#!/bin/sh

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

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

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

	# Empty LOG_DROP and LOG_REJECT chains
	/sbin/iptables -N LOG_DROP
	/sbin/iptables -A LOG_DROP   -m limit --limit 10/minute -j LOG
	/sbin/iptables -A LOG_DROP   -j DROP
	/sbin/iptables -N LOG_REJECT
	/sbin/iptables -A LOG_REJECT -m limit --limit 10/minute -j LOG
	/sbin/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)
	/sbin/iptables -N PSCAN
	if [ "$DROPPORTSCAN" == "on" ]; then
		/sbin/iptables -A PSCAN -p tcp  -m limit --limit 10/minute -j LOG --log-prefix "DROP_TCP Scan " -m comment --comment "DROP_TCP PScan"
		/sbin/iptables -A PSCAN -p udp  -m limit --limit 10/minute -j LOG --log-prefix "DROP_UDP Scan " -m comment --comment "DROP_UDP PScan"
		/sbin/iptables -A PSCAN -p icmp -m limit --limit 10/minute -j LOG --log-prefix "DROP_ICMP Scan " -m comment --comment "DROP_ICMP PScan"
		/sbin/iptables -A PSCAN -f      -m limit --limit 10/minute -j LOG --log-prefix "DROP_FRAG Scan " -m comment --comment "DROP_FRAG PScan"
	fi
	/sbin/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
	/sbin/iptables -N NEWNOTSYN
	if [ "$DROPNEWNOTSYN" == "on" ]; then
		/sbin/iptables -A NEWNOTSYN  -m limit --limit 10/minute -j LOG  --log-prefix "DROP_NEWNOTSYN "
	fi
	/sbin/iptables -A NEWNOTSYN  -j DROP -m comment --comment "DROP_NEWNOTSYN"

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

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

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

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

	# Connection tracking chain
	/sbin/iptables -N CONNTRACK
	/sbin/iptables -A CONNTRACK -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT

	# Fix for braindead ISP's
	/sbin/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
	/sbin/iptables -N CUSTOMINPUT
	/sbin/iptables -A INPUT -j CUSTOMINPUT
	/sbin/iptables -N CUSTOMFORWARD
	/sbin/iptables -A FORWARD -j CUSTOMFORWARD
	/sbin/iptables -N CUSTOMOUTPUT
	/sbin/iptables -A OUTPUT -j CUSTOMOUTPUT
	/sbin/iptables -t nat -N CUSTOMPREROUTING
	/sbin/iptables -t nat -A PREROUTING -j CUSTOMPREROUTING
	/sbin/iptables -t nat -N CUSTOMPOSTROUTING
	/sbin/iptables -t nat -A POSTROUTING -j CUSTOMPOSTROUTING

	# Guardian (IPS) chains
	/sbin/iptables -N GUARDIAN
	/sbin/iptables -A INPUT -j GUARDIAN
	/sbin/iptables -A FORWARD -j GUARDIAN

	# Block OpenVPN transfer networks
	/sbin/iptables -N OVPNBLOCK
	for i in INPUT FORWARD OUTPUT; do
		/sbin/iptables -A ${i} -j OVPNBLOCK
	done

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

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

	# filtering from GUI
	/sbin/iptables -N GUIINPUT
	/sbin/iptables -A INPUT -j GUIINPUT
	/sbin/iptables -A GUIINPUT -p icmp --icmp-type 8 -j ACCEPT

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

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

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

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

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

	# localhost and ethernet.
	/sbin/iptables -A INPUT   -i $GREEN_DEV  -m conntrack --ctstate NEW -j ACCEPT ! -p icmp
	
	# allow DHCP on BLUE to be turned on/off
	/sbin/iptables -N DHCPBLUEINPUT 
	/sbin/iptables -A INPUT -j DHCPBLUEINPUT
	
	# WIRELESS chains
	/sbin/iptables -N WIRELESSINPUT
	/sbin/iptables -A INPUT -m conntrack --ctstate NEW -j WIRELESSINPUT
	/sbin/iptables -N WIRELESSFORWARD
	/sbin/iptables -A FORWARD -m conntrack --ctstate NEW -j WIRELESSFORWARD

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

	# TOR
	/sbin/iptables -N TOR_INPUT
	/sbin/iptables -A INPUT -j TOR_INPUT
	
	# Jump into the actual firewall ruleset.
	/sbin/iptables -N INPUTFW
	/sbin/iptables -A INPUT -j INPUTFW

	/sbin/iptables -N OUTGOINGFW
	/sbin/iptables -A OUTPUT -j OUTGOINGFW

	/sbin/iptables -N FORWARDFW
	/sbin/iptables -A FORWARD -j FORWARDFW

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

	iptables_red

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

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

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

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

	# run local firewall configuration, if present
 	if [ -x /etc/sysconfig/firewall.local ]; then
		/etc/sysconfig/firewall.local start
	fi

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

	# run wirelessctrl
	/usr/local/bin/wirelessctrl

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

	/usr/sbin/firewall-policy

	# read new firewall
	/usr/local/bin/firewallctrl

	if [ "$DROPINPUT" == "on" ]; then
		/sbin/iptables -A INPUT   -m limit --limit 10/minute -j LOG --log-prefix "DROP_INPUT"
	fi
	/sbin/iptables -A INPUT -j DROP -m comment --comment "DROP_INPUT"
	if [ "$DROPFORWARD" == "on" ]; then
		/sbin/iptables -A FORWARD -m limit --limit 10/minute -j LOG --log-prefix "DROP_FORWARD"
	fi
	/sbin/iptables -A FORWARD -j DROP -m comment --comment "DROP_FORWARD"
}

iptables_red() {
	/sbin/iptables -F REDINPUT
	/sbin/iptables -F REDFORWARD
	/sbin/iptables -t nat -F REDNAT

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

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

	# Orange pinholes
	if [ "$ORANGE_DEV" != "" ]; then
		# This rule enables a host on ORANGE network to connect to the outside
		# (only if we have a red connection)
		if [ "$IFACE" != "" ]; then
			/sbin/iptables -A REDFORWARD -i $ORANGE_DEV -o $IFACE -j ACCEPT
		fi
	fi

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

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

	fi
}

# See how we were called.
case "$1" in
  start)
	iptables_init
	;;
  reload)
	iptables_red
	# run local firewall configuration, if present
	if [ -x /etc/sysconfig/firewall.local ]; then
		/etc/sysconfig/firewall.local reload
	fi
	;;
  restart)
	# run local firewall configuration, if present
	if [ -x /etc/sysconfig/firewall.local ]; then
		/etc/sysconfig/firewall.local stop
	fi
	$0 start
	;;
  *)
        echo "Usage: $0 {start|reload|restart}"
        exit 1
	;;
esac

exit 0