Annotation of src/usr.bin/ssh/ssh.c, Revision 1.497
1.497 ! djm 1: /* $OpenBSD: ssh.c,v 1.496 2018/11/23 05:08:07 djm Exp $ */
1.1 deraadt 2: /*
1.32 deraadt 3: * Author: Tatu Ylonen <ylo@cs.hut.fi>
4: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5: * All rights reserved
6: * Ssh client program. This program can be used to log into a remote machine.
7: * The software supports strong authentication, encryption, and forwarding
8: * of X11, TCP/IP, and authentication connections.
9: *
1.64 deraadt 10: * As far as I am concerned, the code I have written for this software
11: * can be used freely for any purpose. Any derived versions of this
12: * software must be clearly marked as such, and if the derived work is
13: * incompatible with the protocol description in the RFC file, it must be
14: * called by a name other than "ssh" or "Secure Shell".
15: *
16: * Copyright (c) 1999 Niels Provos. All rights reserved.
1.202 markus 17: * Copyright (c) 2000, 2001, 2002, 2003 Markus Friedl. All rights reserved.
1.64 deraadt 18: *
19: * Modified to work with SSL by Niels Provos <provos@citi.umich.edu>
20: * in Canada (German citizen).
21: *
22: * Redistribution and use in source and binary forms, with or without
23: * modification, are permitted provided that the following conditions
24: * are met:
25: * 1. Redistributions of source code must retain the above copyright
26: * notice, this list of conditions and the following disclaimer.
27: * 2. Redistributions in binary form must reproduce the above copyright
28: * notice, this list of conditions and the following disclaimer in the
29: * documentation and/or other materials provided with the distribution.
30: *
31: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
32: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
33: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
34: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
35: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
36: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
37: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
38: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
39: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
40: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.32 deraadt 41: */
1.1 deraadt 42:
1.293 deraadt 43: #include <sys/types.h>
1.312 djm 44: #include <sys/ioctl.h>
45: #include <sys/queue.h>
1.259 stevesk 46: #include <sys/resource.h>
1.280 stevesk 47: #include <sys/socket.h>
1.264 stevesk 48: #include <sys/stat.h>
1.312 djm 49: #include <sys/time.h>
1.352 djm 50: #include <sys/wait.h>
1.258 stevesk 51:
1.265 stevesk 52: #include <ctype.h>
1.285 stevesk 53: #include <errno.h>
1.281 stevesk 54: #include <fcntl.h>
1.286 stevesk 55: #include <netdb.h>
1.258 stevesk 56: #include <paths.h>
1.279 stevesk 57: #include <pwd.h>
1.263 stevesk 58: #include <signal.h>
1.287 stevesk 59: #include <stddef.h>
1.291 stevesk 60: #include <stdio.h>
1.290 stevesk 61: #include <stdlib.h>
1.289 stevesk 62: #include <string.h>
1.288 stevesk 63: #include <unistd.h>
1.414 deraadt 64: #include <limits.h>
1.445 djm 65: #include <locale.h>
1.49 markus 66:
1.402 markus 67: #ifdef WITH_OPENSSL
1.49 markus 68: #include <openssl/evp.h>
1.72 markus 69: #include <openssl/err.h>
1.402 markus 70: #endif
1.1 deraadt 71:
1.293 deraadt 72: #include "xmalloc.h"
1.84 markus 73: #include "ssh.h"
74: #include "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"
1.482 markus 80: #include "sshbuf.h"
1.123 markus 81: #include "channels.h"
1.483 markus 82: #include "sshkey.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"
1.278 stevesk 97: #include "version.h"
1.412 djm 98: #include "ssherr.h"
1.420 djm 99: #include "myproposal.h"
1.49 markus 100:
1.333 markus 101: #ifdef ENABLE_PKCS11
102: #include "ssh-pkcs11.h"
1.137 jakob 103: #endif
1.127 markus 104:
1.49 markus 105: extern char *__progname;
1.1 deraadt 106:
1.316 djm 107: /* Flag indicating whether debug mode is on. May be set on the command line. */
1.1 deraadt 108: int debug_flag = 0;
109:
1.359 djm 110: /* Flag indicating whether a tty should be requested */
1.1 deraadt 111: int tty_flag = 0;
112:
1.45 markus 113: /* don't exec a shell */
114: int no_shell_flag = 0;
115:
1.33 markus 116: /*
117: * Flag indicating that nothing should be read from stdin. This can be set
118: * on the command line.
119: */
1.1 deraadt 120: int stdin_null_flag = 0;
121:
1.33 markus 122: /*
1.344 djm 123: * Flag indicating that the current process should be backgrounded and
124: * a new slave launched in the foreground for ControlPersist.
125: */
126: int need_controlpersist_detach = 0;
127:
128: /* Copies of flags for ControlPersist foreground slave */
1.359 djm 129: int ostdin_null_flag, ono_shell_flag, otty_flag, orequest_tty;
1.344 djm 130:
131: /*
1.33 markus 132: * Flag indicating that ssh should fork after authentication. This is useful
1.172 deraadt 133: * so that the passphrase can be entered manually, and then ssh goes to the
1.33 markus 134: * background.
135: */
1.1 deraadt 136: int fork_after_authentication_flag = 0;
137:
1.33 markus 138: /*
139: * General data structure for command line options and options configurable
140: * in configuration files. See readconf.h.
141: */
1.1 deraadt 142: Options options;
143:
1.139 markus 144: /* optional user configfile */
145: char *config = NULL;
146:
1.33 markus 147: /*
148: * Name of the host we are connecting to. This is the name given on the
149: * command line, or the HostName specified for the user-supplied name in a
150: * configuration file.
151: */
1.1 deraadt 152: char *host;
153:
1.466 djm 154: /* Various strings used to to percent_expand() arguments */
155: static char thishost[NI_MAXHOST], shorthost[NI_MAXHOST], portstr[NI_MAXSERV];
156: static char uidstr[32], *host_arg, *conn_hash_hex;
157:
1.22 provos 158: /* socket address the host resolves to */
1.37 markus 159: struct sockaddr_storage hostaddr;
1.1 deraadt 160:
1.112 markus 161: /* Private host keys. */
1.173 markus 162: Sensitive sensitive_data;
1.1 deraadt 163:
1.45 markus 164: /* command to be executed */
1.482 markus 165: struct sshbuf *command;
1.45 markus 166:
1.85 djm 167: /* Should we execute a command or invoke a subsystem? */
168: int subsystem_flag = 0;
169:
1.170 markus 170: /* # of replies received for global requests */
1.315 djm 171: static int remote_forward_confirms_received = 0;
1.170 markus 172:
1.313 djm 173: /* mux.c */
174: extern int muxserver_sock;
175: extern u_int muxclient_command;
176:
1.1 deraadt 177: /* Prints a help message to the user. This function never returns. */
178:
1.126 itojun 179: static void
1.93 itojun 180: usage(void)
1.1 deraadt 181: {
1.208 markus 182: fprintf(stderr,
1.474 djm 183: "usage: ssh [-46AaCfGgKkMNnqsTtVvXxYy] [-B bind_interface]\n"
184: " [-b bind_address] [-c cipher_spec] [-D [bind_address:]port]\n"
185: " [-E log_file] [-e escape_char] [-F configfile] [-I pkcs11]\n"
186: " [-i identity_file] [-J [user@]host[:port]] [-L address]\n"
187: " [-l login_name] [-m mac_spec] [-O ctl_cmd] [-o option] [-p port]\n"
188: " [-Q query_option] [-R address] [-S ctl_path] [-W host:port]\n"
189: " [-w local_tun[:remote_tun]] destination [command]\n"
1.208 markus 190: );
1.257 dtucker 191: exit(255);
1.1 deraadt 192: }
193:
1.466 djm 194: static int ssh_session2(struct ssh *, struct passwd *);
195: static void load_public_identity_files(struct passwd *);
1.352 djm 196: static void main_sigchld_handler(int);
1.312 djm 197:
1.361 djm 198: /* ~/ expand a list of paths. NB. assumes path[n] is heap-allocated. */
199: static void
200: tilde_expand_paths(char **paths, u_int num_paths)
201: {
202: u_int i;
203: char *cp;
204:
205: for (i = 0; i < num_paths; i++) {
1.490 dtucker 206: cp = tilde_expand_filename(paths[i], getuid());
1.378 djm 207: free(paths[i]);
1.361 djm 208: paths[i] = cp;
209: }
210: }
211:
1.400 djm 212: /*
213: * Attempt to resolve a host name / port to a set of addresses and
214: * optionally return any CNAMEs encountered along the way.
215: * Returns NULL on failure.
216: * NB. this function must operate with a options having undefined members.
217: */
1.385 djm 218: static struct addrinfo *
1.400 djm 219: resolve_host(const char *name, int port, int logerr, char *cname, size_t clen)
1.385 djm 220: {
221: char strport[NI_MAXSERV];
222: struct addrinfo hints, *res;
223: int gaierr, loglevel = SYSLOG_LEVEL_DEBUG1;
224:
1.400 djm 225: if (port <= 0)
226: port = default_ssh_port();
227:
1.427 djm 228: snprintf(strport, sizeof strport, "%d", port);
1.398 tedu 229: memset(&hints, 0, sizeof(hints));
1.400 djm 230: hints.ai_family = options.address_family == -1 ?
231: AF_UNSPEC : options.address_family;
1.385 djm 232: hints.ai_socktype = SOCK_STREAM;
233: if (cname != NULL)
234: hints.ai_flags = AI_CANONNAME;
235: if ((gaierr = getaddrinfo(name, strport, &hints, &res)) != 0) {
236: if (logerr || (gaierr != EAI_NONAME && gaierr != EAI_NODATA))
237: loglevel = SYSLOG_LEVEL_ERROR;
238: do_log2(loglevel, "%s: Could not resolve hostname %.100s: %s",
239: __progname, name, ssh_gai_strerror(gaierr));
240: return NULL;
241: }
242: if (cname != NULL && res->ai_canonname != NULL) {
243: if (strlcpy(cname, res->ai_canonname, clen) >= clen) {
244: error("%s: host \"%s\" cname \"%s\" too long (max %lu)",
245: __func__, name, res->ai_canonname, (u_long)clen);
246: if (clen > 0)
247: *cname = '\0';
248: }
249: }
250: return res;
251: }
252:
1.470 djm 253: /* Returns non-zero if name can only be an address and not a hostname */
254: static int
255: is_addr_fast(const char *name)
256: {
257: return (strchr(name, '%') != NULL || strchr(name, ':') != NULL ||
258: strspn(name, "0123456789.") == strlen(name));
259: }
260:
261: /* Returns non-zero if name represents a valid, single address */
262: static int
263: is_addr(const char *name)
264: {
265: char strport[NI_MAXSERV];
266: struct addrinfo hints, *res;
267:
268: if (is_addr_fast(name))
269: return 1;
270:
271: snprintf(strport, sizeof strport, "%u", default_ssh_port());
272: memset(&hints, 0, sizeof(hints));
273: hints.ai_family = options.address_family == -1 ?
274: AF_UNSPEC : options.address_family;
275: hints.ai_socktype = SOCK_STREAM;
276: hints.ai_flags = AI_NUMERICHOST|AI_NUMERICSERV;
277: if (getaddrinfo(name, strport, &hints, &res) != 0)
278: return 0;
279: if (res == NULL || res->ai_next != NULL) {
280: freeaddrinfo(res);
281: return 0;
282: }
283: freeaddrinfo(res);
284: return 1;
285: }
286:
1.385 djm 287: /*
1.413 djm 288: * Attempt to resolve a numeric host address / port to a single address.
289: * Returns a canonical address string.
290: * Returns NULL on failure.
291: * NB. this function must operate with a options having undefined members.
292: */
293: static struct addrinfo *
294: resolve_addr(const char *name, int port, char *caddr, size_t clen)
295: {
296: char addr[NI_MAXHOST], strport[NI_MAXSERV];
297: struct addrinfo hints, *res;
298: int gaierr;
299:
300: if (port <= 0)
301: port = default_ssh_port();
302: snprintf(strport, sizeof strport, "%u", port);
303: memset(&hints, 0, sizeof(hints));
304: hints.ai_family = options.address_family == -1 ?
305: AF_UNSPEC : options.address_family;
306: hints.ai_socktype = SOCK_STREAM;
307: hints.ai_flags = AI_NUMERICHOST|AI_NUMERICSERV;
308: if ((gaierr = getaddrinfo(name, strport, &hints, &res)) != 0) {
309: debug2("%s: could not resolve name %.100s as address: %s",
310: __func__, name, ssh_gai_strerror(gaierr));
311: return NULL;
312: }
313: if (res == NULL) {
314: debug("%s: getaddrinfo %.100s returned no addresses",
315: __func__, name);
316: return NULL;
317: }
318: if (res->ai_next != NULL) {
319: debug("%s: getaddrinfo %.100s returned multiple addresses",
320: __func__, name);
321: goto fail;
322: }
323: if ((gaierr = getnameinfo(res->ai_addr, res->ai_addrlen,
324: addr, sizeof(addr), NULL, 0, NI_NUMERICHOST)) != 0) {
325: debug("%s: Could not format address for name %.100s: %s",
326: __func__, name, ssh_gai_strerror(gaierr));
327: goto fail;
328: }
329: if (strlcpy(caddr, addr, clen) >= clen) {
330: error("%s: host \"%s\" addr \"%s\" too long (max %lu)",
331: __func__, name, addr, (u_long)clen);
332: if (clen > 0)
333: *caddr = '\0';
334: fail:
335: freeaddrinfo(res);
336: return NULL;
337: }
338: return res;
339: }
340:
341: /*
1.385 djm 342: * Check whether the cname is a permitted replacement for the hostname
343: * and perform the replacement if it is.
1.400 djm 344: * NB. this function must operate with a options having undefined members.
1.385 djm 345: */
346: static int
1.443 djm 347: check_follow_cname(int direct, char **namep, const char *cname)
1.385 djm 348: {
349: int i;
350: struct allowed_cname *rule;
351:
352: if (*cname == '\0' || options.num_permitted_cnames == 0 ||
353: strcmp(*namep, cname) == 0)
354: return 0;
1.386 djm 355: if (options.canonicalize_hostname == SSH_CANONICALISE_NO)
1.385 djm 356: return 0;
357: /*
1.386 djm 358: * Don't attempt to canonicalize names that will be interpreted by
1.443 djm 359: * a proxy or jump host unless the user specifically requests so.
1.385 djm 360: */
1.443 djm 361: if (!direct &&
1.386 djm 362: options.canonicalize_hostname != SSH_CANONICALISE_ALWAYS)
1.385 djm 363: return 0;
364: debug3("%s: check \"%s\" CNAME \"%s\"", __func__, *namep, cname);
365: for (i = 0; i < options.num_permitted_cnames; i++) {
366: rule = options.permitted_cnames + i;
1.418 djm 367: if (match_pattern_list(*namep, rule->source_list, 1) != 1 ||
368: match_pattern_list(cname, rule->target_list, 1) != 1)
1.385 djm 369: continue;
1.386 djm 370: verbose("Canonicalized DNS aliased hostname "
1.385 djm 371: "\"%s\" => \"%s\"", *namep, cname);
372: free(*namep);
373: *namep = xstrdup(cname);
374: return 1;
375: }
376: return 0;
377: }
378:
379: /*
380: * Attempt to resolve the supplied hostname after applying the user's
1.387 djm 381: * canonicalization rules. Returns the address list for the host or NULL
382: * if no name was found after canonicalization.
1.400 djm 383: * NB. this function must operate with a options having undefined members.
1.385 djm 384: */
385: static struct addrinfo *
1.400 djm 386: resolve_canonicalize(char **hostp, int port)
1.385 djm 387: {
1.443 djm 388: int i, direct, ndots;
1.413 djm 389: char *cp, *fullhost, newname[NI_MAXHOST];
1.385 djm 390: struct addrinfo *addrs;
391:
392: /*
1.470 djm 393: * Attempt to canonicalise addresses, regardless of
394: * whether hostname canonicalisation was requested
1.385 djm 395: */
1.413 djm 396: if ((addrs = resolve_addr(*hostp, port,
397: newname, sizeof(newname))) != NULL) {
398: debug2("%s: hostname %.100s is address", __func__, *hostp);
399: if (strcasecmp(*hostp, newname) != 0) {
400: debug2("%s: canonicalised address \"%s\" => \"%s\"",
401: __func__, *hostp, newname);
402: free(*hostp);
403: *hostp = xstrdup(newname);
404: }
405: return addrs;
406: }
407:
1.470 djm 408: /*
409: * If this looks like an address but didn't parse as one, it might
410: * be an address with an invalid interface scope. Skip further
411: * attempts at canonicalisation.
412: */
413: if (is_addr_fast(*hostp)) {
414: debug("%s: hostname %.100s is an unrecognised address",
415: __func__, *hostp);
416: return NULL;
417: }
418:
419: if (options.canonicalize_hostname == SSH_CANONICALISE_NO)
420: return NULL;
421:
422: /*
423: * Don't attempt to canonicalize names that will be interpreted by
424: * a proxy unless the user specifically requests so.
425: */
426: direct = option_clear_or_none(options.proxy_command) &&
427: options.jump_host == NULL;
428: if (!direct &&
429: options.canonicalize_hostname != SSH_CANONICALISE_ALWAYS)
430: return NULL;
431:
1.428 djm 432: /* If domain name is anchored, then resolve it now */
433: if ((*hostp)[strlen(*hostp) - 1] == '.') {
434: debug3("%s: name is fully qualified", __func__);
435: fullhost = xstrdup(*hostp);
436: if ((addrs = resolve_host(fullhost, port, 0,
437: newname, sizeof(newname))) != NULL)
438: goto found;
439: free(fullhost);
440: goto notfound;
441: }
442:
1.387 djm 443: /* Don't apply canonicalization to sufficiently-qualified hostnames */
1.385 djm 444: ndots = 0;
445: for (cp = *hostp; *cp != '\0'; cp++) {
446: if (*cp == '.')
447: ndots++;
448: }
1.386 djm 449: if (ndots > options.canonicalize_max_dots) {
450: debug3("%s: not canonicalizing hostname \"%s\" (max dots %d)",
451: __func__, *hostp, options.canonicalize_max_dots);
1.385 djm 452: return NULL;
453: }
454: /* Attempt each supplied suffix */
455: for (i = 0; i < options.num_canonical_domains; i++) {
1.413 djm 456: *newname = '\0';
1.385 djm 457: xasprintf(&fullhost, "%s.%s.", *hostp,
458: options.canonical_domains[i]);
1.400 djm 459: debug3("%s: attempting \"%s\" => \"%s\"", __func__,
460: *hostp, fullhost);
461: if ((addrs = resolve_host(fullhost, port, 0,
1.413 djm 462: newname, sizeof(newname))) == NULL) {
1.385 djm 463: free(fullhost);
464: continue;
465: }
1.428 djm 466: found:
1.385 djm 467: /* Remove trailing '.' */
468: fullhost[strlen(fullhost) - 1] = '\0';
469: /* Follow CNAME if requested */
1.443 djm 470: if (!check_follow_cname(direct, &fullhost, newname)) {
1.386 djm 471: debug("Canonicalized hostname \"%s\" => \"%s\"",
1.385 djm 472: *hostp, fullhost);
473: }
474: free(*hostp);
475: *hostp = fullhost;
476: return addrs;
477: }
1.428 djm 478: notfound:
1.386 djm 479: if (!options.canonicalize_fallback_local)
1.400 djm 480: fatal("%s: Could not resolve host \"%s\"", __progname, *hostp);
481: debug2("%s: host %s not found in any suffix", __func__, *hostp);
1.385 djm 482: return NULL;
483: }
484:
1.32 deraadt 485: /*
1.483 markus 486: * Check the result of hostkey loading, ignoring some errors and
487: * fatal()ing for others.
488: */
489: static void
490: check_load(int r, const char *path, const char *message)
491: {
492: switch (r) {
493: case 0:
494: break;
495: case SSH_ERR_INTERNAL_ERROR:
496: case SSH_ERR_ALLOC_FAIL:
497: fatal("load %s \"%s\": %s", message, path, ssh_err(r));
498: case SSH_ERR_SYSTEM_ERROR:
499: /* Ignore missing files */
500: if (errno == ENOENT)
501: break;
502: /* FALLTHROUGH */
503: default:
504: error("load %s \"%s\": %s", message, path, ssh_err(r));
505: break;
506: }
507: }
508:
509: /*
1.400 djm 510: * Read per-user configuration file. Ignore the system wide config
511: * file if the user specifies a config file on the command line.
512: */
513: static void
1.496 djm 514: process_config_files(const char *host_name, struct passwd *pw, int final_pass,
515: int *want_final_pass)
1.400 djm 516: {
1.414 deraadt 517: char buf[PATH_MAX];
1.400 djm 518: int r;
519:
520: if (config != NULL) {
521: if (strcasecmp(config, "none") != 0 &&
1.466 djm 522: !read_config_file(config, pw, host, host_name, &options,
1.496 djm 523: SSHCONF_USERCONF | (final_pass ? SSHCONF_FINAL : 0),
524: want_final_pass))
1.400 djm 525: fatal("Can't open user config file %.100s: "
526: "%.100s", config, strerror(errno));
527: } else {
528: r = snprintf(buf, sizeof buf, "%s/%s", pw->pw_dir,
529: _PATH_SSH_USER_CONFFILE);
530: if (r > 0 && (size_t)r < sizeof(buf))
1.466 djm 531: (void)read_config_file(buf, pw, host, host_name,
1.408 djm 532: &options, SSHCONF_CHECKPERM | SSHCONF_USERCONF |
1.496 djm 533: (final_pass ? SSHCONF_FINAL : 0), want_final_pass);
1.400 djm 534:
535: /* Read systemwide configuration file after user config. */
1.408 djm 536: (void)read_config_file(_PATH_HOST_CONFIG_FILE, pw,
1.466 djm 537: host, host_name, &options,
1.496 djm 538: final_pass ? SSHCONF_FINAL : 0, want_final_pass);
1.408 djm 539: }
540: }
541:
542: /* Rewrite the port number in an addrinfo list of addresses */
543: static void
544: set_addrinfo_port(struct addrinfo *addrs, int port)
545: {
546: struct addrinfo *addr;
547:
548: for (addr = addrs; addr != NULL; addr = addr->ai_next) {
549: switch (addr->ai_family) {
550: case AF_INET:
551: ((struct sockaddr_in *)addr->ai_addr)->
552: sin_port = htons(port);
553: break;
554: case AF_INET6:
555: ((struct sockaddr_in6 *)addr->ai_addr)->
556: sin6_port = htons(port);
557: break;
558: }
1.400 djm 559: }
560: }
561:
562: /*
1.32 deraadt 563: * Main program for the ssh client.
564: */
1.2 provos 565: int
566: main(int ac, char **av)
1.1 deraadt 567: {
1.437 djm 568: struct ssh *ssh = NULL;
1.462 djm 569: int i, r, opt, exit_status, use_syslog, direct, timeout_ms;
1.496 djm 570: int was_addr, config_test = 0, opt_terminated = 0, want_final_pass = 0;
1.466 djm 571: char *p, *cp, *line, *argv0, buf[PATH_MAX], *logfile;
572: char cname[NI_MAXHOST];
1.31 markus 573: struct stat st;
1.98 markus 574: struct passwd *pw;
1.144 stevesk 575: extern int optind, optreset;
576: extern char *optarg;
1.406 millert 577: struct Forward fwd;
1.385 djm 578: struct addrinfo *addrs = NULL;
1.405 djm 579: struct ssh_digest_ctx *md;
580: u_char conn_hash[SSH_DIGEST_MAX_LENGTH];
1.250 djm 581:
1.436 dtucker 582: ssh_malloc_init(); /* must be called before any mallocs */
1.250 djm 583: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
584: sanitise_stdfd();
1.31 markus 585:
1.33 markus 586: /*
1.346 djm 587: * Discard other fds that are hanging around. These can cause problem
588: * with backgrounded ssh processes started by ControlPersist.
589: */
590: closefrom(STDERR_FILENO + 1);
591:
1.487 dtucker 592: if (getuid() != geteuid())
593: fatal("ssh setuid not supported.");
594: if (getgid() != getegid())
595: fatal("ssh setgid not supported.");
1.184 stevesk 596:
1.107 markus 597: /* Get user data. */
1.490 dtucker 598: pw = getpwuid(getuid());
1.107 markus 599: if (!pw) {
1.490 dtucker 600: logit("No user exists for uid %lu", (u_long)getuid());
1.257 dtucker 601: exit(255);
1.107 markus 602: }
603: /* Take a copy of the returned structure. */
604: pw = pwcopy(pw);
1.31 markus 605:
1.33 markus 606: /*
607: * Set our umask to something reasonable, as some files are created
608: * with the default umask. This will make them world-readable but
609: * writable only by the owner, which is ok for all files for which we
610: * don't set the modes explicitly.
611: */
1.31 markus 612: umask(022);
1.445 djm 613:
614: setlocale(LC_CTYPE, "");
1.31 markus 615:
1.316 djm 616: /*
617: * Initialize option structure to indicate that no values have been
618: * set.
619: */
1.31 markus 620: initialize_options(&options);
621:
1.463 djm 622: /*
623: * Prepare main ssh transport/connection structures
624: */
625: if ((ssh = ssh_alloc_session_state()) == NULL)
626: fatal("Couldn't allocate session state");
627: channel_init_channels(ssh);
628: active_state = ssh; /* XXX legacy API compat */
629:
1.31 markus 630: /* Parse command-line arguments. */
631: host = NULL;
1.320 djm 632: use_syslog = 0;
1.375 dtucker 633: logfile = NULL;
1.325 markus 634: argv0 = av[0];
1.31 markus 635:
1.266 djm 636: again:
1.316 djm 637: while ((opt = getopt(ac, av, "1246ab:c:e:fgi:kl:m:no:p:qstvx"
1.474 djm 638: "AB:CD:E:F:GI:J:KL:MNO:PQ:R:S:TVw:W:XYy")) != -1) {
1.31 markus 639: switch (opt) {
1.91 jakob 640: case '1':
1.454 djm 641: fatal("SSH protocol v.1 is no longer supported");
1.91 jakob 642: break;
1.47 markus 643: case '2':
1.454 djm 644: /* Ignored */
1.47 markus 645: break;
1.37 markus 646: case '4':
1.196 djm 647: options.address_family = AF_INET;
1.37 markus 648: break;
649: case '6':
1.196 djm 650: options.address_family = AF_INET6;
1.37 markus 651: break;
1.31 markus 652: case 'n':
653: stdin_null_flag = 1;
654: break;
655: case 'f':
656: fork_after_authentication_flag = 1;
657: stdin_null_flag = 1;
658: break;
659: case 'x':
660: options.forward_x11 = 0;
661: break;
662: case 'X':
663: options.forward_x11 = 1;
664: break;
1.320 djm 665: case 'y':
666: use_syslog = 1;
667: break;
1.375 dtucker 668: case 'E':
1.422 dtucker 669: logfile = optarg;
1.375 dtucker 670: break;
1.408 djm 671: case 'G':
672: config_test = 1;
673: break;
1.202 markus 674: case 'Y':
675: options.forward_x11 = 1;
676: options.forward_x11_trusted = 1;
677: break;
1.31 markus 678: case 'g':
1.406 millert 679: options.fwd_opts.gateway_ports = 1;
1.31 markus 680: break;
1.229 djm 681: case 'O':
1.441 dtucker 682: if (options.stdio_forward_host != NULL)
1.332 djm 683: fatal("Cannot specify multiplexing "
684: "command with -W");
685: else if (muxclient_command != 0)
686: fatal("Multiplexing command already specified");
1.229 djm 687: if (strcmp(optarg, "check") == 0)
1.312 djm 688: muxclient_command = SSHMUX_COMMAND_ALIVE_CHECK;
1.338 markus 689: else if (strcmp(optarg, "forward") == 0)
690: muxclient_command = SSHMUX_COMMAND_FORWARD;
1.229 djm 691: else if (strcmp(optarg, "exit") == 0)
1.312 djm 692: muxclient_command = SSHMUX_COMMAND_TERMINATE;
1.357 djm 693: else if (strcmp(optarg, "stop") == 0)
694: muxclient_command = SSHMUX_COMMAND_STOP;
1.365 djm 695: else if (strcmp(optarg, "cancel") == 0)
696: muxclient_command = SSHMUX_COMMAND_CANCEL_FWD;
1.447 markus 697: else if (strcmp(optarg, "proxy") == 0)
698: muxclient_command = SSHMUX_COMMAND_PROXY;
1.229 djm 699: else
700: fatal("Invalid multiplex command.");
701: break;
1.183 stevesk 702: case 'P': /* deprecated */
1.376 djm 703: break;
1.394 deraadt 704: case 'Q':
1.376 djm 705: cp = NULL;
1.394 deraadt 706: if (strcmp(optarg, "cipher") == 0)
1.393 djm 707: cp = cipher_alg_list('\n', 0);
1.394 deraadt 708: else if (strcmp(optarg, "cipher-auth") == 0)
1.393 djm 709: cp = cipher_alg_list('\n', 1);
1.394 deraadt 710: else if (strcmp(optarg, "mac") == 0)
1.392 dtucker 711: cp = mac_alg_list('\n');
1.394 deraadt 712: else if (strcmp(optarg, "kex") == 0)
1.392 dtucker 713: cp = kex_alg_list('\n');
1.394 deraadt 714: else if (strcmp(optarg, "key") == 0)
1.451 djm 715: cp = sshkey_alg_list(0, 0, 0, '\n');
1.396 markus 716: else if (strcmp(optarg, "key-cert") == 0)
1.451 djm 717: cp = sshkey_alg_list(1, 0, 0, '\n');
1.396 markus 718: else if (strcmp(optarg, "key-plain") == 0)
1.451 djm 719: cp = sshkey_alg_list(0, 1, 0, '\n');
1.491 djm 720: else if (strcmp(optarg, "sig") == 0)
1.492 djm 721: cp = sshkey_alg_list(0, 1, 1, '\n');
1.491 djm 722: else if (strcmp(optarg, "protocol-version") == 0)
1.416 djm 723: cp = xstrdup("2");
1.491 djm 724: else if (strcmp(optarg, "help") == 0) {
725: cp = xstrdup(
726: "cipher\ncipher-auth\nkex\nkey\n"
727: "key-cert\nkey-plain\nmac\n"
728: "protocol-version\nsig");
1.416 djm 729: }
1.376 djm 730: if (cp == NULL)
731: fatal("Unsupported query \"%s\"", optarg);
732: printf("%s\n", cp);
733: free(cp);
734: exit(0);
1.31 markus 735: break;
736: case 'a':
737: options.forward_agent = 0;
1.53 markus 738: break;
739: case 'A':
740: options.forward_agent = 1;
1.31 markus 741: break;
742: case 'k':
1.204 dtucker 743: options.gss_deleg_creds = 0;
1.297 djm 744: break;
745: case 'K':
746: options.gss_authentication = 1;
747: options.gss_deleg_creds = 1;
1.31 markus 748: break;
749: case 'i':
1.490 dtucker 750: p = tilde_expand_filename(optarg, getuid());
1.429 dtucker 751: if (stat(p, &st) < 0)
1.128 fgsch 752: fprintf(stderr, "Warning: Identity file %s "
1.429 dtucker 753: "not accessible: %s.\n", p,
1.231 otto 754: strerror(errno));
1.429 dtucker 755: else
756: add_identity_file(&options, NULL, p, 1);
757: free(p);
1.31 markus 758: break;
1.127 markus 759: case 'I':
1.333 markus 760: #ifdef ENABLE_PKCS11
1.422 dtucker 761: free(options.pkcs11_provider);
1.333 markus 762: options.pkcs11_provider = xstrdup(optarg);
1.137 jakob 763: #else
1.333 markus 764: fprintf(stderr, "no support for PKCS#11.\n");
1.137 jakob 765: #endif
1.127 markus 766: break;
1.443 djm 767: case 'J':
768: if (options.jump_host != NULL)
769: fatal("Only a single -J option permitted");
770: if (options.proxy_command != NULL)
771: fatal("Cannot specify -J with ProxyCommand");
772: if (parse_jump(optarg, &options, 1) == -1)
773: fatal("Invalid -J argument");
774: options.proxy_command = xstrdup("none");
775: break;
1.31 markus 776: case 't':
1.359 djm 777: if (options.request_tty == REQUEST_TTY_YES)
778: options.request_tty = REQUEST_TTY_FORCE;
779: else
780: options.request_tty = REQUEST_TTY_YES;
1.31 markus 781: break;
782: case 'v':
1.197 markus 783: if (debug_flag == 0) {
1.66 markus 784: debug_flag = 1;
785: options.log_level = SYSLOG_LEVEL_DEBUG1;
1.197 markus 786: } else {
1.443 djm 787: if (options.log_level < SYSLOG_LEVEL_DEBUG3) {
788: debug_flag++;
1.197 markus 789: options.log_level++;
1.443 djm 790: }
1.197 markus 791: }
1.375 dtucker 792: break;
1.31 markus 793: case 'V':
1.209 markus 794: fprintf(stderr, "%s, %s\n",
1.402 markus 795: SSH_VERSION,
796: #ifdef WITH_OPENSSL
1.495 djm 797: OpenSSL_version(OPENSSL_VERSION)
1.402 markus 798: #else
799: "without OpenSSL"
800: #endif
801: );
1.31 markus 802: if (opt == 'V')
803: exit(0);
804: break;
1.255 reyk 805: case 'w':
1.256 reyk 806: if (options.tun_open == -1)
807: options.tun_open = SSH_TUNMODE_DEFAULT;
1.255 reyk 808: options.tun_local = a2tun(optarg, &options.tun_remote);
1.256 reyk 809: if (options.tun_local == SSH_TUNID_ERR) {
1.316 djm 810: fprintf(stderr,
811: "Bad tun device '%s'\n", optarg);
1.257 dtucker 812: exit(255);
1.255 reyk 813: }
814: break;
1.331 dtucker 815: case 'W':
1.441 dtucker 816: if (options.stdio_forward_host != NULL)
1.332 djm 817: fatal("stdio forward already specified");
818: if (muxclient_command != 0)
819: fatal("Cannot specify stdio forward with -O");
1.331 dtucker 820: if (parse_forward(&fwd, optarg, 1, 0)) {
1.441 dtucker 821: options.stdio_forward_host = fwd.listen_host;
822: options.stdio_forward_port = fwd.listen_port;
1.378 djm 823: free(fwd.connect_host);
1.331 dtucker 824: } else {
825: fprintf(stderr,
826: "Bad stdio forwarding specification '%s'\n",
827: optarg);
828: exit(255);
829: }
1.359 djm 830: options.request_tty = REQUEST_TTY_NO;
1.331 dtucker 831: no_shell_flag = 1;
832: break;
1.31 markus 833: case 'q':
834: options.log_level = SYSLOG_LEVEL_QUIET;
835: break;
836: case 'e':
837: if (optarg[0] == '^' && optarg[2] == 0 &&
1.128 fgsch 838: (u_char) optarg[1] >= 64 &&
839: (u_char) optarg[1] < 128)
1.78 markus 840: options.escape_char = (u_char) optarg[1] & 31;
1.31 markus 841: else if (strlen(optarg) == 1)
1.78 markus 842: options.escape_char = (u_char) optarg[0];
1.31 markus 843: else if (strcmp(optarg, "none") == 0)
1.119 stevesk 844: options.escape_char = SSH_ESCAPECHAR_NONE;
1.31 markus 845: else {
1.128 fgsch 846: fprintf(stderr, "Bad escape character '%s'.\n",
847: optarg);
1.257 dtucker 848: exit(255);
1.31 markus 849: }
850: break;
851: case 'c':
1.456 djm 852: if (!ciphers_valid(*optarg == '+' ?
1.420 djm 853: optarg + 1 : optarg)) {
854: fprintf(stderr, "Unknown cipher type '%s'\n",
855: optarg);
856: exit(255);
1.95 markus 857: }
1.456 djm 858: free(options.ciphers);
859: options.ciphers = xstrdup(optarg);
1.95 markus 860: break;
861: case 'm':
1.422 dtucker 862: if (mac_valid(optarg)) {
863: free(options.macs);
1.95 markus 864: options.macs = xstrdup(optarg);
1.422 dtucker 865: } else {
1.128 fgsch 866: fprintf(stderr, "Unknown mac type '%s'\n",
867: optarg);
1.257 dtucker 868: exit(255);
1.31 markus 869: }
870: break;
1.214 djm 871: case 'M':
1.242 djm 872: if (options.control_master == SSHCTL_MASTER_YES)
873: options.control_master = SSHCTL_MASTER_ASK;
874: else
875: options.control_master = SSHCTL_MASTER_YES;
1.214 djm 876: break;
1.31 markus 877: case 'p':
1.465 millert 878: if (options.port == -1) {
879: options.port = a2port(optarg);
880: if (options.port <= 0) {
881: fprintf(stderr, "Bad port '%s'\n",
882: optarg);
883: exit(255);
884: }
1.109 markus 885: }
1.31 markus 886: break;
887: case 'l':
1.465 millert 888: if (options.user == NULL)
889: options.user = optarg;
1.31 markus 890: break;
1.141 stevesk 891:
892: case 'L':
1.324 djm 893: if (parse_forward(&fwd, optarg, 0, 0))
1.232 djm 894: add_local_forward(&options, &fwd);
895: else {
1.128 fgsch 896: fprintf(stderr,
1.232 djm 897: "Bad local forwarding specification '%s'\n",
1.128 fgsch 898: optarg);
1.257 dtucker 899: exit(255);
1.31 markus 900: }
1.232 djm 901: break;
902:
903: case 'R':
1.464 markus 904: if (parse_forward(&fwd, optarg, 0, 1) ||
905: parse_forward(&fwd, optarg, 1, 1)) {
1.232 djm 906: add_remote_forward(&options, &fwd);
907: } else {
1.128 fgsch 908: fprintf(stderr,
1.232 djm 909: "Bad remote forwarding specification "
910: "'%s'\n", optarg);
1.257 dtucker 911: exit(255);
1.31 markus 912: }
913: break;
1.108 markus 914:
915: case 'D':
1.324 djm 916: if (parse_forward(&fwd, optarg, 1, 0)) {
1.322 stevesk 917: add_local_forward(&options, &fwd);
1.232 djm 918: } else {
1.322 stevesk 919: fprintf(stderr,
920: "Bad dynamic forwarding specification "
921: "'%s'\n", optarg);
1.257 dtucker 922: exit(255);
1.109 markus 923: }
1.108 markus 924: break;
925:
1.31 markus 926: case 'C':
927: options.compression = 1;
928: break;
1.45 markus 929: case 'N':
930: no_shell_flag = 1;
1.359 djm 931: options.request_tty = REQUEST_TTY_NO;
1.45 markus 932: break;
933: case 'T':
1.359 djm 934: options.request_tty = REQUEST_TTY_NO;
1.45 markus 935: break;
1.31 markus 936: case 'o':
1.205 markus 937: line = xstrdup(optarg);
1.408 djm 938: if (process_config_line(&options, pw,
939: host ? host : "", host ? host : "", line,
940: "command-line", 0, NULL, SSHCONF_USERCONF) != 0)
1.257 dtucker 941: exit(255);
1.378 djm 942: free(line);
1.31 markus 943: break;
1.85 djm 944: case 's':
945: subsystem_flag = 1;
1.117 markus 946: break;
1.214 djm 947: case 'S':
1.431 mmcc 948: free(options.control_path);
1.214 djm 949: options.control_path = xstrdup(optarg);
950: break;
1.117 markus 951: case 'b':
952: options.bind_address = optarg;
1.474 djm 953: break;
954: case 'B':
955: options.bind_interface = optarg;
1.85 djm 956: break;
1.139 markus 957: case 'F':
958: config = optarg;
959: break;
1.31 markus 960: default:
961: usage();
1.1 deraadt 962: }
1.31 markus 963: }
964:
1.462 djm 965: if (optind > 1 && strcmp(av[optind - 1], "--") == 0)
966: opt_terminated = 1;
967:
1.128 fgsch 968: ac -= optind;
969: av += optind;
970:
1.329 guenther 971: if (ac > 0 && !host) {
1.465 millert 972: int tport;
973: char *tuser;
974: switch (parse_ssh_uri(*av, &tuser, &host, &tport)) {
975: case -1:
976: usage();
977: break;
978: case 0:
979: if (options.user == NULL) {
980: options.user = tuser;
981: tuser = NULL;
982: }
983: free(tuser);
984: if (options.port == -1 && tport != -1)
985: options.port = tport;
986: break;
987: default:
1.128 fgsch 988: p = xstrdup(*av);
1.188 markus 989: cp = strrchr(p, '@');
1.465 millert 990: if (cp != NULL) {
991: if (cp == p)
992: usage();
993: if (options.user == NULL) {
994: options.user = p;
995: p = NULL;
996: }
997: *cp++ = '\0';
998: host = xstrdup(cp);
999: free(p);
1000: } else
1001: host = p;
1002: break;
1003: }
1.462 djm 1004: if (ac > 1 && !opt_terminated) {
1.189 millert 1005: optind = optreset = 1;
1.128 fgsch 1006: goto again;
1007: }
1.189 millert 1008: ac--, av++;
1.128 fgsch 1009: }
1010:
1.31 markus 1011: /* Check that we got a host name. */
1012: if (!host)
1013: usage();
1014:
1.385 djm 1015: host_arg = xstrdup(host);
1016:
1.402 markus 1017: #ifdef WITH_OPENSSL
1.350 djm 1018: OpenSSL_add_all_algorithms();
1.72 markus 1019: ERR_load_crypto_strings();
1.402 markus 1020: #endif
1.31 markus 1021:
1022: /* Initialize the command to execute on remote host. */
1.482 markus 1023: if ((command = sshbuf_new()) == NULL)
1024: fatal("sshbuf_new failed");
1.1 deraadt 1025:
1.33 markus 1026: /*
1027: * Save the command to execute on the remote host in a buffer. There
1028: * is no limit on the length of the command, except by the maximum
1029: * packet size. Also sets the tty flag if there is no command.
1030: */
1.128 fgsch 1031: if (!ac) {
1.31 markus 1032: /* No command specified - execute shell on a tty. */
1.85 djm 1033: if (subsystem_flag) {
1.128 fgsch 1034: fprintf(stderr,
1035: "You must specify a subsystem to invoke.\n");
1.85 djm 1036: usage();
1037: }
1.31 markus 1038: } else {
1.128 fgsch 1039: /* A command has been specified. Store it into the buffer. */
1040: for (i = 0; i < ac; i++) {
1.482 markus 1041: if ((r = sshbuf_putf(command, "%s%s",
1042: i ? " " : "", av[i])) != 0)
1043: fatal("%s: buffer error: %s",
1044: __func__, ssh_err(r));
1.31 markus 1045: }
1046: }
1047:
1.101 markus 1048: /*
1049: * Initialize "log" output. Since we are the client all output
1.375 dtucker 1050: * goes to stderr unless otherwise specified by -y or -E.
1.101 markus 1051: */
1.375 dtucker 1052: if (use_syslog && logfile != NULL)
1053: fatal("Can't specify both -y and -E");
1.422 dtucker 1054: if (logfile != NULL)
1.375 dtucker 1055: log_redirect_stderr_to(logfile);
1.325 markus 1056: log_init(argv0,
1.468 djm 1057: options.log_level == SYSLOG_LEVEL_NOT_SET ?
1.452 dtucker 1058: SYSLOG_LEVEL_INFO : options.log_level,
1.468 djm 1059: options.log_facility == SYSLOG_FACILITY_NOT_SET ?
1.452 dtucker 1060: SYSLOG_FACILITY_USER : options.log_facility,
1061: !use_syslog);
1.375 dtucker 1062:
1063: if (debug_flag)
1.402 markus 1064: logit("%s, %s", SSH_VERSION,
1065: #ifdef WITH_OPENSSL
1.495 djm 1066: OpenSSL_version(OPENSSL_VERSION)
1.402 markus 1067: #else
1068: "without OpenSSL"
1069: #endif
1070: );
1.31 markus 1071:
1.400 djm 1072: /* Parse the configuration files */
1.496 djm 1073: process_config_files(host_arg, pw, 0, &want_final_pass);
1074: if (want_final_pass)
1075: debug("configuration requests final Match pass");
1.400 djm 1076:
1077: /* Hostname canonicalisation needs a few options filled. */
1078: fill_default_options_for_canonicalization(&options);
1079:
1080: /* If the user has replaced the hostname then take it into use now */
1081: if (options.hostname != NULL) {
1082: /* NB. Please keep in sync with readconf.c:match_cfg_line() */
1083: cp = percent_expand(options.hostname,
1084: "h", host, (char *)NULL);
1085: free(host);
1086: host = cp;
1.408 djm 1087: free(options.hostname);
1088: options.hostname = xstrdup(host);
1.400 djm 1089: }
1090:
1.470 djm 1091: /* Don't lowercase addresses, they will be explicitly canonicalised */
1092: if ((was_addr = is_addr(host)) == 0)
1093: lowercase(host);
1094:
1095: /*
1096: * Try to canonicalize if requested by configuration or the
1097: * hostname is an address.
1098: */
1099: if (options.canonicalize_hostname != SSH_CANONICALISE_NO || was_addr)
1.400 djm 1100: addrs = resolve_canonicalize(&host, options.port);
1101:
1.139 markus 1102: /*
1.401 djm 1103: * If CanonicalizePermittedCNAMEs have been specified but
1104: * other canonicalization did not happen (by not being requested
1105: * or by failing with fallback) then the hostname may still be changed
1.468 djm 1106: * as a result of CNAME following.
1.401 djm 1107: *
1108: * Try to resolve the bare hostname name using the system resolver's
1109: * usual search rules and then apply the CNAME follow rules.
1110: *
1111: * Skip the lookup if a ProxyCommand is being used unless the user
1112: * has specifically requested canonicalisation for this case via
1113: * CanonicalizeHostname=always
1.139 markus 1114: */
1.443 djm 1115: direct = option_clear_or_none(options.proxy_command) &&
1116: options.jump_host == NULL;
1117: if (addrs == NULL && options.num_permitted_cnames != 0 && (direct ||
1118: options.canonicalize_hostname == SSH_CANONICALISE_ALWAYS)) {
1.403 djm 1119: if ((addrs = resolve_host(host, options.port,
1.493 djm 1120: direct, cname, sizeof(cname))) == NULL) {
1.403 djm 1121: /* Don't fatal proxied host names not in the DNS */
1.493 djm 1122: if (direct)
1.403 djm 1123: cleanup_exit(255); /* logged in resolve_host */
1124: } else
1.443 djm 1125: check_follow_cname(direct, &host, cname);
1.400 djm 1126: }
1.139 markus 1127:
1.400 djm 1128: /*
1.408 djm 1129: * If canonicalisation is enabled then re-parse the configuration
1130: * files as new stanzas may match.
1.400 djm 1131: */
1.496 djm 1132: if (options.canonicalize_hostname != 0 && !want_final_pass) {
1133: debug("hostname canonicalisation enabled, "
1134: "will re-parse configuration");
1135: want_final_pass = 1;
1136: }
1137:
1138: if (want_final_pass) {
1139: debug("re-parsing configuration");
1.408 djm 1140: free(options.hostname);
1141: options.hostname = xstrdup(host);
1.496 djm 1142: process_config_files(host_arg, pw, 1, NULL);
1.408 djm 1143: /*
1144: * Address resolution happens early with canonicalisation
1145: * enabled and the port number may have changed since, so
1146: * reset it in address list
1147: */
1148: if (addrs != NULL && options.port > 0)
1149: set_addrinfo_port(addrs, options.port);
1.139 markus 1150: }
1.31 markus 1151:
1152: /* Fill configuration defaults. */
1153: fill_default_options(&options);
1.443 djm 1154:
1155: /*
1156: * If ProxyJump option specified, then construct a ProxyCommand now.
1157: */
1158: if (options.jump_host != NULL) {
1159: char port_s[8];
1.478 djm 1160: const char *sshbin = argv0;
1161:
1162: /*
1163: * Try to use SSH indicated by argv[0], but fall back to
1164: * "ssh" if it appears unavailable.
1165: */
1166: if (strchr(argv0, '/') != NULL && access(argv0, X_OK) != 0)
1167: sshbin = "ssh";
1.443 djm 1168:
1169: /* Consistency check */
1170: if (options.proxy_command != NULL)
1171: fatal("inconsistent options: ProxyCommand+ProxyJump");
1172: /* Never use FD passing for ProxyJump */
1173: options.proxy_use_fdpass = 0;
1174: snprintf(port_s, sizeof(port_s), "%d", options.jump_port);
1175: xasprintf(&options.proxy_command,
1.478 djm 1176: "%s%s%s%s%s%s%s%s%s%s%.*s -W '[%%h]:%%p' %s",
1177: sshbin,
1.443 djm 1178: /* Optional "-l user" argument if jump_user set */
1179: options.jump_user == NULL ? "" : " -l ",
1180: options.jump_user == NULL ? "" : options.jump_user,
1181: /* Optional "-p port" argument if jump_port set */
1182: options.jump_port <= 0 ? "" : " -p ",
1183: options.jump_port <= 0 ? "" : port_s,
1184: /* Optional additional jump hosts ",..." */
1185: options.jump_extra == NULL ? "" : " -J ",
1186: options.jump_extra == NULL ? "" : options.jump_extra,
1187: /* Optional "-F" argumment if -F specified */
1188: config == NULL ? "" : " -F ",
1189: config == NULL ? "" : config,
1190: /* Optional "-v" arguments if -v set */
1191: debug_flag ? " -" : "",
1192: debug_flag, "vvv",
1193: /* Mandatory hostname */
1194: options.jump_host);
1195: debug("Setting implicit ProxyCommand from ProxyJump: %s",
1196: options.proxy_command);
1197: }
1.31 markus 1198:
1.400 djm 1199: if (options.port == 0)
1200: options.port = default_ssh_port();
1.463 djm 1201: channel_set_af(ssh, options.address_family);
1.196 djm 1202:
1.383 djm 1203: /* Tidy and check options */
1204: if (options.host_key_alias != NULL)
1205: lowercase(options.host_key_alias);
1206: if (options.proxy_command != NULL &&
1207: strcmp(options.proxy_command, "-") == 0 &&
1208: options.proxy_use_fdpass)
1209: fatal("ProxyCommand=- and ProxyUseFDPass are incompatible");
1.415 djm 1210: if (options.control_persist &&
1211: options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK) {
1212: debug("UpdateHostKeys=ask is incompatible with ControlPersist; "
1213: "disabling");
1214: options.update_hostkeys = 0;
1215: }
1.430 djm 1216: if (options.connection_attempts <= 0)
1217: fatal("Invalid number of ConnectionAttempts");
1218:
1.482 markus 1219: if (sshbuf_len(command) != 0 && options.remote_command != NULL)
1.461 bluhm 1220: fatal("Cannot execute command-line and remote command.");
1221:
1222: /* Cannot fork to background if no command. */
1.482 markus 1223: if (fork_after_authentication_flag && sshbuf_len(command) == 0 &&
1.461 bluhm 1224: options.remote_command == NULL && !no_shell_flag)
1225: fatal("Cannot fork into background without a command "
1226: "to execute.");
1227:
1.31 markus 1228: /* reinit */
1.452 dtucker 1229: log_init(argv0, options.log_level, options.log_facility, !use_syslog);
1.370 djm 1230:
1231: if (options.request_tty == REQUEST_TTY_YES ||
1232: options.request_tty == REQUEST_TTY_FORCE)
1233: tty_flag = 1;
1234:
1235: /* Allocate a tty by default if no command specified. */
1.482 markus 1236: if (sshbuf_len(command) == 0 && options.remote_command == NULL)
1.370 djm 1237: tty_flag = options.request_tty != REQUEST_TTY_NO;
1238:
1239: /* Force no tty */
1.447 markus 1240: if (options.request_tty == REQUEST_TTY_NO ||
1241: (muxclient_command && muxclient_command != SSHMUX_COMMAND_PROXY))
1.370 djm 1242: tty_flag = 0;
1243: /* Do not allocate a tty if stdin is not a tty. */
1244: if ((!isatty(fileno(stdin)) || stdin_null_flag) &&
1245: options.request_tty != REQUEST_TTY_FORCE) {
1246: if (tty_flag)
1247: logit("Pseudo-terminal will not be allocated because "
1248: "stdin is not a terminal.");
1249: tty_flag = 0;
1250: }
1.31 markus 1251:
1252: if (options.user == NULL)
1253: options.user = xstrdup(pw->pw_name);
1.343 djm 1254:
1.466 djm 1255: /* Set up strings used to percent_expand() arguments */
1.358 djm 1256: if (gethostname(thishost, sizeof(thishost)) == -1)
1257: fatal("gethostname: %s", strerror(errno));
1258: strlcpy(shorthost, thishost, sizeof(shorthost));
1259: shorthost[strcspn(thishost, ".")] = '\0';
1260: snprintf(portstr, sizeof(portstr), "%d", options.port);
1.479 djm 1261: snprintf(uidstr, sizeof(uidstr), "%llu",
1262: (unsigned long long)pw->pw_uid);
1.358 djm 1263:
1.405 djm 1264: if ((md = ssh_digest_start(SSH_DIGEST_SHA1)) == NULL ||
1265: ssh_digest_update(md, thishost, strlen(thishost)) < 0 ||
1266: ssh_digest_update(md, host, strlen(host)) < 0 ||
1267: ssh_digest_update(md, portstr, strlen(portstr)) < 0 ||
1268: ssh_digest_update(md, options.user, strlen(options.user)) < 0 ||
1269: ssh_digest_final(md, conn_hash, sizeof(conn_hash)) < 0)
1270: fatal("%s: mux digest failed", __func__);
1271: ssh_digest_free(md);
1272: conn_hash_hex = tohex(conn_hash, ssh_digest_bytes(SSH_DIGEST_SHA1));
1273:
1.466 djm 1274: /*
1275: * Expand tokens in arguments. NB. LocalCommand is expanded later,
1276: * after port-forwarding is set up, so it may pick up any local
1277: * tunnel interface name allocated.
1278: */
1.461 bluhm 1279: if (options.remote_command != NULL) {
1280: debug3("expanding RemoteCommand: %s", options.remote_command);
1281: cp = options.remote_command;
1282: options.remote_command = percent_expand(cp,
1283: "C", conn_hash_hex,
1284: "L", shorthost,
1285: "d", pw->pw_dir,
1286: "h", host,
1.479 djm 1287: "i", uidstr,
1.461 bluhm 1288: "l", thishost,
1289: "n", host_arg,
1290: "p", portstr,
1291: "r", options.user,
1292: "u", pw->pw_name,
1293: (char *)NULL);
1294: debug3("expanded RemoteCommand: %s", options.remote_command);
1295: free(cp);
1.482 markus 1296: if ((r = sshbuf_put(command, options.remote_command,
1297: strlen(options.remote_command))) != 0)
1298: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.304 dtucker 1299: }
1.31 markus 1300:
1.214 djm 1301: if (options.control_path != NULL) {
1.490 dtucker 1302: cp = tilde_expand_filename(options.control_path, getuid());
1.378 djm 1303: free(options.control_path);
1.405 djm 1304: options.control_path = percent_expand(cp,
1305: "C", conn_hash_hex,
1306: "L", shorthost,
1307: "h", host,
1.479 djm 1308: "i", uidstr,
1.405 djm 1309: "l", thishost,
1310: "n", host_arg,
1311: "p", portstr,
1312: "r", options.user,
1313: "u", pw->pw_name,
1.423 djm 1314: "i", uidstr,
1.358 djm 1315: (char *)NULL);
1.378 djm 1316: free(cp);
1.214 djm 1317: }
1.408 djm 1318:
1319: if (config_test) {
1320: dump_client_config(&options, host);
1321: exit(0);
1322: }
1.405 djm 1323:
1.312 djm 1324: if (muxclient_command != 0 && options.control_path == NULL)
1.240 djm 1325: fatal("No ControlPath specified for \"-O\" command");
1.447 markus 1326: if (options.control_path != NULL) {
1327: int sock;
1328: if ((sock = muxclient(options.control_path)) >= 0) {
1.463 djm 1329: ssh_packet_set_connection(ssh, sock, sock);
1.447 markus 1330: packet_set_mux();
1331: goto skip_connect;
1332: }
1333: }
1.401 djm 1334:
1335: /*
1336: * If hostname canonicalisation was not enabled, then we may not
1337: * have yet resolved the hostname. Do so now.
1338: */
1339: if (addrs == NULL && options.proxy_command == NULL) {
1.421 djm 1340: debug2("resolving \"%s\" port %d", host, options.port);
1.401 djm 1341: if ((addrs = resolve_host(host, options.port, 1,
1342: cname, sizeof(cname))) == NULL)
1343: cleanup_exit(255); /* resolve_host logs the error */
1344: }
1.214 djm 1345:
1.303 djm 1346: timeout_ms = options.connection_timeout * 1000;
1347:
1.77 markus 1348: /* Open a connection to the remote host. */
1.463 djm 1349: if (ssh_connect(ssh, host, addrs, &hostaddr, options.port,
1.385 djm 1350: options.address_family, options.connection_attempts,
1.488 dtucker 1351: &timeout_ms, options.tcp_keep_alive) != 0)
1.257 dtucker 1352: exit(255);
1.31 markus 1353:
1.391 djm 1354: if (addrs != NULL)
1355: freeaddrinfo(addrs);
1356:
1.385 djm 1357: packet_set_timeout(options.server_alive_interval,
1358: options.server_alive_count_max);
1359:
1.437 djm 1360: ssh = active_state; /* XXX */
1361:
1.303 djm 1362: if (timeout_ms > 0)
1363: debug3("timeout: %d ms remain after connect", timeout_ms);
1364:
1.33 markus 1365: /*
1.485 dtucker 1366: * If we successfully made the connection and we have hostbased auth
1367: * enabled, load the public keys so we can later use the ssh-keysign
1368: * helper to sign challenges.
1.33 markus 1369: */
1.112 markus 1370: sensitive_data.nkeys = 0;
1371: sensitive_data.keys = NULL;
1.457 djm 1372: if (options.hostbased_authentication) {
1.486 dtucker 1373: sensitive_data.nkeys = 10;
1.274 deraadt 1374: sensitive_data.keys = xcalloc(sensitive_data.nkeys,
1.483 markus 1375: sizeof(struct sshkey));
1376:
1377: /* XXX check errors? */
1.486 dtucker 1378: #define L_PUBKEY(p,o) do { \
1379: if ((o) >= sensitive_data.nkeys) \
1380: fatal("%s pubkey out of array bounds", __func__); \
1.483 markus 1381: check_load(sshkey_load_public(p, &(sensitive_data.keys[o]), NULL), \
1.486 dtucker 1382: p, "pubkey"); \
1383: } while (0)
1384: #define L_CERT(p,o) do { \
1385: if ((o) >= sensitive_data.nkeys) \
1386: fatal("%s cert out of array bounds", __func__); \
1387: check_load(sshkey_load_cert(p, &(sensitive_data.keys[o])), p, "cert"); \
1388: } while (0)
1.177 markus 1389:
1.485 dtucker 1390: if (options.hostbased_authentication == 1) {
1.486 dtucker 1391: L_CERT(_PATH_HOST_ECDSA_KEY_FILE, 0);
1392: L_CERT(_PATH_HOST_ED25519_KEY_FILE, 1);
1393: L_CERT(_PATH_HOST_RSA_KEY_FILE, 2);
1394: L_CERT(_PATH_HOST_DSA_KEY_FILE, 3);
1395: L_PUBKEY(_PATH_HOST_ECDSA_KEY_FILE, 4);
1396: L_PUBKEY(_PATH_HOST_ED25519_KEY_FILE, 5);
1397: L_PUBKEY(_PATH_HOST_RSA_KEY_FILE, 6);
1398: L_PUBKEY(_PATH_HOST_DSA_KEY_FILE, 7);
1399: L_CERT(_PATH_HOST_XMSS_KEY_FILE, 8);
1400: L_PUBKEY(_PATH_HOST_XMSS_KEY_FILE, 9);
1.173 markus 1401: }
1.31 markus 1402: }
1403:
1.487 dtucker 1404: /* Create ~/.ssh * directory if it doesn't already exist. */
1.367 djm 1405: if (config == NULL) {
1406: r = snprintf(buf, sizeof buf, "%s%s%s", pw->pw_dir,
1407: strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR);
1408: if (r > 0 && (size_t)r < sizeof(buf) && stat(buf, &st) < 0)
1409: if (mkdir(buf, 0700) < 0)
1410: error("Could not create directory '%.200s'.",
1411: buf);
1412: }
1.31 markus 1413:
1.104 markus 1414: /* load options.identity_files */
1.466 djm 1415: load_public_identity_files(pw);
1.439 markus 1416:
1.476 djm 1417: /* optionally set the SSH_AUTHSOCKET_ENV_NAME variable */
1.440 markus 1418: if (options.identity_agent &&
1419: strcmp(options.identity_agent, SSH_AUTHSOCKET_ENV_NAME) != 0) {
1.439 markus 1420: if (strcmp(options.identity_agent, "none") == 0) {
1421: unsetenv(SSH_AUTHSOCKET_ENV_NAME);
1422: } else {
1423: p = tilde_expand_filename(options.identity_agent,
1.490 dtucker 1424: getuid());
1.479 djm 1425: cp = percent_expand(p,
1426: "d", pw->pw_dir,
1427: "h", host,
1428: "i", uidstr,
1429: "l", thishost,
1430: "r", options.user,
1431: "u", pw->pw_name,
1432: (char *)NULL);
1.494 djm 1433: free(p);
1434: /*
1435: * If identity_agent represents an environment variable
1436: * then recheck that it is valid (since processing with
1437: * percent_expand() may have changed it) and substitute
1438: * its value.
1439: */
1440: if (cp[0] == '$') {
1441: if (!valid_env_name(cp + 1)) {
1442: fatal("Invalid IdentityAgent "
1443: "environment variable name %s", cp);
1444: }
1445: if ((p = getenv(cp + 1)) == NULL)
1446: unsetenv(SSH_AUTHSOCKET_ENV_NAME);
1447: else
1448: setenv(SSH_AUTHSOCKET_ENV_NAME, p, 1);
1449: } else {
1450: /* identity_agent specifies a path directly */
1451: setenv(SSH_AUTHSOCKET_ENV_NAME, cp, 1);
1452: }
1.439 markus 1453: free(cp);
1454: }
1455: }
1.104 markus 1456:
1457: /* Expand ~ in known host file names. */
1.361 djm 1458: tilde_expand_paths(options.system_hostfiles,
1459: options.num_system_hostfiles);
1460: tilde_expand_paths(options.user_hostfiles, options.num_user_hostfiles);
1.149 markus 1461:
1462: signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
1.352 djm 1463: signal(SIGCHLD, main_sigchld_handler);
1.31 markus 1464:
1.316 djm 1465: /* Log into the remote system. Never returns if the login fails. */
1.497 ! djm 1466: ssh_login(ssh, &sensitive_data, host, (struct sockaddr *)&hostaddr,
1.355 djm 1467: options.port, pw, timeout_ms);
1.339 djm 1468:
1469: if (packet_connection_is_on_socket()) {
1470: verbose("Authenticated to %s ([%s]:%d).", host,
1.437 djm 1471: ssh_remote_ipaddr(ssh), ssh_remote_port(ssh));
1.339 djm 1472: } else {
1473: verbose("Authenticated to %s (via proxy).", host);
1474: }
1.31 markus 1475:
1.112 markus 1476: /* We no longer need the private host keys. Clear them now. */
1477: if (sensitive_data.nkeys != 0) {
1478: for (i = 0; i < sensitive_data.nkeys; i++) {
1479: if (sensitive_data.keys[i] != NULL) {
1480: /* Destroys contents safely */
1481: debug3("clear hostkey %d", i);
1.483 markus 1482: sshkey_free(sensitive_data.keys[i]);
1.112 markus 1483: sensitive_data.keys[i] = NULL;
1484: }
1485: }
1.378 djm 1486: free(sensitive_data.keys);
1.134 markus 1487: }
1488: for (i = 0; i < options.num_identity_files; i++) {
1.378 djm 1489: free(options.identity_files[i]);
1490: options.identity_files[i] = NULL;
1.134 markus 1491: if (options.identity_keys[i]) {
1.483 markus 1492: sshkey_free(options.identity_keys[i]);
1.134 markus 1493: options.identity_keys[i] = NULL;
1494: }
1.112 markus 1495: }
1.426 djm 1496: for (i = 0; i < options.num_certificate_files; i++) {
1497: free(options.certificate_files[i]);
1498: options.certificate_files[i] = NULL;
1499: }
1.31 markus 1500:
1.447 markus 1501: skip_connect:
1.466 djm 1502: exit_status = ssh_session2(ssh, pw);
1.45 markus 1503: packet_close();
1.186 djm 1504:
1.312 djm 1505: if (options.control_path != NULL && muxserver_sock != -1)
1.214 djm 1506: unlink(options.control_path);
1507:
1.353 djm 1508: /* Kill ProxyCommand if it is running. */
1509: ssh_kill_proxy_command();
1.186 djm 1510:
1.45 markus 1511: return exit_status;
1512: }
1513:
1.344 djm 1514: static void
1515: control_persist_detach(void)
1516: {
1517: pid_t pid;
1.438 djm 1518: int devnull, keep_stderr;
1.344 djm 1519:
1520: debug("%s: backgrounding master process", __func__);
1521:
1.473 djm 1522: /*
1523: * master (current process) into the background, and make the
1524: * foreground process a client of the backgrounded master.
1525: */
1.344 djm 1526: switch ((pid = fork())) {
1527: case -1:
1528: fatal("%s: fork: %s", __func__, strerror(errno));
1529: case 0:
1530: /* Child: master process continues mainloop */
1.473 djm 1531: break;
1532: default:
1.344 djm 1533: /* Parent: set up mux slave to connect to backgrounded master */
1534: debug2("%s: background process is %ld", __func__, (long)pid);
1535: stdin_null_flag = ostdin_null_flag;
1.359 djm 1536: options.request_tty = orequest_tty;
1.344 djm 1537: tty_flag = otty_flag;
1.473 djm 1538: close(muxserver_sock);
1539: muxserver_sock = -1;
1.351 markus 1540: options.control_master = SSHCTL_MASTER_NO;
1.473 djm 1541: muxclient(options.control_path);
1.344 djm 1542: /* muxclient() doesn't return on success. */
1.473 djm 1543: fatal("Failed to connect to new control master");
1544: }
1.346 djm 1545: if ((devnull = open(_PATH_DEVNULL, O_RDWR)) == -1) {
1546: error("%s: open(\"/dev/null\"): %s", __func__,
1547: strerror(errno));
1548: } else {
1.438 djm 1549: keep_stderr = log_is_on_stderr() && debug_flag;
1.346 djm 1550: if (dup2(devnull, STDIN_FILENO) == -1 ||
1.438 djm 1551: dup2(devnull, STDOUT_FILENO) == -1 ||
1552: (!keep_stderr && dup2(devnull, STDERR_FILENO) == -1))
1.346 djm 1553: error("%s: dup2: %s", __func__, strerror(errno));
1554: if (devnull > STDERR_FILENO)
1555: close(devnull);
1556: }
1.381 djm 1557: daemon(1, 1);
1.362 djm 1558: setproctitle("%s [mux]", options.control_path);
1.344 djm 1559: }
1560:
1561: /* Do fork() after authentication. Used by "ssh -f" */
1562: static void
1563: fork_postauth(void)
1564: {
1565: if (need_controlpersist_detach)
1566: control_persist_detach();
1567: debug("forking to background");
1568: fork_after_authentication_flag = 0;
1569: if (daemon(1, 1) < 0)
1570: fatal("daemon() failed: %.200s", strerror(errno));
1571: }
1572:
1.315 djm 1573: /* Callback for remote forward global requests */
1574: static void
1.463 djm 1575: ssh_confirm_remote_forward(struct ssh *ssh, int type, u_int32_t seq, void *ctxt)
1.315 djm 1576: {
1.406 millert 1577: struct Forward *rfwd = (struct Forward *)ctxt;
1.315 djm 1578:
1.324 djm 1579: /* XXX verbose() on failure? */
1.404 markus 1580: debug("remote forward %s for: listen %s%s%d, connect %s:%d",
1.315 djm 1581: type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
1.406 millert 1582: rfwd->listen_path ? rfwd->listen_path :
1583: rfwd->listen_host ? rfwd->listen_host : "",
1584: (rfwd->listen_path || rfwd->listen_host) ? ":" : "",
1585: rfwd->listen_port, rfwd->connect_path ? rfwd->connect_path :
1586: rfwd->connect_host, rfwd->connect_port);
1587: if (rfwd->listen_path == NULL && rfwd->listen_port == 0) {
1.366 markus 1588: if (type == SSH2_MSG_REQUEST_SUCCESS) {
1589: rfwd->allocated_port = packet_get_int();
1590: logit("Allocated port %u for remote forward to %s:%d",
1591: rfwd->allocated_port,
1592: rfwd->connect_host, rfwd->connect_port);
1.480 djm 1593: channel_update_permission(ssh,
1.463 djm 1594: rfwd->handle, rfwd->allocated_port);
1.366 markus 1595: } else {
1.480 djm 1596: channel_update_permission(ssh, rfwd->handle, -1);
1.366 markus 1597: }
1.324 djm 1598: }
1.468 djm 1599:
1.315 djm 1600: if (type == SSH2_MSG_REQUEST_FAILURE) {
1.406 millert 1601: if (options.exit_on_forward_failure) {
1602: if (rfwd->listen_path != NULL)
1603: fatal("Error: remote port forwarding failed "
1604: "for listen path %s", rfwd->listen_path);
1605: else
1606: fatal("Error: remote port forwarding failed "
1607: "for listen port %d", rfwd->listen_port);
1608: } else {
1609: if (rfwd->listen_path != NULL)
1610: logit("Warning: remote port forwarding failed "
1611: "for listen path %s", rfwd->listen_path);
1612: else
1613: logit("Warning: remote port forwarding failed "
1614: "for listen port %d", rfwd->listen_port);
1615: }
1.315 djm 1616: }
1.318 djm 1617: if (++remote_forward_confirms_received == options.num_remote_forwards) {
1.315 djm 1618: debug("All remote forwarding requests processed");
1.344 djm 1619: if (fork_after_authentication_flag)
1620: fork_postauth();
1.318 djm 1621: }
1.315 djm 1622: }
1623:
1.126 itojun 1624: static void
1.463 djm 1625: client_cleanup_stdio_fwd(struct ssh *ssh, int id, void *arg)
1.331 dtucker 1626: {
1627: debug("stdio forwarding: done");
1628: cleanup_exit(0);
1629: }
1630:
1.368 djm 1631: static void
1.463 djm 1632: ssh_stdio_confirm(struct ssh *ssh, int id, int success, void *arg)
1.407 djm 1633: {
1634: if (!success)
1635: fatal("stdio forwarding failed");
1636: }
1637:
1638: static void
1.463 djm 1639: ssh_init_stdio_forwarding(struct ssh *ssh)
1.331 dtucker 1640: {
1641: Channel *c;
1.332 djm 1642: int in, out;
1.331 dtucker 1643:
1.441 dtucker 1644: if (options.stdio_forward_host == NULL)
1.368 djm 1645: return;
1646:
1.441 dtucker 1647: debug3("%s: %s:%d", __func__, options.stdio_forward_host,
1648: options.stdio_forward_port);
1.332 djm 1649:
1.368 djm 1650: if ((in = dup(STDIN_FILENO)) < 0 ||
1651: (out = dup(STDOUT_FILENO)) < 0)
1.332 djm 1652: fatal("channel_connect_stdio_fwd: dup() in/out failed");
1.463 djm 1653: if ((c = channel_connect_stdio_fwd(ssh, options.stdio_forward_host,
1.441 dtucker 1654: options.stdio_forward_port, in, out)) == NULL)
1.368 djm 1655: fatal("%s: channel_connect_stdio_fwd failed", __func__);
1.463 djm 1656: channel_register_cleanup(ssh, c->self, client_cleanup_stdio_fwd, 0);
1657: channel_register_open_confirm(ssh, c->self, ssh_stdio_confirm, NULL);
1.331 dtucker 1658: }
1659:
1660: static void
1.466 djm 1661: ssh_init_forwarding(struct ssh *ssh, char **ifname)
1.70 markus 1662: {
1.86 markus 1663: int success = 0;
1.70 markus 1664: int i;
1.331 dtucker 1665:
1.70 markus 1666: /* Initiate local TCP/IP port forwardings. */
1667: for (i = 0; i < options.num_local_forwards; i++) {
1.232 djm 1668: debug("Local connections to %.200s:%d forwarded to remote "
1669: "address %.200s:%d",
1.406 millert 1670: (options.local_forwards[i].listen_path != NULL) ?
1671: options.local_forwards[i].listen_path :
1.234 deraadt 1672: (options.local_forwards[i].listen_host == NULL) ?
1.406 millert 1673: (options.fwd_opts.gateway_ports ? "*" : "LOCALHOST") :
1.232 djm 1674: options.local_forwards[i].listen_host,
1675: options.local_forwards[i].listen_port,
1.406 millert 1676: (options.local_forwards[i].connect_path != NULL) ?
1677: options.local_forwards[i].connect_path :
1.232 djm 1678: options.local_forwards[i].connect_host,
1679: options.local_forwards[i].connect_port);
1.463 djm 1680: success += channel_setup_local_fwd_listener(ssh,
1.406 millert 1681: &options.local_forwards[i], &options.fwd_opts);
1.70 markus 1682: }
1.283 markus 1683: if (i > 0 && success != i && options.exit_on_forward_failure)
1684: fatal("Could not request local forwarding.");
1.86 markus 1685: if (i > 0 && success == 0)
1686: error("Could not request local forwarding.");
1.70 markus 1687:
1688: /* Initiate remote TCP/IP port forwardings. */
1689: for (i = 0; i < options.num_remote_forwards; i++) {
1.232 djm 1690: debug("Remote connections from %.200s:%d forwarded to "
1691: "local address %.200s:%d",
1.406 millert 1692: (options.remote_forwards[i].listen_path != NULL) ?
1693: options.remote_forwards[i].listen_path :
1.248 djm 1694: (options.remote_forwards[i].listen_host == NULL) ?
1.253 djm 1695: "LOCALHOST" : options.remote_forwards[i].listen_host,
1.232 djm 1696: options.remote_forwards[i].listen_port,
1.406 millert 1697: (options.remote_forwards[i].connect_path != NULL) ?
1698: options.remote_forwards[i].connect_path :
1.232 djm 1699: options.remote_forwards[i].connect_host,
1700: options.remote_forwards[i].connect_port);
1.366 markus 1701: options.remote_forwards[i].handle =
1.463 djm 1702: channel_request_remote_forwarding(ssh,
1.406 millert 1703: &options.remote_forwards[i]);
1.366 markus 1704: if (options.remote_forwards[i].handle < 0) {
1.283 markus 1705: if (options.exit_on_forward_failure)
1706: fatal("Could not request remote forwarding.");
1707: else
1708: logit("Warning: Could not request remote "
1709: "forwarding.");
1.366 markus 1710: } else {
1.463 djm 1711: client_register_global_confirm(
1712: ssh_confirm_remote_forward,
1.366 markus 1713: &options.remote_forwards[i]);
1.283 markus 1714: }
1.70 markus 1715: }
1.301 djm 1716:
1717: /* Initiate tunnel forwarding. */
1718: if (options.tun_open != SSH_TUNMODE_NO) {
1.466 djm 1719: if ((*ifname = client_request_tun_fwd(ssh,
1720: options.tun_open, options.tun_local,
1721: options.tun_remote)) == NULL) {
1.301 djm 1722: if (options.exit_on_forward_failure)
1723: fatal("Could not request tunnel forwarding.");
1724: else
1725: error("Could not request tunnel forwarding.");
1726: }
1.468 djm 1727: }
1.70 markus 1728: }
1729:
1.126 itojun 1730: static void
1.70 markus 1731: check_agent_present(void)
1732: {
1.412 djm 1733: int r;
1734:
1.70 markus 1735: if (options.forward_agent) {
1.254 djm 1736: /* Clear agent forwarding if we don't have an agent. */
1.412 djm 1737: if ((r = ssh_get_authentication_socket(NULL)) != 0) {
1.70 markus 1738: options.forward_agent = 0;
1.412 djm 1739: if (r != SSH_ERR_AGENT_NOT_PRESENT)
1740: debug("ssh_get_authentication_socket: %s",
1741: ssh_err(r));
1742: }
1.70 markus 1743: }
1744: }
1745:
1.214 djm 1746: static void
1.463 djm 1747: ssh_session2_setup(struct ssh *ssh, int id, int success, void *arg)
1.214 djm 1748: {
1.215 djm 1749: extern char **environ;
1.243 djm 1750: const char *display;
1751: int interactive = tty_flag;
1.433 djm 1752: char *proto = NULL, *data = NULL;
1.337 djm 1753:
1754: if (!success)
1755: return; /* No need for error message, channels code sens one */
1.215 djm 1756:
1.248 djm 1757: display = getenv("DISPLAY");
1.417 djm 1758: if (display == NULL && options.forward_x11)
1759: debug("X11 forwarding requested but DISPLAY not set");
1.463 djm 1760: if (options.forward_x11 && client_x11_get_proto(ssh, display,
1.433 djm 1761: options.xauth_location, options.forward_x11_trusted,
1762: options.forward_x11_timeout, &proto, &data) == 0) {
1.50 markus 1763: /* Request forwarding with authentication spoofing. */
1.316 djm 1764: debug("Requesting X11 forwarding with authentication "
1765: "spoofing.");
1.463 djm 1766: x11_request_forwarding_with_spoofing(ssh, id, display, proto,
1.363 djm 1767: data, 1);
1.463 djm 1768: client_expect_confirm(ssh, id, "X11 forwarding", CONFIRM_WARN);
1.363 djm 1769: /* XXX exit_on_forward_failure */
1.80 markus 1770: interactive = 1;
1.50 markus 1771: }
1772:
1.70 markus 1773: check_agent_present();
1774: if (options.forward_agent) {
1775: debug("Requesting authentication agent forwarding.");
1.463 djm 1776: channel_request_start(ssh, id, "auth-agent-req@openssh.com", 0);
1.70 markus 1777: packet_send();
1.212 djm 1778: }
1.369 dtucker 1779:
1780: /* Tell the packet module whether this is an interactive session. */
1781: packet_set_interactive(interactive,
1782: options.ip_qos_interactive, options.ip_qos_bulk);
1.212 djm 1783:
1.463 djm 1784: client_session2_setup(ssh, id, tty_flag, subsystem_flag, getenv("TERM"),
1.482 markus 1785: NULL, fileno(stdin), command, environ);
1.45 markus 1786: }
1787:
1.143 markus 1788: /* open new channel for a session */
1.126 itojun 1789: static int
1.463 djm 1790: ssh_session2_open(struct ssh *ssh)
1.45 markus 1791: {
1.118 markus 1792: Channel *c;
1793: int window, packetmax, in, out, err;
1.60 markus 1794:
1.62 markus 1795: if (stdin_null_flag) {
1.93 itojun 1796: in = open(_PATH_DEVNULL, O_RDONLY);
1.62 markus 1797: } else {
1798: in = dup(STDIN_FILENO);
1799: }
1.60 markus 1800: out = dup(STDOUT_FILENO);
1801: err = dup(STDERR_FILENO);
1.45 markus 1802:
1803: if (in < 0 || out < 0 || err < 0)
1.62 markus 1804: fatal("dup() in/out/err failed");
1.45 markus 1805:
1.69 markus 1806: /* enable nonblocking unless tty */
1807: if (!isatty(in))
1808: set_nonblock(in);
1809: if (!isatty(out))
1810: set_nonblock(out);
1811: if (!isatty(err))
1812: set_nonblock(err);
1813:
1.65 markus 1814: window = CHAN_SES_WINDOW_DEFAULT;
1815: packetmax = CHAN_SES_PACKET_DEFAULT;
1.164 markus 1816: if (tty_flag) {
1817: window >>= 1;
1818: packetmax >>= 1;
1.45 markus 1819: }
1.463 djm 1820: c = channel_new(ssh,
1.45 markus 1821: "session", SSH_CHANNEL_OPENING, in, out, err,
1.65 markus 1822: window, packetmax, CHAN_EXTENDED_WRITE,
1.192 markus 1823: "client-session", /*nonblock*/0);
1.45 markus 1824:
1.463 djm 1825: debug3("%s: channel_new: %d", __func__, c->self);
1.106 markus 1826:
1.463 djm 1827: channel_send_open(ssh, c->self);
1.143 markus 1828: if (!no_shell_flag)
1.463 djm 1829: channel_register_open_confirm(ssh, c->self,
1.310 djm 1830: ssh_session2_setup, NULL);
1.106 markus 1831:
1.118 markus 1832: return c->self;
1.106 markus 1833: }
1834:
1.126 itojun 1835: static int
1.466 djm 1836: ssh_session2(struct ssh *ssh, struct passwd *pw)
1.106 markus 1837: {
1.467 djm 1838: int devnull, id = -1;
1.466 djm 1839: char *cp, *tun_fwd_ifname = NULL;
1.106 markus 1840:
1841: /* XXX should be pre-session */
1.368 djm 1842: if (!options.control_persist)
1.463 djm 1843: ssh_init_stdio_forwarding(ssh);
1.466 djm 1844:
1845: ssh_init_forwarding(ssh, &tun_fwd_ifname);
1846:
1847: if (options.local_command != NULL) {
1848: debug3("expanding LocalCommand: %s", options.local_command);
1849: cp = options.local_command;
1850: options.local_command = percent_expand(cp,
1851: "C", conn_hash_hex,
1852: "L", shorthost,
1853: "d", pw->pw_dir,
1854: "h", host,
1.479 djm 1855: "i", uidstr,
1.466 djm 1856: "l", thishost,
1857: "n", host_arg,
1858: "p", portstr,
1859: "r", options.user,
1860: "u", pw->pw_name,
1861: "T", tun_fwd_ifname == NULL ? "NONE" : tun_fwd_ifname,
1862: (char *)NULL);
1863: debug3("expanded LocalCommand: %s", options.local_command);
1864: free(cp);
1865: }
1.106 markus 1866:
1.344 djm 1867: /* Start listening for multiplex clients */
1.447 markus 1868: if (!packet_get_mux())
1.463 djm 1869: muxserver_listen(ssh);
1.344 djm 1870:
1.473 djm 1871: /*
1.368 djm 1872: * If we are in control persist mode and have a working mux listen
1873: * socket, then prepare to background ourselves and have a foreground
1874: * client attach as a control slave.
1875: * NB. we must save copies of the flags that we override for
1.344 djm 1876: * the backgrounding, since we defer attachment of the slave until
1877: * after the connection is fully established (in particular,
1878: * async rfwd replies have been received for ExitOnForwardFailure).
1879: */
1.473 djm 1880: if (options.control_persist && muxserver_sock != -1) {
1.344 djm 1881: ostdin_null_flag = stdin_null_flag;
1882: ono_shell_flag = no_shell_flag;
1.359 djm 1883: orequest_tty = options.request_tty;
1.344 djm 1884: otty_flag = tty_flag;
1.473 djm 1885: stdin_null_flag = 1;
1886: no_shell_flag = 1;
1887: tty_flag = 0;
1.344 djm 1888: if (!fork_after_authentication_flag)
1889: need_controlpersist_detach = 1;
1890: fork_after_authentication_flag = 1;
1.473 djm 1891: }
1.368 djm 1892: /*
1893: * ControlPersist mux listen socket setup failed, attempt the
1894: * stdio forward setup that we skipped earlier.
1895: */
1896: if (options.control_persist && muxserver_sock == -1)
1.463 djm 1897: ssh_init_stdio_forwarding(ssh);
1.344 djm 1898:
1.471 djm 1899: if (!no_shell_flag)
1.463 djm 1900: id = ssh_session2_open(ssh);
1.379 djm 1901: else {
1902: packet_set_interactive(
1903: options.control_master == SSHCTL_MASTER_NO,
1904: options.ip_qos_interactive, options.ip_qos_bulk);
1905: }
1.314 djm 1906:
1907: /* If we don't expect to open a new session, then disallow it */
1.319 markus 1908: if (options.control_master == SSHCTL_MASTER_NO &&
1909: (datafellows & SSH_NEW_OPENSSH)) {
1.314 djm 1910: debug("Requesting no-more-sessions@openssh.com");
1911: packet_start(SSH2_MSG_GLOBAL_REQUEST);
1912: packet_put_cstring("no-more-sessions@openssh.com");
1913: packet_put_char(0);
1914: packet_send();
1915: }
1.255 reyk 1916:
1917: /* Execute a local command */
1918: if (options.local_command != NULL &&
1919: options.permit_local_command)
1920: ssh_local_cmd(options.local_command);
1.467 djm 1921:
1922: /*
1923: * stdout is now owned by the session channel; clobber it here
1924: * so future channel closes are propagated to the local fd.
1925: * NB. this can only happen after LocalCommand has completed,
1926: * as it may want to write to stdout.
1927: */
1.469 djm 1928: if (!need_controlpersist_detach) {
1929: if ((devnull = open(_PATH_DEVNULL, O_WRONLY)) == -1)
1930: error("%s: open %s: %s", __func__,
1931: _PATH_DEVNULL, strerror(errno));
1932: if (dup2(devnull, STDOUT_FILENO) < 0)
1933: fatal("%s: dup2() stdout failed", __func__);
1934: if (devnull > STDERR_FILENO)
1935: close(devnull);
1936: }
1.301 djm 1937:
1.342 djm 1938: /*
1939: * If requested and we are not interested in replies to remote
1940: * forwarding requests, then let ssh continue in the background.
1941: */
1.344 djm 1942: if (fork_after_authentication_flag) {
1943: if (options.exit_on_forward_failure &&
1944: options.num_remote_forwards > 0) {
1945: debug("deferring postauth fork until remote forward "
1946: "confirmation received");
1947: } else
1948: fork_postauth();
1.318 djm 1949: }
1.31 markus 1950:
1.463 djm 1951: return client_loop(ssh, tty_flag, tty_flag ?
1.119 stevesk 1952: options.escape_char : SSH_ESCAPECHAR_NONE, id);
1.72 markus 1953: }
1954:
1.426 djm 1955: /* Loads all IdentityFile and CertificateFile keys */
1.126 itojun 1956: static void
1.466 djm 1957: load_public_identity_files(struct passwd *pw)
1.104 markus 1958: {
1.466 djm 1959: char *filename, *cp;
1.460 markus 1960: struct sshkey *public;
1.426 djm 1961: int i;
1962: u_int n_ids, n_certs;
1.335 djm 1963: char *identity_files[SSH_MAX_IDENTITY_FILES];
1.460 markus 1964: struct sshkey *identity_keys[SSH_MAX_IDENTITY_FILES];
1.484 djm 1965: int identity_file_userprovided[SSH_MAX_IDENTITY_FILES];
1.426 djm 1966: char *certificate_files[SSH_MAX_CERTIFICATE_FILES];
1967: struct sshkey *certificates[SSH_MAX_CERTIFICATE_FILES];
1.484 djm 1968: int certificate_file_userprovided[SSH_MAX_CERTIFICATE_FILES];
1.333 markus 1969: #ifdef ENABLE_PKCS11
1.460 markus 1970: struct sshkey **keys;
1.333 markus 1971: int nkeys;
1.335 djm 1972: #endif /* PKCS11 */
1.104 markus 1973:
1.426 djm 1974: n_ids = n_certs = 0;
1.398 tedu 1975: memset(identity_files, 0, sizeof(identity_files));
1976: memset(identity_keys, 0, sizeof(identity_keys));
1.484 djm 1977: memset(identity_file_userprovided, 0,
1978: sizeof(identity_file_userprovided));
1.426 djm 1979: memset(certificate_files, 0, sizeof(certificate_files));
1980: memset(certificates, 0, sizeof(certificates));
1.484 djm 1981: memset(certificate_file_userprovided, 0,
1982: sizeof(certificate_file_userprovided));
1.335 djm 1983:
1984: #ifdef ENABLE_PKCS11
1.333 markus 1985: if (options.pkcs11_provider != NULL &&
1.167 markus 1986: options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
1.333 markus 1987: (pkcs11_init(!options.batch_mode) == 0) &&
1988: (nkeys = pkcs11_add_provider(options.pkcs11_provider, NULL,
1989: &keys)) > 0) {
1990: for (i = 0; i < nkeys; i++) {
1.335 djm 1991: if (n_ids >= SSH_MAX_IDENTITY_FILES) {
1.483 markus 1992: sshkey_free(keys[i]);
1.335 djm 1993: continue;
1994: }
1995: identity_keys[n_ids] = keys[i];
1996: identity_files[n_ids] =
1.333 markus 1997: xstrdup(options.pkcs11_provider); /* XXX */
1.335 djm 1998: n_ids++;
1.167 markus 1999: }
1.378 djm 2000: free(keys);
1.127 markus 2001: }
1.333 markus 2002: #endif /* ENABLE_PKCS11 */
1.335 djm 2003: for (i = 0; i < options.num_identity_files; i++) {
1.373 djm 2004: if (n_ids >= SSH_MAX_IDENTITY_FILES ||
2005: strcasecmp(options.identity_files[i], "none") == 0) {
1.378 djm 2006: free(options.identity_files[i]);
1.426 djm 2007: options.identity_files[i] = NULL;
1.335 djm 2008: continue;
2009: }
1.490 dtucker 2010: cp = tilde_expand_filename(options.identity_files[i], getuid());
1.466 djm 2011: filename = percent_expand(cp, "d", pw->pw_dir,
2012: "u", pw->pw_name, "l", thishost, "h", host,
1.275 djm 2013: "r", options.user, (char *)NULL);
1.378 djm 2014: free(cp);
1.483 markus 2015: check_load(sshkey_load_public(filename, &public, NULL),
2016: filename, "pubkey");
1.131 millert 2017: debug("identity file %s type %d", filename,
2018: public ? public->type : -1);
1.378 djm 2019: free(options.identity_files[i]);
1.335 djm 2020: identity_files[n_ids] = filename;
2021: identity_keys[n_ids] = public;
1.484 djm 2022: identity_file_userprovided[n_ids] =
2023: options.identity_file_userprovided[i];
1.335 djm 2024: if (++n_ids >= SSH_MAX_IDENTITY_FILES)
2025: continue;
2026:
1.426 djm 2027: /*
2028: * If no certificates have been explicitly listed then try
2029: * to add the default certificate variant too.
2030: */
2031: if (options.num_certificate_files != 0)
2032: continue;
1.335 djm 2033: xasprintf(&cp, "%s-cert", filename);
1.483 markus 2034: check_load(sshkey_load_public(cp, &public, NULL),
2035: filename, "pubkey");
1.335 djm 2036: debug("identity file %s type %d", cp,
2037: public ? public->type : -1);
2038: if (public == NULL) {
1.378 djm 2039: free(cp);
1.335 djm 2040: continue;
2041: }
1.483 markus 2042: if (!sshkey_is_cert(public)) {
1.335 djm 2043: debug("%s: key %s type %s is not a certificate",
1.483 markus 2044: __func__, cp, sshkey_type(public));
2045: sshkey_free(public);
1.378 djm 2046: free(cp);
1.335 djm 2047: continue;
2048: }
1.448 djm 2049: /* NB. leave filename pointing to private key */
2050: identity_files[n_ids] = xstrdup(filename);
1.335 djm 2051: identity_keys[n_ids] = public;
1.484 djm 2052: identity_file_userprovided[n_ids] =
2053: options.identity_file_userprovided[i];
1.335 djm 2054: n_ids++;
2055: }
1.426 djm 2056:
2057: if (options.num_certificate_files > SSH_MAX_CERTIFICATE_FILES)
2058: fatal("%s: too many certificates", __func__);
2059: for (i = 0; i < options.num_certificate_files; i++) {
2060: cp = tilde_expand_filename(options.certificate_files[i],
1.490 dtucker 2061: getuid());
1.479 djm 2062: filename = percent_expand(cp,
2063: "d", pw->pw_dir,
2064: "h", host,
1.481 djm 2065: "i", uidstr,
1.479 djm 2066: "l", thishost,
2067: "r", options.user,
2068: "u", pw->pw_name,
2069: (char *)NULL);
1.426 djm 2070: free(cp);
2071:
1.483 markus 2072: check_load(sshkey_load_public(filename, &public, NULL),
2073: filename, "certificate");
1.426 djm 2074: debug("certificate file %s type %d", filename,
2075: public ? public->type : -1);
2076: free(options.certificate_files[i]);
2077: options.certificate_files[i] = NULL;
2078: if (public == NULL) {
2079: free(filename);
2080: continue;
2081: }
1.483 markus 2082: if (!sshkey_is_cert(public)) {
1.426 djm 2083: debug("%s: key %s type %s is not a certificate",
1.483 markus 2084: __func__, filename, sshkey_type(public));
2085: sshkey_free(public);
1.426 djm 2086: free(filename);
2087: continue;
2088: }
2089: certificate_files[n_certs] = filename;
2090: certificates[n_certs] = public;
1.484 djm 2091: certificate_file_userprovided[n_certs] =
2092: options.certificate_file_userprovided[i];
1.426 djm 2093: ++n_certs;
2094: }
2095:
1.335 djm 2096: options.num_identity_files = n_ids;
2097: memcpy(options.identity_files, identity_files, sizeof(identity_files));
2098: memcpy(options.identity_keys, identity_keys, sizeof(identity_keys));
1.484 djm 2099: memcpy(options.identity_file_userprovided,
2100: identity_file_userprovided, sizeof(identity_file_userprovided));
1.426 djm 2101:
2102: options.num_certificate_files = n_certs;
2103: memcpy(options.certificate_files,
2104: certificate_files, sizeof(certificate_files));
2105: memcpy(options.certificates, certificates, sizeof(certificates));
1.484 djm 2106: memcpy(options.certificate_file_userprovided,
2107: certificate_file_userprovided,
2108: sizeof(certificate_file_userprovided));
1.214 djm 2109: }
1.352 djm 2110:
2111: static void
2112: main_sigchld_handler(int sig)
2113: {
2114: int save_errno = errno;
2115: pid_t pid;
2116: int status;
2117:
2118: while ((pid = waitpid(-1, &status, WNOHANG)) > 0 ||
2119: (pid < 0 && errno == EINTR))
2120: ;
2121: errno = save_errno;
2122: }
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