws_ypixel);
1.31 markus 1604:
1605: /* Store tty modes in the packet. */
1.115 stevesk 1606: tty_make_modes(fileno(stdin), NULL);
1.31 markus 1607:
1608: /* Send the packet, and wait for it to leave. */
1609: packet_send();
1610: packet_write_wait();
1611:
1612: /* Read response from the server. */
1.156 markus 1613: type = packet_read();
1.43 markus 1614: if (type == SSH_SMSG_SUCCESS) {
1.31 markus 1615: interactive = 1;
1.45 markus 1616: have_tty = 1;
1.43 markus 1617: } else if (type == SSH_SMSG_FAILURE)
1.316 djm 1618: logit("Warning: Remote host failed or refused to "
1619: "allocate a pseudo tty.");
1.31 markus 1620: else
1.316 djm 1621: packet_disconnect("Protocol error waiting for pty "
1622: "request response.");
1.31 markus 1623: }
1624: /* Request X11 forwarding if enabled and DISPLAY is set. */
1.243 djm 1625: display = getenv("DISPLAY");
1.417 djm 1626: if (display == NULL && options.forward_x11)
1627: debug("X11 forwarding requested but DISPLAY not set");
1.420.2.1 sthen 1628: if (options.forward_x11 && client_x11_get_proto(display,
1629: options.xauth_location, options.forward_x11_trusted,
1630: options.forward_x11_timeout, &proto, &data) == 0) {
1.50 markus 1631: /* Request forwarding with authentication spoofing. */
1.316 djm 1632: debug("Requesting X11 forwarding with authentication "
1633: "spoofing.");
1.363 djm 1634: x11_request_forwarding_with_spoofing(0, display, proto,
1635: data, 0);
1.31 markus 1636: /* Read response from the server. */
1.156 markus 1637: type = packet_read();
1.31 markus 1638: if (type == SSH_SMSG_SUCCESS) {
1639: interactive = 1;
1.50 markus 1640: } else if (type == SSH_SMSG_FAILURE) {
1.191 itojun 1641: logit("Warning: Remote host denied X11 forwarding.");
1.50 markus 1642: } else {
1.316 djm 1643: packet_disconnect("Protocol error waiting for X11 "
1644: "forwarding");
1.50 markus 1645: }
1.31 markus 1646: }
1647: /* Tell the packet module whether this is an interactive session. */
1.354 djm 1648: packet_set_interactive(interactive,
1649: options.ip_qos_interactive, options.ip_qos_bulk);
1.31 markus 1650:
1651: /* Request authentication agent forwarding if appropriate. */
1.70 markus 1652: check_agent_present();
1653:
1.31 markus 1654: if (options.forward_agent) {
1655: debug("Requesting authentication agent forwarding.");
1656: auth_request_forwarding();
1657:
1658: /* Read response from the server. */
1.156 markus 1659: type = packet_read();
1.155 markus 1660: packet_check_eom();
1.31 markus 1661: if (type != SSH_SMSG_SUCCESS)
1.191 itojun 1662: logit("Warning: Remote host denied authentication agent forwarding.");
1.31 markus 1663: }
1664:
1.70 markus 1665: /* Initiate port forwardings. */
1.368 djm 1666: ssh_init_stdio_forwarding();
1.70 markus 1667: ssh_init_forwarding();
1.305 dtucker 1668:
1669: /* Execute a local command */
1670: if (options.local_command != NULL &&
1671: options.permit_local_command)
1672: ssh_local_cmd(options.local_command);
1.34 markus 1673:
1.318 djm 1674: /*
1675: * If requested and we are not interested in replies to remote
1676: * forwarding requests, then let ssh continue in the background.
1677: */
1.344 djm 1678: if (fork_after_authentication_flag) {
1679: if (options.exit_on_forward_failure &&
1680: options.num_remote_forwards > 0) {
1681: debug("deferring postauth fork until remote forward "
1682: "confirmation received");
1683: } else
1684: fork_postauth();
1.318 djm 1685: }
1.31 markus 1686:
1.33 markus 1687: /*
1688: * If a command was specified on the command line, execute the
1689: * command now. Otherwise request the server to start a shell.
1690: */
1.31 markus 1691: if (buffer_len(&command) > 0) {
1692: int len = buffer_len(&command);
1693: if (len > 900)
1694: len = 900;
1.316 djm 1695: debug("Sending command: %.*s", len,
1696: (u_char *)buffer_ptr(&command));
1.31 markus 1697: packet_start(SSH_CMSG_EXEC_CMD);
1698: packet_put_string(buffer_ptr(&command), buffer_len(&command));
1699: packet_send();
1700: packet_write_wait();
1701: } else {
1702: debug("Requesting shell.");
1703: packet_start(SSH_CMSG_EXEC_SHELL);
1704: packet_send();
1705: packet_write_wait();
1706: }
1707:
1708: /* Enter the interactive session. */
1.119 stevesk 1709: return client_loop(have_tty, tty_flag ?
1710: options.escape_char : SSH_ESCAPECHAR_NONE, 0);
1.89 markus 1711: }
1712:
1.214 djm 1713: /* request pty/x11/agent/tcpfwd/shell for channel */
1714: static void
1.337 djm 1715: ssh_session2_setup(int id, int success, void *arg)
1.214 djm 1716: {
1.215 djm 1717: extern char **environ;
1.243 djm 1718: const char *display;
1719: int interactive = tty_flag;
1.420.2.1 sthen 1720: char *proto = NULL, *data = NULL;
1.337 djm 1721:
1722: if (!success)
1723: return; /* No need for error message, channels code sens one */
1.215 djm 1724:
1.248 djm 1725: display = getenv("DISPLAY");
1.417 djm 1726: if (display == NULL && options.forward_x11)
1727: debug("X11 forwarding requested but DISPLAY not set");
1.420.2.1 sthen 1728: if (options.forward_x11 && client_x11_get_proto(display,
1729: options.xauth_location, options.forward_x11_trusted,
1730: options.forward_x11_timeout, &proto, &data) == 0) {
1.50 markus 1731: /* Request forwarding with authentication spoofing. */
1.316 djm 1732: debug("Requesting X11 forwarding with authentication "
1733: "spoofing.");
1.363 djm 1734: x11_request_forwarding_with_spoofing(id, display, proto,
1735: data, 1);
1736: client_expect_confirm(id, "X11 forwarding", CONFIRM_WARN);
1737: /* XXX exit_on_forward_failure */
1.80 markus 1738: interactive = 1;
1.50 markus 1739: }
1740:
1.70 markus 1741: check_agent_present();
1742: if (options.forward_agent) {
1743: debug("Requesting authentication agent forwarding.");
1744: channel_request_start(id, "auth-agent-req@openssh.com", 0);
1745: packet_send();
1.212 djm 1746: }
1.369 dtucker 1747:
1748: /* Tell the packet module whether this is an interactive session. */
1749: packet_set_interactive(interactive,
1750: options.ip_qos_interactive, options.ip_qos_bulk);
1.212 djm 1751:
1.214 djm 1752: client_session2_setup(id, tty_flag, subsystem_flag, getenv("TERM"),
1.311 djm 1753: NULL, fileno(stdin), &command, environ);
1.45 markus 1754: }
1755:
1.143 markus 1756: /* open new channel for a session */
1.126 itojun 1757: static int
1.143 markus 1758: ssh_session2_open(void)
1.45 markus 1759: {
1.118 markus 1760: Channel *c;
1761: int window, packetmax, in, out, err;
1.60 markus 1762:
1.62 markus 1763: if (stdin_null_flag) {
1.93 itojun 1764: in = open(_PATH_DEVNULL, O_RDONLY);
1.62 markus 1765: } else {
1766: in = dup(STDIN_FILENO);
1767: }
1.60 markus 1768: out = dup(STDOUT_FILENO);
1769: err = dup(STDERR_FILENO);
1.45 markus 1770:
1771: if (in < 0 || out < 0 || err < 0)
1.62 markus 1772: fatal("dup() in/out/err failed");
1.45 markus 1773:
1.69 markus 1774: /* enable nonblocking unless tty */
1775: if (!isatty(in))
1776: set_nonblock(in);
1777: if (!isatty(out))
1778: set_nonblock(out);
1779: if (!isatty(err))
1780: set_nonblock(err);
1781:
1.65 markus 1782: window = CHAN_SES_WINDOW_DEFAULT;
1783: packetmax = CHAN_SES_PACKET_DEFAULT;
1.164 markus 1784: if (tty_flag) {
1785: window >>= 1;
1786: packetmax >>= 1;
1.45 markus 1787: }
1.118 markus 1788: c = channel_new(
1.45 markus 1789: "session", SSH_CHANNEL_OPENING, in, out, err,
1.65 markus 1790: window, packetmax, CHAN_EXTENDED_WRITE,
1.192 markus 1791: "client-session", /*nonblock*/0);
1.45 markus 1792:
1.143 markus 1793: debug3("ssh_session2_open: channel_new: %d", c->self);
1.106 markus 1794:
1.122 markus 1795: channel_send_open(c->self);
1.143 markus 1796: if (!no_shell_flag)
1.310 djm 1797: channel_register_open_confirm(c->self,
1798: ssh_session2_setup, NULL);
1.106 markus 1799:
1.118 markus 1800: return c->self;
1.106 markus 1801: }
1802:
1.126 itojun 1803: static int
1.106 markus 1804: ssh_session2(void)
1805: {
1.143 markus 1806: int id = -1;
1.106 markus 1807:
1808: /* XXX should be pre-session */
1.368 djm 1809: if (!options.control_persist)
1810: ssh_init_stdio_forwarding();
1.106 markus 1811: ssh_init_forwarding();
1812:
1.344 djm 1813: /* Start listening for multiplex clients */
1814: muxserver_listen();
1815:
1816: /*
1.368 djm 1817: * If we are in control persist mode and have a working mux listen
1818: * socket, then prepare to background ourselves and have a foreground
1819: * client attach as a control slave.
1820: * NB. we must save copies of the flags that we override for
1.344 djm 1821: * the backgrounding, since we defer attachment of the slave until
1822: * after the connection is fully established (in particular,
1823: * async rfwd replies have been received for ExitOnForwardFailure).
1824: */
1825: if (options.control_persist && muxserver_sock != -1) {
1826: ostdin_null_flag = stdin_null_flag;
1827: ono_shell_flag = no_shell_flag;
1.359 djm 1828: orequest_tty = options.request_tty;
1.344 djm 1829: otty_flag = tty_flag;
1830: stdin_null_flag = 1;
1831: no_shell_flag = 1;
1832: tty_flag = 0;
1833: if (!fork_after_authentication_flag)
1834: need_controlpersist_detach = 1;
1835: fork_after_authentication_flag = 1;
1836: }
1.368 djm 1837: /*
1838: * ControlPersist mux listen socket setup failed, attempt the
1839: * stdio forward setup that we skipped earlier.
1840: */
1841: if (options.control_persist && muxserver_sock == -1)
1842: ssh_init_stdio_forwarding();
1.344 djm 1843:
1.143 markus 1844: if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN))
1845: id = ssh_session2_open();
1.379 djm 1846: else {
1847: packet_set_interactive(
1848: options.control_master == SSHCTL_MASTER_NO,
1849: options.ip_qos_interactive, options.ip_qos_bulk);
1850: }
1.314 djm 1851:
1852: /* If we don't expect to open a new session, then disallow it */
1.319 markus 1853: if (options.control_master == SSHCTL_MASTER_NO &&
1854: (datafellows & SSH_NEW_OPENSSH)) {
1.314 djm 1855: debug("Requesting no-more-sessions@openssh.com");
1856: packet_start(SSH2_MSG_GLOBAL_REQUEST);
1857: packet_put_cstring("no-more-sessions@openssh.com");
1858: packet_put_char(0);
1859: packet_send();
1860: }
1.255 reyk 1861:
1862: /* Execute a local command */
1863: if (options.local_command != NULL &&
1864: options.permit_local_command)
1865: ssh_local_cmd(options.local_command);
1.301 djm 1866:
1.342 djm 1867: /*
1868: * If requested and we are not interested in replies to remote
1869: * forwarding requests, then let ssh continue in the background.
1870: */
1.344 djm 1871: if (fork_after_authentication_flag) {
1872: if (options.exit_on_forward_failure &&
1873: options.num_remote_forwards > 0) {
1874: debug("deferring postauth fork until remote forward "
1875: "confirmation received");
1876: } else
1877: fork_postauth();
1.318 djm 1878: }
1.31 markus 1879:
1.119 stevesk 1880: return client_loop(tty_flag, tty_flag ?
1881: options.escape_char : SSH_ESCAPECHAR_NONE, id);
1.72 markus 1882: }
1883:
1.126 itojun 1884: static void
1.104 markus 1885: load_public_identity_files(void)
1886: {
1.275 djm 1887: char *filename, *cp, thishost[NI_MAXHOST];
1.306 deraadt 1888: char *pwdir = NULL, *pwname = NULL;
1.167 markus 1889: int i = 0;
1.104 markus 1890: Key *public;
1.275 djm 1891: struct passwd *pw;
1.335 djm 1892: u_int n_ids;
1893: char *identity_files[SSH_MAX_IDENTITY_FILES];
1894: Key *identity_keys[SSH_MAX_IDENTITY_FILES];
1.333 markus 1895: #ifdef ENABLE_PKCS11
1.167 markus 1896: Key **keys;
1.333 markus 1897: int nkeys;
1.335 djm 1898: #endif /* PKCS11 */
1.104 markus 1899:
1.335 djm 1900: n_ids = 0;
1.398 tedu 1901: memset(identity_files, 0, sizeof(identity_files));
1902: memset(identity_keys, 0, sizeof(identity_keys));
1.335 djm 1903:
1904: #ifdef ENABLE_PKCS11
1.333 markus 1905: if (options.pkcs11_provider != NULL &&
1.167 markus 1906: options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
1.333 markus 1907: (pkcs11_init(!options.batch_mode) == 0) &&
1908: (nkeys = pkcs11_add_provider(options.pkcs11_provider, NULL,
1909: &keys)) > 0) {
1910: for (i = 0; i < nkeys; i++) {
1.335 djm 1911: if (n_ids >= SSH_MAX_IDENTITY_FILES) {
1912: key_free(keys[i]);
1913: continue;
1914: }
1915: identity_keys[n_ids] = keys[i];
1916: identity_files[n_ids] =
1.333 markus 1917: xstrdup(options.pkcs11_provider); /* XXX */
1.335 djm 1918: n_ids++;
1.167 markus 1919: }
1.378 djm 1920: free(keys);
1.127 markus 1921: }
1.333 markus 1922: #endif /* ENABLE_PKCS11 */
1.275 djm 1923: if ((pw = getpwuid(original_real_uid)) == NULL)
1924: fatal("load_public_identity_files: getpwuid failed");
1.307 dtucker 1925: pwname = xstrdup(pw->pw_name);
1926: pwdir = xstrdup(pw->pw_dir);
1.275 djm 1927: if (gethostname(thishost, sizeof(thishost)) == -1)
1928: fatal("load_public_identity_files: gethostname: %s",
1929: strerror(errno));
1.335 djm 1930: for (i = 0; i < options.num_identity_files; i++) {
1.373 djm 1931: if (n_ids >= SSH_MAX_IDENTITY_FILES ||
1932: strcasecmp(options.identity_files[i], "none") == 0) {
1.378 djm 1933: free(options.identity_files[i]);
1.335 djm 1934: continue;
1935: }
1.275 djm 1936: cp = tilde_expand_filename(options.identity_files[i],
1.131 millert 1937: original_real_uid);
1.306 deraadt 1938: filename = percent_expand(cp, "d", pwdir,
1939: "u", pwname, "l", thishost, "h", host,
1.275 djm 1940: "r", options.user, (char *)NULL);
1.378 djm 1941: free(cp);
1.131 millert 1942: public = key_load_public(filename, NULL);
1943: debug("identity file %s type %d", filename,
1944: public ? public->type : -1);
1.378 djm 1945: free(options.identity_files[i]);
1.335 djm 1946: identity_files[n_ids] = filename;
1947: identity_keys[n_ids] = public;
1948:
1949: if (++n_ids >= SSH_MAX_IDENTITY_FILES)
1950: continue;
1951:
1952: /* Try to add the certificate variant too */
1953: xasprintf(&cp, "%s-cert", filename);
1954: public = key_load_public(cp, NULL);
1955: debug("identity file %s type %d", cp,
1956: public ? public->type : -1);
1957: if (public == NULL) {
1.378 djm 1958: free(cp);
1.335 djm 1959: continue;
1960: }
1961: if (!key_is_cert(public)) {
1962: debug("%s: key %s type %s is not a certificate",
1963: __func__, cp, key_type(public));
1964: key_free(public);
1.378 djm 1965: free(cp);
1.335 djm 1966: continue;
1967: }
1968: identity_keys[n_ids] = public;
1969: /* point to the original path, most likely the private key */
1970: identity_files[n_ids] = xstrdup(filename);
1971: n_ids++;
1972: }
1973: options.num_identity_files = n_ids;
1974: memcpy(options.identity_files, identity_files, sizeof(identity_files));
1975: memcpy(options.identity_keys, identity_keys, sizeof(identity_keys));
1976:
1.398 tedu 1977: explicit_bzero(pwname, strlen(pwname));
1.378 djm 1978: free(pwname);
1.398 tedu 1979: explicit_bzero(pwdir, strlen(pwdir));
1.378 djm 1980: free(pwdir);
1.214 djm 1981: }
1.352 djm 1982:
1983: static void
1984: main_sigchld_handler(int sig)
1985: {
1986: int save_errno = errno;
1987: pid_t pid;
1988: int status;
1989:
1990: while ((pid = waitpid(-1, &status, WNOHANG)) > 0 ||
1991: (pid < 0 && errno == EINTR))
1992: ;
1993:
1994: signal(sig, main_sigchld_handler);
1995: errno = save_errno;
1996: }
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