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.
16 * Copyright (c) 2000, 2001, 2002 Markus Friedl. All rights reserved.
18 * Modified to work with SSL by Niels Provos <provos@citi.umich.edu>
19 * in Canada (German citizen).
21 * Redistribution and use in source and binary forms, with or without
22 * modification, are permitted provided that the following conditions
24 * 1. Redistributions of source code must retain the above copyright
25 * notice, this list of conditions and the following disclaimer.
26 * 2. Redistributions in binary form must reproduce the above copyright
27 * notice, this list of conditions and the following disclaimer in the
28 * documentation and/or other materials provided with the distribution.
30 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
31 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
32 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
33 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
34 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
35 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
36 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
37 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
38 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
39 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
43 RCSID("$OpenBSD: ssh.c,v 1.187 2002/11/21 23:04:33 markus Exp $");
45 #include <openssl/evp.h>
46 #include <openssl/err.h>
60 #include "pathnames.h"
61 #include "clientloop.h"
64 #include "sshconnect.h"
65 #include "tildexpand.h"
76 #ifdef HAVE___PROGNAME
77 extern char *__progname;
82 /* Flag indicating whether IPv4 or IPv6. This can be set on the command line.
83 Default value is AF_UNSPEC means both IPv4 and IPv6. */
85 int IPv4or6 = AF_INET;
87 int IPv4or6 = AF_UNSPEC;
90 /* Flag indicating whether debug mode is on. This can be set on the command line. */
93 /* Flag indicating whether a tty should be allocated */
96 int force_tty_flag = 0;
98 /* don't exec a shell */
99 int no_shell_flag = 0;
102 * Flag indicating that nothing should be read from stdin. This can be set
103 * on the command line.
105 int stdin_null_flag = 0;
108 * Flag indicating that ssh should fork after authentication. This is useful
109 * so that the passphrase can be entered manually, and then ssh goes to the
112 int fork_after_authentication_flag = 0;
115 * General data structure for command line options and options configurable
116 * in configuration files. See readconf.h.
120 /* optional user configfile */
124 * Name of the host we are connecting to. This is the name given on the
125 * command line, or the HostName specified for the user-supplied name in a
126 * configuration file.
130 /* socket address the host resolves to */
131 struct sockaddr_storage hostaddr;
133 /* Private host keys. */
134 Sensitive sensitive_data;
136 /* Original real UID. */
137 uid_t original_real_uid;
138 uid_t original_effective_uid;
140 /* command to be executed */
143 /* Should we execute a command or invoke a subsystem? */
144 int subsystem_flag = 0;
146 /* # of replies received for global requests */
147 static int client_global_request_id = 0;
149 /* pid of proxycommand child process */
150 pid_t proxy_command_pid = 0;
152 /* Prints a help message to the user. This function never returns. */
157 fprintf(stderr, "Usage: %s [options] host [command]\n", __progname);
158 fprintf(stderr, "Options:\n");
159 fprintf(stderr, " -l user Log in using this user name.\n");
160 fprintf(stderr, " -n Redirect input from " _PATH_DEVNULL ".\n");
161 fprintf(stderr, " -F config Config file (default: ~/%s).\n",
162 _PATH_SSH_USER_CONFFILE);
163 fprintf(stderr, " -A Enable authentication agent forwarding.\n");
164 fprintf(stderr, " -a Disable authentication agent forwarding (default).\n");
166 fprintf(stderr, " -k Disable Kerberos ticket and AFS token forwarding.\n");
168 fprintf(stderr, " -X Enable X11 connection forwarding.\n");
169 fprintf(stderr, " -x Disable X11 connection forwarding (default).\n");
170 fprintf(stderr, " -i file Identity for public key authentication "
171 "(default: ~/.ssh/identity)\n");
173 fprintf(stderr, " -I reader Set smartcard reader.\n");
175 fprintf(stderr, " -t Tty; allocate a tty even if command is given.\n");
176 fprintf(stderr, " -T Do not allocate a tty.\n");
177 fprintf(stderr, " -v Verbose; display verbose debugging messages.\n");
178 fprintf(stderr, " Multiple -v increases verbosity.\n");
179 fprintf(stderr, " -V Display version number only.\n");
180 fprintf(stderr, " -q Quiet; don't display any warning messages.\n");
181 fprintf(stderr, " -f Fork into background after authentication.\n");
182 fprintf(stderr, " -e char Set escape character; ``none'' = disable (default: ~).\n");
184 fprintf(stderr, " -c cipher Select encryption algorithm\n");
185 fprintf(stderr, " -m macs Specify MAC algorithms for protocol version 2.\n");
186 fprintf(stderr, " -p port Connect to this port. Server must be on the same port.\n");
187 fprintf(stderr, " -L listen-port:host:port Forward local port to remote address\n");
188 fprintf(stderr, " -R listen-port:host:port Forward remote port to local address\n");
189 fprintf(stderr, " These cause %s to listen for connections on a port, and\n", __progname);
190 fprintf(stderr, " forward them to the other side by connecting to host:port.\n");
191 fprintf(stderr, " -D port Enable dynamic application-level port forwarding.\n");
192 fprintf(stderr, " -C Enable compression.\n");
193 fprintf(stderr, " -N Do not execute a shell or command.\n");
194 fprintf(stderr, " -g Allow remote hosts to connect to forwarded ports.\n");
195 fprintf(stderr, " -1 Force protocol version 1.\n");
196 fprintf(stderr, " -2 Force protocol version 2.\n");
197 fprintf(stderr, " -4 Use IPv4 only.\n");
198 fprintf(stderr, " -6 Use IPv6 only.\n");
199 fprintf(stderr, " -o 'option' Process the option as if it was read from a configuration file.\n");
200 fprintf(stderr, " -s Invoke command (mandatory) as SSH2 subsystem.\n");
201 fprintf(stderr, " -b addr Local IP address.\n");
205 static int ssh_session(void);
206 static int ssh_session2(void);
207 static void load_public_identity_files(void);
210 * Main program for the ssh client.
213 main(int ac, char **av)
215 int i, opt, exit_status;
216 u_short fwd_port, fwd_host_port;
217 char sfwd_port[6], sfwd_host_port[6];
218 char *p, *cp, buf[256];
222 extern int optind, optreset;
225 __progname = get_progname(av[0]);
229 * Save the original real uid. It will be needed later (uid-swapping
230 * may clobber the real uid).
232 original_real_uid = getuid();
233 original_effective_uid = geteuid();
236 * Use uid-swapping to give up root privileges for the duration of
237 * option processing. We will re-instantiate the rights when we are
238 * ready to create the privileged port, and will permanently drop
239 * them when the port has been created (actually, when the connection
240 * has been made, as we may need to create the port several times).
244 #ifdef HAVE_SETRLIMIT
245 /* If we are installed setuid root be careful to not drop core. */
246 if (original_real_uid != original_effective_uid) {
248 rlim.rlim_cur = rlim.rlim_max = 0;
249 if (setrlimit(RLIMIT_CORE, &rlim) < 0)
250 fatal("setrlimit failed: %.100s", strerror(errno));
254 pw = getpwuid(original_real_uid);
256 log("You don't exist, go away!");
259 /* Take a copy of the returned structure. */
263 * Set our umask to something reasonable, as some files are created
264 * with the default umask. This will make them world-readable but
265 * writable only by the owner, which is ok for all files for which we
266 * don't set the modes explicitly.
270 /* Initialize option structure to indicate that no values have been set. */
271 initialize_options(&options);
273 /* Parse command-line arguments. */
277 while ((opt = getopt(ac, av,
278 "1246ab:c:e:fgi:kl:m:no:p:qstvxACD:F:I:L:NPR:TVX")) != -1) {
281 options.protocol = SSH_PROTO_1;
284 options.protocol = SSH_PROTO_2;
296 fork_after_authentication_flag = 1;
300 options.forward_x11 = 0;
303 options.forward_x11 = 1;
306 options.gateway_ports = 1;
308 case 'P': /* deprecated */
309 options.use_privileged_port = 0;
312 options.forward_agent = 0;
315 options.forward_agent = 1;
319 options.kerberos_tgt_passing = 0;
320 options.afs_token_passing = 0;
324 if (stat(optarg, &st) < 0) {
325 fprintf(stderr, "Warning: Identity file %s "
326 "does not exist.\n", optarg);
329 if (options.num_identity_files >=
330 SSH_MAX_IDENTITY_FILES)
331 fatal("Too many identity files specified "
332 "(max %d)", SSH_MAX_IDENTITY_FILES);
333 options.identity_files[options.num_identity_files++] =
338 options.smartcard_device = xstrdup(optarg);
340 fprintf(stderr, "no support for smartcards.\n");
349 if (0 == debug_flag) {
351 options.log_level = SYSLOG_LEVEL_DEBUG1;
352 } else if (options.log_level < SYSLOG_LEVEL_DEBUG3) {
356 fatal("Too high debugging level.");
360 "%s, SSH protocols %d.%d/%d.%d, OpenSSL 0x%8.8lx\n",
362 PROTOCOL_MAJOR_1, PROTOCOL_MINOR_1,
363 PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2,
369 options.log_level = SYSLOG_LEVEL_QUIET;
372 if (optarg[0] == '^' && optarg[2] == 0 &&
373 (u_char) optarg[1] >= 64 &&
374 (u_char) optarg[1] < 128)
375 options.escape_char = (u_char) optarg[1] & 31;
376 else if (strlen(optarg) == 1)
377 options.escape_char = (u_char) optarg[0];
378 else if (strcmp(optarg, "none") == 0)
379 options.escape_char = SSH_ESCAPECHAR_NONE;
381 fprintf(stderr, "Bad escape character '%s'.\n",
387 if (ciphers_valid(optarg)) {
389 options.ciphers = xstrdup(optarg);
390 options.cipher = SSH_CIPHER_ILLEGAL;
393 options.cipher = cipher_number(optarg);
394 if (options.cipher == -1) {
396 "Unknown cipher type '%s'\n",
400 if (options.cipher == SSH_CIPHER_3DES)
401 options.ciphers = "3des-cbc";
402 else if (options.cipher == SSH_CIPHER_BLOWFISH)
403 options.ciphers = "blowfish-cbc";
405 options.ciphers = (char *)-1;
409 if (mac_valid(optarg))
410 options.macs = xstrdup(optarg);
412 fprintf(stderr, "Unknown mac type '%s'\n",
418 options.port = a2port(optarg);
419 if (options.port == 0) {
420 fprintf(stderr, "Bad port '%s'\n", optarg);
425 options.user = optarg;
430 if (sscanf(optarg, "%5[0-9]:%255[^:]:%5[0-9]",
431 sfwd_port, buf, sfwd_host_port) != 3 &&
432 sscanf(optarg, "%5[0-9]/%255[^/]/%5[0-9]",
433 sfwd_port, buf, sfwd_host_port) != 3) {
435 "Bad forwarding specification '%s'\n",
440 if ((fwd_port = a2port(sfwd_port)) == 0 ||
441 (fwd_host_port = a2port(sfwd_host_port)) == 0) {
443 "Bad forwarding port(s) '%s'\n", optarg);
447 add_local_forward(&options, fwd_port, buf,
450 add_remote_forward(&options, fwd_port, buf,
455 fwd_port = a2port(optarg);
457 fprintf(stderr, "Bad dynamic port '%s'\n",
461 add_local_forward(&options, fwd_port, "socks4", 0);
465 options.compression = 1;
476 if (process_config_line(&options, host ? host : "",
477 optarg, "command-line", 0, &dummy) != 0)
484 options.bind_address = optarg;
497 if (ac > 0 && !host && **av != '-') {
498 if (strchr(*av, '@')) {
501 if (cp == NULL || cp == p)
516 /* Check that we got a host name. */
520 SSLeay_add_all_algorithms();
521 ERR_load_crypto_strings();
522 channel_set_af(IPv4or6);
524 /* Initialize the command to execute on remote host. */
525 buffer_init(&command);
528 * Save the command to execute on the remote host in a buffer. There
529 * is no limit on the length of the command, except by the maximum
530 * packet size. Also sets the tty flag if there is no command.
533 /* No command specified - execute shell on a tty. */
535 if (subsystem_flag) {
537 "You must specify a subsystem to invoke.\n");
541 /* A command has been specified. Store it into the buffer. */
542 for (i = 0; i < ac; i++) {
544 buffer_append(&command, " ", 1);
545 buffer_append(&command, av[i], strlen(av[i]));
549 /* Cannot fork to background if no command. */
550 if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag)
551 fatal("Cannot fork into background without a command to execute.");
553 /* Allocate a tty by default if no command specified. */
554 if (buffer_len(&command) == 0)
560 /* Do not allocate a tty if stdin is not a tty. */
561 if (!isatty(fileno(stdin)) && !force_tty_flag) {
563 log("Pseudo-terminal will not be allocated because stdin is not a terminal.");
568 * Initialize "log" output. Since we are the client all output
569 * actually goes to stderr.
571 log_init(av[0], options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level,
572 SYSLOG_FACILITY_USER, 1);
575 * Read per-user configuration file. Ignore the system wide config
576 * file if the user specifies a config file on the command line.
578 if (config != NULL) {
579 if (!read_config_file(config, host, &options))
580 fatal("Can't open user config file %.100s: "
581 "%.100s", config, strerror(errno));
583 snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir,
584 _PATH_SSH_USER_CONFFILE);
585 (void)read_config_file(buf, host, &options);
587 /* Read systemwide configuration file after use config. */
588 (void)read_config_file(_PATH_HOST_CONFIG_FILE, host, &options);
591 /* Fill configuration defaults. */
592 fill_default_options(&options);
595 log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 1);
599 if (options.user == NULL)
600 options.user = xstrdup(pw->pw_name);
602 if (options.hostname != NULL)
603 host = options.hostname;
605 /* Disable rhosts authentication if not running as root. */
607 /* Ignore uid if running under Windows */
608 if (!options.use_privileged_port) {
610 if (original_effective_uid != 0 || !options.use_privileged_port) {
612 debug("Rhosts Authentication disabled, "
613 "originating port will not be trusted.");
614 options.rhosts_authentication = 0;
616 /* Open a connection to the remote host. */
618 if (ssh_connect(host, &hostaddr, options.port, IPv4or6,
619 options.connection_attempts,
621 options.use_privileged_port,
623 original_effective_uid == 0 && options.use_privileged_port,
625 options.proxy_command) != 0)
629 * If we successfully made the connection, load the host private key
630 * in case we will need it later for combined rsa-rhosts
631 * authentication. This must be done before releasing extra
632 * privileges, because the file is only readable by root.
633 * If we cannot access the private keys, load the public keys
634 * instead and try to execute the ssh-keysign helper instead.
636 sensitive_data.nkeys = 0;
637 sensitive_data.keys = NULL;
638 sensitive_data.external_keysign = 0;
639 if (options.rhosts_rsa_authentication ||
640 options.hostbased_authentication) {
641 sensitive_data.nkeys = 3;
642 sensitive_data.keys = xmalloc(sensitive_data.nkeys *
646 sensitive_data.keys[0] = key_load_private_type(KEY_RSA1,
647 _PATH_HOST_KEY_FILE, "", NULL);
648 sensitive_data.keys[1] = key_load_private_type(KEY_DSA,
649 _PATH_HOST_DSA_KEY_FILE, "", NULL);
650 sensitive_data.keys[2] = key_load_private_type(KEY_RSA,
651 _PATH_HOST_RSA_KEY_FILE, "", NULL);
654 if (options.hostbased_authentication == 1 &&
655 sensitive_data.keys[0] == NULL &&
656 sensitive_data.keys[1] == NULL &&
657 sensitive_data.keys[2] == NULL) {
658 sensitive_data.keys[1] = key_load_public(
659 _PATH_HOST_DSA_KEY_FILE, NULL);
660 sensitive_data.keys[2] = key_load_public(
661 _PATH_HOST_RSA_KEY_FILE, NULL);
662 sensitive_data.external_keysign = 1;
666 * Get rid of any extra privileges that we may have. We will no
667 * longer need them. Also, extra privileges could make it very hard
668 * to read identity files and other non-world-readable files from the
669 * user's home directory if it happens to be on a NFS volume where
670 * root is mapped to nobody.
672 seteuid(original_real_uid);
673 setuid(original_real_uid);
676 * Now that we are back to our own permissions, create ~/.ssh
677 * directory if it doesn\'t already exist.
679 snprintf(buf, sizeof buf, "%.100s%s%.100s", pw->pw_dir, strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR);
680 if (stat(buf, &st) < 0)
681 if (mkdir(buf, 0700) < 0)
682 error("Could not create directory '%.200s'.", buf);
684 /* load options.identity_files */
685 load_public_identity_files();
687 /* Expand ~ in known host file names. */
689 options.system_hostfile =
690 tilde_expand_filename(options.system_hostfile, original_real_uid);
691 options.user_hostfile =
692 tilde_expand_filename(options.user_hostfile, original_real_uid);
693 options.system_hostfile2 =
694 tilde_expand_filename(options.system_hostfile2, original_real_uid);
695 options.user_hostfile2 =
696 tilde_expand_filename(options.user_hostfile2, original_real_uid);
698 signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
700 /* Log into the remote system. This never returns if the login fails. */
701 ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr, pw);
703 /* We no longer need the private host keys. Clear them now. */
704 if (sensitive_data.nkeys != 0) {
705 for (i = 0; i < sensitive_data.nkeys; i++) {
706 if (sensitive_data.keys[i] != NULL) {
707 /* Destroys contents safely */
708 debug3("clear hostkey %d", i);
709 key_free(sensitive_data.keys[i]);
710 sensitive_data.keys[i] = NULL;
713 xfree(sensitive_data.keys);
715 for (i = 0; i < options.num_identity_files; i++) {
716 if (options.identity_files[i]) {
717 xfree(options.identity_files[i]);
718 options.identity_files[i] = NULL;
720 if (options.identity_keys[i]) {
721 key_free(options.identity_keys[i]);
722 options.identity_keys[i] = NULL;
726 exit_status = compat20 ? ssh_session2() : ssh_session();
730 * Send SIGHUP to proxy command if used. We don't wait() in
731 * case it hangs and instead rely on init to reap the child
733 if (proxy_command_pid > 1)
734 kill(proxy_command_pid, SIGHUP);
740 x11_get_proto(char **_proto, char **_data)
743 static char proto[512], data[512];
751 proto[0] = data[0] = '\0';
752 if (!options.xauth_location ||
753 (stat(options.xauth_location, &st) == -1)) {
754 debug("No xauth program.");
756 if ((display = getenv("DISPLAY")) == NULL) {
757 debug("x11_get_proto: DISPLAY not set");
760 /* Try to get Xauthority information for the display. */
761 if (strncmp(display, "localhost:", 10) == 0)
763 * Handle FamilyLocal case where $DISPLAY does
764 * not match an authorization entry. For this we
765 * just try "xauth list unix:displaynum.screennum".
766 * XXX: "localhost" match to determine FamilyLocal
769 snprintf(line, sizeof line, "%s list unix:%s 2>"
770 _PATH_DEVNULL, options.xauth_location, display+10);
772 snprintf(line, sizeof line, "%s list %.200s 2>"
773 _PATH_DEVNULL, options.xauth_location, display);
774 debug2("x11_get_proto: %s", line);
775 f = popen(line, "r");
776 if (f && fgets(line, sizeof(line), f) &&
777 sscanf(line, "%*s %511s %511s", proto, data) == 2)
783 * If we didn't get authentication data, just make up some
784 * data. The forwarding code will check the validity of the
785 * response anyway, and substitute this data. The X11
786 * server, however, will ignore this fake data and use
787 * whatever authentication mechanisms it was using otherwise
788 * for the local connection.
793 log("Warning: No xauth data; using fake authentication data for X11 forwarding.");
794 strlcpy(proto, "MIT-MAGIC-COOKIE-1", sizeof proto);
795 for (i = 0; i < 16; i++) {
798 snprintf(data + 2 * i, sizeof data - 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_setup_local_fwd_listener(
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 if (!ssh_agent_present())
844 options.forward_agent = 0;
857 /* Enable compression if requested. */
858 if (options.compression) {
859 debug("Requesting compression at level %d.", options.compression_level);
861 if (options.compression_level < 1 || options.compression_level > 9)
862 fatal("Compression level must be from 1 (fast) to 9 (slow, best).");
864 /* Send the request. */
865 packet_start(SSH_CMSG_REQUEST_COMPRESSION);
866 packet_put_int(options.compression_level);
869 type = packet_read();
870 if (type == SSH_SMSG_SUCCESS)
871 packet_start_compression(options.compression_level);
872 else if (type == SSH_SMSG_FAILURE)
873 log("Warning: Remote host refused compression.");
875 packet_disconnect("Protocol error waiting for compression response.");
877 /* Allocate a pseudo tty if appropriate. */
879 debug("Requesting pty.");
881 /* Start the packet. */
882 packet_start(SSH_CMSG_REQUEST_PTY);
884 /* Store TERM in the packet. There is no limit on the
885 length of the string. */
889 packet_put_cstring(cp);
891 /* Store window size in the packet. */
892 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
893 memset(&ws, 0, sizeof(ws));
894 packet_put_int(ws.ws_row);
895 packet_put_int(ws.ws_col);
896 packet_put_int(ws.ws_xpixel);
897 packet_put_int(ws.ws_ypixel);
899 /* Store tty modes in the packet. */
900 tty_make_modes(fileno(stdin), NULL);
902 /* Send the packet, and wait for it to leave. */
906 /* Read response from the server. */
907 type = packet_read();
908 if (type == SSH_SMSG_SUCCESS) {
911 } else if (type == SSH_SMSG_FAILURE)
912 log("Warning: Remote host failed or refused to allocate a pseudo tty.");
914 packet_disconnect("Protocol error waiting for pty request response.");
916 /* Request X11 forwarding if enabled and DISPLAY is set. */
917 if (options.forward_x11 && getenv("DISPLAY") != NULL) {
919 /* Get reasonable local authentication information. */
920 x11_get_proto(&proto, &data);
921 /* Request forwarding with authentication spoofing. */
922 debug("Requesting X11 forwarding with authentication spoofing.");
923 x11_request_forwarding_with_spoofing(0, proto, data);
925 /* Read response from the server. */
926 type = packet_read();
927 if (type == SSH_SMSG_SUCCESS) {
929 } else if (type == SSH_SMSG_FAILURE) {
930 log("Warning: Remote host denied X11 forwarding.");
932 packet_disconnect("Protocol error waiting for X11 forwarding");
935 /* Tell the packet module whether this is an interactive session. */
936 packet_set_interactive(interactive);
938 /* Request authentication agent forwarding if appropriate. */
939 check_agent_present();
941 if (options.forward_agent) {
942 debug("Requesting authentication agent forwarding.");
943 auth_request_forwarding();
945 /* Read response from the server. */
946 type = packet_read();
948 if (type != SSH_SMSG_SUCCESS)
949 log("Warning: Remote host denied authentication agent forwarding.");
952 /* Initiate port forwardings. */
953 ssh_init_forwarding();
955 /* If requested, let ssh continue in the background. */
956 if (fork_after_authentication_flag)
957 if (daemon(1, 1) < 0)
958 fatal("daemon() failed: %.200s", strerror(errno));
961 * If a command was specified on the command line, execute the
962 * command now. Otherwise request the server to start a shell.
964 if (buffer_len(&command) > 0) {
965 int len = buffer_len(&command);
968 debug("Sending command: %.*s", len, (u_char *)buffer_ptr(&command));
969 packet_start(SSH_CMSG_EXEC_CMD);
970 packet_put_string(buffer_ptr(&command), buffer_len(&command));
974 debug("Requesting shell.");
975 packet_start(SSH_CMSG_EXEC_SHELL);
980 /* Enter the interactive session. */
981 return client_loop(have_tty, tty_flag ?
982 options.escape_char : SSH_ESCAPECHAR_NONE, 0);
986 client_subsystem_reply(int type, u_int32_t seq, void *ctxt)
990 id = packet_get_int();
991 len = buffer_len(&command);
995 if (type == SSH2_MSG_CHANNEL_FAILURE)
996 fatal("Request for subsystem '%.*s' failed on channel %d",
997 len, (u_char *)buffer_ptr(&command), id);
1001 client_global_request_reply(int type, u_int32_t seq, void *ctxt)
1005 i = client_global_request_id++;
1006 if (i >= options.num_remote_forwards) {
1007 debug("client_global_request_reply: too many replies %d > %d",
1008 i, options.num_remote_forwards);
1011 debug("remote forward %s for: listen %d, connect %s:%d",
1012 type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
1013 options.remote_forwards[i].port,
1014 options.remote_forwards[i].host,
1015 options.remote_forwards[i].host_port);
1016 if (type == SSH2_MSG_REQUEST_FAILURE)
1017 log("Warning: remote port forwarding failed for listen port %d",
1018 options.remote_forwards[i].port);
1021 /* request pty/x11/agent/tcpfwd/shell for channel */
1023 ssh_session2_setup(int id, void *arg)
1026 int interactive = 0;
1029 debug2("ssh_session2_setup: id %d", id);
1034 cp = getenv("TERM");
1037 /* Store window size in the packet. */
1038 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
1039 memset(&ws, 0, sizeof(ws));
1041 channel_request_start(id, "pty-req", 0);
1042 packet_put_cstring(cp);
1043 packet_put_int(ws.ws_col);
1044 packet_put_int(ws.ws_row);
1045 packet_put_int(ws.ws_xpixel);
1046 packet_put_int(ws.ws_ypixel);
1047 tio = get_saved_tio();
1048 tty_make_modes(/*ignored*/ 0, &tio);
1051 /* XXX wait for reply */
1053 if (options.forward_x11 &&
1054 getenv("DISPLAY") != NULL) {
1056 /* Get reasonable local authentication information. */
1057 x11_get_proto(&proto, &data);
1058 /* Request forwarding with authentication spoofing. */
1059 debug("Requesting X11 forwarding with authentication spoofing.");
1060 x11_request_forwarding_with_spoofing(id, proto, data);
1062 /* XXX wait for reply */
1065 check_agent_present();
1066 if (options.forward_agent) {
1067 debug("Requesting authentication agent forwarding.");
1068 channel_request_start(id, "auth-agent-req@openssh.com", 0);
1072 len = buffer_len(&command);
1076 if (subsystem_flag) {
1077 debug("Sending subsystem: %.*s", len, (u_char *)buffer_ptr(&command));
1078 channel_request_start(id, "subsystem", /*want reply*/ 1);
1079 /* register callback for reply */
1080 /* XXX we assume that client_loop has already been called */
1081 dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &client_subsystem_reply);
1082 dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &client_subsystem_reply);
1084 debug("Sending command: %.*s", len, (u_char *)buffer_ptr(&command));
1085 channel_request_start(id, "exec", 0);
1087 packet_put_string(buffer_ptr(&command), buffer_len(&command));
1090 channel_request_start(id, "shell", 0);
1094 packet_set_interactive(interactive);
1097 /* open new channel for a session */
1099 ssh_session2_open(void)
1102 int window, packetmax, in, out, err;
1104 if (stdin_null_flag) {
1105 in = open(_PATH_DEVNULL, O_RDONLY);
1107 in = dup(STDIN_FILENO);
1109 out = dup(STDOUT_FILENO);
1110 err = dup(STDERR_FILENO);
1112 if (in < 0 || out < 0 || err < 0)
1113 fatal("dup() in/out/err failed");
1115 /* enable nonblocking unless tty */
1123 window = CHAN_SES_WINDOW_DEFAULT;
1124 packetmax = CHAN_SES_PACKET_DEFAULT;
1130 "session", SSH_CHANNEL_OPENING, in, out, err,
1131 window, packetmax, CHAN_EXTENDED_WRITE,
1132 xstrdup("client-session"), /*nonblock*/0);
1134 debug3("ssh_session2_open: channel_new: %d", c->self);
1136 channel_send_open(c->self);
1138 channel_register_confirm(c->self, ssh_session2_setup);
1148 /* XXX should be pre-session */
1149 ssh_init_forwarding();
1151 if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN))
1152 id = ssh_session2_open();
1154 /* If requested, let ssh continue in the background. */
1155 if (fork_after_authentication_flag)
1156 if (daemon(1, 1) < 0)
1157 fatal("daemon() failed: %.200s", strerror(errno));
1159 return client_loop(tty_flag, tty_flag ?
1160 options.escape_char : SSH_ESCAPECHAR_NONE, id);
1164 load_public_identity_files(void)
1172 if (options.smartcard_device != NULL &&
1173 options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
1174 (keys = sc_get_keys(options.smartcard_device, NULL)) != NULL ) {
1176 for (i = 0; keys[i] != NULL; i++) {
1178 memmove(&options.identity_files[1], &options.identity_files[0],
1179 sizeof(char *) * (SSH_MAX_IDENTITY_FILES - 1));
1180 memmove(&options.identity_keys[1], &options.identity_keys[0],
1181 sizeof(Key *) * (SSH_MAX_IDENTITY_FILES - 1));
1182 options.num_identity_files++;
1183 options.identity_keys[0] = keys[i];
1184 options.identity_files[0] = xstrdup("smartcard key");;
1186 if (options.num_identity_files > SSH_MAX_IDENTITY_FILES)
1187 options.num_identity_files = SSH_MAX_IDENTITY_FILES;
1191 #endif /* SMARTCARD */
1192 for (; i < options.num_identity_files; i++) {
1193 filename = tilde_expand_filename(options.identity_files[i],
1195 public = key_load_public(filename, NULL);
1196 debug("identity file %s type %d", filename,
1197 public ? public->type : -1);
1198 xfree(options.identity_files[i]);
1199 options.identity_files[i] = filename;
1200 options.identity_keys[i] = public;