[ipfire-2.x.git] / src / initscripts / system / firewall

#!/bin/sh

. /etc/sysconfig/rc
. ${rc_functions}

eval $(/usr/local/bin/readhash /var/ipfire/ppp/settings)
eval $(/usr/local/bin/readhash /var/ipfire/ethernet/settings)
eval $(/usr/local/bin/readhash /var/ipfire/optionsfw/settings)
IFACE=`/bin/cat /var/ipfire/red/iface 2> /dev/null | /usr/bin/tr -d '\012'`

if [ -f /var/ipfire/red/device ]; then
	DEVICE=`/bin/cat /var/ipfire/red/device 2> /dev/null | /usr/bin/tr -d '\012'`
fi

function iptables() {
	/sbin/iptables --wait "$@"
}

iptables_init() {
	# Flush all rules and delete all custom chains
	iptables -F
	iptables -t nat -F
	iptables -t mangle -F
	iptables -t raw -F
	iptables -X
	iptables -t nat -X
	iptables -t mangle -X
	iptables -t raw -X

	# Set up policies
	iptables -P INPUT DROP
	iptables -P FORWARD DROP
	iptables -P OUTPUT ACCEPT

	# Enable TRACE logging to syslog
	modprobe nf_log_ipv4
	sysctl -q -w net.netfilter.nf_log.2=nf_log_ipv4

	# Empty LOG_DROP and LOG_REJECT chains
	iptables -N LOG_DROP
	iptables -A LOG_DROP   -m limit --limit 10/second -j LOG
	iptables -A LOG_DROP   -j DROP
	iptables -N LOG_REJECT
	iptables -A LOG_REJECT -m limit --limit 10/second -j LOG
	iptables -A LOG_REJECT -j REJECT

	# This chain will log, then DROPs packets with certain bad combinations
	# of flags might indicate a port-scan attempt (xmas, null, etc.)
	iptables -N PSCAN
	if [ "$DROPPORTSCAN" == "on" ]; then
		iptables -A PSCAN -p tcp  -m limit --limit 10/second -j LOG --log-prefix "DROP_TCP Scan "  -m comment --comment "DROP_TCP PScan"
		iptables -A PSCAN -p udp  -m limit --limit 10/second -j LOG --log-prefix "DROP_UDP Scan "  -m comment --comment "DROP_UDP PScan"
		iptables -A PSCAN -p icmp -m limit --limit 10/second -j LOG --log-prefix "DROP_ICMP Scan " -m comment --comment "DROP_ICMP PScan"
		iptables -A PSCAN -f      -m limit --limit 10/second -j LOG --log-prefix "DROP_FRAG Scan " -m comment --comment "DROP_FRAG PScan"
	fi
	iptables -A PSCAN -j DROP -m comment --comment "DROP_PScan"

	# New tcp packets without SYN set - could well be an obscure type of port scan
	# that's not covered above, may just be a broken Windows machine
	iptables -N NEWNOTSYN
	if [ "$DROPNEWNOTSYN" == "on" ]; then
		iptables -A NEWNOTSYN  -m limit --limit 10/second -j LOG  --log-prefix "DROP_NEWNOTSYN "
	fi
	iptables -A NEWNOTSYN  -j DROP -m comment --comment "DROP_NEWNOTSYN"

	# Chain to contain all the rules relating to bad TCP flags
	iptables -N BADTCP

	# Don't check loopback
	iptables -A BADTCP -i lo -j RETURN

	# Disallow packets frequently used by port-scanners
	# NMAP FIN/URG/PSH (XMAS scan)
	iptables -A BADTCP -p tcp --tcp-flags ALL FIN,URG,PSH -j PSCAN
	# SYN/RST/ACK/FIN/URG
	iptables -A BADTCP -p tcp --tcp-flags ALL SYN,RST,ACK,FIN,URG -j PSCAN
	# ALL/ALL
	iptables -A BADTCP -p tcp --tcp-flags ALL ALL -j PSCAN
	# FIN Stealth
	iptables -A BADTCP -p tcp --tcp-flags ALL FIN -j PSCAN
	# SYN/RST (also catches xmas variants that set SYN+RST+...)
	iptables -A BADTCP -p tcp --tcp-flags SYN,RST SYN,RST -j PSCAN
	# SYN/FIN (QueSO or nmap OS probe)
	iptables -A BADTCP -p tcp --tcp-flags SYN,FIN SYN,FIN -j PSCAN
	# Null
	iptables -A BADTCP -p tcp --tcp-flags ALL NONE -j PSCAN
	# NEW TCP without SYN
	iptables -A BADTCP -p tcp ! --syn -m conntrack --ctstate NEW -j NEWNOTSYN

	iptables -A INPUT   -p tcp -j BADTCP
	iptables -A FORWARD -p tcp -j BADTCP

	# Connection tracking chains
	iptables -N CONNTRACK
	iptables -A CONNTRACK -m conntrack --ctstate ESTABLISHED -j ACCEPT
	iptables -A CONNTRACK -m conntrack --ctstate INVALID -j DROP
	iptables -A CONNTRACK -p icmp -m conntrack --ctstate RELATED -j ACCEPT
	iptables -t raw -N CONNTRACK
	iptables -t raw -A PREROUTING -j CONNTRACK

	# Conntrack helpers (https://home.regit.org/netfilter-en/secure-use-of-helpers/)

	# GRE (always enabled)
	modprobe nf_conntrack_proto_gre

	# SIP
	if [ "${CONNTRACK_SIP}" = "on" ]; then
		modprobe nf_nat_sip
		iptables -A CONNTRACK -m conntrack --ctstate RELATED \
			-m helper --helper sip -j ACCEPT
		for proto in udp tcp; do
			iptables -t raw -A CONNTRACK -p "${proto}" --dport 5060 -j CT --helper sip
		done
	fi

	# H.323
	if [ "${CONNTRACK_H323}" = "on" ]; then
		modprobe nf_nat_h323
		iptables -A CONNTRACK -m conntrack --ctstate RELATED \
			-m helper --helper h323 -j ACCEPT

		# Gatekeeper RAS
		iptables -t raw -A CONNTRACK -p udp --dport 1719 -j CT --helper RAS

		# Q.931
		iptables -t raw -A CONNTRACK -p tcp --dport 1720 -j CT --helper Q.931
	fi

	# FTP
	if [ "${CONNTRACK_FTP}" = "on" ]; then
		modprobe nf_nat_ftp
		iptables -A CONNTRACK -m conntrack --ctstate RELATED \
			-m helper --helper ftp -p tcp --dport 1024: -j ACCEPT
		iptables -t raw -A CONNTRACK -p tcp --dport 21 -j CT --helper ftp
	fi

	# PPTP
	if [ "${CONNTRACK_PPTP}" = "on" ]; then
		modprobe nf_nat_pptp
		iptables -A CONNTRACK -m conntrack --ctstate RELATED \
			-m helper --helper pptp -j ACCEPT
		iptables -t raw -A CONNTRACK -p tcp --dport 1723 -j CT --helper pptp
	fi

	# TFTP
	if [ "${CONNTRACK_TFTP}" = "on" ]; then
		modprobe nf_nat_tftp
		iptables -A CONNTRACK -m conntrack --ctstate RELATED \
			-m helper --helper tftp -j ACCEPT
		iptables -t raw -A CONNTRACK -p udp --dport 69 -j CT --helper tftp
	fi

	# IRC
	if [ "${CONNTRACK_IRC}" = "on" ]; then
		modprobe nf_nat_irc
		iptables -A CONNTRACK -m conntrack --ctstate RELATED \
			-m helper --helper irc -j ACCEPT
		iptables -t raw -A CONNTRACK -p tcp --dport 6667 -j CT --helper irc
	fi

	# Amanda
	if [ "${CONNTRACK_AMANDA}" = "on" ]; then
		modprobe nf_nat_amanda
		iptables -A CONNTRACK -m conntrack --ctstate RELATED \
			-m helper --helper amanda -j ACCEPT
		iptables -t raw -A CONNTRACK -p tcp -j CT --helper amanda
	fi

	# Fix for braindead ISPs
	iptables -A FORWARD -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu

	# CUSTOM chains, can be used by the users themselves
	iptables -N CUSTOMINPUT
	iptables -A INPUT -j CUSTOMINPUT
	iptables -N CUSTOMFORWARD
	iptables -A FORWARD -j CUSTOMFORWARD
	iptables -N CUSTOMOUTPUT
	iptables -A OUTPUT -j CUSTOMOUTPUT
	iptables -t nat -N CUSTOMPREROUTING
	iptables -t nat -A PREROUTING -j CUSTOMPREROUTING
	iptables -t nat -N CUSTOMPOSTROUTING
	iptables -t nat -A POSTROUTING -j CUSTOMPOSTROUTING

	# P2PBLOCK
	iptables -N P2PBLOCK
	iptables -A INPUT -j P2PBLOCK
	iptables -A FORWARD -j P2PBLOCK
	iptables -A OUTPUT -j P2PBLOCK
	
	# IPS (Guardian) chains
	iptables -N GUARDIAN
	iptables -A INPUT -j GUARDIAN
	iptables -A FORWARD -j GUARDIAN

	# Block non-established IPsec networks
	iptables -N IPSECBLOCK
	iptables -A FORWARD -m policy --dir out --pol none -j IPSECBLOCK
	iptables -A OUTPUT  -m policy --dir out --pol none -j IPSECBLOCK

	# Block OpenVPN transfer networks
	iptables -N OVPNBLOCK
	iptables -A INPUT   -i tun+ -j OVPNBLOCK
	iptables -A FORWARD -i tun+ -j OVPNBLOCK
	iptables -A FORWARD -o tun+ -j OVPNBLOCK

	# IPS (Suricata) chains
	iptables -N IPS_INPUT
	iptables -N IPS_FORWARD
	iptables -N IPS_OUTPUT
	iptables -A INPUT -j IPS_INPUT
	iptables -A FORWARD -j IPS_FORWARD
	iptables -A OUTPUT -j IPS_OUTPUT

	# OpenVPN transfer network translation
	iptables -t nat -N OVPNNAT
	iptables -t nat -A POSTROUTING -j OVPNNAT

	# IPTV chains for IGMPPROXY
	iptables -N IPTVINPUT
	iptables -A INPUT -j IPTVINPUT
	iptables -N IPTVFORWARD
	iptables -A FORWARD -j IPTVFORWARD

	# Allow to ping the firewall.
	iptables -N ICMPINPUT
	iptables -A INPUT -j ICMPINPUT
	iptables -A ICMPINPUT -p icmp --icmp-type 8 -j ACCEPT

	# Accept everything on loopback
	iptables -N LOOPBACK
	iptables -A LOOPBACK -i lo -j ACCEPT
	iptables -A LOOPBACK -o lo -j ACCEPT

	# Filter all packets with loopback addresses on non-loopback interfaces.
	iptables -A LOOPBACK -s 127.0.0.0/8 -j DROP
	iptables -A LOOPBACK -d 127.0.0.0/8 -j DROP

	for i in INPUT FORWARD OUTPUT; do
		iptables -A ${i} -j LOOPBACK
	done

	# Captive portal
	iptables -N CAPTIVE_PORTAL
	iptables -N CAPTIVE_PORTAL_CLIENTS
	for i in INPUT FORWARD; do
		iptables -A ${i} -j CAPTIVE_PORTAL
	done

	# Accept everything connected
	for i in INPUT FORWARD OUTPUT; do
		iptables -A ${i} -j CONNTRACK
	done

	# Allow DHCP
	iptables -N DHCPINPUT
	iptables -A DHCPINPUT -p udp --sport 68 --dport 67 -j ACCEPT
	iptables -A DHCPINPUT -p tcp --sport 68 --dport 67 -j ACCEPT

	iptables -N DHCPOUTPUT
	iptables -A DHCPOUTPUT -p udp --sport 67 --dport 68 -j ACCEPT
	iptables -A DHCPOUTPUT -p tcp --sport 67 --dport 68 -j ACCEPT

	# Allow DHCP on GREEN
	iptables -N DHCPGREENINPUT
	iptables -N DHCPGREENOUTPUT
	if [ -n "${GREEN_DEV}" ]; then
		iptables -A INPUT  -i "${GREEN_DEV}" -j DHCPGREENINPUT
		iptables -A OUTPUT -o "${GREEN_DEV}" -j DHCPGREENOUTPUT
	fi

	# Allow DHCP on BLUE to be turned on/off
	iptables -N DHCPBLUEINPUT
	iptables -N DHCPBLUEOUTPUT
	if [ -n "${BLUE_DEV}" ]; then
		iptables -A INPUT  -i "${BLUE_DEV}" -j DHCPBLUEINPUT
		iptables -A OUTPUT -o "${BLUE_DEV}" -j DHCPBLUEOUTPUT
	fi

	# GeoIP block
	iptables -N GEOIPBLOCK
	iptables -A INPUT -j GEOIPBLOCK
	iptables -A FORWARD -j GEOIPBLOCK

	# trafic from ipsecX/TUN/TAP interfaces, before "-i GREEN_DEV" accept everything
	iptables -N IPSECINPUT
	iptables -N IPSECFORWARD
	iptables -N IPSECOUTPUT
	iptables -A INPUT -j IPSECINPUT
	iptables -A FORWARD -j IPSECFORWARD
	iptables -A OUTPUT -j IPSECOUTPUT
	iptables -t nat -N IPSECNAT
	iptables -t nat -A POSTROUTING -j IPSECNAT

	# localhost and ethernet.
	# Always allow accessing the web GUI from GREEN.
	iptables -N GUIINPUT
	iptables -A INPUT -j GUIINPUT
	if [ -n "${GREEN_DEV}" ]; then
		iptables -A GUIINPUT -i "${GREEN_DEV}" -p tcp --dport 444 -j ACCEPT
	fi

	# WIRELESS chains
	iptables -N WIRELESSINPUT
	iptables -A INPUT -m conntrack --ctstate NEW -j WIRELESSINPUT
	iptables -N WIRELESSFORWARD
	iptables -A FORWARD -m conntrack --ctstate NEW -j WIRELESSFORWARD

	# OpenVPN
	iptables -N OVPNINPUT
	iptables -A INPUT -j OVPNINPUT

	# Tor (inbound and outbound)
	iptables -N TOR_INPUT
	iptables -A INPUT -j TOR_INPUT
	iptables -N TOR_OUTPUT
	iptables -A OUTPUT -j TOR_OUTPUT
	
	# Jump into the actual firewall ruleset.
	iptables -N INPUTFW
	iptables -A INPUT -j INPUTFW

	iptables -N OUTGOINGFW
	iptables -A OUTPUT -j OUTGOINGFW

	iptables -N FORWARDFW
	iptables -A FORWARD -j FORWARDFW

	# SNAT rules
	iptables -t nat -N NAT_SOURCE
	iptables -t nat -A POSTROUTING -j NAT_SOURCE

	# Captive Portal
	iptables -t nat -N CAPTIVE_PORTAL
	iptables -t nat -A PREROUTING -j CAPTIVE_PORTAL

	# Custom prerouting chains (for transparent proxy)
	iptables -t nat -N SQUID
	iptables -t nat -A PREROUTING -j SQUID

	# DNAT rules
	iptables -t nat -N NAT_DESTINATION
	iptables -t nat -A PREROUTING -j NAT_DESTINATION
	iptables -t nat -A OUTPUT -j NAT_DESTINATION

	iptables -t mangle -N NAT_DESTINATION
	iptables -t mangle -A PREROUTING -j NAT_DESTINATION

	iptables -t nat -N NAT_DESTINATION_FIX
	iptables -t nat -A POSTROUTING -j NAT_DESTINATION_FIX

	if [ -n "${GREEN_ADDRESS}" ]; then
		iptables -t nat -A NAT_DESTINATION_FIX \
			-m mark --mark 1 -j SNAT --to-source "${GREEN_ADDRESS}"
	fi

	if [ -n "${BLUE_ADDRESS}" ]; then
		iptables -t nat -A NAT_DESTINATION_FIX \
			-m mark --mark 2 -j SNAT --to-source "${BLUE_ADDRESS}"
	fi

	if [ -n "${ORANGE_ADDRESS}" ]; then
		iptables -t nat -A NAT_DESTINATION_FIX \
			-m mark --mark 3 -j SNAT --to-source "${ORANGE_ADDRESS}"
	fi

	# upnp chain for our upnp daemon
	iptables -t nat -N UPNPFW
	iptables -t nat -A PREROUTING -j UPNPFW
	iptables -N UPNPFW
	iptables -A FORWARD -m conntrack --ctstate NEW -j UPNPFW

	# RED chain, used for the red interface
	iptables -N REDINPUT
	iptables -A INPUT -j REDINPUT
	iptables -N REDFORWARD
	iptables -A FORWARD -j REDFORWARD
	iptables -t nat -N REDNAT
	iptables -t nat -A POSTROUTING -j REDNAT

	# Populate IPsec chains
	/usr/lib/firewall/ipsec-policy

	# Apply OpenVPN firewall rules
	/usr/local/bin/openvpnctrl --firewall-rules

	# run wirelessctrl
	/usr/local/bin/wirelessctrl

	# run captivectrl
	/usr/local/bin/captivectrl

	# POLICY CHAIN
	iptables -N POLICYIN
	iptables -A INPUT -j POLICYIN
	iptables -N POLICYFWD
	iptables -A FORWARD -j POLICYFWD
	iptables -N POLICYOUT
	iptables -A OUTPUT -j POLICYOUT

	# Initialize firewall policies.
	/usr/sbin/firewall-policy

	# Install firewall rules for the red interface.
	iptables_red_up

	# If red has not been brought up yet, we will
	# add the blocking rules for MASQUERADE
	if [ ! -e "/var/ipfire/red/active" ]; then
		iptables_red_down
	fi
}

iptables_red_up() {
	iptables -F REDINPUT
	iptables -F REDFORWARD
	iptables -t nat -F REDNAT

	# PPPoE / PPTP Device
	if [ "$IFACE" != "" ]; then
		# PPPoE / PPTP
		if [ "$DEVICE" != "" ]; then
			iptables -A REDINPUT -i $DEVICE -j ACCEPT
		fi
		if [ "$RED_TYPE" == "PPTP" -o "$RED_TYPE" == "PPPOE" ]; then
			if [ "$RED_DEV" != "" ]; then
				iptables -A REDINPUT -i $RED_DEV -j ACCEPT
			fi
		fi
	fi

	# PPTP over DHCP
	if [ "$DEVICE" != "" -a "$TYPE" == "PPTP" -a "$METHOD" == "DHCP" ]; then
		iptables -A REDINPUT -p tcp --source-port 67 --destination-port 68 -i $DEVICE -j ACCEPT
		iptables -A REDINPUT -p udp --source-port 67 --destination-port 68 -i $DEVICE -j ACCEPT
	fi

	if [ "$IFACE" != "" -a -f /var/ipfire/red/active ]; then
		# DHCP
		if [ "$RED_DEV" != "" -a "$RED_TYPE" == "DHCP" ]; then
			iptables -A REDINPUT -p tcp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
			iptables -A REDINPUT -p udp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
		fi
		if [ "$METHOD" == "DHCP"  -a "$PROTOCOL" == "RFC1483" ]; then
			iptables -A REDINPUT -p tcp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
			iptables -A REDINPUT -p udp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
		fi

		# Outgoing masquerading (don't masqerade IPsec (mark 50))
		iptables -t nat -A REDNAT -m mark --mark 50 -o $IFACE -j RETURN

		if [ "${IFACE}" = "${GREEN_DEV}" ]; then
			iptables -t nat -A REDNAT -i "${GREEN_DEV}" -o "${IFACE}" -j RETURN
		fi

		local NO_MASQ_NETWORKS

		if [ "${MASQUERADE_GREEN}" = "off" ]; then
			NO_MASQ_NETWORKS="${NO_MASQ_NETWORKS} ${GREEN_NETADDRESS}/${GREEN_NETMASK}"
		fi

		if [ "${MASQUERADE_BLUE}" = "off" ]; then
			NO_MASQ_NETWORKS="${NO_MASQ_NETWORKS} ${BLUE_NETADDRESS}/${BLUE_NETMASK}"
		fi

		if [ "${MASQUERADE_ORANGE}" = "off" ]; then
			NO_MASQ_NETWORKS="${NO_MASQ_NETWORKS} ${ORANGE_NETADDRESS}/${ORANGE_NETMASK}"
		fi

		local network
		for network in ${NO_MASQ_NETWORKS}; do
			iptables -t nat -A REDNAT -s "${network}" -o "${IFACE}" -j RETURN
		done

		# Masquerade everything else
		iptables -t nat -A REDNAT -o $IFACE -j MASQUERADE
	fi

	# Reload all rules.
	/usr/local/bin/firewallctrl
}

iptables_red_down() {
	# Prohibit packets to reach the masquerading rule
	# while the WAN interface is down - this is required to
	# circumvent udp related NAT issues
	# http://forum.ipfire.org/index.php?topic=11127.0
	if [ -n "${IFACE}" ]; then
		iptables -F REDFORWARD
		iptables -A REDFORWARD -o "${IFACE}" -j DROP
	fi

	# Reload all rules.
	/usr/local/bin/firewallctrl
}

# See how we were called.
case "$1" in
  start)
	boot_mesg "Setting up firewall"
	iptables_init
	evaluate_retval
	;;
  reload|up)
	boot_mesg "Reloading firewall"
	iptables_red_up
	evaluate_retval
	;;
  down)
	boot_mesg "Disabling firewall access to RED"
	iptables_red_down
	evaluate_retval
	;;
  restart)
	$0 start
	;;
  *)
        echo "Usage: $0 {start|reload|restart}"
        exit 1
	;;
esac

exit 0
Commit	Line	Data
3a1019f6 MT	1	#!/bin/sh
3a1019f6 MT	2
0f5c5ce7 MT	3	. /etc/sysconfig/rc
	4	. ${rc_functions}
	5
3a1019f6 MT	6	eval $(/usr/local/bin/readhash /var/ipfire/ppp/settings)
3a1019f6 MT	7	eval $(/usr/local/bin/readhash /var/ipfire/ethernet/settings)
fe0cd647	8	eval $(/usr/local/bin/readhash /var/ipfire/optionsfw/settings)
3a1019f6 MT	9	IFACE=`/bin/cat /var/ipfire/red/iface 2> /dev/null \| /usr/bin/tr -d '\012'`
	10
	11	if [ -f /var/ipfire/red/device ]; then
	12	DEVICE=`/bin/cat /var/ipfire/red/device 2> /dev/null \| /usr/bin/tr -d '\012'`
	13	fi
	14
c581b670 MT	15	function iptables() {
	16	/sbin/iptables --wait "$@"
	17	}
	18
3a1019f6 MT	19	iptables_init() {
3a1019f6 MT	20	# Flush all rules and delete all custom chains
c581b670 MT	21	iptables -F
	22	iptables -t nat -F
	23	iptables -t mangle -F
b1109b8a	24	iptables -t raw -F
c581b670 MT	25	iptables -X
	26	iptables -t nat -X
	27	iptables -t mangle -X
b1109b8a	28	iptables -t raw -X
3a1019f6 MT	29
3a1019f6 MT	30	# Set up policies
c581b670 MT	31	iptables -P INPUT DROP
	32	iptables -P FORWARD DROP
	33	iptables -P OUTPUT ACCEPT
3a1019f6	34
78b65ea7 MT	35	# Enable TRACE logging to syslog
	36	modprobe nf_log_ipv4
	37	sysctl -q -w net.netfilter.nf_log.2=nf_log_ipv4
	38
3a1019f6	39	# Empty LOG_DROP and LOG_REJECT chains
c581b670	40	iptables -N LOG_DROP
8ee3a135	41	iptables -A LOG_DROP -m limit --limit 10/second -j LOG
c581b670 MT	42	iptables -A LOG_DROP -j DROP
c581b670 MT	43	iptables -N LOG_REJECT
8ee3a135	44	iptables -A LOG_REJECT -m limit --limit 10/second -j LOG
c581b670	45	iptables -A LOG_REJECT -j REJECT
3a1019f6 MT	46
3a1019f6 MT	47	# This chain will log, then DROPs packets with certain bad combinations
ef7e9e52	48	# of flags might indicate a port-scan attempt (xmas, null, etc.)
c581b670	49	iptables -N PSCAN
5595bc03	50	if [ "$DROPPORTSCAN" == "on" ]; then
ef7e9e52 PM	51	iptables -A PSCAN -p tcp -m limit --limit 10/second -j LOG --log-prefix "DROP_TCP Scan " -m comment --comment "DROP_TCP PScan"
ef7e9e52 PM	52	iptables -A PSCAN -p udp -m limit --limit 10/second -j LOG --log-prefix "DROP_UDP Scan " -m comment --comment "DROP_UDP PScan"
8ee3a135 PM	53	iptables -A PSCAN -p icmp -m limit --limit 10/second -j LOG --log-prefix "DROP_ICMP Scan " -m comment --comment "DROP_ICMP PScan"
8ee3a135 PM	54	iptables -A PSCAN -f -m limit --limit 10/second -j LOG --log-prefix "DROP_FRAG Scan " -m comment --comment "DROP_FRAG PScan"
5595bc03	55	fi
c581b670	56	iptables -A PSCAN -j DROP -m comment --comment "DROP_PScan"
3a1019f6 MT	57
3a1019f6 MT	58	# New tcp packets without SYN set - could well be an obscure type of port scan
ef7e9e52	59	# that's not covered above, may just be a broken Windows machine
c581b670	60	iptables -N NEWNOTSYN
5595bc03	61	if [ "$DROPNEWNOTSYN" == "on" ]; then
8ee3a135	62	iptables -A NEWNOTSYN -m limit --limit 10/second -j LOG --log-prefix "DROP_NEWNOTSYN "
5595bc03	63	fi
c581b670	64	iptables -A NEWNOTSYN -j DROP -m comment --comment "DROP_NEWNOTSYN"
3a1019f6 MT	65
3a1019f6 MT	66	# Chain to contain all the rules relating to bad TCP flags
c581b670	67	iptables -N BADTCP
3a1019f6	68
c581b670 MT	69	# Don't check loopback
c581b670 MT	70	iptables -A BADTCP -i lo -j RETURN
d8158ca6	71
3a1019f6	72	# Disallow packets frequently used by port-scanners
dccbf1bf AF	73	# NMAP FIN/URG/PSH (XMAS scan)
	74	iptables -A BADTCP -p tcp --tcp-flags ALL FIN,URG,PSH -j PSCAN
	75	# SYN/RST/ACK/FIN/URG
	76	iptables -A BADTCP -p tcp --tcp-flags ALL SYN,RST,ACK,FIN,URG -j PSCAN
	77	# ALL/ALL
	78	iptables -A BADTCP -p tcp --tcp-flags ALL ALL -j PSCAN
	79	# FIN Stealth
c581b670	80	iptables -A BADTCP -p tcp --tcp-flags ALL FIN -j PSCAN
3a1019f6	81	# SYN/RST (also catches xmas variants that set SYN+RST+...)
c581b670	82	iptables -A BADTCP -p tcp --tcp-flags SYN,RST SYN,RST -j PSCAN
3a1019f6	83	# SYN/FIN (QueSO or nmap OS probe)
c581b670	84	iptables -A BADTCP -p tcp --tcp-flags SYN,FIN SYN,FIN -j PSCAN
dccbf1bf AF	85	# Null
dccbf1bf AF	86	iptables -A BADTCP -p tcp --tcp-flags ALL NONE -j PSCAN
3a1019f6	87	# NEW TCP without SYN
c581b670	88	iptables -A BADTCP -p tcp ! --syn -m conntrack --ctstate NEW -j NEWNOTSYN
b85d2a98	89
c581b670 MT	90	iptables -A INPUT -p tcp -j BADTCP
c581b670 MT	91	iptables -A FORWARD -p tcp -j BADTCP
c0359d6d	92
b1109b8a	93	# Connection tracking chains
c581b670	94	iptables -N CONNTRACK
b1109b8a	95	iptables -A CONNTRACK -m conntrack --ctstate ESTABLISHED -j ACCEPT
dccbf1bf	96	iptables -A CONNTRACK -m conntrack --ctstate INVALID -j DROP
0f535060	97	iptables -A CONNTRACK -p icmp -m conntrack --ctstate RELATED -j ACCEPT
b1109b8a MT	98	iptables -t raw -N CONNTRACK
	99	iptables -t raw -A PREROUTING -j CONNTRACK
	100
	101	# Conntrack helpers (https://home.regit.org/netfilter-en/secure-use-of-helpers/)
	102
a5a0c8a5 MT	103	# GRE (always enabled)
	104	modprobe nf_conntrack_proto_gre
	105
b1109b8a	106	# SIP
d57c6162	107	if [ "${CONNTRACK_SIP}" = "on" ]; then
23bb6839	108	modprobe nf_nat_sip
d57c6162 MT	109	iptables -A CONNTRACK -m conntrack --ctstate RELATED \
	110	-m helper --helper sip -j ACCEPT
	111	for proto in udp tcp; do
	112	iptables -t raw -A CONNTRACK -p "${proto}" --dport 5060 -j CT --helper sip
	113	done
	114	fi
b1109b8a	115
c8f8bf32 MT	116	# H.323
c8f8bf32 MT	117	if [ "${CONNTRACK_H323}" = "on" ]; then
23bb6839	118	modprobe nf_nat_h323
c8f8bf32 MT	119	iptables -A CONNTRACK -m conntrack --ctstate RELATED \
	120	-m helper --helper h323 -j ACCEPT
	121
	122	# Gatekeeper RAS
e2c72362	123	iptables -t raw -A CONNTRACK -p udp --dport 1719 -j CT --helper RAS
c8f8bf32 MT	124
c8f8bf32 MT	125	# Q.931
e2c72362	126	iptables -t raw -A CONNTRACK -p tcp --dport 1720 -j CT --helper Q.931
c8f8bf32 MT	127	fi
c8f8bf32 MT	128
b1109b8a	129	# FTP
d57c6162	130	if [ "${CONNTRACK_FTP}" = "on" ]; then
23bb6839	131	modprobe nf_nat_ftp
d57c6162 MT	132	iptables -A CONNTRACK -m conntrack --ctstate RELATED \
	133	-m helper --helper ftp -p tcp --dport 1024: -j ACCEPT
	134	iptables -t raw -A CONNTRACK -p tcp --dport 21 -j CT --helper ftp
	135	fi
b1109b8a MT	136
b1109b8a MT	137	# PPTP
d57c6162	138	if [ "${CONNTRACK_PPTP}" = "on" ]; then
23bb6839	139	modprobe nf_nat_pptp
d57c6162 MT	140	iptables -A CONNTRACK -m conntrack --ctstate RELATED \
d57c6162 MT	141	-m helper --helper pptp -j ACCEPT
8e7c5e65	142	iptables -t raw -A CONNTRACK -p tcp --dport 1723 -j CT --helper pptp
d57c6162	143	fi
b1109b8a MT	144
b1109b8a MT	145	# TFTP
d57c6162	146	if [ "${CONNTRACK_TFTP}" = "on" ]; then
23bb6839	147	modprobe nf_nat_tftp
d57c6162 MT	148	iptables -A CONNTRACK -m conntrack --ctstate RELATED \
	149	-m helper --helper tftp -j ACCEPT
	150	iptables -t raw -A CONNTRACK -p udp --dport 69 -j CT --helper tftp
	151	fi
3a1019f6	152
50354ffe MT	153	# IRC
50354ffe MT	154	if [ "${CONNTRACK_IRC}" = "on" ]; then
23bb6839	155	modprobe nf_nat_irc
50354ffe MT	156	iptables -A CONNTRACK -m conntrack --ctstate RELATED \
	157	-m helper --helper irc -j ACCEPT
	158	iptables -t raw -A CONNTRACK -p tcp --dport 6667 -j CT --helper irc
	159	fi
	160
a93bf696 MT	161	# Amanda
a93bf696 MT	162	if [ "${CONNTRACK_AMANDA}" = "on" ]; then
23bb6839	163	modprobe nf_nat_amanda
a93bf696 MT	164	iptables -A CONNTRACK -m conntrack --ctstate RELATED \
a93bf696 MT	165	-m helper --helper amanda -j ACCEPT
2c4b9c50	166	iptables -t raw -A CONNTRACK -p tcp -j CT --helper amanda
a93bf696	167	fi
3a1019f6	168
ef7e9e52	169	# Fix for braindead ISPs
c581b670	170	iptables -A FORWARD -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
3a1019f6 MT	171
3a1019f6 MT	172	# CUSTOM chains, can be used by the users themselves
c581b670 MT	173	iptables -N CUSTOMINPUT
	174	iptables -A INPUT -j CUSTOMINPUT
	175	iptables -N CUSTOMFORWARD
	176	iptables -A FORWARD -j CUSTOMFORWARD
	177	iptables -N CUSTOMOUTPUT
	178	iptables -A OUTPUT -j CUSTOMOUTPUT
	179	iptables -t nat -N CUSTOMPREROUTING
	180	iptables -t nat -A PREROUTING -j CUSTOMPREROUTING
	181	iptables -t nat -N CUSTOMPOSTROUTING
	182	iptables -t nat -A POSTROUTING -j CUSTOMPOSTROUTING
3a1019f6	183
2a5b19c5 AF	184	# P2PBLOCK
	185	iptables -N P2PBLOCK
	186	iptables -A INPUT -j P2PBLOCK
	187	iptables -A FORWARD -j P2PBLOCK
	188	iptables -A OUTPUT -j P2PBLOCK
	189
ef7e9e52	190	# IPS (Guardian) chains
c581b670 MT	191	iptables -N GUARDIAN
	192	iptables -A INPUT -j GUARDIAN
	193	iptables -A FORWARD -j GUARDIAN
815eaff4	194
80fbd899 MT	195	# Block non-established IPsec networks
	196	iptables -N IPSECBLOCK
	197	iptables -A FORWARD -m policy --dir out --pol none -j IPSECBLOCK
	198	iptables -A OUTPUT -m policy --dir out --pol none -j IPSECBLOCK
	199
1e555330	200	# Block OpenVPN transfer networks
c581b670	201	iptables -N OVPNBLOCK
a0a5c14f	202	iptables -A INPUT -i tun+ -j OVPNBLOCK
a0a5c14f MT	203	iptables -A FORWARD -i tun+ -j OVPNBLOCK
a0a5c14f MT	204	iptables -A FORWARD -o tun+ -j OVPNBLOCK
1e555330	205
ef7e9e52	206	# IPS (Suricata) chains
5dba8382 PM	207	iptables -N IPS_INPUT
	208	iptables -N IPS_FORWARD
	209	iptables -N IPS_OUTPUT
	210	iptables -A INPUT -j IPS_INPUT
	211	iptables -A FORWARD -j IPS_FORWARD
	212	iptables -A OUTPUT -j IPS_OUTPUT
	213
51ab1de1	214	# OpenVPN transfer network translation
c581b670 MT	215	iptables -t nat -N OVPNNAT
c581b670 MT	216	iptables -t nat -A POSTROUTING -j OVPNNAT
51ab1de1	217
daa1ceba	218	# IPTV chains for IGMPPROXY
c581b670 MT	219	iptables -N IPTVINPUT
	220	iptables -A INPUT -j IPTVINPUT
	221	iptables -N IPTVFORWARD
	222	iptables -A FORWARD -j IPTVFORWARD
daa1ceba	223
8e59a602 MT	224	# Allow to ping the firewall.
	225	iptables -N ICMPINPUT
	226	iptables -A INPUT -j ICMPINPUT
	227	iptables -A ICMPINPUT -p icmp --icmp-type 8 -j ACCEPT
3a1019f6	228
afc611d4	229	# Accept everything on loopback
c581b670 MT	230	iptables -N LOOPBACK
	231	iptables -A LOOPBACK -i lo -j ACCEPT
	232	iptables -A LOOPBACK -o lo -j ACCEPT
afc611d4	233
3b9a23ce	234	# Filter all packets with loopback addresses on non-loopback interfaces.
c581b670 MT	235	iptables -A LOOPBACK -s 127.0.0.0/8 -j DROP
c581b670 MT	236	iptables -A LOOPBACK -d 127.0.0.0/8 -j DROP
3b9a23ce MT	237
3b9a23ce MT	238	for i in INPUT FORWARD OUTPUT; do
c581b670	239	iptables -A ${i} -j LOOPBACK
3b9a23ce	240	done
afc611d4	241
bbaa3613 AM	242	# Captive portal
	243	iptables -N CAPTIVE_PORTAL
	244	iptables -N CAPTIVE_PORTAL_CLIENTS
	245	for i in INPUT FORWARD; do
	246	iptables -A ${i} -j CAPTIVE_PORTAL
	247	done
	248
3a1019f6	249	# Accept everything connected
b85d2a98	250	for i in INPUT FORWARD OUTPUT; do
c581b670	251	iptables -A ${i} -j CONNTRACK
b85d2a98 MT	252	done
b85d2a98 MT	253
8490e496 MT	254	# Allow DHCP
	255	iptables -N DHCPINPUT
	256	iptables -A DHCPINPUT -p udp --sport 68 --dport 67 -j ACCEPT
	257	iptables -A DHCPINPUT -p tcp --sport 68 --dport 67 -j ACCEPT
	258
	259	iptables -N DHCPOUTPUT
	260	iptables -A DHCPOUTPUT -p udp --sport 67 --dport 68 -j ACCEPT
	261	iptables -A DHCPOUTPUT -p tcp --sport 67 --dport 68 -j ACCEPT
	262
	263	# Allow DHCP on GREEN
	264	iptables -N DHCPGREENINPUT
	265	iptables -N DHCPGREENOUTPUT
	266	if [ -n "${GREEN_DEV}" ]; then
	267	iptables -A INPUT -i "${GREEN_DEV}" -j DHCPGREENINPUT
	268	iptables -A OUTPUT -o "${GREEN_DEV}" -j DHCPGREENOUTPUT
	269	fi
	270
ef7e9e52	271	# Allow DHCP on BLUE to be turned on/off
8490e496 MT	272	iptables -N DHCPBLUEINPUT
	273	iptables -N DHCPBLUEOUTPUT
	274	if [ -n "${BLUE_DEV}" ]; then
	275	iptables -A INPUT -i "${BLUE_DEV}" -j DHCPBLUEINPUT
	276	iptables -A OUTPUT -o "${BLUE_DEV}" -j DHCPBLUEOUTPUT
	277	fi
	278
cab02e2a SS	279	# GeoIP block
	280	iptables -N GEOIPBLOCK
	281	iptables -A INPUT -j GEOIPBLOCK
	282	iptables -A FORWARD -j GEOIPBLOCK
	283
5fd30232	284	# trafic from ipsecX/TUN/TAP interfaces, before "-i GREEN_DEV" accept everything
c581b670 MT	285	iptables -N IPSECINPUT
	286	iptables -N IPSECFORWARD
	287	iptables -N IPSECOUTPUT
	288	iptables -A INPUT -j IPSECINPUT
	289	iptables -A FORWARD -j IPSECFORWARD
	290	iptables -A OUTPUT -j IPSECOUTPUT
	291	iptables -t nat -N IPSECNAT
	292	iptables -t nat -A POSTROUTING -j IPSECNAT
b68e5c14	293
3a1019f6	294	# localhost and ethernet.
c0e0848f MT	295	# Always allow accessing the web GUI from GREEN.
	296	iptables -N GUIINPUT
	297	iptables -A INPUT -j GUIINPUT
48a7737f MT	298	if [ -n "${GREEN_DEV}" ]; then
	299	iptables -A GUIINPUT -i "${GREEN_DEV}" -p tcp --dport 444 -j ACCEPT
	300	fi
8490e496	301
81393987	302	# WIRELESS chains
c581b670 MT	303	iptables -N WIRELESSINPUT
	304	iptables -A INPUT -m conntrack --ctstate NEW -j WIRELESSINPUT
	305	iptables -N WIRELESSFORWARD
	306	iptables -A FORWARD -m conntrack --ctstate NEW -j WIRELESSFORWARD
987b75bc	307
ab4876ad	308	# OpenVPN
c581b670 MT	309	iptables -N OVPNINPUT
c581b670 MT	310	iptables -A INPUT -j OVPNINPUT
ab4876ad	311
5fc5f703	312	# Tor (inbound and outbound)
c581b670 MT	313	iptables -N TOR_INPUT
c581b670 MT	314	iptables -A INPUT -j TOR_INPUT
5fc5f703 PM	315	iptables -N TOR_OUTPUT
5fc5f703 PM	316	iptables -A OUTPUT -j TOR_OUTPUT
12dcfbbd	317
d5f1422d	318	# Jump into the actual firewall ruleset.
c581b670 MT	319	iptables -N INPUTFW
c581b670 MT	320	iptables -A INPUT -j INPUTFW
d5f1422d	321
c581b670 MT	322	iptables -N OUTGOINGFW
c581b670 MT	323	iptables -A OUTPUT -j OUTGOINGFW
d5f1422d	324
c581b670 MT	325	iptables -N FORWARDFW
c581b670 MT	326	iptables -A FORWARD -j FORWARDFW
d5f1422d	327
fac38614	328	# SNAT rules
c581b670 MT	329	iptables -t nat -N NAT_SOURCE
c581b670 MT	330	iptables -t nat -A POSTROUTING -j NAT_SOURCE
fac38614	331
9bb40553 MT	332	# Captive Portal
	333	iptables -t nat -N CAPTIVE_PORTAL
	334	iptables -t nat -A PREROUTING -j CAPTIVE_PORTAL
	335
bb12dd7b	336	# Custom prerouting chains (for transparent proxy)
c581b670 MT	337	iptables -t nat -N SQUID
c581b670 MT	338	iptables -t nat -A PREROUTING -j SQUID
bb12dd7b MT	339
bb12dd7b MT	340	# DNAT rules
c581b670 MT	341	iptables -t nat -N NAT_DESTINATION
c581b670 MT	342	iptables -t nat -A PREROUTING -j NAT_DESTINATION
99f11a16	343	iptables -t nat -A OUTPUT -j NAT_DESTINATION
bb12dd7b	344
6e87f0aa MT	345	iptables -t mangle -N NAT_DESTINATION
	346	iptables -t mangle -A PREROUTING -j NAT_DESTINATION
	347
	348	iptables -t nat -N NAT_DESTINATION_FIX
	349	iptables -t nat -A POSTROUTING -j NAT_DESTINATION_FIX
	350
48a7737f MT	351	if [ -n "${GREEN_ADDRESS}" ]; then
	352	iptables -t nat -A NAT_DESTINATION_FIX \
	353	-m mark --mark 1 -j SNAT --to-source "${GREEN_ADDRESS}"
	354	fi
6e87f0aa MT	355
	356	if [ -n "${BLUE_ADDRESS}" ]; then
	357	iptables -t nat -A NAT_DESTINATION_FIX \
	358	-m mark --mark 2 -j SNAT --to-source "${BLUE_ADDRESS}"
	359	fi
	360
	361	if [ -n "${ORANGE_ADDRESS}" ]; then
	362	iptables -t nat -A NAT_DESTINATION_FIX \
	363	-m mark --mark 3 -j SNAT --to-source "${ORANGE_ADDRESS}"
	364	fi
	365
7e7495b3	366	# upnp chain for our upnp daemon
c581b670 MT	367	iptables -t nat -N UPNPFW
	368	iptables -t nat -A PREROUTING -j UPNPFW
	369	iptables -N UPNPFW
	370	iptables -A FORWARD -m conntrack --ctstate NEW -j UPNPFW
3a1019f6	371
6e87f0aa MT	372	# RED chain, used for the red interface
	373	iptables -N REDINPUT
	374	iptables -A INPUT -j REDINPUT
	375	iptables -N REDFORWARD
	376	iptables -A FORWARD -j REDFORWARD
	377	iptables -t nat -N REDNAT
	378	iptables -t nat -A POSTROUTING -j REDNAT
	379
6c920b19 MT	380	# Populate IPsec chains
6c920b19 MT	381	/usr/lib/firewall/ipsec-policy
80fbd899	382
ab4876ad MT	383	# Apply OpenVPN firewall rules
ab4876ad MT	384	/usr/local/bin/openvpnctrl --firewall-rules
ff4770c7 AM	385
	386	# run wirelessctrl
	387	/usr/local/bin/wirelessctrl
	388
1722701a AM	389	# run captivectrl
	390	/usr/local/bin/captivectrl
	391
c581b670 MT	392	# POLICY CHAIN
	393	iptables -N POLICYIN
	394	iptables -A INPUT -j POLICYIN
	395	iptables -N POLICYFWD
	396	iptables -A FORWARD -j POLICYFWD
	397	iptables -N POLICYOUT
	398	iptables -A OUTPUT -j POLICYOUT
b324de14	399
bb383423	400	# Initialize firewall policies.
5d7faa45	401	/usr/sbin/firewall-policy
690b0bd7	402
bb383423	403	# Install firewall rules for the red interface.
4b12aa41 TE	404	iptables_red_up
	405
	406	# If red has not been brought up yet, we will
	407	# add the blocking rules for MASQUERADE
	408	if [ ! -e "/var/ipfire/red/active" ]; then
	409	iptables_red_down
	410	fi
ff4770c7	411	}
3a1019f6	412
4b12aa41	413	iptables_red_up() {
c581b670 MT	414	iptables -F REDINPUT
	415	iptables -F REDFORWARD
	416	iptables -t nat -F REDNAT
3a1019f6	417
ff4770c7 AM	418	# PPPoE / PPTP Device
	419	if [ "$IFACE" != "" ]; then
	420	# PPPoE / PPTP
	421	if [ "$DEVICE" != "" ]; then
c581b670	422	iptables -A REDINPUT -i $DEVICE -j ACCEPT
ff4770c7 AM	423	fi
	424	if [ "$RED_TYPE" == "PPTP" -o "$RED_TYPE" == "PPPOE" ]; then
	425	if [ "$RED_DEV" != "" ]; then
c581b670	426	iptables -A REDINPUT -i $RED_DEV -j ACCEPT
ff4770c7 AM	427	fi
ff4770c7 AM	428	fi
3a1019f6	429	fi
ff4770c7 AM	430
	431	# PPTP over DHCP
	432	if [ "$DEVICE" != "" -a "$TYPE" == "PPTP" -a "$METHOD" == "DHCP" ]; then
c581b670 MT	433	iptables -A REDINPUT -p tcp --source-port 67 --destination-port 68 -i $DEVICE -j ACCEPT
c581b670 MT	434	iptables -A REDINPUT -p udp --source-port 67 --destination-port 68 -i $DEVICE -j ACCEPT
3a1019f6 MT	435	fi
3a1019f6 MT	436
ff4770c7 AM	437	if [ "$IFACE" != "" -a -f /var/ipfire/red/active ]; then
	438	# DHCP
	439	if [ "$RED_DEV" != "" -a "$RED_TYPE" == "DHCP" ]; then
c581b670 MT	440	iptables -A REDINPUT -p tcp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
c581b670 MT	441	iptables -A REDINPUT -p udp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
ff4770c7 AM	442	fi
ff4770c7 AM	443	if [ "$METHOD" == "DHCP" -a "$PROTOCOL" == "RFC1483" ]; then
c581b670 MT	444	iptables -A REDINPUT -p tcp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
c581b670 MT	445	iptables -A REDINPUT -p udp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
ff4770c7 AM	446	fi
ff4770c7 AM	447
ef7e9e52	448	# Outgoing masquerading (don't masqerade IPsec (mark 50))
c581b670	449	iptables -t nat -A REDNAT -m mark --mark 50 -o $IFACE -j RETURN
c926c637	450
60fcb241 AF	451	if [ "${IFACE}" = "${GREEN_DEV}" ]; then
60fcb241 AF	452	iptables -t nat -A REDNAT -i "${GREEN_DEV}" -o "${IFACE}" -j RETURN
c926c637	453	fi
c400fe4c	454
983d471f	455	local NO_MASQ_NETWORKS
83ef9c40 MT	456
83ef9c40 MT	457	if [ "${MASQUERADE_GREEN}" = "off" ]; then
983d471f	458	NO_MASQ_NETWORKS="${NO_MASQ_NETWORKS} ${GREEN_NETADDRESS}/${GREEN_NETMASK}"
83ef9c40 MT	459	fi
	460
	461	if [ "${MASQUERADE_BLUE}" = "off" ]; then
983d471f	462	NO_MASQ_NETWORKS="${NO_MASQ_NETWORKS} ${BLUE_NETADDRESS}/${BLUE_NETMASK}"
83ef9c40 MT	463	fi
	464
	465	if [ "${MASQUERADE_ORANGE}" = "off" ]; then
983d471f	466	NO_MASQ_NETWORKS="${NO_MASQ_NETWORKS} ${ORANGE_NETADDRESS}/${ORANGE_NETMASK}"
83ef9c40 MT	467	fi
83ef9c40 MT	468
983d471f MT	469	local network
	470	for network in ${NO_MASQ_NETWORKS}; do
	471	iptables -t nat -A REDNAT -s "${network}" -o "${IFACE}" -j RETURN
83ef9c40 MT	472	done
	473
	474	# Masquerade everything else
	475	iptables -t nat -A REDNAT -o $IFACE -j MASQUERADE
6be0579b	476	fi
66f6b279 MT	477
66f6b279 MT	478	# Reload all rules.
55a5bcae	479	/usr/local/bin/firewallctrl
ff4770c7 AM	480	}
ff4770c7 AM	481
4b12aa41 TE	482	iptables_red_down() {
4b12aa41 TE	483	# Prohibit packets to reach the masquerading rule
e01e07ec	484	# while the WAN interface is down - this is required to
4b12aa41 TE	485	# circumvent udp related NAT issues
4b12aa41 TE	486	# http://forum.ipfire.org/index.php?topic=11127.0
e7204c2d MT	487	if [ -n "${IFACE}" ]; then
	488	iptables -F REDFORWARD
	489	iptables -A REDFORWARD -o "${IFACE}" -j DROP
	490	fi
4b12aa41 TE	491
	492	# Reload all rules.
	493	/usr/local/bin/firewallctrl
	494	}
	495
ff4770c7 AM	496	# See how we were called.
	497	case "$1" in
	498	start)
7d7740a4	499	boot_mesg "Setting up firewall"
ff4770c7	500	iptables_init
7d7740a4	501	evaluate_retval
6be0579b	502	;;
4b12aa41	503	reload\|up)
7d7740a4	504	boot_mesg "Reloading firewall"
4b12aa41	505	iptables_red_up
7d7740a4	506	evaluate_retval
3a1019f6	507	;;
4b12aa41 TE	508	down)
	509	boot_mesg "Disabling firewall access to RED"
	510	iptables_red_down
	511	evaluate_retval
	512	;;
3a1019f6	513	restart)
3a1019f6 MT	514	$0 start
	515	;;
	516	*)
ff4770c7	517	echo "Usage: $0 {start\|reload\|restart}"
3a1019f6 MT	518	exit 1
	519	;;
	520	esac
	521
	522	exit 0