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 1.79 2000/12/27 11:51:54 markus Exp $");
44 #include <openssl/evp.h>
45 #include <openssl/dsa.h>
46 #include <openssl/rsa.h>
47 #include <openssl/err.h>
63 #ifdef HAVE___PROGNAME
64 extern char *__progname;
69 /* Flag indicating whether IPv4 or IPv6. This can be set on the command line.
70 Default value is AF_UNSPEC means both IPv4 and IPv6. */
72 int IPv4or6 = AF_INET;
74 int IPv4or6 = AF_UNSPEC;
77 /* Flag indicating whether debug mode is on. This can be set on the command line. */
80 /* Flag indicating whether a tty should be allocated */
83 int force_tty_flag = 0;
85 /* don't exec a shell */
86 int no_shell_flag = 0;
89 * Flag indicating that nothing should be read from stdin. This can be set
90 * on the command line.
92 int stdin_null_flag = 0;
95 * Flag indicating that ssh should fork after authentication. This is useful
96 * so that the pasphrase can be entered manually, and then ssh goes to the
99 int fork_after_authentication_flag = 0;
102 * General data structure for command line options and options configurable
103 * in configuration files. See readconf.h.
108 * Name of the host we are connecting to. This is the name given on the
109 * command line, or the HostName specified for the user-supplied name in a
110 * configuration file.
114 /* socket address the host resolves to */
115 struct sockaddr_storage hostaddr;
118 * Flag to indicate that we have received a window change signal which has
119 * not yet been processed. This will cause a message indicating the new
120 * window size to be sent to the server a little later. This is volatile
121 * because this is updated in a signal handler.
123 volatile int received_window_change_signal = 0;
125 /* Flag indicating whether we have a valid host private key loaded. */
126 int host_private_key_loaded = 0;
128 /* Host private key. */
129 RSA *host_private_key = NULL;
131 /* Original real UID. */
132 uid_t original_real_uid;
134 /* command to be executed */
137 /* Prints a help message to the user. This function never returns. */
142 fprintf(stderr, "Usage: %s [options] host [command]\n", __progname);
143 fprintf(stderr, "Options:\n");
144 fprintf(stderr, " -l user Log in using this user name.\n");
145 fprintf(stderr, " -n Redirect input from /dev/null.\n");
146 fprintf(stderr, " -A Enable authentication agent forwarding.\n");
147 fprintf(stderr, " -a Disable authentication agent forwarding.\n");
149 fprintf(stderr, " -k Disable Kerberos ticket and AFS token forwarding.\n");
151 fprintf(stderr, " -X Enable X11 connection forwarding.\n");
152 fprintf(stderr, " -x Disable X11 connection forwarding.\n");
153 fprintf(stderr, " -i file Identity for RSA authentication (default: ~/.ssh/identity).\n");
154 fprintf(stderr, " -t Tty; allocate a tty even if command is given.\n");
155 fprintf(stderr, " -T Do not allocate a tty.\n");
156 fprintf(stderr, " -v Verbose; display verbose debugging messages.\n");
157 fprintf(stderr, " Multiple -v increases verbosity.\n");
158 fprintf(stderr, " -V Display version number only.\n");
159 fprintf(stderr, " -P Don't allocate a privileged port.\n");
160 fprintf(stderr, " -q Quiet; don't display any warning messages.\n");
161 fprintf(stderr, " -f Fork into background after authentication.\n");
162 fprintf(stderr, " -e char Set escape character; ``none'' = disable (default: ~).\n");
164 fprintf(stderr, " -c cipher Select encryption algorithm: "
167 fprintf(stderr, " -p port Connect to this port. Server must be on the same port.\n");
168 fprintf(stderr, " -L listen-port:host:port Forward local port to remote address\n");
169 fprintf(stderr, " -R listen-port:host:port Forward remote port to local address\n");
170 fprintf(stderr, " These cause %s to listen for connections on a port, and\n", __progname);
171 fprintf(stderr, " forward them to the other side by connecting to host:port.\n");
172 fprintf(stderr, " -C Enable compression.\n");
173 fprintf(stderr, " -N Do not execute a shell or command.\n");
174 fprintf(stderr, " -g Allow remote hosts to connect to forwarded ports.\n");
175 fprintf(stderr, " -4 Use IPv4 only.\n");
176 fprintf(stderr, " -6 Use IPv6 only.\n");
177 fprintf(stderr, " -2 Force protocol version 2.\n");
178 fprintf(stderr, " -o 'option' Process the option as if it was read from a configuration file.\n");
183 * Connects to the given host using rsh (or prints an error message and exits
184 * if rsh is not available). This function never returns.
187 rsh_connect(char *host, char *user, Buffer * command)
192 log("Using rsh. WARNING: Connection will not be encrypted.");
193 /* Build argument list for rsh. */
195 args[i++] = _PATH_RSH;
196 /* host may have to come after user on some systems */
202 if (buffer_len(command) > 0) {
203 buffer_append(command, "\0", 1);
204 args[i++] = buffer_ptr(command);
208 for (i = 0; args[i]; i++) {
210 fprintf(stderr, " ");
211 fprintf(stderr, "%s", args[i]);
213 fprintf(stderr, "\n");
215 execv(_PATH_RSH, args);
220 int ssh_session(void);
221 int ssh_session2(void);
222 int guess_identity_file_type(const char *filename);
225 * Main program for the ssh client.
228 main(int ac, char **av)
230 int i, opt, optind, exit_status, ok;
231 u_short fwd_port, fwd_host_port;
232 char *optarg, *cp, buf[256];
234 struct passwd *pw, pwcopy;
236 uid_t original_effective_uid;
238 __progname = get_progname(av[0]);
242 * Save the original real uid. It will be needed later (uid-swapping
243 * may clobber the real uid).
245 original_real_uid = getuid();
246 original_effective_uid = geteuid();
248 #ifdef HAVE_SETRLIMIT
249 /* If we are installed setuid root be careful to not drop core. */
250 if (original_real_uid != original_effective_uid) {
252 rlim.rlim_cur = rlim.rlim_max = 0;
253 if (setrlimit(RLIMIT_CORE, &rlim) < 0)
254 fatal("setrlimit failed: %.100s", strerror(errno));
258 * Use uid-swapping to give up root privileges for the duration of
259 * option processing. We will re-instantiate the rights when we are
260 * ready to create the privileged port, and will permanently drop
261 * them when the port has been created (actually, when the connection
262 * has been made, as we may need to create the port several times).
264 temporarily_use_uid(original_real_uid);
267 * Set our umask to something reasonable, as some files are created
268 * with the default umask. This will make them world-readable but
269 * writable only by the owner, which is ok for all files for which we
270 * don't set the modes explicitly.
274 /* Initialize option structure to indicate that no values have been set. */
275 initialize_options(&options);
277 /* Parse command-line arguments. */
280 /* If program name is not one of the standard names, use it as host name. */
283 if (strcasecmp(cp, "rsh") && strcasecmp(cp, "ssh") &&
284 strcasecmp(cp, "rlogin") && strcasecmp(cp, "slogin") &&
285 strcasecmp(cp, "remsh") &&
286 strcasecmp(cp, "rsh.exe") && strcasecmp(cp, "ssh.exe") &&
287 strcasecmp(cp, "rlogin.exe") && strcasecmp(cp, "slogin.exe") &&
288 strcasecmp(cp, "remsh.exe"))
290 if (strcmp(cp, "rsh") && strcmp(cp, "ssh") && strcmp(cp, "rlogin") &&
291 strcmp(cp, "slogin") && strcmp(cp, "remsh"))
295 for (optind = 1; optind < ac; optind++) {
296 if (av[optind][0] != '-') {
299 if ((cp = strchr(av[optind], '@'))) {
302 options.user = av[optind];
312 if (strchr("eilcpLRo", opt)) { /* options with arguments */
313 optarg = av[optind] + 2;
314 if (strcmp(optarg, "") == 0) {
315 if (optind >= ac - 1)
317 optarg = av[++optind];
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 does not exist.\n",
371 if (options.num_identity_files >= SSH_MAX_IDENTITY_FILES)
372 fatal("Too many identity files specified (max %d)",
373 SSH_MAX_IDENTITY_FILES);
374 options.identity_files[options.num_identity_files++] = xstrdup(optarg);
382 if (0 == debug_flag) {
384 options.log_level = SYSLOG_LEVEL_DEBUG1;
385 } else if (options.log_level < SYSLOG_LEVEL_DEBUG3) {
389 fatal("Too high debugging level.\n");
393 fprintf(stderr, "SSH Version %s, protocol versions %d.%d/%d.%d.\n",
395 PROTOCOL_MAJOR_1, PROTOCOL_MINOR_1,
396 PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2);
397 fprintf(stderr, "Compiled with SSL (0x%8.8lx).\n", SSLeay());
402 options.log_level = SYSLOG_LEVEL_QUIET;
405 if (optarg[0] == '^' && optarg[2] == 0 &&
406 (u_char) optarg[1] >= 64 && (u_char) optarg[1] < 128)
407 options.escape_char = (u_char) optarg[1] & 31;
408 else if (strlen(optarg) == 1)
409 options.escape_char = (u_char) optarg[0];
410 else if (strcmp(optarg, "none") == 0)
411 options.escape_char = -2;
413 fprintf(stderr, "Bad escape character '%s'.\n", optarg);
418 if (ciphers_valid(optarg)) {
420 options.ciphers = xstrdup(optarg);
421 options.cipher = SSH_CIPHER_ILLEGAL;
424 options.cipher = cipher_number(optarg);
425 if (options.cipher == -1) {
426 fprintf(stderr, "Unknown cipher type '%s'\n", optarg);
429 if (options.cipher == SSH_CIPHER_3DES) {
430 options.ciphers = "3des-cbc";
431 } else if (options.cipher == SSH_CIPHER_BLOWFISH) {
432 options.ciphers = "blowfish-cbc";
434 options.ciphers = (char *)-1;
439 options.port = atoi(optarg);
442 options.user = optarg;
445 if (sscanf(optarg, "%hu/%255[^/]/%hu", &fwd_port, buf,
446 &fwd_host_port) != 3 &&
447 sscanf(optarg, "%hu:%255[^:]:%hu", &fwd_port, buf,
448 &fwd_host_port) != 3) {
449 fprintf(stderr, "Bad forwarding specification '%s'.\n", optarg);
453 add_remote_forward(&options, fwd_port, buf, fwd_host_port);
456 if (sscanf(optarg, "%hu/%255[^/]/%hu", &fwd_port, buf,
457 &fwd_host_port) != 3 &&
458 sscanf(optarg, "%hu:%255[^:]:%hu", &fwd_port, buf,
459 &fwd_host_port) != 3) {
460 fprintf(stderr, "Bad forwarding specification '%s'.\n", optarg);
464 add_local_forward(&options, fwd_port, buf, fwd_host_port);
467 options.compression = 1;
478 if (process_config_line(&options, host ? host : "", optarg,
479 "command-line", 0, &dummy) != 0)
487 /* Check that we got a host name. */
491 SSLeay_add_all_algorithms();
492 ERR_load_crypto_strings();
494 /* Initialize the command to execute on remote host. */
495 buffer_init(&command);
498 * Save the command to execute on the remote host in a buffer. There
499 * is no limit on the length of the command, except by the maximum
500 * packet size. Also sets the tty flag if there is no command.
503 /* No command specified - execute shell on a tty. */
506 /* A command has been specified. Store it into the
508 for (i = optind; i < ac; i++) {
510 buffer_append(&command, " ", 1);
511 buffer_append(&command, av[i], strlen(av[i]));
515 /* Cannot fork to background if no command. */
516 if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag)
517 fatal("Cannot fork into background without a command to execute.");
519 /* Allocate a tty by default if no command specified. */
520 if (buffer_len(&command) == 0)
526 /* Do not allocate a tty if stdin is not a tty. */
527 if (!isatty(fileno(stdin)) && !force_tty_flag) {
529 fprintf(stderr, "Pseudo-terminal will not be allocated because stdin is not a terminal.\n");
534 pw = getpwuid(original_real_uid);
536 fprintf(stderr, "You don't exist, go away!\n");
539 /* Take a copy of the returned structure. */
540 memset(&pwcopy, 0, sizeof(pwcopy));
541 pwcopy.pw_name = xstrdup(pw->pw_name);
542 pwcopy.pw_passwd = xstrdup(pw->pw_passwd);
543 pwcopy.pw_uid = pw->pw_uid;
544 pwcopy.pw_gid = pw->pw_gid;
545 #ifdef HAVE_PW_CLASS_IN_PASSWD
546 pwcopy.pw_class = xstrdup(pw->pw_class);
548 pwcopy.pw_dir = xstrdup(pw->pw_dir);
549 pwcopy.pw_shell = xstrdup(pw->pw_shell);
552 /* Initialize "log" output. Since we are the client all output
553 actually goes to the terminal. */
554 log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 0);
556 /* Read per-user configuration file. */
557 snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, SSH_USER_CONFFILE);
558 read_config_file(buf, host, &options);
560 /* Read systemwide configuration file. */
561 read_config_file(HOST_CONFIG_FILE, host, &options);
563 /* Fill configuration defaults. */
564 fill_default_options(&options);
567 log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 0);
569 if (options.user == NULL)
570 options.user = xstrdup(pw->pw_name);
572 if (options.hostname != NULL)
573 host = options.hostname;
575 /* Disable rhosts authentication if not running as root. */
577 /* Ignore uid if running under Windows */
578 if (!options.use_privileged_port) {
580 if (original_effective_uid != 0 || !options.use_privileged_port) {
582 debug("Rhosts Authentication disabled, "
583 "originating port will not be trusted.");
584 options.rhosts_authentication = 0;
587 * If using rsh has been selected, exec it now (without trying
588 * anything else). Note that we must release privileges first.
590 if (options.use_rsh) {
592 * Restore our superuser privileges. This must be done
593 * before permanently setting the uid.
597 /* Switch to the original uid permanently. */
598 permanently_set_uid(original_real_uid);
601 rsh_connect(host, options.user, &command);
602 fatal("rsh_connect returned");
604 /* Restore our superuser privileges. */
607 /* Open a connection to the remote host. */
609 ok = ssh_connect(host, &hostaddr, options.port,
610 options.connection_attempts,
611 original_effective_uid != 0 || !options.use_privileged_port,
613 options.proxy_command);
616 * If we successfully made the connection, load the host private key
617 * in case we will need it later for combined rsa-rhosts
618 * authentication. This must be done before releasing extra
619 * privileges, because the file is only readable by root.
621 if (ok && (options.protocol & SSH_PROTO_1)) {
623 host_private_key = RSA_new();
625 k.rsa = host_private_key;
626 if (load_private_key(HOST_KEY_FILE, "", &k, NULL))
627 host_private_key_loaded = 1;
630 * Get rid of any extra privileges that we may have. We will no
631 * longer need them. Also, extra privileges could make it very hard
632 * to read identity files and other non-world-readable files from the
633 * user's home directory if it happens to be on a NFS volume where
634 * root is mapped to nobody.
638 * Note that some legacy systems need to postpone the following call
639 * to permanently_set_uid() until the private hostkey is destroyed
640 * with RSA_free(). Otherwise the calling user could ptrace() the
641 * process, read the private hostkey and impersonate the host.
642 * OpenBSD does not allow ptracing of setuid processes.
644 permanently_set_uid(original_real_uid);
647 * Now that we are back to our own permissions, create ~/.ssh
648 * directory if it doesn\'t already exist.
650 snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, SSH_USER_DIR);
651 if (stat(buf, &st) < 0)
652 if (mkdir(buf, 0700) < 0)
653 error("Could not create directory '%.200s'.", buf);
655 /* Check if the connection failed, and try "rsh" if appropriate. */
657 if (options.port != 0)
658 log("Secure connection to %.100s on port %hu refused%.100s.",
660 options.fallback_to_rsh ? "; reverting to insecure method" : "");
662 log("Secure connection to %.100s refused%.100s.", host,
663 options.fallback_to_rsh ? "; reverting to insecure method" : "");
665 if (options.fallback_to_rsh) {
666 rsh_connect(host, options.user, &command);
667 fatal("rsh_connect returned");
671 /* Expand ~ in options.identity_files, known host file names. */
673 for (i = 0; i < options.num_identity_files; i++) {
674 options.identity_files[i] =
675 tilde_expand_filename(options.identity_files[i], original_real_uid);
676 options.identity_files_type[i] = guess_identity_file_type(options.identity_files[i]);
677 debug("identity file %s type %d", options.identity_files[i],
678 options.identity_files_type[i]);
680 options.system_hostfile =
681 tilde_expand_filename(options.system_hostfile, original_real_uid);
682 options.user_hostfile =
683 tilde_expand_filename(options.user_hostfile, original_real_uid);
684 options.system_hostfile2 =
685 tilde_expand_filename(options.system_hostfile2, original_real_uid);
686 options.user_hostfile2 =
687 tilde_expand_filename(options.user_hostfile2, original_real_uid);
689 /* Log into the remote system. This never returns if the login fails. */
690 ssh_login(host_private_key_loaded, host_private_key,
691 host, (struct sockaddr *)&hostaddr, original_real_uid);
693 /* We no longer need the host private key. Clear it now. */
694 if (host_private_key_loaded)
695 RSA_free(host_private_key); /* Destroys contents safely */
697 exit_status = compat20 ? ssh_session2() : ssh_session();
703 x11_get_proto(char *proto, int proto_len, char *data, int data_len)
709 if (options.xauth_location) {
710 /* Try to get Xauthority information for the display. */
711 snprintf(line, sizeof line, "%.100s list %.200s 2>/dev/null",
712 options.xauth_location, getenv("DISPLAY"));
713 f = popen(line, "r");
714 if (f && fgets(line, sizeof(line), f) &&
715 sscanf(line, "%*s %s %s", proto, data) == 2)
721 * If we didn't get authentication data, just make up some
722 * data. The forwarding code will check the validity of the
723 * response anyway, and substitute this data. The X11
724 * server, however, will ignore this fake data and use
725 * whatever authentication mechanisms it was using otherwise
726 * for the local connection.
731 strlcpy(proto, "MIT-MAGIC-COOKIE-1", proto_len);
732 for (i = 0; i < 16; i++) {
735 snprintf(data + 2 * i, data_len - 2 * i, "%02x", rand & 0xff);
742 ssh_init_forwarding(void)
745 /* Initiate local TCP/IP port forwardings. */
746 for (i = 0; i < options.num_local_forwards; i++) {
747 debug("Connections to local port %d forwarded to remote address %.200s:%d",
748 options.local_forwards[i].port,
749 options.local_forwards[i].host,
750 options.local_forwards[i].host_port);
751 channel_request_local_forwarding(
752 options.local_forwards[i].port,
753 options.local_forwards[i].host,
754 options.local_forwards[i].host_port,
755 options.gateway_ports);
758 /* Initiate remote TCP/IP port forwardings. */
759 for (i = 0; i < options.num_remote_forwards; i++) {
760 debug("Connections to remote port %d forwarded to local address %.200s:%d",
761 options.remote_forwards[i].port,
762 options.remote_forwards[i].host,
763 options.remote_forwards[i].host_port);
764 channel_request_remote_forwarding(
765 options.remote_forwards[i].port,
766 options.remote_forwards[i].host,
767 options.remote_forwards[i].host_port);
772 check_agent_present(void)
774 if (options.forward_agent) {
775 /* Clear agent forwarding if we don\'t have an agent. */
776 int authfd = ssh_get_authentication_socket();
778 options.forward_agent = 0;
780 ssh_close_authentication_socket(authfd);
794 /* Enable compression if requested. */
795 if (options.compression) {
796 debug("Requesting compression at level %d.", options.compression_level);
798 if (options.compression_level < 1 || options.compression_level > 9)
799 fatal("Compression level must be from 1 (fast) to 9 (slow, best).");
801 /* Send the request. */
802 packet_start(SSH_CMSG_REQUEST_COMPRESSION);
803 packet_put_int(options.compression_level);
806 type = packet_read(&plen);
807 if (type == SSH_SMSG_SUCCESS)
808 packet_start_compression(options.compression_level);
809 else if (type == SSH_SMSG_FAILURE)
810 log("Warning: Remote host refused compression.");
812 packet_disconnect("Protocol error waiting for compression response.");
814 /* Allocate a pseudo tty if appropriate. */
816 debug("Requesting pty.");
818 /* Start the packet. */
819 packet_start(SSH_CMSG_REQUEST_PTY);
821 /* Store TERM in the packet. There is no limit on the
822 length of the string. */
826 packet_put_string(cp, strlen(cp));
828 /* Store window size in the packet. */
829 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
830 memset(&ws, 0, sizeof(ws));
831 packet_put_int(ws.ws_row);
832 packet_put_int(ws.ws_col);
833 packet_put_int(ws.ws_xpixel);
834 packet_put_int(ws.ws_ypixel);
836 /* Store tty modes in the packet. */
837 tty_make_modes(fileno(stdin));
839 /* Send the packet, and wait for it to leave. */
843 /* Read response from the server. */
844 type = packet_read(&plen);
845 if (type == SSH_SMSG_SUCCESS) {
848 } else if (type == SSH_SMSG_FAILURE)
849 log("Warning: Remote host failed or refused to allocate a pseudo tty.");
851 packet_disconnect("Protocol error waiting for pty request response.");
853 /* Request X11 forwarding if enabled and DISPLAY is set. */
854 if (options.forward_x11 && getenv("DISPLAY") != NULL) {
855 char proto[512], data[512];
856 /* Get reasonable local authentication information. */
857 x11_get_proto(proto, sizeof proto, data, sizeof data);
858 /* Request forwarding with authentication spoofing. */
859 debug("Requesting X11 forwarding with authentication spoofing.");
860 x11_request_forwarding_with_spoofing(0, proto, data);
862 /* Read response from the server. */
863 type = packet_read(&plen);
864 if (type == SSH_SMSG_SUCCESS) {
866 } else if (type == SSH_SMSG_FAILURE) {
867 log("Warning: Remote host denied X11 forwarding.");
869 packet_disconnect("Protocol error waiting for X11 forwarding");
872 /* Tell the packet module whether this is an interactive session. */
873 packet_set_interactive(interactive, options.keepalives);
876 /* Request authentication agent forwarding if appropriate. */
877 check_agent_present();
879 if (options.forward_agent) {
880 debug("Requesting authentication agent forwarding.");
881 auth_request_forwarding();
883 /* Read response from the server. */
884 type = packet_read(&plen);
885 packet_integrity_check(plen, 0, type);
886 if (type != SSH_SMSG_SUCCESS)
887 log("Warning: Remote host denied authentication agent forwarding.");
890 /* Initiate port forwardings. */
891 ssh_init_forwarding();
893 /* If requested, let ssh continue in the background. */
894 if (fork_after_authentication_flag)
895 if (daemon(1, 1) < 0)
896 fatal("daemon() failed: %.200s", strerror(errno));
899 * If a command was specified on the command line, execute the
900 * command now. Otherwise request the server to start a shell.
902 if (buffer_len(&command) > 0) {
903 int len = buffer_len(&command);
906 debug("Sending command: %.*s", len, buffer_ptr(&command));
907 packet_start(SSH_CMSG_EXEC_CMD);
908 packet_put_string(buffer_ptr(&command), buffer_len(&command));
912 debug("Requesting shell.");
913 packet_start(SSH_CMSG_EXEC_SHELL);
918 /* Enter the interactive session. */
919 return client_loop(have_tty, tty_flag ? options.escape_char : -1, 0);
922 extern void client_set_session_ident(int id);
925 ssh_session2_callback(int id, void *arg)
928 debug("client_init id %d arg %d", id, (int)arg);
939 /* Store window size in the packet. */
940 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
941 memset(&ws, 0, sizeof(ws));
943 channel_request_start(id, "pty-req", 0);
944 packet_put_cstring(cp);
945 packet_put_int(ws.ws_col);
946 packet_put_int(ws.ws_row);
947 packet_put_int(ws.ws_xpixel);
948 packet_put_int(ws.ws_ypixel);
949 packet_put_cstring(""); /* XXX: encode terminal modes */
951 /* XXX wait for reply */
953 if (options.forward_x11 &&
954 getenv("DISPLAY") != NULL) {
955 char proto[512], data[512];
956 /* Get reasonable local authentication information. */
957 x11_get_proto(proto, sizeof proto, data, sizeof data);
958 /* Request forwarding with authentication spoofing. */
959 debug("Requesting X11 forwarding with authentication spoofing.");
960 x11_request_forwarding_with_spoofing(id, proto, data);
961 /* XXX wait for reply */
964 check_agent_present();
965 if (options.forward_agent) {
966 debug("Requesting authentication agent forwarding.");
967 channel_request_start(id, "auth-agent-req@openssh.com", 0);
971 len = buffer_len(&command);
975 debug("Sending command: %.*s", len, buffer_ptr(&command));
976 channel_request_start(id, "exec", 0);
977 packet_put_string(buffer_ptr(&command), len);
980 channel_request(id, "shell", 0);
982 /* channel_callback(id, SSH2_MSG_OPEN_CONFIGMATION, client_init, 0); */
984 /* register different callback, etc. XXX */
985 client_set_session_ident(id);
991 int window, packetmax, id;
994 if (stdin_null_flag) {
995 in = open("/dev/null", O_RDONLY);
997 in = dup(STDIN_FILENO);
999 out = dup(STDOUT_FILENO);
1000 err = dup(STDERR_FILENO);
1002 if (in < 0 || out < 0 || err < 0)
1003 fatal("dup() in/out/err failed");
1005 /* enable nonblocking unless tty */
1013 /* XXX should be pre-session */
1014 ssh_init_forwarding();
1016 /* If requested, let ssh continue in the background. */
1017 if (fork_after_authentication_flag)
1018 if (daemon(1, 1) < 0)
1019 fatal("daemon() failed: %.200s", strerror(errno));
1021 window = CHAN_SES_WINDOW_DEFAULT;
1022 packetmax = CHAN_SES_PACKET_DEFAULT;
1028 "session", SSH_CHANNEL_OPENING, in, out, err,
1029 window, packetmax, CHAN_EXTENDED_WRITE,
1030 xstrdup("client-session"), /*nonblock*/0);
1033 channel_register_callback(id, SSH2_MSG_CHANNEL_OPEN_CONFIRMATION,
1034 ssh_session2_callback, (void *)0);
1036 return client_loop(tty_flag, tty_flag ? options.escape_char : -1, id);
1040 guess_identity_file_type(const char *filename)
1044 int type = KEY_RSA1; /* default */
1046 if (stat(filename, &st) < 0) {
1047 /* ignore this key */
1050 public = key_new(type);
1051 if (!load_public_key(filename, public, NULL)) {
1052 /* ok, so we will assume this is 'some' key */