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#!/bin/sh
#
# $Id: alcasar-iptables-local.sh 2740 2019-06-22 10:03:09Z rexy $
#
# Custom rules for ALCASAR firewall
#
# Examples:
#       - Local MAC addresses filtering (MAC are in '/usr/local/etc/alcasar-iptables-local-mac-filtered'. Format : aa:09:23:2f:4d:ee)
#       - allow ICMP from an Internet IP address (Admin_from) to EXTIF
#       - allow SMTP from aLCASAR to an Internet server (SMTP_IP)
#       - PAT rules from Internet
#       - Deny access to protected networks from internal LAN
#       - Allow managers to access ACC from the external network
# This script inherit of alcasar-iptables.sh variables : $INTIF, $EXTIF, $IPTABLES, etc
# !!Beware, run the script "alcasar-iptables.sh" after changing this file.

# Local MAC addresses filtering (MAC are in '/usr/local/etc/alcasar-iptables-local-mac-filtered'. Format : aa:09:23:2f:4d:ee)
if [ -s /usr/local/etc/alcasar-iptables-local-mac-filtered ]; then
        while read mac_line
        do
                ip_on=`echo $mac_line|cut -b1`
                if [ $ip_on != "#" ]
                then
                        mac_filtered=`echo $mac_line|cut -d" " -f1`
                        echo "MAC filtered = $mac_filtered"
                        $IPTABLES -A FORWARD -i $INTIF        -m mac --mac-source $mac_filtered -j NFLOG --nflog-group 1 --nflog-prefix "$mac_filtered -- Filt_DROP"
                        $IPTABLES -A FORWARD -i $INTIF -p tcp -m mac --mac-source $mac_filtered -j DROP
                        $IPTABLES -A FORWARD -i $INTIF -p udp -m mac --mac-source $mac_filtered -j DROP
                        $IPTABLES -A FORWARD -i $INTIF        -m mac --mac-source $mac_filtered -j DROP
                fi
        done < /usr/local/etc/alcasar-iptables-local-mac-filtered
fi

# On autorise le ping (echo & request) (ICMP N°0 & 8) en provenance de l'extérieur vers ALCASAR
# Allow ping (echo & request) (ICMP N°0 & 8) on EXTIF
#$IPTABLES -A INPUT  -i $EXTIF -s $Admin_from_IP -p icmp --icmp-type 8 -j ACCEPT
#$IPTABLES -A OUTPUT -o $EXTIF -d $Admin_from_IP -p icmp --icmp-type 0 -j ACCEPT

# On autorise l'accès à un serveur MAIL (SMTP) pour l'envoie de rapports, alertes (logwatch, etc.)
# Allow access to a mail server (SMTP)
#SMTP_IP='192.168.111.5'                # IP of mail server
#SMTP_PORT=587                  # port of mail server (25 for SMTP ; 587 for STARTTLS ; 465 for SMTPS)
#$IPTABLES -A OUTPUT -p tcp -d $SMTP_IP --dport $SMTP_PORT -m conntrack --ctstate NEW,ESTABLISHED -j ACCEPT
#$IPTABLES -A INPUT  -p tcp -s $SMTP_IP --sport $SMTP_PORT -m conntrack --ctstate ESTABLISHED     -j ACCEPT

# On autorise du PAT (Port Adresse Translation) afin de pouvoir joindre des équipements du LAN depuis Internet
# Allow PAT (Port Adresse Translation)
# example for the external UDP-TCP port 11222 which is redirected to the internal IP 192.168.182.10 on port 22
#$IPTABLES -A PREROUTING -i $EXTIF -t nat -p tcp -d $PUBLIC_IP --dport 11222 -j DNAT --to 192.168.182.10:22
#$IPTABLES -A PREROUTING -i $EXTIF -t nat -p udp -d $PUBLIC_IP --dport 11222 -j DNAT --to 192.168.182.10:22
#$IPTABLES -A FORWARD -p tcp -d 192.168.182.10 --dport 22 -j ACCEPT
#$IPTABLES -A FORWARD -p udp -d 192.168.182.10 --dport 22 -j ACCEPT

# Deny access to protected networks from internal LAN
#protectedNetworks='10.0.0.0/8,172.16.0.0/12,192.168.0.0/16' # (RFC 1918)
#[ -n "$TUNIF" ] && consultationIF=$TUNIF || consultationIF=$INTIF
#$IPTABLES -A FORWARD -i $consultationIF -d $protectedNetworks -j DROP
#$IPTABLES -A FORWARD -o $consultationIF -s $protectedNetworks -j DROP

# Allow managers to access ACC from the external network
#managerIPs='192.168.111.10'
#externalPort='34443'
#$IPTABLES -t mangle -A PREROUTING -i $EXTIF -s $managerIPs -p tcp -d $PUBLIC_IP --dport $externalPort -j MARK --set-mark 100
#$IPTABLES -t nat    -A PREROUTING -i $EXTIF -s $managerIPs -p tcp -d $PUBLIC_IP --dport $externalPort -j DNAT --to $PRIVATE_IP:443
#$IPTABLES           -A INPUT      -i $EXTIF -s $managerIPs -p tcp --dport 443 -m mark --mark 100 -j ACCEPT