Annotation of src/usr.bin/ssh/ssh.c, Revision 1.423
1.423 ! djm 1: /* $OpenBSD: ssh.c,v 1.422 2015/09/04 08:21:47 dtucker Exp $ */
1.1 deraadt 2: /*
1.32 deraadt 3: * Author: Tatu Ylonen <ylo@cs.hut.fi>
4: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5: * All rights reserved
6: * Ssh client program. This program can be used to log into a remote machine.
7: * The software supports strong authentication, encryption, and forwarding
8: * of X11, TCP/IP, and authentication connections.
9: *
1.64 deraadt 10: * As far as I am concerned, the code I have written for this software
11: * can be used freely for any purpose. Any derived versions of this
12: * software must be clearly marked as such, and if the derived work is
13: * incompatible with the protocol description in the RFC file, it must be
14: * called by a name other than "ssh" or "Secure Shell".
15: *
16: * Copyright (c) 1999 Niels Provos. All rights reserved.
1.202 markus 17: * Copyright (c) 2000, 2001, 2002, 2003 Markus Friedl. All rights reserved.
1.64 deraadt 18: *
19: * Modified to work with SSL by Niels Provos <provos@citi.umich.edu>
20: * in Canada (German citizen).
21: *
22: * Redistribution and use in source and binary forms, with or without
23: * modification, are permitted provided that the following conditions
24: * are met:
25: * 1. Redistributions of source code must retain the above copyright
26: * notice, this list of conditions and the following disclaimer.
27: * 2. Redistributions in binary form must reproduce the above copyright
28: * notice, this list of conditions and the following disclaimer in the
29: * documentation and/or other materials provided with the distribution.
30: *
31: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
32: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
33: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
34: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
35: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
36: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
37: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
38: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
39: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
40: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.32 deraadt 41: */
1.1 deraadt 42:
1.293 deraadt 43: #include <sys/types.h>
1.312 djm 44: #include <sys/ioctl.h>
45: #include <sys/queue.h>
1.259 stevesk 46: #include <sys/resource.h>
1.280 stevesk 47: #include <sys/socket.h>
1.264 stevesk 48: #include <sys/stat.h>
1.312 djm 49: #include <sys/time.h>
1.352 djm 50: #include <sys/wait.h>
1.258 stevesk 51:
1.265 stevesk 52: #include <ctype.h>
1.285 stevesk 53: #include <errno.h>
1.281 stevesk 54: #include <fcntl.h>
1.286 stevesk 55: #include <netdb.h>
1.258 stevesk 56: #include <paths.h>
1.279 stevesk 57: #include <pwd.h>
1.263 stevesk 58: #include <signal.h>
1.287 stevesk 59: #include <stddef.h>
1.291 stevesk 60: #include <stdio.h>
1.290 stevesk 61: #include <stdlib.h>
1.289 stevesk 62: #include <string.h>
1.288 stevesk 63: #include <unistd.h>
1.414 deraadt 64: #include <limits.h>
1.49 markus 65:
1.402 markus 66: #ifdef WITH_OPENSSL
1.49 markus 67: #include <openssl/evp.h>
1.72 markus 68: #include <openssl/err.h>
1.402 markus 69: #endif
1.1 deraadt 70:
1.293 deraadt 71: #include "xmalloc.h"
1.84 markus 72: #include "ssh.h"
73: #include "ssh1.h"
74: #include "ssh2.h"
1.341 djm 75: #include "canohost.h"
1.84 markus 76: #include "compat.h"
77: #include "cipher.h"
1.405 djm 78: #include "digest.h"
1.1 deraadt 79: #include "packet.h"
80: #include "buffer.h"
1.123 markus 81: #include "channels.h"
1.49 markus 82: #include "key.h"
1.58 markus 83: #include "authfd.h"
1.49 markus 84: #include "authfile.h"
1.83 markus 85: #include "pathnames.h"
1.214 djm 86: #include "dispatch.h"
1.81 markus 87: #include "clientloop.h"
1.84 markus 88: #include "log.h"
1.406 millert 89: #include "misc.h"
1.84 markus 90: #include "readconf.h"
91: #include "sshconnect.h"
1.95 markus 92: #include "kex.h"
93: #include "mac.h"
1.213 deraadt 94: #include "sshpty.h"
1.212 djm 95: #include "match.h"
1.214 djm 96: #include "msg.h"
1.225 dtucker 97: #include "uidswap.h"
1.327 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];
1.423 ! djm 494: char cname[NI_MAXHOST], uidstr[32], *conn_hash_hex;
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];
1.250 djm 504:
505: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
506: sanitise_stdfd();
1.31 markus 507:
1.33 markus 508: /*
1.346 djm 509: * Discard other fds that are hanging around. These can cause problem
510: * with backgrounded ssh processes started by ControlPersist.
511: */
512: closefrom(STDERR_FILENO + 1);
513:
514: /*
1.33 markus 515: * Save the original real uid. It will be needed later (uid-swapping
516: * may clobber the real uid).
517: */
1.31 markus 518: original_real_uid = getuid();
519: original_effective_uid = geteuid();
520:
1.184 stevesk 521: /*
522: * Use uid-swapping to give up root privileges for the duration of
523: * option processing. We will re-instantiate the rights when we are
524: * ready to create the privileged port, and will permanently drop
525: * them when the port has been created (actually, when the connection
526: * has been made, as we may need to create the port several times).
527: */
528: PRIV_END;
529:
1.31 markus 530: /* If we are installed setuid root be careful to not drop core. */
531: if (original_real_uid != original_effective_uid) {
532: struct rlimit rlim;
533: rlim.rlim_cur = rlim.rlim_max = 0;
534: if (setrlimit(RLIMIT_CORE, &rlim) < 0)
535: fatal("setrlimit failed: %.100s", strerror(errno));
1.1 deraadt 536: }
1.107 markus 537: /* Get user data. */
538: pw = getpwuid(original_real_uid);
539: if (!pw) {
1.380 djm 540: logit("No user exists for uid %lu", (u_long)original_real_uid);
1.257 dtucker 541: exit(255);
1.107 markus 542: }
543: /* Take a copy of the returned structure. */
544: pw = pwcopy(pw);
1.31 markus 545:
1.33 markus 546: /*
547: * Set our umask to something reasonable, as some files are created
548: * with the default umask. This will make them world-readable but
549: * writable only by the owner, which is ok for all files for which we
550: * don't set the modes explicitly.
551: */
1.31 markus 552: umask(022);
553:
1.316 djm 554: /*
555: * Initialize option structure to indicate that no values have been
556: * set.
557: */
1.31 markus 558: initialize_options(&options);
559:
560: /* Parse command-line arguments. */
561: host = NULL;
1.320 djm 562: use_syslog = 0;
1.375 dtucker 563: logfile = NULL;
1.325 markus 564: argv0 = av[0];
1.31 markus 565:
1.266 djm 566: again:
1.316 djm 567: while ((opt = getopt(ac, av, "1246ab:c:e:fgi:kl:m:no:p:qstvx"
1.408 djm 568: "ACD:E:F:GI:KL:MNO:PQ:R:S:TVw:W:XYy")) != -1) {
1.31 markus 569: switch (opt) {
1.91 jakob 570: case '1':
571: options.protocol = SSH_PROTO_1;
572: break;
1.47 markus 573: case '2':
574: options.protocol = SSH_PROTO_2;
575: break;
1.37 markus 576: case '4':
1.196 djm 577: options.address_family = AF_INET;
1.37 markus 578: break;
579: case '6':
1.196 djm 580: options.address_family = AF_INET6;
1.37 markus 581: break;
1.31 markus 582: case 'n':
583: stdin_null_flag = 1;
584: break;
585: case 'f':
586: fork_after_authentication_flag = 1;
587: stdin_null_flag = 1;
588: break;
589: case 'x':
590: options.forward_x11 = 0;
591: break;
592: case 'X':
593: options.forward_x11 = 1;
594: break;
1.320 djm 595: case 'y':
596: use_syslog = 1;
597: break;
1.375 dtucker 598: case 'E':
1.422 dtucker 599: logfile = optarg;
1.375 dtucker 600: break;
1.408 djm 601: case 'G':
602: config_test = 1;
603: break;
1.202 markus 604: case 'Y':
605: options.forward_x11 = 1;
606: options.forward_x11_trusted = 1;
607: break;
1.31 markus 608: case 'g':
1.406 millert 609: options.fwd_opts.gateway_ports = 1;
1.31 markus 610: break;
1.229 djm 611: case 'O':
1.332 djm 612: if (stdio_forward_host != NULL)
613: fatal("Cannot specify multiplexing "
614: "command with -W");
615: else if (muxclient_command != 0)
616: fatal("Multiplexing command already specified");
1.229 djm 617: if (strcmp(optarg, "check") == 0)
1.312 djm 618: muxclient_command = SSHMUX_COMMAND_ALIVE_CHECK;
1.338 markus 619: else if (strcmp(optarg, "forward") == 0)
620: muxclient_command = SSHMUX_COMMAND_FORWARD;
1.229 djm 621: else if (strcmp(optarg, "exit") == 0)
1.312 djm 622: muxclient_command = SSHMUX_COMMAND_TERMINATE;
1.357 djm 623: else if (strcmp(optarg, "stop") == 0)
624: muxclient_command = SSHMUX_COMMAND_STOP;
1.365 djm 625: else if (strcmp(optarg, "cancel") == 0)
626: muxclient_command = SSHMUX_COMMAND_CANCEL_FWD;
1.229 djm 627: else
628: fatal("Invalid multiplex command.");
629: break;
1.183 stevesk 630: case 'P': /* deprecated */
1.31 markus 631: options.use_privileged_port = 0;
1.376 djm 632: break;
1.394 deraadt 633: case 'Q':
1.376 djm 634: cp = NULL;
1.394 deraadt 635: if (strcmp(optarg, "cipher") == 0)
1.393 djm 636: cp = cipher_alg_list('\n', 0);
1.394 deraadt 637: else if (strcmp(optarg, "cipher-auth") == 0)
1.393 djm 638: cp = cipher_alg_list('\n', 1);
1.394 deraadt 639: else if (strcmp(optarg, "mac") == 0)
1.392 dtucker 640: cp = mac_alg_list('\n');
1.394 deraadt 641: else if (strcmp(optarg, "kex") == 0)
1.392 dtucker 642: cp = kex_alg_list('\n');
1.394 deraadt 643: else if (strcmp(optarg, "key") == 0)
1.396 markus 644: cp = key_alg_list(0, 0);
645: else if (strcmp(optarg, "key-cert") == 0)
646: cp = key_alg_list(1, 0);
647: else if (strcmp(optarg, "key-plain") == 0)
648: cp = key_alg_list(0, 1);
1.416 djm 649: else if (strcmp(optarg, "protocol-version") == 0) {
650: #ifdef WITH_SSH1
651: cp = xstrdup("1\n2");
652: #else
653: cp = xstrdup("2");
654: #endif
655: }
1.376 djm 656: if (cp == NULL)
657: fatal("Unsupported query \"%s\"", optarg);
658: printf("%s\n", cp);
659: free(cp);
660: exit(0);
1.31 markus 661: break;
662: case 'a':
663: options.forward_agent = 0;
1.53 markus 664: break;
665: case 'A':
666: options.forward_agent = 1;
1.31 markus 667: break;
668: case 'k':
1.204 dtucker 669: options.gss_deleg_creds = 0;
1.297 djm 670: break;
671: case 'K':
672: options.gss_authentication = 1;
673: options.gss_deleg_creds = 1;
1.31 markus 674: break;
675: case 'i':
676: if (stat(optarg, &st) < 0) {
1.128 fgsch 677: fprintf(stderr, "Warning: Identity file %s "
1.231 otto 678: "not accessible: %s.\n", optarg,
679: strerror(errno));
1.31 markus 680: break;
681: }
1.371 dtucker 682: add_identity_file(&options, NULL, optarg, 1);
1.31 markus 683: break;
1.127 markus 684: case 'I':
1.333 markus 685: #ifdef ENABLE_PKCS11
1.422 dtucker 686: free(options.pkcs11_provider);
1.333 markus 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 */
1.422 dtucker 771: free(options.ciphers);
1.49 markus 772: options.ciphers = xstrdup(optarg);
1.224 markus 773: options.cipher = SSH_CIPHER_INVALID;
1.420 djm 774: break;
775: }
776: /* SSH1 only */
777: options.cipher = cipher_number(optarg);
778: if (options.cipher == -1) {
779: fprintf(stderr, "Unknown cipher type '%s'\n",
780: optarg);
781: exit(255);
1.95 markus 782: }
1.420 djm 783: if (options.cipher == SSH_CIPHER_3DES)
784: options.ciphers = xstrdup("3des-cbc");
785: else if (options.cipher == SSH_CIPHER_BLOWFISH)
786: options.ciphers = xstrdup("blowfish-cbc");
787: else
788: options.ciphers = xstrdup(KEX_CLIENT_ENCRYPT);
1.95 markus 789: break;
790: case 'm':
1.422 dtucker 791: if (mac_valid(optarg)) {
792: free(options.macs);
1.95 markus 793: options.macs = xstrdup(optarg);
1.422 dtucker 794: } else {
1.128 fgsch 795: fprintf(stderr, "Unknown mac type '%s'\n",
796: optarg);
1.257 dtucker 797: exit(255);
1.31 markus 798: }
799: break;
1.214 djm 800: case 'M':
1.242 djm 801: if (options.control_master == SSHCTL_MASTER_YES)
802: options.control_master = SSHCTL_MASTER_ASK;
803: else
804: options.control_master = SSHCTL_MASTER_YES;
1.214 djm 805: break;
1.31 markus 806: case 'p':
1.113 stevesk 807: options.port = a2port(optarg);
1.323 djm 808: if (options.port <= 0) {
1.109 markus 809: fprintf(stderr, "Bad port '%s'\n", optarg);
1.257 dtucker 810: exit(255);
1.109 markus 811: }
1.31 markus 812: break;
813: case 'l':
814: options.user = optarg;
815: break;
1.141 stevesk 816:
817: case 'L':
1.324 djm 818: if (parse_forward(&fwd, optarg, 0, 0))
1.232 djm 819: add_local_forward(&options, &fwd);
820: else {
1.128 fgsch 821: fprintf(stderr,
1.232 djm 822: "Bad local forwarding specification '%s'\n",
1.128 fgsch 823: optarg);
1.257 dtucker 824: exit(255);
1.31 markus 825: }
1.232 djm 826: break;
827:
828: case 'R':
1.324 djm 829: if (parse_forward(&fwd, optarg, 0, 1)) {
1.232 djm 830: add_remote_forward(&options, &fwd);
831: } else {
1.128 fgsch 832: fprintf(stderr,
1.232 djm 833: "Bad remote forwarding specification "
834: "'%s'\n", optarg);
1.257 dtucker 835: exit(255);
1.31 markus 836: }
837: break;
1.108 markus 838:
839: case 'D':
1.324 djm 840: if (parse_forward(&fwd, optarg, 1, 0)) {
1.322 stevesk 841: add_local_forward(&options, &fwd);
1.232 djm 842: } else {
1.322 stevesk 843: fprintf(stderr,
844: "Bad dynamic forwarding specification "
845: "'%s'\n", optarg);
1.257 dtucker 846: exit(255);
1.109 markus 847: }
1.108 markus 848: break;
849:
1.31 markus 850: case 'C':
851: options.compression = 1;
852: break;
1.45 markus 853: case 'N':
854: no_shell_flag = 1;
1.359 djm 855: options.request_tty = REQUEST_TTY_NO;
1.45 markus 856: break;
857: case 'T':
1.359 djm 858: options.request_tty = REQUEST_TTY_NO;
1.45 markus 859: break;
1.31 markus 860: case 'o':
1.205 markus 861: line = xstrdup(optarg);
1.408 djm 862: if (process_config_line(&options, pw,
863: host ? host : "", host ? host : "", line,
864: "command-line", 0, NULL, SSHCONF_USERCONF) != 0)
1.257 dtucker 865: exit(255);
1.378 djm 866: free(line);
1.31 markus 867: break;
1.85 djm 868: case 's':
869: subsystem_flag = 1;
1.117 markus 870: break;
1.214 djm 871: case 'S':
872: if (options.control_path != NULL)
873: free(options.control_path);
874: options.control_path = xstrdup(optarg);
875: break;
1.117 markus 876: case 'b':
877: options.bind_address = optarg;
1.85 djm 878: break;
1.139 markus 879: case 'F':
880: config = optarg;
881: break;
1.31 markus 882: default:
883: usage();
1.1 deraadt 884: }
1.31 markus 885: }
886:
1.128 fgsch 887: ac -= optind;
888: av += optind;
889:
1.329 guenther 890: if (ac > 0 && !host) {
1.188 markus 891: if (strrchr(*av, '@')) {
1.128 fgsch 892: p = xstrdup(*av);
1.188 markus 893: cp = strrchr(p, '@');
1.128 fgsch 894: if (cp == NULL || cp == p)
895: usage();
896: options.user = p;
897: *cp = '\0';
1.385 djm 898: host = xstrdup(++cp);
1.128 fgsch 899: } else
1.385 djm 900: host = xstrdup(*av);
1.189 millert 901: if (ac > 1) {
902: optind = optreset = 1;
1.128 fgsch 903: goto again;
904: }
1.189 millert 905: ac--, av++;
1.128 fgsch 906: }
907:
1.31 markus 908: /* Check that we got a host name. */
909: if (!host)
910: usage();
911:
1.385 djm 912: host_arg = xstrdup(host);
913:
1.402 markus 914: #ifdef WITH_OPENSSL
1.350 djm 915: OpenSSL_add_all_algorithms();
1.72 markus 916: ERR_load_crypto_strings();
1.402 markus 917: #endif
1.31 markus 918:
919: /* Initialize the command to execute on remote host. */
920: buffer_init(&command);
1.1 deraadt 921:
1.33 markus 922: /*
923: * Save the command to execute on the remote host in a buffer. There
924: * is no limit on the length of the command, except by the maximum
925: * packet size. Also sets the tty flag if there is no command.
926: */
1.128 fgsch 927: if (!ac) {
1.31 markus 928: /* No command specified - execute shell on a tty. */
1.85 djm 929: if (subsystem_flag) {
1.128 fgsch 930: fprintf(stderr,
931: "You must specify a subsystem to invoke.\n");
1.85 djm 932: usage();
933: }
1.31 markus 934: } else {
1.128 fgsch 935: /* A command has been specified. Store it into the buffer. */
936: for (i = 0; i < ac; i++) {
937: if (i)
1.31 markus 938: buffer_append(&command, " ", 1);
939: buffer_append(&command, av[i], strlen(av[i]));
940: }
941: }
942:
943: /* Cannot fork to background if no command. */
1.316 djm 944: if (fork_after_authentication_flag && buffer_len(&command) == 0 &&
945: !no_shell_flag)
946: fatal("Cannot fork into background without a command "
947: "to execute.");
1.31 markus 948:
1.101 markus 949: /*
950: * Initialize "log" output. Since we are the client all output
1.375 dtucker 951: * goes to stderr unless otherwise specified by -y or -E.
1.101 markus 952: */
1.375 dtucker 953: if (use_syslog && logfile != NULL)
954: fatal("Can't specify both -y and -E");
1.422 dtucker 955: if (logfile != NULL)
1.375 dtucker 956: log_redirect_stderr_to(logfile);
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);
1.423 ! djm 1091: snprintf(uidstr, sizeof(uidstr), "%d", pw->pw_uid);
1.358 djm 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,
1.423 ! djm 1134: "i", uidstr,
1.358 djm 1135: (char *)NULL);
1.378 djm 1136: free(cp);
1.214 djm 1137: }
1.405 djm 1138: free(conn_hash_hex);
1.408 djm 1139:
1140: if (config_test) {
1141: dump_client_config(&options, host);
1142: exit(0);
1143: }
1.405 djm 1144:
1.312 djm 1145: if (muxclient_command != 0 && options.control_path == NULL)
1.240 djm 1146: fatal("No ControlPath specified for \"-O\" command");
1.242 djm 1147: if (options.control_path != NULL)
1.312 djm 1148: muxclient(options.control_path);
1.401 djm 1149:
1150: /*
1151: * If hostname canonicalisation was not enabled, then we may not
1152: * have yet resolved the hostname. Do so now.
1153: */
1154: if (addrs == NULL && options.proxy_command == NULL) {
1.421 djm 1155: debug2("resolving \"%s\" port %d", host, options.port);
1.401 djm 1156: if ((addrs = resolve_host(host, options.port, 1,
1157: cname, sizeof(cname))) == NULL)
1158: cleanup_exit(255); /* resolve_host logs the error */
1159: }
1.214 djm 1160:
1.303 djm 1161: timeout_ms = options.connection_timeout * 1000;
1162:
1.77 markus 1163: /* Open a connection to the remote host. */
1.385 djm 1164: if (ssh_connect(host, addrs, &hostaddr, options.port,
1165: options.address_family, options.connection_attempts,
1166: &timeout_ms, options.tcp_keep_alive,
1.388 djm 1167: options.use_privileged_port) != 0)
1.257 dtucker 1168: exit(255);
1.31 markus 1169:
1.391 djm 1170: if (addrs != NULL)
1171: freeaddrinfo(addrs);
1172:
1.385 djm 1173: packet_set_timeout(options.server_alive_interval,
1174: options.server_alive_count_max);
1175:
1.303 djm 1176: if (timeout_ms > 0)
1177: debug3("timeout: %d ms remain after connect", timeout_ms);
1178:
1.33 markus 1179: /*
1180: * If we successfully made the connection, load the host private key
1181: * in case we will need it later for combined rsa-rhosts
1182: * authentication. This must be done before releasing extra
1183: * privileges, because the file is only readable by root.
1.174 markus 1184: * If we cannot access the private keys, load the public keys
1185: * instead and try to execute the ssh-keysign helper instead.
1.33 markus 1186: */
1.112 markus 1187: sensitive_data.nkeys = 0;
1188: sensitive_data.keys = NULL;
1.173 markus 1189: sensitive_data.external_keysign = 0;
1.178 markus 1190: if (options.rhosts_rsa_authentication ||
1191: options.hostbased_authentication) {
1.397 djm 1192: sensitive_data.nkeys = 9;
1.274 deraadt 1193: sensitive_data.keys = xcalloc(sensitive_data.nkeys,
1.180 deraadt 1194: sizeof(Key));
1.177 markus 1195:
1196: PRIV_START;
1.112 markus 1197: sensitive_data.keys[0] = key_load_private_type(KEY_RSA1,
1.276 dtucker 1198: _PATH_HOST_KEY_FILE, "", NULL, NULL);
1.411 djm 1199: sensitive_data.keys[1] = key_load_private_cert(KEY_ECDSA,
1.349 djm 1200: _PATH_HOST_ECDSA_KEY_FILE, "", NULL);
1.411 djm 1201: sensitive_data.keys[2] = key_load_private_cert(KEY_ED25519,
1202: _PATH_HOST_ED25519_KEY_FILE, "", NULL);
1.349 djm 1203: sensitive_data.keys[3] = key_load_private_cert(KEY_RSA,
1.345 djm 1204: _PATH_HOST_RSA_KEY_FILE, "", NULL);
1.411 djm 1205: sensitive_data.keys[4] = key_load_private_cert(KEY_DSA,
1206: _PATH_HOST_DSA_KEY_FILE, "", NULL);
1207: sensitive_data.keys[5] = key_load_private_type(KEY_ECDSA,
1.349 djm 1208: _PATH_HOST_ECDSA_KEY_FILE, "", NULL, NULL);
1.411 djm 1209: sensitive_data.keys[6] = key_load_private_type(KEY_ED25519,
1210: _PATH_HOST_ED25519_KEY_FILE, "", NULL, NULL);
1.397 djm 1211: sensitive_data.keys[7] = key_load_private_type(KEY_RSA,
1.276 dtucker 1212: _PATH_HOST_RSA_KEY_FILE, "", NULL, NULL);
1.411 djm 1213: sensitive_data.keys[8] = key_load_private_type(KEY_DSA,
1214: _PATH_HOST_DSA_KEY_FILE, "", NULL, NULL);
1.177 markus 1215: PRIV_END;
1.173 markus 1216:
1.181 markus 1217: if (options.hostbased_authentication == 1 &&
1218: sensitive_data.keys[0] == NULL &&
1.349 djm 1219: sensitive_data.keys[5] == NULL &&
1.396 markus 1220: sensitive_data.keys[6] == NULL &&
1.397 djm 1221: sensitive_data.keys[7] == NULL &&
1222: sensitive_data.keys[8] == NULL) {
1.345 djm 1223: sensitive_data.keys[1] = key_load_cert(
1.411 djm 1224: _PATH_HOST_ECDSA_KEY_FILE);
1.345 djm 1225: sensitive_data.keys[2] = key_load_cert(
1.411 djm 1226: _PATH_HOST_ED25519_KEY_FILE);
1.349 djm 1227: sensitive_data.keys[3] = key_load_cert(
1.345 djm 1228: _PATH_HOST_RSA_KEY_FILE);
1.397 djm 1229: sensitive_data.keys[4] = key_load_cert(
1.411 djm 1230: _PATH_HOST_DSA_KEY_FILE);
1.397 djm 1231: sensitive_data.keys[5] = key_load_public(
1.411 djm 1232: _PATH_HOST_ECDSA_KEY_FILE, NULL);
1.397 djm 1233: sensitive_data.keys[6] = key_load_public(
1.411 djm 1234: _PATH_HOST_ED25519_KEY_FILE, NULL);
1.397 djm 1235: sensitive_data.keys[7] = key_load_public(
1.173 markus 1236: _PATH_HOST_RSA_KEY_FILE, NULL);
1.397 djm 1237: sensitive_data.keys[8] = key_load_public(
1.411 djm 1238: _PATH_HOST_DSA_KEY_FILE, NULL);
1.173 markus 1239: sensitive_data.external_keysign = 1;
1240: }
1.31 markus 1241: }
1.33 markus 1242: /*
1243: * Get rid of any extra privileges that we may have. We will no
1244: * longer need them. Also, extra privileges could make it very hard
1245: * to read identity files and other non-world-readable files from the
1246: * user's home directory if it happens to be on a NFS volume where
1247: * root is mapped to nobody.
1248: */
1.225 dtucker 1249: if (original_effective_uid == 0) {
1250: PRIV_START;
1251: permanently_set_uid(pw);
1252: }
1.31 markus 1253:
1.33 markus 1254: /*
1255: * Now that we are back to our own permissions, create ~/.ssh
1.254 djm 1256: * directory if it doesn't already exist.
1.33 markus 1257: */
1.367 djm 1258: if (config == NULL) {
1259: r = snprintf(buf, sizeof buf, "%s%s%s", pw->pw_dir,
1260: strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR);
1261: if (r > 0 && (size_t)r < sizeof(buf) && stat(buf, &st) < 0)
1262: if (mkdir(buf, 0700) < 0)
1263: error("Could not create directory '%.200s'.",
1264: buf);
1265: }
1.31 markus 1266:
1.104 markus 1267: /* load options.identity_files */
1268: load_public_identity_files();
1269:
1270: /* Expand ~ in known host file names. */
1.361 djm 1271: tilde_expand_paths(options.system_hostfiles,
1272: options.num_system_hostfiles);
1273: tilde_expand_paths(options.user_hostfiles, options.num_user_hostfiles);
1.149 markus 1274:
1275: signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
1.352 djm 1276: signal(SIGCHLD, main_sigchld_handler);
1.31 markus 1277:
1.316 djm 1278: /* Log into the remote system. Never returns if the login fails. */
1.303 djm 1279: ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr,
1.355 djm 1280: options.port, pw, timeout_ms);
1.339 djm 1281:
1282: if (packet_connection_is_on_socket()) {
1283: verbose("Authenticated to %s ([%s]:%d).", host,
1284: get_remote_ipaddr(), get_remote_port());
1285: } else {
1286: verbose("Authenticated to %s (via proxy).", host);
1287: }
1.31 markus 1288:
1.112 markus 1289: /* We no longer need the private host keys. Clear them now. */
1290: if (sensitive_data.nkeys != 0) {
1291: for (i = 0; i < sensitive_data.nkeys; i++) {
1292: if (sensitive_data.keys[i] != NULL) {
1293: /* Destroys contents safely */
1294: debug3("clear hostkey %d", i);
1295: key_free(sensitive_data.keys[i]);
1296: sensitive_data.keys[i] = NULL;
1297: }
1298: }
1.378 djm 1299: free(sensitive_data.keys);
1.134 markus 1300: }
1301: for (i = 0; i < options.num_identity_files; i++) {
1.378 djm 1302: free(options.identity_files[i]);
1303: options.identity_files[i] = NULL;
1.134 markus 1304: if (options.identity_keys[i]) {
1305: key_free(options.identity_keys[i]);
1306: options.identity_keys[i] = NULL;
1307: }
1.112 markus 1308: }
1.31 markus 1309:
1.45 markus 1310: exit_status = compat20 ? ssh_session2() : ssh_session();
1311: packet_close();
1.186 djm 1312:
1.312 djm 1313: if (options.control_path != NULL && muxserver_sock != -1)
1.214 djm 1314: unlink(options.control_path);
1315:
1.353 djm 1316: /* Kill ProxyCommand if it is running. */
1317: ssh_kill_proxy_command();
1.186 djm 1318:
1.45 markus 1319: return exit_status;
1320: }
1321:
1.344 djm 1322: static void
1323: control_persist_detach(void)
1324: {
1325: pid_t pid;
1.346 djm 1326: int devnull;
1.344 djm 1327:
1328: debug("%s: backgrounding master process", __func__);
1329:
1330: /*
1331: * master (current process) into the background, and make the
1332: * foreground process a client of the backgrounded master.
1333: */
1334: switch ((pid = fork())) {
1335: case -1:
1336: fatal("%s: fork: %s", __func__, strerror(errno));
1337: case 0:
1338: /* Child: master process continues mainloop */
1339: break;
1340: default:
1341: /* Parent: set up mux slave to connect to backgrounded master */
1342: debug2("%s: background process is %ld", __func__, (long)pid);
1343: stdin_null_flag = ostdin_null_flag;
1.359 djm 1344: options.request_tty = orequest_tty;
1.344 djm 1345: tty_flag = otty_flag;
1346: close(muxserver_sock);
1347: muxserver_sock = -1;
1.351 markus 1348: options.control_master = SSHCTL_MASTER_NO;
1.344 djm 1349: muxclient(options.control_path);
1350: /* muxclient() doesn't return on success. */
1351: fatal("Failed to connect to new control master");
1352: }
1.346 djm 1353: if ((devnull = open(_PATH_DEVNULL, O_RDWR)) == -1) {
1354: error("%s: open(\"/dev/null\"): %s", __func__,
1355: strerror(errno));
1356: } else {
1357: if (dup2(devnull, STDIN_FILENO) == -1 ||
1358: dup2(devnull, STDOUT_FILENO) == -1)
1359: error("%s: dup2: %s", __func__, strerror(errno));
1360: if (devnull > STDERR_FILENO)
1361: close(devnull);
1362: }
1.381 djm 1363: daemon(1, 1);
1.362 djm 1364: setproctitle("%s [mux]", options.control_path);
1.344 djm 1365: }
1366:
1367: /* Do fork() after authentication. Used by "ssh -f" */
1368: static void
1369: fork_postauth(void)
1370: {
1371: if (need_controlpersist_detach)
1372: control_persist_detach();
1373: debug("forking to background");
1374: fork_after_authentication_flag = 0;
1375: if (daemon(1, 1) < 0)
1376: fatal("daemon() failed: %.200s", strerror(errno));
1377: }
1378:
1.315 djm 1379: /* Callback for remote forward global requests */
1380: static void
1381: ssh_confirm_remote_forward(int type, u_int32_t seq, void *ctxt)
1382: {
1.406 millert 1383: struct Forward *rfwd = (struct Forward *)ctxt;
1.315 djm 1384:
1.324 djm 1385: /* XXX verbose() on failure? */
1.404 markus 1386: debug("remote forward %s for: listen %s%s%d, connect %s:%d",
1.315 djm 1387: type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
1.406 millert 1388: rfwd->listen_path ? rfwd->listen_path :
1389: rfwd->listen_host ? rfwd->listen_host : "",
1390: (rfwd->listen_path || rfwd->listen_host) ? ":" : "",
1391: rfwd->listen_port, rfwd->connect_path ? rfwd->connect_path :
1392: rfwd->connect_host, rfwd->connect_port);
1393: if (rfwd->listen_path == NULL && rfwd->listen_port == 0) {
1.366 markus 1394: if (type == SSH2_MSG_REQUEST_SUCCESS) {
1395: rfwd->allocated_port = packet_get_int();
1396: logit("Allocated port %u for remote forward to %s:%d",
1397: rfwd->allocated_port,
1398: rfwd->connect_host, rfwd->connect_port);
1399: channel_update_permitted_opens(rfwd->handle,
1400: rfwd->allocated_port);
1401: } else {
1402: channel_update_permitted_opens(rfwd->handle, -1);
1403: }
1.324 djm 1404: }
1405:
1.315 djm 1406: if (type == SSH2_MSG_REQUEST_FAILURE) {
1.406 millert 1407: if (options.exit_on_forward_failure) {
1408: if (rfwd->listen_path != NULL)
1409: fatal("Error: remote port forwarding failed "
1410: "for listen path %s", rfwd->listen_path);
1411: else
1412: fatal("Error: remote port forwarding failed "
1413: "for listen port %d", rfwd->listen_port);
1414: } else {
1415: if (rfwd->listen_path != NULL)
1416: logit("Warning: remote port forwarding failed "
1417: "for listen path %s", rfwd->listen_path);
1418: else
1419: logit("Warning: remote port forwarding failed "
1420: "for listen port %d", rfwd->listen_port);
1421: }
1.315 djm 1422: }
1.318 djm 1423: if (++remote_forward_confirms_received == options.num_remote_forwards) {
1.315 djm 1424: debug("All remote forwarding requests processed");
1.344 djm 1425: if (fork_after_authentication_flag)
1426: fork_postauth();
1.318 djm 1427: }
1.315 djm 1428: }
1429:
1.126 itojun 1430: static void
1.331 dtucker 1431: client_cleanup_stdio_fwd(int id, void *arg)
1432: {
1433: debug("stdio forwarding: done");
1434: cleanup_exit(0);
1435: }
1436:
1.368 djm 1437: static void
1.407 djm 1438: ssh_stdio_confirm(int id, int success, void *arg)
1439: {
1440: if (!success)
1441: fatal("stdio forwarding failed");
1442: }
1443:
1444: static void
1.368 djm 1445: ssh_init_stdio_forwarding(void)
1.331 dtucker 1446: {
1447: Channel *c;
1.332 djm 1448: int in, out;
1.331 dtucker 1449:
1.368 djm 1450: if (stdio_forward_host == NULL)
1451: return;
1.384 djm 1452: if (!compat20)
1.368 djm 1453: fatal("stdio forwarding require Protocol 2");
1454:
1455: debug3("%s: %s:%d", __func__, stdio_forward_host, stdio_forward_port);
1.332 djm 1456:
1.368 djm 1457: if ((in = dup(STDIN_FILENO)) < 0 ||
1458: (out = dup(STDOUT_FILENO)) < 0)
1.332 djm 1459: fatal("channel_connect_stdio_fwd: dup() in/out failed");
1.368 djm 1460: if ((c = channel_connect_stdio_fwd(stdio_forward_host,
1461: stdio_forward_port, in, out)) == NULL)
1462: fatal("%s: channel_connect_stdio_fwd failed", __func__);
1.331 dtucker 1463: channel_register_cleanup(c->self, client_cleanup_stdio_fwd, 0);
1.407 djm 1464: channel_register_open_confirm(c->self, ssh_stdio_confirm, NULL);
1.331 dtucker 1465: }
1466:
1467: static void
1.70 markus 1468: ssh_init_forwarding(void)
1469: {
1.86 markus 1470: int success = 0;
1.70 markus 1471: int i;
1.331 dtucker 1472:
1.70 markus 1473: /* Initiate local TCP/IP port forwardings. */
1474: for (i = 0; i < options.num_local_forwards; i++) {
1.232 djm 1475: debug("Local connections to %.200s:%d forwarded to remote "
1476: "address %.200s:%d",
1.406 millert 1477: (options.local_forwards[i].listen_path != NULL) ?
1478: options.local_forwards[i].listen_path :
1.234 deraadt 1479: (options.local_forwards[i].listen_host == NULL) ?
1.406 millert 1480: (options.fwd_opts.gateway_ports ? "*" : "LOCALHOST") :
1.232 djm 1481: options.local_forwards[i].listen_host,
1482: options.local_forwards[i].listen_port,
1.406 millert 1483: (options.local_forwards[i].connect_path != NULL) ?
1484: options.local_forwards[i].connect_path :
1.232 djm 1485: options.local_forwards[i].connect_host,
1486: options.local_forwards[i].connect_port);
1.158 markus 1487: success += channel_setup_local_fwd_listener(
1.406 millert 1488: &options.local_forwards[i], &options.fwd_opts);
1.70 markus 1489: }
1.283 markus 1490: if (i > 0 && success != i && options.exit_on_forward_failure)
1491: fatal("Could not request local forwarding.");
1.86 markus 1492: if (i > 0 && success == 0)
1493: error("Could not request local forwarding.");
1.70 markus 1494:
1495: /* Initiate remote TCP/IP port forwardings. */
1496: for (i = 0; i < options.num_remote_forwards; i++) {
1.232 djm 1497: debug("Remote connections from %.200s:%d forwarded to "
1498: "local address %.200s:%d",
1.406 millert 1499: (options.remote_forwards[i].listen_path != NULL) ?
1500: options.remote_forwards[i].listen_path :
1.248 djm 1501: (options.remote_forwards[i].listen_host == NULL) ?
1.253 djm 1502: "LOCALHOST" : options.remote_forwards[i].listen_host,
1.232 djm 1503: options.remote_forwards[i].listen_port,
1.406 millert 1504: (options.remote_forwards[i].connect_path != NULL) ?
1505: options.remote_forwards[i].connect_path :
1.232 djm 1506: options.remote_forwards[i].connect_host,
1507: options.remote_forwards[i].connect_port);
1.366 markus 1508: options.remote_forwards[i].handle =
1509: channel_request_remote_forwarding(
1.406 millert 1510: &options.remote_forwards[i]);
1.366 markus 1511: if (options.remote_forwards[i].handle < 0) {
1.283 markus 1512: if (options.exit_on_forward_failure)
1513: fatal("Could not request remote forwarding.");
1514: else
1515: logit("Warning: Could not request remote "
1516: "forwarding.");
1.366 markus 1517: } else {
1518: client_register_global_confirm(ssh_confirm_remote_forward,
1519: &options.remote_forwards[i]);
1.283 markus 1520: }
1.70 markus 1521: }
1.301 djm 1522:
1523: /* Initiate tunnel forwarding. */
1524: if (options.tun_open != SSH_TUNMODE_NO) {
1525: if (client_request_tun_fwd(options.tun_open,
1526: options.tun_local, options.tun_remote) == -1) {
1527: if (options.exit_on_forward_failure)
1528: fatal("Could not request tunnel forwarding.");
1529: else
1530: error("Could not request tunnel forwarding.");
1531: }
1532: }
1.70 markus 1533: }
1534:
1.126 itojun 1535: static void
1.70 markus 1536: check_agent_present(void)
1537: {
1.412 djm 1538: int r;
1539:
1.70 markus 1540: if (options.forward_agent) {
1.254 djm 1541: /* Clear agent forwarding if we don't have an agent. */
1.412 djm 1542: if ((r = ssh_get_authentication_socket(NULL)) != 0) {
1.70 markus 1543: options.forward_agent = 0;
1.412 djm 1544: if (r != SSH_ERR_AGENT_NOT_PRESENT)
1545: debug("ssh_get_authentication_socket: %s",
1546: ssh_err(r));
1547: }
1.70 markus 1548: }
1549: }
1550:
1.126 itojun 1551: static int
1.45 markus 1552: ssh_session(void)
1553: {
1554: int type;
1555: int interactive = 0;
1556: int have_tty = 0;
1557: struct winsize ws;
1558: char *cp;
1.243 djm 1559: const char *display;
1.45 markus 1560:
1.31 markus 1561: /* Enable compression if requested. */
1562: if (options.compression) {
1.316 djm 1563: debug("Requesting compression at level %d.",
1564: options.compression_level);
1.31 markus 1565:
1.316 djm 1566: if (options.compression_level < 1 ||
1567: options.compression_level > 9)
1568: fatal("Compression level must be from 1 (fast) to "
1569: "9 (slow, best).");
1.31 markus 1570:
1571: /* Send the request. */
1572: packet_start(SSH_CMSG_REQUEST_COMPRESSION);
1573: packet_put_int(options.compression_level);
1574: packet_send();
1575: packet_write_wait();
1.156 markus 1576: type = packet_read();
1.31 markus 1577: if (type == SSH_SMSG_SUCCESS)
1578: packet_start_compression(options.compression_level);
1579: else if (type == SSH_SMSG_FAILURE)
1.191 itojun 1580: logit("Warning: Remote host refused compression.");
1.31 markus 1581: else
1.316 djm 1582: packet_disconnect("Protocol error waiting for "
1583: "compression response.");
1.31 markus 1584: }
1585: /* Allocate a pseudo tty if appropriate. */
1586: if (tty_flag) {
1587: debug("Requesting pty.");
1588:
1589: /* Start the packet. */
1590: packet_start(SSH_CMSG_REQUEST_PTY);
1591:
1592: /* Store TERM in the packet. There is no limit on the
1593: length of the string. */
1594: cp = getenv("TERM");
1595: if (!cp)
1596: cp = "";
1.124 markus 1597: packet_put_cstring(cp);
1.31 markus 1598:
1599: /* Store window size in the packet. */
1600: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
1601: memset(&ws, 0, sizeof(ws));
1.269 deraadt 1602: packet_put_int((u_int)ws.ws_row);
1603: packet_put_int((u_int)ws.ws_col);
1604: packet_put_int((u_int)ws.ws_xpixel);
1605: packet_put_int((u_int)ws.ws_ypixel);
1.31 markus 1606:
1607: /* Store tty modes in the packet. */
1.115 stevesk 1608: tty_make_modes(fileno(stdin), NULL);
1.31 markus 1609:
1610: /* Send the packet, and wait for it to leave. */
1611: packet_send();
1612: packet_write_wait();
1613:
1614: /* Read response from the server. */
1.156 markus 1615: type = packet_read();
1.43 markus 1616: if (type == SSH_SMSG_SUCCESS) {
1.31 markus 1617: interactive = 1;
1.45 markus 1618: have_tty = 1;
1.43 markus 1619: } else if (type == SSH_SMSG_FAILURE)
1.316 djm 1620: logit("Warning: Remote host failed or refused to "
1621: "allocate a pseudo tty.");
1.31 markus 1622: else
1.316 djm 1623: packet_disconnect("Protocol error waiting for pty "
1624: "request response.");
1.31 markus 1625: }
1626: /* Request X11 forwarding if enabled and DISPLAY is set. */
1.243 djm 1627: display = getenv("DISPLAY");
1.417 djm 1628: if (display == NULL && options.forward_x11)
1629: debug("X11 forwarding requested but DISPLAY not set");
1.243 djm 1630: if (options.forward_x11 && display != NULL) {
1.150 stevesk 1631: char *proto, *data;
1.50 markus 1632: /* Get reasonable local authentication information. */
1.243 djm 1633: client_x11_get_proto(display, options.xauth_location,
1.384 djm 1634: options.forward_x11_trusted,
1.340 djm 1635: options.forward_x11_timeout,
1636: &proto, &data);
1.50 markus 1637: /* Request forwarding with authentication spoofing. */
1.316 djm 1638: debug("Requesting X11 forwarding with authentication "
1639: "spoofing.");
1.363 djm 1640: x11_request_forwarding_with_spoofing(0, display, proto,
1641: data, 0);
1.31 markus 1642: /* Read response from the server. */
1.156 markus 1643: type = packet_read();
1.31 markus 1644: if (type == SSH_SMSG_SUCCESS) {
1645: interactive = 1;
1.50 markus 1646: } else if (type == SSH_SMSG_FAILURE) {
1.191 itojun 1647: logit("Warning: Remote host denied X11 forwarding.");
1.50 markus 1648: } else {
1.316 djm 1649: packet_disconnect("Protocol error waiting for X11 "
1650: "forwarding");
1.50 markus 1651: }
1.31 markus 1652: }
1653: /* Tell the packet module whether this is an interactive session. */
1.354 djm 1654: packet_set_interactive(interactive,
1655: options.ip_qos_interactive, options.ip_qos_bulk);
1.31 markus 1656:
1657: /* Request authentication agent forwarding if appropriate. */
1.70 markus 1658: check_agent_present();
1659:
1.31 markus 1660: if (options.forward_agent) {
1661: debug("Requesting authentication agent forwarding.");
1662: auth_request_forwarding();
1663:
1664: /* Read response from the server. */
1.156 markus 1665: type = packet_read();
1.155 markus 1666: packet_check_eom();
1.31 markus 1667: if (type != SSH_SMSG_SUCCESS)
1.191 itojun 1668: logit("Warning: Remote host denied authentication agent forwarding.");
1.31 markus 1669: }
1670:
1.70 markus 1671: /* Initiate port forwardings. */
1.368 djm 1672: ssh_init_stdio_forwarding();
1.70 markus 1673: ssh_init_forwarding();
1.305 dtucker 1674:
1675: /* Execute a local command */
1676: if (options.local_command != NULL &&
1677: options.permit_local_command)
1678: ssh_local_cmd(options.local_command);
1.34 markus 1679:
1.318 djm 1680: /*
1681: * If requested and we are not interested in replies to remote
1682: * forwarding requests, then let ssh continue in the background.
1683: */
1.344 djm 1684: if (fork_after_authentication_flag) {
1685: if (options.exit_on_forward_failure &&
1686: options.num_remote_forwards > 0) {
1687: debug("deferring postauth fork until remote forward "
1688: "confirmation received");
1689: } else
1690: fork_postauth();
1.318 djm 1691: }
1.31 markus 1692:
1.33 markus 1693: /*
1694: * If a command was specified on the command line, execute the
1695: * command now. Otherwise request the server to start a shell.
1696: */
1.31 markus 1697: if (buffer_len(&command) > 0) {
1698: int len = buffer_len(&command);
1699: if (len > 900)
1700: len = 900;
1.316 djm 1701: debug("Sending command: %.*s", len,
1702: (u_char *)buffer_ptr(&command));
1.31 markus 1703: packet_start(SSH_CMSG_EXEC_CMD);
1704: packet_put_string(buffer_ptr(&command), buffer_len(&command));
1705: packet_send();
1706: packet_write_wait();
1707: } else {
1708: debug("Requesting shell.");
1709: packet_start(SSH_CMSG_EXEC_SHELL);
1710: packet_send();
1711: packet_write_wait();
1712: }
1713:
1714: /* Enter the interactive session. */
1.119 stevesk 1715: return client_loop(have_tty, tty_flag ?
1716: options.escape_char : SSH_ESCAPECHAR_NONE, 0);
1.89 markus 1717: }
1718:
1.214 djm 1719: /* request pty/x11/agent/tcpfwd/shell for channel */
1720: static void
1.337 djm 1721: ssh_session2_setup(int id, int success, void *arg)
1.214 djm 1722: {
1.215 djm 1723: extern char **environ;
1.243 djm 1724: const char *display;
1725: int interactive = tty_flag;
1.337 djm 1726:
1727: if (!success)
1728: return; /* No need for error message, channels code sens one */
1.215 djm 1729:
1.248 djm 1730: display = getenv("DISPLAY");
1.417 djm 1731: if (display == NULL && options.forward_x11)
1732: debug("X11 forwarding requested but DISPLAY not set");
1.243 djm 1733: if (options.forward_x11 && display != NULL) {
1.150 stevesk 1734: char *proto, *data;
1.50 markus 1735: /* Get reasonable local authentication information. */
1.243 djm 1736: client_x11_get_proto(display, options.xauth_location,
1.340 djm 1737: options.forward_x11_trusted,
1738: options.forward_x11_timeout, &proto, &data);
1.50 markus 1739: /* Request forwarding with authentication spoofing. */
1.316 djm 1740: debug("Requesting X11 forwarding with authentication "
1741: "spoofing.");
1.363 djm 1742: x11_request_forwarding_with_spoofing(id, display, proto,
1743: data, 1);
1744: client_expect_confirm(id, "X11 forwarding", CONFIRM_WARN);
1745: /* XXX exit_on_forward_failure */
1.80 markus 1746: interactive = 1;
1.50 markus 1747: }
1748:
1.70 markus 1749: check_agent_present();
1750: if (options.forward_agent) {
1751: debug("Requesting authentication agent forwarding.");
1752: channel_request_start(id, "auth-agent-req@openssh.com", 0);
1753: packet_send();
1.212 djm 1754: }
1.369 dtucker 1755:
1756: /* Tell the packet module whether this is an interactive session. */
1757: packet_set_interactive(interactive,
1758: options.ip_qos_interactive, options.ip_qos_bulk);
1.212 djm 1759:
1.214 djm 1760: client_session2_setup(id, tty_flag, subsystem_flag, getenv("TERM"),
1.311 djm 1761: NULL, fileno(stdin), &command, environ);
1.45 markus 1762: }
1763:
1.143 markus 1764: /* open new channel for a session */
1.126 itojun 1765: static int
1.143 markus 1766: ssh_session2_open(void)
1.45 markus 1767: {
1.118 markus 1768: Channel *c;
1769: int window, packetmax, in, out, err;
1.60 markus 1770:
1.62 markus 1771: if (stdin_null_flag) {
1.93 itojun 1772: in = open(_PATH_DEVNULL, O_RDONLY);
1.62 markus 1773: } else {
1774: in = dup(STDIN_FILENO);
1775: }
1.60 markus 1776: out = dup(STDOUT_FILENO);
1777: err = dup(STDERR_FILENO);
1.45 markus 1778:
1779: if (in < 0 || out < 0 || err < 0)
1.62 markus 1780: fatal("dup() in/out/err failed");
1.45 markus 1781:
1.69 markus 1782: /* enable nonblocking unless tty */
1783: if (!isatty(in))
1784: set_nonblock(in);
1785: if (!isatty(out))
1786: set_nonblock(out);
1787: if (!isatty(err))
1788: set_nonblock(err);
1789:
1.65 markus 1790: window = CHAN_SES_WINDOW_DEFAULT;
1791: packetmax = CHAN_SES_PACKET_DEFAULT;
1.164 markus 1792: if (tty_flag) {
1793: window >>= 1;
1794: packetmax >>= 1;
1.45 markus 1795: }
1.118 markus 1796: c = channel_new(
1.45 markus 1797: "session", SSH_CHANNEL_OPENING, in, out, err,
1.65 markus 1798: window, packetmax, CHAN_EXTENDED_WRITE,
1.192 markus 1799: "client-session", /*nonblock*/0);
1.45 markus 1800:
1.143 markus 1801: debug3("ssh_session2_open: channel_new: %d", c->self);
1.106 markus 1802:
1.122 markus 1803: channel_send_open(c->self);
1.143 markus 1804: if (!no_shell_flag)
1.310 djm 1805: channel_register_open_confirm(c->self,
1806: ssh_session2_setup, NULL);
1.106 markus 1807:
1.118 markus 1808: return c->self;
1.106 markus 1809: }
1810:
1.126 itojun 1811: static int
1.106 markus 1812: ssh_session2(void)
1813: {
1.143 markus 1814: int id = -1;
1.106 markus 1815:
1816: /* XXX should be pre-session */
1.368 djm 1817: if (!options.control_persist)
1818: ssh_init_stdio_forwarding();
1.106 markus 1819: ssh_init_forwarding();
1820:
1.344 djm 1821: /* Start listening for multiplex clients */
1822: muxserver_listen();
1823:
1824: /*
1.368 djm 1825: * If we are in control persist mode and have a working mux listen
1826: * socket, then prepare to background ourselves and have a foreground
1827: * client attach as a control slave.
1828: * NB. we must save copies of the flags that we override for
1.344 djm 1829: * the backgrounding, since we defer attachment of the slave until
1830: * after the connection is fully established (in particular,
1831: * async rfwd replies have been received for ExitOnForwardFailure).
1832: */
1833: if (options.control_persist && muxserver_sock != -1) {
1834: ostdin_null_flag = stdin_null_flag;
1835: ono_shell_flag = no_shell_flag;
1.359 djm 1836: orequest_tty = options.request_tty;
1.344 djm 1837: otty_flag = tty_flag;
1838: stdin_null_flag = 1;
1839: no_shell_flag = 1;
1840: tty_flag = 0;
1841: if (!fork_after_authentication_flag)
1842: need_controlpersist_detach = 1;
1843: fork_after_authentication_flag = 1;
1844: }
1.368 djm 1845: /*
1846: * ControlPersist mux listen socket setup failed, attempt the
1847: * stdio forward setup that we skipped earlier.
1848: */
1849: if (options.control_persist && muxserver_sock == -1)
1850: ssh_init_stdio_forwarding();
1.344 djm 1851:
1.143 markus 1852: if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN))
1853: id = ssh_session2_open();
1.379 djm 1854: else {
1855: packet_set_interactive(
1856: options.control_master == SSHCTL_MASTER_NO,
1857: options.ip_qos_interactive, options.ip_qos_bulk);
1858: }
1.314 djm 1859:
1860: /* If we don't expect to open a new session, then disallow it */
1.319 markus 1861: if (options.control_master == SSHCTL_MASTER_NO &&
1862: (datafellows & SSH_NEW_OPENSSH)) {
1.314 djm 1863: debug("Requesting no-more-sessions@openssh.com");
1864: packet_start(SSH2_MSG_GLOBAL_REQUEST);
1865: packet_put_cstring("no-more-sessions@openssh.com");
1866: packet_put_char(0);
1867: packet_send();
1868: }
1.255 reyk 1869:
1870: /* Execute a local command */
1871: if (options.local_command != NULL &&
1872: options.permit_local_command)
1873: ssh_local_cmd(options.local_command);
1.301 djm 1874:
1.342 djm 1875: /*
1876: * If requested and we are not interested in replies to remote
1877: * forwarding requests, then let ssh continue in the background.
1878: */
1.344 djm 1879: if (fork_after_authentication_flag) {
1880: if (options.exit_on_forward_failure &&
1881: options.num_remote_forwards > 0) {
1882: debug("deferring postauth fork until remote forward "
1883: "confirmation received");
1884: } else
1885: fork_postauth();
1.318 djm 1886: }
1.327 andreas 1887:
1888: if (options.use_roaming)
1889: request_roaming();
1.31 markus 1890:
1.119 stevesk 1891: return client_loop(tty_flag, tty_flag ?
1892: options.escape_char : SSH_ESCAPECHAR_NONE, id);
1.72 markus 1893: }
1894:
1.126 itojun 1895: static void
1.104 markus 1896: load_public_identity_files(void)
1897: {
1.275 djm 1898: char *filename, *cp, thishost[NI_MAXHOST];
1.306 deraadt 1899: char *pwdir = NULL, *pwname = NULL;
1.167 markus 1900: int i = 0;
1.104 markus 1901: Key *public;
1.275 djm 1902: struct passwd *pw;
1.335 djm 1903: u_int n_ids;
1904: char *identity_files[SSH_MAX_IDENTITY_FILES];
1905: Key *identity_keys[SSH_MAX_IDENTITY_FILES];
1.333 markus 1906: #ifdef ENABLE_PKCS11
1.167 markus 1907: Key **keys;
1.333 markus 1908: int nkeys;
1.335 djm 1909: #endif /* PKCS11 */
1.104 markus 1910:
1.335 djm 1911: n_ids = 0;
1.398 tedu 1912: memset(identity_files, 0, sizeof(identity_files));
1913: memset(identity_keys, 0, sizeof(identity_keys));
1.335 djm 1914:
1915: #ifdef ENABLE_PKCS11
1.333 markus 1916: if (options.pkcs11_provider != NULL &&
1.167 markus 1917: options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
1.333 markus 1918: (pkcs11_init(!options.batch_mode) == 0) &&
1919: (nkeys = pkcs11_add_provider(options.pkcs11_provider, NULL,
1920: &keys)) > 0) {
1921: for (i = 0; i < nkeys; i++) {
1.335 djm 1922: if (n_ids >= SSH_MAX_IDENTITY_FILES) {
1923: key_free(keys[i]);
1924: continue;
1925: }
1926: identity_keys[n_ids] = keys[i];
1927: identity_files[n_ids] =
1.333 markus 1928: xstrdup(options.pkcs11_provider); /* XXX */
1.335 djm 1929: n_ids++;
1.167 markus 1930: }
1.378 djm 1931: free(keys);
1.127 markus 1932: }
1.333 markus 1933: #endif /* ENABLE_PKCS11 */
1.275 djm 1934: if ((pw = getpwuid(original_real_uid)) == NULL)
1935: fatal("load_public_identity_files: getpwuid failed");
1.307 dtucker 1936: pwname = xstrdup(pw->pw_name);
1937: pwdir = xstrdup(pw->pw_dir);
1.275 djm 1938: if (gethostname(thishost, sizeof(thishost)) == -1)
1939: fatal("load_public_identity_files: gethostname: %s",
1940: strerror(errno));
1.335 djm 1941: for (i = 0; i < options.num_identity_files; i++) {
1.373 djm 1942: if (n_ids >= SSH_MAX_IDENTITY_FILES ||
1943: strcasecmp(options.identity_files[i], "none") == 0) {
1.378 djm 1944: free(options.identity_files[i]);
1.335 djm 1945: continue;
1946: }
1.275 djm 1947: cp = tilde_expand_filename(options.identity_files[i],
1.131 millert 1948: original_real_uid);
1.306 deraadt 1949: filename = percent_expand(cp, "d", pwdir,
1950: "u", pwname, "l", thishost, "h", host,
1.275 djm 1951: "r", options.user, (char *)NULL);
1.378 djm 1952: free(cp);
1.131 millert 1953: public = key_load_public(filename, NULL);
1954: debug("identity file %s type %d", filename,
1955: public ? public->type : -1);
1.378 djm 1956: free(options.identity_files[i]);
1.335 djm 1957: identity_files[n_ids] = filename;
1958: identity_keys[n_ids] = public;
1959:
1960: if (++n_ids >= SSH_MAX_IDENTITY_FILES)
1961: continue;
1962:
1963: /* Try to add the certificate variant too */
1964: xasprintf(&cp, "%s-cert", filename);
1965: public = key_load_public(cp, NULL);
1966: debug("identity file %s type %d", cp,
1967: public ? public->type : -1);
1968: if (public == NULL) {
1.378 djm 1969: free(cp);
1.335 djm 1970: continue;
1971: }
1972: if (!key_is_cert(public)) {
1973: debug("%s: key %s type %s is not a certificate",
1974: __func__, cp, key_type(public));
1975: key_free(public);
1.378 djm 1976: free(cp);
1.335 djm 1977: continue;
1978: }
1979: identity_keys[n_ids] = public;
1980: /* point to the original path, most likely the private key */
1981: identity_files[n_ids] = xstrdup(filename);
1982: n_ids++;
1983: }
1984: options.num_identity_files = n_ids;
1985: memcpy(options.identity_files, identity_files, sizeof(identity_files));
1986: memcpy(options.identity_keys, identity_keys, sizeof(identity_keys));
1987:
1.398 tedu 1988: explicit_bzero(pwname, strlen(pwname));
1.378 djm 1989: free(pwname);
1.398 tedu 1990: explicit_bzero(pwdir, strlen(pwdir));
1.378 djm 1991: free(pwdir);
1.214 djm 1992: }
1.352 djm 1993:
1994: static void
1995: main_sigchld_handler(int sig)
1996: {
1997: int save_errno = errno;
1998: pid_t pid;
1999: int status;
2000:
2001: while ((pid = waitpid(-1, &status, WNOHANG)) > 0 ||
2002: (pid < 0 && errno == EINTR))
2003: ;
2004:
2005: signal(sig, main_sigchld_handler);
2006: errno = save_errno;
2007: }
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