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 1.85 2001/01/29 12:36:10 djm 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"
68 #ifdef HAVE___PROGNAME
69 extern char *__progname;
74 /* Flag indicating whether IPv4 or IPv6. This can be set on the command line.
75 Default value is AF_UNSPEC means both IPv4 and IPv6. */
77 int IPv4or6 = AF_INET;
79 int IPv4or6 = AF_UNSPEC;
82 /* Flag indicating whether debug mode is on. This can be set on the command line. */
85 /* Flag indicating whether a tty should be allocated */
88 int force_tty_flag = 0;
90 /* don't exec a shell */
91 int no_shell_flag = 0;
94 * Flag indicating that nothing should be read from stdin. This can be set
95 * on the command line.
97 int stdin_null_flag = 0;
100 * Flag indicating that ssh should fork after authentication. This is useful
101 * so that the pasphrase can be entered manually, and then ssh goes to the
104 int fork_after_authentication_flag = 0;
107 * General data structure for command line options and options configurable
108 * in configuration files. See readconf.h.
113 * Name of the host we are connecting to. This is the name given on the
114 * command line, or the HostName specified for the user-supplied name in a
115 * configuration file.
119 /* socket address the host resolves to */
120 struct sockaddr_storage hostaddr;
123 * Flag to indicate that we have received a window change signal which has
124 * not yet been processed. This will cause a message indicating the new
125 * window size to be sent to the server a little later. This is volatile
126 * because this is updated in a signal handler.
128 volatile int received_window_change_signal = 0;
130 /* Flag indicating whether we have a valid host private key loaded. */
131 int host_private_key_loaded = 0;
133 /* Host private key. */
134 RSA *host_private_key = NULL;
136 /* Original real UID. */
137 uid_t original_real_uid;
139 /* command to be executed */
142 /* Should we execute a command or invoke a subsystem? */
143 int subsystem_flag = 0;
145 /* Prints a help message to the user. This function never returns. */
150 fprintf(stderr, "Usage: %s [options] host [command]\n", __progname);
151 fprintf(stderr, "Options:\n");
152 fprintf(stderr, " -l user Log in using this user name.\n");
153 fprintf(stderr, " -n Redirect input from /dev/null.\n");
154 fprintf(stderr, " -A Enable authentication agent forwarding.\n");
155 fprintf(stderr, " -a Disable authentication agent forwarding.\n");
157 fprintf(stderr, " -k Disable Kerberos ticket and AFS token forwarding.\n");
159 fprintf(stderr, " -X Enable X11 connection forwarding.\n");
160 fprintf(stderr, " -x Disable X11 connection forwarding.\n");
161 fprintf(stderr, " -i file Identity for RSA authentication (default: ~/.ssh/identity).\n");
162 fprintf(stderr, " -t Tty; allocate a tty even if command is given.\n");
163 fprintf(stderr, " -T Do not allocate a tty.\n");
164 fprintf(stderr, " -v Verbose; display verbose debugging messages.\n");
165 fprintf(stderr, " Multiple -v increases verbosity.\n");
166 fprintf(stderr, " -V Display version number only.\n");
167 fprintf(stderr, " -P Don't allocate a privileged port.\n");
168 fprintf(stderr, " -q Quiet; don't display any warning messages.\n");
169 fprintf(stderr, " -f Fork into background after authentication.\n");
170 fprintf(stderr, " -e char Set escape character; ``none'' = disable (default: ~).\n");
172 fprintf(stderr, " -c cipher Select encryption algorithm: "
175 fprintf(stderr, " -p port Connect to this port. Server must be on the same port.\n");
176 fprintf(stderr, " -L listen-port:host:port Forward local port to remote address\n");
177 fprintf(stderr, " -R listen-port:host:port Forward remote port to local address\n");
178 fprintf(stderr, " These cause %s to listen for connections on a port, and\n", __progname);
179 fprintf(stderr, " forward them to the other side by connecting to host:port.\n");
180 fprintf(stderr, " -C Enable compression.\n");
181 fprintf(stderr, " -N Do not execute a shell or command.\n");
182 fprintf(stderr, " -g Allow remote hosts to connect to forwarded ports.\n");
183 fprintf(stderr, " -4 Use IPv4 only.\n");
184 fprintf(stderr, " -6 Use IPv6 only.\n");
185 fprintf(stderr, " -2 Force protocol version 2.\n");
186 fprintf(stderr, " -o 'option' Process the option as if it was read from a configuration file.\n");
187 fprintf(stderr, " -s Invoke command (mandatory) as SSH2 subsystem.\n");
192 * Connects to the given host using rsh (or prints an error message and exits
193 * if rsh is not available). This function never returns.
196 rsh_connect(char *host, char *user, Buffer * command)
201 log("Using rsh. WARNING: Connection will not be encrypted.");
202 /* Build argument list for rsh. */
204 args[i++] = _PATH_RSH;
205 /* host may have to come after user on some systems */
211 if (buffer_len(command) > 0) {
212 buffer_append(command, "\0", 1);
213 args[i++] = buffer_ptr(command);
217 for (i = 0; args[i]; i++) {
219 fprintf(stderr, " ");
220 fprintf(stderr, "%s", args[i]);
222 fprintf(stderr, "\n");
224 execv(_PATH_RSH, args);
229 int ssh_session(void);
230 int ssh_session2(void);
231 int guess_identity_file_type(const char *filename);
234 * Main program for the ssh client.
237 main(int ac, char **av)
239 int i, opt, optind, exit_status, ok;
240 u_short fwd_port, fwd_host_port;
241 char *optarg, *cp, buf[256];
243 struct passwd *pw, pwcopy;
245 uid_t original_effective_uid;
247 __progname = get_progname(av[0]);
251 * Save the original real uid. It will be needed later (uid-swapping
252 * may clobber the real uid).
254 original_real_uid = getuid();
255 original_effective_uid = geteuid();
257 #ifdef HAVE_SETRLIMIT
258 /* If we are installed setuid root be careful to not drop core. */
259 if (original_real_uid != original_effective_uid) {
261 rlim.rlim_cur = rlim.rlim_max = 0;
262 if (setrlimit(RLIMIT_CORE, &rlim) < 0)
263 fatal("setrlimit failed: %.100s", strerror(errno));
267 * Use uid-swapping to give up root privileges for the duration of
268 * option processing. We will re-instantiate the rights when we are
269 * ready to create the privileged port, and will permanently drop
270 * them when the port has been created (actually, when the connection
271 * has been made, as we may need to create the port several times).
273 temporarily_use_uid(original_real_uid);
276 * Set our umask to something reasonable, as some files are created
277 * with the default umask. This will make them world-readable but
278 * writable only by the owner, which is ok for all files for which we
279 * don't set the modes explicitly.
283 /* Initialize option structure to indicate that no values have been set. */
284 initialize_options(&options);
286 /* Parse command-line arguments. */
289 /* If program name is not one of the standard names, use it as host name. */
292 if (strcasecmp(cp, "rsh") && strcasecmp(cp, "ssh") &&
293 strcasecmp(cp, "rlogin") && strcasecmp(cp, "slogin") &&
294 strcasecmp(cp, "remsh") &&
295 strcasecmp(cp, "rsh.exe") && strcasecmp(cp, "ssh.exe") &&
296 strcasecmp(cp, "rlogin.exe") && strcasecmp(cp, "slogin.exe") &&
297 strcasecmp(cp, "remsh.exe"))
299 if (strcmp(cp, "rsh") && strcmp(cp, "ssh") && strcmp(cp, "rlogin") &&
300 strcmp(cp, "slogin") && strcmp(cp, "remsh"))
304 for (optind = 1; optind < ac; optind++) {
305 if (av[optind][0] != '-') {
308 if ((cp = strchr(av[optind], '@'))) {
311 options.user = av[optind];
321 if (strchr("eilcpLRo", opt)) { /* options with arguments */
322 optarg = av[optind] + 2;
323 if (strcmp(optarg, "") == 0) {
324 if (optind >= ac - 1)
326 optarg = av[++optind];
335 options.protocol = SSH_PROTO_2;
347 fork_after_authentication_flag = 1;
351 options.forward_x11 = 0;
354 options.forward_x11 = 1;
357 options.gateway_ports = 1;
360 options.use_privileged_port = 0;
363 options.forward_agent = 0;
366 options.forward_agent = 1;
370 options.kerberos_tgt_passing = 0;
371 options.afs_token_passing = 0;
375 if (stat(optarg, &st) < 0) {
376 fprintf(stderr, "Warning: Identity file %s does not exist.\n",
380 if (options.num_identity_files >= SSH_MAX_IDENTITY_FILES)
381 fatal("Too many identity files specified (max %d)",
382 SSH_MAX_IDENTITY_FILES);
383 options.identity_files[options.num_identity_files++] = xstrdup(optarg);
391 if (0 == debug_flag) {
393 options.log_level = SYSLOG_LEVEL_DEBUG1;
394 } else if (options.log_level < SYSLOG_LEVEL_DEBUG3) {
398 fatal("Too high debugging level.\n");
402 fprintf(stderr, "SSH Version %s, protocol versions %d.%d/%d.%d.\n",
404 PROTOCOL_MAJOR_1, PROTOCOL_MINOR_1,
405 PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2);
406 fprintf(stderr, "Compiled with SSL (0x%8.8lx).\n", SSLeay());
411 options.log_level = SYSLOG_LEVEL_QUIET;
414 if (optarg[0] == '^' && optarg[2] == 0 &&
415 (u_char) optarg[1] >= 64 && (u_char) optarg[1] < 128)
416 options.escape_char = (u_char) optarg[1] & 31;
417 else if (strlen(optarg) == 1)
418 options.escape_char = (u_char) optarg[0];
419 else if (strcmp(optarg, "none") == 0)
420 options.escape_char = -2;
422 fprintf(stderr, "Bad escape character '%s'.\n", optarg);
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) {
435 fprintf(stderr, "Unknown cipher type '%s'\n", optarg);
438 if (options.cipher == SSH_CIPHER_3DES) {
439 options.ciphers = "3des-cbc";
440 } else if (options.cipher == SSH_CIPHER_BLOWFISH) {
441 options.ciphers = "blowfish-cbc";
443 options.ciphers = (char *)-1;
448 options.port = atoi(optarg);
451 options.user = optarg;
454 if (sscanf(optarg, "%hu/%255[^/]/%hu", &fwd_port, buf,
455 &fwd_host_port) != 3 &&
456 sscanf(optarg, "%hu:%255[^:]:%hu", &fwd_port, buf,
457 &fwd_host_port) != 3) {
458 fprintf(stderr, "Bad forwarding specification '%s'.\n", optarg);
462 add_remote_forward(&options, fwd_port, buf, fwd_host_port);
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) {
469 fprintf(stderr, "Bad forwarding specification '%s'.\n", optarg);
473 add_local_forward(&options, fwd_port, buf, fwd_host_port);
476 options.compression = 1;
487 if (process_config_line(&options, host ? host : "", optarg,
488 "command-line", 0, &dummy) != 0)
499 /* Check that we got a host name. */
503 SSLeay_add_all_algorithms();
504 ERR_load_crypto_strings();
506 /* Initialize the command to execute on remote host. */
507 buffer_init(&command);
510 * Save the command to execute on the remote host in a buffer. There
511 * is no limit on the length of the command, except by the maximum
512 * packet size. Also sets the tty flag if there is no command.
515 /* No command specified - execute shell on a tty. */
517 if (subsystem_flag) {
518 fprintf(stderr, "You must specify a subsystem to invoke.");
522 /* A command has been specified. Store it into the
524 for (i = optind; i < ac; i++) {
526 buffer_append(&command, " ", 1);
527 buffer_append(&command, av[i], strlen(av[i]));
531 /* Cannot fork to background if no command. */
532 if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag)
533 fatal("Cannot fork into background without a command to execute.");
535 /* Allocate a tty by default if no command specified. */
536 if (buffer_len(&command) == 0)
542 /* Do not allocate a tty if stdin is not a tty. */
543 if (!isatty(fileno(stdin)) && !force_tty_flag) {
545 log("Pseudo-terminal will not be allocated because stdin is not a terminal.\n");
550 pw = getpwuid(original_real_uid);
552 log("You don't exist, go away!\n");
555 /* Take a copy of the returned structure. */
556 memset(&pwcopy, 0, sizeof(pwcopy));
557 pwcopy.pw_name = xstrdup(pw->pw_name);
558 pwcopy.pw_passwd = xstrdup(pw->pw_passwd);
559 pwcopy.pw_uid = pw->pw_uid;
560 pwcopy.pw_gid = pw->pw_gid;
561 #ifdef HAVE_PW_CLASS_IN_PASSWD
562 pwcopy.pw_class = xstrdup(pw->pw_class);
564 pwcopy.pw_dir = xstrdup(pw->pw_dir);
565 pwcopy.pw_shell = xstrdup(pw->pw_shell);
568 /* Initialize "log" output. Since we are the client all output
569 actually goes to the terminal. */
570 log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 0);
572 /* Read per-user configuration file. */
573 snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, _PATH_SSH_USER_CONFFILE);
574 read_config_file(buf, host, &options);
576 /* Read systemwide configuration file. */
577 read_config_file(_PATH_HOST_CONFIG_FILE, host, &options);
579 /* Fill configuration defaults. */
580 fill_default_options(&options);
583 log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 0);
585 if (options.user == NULL)
586 options.user = xstrdup(pw->pw_name);
588 if (options.hostname != NULL)
589 host = options.hostname;
591 /* Disable rhosts authentication if not running as root. */
593 /* Ignore uid if running under Windows */
594 if (!options.use_privileged_port) {
596 if (original_effective_uid != 0 || !options.use_privileged_port) {
598 debug("Rhosts Authentication disabled, "
599 "originating port will not be trusted.");
600 options.rhosts_authentication = 0;
603 * If using rsh has been selected, exec it now (without trying
604 * anything else). Note that we must release privileges first.
606 if (options.use_rsh) {
608 * Restore our superuser privileges. This must be done
609 * before permanently setting the uid.
613 /* Switch to the original uid permanently. */
614 permanently_set_uid(original_real_uid);
617 rsh_connect(host, options.user, &command);
618 fatal("rsh_connect returned");
620 /* Restore our superuser privileges. */
623 /* Open a connection to the remote host. */
625 ok = ssh_connect(host, &hostaddr, options.port,
626 options.connection_attempts,
627 original_effective_uid != 0 || !options.use_privileged_port,
629 options.proxy_command);
632 * If we successfully made the connection, load the host private key
633 * in case we will need it later for combined rsa-rhosts
634 * authentication. This must be done before releasing extra
635 * privileges, because the file is only readable by root.
637 if (ok && (options.protocol & SSH_PROTO_1)) {
639 host_private_key = RSA_new();
641 k.rsa = host_private_key;
642 if (load_private_key(_PATH_HOST_KEY_FILE, "", &k, NULL))
643 host_private_key_loaded = 1;
646 * Get rid of any extra privileges that we may have. We will no
647 * longer need them. Also, extra privileges could make it very hard
648 * to read identity files and other non-world-readable files from the
649 * user's home directory if it happens to be on a NFS volume where
650 * root is mapped to nobody.
654 * Note that some legacy systems need to postpone the following call
655 * to permanently_set_uid() until the private hostkey is destroyed
656 * with RSA_free(). Otherwise the calling user could ptrace() the
657 * process, read the private hostkey and impersonate the host.
658 * OpenBSD does not allow ptracing of setuid processes.
660 permanently_set_uid(original_real_uid);
663 * Now that we are back to our own permissions, create ~/.ssh
664 * directory if it doesn\'t already exist.
666 snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, _PATH_SSH_USER_DIR);
667 if (stat(buf, &st) < 0)
668 if (mkdir(buf, 0700) < 0)
669 error("Could not create directory '%.200s'.", buf);
671 /* Check if the connection failed, and try "rsh" if appropriate. */
673 if (options.port != 0)
674 log("Secure connection to %.100s on port %hu refused%.100s.",
676 options.fallback_to_rsh ? "; reverting to insecure method" : "");
678 log("Secure connection to %.100s refused%.100s.", host,
679 options.fallback_to_rsh ? "; reverting to insecure method" : "");
681 if (options.fallback_to_rsh) {
682 rsh_connect(host, options.user, &command);
683 fatal("rsh_connect returned");
687 /* Expand ~ in options.identity_files, known host file names. */
689 for (i = 0; i < options.num_identity_files; i++) {
690 options.identity_files[i] =
691 tilde_expand_filename(options.identity_files[i], original_real_uid);
692 options.identity_files_type[i] = guess_identity_file_type(options.identity_files[i]);
693 debug("identity file %s type %d", options.identity_files[i],
694 options.identity_files_type[i]);
696 options.system_hostfile =
697 tilde_expand_filename(options.system_hostfile, original_real_uid);
698 options.user_hostfile =
699 tilde_expand_filename(options.user_hostfile, original_real_uid);
700 options.system_hostfile2 =
701 tilde_expand_filename(options.system_hostfile2, original_real_uid);
702 options.user_hostfile2 =
703 tilde_expand_filename(options.user_hostfile2, original_real_uid);
705 /* Log into the remote system. This never returns if the login fails. */
706 ssh_login(host_private_key_loaded, host_private_key,
707 host, (struct sockaddr *)&hostaddr, original_real_uid);
709 /* We no longer need the host private key. Clear it now. */
710 if (host_private_key_loaded)
711 RSA_free(host_private_key); /* Destroys contents safely */
713 exit_status = compat20 ? ssh_session2() : ssh_session();
719 x11_get_proto(char *proto, int proto_len, char *data, int data_len)
725 if (options.xauth_location) {
726 /* Try to get Xauthority information for the display. */
727 snprintf(line, sizeof line, "%.100s list %.200s 2>/dev/null",
728 options.xauth_location, getenv("DISPLAY"));
729 f = popen(line, "r");
730 if (f && fgets(line, sizeof(line), f) &&
731 sscanf(line, "%*s %s %s", proto, data) == 2)
737 * If we didn't get authentication data, just make up some
738 * data. The forwarding code will check the validity of the
739 * response anyway, and substitute this data. The X11
740 * server, however, will ignore this fake data and use
741 * whatever authentication mechanisms it was using otherwise
742 * for the local connection.
747 strlcpy(proto, "MIT-MAGIC-COOKIE-1", proto_len);
748 for (i = 0; i < 16; i++) {
751 snprintf(data + 2 * i, data_len - 2 * i, "%02x", rand & 0xff);
758 ssh_init_forwarding(void)
761 /* Initiate local TCP/IP port forwardings. */
762 for (i = 0; i < options.num_local_forwards; i++) {
763 debug("Connections to local port %d forwarded to remote address %.200s:%d",
764 options.local_forwards[i].port,
765 options.local_forwards[i].host,
766 options.local_forwards[i].host_port);
767 channel_request_local_forwarding(
768 options.local_forwards[i].port,
769 options.local_forwards[i].host,
770 options.local_forwards[i].host_port,
771 options.gateway_ports);
774 /* Initiate remote TCP/IP port forwardings. */
775 for (i = 0; i < options.num_remote_forwards; i++) {
776 debug("Connections to remote port %d forwarded to local address %.200s:%d",
777 options.remote_forwards[i].port,
778 options.remote_forwards[i].host,
779 options.remote_forwards[i].host_port);
780 channel_request_remote_forwarding(
781 options.remote_forwards[i].port,
782 options.remote_forwards[i].host,
783 options.remote_forwards[i].host_port);
788 check_agent_present(void)
790 if (options.forward_agent) {
791 /* Clear agent forwarding if we don\'t have an agent. */
792 int authfd = ssh_get_authentication_socket();
794 options.forward_agent = 0;
796 ssh_close_authentication_socket(authfd);
810 /* Enable compression if requested. */
811 if (options.compression) {
812 debug("Requesting compression at level %d.", options.compression_level);
814 if (options.compression_level < 1 || options.compression_level > 9)
815 fatal("Compression level must be from 1 (fast) to 9 (slow, best).");
817 /* Send the request. */
818 packet_start(SSH_CMSG_REQUEST_COMPRESSION);
819 packet_put_int(options.compression_level);
822 type = packet_read(&plen);
823 if (type == SSH_SMSG_SUCCESS)
824 packet_start_compression(options.compression_level);
825 else if (type == SSH_SMSG_FAILURE)
826 log("Warning: Remote host refused compression.");
828 packet_disconnect("Protocol error waiting for compression response.");
830 /* Allocate a pseudo tty if appropriate. */
832 debug("Requesting pty.");
834 /* Start the packet. */
835 packet_start(SSH_CMSG_REQUEST_PTY);
837 /* Store TERM in the packet. There is no limit on the
838 length of the string. */
842 packet_put_string(cp, strlen(cp));
844 /* Store window size in the packet. */
845 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
846 memset(&ws, 0, sizeof(ws));
847 packet_put_int(ws.ws_row);
848 packet_put_int(ws.ws_col);
849 packet_put_int(ws.ws_xpixel);
850 packet_put_int(ws.ws_ypixel);
852 /* Store tty modes in the packet. */
853 tty_make_modes(fileno(stdin));
855 /* Send the packet, and wait for it to leave. */
859 /* Read response from the server. */
860 type = packet_read(&plen);
861 if (type == SSH_SMSG_SUCCESS) {
864 } else if (type == SSH_SMSG_FAILURE)
865 log("Warning: Remote host failed or refused to allocate a pseudo tty.");
867 packet_disconnect("Protocol error waiting for pty request response.");
869 /* Request X11 forwarding if enabled and DISPLAY is set. */
870 if (options.forward_x11 && getenv("DISPLAY") != NULL) {
871 char proto[512], data[512];
872 /* Get reasonable local authentication information. */
873 x11_get_proto(proto, sizeof proto, data, sizeof data);
874 /* Request forwarding with authentication spoofing. */
875 debug("Requesting X11 forwarding with authentication spoofing.");
876 x11_request_forwarding_with_spoofing(0, proto, data);
878 /* Read response from the server. */
879 type = packet_read(&plen);
880 if (type == SSH_SMSG_SUCCESS) {
882 } else if (type == SSH_SMSG_FAILURE) {
883 log("Warning: Remote host denied X11 forwarding.");
885 packet_disconnect("Protocol error waiting for X11 forwarding");
888 /* Tell the packet module whether this is an interactive session. */
889 packet_set_interactive(interactive);
891 /* Request authentication agent forwarding if appropriate. */
892 check_agent_present();
894 if (options.forward_agent) {
895 debug("Requesting authentication agent forwarding.");
896 auth_request_forwarding();
898 /* Read response from the server. */
899 type = packet_read(&plen);
900 packet_integrity_check(plen, 0, type);
901 if (type != SSH_SMSG_SUCCESS)
902 log("Warning: Remote host denied authentication agent forwarding.");
905 /* Initiate port forwardings. */
906 ssh_init_forwarding();
908 /* If requested, let ssh continue in the background. */
909 if (fork_after_authentication_flag)
910 if (daemon(1, 1) < 0)
911 fatal("daemon() failed: %.200s", strerror(errno));
914 * If a command was specified on the command line, execute the
915 * command now. Otherwise request the server to start a shell.
917 if (buffer_len(&command) > 0) {
918 int len = buffer_len(&command);
921 debug("Sending command: %.*s", len, buffer_ptr(&command));
922 packet_start(SSH_CMSG_EXEC_CMD);
923 packet_put_string(buffer_ptr(&command), buffer_len(&command));
927 debug("Requesting shell.");
928 packet_start(SSH_CMSG_EXEC_SHELL);
933 /* Enter the interactive session. */
934 return client_loop(have_tty, tty_flag ? options.escape_char : -1, 0);
938 ssh_session2_callback(int id, void *arg)
943 debug("client_init id %d arg %d", id, (int)arg);
954 /* Store window size in the packet. */
955 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
956 memset(&ws, 0, sizeof(ws));
958 channel_request_start(id, "pty-req", 0);
959 packet_put_cstring(cp);
960 packet_put_int(ws.ws_col);
961 packet_put_int(ws.ws_row);
962 packet_put_int(ws.ws_xpixel);
963 packet_put_int(ws.ws_ypixel);
964 packet_put_cstring(""); /* XXX: encode terminal modes */
967 /* XXX wait for reply */
969 if (options.forward_x11 &&
970 getenv("DISPLAY") != NULL) {
971 char proto[512], data[512];
972 /* Get reasonable local authentication information. */
973 x11_get_proto(proto, sizeof proto, data, sizeof data);
974 /* Request forwarding with authentication spoofing. */
975 debug("Requesting X11 forwarding with authentication spoofing.");
976 x11_request_forwarding_with_spoofing(id, proto, data);
978 /* XXX wait for reply */
981 check_agent_present();
982 if (options.forward_agent) {
983 debug("Requesting authentication agent forwarding.");
984 channel_request_start(id, "auth-agent-req@openssh.com", 0);
988 len = buffer_len(&command);
992 if (subsystem_flag) {
993 debug("Sending subsystem: %.*s", len, buffer_ptr(&command));
994 channel_request_start(id, "subsystem", 0);
996 debug("Sending command: %.*s", len, buffer_ptr(&command));
997 channel_request_start(id, "exec", 0);
999 packet_put_string(buffer_ptr(&command), len);
1002 channel_request(id, "shell", 0);
1004 /* channel_callback(id, SSH2_MSG_OPEN_CONFIGMATION, client_init, 0); */
1006 /* register different callback, etc. XXX */
1007 packet_set_interactive(interactive);
1008 clientloop_set_session_ident(id);
1014 int window, packetmax, id;
1017 if (stdin_null_flag) {
1018 in = open("/dev/null", O_RDONLY);
1020 in = dup(STDIN_FILENO);
1022 out = dup(STDOUT_FILENO);
1023 err = dup(STDERR_FILENO);
1025 if (in < 0 || out < 0 || err < 0)
1026 fatal("dup() in/out/err failed");
1028 /* enable nonblocking unless tty */
1036 /* XXX should be pre-session */
1037 ssh_init_forwarding();
1039 /* If requested, let ssh continue in the background. */
1040 if (fork_after_authentication_flag)
1041 if (daemon(1, 1) < 0)
1042 fatal("daemon() failed: %.200s", strerror(errno));
1044 window = CHAN_SES_WINDOW_DEFAULT;
1045 packetmax = CHAN_SES_PACKET_DEFAULT;
1051 "session", SSH_CHANNEL_OPENING, in, out, err,
1052 window, packetmax, CHAN_EXTENDED_WRITE,
1053 xstrdup("client-session"), /*nonblock*/0);
1056 channel_register_callback(id, SSH2_MSG_CHANNEL_OPEN_CONFIRMATION,
1057 ssh_session2_callback, (void *)0);
1059 return client_loop(tty_flag, tty_flag ? options.escape_char : -1, id);
1063 guess_identity_file_type(const char *filename)
1067 int type = KEY_RSA1; /* default */
1069 if (stat(filename, &st) < 0) {
1070 /* ignore this key */
1073 public = key_new(type);
1074 if (!load_public_key(filename, public, NULL)) {
1075 /* ok, so we will assume this is 'some' key */