Subversion Repositories ALCASAR

#!/bin/bash

# $Id: alcasar-iptables.sh 1852 2016-05-01 18:46:46Z raphael.pion $

# Script de mise en place des regles du parefeu d'Alcasar (mode normal)

# This script writes the netfilter rules for ALCASAR

# Rexy - 3abtux - CPN

#

# Reminders

# There are four channels for log :

#	1 tracability of the consultation equipment with The 'Netflow' kernel module (iptables target = NETFLOW);

#	2 protection of ALCASAR with the Ulog group 1 (default group) 

#	3 SSH on ALCASAR with the Ulog group 2;

#	4 extern access attempts on ALCASAR with the Ulog group 3.

# The bootps/dhcp (67) port is always open on tun0/INTIF by coova 

CONF_FILE="/usr/local/etc/alcasar.conf"

EXTIF=`grep ^EXTIF= $CONF_FILE|cut -d"=" -f2`				# EXTernal InterFace

INTIF=`grep ^INTIF= $CONF_FILE|cut -d"=" -f2`				# INTernal InterFace

TUNIF="tun0"								# listen device for chilli daemon

private_ip_mask=`grep ^PRIVATE_IP= $CONF_FILE|cut -d"=" -f2`

private_ip_mask=${private_ip_mask:=192.168.182.1/24}

PRIVATE_IP=`echo $private_ip_mask | cut -d"/" -f1`			# ALCASAR LAN IP address

private_network=`/bin/ipcalc -n $private_ip_mask|cut -d"=" -f2`		# LAN IP address (ie.: 192.168.182.0)

private_prefix=`/bin/ipcalc -p $private_ip_mask|cut -d"=" -f2`		# LAN prefix (ie. 24)

PRIVATE_NETWORK_MASK=$private_network/$private_prefix			# Lan IP address + prefix (192.168.182.0/24)

public_ip_mask=`grep ^PUBLIC_IP= $CONF_FILE|cut -d"=" -f2`		# ALCASAR WAN IP address

if [[ "$public_ip_mask" == "dhcp" ]]

then

	PTN="\b(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\/([012]?[0-9]|3[0-2])\b"

	public_ip_mask=`ip addr show $EXTIF | egrep -o $PTN`

fi

PUBLIC_IP=`echo $public_ip_mask | cut -d"/" -f1`

dns1=`grep ^DNS1= $CONF_FILE|cut -d"=" -f2`

dns2=`grep ^DNS2= $CONF_FILE|cut -d"=" -f2`

dns1=${dns1:=208.67.220.220}

dns2=${dns2:=208.67.222.222}

DNSSERVERS="$dns1,$dns2"						# first and second public DNS servers

PROTOCOLS_FILTERING=`grep ^PROTOCOLS_FILTERING= $CONF_FILE|cut -d"=" -f2`	# Network protocols filter (on/off)

PROTOCOLS_FILTERING=${PROTOCOLS_FILTERING:=off}

BL_IP_CAT="/usr/local/share/iptables-bl-enabled"			# categories files of the BlackListed IP

BL_IP_OSSI="/usr/local/share/iptables-bl/ossi"				# ossi categoty

DIR_WL_IP_ENABLED="/usr/local/share/iptables-wl-enabled/"				# ip files repository of the WL (feature : imported wl file from ACC)

TMP_users_set_save="/tmp/users_set_save"				# tmp file for backup users set 

TMP_set_save="/tmp/ipset_save"						# tmp file for blacklist and whitelist creation

SSH=`grep ^SSH= $CONF_FILE|cut -d"=" -f2`				# sshd active (on/off)

SSH=${SSH:=off}

SSH_ADMIN_FROM=`grep ^SSH_ADMIN_FROM= $CONF_FILE|cut -d"=" -f2`

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)

LDAP=`grep ^LDAP= $CONF_FILE|cut -d"=" -f2`				# LDAP external server active (on/off)

LDAP=${LDAP:=off}

LDAP_IP=`grep ^LDAP_IP= $CONF_FILE|cut -d"=" -f2`			# WAN IP address to reduce LDAP WAN access (all ip allowed on LAN side)

LDAP_IP=${LDAP_IP:="0.0.0.0/0.0.0.0"}

IPTABLES="/sbin/iptables"

IP_REHABILITEES="/etc/dansguardian/lists/exceptioniplist"		# Rehabilitated IP

SAVE_DIR="/etc/sysconfig"						# Saving path

# Sauvegarde des SET des utilisateurs connectés si ils existent

# Saving SET of connected users if it exists

ipset list no_filtering_set 1>/dev/null 2>&1

if [ $? -eq 0 ];

then

	ipset save no_filtering_set > $TMP_users_set_save

	ipset save havp_set >> $TMP_users_set_save

	ipset save havp_bl_set >> $TMP_users_set_save

	ipset save havp_wl_set >> $TMP_users_set_save

	ipset save user_not_connected_yet >> $TMP_users_set_save

	ipset save ipset_users_list >> $TMP_users_set_save

fi

# loading of NetFlow probe (ipt_NETFLOW kernel module)

modprobe ipt_NETFLOW destination=127.0.0.1:2055

# Effacement des règles existantes

# Flush all existing rules

$IPTABLES -F

$IPTABLES -t nat -F

$IPTABLES -t mangle -F

$IPTABLES -F INPUT

$IPTABLES -F FORWARD

$IPTABLES -F OUTPUT

# Suppression des chaines utilisateurs sur les tables filter et nat

# Flush non default rules on filter and nat tables

$IPTABLES -X

$IPTABLES -t nat -X

# Stratégies par défaut

# Default policies

$IPTABLES -P INPUT DROP

$IPTABLES -P FORWARD DROP

$IPTABLES -P OUTPUT DROP

$IPTABLES -t nat -P PREROUTING ACCEPT

$IPTABLES -t nat -P POSTROUTING ACCEPT

$IPTABLES -t nat -P OUTPUT ACCEPT

#############################

#          IPSET            #

#############################

# destruction de tous les SET

# destroy all SET

ipset destroy

###### BL set  ###########

# Calcul de la taille / Compute the length

bl_set_length=$(($(wc -l $BL_IP_CAT/* | awk '{print $1}' | tail -n 1)+$(wc -l $BL_IP_OSSI | awk '{print $1}')))

# Chargement / loading

echo "create blacklist_ip_blocked hash:net family inet hashsize 1024 maxelem $bl_set_length" > $TMP_set_save

for category in `ls -1 $BL_IP_CAT | cut -d '@' -f1`

do

	cat $BL_IP_CAT/$category >> $TMP_set_save

done

cat $BL_IP_OSSI >> $TMP_set_save

ipset -! restore < $TMP_set_save

rm -f $TMP_set_save

# Suppression des ip réhabilitées / Removing of rehabilitated ip

for ip in $(cat $IP_REHABILITEES)

do

	ipset del blacklist_ip_blocked $ip

done

###### WL set  ###########

# Calcul de la taille / Compute the length

wl_set_length=$(($(wc -l $DIR_WL_IP_ENABLED/* | awk '{print $1}' | tail -n 1)*3))

# Chargement Loading

echo "create whitelist_ip_allowed hash:net family inet hashsize 1024 maxelem $wl_set_length" > $TMP_set_save

#get ip-wl files from ACC

for ossi in `ls -1 $DIR_WL_IP_ENABLED`

do

	echo $ossi

	cat $DIR_WL_IP_ENABLED/$ossi >> $TMP_set_save

done

ipset -! restore < $TMP_set_save

rm -f $TMP_set_save

# Restoration des SET des utilisateurs connectés si ils existent sinon création des SET 

# Restoring the connected users SETs if available, otherwise creating SETs

if [ -e $TMP_users_set_save ];

then

	ipset -! restore < $TMP_users_set_save

	rm -f $TMP_users_set_save

else

	ipset create no_filtering_set hash:net hashsize 1024

	ipset create havp_set hash:net hashsize 1024

	ipset create havp_bl_set hash:net hashsize 1024

	ipset create havp_wl_set hash:net hashsize 1024

	#utilisé pour l'interception des utilisateurs non authentifiés au réseau

	#used for intercepting users not connected to the network

	ipset create user_not_connected_yet hash:net hashsize 1024

	ipset create ipset_users_list list:set

	ipset add ipset_users_list havp_set

	ipset add ipset_users_list havp_wl_set

	ipset add ipset_users_list havp_bl_set

	ipset add ipset_users_list no_filtering_set

	ipset add ipset_users_list user_not_connected_yet

fi

#############################

#       PREROUTING          #

#############################

# Redirection des requetes DNS des utilisateurs non connectés dans le DNS-Blackhole

# Redirect users not connected DNS requests in DNS-Blackhole

$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set ! --match-set ipset_users_list src -d $PRIVATE_IP -p tcp --dport domain -j REDIRECT --to-port 56

$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set ! --match-set ipset_users_list src -d $PRIVATE_IP -p udp --dport domain -j REDIRECT --to-port 56

# Marquage des paquets qui tentent d'accéder directement à un serveur sans authentification en mode proxy pour pouvoir les rejeter en INPUT

# Mark packets that attempt to directly access a server without authentication with proxy client to reject them in INPUT rules

#$IPTABLES -A PREROUTING -t mangle -i $TUNIF -s $PRIVATE_NETWORK_MASK -p tcp -m tcp --dport 80 -m string --string 'GET http' --algo bm --from 50 --to 70 -j MARK --set-mark 10

# Marquage (et journalisation) des paquets qui tentent d'accéder directement au 8080 (DansGuardian) pour pouvoir les rejeter en INPUT

# mark (and log) the dansguardian bypass attempts in order to DROP them in INPUT rules

$IPTABLES -A PREROUTING -t nat -i $TUNIF -p tcp -d $PRIVATE_IP -m tcp --dport 8080 -j NFLOG --nflog-prefix "RULE direct-proxy -- DENY "

$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp -m tcp --dport 8080 -j MARK --set-mark 1

# Marquage (et journalisation) des paquets qui tentent d'accéder directement au port 8090 (tinyproxy) pour pouvoir les rejeter en INPUT

# Mark (and log) the 8090 direct attempts to REJECT them in INPUT rules

$IPTABLES -A PREROUTING -t nat -i $TUNIF -p tcp -d $PRIVATE_IP -m tcp --dport 8090 -j NFLOG --nflog-prefix "RULE direct-proxy -- DENY "

$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp -m tcp --dport 8090 -j MARK --set-mark 2

# Marquage des paquets qui tentent d'accéder directement au port udp 54 (DNS-blacklist) pour pouvoir les rejeter en INPUT

# Mark the udp 54 direct attempts (DNS-blacklist) to REJECT them in INPUT rules

$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp --dport 54 -j MARK --set-mark 3

# Marquage des paquets qui tentent d'accéder directement au port udp 55 (DNS-Whitelist) pour pouvoir les rejeter en INPUT

# Mark the udp 55 direct attempts (DNS-whitelist) to REJECT them in INPUT rules

$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp --dport 55 -j MARK --set-mark 4

# Marquage des paquets qui tentent d'accéder directement au port udp 56 (DNS-Blackhole) pour pouvoir les rejeter en INPUT

# Mark the udp 56 direct attempts (DNS-blackhole) to REJECT them in INPUT rules

$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp --dport 56 -j MARK --set-mark 5

# redirection DNS des usagers 'havp_bl' vers le port 54

# redirect DNS of 'havp_bl' users to port 54

$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set --match-set havp_bl_set src -d $PRIVATE_IP -p udp --dport domain -j REDIRECT --to-port 54

# redirection DNS des usagers 'havp_wl' vers le port 55

# redirect DNS of 'havp_bl' users to port 55

$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set --match-set havp_wl_set src -d $PRIVATE_IP -p udp --dport domain -j REDIRECT --to-port 55

# Journalisation HTTP_Internet des usagers 'havp_bl' (paquets SYN uniquement). Les autres protocoles sont journalisés en FORWARD par netflow. 

# Log Internet HTTP of 'havp_bl' users" (only syn packets). Other protocols are logged in FORWARD by netflow

$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set --match-set havp_bl_set src ! -d $PRIVATE_IP -p tcp --dport http -m state --state NEW -j NFLOG --nflog-prefix "RULE F_http -- ACCEPT "

# Redirection HTTP des usagers 'havp_bl' cherchant à joindre les IP de la blacklist vers ALCASAR (page 'accès interdit')

# Redirect HTTP of 'havp_bl' users who want blacklist IP to ALCASAR ('access denied' page)

$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set --match-set havp_bl_set src -m set --match-set blacklist_ip_blocked dst -p tcp --dport http -j REDIRECT --to-port 80

# Redirection HTTP des usagers 'havp_wl' cherchant à joindre les IP qui ne sont pas dans la WL vers ALCASAR (page 'accès interdit')

# Redirect HTTP of 'havp_wl' users who want IP not in the WL to ALCASAR ('access denied' page)

$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set --match-set havp_wl_set src -m set ! --match-set whitelist_ip_allowed dst -p tcp --dport http -j REDIRECT --to-port 80

# Redirection des requêtes HTTP sortantes des usagers 'havp_bl' vers DansGuardian

# Redirect outbound HTTP requests of "BL" users to DansGuardian (transparent proxy)

$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set --match-set havp_bl_set src ! -d $PRIVATE_IP -p tcp --dport http -j REDIRECT --to-port 8080

# Redirection des requêtes HTTP sortantes des usager 'havp_wl' et 'havp' vers Tinyproxy

# Redirect outbound HTTP requests for "WL-antivirus" users to Tinyproxy

$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set --match-set havp_wl_set src ! -d $PRIVATE_IP -p tcp --dport http -j REDIRECT --to-port 8090

$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set --match-set havp_set src ! -d $PRIVATE_IP -p tcp --dport http -j REDIRECT --to-port 8090

# Redirection des requêtes NTP vers le serveur NTP local

# Redirect NTP request in local NTP server

$IPTABLES -A PREROUTING -t nat -i $TUNIF -s $PRIVATE_NETWORK_MASK ! -d $PRIVATE_IP -p udp --dport ntp -j REDIRECT --to-port 123

#############################

#         INPUT             #

#############################

# Tout passe sur loopback

# accept all on loopback

$IPTABLES -A INPUT -i lo -j ACCEPT

$IPTABLES -A OUTPUT -o lo -j ACCEPT

# Rejet des demandes de connexions non conformes (FIN-URG-PUSH, XMAS, NullScan, SYN-RST et NEW not SYN)

# Drop non standard connexions (FIN-URG-PUSH, XMAS, NullScan, SYN-RST et NEW not SYN)

$IPTABLES -A INPUT -p tcp --tcp-flags FIN,URG,PSH FIN,URG,PSH -j DROP

$IPTABLES -A INPUT -p tcp --tcp-flags ALL ALL -j DROP

$IPTABLES -A INPUT -p tcp --tcp-flags ALL NONE -j DROP

$IPTABLES -A INPUT -p tcp --tcp-flags SYN,RST SYN,RST -j DROP

$IPTABLES -A INPUT -p tcp -m tcp ! --syn -m state --state NEW -j DROP

# Si configéré, on autorise les réponses DHCP 

# Allow DHCP answers if configured

public_ip_mask=`grep ^PUBLIC_IP= $CONF_FILE|cut -d"=" -f2`		# ALCASAR WAN IP address

if [[ "$public_ip_mask" == "dhcp" ]]

then

	$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport 68 -j ACCEPT

	$IPTABLES -A OUTPUT -o $EXTIF -p udp --dport 68 -j ACCEPT

fi

# On rejette les trame en broadcast et en multicast sur EXTIF (évite leur journalisation)

# Drop broadcast & multicast on EXTIF to avoid log 

$IPTABLES -A INPUT -m addrtype --dst-type BROADCAST,MULTICAST -j DROP

# On autorise les retours de connexions légitimes par INPUT

# Conntrack on INPUT

$IPTABLES -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT

# On interdit les connexions directes au port utilisé par DansGuardian (8080). Les packets concernés ont été marqués et loggués dans la table mangle (PREROUTING)

# Deny direct connections on DansGuardian port (8080). The concerned paquets have been marked and logged in mangle table (PREROUTING)

$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 8080 -m mark --mark 1 -j REJECT --reject-with tcp-reset

# Autorisation des connexions légitimes à DansGuardian 

# Allow connections for DansGuardian

$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -p tcp --dport 8080 -m state --state NEW --syn -j ACCEPT

# On interdit les connexions directes au port utilisé par tinyproxy (8090). Les packets concernés ont été marqués et loggués dans la table mangle (PREROUTING)

# Deny direct connections on tinyproxy port (8090). The concerned paquets have been marked in mangle table (PREROUTING)

$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 8090 -m mark --mark 2 -j REJECT --reject-with tcp-reset

# Autorisation des connexions légitimes vers tinyproxy 

# Allow connections to tinyproxy

$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -p tcp --dport 8090 -m state --state NEW --syn -j ACCEPT

# On interdit les connexions directes au port UDP 54 (DNS-blacklist). Les packets concernés ont été marqués dans la table mangle (PREROUTING)

# Deny direct connections on UDP 54 (DNS-blacklist). The concerned paquets are marked in mangle table (PREROUTING)

$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 54 -m mark --mark 3 -j REJECT --reject-with icmp-port-unreachable

# On interdit les connexions directes au port UDP 55 (DNS-whitelist). Les packets concernés ont été marqués dans la table mangle (PREROUTING)

# Deny direct connections on UDP 55 (DNS-whitelist). The concerned paquets are marked in mangle table (PREROUTING)

$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 55 -m mark --mark 4 -j REJECT --reject-with icmp-port-unreachable

# On interdit les connexions directes au port UDP 56 (DNS-Blackhole). Les packets concernés ont été marqués dans la table mangle (PREROUTING)

# Deny direct connections on UDP 56 (DNS-blackhole). The concerned paquets are marked in mangle table (PREROUTING)

$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 56 -m mark --mark 5 -j REJECT --reject-with icmp-port-unreachable

# autorisation des connexion légitime à DNSMASQ (avec blacklist)

# Allow connections for DNSMASQ (with blacklist)

$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p udp --dport 54 -j ACCEPT

# autorisation des connexion légitime à DNSMASQ (avec whitelist)

# Allow connections for DNSMASQ (with whitelist)

$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p udp --dport 55 -j ACCEPT

# autorisation des connexion légitime à DNSMASQ (mode blackhole)

# Allow connections for DNSMASQ (blackhole mode)

$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p udp --dport 56 -j ACCEPT

# Accès direct aux services internes

# Internal services access

$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p udp --dport domain -j ACCEPT	# DNS non filtré # DNS without blacklist

$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p icmp --icmp-type 8 -j ACCEPT	# Réponse ping # ping responce

$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p icmp --icmp-type 0 -j ACCEPT	# Requête  ping # ping request

$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport https -j ACCEPT	# Pages d'authentification et MCC # authentication pages and MCC

$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport http -j ACCEPT	# Page d'avertissement filtrage # Filtering warning pages

$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport 3990 -j ACCEPT	# Requêtes de deconnexion usagers # Users logout requests

$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p udp --dport ntp -j ACCEPT	# Serveur local de temps # local time server

# SSHD rules if activate 

if [ $SSH = on ]

	then

	$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport ssh -m state --state NEW -j NFLOG --nflog-group 2 --nflog-prefix "RULE ssh-from-LAN -- ACCEPT"

	$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport ssh -j ACCEPT

	$IPTABLES -A INPUT -i $EXTIF -s $SSH_ADMIN_FROM -d $PUBLIC_IP -p tcp --dport ssh -m state --state NEW --syn -j NFLOG --nflog-group 2 --nflog-prefix "RULE ssh-from-WAN -- ACCEPT"

	$IPTABLES -A INPUT -i $EXTIF -s $SSH_ADMIN_FROM -d $PUBLIC_IP -p tcp --dport ssh -m state --state NEW -j ACCEPT

fi

# Insertion de règles locales

# Here, we add local rules (i.e. VPN from Internet)

if [ -f /usr/local/etc/alcasar-iptables-local.sh ]; then

        . /usr/local/etc/alcasar-iptables-local.sh

fi

# Journalisation et rejet des connexions (autres que celles autorisées) effectuées depuis le LAN

# Deny and log on INPUT from the LAN

$IPTABLES -A INPUT -i $TUNIF -m state --state NEW -j NFLOG --nflog-prefix "RULE rej-int -- REJECT "

$IPTABLES -A INPUT -i $TUNIF -p tcp -j REJECT --reject-with tcp-reset

$IPTABLES -A INPUT -i $TUNIF -p udp -j REJECT --reject-with icmp-port-unreachable

# Interdiction d'accès à INTIF (n'est utile que lorsque chilli est arrêté).

# Reject INTIF access (only when chilli is down)

$IPTABLES -A INPUT -i $INTIF -j NFLOG --nflog-prefix "RULE Protect1 -- REJECT "

$IPTABLES -A INPUT -i $INTIF -j REJECT

# Journalisation et rejet des connexions initiées depuis le réseau extérieur (test des effets du paramètre --limit en cours)

# On EXTIF, the access attempts are log in channel 2 (we should test --limit option to avoid deny of service)

$IPTABLES -A INPUT -i $EXTIF -m state --state NEW -j NFLOG --nflog-group 3 --nflog-threshold 10 --nflog-prefix "RULE rej-ext -- DROP"

#############################

#        FORWARD            #

#############################

# Blocage des IPs du SET blacklist_ip_blocked pour le SET havp_bl_set

# Deny IPs of the SET blacklist_ip_blocked for the set havp_bl_set

$IPTABLES -A FORWARD -i $TUNIF -m set --match-set havp_bl_set src -m set --match-set blacklist_ip_blocked dst -p icmp -j REJECT --reject-with icmp-port-unreachable

$IPTABLES -A FORWARD -i $TUNIF -m set --match-set havp_bl_set src -m set --match-set blacklist_ip_blocked dst -p udp -j REJECT --reject-with icmp-port-unreachable

$IPTABLES -A FORWARD -i $TUNIF -m set --match-set havp_bl_set src -m set --match-set blacklist_ip_blocked dst -p tcp -j REJECT --reject-with tcp-reset

# Rejet des requêtes DNS vers Internet

# Deny forward DNS

$IPTABLES -A FORWARD -i $TUNIF -p udp --dport domain -j REJECT --reject-with icmp-port-unreachable

$IPTABLES -A FORWARD -i $TUNIF -p tcp --dport domain -j REJECT --reject-with tcp-reset

# Autorisation des retours de connexions légitimes

$IPTABLES -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT

#  If protocols filter is activate

if [ $PROTOCOLS_FILTERING = on ]; then

	# Compute uamallowed IP (IP address of equipments connected between ALCASAR and Internet (DMZ, own servers, ...) 

	nb_uamallowed=`wc -l /usr/local/etc/alcasar-uamallowed | cut -d" "  -f1`

	if [ $nb_uamallowed != "0" ]

	then

		while read ip_allowed_line 

		do

			ip_allowed=`echo $ip_allowed_line|cut -d"\"" -f2`

			$IPTABLES -A FORWARD -i $TUNIF -d $ip_allowed -m state --state NEW -j NFLOG --nflog-prefix "RULE IP-allowed -- ACCEPT "

			$IPTABLES -A FORWARD -i $TUNIF -d $ip_allowed -m state --state NEW -j NETFLOW

			$IPTABLES -A FORWARD -i $TUNIF -d $ip_allowed -m state --state NEW -j ACCEPT

		done < /usr/local/etc/alcasar-uamallowed

	fi

	# Autorisation du HTTP et des protocoles non commentés

	# Allow HTTP and non comment protocols

	$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -p tcp --dport http -m state --state NEW -j NFLOG --nflog-prefix "RULE F_TCP-$svc_name -- ACCEPT "

	$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -p tcp --dport http -m state --state NEW -j NETFLOW

	$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -p tcp --dport http -m state --state NEW -j ACCEPT

	while read svc_line

	do

		svc_on=`echo $svc_line|cut -b1`

		if [ $svc_on != "#" ]

		then	

			svc_name=`echo $svc_line|cut -d" " -f1`

			svc_port=`echo $svc_line|cut -d" " -f2`

			if [ $svc_name = "icmp" ]

			then

				$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -p icmp -j NETFLOW

				$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -p icmp -j ACCEPT 

			else

				$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -p tcp --dport $svc_port -m state --state NEW -j NFLOG --nflog-prefix "RULE F_TCP-$svc_name -- ACCEPT "

				$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -p tcp --dport $svc_port -m state --state NEW -j NETFLOW

				$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -p tcp --dport $svc_port -m state --state NEW -j ACCEPT

				$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -p udp --dport $svc_port -m state --state NEW -j NFLOG --nflog-prefix "RULE F_UDP-$svc_name -- ACCEPT "

				$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -p udp --dport $svc_port -m state --state NEW -j NETFLOW

				$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -p udp --dport $svc_port -m state --state NEW -j ACCEPT

			fi

		fi

	done < /usr/local/etc/alcasar-services

	# Rejet explicite des autres protocoles

	# reject the others protocols

	$IPTABLES -A FORWARD -i $TUNIF -j NFLOG --nflog-prefix "RULE F_filter -- REJECT "

	$IPTABLES -A FORWARD -i $TUNIF -p tcp -j REJECT --reject-with tcp-reset

	$IPTABLES -A FORWARD -i $TUNIF -p udp -j REJECT --reject-with icmp-port-unreachable

	$IPTABLES -A FORWARD -i $TUNIF -p icmp -j REJECT 

fi

# Autorisation des connections sortant du LAN  

# Allow forward connections with log

#$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -m state --state NEW -j ULOG --ulog-prefix "RULE F_all -- ACCEPT "

$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -m state --state NEW -j NETFLOW

$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -m state --state NEW -j ACCEPT

#############################

#         OUTPUT            #

#############################

# On laisse tout sortir sur toutes les cartes sauf celle qui est connectée sur l'extérieur

# Everything is allowed but traffic through outside network interface

$IPTABLES -A OUTPUT ! -o $EXTIF -j ACCEPT

# Si configéré, on autorise les requêtes DHCP 

# Allow DHCP requests if configured

public_ip_mask=`grep ^PUBLIC_IP= $CONF_FILE|cut -d"=" -f2`		# ALCASAR WAN IP address

if [[ "$public_ip_mask" == "dhcp" ]]

then

	$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport 67 -j ACCEPT

	$IPTABLES -A OUTPUT -o $EXTIF -p udp --dport 67 -j ACCEPT

fi

# On autorise les requêtes DNS vers les serveurs DNS identifiés 

# Allow DNS requests to identified DNS servers

$IPTABLES -A OUTPUT -o $EXTIF -d $DNSSERVERS -p udp --dport domain -m state --state NEW -j ACCEPT

# On autorise les requêtes HTTP sortantes

# HTTP requests are allowed

$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport http -j NETFLOW

$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport http -j ACCEPT

# On autorise les requêtes FTP 

# FTP requests are allowed

modprobe nf_conntrack_ftp

$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport ftp -j ACCEPT

$IPTABLES -A OUTPUT -o $EXTIF -m state --state ESTABLISHED,RELATED -j ACCEPT

# On autorise les requêtes NTP 

# NTP requests are allowed

$IPTABLES -A OUTPUT -o $EXTIF -p udp --dport ntp -j ACCEPT

# On autorise les requêtes ICMP (ping) 

# ICMP (ping) requests are allowed

$IPTABLES -A OUTPUT -o $EXTIF -p icmp --icmp-type 8 -j ACCEPT

# On autorise les requêtes LDAP si un serveur externe est configué

# LDAP requests are allowed if an external server is declared

if [ $LDAP = on ]

	then

	$IPTABLES -A OUTPUT -p tcp -d $LDAP_IP -m multiport --dports ldap,ldaps -m state --state NEW,ESTABLISHED -j ACCEPT

	$IPTABLES -A OUTPUT -p udp -d $LDAP_IP -m multiport --dports ldap,ldaps -m state --state NEW,ESTABLISHED -j ACCEPT

fi

#############################

#       POSTROUTING         #

#############################

# Traduction dynamique d'adresse en sortie

# Dynamic NAT on EXTIF

$IPTABLES -A POSTROUTING -t nat -o $EXTIF -j MASQUERADE

# End of script