2 * Author: Tatu Ylonen <ylo@cs.hut.fi>
3 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5 * Ssh client program. This program can be used to log into a remote machine.
6 * The software supports strong authentication, encryption, and forwarding
7 * of X11, TCP/IP, and authentication connections.
9 * As far as I am concerned, the code I have written for this software
10 * can be used freely for any purpose. Any derived versions of this
11 * software must be clearly marked as such, and if the derived work is
12 * incompatible with the protocol description in the RFC file, it must be
13 * called by a name other than "ssh" or "Secure Shell".
15 * Copyright (c) 1999 Niels Provos. All rights reserved.
17 * Modified to work with SSL by Niels Provos <provos@citi.umich.edu>
18 * in Canada (German citizen).
20 * Redistribution and use in source and binary forms, with or without
21 * modification, are permitted provided that the following conditions
23 * 1. Redistributions of source code must retain the above copyright
24 * notice, this list of conditions and the following disclaimer.
25 * 2. Redistributions in binary form must reproduce the above copyright
26 * notice, this list of conditions and the following disclaimer in the
27 * documentation and/or other materials provided with the distribution.
29 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
30 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
31 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
32 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
33 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
34 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
35 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
36 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
37 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
38 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
42 RCSID("$OpenBSD: ssh.c,v 1.117 2001/04/30 11:18:52 markus Exp $");
44 #include <openssl/evp.h>
45 #include <openssl/err.h>
60 #include "pathnames.h"
61 #include "clientloop.h"
64 #include "sshconnect.h"
65 #include "tildexpand.h"
72 #ifdef HAVE___PROGNAME
73 extern char *__progname;
78 /* Flag indicating whether IPv4 or IPv6. This can be set on the command line.
79 Default value is AF_UNSPEC means both IPv4 and IPv6. */
81 int IPv4or6 = AF_INET;
83 int IPv4or6 = AF_UNSPEC;
86 /* Flag indicating whether debug mode is on. This can be set on the command line. */
89 /* Flag indicating whether a tty should be allocated */
92 int force_tty_flag = 0;
94 /* don't exec a shell */
95 int no_shell_flag = 0;
98 * Flag indicating that nothing should be read from stdin. This can be set
99 * on the command line.
101 int stdin_null_flag = 0;
104 * Flag indicating that ssh should fork after authentication. This is useful
105 * so that the pasphrase can be entered manually, and then ssh goes to the
108 int fork_after_authentication_flag = 0;
111 * General data structure for command line options and options configurable
112 * in configuration files. See readconf.h.
117 * Name of the host we are connecting to. This is the name given on the
118 * command line, or the HostName specified for the user-supplied name in a
119 * configuration file.
123 /* socket address the host resolves to */
124 struct sockaddr_storage hostaddr;
127 * Flag to indicate that we have received a window change signal which has
128 * not yet been processed. This will cause a message indicating the new
129 * window size to be sent to the server a little later. This is volatile
130 * because this is updated in a signal handler.
132 volatile int received_window_change_signal = 0;
134 /* Private host keys. */
140 /* Original real UID. */
141 uid_t original_real_uid;
143 /* command to be executed */
146 /* Should we execute a command or invoke a subsystem? */
147 int subsystem_flag = 0;
149 /* Prints a help message to the user. This function never returns. */
154 fprintf(stderr, "Usage: %s [options] host [command]\n", __progname);
155 fprintf(stderr, "Options:\n");
156 fprintf(stderr, " -l user Log in using this user name.\n");
157 fprintf(stderr, " -n Redirect input from " _PATH_DEVNULL ".\n");
158 fprintf(stderr, " -A Enable authentication agent forwarding.\n");
159 fprintf(stderr, " -a Disable authentication agent forwarding.\n");
161 fprintf(stderr, " -k Disable Kerberos ticket and AFS token forwarding.\n");
163 fprintf(stderr, " -X Enable X11 connection forwarding.\n");
164 fprintf(stderr, " -x Disable X11 connection forwarding.\n");
165 fprintf(stderr, " -i file Identity for public key authentication "
166 "(default: ~/.ssh/identity)\n");
167 fprintf(stderr, " -t Tty; allocate a tty even if command is given.\n");
168 fprintf(stderr, " -T Do not allocate a tty.\n");
169 fprintf(stderr, " -v Verbose; display verbose debugging messages.\n");
170 fprintf(stderr, " Multiple -v increases verbosity.\n");
171 fprintf(stderr, " -V Display version number only.\n");
172 fprintf(stderr, " -P Don't allocate a privileged port.\n");
173 fprintf(stderr, " -q Quiet; don't display any warning messages.\n");
174 fprintf(stderr, " -f Fork into background after authentication.\n");
175 fprintf(stderr, " -e char Set escape character; ``none'' = disable (default: ~).\n");
177 fprintf(stderr, " -c cipher Select encryption algorithm: "
178 "``3des'', ``blowfish''\n");
179 fprintf(stderr, " -m macs Specify MAC algorithms for protocol version 2.\n");
180 fprintf(stderr, " -p port Connect to this port. Server must be on the same port.\n");
181 fprintf(stderr, " -L listen-port:host:port Forward local port to remote address\n");
182 fprintf(stderr, " -R listen-port:host:port Forward remote port to local address\n");
183 fprintf(stderr, " These cause %s to listen for connections on a port, and\n", __progname);
184 fprintf(stderr, " forward them to the other side by connecting to host:port.\n");
185 fprintf(stderr, " -C Enable compression.\n");
186 fprintf(stderr, " -N Do not execute a shell or command.\n");
187 fprintf(stderr, " -g Allow remote hosts to connect to forwarded ports.\n");
188 fprintf(stderr, " -1 Force protocol version 1.\n");
189 fprintf(stderr, " -2 Force protocol version 2.\n");
190 fprintf(stderr, " -4 Use IPv4 only.\n");
191 fprintf(stderr, " -6 Use IPv6 only.\n");
192 fprintf(stderr, " -o 'option' Process the option as if it was read from a configuration file.\n");
193 fprintf(stderr, " -s Invoke command (mandatory) as SSH2 subsystem.\n");
194 fprintf(stderr, " -b Local IP address.\n");
199 * Connects to the given host using rsh (or prints an error message and exits
200 * if rsh is not available). This function never returns.
203 rsh_connect(char *host, char *user, Buffer * command)
208 log("Using rsh. WARNING: Connection will not be encrypted.");
209 /* Build argument list for rsh. */
211 args[i++] = _PATH_RSH;
212 /* host may have to come after user on some systems */
218 if (buffer_len(command) > 0) {
219 buffer_append(command, "\0", 1);
220 args[i++] = buffer_ptr(command);
224 for (i = 0; args[i]; i++) {
226 fprintf(stderr, " ");
227 fprintf(stderr, "%s", args[i]);
229 fprintf(stderr, "\n");
231 execv(_PATH_RSH, args);
236 int ssh_session(void);
237 int ssh_session2(void);
238 void load_public_identity_files(void);
241 * Main program for the ssh client.
244 main(int ac, char **av)
246 int i, opt, optind, exit_status, ok;
247 u_short fwd_port, fwd_host_port;
248 char *optarg, *cp, buf[256];
252 uid_t original_effective_uid;
254 __progname = get_progname(av[0]);
258 * Save the original real uid. It will be needed later (uid-swapping
259 * may clobber the real uid).
261 original_real_uid = getuid();
262 original_effective_uid = geteuid();
264 #ifdef HAVE_SETRLIMIT
265 /* If we are installed setuid root be careful to not drop core. */
266 if (original_real_uid != original_effective_uid) {
268 rlim.rlim_cur = rlim.rlim_max = 0;
269 if (setrlimit(RLIMIT_CORE, &rlim) < 0)
270 fatal("setrlimit failed: %.100s", strerror(errno));
274 pw = getpwuid(original_real_uid);
276 log("You don't exist, go away!");
279 /* Take a copy of the returned structure. */
283 * Use uid-swapping to give up root privileges for the duration of
284 * option processing. We will re-instantiate the rights when we are
285 * ready to create the privileged port, and will permanently drop
286 * them when the port has been created (actually, when the connection
287 * has been made, as we may need to create the port several times).
289 temporarily_use_uid(pw);
292 * Set our umask to something reasonable, as some files are created
293 * with the default umask. This will make them world-readable but
294 * writable only by the owner, which is ok for all files for which we
295 * don't set the modes explicitly.
299 /* Initialize option structure to indicate that no values have been set. */
300 initialize_options(&options);
302 /* Parse command-line arguments. */
305 for (optind = 1; optind < ac; optind++) {
306 if (av[optind][0] != '-') {
309 if ((cp = strchr(av[optind], '@'))) {
312 options.user = av[optind];
322 if (strchr("eilcmpbLRDo", opt)) { /* options with arguments */
323 optarg = av[optind] + 2;
324 if (strcmp(optarg, "") == 0) {
325 if (optind >= ac - 1)
327 optarg = av[++optind];
336 options.protocol = SSH_PROTO_1;
339 options.protocol = SSH_PROTO_2;
351 fork_after_authentication_flag = 1;
355 options.forward_x11 = 0;
358 options.forward_x11 = 1;
361 options.gateway_ports = 1;
364 options.use_privileged_port = 0;
367 options.forward_agent = 0;
370 options.forward_agent = 1;
374 options.kerberos_tgt_passing = 0;
375 options.afs_token_passing = 0;
379 if (stat(optarg, &st) < 0) {
380 fprintf(stderr, "Warning: Identity file %s does not exist.\n",
384 if (options.num_identity_files >= SSH_MAX_IDENTITY_FILES)
385 fatal("Too many identity files specified (max %d)",
386 SSH_MAX_IDENTITY_FILES);
387 options.identity_files[options.num_identity_files++] = xstrdup(optarg);
395 if (0 == debug_flag) {
397 options.log_level = SYSLOG_LEVEL_DEBUG1;
398 } else if (options.log_level < SYSLOG_LEVEL_DEBUG3) {
402 fatal("Too high debugging level.");
407 "%s, SSH protocols %d.%d/%d.%d, OpenSSL 0x%8.8lx\n",
409 PROTOCOL_MAJOR_1, PROTOCOL_MINOR_1,
410 PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2,
416 options.log_level = SYSLOG_LEVEL_QUIET;
419 if (optarg[0] == '^' && optarg[2] == 0 &&
420 (u_char) optarg[1] >= 64 && (u_char) optarg[1] < 128)
421 options.escape_char = (u_char) optarg[1] & 31;
422 else if (strlen(optarg) == 1)
423 options.escape_char = (u_char) optarg[0];
424 else if (strcmp(optarg, "none") == 0)
425 options.escape_char = -2;
427 fprintf(stderr, "Bad escape character '%s'.\n", optarg);
432 if (ciphers_valid(optarg)) {
434 options.ciphers = xstrdup(optarg);
435 options.cipher = SSH_CIPHER_ILLEGAL;
438 options.cipher = cipher_number(optarg);
439 if (options.cipher == -1) {
440 fprintf(stderr, "Unknown cipher type '%s'\n", optarg);
443 if (options.cipher == SSH_CIPHER_3DES) {
444 options.ciphers = "3des-cbc";
445 } else if (options.cipher == SSH_CIPHER_BLOWFISH) {
446 options.ciphers = "blowfish-cbc";
448 options.ciphers = (char *)-1;
453 if (mac_valid(optarg))
454 options.macs = xstrdup(optarg);
456 fprintf(stderr, "Unknown mac type '%s'\n", optarg);
461 options.port = a2port(optarg);
462 if (options.port == 0) {
463 fprintf(stderr, "Bad port '%s'\n", optarg);
468 options.user = optarg;
471 if (sscanf(optarg, "%hu/%255[^/]/%hu", &fwd_port, buf,
472 &fwd_host_port) != 3 &&
473 sscanf(optarg, "%hu:%255[^:]:%hu", &fwd_port, buf,
474 &fwd_host_port) != 3) {
475 fprintf(stderr, "Bad forwarding specification '%s'.\n", optarg);
479 add_remote_forward(&options, fwd_port, buf, fwd_host_port);
482 if (sscanf(optarg, "%hu/%255[^/]/%hu", &fwd_port, buf,
483 &fwd_host_port) != 3 &&
484 sscanf(optarg, "%hu:%255[^:]:%hu", &fwd_port, buf,
485 &fwd_host_port) != 3) {
486 fprintf(stderr, "Bad forwarding specification '%s'.\n", optarg);
490 add_local_forward(&options, fwd_port, buf, fwd_host_port);
494 fwd_port = a2port(optarg);
496 fprintf(stderr, "Bad dynamic port '%s'\n", optarg);
499 add_local_forward(&options, fwd_port, "socks4", 0);
503 options.compression = 1;
514 if (process_config_line(&options, host ? host : "", optarg,
515 "command-line", 0, &dummy) != 0)
522 options.bind_address = optarg;
529 /* Check that we got a host name. */
533 SSLeay_add_all_algorithms();
534 ERR_load_crypto_strings();
536 /* Initialize the command to execute on remote host. */
537 buffer_init(&command);
540 * Save the command to execute on the remote host in a buffer. There
541 * is no limit on the length of the command, except by the maximum
542 * packet size. Also sets the tty flag if there is no command.
545 /* No command specified - execute shell on a tty. */
547 if (subsystem_flag) {
548 fprintf(stderr, "You must specify a subsystem to invoke.\n");
552 /* A command has been specified. Store it into the
554 for (i = optind; i < ac; i++) {
556 buffer_append(&command, " ", 1);
557 buffer_append(&command, av[i], strlen(av[i]));
561 /* Cannot fork to background if no command. */
562 if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag)
563 fatal("Cannot fork into background without a command to execute.");
565 /* Allocate a tty by default if no command specified. */
566 if (buffer_len(&command) == 0)
572 /* Do not allocate a tty if stdin is not a tty. */
573 if (!isatty(fileno(stdin)) && !force_tty_flag) {
575 log("Pseudo-terminal will not be allocated because stdin is not a terminal.");
580 * Initialize "log" output. Since we are the client all output
581 * actually goes to stderr.
583 log_init(av[0], options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level,
584 SYSLOG_FACILITY_USER, 1);
586 /* Read per-user configuration file. */
587 snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, _PATH_SSH_USER_CONFFILE);
588 read_config_file(buf, host, &options);
590 /* Read systemwide configuration file. */
591 read_config_file(_PATH_HOST_CONFIG_FILE, host, &options);
593 /* Fill configuration defaults. */
594 fill_default_options(&options);
597 log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 1);
601 if (options.user == NULL)
602 options.user = xstrdup(pw->pw_name);
604 if (options.hostname != NULL)
605 host = options.hostname;
607 /* Disable rhosts authentication if not running as root. */
609 /* Ignore uid if running under Windows */
610 if (!options.use_privileged_port) {
612 if (original_effective_uid != 0 || !options.use_privileged_port) {
614 debug("Rhosts Authentication disabled, "
615 "originating port will not be trusted.");
616 options.rhosts_authentication = 0;
620 * If using rsh has been selected, exec it now (without trying
621 * anything else). Note that we must release privileges first.
623 if (options.use_rsh) {
625 * Restore our superuser privileges. This must be done
626 * before permanently setting the uid.
630 /* Switch to the original uid permanently. */
631 permanently_set_uid(pw);
634 rsh_connect(host, options.user, &command);
635 fatal("rsh_connect returned");
637 /* Restore our superuser privileges. */
640 /* Open a connection to the remote host. */
642 ok = ssh_connect(host, &hostaddr, options.port,
643 options.connection_attempts,
644 original_effective_uid != 0 || !options.use_privileged_port,
645 pw, options.proxy_command);
648 * If we successfully made the connection, load the host private key
649 * in case we will need it later for combined rsa-rhosts
650 * authentication. This must be done before releasing extra
651 * privileges, because the file is only readable by root.
653 sensitive_data.nkeys = 0;
654 sensitive_data.keys = NULL;
655 if (ok && (options.rhosts_rsa_authentication ||
656 options.hostbased_authentication)) {
657 sensitive_data.nkeys = 3;
658 sensitive_data.keys = xmalloc(sensitive_data.nkeys*sizeof(Key));
659 sensitive_data.keys[0] = key_load_private_type(KEY_RSA1,
660 _PATH_HOST_KEY_FILE, "", NULL);
661 sensitive_data.keys[1] = key_load_private_type(KEY_DSA,
662 _PATH_HOST_DSA_KEY_FILE, "", NULL);
663 sensitive_data.keys[2] = key_load_private_type(KEY_RSA,
664 _PATH_HOST_RSA_KEY_FILE, "", NULL);
667 * Get rid of any extra privileges that we may have. We will no
668 * longer need them. Also, extra privileges could make it very hard
669 * to read identity files and other non-world-readable files from the
670 * user's home directory if it happens to be on a NFS volume where
671 * root is mapped to nobody.
675 * Note that some legacy systems need to postpone the following call
676 * to permanently_set_uid() until the private hostkey is destroyed
677 * with RSA_free(). Otherwise the calling user could ptrace() the
678 * process, read the private hostkey and impersonate the host.
679 * OpenBSD does not allow ptracing of setuid processes.
681 permanently_set_uid(pw);
684 * Now that we are back to our own permissions, create ~/.ssh
685 * directory if it doesn\'t already exist.
687 snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, _PATH_SSH_USER_DIR);
688 if (stat(buf, &st) < 0)
689 if (mkdir(buf, 0700) < 0)
690 error("Could not create directory '%.200s'.", buf);
692 /* Check if the connection failed, and try "rsh" if appropriate. */
694 if (options.port != 0)
695 log("Secure connection to %.100s on port %hu refused%.100s.",
697 options.fallback_to_rsh ? "; reverting to insecure method" : "");
699 log("Secure connection to %.100s refused%.100s.", host,
700 options.fallback_to_rsh ? "; reverting to insecure method" : "");
702 if (options.fallback_to_rsh) {
703 rsh_connect(host, options.user, &command);
704 fatal("rsh_connect returned");
708 /* load options.identity_files */
709 load_public_identity_files();
711 /* Expand ~ in known host file names. */
713 options.system_hostfile =
714 tilde_expand_filename(options.system_hostfile, original_real_uid);
715 options.user_hostfile =
716 tilde_expand_filename(options.user_hostfile, original_real_uid);
717 options.system_hostfile2 =
718 tilde_expand_filename(options.system_hostfile2, original_real_uid);
719 options.user_hostfile2 =
720 tilde_expand_filename(options.user_hostfile2, original_real_uid);
722 /* Log into the remote system. This never returns if the login fails. */
723 ssh_login(sensitive_data.keys, sensitive_data.nkeys,
724 host, (struct sockaddr *)&hostaddr, pw);
726 /* We no longer need the private host keys. Clear them now. */
727 if (sensitive_data.nkeys != 0) {
728 for (i = 0; i < sensitive_data.nkeys; i++) {
729 if (sensitive_data.keys[i] != NULL) {
730 /* Destroys contents safely */
731 debug3("clear hostkey %d", i);
732 key_free(sensitive_data.keys[i]);
733 sensitive_data.keys[i] = NULL;
736 xfree(sensitive_data.keys);
739 exit_status = compat20 ? ssh_session2() : ssh_session();
745 x11_get_proto(char *proto, int proto_len, char *data, int data_len)
751 if (options.xauth_location) {
752 /* Try to get Xauthority information for the display. */
753 snprintf(line, sizeof line, "%.100s list %.200s 2>" _PATH_DEVNULL,
754 options.xauth_location, getenv("DISPLAY"));
755 f = popen(line, "r");
756 if (f && fgets(line, sizeof(line), f) &&
757 sscanf(line, "%*s %s %s", proto, data) == 2)
763 * If we didn't get authentication data, just make up some
764 * data. The forwarding code will check the validity of the
765 * response anyway, and substitute this data. The X11
766 * server, however, will ignore this fake data and use
767 * whatever authentication mechanisms it was using otherwise
768 * for the local connection.
773 strlcpy(proto, "MIT-MAGIC-COOKIE-1", proto_len);
774 for (i = 0; i < 16; i++) {
777 snprintf(data + 2 * i, data_len - 2 * i, "%02x", rand & 0xff);
784 ssh_init_forwarding(void)
789 /* Initiate local TCP/IP port forwardings. */
790 for (i = 0; i < options.num_local_forwards; i++) {
791 debug("Connections to local port %d forwarded to remote address %.200s:%d",
792 options.local_forwards[i].port,
793 options.local_forwards[i].host,
794 options.local_forwards[i].host_port);
795 success += channel_request_local_forwarding(
796 options.local_forwards[i].port,
797 options.local_forwards[i].host,
798 options.local_forwards[i].host_port,
799 options.gateway_ports);
801 if (i > 0 && success == 0)
802 error("Could not request local forwarding.");
804 /* Initiate remote TCP/IP port forwardings. */
805 for (i = 0; i < options.num_remote_forwards; i++) {
806 debug("Connections to remote port %d forwarded to local address %.200s:%d",
807 options.remote_forwards[i].port,
808 options.remote_forwards[i].host,
809 options.remote_forwards[i].host_port);
810 channel_request_remote_forwarding(
811 options.remote_forwards[i].port,
812 options.remote_forwards[i].host,
813 options.remote_forwards[i].host_port);
818 check_agent_present(void)
820 if (options.forward_agent) {
821 /* Clear agent forwarding if we don\'t have an agent. */
822 int authfd = ssh_get_authentication_socket();
824 options.forward_agent = 0;
826 ssh_close_authentication_socket(authfd);
840 /* Enable compression if requested. */
841 if (options.compression) {
842 debug("Requesting compression at level %d.", options.compression_level);
844 if (options.compression_level < 1 || options.compression_level > 9)
845 fatal("Compression level must be from 1 (fast) to 9 (slow, best).");
847 /* Send the request. */
848 packet_start(SSH_CMSG_REQUEST_COMPRESSION);
849 packet_put_int(options.compression_level);
852 type = packet_read(&plen);
853 if (type == SSH_SMSG_SUCCESS)
854 packet_start_compression(options.compression_level);
855 else if (type == SSH_SMSG_FAILURE)
856 log("Warning: Remote host refused compression.");
858 packet_disconnect("Protocol error waiting for compression response.");
860 /* Allocate a pseudo tty if appropriate. */
862 debug("Requesting pty.");
864 /* Start the packet. */
865 packet_start(SSH_CMSG_REQUEST_PTY);
867 /* Store TERM in the packet. There is no limit on the
868 length of the string. */
872 packet_put_string(cp, strlen(cp));
874 /* Store window size in the packet. */
875 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
876 memset(&ws, 0, sizeof(ws));
877 packet_put_int(ws.ws_row);
878 packet_put_int(ws.ws_col);
879 packet_put_int(ws.ws_xpixel);
880 packet_put_int(ws.ws_ypixel);
882 /* Store tty modes in the packet. */
883 tty_make_modes(fileno(stdin), NULL);
885 /* Send the packet, and wait for it to leave. */
889 /* Read response from the server. */
890 type = packet_read(&plen);
891 if (type == SSH_SMSG_SUCCESS) {
894 } else if (type == SSH_SMSG_FAILURE)
895 log("Warning: Remote host failed or refused to allocate a pseudo tty.");
897 packet_disconnect("Protocol error waiting for pty request response.");
899 /* Request X11 forwarding if enabled and DISPLAY is set. */
900 if (options.forward_x11 && getenv("DISPLAY") != NULL) {
901 char proto[512], data[512];
902 /* Get reasonable local authentication information. */
903 x11_get_proto(proto, sizeof proto, data, sizeof data);
904 /* Request forwarding with authentication spoofing. */
905 debug("Requesting X11 forwarding with authentication spoofing.");
906 x11_request_forwarding_with_spoofing(0, proto, data);
908 /* Read response from the server. */
909 type = packet_read(&plen);
910 if (type == SSH_SMSG_SUCCESS) {
912 } else if (type == SSH_SMSG_FAILURE) {
913 log("Warning: Remote host denied X11 forwarding.");
915 packet_disconnect("Protocol error waiting for X11 forwarding");
918 /* Tell the packet module whether this is an interactive session. */
919 packet_set_interactive(interactive);
921 /* Request authentication agent forwarding if appropriate. */
922 check_agent_present();
924 if (options.forward_agent) {
925 debug("Requesting authentication agent forwarding.");
926 auth_request_forwarding();
928 /* Read response from the server. */
929 type = packet_read(&plen);
930 packet_integrity_check(plen, 0, type);
931 if (type != SSH_SMSG_SUCCESS)
932 log("Warning: Remote host denied authentication agent forwarding.");
935 /* Initiate port forwardings. */
936 ssh_init_forwarding();
938 /* If requested, let ssh continue in the background. */
939 if (fork_after_authentication_flag)
940 if (daemon(1, 1) < 0)
941 fatal("daemon() failed: %.200s", strerror(errno));
944 * If a command was specified on the command line, execute the
945 * command now. Otherwise request the server to start a shell.
947 if (buffer_len(&command) > 0) {
948 int len = buffer_len(&command);
951 debug("Sending command: %.*s", len, buffer_ptr(&command));
952 packet_start(SSH_CMSG_EXEC_CMD);
953 packet_put_string(buffer_ptr(&command), buffer_len(&command));
957 debug("Requesting shell.");
958 packet_start(SSH_CMSG_EXEC_SHELL);
963 /* Enter the interactive session. */
964 return client_loop(have_tty, tty_flag ? options.escape_char : -1, 0);
968 client_subsystem_reply(int type, int plen, void *ctxt)
972 id = packet_get_int();
973 len = buffer_len(&command);
977 if (type == SSH2_MSG_CHANNEL_FAILURE)
978 fatal("Request for subsystem '%.*s' failed on channel %d",
979 len, buffer_ptr(&command), id);
983 ssh_session2_callback(int id, void *arg)
989 debug("client_init id %d arg %ld", id, (long)arg);
997 /* Store window size in the packet. */
998 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
999 memset(&ws, 0, sizeof(ws));
1001 channel_request_start(id, "pty-req", 0);
1002 packet_put_cstring(cp);
1003 packet_put_int(ws.ws_col);
1004 packet_put_int(ws.ws_row);
1005 packet_put_int(ws.ws_xpixel);
1006 packet_put_int(ws.ws_ypixel);
1007 tio = get_saved_tio();
1008 tty_make_modes(/*ignored*/ 0, &tio);
1011 /* XXX wait for reply */
1013 if (options.forward_x11 &&
1014 getenv("DISPLAY") != NULL) {
1015 char proto[512], data[512];
1016 /* Get reasonable local authentication information. */
1017 x11_get_proto(proto, sizeof proto, data, sizeof data);
1018 /* Request forwarding with authentication spoofing. */
1019 debug("Requesting X11 forwarding with authentication spoofing.");
1020 x11_request_forwarding_with_spoofing(id, proto, data);
1022 /* XXX wait for reply */
1025 check_agent_present();
1026 if (options.forward_agent) {
1027 debug("Requesting authentication agent forwarding.");
1028 channel_request_start(id, "auth-agent-req@openssh.com", 0);
1032 len = buffer_len(&command);
1036 if (subsystem_flag) {
1037 debug("Sending subsystem: %.*s", len, buffer_ptr(&command));
1038 channel_request_start(id, "subsystem", /*want reply*/ 1);
1039 /* register callback for reply */
1040 /* XXX we asume that client_loop has already been called */
1041 dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &client_subsystem_reply);
1042 dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &client_subsystem_reply);
1044 debug("Sending command: %.*s", len, buffer_ptr(&command));
1045 channel_request_start(id, "exec", 0);
1047 packet_put_string(buffer_ptr(&command), buffer_len(&command));
1050 channel_request(id, "shell", 0);
1052 /* channel_callback(id, SSH2_MSG_OPEN_CONFIGMATION, client_init, 0); */
1054 /* register different callback, etc. XXX */
1055 packet_set_interactive(interactive);
1059 ssh_session2_command(void)
1061 int id, window, packetmax;
1064 if (stdin_null_flag) {
1065 in = open(_PATH_DEVNULL, O_RDONLY);
1067 in = dup(STDIN_FILENO);
1069 out = dup(STDOUT_FILENO);
1070 err = dup(STDERR_FILENO);
1072 if (in < 0 || out < 0 || err < 0)
1073 fatal("dup() in/out/err failed");
1075 /* enable nonblocking unless tty */
1083 window = CHAN_SES_WINDOW_DEFAULT;
1084 packetmax = CHAN_SES_PACKET_DEFAULT;
1090 "session", SSH_CHANNEL_OPENING, in, out, err,
1091 window, packetmax, CHAN_EXTENDED_WRITE,
1092 xstrdup("client-session"), /*nonblock*/0);
1094 debug("channel_new: %d", id);
1097 channel_register_callback(id, SSH2_MSG_CHANNEL_OPEN_CONFIRMATION,
1098 ssh_session2_callback, (void *)0);
1108 /* XXX should be pre-session */
1109 ssh_init_forwarding();
1111 id = no_shell_flag ? -1 : ssh_session2_command();
1113 /* If requested, let ssh continue in the background. */
1114 if (fork_after_authentication_flag)
1115 if (daemon(1, 1) < 0)
1116 fatal("daemon() failed: %.200s", strerror(errno));
1118 return client_loop(tty_flag, tty_flag ? options.escape_char : -1, id);
1122 load_public_identity_files(void)
1128 for (i = 0; i < options.num_identity_files; i++) {
1129 filename = tilde_expand_filename(options.identity_files[i],
1131 public = key_load_public(filename, NULL);
1132 debug("identity file %s type %d", filename,
1133 public ? public->type : -1);
1134 xfree(options.identity_files[i]);
1135 options.identity_files[i] = filename;
1136 options.identity_keys[i] = public;