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#!/bin/sh
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#!/bin/sh
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# $Id: alcasar-iptables.sh 675 2011-07-18 21:24:19Z richard $
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# $Id: alcasar-iptables.sh 688 2011-07-28 22:20:18Z richard $
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# Script de mise en place des regles du parefeu d'Alcasar (mode normal)
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# Script de mise en place des regles du parefeu d'Alcasar (mode normal)
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# This script write the netfilter rules for ALCASAR
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# This script write the netfilter rules for ALCASAR
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# Rexy - 3abtux - CPN
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# Rexy - 3abtux - CPN
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#
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#
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# Reminders
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# Reminders
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#  If DNS filter is activate  #
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#  If DNS filter is activate  #
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###############################
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###############################
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# Redirection des flux DNS vers le port 54 (dns+blackhole) sauf pour les IP en exceptions
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# Redirection des flux DNS vers le port 54 (dns+blackhole) sauf pour les IP en exceptions
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if [ $DNS_FILTERING = on ]; then
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if [ $DNS_FILTERING = on ]; then
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	# Compute exception IP
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	# Compute exception IP
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	nb_exceptions=`wc -w /usr/local/etc/alcasar-filter-exceptions | cut -d" " -f1`
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	nb_exceptions=`wc -l /usr/local/etc/alcasar-filter-exceptions | cut -d" " -f1`
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	if [ $nb_exceptions != "0" ]
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	if [ $nb_exceptions != "0" ]
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	then
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	then
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		while read ip_exception
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		while read ip_exception
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		do
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		do
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			$IPTABLES -A PREROUTING -t nat -i $TUNIF -p udp -s $ip_exception -d $PRIVATE_IP --dport domain -j ACCEPT
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			$IPTABLES -A PREROUTING -t nat -i $TUNIF -p udp -s $ip_exception -d $PRIVATE_IP --dport domain -j ACCEPT
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		$IPTABLES -A PREROUTING -t nat -i $TUNIF -p udp -d $PRIVATE_IP --dport domain -j REDIRECT --to-port 54
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		$IPTABLES -A PREROUTING -t nat -i $TUNIF -p udp -d $PRIVATE_IP --dport domain -j REDIRECT --to-port 54
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fi
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fi
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#####################################
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#####################################
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#  If protocols filter is activate  #
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#  If protocols filter is activate  #
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#####################################
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#####################################
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# filtrage de protocoles sauf pour les IP en exceptions
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if [ $PROTOCOLS_FILTERING = on ]; then
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if [ $PROTOCOLS_FILTERING = on ]; then
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	# Compute exception IP
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	# Compute exception IP (IP addresses that shouldn't be filtered)
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	nb_exceptions=`wc -w /usr/local/etc/alcasar-filter-exceptions | cut -d" " -f1`
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	nb_exceptions=`wc -l /usr/local/etc/alcasar-filter-exceptions | cut -d" " -f1`
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	if [ $nb_exceptions != "0" ]
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	if [ $nb_exceptions != "0" ]
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	then
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	then
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		while read ip_exception
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		while read ip_exception
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		do
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		do
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			$IPTABLES -A FORWARD -i $TUNIF -s $ip_exception -m state --state NEW -j ULOG --ulog-prefix "RULE IP-exception -- ACCEPT "
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			$IPTABLES -A FORWARD -i $TUNIF -s $ip_exception -m state --state NEW -j ULOG --ulog-prefix "RULE IP-exception -- ACCEPT "
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			$IPTABLES -A FORWARD -i $TUNIF -s $ip_exception -m state --state NEW -j ACCEPT
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			$IPTABLES -A FORWARD -i $TUNIF -s $ip_exception -m state --state NEW -j ACCEPT
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		done < /usr/local/etc/alcasar-filter-exceptions
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		done < /usr/local/etc/alcasar-filter-exceptions
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	fi
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	fi
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	# Compute uamallowed IP (IP address of equipments connect between ALCASAR and Internet (DMZ, own servers, ...)
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	nb_exceptions=`wc -l /usr/local/etc/alcasar-uamallowed | cut -d" "  -f1`
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	if [ $nb_exceptions != "0" ]
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	then
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		while read ip_allowed_line
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		do
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			ip_allowed=`echo $ip_allowed_line|cut -d"\"" -f2`
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			$IPTABLES -A FORWARD -i $TUNIF -d $ip_allowed -m state --state NEW -j ULOG --ulog-prefix "RULE IP-allowed -- ACCEPT "
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			$IPTABLES -A FORWARD -i $TUNIF -d $ip_allowed -m state --state NEW -j ACCEPT
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		done < /usr/local/etc/alcasar-uamallowed
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	fi
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	# Autorisation des protocoles non commentés
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	# Autorisation des protocoles non commentés
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	# Allow non comment protocols
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	# Allow non comment protocols
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	while read svc_line
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	while read svc_line
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	do
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	do
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		svc_on=`echo $svc_line|cut -b1`
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		svc_on=`echo $svc_line|cut -b1`