Esempio n. 1
0
int
process_config_line(Options *options, const char *host,
		    char *line, const char *filename, int linenum,
		    int *activep)
{
	char *s, **charptr, *endofnumber, *keyword, *arg, *arg2, fwdarg[256];
	int opcode, *intptr, value, value2, scale;
	LogLevel *log_level_ptr;
	long long orig, val64;
	size_t len;
	Forward fwd;

	/* Strip trailing whitespace */
	for (len = strlen(line) - 1; len > 0; len--) {
		if (strchr(WHITESPACE, line[len]) == NULL)
			break;
		line[len] = '\0';
	}

	s = line;
	/* Get the keyword. (Each line is supposed to begin with a keyword). */
	if ((keyword = strdelim(&s)) == NULL)
		return 0;
	/* Ignore leading whitespace. */
	if (*keyword == '\0')
		keyword = strdelim(&s);
	if (keyword == NULL || !*keyword || *keyword == '\n' || *keyword == '#')
		return 0;

	opcode = parse_token(keyword, filename, linenum);

	switch (opcode) {
	case oBadOption:
		/* don't panic, but count bad options */
		return -1;
		/* NOTREACHED */
	case oConnectTimeout:
		intptr = &options->connection_timeout;
parse_time:
		arg = strdelim(&s);
		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 (*activep && *intptr == -1)
			*intptr = value;
		break;

	case oForwardAgent:
		intptr = &options->forward_agent;
parse_flag:
		arg = strdelim(&s);
		if (!arg || *arg == '\0')
			fatal("%.200s line %d: Missing yes/no argument.", filename, linenum);
		value = 0;	/* To avoid compiler warning... */
		if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0)
			value = 1;
		else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0)
			value = 0;
		else
			fatal("%.200s line %d: Bad yes/no argument.", filename, linenum);
		if (*activep && *intptr == -1)
			*intptr = value;
		break;

	case oForwardX11:
		intptr = &options->forward_x11;
		goto parse_flag;

	case oForwardX11Trusted:
		intptr = &options->forward_x11_trusted;
		goto parse_flag;
	
	case oForwardX11Timeout:
		intptr = &options->forward_x11_timeout;
		goto parse_time;

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

	case oExitOnForwardFailure:
		intptr = &options->exit_on_forward_failure;
		goto parse_flag;

	case oUsePrivilegedPort:
		intptr = &options->use_privileged_port;
		goto parse_flag;

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

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

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

	case oKbdInteractiveDevices:
		charptr = &options->kbd_interactive_devices;
		goto parse_string;

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

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

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

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

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

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

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

	case oGssDelegateCreds:
		intptr = &options->gss_deleg_creds;
		goto parse_flag;

	case oGssTrustDns:
		intptr = &options->gss_trust_dns;
		goto parse_flag;

	case oGssClientIdentity:
		charptr = &options->gss_client_identity;
		goto parse_string;

	case oGssServerIdentity:
		charptr = &options->gss_server_identity;
		goto parse_string;

	case oGssRenewalRekey:
		intptr = &options->gss_renewal_rekey;
		goto parse_flag;

	case oBatchMode:
		intptr = &options->batch_mode;
		goto parse_flag;

	case oCheckHostIP:
		intptr = &options->check_host_ip;
		goto parse_flag;

	case oVerifyHostKeyDNS:
		intptr = &options->verify_host_key_dns;
		goto parse_yesnoask;

	case oStrictHostKeyChecking:
		intptr = &options->strict_host_key_checking;
parse_yesnoask:
		arg = strdelim(&s);
		if (!arg || *arg == '\0')
			fatal("%.200s line %d: Missing yes/no/ask argument.",
			    filename, linenum);
		value = 0;	/* To avoid compiler warning... */
		if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0)
			value = 1;
		else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0)
			value = 0;
		else if (strcmp(arg, "ask") == 0)
			value = 2;
		else
			fatal("%.200s line %d: Bad yes/no/ask argument.", filename, linenum);
		if (*activep && *intptr == -1)
			*intptr = value;
		break;

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

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

	case oNoHostAuthenticationForLocalhost:
		intptr = &options->no_host_authentication_for_localhost;
		goto parse_flag;

	case oNumberOfPasswordPrompts:
		intptr = &options->number_of_password_prompts;
		goto parse_int;

	case oCompressionLevel:
		intptr = &options->compression_level;
		goto parse_int;

	case oRekeyLimit:
		arg = strdelim(&s);
		if (!arg || *arg == '\0')
			fatal("%.200s line %d: Missing argument.", filename, linenum);
		if (arg[0] < '0' || arg[0] > '9')
			fatal("%.200s line %d: Bad number.", filename, linenum);
		orig = val64 = strtoll(arg, &endofnumber, 10);
		if (arg == endofnumber)
			fatal("%.200s line %d: Bad number.", filename, linenum);
		switch (toupper(*endofnumber)) {
		case '\0':
			scale = 1;
			break;
		case 'K':
			scale = 1<<10;
			break;
		case 'M':
			scale = 1<<20;
			break;
		case 'G':
			scale = 1<<30;
			break;
		default:
			fatal("%.200s line %d: Invalid RekeyLimit suffix",
			    filename, linenum);
		}
		val64 *= scale;
		/* detect integer wrap and too-large limits */
		if ((val64 / scale) != orig || val64 > UINT_MAX)
			fatal("%.200s line %d: RekeyLimit too large",
			    filename, linenum);
		if (val64 < 16)
			fatal("%.200s line %d: RekeyLimit too small",
			    filename, linenum);
		if (*activep && options->rekey_limit == -1)
			options->rekey_limit = (u_int32_t)val64;
		break;

	case oIdentityFile:
		arg = strdelim(&s);
		if (!arg || *arg == '\0')
			fatal("%.200s line %d: Missing argument.", filename, linenum);
		if (*activep) {
			intptr = &options->num_identity_files;
			if (*intptr >= SSH_MAX_IDENTITY_FILES)
				fatal("%.200s line %d: Too many identity files specified (max %d).",
				    filename, linenum, SSH_MAX_IDENTITY_FILES);
			charptr = &options->identity_files[*intptr];
			*charptr = xstrdup(arg);
			*intptr = *intptr + 1;
		}
		break;

	case oXAuthLocation:
		charptr=&options->xauth_location;
		goto parse_string;

	case oUser:
		charptr = &options->user;
parse_string:
		arg = strdelim(&s);
		if (!arg || *arg == '\0')
			fatal("%.200s line %d: Missing argument.", filename, linenum);
		if (*activep && *charptr == NULL)
			*charptr = xstrdup(arg);
		break;

	case oGlobalKnownHostsFile:
		charptr = &options->system_hostfile;
		goto parse_string;

	case oUserKnownHostsFile:
		charptr = &options->user_hostfile;
		goto parse_string;

	case oGlobalKnownHostsFile2:
		charptr = &options->system_hostfile2;
		goto parse_string;

	case oUserKnownHostsFile2:
		charptr = &options->user_hostfile2;
		goto parse_string;

	case oHostName:
		charptr = &options->hostname;
		goto parse_string;

	case oHostKeyAlias:
		charptr = &options->host_key_alias;
		goto parse_string;

	case oPreferredAuthentications:
		charptr = &options->preferred_authentications;
		goto parse_string;

	case oBindAddress:
		charptr = &options->bind_address;
		goto parse_string;

	case oPKCS11Provider:
		charptr = &options->pkcs11_provider;
		goto parse_string;

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

	case oPort:
		intptr = &options->port;
parse_int:
		arg = strdelim(&s);
		if (!arg || *arg == '\0')
			fatal("%.200s line %d: Missing argument.", filename, linenum);
		if (arg[0] < '0' || arg[0] > '9')
			fatal("%.200s line %d: Bad number.", filename, linenum);

		/* Octal, decimal, or hex format? */
		value = strtol(arg, &endofnumber, 0);
		if (arg == endofnumber)
			fatal("%.200s line %d: Bad number.", filename, linenum);
		if (*activep && *intptr == -1)
			*intptr = value;
		break;

	case oConnectionAttempts:
		intptr = &options->connection_attempts;
		goto parse_int;

	case oCipher:
		intptr = &options->cipher;
		arg = strdelim(&s);
		if (!arg || *arg == '\0')
			fatal("%.200s line %d: Missing argument.", filename, linenum);
		value = cipher_number(arg);
		if (value == -1)
			fatal("%.200s line %d: Bad cipher '%s'.",
			    filename, linenum, arg ? arg : "<NONE>");
		if (*activep && *intptr == -1)
			*intptr = value;
		break;

	case oCiphers:
		arg = strdelim(&s);
		if (!arg || *arg == '\0')
			fatal("%.200s line %d: Missing argument.", filename, linenum);
		if (!ciphers_valid(arg))
			fatal("%.200s line %d: Bad SSH2 cipher spec '%s'.",
			    filename, linenum, arg ? arg : "<NONE>");
		if (*activep && options->ciphers == NULL)
			options->ciphers = xstrdup(arg);
		break;

	case oMacs:
		arg = strdelim(&s);
		if (!arg || *arg == '\0')
			fatal("%.200s line %d: Missing argument.", filename, linenum);
		if (!mac_valid(arg))
			fatal("%.200s line %d: Bad SSH2 Mac spec '%s'.",
			    filename, linenum, arg ? arg : "<NONE>");
		if (*activep && options->macs == NULL)
			options->macs = xstrdup(arg);
		break;

	case oKexAlgorithms:
		arg = strdelim(&s);
		if (!arg || *arg == '\0')
			fatal("%.200s line %d: Missing argument.",
			    filename, linenum);
		if (!kex_names_valid(arg))
			fatal("%.200s line %d: Bad SSH2 KexAlgorithms '%s'.",
			    filename, linenum, arg ? arg : "<NONE>");
		if (*activep && options->kex_algorithms == NULL)
			options->kex_algorithms = xstrdup(arg);
		break;

	case oHostKeyAlgorithms:
		arg = strdelim(&s);
		if (!arg || *arg == '\0')
			fatal("%.200s line %d: Missing argument.", filename, linenum);
		if (!key_names_valid2(arg))
			fatal("%.200s line %d: Bad protocol 2 host key algorithms '%s'.",
			    filename, linenum, arg ? arg : "<NONE>");
		if (*activep && options->hostkeyalgorithms == NULL)
			options->hostkeyalgorithms = xstrdup(arg);
		break;

	case oProtocol:
		intptr = &options->protocol;
		arg = strdelim(&s);
		if (!arg || *arg == '\0')
			fatal("%.200s line %d: Missing argument.", filename, linenum);
		value = proto_spec(arg);
		if (value == SSH_PROTO_UNKNOWN)
			fatal("%.200s line %d: Bad protocol spec '%s'.",
			    filename, linenum, arg ? arg : "<NONE>");
		if (*activep && *intptr == SSH_PROTO_UNKNOWN)
			*intptr = value;
		break;

	case oLogLevel:
		log_level_ptr = &options->log_level;
		arg = strdelim(&s);
		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 (*activep && *log_level_ptr == SYSLOG_LEVEL_NOT_SET)
			*log_level_ptr = (LogLevel) value;
		break;

	case oLocalForward:
	case oRemoteForward:
	case oDynamicForward:
		arg = strdelim(&s);
		if (arg == NULL || *arg == '\0')
			fatal("%.200s line %d: Missing port argument.",
			    filename, linenum);

		if (opcode == oLocalForward ||
		    opcode == oRemoteForward) {
			arg2 = strdelim(&s);
			if (arg2 == NULL || *arg2 == '\0')
				fatal("%.200s line %d: Missing target argument.",
				    filename, linenum);

			/* construct a string for parse_forward */
			snprintf(fwdarg, sizeof(fwdarg), "%s:%s", arg, arg2);
		} else if (opcode == oDynamicForward) {
			strlcpy(fwdarg, arg, sizeof(fwdarg));
		}

		if (parse_forward(&fwd, fwdarg,
		    opcode == oDynamicForward ? 1 : 0,
		    opcode == oRemoteForward ? 1 : 0) == 0)
			fatal("%.200s line %d: Bad forwarding specification.",
			    filename, linenum);

		if (*activep) {
			if (opcode == oLocalForward ||
			    opcode == oDynamicForward)
				add_local_forward(options, &fwd);
			else if (opcode == oRemoteForward)
				add_remote_forward(options, &fwd);
		}
		break;

	case oClearAllForwardings:
		intptr = &options->clear_forwardings;
		goto parse_flag;

	case oHost:
		*activep = 0;
		while ((arg = strdelim(&s)) != NULL && *arg != '\0')
			if (match_pattern(host, arg)) {
				debug("Applying options for %.100s", arg);
				*activep = 1;
				break;
			}
		/* Avoid garbage check below, as strdelim is done. */
		return 0;

	case oEscapeChar:
		intptr = &options->escape_char;
		arg = strdelim(&s);
		if (!arg || *arg == '\0')
			fatal("%.200s line %d: Missing argument.", filename, linenum);
		if (arg[0] == '^' && arg[2] == 0 &&
		    (u_char) arg[1] >= 64 && (u_char) arg[1] < 128)
			value = (u_char) arg[1] & 31;
		else if (strlen(arg) == 1)
			value = (u_char) arg[0];
		else if (strcmp(arg, "none") == 0)
			value = SSH_ESCAPECHAR_NONE;
		else {
			fatal("%.200s line %d: Bad escape character.",
			    filename, linenum);
			/* NOTREACHED */
			value = 0;	/* Avoid compiler warning. */
		}
		if (*activep && *intptr == -1)
			*intptr = value;
		break;

	case oAddressFamily:
		arg = strdelim(&s);
		if (!arg || *arg == '\0')
			fatal("%s line %d: missing address family.",
			    filename, linenum);
		intptr = &options->address_family;
		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("Unsupported AddressFamily \"%s\"", arg);
		if (*activep && *intptr == -1)
			*intptr = value;
		break;

	case oEnableSSHKeysign:
		intptr = &options->enable_ssh_keysign;
		goto parse_flag;

	case oIdentitiesOnly:
		intptr = &options->identities_only;
		goto parse_flag;

	case oServerAliveInterval:
		intptr = &options->server_alive_interval;
		goto parse_time;

	case oServerAliveCountMax:
		intptr = &options->server_alive_count_max;
		goto parse_int;

	case oSendEnv:
		while ((arg = strdelim(&s)) != NULL && *arg != '\0') {
			if (strchr(arg, '=') != NULL)
				fatal("%s line %d: Invalid environment name.",
				    filename, linenum);
			if (!*activep)
				continue;
			if (options->num_send_env >= MAX_SEND_ENV)
				fatal("%s line %d: too many send env.",
				    filename, linenum);
			options->send_env[options->num_send_env++] =
			    xstrdup(arg);
		}
		break;

	case oControlPath:
		charptr = &options->control_path;
		goto parse_string;

	case oControlMaster:
		intptr = &options->control_master;
		arg = strdelim(&s);
		if (!arg || *arg == '\0')
			fatal("%.200s line %d: Missing ControlMaster argument.",
			    filename, linenum);
		value = 0;	/* To avoid compiler warning... */
		if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0)
			value = SSHCTL_MASTER_YES;
		else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0)
			value = SSHCTL_MASTER_NO;
		else if (strcmp(arg, "auto") == 0)
			value = SSHCTL_MASTER_AUTO;
		else if (strcmp(arg, "ask") == 0)
			value = SSHCTL_MASTER_ASK;
		else if (strcmp(arg, "autoask") == 0)
			value = SSHCTL_MASTER_AUTO_ASK;
		else
			fatal("%.200s line %d: Bad ControlMaster argument.",
			    filename, linenum);
		if (*activep && *intptr == -1)
			*intptr = value;
		break;

	case oControlPersist:
		/* no/false/yes/true, or a time spec */
		intptr = &options->control_persist;
		arg = strdelim(&s);
		if (!arg || *arg == '\0')
			fatal("%.200s line %d: Missing ControlPersist"
			    " argument.", filename, linenum);
		value = 0;
		value2 = 0;	/* timeout */
		if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0)
			value = 0;
		else if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0)
			value = 1;
		else if ((value2 = convtime(arg)) >= 0)
			value = 1;
		else
			fatal("%.200s line %d: Bad ControlPersist argument.",
			    filename, linenum);
		if (*activep && *intptr == -1) {
			*intptr = value;
			options->control_persist_timeout = value2;
		}
		break;

	case oHashKnownHosts:
		intptr = &options->hash_known_hosts;
		goto parse_flag;

	case oTunnel:
		intptr = &options->tun_open;
		arg = strdelim(&s);
		if (!arg || *arg == '\0')
			fatal("%s line %d: Missing yes/point-to-point/"
			    "ethernet/no argument.", filename, linenum);
		value = 0;	/* silence compiler */
		if (strcasecmp(arg, "ethernet") == 0)
			value = SSH_TUNMODE_ETHERNET;
		else if (strcasecmp(arg, "point-to-point") == 0)
			value = SSH_TUNMODE_POINTOPOINT;
		else if (strcasecmp(arg, "yes") == 0)
			value = SSH_TUNMODE_DEFAULT;
		else if (strcasecmp(arg, "no") == 0)
			value = SSH_TUNMODE_NO;
		else
			fatal("%s line %d: Bad yes/point-to-point/ethernet/"
			    "no argument: %s", filename, linenum, arg);
		if (*activep)
			*intptr = value;
		break;

	case oTunnelDevice:
		arg = strdelim(&s);
		if (!arg || *arg == '\0')
			fatal("%.200s line %d: Missing argument.", filename, linenum);
		value = a2tun(arg, &value2);
		if (value == SSH_TUNID_ERR)
			fatal("%.200s line %d: Bad tun device.", filename, linenum);
		if (*activep) {
			options->tun_local = value;
			options->tun_remote = value2;
		}
		break;

	case oLocalCommand:
		charptr = &options->local_command;
		goto parse_command;

	case oPermitLocalCommand:
		intptr = &options->permit_local_command;
		goto parse_flag;

	case oVisualHostKey:
		intptr = &options->visual_host_key;
		goto parse_flag;

	case oIPQoS:
		arg = strdelim(&s);
		if ((value = parse_ipqos(arg)) == -1)
			fatal("%s line %d: Bad IPQoS value: %s",
			    filename, linenum, arg);
		arg = strdelim(&s);
		if (arg == NULL)
			value2 = value;
		else if ((value2 = parse_ipqos(arg)) == -1)
			fatal("%s line %d: Bad IPQoS value: %s",
			    filename, linenum, arg);
		if (*activep) {
			options->ip_qos_interactive = value;
			options->ip_qos_bulk = value2;
		}
		break;

	case oUseRoaming:
		intptr = &options->use_roaming;
		goto parse_flag;

	case oDeprecated:
		debug("%s line %d: Deprecated option \"%s\"",
		    filename, linenum, keyword);
		return 0;

	case oUnsupported:
		error("%s line %d: Unsupported option \"%s\"",
		    filename, linenum, keyword);
		return 0;

	default:
		fatal("process_config_line: Unimplemented opcode %d", opcode);
	}

	/* Check that there is no garbage at end of line. */
	if ((arg = strdelim(&s)) != NULL && *arg != '\0') {
		fatal("%.200s line %d: garbage at end of line; \"%.200s\".",
		    filename, linenum, arg);
	}
	return 0;
}
Esempio n. 2
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;
}
Esempio n. 3
0
int
main(int argc, char **argv)
{
    int debug_flag = 0, log_level = SYSLOG_LEVEL_INFO;
    int opt, fopt_count = 0, j;
    char *tname, *cp, line[NI_MAXHOST];
    FILE *fp;
    u_long linenum;

    extern int optind;
    extern char *optarg;

    __progname = ssh_get_progname(argv[0]);
    seed_rng();
    TAILQ_INIT(&tq);

    /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
    sanitise_stdfd();

    if (argc <= 1)
        usage();

    while ((opt = getopt(argc, argv, "Hv46p:T:t:f:")) != -1) {
        switch (opt) {
        case 'H':
            hash_hosts = 1;
            break;
        case 'p':
            ssh_port = a2port(optarg);
            if (ssh_port <= 0) {
                fprintf(stderr, "Bad port '%s'\n", optarg);
                exit(1);
            }
            break;
        case 'T':
            timeout = convtime(optarg);
            if (timeout == -1 || timeout == 0) {
                fprintf(stderr, "Bad timeout '%s'\n", optarg);
                usage();
            }
            break;
        case 'v':
            if (!debug_flag) {
                debug_flag = 1;
                log_level = SYSLOG_LEVEL_DEBUG1;
            }
            else if (log_level < SYSLOG_LEVEL_DEBUG3)
                log_level++;
            else
                fatal("Too high debugging level.");
            break;
        case 'f':
            if (strcmp(optarg, "-") == 0)
                optarg = NULL;
            argv[fopt_count++] = optarg;
            break;
        case 't':
            get_keytypes = 0;
            tname = strtok(optarg, ",");
            while (tname) {
                int type = key_type_from_name(tname);
                switch (type) {
                case KEY_RSA1:
                    get_keytypes |= KT_RSA1;
                    break;
                case KEY_DSA:
                    get_keytypes |= KT_DSA;
                    break;
                case KEY_ECDSA:
                    get_keytypes |= KT_ECDSA;
                    break;
                case KEY_RSA:
                    get_keytypes |= KT_RSA;
                    break;
                case KEY_ED25519:
                    get_keytypes |= KT_ED25519;
                    break;
                case KEY_UNSPEC:
                    fatal("unknown key type %s", tname);
                }
                tname = strtok(NULL, ",");
            }
            break;
        case '4':
            IPv4or6 = AF_INET;
            break;
        case '6':
            IPv4or6 = AF_INET6;
            break;
        case '?':
        default:
            usage();
        }
    }
    if (optind == argc && !fopt_count)
        usage();

    log_init("ssh-keyscan", log_level, SYSLOG_FACILITY_USER, 1);

    maxfd = fdlim_get(1);
    if (maxfd < 0)
        fatal("%s: fdlim_get: bad value", __progname);
    if (maxfd > MAXMAXFD)
        maxfd = MAXMAXFD;
    if (MAXCON <= 0)
        fatal("%s: not enough file descriptors", __progname);
    if (maxfd > fdlim_get(0))
        fdlim_set(maxfd);
    fdcon = xcalloc(maxfd, sizeof(con));

    read_wait_nfdset = howmany(maxfd, NFDBITS);
    read_wait = xcalloc(read_wait_nfdset, sizeof(fd_mask));

    for (j = 0; j < fopt_count; j++) {
        if (argv[j] == NULL)
            fp = stdin;
        else if ((fp = fopen(argv[j], "r")) == NULL)
            fatal("%s: %s: %s", __progname, argv[j],
                  strerror(errno));
        linenum = 0;

        while (read_keyfile_line(fp,
                                 argv[j] == NULL ? "(stdin)" : argv[j], line, sizeof(line),
                                 &linenum) != -1) {
            /* Chomp off trailing whitespace and comments */
            if ((cp = strchr(line, '#')) == NULL)
                cp = line + strlen(line) - 1;
            while (cp >= line) {
                if (*cp == ' ' || *cp == '\t' ||
                        *cp == '\n' || *cp == '#')
                    *cp-- = '\0';
                else
                    break;
            }

            /* Skip empty lines */
            if (*line == '\0')
                continue;

            do_host(line);
        }

        if (ferror(fp))
            fatal("%s: %s: %s", __progname, argv[j],
                  strerror(errno));

        fclose(fp);
    }

    while (optind < argc)
        do_host(argv[optind++]);

    while (ncon > 0)
        conloop();

    return (0);
}
Esempio n. 4
0
int
process_config_line(Options *options, const char *host,
		    char *line, const char *filename, int linenum,
		    int *activep)
{
	char buf[256], *s, **charptr, *endofnumber, *keyword, *arg;
	int opcode, *intptr, value;
	size_t len;
	u_short fwd_port, fwd_host_port;
	char sfwd_host_port[6];

	/* Strip trailing whitespace */
	for(len = strlen(line) - 1; len > 0; len--) {
		if (strchr(WHITESPACE, line[len]) == NULL)
			break;
		line[len] = '\0';
	}

	s = line;
	/* Get the keyword. (Each line is supposed to begin with a keyword). */
	keyword = strdelim(&s);
	/* Ignore leading whitespace. */
	if (*keyword == '\0')
		keyword = strdelim(&s);
	if (keyword == NULL || !*keyword || *keyword == '\n' || *keyword == '#')
		return 0;

	opcode = parse_token(keyword, filename, linenum);

	switch (opcode) {
	case oBadOption:
		/* don't panic, but count bad options */
		return -1;
		/* NOTREACHED */
	case oConnectTimeout:
		intptr = &options->connection_timeout;
parse_time:
		arg = strdelim(&s);
		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 oForwardAgent:
		intptr = &options->forward_agent;
parse_flag:
		arg = strdelim(&s);
		if (!arg || *arg == '\0')
			fatal("%.200s line %d: Missing yes/no argument.", filename, linenum);
		value = 0;	/* To avoid compiler warning... */
		if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0)
			value = 1;
		else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0)
			value = 0;
		else
			fatal("%.200s line %d: Bad yes/no argument.", filename, linenum);
		if (*activep && *intptr == -1)
			*intptr = value;
		break;

	case oForwardX11:
		intptr = &options->forward_x11;
		goto parse_flag;

	case oForwardX11Trusted:
		intptr = &options->forward_x11_trusted;
		goto parse_flag;

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

	case oUsePrivilegedPort:
		intptr = &options->use_privileged_port;
		goto parse_flag;

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

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

	case oKbdInteractiveDevices:
		charptr = &options->kbd_interactive_devices;
		goto parse_string;

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

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

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

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

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

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

	case oGssDelegateCreds:
		intptr = &options->gss_deleg_creds;
		goto parse_flag;

	case oBatchMode:
		intptr = &options->batch_mode;
		goto parse_flag;

	case oCheckHostIP:
		intptr = &options->check_host_ip;
		goto parse_flag;

	case oVerifyHostKeyDNS:
		intptr = &options->verify_host_key_dns;
		goto parse_yesnoask;

	case oStrictHostKeyChecking:
		intptr = &options->strict_host_key_checking;
parse_yesnoask:
		arg = strdelim(&s);
		if (!arg || *arg == '\0')
			fatal("%.200s line %d: Missing yes/no/ask argument.",
			    filename, linenum);
		value = 0;	/* To avoid compiler warning... */
		if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0)
			value = 1;
		else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0)
			value = 0;
		else if (strcmp(arg, "ask") == 0)
			value = 2;
		else
			fatal("%.200s line %d: Bad yes/no/ask argument.", filename, linenum);
		if (*activep && *intptr == -1)
			*intptr = value;
		break;

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

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

	case oNoHostAuthenticationForLocalhost:
		intptr = &options->no_host_authentication_for_localhost;
		goto parse_flag;

	case oNumberOfPasswordPrompts:
		intptr = &options->number_of_password_prompts;
		goto parse_int;

	case oCompressionLevel:
		intptr = &options->compression_level;
		goto parse_int;

	case oRekeyLimit:
		intptr = &options->rekey_limit;
		arg = strdelim(&s);
		if (!arg || *arg == '\0')
			fatal("%.200s line %d: Missing argument.", filename, linenum);
		if (arg[0] < '0' || arg[0] > '9')
			fatal("%.200s line %d: Bad number.", filename, linenum);
		value = strtol(arg, &endofnumber, 10);
		if (arg == endofnumber)
			fatal("%.200s line %d: Bad number.", filename, linenum);
		switch (toupper(*endofnumber)) {
		case 'K':
			value *= 1<<10;
			break;
		case 'M':
			value *= 1<<20;
			break;
		case 'G':
			value *= 1<<30;
			break;
		}
		if (*activep && *intptr == -1)
			*intptr = value;
		break;

	case oIdentityFile:
		arg = strdelim(&s);
		if (!arg || *arg == '\0')
			fatal("%.200s line %d: Missing argument.", filename, linenum);
		if (*activep) {
			intptr = &options->num_identity_files;
			if (*intptr >= SSH_MAX_IDENTITY_FILES)
				fatal("%.200s line %d: Too many identity files specified (max %d).",
				    filename, linenum, SSH_MAX_IDENTITY_FILES);
			charptr =  &options->identity_files[*intptr];
			*charptr = xstrdup(arg);
			*intptr = *intptr + 1;
		}
		break;

	case oXAuthLocation:
		charptr=&options->xauth_location;
		goto parse_string;

	case oUser:
		charptr = &options->user;
parse_string:
		arg = strdelim(&s);
		if (!arg || *arg == '\0')
			fatal("%.200s line %d: Missing argument.", filename, linenum);
		if (*activep && *charptr == NULL)
			*charptr = xstrdup(arg);
		break;

	case oGlobalKnownHostsFile:
		charptr = &options->system_hostfile;
		goto parse_string;

	case oUserKnownHostsFile:
		charptr = &options->user_hostfile;
		goto parse_string;

	case oGlobalKnownHostsFile2:
		charptr = &options->system_hostfile2;
		goto parse_string;

	case oUserKnownHostsFile2:
		charptr = &options->user_hostfile2;
		goto parse_string;

	case oHostName:
		charptr = &options->hostname;
		goto parse_string;

	case oHostKeyAlias:
		charptr = &options->host_key_alias;
		goto parse_string;

	case oPreferredAuthentications:
		charptr = &options->preferred_authentications;
		goto parse_string;

	case oBindAddress:
		charptr = &options->bind_address;
		goto parse_string;

	case oSmartcardDevice:
		charptr = &options->smartcard_device;
		goto parse_string;

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

	case oPort:
		intptr = &options->port;
parse_int:
		arg = strdelim(&s);
		if (!arg || *arg == '\0')
			fatal("%.200s line %d: Missing argument.", filename, linenum);
		if (arg[0] < '0' || arg[0] > '9')
			fatal("%.200s line %d: Bad number.", filename, linenum);

		/* Octal, decimal, or hex format? */
		value = strtol(arg, &endofnumber, 0);
		if (arg == endofnumber)
			fatal("%.200s line %d: Bad number.", filename, linenum);
		if (*activep && *intptr == -1)
			*intptr = value;
		break;

	case oConnectionAttempts:
		intptr = &options->connection_attempts;
		goto parse_int;

	case oCipher:
		intptr = &options->cipher;
		arg = strdelim(&s);
		if (!arg || *arg == '\0')
			fatal("%.200s line %d: Missing argument.", filename, linenum);
		value = cipher_number(arg);
		if (value == -1)
			fatal("%.200s line %d: Bad cipher '%s'.",
			    filename, linenum, arg ? arg : "<NONE>");
		if (*activep && *intptr == -1)
			*intptr = value;
		break;

	case oCiphers:
		arg = strdelim(&s);
		if (!arg || *arg == '\0')
			fatal("%.200s line %d: Missing argument.", filename, linenum);
		if (!ciphers_valid(arg))
			fatal("%.200s line %d: Bad SSH2 cipher spec '%s'.",
			    filename, linenum, arg ? arg : "<NONE>");
		if (*activep && options->ciphers == NULL)
			options->ciphers = xstrdup(arg);
		break;

	case oMacs:
		arg = strdelim(&s);
		if (!arg || *arg == '\0')
			fatal("%.200s line %d: Missing argument.", filename, linenum);
		if (!mac_valid(arg))
			fatal("%.200s line %d: Bad SSH2 Mac spec '%s'.",
			    filename, linenum, arg ? arg : "<NONE>");
		if (*activep && options->macs == NULL)
			options->macs = xstrdup(arg);
		break;

	case oHostKeyAlgorithms:
		arg = strdelim(&s);
		if (!arg || *arg == '\0')
			fatal("%.200s line %d: Missing argument.", filename, linenum);
		if (!key_names_valid2(arg))
			fatal("%.200s line %d: Bad protocol 2 host key algorithms '%s'.",
			    filename, linenum, arg ? arg : "<NONE>");
		if (*activep && options->hostkeyalgorithms == NULL)
			options->hostkeyalgorithms = xstrdup(arg);
		break;

	case oProtocol:
		intptr = &options->protocol;
		arg = strdelim(&s);
		if (!arg || *arg == '\0')
			fatal("%.200s line %d: Missing argument.", filename, linenum);
		value = proto_spec(arg);
		if (value == SSH_PROTO_UNKNOWN)
			fatal("%.200s line %d: Bad protocol spec '%s'.",
			    filename, linenum, arg ? arg : "<NONE>");
		if (*activep && *intptr == SSH_PROTO_UNKNOWN)
			*intptr = value;
		break;

	case oLogLevel:
		intptr = (int *) &options->log_level;
		arg = strdelim(&s);
		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 (*activep && (LogLevel) *intptr == SYSLOG_LEVEL_NOT_SET)
			*intptr = (LogLevel) value;
		break;

	case oLocalForward:
	case oRemoteForward:
		arg = strdelim(&s);
		if (!arg || *arg == '\0')
			fatal("%.200s line %d: Missing port argument.",
			    filename, linenum);
		if ((fwd_port = a2port(arg)) == 0)
			fatal("%.200s line %d: Bad listen port.",
			    filename, linenum);
		arg = strdelim(&s);
		if (!arg || *arg == '\0')
			fatal("%.200s line %d: Missing second argument.",
			    filename, linenum);
		if (sscanf(arg, "%255[^:]:%5[0-9]", buf, sfwd_host_port) != 2 &&
		    sscanf(arg, "%255[^/]/%5[0-9]", buf, sfwd_host_port) != 2)
			fatal("%.200s line %d: Bad forwarding specification.",
			    filename, linenum);
		if ((fwd_host_port = a2port(sfwd_host_port)) == 0)
			fatal("%.200s line %d: Bad forwarding port.",
			    filename, linenum);
		if (*activep) {
			if (opcode == oLocalForward)
				add_local_forward(options, fwd_port, buf,
				    fwd_host_port);
			else if (opcode == oRemoteForward)
				add_remote_forward(options, fwd_port, buf,
				    fwd_host_port);
		}
		break;

	case oDynamicForward:
		arg = strdelim(&s);
		if (!arg || *arg == '\0')
			fatal("%.200s line %d: Missing port argument.",
			    filename, linenum);
		fwd_port = a2port(arg);
		if (fwd_port == 0)
			fatal("%.200s line %d: Badly formatted port number.",
			    filename, linenum);
		if (*activep)
			add_local_forward(options, fwd_port, "socks", 0);
		break;

	case oClearAllForwardings:
		intptr = &options->clear_forwardings;
		goto parse_flag;

	case oHost:
		*activep = 0;
		while ((arg = strdelim(&s)) != NULL && *arg != '\0')
			if (match_pattern(host, arg)) {
				debug("Applying options for %.100s", arg);
				*activep = 1;
				break;
			}
		/* Avoid garbage check below, as strdelim is done. */
		return 0;

	case oEscapeChar:
		intptr = &options->escape_char;
		arg = strdelim(&s);
		if (!arg || *arg == '\0')
			fatal("%.200s line %d: Missing argument.", filename, linenum);
		if (arg[0] == '^' && arg[2] == 0 &&
		    (u_char) arg[1] >= 64 && (u_char) arg[1] < 128)
			value = (u_char) arg[1] & 31;
		else if (strlen(arg) == 1)
			value = (u_char) arg[0];
		else if (strcmp(arg, "none") == 0)
			value = SSH_ESCAPECHAR_NONE;
		else {
			fatal("%.200s line %d: Bad escape character.",
			    filename, linenum);
			/* NOTREACHED */
			value = 0;	/* Avoid compiler warning. */
		}
		if (*activep && *intptr == -1)
			*intptr = value;
		break;

	case oAddressFamily:
		arg = strdelim(&s);
		intptr = &options->address_family;
		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("Unsupported AddressFamily \"%s\"", arg);
		if (*activep && *intptr == -1)
			*intptr = value;
		break;

	case oEnableSSHKeysign:
		intptr = &options->enable_ssh_keysign;
		goto parse_flag;

	case oIdentitiesOnly:
		intptr = &options->identities_only;
		goto parse_flag;

	case oServerAliveInterval:
		intptr = &options->server_alive_interval;
		goto parse_time;

	case oServerAliveCountMax:
		intptr = &options->server_alive_count_max;
		goto parse_int;

	case oDeprecated:
		debug("%s line %d: Deprecated option \"%s\"",
		    filename, linenum, keyword);
		return 0;

	case oUnsupported:
		error("%s line %d: Unsupported option \"%s\"",
		    filename, linenum, keyword);
		return 0;

	default:
		fatal("process_config_line: Unimplemented opcode %d", opcode);
	}

	/* Check that there is no garbage at end of line. */
	if ((arg = strdelim(&s)) != NULL && *arg != '\0') {
		fatal("%.200s line %d: garbage at end of line; \"%.200s\".",
		     filename, linenum, arg);
	}
	return 0;
}
Esempio n. 5
0
int
process_config_line(Options *options, const char *host,
		    char *line, const char *filename, int linenum,
		    int *activep, int userconfig)
{
	char *s, **charptr, *endofnumber, *keyword, *arg, *arg2;
	char **cpptr, fwdarg[256];
	u_int i, *uintptr, max_entries = 0;
	int negated, opcode, *intptr, value, value2;
	LogLevel *log_level_ptr;
	long long val64;
	size_t len;
	Forward fwd;

	/* Strip trailing whitespace */
	for (len = strlen(line) - 1; len > 0; len--) {
		if (strchr(WHITESPACE, line[len]) == NULL)
			break;
		line[len] = '\0';
	}

	s = line;
	/* Get the keyword. (Each line is supposed to begin with a keyword). */
	if ((keyword = strdelim(&s)) == NULL)
		return 0;
	/* Ignore leading whitespace. */
	if (*keyword == '\0')
		keyword = strdelim(&s);
	if (keyword == NULL || !*keyword || *keyword == '\n' || *keyword == '#')
		return 0;
	/* Match lowercase keyword */
	for (i = 0; i < strlen(keyword); i++)
		keyword[i] = tolower(keyword[i]);

	opcode = parse_token(keyword, filename, linenum,
	    options->ignored_unknown);

	switch (opcode) {
	case oBadOption:
		/* don't panic, but count bad options */
		return -1;
		/* NOTREACHED */
	case oIgnoredUnknownOption:
		debug("%s line %d: Ignored unknown option \"%s\"",
		    filename, linenum, keyword);
		return 0;
	case oConnectTimeout:
		intptr = &options->connection_timeout;
parse_time:
		arg = strdelim(&s);
		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 (*activep && *intptr == -1)
			*intptr = value;
		break;

	case oForwardAgent:
		intptr = &options->forward_agent;
parse_flag:
		arg = strdelim(&s);
		if (!arg || *arg == '\0')
			fatal("%.200s line %d: Missing yes/no argument.", filename, linenum);
		value = 0;	/* To avoid compiler warning... */
		if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0)
			value = 1;
		else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0)
			value = 0;
		else
			fatal("%.200s line %d: Bad yes/no argument.", filename, linenum);
		if (*activep && *intptr == -1)
			*intptr = value;
		break;

	case oForwardX11:
		intptr = &options->forward_x11;
		goto parse_flag;

	case oForwardX11Trusted:
		intptr = &options->forward_x11_trusted;
		goto parse_flag;
	
	case oForwardX11Timeout:
		intptr = &options->forward_x11_timeout;
		goto parse_time;

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

	case oExitOnForwardFailure:
		intptr = &options->exit_on_forward_failure;
		goto parse_flag;

	case oUsePrivilegedPort:
		intptr = &options->use_privileged_port;
		goto parse_flag;

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

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

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

	case oKbdInteractiveDevices:
		charptr = &options->kbd_interactive_devices;
		goto parse_string;

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

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

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

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

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

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

	case oGssDelegateCreds:
		intptr = &options->gss_deleg_creds;
		goto parse_flag;

	case oBatchMode:
		intptr = &options->batch_mode;
		goto parse_flag;

	case oCheckHostIP:
		intptr = &options->check_host_ip;
		goto parse_flag;

	case oVerifyHostKeyDNS:
		intptr = &options->verify_host_key_dns;
		goto parse_yesnoask;

	case oStrictHostKeyChecking:
		intptr = &options->strict_host_key_checking;
parse_yesnoask:
		arg = strdelim(&s);
		if (!arg || *arg == '\0')
			fatal("%.200s line %d: Missing yes/no/ask argument.",
			    filename, linenum);
		value = 0;	/* To avoid compiler warning... */
		if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0)
			value = 1;
		else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0)
			value = 0;
		else if (strcmp(arg, "ask") == 0)
			value = 2;
		else
			fatal("%.200s line %d: Bad yes/no/ask argument.", filename, linenum);
		if (*activep && *intptr == -1)
			*intptr = value;
		break;

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

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

	case oNoHostAuthenticationForLocalhost:
		intptr = &options->no_host_authentication_for_localhost;
		goto parse_flag;

	case oNumberOfPasswordPrompts:
		intptr = &options->number_of_password_prompts;
		goto parse_int;

	case oCompressionLevel:
		intptr = &options->compression_level;
		goto parse_int;

	case oRekeyLimit:
		arg = strdelim(&s);
		if (!arg || *arg == '\0')
			fatal("%.200s line %d: Missing argument.", filename,
			    linenum);
		if (strcmp(arg, "default") == 0) {
			val64 = 0;
		} else {
			if (scan_scaled(arg, &val64) == -1)
				fatal("%.200s line %d: Bad number '%s': %s",
				    filename, linenum, arg, strerror(errno));
			/* check for too-large or too-small limits */
			if (val64 > UINT_MAX)
				fatal("%.200s line %d: RekeyLimit too large",
				    filename, linenum);
			if (val64 != 0 && val64 < 16)
				fatal("%.200s line %d: RekeyLimit too small",
				    filename, linenum);
		}
		if (*activep && options->rekey_limit == -1)
			options->rekey_limit = (u_int32_t)val64;
		if (s != NULL) { /* optional rekey interval present */
			if (strcmp(s, "none") == 0) {
				(void)strdelim(&s);	/* discard */
				break;
			}
			intptr = &options->rekey_interval;
			goto parse_time;
		}
		break;

	case oIdentityFile:
		arg = strdelim(&s);
		if (!arg || *arg == '\0')
			fatal("%.200s line %d: Missing argument.", filename, linenum);
		if (*activep) {
			intptr = &options->num_identity_files;
			if (*intptr >= SSH_MAX_IDENTITY_FILES)
				fatal("%.200s line %d: Too many identity files specified (max %d).",
				    filename, linenum, SSH_MAX_IDENTITY_FILES);
			add_identity_file(options, NULL, arg, userconfig);
		}
		break;

	case oXAuthLocation:
		charptr=&options->xauth_location;
		goto parse_string;

	case oUser:
		charptr = &options->user;
parse_string:
		arg = strdelim(&s);
		if (!arg || *arg == '\0')
			fatal("%.200s line %d: Missing argument.",
			    filename, linenum);
		if (*activep && *charptr == NULL)
			*charptr = xstrdup(arg);
		break;

	case oGlobalKnownHostsFile:
		cpptr = (char **)&options->system_hostfiles;
		uintptr = &options->num_system_hostfiles;
		max_entries = SSH_MAX_HOSTS_FILES;
parse_char_array:
		if (*activep && *uintptr == 0) {
			while ((arg = strdelim(&s)) != NULL && *arg != '\0') {
				if ((*uintptr) >= max_entries)
					fatal("%s line %d: "
					    "too many authorized keys files.",
					    filename, linenum);
				cpptr[(*uintptr)++] = xstrdup(arg);
			}
		}
		return 0;

	case oUserKnownHostsFile:
		cpptr = (char **)&options->user_hostfiles;
		uintptr = &options->num_user_hostfiles;
		max_entries = SSH_MAX_HOSTS_FILES;
		goto parse_char_array;

	case oHostName:
		charptr = &options->hostname;
		goto parse_string;

	case oHostKeyAlias:
		charptr = &options->host_key_alias;
		goto parse_string;

	case oPreferredAuthentications:
		charptr = &options->preferred_authentications;
		goto parse_string;

	case oBindAddress:
		charptr = &options->bind_address;
		goto parse_string;

	case oPKCS11Provider:
		charptr = &options->pkcs11_provider;
		goto parse_string;

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

	case oPort:
		intptr = &options->port;
parse_int:
		arg = strdelim(&s);
		if (!arg || *arg == '\0')
			fatal("%.200s line %d: Missing argument.", filename, linenum);
		if (arg[0] < '0' || arg[0] > '9')
			fatal("%.200s line %d: Bad number.", filename, linenum);

		/* Octal, decimal, or hex format? */
		value = strtol(arg, &endofnumber, 0);
		if (arg == endofnumber)
			fatal("%.200s line %d: Bad number.", filename, linenum);
		if (*activep && *intptr == -1)
			*intptr = value;
		break;

	case oConnectionAttempts:
		intptr = &options->connection_attempts;
		goto parse_int;

	case oCipher:
		intptr = &options->cipher;
		arg = strdelim(&s);
		if (!arg || *arg == '\0')
			fatal("%.200s line %d: Missing argument.", filename, linenum);
		value = cipher_number(arg);
		if (value == -1)
			fatal("%.200s line %d: Bad cipher '%s'.",
			    filename, linenum, arg ? arg : "<NONE>");
		if (*activep && *intptr == -1)
			*intptr = value;
		break;

	case oCiphers:
		arg = strdelim(&s);
		if (!arg || *arg == '\0')
			fatal("%.200s line %d: Missing argument.", filename, linenum);
		if (!ciphers_valid(arg))
			fatal("%.200s line %d: Bad SSH2 cipher spec '%s'.",
			    filename, linenum, arg ? arg : "<NONE>");
		if (*activep && options->ciphers == NULL)
			options->ciphers = xstrdup(arg);
		break;

	case oMacs:
		arg = strdelim(&s);
		if (!arg || *arg == '\0')
			fatal("%.200s line %d: Missing argument.", filename, linenum);
		if (!mac_valid(arg))
			fatal("%.200s line %d: Bad SSH2 Mac spec '%s'.",
			    filename, linenum, arg ? arg : "<NONE>");
		if (*activep && options->macs == NULL)
			options->macs = xstrdup(arg);
		break;

	case oKexAlgorithms:
		arg = strdelim(&s);
		if (!arg || *arg == '\0')
			fatal("%.200s line %d: Missing argument.",
			    filename, linenum);
		if (!kex_names_valid(arg))
			fatal("%.200s line %d: Bad SSH2 KexAlgorithms '%s'.",
			    filename, linenum, arg ? arg : "<NONE>");
		if (*activep && options->kex_algorithms == NULL)
			options->kex_algorithms = xstrdup(arg);
		break;

	case oHostKeyAlgorithms:
		arg = strdelim(&s);
		if (!arg || *arg == '\0')
			fatal("%.200s line %d: Missing argument.", filename, linenum);
		if (!key_names_valid2(arg))
			fatal("%.200s line %d: Bad protocol 2 host key algorithms '%s'.",
			    filename, linenum, arg ? arg : "<NONE>");
		if (*activep && options->hostkeyalgorithms == NULL)
			options->hostkeyalgorithms = xstrdup(arg);
		break;

	case oProtocol:
		intptr = &options->protocol;
		arg = strdelim(&s);
		if (!arg || *arg == '\0')
			fatal("%.200s line %d: Missing argument.", filename, linenum);
		value = proto_spec(arg);
		if (value == SSH_PROTO_UNKNOWN)
			fatal("%.200s line %d: Bad protocol spec '%s'.",
			    filename, linenum, arg ? arg : "<NONE>");
		if (*activep && *intptr == SSH_PROTO_UNKNOWN)
			*intptr = value;
		break;

	case oLogLevel:
		log_level_ptr = &options->log_level;
		arg = strdelim(&s);
		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 (*activep && *log_level_ptr == SYSLOG_LEVEL_NOT_SET)
			*log_level_ptr = (LogLevel) value;
		break;

	case oLocalForward:
	case oRemoteForward:
	case oDynamicForward:
		arg = strdelim(&s);
		if (arg == NULL || *arg == '\0')
			fatal("%.200s line %d: Missing port argument.",
			    filename, linenum);

		if (opcode == oLocalForward ||
		    opcode == oRemoteForward) {
			arg2 = strdelim(&s);
			if (arg2 == NULL || *arg2 == '\0')
				fatal("%.200s line %d: Missing target argument.",
				    filename, linenum);

			/* construct a string for parse_forward */
			snprintf(fwdarg, sizeof(fwdarg), "%s:%s", arg, arg2);
		} else if (opcode == oDynamicForward) {
			strlcpy(fwdarg, arg, sizeof(fwdarg));
		}

		if (parse_forward(&fwd, fwdarg,
		    opcode == oDynamicForward ? 1 : 0,
		    opcode == oRemoteForward ? 1 : 0) == 0)
			fatal("%.200s line %d: Bad forwarding specification.",
			    filename, linenum);

		if (*activep) {
			if (opcode == oLocalForward ||
			    opcode == oDynamicForward)
				add_local_forward(options, &fwd);
			else if (opcode == oRemoteForward)
				add_remote_forward(options, &fwd);
		}
		break;

	case oClearAllForwardings:
		intptr = &options->clear_forwardings;
		goto parse_flag;

	case oHost:
		*activep = 0;
		arg2 = NULL;
		while ((arg = strdelim(&s)) != NULL && *arg != '\0') {
			negated = *arg == '!';
			if (negated)
				arg++;
			if (match_pattern(host, arg)) {
				if (negated) {
					debug("%.200s line %d: Skipping Host "
					    "block because of negated match "
					    "for %.100s", filename, linenum,
					    arg);
					*activep = 0;
					break;
				}
				if (!*activep)
					arg2 = arg; /* logged below */
				*activep = 1;
			}
		}
		if (*activep)
			debug("%.200s line %d: Applying options for %.100s",
			    filename, linenum, arg2);
		/* Avoid garbage check below, as strdelim is done. */
		return 0;

	case oEscapeChar:
		intptr = &options->escape_char;
		arg = strdelim(&s);
		if (!arg || *arg == '\0')
			fatal("%.200s line %d: Missing argument.", filename, linenum);
		if (arg[0] == '^' && arg[2] == 0 &&
		    (u_char) arg[1] >= 64 && (u_char) arg[1] < 128)
			value = (u_char) arg[1] & 31;
		else if (strlen(arg) == 1)
			value = (u_char) arg[0];
		else if (strcmp(arg, "none") == 0)
			value = SSH_ESCAPECHAR_NONE;
		else {
			fatal("%.200s line %d: Bad escape character.",
			    filename, linenum);
			/* NOTREACHED */
			value = 0;	/* Avoid compiler warning. */
		}
		if (*activep && *intptr == -1)
			*intptr = value;
		break;

	case oAddressFamily:
		arg = strdelim(&s);
		if (!arg || *arg == '\0')
			fatal("%s line %d: missing address family.",
			    filename, linenum);
		intptr = &options->address_family;
		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("Unsupported AddressFamily \"%s\"", arg);
		if (*activep && *intptr == -1)
			*intptr = value;
		break;

	case oEnableSSHKeysign:
		intptr = &options->enable_ssh_keysign;
		goto parse_flag;

	case oIdentitiesOnly:
		intptr = &options->identities_only;
		goto parse_flag;

	case oServerAliveInterval:
		intptr = &options->server_alive_interval;
		goto parse_time;

	case oServerAliveCountMax:
		intptr = &options->server_alive_count_max;
		goto parse_int;

	case oSendEnv:
		while ((arg = strdelim(&s)) != NULL && *arg != '\0') {
			if (strchr(arg, '=') != NULL)
				fatal("%s line %d: Invalid environment name.",
				    filename, linenum);
			if (!*activep)
				continue;
			if (options->num_send_env >= MAX_SEND_ENV)
				fatal("%s line %d: too many send env.",
				    filename, linenum);
			options->send_env[options->num_send_env++] =
			    xstrdup(arg);
		}
		break;

	case oControlPath:
		charptr = &options->control_path;
		goto parse_string;

	case oControlMaster:
		intptr = &options->control_master;
		arg = strdelim(&s);
		if (!arg || *arg == '\0')
			fatal("%.200s line %d: Missing ControlMaster argument.",
			    filename, linenum);
		value = 0;	/* To avoid compiler warning... */
		if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0)
			value = SSHCTL_MASTER_YES;
		else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0)
			value = SSHCTL_MASTER_NO;
		else if (strcmp(arg, "auto") == 0)
			value = SSHCTL_MASTER_AUTO;
		else if (strcmp(arg, "ask") == 0)
			value = SSHCTL_MASTER_ASK;
		else if (strcmp(arg, "autoask") == 0)
			value = SSHCTL_MASTER_AUTO_ASK;
		else
			fatal("%.200s line %d: Bad ControlMaster argument.",
			    filename, linenum);
		if (*activep && *intptr == -1)
			*intptr = value;
		break;

	case oControlPersist:
		/* no/false/yes/true, or a time spec */
		intptr = &options->control_persist;
		arg = strdelim(&s);
		if (!arg || *arg == '\0')
			fatal("%.200s line %d: Missing ControlPersist"
			    " argument.", filename, linenum);
		value = 0;
		value2 = 0;	/* timeout */
		if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0)
			value = 0;
		else if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0)
			value = 1;
		else if ((value2 = convtime(arg)) >= 0)
			value = 1;
		else
			fatal("%.200s line %d: Bad ControlPersist argument.",
			    filename, linenum);
		if (*activep && *intptr == -1) {
			*intptr = value;
			options->control_persist_timeout = value2;
		}
		break;

	case oHashKnownHosts:
		intptr = &options->hash_known_hosts;
		goto parse_flag;

	case oTunnel:
		intptr = &options->tun_open;
		arg = strdelim(&s);
		if (!arg || *arg == '\0')
			fatal("%s line %d: Missing yes/point-to-point/"
			    "ethernet/no argument.", filename, linenum);
		value = 0;	/* silence compiler */
		if (strcasecmp(arg, "ethernet") == 0)
			value = SSH_TUNMODE_ETHERNET;
		else if (strcasecmp(arg, "point-to-point") == 0)
			value = SSH_TUNMODE_POINTOPOINT;
		else if (strcasecmp(arg, "yes") == 0)
			value = SSH_TUNMODE_DEFAULT;
		else if (strcasecmp(arg, "no") == 0)
			value = SSH_TUNMODE_NO;
		else
			fatal("%s line %d: Bad yes/point-to-point/ethernet/"
			    "no argument: %s", filename, linenum, arg);
		if (*activep)
			*intptr = value;
		break;

	case oTunnelDevice:
		arg = strdelim(&s);
		if (!arg || *arg == '\0')
			fatal("%.200s line %d: Missing argument.", filename, linenum);
		value = a2tun(arg, &value2);
		if (value == SSH_TUNID_ERR)
			fatal("%.200s line %d: Bad tun device.", filename, linenum);
		if (*activep) {
			options->tun_local = value;
			options->tun_remote = value2;
		}
		break;

	case oLocalCommand:
		charptr = &options->local_command;
		goto parse_command;

	case oPermitLocalCommand:
		intptr = &options->permit_local_command;
		goto parse_flag;

	case oVisualHostKey:
		intptr = &options->visual_host_key;
		goto parse_flag;

	case oIPQoS:
		arg = strdelim(&s);
		if ((value = parse_ipqos(arg)) == -1)
			fatal("%s line %d: Bad IPQoS value: %s",
			    filename, linenum, arg);
		arg = strdelim(&s);
		if (arg == NULL)
			value2 = value;
		else if ((value2 = parse_ipqos(arg)) == -1)
			fatal("%s line %d: Bad IPQoS value: %s",
			    filename, linenum, arg);
		if (*activep) {
			options->ip_qos_interactive = value;
			options->ip_qos_bulk = value2;
		}
		break;

	case oUseRoaming:
		intptr = &options->use_roaming;
		goto parse_flag;

	case oRequestTTY:
		arg = strdelim(&s);
		if (!arg || *arg == '\0')
			fatal("%s line %d: missing argument.",
			    filename, linenum);
		intptr = &options->request_tty;
		if (strcasecmp(arg, "yes") == 0)
			value = REQUEST_TTY_YES;
		else if (strcasecmp(arg, "no") == 0)
			value = REQUEST_TTY_NO;
		else if (strcasecmp(arg, "force") == 0)
			value = REQUEST_TTY_FORCE;
		else if (strcasecmp(arg, "auto") == 0)
			value = REQUEST_TTY_AUTO;
		else
			fatal("Unsupported RequestTTY \"%s\"", arg);
		if (*activep && *intptr == -1)
			*intptr = value;
		break;

	case oHPNDisabled:
		intptr = &options->hpn_disabled;
		goto parse_flag;

	case oHPNBufferSize:
		intptr = &options->hpn_buffer_size;
		goto parse_int;

	case oTcpRcvBufPoll:
		intptr = &options->tcp_rcv_buf_poll;
		goto parse_flag;

	case oTcpRcvBuf:
		intptr = &options->tcp_rcv_buf;
		goto parse_int;

#ifdef	NONE_CIPHER_ENABLED
	case oNoneEnabled:
		intptr = &options->none_enabled;
		goto parse_flag;

	/*
	 * We check to see if the command comes from the command line or not.
	 * If it does then enable it otherwise fail.  NONE must never be a
	 * default configuration.
	 */
	case oNoneSwitch:
		if (strcmp(filename,"command-line") == 0) {
			intptr = &options->none_switch;
			goto parse_flag;
		} else {
			debug("NoneSwitch directive found in %.200s.",
			    filename);
			error("NoneSwitch is found in %.200s.\n"
			    "You may only use this configuration option "
			    "from the command line", filename);
			error("Continuing...");
			return 0;
		}
#endif

	case oVersionAddendum:
		if (s == NULL)
			fatal("%.200s line %d: Missing argument.", filename,
			    linenum);
		len = strspn(s, WHITESPACE);
		if (*activep && options->version_addendum == NULL) {
			if (strcasecmp(s + len, "none") == 0)
				options->version_addendum = xstrdup("");
			else if (strchr(s + len, '\r') != NULL)
				fatal("%.200s line %d: Invalid argument",
				    filename, linenum);
			else
				options->version_addendum = xstrdup(s + len);
		}
		return 0;

	case oIgnoreUnknown:
		charptr = &options->ignored_unknown;
		goto parse_string;

	case oDeprecated:
		debug("%s line %d: Deprecated option \"%s\"",
		    filename, linenum, keyword);
		return 0;

	case oUnsupported:
		error("%s line %d: Unsupported option \"%s\"",
		    filename, linenum, keyword);
		return 0;

	default:
		fatal("process_config_line: Unimplemented opcode %d", opcode);
	}

	/* Check that there is no garbage at end of line. */
	if ((arg = strdelim(&s)) != NULL && *arg != '\0') {
		fatal("%.200s line %d: garbage at end of line; \"%.200s\".",
		    filename, linenum, arg);
	}
	return 0;
}
Esempio n. 6
0
int
main(int argc, char **argv)
{
	int debug_flag = 0, log_level = SYSLOG_LEVEL_INFO;
	int opt, fopt_count = 0;
	char *tname;

	extern int optind;
	extern char *optarg;

	TAILQ_INIT(&tq);

	/* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
	sanitise_stdfd();

	if (argc <= 1)
		usage();

	while ((opt = getopt(argc, argv, "Hv46p:T:t:f:")) != -1) {
		switch (opt) {
		case 'H':
			hash_hosts = 1;
			break;
		case 'p':
			ssh_port = a2port(optarg);
			if (ssh_port <= 0) {
				fprintf(stderr, "Bad port '%s'\n", optarg);
				exit(1);
			}
			break;
		case 'T':
			timeout = convtime(optarg);
			if (timeout == -1 || timeout == 0) {
				fprintf(stderr, "Bad timeout '%s'\n", optarg);
				usage();
			}
			break;
		case 'v':
			if (!debug_flag) {
				debug_flag = 1;
				log_level = SYSLOG_LEVEL_DEBUG1;
			}
			else if (log_level < SYSLOG_LEVEL_DEBUG3)
				log_level++;
			else
				fatal("Too high debugging level.");
			break;
		case 'f':
			if (strcmp(optarg, "-") == 0)
				optarg = NULL;
			argv[fopt_count++] = optarg;
			break;
		case 't':
			get_keytypes = 0;
			tname = strtok(optarg, ",");
			while (tname) {
				int type = key_type_from_name(tname);
				switch (type) {
				case KEY_RSA1:
					get_keytypes |= KT_RSA1;
					break;
				case KEY_DSA:
					get_keytypes |= KT_DSA;
					break;
				case KEY_RSA:
					get_keytypes |= KT_RSA;
					break;
				case KEY_UNSPEC:
					fatal("unknown key type %s", tname);
				}
				tname = strtok(NULL, ",");
			}
			break;
		case '4':
			IPv4or6 = AF_INET;
			break;
		case '6':
			IPv4or6 = AF_INET6;
			break;
		case '?':
		default:
			usage();
		}
	}
	if (optind == argc && !fopt_count)
		usage();

	log_init("ssh-keyscan", log_level, SYSLOG_FACILITY_USER, 1);

	maxfd = fdlim_get(1);
	if (maxfd < 0)
		fatal("%s: fdlim_get: bad value", __progname);
	if (maxfd > MAXMAXFD)
		maxfd = MAXMAXFD;
	if (MAXCON <= 0)
		fatal("%s: not enough file descriptors", __progname);
	if (maxfd > fdlim_get(0))
		fdlim_set(maxfd);
	fdcon = xcalloc(maxfd, sizeof(con));

	read_wait_nfdset = howmany(maxfd, NFDBITS);
	read_wait = xcalloc(read_wait_nfdset, sizeof(fd_mask));

	if (fopt_count) {
		Linebuf *lb;
		char *line;
		int j;

		for (j = 0; j < fopt_count; j++) {
			lb = Linebuf_alloc(argv[j], error);
			if (!lb)
				continue;
			while ((line = Linebuf_getline(lb)) != NULL)
				do_host(line);
			Linebuf_free(lb);
		}
	}

	while (optind < argc)
		do_host(argv[optind++]);

	while (ncon > 0)
		conloop();

	return (0);
}
Esempio n. 7
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;
}
/*
 * Main program for the daemon.
 */
int
main(int ac, char **av)
{
	extern char *optarg;
	extern int optind;
	int opt, sock_in = 0, sock_out = 0, newsock, j, i, fdsetsz, on = 1;
	pid_t pid;
	socklen_t fromlen;
	fd_set *fdset;
	struct sockaddr_storage from;
	const char *remote_ip;
	int remote_port;
	FILE *f;
	struct linger linger;
	struct addrinfo *ai;
	char ntop[NI_MAXHOST], strport[NI_MAXSERV];
	int listen_sock, maxfd;
	int startup_p[2];
	int startups = 0;
	Authctxt *authctxt;
	Key *key;
	int ret, key_used = 0;

#ifdef HAVE_SECUREWARE
	(void)set_auth_parameters(ac, av);
#endif
	__progname = get_progname(av[0]);
	init_rng();

	/* Save argv. */
	saved_argc = ac;
	saved_argv = av;

	/* Initialize configuration options to their default values. */
	initialize_server_options(&options);

	/* Parse command-line arguments. */
	while ((opt = getopt(ac, av, "f:p:b:k:h:g:V:u:o:dDeiqtQ46:S")) != -1) {
		switch (opt) {
		case '4':
			IPv4or6 = AF_INET;
			break;
		case '6':
			IPv4or6 = AF_INET6;
			break;
		case 'f':
			config_file_name = optarg;
			break;
		case 'd':
			if (0 == debug_flag) {
				debug_flag = 1;
				options.log_level = SYSLOG_LEVEL_DEBUG1;
			} else if (options.log_level < SYSLOG_LEVEL_DEBUG3) {
				options.log_level++;
			} else {
				fprintf(stderr, "Too high debugging level.\n");
				exit(1);
			}
			break;
		case 'D':
			no_daemon_flag = 1;
			break;
		case 'e':
			log_stderr = 1;
			break;
		case 'i':
			inetd_flag = 1;
			break;
		case 'Q':
			/* ignored */
			break;
		case 'q':
			options.log_level = SYSLOG_LEVEL_QUIET;
			break;
		case 'b':
			options.server_key_bits = atoi(optarg);
			break;
		case 'p':
			options.ports_from_cmdline = 1;
			if (options.num_ports >= MAX_PORTS) {
				fprintf(stderr, "too many ports.\n");
				exit(1);
			}
			options.ports[options.num_ports++] = a2port(optarg);
			if (options.ports[options.num_ports-1] == 0) {
				fprintf(stderr, "Bad port number.\n");
				exit(1);
			}
			break;
		case 'g':
			if ((options.login_grace_time = convtime(optarg)) == -1) {
				fprintf(stderr, "Invalid login grace time.\n");
				exit(1);
			}
			break;
		case 'k':
			if ((options.key_regeneration_time = convtime(optarg)) == -1) {
				fprintf(stderr, "Invalid key regeneration interval.\n");
				exit(1);
			}
			break;
		case 'h':
			if (options.num_host_key_files >= MAX_HOSTKEYS) {
				fprintf(stderr, "too many host keys.\n");
				exit(1);
			}
			options.host_key_files[options.num_host_key_files++] = optarg;
			break;
		case 'V':
			client_version_string = optarg;
			/* only makes sense with inetd_flag, i.e. no listen() */
			inetd_flag = 1;
			break;
		case 't':
			test_flag = 1;
			break;
		case 'u':
			utmp_len = atoi(optarg);
			break;
		case 'o':
			if (process_server_config_line(&options, optarg,
			    "command-line", 0) != 0)
				exit(1);
			break;
		case 'S':
			protocol = IPPROTO_SCTP;
			break;
		case '?':
		default:
			usage();
			break;
		}
	}
	SSLeay_add_all_algorithms();
	channel_set_af(IPv4or6);

	/*
	 * Force logging to stderr until we have loaded the private host
	 * key (unless started from inetd)
	 */
	log_init(__progname,
	    options.log_level == SYSLOG_LEVEL_NOT_SET ?
	    SYSLOG_LEVEL_INFO : options.log_level,
	    options.log_facility == SYSLOG_FACILITY_NOT_SET ?
	    SYSLOG_FACILITY_AUTH : options.log_facility,
	    !inetd_flag);

#ifdef _CRAY
	/* Cray can define user privs drop all prives now!
	 * Not needed on PRIV_SU systems!
	 */
	drop_cray_privs();
#endif

	seed_rng();

	/* Read server configuration options from the configuration file. */
	read_server_config(&options, config_file_name);

	/* Fill in default values for those options not explicitly set. */
	fill_default_server_options(&options);

	/* Check that there are no remaining arguments. */
	if (optind < ac) {
		fprintf(stderr, "Extra argument %s.\n", av[optind]);
		exit(1);
	}

	debug("sshd version %.100s", SSH_VERSION);

	/* load private host keys */
	sensitive_data.host_keys = xmalloc(options.num_host_key_files*sizeof(Key*));
	for (i = 0; i < options.num_host_key_files; i++)
		sensitive_data.host_keys[i] = NULL;
	sensitive_data.server_key = NULL;
	sensitive_data.ssh1_host_key = NULL;
	sensitive_data.have_ssh1_key = 0;
	sensitive_data.have_ssh2_key = 0;

	for (i = 0; i < options.num_host_key_files; i++) {
		key = key_load_private(options.host_key_files[i], "", NULL);
		sensitive_data.host_keys[i] = key;
		if (key == NULL) {
			error("Could not load host key: %s",
			    options.host_key_files[i]);
			sensitive_data.host_keys[i] = NULL;
			continue;
		}
		switch (key->type) {
		case KEY_RSA1:
			sensitive_data.ssh1_host_key = key;
			sensitive_data.have_ssh1_key = 1;
			break;
		case KEY_RSA:
		case KEY_DSA:
			sensitive_data.have_ssh2_key = 1;
			break;
		}
		debug("private host key: #%d type %d %s", i, key->type,
		    key_type(key));
	}
	if ((options.protocol & SSH_PROTO_1) && !sensitive_data.have_ssh1_key) {
		log("Disabling protocol version 1. Could not load host key");
		options.protocol &= ~SSH_PROTO_1;
	}
	if ((options.protocol & SSH_PROTO_2) && !sensitive_data.have_ssh2_key) {
		log("Disabling protocol version 2. Could not load host key");
		options.protocol &= ~SSH_PROTO_2;
	}
	if (!(options.protocol & (SSH_PROTO_1|SSH_PROTO_2))) {
		log("sshd: no hostkeys available -- exiting.");
		exit(1);
	}

	/* Check certain values for sanity. */
	if (options.protocol & SSH_PROTO_1) {
		if (options.server_key_bits < 512 ||
		    options.server_key_bits > 32768) {
			fprintf(stderr, "Bad server key size.\n");
			exit(1);
		}
		/*
		 * Check that server and host key lengths differ sufficiently. This
		 * is necessary to make double encryption work with rsaref. Oh, I
		 * hate software patents. I dont know if this can go? Niels
		 */
		if (options.server_key_bits >
		    BN_num_bits(sensitive_data.ssh1_host_key->rsa->n) -
		    SSH_KEY_BITS_RESERVED && options.server_key_bits <
		    BN_num_bits(sensitive_data.ssh1_host_key->rsa->n) +
		    SSH_KEY_BITS_RESERVED) {
			options.server_key_bits =
			    BN_num_bits(sensitive_data.ssh1_host_key->rsa->n) +
			    SSH_KEY_BITS_RESERVED;
			debug("Forcing server key to %d bits to make it differ from host key.",
			    options.server_key_bits);
		}
	}

	if (use_privsep) {
		struct passwd *pw;
		struct stat st;

		if ((pw = getpwnam(SSH_PRIVSEP_USER)) == NULL)
			fatal("Privilege separation user %s does not exist",
			    SSH_PRIVSEP_USER);
		if ((stat(_PATH_PRIVSEP_CHROOT_DIR, &st) == -1) ||
		    (S_ISDIR(st.st_mode) == 0))
			fatal("Missing privilege separation directory: %s",
			    _PATH_PRIVSEP_CHROOT_DIR);
		if (st.st_uid != 0 || (st.st_mode & (S_IWGRP|S_IWOTH)) != 0)
			fatal("Bad owner or mode for %s",
			    _PATH_PRIVSEP_CHROOT_DIR);
	}

	/* Configuration looks good, so exit if in test mode. */
	if (test_flag)
		exit(0);

	/*
	 * Clear out any supplemental groups we may have inherited.  This
	 * prevents inadvertent creation of files with bad modes (in the
	 * portable version at least, it's certainly possible for PAM 
	 * to create a file, and we can't control the code in every 
	 * module which might be used).
	 */
	if (setgroups(0, NULL) < 0)
		debug("setgroups() failed: %.200s", strerror(errno));

	/* Initialize the log (it is reinitialized below in case we forked). */
	if (debug_flag && !inetd_flag)
		log_stderr = 1;
	log_init(__progname, options.log_level, options.log_facility, log_stderr);

	/*
	 * If not in debugging mode, and not started from inetd, disconnect
	 * from the controlling terminal, and fork.  The original process
	 * exits.
	 */
	if (!(debug_flag || inetd_flag || no_daemon_flag)) {
#ifdef TIOCNOTTY
		int fd;
#endif /* TIOCNOTTY */
		if (daemon(0, 0) < 0)
			fatal("daemon() failed: %.200s", strerror(errno));

		/* Disconnect from the controlling tty. */
#ifdef TIOCNOTTY
		fd = open(_PATH_TTY, O_RDWR | O_NOCTTY);
		if (fd >= 0) {
			(void) ioctl(fd, TIOCNOTTY, NULL);
			close(fd);
		}
#endif /* TIOCNOTTY */
	}
	/* Reinitialize the log (because of the fork above). */
	log_init(__progname, options.log_level, options.log_facility, log_stderr);

	/* Initialize the random number generator. */
	arc4random_stir();

	/* Chdir to the root directory so that the current disk can be
	   unmounted if desired. */
	chdir("/");

	/* ignore SIGPIPE */
	signal(SIGPIPE, SIG_IGN);

	/* Start listening for a socket, unless started from inetd. */
	if (inetd_flag) {
		int s1;
		s1 = dup(0);	/* Make sure descriptors 0, 1, and 2 are in use. */
		dup(s1);
		sock_in = dup(0);
		sock_out = dup(1);
		startup_pipe = -1;
		/*
		 * We intentionally do not close the descriptors 0, 1, and 2
		 * as our code for setting the descriptors won\'t work if
		 * ttyfd happens to be one of those.
		 */
		debug("inetd sockets after dupping: %d, %d", sock_in, sock_out);
		if (options.protocol & SSH_PROTO_1)
			generate_ephemeral_server_key();
	} else {
		for (ai = options.listen_addrs; ai; ai = ai->ai_next) {
			if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
				continue;
			if (num_listen_socks >= MAX_LISTEN_SOCKS)
				fatal("Too many listen sockets. "
				    "Enlarge MAX_LISTEN_SOCKS");
			if (getnameinfo(ai->ai_addr, ai->ai_addrlen,
			    ntop, sizeof(ntop), strport, sizeof(strport),
			    NI_NUMERICHOST|NI_NUMERICSERV) != 0) {
				error("getnameinfo failed");
				continue;
			}
			/* Create socket for listening. */
			listen_sock = socket(ai->ai_family, SOCK_STREAM, protocol);
			if (listen_sock < 0) {
				/* kernel may not support ipv6 */
				verbose("socket: %.100s", strerror(errno));
				continue;
			}
			if (fcntl(listen_sock, F_SETFL, O_NONBLOCK) < 0) {
				error("listen_sock O_NONBLOCK: %s", strerror(errno));
				close(listen_sock);
				continue;
			}
			/*
			 * Set socket options.  We try to make the port
			 * reusable and have it close as fast as possible
			 * without waiting in unnecessary wait states on
			 * close.
			 */
			setsockopt(listen_sock, SOL_SOCKET, SO_REUSEADDR,
			    &on, sizeof(on));
			linger.l_onoff = 1;
			linger.l_linger = 5;
			setsockopt(listen_sock, SOL_SOCKET, SO_LINGER,
			    &linger, sizeof(linger));

			debug("Bind to port %s on %s.", strport, ntop);

			/* Bind the socket to the desired port. */
			if (bind(listen_sock, ai->ai_addr, ai->ai_addrlen) < 0) {
				if (!ai->ai_next)
				    error("Bind to port %s on %s failed: %.200s.",
					    strport, ntop, strerror(errno));
				close(listen_sock);
				continue;
			}
			listen_socks[num_listen_socks] = listen_sock;
			num_listen_socks++;

			/* Start listening on the port. */
			log("Server listening on %s port %s.", ntop, strport);
			if (listen(listen_sock, 5) < 0)
				fatal("listen: %.100s", strerror(errno));

		}
		freeaddrinfo(options.listen_addrs);

		if (!num_listen_socks)
			fatal("Cannot bind any address.");

		if (options.protocol & SSH_PROTO_1)
			generate_ephemeral_server_key();

		/*
		 * Arrange to restart on SIGHUP.  The handler needs
		 * listen_sock.
		 */
		signal(SIGHUP, sighup_handler);

		signal(SIGTERM, sigterm_handler);
		signal(SIGQUIT, sigterm_handler);

		/* Arrange SIGCHLD to be caught. */
		signal(SIGCHLD, main_sigchld_handler);

		/* Write out the pid file after the sigterm handler is setup */
		if (!debug_flag) {
			/*
			 * Record our pid in /var/run/sshd.pid to make it
			 * easier to kill the correct sshd.  We don't want to
			 * do this before the bind above because the bind will
			 * fail if there already is a daemon, and this will
			 * overwrite any old pid in the file.
			 */
			f = fopen(options.pid_file, "wb");
			if (f) {
				fprintf(f, "%ld\n", (long) getpid());
				fclose(f);
			}
		}

		/* setup fd set for listen */
		fdset = NULL;
		maxfd = 0;
		for (i = 0; i < num_listen_socks; i++)
			if (listen_socks[i] > maxfd)
				maxfd = listen_socks[i];
		/* pipes connected to unauthenticated childs */
		startup_pipes = xmalloc(options.max_startups * sizeof(int));
		for (i = 0; i < options.max_startups; i++)
			startup_pipes[i] = -1;

		/*
		 * Stay listening for connections until the system crashes or
		 * the daemon is killed with a signal.
		 */
		for (;;) {
			if (received_sighup)
				sighup_restart();
			if (fdset != NULL)
				xfree(fdset);
			fdsetsz = howmany(maxfd+1, NFDBITS) * sizeof(fd_mask);
			fdset = (fd_set *)xmalloc(fdsetsz);
			memset(fdset, 0, fdsetsz);

			for (i = 0; i < num_listen_socks; i++)
				FD_SET(listen_socks[i], fdset);
			for (i = 0; i < options.max_startups; i++)
				if (startup_pipes[i] != -1)
					FD_SET(startup_pipes[i], fdset);

			/* Wait in select until there is a connection. */
			ret = select(maxfd+1, fdset, NULL, NULL, NULL);
			if (ret < 0 && errno != EINTR)
				error("select: %.100s", strerror(errno));
			if (received_sigterm) {
				log("Received signal %d; terminating.",
				    (int) received_sigterm);
				close_listen_socks();
				unlink(options.pid_file);
				exit(255);
			}
			if (key_used && key_do_regen) {
				generate_ephemeral_server_key();
				key_used = 0;
				key_do_regen = 0;
			}
			if (ret < 0)
				continue;

			for (i = 0; i < options.max_startups; i++)
				if (startup_pipes[i] != -1 &&
				    FD_ISSET(startup_pipes[i], fdset)) {
					/*
					 * the read end of the pipe is ready
					 * if the child has closed the pipe
					 * after successful authentication
					 * or if the child has died
					 */
					close(startup_pipes[i]);
					startup_pipes[i] = -1;
					startups--;
				}
			for (i = 0; i < num_listen_socks; i++) {
				if (!FD_ISSET(listen_socks[i], fdset))
					continue;
				fromlen = sizeof(from);
				newsock = accept(listen_socks[i], (struct sockaddr *)&from,
				    &fromlen);
				if (newsock < 0) {
					if (errno != EINTR && errno != EWOULDBLOCK)
						error("accept: %.100s", strerror(errno));
					continue;
				}
				if (fcntl(newsock, F_SETFL, 0) < 0) {
					error("newsock del O_NONBLOCK: %s", strerror(errno));
					close(newsock);
					continue;
				}
				if (drop_connection(startups) == 1) {
					debug("drop connection #%d", startups);
					close(newsock);
					continue;
				}
				if (pipe(startup_p) == -1) {
					close(newsock);
					continue;
				}

				for (j = 0; j < options.max_startups; j++)
					if (startup_pipes[j] == -1) {
						startup_pipes[j] = startup_p[0];
						if (maxfd < startup_p[0])
							maxfd = startup_p[0];
						startups++;
						break;
					}

				/*
				 * Got connection.  Fork a child to handle it, unless
				 * we are in debugging mode.
				 */
				if (debug_flag) {
					/*
					 * In debugging mode.  Close the listening
					 * socket, and start processing the
					 * connection without forking.
					 */
					debug("Server will not fork when running in debugging mode.");
					close_listen_socks();
					sock_in = newsock;
					sock_out = newsock;
					startup_pipe = -1;
					pid = getpid();
					break;
				} else {
					/*
					 * Normal production daemon.  Fork, and have
					 * the child process the connection. The
					 * parent continues listening.
					 */
					if ((pid = fork()) == 0) {
						/*
						 * Child.  Close the listening and max_startup
						 * sockets.  Start using the accepted socket.
						 * Reinitialize logging (since our pid has
						 * changed).  We break out of the loop to handle
						 * the connection.
						 */
						startup_pipe = startup_p[1];
						close_startup_pipes();
						close_listen_socks();
						sock_in = newsock;
						sock_out = newsock;
						log_init(__progname, options.log_level, options.log_facility, log_stderr);
						break;
					}
				}

				/* Parent.  Stay in the loop. */
				if (pid < 0)
					error("fork: %.100s", strerror(errno));
				else
					debug("Forked child %ld.", (long)pid);

				close(startup_p[1]);

				/* Mark that the key has been used (it was "given" to the child). */
				if ((options.protocol & SSH_PROTO_1) &&
				    key_used == 0) {
					/* Schedule server key regeneration alarm. */
					signal(SIGALRM, key_regeneration_alarm);
					alarm(options.key_regeneration_time);
					key_used = 1;
				}

				arc4random_stir();

				/* Close the new socket (the child is now taking care of it). */
				close(newsock);
			}
			/* child process check (or debug mode) */
			if (num_listen_socks < 0)
				break;
		}
	}

	/* This is the child processing a new connection. */

	/*
	 * Create a new session and process group since the 4.4BSD
	 * setlogin() affects the entire process group.  We don't
	 * want the child to be able to affect the parent.
	 */
#if 0
	/* XXX: this breaks Solaris */
	if (!debug_flag && !inetd_flag && setsid() < 0)
		error("setsid: %.100s", strerror(errno));
#endif

	/*
	 * Disable the key regeneration alarm.  We will not regenerate the
	 * key since we are no longer in a position to give it to anyone. We
	 * will not restart on SIGHUP since it no longer makes sense.
	 */
	alarm(0);
	signal(SIGALRM, SIG_DFL);
	signal(SIGHUP, SIG_DFL);
	signal(SIGTERM, SIG_DFL);
	signal(SIGQUIT, SIG_DFL);
	signal(SIGCHLD, SIG_DFL);
	signal(SIGINT, SIG_DFL);

	/*
	 * Set socket options for the connection.  We want the socket to
	 * close as fast as possible without waiting for anything.  If the
	 * connection is not a socket, these will do nothing.
	 */
	/* setsockopt(sock_in, SOL_SOCKET, SO_REUSEADDR, (void *)&on, sizeof(on)); */
	linger.l_onoff = 1;
	linger.l_linger = 5;
	setsockopt(sock_in, SOL_SOCKET, SO_LINGER, &linger, sizeof(linger));

	/* Set keepalives if requested. */
	if (options.keepalives &&
	    setsockopt(sock_in, SOL_SOCKET, SO_KEEPALIVE, &on,
	    sizeof(on)) < 0)
		error("setsockopt SO_KEEPALIVE: %.100s", strerror(errno));

	/*
	 * Register our connection.  This turns encryption off because we do
	 * not have a key.
	 */
	packet_set_connection(sock_in, sock_out);

	remote_port = get_remote_port();
	remote_ip = get_remote_ipaddr();

#ifdef LIBWRAP
	/* Check whether logins are denied from this host. */
	{
		struct request_info req;

		request_init(&req, RQ_DAEMON, __progname, RQ_FILE, sock_in, 0);
		fromhost(&req);

		if (!hosts_access(&req)) {
			debug("Connection refused by tcp wrapper");
			refuse(&req);
			/* NOTREACHED */
			fatal("libwrap refuse returns");
		}
	}
#endif /* LIBWRAP */

	/* Log the connection. */
	verbose("Connection from %.500s port %d", remote_ip, remote_port);

	/*
	 * We don\'t want to listen forever unless the other side
	 * successfully authenticates itself.  So we set up an alarm which is
	 * cleared after successful authentication.  A limit of zero
	 * indicates no limit. Note that we don\'t set the alarm in debugging
	 * mode; it is just annoying to have the server exit just when you
	 * are about to discover the bug.
	 */
	signal(SIGALRM, grace_alarm_handler);
	if (!debug_flag)
		alarm(options.login_grace_time);

	sshd_exchange_identification(sock_in, sock_out);
	/*
	 * Check that the connection comes from a privileged port.
	 * Rhosts-Authentication only makes sense from privileged
	 * programs.  Of course, if the intruder has root access on his local
	 * machine, he can connect from any port.  So do not use these
	 * authentication methods from machines that you do not trust.
	 */
	if (options.rhosts_authentication &&
	    (remote_port >= IPPORT_RESERVED ||
	    remote_port < IPPORT_RESERVED / 2)) {
		debug("Rhosts Authentication disabled, "
		    "originating port %d not trusted.", remote_port);
		options.rhosts_authentication = 0;
	}
#if defined(KRB4) && !defined(KRB5)
	if (!packet_connection_is_ipv4() &&
	    options.kerberos_authentication) {
		debug("Kerberos Authentication disabled, only available for IPv4.");
		options.kerberos_authentication = 0;
	}
#endif /* KRB4 && !KRB5 */
#ifdef AFS
	/* If machine has AFS, set process authentication group. */
	if (k_hasafs()) {
		k_setpag();
		k_unlog();
	}
#endif /* AFS */

	packet_set_nonblocking();

	if (use_privsep)
		if ((authctxt = privsep_preauth()) != NULL)
			goto authenticated;

	/* perform the key exchange */
	/* authenticate user and start session */
	if (compat20) {
		do_ssh2_kex();
		authctxt = do_authentication2();
	} else {
		do_ssh1_kex();
		authctxt = do_authentication();
	}
	/*
	 * If we use privilege separation, the unprivileged child transfers
	 * the current keystate and exits
	 */
	if (use_privsep) {
		mm_send_keystate(pmonitor);
		exit(0);
	}

 authenticated:
	/*
	 * In privilege separation, we fork another child and prepare
	 * file descriptor passing.
	 */
	if (use_privsep) {
		privsep_postauth(authctxt);
		/* the monitor process [priv] will not return */
		if (!compat20)
			destroy_sensitive_data();
	}

	/* Perform session preparation. */
	do_authenticated(authctxt);

	/* The connection has been terminated. */
	verbose("Closing connection to %.100s", remote_ip);

#ifdef USE_PAM
	finish_pam();
#endif /* USE_PAM */

	packet_close();

	if (use_privsep)
		mm_terminate();

	exit(0);
}