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 1.165 2002/03/19 10:49:35 markus Exp $");
44 #include <openssl/evp.h>
45 #include <openssl/err.h>
60 #include "pathnames.h"
61 #include "clientloop.h"
64 #include "sshconnect.h"
65 #include "tildexpand.h"
73 #include <openssl/engine.h>
77 #ifdef HAVE___PROGNAME
78 extern char *__progname;
83 /* Flag indicating whether IPv4 or IPv6. This can be set on the command line.
84 Default value is AF_UNSPEC means both IPv4 and IPv6. */
86 int IPv4or6 = AF_INET;
88 int IPv4or6 = AF_UNSPEC;
91 /* Flag indicating whether debug mode is on. This can be set on the command line. */
94 /* Flag indicating whether a tty should be allocated */
97 int force_tty_flag = 0;
99 /* don't exec a shell */
100 int no_shell_flag = 0;
103 * Flag indicating that nothing should be read from stdin. This can be set
104 * on the command line.
106 int stdin_null_flag = 0;
109 * Flag indicating that ssh should fork after authentication. This is useful
110 * so that the pasphrase can be entered manually, and then ssh goes to the
113 int fork_after_authentication_flag = 0;
116 * General data structure for command line options and options configurable
117 * in configuration files. See readconf.h.
121 /* optional user configfile */
125 * Name of the host we are connecting to. This is the name given on the
126 * command line, or the HostName specified for the user-supplied name in a
127 * configuration file.
131 /* socket address the host resolves to */
132 struct sockaddr_storage hostaddr;
134 /* Private host keys. */
140 /* Original real UID. */
141 uid_t original_real_uid;
143 /* command to be executed */
146 /* Should we execute a command or invoke a subsystem? */
147 int subsystem_flag = 0;
149 /* Prints a help message to the user. This function never returns. */
154 fprintf(stderr, "Usage: %s [options] host [command]\n", __progname);
155 fprintf(stderr, "Options:\n");
156 fprintf(stderr, " -l user Log in using this user name.\n");
157 fprintf(stderr, " -n Redirect input from " _PATH_DEVNULL ".\n");
158 fprintf(stderr, " -F config Config file (default: ~/%s).\n",
159 _PATH_SSH_USER_CONFFILE);
160 fprintf(stderr, " -A Enable authentication agent forwarding.\n");
161 fprintf(stderr, " -a Disable authentication agent forwarding (default).\n");
163 fprintf(stderr, " -k Disable Kerberos ticket and AFS token forwarding.\n");
165 fprintf(stderr, " -X Enable X11 connection forwarding.\n");
166 fprintf(stderr, " -x Disable X11 connection forwarding (default).\n");
167 fprintf(stderr, " -i file Identity for public key authentication "
168 "(default: ~/.ssh/identity)\n");
170 fprintf(stderr, " -I reader Set smartcard reader.\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, " -D port Enable dynamic application-level port forwarding.\n");
190 fprintf(stderr, " -C Enable compression.\n");
191 fprintf(stderr, " -N Do not execute a shell or command.\n");
192 fprintf(stderr, " -g Allow remote hosts to connect to forwarded ports.\n");
193 fprintf(stderr, " -1 Force protocol version 1.\n");
194 fprintf(stderr, " -2 Force protocol version 2.\n");
195 fprintf(stderr, " -4 Use IPv4 only.\n");
196 fprintf(stderr, " -6 Use IPv6 only.\n");
197 fprintf(stderr, " -o 'option' Process the option as if it was read from a configuration file.\n");
198 fprintf(stderr, " -s Invoke command (mandatory) as SSH2 subsystem.\n");
199 fprintf(stderr, " -b addr Local IP address.\n");
204 * Connects to the given host using rsh (or prints an error message and exits
205 * if rsh is not available). This function never returns.
208 rsh_connect(char *host, char *user, Buffer * command)
213 log("Using rsh. WARNING: Connection will not be encrypted.");
214 /* Build argument list for rsh. */
216 args[i++] = _PATH_RSH;
217 /* host may have to come after user on some systems */
223 if (buffer_len(command) > 0) {
224 buffer_append(command, "\0", 1);
225 args[i++] = buffer_ptr(command);
229 for (i = 0; args[i]; i++) {
231 fprintf(stderr, " ");
232 fprintf(stderr, "%s", args[i]);
234 fprintf(stderr, "\n");
236 execv(_PATH_RSH, args);
241 static int ssh_session(void);
242 static int ssh_session2(void);
243 static void load_public_identity_files(void);
246 * Main program for the ssh client.
249 main(int ac, char **av)
251 int i, opt, exit_status, cerr;
252 u_short fwd_port, fwd_host_port;
253 char sfwd_port[6], sfwd_host_port[6];
254 char *p, *cp, buf[256];
258 uid_t original_effective_uid;
259 extern int optind, optreset;
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:F: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 = xstrdup(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;
467 if (sscanf(optarg, "%5[0-9]:%255[^:]:%5[0-9]",
468 sfwd_port, buf, sfwd_host_port) != 3 &&
469 sscanf(optarg, "%5[0-9]/%255[^/]/%5[0-9]",
470 sfwd_port, buf, sfwd_host_port) != 3) {
472 "Bad forwarding specification '%s'\n",
477 if ((fwd_port = a2port(sfwd_port)) == 0 ||
478 (fwd_host_port = a2port(sfwd_host_port)) == 0) {
480 "Bad forwarding port(s) '%s'\n", optarg);
484 add_local_forward(&options, fwd_port, buf,
487 add_remote_forward(&options, fwd_port, buf,
492 fwd_port = a2port(optarg);
494 fprintf(stderr, "Bad dynamic port '%s'\n",
498 add_local_forward(&options, fwd_port, "socks4", 0);
502 options.compression = 1;
513 if (process_config_line(&options, host ? host : "",
514 optarg, "command-line", 0, &dummy) != 0)
521 options.bind_address = optarg;
534 if (ac > 0 && !host && **av != '-') {
535 if (strchr(*av, '@')) {
538 if (cp == NULL || cp == p)
553 /* Check that we got a host name. */
557 SSLeay_add_all_algorithms();
558 ERR_load_crypto_strings();
559 channel_set_af(IPv4or6);
561 /* Initialize the command to execute on remote host. */
562 buffer_init(&command);
565 * Save the command to execute on the remote host in a buffer. There
566 * is no limit on the length of the command, except by the maximum
567 * packet size. Also sets the tty flag if there is no command.
570 /* No command specified - execute shell on a tty. */
572 if (subsystem_flag) {
574 "You must specify a subsystem to invoke.\n");
578 /* A command has been specified. Store it into the buffer. */
579 for (i = 0; i < ac; i++) {
581 buffer_append(&command, " ", 1);
582 buffer_append(&command, av[i], strlen(av[i]));
586 /* Cannot fork to background if no command. */
587 if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag)
588 fatal("Cannot fork into background without a command to execute.");
590 /* Allocate a tty by default if no command specified. */
591 if (buffer_len(&command) == 0)
597 /* Do not allocate a tty if stdin is not a tty. */
598 if (!isatty(fileno(stdin)) && !force_tty_flag) {
600 log("Pseudo-terminal will not be allocated because stdin is not a terminal.");
605 * Initialize "log" output. Since we are the client all output
606 * actually goes to stderr.
608 log_init(av[0], options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level,
609 SYSLOG_FACILITY_USER, 1);
612 * Read per-user configuration file. Ignore the system wide config
613 * file if the user specifies a config file on the command line.
615 if (config != NULL) {
616 if (!read_config_file(config, host, &options))
617 fatal("Can't open user config file %.100s: "
618 "%.100s", config, strerror(errno));
620 snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir,
621 _PATH_SSH_USER_CONFFILE);
622 (void)read_config_file(buf, host, &options);
624 /* Read systemwide configuration file after use config. */
625 (void)read_config_file(_PATH_HOST_CONFIG_FILE, host, &options);
628 /* Fill configuration defaults. */
629 fill_default_options(&options);
632 log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 1);
636 if (options.user == NULL)
637 options.user = xstrdup(pw->pw_name);
639 if (options.hostname != NULL)
640 host = options.hostname;
642 /* Disable rhosts authentication if not running as root. */
644 /* Ignore uid if running under Windows */
645 if (!options.use_privileged_port) {
647 if (original_effective_uid != 0 || !options.use_privileged_port) {
649 debug("Rhosts Authentication disabled, "
650 "originating port will not be trusted.");
651 options.rhosts_authentication = 0;
654 * If using rsh has been selected, exec it now (without trying
655 * anything else). Note that we must release privileges first.
657 if (options.use_rsh) {
659 * Restore our superuser privileges. This must be done
660 * before permanently setting the uid.
664 /* Switch to the original uid permanently. */
665 permanently_set_uid(pw);
668 rsh_connect(host, options.user, &command);
669 fatal("rsh_connect returned");
671 /* Restore our superuser privileges. */
674 /* Open a connection to the remote host. */
676 cerr = ssh_connect(host, &hostaddr, options.port, IPv4or6,
677 options.connection_attempts,
678 original_effective_uid != 0 || !options.use_privileged_port,
679 pw, options.proxy_command);
682 * If we successfully made the connection, load the host private key
683 * in case we will need it later for combined rsa-rhosts
684 * authentication. This must be done before releasing extra
685 * privileges, because the file is only readable by root.
687 sensitive_data.nkeys = 0;
688 sensitive_data.keys = NULL;
689 if (!cerr && (options.rhosts_rsa_authentication ||
690 options.hostbased_authentication)) {
691 sensitive_data.nkeys = 3;
692 sensitive_data.keys = xmalloc(sensitive_data.nkeys*sizeof(Key));
693 sensitive_data.keys[0] = key_load_private_type(KEY_RSA1,
694 _PATH_HOST_KEY_FILE, "", NULL);
695 sensitive_data.keys[1] = key_load_private_type(KEY_DSA,
696 _PATH_HOST_DSA_KEY_FILE, "", NULL);
697 sensitive_data.keys[2] = key_load_private_type(KEY_RSA,
698 _PATH_HOST_RSA_KEY_FILE, "", NULL);
701 * Get rid of any extra privileges that we may have. We will no
702 * longer need them. Also, extra privileges could make it very hard
703 * to read identity files and other non-world-readable files from the
704 * user's home directory if it happens to be on a NFS volume where
705 * root is mapped to nobody.
709 * Note that some legacy systems need to postpone the following call
710 * to permanently_set_uid() until the private hostkey is destroyed
711 * with RSA_free(). Otherwise the calling user could ptrace() the
712 * process, read the private hostkey and impersonate the host.
713 * OpenBSD does not allow ptracing of setuid processes.
715 permanently_set_uid(pw);
718 * Now that we are back to our own permissions, create ~/.ssh
719 * directory if it doesn\'t already exist.
721 snprintf(buf, sizeof buf, "%.100s%s%.100s", pw->pw_dir, strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR);
722 if (stat(buf, &st) < 0)
723 if (mkdir(buf, 0700) < 0)
724 error("Could not create directory '%.200s'.", buf);
726 /* Check if the connection failed, and try "rsh" if appropriate. */
728 if (!options.fallback_to_rsh)
730 if (options.port != 0)
731 log("Secure connection to %.100s on port %hu refused; "
732 "reverting to insecure method",
735 log("Secure connection to %.100s refused; "
736 "reverting to insecure method.", host);
738 rsh_connect(host, options.user, &command);
739 fatal("rsh_connect returned");
741 /* load options.identity_files */
742 load_public_identity_files();
744 /* Expand ~ in known host file names. */
746 options.system_hostfile =
747 tilde_expand_filename(options.system_hostfile, original_real_uid);
748 options.user_hostfile =
749 tilde_expand_filename(options.user_hostfile, original_real_uid);
750 options.system_hostfile2 =
751 tilde_expand_filename(options.system_hostfile2, original_real_uid);
752 options.user_hostfile2 =
753 tilde_expand_filename(options.user_hostfile2, original_real_uid);
755 signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
757 /* Log into the remote system. This never returns if the login fails. */
758 ssh_login(sensitive_data.keys, sensitive_data.nkeys,
759 host, (struct sockaddr *)&hostaddr, pw);
761 /* We no longer need the private host keys. Clear them now. */
762 if (sensitive_data.nkeys != 0) {
763 for (i = 0; i < sensitive_data.nkeys; i++) {
764 if (sensitive_data.keys[i] != NULL) {
765 /* Destroys contents safely */
766 debug3("clear hostkey %d", i);
767 key_free(sensitive_data.keys[i]);
768 sensitive_data.keys[i] = NULL;
771 xfree(sensitive_data.keys);
773 for (i = 0; i < options.num_identity_files; i++) {
774 if (options.identity_files[i]) {
775 xfree(options.identity_files[i]);
776 options.identity_files[i] = NULL;
778 if (options.identity_keys[i]) {
779 key_free(options.identity_keys[i]);
780 options.identity_keys[i] = NULL;
784 exit_status = compat20 ? ssh_session2() : ssh_session();
790 x11_get_proto(char **_proto, char **_data)
793 static char proto[512], data[512];
800 proto[0] = data[0] = '\0';
801 if (options.xauth_location && (display = getenv("DISPLAY"))) {
802 /* Try to get Xauthority information for the display. */
803 if (strncmp(display, "localhost:", 10) == 0)
805 * Handle FamilyLocal case where $DISPLAY does
806 * not match an authorization entry. For this we
807 * just try "xauth list unix:displaynum.screennum".
808 * XXX: "localhost" match to determine FamilyLocal
811 snprintf(line, sizeof line, "%.100s list unix:%s 2>"
812 _PATH_DEVNULL, options.xauth_location, display+10);
814 snprintf(line, sizeof line, "%.100s list %.200s 2>"
815 _PATH_DEVNULL, options.xauth_location, display);
816 debug2("x11_get_proto %s", line);
817 f = popen(line, "r");
818 if (f && fgets(line, sizeof(line), f) &&
819 sscanf(line, "%*s %511s %511s", proto, data) == 2)
825 * If we didn't get authentication data, just make up some
826 * data. The forwarding code will check the validity of the
827 * response anyway, and substitute this data. The X11
828 * server, however, will ignore this fake data and use
829 * whatever authentication mechanisms it was using otherwise
830 * for the local connection.
835 strlcpy(proto, "MIT-MAGIC-COOKIE-1", sizeof proto);
836 for (i = 0; i < 16; i++) {
839 snprintf(data + 2 * i, sizeof data - 2 * i, "%02x", rand & 0xff);
846 ssh_init_forwarding(void)
851 /* Initiate local TCP/IP port forwardings. */
852 for (i = 0; i < options.num_local_forwards; i++) {
853 debug("Connections to local port %d forwarded to remote address %.200s:%d",
854 options.local_forwards[i].port,
855 options.local_forwards[i].host,
856 options.local_forwards[i].host_port);
857 success += channel_setup_local_fwd_listener(
858 options.local_forwards[i].port,
859 options.local_forwards[i].host,
860 options.local_forwards[i].host_port,
861 options.gateway_ports);
863 if (i > 0 && success == 0)
864 error("Could not request local forwarding.");
866 /* Initiate remote TCP/IP port forwardings. */
867 for (i = 0; i < options.num_remote_forwards; i++) {
868 debug("Connections to remote port %d forwarded to local address %.200s:%d",
869 options.remote_forwards[i].port,
870 options.remote_forwards[i].host,
871 options.remote_forwards[i].host_port);
872 channel_request_remote_forwarding(
873 options.remote_forwards[i].port,
874 options.remote_forwards[i].host,
875 options.remote_forwards[i].host_port);
880 check_agent_present(void)
882 if (options.forward_agent) {
883 /* Clear agent forwarding if we don\'t have an agent. */
884 int authfd = ssh_get_authentication_socket();
886 options.forward_agent = 0;
888 ssh_close_authentication_socket(authfd);
901 /* Enable compression if requested. */
902 if (options.compression) {
903 debug("Requesting compression at level %d.", options.compression_level);
905 if (options.compression_level < 1 || options.compression_level > 9)
906 fatal("Compression level must be from 1 (fast) to 9 (slow, best).");
908 /* Send the request. */
909 packet_start(SSH_CMSG_REQUEST_COMPRESSION);
910 packet_put_int(options.compression_level);
913 type = packet_read();
914 if (type == SSH_SMSG_SUCCESS)
915 packet_start_compression(options.compression_level);
916 else if (type == SSH_SMSG_FAILURE)
917 log("Warning: Remote host refused compression.");
919 packet_disconnect("Protocol error waiting for compression response.");
921 /* Allocate a pseudo tty if appropriate. */
923 debug("Requesting pty.");
925 /* Start the packet. */
926 packet_start(SSH_CMSG_REQUEST_PTY);
928 /* Store TERM in the packet. There is no limit on the
929 length of the string. */
933 packet_put_cstring(cp);
935 /* Store window size in the packet. */
936 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
937 memset(&ws, 0, sizeof(ws));
938 packet_put_int(ws.ws_row);
939 packet_put_int(ws.ws_col);
940 packet_put_int(ws.ws_xpixel);
941 packet_put_int(ws.ws_ypixel);
943 /* Store tty modes in the packet. */
944 tty_make_modes(fileno(stdin), NULL);
946 /* Send the packet, and wait for it to leave. */
950 /* Read response from the server. */
951 type = packet_read();
952 if (type == SSH_SMSG_SUCCESS) {
955 } else if (type == SSH_SMSG_FAILURE)
956 log("Warning: Remote host failed or refused to allocate a pseudo tty.");
958 packet_disconnect("Protocol error waiting for pty request response.");
960 /* Request X11 forwarding if enabled and DISPLAY is set. */
961 if (options.forward_x11 && getenv("DISPLAY") != NULL) {
963 /* Get reasonable local authentication information. */
964 x11_get_proto(&proto, &data);
965 /* Request forwarding with authentication spoofing. */
966 debug("Requesting X11 forwarding with authentication spoofing.");
967 x11_request_forwarding_with_spoofing(0, proto, data);
969 /* Read response from the server. */
970 type = packet_read();
971 if (type == SSH_SMSG_SUCCESS) {
973 } else if (type == SSH_SMSG_FAILURE) {
974 log("Warning: Remote host denied X11 forwarding.");
976 packet_disconnect("Protocol error waiting for X11 forwarding");
979 /* Tell the packet module whether this is an interactive session. */
980 packet_set_interactive(interactive);
982 /* Request authentication agent forwarding if appropriate. */
983 check_agent_present();
985 if (options.forward_agent) {
986 debug("Requesting authentication agent forwarding.");
987 auth_request_forwarding();
989 /* Read response from the server. */
990 type = packet_read();
992 if (type != SSH_SMSG_SUCCESS)
993 log("Warning: Remote host denied authentication agent forwarding.");
996 /* Initiate port forwardings. */
997 ssh_init_forwarding();
999 /* If requested, let ssh continue in the background. */
1000 if (fork_after_authentication_flag)
1001 if (daemon(1, 1) < 0)
1002 fatal("daemon() failed: %.200s", strerror(errno));
1005 * If a command was specified on the command line, execute the
1006 * command now. Otherwise request the server to start a shell.
1008 if (buffer_len(&command) > 0) {
1009 int len = buffer_len(&command);
1012 debug("Sending command: %.*s", len, (u_char *)buffer_ptr(&command));
1013 packet_start(SSH_CMSG_EXEC_CMD);
1014 packet_put_string(buffer_ptr(&command), buffer_len(&command));
1016 packet_write_wait();
1018 debug("Requesting shell.");
1019 packet_start(SSH_CMSG_EXEC_SHELL);
1021 packet_write_wait();
1024 /* Enter the interactive session. */
1025 return client_loop(have_tty, tty_flag ?
1026 options.escape_char : SSH_ESCAPECHAR_NONE, 0);
1030 client_subsystem_reply(int type, u_int32_t seq, void *ctxt)
1034 id = packet_get_int();
1035 len = buffer_len(&command);
1039 if (type == SSH2_MSG_CHANNEL_FAILURE)
1040 fatal("Request for subsystem '%.*s' failed on channel %d",
1041 len, (u_char *)buffer_ptr(&command), id);
1044 /* request pty/x11/agent/tcpfwd/shell for channel */
1046 ssh_session2_setup(int id, void *arg)
1049 int interactive = 0;
1052 debug("ssh_session2_setup: id %d", id);
1057 cp = getenv("TERM");
1060 /* Store window size in the packet. */
1061 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
1062 memset(&ws, 0, sizeof(ws));
1064 channel_request_start(id, "pty-req", 0);
1065 packet_put_cstring(cp);
1066 packet_put_int(ws.ws_col);
1067 packet_put_int(ws.ws_row);
1068 packet_put_int(ws.ws_xpixel);
1069 packet_put_int(ws.ws_ypixel);
1070 tio = get_saved_tio();
1071 tty_make_modes(/*ignored*/ 0, &tio);
1074 /* XXX wait for reply */
1076 if (options.forward_x11 &&
1077 getenv("DISPLAY") != NULL) {
1079 /* Get reasonable local authentication information. */
1080 x11_get_proto(&proto, &data);
1081 /* Request forwarding with authentication spoofing. */
1082 debug("Requesting X11 forwarding with authentication spoofing.");
1083 x11_request_forwarding_with_spoofing(id, proto, data);
1085 /* XXX wait for reply */
1088 check_agent_present();
1089 if (options.forward_agent) {
1090 debug("Requesting authentication agent forwarding.");
1091 channel_request_start(id, "auth-agent-req@openssh.com", 0);
1095 len = buffer_len(&command);
1099 if (subsystem_flag) {
1100 debug("Sending subsystem: %.*s", len, (u_char *)buffer_ptr(&command));
1101 channel_request_start(id, "subsystem", /*want reply*/ 1);
1102 /* register callback for reply */
1103 /* XXX we asume that client_loop has already been called */
1104 dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &client_subsystem_reply);
1105 dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &client_subsystem_reply);
1107 debug("Sending command: %.*s", len, (u_char *)buffer_ptr(&command));
1108 channel_request_start(id, "exec", 0);
1110 packet_put_string(buffer_ptr(&command), buffer_len(&command));
1113 channel_request_start(id, "shell", 0);
1117 packet_set_interactive(interactive);
1120 /* open new channel for a session */
1122 ssh_session2_open(void)
1125 int window, packetmax, in, out, err;
1127 if (stdin_null_flag) {
1128 in = open(_PATH_DEVNULL, O_RDONLY);
1130 in = dup(STDIN_FILENO);
1132 out = dup(STDOUT_FILENO);
1133 err = dup(STDERR_FILENO);
1135 if (in < 0 || out < 0 || err < 0)
1136 fatal("dup() in/out/err failed");
1138 /* enable nonblocking unless tty */
1146 window = CHAN_SES_WINDOW_DEFAULT;
1147 packetmax = CHAN_SES_PACKET_DEFAULT;
1153 "session", SSH_CHANNEL_OPENING, in, out, err,
1154 window, packetmax, CHAN_EXTENDED_WRITE,
1155 xstrdup("client-session"), /*nonblock*/0);
1157 debug3("ssh_session2_open: channel_new: %d", c->self);
1159 channel_send_open(c->self);
1161 channel_register_confirm(c->self, ssh_session2_setup);
1171 /* XXX should be pre-session */
1172 ssh_init_forwarding();
1174 if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN))
1175 id = ssh_session2_open();
1177 /* If requested, let ssh continue in the background. */
1178 if (fork_after_authentication_flag)
1179 if (daemon(1, 1) < 0)
1180 fatal("daemon() failed: %.200s", strerror(errno));
1182 return client_loop(tty_flag, tty_flag ?
1183 options.escape_char : SSH_ESCAPECHAR_NONE, id);
1187 load_public_identity_files(void)
1194 if (options.smartcard_device != NULL &&
1195 options.num_identity_files + 1 < SSH_MAX_IDENTITY_FILES &&
1196 (public = sc_get_key(options.smartcard_device)) != NULL ) {
1199 if (options.num_identity_files + 2 > SSH_MAX_IDENTITY_FILES)
1200 options.num_identity_files = SSH_MAX_IDENTITY_FILES - 2;
1201 memmove(&options.identity_files[2], &options.identity_files[0],
1202 sizeof(char *) * options.num_identity_files);
1203 options.num_identity_files += 2;
1206 /* XXX ssh1 vs ssh2 */
1207 new = key_new(KEY_RSA);
1208 new->flags = KEY_FLAG_EXT;
1209 BN_copy(new->rsa->n, public->rsa->n);
1210 BN_copy(new->rsa->e, public->rsa->e);
1211 RSA_set_method(new->rsa, sc_get_engine());
1212 options.identity_keys[0] = new;
1213 options.identity_files[0] = xstrdup("smartcard rsa key");;
1215 new = key_new(KEY_RSA1);
1216 new->flags = KEY_FLAG_EXT;
1217 BN_copy(new->rsa->n, public->rsa->n);
1218 BN_copy(new->rsa->e, public->rsa->e);
1219 RSA_set_method(new->rsa, sc_get_engine());
1220 options.identity_keys[1] = new;
1221 options.identity_files[1] = xstrdup("smartcard rsa1 key");
1225 #endif /* SMARTCARD */
1226 for (; i < options.num_identity_files; i++) {
1227 filename = tilde_expand_filename(options.identity_files[i],
1229 public = key_load_public(filename, NULL);
1230 debug("identity file %s type %d", filename,
1231 public ? public->type : -1);
1232 xfree(options.identity_files[i]);
1233 options.identity_files[i] = filename;
1234 options.identity_keys[i] = public;