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#!/bin/sh
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#!/bin/sh
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# $Id: alcasar-iptables.sh 478 2011-02-07 23:17:10Z richard $
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# $Id: alcasar-iptables.sh 492 2011-02-14 06:40:53Z franck $
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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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# Rexy - 3abtux - CPN
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# Rexy - 3abtux - CPN
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# there are three channels for log : 1 (default) for tracability, 2 for secure admin (ssh), 3 for exterior access attempts,
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# there are three channels for log : 1 (default) for tracability, 2 for secure admin (ssh), 3 for exterior access attempts,
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IPTABLES="/sbin/iptables"
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IPTABLES="/sbin/iptables"
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FILTERING="no"
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FILTERING="no"
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QOS="no"
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EXTIF="eth0"
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EXTIF="eth0"
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INTIF="eth1"
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INTIF="eth1"
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TUNIF="tun0"
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TUNIF="tun0"
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PRIVATE_NETWORK_MASK="192.168.182.0/24"
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PRIVATE_NETWORK_MASK="192.168.182.0/24"
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PRIVATE_IP="192.168.182.1"
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PRIVATE_IP="192.168.182.1"
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$IPTABLES -t nat -F
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$IPTABLES -t nat -F
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$IPTABLES -t mangle -F
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$IPTABLES -t mangle -F
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$IPTABLES -F INPUT
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$IPTABLES -F INPUT
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$IPTABLES -F FORWARD
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$IPTABLES -F FORWARD
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$IPTABLES -F OUTPUT
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$IPTABLES -F OUTPUT
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$IPTABLES -N SYN-FLOOD
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# Default policies
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# Default policies
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$IPTABLES -P INPUT DROP
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$IPTABLES -P INPUT DROP
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$IPTABLES -P FORWARD DROP
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$IPTABLES -P FORWARD DROP
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$IPTABLES -P OUTPUT ACCEPT
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$IPTABLES -P OUTPUT ACCEPT
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$IPTABLES -t nat -X
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$IPTABLES -t nat -X
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# accept all on loopback
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# accept all on loopback
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$IPTABLES -A INPUT -i lo -j ACCEPT
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$IPTABLES -A INPUT -i lo -j ACCEPT
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# Block all attempts to spoof the loopback address
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$IPTABLES -A INPUT -s 127.0.0.0/8 -j DROP
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$IPTABLES -A INPUT -d 127.0.0.0/8 -j DROP
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# Block all attempts to spoof the local IP address
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$IPTABLES -A INPUT -s $PRIVATE_IP -j DROP
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# Block Syn Flood attacks
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$IPTABLES -A INPUT -p tcp -m tcp --syn -j SYN-FLOOD
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# Syn flood filtering chain
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$IPTABLES -A SYN-FLOOD -m limit --limit 1/s --limit-burst 4 -j RETURN
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$IPTABLES -A SYN-FLOOD -j DROP
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# Ensure that TCP connections start with syn packets
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$IPTABLES -A INPUT -p tcp -m tcp ! --syn -m state --state NEW -j DROP
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#############################
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#############################
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#       INTIF rules         #
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#       INTIF rules         #
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#############################
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#############################
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# accept dhcp
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# accept dhcp
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$IPTABLES -A INPUT -i $INTIF -p udp -m udp --sport bootpc --dport bootps -j ACCEPT
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$IPTABLES -A INPUT -i $INTIF -p udp -m udp --sport bootpc --dport bootps -j ACCEPT
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	$IPTABLES -A FORWARD -i $TUNIF -p tcp -j ULOG --ulog-prefix "RULE F_filter -- REJECT "
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	$IPTABLES -A FORWARD -i $TUNIF -p tcp -j ULOG --ulog-prefix "RULE F_filter -- REJECT "
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	$IPTABLES -A FORWARD -i $TUNIF -p tcp -j REJECT --reject-with tcp-reset
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	$IPTABLES -A FORWARD -i $TUNIF -p tcp -j REJECT --reject-with tcp-reset
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	$IPTABLES -A FORWARD -i $TUNIF -p udp -j REJECT --reject-with icmp-port-unreachable
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	$IPTABLES -A FORWARD -i $TUNIF -p udp -j REJECT --reject-with icmp-port-unreachable
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	$IPTABLES -A FORWARD -i $TUNIF -p icmp -j REJECT
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	$IPTABLES -A FORWARD -i $TUNIF -p icmp -j REJECT
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fi
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fi
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########################
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#  If QOS is activate  #
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########################
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if [ $QOS = "yes" ]; then
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	. /usr/local/etc/alcasar-iptables-qos.sh
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fi
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# Allow forward connections with log
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# Allow forward connections with log
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$IPTABLES -A FORWARD -i $TUNIF -m state --state NEW -j ULOG --ulog-prefix "RULE F_all -- ACCEPT "
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$IPTABLES -A FORWARD -i $TUNIF -m state --state NEW -j ULOG --ulog-prefix "RULE F_all -- ACCEPT "
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$IPTABLES -A FORWARD -i $TUNIF -m state --state NEW -j ACCEPT
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$IPTABLES -A FORWARD -i $TUNIF -m state --state NEW -j ACCEPT
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####################################################################################
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####################################################################################
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# Deny and log on INPUT from the LAN
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# Deny and log on INPUT from the LAN
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$IPTABLES -A INPUT -i $TUNIF -m state --state NEW -j ULOG --ulog-prefix "RULE rej-int -- REJECT "
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$IPTABLES -A INPUT -i $TUNIF -m state --state NEW -j ULOG --ulog-prefix "RULE rej-int -- REJECT "
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$IPTABLES -A INPUT -i $TUNIF -p tcp -j REJECT --reject-with tcp-reset
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$IPTABLES -A INPUT -i $TUNIF -p tcp -j REJECT --reject-with tcp-reset
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$IPTABLES -A INPUT -i $TUNIF -p udp -j REJECT --reject-with icmp-port-unreachable
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$IPTABLES -A INPUT -i $TUNIF -p udp -j REJECT --reject-with icmp-port-unreachable
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# On EXTIF, the access attempts are log in channel 2 (we should test --limit option to avoid deny of service)
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# On EXTIF, the access attempts are log in channel 2 (we should test --limit option to avoid deny of service)
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$IPTABLES -A INPUT -i $EXTIF -m state --state NEW -j ULOG --ulog-nlgroup 3 --ulog-qthreshold 10 --ulog-prefix "RULE rej-ext -- DROP"
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$IPTABLES -A INPUT -i $EXTIF -m state --state NEW -j ULOG --ulog-nlgroup 3 --ulog-qthreshold 10 --ulog-prefix "RULE rej-ext -- DROP"
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# Drop on EXTIF
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# Drop on EXTIF
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$IPTABLES -A INPUT -i $EXTIF -j DROP
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$IPTABLES -A INPUT -i $EXTIF -j DROP
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