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-rw-r--r--crypto/openssh/ssh.c1484
1 files changed, 0 insertions, 1484 deletions
diff --git a/crypto/openssh/ssh.c b/crypto/openssh/ssh.c
deleted file mode 100644
index 47297ed..0000000
--- a/crypto/openssh/ssh.c
+++ /dev/null
@@ -1,1484 +0,0 @@
-/* $OpenBSD: ssh.c,v 1.294 2006/10/06 02:29:19 djm Exp $ */
-/*
- * Author: Tatu Ylonen <ylo@cs.hut.fi>
- * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
- * All rights reserved
- * Ssh client program. This program can be used to log into a remote machine.
- * The software supports strong authentication, encryption, and forwarding
- * of X11, TCP/IP, and authentication connections.
- *
- * As far as I am concerned, the code I have written for this software
- * can be used freely for any purpose. Any derived versions of this
- * software must be clearly marked as such, and if the derived work is
- * incompatible with the protocol description in the RFC file, it must be
- * called by a name other than "ssh" or "Secure Shell".
- *
- * Copyright (c) 1999 Niels Provos. All rights reserved.
- * Copyright (c) 2000, 2001, 2002, 2003 Markus Friedl. All rights reserved.
- *
- * Modified to work with SSL by Niels Provos <provos@citi.umich.edu>
- * in Canada (German citizen).
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
- * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
- * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
- * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#include "includes.h"
-
-#include <sys/types.h>
-#ifdef HAVE_SYS_STAT_H
-# include <sys/stat.h>
-#endif
-#include <sys/resource.h>
-#include <sys/ioctl.h>
-#include <sys/socket.h>
-#include <sys/un.h>
-
-#include <ctype.h>
-#include <errno.h>
-#include <fcntl.h>
-#include <netdb.h>
-#ifdef HAVE_PATHS_H
-#include <paths.h>
-#endif
-#include <pwd.h>
-#include <signal.h>
-#include <stdarg.h>
-#include <stddef.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-
-#include <netinet/in.h>
-#include <arpa/inet.h>
-
-#include <openssl/evp.h>
-#include <openssl/err.h>
-
-#include "xmalloc.h"
-#include "ssh.h"
-#include "ssh1.h"
-#include "ssh2.h"
-#include "compat.h"
-#include "cipher.h"
-#include "packet.h"
-#include "buffer.h"
-#include "channels.h"
-#include "key.h"
-#include "authfd.h"
-#include "authfile.h"
-#include "pathnames.h"
-#include "dispatch.h"
-#include "clientloop.h"
-#include "log.h"
-#include "readconf.h"
-#include "sshconnect.h"
-#include "misc.h"
-#include "kex.h"
-#include "mac.h"
-#include "sshpty.h"
-#include "match.h"
-#include "msg.h"
-#include "monitor_fdpass.h"
-#include "uidswap.h"
-#include "version.h"
-
-#ifdef SMARTCARD
-#include "scard.h"
-#endif
-
-extern char *__progname;
-
-/* Flag indicating whether debug mode is on. This can be set on the command line. */
-int debug_flag = 0;
-
-/* Flag indicating whether a tty should be allocated */
-int tty_flag = 0;
-int no_tty_flag = 0;
-int force_tty_flag = 0;
-
-/* don't exec a shell */
-int no_shell_flag = 0;
-
-/*
- * Flag indicating that nothing should be read from stdin. This can be set
- * on the command line.
- */
-int stdin_null_flag = 0;
-
-/*
- * Flag indicating that ssh should fork after authentication. This is useful
- * so that the passphrase can be entered manually, and then ssh goes to the
- * background.
- */
-int fork_after_authentication_flag = 0;
-
-/*
- * General data structure for command line options and options configurable
- * in configuration files. See readconf.h.
- */
-Options options;
-
-/* optional user configfile */
-char *config = NULL;
-
-/*
- * Name of the host we are connecting to. This is the name given on the
- * command line, or the HostName specified for the user-supplied name in a
- * configuration file.
- */
-char *host;
-
-/* socket address the host resolves to */
-struct sockaddr_storage hostaddr;
-
-/* Private host keys. */
-Sensitive sensitive_data;
-
-/* Original real UID. */
-uid_t original_real_uid;
-uid_t original_effective_uid;
-
-/* command to be executed */
-Buffer command;
-
-/* Should we execute a command or invoke a subsystem? */
-int subsystem_flag = 0;
-
-/* # of replies received for global requests */
-static int client_global_request_id = 0;
-
-/* pid of proxycommand child process */
-pid_t proxy_command_pid = 0;
-
-/* fd to control socket */
-int control_fd = -1;
-
-/* Multiplexing control command */
-static u_int mux_command = 0;
-
-/* Only used in control client mode */
-volatile sig_atomic_t control_client_terminate = 0;
-u_int control_server_pid = 0;
-
-/* Prints a help message to the user. This function never returns. */
-
-static void
-usage(void)
-{
- fprintf(stderr,
-"usage: ssh [-1246AaCfgkMNnqsTtVvXxY] [-b bind_address] [-c cipher_spec]\n"
-" [-D [bind_address:]port] [-e escape_char] [-F configfile]\n"
-" [-i identity_file] [-L [bind_address:]port:host:hostport]\n"
-" [-l login_name] [-m mac_spec] [-O ctl_cmd] [-o option] [-p port]\n"
-" [-R [bind_address:]port:host:hostport] [-S ctl_path]\n"
-" [-w local_tun[:remote_tun]] [user@]hostname [command]\n"
- );
- exit(255);
-}
-
-static int ssh_session(void);
-static int ssh_session2(void);
-static void load_public_identity_files(void);
-static void control_client(const char *path);
-
-/*
- * Main program for the ssh client.
- */
-int
-main(int ac, char **av)
-{
- int i, opt, exit_status;
- char *p, *cp, *line, buf[256];
- struct stat st;
- struct passwd *pw;
- int dummy;
- extern int optind, optreset;
- extern char *optarg;
- struct servent *sp;
- Forward fwd;
-
- /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
- sanitise_stdfd();
-
- __progname = ssh_get_progname(av[0]);
- init_rng();
-
- /*
- * Save the original real uid. It will be needed later (uid-swapping
- * may clobber the real uid).
- */
- original_real_uid = getuid();
- original_effective_uid = geteuid();
-
- /*
- * Use uid-swapping to give up root privileges for the duration of
- * option processing. We will re-instantiate the rights when we are
- * ready to create the privileged port, and will permanently drop
- * them when the port has been created (actually, when the connection
- * has been made, as we may need to create the port several times).
- */
- PRIV_END;
-
-#ifdef HAVE_SETRLIMIT
- /* If we are installed setuid root be careful to not drop core. */
- if (original_real_uid != original_effective_uid) {
- struct rlimit rlim;
- rlim.rlim_cur = rlim.rlim_max = 0;
- if (setrlimit(RLIMIT_CORE, &rlim) < 0)
- fatal("setrlimit failed: %.100s", strerror(errno));
- }
-#endif
- /* Get user data. */
- pw = getpwuid(original_real_uid);
- if (!pw) {
- logit("You don't exist, go away!");
- exit(255);
- }
- /* Take a copy of the returned structure. */
- pw = pwcopy(pw);
-
- /*
- * Set our umask to something reasonable, as some files are created
- * with the default umask. This will make them world-readable but
- * writable only by the owner, which is ok for all files for which we
- * don't set the modes explicitly.
- */
- umask(022);
-
- /* Initialize option structure to indicate that no values have been set. */
- initialize_options(&options);
-
- /* Parse command-line arguments. */
- host = NULL;
-
- again:
- while ((opt = getopt(ac, av,
- "1246ab:c:e:fgi:kl:m:no:p:qstvxACD:F:I:L:MNO:PR:S:TVw:XY")) != -1) {
- switch (opt) {
- case '1':
- options.protocol = SSH_PROTO_1;
- break;
- case '2':
- options.protocol = SSH_PROTO_2;
- break;
- case '4':
- options.address_family = AF_INET;
- break;
- case '6':
- options.address_family = AF_INET6;
- break;
- case 'n':
- stdin_null_flag = 1;
- break;
- case 'f':
- fork_after_authentication_flag = 1;
- stdin_null_flag = 1;
- break;
- case 'x':
- options.forward_x11 = 0;
- break;
- case 'X':
- options.forward_x11 = 1;
- break;
- case 'Y':
- options.forward_x11 = 1;
- options.forward_x11_trusted = 1;
- break;
- case 'g':
- options.gateway_ports = 1;
- break;
- case 'O':
- if (strcmp(optarg, "check") == 0)
- mux_command = SSHMUX_COMMAND_ALIVE_CHECK;
- else if (strcmp(optarg, "exit") == 0)
- mux_command = SSHMUX_COMMAND_TERMINATE;
- else
- fatal("Invalid multiplex command.");
- break;
- case 'P': /* deprecated */
- options.use_privileged_port = 0;
- break;
- case 'a':
- options.forward_agent = 0;
- break;
- case 'A':
- options.forward_agent = 1;
- break;
- case 'k':
- options.gss_deleg_creds = 0;
- break;
- case 'i':
- if (stat(optarg, &st) < 0) {
- fprintf(stderr, "Warning: Identity file %s "
- "not accessible: %s.\n", optarg,
- strerror(errno));
- break;
- }
- if (options.num_identity_files >=
- SSH_MAX_IDENTITY_FILES)
- fatal("Too many identity files specified "
- "(max %d)", SSH_MAX_IDENTITY_FILES);
- options.identity_files[options.num_identity_files++] =
- xstrdup(optarg);
- break;
- case 'I':
-#ifdef SMARTCARD
- options.smartcard_device = xstrdup(optarg);
-#else
- fprintf(stderr, "no support for smartcards.\n");
-#endif
- break;
- case 't':
- if (tty_flag)
- force_tty_flag = 1;
- tty_flag = 1;
- break;
- case 'v':
- if (debug_flag == 0) {
- debug_flag = 1;
- options.log_level = SYSLOG_LEVEL_DEBUG1;
- } else {
- if (options.log_level < SYSLOG_LEVEL_DEBUG3)
- options.log_level++;
- break;
- }
- /* FALLTHROUGH */
- case 'V':
- fprintf(stderr, "%s, %s\n",
- SSH_RELEASE, SSLeay_version(SSLEAY_VERSION));
- if (opt == 'V')
- exit(0);
- break;
- case 'w':
- if (options.tun_open == -1)
- options.tun_open = SSH_TUNMODE_DEFAULT;
- options.tun_local = a2tun(optarg, &options.tun_remote);
- if (options.tun_local == SSH_TUNID_ERR) {
- fprintf(stderr, "Bad tun device '%s'\n", optarg);
- exit(255);
- }
- break;
- case 'q':
- options.log_level = SYSLOG_LEVEL_QUIET;
- break;
- case 'e':
- if (optarg[0] == '^' && optarg[2] == 0 &&
- (u_char) optarg[1] >= 64 &&
- (u_char) optarg[1] < 128)
- options.escape_char = (u_char) optarg[1] & 31;
- else if (strlen(optarg) == 1)
- options.escape_char = (u_char) optarg[0];
- else if (strcmp(optarg, "none") == 0)
- options.escape_char = SSH_ESCAPECHAR_NONE;
- else {
- fprintf(stderr, "Bad escape character '%s'.\n",
- optarg);
- exit(255);
- }
- break;
- case 'c':
- if (ciphers_valid(optarg)) {
- /* SSH2 only */
- options.ciphers = xstrdup(optarg);
- options.cipher = SSH_CIPHER_INVALID;
- } else {
- /* SSH1 only */
- options.cipher = cipher_number(optarg);
- if (options.cipher == -1) {
- fprintf(stderr,
- "Unknown cipher type '%s'\n",
- optarg);
- exit(255);
- }
- if (options.cipher == SSH_CIPHER_3DES)
- options.ciphers = "3des-cbc";
- else if (options.cipher == SSH_CIPHER_BLOWFISH)
- options.ciphers = "blowfish-cbc";
- else
- options.ciphers = (char *)-1;
- }
- break;
- case 'm':
- if (mac_valid(optarg))
- options.macs = xstrdup(optarg);
- else {
- fprintf(stderr, "Unknown mac type '%s'\n",
- optarg);
- exit(255);
- }
- break;
- case 'M':
- if (options.control_master == SSHCTL_MASTER_YES)
- options.control_master = SSHCTL_MASTER_ASK;
- else
- options.control_master = SSHCTL_MASTER_YES;
- break;
- case 'p':
- options.port = a2port(optarg);
- if (options.port == 0) {
- fprintf(stderr, "Bad port '%s'\n", optarg);
- exit(255);
- }
- break;
- case 'l':
- options.user = optarg;
- break;
-
- case 'L':
- if (parse_forward(&fwd, optarg))
- add_local_forward(&options, &fwd);
- else {
- fprintf(stderr,
- "Bad local forwarding specification '%s'\n",
- optarg);
- exit(255);
- }
- break;
-
- case 'R':
- if (parse_forward(&fwd, optarg)) {
- add_remote_forward(&options, &fwd);
- } else {
- fprintf(stderr,
- "Bad remote forwarding specification "
- "'%s'\n", optarg);
- exit(255);
- }
- break;
-
- case 'D':
- cp = p = xstrdup(optarg);
- memset(&fwd, '\0', sizeof(fwd));
- fwd.connect_host = "socks";
- if ((fwd.listen_host = hpdelim(&cp)) == NULL) {
- fprintf(stderr, "Bad dynamic forwarding "
- "specification '%.100s'\n", optarg);
- exit(255);
- }
- if (cp != NULL) {
- fwd.listen_port = a2port(cp);
- fwd.listen_host = cleanhostname(fwd.listen_host);
- } else {
- fwd.listen_port = a2port(fwd.listen_host);
- fwd.listen_host = NULL;
- }
-
- if (fwd.listen_port == 0) {
- fprintf(stderr, "Bad dynamic port '%s'\n",
- optarg);
- exit(255);
- }
- add_local_forward(&options, &fwd);
- xfree(p);
- break;
-
- case 'C':
- options.compression = 1;
- break;
- case 'N':
- no_shell_flag = 1;
- no_tty_flag = 1;
- break;
- case 'T':
- no_tty_flag = 1;
- break;
- case 'o':
- dummy = 1;
- line = xstrdup(optarg);
- if (process_config_line(&options, host ? host : "",
- line, "command-line", 0, &dummy) != 0)
- exit(255);
- xfree(line);
- break;
- case 's':
- subsystem_flag = 1;
- break;
- case 'S':
- if (options.control_path != NULL)
- free(options.control_path);
- options.control_path = xstrdup(optarg);
- break;
- case 'b':
- options.bind_address = optarg;
- break;
- case 'F':
- config = optarg;
- break;
- default:
- usage();
- }
- }
-
- ac -= optind;
- av += optind;
-
- if (ac > 0 && !host && **av != '-') {
- if (strrchr(*av, '@')) {
- p = xstrdup(*av);
- cp = strrchr(p, '@');
- if (cp == NULL || cp == p)
- usage();
- options.user = p;
- *cp = '\0';
- host = ++cp;
- } else
- host = *av;
- if (ac > 1) {
- optind = optreset = 1;
- goto again;
- }
- ac--, av++;
- }
-
- /* Check that we got a host name. */
- if (!host)
- usage();
-
- SSLeay_add_all_algorithms();
- ERR_load_crypto_strings();
-
- /* Initialize the command to execute on remote host. */
- buffer_init(&command);
-
- /*
- * Save the command to execute on the remote host in a buffer. There
- * is no limit on the length of the command, except by the maximum
- * packet size. Also sets the tty flag if there is no command.
- */
- if (!ac) {
- /* No command specified - execute shell on a tty. */
- tty_flag = 1;
- if (subsystem_flag) {
- fprintf(stderr,
- "You must specify a subsystem to invoke.\n");
- usage();
- }
- } else {
- /* A command has been specified. Store it into the buffer. */
- for (i = 0; i < ac; i++) {
- if (i)
- buffer_append(&command, " ", 1);
- buffer_append(&command, av[i], strlen(av[i]));
- }
- }
-
- /* Cannot fork to background if no command. */
- if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag)
- fatal("Cannot fork into background without a command to execute.");
-
- /* Allocate a tty by default if no command specified. */
- if (buffer_len(&command) == 0)
- tty_flag = 1;
-
- /* Force no tty */
- if (no_tty_flag)
- tty_flag = 0;
- /* Do not allocate a tty if stdin is not a tty. */
- if ((!isatty(fileno(stdin)) || stdin_null_flag) && !force_tty_flag) {
- if (tty_flag)
- logit("Pseudo-terminal will not be allocated because stdin is not a terminal.");
- tty_flag = 0;
- }
-
- /*
- * Initialize "log" output. Since we are the client all output
- * actually goes to stderr.
- */
- log_init(av[0], options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level,
- SYSLOG_FACILITY_USER, 1);
-
- /*
- * Read per-user configuration file. Ignore the system wide config
- * file if the user specifies a config file on the command line.
- */
- if (config != NULL) {
- if (!read_config_file(config, host, &options, 0))
- fatal("Can't open user config file %.100s: "
- "%.100s", config, strerror(errno));
- } else {
- snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir,
- _PATH_SSH_USER_CONFFILE);
- (void)read_config_file(buf, host, &options, 1);
-
- /* Read systemwide configuration file after use config. */
- (void)read_config_file(_PATH_HOST_CONFIG_FILE, host,
- &options, 0);
- }
-
- /* Fill configuration defaults. */
- fill_default_options(&options);
-
- channel_set_af(options.address_family);
-
- /* reinit */
- log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 1);
-
- seed_rng();
-
- if (options.user == NULL)
- options.user = xstrdup(pw->pw_name);
-
- if (options.hostname != NULL)
- host = options.hostname;
-
- /* force lowercase for hostkey matching */
- if (options.host_key_alias != NULL) {
- for (p = options.host_key_alias; *p; p++)
- if (isupper(*p))
- *p = (char)tolower(*p);
- }
-
- /* Get default port if port has not been set. */
- if (options.port == 0) {
- sp = getservbyname(SSH_SERVICE_NAME, "tcp");
- options.port = sp ? ntohs(sp->s_port) : SSH_DEFAULT_PORT;
- }
-
- if (options.proxy_command != NULL &&
- strcmp(options.proxy_command, "none") == 0)
- options.proxy_command = NULL;
- if (options.control_path != NULL &&
- strcmp(options.control_path, "none") == 0)
- options.control_path = NULL;
-
- if (options.control_path != NULL) {
- char thishost[NI_MAXHOST];
-
- if (gethostname(thishost, sizeof(thishost)) == -1)
- fatal("gethostname: %s", strerror(errno));
- snprintf(buf, sizeof(buf), "%d", options.port);
- cp = tilde_expand_filename(options.control_path,
- original_real_uid);
- options.control_path = percent_expand(cp, "p", buf, "h", host,
- "r", options.user, "l", thishost, (char *)NULL);
- xfree(cp);
- }
- if (mux_command != 0 && options.control_path == NULL)
- fatal("No ControlPath specified for \"-O\" command");
- if (options.control_path != NULL)
- control_client(options.control_path);
-
- /* Open a connection to the remote host. */
- if (ssh_connect(host, &hostaddr, options.port,
- options.address_family, options.connection_attempts,
-#ifdef HAVE_CYGWIN
- options.use_privileged_port,
-#else
- original_effective_uid == 0 && options.use_privileged_port,
-#endif
- options.proxy_command) != 0)
- exit(255);
-
- /*
- * If we successfully made the connection, load the host private key
- * in case we will need it later for combined rsa-rhosts
- * authentication. This must be done before releasing extra
- * privileges, because the file is only readable by root.
- * If we cannot access the private keys, load the public keys
- * instead and try to execute the ssh-keysign helper instead.
- */
- sensitive_data.nkeys = 0;
- sensitive_data.keys = NULL;
- sensitive_data.external_keysign = 0;
- if (options.rhosts_rsa_authentication ||
- options.hostbased_authentication) {
- sensitive_data.nkeys = 3;
- sensitive_data.keys = xcalloc(sensitive_data.nkeys,
- sizeof(Key));
-
- PRIV_START;
- sensitive_data.keys[0] = key_load_private_type(KEY_RSA1,
- _PATH_HOST_KEY_FILE, "", NULL, NULL);
- sensitive_data.keys[1] = key_load_private_type(KEY_DSA,
- _PATH_HOST_DSA_KEY_FILE, "", NULL, NULL);
- sensitive_data.keys[2] = key_load_private_type(KEY_RSA,
- _PATH_HOST_RSA_KEY_FILE, "", NULL, NULL);
- PRIV_END;
-
- if (options.hostbased_authentication == 1 &&
- sensitive_data.keys[0] == NULL &&
- sensitive_data.keys[1] == NULL &&
- sensitive_data.keys[2] == NULL) {
- sensitive_data.keys[1] = key_load_public(
- _PATH_HOST_DSA_KEY_FILE, NULL);
- sensitive_data.keys[2] = key_load_public(
- _PATH_HOST_RSA_KEY_FILE, NULL);
- sensitive_data.external_keysign = 1;
- }
- }
- /*
- * Get rid of any extra privileges that we may have. We will no
- * longer need them. Also, extra privileges could make it very hard
- * to read identity files and other non-world-readable files from the
- * user's home directory if it happens to be on a NFS volume where
- * root is mapped to nobody.
- */
- if (original_effective_uid == 0) {
- PRIV_START;
- permanently_set_uid(pw);
- }
-
- /*
- * Now that we are back to our own permissions, create ~/.ssh
- * directory if it doesn't already exist.
- */
- snprintf(buf, sizeof buf, "%.100s%s%.100s", pw->pw_dir, strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR);
- if (stat(buf, &st) < 0)
- if (mkdir(buf, 0700) < 0)
- error("Could not create directory '%.200s'.", buf);
-
- /* load options.identity_files */
- load_public_identity_files();
-
- /* Expand ~ in known host file names. */
- /* XXX mem-leaks: */
- options.system_hostfile =
- tilde_expand_filename(options.system_hostfile, original_real_uid);
- options.user_hostfile =
- tilde_expand_filename(options.user_hostfile, original_real_uid);
- options.system_hostfile2 =
- tilde_expand_filename(options.system_hostfile2, original_real_uid);
- options.user_hostfile2 =
- tilde_expand_filename(options.user_hostfile2, original_real_uid);
-
- signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
-
- /* Log into the remote system. This never returns if the login fails. */
- ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr, pw);
-
- /* We no longer need the private host keys. Clear them now. */
- if (sensitive_data.nkeys != 0) {
- for (i = 0; i < sensitive_data.nkeys; i++) {
- if (sensitive_data.keys[i] != NULL) {
- /* Destroys contents safely */
- debug3("clear hostkey %d", i);
- key_free(sensitive_data.keys[i]);
- sensitive_data.keys[i] = NULL;
- }
- }
- xfree(sensitive_data.keys);
- }
- for (i = 0; i < options.num_identity_files; i++) {
- if (options.identity_files[i]) {
- xfree(options.identity_files[i]);
- options.identity_files[i] = NULL;
- }
- if (options.identity_keys[i]) {
- key_free(options.identity_keys[i]);
- options.identity_keys[i] = NULL;
- }
- }
-
- exit_status = compat20 ? ssh_session2() : ssh_session();
- packet_close();
-
- if (options.control_path != NULL && control_fd != -1)
- unlink(options.control_path);
-
- /*
- * Send SIGHUP to proxy command if used. We don't wait() in
- * case it hangs and instead rely on init to reap the child
- */
- if (proxy_command_pid > 1)
- kill(proxy_command_pid, SIGHUP);
-
- return exit_status;
-}
-
-static void
-ssh_init_forwarding(void)
-{
- int success = 0;
- int i;
-
- /* Initiate local TCP/IP port forwardings. */
- for (i = 0; i < options.num_local_forwards; i++) {
- debug("Local connections to %.200s:%d forwarded to remote "
- "address %.200s:%d",
- (options.local_forwards[i].listen_host == NULL) ?
- (options.gateway_ports ? "*" : "LOCALHOST") :
- options.local_forwards[i].listen_host,
- options.local_forwards[i].listen_port,
- options.local_forwards[i].connect_host,
- options.local_forwards[i].connect_port);
- success += channel_setup_local_fwd_listener(
- options.local_forwards[i].listen_host,
- options.local_forwards[i].listen_port,
- options.local_forwards[i].connect_host,
- options.local_forwards[i].connect_port,
- options.gateway_ports);
- }
- if (i > 0 && success != i && options.exit_on_forward_failure)
- fatal("Could not request local forwarding.");
- if (i > 0 && success == 0)
- error("Could not request local forwarding.");
-
- /* Initiate remote TCP/IP port forwardings. */
- for (i = 0; i < options.num_remote_forwards; i++) {
- debug("Remote connections from %.200s:%d forwarded to "
- "local address %.200s:%d",
- (options.remote_forwards[i].listen_host == NULL) ?
- "LOCALHOST" : options.remote_forwards[i].listen_host,
- options.remote_forwards[i].listen_port,
- options.remote_forwards[i].connect_host,
- options.remote_forwards[i].connect_port);
- if (channel_request_remote_forwarding(
- options.remote_forwards[i].listen_host,
- options.remote_forwards[i].listen_port,
- options.remote_forwards[i].connect_host,
- options.remote_forwards[i].connect_port) < 0) {
- if (options.exit_on_forward_failure)
- fatal("Could not request remote forwarding.");
- else
- logit("Warning: Could not request remote "
- "forwarding.");
- }
- }
-}
-
-static void
-check_agent_present(void)
-{
- if (options.forward_agent) {
- /* Clear agent forwarding if we don't have an agent. */
- if (!ssh_agent_present())
- options.forward_agent = 0;
- }
-}
-
-static int
-ssh_session(void)
-{
- int type;
- int interactive = 0;
- int have_tty = 0;
- struct winsize ws;
- char *cp;
- const char *display;
-
- /* Enable compression if requested. */
- if (options.compression) {
- debug("Requesting compression at level %d.", options.compression_level);
-
- if (options.compression_level < 1 || options.compression_level > 9)
- fatal("Compression level must be from 1 (fast) to 9 (slow, best).");
-
- /* Send the request. */
- packet_start(SSH_CMSG_REQUEST_COMPRESSION);
- packet_put_int(options.compression_level);
- packet_send();
- packet_write_wait();
- type = packet_read();
- if (type == SSH_SMSG_SUCCESS)
- packet_start_compression(options.compression_level);
- else if (type == SSH_SMSG_FAILURE)
- logit("Warning: Remote host refused compression.");
- else
- packet_disconnect("Protocol error waiting for compression response.");
- }
- /* Allocate a pseudo tty if appropriate. */
- if (tty_flag) {
- debug("Requesting pty.");
-
- /* Start the packet. */
- packet_start(SSH_CMSG_REQUEST_PTY);
-
- /* Store TERM in the packet. There is no limit on the
- length of the string. */
- cp = getenv("TERM");
- if (!cp)
- cp = "";
- packet_put_cstring(cp);
-
- /* Store window size in the packet. */
- if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
- memset(&ws, 0, sizeof(ws));
- packet_put_int((u_int)ws.ws_row);
- packet_put_int((u_int)ws.ws_col);
- packet_put_int((u_int)ws.ws_xpixel);
- packet_put_int((u_int)ws.ws_ypixel);
-
- /* Store tty modes in the packet. */
- tty_make_modes(fileno(stdin), NULL);
-
- /* Send the packet, and wait for it to leave. */
- packet_send();
- packet_write_wait();
-
- /* Read response from the server. */
- type = packet_read();
- if (type == SSH_SMSG_SUCCESS) {
- interactive = 1;
- have_tty = 1;
- } else if (type == SSH_SMSG_FAILURE)
- logit("Warning: Remote host failed or refused to allocate a pseudo tty.");
- else
- packet_disconnect("Protocol error waiting for pty request response.");
- }
- /* Request X11 forwarding if enabled and DISPLAY is set. */
- display = getenv("DISPLAY");
- if (options.forward_x11 && display != NULL) {
- char *proto, *data;
- /* Get reasonable local authentication information. */
- client_x11_get_proto(display, options.xauth_location,
- options.forward_x11_trusted, &proto, &data);
- /* Request forwarding with authentication spoofing. */
- debug("Requesting X11 forwarding with authentication spoofing.");
- x11_request_forwarding_with_spoofing(0, display, proto, data);
-
- /* Read response from the server. */
- type = packet_read();
- if (type == SSH_SMSG_SUCCESS) {
- interactive = 1;
- } else if (type == SSH_SMSG_FAILURE) {
- logit("Warning: Remote host denied X11 forwarding.");
- } else {
- packet_disconnect("Protocol error waiting for X11 forwarding");
- }
- }
- /* Tell the packet module whether this is an interactive session. */
- packet_set_interactive(interactive);
-
- /* Request authentication agent forwarding if appropriate. */
- check_agent_present();
-
- if (options.forward_agent) {
- debug("Requesting authentication agent forwarding.");
- auth_request_forwarding();
-
- /* Read response from the server. */
- type = packet_read();
- packet_check_eom();
- if (type != SSH_SMSG_SUCCESS)
- logit("Warning: Remote host denied authentication agent forwarding.");
- }
-
- /* Initiate port forwardings. */
- ssh_init_forwarding();
-
- /* If requested, let ssh continue in the background. */
- if (fork_after_authentication_flag)
- if (daemon(1, 1) < 0)
- fatal("daemon() failed: %.200s", strerror(errno));
-
- /*
- * If a command was specified on the command line, execute the
- * command now. Otherwise request the server to start a shell.
- */
- if (buffer_len(&command) > 0) {
- int len = buffer_len(&command);
- if (len > 900)
- len = 900;
- debug("Sending command: %.*s", len, (u_char *)buffer_ptr(&command));
- packet_start(SSH_CMSG_EXEC_CMD);
- packet_put_string(buffer_ptr(&command), buffer_len(&command));
- packet_send();
- packet_write_wait();
- } else {
- debug("Requesting shell.");
- packet_start(SSH_CMSG_EXEC_SHELL);
- packet_send();
- packet_write_wait();
- }
-
- /* Enter the interactive session. */
- return client_loop(have_tty, tty_flag ?
- options.escape_char : SSH_ESCAPECHAR_NONE, 0);
-}
-
-static void
-ssh_subsystem_reply(int type, u_int32_t seq, void *ctxt)
-{
- int id, len;
-
- id = packet_get_int();
- len = buffer_len(&command);
- if (len > 900)
- len = 900;
- packet_check_eom();
- if (type == SSH2_MSG_CHANNEL_FAILURE)
- fatal("Request for subsystem '%.*s' failed on channel %d",
- len, (u_char *)buffer_ptr(&command), id);
-}
-
-void
-client_global_request_reply_fwd(int type, u_int32_t seq, void *ctxt)
-{
- int i;
-
- i = client_global_request_id++;
- if (i >= options.num_remote_forwards)
- return;
- debug("remote forward %s for: listen %d, connect %s:%d",
- type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
- options.remote_forwards[i].listen_port,
- options.remote_forwards[i].connect_host,
- options.remote_forwards[i].connect_port);
- if (type == SSH2_MSG_REQUEST_FAILURE) {
- if (options.exit_on_forward_failure)
- fatal("Error: remote port forwarding failed for "
- "listen port %d",
- options.remote_forwards[i].listen_port);
- else
- logit("Warning: remote port forwarding failed for "
- "listen port %d",
- options.remote_forwards[i].listen_port);
- }
-}
-
-static void
-ssh_control_listener(void)
-{
- struct sockaddr_un addr;
- mode_t old_umask;
- int addr_len;
-
- if (options.control_path == NULL ||
- options.control_master == SSHCTL_MASTER_NO)
- return;
-
- debug("setting up multiplex master socket");
-
- memset(&addr, '\0', sizeof(addr));
- addr.sun_family = AF_UNIX;
- addr_len = offsetof(struct sockaddr_un, sun_path) +
- strlen(options.control_path) + 1;
-
- if (strlcpy(addr.sun_path, options.control_path,
- sizeof(addr.sun_path)) >= sizeof(addr.sun_path))
- fatal("ControlPath too long");
-
- if ((control_fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0)
- fatal("%s socket(): %s", __func__, strerror(errno));
-
- old_umask = umask(0177);
- if (bind(control_fd, (struct sockaddr *)&addr, addr_len) == -1) {
- control_fd = -1;
- if (errno == EINVAL || errno == EADDRINUSE)
- fatal("ControlSocket %s already exists",
- options.control_path);
- else
- fatal("%s bind(): %s", __func__, strerror(errno));
- }
- umask(old_umask);
-
- if (listen(control_fd, 64) == -1)
- fatal("%s listen(): %s", __func__, strerror(errno));
-
- set_nonblock(control_fd);
-}
-
-/* request pty/x11/agent/tcpfwd/shell for channel */
-static void
-ssh_session2_setup(int id, void *arg)
-{
- extern char **environ;
- const char *display;
- int interactive = tty_flag;
-
- display = getenv("DISPLAY");
- if (options.forward_x11 && display != NULL) {
- char *proto, *data;
- /* Get reasonable local authentication information. */
- client_x11_get_proto(display, options.xauth_location,
- options.forward_x11_trusted, &proto, &data);
- /* Request forwarding with authentication spoofing. */
- debug("Requesting X11 forwarding with authentication spoofing.");
- x11_request_forwarding_with_spoofing(id, display, proto, data);
- interactive = 1;
- /* XXX wait for reply */
- }
-
- check_agent_present();
- if (options.forward_agent) {
- debug("Requesting authentication agent forwarding.");
- channel_request_start(id, "auth-agent-req@openssh.com", 0);
- packet_send();
- }
-
- if (options.tun_open != SSH_TUNMODE_NO) {
- Channel *c;
- int fd;
-
- debug("Requesting tun.");
- if ((fd = tun_open(options.tun_local,
- options.tun_open)) >= 0) {
- c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1,
- CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT,
- 0, "tun", 1);
- c->datagram = 1;
-#if defined(SSH_TUN_FILTER)
- if (options.tun_open == SSH_TUNMODE_POINTOPOINT)
- channel_register_filter(c->self, sys_tun_infilter,
- sys_tun_outfilter);
-#endif
- packet_start(SSH2_MSG_CHANNEL_OPEN);
- packet_put_cstring("tun@openssh.com");
- packet_put_int(c->self);
- packet_put_int(c->local_window_max);
- packet_put_int(c->local_maxpacket);
- packet_put_int(options.tun_open);
- packet_put_int(options.tun_remote);
- packet_send();
- }
- }
-
- client_session2_setup(id, tty_flag, subsystem_flag, getenv("TERM"),
- NULL, fileno(stdin), &command, environ, &ssh_subsystem_reply);
-
- packet_set_interactive(interactive);
-}
-
-/* open new channel for a session */
-static int
-ssh_session2_open(void)
-{
- Channel *c;
- int window, packetmax, in, out, err;
-
- if (stdin_null_flag) {
- in = open(_PATH_DEVNULL, O_RDONLY);
- } else {
- in = dup(STDIN_FILENO);
- }
- out = dup(STDOUT_FILENO);
- err = dup(STDERR_FILENO);
-
- if (in < 0 || out < 0 || err < 0)
- fatal("dup() in/out/err failed");
-
- /* enable nonblocking unless tty */
- if (!isatty(in))
- set_nonblock(in);
- if (!isatty(out))
- set_nonblock(out);
- if (!isatty(err))
- set_nonblock(err);
-
- window = CHAN_SES_WINDOW_DEFAULT;
- packetmax = CHAN_SES_PACKET_DEFAULT;
- if (tty_flag) {
- window >>= 1;
- packetmax >>= 1;
- }
- c = channel_new(
- "session", SSH_CHANNEL_OPENING, in, out, err,
- window, packetmax, CHAN_EXTENDED_WRITE,
- "client-session", /*nonblock*/0);
-
- debug3("ssh_session2_open: channel_new: %d", c->self);
-
- channel_send_open(c->self);
- if (!no_shell_flag)
- channel_register_confirm(c->self, ssh_session2_setup, NULL);
-
- return c->self;
-}
-
-static int
-ssh_session2(void)
-{
- int id = -1;
-
- /* XXX should be pre-session */
- ssh_init_forwarding();
- ssh_control_listener();
-
- if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN))
- id = ssh_session2_open();
-
- /* Execute a local command */
- if (options.local_command != NULL &&
- options.permit_local_command)
- ssh_local_cmd(options.local_command);
-
- /* If requested, let ssh continue in the background. */
- if (fork_after_authentication_flag)
- if (daemon(1, 1) < 0)
- fatal("daemon() failed: %.200s", strerror(errno));
-
- return client_loop(tty_flag, tty_flag ?
- options.escape_char : SSH_ESCAPECHAR_NONE, id);
-}
-
-static void
-load_public_identity_files(void)
-{
- char *filename, *cp, thishost[NI_MAXHOST];
- int i = 0;
- Key *public;
- struct passwd *pw;
-#ifdef SMARTCARD
- Key **keys;
-
- if (options.smartcard_device != NULL &&
- options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
- (keys = sc_get_keys(options.smartcard_device, NULL)) != NULL) {
- int count = 0;
- for (i = 0; keys[i] != NULL; i++) {
- count++;
- memmove(&options.identity_files[1], &options.identity_files[0],
- sizeof(char *) * (SSH_MAX_IDENTITY_FILES - 1));
- memmove(&options.identity_keys[1], &options.identity_keys[0],
- sizeof(Key *) * (SSH_MAX_IDENTITY_FILES - 1));
- options.num_identity_files++;
- options.identity_keys[0] = keys[i];
- options.identity_files[0] = sc_get_key_label(keys[i]);
- }
- if (options.num_identity_files > SSH_MAX_IDENTITY_FILES)
- options.num_identity_files = SSH_MAX_IDENTITY_FILES;
- i = count;
- xfree(keys);
- }
-#endif /* SMARTCARD */
- if ((pw = getpwuid(original_real_uid)) == NULL)
- fatal("load_public_identity_files: getpwuid failed");
- if (gethostname(thishost, sizeof(thishost)) == -1)
- fatal("load_public_identity_files: gethostname: %s",
- strerror(errno));
- for (; i < options.num_identity_files; i++) {
- cp = tilde_expand_filename(options.identity_files[i],
- original_real_uid);
- filename = percent_expand(cp, "d", pw->pw_dir,
- "u", pw->pw_name, "l", thishost, "h", host,
- "r", options.user, (char *)NULL);
- xfree(cp);
- public = key_load_public(filename, NULL);
- debug("identity file %s type %d", filename,
- public ? public->type : -1);
- xfree(options.identity_files[i]);
- options.identity_files[i] = filename;
- options.identity_keys[i] = public;
- }
-}
-
-static void
-control_client_sighandler(int signo)
-{
- control_client_terminate = signo;
-}
-
-static void
-control_client_sigrelay(int signo)
-{
- if (control_server_pid > 1)
- kill(control_server_pid, signo);
-}
-
-static int
-env_permitted(char *env)
-{
- int i, ret;
- char name[1024], *cp;
-
- if ((cp = strchr(env, '=')) == NULL || cp == env)
- return (0);
- ret = snprintf(name, sizeof(name), "%.*s", (int)(cp - env), env);
- if (ret <= 0 || (size_t)ret >= sizeof(name))
- fatal("env_permitted: name '%.100s...' too long", env);
-
- for (i = 0; i < options.num_send_env; i++)
- if (match_pattern(name, options.send_env[i]))
- return (1);
-
- return (0);
-}
-
-static void
-control_client(const char *path)
-{
- struct sockaddr_un addr;
- int i, r, fd, sock, exitval, num_env, addr_len;
- Buffer m;
- char *term;
- extern char **environ;
- u_int flags;
-
- if (mux_command == 0)
- mux_command = SSHMUX_COMMAND_OPEN;
-
- switch (options.control_master) {
- case SSHCTL_MASTER_AUTO:
- case SSHCTL_MASTER_AUTO_ASK:
- debug("auto-mux: Trying existing master");
- /* FALLTHROUGH */
- case SSHCTL_MASTER_NO:
- break;
- default:
- return;
- }
-
- memset(&addr, '\0', sizeof(addr));
- addr.sun_family = AF_UNIX;
- addr_len = offsetof(struct sockaddr_un, sun_path) +
- strlen(path) + 1;
-
- if (strlcpy(addr.sun_path, path,
- sizeof(addr.sun_path)) >= sizeof(addr.sun_path))
- fatal("ControlPath too long");
-
- if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) < 0)
- fatal("%s socket(): %s", __func__, strerror(errno));
-
- if (connect(sock, (struct sockaddr *)&addr, addr_len) == -1) {
- if (mux_command != SSHMUX_COMMAND_OPEN) {
- fatal("Control socket connect(%.100s): %s", path,
- strerror(errno));
- }
- if (errno == ENOENT)
- debug("Control socket \"%.100s\" does not exist", path);
- else {
- error("Control socket connect(%.100s): %s", path,
- strerror(errno));
- }
- close(sock);
- return;
- }
-
- if (stdin_null_flag) {
- if ((fd = open(_PATH_DEVNULL, O_RDONLY)) == -1)
- fatal("open(/dev/null): %s", strerror(errno));
- if (dup2(fd, STDIN_FILENO) == -1)
- fatal("dup2: %s", strerror(errno));
- if (fd > STDERR_FILENO)
- close(fd);
- }
-
- term = getenv("TERM");
-
- flags = 0;
- if (tty_flag)
- flags |= SSHMUX_FLAG_TTY;
- if (subsystem_flag)
- flags |= SSHMUX_FLAG_SUBSYS;
- if (options.forward_x11)
- flags |= SSHMUX_FLAG_X11_FWD;
- if (options.forward_agent)
- flags |= SSHMUX_FLAG_AGENT_FWD;
-
- buffer_init(&m);
-
- /* Send our command to server */
- buffer_put_int(&m, mux_command);
- buffer_put_int(&m, flags);
- if (ssh_msg_send(sock, SSHMUX_VER, &m) == -1)
- fatal("%s: msg_send", __func__);
- buffer_clear(&m);
-
- /* Get authorisation status and PID of controlee */
- if (ssh_msg_recv(sock, &m) == -1)
- fatal("%s: msg_recv", __func__);
- if (buffer_get_char(&m) != SSHMUX_VER)
- fatal("%s: wrong version", __func__);
- if (buffer_get_int(&m) != 1)
- fatal("Connection to master denied");
- control_server_pid = buffer_get_int(&m);
-
- buffer_clear(&m);
-
- switch (mux_command) {
- case SSHMUX_COMMAND_ALIVE_CHECK:
- fprintf(stderr, "Master running (pid=%d)\r\n",
- control_server_pid);
- exit(0);
- case SSHMUX_COMMAND_TERMINATE:
- fprintf(stderr, "Exit request sent.\r\n");
- exit(0);
- case SSHMUX_COMMAND_OPEN:
- /* continue below */
- break;
- default:
- fatal("silly mux_command %d", mux_command);
- }
-
- /* SSHMUX_COMMAND_OPEN */
- buffer_put_cstring(&m, term ? term : "");
- buffer_append(&command, "\0", 1);
- buffer_put_cstring(&m, buffer_ptr(&command));
-
- if (options.num_send_env == 0 || environ == NULL) {
- buffer_put_int(&m, 0);
- } else {
- /* Pass environment */
- num_env = 0;
- for (i = 0; environ[i] != NULL; i++)
- if (env_permitted(environ[i]))
- num_env++; /* Count */
-
- buffer_put_int(&m, num_env);
-
- for (i = 0; environ[i] != NULL && num_env >= 0; i++)
- if (env_permitted(environ[i])) {
- num_env--;
- buffer_put_cstring(&m, environ[i]);
- }
- }
-
- if (ssh_msg_send(sock, SSHMUX_VER, &m) == -1)
- fatal("%s: msg_send", __func__);
-
- mm_send_fd(sock, STDIN_FILENO);
- mm_send_fd(sock, STDOUT_FILENO);
- mm_send_fd(sock, STDERR_FILENO);
-
- /* Wait for reply, so master has a chance to gather ttymodes */
- buffer_clear(&m);
- if (ssh_msg_recv(sock, &m) == -1)
- fatal("%s: msg_recv", __func__);
- if (buffer_get_char(&m) != SSHMUX_VER)
- fatal("%s: wrong version", __func__);
- buffer_free(&m);
-
- signal(SIGHUP, control_client_sighandler);
- signal(SIGINT, control_client_sighandler);
- signal(SIGTERM, control_client_sighandler);
- signal(SIGWINCH, control_client_sigrelay);
-
- if (tty_flag)
- enter_raw_mode();
-
- /* Stick around until the controlee closes the client_fd */
- exitval = 0;
- for (;!control_client_terminate;) {
- r = read(sock, &exitval, sizeof(exitval));
- if (r == 0) {
- debug2("Received EOF from master");
- break;
- }
- if (r > 0)
- debug2("Received exit status from master %d", exitval);
- if (r == -1 && errno != EINTR)
- fatal("%s: read %s", __func__, strerror(errno));
- }
-
- if (control_client_terminate)
- debug2("Exiting on signal %d", control_client_terminate);
-
- close(sock);
-
- leave_raw_mode();
-
- if (tty_flag && options.log_level != SYSLOG_LEVEL_QUIET)
- fprintf(stderr, "Connection to master closed.\r\n");
-
- exit(exitval);
-}
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