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#!/bin/bash
# $Id: alcasar-iptables.sh 2386 2017-08-22 16:38:58Z tom.houdayer $
# 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
BL_IP_CAT="/usr/local/share/iptables-bl-enabled" # categories files of the BlackListed IP
WL_IP_CAT="/usr/local/share/iptables-wl-enabled" # categories files of the WhiteListed IP
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
# Sauvegarde des SET des utilisateurs connectés si ils existent
# Saving SET of connected users if it exists
ipset list not_filtered 1>/dev/null 2>&1
if [ $? -eq 0 ];
then
ipset save not_filtered > $TMP_users_set_save
ipset save havp >> $TMP_users_set_save
ipset save havp_bl >> $TMP_users_set_save
ipset save havp_wl >> $TMP_users_set_save
ipset save proto_0 >> $TMP_users_set_save
ipset save proto_1 >> $TMP_users_set_save
ipset save proto_2 >> $TMP_users_set_save
ipset save proto_3 >> $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
$IPTABLES -t nat -P OUTPUT ACCEPT
#############################
# IPSET #
#############################
# destruction de tous les SET
# destroy all SET
ipset flush
ipset destroy
###### BL set ###########
# Calcul de la taille / Compute the length
bl_set_length=$(wc -l $BL_IP_CAT/* | awk '{print $1}' | tail -n 1)
# Chargement / loading
echo "create bl_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
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 bl_ip_blocked $ip
done
###### WL set ###########
# taille fixe, car peupler par dnsmasq / fixe length due to dnsmasq dynamic loading
wl_set_length=65536
# Chargement Loading
echo "create wl_ip_allowed hash:net family inet hashsize 1024 maxelem $wl_set_length" > $TMP_set_save
#get ip-wl files from ACC
for category in `ls -1 $WL_IP_CAT |cut -d '@' -f1`
do
cat $WL_IP_CAT/$category >> $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 $TMP_users_set_save
else
ipset create not_filtered hash:ip hashsize 1024
ipset create havp hash:ip hashsize 1024
ipset create havp_bl hash:ip hashsize 1024
ipset create havp_wl hash:ip hashsize 1024
#pour les filtrages de protocole par utilisateur
ipset create proto_0 hash:ip hashsize 1024
ipset create proto_1 hash:ip hashsize 1024
ipset create proto_2 hash:ip hashsize 1024
ipset create proto_3 hash:ip hashsize 1024
fi
#############################
# PREROUTING #
#############################
# Marquage des paquets qui tentent d'accéder directement à un serveur sans authentification en mode proxy pour pouvoir les rejeter en INPUT
# Mark packets that attempt to directly access a server without authentication with proxy client to reject them in INPUT rules
#$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 direct attempts to TCP port 8090 (dansguardian) in order to REJECT them in INPUT rules
$IPTABLES -A PREROUTING -t nat -i $TUNIF -p tcp -d $PRIVATE_IP -m tcp --dport 8080 -j NFLOG --nflog-group 1 --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 direct attempts to TCP port 8090 (tinyproxy) in order 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-group 1 --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 54 (DNS-blacklist) pour pouvoir les rejeter en INPUT
# Mark the direct attempts to port 54 (DNS-blacklist) in order 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
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p udp --dport 54 -j MARK --set-mark 3
# Marquage des paquets qui tentent d'accéder directement au port 55 (DNS-Whitelist) pour pouvoir les rejeter en INPUT
# Mark the direct attempts to port 55 (DNS-whitelist) in order 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
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p udp --dport 55 -j MARK --set-mark 4
# Marquage des paquets qui tentent d'accéder directement au port 56 (DNS-Blackhole) pour pouvoir les rejeter en INPUT
# Mark the direct attempts to port 56 (DNS-blackhole) in order 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
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p udp --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 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_wl' users to port 55
$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set --match-set havp_wl 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 src ! -d $PRIVATE_IP -p tcp --dport http -m state --state NEW -j NFLOG --nflog-group 1 --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 src -m set --match-set bl_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 src -m set ! --match-set wl_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 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 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 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 54 (DNS-blacklist). Les packets concernés ont été marqués dans la table mangle (PREROUTING)
# Deny direct connections on port 54 (DNS-blacklist). The concerned paquets are marked in mangle table (PREROUTING)
$IPTABLES -A INPUT -i $TUNIF -p udp --dport 54 -m mark --mark 3 -j REJECT --reject-with icmp-port-unreachable
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 54 -m mark --mark 3 -j REJECT --reject-with tcp-reset
# On interdit les connexions directes au port 55 (DNS-whitelist). Les packets concernés ont été marqués dans la table mangle (PREROUTING)
# Deny direct connections on port 55 (DNS-whitelist). The concerned paquets are marked in mangle table (PREROUTING)
$IPTABLES -A INPUT -i $TUNIF -p udp --dport 55 -m mark --mark 4 -j REJECT --reject-with icmp-port-unreachable
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 55 -m mark --mark 3 -j REJECT --reject-with tcp-reset
# On interdit les connexions directes au port 56 (DNS-Blackhole). Les packets concernés ont été marqués dans la table mangle (PREROUTING)
# Deny direct connections on port 56 (DNS-blackhole). The concerned paquets are marked in mangle table (PREROUTING)
$IPTABLES -A INPUT -i $TUNIF -p udp --dport 56 -m mark --mark 5 -j REJECT --reject-with icmp-port-unreachable
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 56 -m mark --mark 3 -j REJECT --reject-with tcp-reset
# 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
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --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
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --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
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --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
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport domain -j ACCEPT # DNS
$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 3990:3991 -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-group 1 --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-group 1 --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 bl_ip_blocked pour le SET havp_bl
# Deny IPs of the SET bl_ip_blocked for the set havp_bl
$IPTABLES -A FORWARD -i $TUNIF -m set --match-set havp_bl src -m set --match-set bl_ip_blocked dst -p icmp -j REJECT --reject-with icmp-host-prohibited
$IPTABLES -A FORWARD -i $TUNIF -m set --match-set havp_bl src -m set --match-set bl_ip_blocked dst -p udp -j REJECT --reject-with icmp-host-prohibited
$IPTABLES -A FORWARD -i $TUNIF -m set --match-set havp_bl src -m set --match-set bl_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
# Active le suivi de session
# Allow Conntrack
$IPTABLES -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT
# 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 NETFLOW
$IPTABLES -A FORWARD -i $TUNIF -d $ip_allowed -m state --state NEW -j ACCEPT
done < /usr/local/etc/alcasar-uamallowed
fi
# filtrage protocole par utilisateur (profile 1 : http, https)
# protocols filtering for users (profil 1 : http, https)
$IPTABLES -A FORWARD -i $TUNIF -m set --match-set proto_1 src -s $PRIVATE_NETWORK_MASK -p tcp -m multiport ! --dports http,https -m state --state NEW -j REJECT --reject-with tcp-reset
$IPTABLES -A FORWARD -i $TUNIF -m set --match-set proto_1 src -s $PRIVATE_NETWORK_MASK -p udp -m multiport ! --dports http,https -m state --state NEW -j REJECT --reject-with icmp-port-unreachable
# filtrage protocole par utilisateur (profile 2 : http https pop3 pop3s imap imaps ftp sftp ssh)
# protocols filtering for users (profil 2 : http https pop3 pop3s imap imaps ftp sftp ssh)
$IPTABLES -A FORWARD -i $TUNIF -m set --match-set proto_2 src -s $PRIVATE_NETWORK_MASK -p tcp -m multiport ! --dports http,https,pop3,pop3s,imap,imaps,ftp,ftp-data,sftp,ssh -m state --state NEW -j REJECT --reject-with tcp-reset
$IPTABLES -A FORWARD -i $TUNIF -m set --match-set proto_2 src -s $PRIVATE_NETWORK_MASK -p udp -m multiport ! --dports http,https,pop3,pop3s,imap,imaps,ssh -m state --state NEW -j REJECT --reject-with icmp-port-unreachable
# filtrage protocole par utilisateur (profile 3 : personnalisable via l'ACC)
# protocols filtering for users (profil 3 : customized with ACC)
#profile 3 personalisables via l'ACC
custom_tcp_protocols_list='';custom_udp_protocols_list=''
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 [ $svc_name = "icmp" ]
then
svc_icmp="on"
else
if [ "$custom_tcp_protocols_list" == "" ]
then
custom_tcp_protocols_list=$svc_port
else
custom_tcp_protocols_list=`echo $custom_tcp_protocols_list","$svc_port`
fi
udp_svc=`egrep "[[:space:]]$svc_port/udp" /etc/services|wc -l`
if [ $udp_svc = "1" ] # udp service exist
then
if [ "$custom_udp_protocols_list" == "" ]
then
custom_udp_protocols_list=$svc_port
else
custom_udp_protocols_list=`echo $custom_udp_protocols_list","$svc_port`
fi
fi
fi
fi
done < /usr/local/etc/alcasar-services
if [ "$custom_tcp_protocols_list" == "" ]
then
$IPTABLES -A FORWARD -i $TUNIF -m set --match-set proto_3 src -s $PRIVATE_NETWORK_MASK -j REJECT
else
if [ "$svc_icmp" != "on" ]
then
$IPTABLES -A FORWARD -i $TUNIF -m set --match-set proto_3 src -s $PRIVATE_NETWORK_MASK -p icmp -j REJECT --reject-with icmp-proto-unreachable
fi
$IPTABLES -A FORWARD -i $TUNIF -m set --match-set proto_3 src -s $PRIVATE_NETWORK_MASK -p tcp -m multiport ! --dports $custom_tcp_protocols_list -m state --state NEW -j REJECT --reject-with tcp-reset
$IPTABLES -A FORWARD -i $TUNIF -m set --match-set proto_3 src -s $PRIVATE_NETWORK_MASK -p udp -m multiport ! --dports $custom_udp_protocols_list -m state --state NEW -j REJECT --reject-with icmp-port-unreachable
fi
# journalisation et 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 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 HTTPS sortantes
# HTTPS requests are allowed
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport https -j ACCEPT
# On autorise les requêtes RSYNC sortantes (maj BL de Toulouse)
# RSYNC requests are allowed (to update BL of Toulouse)
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport rsync -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