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 1.132 2001/07/31 09:28:44 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>
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");
172 fprintf(stderr, " -t Tty; allocate a tty even if command is given.\n");
173 fprintf(stderr, " -T Do not allocate a tty.\n");
174 fprintf(stderr, " -v Verbose; display verbose debugging messages.\n");
175 fprintf(stderr, " Multiple -v increases verbosity.\n");
176 fprintf(stderr, " -V Display version number only.\n");
177 fprintf(stderr, " -P Don't allocate a privileged port.\n");
178 fprintf(stderr, " -q Quiet; don't display any warning messages.\n");
179 fprintf(stderr, " -f Fork into background after authentication.\n");
180 fprintf(stderr, " -e char Set escape character; ``none'' = disable (default: ~).\n");
182 fprintf(stderr, " -c cipher Select encryption algorithm\n");
183 fprintf(stderr, " -m macs Specify MAC algorithms for protocol version 2.\n");
184 fprintf(stderr, " -p port Connect to this port. Server must be on the same port.\n");
185 fprintf(stderr, " -L listen-port:host:port Forward local port to remote address\n");
186 fprintf(stderr, " -R listen-port:host:port Forward remote port to local address\n");
187 fprintf(stderr, " These cause %s to listen for connections on a port, and\n", __progname);
188 fprintf(stderr, " forward them to the other side by connecting to host:port.\n");
189 fprintf(stderr, " -C Enable compression.\n");
190 fprintf(stderr, " -N Do not execute a shell or command.\n");
191 fprintf(stderr, " -g Allow remote hosts to connect to forwarded ports.\n");
192 fprintf(stderr, " -1 Force protocol version 1.\n");
193 fprintf(stderr, " -2 Force protocol version 2.\n");
194 fprintf(stderr, " -4 Use IPv4 only.\n");
195 fprintf(stderr, " -6 Use IPv6 only.\n");
196 fprintf(stderr, " -o 'option' Process the option as if it was read from a configuration file.\n");
197 fprintf(stderr, " -s Invoke command (mandatory) as SSH2 subsystem.\n");
198 fprintf(stderr, " -b addr Local IP address.\n");
203 * Connects to the given host using rsh (or prints an error message and exits
204 * if rsh is not available). This function never returns.
207 rsh_connect(char *host, char *user, Buffer * command)
212 log("Using rsh. WARNING: Connection will not be encrypted.");
213 /* Build argument list for rsh. */
215 args[i++] = _PATH_RSH;
216 /* host may have to come after user on some systems */
222 if (buffer_len(command) > 0) {
223 buffer_append(command, "\0", 1);
224 args[i++] = buffer_ptr(command);
228 for (i = 0; args[i]; i++) {
230 fprintf(stderr, " ");
231 fprintf(stderr, "%s", args[i]);
233 fprintf(stderr, "\n");
235 execv(_PATH_RSH, args);
240 static int ssh_session(void);
241 static int ssh_session2(void);
242 static void load_public_identity_files(void);
245 * Main program for the ssh client.
248 main(int ac, char **av)
250 int i, opt, exit_status, cerr;
251 u_short fwd_port, fwd_host_port;
252 char *p, *cp, buf[256];
256 uid_t original_effective_uid;
262 __progname = get_progname(av[0]);
266 * Save the original real uid. It will be needed later (uid-swapping
267 * may clobber the real uid).
269 original_real_uid = getuid();
270 original_effective_uid = geteuid();
272 #ifdef HAVE_SETRLIMIT
273 /* If we are installed setuid root be careful to not drop core. */
274 if (original_real_uid != original_effective_uid) {
276 rlim.rlim_cur = rlim.rlim_max = 0;
277 if (setrlimit(RLIMIT_CORE, &rlim) < 0)
278 fatal("setrlimit failed: %.100s", strerror(errno));
282 pw = getpwuid(original_real_uid);
284 log("You don't exist, go away!");
287 /* Take a copy of the returned structure. */
291 * Use uid-swapping to give up root privileges for the duration of
292 * option processing. We will re-instantiate the rights when we are
293 * ready to create the privileged port, and will permanently drop
294 * them when the port has been created (actually, when the connection
295 * has been made, as we may need to create the port several times).
297 temporarily_use_uid(pw);
300 * Set our umask to something reasonable, as some files are created
301 * with the default umask. This will make them world-readable but
302 * writable only by the owner, which is ok for all files for which we
303 * don't set the modes explicitly.
307 /* Initialize option structure to indicate that no values have been set. */
308 initialize_options(&options);
310 /* Parse command-line arguments. */
314 while ((opt = getopt(ac, av,
315 "1246ab:c:e:fgi:kl:m:no:p:qstvxACD:I:L:NPR:TVX")) != -1) {
318 options.protocol = SSH_PROTO_1;
321 options.protocol = SSH_PROTO_2;
333 fork_after_authentication_flag = 1;
337 options.forward_x11 = 0;
340 options.forward_x11 = 1;
343 options.gateway_ports = 1;
346 options.use_privileged_port = 0;
349 options.forward_agent = 0;
352 options.forward_agent = 1;
356 options.kerberos_tgt_passing = 0;
357 options.afs_token_passing = 0;
361 if (stat(optarg, &st) < 0) {
362 fprintf(stderr, "Warning: Identity file %s "
363 "does not exist.\n", optarg);
366 if (options.num_identity_files >=
367 SSH_MAX_IDENTITY_FILES)
368 fatal("Too many identity files specified "
369 "(max %d)", SSH_MAX_IDENTITY_FILES);
370 options.identity_files[options.num_identity_files++] =
375 options.smartcard_device = atoi(optarg);
377 fprintf(stderr, "no support for smartcards.\n");
386 if (0 == debug_flag) {
388 options.log_level = SYSLOG_LEVEL_DEBUG1;
389 } else if (options.log_level < SYSLOG_LEVEL_DEBUG3) {
393 fatal("Too high debugging level.");
397 "%s, SSH protocols %d.%d/%d.%d, OpenSSL 0x%8.8lx\n",
399 PROTOCOL_MAJOR_1, PROTOCOL_MINOR_1,
400 PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2,
406 options.log_level = SYSLOG_LEVEL_QUIET;
409 if (optarg[0] == '^' && optarg[2] == 0 &&
410 (u_char) optarg[1] >= 64 &&
411 (u_char) optarg[1] < 128)
412 options.escape_char = (u_char) optarg[1] & 31;
413 else if (strlen(optarg) == 1)
414 options.escape_char = (u_char) optarg[0];
415 else if (strcmp(optarg, "none") == 0)
416 options.escape_char = SSH_ESCAPECHAR_NONE;
418 fprintf(stderr, "Bad escape character '%s'.\n",
424 if (ciphers_valid(optarg)) {
426 options.ciphers = xstrdup(optarg);
427 options.cipher = SSH_CIPHER_ILLEGAL;
430 options.cipher = cipher_number(optarg);
431 if (options.cipher == -1) {
433 "Unknown cipher type '%s'\n",
437 if (options.cipher == SSH_CIPHER_3DES)
438 options.ciphers = "3des-cbc";
439 else if (options.cipher == SSH_CIPHER_BLOWFISH)
440 options.ciphers = "blowfish-cbc";
442 options.ciphers = (char *)-1;
446 if (mac_valid(optarg))
447 options.macs = xstrdup(optarg);
449 fprintf(stderr, "Unknown mac type '%s'\n",
455 options.port = a2port(optarg);
456 if (options.port == 0) {
457 fprintf(stderr, "Bad port '%s'\n", optarg);
462 options.user = optarg;
465 if (sscanf(optarg, "%hu/%255[^/]/%hu", &fwd_port, buf,
466 &fwd_host_port) != 3 &&
467 sscanf(optarg, "%hu:%255[^:]:%hu", &fwd_port, buf,
468 &fwd_host_port) != 3) {
470 "Bad forwarding specification '%s'.\n",
475 add_remote_forward(&options, fwd_port, buf,
479 if (sscanf(optarg, "%hu/%255[^/]/%hu", &fwd_port, buf,
480 &fwd_host_port) != 3 &&
481 sscanf(optarg, "%hu:%255[^:]:%hu", &fwd_port, buf,
482 &fwd_host_port) != 3) {
484 "Bad forwarding specification '%s'.\n",
489 add_local_forward(&options, fwd_port, buf,
494 fwd_port = a2port(optarg);
496 fprintf(stderr, "Bad dynamic port '%s'\n",
500 add_local_forward(&options, fwd_port, "socks4", 0);
504 options.compression = 1;
515 if (process_config_line(&options, host ? host : "",
516 optarg, "command-line", 0, &dummy) != 0)
523 options.bind_address = optarg;
533 if (ac > 0 && !host && **av != '-') {
534 if (strchr(*av, '@')) {
537 if (cp == NULL || cp == p)
552 /* Check that we got a host name. */
556 SSLeay_add_all_algorithms();
557 ERR_load_crypto_strings();
559 /* Initialize the command to execute on remote host. */
560 buffer_init(&command);
563 * Save the command to execute on the remote host in a buffer. There
564 * is no limit on the length of the command, except by the maximum
565 * packet size. Also sets the tty flag if there is no command.
568 /* No command specified - execute shell on a tty. */
570 if (subsystem_flag) {
572 "You must specify a subsystem to invoke.\n");
576 /* A command has been specified. Store it into the buffer. */
577 for (i = 0; i < ac; i++) {
579 buffer_append(&command, " ", 1);
580 buffer_append(&command, av[i], strlen(av[i]));
584 /* Cannot fork to background if no command. */
585 if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag)
586 fatal("Cannot fork into background without a command to execute.");
588 /* Allocate a tty by default if no command specified. */
589 if (buffer_len(&command) == 0)
595 /* Do not allocate a tty if stdin is not a tty. */
596 if (!isatty(fileno(stdin)) && !force_tty_flag) {
598 log("Pseudo-terminal will not be allocated because stdin is not a terminal.");
603 * Initialize "log" output. Since we are the client all output
604 * actually goes to stderr.
606 log_init(av[0], options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level,
607 SYSLOG_FACILITY_USER, 1);
609 /* Read per-user configuration file. */
610 snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, _PATH_SSH_USER_CONFFILE);
611 read_config_file(buf, host, &options);
613 /* Read systemwide configuration file. */
614 read_config_file(_PATH_HOST_CONFIG_FILE, host, &options);
616 /* Fill configuration defaults. */
617 fill_default_options(&options);
620 log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 1);
624 if (options.user == NULL)
625 options.user = xstrdup(pw->pw_name);
627 if (options.hostname != NULL)
628 host = options.hostname;
630 /* Disable rhosts authentication if not running as root. */
632 /* Ignore uid if running under Windows */
633 if (!options.use_privileged_port) {
635 if (original_effective_uid != 0 || !options.use_privileged_port) {
637 debug("Rhosts Authentication disabled, "
638 "originating port will not be trusted.");
639 options.rhosts_authentication = 0;
642 * If using rsh has been selected, exec it now (without trying
643 * anything else). Note that we must release privileges first.
645 if (options.use_rsh) {
647 * Restore our superuser privileges. This must be done
648 * before permanently setting the uid.
652 /* Switch to the original uid permanently. */
653 permanently_set_uid(pw);
656 rsh_connect(host, options.user, &command);
657 fatal("rsh_connect returned");
659 /* Restore our superuser privileges. */
662 /* Open a connection to the remote host. */
664 cerr = ssh_connect(host, &hostaddr, options.port,
665 options.connection_attempts,
666 original_effective_uid != 0 || !options.use_privileged_port,
667 pw, options.proxy_command);
670 * If we successfully made the connection, load the host private key
671 * in case we will need it later for combined rsa-rhosts
672 * authentication. This must be done before releasing extra
673 * privileges, because the file is only readable by root.
675 sensitive_data.nkeys = 0;
676 sensitive_data.keys = NULL;
677 if (!cerr && (options.rhosts_rsa_authentication ||
678 options.hostbased_authentication)) {
679 sensitive_data.nkeys = 3;
680 sensitive_data.keys = xmalloc(sensitive_data.nkeys*sizeof(Key));
681 sensitive_data.keys[0] = key_load_private_type(KEY_RSA1,
682 _PATH_HOST_KEY_FILE, "", NULL);
683 sensitive_data.keys[1] = key_load_private_type(KEY_DSA,
684 _PATH_HOST_DSA_KEY_FILE, "", NULL);
685 sensitive_data.keys[2] = key_load_private_type(KEY_RSA,
686 _PATH_HOST_RSA_KEY_FILE, "", NULL);
689 * Get rid of any extra privileges that we may have. We will no
690 * longer need them. Also, extra privileges could make it very hard
691 * to read identity files and other non-world-readable files from the
692 * user's home directory if it happens to be on a NFS volume where
693 * root is mapped to nobody.
697 * Note that some legacy systems need to postpone the following call
698 * to permanently_set_uid() until the private hostkey is destroyed
699 * with RSA_free(). Otherwise the calling user could ptrace() the
700 * process, read the private hostkey and impersonate the host.
701 * OpenBSD does not allow ptracing of setuid processes.
703 permanently_set_uid(pw);
706 * Now that we are back to our own permissions, create ~/.ssh
707 * directory if it doesn\'t already exist.
709 snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, _PATH_SSH_USER_DIR);
710 if (stat(buf, &st) < 0)
711 if (mkdir(buf, 0700) < 0)
712 error("Could not create directory '%.200s'.", buf);
714 /* Check if the connection failed, and try "rsh" if appropriate. */
716 if (!options.fallback_to_rsh)
718 if (options.port != 0)
719 log("Secure connection to %.100s on port %hu refused; "
720 "reverting to insecure method",
723 log("Secure connection to %.100s refused; "
724 "reverting to insecure method.", host);
726 rsh_connect(host, options.user, &command);
727 fatal("rsh_connect returned");
729 /* load options.identity_files */
730 load_public_identity_files();
732 /* Expand ~ in known host file names. */
734 options.system_hostfile =
735 tilde_expand_filename(options.system_hostfile, original_real_uid);
736 options.user_hostfile =
737 tilde_expand_filename(options.user_hostfile, original_real_uid);
738 options.system_hostfile2 =
739 tilde_expand_filename(options.system_hostfile2, original_real_uid);
740 options.user_hostfile2 =
741 tilde_expand_filename(options.user_hostfile2, original_real_uid);
743 /* Log into the remote system. This never returns if the login fails. */
744 ssh_login(sensitive_data.keys, sensitive_data.nkeys,
745 host, (struct sockaddr *)&hostaddr, pw);
747 /* We no longer need the private host keys. Clear them now. */
748 if (sensitive_data.nkeys != 0) {
749 for (i = 0; i < sensitive_data.nkeys; i++) {
750 if (sensitive_data.keys[i] != NULL) {
751 /* Destroys contents safely */
752 debug3("clear hostkey %d", i);
753 key_free(sensitive_data.keys[i]);
754 sensitive_data.keys[i] = NULL;
757 xfree(sensitive_data.keys);
760 exit_status = compat20 ? ssh_session2() : ssh_session();
766 x11_get_proto(char *proto, int proto_len, char *data, int data_len)
772 if (options.xauth_location) {
773 /* Try to get Xauthority information for the display. */
774 snprintf(line, sizeof line, "%.100s list %.200s 2>" _PATH_DEVNULL,
775 options.xauth_location, getenv("DISPLAY"));
776 f = popen(line, "r");
777 if (f && fgets(line, sizeof(line), f) &&
778 sscanf(line, "%*s %s %s", proto, data) == 2)
784 * If we didn't get authentication data, just make up some
785 * data. The forwarding code will check the validity of the
786 * response anyway, and substitute this data. The X11
787 * server, however, will ignore this fake data and use
788 * whatever authentication mechanisms it was using otherwise
789 * for the local connection.
794 strlcpy(proto, "MIT-MAGIC-COOKIE-1", proto_len);
795 for (i = 0; i < 16; i++) {
798 snprintf(data + 2 * i, data_len - 2 * i, "%02x", rand & 0xff);
805 ssh_init_forwarding(void)
810 /* Initiate local TCP/IP port forwardings. */
811 for (i = 0; i < options.num_local_forwards; i++) {
812 debug("Connections to local port %d forwarded to remote address %.200s:%d",
813 options.local_forwards[i].port,
814 options.local_forwards[i].host,
815 options.local_forwards[i].host_port);
816 success += channel_request_local_forwarding(
817 options.local_forwards[i].port,
818 options.local_forwards[i].host,
819 options.local_forwards[i].host_port,
820 options.gateway_ports);
822 if (i > 0 && success == 0)
823 error("Could not request local forwarding.");
825 /* Initiate remote TCP/IP port forwardings. */
826 for (i = 0; i < options.num_remote_forwards; i++) {
827 debug("Connections to remote port %d forwarded to local address %.200s:%d",
828 options.remote_forwards[i].port,
829 options.remote_forwards[i].host,
830 options.remote_forwards[i].host_port);
831 channel_request_remote_forwarding(
832 options.remote_forwards[i].port,
833 options.remote_forwards[i].host,
834 options.remote_forwards[i].host_port);
839 check_agent_present(void)
841 if (options.forward_agent) {
842 /* Clear agent forwarding if we don\'t have an agent. */
843 int authfd = ssh_get_authentication_socket();
845 options.forward_agent = 0;
847 ssh_close_authentication_socket(authfd);
861 /* Enable compression if requested. */
862 if (options.compression) {
863 debug("Requesting compression at level %d.", options.compression_level);
865 if (options.compression_level < 1 || options.compression_level > 9)
866 fatal("Compression level must be from 1 (fast) to 9 (slow, best).");
868 /* Send the request. */
869 packet_start(SSH_CMSG_REQUEST_COMPRESSION);
870 packet_put_int(options.compression_level);
873 type = packet_read(&plen);
874 if (type == SSH_SMSG_SUCCESS)
875 packet_start_compression(options.compression_level);
876 else if (type == SSH_SMSG_FAILURE)
877 log("Warning: Remote host refused compression.");
879 packet_disconnect("Protocol error waiting for compression response.");
881 /* Allocate a pseudo tty if appropriate. */
883 debug("Requesting pty.");
885 /* Start the packet. */
886 packet_start(SSH_CMSG_REQUEST_PTY);
888 /* Store TERM in the packet. There is no limit on the
889 length of the string. */
893 packet_put_cstring(cp);
895 /* Store window size in the packet. */
896 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
897 memset(&ws, 0, sizeof(ws));
898 packet_put_int(ws.ws_row);
899 packet_put_int(ws.ws_col);
900 packet_put_int(ws.ws_xpixel);
901 packet_put_int(ws.ws_ypixel);
903 /* Store tty modes in the packet. */
904 tty_make_modes(fileno(stdin), NULL);
906 /* Send the packet, and wait for it to leave. */
910 /* Read response from the server. */
911 type = packet_read(&plen);
912 if (type == SSH_SMSG_SUCCESS) {
915 } else if (type == SSH_SMSG_FAILURE)
916 log("Warning: Remote host failed or refused to allocate a pseudo tty.");
918 packet_disconnect("Protocol error waiting for pty request response.");
920 /* Request X11 forwarding if enabled and DISPLAY is set. */
921 if (options.forward_x11 && getenv("DISPLAY") != NULL) {
922 char proto[512], data[512];
923 /* Get reasonable local authentication information. */
924 x11_get_proto(proto, sizeof proto, data, sizeof data);
925 /* Request forwarding with authentication spoofing. */
926 debug("Requesting X11 forwarding with authentication spoofing.");
927 x11_request_forwarding_with_spoofing(0, proto, data);
929 /* Read response from the server. */
930 type = packet_read(&plen);
931 if (type == SSH_SMSG_SUCCESS) {
933 } else if (type == SSH_SMSG_FAILURE) {
934 log("Warning: Remote host denied X11 forwarding.");
936 packet_disconnect("Protocol error waiting for X11 forwarding");
939 /* Tell the packet module whether this is an interactive session. */
940 packet_set_interactive(interactive);
942 /* Request authentication agent forwarding if appropriate. */
943 check_agent_present();
945 if (options.forward_agent) {
946 debug("Requesting authentication agent forwarding.");
947 auth_request_forwarding();
949 /* Read response from the server. */
950 type = packet_read(&plen);
951 packet_integrity_check(plen, 0, type);
952 if (type != SSH_SMSG_SUCCESS)
953 log("Warning: Remote host denied authentication agent forwarding.");
956 /* Initiate port forwardings. */
957 ssh_init_forwarding();
959 /* If requested, let ssh continue in the background. */
960 if (fork_after_authentication_flag)
961 if (daemon(1, 1) < 0)
962 fatal("daemon() failed: %.200s", strerror(errno));
965 * If a command was specified on the command line, execute the
966 * command now. Otherwise request the server to start a shell.
968 if (buffer_len(&command) > 0) {
969 int len = buffer_len(&command);
972 debug("Sending command: %.*s", len, buffer_ptr(&command));
973 packet_start(SSH_CMSG_EXEC_CMD);
974 packet_put_string(buffer_ptr(&command), buffer_len(&command));
978 debug("Requesting shell.");
979 packet_start(SSH_CMSG_EXEC_SHELL);
984 /* Enter the interactive session. */
985 return client_loop(have_tty, tty_flag ?
986 options.escape_char : SSH_ESCAPECHAR_NONE, 0);
990 client_subsystem_reply(int type, int plen, void *ctxt)
994 id = packet_get_int();
995 len = buffer_len(&command);
999 if (type == SSH2_MSG_CHANNEL_FAILURE)
1000 fatal("Request for subsystem '%.*s' failed on channel %d",
1001 len, buffer_ptr(&command), id);
1005 ssh_session2_callback(int id, void *arg)
1008 int interactive = 0;
1011 debug("client_init id %d arg %ld", id, (long)arg);
1016 cp = getenv("TERM");
1019 /* Store window size in the packet. */
1020 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
1021 memset(&ws, 0, sizeof(ws));
1023 channel_request_start(id, "pty-req", 0);
1024 packet_put_cstring(cp);
1025 packet_put_int(ws.ws_col);
1026 packet_put_int(ws.ws_row);
1027 packet_put_int(ws.ws_xpixel);
1028 packet_put_int(ws.ws_ypixel);
1029 tio = get_saved_tio();
1030 tty_make_modes(/*ignored*/ 0, &tio);
1033 /* XXX wait for reply */
1035 if (options.forward_x11 &&
1036 getenv("DISPLAY") != NULL) {
1037 char proto[512], data[512];
1038 /* Get reasonable local authentication information. */
1039 x11_get_proto(proto, sizeof proto, data, sizeof data);
1040 /* Request forwarding with authentication spoofing. */
1041 debug("Requesting X11 forwarding with authentication spoofing.");
1042 x11_request_forwarding_with_spoofing(id, proto, data);
1044 /* XXX wait for reply */
1047 check_agent_present();
1048 if (options.forward_agent) {
1049 debug("Requesting authentication agent forwarding.");
1050 channel_request_start(id, "auth-agent-req@openssh.com", 0);
1054 len = buffer_len(&command);
1058 if (subsystem_flag) {
1059 debug("Sending subsystem: %.*s", len, buffer_ptr(&command));
1060 channel_request_start(id, "subsystem", /*want reply*/ 1);
1061 /* register callback for reply */
1062 /* XXX we asume that client_loop has already been called */
1063 dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &client_subsystem_reply);
1064 dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &client_subsystem_reply);
1066 debug("Sending command: %.*s", len, buffer_ptr(&command));
1067 channel_request_start(id, "exec", 0);
1069 packet_put_string(buffer_ptr(&command), buffer_len(&command));
1072 channel_request(id, "shell", 0);
1074 /* channel_callback(id, SSH2_MSG_OPEN_CONFIGMATION, client_init, 0); */
1076 /* register different callback, etc. XXX */
1077 packet_set_interactive(interactive);
1081 ssh_session2_command(void)
1084 int window, packetmax, in, out, err;
1086 if (stdin_null_flag) {
1087 in = open(_PATH_DEVNULL, O_RDONLY);
1089 in = dup(STDIN_FILENO);
1091 out = dup(STDOUT_FILENO);
1092 err = dup(STDERR_FILENO);
1094 if (in < 0 || out < 0 || err < 0)
1095 fatal("dup() in/out/err failed");
1097 /* enable nonblocking unless tty */
1105 window = CHAN_SES_WINDOW_DEFAULT;
1106 packetmax = CHAN_SES_PACKET_DEFAULT;
1112 "session", SSH_CHANNEL_OPENING, in, out, err,
1113 window, packetmax, CHAN_EXTENDED_WRITE,
1114 xstrdup("client-session"), /*nonblock*/0);
1116 fatal("ssh_session2_command: channel_new failed");
1118 debug3("ssh_session2_command: channel_new: %d", c->self);
1120 channel_send_open(c->self);
1121 channel_register_callback(c->self, SSH2_MSG_CHANNEL_OPEN_CONFIRMATION,
1122 ssh_session2_callback, (void *)0);
1132 /* XXX should be pre-session */
1133 ssh_init_forwarding();
1135 id = no_shell_flag ? -1 : ssh_session2_command();
1137 /* If requested, let ssh continue in the background. */
1138 if (fork_after_authentication_flag)
1139 if (daemon(1, 1) < 0)
1140 fatal("daemon() failed: %.200s", strerror(errno));
1142 return client_loop(tty_flag, tty_flag ?
1143 options.escape_char : SSH_ESCAPECHAR_NONE, id);
1147 load_public_identity_files(void)
1154 if (options.smartcard_device >= 0 &&
1155 options.num_identity_files + 1 < SSH_MAX_IDENTITY_FILES &&
1156 (public = sc_get_key(options.smartcard_device)) != NULL ) {
1159 if (options.num_identity_files + 2 > SSH_MAX_IDENTITY_FILES)
1160 options.num_identity_files = SSH_MAX_IDENTITY_FILES - 2;
1161 memmove(&options.identity_files[2], &options.identity_files[0],
1162 sizeof(char *) * options.num_identity_files);
1163 options.num_identity_files += 2;
1166 /* XXX ssh1 vs ssh2 */
1167 new = key_new(KEY_RSA);
1168 new->flags = KEY_FLAG_EXT;
1169 BN_copy(new->rsa->n, public->rsa->n);
1170 BN_copy(new->rsa->e, public->rsa->e);
1171 RSA_set_method(new->rsa, sc_get_engine());
1172 options.identity_keys[0] = new;
1173 options.identity_files[0] = xstrdup("smartcard rsa key");;
1175 new = key_new(KEY_RSA1);
1176 new->flags = KEY_FLAG_EXT;
1177 BN_copy(new->rsa->n, public->rsa->n);
1178 BN_copy(new->rsa->e, public->rsa->e);
1179 RSA_set_method(new->rsa, sc_get_engine());
1180 options.identity_keys[1] = new;
1181 options.identity_files[1] = xstrdup("smartcard rsa1 key");
1186 for (; i < options.num_identity_files; i++) {
1187 filename = tilde_expand_filename(options.identity_files[i],
1189 public = key_load_public(filename, NULL);
1190 debug("identity file %s type %d", filename,
1191 public ? public->type : -1);
1192 xfree(options.identity_files[i]);
1193 options.identity_files[i] = filename;
1194 options.identity_keys[i] = public;