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 1.136 2001/08/02 15:43:57 jakob 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>
75 #endif /* SMARTCARD */
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;
154 /* Prints a help message to the user. This function never returns. */
159 fprintf(stderr, "Usage: %s [options] host [command]\n", __progname);
160 fprintf(stderr, "Options:\n");
161 fprintf(stderr, " -l user Log in using this user name.\n");
162 fprintf(stderr, " -n Redirect input from " _PATH_DEVNULL ".\n");
163 fprintf(stderr, " -A Enable authentication agent forwarding.\n");
164 fprintf(stderr, " -a Disable authentication agent forwarding (default).\n");
166 fprintf(stderr, " -k Disable Kerberos ticket and AFS token forwarding.\n");
168 fprintf(stderr, " -X Enable X11 connection forwarding.\n");
169 fprintf(stderr, " -x Disable X11 connection forwarding (default).\n");
170 fprintf(stderr, " -i file Identity for public key authentication "
171 "(default: ~/.ssh/identity)\n");
173 fprintf(stderr, " -I reader Set smartcard reader.\n");
174 #endif /* SMARTCARD */
175 fprintf(stderr, " -t Tty; allocate a tty even if command is given.\n");
176 fprintf(stderr, " -T Do not allocate a tty.\n");
177 fprintf(stderr, " -v Verbose; display verbose debugging messages.\n");
178 fprintf(stderr, " Multiple -v increases verbosity.\n");
179 fprintf(stderr, " -V Display version number only.\n");
180 fprintf(stderr, " -P Don't allocate a privileged port.\n");
181 fprintf(stderr, " -q Quiet; don't display any warning messages.\n");
182 fprintf(stderr, " -f Fork into background after authentication.\n");
183 fprintf(stderr, " -e char Set escape character; ``none'' = disable (default: ~).\n");
185 fprintf(stderr, " -c cipher Select encryption algorithm\n");
186 fprintf(stderr, " -m macs Specify MAC algorithms for protocol version 2.\n");
187 fprintf(stderr, " -p port Connect to this port. Server must be on the same port.\n");
188 fprintf(stderr, " -L listen-port:host:port Forward local port to remote address\n");
189 fprintf(stderr, " -R listen-port:host:port Forward remote port to local address\n");
190 fprintf(stderr, " These cause %s to listen for connections on a port, and\n", __progname);
191 fprintf(stderr, " forward them to the other side by connecting to host:port.\n");
192 fprintf(stderr, " -C Enable compression.\n");
193 fprintf(stderr, " -N Do not execute a shell or command.\n");
194 fprintf(stderr, " -g Allow remote hosts to connect to forwarded ports.\n");
195 fprintf(stderr, " -1 Force protocol version 1.\n");
196 fprintf(stderr, " -2 Force protocol version 2.\n");
197 fprintf(stderr, " -4 Use IPv4 only.\n");
198 fprintf(stderr, " -6 Use IPv6 only.\n");
199 fprintf(stderr, " -o 'option' Process the option as if it was read from a configuration file.\n");
200 fprintf(stderr, " -s Invoke command (mandatory) as SSH2 subsystem.\n");
201 fprintf(stderr, " -b addr Local IP address.\n");
206 * Connects to the given host using rsh (or prints an error message and exits
207 * if rsh is not available). This function never returns.
210 rsh_connect(char *host, char *user, Buffer * command)
215 log("Using rsh. WARNING: Connection will not be encrypted.");
216 /* Build argument list for rsh. */
218 args[i++] = _PATH_RSH;
219 /* host may have to come after user on some systems */
225 if (buffer_len(command) > 0) {
226 buffer_append(command, "\0", 1);
227 args[i++] = buffer_ptr(command);
231 for (i = 0; args[i]; i++) {
233 fprintf(stderr, " ");
234 fprintf(stderr, "%s", args[i]);
236 fprintf(stderr, "\n");
238 execv(_PATH_RSH, args);
243 static int ssh_session(void);
244 static int ssh_session2(void);
245 static void load_public_identity_files(void);
248 * Main program for the ssh client.
251 main(int ac, char **av)
253 int i, opt, exit_status, cerr;
254 u_short fwd_port, fwd_host_port;
255 char *p, *cp, buf[256];
259 uid_t original_effective_uid;
265 __progname = get_progname(av[0]);
269 * Save the original real uid. It will be needed later (uid-swapping
270 * may clobber the real uid).
272 original_real_uid = getuid();
273 original_effective_uid = geteuid();
275 #ifdef HAVE_SETRLIMIT
276 /* If we are installed setuid root be careful to not drop core. */
277 if (original_real_uid != original_effective_uid) {
279 rlim.rlim_cur = rlim.rlim_max = 0;
280 if (setrlimit(RLIMIT_CORE, &rlim) < 0)
281 fatal("setrlimit failed: %.100s", strerror(errno));
285 pw = getpwuid(original_real_uid);
287 log("You don't exist, go away!");
290 /* Take a copy of the returned structure. */
294 * Use uid-swapping to give up root privileges for the duration of
295 * option processing. We will re-instantiate the rights when we are
296 * ready to create the privileged port, and will permanently drop
297 * them when the port has been created (actually, when the connection
298 * has been made, as we may need to create the port several times).
300 temporarily_use_uid(pw);
303 * Set our umask to something reasonable, as some files are created
304 * with the default umask. This will make them world-readable but
305 * writable only by the owner, which is ok for all files for which we
306 * don't set the modes explicitly.
310 /* Initialize option structure to indicate that no values have been set. */
311 initialize_options(&options);
313 /* Parse command-line arguments. */
317 while ((opt = getopt(ac, av,
318 "1246ab:c:e:fgi:kl:m:no:p:qstvxACD:I:L:NPR:TVX")) != -1) {
321 options.protocol = SSH_PROTO_1;
324 options.protocol = SSH_PROTO_2;
336 fork_after_authentication_flag = 1;
340 options.forward_x11 = 0;
343 options.forward_x11 = 1;
346 options.gateway_ports = 1;
349 options.use_privileged_port = 0;
352 options.forward_agent = 0;
355 options.forward_agent = 1;
359 options.kerberos_tgt_passing = 0;
360 options.afs_token_passing = 0;
364 if (stat(optarg, &st) < 0) {
365 fprintf(stderr, "Warning: Identity file %s "
366 "does not exist.\n", optarg);
369 if (options.num_identity_files >=
370 SSH_MAX_IDENTITY_FILES)
371 fatal("Too many identity files specified "
372 "(max %d)", SSH_MAX_IDENTITY_FILES);
373 options.identity_files[options.num_identity_files++] =
378 options.smartcard_device = xstrdup(optarg);
379 #else /* SMARTCARD */
380 fprintf(stderr, "no support for smartcards.\n");
381 #endif /* SMARTCARD */
389 if (0 == debug_flag) {
391 options.log_level = SYSLOG_LEVEL_DEBUG1;
392 } else if (options.log_level < SYSLOG_LEVEL_DEBUG3) {
396 fatal("Too high debugging level.");
400 "%s, SSH protocols %d.%d/%d.%d, OpenSSL 0x%8.8lx\n",
402 PROTOCOL_MAJOR_1, PROTOCOL_MINOR_1,
403 PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2,
409 options.log_level = SYSLOG_LEVEL_QUIET;
412 if (optarg[0] == '^' && optarg[2] == 0 &&
413 (u_char) optarg[1] >= 64 &&
414 (u_char) optarg[1] < 128)
415 options.escape_char = (u_char) optarg[1] & 31;
416 else if (strlen(optarg) == 1)
417 options.escape_char = (u_char) optarg[0];
418 else if (strcmp(optarg, "none") == 0)
419 options.escape_char = SSH_ESCAPECHAR_NONE;
421 fprintf(stderr, "Bad escape character '%s'.\n",
427 if (ciphers_valid(optarg)) {
429 options.ciphers = xstrdup(optarg);
430 options.cipher = SSH_CIPHER_ILLEGAL;
433 options.cipher = cipher_number(optarg);
434 if (options.cipher == -1) {
436 "Unknown cipher type '%s'\n",
440 if (options.cipher == SSH_CIPHER_3DES)
441 options.ciphers = "3des-cbc";
442 else if (options.cipher == SSH_CIPHER_BLOWFISH)
443 options.ciphers = "blowfish-cbc";
445 options.ciphers = (char *)-1;
449 if (mac_valid(optarg))
450 options.macs = xstrdup(optarg);
452 fprintf(stderr, "Unknown mac type '%s'\n",
458 options.port = a2port(optarg);
459 if (options.port == 0) {
460 fprintf(stderr, "Bad port '%s'\n", optarg);
465 options.user = optarg;
468 if (sscanf(optarg, "%hu/%255[^/]/%hu", &fwd_port, buf,
469 &fwd_host_port) != 3 &&
470 sscanf(optarg, "%hu:%255[^:]:%hu", &fwd_port, buf,
471 &fwd_host_port) != 3) {
473 "Bad forwarding specification '%s'.\n",
478 add_remote_forward(&options, fwd_port, buf,
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) {
487 "Bad forwarding specification '%s'.\n",
492 add_local_forward(&options, fwd_port, buf,
497 fwd_port = a2port(optarg);
499 fprintf(stderr, "Bad dynamic port '%s'\n",
503 add_local_forward(&options, fwd_port, "socks4", 0);
507 options.compression = 1;
518 if (process_config_line(&options, host ? host : "",
519 optarg, "command-line", 0, &dummy) != 0)
526 options.bind_address = optarg;
536 if (ac > 0 && !host && **av != '-') {
537 if (strchr(*av, '@')) {
540 if (cp == NULL || cp == p)
555 /* Check that we got a host name. */
559 SSLeay_add_all_algorithms();
560 ERR_load_crypto_strings();
562 /* Initialize the command to execute on remote host. */
563 buffer_init(&command);
566 * Save the command to execute on the remote host in a buffer. There
567 * is no limit on the length of the command, except by the maximum
568 * packet size. Also sets the tty flag if there is no command.
571 /* No command specified - execute shell on a tty. */
573 if (subsystem_flag) {
575 "You must specify a subsystem to invoke.\n");
579 /* A command has been specified. Store it into the buffer. */
580 for (i = 0; i < ac; i++) {
582 buffer_append(&command, " ", 1);
583 buffer_append(&command, av[i], strlen(av[i]));
587 /* Cannot fork to background if no command. */
588 if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag)
589 fatal("Cannot fork into background without a command to execute.");
591 /* Allocate a tty by default if no command specified. */
592 if (buffer_len(&command) == 0)
598 /* Do not allocate a tty if stdin is not a tty. */
599 if (!isatty(fileno(stdin)) && !force_tty_flag) {
601 log("Pseudo-terminal will not be allocated because stdin is not a terminal.");
606 * Initialize "log" output. Since we are the client all output
607 * actually goes to stderr.
609 log_init(av[0], options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level,
610 SYSLOG_FACILITY_USER, 1);
612 /* Read per-user configuration file. */
613 snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, _PATH_SSH_USER_CONFFILE);
614 read_config_file(buf, host, &options);
616 /* Read systemwide configuration file. */
617 read_config_file(_PATH_HOST_CONFIG_FILE, host, &options);
619 /* Fill configuration defaults. */
620 fill_default_options(&options);
623 log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 1);
627 if (options.user == NULL)
628 options.user = xstrdup(pw->pw_name);
630 if (options.hostname != NULL)
631 host = options.hostname;
633 /* Disable rhosts authentication if not running as root. */
635 /* Ignore uid if running under Windows */
636 if (!options.use_privileged_port) {
638 if (original_effective_uid != 0 || !options.use_privileged_port) {
640 debug("Rhosts Authentication disabled, "
641 "originating port will not be trusted.");
642 options.rhosts_authentication = 0;
645 * If using rsh has been selected, exec it now (without trying
646 * anything else). Note that we must release privileges first.
648 if (options.use_rsh) {
650 * Restore our superuser privileges. This must be done
651 * before permanently setting the uid.
655 /* Switch to the original uid permanently. */
656 permanently_set_uid(pw);
659 rsh_connect(host, options.user, &command);
660 fatal("rsh_connect returned");
662 /* Restore our superuser privileges. */
665 /* Open a connection to the remote host. */
667 cerr = ssh_connect(host, &hostaddr, options.port,
668 options.connection_attempts,
669 original_effective_uid != 0 || !options.use_privileged_port,
670 pw, options.proxy_command);
673 * If we successfully made the connection, load the host private key
674 * in case we will need it later for combined rsa-rhosts
675 * authentication. This must be done before releasing extra
676 * privileges, because the file is only readable by root.
678 sensitive_data.nkeys = 0;
679 sensitive_data.keys = NULL;
680 if (!cerr && (options.rhosts_rsa_authentication ||
681 options.hostbased_authentication)) {
682 sensitive_data.nkeys = 3;
683 sensitive_data.keys = xmalloc(sensitive_data.nkeys*sizeof(Key));
684 sensitive_data.keys[0] = key_load_private_type(KEY_RSA1,
685 _PATH_HOST_KEY_FILE, "", NULL);
686 sensitive_data.keys[1] = key_load_private_type(KEY_DSA,
687 _PATH_HOST_DSA_KEY_FILE, "", NULL);
688 sensitive_data.keys[2] = key_load_private_type(KEY_RSA,
689 _PATH_HOST_RSA_KEY_FILE, "", NULL);
692 * Get rid of any extra privileges that we may have. We will no
693 * longer need them. Also, extra privileges could make it very hard
694 * to read identity files and other non-world-readable files from the
695 * user's home directory if it happens to be on a NFS volume where
696 * root is mapped to nobody.
700 * Note that some legacy systems need to postpone the following call
701 * to permanently_set_uid() until the private hostkey is destroyed
702 * with RSA_free(). Otherwise the calling user could ptrace() the
703 * process, read the private hostkey and impersonate the host.
704 * OpenBSD does not allow ptracing of setuid processes.
706 permanently_set_uid(pw);
709 * Now that we are back to our own permissions, create ~/.ssh
710 * directory if it doesn\'t already exist.
712 snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, _PATH_SSH_USER_DIR);
713 if (stat(buf, &st) < 0)
714 if (mkdir(buf, 0700) < 0)
715 error("Could not create directory '%.200s'.", buf);
717 /* Check if the connection failed, and try "rsh" if appropriate. */
719 if (!options.fallback_to_rsh)
721 if (options.port != 0)
722 log("Secure connection to %.100s on port %hu refused; "
723 "reverting to insecure method",
726 log("Secure connection to %.100s refused; "
727 "reverting to insecure method.", host);
729 rsh_connect(host, options.user, &command);
730 fatal("rsh_connect returned");
732 /* load options.identity_files */
733 load_public_identity_files();
735 /* Expand ~ in known host file names. */
737 options.system_hostfile =
738 tilde_expand_filename(options.system_hostfile, original_real_uid);
739 options.user_hostfile =
740 tilde_expand_filename(options.user_hostfile, original_real_uid);
741 options.system_hostfile2 =
742 tilde_expand_filename(options.system_hostfile2, original_real_uid);
743 options.user_hostfile2 =
744 tilde_expand_filename(options.user_hostfile2, original_real_uid);
746 /* Log into the remote system. This never returns if the login fails. */
747 ssh_login(sensitive_data.keys, sensitive_data.nkeys,
748 host, (struct sockaddr *)&hostaddr, pw);
750 /* We no longer need the private host keys. Clear them now. */
751 if (sensitive_data.nkeys != 0) {
752 for (i = 0; i < sensitive_data.nkeys; i++) {
753 if (sensitive_data.keys[i] != NULL) {
754 /* Destroys contents safely */
755 debug3("clear hostkey %d", i);
756 key_free(sensitive_data.keys[i]);
757 sensitive_data.keys[i] = NULL;
760 xfree(sensitive_data.keys);
762 for (i = 0; i < options.num_identity_files; i++) {
763 if (options.identity_files[i]) {
764 xfree(options.identity_files[i]);
765 options.identity_files[i] = NULL;
767 if (options.identity_keys[i]) {
768 key_free(options.identity_keys[i]);
769 options.identity_keys[i] = NULL;
773 exit_status = compat20 ? ssh_session2() : ssh_session();
779 x11_get_proto(char *proto, int proto_len, char *data, int data_len)
785 if (options.xauth_location) {
786 /* Try to get Xauthority information for the display. */
787 snprintf(line, sizeof line, "%.100s list %.200s 2>" _PATH_DEVNULL,
788 options.xauth_location, getenv("DISPLAY"));
789 f = popen(line, "r");
790 if (f && fgets(line, sizeof(line), f) &&
791 sscanf(line, "%*s %s %s", proto, data) == 2)
797 * If we didn't get authentication data, just make up some
798 * data. The forwarding code will check the validity of the
799 * response anyway, and substitute this data. The X11
800 * server, however, will ignore this fake data and use
801 * whatever authentication mechanisms it was using otherwise
802 * for the local connection.
807 strlcpy(proto, "MIT-MAGIC-COOKIE-1", proto_len);
808 for (i = 0; i < 16; i++) {
811 snprintf(data + 2 * i, data_len - 2 * i, "%02x", rand & 0xff);
818 ssh_init_forwarding(void)
823 /* Initiate local TCP/IP port forwardings. */
824 for (i = 0; i < options.num_local_forwards; i++) {
825 debug("Connections to local port %d forwarded to remote address %.200s:%d",
826 options.local_forwards[i].port,
827 options.local_forwards[i].host,
828 options.local_forwards[i].host_port);
829 success += channel_request_local_forwarding(
830 options.local_forwards[i].port,
831 options.local_forwards[i].host,
832 options.local_forwards[i].host_port,
833 options.gateway_ports);
835 if (i > 0 && success == 0)
836 error("Could not request local forwarding.");
838 /* Initiate remote TCP/IP port forwardings. */
839 for (i = 0; i < options.num_remote_forwards; i++) {
840 debug("Connections to remote port %d forwarded to local address %.200s:%d",
841 options.remote_forwards[i].port,
842 options.remote_forwards[i].host,
843 options.remote_forwards[i].host_port);
844 channel_request_remote_forwarding(
845 options.remote_forwards[i].port,
846 options.remote_forwards[i].host,
847 options.remote_forwards[i].host_port);
852 check_agent_present(void)
854 if (options.forward_agent) {
855 /* Clear agent forwarding if we don\'t have an agent. */
856 int authfd = ssh_get_authentication_socket();
858 options.forward_agent = 0;
860 ssh_close_authentication_socket(authfd);
874 /* Enable compression if requested. */
875 if (options.compression) {
876 debug("Requesting compression at level %d.", options.compression_level);
878 if (options.compression_level < 1 || options.compression_level > 9)
879 fatal("Compression level must be from 1 (fast) to 9 (slow, best).");
881 /* Send the request. */
882 packet_start(SSH_CMSG_REQUEST_COMPRESSION);
883 packet_put_int(options.compression_level);
886 type = packet_read(&plen);
887 if (type == SSH_SMSG_SUCCESS)
888 packet_start_compression(options.compression_level);
889 else if (type == SSH_SMSG_FAILURE)
890 log("Warning: Remote host refused compression.");
892 packet_disconnect("Protocol error waiting for compression response.");
894 /* Allocate a pseudo tty if appropriate. */
896 debug("Requesting pty.");
898 /* Start the packet. */
899 packet_start(SSH_CMSG_REQUEST_PTY);
901 /* Store TERM in the packet. There is no limit on the
902 length of the string. */
906 packet_put_cstring(cp);
908 /* Store window size in the packet. */
909 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
910 memset(&ws, 0, sizeof(ws));
911 packet_put_int(ws.ws_row);
912 packet_put_int(ws.ws_col);
913 packet_put_int(ws.ws_xpixel);
914 packet_put_int(ws.ws_ypixel);
916 /* Store tty modes in the packet. */
917 tty_make_modes(fileno(stdin), NULL);
919 /* Send the packet, and wait for it to leave. */
923 /* Read response from the server. */
924 type = packet_read(&plen);
925 if (type == SSH_SMSG_SUCCESS) {
928 } else if (type == SSH_SMSG_FAILURE)
929 log("Warning: Remote host failed or refused to allocate a pseudo tty.");
931 packet_disconnect("Protocol error waiting for pty request response.");
933 /* Request X11 forwarding if enabled and DISPLAY is set. */
934 if (options.forward_x11 && getenv("DISPLAY") != NULL) {
935 char proto[512], data[512];
936 /* Get reasonable local authentication information. */
937 x11_get_proto(proto, sizeof proto, data, sizeof data);
938 /* Request forwarding with authentication spoofing. */
939 debug("Requesting X11 forwarding with authentication spoofing.");
940 x11_request_forwarding_with_spoofing(0, proto, data);
942 /* Read response from the server. */
943 type = packet_read(&plen);
944 if (type == SSH_SMSG_SUCCESS) {
946 } else if (type == SSH_SMSG_FAILURE) {
947 log("Warning: Remote host denied X11 forwarding.");
949 packet_disconnect("Protocol error waiting for X11 forwarding");
952 /* Tell the packet module whether this is an interactive session. */
953 packet_set_interactive(interactive);
955 /* Request authentication agent forwarding if appropriate. */
956 check_agent_present();
958 if (options.forward_agent) {
959 debug("Requesting authentication agent forwarding.");
960 auth_request_forwarding();
962 /* Read response from the server. */
963 type = packet_read(&plen);
964 packet_integrity_check(plen, 0, type);
965 if (type != SSH_SMSG_SUCCESS)
966 log("Warning: Remote host denied authentication agent forwarding.");
969 /* Initiate port forwardings. */
970 ssh_init_forwarding();
972 /* If requested, let ssh continue in the background. */
973 if (fork_after_authentication_flag)
974 if (daemon(1, 1) < 0)
975 fatal("daemon() failed: %.200s", strerror(errno));
978 * If a command was specified on the command line, execute the
979 * command now. Otherwise request the server to start a shell.
981 if (buffer_len(&command) > 0) {
982 int len = buffer_len(&command);
985 debug("Sending command: %.*s", len, buffer_ptr(&command));
986 packet_start(SSH_CMSG_EXEC_CMD);
987 packet_put_string(buffer_ptr(&command), buffer_len(&command));
991 debug("Requesting shell.");
992 packet_start(SSH_CMSG_EXEC_SHELL);
997 /* Enter the interactive session. */
998 return client_loop(have_tty, tty_flag ?
999 options.escape_char : SSH_ESCAPECHAR_NONE, 0);
1003 client_subsystem_reply(int type, int plen, void *ctxt)
1007 id = packet_get_int();
1008 len = buffer_len(&command);
1012 if (type == SSH2_MSG_CHANNEL_FAILURE)
1013 fatal("Request for subsystem '%.*s' failed on channel %d",
1014 len, buffer_ptr(&command), id);
1018 ssh_session2_callback(int id, void *arg)
1021 int interactive = 0;
1024 debug("client_init id %d arg %ld", id, (long)arg);
1029 cp = getenv("TERM");
1032 /* Store window size in the packet. */
1033 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
1034 memset(&ws, 0, sizeof(ws));
1036 channel_request_start(id, "pty-req", 0);
1037 packet_put_cstring(cp);
1038 packet_put_int(ws.ws_col);
1039 packet_put_int(ws.ws_row);
1040 packet_put_int(ws.ws_xpixel);
1041 packet_put_int(ws.ws_ypixel);
1042 tio = get_saved_tio();
1043 tty_make_modes(/*ignored*/ 0, &tio);
1046 /* XXX wait for reply */
1048 if (options.forward_x11 &&
1049 getenv("DISPLAY") != NULL) {
1050 char proto[512], data[512];
1051 /* Get reasonable local authentication information. */
1052 x11_get_proto(proto, sizeof proto, data, sizeof data);
1053 /* Request forwarding with authentication spoofing. */
1054 debug("Requesting X11 forwarding with authentication spoofing.");
1055 x11_request_forwarding_with_spoofing(id, proto, data);
1057 /* XXX wait for reply */
1060 check_agent_present();
1061 if (options.forward_agent) {
1062 debug("Requesting authentication agent forwarding.");
1063 channel_request_start(id, "auth-agent-req@openssh.com", 0);
1067 len = buffer_len(&command);
1071 if (subsystem_flag) {
1072 debug("Sending subsystem: %.*s", len, buffer_ptr(&command));
1073 channel_request_start(id, "subsystem", /*want reply*/ 1);
1074 /* register callback for reply */
1075 /* XXX we asume that client_loop has already been called */
1076 dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &client_subsystem_reply);
1077 dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &client_subsystem_reply);
1079 debug("Sending command: %.*s", len, buffer_ptr(&command));
1080 channel_request_start(id, "exec", 0);
1082 packet_put_string(buffer_ptr(&command), buffer_len(&command));
1085 channel_request(id, "shell", 0);
1087 /* channel_callback(id, SSH2_MSG_OPEN_CONFIGMATION, client_init, 0); */
1089 /* register different callback, etc. XXX */
1090 packet_set_interactive(interactive);
1094 ssh_session2_command(void)
1097 int window, packetmax, in, out, err;
1099 if (stdin_null_flag) {
1100 in = open(_PATH_DEVNULL, O_RDONLY);
1102 in = dup(STDIN_FILENO);
1104 out = dup(STDOUT_FILENO);
1105 err = dup(STDERR_FILENO);
1107 if (in < 0 || out < 0 || err < 0)
1108 fatal("dup() in/out/err failed");
1110 /* enable nonblocking unless tty */
1118 window = CHAN_SES_WINDOW_DEFAULT;
1119 packetmax = CHAN_SES_PACKET_DEFAULT;
1125 "session", SSH_CHANNEL_OPENING, in, out, err,
1126 window, packetmax, CHAN_EXTENDED_WRITE,
1127 xstrdup("client-session"), /*nonblock*/0);
1129 fatal("ssh_session2_command: channel_new failed");
1131 debug3("ssh_session2_command: channel_new: %d", c->self);
1133 channel_send_open(c->self);
1134 channel_register_callback(c->self, SSH2_MSG_CHANNEL_OPEN_CONFIRMATION,
1135 ssh_session2_callback, (void *)0);
1145 /* XXX should be pre-session */
1146 ssh_init_forwarding();
1148 id = no_shell_flag ? -1 : ssh_session2_command();
1150 /* If requested, let ssh continue in the background. */
1151 if (fork_after_authentication_flag)
1152 if (daemon(1, 1) < 0)
1153 fatal("daemon() failed: %.200s", strerror(errno));
1155 return client_loop(tty_flag, tty_flag ?
1156 options.escape_char : SSH_ESCAPECHAR_NONE, id);
1160 load_public_identity_files(void)
1167 if (options.smartcard_device != NULL &&
1168 options.num_identity_files + 1 < SSH_MAX_IDENTITY_FILES &&
1169 (public = sc_get_key(options.smartcard_device)) != NULL ) {
1172 if (options.num_identity_files + 2 > SSH_MAX_IDENTITY_FILES)
1173 options.num_identity_files = SSH_MAX_IDENTITY_FILES - 2;
1174 memmove(&options.identity_files[2], &options.identity_files[0],
1175 sizeof(char *) * options.num_identity_files);
1176 options.num_identity_files += 2;
1179 /* XXX ssh1 vs ssh2 */
1180 new = key_new(KEY_RSA);
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[0] = new;
1186 options.identity_files[0] = xstrdup("smartcard rsa key");;
1188 new = key_new(KEY_RSA1);
1189 new->flags = KEY_FLAG_EXT;
1190 BN_copy(new->rsa->n, public->rsa->n);
1191 BN_copy(new->rsa->e, public->rsa->e);
1192 RSA_set_method(new->rsa, sc_get_engine());
1193 options.identity_keys[1] = new;
1194 options.identity_files[1] = xstrdup("smartcard rsa1 key");
1198 #endif /* SMARTCARD */
1199 for (; i < options.num_identity_files; i++) {
1200 filename = tilde_expand_filename(options.identity_files[i],
1202 public = key_load_public(filename, NULL);
1203 debug("identity file %s type %d", filename,
1204 public ? public->type : -1);
1205 xfree(options.identity_files[i]);
1206 options.identity_files[i] = filename;
1207 options.identity_keys[i] = public;