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 1.145 2001/09/28 15:46:29 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"
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.
121 /* optional user configfile */
125 * Name of the host we are connecting to. This is the name given on the
126 * command line, or the HostName specified for the user-supplied name in a
127 * configuration file.
131 /* socket address the host resolves to */
132 struct sockaddr_storage hostaddr;
135 * Flag to indicate that we have received a window change signal which has
136 * not yet been processed. This will cause a message indicating the new
137 * window size to be sent to the server a little later. This is volatile
138 * because this is updated in a signal handler.
140 volatile int received_window_change_signal = 0;
142 /* Private host keys. */
148 /* Original real UID. */
149 uid_t original_real_uid;
151 /* command to be executed */
154 /* Should we execute a command or invoke a subsystem? */
155 int subsystem_flag = 0;
157 /* Prints a help message to the user. This function never returns. */
162 fprintf(stderr, "Usage: %s [options] host [command]\n", __progname);
163 fprintf(stderr, "Options:\n");
164 fprintf(stderr, " -l user Log in using this user name.\n");
165 fprintf(stderr, " -n Redirect input from " _PATH_DEVNULL ".\n");
166 fprintf(stderr, " -F config Config file (default: ~/%s).\n",
167 _PATH_SSH_USER_CONFFILE);
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");
178 fprintf(stderr, " -I reader Set smartcard reader.\n");
180 fprintf(stderr, " -t Tty; allocate a tty even if command is given.\n");
181 fprintf(stderr, " -T Do not allocate a tty.\n");
182 fprintf(stderr, " -v Verbose; display verbose debugging messages.\n");
183 fprintf(stderr, " Multiple -v increases verbosity.\n");
184 fprintf(stderr, " -V Display version number only.\n");
185 fprintf(stderr, " -P Don't allocate a privileged port.\n");
186 fprintf(stderr, " -q Quiet; don't display any warning messages.\n");
187 fprintf(stderr, " -f Fork into background after authentication.\n");
188 fprintf(stderr, " -e char Set escape character; ``none'' = disable (default: ~).\n");
190 fprintf(stderr, " -c cipher Select encryption algorithm\n");
191 fprintf(stderr, " -m macs Specify MAC algorithms for protocol version 2.\n");
192 fprintf(stderr, " -p port Connect to this port. Server must be on the same port.\n");
193 fprintf(stderr, " -L listen-port:host:port Forward local port to remote address\n");
194 fprintf(stderr, " -R listen-port:host:port Forward remote port to local address\n");
195 fprintf(stderr, " These cause %s to listen for connections on a port, and\n", __progname);
196 fprintf(stderr, " forward them to the other side by connecting to host:port.\n");
197 fprintf(stderr, " -D port Enable dynamic application-level port forwarding.\n");
198 fprintf(stderr, " -C Enable compression.\n");
199 fprintf(stderr, " -N Do not execute a shell or command.\n");
200 fprintf(stderr, " -g Allow remote hosts to connect to forwarded ports.\n");
201 fprintf(stderr, " -1 Force protocol version 1.\n");
202 fprintf(stderr, " -2 Force protocol version 2.\n");
203 fprintf(stderr, " -4 Use IPv4 only.\n");
204 fprintf(stderr, " -6 Use IPv6 only.\n");
205 fprintf(stderr, " -o 'option' Process the option as if it was read from a configuration file.\n");
206 fprintf(stderr, " -s Invoke command (mandatory) as SSH2 subsystem.\n");
207 fprintf(stderr, " -b addr Local IP address.\n");
212 * Connects to the given host using rsh (or prints an error message and exits
213 * if rsh is not available). This function never returns.
216 rsh_connect(char *host, char *user, Buffer * command)
221 log("Using rsh. WARNING: Connection will not be encrypted.");
222 /* Build argument list for rsh. */
224 args[i++] = _PATH_RSH;
225 /* host may have to come after user on some systems */
231 if (buffer_len(command) > 0) {
232 buffer_append(command, "\0", 1);
233 args[i++] = buffer_ptr(command);
237 for (i = 0; args[i]; i++) {
239 fprintf(stderr, " ");
240 fprintf(stderr, "%s", args[i]);
242 fprintf(stderr, "\n");
244 execv(_PATH_RSH, args);
249 static int ssh_session(void);
250 static int ssh_session2(void);
251 static void load_public_identity_files(void);
254 * Main program for the ssh client.
257 main(int ac, char **av)
259 int i, opt, exit_status, cerr;
260 u_short fwd_port, fwd_host_port;
261 char sfwd_port[6], sfwd_host_port[6];
262 char *p, *cp, buf[256];
266 uid_t original_effective_uid;
267 extern int optind, optreset;
270 __progname = get_progname(av[0]);
274 * Save the original real uid. It will be needed later (uid-swapping
275 * may clobber the real uid).
277 original_real_uid = getuid();
278 original_effective_uid = geteuid();
280 #ifdef HAVE_SETRLIMIT
281 /* If we are installed setuid root be careful to not drop core. */
282 if (original_real_uid != original_effective_uid) {
284 rlim.rlim_cur = rlim.rlim_max = 0;
285 if (setrlimit(RLIMIT_CORE, &rlim) < 0)
286 fatal("setrlimit failed: %.100s", strerror(errno));
290 pw = getpwuid(original_real_uid);
292 log("You don't exist, go away!");
295 /* Take a copy of the returned structure. */
299 * Use uid-swapping to give up root privileges for the duration of
300 * option processing. We will re-instantiate the rights when we are
301 * ready to create the privileged port, and will permanently drop
302 * them when the port has been created (actually, when the connection
303 * has been made, as we may need to create the port several times).
305 temporarily_use_uid(pw);
308 * Set our umask to something reasonable, as some files are created
309 * with the default umask. This will make them world-readable but
310 * writable only by the owner, which is ok for all files for which we
311 * don't set the modes explicitly.
315 /* Initialize option structure to indicate that no values have been set. */
316 initialize_options(&options);
318 /* Parse command-line arguments. */
322 while ((opt = getopt(ac, av,
323 "1246ab:c:e:fgi:kl:m:no:p:qstvxACD:F:I:L:NPR:TVX")) != -1) {
326 options.protocol = SSH_PROTO_1;
329 options.protocol = SSH_PROTO_2;
341 fork_after_authentication_flag = 1;
345 options.forward_x11 = 0;
348 options.forward_x11 = 1;
351 options.gateway_ports = 1;
354 options.use_privileged_port = 0;
357 options.forward_agent = 0;
360 options.forward_agent = 1;
364 options.kerberos_tgt_passing = 0;
365 options.afs_token_passing = 0;
369 if (stat(optarg, &st) < 0) {
370 fprintf(stderr, "Warning: Identity file %s "
371 "does not exist.\n", optarg);
374 if (options.num_identity_files >=
375 SSH_MAX_IDENTITY_FILES)
376 fatal("Too many identity files specified "
377 "(max %d)", SSH_MAX_IDENTITY_FILES);
378 options.identity_files[options.num_identity_files++] =
383 options.smartcard_device = xstrdup(optarg);
385 fprintf(stderr, "no support for smartcards.\n");
394 if (0 == debug_flag) {
396 options.log_level = SYSLOG_LEVEL_DEBUG1;
397 } else if (options.log_level < SYSLOG_LEVEL_DEBUG3) {
401 fatal("Too high debugging level.");
405 "%s, SSH protocols %d.%d/%d.%d, OpenSSL 0x%8.8lx\n",
407 PROTOCOL_MAJOR_1, PROTOCOL_MINOR_1,
408 PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2,
414 options.log_level = SYSLOG_LEVEL_QUIET;
417 if (optarg[0] == '^' && optarg[2] == 0 &&
418 (u_char) optarg[1] >= 64 &&
419 (u_char) optarg[1] < 128)
420 options.escape_char = (u_char) optarg[1] & 31;
421 else if (strlen(optarg) == 1)
422 options.escape_char = (u_char) optarg[0];
423 else if (strcmp(optarg, "none") == 0)
424 options.escape_char = SSH_ESCAPECHAR_NONE;
426 fprintf(stderr, "Bad escape character '%s'.\n",
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) {
441 "Unknown cipher type '%s'\n",
445 if (options.cipher == SSH_CIPHER_3DES)
446 options.ciphers = "3des-cbc";
447 else if (options.cipher == SSH_CIPHER_BLOWFISH)
448 options.ciphers = "blowfish-cbc";
450 options.ciphers = (char *)-1;
454 if (mac_valid(optarg))
455 options.macs = xstrdup(optarg);
457 fprintf(stderr, "Unknown mac type '%s'\n",
463 options.port = a2port(optarg);
464 if (options.port == 0) {
465 fprintf(stderr, "Bad port '%s'\n", optarg);
470 options.user = optarg;
475 if (sscanf(optarg, "%5[0-9]:%255[^:]:%5[0-9]",
476 sfwd_port, buf, sfwd_host_port) != 3 &&
477 sscanf(optarg, "%5[0-9]/%255[^/]/%5[0-9]",
478 sfwd_port, buf, sfwd_host_port) != 3) {
480 "Bad forwarding specification '%s'\n",
485 if ((fwd_port = a2port(sfwd_port)) == 0 ||
486 (fwd_host_port = a2port(sfwd_host_port)) == 0) {
488 "Bad forwarding port(s) '%s'\n", optarg);
492 add_local_forward(&options, fwd_port, buf,
495 add_remote_forward(&options, fwd_port, buf,
500 fwd_port = a2port(optarg);
502 fprintf(stderr, "Bad dynamic port '%s'\n",
506 add_local_forward(&options, fwd_port, "socks4", 0);
510 options.compression = 1;
521 if (process_config_line(&options, host ? host : "",
522 optarg, "command-line", 0, &dummy) != 0)
529 options.bind_address = optarg;
542 if (ac > 0 && !host && **av != '-') {
543 if (strchr(*av, '@')) {
546 if (cp == NULL || cp == p)
561 /* Check that we got a host name. */
565 SSLeay_add_all_algorithms();
566 ERR_load_crypto_strings();
568 /* Initialize the command to execute on remote host. */
569 buffer_init(&command);
572 * Save the command to execute on the remote host in a buffer. There
573 * is no limit on the length of the command, except by the maximum
574 * packet size. Also sets the tty flag if there is no command.
577 /* No command specified - execute shell on a tty. */
579 if (subsystem_flag) {
581 "You must specify a subsystem to invoke.\n");
585 /* A command has been specified. Store it into the buffer. */
586 for (i = 0; i < ac; i++) {
588 buffer_append(&command, " ", 1);
589 buffer_append(&command, av[i], strlen(av[i]));
593 /* Cannot fork to background if no command. */
594 if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag)
595 fatal("Cannot fork into background without a command to execute.");
597 /* Allocate a tty by default if no command specified. */
598 if (buffer_len(&command) == 0)
604 /* Do not allocate a tty if stdin is not a tty. */
605 if (!isatty(fileno(stdin)) && !force_tty_flag) {
607 log("Pseudo-terminal will not be allocated because stdin is not a terminal.");
612 * Initialize "log" output. Since we are the client all output
613 * actually goes to stderr.
615 log_init(av[0], options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level,
616 SYSLOG_FACILITY_USER, 1);
619 * Read per-user configuration file. Ignore the system wide config
620 * file if the user specifies a config file on the command line.
622 if (config != NULL) {
623 if (!read_config_file(config, host, &options))
624 fatal("Can't open user config file %.100s: "
625 "%.100s", config, strerror(errno));
627 snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir,
628 _PATH_SSH_USER_CONFFILE);
629 (void)read_config_file(buf, host, &options);
631 /* Read systemwide configuration file after use config. */
632 (void)read_config_file(_PATH_HOST_CONFIG_FILE, host, &options);
635 /* Fill configuration defaults. */
636 fill_default_options(&options);
639 log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 1);
643 if (options.user == NULL)
644 options.user = xstrdup(pw->pw_name);
646 if (options.hostname != NULL)
647 host = options.hostname;
649 /* Disable rhosts authentication if not running as root. */
651 /* Ignore uid if running under Windows */
652 if (!options.use_privileged_port) {
654 if (original_effective_uid != 0 || !options.use_privileged_port) {
656 debug("Rhosts Authentication disabled, "
657 "originating port will not be trusted.");
658 options.rhosts_authentication = 0;
661 * If using rsh has been selected, exec it now (without trying
662 * anything else). Note that we must release privileges first.
664 if (options.use_rsh) {
666 * Restore our superuser privileges. This must be done
667 * before permanently setting the uid.
671 /* Switch to the original uid permanently. */
672 permanently_set_uid(pw);
675 rsh_connect(host, options.user, &command);
676 fatal("rsh_connect returned");
678 /* Restore our superuser privileges. */
681 /* Open a connection to the remote host. */
683 cerr = ssh_connect(host, &hostaddr, options.port,
684 options.connection_attempts,
685 original_effective_uid != 0 || !options.use_privileged_port,
686 pw, options.proxy_command);
689 * If we successfully made the connection, load the host private key
690 * in case we will need it later for combined rsa-rhosts
691 * authentication. This must be done before releasing extra
692 * privileges, because the file is only readable by root.
694 sensitive_data.nkeys = 0;
695 sensitive_data.keys = NULL;
696 if (!cerr && (options.rhosts_rsa_authentication ||
697 options.hostbased_authentication)) {
698 sensitive_data.nkeys = 3;
699 sensitive_data.keys = xmalloc(sensitive_data.nkeys*sizeof(Key));
700 sensitive_data.keys[0] = key_load_private_type(KEY_RSA1,
701 _PATH_HOST_KEY_FILE, "", NULL);
702 sensitive_data.keys[1] = key_load_private_type(KEY_DSA,
703 _PATH_HOST_DSA_KEY_FILE, "", NULL);
704 sensitive_data.keys[2] = key_load_private_type(KEY_RSA,
705 _PATH_HOST_RSA_KEY_FILE, "", NULL);
708 * Get rid of any extra privileges that we may have. We will no
709 * longer need them. Also, extra privileges could make it very hard
710 * to read identity files and other non-world-readable files from the
711 * user's home directory if it happens to be on a NFS volume where
712 * root is mapped to nobody.
716 * Note that some legacy systems need to postpone the following call
717 * to permanently_set_uid() until the private hostkey is destroyed
718 * with RSA_free(). Otherwise the calling user could ptrace() the
719 * process, read the private hostkey and impersonate the host.
720 * OpenBSD does not allow ptracing of setuid processes.
722 permanently_set_uid(pw);
725 * Now that we are back to our own permissions, create ~/.ssh
726 * directory if it doesn\'t already exist.
728 snprintf(buf, sizeof buf, "%.100s%s%.100s", pw->pw_dir, strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR);
729 if (stat(buf, &st) < 0)
730 if (mkdir(buf, 0700) < 0)
731 error("Could not create directory '%.200s'.", buf);
733 /* Check if the connection failed, and try "rsh" if appropriate. */
735 if (!options.fallback_to_rsh)
737 if (options.port != 0)
738 log("Secure connection to %.100s on port %hu refused; "
739 "reverting to insecure method",
742 log("Secure connection to %.100s refused; "
743 "reverting to insecure method.", host);
745 rsh_connect(host, options.user, &command);
746 fatal("rsh_connect returned");
748 /* load options.identity_files */
749 load_public_identity_files();
751 /* Expand ~ in known host file names. */
753 options.system_hostfile =
754 tilde_expand_filename(options.system_hostfile, original_real_uid);
755 options.user_hostfile =
756 tilde_expand_filename(options.user_hostfile, original_real_uid);
757 options.system_hostfile2 =
758 tilde_expand_filename(options.system_hostfile2, original_real_uid);
759 options.user_hostfile2 =
760 tilde_expand_filename(options.user_hostfile2, original_real_uid);
762 /* Log into the remote system. This never returns if the login fails. */
763 ssh_login(sensitive_data.keys, sensitive_data.nkeys,
764 host, (struct sockaddr *)&hostaddr, pw);
766 /* We no longer need the private host keys. Clear them now. */
767 if (sensitive_data.nkeys != 0) {
768 for (i = 0; i < sensitive_data.nkeys; i++) {
769 if (sensitive_data.keys[i] != NULL) {
770 /* Destroys contents safely */
771 debug3("clear hostkey %d", i);
772 key_free(sensitive_data.keys[i]);
773 sensitive_data.keys[i] = NULL;
776 xfree(sensitive_data.keys);
778 for (i = 0; i < options.num_identity_files; i++) {
779 if (options.identity_files[i]) {
780 xfree(options.identity_files[i]);
781 options.identity_files[i] = NULL;
783 if (options.identity_keys[i]) {
784 key_free(options.identity_keys[i]);
785 options.identity_keys[i] = NULL;
789 exit_status = compat20 ? ssh_session2() : ssh_session();
795 x11_get_proto(char *proto, int proto_len, char *data, int data_len)
801 if (options.xauth_location) {
802 /* Try to get Xauthority information for the display. */
803 snprintf(line, sizeof line, "%.100s list %.200s 2>" _PATH_DEVNULL,
804 options.xauth_location, getenv("DISPLAY"));
805 f = popen(line, "r");
806 if (f && fgets(line, sizeof(line), f) &&
807 sscanf(line, "%*s %s %s", proto, data) == 2)
813 * If we didn't get authentication data, just make up some
814 * data. The forwarding code will check the validity of the
815 * response anyway, and substitute this data. The X11
816 * server, however, will ignore this fake data and use
817 * whatever authentication mechanisms it was using otherwise
818 * for the local connection.
823 strlcpy(proto, "MIT-MAGIC-COOKIE-1", proto_len);
824 for (i = 0; i < 16; i++) {
827 snprintf(data + 2 * i, data_len - 2 * i, "%02x", rand & 0xff);
834 ssh_init_forwarding(void)
839 /* Initiate local TCP/IP port forwardings. */
840 for (i = 0; i < options.num_local_forwards; i++) {
841 debug("Connections to local port %d forwarded to remote address %.200s:%d",
842 options.local_forwards[i].port,
843 options.local_forwards[i].host,
844 options.local_forwards[i].host_port);
845 success += channel_request_local_forwarding(
846 options.local_forwards[i].port,
847 options.local_forwards[i].host,
848 options.local_forwards[i].host_port,
849 options.gateway_ports);
851 if (i > 0 && success == 0)
852 error("Could not request local forwarding.");
854 /* Initiate remote TCP/IP port forwardings. */
855 for (i = 0; i < options.num_remote_forwards; i++) {
856 debug("Connections to remote port %d forwarded to local address %.200s:%d",
857 options.remote_forwards[i].port,
858 options.remote_forwards[i].host,
859 options.remote_forwards[i].host_port);
860 channel_request_remote_forwarding(
861 options.remote_forwards[i].port,
862 options.remote_forwards[i].host,
863 options.remote_forwards[i].host_port);
868 check_agent_present(void)
870 if (options.forward_agent) {
871 /* Clear agent forwarding if we don\'t have an agent. */
872 int authfd = ssh_get_authentication_socket();
874 options.forward_agent = 0;
876 ssh_close_authentication_socket(authfd);
890 /* Enable compression if requested. */
891 if (options.compression) {
892 debug("Requesting compression at level %d.", options.compression_level);
894 if (options.compression_level < 1 || options.compression_level > 9)
895 fatal("Compression level must be from 1 (fast) to 9 (slow, best).");
897 /* Send the request. */
898 packet_start(SSH_CMSG_REQUEST_COMPRESSION);
899 packet_put_int(options.compression_level);
902 type = packet_read(&plen);
903 if (type == SSH_SMSG_SUCCESS)
904 packet_start_compression(options.compression_level);
905 else if (type == SSH_SMSG_FAILURE)
906 log("Warning: Remote host refused compression.");
908 packet_disconnect("Protocol error waiting for compression response.");
910 /* Allocate a pseudo tty if appropriate. */
912 debug("Requesting pty.");
914 /* Start the packet. */
915 packet_start(SSH_CMSG_REQUEST_PTY);
917 /* Store TERM in the packet. There is no limit on the
918 length of the string. */
922 packet_put_cstring(cp);
924 /* Store window size in the packet. */
925 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
926 memset(&ws, 0, sizeof(ws));
927 packet_put_int(ws.ws_row);
928 packet_put_int(ws.ws_col);
929 packet_put_int(ws.ws_xpixel);
930 packet_put_int(ws.ws_ypixel);
932 /* Store tty modes in the packet. */
933 tty_make_modes(fileno(stdin), NULL);
935 /* Send the packet, and wait for it to leave. */
939 /* Read response from the server. */
940 type = packet_read(&plen);
941 if (type == SSH_SMSG_SUCCESS) {
944 } else if (type == SSH_SMSG_FAILURE)
945 log("Warning: Remote host failed or refused to allocate a pseudo tty.");
947 packet_disconnect("Protocol error waiting for pty request response.");
949 /* Request X11 forwarding if enabled and DISPLAY is set. */
950 if (options.forward_x11 && getenv("DISPLAY") != NULL) {
951 char proto[512], data[512];
952 /* Get reasonable local authentication information. */
953 x11_get_proto(proto, sizeof proto, data, sizeof data);
954 /* Request forwarding with authentication spoofing. */
955 debug("Requesting X11 forwarding with authentication spoofing.");
956 x11_request_forwarding_with_spoofing(0, proto, data);
958 /* Read response from the server. */
959 type = packet_read(&plen);
960 if (type == SSH_SMSG_SUCCESS) {
962 } else if (type == SSH_SMSG_FAILURE) {
963 log("Warning: Remote host denied X11 forwarding.");
965 packet_disconnect("Protocol error waiting for X11 forwarding");
968 /* Tell the packet module whether this is an interactive session. */
969 packet_set_interactive(interactive);
971 /* Request authentication agent forwarding if appropriate. */
972 check_agent_present();
974 if (options.forward_agent) {
975 debug("Requesting authentication agent forwarding.");
976 auth_request_forwarding();
978 /* Read response from the server. */
979 type = packet_read(&plen);
980 packet_integrity_check(plen, 0, type);
981 if (type != SSH_SMSG_SUCCESS)
982 log("Warning: Remote host denied authentication agent forwarding.");
985 /* Initiate port forwardings. */
986 ssh_init_forwarding();
988 /* If requested, let ssh continue in the background. */
989 if (fork_after_authentication_flag)
990 if (daemon(1, 1) < 0)
991 fatal("daemon() failed: %.200s", strerror(errno));
994 * If a command was specified on the command line, execute the
995 * command now. Otherwise request the server to start a shell.
997 if (buffer_len(&command) > 0) {
998 int len = buffer_len(&command);
1001 debug("Sending command: %.*s", len, buffer_ptr(&command));
1002 packet_start(SSH_CMSG_EXEC_CMD);
1003 packet_put_string(buffer_ptr(&command), buffer_len(&command));
1005 packet_write_wait();
1007 debug("Requesting shell.");
1008 packet_start(SSH_CMSG_EXEC_SHELL);
1010 packet_write_wait();
1013 /* Enter the interactive session. */
1014 return client_loop(have_tty, tty_flag ?
1015 options.escape_char : SSH_ESCAPECHAR_NONE, 0);
1019 client_subsystem_reply(int type, int plen, void *ctxt)
1023 id = packet_get_int();
1024 len = buffer_len(&command);
1028 if (type == SSH2_MSG_CHANNEL_FAILURE)
1029 fatal("Request for subsystem '%.*s' failed on channel %d",
1030 len, buffer_ptr(&command), id);
1033 /* request pty/x11/agent/tcpfwd/shell for channel */
1035 ssh_session2_setup(int id, void *arg)
1038 int interactive = 0;
1041 debug("ssh_session2_setup: id %d", id);
1046 cp = getenv("TERM");
1049 /* Store window size in the packet. */
1050 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
1051 memset(&ws, 0, sizeof(ws));
1053 channel_request_start(id, "pty-req", 0);
1054 packet_put_cstring(cp);
1055 packet_put_int(ws.ws_col);
1056 packet_put_int(ws.ws_row);
1057 packet_put_int(ws.ws_xpixel);
1058 packet_put_int(ws.ws_ypixel);
1059 tio = get_saved_tio();
1060 tty_make_modes(/*ignored*/ 0, &tio);
1063 /* XXX wait for reply */
1065 if (options.forward_x11 &&
1066 getenv("DISPLAY") != NULL) {
1067 char proto[512], data[512];
1068 /* Get reasonable local authentication information. */
1069 x11_get_proto(proto, sizeof proto, data, sizeof data);
1070 /* Request forwarding with authentication spoofing. */
1071 debug("Requesting X11 forwarding with authentication spoofing.");
1072 x11_request_forwarding_with_spoofing(id, proto, data);
1074 /* XXX wait for reply */
1077 check_agent_present();
1078 if (options.forward_agent) {
1079 debug("Requesting authentication agent forwarding.");
1080 channel_request_start(id, "auth-agent-req@openssh.com", 0);
1084 len = buffer_len(&command);
1088 if (subsystem_flag) {
1089 debug("Sending subsystem: %.*s", len, buffer_ptr(&command));
1090 channel_request_start(id, "subsystem", /*want reply*/ 1);
1091 /* register callback for reply */
1092 /* XXX we asume that client_loop has already been called */
1093 dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &client_subsystem_reply);
1094 dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &client_subsystem_reply);
1096 debug("Sending command: %.*s", len, buffer_ptr(&command));
1097 channel_request_start(id, "exec", 0);
1099 packet_put_string(buffer_ptr(&command), buffer_len(&command));
1102 channel_request(id, "shell", 0);
1104 /* channel_callback(id, SSH2_MSG_OPEN_CONFIGMATION, client_init, 0); */
1106 /* register different callback, etc. XXX */
1107 packet_set_interactive(interactive);
1110 /* open new channel for a session */
1112 ssh_session2_open(void)
1115 int window, packetmax, in, out, err;
1117 if (stdin_null_flag) {
1118 in = open(_PATH_DEVNULL, O_RDONLY);
1120 in = dup(STDIN_FILENO);
1122 out = dup(STDOUT_FILENO);
1123 err = dup(STDERR_FILENO);
1125 if (in < 0 || out < 0 || err < 0)
1126 fatal("dup() in/out/err failed");
1128 /* enable nonblocking unless tty */
1136 window = CHAN_SES_WINDOW_DEFAULT;
1137 packetmax = CHAN_SES_PACKET_DEFAULT;
1143 "session", SSH_CHANNEL_OPENING, in, out, err,
1144 window, packetmax, CHAN_EXTENDED_WRITE,
1145 xstrdup("client-session"), /*nonblock*/0);
1147 fatal("ssh_session2_open: channel_new failed");
1149 debug3("ssh_session2_open: channel_new: %d", c->self);
1151 channel_send_open(c->self);
1153 channel_register_callback(c->self,
1154 SSH2_MSG_CHANNEL_OPEN_CONFIRMATION,
1155 ssh_session2_setup, (void *)0);
1165 /* XXX should be pre-session */
1166 ssh_init_forwarding();
1168 if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN))
1169 id = ssh_session2_open();
1171 /* If requested, let ssh continue in the background. */
1172 if (fork_after_authentication_flag)
1173 if (daemon(1, 1) < 0)
1174 fatal("daemon() failed: %.200s", strerror(errno));
1176 return client_loop(tty_flag, tty_flag ?
1177 options.escape_char : SSH_ESCAPECHAR_NONE, id);
1181 load_public_identity_files(void)
1188 if (options.smartcard_device != NULL &&
1189 options.num_identity_files + 1 < SSH_MAX_IDENTITY_FILES &&
1190 (public = sc_get_key(options.smartcard_device)) != NULL ) {
1193 if (options.num_identity_files + 2 > SSH_MAX_IDENTITY_FILES)
1194 options.num_identity_files = SSH_MAX_IDENTITY_FILES - 2;
1195 memmove(&options.identity_files[2], &options.identity_files[0],
1196 sizeof(char *) * options.num_identity_files);
1197 options.num_identity_files += 2;
1200 /* XXX ssh1 vs ssh2 */
1201 new = key_new(KEY_RSA);
1202 new->flags = KEY_FLAG_EXT;
1203 BN_copy(new->rsa->n, public->rsa->n);
1204 BN_copy(new->rsa->e, public->rsa->e);
1205 RSA_set_method(new->rsa, sc_get_engine());
1206 options.identity_keys[0] = new;
1207 options.identity_files[0] = xstrdup("smartcard rsa key");;
1209 new = key_new(KEY_RSA1);
1210 new->flags = KEY_FLAG_EXT;
1211 BN_copy(new->rsa->n, public->rsa->n);
1212 BN_copy(new->rsa->e, public->rsa->e);
1213 RSA_set_method(new->rsa, sc_get_engine());
1214 options.identity_keys[1] = new;
1215 options.identity_files[1] = xstrdup("smartcard rsa1 key");
1219 #endif /* SMARTCARD */
1220 for (; i < options.num_identity_files; i++) {
1221 filename = tilde_expand_filename(options.identity_files[i],
1223 public = key_load_public(filename, NULL);
1224 debug("identity file %s type %d", filename,
1225 public ? public->type : -1);
1226 xfree(options.identity_files[i]);
1227 options.identity_files[i] = filename;
1228 options.identity_keys[i] = public;