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#!/bin/bash
# $Id: alcasar-iptables.sh 1393 2014-06-19 08:44:51Z richard $
# 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/eth1 by coova
conf_file="/usr/local/etc/alcasar.conf"
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
PUBLIC_IP=`echo $public_ip_mask | cut -d"/" -f1`
dns1=`grep ^DNS1= $conf_file|cut -d"=" -f2` # first public DNS server
dns1=${dns1:=208.67.220.220}
dns2=`grep ^DNS2= $conf_file|cut -d"=" -f2` # second public DNS server
dns2=${dns2:=208.67.222.222}
DNSSERVERS="$dns1,$dns2" # first and second DNS IP servers addresses
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
WL_IP_OSSI="/usr/local/share/ossi-ip-wl" # ip of the whitelist
DNSMASQ_WL_ENABLED="/usr/local/share/dnsmasq-wl-enabled" # enabled domain names for the Whitelist
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
QOS=`grep ^QOS= $conf_file|cut -d"=" -f2` # QOS (on/off)
QOS=${QOS:=off}
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"}
EXTIF="enp1s0"
INTIF="enp2s0"
TUNIF="tun0" # listen device for chilli daemon
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
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
$IPTABLES -t nat -P OUTPUT ACCEPT
# destruction de tous les SET
# destroy all SET
ipset destroy
# Calcul de la taille du set de la blacklist
# Compute the blacklist set length
bl_set_length=$(($(wc -l $BL_IP_CAT/* | awk '{print $1}' | tail -n 1)+$(wc -l $BL_IP_OSSI | awk '{print $1}')))
# Création du fichier set temporaire, remplissage, chargement et suppression
# Creating the temporary set file, filling, loading and deleting
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
# Extraction des ip réhabilitées
# Extracting rehabilitated ip
for ip in $(cat $IP_REHABILITEES)
do
ipset del blacklist_ip_blocked $ip
done
# Calcul de la taille du set de la whitelist
# Compute the whitelist set length
wl_set_length=$(($(wc -l $DNSMASQ_WL_ENABLED/* | awk '{print $1}' | tail -n 1)*3))
# Création du fichier set temporaire, remplissage, chargement et suppression
# Creating the temporary set file, filling, loading and deleting
echo "create whitelist_ip_allowed hash:net family inet hashsize 1024 maxelem $wl_set_length" > $TMP_set_save
cat $WL_IP_OSSI >> $TMP_set_save
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
fi
#############################
# PREROUTING #
#############################
# Marquage (et journalisation) des paquets qui tentent d'accéder directement à 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 ULOG --ulog-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 udp 54 pour pouvoir les rejeter en INPUT
# Mark (and log) the udp 54 direct attempts to REJECT them in INPUT rules
# $IPTABLES -A PREROUTING -t nat -i $TUNIF -p udp -d $PRIVATE_IP -m udp --dport 54 -j ULOG --ulog-prefix "RULE DNS-proxy -- DENY "
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp --dport 54 -j MARK --set-mark 2
# Marquage (et journalisation) des paquets qui tentent d'accéder directement au port udp 55 pour pouvoir les rejeter en INPUT
# Mark (and log) the udp 55 direct attempts to REJECT them in INPUT rules
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp --dport 55 -j MARK --set-mark 3
# Marquage (et journalisation) des paquets qui tentent d'accéder directement au port 8090 pour pouvoir les rejeter en INPUT
# Mark (and log) the 8090 direct attempts to REJECT them in INPUT rules
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp -m tcp --dport 8090 -j MARK --set-mark 4
# Marquage (et journalisation) des paquets qui tentent d'accéder directement au port 8091 pour pouvoir les rejeter en INPUT
# Mark (and log) the 8091 direct attempts to REJECT them in INPUT rules
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp -m tcp --dport 8091 -j MARK --set-mark 5
# havp_bl_set --> redirection vers le port 54
# havp_bl_set --> redirect 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
# havp_wl_set --> redirection vers le port 55
# havp_wl_set --> redirect 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
# Redirection des requêtes HTTP des IP de la blacklist vers ALCASAR (page 'accès interdit') pour le set havp_bl_set
# Redirect outbound HTTP requests from blacklist IP to ALCASAR ('access denied' page) for the set havp_bl_set
$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 des requêtes HTTP des IP qui ne sont pas dans la whitelist vers ALCASAR (page 'accès interdit') pour le set havp_wl_set
# Redirect outbound HTTP requests from IP which are not in the whitelist to ALCASAR ('access denied' page) for the set havp_wl_set
$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
# Journalisation des requètes HTTP vers Internet (seulement les paquets SYN) - Les autres protocoles sont journalisés en FORWARD par netflow
## Log HTTP requests to Internet (only syn packets) - Other protocols are log in FORWARD by netflow
$IPTABLES -A PREROUTING -t nat -i $TUNIF -s $PRIVATE_NETWORK_MASK ! -d $PRIVATE_IP -p tcp --dport http -m state --state NEW -j ULOG --ulog-prefix "RULE F_http -- ACCEPT "
# Redirection des requêtes HTTP sortantes vers HAVP (8091) pour le set havp_set
# Redirect outbound HTTP requests to HAVP (8091) for the set havp_set
$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 8091
# Redirection des requêtes HTTP sortantes vers DansGuardian (proxy transparent) pour le set havp_bl_set
# Redirect outbound HTTP requests to DansGuardian (transparent proxy) for the set havp_bl_set
$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 vers HAVP pour le set havp_wl_set
# Redirect outbound HTTP requests to HAVP for the set havp_wl_set
$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 8091
# 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
# 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 -i $EXTIF -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 are 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 UDP 54. Les packets concernés ont été marqués dans la table mangle (PREROUTING)
# Deny direct connections on UDP 54. The concerned paquets are marked in mangle table (PREROUTING)
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 54 -m mark --mark 2 -j REJECT --reject-with icmp-port-unreachable
# On interdit les connexions directes au port UDP 55. Les packets concernés ont été marqués dans la table mangle (PREROUTING)
# Deny direct connections on UDP 55. The concerned paquets are marked in mangle table (PREROUTING)
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 55 -m mark --mark 3 -j REJECT --reject-with icmp-port-unreachable
# On interdit les connexions directes au port 8090. Les packets concernés ont été marqués dans la table mangle (PREROUTING)
# Deny direct connections on 8090. The concerned paquets are marked in mangle table (PREROUTING)
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 8090 -m mark --mark 4 -j REJECT --reject-with tcp-reset
# On interdit les connexions directes au port 8091. Les packets concernés ont été marqués dans la table mangle (PREROUTING)
# Deny direct connections on 8091. The concerned paquets are marked in mangle table (PREROUTING)
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 8091 -m mark --mark 5 -j REJECT --reject-with tcp-reset
# Autorisation des connexions légitimes à HAVP
# Allow connections for HAVP
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -p tcp --dport 8090 -m state --state NEW --syn -j ACCEPT
# Autorisation des connexions légitimes à HAVP
# Allow connections for HAVP
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -p tcp --dport 8091 -m state --state NEW --syn -j ACCEPT
# 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
# 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 ULOG --ulog-nlgroup 2 --ulog-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 ULOG --ulog-nlgroup 2 --ulog-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 ULOG --ulog-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 ULOG --ulog-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 ULOG --ulog-nlgroup 3 --ulog-qthreshold 10 --ulog-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 ULOG --ulog-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 des protocoles non commentés
# # Allow non comment protocols
# 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 $svc_port -m state --state NEW -j ULOG --ulog-prefix "RULE F_TCP-$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 $svc_port -m state --state NEW -j ULOG --ulog-prefix "RULE F_UDP-$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 ULOG --ulog-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
# If QOS is activate #
if [ $QOS = on ] && [ -e /usr/local/etc/alcasar-iptables-qos.sh ]; then
. /usr/local/etc/alcasar-iptables-qos.sh
fi
# Autorisation des connections sortant du LAN
# Allow forward connections with log
#$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
# 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 ip_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