5,8 → 5,8 |
# by Rexy - 3abtux |
# This script is distributed under the Gnu General Public License (GPL) |
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# applique les regles du parefeu en mode ByPass |
# put the firewall rules in 'ByPass' mode |
# Applique les regles du parefeu en mode ByPass |
# Set the firewall rules in 'ByPass' mode |
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CONF_FILE="/usr/local/etc/alcasar.conf" |
private_ip_mask=`grep ^PRIVATE_IP= $CONF_FILE|cut -d"=" -f2` |
25,12 → 25,17 |
public_ip_mask=`ip addr show $EXTIF | egrep -o $PTN` |
fi |
PUBLIC_IP=`echo $public_ip_mask | cut -d"/" -f1` |
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) |
SSH_LAN=`grep ^SSH_LAN= $CONF_FILE|cut -d"=" -f2` # SSH LAN port |
SSH_LAN=${SSH_LAN:=0} |
SSH_WAN=`grep ^SSH_WAN= $CONF_FILE|cut -d"=" -f2` # SSH WAN port |
SSH_WAN=${SSH_WAN:=0} |
SSH_WAN_ADMIN_FROM=`grep ^SSH_ADMIN_FROM= $CONF_FILE|cut -d"=" -f2|cut -d"/" -f2` |
SSH_WAN_ADMIN_FROM=${SSH_WAN_ADMIN_FROM:="0.0.0.0"} |
SSH_WAN_ADMIN_FROM=$([ "$SSH_WAN_ADMIN_FROM" == "0.0.0.0" ] && echo "0.0.0.0/0" || echo "$SSH_WAN_ADMIN_FROM" ) |
SSH_LAN_ADMIN_FROM=`grep ^SSH_ADMIN_FROM= $CONF_FILE|cut -d"=" -f2|cut -d"/" -f1` |
SSH_LAN_ADMIN_FROM=${SSH_LAN_ADMIN_FROM:="0.0.0.0"} |
SSH_LAN_ADMIN_FROM=$([ "$SSH_LAN_ADMIN_FROM" == "0.0.0.0" ] && echo "$PRIVATE_NETWORK_MASK" || echo "$SSH_LAN_ADMIN_FROM" ) |
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# On vide (flush) toutes les règles existantes |
# Flush all existing rules |
$IPTABLES -F |
58,29 → 63,21 |
$IPTABLES -A OUTPUT -o lo -j ACCEPT |
$IPTABLES -A INPUT -i lo -j ACCEPT |
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# Insertion de règles de blocage (Devel) |
# Here, we add block rules (Devel) |
if [ -s /usr/local/etc/alcasar-ip-blocked ]; then |
while read ip_line |
do |
ip_on=`echo $ip_line|cut -b1` |
if [ $ip_on != "#" ] |
then |
ip_blocked=`echo $ip_line|cut -d" " -f1` |
$IPTABLES -A FORWARD -d $ip_blocked -j NFLOG --nflog-group 1 --nflog-prefix "RULE IP-blocked -- REJECT " |
$IPTABLES -A FORWARD -d $ip_blocked -j REJECT |
fi |
done < /usr/local/etc/alcasar-ip-blocked |
fi |
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############################# |
# INPUT # |
############################# |
# SSHD rules if activate |
if [ $SSH = on ] |
if [ $SSH_LAN -gt 0 ] |
then |
$IPTABLES -A INPUT -i $INTIF -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 $INTIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport ssh -m state --state NEW -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 |
$IPTABLES -A INPUT -i $INTIF -s $SSH_LAN_ADMIN_FROM -d $PRIVATE_IP -p tcp --dport $SSH_LAN -m conntrack --ctstate NEW -j NFLOG --nflog-group 2 --nflog-prefix "RULE ssh-from-LAN -- ACCEPT" |
$IPTABLES -A INPUT -i $INTIF -s $SSH_LAN_ADMIN_FROM -d $PRIVATE_IP -p tcp --dport $SSH_LAN -j ACCEPT |
fi |
if [ $SSH_WAN -gt 0 ] |
then |
$IPTABLES -A INPUT -i $EXTIF -s $SSH_WAN_ADMIN_FROM -d $PUBLIC_IP -p tcp --dport $SSH_WAN -m conntrack --ctstate NEW --syn -j NFLOG --nflog-group 2 --nflog-prefix "RULE ssh-from-WAN -- ACCEPT" |
$IPTABLES -A INPUT -i $EXTIF -s $SSH_WAN_ADMIN_FROM -d $PUBLIC_IP -p tcp --dport $SSH_WAN -j ACCEPT |
fi |
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# Insertion de règles locales |
# Here, we add local rules (i.e. VPN from Internet) |
if [ -f /usr/local/etc/alcasar-iptables-local.sh ]; then |
95,23 → 92,16 |
# Drop broadcast & multicast |
$IPTABLES -A INPUT -m addrtype --dst-type BROADCAST,MULTICAST -j DROP |
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# On laisse passer les ICMP echo-request et echo-reply en provenance du LAN |
# Allow ping (icmp N°0 & 8) from LAN |
$IPTABLES -A INPUT -i $INTIF -s $PRIVATE_NETWORK_MASK -p icmp --icmp-type 0 -j ACCEPT |
$IPTABLES -A INPUT -i $INTIF -s $PRIVATE_NETWORK_MASK -p icmp --icmp-type 8 -j ACCEPT |
# On autorise l'accès aux services internes |
# Allow Internal access |
$IPTABLES -A INPUT -i $INTIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p udp --dport domain -j ACCEPT # DNS |
$IPTABLES -A INPUT -i $INTIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport domain -j ACCEPT # DNS |
$IPTABLES -A INPUT -i $INTIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p icmp --icmp-type 8 -j ACCEPT # Réponse ping # ping responce |
$IPTABLES -A INPUT -i $INTIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p icmp --icmp-type 0 -j ACCEPT # Requête ping # ping request |
$IPTABLES -A INPUT -i $INTIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport https -j ACCEPT # ACC |
$IPTABLES -A INPUT -i $INTIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport http -j ACCEPT # ACC |
$IPTABLES -A INPUT -i $INTIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p udp --dport ntp -j ACCEPT # Serveur local de temps # local time server |
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# On autorise les retours de connexions légitimes par FORWARD |
# Conntrack on forward |
$IPTABLES -A FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT |
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# On autorise les demandes de connexions sortantes |
$IPTABLES -A FORWARD -i $INTIF -m state --state NEW -j NFLOG --nflog-group 1 --nflog-prefix "RULE Transfert -- ACCEPT " |
$IPTABLES -A FORWARD -i $INTIF -m state --state NEW -j ACCEPT |
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# On autorise les flux entrant ntp et dns via INTIF |
$IPTABLES -A INPUT -i $INTIF -d $PRIVATE_IP -p udp --dport domain -j ACCEPT |
$IPTABLES -A INPUT -i $INTIF -d $PRIVATE_IP -p udp --dport ntp -j ACCEPT |
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# On autorise le retour des connexions entrante déjà acceptées |
$IPTABLES -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT |
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121,6 → 111,35 |
$IPTABLES -A INPUT -p tcp -j REJECT --reject-with tcp-reset |
$IPTABLES -A INPUT -p udp -j REJECT --reject-with icmp-port-unreachable |
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############################# |
# FORWARD # |
############################# |
# On autorise les retours de connexions légitimes par FORWARD |
# Conntrack on forward |
$IPTABLES -A FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT |
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# Insertion de règles de blocage |
# Here, we add block rules |
if [ -s /usr/local/etc/alcasar-ip-blocked ]; then |
while read ip_line |
do |
ip_on=`echo $ip_line|cut -b1` |
if [ $ip_on != "#" ] |
then |
ip_blocked=`echo $ip_line|cut -d" " -f1` |
$IPTABLES -A FORWARD -d $ip_blocked -j NFLOG --nflog-group 1 --nflog-prefix "RULE IP-blocked -- REJECT " |
$IPTABLES -A FORWARD -d $ip_blocked -j REJECT |
fi |
done < /usr/local/etc/alcasar-ip-blocked |
fi |
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# On autorise les demandes de connexions sortantes |
$IPTABLES -A FORWARD -i $INTIF -m state --state NEW -j NFLOG --nflog-group 1 --nflog-prefix "RULE Transfert -- ACCEPT " |
$IPTABLES -A FORWARD -i $INTIF -m state --state NEW -j ACCEPT |
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############################# |
# POSTROUTING # |
############################# |
# On active le masquage d'adresse par translation (NAT) |
$IPTABLES -A POSTROUTING -t nat -o $EXTIF -j MASQUERADE |
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