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#!/bin/bash
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#!/bin/sh
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# $Id: alcasar-iptables.sh 672 2011-07-08 15:34:22Z richard $
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# $Id: alcasar-iptables.sh 675 2011-07-18 21:24:19Z richard $
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# alcasar-iptables.sh
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# by Rexy - 3abtux - CPN
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# This script is distributed under the Gnu General Public License (GPL)
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# 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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#
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# Reminders
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# There are three channels for log :
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# There are three channels for log :
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# 1 (default) for tracability;
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# 1 (default) for tracability;
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# 2 for secure admin (ssh);
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# 2 for secure admin (ssh);
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# 3 for exterior access attempts.
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# 3 for exterior access attempts.
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# The French Security Agency (ANSSI) rules was applied by 'alcasar.sh' script
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# The French Security Agency (ANSSI) rules was applied by 'alcasar.sh' script
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# The bootps/dhcp (67) port is always open on tun0/eth1 by coova
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conf_file="/usr/local/etc/alcasar.conf"
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conf_file="/usr/local/etc/alcasar.conf"
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private_ip_mask=`grep PRIVATE_IP $conf_file|cut -d"=" -f2`
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private_ip_mask=`grep PRIVATE_IP $conf_file|cut -d"=" -f2`
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private_ip_mask=${private_ip_mask:=192.168.182.1/24}
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private_ip_mask=${private_ip_mask:=192.168.182.1/24}
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private_network=`/bin/ipcalc -n $private_ip_mask|cut -d"=" -f2` # LAN IP address (ie.: 192.168.182.0)
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private_network=`/bin/ipcalc -n $private_ip_mask|cut -d"=" -f2` # LAN IP address (ie.: 192.168.182.0)
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private_prefix=`/bin/ipcalc -p $private_ip_mask|cut -d"=" -f2` # LAN prefix (ie. 24)
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private_prefix=`/bin/ipcalc -p $private_ip_mask|cut -d"=" -f2` # LAN prefix (ie. 24)
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dns1=`grep DNS1 $conf_file|cut -d"=" -f2` # first public DNS server
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dns1=`grep DNS1 $conf_file|cut -d"=" -f2` # first public DNS server
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dns1=${dns1:=208.67.220.220}
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dns1=${dns1:=208.67.220.220}
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dns2=`grep DNS2 $conf_file|cut -d"=" -f2` # second public DNS server
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dns2=`grep DNS2 $conf_file|cut -d"=" -f2` # second public DNS server
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dns2=${dns2:=208.67.222.222}
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dns2=${dns2:=208.67.222.222}
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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=`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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PROTOCOLS_FILTERING=${PROTOCOLS_FILTERING:=off}
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DNS_FILTERING=`grep DNS_FILTERING $conf_file|cut -d"=" -f2` # DNS and URLs filter (on/off)
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DNS_FILTERING=`grep DNS_FILTERING $conf_file|cut -d"=" -f2` # DNS and URLs filter (on/off)
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DNS_FILTERING=${DNS_FILTERING:=off}
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DNS_FILTERING=${DNS_FILTERING:=off}
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QOS=`grep QOS $conf_file|cut -d"=" -f2` # QOS (on/off)
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QOS=`grep QOS $conf_file|cut -d"=" -f2` # QOS (on/off)
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QOS=${QOS:=off}
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QOS=${QOS:=off}
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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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LDAP=`grep LDAP $conf_file|cut -d"=" -f2` # ldap external server active (on/off)
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LDAP=`grep LDAP $conf_file|cut -d"=" -f2` # ldap external server active (on/off)
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LDAP=${LDAP:=off}
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LDAP=${LDAP:=off}
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PRIVATE_NETWORK_MASK=$private_network/$private_prefix # Lan IP address + prefix (192.168.182.0/24)
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PRIVATE_NETWORK_MASK=$private_network/$private_prefix # Lan IP address + prefix (192.168.182.0/24)
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PRIVATE_IP=`echo $private_ip_mask | cut -d"/" -f1` # ALCASAR LAN IP address
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PRIVATE_IP=`echo $private_ip_mask | cut -d"/" -f1` # ALCASAR LAN IP address
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DNSSERVERS="$dns1,$dns2" # first and second DNS IP servers addresses
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DNSSERVERS="$dns1,$dns2" # first and second DNS IP servers addresses
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EXTIF="eth0"
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EXTIF="eth0"
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INTIF="eth1"
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INTIF="eth1"
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TUNIF="tun0" # listen card for chilli daemon
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TUNIF="tun0" # listen card for chilli daemon
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IPTABLES="/sbin/iptables"
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IPTABLES="/sbin/iptables"
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# Effacement des règles existantes
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# Effacement des règles existantes
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# Flush all existing rules
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# Flush all existing rules
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$IPTABLES -F
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$IPTABLES -F
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$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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$IPTABLES -F OUTPUT
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# Suppression des chaines utilisateurs sur les tables filter et nat
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# Suppression des chaines utilisateurs sur les tables filter et nat
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# Flush non default rules on filter and nat tables
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# Flush non default rules on filter and nat tables
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$IPTABLES -X
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$IPTABLES -X
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$IPTABLES -t nat -X
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$IPTABLES -t nat -X
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# Stratégies par défaut
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# Stratégies par défaut
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# Default policies
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# Default policies
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$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 DROP
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$IPTABLES -P OUTPUT DROP
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$IPTABLES -t nat -P PREROUTING ACCEPT
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$IPTABLES -t nat -P PREROUTING ACCEPT
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$IPTABLES -t nat -P POSTROUTING ACCEPT
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$IPTABLES -t nat -P POSTROUTING ACCEPT
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$IPTABLES -t nat -P OUTPUT ACCEPT
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$IPTABLES -t nat -P OUTPUT ACCEPT
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# Tout passe sur loopback
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# Tout passe sur loopback
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# accept all on loopback
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# accept all on loopback
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$IPTABLES -A INPUT -i lo -j ACCEPT
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$IPTABLES -A INPUT -i lo -j ACCEPT
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# On élimine les paquets "NEW not SYN"
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# Ensure that TCP connections start with syn packets
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$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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# les requètes dhcp entrantes sont acceptées
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# accept dhcp
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$IPTABLES -A INPUT -i $INTIF -p udp -m udp --sport bootpc --dport bootps -j ACCEPT
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# La règle suivante interdit la sortie par INTIF. Elle n'est utile que lorsque chilli est arrêté.
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# interdit l'accès à INTIF (n'est utile que lorsque chilli est arrêté).
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# INTIF is closed (all by TUNIF)
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# Reject INTIF access (only when chilli is down)
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$IPTABLES -A INPUT -i $INTIF -j ULOG --ulog-prefix "RULE Protect1 -- REJECT "
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$IPTABLES -A INPUT -i $INTIF -j ULOG --ulog-prefix "RULE Protect1 -- REJECT "
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$IPTABLES -A INPUT -i $INTIF -j REJECT
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$IPTABLES -A INPUT -i $INTIF -j REJECT
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#############################
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#############################
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# Local protection rules #
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# Local protection rules #
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#############################
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#############################
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# On stoppe les tentatives de NULLSCAN et XMAS (tous flags à 1)
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# On stoppe les demande de connexions non conformes (NullScan, XMAS (tous flags à 1), NEW not SYN, etc.)
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# Drop XMAS & NULLscans
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# Drop non standard connexions (NULLscans, XMAS, "NEW not SYN", etc.)
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$IPTABLES -A INPUT -p tcp --tcp-flags FIN,URG,PSH FIN,URG,PSH -j DROP
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$IPTABLES -A INPUT -p tcp --tcp-flags FIN,URG,PSH FIN,URG,PSH -j DROP
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$IPTABLES -A INPUT -p tcp --tcp-flags ALL ALL -j DROP
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$IPTABLES -A INPUT -p tcp --tcp-flags ALL ALL -j DROP
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$IPTABLES -A INPUT -p tcp --tcp-flags ALL NONE -j DROP
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$IPTABLES -A INPUT -p tcp --tcp-flags ALL NONE -j DROP
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$IPTABLES -A INPUT -p tcp --tcp-flags SYN,RST SYN,RST -j DROP
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$IPTABLES -A INPUT -p tcp --tcp-flags SYN,RST SYN,RST -j DROP
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$IPTABLES -A INPUT -p tcp -m tcp ! --syn -m state --state NEW -j DROP
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# On stoppe les broadcasts et multicast
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# On ne traite pas les broadcasts et multicast
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# Drop broadcast & multicast
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# Drop broadcast & multicast
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$IPTABLES -A INPUT -m addrtype --dst-type BROADCAST,MULTICAST -j DROP
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$IPTABLES -A INPUT -m addrtype --dst-type BROADCAST,MULTICAST -j DROP
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# Rejet des tentatives de création de tunnels DNS (même pour les utilisateurs authentifiés)
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# Rejet des tentatives de création de tunnels DNS (même pour les utilisateurs authentifiés)
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# Deny forward DNS (even for authenticated users ...)
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# Deny forward DNS (even for authenticated users ...)
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$IPTABLES -A FORWARD -i $TUNIF -p udp --dport domain -j REJECT --reject-with icmp-port-unreachable
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$IPTABLES -A FORWARD -i $TUNIF -p udp --dport domain -j REJECT --reject-with icmp-port-unreachable
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$IPTABLES -A FORWARD -i $TUNIF -p tcp --dport domain -j REJECT --reject-with tcp-reset
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$IPTABLES -A FORWARD -i $TUNIF -p tcp --dport domain -j REJECT --reject-with tcp-reset
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# On autorise les retours de connexions légitimes par FORWARD
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# On autorise les retours de connexions légitimes par FORWARD
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# Conntrack on forward
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# Conntrack on forward
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$IPTABLES -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT
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$IPTABLES -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT
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###############################
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###############################
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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 -w /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 $PRIVATE_IP --dport domain -j ACCEPT
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done < /usr/local/etc/alcasar-filter-exceptions
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done < /usr/local/etc/alcasar-filter-exceptions
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fi
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fi
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$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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# 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
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nb_exceptions=`wc -w /usr/local/etc/alcasar-filter-exceptions | cut -d" " -f1`
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nb_exceptions=`wc -w /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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# 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`
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if [ $svc_on != "#" ]
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if [ $svc_on != "#" ]
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then
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then
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svc_name=`echo $svc_line|cut -d" " -f1`
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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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svc_port=`echo $svc_line|cut -d" " -f2`
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if [ $svc_name = "icmp" ]
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if [ $svc_name = "icmp" ]
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then
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then
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$IPTABLES -A FORWARD -i $TUNIF -p icmp -j ACCEPT
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$IPTABLES -A FORWARD -i $TUNIF -p icmp -j ACCEPT
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else
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else
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$IPTABLES -A FORWARD -i $TUNIF -p tcp --dport $svc_port -m state --state NEW -j ULOG --ulog-prefix "RULE F_$svc_name -- ACCEPT "
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$IPTABLES -A FORWARD -i $TUNIF -p tcp --dport $svc_port -m state --state NEW -j ULOG --ulog-prefix "RULE F_$svc_name -- ACCEPT "
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$IPTABLES -A FORWARD -i $TUNIF -p tcp --dport $svc_port -m state --state NEW -j ACCEPT
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$IPTABLES -A FORWARD -i $TUNIF -p tcp --dport $svc_port -m state --state NEW -j ACCEPT
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fi
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fi
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fi
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fi
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done < /usr/local/etc/alcasar-services
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done < /usr/local/etc/alcasar-services
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# Rejet explicite (vers le LAN) des autres protocoles
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# Rejet explicite (vers le LAN) des autres protocoles
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# reject the others
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# reject the others
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$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
|
154 |
$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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########################
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# If QOS is activate #
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# If QOS is activate #
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########################
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########################
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if [ $QOS = on ] && [ -e /usr/local/etc/alcasar-iptables-qos.sh ]; then
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if [ $QOS = on ] && [ -e /usr/local/etc/alcasar-iptables-qos.sh ]; then
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. /usr/local/etc/alcasar-iptables-qos.sh
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. /usr/local/etc/alcasar-iptables-qos.sh
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fi
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fi
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# Autorisation des connections sortant du LAN
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# Autorisation des connections sortant du LAN
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# Allow forward connections with log
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# Allow forward connections with log
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$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 $TUNIF -m state --state NEW -j ACCEPT
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#################################################################################################
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#################################################################################################
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# Direct input from local network (icmp, dns, ntp, https, http, ssh and 3990 (user disconnect) #
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# Direct input from local network (icmp, dns, ntp, https, http, ssh and 3990 (user disconnect) #
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#################################################################################################
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#################################################################################################
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$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -p icmp --icmp-type 0 -j ACCEPT # ping reply
|
173 |
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -p icmp --icmp-type 0 -j ACCEPT # ping reply
|
182 |
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -p icmp --icmp-type 8 -j ACCEPT # ping request
|
174 |
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -p icmp --icmp-type 8 -j ACCEPT # ping request
|
183 |
$IPTABLES -A INPUT -i $TUNIF -d $PRIVATE_IP -p udp --dport domain -j ACCEPT # dnsmasq without forward
|
175 |
$IPTABLES -A INPUT -i $TUNIF -d $PRIVATE_IP -p udp --dport domain -j ACCEPT # dnsmasq without forward
|
184 |
$IPTABLES -A INPUT -i $TUNIF -d $PRIVATE_IP -p udp --dport 54 -j ACCEPT # dnsmasq with blackhole
|
176 |
$IPTABLES -A INPUT -i $TUNIF -d $PRIVATE_IP -p udp --dport 54 -j ACCEPT # dnsmasq with blackhole
|
185 |
$IPTABLES -A INPUT -i $TUNIF -d $PRIVATE_IP -p udp --dport ntp -j ACCEPT
|
177 |
$IPTABLES -A INPUT -i $TUNIF -d $PRIVATE_IP -p udp --dport ntp -j ACCEPT
|
186 |
$IPTABLES -A INPUT -i $TUNIF -d $PRIVATE_IP -p tcp --dport https -j ACCEPT
|
178 |
$IPTABLES -A INPUT -i $TUNIF -d $PRIVATE_IP -p tcp --dport https -j ACCEPT
|
187 |
$IPTABLES -A INPUT -i $TUNIF -d $PRIVATE_IP -p tcp --dport http -j ACCEPT
|
179 |
$IPTABLES -A INPUT -i $TUNIF -d $PRIVATE_IP -p tcp --dport http -j ACCEPT
|
188 |
$IPTABLES -A INPUT -i $TUNIF -d $PRIVATE_IP -p tcp --dport 3990 -j ACCEPT
|
180 |
$IPTABLES -A INPUT -i $TUNIF -d $PRIVATE_IP -p tcp --dport 3990 -j ACCEPT
|
189 |
# SSHD rules if activate
|
181 |
# SSHD rules if activate
|
190 |
if [ $SSH = on ]
|
182 |
if [ $SSH = on ]
|
191 |
then
|
183 |
then
|
192 |
Admin_from_IP="0.0.0.0/0.0.0.0" # Une @IP fixe peut-être fournie pour restreindre l'accès en ssh depuis l'extérieur (ex: 80.22.21.53/24) ( 0.0.0.0/0.0.0.0 = de n'importe où ! )
|
184 |
Admin_from_IP="0.0.0.0/0.0.0.0" # Une @IP fixe peut-être fournie pour restreindre l'accès en ssh depuis l'extérieur (ex: 80.22.21.53/24) ( 0.0.0.0/0.0.0.0 = de n'importe où ! )
|
193 |
$IPTABLES -A INPUT -i $TUNIF -d $PRIVATE_IP -p tcp --dport ssh -m state --state NEW -j ULOG --ulog-nlgroup 2 --ulog-prefix "RULE ssh-from-LAN -- ACCEPT"
|
185 |
$IPTABLES -A INPUT -i $TUNIF -d $PRIVATE_IP -p tcp --dport ssh -m state --state NEW -j ULOG --ulog-nlgroup 2 --ulog-prefix "RULE ssh-from-LAN -- ACCEPT"
|
194 |
$IPTABLES -A INPUT -i $TUNIF -d $PRIVATE_IP -p tcp --dport ssh -j ACCEPT
|
186 |
$IPTABLES -A INPUT -i $TUNIF -d $PRIVATE_IP -p tcp --dport ssh -j ACCEPT
|
195 |
$IPTABLES -A INPUT -i $EXTIF -p tcp --dport ssh -s $Admin_from_IP -m state --state NEW --syn -j ULOG --ulog-nlgroup 2 --ulog-prefix "RULE ssh-from-WAN -- ACCEPT"
|
187 |
$IPTABLES -A INPUT -i $EXTIF -p tcp --dport ssh -s $Admin_from_IP -m state --state NEW --syn -j ULOG --ulog-nlgroup 2 --ulog-prefix "RULE ssh-from-WAN -- ACCEPT"
|
196 |
$IPTABLES -A INPUT -i $EXTIF -p tcp --dport ssh -s $Admin_from_IP -m state --state NEW,ESTABLISHED -j ACCEPT
|
188 |
$IPTABLES -A INPUT -i $EXTIF -p tcp --dport ssh -s $Admin_from_IP -m state --state NEW,ESTABLISHED -j ACCEPT
|
197 |
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --sport ssh -m state --state ESTABLISHED -j ACCEPT
|
189 |
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --sport ssh -m state --state ESTABLISHED -j ACCEPT
|
198 |
fi
|
190 |
fi
|
199 |
|
191 |
|
200 |
# Insertion de règles locales
|
192 |
# Insertion de règles locales
|
201 |
# Here, we add local rules (i.e. ssh from Internet)
|
193 |
# Here, we add local rules (i.e. ssh from Internet)
|
202 |
if [ -f /usr/local/etc/alcasar-iptables-local.sh ]; then
|
194 |
if [ -f /usr/local/etc/alcasar-iptables-local.sh ]; then
|
203 |
. /usr/local/etc/alcasar-iptables-local.sh
|
195 |
. /usr/local/etc/alcasar-iptables-local.sh
|
204 |
fi
|
196 |
fi
|
205 |
|
197 |
|
206 |
# On autorise les retours de connexions légitimes par INPUT
|
198 |
# On autorise les retours de connexions légitimes par INPUT
|
207 |
# Conntrack on INPUT
|
199 |
# Conntrack on INPUT
|
208 |
$IPTABLES -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
|
200 |
$IPTABLES -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
|
209 |
|
201 |
|
210 |
# On interdit les connexions directes au port utilisé par DansGuardian (8080)
|
202 |
# On interdit les connexions directes au port utilisé par DansGuardian (8080)
|
211 |
# Les packets concernés ont fait l'objet d'un marquage dans la table mangle
|
203 |
# Les packets concernés ont fait l'objet d'un marquage dans la table mangle
|
212 |
# lors d'une règle de PREROUTING (voir plus bas)
|
204 |
# lors d'une règle de PREROUTING (voir plus bas)
|
213 |
# Deny direct connections on DansGuardian port (8080)
|
205 |
# Deny direct connections on DansGuardian port (8080)
|
214 |
# The concerned paquets are marked by a pre-routing rule (see further)
|
206 |
# The concerned paquets are marked by a pre-routing rule (see further)
|
215 |
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 8080 -m mark --mark 1 -j DROP
|
207 |
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 8080 -m mark --mark 1 -j DROP
|
216 |
# Autorisation des connexions à DansGuardian
|
208 |
# Autorisation des connexions à DansGuardian
|
217 |
# Allow connections for DansGuardian
|
209 |
# Allow connections for DansGuardian
|
218 |
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 8080 -m state --state NEW --syn -j ACCEPT
|
210 |
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 8080 -m state --state NEW --syn -j ACCEPT
|
219 |
|
211 |
|
220 |
# Journalisation des requètes HTTP (seulement des paquets SYN)
|
212 |
# Journalisation des requètes HTTP (seulement des paquets SYN)
|
221 |
# Log HTTP requests (only syn)
|
213 |
# Log HTTP requests (only syn)
|
222 |
$IPTABLES -A PREROUTING -t nat -i $TUNIF -p tcp ! -d $PRIVATE_IP --dport http -m state --state NEW -j ULOG --ulog-prefix "RULE F_http -- ACCEPT "
|
214 |
$IPTABLES -A PREROUTING -t nat -i $TUNIF -p tcp ! -d $PRIVATE_IP --dport http -m state --state NEW -j ULOG --ulog-prefix "RULE F_http -- ACCEPT "
|
223 |
# On redirige les requêtes HTTP vers DansGuardian (transparent pour les utilisateurs)
|
215 |
# On redirige les requêtes HTTP vers DansGuardian (transparent pour les utilisateurs)
|
224 |
# Redirect HTTP request in DansGuardian (transparent proxy)
|
216 |
# Redirect HTTP request in DansGuardian (transparent proxy)
|
225 |
$IPTABLES -A PREROUTING -t nat -i $TUNIF -p tcp ! -d $PRIVATE_IP --dport http -j REDIRECT --to-port 8080
|
217 |
$IPTABLES -A PREROUTING -t nat -i $TUNIF -p tcp ! -d $PRIVATE_IP --dport http -j REDIRECT --to-port 8080
|
226 |
# Journalisation et marquage des paquets qui tentent d'accéder directement à DansGuardian
|
218 |
# Journalisation et marquage des paquets qui tentent d'accéder directement à DansGuardian
|
227 |
# pour pouvoir les supprimer en INPUT (voir plus haut)
|
219 |
# pour pouvoir les supprimer en INPUT (voir plus haut)
|
228 |
# Mark the dansguardian bypass attempts
|
220 |
# Mark the dansguardian bypass attempts
|
229 |
$IPTABLES -A PREROUTING -t nat -i $TUNIF -p tcp -d $PRIVATE_IP -m tcp --dport 8080 -j ULOG --ulog-prefix "RULE direct-proxy -- DENY "
|
221 |
$IPTABLES -A PREROUTING -t nat -i $TUNIF -p tcp -d $PRIVATE_IP -m tcp --dport 8080 -j ULOG --ulog-prefix "RULE direct-proxy -- DENY "
|
230 |
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -p tcp -d $PRIVATE_IP -m tcp --dport 8080 -j MARK --set-mark 1
|
222 |
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -p tcp -d $PRIVATE_IP -m tcp --dport 8080 -j MARK --set-mark 1
|
231 |
|
223 |
|
232 |
# Journalisation et rejet des connexions (autres que celles autorisées) effectuées depuis le LAN
|
224 |
# Journalisation et rejet des connexions (autres que celles autorisées) effectuées depuis le LAN
|
233 |
# Deny and log on INPUT from the LAN
|
225 |
# Deny and log on INPUT from the LAN
|
234 |
$IPTABLES -A INPUT -i $TUNIF -m state --state NEW -j ULOG --ulog-prefix "RULE rej-int -- REJECT "
|
226 |
$IPTABLES -A INPUT -i $TUNIF -m state --state NEW -j ULOG --ulog-prefix "RULE rej-int -- REJECT "
|
235 |
$IPTABLES -A INPUT -i $TUNIF -p tcp -j REJECT --reject-with tcp-reset
|
227 |
$IPTABLES -A INPUT -i $TUNIF -p tcp -j REJECT --reject-with tcp-reset
|
236 |
$IPTABLES -A INPUT -i $TUNIF -p udp -j REJECT --reject-with icmp-port-unreachable
|
228 |
$IPTABLES -A INPUT -i $TUNIF -p udp -j REJECT --reject-with icmp-port-unreachable
|
237 |
|
229 |
|
238 |
# Journalisation et rejet des connexions initiées depuis le réseau extérieur (test des effets du paramètre --limit en cours)
|
230 |
# Journalisation et rejet des connexions initiées depuis le réseau extérieur (test des effets du paramètre --limit en cours)
|
239 |
# On EXTIF, the access attempts are log in channel 2 (we should test --limit option to avoid deny of service)
|
231 |
# On EXTIF, the access attempts are log in channel 2 (we should test --limit option to avoid deny of service)
|
240 |
$IPTABLES -A INPUT -i $EXTIF -m state --state NEW -j ULOG --ulog-nlgroup 3 --ulog-qthreshold 10 --ulog-prefix "RULE rej-ext -- DROP"
|
232 |
$IPTABLES -A INPUT -i $EXTIF -m state --state NEW -j ULOG --ulog-nlgroup 3 --ulog-qthreshold 10 --ulog-prefix "RULE rej-ext -- DROP"
|
241 |
|
233 |
|
242 |
#############################
|
234 |
#############################
|
243 |
# filtering outside OUTPUT. #
|
235 |
# filtering outside OUTPUT. #
|
244 |
#############################
|
236 |
#############################
|
245 |
# On laisse tout sortir sur toutes les cartes sauf celle qui est connectée sur l'extérieur
|
237 |
# On laisse tout sortir sur toutes les cartes sauf celle qui est connectée sur l'extérieur
|
246 |
# Everything is allowed but traffic through outside network interface
|
238 |
# Everything is allowed but traffic through outside network interface
|
247 |
$IPTABLES -A OUTPUT ! -o $EXTIF -j ACCEPT
|
239 |
$IPTABLES -A OUTPUT ! -o $EXTIF -j ACCEPT
|
248 |
|
240 |
|
249 |
# On autorise les requêtes DNS vers les serveurs DNS identifiés
|
241 |
# On autorise les requêtes DNS vers les serveurs DNS identifiés
|
250 |
# Allow DNS requests to identified DNS servers
|
242 |
# Allow DNS requests to identified DNS servers
|
251 |
$IPTABLES -A OUTPUT -o $EXTIF -d $DNSSERVERS -p udp --dport domain -m state --state NEW -j ACCEPT
|
243 |
$IPTABLES -A OUTPUT -o $EXTIF -d $DNSSERVERS -p udp --dport domain -m state --state NEW -j ACCEPT
|
252 |
# On autorise les requêtes HTTP sortantes
|
244 |
# On autorise les requêtes HTTP sortantes
|
253 |
# HTTP requests are allowed
|
245 |
# HTTP requests are allowed
|
254 |
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport http -j ACCEPT
|
246 |
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport http -j ACCEPT
|
255 |
# On autorise les requêtes NTP
|
247 |
# On autorise les requêtes NTP
|
256 |
# NTP requests are allowed
|
248 |
# NTP requests are allowed
|
257 |
$IPTABLES -A OUTPUT -o $EXTIF -p udp --dport ntp -j ACCEPT
|
249 |
$IPTABLES -A OUTPUT -o $EXTIF -p udp --dport ntp -j ACCEPT
|
258 |
# On autorise les requêtes ICMP (ping)
|
250 |
# On autorise les requêtes ICMP (ping)
|
259 |
# ICMP (ping) requests are allowed
|
251 |
# ICMP (ping) requests are allowed
|
260 |
$IPTABLES -A OUTPUT -o $EXTIF -p icmp --icmp-type 8 -j ACCEPT
|
252 |
$IPTABLES -A OUTPUT -o $EXTIF -p icmp --icmp-type 8 -j ACCEPT
|
261 |
# On autorise les requêtes LDAP si un serveur externe est configué
|
253 |
# On autorise les requêtes LDAP si un serveur externe est configué
|
262 |
# LDAP requests are allowed if an external server is declared
|
254 |
# LDAP requests are allowed if an external server is declared
|
263 |
if [ $LDAP = on ]
|
255 |
if [ $LDAP = on ]
|
264 |
then
|
256 |
then
|
265 |
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport ldap -j ACCEPT
|
257 |
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport ldap -j ACCEPT
|
266 |
$IPTABLES -A OUTPUT -o $EXTIF -p udp --dport ldap -j ACCEPT
|
258 |
$IPTABLES -A OUTPUT -o $EXTIF -p udp --dport ldap -j ACCEPT
|
267 |
fi
|
259 |
fi
|
268 |
# Traduction dynamique d'adresse en sortie
|
260 |
# Traduction dynamique d'adresse en sortie
|
269 |
# Dynamic NAT on EXTIF
|
261 |
# Dynamic NAT on EXTIF
|
270 |
$IPTABLES -A POSTROUTING -t nat -o $EXTIF -j MASQUERADE
|
262 |
$IPTABLES -A POSTROUTING -t nat -o $EXTIF -j MASQUERADE
|
271 |
|
263 |
|
272 |
# Save all rules
|
264 |
# Save all rules
|
273 |
/etc/init.d/iptables save
|
265 |
/etc/init.d/iptables save
|
274 |
|
266 |
|
275 |
# End of script
|
267 |
# End of script
|
276 |
|
268 |
|
277 |
|
269 |
|