Annotation of src/usr.bin/ssh/ssh.c, Revision 1.498
1.498 ! djm 1: /* $OpenBSD: ssh.c,v 1.497 2018/12/27 03:25:25 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
1.498 ! djm 104:
! 105: #include "opacket.h" /* XXX */
! 106: extern struct ssh *active_state; /* XXX move here */
1.127 markus 107:
1.49 markus 108: extern char *__progname;
1.1 deraadt 109:
1.316 djm 110: /* Flag indicating whether debug mode is on. May be set on the command line. */
1.1 deraadt 111: int debug_flag = 0;
112:
1.359 djm 113: /* Flag indicating whether a tty should be requested */
1.1 deraadt 114: int tty_flag = 0;
115:
1.45 markus 116: /* don't exec a shell */
117: int no_shell_flag = 0;
118:
1.33 markus 119: /*
120: * Flag indicating that nothing should be read from stdin. This can be set
121: * on the command line.
122: */
1.1 deraadt 123: int stdin_null_flag = 0;
124:
1.33 markus 125: /*
1.344 djm 126: * Flag indicating that the current process should be backgrounded and
127: * a new slave launched in the foreground for ControlPersist.
128: */
129: int need_controlpersist_detach = 0;
130:
131: /* Copies of flags for ControlPersist foreground slave */
1.359 djm 132: int ostdin_null_flag, ono_shell_flag, otty_flag, orequest_tty;
1.344 djm 133:
134: /*
1.33 markus 135: * Flag indicating that ssh should fork after authentication. This is useful
1.172 deraadt 136: * so that the passphrase can be entered manually, and then ssh goes to the
1.33 markus 137: * background.
138: */
1.1 deraadt 139: int fork_after_authentication_flag = 0;
140:
1.33 markus 141: /*
142: * General data structure for command line options and options configurable
143: * in configuration files. See readconf.h.
144: */
1.1 deraadt 145: Options options;
146:
1.139 markus 147: /* optional user configfile */
148: char *config = NULL;
149:
1.33 markus 150: /*
151: * Name of the host we are connecting to. This is the name given on the
152: * command line, or the HostName specified for the user-supplied name in a
153: * configuration file.
154: */
1.1 deraadt 155: char *host;
156:
1.466 djm 157: /* Various strings used to to percent_expand() arguments */
158: static char thishost[NI_MAXHOST], shorthost[NI_MAXHOST], portstr[NI_MAXSERV];
159: static char uidstr[32], *host_arg, *conn_hash_hex;
160:
1.22 provos 161: /* socket address the host resolves to */
1.37 markus 162: struct sockaddr_storage hostaddr;
1.1 deraadt 163:
1.112 markus 164: /* Private host keys. */
1.173 markus 165: Sensitive sensitive_data;
1.1 deraadt 166:
1.45 markus 167: /* command to be executed */
1.482 markus 168: struct sshbuf *command;
1.45 markus 169:
1.85 djm 170: /* Should we execute a command or invoke a subsystem? */
171: int subsystem_flag = 0;
172:
1.170 markus 173: /* # of replies received for global requests */
1.315 djm 174: static int remote_forward_confirms_received = 0;
1.170 markus 175:
1.313 djm 176: /* mux.c */
177: extern int muxserver_sock;
178: extern u_int muxclient_command;
179:
1.1 deraadt 180: /* Prints a help message to the user. This function never returns. */
181:
1.126 itojun 182: static void
1.93 itojun 183: usage(void)
1.1 deraadt 184: {
1.208 markus 185: fprintf(stderr,
1.474 djm 186: "usage: ssh [-46AaCfGgKkMNnqsTtVvXxYy] [-B bind_interface]\n"
187: " [-b bind_address] [-c cipher_spec] [-D [bind_address:]port]\n"
188: " [-E log_file] [-e escape_char] [-F configfile] [-I pkcs11]\n"
189: " [-i identity_file] [-J [user@]host[:port]] [-L address]\n"
190: " [-l login_name] [-m mac_spec] [-O ctl_cmd] [-o option] [-p port]\n"
191: " [-Q query_option] [-R address] [-S ctl_path] [-W host:port]\n"
192: " [-w local_tun[:remote_tun]] destination [command]\n"
1.208 markus 193: );
1.257 dtucker 194: exit(255);
1.1 deraadt 195: }
196:
1.466 djm 197: static int ssh_session2(struct ssh *, struct passwd *);
198: static void load_public_identity_files(struct passwd *);
1.352 djm 199: static void main_sigchld_handler(int);
1.312 djm 200:
1.361 djm 201: /* ~/ expand a list of paths. NB. assumes path[n] is heap-allocated. */
202: static void
203: tilde_expand_paths(char **paths, u_int num_paths)
204: {
205: u_int i;
206: char *cp;
207:
208: for (i = 0; i < num_paths; i++) {
1.490 dtucker 209: cp = tilde_expand_filename(paths[i], getuid());
1.378 djm 210: free(paths[i]);
1.361 djm 211: paths[i] = cp;
212: }
213: }
214:
1.400 djm 215: /*
216: * Attempt to resolve a host name / port to a set of addresses and
217: * optionally return any CNAMEs encountered along the way.
218: * Returns NULL on failure.
219: * NB. this function must operate with a options having undefined members.
220: */
1.385 djm 221: static struct addrinfo *
1.400 djm 222: resolve_host(const char *name, int port, int logerr, char *cname, size_t clen)
1.385 djm 223: {
224: char strport[NI_MAXSERV];
225: struct addrinfo hints, *res;
226: int gaierr, loglevel = SYSLOG_LEVEL_DEBUG1;
227:
1.400 djm 228: if (port <= 0)
229: port = default_ssh_port();
230:
1.427 djm 231: snprintf(strport, sizeof strport, "%d", port);
1.398 tedu 232: memset(&hints, 0, sizeof(hints));
1.400 djm 233: hints.ai_family = options.address_family == -1 ?
234: AF_UNSPEC : options.address_family;
1.385 djm 235: hints.ai_socktype = SOCK_STREAM;
236: if (cname != NULL)
237: hints.ai_flags = AI_CANONNAME;
238: if ((gaierr = getaddrinfo(name, strport, &hints, &res)) != 0) {
239: if (logerr || (gaierr != EAI_NONAME && gaierr != EAI_NODATA))
240: loglevel = SYSLOG_LEVEL_ERROR;
241: do_log2(loglevel, "%s: Could not resolve hostname %.100s: %s",
242: __progname, name, ssh_gai_strerror(gaierr));
243: return NULL;
244: }
245: if (cname != NULL && res->ai_canonname != NULL) {
246: if (strlcpy(cname, res->ai_canonname, clen) >= clen) {
247: error("%s: host \"%s\" cname \"%s\" too long (max %lu)",
248: __func__, name, res->ai_canonname, (u_long)clen);
249: if (clen > 0)
250: *cname = '\0';
251: }
252: }
253: return res;
254: }
255:
1.470 djm 256: /* Returns non-zero if name can only be an address and not a hostname */
257: static int
258: is_addr_fast(const char *name)
259: {
260: return (strchr(name, '%') != NULL || strchr(name, ':') != NULL ||
261: strspn(name, "0123456789.") == strlen(name));
262: }
263:
264: /* Returns non-zero if name represents a valid, single address */
265: static int
266: is_addr(const char *name)
267: {
268: char strport[NI_MAXSERV];
269: struct addrinfo hints, *res;
270:
271: if (is_addr_fast(name))
272: return 1;
273:
274: snprintf(strport, sizeof strport, "%u", default_ssh_port());
275: memset(&hints, 0, sizeof(hints));
276: hints.ai_family = options.address_family == -1 ?
277: AF_UNSPEC : options.address_family;
278: hints.ai_socktype = SOCK_STREAM;
279: hints.ai_flags = AI_NUMERICHOST|AI_NUMERICSERV;
280: if (getaddrinfo(name, strport, &hints, &res) != 0)
281: return 0;
282: if (res == NULL || res->ai_next != NULL) {
283: freeaddrinfo(res);
284: return 0;
285: }
286: freeaddrinfo(res);
287: return 1;
288: }
289:
1.385 djm 290: /*
1.413 djm 291: * Attempt to resolve a numeric host address / port to a single address.
292: * Returns a canonical address string.
293: * Returns NULL on failure.
294: * NB. this function must operate with a options having undefined members.
295: */
296: static struct addrinfo *
297: resolve_addr(const char *name, int port, char *caddr, size_t clen)
298: {
299: char addr[NI_MAXHOST], strport[NI_MAXSERV];
300: struct addrinfo hints, *res;
301: int gaierr;
302:
303: if (port <= 0)
304: port = default_ssh_port();
305: snprintf(strport, sizeof strport, "%u", port);
306: memset(&hints, 0, sizeof(hints));
307: hints.ai_family = options.address_family == -1 ?
308: AF_UNSPEC : options.address_family;
309: hints.ai_socktype = SOCK_STREAM;
310: hints.ai_flags = AI_NUMERICHOST|AI_NUMERICSERV;
311: if ((gaierr = getaddrinfo(name, strport, &hints, &res)) != 0) {
312: debug2("%s: could not resolve name %.100s as address: %s",
313: __func__, name, ssh_gai_strerror(gaierr));
314: return NULL;
315: }
316: if (res == NULL) {
317: debug("%s: getaddrinfo %.100s returned no addresses",
318: __func__, name);
319: return NULL;
320: }
321: if (res->ai_next != NULL) {
322: debug("%s: getaddrinfo %.100s returned multiple addresses",
323: __func__, name);
324: goto fail;
325: }
326: if ((gaierr = getnameinfo(res->ai_addr, res->ai_addrlen,
327: addr, sizeof(addr), NULL, 0, NI_NUMERICHOST)) != 0) {
328: debug("%s: Could not format address for name %.100s: %s",
329: __func__, name, ssh_gai_strerror(gaierr));
330: goto fail;
331: }
332: if (strlcpy(caddr, addr, clen) >= clen) {
333: error("%s: host \"%s\" addr \"%s\" too long (max %lu)",
334: __func__, name, addr, (u_long)clen);
335: if (clen > 0)
336: *caddr = '\0';
337: fail:
338: freeaddrinfo(res);
339: return NULL;
340: }
341: return res;
342: }
343:
344: /*
1.385 djm 345: * Check whether the cname is a permitted replacement for the hostname
346: * and perform the replacement if it is.
1.400 djm 347: * NB. this function must operate with a options having undefined members.
1.385 djm 348: */
349: static int
1.443 djm 350: check_follow_cname(int direct, char **namep, const char *cname)
1.385 djm 351: {
352: int i;
353: struct allowed_cname *rule;
354:
355: if (*cname == '\0' || options.num_permitted_cnames == 0 ||
356: strcmp(*namep, cname) == 0)
357: return 0;
1.386 djm 358: if (options.canonicalize_hostname == SSH_CANONICALISE_NO)
1.385 djm 359: return 0;
360: /*
1.386 djm 361: * Don't attempt to canonicalize names that will be interpreted by
1.443 djm 362: * a proxy or jump host unless the user specifically requests so.
1.385 djm 363: */
1.443 djm 364: if (!direct &&
1.386 djm 365: options.canonicalize_hostname != SSH_CANONICALISE_ALWAYS)
1.385 djm 366: return 0;
367: debug3("%s: check \"%s\" CNAME \"%s\"", __func__, *namep, cname);
368: for (i = 0; i < options.num_permitted_cnames; i++) {
369: rule = options.permitted_cnames + i;
1.418 djm 370: if (match_pattern_list(*namep, rule->source_list, 1) != 1 ||
371: match_pattern_list(cname, rule->target_list, 1) != 1)
1.385 djm 372: continue;
1.386 djm 373: verbose("Canonicalized DNS aliased hostname "
1.385 djm 374: "\"%s\" => \"%s\"", *namep, cname);
375: free(*namep);
376: *namep = xstrdup(cname);
377: return 1;
378: }
379: return 0;
380: }
381:
382: /*
383: * Attempt to resolve the supplied hostname after applying the user's
1.387 djm 384: * canonicalization rules. Returns the address list for the host or NULL
385: * if no name was found after canonicalization.
1.400 djm 386: * NB. this function must operate with a options having undefined members.
1.385 djm 387: */
388: static struct addrinfo *
1.400 djm 389: resolve_canonicalize(char **hostp, int port)
1.385 djm 390: {
1.443 djm 391: int i, direct, ndots;
1.413 djm 392: char *cp, *fullhost, newname[NI_MAXHOST];
1.385 djm 393: struct addrinfo *addrs;
394:
395: /*
1.470 djm 396: * Attempt to canonicalise addresses, regardless of
397: * whether hostname canonicalisation was requested
1.385 djm 398: */
1.413 djm 399: if ((addrs = resolve_addr(*hostp, port,
400: newname, sizeof(newname))) != NULL) {
401: debug2("%s: hostname %.100s is address", __func__, *hostp);
402: if (strcasecmp(*hostp, newname) != 0) {
403: debug2("%s: canonicalised address \"%s\" => \"%s\"",
404: __func__, *hostp, newname);
405: free(*hostp);
406: *hostp = xstrdup(newname);
407: }
408: return addrs;
409: }
410:
1.470 djm 411: /*
412: * If this looks like an address but didn't parse as one, it might
413: * be an address with an invalid interface scope. Skip further
414: * attempts at canonicalisation.
415: */
416: if (is_addr_fast(*hostp)) {
417: debug("%s: hostname %.100s is an unrecognised address",
418: __func__, *hostp);
419: return NULL;
420: }
421:
422: if (options.canonicalize_hostname == SSH_CANONICALISE_NO)
423: return NULL;
424:
425: /*
426: * Don't attempt to canonicalize names that will be interpreted by
427: * a proxy unless the user specifically requests so.
428: */
429: direct = option_clear_or_none(options.proxy_command) &&
430: options.jump_host == NULL;
431: if (!direct &&
432: options.canonicalize_hostname != SSH_CANONICALISE_ALWAYS)
433: return NULL;
434:
1.428 djm 435: /* If domain name is anchored, then resolve it now */
436: if ((*hostp)[strlen(*hostp) - 1] == '.') {
437: debug3("%s: name is fully qualified", __func__);
438: fullhost = xstrdup(*hostp);
439: if ((addrs = resolve_host(fullhost, port, 0,
440: newname, sizeof(newname))) != NULL)
441: goto found;
442: free(fullhost);
443: goto notfound;
444: }
445:
1.387 djm 446: /* Don't apply canonicalization to sufficiently-qualified hostnames */
1.385 djm 447: ndots = 0;
448: for (cp = *hostp; *cp != '\0'; cp++) {
449: if (*cp == '.')
450: ndots++;
451: }
1.386 djm 452: if (ndots > options.canonicalize_max_dots) {
453: debug3("%s: not canonicalizing hostname \"%s\" (max dots %d)",
454: __func__, *hostp, options.canonicalize_max_dots);
1.385 djm 455: return NULL;
456: }
457: /* Attempt each supplied suffix */
458: for (i = 0; i < options.num_canonical_domains; i++) {
1.413 djm 459: *newname = '\0';
1.385 djm 460: xasprintf(&fullhost, "%s.%s.", *hostp,
461: options.canonical_domains[i]);
1.400 djm 462: debug3("%s: attempting \"%s\" => \"%s\"", __func__,
463: *hostp, fullhost);
464: if ((addrs = resolve_host(fullhost, port, 0,
1.413 djm 465: newname, sizeof(newname))) == NULL) {
1.385 djm 466: free(fullhost);
467: continue;
468: }
1.428 djm 469: found:
1.385 djm 470: /* Remove trailing '.' */
471: fullhost[strlen(fullhost) - 1] = '\0';
472: /* Follow CNAME if requested */
1.443 djm 473: if (!check_follow_cname(direct, &fullhost, newname)) {
1.386 djm 474: debug("Canonicalized hostname \"%s\" => \"%s\"",
1.385 djm 475: *hostp, fullhost);
476: }
477: free(*hostp);
478: *hostp = fullhost;
479: return addrs;
480: }
1.428 djm 481: notfound:
1.386 djm 482: if (!options.canonicalize_fallback_local)
1.400 djm 483: fatal("%s: Could not resolve host \"%s\"", __progname, *hostp);
484: debug2("%s: host %s not found in any suffix", __func__, *hostp);
1.385 djm 485: return NULL;
486: }
487:
1.32 deraadt 488: /*
1.483 markus 489: * Check the result of hostkey loading, ignoring some errors and
490: * fatal()ing for others.
491: */
492: static void
493: check_load(int r, const char *path, const char *message)
494: {
495: switch (r) {
496: case 0:
497: break;
498: case SSH_ERR_INTERNAL_ERROR:
499: case SSH_ERR_ALLOC_FAIL:
500: fatal("load %s \"%s\": %s", message, path, ssh_err(r));
501: case SSH_ERR_SYSTEM_ERROR:
502: /* Ignore missing files */
503: if (errno == ENOENT)
504: break;
505: /* FALLTHROUGH */
506: default:
507: error("load %s \"%s\": %s", message, path, ssh_err(r));
508: break;
509: }
510: }
511:
512: /*
1.400 djm 513: * Read per-user configuration file. Ignore the system wide config
514: * file if the user specifies a config file on the command line.
515: */
516: static void
1.496 djm 517: process_config_files(const char *host_name, struct passwd *pw, int final_pass,
518: int *want_final_pass)
1.400 djm 519: {
1.414 deraadt 520: char buf[PATH_MAX];
1.400 djm 521: int r;
522:
523: if (config != NULL) {
524: if (strcasecmp(config, "none") != 0 &&
1.466 djm 525: !read_config_file(config, pw, host, host_name, &options,
1.496 djm 526: SSHCONF_USERCONF | (final_pass ? SSHCONF_FINAL : 0),
527: want_final_pass))
1.400 djm 528: fatal("Can't open user config file %.100s: "
529: "%.100s", config, strerror(errno));
530: } else {
531: r = snprintf(buf, sizeof buf, "%s/%s", pw->pw_dir,
532: _PATH_SSH_USER_CONFFILE);
533: if (r > 0 && (size_t)r < sizeof(buf))
1.466 djm 534: (void)read_config_file(buf, pw, host, host_name,
1.408 djm 535: &options, SSHCONF_CHECKPERM | SSHCONF_USERCONF |
1.496 djm 536: (final_pass ? SSHCONF_FINAL : 0), want_final_pass);
1.400 djm 537:
538: /* Read systemwide configuration file after user config. */
1.408 djm 539: (void)read_config_file(_PATH_HOST_CONFIG_FILE, pw,
1.466 djm 540: host, host_name, &options,
1.496 djm 541: final_pass ? SSHCONF_FINAL : 0, want_final_pass);
1.408 djm 542: }
543: }
544:
545: /* Rewrite the port number in an addrinfo list of addresses */
546: static void
547: set_addrinfo_port(struct addrinfo *addrs, int port)
548: {
549: struct addrinfo *addr;
550:
551: for (addr = addrs; addr != NULL; addr = addr->ai_next) {
552: switch (addr->ai_family) {
553: case AF_INET:
554: ((struct sockaddr_in *)addr->ai_addr)->
555: sin_port = htons(port);
556: break;
557: case AF_INET6:
558: ((struct sockaddr_in6 *)addr->ai_addr)->
559: sin6_port = htons(port);
560: break;
561: }
1.400 djm 562: }
563: }
564:
565: /*
1.32 deraadt 566: * Main program for the ssh client.
567: */
1.2 provos 568: int
569: main(int ac, char **av)
1.1 deraadt 570: {
1.437 djm 571: struct ssh *ssh = NULL;
1.462 djm 572: int i, r, opt, exit_status, use_syslog, direct, timeout_ms;
1.496 djm 573: int was_addr, config_test = 0, opt_terminated = 0, want_final_pass = 0;
1.466 djm 574: char *p, *cp, *line, *argv0, buf[PATH_MAX], *logfile;
575: char cname[NI_MAXHOST];
1.31 markus 576: struct stat st;
1.98 markus 577: struct passwd *pw;
1.144 stevesk 578: extern int optind, optreset;
579: extern char *optarg;
1.406 millert 580: struct Forward fwd;
1.385 djm 581: struct addrinfo *addrs = NULL;
1.405 djm 582: struct ssh_digest_ctx *md;
583: u_char conn_hash[SSH_DIGEST_MAX_LENGTH];
1.250 djm 584:
1.436 dtucker 585: ssh_malloc_init(); /* must be called before any mallocs */
1.250 djm 586: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
587: sanitise_stdfd();
1.31 markus 588:
1.33 markus 589: /*
1.346 djm 590: * Discard other fds that are hanging around. These can cause problem
591: * with backgrounded ssh processes started by ControlPersist.
592: */
593: closefrom(STDERR_FILENO + 1);
594:
1.487 dtucker 595: if (getuid() != geteuid())
596: fatal("ssh setuid not supported.");
597: if (getgid() != getegid())
598: fatal("ssh setgid not supported.");
1.184 stevesk 599:
1.107 markus 600: /* Get user data. */
1.490 dtucker 601: pw = getpwuid(getuid());
1.107 markus 602: if (!pw) {
1.490 dtucker 603: logit("No user exists for uid %lu", (u_long)getuid());
1.257 dtucker 604: exit(255);
1.107 markus 605: }
606: /* Take a copy of the returned structure. */
607: pw = pwcopy(pw);
1.31 markus 608:
1.33 markus 609: /*
610: * Set our umask to something reasonable, as some files are created
611: * with the default umask. This will make them world-readable but
612: * writable only by the owner, which is ok for all files for which we
613: * don't set the modes explicitly.
614: */
1.31 markus 615: umask(022);
1.445 djm 616:
617: setlocale(LC_CTYPE, "");
1.31 markus 618:
1.316 djm 619: /*
620: * Initialize option structure to indicate that no values have been
621: * set.
622: */
1.31 markus 623: initialize_options(&options);
624:
1.463 djm 625: /*
626: * Prepare main ssh transport/connection structures
627: */
628: if ((ssh = ssh_alloc_session_state()) == NULL)
629: fatal("Couldn't allocate session state");
630: channel_init_channels(ssh);
631: active_state = ssh; /* XXX legacy API compat */
632:
1.31 markus 633: /* Parse command-line arguments. */
634: host = NULL;
1.320 djm 635: use_syslog = 0;
1.375 dtucker 636: logfile = NULL;
1.325 markus 637: argv0 = av[0];
1.31 markus 638:
1.266 djm 639: again:
1.316 djm 640: while ((opt = getopt(ac, av, "1246ab:c:e:fgi:kl:m:no:p:qstvx"
1.474 djm 641: "AB:CD:E:F:GI:J:KL:MNO:PQ:R:S:TVw:W:XYy")) != -1) {
1.31 markus 642: switch (opt) {
1.91 jakob 643: case '1':
1.454 djm 644: fatal("SSH protocol v.1 is no longer supported");
1.91 jakob 645: break;
1.47 markus 646: case '2':
1.454 djm 647: /* Ignored */
1.47 markus 648: break;
1.37 markus 649: case '4':
1.196 djm 650: options.address_family = AF_INET;
1.37 markus 651: break;
652: case '6':
1.196 djm 653: options.address_family = AF_INET6;
1.37 markus 654: break;
1.31 markus 655: case 'n':
656: stdin_null_flag = 1;
657: break;
658: case 'f':
659: fork_after_authentication_flag = 1;
660: stdin_null_flag = 1;
661: break;
662: case 'x':
663: options.forward_x11 = 0;
664: break;
665: case 'X':
666: options.forward_x11 = 1;
667: break;
1.320 djm 668: case 'y':
669: use_syslog = 1;
670: break;
1.375 dtucker 671: case 'E':
1.422 dtucker 672: logfile = optarg;
1.375 dtucker 673: break;
1.408 djm 674: case 'G':
675: config_test = 1;
676: break;
1.202 markus 677: case 'Y':
678: options.forward_x11 = 1;
679: options.forward_x11_trusted = 1;
680: break;
1.31 markus 681: case 'g':
1.406 millert 682: options.fwd_opts.gateway_ports = 1;
1.31 markus 683: break;
1.229 djm 684: case 'O':
1.441 dtucker 685: if (options.stdio_forward_host != NULL)
1.332 djm 686: fatal("Cannot specify multiplexing "
687: "command with -W");
688: else if (muxclient_command != 0)
689: fatal("Multiplexing command already specified");
1.229 djm 690: if (strcmp(optarg, "check") == 0)
1.312 djm 691: muxclient_command = SSHMUX_COMMAND_ALIVE_CHECK;
1.338 markus 692: else if (strcmp(optarg, "forward") == 0)
693: muxclient_command = SSHMUX_COMMAND_FORWARD;
1.229 djm 694: else if (strcmp(optarg, "exit") == 0)
1.312 djm 695: muxclient_command = SSHMUX_COMMAND_TERMINATE;
1.357 djm 696: else if (strcmp(optarg, "stop") == 0)
697: muxclient_command = SSHMUX_COMMAND_STOP;
1.365 djm 698: else if (strcmp(optarg, "cancel") == 0)
699: muxclient_command = SSHMUX_COMMAND_CANCEL_FWD;
1.447 markus 700: else if (strcmp(optarg, "proxy") == 0)
701: muxclient_command = SSHMUX_COMMAND_PROXY;
1.229 djm 702: else
703: fatal("Invalid multiplex command.");
704: break;
1.183 stevesk 705: case 'P': /* deprecated */
1.376 djm 706: break;
1.394 deraadt 707: case 'Q':
1.376 djm 708: cp = NULL;
1.394 deraadt 709: if (strcmp(optarg, "cipher") == 0)
1.393 djm 710: cp = cipher_alg_list('\n', 0);
1.394 deraadt 711: else if (strcmp(optarg, "cipher-auth") == 0)
1.393 djm 712: cp = cipher_alg_list('\n', 1);
1.394 deraadt 713: else if (strcmp(optarg, "mac") == 0)
1.392 dtucker 714: cp = mac_alg_list('\n');
1.394 deraadt 715: else if (strcmp(optarg, "kex") == 0)
1.392 dtucker 716: cp = kex_alg_list('\n');
1.394 deraadt 717: else if (strcmp(optarg, "key") == 0)
1.451 djm 718: cp = sshkey_alg_list(0, 0, 0, '\n');
1.396 markus 719: else if (strcmp(optarg, "key-cert") == 0)
1.451 djm 720: cp = sshkey_alg_list(1, 0, 0, '\n');
1.396 markus 721: else if (strcmp(optarg, "key-plain") == 0)
1.451 djm 722: cp = sshkey_alg_list(0, 1, 0, '\n');
1.491 djm 723: else if (strcmp(optarg, "sig") == 0)
1.492 djm 724: cp = sshkey_alg_list(0, 1, 1, '\n');
1.491 djm 725: else if (strcmp(optarg, "protocol-version") == 0)
1.416 djm 726: cp = xstrdup("2");
1.491 djm 727: else if (strcmp(optarg, "help") == 0) {
728: cp = xstrdup(
729: "cipher\ncipher-auth\nkex\nkey\n"
730: "key-cert\nkey-plain\nmac\n"
731: "protocol-version\nsig");
1.416 djm 732: }
1.376 djm 733: if (cp == NULL)
734: fatal("Unsupported query \"%s\"", optarg);
735: printf("%s\n", cp);
736: free(cp);
737: exit(0);
1.31 markus 738: break;
739: case 'a':
740: options.forward_agent = 0;
1.53 markus 741: break;
742: case 'A':
743: options.forward_agent = 1;
1.31 markus 744: break;
745: case 'k':
1.204 dtucker 746: options.gss_deleg_creds = 0;
1.297 djm 747: break;
748: case 'K':
749: options.gss_authentication = 1;
750: options.gss_deleg_creds = 1;
1.31 markus 751: break;
752: case 'i':
1.490 dtucker 753: p = tilde_expand_filename(optarg, getuid());
1.429 dtucker 754: if (stat(p, &st) < 0)
1.128 fgsch 755: fprintf(stderr, "Warning: Identity file %s "
1.429 dtucker 756: "not accessible: %s.\n", p,
1.231 otto 757: strerror(errno));
1.429 dtucker 758: else
759: add_identity_file(&options, NULL, p, 1);
760: free(p);
1.31 markus 761: break;
1.127 markus 762: case 'I':
1.333 markus 763: #ifdef ENABLE_PKCS11
1.422 dtucker 764: free(options.pkcs11_provider);
1.333 markus 765: options.pkcs11_provider = xstrdup(optarg);
1.137 jakob 766: #else
1.333 markus 767: fprintf(stderr, "no support for PKCS#11.\n");
1.137 jakob 768: #endif
1.127 markus 769: break;
1.443 djm 770: case 'J':
771: if (options.jump_host != NULL)
772: fatal("Only a single -J option permitted");
773: if (options.proxy_command != NULL)
774: fatal("Cannot specify -J with ProxyCommand");
775: if (parse_jump(optarg, &options, 1) == -1)
776: fatal("Invalid -J argument");
777: options.proxy_command = xstrdup("none");
778: break;
1.31 markus 779: case 't':
1.359 djm 780: if (options.request_tty == REQUEST_TTY_YES)
781: options.request_tty = REQUEST_TTY_FORCE;
782: else
783: options.request_tty = REQUEST_TTY_YES;
1.31 markus 784: break;
785: case 'v':
1.197 markus 786: if (debug_flag == 0) {
1.66 markus 787: debug_flag = 1;
788: options.log_level = SYSLOG_LEVEL_DEBUG1;
1.197 markus 789: } else {
1.443 djm 790: if (options.log_level < SYSLOG_LEVEL_DEBUG3) {
791: debug_flag++;
1.197 markus 792: options.log_level++;
1.443 djm 793: }
1.197 markus 794: }
1.375 dtucker 795: break;
1.31 markus 796: case 'V':
1.209 markus 797: fprintf(stderr, "%s, %s\n",
1.402 markus 798: SSH_VERSION,
799: #ifdef WITH_OPENSSL
1.495 djm 800: OpenSSL_version(OPENSSL_VERSION)
1.402 markus 801: #else
802: "without OpenSSL"
803: #endif
804: );
1.31 markus 805: if (opt == 'V')
806: exit(0);
807: break;
1.255 reyk 808: case 'w':
1.256 reyk 809: if (options.tun_open == -1)
810: options.tun_open = SSH_TUNMODE_DEFAULT;
1.255 reyk 811: options.tun_local = a2tun(optarg, &options.tun_remote);
1.256 reyk 812: if (options.tun_local == SSH_TUNID_ERR) {
1.316 djm 813: fprintf(stderr,
814: "Bad tun device '%s'\n", optarg);
1.257 dtucker 815: exit(255);
1.255 reyk 816: }
817: break;
1.331 dtucker 818: case 'W':
1.441 dtucker 819: if (options.stdio_forward_host != NULL)
1.332 djm 820: fatal("stdio forward already specified");
821: if (muxclient_command != 0)
822: fatal("Cannot specify stdio forward with -O");
1.331 dtucker 823: if (parse_forward(&fwd, optarg, 1, 0)) {
1.441 dtucker 824: options.stdio_forward_host = fwd.listen_host;
825: options.stdio_forward_port = fwd.listen_port;
1.378 djm 826: free(fwd.connect_host);
1.331 dtucker 827: } else {
828: fprintf(stderr,
829: "Bad stdio forwarding specification '%s'\n",
830: optarg);
831: exit(255);
832: }
1.359 djm 833: options.request_tty = REQUEST_TTY_NO;
1.331 dtucker 834: no_shell_flag = 1;
835: break;
1.31 markus 836: case 'q':
837: options.log_level = SYSLOG_LEVEL_QUIET;
838: break;
839: case 'e':
840: if (optarg[0] == '^' && optarg[2] == 0 &&
1.128 fgsch 841: (u_char) optarg[1] >= 64 &&
842: (u_char) optarg[1] < 128)
1.78 markus 843: options.escape_char = (u_char) optarg[1] & 31;
1.31 markus 844: else if (strlen(optarg) == 1)
1.78 markus 845: options.escape_char = (u_char) optarg[0];
1.31 markus 846: else if (strcmp(optarg, "none") == 0)
1.119 stevesk 847: options.escape_char = SSH_ESCAPECHAR_NONE;
1.31 markus 848: else {
1.128 fgsch 849: fprintf(stderr, "Bad escape character '%s'.\n",
850: optarg);
1.257 dtucker 851: exit(255);
1.31 markus 852: }
853: break;
854: case 'c':
1.456 djm 855: if (!ciphers_valid(*optarg == '+' ?
1.420 djm 856: optarg + 1 : optarg)) {
857: fprintf(stderr, "Unknown cipher type '%s'\n",
858: optarg);
859: exit(255);
1.95 markus 860: }
1.456 djm 861: free(options.ciphers);
862: options.ciphers = xstrdup(optarg);
1.95 markus 863: break;
864: case 'm':
1.422 dtucker 865: if (mac_valid(optarg)) {
866: free(options.macs);
1.95 markus 867: options.macs = xstrdup(optarg);
1.422 dtucker 868: } else {
1.128 fgsch 869: fprintf(stderr, "Unknown mac type '%s'\n",
870: optarg);
1.257 dtucker 871: exit(255);
1.31 markus 872: }
873: break;
1.214 djm 874: case 'M':
1.242 djm 875: if (options.control_master == SSHCTL_MASTER_YES)
876: options.control_master = SSHCTL_MASTER_ASK;
877: else
878: options.control_master = SSHCTL_MASTER_YES;
1.214 djm 879: break;
1.31 markus 880: case 'p':
1.465 millert 881: if (options.port == -1) {
882: options.port = a2port(optarg);
883: if (options.port <= 0) {
884: fprintf(stderr, "Bad port '%s'\n",
885: optarg);
886: exit(255);
887: }
1.109 markus 888: }
1.31 markus 889: break;
890: case 'l':
1.465 millert 891: if (options.user == NULL)
892: options.user = optarg;
1.31 markus 893: break;
1.141 stevesk 894:
895: case 'L':
1.324 djm 896: if (parse_forward(&fwd, optarg, 0, 0))
1.232 djm 897: add_local_forward(&options, &fwd);
898: else {
1.128 fgsch 899: fprintf(stderr,
1.232 djm 900: "Bad local forwarding specification '%s'\n",
1.128 fgsch 901: optarg);
1.257 dtucker 902: exit(255);
1.31 markus 903: }
1.232 djm 904: break;
905:
906: case 'R':
1.464 markus 907: if (parse_forward(&fwd, optarg, 0, 1) ||
908: parse_forward(&fwd, optarg, 1, 1)) {
1.232 djm 909: add_remote_forward(&options, &fwd);
910: } else {
1.128 fgsch 911: fprintf(stderr,
1.232 djm 912: "Bad remote forwarding specification "
913: "'%s'\n", optarg);
1.257 dtucker 914: exit(255);
1.31 markus 915: }
916: break;
1.108 markus 917:
918: case 'D':
1.324 djm 919: if (parse_forward(&fwd, optarg, 1, 0)) {
1.322 stevesk 920: add_local_forward(&options, &fwd);
1.232 djm 921: } else {
1.322 stevesk 922: fprintf(stderr,
923: "Bad dynamic forwarding specification "
924: "'%s'\n", optarg);
1.257 dtucker 925: exit(255);
1.109 markus 926: }
1.108 markus 927: break;
928:
1.31 markus 929: case 'C':
930: options.compression = 1;
931: break;
1.45 markus 932: case 'N':
933: no_shell_flag = 1;
1.359 djm 934: options.request_tty = REQUEST_TTY_NO;
1.45 markus 935: break;
936: case 'T':
1.359 djm 937: options.request_tty = REQUEST_TTY_NO;
1.45 markus 938: break;
1.31 markus 939: case 'o':
1.205 markus 940: line = xstrdup(optarg);
1.408 djm 941: if (process_config_line(&options, pw,
942: host ? host : "", host ? host : "", line,
943: "command-line", 0, NULL, SSHCONF_USERCONF) != 0)
1.257 dtucker 944: exit(255);
1.378 djm 945: free(line);
1.31 markus 946: break;
1.85 djm 947: case 's':
948: subsystem_flag = 1;
1.117 markus 949: break;
1.214 djm 950: case 'S':
1.431 mmcc 951: free(options.control_path);
1.214 djm 952: options.control_path = xstrdup(optarg);
953: break;
1.117 markus 954: case 'b':
955: options.bind_address = optarg;
1.474 djm 956: break;
957: case 'B':
958: options.bind_interface = optarg;
1.85 djm 959: break;
1.139 markus 960: case 'F':
961: config = optarg;
962: break;
1.31 markus 963: default:
964: usage();
1.1 deraadt 965: }
1.31 markus 966: }
967:
1.462 djm 968: if (optind > 1 && strcmp(av[optind - 1], "--") == 0)
969: opt_terminated = 1;
970:
1.128 fgsch 971: ac -= optind;
972: av += optind;
973:
1.329 guenther 974: if (ac > 0 && !host) {
1.465 millert 975: int tport;
976: char *tuser;
977: switch (parse_ssh_uri(*av, &tuser, &host, &tport)) {
978: case -1:
979: usage();
980: break;
981: case 0:
982: if (options.user == NULL) {
983: options.user = tuser;
984: tuser = NULL;
985: }
986: free(tuser);
987: if (options.port == -1 && tport != -1)
988: options.port = tport;
989: break;
990: default:
1.128 fgsch 991: p = xstrdup(*av);
1.188 markus 992: cp = strrchr(p, '@');
1.465 millert 993: if (cp != NULL) {
994: if (cp == p)
995: usage();
996: if (options.user == NULL) {
997: options.user = p;
998: p = NULL;
999: }
1000: *cp++ = '\0';
1001: host = xstrdup(cp);
1002: free(p);
1003: } else
1004: host = p;
1005: break;
1006: }
1.462 djm 1007: if (ac > 1 && !opt_terminated) {
1.189 millert 1008: optind = optreset = 1;
1.128 fgsch 1009: goto again;
1010: }
1.189 millert 1011: ac--, av++;
1.128 fgsch 1012: }
1013:
1.31 markus 1014: /* Check that we got a host name. */
1015: if (!host)
1016: usage();
1017:
1.385 djm 1018: host_arg = xstrdup(host);
1019:
1.402 markus 1020: #ifdef WITH_OPENSSL
1.350 djm 1021: OpenSSL_add_all_algorithms();
1.72 markus 1022: ERR_load_crypto_strings();
1.402 markus 1023: #endif
1.31 markus 1024:
1025: /* Initialize the command to execute on remote host. */
1.482 markus 1026: if ((command = sshbuf_new()) == NULL)
1027: fatal("sshbuf_new failed");
1.1 deraadt 1028:
1.33 markus 1029: /*
1030: * Save the command to execute on the remote host in a buffer. There
1031: * is no limit on the length of the command, except by the maximum
1032: * packet size. Also sets the tty flag if there is no command.
1033: */
1.128 fgsch 1034: if (!ac) {
1.31 markus 1035: /* No command specified - execute shell on a tty. */
1.85 djm 1036: if (subsystem_flag) {
1.128 fgsch 1037: fprintf(stderr,
1038: "You must specify a subsystem to invoke.\n");
1.85 djm 1039: usage();
1040: }
1.31 markus 1041: } else {
1.128 fgsch 1042: /* A command has been specified. Store it into the buffer. */
1043: for (i = 0; i < ac; i++) {
1.482 markus 1044: if ((r = sshbuf_putf(command, "%s%s",
1045: i ? " " : "", av[i])) != 0)
1046: fatal("%s: buffer error: %s",
1047: __func__, ssh_err(r));
1.31 markus 1048: }
1049: }
1050:
1.101 markus 1051: /*
1052: * Initialize "log" output. Since we are the client all output
1.375 dtucker 1053: * goes to stderr unless otherwise specified by -y or -E.
1.101 markus 1054: */
1.375 dtucker 1055: if (use_syslog && logfile != NULL)
1056: fatal("Can't specify both -y and -E");
1.422 dtucker 1057: if (logfile != NULL)
1.375 dtucker 1058: log_redirect_stderr_to(logfile);
1.325 markus 1059: log_init(argv0,
1.468 djm 1060: options.log_level == SYSLOG_LEVEL_NOT_SET ?
1.452 dtucker 1061: SYSLOG_LEVEL_INFO : options.log_level,
1.468 djm 1062: options.log_facility == SYSLOG_FACILITY_NOT_SET ?
1.452 dtucker 1063: SYSLOG_FACILITY_USER : options.log_facility,
1064: !use_syslog);
1.375 dtucker 1065:
1066: if (debug_flag)
1.402 markus 1067: logit("%s, %s", SSH_VERSION,
1068: #ifdef WITH_OPENSSL
1.495 djm 1069: OpenSSL_version(OPENSSL_VERSION)
1.402 markus 1070: #else
1071: "without OpenSSL"
1072: #endif
1073: );
1.31 markus 1074:
1.400 djm 1075: /* Parse the configuration files */
1.496 djm 1076: process_config_files(host_arg, pw, 0, &want_final_pass);
1077: if (want_final_pass)
1078: debug("configuration requests final Match pass");
1.400 djm 1079:
1080: /* Hostname canonicalisation needs a few options filled. */
1081: fill_default_options_for_canonicalization(&options);
1082:
1083: /* If the user has replaced the hostname then take it into use now */
1084: if (options.hostname != NULL) {
1085: /* NB. Please keep in sync with readconf.c:match_cfg_line() */
1086: cp = percent_expand(options.hostname,
1087: "h", host, (char *)NULL);
1088: free(host);
1089: host = cp;
1.408 djm 1090: free(options.hostname);
1091: options.hostname = xstrdup(host);
1.400 djm 1092: }
1093:
1.470 djm 1094: /* Don't lowercase addresses, they will be explicitly canonicalised */
1095: if ((was_addr = is_addr(host)) == 0)
1096: lowercase(host);
1097:
1098: /*
1099: * Try to canonicalize if requested by configuration or the
1100: * hostname is an address.
1101: */
1102: if (options.canonicalize_hostname != SSH_CANONICALISE_NO || was_addr)
1.400 djm 1103: addrs = resolve_canonicalize(&host, options.port);
1104:
1.139 markus 1105: /*
1.401 djm 1106: * If CanonicalizePermittedCNAMEs have been specified but
1107: * other canonicalization did not happen (by not being requested
1108: * or by failing with fallback) then the hostname may still be changed
1.468 djm 1109: * as a result of CNAME following.
1.401 djm 1110: *
1111: * Try to resolve the bare hostname name using the system resolver's
1112: * usual search rules and then apply the CNAME follow rules.
1113: *
1114: * Skip the lookup if a ProxyCommand is being used unless the user
1115: * has specifically requested canonicalisation for this case via
1116: * CanonicalizeHostname=always
1.139 markus 1117: */
1.443 djm 1118: direct = option_clear_or_none(options.proxy_command) &&
1119: options.jump_host == NULL;
1120: if (addrs == NULL && options.num_permitted_cnames != 0 && (direct ||
1121: options.canonicalize_hostname == SSH_CANONICALISE_ALWAYS)) {
1.403 djm 1122: if ((addrs = resolve_host(host, options.port,
1.493 djm 1123: direct, cname, sizeof(cname))) == NULL) {
1.403 djm 1124: /* Don't fatal proxied host names not in the DNS */
1.493 djm 1125: if (direct)
1.403 djm 1126: cleanup_exit(255); /* logged in resolve_host */
1127: } else
1.443 djm 1128: check_follow_cname(direct, &host, cname);
1.400 djm 1129: }
1.139 markus 1130:
1.400 djm 1131: /*
1.408 djm 1132: * If canonicalisation is enabled then re-parse the configuration
1133: * files as new stanzas may match.
1.400 djm 1134: */
1.496 djm 1135: if (options.canonicalize_hostname != 0 && !want_final_pass) {
1136: debug("hostname canonicalisation enabled, "
1137: "will re-parse configuration");
1138: want_final_pass = 1;
1139: }
1140:
1141: if (want_final_pass) {
1142: debug("re-parsing configuration");
1.408 djm 1143: free(options.hostname);
1144: options.hostname = xstrdup(host);
1.496 djm 1145: process_config_files(host_arg, pw, 1, NULL);
1.408 djm 1146: /*
1147: * Address resolution happens early with canonicalisation
1148: * enabled and the port number may have changed since, so
1149: * reset it in address list
1150: */
1151: if (addrs != NULL && options.port > 0)
1152: set_addrinfo_port(addrs, options.port);
1.139 markus 1153: }
1.31 markus 1154:
1155: /* Fill configuration defaults. */
1156: fill_default_options(&options);
1.443 djm 1157:
1158: /*
1159: * If ProxyJump option specified, then construct a ProxyCommand now.
1160: */
1161: if (options.jump_host != NULL) {
1162: char port_s[8];
1.478 djm 1163: const char *sshbin = argv0;
1164:
1165: /*
1166: * Try to use SSH indicated by argv[0], but fall back to
1167: * "ssh" if it appears unavailable.
1168: */
1169: if (strchr(argv0, '/') != NULL && access(argv0, X_OK) != 0)
1170: sshbin = "ssh";
1.443 djm 1171:
1172: /* Consistency check */
1173: if (options.proxy_command != NULL)
1174: fatal("inconsistent options: ProxyCommand+ProxyJump");
1175: /* Never use FD passing for ProxyJump */
1176: options.proxy_use_fdpass = 0;
1177: snprintf(port_s, sizeof(port_s), "%d", options.jump_port);
1178: xasprintf(&options.proxy_command,
1.478 djm 1179: "%s%s%s%s%s%s%s%s%s%s%.*s -W '[%%h]:%%p' %s",
1180: sshbin,
1.443 djm 1181: /* Optional "-l user" argument if jump_user set */
1182: options.jump_user == NULL ? "" : " -l ",
1183: options.jump_user == NULL ? "" : options.jump_user,
1184: /* Optional "-p port" argument if jump_port set */
1185: options.jump_port <= 0 ? "" : " -p ",
1186: options.jump_port <= 0 ? "" : port_s,
1187: /* Optional additional jump hosts ",..." */
1188: options.jump_extra == NULL ? "" : " -J ",
1189: options.jump_extra == NULL ? "" : options.jump_extra,
1190: /* Optional "-F" argumment if -F specified */
1191: config == NULL ? "" : " -F ",
1192: config == NULL ? "" : config,
1193: /* Optional "-v" arguments if -v set */
1194: debug_flag ? " -" : "",
1195: debug_flag, "vvv",
1196: /* Mandatory hostname */
1197: options.jump_host);
1198: debug("Setting implicit ProxyCommand from ProxyJump: %s",
1199: options.proxy_command);
1200: }
1.31 markus 1201:
1.400 djm 1202: if (options.port == 0)
1203: options.port = default_ssh_port();
1.463 djm 1204: channel_set_af(ssh, options.address_family);
1.196 djm 1205:
1.383 djm 1206: /* Tidy and check options */
1207: if (options.host_key_alias != NULL)
1208: lowercase(options.host_key_alias);
1209: if (options.proxy_command != NULL &&
1210: strcmp(options.proxy_command, "-") == 0 &&
1211: options.proxy_use_fdpass)
1212: fatal("ProxyCommand=- and ProxyUseFDPass are incompatible");
1.415 djm 1213: if (options.control_persist &&
1214: options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK) {
1215: debug("UpdateHostKeys=ask is incompatible with ControlPersist; "
1216: "disabling");
1217: options.update_hostkeys = 0;
1218: }
1.430 djm 1219: if (options.connection_attempts <= 0)
1220: fatal("Invalid number of ConnectionAttempts");
1221:
1.482 markus 1222: if (sshbuf_len(command) != 0 && options.remote_command != NULL)
1.461 bluhm 1223: fatal("Cannot execute command-line and remote command.");
1224:
1225: /* Cannot fork to background if no command. */
1.482 markus 1226: if (fork_after_authentication_flag && sshbuf_len(command) == 0 &&
1.461 bluhm 1227: options.remote_command == NULL && !no_shell_flag)
1228: fatal("Cannot fork into background without a command "
1229: "to execute.");
1230:
1.31 markus 1231: /* reinit */
1.452 dtucker 1232: log_init(argv0, options.log_level, options.log_facility, !use_syslog);
1.370 djm 1233:
1234: if (options.request_tty == REQUEST_TTY_YES ||
1235: options.request_tty == REQUEST_TTY_FORCE)
1236: tty_flag = 1;
1237:
1238: /* Allocate a tty by default if no command specified. */
1.482 markus 1239: if (sshbuf_len(command) == 0 && options.remote_command == NULL)
1.370 djm 1240: tty_flag = options.request_tty != REQUEST_TTY_NO;
1241:
1242: /* Force no tty */
1.447 markus 1243: if (options.request_tty == REQUEST_TTY_NO ||
1244: (muxclient_command && muxclient_command != SSHMUX_COMMAND_PROXY))
1.370 djm 1245: tty_flag = 0;
1246: /* Do not allocate a tty if stdin is not a tty. */
1247: if ((!isatty(fileno(stdin)) || stdin_null_flag) &&
1248: options.request_tty != REQUEST_TTY_FORCE) {
1249: if (tty_flag)
1250: logit("Pseudo-terminal will not be allocated because "
1251: "stdin is not a terminal.");
1252: tty_flag = 0;
1253: }
1.31 markus 1254:
1255: if (options.user == NULL)
1256: options.user = xstrdup(pw->pw_name);
1.343 djm 1257:
1.466 djm 1258: /* Set up strings used to percent_expand() arguments */
1.358 djm 1259: if (gethostname(thishost, sizeof(thishost)) == -1)
1260: fatal("gethostname: %s", strerror(errno));
1261: strlcpy(shorthost, thishost, sizeof(shorthost));
1262: shorthost[strcspn(thishost, ".")] = '\0';
1263: snprintf(portstr, sizeof(portstr), "%d", options.port);
1.479 djm 1264: snprintf(uidstr, sizeof(uidstr), "%llu",
1265: (unsigned long long)pw->pw_uid);
1.358 djm 1266:
1.405 djm 1267: if ((md = ssh_digest_start(SSH_DIGEST_SHA1)) == NULL ||
1268: ssh_digest_update(md, thishost, strlen(thishost)) < 0 ||
1269: ssh_digest_update(md, host, strlen(host)) < 0 ||
1270: ssh_digest_update(md, portstr, strlen(portstr)) < 0 ||
1271: ssh_digest_update(md, options.user, strlen(options.user)) < 0 ||
1272: ssh_digest_final(md, conn_hash, sizeof(conn_hash)) < 0)
1273: fatal("%s: mux digest failed", __func__);
1274: ssh_digest_free(md);
1275: conn_hash_hex = tohex(conn_hash, ssh_digest_bytes(SSH_DIGEST_SHA1));
1276:
1.466 djm 1277: /*
1278: * Expand tokens in arguments. NB. LocalCommand is expanded later,
1279: * after port-forwarding is set up, so it may pick up any local
1280: * tunnel interface name allocated.
1281: */
1.461 bluhm 1282: if (options.remote_command != NULL) {
1283: debug3("expanding RemoteCommand: %s", options.remote_command);
1284: cp = options.remote_command;
1285: options.remote_command = percent_expand(cp,
1286: "C", conn_hash_hex,
1287: "L", shorthost,
1288: "d", pw->pw_dir,
1289: "h", host,
1.479 djm 1290: "i", uidstr,
1.461 bluhm 1291: "l", thishost,
1292: "n", host_arg,
1293: "p", portstr,
1294: "r", options.user,
1295: "u", pw->pw_name,
1296: (char *)NULL);
1297: debug3("expanded RemoteCommand: %s", options.remote_command);
1298: free(cp);
1.482 markus 1299: if ((r = sshbuf_put(command, options.remote_command,
1300: strlen(options.remote_command))) != 0)
1301: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.304 dtucker 1302: }
1.31 markus 1303:
1.214 djm 1304: if (options.control_path != NULL) {
1.490 dtucker 1305: cp = tilde_expand_filename(options.control_path, getuid());
1.378 djm 1306: free(options.control_path);
1.405 djm 1307: options.control_path = percent_expand(cp,
1308: "C", conn_hash_hex,
1309: "L", shorthost,
1310: "h", host,
1.479 djm 1311: "i", uidstr,
1.405 djm 1312: "l", thishost,
1313: "n", host_arg,
1314: "p", portstr,
1315: "r", options.user,
1316: "u", pw->pw_name,
1.423 djm 1317: "i", uidstr,
1.358 djm 1318: (char *)NULL);
1.378 djm 1319: free(cp);
1.214 djm 1320: }
1.408 djm 1321:
1322: if (config_test) {
1323: dump_client_config(&options, host);
1324: exit(0);
1325: }
1.405 djm 1326:
1.312 djm 1327: if (muxclient_command != 0 && options.control_path == NULL)
1.240 djm 1328: fatal("No ControlPath specified for \"-O\" command");
1.447 markus 1329: if (options.control_path != NULL) {
1330: int sock;
1331: if ((sock = muxclient(options.control_path)) >= 0) {
1.463 djm 1332: ssh_packet_set_connection(ssh, sock, sock);
1.447 markus 1333: packet_set_mux();
1334: goto skip_connect;
1335: }
1336: }
1.401 djm 1337:
1338: /*
1339: * If hostname canonicalisation was not enabled, then we may not
1340: * have yet resolved the hostname. Do so now.
1341: */
1342: if (addrs == NULL && options.proxy_command == NULL) {
1.421 djm 1343: debug2("resolving \"%s\" port %d", host, options.port);
1.401 djm 1344: if ((addrs = resolve_host(host, options.port, 1,
1345: cname, sizeof(cname))) == NULL)
1346: cleanup_exit(255); /* resolve_host logs the error */
1347: }
1.214 djm 1348:
1.303 djm 1349: timeout_ms = options.connection_timeout * 1000;
1350:
1.77 markus 1351: /* Open a connection to the remote host. */
1.463 djm 1352: if (ssh_connect(ssh, host, addrs, &hostaddr, options.port,
1.385 djm 1353: options.address_family, options.connection_attempts,
1.488 dtucker 1354: &timeout_ms, options.tcp_keep_alive) != 0)
1.257 dtucker 1355: exit(255);
1.31 markus 1356:
1.391 djm 1357: if (addrs != NULL)
1358: freeaddrinfo(addrs);
1359:
1.385 djm 1360: packet_set_timeout(options.server_alive_interval,
1361: options.server_alive_count_max);
1362:
1.437 djm 1363: ssh = active_state; /* XXX */
1364:
1.303 djm 1365: if (timeout_ms > 0)
1366: debug3("timeout: %d ms remain after connect", timeout_ms);
1367:
1.33 markus 1368: /*
1.485 dtucker 1369: * If we successfully made the connection and we have hostbased auth
1370: * enabled, load the public keys so we can later use the ssh-keysign
1371: * helper to sign challenges.
1.33 markus 1372: */
1.112 markus 1373: sensitive_data.nkeys = 0;
1374: sensitive_data.keys = NULL;
1.457 djm 1375: if (options.hostbased_authentication) {
1.486 dtucker 1376: sensitive_data.nkeys = 10;
1.274 deraadt 1377: sensitive_data.keys = xcalloc(sensitive_data.nkeys,
1.483 markus 1378: sizeof(struct sshkey));
1379:
1380: /* XXX check errors? */
1.486 dtucker 1381: #define L_PUBKEY(p,o) do { \
1382: if ((o) >= sensitive_data.nkeys) \
1383: fatal("%s pubkey out of array bounds", __func__); \
1.483 markus 1384: check_load(sshkey_load_public(p, &(sensitive_data.keys[o]), NULL), \
1.486 dtucker 1385: p, "pubkey"); \
1386: } while (0)
1387: #define L_CERT(p,o) do { \
1388: if ((o) >= sensitive_data.nkeys) \
1389: fatal("%s cert out of array bounds", __func__); \
1390: check_load(sshkey_load_cert(p, &(sensitive_data.keys[o])), p, "cert"); \
1391: } while (0)
1.177 markus 1392:
1.485 dtucker 1393: if (options.hostbased_authentication == 1) {
1.486 dtucker 1394: L_CERT(_PATH_HOST_ECDSA_KEY_FILE, 0);
1395: L_CERT(_PATH_HOST_ED25519_KEY_FILE, 1);
1396: L_CERT(_PATH_HOST_RSA_KEY_FILE, 2);
1397: L_CERT(_PATH_HOST_DSA_KEY_FILE, 3);
1398: L_PUBKEY(_PATH_HOST_ECDSA_KEY_FILE, 4);
1399: L_PUBKEY(_PATH_HOST_ED25519_KEY_FILE, 5);
1400: L_PUBKEY(_PATH_HOST_RSA_KEY_FILE, 6);
1401: L_PUBKEY(_PATH_HOST_DSA_KEY_FILE, 7);
1402: L_CERT(_PATH_HOST_XMSS_KEY_FILE, 8);
1403: L_PUBKEY(_PATH_HOST_XMSS_KEY_FILE, 9);
1.173 markus 1404: }
1.31 markus 1405: }
1406:
1.487 dtucker 1407: /* Create ~/.ssh * directory if it doesn't already exist. */
1.367 djm 1408: if (config == NULL) {
1409: r = snprintf(buf, sizeof buf, "%s%s%s", pw->pw_dir,
1410: strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR);
1411: if (r > 0 && (size_t)r < sizeof(buf) && stat(buf, &st) < 0)
1412: if (mkdir(buf, 0700) < 0)
1413: error("Could not create directory '%.200s'.",
1414: buf);
1415: }
1.31 markus 1416:
1.104 markus 1417: /* load options.identity_files */
1.466 djm 1418: load_public_identity_files(pw);
1.439 markus 1419:
1.476 djm 1420: /* optionally set the SSH_AUTHSOCKET_ENV_NAME variable */
1.440 markus 1421: if (options.identity_agent &&
1422: strcmp(options.identity_agent, SSH_AUTHSOCKET_ENV_NAME) != 0) {
1.439 markus 1423: if (strcmp(options.identity_agent, "none") == 0) {
1424: unsetenv(SSH_AUTHSOCKET_ENV_NAME);
1425: } else {
1426: p = tilde_expand_filename(options.identity_agent,
1.490 dtucker 1427: getuid());
1.479 djm 1428: cp = percent_expand(p,
1429: "d", pw->pw_dir,
1430: "h", host,
1431: "i", uidstr,
1432: "l", thishost,
1433: "r", options.user,
1434: "u", pw->pw_name,
1435: (char *)NULL);
1.494 djm 1436: free(p);
1437: /*
1438: * If identity_agent represents an environment variable
1439: * then recheck that it is valid (since processing with
1440: * percent_expand() may have changed it) and substitute
1441: * its value.
1442: */
1443: if (cp[0] == '$') {
1444: if (!valid_env_name(cp + 1)) {
1445: fatal("Invalid IdentityAgent "
1446: "environment variable name %s", cp);
1447: }
1448: if ((p = getenv(cp + 1)) == NULL)
1449: unsetenv(SSH_AUTHSOCKET_ENV_NAME);
1450: else
1451: setenv(SSH_AUTHSOCKET_ENV_NAME, p, 1);
1452: } else {
1453: /* identity_agent specifies a path directly */
1454: setenv(SSH_AUTHSOCKET_ENV_NAME, cp, 1);
1455: }
1.439 markus 1456: free(cp);
1457: }
1458: }
1.104 markus 1459:
1460: /* Expand ~ in known host file names. */
1.361 djm 1461: tilde_expand_paths(options.system_hostfiles,
1462: options.num_system_hostfiles);
1463: tilde_expand_paths(options.user_hostfiles, options.num_user_hostfiles);
1.149 markus 1464:
1465: signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
1.352 djm 1466: signal(SIGCHLD, main_sigchld_handler);
1.31 markus 1467:
1.316 djm 1468: /* Log into the remote system. Never returns if the login fails. */
1.497 djm 1469: ssh_login(ssh, &sensitive_data, host, (struct sockaddr *)&hostaddr,
1.355 djm 1470: options.port, pw, timeout_ms);
1.339 djm 1471:
1472: if (packet_connection_is_on_socket()) {
1473: verbose("Authenticated to %s ([%s]:%d).", host,
1.437 djm 1474: ssh_remote_ipaddr(ssh), ssh_remote_port(ssh));
1.339 djm 1475: } else {
1476: verbose("Authenticated to %s (via proxy).", host);
1477: }
1.31 markus 1478:
1.112 markus 1479: /* We no longer need the private host keys. Clear them now. */
1480: if (sensitive_data.nkeys != 0) {
1481: for (i = 0; i < sensitive_data.nkeys; i++) {
1482: if (sensitive_data.keys[i] != NULL) {
1483: /* Destroys contents safely */
1484: debug3("clear hostkey %d", i);
1.483 markus 1485: sshkey_free(sensitive_data.keys[i]);
1.112 markus 1486: sensitive_data.keys[i] = NULL;
1487: }
1488: }
1.378 djm 1489: free(sensitive_data.keys);
1.134 markus 1490: }
1491: for (i = 0; i < options.num_identity_files; i++) {
1.378 djm 1492: free(options.identity_files[i]);
1493: options.identity_files[i] = NULL;
1.134 markus 1494: if (options.identity_keys[i]) {
1.483 markus 1495: sshkey_free(options.identity_keys[i]);
1.134 markus 1496: options.identity_keys[i] = NULL;
1497: }
1.112 markus 1498: }
1.426 djm 1499: for (i = 0; i < options.num_certificate_files; i++) {
1500: free(options.certificate_files[i]);
1501: options.certificate_files[i] = NULL;
1502: }
1.31 markus 1503:
1.447 markus 1504: skip_connect:
1.466 djm 1505: exit_status = ssh_session2(ssh, pw);
1.45 markus 1506: packet_close();
1.186 djm 1507:
1.312 djm 1508: if (options.control_path != NULL && muxserver_sock != -1)
1.214 djm 1509: unlink(options.control_path);
1510:
1.353 djm 1511: /* Kill ProxyCommand if it is running. */
1512: ssh_kill_proxy_command();
1.186 djm 1513:
1.45 markus 1514: return exit_status;
1515: }
1516:
1.344 djm 1517: static void
1518: control_persist_detach(void)
1519: {
1520: pid_t pid;
1.438 djm 1521: int devnull, keep_stderr;
1.344 djm 1522:
1523: debug("%s: backgrounding master process", __func__);
1524:
1.473 djm 1525: /*
1526: * master (current process) into the background, and make the
1527: * foreground process a client of the backgrounded master.
1528: */
1.344 djm 1529: switch ((pid = fork())) {
1530: case -1:
1531: fatal("%s: fork: %s", __func__, strerror(errno));
1532: case 0:
1533: /* Child: master process continues mainloop */
1.473 djm 1534: break;
1535: default:
1.344 djm 1536: /* Parent: set up mux slave to connect to backgrounded master */
1537: debug2("%s: background process is %ld", __func__, (long)pid);
1538: stdin_null_flag = ostdin_null_flag;
1.359 djm 1539: options.request_tty = orequest_tty;
1.344 djm 1540: tty_flag = otty_flag;
1.473 djm 1541: close(muxserver_sock);
1542: muxserver_sock = -1;
1.351 markus 1543: options.control_master = SSHCTL_MASTER_NO;
1.473 djm 1544: muxclient(options.control_path);
1.344 djm 1545: /* muxclient() doesn't return on success. */
1.473 djm 1546: fatal("Failed to connect to new control master");
1547: }
1.346 djm 1548: if ((devnull = open(_PATH_DEVNULL, O_RDWR)) == -1) {
1549: error("%s: open(\"/dev/null\"): %s", __func__,
1550: strerror(errno));
1551: } else {
1.438 djm 1552: keep_stderr = log_is_on_stderr() && debug_flag;
1.346 djm 1553: if (dup2(devnull, STDIN_FILENO) == -1 ||
1.438 djm 1554: dup2(devnull, STDOUT_FILENO) == -1 ||
1555: (!keep_stderr && dup2(devnull, STDERR_FILENO) == -1))
1.346 djm 1556: error("%s: dup2: %s", __func__, strerror(errno));
1557: if (devnull > STDERR_FILENO)
1558: close(devnull);
1559: }
1.381 djm 1560: daemon(1, 1);
1.362 djm 1561: setproctitle("%s [mux]", options.control_path);
1.344 djm 1562: }
1563:
1564: /* Do fork() after authentication. Used by "ssh -f" */
1565: static void
1566: fork_postauth(void)
1567: {
1568: if (need_controlpersist_detach)
1569: control_persist_detach();
1570: debug("forking to background");
1571: fork_after_authentication_flag = 0;
1572: if (daemon(1, 1) < 0)
1573: fatal("daemon() failed: %.200s", strerror(errno));
1574: }
1575:
1.315 djm 1576: /* Callback for remote forward global requests */
1577: static void
1.463 djm 1578: ssh_confirm_remote_forward(struct ssh *ssh, int type, u_int32_t seq, void *ctxt)
1.315 djm 1579: {
1.406 millert 1580: struct Forward *rfwd = (struct Forward *)ctxt;
1.315 djm 1581:
1.324 djm 1582: /* XXX verbose() on failure? */
1.404 markus 1583: debug("remote forward %s for: listen %s%s%d, connect %s:%d",
1.315 djm 1584: type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
1.406 millert 1585: rfwd->listen_path ? rfwd->listen_path :
1586: rfwd->listen_host ? rfwd->listen_host : "",
1587: (rfwd->listen_path || rfwd->listen_host) ? ":" : "",
1588: rfwd->listen_port, rfwd->connect_path ? rfwd->connect_path :
1589: rfwd->connect_host, rfwd->connect_port);
1590: if (rfwd->listen_path == NULL && rfwd->listen_port == 0) {
1.366 markus 1591: if (type == SSH2_MSG_REQUEST_SUCCESS) {
1592: rfwd->allocated_port = packet_get_int();
1593: logit("Allocated port %u for remote forward to %s:%d",
1594: rfwd->allocated_port,
1595: rfwd->connect_host, rfwd->connect_port);
1.480 djm 1596: channel_update_permission(ssh,
1.463 djm 1597: rfwd->handle, rfwd->allocated_port);
1.366 markus 1598: } else {
1.480 djm 1599: channel_update_permission(ssh, rfwd->handle, -1);
1.366 markus 1600: }
1.324 djm 1601: }
1.468 djm 1602:
1.315 djm 1603: if (type == SSH2_MSG_REQUEST_FAILURE) {
1.406 millert 1604: if (options.exit_on_forward_failure) {
1605: if (rfwd->listen_path != NULL)
1606: fatal("Error: remote port forwarding failed "
1607: "for listen path %s", rfwd->listen_path);
1608: else
1609: fatal("Error: remote port forwarding failed "
1610: "for listen port %d", rfwd->listen_port);
1611: } else {
1612: if (rfwd->listen_path != NULL)
1613: logit("Warning: remote port forwarding failed "
1614: "for listen path %s", rfwd->listen_path);
1615: else
1616: logit("Warning: remote port forwarding failed "
1617: "for listen port %d", rfwd->listen_port);
1618: }
1.315 djm 1619: }
1.318 djm 1620: if (++remote_forward_confirms_received == options.num_remote_forwards) {
1.315 djm 1621: debug("All remote forwarding requests processed");
1.344 djm 1622: if (fork_after_authentication_flag)
1623: fork_postauth();
1.318 djm 1624: }
1.315 djm 1625: }
1626:
1.126 itojun 1627: static void
1.463 djm 1628: client_cleanup_stdio_fwd(struct ssh *ssh, int id, void *arg)
1.331 dtucker 1629: {
1630: debug("stdio forwarding: done");
1631: cleanup_exit(0);
1632: }
1633:
1.368 djm 1634: static void
1.463 djm 1635: ssh_stdio_confirm(struct ssh *ssh, int id, int success, void *arg)
1.407 djm 1636: {
1637: if (!success)
1638: fatal("stdio forwarding failed");
1639: }
1640:
1641: static void
1.463 djm 1642: ssh_init_stdio_forwarding(struct ssh *ssh)
1.331 dtucker 1643: {
1644: Channel *c;
1.332 djm 1645: int in, out;
1.331 dtucker 1646:
1.441 dtucker 1647: if (options.stdio_forward_host == NULL)
1.368 djm 1648: return;
1649:
1.441 dtucker 1650: debug3("%s: %s:%d", __func__, options.stdio_forward_host,
1651: options.stdio_forward_port);
1.332 djm 1652:
1.368 djm 1653: if ((in = dup(STDIN_FILENO)) < 0 ||
1654: (out = dup(STDOUT_FILENO)) < 0)
1.332 djm 1655: fatal("channel_connect_stdio_fwd: dup() in/out failed");
1.463 djm 1656: if ((c = channel_connect_stdio_fwd(ssh, options.stdio_forward_host,
1.441 dtucker 1657: options.stdio_forward_port, in, out)) == NULL)
1.368 djm 1658: fatal("%s: channel_connect_stdio_fwd failed", __func__);
1.463 djm 1659: channel_register_cleanup(ssh, c->self, client_cleanup_stdio_fwd, 0);
1660: channel_register_open_confirm(ssh, c->self, ssh_stdio_confirm, NULL);
1.331 dtucker 1661: }
1662:
1663: static void
1.466 djm 1664: ssh_init_forwarding(struct ssh *ssh, char **ifname)
1.70 markus 1665: {
1.86 markus 1666: int success = 0;
1.70 markus 1667: int i;
1.331 dtucker 1668:
1.70 markus 1669: /* Initiate local TCP/IP port forwardings. */
1670: for (i = 0; i < options.num_local_forwards; i++) {
1.232 djm 1671: debug("Local connections to %.200s:%d forwarded to remote "
1672: "address %.200s:%d",
1.406 millert 1673: (options.local_forwards[i].listen_path != NULL) ?
1674: options.local_forwards[i].listen_path :
1.234 deraadt 1675: (options.local_forwards[i].listen_host == NULL) ?
1.406 millert 1676: (options.fwd_opts.gateway_ports ? "*" : "LOCALHOST") :
1.232 djm 1677: options.local_forwards[i].listen_host,
1678: options.local_forwards[i].listen_port,
1.406 millert 1679: (options.local_forwards[i].connect_path != NULL) ?
1680: options.local_forwards[i].connect_path :
1.232 djm 1681: options.local_forwards[i].connect_host,
1682: options.local_forwards[i].connect_port);
1.463 djm 1683: success += channel_setup_local_fwd_listener(ssh,
1.406 millert 1684: &options.local_forwards[i], &options.fwd_opts);
1.70 markus 1685: }
1.283 markus 1686: if (i > 0 && success != i && options.exit_on_forward_failure)
1687: fatal("Could not request local forwarding.");
1.86 markus 1688: if (i > 0 && success == 0)
1689: error("Could not request local forwarding.");
1.70 markus 1690:
1691: /* Initiate remote TCP/IP port forwardings. */
1692: for (i = 0; i < options.num_remote_forwards; i++) {
1.232 djm 1693: debug("Remote connections from %.200s:%d forwarded to "
1694: "local address %.200s:%d",
1.406 millert 1695: (options.remote_forwards[i].listen_path != NULL) ?
1696: options.remote_forwards[i].listen_path :
1.248 djm 1697: (options.remote_forwards[i].listen_host == NULL) ?
1.253 djm 1698: "LOCALHOST" : options.remote_forwards[i].listen_host,
1.232 djm 1699: options.remote_forwards[i].listen_port,
1.406 millert 1700: (options.remote_forwards[i].connect_path != NULL) ?
1701: options.remote_forwards[i].connect_path :
1.232 djm 1702: options.remote_forwards[i].connect_host,
1703: options.remote_forwards[i].connect_port);
1.366 markus 1704: options.remote_forwards[i].handle =
1.463 djm 1705: channel_request_remote_forwarding(ssh,
1.406 millert 1706: &options.remote_forwards[i]);
1.366 markus 1707: if (options.remote_forwards[i].handle < 0) {
1.283 markus 1708: if (options.exit_on_forward_failure)
1709: fatal("Could not request remote forwarding.");
1710: else
1711: logit("Warning: Could not request remote "
1712: "forwarding.");
1.366 markus 1713: } else {
1.463 djm 1714: client_register_global_confirm(
1715: ssh_confirm_remote_forward,
1.366 markus 1716: &options.remote_forwards[i]);
1.283 markus 1717: }
1.70 markus 1718: }
1.301 djm 1719:
1720: /* Initiate tunnel forwarding. */
1721: if (options.tun_open != SSH_TUNMODE_NO) {
1.466 djm 1722: if ((*ifname = client_request_tun_fwd(ssh,
1723: options.tun_open, options.tun_local,
1724: options.tun_remote)) == NULL) {
1.301 djm 1725: if (options.exit_on_forward_failure)
1726: fatal("Could not request tunnel forwarding.");
1727: else
1728: error("Could not request tunnel forwarding.");
1729: }
1.468 djm 1730: }
1.70 markus 1731: }
1732:
1.126 itojun 1733: static void
1.70 markus 1734: check_agent_present(void)
1735: {
1.412 djm 1736: int r;
1737:
1.70 markus 1738: if (options.forward_agent) {
1.254 djm 1739: /* Clear agent forwarding if we don't have an agent. */
1.412 djm 1740: if ((r = ssh_get_authentication_socket(NULL)) != 0) {
1.70 markus 1741: options.forward_agent = 0;
1.412 djm 1742: if (r != SSH_ERR_AGENT_NOT_PRESENT)
1743: debug("ssh_get_authentication_socket: %s",
1744: ssh_err(r));
1745: }
1.70 markus 1746: }
1747: }
1748:
1.214 djm 1749: static void
1.463 djm 1750: ssh_session2_setup(struct ssh *ssh, int id, int success, void *arg)
1.214 djm 1751: {
1.215 djm 1752: extern char **environ;
1.243 djm 1753: const char *display;
1754: int interactive = tty_flag;
1.433 djm 1755: char *proto = NULL, *data = NULL;
1.337 djm 1756:
1757: if (!success)
1758: return; /* No need for error message, channels code sens one */
1.215 djm 1759:
1.248 djm 1760: display = getenv("DISPLAY");
1.417 djm 1761: if (display == NULL && options.forward_x11)
1762: debug("X11 forwarding requested but DISPLAY not set");
1.463 djm 1763: if (options.forward_x11 && client_x11_get_proto(ssh, display,
1.433 djm 1764: options.xauth_location, options.forward_x11_trusted,
1765: options.forward_x11_timeout, &proto, &data) == 0) {
1.50 markus 1766: /* Request forwarding with authentication spoofing. */
1.316 djm 1767: debug("Requesting X11 forwarding with authentication "
1768: "spoofing.");
1.463 djm 1769: x11_request_forwarding_with_spoofing(ssh, id, display, proto,
1.363 djm 1770: data, 1);
1.463 djm 1771: client_expect_confirm(ssh, id, "X11 forwarding", CONFIRM_WARN);
1.363 djm 1772: /* XXX exit_on_forward_failure */
1.80 markus 1773: interactive = 1;
1.50 markus 1774: }
1775:
1.70 markus 1776: check_agent_present();
1777: if (options.forward_agent) {
1778: debug("Requesting authentication agent forwarding.");
1.463 djm 1779: channel_request_start(ssh, id, "auth-agent-req@openssh.com", 0);
1.70 markus 1780: packet_send();
1.212 djm 1781: }
1.369 dtucker 1782:
1783: /* Tell the packet module whether this is an interactive session. */
1784: packet_set_interactive(interactive,
1785: options.ip_qos_interactive, options.ip_qos_bulk);
1.212 djm 1786:
1.463 djm 1787: client_session2_setup(ssh, id, tty_flag, subsystem_flag, getenv("TERM"),
1.482 markus 1788: NULL, fileno(stdin), command, environ);
1.45 markus 1789: }
1790:
1.143 markus 1791: /* open new channel for a session */
1.126 itojun 1792: static int
1.463 djm 1793: ssh_session2_open(struct ssh *ssh)
1.45 markus 1794: {
1.118 markus 1795: Channel *c;
1796: int window, packetmax, in, out, err;
1.60 markus 1797:
1.62 markus 1798: if (stdin_null_flag) {
1.93 itojun 1799: in = open(_PATH_DEVNULL, O_RDONLY);
1.62 markus 1800: } else {
1801: in = dup(STDIN_FILENO);
1802: }
1.60 markus 1803: out = dup(STDOUT_FILENO);
1804: err = dup(STDERR_FILENO);
1.45 markus 1805:
1806: if (in < 0 || out < 0 || err < 0)
1.62 markus 1807: fatal("dup() in/out/err failed");
1.45 markus 1808:
1.69 markus 1809: /* enable nonblocking unless tty */
1810: if (!isatty(in))
1811: set_nonblock(in);
1812: if (!isatty(out))
1813: set_nonblock(out);
1814: if (!isatty(err))
1815: set_nonblock(err);
1816:
1.65 markus 1817: window = CHAN_SES_WINDOW_DEFAULT;
1818: packetmax = CHAN_SES_PACKET_DEFAULT;
1.164 markus 1819: if (tty_flag) {
1820: window >>= 1;
1821: packetmax >>= 1;
1.45 markus 1822: }
1.463 djm 1823: c = channel_new(ssh,
1.45 markus 1824: "session", SSH_CHANNEL_OPENING, in, out, err,
1.65 markus 1825: window, packetmax, CHAN_EXTENDED_WRITE,
1.192 markus 1826: "client-session", /*nonblock*/0);
1.45 markus 1827:
1.463 djm 1828: debug3("%s: channel_new: %d", __func__, c->self);
1.106 markus 1829:
1.463 djm 1830: channel_send_open(ssh, c->self);
1.143 markus 1831: if (!no_shell_flag)
1.463 djm 1832: channel_register_open_confirm(ssh, c->self,
1.310 djm 1833: ssh_session2_setup, NULL);
1.106 markus 1834:
1.118 markus 1835: return c->self;
1.106 markus 1836: }
1837:
1.126 itojun 1838: static int
1.466 djm 1839: ssh_session2(struct ssh *ssh, struct passwd *pw)
1.106 markus 1840: {
1.467 djm 1841: int devnull, id = -1;
1.466 djm 1842: char *cp, *tun_fwd_ifname = NULL;
1.106 markus 1843:
1844: /* XXX should be pre-session */
1.368 djm 1845: if (!options.control_persist)
1.463 djm 1846: ssh_init_stdio_forwarding(ssh);
1.466 djm 1847:
1848: ssh_init_forwarding(ssh, &tun_fwd_ifname);
1849:
1850: if (options.local_command != NULL) {
1851: debug3("expanding LocalCommand: %s", options.local_command);
1852: cp = options.local_command;
1853: options.local_command = percent_expand(cp,
1854: "C", conn_hash_hex,
1855: "L", shorthost,
1856: "d", pw->pw_dir,
1857: "h", host,
1.479 djm 1858: "i", uidstr,
1.466 djm 1859: "l", thishost,
1860: "n", host_arg,
1861: "p", portstr,
1862: "r", options.user,
1863: "u", pw->pw_name,
1864: "T", tun_fwd_ifname == NULL ? "NONE" : tun_fwd_ifname,
1865: (char *)NULL);
1866: debug3("expanded LocalCommand: %s", options.local_command);
1867: free(cp);
1868: }
1.106 markus 1869:
1.344 djm 1870: /* Start listening for multiplex clients */
1.447 markus 1871: if (!packet_get_mux())
1.463 djm 1872: muxserver_listen(ssh);
1.344 djm 1873:
1.473 djm 1874: /*
1.368 djm 1875: * If we are in control persist mode and have a working mux listen
1876: * socket, then prepare to background ourselves and have a foreground
1877: * client attach as a control slave.
1878: * NB. we must save copies of the flags that we override for
1.344 djm 1879: * the backgrounding, since we defer attachment of the slave until
1880: * after the connection is fully established (in particular,
1881: * async rfwd replies have been received for ExitOnForwardFailure).
1882: */
1.473 djm 1883: if (options.control_persist && muxserver_sock != -1) {
1.344 djm 1884: ostdin_null_flag = stdin_null_flag;
1885: ono_shell_flag = no_shell_flag;
1.359 djm 1886: orequest_tty = options.request_tty;
1.344 djm 1887: otty_flag = tty_flag;
1.473 djm 1888: stdin_null_flag = 1;
1889: no_shell_flag = 1;
1890: tty_flag = 0;
1.344 djm 1891: if (!fork_after_authentication_flag)
1892: need_controlpersist_detach = 1;
1893: fork_after_authentication_flag = 1;
1.473 djm 1894: }
1.368 djm 1895: /*
1896: * ControlPersist mux listen socket setup failed, attempt the
1897: * stdio forward setup that we skipped earlier.
1898: */
1899: if (options.control_persist && muxserver_sock == -1)
1.463 djm 1900: ssh_init_stdio_forwarding(ssh);
1.344 djm 1901:
1.471 djm 1902: if (!no_shell_flag)
1.463 djm 1903: id = ssh_session2_open(ssh);
1.379 djm 1904: else {
1905: packet_set_interactive(
1906: options.control_master == SSHCTL_MASTER_NO,
1907: options.ip_qos_interactive, options.ip_qos_bulk);
1908: }
1.314 djm 1909:
1910: /* If we don't expect to open a new session, then disallow it */
1.319 markus 1911: if (options.control_master == SSHCTL_MASTER_NO &&
1912: (datafellows & SSH_NEW_OPENSSH)) {
1.314 djm 1913: debug("Requesting no-more-sessions@openssh.com");
1914: packet_start(SSH2_MSG_GLOBAL_REQUEST);
1915: packet_put_cstring("no-more-sessions@openssh.com");
1916: packet_put_char(0);
1917: packet_send();
1918: }
1.255 reyk 1919:
1920: /* Execute a local command */
1921: if (options.local_command != NULL &&
1922: options.permit_local_command)
1923: ssh_local_cmd(options.local_command);
1.467 djm 1924:
1925: /*
1926: * stdout is now owned by the session channel; clobber it here
1927: * so future channel closes are propagated to the local fd.
1928: * NB. this can only happen after LocalCommand has completed,
1929: * as it may want to write to stdout.
1930: */
1.469 djm 1931: if (!need_controlpersist_detach) {
1932: if ((devnull = open(_PATH_DEVNULL, O_WRONLY)) == -1)
1933: error("%s: open %s: %s", __func__,
1934: _PATH_DEVNULL, strerror(errno));
1935: if (dup2(devnull, STDOUT_FILENO) < 0)
1936: fatal("%s: dup2() stdout failed", __func__);
1937: if (devnull > STDERR_FILENO)
1938: close(devnull);
1939: }
1.301 djm 1940:
1.342 djm 1941: /*
1942: * If requested and we are not interested in replies to remote
1943: * forwarding requests, then let ssh continue in the background.
1944: */
1.344 djm 1945: if (fork_after_authentication_flag) {
1946: if (options.exit_on_forward_failure &&
1947: options.num_remote_forwards > 0) {
1948: debug("deferring postauth fork until remote forward "
1949: "confirmation received");
1950: } else
1951: fork_postauth();
1.318 djm 1952: }
1.31 markus 1953:
1.463 djm 1954: return client_loop(ssh, tty_flag, tty_flag ?
1.119 stevesk 1955: options.escape_char : SSH_ESCAPECHAR_NONE, id);
1.72 markus 1956: }
1957:
1.426 djm 1958: /* Loads all IdentityFile and CertificateFile keys */
1.126 itojun 1959: static void
1.466 djm 1960: load_public_identity_files(struct passwd *pw)
1.104 markus 1961: {
1.466 djm 1962: char *filename, *cp;
1.460 markus 1963: struct sshkey *public;
1.426 djm 1964: int i;
1965: u_int n_ids, n_certs;
1.335 djm 1966: char *identity_files[SSH_MAX_IDENTITY_FILES];
1.460 markus 1967: struct sshkey *identity_keys[SSH_MAX_IDENTITY_FILES];
1.484 djm 1968: int identity_file_userprovided[SSH_MAX_IDENTITY_FILES];
1.426 djm 1969: char *certificate_files[SSH_MAX_CERTIFICATE_FILES];
1970: struct sshkey *certificates[SSH_MAX_CERTIFICATE_FILES];
1.484 djm 1971: int certificate_file_userprovided[SSH_MAX_CERTIFICATE_FILES];
1.333 markus 1972: #ifdef ENABLE_PKCS11
1.460 markus 1973: struct sshkey **keys;
1.333 markus 1974: int nkeys;
1.335 djm 1975: #endif /* PKCS11 */
1.104 markus 1976:
1.426 djm 1977: n_ids = n_certs = 0;
1.398 tedu 1978: memset(identity_files, 0, sizeof(identity_files));
1979: memset(identity_keys, 0, sizeof(identity_keys));
1.484 djm 1980: memset(identity_file_userprovided, 0,
1981: sizeof(identity_file_userprovided));
1.426 djm 1982: memset(certificate_files, 0, sizeof(certificate_files));
1983: memset(certificates, 0, sizeof(certificates));
1.484 djm 1984: memset(certificate_file_userprovided, 0,
1985: sizeof(certificate_file_userprovided));
1.335 djm 1986:
1987: #ifdef ENABLE_PKCS11
1.333 markus 1988: if (options.pkcs11_provider != NULL &&
1.167 markus 1989: options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
1.333 markus 1990: (pkcs11_init(!options.batch_mode) == 0) &&
1991: (nkeys = pkcs11_add_provider(options.pkcs11_provider, NULL,
1992: &keys)) > 0) {
1993: for (i = 0; i < nkeys; i++) {
1.335 djm 1994: if (n_ids >= SSH_MAX_IDENTITY_FILES) {
1.483 markus 1995: sshkey_free(keys[i]);
1.335 djm 1996: continue;
1997: }
1998: identity_keys[n_ids] = keys[i];
1999: identity_files[n_ids] =
1.333 markus 2000: xstrdup(options.pkcs11_provider); /* XXX */
1.335 djm 2001: n_ids++;
1.167 markus 2002: }
1.378 djm 2003: free(keys);
1.127 markus 2004: }
1.333 markus 2005: #endif /* ENABLE_PKCS11 */
1.335 djm 2006: for (i = 0; i < options.num_identity_files; i++) {
1.373 djm 2007: if (n_ids >= SSH_MAX_IDENTITY_FILES ||
2008: strcasecmp(options.identity_files[i], "none") == 0) {
1.378 djm 2009: free(options.identity_files[i]);
1.426 djm 2010: options.identity_files[i] = NULL;
1.335 djm 2011: continue;
2012: }
1.490 dtucker 2013: cp = tilde_expand_filename(options.identity_files[i], getuid());
1.466 djm 2014: filename = percent_expand(cp, "d", pw->pw_dir,
2015: "u", pw->pw_name, "l", thishost, "h", host,
1.275 djm 2016: "r", options.user, (char *)NULL);
1.378 djm 2017: free(cp);
1.483 markus 2018: check_load(sshkey_load_public(filename, &public, NULL),
2019: filename, "pubkey");
1.131 millert 2020: debug("identity file %s type %d", filename,
2021: public ? public->type : -1);
1.378 djm 2022: free(options.identity_files[i]);
1.335 djm 2023: identity_files[n_ids] = filename;
2024: identity_keys[n_ids] = public;
1.484 djm 2025: identity_file_userprovided[n_ids] =
2026: options.identity_file_userprovided[i];
1.335 djm 2027: if (++n_ids >= SSH_MAX_IDENTITY_FILES)
2028: continue;
2029:
1.426 djm 2030: /*
2031: * If no certificates have been explicitly listed then try
2032: * to add the default certificate variant too.
2033: */
2034: if (options.num_certificate_files != 0)
2035: continue;
1.335 djm 2036: xasprintf(&cp, "%s-cert", filename);
1.483 markus 2037: check_load(sshkey_load_public(cp, &public, NULL),
2038: filename, "pubkey");
1.335 djm 2039: debug("identity file %s type %d", cp,
2040: public ? public->type : -1);
2041: if (public == NULL) {
1.378 djm 2042: free(cp);
1.335 djm 2043: continue;
2044: }
1.483 markus 2045: if (!sshkey_is_cert(public)) {
1.335 djm 2046: debug("%s: key %s type %s is not a certificate",
1.483 markus 2047: __func__, cp, sshkey_type(public));
2048: sshkey_free(public);
1.378 djm 2049: free(cp);
1.335 djm 2050: continue;
2051: }
1.448 djm 2052: /* NB. leave filename pointing to private key */
2053: identity_files[n_ids] = xstrdup(filename);
1.335 djm 2054: identity_keys[n_ids] = public;
1.484 djm 2055: identity_file_userprovided[n_ids] =
2056: options.identity_file_userprovided[i];
1.335 djm 2057: n_ids++;
2058: }
1.426 djm 2059:
2060: if (options.num_certificate_files > SSH_MAX_CERTIFICATE_FILES)
2061: fatal("%s: too many certificates", __func__);
2062: for (i = 0; i < options.num_certificate_files; i++) {
2063: cp = tilde_expand_filename(options.certificate_files[i],
1.490 dtucker 2064: getuid());
1.479 djm 2065: filename = percent_expand(cp,
2066: "d", pw->pw_dir,
2067: "h", host,
1.481 djm 2068: "i", uidstr,
1.479 djm 2069: "l", thishost,
2070: "r", options.user,
2071: "u", pw->pw_name,
2072: (char *)NULL);
1.426 djm 2073: free(cp);
2074:
1.483 markus 2075: check_load(sshkey_load_public(filename, &public, NULL),
2076: filename, "certificate");
1.426 djm 2077: debug("certificate file %s type %d", filename,
2078: public ? public->type : -1);
2079: free(options.certificate_files[i]);
2080: options.certificate_files[i] = NULL;
2081: if (public == NULL) {
2082: free(filename);
2083: continue;
2084: }
1.483 markus 2085: if (!sshkey_is_cert(public)) {
1.426 djm 2086: debug("%s: key %s type %s is not a certificate",
1.483 markus 2087: __func__, filename, sshkey_type(public));
2088: sshkey_free(public);
1.426 djm 2089: free(filename);
2090: continue;
2091: }
2092: certificate_files[n_certs] = filename;
2093: certificates[n_certs] = public;
1.484 djm 2094: certificate_file_userprovided[n_certs] =
2095: options.certificate_file_userprovided[i];
1.426 djm 2096: ++n_certs;
2097: }
2098:
1.335 djm 2099: options.num_identity_files = n_ids;
2100: memcpy(options.identity_files, identity_files, sizeof(identity_files));
2101: memcpy(options.identity_keys, identity_keys, sizeof(identity_keys));
1.484 djm 2102: memcpy(options.identity_file_userprovided,
2103: identity_file_userprovided, sizeof(identity_file_userprovided));
1.426 djm 2104:
2105: options.num_certificate_files = n_certs;
2106: memcpy(options.certificate_files,
2107: certificate_files, sizeof(certificate_files));
2108: memcpy(options.certificates, certificates, sizeof(certificates));
1.484 djm 2109: memcpy(options.certificate_file_userprovided,
2110: certificate_file_userprovided,
2111: sizeof(certificate_file_userprovided));
1.214 djm 2112: }
1.352 djm 2113:
2114: static void
2115: main_sigchld_handler(int sig)
2116: {
2117: int save_errno = errno;
2118: pid_t pid;
2119: int status;
2120:
2121: while ((pid = waitpid(-1, &status, WNOHANG)) > 0 ||
2122: (pid < 0 && errno == EINTR))
2123: ;
2124: errno = save_errno;
2125: }
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