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 1.131 2001/07/27 14:50:45 millert 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"
73 #include <openssl/engine.h>
77 #ifdef HAVE___PROGNAME
78 extern char *__progname;
83 /* Flag indicating whether IPv4 or IPv6. This can be set on the command line.
84 Default value is AF_UNSPEC means both IPv4 and IPv6. */
86 int IPv4or6 = AF_INET;
88 int IPv4or6 = AF_UNSPEC;
91 /* Flag indicating whether debug mode is on. This can be set on the command line. */
94 /* Flag indicating whether a tty should be allocated */
97 int force_tty_flag = 0;
99 /* don't exec a shell */
100 int no_shell_flag = 0;
103 * Flag indicating that nothing should be read from stdin. This can be set
104 * on the command line.
106 int stdin_null_flag = 0;
109 * Flag indicating that ssh should fork after authentication. This is useful
110 * so that the pasphrase can be entered manually, and then ssh goes to the
113 int fork_after_authentication_flag = 0;
116 * General data structure for command line options and options configurable
117 * in configuration files. See readconf.h.
122 * Name of the host we are connecting to. This is the name given on the
123 * command line, or the HostName specified for the user-supplied name in a
124 * configuration file.
128 /* socket address the host resolves to */
129 struct sockaddr_storage hostaddr;
132 * Flag to indicate that we have received a window change signal which has
133 * not yet been processed. This will cause a message indicating the new
134 * window size to be sent to the server a little later. This is volatile
135 * because this is updated in a signal handler.
137 volatile int received_window_change_signal = 0;
139 /* Private host keys. */
145 /* Original real UID. */
146 uid_t original_real_uid;
148 /* command to be executed */
151 /* Should we execute a command or invoke a subsystem? */
152 int subsystem_flag = 0;
155 /* Smartcard reader id */
156 int sc_reader_num = -1;
159 /* Prints a help message to the user. This function never returns. */
164 fprintf(stderr, "Usage: %s [options] host [command]\n", __progname);
165 fprintf(stderr, "Options:\n");
166 fprintf(stderr, " -l user Log in using this user name.\n");
167 fprintf(stderr, " -n Redirect input from " _PATH_DEVNULL ".\n");
168 fprintf(stderr, " -A Enable authentication agent forwarding.\n");
169 fprintf(stderr, " -a Disable authentication agent forwarding (default).\n");
171 fprintf(stderr, " -k Disable Kerberos ticket and AFS token forwarding.\n");
173 fprintf(stderr, " -X Enable X11 connection forwarding.\n");
174 fprintf(stderr, " -x Disable X11 connection forwarding (default).\n");
175 fprintf(stderr, " -i file Identity for public key authentication "
176 "(default: ~/.ssh/identity)\n");
177 fprintf(stderr, " -t Tty; allocate a tty even if command is given.\n");
178 fprintf(stderr, " -T Do not allocate a tty.\n");
179 fprintf(stderr, " -v Verbose; display verbose debugging messages.\n");
180 fprintf(stderr, " Multiple -v increases verbosity.\n");
181 fprintf(stderr, " -V Display version number only.\n");
182 fprintf(stderr, " -P Don't allocate a privileged port.\n");
183 fprintf(stderr, " -q Quiet; don't display any warning messages.\n");
184 fprintf(stderr, " -f Fork into background after authentication.\n");
185 fprintf(stderr, " -e char Set escape character; ``none'' = disable (default: ~).\n");
187 fprintf(stderr, " -c cipher Select encryption algorithm\n");
188 fprintf(stderr, " -m macs Specify MAC algorithms for protocol version 2.\n");
189 fprintf(stderr, " -p port Connect to this port. Server must be on the same port.\n");
190 fprintf(stderr, " -L listen-port:host:port Forward local port to remote address\n");
191 fprintf(stderr, " -R listen-port:host:port Forward remote port to local address\n");
192 fprintf(stderr, " These cause %s to listen for connections on a port, and\n", __progname);
193 fprintf(stderr, " forward them to the other side by connecting to host:port.\n");
194 fprintf(stderr, " -C Enable compression.\n");
195 fprintf(stderr, " -N Do not execute a shell or command.\n");
196 fprintf(stderr, " -g Allow remote hosts to connect to forwarded ports.\n");
197 fprintf(stderr, " -1 Force protocol version 1.\n");
198 fprintf(stderr, " -2 Force protocol version 2.\n");
199 fprintf(stderr, " -4 Use IPv4 only.\n");
200 fprintf(stderr, " -6 Use IPv6 only.\n");
201 fprintf(stderr, " -o 'option' Process the option as if it was read from a configuration file.\n");
202 fprintf(stderr, " -s Invoke command (mandatory) as SSH2 subsystem.\n");
203 fprintf(stderr, " -b addr Local IP address.\n");
208 * Connects to the given host using rsh (or prints an error message and exits
209 * if rsh is not available). This function never returns.
212 rsh_connect(char *host, char *user, Buffer * command)
217 log("Using rsh. WARNING: Connection will not be encrypted.");
218 /* Build argument list for rsh. */
220 args[i++] = _PATH_RSH;
221 /* host may have to come after user on some systems */
227 if (buffer_len(command) > 0) {
228 buffer_append(command, "\0", 1);
229 args[i++] = buffer_ptr(command);
233 for (i = 0; args[i]; i++) {
235 fprintf(stderr, " ");
236 fprintf(stderr, "%s", args[i]);
238 fprintf(stderr, "\n");
240 execv(_PATH_RSH, args);
245 static int ssh_session(void);
246 static int ssh_session2(void);
247 static void load_public_identity_files(void);
250 * Main program for the ssh client.
253 main(int ac, char **av)
255 int i, opt, exit_status, cerr;
256 u_short fwd_port, fwd_host_port;
257 char *p, *cp, buf[256];
261 uid_t original_effective_uid;
267 __progname = get_progname(av[0]);
271 * Save the original real uid. It will be needed later (uid-swapping
272 * may clobber the real uid).
274 original_real_uid = getuid();
275 original_effective_uid = geteuid();
277 #ifdef HAVE_SETRLIMIT
278 /* If we are installed setuid root be careful to not drop core. */
279 if (original_real_uid != original_effective_uid) {
281 rlim.rlim_cur = rlim.rlim_max = 0;
282 if (setrlimit(RLIMIT_CORE, &rlim) < 0)
283 fatal("setrlimit failed: %.100s", strerror(errno));
287 pw = getpwuid(original_real_uid);
289 log("You don't exist, go away!");
292 /* Take a copy of the returned structure. */
296 * Use uid-swapping to give up root privileges for the duration of
297 * option processing. We will re-instantiate the rights when we are
298 * ready to create the privileged port, and will permanently drop
299 * them when the port has been created (actually, when the connection
300 * has been made, as we may need to create the port several times).
302 temporarily_use_uid(pw);
305 * Set our umask to something reasonable, as some files are created
306 * with the default umask. This will make them world-readable but
307 * writable only by the owner, which is ok for all files for which we
308 * don't set the modes explicitly.
312 /* Initialize option structure to indicate that no values have been set. */
313 initialize_options(&options);
315 /* Parse command-line arguments. */
319 while ((opt = getopt(ac, av,
320 "1246ab:c:e:fgi:kl:m:no:p:qstvxACD:I:L:NPR:TVX")) != -1) {
323 options.protocol = SSH_PROTO_1;
326 options.protocol = SSH_PROTO_2;
338 fork_after_authentication_flag = 1;
342 options.forward_x11 = 0;
345 options.forward_x11 = 1;
348 options.gateway_ports = 1;
351 options.use_privileged_port = 0;
354 options.forward_agent = 0;
357 options.forward_agent = 1;
361 options.kerberos_tgt_passing = 0;
362 options.afs_token_passing = 0;
366 if (stat(optarg, &st) < 0) {
367 fprintf(stderr, "Warning: Identity file %s "
368 "does not exist.\n", optarg);
371 if (options.num_identity_files >=
372 SSH_MAX_IDENTITY_FILES)
373 fatal("Too many identity files specified "
374 "(max %d)", SSH_MAX_IDENTITY_FILES);
375 options.identity_files[options.num_identity_files++] =
380 sc_reader_num = atoi(optarg);
382 fprintf(stderr, "no support for smartcards.\n");
391 if (0 == debug_flag) {
393 options.log_level = SYSLOG_LEVEL_DEBUG1;
394 } else if (options.log_level < SYSLOG_LEVEL_DEBUG3) {
398 fatal("Too high debugging level.");
402 "%s, SSH protocols %d.%d/%d.%d, OpenSSL 0x%8.8lx\n",
404 PROTOCOL_MAJOR_1, PROTOCOL_MINOR_1,
405 PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2,
411 options.log_level = SYSLOG_LEVEL_QUIET;
414 if (optarg[0] == '^' && optarg[2] == 0 &&
415 (u_char) optarg[1] >= 64 &&
416 (u_char) optarg[1] < 128)
417 options.escape_char = (u_char) optarg[1] & 31;
418 else if (strlen(optarg) == 1)
419 options.escape_char = (u_char) optarg[0];
420 else if (strcmp(optarg, "none") == 0)
421 options.escape_char = SSH_ESCAPECHAR_NONE;
423 fprintf(stderr, "Bad escape character '%s'.\n",
429 if (ciphers_valid(optarg)) {
431 options.ciphers = xstrdup(optarg);
432 options.cipher = SSH_CIPHER_ILLEGAL;
435 options.cipher = cipher_number(optarg);
436 if (options.cipher == -1) {
438 "Unknown cipher type '%s'\n",
442 if (options.cipher == SSH_CIPHER_3DES)
443 options.ciphers = "3des-cbc";
444 else if (options.cipher == SSH_CIPHER_BLOWFISH)
445 options.ciphers = "blowfish-cbc";
447 options.ciphers = (char *)-1;
451 if (mac_valid(optarg))
452 options.macs = xstrdup(optarg);
454 fprintf(stderr, "Unknown mac type '%s'\n",
460 options.port = a2port(optarg);
461 if (options.port == 0) {
462 fprintf(stderr, "Bad port '%s'\n", optarg);
467 options.user = optarg;
470 if (sscanf(optarg, "%hu/%255[^/]/%hu", &fwd_port, buf,
471 &fwd_host_port) != 3 &&
472 sscanf(optarg, "%hu:%255[^:]:%hu", &fwd_port, buf,
473 &fwd_host_port) != 3) {
475 "Bad forwarding specification '%s'.\n",
480 add_remote_forward(&options, fwd_port, buf,
484 if (sscanf(optarg, "%hu/%255[^/]/%hu", &fwd_port, buf,
485 &fwd_host_port) != 3 &&
486 sscanf(optarg, "%hu:%255[^:]:%hu", &fwd_port, buf,
487 &fwd_host_port) != 3) {
489 "Bad forwarding specification '%s'.\n",
494 add_local_forward(&options, fwd_port, buf,
499 fwd_port = a2port(optarg);
501 fprintf(stderr, "Bad dynamic port '%s'\n",
505 add_local_forward(&options, fwd_port, "socks4", 0);
509 options.compression = 1;
520 if (process_config_line(&options, host ? host : "",
521 optarg, "command-line", 0, &dummy) != 0)
528 options.bind_address = optarg;
538 if (ac > 0 && !host && **av != '-') {
539 if (strchr(*av, '@')) {
542 if (cp == NULL || cp == p)
557 /* Check that we got a host name. */
561 SSLeay_add_all_algorithms();
562 ERR_load_crypto_strings();
564 /* Initialize the command to execute on remote host. */
565 buffer_init(&command);
568 * Save the command to execute on the remote host in a buffer. There
569 * is no limit on the length of the command, except by the maximum
570 * packet size. Also sets the tty flag if there is no command.
573 /* No command specified - execute shell on a tty. */
575 if (subsystem_flag) {
577 "You must specify a subsystem to invoke.\n");
581 /* A command has been specified. Store it into the buffer. */
582 for (i = 0; i < ac; i++) {
584 buffer_append(&command, " ", 1);
585 buffer_append(&command, av[i], strlen(av[i]));
589 /* Cannot fork to background if no command. */
590 if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag)
591 fatal("Cannot fork into background without a command to execute.");
593 /* Allocate a tty by default if no command specified. */
594 if (buffer_len(&command) == 0)
600 /* Do not allocate a tty if stdin is not a tty. */
601 if (!isatty(fileno(stdin)) && !force_tty_flag) {
603 log("Pseudo-terminal will not be allocated because stdin is not a terminal.");
608 * Initialize "log" output. Since we are the client all output
609 * actually goes to stderr.
611 log_init(av[0], options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level,
612 SYSLOG_FACILITY_USER, 1);
614 /* Read per-user configuration file. */
615 snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, _PATH_SSH_USER_CONFFILE);
616 read_config_file(buf, host, &options);
618 /* Read systemwide configuration file. */
619 read_config_file(_PATH_HOST_CONFIG_FILE, host, &options);
621 /* Fill configuration defaults. */
622 fill_default_options(&options);
625 log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 1);
629 if (options.user == NULL)
630 options.user = xstrdup(pw->pw_name);
632 if (options.hostname != NULL)
633 host = options.hostname;
635 /* Disable rhosts authentication if not running as root. */
637 /* Ignore uid if running under Windows */
638 if (!options.use_privileged_port) {
640 if (original_effective_uid != 0 || !options.use_privileged_port) {
642 debug("Rhosts Authentication disabled, "
643 "originating port will not be trusted.");
644 options.rhosts_authentication = 0;
647 * If using rsh has been selected, exec it now (without trying
648 * anything else). Note that we must release privileges first.
650 if (options.use_rsh) {
652 * Restore our superuser privileges. This must be done
653 * before permanently setting the uid.
657 /* Switch to the original uid permanently. */
658 permanently_set_uid(pw);
661 rsh_connect(host, options.user, &command);
662 fatal("rsh_connect returned");
664 /* Restore our superuser privileges. */
667 /* Open a connection to the remote host. */
669 cerr = ssh_connect(host, &hostaddr, options.port,
670 options.connection_attempts,
671 original_effective_uid != 0 || !options.use_privileged_port,
672 pw, options.proxy_command);
675 * If we successfully made the connection, load the host private key
676 * in case we will need it later for combined rsa-rhosts
677 * authentication. This must be done before releasing extra
678 * privileges, because the file is only readable by root.
680 sensitive_data.nkeys = 0;
681 sensitive_data.keys = NULL;
682 if (!cerr && (options.rhosts_rsa_authentication ||
683 options.hostbased_authentication)) {
684 sensitive_data.nkeys = 3;
685 sensitive_data.keys = xmalloc(sensitive_data.nkeys*sizeof(Key));
686 sensitive_data.keys[0] = key_load_private_type(KEY_RSA1,
687 _PATH_HOST_KEY_FILE, "", NULL);
688 sensitive_data.keys[1] = key_load_private_type(KEY_DSA,
689 _PATH_HOST_DSA_KEY_FILE, "", NULL);
690 sensitive_data.keys[2] = key_load_private_type(KEY_RSA,
691 _PATH_HOST_RSA_KEY_FILE, "", NULL);
694 * Get rid of any extra privileges that we may have. We will no
695 * longer need them. Also, extra privileges could make it very hard
696 * to read identity files and other non-world-readable files from the
697 * user's home directory if it happens to be on a NFS volume where
698 * root is mapped to nobody.
702 * Note that some legacy systems need to postpone the following call
703 * to permanently_set_uid() until the private hostkey is destroyed
704 * with RSA_free(). Otherwise the calling user could ptrace() the
705 * process, read the private hostkey and impersonate the host.
706 * OpenBSD does not allow ptracing of setuid processes.
708 permanently_set_uid(pw);
711 * Now that we are back to our own permissions, create ~/.ssh
712 * directory if it doesn\'t already exist.
714 snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, _PATH_SSH_USER_DIR);
715 if (stat(buf, &st) < 0)
716 if (mkdir(buf, 0700) < 0)
717 error("Could not create directory '%.200s'.", buf);
719 /* Check if the connection failed, and try "rsh" if appropriate. */
721 if (!options.fallback_to_rsh)
723 if (options.port != 0)
724 log("Secure connection to %.100s on port %hu refused; "
725 "reverting to insecure method",
728 log("Secure connection to %.100s refused; "
729 "reverting to insecure method.", host);
731 rsh_connect(host, options.user, &command);
732 fatal("rsh_connect returned");
734 /* load options.identity_files */
735 load_public_identity_files();
737 /* Expand ~ in known host file names. */
739 options.system_hostfile =
740 tilde_expand_filename(options.system_hostfile, original_real_uid);
741 options.user_hostfile =
742 tilde_expand_filename(options.user_hostfile, original_real_uid);
743 options.system_hostfile2 =
744 tilde_expand_filename(options.system_hostfile2, original_real_uid);
745 options.user_hostfile2 =
746 tilde_expand_filename(options.user_hostfile2, original_real_uid);
748 /* Log into the remote system. This never returns if the login fails. */
749 ssh_login(sensitive_data.keys, sensitive_data.nkeys,
750 host, (struct sockaddr *)&hostaddr, pw);
752 /* We no longer need the private host keys. Clear them now. */
753 if (sensitive_data.nkeys != 0) {
754 for (i = 0; i < sensitive_data.nkeys; i++) {
755 if (sensitive_data.keys[i] != NULL) {
756 /* Destroys contents safely */
757 debug3("clear hostkey %d", i);
758 key_free(sensitive_data.keys[i]);
759 sensitive_data.keys[i] = NULL;
762 xfree(sensitive_data.keys);
765 exit_status = compat20 ? ssh_session2() : ssh_session();
771 x11_get_proto(char *proto, int proto_len, char *data, int data_len)
777 if (options.xauth_location) {
778 /* Try to get Xauthority information for the display. */
779 snprintf(line, sizeof line, "%.100s list %.200s 2>" _PATH_DEVNULL,
780 options.xauth_location, getenv("DISPLAY"));
781 f = popen(line, "r");
782 if (f && fgets(line, sizeof(line), f) &&
783 sscanf(line, "%*s %s %s", proto, data) == 2)
789 * If we didn't get authentication data, just make up some
790 * data. The forwarding code will check the validity of the
791 * response anyway, and substitute this data. The X11
792 * server, however, will ignore this fake data and use
793 * whatever authentication mechanisms it was using otherwise
794 * for the local connection.
799 strlcpy(proto, "MIT-MAGIC-COOKIE-1", proto_len);
800 for (i = 0; i < 16; i++) {
803 snprintf(data + 2 * i, data_len - 2 * i, "%02x", rand & 0xff);
810 ssh_init_forwarding(void)
815 /* Initiate local TCP/IP port forwardings. */
816 for (i = 0; i < options.num_local_forwards; i++) {
817 debug("Connections to local port %d forwarded to remote address %.200s:%d",
818 options.local_forwards[i].port,
819 options.local_forwards[i].host,
820 options.local_forwards[i].host_port);
821 success += channel_request_local_forwarding(
822 options.local_forwards[i].port,
823 options.local_forwards[i].host,
824 options.local_forwards[i].host_port,
825 options.gateway_ports);
827 if (i > 0 && success == 0)
828 error("Could not request local forwarding.");
830 /* Initiate remote TCP/IP port forwardings. */
831 for (i = 0; i < options.num_remote_forwards; i++) {
832 debug("Connections to remote port %d forwarded to local address %.200s:%d",
833 options.remote_forwards[i].port,
834 options.remote_forwards[i].host,
835 options.remote_forwards[i].host_port);
836 channel_request_remote_forwarding(
837 options.remote_forwards[i].port,
838 options.remote_forwards[i].host,
839 options.remote_forwards[i].host_port);
844 check_agent_present(void)
846 if (options.forward_agent) {
847 /* Clear agent forwarding if we don\'t have an agent. */
848 int authfd = ssh_get_authentication_socket();
850 options.forward_agent = 0;
852 ssh_close_authentication_socket(authfd);
866 /* Enable compression if requested. */
867 if (options.compression) {
868 debug("Requesting compression at level %d.", options.compression_level);
870 if (options.compression_level < 1 || options.compression_level > 9)
871 fatal("Compression level must be from 1 (fast) to 9 (slow, best).");
873 /* Send the request. */
874 packet_start(SSH_CMSG_REQUEST_COMPRESSION);
875 packet_put_int(options.compression_level);
878 type = packet_read(&plen);
879 if (type == SSH_SMSG_SUCCESS)
880 packet_start_compression(options.compression_level);
881 else if (type == SSH_SMSG_FAILURE)
882 log("Warning: Remote host refused compression.");
884 packet_disconnect("Protocol error waiting for compression response.");
886 /* Allocate a pseudo tty if appropriate. */
888 debug("Requesting pty.");
890 /* Start the packet. */
891 packet_start(SSH_CMSG_REQUEST_PTY);
893 /* Store TERM in the packet. There is no limit on the
894 length of the string. */
898 packet_put_cstring(cp);
900 /* Store window size in the packet. */
901 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
902 memset(&ws, 0, sizeof(ws));
903 packet_put_int(ws.ws_row);
904 packet_put_int(ws.ws_col);
905 packet_put_int(ws.ws_xpixel);
906 packet_put_int(ws.ws_ypixel);
908 /* Store tty modes in the packet. */
909 tty_make_modes(fileno(stdin), NULL);
911 /* Send the packet, and wait for it to leave. */
915 /* Read response from the server. */
916 type = packet_read(&plen);
917 if (type == SSH_SMSG_SUCCESS) {
920 } else if (type == SSH_SMSG_FAILURE)
921 log("Warning: Remote host failed or refused to allocate a pseudo tty.");
923 packet_disconnect("Protocol error waiting for pty request response.");
925 /* Request X11 forwarding if enabled and DISPLAY is set. */
926 if (options.forward_x11 && getenv("DISPLAY") != NULL) {
927 char proto[512], data[512];
928 /* Get reasonable local authentication information. */
929 x11_get_proto(proto, sizeof proto, data, sizeof data);
930 /* Request forwarding with authentication spoofing. */
931 debug("Requesting X11 forwarding with authentication spoofing.");
932 x11_request_forwarding_with_spoofing(0, proto, data);
934 /* Read response from the server. */
935 type = packet_read(&plen);
936 if (type == SSH_SMSG_SUCCESS) {
938 } else if (type == SSH_SMSG_FAILURE) {
939 log("Warning: Remote host denied X11 forwarding.");
941 packet_disconnect("Protocol error waiting for X11 forwarding");
944 /* Tell the packet module whether this is an interactive session. */
945 packet_set_interactive(interactive);
947 /* Request authentication agent forwarding if appropriate. */
948 check_agent_present();
950 if (options.forward_agent) {
951 debug("Requesting authentication agent forwarding.");
952 auth_request_forwarding();
954 /* Read response from the server. */
955 type = packet_read(&plen);
956 packet_integrity_check(plen, 0, type);
957 if (type != SSH_SMSG_SUCCESS)
958 log("Warning: Remote host denied authentication agent forwarding.");
961 /* Initiate port forwardings. */
962 ssh_init_forwarding();
964 /* If requested, let ssh continue in the background. */
965 if (fork_after_authentication_flag)
966 if (daemon(1, 1) < 0)
967 fatal("daemon() failed: %.200s", strerror(errno));
970 * If a command was specified on the command line, execute the
971 * command now. Otherwise request the server to start a shell.
973 if (buffer_len(&command) > 0) {
974 int len = buffer_len(&command);
977 debug("Sending command: %.*s", len, buffer_ptr(&command));
978 packet_start(SSH_CMSG_EXEC_CMD);
979 packet_put_string(buffer_ptr(&command), buffer_len(&command));
983 debug("Requesting shell.");
984 packet_start(SSH_CMSG_EXEC_SHELL);
989 /* Enter the interactive session. */
990 return client_loop(have_tty, tty_flag ?
991 options.escape_char : SSH_ESCAPECHAR_NONE, 0);
995 client_subsystem_reply(int type, int plen, void *ctxt)
999 id = packet_get_int();
1000 len = buffer_len(&command);
1004 if (type == SSH2_MSG_CHANNEL_FAILURE)
1005 fatal("Request for subsystem '%.*s' failed on channel %d",
1006 len, buffer_ptr(&command), id);
1010 ssh_session2_callback(int id, void *arg)
1013 int interactive = 0;
1016 debug("client_init id %d arg %ld", id, (long)arg);
1021 cp = getenv("TERM");
1024 /* Store window size in the packet. */
1025 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
1026 memset(&ws, 0, sizeof(ws));
1028 channel_request_start(id, "pty-req", 0);
1029 packet_put_cstring(cp);
1030 packet_put_int(ws.ws_col);
1031 packet_put_int(ws.ws_row);
1032 packet_put_int(ws.ws_xpixel);
1033 packet_put_int(ws.ws_ypixel);
1034 tio = get_saved_tio();
1035 tty_make_modes(/*ignored*/ 0, &tio);
1038 /* XXX wait for reply */
1040 if (options.forward_x11 &&
1041 getenv("DISPLAY") != NULL) {
1042 char proto[512], data[512];
1043 /* Get reasonable local authentication information. */
1044 x11_get_proto(proto, sizeof proto, data, sizeof data);
1045 /* Request forwarding with authentication spoofing. */
1046 debug("Requesting X11 forwarding with authentication spoofing.");
1047 x11_request_forwarding_with_spoofing(id, proto, data);
1049 /* XXX wait for reply */
1052 check_agent_present();
1053 if (options.forward_agent) {
1054 debug("Requesting authentication agent forwarding.");
1055 channel_request_start(id, "auth-agent-req@openssh.com", 0);
1059 len = buffer_len(&command);
1063 if (subsystem_flag) {
1064 debug("Sending subsystem: %.*s", len, buffer_ptr(&command));
1065 channel_request_start(id, "subsystem", /*want reply*/ 1);
1066 /* register callback for reply */
1067 /* XXX we asume that client_loop has already been called */
1068 dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &client_subsystem_reply);
1069 dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &client_subsystem_reply);
1071 debug("Sending command: %.*s", len, buffer_ptr(&command));
1072 channel_request_start(id, "exec", 0);
1074 packet_put_string(buffer_ptr(&command), buffer_len(&command));
1077 channel_request(id, "shell", 0);
1079 /* channel_callback(id, SSH2_MSG_OPEN_CONFIGMATION, client_init, 0); */
1081 /* register different callback, etc. XXX */
1082 packet_set_interactive(interactive);
1086 ssh_session2_command(void)
1089 int window, packetmax, in, out, err;
1091 if (stdin_null_flag) {
1092 in = open(_PATH_DEVNULL, O_RDONLY);
1094 in = dup(STDIN_FILENO);
1096 out = dup(STDOUT_FILENO);
1097 err = dup(STDERR_FILENO);
1099 if (in < 0 || out < 0 || err < 0)
1100 fatal("dup() in/out/err failed");
1102 /* enable nonblocking unless tty */
1110 window = CHAN_SES_WINDOW_DEFAULT;
1111 packetmax = CHAN_SES_PACKET_DEFAULT;
1117 "session", SSH_CHANNEL_OPENING, in, out, err,
1118 window, packetmax, CHAN_EXTENDED_WRITE,
1119 xstrdup("client-session"), /*nonblock*/0);
1121 fatal("ssh_session2_command: channel_new failed");
1123 debug3("ssh_session2_command: channel_new: %d", c->self);
1125 channel_send_open(c->self);
1126 channel_register_callback(c->self, SSH2_MSG_CHANNEL_OPEN_CONFIRMATION,
1127 ssh_session2_callback, (void *)0);
1137 /* XXX should be pre-session */
1138 ssh_init_forwarding();
1140 id = no_shell_flag ? -1 : ssh_session2_command();
1142 /* If requested, let ssh continue in the background. */
1143 if (fork_after_authentication_flag)
1144 if (daemon(1, 1) < 0)
1145 fatal("daemon() failed: %.200s", strerror(errno));
1147 return client_loop(tty_flag, tty_flag ?
1148 options.escape_char : SSH_ESCAPECHAR_NONE, id);
1152 load_public_identity_files(void)
1159 if (sc_reader_num != -1 &&
1160 options.num_identity_files + 1 < SSH_MAX_IDENTITY_FILES &&
1161 (public = sc_get_key(sc_reader_num)) != NULL ) {
1164 if (options.num_identity_files + 2 > SSH_MAX_IDENTITY_FILES)
1165 options.num_identity_files = SSH_MAX_IDENTITY_FILES - 2;
1166 memmove(&options.identity_files[2], &options.identity_files[0],
1167 sizeof(char *) * options.num_identity_files);
1168 options.num_identity_files += 2;
1171 /* XXX ssh1 vs ssh2 */
1172 new = key_new(KEY_RSA);
1173 new->flags = KEY_FLAG_EXT;
1174 BN_copy(new->rsa->n, public->rsa->n);
1175 BN_copy(new->rsa->e, public->rsa->e);
1176 RSA_set_method(new->rsa, sc_get_engine());
1177 options.identity_keys[0] = new;
1178 options.identity_files[0] = xstrdup("smartcard rsa key");;
1180 new = key_new(KEY_RSA1);
1181 new->flags = KEY_FLAG_EXT;
1182 BN_copy(new->rsa->n, public->rsa->n);
1183 BN_copy(new->rsa->e, public->rsa->e);
1184 RSA_set_method(new->rsa, sc_get_engine());
1185 options.identity_keys[1] = new;
1186 options.identity_files[1] = xstrdup("smartcard rsa1 key");
1191 for (; i < options.num_identity_files; i++) {
1192 filename = tilde_expand_filename(options.identity_files[i],
1194 public = key_load_public(filename, NULL);
1195 debug("identity file %s type %d", filename,
1196 public ? public->type : -1);
1197 xfree(options.identity_files[i]);
1198 options.identity_files[i] = filename;
1199 options.identity_keys[i] = public;