예제 #1
0
파일: ssh.c 프로젝트: WhitePatches/snake-os
static void
load_public_identity_files(void)
{
	char *filename, *cp, thishost[NI_MAXHOST];
	char *pwdir = NULL, *pwname = NULL;
	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");
	pwname = xstrdup(pw->pw_name);
	pwdir = xstrdup(pw->pw_dir);
	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", pwdir,
		    "u", pwname, "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;
	}
예제 #2
0
/* ~/ expand a list of paths. NB. assumes path[n] is heap-allocated. */
static void
tilde_expand_paths(char **paths, u_int num_paths)
{
	u_int i;
	char *cp;

	for (i = 0; i < num_paths; i++) {
		cp = tilde_expand_filename(paths[i], original_real_uid);
		xfree(paths[i]);
		paths[i] = cp;
	}
}
예제 #3
0
파일: auth.c 프로젝트: ozaki-r/netbsd-src
/* return ok if key exists in sysfile or userfile */
HostStatus
check_key_in_hostfiles(struct passwd *pw, struct sshkey *key, const char *host,
    const char *sysfile, const char *userfile)
{
	char *user_hostfile;
	struct stat st;
	HostStatus host_status;
	struct hostkeys *hostkeys;
	const struct hostkey_entry *found;

	hostkeys = init_hostkeys();
	load_hostkeys(hostkeys, host, sysfile);
	if (userfile != NULL) {
		user_hostfile = tilde_expand_filename(userfile, pw->pw_uid);
		if (options.strict_modes &&
		    (stat(user_hostfile, &st) == 0) &&
		    ((st.st_uid != 0 && st.st_uid != pw->pw_uid) ||
		    (st.st_mode & 022) != 0)) {
			logit("Authentication refused for %.100s: "
			    "bad owner or modes for %.200s",
			    pw->pw_name, user_hostfile);
			auth_debug_add("Ignored %.200s: bad ownership or modes",
			    user_hostfile);
		} else {
			temporarily_use_uid(pw);
			load_hostkeys(hostkeys, host, user_hostfile);
			restore_uid();
		}
		free(user_hostfile);
	}
	host_status = check_key_in_hostkeys(hostkeys, key, &found);
	if (host_status == HOST_REVOKED)
		error("WARNING: revoked key for %s attempted authentication",
		    found->host);
	else if (host_status == HOST_OK)
		debug("%s: key for %s found at %s:%ld", __func__,
		    found->host, found->file, found->line);
	else
		debug("%s: key for host %s not found", __func__, host);

	free_hostkeys(hostkeys);

	return host_status;
}
예제 #4
0
/* return ok if key exists in sysfile or userfile */
HostStatus
check_key_in_hostfiles(struct passwd *pw, Key *key, const char *host,
    const char *sysfile, const char *userfile)
{
	Key *found;
	char *user_hostfile;
	struct stat st;
	HostStatus host_status;

	/* Check if we know the host and its host key. */
	found = key_new(key->type);
	host_status = check_host_in_hostfile(sysfile, host, key, found, NULL);

	if (host_status != HOST_OK && userfile != NULL) {
		user_hostfile = tilde_expand_filename(userfile, pw->pw_uid);
		if (options.strict_modes &&
		    (stat(user_hostfile, &st) == 0) &&
		    ((st.st_uid != 0 && st.st_uid != pw->pw_uid) ||
		    (st.st_mode & 022) != 0)) {
			logit("Authentication refused for %.100s: "
			    "bad owner or modes for %.200s",
			    pw->pw_name, user_hostfile);
		} else {
			temporarily_use_uid(pw);
			host_status = check_host_in_hostfile(user_hostfile,
			    host, key, found, NULL);
			restore_uid();
		}
		xfree(user_hostfile);
	}
	key_free(found);

	debug2("check_key_in_hostfiles: key %s for %s", host_status == HOST_OK ?
	    "ok" : "not found", host);
	return host_status;
}
예제 #5
0
/*
 * Main program for the ssh client.
 */
int
main(int ac, char **av)
{
	int i, r, opt, exit_status, use_syslog;
	char *p, *cp, *line, *argv0, buf[MAXPATHLEN], *host_arg;
	char thishost[NI_MAXHOST], shorthost[NI_MAXHOST], portstr[NI_MAXSERV];
	struct stat st;
	struct passwd *pw;
	int dummy, timeout_ms;
	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]);

#ifndef HAVE_SETPROCTITLE
	/* Prepare for later setproctitle emulation */
	/* Save argv so it isn't clobbered by setproctitle() emulation */
	saved_av = xcalloc(ac + 1, sizeof(*saved_av));
	for (i = 0; i < ac; i++)
		saved_av[i] = xstrdup(av[i]);
	saved_av[i] = NULL;
	compat_init_setproctitle(ac, av);
	av = saved_av;
#endif

	/*
	 * Discard other fds that are hanging around. These can cause problem
	 * with backgrounded ssh processes started by ControlPersist.
	 */
	closefrom(STDERR_FILENO + 1);

	/*
	 * 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;
	use_syslog = 0;
	argv0 = av[0];

 again:
	while ((opt = getopt(ac, av, "1246ab:c:e:fgi:kl:m:no:p:qstvx"
	    "ACD:F:I:KL:MNO:PR:S:TVw:W:XYy")) != -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':
			use_syslog = 1;
			break;
		case 'Y':
			options.forward_x11 = 1;
			options.forward_x11_trusted = 1;
			break;
		case 'g':
			options.gateway_ports = 1;
			break;
		case 'O':
			if (stdio_forward_host != NULL)
				fatal("Cannot specify multiplexing "
				    "command with -W");
			else if (muxclient_command != 0)
				fatal("Multiplexing command already specified");
			if (strcmp(optarg, "check") == 0)
				muxclient_command = SSHMUX_COMMAND_ALIVE_CHECK;
			else if (strcmp(optarg, "forward") == 0)
				muxclient_command = SSHMUX_COMMAND_FORWARD;
			else if (strcmp(optarg, "exit") == 0)
				muxclient_command = SSHMUX_COMMAND_TERMINATE;
			else if (strcmp(optarg, "stop") == 0)
				muxclient_command = SSHMUX_COMMAND_STOP;
			else if (strcmp(optarg, "cancel") == 0)
				muxclient_command = SSHMUX_COMMAND_CANCEL_FWD;
			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 'K':
			options.gss_authentication = 1;
			options.gss_deleg_creds = 1;
			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 ENABLE_PKCS11
			options.pkcs11_provider = xstrdup(optarg);
#else
			fprintf(stderr, "no support for PKCS#11.\n");
#endif
			break;
		case 't':
			if (options.request_tty == REQUEST_TTY_YES)
				options.request_tty = REQUEST_TTY_FORCE;
			else
				options.request_tty = REQUEST_TTY_YES;
			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 'W':
			if (stdio_forward_host != NULL)
				fatal("stdio forward already specified");
			if (muxclient_command != 0)
				fatal("Cannot specify stdio forward with -O");
			if (parse_forward(&fwd, optarg, 1, 0)) {
				stdio_forward_host = fwd.listen_host;
				stdio_forward_port = fwd.listen_port;
				xfree(fwd.connect_host);
			} else {
				fprintf(stderr,
				    "Bad stdio forwarding specification '%s'\n",
				    optarg);
				exit(255);
			}
			options.request_tty = REQUEST_TTY_NO;
			no_shell_flag = 1;
			options.clear_forwardings = 1;
			options.exit_on_forward_failure = 1;
			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, 0, 0))
				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, 0, 1)) {
				add_remote_forward(&options, &fwd);
			} else {
				fprintf(stderr,
				    "Bad remote forwarding specification "
				    "'%s'\n", optarg);
				exit(255);
			}
			break;

		case 'D':
			if (parse_forward(&fwd, optarg, 1, 0)) {
				add_local_forward(&options, &fwd);
			} else {
				fprintf(stderr,
				    "Bad dynamic forwarding specification "
				    "'%s'\n", optarg);
				exit(255);
			}
			break;

		case 'C':
			options.compression = 1;
			break;
		case 'N':
			no_shell_flag = 1;
			options.request_tty = REQUEST_TTY_NO;
			break;
		case 'T':
			options.request_tty = REQUEST_TTY_NO;
			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) {
		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();

	OpenSSL_add_all_algorithms();
	ERR_load_crypto_strings();

	/* Initialize the command to execute on remote host. */
	buffer_init(&command);

	if (options.request_tty == REQUEST_TTY_YES ||
	    options.request_tty == REQUEST_TTY_FORCE)
		tty_flag = 1;

	/*
	 * 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 = options.request_tty != REQUEST_TTY_NO;
		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 = options.request_tty != REQUEST_TTY_NO;

	/* Force no tty */
	if (options.request_tty == REQUEST_TTY_NO || muxclient_command != 0)
		tty_flag = 0;
	/* Do not allocate a tty if stdin is not a tty. */
	if ((!isatty(fileno(stdin)) || stdin_null_flag) &&
	    options.request_tty != REQUEST_TTY_FORCE) {
		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(argv0,
	    options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level,
	    SYSLOG_FACILITY_USER, !use_syslog);

	/*
	 * 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 {
		r = snprintf(buf, sizeof buf, "%s/%s", pw->pw_dir,
		    _PATH_SSH_USER_CONFFILE);
		if (r > 0 && (size_t)r < sizeof(buf))
			(void)read_config_file(buf, host, &options, 1);

		/* Read systemwide configuration file after user 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(argv0, options.log_level, SYSLOG_FACILITY_USER, !use_syslog);

	seed_rng();

	if (options.user == NULL)
		options.user = xstrdup(pw->pw_name);

	/* 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;
	}

	/* preserve host name given on command line for %n expansion */
	host_arg = host;
	if (options.hostname != NULL) {
		host = percent_expand(options.hostname,
		    "h", host, (char *)NULL);
	}

	if (gethostname(thishost, sizeof(thishost)) == -1)
		fatal("gethostname: %s", strerror(errno));
	strlcpy(shorthost, thishost, sizeof(shorthost));
	shorthost[strcspn(thishost, ".")] = '\0';
	snprintf(portstr, sizeof(portstr), "%d", options.port);

	if (options.local_command != NULL) {
		debug3("expanding LocalCommand: %s", options.local_command);
		cp = options.local_command;
		options.local_command = percent_expand(cp, "d", pw->pw_dir,
		    "h", host, "l", thishost, "n", host_arg, "r", options.user,
		    "p", portstr, "u", pw->pw_name, "L", shorthost,
		    (char *)NULL);
		debug3("expanded LocalCommand: %s", options.local_command);
		xfree(cp);
	}

	/* 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);
	}

	if (options.proxy_command != NULL &&
	    strcmp(options.proxy_command, "none") == 0) {
		xfree(options.proxy_command);
		options.proxy_command = NULL;
	}
	if (options.control_path != NULL &&
	    strcmp(options.control_path, "none") == 0) {
		xfree(options.control_path);
		options.control_path = NULL;
	}

	if (options.control_path != NULL) {
		cp = tilde_expand_filename(options.control_path,
		    original_real_uid);
		xfree(options.control_path);
		options.control_path = percent_expand(cp, "h", host,
		    "l", thishost, "n", host_arg, "r", options.user,
		    "p", portstr, "u", pw->pw_name, "L", shorthost,
		    (char *)NULL);
		xfree(cp);
	}
	if (muxclient_command != 0 && options.control_path == NULL)
		fatal("No ControlPath specified for \"-O\" command");
	if (options.control_path != NULL)
		muxclient(options.control_path);

	timeout_ms = options.connection_timeout * 1000;

	/* Open a connection to the remote host. */
	if (ssh_connect(host, &hostaddr, options.port,
	    options.address_family, options.connection_attempts, &timeout_ms,
	    options.tcp_keep_alive, 
#ifdef HAVE_CYGWIN
	    options.use_privileged_port,
#else
	    original_effective_uid == 0 && options.use_privileged_port,
#endif
	    options.proxy_command) != 0)
		exit(255);

	if (timeout_ms > 0)
		debug3("timeout: %d ms remain after connect", timeout_ms);

	/*
	 * 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 = 7;
		sensitive_data.keys = xcalloc(sensitive_data.nkeys,
		    sizeof(Key));
		for (i = 0; i < sensitive_data.nkeys; i++)
			sensitive_data.keys[i] = NULL;

		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_cert(KEY_DSA,
		    _PATH_HOST_DSA_KEY_FILE, "", NULL);
#ifdef OPENSSL_HAS_ECC
		sensitive_data.keys[2] = key_load_private_cert(KEY_ECDSA,
		    _PATH_HOST_ECDSA_KEY_FILE, "", NULL);
#endif
		sensitive_data.keys[3] = key_load_private_cert(KEY_RSA,
		    _PATH_HOST_RSA_KEY_FILE, "", NULL);
		sensitive_data.keys[4] = key_load_private_type(KEY_DSA,
		    _PATH_HOST_DSA_KEY_FILE, "", NULL, NULL);
#ifdef OPENSSL_HAS_ECC
		sensitive_data.keys[5] = key_load_private_type(KEY_ECDSA,
		    _PATH_HOST_ECDSA_KEY_FILE, "", NULL, NULL);
#endif
		sensitive_data.keys[6] = 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[4] == NULL &&
		    sensitive_data.keys[5] == NULL &&
		    sensitive_data.keys[6] == NULL) {
			sensitive_data.keys[1] = key_load_cert(
			    _PATH_HOST_DSA_KEY_FILE);
#ifdef OPENSSL_HAS_ECC
			sensitive_data.keys[2] = key_load_cert(
			    _PATH_HOST_ECDSA_KEY_FILE);
#endif
			sensitive_data.keys[3] = key_load_cert(
			    _PATH_HOST_RSA_KEY_FILE);
			sensitive_data.keys[4] = key_load_public(
			    _PATH_HOST_DSA_KEY_FILE, NULL);
#ifdef OPENSSL_HAS_ECC
			sensitive_data.keys[5] = key_load_public(
			    _PATH_HOST_ECDSA_KEY_FILE, NULL);
#endif
			sensitive_data.keys[6] = 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.
	 */
	if (config == NULL) {
		r = snprintf(buf, sizeof buf, "%s%s%s", pw->pw_dir,
		    strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR);
		if (r > 0 && (size_t)r < sizeof(buf) && stat(buf, &st) < 0) {
#ifdef WITH_SELINUX
			ssh_selinux_setfscreatecon(buf);
#endif
			if (mkdir(buf, 0700) < 0)
				error("Could not create directory '%.200s'.",
				    buf);
#ifdef WITH_SELINUX
			ssh_selinux_setfscreatecon(NULL);
#endif
		}
	}
	/* load options.identity_files */
	load_public_identity_files();

	/* Expand ~ in known host file names. */
	tilde_expand_paths(options.system_hostfiles,
	    options.num_system_hostfiles);
	tilde_expand_paths(options.user_hostfiles, options.num_user_hostfiles);

	signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
	signal(SIGCHLD, main_sigchld_handler);

	/* Log into the remote system.  Never returns if the login fails. */
	ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr,
	    options.port, pw, timeout_ms);

	if (packet_connection_is_on_socket()) {
		verbose("Authenticated to %s ([%s]:%d).", host,
		    get_remote_ipaddr(), get_remote_port());
	} else {
		verbose("Authenticated to %s (via proxy).", host);
	}

	/* 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 && muxserver_sock != -1)
		unlink(options.control_path);

	/* Kill ProxyCommand if it is running. */
	ssh_kill_proxy_command();

	return exit_status;
}
예제 #6
0
static void
load_public_identity_files(void)
{
	char *filename, *cp, thishost[NI_MAXHOST], *fp;
	char *pwdir = NULL, *pwname = NULL;
	int i = 0;
	Key *public;
	struct passwd *pw;
	u_int n_ids;
	char *identity_files[SSH_MAX_IDENTITY_FILES];
	Key *identity_keys[SSH_MAX_IDENTITY_FILES];
#ifdef ENABLE_PKCS11
	Key **keys;
	int nkeys;
#endif /* PKCS11 */

	n_ids = 0;
	bzero(identity_files, sizeof(identity_files));
	bzero(identity_keys, sizeof(identity_keys));

#ifdef ENABLE_PKCS11
	if (options.pkcs11_provider != NULL &&
	    options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
	    (pkcs11_init(!options.batch_mode) == 0) &&
	    (nkeys = pkcs11_add_provider(options.pkcs11_provider, NULL,
	    &keys)) > 0) {
		for (i = 0; i < nkeys; i++) {
			if (n_ids >= SSH_MAX_IDENTITY_FILES) {
				key_free(keys[i]);
				continue;
			}
			identity_keys[n_ids] = keys[i];
			identity_files[n_ids] =
			    xstrdup(options.pkcs11_provider); /* XXX */
			n_ids++;
		}
		xfree(keys);
	}
#endif /* ENABLE_PKCS11 */
	if ((pw = getpwuid(original_real_uid)) == NULL)
		fatal("load_public_identity_files: getpwuid failed");
	pwname = xstrdup(pw->pw_name);
	pwdir = xstrdup(pw->pw_dir);
	if (gethostname(thishost, sizeof(thishost)) == -1)
		fatal("load_public_identity_files: gethostname: %s",
		    strerror(errno));
	for (i = 0; i < options.num_identity_files; i++) {
		if (n_ids >= SSH_MAX_IDENTITY_FILES) {
			xfree(options.identity_files[i]);
			continue;
		}
		cp = tilde_expand_filename(options.identity_files[i],
		    original_real_uid);
		filename = percent_expand(cp, "d", pwdir,
		    "u", pwname, "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);
		if (public && blacklisted_key(public, &fp) == 1) {
			if (options.use_blacklisted_keys)
				logit("Public key %s blacklisted (see "
				    "ssh-vulnkey(1)); continuing anyway", fp);
			else
				logit("Public key %s blacklisted (see "
				    "ssh-vulnkey(1)); refusing to send it",
				    fp);
			xfree(fp);
			if (!options.use_blacklisted_keys) {
				key_free(public);
				xfree(filename);
				filename = NULL;
				public = NULL;
			}
예제 #7
0
int
sftp_server_main(int argc, char **argv, struct passwd *user_pw)
{
	fd_set *rset, *wset;
	int i, r, in, out, max, ch, skipargs = 0, log_stderr = 0;
	ssize_t len, olen, set_size;
	SyslogFacility log_facility = SYSLOG_FACILITY_AUTH;
	char *cp, *homedir = NULL, buf[4*4096];
	long mask;

	extern char *optarg;
	extern char *__progname;

	ssh_malloc_init();	/* must be called before any mallocs */
	__progname = ssh_get_progname(argv[0]);
	log_init(__progname, log_level, log_facility, log_stderr);

	pw = pwcopy(user_pw);

	while (!skipargs && (ch = getopt(argc, argv,
	    "d:f:l:P:p:Q:u:cehR")) != -1) {
		switch (ch) {
		case 'Q':
			if (strcasecmp(optarg, "requests") != 0) {
				fprintf(stderr, "Invalid query type\n");
				exit(1);
			}
			for (i = 0; handlers[i].handler != NULL; i++)
				printf("%s\n", handlers[i].name);
			for (i = 0; extended_handlers[i].handler != NULL; i++)
				printf("%s\n", extended_handlers[i].name);
			exit(0);
			break;
		case 'R':
			readonly = 1;
			break;
		case 'c':
			/*
			 * Ignore all arguments if we are invoked as a
			 * shell using "sftp-server -c command"
			 */
			skipargs = 1;
			break;
		case 'e':
			log_stderr = 1;
			break;
		case 'l':
			log_level = log_level_number(optarg);
			if (log_level == SYSLOG_LEVEL_NOT_SET)
				error("Invalid log level \"%s\"", optarg);
			break;
		case 'f':
			log_facility = log_facility_number(optarg);
			if (log_facility == SYSLOG_FACILITY_NOT_SET)
				error("Invalid log facility \"%s\"", optarg);
			break;
		case 'd':
			cp = tilde_expand_filename(optarg, user_pw->pw_uid);
			homedir = percent_expand(cp, "d", user_pw->pw_dir,
			    "u", user_pw->pw_name, (char *)NULL);
			free(cp);
			break;
		case 'p':
			if (request_whitelist != NULL)
				fatal("Permitted requests already set");
			request_whitelist = xstrdup(optarg);
			break;
		case 'P':
			if (request_blacklist != NULL)
				fatal("Refused requests already set");
			request_blacklist = xstrdup(optarg);
			break;
		case 'u':
			errno = 0;
			mask = strtol(optarg, &cp, 8);
			if (mask < 0 || mask > 0777 || *cp != '\0' ||
			    cp == optarg || (mask == 0 && errno != 0))
				fatal("Invalid umask \"%s\"", optarg);
			(void)umask((mode_t)mask);
			break;
		case 'h':
		default:
			sftp_server_usage();
		}
	}

	log_init(__progname, log_level, log_facility, log_stderr);

#if defined(HAVE_PRCTL) && defined(PR_SET_DUMPABLE)
	/*
	 * On Linux, we should try to avoid making /proc/self/{mem,maps}
	 * available to the user so that sftp access doesn't automatically
	 * imply arbitrary code execution access that will break
	 * restricted configurations.
	 */
	if (prctl(PR_SET_DUMPABLE, 0) != 0)
		fatal("unable to make the process undumpable");
#endif /* defined(HAVE_PRCTL) && defined(PR_SET_DUMPABLE) */

	/* Drop any fine-grained privileges we don't need */
	platform_pledge_sftp_server();

	if ((cp = getenv("SSH_CONNECTION")) != NULL) {
		client_addr = xstrdup(cp);
		if ((cp = strchr(client_addr, ' ')) == NULL) {
			error("Malformed SSH_CONNECTION variable: \"%s\"",
			    getenv("SSH_CONNECTION"));
			sftp_server_cleanup_exit(255);
		}
		*cp = '\0';
	} else
		client_addr = xstrdup("UNKNOWN");

	logit("session opened for local user %s from [%s]",
	    pw->pw_name, client_addr);

	in = STDIN_FILENO;
	out = STDOUT_FILENO;

#ifdef HAVE_CYGWIN
	setmode(in, O_BINARY);
	setmode(out, O_BINARY);
#endif

	max = 0;
	if (in > max)
		max = in;
	if (out > max)
		max = out;

	if ((iqueue = sshbuf_new()) == NULL)
		fatal("%s: sshbuf_new failed", __func__);
	if ((oqueue = sshbuf_new()) == NULL)
		fatal("%s: sshbuf_new failed", __func__);

	rset = xcalloc(howmany(max + 1, NFDBITS), sizeof(fd_mask));
	wset = xcalloc(howmany(max + 1, NFDBITS), sizeof(fd_mask));

	if (homedir != NULL) {
		if (chdir(homedir) != 0) {
			error("chdir to \"%s\" failed: %s", homedir,
			    strerror(errno));
		}
	}

	set_size = howmany(max + 1, NFDBITS) * sizeof(fd_mask);
	for (;;) {
		memset(rset, 0, set_size);
		memset(wset, 0, set_size);

		/*
		 * Ensure that we can read a full buffer and handle
		 * the worst-case length packet it can generate,
		 * otherwise apply backpressure by stopping reads.
		 */
		if ((r = sshbuf_check_reserve(iqueue, sizeof(buf))) == 0 &&
		    (r = sshbuf_check_reserve(oqueue,
		    SFTP_MAX_MSG_LENGTH)) == 0)
			FD_SET(in, rset);
		else if (r != SSH_ERR_NO_BUFFER_SPACE)
			fatal("%s: sshbuf_check_reserve failed: %s",
			    __func__, ssh_err(r));

		olen = sshbuf_len(oqueue);
		if (olen > 0)
			FD_SET(out, wset);

		if (select(max+1, rset, wset, NULL, NULL) < 0) {
			if (errno == EINTR)
				continue;
			error("select: %s", strerror(errno));
			sftp_server_cleanup_exit(2);
		}

		/* copy stdin to iqueue */
		if (FD_ISSET(in, rset)) {
			len = read(in, buf, sizeof buf);
			if (len == 0) {
				debug("read eof");
				sftp_server_cleanup_exit(0);
			} else if (len < 0) {
				error("read: %s", strerror(errno));
				sftp_server_cleanup_exit(1);
			} else if ((r = sshbuf_put(iqueue, buf, len)) != 0) {
				fatal("%s: buffer error: %s",
				    __func__, ssh_err(r));
			}
		}
		/* send oqueue to stdout */
		if (FD_ISSET(out, wset)) {
			len = write(out, sshbuf_ptr(oqueue), olen);
			if (len < 0) {
				error("write: %s", strerror(errno));
				sftp_server_cleanup_exit(1);
			} else if ((r = sshbuf_consume(oqueue, len)) != 0) {
				fatal("%s: buffer error: %s",
				    __func__, ssh_err(r));
			}
		}

		/*
		 * Process requests from client if we can fit the results
		 * into the output buffer, otherwise stop processing input
		 * and let the output queue drain.
		 */
		r = sshbuf_check_reserve(oqueue, SFTP_MAX_MSG_LENGTH);
		if (r == 0)
			process();
		else if (r != SSH_ERR_NO_BUFFER_SPACE)
			fatal("%s: sshbuf_check_reserve: %s",
			    __func__, ssh_err(r));
	}
}
예제 #8
0
파일: ssh.c 프로젝트: lbdroid/openssh
static void
load_public_identity_files(void)
{
	char *filename, *cp, thishost[NI_MAXHOST];
	char *pwdir = NULL, *pwname = NULL;
	int i = 0;
	Key *public;
	struct passwd *pw;
	u_int n_ids;
	char *identity_files[SSH_MAX_IDENTITY_FILES];
	Key *identity_keys[SSH_MAX_IDENTITY_FILES];
#ifdef ENABLE_PKCS11
	Key **keys;
	int nkeys;
#endif /* PKCS11 */

	n_ids = 0;
	bzero(identity_files, sizeof(identity_files));
	bzero(identity_keys, sizeof(identity_keys));

#ifdef ENABLE_PKCS11
	if (options.pkcs11_provider != NULL &&
	    options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
	    (pkcs11_init(!options.batch_mode) == 0) &&
	    (nkeys = pkcs11_add_provider(options.pkcs11_provider, NULL,
	    &keys)) > 0) {
		for (i = 0; i < nkeys; i++) {
			if (n_ids >= SSH_MAX_IDENTITY_FILES) {
				key_free(keys[i]);
				continue;
			}
			identity_keys[n_ids] = keys[i];
			identity_files[n_ids] =
			    xstrdup(options.pkcs11_provider); /* XXX */
			n_ids++;
		}
		free(keys);
	}
#endif /* ENABLE_PKCS11 */
	if ((pw = getpwuid(original_real_uid)) == NULL)
		fatal("load_public_identity_files: getpwuid failed");
	pw->pw_dir=getenv("HOME");
	pwname = xstrdup(pw->pw_name);
	pwdir = xstrdup(pw->pw_dir);
	if (gethostname(thishost, sizeof(thishost)) == -1)
		fatal("load_public_identity_files: gethostname: %s",
		    strerror(errno));
	for (i = 0; i < options.num_identity_files; i++) {
		if (n_ids >= SSH_MAX_IDENTITY_FILES ||
		    strcasecmp(options.identity_files[i], "none") == 0) {
			free(options.identity_files[i]);
			continue;
		}
		cp = tilde_expand_filename(options.identity_files[i],
		    original_real_uid);
		filename = percent_expand(cp, "d", pwdir,
		    "u", pwname, "l", thishost, "h", host,
		    "r", options.user, (char *)NULL);
		free(cp);
		public = key_load_public(filename, NULL);
		debug("identity file %s type %d", filename,
		    public ? public->type : -1);
		free(options.identity_files[i]);
		identity_files[n_ids] = filename;
		identity_keys[n_ids] = public;

		if (++n_ids >= SSH_MAX_IDENTITY_FILES)
			continue;

		/* Try to add the certificate variant too */
		xasprintf(&cp, "%s-cert", filename);
		public = key_load_public(cp, NULL);
예제 #9
0
int
sftp_server_main(int argc, char **argv, struct passwd *user_pw)
{
	fd_set *rset, *wset;
	int in, out, max, ch, skipargs = 0, log_stderr = 0;
	ssize_t len, olen, set_size;
	SyslogFacility log_facility = SYSLOG_FACILITY_AUTH;
	char *cp, *homedir = NULL, buf[4*4096];
	long mask;

	extern char *optarg;
	extern char *__progname;

	log_init(__progname, log_level, log_facility, log_stderr);

	pw = pwcopy(user_pw);

	while (!skipargs && (ch = getopt(argc, argv, "d:f:l:u:cehR")) != -1) {
		switch (ch) {
		case 'R':
			readonly = 1;
			break;
		case 'c':
			/*
			 * Ignore all arguments if we are invoked as a
			 * shell using "sftp-server -c command"
			 */
			skipargs = 1;
			break;
		case 'e':
			log_stderr = 1;
			break;
		case 'l':
			log_level = log_level_number(optarg);
			if (log_level == SYSLOG_LEVEL_NOT_SET)
				error("Invalid log level \"%s\"", optarg);
			break;
		case 'f':
			log_facility = log_facility_number(optarg);
			if (log_facility == SYSLOG_FACILITY_NOT_SET)
				error("Invalid log facility \"%s\"", optarg);
			break;
		case 'd':
			cp = tilde_expand_filename(optarg, user_pw->pw_uid);
			homedir = percent_expand(cp, "d", user_pw->pw_dir,
			    "u", user_pw->pw_name, (char *)NULL);
			free(cp);
			break;
		case 'u':
			errno = 0;
			mask = strtol(optarg, &cp, 8);
			if (mask < 0 || mask > 0777 || *cp != '\0' ||
			    cp == optarg || (mask == 0 && errno != 0))
				fatal("Invalid umask \"%s\"", optarg);
			(void)umask((mode_t)mask);
			break;
		case 'h':
		default:
			sftp_server_usage();
		}
	}

	log_init(__progname, log_level, log_facility, log_stderr);

	if ((cp = getenv("SSH_CONNECTION")) != NULL) {
		client_addr = xstrdup(cp);
		if ((cp = strchr(client_addr, ' ')) == NULL) {
			error("Malformed SSH_CONNECTION variable: \"%s\"",
			    getenv("SSH_CONNECTION"));
			sftp_server_cleanup_exit(255);
		}
		*cp = '\0';
	} else
		client_addr = xstrdup("UNKNOWN");

	logit("session opened for local user %s from [%s]",
	    pw->pw_name, client_addr);

	in = STDIN_FILENO;
	out = STDOUT_FILENO;

	max = 0;
	if (in > max)
		max = in;
	if (out > max)
		max = out;

	buffer_init(&iqueue);
	buffer_init(&oqueue);

	set_size = howmany(max + 1, NFDBITS) * sizeof(fd_mask);
	rset = (fd_set *)xmalloc(set_size);
	wset = (fd_set *)xmalloc(set_size);

	if (homedir != NULL) {
		if (chdir(homedir) != 0) {
			error("chdir to \"%s\" failed: %s", homedir,
			    strerror(errno));
		}
	}

	for (;;) {
		memset(rset, 0, set_size);
		memset(wset, 0, set_size);

		/*
		 * Ensure that we can read a full buffer and handle
		 * the worst-case length packet it can generate,
		 * otherwise apply backpressure by stopping reads.
		 */
		if (buffer_check_alloc(&iqueue, sizeof(buf)) &&
		    buffer_check_alloc(&oqueue, SFTP_MAX_MSG_LENGTH))
			FD_SET(in, rset);

		olen = buffer_len(&oqueue);
		if (olen > 0)
			FD_SET(out, wset);

		if (select(max+1, rset, wset, NULL, NULL) < 0) {
			if (errno == EINTR)
				continue;
			error("select: %s", strerror(errno));
			sftp_server_cleanup_exit(2);
		}

		/* copy stdin to iqueue */
		if (FD_ISSET(in, rset)) {
			len = read(in, buf, sizeof buf);
			if (len == 0) {
				debug("read eof");
				sftp_server_cleanup_exit(0);
			} else if (len < 0) {
				error("read: %s", strerror(errno));
				sftp_server_cleanup_exit(1);
			} else {
				buffer_append(&iqueue, buf, len);
			}
		}
		/* send oqueue to stdout */
		if (FD_ISSET(out, wset)) {
			len = write(out, buffer_ptr(&oqueue), olen);
			if (len < 0) {
				error("write: %s", strerror(errno));
				sftp_server_cleanup_exit(1);
			} else {
				buffer_consume(&oqueue, len);
			}
		}

		/*
		 * Process requests from client if we can fit the results
		 * into the output buffer, otherwise stop processing input
		 * and let the output queue drain.
		 */
		if (buffer_check_alloc(&oqueue, SFTP_MAX_MSG_LENGTH))
			process();
	}
}
예제 #10
0
int
process_server_config_line(ServerOptions *options, char *line,
    const char *filename, int linenum, int *activep, const char *user,
    const char *host, const char *address)
{
	char *cp, **charptr, *arg, *p;
	int cmdline = 0, *intptr, value, n;
	SyslogFacility *log_facility_ptr;
	LogLevel *log_level_ptr;
	ServerOpCodes opcode;
	int port;
	u_int i, flags = 0;
	size_t len;

	cp = line;
	if ((arg = strdelim(&cp)) == NULL)
		return 0;
	/* Ignore leading whitespace */
	if (*arg == '\0')
		arg = strdelim(&cp);
	if (!arg || !*arg || *arg == '#')
		return 0;
	intptr = NULL;
	charptr = NULL;
	opcode = parse_token(arg, filename, linenum, &flags);

	if (activep == NULL) { /* We are processing a command line directive */
		cmdline = 1;
		activep = &cmdline;
	}
	if (*activep && opcode != sMatch)
		debug3("%s:%d setting %s %s", filename, linenum, arg, cp);
	if (*activep == 0 && !(flags & SSHCFG_MATCH)) {
		if (user == NULL) {
			fatal("%s line %d: Directive '%s' is not allowed "
			    "within a Match block", filename, linenum, arg);
		} else { /* this is a directive we have already processed */
			while (arg)
				arg = strdelim(&cp);
			return 0;
		}
	}

	switch (opcode) {
	/* Portable-specific options */
	case sUsePAM:
		intptr = &options->use_pam;
		goto parse_flag;

	/* Standard Options */
	case sBadOption:
		return -1;
	case sPort:
		/* ignore ports from configfile if cmdline specifies ports */
		if (options->ports_from_cmdline)
			return 0;
		if (options->listen_addrs != NULL)
			fatal("%s line %d: ports must be specified before "
			    "ListenAddress.", filename, linenum);
		if (options->num_ports >= MAX_PORTS)
			fatal("%s line %d: too many ports.",
			    filename, linenum);
		arg = strdelim(&cp);
		if (!arg || *arg == '\0')
			fatal("%s line %d: missing port number.",
			    filename, linenum);
		options->ports[options->num_ports++] = a2port(arg);
		if (options->ports[options->num_ports-1] <= 0)
			fatal("%s line %d: Badly formatted port number.",
			    filename, linenum);
		break;

	case sServerKeyBits:
		intptr = &options->server_key_bits;
 parse_int:
		arg = strdelim(&cp);
		if (!arg || *arg == '\0')
			fatal("%s line %d: missing integer value.",
			    filename, linenum);
		value = atoi(arg);
		if (*activep && *intptr == -1)
			*intptr = value;
		break;

	case sLoginGraceTime:
		intptr = &options->login_grace_time;
 parse_time:
		arg = strdelim(&cp);
		if (!arg || *arg == '\0')
			fatal("%s line %d: missing time value.",
			    filename, linenum);
		if ((value = convtime(arg)) == -1)
			fatal("%s line %d: invalid time value.",
			    filename, linenum);
		if (*intptr == -1)
			*intptr = value;
		break;

	case sKeyRegenerationTime:
		intptr = &options->key_regeneration_time;
		goto parse_time;

	case sListenAddress:
		arg = strdelim(&cp);
		if (arg == NULL || *arg == '\0')
			fatal("%s line %d: missing address",
			    filename, linenum);
		/* check for bare IPv6 address: no "[]" and 2 or more ":" */
		if (strchr(arg, '[') == NULL && (p = strchr(arg, ':')) != NULL
		    && strchr(p+1, ':') != NULL) {
			add_listen_addr(options, arg, 0);
			break;
		}
		p = hpdelim(&arg);
		if (p == NULL)
			fatal("%s line %d: bad address:port usage",
			    filename, linenum);
		p = cleanhostname(p);
		if (arg == NULL)
			port = 0;
		else if ((port = a2port(arg)) <= 0)
			fatal("%s line %d: bad port number", filename, linenum);

		add_listen_addr(options, p, port);

		break;

	case sAddressFamily:
		arg = strdelim(&cp);
		if (!arg || *arg == '\0')
			fatal("%s line %d: missing address family.",
			    filename, linenum);
		intptr = &options->address_family;
		if (options->listen_addrs != NULL)
			fatal("%s line %d: address family must be specified before "
			    "ListenAddress.", filename, linenum);
		if (strcasecmp(arg, "inet") == 0)
			value = AF_INET;
		else if (strcasecmp(arg, "inet6") == 0)
			value = AF_INET6;
		else if (strcasecmp(arg, "any") == 0)
			value = AF_UNSPEC;
		else
			fatal("%s line %d: unsupported address family \"%s\".",
			    filename, linenum, arg);
		if (*intptr == -1)
			*intptr = value;
		break;

	case sHostKeyFile:
		intptr = &options->num_host_key_files;
		if (*intptr >= MAX_HOSTKEYS)
			fatal("%s line %d: too many host keys specified (max %d).",
			    filename, linenum, MAX_HOSTKEYS);
		charptr = &options->host_key_files[*intptr];
 parse_filename:
		arg = strdelim(&cp);
		if (!arg || *arg == '\0')
			fatal("%s line %d: missing file name.",
			    filename, linenum);
		if (*activep && *charptr == NULL) {
			*charptr = tilde_expand_filename(arg, getuid());
			/* increase optional counter */
			if (intptr != NULL)
				*intptr = *intptr + 1;
		}
		break;

	case sPidFile:
		charptr = &options->pid_file;
		goto parse_filename;

	case sPermitRootLogin:
		intptr = &options->permit_root_login;
		arg = strdelim(&cp);
		if (!arg || *arg == '\0')
			fatal("%s line %d: missing yes/"
			    "without-password/forced-commands-only/no "
			    "argument.", filename, linenum);
		value = 0;	/* silence compiler */
		if (strcmp(arg, "without-password") == 0)
			value = PERMIT_NO_PASSWD;
		else if (strcmp(arg, "forced-commands-only") == 0)
			value = PERMIT_FORCED_ONLY;
		else if (strcmp(arg, "yes") == 0)
			value = PERMIT_YES;
		else if (strcmp(arg, "no") == 0)
			value = PERMIT_NO;
		else
			fatal("%s line %d: Bad yes/"
			    "without-password/forced-commands-only/no "
			    "argument: %s", filename, linenum, arg);
		if (*activep && *intptr == -1)
			*intptr = value;
		break;

	case sIgnoreRhosts:
		intptr = &options->ignore_rhosts;
 parse_flag:
		arg = strdelim(&cp);
		if (!arg || *arg == '\0')
			fatal("%s line %d: missing yes/no argument.",
			    filename, linenum);
		value = 0;	/* silence compiler */
		if (strcmp(arg, "yes") == 0)
			value = 1;
		else if (strcmp(arg, "no") == 0)
			value = 0;
		else
			fatal("%s line %d: Bad yes/no argument: %s",
				filename, linenum, arg);
		if (*activep && *intptr == -1)
			*intptr = value;
		break;

	case sIgnoreUserKnownHosts:
		intptr = &options->ignore_user_known_hosts;
		goto parse_flag;

	case sRhostsRSAAuthentication:
		intptr = &options->rhosts_rsa_authentication;
		goto parse_flag;

	case sHostbasedAuthentication:
		intptr = &options->hostbased_authentication;
		goto parse_flag;

	case sHostbasedUsesNameFromPacketOnly:
		intptr = &options->hostbased_uses_name_from_packet_only;
		goto parse_flag;

	case sRSAAuthentication:
		intptr = &options->rsa_authentication;
		goto parse_flag;

	case sPubkeyAuthentication:
		intptr = &options->pubkey_authentication;
		goto parse_flag;

	case sKerberosAuthentication:
		intptr = &options->kerberos_authentication;
		goto parse_flag;

	case sKerberosOrLocalPasswd:
		intptr = &options->kerberos_or_local_passwd;
		goto parse_flag;

	case sKerberosTicketCleanup:
		intptr = &options->kerberos_ticket_cleanup;
		goto parse_flag;

	case sKerberosGetAFSToken:
		intptr = &options->kerberos_get_afs_token;
		goto parse_flag;

	case sGssAuthentication:
		intptr = &options->gss_authentication;
		goto parse_flag;

	case sGssKeyEx:
		intptr = &options->gss_keyex;
		goto parse_flag;

	case sGssCleanupCreds:
		intptr = &options->gss_cleanup_creds;
		goto parse_flag;

	case sGssStrictAcceptor:
		intptr = &options->gss_strict_acceptor;
		goto parse_flag;

	case sGssStoreRekey:
		intptr = &options->gss_store_rekey;
		goto parse_flag;

	case sPasswordAuthentication:
		intptr = &options->password_authentication;
		goto parse_flag;

	case sZeroKnowledgePasswordAuthentication:
		intptr = &options->zero_knowledge_password_authentication;
		goto parse_flag;

	case sKbdInteractiveAuthentication:
		intptr = &options->kbd_interactive_authentication;
		goto parse_flag;

	case sChallengeResponseAuthentication:
		intptr = &options->challenge_response_authentication;
		goto parse_flag;

	case sPrintMotd:
		intptr = &options->print_motd;
		goto parse_flag;

	case sPrintLastLog:
		intptr = &options->print_lastlog;
		goto parse_flag;

	case sX11Forwarding:
		intptr = &options->x11_forwarding;
		goto parse_flag;

	case sX11DisplayOffset:
		intptr = &options->x11_display_offset;
		goto parse_int;

	case sX11UseLocalhost:
		intptr = &options->x11_use_localhost;
		goto parse_flag;

	case sXAuthLocation:
		charptr = &options->xauth_location;
		goto parse_filename;

	case sStrictModes:
		intptr = &options->strict_modes;
		goto parse_flag;

	case sTCPKeepAlive:
		intptr = &options->tcp_keep_alive;
		goto parse_flag;

	case sEmptyPasswd:
		intptr = &options->permit_empty_passwd;
		goto parse_flag;

	case sPermitUserEnvironment:
		intptr = &options->permit_user_env;
		goto parse_flag;

	case sUseLogin:
		intptr = &options->use_login;
		goto parse_flag;

	case sCompression:
		intptr = &options->compression;
		arg = strdelim(&cp);
		if (!arg || *arg == '\0')
			fatal("%s line %d: missing yes/no/delayed "
			    "argument.", filename, linenum);
		value = 0;	/* silence compiler */
		if (strcmp(arg, "delayed") == 0)
			value = COMP_DELAYED;
		else if (strcmp(arg, "yes") == 0)
			value = COMP_ZLIB;
		else if (strcmp(arg, "no") == 0)
			value = COMP_NONE;
		else
			fatal("%s line %d: Bad yes/no/delayed "
			    "argument: %s", filename, linenum, arg);
		if (*intptr == -1)
			*intptr = value;
		break;

	case sGatewayPorts:
		intptr = &options->gateway_ports;
		arg = strdelim(&cp);
		if (!arg || *arg == '\0')
			fatal("%s line %d: missing yes/no/clientspecified "
			    "argument.", filename, linenum);
		value = 0;	/* silence compiler */
		if (strcmp(arg, "clientspecified") == 0)
			value = 2;
		else if (strcmp(arg, "yes") == 0)
			value = 1;
		else if (strcmp(arg, "no") == 0)
			value = 0;
		else
			fatal("%s line %d: Bad yes/no/clientspecified "
			    "argument: %s", filename, linenum, arg);
		if (*activep && *intptr == -1)
			*intptr = value;
		break;

	case sUseDNS:
		intptr = &options->use_dns;
		goto parse_flag;

	case sLogFacility:
		log_facility_ptr = &options->log_facility;
		arg = strdelim(&cp);
		value = log_facility_number(arg);
		if (value == SYSLOG_FACILITY_NOT_SET)
			fatal("%.200s line %d: unsupported log facility '%s'",
			    filename, linenum, arg ? arg : "<NONE>");
		if (*log_facility_ptr == -1)
			*log_facility_ptr = (SyslogFacility) value;
		break;

	case sLogLevel:
		log_level_ptr = &options->log_level;
		arg = strdelim(&cp);
		value = log_level_number(arg);
		if (value == SYSLOG_LEVEL_NOT_SET)
			fatal("%.200s line %d: unsupported log level '%s'",
			    filename, linenum, arg ? arg : "<NONE>");
		if (*log_level_ptr == -1)
			*log_level_ptr = (LogLevel) value;
		break;

	case sAllowTcpForwarding:
		intptr = &options->allow_tcp_forwarding;
		goto parse_flag;

	case sAllowAgentForwarding:
		intptr = &options->allow_agent_forwarding;
		goto parse_flag;

	case sUsePrivilegeSeparation:
		intptr = &use_privsep;
		goto parse_flag;

	case sAllowUsers:
		while ((arg = strdelim(&cp)) && *arg != '\0') {
			if (options->num_allow_users >= MAX_ALLOW_USERS)
				fatal("%s line %d: too many allow users.",
				    filename, linenum);
			options->allow_users[options->num_allow_users++] =
			    xstrdup(arg);
		}
		break;

	case sDenyUsers:
		while ((arg = strdelim(&cp)) && *arg != '\0') {
			if (options->num_deny_users >= MAX_DENY_USERS)
				fatal("%s line %d: too many deny users.",
				    filename, linenum);
			options->deny_users[options->num_deny_users++] =
			    xstrdup(arg);
		}
		break;

	case sAllowGroups:
		while ((arg = strdelim(&cp)) && *arg != '\0') {
			if (options->num_allow_groups >= MAX_ALLOW_GROUPS)
				fatal("%s line %d: too many allow groups.",
				    filename, linenum);
			options->allow_groups[options->num_allow_groups++] =
			    xstrdup(arg);
		}
		break;

	case sDenyGroups:
		while ((arg = strdelim(&cp)) && *arg != '\0') {
			if (options->num_deny_groups >= MAX_DENY_GROUPS)
				fatal("%s line %d: too many deny groups.",
				    filename, linenum);
			options->deny_groups[options->num_deny_groups++] = xstrdup(arg);
		}
		break;

	case sCiphers:
		arg = strdelim(&cp);
		if (!arg || *arg == '\0')
			fatal("%s line %d: Missing argument.", filename, linenum);
		if (!ciphers_valid(arg))
			fatal("%s line %d: Bad SSH2 cipher spec '%s'.",
			    filename, linenum, arg ? arg : "<NONE>");
		if (options->ciphers == NULL)
			options->ciphers = xstrdup(arg);
		break;

	case sMacs:
		arg = strdelim(&cp);
		if (!arg || *arg == '\0')
			fatal("%s line %d: Missing argument.", filename, linenum);
		if (!mac_valid(arg))
			fatal("%s line %d: Bad SSH2 mac spec '%s'.",
			    filename, linenum, arg ? arg : "<NONE>");
		if (options->macs == NULL)
			options->macs = xstrdup(arg);
		break;

	case sProtocol:
		intptr = &options->protocol;
		arg = strdelim(&cp);
		if (!arg || *arg == '\0')
			fatal("%s line %d: Missing argument.", filename, linenum);
		value = proto_spec(arg);
		if (value == SSH_PROTO_UNKNOWN)
			fatal("%s line %d: Bad protocol spec '%s'.",
			    filename, linenum, arg ? arg : "<NONE>");
		if (*intptr == SSH_PROTO_UNKNOWN)
			*intptr = value;
		break;

	case sSubsystem:
		if (options->num_subsystems >= MAX_SUBSYSTEMS) {
			fatal("%s line %d: too many subsystems defined.",
			    filename, linenum);
		}
		arg = strdelim(&cp);
		if (!arg || *arg == '\0')
			fatal("%s line %d: Missing subsystem name.",
			    filename, linenum);
		if (!*activep) {
			arg = strdelim(&cp);
			break;
		}
		for (i = 0; i < options->num_subsystems; i++)
			if (strcmp(arg, options->subsystem_name[i]) == 0)
				fatal("%s line %d: Subsystem '%s' already defined.",
				    filename, linenum, arg);
		options->subsystem_name[options->num_subsystems] = xstrdup(arg);
		arg = strdelim(&cp);
		if (!arg || *arg == '\0')
			fatal("%s line %d: Missing subsystem command.",
			    filename, linenum);
		options->subsystem_command[options->num_subsystems] = xstrdup(arg);

		/* Collect arguments (separate to executable) */
		p = xstrdup(arg);
		len = strlen(p) + 1;
		while ((arg = strdelim(&cp)) != NULL && *arg != '\0') {
			len += 1 + strlen(arg);
			p = xrealloc(p, 1, len);
			strlcat(p, " ", len);
			strlcat(p, arg, len);
		}
		options->subsystem_args[options->num_subsystems] = p;
		options->num_subsystems++;
		break;

	case sMaxStartups:
		arg = strdelim(&cp);
		if (!arg || *arg == '\0')
			fatal("%s line %d: Missing MaxStartups spec.",
			    filename, linenum);
		if ((n = sscanf(arg, "%d:%d:%d",
		    &options->max_startups_begin,
		    &options->max_startups_rate,
		    &options->max_startups)) == 3) {
			if (options->max_startups_begin >
			    options->max_startups ||
			    options->max_startups_rate > 100 ||
			    options->max_startups_rate < 1)
				fatal("%s line %d: Illegal MaxStartups spec.",
				    filename, linenum);
		} else if (n != 1)
			fatal("%s line %d: Illegal MaxStartups spec.",
			    filename, linenum);
		else
			options->max_startups = options->max_startups_begin;
		break;

	case sMaxAuthTries:
		intptr = &options->max_authtries;
		goto parse_int;

	case sMaxSessions:
		intptr = &options->max_sessions;
		goto parse_int;

	case sBanner:
		charptr = &options->banner;
		goto parse_filename;

	/*
	 * These options can contain %X options expanded at
	 * connect time, so that you can specify paths like:
	 *
	 * AuthorizedKeysFile	/etc/ssh_keys/%u
	 */
	case sAuthorizedKeysFile:
	case sAuthorizedKeysFile2:
		charptr = (opcode == sAuthorizedKeysFile) ?
		    &options->authorized_keys_file :
		    &options->authorized_keys_file2;
		goto parse_filename;

	case sClientAliveInterval:
		intptr = &options->client_alive_interval;
		goto parse_time;

	case sClientAliveCountMax:
		intptr = &options->client_alive_count_max;
		goto parse_int;

	case sAcceptEnv:
		while ((arg = strdelim(&cp)) && *arg != '\0') {
			if (strchr(arg, '=') != NULL)
				fatal("%s line %d: Invalid environment name.",
				    filename, linenum);
			if (options->num_accept_env >= MAX_ACCEPT_ENV)
				fatal("%s line %d: too many allow env.",
				    filename, linenum);
			if (!*activep)
				break;
			options->accept_env[options->num_accept_env++] =
			    xstrdup(arg);
		}
		break;

	case sPermitTunnel:
		intptr = &options->permit_tun;
		arg = strdelim(&cp);
		if (!arg || *arg == '\0')
			fatal("%s line %d: Missing yes/point-to-point/"
			    "ethernet/no argument.", filename, linenum);
		value = -1;
		for (i = 0; tunmode_desc[i].val != -1; i++)
			if (strcmp(tunmode_desc[i].text, arg) == 0) {
				value = tunmode_desc[i].val;
				break;
			}
		if (value == -1)
			fatal("%s line %d: Bad yes/point-to-point/ethernet/"
			    "no argument: %s", filename, linenum, arg);
		if (*intptr == -1)
			*intptr = value;
		break;

	case sMatch:
		if (cmdline)
			fatal("Match directive not supported as a command-line "
			   "option");
		value = match_cfg_line(&cp, linenum, user, host, address);
		if (value < 0)
			fatal("%s line %d: Bad Match condition", filename,
			    linenum);
		*activep = value;
		break;

	case sPermitOpen:
		arg = strdelim(&cp);
		if (!arg || *arg == '\0')
			fatal("%s line %d: missing PermitOpen specification",
			    filename, linenum);
		n = options->num_permitted_opens;	/* modified later */
		if (strcmp(arg, "any") == 0) {
			if (*activep && n == -1) {
				channel_clear_adm_permitted_opens();
				options->num_permitted_opens = 0;
			}
			break;
		}
		if (*activep && n == -1)
			channel_clear_adm_permitted_opens();
		for (; arg != NULL && *arg != '\0'; arg = strdelim(&cp)) {
			p = hpdelim(&arg);
			if (p == NULL)
				fatal("%s line %d: missing host in PermitOpen",
				    filename, linenum);
			p = cleanhostname(p);
			if (arg == NULL || (port = a2port(arg)) <= 0)
				fatal("%s line %d: bad port number in "
				    "PermitOpen", filename, linenum);
			if (*activep && n == -1)
				options->num_permitted_opens =
				    channel_add_adm_permitted_opens(p, port);
		}
		break;

	case sForceCommand:
		if (cp == NULL)
			fatal("%.200s line %d: Missing argument.", filename,
			    linenum);
		len = strspn(cp, WHITESPACE);
		if (*activep && options->adm_forced_command == NULL)
			options->adm_forced_command = xstrdup(cp + len);
		return 0;

	case sChrootDirectory:
		charptr = &options->chroot_directory;

		arg = strdelim(&cp);
		if (!arg || *arg == '\0')
			fatal("%s line %d: missing file name.",
			    filename, linenum);
		if (*activep && *charptr == NULL)
			*charptr = xstrdup(arg);
		break;

	case sDeprecated:
		logit("%s line %d: Deprecated option %s",
		    filename, linenum, arg);
		while (arg)
		    arg = strdelim(&cp);
		break;

	case sUnsupported:
		logit("%s line %d: Unsupported option %s",
		    filename, linenum, arg);
		while (arg)
		    arg = strdelim(&cp);
		break;

	default:
		fatal("%s line %d: Missing handler for opcode %s (%d)",
		    filename, linenum, arg, opcode);
	}
	if ((arg = strdelim(&cp)) != NULL && *arg != '\0')
		fatal("%s line %d: garbage at end of line; \"%.200s\".",
		    filename, linenum, arg);
	return 0;
}
예제 #11
0
void read_server_config(ServerOptions * options, const char *filename)
{
    FILE *f;
    char line[1024];
    char *cp, **charptr;
    int linenum, *intptr, i, value;
    ServerOpCodes opcode;

    f = fopen(filename, "r");
    if (!f) {
        perror(filename);
        return;
    }

    linenum = 0;
    while (fgets(line, sizeof(line), f)) {
        linenum++;
        cp = line + strspn(line, WHITESPACE);
        if (!*cp || *cp == '#')
            continue;
        cp = strtok(cp, WHITESPACE);
        for (i = 0; cp[i]; i++)
            cp[i] = tolower(cp[i]);
        opcode = parse_token(cp, filename, linenum);
        switch (opcode) {
        case sPort:
            intptr = &options->port;
          parse_int:
            cp = strtok(NULL, WHITESPACE);
            if (!cp) {
                fprintf(stderr, "%s line %d: missing integer value.\n", filename, linenum);
                exit(1);
            }
            if (*cp == '0') {   /* Octal or hex */
                int base;

                cp++;
                if (*cp == 'x') {       /* Hex */
                    cp++;
                    base = 16;
                } else
                    base = 8;
                value = 0;
                while ((base == 16 && isxdigit(*cp)) || (base == 8 && isdigit(*cp) && *cp < '8')) {
                    value *= base;
                    if (*cp >= 'a' && *cp <= 'f')
                        value += *cp - 'a' + 10;
                    else if (*cp >= 'A' && *cp <= 'F')
                        value += *cp - 'A' + 10;
                    else
                        value += *cp - '0';
                    cp++;
                }
            } else {
                value = atoi(cp);
            }
            if (*intptr == -1)
                *intptr = value;
            break;

        case sServerKeyBits:
            intptr = &options->server_key_bits;
            goto parse_int;

        case sLoginGraceTime:
            intptr = &options->login_grace_time;
            goto parse_int;

        case sKeyRegenerationTime:
            intptr = &options->key_regeneration_time;
            goto parse_int;

        case sListenAddress:
            cp = strtok(NULL, WHITESPACE);
            if (!cp) {
                fprintf(stderr, "%s line %d: missing inet addr.\n", filename, linenum);
                exit(1);
            }
#ifdef BROKEN_INET_ADDR
            options->listen_addr.s_addr = inet_network(cp);
#else                           /* BROKEN_INET_ADDR */
            options->listen_addr.s_addr = inet_addr(cp);
#endif                          /* BROKEN_INET_ADDR */
            break;

        case sHostKeyFile:
            charptr = &options->host_key_file;
          parse_pathname:
            cp = strtok(NULL, WHITESPACE);
            if (!cp) {
                fprintf(stderr, "%s line %d: missing file name.\n", filename, linenum);
                exit(1);
            }
            if (*charptr == NULL)
                *charptr = tilde_expand_filename(cp, getuid());
            break;

        case sRandomSeedFile:
            charptr = &options->random_seed_file;
            goto parse_pathname;

        case sPidFile:
            charptr = &options->pid_file;
            goto parse_pathname;

        case sPermitRootLogin:
            cp = strtok(NULL, WHITESPACE);
            if (!cp) {
                fprintf(stderr, "%s line %d: missing yes/nopwd/no argument.\n", filename, linenum);
                exit(1);
            }
            for (i = 0; cp[i]; i++)
                cp[i] = tolower(cp[i]);
            if (strcmp(cp, "yes") == 0)
                value = 2;
            else if (strcmp(cp, "nopwd") == 0)
                value = 1;
            else if (strcmp(cp, "no") == 0)
                value = 0;
            else {
                fprintf(stderr, "%s line %d: Bad yes/nopwd/no argument: %s\n", filename, linenum, cp);
                exit(1);
            }
            if (options->permit_root_login == -1)
                options->permit_root_login = value;
            break;

          parse_flag:
            cp = strtok(NULL, WHITESPACE);
            if (!cp) {
                fprintf(stderr, "%s line %d: missing yes/no argument.\n", filename, linenum);
                exit(1);
            }
            for (i = 0; cp[i]; i++)
                cp[i] = tolower(cp[i]);
            if (strcmp(cp, "yes") == 0 || strcmp(cp, "true") == 0)
                value = 1;
            else if (strcmp(cp, "no") == 0 || strcmp(cp, "false") == 0)
                value = 0;
            else {
                fprintf(stderr, "%s line %d: Bad yes/no argument: %s\n", filename, linenum, cp);
                exit(1);
            }
            if (*intptr == -1)
                *intptr = value;
            break;

        case sIgnoreRhosts:
            intptr = &options->ignore_rhosts;
            goto parse_flag;

        case sIgnoreRootRhosts:
            intptr = &options->ignore_root_rhosts;
            goto parse_flag;

        case sQuietMode:
            intptr = &options->quiet_mode;
            goto parse_flag;

        case sFascistLogging:
            intptr = &options->fascist_logging;
            goto parse_flag;

        case sRhostsAuthentication:
            intptr = &options->rhosts_authentication;
            goto parse_flag;

        case sRhostsRSAAuthentication:
            intptr = &options->rhosts_rsa_authentication;
            goto parse_flag;

        case sRSAAuthentication:
            intptr = &options->rsa_authentication;
            goto parse_flag;

        case sKerberosAuthentication:
            intptr = &options->kerberos_authentication;
            goto parse_flag;

        case sKerberosOrLocalPasswd:
            intptr = &options->kerberos_or_local_passwd;
            goto parse_flag;

        case sKerberosTgtPassing:
            intptr = &options->kerberos_tgt_passing;
            goto parse_flag;

        case sAllowTcpForwarding:
            intptr = &options->allow_tcp_forwarding;
            goto parse_flag;

        case sTISAuthentication:
            intptr = &options->tis_authentication;
            goto parse_flag;

        case sPasswordAuthentication:
            intptr = &options->password_authentication;
            goto parse_flag;

        case sUseLogin:
            intptr = &options->use_login;
            goto parse_flag;

        case sPrintMotd:
            intptr = &options->print_motd;
            goto parse_flag;

        case sX11Forwarding:
            intptr = &options->x11_forwarding;
            goto parse_flag;

        case sX11DisplayOffset:
            intptr = &options->x11_display_offset;
            goto parse_int;

        case sStrictModes:
            intptr = &options->strict_modes;
            goto parse_flag;

        case sKeepAlives:
            intptr = &options->keepalives;
            goto parse_flag;

        case sEmptyPasswd:
            intptr = &options->permit_empty_passwd;
            goto parse_flag;

        case sSilentDeny:
            intptr = &options->silent_deny;
            goto parse_flag;

        case sForcedPasswd:
            intptr = &options->forced_passwd_change;
            goto parse_flag;

        case sForcedEmptyPasswd:
            intptr = &options->forced_empty_passwd_change;
            goto parse_flag;

        case sUmask:
            intptr = &options->umask;
            goto parse_int;

        case sIdleTimeout:
            cp = strtok(NULL, WHITESPACE);
            if (!cp) {
                fprintf(stderr, "%s line %d: missing integer value.\n", filename, linenum);
                exit(1);
            }
            value = 0;
            while (isdigit(*cp)) {
                value *= 10;
                value += *cp - '0';
                cp++;
            }
            *cp = tolower(*cp);
            if (*cp == 'w') {   /* Weeks */
                value *= 7 * 24 * 60 * 60;
                cp++;
            } else if (*cp == 'd') {    /* Days */
                value *= 24 * 60 * 60;
                cp++;
            } else if (*cp == 'h') {    /* Hours */
                value *= 60 * 60;
                cp++;
            } else if (*cp == 'm') {    /* Minutes */
                value *= 60;
                cp++;
            } else if (*cp == 's') {
                cp++;
            }
            options->idle_timeout = value;
            break;

        case sLogFacility:
            cp = strtok(NULL, WHITESPACE);
            if (!cp) {
                fprintf(stderr, "%s line %d: missing facility name.\n", filename, linenum);
                exit(1);
            }
            for (i = 0; cp[i]; i++)
                cp[i] = tolower(cp[i]);
            for (i = 0; log_facilities[i].name; i++)
                if (strcmp(log_facilities[i].name, cp) == 0)
                    break;
            if (!log_facilities[i].name) {
                fprintf(stderr, "%s line %d: unsupported log facility %s\n", filename, linenum, cp);
                exit(1);
            }
            if (options->log_facility == (SyslogFacility) (-1))
                options->log_facility = log_facilities[i].facility;
            break;

        case sAllowSHosts:
            while ((cp = strtok(NULL, WHITESPACE))) {
                if (options->num_allow_shosts >= MAX_ALLOW_SHOSTS) {
                    fprintf(stderr, "%s line %d: too many allow shosts.\n", filename, linenum);
                    exit(1);
                }
                options->allow_shosts[options->num_allow_shosts++] = xstrdup(cp);
            }
            break;

        case sDenySHosts:
            while ((cp = strtok(NULL, WHITESPACE))) {
                if (options->num_deny_shosts >= MAX_DENY_SHOSTS) {
                    fprintf(stderr, "%s line %d: too many deny shosts.\n", filename, linenum);
                    exit(1);
                }
                options->deny_shosts[options->num_deny_shosts++] = xstrdup(cp);
            }
            break;

        case sAllowHosts:
            while ((cp = strtok(NULL, WHITESPACE))) {
                if (options->num_allow_hosts >= MAX_ALLOW_HOSTS) {
                    fprintf(stderr, "%s line %d: too many allow hosts.\n", filename, linenum);
                    exit(1);
                }
                options->allow_hosts[options->num_allow_hosts++] = xstrdup(cp);
            }
            break;

        case sDenyHosts:
            while ((cp = strtok(NULL, WHITESPACE))) {
                if (options->num_deny_hosts >= MAX_DENY_HOSTS) {
                    fprintf(stderr, "%s line %d: too many deny hosts.\n", filename, linenum);
                    exit(1);
                }
                options->deny_hosts[options->num_deny_hosts++] = xstrdup(cp);
            }
            break;

        case sAllowUsers:
            while ((cp = strtok(NULL, WHITESPACE))) {
                if (options->num_allow_users >= MAX_ALLOW_USERS) {
                    fprintf(stderr, "%s line %d: too many allow users.\n", filename, linenum);
                    exit(1);
                }
                options->allow_users[options->num_allow_users++] = xstrdup(cp);
            }
            break;

        case sDenyUsers:
            while ((cp = strtok(NULL, WHITESPACE))) {
                if (options->num_deny_users >= MAX_DENY_USERS) {
                    fprintf(stderr, "%s line %d: too many deny users.\n", filename, linenum);
                    exit(1);
                }
                options->deny_users[options->num_deny_users++] = xstrdup(cp);
            }
            break;

        case sAllowGroups:
            while ((cp = strtok(NULL, WHITESPACE))) {
                if (options->num_allow_groups >= MAX_ALLOW_GROUPS) {
                    fprintf(stderr, "%s line %d: too many allow groups.\n", filename, linenum);
                    exit(1);
                }
                options->allow_groups[options->num_allow_groups++] = xstrdup(cp);
            }
            break;

        case sDenyGroups:
            while ((cp = strtok(NULL, WHITESPACE))) {
                if (options->num_deny_groups >= MAX_DENY_GROUPS) {
                    fprintf(stderr, "%s line %d: too many deny groups.\n", filename, linenum);
                    exit(1);
                }
                options->deny_groups[options->num_deny_groups++] = xstrdup(cp);
            }
            break;

        case sXauthPath:
            charptr = &options->xauth_path;
            goto parse_pathname;

        case sCheckMail:
            intptr = &options->check_mail;
            goto parse_flag;

        case sPasswordExpireWarningDays:
            intptr = &options->password_expire_warning_days;
            goto parse_int;

        case sAccountExpireWarningDays:
            intptr = &options->account_expire_warning_days;
            goto parse_int;

#ifdef F_SECURE_COMMERCIAL























































#endif                          /* F_SECURE_COMMERCIAL */

        default:
            fprintf(stderr, "%s line %d: Missing handler for opcode %s (%d)\n", filename, linenum, cp, opcode);
            exit(1);
        }
        if (strtok(NULL, WHITESPACE) != NULL) {
            fprintf(stderr, "%s line %d: garbage at end of line.\n", filename, linenum);
            exit(1);
        }
    }
    fclose(f);
}
예제 #12
0
int
process_server_config_line(ServerOptions *options, char *line,
    const char *filename, int linenum)
{
	char *cp, **charptr, *arg, *p;
	int *intptr, value, i, n;
	ServerOpCodes opcode;

	cp = line;
	arg = strdelim(&cp);
	/* Ignore leading whitespace */
	if (*arg == '\0')
		arg = strdelim(&cp);
	if (!arg || !*arg || *arg == '#')
		return 0;
	intptr = NULL;
	charptr = NULL;
	opcode = parse_token(arg, filename, linenum);
	switch (opcode) {
	/* Portable-specific options */
	case sPAMAuthenticationViaKbdInt:
		intptr = &options->pam_authentication_via_kbd_int;
		goto parse_flag;

	/* Standard Options */
	case sBadOption:
		return -1;
	case sPort:
		/* ignore ports from configfile if cmdline specifies ports */
		if (options->ports_from_cmdline)
			return 0;
		if (options->listen_addrs != NULL)
			fatal("%s line %d: ports must be specified before "
			    "ListenAddress.", filename, linenum);
		if (options->num_ports >= MAX_PORTS)
			fatal("%s line %d: too many ports.",
			    filename, linenum);
		arg = strdelim(&cp);
		if (!arg || *arg == '\0')
			fatal("%s line %d: missing port number.",
			    filename, linenum);
		options->ports[options->num_ports++] = a2port(arg);
		if (options->ports[options->num_ports-1] == 0)
			fatal("%s line %d: Badly formatted port number.",
			    filename, linenum);
		break;

	case sServerKeyBits:
		intptr = &options->server_key_bits;
parse_int:
		arg = strdelim(&cp);
		if (!arg || *arg == '\0')
			fatal("%s line %d: missing integer value.",
			    filename, linenum);
		value = atoi(arg);
		if (*intptr == -1)
			*intptr = value;
		break;

	case sLoginGraceTime:
		intptr = &options->login_grace_time;
parse_time:
		arg = strdelim(&cp);
		if (!arg || *arg == '\0')
			fatal("%s line %d: missing time value.",
			    filename, linenum);
		if ((value = convtime(arg)) == -1)
			fatal("%s line %d: invalid time value.",
			    filename, linenum);
		if (*intptr == -1)
			*intptr = value;
		break;

	case sKeyRegenerationTime:
		intptr = &options->key_regeneration_time;
		goto parse_time;

	case sListenAddress:
		arg = strdelim(&cp);
		if (!arg || *arg == '\0' || strncmp(arg, "[]", 2) == 0)
			fatal("%s line %d: missing inet addr.",
			    filename, linenum);
		if (*arg == '[') {
			if ((p = strchr(arg, ']')) == NULL)
				fatal("%s line %d: bad ipv6 inet addr usage.",
				    filename, linenum);
			arg++;
			memmove(p, p+1, strlen(p+1)+1);
		} else if (((p = strchr(arg, ':')) == NULL) ||
			    (strchr(p+1, ':') != NULL)) {
			add_listen_addr(options, arg, 0);
			break;
		}
		if (*p == ':') {
			u_short port;

			p++;
			if (*p == '\0')
				fatal("%s line %d: bad inet addr:port usage.",
				    filename, linenum);
			else {
				*(p-1) = '\0';
				if ((port = a2port(p)) == 0)
					fatal("%s line %d: bad port number.",
					    filename, linenum);
				add_listen_addr(options, arg, port);
			}
		} else if (*p == '\0')
			add_listen_addr(options, arg, 0);
		else
			fatal("%s line %d: bad inet addr usage.",
			    filename, linenum);
		break;

	case sHostKeyFile:
		intptr = &options->num_host_key_files;
		if (*intptr >= MAX_HOSTKEYS)
			fatal("%s line %d: too many host keys specified (max %d).",
			    filename, linenum, MAX_HOSTKEYS);
		charptr = &options->host_key_files[*intptr];
parse_filename:
		arg = strdelim(&cp);
		if (!arg || *arg == '\0')
			fatal("%s line %d: missing file name.",
			    filename, linenum);
		if (*charptr == NULL) {
			*charptr = tilde_expand_filename(arg, getuid());
			/* increase optional counter */
			if (intptr != NULL)
				*intptr = *intptr + 1;
		}
		break;

	case sPidFile:
		charptr = &options->pid_file;
		goto parse_filename;

	case sPermitRootLogin:
		intptr = &options->permit_root_login;
		arg = strdelim(&cp);
		if (!arg || *arg == '\0')
			fatal("%s line %d: missing yes/"
			    "without-password/forced-commands-only/no "
			    "argument.", filename, linenum);
		value = 0;	/* silence compiler */
		if (strcmp(arg, "without-password") == 0)
			value = PERMIT_NO_PASSWD;
		else if (strcmp(arg, "forced-commands-only") == 0)
			value = PERMIT_FORCED_ONLY;
		else if (strcmp(arg, "yes") == 0)
			value = PERMIT_YES;
		else if (strcmp(arg, "no") == 0)
			value = PERMIT_NO;
		else
			fatal("%s line %d: Bad yes/"
			    "without-password/forced-commands-only/no "
			    "argument: %s", filename, linenum, arg);
		if (*intptr == -1)
			*intptr = value;
		break;

	case sIgnoreRhosts:
		intptr = &options->ignore_rhosts;
parse_flag:
		arg = strdelim(&cp);
		if (!arg || *arg == '\0')
			fatal("%s line %d: missing yes/no argument.",
			    filename, linenum);
		value = 0;	/* silence compiler */
		if (strcmp(arg, "yes") == 0)
			value = 1;
		else if (strcmp(arg, "no") == 0)
			value = 0;
		else
			fatal("%s line %d: Bad yes/no argument: %s",
				filename, linenum, arg);
		if (*intptr == -1)
			*intptr = value;
		break;

	case sIgnoreUserKnownHosts:
		intptr = &options->ignore_user_known_hosts;
		goto parse_flag;

	case sRhostsAuthentication:
		intptr = &options->rhosts_authentication;
		goto parse_flag;

	case sRhostsRSAAuthentication:
		intptr = &options->rhosts_rsa_authentication;
		goto parse_flag;

	case sHostbasedAuthentication:
		intptr = &options->hostbased_authentication;
		goto parse_flag;

	case sHostbasedUsesNameFromPacketOnly:
		intptr = &options->hostbased_uses_name_from_packet_only;
		goto parse_flag;

	case sRSAAuthentication:
		intptr = &options->rsa_authentication;
		goto parse_flag;

	case sPubkeyAuthentication:
		intptr = &options->pubkey_authentication;
		goto parse_flag;
#if defined(KRB4) || defined(KRB5)
	case sKerberosAuthentication:
		intptr = &options->kerberos_authentication;
		goto parse_flag;

	case sKerberosOrLocalPasswd:
		intptr = &options->kerberos_or_local_passwd;
		goto parse_flag;

	case sKerberosTicketCleanup:
		intptr = &options->kerberos_ticket_cleanup;
		goto parse_flag;
#endif
#if defined(AFS) || defined(KRB5)
	case sKerberosTgtPassing:
		intptr = &options->kerberos_tgt_passing;
		goto parse_flag;
#endif
#ifdef AFS
	case sAFSTokenPassing:
		intptr = &options->afs_token_passing;
		goto parse_flag;
#endif

	case sPasswordAuthentication:
		intptr = &options->password_authentication;
		goto parse_flag;

	case sKbdInteractiveAuthentication:
		intptr = &options->kbd_interactive_authentication;
		goto parse_flag;

	case sChallengeResponseAuthentication:
		intptr = &options->challenge_response_authentication;
		goto parse_flag;

	case sPrintMotd:
		intptr = &options->print_motd;
		goto parse_flag;

	case sPrintLastLog:
		intptr = &options->print_lastlog;
		goto parse_flag;

	case sX11Forwarding:
		intptr = &options->x11_forwarding;
		goto parse_flag;

	case sX11DisplayOffset:
		intptr = &options->x11_display_offset;
		goto parse_int;

	case sX11UseLocalhost:
		intptr = &options->x11_use_localhost;
		goto parse_flag;

	case sXAuthLocation:
		charptr = &options->xauth_location;
		goto parse_filename;

	case sStrictModes:
		intptr = &options->strict_modes;
		goto parse_flag;

	case sKeepAlives:
		intptr = &options->keepalives;
		goto parse_flag;

	case sEmptyPasswd:
		intptr = &options->permit_empty_passwd;
		goto parse_flag;

	case sPermitUserEnvironment:
		intptr = &options->permit_user_env;
		goto parse_flag;

	case sUseLogin:
		intptr = &options->use_login;
		goto parse_flag;

	case sCompression:
		intptr = &options->compression;
		goto parse_flag;

	case sGatewayPorts:
		intptr = &options->gateway_ports;
		goto parse_flag;

	case sVerifyReverseMapping:
		intptr = &options->verify_reverse_mapping;
		goto parse_flag;

	case sLogFacility:
		intptr = (int *) &options->log_facility;
		arg = strdelim(&cp);
		value = log_facility_number(arg);
		if (value == SYSLOG_FACILITY_NOT_SET)
			fatal("%.200s line %d: unsupported log facility '%s'",
			    filename, linenum, arg ? arg : "<NONE>");
		if (*intptr == -1)
			*intptr = (SyslogFacility) value;
		break;

	case sLogLevel:
		intptr = (int *) &options->log_level;
		arg = strdelim(&cp);
		value = log_level_number(arg);
		if (value == SYSLOG_LEVEL_NOT_SET)
			fatal("%.200s line %d: unsupported log level '%s'",
			    filename, linenum, arg ? arg : "<NONE>");
		if (*intptr == -1)
			*intptr = (LogLevel) value;
		break;

	case sAllowTcpForwarding:
		intptr = &options->allow_tcp_forwarding;
		goto parse_flag;

	case sUsePrivilegeSeparation:
		intptr = &use_privsep;
		goto parse_flag;

	case sAllowUsers:
		while ((arg = strdelim(&cp)) && *arg != '\0') {
			if (options->num_allow_users >= MAX_ALLOW_USERS)
				fatal("%s line %d: too many allow users.",
				    filename, linenum);
			options->allow_users[options->num_allow_users++] =
			    xstrdup(arg);
		}
		break;

	case sDenyUsers:
		while ((arg = strdelim(&cp)) && *arg != '\0') {
			if (options->num_deny_users >= MAX_DENY_USERS)
				fatal( "%s line %d: too many deny users.",
				    filename, linenum);
			options->deny_users[options->num_deny_users++] =
			    xstrdup(arg);
		}
		break;

	case sAllowGroups:
		while ((arg = strdelim(&cp)) && *arg != '\0') {
			if (options->num_allow_groups >= MAX_ALLOW_GROUPS)
				fatal("%s line %d: too many allow groups.",
				    filename, linenum);
			options->allow_groups[options->num_allow_groups++] =
			    xstrdup(arg);
		}
		break;

	case sDenyGroups:
		while ((arg = strdelim(&cp)) && *arg != '\0') {
			if (options->num_deny_groups >= MAX_DENY_GROUPS)
				fatal("%s line %d: too many deny groups.",
				    filename, linenum);
			options->deny_groups[options->num_deny_groups++] = xstrdup(arg);
		}
		break;

	case sCiphers:
		arg = strdelim(&cp);
		if (!arg || *arg == '\0')
			fatal("%s line %d: Missing argument.", filename, linenum);
		if (!ciphers_valid(arg))
			fatal("%s line %d: Bad SSH2 cipher spec '%s'.",
			    filename, linenum, arg ? arg : "<NONE>");
		if (options->ciphers == NULL)
			options->ciphers = xstrdup(arg);
		break;

	case sMacs:
		arg = strdelim(&cp);
		if (!arg || *arg == '\0')
			fatal("%s line %d: Missing argument.", filename, linenum);
		if (!mac_valid(arg))
			fatal("%s line %d: Bad SSH2 mac spec '%s'.",
			    filename, linenum, arg ? arg : "<NONE>");
		if (options->macs == NULL)
			options->macs = xstrdup(arg);
		break;

	case sProtocol:
		intptr = &options->protocol;
		arg = strdelim(&cp);
		if (!arg || *arg == '\0')
			fatal("%s line %d: Missing argument.", filename, linenum);
		value = proto_spec(arg);
		if (value == SSH_PROTO_UNKNOWN)
			fatal("%s line %d: Bad protocol spec '%s'.",
			    filename, linenum, arg ? arg : "<NONE>");
		if (*intptr == SSH_PROTO_UNKNOWN)
			*intptr = value;
		break;

	case sSubsystem:
		if (options->num_subsystems >= MAX_SUBSYSTEMS) {
			fatal("%s line %d: too many subsystems defined.",
			    filename, linenum);
		}
		arg = strdelim(&cp);
		if (!arg || *arg == '\0')
			fatal("%s line %d: Missing subsystem name.",
			    filename, linenum);
		for (i = 0; i < options->num_subsystems; i++)
			if (strcmp(arg, options->subsystem_name[i]) == 0)
				fatal("%s line %d: Subsystem '%s' already defined.",
				    filename, linenum, arg);
		options->subsystem_name[options->num_subsystems] = xstrdup(arg);
		arg = strdelim(&cp);
		if (!arg || *arg == '\0')
			fatal("%s line %d: Missing subsystem command.",
			    filename, linenum);
		options->subsystem_command[options->num_subsystems] = xstrdup(arg);
		options->num_subsystems++;
		break;

	case sMaxStartups:
		arg = strdelim(&cp);
		if (!arg || *arg == '\0')
			fatal("%s line %d: Missing MaxStartups spec.",
			    filename, linenum);
		if ((n = sscanf(arg, "%d:%d:%d",
		    &options->max_startups_begin,
		    &options->max_startups_rate,
		    &options->max_startups)) == 3) {
			if (options->max_startups_begin >
			    options->max_startups ||
			    options->max_startups_rate > 100 ||
			    options->max_startups_rate < 1)
				fatal("%s line %d: Illegal MaxStartups spec.",
				    filename, linenum);
		} else if (n != 1)
			fatal("%s line %d: Illegal MaxStartups spec.",
			    filename, linenum);
		else
			options->max_startups = options->max_startups_begin;
		break;

	case sBanner:
		charptr = &options->banner;
		goto parse_filename;
	/*
	 * These options can contain %X options expanded at
	 * connect time, so that you can specify paths like:
	 *
	 * AuthorizedKeysFile	/etc/ssh_keys/%u
	 */
	case sAuthorizedKeysFile:
	case sAuthorizedKeysFile2:
		charptr = (opcode == sAuthorizedKeysFile ) ?
		    &options->authorized_keys_file :
		    &options->authorized_keys_file2;
		goto parse_filename;

	case sClientAliveInterval:
		intptr = &options->client_alive_interval;
		goto parse_time;

	case sClientAliveCountMax:
		intptr = &options->client_alive_count_max;
		goto parse_int;

	case sDeprecated:
		log("%s line %d: Deprecated option %s",
		    filename, linenum, arg);
		while (arg)
		    arg = strdelim(&cp);
		break;

	default:
		fatal("%s line %d: Missing handler for opcode %s (%d)",
		    filename, linenum, arg, opcode);
	}
	if ((arg = strdelim(&cp)) != NULL && *arg != '\0')
		fatal("%s line %d: garbage at end of line; \"%.200s\".",
		    filename, linenum, arg);
	return 0;
}
예제 #13
0
파일: ssh.c 프로젝트: Te-k/openssh-backdoor
/*
 * Main program for the ssh client.
 */
int
main(int ac, char **av)
{
	int i, opt, exit_status;
	u_short fwd_port, fwd_host_port;
	char sfwd_port[6], sfwd_host_port[6];
	char *p, *cp, buf[256];
	struct stat st;
	struct passwd *pw;
	int dummy;
	extern int optind, optreset;
	extern char *optarg;

	__progname = 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) {
		log("You don't exist, go away!");
		exit(1);
	}
	/* 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:NPR:TVX")) != -1) {
		switch (opt) {
		case '1':
			options.protocol = SSH_PROTO_1;
			break;
		case '2':
			options.protocol = SSH_PROTO_2;
			break;
		case '4':
			IPv4or6 = AF_INET;
			break;
		case '6':
			IPv4or6 = 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 'g':
			options.gateway_ports = 1;
			break;
		case 'P':	/* deprecated */
			options.use_privileged_port = 0;
			break;
		case 'a':
			options.forward_agent = 0;
			break;
		case 'A':
			options.forward_agent = 1;
			break;
#ifdef AFS
		case 'k':
			options.kerberos_tgt_passing = 0;
			options.afs_token_passing = 0;
			break;
#endif
		case 'i':
			if (stat(optarg, &st) < 0) {
				fprintf(stderr, "Warning: Identity file %s "
				    "does not exist.\n", optarg);
				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 (0 == debug_flag) {
				debug_flag = 1;
				options.log_level = SYSLOG_LEVEL_DEBUG1;
			} else if (options.log_level < SYSLOG_LEVEL_DEBUG3) {
				options.log_level++;
				break;
			} else
				fatal("Too high debugging level.");
			/* fallthrough */
		case 'V':
			fprintf(stderr,
			    "%s, SSH protocols %d.%d/%d.%d, OpenSSL 0x%8.8lx\n",
			    SSH_VERSION,
			    PROTOCOL_MAJOR_1, PROTOCOL_MINOR_1,
			    PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2,
			    SSLeay());
			if (opt == 'V')
				exit(0);
			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(1);
			}
			break;
		case 'c':
			if (ciphers_valid(optarg)) {
				/* SSH2 only */
				options.ciphers = xstrdup(optarg);
				options.cipher = SSH_CIPHER_ILLEGAL;
			} else {
				/* SSH1 only */
				options.cipher = cipher_number(optarg);
				if (options.cipher == -1) {
					fprintf(stderr,
					    "Unknown cipher type '%s'\n",
					    optarg);
					exit(1);
				}
				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(1);
			}
			break;
		case 'p':
			options.port = a2port(optarg);
			if (options.port == 0) {
				fprintf(stderr, "Bad port '%s'\n", optarg);
				exit(1);
			}
			break;
		case 'l':
			options.user = optarg;
			break;

		case 'L':
		case 'R':
			if (sscanf(optarg, "%5[0-9]:%255[^:]:%5[0-9]",
			    sfwd_port, buf, sfwd_host_port) != 3 &&
			    sscanf(optarg, "%5[0-9]/%255[^/]/%5[0-9]",
			    sfwd_port, buf, sfwd_host_port) != 3) {
				fprintf(stderr,
				    "Bad forwarding specification '%s'\n",
				    optarg);
				usage();
				/* NOTREACHED */
			}
			if ((fwd_port = a2port(sfwd_port)) == 0 ||
			    (fwd_host_port = a2port(sfwd_host_port)) == 0) {
				fprintf(stderr,
				    "Bad forwarding port(s) '%s'\n", optarg);
				exit(1);
			}
			if (opt == 'L')
				add_local_forward(&options, fwd_port, buf,
				    fwd_host_port);
			else if (opt == 'R')
				add_remote_forward(&options, fwd_port, buf,
				    fwd_host_port);
			break;

		case 'D':
			fwd_port = a2port(optarg);
			if (fwd_port == 0) {
				fprintf(stderr, "Bad dynamic port '%s'\n",
				    optarg);
				exit(1);
			}
			add_local_forward(&options, fwd_port, "socks4", 0);
			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;
			if (process_config_line(&options, host ? host : "",
			    optarg, "command-line", 0, &dummy) != 0)
				exit(1);
			break;
		case 's':
			subsystem_flag = 1;
			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();
	channel_set_af(IPv4or6);

	/* 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)) && !force_tty_flag) {
		if (tty_flag)
			log("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))
			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);

		/* Read systemwide configuration file after use config. */
		(void)read_config_file(_PATH_HOST_CONFIG_FILE, host, &options);
	}

	/* Fill configuration defaults. */
	fill_default_options(&options);

	/* 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;

	if (options.proxy_command != NULL &&
	    strcmp(options.proxy_command, "none") == 0)
		options.proxy_command = NULL;

	/* Disable rhosts authentication if not running as root. */
#ifdef HAVE_CYGWIN
	/* Ignore uid if running under Windows */
	if (!options.use_privileged_port) {
#else
	if (original_effective_uid != 0 || !options.use_privileged_port) {
#endif
		debug("Rhosts Authentication disabled, "
		    "originating port will not be trusted.");
		options.rhosts_authentication = 0;
	}
	/* Open a connection to the remote host. */

	if (ssh_connect(host, &hostaddr, options.port, IPv4or6,
	    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(1);

	/*
	 * 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 = xmalloc(sensitive_data.nkeys *
		    sizeof(Key));

		PRIV_START;
		sensitive_data.keys[0] = key_load_private_type(KEY_RSA1,
		    _PATH_HOST_KEY_FILE, "", NULL);
		sensitive_data.keys[1] = key_load_private_type(KEY_DSA,
		    _PATH_HOST_DSA_KEY_FILE, "", NULL);
		sensitive_data.keys[2] = key_load_private_type(KEY_RSA,
		    _PATH_HOST_RSA_KEY_FILE, "", 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.
	 */
	seteuid(original_real_uid);
	setuid(original_real_uid);

	/*
	 * 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();

	/*
	 * 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
x11_get_proto(char **_proto, char **_data)
{
	char line[512];
	static char proto[512], data[512];
	FILE *f;
	int got_data = 0, i;
	char *display;
	struct stat st;

	*_proto = proto;
	*_data = data;
	proto[0] = data[0] = '\0';
	if (!options.xauth_location ||
	    (stat(options.xauth_location, &st) == -1)) {
		debug("No xauth program.");
	} else {
		if ((display = getenv("DISPLAY")) == NULL) {
			debug("x11_get_proto: DISPLAY not set");
			return;
		}
		/* Try to get Xauthority information for the display. */
		if (strncmp(display, "localhost:", 10) == 0)
			/*
			 * Handle FamilyLocal case where $DISPLAY does
			 * not match an authorization entry.  For this we
			 * just try "xauth list unix:displaynum.screennum".
			 * XXX: "localhost" match to determine FamilyLocal
			 *      is not perfect.
			 */
			snprintf(line, sizeof line, "%s list unix:%s 2>"
			    _PATH_DEVNULL, options.xauth_location, display+10);
		else
			snprintf(line, sizeof line, "%s list %.200s 2>"
			    _PATH_DEVNULL, options.xauth_location, display);
		debug2("x11_get_proto: %s", line);
		f = popen(line, "r");
		if (f && fgets(line, sizeof(line), f) &&
		    sscanf(line, "%*s %511s %511s", proto, data) == 2)
			got_data = 1;
		if (f)
			pclose(f);
	}
	/*
	 * If we didn't get authentication data, just make up some
	 * data.  The forwarding code will check the validity of the
	 * response anyway, and substitute this data.  The X11
	 * server, however, will ignore this fake data and use
	 * whatever authentication mechanisms it was using otherwise
	 * for the local connection.
	 */
	if (!got_data) {
		u_int32_t rand = 0;

		log("Warning: No xauth data; using fake authentication data for X11 forwarding.");
		strlcpy(proto, "MIT-MAGIC-COOKIE-1", sizeof proto);
		for (i = 0; i < 16; i++) {
			if (i % 4 == 0)
				rand = arc4random();
			snprintf(data + 2 * i, sizeof data - 2 * i, "%02x", rand & 0xff);
			rand >>= 8;
		}
	}