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#!/bin/bash
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#!/bin/bash
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# $Id: alcasar-iptables-bypass.sh 1469 2014-10-30 21:58:47Z richard $
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# $Id: alcasar-iptables-bypass.sh 1523 2014-12-20 18:30:19Z franck $
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# alcasar-iptables-bypass.sh
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# alcasar-iptables-bypass.sh
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# by Rexy - 3abtux
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# by Rexy - 3abtux
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# This script is distributed under the Gnu General Public License (GPL)
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# This script is distributed under the Gnu General Public License (GPL)
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PUBLIC_IP=`echo $public_ip_mask | cut -d"/" -f1`
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PUBLIC_IP=`echo $public_ip_mask | cut -d"/" -f1`
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SSH=`grep SSH= $CONF_FILE|cut -d"=" -f2`				# sshd active (on/off)
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SSH=`grep SSH= $CONF_FILE|cut -d"=" -f2`				# sshd active (on/off)
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SSH=${SSH:=off}
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SSH=${SSH:=off}
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SSH_ADMIN_FROM=`grep SSH_ADMIN_FROM= $CONF_FILE|cut -d"=" -f2`
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SSH_ADMIN_FROM=`grep SSH_ADMIN_FROM= $CONF_FILE|cut -d"=" -f2`
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SSH_ADMIN_FROM=${SSH_ADMIN_FROM:="0.0.0.0/0.0.0.0"}				# WAN IP address to reduce ssh access (all ip allowed on LAN side)
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SSH_ADMIN_FROM=${SSH_ADMIN_FROM:="0.0.0.0/0.0.0.0"}				# WAN IP address to reduce ssh access (all ip allowed on LAN side)
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PROTOCOLS_FILTERING=`grep PROTOCOLS_FILTERING= $conf_file|cut -d"=" -f2`        # Network protocols filter (on/off)
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PROTOCOLS_FILTERING=${PROTOCOLS_FILTERING:=off}
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# On vide (flush) toutes les règles existantes
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# On vide (flush) toutes les règles existantes
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# Flush all existing rules
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# Flush all existing rules
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$IPTABLES -F
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$IPTABLES -F
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# SSHD rules if activate
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# SSHD rules if activate
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if [ $SSH = on ]
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if [ $SSH = on ]
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	then
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	then
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	$IPTABLES -A INPUT -i $INTIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport ssh -m state --state NEW -j ULOG --ulog-nlgroup 2 --ulog-prefix "RULE ssh-from-LAN -- ACCEPT"
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	$IPTABLES -A INPUT -i $INTIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport ssh -m state --state NEW -j ULOG --ulog-nlgroup 2 --ulog-prefix "RULE ssh-from-LAN -- ACCEPT"
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	$IPTABLES -A INPUT -i $INTIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport ssh -m state --state NEW -j ACCEPT
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	$IPTABLES -A INPUT -i $INTIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport ssh -m state --state NEW -j ACCEPT
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	$IPTABLES -A INPUT -i $EXTIF -s $SSH_ADMIN_FROM -d $PUBLIC_IP -p tcp --dport ssh -m state --state NEW --syn -j ULOG --ulog-nlgroup 2 --ulog-prefix "RULE ssh-from-WAN -- ACCEPT"
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	$IPTABLES -A INPUT -i $EXTIF -s $SSH_ADMIN_FROM -d $PUBLIC_IP -p tcp --dport ssh -m state --state NEW -j ULOG --ulog-nlgroup 2 --ulog-prefix "RULE ssh-from-WAN -- ACCEPT"
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	$IPTABLES -A INPUT -i $EXTIF -s $SSH_ADMIN_FROM -d $PUBLIC_IP -p tcp --dport ssh -m state --state NEW -j ACCEPT
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	$IPTABLES -A INPUT -i $EXTIF -s $SSH_ADMIN_FROM -d $PUBLIC_IP -p tcp --dport ssh -m state --state NEW -j ACCEPT
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fi
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fi
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# Insertion de règles locales
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# Insertion de règles locales
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# Here, we add local rules (i.e. VPN from Internet)
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# Here, we add local rules (i.e. VPN from Internet)
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if [ -f /usr/local/etc/alcasar-iptables-local.sh ]; then
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if [ -f /usr/local/etc/alcasar-iptables-local.sh ]; then
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        . /usr/local/etc/alcasar-iptables-local.sh
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        . /usr/local/etc/alcasar-iptables-local.sh
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fi
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fi
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#  If protocols filter is activate
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if [ $PROTOCOLS_FILTERING = on ]; then
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        echo "PROTOCOL FILTERING = On"
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        # Compute exception IP (IP addresses that shouldn't be filtered)
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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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       then
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               while read ip_exception
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               do
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                       $IPTABLES -A FORWARD -i $INTIF -s $ip_exception -m state --state NEW -j ULOG --ulog-prefix "RULE IP-exception -- ACCEPT "
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#                       $IPTABLES -A FORWARD -i $INTIF -s $ip_exception -m state --state NEW -j NETFLOW
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                       $IPTABLES -A FORWARD -i $INTIF -s $ip_exception -m state --state NEW -j ACCEPT
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               done < /usr/local/etc/alcasar-filter-exceptions
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       fi
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#       # Compute uamallowed IP (IP address of equipments connected between ALCASAR and Internet (DMZ, own servers, ...)
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#       nb_uamallowed=`wc -l /usr/local/etc/alcasar-uamallowed | cut -d" "  -f1`
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#       if [ $nb_uamallowed != "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 $INTIF -d $ip_allowed -m state --state NEW -j ULOG --ulog-prefix "RULE IP-allowed -- ACCEPT "
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##                       $IPTABLES -A FORWARD -i $INTIF -d $ip_allowed -m state --state NEW -j NETFLOW
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#                       $IPTABLES -A FORWARD -i $INTIF -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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        # Allow non comment protocols
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        while read svc_line
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        do
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                svc_on=`echo $svc_line|cut -b1`
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                if [ $svc_on != "#" ]
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                then
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                        svc_name=`echo $svc_line|cut -d" " -f1`
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                        svc_port=`echo $svc_line|cut -d" " -f2`
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                        if [ $svc_name = "icmp" ]
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                        then
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#                               $IPTABLES -A FORWARD -i $INTIF -s $PRIVATE_NETWORK_MASK -p icmp -j NETFLOW
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                                $IPTABLES -A FORWARD -i $INTIF -s $PRIVATE_NETWORK_MASK -p icmp -j ACCEPT
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                        else
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                                echo "Service = $svc_port  pour $svc_name"
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                                $IPTABLES -A FORWARD -i $INTIF -s $PRIVATE_NETWORK_MASK -p tcp --dport $svc_port -m state --state NEW -j ULOG --ulog-prefix "RULE F_TCP-$svc_name -- ACCEPT "
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#                               $IPTABLES -A FORWARD -i $INTIF -s $PRIVATE_NETWORK_MASK -p tcp --dport $svc_port -m state --state NEW -j NETFLOW
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                                $IPTABLES -A FORWARD -i $INTIF -s $PRIVATE_NETWORK_MASK -p tcp --dport $svc_port -m state --state NEW -j ACCEPT
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#                               $IPTABLES -A FORWARD -i $INTIF -s $PRIVATE_NETWORK_MASK -p udp --dport $svc_port -m state --state NEW -j ULOG --ulog-prefix "RULE F_UDP-$svc_name -- ACCEPT "
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##                              $IPTABLES -A FORWARD -i $INTIF -s $PRIVATE_NETWORK_MASK -p udp --dport $svc_port -m state --state NEW -j NETFLOW
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#                               $IPTABLES -A FORWARD -i $INTIF -s $PRIVATE_NETWORK_MASK -p udp --dport $svc_port -m state --state NEW -j ACCEPT
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                        fi
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                fi
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        done < /usr/local/etc/alcasar-services
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        # Don't forget the HTTP port
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	$IPTABLES -A FORWARD -i $INTIF -s $PRIVATE_NETWORK_MASK -p tcp --dport 80 -m state --state NEW -j ULOG --ulog-prefix "RULE F_TCP-http -- ACCEPT "
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#       $IPTABLES -A FORWARD -i $INTIF -s $PRIVATE_NETWORK_MASK -p tcp --dport 80 -m state --state NEW -j NETFLOW
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        $IPTABLES -A FORWARD -i $INTIF -s $PRIVATE_NETWORK_MASK -p tcp --dport 80 -m state --state NEW -j ACCEPT
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        # Rejet explicite des autres protocoles
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        # reject the others protocols
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        $IPTABLES -A FORWARD -i $INTIF -j ULOG --ulog-prefix "RULE F_filter -- REJECT "
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        $IPTABLES -A FORWARD -i $INTIF -p tcp -j REJECT --reject-with tcp-reset
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        $IPTABLES -A FORWARD -i $INTIF -p udp -j REJECT --reject-with icmp-port-unreachable
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        $IPTABLES -A FORWARD -i $INTIF -p icmp -j REJECT
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else
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        ## On autorise les demandes de connexions sortantes
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        echo "PROTOCOL FILTERING = Off"
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        $IPTABLES -A FORWARD -i $INTIF -m state --state NEW -j ULOG --ulog-prefix "RULE Transfert -- ACCEPT "
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        $IPTABLES -A FORWARD -i $INTIF -m state --state NEW -j ACCEPT
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fi
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# on autorise les requêtes dhcp
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# on autorise les requêtes dhcp
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# accept dhcp
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# accept dhcp
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$IPTABLES -A INPUT -i $INTIF -p udp -m udp --sport bootpc --dport bootps -j ACCEPT
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$IPTABLES -A INPUT -i $INTIF -p udp -m udp --sport bootpc --dport bootps -j ACCEPT
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# On drop le broadcast et le multicast sur les interfaces (sans Log)
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# On drop le broadcast et le multicast sur les interfaces (sans Log)
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# On laisse passer les ICMP echo-request et echo-reply en provenance du LAN
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# On laisse passer les ICMP echo-request et echo-reply en provenance du LAN
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# Allow ping (icmp N°0 & 8) from LAN
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# Allow ping (icmp N°0 & 8) from LAN
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$IPTABLES -A INPUT -i $INTIF -s $PRIVATE_NETWORK_MASK -p icmp --icmp-type 0 -j ACCEPT
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$IPTABLES -A INPUT -i $INTIF -s $PRIVATE_NETWORK_MASK -p icmp --icmp-type 0 -j ACCEPT
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$IPTABLES -A INPUT -i $INTIF -s $PRIVATE_NETWORK_MASK -p icmp --icmp-type 8 -j ACCEPT
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$IPTABLES -A INPUT -i $INTIF -s $PRIVATE_NETWORK_MASK -p icmp --icmp-type 8 -j ACCEPT
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#  On ajoute ici les règles spécifiques de filtrage réseau (accès exterieur ...)
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if [ -f /usr/local/etc/alcasar-iptables-local.sh ]; then
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        . /usr/local/etc/alcasar-iptables-local.sh
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fi
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# On autorise les retours de connexions légitimes par FORWARD
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# On autorise les retours de connexions légitimes par FORWARD
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# Conntrack on forward
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# Conntrack on forward
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$IPTABLES -A FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
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$IPTABLES -A FORWARD -p tcp -m state --state RELATED,ESTABLISHED -j ACCEPT
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# On autorise les demandes de connexions sortantes
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$IPTABLES -A FORWARD -i $INTIF -m state --state NEW -j ULOG --ulog-prefix "RULE Transfert -- ACCEPT "
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$IPTABLES -A FORWARD -i $INTIF -m state --state NEW -j ACCEPT
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$IPTABLES -A FORWARD -p udp -j DROP
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# On autorise les flux entrant ntp et dns via INTIF
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# On autorise les flux entrant ntp et dns via INTIF
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$IPTABLES -A INPUT -i $INTIF -d $PRIVATE_IP -p udp --dport domain -j ACCEPT
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$IPTABLES -A INPUT -i $INTIF -d $PRIVATE_IP -p udp --dport domain -j ACCEPT
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$IPTABLES -A INPUT -i $INTIF -d $PRIVATE_IP -p udp --dport ntp -j ACCEPT
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$IPTABLES -A INPUT -i $INTIF -d $PRIVATE_IP -p udp --dport ntp -j ACCEPT
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