1 /* $OpenBSD: ssh.c,v 1.566 2021/08/08 08:49:09 dtucker Exp $ */
3 * Author: Tatu Ylonen <ylo@cs.hut.fi>
4 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
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.
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".
16 * Copyright (c) 1999 Niels Provos. All rights reserved.
17 * Copyright (c) 2000, 2001, 2002, 2003 Markus Friedl. All rights reserved.
19 * Modified to work with SSLeay by Niels Provos <provos@citi.umich.edu>
20 * in Canada (German citizen).
22 * Redistribution and use in source and binary forms, with or without
23 * modification, are permitted provided that the following conditions
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.
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.
46 #include <sys/types.h>
47 #ifdef HAVE_SYS_STAT_H
48 # include <sys/stat.h>
50 #include <sys/resource.h>
51 #include <sys/ioctl.h>
52 #include <sys/socket.h>
74 #include <netinet/in.h>
75 #include <arpa/inet.h>
78 #include <openssl/evp.h>
79 #include <openssl/err.h>
81 #include "openbsd-compat/openssl-compat.h"
82 #include "openbsd-compat/sys-queue.h"
96 #include "pathnames.h"
98 #include "clientloop.h"
101 #include "readconf.h"
102 #include "sshconnect.h"
110 #include "myproposal.h"
114 #include "ssh-pkcs11.h"
117 extern char *__progname;
119 /* Saves a copy of argv for setproctitle emulation */
120 #ifndef HAVE_SETPROCTITLE
121 static char **saved_av;
124 /* Flag indicating whether debug mode is on. May be set on the command line. */
127 /* Flag indicating whether a tty should be requested */
131 * Flag indicating that the current process should be backgrounded and
132 * a new mux-client launched in the foreground for ControlPersist.
134 int need_controlpersist_detach = 0;
136 /* Copies of flags for ControlPersist foreground mux-client */
137 int ostdin_null_flag, osession_type, otty_flag, orequest_tty;
140 * General data structure for command line options and options configurable
141 * in configuration files. See readconf.h.
145 /* optional user configfile */
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.
156 * A config can specify a path to forward, overriding SSH_AUTH_SOCK. If this is
157 * not NULL, forward the socket at this path instead.
159 char *forward_agent_sock_path = NULL;
161 /* socket address the host resolves to */
162 struct sockaddr_storage hostaddr;
164 /* Private host keys. */
165 Sensitive sensitive_data;
167 /* command to be executed */
168 struct sshbuf *command;
170 /* # of replies received for global requests */
171 static int forward_confirms_pending = -1;
174 extern int muxserver_sock;
175 extern u_int muxclient_command;
177 /* Prints a help message to the user. This function never returns. */
183 "usage: ssh [-46AaCfGgKkMNnqsTtVvXxYy] [-B bind_interface]\n"
184 " [-b bind_address] [-c cipher_spec] [-D [bind_address:]port]\n"
185 " [-E log_file] [-e escape_char] [-F configfile] [-I pkcs11]\n"
186 " [-i identity_file] [-J [user@]host[:port]] [-L address]\n"
187 " [-l login_name] [-m mac_spec] [-O ctl_cmd] [-o option] [-p port]\n"
188 " [-Q query_option] [-R address] [-S ctl_path] [-W host:port]\n"
189 " [-w local_tun[:remote_tun]] destination [command]\n"
194 static int ssh_session2(struct ssh *, const struct ssh_conn_info *);
195 static void load_public_identity_files(const struct ssh_conn_info *);
196 static void main_sigchld_handler(int);
198 /* ~/ expand a list of paths. NB. assumes path[n] is heap-allocated. */
200 tilde_expand_paths(char **paths, u_int num_paths)
205 for (i = 0; i < num_paths; i++) {
206 cp = tilde_expand_filename(paths[i], getuid());
213 * Expands the set of percent_expand options used by the majority of keywords
214 * in the client that support percent expansion.
215 * Caller must free returned string.
218 default_client_percent_expand(const char *str,
219 const struct ssh_conn_info *cinfo)
221 return percent_expand(str,
222 DEFAULT_CLIENT_PERCENT_EXPAND_ARGS(cinfo),
227 * Expands the set of percent_expand options used by the majority of keywords
228 * AND perform environment variable substitution.
229 * Caller must free returned string.
232 default_client_percent_dollar_expand(const char *str,
233 const struct ssh_conn_info *cinfo)
237 ret = percent_dollar_expand(str,
238 DEFAULT_CLIENT_PERCENT_EXPAND_ARGS(cinfo),
241 fatal("invalid environment variable expansion");
246 * Attempt to resolve a host name / port to a set of addresses and
247 * optionally return any CNAMEs encountered along the way.
248 * Returns NULL on failure.
249 * NB. this function must operate with a options having undefined members.
251 static struct addrinfo *
252 resolve_host(const char *name, int port, int logerr, char *cname, size_t clen)
254 char strport[NI_MAXSERV];
255 struct addrinfo hints, *res;
257 LogLevel loglevel = SYSLOG_LEVEL_DEBUG1;
260 port = default_ssh_port();
264 snprintf(strport, sizeof strport, "%d", port);
265 memset(&hints, 0, sizeof(hints));
266 hints.ai_family = options.address_family == -1 ?
267 AF_UNSPEC : options.address_family;
268 hints.ai_socktype = SOCK_STREAM;
270 hints.ai_flags = AI_CANONNAME;
271 if ((gaierr = getaddrinfo(name, strport, &hints, &res)) != 0) {
272 if (logerr || (gaierr != EAI_NONAME && gaierr != EAI_NODATA))
273 loglevel = SYSLOG_LEVEL_ERROR;
274 do_log2(loglevel, "%s: Could not resolve hostname %.100s: %s",
275 __progname, name, ssh_gai_strerror(gaierr));
278 if (cname != NULL && res->ai_canonname != NULL) {
279 if (strlcpy(cname, res->ai_canonname, clen) >= clen) {
280 error_f("host \"%s\" cname \"%s\" too long (max %lu)",
281 name, res->ai_canonname, (u_long)clen);
289 /* Returns non-zero if name can only be an address and not a hostname */
291 is_addr_fast(const char *name)
293 return (strchr(name, '%') != NULL || strchr(name, ':') != NULL ||
294 strspn(name, "0123456789.") == strlen(name));
297 /* Returns non-zero if name represents a valid, single address */
299 is_addr(const char *name)
301 char strport[NI_MAXSERV];
302 struct addrinfo hints, *res;
304 if (is_addr_fast(name))
307 snprintf(strport, sizeof strport, "%u", default_ssh_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 (getaddrinfo(name, strport, &hints, &res) != 0)
315 if (res == NULL || res->ai_next != NULL) {
324 * Attempt to resolve a numeric host address / port to a single address.
325 * Returns a canonical address string.
326 * Returns NULL on failure.
327 * NB. this function must operate with a options having undefined members.
329 static struct addrinfo *
330 resolve_addr(const char *name, int port, char *caddr, size_t clen)
332 char addr[NI_MAXHOST], strport[NI_MAXSERV];
333 struct addrinfo hints, *res;
337 port = default_ssh_port();
338 snprintf(strport, sizeof strport, "%u", port);
339 memset(&hints, 0, sizeof(hints));
340 hints.ai_family = options.address_family == -1 ?
341 AF_UNSPEC : options.address_family;
342 hints.ai_socktype = SOCK_STREAM;
343 hints.ai_flags = AI_NUMERICHOST|AI_NUMERICSERV;
344 if ((gaierr = getaddrinfo(name, strport, &hints, &res)) != 0) {
345 debug2_f("could not resolve name %.100s as address: %s",
346 name, ssh_gai_strerror(gaierr));
350 debug_f("getaddrinfo %.100s returned no addresses", name);
353 if (res->ai_next != NULL) {
354 debug_f("getaddrinfo %.100s returned multiple addresses", name);
357 if ((gaierr = getnameinfo(res->ai_addr, res->ai_addrlen,
358 addr, sizeof(addr), NULL, 0, NI_NUMERICHOST)) != 0) {
359 debug_f("Could not format address for name %.100s: %s",
360 name, ssh_gai_strerror(gaierr));
363 if (strlcpy(caddr, addr, clen) >= clen) {
364 error_f("host \"%s\" addr \"%s\" too long (max %lu)",
365 name, addr, (u_long)clen);
376 * Check whether the cname is a permitted replacement for the hostname
377 * and perform the replacement if it is.
378 * NB. this function must operate with a options having undefined members.
381 check_follow_cname(int direct, char **namep, const char *cname)
384 struct allowed_cname *rule;
386 if (*cname == '\0' || options.num_permitted_cnames == 0 ||
387 strcmp(*namep, cname) == 0)
389 if (options.canonicalize_hostname == SSH_CANONICALISE_NO)
392 * Don't attempt to canonicalize names that will be interpreted by
393 * a proxy or jump host unless the user specifically requests so.
396 options.canonicalize_hostname != SSH_CANONICALISE_ALWAYS)
398 debug3_f("check \"%s\" CNAME \"%s\"", *namep, cname);
399 for (i = 0; i < options.num_permitted_cnames; i++) {
400 rule = options.permitted_cnames + i;
401 if (match_pattern_list(*namep, rule->source_list, 1) != 1 ||
402 match_pattern_list(cname, rule->target_list, 1) != 1)
404 verbose("Canonicalized DNS aliased hostname "
405 "\"%s\" => \"%s\"", *namep, cname);
407 *namep = xstrdup(cname);
414 * Attempt to resolve the supplied hostname after applying the user's
415 * canonicalization rules. Returns the address list for the host or NULL
416 * if no name was found after canonicalization.
417 * NB. this function must operate with a options having undefined members.
419 static struct addrinfo *
420 resolve_canonicalize(char **hostp, int port)
422 int i, direct, ndots;
423 char *cp, *fullhost, newname[NI_MAXHOST];
424 struct addrinfo *addrs;
427 * Attempt to canonicalise addresses, regardless of
428 * whether hostname canonicalisation was requested
430 if ((addrs = resolve_addr(*hostp, port,
431 newname, sizeof(newname))) != NULL) {
432 debug2_f("hostname %.100s is address", *hostp);
433 if (strcasecmp(*hostp, newname) != 0) {
434 debug2_f("canonicalised address \"%s\" => \"%s\"",
437 *hostp = xstrdup(newname);
443 * If this looks like an address but didn't parse as one, it might
444 * be an address with an invalid interface scope. Skip further
445 * attempts at canonicalisation.
447 if (is_addr_fast(*hostp)) {
448 debug_f("hostname %.100s is an unrecognised address", *hostp);
452 if (options.canonicalize_hostname == SSH_CANONICALISE_NO)
456 * Don't attempt to canonicalize names that will be interpreted by
457 * a proxy unless the user specifically requests so.
459 direct = option_clear_or_none(options.proxy_command) &&
460 options.jump_host == NULL;
462 options.canonicalize_hostname != SSH_CANONICALISE_ALWAYS)
465 /* If domain name is anchored, then resolve it now */
466 if ((*hostp)[strlen(*hostp) - 1] == '.') {
467 debug3_f("name is fully qualified");
468 fullhost = xstrdup(*hostp);
469 if ((addrs = resolve_host(fullhost, port, 0,
470 newname, sizeof(newname))) != NULL)
476 /* Don't apply canonicalization to sufficiently-qualified hostnames */
478 for (cp = *hostp; *cp != '\0'; cp++) {
482 if (ndots > options.canonicalize_max_dots) {
483 debug3_f("not canonicalizing hostname \"%s\" (max dots %d)",
484 *hostp, options.canonicalize_max_dots);
487 /* Attempt each supplied suffix */
488 for (i = 0; i < options.num_canonical_domains; i++) {
489 if (strcasecmp(options.canonical_domains[i], "none") == 0)
491 xasprintf(&fullhost, "%s.%s.", *hostp,
492 options.canonical_domains[i]);
493 debug3_f("attempting \"%s\" => \"%s\"", *hostp, fullhost);
494 if ((addrs = resolve_host(fullhost, port, 0,
495 newname, sizeof(newname))) == NULL) {
500 /* Remove trailing '.' */
501 fullhost[strlen(fullhost) - 1] = '\0';
502 /* Follow CNAME if requested */
503 if (!check_follow_cname(direct, &fullhost, newname)) {
504 debug("Canonicalized hostname \"%s\" => \"%s\"",
512 if (!options.canonicalize_fallback_local)
513 fatal("%s: Could not resolve host \"%s\"", __progname, *hostp);
514 debug2_f("host %s not found in any suffix", *hostp);
519 * Check the result of hostkey loading, ignoring some errors and
520 * fatal()ing for others.
523 check_load(int r, const char *path, const char *message)
528 case SSH_ERR_INTERNAL_ERROR:
529 case SSH_ERR_ALLOC_FAIL:
530 fatal_r(r, "load %s \"%s\"", message, path);
531 case SSH_ERR_SYSTEM_ERROR:
532 /* Ignore missing files */
537 error_r(r, "load %s \"%s\"", message, path);
543 * Read per-user configuration file. Ignore the system wide config
544 * file if the user specifies a config file on the command line.
547 process_config_files(const char *host_name, struct passwd *pw, int final_pass,
548 int *want_final_pass)
553 if (config != NULL) {
554 if (strcasecmp(config, "none") != 0 &&
555 !read_config_file(config, pw, host, host_name, &options,
556 SSHCONF_USERCONF | (final_pass ? SSHCONF_FINAL : 0),
558 fatal("Can't open user config file %.100s: "
559 "%.100s", config, strerror(errno));
561 r = snprintf(buf, sizeof buf, "%s/%s", pw->pw_dir,
562 _PATH_SSH_USER_CONFFILE);
563 if (r > 0 && (size_t)r < sizeof(buf))
564 (void)read_config_file(buf, pw, host, host_name,
565 &options, SSHCONF_CHECKPERM | SSHCONF_USERCONF |
566 (final_pass ? SSHCONF_FINAL : 0), want_final_pass);
568 /* Read systemwide configuration file after user config. */
569 (void)read_config_file(_PATH_HOST_CONFIG_FILE, pw,
570 host, host_name, &options,
571 final_pass ? SSHCONF_FINAL : 0, want_final_pass);
575 /* Rewrite the port number in an addrinfo list of addresses */
577 set_addrinfo_port(struct addrinfo *addrs, int port)
579 struct addrinfo *addr;
581 for (addr = addrs; addr != NULL; addr = addr->ai_next) {
582 switch (addr->ai_family) {
584 ((struct sockaddr_in *)addr->ai_addr)->
585 sin_port = htons(port);
588 ((struct sockaddr_in6 *)addr->ai_addr)->
589 sin6_port = htons(port);
596 ssh_conn_info_free(struct ssh_conn_info *cinfo)
600 free(cinfo->conn_hash_hex);
601 free(cinfo->shorthost);
603 free(cinfo->keyalias);
604 free(cinfo->thishost);
605 free(cinfo->host_arg);
606 free(cinfo->portstr);
607 free(cinfo->remhost);
608 free(cinfo->remuser);
609 free(cinfo->homedir);
610 free(cinfo->locuser);
615 * Main program for the ssh client.
618 main(int ac, char **av)
620 struct ssh *ssh = NULL;
621 int i, r, opt, exit_status, use_syslog, direct, timeout_ms;
622 int was_addr, config_test = 0, opt_terminated = 0, want_final_pass = 0;
623 char *p, *cp, *line, *argv0, *logfile, *host_arg;
624 char cname[NI_MAXHOST], thishost[NI_MAXHOST];
627 extern int optind, optreset;
630 struct addrinfo *addrs = NULL;
633 struct ssh_conn_info *cinfo = NULL;
635 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
639 * Discard other fds that are hanging around. These can cause problem
640 * with backgrounded ssh processes started by ControlPersist.
642 closefrom(STDERR_FILENO + 1);
644 __progname = ssh_get_progname(av[0]);
646 #ifndef HAVE_SETPROCTITLE
647 /* Prepare for later setproctitle emulation */
648 /* Save argv so it isn't clobbered by setproctitle() emulation */
649 saved_av = xcalloc(ac + 1, sizeof(*saved_av));
650 for (i = 0; i < ac; i++)
651 saved_av[i] = xstrdup(av[i]);
653 compat_init_setproctitle(ac, av);
660 pw = getpwuid(getuid());
662 logit("No user exists for uid %lu", (u_long)getuid());
665 /* Take a copy of the returned structure. */
669 * Set our umask to something reasonable, as some files are created
670 * with the default umask. This will make them world-readable but
671 * writable only by the owner, which is ok for all files for which we
672 * don't set the modes explicitly.
679 * Initialize option structure to indicate that no values have been
682 initialize_options(&options);
685 * Prepare main ssh transport/connection structures
687 if ((ssh = ssh_alloc_session_state()) == NULL)
688 fatal("Couldn't allocate session state");
689 channel_init_channels(ssh);
691 /* Parse command-line arguments. */
698 while ((opt = getopt(ac, av, "1246ab:c:e:fgi:kl:m:no:p:qstvx"
699 "AB:CD:E:F:GI:J:KL:MNO:PQ:R:S:TVw:W:XYy")) != -1) {
702 fatal("SSH protocol v.1 is no longer supported");
708 options.address_family = AF_INET;
711 options.address_family = AF_INET6;
714 options.stdin_null = 1;
717 options.fork_after_authentication = 1;
718 options.stdin_null = 1;
721 options.forward_x11 = 0;
724 options.forward_x11 = 1;
736 options.forward_x11 = 1;
737 options.forward_x11_trusted = 1;
740 options.fwd_opts.gateway_ports = 1;
743 if (options.stdio_forward_host != NULL)
744 fatal("Cannot specify multiplexing "
746 else if (muxclient_command != 0)
747 fatal("Multiplexing command already specified");
748 if (strcmp(optarg, "check") == 0)
749 muxclient_command = SSHMUX_COMMAND_ALIVE_CHECK;
750 else if (strcmp(optarg, "forward") == 0)
751 muxclient_command = SSHMUX_COMMAND_FORWARD;
752 else if (strcmp(optarg, "exit") == 0)
753 muxclient_command = SSHMUX_COMMAND_TERMINATE;
754 else if (strcmp(optarg, "stop") == 0)
755 muxclient_command = SSHMUX_COMMAND_STOP;
756 else if (strcmp(optarg, "cancel") == 0)
757 muxclient_command = SSHMUX_COMMAND_CANCEL_FWD;
758 else if (strcmp(optarg, "proxy") == 0)
759 muxclient_command = SSHMUX_COMMAND_PROXY;
761 fatal("Invalid multiplex command.");
763 case 'P': /* deprecated */
767 if (strcmp(optarg, "cipher") == 0 ||
768 strcasecmp(optarg, "Ciphers") == 0)
769 cp = cipher_alg_list('\n', 0);
770 else if (strcmp(optarg, "cipher-auth") == 0)
771 cp = cipher_alg_list('\n', 1);
772 else if (strcmp(optarg, "mac") == 0 ||
773 strcasecmp(optarg, "MACs") == 0)
774 cp = mac_alg_list('\n');
775 else if (strcmp(optarg, "kex") == 0 ||
776 strcasecmp(optarg, "KexAlgorithms") == 0)
777 cp = kex_alg_list('\n');
778 else if (strcmp(optarg, "key") == 0)
779 cp = sshkey_alg_list(0, 0, 0, '\n');
780 else if (strcmp(optarg, "key-cert") == 0)
781 cp = sshkey_alg_list(1, 0, 0, '\n');
782 else if (strcmp(optarg, "key-plain") == 0)
783 cp = sshkey_alg_list(0, 1, 0, '\n');
784 else if (strcmp(optarg, "key-sig") == 0 ||
785 strcasecmp(optarg, "PubkeyAcceptedKeyTypes") == 0 || /* deprecated name */
786 strcasecmp(optarg, "PubkeyAcceptedAlgorithms") == 0 ||
787 strcasecmp(optarg, "HostKeyAlgorithms") == 0 ||
788 strcasecmp(optarg, "HostbasedKeyTypes") == 0 || /* deprecated name */
789 strcasecmp(optarg, "HostbasedAcceptedKeyTypes") == 0 || /* deprecated name */
790 strcasecmp(optarg, "HostbasedAcceptedAlgorithms") == 0)
791 cp = sshkey_alg_list(0, 0, 1, '\n');
792 else if (strcmp(optarg, "sig") == 0)
793 cp = sshkey_alg_list(0, 1, 1, '\n');
794 else if (strcmp(optarg, "protocol-version") == 0)
796 else if (strcmp(optarg, "compression") == 0) {
797 cp = xstrdup(compression_alg_list(0));
799 for (n = 0; n < len; n++)
802 } else if (strcmp(optarg, "help") == 0) {
804 "cipher\ncipher-auth\ncompression\nkex\n"
805 "key\nkey-cert\nkey-plain\nkey-sig\nmac\n"
806 "protocol-version\nsig");
809 fatal("Unsupported query \"%s\"", optarg);
815 options.forward_agent = 0;
818 options.forward_agent = 1;
821 options.gss_deleg_creds = 0;
824 options.gss_authentication = 1;
825 options.gss_deleg_creds = 1;
828 p = tilde_expand_filename(optarg, getuid());
829 if (stat(p, &st) == -1)
830 fprintf(stderr, "Warning: Identity file %s "
831 "not accessible: %s.\n", p,
834 add_identity_file(&options, NULL, p, 1);
839 free(options.pkcs11_provider);
840 options.pkcs11_provider = xstrdup(optarg);
842 fprintf(stderr, "no support for PKCS#11.\n");
846 if (options.jump_host != NULL) {
847 fatal("Only a single -J option is permitted "
848 "(use commas to separate multiple "
851 if (options.proxy_command != NULL)
852 fatal("Cannot specify -J with ProxyCommand");
853 if (parse_jump(optarg, &options, 1) == -1)
854 fatal("Invalid -J argument");
855 options.proxy_command = xstrdup("none");
858 if (options.request_tty == REQUEST_TTY_YES)
859 options.request_tty = REQUEST_TTY_FORCE;
861 options.request_tty = REQUEST_TTY_YES;
864 if (debug_flag == 0) {
866 options.log_level = SYSLOG_LEVEL_DEBUG1;
868 if (options.log_level < SYSLOG_LEVEL_DEBUG3) {
875 if (options.version_addendum &&
876 *options.version_addendum != '\0')
877 fprintf(stderr, "%s %s, %s\n", SSH_RELEASE,
878 options.version_addendum,
879 OPENSSL_VERSION_STRING);
881 fprintf(stderr, "%s, %s\n", SSH_RELEASE,
882 OPENSSL_VERSION_STRING);
887 if (options.tun_open == -1)
888 options.tun_open = SSH_TUNMODE_DEFAULT;
889 options.tun_local = a2tun(optarg, &options.tun_remote);
890 if (options.tun_local == SSH_TUNID_ERR) {
892 "Bad tun device '%s'\n", optarg);
897 if (options.stdio_forward_host != NULL)
898 fatal("stdio forward already specified");
899 if (muxclient_command != 0)
900 fatal("Cannot specify stdio forward with -O");
901 if (parse_forward(&fwd, optarg, 1, 0)) {
902 options.stdio_forward_host = fwd.listen_host;
903 options.stdio_forward_port = fwd.listen_port;
904 free(fwd.connect_host);
907 "Bad stdio forwarding specification '%s'\n",
911 options.request_tty = REQUEST_TTY_NO;
912 options.session_type = SESSION_TYPE_NONE;
915 options.log_level = SYSLOG_LEVEL_QUIET;
918 if (optarg[0] == '^' && optarg[2] == 0 &&
919 (u_char) optarg[1] >= 64 &&
920 (u_char) optarg[1] < 128)
921 options.escape_char = (u_char) optarg[1] & 31;
922 else if (strlen(optarg) == 1)
923 options.escape_char = (u_char) optarg[0];
924 else if (strcmp(optarg, "none") == 0)
925 options.escape_char = SSH_ESCAPECHAR_NONE;
927 fprintf(stderr, "Bad escape character '%s'.\n",
933 if (!ciphers_valid(*optarg == '+' || *optarg == '^' ?
934 optarg + 1 : optarg)) {
935 fprintf(stderr, "Unknown cipher type '%s'\n",
939 free(options.ciphers);
940 options.ciphers = xstrdup(optarg);
943 if (mac_valid(optarg)) {
945 options.macs = xstrdup(optarg);
947 fprintf(stderr, "Unknown mac type '%s'\n",
953 if (options.control_master == SSHCTL_MASTER_YES)
954 options.control_master = SSHCTL_MASTER_ASK;
956 options.control_master = SSHCTL_MASTER_YES;
959 if (options.port == -1) {
960 options.port = a2port(optarg);
961 if (options.port <= 0) {
962 fprintf(stderr, "Bad port '%s'\n",
969 if (options.user == NULL)
970 options.user = optarg;
974 if (parse_forward(&fwd, optarg, 0, 0))
975 add_local_forward(&options, &fwd);
978 "Bad local forwarding specification '%s'\n",
985 if (parse_forward(&fwd, optarg, 0, 1) ||
986 parse_forward(&fwd, optarg, 1, 1)) {
987 add_remote_forward(&options, &fwd);
990 "Bad remote forwarding specification "
997 if (parse_forward(&fwd, optarg, 1, 0)) {
998 add_local_forward(&options, &fwd);
1001 "Bad dynamic forwarding specification "
1009 options.compression = 1;
1011 error("Compression not supported, disabling.");
1015 if (options.session_type != -1 &&
1016 options.session_type != SESSION_TYPE_NONE)
1017 fatal("Cannot specify -N with -s/SessionType");
1018 options.session_type = SESSION_TYPE_NONE;
1019 options.request_tty = REQUEST_TTY_NO;
1022 options.request_tty = REQUEST_TTY_NO;
1025 line = xstrdup(optarg);
1026 if (process_config_line(&options, pw,
1027 host ? host : "", host ? host : "", line,
1028 "command-line", 0, NULL, SSHCONF_USERCONF) != 0)
1033 if (options.session_type != -1 &&
1034 options.session_type != SESSION_TYPE_SUBSYSTEM)
1035 fatal("Cannot specify -s with -N/SessionType");
1036 options.session_type = SESSION_TYPE_SUBSYSTEM;
1039 free(options.control_path);
1040 options.control_path = xstrdup(optarg);
1043 options.bind_address = optarg;
1046 options.bind_interface = optarg;
1056 if (optind > 1 && strcmp(av[optind - 1], "--") == 0)
1062 if (ac > 0 && !host) {
1065 switch (parse_ssh_uri(*av, &tuser, &host, &tport)) {
1070 if (options.user == NULL) {
1071 options.user = tuser;
1075 if (options.port == -1 && tport != -1)
1076 options.port = tport;
1080 cp = strrchr(p, '@');
1084 if (options.user == NULL) {
1095 if (ac > 1 && !opt_terminated) {
1096 optind = optreset = 1;
1102 /* Check that we got a host name. */
1106 host_arg = xstrdup(host);
1108 /* Initialize the command to execute on remote host. */
1109 if ((command = sshbuf_new()) == NULL)
1110 fatal("sshbuf_new failed");
1113 * Save the command to execute on the remote host in a buffer. There
1114 * is no limit on the length of the command, except by the maximum
1115 * packet size. Also sets the tty flag if there is no command.
1118 /* No command specified - execute shell on a tty. */
1119 if (options.session_type == SESSION_TYPE_SUBSYSTEM) {
1121 "You must specify a subsystem to invoke.\n");
1125 /* A command has been specified. Store it into the buffer. */
1126 for (i = 0; i < ac; i++) {
1127 if ((r = sshbuf_putf(command, "%s%s",
1128 i ? " " : "", av[i])) != 0)
1129 fatal_fr(r, "buffer error");
1134 * Initialize "log" output. Since we are the client all output
1135 * goes to stderr unless otherwise specified by -y or -E.
1137 if (use_syslog && logfile != NULL)
1138 fatal("Can't specify both -y and -E");
1139 if (logfile != NULL)
1140 log_redirect_stderr_to(logfile);
1142 options.log_level == SYSLOG_LEVEL_NOT_SET ?
1143 SYSLOG_LEVEL_INFO : options.log_level,
1144 options.log_facility == SYSLOG_FACILITY_NOT_SET ?
1145 SYSLOG_FACILITY_USER : options.log_facility,
1149 /* version_addendum is always NULL at this point */
1150 logit("%s, %s", SSH_RELEASE, OPENSSL_VERSION_STRING);
1152 /* Parse the configuration files */
1153 process_config_files(host_arg, pw, 0, &want_final_pass);
1154 if (want_final_pass)
1155 debug("configuration requests final Match pass");
1157 /* Hostname canonicalisation needs a few options filled. */
1158 fill_default_options_for_canonicalization(&options);
1160 /* If the user has replaced the hostname then take it into use now */
1161 if (options.hostname != NULL) {
1162 /* NB. Please keep in sync with readconf.c:match_cfg_line() */
1163 cp = percent_expand(options.hostname,
1164 "h", host, (char *)NULL);
1167 free(options.hostname);
1168 options.hostname = xstrdup(host);
1171 /* Don't lowercase addresses, they will be explicitly canonicalised */
1172 if ((was_addr = is_addr(host)) == 0)
1176 * Try to canonicalize if requested by configuration or the
1177 * hostname is an address.
1179 if (options.canonicalize_hostname != SSH_CANONICALISE_NO || was_addr)
1180 addrs = resolve_canonicalize(&host, options.port);
1183 * If CanonicalizePermittedCNAMEs have been specified but
1184 * other canonicalization did not happen (by not being requested
1185 * or by failing with fallback) then the hostname may still be changed
1186 * as a result of CNAME following.
1188 * Try to resolve the bare hostname name using the system resolver's
1189 * usual search rules and then apply the CNAME follow rules.
1191 * Skip the lookup if a ProxyCommand is being used unless the user
1192 * has specifically requested canonicalisation for this case via
1193 * CanonicalizeHostname=always
1195 direct = option_clear_or_none(options.proxy_command) &&
1196 options.jump_host == NULL;
1197 if (addrs == NULL && options.num_permitted_cnames != 0 && (direct ||
1198 options.canonicalize_hostname == SSH_CANONICALISE_ALWAYS)) {
1199 if ((addrs = resolve_host(host, options.port,
1200 direct, cname, sizeof(cname))) == NULL) {
1201 /* Don't fatal proxied host names not in the DNS */
1203 cleanup_exit(255); /* logged in resolve_host */
1205 check_follow_cname(direct, &host, cname);
1209 * If canonicalisation is enabled then re-parse the configuration
1210 * files as new stanzas may match.
1212 if (options.canonicalize_hostname != 0 && !want_final_pass) {
1213 debug("hostname canonicalisation enabled, "
1214 "will re-parse configuration");
1215 want_final_pass = 1;
1218 if (want_final_pass) {
1219 debug("re-parsing configuration");
1220 free(options.hostname);
1221 options.hostname = xstrdup(host);
1222 process_config_files(host_arg, pw, 1, NULL);
1224 * Address resolution happens early with canonicalisation
1225 * enabled and the port number may have changed since, so
1226 * reset it in address list
1228 if (addrs != NULL && options.port > 0)
1229 set_addrinfo_port(addrs, options.port);
1232 /* Fill configuration defaults. */
1233 if (fill_default_options(&options) != 0)
1236 if (options.user == NULL)
1237 options.user = xstrdup(pw->pw_name);
1240 * If ProxyJump option specified, then construct a ProxyCommand now.
1242 if (options.jump_host != NULL) {
1244 const char *jumpuser = options.jump_user, *sshbin = argv0;
1245 int port = options.port, jumpport = options.jump_port;
1248 port = default_ssh_port();
1250 jumpport = default_ssh_port();
1251 if (jumpuser == NULL)
1252 jumpuser = options.user;
1253 if (strcmp(options.jump_host, host) == 0 && port == jumpport &&
1254 strcmp(options.user, jumpuser) == 0)
1255 fatal("jumphost loop via %s", options.jump_host);
1258 * Try to use SSH indicated by argv[0], but fall back to
1259 * "ssh" if it appears unavailable.
1261 if (strchr(argv0, '/') != NULL && access(argv0, X_OK) != 0)
1264 /* Consistency check */
1265 if (options.proxy_command != NULL)
1266 fatal("inconsistent options: ProxyCommand+ProxyJump");
1267 /* Never use FD passing for ProxyJump */
1268 options.proxy_use_fdpass = 0;
1269 snprintf(port_s, sizeof(port_s), "%d", options.jump_port);
1270 xasprintf(&options.proxy_command,
1271 "%s%s%s%s%s%s%s%s%s%s%.*s -W '[%%h]:%%p' %s",
1273 /* Optional "-l user" argument if jump_user set */
1274 options.jump_user == NULL ? "" : " -l ",
1275 options.jump_user == NULL ? "" : options.jump_user,
1276 /* Optional "-p port" argument if jump_port set */
1277 options.jump_port <= 0 ? "" : " -p ",
1278 options.jump_port <= 0 ? "" : port_s,
1279 /* Optional additional jump hosts ",..." */
1280 options.jump_extra == NULL ? "" : " -J ",
1281 options.jump_extra == NULL ? "" : options.jump_extra,
1282 /* Optional "-F" argumment if -F specified */
1283 config == NULL ? "" : " -F ",
1284 config == NULL ? "" : config,
1285 /* Optional "-v" arguments if -v set */
1286 debug_flag ? " -" : "",
1288 /* Mandatory hostname */
1290 debug("Setting implicit ProxyCommand from ProxyJump: %s",
1291 options.proxy_command);
1294 if (options.port == 0)
1295 options.port = default_ssh_port();
1296 channel_set_af(ssh, options.address_family);
1298 /* Tidy and check options */
1299 if (options.host_key_alias != NULL)
1300 lowercase(options.host_key_alias);
1301 if (options.proxy_command != NULL &&
1302 strcmp(options.proxy_command, "-") == 0 &&
1303 options.proxy_use_fdpass)
1304 fatal("ProxyCommand=- and ProxyUseFDPass are incompatible");
1305 if (options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK) {
1306 if (options.control_persist && options.control_path != NULL) {
1307 debug("UpdateHostKeys=ask is incompatible with "
1308 "ControlPersist; disabling");
1309 options.update_hostkeys = 0;
1310 } else if (sshbuf_len(command) != 0 ||
1311 options.remote_command != NULL ||
1312 options.request_tty == REQUEST_TTY_NO) {
1313 debug("UpdateHostKeys=ask is incompatible with "
1314 "remote command execution; disabling");
1315 options.update_hostkeys = 0;
1316 } else if (options.log_level < SYSLOG_LEVEL_INFO) {
1317 /* no point logging anything; user won't see it */
1318 options.update_hostkeys = 0;
1321 if (options.connection_attempts <= 0)
1322 fatal("Invalid number of ConnectionAttempts");
1324 if (sshbuf_len(command) != 0 && options.remote_command != NULL)
1325 fatal("Cannot execute command-line and remote command.");
1327 /* Cannot fork to background if no command. */
1328 if (options.fork_after_authentication && sshbuf_len(command) == 0 &&
1329 options.remote_command == NULL &&
1330 options.session_type != SESSION_TYPE_NONE)
1331 fatal("Cannot fork into background without a command "
1335 log_init(argv0, options.log_level, options.log_facility, !use_syslog);
1336 for (j = 0; j < options.num_log_verbose; j++) {
1337 if (strcasecmp(options.log_verbose[j], "none") == 0)
1339 log_verbose_add(options.log_verbose[j]);
1342 if (options.request_tty == REQUEST_TTY_YES ||
1343 options.request_tty == REQUEST_TTY_FORCE)
1346 /* Allocate a tty by default if no command specified. */
1347 if (sshbuf_len(command) == 0 && options.remote_command == NULL)
1348 tty_flag = options.request_tty != REQUEST_TTY_NO;
1351 if (options.request_tty == REQUEST_TTY_NO ||
1352 (muxclient_command && muxclient_command != SSHMUX_COMMAND_PROXY))
1354 /* Do not allocate a tty if stdin is not a tty. */
1355 if ((!isatty(fileno(stdin)) || options.stdin_null) &&
1356 options.request_tty != REQUEST_TTY_FORCE) {
1358 logit("Pseudo-terminal will not be allocated because "
1359 "stdin is not a terminal.");
1363 /* Set up strings used to percent_expand() arguments */
1364 cinfo = xcalloc(1, sizeof(*cinfo));
1365 if (gethostname(thishost, sizeof(thishost)) == -1)
1366 fatal("gethostname: %s", strerror(errno));
1367 cinfo->thishost = xstrdup(thishost);
1368 thishost[strcspn(thishost, ".")] = '\0';
1369 cinfo->shorthost = xstrdup(thishost);
1370 xasprintf(&cinfo->portstr, "%d", options.port);
1371 xasprintf(&cinfo->uidstr, "%llu",
1372 (unsigned long long)pw->pw_uid);
1373 cinfo->keyalias = xstrdup(options.host_key_alias ?
1374 options.host_key_alias : host_arg);
1375 cinfo->conn_hash_hex = ssh_connection_hash(cinfo->thishost, host,
1376 cinfo->portstr, options.user);
1377 cinfo->host_arg = xstrdup(host_arg);
1378 cinfo->remhost = xstrdup(host);
1379 cinfo->remuser = xstrdup(options.user);
1380 cinfo->homedir = xstrdup(pw->pw_dir);
1381 cinfo->locuser = xstrdup(pw->pw_name);
1383 /* Find canonic host name. */
1384 if (strchr(host, '.') == 0) {
1385 struct addrinfo hints;
1386 struct addrinfo *ai = NULL;
1388 memset(&hints, 0, sizeof(hints));
1389 hints.ai_family = options.address_family;
1390 hints.ai_flags = AI_CANONNAME;
1391 hints.ai_socktype = SOCK_STREAM;
1392 errgai = getaddrinfo(host, NULL, &hints, &ai);
1394 if (ai->ai_canonname != NULL)
1395 host = xstrdup(ai->ai_canonname);
1401 * Expand tokens in arguments. NB. LocalCommand is expanded later,
1402 * after port-forwarding is set up, so it may pick up any local
1403 * tunnel interface name allocated.
1405 if (options.remote_command != NULL) {
1406 debug3("expanding RemoteCommand: %s", options.remote_command);
1407 cp = options.remote_command;
1408 options.remote_command = default_client_percent_expand(cp,
1410 debug3("expanded RemoteCommand: %s", options.remote_command);
1412 if ((r = sshbuf_put(command, options.remote_command,
1413 strlen(options.remote_command))) != 0)
1414 fatal_fr(r, "buffer error");
1417 if (options.control_path != NULL) {
1418 cp = tilde_expand_filename(options.control_path, getuid());
1419 free(options.control_path);
1420 options.control_path = default_client_percent_dollar_expand(cp,
1425 if (options.identity_agent != NULL) {
1426 p = tilde_expand_filename(options.identity_agent, getuid());
1427 cp = default_client_percent_dollar_expand(p, cinfo);
1429 free(options.identity_agent);
1430 options.identity_agent = cp;
1433 if (options.forward_agent_sock_path != NULL) {
1434 p = tilde_expand_filename(options.forward_agent_sock_path,
1436 cp = default_client_percent_dollar_expand(p, cinfo);
1438 free(options.forward_agent_sock_path);
1439 options.forward_agent_sock_path = cp;
1440 if (stat(options.forward_agent_sock_path, &st) != 0) {
1441 error("Cannot forward agent socket path \"%s\": %s",
1442 options.forward_agent_sock_path, strerror(errno));
1443 if (options.exit_on_forward_failure)
1448 if (options.num_system_hostfiles > 0 &&
1449 strcasecmp(options.system_hostfiles[0], "none") == 0) {
1450 if (options.num_system_hostfiles > 1)
1451 fatal("Invalid GlobalKnownHostsFiles: \"none\" "
1452 "appears with other entries");
1453 free(options.system_hostfiles[0]);
1454 options.system_hostfiles[0] = NULL;
1455 options.num_system_hostfiles = 0;
1458 if (options.num_user_hostfiles > 0 &&
1459 strcasecmp(options.user_hostfiles[0], "none") == 0) {
1460 if (options.num_user_hostfiles > 1)
1461 fatal("Invalid UserKnownHostsFiles: \"none\" "
1462 "appears with other entries");
1463 free(options.user_hostfiles[0]);
1464 options.user_hostfiles[0] = NULL;
1465 options.num_user_hostfiles = 0;
1467 for (j = 0; j < options.num_user_hostfiles; j++) {
1468 if (options.user_hostfiles[j] == NULL)
1470 cp = tilde_expand_filename(options.user_hostfiles[j], getuid());
1471 p = default_client_percent_dollar_expand(cp, cinfo);
1472 if (strcmp(options.user_hostfiles[j], p) != 0)
1473 debug3("expanded UserKnownHostsFile '%s' -> "
1474 "'%s'", options.user_hostfiles[j], p);
1475 free(options.user_hostfiles[j]);
1477 options.user_hostfiles[j] = p;
1480 for (i = 0; i < options.num_local_forwards; i++) {
1481 if (options.local_forwards[i].listen_path != NULL) {
1482 cp = options.local_forwards[i].listen_path;
1483 p = options.local_forwards[i].listen_path =
1484 default_client_percent_expand(cp, cinfo);
1485 if (strcmp(cp, p) != 0)
1486 debug3("expanded LocalForward listen path "
1487 "'%s' -> '%s'", cp, p);
1490 if (options.local_forwards[i].connect_path != NULL) {
1491 cp = options.local_forwards[i].connect_path;
1492 p = options.local_forwards[i].connect_path =
1493 default_client_percent_expand(cp, cinfo);
1494 if (strcmp(cp, p) != 0)
1495 debug3("expanded LocalForward connect path "
1496 "'%s' -> '%s'", cp, p);
1501 for (i = 0; i < options.num_remote_forwards; i++) {
1502 if (options.remote_forwards[i].listen_path != NULL) {
1503 cp = options.remote_forwards[i].listen_path;
1504 p = options.remote_forwards[i].listen_path =
1505 default_client_percent_expand(cp, cinfo);
1506 if (strcmp(cp, p) != 0)
1507 debug3("expanded RemoteForward listen path "
1508 "'%s' -> '%s'", cp, p);
1511 if (options.remote_forwards[i].connect_path != NULL) {
1512 cp = options.remote_forwards[i].connect_path;
1513 p = options.remote_forwards[i].connect_path =
1514 default_client_percent_expand(cp, cinfo);
1515 if (strcmp(cp, p) != 0)
1516 debug3("expanded RemoteForward connect path "
1517 "'%s' -> '%s'", cp, p);
1523 dump_client_config(&options, host);
1527 /* Expand SecurityKeyProvider if it refers to an environment variable */
1528 if (options.sk_provider != NULL && *options.sk_provider == '$' &&
1529 strlen(options.sk_provider) > 1) {
1530 if ((cp = getenv(options.sk_provider + 1)) == NULL) {
1531 debug("Authenticator provider %s did not resolve; "
1532 "disabling", options.sk_provider);
1533 free(options.sk_provider);
1534 options.sk_provider = NULL;
1536 debug2("resolved SecurityKeyProvider %s => %s",
1537 options.sk_provider, cp);
1538 free(options.sk_provider);
1539 options.sk_provider = xstrdup(cp);
1543 if (muxclient_command != 0 && options.control_path == NULL)
1544 fatal("No ControlPath specified for \"-O\" command");
1545 if (options.control_path != NULL) {
1547 if ((sock = muxclient(options.control_path)) >= 0) {
1548 ssh_packet_set_connection(ssh, sock, sock);
1549 ssh_packet_set_mux(ssh);
1555 * If hostname canonicalisation was not enabled, then we may not
1556 * have yet resolved the hostname. Do so now.
1558 if (addrs == NULL && options.proxy_command == NULL) {
1559 debug2("resolving \"%s\" port %d", host, options.port);
1560 if ((addrs = resolve_host(host, options.port, 1,
1561 cname, sizeof(cname))) == NULL)
1562 cleanup_exit(255); /* resolve_host logs the error */
1565 if (options.connection_timeout >= INT_MAX/1000)
1566 timeout_ms = INT_MAX;
1568 timeout_ms = options.connection_timeout * 1000;
1570 /* Open a connection to the remote host. */
1571 if (ssh_connect(ssh, host, host_arg, addrs, &hostaddr, options.port,
1572 options.connection_attempts,
1573 &timeout_ms, options.tcp_keep_alive) != 0)
1577 freeaddrinfo(addrs);
1579 ssh_packet_set_timeout(ssh, options.server_alive_interval,
1580 options.server_alive_count_max);
1583 debug3("timeout: %d ms remain after connect", timeout_ms);
1586 * If we successfully made the connection and we have hostbased auth
1587 * enabled, load the public keys so we can later use the ssh-keysign
1588 * helper to sign challenges.
1590 sensitive_data.nkeys = 0;
1591 sensitive_data.keys = NULL;
1592 if (options.hostbased_authentication) {
1593 sensitive_data.nkeys = 10;
1594 sensitive_data.keys = xcalloc(sensitive_data.nkeys,
1595 sizeof(struct sshkey));
1597 /* XXX check errors? */
1598 #define L_PUBKEY(p,o) do { \
1599 if ((o) >= sensitive_data.nkeys) \
1600 fatal_f("pubkey out of array bounds"); \
1601 check_load(sshkey_load_public(p, &(sensitive_data.keys[o]), NULL), \
1604 #define L_CERT(p,o) do { \
1605 if ((o) >= sensitive_data.nkeys) \
1606 fatal_f("cert out of array bounds"); \
1607 check_load(sshkey_load_cert(p, &(sensitive_data.keys[o])), p, "cert"); \
1610 if (options.hostbased_authentication == 1) {
1611 L_CERT(_PATH_HOST_ECDSA_KEY_FILE, 0);
1612 L_CERT(_PATH_HOST_ED25519_KEY_FILE, 1);
1613 L_CERT(_PATH_HOST_RSA_KEY_FILE, 2);
1614 L_CERT(_PATH_HOST_DSA_KEY_FILE, 3);
1615 L_PUBKEY(_PATH_HOST_ECDSA_KEY_FILE, 4);
1616 L_PUBKEY(_PATH_HOST_ED25519_KEY_FILE, 5);
1617 L_PUBKEY(_PATH_HOST_RSA_KEY_FILE, 6);
1618 L_PUBKEY(_PATH_HOST_DSA_KEY_FILE, 7);
1619 L_CERT(_PATH_HOST_XMSS_KEY_FILE, 8);
1620 L_PUBKEY(_PATH_HOST_XMSS_KEY_FILE, 9);
1624 /* load options.identity_files */
1625 load_public_identity_files(cinfo);
1627 /* optionally set the SSH_AUTHSOCKET_ENV_NAME variable */
1628 if (options.identity_agent &&
1629 strcmp(options.identity_agent, SSH_AUTHSOCKET_ENV_NAME) != 0) {
1630 if (strcmp(options.identity_agent, "none") == 0) {
1631 unsetenv(SSH_AUTHSOCKET_ENV_NAME);
1633 cp = options.identity_agent;
1634 /* legacy (limited) format */
1635 if (cp[0] == '$' && cp[1] != '{') {
1636 if (!valid_env_name(cp + 1)) {
1637 fatal("Invalid IdentityAgent "
1638 "environment variable name %s", cp);
1640 if ((p = getenv(cp + 1)) == NULL)
1641 unsetenv(SSH_AUTHSOCKET_ENV_NAME);
1643 setenv(SSH_AUTHSOCKET_ENV_NAME, p, 1);
1645 /* identity_agent specifies a path directly */
1646 setenv(SSH_AUTHSOCKET_ENV_NAME, cp, 1);
1651 if (options.forward_agent && options.forward_agent_sock_path != NULL) {
1652 cp = options.forward_agent_sock_path;
1654 if (!valid_env_name(cp + 1)) {
1655 fatal("Invalid ForwardAgent environment variable name %s", cp);
1657 if ((p = getenv(cp + 1)) != NULL)
1658 forward_agent_sock_path = xstrdup(p);
1660 options.forward_agent = 0;
1663 forward_agent_sock_path = cp;
1667 /* Expand ~ in known host file names. */
1668 tilde_expand_paths(options.system_hostfiles,
1669 options.num_system_hostfiles);
1670 tilde_expand_paths(options.user_hostfiles, options.num_user_hostfiles);
1672 ssh_signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
1673 ssh_signal(SIGCHLD, main_sigchld_handler);
1675 /* Log into the remote system. Never returns if the login fails. */
1676 ssh_login(ssh, &sensitive_data, host, (struct sockaddr *)&hostaddr,
1677 options.port, pw, timeout_ms, cinfo);
1679 /* We no longer need the private host keys. Clear them now. */
1680 if (sensitive_data.nkeys != 0) {
1681 for (i = 0; i < sensitive_data.nkeys; i++) {
1682 if (sensitive_data.keys[i] != NULL) {
1683 /* Destroys contents safely */
1684 debug3("clear hostkey %d", i);
1685 sshkey_free(sensitive_data.keys[i]);
1686 sensitive_data.keys[i] = NULL;
1689 free(sensitive_data.keys);
1691 for (i = 0; i < options.num_identity_files; i++) {
1692 free(options.identity_files[i]);
1693 options.identity_files[i] = NULL;
1694 if (options.identity_keys[i]) {
1695 sshkey_free(options.identity_keys[i]);
1696 options.identity_keys[i] = NULL;
1699 for (i = 0; i < options.num_certificate_files; i++) {
1700 free(options.certificate_files[i]);
1701 options.certificate_files[i] = NULL;
1704 #ifdef ENABLE_PKCS11
1705 (void)pkcs11_del_provider(options.pkcs11_provider);
1709 exit_status = ssh_session2(ssh, cinfo);
1710 ssh_conn_info_free(cinfo);
1711 ssh_packet_close(ssh);
1713 if (options.control_path != NULL && muxserver_sock != -1)
1714 unlink(options.control_path);
1716 /* Kill ProxyCommand if it is running. */
1717 ssh_kill_proxy_command();
1723 control_persist_detach(void)
1727 debug_f("backgrounding master process");
1730 * master (current process) into the background, and make the
1731 * foreground process a client of the backgrounded master.
1733 switch ((pid = fork())) {
1735 fatal_f("fork: %s", strerror(errno));
1737 /* Child: master process continues mainloop */
1740 /* Parent: set up mux client to connect to backgrounded master */
1741 debug2_f("background process is %ld", (long)pid);
1742 options.stdin_null = ostdin_null_flag;
1743 options.request_tty = orequest_tty;
1744 tty_flag = otty_flag;
1745 options.session_type = osession_type;
1746 close(muxserver_sock);
1747 muxserver_sock = -1;
1748 options.control_master = SSHCTL_MASTER_NO;
1749 muxclient(options.control_path);
1750 /* muxclient() doesn't return on success. */
1751 fatal("Failed to connect to new control master");
1753 if (stdfd_devnull(1, 1, !(log_is_on_stderr() && debug_flag)) == -1)
1754 error_f("stdfd_devnull failed");
1756 setproctitle("%s [mux]", options.control_path);
1759 /* Do fork() after authentication. Used by "ssh -f" */
1763 if (need_controlpersist_detach)
1764 control_persist_detach();
1765 debug("forking to background");
1766 options.fork_after_authentication = 0;
1767 if (daemon(1, 1) == -1)
1768 fatal("daemon() failed: %.200s", strerror(errno));
1769 if (stdfd_devnull(1, 1, !(log_is_on_stderr() && debug_flag)) == -1)
1770 error_f("stdfd_devnull failed");
1774 forwarding_success(void)
1776 if (forward_confirms_pending == -1)
1778 if (--forward_confirms_pending == 0) {
1779 debug_f("all expected forwarding replies received");
1780 if (options.fork_after_authentication)
1783 debug2_f("%d expected forwarding replies remaining",
1784 forward_confirms_pending);
1788 /* Callback for remote forward global requests */
1790 ssh_confirm_remote_forward(struct ssh *ssh, int type, u_int32_t seq, void *ctxt)
1792 struct Forward *rfwd = (struct Forward *)ctxt;
1796 /* XXX verbose() on failure? */
1797 debug("remote forward %s for: listen %s%s%d, connect %s:%d",
1798 type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
1799 rfwd->listen_path ? rfwd->listen_path :
1800 rfwd->listen_host ? rfwd->listen_host : "",
1801 (rfwd->listen_path || rfwd->listen_host) ? ":" : "",
1802 rfwd->listen_port, rfwd->connect_path ? rfwd->connect_path :
1803 rfwd->connect_host, rfwd->connect_port);
1804 if (rfwd->listen_path == NULL && rfwd->listen_port == 0) {
1805 if (type == SSH2_MSG_REQUEST_SUCCESS) {
1806 if ((r = sshpkt_get_u32(ssh, &port)) != 0)
1807 fatal_fr(r, "parse packet");
1809 error("Invalid allocated port %u for remote "
1810 "forward to %s:%d", port,
1811 rfwd->connect_host, rfwd->connect_port);
1812 /* Ensure failure processing runs below */
1813 type = SSH2_MSG_REQUEST_FAILURE;
1814 channel_update_permission(ssh,
1817 rfwd->allocated_port = (int)port;
1818 logit("Allocated port %u for remote "
1820 rfwd->allocated_port, rfwd->connect_host,
1821 rfwd->connect_port);
1822 channel_update_permission(ssh,
1823 rfwd->handle, rfwd->allocated_port);
1826 channel_update_permission(ssh, rfwd->handle, -1);
1830 if (type == SSH2_MSG_REQUEST_FAILURE) {
1831 if (options.exit_on_forward_failure) {
1832 if (rfwd->listen_path != NULL)
1833 fatal("Error: remote port forwarding failed "
1834 "for listen path %s", rfwd->listen_path);
1836 fatal("Error: remote port forwarding failed "
1837 "for listen port %d", rfwd->listen_port);
1839 if (rfwd->listen_path != NULL)
1840 logit("Warning: remote port forwarding failed "
1841 "for listen path %s", rfwd->listen_path);
1843 logit("Warning: remote port forwarding failed "
1844 "for listen port %d", rfwd->listen_port);
1847 forwarding_success();
1851 client_cleanup_stdio_fwd(struct ssh *ssh, int id, void *arg)
1853 debug("stdio forwarding: done");
1858 ssh_stdio_confirm(struct ssh *ssh, int id, int success, void *arg)
1861 fatal("stdio forwarding failed");
1865 ssh_tun_confirm(struct ssh *ssh, int id, int success, void *arg)
1868 error("Tunnel forwarding failed");
1869 if (options.exit_on_forward_failure)
1873 debug_f("tunnel forward established, id=%d", id);
1874 forwarding_success();
1878 ssh_init_stdio_forwarding(struct ssh *ssh)
1883 if (options.stdio_forward_host == NULL)
1886 debug3_f("%s:%d", options.stdio_forward_host,
1887 options.stdio_forward_port);
1889 if ((in = dup(STDIN_FILENO)) == -1 ||
1890 (out = dup(STDOUT_FILENO)) == -1)
1891 fatal_f("dup() in/out failed");
1892 if ((c = channel_connect_stdio_fwd(ssh, options.stdio_forward_host,
1893 options.stdio_forward_port, in, out,
1894 CHANNEL_NONBLOCK_STDIO)) == NULL)
1895 fatal_f("channel_connect_stdio_fwd failed");
1896 channel_register_cleanup(ssh, c->self, client_cleanup_stdio_fwd, 0);
1897 channel_register_open_confirm(ssh, c->self, ssh_stdio_confirm, NULL);
1901 ssh_init_forward_permissions(struct ssh *ssh, const char *what, char **opens,
1906 char *addr, *arg, *oarg, ch;
1907 int where = FORWARD_LOCAL;
1909 channel_clear_permission(ssh, FORWARD_ADM, where);
1911 return; /* permit any */
1913 /* handle keywords: "any" / "none" */
1914 if (num_opens == 1 && strcmp(opens[0], "any") == 0)
1916 if (num_opens == 1 && strcmp(opens[0], "none") == 0) {
1917 channel_disable_admin(ssh, where);
1920 /* Otherwise treat it as a list of permitted host:port */
1921 for (i = 0; i < num_opens; i++) {
1922 oarg = arg = xstrdup(opens[i]);
1924 addr = hpdelim2(&arg, &ch);
1925 if (addr == NULL || ch == '/')
1926 fatal_f("missing host in %s", what);
1927 addr = cleanhostname(addr);
1928 if (arg == NULL || ((port = permitopen_port(arg)) < 0))
1929 fatal_f("bad port number in %s", what);
1930 /* Send it to channels layer */
1931 channel_add_permission(ssh, FORWARD_ADM,
1938 ssh_init_forwarding(struct ssh *ssh, char **ifname)
1943 ssh_init_forward_permissions(ssh, "permitremoteopen",
1944 options.permitted_remote_opens,
1945 options.num_permitted_remote_opens);
1947 if (options.exit_on_forward_failure)
1948 forward_confirms_pending = 0; /* track pending requests */
1949 /* Initiate local TCP/IP port forwardings. */
1950 for (i = 0; i < options.num_local_forwards; i++) {
1951 debug("Local connections to %.200s:%d forwarded to remote "
1952 "address %.200s:%d",
1953 (options.local_forwards[i].listen_path != NULL) ?
1954 options.local_forwards[i].listen_path :
1955 (options.local_forwards[i].listen_host == NULL) ?
1956 (options.fwd_opts.gateway_ports ? "*" : "LOCALHOST") :
1957 options.local_forwards[i].listen_host,
1958 options.local_forwards[i].listen_port,
1959 (options.local_forwards[i].connect_path != NULL) ?
1960 options.local_forwards[i].connect_path :
1961 options.local_forwards[i].connect_host,
1962 options.local_forwards[i].connect_port);
1963 success += channel_setup_local_fwd_listener(ssh,
1964 &options.local_forwards[i], &options.fwd_opts);
1966 if (i > 0 && success != i && options.exit_on_forward_failure)
1967 fatal("Could not request local forwarding.");
1968 if (i > 0 && success == 0)
1969 error("Could not request local forwarding.");
1971 /* Initiate remote TCP/IP port forwardings. */
1972 for (i = 0; i < options.num_remote_forwards; i++) {
1973 debug("Remote connections from %.200s:%d forwarded to "
1974 "local address %.200s:%d",
1975 (options.remote_forwards[i].listen_path != NULL) ?
1976 options.remote_forwards[i].listen_path :
1977 (options.remote_forwards[i].listen_host == NULL) ?
1978 "LOCALHOST" : options.remote_forwards[i].listen_host,
1979 options.remote_forwards[i].listen_port,
1980 (options.remote_forwards[i].connect_path != NULL) ?
1981 options.remote_forwards[i].connect_path :
1982 options.remote_forwards[i].connect_host,
1983 options.remote_forwards[i].connect_port);
1984 if ((options.remote_forwards[i].handle =
1985 channel_request_remote_forwarding(ssh,
1986 &options.remote_forwards[i])) >= 0) {
1987 client_register_global_confirm(
1988 ssh_confirm_remote_forward,
1989 &options.remote_forwards[i]);
1990 forward_confirms_pending++;
1991 } else if (options.exit_on_forward_failure)
1992 fatal("Could not request remote forwarding.");
1994 logit("Warning: Could not request remote forwarding.");
1997 /* Initiate tunnel forwarding. */
1998 if (options.tun_open != SSH_TUNMODE_NO) {
1999 if ((*ifname = client_request_tun_fwd(ssh,
2000 options.tun_open, options.tun_local,
2001 options.tun_remote, ssh_tun_confirm, NULL)) != NULL)
2002 forward_confirms_pending++;
2003 else if (options.exit_on_forward_failure)
2004 fatal("Could not request tunnel forwarding.");
2006 error("Could not request tunnel forwarding.");
2008 if (forward_confirms_pending > 0) {
2009 debug_f("expecting replies for %d forwards",
2010 forward_confirms_pending);
2015 check_agent_present(void)
2019 if (options.forward_agent) {
2020 /* Clear agent forwarding if we don't have an agent. */
2021 if ((r = ssh_get_authentication_socket(NULL)) != 0) {
2022 options.forward_agent = 0;
2023 if (r != SSH_ERR_AGENT_NOT_PRESENT)
2024 debug_r(r, "ssh_get_authentication_socket");
2030 ssh_session2_setup(struct ssh *ssh, int id, int success, void *arg)
2032 extern char **environ;
2033 const char *display, *term;
2034 int r, interactive = tty_flag;
2035 char *proto = NULL, *data = NULL;
2038 return; /* No need for error message, channels code sens one */
2040 display = getenv("DISPLAY");
2041 if (display == NULL && options.forward_x11)
2042 debug("X11 forwarding requested but DISPLAY not set");
2043 if (options.forward_x11 && client_x11_get_proto(ssh, display,
2044 options.xauth_location, options.forward_x11_trusted,
2045 options.forward_x11_timeout, &proto, &data) == 0) {
2046 /* Request forwarding with authentication spoofing. */
2047 debug("Requesting X11 forwarding with authentication "
2049 x11_request_forwarding_with_spoofing(ssh, id, display, proto,
2051 client_expect_confirm(ssh, id, "X11 forwarding", CONFIRM_WARN);
2052 /* XXX exit_on_forward_failure */
2056 check_agent_present();
2057 if (options.forward_agent) {
2058 debug("Requesting authentication agent forwarding.");
2059 channel_request_start(ssh, id, "auth-agent-req@openssh.com", 0);
2060 if ((r = sshpkt_send(ssh)) != 0)
2061 fatal_fr(r, "send packet");
2064 /* Tell the packet module whether this is an interactive session. */
2065 ssh_packet_set_interactive(ssh, interactive,
2066 options.ip_qos_interactive, options.ip_qos_bulk);
2068 if ((term = lookup_env_in_list("TERM", options.setenv,
2069 options.num_setenv)) == NULL || *term == '\0')
2070 term = getenv("TERM");
2071 client_session2_setup(ssh, id, tty_flag,
2072 options.session_type == SESSION_TYPE_SUBSYSTEM, term,
2073 NULL, fileno(stdin), command, environ);
2076 /* open new channel for a session */
2078 ssh_session2_open(struct ssh *ssh)
2081 int window, packetmax, in, out, err;
2083 if (options.stdin_null) {
2084 in = open(_PATH_DEVNULL, O_RDONLY);
2086 in = dup(STDIN_FILENO);
2088 out = dup(STDOUT_FILENO);
2089 err = dup(STDERR_FILENO);
2091 if (in == -1 || out == -1 || err == -1)
2092 fatal("dup() in/out/err failed");
2094 window = CHAN_SES_WINDOW_DEFAULT;
2095 packetmax = CHAN_SES_PACKET_DEFAULT;
2100 c = channel_new(ssh,
2101 "session", SSH_CHANNEL_OPENING, in, out, err,
2102 window, packetmax, CHAN_EXTENDED_WRITE,
2103 "client-session", CHANNEL_NONBLOCK_STDIO);
2105 debug3_f("channel_new: %d", c->self);
2107 channel_send_open(ssh, c->self);
2108 if (options.session_type != SESSION_TYPE_NONE)
2109 channel_register_open_confirm(ssh, c->self,
2110 ssh_session2_setup, NULL);
2116 ssh_session2(struct ssh *ssh, const struct ssh_conn_info *cinfo)
2119 char *cp, *tun_fwd_ifname = NULL;
2121 /* XXX should be pre-session */
2122 if (!options.control_persist)
2123 ssh_init_stdio_forwarding(ssh);
2125 ssh_init_forwarding(ssh, &tun_fwd_ifname);
2127 if (options.local_command != NULL) {
2128 debug3("expanding LocalCommand: %s", options.local_command);
2129 cp = options.local_command;
2130 options.local_command = percent_expand(cp,
2131 DEFAULT_CLIENT_PERCENT_EXPAND_ARGS(cinfo),
2132 "T", tun_fwd_ifname == NULL ? "NONE" : tun_fwd_ifname,
2134 debug3("expanded LocalCommand: %s", options.local_command);
2138 /* Start listening for multiplex clients */
2139 if (!ssh_packet_get_mux(ssh))
2140 muxserver_listen(ssh);
2143 * If we are in control persist mode and have a working mux listen
2144 * socket, then prepare to background ourselves and have a foreground
2145 * client attach as a control client.
2146 * NB. we must save copies of the flags that we override for
2147 * the backgrounding, since we defer attachment of the client until
2148 * after the connection is fully established (in particular,
2149 * async rfwd replies have been received for ExitOnForwardFailure).
2151 if (options.control_persist && muxserver_sock != -1) {
2152 ostdin_null_flag = options.stdin_null;
2153 osession_type = options.session_type;
2154 orequest_tty = options.request_tty;
2155 otty_flag = tty_flag;
2156 options.stdin_null = 1;
2157 options.session_type = SESSION_TYPE_NONE;
2159 if (!options.fork_after_authentication &&
2160 (osession_type != SESSION_TYPE_NONE ||
2161 options.stdio_forward_host != NULL))
2162 need_controlpersist_detach = 1;
2163 options.fork_after_authentication = 1;
2166 * ControlPersist mux listen socket setup failed, attempt the
2167 * stdio forward setup that we skipped earlier.
2169 if (options.control_persist && muxserver_sock == -1)
2170 ssh_init_stdio_forwarding(ssh);
2172 if (options.session_type != SESSION_TYPE_NONE)
2173 id = ssh_session2_open(ssh);
2175 ssh_packet_set_interactive(ssh,
2176 options.control_master == SSHCTL_MASTER_NO,
2177 options.ip_qos_interactive, options.ip_qos_bulk);
2180 /* If we don't expect to open a new session, then disallow it */
2181 if (options.control_master == SSHCTL_MASTER_NO &&
2182 (ssh->compat & SSH_NEW_OPENSSH)) {
2183 debug("Requesting no-more-sessions@openssh.com");
2184 if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST)) != 0 ||
2185 (r = sshpkt_put_cstring(ssh,
2186 "no-more-sessions@openssh.com")) != 0 ||
2187 (r = sshpkt_put_u8(ssh, 0)) != 0 ||
2188 (r = sshpkt_send(ssh)) != 0)
2189 fatal_fr(r, "send packet");
2192 /* Execute a local command */
2193 if (options.local_command != NULL &&
2194 options.permit_local_command)
2195 ssh_local_cmd(options.local_command);
2198 * stdout is now owned by the session channel; clobber it here
2199 * so future channel closes are propagated to the local fd.
2200 * NB. this can only happen after LocalCommand has completed,
2201 * as it may want to write to stdout.
2203 if (!need_controlpersist_detach && stdfd_devnull(0, 1, 0) == -1)
2204 error_f("stdfd_devnull failed");
2207 * If requested and we are not interested in replies to remote
2208 * forwarding requests, then let ssh continue in the background.
2210 if (options.fork_after_authentication) {
2211 if (options.exit_on_forward_failure &&
2212 options.num_remote_forwards > 0) {
2213 debug("deferring postauth fork until remote forward "
2214 "confirmation received");
2219 return client_loop(ssh, tty_flag, tty_flag ?
2220 options.escape_char : SSH_ESCAPECHAR_NONE, id);
2223 /* Loads all IdentityFile and CertificateFile keys */
2225 load_public_identity_files(const struct ssh_conn_info *cinfo)
2227 char *filename, *cp;
2228 struct sshkey *public;
2230 u_int n_ids, n_certs;
2231 char *identity_files[SSH_MAX_IDENTITY_FILES];
2232 struct sshkey *identity_keys[SSH_MAX_IDENTITY_FILES];
2233 int identity_file_userprovided[SSH_MAX_IDENTITY_FILES];
2234 char *certificate_files[SSH_MAX_CERTIFICATE_FILES];
2235 struct sshkey *certificates[SSH_MAX_CERTIFICATE_FILES];
2236 int certificate_file_userprovided[SSH_MAX_CERTIFICATE_FILES];
2237 #ifdef ENABLE_PKCS11
2238 struct sshkey **keys = NULL;
2239 char **comments = NULL;
2243 n_ids = n_certs = 0;
2244 memset(identity_files, 0, sizeof(identity_files));
2245 memset(identity_keys, 0, sizeof(identity_keys));
2246 memset(identity_file_userprovided, 0,
2247 sizeof(identity_file_userprovided));
2248 memset(certificate_files, 0, sizeof(certificate_files));
2249 memset(certificates, 0, sizeof(certificates));
2250 memset(certificate_file_userprovided, 0,
2251 sizeof(certificate_file_userprovided));
2253 #ifdef ENABLE_PKCS11
2254 if (options.pkcs11_provider != NULL &&
2255 options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
2256 (pkcs11_init(!options.batch_mode) == 0) &&
2257 (nkeys = pkcs11_add_provider(options.pkcs11_provider, NULL,
2258 &keys, &comments)) > 0) {
2259 for (i = 0; i < nkeys; i++) {
2260 if (n_ids >= SSH_MAX_IDENTITY_FILES) {
2261 sshkey_free(keys[i]);
2265 identity_keys[n_ids] = keys[i];
2266 identity_files[n_ids] = comments[i]; /* transferred */
2272 #endif /* ENABLE_PKCS11 */
2273 for (i = 0; i < options.num_identity_files; i++) {
2274 if (n_ids >= SSH_MAX_IDENTITY_FILES ||
2275 strcasecmp(options.identity_files[i], "none") == 0) {
2276 free(options.identity_files[i]);
2277 options.identity_files[i] = NULL;
2280 cp = tilde_expand_filename(options.identity_files[i], getuid());
2281 filename = default_client_percent_dollar_expand(cp, cinfo);
2283 check_load(sshkey_load_public(filename, &public, NULL),
2284 filename, "pubkey");
2285 debug("identity file %s type %d", filename,
2286 public ? public->type : -1);
2287 free(options.identity_files[i]);
2288 identity_files[n_ids] = filename;
2289 identity_keys[n_ids] = public;
2290 identity_file_userprovided[n_ids] =
2291 options.identity_file_userprovided[i];
2292 if (++n_ids >= SSH_MAX_IDENTITY_FILES)
2296 * If no certificates have been explicitly listed then try
2297 * to add the default certificate variant too.
2299 if (options.num_certificate_files != 0)
2301 xasprintf(&cp, "%s-cert", filename);
2302 check_load(sshkey_load_public(cp, &public, NULL),
2303 filename, "pubkey");
2304 debug("identity file %s type %d", cp,
2305 public ? public->type : -1);
2306 if (public == NULL) {
2310 if (!sshkey_is_cert(public)) {
2311 debug_f("key %s type %s is not a certificate",
2312 cp, sshkey_type(public));
2313 sshkey_free(public);
2317 /* NB. leave filename pointing to private key */
2318 identity_files[n_ids] = xstrdup(filename);
2319 identity_keys[n_ids] = public;
2320 identity_file_userprovided[n_ids] =
2321 options.identity_file_userprovided[i];
2325 if (options.num_certificate_files > SSH_MAX_CERTIFICATE_FILES)
2326 fatal_f("too many certificates");
2327 for (i = 0; i < options.num_certificate_files; i++) {
2328 cp = tilde_expand_filename(options.certificate_files[i],
2330 filename = default_client_percent_dollar_expand(cp, cinfo);
2333 check_load(sshkey_load_public(filename, &public, NULL),
2334 filename, "certificate");
2335 debug("certificate file %s type %d", filename,
2336 public ? public->type : -1);
2337 free(options.certificate_files[i]);
2338 options.certificate_files[i] = NULL;
2339 if (public == NULL) {
2343 if (!sshkey_is_cert(public)) {
2344 debug_f("key %s type %s is not a certificate",
2345 filename, sshkey_type(public));
2346 sshkey_free(public);
2350 certificate_files[n_certs] = filename;
2351 certificates[n_certs] = public;
2352 certificate_file_userprovided[n_certs] =
2353 options.certificate_file_userprovided[i];
2357 options.num_identity_files = n_ids;
2358 memcpy(options.identity_files, identity_files, sizeof(identity_files));
2359 memcpy(options.identity_keys, identity_keys, sizeof(identity_keys));
2360 memcpy(options.identity_file_userprovided,
2361 identity_file_userprovided, sizeof(identity_file_userprovided));
2363 options.num_certificate_files = n_certs;
2364 memcpy(options.certificate_files,
2365 certificate_files, sizeof(certificate_files));
2366 memcpy(options.certificates, certificates, sizeof(certificates));
2367 memcpy(options.certificate_file_userprovided,
2368 certificate_file_userprovided,
2369 sizeof(certificate_file_userprovided));
2373 main_sigchld_handler(int sig)
2375 int save_errno = errno;
2379 while ((pid = waitpid(-1, &status, WNOHANG)) > 0 ||
2380 (pid == -1 && errno == EINTR))