Annotation of src/usr.bin/ssh/ssh.c, Revision 1.475
1.475 ! markus 1: /* $OpenBSD: ssh.c,v 1.474 2018/02/23 02:34:33 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"
80: #include "buffer.h"
1.123 markus 81: #include "channels.h"
1.49 markus 82: #include "key.h"
1.58 markus 83: #include "authfd.h"
1.49 markus 84: #include "authfile.h"
1.83 markus 85: #include "pathnames.h"
1.214 djm 86: #include "dispatch.h"
1.81 markus 87: #include "clientloop.h"
1.84 markus 88: #include "log.h"
1.406 millert 89: #include "misc.h"
1.84 markus 90: #include "readconf.h"
91: #include "sshconnect.h"
1.95 markus 92: #include "kex.h"
93: #include "mac.h"
1.213 deraadt 94: #include "sshpty.h"
1.212 djm 95: #include "match.h"
1.214 djm 96: #include "msg.h"
1.225 dtucker 97: #include "uidswap.h"
1.278 stevesk 98: #include "version.h"
1.412 djm 99: #include "ssherr.h"
1.420 djm 100: #include "myproposal.h"
1.49 markus 101:
1.333 markus 102: #ifdef ENABLE_PKCS11
103: #include "ssh-pkcs11.h"
1.137 jakob 104: #endif
1.127 markus 105:
1.49 markus 106: extern char *__progname;
1.1 deraadt 107:
1.316 djm 108: /* Flag indicating whether debug mode is on. May be set on the command line. */
1.1 deraadt 109: int debug_flag = 0;
110:
1.359 djm 111: /* Flag indicating whether a tty should be requested */
1.1 deraadt 112: int tty_flag = 0;
113:
1.45 markus 114: /* don't exec a shell */
115: int no_shell_flag = 0;
116:
1.33 markus 117: /*
118: * Flag indicating that nothing should be read from stdin. This can be set
119: * on the command line.
120: */
1.1 deraadt 121: int stdin_null_flag = 0;
122:
1.33 markus 123: /*
1.344 djm 124: * Flag indicating that the current process should be backgrounded and
125: * a new slave launched in the foreground for ControlPersist.
126: */
127: int need_controlpersist_detach = 0;
128:
129: /* Copies of flags for ControlPersist foreground slave */
1.359 djm 130: int ostdin_null_flag, ono_shell_flag, otty_flag, orequest_tty;
1.344 djm 131:
132: /*
1.33 markus 133: * Flag indicating that ssh should fork after authentication. This is useful
1.172 deraadt 134: * so that the passphrase can be entered manually, and then ssh goes to the
1.33 markus 135: * background.
136: */
1.1 deraadt 137: int fork_after_authentication_flag = 0;
138:
1.33 markus 139: /*
140: * General data structure for command line options and options configurable
141: * in configuration files. See readconf.h.
142: */
1.1 deraadt 143: Options options;
144:
1.139 markus 145: /* optional user configfile */
146: char *config = NULL;
147:
1.33 markus 148: /*
149: * Name of the host we are connecting to. This is the name given on the
150: * command line, or the HostName specified for the user-supplied name in a
151: * configuration file.
152: */
1.1 deraadt 153: char *host;
154:
1.466 djm 155: /* Various strings used to to percent_expand() arguments */
156: static char thishost[NI_MAXHOST], shorthost[NI_MAXHOST], portstr[NI_MAXSERV];
157: static char uidstr[32], *host_arg, *conn_hash_hex;
158:
1.22 provos 159: /* socket address the host resolves to */
1.37 markus 160: struct sockaddr_storage hostaddr;
1.1 deraadt 161:
1.112 markus 162: /* Private host keys. */
1.173 markus 163: Sensitive sensitive_data;
1.1 deraadt 164:
1.10 dugsong 165: /* Original real UID. */
166: uid_t original_real_uid;
1.177 markus 167: uid_t original_effective_uid;
1.1 deraadt 168:
1.45 markus 169: /* command to be executed */
170: Buffer command;
171:
1.85 djm 172: /* Should we execute a command or invoke a subsystem? */
173: int subsystem_flag = 0;
174:
1.170 markus 175: /* # of replies received for global requests */
1.315 djm 176: static int remote_forward_confirms_received = 0;
1.170 markus 177:
1.313 djm 178: /* mux.c */
179: extern int muxserver_sock;
180: extern u_int muxclient_command;
181:
1.1 deraadt 182: /* Prints a help message to the user. This function never returns. */
183:
1.126 itojun 184: static void
1.93 itojun 185: usage(void)
1.1 deraadt 186: {
1.208 markus 187: fprintf(stderr,
1.474 djm 188: "usage: ssh [-46AaCfGgKkMNnqsTtVvXxYy] [-B bind_interface]\n"
189: " [-b bind_address] [-c cipher_spec] [-D [bind_address:]port]\n"
190: " [-E log_file] [-e escape_char] [-F configfile] [-I pkcs11]\n"
191: " [-i identity_file] [-J [user@]host[:port]] [-L address]\n"
192: " [-l login_name] [-m mac_spec] [-O ctl_cmd] [-o option] [-p port]\n"
193: " [-Q query_option] [-R address] [-S ctl_path] [-W host:port]\n"
194: " [-w local_tun[:remote_tun]] destination [command]\n"
1.208 markus 195: );
1.257 dtucker 196: exit(255);
1.1 deraadt 197: }
198:
1.466 djm 199: static int ssh_session2(struct ssh *, struct passwd *);
200: static void load_public_identity_files(struct passwd *);
1.352 djm 201: static void main_sigchld_handler(int);
1.312 djm 202:
1.361 djm 203: /* ~/ expand a list of paths. NB. assumes path[n] is heap-allocated. */
204: static void
205: tilde_expand_paths(char **paths, u_int num_paths)
206: {
207: u_int i;
208: char *cp;
209:
210: for (i = 0; i < num_paths; i++) {
211: cp = tilde_expand_filename(paths[i], original_real_uid);
1.378 djm 212: free(paths[i]);
1.361 djm 213: paths[i] = cp;
214: }
215: }
216:
1.400 djm 217: /*
218: * Attempt to resolve a host name / port to a set of addresses and
219: * optionally return any CNAMEs encountered along the way.
220: * Returns NULL on failure.
221: * NB. this function must operate with a options having undefined members.
222: */
1.385 djm 223: static struct addrinfo *
1.400 djm 224: resolve_host(const char *name, int port, int logerr, char *cname, size_t clen)
1.385 djm 225: {
226: char strport[NI_MAXSERV];
227: struct addrinfo hints, *res;
228: int gaierr, loglevel = SYSLOG_LEVEL_DEBUG1;
229:
1.400 djm 230: if (port <= 0)
231: port = default_ssh_port();
232:
1.427 djm 233: snprintf(strport, sizeof strport, "%d", port);
1.398 tedu 234: memset(&hints, 0, sizeof(hints));
1.400 djm 235: hints.ai_family = options.address_family == -1 ?
236: AF_UNSPEC : options.address_family;
1.385 djm 237: hints.ai_socktype = SOCK_STREAM;
238: if (cname != NULL)
239: hints.ai_flags = AI_CANONNAME;
240: if ((gaierr = getaddrinfo(name, strport, &hints, &res)) != 0) {
241: if (logerr || (gaierr != EAI_NONAME && gaierr != EAI_NODATA))
242: loglevel = SYSLOG_LEVEL_ERROR;
243: do_log2(loglevel, "%s: Could not resolve hostname %.100s: %s",
244: __progname, name, ssh_gai_strerror(gaierr));
245: return NULL;
246: }
247: if (cname != NULL && res->ai_canonname != NULL) {
248: if (strlcpy(cname, res->ai_canonname, clen) >= clen) {
249: error("%s: host \"%s\" cname \"%s\" too long (max %lu)",
250: __func__, name, res->ai_canonname, (u_long)clen);
251: if (clen > 0)
252: *cname = '\0';
253: }
254: }
255: return res;
256: }
257:
1.470 djm 258: /* Returns non-zero if name can only be an address and not a hostname */
259: static int
260: is_addr_fast(const char *name)
261: {
262: return (strchr(name, '%') != NULL || strchr(name, ':') != NULL ||
263: strspn(name, "0123456789.") == strlen(name));
264: }
265:
266: /* Returns non-zero if name represents a valid, single address */
267: static int
268: is_addr(const char *name)
269: {
270: char strport[NI_MAXSERV];
271: struct addrinfo hints, *res;
272:
273: if (is_addr_fast(name))
274: return 1;
275:
276: snprintf(strport, sizeof strport, "%u", default_ssh_port());
277: memset(&hints, 0, sizeof(hints));
278: hints.ai_family = options.address_family == -1 ?
279: AF_UNSPEC : options.address_family;
280: hints.ai_socktype = SOCK_STREAM;
281: hints.ai_flags = AI_NUMERICHOST|AI_NUMERICSERV;
282: if (getaddrinfo(name, strport, &hints, &res) != 0)
283: return 0;
284: if (res == NULL || res->ai_next != NULL) {
285: freeaddrinfo(res);
286: return 0;
287: }
288: freeaddrinfo(res);
289: return 1;
290: }
291:
1.385 djm 292: /*
1.413 djm 293: * Attempt to resolve a numeric host address / port to a single address.
294: * Returns a canonical address string.
295: * Returns NULL on failure.
296: * NB. this function must operate with a options having undefined members.
297: */
298: static struct addrinfo *
299: resolve_addr(const char *name, int port, char *caddr, size_t clen)
300: {
301: char addr[NI_MAXHOST], strport[NI_MAXSERV];
302: struct addrinfo hints, *res;
303: int gaierr;
304:
305: if (port <= 0)
306: port = default_ssh_port();
307: snprintf(strport, sizeof strport, "%u", port);
308: memset(&hints, 0, sizeof(hints));
309: hints.ai_family = options.address_family == -1 ?
310: AF_UNSPEC : options.address_family;
311: hints.ai_socktype = SOCK_STREAM;
312: hints.ai_flags = AI_NUMERICHOST|AI_NUMERICSERV;
313: if ((gaierr = getaddrinfo(name, strport, &hints, &res)) != 0) {
314: debug2("%s: could not resolve name %.100s as address: %s",
315: __func__, name, ssh_gai_strerror(gaierr));
316: return NULL;
317: }
318: if (res == NULL) {
319: debug("%s: getaddrinfo %.100s returned no addresses",
320: __func__, name);
321: return NULL;
322: }
323: if (res->ai_next != NULL) {
324: debug("%s: getaddrinfo %.100s returned multiple addresses",
325: __func__, name);
326: goto fail;
327: }
328: if ((gaierr = getnameinfo(res->ai_addr, res->ai_addrlen,
329: addr, sizeof(addr), NULL, 0, NI_NUMERICHOST)) != 0) {
330: debug("%s: Could not format address for name %.100s: %s",
331: __func__, name, ssh_gai_strerror(gaierr));
332: goto fail;
333: }
334: if (strlcpy(caddr, addr, clen) >= clen) {
335: error("%s: host \"%s\" addr \"%s\" too long (max %lu)",
336: __func__, name, addr, (u_long)clen);
337: if (clen > 0)
338: *caddr = '\0';
339: fail:
340: freeaddrinfo(res);
341: return NULL;
342: }
343: return res;
344: }
345:
346: /*
1.385 djm 347: * Check whether the cname is a permitted replacement for the hostname
348: * and perform the replacement if it is.
1.400 djm 349: * NB. this function must operate with a options having undefined members.
1.385 djm 350: */
351: static int
1.443 djm 352: check_follow_cname(int direct, char **namep, const char *cname)
1.385 djm 353: {
354: int i;
355: struct allowed_cname *rule;
356:
357: if (*cname == '\0' || options.num_permitted_cnames == 0 ||
358: strcmp(*namep, cname) == 0)
359: return 0;
1.386 djm 360: if (options.canonicalize_hostname == SSH_CANONICALISE_NO)
1.385 djm 361: return 0;
362: /*
1.386 djm 363: * Don't attempt to canonicalize names that will be interpreted by
1.443 djm 364: * a proxy or jump host unless the user specifically requests so.
1.385 djm 365: */
1.443 djm 366: if (!direct &&
1.386 djm 367: options.canonicalize_hostname != SSH_CANONICALISE_ALWAYS)
1.385 djm 368: return 0;
369: debug3("%s: check \"%s\" CNAME \"%s\"", __func__, *namep, cname);
370: for (i = 0; i < options.num_permitted_cnames; i++) {
371: rule = options.permitted_cnames + i;
1.418 djm 372: if (match_pattern_list(*namep, rule->source_list, 1) != 1 ||
373: match_pattern_list(cname, rule->target_list, 1) != 1)
1.385 djm 374: continue;
1.386 djm 375: verbose("Canonicalized DNS aliased hostname "
1.385 djm 376: "\"%s\" => \"%s\"", *namep, cname);
377: free(*namep);
378: *namep = xstrdup(cname);
379: return 1;
380: }
381: return 0;
382: }
383:
384: /*
385: * Attempt to resolve the supplied hostname after applying the user's
1.387 djm 386: * canonicalization rules. Returns the address list for the host or NULL
387: * if no name was found after canonicalization.
1.400 djm 388: * NB. this function must operate with a options having undefined members.
1.385 djm 389: */
390: static struct addrinfo *
1.400 djm 391: resolve_canonicalize(char **hostp, int port)
1.385 djm 392: {
1.443 djm 393: int i, direct, ndots;
1.413 djm 394: char *cp, *fullhost, newname[NI_MAXHOST];
1.385 djm 395: struct addrinfo *addrs;
396:
397: /*
1.470 djm 398: * Attempt to canonicalise addresses, regardless of
399: * whether hostname canonicalisation was requested
1.385 djm 400: */
1.413 djm 401: if ((addrs = resolve_addr(*hostp, port,
402: newname, sizeof(newname))) != NULL) {
403: debug2("%s: hostname %.100s is address", __func__, *hostp);
404: if (strcasecmp(*hostp, newname) != 0) {
405: debug2("%s: canonicalised address \"%s\" => \"%s\"",
406: __func__, *hostp, newname);
407: free(*hostp);
408: *hostp = xstrdup(newname);
409: }
410: return addrs;
411: }
412:
1.470 djm 413: /*
414: * If this looks like an address but didn't parse as one, it might
415: * be an address with an invalid interface scope. Skip further
416: * attempts at canonicalisation.
417: */
418: if (is_addr_fast(*hostp)) {
419: debug("%s: hostname %.100s is an unrecognised address",
420: __func__, *hostp);
421: return NULL;
422: }
423:
424: if (options.canonicalize_hostname == SSH_CANONICALISE_NO)
425: return NULL;
426:
427: /*
428: * Don't attempt to canonicalize names that will be interpreted by
429: * a proxy unless the user specifically requests so.
430: */
431: direct = option_clear_or_none(options.proxy_command) &&
432: options.jump_host == NULL;
433: if (!direct &&
434: options.canonicalize_hostname != SSH_CANONICALISE_ALWAYS)
435: return NULL;
436:
1.428 djm 437: /* If domain name is anchored, then resolve it now */
438: if ((*hostp)[strlen(*hostp) - 1] == '.') {
439: debug3("%s: name is fully qualified", __func__);
440: fullhost = xstrdup(*hostp);
441: if ((addrs = resolve_host(fullhost, port, 0,
442: newname, sizeof(newname))) != NULL)
443: goto found;
444: free(fullhost);
445: goto notfound;
446: }
447:
1.387 djm 448: /* Don't apply canonicalization to sufficiently-qualified hostnames */
1.385 djm 449: ndots = 0;
450: for (cp = *hostp; *cp != '\0'; cp++) {
451: if (*cp == '.')
452: ndots++;
453: }
1.386 djm 454: if (ndots > options.canonicalize_max_dots) {
455: debug3("%s: not canonicalizing hostname \"%s\" (max dots %d)",
456: __func__, *hostp, options.canonicalize_max_dots);
1.385 djm 457: return NULL;
458: }
459: /* Attempt each supplied suffix */
460: for (i = 0; i < options.num_canonical_domains; i++) {
1.413 djm 461: *newname = '\0';
1.385 djm 462: xasprintf(&fullhost, "%s.%s.", *hostp,
463: options.canonical_domains[i]);
1.400 djm 464: debug3("%s: attempting \"%s\" => \"%s\"", __func__,
465: *hostp, fullhost);
466: if ((addrs = resolve_host(fullhost, port, 0,
1.413 djm 467: newname, sizeof(newname))) == NULL) {
1.385 djm 468: free(fullhost);
469: continue;
470: }
1.428 djm 471: found:
1.385 djm 472: /* Remove trailing '.' */
473: fullhost[strlen(fullhost) - 1] = '\0';
474: /* Follow CNAME if requested */
1.443 djm 475: if (!check_follow_cname(direct, &fullhost, newname)) {
1.386 djm 476: debug("Canonicalized hostname \"%s\" => \"%s\"",
1.385 djm 477: *hostp, fullhost);
478: }
479: free(*hostp);
480: *hostp = fullhost;
481: return addrs;
482: }
1.428 djm 483: notfound:
1.386 djm 484: if (!options.canonicalize_fallback_local)
1.400 djm 485: fatal("%s: Could not resolve host \"%s\"", __progname, *hostp);
486: debug2("%s: host %s not found in any suffix", __func__, *hostp);
1.385 djm 487: return NULL;
488: }
489:
1.32 deraadt 490: /*
1.400 djm 491: * Read per-user configuration file. Ignore the system wide config
492: * file if the user specifies a config file on the command line.
493: */
494: static void
1.466 djm 495: process_config_files(const char *host_name, struct passwd *pw, int post_canon)
1.400 djm 496: {
1.414 deraadt 497: char buf[PATH_MAX];
1.400 djm 498: int r;
499:
500: if (config != NULL) {
501: if (strcasecmp(config, "none") != 0 &&
1.466 djm 502: !read_config_file(config, pw, host, host_name, &options,
1.408 djm 503: SSHCONF_USERCONF | (post_canon ? SSHCONF_POSTCANON : 0)))
1.400 djm 504: fatal("Can't open user config file %.100s: "
505: "%.100s", config, strerror(errno));
506: } else {
507: r = snprintf(buf, sizeof buf, "%s/%s", pw->pw_dir,
508: _PATH_SSH_USER_CONFFILE);
509: if (r > 0 && (size_t)r < sizeof(buf))
1.466 djm 510: (void)read_config_file(buf, pw, host, host_name,
1.408 djm 511: &options, SSHCONF_CHECKPERM | SSHCONF_USERCONF |
512: (post_canon ? SSHCONF_POSTCANON : 0));
1.400 djm 513:
514: /* Read systemwide configuration file after user config. */
1.408 djm 515: (void)read_config_file(_PATH_HOST_CONFIG_FILE, pw,
1.466 djm 516: host, host_name, &options,
1.408 djm 517: post_canon ? SSHCONF_POSTCANON : 0);
518: }
519: }
520:
521: /* Rewrite the port number in an addrinfo list of addresses */
522: static void
523: set_addrinfo_port(struct addrinfo *addrs, int port)
524: {
525: struct addrinfo *addr;
526:
527: for (addr = addrs; addr != NULL; addr = addr->ai_next) {
528: switch (addr->ai_family) {
529: case AF_INET:
530: ((struct sockaddr_in *)addr->ai_addr)->
531: sin_port = htons(port);
532: break;
533: case AF_INET6:
534: ((struct sockaddr_in6 *)addr->ai_addr)->
535: sin6_port = htons(port);
536: break;
537: }
1.400 djm 538: }
539: }
540:
541: /*
1.32 deraadt 542: * Main program for the ssh client.
543: */
1.2 provos 544: int
545: main(int ac, char **av)
1.1 deraadt 546: {
1.437 djm 547: struct ssh *ssh = NULL;
1.462 djm 548: int i, r, opt, exit_status, use_syslog, direct, timeout_ms;
1.470 djm 549: int was_addr, config_test = 0, opt_terminated = 0;
1.466 djm 550: char *p, *cp, *line, *argv0, buf[PATH_MAX], *logfile;
551: char cname[NI_MAXHOST];
1.31 markus 552: struct stat st;
1.98 markus 553: struct passwd *pw;
1.144 stevesk 554: extern int optind, optreset;
555: extern char *optarg;
1.406 millert 556: struct Forward fwd;
1.385 djm 557: struct addrinfo *addrs = NULL;
1.405 djm 558: struct ssh_digest_ctx *md;
559: u_char conn_hash[SSH_DIGEST_MAX_LENGTH];
1.250 djm 560:
1.436 dtucker 561: ssh_malloc_init(); /* must be called before any mallocs */
1.250 djm 562: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
563: sanitise_stdfd();
1.31 markus 564:
1.33 markus 565: /*
1.346 djm 566: * Discard other fds that are hanging around. These can cause problem
567: * with backgrounded ssh processes started by ControlPersist.
568: */
569: closefrom(STDERR_FILENO + 1);
570:
571: /*
1.33 markus 572: * Save the original real uid. It will be needed later (uid-swapping
573: * may clobber the real uid).
574: */
1.31 markus 575: original_real_uid = getuid();
576: original_effective_uid = geteuid();
577:
1.184 stevesk 578: /*
579: * Use uid-swapping to give up root privileges for the duration of
580: * option processing. We will re-instantiate the rights when we are
581: * ready to create the privileged port, and will permanently drop
582: * them when the port has been created (actually, when the connection
583: * has been made, as we may need to create the port several times).
584: */
585: PRIV_END;
586:
1.31 markus 587: /* If we are installed setuid root be careful to not drop core. */
588: if (original_real_uid != original_effective_uid) {
589: struct rlimit rlim;
590: rlim.rlim_cur = rlim.rlim_max = 0;
591: if (setrlimit(RLIMIT_CORE, &rlim) < 0)
592: fatal("setrlimit failed: %.100s", strerror(errno));
1.1 deraadt 593: }
1.107 markus 594: /* Get user data. */
595: pw = getpwuid(original_real_uid);
596: if (!pw) {
1.380 djm 597: logit("No user exists for uid %lu", (u_long)original_real_uid);
1.257 dtucker 598: exit(255);
1.107 markus 599: }
600: /* Take a copy of the returned structure. */
601: pw = pwcopy(pw);
1.31 markus 602:
1.33 markus 603: /*
604: * Set our umask to something reasonable, as some files are created
605: * with the default umask. This will make them world-readable but
606: * writable only by the owner, which is ok for all files for which we
607: * don't set the modes explicitly.
608: */
1.31 markus 609: umask(022);
1.445 djm 610:
611: setlocale(LC_CTYPE, "");
1.31 markus 612:
1.316 djm 613: /*
614: * Initialize option structure to indicate that no values have been
615: * set.
616: */
1.31 markus 617: initialize_options(&options);
618:
1.463 djm 619: /*
620: * Prepare main ssh transport/connection structures
621: */
622: if ((ssh = ssh_alloc_session_state()) == NULL)
623: fatal("Couldn't allocate session state");
624: channel_init_channels(ssh);
625: active_state = ssh; /* XXX legacy API compat */
626:
1.31 markus 627: /* Parse command-line arguments. */
628: host = NULL;
1.320 djm 629: use_syslog = 0;
1.375 dtucker 630: logfile = NULL;
1.325 markus 631: argv0 = av[0];
1.31 markus 632:
1.266 djm 633: again:
1.316 djm 634: while ((opt = getopt(ac, av, "1246ab:c:e:fgi:kl:m:no:p:qstvx"
1.474 djm 635: "AB:CD:E:F:GI:J:KL:MNO:PQ:R:S:TVw:W:XYy")) != -1) {
1.31 markus 636: switch (opt) {
1.91 jakob 637: case '1':
1.454 djm 638: fatal("SSH protocol v.1 is no longer supported");
1.91 jakob 639: break;
1.47 markus 640: case '2':
1.454 djm 641: /* Ignored */
1.47 markus 642: break;
1.37 markus 643: case '4':
1.196 djm 644: options.address_family = AF_INET;
1.37 markus 645: break;
646: case '6':
1.196 djm 647: options.address_family = AF_INET6;
1.37 markus 648: break;
1.31 markus 649: case 'n':
650: stdin_null_flag = 1;
651: break;
652: case 'f':
653: fork_after_authentication_flag = 1;
654: stdin_null_flag = 1;
655: break;
656: case 'x':
657: options.forward_x11 = 0;
658: break;
659: case 'X':
660: options.forward_x11 = 1;
661: break;
1.320 djm 662: case 'y':
663: use_syslog = 1;
664: break;
1.375 dtucker 665: case 'E':
1.422 dtucker 666: logfile = optarg;
1.375 dtucker 667: break;
1.408 djm 668: case 'G':
669: config_test = 1;
670: break;
1.202 markus 671: case 'Y':
672: options.forward_x11 = 1;
673: options.forward_x11_trusted = 1;
674: break;
1.31 markus 675: case 'g':
1.406 millert 676: options.fwd_opts.gateway_ports = 1;
1.31 markus 677: break;
1.229 djm 678: case 'O':
1.441 dtucker 679: if (options.stdio_forward_host != NULL)
1.332 djm 680: fatal("Cannot specify multiplexing "
681: "command with -W");
682: else if (muxclient_command != 0)
683: fatal("Multiplexing command already specified");
1.229 djm 684: if (strcmp(optarg, "check") == 0)
1.312 djm 685: muxclient_command = SSHMUX_COMMAND_ALIVE_CHECK;
1.338 markus 686: else if (strcmp(optarg, "forward") == 0)
687: muxclient_command = SSHMUX_COMMAND_FORWARD;
1.229 djm 688: else if (strcmp(optarg, "exit") == 0)
1.312 djm 689: muxclient_command = SSHMUX_COMMAND_TERMINATE;
1.357 djm 690: else if (strcmp(optarg, "stop") == 0)
691: muxclient_command = SSHMUX_COMMAND_STOP;
1.365 djm 692: else if (strcmp(optarg, "cancel") == 0)
693: muxclient_command = SSHMUX_COMMAND_CANCEL_FWD;
1.447 markus 694: else if (strcmp(optarg, "proxy") == 0)
695: muxclient_command = SSHMUX_COMMAND_PROXY;
1.229 djm 696: else
697: fatal("Invalid multiplex command.");
698: break;
1.183 stevesk 699: case 'P': /* deprecated */
1.31 markus 700: options.use_privileged_port = 0;
1.376 djm 701: break;
1.394 deraadt 702: case 'Q':
1.376 djm 703: cp = NULL;
1.394 deraadt 704: if (strcmp(optarg, "cipher") == 0)
1.393 djm 705: cp = cipher_alg_list('\n', 0);
1.394 deraadt 706: else if (strcmp(optarg, "cipher-auth") == 0)
1.393 djm 707: cp = cipher_alg_list('\n', 1);
1.394 deraadt 708: else if (strcmp(optarg, "mac") == 0)
1.392 dtucker 709: cp = mac_alg_list('\n');
1.394 deraadt 710: else if (strcmp(optarg, "kex") == 0)
1.392 dtucker 711: cp = kex_alg_list('\n');
1.394 deraadt 712: else if (strcmp(optarg, "key") == 0)
1.451 djm 713: cp = sshkey_alg_list(0, 0, 0, '\n');
1.396 markus 714: else if (strcmp(optarg, "key-cert") == 0)
1.451 djm 715: cp = sshkey_alg_list(1, 0, 0, '\n');
1.396 markus 716: else if (strcmp(optarg, "key-plain") == 0)
1.451 djm 717: cp = sshkey_alg_list(0, 1, 0, '\n');
1.416 djm 718: else if (strcmp(optarg, "protocol-version") == 0) {
719: cp = xstrdup("2");
720: }
1.376 djm 721: if (cp == NULL)
722: fatal("Unsupported query \"%s\"", optarg);
723: printf("%s\n", cp);
724: free(cp);
725: exit(0);
1.31 markus 726: break;
727: case 'a':
728: options.forward_agent = 0;
1.53 markus 729: break;
730: case 'A':
731: options.forward_agent = 1;
1.31 markus 732: break;
733: case 'k':
1.204 dtucker 734: options.gss_deleg_creds = 0;
1.297 djm 735: break;
736: case 'K':
737: options.gss_authentication = 1;
738: options.gss_deleg_creds = 1;
1.31 markus 739: break;
740: case 'i':
1.429 dtucker 741: p = tilde_expand_filename(optarg, original_real_uid);
742: if (stat(p, &st) < 0)
1.128 fgsch 743: fprintf(stderr, "Warning: Identity file %s "
1.429 dtucker 744: "not accessible: %s.\n", p,
1.231 otto 745: strerror(errno));
1.429 dtucker 746: else
747: add_identity_file(&options, NULL, p, 1);
748: free(p);
1.31 markus 749: break;
1.127 markus 750: case 'I':
1.333 markus 751: #ifdef ENABLE_PKCS11
1.422 dtucker 752: free(options.pkcs11_provider);
1.333 markus 753: options.pkcs11_provider = xstrdup(optarg);
1.137 jakob 754: #else
1.333 markus 755: fprintf(stderr, "no support for PKCS#11.\n");
1.137 jakob 756: #endif
1.127 markus 757: break;
1.443 djm 758: case 'J':
759: if (options.jump_host != NULL)
760: fatal("Only a single -J option permitted");
761: if (options.proxy_command != NULL)
762: fatal("Cannot specify -J with ProxyCommand");
763: if (parse_jump(optarg, &options, 1) == -1)
764: fatal("Invalid -J argument");
765: options.proxy_command = xstrdup("none");
766: break;
1.31 markus 767: case 't':
1.359 djm 768: if (options.request_tty == REQUEST_TTY_YES)
769: options.request_tty = REQUEST_TTY_FORCE;
770: else
771: options.request_tty = REQUEST_TTY_YES;
1.31 markus 772: break;
773: case 'v':
1.197 markus 774: if (debug_flag == 0) {
1.66 markus 775: debug_flag = 1;
776: options.log_level = SYSLOG_LEVEL_DEBUG1;
1.197 markus 777: } else {
1.443 djm 778: if (options.log_level < SYSLOG_LEVEL_DEBUG3) {
779: debug_flag++;
1.197 markus 780: options.log_level++;
1.443 djm 781: }
1.197 markus 782: }
1.375 dtucker 783: break;
1.31 markus 784: case 'V':
1.209 markus 785: fprintf(stderr, "%s, %s\n",
1.402 markus 786: SSH_VERSION,
787: #ifdef WITH_OPENSSL
788: SSLeay_version(SSLEAY_VERSION)
789: #else
790: "without OpenSSL"
791: #endif
792: );
1.31 markus 793: if (opt == 'V')
794: exit(0);
795: break;
1.255 reyk 796: case 'w':
1.256 reyk 797: if (options.tun_open == -1)
798: options.tun_open = SSH_TUNMODE_DEFAULT;
1.255 reyk 799: options.tun_local = a2tun(optarg, &options.tun_remote);
1.256 reyk 800: if (options.tun_local == SSH_TUNID_ERR) {
1.316 djm 801: fprintf(stderr,
802: "Bad tun device '%s'\n", optarg);
1.257 dtucker 803: exit(255);
1.255 reyk 804: }
805: break;
1.331 dtucker 806: case 'W':
1.441 dtucker 807: if (options.stdio_forward_host != NULL)
1.332 djm 808: fatal("stdio forward already specified");
809: if (muxclient_command != 0)
810: fatal("Cannot specify stdio forward with -O");
1.331 dtucker 811: if (parse_forward(&fwd, optarg, 1, 0)) {
1.441 dtucker 812: options.stdio_forward_host = fwd.listen_host;
813: options.stdio_forward_port = fwd.listen_port;
1.378 djm 814: free(fwd.connect_host);
1.331 dtucker 815: } else {
816: fprintf(stderr,
817: "Bad stdio forwarding specification '%s'\n",
818: optarg);
819: exit(255);
820: }
1.359 djm 821: options.request_tty = REQUEST_TTY_NO;
1.331 dtucker 822: no_shell_flag = 1;
823: break;
1.31 markus 824: case 'q':
825: options.log_level = SYSLOG_LEVEL_QUIET;
826: break;
827: case 'e':
828: if (optarg[0] == '^' && optarg[2] == 0 &&
1.128 fgsch 829: (u_char) optarg[1] >= 64 &&
830: (u_char) optarg[1] < 128)
1.78 markus 831: options.escape_char = (u_char) optarg[1] & 31;
1.31 markus 832: else if (strlen(optarg) == 1)
1.78 markus 833: options.escape_char = (u_char) optarg[0];
1.31 markus 834: else if (strcmp(optarg, "none") == 0)
1.119 stevesk 835: options.escape_char = SSH_ESCAPECHAR_NONE;
1.31 markus 836: else {
1.128 fgsch 837: fprintf(stderr, "Bad escape character '%s'.\n",
838: optarg);
1.257 dtucker 839: exit(255);
1.31 markus 840: }
841: break;
842: case 'c':
1.456 djm 843: if (!ciphers_valid(*optarg == '+' ?
1.420 djm 844: optarg + 1 : optarg)) {
845: fprintf(stderr, "Unknown cipher type '%s'\n",
846: optarg);
847: exit(255);
1.95 markus 848: }
1.456 djm 849: free(options.ciphers);
850: options.ciphers = xstrdup(optarg);
1.95 markus 851: break;
852: case 'm':
1.422 dtucker 853: if (mac_valid(optarg)) {
854: free(options.macs);
1.95 markus 855: options.macs = xstrdup(optarg);
1.422 dtucker 856: } else {
1.128 fgsch 857: fprintf(stderr, "Unknown mac type '%s'\n",
858: optarg);
1.257 dtucker 859: exit(255);
1.31 markus 860: }
861: break;
1.214 djm 862: case 'M':
1.242 djm 863: if (options.control_master == SSHCTL_MASTER_YES)
864: options.control_master = SSHCTL_MASTER_ASK;
865: else
866: options.control_master = SSHCTL_MASTER_YES;
1.214 djm 867: break;
1.31 markus 868: case 'p':
1.465 millert 869: if (options.port == -1) {
870: options.port = a2port(optarg);
871: if (options.port <= 0) {
872: fprintf(stderr, "Bad port '%s'\n",
873: optarg);
874: exit(255);
875: }
1.109 markus 876: }
1.31 markus 877: break;
878: case 'l':
1.465 millert 879: if (options.user == NULL)
880: options.user = optarg;
1.31 markus 881: break;
1.141 stevesk 882:
883: case 'L':
1.324 djm 884: if (parse_forward(&fwd, optarg, 0, 0))
1.232 djm 885: add_local_forward(&options, &fwd);
886: else {
1.128 fgsch 887: fprintf(stderr,
1.232 djm 888: "Bad local forwarding specification '%s'\n",
1.128 fgsch 889: optarg);
1.257 dtucker 890: exit(255);
1.31 markus 891: }
1.232 djm 892: break;
893:
894: case 'R':
1.464 markus 895: if (parse_forward(&fwd, optarg, 0, 1) ||
896: parse_forward(&fwd, optarg, 1, 1)) {
1.232 djm 897: add_remote_forward(&options, &fwd);
898: } else {
1.128 fgsch 899: fprintf(stderr,
1.232 djm 900: "Bad remote forwarding specification "
901: "'%s'\n", optarg);
1.257 dtucker 902: exit(255);
1.31 markus 903: }
904: break;
1.108 markus 905:
906: case 'D':
1.324 djm 907: if (parse_forward(&fwd, optarg, 1, 0)) {
1.322 stevesk 908: add_local_forward(&options, &fwd);
1.232 djm 909: } else {
1.322 stevesk 910: fprintf(stderr,
911: "Bad dynamic forwarding specification "
912: "'%s'\n", optarg);
1.257 dtucker 913: exit(255);
1.109 markus 914: }
1.108 markus 915: break;
916:
1.31 markus 917: case 'C':
918: options.compression = 1;
919: break;
1.45 markus 920: case 'N':
921: no_shell_flag = 1;
1.359 djm 922: options.request_tty = REQUEST_TTY_NO;
1.45 markus 923: break;
924: case 'T':
1.359 djm 925: options.request_tty = REQUEST_TTY_NO;
1.45 markus 926: break;
1.31 markus 927: case 'o':
1.205 markus 928: line = xstrdup(optarg);
1.408 djm 929: if (process_config_line(&options, pw,
930: host ? host : "", host ? host : "", line,
931: "command-line", 0, NULL, SSHCONF_USERCONF) != 0)
1.257 dtucker 932: exit(255);
1.378 djm 933: free(line);
1.31 markus 934: break;
1.85 djm 935: case 's':
936: subsystem_flag = 1;
1.117 markus 937: break;
1.214 djm 938: case 'S':
1.431 mmcc 939: free(options.control_path);
1.214 djm 940: options.control_path = xstrdup(optarg);
941: break;
1.117 markus 942: case 'b':
943: options.bind_address = optarg;
1.474 djm 944: break;
945: case 'B':
946: options.bind_interface = optarg;
1.85 djm 947: break;
1.139 markus 948: case 'F':
949: config = optarg;
950: break;
1.31 markus 951: default:
952: usage();
1.1 deraadt 953: }
1.31 markus 954: }
955:
1.462 djm 956: if (optind > 1 && strcmp(av[optind - 1], "--") == 0)
957: opt_terminated = 1;
958:
1.128 fgsch 959: ac -= optind;
960: av += optind;
961:
1.329 guenther 962: if (ac > 0 && !host) {
1.465 millert 963: int tport;
964: char *tuser;
965: switch (parse_ssh_uri(*av, &tuser, &host, &tport)) {
966: case -1:
967: usage();
968: break;
969: case 0:
970: if (options.user == NULL) {
971: options.user = tuser;
972: tuser = NULL;
973: }
974: free(tuser);
975: if (options.port == -1 && tport != -1)
976: options.port = tport;
977: break;
978: default:
1.128 fgsch 979: p = xstrdup(*av);
1.188 markus 980: cp = strrchr(p, '@');
1.465 millert 981: if (cp != NULL) {
982: if (cp == p)
983: usage();
984: if (options.user == NULL) {
985: options.user = p;
986: p = NULL;
987: }
988: *cp++ = '\0';
989: host = xstrdup(cp);
990: free(p);
991: } else
992: host = p;
993: break;
994: }
1.462 djm 995: if (ac > 1 && !opt_terminated) {
1.189 millert 996: optind = optreset = 1;
1.128 fgsch 997: goto again;
998: }
1.189 millert 999: ac--, av++;
1.128 fgsch 1000: }
1001:
1.31 markus 1002: /* Check that we got a host name. */
1003: if (!host)
1004: usage();
1005:
1.385 djm 1006: host_arg = xstrdup(host);
1007:
1.402 markus 1008: #ifdef WITH_OPENSSL
1.350 djm 1009: OpenSSL_add_all_algorithms();
1.72 markus 1010: ERR_load_crypto_strings();
1.402 markus 1011: #endif
1.31 markus 1012:
1013: /* Initialize the command to execute on remote host. */
1014: buffer_init(&command);
1.1 deraadt 1015:
1.33 markus 1016: /*
1017: * Save the command to execute on the remote host in a buffer. There
1018: * is no limit on the length of the command, except by the maximum
1019: * packet size. Also sets the tty flag if there is no command.
1020: */
1.128 fgsch 1021: if (!ac) {
1.31 markus 1022: /* No command specified - execute shell on a tty. */
1.85 djm 1023: if (subsystem_flag) {
1.128 fgsch 1024: fprintf(stderr,
1025: "You must specify a subsystem to invoke.\n");
1.85 djm 1026: usage();
1027: }
1.31 markus 1028: } else {
1.128 fgsch 1029: /* A command has been specified. Store it into the buffer. */
1030: for (i = 0; i < ac; i++) {
1031: if (i)
1.31 markus 1032: buffer_append(&command, " ", 1);
1033: buffer_append(&command, av[i], strlen(av[i]));
1034: }
1035: }
1036:
1.101 markus 1037: /*
1038: * Initialize "log" output. Since we are the client all output
1.375 dtucker 1039: * goes to stderr unless otherwise specified by -y or -E.
1.101 markus 1040: */
1.375 dtucker 1041: if (use_syslog && logfile != NULL)
1042: fatal("Can't specify both -y and -E");
1.422 dtucker 1043: if (logfile != NULL)
1.375 dtucker 1044: log_redirect_stderr_to(logfile);
1.325 markus 1045: log_init(argv0,
1.468 djm 1046: options.log_level == SYSLOG_LEVEL_NOT_SET ?
1.452 dtucker 1047: SYSLOG_LEVEL_INFO : options.log_level,
1.468 djm 1048: options.log_facility == SYSLOG_FACILITY_NOT_SET ?
1.452 dtucker 1049: SYSLOG_FACILITY_USER : options.log_facility,
1050: !use_syslog);
1.375 dtucker 1051:
1052: if (debug_flag)
1.402 markus 1053: logit("%s, %s", SSH_VERSION,
1054: #ifdef WITH_OPENSSL
1055: SSLeay_version(SSLEAY_VERSION)
1056: #else
1057: "without OpenSSL"
1058: #endif
1059: );
1.31 markus 1060:
1.400 djm 1061: /* Parse the configuration files */
1.408 djm 1062: process_config_files(host_arg, pw, 0);
1.400 djm 1063:
1064: /* Hostname canonicalisation needs a few options filled. */
1065: fill_default_options_for_canonicalization(&options);
1066:
1067: /* If the user has replaced the hostname then take it into use now */
1068: if (options.hostname != NULL) {
1069: /* NB. Please keep in sync with readconf.c:match_cfg_line() */
1070: cp = percent_expand(options.hostname,
1071: "h", host, (char *)NULL);
1072: free(host);
1073: host = cp;
1.408 djm 1074: free(options.hostname);
1075: options.hostname = xstrdup(host);
1.400 djm 1076: }
1077:
1.470 djm 1078: /* Don't lowercase addresses, they will be explicitly canonicalised */
1079: if ((was_addr = is_addr(host)) == 0)
1080: lowercase(host);
1081:
1082: /*
1083: * Try to canonicalize if requested by configuration or the
1084: * hostname is an address.
1085: */
1086: if (options.canonicalize_hostname != SSH_CANONICALISE_NO || was_addr)
1.400 djm 1087: addrs = resolve_canonicalize(&host, options.port);
1088:
1.139 markus 1089: /*
1.401 djm 1090: * If CanonicalizePermittedCNAMEs have been specified but
1091: * other canonicalization did not happen (by not being requested
1092: * or by failing with fallback) then the hostname may still be changed
1.468 djm 1093: * as a result of CNAME following.
1.401 djm 1094: *
1095: * Try to resolve the bare hostname name using the system resolver's
1096: * usual search rules and then apply the CNAME follow rules.
1097: *
1098: * Skip the lookup if a ProxyCommand is being used unless the user
1099: * has specifically requested canonicalisation for this case via
1100: * CanonicalizeHostname=always
1.139 markus 1101: */
1.443 djm 1102: direct = option_clear_or_none(options.proxy_command) &&
1103: options.jump_host == NULL;
1104: if (addrs == NULL && options.num_permitted_cnames != 0 && (direct ||
1105: options.canonicalize_hostname == SSH_CANONICALISE_ALWAYS)) {
1.403 djm 1106: if ((addrs = resolve_host(host, options.port,
1107: option_clear_or_none(options.proxy_command),
1108: cname, sizeof(cname))) == NULL) {
1109: /* Don't fatal proxied host names not in the DNS */
1110: if (option_clear_or_none(options.proxy_command))
1111: cleanup_exit(255); /* logged in resolve_host */
1112: } else
1.443 djm 1113: check_follow_cname(direct, &host, cname);
1.400 djm 1114: }
1.139 markus 1115:
1.400 djm 1116: /*
1.408 djm 1117: * If canonicalisation is enabled then re-parse the configuration
1118: * files as new stanzas may match.
1.400 djm 1119: */
1.408 djm 1120: if (options.canonicalize_hostname != 0) {
1121: debug("Re-reading configuration after hostname "
1122: "canonicalisation");
1123: free(options.hostname);
1124: options.hostname = xstrdup(host);
1125: process_config_files(host_arg, pw, 1);
1126: /*
1127: * Address resolution happens early with canonicalisation
1128: * enabled and the port number may have changed since, so
1129: * reset it in address list
1130: */
1131: if (addrs != NULL && options.port > 0)
1132: set_addrinfo_port(addrs, options.port);
1.139 markus 1133: }
1.31 markus 1134:
1135: /* Fill configuration defaults. */
1136: fill_default_options(&options);
1.443 djm 1137:
1138: /*
1139: * If ProxyJump option specified, then construct a ProxyCommand now.
1140: */
1141: if (options.jump_host != NULL) {
1142: char port_s[8];
1143:
1144: /* Consistency check */
1145: if (options.proxy_command != NULL)
1146: fatal("inconsistent options: ProxyCommand+ProxyJump");
1147: /* Never use FD passing for ProxyJump */
1148: options.proxy_use_fdpass = 0;
1149: snprintf(port_s, sizeof(port_s), "%d", options.jump_port);
1150: xasprintf(&options.proxy_command,
1.450 djm 1151: "ssh%s%s%s%s%s%s%s%s%s%.*s -W '[%%h]:%%p' %s",
1.443 djm 1152: /* Optional "-l user" argument if jump_user set */
1153: options.jump_user == NULL ? "" : " -l ",
1154: options.jump_user == NULL ? "" : options.jump_user,
1155: /* Optional "-p port" argument if jump_port set */
1156: options.jump_port <= 0 ? "" : " -p ",
1157: options.jump_port <= 0 ? "" : port_s,
1158: /* Optional additional jump hosts ",..." */
1159: options.jump_extra == NULL ? "" : " -J ",
1160: options.jump_extra == NULL ? "" : options.jump_extra,
1161: /* Optional "-F" argumment if -F specified */
1162: config == NULL ? "" : " -F ",
1163: config == NULL ? "" : config,
1164: /* Optional "-v" arguments if -v set */
1165: debug_flag ? " -" : "",
1166: debug_flag, "vvv",
1167: /* Mandatory hostname */
1168: options.jump_host);
1169: debug("Setting implicit ProxyCommand from ProxyJump: %s",
1170: options.proxy_command);
1171: }
1.31 markus 1172:
1.400 djm 1173: if (options.port == 0)
1174: options.port = default_ssh_port();
1.463 djm 1175: channel_set_af(ssh, options.address_family);
1.196 djm 1176:
1.383 djm 1177: /* Tidy and check options */
1178: if (options.host_key_alias != NULL)
1179: lowercase(options.host_key_alias);
1180: if (options.proxy_command != NULL &&
1181: strcmp(options.proxy_command, "-") == 0 &&
1182: options.proxy_use_fdpass)
1183: fatal("ProxyCommand=- and ProxyUseFDPass are incompatible");
1.415 djm 1184: if (options.control_persist &&
1185: options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK) {
1186: debug("UpdateHostKeys=ask is incompatible with ControlPersist; "
1187: "disabling");
1188: options.update_hostkeys = 0;
1189: }
1.430 djm 1190: if (options.connection_attempts <= 0)
1191: fatal("Invalid number of ConnectionAttempts");
1192:
1.388 djm 1193: if (original_effective_uid != 0)
1194: options.use_privileged_port = 0;
1.383 djm 1195:
1.461 bluhm 1196: if (buffer_len(&command) != 0 && options.remote_command != NULL)
1197: fatal("Cannot execute command-line and remote command.");
1198:
1199: /* Cannot fork to background if no command. */
1200: if (fork_after_authentication_flag && buffer_len(&command) == 0 &&
1201: options.remote_command == NULL && !no_shell_flag)
1202: fatal("Cannot fork into background without a command "
1203: "to execute.");
1204:
1.31 markus 1205: /* reinit */
1.452 dtucker 1206: log_init(argv0, options.log_level, options.log_facility, !use_syslog);
1.370 djm 1207:
1208: if (options.request_tty == REQUEST_TTY_YES ||
1209: options.request_tty == REQUEST_TTY_FORCE)
1210: tty_flag = 1;
1211:
1212: /* Allocate a tty by default if no command specified. */
1.461 bluhm 1213: if (buffer_len(&command) == 0 && options.remote_command == NULL)
1.370 djm 1214: tty_flag = options.request_tty != REQUEST_TTY_NO;
1215:
1216: /* Force no tty */
1.447 markus 1217: if (options.request_tty == REQUEST_TTY_NO ||
1218: (muxclient_command && muxclient_command != SSHMUX_COMMAND_PROXY))
1.370 djm 1219: tty_flag = 0;
1220: /* Do not allocate a tty if stdin is not a tty. */
1221: if ((!isatty(fileno(stdin)) || stdin_null_flag) &&
1222: options.request_tty != REQUEST_TTY_FORCE) {
1223: if (tty_flag)
1224: logit("Pseudo-terminal will not be allocated because "
1225: "stdin is not a terminal.");
1226: tty_flag = 0;
1227: }
1.31 markus 1228:
1229: if (options.user == NULL)
1230: options.user = xstrdup(pw->pw_name);
1.343 djm 1231:
1.466 djm 1232: /* Set up strings used to percent_expand() arguments */
1.358 djm 1233: if (gethostname(thishost, sizeof(thishost)) == -1)
1234: fatal("gethostname: %s", strerror(errno));
1235: strlcpy(shorthost, thishost, sizeof(shorthost));
1236: shorthost[strcspn(thishost, ".")] = '\0';
1237: snprintf(portstr, sizeof(portstr), "%d", options.port);
1.423 djm 1238: snprintf(uidstr, sizeof(uidstr), "%d", pw->pw_uid);
1.358 djm 1239:
1.405 djm 1240: if ((md = ssh_digest_start(SSH_DIGEST_SHA1)) == NULL ||
1241: ssh_digest_update(md, thishost, strlen(thishost)) < 0 ||
1242: ssh_digest_update(md, host, strlen(host)) < 0 ||
1243: ssh_digest_update(md, portstr, strlen(portstr)) < 0 ||
1244: ssh_digest_update(md, options.user, strlen(options.user)) < 0 ||
1245: ssh_digest_final(md, conn_hash, sizeof(conn_hash)) < 0)
1246: fatal("%s: mux digest failed", __func__);
1247: ssh_digest_free(md);
1248: conn_hash_hex = tohex(conn_hash, ssh_digest_bytes(SSH_DIGEST_SHA1));
1249:
1.466 djm 1250: /*
1251: * Expand tokens in arguments. NB. LocalCommand is expanded later,
1252: * after port-forwarding is set up, so it may pick up any local
1253: * tunnel interface name allocated.
1254: */
1.461 bluhm 1255: if (options.remote_command != NULL) {
1256: debug3("expanding RemoteCommand: %s", options.remote_command);
1257: cp = options.remote_command;
1258: options.remote_command = percent_expand(cp,
1259: "C", conn_hash_hex,
1260: "L", shorthost,
1261: "d", pw->pw_dir,
1262: "h", host,
1263: "l", thishost,
1264: "n", host_arg,
1265: "p", portstr,
1266: "r", options.user,
1267: "u", pw->pw_name,
1268: (char *)NULL);
1269: debug3("expanded RemoteCommand: %s", options.remote_command);
1270: free(cp);
1271: buffer_append(&command, options.remote_command,
1272: strlen(options.remote_command));
1.304 dtucker 1273: }
1.31 markus 1274:
1.214 djm 1275: if (options.control_path != NULL) {
1.241 djm 1276: cp = tilde_expand_filename(options.control_path,
1277: original_real_uid);
1.378 djm 1278: free(options.control_path);
1.405 djm 1279: options.control_path = percent_expand(cp,
1280: "C", conn_hash_hex,
1281: "L", shorthost,
1282: "h", host,
1283: "l", thishost,
1284: "n", host_arg,
1285: "p", portstr,
1286: "r", options.user,
1287: "u", pw->pw_name,
1.423 djm 1288: "i", uidstr,
1.358 djm 1289: (char *)NULL);
1.378 djm 1290: free(cp);
1.214 djm 1291: }
1.405 djm 1292: free(conn_hash_hex);
1.408 djm 1293:
1294: if (config_test) {
1295: dump_client_config(&options, host);
1296: exit(0);
1297: }
1.405 djm 1298:
1.312 djm 1299: if (muxclient_command != 0 && options.control_path == NULL)
1.240 djm 1300: fatal("No ControlPath specified for \"-O\" command");
1.447 markus 1301: if (options.control_path != NULL) {
1302: int sock;
1303: if ((sock = muxclient(options.control_path)) >= 0) {
1.463 djm 1304: ssh_packet_set_connection(ssh, sock, sock);
1.447 markus 1305: packet_set_mux();
1306: goto skip_connect;
1307: }
1308: }
1.401 djm 1309:
1310: /*
1311: * If hostname canonicalisation was not enabled, then we may not
1312: * have yet resolved the hostname. Do so now.
1313: */
1314: if (addrs == NULL && options.proxy_command == NULL) {
1.421 djm 1315: debug2("resolving \"%s\" port %d", host, options.port);
1.401 djm 1316: if ((addrs = resolve_host(host, options.port, 1,
1317: cname, sizeof(cname))) == NULL)
1318: cleanup_exit(255); /* resolve_host logs the error */
1319: }
1.214 djm 1320:
1.303 djm 1321: timeout_ms = options.connection_timeout * 1000;
1322:
1.77 markus 1323: /* Open a connection to the remote host. */
1.463 djm 1324: if (ssh_connect(ssh, host, addrs, &hostaddr, options.port,
1.385 djm 1325: options.address_family, options.connection_attempts,
1326: &timeout_ms, options.tcp_keep_alive,
1.388 djm 1327: options.use_privileged_port) != 0)
1.257 dtucker 1328: exit(255);
1.31 markus 1329:
1.391 djm 1330: if (addrs != NULL)
1331: freeaddrinfo(addrs);
1332:
1.385 djm 1333: packet_set_timeout(options.server_alive_interval,
1334: options.server_alive_count_max);
1335:
1.437 djm 1336: ssh = active_state; /* XXX */
1337:
1.303 djm 1338: if (timeout_ms > 0)
1339: debug3("timeout: %d ms remain after connect", timeout_ms);
1340:
1.33 markus 1341: /*
1342: * If we successfully made the connection, load the host private key
1343: * in case we will need it later for combined rsa-rhosts
1344: * authentication. This must be done before releasing extra
1345: * privileges, because the file is only readable by root.
1.174 markus 1346: * If we cannot access the private keys, load the public keys
1347: * instead and try to execute the ssh-keysign helper instead.
1.33 markus 1348: */
1.112 markus 1349: sensitive_data.nkeys = 0;
1350: sensitive_data.keys = NULL;
1.173 markus 1351: sensitive_data.external_keysign = 0;
1.457 djm 1352: if (options.hostbased_authentication) {
1.475 ! markus 1353: sensitive_data.nkeys = 11;
1.274 deraadt 1354: sensitive_data.keys = xcalloc(sensitive_data.nkeys,
1.460 markus 1355: sizeof(struct sshkey)); /* XXX */
1.177 markus 1356:
1357: PRIV_START;
1.411 djm 1358: sensitive_data.keys[1] = key_load_private_cert(KEY_ECDSA,
1.349 djm 1359: _PATH_HOST_ECDSA_KEY_FILE, "", NULL);
1.411 djm 1360: sensitive_data.keys[2] = key_load_private_cert(KEY_ED25519,
1361: _PATH_HOST_ED25519_KEY_FILE, "", NULL);
1.349 djm 1362: sensitive_data.keys[3] = key_load_private_cert(KEY_RSA,
1.345 djm 1363: _PATH_HOST_RSA_KEY_FILE, "", NULL);
1.411 djm 1364: sensitive_data.keys[4] = key_load_private_cert(KEY_DSA,
1365: _PATH_HOST_DSA_KEY_FILE, "", NULL);
1366: sensitive_data.keys[5] = key_load_private_type(KEY_ECDSA,
1.349 djm 1367: _PATH_HOST_ECDSA_KEY_FILE, "", NULL, NULL);
1.411 djm 1368: sensitive_data.keys[6] = key_load_private_type(KEY_ED25519,
1369: _PATH_HOST_ED25519_KEY_FILE, "", NULL, NULL);
1.397 djm 1370: sensitive_data.keys[7] = key_load_private_type(KEY_RSA,
1.276 dtucker 1371: _PATH_HOST_RSA_KEY_FILE, "", NULL, NULL);
1.411 djm 1372: sensitive_data.keys[8] = key_load_private_type(KEY_DSA,
1373: _PATH_HOST_DSA_KEY_FILE, "", NULL, NULL);
1.475 ! markus 1374: sensitive_data.keys[9] = key_load_private_cert(KEY_XMSS,
! 1375: _PATH_HOST_XMSS_KEY_FILE, "", NULL);
! 1376: sensitive_data.keys[10] = key_load_private_type(KEY_XMSS,
! 1377: _PATH_HOST_XMSS_KEY_FILE, "", NULL, NULL);
1.177 markus 1378: PRIV_END;
1.173 markus 1379:
1.181 markus 1380: if (options.hostbased_authentication == 1 &&
1381: sensitive_data.keys[0] == NULL &&
1.349 djm 1382: sensitive_data.keys[5] == NULL &&
1.396 markus 1383: sensitive_data.keys[6] == NULL &&
1.397 djm 1384: sensitive_data.keys[7] == NULL &&
1.475 ! markus 1385: sensitive_data.keys[8] == NULL &&
! 1386: sensitive_data.keys[9] == NULL) {
1.345 djm 1387: sensitive_data.keys[1] = key_load_cert(
1.411 djm 1388: _PATH_HOST_ECDSA_KEY_FILE);
1.345 djm 1389: sensitive_data.keys[2] = key_load_cert(
1.411 djm 1390: _PATH_HOST_ED25519_KEY_FILE);
1.349 djm 1391: sensitive_data.keys[3] = key_load_cert(
1.345 djm 1392: _PATH_HOST_RSA_KEY_FILE);
1.397 djm 1393: sensitive_data.keys[4] = key_load_cert(
1.411 djm 1394: _PATH_HOST_DSA_KEY_FILE);
1.397 djm 1395: sensitive_data.keys[5] = key_load_public(
1.411 djm 1396: _PATH_HOST_ECDSA_KEY_FILE, NULL);
1.397 djm 1397: sensitive_data.keys[6] = key_load_public(
1.411 djm 1398: _PATH_HOST_ED25519_KEY_FILE, NULL);
1.397 djm 1399: sensitive_data.keys[7] = key_load_public(
1.173 markus 1400: _PATH_HOST_RSA_KEY_FILE, NULL);
1.397 djm 1401: sensitive_data.keys[8] = key_load_public(
1.411 djm 1402: _PATH_HOST_DSA_KEY_FILE, NULL);
1.475 ! markus 1403: sensitive_data.keys[9] = key_load_cert(
! 1404: _PATH_HOST_XMSS_KEY_FILE);
! 1405: sensitive_data.keys[10] = key_load_public(
! 1406: _PATH_HOST_XMSS_KEY_FILE, NULL);
1.173 markus 1407: sensitive_data.external_keysign = 1;
1408: }
1.31 markus 1409: }
1.33 markus 1410: /*
1411: * Get rid of any extra privileges that we may have. We will no
1412: * longer need them. Also, extra privileges could make it very hard
1413: * to read identity files and other non-world-readable files from the
1414: * user's home directory if it happens to be on a NFS volume where
1415: * root is mapped to nobody.
1416: */
1.225 dtucker 1417: if (original_effective_uid == 0) {
1418: PRIV_START;
1419: permanently_set_uid(pw);
1420: }
1.31 markus 1421:
1.33 markus 1422: /*
1423: * Now that we are back to our own permissions, create ~/.ssh
1.254 djm 1424: * directory if it doesn't already exist.
1.33 markus 1425: */
1.367 djm 1426: if (config == NULL) {
1427: r = snprintf(buf, sizeof buf, "%s%s%s", pw->pw_dir,
1428: strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR);
1429: if (r > 0 && (size_t)r < sizeof(buf) && stat(buf, &st) < 0)
1430: if (mkdir(buf, 0700) < 0)
1431: error("Could not create directory '%.200s'.",
1432: buf);
1433: }
1.31 markus 1434:
1.104 markus 1435: /* load options.identity_files */
1.466 djm 1436: load_public_identity_files(pw);
1.439 markus 1437:
1438: /* optionally set the SSH_AUTHSOCKET_ENV_NAME varibale */
1.440 markus 1439: if (options.identity_agent &&
1440: strcmp(options.identity_agent, SSH_AUTHSOCKET_ENV_NAME) != 0) {
1.439 markus 1441: if (strcmp(options.identity_agent, "none") == 0) {
1442: unsetenv(SSH_AUTHSOCKET_ENV_NAME);
1443: } else {
1444: p = tilde_expand_filename(options.identity_agent,
1445: original_real_uid);
1446: cp = percent_expand(p, "d", pw->pw_dir,
1447: "u", pw->pw_name, "l", thishost, "h", host,
1448: "r", options.user, (char *)NULL);
1449: setenv(SSH_AUTHSOCKET_ENV_NAME, cp, 1);
1450: free(cp);
1451: free(p);
1452: }
1453: }
1.104 markus 1454:
1455: /* Expand ~ in known host file names. */
1.361 djm 1456: tilde_expand_paths(options.system_hostfiles,
1457: options.num_system_hostfiles);
1458: tilde_expand_paths(options.user_hostfiles, options.num_user_hostfiles);
1.149 markus 1459:
1460: signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
1.352 djm 1461: signal(SIGCHLD, main_sigchld_handler);
1.31 markus 1462:
1.316 djm 1463: /* Log into the remote system. Never returns if the login fails. */
1.303 djm 1464: ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr,
1.355 djm 1465: options.port, pw, timeout_ms);
1.339 djm 1466:
1467: if (packet_connection_is_on_socket()) {
1468: verbose("Authenticated to %s ([%s]:%d).", host,
1.437 djm 1469: ssh_remote_ipaddr(ssh), ssh_remote_port(ssh));
1.339 djm 1470: } else {
1471: verbose("Authenticated to %s (via proxy).", host);
1472: }
1.31 markus 1473:
1.112 markus 1474: /* We no longer need the private host keys. Clear them now. */
1475: if (sensitive_data.nkeys != 0) {
1476: for (i = 0; i < sensitive_data.nkeys; i++) {
1477: if (sensitive_data.keys[i] != NULL) {
1478: /* Destroys contents safely */
1479: debug3("clear hostkey %d", i);
1480: key_free(sensitive_data.keys[i]);
1481: sensitive_data.keys[i] = NULL;
1482: }
1483: }
1.378 djm 1484: free(sensitive_data.keys);
1.134 markus 1485: }
1486: for (i = 0; i < options.num_identity_files; i++) {
1.378 djm 1487: free(options.identity_files[i]);
1488: options.identity_files[i] = NULL;
1.134 markus 1489: if (options.identity_keys[i]) {
1490: key_free(options.identity_keys[i]);
1491: options.identity_keys[i] = NULL;
1492: }
1.112 markus 1493: }
1.426 djm 1494: for (i = 0; i < options.num_certificate_files; i++) {
1495: free(options.certificate_files[i]);
1496: options.certificate_files[i] = NULL;
1497: }
1.31 markus 1498:
1.447 markus 1499: skip_connect:
1.466 djm 1500: exit_status = ssh_session2(ssh, pw);
1.45 markus 1501: packet_close();
1.186 djm 1502:
1.312 djm 1503: if (options.control_path != NULL && muxserver_sock != -1)
1.214 djm 1504: unlink(options.control_path);
1505:
1.353 djm 1506: /* Kill ProxyCommand if it is running. */
1507: ssh_kill_proxy_command();
1.186 djm 1508:
1.45 markus 1509: return exit_status;
1510: }
1511:
1.344 djm 1512: static void
1513: control_persist_detach(void)
1514: {
1515: pid_t pid;
1.438 djm 1516: int devnull, keep_stderr;
1.344 djm 1517:
1518: debug("%s: backgrounding master process", __func__);
1519:
1.473 djm 1520: /*
1521: * master (current process) into the background, and make the
1522: * foreground process a client of the backgrounded master.
1523: */
1.344 djm 1524: switch ((pid = fork())) {
1525: case -1:
1526: fatal("%s: fork: %s", __func__, strerror(errno));
1527: case 0:
1528: /* Child: master process continues mainloop */
1.473 djm 1529: break;
1530: default:
1.344 djm 1531: /* Parent: set up mux slave to connect to backgrounded master */
1532: debug2("%s: background process is %ld", __func__, (long)pid);
1533: stdin_null_flag = ostdin_null_flag;
1.359 djm 1534: options.request_tty = orequest_tty;
1.344 djm 1535: tty_flag = otty_flag;
1.473 djm 1536: close(muxserver_sock);
1537: muxserver_sock = -1;
1.351 markus 1538: options.control_master = SSHCTL_MASTER_NO;
1.473 djm 1539: muxclient(options.control_path);
1.344 djm 1540: /* muxclient() doesn't return on success. */
1.473 djm 1541: fatal("Failed to connect to new control master");
1542: }
1.346 djm 1543: if ((devnull = open(_PATH_DEVNULL, O_RDWR)) == -1) {
1544: error("%s: open(\"/dev/null\"): %s", __func__,
1545: strerror(errno));
1546: } else {
1.438 djm 1547: keep_stderr = log_is_on_stderr() && debug_flag;
1.346 djm 1548: if (dup2(devnull, STDIN_FILENO) == -1 ||
1.438 djm 1549: dup2(devnull, STDOUT_FILENO) == -1 ||
1550: (!keep_stderr && dup2(devnull, STDERR_FILENO) == -1))
1.346 djm 1551: error("%s: dup2: %s", __func__, strerror(errno));
1552: if (devnull > STDERR_FILENO)
1553: close(devnull);
1554: }
1.381 djm 1555: daemon(1, 1);
1.362 djm 1556: setproctitle("%s [mux]", options.control_path);
1.344 djm 1557: }
1558:
1559: /* Do fork() after authentication. Used by "ssh -f" */
1560: static void
1561: fork_postauth(void)
1562: {
1563: if (need_controlpersist_detach)
1564: control_persist_detach();
1565: debug("forking to background");
1566: fork_after_authentication_flag = 0;
1567: if (daemon(1, 1) < 0)
1568: fatal("daemon() failed: %.200s", strerror(errno));
1569: }
1570:
1.315 djm 1571: /* Callback for remote forward global requests */
1572: static void
1.463 djm 1573: ssh_confirm_remote_forward(struct ssh *ssh, int type, u_int32_t seq, void *ctxt)
1.315 djm 1574: {
1.406 millert 1575: struct Forward *rfwd = (struct Forward *)ctxt;
1.315 djm 1576:
1.324 djm 1577: /* XXX verbose() on failure? */
1.404 markus 1578: debug("remote forward %s for: listen %s%s%d, connect %s:%d",
1.315 djm 1579: type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
1.406 millert 1580: rfwd->listen_path ? rfwd->listen_path :
1581: rfwd->listen_host ? rfwd->listen_host : "",
1582: (rfwd->listen_path || rfwd->listen_host) ? ":" : "",
1583: rfwd->listen_port, rfwd->connect_path ? rfwd->connect_path :
1584: rfwd->connect_host, rfwd->connect_port);
1585: if (rfwd->listen_path == NULL && rfwd->listen_port == 0) {
1.366 markus 1586: if (type == SSH2_MSG_REQUEST_SUCCESS) {
1587: rfwd->allocated_port = packet_get_int();
1588: logit("Allocated port %u for remote forward to %s:%d",
1589: rfwd->allocated_port,
1590: rfwd->connect_host, rfwd->connect_port);
1.463 djm 1591: channel_update_permitted_opens(ssh,
1592: rfwd->handle, rfwd->allocated_port);
1.366 markus 1593: } else {
1.463 djm 1594: channel_update_permitted_opens(ssh, rfwd->handle, -1);
1.366 markus 1595: }
1.324 djm 1596: }
1.468 djm 1597:
1.315 djm 1598: if (type == SSH2_MSG_REQUEST_FAILURE) {
1.406 millert 1599: if (options.exit_on_forward_failure) {
1600: if (rfwd->listen_path != NULL)
1601: fatal("Error: remote port forwarding failed "
1602: "for listen path %s", rfwd->listen_path);
1603: else
1604: fatal("Error: remote port forwarding failed "
1605: "for listen port %d", rfwd->listen_port);
1606: } else {
1607: if (rfwd->listen_path != NULL)
1608: logit("Warning: remote port forwarding failed "
1609: "for listen path %s", rfwd->listen_path);
1610: else
1611: logit("Warning: remote port forwarding failed "
1612: "for listen port %d", rfwd->listen_port);
1613: }
1.315 djm 1614: }
1.318 djm 1615: if (++remote_forward_confirms_received == options.num_remote_forwards) {
1.315 djm 1616: debug("All remote forwarding requests processed");
1.344 djm 1617: if (fork_after_authentication_flag)
1618: fork_postauth();
1.318 djm 1619: }
1.315 djm 1620: }
1621:
1.126 itojun 1622: static void
1.463 djm 1623: client_cleanup_stdio_fwd(struct ssh *ssh, int id, void *arg)
1.331 dtucker 1624: {
1625: debug("stdio forwarding: done");
1626: cleanup_exit(0);
1627: }
1628:
1.368 djm 1629: static void
1.463 djm 1630: ssh_stdio_confirm(struct ssh *ssh, int id, int success, void *arg)
1.407 djm 1631: {
1632: if (!success)
1633: fatal("stdio forwarding failed");
1634: }
1635:
1636: static void
1.463 djm 1637: ssh_init_stdio_forwarding(struct ssh *ssh)
1.331 dtucker 1638: {
1639: Channel *c;
1.332 djm 1640: int in, out;
1.331 dtucker 1641:
1.441 dtucker 1642: if (options.stdio_forward_host == NULL)
1.368 djm 1643: return;
1644:
1.441 dtucker 1645: debug3("%s: %s:%d", __func__, options.stdio_forward_host,
1646: options.stdio_forward_port);
1.332 djm 1647:
1.368 djm 1648: if ((in = dup(STDIN_FILENO)) < 0 ||
1649: (out = dup(STDOUT_FILENO)) < 0)
1.332 djm 1650: fatal("channel_connect_stdio_fwd: dup() in/out failed");
1.463 djm 1651: if ((c = channel_connect_stdio_fwd(ssh, options.stdio_forward_host,
1.441 dtucker 1652: options.stdio_forward_port, in, out)) == NULL)
1.368 djm 1653: fatal("%s: channel_connect_stdio_fwd failed", __func__);
1.463 djm 1654: channel_register_cleanup(ssh, c->self, client_cleanup_stdio_fwd, 0);
1655: channel_register_open_confirm(ssh, c->self, ssh_stdio_confirm, NULL);
1.331 dtucker 1656: }
1657:
1658: static void
1.466 djm 1659: ssh_init_forwarding(struct ssh *ssh, char **ifname)
1.70 markus 1660: {
1.86 markus 1661: int success = 0;
1.70 markus 1662: int i;
1.331 dtucker 1663:
1.70 markus 1664: /* Initiate local TCP/IP port forwardings. */
1665: for (i = 0; i < options.num_local_forwards; i++) {
1.232 djm 1666: debug("Local connections to %.200s:%d forwarded to remote "
1667: "address %.200s:%d",
1.406 millert 1668: (options.local_forwards[i].listen_path != NULL) ?
1669: options.local_forwards[i].listen_path :
1.234 deraadt 1670: (options.local_forwards[i].listen_host == NULL) ?
1.406 millert 1671: (options.fwd_opts.gateway_ports ? "*" : "LOCALHOST") :
1.232 djm 1672: options.local_forwards[i].listen_host,
1673: options.local_forwards[i].listen_port,
1.406 millert 1674: (options.local_forwards[i].connect_path != NULL) ?
1675: options.local_forwards[i].connect_path :
1.232 djm 1676: options.local_forwards[i].connect_host,
1677: options.local_forwards[i].connect_port);
1.463 djm 1678: success += channel_setup_local_fwd_listener(ssh,
1.406 millert 1679: &options.local_forwards[i], &options.fwd_opts);
1.70 markus 1680: }
1.283 markus 1681: if (i > 0 && success != i && options.exit_on_forward_failure)
1682: fatal("Could not request local forwarding.");
1.86 markus 1683: if (i > 0 && success == 0)
1684: error("Could not request local forwarding.");
1.70 markus 1685:
1686: /* Initiate remote TCP/IP port forwardings. */
1687: for (i = 0; i < options.num_remote_forwards; i++) {
1.232 djm 1688: debug("Remote connections from %.200s:%d forwarded to "
1689: "local address %.200s:%d",
1.406 millert 1690: (options.remote_forwards[i].listen_path != NULL) ?
1691: options.remote_forwards[i].listen_path :
1.248 djm 1692: (options.remote_forwards[i].listen_host == NULL) ?
1.253 djm 1693: "LOCALHOST" : options.remote_forwards[i].listen_host,
1.232 djm 1694: options.remote_forwards[i].listen_port,
1.406 millert 1695: (options.remote_forwards[i].connect_path != NULL) ?
1696: options.remote_forwards[i].connect_path :
1.232 djm 1697: options.remote_forwards[i].connect_host,
1698: options.remote_forwards[i].connect_port);
1.366 markus 1699: options.remote_forwards[i].handle =
1.463 djm 1700: channel_request_remote_forwarding(ssh,
1.406 millert 1701: &options.remote_forwards[i]);
1.366 markus 1702: if (options.remote_forwards[i].handle < 0) {
1.283 markus 1703: if (options.exit_on_forward_failure)
1704: fatal("Could not request remote forwarding.");
1705: else
1706: logit("Warning: Could not request remote "
1707: "forwarding.");
1.366 markus 1708: } else {
1.463 djm 1709: client_register_global_confirm(
1710: ssh_confirm_remote_forward,
1.366 markus 1711: &options.remote_forwards[i]);
1.283 markus 1712: }
1.70 markus 1713: }
1.301 djm 1714:
1715: /* Initiate tunnel forwarding. */
1716: if (options.tun_open != SSH_TUNMODE_NO) {
1.466 djm 1717: if ((*ifname = client_request_tun_fwd(ssh,
1718: options.tun_open, options.tun_local,
1719: options.tun_remote)) == NULL) {
1.301 djm 1720: if (options.exit_on_forward_failure)
1721: fatal("Could not request tunnel forwarding.");
1722: else
1723: error("Could not request tunnel forwarding.");
1724: }
1.468 djm 1725: }
1.70 markus 1726: }
1727:
1.126 itojun 1728: static void
1.70 markus 1729: check_agent_present(void)
1730: {
1.412 djm 1731: int r;
1732:
1.70 markus 1733: if (options.forward_agent) {
1.254 djm 1734: /* Clear agent forwarding if we don't have an agent. */
1.412 djm 1735: if ((r = ssh_get_authentication_socket(NULL)) != 0) {
1.70 markus 1736: options.forward_agent = 0;
1.412 djm 1737: if (r != SSH_ERR_AGENT_NOT_PRESENT)
1738: debug("ssh_get_authentication_socket: %s",
1739: ssh_err(r));
1740: }
1.70 markus 1741: }
1742: }
1743:
1.214 djm 1744: static void
1.463 djm 1745: ssh_session2_setup(struct ssh *ssh, int id, int success, void *arg)
1.214 djm 1746: {
1.215 djm 1747: extern char **environ;
1.243 djm 1748: const char *display;
1749: int interactive = tty_flag;
1.433 djm 1750: char *proto = NULL, *data = NULL;
1.337 djm 1751:
1752: if (!success)
1753: return; /* No need for error message, channels code sens one */
1.215 djm 1754:
1.248 djm 1755: display = getenv("DISPLAY");
1.417 djm 1756: if (display == NULL && options.forward_x11)
1757: debug("X11 forwarding requested but DISPLAY not set");
1.463 djm 1758: if (options.forward_x11 && client_x11_get_proto(ssh, display,
1.433 djm 1759: options.xauth_location, options.forward_x11_trusted,
1760: options.forward_x11_timeout, &proto, &data) == 0) {
1.50 markus 1761: /* Request forwarding with authentication spoofing. */
1.316 djm 1762: debug("Requesting X11 forwarding with authentication "
1763: "spoofing.");
1.463 djm 1764: x11_request_forwarding_with_spoofing(ssh, id, display, proto,
1.363 djm 1765: data, 1);
1.463 djm 1766: client_expect_confirm(ssh, id, "X11 forwarding", CONFIRM_WARN);
1.363 djm 1767: /* XXX exit_on_forward_failure */
1.80 markus 1768: interactive = 1;
1.50 markus 1769: }
1770:
1.70 markus 1771: check_agent_present();
1772: if (options.forward_agent) {
1773: debug("Requesting authentication agent forwarding.");
1.463 djm 1774: channel_request_start(ssh, id, "auth-agent-req@openssh.com", 0);
1.70 markus 1775: packet_send();
1.212 djm 1776: }
1.369 dtucker 1777:
1778: /* Tell the packet module whether this is an interactive session. */
1779: packet_set_interactive(interactive,
1780: options.ip_qos_interactive, options.ip_qos_bulk);
1.212 djm 1781:
1.463 djm 1782: client_session2_setup(ssh, id, tty_flag, subsystem_flag, getenv("TERM"),
1.311 djm 1783: NULL, fileno(stdin), &command, environ);
1.45 markus 1784: }
1785:
1.143 markus 1786: /* open new channel for a session */
1.126 itojun 1787: static int
1.463 djm 1788: ssh_session2_open(struct ssh *ssh)
1.45 markus 1789: {
1.118 markus 1790: Channel *c;
1791: int window, packetmax, in, out, err;
1.60 markus 1792:
1.62 markus 1793: if (stdin_null_flag) {
1.93 itojun 1794: in = open(_PATH_DEVNULL, O_RDONLY);
1.62 markus 1795: } else {
1796: in = dup(STDIN_FILENO);
1797: }
1.60 markus 1798: out = dup(STDOUT_FILENO);
1799: err = dup(STDERR_FILENO);
1.45 markus 1800:
1801: if (in < 0 || out < 0 || err < 0)
1.62 markus 1802: fatal("dup() in/out/err failed");
1.45 markus 1803:
1.69 markus 1804: /* enable nonblocking unless tty */
1805: if (!isatty(in))
1806: set_nonblock(in);
1807: if (!isatty(out))
1808: set_nonblock(out);
1809: if (!isatty(err))
1810: set_nonblock(err);
1811:
1.65 markus 1812: window = CHAN_SES_WINDOW_DEFAULT;
1813: packetmax = CHAN_SES_PACKET_DEFAULT;
1.164 markus 1814: if (tty_flag) {
1815: window >>= 1;
1816: packetmax >>= 1;
1.45 markus 1817: }
1.463 djm 1818: c = channel_new(ssh,
1.45 markus 1819: "session", SSH_CHANNEL_OPENING, in, out, err,
1.65 markus 1820: window, packetmax, CHAN_EXTENDED_WRITE,
1.192 markus 1821: "client-session", /*nonblock*/0);
1.45 markus 1822:
1.463 djm 1823: debug3("%s: channel_new: %d", __func__, c->self);
1.106 markus 1824:
1.463 djm 1825: channel_send_open(ssh, c->self);
1.143 markus 1826: if (!no_shell_flag)
1.463 djm 1827: channel_register_open_confirm(ssh, c->self,
1.310 djm 1828: ssh_session2_setup, NULL);
1.106 markus 1829:
1.118 markus 1830: return c->self;
1.106 markus 1831: }
1832:
1.126 itojun 1833: static int
1.466 djm 1834: ssh_session2(struct ssh *ssh, struct passwd *pw)
1.106 markus 1835: {
1.467 djm 1836: int devnull, id = -1;
1.466 djm 1837: char *cp, *tun_fwd_ifname = NULL;
1.106 markus 1838:
1839: /* XXX should be pre-session */
1.368 djm 1840: if (!options.control_persist)
1.463 djm 1841: ssh_init_stdio_forwarding(ssh);
1.466 djm 1842:
1843: ssh_init_forwarding(ssh, &tun_fwd_ifname);
1844:
1845: if (options.local_command != NULL) {
1846: debug3("expanding LocalCommand: %s", options.local_command);
1847: cp = options.local_command;
1848: options.local_command = percent_expand(cp,
1849: "C", conn_hash_hex,
1850: "L", shorthost,
1851: "d", pw->pw_dir,
1852: "h", host,
1853: "l", thishost,
1854: "n", host_arg,
1855: "p", portstr,
1856: "r", options.user,
1857: "u", pw->pw_name,
1858: "T", tun_fwd_ifname == NULL ? "NONE" : tun_fwd_ifname,
1859: (char *)NULL);
1860: debug3("expanded LocalCommand: %s", options.local_command);
1861: free(cp);
1862: }
1.106 markus 1863:
1.344 djm 1864: /* Start listening for multiplex clients */
1.447 markus 1865: if (!packet_get_mux())
1.463 djm 1866: muxserver_listen(ssh);
1.344 djm 1867:
1.473 djm 1868: /*
1.368 djm 1869: * If we are in control persist mode and have a working mux listen
1870: * socket, then prepare to background ourselves and have a foreground
1871: * client attach as a control slave.
1872: * NB. we must save copies of the flags that we override for
1.344 djm 1873: * the backgrounding, since we defer attachment of the slave until
1874: * after the connection is fully established (in particular,
1875: * async rfwd replies have been received for ExitOnForwardFailure).
1876: */
1.473 djm 1877: if (options.control_persist && muxserver_sock != -1) {
1.344 djm 1878: ostdin_null_flag = stdin_null_flag;
1879: ono_shell_flag = no_shell_flag;
1.359 djm 1880: orequest_tty = options.request_tty;
1.344 djm 1881: otty_flag = tty_flag;
1.473 djm 1882: stdin_null_flag = 1;
1883: no_shell_flag = 1;
1884: tty_flag = 0;
1.344 djm 1885: if (!fork_after_authentication_flag)
1886: need_controlpersist_detach = 1;
1887: fork_after_authentication_flag = 1;
1.473 djm 1888: }
1.368 djm 1889: /*
1890: * ControlPersist mux listen socket setup failed, attempt the
1891: * stdio forward setup that we skipped earlier.
1892: */
1893: if (options.control_persist && muxserver_sock == -1)
1.463 djm 1894: ssh_init_stdio_forwarding(ssh);
1.344 djm 1895:
1.471 djm 1896: if (!no_shell_flag)
1.463 djm 1897: id = ssh_session2_open(ssh);
1.379 djm 1898: else {
1899: packet_set_interactive(
1900: options.control_master == SSHCTL_MASTER_NO,
1901: options.ip_qos_interactive, options.ip_qos_bulk);
1902: }
1.314 djm 1903:
1904: /* If we don't expect to open a new session, then disallow it */
1.319 markus 1905: if (options.control_master == SSHCTL_MASTER_NO &&
1906: (datafellows & SSH_NEW_OPENSSH)) {
1.314 djm 1907: debug("Requesting no-more-sessions@openssh.com");
1908: packet_start(SSH2_MSG_GLOBAL_REQUEST);
1909: packet_put_cstring("no-more-sessions@openssh.com");
1910: packet_put_char(0);
1911: packet_send();
1912: }
1.255 reyk 1913:
1914: /* Execute a local command */
1915: if (options.local_command != NULL &&
1916: options.permit_local_command)
1917: ssh_local_cmd(options.local_command);
1.467 djm 1918:
1919: /*
1920: * stdout is now owned by the session channel; clobber it here
1921: * so future channel closes are propagated to the local fd.
1922: * NB. this can only happen after LocalCommand has completed,
1923: * as it may want to write to stdout.
1924: */
1.469 djm 1925: if (!need_controlpersist_detach) {
1926: if ((devnull = open(_PATH_DEVNULL, O_WRONLY)) == -1)
1927: error("%s: open %s: %s", __func__,
1928: _PATH_DEVNULL, strerror(errno));
1929: if (dup2(devnull, STDOUT_FILENO) < 0)
1930: fatal("%s: dup2() stdout failed", __func__);
1931: if (devnull > STDERR_FILENO)
1932: close(devnull);
1933: }
1.301 djm 1934:
1.342 djm 1935: /*
1936: * If requested and we are not interested in replies to remote
1937: * forwarding requests, then let ssh continue in the background.
1938: */
1.344 djm 1939: if (fork_after_authentication_flag) {
1940: if (options.exit_on_forward_failure &&
1941: options.num_remote_forwards > 0) {
1942: debug("deferring postauth fork until remote forward "
1943: "confirmation received");
1944: } else
1945: fork_postauth();
1.318 djm 1946: }
1.31 markus 1947:
1.463 djm 1948: return client_loop(ssh, tty_flag, tty_flag ?
1.119 stevesk 1949: options.escape_char : SSH_ESCAPECHAR_NONE, id);
1.72 markus 1950: }
1951:
1.426 djm 1952: /* Loads all IdentityFile and CertificateFile keys */
1.126 itojun 1953: static void
1.466 djm 1954: load_public_identity_files(struct passwd *pw)
1.104 markus 1955: {
1.466 djm 1956: char *filename, *cp;
1.460 markus 1957: struct sshkey *public;
1.426 djm 1958: int i;
1959: u_int n_ids, n_certs;
1.335 djm 1960: char *identity_files[SSH_MAX_IDENTITY_FILES];
1.460 markus 1961: struct sshkey *identity_keys[SSH_MAX_IDENTITY_FILES];
1.426 djm 1962: char *certificate_files[SSH_MAX_CERTIFICATE_FILES];
1963: struct sshkey *certificates[SSH_MAX_CERTIFICATE_FILES];
1.333 markus 1964: #ifdef ENABLE_PKCS11
1.460 markus 1965: struct sshkey **keys;
1.333 markus 1966: int nkeys;
1.335 djm 1967: #endif /* PKCS11 */
1.104 markus 1968:
1.426 djm 1969: n_ids = n_certs = 0;
1.398 tedu 1970: memset(identity_files, 0, sizeof(identity_files));
1971: memset(identity_keys, 0, sizeof(identity_keys));
1.426 djm 1972: memset(certificate_files, 0, sizeof(certificate_files));
1973: memset(certificates, 0, sizeof(certificates));
1.335 djm 1974:
1975: #ifdef ENABLE_PKCS11
1.333 markus 1976: if (options.pkcs11_provider != NULL &&
1.167 markus 1977: options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
1.333 markus 1978: (pkcs11_init(!options.batch_mode) == 0) &&
1979: (nkeys = pkcs11_add_provider(options.pkcs11_provider, NULL,
1980: &keys)) > 0) {
1981: for (i = 0; i < nkeys; i++) {
1.335 djm 1982: if (n_ids >= SSH_MAX_IDENTITY_FILES) {
1983: key_free(keys[i]);
1984: continue;
1985: }
1986: identity_keys[n_ids] = keys[i];
1987: identity_files[n_ids] =
1.333 markus 1988: xstrdup(options.pkcs11_provider); /* XXX */
1.335 djm 1989: n_ids++;
1.167 markus 1990: }
1.378 djm 1991: free(keys);
1.127 markus 1992: }
1.333 markus 1993: #endif /* ENABLE_PKCS11 */
1.275 djm 1994: if ((pw = getpwuid(original_real_uid)) == NULL)
1995: fatal("load_public_identity_files: getpwuid failed");
1.335 djm 1996: for (i = 0; i < options.num_identity_files; i++) {
1.373 djm 1997: if (n_ids >= SSH_MAX_IDENTITY_FILES ||
1998: strcasecmp(options.identity_files[i], "none") == 0) {
1.378 djm 1999: free(options.identity_files[i]);
1.426 djm 2000: options.identity_files[i] = NULL;
1.335 djm 2001: continue;
2002: }
1.275 djm 2003: cp = tilde_expand_filename(options.identity_files[i],
1.131 millert 2004: original_real_uid);
1.466 djm 2005: filename = percent_expand(cp, "d", pw->pw_dir,
2006: "u", pw->pw_name, "l", thishost, "h", host,
1.275 djm 2007: "r", options.user, (char *)NULL);
1.378 djm 2008: free(cp);
1.131 millert 2009: public = key_load_public(filename, NULL);
2010: debug("identity file %s type %d", filename,
2011: public ? public->type : -1);
1.378 djm 2012: free(options.identity_files[i]);
1.335 djm 2013: identity_files[n_ids] = filename;
2014: identity_keys[n_ids] = public;
2015:
2016: if (++n_ids >= SSH_MAX_IDENTITY_FILES)
2017: continue;
2018:
1.426 djm 2019: /*
2020: * If no certificates have been explicitly listed then try
2021: * to add the default certificate variant too.
2022: */
2023: if (options.num_certificate_files != 0)
2024: continue;
1.335 djm 2025: xasprintf(&cp, "%s-cert", filename);
2026: public = key_load_public(cp, NULL);
2027: debug("identity file %s type %d", cp,
2028: public ? public->type : -1);
2029: if (public == NULL) {
1.378 djm 2030: free(cp);
1.335 djm 2031: continue;
2032: }
2033: if (!key_is_cert(public)) {
2034: debug("%s: key %s type %s is not a certificate",
2035: __func__, cp, key_type(public));
2036: key_free(public);
1.378 djm 2037: free(cp);
1.335 djm 2038: continue;
2039: }
1.448 djm 2040: /* NB. leave filename pointing to private key */
2041: identity_files[n_ids] = xstrdup(filename);
1.335 djm 2042: identity_keys[n_ids] = public;
2043: n_ids++;
2044: }
1.426 djm 2045:
2046: if (options.num_certificate_files > SSH_MAX_CERTIFICATE_FILES)
2047: fatal("%s: too many certificates", __func__);
2048: for (i = 0; i < options.num_certificate_files; i++) {
2049: cp = tilde_expand_filename(options.certificate_files[i],
2050: original_real_uid);
1.466 djm 2051: filename = percent_expand(cp, "d", pw->pw_dir,
2052: "u", pw->pw_name, "l", thishost, "h", host,
1.426 djm 2053: "r", options.user, (char *)NULL);
2054: free(cp);
2055:
2056: public = key_load_public(filename, NULL);
2057: debug("certificate file %s type %d", filename,
2058: public ? public->type : -1);
2059: free(options.certificate_files[i]);
2060: options.certificate_files[i] = NULL;
2061: if (public == NULL) {
2062: free(filename);
2063: continue;
2064: }
2065: if (!key_is_cert(public)) {
2066: debug("%s: key %s type %s is not a certificate",
2067: __func__, filename, key_type(public));
2068: key_free(public);
2069: free(filename);
2070: continue;
2071: }
2072: certificate_files[n_certs] = filename;
2073: certificates[n_certs] = public;
2074: ++n_certs;
2075: }
2076:
1.335 djm 2077: options.num_identity_files = n_ids;
2078: memcpy(options.identity_files, identity_files, sizeof(identity_files));
2079: memcpy(options.identity_keys, identity_keys, sizeof(identity_keys));
1.426 djm 2080:
2081: options.num_certificate_files = n_certs;
2082: memcpy(options.certificate_files,
2083: certificate_files, sizeof(certificate_files));
2084: memcpy(options.certificates, certificates, sizeof(certificates));
1.214 djm 2085: }
1.352 djm 2086:
2087: static void
2088: main_sigchld_handler(int sig)
2089: {
2090: int save_errno = errno;
2091: pid_t pid;
2092: int status;
2093:
2094: while ((pid = waitpid(-1, &status, WNOHANG)) > 0 ||
2095: (pid < 0 && errno == EINTR))
2096: ;
2097: errno = save_errno;
2098: }
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